JP2017025585A - Repair construct of underwater wall surface of structure and repair method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair construct of an underwater wall surface of a concrete structure, the repair construct capable of shortening a repair construction period, eliminating passage disorders such as ships, shortening an underwater work time of a worker, and superior in safety, and provide a repair method for the same.SOLUTION: A concrete form support board 2 disposed in a bottom ground 51 comprises a substrate 3 and a support plate 4 standing up substantially at a right angle. A form 6 is installed with a lower end supported by the form support board 2 while facing an underwater wall surface 52A containing a repair wall surface 52B of a concrete structure 52, and an upper end side supported by the upper end side of the structure 52. A form supporting cord 8 fixes a base end side to the underwater wall surface 52A, the tip side of a cord 8A is inserted to the form 6 and engaged by a clip 8D, and thereby the form 6 is supported at intervals of approximately 500 mm with respect to the underwater wall surface 52A. Underwater insoluble mortar is filled and solidified in a space 7 between the form 6 and the underwater wall surface 52A to cover the underwater wall surface 52A by a concrete layer 10, and the form 6 is disengaged and removed from the form supporting cord 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure capable of repairing damage to a submerged underwater wall of a concrete structure such as a breakwater, quay wall, revetment, etc. in a short time, safely and inexpensively, and without affecting the navigation of a ship or the like. The present invention relates to an underwater wall repair structure and a repair method thereof.

  For example, a concrete breakwater installed in a harbor gradually deteriorates its underwater wall surface due to deterioration over time of the concrete, and collision of wave power and drift ice, but this damage gradually expands if left untreated and the strength as a breakwater is lost. Leading to a situation. Therefore, the conventional repair method is to assemble a workplace that forms a work space by setting up a scaffold from the ground of the seabed so as to surround the damaged wall surface, Workers perform repair work such as mortar coating on damaged walls.

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  However, the above-described prior art has a problem that the work place is installed in a state of projecting from the breakwater into the bay approximately 1,500 mm in order to form a work space, which obstructs navigation of the ship in the port. In addition, installation of a work place in the sea that receives repeated wave forces requires appropriate strength, which requires the installation days and labor, the problem of increased costs, and sudden changes in the weather during work. There is a problem of ensuring the safety of workers.

  The present invention has been made in view of the above-described problems of the prior art, and since a conventional work place is not installed in the water, the repair work period can be shortened, and the amount of protrusion into the port is also minimal, so navigational obstacles such as ships In addition, it is an object of the present invention to provide a structure for repairing an underwater wall surface of a concrete structure that is excellent in safety because an operator's underwater work time is short, and a repair method thereof.

  The present invention according to claim 1 configured to solve the above-described problems is a concrete formwork support board in which a support plate stands up at a substantially right angle from one end side of a substrate placed on the bottom of the ground, and the formwork support. A lower end is supported on the board, and stands up against the underwater wall surface including the repair wall surface of the concrete structure along the support plate, and the upper end side is a plurality of molds supported on the upper end side of the structure; A base end side is fixed to the underwater wall surface, and a front end side is locked to the mold frame, thereby forming a plurality of formwork support ropes that support the mold frame at a constant interval with respect to the underwater wall surface, The space between the frame and the underwater wall surface is filled with cement and solidified, and the underwater wall surface is covered with a concrete layer, and the mold frame is detached from the mold frame support rope and removed from the concrete layer.

  According to a second aspect of the present invention, there is provided a concrete formwork support plate in which a support plate stands up at a substantially right angle from one end side of a substrate placed on the water bottom ground, and a concrete structure constructed on the water bottom ground. A form frame comprising a plurality of horizontally long permanent mold panels facing the underwater wall surface including the repair wall surface of the object and stacked upward from the formwork support board, and being inserted from the mold frame to the underwater wall surface. A plurality of formwork support rods for supporting the formwork at a fixed interval with respect to the underwater wall surface, and filling and solidifying cement in a space between the formwork and the underwater wall surface so as to cover the underwater wall surface with a concrete layer. Consists of

  And it is good to provide the said board | substrate with the several horizontal adjustment tool for setting to a horizontal state.

  The mold may be a vertically long rectangular plate.

