Water cutoff sheet structure for structure and installation method thereof

Abstract

To provide water cutoff structure for structures capable of securely following displacement of a joint of concrete structures to securely prevent water and the like from passing through the joint.SOLUTION: A joint 3 provided between tide embankments 2, 2 adjacent to each other can cut off water with outside embankment water cutoff sheet structure 10A and inside embankment water cutoff sheet structure 10B folded in specific widths whose shapes are held in folded shaped with a surface fastener and a pressing sheet, covering the joint 3 from both sides of the outside embankment and the inside embankment. The outside embankment water cutoff sheet structure 10A and the inside embankment water cutoff sheet structure 10B are pressed and held with pressure plates 30, 31, 32 into which anchor bolts 4 are penetrated over a whole height of sheet side end edges near the joint 3 of the embankments 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a water stop sheet structure for a structure and a method for installing the same, and more particularly to a water stop sheet structure for a structure that prevents water leakage at a joint due to displacement occurring between structures provided with a joint between adjacent structures, and a method for installing the same.

Background Art

[0002] Conventionally, various joint sealing structures have been proposed for sealing joints between reinforced concrete structures that make up levee structures such as breakwaters, and between structures such as caissons that form the foundation of levee structures (Patent Documents 1 and 2). In the joint sealing structure disclosed in Patent Document 1, a plate-shaped joint material 4 made of a flexible material for joint materials is installed at the joint between the structures 2, 2. During an earthquake or the like, the joint material 4 is adapted to absorb the displacement occurring at the joint. The joint structure disclosed in Patent Document 2 is configured by filling or arranging materials such as silicone or vinyl chloride sheets, which are each made of a material that can be elastically deformed by a predetermined amount, at the joint to form a three-layer structure of a surface joint portion, a cut-off portion, and a backup portion at the joint. Thereby, during an earthquake or the like, each material at the joint portion deforms within the elastic range, and the displacement occurring at the joint is absorbed.

[0003] Since the joint material 4 disclosed in Patent Document 1 is a plate material having an arch shape in plan view, the arch portion can be deformed to cope even when a large displacement occurs at the joint. However, in order to support both ends of the joint material, a portion (for example, an L-shaped plate 6) having a fitting groove for preventing the joint material from escaping is provided on the opposing surface of the joint. Therefore, the installation work of the joint material is complicated, and there is a problem that it can be applied only to a relatively large structure having a joint with a sufficiently large width.

[0004] In the joint structure disclosed in Patent Document 2, since the joint material is filled or installed so as to fill the width of the joint, when a displacement exceeding the elastic range of the joint material occurs at the joint, such as filling work or member installation work inside the joint, breakage or peeling of the joint material may occur, and the joint function may not be achieved.

[0005] A joint structure capable of solving these problems is disclosed in Patent Document 3. The joint structure disclosed in Patent Document 3 is configured to cover the joint between structures such as caissons with a joint material made of a strip-shaped rubber plate or the like from the outer wall surface. Therefore, it becomes possible to facilitate the installation work of the joint material and to cope with large displacements occurring at the joint.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the joint structure disclosed in Patent Document 3 has a structure in which an inner joint material made of a rubber plate or the like attached between joints at the site is covered, a concrete pedestal is further installed, and an outer joint material is stacked on this concrete pedestal. For this reason, there is a problem that the structure is complicated and the installation work at the site becomes troublesome.

[0008] Therefore, an object of the present invention is to solve the problems of the above-described conventional technology, enable the construction at the site to proceed quickly, and surely follow large displacements of the joint to surely prevent water leakage at the joint. An object of the present invention is to provide a water stop sheet structure for a structure and an installation method thereof.

[0009] The water stop sheet structure of the structure of the present invention is characterized in that a joint provided between adjacent structures is covered with a water stop sheet having a shape folded into a predetermined width and a sheet side edge supported over the entire height in the vicinity of the joint of the structure.​

[0010] It is preferable that the water stop sheet is formed by laminating a water blocking sheet made of synthetic resin and a woven fabric made of synthetic fiber, and the entire laminated sheet is folded into the predetermined width.

[0011] It is preferable that the water stop sheet is shaped such that the shape folded in the predetermined width is maintained by surface adhesion of the hook-and-loop fasteners provided on the water stop sheet.

