Construction methods for underground structures

Abstract

To provide an underground structure construction method enabling construction to be easily and safely performed.SOLUTION: An underground structure construction method in the embodiment comprises: a cylindrical wall body erection step to hold a lateral wall member 1, which has joint parts 11, 12 on both ends thereof in short-length direction, when vertical direction is longitudinal direction, so as to be erected on the foundation, and connect one joint part 11 of the held lateral wall member 1 and the other joint part 12 of other lateral wall member 10 different from the lateral wall member 1, and erect a cylindrical wall body 10, which is formed into a cylindrical shape by a plurality of lateral wall members 1, on the ground; an installation step to sequentially install the plurality of lateral wall members 1 constituting the cylindrical wall body 10 into the ground and bury the cylindrical wall body 10 in the ground; and an excavation step to excavate the inside of the cylindrical wall body 10.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a construction method for underground structures.

Background Art

[0002] When constructing underground structures such as sump wells, deep foundation piles, underwater temporary cut-offs, and bridge piers, liner plates are mainly used as soil retention. For example, as a technique for constructing an underground structure such as a sump well using a liner plate, the disclosed technique of Patent Document 1 is disclosed.

[0003] The connection method of the liner plate of Patent Document 1 is to temporarily fix by attaching a temporary fixing tool to the circumferential flange of one liner plate and attaching a temporary fixing tool to the circumferential flange of the other liner plate, insert a fastening fitting into each hole of each circumferential flange, and connect each circumferential flange via a fastening member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the disclosed technique of Patent Document 1, since a worker for holding the liner plate at a predetermined height becomes unnecessary by applying a temporary fixing tool to the circumferential flange of the liner plate. However, before holding at a predetermined height, it is necessary to manually transport and position a large number of liner plates to a predetermined position, and then it is necessary to connect the liner plates to each other with a large number of bolts and nuts.

[0006] Therefore, the technology disclosed in Patent Document 1 results in a large number of bolt and nut connections when assembling the liner plates, making construction time-consuming. Furthermore, each liner plate weighs approximately 30 kg, and a considerable number of these need to be moved and positioned manually, placing a heavy burden on workers. For this reason, there was a need for a technology that could facilitate the construction of underground structures. Moreover, the technology disclosed in Patent Document 1 leaves the excavated surface exposed on the side of the ground after excavation but before assembling the liner plates, raising concerns about safety in terms of collapse. Therefore, there was a need for a technology that could improve the safety of underground structure construction.

[0007] Therefore, the present invention was devised in view of the above circumstances, and its objective is to provide a method for constructing underground structures that can be carried out easily and safely. [Means for solving the problem]

[0008] The method for constructing an underground structure according to the first invention is a method for constructing an underground structure, comprising: holding a side wall member, whose longitudinal direction is vertical and which has joints formed at both ends in the short direction, in an upright position relative to the ground; connecting one joint of the held side wall member to the other joint of another side wall member different from the said side wall member, thereby erecting a cylindrical wall body formed by a plurality of the side wall members on the ground; a casting step in which the plurality of side wall members constituting the cylindrical wall body are sequentially driven into the ground, thereby burying the cylindrical wall body in the ground; and an excavation step in which the inside of the cylindrical wall body is excavated. In the cylindrical wall erection process, the side wall member is driven into the ground using a vibratory pile driver, burying the lower end of the side wall member in the ground, the vibratory pile driver is then separated from the side wall member, and the side wall member is held upright relative to the ground. It is characterized by the following. The construction method for an underground structure according to the second invention is characterized in that, in the cylindrical wall erection step, a holding member is installed on the ground surface of the ground, the lower end of the side wall member is buried in the ground, and the side wall member is held upright relative to the ground by the holding member. The construction method for an underground structure according to the third invention is characterized in that, in the second invention, the holding member has a bottom plate portion and a guide member that rises from the bottom plate portion, and in the cylindrical wall erection step, the bottom plate portion is installed on the ground surface of the ground and the side wall member is held in place with respect to the ground by the guide member. The construction method for an underground structure according to the fourth invention is characterized in that, in the cylindrical wall erection step, a plate-shaped guide member having an opening is installed on the ground surface of the ground, and in the casting step, the outer surface of the side wall member is guided by the inner surface of the opening and the side wall member is cast into the ground. .