  Further, the formwork support rope includes a non-corrosive and non-rusting cord, a fixed shaft fixed to the proximal end side of the cord and embedded in the wall surface of the repair water, and the cord inserted into the formwork. It is good to comprise from the latching tool which supports this formwork by providing in the front end side of detachable.

  Moreover, the said formwork support rope is good to provide one or more concrete latching blocks in the longitudinal direction of a cord.

  Furthermore, the said formwork support rod is good to shape | mold by mixing a nonmetallic reinforcement material in mortar.

Furthermore, the concrete layer may be supported by a plurality of differential bar anchors protruding from the underwater wall surface.

Further, the means constituting the present invention according to claim 9 is a step of forming a substantially L-shaped concrete formwork support plate in which a support plate rises from the substrate, a step of leveling the ground of the water bottom, and a leveling step. Placing the base plate on the ground and placing the formwork support plate in a state where the support plate faces an underwater wall surface including a repair wall surface of a concrete structure; and supporting the formwork support plate on the underwater wall surface A step of disposing the formwork in an opposing state; and a plurality of formwork support ropes that fix the base end side to the underwater wall surface and lock the distal end side to the underwater wall surface with respect to the underwater wall surface A step of forming a space between the formwork and the underwater wall surface by supporting at a constant interval, a step of filling the space with cement and forming a concrete layer covering the underwater wall surface, and the concrete layer After forming, remove it from the formwork support rope And a step of removing the serial-type frame.

Further, the means constituting the present invention according to claim 10 includes a step of forming a substantially L-shaped concrete formwork support plate in which a support plate rises from the substrate, a step of leveling the ground of the water bottom, and a leveling step. Placing the formwork support plate in a state where the substrate is positioned on the ground and the support plate faces an underwater wall surface including a repair wall surface of a concrete structure; A mold is formed by stacking upward from the mold support board facing the mold, and between the mold and the underwater wall surface by inserting a mold support rod from the mold frame to the underwater wall surface. And forming a concrete layer covering the underwater wall surface by filling the space with cement.

Since the present invention is configured as described above, the following effects can be obtained.
(1) The mold is installed in a state close to the underwater wall surface by the formwork support board and the formwork support rope, and the formed space is filled with cement and solidified to cover the underwater wall surface with a concrete layer. Since only about half of the conventional work place protrudes into the harbor, the frame does not hinder the navigation of the ship, and no work scaffold is installed, so that repair work can be performed in a short period of time.
(2) Since the outer surface of the concrete layer covering the underwater wall surface including the repaired wall surface is covered with a mold formed of a plurality of permanent mold panels, the durability of the concrete layer can be enhanced. In addition, since the mold has a configuration in which a plurality of horizontally long permanent mold panels are stacked, the mold can be set to a height that covers the underwater wall in consideration of the height of the repair wall.
(3) Since the substrate of the formwork support board can be adjusted to a substantially horizontal state by a plurality of flat adjusters provided apart from each other, the standing formwork can be supported substantially vertically.
(4) Since the formwork is formed in a vertically long rectangular plate, it can be used for repairing a repair wall having a height.
(5) Since the formwork support rope is composed of a non-corrosive, non-rusting cord and a fixed shaft made of mortar, the cord does not impair the strength even if it is buried in the concrete layer, Since there is no corrosion due to rust unlike conventional metal separators, the concrete layer is not deteriorated.
(6) The formwork support rope for supporting the formwork has a structure in which the base end side is fixed to the underwater wall surface including the repair wall surface, and the distal end side is inserted into the formwork and locked from the outside with a locking tool. And, it has the strength that can resist the pressure received when the cement is filled in the space between the mold and the underwater wall surface, and the installation work of the mold can be easily and quickly performed.
(7) Since the formwork support rope is provided with one or more concrete locking blocks in the middle of the cord in the longitudinal direction, the concrete layer can be firmly fixed, so that the concrete layer can be prevented from peeling off the underwater wall surface.
(8) Since the permanent formwork panel of the formwork is supported by the formwork support rod that is inserted into the underwater wall surface at the front end side, the work for disposing the formwork can be performed in a short period of time. Can be reliably supported.
(9) Since the concrete layer is supported by a plurality of differential anchors protruding from the underwater wall surface, the phenomenon that the concrete layer peels from the underwater wall surface can be strongly prevented.

