Construction machine of water-shielding structure and press-fitting machine

Abstract

To provide a construction method of a water-shielding structure which improves workability.SOLUTION: A construction method of a water-shielding structure includes: a bonding step of bonding a double-sided tape 8 onto the end surface or the rear face of a water-shielding sheet 7B of one multilayer integrated water-shielding sheet 3 of adjacent multilayer integrated water-shielding sheets 3 and 3, on land or board; a setting step of setting the adjacent multilayer integrated water-shielding sheets 3 and 3 in sea in a control type maritime disposal station; and a press-fitting step of pressing ends of the water-shielding sheets 7B and 7B where the adjacent multilayer integrated water-shielding sheets 3 and 3 overlap each other, while peeling a release sheet of the double-sided tape 8 bonded to the water-shielding sheet 7B of the one multilayer integrated water-shielding sheet 3. Thereby, workability can be improved.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a construction method for a waterproof structure, in which a waterproof structure is laid on at least the side of a revetment within a managed sea surface disposal site, the waterproof structure being made by alternately stacking protective mats and waterproof sheets made of different materials and connecting the ends of the multi-layer integrated waterproof sheet to which the mats are welded, and a crimping machine used in the construction method. [Background technology]

[0002] Municipal waste, industrial waste such as incineration ash and coal ash, and other waste are landfilled in managed offshore landfills, for example. Managed offshore landfills are constructed by laying impermeable structures, including waterproof sheets and protective mats, on the sides of the sloped or composite embankments that define the area as a managed offshore landfill, and on the seabed within the site, to prevent water from leaking outside the site. Legal requirements require that the waterproof sheets be installed in duplicate. This is based on a fail-safe design concept: even if one waterproof sheet is damaged by waste dumped as landfill material, as long as the other waterproof sheet remains intact, potentially contaminated waste and the water it comes into contact with can be prevented from leaking outside the site.

[0003] Crushed stone and other materials are placed on top of these two waterproof sheets to prevent them from floating up. The first waterproof sheet, located on the dike side, is subject to relatively large external forces, such as wave pressure from outside the dike and hydrostatic pressure due to the difference in water level between the inside and outside of the dike, so a thick layer of crushed stone and other weights is placed on top. On the other hand, the second waterproof sheet, which is laid inside the dike, is not subject to large uplift forces, so in many cases the crushed stone cross section on the second waterproof sheet is a thin layer, about 1m thick. The reason for installing the two waterproof sheets separately is that even if a small leak occurs in one of the waterproof sheets due to uncertainties during construction, as long as the separately installed waterproof sheet is able to seal it off, there will be no impact on the area outside the managed offshore disposal site.

[0004] Furthermore, if waste materials deposited in a managed offshore landfill site, such as rebar, steel frames, or concrete fragments, could potentially damage the second waterproof sheet laid inside the dike, leakage outside the site will be prevented if the first waterproof sheet underneath the second is intact. In recent years, construction reliability has improved as construction experience has grown. Therefore, in managed offshore landfills that landfill waste materials, such as coal ash, that are unlikely to damage the waterproof sheet, a double waterproof sheet is now being installed as an integrated unit. Therefore, a protective mat is placed on the underside of the installed waterproof sheet to prevent damage from the base material placed on the surface on which the waterproof sheet is laid. A protective mat is also placed on the top surface of the waterproof sheet to prevent damage from the loading material placed on top of the waterproof sheet.

[0005] In order to integrate the double waterproof sheet, it is necessary to integrate the upper and lower protective mats as well. Referring to Figure 2, a multi-layer integrated waterproof sheet 3 is used, which, when laid, has a five-layer structure consisting of, from top to bottom, protective mat 6A, waterproof sheet 7A, protective mat 6B, waterproof sheet 7B, and protective mat 6C. This multi-layer integrated waterproof sheet 3 is placed in the same position as the first waterproof sheet, and thick crushed stone or the like is placed therein to provide a large load that can withstand the uplift force caused by wave pressure and hydrostatic pressure. This eliminates the risk of damage to the multi-layer integrated waterproof sheet 3, even if rebar or the like is buried in the ground. The use of this multi-layer integrated waterproof sheet 3 reduces material costs and installation labor, making this type of waterproof structure desirable in the future.

[0006] To manufacture the above-mentioned multilayer integrated waterproof sheet 3, first, waterproof sheets 7A, 7B and protective mats 6A, 6B, and 6C are manufactured as raw rolls approximately 2 m wide at their respective manufacturing plants. Next, at a processing plant, strip-shaped waterproof sheets 7A, 7B and protective mats 6A, 6B, and 6C are unwound from the raw rolls of waterproof sheets 7A, 7B and protective mats 6A, 6B, and 6C, and the layers of protective mat 6A / waterproof sheet 7A / protective mat 6B / waterproof sheet 7B / protective mat 6C are partially welded from above (see FIG. 2), thereby manufacturing a raw roll of multilayer integrated waterproof sheet 3 (2 m wide), (see also FIG. 3). This multilayer integrated waterproof sheet 3 is then wound into a roll and packaged.

[0007] Then, a packing roll of multiple multi-layer integrated waterproof sheets 3 is transported to a processing factory or a managed offshore disposal site, and as shown in Figure 3, at a land yard near the installation site or on a large outfitted ship, the widthwise ends of the strip-shaped multi-layer integrated waterproof sheets 3, 3 are connected together by welding while each layer is overlapped, thereby widening the sheet into a large panel-shaped (approximately rectangular) partial waterproof structure 4 approximately 6 to 30 m wide (see also Patent Document 1).

[0008] 22 and 23, conventionally, a plurality of these partial waterproof structures 4, 4, with numerous floating devices 90, 90 attached, are pulled out onto the sea surface in the managed offshore disposal site 5, and each partial waterproof structure 4, 4 is temporarily placed in a floating mooring on the sea surface by each floating device 90, 90, and the widthwise ends of adjacent partial waterproof structures 4, 4 are further welded to each other on the sea surface, i.e., in the seawall or on an offshore welding barge. Thereafter, referring to Figures 23 and 24, until a single waterproof structure 1 (sheet) covering the entire target area is formed, it is in a floating mooring state by the numerous floating devices 90, 90, and after forming a single waterproof structure 1, it is finally sunk and laid on the side of the seawall and on the seabed of the managed offshore disposal site 5 while the numerous floating devices 90, 90 are removed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 6990625 Summary of the Invention [Problem to be solved by the invention]

[0010] 2, 3, 23, and 24, in the past, after multiple partial waterproof structures 4, 4 were pulled out above sea level and the ends of adjacent partial waterproof structures 4, 4 were welded together, the period until they were submerged as a single waterproof structure 1 could be about one month or more, and if high waves hit during this period, the partial waterproof structures 4, 4 could be washed up onto the seawall or otherwise damaged. In this way, when multiple partial waterproof structures 4, 4 will be floating and moored for a long period of time, one method is to temporarily submerge them, including the ends of the waterproof sheets 7A, 7B of the multiple partial waterproof structures 4, 4 (composed of multiple connected multilayer integrated waterproof sheets 3, 3). However, when connecting the waterproof sheets 7A, 7B of adjacent partial waterproof structures 4, 4, it is necessary to re-float the ends of the waterproof sheets 7A, 7B of the submerged partial waterproof structures 4, 4, which requires considerable effort, deteriorates workability, and extends the construction period.

