JP5555268B2 - Repair method of water-impervious sheet stretched underwater and its repair tool - Google Patents

Description

  The present invention, for example, in a waste treatment plant set in an inner water area that is closed off from an outer water area by a revetment, a damaged part of a water shielding sheet stretched on a structure built on the bottom of the inner water area TECHNICAL FIELD The present invention relates to a repair method for a water shielding sheet stretched underwater and a repair tool for repairing the water.

  In recent years, waste disposal sites such as industrial waste may be set in an inner water area that is closed off from the outer water area by revetment. For example, as shown in FIG. 11, the entire configuration including this kind of waste treatment plant is a foundation work 2, a caisson 3 and an upper work 4 constituting the revetment 1, and an inner water area side rubble on the inner water area A side. Layer 5, embankment (belly soil layer) 6, sheet pile 7, water-impervious layer 8 and covering mortar 9, outer water area B side rubble layer 10 and block layer 11 are provided.

  In the foundation work 2, the bottom ground G is excavated and flattened, and then a crushed stone mound is constructed on the flat surface. The crushed stone mound has an isosceles trapezoidal shape when viewed from the side. The crushed stone mound plays a role in correcting the unevenness of the submarine ground G, load distribution of the superstructure, and preventing scouring due to waves and flows.

  The caisson 3 is installed on the foundation work 2. The caisson 3 plays a role in which the vertical load of the superstructure 4 and the horizontal load applied to the superstructure by waves and wind are transmitted to the bottom ground G.

  The superstructure 4 is installed on the caisson 3. And the superstructure 4 has the embankment (projection body) 4a, 4b which protruded upwards in the inner water area A side and the outer water area B side. The dikes 4a and 4b prevent contaminated water from the inner water area A from flowing out to the outer water area B, and prevent water from the outer water area B (sea or river water) from flowing out to the inner water area A. Yes.

  The inner water area side rubble layer 5 is formed with a predetermined interval from the foundation work 2. And, the inner water area side rubble layer 5 is fixed to the inner water area side surface of the belly soil layer 6 so that the slope 6b of the belly earth layer 6 does not collapse (the tip 6c of the belly soil layer 6). Protection). In addition, a sheet pile 7 penetrating the inner water area side rubble layer 5 is driven into the water bottom ground G.

  The embankment (belly soil layer) 6 is formed by introducing landfill soil (mountain soil, mountain sand, slag, etc.). In the landfill, an upper layer 6a is formed flat, and an inclined surface (slope) 6b is formed so as to be inclined downward so that the layer becomes thicker toward the lower layer (tip) 6c. The belly soil layer 6 is formed on the foundation work 2 so as to form the slope 6b at a predetermined height.

  The water-impervious layer 8 is constituted by a water-impervious sheet that is laid along the upper layer portion (flat surface) 6a and slope surface (inclined surface) 6b of the bellowed soil layer 6. And the water-impervious sheet 8 plays a role of preventing the contaminated water on the inner water area A side from flowing out to the outer water area B side.

  The covering mortar 9 is a flat barite made of mortar. The covering mortar 9 is stacked stepwise along the slope 6b of the bellows soil layer 6 so that the water shielding sheet 8 does not float from the slope 6b of the bellows soil layer 6 due to the water pressure in the outside water area A. Have a role to do.

  The outer water area side rubble layer 10 is formed so as to be adjacent to the lower layer (the tip) of the inclined surface (slope) of the foundation work 2. And the outside water area side rubble layer 10 is used as a legal stop (protection of the foundation of the foundation work 2) on the surface of the foundation water 2 on the outside water area B side so that the foundation work 2 and the block layer 11 described later are not collapsed. Created.

  The block layer 11 disperses and weakens the energy of waves in the outer water area B stacked on the outer block B and the foundation block 2 and the covering block 11a stacked on the covering block 11a. The wave-dissipating block 11b.

  Construction is as follows: foundation work 2, outer water area side rubble layer 10, covering block 11a, lower wave-dissipating block 11b, caisson 3, upper work 4, upper wave-dissipating block 11b, sheet pile 7, inner water side rubble stone It is performed in the order of the layer 5, embankment (belt soil layer) 6, the water shielding layer 8 and the covering mortar 9. However, it is not limited to this.