[0012] It is preferable that the water stop sheet is shaped such that the shape folded in the predetermined width is maintained by surface adhesion of the hook-and-loop fastener provided on the water stop sheet and the hook-and-loop fastener provided on a pressing sheet supported by overlapping with the water stop sheet.

[0013] It is preferable that the water stop sheet is covered with a structure-side protective sheet provided facing the structure and an outer surface-side protective sheet provided on the outer surface of the water stop sheet.

[0014] It is preferable that bolt through-holes are formed in the water stop sheet, and the water stop sheet is supported by anchor bolts installed over the entire height of the structure in the vicinity of the joint of the structure through the bolt through-holes.

[0015] It is preferable that bolt through-holes are respectively formed in the structure-side protective sheet and the outer surface-side protective sheet, and the structure-side protective sheet and the outer surface-side protective sheet are supported by anchor bolts installed over the entire height of the structure in the vicinity of the joint of the structure through the bolt through-holes.

[0016] It is preferable that the water stop sheet is pressed and supported against the structure by a pressing plate supported by the anchor bolts.

[0017] It is preferable that the structure-side protective sheet and the outer surface-side protective sheet are pressed and supported against the structure by a pressing plate supported by the anchor bolts.

[0018] The water stop sheet is preferably installed so as to cover the joint from both the outer water pressure side and the inner water pressure side of the structure.

[0019] The pressing sheet for maintaining the shape of the water stop sheet is preferably supported by anchor bolts on the outer water pressure side of the structure and welded and supported to the water shielding sheet on the inner water pressure side of the structure.

[0020] The thickness of the pressing plate for supporting the water stop sheet is preferably set such that the inner water pressure side of the structure is thicker than the outer water pressure side.

[0021] As a method for installing the water stop sheet of the structure, a water stop sheet folded in advance to a predetermined width is suspended in a state of being extended over the entire height at an installation position near the joint of the structure, and the lowermost part of the suspended water stop sheet is temporarily fixed to the lower end of the structure along the structure, and then the water stop sheet is fixedly held over the entire height of the structure.

Advantages of the Invention

[0022] According to the water stop sheet structure and its installation method of the structure of the present invention, it can be efficiently installed at the joint between concrete structures arranged side by side so as to form a breakwater, and the installed water stop sheet structure can surely follow the displacement generated at the joint due to the load acting on the breakwater during an earthquake or a tsunami, and can surely prevent the passage of seawater or the like from the joint.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0024] Hereinafter, the configuration of the waterstop sheet structure of the structure of the present invention and the working procedure for installing the waterstop sheet structure will be described with reference to the accompanying drawings.

[0025] FIG. 1 shows a completed state in which the waterstop sheet structure of the present invention is installed on the seawall 1 assumed in the present embodiment as a structure. FIG. 2 shows an enlarged view of the installation state of the waterstop sheet structure 10 shown in FIG. 1. FIG. 3 shows an enlarged plan shape of the internal configuration of the waterstop sheet structure 10. In FIGS. 1 to 3, in order to explain the configuration of a plurality of sheets of the waterstop sheet structure 10, a state in which the upper end surface is open is shown, but in an actual structure, the upper end surface is sealed with a water-blocking sheet to prevent intrusion of rainwater and the like.

[0026] As shown in FIG. 1, the seawall 1 is constructed such that a dam body main body 2 made of reinforced concrete with a predetermined unit length forms a wall shape with joints provided at predetermined intervals along the planned extension direction along a coastline (not shown). Further, in the present embodiment, each reinforced concrete structure constituting the dam body main body 2 is supported by, for example, a plurality of steel pipe piles P (FIG. 6) so as to ensure stability against a predetermined external force. The seawall 1, which is an example of the object to which the present invention is attached, is a structure in which the dam body main body 2 has a height of 10.5 m on the outside of the dam from the ground surface G, a height of 9.0 m on the inside of the dam, and a thickness of 3.5 m. In addition, the width (joint width, joint dimension) of the joint 3 between the dam body main bodies 2 installed adjacent to each other is set to 20 mm, but the joint width may be 100 mm or more depending on the scale of the dam body main body 2 or the like, and in such a case, the configuration of the present invention can also be applied.