1 to 8 relate to a first embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing an entire structure of a repair structure. It is a top view of a formwork support board. It is a front view of a formwork support board. It is a rear view of a formwork support board. It is a VV arrow direction sectional view in FIG. It is a center longitudinal cross-sectional view of a formwork support board. It is a VII-VII arrow direction sectional view in FIG. It is composition explanatory drawing of a formwork support rope. 9 and 10 relate to the second embodiment, and FIG. 9 is an explanatory diagram of a repaired state of the structure. It is a longitudinal cross-sectional view which shows the whole structure of the structure for repair.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 8 show a first embodiment. In the figure, 51 indicates the ground of the seabed, 52 indicates a breakwater installed on the ground 51, and the breakwater 52 has a part of the underwater wall 52A formed into a concave shape due to aging of concrete, impact of wave force, collision of drift ice, etc. The repair wall surface 52B is damaged and needs repair.

Reference numeral 1 denotes a repair structure for repairing the repair wall surface 52 </ b> B, and 2 denotes a concrete formwork support plate constituting the repair structure 1. 3 is a substrate that constitutes the formwork support plate 2 and is installed on the seabed ground 52. The substrate 3 is formed in a substantially rectangular shape in a plan view, a horizontally long rectangular filling hole 3A is formed in the center, and the center of the lower surface 3B is formed. In the longitudinal direction, concave and convex grooves 3C and 3D communicating with the filling hole 3A are formed in the longitudinal and lateral directions so that the substrate 3 is positioned diagonally and a pair of front leg portions 3E and 3E and rear leg portions 3F and 3F. The shape is formed.
As shown in FIG. 7, each front leg 3E is formed with a shaft insertion hole 3G in the vertical direction and a hexagonal nut fitting hole 3H coaxially formed at the lower end side of the shaft insertion hole 3G. Further, a shaft insertion hole 3J is formed in the longitudinal direction on both sides of the filling hole 3A on the rear side of the substrate 3, and a hexagonal nut fitting hole 3K is coaxially formed on the lower end side of the shaft insertion hole 3J. is there.

  Reference numeral 4 denotes a substantially rectangular support plate that stands up at a substantially right angle from the rear end side of the substrate 2. It is.

5, 5,... Show four horizontal adjustment tools for adjusting the substrate 3 to a substantially horizontal state with respect to the seabed ground 51 on an uneven ground. The horizontal adjustment tools 5 are fitted in the horizontal adjustment shafts 5A, which are rotatably inserted into the shaft insertion holes 3G, 3J, and the nut fitting holes 3H, 3K of the board 3, and the horizontal adjustment shafts 5A are screwed together. And a nut 5B. Then, the horizontal adjustment shaft 5A is screwed into the fitted nut 5B from above and turned, whereby the horizontal adjustment shaft 5A enters and exits the lower surface 3B of the substrate 3 so that the substrate 3 is substantially horizontal with respect to the ground 51. It can be adjusted to the state.
Here, the horizontal adjustment shaft 5A and the nut 5B are made of mortar, and the mortar has “Blast furnace slag, fiber-containing polymer cement mortar” having excellent salt resistance, chemical resistance, and crack resistance. By using the trademark, the horizontal adjustment shaft 5A and the nut 5B have strength and durability.

  Reference numeral 6 denotes a steel plate form for forming a space 7 for filling a mortar for forming a concrete layer 10 described later covering the repair wall surface 52B. The mold 6 is composed of a flat plate portion 6A, reinforcing ribs 6B protruding from the flat plate portion 6A, and a plurality of cord insertion holes 6C formed in the flat plate portion 6A at appropriate intervals.

Reference numeral 8 denotes a formwork support rope for supporting the formwork 6 at a constant interval of about 500 mm with respect to the underwater wall surface 52A including the repair wall surface 52B. The formwork support rope 8 includes a non-corrosive, non-rusting cord 8A made of carbon fiber, glass fiber, and the like, and a plurality of concrete locking blocks 8B formed by connecting the middle of the cord 8A. , 8B, formed into a round bar shape by mortar, fixedly attached to the base end side of the cord 8A, and the cord 8A inserted into the cord insertion hole 6C of the mold 6 so as to be detachably engaged with the mold 6 And a clip 8D for fixing the.
Incidentally, the clip 8D is a catching tube 8D ₁ to inserting the code 8A, Yes constructed from the wedge 8D ₂ Metropolitan sandwiching while pressing the cord 8A is inserted into該拘lifting cylinder 8D _1, wedge 8D ₂ is By connecting to the holding cylinder 8D ₁ with a synthetic resin string 8D ₃ , it is prevented from dropping during work and losing during storage.