[0009] The fifth invention relates to a method for constructing an underground structure, comprising: a cylindrical wall erection step of erecting a cylindrical wall on the ground, wherein a side wall member, whose longitudinal direction is vertical and which has joint portions formed at both ends in the short direction, is held upright with respect to the ground, one joint portion of the held side wall member is connected to the other joint portion of another side wall member different from the said side wall member, and a cylindrical wall formed by a plurality of the side wall members is erected on the ground; a casting step of sequentially driving the plurality of the side wall members constituting the cylindrical wall into the ground and burying the cylindrical wall in the ground; and an excavation step of excavating the inside of the cylindrical wall, wherein in the cylindrical wall erection step, a holding member is installed on the ground surface of the ground, the lower end of the side wall member is placed on the ground, and the side wall member placed on the ground is held upright with respect to the ground by the holding member. The construction method for an underground structure according to the sixth invention is characterized in that, in the fifth invention, the holding member has a bottom plate portion and a guide member that rises from the bottom plate portion, and in the cylindrical wall erection step, the bottom plate portion is installed on the ground surface of the ground and the side wall member is held in place with respect to the ground by the guide member.

[0010] The 7The construction method for underground structures according to the invention is the first invention or the first invention. 5 In the invention, the cylindrical wall erection step is characterized by installing a guide member to serve as a guide when casting the side wall member, and the casting step is characterized by using the guide member to guide the side wall member and then casting the side wall member.

[0011] The 8 The construction method for underground structures according to the invention is described in the first invention to the first invention. 7 In any of the inventions, the excavation step is characterized by comprising a beam installation step of installing a beam inside the cylindrical wall after excavating to a predetermined depth.

[0012] The 9 The construction method for underground structures according to the invention is described in the first invention to the first invention. 8 In any of the inventions, the excavation step is characterized by comprising: a water collection pipe installation step of installing a water collection pipe extending toward the outside of the cylindrical wall; and a drain pipe installation step of installing a drain pipe extending toward the outside of the cylindrical wall at the lower end of the cylindrical wall.

[0013] The 10 The construction method for underground structures according to the invention is described in the first invention to the first invention. 9 In any of the inventions, the side wall member is characterized by being a steel sheet pile.

[0014] The 11 The construction method for underground structures according to the invention is described in the first invention to the first invention. 10 In any of the inventions, the side wall member is characterized by being a steel sheet pile with a plate thickness of 10 mm or less.

[0015] The 12 The construction method for underground structures according to the invention is described in the first invention to the first invention. 11 In any of the inventions, the side wall member is characterized by being a sheet pile made of stainless steel. [Effects of the Invention]

[0016] First Invention ~ 12According to the invention, a side wall member having a longitudinal direction in the vertical direction and joint portions formed at both end portions in the short direction is held in a state of standing upright with respect to the ground, and one joint portion of the held side wall member and the other joint portion of another side wall member different from the side wall member are connected, and a cylindrical wall body standing construction step of standing a cylindrical wall body formed by a plurality of side wall members on the ground is provided. Thereby, even when the cylindrical wall body does not form a closed cross-section in plan view due to an error in the arrangement position of the side wall member, a manufacturing error, etc., the held side wall member can be aligned again, and the cylindrical wall body can be corrected to a closed cross-section in plan view. As a result, construction can be easily performed.

[0017] Also, according to the first invention to the 12 According to the invention, in the cylindrical wall body standing construction step, since a cylindrical cylindrical wall body is erected on the ground, the formed shape of the cylindrical wall body can be confirmed in advance on the ground.

[0018] Also, according to the first invention to the 12 According to the invention, a driving step of sequentially driving a plurality of side wall members constituting the cylindrical wall body into the ground and burying the cylindrical wall body in the ground is provided. Thereby, the side wall member can be quickly driven into the ground by a vibratory pile driver. For this reason, the work of manually connecting the liner plates as in the conventional case can be omitted. Further, due to the driving by the vibratory pile driver, the load on the operator can be reduced, and labor saving can be achieved. For this reason, construction can be easily performed.

[0019] Also, according to the first invention to the 12 According to the invention, after the cylindrical wall body standing construction step, a driving step of sequentially driving a plurality of side wall members constituting the cylindrical wall body into the ground and burying the cylindrical wall body in the ground is provided. Thereby, when driving one side wall member, the one side wall member can be driven while sliding it to the joint portions of the other side wall members arranged on both sides. For this reason, it is possible to surely construct a cylindrical wall body having a predetermined shape in the ground. <\

[0020] Also, according to the first invention to the 12According to the invention, after the concrete casting process, an excavation process is included in which the inside of the cylindrical wall is excavated. This prevents the excavation surface from being exposed to the side, thereby suppressing ground collapse. As a result, construction can be carried out safely.

