Waste elevation disposal structure and additional waste construction method

Abstract

Despite the decrease in suitable areas such as suitable sea areas, this invention provides a waste elevation disposal structure that can increase the volume of waste that can be stored at waste disposal sites while minimizing construction costs. [Solution] A waste elevation disposal structure 1 is provided in which new waste 5 is piled on top of waste 7 stored in an existing waste disposal site 3 equipped with a waterproof barrier 11, and the waste elevation disposal structure 1 comprises new waste 5 of a predetermined thickness provided on top of the waste 7 of the existing waste disposal site 3, an impermeable membrane 21 whose upper portion 29 above the lower end portion 27 covers the side surface of the new waste 5, and a waterproofing material 23 that is in contact with the lower end portion 27 of the impermeable membrane 21 and a predetermined portion of the waterproof barrier 11, and covers the lower end portion 27 of the impermeable membrane 21 and the predetermined portion of the waterproof barrier 11, in order to prevent the new waste 5 and the water contained in the new waste 5 from leaking out of the waterproof barrier 11.

Description

[Technical Field]

[0001] The present invention relates to a waste height-increasing disposal structure and an additional construction method for waste. [Background Art]

[0002] A conventional offshore waste disposal site encloses a predetermined sea area by using a water barrier such as a sheet pile that protrudes upward from a water-impermeable stratum on the seabed, and the enclosed inner space is used as a waste storage site (waste landfill disposal area), and waste is stored in the waste storage site (see Patent Document 1). [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2008-188528 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Meanwhile, commercialization of offshore waste disposal sites is becoming difficult due to the decrease of appropriate sea areas, increase in construction project costs, and the like. Therefore, in waste disposal sites such as offshore waste disposal sites, it is desired to reduce construction project costs as much as possible and increase the volume of waste to be disposed.

[0005] An object of the present invention is to provide a waste height-increasing disposal structure and an additional construction method for waste, which can minimize construction project costs and increase the volume of waste that can be stored in the waste disposal site, even though appropriate areas such as appropriate sea areas are decreasing. [Means for Solving the Problem]

[0006] A waste leveling disposal structure according to an aspect of the present invention is a waste leveling disposal structure in which new waste is leveled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, and the waste leveling disposal structure comprises: waste provided on top of the waste of the existing waste disposal site; an impermeable membrane whose portion above its lower end covers the side surface of the new waste; and a waterproofing material that contacts the lower end of the impermeable membrane with a predetermined portion of the waterproof barrier and covers the lower end of the impermeable membrane with the predetermined portion of the waterproof barrier in order to prevent the new waste, the water contained in the new waste, and the waste of the existing waste disposal site itself from leaking out of the waterproof barrier.

[0007] A waste leveling disposal structure according to an aspect of the present invention is a waste leveling disposal structure in which new waste is leveled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, and comprises: a recess installed at the upper end of the waste of the existing waste disposal site, adjacent to the waterproof barrier or at a location horizontally away from the waterproof barrier; a first dam provided along the recess, on the opposite side of the waterproof barrier with the recess in between, and on top of the waste of the existing waste disposal site; an impermeable membrane whose lower end is inside the recess and whose upper portion covers the side surface of the first dam; a waterproofing material provided inside the recess; and a first new waste of a predetermined thickness provided on top of the waste of the existing waste disposal site, on the opposite side of the waterproof barrier with the first dam in between.

[0008] A waste leveling disposal structure according to an aspect of the present invention is a waste leveling disposal structure in which new waste is leveled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, and the waste leveling structure comprises: a first dam provided along the waterproof barrier and on at least one of the waterproof barrier or the waste of the existing waste disposal site; an impermeable membrane whose lower end is located on the upper surface of the waterproof barrier and whose upper portion covers the side surface of the first dam; a waterproofing material provided on the upper surface of the waterproof barrier so as to cover the lower end of the impermeable membrane; and a first new waste of a predetermined thickness provided on top of the waste of the existing waste disposal site on the side opposite to the waterproof barrier with the first dam in between.

[0009] In the waste elevation and disposal structure according to an aspect of the present invention, the impermeable layer is formed of an existing impermeable membrane that covers a permeable layer and the backfill stones installed on the side of a caisson placed on the permeable layer, and the recess is installed at the upper end of the waste of the existing waste disposal site, adjacent to the existing impermeable membrane, or at a location horizontally away from the existing impermeable membrane.

[0010] A waste leveling and disposal structure according to an aspect of the present invention is a waste leveling and disposal structure in which new waste is leveled on top of waste from an existing waste disposal site where waste is stored inside the second vertical waterproofing, the structure comprising: a caisson; a waterproofing barrier comprising a first vertical waterproofing barrier provided inside the caisson; and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, the structure comprising: a first dam provided along the second vertical waterproofing barrier on the opposite side of the first vertical waterproofing barrier with the second vertical waterproofing barrier in between, on top of the waste from the existing waste disposal site; a filling material filled in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier so as to create a gap at the upper end of the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier; and a lower end extending from the upper end of the second vertical waterproofing barrier to the upper end of the first vertical waterproofing barrier. The waste elevation and disposal structure comprises a waterproof membrane that extends in the direction from the upper end of the second vertical waterproofing wall to a predetermined location midway between the first vertical waterproofing wall and the second vertical waterproofing wall, with the portion above the lower end covering the side surface of the first dam, and a waterproofing material comprising a lower portion and an upper portion provided above the lower portion, wherein the lower portion is filled into the void and in contact with the lower surface of the lower end of the waterproofing membrane, and the upper portion is in contact with the upper surface of the lower end of the waterproofing membrane, thereby covering the lower end of the waterproofing material and a first new waste of a predetermined thickness provided on top of the waste of the existing waste disposal site on the side opposite to the second vertical waterproofing wall with the first dam in between.

[0011] In the waste elevation and disposal structure according to an aspect of the present invention, the impermeable wall comprises a first vertical impermeable wall provided inside a caisson installed on a rubble mound on an impermeable geological layer, and a second vertical impermeable wall provided inside the first vertical impermeable wall, wherein the recess is installed at the upper end of the waste of the existing waste disposal site, adjacent to the second vertical impermeable wall, or at a location horizontally away from the second vertical impermeable wall.

[0012] A waste elevation disposal structure according to an aspect of the present invention is a waste elevation disposal structure in which new waste is piled on top of waste from an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, the structure comprising a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, the structure comprising a first dam provided along the second vertical waterproofing barrier on the opposite side of the first vertical waterproofing barrier with the second vertical waterproofing barrier in between, and on top of the waste from the existing waste disposal site, a filling material filled in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier, and a recess provided at the upper end of the filling material at a location adjacent to the first vertical waterproofing barrier or at a location horizontally away from the first vertical waterproofing barrier, This waste elevation and disposal structure comprises an impermeable membrane whose lower end fits into the recess and whose upper portion covers the side surface of the first dam, a waterproofing material provided in the recess, and a first new waste of a predetermined thickness, which is provided on top of the waste of the existing waste disposal site, on the side opposite to the second vertical waterproofing structure with the first dam in between.

[0013] A waste leveling and disposal structure according to an aspect of the present invention comprises a caisson installed on a rubble mound on an impermeable geological layer, a first backfill stone installed on the side of the caisson opposite to the sea, a first existing impermeable membrane, a second backfill stone installed on the opposite side of the first existing impermeable membrane from the first backfill stone so as to cover the first existing impermeable membrane, the first existing impermeable membrane covers the impermeable geological layer and the first backfill stone, and the second existing impermeable membrane covers the impermeable geological layer and the second backfill stone, thereby forming a waterproof barrier, and new waste is leveled on top of waste stored in an existing waste disposal site, the second existing impermeable membrane The waste elevation and disposal structure comprises: a first dam provided on the opposite side of the first existing impermeable membrane, with the upper end of the second existing impermeable membrane in between, and on top of the waste of the existing waste disposal site; an impermeable membrane whose lower end extends along the upper end of the second existing impermeable membrane, with the portion above the lower end covering the side surface of the first dam; a first waterproofing material provided on top of the second backfill stone, covering the upper end and lower end of the second existing impermeable membrane; a second waterproofing material adjacent to the first waterproofing material, covering the upper end of the first existing impermeable membrane; and a first new waste of a predetermined thickness provided on top of the waste of the existing waste disposal site, on the opposite side of the waterproofing structure with the first dam in between.

[0014] A waste elevation disposal structure according to an aspect of the present invention comprises a caisson installed on a rubble mound on an impermeable geological layer, backfill stones installed on the side of the caisson opposite to the sea, and an existing impermeable membrane covering the impermeable geological layer, the backfill stones, and the portion of the upper surface of the caisson on the backfill stone side, wherein new waste is elevated on top of the waste of an existing waste disposal site where the existing impermeable membrane constitutes a waterproof barrier, and along the backfill stones, on the opposite side of the caisson with the backfill stones in between, The waste elevation disposal structure comprises a first dam installed on top of the waste at an existing waste disposal site, an impermeable membrane whose lower end is located at the upper end of the existing impermeable membrane and whose upper portion covers the side surface of the first dam, a waterproofing material installed on top of the backfill stones and covering the upper end and lower end of the existing impermeable membrane, and a first new waste of a predetermined thickness installed on top of the waste at the existing waste disposal site on the opposite side of the backfill stones with respect to the first dam.

[0015] In the waste elevation and disposal structure according to an embodiment of the present invention, the impermeable material is composed of at least one of the following: an asphalt mixture-based impermeable impermeable material, a soil-based impermeable impermeable material, a chemical-based impermeable impermeable material, or a concrete-based impermeable impermeable material.

[0016] A waste elevation disposal structure according to an aspect of the present invention comprises a second dam provided along the first dam on the opposite side of the impermeable wall with the first dam in between, and on at least one of the first dam or the first new waste, and a second new waste of a predetermined thickness provided on the first new waste in the area opposite to the impermeable wall with the second dam in between, and the upper part of the impermeable membrane covers the side surface of the second dam.

[0017] In the waste elevation and disposal structure according to an aspect of the present invention, the existing waste disposal site is provided with a water retention discharge device that discharges water contained in the waste stored in the existing waste disposal site, and the water contained in the new waste flows down into the waste stored in the existing waste disposal site by gravity.

[0018] A method for adding waste according to an aspect of the present invention is a method for adding new waste to an existing waste disposal site equipped with a waterproof barrier, comprising: a first waste installation step of adding new waste on top of the waste of the existing waste disposal site; an impermeable membrane installation step of installing an impermeable membrane such that the portion above the lower end covers the sides of the new waste added in the first waste installation step; and a waterproof material installation step of installing a waterproof material so as to cover the lower end of the impermeable membrane and a predetermined portion of the waterproof barrier in order to prevent the new waste added in the waste installation step, the water contained in the new waste, and the waste of the existing waste disposal site itself from leaking out of the existing waste disposal site.

[0019] A method for adding waste according to an aspect of the present invention is a method for adding new waste on top of waste stored in an existing waste disposal site, comprising: a recess installation step of installing a recess at the upper end of the waste stored in the existing waste disposal site, adjacent to the vertical impermeable wall of the existing waste disposal site, or at a location horizontally away from the vertical impermeable wall; a first waste installation step of adding the new waste on top of the waste in the existing waste disposal site, on the opposite side of the vertical impermeable wall with the recess installed in the recess installation step in between; an impermeable membrane installation step of installing an impermeable membrane with its lower end positioned within the recess installed in the recess installation step, and extending upward from the lower end to cover the sides of the new waste added in the first waste installation step; and an impermeable material installation step of installing an impermeable material within the recess installed in the recess installation step.

[0020] A waste augmentation method according to an aspect of the present invention is a waste augmentation method for adding new waste on top of waste stored in an existing waste disposal site, comprising: a recess installation step of installing a recess at the upper end of the waste stored in the existing waste disposal site and adjacent to the waterproof barrier of the existing waste disposal site; a first dam installation step of installing a first dam along the recess installed in the recess installation step, on the opposite side of the waterproof barrier with the recess in between, and on top of the waste in the existing waste disposal site; an impermeable membrane lower end installation step of installing the impermeable membrane so that the lower end of the impermeable membrane enters the recess installed in the recess installation step; and in the impermeable membrane lower end installation step of installing the impermeable membrane This method for adding waste comprises: a waterproofing material installation step in which, after installing the lower end of the membrane, a waterproofing material is installed in the recess installed in the recess installation step; a first waterproofing membrane installation step in which, after installing the waterproofing material in the waterproofing material installation step, the portion of the waterproofing membrane above the lower end of the waterproofing membrane is extended upward so as to cover the side of the first dam provided in the first dam installation step, and the waterproofing membrane is installed; and a first waste installation step in which, after installing the waterproofing membrane in the first waterproofing membrane installation step, new waste is added to the waste of the existing waste disposal site on the opposite side of the waterproofing work with the first dam provided in the first dam installation step until a predetermined thickness is reached.