[0011] The present invention has been made in view of the above points, and aims to provide a construction method and crimping machine for a waterproof structure that improves workability. [Means for solving the problem]

[0012] As a means for solving the above problem, the invention relating to the construction method for a waterproof structure of claim 1 is a construction method for laying a waterproof structure, which is made by alternately stacking protective mats and waterproof sheets made of different materials and connecting the ends of the multi-layer integrated waterproof sheet to which they are welded, on at least the side of a revetment within a managed offshore disposal site, and is characterized by including the following steps: an attachment step, on land or on a ship, of attaching double-sided tape to the front or back surface of the end of the waterproof sheet of one of adjacent multi-layer integrated waterproof sheets; a sinking step of sinking the adjacent multi-layer integrated waterproof sheet in the sea within the managed offshore disposal site; and a pressing step of pressing the ends of the overlapping waterproof sheets of the adjacent multi-layer integrated waterproof sheets together while peeling off the release sheet of the double-sided tape attached to the waterproof sheet of one of the multi-layer integrated waterproof sheets. In the invention of claim 1, in particular, the sinking step and the crimping step can be carried out, which makes it possible to suppress damage caused by high waves, etc., improve workability, and ultimately shorten the construction period.

[0013] The invention relating to the construction method of a waterproof structure of claim 2 is the invention of claim 1, wherein in the crimping step, a crimping machine is used to crimp the ends of the overlapping waterproof sheets of the adjacent multi-layer integrated waterproof sheets, and the crimping machine is equipped with an upper roller that rolls on the upper surface of the waterproof sheet of the upper multi-layer integrated waterproof sheet, and a lower roller that rolls on the lower surface of the waterproof sheet of the lower multi-layer integrated waterproof sheet, and the upper roller and the lower roller are configured to be able to move towards and away from each other. Furthermore, when each multi-layer integrated waterproof sheet is laid on the side of the seawall (and the seabed) within a managed sea surface disposal site and the ends of the waterproof sheets of each multi-layer integrated waterproof sheet are pressed together using double-sided tape, it is necessary to press the ends of the waterproof sheets of each multi-layer integrated waterproof sheet together, but since the side of the seawall (and the seabed) on which the sheets are laid are made of backfill stone or crushed stone, etc., and have an uneven, uneven surface, this cannot be used as a reaction force to press the seabed. In view of these circumstances, the invention of claim 2 uses a crimping machine in the crimping step, which is equipped with an upper roller that rolls on the upper surface of the waterproof sheet of the upper multi-layer integrated waterproof sheet, and a lower roller that rolls on the lower surface of the waterproof sheet of the lower multi-layer integrated waterproof sheet, and the upper roller and lower roller are configured to be able to move towards and away from each other freely, so that even if the side of the revetment (and the seabed surface) is made up of backfill stone or crushed stone, etc., it is possible to easily crimp the ends of the waterproof sheets of each multi-layer integrated waterproof sheet together.

[0014] The invention relating to the crimping machine of claim 3 is a crimping machine that crimps the ends of overlapping waterproof sheets together underwater using double-sided tape, and is characterized in that it is equipped with an upper roller that rolls on the upper surface of the upper waterproof sheet and a lower roller that rolls on the lower surface of the lower waterproof sheet, and the upper roller and the lower roller are configured to be able to move towards and away from each other. In the invention of claim 3, even if the surface on which each waterproof sheet is laid is uneven, the ends of each waterproof sheet can be easily pressed together.

[0015] The invention relating to the crimping machine of claim 4 is the invention of claim 3, characterized in that it is provided with a pair of peeling rollers that rotate relative to each other as the upper and lower rollers rotate, thereby sandwiching the release sheet of the double-sided tape and peeling it off from the adhesive layer, and the pair of peeling rollers are positioned further forward in the direction of travel of the crimping machine than the pair of upper and lower rollers. In the invention of claim 4, the pair of peeling rollers are positioned forward of the pair of upper and lower rollers in the direction of travel of the crimping machine, so that before the upper and lower rollers press the ends of the overlapping waterproof sheets together underwater with double-sided tape, the release sheet can be sandwiched between the pair of peeling rollers and easily peeled off from the adhesive layer of the double-sided tape.

[0016] The invention relating to the pressure bonding machine of claim 5 is characterized in that, in the invention of claim 4, a slippage prevention means is provided between the pair of peeling rollers to prevent the release sheet from slipping when the pair of peeling rollers rotate relative to each other. The invention relating to the crimping machine of claim 6 is characterized in that, in the invention of claim 5, the slippage control means comprises a number of protrusions provided on the outer peripheral surface of one of the pair of peeling rollers, and a number of receiving portions provided on the outer peripheral surface of the other peeling roller, which receive each of the protrusions of the one peeling roller. In the inventions of claims 5 and 6, even if the pair of peeling rollers rotate relative to one another, the slippage prevention means prevents the release sheet from slipping between the pair of peeling rollers, and the release sheet can be easily captured between the pair of peeling rollers, thereby ensuring that the release sheet can be reliably peeled off from the adhesive layer of the double-sided tape.

[0017] The invention relating to the crimping machine of claim 7 is the invention of claim 3, characterized in that it comprises one gripping portion integrally connected to the upper roller side and the other gripping portion integrally connected to the lower roller side, and the upper roller and the one gripping portion, and the lower roller and the other gripping portion are connected so as to be rotatable around a fulcrum and able to move towards or away from each other. In the invention of claim 7, when using a crimping machine to crimp the ends of each waterproof sheet together with double-sided tape, an operator can easily crimp the ends of each waterproof sheet together by grasping a pair of gripping parts of the crimping machine and bringing them close to each other, and bringing a pair of upper and lower rollers close to each other.

[0018] The invention relating to claim 8 of the crimping machine is characterized in that, in the invention of claim 7, the gripping portion is formed in a ring shape. In the invention of claim 8, the pair of gripping parts are formed in a ring shape, so that the operator can easily insert his fingers into the pair of gripping parts and operate the crimping machine, making it easy to operate. As a result, the workability when crimping each waterproof sheet with double-sided tape is further improved. [Effects of the Invention]

