JP2013224578A - Reinforcing method of underwater structure and temporary coffering structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce an underwater structure at low cost and within a short construction term even in the great depth of water.SOLUTION: In a first step, a wall body 10 for a mold frame is installed around an underwater structure. In a second step, a gap between the wall body 10 for a mold frame installed in the first step and the underwater structure is filled with filling. In a third step, a temporary coffering wall body 40 is installed around the underwater structure higher than the wall body 10 for a mold frame. In a fourth step, water between the temporary coffering wall body 40 installed in the third step and the underwater structure is drained, thereby forming a space for performing underwater structure reinforcing work therein.

Description

  The present invention relates to a technique for reinforcing an underwater structure.

  As an example of a technique for reinforcing an underwater structure such as a bridge pier, a method of enclosing the underwater structure with a reinforcing bar and a mold and placing underwater concrete between the underwater structure and the mold (for example, Patent Document 1).

JP 2007-177492 A

In the above construction method, concrete is placed underwater, but in cases where emphasis is placed on the quality of reinforcement, construction in a so-called dry environment is advantageous. As a method of reinforcement by dry construction, a temporary deadline is constructed by surrounding the structure with a wall body, and water between the wall body and the structure is drained to form a dry environment space. There is a known construction method in which steel is reinforced with reinforced concrete. However, when constructing a temporary deadline, as the water depth increases, the wall body becomes larger in order to withstand water pressure, and the difficulty of water stoppage increases, resulting in increased costs and construction time. .
Therefore, an object of the present invention is to reinforce an underwater structure at a low cost and in a short construction period even at a great depth.

  The present invention includes a first step of installing a formwork wall body around an underwater structure, and a filling material is filled between the formwork wall body and the underwater structure installed in the first step. A second step, a third step of installing a temporary cutoff wall around the underwater structure above the formwork wall, and the temporary cutoff wall set in the third step; There is provided a method for reinforcing an underwater structure, comprising: a fourth step of forming a space for performing a reinforcing operation of the underwater structure by performing drainage with the underwater structure.

  In the above configuration, the formwork wall before being installed around the underwater structure is provided with a reinforcing material stretched in advance so as to be buried in the filling when the filling is filled. It may be done.

  In the above configuration, the formwork wall body or the temporary cutoff wall body may have a hollow internal space and be transportable in a floating state on the water surface.

  In the above configuration, the formwork wall body or the temporary closing wall body has a buoyancy that acts on the formwork wall body and the temporary closing wall body by changing a ratio of gas and liquid in the internal space. May be adjustable.

  The said structure WHEREIN: After finishing the said reinforcement work, you may leave without removing the said wall for formwork.

  Further, the present invention provides a formwork wall body that is installed around an underwater structure and is filled with a filler between the underwater structure, and the underwater structure that is above the formwork wall body. A temporary closing structure having a temporary closing wall that is installed around an object and has a space for performing a reinforcement operation of the underwater structure by draining water between the underwater structure and the water I will provide a.

  According to the present invention, the underwater structure can be reinforced at a low cost and in a short construction period even at a large depth.

The side view of 10A of 1st wall bodies and the 2nd wall body 10B. Sectional drawing in the II line | wire of FIG. FIG. 3 is an end view taken along line II-II in FIG. 2. Sectional drawing of the state which closed the 1st wall body 10A and the 2nd wall body 10B. The figure which shows the connection part of the wall 10 for formwork, and the reinforcing bar 17. The side view of 3rd wall 40A and 4th wall 40B. Sectional drawing in the III-III line of FIG. The end view in the IV-IV line of FIG. Sectional drawing of the state which closed the 3rd wall 40A and the 4th wall 40B. The flowchart which shows the process of reinforcement construction. The figure which shows the operation | work content and completed form of step S01. The figure which shows the operation | work content and completed form of step S02. The figure which shows the operation | work content and result of step S03. The figure which shows the operation | work content and completed form of step S04. The figure which shows the operation | work content and completed form of step S05. The figure which shows the operation | work content and completed form of step S06. The figure which shows the operation | work content and completed form of step S07. The figure which shows the work content and completed form of step S08. The figure which shows the operation | work content and completed form of step S09. The figure which shows the operation | work content and completed form of step S10. The figure which shows the operation | work content and completed form of step S11. The figure which shows the work content of step S12, and a completed form. The figure which shows the work content and result of step S13. The figure which shows the content of work of step S14, and a completed form. The top view of the wall 10 for formwork. The top view of the cradle 60. FIG. The top view of the state which installed the wall 40 for temporary deadlines in the cradle 60. FIG. The figure which shows the example which does not install the cradle 60. FIG.

