JP6664681B1 - Temporary deadline structure, construction method, and waterproof cover used for the construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary cutoff structure capable of preventing water leakage by a simple operation and easily reusing a liner plate which is a main component. SOLUTION: The temporary shutoff structure body 7 is constructed around the pier 10, and the temporary shutoff structure body 7a is constructed so as to have a predetermined height around the pier 10, and the temporary shutoff structure body. And a waterproof cover 7b which is provided so as to cover the outer side surface 7c of 7a and prevents water from leaking into the temporary shutoff structure body 7a. Preferably, the waterproof cover 7b includes at least one waterproof sheet 78 arranged along the circumferential direction of the outer surface 7c of the temporary shut-off structure body 7a, and when the at least one waterproof sheet 78 is arranged on the outer surface 7c. And a joint 78a formed between the sheet end portions 78d of at least one waterproof sheet 78, and a waterproof fastener 79 that joins the joint 78a so as to prevent water leakage from the joint 78a. [Selection diagram] FIG.

Description

  The present invention relates to a temporary closing structure constructed when repairing and repairing underwater structures such as bridge piers provided in water such as rivers and seas, a method of constructing the structure, and a waterproof cover used for the method of construction. .

  2. Description of the Related Art Conventionally, underwater structures such as bridge piers provided in water such as rivers and seas are repaired by methods such as concrete wrapping or aramid fiber winding when damages or the like occur due to aging, typhoons, earthquakes, or the like. At that time, in order to secure a working space, it is necessary to provide a dry environment without water around the underwater structure. This dry environment is created by constructing a tubular temporary shut-off structure at predetermined intervals around the underwater structure and excluding water from inside. Generally, the construction of this temporary closing structure is such that a plurality of members, such as a liner plate, which can be interconnected vertically and circumferentially of the underwater structure, are formed around the underwater structure by a diver underwater work. And connected with bolts and nuts. (For example, see Patent Document 1).

  However, in the above-mentioned prior art, there is a point to be improved as described below.

  That is, in the construction of the temporary closing structure, when connecting members such as the liner plate, which are the main constituent members, in order to reduce water leakage from the connecting portion, a water stopping packing is interposed between them, and bolts and It was necessary to tighten it with a nut. In a situation where the connecting operation is performed underwater, the diver must perform the operation in an unstable posture, so that there is a problem that water is easily leaked due to damage when assembling the watertight packing. Further, since the bolts and nuts are strongly tightened, there is a problem that the liner plate is deformed and it is difficult to reuse the liner plate.

JP-A-11-21908

  The present invention has been conceived under the circumstances described above, and can prevent water leakage with a simple operation, and can easily reuse a liner plate as a main component, a temporary closing structure, An object of the present invention is to provide a construction method and a waterproof cover used in the construction method.

A temporary cut-off structure provided by the first aspect of the present invention is a temporary cut-off structure constructed around an underwater structure, and constructed to have a predetermined height around the underwater structure. a temporary shut-off structure body that is, the provided so as to cover the outer surface of the temporary shut-off structure body, the example Preparations and waterproof cover, the to prevent water leakage into the interior of the temporary shut-off structure body, the waterproof cover The at least one waterproof sheet disposed along a circumferential direction of the outer surface of the temporary closing structure body, and the at least one waterproof sheet when the at least one waterproof sheet is disposed on the outer surface. A seam formed between the sheet ends, and a water leakage prevention joining means for joining the seam so as to prevent water leakage from the seam, and wherein the water leakage prevention joining means is provided at the seam. It is a provided waterproof fastener, The waterproof fastener is configured to join the seam in a closed state and make the seam waterproof, open the seam to separate the seam, and the temporary closing structure main body is for attaching the at least one waterproof sheet. A waterproof sheet attaching portion, wherein the waterproof sheet attaching portion is provided at a lower portion of the temporary closing structure main body, and the waterproof cover is configured such that a lower portion of the at least one waterproof sheet is attached to the waterproof sheet attaching portion. Attached, the upper portion of the at least one waterproof sheet is pulled up, and the waterproof fastener is pulled up and closed to cover the outer side surface of the temporary closing structure body, and the temporary closing structure The body main body is provided above the waterproof sheet attaching portion, and the upper part of the at least one waterproof sheet is positioned above the waterproof fastener. In lowered is open state, as fold-folded to the winding body or bellows wound in a roll, are temporarily fixing part for temporarily fixing, that you containing said.

Preferably, the temporary closing structure includes a space between the outer side surface of the temporary closing structure main body and the waterproof cover, and the space is filled with a filler.

  Preferably, the filler is a palm fiber mat.

  Preferably, the waterproof cover includes a resin coating layer.

  Preferably, the resin coating layer includes a polyurea resin.

The method for constructing a temporary closing structure provided by the second aspect of the present invention is a method for constructing a temporary closing structure constructed around an underwater structure, wherein the temporary closing structure includes a temporary closing structure. A body body, and a waterproof cover for preventing water from leaking into the temporary closing structure body, and the temporary closing structure body is constructed around the underwater structure so as to have a predetermined height. a construction step of the outer surface of the temporary shut-off structure body have a, and Kutsugae設step of covering with the waterproof cover, the waterproof cover includes at least one tarpaulin, sheet end of said at least one tarpaulin And a water leakage prevention joining means for joining so as to prevent water leakage from a seam formed between the portions, wherein the covering step comprises: Front between the sheet edges of the tarpaulin An arranging step of arranging the at least one waterproof sheet along a circumferential direction of the temporary closing structure body so as to form the seam; and connecting the seam formed in the arranging step to the water leakage prevention joining means. Bonding, wherein the arranging step includes a waterproof sheet attaching step of attaching the at least one waterproof sheet to a waterproof sheet attaching portion provided on the temporary closing structure main body. The sheet attaching portion is provided at a lower portion of the temporary closing structure body, and in the waterproof sheet attaching step, a lower portion of the at least one waterproof sheet is attached to the waterproof sheet attaching portion, and the water leakage prevention joining means includes: A waterproof fastener provided at the joint, wherein the waterproof sheet attaching step is opened by lowering the waterproof fastener downward. In this state, the upper portion of the at least one waterproof sheet is temporarily attached to a temporary fixing portion provided above the waterproof sheet attaching portion as a rolled-up body or a bellows-shaped folded body. A temporary fixing step of fixing the waterproofing fastener in the joining step, by closing the waterproof fastener, pulling up the at least one waterproof sheet upward, and pulling the waterproof fastener upward. It is characterized that you performed by Te close.

  Preferably, the joining step is performed after the temporary closing structure main body has reached the predetermined height, and in the joining step, the lifting of the waterproof sheet includes removing the winding body or the folded portion. It is configured to be performed while solving.

Preferably, the temporary closing structure main body includes an assembly intermediate assembled around the underwater structure, and the building step is formed so as to surround the underwater structure, and then the assembly intermediate is formed. Setting a work platform used to assemble the work platform at a predetermined height, wherein the work platform is capable of changing between a contracted state and an enlarged state around the underwater structure. Based on this, it is possible to take a first state in which the assembly intermediate can be assembled and the assembly intermediate can be held, and a second state in which the assembly intermediate can be passed and lowered into water. And the assembling step includes: setting the work platform to the first state, and assembling the assembly intermediate. A step Te, the lifting from the work platform to once a predetermined height the assembly intermediates, the working platform and the second state, the reducing step of lowering the assembly intermediates in water, said that lowered in water By repeatedly performing the assembling step and the assembling step and the descending step of installing the assembling intermediate on the foundation of the underwater structure, the assembling intermediate until the temporary closing structure main body reaches the predetermined height. And a laminating step of laminating.

  Preferably, the assembling step includes a waterproof sheet attaching section installing step of providing the waterproof sheet attaching section when the assembling intermediate is a first stage corresponding to a lower portion of the temporary closing structure body, The waterproof sheet attaching step is configured to be performed on the work platform in the first state.

  The waterproof cover provided by the third aspect of the present invention is a waterproof cover used in the method of constructing a temporary closing structure provided by the second aspect of the present invention, wherein the temporary closing structure body is provided. It is characterized by covering the outer side surface.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent water leak by a simple operation | work, and provides the temporary closing structure which can easily reuse the liner plate which is a main component, the construction method, and the waterproof cover used for the construction method. Can be.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