[0027] As shown in Fig. 1, the water-stop sheet structure 10 of this embodiment is installed over the entire height of the embankment body 2 of the flood control embankment 1 so as to cover the entire height of the joint 3 between adjacent embankment bodies 2 from the outer surface side. In this specification, since the configurations of the water-stop sheet structure 10 on the outer side of the embankment and on the inner side of the embankment are slightly different, hereinafter, when distinguishing between the two, they will be referred to as the outer embankment water-stop sheet structure 10A and the inner embankment water-stop sheet structure 10B, and when not distinguishing, it will be referred to as the water-stop sheet structure 10.

[0028] The outer embankment water-stop sheet structure 10A and the inner embankment water-stop sheet structure 10B of this embodiment are mainly aimed at preventing the leakage (passage) of water between the joints 3. As shown in the enlarged view of Fig. 2, both side edges are fixed to the embankment body 2, and it is composed of a plurality of types of sheets including a protection sheet 12 for the purpose of protecting and blocking water of the joint 3, a water-stop sheet body 20 having a bellows-like folded shape folded in multiple stages in the width direction of the sheet, a pressing sheet 13 for maintaining the overall shape of the folded water-stop sheet body 20, and a protection sheet 16 that serves as a cover for covering the entire water-stop sheet body 20 maintained in shape by the pressing sheet 13. They are substantially common in that they are fixedly held by anchor bolts 4 installed in advance on the embankment body 2 via pressing plates 30, 31, 32. On the other hand, the height of the water-stop sheet structure 10 and the sheet support structure such as the pressing plates 30, 31, etc. are slightly different between the outer side and the inner side of the embankment due to the acting direction of the water pressure acting on the flood control embankment 1 and the difference in the ground height on the outer side and the inner side of the flood control embankment 1.

[0029] The configurations of the outer embankment water-stop sheet structure 10A and the inner embankment water-stop sheet structure 10B will be described below with reference to Figs. 2 to 4. Figs. 2 and 3 show the states in which the outer embankment water-stop sheet structure 10A and the inner embankment water-stop sheet structure 10B are respectively folded in a bellows shape with a predetermined width and covered with a protection sheet 16 and fixed to the embankment body 2. The water-stop sheet structure 10 is held by anchor bolts 4 buried at intervals of 100 mm along the height direction in the vicinity of the side edges of the embankment body 2 through bolt through-holes (not shown) formed over the entire height of the side edges of the water-stop sheet structure 10, and is fixed by nut tightening with nuts 5.

[0030] [Configuration of embankment outer waterproof sheet structure 10A] The laminated structure of each sheet of the embankment-exterior water-stopping sheet structure 10A will be described with reference to the horizontal cross-sectional view of Fig. 3(a). In Fig. 3(a) and (b), two of two rows of anchor bolts 4 embedded in the embankment body 2, which is installed with a 20 mm gap between them as joints 3, with the threaded parts protruding from the embankment surface, are depicted spaced 450 mm apart in plan view. (Embankment side protective sheet 12) The embankment-side protective sheet 12 is held between two rows of anchor bolts 4 so as to cover the joints 3 between the embankment body 2. The embankment-side protective sheet 12 in this embodiment is made of a waterproof sheet made of soft polyvinyl chloride resin with a sheet thickness of 1.0 mm, and is attached in close contact with the embankment body 2 to prevent water from penetrating into the joints 3 and not passing through, thereby providing waterproofing (water stoppage). This protective sheet 12 also plays a role in preventing the water stop sheet main body 20 from rubbing against the embankment surface and becoming damaged.

[0031] (Water-stop sheet body 20) A waterstop sheet body 20, which is folded in several accordion-like stages in the width direction, is attached to the outer surface of the embankment-side protective sheet 12 between two rows of anchor bolts 4, overlapping the embankment-side protective sheet 12. The waterstop sheet body 20 is initially unfolded to a size of approximately 3 m in width and 16.5 m in height, and is made up of three overlapping sheets, as shown in Fig. 4(a), consisting of two polyester fiber woven fabric reinforcing sheets 21 and one soft polyvinyl chloride resin waterproof sheet 22. The three overlapping sheets, the resin waterproof sheet 22 (on the embankment outer side) and the woven fabric reinforcing sheet 21 (on the embankment inner side), are integrated at both end edges by sewing or hook-and-loop fasteners, and bolt through-holes are formed in the stitched portions at a predetermined pitch (100 mm pitch in this embodiment) over the entire height of the sheet.

