JP2000170390A - Repairing method for water leakage from concrete structure and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform waterproofing repair work by using permeable waterproof agent capable of interrupting water leaking passages by the formation of a substance which is water repellent and non-permeable to water by the reaction with calcium component or the like in concrete in narrow gaps due to cracking. SOLUTION: This repair method and equipment for a water leaking portion in a concrete structure comprises an almost rectangular elastic membrane body 31 consisting of elastomer, a casing-shaped frame member 32 for retaining the outer peripheral portion of an elastic membrane body 31, an anchoring mechanism 33 for fixing the frame member 32 to a concrete wall surface 1a in a tight contact state, and an injection connector 34 comprising a pipe joint attached to a central portion of the elastic membrane body 31. An elastic membrane body 31 is swelled and deformed by injecting under pressure the permeable waterproofing agent S into a filling gap 35 formed between the concrete wall surface 1a and the elastic membrane body 31, and the permeable waterproofing agent S permeates to an exposed crack 2 within the region surrounded by the frame member 32, thereby creating water repellent and impermeable substances as secular changes and realizing water stop effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for repairing a leaked portion of a concrete structure caused by cracks, junkers, cold joint joints or the like by injecting a permeable waterproofing agent. .

[0002]

2. Description of the Related Art In concrete structures, cracks due to various factors such as neutralization due to aging of concrete, vibrations due to vehicle traffic on nearby roads, earthquakes, etc., and cement paste partially applied during construction of concrete skeleton. Rainwater (groundwater for underground structures), etc. in areas where the interface between the precast and postcast concrete was not sufficiently joined at the time of concrete splicing due to lack of mixing with junka, cold joints, etc. Can penetrate and cause water leakage. Such water leakage causes a reduction in the strength of the concrete by corroding the reinforcing steel inside the concrete skeleton layer and neutralizing the alkali component concrete. Therefore, it is necessary to reliably perform waterproofing by repair.

Conventionally, as a method of waterproofing and repairing a water leaking portion of a concrete structure, typically, as shown in FIG.
An injection hole 3 is formed on the wall surface of the concrete frame 1 to reach a water leakage path 2 by a crack, a junker or a joint of a cold joint using a drill or the like, and an injection device (not shown) is sealed in the injection hole 3. A construction method is adopted in which the cement slurry is added to the cement and added to water. The injected cement slurry hardens with the lapse of time inside a crack or the like, and has a composition similar to that of the surrounding skeleton concrete, and blocks the water leakage path 2.

[0004]

However, according to the conventional repair method, since the cement slurry has a relatively large particle diameter of the cement particles, the cement slurry can be injected into the water leaking portion by a narrow space such as a hair crack. There is a problem that it is not done. That is, when the cement slurry passes through such a narrow gap, clogging occurs due to the cement particles separated from water by the filtering action, and it becomes difficult to effectively stop the entire water leakage path. Also,
The equipment for injecting the cement slurry cannot be reused if it hardens while the cement slurry is adhered. Therefore, it is necessary to sufficiently perform cleaning after use.

[0005] In recent years, a permeable waterproofing agent (see, for example, Japanese Patent Publication No. 7-96672) has been developed as a concrete repairing agent in place of a conventional cement slurry or the like. That is, this type of permeable waterproofing agent is a composition mainly composed of a water-soluble alkali inorganic material including a surfactant, a water-insoluble powder, a calcium-aggregating water-soluble polymer, and the like. When infiltrated, it reacts with the calcium component in the concrete to form a water-repellent and water-insoluble substance, thereby blocking the water leakage path. Can be maintained.

However, the waterproof repair work using the permeable waterproofing agent usually employs a method of, for example, spraying water on the wall surface where water is leaking and then applying the permeable waterproofing agent to allow the water to penetrate into the leaked portion. Because there is no dedicated device for efficiently injecting water into the water leaking part, especially when it can be constructed only from the inside of the frame like an underground concrete structure, use a permeable waterproofing agent There has been a demand for a method of allowing the wire to efficiently penetrate by applying the sapphire to a line (crack joint) or a surface (junka).

According to the present invention, since the waterproof repair of a concrete structure is mainly performed by using the above-described permeable waterproofing agent, the waterproofing agent is efficiently applied to a water leakage path in the concrete skeleton layer from cracks in wall surfaces or junkers. The technical task was to make it possible to inject and penetrate well and to facilitate waterproofing repair work.