It is a perspective view showing a float platform concerning a 1st embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 1. It is a perspective view which shows the state which the float platform shown in FIG. 1 expanded. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 5A is a perspective view showing an example of a float divided body constituting the float platform of FIG. FIG. 5B is an exploded front view and an exploded plan view showing details of a VB section in FIG. 5A. FIG. 6A is a perspective view showing a connecting portion of two adjacent float divided bodies included in the float platform of FIG. FIG. 6B is a cross-sectional view taken along the line VIB-VIB in FIG. FIG. 6C is a cross-sectional view showing a state in which the connecting portion of the two float divided bodies shown in FIG. 6B is open. FIG. 7 is a perspective view showing an example of a temporary closing structure constructed using the float platform shown in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7. FIG. 9 is a cross-sectional view along the line IX-IX in FIG. 7. FIG. 10A is a perspective view illustrating an example of a liner plate included in the temporary closing structure illustrated in FIG. 7. FIG. 10B is a sectional view taken along line XB-XB in FIG. FIG. 11A is an exploded cross-sectional view in plan view showing a connecting portion of the left and right liner plates included in the temporary closing structure shown in FIG. FIG. 11B is an exploded cross-sectional view showing a connecting portion between the upper and lower liner plates as viewed from the left. FIG. 11C is an exploded front view showing the connecting portion of the upper, lower, left and right liner plates as viewed from the inside of the temporary closing structure. FIG. 12A is a perspective view showing an example of a reinforcing member used to attach a waterproof sheet included in the temporary closing structure shown in FIG. FIG. 12B is a perspective view showing an example of a reinforcing member arranged in a predetermined number of layers of the liner plates vertically stacked included in the temporary closing structure shown in FIG. 7. FIG. 13A is an exploded cross-sectional view showing a connecting portion between the liner plate included in the temporary closing structure shown in FIG. 7 and the reinforcing member shown in FIG. FIG. 13B is a front view showing the attachment plate of the reinforcing member shown in FIG. FIG. 13C is a front view showing a connecting portion between the reinforcing members shown in FIG. FIG. 13D is an exploded cross-sectional view showing a connecting portion between the upper and lower liner plates included in the temporary closing structure shown in FIG. 7 and the reinforcing member shown in FIG. FIG. 8 is an exploded front view illustrating an example of a waterproof cover included in the temporary closing structure illustrated in FIG. 7. It is a figure for demonstrating an example of the operation | work which constructs the temporary closing structure shown in FIG. 7, and is a front view which shows the installation state of the "hanging scaffold" on the pier upper part, and the "float platform" on the pier. Similarly, it is a perspective view which shows the assembly state of the assembly intermediate (1st stage) used for construction of a temporary closing structure on a float platform. It is a perspective view similarly showing the state where the waterproof cover was attached to the assembly intermediate (the first stage). FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII of FIG. 17. Similarly, it is a perspective view showing the state where the assembly intermediate (first stage) was once suspended. Similarly, it is a perspective view showing a state where an assembly intermediate (first stage) is lowered. Similarly, it is a perspective view showing the state where the assembly intermediate (the first stage) was installed on the pier foundation. FIG. 22 is a sectional view taken along the line XXII-XXII in FIG. 21. Similarly, it is a perspective view which shows the assembly state of the assembly intermediate (2nd stage) on the float platform. Similarly, it is a perspective view showing a state where an assembly intermediate (third stage) is stacked on an assembly intermediate (second stage) connected and fixed to an assembly intermediate (first stage). Similarly, it is a perspective view showing a state in which the outer side surface of the temporary closing structure body is covered with a waterproof cover, and supporting rods (cut beams and vertical beams) are provided inside. Similarly, it is a perspective view showing a state in which water is drained from the temporary closing structure to secure a work space in a dry environment. It is a partially expanded sectional view showing a temporary closing structure concerning a 2nd embodiment of the present invention. It is a top view showing an example of a float platform concerning a 3rd embodiment of the present invention. FIG. 29 is a perspective view showing an example of a float divided body constituting the float platform shown in FIG. 28. FIG. 30 is a perspective view illustrating an example of a curved shape generation spacer included in the float split body illustrated in FIG. 29. FIG. 31A is a plan view illustrating one state of the curved shape generating spacer illustrated in FIG. 30. FIG. 31 (B) is a plan view showing another state of the curved shape generating spacer shown in FIG. 30. FIG. 32 is a plan view showing an example of a float platform using the curved shape generating spacer shown in FIG. 31 (B). It is a perspective view showing an example of the curved shape generation spacer concerning a 4th embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. In the following description, directions such as the vertical direction are based on the description in the drawings.

<First embodiment>
[Float platform]
In an embodiment of the present invention, a float platform is used. This float platform is used for the construction of temporary closing structures to be built when repairing and repairing underwater structures such as piers provided underwater such as rivers, etc. Specifically, on top of that, An assembly intermediate for a temporary closing structure described later is assembled. As shown in FIGS. 1 to 4, the float platform FP <b> 1 is designed to float on the water surface W, and is arranged, for example, to surround the pier 10 of the bridge 1. The pier 10 corresponds to an example of an underwater structure according to the present invention. The float platform FP1 allows the assembly intermediate 70 of the temporary closing structure 7 to be assembled and held on water in a reduced state (see FIGS. 1 and 2), and the assembly 70 of the temporary closing structure 7 to pass through. In addition, it is configured such that it can be changed to an enlarged state (see FIGS. 3 and 4) that can be lowered into water. That is, the contracted state corresponds to the first state according to the present invention, and the enlarged state corresponds to the second state according to the present invention. As shown in FIGS. 1 to 4, the float platform FP <b> 1 includes a work float 2, a passage float 3, and a positioning spacer 4. It is desirable for the construction of the temporary closing structure 7 that the upper surface of the float platform FP1 protrudes above the water surface W, but it may sink slightly (about 20 cm). The float platform FP1 is an example of the work platform according to the present invention.

  The work float 2 is a main component of the float platform FP1. Substantially, the work float 2 can be changed between the contracted state and the enlarged state while maintaining the integrity. As shown in FIG. 1 to FIG. 4, the work float 2 includes a float split body 5 and a slide mechanism 6. Surrounding.

  As shown in FIGS. 1 to 4, the work float 2 (therefore, the float platform FP1) includes a plurality of (four in the present embodiment) float divided bodies 5. As shown in FIGS. 1 to 4 and FIG. 5 (A), each float divided body 5 has a rectangular shape in plan view and a rectangular float unit 50 having a rectangular parallelepiped shape, and a curved shape having a curved shape in plan view. And a float unit 50A. The rectangular float unit 50 and the curved float unit 50A impart buoyancy to the work float 2. The rectangular float unit 50 has a standard shape as a float unit. The assembly intermediate 70 includes a curved shape at least in part according to the cross-sectional shape of the pier 10. The curved shape of the curved float unit 50A matches the curved shape of the assembly intermediate 70.

  As shown in FIGS. 5 (A) and 5 (B), the rectangular float unit 50 and the curved float unit 50A are baskets formed of L-shaped steel and flat steel, and have a two-layer structure. I have. The upper layer 51 of the two-layer structure is formed so as to be able to accommodate a slide mechanism 6 described later. The lower layer 52 contains styrofoam 53. The Styrofoam 53 is for giving buoyancy to the rectangular float unit 50 and the curved float unit 50A, and is wrapped in an ester canvas used for a truck sheet. In addition, the number of the float divided bodies 5 forming the float platform FP1 is not limited to four, but may be two, three, five, six, seven, eight, nine, or more. Here, the rectangle means a rectangle such as a rectangle or a square, but includes a substantially rectangle. For example, the corners may be rounded or chamfered. Some or all of the sides constituting the rectangle may be curved sides. The rectangle may be slightly deformed to have a trapezoidal or parallelogram shape.

  As shown in FIG. 5 (A), a wooden scaffold 54 is provided as a work board on the upper surfaces of the rectangular float unit 50 and the curved float unit 50A. The wooden scaffolding plate 54 makes the upper surface of the float divided body 5 flat, and facilitates the work on the float platform FP1. The work plate is not limited to wood, but may be made of metal, FRP, rubber, or resin, and is preferably grating. Examples of the metal include iron, stainless steel, and aluminum. Examples of the resin include vinyl chloride, polypropylene, and polyethylene.

  As shown in FIG. 5A, the float split body 5 includes a straight portion 55 and a curved portion 56. The linear portion 55 is manufactured by connecting rectangular float units 50 having a rectangular parallelepiped shape, and the length can be adjusted according to the number of connected rectangular float units 50. The curved portion 56 is manufactured by combining a curved float unit 50A having a curved shape in plan view according to the site dimensions. As shown in FIG. 5B, the rectangular float unit 50 has a bolt mounting hole 50b at an end 50a. The float split body 5 is manufactured by connecting the rectangular float units 50 to each other with bolts 50c and nuts 50d. The curved float unit 50A also has a bolt mounting hole 50b at the end 50a. The curved float units 50A, the rectangular float unit 50 and the curved float unit 50A are also connected in the same manner. The float divided body 5 is not limited to the one including both the straight portion 55 and the curved portion 56, and may be the straight portion 55 or the curved portion 56 alone, or may be an L-shaped or U-shaped. Good.

  As shown in FIGS. 6A to 6C, two adjacent float split bodies 5 are connected by a slide mechanism 6. As shown in FIG. 6A, the slide mechanism 6 is accommodated in the upper layer 51 of the two-layer structure of the rectangular float unit 50. As shown in FIGS. 6B and 6C, the slide mechanism 6 is for sliding the adjacent float divided bodies 5 relatively to each other, and includes a slide pipe 60 and a slide bar 61. Then, the slide bar 61 is inserted into the slide pipe 60 and integrated so as to be slidable with each other. Two slide mechanisms 6 are provided for the connecting portions 20 between the adjacent float divided bodies 5. At the time of assembling the float platform FP1, the slide pipe 60 is fixed to one of the float divided bodies 5 adjacent to each other with bolts 63 using a fixture 62, and the slide bar 61 is attached to the other float divided body 5 with a fixture 64. It is fixed by bolts 63. As a result, two adjacent float divided bodies 5 can slide with each other. The slide mechanism 6 slides the float divided body 5 along the same track each time. By this sliding movement, the adjacent float divided bodies 5 are separated from each other. Due to the separation, the work float 2 converts between the contracted state and the enlarged state while maintaining the integrity. In addition, the slide mechanism 6 is equivalent to an example of the expansion-contraction connection means in the present invention. Further, the slide mechanism 6 may be housed in the upper layer 51 of the curved float unit 50A.

  As shown in FIG. 6B, when the slide bar 61 is slid into the slide pipe 60 in the direction indicated by the arrow N1 and is inserted deeply, the two adjacent float split bodies 5 relatively move with the arrows. As a result of sliding in the directions indicated by N1 and the arrow N2, the connecting portion 20 is brought into a close state, and the connecting portion 20 is brought into a closed state. As shown in FIG. 6C, when the slide bar 61 slides in the direction indicated by the arrow N9 and is inserted into the slide pipe 60 shallowly, the two float divided bodies 5 relatively move to the arrows N9 and N9, respectively. As a result of the sliding movement in the direction indicated by the arrow N10, the connecting portion 20 is opened and the connecting portion 20 is opened. In this manner, two adjacent float divided bodies 5 can be brought into a state of being close to each other or separated from each other by relative sliding movement.

