JP6664682B1 - Float platform and construction method of temporary closing structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float platform suitable for construction of a temporary deadline structure. SOLUTION: Float platforms FP1 to FP8 include work floats 2 to 2G around piers 10 to 10B. The work floats 2 to 2G are capable of mutually changing a contracted state and an expanded state, and based on that, a first state in which the assembly intermediate bodies 70 to 70C can be assembled and held, and a first state in which the assembly intermediate bodies 70 to 70C can be lowered into water. 2 states and includes at least two float divisions 5-5D arranged adjacent to each other around the piers 10-10B, wherein at least two float divisions 5-5D separate from each other. Thereby, the contracted state and the expanded state are generated, and at least one float division body 5-5D among at least two float division bodies 5-5D has the shape of the assembly intermediate body 70-70C in the first state. It has a curved portion that is formed to fit. [Selection diagram] Fig. 1

Description

  The present invention relates to a float platform used for the construction of a temporary deadline structure to be constructed when repairing or repairing an underwater structure such as a pier provided in water such as a river or the sea, and a temporary deadline using the same. The present invention relates to a construction method for a structure.

  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 work space, it is necessary to provide a dry environment without water around the underwater structure, and this dry environment is a cylindrical temporary closing structure with a predetermined space around the underwater structure. Made by building the body and excluding water from inside it. In general, this temporary closing structure is configured such that a plurality of members such as a liner plate that can be interconnected vertically and circumferentially of the underwater structure are arranged in a tubular shape around the underwater structure and interconnected. (See, for example, Patent Document 1). In constructing a temporary closing structure, a barge is floated so as to surround an underwater structure, and is used as a scaffold for assembling a cylindrical assembly intermediate (for example, see Patent Document 2 or 3). .

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

  That is, there was a problem that the barge did not have a configuration suitable for constructing a temporary closing structure.

JP-A-11-21908 JP-A-10-195883 Japanese Patent No. 6274688

  The present invention has been devised under the circumstances described above, and has as its object to provide a float platform having a configuration suitable for constructing a temporary closing structure.

The float platform provided by the first aspect of the present invention is used for installation of a temporary closing structure including an assembly intermediate assembled around an underwater structure and at least partially having a curved shape. A floating platform, constructed around the underwater structure, configured to surround the underwater structure and used thereon to assemble the assembly intermediate. The work float can be configured to be interchangeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and the assembly intermediate And a second state capable of passing through the assembly intermediate and descending into the water. Comprising at least two float segments arranged adjacent to each other around the underwater structure, wherein the at least two float segments are separated from each other to produce the reduced state and the expanded state, at least two of the at least one float divided body of the float divided body, possess the assembly intermediate curved portion formed to fit the shape of the said first state, said curved portion, said curved The curved portion includes a curved shape generating spacer for generating a curved shape, the curved shape portion has a rectangular shape in plan view and further includes a rectangular float unit for imparting buoyancy to the work float, the curved shape generating spacer, It is characterized that you are formed by combining the said rectangular float unit.

  Preferably, the curved shape generating spacer has a polygonal shape having at least three corners and at least three sides connecting each of the at least three corners in plan view.

  Preferably, each of the corners is configured to be changeable in angle, at least two of the at least three corners are arranged outside the work float, and at least one of the corners is the work float. The side connecting the at least two corners disposed inside the work float and connecting the at least two corners is configured to be variable in length, the angle of each corner and the angle of the at least two corners. By changing the length of the side connecting the corners of the curved portion, the degree of curvature of the curved portion can be adjusted.

  Preferably, the polygonal shape has a triangular shape.

  Preferably, the triangular shape is an isosceles triangle having the base connecting the corners arranged on the outside of the work float as a base.

The float platform provided by the second aspect of the present invention is used for installation of a temporary closing structure including an assembly intermediate assembled around an underwater structure and having at least a part having a curved shape. A floating platform, constructed around the underwater structure, configured to surround the underwater structure and used thereon to assemble the assembly intermediate. The work float can be configured to be interchangeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and the assembly intermediate And a second state capable of passing through the assembly intermediate and descending into the water. Comprising at least two float segments arranged adjacent to each other around the underwater structure, wherein the at least two float segments are separated from each other to produce the reduced state and the expanded state, at least two of the at least one float divided body of the float divided body, possess the assembly intermediate curved portion formed to fit the shape of the said first state, the working float, at least 2 The expandable and contractible connecting means for connecting adjacent float divided bodies of the float divided body and expanding and contracting with each other, and a connecting portion formed between the adjacent float divided bodies by the expandable and contractible connecting means; The means expands and contracts at the connecting portion, and separates the adjacent float divided bodies by sliding relative to each other. It is characterized by causing the collapsed state and the expanded state.

Preferably, the work float further includes a passage float disposed outside the connection portion of the work float and in contact with the adjacent float divided body so as to form a detour when the connection portion is opened. .