  In the waste disposal site, the damaged portion of the water shielding sheet 8 is regularly inspected, and when the water shielding sheet 8 is found to be damaged, the damaged portion is detected by a water shielding sheet repair tool and a handler is described later. (Not shown) and repaired (patch processing by thermal welding).

  As a repair tool for repairing a damaged portion of the water shielding sheet 8, for example, a repair tool including a cylindrical container and a backing plate is known (see Patent Document 1). The cylindrical container has a repair opening and a plurality of suction cups. The repair opening is formed at the bottom of the cylindrical container so that the damaged portion of the water shielding sheet can be repaired. The suction cup is arrange | positioned at the opening part so that the water shielding sheet of the peripheral part of a broken location can be adsorb | sucked. The backing plate is brought into close contact with the back side of the water-impervious sheet at the periphery of the damaged part.

  Such a repair tool has a peripheral edge of the damaged portion of the water shielding sheet so that the cylindrical container is lowered from above with respect to the water shielding sheet and the damaged portion of the water shielding sheet is surrounded by the repair opening of the cylindrical container. The part is adsorbed by a suction cup. After that, a backing plate is applied to the back surface of the water-impervious sheet at the peripheral part of the damaged part and brought into close contact therewith, and the repair opening of the cylindrical container is airtightly pressed against the peripheral part of the damaged part of the water-impervious sheet To do. In this state, the inside of the cylindrical container (repair opening) is drained, and the damaged portion of the water shielding sheet requiring repair is exposed to the air. Then, the damaged portion of the water shielding sheet exposed to the air is patched to repair the damaged portion.

JP 2002-126684 A

  However, in the repair method of the water shielding sheet stretched underwater in Patent Document 1, in order to bring the region surrounding the damaged portion of the water shielding sheet into an airborne state, from the damaged portion of the water shielding sheet It is an essential requirement that the repair opening of the tubular container is air-tightly pressed into an area surrounding the damaged portion of the water shielding sheet by the inserted backing plate. Therefore, in the underwater work, a process of inserting the backing plate from the damaged part of the water shielding sheet and a process of arranging the backing plate on the back side of the damaged part of the water shielding sheet are necessary. For this reason, there exists a problem that the operation | work is complicated and requires time.

  Accordingly, the present invention provides a method for repairing a water-impervious sheet stretched underwater and a repair tool for the same, in which the work surrounding the area around the damaged portion of the water-impervious sheet can be easily performed. This is the issue.

The method for repairing a water-impervious sheet stretched underwater according to the present invention is constructed so as to be stretched along the inner side surface of the revetment or to be spaced apart from the inner side surface of the revetment. Repair of the water-insulating sheet stretched underwater, repairing damage to the water-impervious sheet that occurs on the water-impervious sheet stretched along the inner or outer surface of the bank-like structure, in the inner water area inside the revetment Prior to repair work, the area surrounding the damaged portion of the water shielding sheet is pressed against the revetment or the bank-like structure, and the area surrounding the damaged portion is surrounded. The inside water is drained, the inside of the area surrounding the damaged part is in the air, and the damaged part of the water shielding sheet in the area surrounding the damaged part is welded and repaired. .

  According to such a configuration, the portion surrounding the damaged portion of the impermeable sheet surrounded the damaged portion of the impermeable sheet by keeping the portion pressed against the revetment or the bank-like structure. The area can be easily sealed and the area can be in the air. Therefore, it becomes possible to quickly repair the damaged portion of the water shielding sheet. In other words, the previously used suction plate for absorbing the water shielding sheet and the backing plate disposed on the back side of the damaged portion of the water shielding sheet become unnecessary, so that the work for repairing the water shielding sheet, especially the above-mentioned area, is absorbed. Since the work of sealing using a board or a backing plate is eliminated, the repair work related to the water shielding sheet can be performed easily and in a short time.

  Here, in the repair method of the impermeable sheet stretched underwater according to the present invention, the dam is surrounded by surrounding the damaged portion of the impermeable sheet stretched on the outer surface of the dam-like structure. It is possible to adopt a configuration in which the reaction force pressed toward the structure is received by the revetment.

  According to such a configuration, by using the revetment and the bank-like structure, the part surrounding the damaged part of the water shielding sheet can be easily held in a pressed state. Water is easily drained.