[0021] A method for adding waste according to an aspect of the present invention is a method for adding new waste to waste stored in an existing waste disposal site equipped with a waterproof barrier, and comprises: a first dam installation step of installing a first dam along the waterproof barrier, on at least one of the waterproof barrier or the waste of the existing waste disposal site; a first impermeable membrane installation step of installing an impermeable membrane such that its lower end is located on the upper surface of the waterproof barrier and the portion above the lower end covers the side surface of the first dam installed in the first dam installation step; an impermeable material installation step of installing a waterproofing material on the upper surface of the waterproof barrier so as to cover the lower end of the impermeable membrane installed in the first impermeable membrane installation step; and a first waste installation step of installing a first new waste of a predetermined thickness on the waste of the existing waste disposal site on the opposite side of the waterproof barrier with respect to the first dam installed in the first dam installation step.

[0022] A waste addition method according to an aspect of the present invention is a waste addition method for adding new waste to existing waste in a waste disposal site where waste is stored inside the second vertical waterproofing barrier, which comprises a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, wherein new waste is added along the second vertical waterproofing barrier, with the first vertical waterproofing barrier in between. A first dam installation step involves installing a first dam on the opposite side of the vertical impermeable wall, over the waste of the existing waste disposal site; a void formation step involves forming a void at the upper end of the filler material provided in the space between the first vertical impermeable wall and the second vertical impermeable wall; and the lower end is located in the direction from the upper end of the second vertical impermeable wall toward the upper end of the first vertical impermeable wall, between the upper end of the second vertical impermeable wall and the intermediate space between the first vertical impermeable wall and the second vertical impermeable wall. The method for adding waste comprises: a first impermeable membrane installation step, which involves installing an impermeable membrane that extends to a predetermined location and has a portion above the lower end that covers the side surface of the first dam provided in the first dam installation step; an impermeable material installation step, which involves installing an impermeable material comprising a lower portion and an upper portion provided above the lower portion, wherein the lower portion is filled into the void and in contact with the lower surface of the lower end of the impermeable membrane, and the upper portion is in contact with the upper surface of the lower end of the impermeable membrane, covering the lower end of the impermeable membrane; and a first waste installation step, which involves installing a first new waste of a predetermined thickness on top of the waste of the existing waste disposal site in the area opposite to the second vertical impermeable structure with the first dam provided in the first dam installation step in between.

[0023] A waste addition method according to an aspect of the present invention is a waste addition method for adding new waste to an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, which comprises a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, the method comprising: a first dam installation step of providing a first dam along the second vertical waterproofing barrier, on the opposite side of the first vertical waterproofing barrier with the second vertical waterproofing barrier in between, and on the waste of the existing waste disposal site; and the upper end of a filler material provided in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier, which is adjacent to the first vertical waterproofing barrier. The waste augmentation method comprises: a recess installation step of creating a recess in an adjacent location or a location horizontally away from the first vertical waterproofing structure; a first waterproofing membrane installation step of installing an impermeable membrane such that its lower end fits into the recess installed in the recess installation step and the portion above the lower end covers the side of the first dam installed in the first dam installation step; a waterproofing material installation step of installing a waterproofing material in the recess installed in the recess installation step; and a first waste installation step of installing a first new waste of a predetermined thickness on top of the waste of the existing waste disposal site in a location opposite to the second vertical waterproofing structure with the first dam installed in the first dam installation step in between.

[0024] A waste additional disposal method according to an aspect of the present invention is a waste additional disposal method for adding new waste onto waste stored in an existing waste disposal site where a seepage control work is formed, the existing waste disposal site comprising: a caisson installed on an impermeable stratum; a first backfill stone installed on a side surface of the caisson opposite to the sea; a first existing impermeable membrane; a second backfill stone installed on a side of the first existing impermeable membrane opposite to the first backfill stone so as to cover the first existing impermeable membrane; and a second existing impermeable membrane, wherein the first existing impermeable membrane covers the impermeable stratum and the first backfill stone, and the second existing impermeable membrane covers the impermeable stratum and the second backfill stone, the waste additional disposal method comprising: a first embankment installation step of installing a first embankment along the second existing impermeable membrane, on a side opposite to the first existing impermeable membrane with an upper end portion of the second existing impermeable membrane interposed therebetween, and on the waste of the existing waste disposal site; a first impermeable membrane installation step of installing an impermeable membrane such that a lower end portion of the impermeable membrane extends along the upper end portion of the second existing impermeable membrane, and a portion above the lower end portion covers a side surface of the first embankment installed in the first embankment installation step; a first impermeable material installation step of installing a first impermeable material on the second backfill stone so as to cover the upper end portion of the second existing impermeable membrane and the lower end portion of the impermeable membrane installed in the first impermeable membrane installation step; a second impermeable material installation step of installing a second impermeable material adjacent to the first impermeable material installed in the first impermeable material installation step so as to cover an upper end portion of the first existing impermeable membrane; and a first new waste installation step of installing first new waste having a predetermined thickness on the waste of the existing waste disposal site at a site opposite to the seepage control work with the first embankment interposed therebetween.

[0025] A waste addition method according to an aspect of the present invention comprises a caisson installed on an impermeable geological layer, backfill stones installed on the side of the caisson opposite to the sea, and an existing impermeable membrane covering the impermeable geological layer, the backfill stones, and the portion of the upper surface of the caisson that is on the backfill stone side, wherein the existing impermeable membrane constitutes a waterproof barrier, and the method for adding new waste to an existing waste disposal site comprises a first dam installation step of installing a first dam along the backfill stones, on the opposite side of the caisson with the backfill stones in between, on top of the waste of the existing waste disposal site, and the lower end of the upper end of the existing impermeable membrane This method for adding waste comprises: a first impermeable membrane installation step, in which an impermeable membrane is installed at the location and the portion above the lower end covers the side surface of the first dam installed in the first dam installation step; a waterproofing material installation step, in which a waterproofing material is installed on the backfill stones and covers the upper end of the existing impermeable membrane and the lower end of the impermeable membrane installed in the first impermeable membrane installation step; and a first new waste step, in which a first new waste of a predetermined thickness is installed on the portion opposite to the backfill stones with the first dam installed in the first dam installation step in between, on top of the waste of the existing waste disposal site.

[0026] A waste additional processing method according to an aspect of the present invention comprises, after adding new waste in the first waste placing step, along the first dam provided in the first dam placing step, on at least one of the first dam provided in the first dam placing step and the new waste added in the first waste placing step, a second dam placing step of placing a second dam; after placing the second dam in the second dam placing step, so as to cover a side surface of the second dam provided in the second dam placing step, a second impermeable membrane placing step of extending an upper portion of the impermeable membrane further upward and placing the impermeable membrane; and after placing the impermeable membrane in the second impermeable membrane placing step, on the new waste added in the first waste placing step at a site opposite to the seepage control work with the second dam provided in the second dam placing step interposed therebetween, a second waste placing step of adding the new waste until a predetermined thickness is obtained.

[0027] In the waste additional processing method according to an aspect of the present invention, before the upper portion of the impermeable membrane is extended upward in the second impermeable membrane placing step, the upper portion of the impermeable membrane is wound into a roll.

[0028] In the waste additional processing method according to an aspect of the present invention, when placing the impermeable membrane in the second impermeable membrane placing step, the impermeable membrane provided in the first impermeable membrane placing step and the impermeable membrane provided in the second impermeable membrane placing step are joined to each other. Effects of the Invention

[0029] According to the present invention, even though appropriate areas such as appropriate sea areas are decreasing, it is possible to minimize construction project costs and increase the volume of waste that can be stored at a waste disposal site. Brief Description of the Drawings

[0030] [Figure 1](a) is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to the first embodiment of the present invention, (b) is an enlarged view of the IB section in (a), and (c) is a figure corresponding to (b), in which the shape of the lower end of the impermeable membrane has been modified. [Figure 2] This figure corresponds to Figure 1 and shows a method for adding waste in a waste elevation and disposal structure according to the first embodiment of the present invention. [Figure 3] This figure corresponds to Figure 1 and shows a method for adding waste in a waste elevation and disposal structure according to the first embodiment of the present invention. [Figure 4] This figure corresponds to Figure 1 and shows a method for adding waste in a waste elevation and disposal structure according to the first embodiment of the present invention. [Figure 5] This is an enlarged view of section V in Figure 3(b). [Figure 6] This figure shows an impermeable membrane used in a waste elevation and disposal structure according to the first embodiment of the present invention, where (a) is a figure showing an impermeable membrane with a single layer of waterproof sheeting, and (b) is a figure showing an impermeable membrane with a double layer of waterproof sheeting. [Figure 7] This figure corresponds to Figure 1 and shows a method for adding waste when an impermeable membrane is connected to and added in the waste elevation and disposal structure according to the first embodiment of the present invention. [Figure 8] (a) is an enlarged view of section VIIIA in Figure 7(b), and (b) is a figure corresponding to (a), showing a modified example of the connection method of the impermeable membrane. [Figure 9] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to a second embodiment of the present invention. [Figure 10] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to a third embodiment of the present invention. [Figure 11] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to a fourth embodiment of the present invention. [Figure 12]This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to a fifth embodiment of the present invention. [Figure 13] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to the sixth embodiment of the present invention. [Figure 14] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to the seventh embodiment of the present invention. [Figure 15] (a) is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to the eighth embodiment of the present invention, (b) is an enlarged view of the XVB portion in (a), and (c) is a figure corresponding to (b), in which the shape of the lower end of the impermeable membrane has been modified. [Figure 16] This is a cross-sectional view showing the schematic configuration of a waste elevation and disposal structure according to the ninth embodiment of the present invention. [Figure 17] This figure is equivalent to Figure 1(a), but with the position of the recess and other elements changed. [Figure 18] This figure is equivalent to Figure 11, but with changes to the position of the recessed area, etc. [Modes for carrying out the invention]

[0031] [First Embodiment] As shown in Figure 1, the waste elevation disposal structure 1 according to the first embodiment of the present invention is one in which new waste 5 is stored on top of waste 7 stored in an existing waste disposal site (for example, an existing offshore waste disposal site) 3, with the waste being raised on top of the existing waste.

[0032] The existing waste disposal site 3 is equipped with, for example, a waterproof barrier (vertical waterproof barrier) 11 rising from an impermeable geological layer (impermeable layer) 9. The impermeable geological layer 9 is, for example, an impermeable geological layer on the seabed. The area inside the vertical waterproof barrier 11 in a plan view (the area enclosed by the vertical waterproof barrier 11; the opposite side of the sea 40 with the vertical waterproof barrier 11 in between) and above the impermeable geological layer 9 is the waste storage area 13.

[0033] In the existing waste disposal site 3, waste 7 is stored in the storage area 13, and the storage area 13 is filled with waste 7. In the existing waste disposal site 3, a layered cover soil 15 is provided on top of the waste (existing waste) 7 stored in the storage area 13. The waste 7 stored in the storage area 13 is covered with the layered cover soil 15. Furthermore, the position of the upper end of the vertical waterproof barrier 11 and the position of the upper surface of the cover soil 15 are approximately the same.

[0034] The waste elevation and disposal structure 1 according to the first embodiment of the present invention comprises a recess 17, a first dam 19, an impermeable membrane (impermeable sheet) 21, a watertight material 23, a first new waste 5 (5A), and new covering soil 25 (25A).

[0035] The recess 17 is located at the upper end of the waste (existing waste 7 and existing cover soil 15) stored in the existing waste disposal site 3, adjacent to the vertical waterproof barrier 11. The recess 17 is formed, for example, by removing a portion of the waste 7 from the existing waste disposal site 3 and a portion of the cover soil 15 on top of the existing waste 7. The removed waste 7 and cover soil 15 are then stored, for example, as new waste 5.

[0036] Furthermore, the recess 17 may be located at the upper end of the existing waste 7 and existing cover soil 15 stored in the existing waste disposal site 3, as shown in Figure 17, and slightly away from the vertical waterproofing barrier 11.

[0037] The first dam 19 is located along the recess 17, on the opposite side of the vertical impermeable wall 11 with the recess 17 in between (the part inside the recess 17 in a plan view; the part enclosed by the recess 17 in a plan view), and is built on top of existing waste 7 (existing cover soil 15).

[0038] The impermeable membrane 21 has its lower end 27 inside the recess 17, and the portion 29 above the lower end 27 covers the side of the first dam 19 (for example, the entire side facing the vertical impermeable wall 11). Furthermore, the entire lower surface in the thickness direction of the impermeable membrane 21 (lower end 27) inside the recess 17 is in contact with the existing waste 7 and existing cover soil 15 inside the recess 17.