[0019] According to the construction method for a waterproof structure of the present invention, it is possible to improve the workability when laying a waterproof structure formed by connecting the ends of each multilayer integrated waterproof sheet on at least the side of a revetment within a managed marine disposal site, and the workability can be further improved by the crimping machine used in the construction method. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing a state in which a waterproof structure is laid on the side of a revetment and on the seabed in a controlled sea surface disposal site. [Figure 2] Figure 2 is a cross-sectional view of a multi-layer integrated waterproof sheet. [Figure 3] FIG. 3 is a perspective view of the partial waterproof structure. [Figure 4] FIG. 4 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 5] FIG. 5 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 6] FIG. 6 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 7] FIG. 7 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 8]FIG. 8 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 9] FIG. 9 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 10] FIG. 10 is a perspective view showing a construction method for laying a waterproof structure on the side of a revetment and on the seabed in a managed sea surface disposal site in a step-by-step manner according to this embodiment. [Figure 11] FIG. 11 is a perspective view including a cross section of a double-sided tape that is applied to a construction method for laying a waterproof structure on the side of a revetment and the seabed in a managed sea surface disposal site according to this embodiment. [Figure 12] FIG. 12 is a perspective view of the crimping machine according to this embodiment. [Figure 13] FIG. 13 is a perspective view showing how one waterproof sheet to be crimped is crimped to another waterproof sheet by the crimping machine according to this embodiment. [Figure 14] FIG. 14 is a perspective view showing how one waterproof sheet to be pressure-bonded and another waterproof sheet to be pressure-bonded are pressure-bonded together by the pressure-bonding machine according to this embodiment. [Figure 15] FIG. 15 is a perspective view of a crimping machine according to another embodiment. [Figure 16] FIG. 16 is a perspective view of a crimping machine according to another embodiment. [Figure 17] FIG. 17 is a perspective view of a crimping machine according to another embodiment. [Figure 18] FIG. 18 is a partially exploded perspective view of components of a crimping machine according to another embodiment. [Figure 19] FIG. 19 is a diagram showing a crimping machine according to another embodiment, illustrating the difference in the outer diameter of the sprocket of the lower roller and the outer diameter of the sprocket of the second peeling roller. [Figure 20] FIG. 20 is a perspective view showing how a release sheet is sandwiched between a pair of peeling rollers of a pressure bonding machine according to another embodiment. [Figure 21]FIG. 21 is a perspective view showing how one waterproof sheet to be pressure-bonded and another waterproof sheet are pressure-bonded together by a pressure-bonding machine according to another embodiment. [Figure 22] FIG. 22 is a perspective view showing a conventional construction method for laying a waterproof structure on the side of a revetment and on the seabed in a controlled sea surface disposal site in stages. [Figure 23] FIG. 23 is a perspective view showing a conventional construction method for laying a waterproof structure on the side of a revetment and on the seabed in a controlled sea surface disposal site in stages. [Figure 24] FIG. 24 is a perspective view showing a conventional construction method for laying a waterproof structure on the side of a revetment and on the seabed in a controlled sea surface disposal site in stages. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1, the waterproof structure 1 is laid on the side of, for example, an inclined embankment or composite embankment (inclined embankment 2 in FIG. 1) that is to be partitioned as a managed sea surface disposal site 5, and on the seabed surface within the managed sea surface disposal site 5. Specifically, with reference to FIGS. 2 and 3, in a land yard (not shown) near the installation site or on a large outfitting ship (not shown), the widthwise ends of a plurality of strip-shaped multilayer integrated waterproof sheets 3, 3 are overlapped and connected with each other to form a panel-shaped (approximately rectangular) partial waterproof structure 4 that secures the desired sheet area.

[0022] 1, a plurality of these partial waterproof structures 4, 4 are pulled out above the sea surface within the managed sea surface disposal site 5, and the widthwise ends of adjacent partial waterproof structures 4, 4 are overlapped and connected to each other, respectively, and laid as a single waterproof structure 1 on the side of the seawall and the seabed within the managed sea surface disposal site 5, i.e., on the side of an inclined embankment or composite embankment (in FIG. 1, inclined embankment 2) and the seabed. In this embodiment, the waterproof structure 1 is laid on the side of the seawall and the seabed within the managed sea surface disposal site 5, but if the seabed is covered with clayey soil and forms a waterproof layer, the waterproof structure 1 is laid only on the side of the seawall within the managed sea surface disposal site 5.

[0023] Referring to FIG. 2, the multilayer integrated waterproof sheet 3 is constructed by welding five layers of protective mat 6A, waterproof sheet 7A, protective mat 6B, waterproof sheet 7B, and protective mat 6C together in an installed state. The protective mats 6A, 6B, and 6C are made of materials such as long-fiber nonwoven fabric, short-fiber nonwoven fabric, and pile-reinforced felt. The waterproof sheets 7A and 7B have the desired waterproofing function and are made of materials such as polyvinyl chloride, polyethylene, and other polymeric materials. The thickness of the waterproof sheets 7A and 7B is set within the range of 1.5 to 10 mm. In this embodiment, the thickness of the waterproof sheets 7A and 7B is 3 to 4 mm.

[0024] As described above, the multi-layer integrated waterproof sheet 3 is formed by joining and integrating the protective mats 6A, 6B, and 6C, which are made of different materials, with the waterproof sheets 7A and 7B by welding the contact surfaces between the waterproof sheets 7A and 7B and the protective mats 6A, 6B, and 6C. The bonding strength is merely sufficient to integrate the protective mats 6A, 6B, and 6C with the waterproof sheets 7A and 7B. As a result, the bonding strength is not strong enough to withstand a large load in the peeling direction, and is not reliable as a long-term bonding strength.

[0025] 3, as described above, in an onshore yard near the installation site or on a large outfitting ship, the widthwise end of one multilayer integrated waterproof sheet 3 and the widthwise end of the other multilayer integrated waterproof sheet 3 are overlapped and connected to each other, and a desired sheet area is secured to form a panel-shaped partial waterproof structure 4. Then, as shown in FIG. 1, these partial waterproof structures 4, 4 are pulled out above the sea surface in the multiple managed offshore disposal site 5, and the widthwise end portions of adjacent partial waterproof structures 4, 4 are connected to each other, and the partial waterproof structure 1 is laid on the side of the inclined embankment 2, composite embankment, etc., and on the seabed of the managed offshore disposal site 5.

[0026] The construction method for this waterproof structure will be described in detail below. First, referring to Fig. 4, an attachment step is carried out. In this attachment step, at an on-land yard near the installation site or on a large outfitting ship, double-sided tape 8 is attached to the widthwise end surfaces (top surfaces) of each of the waterproof sheets 7A, 7B (the second and fourth waterproof sheets 7A, 7B from the top) of the multilayer integrated waterproof sheet 3 of one of the partial waterproof structures 4 in the adjacent (connected) target partial waterproof structures 4. Specifically, the double-sided tape 8 is attached to the widthwise end surfaces of each of the waterproof sheets 7A, 7B of one of the multilayer integrated waterproof sheets 3 over substantially the entire longitudinal area. Note that in this embodiment, the double-sided tape 8 is attached to the widthwise end surfaces of the waterproof sheets 7A, 7B, but the double-sided tape 8 may also be attached to the back surfaces of the widthwise end portions of the waterproof sheets 7A, 7B depending on the condition of the target waterproof sheets 7A, 7B.

[0027] Referring to FIG. 11, the double-sided tape 8 uses a rubber-based adhesive material. The double-sided tape 8 is made of polyethylene foam and includes a pair of supports 9, 9 spaced apart in the width direction, hydrophobic adhesive layers 10, 10 provided on both sides of the supports 9, 9, and release sheets 11, 11 that have been subjected to a release treatment and that cover the pair of adhesive layers 10, 10 arranged in the width direction to protect them. The hydrophobic adhesive layer 10 (hydrophobic adhesive layer) has water-repellent properties such that when the release sheet 11 is peeled off in water and water comes into contact with the adhesive layer 10, it repels water and does not form a water film within a predetermined time. The width of the double-sided tape 8 is appropriately set within a range of 10 to 40 cm.