[0021] In particular, the 1 According to the invention, the cylindrical wall erection process involves burying the lower end of the side wall member in the ground to hold the side wall member in an upright position. This stabilizes the side wall member in an upright position relative to the ground. Therefore, even if the cylindrical wall does not form a closed cross-section in plan view due to errors in the placement of the side wall member, manufacturing errors, etc., the side wall member can be pulled out of the ground, repositioned, and the cylindrical wall can be corrected to form a closed cross-section in plan view. As a result, construction can be made easier.

[0022] In particular, the 7 According to the invention, in the cylindrical wall erection process, a guide member is installed in the ground to serve as a guide when casting the side wall members, and in the casting process, the side wall members are cast using the guide member as a guide. This makes it easy to cast the side wall members in the predetermined position. As a result, the accuracy of the shape of the underground structure is improved.

[0023] In particular, the 8 According to the invention, the excavation process includes a beam installation process in which beam members are installed inside the cylindrical wall after excavating to a predetermined depth. body Because it can be reinforced as needed, construction can be carried out even more safely.

[0024] In particular, the 9 According to the invention, the excavation process includes a water collection pipe installation process, in which a water collection pipe extending outward from the cylindrical wall is installed, and a drainage pipe installation process, in which a drainage pipe extending outward from the cylindrical wall is installed at the lower end of the cylindrical wall. This makes it possible to construct an underground structure as a water collection well.

[0025] In particular, the 10According to the invention, the side wall members are steel sheet piles. By using commonly available steel sheet piles, it becomes possible to construct underground structures with members that have stable quality and cross-sectional properties.

[0026] In particular, the 11 According to the invention, the side wall members are lightweight steel sheet piles with a plate thickness of 10 mm or less. As a result, compared to U-shaped steel sheet piles with a plate thickness of more than 10 mm, lightweight steel sheet piles with a plate thickness of 10 mm or less have more clearance at the joints and a larger rotational angle at the joints. Therefore, when constructing a cylindrical wall body that has a closed cross-section in plan view, it becomes easier to assemble. In addition, because the plate thickness of the side wall members is thin, it is easier to drill holes in the cylindrical wall body when boring the ground during the water collection pipe installation process and the drainage pipe installation process.

[0027] In particular, the 12 According to the invention, The aforementioned side wall member is These are sheet piles made of stainless steel. This improves corrosion resistance and reduces the life cycle cost of underground structures. [Brief explanation of the drawing]

[0028] [Figure 1] Figure 1 is a partially broken front view showing an example of an underground structure in the first embodiment. [Figure 2] Figure 2 is a plan view showing an example of an underground structure in the first embodiment. [Figure 3] Figure 3 is a front view showing the cylindrical wall erection process, which is an example of a construction method for underground structures in the first embodiment. [Figure 4] Figure 4 is a perspective view showing the cylindrical wall erection process, which is an example of a construction method for underground structures in the first embodiment. [Figure 5] Figure 5 is a front view showing the cylindrical wall erection process, which is an example of a construction method for underground structures in the first embodiment. [Figure 6] Figure 6 is a front view showing the pouring process of an example of a construction method for an underground structure in the first embodiment. [Figure 7]Figure 7 is a front view showing the pouring process of an example of a construction method for an underground structure in the first embodiment. [Figure 8] Figure 8 is a partially broken front view showing the excavation process of an example of a construction method for an underground structure in the first embodiment. [Figure 9] Figure 9 is a partially broken front view showing the excavation process of an example of a construction method for an underground structure in the first embodiment. [Figure 10] Figure 10 is a side view showing the cylindrical wall erection process, which is an example of a construction method for underground structures in the second embodiment. [Figure 11] Figure 11 is a front view showing the pouring process of an example of a construction method for an underground structure in the third embodiment. [Figure 12] Figure 12 is a front view showing the pouring process of an example of a construction method for an underground structure in the third embodiment. [Modes for carrying out the invention]

[0029] The following describes in detail, with reference to the drawings, embodiments for implementing the construction method of underground structures to which the present invention is applied.