[0039] The waterproofing material 23 is installed within the recess 17. The entire recess 17 is filled with the waterproofing material 23, and the entire surface of the lower end 27 of the impermeable membrane 21 located within the recess 17, except for the lower surface, is in contact with the waterproofing material 23. More specifically, the entire lower end 27 of the impermeable membrane 21 located within the recess 17 is covered in contact with the existing waste 7, the existing cover soil 15, and the waterproofing material 23.

[0040] The first new waste 5(5A) is located on the side opposite to the vertical impermeable wall 11 with the first dam 19 in between (the area inside the first dam 19 in a plan view; the area enclosed by the first dam 19 in a plan view). The first new waste 5A is also located on top of the existing waste 7 (existing cover soil 15) to a predetermined thickness. The position of the upper surface of the cover soil 25(25A) of a predetermined thickness covering the first new waste 5A and the position of the upper end of the first dam 19 are approximately coincidental in the vertical direction.

[0041] Furthermore, the waste elevation and disposal structure 1 is further comprised of a second dam 31 and a second new waste 5 (5B). The second dam 31 is located along the first dam 19, on the opposite side of the recess 17 (impermeable structure 11) with the first dam 19 in between.

[0042] The second dam 31 is installed on top of at least one of the first dam 19 or the first new waste 5A (covering soil 25A). In the configuration shown in Figure 1, the second dam 31 is installed on top of the first dam 19 and the new waste 5A (new covering soil 25A). Furthermore, in the vertical direction, the upper surface of the covering soil 25A of a predetermined thickness covering the second new waste 5A and the upper end of the second dam 31 coincide with each other.

[0043] Furthermore, in Figure 1, only one set of second dams 31 and second new waste 5B is provided on top of the first dam 19 and first new waste 5A. However, multiple sets of second dams 31 and second new waste 5B may be provided on top of the first dam 19 and first new waste 5A. In other words, the second dams 31 and second new waste 5B (cover soil 25B) may consist of not just one layer, but two or more layers.

[0044] For example, in addition to the first layer of the second dam 31 and the second new waste 5B (covering soil 25B) shown in Figure 1, a second layer of the second dam 31 and the second new waste 5B (covering soil 25B) may be further provided, although this is not shown in the figure.

[0045] By the way, although a plan view of the waste elevation disposal structure 1 (existing waste disposal site 3) is not shown, the vertical waterproofing wall 11 of the existing waste disposal site 3 is formed in a rectangular ring shape ("square" shape) in plan view. In this embodiment, the storage area 13 of the existing waste disposal site 3 is formed in a rectangular parallelepiped shape (square prism shape).

[0046] The first dam 19 is also located inside the vertical impermeable wall 11 in a plan view and is formed, for example, in a rectangular ring shape ("square" shape). The first dam 19 and the first new waste 5A (the three-dimensional shape of the first dam 19, the first new waste 5A, and the cover soil 25A combined) are formed, for example, in a truncated square pyramid shape.

[0047] As already understood, the first dam 19 and the first new waste 5A (cover soil 25A) rest on the existing waste 7 (cover soil 15). In plan view, the truncated pyramidal first dam 19 and the first new waste 5A (cover soil 25A) overlap the inner portion of the recess 17 on the upper surface of the existing waste 7 (cover soil 15). Furthermore, in plan view, a rectangular, ring-shaped ("square") impermeable material 23 is located inside the vertical impermeable wall 11, and the first dam 19 and the first new waste 5A (cover soil 25A) are located inside the impermeable material 23.

[0048] Furthermore, the second dam 31 is also located inside the first dam 19 in a plan view and is formed in a rectangular ring shape ("square" shape). The second dam 31 and the second new waste 5B (cover soil 25B) are also formed in a truncated square pyramidal shape and rest on the first new waste 5A (cover soil 25A) and the first dam 19.

[0049] The first dam 19, the first new waste 5A (covering soil 25A), the second dam 31, and the second new waste 5B (covering soil 25B) combined are also formed in the shape of a truncated square pyramid.

[0050] Furthermore, the existing waste disposal site 3 (waste elevation disposal structure 1) is equipped with a retained water discharge device 33, as shown in Figure 1. The retained water discharge device 33 consists of a pump 35 and piping 37. The retained water discharge device 33 is designed to discharge the retained water from the waste 7 stored in the existing waste disposal site 3. As a result, the height of the liquid level (top surface) of the retained water is positioned below the upper end of the waterproof barrier 11 in the vertical direction. Note that in the diagrams showing waste elevation disposal structures other than the waste elevation disposal structure 1 according to the first embodiment (Figures 9, 10, etc.), the retained water discharge device 33 is not shown.

[0051] In the waste elevation and disposal structure 1, the water contained in the new waste 5 flows down by gravity into the waste 7 stored in the existing waste disposal site 3. Then, the water contained in the new waste 5 is discharged by the water discharge device 33.

[0052] The waste elevation disposal structure 1 will be explained in more detail. In Figure 1, the reference numeral 39 indicates the sea surface of the sea 40. The upper end (top surface) of the waste 7 of the existing waste disposal site 3, the upper end (top surface) of the soil covering 15 of the waste 7, the upper end of the vertical impermeable wall 11, the upper end (top surface) of the impermeable material 23, and the lower end (bottom surface) of the first dam 19 are located above the sea surface 39.

[0053] As the vertical impermeable wall 11, for example, steel sheet piles (steel sheet piles, steel pipe sheet piles, H-shaped sheet piles, box-shaped sheet piles), underground walls, injected solidified walls, and sheets with impermeable function are used. The lower end of the vertical impermeable wall 11 penetrates into the impermeable soil layer 9. The vertical impermeable wall 11 is composed of multiple steel sheet piles, etc., arranged in a direction perpendicular to the plane of Figure 1, and extends in a direction perpendicular to the plane of Figure 1.

[0054] The cross-sectional shape of the recess 17 (waterproofing material 23) is a trapezoidal shape with two corners that are almost right angles. The width dimension W1 of the upper surface of the recess 17 (waterproofing material 23) is greater than the width dimension W2 of the lower surface of the recess 17 (waterproofing material 23), for example, about twice as much. The height dimension H1 of the recess 17 (waterproofing material 23) is greater than the width dimension W2 of the lower surface of the recess 17 (waterproofing material 23) and less than the width dimension W1, for example, about 1.5 times the width dimension W2. Furthermore, the width dimension W1 is about 2m, the width dimension W2 is about 1m, and the height dimension H1 is about 1.5m.

[0055] As the waterproofing material (connecting waterproofing material) 23, an asphalt mixture-based waterproofing material (mastic asphalt), a soil-based waterproofing material, a chemical-based waterproofing material, or a concrete-based waterproofing material is used. A mixture of the above may also be used as the waterproofing material 23. That is, the waterproofing material 23 may be composed of at least one of the asphalt mixture-based waterproofing material, a soil-based waterproofing material, a chemical-based waterproofing material, or a concrete-based waterproofing material, or a composite thereof. The recess 17 (waterproofing material 23) also extends in a direction perpendicular to the plane of the paper in Figure 1.

[0056] The cross-sectional shape of the first dam 19 is, for example, an isosceles trapezoid shape, and the first dam 19 is constructed of stone masonry, concrete, blocks, soil, etc. The first dam 19 is built on top of the cover soil 15 of the waste 7 of the existing waste disposal site 3. The first dam 19 is also built on the opposite side of the vertical impermeable wall 11 with the recess 17 (impermeable material 23) in between, and is, for example, adjacent to the recess 17 (impermeable material 23). The first dam 19 also extends in a direction perpendicular to the plane of the paper in Figure 1. The new waste 5A and the cover soil 25A are built on top of the cover soil 15 on the opposite side of the recess 17 (impermeable material 23) with the first dam 19 in between.

[0057] The cross-sectional shape of the second dam 31 is also an isosceles trapezoid shape, similar to the cross-sectional shape of the first dam 19, and is constructed of stone masonry, concrete, blocks, soil, etc. The second dam 31 is built on top of the first dam 19, new waste 5A, and cover soil 25A. More specifically, the part of the second dam 31 on the side of the recess 17 (impermeable material 23) rests on top of the first dam 19, and the part of the second dam 31 opposite the recess 17 (impermeable material 23) rests on top of the new waste 5A and cover soil 25A.

[0058] The second dam 31 also extends in a direction perpendicular to the plane of the paper in Figure 1. The new waste 5B and cover soil 25B are placed on top of the cover soil 25A on the opposite side of the recess 17 (impermeable material 23) with the second dam 31 in between.

[0059] The degree of inclination of the slope 41 of the waste 7 and cover soil 15 of the existing waste disposal site 3 in the recess 17, the degree of inclination of the slope 43 of the first dam 19, and the degree of inclination of the slope 45 of the second dam 31 are approximately the same. However, these degrees of inclination may differ from each other.

[0060] The water-impermeable membrane 21 is composed of a first portion 47, a second portion 49, a third portion 51, a fourth portion 53, a fifth portion 55, and a sixth portion 57. The first portion 47 and the second portion 49 form the lower end portion 27 described above, and the third portion 51, the fourth portion 53, the fifth portion 55, and the sixth portion 57 form the upper portion 29 described above.

[0061] The first part 47 is located within the recess 17 (impermeable material 23) and covers the existing waste 7 on the bottom surface 59 of the recess 17. The second part 49 is also located within the recess 17 (impermeable material 23) and covers the existing waste 7 (covering soil 15) on the slope 41 of the recess 17. The third part 51 extends from the impermeable material 23 on the upper side of the recess 17 (impermeable material 23) and covers the slope 43 of the first dam 19.

[0062] The fourth section 53 covers the slope 45 of the second dam 31. The fifth section 55 covers the top surface 61 of the second dam 31. The sixth section 57 covers the slope 62 of the second dam 31. Slope 62 is the slope opposite to slope 45, with top surface 61 in between. Also, the sixth section 57 is located within the new waste 5B and cover soil 25B and is covered by the new waste 5B and cover soil 25B.

[0063] As shown in Figure 1(b), watertight sealing is achieved at the points (surfaces) where the impermeable material 23 and the first portion 47 and second portion 49 of the impermeable membrane 21 are in contact with each other. Furthermore, watertight sealing is achieved at the points (surfaces) where the impermeable material 23 and the vertical impermeable structure 11 are in contact with each other. As a result, the water contained in the waste 7 and the new waste 5 and the waste itself from the existing waste disposal site are blocked by the impermeable material 23, so that even if the liquid level of the contained water rises, the contained water and the waste itself from the existing waste disposal site do not leak out of the waste elevation disposal structure 1 (towards the sea 40).

[0064] Let's assume that the water contained in waste 7 and the new waste 5 are at the same height as the top surface of the new waste 5A, and that no waterproofing material 23 is provided. In that case, the water contained in the existing waste 7 and the waste itself from the existing waste disposal site will seep into the recess 17 from the upper surface portion 60 (the portion of the bottom surface 59 of the recess 17 where the impermeable membrane 21 is not present), and eventually overflow the waterproofing barrier 11 and into the sea 40.

[0065] However, the presence of the impermeable material 23 prevents the retained water and the waste itself from the existing waste disposal site from overflowing the impermeable structure 11 and spilling into the sea 40. Furthermore, since the new waste 5 is stored inside the first dam 19 and the second dam 31, which are covered with an impermeable membrane 21, the retained water and the waste itself from the existing waste disposal site are prevented from overflowing into the sea 40 through the first dam 19 and the second dam 31. In addition, the presence of the first dam 19 and the second dam 31 prevents the new waste 5 from collapsing and spilling into the sea 40.

[0066] As shown in Figure 1(c), the first portion 47 of the lower end 27 of the impermeable membrane 21 may be removed. In Figure 1(c), a part of the second portion 49 (the lower end) of the lower end 27 of the impermeable membrane 21 is also removed, but the lower end of the second portion 49 may also be left intact.

[0067] Here, the structure of the impermeable membrane 21 will be explained in more detail with reference to Figure 6(a). The impermeable membrane 21 has appropriate flexibility. In the impermeable membrane 21, sheet-like protective mats 65 are provided on both sides of the sheet-like waterproofing sheet 63 in the thickness direction. That is, in the impermeable membrane 21, the protective mat 65, waterproofing sheet 63, and protective mat 65 are stacked in this order in the thickness direction, resulting in a three-layer structure.

[0068] Furthermore, as shown in Figure 6(b), a five-layer structure consisting of a protective mat 65, a waterproof sheet 63, a protective mat 65, a waterproof sheet 63, and a protective mat 65 is sometimes used as the water-impermeable membrane 21. This five-layer water-impermeable membrane 21 is used, for example, in the waste elevation and disposal structure 1h according to the ninth embodiment shown in Figure 16.