The float platform provided by the third aspect of the present invention is used for installation of a temporary closing structure including an assembly intermediate assembled around an underwater structure and at least partially having a curved shape. A floating platform, constructed around the underwater structure, configured to surround the underwater structure and used thereon to assemble the assembly intermediate. The work float can be configured to be interchangeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and the assembly intermediate And a second state capable of passing through the assembly intermediate and descending into the water. Comprising at least two float splits arranged adjacent to each other around the underwater structure, wherein the at least two float splits are separated from each other to produce the reduced state and the expanded state, at least two of the at least one float divided body of the float divided body, possess the assembly intermediate curved portion formed to fit the shape of the said first state, the working float and the underwater structure And a positioning spacer attached to the underwater structure, abutting on the inside of the work float in the first state, and positioning the work float.

Preferably, in the float platform provided by any one of the first to third aspects of the present invention, the work float is configured to repeatedly convert the first state and the second state to each other. It is configured to enable the assembly intermediate to be laminated on the foundation of the underwater structure.

The method for constructing a temporary closing structure provided by the fourth aspect of the present invention is a method for constructing a temporary closing structure using a float platform provided by any one of the first to third aspects of the present invention. And setting the work float in the first state, assembling the assembly intermediate, temporarily lifting the assembly intermediate from the work float to a predetermined height, and setting the float platform in the second state. And a lowering step of lowering the assembled intermediate body in water, and an installation step of installing the assembled intermediate body lowered in water on a foundation of the underwater structure.

  The present invention has been devised under the circumstances described above, and can provide a float platform having a configuration suitable for constructing a temporary closing structure.

  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 a front view and a 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. 8A is a sectional view taken along the line VIIIA-VIIIA in FIG. FIG. 8B is a sectional view taken along the line VIIIB-VIIIB in FIG. FIG. 9A is a perspective view illustrating an example of a liner plate included in the temporary closing structure illustrated in FIG. 7. FIG. 9B is a cross-sectional view taken along the line IXB-IXB of FIG. FIG. 10A is a cross-sectional view in a plan view showing an assembled state of the connecting portions of the left and right liner plates included in the temporary closing structure shown in FIG. FIG. 10B is a side sectional view showing the assembled state of the connecting portions of the upper and lower liner plates. FIG. 10C is a front view showing the assembled state of the connecting portions of the upper, lower, left, and right liner plates as viewed from the inside of the temporary closing structure. It is a perspective view which shows an example of the reinforcement member contained in the temporary closing structure shown in FIG. FIG. 12A is a side cross-sectional view showing an assembled state of a connecting portion between the upper and lower liner plates included in the temporary closing structure shown in FIG. 7 and the reinforcing member. FIG. 12B is a front view showing the attachment plate of the reinforcing member. FIG. 12C is a side sectional view showing an assembled state when the attachment plate is applied to the reinforcing member. FIG. 12D is a front view showing an assembled state of the connecting portions of the left and right reinforcing members. FIG. 12E is a side cross-sectional view showing the assembled state of the connecting portion between the upper and lower liner plates and the reinforcing member in the vicinity of the connecting portion between the left and right reinforcing members. FIG. 13 is a diagram for explaining an example of an operation for constructing the temporary closing structure shown in FIG. 7, and is a front view showing a “suspension scaffold” on an upper pier and a “float platform” installed on a pier. It is. 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. 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. 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 mounted on an assembly intermediate (second stage) connected and fixed to an assembly intermediate (first stage). Similarly, it is a perspective view showing a state where supporting rods (cut beams and vertical beams) are provided inside the temporary closing structure. 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 top view showing the float platform concerning a 2nd embodiment of the present invention. FIG. 23 is a plan view showing an enlarged state of the float platform shown in FIG. 22. It is a top view showing the float platform concerning a 3rd embodiment of the present invention. FIG. 25 is a plan view showing a reduced state of the float platform shown in FIG. 24. FIG. 26 (A) is a cross-sectional view in plan view showing a connecting portion of two adjacent float split bodies included in the float platform according to the fourth embodiment of the present invention. FIG. 26 (B) is a cross-sectional view in plan view showing a state where a connecting portion between two adjacent float split bodies shown in FIG. 26 (A) is open. FIG. 27A is a cross-sectional view in plan view showing a connecting portion of two float divided bodies included in the float platform according to the fifth embodiment of the present invention. FIG. 27 (B) is a cross-sectional view in plan view showing a state where the connecting portion of the two float split bodies shown in FIG. 27 (A) is open. FIG. 28A is a cross-sectional view in plan view showing a connecting portion of two float divided bodies included in the float platform according to the sixth embodiment of the present invention. FIG. 28 (B) is a cross-sectional view in plan view showing a state where the connecting portion of the two float divided bodies shown in FIG. 28 (A) is open. It is a top view showing an example of a float platform concerning a 7th embodiment of the present invention. FIG. 30 is a perspective view showing an example of a float divided body constituting the float platform shown in FIG. 29. FIG. 31 is a perspective view illustrating an example of a curved shape generation spacer included in the float split body illustrated in FIG. 30. FIG. 32A is a plan view showing one state of the curved shape generating spacer shown in FIG. FIG. 32B is a plan view illustrating another state of the curved shape generation spacer illustrated in FIG. 31. FIG. 33 is a plan view showing an example of a float platform using the curved shape generating spacer shown in FIG. 32 (B). It is a perspective view showing an example of the curved shape generation spacer concerning an 8th 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]
The float platform according to the present invention is used for the construction of a temporary deadline structure to be constructed when repairing and repairing underwater structures such as piers provided in water such as rivers and seas, and the like. Then, an intermediate body for assembling a temporary closing structure described later is assembled thereon. 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 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. Here, the pier 10 corresponds to an example of an underwater structure 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 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. The number of the float divided bodies 5 forming the float platform FP1 is not limited to four, and may be at least two or more. Specifically, the number of the float divided bodies 5 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 FIG. 6 (B) or FIG. 6 (C), 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 slides in the slide pipe 60 in the direction indicated by the arrow N1 and is inserted deeply, the two adjacent float divided bodies 5 relatively move to the arrow N1. And as a result of sliding movement in the direction indicated by the arrow N2, the connecting portion 20 is closed. 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 65a provided at the tip of the slide bar 61 and an end 65b of the slide pipe 62. It is composed of In the connecting portion 20, when the adjacent float divided bodies 5 relatively slide and move in the directions indicated by arrows N9 and N10 so as to increase the interval therebetween, the contact plate 65a contacts the end 65b. 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 2b 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, 8A, and 8B 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 liner plate 73 having a predetermined curvature or a linear shape, and a reinforcing member 74 connecting the upper and lower liner plates 73. The reinforcing member 74 also has a predetermined curvature or a linear shape. As shown in FIGS. 8 (A) and 8 (B), concrete 75 for waterproofing is cast 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.