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. In this embodiment, a wall for a formwork for forming a concrete formwork and a wall for a temporary cut-off for realizing a dry environment are used in combination. The frame wall will be described. FIG. 1 is a side view of the first wall body 10A and the second wall body 10B. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is an end view taken along line II-II in FIG. In the following description, the vertical direction in FIG. 1 is the z direction, the horizontal direction in FIG. 1 is the x direction, and the vertical direction in FIG. 2 is the y direction.

  The first wall body 10A and the second wall body 10B are formwork wall bodies used as a formwork for winding concrete around an underwater structure to be reinforced (hereinafter referred to as the reinforced object 1). is there. Since the first wall body 10A and the second wall body 10B have the same basic configuration, the first wall body 10A and the second wall body 10B are collectively referred to as a formwork wall body 10 when they are not distinguished from each other. The formwork wall 10 is a steel structure having a substantially cylindrical shape divided into two equal parts in the axial direction, and has a hollow structure. The outer wall 20 of the formwork wall body 10 is provided with a valve 14 for injecting or discharging water or air into an internal space having a hollow structure (hereinafter referred to as a hollow space 13). When the hollow space 13 is filled with air and the valve 14 is closed, the airtightness of the hollow space 13 is maintained, and the formwork wall 10 becomes a floating body floatable in water. Moreover, it is possible to adjust the buoyancy acting on the formwork wall 10 by changing the ratio of water and air in the hollow space 13. Further, the outer wall 20 of the formwork wall body 10 is provided with a hanging metal fitting 15 for suspending the formwork wall body 10 with a crane.

FIG. 4 is a cross-sectional view taken along line II in a state where the first wall body 10A and the second wall body 10B are closed. In addition, although the reinforcement target object 1 is shown with the dashed-two dotted line in FIG. 4, the column-shaped bridge pier etc. which make az direction an axial direction are assumed as the reinforcement target object 1 here. As shown in the figure, when the first wall 10A and the second wall 10B are closed with the inner wall 16 facing the object 1 to be reinforced, underwater concrete or the like is placed between the inner wall 16 and the object 1 to be reinforced. A space to be filled with the filling (hereinafter referred to as filling space 2) is formed. The cross-sectional shape of the inner wall 16 is determined according to the shape of the reinforcing object 1. In this example, since the object 1 to be reinforced is cylindrical, the cross section of the inner wall 16 is semicircular as shown in FIG. Further, the dimension of the inner wall 16 is determined so that a distance equal to the concrete thickness determined by the design is ensured between the inner wall 16 and the object 1 to be reinforced.

  FIG. 5 is a view showing a connection portion between the formwork wall 10 and the reinforcing bar 17. A reinforcing bar 17 designed according to the reinforcement object 1 is attached to the inner wall 16. This reinforcing bar 17 is stretched around a position where it is buried in concrete when the filling space 2 is filled with concrete. The reinforcing bar 17 is provided with a reinforcing bar fixing bracket 18 extending from the reinforcing bar 17 toward the inner wall 16, and a screw hole is formed at the distal end portion of the reinforcing bar fixing bracket 18 on the mold wall 10 side. A hole 19 through which the bolt 22 passes is provided at a position corresponding to the distal end portion of the reinforcing bar fixing metal 18 on the inner wall 16. At a position corresponding to the hole 19, a box-like bolt attaching / detaching space 21 reaching from the outer wall 20 side to the surface of the inner wall 16 not facing the reinforcing object 1 is provided. The reinforcing bar 17 is fixed to the inner wall 16 by attaching the bolt 22 to the screw hole at the tip of the reinforcing bar fixing bracket 18 via the screw. When removing the formwork wall 10 after placing the concrete, an operator inserts his hand into the bolt attaching / detaching space 21 and removes the bolt 22 from the reinforcing bar fixing bracket 18.

  As shown in FIGS. 2, 3, and 4, the inner wall 16 is provided with a spacer 23 that protrudes toward the reinforcing object 1. The distal end portion of the spacer 23 protrudes at least toward the reinforcement object 1 side with respect to the reinforcing bar 17, and prevents the reinforcing bar 17 from colliding with the reinforcement object 1. It is desirable that the distal end portion of the spacer 23 is made of a material and a shape that can reduce damage to the reinforcing object 1 even if the distal end part itself collides with the reinforcing object 1.