The formwork support rope 8 having the above-described configuration fills the insertion hole 52C formed in the underwater wall surface 52A including the repair wall surface 52B with mortar, and inserts and fixes the fixed shaft 8C. The cord 8A is inserted through the cord insertion hole 6 of the mold 6 and pulled out, the clip 8D is engaged with the cord 8A, and the cord 8A is pressed against the mold 6 to tension the cord 8A.
Thereby, since the formwork 6 is supported in the state pulled near by the underwater wall surface 52A, it can resist the pressure at the time of filling the space 7 with mortar.

  9, 9,... Represent differential anchors that prevent the concrete layer 10 from peeling from the underwater wall surface 52 </ b> A. The differential muscle anchors 9 are inserted into the underwater wall surface 52A at appropriate intervals. Each differential muscle anchor 9 includes a shaft portion 9A and a head portion 9B formed at the tip of the shaft portion 9A, and is formed of efmol made of the same material as the horizontal adjustment shaft 5A and the nut 5B. And the differential reinforcement anchor 9 has prevented the concrete layer 10 from peeling from the underwater wall surface 52A because the part which protrudes from the underwater wall surface 52A will be in the state embed | buried in the concrete layer 10. FIG.

  This embodiment has the above-described configuration, and the construction and operation will be described next. First, the underwater wall surface 52A of the breakwater 52 is inspected to confirm the state of the repair wall surface 52B, and adhering substances such as seaweed are removed. Next, the seabed ground 51 below the repair wall surface 52B is excavated and leveled as much as possible to install the substrate 3 of the mold support 2. In this case, the position of the substrate 3 is determined so that the mold 6 faces in a state of being separated from the underwater wall surface 52A by about 500 mm. In addition, an appropriate number of the substrates 3 is arranged in line with the width in the lateral direction of the repair wall surface 52B.

The ground 51 on which the substrate 3 is installed is the seabed, and since it is underwater work, it is difficult to make the ground level completely flat. The horizontal adjustment tools 5 are arranged so that the substrate 3 is in a substantially horizontal state. Adjustment is performed by rotating the adjustment shaft 5A to move up and down. When the substrate 3 is adjusted to a horizontal state, the mortar is filled so as to fill the periphery and the lower side of the substrate 3 and fixed with the interstitial concrete M so as to be substantially flush with the ground 51. The mortar flows into the concave grooves 3C and 3D from the ground 51 and the filling hole 3A around the substrate 3, so that the substrate 3 is firmly installed on the ground 51 in a state where it is buried in the interstitial concrete M.
Note that a concrete overhang 52D is formed at the upper end of the breakwater 52 if necessary to place the mold 6 in a state of being separated from the underwater wall surface 52A by about 500 mm.

  Next, the mold 6 is disposed opposite to the underwater wall surface 52A with a distance of about 500 mm. The mold 6 is placed on the substrate 3 to support the lower end 6C, and the upper end 6D is fixed to the upper end side or overhanging part 52C of the breakwater 1 with the mold support 8 or bolts, and the mold 6 and the underwater wall surface 52A A space 7 for filling a mortar of about 500 mm is formed between the two.

An operator enters the space 7 formed as described above from the side, and performs an operation of fixing the placed mold 6 to the underwater wall surface 52 </ b> A by the mold support rope 8. That is, the insertion hole 52C is drilled in the underwater wall surface 52A corresponding to the position of the cord insertion hole 6C of the mold 6. When the insertion hole 52C is filled with mortar, the insertion shaft 8C of the mold support rope 8 is inserted and fixed, and the plurality of mold support ropes 8 are inserted into the underwater wall surface 52A, the cord 8A is attached to the code of the mold 6 The state is drawn through the insertion hole 6C to the outside.