[0028] In addition, the adjacent target partial waterproof structures 4, 4 are constructed in a submerging step described below, with one partial waterproof structure 4 being pulled out to the sea surface first and submerged until it contacts the side of the revetment and the seabed, and after a certain period of time, the other partial waterproof structure 4 being pulled out to the sea surface and submerged until it contacts the side of the revetment and the seabed, and the double-sided tape 8 may be attached in advance to either the leading or trailing partial waterproof structure 4, 4. However, when the double-sided tape 8 is attached to the trailing other partial waterproof structure 4, if the surface to be bonded of the leading one partial waterproof structure 4 is left exposed on the seabed, marine organisms and the like may adhere to it, making it impossible to attach them tightly, and therefore requiring work such as cleaning.

[0029] In view of these circumstances, in this embodiment, the double-sided tape 8 is affixed to one of the leading partial waterproof structures 4. In short, the double-sided tape 8 may be affixed to either the leading or trailing waterproof structures 4, 4, but it is preferable to take measures such as protecting the area where the double-sided tape 8 of the leading partial waterproof structure 4 is affixed, or the area to be bonded (when the double-sided tape 8 is affixed to the trailing partial waterproof structure 4), with a bag or the like, in order to protect the double-sided tape 8 or to prevent marine organisms from attaching to the area to be bonded.

[0030] Next, a sinking step is performed. In this sinking step, one of the adjacent target partial waterproof structures 4, 4 is first pulled out above the sea surface within the managed offshore disposal site 5 and sunk into the sea, i.e., until it contacts the side of the revetment and the seabed, and after a certain period of time, the other partial waterproof structure 4 is pulled out above the sea surface within the managed offshore disposal site 5 and sunk into the sea, i.e., until it contacts the side of the revetment and the seabed. Next, referring to Figure 5, an operator lifts up the fourth-layer waterproof sheet 7B, the third-layer protective mat 6B, the second-layer waterproof sheet 7A, and the top-layer protective mat 6A located above the bottom-layer protective mat 6C so that the bottom-layer protective mat 6C at the widthwise ends of each partial waterproof structure 4, 4 is exposed, and these are simply secured to prevent them from falling with multiple strings 13, clasp vises 14, or the like. 6, the partial waterproof structures 4, 4 are pulled together so that the widthwise ends of the protective mats 6C, 6C located in the lowest layer of each partial waterproof structure 4, 4 (multilayer integrated waterproof sheets 3, 3) overlap by a predetermined width (for example, about 10 cm), and then connected at predetermined intervals (for example, 50 cm intervals) using a plurality of connecting strings 15 or the like. Next, the fourth-layer waterproof sheets 7B, 7B of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation.

[0031] Next, a first pressure-bonding step is carried out with reference to Figures 7, 13, and 14. In this first pressure-bonding step, when the fourth-layer waterproof sheets 7B, 7B of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation, the widthwise end of the waterproof sheet 7B (fourth layer) of the other (upper) partial waterproof structure 4 (multilayer integrated waterproof sheet 3) overlaps with the widthwise end of the waterproof sheet 7B (fourth layer) of one (lower) partial waterproof structure 4 (multilayer integrated waterproof sheet 3) so as to cover the double-sided tape 8. Next, using a crimping machine 17A, which will be described in detail later, the release sheet 11 of the double-sided tape 8 attached to the waterproof sheet 7B (fourth layer) of one partial waterproof structure 4 (multilayer integrated waterproof sheet 3) is peeled off, as will be described in detail later, and the widthwise ends of the overlapping waterproof sheets 7B, 7B of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are pressed together and laminated together.

[0032] After the first pressure-bonding step, a cavity (not shown) is formed between the pair of supports 9, 9 (adhesive layers 10, 10) of the double-sided tape 8 and between the widthwise ends of the overlapping waterproof sheets 7B, 7B (fourth layer). This cavity is used for a pressure test. This pressure test makes it possible to conduct a quality test on the pressure-bonded area using the double-sided tape 8.

[0033] First, the configuration of the crimping machine 17A according to this embodiment and the crimping method thereof will be described in detail with reference to FIGS. Referring to Figure 12, the crimping machine 17A comprises an upper roller 20 that rolls on the upper surface of the other waterproof sheet 7A (7B) to be crimped (the upper waterproof sheet 7A (7B) on the right side in Figures 9 and 7), one gripping portion 22 that is integrally connected to an upper shaft portion 21 that rotatably supports the upper roller 20, a lower roller 24 that rolls on the underside of the one waterproof sheet 7A (7B) to be crimped (the lower waterproof sheet 7A (7B) on the left side in Figures 9 and 7), and the other gripping portion 26 that is integrally connected to a lower shaft portion 25 that rotatably supports the lower roller 24, and the upper roller 20 and one gripping portion 22, and the lower roller 24 and the other gripping portion 26 are connected to each other so that they can move towards and away from each other and rotate freely around a fulcrum (the radial center of the connecting shaft 33 described below).

[0034] Specifically, the upper roller 20 is formed in a cylindrical shape. The upper shaft portion 21 is inserted into the upper roller 20. As a result, the upper roller 20 is rotatably supported by the upper shaft portion 21. The axial length of the upper roller 20 is set to be greater than the width of the double-sided tape 8. A connecting plate 30 extending along the radial direction of the upper roller 20 is integrally connected to one axial end of the upper shaft portion 21. One of the gripping portions 22 is integrally connected to the tip of the connecting plate 30. A through hole (not shown) is formed in the tip of the connecting plate 30. One of the gripping portions 22 is formed in a semicircular ring shape. The tip of the connecting plate 30 is connected to one longitudinal end of the linear portion 22A of one of the gripping portions 22.

[0035] On the other hand, the lower roller 24 is formed in a cylindrical shape. The lower shaft portion 25 is inserted into the lower roller 24. As a result, the lower roller 24 is rotatably supported by the lower shaft portion 25. The length of the lower roller 24 along the axial direction is set to be greater than the width of the double-sided tape 8. A connecting plate 31 extending along the radial direction of the lower roller 24 is integrally connected to the other axial end of the lower shaft portion 25. A connecting shaft 33 extending approximately parallel to the lower shaft portion 25 is integrally connected to the tip of the connecting plate 31.

[0036] The small-diameter shaft portion 33A at the tip of this connecting shaft 33 is inserted into a through-hole provided in the connecting plate 30 on the upper roller 20 side, and its tip is integrally connected to the other gripping portion 26. The other gripping portion 26 is formed in a semicircular ring shape. The tip of the small-diameter shaft portion 33A is connected to one longitudinal end of the linear portion 26A of the other gripping portion 26. The one gripping portion 22 on the upper roller 20 side and the other gripping portion 26 on the lower roller 24 side are respectively arranged at positions in the axial direction of the connecting shaft 33 so as not to restrict mutual rotational movement. The upper roller 20 and the one gripping portion 22, and the lower roller 24 and the other gripping portion 26 are rotatably supported with the radial center of the connecting shaft 33 as a fulcrum. Furthermore, when the linear portion 22A of one gripping portion 22 and the linear portion 26A of the other gripping portion 26 overlap in the axial direction of the connecting shaft 33, the outer circumferential surface of the upper roller 20 and the outer circumferential surface of the lower roller 24 come into contact with each other.