  FIGS. 9A and 9B 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. 9 (A), bolt mounting holes 73b for mounting bolts are provided in upper, lower, left and right end flanges 73a of the liner plate 73. As shown in FIG. 9B, 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. 10 (A) and 10 (C), the connection of each liner plate 73 in the circumferential direction is performed by interposing a water-stop packing 76 and connecting left and right end flanges 73 a with bolts 73 c and nuts 73 d. It is done by stopping. In addition, as shown in FIGS. 10B and 10C, the upper and lower end flanges 73a of the liner plate 73 are connected to each other by interposing a water-stop packing 76 as shown in FIGS. This is performed by fixing the bolt 73c and the nut 73d. In addition, as shown in FIG. 10 (C), the seam in the circumferential direction between the liner plates 73 does not necessarily have to be aligned in the up-down direction.

  FIG. 11 shows an example of 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 74b for mounting a bolt to the web 74a. The flange 74c of the reinforcing member 74 is provided with a bolt mounting hole 74d for mounting an attachment plate 77 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.

  As shown in FIG. 12 (A), in the construction of the temporary closing structure 7, the reinforcing member 74 is provided with the web 74 a and the upper and lower ends of the liner plate 73 for each appropriate number of connection of the liner plates 73 stacked in the vertical direction. A bolt 73c and a nut 73d are fixed to the flange 73a with a water-stop packing 76 interposed therebetween. As shown in FIGS. 12 (B) and 12 (C), at the seam of the reinforcing member 74 in the circumferential direction, the attachment plate 77 is applied to the flange 74c, and FIGS. 12 (D) and 12 (E). As shown in (1), a water stop packing 76 is interposed between the web end faces 74e of the reinforcing members 74. As shown in FIG. 12B, the attachment plate 77 is provided with a bolt mounting hole 77a for mounting the bolt 73c.

  As shown in FIG. 7 and FIG. 8 (B), in the construction of the temporary closing structure 7 of the present embodiment, three ring bodies in which the liner plate 73 and the reinforcing member 74 are connected in the circumferential direction of the pier 10 are laminated. Is an assembly intermediate 70. The height (the number of stacked annular bodies) of the assembly intermediate body 70 is appropriately determined in consideration of the workability on the float platform FP1 and the like, as well as the lowering operation described below can be performed smoothly. For example, if the height of the liner plate 73 (the height in the vertical direction in FIG. 9A) is 500 mm, three laminations (1.5 m) are set based on the ease of work of the operator. Note that the number of liner plates 73 stacked in the assembly intermediate 70 is not limited to three, and may be one, two, four, five, six, or more. Further, the temporary closing structure 7 is formed by laminating an appropriate number of assembly intermediate bodies 70 according to the water depth (three stages in the present embodiment). The temporary cutoff 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.

[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. 13, 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 a worker (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. 14, two support structures 8 are installed on the suspension scaffold SS (not shown in FIG. 14), one on each side 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 suspended by the wire 82, and a pair of suspension hooks 84 are provided on a suspension 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 intermediate body 70 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 FIGS. 13 and 14, the worker installs the work float platform FP <b> 1, and then 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 14, when the float platform FP1 is installed, the positioning spacer 4 is fixed to the wall 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 floats 2 can be separated from each other by sliding relative to each other at the four connection portions 20 without being separated from each other at the four connecting portions 20, and can be in a contracted state and an enlarged state. The work float 2 is a practical work place when assembling the intermediate body 70 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 the passage float 3 approaches the work float 2 to such an extent that a worker can move when the connecting portion 20 is opened.