Next, the clip 8D is engaged while applying tension to the cord 8A drawn out of the mold 6, and the mold 6 is installed in a state of being biased toward the underwater wall surface 52A.
In this way, when the mold 6 is supported on the underwater wall surface 52A by all the mold support ropes 8 and installed in a state where the mold 6 covers the underwater wall surface 52A including the repair wall surface 52B, The inseparable mortar is filled to completely cover the underwater wall surface 52A including the repair wall surface 52B. FIG. 1 shows the mortar filling process, but the space 7 is completely filled to cure the mortar. The concrete layer 10 formed by hardening of the mortar is engaged with the plurality of locking lumps 8B formed on the cord 8A, and a plurality of differential anchors 9 are embedded, so that the concrete layer 10 is in close contact with the underwater wall surface 52A. It will be in a state and will not peel off.

Finally, when the concrete layer 10 is formed, the clip 8D is removed from the cord 8A, and the mold 6 is pulled out from the cord 8A and removed to complete the repair work. Although the cord 8A remains embedded in the concrete layer 10, it is molded from a strong non-rusting material, so that the concrete layer 10 is firmly supported and not deteriorated.

Thus, in the present embodiment, the metal plate mold 6 is removed, so that the underwater wall surface 52A is repaired without using metals that deteriorate concrete due to rusting. However, since the mold 6 can be reused, the cost can be reduced. Further, the work on the underwater wall surface 52A is only drilling the insertion hole 52C, stretching the formwork support rope 8 between the underwater wall surface 52A and the mold 6, filling the mortar, and removing the mold 6. It can be carried out without difficulty in the space 7 of about 500 mm.

  Next, FIGS. 9 and 10 show a second embodiment. In addition, in this Embodiment, the same code | symbol is attached | subjected and used for the component same as the component of 1st Embodiment, and the description is abbreviate | omitted. In the figure, reference numeral 11 denotes a construction scaffold, and the construction scaffold 11 is provided with vertical pillars 11A made of steel supported on each of the formwork support boards 2, and is erected at a predetermined interval, and the upper end is supported by upper and lower horizontal pillars 11B and 11C. The arm struts 11D project from the vertical struts 11A at a substantially right angle toward the rear, and the arm struts 11D are connected by connecting members 11E and 11E. 52 is engaged with the upper surface 52E.

Reference numeral 12 denotes a repair structure, 13, 13,... Constitutes the repair structure 12, and is a mold formed inside the installation scaffold 11 so as to face the underwater wall surface 52B. A horizontally long permanent mold panel 13A is formed by sequentially stacking upward from the mold support board 2. The permanent form panel 13A is made of a concrete panel having a thickness of about 150 mm mixed with high-strength slag and reinforcing fibers such as carbon fibers.
Reference numeral 14 denotes a honeycomb panel made of the same material as the permanent mold panel 13A and having a thickness of about 150 mm formed by continuously connecting hexagonal recesses on one side surface. It is formed by sequentially stacking upward from the frame support board 2 and is installed to increase the durability of the structure.

15, 15,... Are a plurality of mold support rods that are inserted from the mold 13 into the honeycomb panel 14 and the tip side 15 </ b> A is inserted into the underwater wall 52 </ b> A. Strength is provided by molding with the product name Fmol, which is a mixture of high-strength slag and reinforcing fibers such as carbon fibers.
Then, a space 7 (see FIG. 1) is formed between the mold 13 and the underwater wall surface 52A by a plurality of mold support rods 15, and the space 7 is filled with an underwater inseparable mortar and solidified. The concrete layer 10 covering the wall surface 52A is formed. When the mortar filling is completed, the construction scaffold 11 is removed.

  According to the present embodiment, since the concrete layer 10 is covered with the formwork 13 composed of a plurality of permanent formwork panels 13A, the durability of the concrete layer 10 can be enhanced.

Further, since the mold 13 is configured by stacking horizontally long permanent mold panels 13A in the height direction, the height that covers the underwater wall 52A can be set in consideration of the height of the repair wall 52B. .

  As is apparent from the above embodiment, the present invention is configured to repair the underwater wall surface of the structure without using any metal material, thus solving the problem of deterioration in strength and deterioration due to rusting of the structure. In addition, since the mold and the mold support rod are molded with a mortar (trade name Fmol) mixed with high-strength slag and reinforcing fibers such as carbon fibers, it is excellent in strength and does not cause corrosion problems.