[0069] Furthermore, it is desirable to adopt a three-layer structure as shown in Figure 6(a) as the impermeable membrane 21, including its use in the waste elevation disposal structure 1h. This is because the three-layer membrane 21 shown in Figure 6(a) is less expensive than the five-layer membrane 21 shown in Figure 6(b). Also, the three-layer impermeable membrane 21 is installed on top of the existing waste disposal site 3, and its condition can be easily visually inspected. Furthermore, if the three-layer impermeable membrane 21 is damaged, the damaged area can be easily detected and repaired with the naked eye. In addition, a three-layer membrane 21 as shown in Figure 6(a) may be adopted as the impermeable membrane 21 in which at least one of the protective mats 65 covering both sides in the thickness direction of the waterproof sheet 63 has been removed. For example, the impermeable membrane 21 may consist only of the waterproof sheet 63.

[0070] Furthermore, the weirs 19 and 31 may be removed in the waste elevation and disposal structure 1. In this case, new waste will be provided in place of the weirs. The removal of the weirs 19 and 31 may also be carried out in waste elevation and disposal structures other than the waste elevation and disposal structure 1 according to the first embodiment (see Figures 9, 10, etc.).

[0071] Next, the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1 will be explained with reference to Figures 2 to 5.

[0072] The waste addition method is a method of adding new waste 5 (new waste different from the waste 7 in the existing waste disposal site 3) on top of the existing waste disposal site 3 (see Figure 2(a)) (raising the level and storing it). The waste addition method consists of a recess installation process, a first dam installation process, an impermeable membrane lower end installation process, a watertight material installation process, a first impermeable membrane installation process, and a first waste installation process (first waste addition process).

[0073] In the recess installation process, a recess 17 is created at the upper end of the waste 7 (existing cover soil 15) stored in the existing waste disposal site 3. The recess 17 is installed either adjacent to the vertical impermeable wall 11 of the existing waste disposal site 3, as shown in Figure 2(b), or horizontally away from the vertical impermeable wall 11, as shown in Figure 17. Figure 2(a) shows the existing waste disposal site 3 without the recess 17 installed.

[0074] In the first dam installation process, the first dam 19 is constructed along the recess 17 installed in the recess installation process (see Figure 3(a)). The first dam 19 is located on the opposite side of the vertical impermeable wall 11 with the recess 17 in between, and is constructed on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0075] In the impermeable membrane lower end installation process, the impermeable membrane 21 is installed so that its lower end 27 is placed inside the recess 17 installed in the recess installation process. When the lower end 27 of the impermeable membrane 21 has been installed in the impermeable membrane lower end installation process, the entire lower surface of the lower end 27 in the thickness direction is in contact with the existing waste 7 and existing cover soil 15 inside the recess 17 (see Figure 3(b)).

[0076] In the waterproofing material installation process, after installing the lower end 27 of the impermeable membrane 21 in the impermeable membrane lower end installation process, the waterproofing material 23 is placed in the recess 17 installed in the recess installation process. The waterproofing material installation process fills the entire recess 17 with the waterproofing material 23, so that the entire upper surface in the thickness direction of the lower end 27 of the impermeable membrane 21 inside the recess 17 comes into contact with the waterproofing material 23. In other words, the waterproofing material installation process ensures that the entire lower end 27 of the impermeable membrane 21 inside the recess 17 comes into contact with the existing waste 7, the existing cover soil 15, and the waterproofing material 23.

[0077] In the first installation process of the impermeable membrane, after the waterproofing material 23 is installed in the waterproofing material installation process, the impermeable membrane 21 is installed so as to cover the side surface 43 (the entire surface of the slope 43) of the first dam 19 that was constructed in the first dam installation process (see Figure 3(b)). The impermeable membrane 21 is installed by extending the portion 29 above the lower end 27 of the impermeable membrane 21 diagonally upward (unfolding it).

[0078] In the first waste installation process, after installing the impermeable membrane 21 in the first impermeable membrane installation process, new waste 5A is added on top of the existing waste 7 (existing cover soil 15) until it reaches a predetermined thickness (see Figure 4(a)). The addition of the new waste 5A is carried out on the side opposite to the vertical impermeable wall 11, which is separated by the first dam 19 installed in the first dam installation process.

[0079] After the addition of new waste 5A is completed in the first waste installation process, the cover soil installation process involves installing new cover soil 25A of a predetermined thickness on top of the new waste 5A, so that the new waste 5A is covered with the new cover soil 25A. The position of the upper end of the new cover soil 25A in the vertical direction is approximately the same as the position of the upper end of the first dam 19 (see Figure 4(a)).

[0080] In the additional waste construction method, the first dam construction process is performed after the recess installation process, and the impermeable membrane lower end installation process is performed after the first dam installation process. Furthermore, in the additional waste construction method, the impermeable membrane lower end installation process is performed after the impermeable membrane lower end installation process, and the impermeable membrane first installation process is performed after the impermeable membrane installation process. In addition, in the additional waste construction method, the first waste installation process is performed after the impermeable membrane first installation process.

[0081] Furthermore, in the additional waste disposal method, the execution order of each process may be appropriately changed, such as by swapping the execution order of the recess installation process and the first dam installation process.

[0082] Furthermore, the waste addition method comprises a second dam installation process, a second impermeable membrane installation process, and a second waste installation process (second waste addition process).

[0083] The second dam construction process is performed after the addition of new waste 5A in the first waste installation process and the addition of new cover soil 25A in the cover soil installation process. In the second dam construction process, a second dam 31 is constructed, which is a separate dam from the dam 19 constructed in the first dam construction process. The second dam 31 is constructed along the first dam 19 constructed in the first dam construction process. Furthermore, the second dam 31 is constructed on top of at least one of the first dam 19 constructed in the first dam construction process or the new waste 5A (new cover soil 25A) added in the first waste installation process (see Figure 4(b)). In Figure 4(b), the second dam 31 is constructed on top of both the first dam 19 and the new waste 5A.

[0084] The installation process for the second impermeable membrane is carried out after the second dam 31 has been constructed in the second dam construction process. In the installation process for the second impermeable membrane, the impermeable membrane 21 is installed so as to cover the side surface 45 (the entire slope) of the second dam 31 that was constructed in the second dam construction process. Furthermore, in the installation process for the second impermeable membrane, the upper part 29 of the impermeable membrane 21 is extended further upward from the first dam 19 that was constructed in the first dam construction process, and the impermeable membrane 21 is installed in this manner.

[0085] The second waste installation process is performed after the installation of the second impermeable membrane 21. In the second waste installation process, new waste 5B is added on top of the new waste 5A (new cover soil 25A) added in the first waste installation process until it reaches a predetermined thickness. In addition, the second waste installation process adds new waste 5B to the part opposite the vertical impermeable wall 11, which is separated by the second dam 31 installed in the second dam installation process.

[0086] Furthermore, after the addition of new waste 5B in the second waste installation process, the cover soil installation process installs new cover soil 25B of a predetermined thickness on top of the new waste 5B to cover it. The position of the upper end of the new cover soil 25B installed in the cover soil installation process in the vertical direction is approximately the same as the position of the upper end of the second dam 31.

[0087] The second dam installation process, the second impermeable membrane installation process, and the second waste installation process (covering soil installation process) are to be carried out in this order, and are to be repeated once or multiple times.

[0088] The following describes a configuration in which the second dam installation process, the second impermeable membrane installation process, and the second waste installation process (covering process) are performed twice in this order. First, the first second dam installation process is performed after the first waste installation process (covering process). Subsequently, the first second impermeable membrane installation process is performed after the first second dam installation process, and the first second waste installation process (covering process) is performed after the first second impermeable membrane installation process. Subsequently, the second second dam installation process is performed after the first second waste installation process. Subsequently, the second impermeable membrane installation process is performed after the second second dam installation process, and the second second waste installation process (covering process) is performed after the second second impermeable membrane installation process.

[0089] Furthermore, in the installation process of the second water-impermeable membrane, before the upper portion 29 of the water-impermeable membrane 21 is extended upward, the upper portion 29 of the water-impermeable membrane 21 is wound into a roll (see Figures 4(a) and 5).

[0090] In the installation process for the second impermeable membrane, the upper portion 29 of the impermeable membrane 21, which is wound in a roll, is rolled diagonally upward along the slope 45 of the second dam 31. This unfolds the upper portion 29 of the impermeable membrane 21. In the state shown in Figures 4(a) and 5, the upper portion 29 of the impermeable membrane 21, which is wound in a roll, is held in place by a holder (not shown).

[0091] In the installation process of the second impermeable membrane, before extending the upper portion 29 of the impermeable membrane 21 upwards, the upper portion 29 of the impermeable membrane 21 is rolled up. This allows new waste 5 to be stacked and stored in multiple batches without having to connect the impermeable membrane 21 in the middle.

[0092] As shown in Figure 7, the impermeable membranes 21 may be joined together in the middle. Alternatively, the impermeable membrane 21(21A) may be installed in the installation step of the first impermeable membrane, and then the impermeable membrane 21(21B) may be installed in the installation step of the second impermeable membrane. The impermeable membranes 21A and 21B are separate entities after the installation step of the first impermeable membrane but before the installation step of the second impermeable membrane.

[0093] In the installation process of the second impermeable membrane, when the impermeable membrane 21B is installed, the impermeable membrane 21A and the impermeable membrane 21B are joined to each other in an airtight (waterproof) manner.

[0094] The installation process for the first impermeable membrane involves installing the impermeable membrane 21A so as to cover the entire surface of the side surface 43 of the first dam 19. The upper end of the impermeable membrane 21A installed in the installation process for the first impermeable membrane is located at the upper end of the first dam 19.

[0095] In the installation process of the second impermeable membrane, the lower end of the impermeable membrane 21B is joined to the upper end of the impermeable membrane 21A. The installation process of the second impermeable membrane involves installing the impermeable membrane 21B so as to cover the entire surface of the side surface 45 of the second dam 31. Furthermore, the upper end of the impermeable membrane 21B installed in the installation process of the second impermeable membrane is located at the upper end of the second dam 31.

[0096] To explain further, the impermeable membrane 21B covers the upper surface 61 of the second dam 31 and the side surface 57 opposite to the side surface 45.

[0097] Here, the manner in which the impermeable membrane 21A and the impermeable membrane 21B are joined will be explained with reference to Figure 8. The impermeable membrane 21A and the impermeable membrane 21B are joined by removing the protective mat 65 as appropriate and directly joining the impermeable sheets 63 to each other. The joining of the impermeable sheets 63 to each other can be done by adhesive joining, direct joining such as heat welding using a hot plate press, or indirect joining using mastic asphalt. Furthermore, chemical, concrete, and soil-based materials can be used for indirect joining. Figure 8(a) shows the joining state of section VIIIA shown in Figure 7(b). Figure 8(b) shows the joining state of the impermeable membrane 21A and the impermeable membrane 21B in a configuration in which the impermeable membrane 21B does not cover the upper surface of the first dam 19.

[0098] In this way, when installing the impermeable membrane 21B, the impermeable membrane 21B is bonded to the impermeable membrane 21A, so that an impermeable membrane 21 can be added as needed each time new waste 5 is piled up. This allows new waste 5 to be piled up and stored in multiple batches.

[0099] The waste elevation and disposal structure 1 comprises an impermeable membrane 21 whose lower end portion 27 is located within a recess 17 and whose upper portion 29 covers the sides 43 and 45 of the first dam 19, and a watertight material 23 provided within the recess 17. The waste elevation and disposal structure 1 also comprises a first new waste 5A of a predetermined thickness, located inside the first dam 19 and placed on top of the waste 7 of the existing waste disposal site 3.

[0100] This makes it possible to properly install new waste 5 on top of the existing waste 7 in waste disposal site 3. Furthermore, despite the decrease in suitable areas such as suitable sea areas, it is possible to increase the volume of waste 5 and 7 that can be stored in the existing waste disposal site 3 while keeping construction costs to a minimum.

[0101] Furthermore, in the waste elevation disposal structure 1, the second new waste 5B is located inside the second dam 31 and is situated on top of the first new waste 5A. This further increases the volume of new waste 5 that can be stored in the existing waste disposal site 3.

[0102] Furthermore, the waste elevation disposal structure 1 is equipped with a water retention discharge device 33 that discharges the water contained in the waste 7 stored in the existing waste disposal site 3. The water contained in the new waste 5 is then allowed to flow down to the waste 7 in the existing waste disposal site 3 by gravity. The water retention discharge device 33 is installed when the existing waste disposal site 3 is set up (before the new waste 5A is provided). As a result, the water contained in the new waste 5 can be discharged using the existing water retention discharge device 33 without the need to install a new water retention discharge device.

