JP2014025280A - Method for constructing waterproof working space and waterproof working caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a waterproof working space and a waterproof working caisson capable of securing high sealing performance at a butting portion of a water shutoff material when constructing the waterproof working caisson through the water shutoff material which contacts a periphery of a pile-like body erected in water and configures a ring shape with both circumferential edges thereof butted.SOLUTION: Arc-like water shutoff materials 3A and 3B are installed at positions corresponding to a through-hole 2a on caisson segment bodies 2A and 2B with a predetermined protrusion distance from the caisson segment bodies 2A and 2B in a circumferential direction. The caisson segment bodies 2A and 2B are assembled so that the water shutoff materials 3A and 3B abut on a peripheral surface of a pile-like body 13. A caisson body 2 is constructed by abutting respective circumferential edges of the water shutoff materials 3A and 3B so as to surround a periphery of the pile-like body 13. The water shutoff materials 3A and 3B are pressed against the peripheral surface of the pile-like body 13 by inflating rubber tubes 4A and 4B which are extended along the peripheral surface of the water shutoff materials 3A and 3B with overlaps in the circumferential direction at butting portions JS of the water shutoff material 3A and 3B.

Description

  The present invention relates to a method for constructing a water stop working space and a water stop work box. More specifically, the present invention abuts on the outer peripheral surface of a pile-like body standing in water and forms an annular shape by abutting circumferential end portions. The present invention relates to a method for constructing a water stop working space capable of ensuring high sealing performance at a butt portion of the water stop material when the water stop work box is installed through the water stop material and the water stop work box.

  Investigate the degree of corrosion deterioration and repair if the corrosion deterioration has progressed for the wall-like bodies such as sheet piles that make up seawalls, rivers, etc. It is necessary to perform reinforcement work. Conventionally, when performing such investigation and repair work, for example, in the case of a wall-like body at the waterside, a box with an opening on the front and top surfaces is used as an elastic material such as rubber provided at the front end of the front of the box. The water-stopping material is placed in a predetermined position by contacting the water-like wall-like body, and then the water inside the box is discharged to form a work space inside the box.

  At this time, it is important not to cause water leakage in the work space formed by pressure-bonding the water-stopping material to the wall-like body to eliminate the gap between the wall-like body and the box. Therefore, a tubular elastic body is adopted as a water-stopping material, and compressed air is supplied to the inside of the tubular elastic body, so that a box-shaped body can be formed without causing a gap even on a wall-shaped body having various surface shapes. Has been proposed (see Patent Document 1).

  However, when installing a box around the outer periphery of a pile-shaped body standing in water and constructing a work space inside this box, Usually, a seam is generated in the circumferential direction. That is, since the water stop material abuts the end portions in the circumferential direction to form an annular shape, there is a problem that it is difficult to ensure high sealing performance at the abutting portion.

Japanese Utility Model Publication 2-93330

  The purpose of the present invention is to contact the outer peripheral surface of a pile-like body standing upright in the water and to install a water stop work box via a water stop material that forms a ring by abutting the circumferential ends. An object of the present invention is to provide a method for constructing a water stop working space capable of ensuring high sealing performance at a butt portion of a water stop material and a water stop work box thereof.

In order to achieve the above object, the construction method of the still water working space according to the present invention is such that a pile-like body standing in water is passed through a through hole in a bottom surface of a bottomed box having an upper surface opened. It is a construction method of a still water working space that surrounds the outer periphery of a pile-shaped body, installs the box in a predetermined position, and then drains the water inside the box to the outside to build the work space inside the box. ,
The box is composed of a plurality of box divisions obtained by dividing the box in the circumferential direction, and arc-shaped stops made of impermeable soft closed cells at positions corresponding to the through holes of each box division. A water material is attached by projecting a predetermined length in the circumferential direction from the box body, and the box bodies are formed by assembling the box bodies and penetrating the through holes. Install the box at a predetermined position so as to surround the outer periphery of the pile-shaped body, with the water-stopping material abutting on the outer peripheral surface and with the circumferential ends of the water-stopping materials adjacent in the circumferential direction abutting each other In addition, the outer circumferential surface is extended along the water-stopping material, and the seam-adjacent end portions of the water-stopping materials adjacent to each other in the circumferential direction are seamlessly or overlapped in the circumferential direction. Expanded rubber tube, expanded rubber tube and the pile-shaped body By compressing the water stopping material between, and this water stopping material, characterized in that to press the outer peripheral surface of the pile-shaped body.