  Further, the inner surface of the revetment or the area around the damaged portion of the water shielding sheet stretched on the inner surface of the bank-like structure is surrounded and pressed against the bank or the bank-like structure. It is also possible to adopt a configuration in which the reaction force is received by a temporary structure that is disposed so as to face the water shielding sheet.

  The temporary structure here refers to receiving the reaction force that pressed down the part surrounding the damaged part of the impermeable sheet stretched on the inner side of the revetment or the inner side of the bank-like structure. It is necessary to have a weight that can be formed and a size that faces a predetermined region of the water-impervious sheet having a damaged portion. And the temporary structure provided with these two conditions is arranged so as to face the water-impervious sheet, so that the part surrounding the damaged part of the water-impervious sheet is pressed between the two structures. Is kept in the state.

  In addition, a configuration is adopted in which the reaction force pressed against the revetment is received by the bank-like structure, surrounding the damaged portion of the water shielding sheet stretched on the inner surface of the revetment. can do.

  According to such a configuration, by using the revetment and the bank-like structure, the part surrounding the damaged part of the water shielding sheet can be easily held in a pressed state. Water is easily drained.

  The water-impervious sheet repairing tool according to the present invention is constructed so as to be stretched along the inner surface of the revetment or to be spaced apart from the inner surface of the revetment. In order to repair damage to the water-insulating sheet caused by water pressure from the outside water area outside the revetment, in the water area inside the revetment, in the water-impervious sheet stretched along the inner or outer surface of the bank-like structure A water-impervious sheet repairing tool stretched in water, which has a bottomed cylindrical shape having an opening / closing opening for an operator to enter and exit, and an operator accommodating space communicating with the opening / closing opening And a working space that extends in a direction orthogonal to the main pipe and communicates with the worker accommodating space, and a damaged portion of the water shielding sheet that communicates with the working space. A working tube composed of a branch tube having a working opening surrounding it Characterized in that it comprises a.

  According to such a configuration, the branch pipe is immersed in water with the main opening / exit opening projecting from the water surface, and the work opening is brought into contact with the damaged portion of the water shielding sheet. Then, the periphery of the damaged portion of the water shielding sheet, the work space, and the worker accommodating space are filled with water. If the water in these spaces is drained to the outside, the area around the damaged portion of the impermeable sheet is in the air, and the damaged portion of the impermeable sheet can be thermally welded.

  Here, in the repair tool for the water shielding sheet stretched in water according to the present invention, the work opening surrounding the damaged portion of the water shielding sheet is formed in the revetment or the bank structure. It is also possible to adopt a configuration including a press holding means for holding the pressed state.

  According to such a configuration, the work opening of the branch pipe of the auxiliary tool that surrounds the damaged portion of the water-impervious sheet can be held in a state of being pressed toward the revetment or the bank-like structure by the pressing and holding means. As a result, the water in the enclosed area is easily drained.

The pressing and holding means abuts on either the first abutting member that abuts on the main pipe, or the temporary structure disposed so as to face the revetment, the bank-like structure, or the water shielding sheet. You may make it provide the press holding tool comprised by the 2nd contact member and the expansion-contraction adjustment part which expands / contracts the 1st contact member and the 2nd contact member.

  According to such a configuration, the first abutting member of the pressing holder is abutted against the main pipe, and the second abutting member is abutted against any of the revetment, the bank-like structure, and the temporary structure, If the first abutting member and the second abutting member are extended in a direction away from each other, the worker accommodating portion and the working space of the working tube are easily in the air.

  According to the present invention, the portion surrounding the damaged portion of the water-impervious sheet is held in a state of being pressed against the revetment or the bank-like structure, and the region within the region surrounding the damaged portion is kept. Water is easily drained, and the area surrounding the damaged portion is easily put in the air. That is, repair of the damaged portion of the water shielding sheet can be processed easily and in a short time.

  Further, according to the present invention, there is provided a work tube body composed of a bottomed cylindrical main pipe having a worker accommodation space and a branch pipe having a work space communicating with the worker accommodation space. When the opening of the branch pipe of the work tube is pressed against one of the structures, the worker accommodating space and the work space are easily in the air.