[0032] In addition, in order to maintain the multi-stage bellows-like folding shape of the water stop sheet body 20, strip-shaped surface fasteners 23, 24, and 25 are attached over the entire height of the sheet at several locations on the front and back surfaces of the water stop sheet body 20 (the surface of the water shielding sheet 22 and the back surface of the reinforcing sheet 21) (Fig. 3(a)). When folding the long and narrow rectangular sheet in a bellows shape as shown in Fig. 3(a), by locking and surface-bonding the locking surfaces of these surface fasteners 23 and 24 to each other, a water stop sheet body 20 with a bellows-like folding shape of a predetermined width can be obtained. In this embodiment, two layers of the woven fabric reinforcing sheet 21 are used, but it is also possible to stack one or three or more layers according to the acting load, or to change the woven fabric thickness for countermeasures.

[0033] (Pressing sheet 13) The pressing sheet 13 is a long and narrow auxiliary sheet that plays a role in maintaining the shape by covering the bellows-folded water stop sheet body 20 from the outside. Each of the pressing sheets 13 has one end held by the anchor bolts 4 of the embankment body 2 (inside the embankment) or welded to the water shielding sheet 22 (outside the embankment), and is attached over the entire height near the side edges of the water stop sheet body 20 where the surface fastener 14 is formed at the other end. As the mating side for locking (surface bonding) with the surface fastener 14 of these pressing sheets 13, as shown in Fig. 3(a), the surface fasteners 25 are arranged and attached at two locations at the outermost surface position in the bellows-folded state. By locking (surface bonding) the surface fasteners 23 to each other, the surface fasteners 24 to each other, and the two surface fasteners 25 and the surface fasteners 14 of the two pressing sheets 13 respectively, the water stop sheet body 20 is maintained in a bellows-like folded state of a predetermined width.

[0034] (Outer surface side protection sheet 16) The outer surface side protection sheet 16 plays a role in shielding light from the water stop sheet body 20 and preventing damage to the water stop sheet body 20 by flying objects or the like. The outer surface side protection sheet 16 is folded in a bellows shape and covers the entire water stop sheet body 20 maintained in shape by the pressing sheet 13, and both side edges are held between two rows of anchor bolts 4. The outer surface side protection sheet 16 of this embodiment is made of a soft vinyl chloride resin sheet with a sheet thickness of 1.0 mm.

[0035] (Fixing process of the side edges of the external embankment waterstop sheet structure 10A) In the external embankment waterstop sheet structure 10A of this embodiment, bolt through-holes formed at both side edges of each of the laminated embankment-side protection sheet 12, waterstop sheet main body 20, pressing sheet 13, and outer surface-side protection sheet 16 are inserted and held by anchor bolts 4. A pressing plate 30 (plate thickness t = 12 mm) is inserted through the anchor bolts 4 so as to press and hold these laminated sheets, and the nuts are tightened on the anchor bolts 4 with a predetermined torque. An edge rope 27 with the side edge of the waterstop sheet main body 20 held over the entire height is attached to the outside of the pressing plate 30. This edge rope 27 serves to enhance the fixing effect of the side edge of the waterstop sheet main body 20 fixed using the pressing plate 30. Further, the butting portion at the tips of the side edges of the embankment-side protection sheet 12 and the outer surface-side protection sheet 16 is heat-welded so as to wrap the edge rope 27, and a bag-shaped portion 28 is formed. Thereby, the external embankment waterstop sheet structure 10A is completely covered by the embankment-side protection sheet 12 and the outer surface-side protection sheet 16, and intrusion of rainwater or the like into the external embankment waterstop sheet structure 10A is prevented.