  As shown in FIGS. 6B and 6C, the slide mechanism 6 includes a stopper mechanism 65. The stopper mechanism 65 is for preventing two adjacent float divided bodies 5 from being separated from each other, and includes a contact plate 65 a provided at the tip of the slide bar 61 and a pipe end 65 b of the slide pipe 60. It is composed of In the connecting portion 20, when the adjacent float divided bodies 5 relatively slide in the directions indicated by arrows N9 and N10 so as to increase the distance therebetween, the contact plate 65a contacts the pipe end 65b. And the slide movement stops.

  As shown in FIG. 1 and FIG. 2, the work float 2 (therefore, the float platform FP1) is provided with connecting portions 20 at four places. Each of these connecting portions 20 is provided with a slide mechanism 6. First, each float divided body 5 is appropriately slid and moved in the directions indicated by arrows N1, N2 and arrows N5, N6 (arrows N1 and N6 are in the same direction, arrows N2 and N5 are in the same direction, arrow N1 and arrow N2 are opposed to each other, arrow N5 and arrow N6 are opposed to each other, and so on), and then, are appropriately slid in the directions indicated by arrows N3 and N4 and arrows N7 and N8 (arrows N3 and N8). N8 is in the same direction, arrow N4 and arrow N7 are in the same direction, arrow N3 and arrow N4 are in the opposite direction, arrow N7 and arrow N8 are in the opposite direction, and so on). The floats 5 to be separated are close to each other, and the work float 2 is closed and contracted (arrows N1, N2, N5, N6 and arrows N3, N4, N7, N8 intersect each other (including a right angle)), Hereinafter the same)As a result, the float platform FP1 can assemble the intermediate body 70 for assembling the temporary closing structure 7 on the float platform FP1 and can be held.

  On the other hand, as shown in FIGS. 3 and 4, in the connecting portion 20, each of the float divided bodies 5 is first slid relative to each other in the directions indicated by arrows N9 and N10 and arrows N13 and N14 as appropriate (the arrows N9 and The same direction as arrow N14, the same direction as arrow N10 and arrow N13, the opposite direction from arrow N9 and arrow N10, the opposite direction from arrow N13 and arrow N14, and so on), and then arrows N11, N12 and arrow N15. , N16 in the direction indicated by arrow N11 and arrow N16 in the same direction, arrow N12 and arrow N15 in the same direction, arrow N11 and arrow N12 in the opposite direction, and arrow N15 and arrow N16. When the distance between the connecting portions 20 is increased, the adjacent float divisions 5 are separated from each other, and the work float 2 is opened and expanded (arrow N9, 10, N13, N14 and arrow N11, N12, N15, N16 and the intersecting directions (including a right angle), hereinafter the same). Thereby, a gap 21 is formed between the positioning spacer 4 and the work float 2 (each float divided body 5). As a result, the work float 2 can pass through the assembly intermediate 70 and be lowered into the water. The slide movement of the float split body 5 and the positioning of the work float 2 are performed using, for example, a workbench (not shown, the same applies hereinafter).

  As shown in FIGS. 1 to 4, the passage float 3 is disposed outside the connecting portion 20 of the work float 2, and is connected to the float divided body 5 by a rope (not shown, the same applies hereinafter) or the like. It is used as a passage for the worker to move when the work float 2 is enlarged. The passage float 3 is also formed by connecting a plurality of float units 30 each having a rectangular shape in plan view. The float unit 30 is a basket-shaped object formed of an L-shaped steel and a flat steel, and contains therein a polystyrene foam 31 wrapped in an ester canvas. As shown in FIG. 4, when the work float 2 is expanded, the outside 2 a of the work float 2 is in contact with the inside 3 a of the passage float 3.

  The positioning spacer 4 is a rubber fender fixed to the wall surface of the pier 10 with an anchor bolt (not shown), and positions the work float 2 when assembling the intermediate body 70 of the temporary closing structure 7. , For suppressing the swing. As shown in FIG. 2, the inside 2a of the work float 2 is in contact with the outside 4a of the positioning spacer 4 in a state where the float platform FP1 is contracted.

[Temporary deadline structure]
FIGS. 7, 8 and 9 show an example of the temporary closing structure 7 constructed according to the present embodiment. The temporary closing structure 7 is installed on the pier foundation 11. The height of the temporary closing structure 7 is set such that its upper part protrudes from the water surface W. That is, the height of the temporary closing structure 7 is determined based on the depth of the river or the sea. A supporting rod (a cutting beam 71 and a vertical beam 72) is appropriately provided inside the temporary closing structure 7. The temporary closing structure 7 includes a temporary closing structure main body 7a and a waterproof cover 7b. The temporary closing structure main body 7a includes a liner plate 73 having a predetermined curvature or a linear shape, and reinforcing members 74 and 74A connecting the upper and lower liner plates 73. The reinforcing members 74 and 74A also have a predetermined curvature or a linear shape. As shown in FIG. 8 and FIG. 9, concrete 75 for stopping water is poured around the bottom in the temporary closing structure 7. The temporary closing structure 7 is not limited to the structure that surrounds the entire circumference of the pier 10, but may be a structure that partially surrounds the pier 10.

  As shown in FIGS. 7, 8, and 9, the waterproof cover 7b includes a plurality of waterproof sheets 78 arranged along the circumferential direction of the outer surface 7c of the temporary closing structure body 7a, and a plurality of waterproof sheets 78. Is provided between the left and right sheet ends 78d of the respective waterproof sheets 78 when they are arranged on the outer side surface 7c, and a waterproof joint that joins the joints 78a so as to prevent water leakage from the joints 78a. A fastener 79 is provided. The waterproof fastener 79 corresponds to an example of the water leakage prevention joining means in the present invention. The waterproof fastener 79 joins the joint 78a in a closed state and makes it waterproof, and opens the joint 78a in a separated state. The temporary closing structure main body 7a includes a reinforcing member 74 for attaching a waterproof sheet 78. The reinforcing member 74 corresponds to an example of the waterproof sheet mounting portion according to the present invention. The reinforcing member 74 is provided at a lower portion (first-stage assembly intermediate body 70) of the temporary closing structure main body 7a. The waterproof cover 7b is attached to the reinforcing member 74 with the lower portion 78b of the waterproof sheet 78, the upper portion 78e of the waterproof sheet 78 is pulled up, and the waterproof fastener 79 is pulled up and closed. It covers the outer side surface 7c of 7a.

  FIGS. 10A and 10B show an example of a liner plate 73 having a predetermined curvature used for constructing the temporary closing structure 7. The liner plate 73 is made of, for example, a steel plate. As shown in FIG. 10A, bolt mounting holes 73b for mounting bolts are provided in the upper, lower, left and right end flanges 73a of the liner plate 73. As shown in FIG. 10B, the cross section of the liner plate 73 is corrugated. In the construction of the temporary closing structure 7, not only the curved shape but also the linear shape liner plate 73 is used.

  As shown in FIGS. 11 (A) and 11 (C), the connection of each liner plate 73 in the circumferential direction is performed by connecting the left and right end flanges 73a without the rubber waterproof packing therebetween. 73c and nut 73d. In addition, as shown in FIGS. 11B and 11C, the upper and lower end flanges 73a of the liner plate 73 are connected to each other by connecting a rubber water-tight packing, as shown in FIGS. It is performed by stopping the bolt 73c and the nut 73d without intervening. In addition, as shown in FIG. 11C, the circumferential seams of the liner plates 73 do not necessarily have to be aligned in the up-down direction. In addition, between the respective liner plates 73, a rubber waterproof packing may be interposed, just in case.

  FIG. 12A shows a reinforcing member 74 having a predetermined curvature used for constructing the temporary closing structure 7. The reinforcing member 74 is made of H-shaped steel, and has a bolt mounting hole 74c for mounting a bolt on its web 74b. The flange 74d of the reinforcing member 74 is provided with a bolt mounting hole 74e for mounting an attachment plate 77 described later. The flange 74d is provided with a bolt mounting hole 74f for mounting a waterproof sheet 78 described later. In the construction of the temporary closing structure 7, a reinforcing member 74 having not only a curved shape but also a straight shape is used.

  FIG. 12B shows a reinforcing member 74 </ b> A having a predetermined curvature used for constructing the temporary closing structure 7. The reinforcing member 74A is different from the above-described reinforcing member 74 in that the reinforcing member 74A does not have a bolt mounting hole 74f for mounting a waterproof sheet 78 described later on the flange 74d. In the present embodiment, the reinforcing member 74A is used in a portion where the waterproof sheet 78 is not attached. Of course, the reinforcing member 74 can be used in these places.

  As shown in FIG. 13 (A), the reinforcing member 74 is formed of the first and second liner plates 73 from the bottom of three stacks of liner plates 73 stacked vertically (an assembly intermediate 70 described later). It is arranged between the end flanges 73a, and is fixed to the liner plate 73 and the bolts 73c and the nuts 73d without interposing a rubber waterproof packing. At the joint in the circumferential direction of the reinforcing member 74, the attachment plate 77 shown in FIG. The attachment plate 77 has a bolt mounting hole 77a for mounting the bolt 73c, and is addressed so that the bolt mounting hole 77a matches the bolt mounting hole 74e as shown in FIG. As shown in (D), the bolt 73c and the nut 73d are fixed to the reinforcing member 74 without interposing a rubber waterproof packing. Incidentally, a rubber waterproof packing may be interposed between the end faces 74 g of the webs of the reinforcing members 74 or between the web 74 b of the reinforcing members 74 and the end flange 73 a of the liner plate 73. On the other hand, the reinforcing member 74A is disposed between the upper and lower end flanges 73a of the liner plate 73 for every three laminations (assembly intermediates 70, 70A described later) of the liner plates 73 vertically stacked, The liner plate 73 and the bolts 73c and nuts 73d are fixed without interposing a rubber waterproof packing. The reinforcing member 74A can also be attached to the temporary closing structure main body 7a in the same manner as the reinforcing member 74.