[0030] (First Embodiment) Figure 1 is a partially broken front view showing an example of the underground structure 100 in the first embodiment. Figure 2 is a plan view showing an example of the underground structure 100 in the first embodiment.

[0031] The underground structure 100 may be used, for example, as a water collection well. The underground structure 100 may also be used as a deep foundation pile, an underwater temporary cofferdam, a bridge pier, etc.

[0032] The underground structure 100 includes a cylindrical wall 10 buried underground. The underground structure 100 may further include a beam 2, a water collection pipe 3, and a drainage pipe 4.

[0033] The cylindrical wall 10 is formed in a cylindrical or other tubular shape by connecting a plurality of side wall members 1 in the circumferential direction.

[0034] The side wall member 1 is, for example, a hat-shaped steel sheet pile. The side wall member 1 is formed in a rectangular shape when viewed from the front. The side wall member 1 has its longitudinal direction in the vertical direction, and joint portions 11 and 12 are formed at both ends in the short direction.

[0035] The side wall member 1 is preferably a steel sheet pile with a plate thickness of 10 mm or less. Furthermore, the side wall member 1 is preferably a stainless steel sheet pile.

[0036] For example, an H-shaped steel beam may be used for beam member 2. Beam member 2 reinforces the cylindrical wall body 10 and is installed inside the cylindrical wall body 10. Beam member 2 is arranged along the inner circumferential surface of the cylindrical wall body 10. A rectangular steel pipe or the like may also be used for beam member 2.

[0037] The water collection pipe 3 is formed to extend outward from the cylindrical wall 10 and is buried underground. The water collection pipe 3 is a known piping material, such as a polyvinyl chloride pipe. The water collection pipe 3 is arranged to slope downward as it approaches the cylindrical wall 10. The water collection pipe 3 collects rainwater, groundwater, etc., from the ground outside the cylindrical wall 10 and brings it inside the cylindrical wall 10. Multiple water collection pipes 3 are arranged spaced apart in the vertical direction.

[0038] The drain pipe 4 is formed to extend outward from the cylindrical wall 10 and is buried underground. The drain pipe 4 is installed at the lower end of the cylindrical wall 10. The drain pipe 4 is a known piping material, such as a steel pipe. The drain pipe 4 drains the water collected inside the cylindrical wall 10 to the outside of the cylindrical wall 10.

[0039] Next, an example of a construction method for underground structures in the first embodiment will be described.

[0040] The method for constructing an underground structure is a method for constructing an underground structure 100, comprising a cylindrical wall erection step, a casting step, and an excavation step.

[0041] <Cylindrical wall erection process> The cylindrical wall erection process begins by placing a guide member 5, which serves as a guide when the side wall member 1 is driven into the ground, as shown in Figure 3. The guide member 5 is made of steel plate and has an opening 51 formed within it.

[0042] In the cylindrical wall erection process, as shown in Figures 4 and 5, the lower end 1a of the side wall member 1 is embedded in the ground using a vibratory pile driver suspended from a crane (not shown), while the outer surface of the side wall member 1 is in contact with the inner surface of the opening 51 of the guide member 5. The vibratory pile driver is then removed from the side wall member 1, and the side wall member 1 is held upright relative to the ground. At this time, the central part between the lower end 1a and the upper end 1b of the side wall member 1 is exposed above ground.

[0043] In the cylindrical wall erection process, the joint portion 11 of a side wall member 1, whose lower end 1a is embedded and held in the ground, is connected to the joint portion 12 of another side wall member 1 different from the said side wall member 1, and the lower end 1a of the other side wall member 1 is embedded and held in the ground. The holding of the side wall member 1 and the connection of the joint portion 11 of the held side wall member 1 to the joint portion 12 of the other side wall member 1 are repeated until a cylindrical wall 10, formed by multiple side wall members 1, is erected on the ground.

[0044] In this way, during the cylindrical wall erection process, a side wall member 1, with its longitudinal direction being vertical and joint portions 11 and 12 formed at both ends in the short direction, is held upright relative to the ground. One joint portion 11 of the held side wall member 1 is connected to the other joint portion 12 of another side wall member 1 that is different from the side wall member 1, thereby erecting a cylindrical wall 10 formed by multiple side wall members 1 on the ground. The cylindrical wall 10 is upright relative to the ground because the lower end portion 1a of the side wall member 1 is buried in the ground.

