JP2018076709A - Wall structure repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a wall structure which can easily repair a joint portion of a wall structure in which a joint material is embedded in a joint and which has high durability of a repaired portion.SOLUTION: The repair method is a method of repairing the joint portion of the wall structure 1 in which the joint material 43 is buried in the joint 42 provided between each block body 41 and the block body 41. The wall structure is formed by connecting a plurality of concrete block bodies 41 in the width direction. The repair method includes a step of forming a hole 50 in a portion where the joint 42 of the wall structure 1 is provided, a step of inserting the pipe 52 having the expandable water stop film 54 formed on at least the side surface thereof into the hole 50.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for repairing a wall structure such as a revetment wall used for revetment.

  Among the wall structures that separate the two areas, those used for revetment separating the land and the sea are constructed by, for example, placing steel sheet piles along the shore and forming shade concrete above the steel sheet piles. The Since concrete expands and contracts, in the wall structure for revetment, that is, the revetment wall, gaps / joints are provided in the cap concrete at, for example, predetermined intervals, and joint materials such as elastomer plate-like members are provided on the joints. Has been inserted. This prevents the concrete from being damaged when it is expanded.

When the bituminous joint plate provided on the joint of the shaded concrete on the revetment wall is deteriorated due to aging or the like, the deteriorated portion tends to become a groundwater channel from the land side to the sea side. It is necessary to prevent water leakage from the revetment wall because it does not drain from the drainage ditch to the sea side.
In the case of repairing a deteriorated joint part of a revetment wall, conventionally, the shaded concrete around the joint is hung on the land side and the sea side, and then the deteriorated joint material is replaced.

  Patent Document 1 discloses a repair method in the case where a concrete structure cracks and leaks water. In this repair method, a V-shaped tube is suspended along the crack, and a tube made of a porous wall is laid in the V-shaped valley. Then, the quick-setting cement is embedded on the outside, and the adhesive injection pipe is arranged so that the tip comes into contact with the tube and the other end faces outward, and the water leakage guide hole and the surface are temporarily stopped. . Thereafter, a mortar is embedded outside the quick-setting cement, and then an adhesive is press-fitted from the above-mentioned pipe for injecting the adhesive, and then enters and hardens into the crack to repair the water leakage.

  Patent Document 2 discloses a method for repairing water leakage when a joint material between concrete frames deteriorates or drops and water leakage occurs. In this water leakage repair method, a tape-shaped water leakage repair material comprising a base material having flexibility and water shielding properties and a deformable adhesive layer bonded to the base material and having flexibility and water shielding properties is used. . The water leakage repair material is attached so as to cover the joints between the concrete frames.

Japanese Patent Publication No.61-4470 JP 2010-133203 A

  However, the above-mentioned conventional method, such as hanging the concrete around the joints on the land side and the sea side, requires work from the sea side, so it is necessary to assemble a scaffold for the work on the sea side. There were problems such as the lengthening of the repair period, the fact that the ship could not berth during the repair period, and that the repair work time was limited because it was not possible to work at high tide.

  Moreover, when repairing the joint part of the revetment shade concrete using the method disclosed in Patent Document 1, a case of working from the sea side is generally considered, and in that case, there is the same problem as described above. Although it is possible to work from the land side, in that case, a large-scale excavation work is involved on the land side, and there are problems in terms of cost and process.

  When repairing joints of revetment shade concrete using the method disclosed in Patent Document 2, since a tape-shaped water leakage repair member is used, it is not necessary to assemble a scaffold even if working from the sea side. Such a water leakage repair member is low in durability and requires repeated repair work.

  The present invention has been made in view of such a point, and is a wall structure in which joint materials are embedded in joints formed by connecting a plurality of concrete block bodies in the width direction. It is an object of the present invention to provide a method for repairing a wall structure that can easily repair a joint portion and has a highly durable repaired portion.

  In order to achieve the above object, the present invention comprises a plurality of concrete structures arranged in the width direction, and joint materials are embedded in joints provided between the structures. A method for repairing a joint portion of a wall structure, the step of forming a hole in the portion of the wall structure where the joint is provided, and a columnar body having an inflatable waterproof film formed at least on the side surface. And the step of inserting into.