[0103] [Second Embodiment] A waste elevation and disposal structure 1a according to a second embodiment of the present invention will be described with reference to Figure 9. The waste elevation and disposal structure 1a differs from the waste elevation and disposal structure 1 according to the first embodiment of the present invention in that a caisson 67 is used as the waterproofing barrier 11, and in other respects, it is configured in the same way as the waste elevation and disposal structure 1.

[0104] [Third Embodiment] A waste elevation and disposal structure 1b according to a third embodiment of the present invention will be described with reference to Figure 10. The waste elevation and disposal structure 1b differs from the waste elevation and disposal structure 1 according to the first embodiment of the present invention in that a caisson 67 is used as the waterproofing barrier 11, there is no recess 17, and the waterproofing material 23 is provided on the upper surface 69 of the caisson 67. Other aspects of the waste elevation and disposal structure 1b are configured in the same way as the waste elevation and disposal structure 1.

[0105] To explain further, the waste elevation disposal structure 1b is also constructed by adding a predetermined thickness of new waste 5 on top of the waste 7 (cover soil 15) stored in an existing waste disposal site 3 equipped with a waterproof barrier 11 (for example, caissons 67, cells).

[0106] The waste elevation and disposal structure 1b comprises a first dam 19, an impermeable membrane 21, a waterproofing material 23, and a first new waste 5A. The first dam 19 is installed along the waterproofing structure 11. The first dam 19 is also installed on top of at least the waterproofing structure 11 or the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0107] The impermeable membrane 21 has its lower end 27 positioned at the upper surface 69 of the impermeable wall 11. For example, the thickness direction of the lower end 27 (corresponding to the part 47 shown in Figure 1) of the impermeable membrane 21 is vertical, and the planar lower surface of the lower end 27 is in contact with the planar upper surface 69 of the impermeable wall 11. The planar lower surface of the lower end 27 may be slightly separated from the planar upper surface 69 of the impermeable wall 11. In addition, the part 29 (51) of the impermeable membrane 21 above the lower end 27 covers the side surface 43 of the first dam 19.

[0108] The waterproofing material 23 is provided on the upper surface 69 of the waterproofing structure 11 so as to cover the lower end 27 of the impermeable membrane 21 and the lower end of the upper part 29. That is, the lower end 27 of the impermeable membrane 21 is sandwiched between the waterproofing structure 11 below and the waterproofing material 23 above. Also, the tip of the lower end 27 of the impermeable membrane 21 is located inside the waterproofing material 23. This prevents new waste 5 and the water contained within the new waste 5 from leaking out to the outside (sea 40 side) through the impermeable membrane 21. In addition, a waterproofing material outflow prevention body 70 may be provided on the upper surface 69 of the waterproofing structure 11 to prevent the waterproofing material 23 from spreading on the upper surface 69.

[0109] The first new waste 5A is located on the opposite side of the impermeable wall 11, with the first dam 19 in between, and is situated on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0110] Next, we will explain the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1b.

[0111] In the waste addition method in the waste elevation disposal structure 1b, new waste 5 is added on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The waterproofing wall 11 of the existing waste disposal site 3 is composed of, for example, caissons 67 and cells, which have a planar upper surface 69 of a predetermined width, as described above.

[0112] The waste addition method in the waste elevation and disposal structure 1b comprises a first dam installation step, a first impermeable membrane installation step, a watertight material installation step, and a first waste installation step.

[0113] In the first dam installation process, the first dam 19 is installed along the impermeable wall 11, on top of at least one of the impermeable wall 11 or the waste 7 (existing cover soil 15) of the existing waste disposal site 3. In the first impermeable membrane installation process, the lower end 27 of the impermeable membrane 21 is positioned on the upper surface 69 of the impermeable wall 11 (caisson 67). Then, in the permeable membrane installation process, the impermeable membrane 21 is installed such that the portion 29 above the lower end 27 of the impermeable membrane 21 covers the side surface 43 of the first dam 19 installed in the first dam installation process.

[0114] In the waterproofing material installation process, the waterproofing material 23 is installed on the upper surface 69 of the waterproofing structure 11 so as to cover the lower end portion 27 of the impermeable membrane 21 that was installed in the first waterproofing membrane installation process. In the first waste installation process, a first new waste 5A of a predetermined thickness is installed on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3, on the opposite side of the waterproofing structure 11 with the first dam 19 installed in the first dam installation process in between.

[0115] [Fourth Embodiment] A waste leveling and disposal structure 1c according to the fourth embodiment of the present invention will be described with reference to Figure 11. The waste leveling and disposal structure 1c differs from the waste leveling and disposal structure 1 according to the first embodiment of the present invention in that an existing impermeable membrane 71 is used as the waterproofing layer (surface waterproofing layer) 11A. Other aspects of the waste leveling and disposal structure 1c are configured in the same way as the waste leveling and disposal structure 1.

[0116] To explain further, the waste elevation disposal structure 1c is also constructed by raising new waste 5 on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The waste elevation disposal structure 1c is composed of a caisson 67, backfill stones 73, and an existing impermeable membrane 71 that constitutes (forms) a waterproof barrier 11A. The caisson 67 has a planar top surface 69 of a predetermined width and is installed on a rubble mound 75 which is installed on a permeable layer 9A. The backfill stones 73 and rubble mound 75 are, for example, permeable.

[0117] The backfill stones 73 are installed on the side of caisson 67 opposite to the sea 40 (covering the opposite side). The existing impermeable membrane 71 covers the permeable layer 9A (the top surface of permeable layer 9A) and the backfill stones 73 (the sides and top surface of backfill stones 73). The existing impermeable membrane 71 also covers the part of the top surface 69 of caisson 67 that is on the backfill stone 73 side. The existing waste 7 is placed on top of the existing impermeable membrane 71.

[0118] Furthermore, in the waste elevation disposal structure 1c, the recess 17 is installed at the upper end of the waste 7 of the existing waste disposal site 3, adjacent to the existing impermeable membrane 71 (see Figure 11), or at a location horizontally away from the existing impermeable membrane 71 (see Figure 18).

[0119] [Fifth Embodiment] A waste elevation and disposal structure 1d according to the fifth embodiment of the present invention will be described with reference to Figure 12. The waste elevation and disposal structure 1d differs from the waste elevation and disposal structure 1 according to the first embodiment of the present invention in that it employs a first vertical waterproofing wall 77 and a second vertical waterproofing wall 79 as the waterproofing wall 11. Other aspects of the waste elevation and disposal structure 1d are configured in the same way as the waste elevation and disposal structure 1d.

[0120] To explain in more detail, the waste elevation disposal structure 1d is also constructed by raising new waste 5 on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The existing waste disposal site 3 of the waste elevation disposal structure 1d is composed of a caisson 67, a first vertical impermeable wall 77, and a second vertical impermeable wall 79. The caisson 67 has a planar top surface 69 of a predetermined width and is installed on a rubble mound 75 which is installed on an impermeable geological layer 9. The first vertical impermeable wall 77 is located away from the caisson 67 and is installed on the inside of the caisson 67 (on the opposite side from the sea 40).

[0121] The second vertical waterproofing barrier 79 is located away from the first vertical waterproofing barrier 77 and inside the first vertical waterproofing barrier 77. New waste 5 is piled up and installed on top of the existing waste 7 (existing cover soil 15) stored inside the second vertical waterproofing barrier 79.

[0122] Furthermore, the waste elevation and disposal structure 1d comprises a first dam 19, a filling material (for example, sand) 81, an impermeable membrane 21, a waterproofing material 23, and a first new waste 5A of a predetermined thickness. The first dam 19 is installed along the second vertical waterproofing wall 79, on the opposite side of the first vertical waterproofing wall 77 with the second vertical waterproofing wall 79 in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3. The filling material 81 is permeable; that is, the filling material 81 forms a waterproofing layer.

[0123] The filler material 81 is filled into the space 83 between the first vertical waterproofing wall 77 and the second vertical waterproofing wall 79, such that a gap 85 is created at the upper end of the space 83 between the first vertical waterproofing wall 77 and the second vertical waterproofing wall 79. The upper surface of the sand (filler material 81) is slightly lower than the upper end of the first vertical waterproofing wall 77 and the upper end of the second vertical waterproofing wall 79. The upper surface 69 of the caisson 67, the upper end of the first vertical waterproofing wall 77, and the upper end of the second vertical waterproofing wall 79 are located at approximately the same position in the vertical direction.

[0124] Furthermore, the filler material 81 is also provided in the space 84 between the first vertical waterproofing barrier 77 and the second vertical waterproofing barrier 79. The upper end of the filler material 81 provided in the space 84 is located in approximately the same position as the upper surface 69 of the caisson 67 in the vertical direction.

[0125] The impermeable membrane 21 has a lower end portion 27 that extends horizontally from the upper end of the second vertical impermeable wall 79 toward the upper end of the first vertical impermeable wall 77, to a predetermined point midway between the first vertical impermeable wall 77 and the second vertical impermeable wall 79. In addition, the portion 29 of the impermeable membrane 21 above the lower end portion 27 covers the side surface 43 of the first dam 19.

[0126] The waterproofing material 23 comprises a lower portion 87 and an upper portion 89. The lower portion 87 is filled in the void 85 above the filler material 81 and is in contact with the lower surface of the lower end portion 27 of the impermeable membrane 21. The upper portion 89 is provided on top of the lower portion 87 and is in contact with the upper surface of the lower end portion 27 of the impermeable membrane 21, the lower end of the upper portion 29 of the impermeable membrane 21, and the tip of the impermeable membrane 21. As a result, the waterproofing material 23 covers the entire lower end portion 27 of the impermeable membrane 21. Although not shown in Figure 12, a waterproofing material outflow prevention body similar to the waterproofing material outflow prevention body 70 shown in Figure 10 may be provided at the upper end of the first vertical waterproofing wall 77.

[0127] The first new waste 5A is located on the opposite side of the second vertical impermeable wall 79, which is separated by the first dam 19, and is situated on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0128] Next, we will explain the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1d.

[0129] In the waste addition method for the waste elevation disposal structure 1d, new waste 5 is added on top of the waste 7 of the existing waste disposal site 3. The waste addition method for the waste elevation disposal structure 1d comprises a first dam installation step, a void formation step, a first impermeable membrane installation step, a watertight material installation step, and a first waste installation step.

[0130] In the first dam construction process, the first dam 19 is constructed along the second vertical impermeable wall 79, on the opposite side of the first vertical impermeable wall 77 with the second vertical impermeable wall 79 in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0131] In the void formation process, for example, the upper end portion of the filler material 81 provided in the space 83 between the first vertical waterproofing wall 77 and the second vertical waterproofing wall 79 is removed, and a void 85 is formed at the upper end portion of the filler material 81.

[0132] In the installation process of the first impermeable membrane, the lower end portion 27 of the impermeable membrane 21 is extended in a direction from the upper end of the second vertical impermeable wall 79 toward the upper end of the first vertical impermeable wall 77. In addition, in the installation process of the first impermeable membrane, the lower end portion 27 of the impermeable membrane 21 is extended from the upper end of the second vertical impermeable wall 79 to a predetermined point midway between the first vertical impermeable wall 77 and the second vertical impermeable wall 79. Furthermore, in the installation process of the first impermeable membrane, the impermeable membrane 21 is installed such that the portion 29 above the lower end portion 27 of the impermeable membrane 21 covers the side surface of the first dam 19 that was installed in the first dam installation process.

[0133] In the waterproofing material installation process, the lower portion 87 of the waterproofing material 23 is filled into the void 85 above the filler material 81. The lower portion 87 of the waterproofing material 23 is in contact with the lower surface of the lower end portion 27 of the impermeable membrane 21, which was provided in the first waterproof membrane installation process.

[0134] Furthermore, in the waterproofing material installation process, the upper portion 89 of the waterproofing material 23 is placed on top of the lower portion 87, so that the upper surface of the lower end portion 27 of the impermeable membrane 21 and the tip of the impermeable membrane 21 are in contact with the waterproofing material 23. Then, the waterproofing material installation process causes the lower end portion 27 of the impermeable membrane 21 to be covered by the waterproofing material 23.

[0135] In the first waste installation process, a first new waste 5A (cover soil 25A) of a predetermined thickness is provided. The first new waste 5 (cover soil 25) of a predetermined thickness is provided on the opposite side of the second vertical impermeable wall 79, which is separated from the first dam 19 provided in the first dam installation process, and is provided on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0136] [Sixth Embodiment] A waste elevation and disposal structure 1e according to the sixth embodiment of the present invention will be described with reference to Figure 13. The waste elevation and disposal structure 1e according to the sixth embodiment of the present invention differs from the waste elevation and disposal structure 1d according to the fifth embodiment of the present invention in the installation configuration of the watertight material 23 and the lower end portion 27 of the impermeable membrane 21. Other aspects of the waste elevation and disposal structure 1e are configured in the same way as the waste elevation and disposal structure 1d.