[0045] As a result, even if the cylindrical wall body 10 does not form a closed cross-section in plan view due to errors in the placement of the side wall member 1, manufacturing errors, etc., the held side wall member 1 can be pulled out of the ground and repositioned to correct the cylindrical wall body 10 to a closed cross-section in plan view.

[0046] <Concrete pouring process> Next, in the driving process, as shown in Figures 6 and 7, a vibrating pile driver suspended from a crane (not shown) sequentially drives multiple side wall members 1 that make up the cylindrical wall 10 into the ground, thereby burying the cylindrical wall 10 in the ground.

[0047] As shown in Figure 6, the joint portion 11 of one side wall member 1 that is driven into the ground is connected to the joint portion 12 of another side wall member 1 adjacent to that side wall member 1. Similarly, the joint portion 12 of one side wall member 1 that is driven into the ground is connected to the joint portion 11 of another side wall member 1 adjacent to that side wall member 1. In other words, one side wall member 1 that is driven into the ground is embedded in the ground while sliding against the joint portions 11 and 12 of the other side wall members 1 on both sides. At this time, the central portion between the lower end portion 1a and the upper end portion 1b of the side wall member 1 is embedded in the ground. The upper end portion 1b of the side wall member 1 may be embedded in the ground or may be slightly exposed above ground.

[0048] In the casting process, the side wall member 1 is guided by the guide member 5 and cast into the ground. In the casting process, the side wall member 1 is cast while the outer surface of the side wall member 1 is in contact with the inner surface of the opening 51.

[0049] Then, as shown in Figure 7, during the casting process, all the side wall members 1 constituting the cylindrical wall 10 are buried in the ground. After burying the cylindrical wall 10 in the ground during the casting process, the guide members 5 are removed.

[0050] <Excavation Process> Next, in the excavation process, the inside of the cylindrical wall 10 is excavated as shown in Figures 8 and 9. The excavation process includes a beam installation process, a water collection pipe installation process, and a drainage pipe installation process.

[0051] As shown in Figure 8, the excavation process includes a beam installation step in which beam members 2 are installed inside the cylindrical wall 10 after excavating to a predetermined depth. This allows the cylindrical wall 10 to be reinforced.

[0052] As shown in Figure 9, the excavation process includes a water collection pipe installation process in which, after excavating to a predetermined depth or after the excavation is completed, a water collection pipe 3 extending outward from the cylindrical wall 10 is installed. The water collection pipe installation process involves creating holes in the cylindrical wall 10 and the ground by boring or the like, and then installing the water collection pipe 3 into the created holes.

[0053] The excavation process includes a drain pipe installation process, after the excavation is completed, in which a drain pipe 4 extending outward from the cylindrical wall 10 is installed at the lower end of the cylindrical wall 10. The drain pipe installation process involves creating holes in the cylindrical wall 10 and the ground by boring or the like, and then installing the drain pipe 4 into the created holes.

[0054] This concludes one example of a construction method for underground structures.

[0055] According to this embodiment, a side wall member 1, with its longitudinal direction in the vertical direction and joint portions 11 and 12 formed at both ends in the short direction, is held upright relative to the ground. One joint portion 11 of the held side wall member 1 is connected to the other joint portion 12 of another side wall member 1 different from the said side wall member 1, thereby erecting a cylindrical wall body 10 formed by multiple side wall members 1 on the ground. As a result, even if the cylindrical wall body 10 does not have a closed cross-section in plan view due to errors in the placement of the side wall members 1, manufacturing errors, etc., the held side wall members 1 can be repositioned and the cylindrical wall body 10 can be corrected to have a closed cross-section in plan view. Consequently, construction can be easily carried out.

[0056] Furthermore, according to this embodiment, the cylindrical wall erection process involves erecting a cylindrical wall 10 on the ground, so the completed shape of the cylindrical wall 10 can be confirmed on the ground in advance.

[0057] Furthermore, according to this embodiment, the method includes a driving step in which a plurality of side wall members 1 constituting the cylindrical wall body 10 are sequentially driven into the ground, thereby burying the cylindrical wall body 10 in the ground. This allows the side wall members 1 to be quickly driven into the ground using a vibratory pile driver. As a result, the conventional work of manually connecting liner plates can be omitted. In addition, because the driving is done using a vibratory pile driver, the burden on the workers is reduced, and labor is saved. As a result, construction can be carried out easily.