  As shown in FIGS. 7, 8, and 9, in the construction of the temporary closing structure 7 of the present embodiment, the assembly intermediates 70 and 70A are formed by connecting the liner plate 73 to the annular body of the pier 10 in the circumferential direction. This is a three-layer structure. A reinforcing member 74A is disposed between the upper and lower assembly intermediates 70 and 70A. The assembly intermediate 70 forms the first stage of the temporary closing structure main body 7a. The assembly intermediate 70A forms the second and third stages of the temporary closing structure main body 7a. The height of the assembly intermediates 70, 70A (that is, the number of stacked annular bodies) is determined appropriately in consideration of the workability on the float platform FP1 and the like, as well as the smooth descent work described below. For example, if the height of the liner plate 73 (the height in the vertical direction in FIG. 10A) is 500 mm, three laminations (1.5 m) are set based on the ease of work of the operator.

  Note that the number of stacked liner plates 73 in the assembly intermediates 70 and 70A is not limited to three, but may be one, two, four, five, six, or more. Further, in the first-stage assembly intermediate body 70, a reinforcing member 74 is disposed between the first and second liner plates 73 from below. This is for attaching a waterproof cover 7b described later. Of course, the reinforcing member 74 can be used between the assembly intermediates 70, 70A instead of the reinforcing member 74A. In addition, the temporary closing structure 7 is formed by stacking the assembly intermediates 70 and 70A of an appropriate number of stages according to the water depth (three stages in the present embodiment). The temporary closing structure 7 may be constructed by a single-stage assembly intermediate 70, or may be constructed by two-stage, four-stage, five-stage, six-stage, or more assembly intermediates 70, 70A. .

  As described above, the waterproof cover 7b includes the waterproof sheet 78 and the waterproof fastener 79. The waterproof sheet 78 is for preventing water outside the temporary closing structure 7 from leaking into the inside. The waterproof sheet 78 is formed, for example, in a rectangular shape using, for example, a track sheet made of ester canvas. A resin coating layer is formed on the outer surface of the waterproof sheet 78 by resin coating for protection. For coating, for example, a paint containing a polyurethane resin, a polyurea resin, a polyolefin resin, or the like as a main component is used. As a paint containing a polyurea resin as a main component, for example, LINE-X (registered trademark) can be mentioned.

  As shown in FIG. 14, a bolt mounting hole 78c for mounting to the reinforcing member 74 of the assembly intermediate 70 is formed in the lower portion 78b of the waterproof sheet 78. In order to cover the outer side surface 7c of the temporary closing structure main body 7a, a plurality of waterproof sheets 78 are arranged side by side in the circumferential direction. By being arranged side by side in the circumferential direction, a joint 78a is formed between sheet ends 78d in the left-right direction of the adjacent waterproof sheets 78. The joint 78a is a state in which the sheet ends 78d of the waterproof sheet 78 are abutted with each other, a state in which the sheet ends 78d are overlapped, and a state in which the sheet ends 78d are close to each other and a gap is generated. including.

  The waterproof cover 7b may be formed of one waterproof sheet 78. In this case, the joint 78a is formed between the left and right sheet ends 78d in the one waterproof sheet 78. Also in this case, the seam 78a has a state in which the sheet ends 78d of the waterproof sheet 78 are abutted with each other, a state in which the sheet ends 78d are overlapped, and the sheet ends 78d are close to each other to form a gap. Includes those in a state where

  As shown in FIG. 14, the waterproof fastener 79 is disposed at a joint 78 a of the plurality of waterproof sheets 78, and prevents the water outside the temporary closing structure 7 from leaking into the inside, and the plurality of waterproof sheets 78. For joining. The number of attachment points of the waterproof fastener 79 is determined by the size of the temporary closing structure main body 7a. The waterproof fastener 79 includes a pair of elements 79b and 79c which are attached to the tape 79a and which mesh with each other, and a slider which is disposed between the pair of elements 79b and 79c and which moves up and down to engage and disengage the pair of elements 79b and 79c. 79d.

  The tape 79a is, for example, a polyester base cloth coated on both sides with vinyl chloride (PVC), chloroprene synthetic rubber (CR), or polyurethane (PU). The elements 79b and 79c are made of nickel silver. The slider 79d is made of aluminum bronze. The pair of elements 79b and 79c are attached to the left and right sheet ends 78d of the adjacent waterproof sheet 78 via a tape 79a. The elements 79b and 79c are composed of an outer element and an inner element provided inside the outer element. By operating the slider 79d, the inner elements are engaged and the waterproof fastener 79 is closed. The pair of elements 79b and 79c are not stopped and stopped, and the waterproof sheet 78 can be handled separately from each other. When the joint 78a is a state where the sheet ends 78d are overlapped with each other, the waterproof fastener 79 is attached to a predetermined portion of the overlapped portion.

  When the waterproof sheet 78 is attached to the temporary closing structure main body 7a, the waterproof sheet 78 is connected by a slider 79d at a lower portion 78b. In this state, since the upper portions 78e of the adjacent waterproof sheets 78 are not connected, the upper portions 78e can be rounded to be rolled or folded in a bellows shape to be compact. Of course, before attaching to the temporary closing structure main body 7a, the pair of elements 79b and 79c may be stopped beforehand, and a plurality of waterproof sheets 78 connected from the beginning may be manufactured. As described above, the waterproof cover 7b may be formed by winding one waterproof sheet 78 around the outer surface of the temporary closing structure main body 7a. In this case, the left and right sheet ends 78d of the waterproof sheet 78 are provided. A waterproof zipper 79 is attached to the connector, and is connected in an annular shape. Also in this case, when the seam 78a is in a state where the sheet ends 78d are overlapped with each other, the waterproof fastener 79 is attached to a predetermined portion of the overlapped portion. Specifically, for example, PROSeal (registered trademark) manufactured by YKK is used as the waterproof fastener 79.

[Construction method of temporary closing structure]
Next, a method of installing the temporary closing structure 7 on the bridge 1 using the float platform FP1 of the present embodiment will be described.
As shown in FIG. 15, in the construction of the temporary closing structure 7, a suspension scaffold SS is provided on the lower surface of the bridge girder 13 installed on the pier upper part 12 as necessary. The hanging scaffold SS secures a moving space for an operator (not shown, the same applies hereinafter) by fixing the periphery of the scaffold plate to the lower surface of the bridge girder 13 with a hanging rod.

  As shown in FIG. 16, two support structures 8 are installed on the suspension scaffold SS (not shown in FIG. 16), one each on the left and right sides of the upper surface of the pier upper part 12. The shoring 8 is divided into three in the length direction. Nipping pieces 80 are provided on the divided supports 8a and 8b at both ends. The supporting piece 8 is fixed to the pier upper part 12 by directing the holding piece 80 to the side surface of the pier upper part 12 and connecting the divided supports 8a, 8b, 8c.

  Suspension fittings 81 are provided at both ends of the support 8, and wires 82 are provided to the suspension fittings 81. An electric chain block (electric hoist) 83 is provided on the wire 82, and a pair of hanging hooks 84 are provided on a hanging string (wire) of the electric chain block 83. However, the number of the suspension hooks 84 is arbitrarily selected so that the temporary closing structure 7 or its assembly intermediates 70, 70A can be suspended stably and safely. In the case where the suspension scaffold SS is not constructed, for example, the support 8 and the like may be lifted by a crane, and the worker may be moved up and down to the work position by the crane.

  Next, as shown in FIG. 16, the worker installs the work float platform FP <b> 1, and subsequently assembles an intermediate body 70 (first stage) of the temporary closing structure 7. The work float platform FP <b> 1 is installed on the water around the pier 10 using the float split body 5, the slide mechanism 6, the passage float 3, and the positioning spacer 4. These members and necessary equipment are transported to a construction position by an equipment barge (not shown). The float platform FP1 may be appropriately set to an annular shape, an elliptical annular shape, an oval annular shape, or the like in accordance with the annular shape of the temporary closing structure 7. In this embodiment, since the cross section of the pier 10 is an oval ring, the temporary closing structure 7 is also an oval ring, and accordingly, the float platform FP1 is also an oval ring. Before the float divided body 5 is transported by the equipment barge, as shown in FIGS. 5 (A) and 5 (B), an appropriately shaped rectangular float unit 50 and a curved float unit 50A are combined to form a bolt 50c. And the nut 50d in advance.

  As shown in FIGS. 1, 2, and 16, when the float platform FP1 is installed, the positioning spacer 4 is fixed to the wall surface of the pier 10 with anchor bolts (not shown), and the four float divided bodies 5 are connected to the pier 10 The connecting portion 20 is formed by fixing the slide mechanism 6 to the adjacent float divided body 5 and assembling the work float 2. As a result, the work float 2 can relatively slide and move in the four connecting portions 20 without being separated from each other at the four connecting portions 20, and can take a reduced state and an enlarged state. The work float 2 is a practical work place when assembling the intermediate bodies 70 and 70A for assembling the temporary closing structure 7. The installation of the float platform FP1 is completed by connecting the passage float 3 with a rope near the connecting portion 20 of the float split body 5. The length of the rope is adjusted so that when the connecting portion 20 is opened, the passage float 3 approaches the work float 2 to such an extent that the worker can move on.

  Next, on the float platform FP1 in which the installation is completed, the assembly intermediate 70 (first stage) of the temporary closing structure 7 is assembled. As shown in FIGS. 1, 2 and 16, the worker first moves the slide divisions 5, for example, the float divisions 5 using a work boat, in the directions indicated by arrows N1 and N2 and arrows N5 and N6. The work float 2 (therefore, the float platform FP1) is brought into a reduced state by appropriately sliding in the directions indicated by arrows N3, N4 and arrows N7, N8. In the contracted state, the float platform FP1 can assemble and hold the assembly intermediate 70.