[0037] When using this crimping machine 17A to press and bond one (lower) waterproof sheet 7A (7B) to be crimped with the other (upper) waterproof sheet 7A (7B), the worker first inserts the fingers of one hand into the pair of gripping portions 22, 26 and moves the pair of gripping portions 22, 26 apart from each other so that the outer surfaces of the upper roller 20 and the lower roller 24 are separated from each other. Next, referring to Figures 13 and 14, the worker lifts the waterproof sheet 7A (7B) placed on the upper side, inserts the lower roller 24 into the underside of the waterproof sheet 7A (7B) placed on the lower side, inserts the connecting shaft 33 between the overlapping waterproof sheets 7A, 7A (7B, 7B), positions the upper roller 20 so that it is in contact with the upper surface of the upper waterproof sheet 7A (7B), and places the overlapping waterproof sheets 7A, 7A (7B, 7B) between the upper roller 20 and the lower roller 24, then holds the release sheet 11 with the other hand and holds the pair of holding portions 22, 26 with one hand so that they are close to each other, firmly clamping and pressing the overlapping waterproof sheets 7A, 7A (7B, 7B) between the outer surfaces of the upper roller 20 and the lower roller 24.

[0038] Next, the worker pulls the release sheet 11 with the other hand to peel it off from the adhesive layers 10, 10 of the double-sided tape 8, and while holding the pair of gripping portions 22, 26 close to each other with one hand, pulls toward the pair of gripping portions 22, 26, causing the upper roller 20 to roll on the top surface of the other (upper) waterproof sheet 7A (7B) to be crimped, and the lower roller 24 to roll on the bottom surface of one (lower) waterproof sheet 7A (7B) to be crimped. As a result, the crimping machine 17A according to this embodiment can crimp the widthwise ends of the overlapping waterproof sheets 7A, 7A (7B, 7B) to be crimped together.

[0039] In this embodiment, the worker uses the upper roller 20 and lower roller 24 of the crimping machine 17A of this embodiment to clamp the overlapping waterproof sheets 7A, 7A (7B, 7B) and firmly press them together while rolling the upper roller 20 and lower roller 24 along the crimping area.However, in the crimping machine 17A of this embodiment, a locking mechanism may be provided to restrict the upper roller 20 and lower roller 24 from rotating away from each other at a position where the upper roller 20 and lower roller 24 can firmly press the waterproof sheets 7A, 7A (7B, 7B) together with a predetermined pressure.

[0040] The locking mechanism may, for example, be a ratchet mechanism that allows rotation in one direction while restricting rotation in the other direction when the pair of gripping portions 22, 26 are rotated, or a stopper clip 35 or the like that prevents the pair of gripping portions 22, 26 (upper roller 20 and lower roller 24) from separating when they are positioned close to each other, as shown in Fig. 12. By employing this locking mechanism, desired qualities such as strength and watertightness of the crimped portion can be ensured. Furthermore, the worker simply rotates the upper roller 20 and the lower roller 24 to a position where they can firmly press the waterproof sheets 7A, 7A (7B, 7B) together with a predetermined pressure, and then pulls them along the crimped portion, improving workability.

[0041] Next, after the first pressure bonding step, referring to Fig. 8, the third-layer protective mats 6B, 6B of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation (performed in the above-mentioned sinking step), and the overlapping third-layer protective mats 6B, 6B are connected with a plurality of connecting strings 15 or the like, similar to the bottom-layer protective mats 6C, 6C. Subsequently, the second-layer waterproof sheets 7A, 7A of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation (performed in the above-mentioned sinking step).

[0042] Next, a second pressure-bonding step is carried out with reference to Fig. 9. In this second pressure-bonding step, when the second-layer waterproof sheets 7A, 7A of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation (performed in the above-mentioned sinking step), the widthwise end of the waterproof sheet 7A (second layer) of the other (upper) partial waterproof structure 4 (multilayer integrated waterproof sheet 3) overlaps the widthwise end of the waterproof sheet 7A (second layer) of one (lower) partial waterproof structure 4 (multilayer integrated waterproof sheet 3) so as to cover the double-sided tape 8, as in the first pressure-bonding step. Next, using the above-mentioned crimping machine 17, as described above, the release sheet 11 of the double-sided tape 8 attached to the waterproof sheet 7A of one of the partial waterproof structures 4 (multilayer integrated waterproof sheet 3) is peeled off, and the widthwise ends of the overlapping waterproof sheets 7A, 7A of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are pressed together and crimped together.

[0043] After the second pressure-bonding step, as after the first pressure-bonding step, a cavity (not shown) is formed between the pair of supports 9, 9 (adhesive layers 10, 10) of the double-sided tape 8 and between the widthwise ends of the overlapping waterproof sheets 7A, 7A (second layer), and this cavity is used for a pressure test. This pressure test makes it possible to conduct a quality test on the pressure-bonded area using the double-sided tape 8.

[0044] 10, the first protective mats 6A, 6A of each partial waterproof structure 4, 4 (each multilayer integrated waterproof sheet 3, 3) are removed from their simple fixation (performed in the above-mentioned sinking step), and the overlapping first protective mats 6A, 6A are connected with a plurality of connecting strings 15 or the like, in the same way as the third and fifth protective mats 6B, 6B and 6C, 6C. This makes it possible to connect the widthwise ends of adjacent partial waterproof structures 4, 4 (each multilayer integrated waterproof sheet 3, 3) with the partial waterproof structures 4, 4 having been sunk down to the side of the revetment and the seabed.

[0045] While the construction method described above has been described for a multilayer integrated waterproof sheet 3 that is composed of five layers, namely, three layers of protective mats 6A, 6B, and 6C and two layers of waterproof sheets 7A and 7B, as shown in Figure 2, it can also be implemented in a similar manner for a multilayer integrated waterproof sheet 3 that is composed of three layers, namely, one layer of waterproof sheet and two layers of protective mats located above and below the waterproof sheet. When the multilayer integrated waterproof sheet 3 is composed of three layers, it is sufficient to perform the above-mentioned adhering step, sinking step, step of connecting the third layer of protective mats 6C, 6C, first pressure-bonding step, and step of connecting the first layer of protective mats 6A, 6A. Furthermore, when the multilayer integrated waterproof sheet 3 is not used and a protective mat is laid separately, or when no protective mat is laid, and there is only one layer of waterproof sheet, it is sufficient to perform the above-mentioned adhering step, sinking step, and first pressure-bonding step.

[0046] As described above, the construction method for the waterproof structure of this embodiment includes an attachment step, at a land yard near the installation site or on a large rigged ship, of attaching double-sided tape 8 to the widthwise end surfaces of the waterproof sheets 7A, 7B (second and fourth layers) of the multilayer integrated waterproof sheet 3 of one partial waterproof structure 4; a sinking step, of sinking the multilayer integrated waterproof sheets 3, 3 of the adjacent partial waterproof structures 4, 4 into the sea within the managed offshore disposal site 5, i.e., until they contact the side of the seawall and the seabed; and a pressing step, of pressing the widthwise ends of the overlapping waterproof sheets 7A, 7A (7B, 7B) of the adjacent multilayer integrated waterproof sheets 3, 3 together while peeling off the release sheet 11 of the double-sided tape 8 attached to the waterproof sheet 7A (7B) of the multilayer integrated waterproof sheet 3 of one partial waterproof structure 4.