  The water stop working box of the present invention includes a bottomed box having a through hole on the bottom surface and an open top surface, and a water stop material provided at a position corresponding to the through hole. A work space is built inside the box by letting the standing pile-shaped body penetrate and draining the water inside the box installed at a predetermined position surrounding the outer periphery of the pile-shaped body. A water stop work box, wherein the box is composed of a plurality of box bodies divided in a circumferential direction, and the water stop material is an arc-shaped impermeable soft closed cell body. The water material is attached so as to protrude from the box body by a predetermined length in the circumferential direction, each box body is assembled to form the box, and the box is enclosed so as to surround the outer periphery of the pile-like body. When installed at a predetermined position, the water-stopping material comes into contact with the outer peripheral surface of the pile-shaped body that is allowed to penetrate the through-hole, and in the circumferential direction. The circumferential ends of the water-stopping materials that meet each other face each other, extend along the outer circumferential surface along the water-stopping material, and between the circumferential ends of the water-stopping materials adjacent in the circumferential direction. Provided with a rubber tube that is installed seamlessly or overlapping in the circumferential direction at the butting portion, and compressing the water stop material between the expanded rubber tube and the pile-like body, The configuration is such that the outer peripheral surface of the pile-shaped body is pressed.

  According to the present invention, the box is constituted by a plurality of box divisions obtained by dividing the box in the circumferential direction, and the impermeable soft closed cells are provided at positions corresponding to the through holes of each box division. The arc-shaped water-stopping material consisting of is attached to each box body by projecting a predetermined length in the circumferential direction so that each box body is assembled, and the box is surrounded by the outer circumference of the pile-shaped body When installing, it is difficult for the water-stopping material to be drawn in the circumferential direction by the frictional force when contacting the outer peripheral surface of the pile-shaped body. In addition, even if the water stop material is pulled in the circumferential direction, the circumferential length is set to be slightly longer, so if the circumferential end portions of the water stop material adjacent to each other in the circumferential direction are brought into contact with each other, It is possible to eliminate the gap in the case, and it is possible to ensure high sealing performance at the butt portion of the water stop material.

  Furthermore, the rubber tube that is installed in a circumferentially seamless manner or in an overlapping manner at the abutting portion between the circumferential ends of the water-stopping material is expanded, and between the expanded rubber tube and the pile-shaped body, Since the water-stopping material is compressed and this water-stopping material is pressed against the outer peripheral surface of the pile-shaped body, it is more and more advantageous to ensure high sealing performance at the butt portion of the water-stopping material. Therefore, the water stop work box can be installed on the pile-shaped body without causing water leakage.

It is a top view which illustrates the water stop work box of this invention installed surrounding the outer periphery of a pile-shaped body. It is explanatory drawing which illustrates the water stop work box before installing in the pile-shaped body of FIG. 1 by planar view. It is AA sectional drawing of FIG. It is BB sectional drawing which shows the bottom face periphery of the box of FIG. It is explanatory drawing which illustrates arrangement | positioning of a rubber tube by planar view. It is explanatory drawing which illustrates the modification of a rubber tube by planar view. It is explanatory drawing which expands the process which has installed the box body division body of FIG. 2 on the outer periphery of a pile-shaped body, and illustrates it by planar view. It is explanatory drawing which expands the state where the circumferential direction edge part of the water stop material of FIG. 7 is drawn in the circumferential direction, and illustrates it by planar view. It is explanatory drawing which expands the state which assembled | attached the box division body adjacent to the circumferential direction and formed the box, and illustrated in planar view. It is explanatory drawing which expands the process which has installed the box body provided with the water stop material with which the circumferential direction edge part was compressed in the circumferential direction with the holder in the outer periphery of a pile-shaped body by planar view. . It is explanatory drawing which illustrates in a planar view the box body divided | segmented into the center part and the box part and comprised so that attachment or detachment was possible. It is explanatory drawing which expands a part of box division body formed by mounting | wearing with the one center part to the box part of FIG. 11, and illustrates it by a cross-sectional view. It is explanatory drawing which illustrates the mechanism which adjusts the compression amount of a water stop material by planar view.