[0058] Furthermore, according to this embodiment, both the crane and the vibratory pile driver are generally available, and construction can be carried out without the need for special equipment such as a silent piler. Therefore, there are fewer constraints during construction, and the versatility of construction can be improved.

[0059] Furthermore, according to this embodiment, after the cylindrical wall erection process, a casting process is included in which a plurality of side wall members 1 constituting the cylindrical wall 10 are sequentially cast into the ground, thereby burying the cylindrical wall 10 in the ground. This allows one side wall member 1 to be cast while sliding it against the joint portions 11 and 12 of the other side wall members 1 arranged on both sides. As a result, it becomes possible to reliably construct a cylindrical wall 10 of a predetermined shape in the ground.

[0060] Furthermore, according to this embodiment, an excavation step is provided after the concrete casting step, in which the inside of the cylindrical wall 10 is excavated. This prevents the excavated surface from being exposed to the side, thereby suppressing ground collapse. As a result, construction can be carried out safely.

[0061] According to this embodiment, the cylindrical wall erection process involves burying the lower end portion 1a of the side wall member 1 in the ground to hold the side wall member 1 in an upright position. This stabilizes the side wall member 1 in an upright position relative to the ground. Therefore, even if the cylindrical wall 10 does not have a closed cross-section in plan view due to errors in the placement of the side wall member 1, manufacturing errors, etc., the side wall member 1 can be pulled out of the ground, repositioned, and the cylindrical wall 10 can be corrected to have a closed cross-section in plan view. As a result, construction can be easily carried out.

[0062] According to this embodiment, in the cylindrical wall erection process, a guide member 5 is installed to serve as a guide when casting the side wall member 1, and in the casting process, the side wall member 1 is cast using the guide member 5 as a guide. This makes it easy to cast the side wall member 1 in a predetermined position. As a result, the accuracy of the shape of the underground structure 100 is improved.

[0063] According to this embodiment, the excavation process includes a beam installation process in which, after excavating to a predetermined depth, beam members 2 are installed inside the cylindrical wall 10. This allows the cylindrical wall 10 to be reinforced as appropriate, making construction even safer.

[0064] According to this embodiment, the excavation process includes a water collection pipe installation process in which a water collection pipe 3 extending outward from the cylindrical wall 10 is installed, and a drainage pipe installation process in which a drainage pipe 4 extending outward from the cylindrical wall 10 is installed at the lower end of the cylindrical wall 10. This makes it possible to construct the underground structure 100 as a water collection well.

[0065] According to this embodiment, the side wall member 1 is a steel sheet pile. By using a commonly available steel sheet pile, it is possible to construct the underground structure 100 with a member that has stable quality and cross-sectional performance.

[0066] According to this embodiment, the side wall member 1 is a lightweight steel sheet pile with a plate thickness of 10 mm or less. Compared to U-shaped steel sheet piles with a plate thickness exceeding 10 mm, lightweight steel sheet piles with a plate thickness of 10 mm or less have more clearance at the joint and a larger rotational angle at the joint. Therefore, when constructing the cylindrical wall body 10 which has a closed cross-section in plan view, it becomes easier to assemble. In addition, because the plate thickness of the side wall member 1 is thin, it is easier to drill holes in the cylindrical wall body 10 when boring the ground in the water collection pipe installation process and the drainage pipe installation process.

[0067] According to this embodiment, the sheet pile is made of stainless steel. This improves corrosion resistance and makes it possible to reduce the life cycle cost of the underground structure 100.

[0068] (Second Embodiment) Next, an example of a construction method for underground structures in the second embodiment will be described. Detailed explanations of configurations similar to those in the first embodiment will be omitted below.

[0069] The method for constructing an underground structure is a method for constructing an underground structure 100, comprising a cylindrical wall erection step, a casting step, and an excavation step.

[0070] <Cylindrical wall erection process> The process of erecting the cylindrical wall body begins by placing a holding member 6 on the ground to maintain the upright position of the side wall member 1, as shown in Figure 10. The holding member 6 is formed, for example, in an L-shape in cross-section and has a bottom plate portion 61 that extends along the ground and a plate-shaped guide member 62 that rises from the bottom plate portion 61.

[0071] In the cylindrical wall erection process, a pair of holding members 6 are placed on the ground spaced apart from each other. Then, in the cylindrical wall erection process, a side wall member 1 is positioned between the pair of holding members 6, and the holding members 6 hold the side wall member 1 upright relative to the ground. The side wall member 1 is held upright relative to the ground by being sandwiched between the pair of holding members 6. At this time, the lower end 1a of the side wall member 1 may be placed on the ground or buried in the ground. Also, the central part between the lower end 1a and the upper end 1b of the held side wall member 1 is exposed above ground.