[0047] As a result, with the multilayer integrated waterproof sheets 3, 3 of adjacent partial waterproof structures 4, 4 sunk into the side of the revetment and the seabed, the widthwise ends of the waterproof sheets 7A, 7A (7B, 7B) of each multilayer integrated waterproof sheet 3, 3 can be pressure-bonded to each other with double-sided tape 8. As a result, it is not necessary to temporarily place each partial waterproof structure 4, 4 on the sea surface by floating mooring using each flotation device 90, 90 (see Figure 23), as was done in the past, and therefore even if high waves attack, it is possible to prevent damage such as each partial waterproof structure 4, 4 being washed up onto the revetment, which in turn improves the workability (including safety) of the construction and, as a result, shortens the construction period.

[0048] Furthermore, there is no need to temporarily place each partial waterproof structure 4, 4 on the sea surface by floating mooring using each floating device 90, 90 (see Figure 23), as was done in the past.Therefore, even though the bonding strength of each partial waterproof structure 4, 4 as a multi-layer integrated waterproof sheet 3, 3 is insufficient, there is no risk of the third layer protective mat 6B, the fourth layer waterproof sheet 7B and the fifth layer protective mat 6C of the multi-layer integrated waterproof sheet 3 falling off due to wind and waves when floating moored as in the past, and it is possible to properly lay the waterproof structure 1 in its original multi-layer structure.

[0049] In addition, the crimping machine 17A applied to the construction method of the waterproof structure according to this embodiment is equipped with an upper roller 20 that rolls on the upper surface of the waterproof sheet 7A (7B) of the other (upper) partial waterproof structure 4 (multilayer integrated waterproof sheet 3), and a lower roller 24 that rolls on the lower surface of the waterproof sheet 7A (7B) of the one (lower) partial waterproof structure 4 (multilayer integrated waterproof sheet 3), and the upper roller 20 and the lower roller 24 are configured to be able to move towards or away from each other. As a result, even if the side of the revetment or the seabed on which each partial waterproof structure 4, 4 (multilayer integrated waterproof sheet 3, 3) is laid is made up of backfill stone or crushed stone, this structure makes it possible to obtain a reaction force, making it possible to easily crimp the widthwise ends of the waterproof sheets 7A, 7A (7B, 7B) of each multilayer integrated waterproof sheet 3, 3 together, further improving workability.

[0050] Furthermore, the crimping machine 17A according to this embodiment is provided with one gripping portion 22 integrally connected to the upper shaft portion 21 that rotatably supports the upper roller 20, and the other gripping portion 26 integrally connected to the lower shaft portion 25 that rotatably supports the lower roller 24, and the upper roller 20 and one gripping portion 22, and the lower roller 24 and the other gripping portion 26 are connected so as to be rotatable about a fulcrum (the radial center of the connecting shaft 33) so as to be able to move towards or away from each other. This allows the worker to grasp the pair of gripping portions 22, 26 of the crimping machine 17A and bring them close to each other, thereby bringing the pair of upper and lower rollers 24 close to each other, and easily maintaining this state of the crimping machine 17A. As a result, the widthwise ends of the waterproof sheets 7A, 7A (7B, 7B) of each multilayer integrated waterproof sheet 3, 3 can be easily crimped together.

[0051] Furthermore, in the crimping machine 17A according to this embodiment, the pair of gripping portions 22, 26 are formed in a ring shape, more specifically a semicircular ring shape, or a ring-shaped gripping portion large enough for the operator's fingers to easily insert into, so that the operator can easily insert his or her fingers into the pair of gripping portions 22, 26 and operate them, resulting in excellent operability.

[0052] Referring to Figure 11, the double-sided tape 8 used in this embodiment is configured to include a pair of support bodies 9, 9 spaced apart in the width direction, adhesive layers 10, 10 provided on both sides of the support bodies 9, 9, and release sheets 11, 11 covering the pair of adhesive layers 10, 10 arranged along the width direction.However, if the above-mentioned pressure test is not taken into consideration, the double-sided tape 8 may simply include a support body 9, adhesive layers 10, 10 provided on both sides of the support body 9, and release sheets 11, 11 covering each of the adhesive layers 10, 10.

[0053] Next, a crimping machine 17B according to another embodiment, which is used in the first and second crimping steps described above, will be described with reference to Figures 15 to 21. When describing the crimping machine 17B according to another embodiment, only the differences from the crimping machine 17A shown in Figures 12 to 14 will be described. 15 and 21, a crimping machine 17B according to another embodiment comprises an upper roller 40 that rolls on the upper surface of the other waterproof sheet 7A (7B) to be crimped (the upper waterproof sheet 7A (7B) on the right side in Figures 9 and 7), one gripping portion 22 that is integrally connected to the upper roller 40, a lower roller 50 that rolls on the lower surface of one waterproof sheet 7A (7B) to be crimped (the lower waterproof sheet 7A (7B) on the left side in Figures 9 and 7), the other gripping portion 26 that is integrally connected to the lower roller 50, and a pair of peeling rollers 71, 72 that sandwich the release sheet 11 of the double-sided tape 8 and rotate in conjunction with the rotation of the lower roller 50 to peel the release sheet 11 from the adhesive layers 10, 10.

[0054] 15 and 16, the upper roller 40 is formed in a cylindrical shape. Shafts 41 and 42 protrude axially from both axial end surfaces of the upper roller 40. The shaft 41 extending from one axial end surface of the upper roller 40 is rotatably supported by a connecting plate 44. The tip of the connecting plate 44 is connected to one longitudinal end of the linear portion 22A of one of the gripping portions 22. A through hole (not shown) is formed in the tip of the connecting plate 44.

[0055] Meanwhile, the shaft portion 42 extending from the other axial end face of the upper roller 40 is rotatably supported by an L-shaped connecting angle 46. The connecting angle 46 is rotatably connected to the shaft portion 42 and is composed of a connecting plate portion 48 extending along the radial direction of the upper roller 40, and a connecting shaft portion 49 extending along the axial direction near the outer circumferential surface of the upper roller 40, perpendicular to the axial end of the connecting plate portion 48. The tip of the connecting shaft portion 49 of this connecting angle 46 is integrally connected to the connecting plate 44.

[0056] The lower roller 50 is formed in a cylindrical shape. The outer diameter of the lower roller 50 is the same as that of the upper roller 40. A shaft portion 51 protrudes axially from one axial end face of the lower roller 50. The shaft portion 51 is rotatably supported by an L-shaped connecting angle 55. The connecting angle 55 is rotatably connected to the shaft portion 51 and comprises a connecting plate portion 57 extending radially of the lower roller 50, and a connecting shaft portion 58 extending axially near the outer peripheral surface of the lower roller 50, perpendicular to the axial end of the connecting plate portion 57. Referring to FIG. 18 , a sprocket 66, for example, protrudes axially from the other axial end face of the lower roller 50. The sprocket 66 is disposed at the other longitudinal end of an accommodating recess 64 of a protective plate 62, which will be described later.