  The columnar body is a bottomed columnar body, and may include a step of filling the bottom of the hole with a filler having viscosity and water-stop before the step of inserting the columnar body into the hole.

  The columnar body may have the expandable water stop film formed on the bottom surface.

  You may include the process of fixing the suppression member which suppresses that the columnar body inserted in the said hole floats.

  The structure may be disposed on an upper portion of the steel structure material, and the depth of the hole may be a depth at which a top portion of the steel structure material is exposed.

  It may include a step of immersing and expanding the expandable water blocking film of the columnar body inserted into the hole.

  The columnar body may be formed in a hollow shape, and may include a step of filling a hollow portion of the columnar body inserted into the hole.

  According to the wall structure repairing method of the present invention, the joint portion can be repaired easily, and the durability of the repaired portion can be increased.

It is a figure which shows an example of the wall structure repaired with the repair method of the wall structure which concerns on embodiment of this invention. It is a figure for demonstrating the repair method of the wall structure which concerns on embodiment of this invention. It is another figure for demonstrating the repair method of the wall structure which concerns on embodiment of this invention. It is another figure for demonstrating the repair method of the wall structure which concerns on embodiment of this invention. It is another figure for demonstrating the repair method of the wall structure which concerns on embodiment of this invention. It is a figure for demonstrating the effect of the repair method which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  Drawing 1 is a figure showing an example of a wall structure repaired with a repairing method of a wall structure concerning an embodiment of the present invention. FIG. 1 (A) is a side view showing only a later-described shaded concrete in cross section, and FIG. 1 (B) is a plan view of the underground showing only a shaded concrete in cross-section.

  The wall structure 1 of FIG. 1 (A) is a revetment, and a steel sheet pile wall 10 formed by continuously placing a plurality of steel sheet piles 11 along the shore, and the distance between the steel sheet pile walls 10. And a laying work 20 made of a steel sheet pile 21 embedded therewith. The wall structure 1 includes a tie rod 30 as a support member that connects the upper part of the steel sheet pile wall 10 and the upper part of the laying work 20.

Furthermore, the wall structure 1 includes a cap concrete 40 surrounding the upper portion of the steel sheet pile wall 10.
As shown in FIG. 1B, the shade concrete 40 includes a plurality of concrete block bodies 41 as “structures” according to the present invention. More specifically, the cap concrete 40 is formed by connecting concrete block bodies 41 continuously along the width direction of the wall structure 1, that is, along the shore.
A joint 42 is provided between the concrete block body 41 and the adjacent concrete block body 41, and a joint material 43 is embedded in the joint 42. The joints 42 are provided, for example, at intervals of 15 to 25 m. As the joint material 43, for example, an elastomeric plate-like member or a bituminous joint board is used.

  When the joint material 43 is damaged due to deterioration over time, as shown in FIG. 1A, when the high tide surface (HWL) and low tide surface (LWL) are higher than the groundwater level, The damaged part tends to become a groundwater drain.

  Therefore, in the case where there is groundwater leakage from the joint material 43 or at a predetermined time (for example, after a predetermined period has elapsed since the completion of the wall structure 1) in order to prevent leakage of groundwater from the joint material 43, the present embodiment. The wall structure repair method related to is performed.

  2-5 is a figure for demonstrating the repair method of the wall structure based on this embodiment. 2A, FIG. 3A, FIG. 4A and FIG. 5A are plan views of joint portions, FIG. 2B, FIG. 3B, FIG. 4B and FIG. (B) is the elements on larger scale near the top part of the steel sheet pile wall 10, FIG.4 (C) is the elements on larger scale of the edge part of the below-mentioned pipe. In FIG. 2 and subsequent figures, only the main part of the wall structure is shown.