[0008]

The above technical problems can be effectively solved by the present invention. That is, the method for repairing a water leaking part of a concrete structure according to the present invention comprises attaching an elastic film body to a water leaking part on a wall surface of the concrete structure, fixing an outer periphery thereof in close contact with the wall surface, and A liquid permeable waterproofing agent is injected into an injection space defined between the wall and the wall surface to swell and deform the elastic membrane, and the contractible force of the elastic membrane causes the permeable waterproofing agent to apply the permeable waterproofing agent to the concrete frame layer. To penetrate the water leakage path inside.

Further, the present invention also provides a repair device for realizing the above repair method. That is, the repair device for a water leaking part of a concrete structure according to the present invention includes an elastic film body made of an elastomer and capable of swelling and deforming, a frame member for holding the outer periphery of the elastic film body, and a water leaking part on the wall surface of the concrete structure. A fixing mechanism for fixing the frame member in a close contact state, and an injection connector for injecting a liquid permeable waterproof agent into an injection space defined between the elastic film body and the wall surface.

As described above, the permeable waterproofing agent refers to a material which reacts with calcium or the like in concrete to generate a water-stopping substance by infiltrating into narrow voids or hair cracks. Say.

According to the method of the present invention, first, an elastic membrane is attached to a water leaking portion of a wall surface of a concrete structure, and the outer periphery thereof is fixed to the wall surface in close contact. This fixing is performed by a method in which a frame member holding the outer periphery of the elastic film body is tightly connected to the wall surface via a fixing mechanism. next,
A required amount of a permeable waterproofing agent in the form of a solution or a suspension is injected into the injection space defined between the elastic membrane and the wall surface by a pump or the like via an injection connector. The elastic membrane that undergoes swelling deformation accompanying this pressurizes the osmotic waterproofing agent in the injection space by a restoring force against deformation and, if necessary, by artificial pressurization. It penetrates smoothly and efficiently from a water leaking part such as a crack or a jungle facing the pouring space into a narrow space serving as a water leaking path inside the concrete skeleton layer, and exhibits a waterproof effect with time.

[0012]

1 and 2 show a preferred embodiment of a device for repairing a water leaking part of a concrete structure according to the present invention, which is attached to a wall surface of a concrete structure. Is a concrete skeleton layer, 2 is a penetrating crack generated in the concrete skeleton layer 1, and 3 is a position where the crack 2 is exposed at a wall of the concrete skeleton layer 1 (hereinafter referred to as a concrete wall) 1a, that is, is located at a water leaking portion. Repair equipment. This repair device 3 is made of an elastomer, for example, 200 mm long,
A substantially rectangular elastic film body 31 having a width of about 500 mm and a frame member 32 holding an outer peripheral portion of the elastic film body 31
A pair of fixing mechanisms 33 for fixing the frame member 32 to the concrete wall surface 1a in a close contact state, and an injection connector 3 comprising a pipe joint attached to the center of the elastic film body 31.
4 is provided.

The frame member 32 includes a pair of frame plates 321 and 322 made of a steel plate or the like, a large number of screw members 323 for connecting the frame plates 321 and 322 in the thickness direction, and a frame plate on the concrete wall surface 1a side. 322 and a packing 324 made of an elastomer attached to the entire periphery of the surface facing the concrete wall surface 1a. Elastic membrane 3
The outer peripheral portion 1 is tightly held by tightly connecting the pair of frame plates 321 and 322 arranged on both sides in the thickness direction with the screw members 323 arranged at predetermined intervals in the circumferential direction.

The fixing mechanism 33 is made of angle steel having a length of, for example, about 300 mm, which is appropriately longer than the vertical dimension of the frame member 32, and has elongated holes 331 extending in the longitudinal direction near both ends thereof.
a holding member 331 in which a is opened, and each of the long holes 331
And an anchor bolt 332 having one end fixed to the concrete wall surface 1a and a nut 333 screwed thereto. That is, the fixing mechanism 33
The nut 333 screwed to the anchor bolt 332 is tightened, and the vicinity of both ends of the frame member 32 is pressed and fixed to the concrete wall surface 1a by the pressing member 331.

As the anchor bolt 332, a hole can be used by drilling a hole in the concrete wall surface 1a with a drill or the like and inserting and locking the hole. For example, as shown in FIG. It is also possible to use the separator 11 used and remaining in the concrete skeleton layer 1, and attach it to the tip screw portion 11 a via a nut 12. Also, a long hole 331a of the holding member 331 is provided.
This allows a difference in the fixing position of each anchor bolt 332 in the longitudinal direction of the pressing member 331 to some extent.