  The worker connects the liner plate 73 in the circumferential direction of the pier 10 using bolts 73c and nuts 73d from inside, assembling the first layer, as shown in FIGS. 11A and 16. As shown in FIGS. 13A to 13D and FIG. 16, a reinforcing member 74 is placed on the first layer, and is connected in the circumferential direction using bolts 73c and nuts 73d. At that time, the attachment plate 77 is fixed to the joint in the circumferential direction with the addressing bolt 73c and the nut 73d. Thereafter, as shown in FIGS. 11A to 11C and FIG. 16, the assembling operation is repeated, and the liner plates 73 are laminated in three layers, and the height is set to 1.5 m. The reinforcing member 74A is placed on the uppermost portion, and is connected in the circumferential direction similarly to the reinforcing member 74.

  Next, as shown in FIGS. 17 and 18, the worker assembles the waterproof cover 7b in the air and attaches the waterproof cover 7b around the intermediate body 70 (first stage) so as to form an integral unit. First, the worker fastens the lower part 78b of each waterproof sheet 78 to the reinforcing member 74 with bolts 73c and nuts 73d, winds the upper part 78e of each waterproof sheet 78 in a roll shape, and attaches the wound winding body 78f to a fixed rope. It is fixed to the temporary fixing portion 70b provided on the assembly intermediate 70 by 78g. Thereafter, the operator attaches the slider 79d to the pair of elements 79b and 79c between the respective waterproof sheets 78 to integrate them. In addition, the upper part 78e of each waterproof sheet 78 may be a folded body folded in a bellows shape.

  Next, as shown in FIG. 19, the operator hooks the hook 84 of the electric chain block 83 on the assembly intermediate 70 (first stage), operates the switch, and temporarily moves from the float platform FP1 in the direction indicated by the arrow N17 ( (Upward, the same applies hereinafter). After that, the worker first slides the adjacent float divided bodies 5 appropriately in the directions indicated by arrows N9 and N10 and arrows N13 and N14 using the workbench, and then moves the arrows N11, N12 and arrow N15. , N16, and the work float 2 (therefore, the float platform FP1) is expanded while maintaining the integrity. Then, the assembly intermediate 70 (first stage) passes between the positioning spacer 4 and the work float 2, and the gap 21 that can descend into water is generated. In this enlarged state, the connecting portions 20 of the adjacent float divided bodies 5 are in a spread state and are dangerous. Therefore, when the worker moves on the float platform FP1, the passage float 3 is used.

  Next, as shown in FIG. 20, the operator performs a switch operation of the electric chain block 83, and turns the assembly intermediate body 70 (first stage) toward the pier foundation 11 with an arrow N18 (downward, the same applies hereinafter). It passes through the gap 21 in the direction shown, and is lowered into the water. At that time, the worker follows the instructions on the location of the diver (not shown, the same applies hereinafter) with the underwater telephone.

  Next, as shown in FIGS. 21 and 22, the assembly intermediate body 70 (first stage) is installed at an appropriate position on the pier foundation 11. When the diver removes the hook 84 of the electric chain block 83 from the intermediate body 70 (first stage), the worker raises the hook 84 to a predetermined position in the direction indicated by the arrow N17. The diver fixes the assembled intermediate body 70 (first stage) to the pier foundation 11 with the anchor bolts 73e, and places the liner plate 73 (height 0. 0) around the pier 10 on the pier foundation 11 inside the assembled intermediate body 70. 5m) is installed as a formwork, and between the formwork and the assembly intermediate 70, an underwater concrete for stopping water is fed and poured from a concrete mixer truck (not shown) stopped on the bridge girder 13. The upper surface 75a of the underwater concrete 75 is higher than the lower end of the waterproof sheet 78. This prevents intrusion of water from a gap formed between the pier foundation 11 and the bottom of the temporary closing structure 7. The placing of the underwater concrete 75 may be performed after laminating all the assembly intermediates 70 and 70A described later.

  Next, as shown in FIG. 23, after installing the assembly intermediate body 70 (first stage), the operator slides each of the float divided bodies 5 by pushing using the workbench in the same manner as described above. The work float 2 is moved to a reduced state, and the assembling work of the second-stage assembly intermediate 70A is performed thereon. Thereafter, the worker temporarily lifts the assembly intermediate body 70A (second stage) in the direction indicated by the arrow 17, and brings the work float 2 into the expanded state again. The diver instructs and guides the worker with an underwater telephone, places the assembly intermediate 70A (second stage) on the assembly intermediate 70 (first stage), and performs the operations shown in FIGS. As shown in (D), a connection operation using a bolt 73c and a nut 73d is performed.

  Next, as shown in FIG. 24, similarly, the worker puts the work float 2 in the contracted state, assembles the third-stage assembly intermediate body 70A, temporarily lifts the work float 2 in the direction indicated by the arrow N17, and enlarges the work float 2. In this state, the assembly intermediate 70A (third stage) is lowered onto the assembly intermediate 70A (second stage) in the direction indicated by the arrow N18, and the diver performs connection work. In the present embodiment, the upper surface of the assembly intermediate 70A (third stage) is located above the water surface W and above the float platform FP1. The construction of the temporary closing structure 7 can be completed here, and if necessary, the liner plate 73 may be further laminated directly on the upper surface of the assembly intermediate 70A (third stage). The connection and fixation of the assembly intermediates 70 and 70A may be performed for each stack of the assembly intermediates 70 and 70A as in the present embodiment, or after the completion of stacking of all the assembly intermediates 70 and 70A. You may do it.

  Next, as shown in FIG. 25, when the installation of the temporary closing structure 7 on the pier foundation 11 is completed, the diver raises each waterproof sheet to the air and places it on the temporary closing structure main body 7a. The waterproof cover 7b is completed by fixing and lifting the slider 79d to the aerial part and closing the waterproof fastener 79 (pulling up the waterproof fastener 79 to the aerial part and closing). Also. The diver appropriately provides supporting rods (cut beams 71 and vertical beams 72) inside the temporary closing structure 7. The fixing of each waterproof sheet on the temporary closing structure main body 7a may be temporary fixing.

  Next, as shown in FIG. 26, the operator removes the float platform FP1 from around the pier 10. Thereafter, the worker takes out the tip 85a of the hose 85 from above the temporary closing structure 7 to drain water from the temporary closing structure 7 by using a submersible pump (not shown) for drainage, and performs work in a dry environment. Reserve space. Of course, the removal operation of the float platform FP1 may be performed after the drainage operation.

  In the temporary closing structure 7, a worker repairs or reinforces the pier. After the repair is completed, the temporary closing structure 7 is removed.

  According to the present embodiment, the temporary closing structure 7 includes the waterproof cover 7b on the outer side surface 7c of the temporary closing structure main body 7a. The waterproof cover 7b can cover the outer side surface 7c of the temporary closing structure main body 7a by a relatively simple operation, and prevents water from leaking into the temporary closing structure 7. Therefore, when connecting the liner plate 73 in the assembling work of the temporary closing structure main body 7a on and under water, it is not necessary to carefully and strongly tighten the bolts 73c and the nuts 73d through the watertight packing. Good. As a result, it is possible to increase the efficiency of the work of installing the temporary closing structure 7, thereby shortening the construction period and reducing the cost.

  In addition, since the temporary closing structure 7 covers the outer side surface 7c of the temporary closing structure main body 7a with the waterproof cover 7b, it is not necessary to strongly tighten the bolts 73c and the nuts 73d with the interposition of a waterproof packing. The deformation of the plate 73 can be prevented. Thus, the liner plate 73 can be reused. From this point as well, it is possible to reduce the cost of constructing the temporary closing structure 7.

  In addition, in the situation where connection work is performed underwater, the diver must work in an unstable position, so when installing the water stoppage seal, the water stoppage seal is easily damaged and the seal leaks easily. was there. According to the present embodiment, water leakage due to such damage to the water-stop packing is prevented by a simple operation of covering the temporary closing structure body 7a with the waterproof cover 7b instead of the water-stop packing. be able to.

  Further, the waterproof cover 7b is provided with a waterproof fastener 79 at the joint 78a, and water leakage into the temporary closing structure body 7a can be prevented only by closing the waterproof fastener 79. Therefore, when connecting the liner plates 73, it is not necessary to carefully and strongly tighten the bolts 73c and the nuts 73d with the intermediary of the waterproof packing. As a result, it is possible to increase the efficiency of the work of installing the temporary closing structure 7, thereby shortening the construction period and reducing the cost.

  Further, the temporary closing structure main body 7a has a reinforcing member 74 for attaching the waterproof sheet 78 at a lower portion (assembly intermediate body 70) of the temporary closing structure main body 7a, and a lower portion 78b of the waterproof sheet 78 has a reinforcing member. 74 attached. When the waterproof cover 7b covers the outer side surface 7c of the temporary closing structure main body 7a, the upper portions 78e of the respective waterproof sheets 78 are pulled up, and the waterproof fasteners 79 are pulled up and closed. You. Thus, the temporary closing structure main body 7a can be covered with the waterproof cover 7b by a simple operation. As a result, it is possible to increase the efficiency of the work of installing the temporary closing structure 7, thereby shortening the construction period and reducing the cost.

  The upper portion 78e of the waterproof sheet 78 is provided on the temporary fixing portion 70b as a rolled-up body 78f or a folded body folded in a bellows shape with the waterproof fastener 79 pulled down and opened. Temporarily fixed. As described above, when the outer side surface 7c of the temporary closing structure main body 7a is covered with the waterproof cover 7b, the waterproof sheet 78 is compactly attached to the temporary closing structure main body 7a. Thereby, the temporary closing structure main body 7a can be easily covered with the waterproof cover 7b. Further, the work of lowering the assembly intermediate 70 can be easily performed. Therefore, the work of covering the outer side surface 7c of the temporary closing structure main body 7a with the waterproof cover 7b can be efficiently advanced. Thereby, it is possible to shorten the construction period and cost of the work of installing the temporary closing structure 7.