[0072] Then, in the cylindrical wall erection process, the cylindrical wall 10 is erected on the ground using multiple side wall members 1.

[0073] <Concrete pouring process> Subsequently, during the casting process, the side wall member 1 is guided by the guide member 62 of the holding member 6 and cast into the ground. During the casting process, the side wall member 1 is cast while its inner and outer surfaces are in contact with the pair of guide members 62.

[0074] Then, in the casting process, all the side wall members 1 that make up the cylindrical wall 10 are buried in the ground. In the casting process, after the cylindrical wall 10 is buried in the ground, the retaining members 6 are removed.

[0075] <Excavation Process> Subsequently, similar to the first embodiment, an excavation process is carried out, completing one example of a method for constructing an underground structure.

[0076] According to this embodiment, in the cylindrical wall erection process, the holding member 6 is installed in the ground, and the holding member 6 holds the side wall member 1 upright relative to the ground. This stabilizes the upright position of the side wall member 1. Therefore, even if the cylindrical wall 10 does not have a closed cross-section in plan view due to errors in the placement of the side wall member 1, manufacturing errors, etc., the upright side wall member 1 can be removed from the holding member 6, repositioned, and the cylindrical wall 10 can be corrected to have a closed cross-section in plan view. As a result, construction can be easily carried out.

[0077] According to this embodiment, in the cylindrical wall erection process, a pair of holding members 6 are installed spaced apart from each other, and the side wall member 1 is held upright relative to the ground by being sandwiched between the pair of holding members 6. This further stabilizes the upright position of the side wall member 1.

[0078] According to this embodiment, in the casting process, the side wall member 1 is cast while its inner and outer surfaces are in contact with a pair of guide members 62. This makes it even easier to cast the side wall member 1 in a predetermined position. As a result, the accuracy of the shape of the underground structure 100 is further improved.

[0079] (Third embodiment) Next, an example of a construction method for underground structures in the third embodiment will be described.

[0080] <Cylindrical wall erection process> In the construction method for underground structures, the cylindrical wall erection process is carried out in the same manner as in the first embodiment.

[0081] <Concrete pouring process> In the driving process, as shown in Figure 11, after driving in one side wall member 1, a longitudinal joint side wall member 1' is placed above the first side wall member 1. The longitudinal joint side wall member 1' is the same as the side wall member 1. For example, a hat-shaped steel sheet pile is used for the longitudinal joint side wall member 1'. The longitudinal joint side wall member 1' is formed in a rectangular shape when viewed from the front. The longitudinal joint side wall member 1' has its longitudinal direction in the vertical direction, and joint portions 11' and 12' are formed at both ends in the short direction.

[0082] Then, in the driving process, as shown in Figure 12, the side wall member 1 and the longitudinally joining side wall member 1' are joined longitudinally by welding a backing plate 13 to them. In the driving process, after the side wall member 1 and the longitudinally joining side wall member 1' are joined longitudinally, the longitudinally joining side wall member 1' may be driven in using a vibratory pile driver if necessary.

[0083] <Excavation Process> Subsequently, similar to the first embodiment, an excavation process is carried out, completing one example of a method for constructing an underground structure.

[0084] According to this embodiment, in the concrete casting process, after casting one side wall member 1, a vertical joint side wall member 1' is vertically joined above the first side wall member 1. This ensures that the embedment length into the ground is secured by the vertical joint side wall member 1' when the length of the side wall member 1 is shorter than the design depth of the underground structure 100. Furthermore, the joint portions 11' and 12' of the vertical joint side wall member 1' can slide against the joint portions 11 and 12 of the other side wall members 1 adjacent to them on both sides. Therefore, the vertical joint side wall member 1' does not wobble when positioned above the side wall member 1, making it easy to align it with the lower side wall member 1 to which it is vertically joined.