(Hole formation process)
In the repair method of the wall structure 1 according to the present embodiment, more specifically, in the repair method of the joint portion 42 of the wall structure 1, first, as shown in FIG. 2 (A) and FIG. 2 (B). A circular hole 50 is formed by core boring or the like from the upper side in the vertical direction to the lower side in the portion where the joint 42 of the cap concrete 40 is provided. In this example, the hole 50 has an inner diameter of 150 mm and is formed so as to cover both of the adjacent concrete block bodies 41. Moreover, the depth of the hole 50 is the depth which the top part of the steel sheet pile 11 exposes, for example, 3000 mm.

(Filling process)
Following the hole forming step, asphalt 51 such as straight asphalt is filled at the bottom of the hole 50 as shown in FIGS. 3 (A) and 3 (B). The asphalt 51 is a filler having a viscosity and water-stopping property, and the asphalt 51 may have any viscosity as long as the asphalt 51 does not leak from at least the damaged portion of the joint material 43. The asphalt 51 is filled until the thickness of the asphalt 51 layer is about 100 mm.
When the hole 50 is formed so that the entire top portion of the steel sheet pile 11 is exposed in the hole forming step, the bottom surface of the hole 50 facing the lower end of the pipe 52 described later is not flat, but by filling the asphalt 51, 50, the surface facing the lower end of the pipe 52 can be made flat.

(Insertion process)
After the filling step, as shown in FIGS. 4A and 4B, a cylindrical pipe 52 which is an example of the “columnar body” of the present invention is inserted into the hole 50. Then, the pipe 52 is pressed against the asphalt 51 and fixed. As shown in FIG. 4C, the pipe 52 is made of, for example, a steel pipe 53 whose bottom is closed, and an inflatable water stop film 54 is formed on the side surface and the bottom. The inflatable water stop film 54 is a coating film formed by absorbing moisture in the air by standing after applying a swollen water stop material, and has a swellability and at least elasticity in the expanded state. Have. As the above-mentioned swelling water-stopping material, a material used for the joint portion of the steel sheet pile (see reference numeral 21a in FIG. 1B) for improving the water-stopping property of the steel sheet pile can also be used for the pipe 52.
More specifically, the outer diameter of the pipe 52 is, for example, φ120 to 130 mm, which is slightly smaller than the inner diameter of the hole 50. Therefore, there is a gap between the outer surface of the pipe 52 and the inner peripheral surface of the hole 50. However, the gap is closed by the expandable water stop film 54 that has expanded by absorbing groundwater, rainwater, and the like flowing into the hole 50.

(Restraining process)
Since the pipe 52 has the expandable water stop film 54 formed on the bottom surface, when the expandable water stop film 54 expands, a force that moves the pipe 52 upward is applied. As a restraining member for restraining the pipe 52 from floating when such a force is applied, an angle 55 is attached to the upper portion of the hole 50 as shown in FIGS. 5 (A) and 5 (B). The angle 55 is made of, for example, a steel plate, and both ends thereof are fixed to the concrete block body 41 with bolts or the like.

  As described above, when the wall structure 1 is repaired by the method according to the present embodiment, the hole 52 is formed in the joint portion 42, and the pipe 52 in which the inflatable waterproof film 54 is formed on the side surface in the hole 50. Therefore, even if the joint material 43 deteriorates and becomes a water channel, the ground water flowing through the water channel reaches the hole 50 and is blocked by the expandable water stop film 54 expanded by the ground water or the like. Therefore, it is possible to prevent groundwater from leaking from the wall structure 1 to the sea side.

  In addition, when the wall structure 1 is repaired by the method according to the present embodiment, the expandable water blocking film 54 has elasticity, so even if the cap concrete 40 expands or contracts, there is a gap in the joint 42. Does not occur, and the adjacent concrete block bodies 41 do not come into contact with each other and are not damaged.

  And in the repair method which concerns on this embodiment, since it is not necessary to work from the sea side, it can repair easily from the need to build a scaffold. Moreover, in the repair method which concerns on this embodiment, since the tape-shaped thing is not used as a water leak repair member, durability is high.

  FIG. 6 is a view for explaining further effects of the repair method according to the present embodiment, and is a partial cross-sectional view showing an enlarged bottom portion of the hole 50.