[0137] In other words, the waste elevation disposal structure 1e is also constructed by raising new waste 5 on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The impermeable wall 11 of the waste elevation disposal structure 1e is composed of a first vertical impermeable wall 77 and a second vertical impermeable wall 79. The waste elevation disposal structure 1e has a planar upper surface 69 of a predetermined width and is equipped with a caisson 67 installed on a rubble mound 75 which is installed on an impermeable geological layer 9. The first vertical impermeable wall 77 is installed inside the caisson 67, away from the caisson 67. The second vertical impermeable wall 79 is installed inside the first vertical impermeable wall 77, away from the first vertical impermeable wall 77.

[0138] The recess 17 of the waste elevation disposal structure 1e is located at the upper end of the waste 7 of the existing waste disposal site 3, adjacent to the second vertical waterproofing wall 79. Alternatively, the recess 17 of the waste elevation disposal structure 1e may be located at a location away from the second vertical waterproofing wall 79 in the horizontal direction, as shown in Figure 18.

[0139] [Seventh Embodiment] A waste elevation and disposal structure 1f according to the seventh embodiment of the present invention will be described with reference to Figure 14. The waste elevation and disposal structure 1f according to the seventh embodiment of the present invention differs from the waste elevation and disposal structure 1d according to the fifth embodiment of the present invention in the installation configuration of the watertight material 23 and the lower end portion 27 of the impermeable membrane 21. Other aspects of the waste elevation and disposal structure 1f are configured in the same way as the waste elevation and disposal structure 1d.

[0140] To explain the waste elevation disposal structure 1f in more detail, the waste elevation disposal structure 1f is also constructed by raising new waste 5 on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The existing waste disposal site 3 of the waste elevation disposal structure 1f is equipped with a caisson 67, a first vertical impermeable wall 77, and a second vertical impermeable wall 79. The caisson 67 has a planar top surface 69 of a predetermined width and is installed on a rubble mound 75 which is installed on an impermeable layer 9. The first vertical impermeable wall 77 is located away from the caisson 67 and is installed on the inside of the caisson 67 (on the opposite side from the sea 40).

[0141] The second vertical impermeable wall 79 is located away from the first vertical impermeable wall 77 and inside the first vertical impermeable wall 77. New waste 5 is piled up and placed on top of the existing waste (waste and the existing cover soil covering the surface of this existing waste) that is stored inside the second vertical impermeable wall 79.

[0142] Furthermore, the waste elevation and disposal structure 1f comprises a first dam 19, a filling material (for example, sand) 81, a recess 17, an impermeable membrane 21, a waterproofing material 23, and a first new waste 5A. The first dam 19 is located along the second vertical waterproofing wall 79, on the opposite side of the first vertical waterproofing wall 77 with the second vertical waterproofing wall 79 in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0143] The filler material 81 fills the space 83 between the first vertical waterproofing barrier 77 and the second vertical waterproofing barrier 79, and the space 84 between the caisson 67 and the first vertical waterproofing barrier 77. The recess 17 is located at the upper end of the filler material 81, adjacent to the first vertical waterproofing barrier 77. The recess 17 may also be located at a location away from the first vertical waterproofing barrier 77 in the horizontal direction.

[0144] The impermeable membrane 21 has its lower end 27 inside the recess 17, and the portion 29 above the lower end 27 covers the upper surface of the filling material 81 in the space 83 and the side surface of the first dam 19. The waterproofing material 23 is provided inside the recess 17 so as to cover the entire recess 17. The first new waste 5A has a predetermined thickness. The first new waste 5A is located on the side opposite to the second vertical waterproofing wall 79 with the first dam 19 in between, and is placed on top of the waste 7 (cover soil 15) of the existing waste disposal site 3.

[0145] Next, we will explain the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1f.

[0146] In the waste addition method for the waste elevation disposal structure 1f, new waste 5 is added on top of the waste 7 of the existing waste disposal site 3. The waste addition method for the waste elevation disposal structure 1f comprises a first dam installation process, a recess installation process, a first impermeable membrane installation process, a watertight material installation process, and a first waste installation process.

[0147] In the first dam installation process, the first dam 19 is installed along the second vertical impermeable wall 79, on the opposite side of the first vertical impermeable wall 77 with the second vertical impermeable wall 79 in between, and on the waste 7 (existing cover soil 15) of the existing waste disposal site 3. In the recess installation process, a recess 17 is made at the upper end of the filling material 81 provided in the space 83 between the first vertical impermeable wall 77 and the second vertical impermeable wall 79.

[0148] In the installation step of the first impermeable membrane, the impermeable membrane 21 is installed so that its lower end portion 27 is placed inside the recess 17 installed in the recess installation step. In addition, in the installation step of the first impermeable membrane, the portion 29 of the impermeable membrane 21 above the lower end portion 27 covers the upper surface of the filler material 81 and the side surface of the first dam 19 provided in the first dam installation step. The impermeable membrane 21 is installed in this manner.

[0149] In the waterproofing material installation process, waterproofing material 23 is installed in the recesses 17 so as to fill all of the recesses 17 installed in the recess installation process. In the first waste installation process, the first new waste 5 is installed on top of the waste 7 (cover soil 15) of the existing waste disposal site 3, on the opposite side of the second vertical waterproofing structure 79, which is separated by the first dam 19 installed in the first dam installation process. The first new waste 5 has a predetermined thickness.

[0150] [Eighth Embodiment] A waste elevation and disposal structure 1g according to the eighth embodiment of the present invention will be described with reference to Figure 15. The waste elevation and disposal structure 1g according to the eighth embodiment of the present invention differs from the waste elevation and disposal structure 1 according to the first embodiment of the present invention in the form of the existing waste treatment plant 3, the waterproofing material 23, and the installation configuration of the lower end portion 27 of the impermeable membrane 21. Other aspects of the waste elevation and disposal structure 1g are configured in the same way as the waste elevation and disposal structure 1.

[0151] Let me explain waste leveling disposal structure 1g in more detail. Waste leveling disposal structure 1g is also constructed by raising new waste 5 on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The existing waste disposal site 3 is composed of a first existing impermeable membrane 71 (71A) and a second existing impermeable membrane 71 (71B). The existing waste disposal site 3 is equipped with a caisson 67 and a first backfill stone 73 (73A) and a second backfill stone 73 (73B).

[0152] Caisson 67 has a planar top surface 69 of a predetermined width and is installed on a rubble mound 75 which is installed on top of rock slab 9. The first backfill stone 73A is installed on the side of caisson 67 so as to cover the side opposite to the sea 40. The first existing impermeable membrane 71A covers rock slab 9 (for example, the part of rock slab 9 near the first backfill stone 73A), the side of the first backfill stone 73A, and the side of the top surface of the first backfill stone 73A that is opposite to caisson 67.

[0153] The second backfill stone 73B is installed in the place of the first existing impermeable membrane 71A, on the opposite side of the first backfill stone 73A, and covering the first existing impermeable membrane 71A. The second existing impermeable membrane 71B covers stratum 9 (for example, the part of stratum 9 near the second backfill stone 73B), the side of the second backfill stone 73B, and the part of the upper surface of the second backfill stone 73B that is opposite to the caisson 67.

[0154] The existing waste 7 and existing cover soil 15 are stored inside the second existing impermeable membrane 71B. Although layer 9 is an impermeable layer, layer 9 may be a permeable layer. In this case, the lower ends of the first existing impermeable membrane 71A and the lower ends of the second existing impermeable membrane 71B are assumed to extend over layer 9 to the right in Figure 15 without interruption, as shown in Figure 15, and cover the entire layer 9. Furthermore, the first existing impermeable membrane 71A is assumed to be stacked on top of layer 9, and the second existing impermeable membrane 71B is assumed to be stacked on top of the first existing impermeable membrane 71A.

[0155] Furthermore, the waste elevation and disposal structure 1g comprises a first dam 19, an impermeable membrane 21, a first waterproofing material 23 (23A), a second waterproofing material 23 (23B), and a first new waste 5 (5A).

[0156] The first dam 19 is constructed along the second existing impermeable membrane 71B. The first dam 19 is also constructed on the opposite side of the first existing impermeable membrane 71A, with the upper end of the second existing impermeable membrane 71B in between, and on the waste 7 (existing cover soil 15) of the existing waste disposal site 3. The upper end of the second existing impermeable membrane 71B is the part that covers the upper surface of the second backfill stone 73B of the second existing impermeable membrane 71B.

[0157] The impermeable membrane 21 has a lower end 27 that extends along the upper end of the second existing impermeable membrane 71B, and the portion 29 above the lower end 27 covers the side surface of the first dam 19.

[0158] The first waterproofing material 23A is installed on top of the second backfill stone 73B and covers the upper end of the second existing impermeable membrane 71B and the lower end 27 of the impermeable membrane 21.

[0159] The second waterproofing material 23B is adjacent to the first waterproofing material 23A and covers the upper end of the first existing impermeable membrane 71A (the part covering the upper surface of the first backfill stone 73B). A waterproofing material runoff prevention body similar to the waterproofing material runoff prevention body 70 shown in Figure 10 may also be provided at the upper end of the caisson 67.

[0160] The first new waste 5 is located on the opposite side of the impermeable wall 11, with the first dam 19 in between, and is situated on top of the waste 7 (cover soil 15) of the existing waste disposal site 3.

[0161] In Figure 15(b), the lower end 27 of the impermeable membrane 21 and the upper end of the impermeable membrane 71B are in contact with each other. However, as shown in Figure 15(c), the lower end 27 of the impermeable membrane 21 may be separated from the upper end of the second existing impermeable membrane 71B.

[0162] Next, we will explain the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1g.

[0163] In the waste addition method for the waste elevation disposal structure 1g, new waste 5 is added on top of the waste 7 of the existing waste disposal site 3. The waste addition method for the waste elevation disposal structure 1g comprises a first dam installation step, a first impermeable membrane installation step, a first waterproofing material installation step, a second waterproofing material installation step, and a first waste installation step.

[0164] In the first dam installation process, the first dam 19 is constructed along the second existing impermeable membrane 71B. The first dam 19 is constructed on the opposite side of the first existing impermeable membrane 71A, with the upper end of the second existing impermeable membrane 71 in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0165] In the installation process of the first impermeable membrane, the impermeable membrane 21 is installed such that the lower end portion 27 of the impermeable membrane 21 extends along the upper end portion of the second existing impermeable membrane 71B. In addition, in the installation process of the first impermeable membrane, the portion 29 of the impermeable membrane 21 above the lower end portion 27 of the impermeable membrane 21 is installed such that it covers the side surface of the first dam 19 installed in the first dam installation process.

[0166] In the first waterproofing material installation process, the first waterproofing material is installed so as to cover the upper end of the second existing impermeable membrane 71B and the lower end 27 of the impermeable membrane 21 installed in the first waterproofing membrane installation process. In the second waterproofing material installation process, the second waterproofing material is installed so as to cover the upper end of the first existing impermeable membrane 71A adjacent to the first waterproofing material 23A installed in the first waterproofing material installation process. In the first waste installation process, the first new waste 5 is installed on top of the waste 7 (covering soil 15) of the existing waste disposal site 3, on the side opposite to the waterproofing structure 11 (caisson 67) with the first dam 19 in between. The first new waste 5 has a predetermined thickness.

[0167] [Ninth Embodiment] A waste elevation and disposal structure 1h according to the ninth embodiment of the present invention will be described with reference to Figure 16. The waste elevation and disposal structure 1h according to the ninth embodiment of the present invention differs from the waste elevation and disposal structure 1 according to the first embodiment of the present invention in the form of the existing waste treatment plant 3, the waterproofing material 23, the installation configuration of the lower end portion 27 of the impermeable membrane 21, and so on. Other aspects of the waste elevation and disposal structure 1g are configured in the same way as the waste elevation and disposal structure 1.

[0168] Let me explain the waste elevation disposal structure 1h in more detail. In the waste elevation disposal structure 1h, new waste 5 is piled on top of the waste 7 (cover soil 15) stored in the existing waste disposal site 3. The waterproofing barrier 11 of the existing waste disposal site 3 is constructed with the existing impermeable membrane 71. The existing waste disposal site 3 is equipped with a caisson 67 and backfill stones 73.

[0169] Caisson 67 has a planar top surface 69 of a predetermined width and is installed on a rubble mound 75 which is installed on top of a rock formation 9 (for example, an impermeable rock formation). Backfill stones 73 are installed on the side of caisson 67 opposite to the sea 40 so as to cover the aforementioned side. An existing impermeable membrane 71 covers the rock formation 9, the backfill stones 73, and the portion of the top surface 69 of caisson 67 that is on the backfill stone 73 side.