  As shown in FIGS. 1, 2, and 4, in the outer wall 20 of the first wall body 10A, a first guide 24 is provided at an edge portion joined to the outer wall 20 of the second wall body 10B. In the outer wall 20 of the second wall body 10B, a second guide 25 having a shape corresponding to the first guide 24 is provided at an edge portion joined to the outer wall 20 of the first wall body 10A. When the first wall body 10A and the second wall body 10B are closed, the first wall body 10A and the second wall body 10B are positioned relative to each other by fitting the first guide 24 into the second guide 25. The

  Next, the temporary cutoff wall will be described. FIG. 6 is a side view of the third wall body 40A and the fourth wall body 40B. 7 is a cross-sectional view taken along line III-III in FIG. FIG. 8 is an end view taken along line IV-IV in FIG. The third wall body 40 </ b> A and the fourth wall body 40 </ b> B are temporary cutoff wall bodies used as temporary cutoff around the reinforcing object 1. Since the third wall body 40A and the fourth wall body 40B have the same basic configuration, they are collectively referred to as a temporary closing wall body 40 when they are not distinguished from each other. The temporary cutoff wall 40 is a steel structure having a shape in which a cylinder having a substantially rectangular cross section is equally divided into two in the axial direction, and has a hollow structure. The outer wall 48 of the temporary closing wall 40 is provided with a valve 44 for injecting or discharging water or air into an internal space having a hollow structure (hereinafter referred to as a hollow space 43). When the hollow space 43 is filled with air and the valve is closed, the airtightness of the hollow space 43 is maintained, and the temporary closing wall 40 becomes a floating body that can be towed in water. In addition, the buoyancy acting on the temporary closing wall 40 can be adjusted by changing the ratio of water and air in the hollow space 43. In addition, the outer wall 48 of the temporary closing wall 40 is provided with a hanging metal fitting 45 for hanging the temporary closing wall 40 with a crane.

FIG. 9 is a cross-sectional view taken along line IV-IV in a state where the third wall body 40A and the fourth wall body 40B are closed. As shown in the figure, when the third wall body 40 </ b> A and the fourth wall body 40 </ b> B are closed with the inner wall 46 facing the reinforcement object 1, the worker reinforces between the inner wall 46 and the reinforcement object 1. A space (hereinafter referred to as work space 3) for performing the reinforcement work of the object 1 is formed. The inner wall 46 is provided with ribs 47 for installing a cutting beam between the reinforcing object 1 and the inner wall 46.

  As shown in FIGS. 6, 7, and 9, in the outer wall 48 of the third wall body 40 </ b> A, a first guide 49 is provided at an edge portion joined to the outer wall 48 of the fourth wall body 40 </ b> B. In the outer wall 48 of the fourth wall body 40B, a second guide 50 having a shape corresponding to the first guide 49 is provided at an edge portion joined to the outer wall 48 of the third wall body 40A. When closing the third wall body 40A and the fourth wall body 40B, the third wall body 40A and the fourth wall body 40B are positioned relative to each other by fitting the first guide 49 into the second guide 50. The

  The underwater structure is reinforced by placing underwater concrete using a formwork wall for the deep water, and the underwater structure is dry by a temporary cutoff wall for the underwater structure. Reinforcing work is performed by workers after realizing the environment. For this reason, the temporary closing wall is placed on the formwork wall, and at this time, the configuration for placing the temporary closing wall is called a cradle.

  FIG. 25 is a plan view of the formwork wall 10. The figure shows a state in which reinforced concrete 26 is filled in 2 in a filling space formed by installing the formwork wall 10. FIG. 26 is a plan view of the cradle 60. FIG. 27 is a plan view of a state in which the temporary cutoff wall 40 is installed on the cradle 60. As shown in FIG. 26, the cradle 60 is divided into two parts, that is, the first wall body 10A side and the second wall body 10B side, and is more reinforced than the inner walls 16 of the first wall body 10A and the second wall body 10B. A portion on the object 1 side is cut out. The upper surface of the cradle 60 is a mounting surface on which the closed temporary closing wall 40 is placed. The closed temporary closing wall 40 is sunk in the cradle 60 via a water stop mechanism 51 such as sponge rubber, and a cutting beam 52 is installed between the inner wall 46 and the object 1 to be reinforced. Then, after draining the inside of the temporary deadline wall 40 to form the work space 3 in the dry environment, the worker performs the reinforcement work of the reinforcement object 1 in the work space 3.