As described above, the inflatable water blocking film 54 is also formed on the bottom of the pipe 52, and the angle 55 is attached to the top of the pipe 52 so that the pipe 52 cannot move upward. .
In addition, as shown in FIG. 6A, a crack 41a may occur in the shaded concrete 40 around the hole 50.

Since the pipe 52 cannot move upward as described above, when the inflatable water stop film 54 of the pipe 52 expands, there is a force to press the pipe 52 against the asphalt 51 downward, that is, toward the steel sheet pile wall 10. work. Thereby, as shown in FIG. 6B, the base of the crack 41a on the hole 50 side is filled with the asphalt 51.
Therefore, in the wall structure 1 repaired by the method according to the present embodiment, it is possible to prevent water leakage caused by the crack 41 a formed around the hole 50, that is, around the top of the steel sheet pile wall 10.

  Since groundwater cannot pass through the steel sheet pile wall 10, most of the ground water that flows from the inland toward the steel sheet pile wall 10 reaches the top of the steel sheet pile wall 10. Therefore, by blocking the crack 41a formed around the top of the steel sheet pile wall 10 as described above, the probability of water leakage can be greatly reduced.

(Additional process)
In the repair method of the wall structure according to the present embodiment, after the above-described restraining step, the expansion step of intentionally pouring water into the gap between the hole 50 and the pipe 52 and immersing and expanding the expandable water stop film 54. May be added.

In the above example, the expandable water stop film 54 is swellable, but is not limited to swellability, and may have a property of expanding over time.
In the above example, asphalt 51 is used as a filler for filling the bottom of the hole 50, but coal tar may be used instead.
The shape of the hole 50 is a circle in the above example, but is not limited to a circle and may be a square or the like. However, the hole 50 can be easily formed if it is circular.
In the above example, the pipe 52 is a steel pipe, but is not limited thereto, and may be a polyvinyl chloride pipe or the like. However, if it is a steel pipe, durability can be made high.

  In the above description, the revetment has been described as an example of the wall structure to be repaired by the method according to the present embodiment, but a concrete water tank, a concrete pit, or the like can also be repaired.

DESCRIPTION OF SYMBOLS 1 ... Wall structure 10 ... Steel sheet pile wall 11 ... Steel sheet pile 20 ... Circular steel pipe 21 ... Steel sheet pile 30 ... Tie rod 40 ... Caps concrete 41 ... Concrete block body 41a ... Crack 42 ... Joint 43 ... Joint material 50 ... Hole 51 ... Asphalt 52 ... Pipe 53 ... Steel pipe 54 ... Expandable water blocking membrane

Claims (7)

A method of repairing a joint part of a wall structure comprising a plurality of concrete structures arranged in the width direction, and joint materials are embedded in joints provided between the structures. ,
Forming a hole in the portion of the wall structure where the joint is provided;
A method of repairing a wall structure, comprising: inserting a columnar body having an inflatable waterproof film formed at least on a side surface into the hole. The columnar body is a bottomed columnar body,
Before the step of inserting the columnar body into the hole,
The method for repairing a wall structure according to claim 1, further comprising a step of filling the bottom of the hole with a filler having viscosity and water-stopping property.   The wall structure repair method according to claim 2, wherein the columnar body has the inflatable water stop film formed on a bottom surface.   The method for repairing a wall structure according to claim 3, further comprising a step of fixing a suppressing member that suppresses the columnar body inserted in the hole from floating. The structure is disposed on top of a steel structure;
The depth of the said hole is a depth which the top part of the said steel structure material exposes, The repair method of the wall structure of any one of Claims 1-4 characterized by the above-mentioned.   The method for repairing a wall structure according to any one of claims 1 to 5, further comprising a step of immersing and expanding the expandable water blocking film of the columnar body inserted into the hole. The columnar body is formed hollow,
The method for repairing a wall structure according to any one of claims 1 to 6, further comprising a step of filling a hollow portion of the columnar body inserted into the hole.

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