Schematic which shows the whole structure of the waste disposal site set to the inner water area of the revetment of 1st Embodiment which concerns on this embodiment. The enlarged view of the principal part of FIG. (A) is a front view which shows the pipe body for a work of a water-impervious sheet repair tool, (b) is a side view of Fig.3 (a), (c) is a rear view of Fig.3 (a). 3A is a plan view of FIG. 3A, and FIG. 3B is a side sectional view of FIG. It is a perspective view which shows the press holding tool which presses a working pipe body to a structure, Comprising: (a) is a figure which shows a pipe, (b) is a figure which shows an expansion-contraction adjustment tool. It is a figure which shows the repair method which repairs the damage location of a water-impervious sheet, (a) is a figure which shows the state where a water-impervious sheet repair tool was suspended and located in the upper part of a reservoir, (b) The figure which shows the state by which the impermeable sheet repair tool was suspended and it was made to immerse in the water of a reservoir. The figure which shows the state by which the opening part for work of the work pipe body was contact | abutted around the breakage location of the water-impervious sheet. (A) is a figure which shows the state by which the work pipe was pressed by the structure with the press holder, (b) is the state by which the water inside the work pipe is drained with the pump and the drain hose FIG. (A) is a figure which shows the state which put the ladder in the inside of a work pipe, (b) is an operator entering the inside of a work pipe, and repairs the damaged part of a water-proof sheet. The figure which shows a state. Schematic which shows the repair method of the impermeable sheet of 2nd Embodiment which concerns on this invention. Schematic which shows the whole structure of the general waste disposal treatment plant set up in the inner water area of a revetment.

DESCRIPTION OF EMBODIMENTS An embodiment of a water shielding sheet repairing method stretched in water and a repair tool according to the present invention will be described with reference to FIGS. In the present embodiment, as in the case of FIG. 11, a waste treatment plant set in an inner water area closed from an outer water area by revetment will be described as an example. Therefore, the same reference numerals as those in FIG. 11 denote the same or corresponding parts, and only different points will be described.
(First embodiment)

  First, the overall configuration including the waste disposal site and the configuration of the main part will be described with reference to FIGS. 1 and 2. The overall configuration is such that the upper side portion of the water-impervious sheet 8 is spaced apart from the inner side surface of the revetment 1 and that the lower side portion of the water-impervious sheet 8 is along the slope 6b of the embankment 6. It is laid. And the covering mortar 9 is constructed | assembled on the water-impervious sheet 8 laid from the slope 6b of the embankment 6 to the shoulder 6d. In particular, in the shoulder 6d, the covering mortar 9 is constructed in a wall shape so as to be separated from the inner surface 1a of the revetment 1 with a gap. The covering mortar 9 is constructed such that the uppermost covering mortar 9 has a height protruding slightly above the position of the water surface of the inner water area A. In addition, the uppermost layer of the covering mortar 9 is assembled in a right triangle shape in a side view so as to be spaced apart from the inner side surface 1a of the revetment 1 and to be positioned on the water in the inner water area A. An iron wall 12 is fixed. The iron wall 12 is fixed to the uppermost stage of the covering mortar 9, but is slightly lower than the embankment (projection) 4 b of the upper work 4. A bank-like structure 15 is constructed by the covering mortar 9 and the iron wall 12 of the shoulder 6d. The outer surface of the bank-like structure 15, that is, the facing surface of the covering mortar 9 constructed on the shoulder 6 d facing the inner surface 1 a of the revetment 1 and the facing surface 12 a of the iron wall 12 are substantially flush with each other. Has been. And the upper part of the water-impervious sheet 8 is stretched on the outer surface (upright surface) of the bank-like structure 15 configured substantially flush. For this reason, the upper part of the water-impervious sheet 8 is in a state of being spaced apart from the inner side surface 1 a of the revetment 1. In addition, a basin 16 for releasing the lifting pressure from the outer water area B is formed between the inner side surface 1a of the revetment 1 and the outer side surface of the covering mortar 9 of the glue shoulder 6d constructed in a wall shape. Yes.