  A resin coating layer is formed on the outer surface of the waterproof sheet 78. Therefore, the waterproof sheet 78 has improved waterproofness. As a result, it is possible to improve the prevention of water leakage. Further, the impact resistance of the waterproof sheet 78 is improved by the resin coating layer. As a result, the waterproof sheet 78 has a long life, so that it can be easily reused and cost can be reduced.

  Further, in the construction of the temporary closing structure 7, since the assembly of the assembly intermediates 70 and 70A is performed on the float platform FP1, it is possible to increase the ratio of underwater work while reducing the ratio of underwater work by divers. it can. Therefore, the number of working days for underwater work can be reduced. In addition, the ratio of underwater work by a diver can be reduced while the ratio of underwater work by grasping the assembly state, positioning of members, and confirmation of strain or the like can be increased. Also in this respect, the number of working days for underwater work can be reduced. In addition, since the amount of unloading work from above the water to the water can be reduced, this also becomes a factor that can reduce the number of working days of underwater work by the diver. On the other hand, the number of people who can perform underwater work by divers is limited due to air supply. In contrast, surface operations are less subject to such restrictions. Therefore, if the underwater work is reduced, the total number of work days can be reduced. Accordingly, it is possible to shorten the construction period and reduce the cost in the construction of the temporary closing structure 7. Underwater work has a high risk of accidents. According to the present embodiment, since the number of working days of underwater work can be reduced, danger caused by underwater work can be reduced.

  In addition, the float platform FP1 can be easily assembled on water using a member that can float on water. Furthermore, the float platform FP1 can easily and reliably perform the mutual conversion between the reduced state in which the assembly intermediates 70 and 70A can be assembled and the expanded state in which the assembly intermediate bodies 70 and 70A can descend into the water while maintaining the integrity by the slide mechanism 6. Therefore, the assembling work of the assembling intermediate bodies 70 and 70A and the descent work into the water can be performed smoothly, and the distribution of the water work and the underwater work can be made appropriate. Therefore, construction of the temporary closing structure in water can be performed efficiently. Thus, the number of working days can be reduced. Therefore, it is possible to shorten the construction period and cost for constructing the temporary closing structure 7.

  Further, the float platform FP1 includes a positioning spacer 4. The positioning spacer 4 can suppress the swing of the float platform FP1 during the assembly of the assembly intermediates 70 and 70A. This makes it possible to accurately assemble the intermediate bodies 70 and 70A for assembling the temporary closing structure 7, and to reduce the occurrence of problems such as leakage of seals.

  In addition, the float platform FP1 includes a passage float 3. When the float platform FP1 is in the enlarged state, the connecting portion 20 between the adjacent float divided bodies 5 is in an open state. At this time, the worker moves from the work float 2 to the passage float 3. Thereby, the safety of the worker can be improved.

<Second embodiment>
With reference to FIG. 27, a temporary closing structure 7A according to a second embodiment of the present invention will be described. In the temporary closing structure 7A, components having the same or similar functions as those of the temporary closing structure 7 according to the first embodiment are denoted by the same reference numerals as the temporary closing structure 7. A detailed description of these will be omitted. As shown in FIG. 27, the temporary shutoff structure 7A is characterized in that a bolt mounting hole 78c is not formed in a lower portion 78b of a waterproof sheet 78A, and a provision is made of a clamp 9, a watertight packing 78k, and a holding plate 78l. This is different from the first embodiment. Further, the third embodiment is different from the first embodiment in that an FRP plate 78i and a palm fiber mat 78j are provided.

  The clamp 9 is for attaching the waterproof cover 7b to the temporary closing structure main body 7a. This mounting operation is performed in the air. The clamp 9 includes a main body portion 90, a bolt portion 91, and a handle 92. The main body 90 has a jaw 90a. The bolt part 91 has a tip part 91a. The target object is sandwiched between the jaw part 90a and the tip part 91a. By rotating the handle 92, the object is tightened.

  When attaching the waterproof cover 7b to the temporary closing structure main body 7a, first, the water-stop packing 78k is attached to the surface of the flange 74d outside the reinforcing ring 74. Next, the lower part 78b of the waterproof sheet wound in advance is placed on the surface of the waterproof packing 78k. Furthermore, on the surface of the lower part 78b of the waterproof sheet, a pressing plate 78l is arranged at a predetermined interval (for example, about every 20 cm). The pressing plate 78l is, for example, a square having a side of 50 mm. Of course, the shape may be a rectangle, a circle, an ellipse, an oval, or the like. A band shape may be adopted as the shape of the holding plate 78l. When the pressing plate 78l is band-shaped, the pressing plate 78l presses the lower portion 78b of the waterproof sheet along the circumferential direction. In this case, an interval may be provided between the pressing plates 78l, or may not be provided. The flange 74 d of the reinforcing member 74, the waterproof packing 78 k, the waterproof sheet 78, and the pressing plate 78 l are sandwiched between the jaw portion 90 a of the main body 90 of the clamp 9 and the tip portion 91 a of the bolt 91, and Fixed by rotation. The fixing is performed at a plurality of locations at the predetermined intervals around the temporary closing structure main body 7a. As the clamp 9, specifically, for example, Bulman (registered trademark), Likiman (registered trademark), a giant vise, or the like is used. Further, as the pressing plate 78l, for example, flat steel or the like is used. The water stop packing 78k and the press plate 78l of the present embodiment can be applied to the first embodiment.

  The flanges 74d of the reinforcing rings 74, 74A protrude from the outside of the liner plate 73. A space 78h (for example, about 24 mm) is generated between the waterproof sheet 78A attached to the outside of the flange 74d of the reinforcing rings 74 and 74A and the outside of the liner plate 73. In order to fill this space 78h, a palm fiber mat 78j (about 30 mm thick) is filled between the upper and lower reinforcing rings 74, 74A. The palm fiber mat 78j corresponds to an example of the filler in the present invention. Furthermore, in order to prevent the palm fiber mat 78j from bulging into the uneven portions of the liner plate 73, strip-shaped FRP plates 78i are inserted at equal intervals between the liner plate 73 and the palm fiber mat 78j. The palm fiber mat 78j of the present embodiment is also applicable to the first embodiment.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained.

  In the present embodiment, the clamp 9 is used for attaching the waterproof cover 7b to the temporary closing structure main body 7a. The mounting operation using the clamp 9 is excellent in workability. This makes it possible to improve work efficiency and reliability in the construction of the temporary closing structure 7. Further, it is possible to shorten the construction period and reduce the cost.

  In this embodiment, the gap between the temporary closing structure main body 7a and the waterproof cover 7b is filled with the palm fiber mat 78j. Therefore, elongation of the waterproof sheet 78 due to water pressure can be reduced. This facilitates reuse of the waterproof sheet 78A, and can reduce costs.

<Third embodiment>
The float platforms FP2 and FP3 according to the third embodiment of the present invention will be described with reference to FIGS. In the float platforms FP2 and FP3, components having the same or similar functions as those of the float platform FP1 according to the first embodiment are denoted by the same reference numerals as the float platform FP1. A detailed description of these will be omitted.

  First, as shown in FIG. 28, the float platform FP2 is adapted to the pier 10A, and is configured to be capable of assembling the assembly intermediate body 70B, and includes a work float 2F including the float split body 5A. This is different from the first embodiment and the second embodiment. The assembly intermediate 70B is different from the assembly intermediate 70 in the shape presented in plan view.

  As shown in FIGS. 28 and 29, the work float 2A is manufactured by connecting four float divided bodies 5A. The float split body 5A includes a straight portion 55 and a curved portion 56A. The linear portion 55 is manufactured by connecting rectangular float units 50 having a rectangular parallelepiped shape, and the length can be adjusted according to the number of connected rectangular float units 50. The rectangular float unit 50 has a square shape in plan view. The curved portion 56A is manufactured by combining two rectangular float units 50 having a rectangular parallelepiped shape and two curved shape generating spacers 50B having a triangular prism shape. The curved shape generating spacer 50B has a triangular shape in plan view. One corner 57a of the curved shape generating spacer 50B is arranged inside the work float 2A, and the other two corners 57b and 57c are arranged outside. The angles of these corners 57a, 57b, 57c can be changed. The curved portion 56A is formed in accordance with the outer shape of the pier 10A by connecting the curved shape generating spacer 50A in which the angles of the corners 57a, 57b, 57c are adjusted to the adjacent rectangular float unit 50. The rectangular float unit 50 is not limited to a square shape in plan view, but may be another rectangular shape such as a rectangular shape.

  The number of the curved shape generating spacers 50B used to manufacture the float split body 5A is not limited to two, but one, three, five, six, seven, Eight, nine, or more. It is also possible to connect a plurality of curved shape generating spacers 50B adjacent to each other. The curved shape generating spacer 50B is connected to the adjacent rectangular float unit 50 or the curved shape generating spacer 50B using, for example, bolts and nuts.

  As shown in FIG. 30, the curved shape generating spacer 50B includes a wooden scaffold plate 58 as a working plate and a frame portion 59. The wooden scaffolding plate 58 is for making the upper surface of the curved shape generating spacer 50B flat, thereby facilitating the operation on the float platform FP2. The wooden scaffolding plate 58 has a bolt mounting hole 58a for fixing to the frame portion 59.

  The work plate is not limited to wood, but may be made of metal, FRP, rubber, or resin, and is preferably grating. Examples of the metal include iron, stainless steel, and aluminum. Examples of the resin include vinyl chloride, polypropylene, and polyethylene.

  The frame portion 59 includes frame members 59a and 59b, hinges 59c, a sliding plate 59e, and a sliding portion spacer 59f. Hinges 59c are arranged at the corners 57a, 57b, 57c, respectively.