  Next, as shown in FIG. 14, the assembly intermediate 70 (first stage) of the temporary closing structure 7 is assembled on the float platform FP1 in which the installation is completed. As shown in FIGS. 1, 2, and 14, the worker indicates each of the float divisions 5 by using the workboat, and first, the adjacent float divisions 5 by arrows N1 and N2 and arrows N5 and N6. The work float 2 (therefore, the float platform FP1) is brought into a contracted state by appropriately sliding in the directions indicated by arrows N3 and N4 and sliding in the directions indicated by arrows N7 and N8. In this contracted state, the float platform FP1 can assemble and hold the assembly intermediate 70 (corresponding to the first state in the present invention).

  The worker inserts the liner plate 73 in the circumferential direction of the pier 10 using the bolts 73c and the nuts 73d while interposing the waterproof packing 76 from the inside, as shown in FIGS. 10 (A) to 10 (C). connect. As shown in FIG. 14, this operation is repeated to assemble the liner plates 73 into three layers and set the height to 1.5 m. As shown in FIGS. 12 (A) to 12 (E) and FIG. 14, a reinforcing member 74 is placed on the uppermost part with a water-stop packing 76 interposed therebetween, and the circumferential direction is set using bolts 73c and nuts 73d. Connect to When connecting the reinforcing member 74, the attachment plate 77 is fixed to the seam in the circumferential direction with the addressing bolt 73c and the nut 73d.

  Next, as shown in FIG. 15, 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 slide the work float 2 (and thus the float platform FP1) in an enlarged state. Then, the assembly intermediate 70 (first stage) passes between the positioning spacer 4 and the work float 2, and a gap 21 that can descend into water is generated (corresponding to the second state in the present invention). 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. 16, the operator performs a switch operation of the electric chain block 83 to turn 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 formed between the work float 2 and the positioning spacer 4 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 FIG. 17, 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 anchor bolts, and moves a concrete mixer truck (not shown) stopped on the bridge girder 13 around the bottom in the temporary closing structure 7. The underwater concrete is sent in and the concrete 75 for waterproofing is poured. This prevents water from entering through a gap formed between the pier foundation and the bottom of the temporary closing structure 7. The casting of the water-blocking concrete 75 may be performed after lamination of all the assembly intermediates 70 described later. It is preferable that the concrete 75 for waterproofing is cast as a form by connecting the liner plate 73 to the inside of the temporary closing structure 7 in the circumferential direction.

  Next, as shown in FIG. 18, after assembling the assembly intermediate body 70 (first stage), the worker slides each of the float divided bodies 5 by pushing using the work boat 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 body 70 is performed thereon. Thereafter, the worker once lifts the assembly intermediate body 70 (second stage) in the direction indicated by the arrow 17 to bring the work float 2 into the expanded state again. The diver instructs and guides the worker by using an underwater telephone, and assembles the assembly intermediate 70 (second stage) on the assembly 70 (first stage) via the water-stop packing 76, As shown in FIGS. 12 (A) to 12 (E), a connection operation using bolts 73c and nuts 73d is performed.

  Next, as shown in FIG. 19, similarly, the worker sets the work float 2 in the contracted state, assembles the third-stage assembly intermediate body 70, temporarily lifts the work float 2 in the direction indicated by the arrow N <b> 17, and enlarges the work float 2. In this state, the assembly intermediate 70 (third stage) is lowered onto the assembly intermediate 70 (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 70 (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, a liner plate 73 may be further laminated directly on the upper surface of the assembly intermediate 70 (third stage). The connection and fixation of the assembly intermediates 70 may be performed for each of the assembly intermediates 70 as in this embodiment, or may be performed after all the assembly intermediates 70 have been stacked.

  Next, as shown in FIG. 20, when the installation of the temporary closing structure 7 on the pier foundation 11 is completed, the diver makes a support rod (a cutting beam 71 and a vertical beam 72) inside the temporary closing structure 7. ) Is provided as appropriate.

  Next, as shown in FIG. 21, the worker removes the float platform FP1 from around the pier 10. Thereafter, the worker pulls out the distal end 85a of the hose 85 from the upper portion of the temporary closing structure 7 to drain water from the temporary closing structure 7 with a submersible pump (not shown) for drainage, and performs the operation 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, at least one float divided body 5 has a curved shape corresponding to the assembly intermediate 70. Thereby, the float platform FP1 can be made compact. Such a float platform FP1 can reliably and efficiently assemble the assembly intermediate 70 on the work float 2 in the first state. In the case where the work float 2 is in the second state, by separating the adjacent float divided bodies 5 with a minimum movement, the assembly intermediate 70 can be reliably lowered into the water. Thus, the float platform F1 is suitable for the construction of the temporary closing structure 7.

  Further, in the construction of the temporary closing structure 7, since the assembly of the assembly intermediate body 70 is performed on the float platform FP1, the ratio of the underwater operation by the diver can be reduced while the ratio of the underwater operation by the diver can be increased. 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. Thereby, it is possible to shorten the construction period of the temporary closing structure 7 and thereby reduce the cost.

  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, in a situation where the connecting operation is performed underwater, the diver must perform the operation in an unstable posture. Therefore, when the water stopping packing 76 is assembled, the water stopping seal 76 is likely to be damaged, and the seal is likely to leak. According to the present embodiment, since underwater work can be reduced, it is possible to prevent water leakage due to this.