[0057] 15 and 18, the protective plate 62 is formed in a narrow plate shape with both longitudinal ends each having an outer shape formed in an arcuate surface. The protective plate 62 extends from the other axial end face of the lower roller 50 toward the front side of the pair of upper and lower rollers 40, 50 in the direction of travel of the crimping machine 17B. With reference to FIGS. 17 and 18, a housing recess 64 is formed on one side of the protective plate 62 facing the gripping portions 22, 26, with both longitudinal ends formed in an arcuate surface and extending with a predetermined width along the longitudinal direction of the protective plate 62. A support protrusion 67 is provided on one longitudinal end of the protective plate 62 (the side opposite the lower roller 50) so as to protrude outward in the longitudinal direction of the protective plate 62. With reference to FIGS. 15, 16, and 18, the first peeling roller 71 is formed in a cylindrical shape. A large number of conical protrusions 71A are provided at predetermined intervals on the outer peripheral surface of the first peeling roller 71 as slippage prevention means 73. The first peeling roller 71 is rotatably supported by a first support shaft 81 that is inserted inside the first peeling roller 71. The first support shaft 81 extends along the axial direction of the upper and lower rollers 40, 50. The other axial end of the first support shaft 81 is integrally connected to the support protrusions 67 of the protection plate 62.

[0058] 15, 16, and 18, the second peeling roller 72 is cylindrical. The outer diameter of the second peeling roller 72 is the same as the outer diameter of the first peeling roller 71. The outer diameters of the first and second peeling rollers 71, 72 are smaller than the outer diameters of the upper and lower rollers 40, 50. The outer peripheral surface of the second peeling roller 72 is provided with a number of receiving holes 72A (receiving portions) as slippage control means 73 that receive the multiple protrusions 71A provided on the first peeling roller 71. In other words, the slippage control means 73 is provided between the outer peripheral surface of the first peeling roller 71 and the outer peripheral surface of the second peeling roller 72. The second peeling roller 72 is disposed in a position where its outer circumferential surface abuts against the outer circumferential surface of the first peeling roller 71, i.e., where several projections 71A of the first peeling roller 71 are inserted into several receiving holes 72A of the second peeling roller 72. A sprocket 77 protrudes axially from the other axial end face of the second peeling roller 72. The second peeling roller 72 is rotatably supported by a second support shaft 82 inserted therein.

[0059] 17 and 18, the second support shaft 82 extends substantially parallel to the first support shaft 81. One axial end of the second support shaft 82 is inserted through a through-hole provided in the connecting plate 44 on the upper roller 40 side and is integrally connected to one longitudinal end of the linear portion 26A of the other gripping portion 26. Meanwhile, the other axial end of the second support shaft 82 is integrally fixed to one longitudinal end side (support protrusion portion 67 side) within the accommodating recess 64 of the protective plate 62. The sprocket 77 of the second peeling roller 72, which is rotatably supported by the second support shaft 82, is disposed within the accommodating recess 64 of the protective plate 62 at one longitudinal end side thereof.

[0060] 18 and 19, a chain 79, for example, is wound around the sprocket 66 of the lower roller 50 and the sprocket 77 of the second peeling roller 72 in the accommodating recess 64 of the protective plate 62. As a result, rotation from the lower roller 50 is transmitted to the second peeling roller 72 via the chain 79. Note that, referring to FIG. 17, the tip of the connecting shaft portion 58 of the connecting angle 55, which is rotatably supported on the shaft portion 51 of the lower roller 50, is integrally connected to the surface of the protective plate 62 facing the accommodating recess 64. In this way, the upper roller 40 and one gripping portion 22, and the lower roller 50 and the other gripping portion 26 are connected to each other rotatably about a fulcrum (the radial center of the second support shaft 82) so as to be able to move toward and away from each other. Furthermore, when the second peeling roller 72 rotates in conjunction with the rotation of the lower roller 50, the corresponding protrusions 71A of the first peeling roller 71 are sequentially inserted into the receiving holes 72A of the second peeling roller 72, causing the first peeling roller 71 to rotate in conjunction with the rotation of the second peeling roller 72.

[0061] When the crimping machine 17B presses the other (upper) waterproof sheet 7A (7B) to be pressed against one (lower) waterproof sheet 7A (7B) with the double-sided tape 8, it is necessary to make the speed of advancement by the upper and lower rollers 40, 50 the same as the speed at which the release sheet 11 from the double-sided tape 8 is peeled off by the first and second peeling rollers 71, 72. To this end, referring to Figures 18 and 19, for example, if the outer diameter (circumferential length) of the upper and lower rollers 40, 50 is twice the outer diameter (circumferential length) of the first and second peeling rollers 71, 72, it is necessary to make the outer diameter of the sprocket 66 of the lower roller 50 twice the outer diameter of the sprocket 77 of the second peeling roller 72 (gear ratio). In short, the outer diameter ratio of the upper and lower rollers 40, 50 to the first and second peeling rollers 71, 72 and the outer diameter ratio (gear ratio) of the sprocket 66 of the lower roller 50 to the sprocket 77 of the peeling roller 72 are matched.

[0062] When using this crimping machine 17B to press and bond the other (upper) waterproof sheet 7A (7B) to be crimped and one (lower) waterproof sheet 7A (7B) together (first and second crimping steps), the worker first inserts the fingers of one hand into the pair of gripping portions 22, 26 and moves the pair of gripping portions 22, 26 apart from each other so that the outer surfaces of the upper roller 40 and the lower roller 50 are separated from each other. Next, referring to Figure 21, the worker inserts the lower roller 50 into the underside of the waterproof sheet 7A (7B) placed below, while lifting the waterproof sheet 7A (7B) placed above, and places a pair of first and second peeling rollers 71, 72 between the overlapping waterproof sheets 7A, 7A (7B, 7B), peels off the release sheet 11 at the longitudinal end of the double-sided tape 8 from the adhesive layers 10, 10, and while slightly rotating the upper and lower rollers 40, 50, slightly rotates the pair of first and second peeling rollers 71, 72 relative to each other to sandwich them between them.

[0063] At approximately the same time, the upper roller 40 is positioned so as to contact the upper surface of the upper waterproof sheet 7A (7B), and the overlapping waterproof sheets 7A, 7A (7B, 7B) are positioned between the upper roller 40 and the lower roller 50. Then, the pair of gripping portions 22, 26 are grasped with one hand so that they are close to each other, and the outer peripheral surfaces of the upper roller 40 and the lower roller 50 firmly sandwich and press the overlapping waterproof sheets 7A, 7A (7B, 7B) together. Next, the worker holds the pair of gripping portions 22, 26 close to each other in one hand, or with the pair of gripping portions 22, 26 (upper and lower rollers 40, 50) locked using the above-mentioned locking mechanism, and pulls the pair of gripping portions 22, 26 toward each other, causing the upper roller 40 to roll (rotate clockwise in Figure 21) on the upper surface of the other (upper) waterproof sheet 7A (7B) to be crimped, and causes the lower roller 50 to roll (rotate counterclockwise in Figure 21) on the lower surface of one (lower) waterproof sheet 7A (7B) to be crimped.

[0064] At this time, as the upper and lower rollers 40, 50 rotate, the first and second peeling rollers 71, 72 also rotate, i.e., the first peeling roller 71 rotates clockwise in Figure 21 and the second peeling roller 72 rotates counterclockwise in Figure 21, so that before the overlapping waterproof sheets 7A, 7A (7B, 7B) are sandwiched and pressed together by the upper and lower rollers 40, 50, the release sheet 11 of the double-sided tape 8 is sequentially peeled off from the adhesive layers 10, 10, and then, in a continuous manner, the widthwise ends of the overlapping waterproof sheets 7A, 7A (7B, 7B) to be pressed together are pressed together by the adhesive layers 10, 10 of the double-sided tape 8 by the rolling pressure from the upper and lower rollers 40, 50.