  Hereinafter, the construction method and the water stop work box of the water stop work space of the present invention will be described based on the embodiments.

  As illustrated in FIG. 1 to FIG. 4, the water stop work box 1 of the present invention includes a bottomed box 2 having a through hole 2 a on the bottom surface and an open top surface, and a position corresponding to the through hole 2 a. Water-stopping materials 3A and 3B provided on the outer periphery and rubber tubes 4A and 4B extending on the outer peripheral surface along the water-stopping materials 3A and 3B. The water stop work box 1 is installed at a predetermined position so as to surround the outer periphery of the pile-like body 13 so as to penetrate the pile-like body 13 standing in water through the through hole 2a.

  The box 2 is composed of a plurality of box division bodies 2A and 2B divided in the circumferential direction. The number of box division bodies 2A and 2B constituting one box 2 is not limited to two, and may be three or more. Since the specifications of each box body 2A, 2B are basically the same, one box body 2A will be described as an example.

  The box body 2A is formed of a steel plate or the like. A tube storage portion 5A for storing the rubber tubes 4A and 4B is provided at a position on the inner peripheral side of the arcuate box-shaped divided body 2A in plan view. The water stop material 3A is attached to the inner peripheral side of the tube housing portion 5A.

  The inner peripheral side of the rubber tube 4A (4B) stored in the tube storage portion 5A is closed by the water stop material 3A (3B). The outer peripheral side, upper side, and lower side of the stored rubber tube 4A (4B) are surrounded by a rigid body such as the wall surface of the tube storage portion 5A (5B) and the bottom surface of the box body 2A (2B). The outer peripheral side, the upper side, and the lower side of the stored rubber tube 4A (4B) may be completely closed, but may not be completely closed.

  In this embodiment, there is provided a cover body 6 that is attached to the box divided bodies 2A and 2B and is disposed at a position on the outer peripheral side of the rubber tubes 4A and 4B of the butted portions JS of the water blocking materials 3A and 3B. . When the rubber tubes 4A and 4B stored in the tube storage portions 5A and 5B expand, they come into contact with the cover body 6. A cushion material 6 a is attached to the inner surface of the illustrated cover body 6. This cover body 6 can be provided arbitrarily.

  A fluid supply device 7 is connected to the rubber tube 4 </ b> A through a fluid pipe 8. In this embodiment, fluid pipes 8 are connected to both ends in the circumferential direction of the rubber tube 4A, but an appropriate number of fluid pipes 8 can be connected to appropriate positions.

  Since the specifications of the water-stopping materials 3A and 3B are basically the same, one water-stopping material 3A will be described as an example. The arc-shaped water blocking material 3A in plan view is disposed on the inner peripheral side of the tube storage portion 5A and attached to the box body 2A. The water blocking material 3A is formed of a water-impermeable soft closed cell body. The thickness of the water blocking material 3A is, for example, about 10 mm to 200 mm. As the water stop material 3A, for example, a sponge body formed of a resin material, a rubber material, an elastomer, or a composite material thereof is used. Specifically, an EPDM sponge body may be used as the water stop material 3A.

  As for the hardness of the water stop material 3A, for example, the 25% compression load is about 10 kPa to 50 kPa. This value is a measured value when a sample having a thickness of 12.5 mm, a length of 50 mm, and a width of 50 mm is compressed by an autograph at a compression speed of 50 mm / min.

  The water blocking material 3A is attached so as to protrude from the box body 2A by a predetermined length S in the circumferential direction. The predetermined length S is, for example, about 5 mm to 30 mm, more preferably about 10 mm to 20 mm. In this embodiment, it is the specification which the circumferential direction both ends of 3 A of water-stopping materials protruded from the box division body 2A in the circumferential direction.

