JPH05156820A - Repair construction for concrete structure and repairing device - Google Patents

Abstract

PURPOSE:To penetrate repairing agent for concrete structure or the like (for example a mixture of hydrophilic single liquid type polyurethane prepolymer and water glass) up to the deep positions of large and small cracks or the like in a concrete structure by the foaming pressure of the repairing agent, and repairing concrete or the like of wide area by only one work. CONSTITUTION:A pressure contact plate 6 provided wish a sealing material at the perimeter is applied to the surface 4 of a concrete structure 1, and repairing agent such as a mixture of hydrophilic monoliquid type polyurethane premolymer and water glass is pressed into between the surfaces of the pressure contact plate 6 and the concrete structure 1. The concrete or the like with a crack is repaired, left as it is until pressurizing action has been generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method and a repairing device for repairing large or small cracks in the surface layer of structures made of concrete, mortar or the like, or pinholes.

[0002]

[Background Art] Concrete structures such as factories, buildings, houses, and cracks on the surface layer of concrete structures such as rock walls on the side of roads, etc. A method of applying a repairing agent, waterproofing agent, etc., and a method of press-fitting / filling a repairing agent such as a tube into a crack in a concrete structure are also well known. Liquid epoxy resins are often used.

However, conventionally, when filling the above-mentioned repair agent, depending on the condition of the concrete surface,
For example, in order to repair a small number of simple pinholes, the above-mentioned repair agent may be applied, but in order to repair a wide area crack, etc., a part of the crack is crossed and an opening is provided, After sealing the surface with adhesive tape etc. along the crack,
The method of injecting the repair agent by pressing the mouth of a hose or the like connected to a pumping mechanism such as a pump from the opening is adopted, and the work is very complicated, and the repair agent is pressure-fed. Large-scale equipment such as a high-pressure pump was required. Further, for minute cracks on the concrete surface, it is troublesome to apply the above method one by one, and there is no effective and efficient repair method in the conventional method.

[0004]

Therefore, the present invention has a problem in the above-mentioned conventional method, that is, a small number of simple pinholes of concrete structures can be repaired by applying a repairing agent, but repairing a wide range of cracks and the like. The construction method is intended to solve the problems that complicated work and large-scale equipment are required, and that there is no appropriate repair construction method for many fine cracks.

[0005]

That is, the present invention is as follows.
(1) A pressure contact plate having a sealing material around it is applied to the surface of the concrete structure, and a repair agent is pressed into the gap between the pressure contact plate and the surface of the concrete structure. , Repair method for concrete structures,
(2) A pressure contact plate having a sealing material around it is provided with a passage for penetrating the repair agent from its rear surface to the surface, and a concrete structure constructed by interposing a check valve in the passage. It is a repair device. As the sealing material in the present invention, various synthetic rubbers having chemical resistance plasticity and resilience, foams such as urethane foam, or foams of a composition composed of urethane, asphalt and rubber are preferable, and repair by press fitting is preferable. As the agent, a mixture of a hydrophilic one-pack type polyurethane prepolymer and water glass is preferable. Further, when the repair agent is press-fitted, a passage penetrating from the back surface of the press-contact plate to the surface through the check valve,
After the repair agent is press-fitted from the back surface side to the front surface side of the pressure contact plate, it is preferable to stop the press-fitting and maintain this state for a while. This makes it possible to repair a wide area from pinholes and deep cracks to deep cracks in a single operation, and the pressure-feeding device can be easily used without using a high-pressure pressure-feeding pump. It can be implemented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 is a conceptual side view showing a state in which the present invention is being carried out. The concrete structure 1 has fine cracks 2, 2 '... and large cracks 3, 3'. A preparatory act in the present invention is to apply a pressure contact plate 6 having a sealing material 5 around the surface 4 of such a concrete structure.

The sealing material 5 is a member for preventing the repairing agent, which will be described later, from leaking out to the periphery of the pressure contact plate 6, and is made of various synthetic rubbers having chemical resistance plasticity and resilience and foaming urethane foam. A body (sponge) or a foam of a composition composed of urethane, asphalt and rubber is used. In this example, an elastic sealing material "Compliband S" (trade name: manufactured by Nitto Bo Ltd.) obtained by integrally foaming urethane foam, special asphalt, and a rubber composition was used. The Compliband S has excellent restorability even at low temperature, and is non-tacky, but exhibits appropriate tackiness, and the shape is restored regardless of how it is deformed, and heat resistance and cold resistance (0 To 80 ° C.) and has good weather resistance. Such an elastic sealing material is one that deforms and seals following the irregularities on the surface of concrete structures, and has such strength that it can withstand the high pressure due to the expansion of the repair agent described below, and the surface of the pressure contact plate 6 A thickness of about 6 mm is attached to the periphery of, and the thickness is compressed to about 5 mm by the later-described pressure contact with the surface of concrete structures.

The pressure contact plate 6 is designed to withstand the pressure (8 to 10 kg / cm 2) due to the expansion of the repair agent, which will be described later.
It is made of a wood board, a metal board, a synthetic resin board, or the like, and a passage for a repair agent described later is provided in a main portion.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1. As shown in the figure, the main part of the pressure contact plate 6 is for supplying a repair agent penetrating from the surface (the side in contact with the concrete surface) to the back surface. A passage 7 is provided, and a hose 8 is attached to the rear surface of the passage 7.
The structure is such that it is pressure-fed to the surface of the press-contact plate 6 through.