[0036] [Configuration of the internal embankment waterstop sheet structure 10B] Regarding the configuration of each sheet of the internal embankment waterstop sheet structure 10B, it will be described with reference to the plan sectional view of FIG. 3(b). Similar to the external embankment waterstop sheet structure 10A, each sheet of the internal embankment waterstop sheet structure 10B is held by two rows of anchor bolts 4 provided on the embankment main body 2. The configuration of each sheet is substantially the same as that of the external embankment waterstop sheet structure 10A, but its waterstop function and support structure are different from those of the external embankment waterstop sheet structure 10A in that it receives the acting load by the water passing through the joint 3 from the outside of the embankment. Hereinafter, the same reference numerals are given to the same or similar components in both configurations for a brief description, and the differences in configuration will be described in detail. (Embankment-side protection sheet 12) The embankment-side protection sheet 12 is held between two rows of anchor bolts 4 in close contact with the embankment body 2, similar to the embankment-outside waterstop sheet structure 10A, so as to cover the inside of the joint 3 between the embankment bodies 2. The embankment-side protection sheet 12 of this embodiment is also composed of a water-blocking sheet made of soft vinyl chloride resin with a sheet thickness of 1.0 mm, aiming to block water leaking from the joint 3 in contact with the embankment body 2 and to prevent damage to the waterstop sheet body 20.

[0037] (Waterstop sheet body 20) The waterstop sheet body 20 of the embankment-inside waterstop sheet structure 10B also has its side edges held by two rows of anchor bolts 4, similar to the embankment-outside waterstop sheet structure 10A. In order for the waterstop sheet body 20 on the inside of the embankment to maintain a bellows-shaped folded shape with a predetermined width, as shown in Fig. 3(b), strip-shaped surface fasteners 23, 24, 25 are attached over the entire height at several locations, and by using these surface fasteners 23, 24, 25, a bellows-shaped folded shape with a predetermined width is maintained.

[0038] (Thick plate pressing plate 32) In the embankment-inside waterstop sheet structure 10B, the waterstop sheet body 20 needs to sufficiently resist the acting load of the water pressure of the water passing through the joint 3. Therefore, as shown in Fig. 3(b), a thick plate pressing plate 32 with a plate thickness t = 32 mm and a width of 200 mm in plan view is used to securely support the side edges of the waterstop sheet body 20. Through holes that can be inserted into the anchor bolts 4 are also formed in this thick plate pressing plate 32, and the waterstop sheet body 20 inserted and held by each anchor bolt 4 through the through holes in the side edges is securely pressed and fixed to the embankment surface by the thick plate pressing plate 32 having a sufficiently large thickness and width.

[0039] (Pressing sheet 13) The pressing sheet 13 of the embankment-inside waterstop sheet structure 10B has the same configuration as the pressing sheet 13 of the embankment-outside waterstop sheet structure 10A.

[0040] (Outer surface-side protection sheet 16) Even in the inner-dike waterstop sheet structure 10B, the entire waterstop sheet body 20, which is folded in a bellows shape with a predetermined width and kept in shape by the pressing sheet 13, is held between two rows of anchor bolts 4 by the outer surface side protection sheet 16. The outer surface side protection sheet 16 of the present embodiment is also made of a soft vinyl chloride resin sheet with a sheet thickness of 1.0 mm, and is intended to shield the waterstop sheet body 20 and prevent damage to the waterstop sheet body 20 caused by flying objects or the like.

[0041] (Fixing process for the side edges of the inner-dike waterstop sheet structure 10B) In the inner-dike waterstop sheet structure 10B of the present embodiment as well, through-holes formed at both side edges of each of the dike body side protection sheet 12, the waterstop sheet body 20, the pressing sheet 13, and the outer surface side protection sheet 16 are inserted and held by the anchor bolts 4. To hold and press these laminated sheets, a thick plate pressing plate 32 (t = 32 mm) and a pressing plate 31 (t = 12 mm) sandwich the sheets and are inserted through the anchor bolts 4, and the nuts are tightened (fully tightened) on the anchor bolts 4 with a predetermined torque. On the outside of the thick plate pressing plate 32, an edge rope 27 holding the side edge of the waterstop sheet body 20 over the entire height is positioned, which plays a role in enhancing the fixing effect of the waterstop sheet body 20 pressed by the thick plate pressing plate 32. Also, the butting portion at the tips of the side edges of the dike body side protection sheet 12 and the side edges of the outer surface side protection sheet 16 is heat-welded to form a bag-shaped portion 28.

[0042] [Installation procedure of the waterstop sheet structure 10] Hereinafter, the installation procedure of the waterstop sheet structure 10 of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 shows the working procedure for sequentially installing a plurality of sheets of the waterstop sheet structure 10 on the dike body 2. FIG. 6 shows the working state of the installation work of the protection sheet 16 and the waterstop sheet body 20.