  Next, the repair tool used when repairing the damaged portion of the water-impervious sheet 8, that is, the working tube 20 and the press holder 25 will be sequentially described with reference to FIGS. 3 to 5. In the repair tool according to the present embodiment, the water-impervious sheet 8 is subject to fatigue failure due to repeated lifting of the water-impervious sheet 8 from the embankment (bedded soil layer) 6 due to lifting pressure, and other external factors. This is for repairing the damaged portion when the waterproof sheet 8 is damaged by the above.

  As shown in FIGS. 3 and 4, the working tube 20 as a repair tool includes a main pipe 21, a branch pipe 22, and a receiving plate 23. The main pipe 21 includes an entrance / exit opening 21a and a worker accommodating space 21b. The entrance / exit opening 21a has a size allowing an operator to enter and exit through the ladder. The worker accommodating space 21b communicates with the entrance / exit opening 21a and has a volume that allows the worker to freely move in the circumferential direction in an upright state.

  The branch pipe 22 is formed to extend in a direction orthogonal to the main pipe 21. The branch pipe 22 has a work opening 22a and a work space 22b. The work opening 22 a has a size that surrounds the damaged portion of the water shielding sheet 8. The work space 22b communicates with the worker accommodation space 21b and the work opening 22a. The work space 22b has a volume that allows the operator's hands to be inserted and removed and that can be moved freely. The receiving plate 23 is disposed on the side opposite to the branch pipe 22.

  And the receiving plate 23 is comprised by the rectangular-shaped board so that the edge part of the some pipes 26 ... of the press holder 25 mentioned later can contact | abut. More specifically, the receiving plate 23 is provided with pins 23a,... Protruding at appropriate positions, and the end of the pipe 26 is fitted to each pin 23a so that the end of the pipe is in contact with the receiving plate 23. Is maintained. In the present embodiment, the eight pins 23a,... Are annularly arranged at equal intervals, so that a plurality of pipes 26,. More specifically, the ring is more specifically arranged in a ring so as to be concentric with the branch pipe 22. The force is applied evenly to the branch pipe 22 (or the force from the branch pipe 22 is equalized). To receive. However, it does not have to be completely equal, and may be arranged in a polygonal shape, for example.

  As shown in FIGS. 5A and 5B, the pressing holder 25 as a repair tool includes a pipe 26 and an expansion / contraction adjustment tool 27. The pipe 26 is longer and larger in diameter than a male screw 270 of the expansion / contraction adjustment tool 27 described later, and abuts on the receiving plate 23 of the working tube 20. The expansion / contraction adjustment tool 27 has a male screw 270 and a female screw 271. The male screw 270 is fixed to a base end portion with a contact plate 270 a that abuts against the revetment 1. The female screw 271 is screwed into the male screw 270 so as to be freely movable with respect to the axial direction of the male screw 270. The male screw 270 is shorter than the inner diameter of the pipe 26 and has a smaller diameter. The male screw 271 is inserted into the pipe 26. The female screw 271 has handles 271a and 271a protruding in the radially outward direction. The handles 271a and 271a abut against the end face of the opening 26a of the pipe 26. Further, the female screw 271 moves relative to the male screw 270 by rotating the handles 271a and 271a in the circumferential direction.

  Next, the usage mode will be described. First, as shown in FIG. 6 (a), the working tube 20 is suspended by a crane (not shown) or the like, and above the water area (reservoir pond) 16 between the revetment 1 and the covering mortar 9. Be positioned. Then, as shown in FIG. 6B, the branch pipe 22 is immersed in water in a state where the entrance / exit opening 21 a of the main pipe 21 of the working pipe body 20 protrudes from the water surface. At this time, water flows in from the work opening 22a so that the area around the damaged portion of the water shielding sheet 8, the work space 22b of the branch pipe 22, and the worker accommodating space 21b of the main pipe 21 are filled with water. Become. As shown in FIG. 7, the working opening 22 a of the branch pipe 22 is brought into contact with the damaged portion X of the water shielding sheet 8.

  Then, as shown in FIG. 8A, the end face of the opening 26 a at one end of the pipe 26 of the pressing holder 25 is attached to the receiving plate 23 of the working tube 20. Next, the male screw 270 of the extendable tool 27 is inserted into the opening 26 a at the other end of the pipe 26. At this time, the end surface of the opening 26a at the other end of the pipe 26 comes into contact with the handles 271a and 271a. Next, the handles 271 a and 271 a are rotated in a loosening direction, and the contact plate 270 a of the male screw 270 is brought into contact with the revetment 1. Then, the handle 271a, 271a is rotated in the tightening direction at a position where the work opening 22a of the branch pipe 22 of the work tube body 20 is pressed around the damaged portion of the water shielding sheet 8. The pressed state is maintained.