  Next, the reinforcement work process using the above-described components will be described. FIG. 10 is a flowchart showing the steps of reinforcement work. FIG. 11 to FIG. 24 are diagrams showing the work contents and completed results of each step.

<Step S01 (FIG. 11): Formwork wall and rebar assembly>
The formwork wall 10 is divided into a plurality of units and manufactured at a factory. The manufactured unit is transported to a local work place by, for example, a freight vehicle. The local work place is provided in a land portion such as a seawall near the reinforcement work site, and an assembly base 70, a work scaffold 71, and the like are installed in advance. The worker connects the units on the assembly base 70 to assemble the formwork wall 10, and arranges the reinforcing bars 17 on the inner wall 16 of the assembled formwork wall 10. In step S01, a state where the first wall body 10A and the second wall body 10B are not closed is a completed shape.

<Step S02 (FIG. 12): Formwork Wall Launch>
On the surface of the water, two armored boats 74 carrying the crawler crane 73, two tug boats 75, and a diving vessel 77 carrying a diving man 76 are put on standby. The worker closes the valve 14 of the formwork wall 10, lifts the formwork wall 10 with the wheel crane 78 with the inner wall 16 side facing upward, moves the raised formwork wall 10 onto the water, Launch. Here, the formwork wall 10 with the valve 14 closed is kept airtight in a state where the hollow space 13 is filled with air. It will be in a floating state.

<Step S03 (FIG. 13): Formwork Wall Towing>
Two tug boats 75 tow the first wall body 10A and the second wall body 10B to the position of the reinforcement object 1, respectively. In addition, the two outboard carriages 74 carrying the worker and the crawler crane 73 move to the position of the reinforcement object 1 together with the formwork wall 10 to be towed.

<Step S04 (FIG. 14): Forming wall for formwork>
The tug boat 75 moves the first wall body 10A and the second wall body 10B to a position where the first wall body 10A and the second wall body 10B face each other with the object 1 to be reinforced interposed therebetween. At this time, each bottom part (side in which the hanging metal fitting is not provided) of the first wall body 10A and the second wall body 10B is disposed toward the reinforcement object 1 side. Subsequently, the worker leaves the tugboat 75 and equips the first wall body 10A with the position facing the reinforcement object 1 and the second wall body 10B with the second wall body 10B facing the reinforcement object 1. The trolley 74 is moved.

<Step S05 (FIG. 15): Erecting a wall for formwork>
A diver 76 dives from the diver ship 77 and opens the valve 14 at the bottom of the formwork wall 10 to inject water into the hollow space 13 of the formwork wall 10. The water injection may be performed in parallel between the first wall body 10A and the second wall body 10B, or the water injection of the other wall may be started after the construction of one of the walls is completed. When water injection is started, the bottom of the formwork wall 10 starts to descend. The operator operates the crawler crane 73 to erect the formwork wall 10 so that the inner wall 16 of the formwork wall 10 faces the object 1 to be reinforced. As the water pouring proceeds, the formwork wall 10 gradually descends into the water, but if the height of the portion exposed above the water surface of the formwork wall 10 reaches a predetermined height. In this case, the diver 76 closes the valve 14 and stops water injection once.

<Step S06 (FIG. 16): Formwork wall closing>
The diver 76 fits the first guide 24 of the first wall 10A into the second guide 25 of the second wall 10B, and closes the first wall 10A and the second wall 10B by bolting or the like.

<Step S07 (FIG. 17): Forming a Formwork Wall>
The diver 76 hangs the hook of the crawler crane 73 on the hanging metal fitting 15 of the closed mold wall 10 via a wire or the like, and opens the valve 14 at the bottom. Then, water injection into the hollow space 13 is resumed, and the closed mold wall 10 starts to descend. The worker sets the closed formwork wall 10 while adjusting the descending speed with the crawler crane 73.

<Step S08 (FIG. 18): Installation of cradle>
The diver 76 installs the cradle 60 suspended by the crawler crane 73 on the top of the closed formwork wall 10.

<Step S09 (FIG. 19): Placing underwater concrete>
An operator fills the reinforced concrete 26 (underwater concrete) between the closed formwork wall 10 and the object 1 to be reinforced using a tremmy pipe or the like from the armored carrier.

<Step S10 (FIG. 20): Completion of underwater concrete placement>
When the reinforced concrete 26 reaches the same height as the upper surface of the cradle 60, the worker stops filling the reinforced concrete 26.