  The frame members 59 a are for forming both side portions of the frame portion 59. The hinge 59c has a blade 59i and a shaft 59j, and the blade 59i rotates around the shaft 59j, whereby the angles of the corners 57a, 57b, and 57c can be changed. On each side, two frame members 59a are fixed by bolts 59g and nuts 59h at the upper and lower ends of the blades 59i of the hinges 59c arranged at the corners 57a, 57b, 57c, and connect the hinges 59c to each other. ing.

  The frame material 59b is for forming the front surface of the frame portion 59. Two frame members 59b are fixed at upper and lower ends of a blade 59i of a hinge 59c at a corner 57b by bolts 59g and nuts 59h. The frame member 59b has a rail portion 59k for sliding a sliding portion 59l described later. The frame members 59a and 59b form the triangular sides.

  The frame portion 59 has a sliding portion 59l at the corner 57c. The sliding plate 59e, in combination with the sliding portion spacer 59f and the blade 59i of the hinge 59c, forms a sliding portion 59l that slides on the rail portion 59k. The sliding plate 59e is fixed with the blade 59i of the hinge 59c and the bolt 59g / nut 59h via the sliding portion spacer 59f. As a result, grooves are formed at the upper and lower ends of the sliding plate 59e to form a sliding portion 59l. By inserting the sliding portion 59l into the rail portions 59k of the upper and lower frame members 59b, the sliding portion 59l can slide on the rail portions 59k in the directions indicated by arrows N19 and N20. By sliding, the length of the triangular side formed by the frame member 59b can be adjusted.

  As shown in FIG. 31A, when the sliding portion 59l is slid in the direction indicated by the arrow N19, the angle of the corner 57a increases, and the angles of the corners 57b and 57c decrease. At the same time, the length of the triangular side formed by the frame member 59b increases. Conversely, as shown in FIG. 31B, when the sliding portion 59l is slid in the direction indicated by the arrow N20, the angle of the corner 57a becomes smaller than in the state shown in FIG. The angles of the portions 57b and 57c are increased. At the same time, the length of the triangular side formed by the frame member 59b is reduced.

  The sliding portion 59l may be provided not at the corner 57c but at the corner 57b. Alternatively, the sliding portions 59l may be provided at a plurality of locations. For example, the sliding portions 59l may be provided at the corners 57b and 57c.

  When the lengths of the two frame members 59a are equal, the triangular shape is an isosceles triangle. The frame material 59b corresponds to the base of the isosceles triangle. The corner 57a formed by the two frame members 59a is an apex angle, and the remaining two corners 57b and 57c are a base angle.

  The wooden scaffolding plate 58 is formed so as to conform to the shape of the curved shape generating spacer 50C in which the angles of the corners 57a, 57b, 57c are adjusted. As shown in FIG. 30, the frame members 59a and 59b have bolt mounting holes 59d at positions corresponding to the bolt mounting holes 58a of the wooden scaffold plate 58. The wooden scaffold plate 58 and the frame portion 59 are connected by bolts 58b. A plurality of bolt mounting holes 59d are formed in the frame material 59b so as to correspond to different shapes of the wooden scaffold plate 58.

  The curved shape generation spacer 50 </ b> B may have a two-layer structure, similarly to the rectangular float unit 50. In this case, in the lower layer of the two-layer structure, for example, styrene foam for giving buoyancy to the curved shape generating spacer 50C is housed. This styrofoam is formed according to the shape of the curved shape generating spacer 50C. The upper layer houses, for example, the slide mechanism 6 described in the first embodiment.

  Next, referring to FIG. 32, a float platform FP3 using the curved shape generation spacer 50B shown in FIG. 31B will be described. The pier 10B is larger than the pier 10A. The float platform FP3 is adapted to the pier 10B and is configured to be capable of assembling the assembly intermediate 70C, and includes a work float 2B including a float split body 5B. The assembly intermediate 70C differs from the assembly intermediate 70 or the assembly intermediate 70B in the shape presented in plan view.

  As shown in FIG. 32, the float split body 5B includes a straight portion 55 and a curved portion 56B. Two linear float units 50 having a rectangular parallelepiped shape are connected to the linear portion 55. The length of the linear portion 55 can be adjusted by the number of the rectangular float units 50 to be connected. The rectangular float unit 50 has a square shape in plan view. On the other hand, the curved portion 56B is manufactured by combining a rectangular float unit 50 having a rectangular parallelepiped shape and a curved shape generating spacer 50B. As described above, the curved shape generating spacer 50B has a smaller angle of the corner 57a and a larger angle of the corners 57b and 57c than the float platform FP2, and the length of the triangular side formed by the frame member 59b. Is getting smaller. Four rectangular float units 50 and three curved shape generating spacers 50B are alternately connected. By changing the number of connections of the rectangular float unit 50 and the curved shape generating spacer 50C, and the angles of the corners 57a, 57b, 57c and the length of the side, the curved shape 56A can be changed to curved shapes 56B having different degrees of curvature. Be changed.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained.

  The float split bodies 5A and 5B of the float platforms FP2 and FP3 are formed in accordance with the cross-sectional shapes of the piers 10A and 10B by combining members having a simple shape such as the rectangular float unit 50 and the curved shape generating spacer 50B. can do. Therefore, the burden of preparing the float platforms FP2 and FP3 can be reduced. Thus, it is possible to shorten the construction period of the temporary closing structure 7 and reduce the cost.

  The curved shape generating spacer 50B can change the angles of the corners 57a, 57b, and 57c and the length of the triangular side formed by the frame member 59b by sliding the sliding portion 59l. Therefore, the curved shape generating spacer 50B and the rectangular float unit 50, which are common members, can be used to construct the float platforms FP2 and FP3 adapted to the piers 10A and 10B having different cross-sectional shapes. Therefore, the necessity of preparing a new member can be reduced. Thereby, when constructing the temporary closing structure 7, it is possible to shorten the construction period and reduce the cost.

<Fourth embodiment>
The fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment corresponds to a modification of the third embodiment. The fourth embodiment is different from the third embodiment in that a curved shape generating spacer 50C is used instead of the curved shape generating spacer 50B. In the curved shape generating spacer 50C, components having the same or similar functions as the components of the curved shape generating spacer 50B are denoted by the same reference numerals. A detailed description of these will be omitted.

  As shown in FIG. 33, the curved shape generating spacer 50C has a quadrangular prism shape, and has a trapezoidal shape in plan view. The longer base of the trapezoidal shape is, for example, arranged on the side corresponding to the outside of the work floats 2A, 2B in the third embodiment, and the shorter base is the side corresponding to the inside of the work floats 2A, 2B. Placed in The curved shape generating spacer 50C includes a wooden scaffold plate 58A as a working plate and a frame portion 59A.

  The wooden scaffolding plate 58A is for making the upper surface of the curved shape generating spacer 50C flat, and for facilitating the work thereon. The work plate is not limited to wood, but may be made of metal, FRP, rubber, or resin, and is preferably grating. Examples of the metal include iron, stainless steel, and aluminum. Examples of the resin include vinyl chloride, polypropylene, and polyethylene.

  The frame portion 59A includes frame members 59a, 59b, 59m, hinges 59c, sliding plates 59e, and sliding portion spacers 59f. Hinges 59c are arranged at the corners 57a, 57b, 57c, 57d, respectively. The frame members 59a are for forming both side portions of the frame portion 59A. The hinge 59c has a blade 59i and a shaft 59j, and the blade 59i rotates around the shaft 59j, whereby the angles of the corners 57a, 57b, 57c, and 57d can be changed. On each side, two frame members 59a are fixed by bolts 59g and nuts 59h at upper and lower ends of a blade 59i of a hinge 59c arranged at each corner 57a, 57b, 57c, 57d. Connected.

  The frame material 59b is for forming the front surface of the frame portion 59A, and forms the longer base of the trapezoidal shape. Two frame members 59b are fixed at upper and lower ends of a blade 59i of a hinge 59c at a corner 57b by bolts 59g and nuts 59h. The frame portion 59A has a sliding portion 59l at a corner 57c, like the frame portion 59. By inserting the rail portions 59k of the upper and lower frame members 59b into the sliding portions 59l, the sliding portions 59l slide on the rail portions 59k in the directions indicated by arrows N19 and N20. By sliding, the length of the longer side of the trapezoidal shape formed by the frame member 59b can be adjusted. The frame members 59a, 59b, 59m form the trapezoidal sides.

  When the sliding portion 59l is slid in the direction indicated by the arrow N19, the angles of the corners 57a and 57d increase, and the angles of the corners 57b and 57c decrease. At the same time, the length of the longer side formed by the frame member 59b increases. Conversely, when the sliding portion 59l is slid in the direction indicated by the arrow N20, the angles of the corners 57a and 57d become smaller, and the angles of the corners 57b and 57c become larger. At the same time, the length of the longer side formed by the frame member 59b becomes smaller.

  The wooden scaffold plate 58A is formed so as to conform to the shape in plan view of the frame portion 59A in which the angles of the corners 57a, 57b, 57c, 57d are adjusted. The frame members 59a, 59b, 59m have bolt mounting holes 59d at positions corresponding to the bolt mounting holes 58a of the wooden scaffold plate 58A. The wooden scaffold plate 58A and the frame portion 59A are connected by bolts 58b. A plurality of bolt mounting holes 59d are formed in the frame material 59b so as to correspond to different shapes of the wooden scaffold plate 58A.

  The sliding portion 59l may be provided at the corner 57a, the corner 57b, or the corner 57d instead of the corner 57c. Further, the sliding portions 59l may be provided at a plurality of locations. For example, the sliding portions 59l may be provided at the corners 57b and 57c. Alternatively, the sliding portions 59l may be provided at the corners 57c and 57a. Alternatively, the sliding portions 59l may be provided at the corners 57c and 57d. Alternatively, the sliding portion 59l may be provided at the corner 57b and the corner 57a. Alternatively, the sliding portions 59l may be provided at the corners 57b and 57d. Alternatively, the sliding portions 59l may be provided at the corners 57a and 57d. Alternatively, the sliding portion 59l may be provided at the corners 57b, 57c, and 57a. Alternatively, the sliding portion 59l may be provided at the corners 57b, 57c, and 57d. Alternatively, the sliding portion 59l may be provided at the corners 57b, 57a, and 57d. Alternatively, the sliding portion 59l may be provided at the corners 57c, 57a, and 57d. Alternatively, the sliding portion 59l may be provided at the corners 57b, 57c, 57a, and 57d.