That is, in order to mount the repair device 3 according to this embodiment, first, the frame member 32 integrally holding the elastic film body 31 is attached to the concrete wall 1a so as to cover a part or the whole of the crack 2 in the concrete wall 1a. An anchor bolt 332 is attached to each of the existing separators 11 located outside and near both ends in the longitudinal direction, or holes (4 places in total) drilled in the concrete wall surface 1a as necessary.
Next, the respective elongated holes 331a of the pair of holding members 331 are passed through the respective anchor bolts 332, and the holding members 3
31 is applied to the frame member 32 and the nut 333 is tightened. As a result, the packing 324 inside the frame member 32 is brought into close contact with the concrete wall surface 1a with an appropriate surface pressure, and the mounting state shown in FIGS. 1 and 2 is established, and the elastic film body 31 and the concrete wall surface 1a are connected. In between, a sealed injection space 35 is defined.

The end of the flexible tube 4 is inserted into the injection connector 34 attached to the elastic film body 31 and fastened with a metal band 41 or the like. Waterproofing agent S
And a pressure gauge 6 for measuring the hydraulic pressure of the permeable waterproofing agent S are connected. Also,
A cock 7 is provided in the middle of the waterproof agent supply path by the flexible tube 4.

As the permeable waterproofing agent S, for example, a flow sealer (registered trademark; manufactured by Nippon Kayaku Co., Ltd.) is suitable, and as described above, reacts with a calcium component or a base in concrete. To produce a water-repellent, water-insoluble, water-stopping substance.

After the above-described mounting operation is completed, the hand-operated pump 5 is manually operated to apply the permeable waterproof agent S through the flexible tube 4 to the elastic membrane 31.
Filling space 3 defined between the concrete and the concrete wall 1a
5 The outer periphery of the elastic film body 31 and each of the frame plates 321 and 322 of the frame member 32 are tightly joined to each other by the tightening force of the screw member 323, and a packing 324 is provided between the frame plate 322 and the concrete wall surface 1a. Since it is sealed, leakage of the permeable waterproof agent S supplied to the injection space 35 is effectively prevented.

The permeable waterproofing agent S supplied to the injection space 35 by the manual pump 5 swells and deforms the elastic membrane 31 so as to increase the volume of the injection space 35 as shown in FIG. For this reason, the osmotic waterproofing agent S in the injection space 35 is pressurized by the return force of the elastic film body 31, and the pressure increases with an increase in the injection amount. Since the pressure is measured by the pressure gauge 6, when the pressure rises to a predetermined value, the supply by the hand pump 5 is stopped, and the waterproof agent supply path by the flexible tube 4 is closed by the cock 7.

The permeable waterproofing agent S in the pressurized injection space 35 permeates into all the cracks 2 exposed in the region surrounded by the frame member 32. The permeable waterproofing agent S in the form of an aqueous solution or a suspension has a low viscosity, so that the permeable waterproofing agent S is not clogged even if the voids formed by the cracks 2 are extremely narrow, and the concrete surface is not clogged. Even if it is difficult to penetrate the surface simply by applying the liquid to the surface, the elastic film 31 pressurizes smoothly and penetrates to a deeper portion and is diffused widely.

The permeable waterproof agent S that has penetrated into the crack 2 is
The water-insoluble and water-repellent extremely stable gel-like substance S 'reacts with calcium ions and bases on the crack surface over time.
Generate The substance S 'is firmly adhered to the concrete, closes a gap serving as a water leakage path by the crack 2, and exhibits an excellent water stopping effect. After injection of the permeable waterproofing agent S, the time required for the water stopping effect to be exhibited by such a reaction is about 2 hours.

The permeable waterproofing agent S maintains a stable liquid state in a portion that is not in contact with concrete and does not generate a coagulated substance S ′. After a sufficient time has elapsed, the cock 7 is opened, and the permeable waterproof agent S remaining in the injection space 35 can be easily recovered by the return force of the elastic membrane 31. After the collection, the nut 33 in the fixing mechanism 33 is
3, the frame member 32 is released.
Is removed from the concrete wall surface 1a together with the elastic film body 31, and the holding member 331 and the anchor bolt 332 are also removed.

The permeable waterproofing agent S adheres to the inner surfaces of the elastic membrane 1 and the flexible tube 4 and the internal mechanism of the hand pump 5 and hardens like a concrete repair agent made of cement slurry or the like. There is no. Therefore, there is no need to carefully clean or disassemble these after the work is completed, and it is not necessary to particularly clean the portion of the concrete wall 1a that has been in contact with the area surrounded by the frame member 32 of the repairing device 3, The collected permeable waterproofing agent S can be diverted to the next repair location and can be used any number of times.