DESCRIPTION OF SYMBOLS 1,12 Repair structure 2 Formwork support board 3 Substrate 4 Support plate 5 Horizontal adjustment tool 6, 13 Formwork 7 Space 8 Formwork support rope 8A Code 8B Concrete locking block 8C Fixed shaft 8D Clip (locking tool)
9 Difference bar anchor 10 Concrete layer 13A Permanent form panel 15 Formwork support rod 51 Ground 52 Breakwater (concrete structure)
52A Underwater wall surface 52B Repair wall surface

Claims (10)

  A concrete formwork support plate in which a support plate stands up at a substantially right angle from one end side of the substrate placed on the water bottom ground, and a lower end is supported on the formwork support plate, and repair of the concrete structure along the support plate Standing up against the underwater wall surface including the wall surface, the upper end side is fixed to a plurality of molds supported on the upper end side of the structure, and the base end side is fixed to the underwater wall surface, and the distal end side is attached to each mold frame The underwater wall surface comprises a plurality of formwork support ropes that support the formwork at fixed intervals with respect to the underwater wall surface by engaging with each other, and the space between the mold frame and the underwater wall surface is filled with cement and solidified. A structure for repairing an underwater wall surface of a structure in which the formwork is covered with a concrete layer and the formwork is detached from the formwork support rope and removed from the concrete layer.   A mold support plate made of concrete in which a support plate stands up at a substantially right angle from one end side of the substrate placed on the bottom of the ground, and the mold facing the underwater wall including the repair wall of the concrete structure constructed on the bottom of the ground. A mold frame composed of a plurality of horizontally long permanent mold panels stacked upward from the frame support board, and the mold frame is fixed to the underwater wall surface by being inserted from the mold frame to the underwater wall surface. A structure for repairing an underwater wall surface of a structure in which a space between the mold frame and the underwater wall surface is filled with cement and solidified so as to cover the underwater wall surface with a concrete layer.   The structure for repairing a repaired underwater wall surface of a structure according to claim 1 or 2, wherein the substrate is provided with a plurality of horizontal adjustment tools for setting in a horizontal state.   The structure for repairing an underwater wall surface of a structure according to claim 1, wherein the mold frame is a vertically long rectangular plate.   The mold support rope includes a non-corrosive and non-rusting cord, a fixed shaft fixed to the base end side of the cord and fixed to the underwater wall surface, and a distal end side of the cord inserted through the mold The structure for repairing the underwater wall surface of the structure according to claim 1, wherein the structure is configured to be provided so as to be detachably provided to support the formwork.   6. The structure for repairing an underwater wall surface of a structure according to claim 5, wherein the formwork support rope is provided with one or more concrete locking blocks in the longitudinal direction of the cord.   The structure for repairing an underwater wall surface of a structure according to claim 2, wherein the formwork support rod is formed by mixing a non-metallic reinforcing material into mortar.   The structure for repairing an underwater wall surface of a structure according to claim 1 or 2, wherein the concrete layer is supported by a plurality of differential bar anchors protruding from the underwater wall surface. A step of forming a substantially L-shaped concrete formwork support plate in which the support plate rises from the substrate, a step of leveling the ground of the water bottom, and the support plate is made of a concrete structure by positioning the substrate on the leveled ground. A step of installing the formwork support plate in a state of facing an underwater wall surface including a repair wall surface of an object, a step of placing the formwork in a state of being supported by the support plate and facing the underwater wall surface, and the underwater wall surface The mold frame and the underwater wall surface are secured to the underwater wall surface at a predetermined interval by a plurality of mold frame supporting ropes that fix the proximal end side to the mold frame and lock the distal end side to the mold frame. Forming a space there between, forming a concrete layer covering the underwater wall surface by filling the space with cement, and separating the mold frame from the mold support rope after the concrete layer is formed. Structure underwater with a process of removing Repair method of surface. A step of forming a substantially L-shaped concrete formwork support plate in which the support plate rises from the substrate, a step of leveling the ground of the water bottom, and the support plate is made of a concrete structure by positioning the substrate on the leveled ground. A step of installing the formwork support plate in a state of facing the underwater wall surface including the repair wall surface of the object, and a horizontally long rectangular permanent formwork panel facing the underwater wall surface and stacking upward from the formwork support plate. Forming a mold, forming a space between the mold and the underwater wall by inserting a mold support rod from the mold to the underwater wall, and filling the space with cement. A method of repairing the underwater wall surface of the structure, comprising the step of forming a concrete layer covering the underwater wall surface.

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