  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 be converted into a reduced state in which the assembly intermediate body 70 can be assembled and an expanded state in which the assembly intermediate body 70 can be lowered into the water while maintaining integrity by the slide mechanism 6 without requiring disassembly. Can be performed easily and reliably. Therefore, the assembling work of the assembling intermediate body 70 and the descending 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. As a result, the number of working days can be shortened, so that it is possible to shorten the construction period for constructing the temporary closing structure 7 and thereby reduce the cost.

  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 intermediate 70. As a result, it is possible to accurately assemble the intermediate body 70 for assembling the temporary closing structure 7, and it is possible to reduce the occurrence of problems such as leakage of the seal.

  In addition, the float platform FP1 includes a passage float 3. When the float platform FP1 is in the expanded state, the connecting portion 20 between the 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.

  In the present embodiment, the work float 2 can easily and reliably perform the mutual conversion between the reduced state in which the assembly intermediate 70 can be assembled and the expanded state in which the work intermediate 2 can descend into the water by the slide mechanism 6. Therefore, in the construction of the temporary closing structure 7, each time the assembly intermediate 70 is assembled on the work float 2, the assembly intermediate 70 is lowered into the water and can be easily laminated on the pier foundation 11. Since it is not necessary to suspend the laminated body in which the assembly intermediates 70 are laminated, it is not necessary to prepare suspension equipment such as the electric chain block 83 having a high capacity. Therefore, the temporary closing structure 7 can be compactly constructed around the pier 10 without being large. Moreover, thereby, the cost of the equipment for constructing the temporary closing structure 7 can be reduced. Further, the danger of occurrence of an accident can be prevented, and the safety of workers can be improved.

<Second embodiment>
A float platform FP2 according to the second embodiment of the present invention will be described with reference to FIGS. In the float platform FP2, 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. The float platform FP2 according to the present embodiment is different from the float platform FP1 according to the first embodiment, which is an oval annular shape in that it is circular in shape.

  As shown in FIG. 22, the float platform FP2 is installed around a pier 10A having a circular cross section. The float platform FP2 has a circular ring shape in plan view when reduced in accordance with the cross-sectional shape of the pier 10A. The float platform FP2 includes a work float 2A in which four float divided bodies 5A are connected by a slide mechanism 6. The float split body 5A is manufactured by combining two R-shaped float units 50B having an R-shape in plan view according to the site dimensions, and includes only an R-shape portion. The float split body 5A is manufactured by connecting the R-shaped float units 50B to each other with bolts and nuts. The R-shaped part corresponds to an example of the curved part according to the present invention.

  The float split body 5A is slid by the slide mechanism 6, and the work float 2A (and, consequently, the float platform FP2) is reduced, and the assembly intermediate 70A of the temporary closing structure 7 can be assembled and held thereon. Become. That is, the reduced state corresponds to the first state in the present invention.

  As shown in FIG. 23, the adjacent float divided bodies 5A are relatively slid and moved so that the interval between them at the connecting portion 20 is large, and the work float 2A (therefore, the float platform FP2) is brought into an enlarged state. Thus, a gap 21 is formed between the positioning spacer 4 and each of the float divided bodies 5A, and the assembly intermediate 70A can be lowered into water. That is, the enlarged state corresponds to the second state in the present invention.

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

<Third embodiment>
The float platform FP3 according to the third embodiment of the present invention will be described with reference to FIGS. In the float platform FP3, components having the same or similar functions as those of the float platform FP1 or the float platform FP2 according to the first and second embodiments are denoted by the same reference numerals. A detailed description of these will be omitted. The float platform FP3 according to the present embodiment is different from the first and second embodiments in that the float platform FP3 includes a work float 2B, assembles and holds the assembled intermediate body 70A during enlargement, and lowers underwater when reduced. . That is, in the present embodiment, the enlarged state corresponds to the first state according to the present invention, and the contracted state corresponds to the second state according to the present invention.

  As shown in FIG. 24, first, the adjacent float divided bodies 5B are appropriately slid relative to each other in the directions indicated by arrows N9 and N10 and arrows N13 and N14 so that the distance between the connecting portions 20 is large. The inner side 2Ba of the work float 2B is in contact with the outer side 4Ba of the positioning spacer 4B in a state where the work float 2B is expanded by sliding relatively appropriately in directions indicated by arrows N11 and N12 and arrows N15 and N16. In this state, the work float 2B (therefore, the float platform FP3) can assemble and hold the assembly intermediate 70A of the temporary closing structure 7 thereon. When the work float 2B is brought into the enlarged state, the adjacent float divided bodies 5B are first slid relative to each other in the directions indicated by arrows N11 and N12 and arrows N15 and N16, and then the arrows N9, N10 and arrow N13. , N14.

  The positioning spacer 4B is detachably attached to the pier 10A. As shown in FIG. 25, the positioning spacer 4B is removed from the pier 10A, the slide mechanism 6 is contracted, and the float divided bodies 5B are first appropriately moved in the directions indicated by arrows N1, N2 and arrows N5, N6 so as to reduce the interval. When the connecting portion 20 is closed as a result of the relative sliding movement and the subsequent sliding movement in the directions indicated by the arrows N3 and N4 and the arrows N7 and N8, the work float 2B (therefore, the float platform FP3) is in a contracted state. Thus, the assembly intermediate 70A can be lowered into the water. When the work float 2B is brought into the contracted state, each float divided body 5B is first slidably moved in the directions indicated by arrows N3 and N4 and arrows N7 and N8, and then the arrows N1, N2 and arrow N5, It may be performed by appropriately sliding relative to the direction indicated by N6.