  One end in the circumferential direction of the water blocking material 3A protrudes from the box body 2A by a predetermined length S in the circumferential direction, and the other end in the circumferential direction is the same level as the end in the circumferential direction of the box body 2A. It is possible to make it a specification. However, in this case, the circumferential end of the water blocking material 3B that is adjacent and facing in the circumferential direction is projected from the box body 2B by a predetermined length S in the circumferential direction.

  The rubber tubes 4A and 4B are extended on the outer peripheral surfaces of the water-stopping materials 3A and 3B along the water-stopping materials 3A and 3B. Then, as illustrated in FIG. 5, the rubber tubes 4A and 4B are installed so as to overlap in the circumferential direction at the butting portion JS between the circumferential ends of the water blocking materials 3A and 3B adjacent in the circumferential direction. In this embodiment, two rubber tubes 4A and 4B having an arc shape are used, and one rubber tube 4A is arranged above the other rubber tube 4B so that the circumferential end portions thereof overlap each other in the circumferential direction. ing.

  As illustrated in FIG. 6, one rubber tube 4 can be used. In this case, both ends in the circumferential direction of the rubber tube 4 are arranged so as to be shifted in the vertical direction. With this arrangement, the circumferential ends of the rubber tubes 4 overlap in the circumferential direction at one of the butted portions JS of the circumferential ends of the water-stopping materials 3A and 3B, and the rubber tube 4 at the other butted portion JS. Are arranged seamlessly.

  As described above, in the present invention, the rubber tube 4 (4A, 4B) is seamless or overlapped in the circumferential direction at the butted portion JS between the circumferential ends of the water blocking materials 3A, 3B adjacent in the circumferential direction. Installed.

  Hereinafter, a method for constructing a water stop working space according to the present invention will be described.

  As illustrated in FIG. 1 to FIG. 4, a lower support 10 b such as an angle is fixed to a predetermined position of a pile-like body 13 standing in water that is an installation target of the work waterstop 1 by, for example, welding. Then, the box bodies 2A and 2B are placed on the upper surface of the lower support 10b. Next, the box body 2 is formed by assembling these box body divided bodies 2A and 2B so that the pile-like body 13 is passed through the through hole 2a. For example, the box division bodies 2A and 2B are assembled together using bolts and nuts. A general sealing material 3 a made of rubber or the like is interposed between the mating surfaces of the box division bodies 2 </ b> A and 2 </ b> B.

  When forming the box 2, the inner peripheral surfaces of the water-stopping materials 3A and 3B are brought into contact with the outer peripheral surface of the pile-like body 13 that is penetrated through the through-hole 2a, and the water-stop adjacent to the circumferential direction. The box 2 is installed at a predetermined position so as to surround the outer periphery of the pile-shaped body 13 with the circumferential ends of the materials 3A and 3B being in contact with each other. Thereby, the pile-shaped body 13 standing in water will be in the state penetrated in the through-hole 2a of the bottom face of the bottomed box 2 which opened the upper surface. The box 2 installed at a predetermined position is fixed so as not to move upward by buoyancy acting on the box 2 by interposing the upper support 10a between the upper surface of the box 2 and the upper work.

  The rubber tubes 4A and 4B are extended on the outer peripheral surfaces of the water-stopping materials 3A and 3B along the respective water-stopping materials 3A and 3B. The rubber tubes 4A and 4B are installed seamlessly or overlapped in the circumferential direction at the butted portion JS between the circumferential end portions of the water blocking materials 3A and 3B.

  Next, a fluid supply device 7 is connected to the rubber tubes 4 </ b> A and 4 </ b> B via a fluid pipe 8. By operating the fluid supply device 7, a fluid (for example, water, air, etc.) is supplied into the rubber tubes 4A and 4B to be expanded, and the expanded state is maintained. The water-stopping materials 3A and 3B are compressed between the expanded rubber tubes 4A and 4B and the pile-like body 13, and the water-stopping materials 3A and 3B are pressed against the outer peripheral surface of the pile-like body 13 along with this. .