[0043] The anchor bolts 4 to which the water stop sheet structure 10 of the present invention is attached and held are buried over the entire height at a predetermined position on the side end of the embankment body 2 during the embankment construction stage of the flood embankment 1. In the outside embankment water stop sheet structure 10A and the inside embankment water stop sheet structure 10B, the installation work processes are slightly different due to the difference in their configurations, but most of the work contents are common. Hereinafter, the installation work of the outside embankment water stop sheet structure 10A will be described, and then the installation work of the inside embankment water stop sheet structure 10B will be briefly described except for the work processes with characteristics.

[0044] (Installation work of the outside embankment water stop sheet structure 10A) In the installation work of the outside embankment water stop sheet structure 10A, first, the embankment side protection sheet 12 is attached to the embankment body 2. This embankment side protection sheet 12 is composed of a water shielding sheet that has been cut to a predetermined size in a manufacturing factory in advance, and two rows of bolt through holes are formed at a predetermined interval (for example, 100 mm) in the sheet height direction at a predetermined position of the sheet. The embankment side protection sheet 12 is carried into the site in a folded state with a width of about 50 cm for the work efficiency when attaching to the embankment body 2. The folded protection sheet 16 is placed on the gondola work floor 51 of the aerial work vehicle 50 at the site and lifted up to the top of the embankment. At the top of the embankment, the bolt through holes of the protection sheet 16 are inserted through the anchor bolts 4, and then the insertion work is sequentially advanced downward. Thereby, the protection sheet 16 is attached from the upper part to the lower part of the embankment body 2 (the left side of FIG. 6).

[0045] Next, the waterstop sheet body 20, which is folded in a bellows shape with multiple stages to a predetermined width and carried into the site, and the pressing sheet 13 attached to the side edge of the waterstop sheet body 20 so as to align the bolt through-holes are lifted by a truck crane 52 to a height corresponding to the height of the embankment body 2 using the suspension point portions (not shown) provided at the upper ends of the respective sheet bodies (right side of FIG. 6). From this state, the bolt through-holes at the lowermost ends of the waterstop sheet body 20 and the pressing sheet 13 are aligned with the anchor bolts 4 of the embankment body 2, and the lowermost end of the sheet is temporarily tightened with nuts. After determining the lowermost ends of the respective sheets, the waterstop sheet body 20 and the pressing sheet 13 are temporarily fixed in a stacked state using the anchor bolts 4 at predetermined intervals (for example, 3 m pitch) toward the upper part of the sheet. At this time, as shown in FIG. 3(a), the waterstop sheet body 20 folded in a bellows shape in the width direction has the surface fasteners 25 located on the outer surface side covered by the surface fasteners 14 of the pressing sheet 13 and adhesively bonded to the surface, and its folded state is maintained. When lifting the waterstop sheet body 20, in order to maintain the bellows-shaped folded shape, it is preferable to sandwich the waterstop sheet body 20 with a temporary shape-retaining metal plate (not shown) or the like. Further, when temporarily fixing the waterstop sheet body 20 and the pressing sheet 13, in order to enable position adjustment during final tightening of the nuts in a subsequent process, it is preferable to provide slack in the waterstop sheet body 20 and the pressing sheet 13.

[0046] When the waterstop sheet body 20 whose shape is maintained by the pressing sheet 13 is held by each anchor bolt 4 from the upper end to the lower end, temporary nut tightening is performed at predetermined intervals (for example, 3 m pitch) along the vertical direction of the sheet.

[0047] As the final step of sheet installation, the outer surface side protection sheet 16 also serving the purpose of light shielding is attached so as to cover the water stop sheet main body 20 downward from the upper part of the dike body. In this embodiment, only one row of bolt through holes is formed in the outer surface side protection sheet 16 in advance. Nut tightening is first performed on one side in the longitudinal direction of the outer surface side protection sheet 16 where the bolt through holes are formed, using a pressing plate 30 (t = 12 mm). This tightening is preferably performed with torque control by an electric torque wrench. Next, bolt through holes are drilled in the sheet surface at the positions of the corresponding anchor bolts 4 on the other side of the outer surface side protection sheet 16 where no bolt through holes are formed. The bolt through holes are inserted through the anchor bolts 4 in the other row, and similarly, the outer surface side protection sheet 16 is installed by pressing from the outside with the pressing plate 30 (t = 12 mm) and performing nut tightening. Not limited to this installation procedure, the time for fixing the protection sheet 16 can be shortened by forming two rows of bolt through holes in the outer surface side protection sheet 16 in advance, with one of the holes in a long hole shape.