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

  In addition, the work float 2B lowers the assembly intermediate 70A into the water in a reduced state. In the contracted state, the work float 2B is in a state of approaching the pier 10A. This makes it easy to fix the work float 2B when lowering the assembly intermediate 70A into the water.

<Fourth embodiment>
A float platform FP4 according to the fourth embodiment of the present invention will be described with reference to FIGS. 26 (A) and 26 (B). In the float platform FP4, components having the same or similar functions as the components of the float platform FP1 according to the first embodiment are denoted by the same reference numerals. A detailed description of these will be omitted. The float platform FP4 according to the present embodiment is different from the first to third embodiments in that the float platform FP4 includes a work float 2C and a slide mechanism 6C. In addition, the slide mechanism 6C is equivalent to an example of the expansion and contraction connection means in the present invention.

  As shown in FIG. 26A, the slide mechanism 6C includes slide pipes 60C on both sides of the adjacent float split body 5. The slide mechanism 6C has a slide bar 61C inserted into the slide pipe 60C, and is integrated so as to be slidable with each other. At the time of assembling the float platform FP4, the slide pipe 60C is fixed to the adjacent float divided body 5 with a bolt 63 using a fixture 62. Thereby, the adjacent float divided bodies 5 can slide with each other. As a result, the work float 2C (and, consequently, the float platform FP4) can assume one of a reduced state and an expanded state.

  The slide mechanism 6C includes a stopper mechanism 65C. The stopper mechanism 65C includes a contact plate 65Ca provided at both ends of the slide bar 61C and an end 65Cb of the slide pipe 60C. The stopper mechanism 65C is for preventing the adjacent float divided bodies 5 from being separated from each other when the float divided body 5 slides in a direction in which the connecting portion 20 opens.

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

  Further, since the slide mechanism 6C has a symmetrical shape, the slide mechanism 6C is arranged on both sides of the adjacent float divided body 5 with good balance. Thereby, the adjacent float divided bodies 5 can slide smoothly with each other.

<Fifth embodiment>
A float platform FP5 according to a fifth embodiment of the present invention will be described with reference to FIGS. 27A and 27B. In the float platform FP5, components having the same or similar functions as the components of the float platform FP1 according to the first embodiment are denoted by the same reference numerals. A detailed description of these will be omitted. The float platform FP5 according to the present embodiment is different from the first to fourth embodiments in that the float platform FP5 includes a work float 2D and a slide mechanism 6D. In addition, the slide mechanism 6D is equivalent to an example of the expansion / contraction connection means in the present invention.

  As shown in FIG. 27A, two adjacent float split bodies 5 are connected by a slide mechanism 6D. The slide mechanism 6D includes a feed screw 66 and two guide shafts 61D. A motor 67 coupled to a feed screw 66 and a pair of guide shaft fixing members 64D are attached to one float divided body 5. A nut 68 is fixed to the other float divided body 5. A female screw portion is formed on the inner peripheral surface of the nut 68, and is screwed with a male screw portion of the feed screw 66. Thereby, the adjacent float division bodies 5 are connected.

  A pair of guide portions 60D having a circular guide hole formed therethrough is attached to the other float split body 5, and a guide shaft 61D is inserted into the guide hole so as to be relatively movable. Thereby, by operating the motor 67, the adjacent float divided bodies 5 relatively slide while being guided by the guide shaft 61D.

  As shown in FIG. 27 (A), when the adjacent float divided bodies 5 slide in such a manner that their intervals become smaller in the directions indicated by arrows N1 and N2 and move closer to each other, the connecting portion 20 closes. As shown in FIG. 27 (B), when the float divided body 5 is slid and moved away from each other with an increased interval in the directions indicated by arrows N9 and N10, the connecting portion 20 is opened. As a result, the work float 2D (and, consequently, the float platform FP5) can assume one of a reduced state and an expanded state.

  The slide mechanism 6D includes a stopper mechanism 65D. The stopper mechanism 65D includes a contact plate 65Da provided at the tip of the guide shaft 61D and an end 65Db of the guide 60D. The stopper mechanism 65D is for preventing the adjacent float divided bodies 5 from being separated from each other when the float divided body 5 slides in a direction in which the connecting portion 20 opens.

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

  In addition, the work float 2D (and, by extension, the float platform FP5) can be brought into one of a reduced state and an expanded state without applying external force. Thereby, labor saving can be achieved in the construction of the temporary closing structure 7.

<Sixth embodiment>
With reference to FIGS. 28A and 28B, a float platform FP6 according to a sixth embodiment of the present invention will be described. In the float platform FP6, 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. The float platform FP6 according to the present embodiment is different from the first to fifth embodiments in that a work float 2E is provided and a connecting arm 6E is provided in the connecting portion 20. The connecting arm is for sliding the float divided body 5 each time following the same path, similarly to the slide mechanism 6 described in the first embodiment. It is equivalent.