<Step S11 (FIG. 21): Temporary Deadline Wall Closure>
The third wall body 40A and the fourth wall body 40B are closed by the same procedure as in steps S01 to S06.

<Step S12 (FIG. 22): Preliminary Deadline Wall Sedimentation>
The closed temporary closing wall 40 is laid down by the same procedure as in step S07, and the bottom of the temporary closing wall 40 is grounded to the upper surface of the cradle 60 via the water stop mechanism 51.

<Step S13 (FIG. 23): Cutting beam installation, work space drainage>
The diver 76 installs the cut beam 52 in the water between the closed temporary closing wall 40 and the object 1 to be reinforced. If the cut beam 52 is installed, the worker drains the work space 3.

<Step S14 (FIG. 24): reinforcement work>
An operator performs the reinforcement work of the reinforcement object 1 inside the work space 3. Reinforcing work includes, for example, bar arrangement, formwork installation, and reinforced concrete placement.

<Step S15 (not shown): Temporary deadline wall removal, formwork wall removal>
When the curing of the reinforced concrete in the work space 3 is completed, the worker removes the formwork and the beam 52. Then, the temporary closing wall 40, the cradle 60, and the formwork wall 10 are sequentially removed. The temporary closing wall 40 is injected with air into the hollow space 43 and lifted by the crawler crane 73 on the outfitting table ship 74. The formwork wall 10 is inserted into the hollow space 13 by a diver inserting a hand from the bolt attaching / detaching space 21 and removing the bolt 22 from the rebar fixing bracket 18, and is lifted by the crawler crane 73. .
The above is the reinforcement work process.

  In the conventional temporary closing method, there is a problem that the wall for temporary closing becomes larger in order to withstand water pressure as the water depth increases. On the other hand, in the present embodiment, concrete is placed between the object to be reinforced and the formwork wall in the deep water portion, and water is poured into the hollow space of the formwork wall. The structure of the formwork wall need not take into account the water pressure at a great depth. On the other hand, since the working space in a dry environment is formed between the object to be reinforced and the wall for temporary closing at a shallow depth, for example, deterioration of the object to be reinforced is compared with reinforcement in which concrete is placed underwater. The quality of the reinforcement can be improved by performing reinforcement while checking the state.

  It should be noted that the water depth corresponding to the boundary between the water depth region using the formwork wall and the water depth region using the temporary closing wall depends on various conditions such as the cost and construction period of the reinforcement work, or the required quality of reinforcement. You may decide in consideration comprehensively. For example, if these boundaries are set at a deeper water depth, the level of the water stop function required for the temporary closing wall increases, so that the manufacturing cost of the temporary closing wall increases and the reinforcement in a dry environment is also required. Although the time required for the work may increase and the construction period may become longer, it can be expected to improve the quality of the reinforcement. On the other hand, if these boundaries are set to shallower water depths, it can be expected that the cost and construction period will be reduced, but the quality of reinforcement may be lowered.

In addition, in the conventional temporary closing method, since the gap between the footing surface and the deposits remaining on the footing surface is formed between the footing and the bottom of the wall, the higher the water pressure, There was a problem that it was difficult to ensure the water-stopping property. On the other hand, in this embodiment, since the filling space formed by installing the formwork wall is filled with underwater concrete, leakage of concrete can be prevented only by taking a simple concrete leakage prevention measure. At the same time, waterproofing is also ensured. On the other hand, since the wall for temporary closing is placed on a cradle that has a flat upper surface and is cleaned, there is no possibility that the water stoppage will deteriorate due to unevenness of the cradle itself or adhering matter. Water stoppage can be secured just by taking measures against water stoppage. .
Therefore, according to this embodiment, the reinforcement work of the underwater structure can be performed at a low cost and in a short construction period at any depth.