[0170] The existing waste 7 and existing cover soil 15 are stored inside the second existing impermeable membrane 71B. As explained with reference to Figure 15, the geological layer 9 may also be a permeable layer. In this case, the lower end of the existing impermeable membrane 71 is assumed to extend over the geological layer 9 to the right side of Figure 16 without interruption, as shown in Figure 16, and cover the entire geological layer 9.

[0171] Furthermore, the waste elevation and disposal structure 1h comprises a first dam 19, an impermeable membrane 21, a waterproofing material 23, and a first new waste 5A. The first dam 19 is located along the backfill stones 73, on the opposite side of the caisson 67 with the backfill stones 73 (the upper end of the existing impermeable membrane 71) in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0172] The impermeable membrane 21 has its lower end 27 located at the upper end (the part covering the upper surface of the backfill stone 73) of the existing impermeable membrane 71. Furthermore, the part 29 of the impermeable membrane 21 above the lower end 27 covers the side surface of the first dam 19.

[0173] The waterproofing material 23 is installed on top of the backfill stones 73 and covers the upper end of the existing impermeable membrane 71 and the lower end 27 of the impermeable membrane 21. A waterproofing material runoff prevention body similar to the waterproofing material runoff prevention body 70 shown in Figure 10 may also be provided on the upper surface 69 of the caisson 67.

[0174] The first new waste 5A is located on the opposite side of the backfill stones 73 (caisson 67) separated by the first dam 19, and is placed on top of the existing waste 7 (cover soil 15) of the waste disposal site 3. The first new waste has a predetermined thickness.

[0175] Next, we will explain the additional waste construction method (waste elevation and storage method) in the waste elevation and disposal structure 1h.

[0176] In the waste addition method for the waste elevation disposal structure 1h, new waste 5 is added on top of the waste 7 of the existing waste disposal site 3. The waste addition method for the waste elevation disposal structure 1h consists of a first dam installation process, a first impermeable membrane installation process, a watertight material installation process, and a first new waste process.

[0177] In the first dam construction process, the first dam 19 is constructed along the backfill stones 73, on the opposite side of the caisson 67 with the backfill stones 73 in between, and on top of the waste 7 (existing cover soil 15) of the existing waste disposal site 3.

[0178] In the installation process of the first impermeable membrane, the impermeable membrane 21 is installed such that its lower end portion 27 is located at the upper end portion of the existing impermeable membrane. Furthermore, in the installation process of the first impermeable membrane, the impermeable membrane 21 is installed such that the portion 29 above the lower end portion 27 of the impermeable membrane 21 covers the side surface of the first dam 19 installed in the first dam installation process.

[0179] In the waterproofing material installation process, the waterproofing material 23 is installed so as to cover the upper end of the existing impermeable membrane 71 and the lower end 27 of the impermeable membrane 21 installed in the first impermeable membrane installation process. The waterproofing material 23 installed in the waterproofing material installation process is located on top of the backfill stone 73.

[0180] In the first new waste disposal process, a first new waste 5A of a predetermined thickness is provided on the opposite side of the backfill stones 73 (caisson 67) that are separated by the first dam 19, which was constructed in the first dam construction process. The first new waste 5A provided in the first new waste disposal process is located on top of the waste 7 (cover soil 15) of the existing waste disposal site 3.

[0181] Furthermore, in the waste elevation and disposal structure 1b to the waste elevation and disposal structure 1h according to the second embodiment of the present invention, a second dam 31 and a second new waste 5B may also be provided. The second dam 31 and the second new waste 5B are provided in the same manner as in the waste elevation and disposal structure 1 according to the first embodiment of the present invention.

[0182] By the way, the waste elevation disposal structure 1 to waste elevation disposal structure 1h described above is an example of a waste elevation disposal structure in which new waste is piled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, and comprises new waste of a predetermined thickness placed on top of the waste in the existing waste disposal site, an impermeable membrane whose upper portion above the lower end covers the side surface of the new waste, and a waterproofing material that is in contact with the lower end of the impermeable membrane and a predetermined portion of the waterproof barrier, and covers the lower end of the impermeable membrane and the predetermined portion of the waterproof barrier, in order to prevent the new waste, the water contained in the new waste, and the waste in the existing waste disposal site itself from leaking out of the waterproof barrier.

[0183] Furthermore, the above-mentioned method for adding waste is an example of a method for adding waste to an existing waste disposal site, comprising: a waste installation step of adding new waste on top of the waste of the existing waste disposal site; an impermeable membrane installation step of installing an impermeable membrane such that the portion above the lower end covers the sides of the new waste added in the waste installation step; and an impermeable material installation step of installing an impermeable material so as to be in contact with the lower end of the impermeable membrane and a predetermined portion of the impermeable structure, and covering the lower end of the impermeable membrane and the predetermined portion of the impermeable structure, in order to prevent the new waste added in the waste installation step, the water contained in the new waste, and the waste of the existing waste disposal site itself from leaking out of the impermeable structure.

[0184] Furthermore, the above-described method for adding waste is a method for adding waste to an existing waste disposal site, and is an example of a method for adding waste to an existing waste disposal site, comprising: a recess installation step of installing a recess at the upper end of the waste stored in the existing waste disposal site, adjacent to the vertical waterproofing barrier of the existing waste disposal site, or at a location horizontally away from the vertical waterproofing barrier; a waste installation step of adding the new waste to the waste of the existing waste disposal site on the opposite side of the vertical waterproofing barrier, with the recess installed in the recess installation step in between, until it reaches a predetermined thickness; an impermeable membrane first installation step of installing an impermeable membrane with its lower end positioned within the recess installed in the recess installation step, and extending upward from the lower end to cover the sides of the new waste added in the waste installation step; and a waterproofing material installation step of installing a waterproofing material in the recess installed in the recess installation step after the impermeable membrane has been installed in the impermeable membrane step.

[0185] Although this embodiment has been described above, this embodiment is not limited to these, and various modifications are possible within the scope of the gist of this embodiment. [Explanation of symbols]

[0186] 1. Waste elevation and disposal structure 3 Existing waste disposal sites 5. Waste 5A First new waste 5B Second new type of waste 7 Existing waste 9 Impermeable strata 9A Permeable strata 11 Waterproofing 17 Recess 19. First Dam 21 Impermeable membrane 23 Waterproofing material 23A First waterproofing material 23B Second waterproofing material 27 Lower end 29 Upper part 31. The second dam 33 Retained water discharge device 40 Sea 67 Caisson 69 Top surface of the waterproofing barrier 71 Existing impermeable membranes 71A First existing impermeable membrane 71B Second existing impermeable membrane 73 backfill stones 73A First backfill stone 73B Second backfill stone 77. First vertical waterproofing wall 79. Second vertical waterproofing wall 81 Filling material 83 Space 85 void 87 Lower part 89 Upper part

Claims

1. A waste elevation disposal structure in which new waste is piled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, The waste placed on top of the waste at the aforementioned existing waste disposal site, An impermeable membrane, the portion above the lower end covering the side of the new waste, In order to prevent the new waste, the water contained in the new waste, and the waste itself from the existing waste disposal site from leaking outside the waterproof barrier, a waterproofing material is provided that is in contact with the lower end of the impermeable membrane and a predetermined part of the waterproof barrier, and covers the lower end of the impermeable membrane and the predetermined part of the waterproof barrier. A waste elevation disposal structure having [a specific feature].

2. A waste elevation disposal structure in which new waste is piled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, A recess is provided at the upper end of the waste at the existing waste disposal site, adjacent to the waterproof barrier or at a location horizontally away from the waterproof barrier, A first dam is provided along the recess, on the opposite side of the impermeable structure with the recess in between, and over the waste of the existing waste disposal site. An impermeable membrane having its lower end inserted into the recess and the portion above the lower end covering the side surface of the first dam, A water-blocking material provided in the recess, A first new waste of a predetermined thickness is provided on the part opposite to the impermeable structure with the first dam in between, on top of the waste of the existing waste disposal site, A waste elevation disposal structure having [a specific feature].

3. A waste elevation disposal structure in which new waste is piled on top of waste stored in an existing waste disposal site equipped with a waterproof barrier, A first dam is provided along the impermeable structure, over at least the impermeable structure and the waste of the existing waste disposal site, An impermeable membrane whose lower end is located on the upper surface of the waterproofing structure, and whose portion above the lower end covers the side surface of the first dam, A waterproofing material is provided on the upper surface of the waterproofing structure so as to cover the lower end of the impermeable membrane, A first new waste of a predetermined thickness is provided on the part opposite to the impermeable structure with the first dam in between, on top of the waste of the existing waste disposal site, A waste elevation disposal structure having [a specific feature].

4. The aforementioned waterproofing structure is formed of an existing impermeable membrane that covers the permeable layer and the backfill stones installed on the sides of the caisson placed on the permeable layer. The waste elevation and disposal structure according to claim 2, wherein the recess is located at the upper end of the waste in the existing waste disposal site, adjacent to the existing impermeable membrane, or horizontally away from the existing impermeable membrane.

5. A waste elevation disposal structure comprising a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, wherein new waste is piled on top of the waste of an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, Along the second vertical impermeable structure, on the opposite side of the first vertical impermeable structure with the second vertical impermeable structure in between, a first dam is constructed over the waste of the existing waste disposal site, A filler material is filled into the space between the first vertical waterproofing wall and the second vertical waterproofing wall so that a gap is created at the upper end of the space between the first vertical waterproofing wall and the second vertical waterproofing wall, The lower end extends in the direction from the upper end of the second vertical impermeable wall toward the upper end of the first vertical impermeable wall, from the upper end of the second vertical impermeable wall to a predetermined point midway between the first vertical impermeable wall and the second vertical impermeable wall, and the portion above the lower end covers the side surface of the first dam, an impermeable membrane, A waterproofing material comprising a lower portion and an upper portion provided above the lower portion, wherein the lower portion is filled in the void and in contact with the lower surface of the lower end of the impermeable membrane, and the upper portion is in contact with the upper surface of the lower end of the impermeable membrane, thereby covering the lower end of the impermeable membrane. A first new waste of a predetermined thickness is provided on top of the waste of the existing waste disposal site, on the side opposite to the second vertical impermeable structure with the first dam in between, A waste elevation disposal structure having [a specific feature].

6. The aforementioned waterproofing structure comprises a first vertical waterproofing structure installed inside a caisson placed on a rubble mound on an impermeable geological layer, and a second vertical waterproofing structure installed inside the first vertical waterproofing structure. The waste elevation disposal structure according to claim 2, wherein the recess is located at the upper end of the waste of the existing waste disposal site, adjacent to the second vertical waterproofing barrier, or at a location horizontally away from the second vertical waterproofing barrier.

7. A waste elevation disposal structure comprising a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, wherein new waste is piled on top of the waste of an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, Along the second vertical impermeable structure, a first dam is constructed on the opposite side of the first vertical impermeable structure with the second vertical impermeable structure in between, and over the waste of the existing waste disposal site. A filler material is provided in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier. A recess is provided at the upper end of the filler material, adjacent to the first vertical waterproofing barrier or at a location in the horizontal direction away from the first vertical waterproofing barrier, An impermeable membrane having its lower end inserted into the recess and the portion above the lower end covering the side surface of the first dam, A water-blocking material provided in the recess, A first new waste of a predetermined thickness is provided on top of the waste of the existing waste disposal site, on the side opposite to the second vertical impermeable structure with the first dam in between, A waste elevation disposal structure having [a specific feature].

8. A waste elevation disposal structure comprising a caisson installed on a rubble mound on an impermeable geological layer, a first backfill stone installed on the side of the caisson opposite to the sea, a first existing impermeable membrane, a second backfill stone installed on the opposite side of the first existing impermeable membrane from the first backfill stone so as to cover the first existing impermeable membrane, wherein the first existing impermeable membrane covers the impermeable geological layer and the first backfill stone, and the second existing impermeable membrane covers the impermeable geological layer and the second backfill stone, thereby forming a watertight barrier, and new waste is piled on top of waste stored in an existing waste disposal site. A first dam is provided along the second existing impermeable membrane, on the opposite side of the first existing impermeable membrane with the upper end of the second existing impermeable membrane in between, and over the waste of the existing waste disposal site, An impermeable membrane whose lower end extends along the upper end of the second existing impermeable membrane, and whose portion above the lower end covers the side surface of the first dam, A first waterproofing material is provided on the second backfill stone and covers the upper end of the second existing waterproof membrane and the lower end of the waterproof membrane, A second waterproofing material adjacent to the first waterproofing material and covering the upper end of the first existing impermeable membrane, A first new waste of a predetermined thickness is provided on the part opposite to the impermeable structure with the first dam in between, and on top of the waste of the existing waste disposal site. A waste elevation disposal structure having [a specific feature].