  Since the water blocking materials 3A and 3B are impermeable soft closed cells, even if the surface of the pile-like body 13 has irregularities, it can be easily deformed along the irregularities. And since the water stop material 3A, 3B which deform | transformed along the unevenness | corrugation is pressed against the outer peripheral surface of the pile-shaped body 13 by the rubber tube 4A, 4B which expand | swells, it can be made to closely_contact | adhere. Therefore, the water stop work box 1 can be stably fixed to the pile body 13 without causing water leakage between the through hole 2a of the box body 2 and the pile body 13.

  Since water is contained inside the box 2 installed at a predetermined position of the pile-like body 13, this water is discharged to the outside of the box 2 using a pump or the like. Thereby, a dry work space is constructed inside the box 2.

  By the way, in this invention, the circumferential direction edge part of arc-shaped water-stopping material 3A (3B) is attached so that the predetermined length S may protrude from the box division body 2A (2B) in the circumferential direction. Therefore, as illustrated in FIG. 7, when the box bodies 2 </ b> A and 2 </ b> B are assembled to each other and the box 2 is installed so as to surround the outer periphery of the pile-like body 13, the periphery of the water stop material 3 </ b> A (3 </ b> B). The corner C of the direction end portion is difficult to be pulled in the circumferential direction by the frictional force generated when the corner C contacts the outer peripheral surface of the pile-like body 13.

  For example, when the circumferential end of the water blocking material 3A (3B) is not protruded in the circumferential direction from the box body 2A (2B), the corner of the circumferential end of the water blocking material 3A (3B) When C comes into contact with the outer peripheral surface of the pile-like body 13, there is no room for escape to the outside. Therefore, the corner portion C is easily drawn and compressed in the circumferential direction by the frictional force.

  When the corner portion C is drawn in the circumferential direction, a gap is likely to occur at the abutting portion JS between the circumferential end portions of the water-stopping materials 3A and 3B, which is disadvantageous for ensuring high sealing performance. On the other hand, in this invention, when the corner | angular part C contact | abuts to the outer peripheral surface of the pile-shaped body 13, there exists room for the circumferential direction edge part of the water stop material 3A (3B) to deform | transform outside. Therefore, it becomes difficult for a gap to occur in the abutting portion JS, and high sealing performance can be ensured.

  As illustrated in FIG. 8, assuming that the corner portion C is drawn in the circumferential direction, the circumferential length of the water blocking material 3A (3B) is set slightly longer (by a predetermined length S). As illustrated in FIG. 9, when the circumferential end portions of the water blocking materials 3 </ b> A and 3 </ b> B adjacent to each other in the circumferential direction are brought into contact with each other, the butted portions JS are in close contact with each other. And since the water stop material 3A (3B) compressed between the expanded rubber tube 4A (4B) and the pile-like body 13 is extended in the circumferential direction, the butt portion JS is sealed in a watertight manner and is high. Sealing performance can be ensured.

  Further, in the present invention, the rubber tube 4A (4B) is disposed without a seam or overlap in the circumferential direction at the butting portion JS. And by expanding this rubber tube 4A (4B), the water-stopping material 3A (3B) is compressed between the pile-like bodies 13 and pressed against the outer peripheral surface of the pile-like body 13, so that the water-stopping material 3A It is becoming more and more advantageous to ensure high sealing performance at the 3B butt portion JS. Therefore, the water stop work box 1 can be installed on the pile-like body 13 without causing water leakage at the abutting portion JS.

  When the cover body 6 described above is provided, the expanded rubber tube 4 </ b> A (4 </ b> B) can obtain a reaction force by the cover body 6. Therefore, the abutting portion JS of the water blocking materials 3A and 3B can be pressed more strongly, which contributes to an improvement in sealing performance.

  The holder 9 illustrated in FIG. 10 can also be provided. This holder 9 is held in a state in which at least one of the circumferential end portions of the water blocking material 3A (3B) projected from the box body 2A (2B) in the circumferential direction by a predetermined length is compressed in the circumferential direction in advance. To do. Of course, you may hold | maintain in the state where the circumferential direction both ends of the water stop material 3A (3B) were compressed to the circumferential direction previously.