In the above embodiment, the frame members 321 and 322 of the frame member 32 and the holding member 331 of the fixing mechanism 33 have been described as being made of metal such as steel. For example, it may be made of a hard plastic or the like as long as it has a mechanical strength that can withstand the reaction force caused by the injection pressure.

FIG. 5 exemplifies a case where a leaked portion on a concrete wall surface other than a flat wall surface is repaired. First, FIG. 5 (A) shows a situation in which a groundwater leakage point existing from the vertical wall surface 1b of the underground concrete structure to the inclined wall surface 1c of the haunch portion is being repaired, for example. The holding members 321 and 322 and the holding member 331 of the fixing mechanism 33 are formed in advance in a bent shape corresponding to the angle between the vertical wall surface 1b and the inclined wall surface 1c. It has a similar configuration. In this case, as described above, the frame plate 32
If the first member 322 and the holding member 331 are made of hard plastic, they have a certain degree of flexibility.
The angle variation can be coped with, and the bent shape compensates for the mechanical strength against the injection pressure of the permeable waterproofing agent.

FIG. 5 (B) shows a situation in which a leaked portion of the concrete skeleton layer 1 having a cylindrical shape is repaired like a secondary lining surface in a shield tunnel. In this case, the frame plates 321 and 322 of the frame member 32 and the pressing member 331 of the fixing mechanism 33 are formed in advance in a curved shape corresponding to the cylindrical wall surface 1d. If the member 331 is made of a hard plastic, depending on the curvature of the wall surface 1d, the member 331 can be attached in a state of being curved by the flexibility of the hard plastic without being particularly formed into a curved shape. The mechanical strength against the injection pressure of the permeable waterproofing agent is compensated.

The present invention is, of course, not limited to the illustrated embodiment.
Assuming that the frame member 32 is composed of only nuts,
It is also possible to adopt a configuration in which the nut is directly fixed to the concrete wall surface. The shape and size of the elastic film and the frame member may be appropriately determined according to the wall shape to be repaired.

[0029]

According to the present invention, the permeable waterproofing agent is applied to the deeper part of the water leaking portion existing on the concrete wall corresponding to the pouring space defined between the wall of the concrete structure and the elastic membrane. The water can be efficiently repaired because it can be penetrated into the water. In repairing a portion that can be constructed only from the inside of the skeleton, such as an underground concrete structure or a tunnel, the permeable waterproof agent can be smoothly injected. Moreover,
Excellent effects such as easy installation and removal of the device and re-use of the device are realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a repair device according to the present invention in a state where the repair device is attached to a wall surface of a concrete structure.

FIG. 2 is a schematic configuration explanatory view showing a state in which the repair device of the embodiment is attached to a wall surface of a concrete structure together with a longitudinal section.

FIG. 3 is a partial cross-sectional view showing a state in which the repair device of the embodiment is mounted using an existing separator.

FIG. 4 is a longitudinal sectional view showing a state in which a permeable waterproof agent is permeated into cracks in a concrete skeleton layer using the repairing apparatus of the embodiment.

FIG. 5 shows another embodiment of the present invention, in which (A) shows a state in which the repair device is attached to the wall surface of the haunch part, and (B) is an explanatory view showing a state in which the repair device is attached to the cylindrical wall surface. is there.

FIG. 6 is an explanatory view showing a process of repairing a water leaking portion of a concrete wall surface according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete skeleton layer 1a-1d Wall surface 2 Crack (water leakage path) 3 Repair device 31 Elastic membrane 32 Frame member 33 Fixing mechanism 34 Injection connector 35 Injection space 5 Hand pump S Permeable waterproofing agent

Claims (2)

[Claims] 1. An elastic membrane (31) is attached to a water leaking portion of a wall of a concrete structure, and its outer periphery is fixed to the wall in a tight state, and between the elastic membrane (31) and the wall. A liquid permeable waterproofing agent (S) is pressurized and injected into the injection space (35) defined in the above, so that the elastic membrane (31) swells and deforms. A method for repairing a leaked portion of a concrete structure, characterized by infiltrating the permeable waterproofing agent (S) into a water leak path in the concrete skeleton layer (1). 2. An elastic film body (31) made of an elastomer and capable of expanding and deforming, and a frame member (32) for holding an outer periphery of the elastic film body (31).
And the frame member (3)
A liquid permeable waterproofing agent (S) is injected into an injection space (35) defined between the elastic film body (31) and the wall surface, and a fixing mechanism (33) for fixing 2) in close contact. And an injection connector (34) for repairing a water leakage part of a concrete structure.