9. A waste elevation disposal structure comprising a caisson installed on a rubble mound on an impermeable geological layer, backfill stones installed on the side of the caisson opposite to the sea, and an existing impermeable membrane covering the impermeable geological layer, the backfill stones, and the portion of the upper surface of the caisson on the backfill stone side, wherein new waste is piled on top of the waste of an existing waste disposal site where the existing impermeable membrane constitutes a waterproof barrier, Along the aforementioned backfill stones, on the opposite side of the caisson with the backfill stones in between, a first dam is constructed over the waste of the existing waste disposal site, An impermeable membrane whose lower end is located at the upper end of the existing impermeable membrane, and whose portion above the lower end covers the side surface of the first dam, A waterproofing material provided on top of the backfill stone, covering the upper end and lower end of the existing impermeable membrane, A first new waste of a predetermined thickness is provided on top of the waste of the existing waste disposal site, on the side opposite to the backfill stone with respect to the first dam, A waste elevation disposal structure having [a specific feature].

10. The waste elevation and disposal structure according to any one of claims 1 to 9, wherein the impermeable material comprises at least one of the following: an asphalt mixture-based impermeable impermeable material, a soil-based impermeable impermeable material, a chemical-based impermeable impermeable material, or a concrete-based impermeable impermeable material.

11. A second dam is provided along the first dam, on the opposite side of the impermeable structure with the first dam in between, and on at least one of the first dam or the first new waste, The portion on the opposite side of the impermeable structure with respect to the second dam, and the second new waste of a predetermined thickness which is placed on top of the first new waste, A waste elevation and disposal structure according to any one of claims 2 to 9, wherein the upper portion of the impermeable membrane covers the side surface of the second dam.

12. The existing waste disposal site is equipped with a water retention discharge device for discharging water contained in the waste stored in the existing waste disposal site. A waste elevation and disposal structure according to any one of claims 2 to 9, wherein the water contained in the new waste flows down by gravity to the waste stored in the existing waste disposal site.

13. A waste disposal method for adding new waste on top of an existing waste disposal site equipped with a waterproof barrier, A first waste installation step involves adding new waste on top of the waste in the existing waste disposal site, An impermeable membrane installation step involves installing an impermeable membrane such that the portion above the lower end covers the side of the new waste added in the first waste installation step, In order to prevent the new waste added in the waste installation process, the water contained in the new waste, and the waste itself from the existing waste disposal site from leaking outside the existing waste disposal site, a waterproofing material installation process is performed in which waterproofing material is installed so as to cover the lower end of the impermeable membrane and a predetermined part of the waterproofing work, An additional construction method for waste containing [unspecified].

14. This is a waste augmentation method that involves adding new waste on top of waste stored in an existing waste disposal site. A recess installation step involves installing a recess at the upper end of the waste stored in the existing waste disposal site, at a location adjacent to the vertical waterproofing barrier of the existing waste disposal site, or at a location horizontally away from the vertical waterproofing barrier. A first waste installation step involves adding new waste to the portion opposite to the vertical waterproofing barrier, with the recess installed in the recess installation step in between, on top of the waste from the existing waste disposal site. An impermeable membrane installation step involves positioning the lower end of the impermeable membrane within the recess installed in the recess installation step, and installing the impermeable membrane so as to extend upward from the lower end to cover the sides of the new waste added in the first waste installation step. The process involves installing a waterproofing material in the recess created in the recess creation step, and then installing a waterproofing material in the recess. An additional construction method for waste containing [unspecified].

15. This is a waste augmentation method that involves adding new waste on top of waste stored in an existing waste disposal site. A recess installation step involves installing a recess at the upper end of the waste stored in the existing waste disposal site, adjacent to the waterproofing barrier of the existing waste disposal site. A first dam installation step involves installing a first dam along the recess installed in the recess installation step, on the opposite side of the waterproofing structure with the recess in between, and on top of the waste of the existing waste disposal site. A step of installing the lower end of an impermeable membrane, wherein the lower end of the impermeable membrane is installed so that it fits into the recess installed in the recess installation step, After installing the lower end of the impermeable membrane in the aforementioned impermeable membrane lower end installation step, a waterproofing material installation step is performed in which a waterproofing material is installed in the recess created in the aforementioned recess installation step. After installing the waterproofing material in the waterproofing material installation step, the waterproofing membrane is installed by extending the portion of the waterproofing membrane above the lower end upward so as to cover the side surface of the first dam provided in the first dam installation step, and the waterproofing membrane is installed in the first waterproofing membrane installation step. In the first step of installing the impermeable membrane, after installing the impermeable membrane, a first waste installation step is performed in which new waste is added to the waste of the existing waste disposal site until it reaches a predetermined thickness, on the opposite side of the impermeable structure with the first dam in between, which was provided in the first dam installation step. An additional construction method for waste containing [unspecified].

16. A waste augmentation method for adding new waste to an existing waste disposal site equipped with a waterproof barrier, A first dam installation step involves installing a first dam along the aforementioned impermeable structure, on at least one of the impermeable structure or the waste of the existing waste disposal site, An installation step for a first impermeable membrane, wherein the lower end of the impermeable membrane is located on the upper surface of the waterproofing work, and the portion above the lower end covers the side surface of the first dam provided in the first dam installation step, A waterproofing material installation step involves providing a waterproofing material on the upper surface of the waterproofing structure so as to cover the lower end of the waterproofing membrane provided in the installation step of the waterproofing membrane first, A first waste installation step involves installing a first new waste of a predetermined thickness on top of the waste of the existing waste disposal site, in the area opposite to the impermeable structure with the first dam installed in the first dam installation step, An additional construction method for waste containing [unspecified].

17. A waste addition method for adding new waste to an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, comprising a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, wherein the waterproofing barrier comprises a caisson, a first vertical waterproofing barrier provided inside the caisson, and a second vertical waterproofing barrier provided inside the first vertical waterproofing barrier, A first dam installation step involves installing a first dam along the second vertical impermeable structure, on the opposite side of the first vertical impermeable structure with the second vertical impermeable structure in between, and on top of the waste of the existing waste disposal site. A void formation step is performed to form a void at the upper end of the filler material provided in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier, Installation step of a first impermeable membrane, wherein the lower end of the impermeable membrane is provided such that it extends from the upper end of the second vertical impermeable membrane toward the upper end of the first vertical impermeable membrane, to a predetermined location midway between the first vertical impermeable membrane and the second vertical impermeable membrane, and the portion above the lower end of the impermeable membrane covers the side surface of the first dam provided in the first dam installation step, A waterproofing material installation step comprising installing a waterproofing material comprising a lower portion and an upper portion provided above the lower portion, wherein the waterproofing material is installed such that the lower portion fills the void and contacts the lower surface of the lower end of the impermeable membrane, and the upper portion contacts the upper surface of the lower end of the impermeable membrane and covers the lower end of the impermeable membrane, A first waste installation step involves installing a first new waste of a predetermined thickness on top of the waste of the existing waste disposal site, in the area opposite to the second vertical impermeable structure, with the first dam installed in the first dam installation step in between, An additional construction method for waste containing [unspecified].

18. A waste addition method for adding new waste to an existing waste disposal site where waste is stored inside the second vertical waterproofing barrier, comprising a caisson, a first vertical waterproofing barrier installed inside the caisson, and a second vertical waterproofing barrier installed inside the first vertical waterproofing barrier, wherein the waterproofing barrier comprises a caisson, a first vertical waterproofing barrier installed inside the caisson, and a second vertical waterproofing barrier installed inside the first vertical waterproofing barrier, A first dam installation step involves installing a first dam along the second vertical impermeable structure, on the opposite side of the first vertical impermeable structure with the second vertical impermeable structure in between, and over the waste of the existing waste disposal site. A recess installation step, comprising: providing a recess at the upper end of the filler material provided in the space between the first vertical waterproofing barrier and the second vertical waterproofing barrier, at a location adjacent to the first vertical waterproofing barrier or at a location horizontally away from the first vertical waterproofing barrier; An impermeable membrane first installation step, wherein the impermeable membrane is installed such that its lower end fits into the recess installed in the recess installation step, and the portion above the lower end covers the side surface of the first dam provided in the first dam installation step, A waterproofing material installation step involves installing a waterproofing material in the recess installed in the recess installation step, A first waste installation step involves installing a first new waste of a predetermined thickness on top of the waste of the existing waste disposal site, in the area opposite to the second vertical impermeable structure, with the first dam installed in the first dam installation step in between, An additional construction method for waste containing [unspecified].

19. A waste augmentation method for adding new waste to waste stored in an existing waste disposal site, comprising: a caisson installed on an impermeable geological layer; a first backfill stone installed on the side of the caisson opposite to the sea; a first existing impermeable membrane; a second backfill stone installed on the opposite side of the first existing impermeable membrane from the first backfill stone so as to cover the first existing impermeable membrane; and a second existing impermeable membrane, wherein the first existing impermeable membrane covers the impermeable geological layer and the first backfill stone, and the second existing impermeable membrane covers the impermeable geological layer and the second backfill stone, thereby forming a waterproof barrier. A first dam installation step involves installing a first dam along the second existing impermeable membrane, on the opposite side of the first existing impermeable membrane with the upper end of the second existing impermeable membrane in between, and on top of the waste of the existing waste disposal site. An installation step for a first impermeable membrane, wherein the lower end extends along the upper end of the second existing impermeable membrane, and the portion above the lower end covers the side surface of the first dam provided in the first dam installation step, A first waterproofing material installation step involves providing a first waterproofing material on top of the second backfill stone, so as to cover the upper end of the second existing waterproof membrane and the lower end of the waterproof membrane provided in the first waterproofing membrane installation step, A second waterproofing material installation step involves installing a second waterproofing material adjacent to the first waterproofing material installed in the first waterproofing material installation step, so as to cover the upper end of the first existing impermeable membrane, A first waste installation step involves providing a first new waste of a predetermined thickness on top of the waste from the existing waste disposal site, on the side opposite to the impermeable structure with the first dam in between; An additional construction method for waste containing [unspecified].

20. A waste disposal method comprising a caisson installed on an impermeable geological layer, backfill stones installed on the side of the caisson opposite to the sea, and an existing impermeable membrane covering the impermeable geological layer, the backfill stones, and the portion of the upper surface of the caisson that is on the backfill stone side, wherein the existing impermeable membrane constitutes a waterproof barrier, and the method for adding new waste to an existing waste disposal site, wherein the existing impermeable membrane constitutes a waterproof barrier, A first dam installation step involves installing a first dam along the backfill stones, on the opposite side of the caisson with the backfill stones in between, and on top of the waste from the existing waste disposal site. An installation step for a first impermeable membrane, wherein the lower end of the impermeable membrane is located at the upper end of the existing impermeable membrane, and the portion above the lower end covers the side surface of the first dam provided in the first dam installation step, A waterproofing material installation step involves providing a waterproofing material on top of the backfill stone, so as to cover the upper end of the existing waterproof membrane and the lower end of the waterproof membrane installed in the installation step of the first waterproof membrane, A first new waste disposal step is performed in which a first new waste of a predetermined thickness is placed on top of the waste of the existing waste disposal site, in the area opposite to the backfill stones with respect to the first dam established in the first dam installation step, An additional construction method for waste containing [unspecified].

21. A second dam installation step is performed, in which, after adding new waste in the first waste installation step, a second dam is installed along the first dam installed in the first dam installation step, on top of at least one of the first dam installed in the first dam installation step or the new waste added in the first waste installation step, After the second dam is constructed in the second dam construction step, the upper portion of the impermeable membrane is further extended upward to cover the side surface of the second dam constructed in the second dam construction step, thereby installing the impermeable membrane in a second impermeable membrane construction step, In the installation step of the impermeable membrane second, after the impermeable membrane is installed, a second waste installation step is performed in which new waste is added on top of the new waste added in the first waste installation step, on the side opposite to the impermeable structure with the second dam provided in the second dam installation step, until a predetermined thickness is reached. A method for adding waste according to any one of claims 15 to 20, comprising:

22. The waste augmentation method according to claim 21, wherein, in the installation step of the impermeable membrane second, the upper portion of the impermeable membrane is rolled up before the upper portion of the impermeable membrane is extended upward, the upper portion of the impermeable membrane is rolled up.

23. The waste augmentation method according to claim 21, wherein when the impermeable membrane is installed in the installation step of the impermeable membrane second, the impermeable membrane provided in the installation step of the impermeable membrane first and the impermeable membrane provided in the installation step of the impermeable membrane second are joined to each other.

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