  In this state, as shown in FIG. 8 (b), a water suction pump P to which a drain hose h is connected is disposed inside the main pipe 21, and the main pipe 21 and the drain hose h are connected by the water suction pump P and the drain hose h. The water inside the branch pipe 22 is drained to the outside. Then, the inside of the main pipe 21 and the branch pipe 22 (around the damaged portion of the water shielding sheet 8, the working space 22b, the worker accommodating space 21b) is in an airborne state.

  Next, as shown in FIG. 9A, a ladder H is placed inside the main pipe 21 (worker accommodation space 21 b) of the working pipe body 20, and the main pipe 21 ( The worker Y enters the worker accommodation space 21b), and the worker Y repairs the damaged portion of the water shielding sheet 8 through the work space 22b of the branch pipe 22 by a welder (not shown). 9 (b)).

Thus, according to the first embodiment, by using the revetment 1 and the bank-like structure 15 constructed so as to be spaced apart from the inner surface 1a of the revetment 1, it is possible to The work opening 22 a of the branch pipe 22 of the pipe body 20 can be easily pressed around the damaged portion of the water shielding sheet 8. That is, between the two structures (between the revetment 1 and the bank-like structure 15), the portion surrounding the damaged portion of the water shielding sheet 8 can be easily sealed, and the water shielding sheet 8 in the water can be sealed. The area of the damaged part can be easily converted into the air area.
(Second Embodiment)

  Next, a second embodiment will be described with reference to FIG. 1 is different from FIG. 1 in that a water shielding sheet 8 is stretched from the slope 6b of the embankment 6 built inside the revetment 1 to the inner surface of the revetment 1, and a water shielding sheet 8 having a damaged portion. A temporary structure 30 having a quadrangular cross section is arranged on the shoulder 6d of the embankment 6 so that the upper surface slightly protrudes from the water surface so as to face a predetermined region. And it arrange | positions so that the reaction force pressed around the revetment 1 surrounding the breakage location of the impermeable sheet 8 stretched on the inner surface 1a of the revetment 1 may face the impermeable sheet 8 The difference is that the temporary structure 30 is received. Moreover, it differs also in the point where the recreational basin 16 is not formed inside the revetment 1. Note that the facing surface 30a of the temporary structure 30 facing the inner surface 1a of the revetment 1 is configured as an upright surface so that the contact plate 270a of the pressing holder 25 can easily come into contact therewith.

  Then, the work tube body 20 is immersed in the water area between the revetment 1 and the temporary structure 30 so that the entrance / exit opening 21a of the work tube body 20 is exposed from the water surface. Next, the end face of the opening 26 a at one end of the pipe 26 of the pressing holder 25 is brought into contact with the receiving plate 23 of the working tube 20. Next, the male screw 270 of the extendable tool 27 is inserted into the opening 26 a at the other end of the pipe 26. At this time, the end surface of the opening 26a at the other end of the pipe 26 comes into contact with the handles 271a and 271a. Next, the handle 271a, 271a is rotated in the loosening direction, and the contact plate 270a of the male screw 270 is brought into contact with the facing surface (upright surface) 30a of the temporary structure 30 facing the inner surface 1a of the revetment 1. . Then, the handle 271a, 271a is rotated in the tightening direction at a position where the work opening 22a of the branch pipe 22 of the work tube body 20 is pressed around the damaged portion of the water shielding sheet 8. The pressed state is maintained. In this state, when the water inside the main pipe 21 and the branch pipe 22 is drained to the outside, the inside of the main pipe 21 and the branch pipe 22 is in the air, so that the damaged portion of the water shielding sheet 8 can be repaired. become.

  As described above, according to the second embodiment, the use of the revetment 1 and the temporary structure 30 arranged so as to face a predetermined region of the water-impervious sheet 8 having a damaged portion is used for work. The work opening 22 a of the branch pipe 22 of the pipe body 20 can be easily pressed around the damaged portion of the water shielding sheet 8. That is, between the two structures (between the revetment 1 and the temporary structure 30), the portion surrounding the damaged portion of the impermeable sheet 8 can be easily sealed, and the impermeable sheet 8 in water is damaged. The area of the location can be easily converted to the area in the air.