  In this embodiment, the holder 9 is composed of a main body 9a having an L-shaped angle and a fixing member 9b for fixing the main body 9a to the box body 2A. And in the process of assembling the box body 2B to the box body 2A, the circumferential end of the water stop material 3B adjacent in the circumferential direction is adjacent to the circumferential end of the water stop material 3A held by the holder 9. After being placed, the holder 9 is removed from the box body 2A.

  Since the corner C of the circumferential end of the water stop material 3A is protected by the holder 9, the box division bodies 2A and 2B are assembled to each other, and the box 2 is installed so as to surround the outer periphery of the pile-like body 13. When doing so, the corner C is not pulled in the circumferential direction. And by removing the holder 9 from the box body 2A, the circumferential end portion compressed in the circumferential direction of the water stopping material 3A is restored, so that the circumferential end portion of the facing water stopping material 3B and Crimp without gaps. Therefore, it is advantageous to seal the gap with the butt JS.

  As shown in FIGS. 11 and 12, the box body 2A (2B) has a plurality of center portions 11A and 11B to which the water stop material 3 is attached, and a box portion that is a portion excluding the center portions 11A and 11B. It can also be made to be detachable from each other. And it is set as the structure provided with several center part 11A, 11B from which the magnitude | size of the inner peripheral radius of the water-stop material 3 attached with respect to the box part 12 of one size differs. In FIG. 11, the inner peripheral radius of the water stop material 3 attached to the right central portion 11 </ b> A is larger than that of the left central portion 11 </ b> B.

  In the case of this configuration, the size of the inner peripheral radius of the water-stopping material 3 to be attached is the size of the radius of the pile-like body 13 to be installed in the water-stopping work box 1 from among the plurality of central portions 11A and 11B. The center part closest to the center part is selected, and the selected center part is attached to the box part 12 by fixing means such as bolts and nuts to form a box body divided body.

  With this configuration, it is not necessary to prepare a box body 2A (2B) for each outer diameter of the pile-like body 13. That is, even if the outer diameters of the pile-like bodies 13 are different, there is an advantage that one size of the box portion 12 can be used as it is only by changing the central portions 11A and 11B.

  The compression amount of the water stop material 3A (3B) can also be adjusted using the mechanism illustrated in FIG. In this mechanism, a locking portion 16 is provided on the inner peripheral surface of the box body 2A (2B), and the wire 14 locked by the two locking portions 16 is wound around the pile-shaped body 13. A wire length adjusting means 15 such as a turnbuckle is provided in the middle of the wire 14.

  And since the length of the wire 14 changes by operating the wire length adjustment means 15, the relative position of the box-shaped division body 2A (2B) with respect to the pile-shaped body 13 changes in connection with this. Therefore, it is possible to adjust the compression amount of the water blocking material 3A (3B) by appropriately operating the wire length adjusting means 15.

DESCRIPTION OF SYMBOLS 1 Water stop work box 2 Box 2A, 2B Box division body 2a Through-hole 3, 3A, 3B Water stop material 3a Seal material 4, 4A, 4B Rubber tube 5, 5A, 5B Tube storage part 6 Cover body 6a Cushion material DESCRIPTION OF SYMBOLS 7 Fluid supply apparatus 8 Fluid piping 9 Holder 9a Main body part 9b Fixing member 10a Upper support work 10b Lower support work 11 Center part 12 Box part 13 Pile body 14 Wire 15 Wire length adjustment means 16 Locking member

Claims (8)

