JPH0565672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing water intrusion and leakage from cracks occurring in concrete structures such as tunnels, basements, dams, dams, swimming pools, and outdoor structures.

(Prior art) A conventional method for preventing water intrusion and leakage from cracks in concrete buildings is to cut out the cracked concrete surface in a V-shape, insert a resin injection pipe into the V-shaped cutout, and insert a resin injection pipe above the crack. Fix the resin injection pipe to the concrete wall by pouring quick-setting mortar to bury the resin injection pipe. After that, an injection nozzle is attached to the resin injection pipe and urethane foam resin is injected, and the injected urethane foam resin comes into contact with water and foams, entering the deep part of the crack and the branch crack, and hardening the adhesive. This is to stop the water from flowing. In addition, as a method for repairing this type of concrete crack, a roughly bowl-shaped injection machine is held pressed against the area to be repaired on the concrete wall by a telescoping support, and then a coagulant is applied inside the bowl of this injection machine. is pumped by a compressor,
A method of injecting a coagulant into cracks in concrete from inside the bowl is known from Japanese Patent Publication No. 38310/1983.

Another repair method is to attach a plate-shaped repair member to the surface of the repaired area at a small distance from the concrete surface, seal the periphery of the repair member with the concrete surface with a sealing member, and then install the repair member within the space between A method is known from JP-A-60-138168, in which the air is evacuated with a pump to create a vacuum state, and then a filler is sucked into the space between them using the negative pressure, thereby repairing the repair member and the filler. It is being In addition, a method for repairing concrete structures is disclosed in Japanese Patent Application Publication No. 2003-11101, in which a groove of a predetermined width and depth is opened around the crack in the concrete structure, and then a layer of glass fiber is laid in the groove, and then a layer of quick-setting cement is filled. It is disclosed in the publication No. 61-196071. A technique for injecting foamed resin into repaired areas of a panel material is disclosed in Japanese Patent Application Laid-open No. 114376/1983.

(Problems to be solved by the invention) In the conventional water stop method using a V-shaped notch,
The process requires drilling a V-shaped notch along the cracks in the concrete wall, inserting a resin injection pipe, and placing quick-setting cement, which is time-consuming and must be completed in a short time. This has been a problem when working in tunnels, etc. Furthermore, if the crack is curved, if there are many cracks running perpendicular to the main crack, or if there are many cracks in the periphery, it is difficult to stop water using conventional methods. Also, special public service 1977-38310
The water stop foam method disclosed in the publication requires long support members in large tunnels, and in many cases there is no support member on the side facing the repaired area on slopes and external vertical walls of buildings. . Concrete cracks are often long and continuous, so if the filler is poured from one spot, it will move along the crack and leak out from the opening of another crack, contaminating the site, or the filler may penetrate deep into the crack. becomes insufficient. If a large number of bowl-shaped injection machines are installed along the crack in order to solve this problem, a large number of support members will be used, and the support members will become complex and difficult to support. The support member blocks the movement of vehicles, people, and equipment, so it cannot be used in areas where there is a lot of traffic and movement of cars, people, and goods. Furthermore, the injection machine, support member, and compressor must be used for a long time until the coagulating material penetrates deeply and hardens, resulting in poor work efficiency. There is a problem.

Next, in the repair method disclosed in JP-A No. 60-138168, it is necessary to create a vacuum state at the concrete repair area using the repair member and the seal member, and in many cases, it is not possible to create a vacuum state. In that case, this repair method cannot be used. For example, cracks may open on the back side of repaired concrete walls on slopes, pools, drainage channels, etc. It is also difficult to seal when continuous cracks open far away or on the sides.
Since repair parts are made of a long single plate, it is difficult and time-consuming to manufacture repair parts that follow the shape of the concrete wall when the concrete wall is curved or bent, such as in a tunnel wall. . Since it is suctioned with negative pressure of a vacuum, the force to advance it to the deep part of the crack is weak. There is a problem. Furthermore, the repair method described in JP-A-61-196071 requires the creation of grooves in the concrete wall, but it is difficult to create such grooves on the curved concrete walls of tunnels and subways. A large amount of chisel debris is generated and becomes a traffic obstruction.
It takes time to clean, and there is also the problem that it cannot be installed in areas where there is a large amount of water leakage.
The method of repairing panel materials using foamed resin disclosed in Japanese Patent Application Laid-open No. 59-114376 simply involves injecting foamed resin, so in the case of concrete structures with continuous cracks that open on the surface, foaming will occur from the openings on the concrete surface. The resin discharges and contaminates the work site, so it cannot be used as it is to stop water from cracks in concrete structures.

(Means for Solving the Problems) The present invention solves these problems, shortens the construction period, is easy to perform even if the main crack is curved, and is easy to install even if the main crack is curved. It is possible to work at these locations without interfering with traffic and traffic, and it is also possible to stop water from concrete cracks opened at the back, and it can be used to repair wide concrete cracks and cracks, and it can also reliably stop branch cracks and peripheral cracks at the same time. The purpose of this invention is to provide a practical method for water-stopping cracks in concrete buildings.

The gist of the present invention is as follows: (1) A method for stopping water from cracks in a concrete structure, which comprises the first to third steps of (a) to (c) below. The first step of planting (b) A large number of water sealing boxes with open bottoms are placed adjacent to each other by laying packing along the crack line and straddling the crack line. 2nd step of fixing it in pressure contact with the surface of the concrete structure using the above-mentioned anchor bolts. The injection is stopped when the water sealing agent is filled in the sealing box, the water sealing agent sealing box is sealed, and the water sealing agent sealed inside the box is sealed using the foaming pressure generated by the foaming expansion. The water sealing agent penetrates deeply into the crack, and the water sealing agent remaining inside the crack and inside the box hardens and seals the crack, preventing water leakage.
Third step (2) of preventing water intrusion: The method of stopping water from cracks in a concrete structure according to claim 1, wherein the water stopping agent is a hydrophilic one-component urethane/foamed resin.