[0085] While embodiments of this invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, this invention can be implemented in various novel forms in addition to the embodiments described above. For example, in the embodiments described above, the cylindrical wall 10 is circular in plan view, but its shape is not limited to oval, horseshoe, rectangular, etc. Therefore, the embodiments described above can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the invention described in the claims and its equivalents. [Explanation of symbols]

[0086] 100: Underground structure 10: Cylindrical wall 1: Side wall member 1a: Bottom end 1b: Upper end 11: Joint section 12: Joint section 1': Side wall member for vertical joint 11': Joint section 12': Joint section 13: Backing plate 2: Beam material 3: Water collection pipe 4: Drain pipe 5: Guide member 51: Opening 6: Retaining member 61:Bottom plate part 62: Guide member

Claims

1. A method for constructing underground structures, A cylindrical wall erection step involves holding a side wall member, with its longitudinal direction being vertical and joints formed at both ends in the short direction, in an upright position relative to the ground, connecting one joint of the held side wall member to the other joint of another side wall member different from the said side wall member, and erecting a cylindrical wall body formed by a plurality of the side wall members on the ground. A casting step is to sequentially cast the multiple side wall members constituting the cylindrical wall into the ground, thereby burying the cylindrical wall in the ground. The process includes an excavation step of excavating the inside of the cylindrical wall, In the process of erecting the cylindrical wall, The side wall member is driven into the ground using a vibratory pile driver, and the lower end of the side wall member is buried in the ground. The vibrating pile driver is separated from the side wall member, and the side wall member is held upright relative to the ground. A construction method for underground structures characterized by the following.

2. In the process of erecting the cylindrical wall, The retaining member is installed on the ground surface, The lower end of the side wall member is buried in the ground, and the holding member holds the side wall member upright relative to the ground. A method for constructing an underground structure according to claim 1, characterized by the above.

3. The holding member comprises a bottom plate portion and a guide member that rises from the bottom plate portion, In the process of erecting the cylindrical wall, the bottom plate is placed on the ground surface, and the side wall members are held in place by the guide members. A method for constructing an underground structure according to claim 2, characterized by the above.

4. In the process of erecting the cylindrical wall, a plate-shaped guide member having an opening is installed on the ground surface of the ground, In the casting process, the outer surface of the side wall member is guided by the inner circumferential surface of the opening to cast the side wall member. A method for constructing an underground structure according to claim 1, characterized by the above.

5. A method for constructing an underground structure, A cylindrical wall erection step involves holding a side wall member, with its longitudinal direction being vertical and joints formed at both ends in the short direction, in an upright position relative to the ground, connecting one joint of the held side wall member to the other joint of another side wall member different from the said side wall member, and erecting a cylindrical wall body formed by a plurality of the side wall members on the ground. A casting step is to sequentially cast the multiple side wall members constituting the cylindrical wall into the ground, thereby burying the cylindrical wall in the ground. The process includes an excavation step of excavating the inside of the cylindrical wall, In the process of erecting the cylindrical wall, A retaining member is installed on the ground surface of the ground, the lower end of the side wall member is placed on the ground, and the side wall member placed on the ground is held upright relative to the ground by the retaining member. A construction method for underground structures characterized by the following.

6. The holding member comprises a bottom plate portion and a guide member that rises from the bottom plate portion, In the process of erecting the cylindrical wall, the bottom plate is placed on the ground surface, and the side wall members are held in place by the guide members. A method for constructing an underground structure according to claim 5, characterized by the above.

7. In the process of erecting the cylindrical wall, a guide member is installed in the ground to serve as a guide when the side wall member is cast into place. In the casting process, the side wall member is guided by the guide member and cast. A method for constructing an underground structure according to claim 1 or 5, characterized by the above.

8. The excavation process includes a beam installation process in which, after excavating to a predetermined depth, beam members are installed inside the cylindrical wall. A method for constructing an underground structure according to any one of claims 1 to 7, characterized by the above.

9. The aforementioned excavation process is, A water collection pipe installation step involves installing a water collection pipe that extends outward toward the outside of the cylindrical wall body, The process includes a drain pipe installation step of installing a drain pipe extending outward from the cylindrical wall at the lower end of the cylindrical wall. A method for constructing an underground structure according to any one of claims 1 to 8, characterized by the above.

10. The side wall member is a steel sheet pile. A method for constructing an underground structure according to any one of claims 1 to 9, characterized by the above.

11. The side wall member is a steel sheet pile with a thickness of 10 mm or less. A method for constructing an underground structure according to any one of claims 1 to 10, characterized by the above.

12. The side wall member is a sheet pile made of stainless steel. A method for constructing an underground structure according to any one of claims 1 to 11, characterized by the above.

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