(Modification)
The above embodiment may be modified as follows. A plurality of modified examples may be combined.
(Modification 1)
In the embodiment, an example in which the first wall body and the second wall body are closed has been described, but three or more formwork wall bodies may be closed. The same applies to the temporary cutoff wall.
(Modification 2)
In the embodiment, an example of a two-layer structure in which the temporary cutoff wall body is placed on the upper part of the formwork wall body is shown, but a three-layer structure or more may be used according to the water depth. For example, the formwork wall may have a two-layer structure of a lower layer and an upper layer, and the temporary closing wall may be placed on the upper part of the upper formwork wall.
(Modification 3)
In the embodiment, the underwater concrete is shown as an example of the filling material in the filling space, but mortar concrete, synthetic resin, or the like may be used instead of the underwater concrete. In the embodiment, a reinforcing bar is shown as an example of a reinforcing material that reinforces the filler. However, a fiber type reinforcing material such as glass fiber or steel fiber may be used instead of the reinforcing bar.
In the embodiment, an example is shown in which the formwork wall and the temporary cutoff wall are made of steel, but the material of these walls may be synthetic resin or the like.
(Modification 4)
In the embodiment, an example in which the distal end portion of the spacer 23 protrudes at least toward the reinforcing object 1 side from the reinforcing bar 17 is shown, but the spacer 23 may have a length corresponding to the winding thickness of the reinforced concrete.

(Modification 5)
In the embodiment, an example in which a cradle is installed on the top of the formwork wall after the closed formwork wall has been laid down is shown. You may make it do. In addition, as shown in FIG. 28, after placing reinforced concrete (underwater concrete) in the filling space between the formwork wall and the object to be reinforced, the upper end of the reinforced concrete is installed without installing a cradle. A temporary cutoff wall may be installed on the wall.
(Modification 6)
In the embodiment, the example in which the temporary closing wall is installed after placing the underwater concrete in the filling space is shown, but the temporary closing wall may be installed before the underwater concrete is placed.
(Modification 7)
In the embodiment, the example in which the formwork wall is removed last is shown, but the formwork wall may be left outside the reinforced concrete without being removed. In this way, since the formwork wall functions as a part of the reinforcing structure, the thickness of the reinforced concrete can be reduced, the number of reinforcing bars can be reduced, or the reinforcing bars can be omitted.
On the other hand, when removing the formwork wall body, the removed formwork wall body can be diverted to reinforcement of another reinforcement object.
(Modification 8)
In the embodiment, an example in which the first wall body and the second wall body towed separately are closed, but one of the joint portions of the first wall body and the second wall body is connected in advance with a hinge. Also good. In this case, you may make it tow with the attitude | position which constructed the connected 1st wall body and 2nd wall body.

DESCRIPTION OF SYMBOLS 1 Reinforcement object, 2 Filling space, 3 Working space, 4 Footing, 10 Formwork wall body, 10A 1st wall body, 10B 2nd wall body, 13 Hollow space, 14 Valve, 15 Hanging metal fitting, 16 Inner wall, 17 Reinforcing bar, 18 Reinforcing bar fixing bracket, 19 Bolt hole, 20 Outer wall, 21 Bolt mounting / demounting space, 22 Bolt, 23 Spacer, 24 First guide, 25 Second guide, 26 Reinforced concrete, 40 Wall for temporary fastening, 40A 3rd Wall body, 40B Fourth wall body, 43 Hollow space, 44 Valve, 45 Suspension fitting, 46 Inner wall, 47 Rib, 48 Outer wall, 49 First guide, 50 Second guide, 51 Water stop mechanism, 52 Cut beam, 60 Cradle, 70 assembly base, 71 work scaffolding

Claims (6)

A first step of installing a formwork wall around an underwater structure;
A second step of filling a filling material between the formwork wall and the underwater structure installed in the first step;
A third step of installing a temporary cutoff wall around the underwater structure above the formwork wall;
A fourth step of forming a space for reinforcing the underwater structure by performing drainage between the temporary closing wall and the underwater structure installed in the third step. How to reinforce a structure.   The mold wall before being installed around the underwater structure is preliminarily provided with a reinforcing material stretched in a position to be buried in the filling when the filling is filled. Item 2. A method for reinforcing an underwater structure according to Item 1.   3. The method for reinforcing an underwater structure according to claim 1, wherein the formwork wall body or the temporary closing wall body has a hollow internal space and can be transported in a floating state on the water surface.   The formwork wall or the temporary closing wall can be adjusted in buoyancy acting on the formwork wall and the temporary closing wall by changing the ratio of gas and liquid in the internal space. The method for reinforcing an underwater structure according to any one of claims 1 to 3.   The method for reinforcing an underwater structure according to any one of claims 1 to 4, wherein after the reinforcement work is finished, the formwork wall is left without being removed. A wall for a formwork installed around the underwater structure and filled with a filler between the underwater structure;
A space is installed around the underwater structure above the formwork wall, and the space for reinforcing the underwater structure by draining water between the underwater structure and the underwater structure. A temporary deadline structure having a temporary deadline wall formed.

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