Install the box in a predetermined position surrounding the outer periphery of the pile-shaped body by penetrating the pile-shaped body standing in water through the bottom hole of the bottomed box with the top open. This is a method for constructing a water stop working space in which the water inside the box is discharged to the outside and a work space is built inside the box.
The box is composed of a plurality of box divisions obtained by dividing the box in the circumferential direction, and arc-shaped stops made of impermeable soft closed cells at positions corresponding to the through holes of each box division. A water material is attached by projecting a predetermined length in the circumferential direction from the box body, and the box bodies are formed by assembling the box bodies and penetrating the through holes. Install the box at a predetermined position so as to surround the outer periphery of the pile-shaped body, with the water-stopping material abutting on the outer peripheral surface and with the circumferential ends of the water-stopping materials adjacent in the circumferential direction abutting each other In addition, the outer circumferential surface is extended along the water-stopping material, and the seam-adjacent end portions of the water-stopping materials adjacent to each other in the circumferential direction are seamlessly or overlapped in the circumferential direction. Expanded rubber tube, expanded rubber tube and the pile-shaped body By compressing the water stopping material between, how to build a water shut-off working space for the water stopping material, characterized in that to press the outer peripheral surface of the pile-shaped body.   The construction method of the water stop working space of Claim 1 which attaches the cover body which the expanded rubber tube contact | abuts to the said division | segmentation body in the position which becomes the outer peripheral side of the said rubber tube of the said abutting part.   At least one of the circumferential ends projecting a predetermined length in the circumferential direction from the box body of each water-stopping material is held in a state compressed in the circumferential direction in advance by a holder, and is adjacent to the circumferential direction. After the matching box body is assembled and the circumferential end of the waterstop adjacent to the circumferential direction is opposed to the circumferential end of the waterstop held by the holder, the holder The construction of the water stop working space according to claim 1 or 2, wherein a portion compressed in the circumferential direction is removed and the circumferential end portions of the water stop material adjacent in the circumferential direction are brought into contact with each other. Method.   Each box segment is separated into a central part to which the waterstop material is attached and a box part excluding the central part so as to be detachable from each other. A plurality of central portions having different inner peripheral radius sizes of the water-stopping material to be attached are prepared, and the inner peripheral radius size of the water-stopping material to be attached is the above-mentioned pile shape. The construction method of the water stop working space in any one of Claims 1-3 which select the center part nearest to the magnitude | size of the radius of a body, attach to the said box part, and form the said box body split body. A bottomed box having a through hole on the bottom surface and having an open top surface, and a water stop material provided at a position corresponding to the through hole, and penetrating a pile-like body standing in water in the through hole Thus, a water stop work box in which the work space is constructed inside the box by discharging the water inside the box placed at a predetermined position surrounding the outer periphery of the pile-shaped body,
The box is composed of a plurality of box divisions divided in the circumferential direction, and the water stop material is an arc-shaped impermeable soft closed cell body, and the water stop material is formed from the box division body. When the box is installed at a predetermined position so as to surround the outer periphery of the pile-shaped body, the box is formed by assembling the respective box-shaped divided bodies, and is attached by protruding a predetermined length in the circumferential direction. The water-stopping material is in contact with the outer peripheral surface of the pile-shaped body that is allowed to penetrate through the through-hole, and the circumferential ends of the water-stopping materials adjacent in the circumferential direction are in contact with each other. And a rubber tube that is installed seamlessly or overlapping in the circumferential direction at the abutting portion between the circumferential ends of the water-stopping materials adjacent to each other in the circumferential direction. The water stop material is compressed between the rubber tube and the pile-shaped body. , Water shut-off operations a box, characterized in that the arrangement for pressing the water stopping material on the outer peripheral surface of the pile-shaped body.   The water stop work box according to claim 5, further comprising a cover body that is attached to the box body and is disposed at a position on the outer peripheral side of the rubber tube of the butting portion and in contact with the expanded rubber tube.   At least one of the circumferential end portions projected from the box body divided by a predetermined length in the circumferential direction is held in a state compressed in advance in the circumferential direction, and the circumferential end of the retained water stopping material The water stop work box according to claim 5 or 6, wherein a holder is provided on the part, the holder being removed from the box body after the circumferential ends of the water stop material adjacent to each other in the circumferential direction are opposed to each other.   Each box body is separated into a central part to which the waterstop material is attached and a box part excluding the central part so that they can be attached to and detached from each other. The water stop work box according to any one of claims 5 to 7, comprising a plurality of central portions having different inner peripheral radii of the water stop material to be attached.

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