(Example) Examples will be described below based on the drawings.

In this example, a hydrophilic one-component urethane foam resin (TACSS [trade name], NL Paste [trade name]) was used as the water sealing agent 1, and a 250× A 300 mm stainless steel box body 3 is used, and both sides 4 on the long side are sloped downward in a downwardly expanding shape, and bolt holes 5 are provided at the four corners of the top surface, and short valves 13 are installed at two locations on the top surface. A water stop agent injection pipe 6 and a discharge pipe 7 with a valve 14 are attached. 8 in the figure is the concrete wall of a concrete building.
9 is a crack, 10 is an anchor bolt, 11 is a fastening nut of the box body 3, and 12 is a packing.

In this embodiment, first, anchor holes are drilled in sets of four along the main line of the crack 9 so as to cross the line, and anchor bolts 10 are implanted in the holes (see Fig. 1A, Fig. 2). (See Figure A).

Next, lay out the □-shaped packing 12, place the water sealing agent sealing box 2, and insert the anchor bolt 10 into the bolt hole 5.
The water sealing agent sealing box 2 is fixed to the concrete wall surface 8 in a press-contact state by screwing a tightening nut 11 therethrough. A large number of water sealing agent sealing boxes 2 are similarly fixed in succession (see FIG. 1B and FIG. 2B).

After that, the valves 13 and 14 of the water stop agent injection pipe 6 and the drain pipe 7 are opened, and the water stop agent 1, which is a urethane-based 8-fold foamed resin, is injected into the box from the water stop agent injection pipe 6.
Press fit inside.

As the box is press-fitted, water and air inside the box are discharged from the discharge pipe 7. After water and air have been sufficiently discharged, the valve 14 of the discharge pipe 7 is closed. Then, the injected water sealing agent 1 made of 8x foamed resin foams and expands, and its expansion pressure causes the water sealing agent to enter through all the crack openings in the concrete wall inside the box body 3, and to penetrate deep into the concrete wall and its branches. Penetrates deep into cracks. After the injection is completed, the valve 13 of the water stop agent injection pipe 6 is also closed. The inside of the box body is sealed because there is also a seal 12 with the wall surface, and the expansion force of the foam acts as a force that causes the water stop agent 1 to enter the cracks 9 because the anchor bolts firmly fix the box body 3 to the concrete wall surface.

In this way, the water sealing agent 1 penetrates deep into the cracks 9 on the entire surface, and the concrete is adhesively hardened to fill the voids, thereby preventing water leakage and water intrusion from the cracks.

By performing this process on all the water sealing agent sealing boxes 2, water leakage and water intrusion from cracks can be prevented (see FIG. 1C and FIG. 2C).

After the water sealing agent hardens, the water sealing agent sealing box 2 may be left in place permanently, or may be removed after the construction is completed. Even if the concrete wall surface at the location of the crack 9 is concavely curved, since the box bodies 3 are continuous with the side surfaces that are slanted toward the end, the side faces of adjacent box bodies 3 will not come into contact with each other, and the concave shape will be continuous. (See Figure 1, c).

Note that the water sealant sealing box does not necessarily require both a water sealant injection pipe and an exhaust pipe.

(Effects of the Invention) As described above, according to the present invention, the work to stop water from cracks in concrete walls only involves fixing the box with anchor bolts and injecting a water stop agent, so the construction period can be greatly shortened. . Once the water-stopping agent has been injected into the box, the box is simply sealed, and the water-stopping agent enters the cracks without the need for any manual labor or equipment, and the foam expands automatically and without any action. Work efficiency is good because it is done using pressure. It can also be installed in areas with heavy traffic. In addition, the water stop agent can penetrate not only into the main crack but also into the cracks around it and deeply, thereby making it possible to more completely stop water. Furthermore, even if the main crack line is bent, the water stopper can be injected over the area, making it possible to stop water without any difficulty. It can stop water even if the back side of the slope or tunnel is ground or water, and it does not require long support members to fix the box to the wall, so it is suitable for areas with heavy traffic or for repairing large concrete walls. I can handle it.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the working process of the present invention, Figure 2
The figures are explanatory diagrams showing cross-sectional states of each work step of the present invention, and FIG. 3 is a perspective view of the water sealing agent sealing box. 1: Water sealing agent, 2: Water sealing agent sealing box, 3: Box body,
4: Side, 5: Bolt hole, 6: Water stop agent injection pipe,
7: Discharge pipe, 8: Concrete wall, 9: Crack, 10: Anchor bolt, 11: Tightening nut,
12: Patsukin, 13, 14: Valve.

Claims (1)

[Scope of Claims] 1. A method for stopping water from cracks in a concrete structure, comprising the first to third steps of (a) to (c) below. (b) First step of planting a large number of anchor bolts along the crack lines of the concrete structure (b) Sealing with water sealing agent with the bottom open in a state where packing is laid along the crack lines and the bottom is opened so as to cross the crack lines Arrange a large number of boxes in a row next to each other,
Moreover, the second step (c) is to fix the box in pressure contact with the surface of the concrete structure using the above-mentioned anchor bolts. The injection is stopped when the water sealing agent is filled in the water sealing box, the water sealing box is sealed, and the water sealing agent sealed inside the box is foamed and expanded. The third step is to penetrate deep into the crack using pressure, and the water sealing agent remaining inside the crack and inside the box is adhesively hardened, thereby sealing the crack and preventing water leakage and infiltration. A method for stopping water from cracks in a concrete structure according to claim 1, which is a liquid urethane/foamed resin.