  As shown in FIG. 28 (A), two adjacent float split bodies 5 are connected by a pair of connecting arms 6E. The connecting arm 6E has a joint 69, and is attached to the float split body 5 by an attachment 62E. When the float divided body 5 moves in the directions indicated by the arrows N1 and N2 so that the interval between them becomes smaller, the connecting arm 6E is bent at the joint 69, and the connecting portion 20 is closed. As shown in FIG. 28 (B), when the float split body 5 relatively slides in the directions indicated by arrows N9 and N10 so as to increase the interval therebetween, the connecting arm 6E extends at the joint 69, and the connecting portion 6E is extended. 20 opens. As a result, the work float 2E (and, consequently, the float platform FP6) can assume one of a reduced state and an expanded state.

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

<Seventh embodiment>
The float platforms FP7 and FP8 according to the seventh embodiment of the present invention will be described with reference to FIGS. In the float platforms FP7 and FP8, components having the same or similar functions as the components 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. 29, the float platform FP7 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 a float split body 5C. This is different from the first embodiment to the sixth embodiment. The assembly intermediate 70B differs from the assembly intermediates 70 and 70A in the shape presented in plan view.

  As shown in FIGS. 29 and 30, the work float 2F is manufactured by connecting four float divided bodies 5C. The float split body 5C 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 curved portion 56A is manufactured by combining two rectangular float units 50 having a rectangular parallelepiped shape and two curved shape generating spacers 50C having a triangular prism shape. The rectangular float unit 50 has a square shape in plan view. The curved shape generating spacer 50C has a triangular shape in plan view. One corner 57a of the curved shape generation spacer 50C is arranged inside the work float 2F, 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 50C 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 triangular shape provided by the curved shape generating spacer 50C corresponds to an example of a polygonal shape according to the present invention.

  The number of the curved shape generating spacers 50C used to manufacture the float split body 5C is not limited to two, but may be one, three, five, six, seven, depending on the outer shape of the pier 10A. Eight, nine, or more. It is also possible to connect a plurality of curved shape generating spacers 50C adjacent to each other. The curved shape generating spacer 50C is connected to the adjacent rectangular float unit 50 or the curved shape generating spacer 50C using, for example, bolts and nuts.

  As shown in FIG. 31, the curved shape generating spacer 50 </ b> C 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 50C flat, thereby facilitating the operation on the float platform FP7. 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, sliding plates 59e, and spacers 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 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 a blade 59i of a hinge 59c and a bolt 59g / nut 59h with a spacer 59f interposed. In this way, grooves are formed at the upper and lower ends to form a sliding portion 59l. By inserting the rail portions 59k of the upper and lower frame members 59b into the sliding portions 59l, the sliding portions 59l can slide on the rail portions 59k in 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. 32A, 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. 32B, when the sliding portion 59l is slid in the direction shown by the arrow N20, the angle of the corner 57a becomes smaller than 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. 31, 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 generating spacer 50C 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 accommodates, for example, the slide mechanisms 6, 6C, 6D, 6E described in the first to sixth embodiments.

  Next, referring to FIG. 33, a float platform FP8 using the curved shape generating spacer 50C shown in FIG. 32B will be described. The pier 10B is larger than the pier 10A. The float platform FP8 is adapted to the pier 10B and is configured to be capable of assembling the assembly intermediate 70C, and includes a work float 2G including a float split body 5D. 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. 33, the float split body 5D 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 50C. As described above, the curved shape generating spacer 50C has a smaller angle of the corner 57a and a larger angle of the corners 57b and 57c than the float platform FP8, 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 50C 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 5C and 5D of the float platforms FP7 and FP8 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 50C. can do. Therefore, the burden of preparing the float platforms FP7 and FP8 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 50C 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 50C and the rectangular float unit 50, which are common members, can be used to construct the float platforms FP7, FP8 adapted to the piers 10A, 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.

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

  As shown in FIG. 34, the curved shape generating spacer 50D 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 2F and 2G in the seventh embodiment, and the shorter base is the side corresponding to the inside of the work floats 2F and 2G. Are located in The curved shape generating spacer 50D includes a wooden scaffold plate 58A as a working plate and a frame portion 59A. The square shape provided by the curved shape generation spacer 50D corresponds to an example of a polygonal shape according to the present invention.

  The wooden scaffolding plate 58A is for making the upper surface of the curved shape generating spacer 50D flat, thereby 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 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 50D 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 2F and 2G in the seventh 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 2F and 2G. 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. In the seventh embodiment, by changing the number of connections of the rectangular float unit 50 and the curved shape generating spacer 50D, the angles of the quadrangular corners 57a, 57b, 57c, 57d and the length of the one side, The portion 56A is changed to a curved shape portion 56B having a different degree of curvature. The degree of curvature of the curved portions 56A and 56B can be adjusted.

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

  The present invention is not limited to the contents of the above-described embodiment. The construction method of the temporary closing structure according to the present invention and the specific configuration of the float platform used for the method 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 first to eighth embodiments described above, the construction of the temporary deadline structure when repairing a pier in a river 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. In addition, 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 other than 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 of the intermediate assembly can be arbitrarily set to one, two, three, four, five, or the like. The number of liner plates used in the circumferential direction can also be set arbitrarily.