[0048] After the water stop sheet main body 20 is properly installed, covered by the outer surface side protection sheet 16 via the anchor bolts 4 on the dike body main body 2 side, the side edges of the dike body side protection sheet 12 and the outer surface side protection sheet 16 are aligned and trimmed so as to wrap the edge rope 27 attached along the side edge of the water stop sheet main body 20, and the end faces are heat welded with a manual hot air welding machine (not shown) to form a bag-shaped portion 28. This prevents rainwater, seawater, etc. from entering the interior surrounded by the dike body side protection sheet 12 and the outer surface side protection sheet 16.

[0049] (Installation work of the inner dike water stop sheet structure 10B) The inner-dike waterstop sheet structure 10B is substantially the same as the structure of the outer-dike waterstop sheet structure 10A on the coastal side as described above. However, for the purpose of stopping the water that has passed through the joint 3, it is configured to be able to sufficiently resist the acting water pressure and the like. The installation work of the dike body side protection sheet 12 is the same as in the case of the outer dike side. The protection sheet 16 in the state of being folded in a bellows shape is sequentially inserted downward from the anchor bolt 4 at the top of the dike body by using the gondola work floor 51 of the high-altitude work vehicle 50 so as to install the protection sheet 16 from the upper part to the lower part of the dike body main body 2 (the left side of FIG. 6).

[0050] Next, similar to the outer-dike waterstop sheet structure 10A, the waterstop sheet main body 20 carried into the site and folded in a bellows shape and the pressing sheet 13 attached so as to align the bolt through holes on the side end edges of the waterstop sheet main body 20 are hoisted in, and the waterstop sheet main body 20 and the pressing sheet 13 are temporarily fixed in a state of being overlapped sequentially from below.

[0051] (Temporary fixing of the waterstop sheet main body 20 by the thick plate pressing plate 32) In the inner-dike waterstop sheet structure 10B, in order to securely support the side end edges of the waterstop sheet main body 20, a thick plate pressing plate 32 that ensures close contact between the waterstop sheet main body 20 and the dike body surface is used. With the side end edges of the waterstop sheet main body 20 pressed by the thick plate pressing plate 32, the nut is tightened with sufficient torque against the anchor bolt 4. Thereby, the waterstop sheet main body 20 is securely pressed and held against the dike body main body 2.

[0052] Next, the pressing sheet 13 is attached to the anchor bolt 4 to which the thick plate pressing plate 32 is attached. The pressing sheet 13 maintains the folded shape of the waterstop sheet main body 20, and the entire length from the upper end to the lower end of the waterstop sheet main body 20 and the pressing sheet 13 is held by each anchor bolt 4, and nut temporary tightening is performed at a predetermined interval (for example, 3 m pitch) in the vertical direction of the sheet.

[0053] Furthermore, similar to the outer-dike water-stop sheet structure 10A, an outer-surface side protection sheet 16 also serving the purpose of light shielding is attached so as to cover the water-stop sheet main body 20 downward from the upper part of the dike main body 2. In the case of the inner-dike water-stop sheet structure 10B, a pressing plate 31 (t = 12 mm) is attached so as to press the above-described thick plate pressing plate 32 and the pressing sheet 13 from the outer surface, and the nuts are fully tightened.

[0054] Furthermore, as a final step, the tip butting portions of the protection sheets 12 and 16 are heat-welded so as to wrap the edge rope 27 attached along the side edge of the water-stop sheet main body 20, thereby forming a bag-shaped portion 28.

[0055] In the above, a seawall has been described as an example of the structure to which the water-stop sheet structure is to be installed. However, the structure to which the water-stop sheet structure is to be installed is not limited to a seawall, and it goes without saying that the water-stop sheet structure can be applied to various structures provided in waters, such as breakwaters and water-stop walls, and structures such as tunnel lining concrete and box culverts, at locations where a joint structure is provided at joints between adjacent laying sections. At that time, the dike-side protection sheet in the above description is positioned as a structure-side protection sheet. Further, when the water-stop sheet structure of the present invention is applied to the various structures described above, the outer-dike water-stop sheet structure described in the embodiment is positioned as a water-stop sheet structure provided on the outer water pressure side acting on the joint between structures, and the inner-dike water-stop sheet structure functions as a water-stop sheet structure provided on the inner water pressure side where the water passing through the joint between structures acts outward from the structure side.