  The curved shape generating spacer 50C is not limited to a trapezoidal shape in plan view, and may be a square shape. One side of the square is disposed on the side corresponding to the outside of the work floats 2A and 2B in the third embodiment, for example, and the opposite side of the one side of the square is the side corresponding to the inside of the work floats 2A and 2B. Are located in The length of the one side of the quadrangular shape is set to be larger than the length of the opposite side.

  According to the present embodiment, the same effects as those of the third embodiment can be obtained.

  The present invention is not limited to the contents of the above-described embodiment. The specific structure of the temporary closing structure, the method of constructing the temporary closing structure, and the platform used for the temporary closing structure according to the present invention can be variously changed in design. In addition, the features shown in the above-described embodiments can be applied to other embodiments as long as they do not conflict with each other.

  In the above embodiment, the construction of the temporary deadline structure when the pier in the river is repaired has been described. The present invention is also applicable to underwater structures other than piers. Specific examples of the underwater structure include a sluice gate and the like. The present invention can of course be applied to the construction of a temporary closing structure at the time of repairing not only underwater structures such as piers in rivers but also underwater structures including piers such as seas and lakes.

  The number of stacked intermediate bodies for assembling the temporary closing structure can be set as appropriate. Further, the number of laminated liner plates as the assembly intermediate can be arbitrarily set to one layer, two layers, three layers, four layers, five layers, and the like. The number of liner plates used in the circumferential direction can also be set arbitrarily.

  The waterproof sheet attaching portion may be provided not at the lower portion of the temporary closing structure main body but at the upper portion of the temporary closing structure main body. In this case, the waterproof cover is in a state where the upper part of at least one waterproof sheet is attached to the waterproof sheet attaching part, the lower part of the at least one waterproof sheet is pulled down, and the waterproof fastener is pulled down and closed. , Covering the outer side surface of the temporary closing structure main body.

  The water leakage prevention joining means is not limited to the waterproof fastener, and various modifications can be made as long as the joint between the sheet ends of the waterproof sheet can be joined so as to prevent water leakage. As another example of the water leakage prevention joining means, for example, a sheet end of the waterproof sheet is fastened to the temporary closing structure body using a bolt.

  The work platform may be provided around the entire height of the pier at a predetermined height. The predetermined height is preferably a position higher than the water surface. This platform is configured such that an outer peripheral portion thereof can be separated by a required length or bendable, and based on this, an expanded state in which an assembly intermediate of the temporary closing structure can be assembled thereon and the assembly intermediate can be assembled. A reduced state that can be passed and lowered can be taken.

  The shape in plan view of the curved shape generating spacer described in the third and fourth embodiments is not limited to a triangular shape or a quadrangular shape like the curved shape generating spacers 50C and 50D. It may have a pentagonal, hexagonal, heptagonal, octagonal, or more polygonal shape. The polygonal shape has at least three corners and at least three sides connecting each of the at least three corners in plan view. Each of the corners is configured to be capable of changing an angle, at least two of the at least three corners are arranged outside the work float, and at least one corner is inside the work float. The side that is arranged and connects the at least two corners arranged outside the work float is configured to be variable in length, and connects the angle of each of the corners and the at least two corners. The degree of curvature of the curved portion is adjusted by changing the length of the side.

  Shaped steel such as L-shaped steel can also be used as the curved shape generating spacer. For example, an L-shaped steel cut to an appropriate length may be directly fixed to the rectangular float unit 50 using bolts or the like, so that the curved portion has a desired degree of curvature.

FP1, FP2, FP3 Float platform (work platform)
10,10A, 10B Pier (underwater structure)
7 Temporary cutoff structure 7a Temporary cutoff structure main body 7b Waterproof cover 7c Outer side surfaces 70, 70A, 70B, 70C Assembly intermediate 70b Temporary fixing portion 74 Reinforcing member (waterproof sheet attaching portion)
78, 78A Tarpaulin 78a Seam 78b Lower part 78e of tarpaulin Upper part 78f of tarpaulin Winding body 78j Palm fiber mat (filling material)
79 Waterproof fasteners (Joint means to prevent water leakage)

Claims (10)

A temporary closing structure constructed around the underwater structure,
A temporary closing structure main body constructed to be at a predetermined height around the underwater structure,
The provided so as to cover the outer surface of the temporary shut-off structure body, Bei example and a waterproof cover to prevent water leakage into the interior of the provisional deadline structure body,
The waterproof cover includes at least one waterproof sheet arranged along a circumferential direction of the outer surface of the temporary closing structure body, and the at least one waterproof sheet when the at least one waterproof sheet is arranged on the outer surface. A seam formed between the sheet ends of the waterproof sheet, and a water leakage prevention joining means for joining the seam so as to prevent water leakage from the seam,
The water leakage prevention joining means is a waterproof fastener provided at the joint,
The waterproof fastener joins the joint in a closed state and makes the joint waterproof, and the joint is separated in an open state.
The temporary closing structure main body includes a waterproof sheet attaching portion for attaching the at least one waterproof sheet,
The waterproof sheet mounting portion is provided at a lower portion of the temporary closing structure body,
The waterproof cover may be configured such that a lower portion of the at least one waterproof sheet is attached to the waterproof sheet attaching portion, an upper portion of the at least one waterproof sheet is pulled upward, and the waterproof fastener is pulled upward and closed. , Covering the outer side surface of the temporary closing structure body,
The temporary closing structure main body is provided above the waterproof sheet attaching portion, and the upper part of the at least one waterproof sheet is wound in a roll shape with the waterproof fastener pulled down and opened. A temporary closing structure including a temporary fixing portion for temporarily fixing as a take-off body or a folded body folded in a bellows shape . The temporary deadline structure the outer surface of the body and comprises a space between the waterproof cover, wherein the space is filled with filling material, temporary deadline structure according to claim 1. The temporary closing structure according to claim 2 , wherein the filler is a coconut fiber mat. The temporary shutoff structure according to any one of claims 1 to 3 , wherein the waterproof cover includes a resin coating layer. The temporary closing structure according to claim 4 , wherein the resin coating layer includes a polyurea resin. A method of constructing a temporary closing structure constructed around an underwater structure,
The temporary closing structure includes a temporary closing structure main body, and a waterproof cover for preventing water from leaking into the temporary closing structure main body.
A construction step of constructing the temporary closing structure main body around the underwater structure so as to have a predetermined height,
The outer surface of the temporary shut-off structure body have a, and Kutsugae設step of covering with the waterproof cover,
The waterproof cover includes at least one waterproof sheet, and a water leakage prevention joining unit for joining so as to prevent leakage from a seam formed between sheet ends of the at least one waterproof sheet,
In the covering step, the at least one waterproof sheet is formed in the temporary closing structure so that the seam is formed between the sheet ends of the at least one waterproof sheet when the outer surface is covered with the waterproof cover. An arrangement step of disposing along the circumferential direction of the body body, and a joining step of joining the seam formed in the arrangement step by the water leakage prevention joining means,
The arranging step includes a waterproof sheet attaching step of attaching the at least one waterproof sheet to a waterproof sheet attaching portion provided on the temporary closing structure body,
The waterproof sheet mounting portion is provided at a lower portion of the temporary closing structure body,
In the waterproof sheet attaching step, a lower portion of the at least one waterproof sheet is attached to a waterproof sheet attaching portion,
The water leakage prevention joining means is a waterproof fastener provided at the joint,
In the waterproof sheet attaching step, the upper part of the at least one waterproof sheet is rolled up or a folded body folded in a bellows shape in an opened state by lowering the waterproof fastener downward. Temporary fixing step of temporarily fixing to a temporary fixing part provided above the waterproof sheet mounting part,
In the joining step, the joining of the joint is performed by closing the waterproof fastener, and by pulling up the at least one waterproof sheet upward and closing the waterproof fastener by pulling up the waterproof fastener , Construction method. The joining step is performed after the temporary closing structure main body reaches the predetermined height,
7. The method of claim 6 , wherein in the joining step, the lifting of the waterproof sheet is performed while unwinding the wound body or the folded portion. 8. The temporary closing structure main body includes an assembly intermediate assembled around the underwater structure,
The construction step includes a work platform setting step of setting a work platform formed at a predetermined height to surround the underwater structure and used to assemble the assembly intermediate thereon.
The work platform is capable of changing a contracted state and an expanded state around the underwater structure so as to be changeable, and based on the first state, the work platform can assemble the assembly intermediate body and hold the assembly intermediate body. State and a second state that can pass through the assembly intermediate and be lowered into the water,
In the construction step, the work platform is set to the first state, an assembly step of assembling the assembly intermediate body, the assembly intermediate body is temporarily lifted from the work platform to a predetermined height, and the work platform is moved to the second state. State, and a lowering step of lowering the assembled intermediate body into water, an installation step of installing the assembled intermediate body lowered into water on a foundation of the underwater structure, and repeatedly performing the assembling step and the lowering step The method according to claim 6 , further comprising: laminating the assembled intermediate body until the temporary closing structure main body reaches the predetermined height. When the assembling step is the first stage corresponding to the lower part of the temporary closing structure main body, the assembling intermediate body includes a waterproof sheet attaching section installing step of providing the waterproof sheet attaching section,
The method according to claim 8 , wherein the step of attaching the waterproof sheet is performed on the work platform in the first state. It is a waterproof cover used for the construction method of the temporary closing structure according to any one of claims 6 to 9 , wherein the waterproof cover covers the outer side surface of the temporary closing structure body.

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