  The shape in plan view of the curved shape generating spacer described in the seventh and eighth 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.

  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, FP4, FP5, FP6, FP7, FP8 Float platform 10, 10A, 10B Pier (underwater structure)
2, 2A, 2B, 2C, 2D, 2E, 2F, 2G Work float 20 Connecting part 3 Passage float 4, 4B Positioning spacer 5, 5A, 5B, 5C, 5D Float split body 50 Rectangular float unit 50C, 50D Curved shape generation Spacer 56, 56A, 56B Curved shape part 6, 6C, 6D Slide mechanism (expansion connection means)
6E connecting arm (expandable connecting means)
7 Temporary deadline structure 70, 70A, 70B, 70C Assembly intermediate

Claims (10)

A float platform that is used to construct a temporary shutoff structure that includes an assembly intermediate that is assembled around an underwater structure and that has an at least partially curved shape, and that is built around the underwater structure,
A work float floatable on the water and formed to surround the underwater structure and used thereon to assemble the assembly intermediate;
The work float can be reversibly changeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and holds the assembly intermediate. Configured to take a possible first state and a second state capable of passing through the assembly intermediate and descending into the water, arranged adjacent to each other around the underwater structure Including at least two float splits, wherein the at least two float splits are separated from each other to produce the reduced state and the expanded state;
At least one float divided body of said at least two float split body possess the assembly intermediate curved portion formed to fit the shape of the said first state,
The curved portion includes a curved shape generating spacer that causes the curved portion to have a curved shape,
The float platform , wherein the curved shape portion further includes a rectangular float unit which has a rectangular shape in plan view and imparts buoyancy to the work float, and is formed by combining the curved shape generation spacer and the rectangular float unit . The float platform according to claim 1 , wherein the curved shape generating spacer has a polygonal shape having at least three corners and at least three sides connecting each of the at least three corners in plan view. Each corner is configured to be able to change the angle,
At least two corners of the at least three corners are arranged outside the work float, and at least one corner is arranged inside the work float,
The side connecting the at least two corners disposed on the outside of the work float is configured to be variable in length,
3. The curved portion according to claim 2 , wherein the angle of the corner portion and the length of the side connecting the at least two corner portions are changed to adjust a degree of curvature of the curved portion. 4. Float platform. The polygonal shape is triangular, the float platform according to claim 2 or 3. The float platform according to claim 4 , wherein the triangular shape is an isosceles triangle whose base is the side connecting the corners arranged on the outside of the work float. A float platform that is used to construct a temporary shutoff structure that includes an assembly intermediate that is assembled around an underwater structure and that has an at least partially curved shape, and that is built around the underwater structure,
A work float floatable on the water and formed to surround the underwater structure and used thereon to assemble the assembly intermediate;
The work float can be reversibly changeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and holds the assembly intermediate. Configured to take a possible first state and a second state capable of passing through the assembly intermediate and descending into the water, arranged adjacent to each other around the underwater structure Including at least two float splits, wherein the at least two float splits are separated from each other to produce the reduced state and the expanded state;
At least one float divided body of said at least two float split body possess the assembly intermediate curved portion formed to fit the shape of the said first state,
The work float is configured to connect adjacent float divisions of the at least two float divisions and expand and contract the expansion and contraction connection means, and a connecting portion formed between the adjacent float divisions by the expansion and contraction connection means. And
A float platform that expands and contracts at the connecting portion, and causes the adjacent float divided bodies to move away from each other by relatively sliding to generate the contracted state and the enlarged state . The float according to claim 6 , further comprising: a passage float disposed outside the connection portion of the work float and abutting on the adjacent float divided body so as to be a detour when the connection portion is opened. platform. A float platform that is used to construct a temporary shutoff structure that includes an assembly intermediate that is assembled around an underwater structure and that has an at least partially curved shape, and that is built around the underwater structure,
A work float floatable on the water and formed to surround the underwater structure and used thereon to assemble the assembly intermediate;
The work float can be reversibly changeable between a contracted state and an expanded state around the underwater structure, based on which the assembly intermediate can be assembled and holds the assembly intermediate. Configured to take a possible first state and a second state capable of passing through the assembly intermediate and descending into the water, arranged adjacent to each other around the underwater structure Including at least two float splits, wherein the at least two float splits are separated from each other to produce the reduced state and the expanded state;
At least one float divided body of said at least two float split body possess the assembly intermediates curved portion formed to fit the shape of the said first state,
A positioning spacer disposed between the work float and the underwater structure, attached to the underwater structure, abutting on the inside of the work float in the first state, and positioning the work float; Equipped with a float platform. 9. The work float allows the assembly intermediate to be laminated on a foundation of the underwater structure by repeatedly interchanging the first state and the second state. 10. The float platform according to any of the above. It is a construction method of the temporary closing structure using the float platform according to any one of claims 1 to 9 ,
An assembling step of setting the work float to the first state and assembling the assembly intermediate;
A step of temporarily lifting the assembly intermediate from the work float to a predetermined height, setting the float platform in the second state, and lowering the assembly intermediate in water;
An installation step of installing the assembled intermediate dropped in water on a foundation of the underwater structure;
A method for constructing a temporary deadline structure having:

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