[0056] Note that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in each claim. That is, embodiments obtained by combining technical means appropriately modified within the scope shown in the claims are also included in the technical scope of the present invention.

Explanation of Reference Numerals

[0057] 1 Seawall 2 Dike main body 3 Joint 4 Anchor bolt 10 Waterproof Sheet Structure 10A Waterproof Sheet Structure on the Outer Side of the Embankment 10B Waterproof Sheet Structure on the Inner Side of the Embankment 12 Embankment-Side Protection Sheet 13 Pressing Sheet 14, 15 Surface Fasteners 16 Outer-Surface-Side Protection Sheet 20 Waterproof Sheet Body 21 Synthetic Fiber Reinforcement Sheet 22 Water-Shielding Sheet 24, 25, 26 Surface Fasteners 30, 31 Pressing Plates 32 Thick Plate Pressing Plate

Claims

1. A waterstop sheet structure for a structure, characterized in that a joint provided between adjacent structures is covered with a waterstop sheet having a shape folded into a predetermined width and the sheet side edges are supported over the entire height in the vicinity of the joint of the structure.

2. The waterstop sheet structure for a structure according to claim 1, wherein the waterstop sheet is formed by laminating a water-blocking sheet made of synthetic resin and a woven fabric made of synthetic fiber, and the entire laminated sheet has a shape folded into the predetermined width.

3. The waterstop sheet structure for a structure according to claim 1, wherein the waterstop sheet is formed by surface adhesion of surface fasteners provided on the waterstop sheet to maintain the shape folded into the predetermined width.

4. The waterstop sheet structure for a structure according to claim 1, wherein the waterstop sheet is formed by surface adhesion of a surface fastener provided on the waterstop sheet and a surface fastener provided on a pressing sheet supported by overlapping the waterstop sheet to maintain the shape folded into the predetermined width.

5. The waterstop sheet structure for a structure according to any one of claims 1 to 4, wherein the waterstop sheet is covered with a structure-side protective sheet provided facing the structure and an outer-side protective sheet provided on the outer surface of the waterstop sheet.

6. The waterstop sheet structure for a structure according to claim 4, wherein bolt through-holes are formed in the waterstop sheet, and the waterstop sheet is supported by anchor bolts installed over the entire height of the structure in the vicinity of the joint of the structure through the bolt through-holes.

7. The waterstop sheet structure for a structure according to claim 5, wherein bolt through-holes are formed in the structure-side protective sheet and the outer-side protective sheet, respectively, and the structure-side protective sheet and the outer-side protective sheet are supported by anchor bolts installed over the entire height of the structure in the vicinity of the joint of the structure through the bolt through-holes.

8. The waterstop sheet structure for a structure according to claim 6, wherein the waterstop sheet is pressed and supported against the structure by a pressing plate supported by the anchor bolts.

9. The waterstop sheet structure for a structure according to claim 7, wherein the structure-side protective sheet and the outer-side protective sheet are pressed and supported against the structure by a pressing plate supported by the anchor bolts.

10. The waterstop sheet structure for a structure according to claim 1, wherein the waterstop sheet is installed to cover the joint from both the outer water pressure side and the inner water pressure side of the structure.

11. The pressing sheet for maintaining the shape of the water stop sheet is supported by anchor bolts on the outside water pressure side of the structure, and is welded and supported by the water blocking sheet on the inside water pressure side of the structure. The water stop sheet structure of the structure according to claim 10.

12. The thickness of the pressing plate for supporting the water stop sheet is such that the inside water pressure side of the structure is set thicker than the outside water pressure side. The water stop sheet structure of the structure according to claim 10.

13. A water stop sheet pre-folded to a predetermined width is suspended at an installation position near the joint of the structure in a state of being extended over the entire height, and the lowermost part of the suspended water stop sheet is temporarily fixed to the lower end of the structure along the structure, and then the water stop sheet is fixedly held over the entire height of the structure. A method for installing a water stop sheet of a structure, characterized by the above.

Images