  In addition, this invention is not limited to the said embodiment, A various change can be made.

  For example, in the case of the above-described embodiment, the expansion / contraction adjustment tool is configured by the male screw 270 and the female screw 271 screwed into the male screw 270. However, the outer cylinder, the inner cylinder inserted into the outer cylinder, and the outer cylinder The expansion / contraction adjustment tool comprised with the volt | bolt which fixes the length of the inner cylinder with respect to a predetermined position may be sufficient.

  Moreover, in the case of the said embodiment, although the outside water area was made into the sea, a river and a lake may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Revetment, 2 ... Foundation work, 1a ... Inner side surface, 6 ... Filling (belt soil layer), 6b ... Slope, 6d ... Grip shoulder, 8 ... Water shielding layer (water shielding sheet), 15,150 ... Levee structure, 16 ... Reservoir, 20 ... Work pipe, 21 ... Main pipe, 21a ... Entrance / exit opening, 21b ... Worker accommodating space, 22 ... Branch pipe, 22a ... Work opening, 25 ... Press holder, 30 ... Temporary structure, G ... Submarine ground, X ... Damaged part, Y ... Worker

Claims (7)

Water shielding which is stretched along the inner surface of the bank, or is stretched along the inner surface or the outer surface of the bank-like structure constructed so as to be spaced apart from the inner surface of the bank. A repair method for a waterproof sheet that is stretched underwater, repairing damage to the waterproof sheet that occurs in the sheet in the inner water area inside the revetment,
Prior to repair work,
In the state where the part surrounding the damaged part of the water shielding sheet is pressed against the revetment or the bank-like structure,
Drain the water in the area surrounding the damaged part, make the air in the area surrounding the damaged part ,
A repairing method for a water-impervious sheet stretched underwater, wherein the damaged part of the water-impervious sheet in a region surrounding the damaged part is welded and repaired.   Surrounding the damaged portion of the water-impervious sheet stretched on the outer surface of the bank-like structure and receiving the reaction force pressed against the bank-like structure at the bank. The repair method of the water shielding sheet stretched in water of Claim 1 characterized by these.   The reaction force that presses against the revetment or the bank-like structure surrounding the damaged portion of the water-proof sheet stretched on the inner side of the bank or the inner side of the bank-like structure The method for repairing a water-impervious sheet stretched in water according to claim 1, wherein the water-impervious sheet is received by a temporary structure disposed so as to face the water-impervious sheet.   Surrounding the damaged portion of the water shielding sheet stretched on the inner surface of the revetment, the reaction force pressed against the revetment is received by the bank-like structure. The repair method of the water shielding sheet stretched in water of Claim 1 to do. Water shielding which is stretched along the inner surface of the bank, or is stretched along the inner surface or the outer surface of the bank-like structure constructed so as to be spaced apart from the inner surface of the bank. A repair tool for a waterproof sheet stretched underwater, used to repair damage to the waterproof sheet in the inner water area inside the revetment,
An opening for entering and exiting an operator, a bottomed cylindrical main pipe having a worker accommodating space communicating with the opening for entering and exiting, and extending in a direction orthogonal to the main pipe, A work tube comprising a work space communicating with the worker accommodating space and a branch pipe having a work opening surrounding the damaged portion of the water shielding sheet and communicating with the work space. A repair tool for a water shielding sheet stretched underwater.   The press holding means for holding the state where the working opening surrounding the damaged portion of the water shielding sheet is pressed toward the revetment or the bank-like structure is provided. The tool for repairing a water shielding sheet as described above, which is stretched underwater. The pressing and holding means may be any one of a first abutting member that abuts the bottomed cylindrical body, and a temporary structure disposed so as to face the revetment, the bank-like structure, and the water shielding sheet. 7. The apparatus according to claim 6, further comprising a pressing holder configured by a second abutting member that comes into contact, and an expansion / contraction adjustment unit that expands and contracts the first abutting member and the second abutting member. Repair tool for water shielding sheet to be installed.

Images