[0065] 20 and 21, the release sheet 11 sandwiched between the first and second peel rollers 71, 72 emerges from between the first and second peel rollers 71, 72 with numerous puncture marks 88 formed by the protrusions 71A of the first peel roller 71 and the corresponding receiving holes 72A of the second peel roller 72. The release sheet 11 emerging from between the first and second peel rollers 71, 72 and bearing the puncture marks 88 extends sequentially in the direction of travel of the crimping machine 17B. In this manner, in the crimping machine 17B according to another embodiment, the rotation of the first and second peel rollers 71, 72 can peel the release sheet 11 of the double-sided tape 8 from the adhesive layers 10, 10, while crimping together the widthwise ends of the overlapping waterproof sheets 7A, 7A (7B, 7B) to be crimped.

[0066] The pressure-bonding machine 17B according to another embodiment described above is provided with a pair of first and second peeling rollers 71, 72 that rotate relative to each other as the upper and lower rollers 40, 50 rotate, thereby sandwiching the release sheet 11 of the double-sided tape 8 and peeling it off from the adhesive layers 10, 10, and the pair of first and second peeling rollers 71, 72 are positioned forward of the pair of upper and lower rollers 40, 50 in the direction of travel of the pressure-bonding machine 17B.

[0067] As a result, before the ends of overlapping waterproof sheets are pressure-bonded together underwater with the double-sided tape 8 by the upper and lower rollers 40, 50, the release sheet 11 of the double-sided tape 8 can be sandwiched between the pair of first and second peeling rollers 71, 72 and easily peeled off from the adhesive layers 10, 10 of the double-sided tape 8. As described above, the pressure-bonding machine 17B according to another embodiment is particularly equipped with the pair of first and second peeling rollers 71, 72, and therefore, compared to the pressure-bonding machine 17A shown in Figures 12 to 14, the operator does not need to peel off the release sheet 11 from the adhesive layers 10, 10 of the double-sided tape 8 in the first and second pressure-bonding steps, and this work can be performed efficiently and easily.

[0068] Furthermore, in a pressure bonding machine 17B according to another embodiment, a slippage prevention means 73 is provided between the outer peripheral surfaces of the pair of first and second peeling rollers 71, 72 to prevent slippage of the release sheet 11 when the pair of first and second peeling rollers 71, 72 rotate relative to one another. The slippage prevention means 73 is configured to include a number of protrusions 71A provided on the outer peripheral surface of the first peeling roller 71 and a number of receiving holes 72A provided on the outer peripheral surface of the second peeling roller 72 to receive each of the protrusions 71A of the first peeling roller 71. As a result, even when the first and second peeling rollers 71, 72 rotate relative to one another, the slippage prevention means 73 prevents the release sheet 11 from slipping between the first and second peeling rollers 71, 72, and the release sheet 11 can be easily captured between the first and second peeling rollers 71, 72, allowing the release sheet 11 to be reliably peeled from the adhesive layers 10, 10 of the double-sided tape 8 and guided in the predetermined direction.

[0069] In the above embodiment, a crimping machine 17A or 17B was used to crimp the widthwise ends of overlapping waterproof sheets 7A and 7B of each partial waterproof structure 4, 4 (multilayer integrated waterproof sheets 3, 3) together using double-sided tape 8, but this is not limited to this, and a crimping machine 17A or 17B may simply be used when crimping the ends of overlapping waterproof sheets together using double-sided tape 8 underwater. [Explanation of symbols]

[0070] 1 Water-impermeable structure, 3 Multi-layer integrated water-impermeable sheet, 5 Managed sea surface disposal site, 6A, 6B, 6C Protective mat, 7A, 7B Water-impermeable sheet, 8 Double-sided tape, 10 Adhesive layer, 11 Peel-off sheet, 17A, 17B Crimping machine, 20, 40 Upper roller, 21 Upper shaft portion, 22 One gripping portion, 24, 50 Lower roller, 25 Lower shaft portion, 26 Other gripping portion, 71 First peeling roller, 71A Protrusion portion, 72 Second peeling roller, 72A Receiving hole (receiving portion), 73 Slip prevention means

Claims

1. A construction method for laying a waterproof structure on at least the side of a revetment in a managed sea surface disposal site, the waterproof structure being formed by alternately stacking protective mats and waterproof sheets made of different materials and connecting the ends of the multi-layer integrated waterproof sheet to which the protective mats and waterproof sheets are welded, an attachment step of attaching double-sided tape to the surface or back surface of an end of one of the adjacent multilayer integrated waterproof sheets on land or on a ship; a sinking step of sinking the adjacent multilayer integrated waterproof sheets into the sea within the managed offshore disposal site; a pressure-bonding step in which the ends of the overlapping waterproof sheets of the adjacent multilayer integrated waterproof sheets are pressed together while peeling off the release sheet of the double-sided tape attached to the waterproof sheet of one of the multilayer integrated waterproof sheets; A construction method for a waterproof structure, comprising:

2. In the pressure-bonding step, a pressure-bonding machine is used to press the ends of the overlapping waterproof sheets of the adjacent multilayer integrated waterproof sheets together, The construction method for a waterproof structure described in claim 1, characterized in that the crimping machine comprises an upper roller that rolls on the upper surface of the waterproof sheet of the upper multi-layer integrated waterproof sheet, and a lower roller that rolls on the lower surface of the waterproof sheet of the lower multi-layer integrated waterproof sheet, and the upper roller and the lower roller are configured to be able to move towards and away from each other.

3. A crimping machine that crimps the ends of overlapping waterproof sheets together underwater using double-sided tape, an upper roller that rolls on the upper surface of the upper waterproof sheet; a lower roller that rolls on the lower surface of the lower waterproof sheet; Equipped with The crimping machine is characterized in that the upper roller and the lower roller are configured to be able to move toward and away from each other.

4. a pair of peeling rollers that rotate relative to each other in accordance with the rotation of the upper and lower rollers, thereby sandwiching the release sheet of the double-sided tape and peeling it off from the adhesive layer; 4. The crimping machine according to claim 3, wherein the pair of peeling rollers are arranged ahead of the pair of upper and lower rollers in the direction of travel of the crimping machine.

5. 5. The crimping machine according to claim 4, further comprising a slippage prevention means provided between the pair of peeling rollers for preventing the release sheet from slipping when the pair of peeling rollers rotate relative to each other.

6. The slippage prevention means is a plurality of protrusions provided on an outer peripheral surface of one of the pair of peeling rollers; 6. The crimping machine according to claim 5, further comprising: a number of receiving portions provided on the outer peripheral surface of the other peeling roller, each receiving one of the protrusions of the one peeling roller.

7. one gripping portion integrally connected to the upper roller side; and the other gripping portion is integrally connected to the lower roller side, The crimping machine according to claim 3, characterized in that the upper roller and the one gripping portion and the lower roller and the other gripping portion are connected so as to be rotatable about a fulcrum and capable of moving toward and away from each other.

8. The crimping machine according to claim 7 , wherein the gripping portion is formed in a ring shape.

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