A check valve 9 is provided in the passage 7 so that the repairing agent press-fitted from the hose 8 side to the surface side of the pressure contact plate 6 through the passage 7 is the check valve 9. Although passing, the repair agent already press-fitted on the front surface side of the pressure contact plate 6 does not flow back to the back surface side of the pressure contact plate 6 by the action of the check valve 9 even if the press-fitting of the repair agent is stopped. Is becoming

However, the check valve 9 shown in the drawings is a conceptual diagram of a ball check valve, but the check valve is not limited to this, and a lift check valve, a swing check valve, and a stop check valve are also available. It goes without saying that any one of various check valves may be used as appropriate.

In the embodiment shown in the figure, an escape hole 14 is provided separately from the repair agent passage 7. The escape hole 14 is an escape hole for partially escaping the gas or the like when the pressure of carbon dioxide gas or the like generated by the chemical reaction of the repair agent described later increases more than necessary. Further, it is desirable to apply a release agent made of a silicon compound or the like to the surfaces of the pressure contact plate 6 and the sealing material 5 so that the repair agent described later does not adhere thereto.

After the pressure contact plate 6 is pressed against the surface 4 of the concrete structure as described above, a repairing agent "NL paste" (trade name: manufactured by Takeda Pharmaceutical Co., Ltd.) composed of a hydrophilic one-component polyurethane prepolymer is used. The pressure contact plate 6 is press-fitted between the surface of the pressure contact plate 6 and the surface 4 of the concrete structure 1, and according to the embodiment shown in FIG. 1, the pressure contact plate 6 is equipped with a pumping device 10 such as a pump. It is attached to a frame 12 provided at one end of a dolly 11, and the dolly 11 is brought into pressure contact with the surface 4 of the concrete structure 1 by a power (not shown), and after the pressure contact, the stopper 13 maintains the pressure contact state. deep.

In the press-fitting operation of the repair agent in this embodiment, the repair agent is pressed by the pump 10 including the pump and the like through the hose 8, the check valve 9 and the passage 7 of the repair agent to the surface 4 of the concrete structure. It is performed by press-fitting between the press-contact plate 6.

As will be described later, it is not necessary to press-fit the repairing agent by using such a high pressure, and therefore the pumping device 10 composed of a pump or the like does not necessarily need to use special power, and is small in scale. If it is of the above type, it may be manually pushed in by a cylindrical hand pump or the like.

Although the present invention can be carried out by using any known repairing agent as the above-mentioned repairing agent, a mixture of a hydrophilic one-pack type polyurethane prepolymer and water glass is used as the repairing agent. Is also preferable.

When a mixture of the hydrophilic one-pack type polyurethane prepolymer and water glass is pressed in as a repairing agent as described above, the hydrophilic one-pack type polyurethane prepolymer reacts with water to expand as described below. However, since it is polymerized and hardened, the above-mentioned repair agent is press-fitted and filled not only to the fine cracks 2 and 2'of the concrete structure but also to the deep cracks 3 and 3 ', so that the above-mentioned cracks inside the concrete structure, etc. It produces the effect of repair.

When the hydrophilic one-pack type polyurethane prepolymer is brought into contact with water, it rapidly reacts with it to generate carbon dioxide gas and foam, and at the same time, it undergoes cross-linking polymerization and cures. A reaction product obtained by reacting a polyol having a terminal group with an isocyanate group, such as a copolymer obtained by polymerizing ethylene oxide and propylene oxide with ethylene glycol, and a reaction with tolylene diisocyanate. It is a thing.

The above-mentioned water glass is known as an inorganic adhesive and is an alkali silicate or an aqueous solution containing it as a main component. The alkali is mainly sodium, but also potassium. As a commercially available water glass, JIS
1408 stipulated “sodium silicate: nNa ₂ O · mSi
O ₂ ”, and there are Nos. 1, 2, 3, and 4. 1-4
No. 3 is a viscous liquid, so-called water glass, and its composition is, for example, No. 3 has SiO ₂ of 28 to 30.
%, Na ₂ O is 9 to 10%, and the balance is water.
Na ₂ O: SiO ₂ (molar ratio) = 1: 3.05.

In the present invention, the weight ratio of the mixture of the hydrophilic one-component polyurethane prepolymer and the water glass aqueous solution is 1: 1 to 6 (however, the water glass aqueous solution is calculated according to JIS No. 3 equivalent). Is preferred, and it is also preferred that the mixture contains a surfactant.

When the weight ratio of the mixture of the hydrophilic one-pack type polyurethane prepolymer used as the repair agent of the present invention and the water glass aqueous solution is lower than 1: 1 to 6, the hydrophilic one-pack type polyurethane prepolymer is If the amount of water required for the reaction cannot be secured, and if it exceeds the range, the reaction between the hydrophilic one-pack type polyurethane prepolymer and water glass starts immediately after stirring, and sufficient pot life cannot be obtained. Become,
Not very good.

As described above, the concrete structure 1
The press-contact plate 6 is formed so that the thickness between the surface 4 and the press-contact plate 6 is about 5 mm, that is, the thickness of the sealing material 5 provided around the press-contact plate 6 is about 5 mm. 12
When pressure is applied by the pressure, the gap between the surface 4 of the concrete structure 1 and the pressure plate 6 becomes about 0.5 mm. Therefore, the hydrophilic one-pack type polyurethane prepolymer as described above and the water are added to the extent that the gap is filled. Press in the mixture with the glass.

At this point, the press-fitting operation of the above-mentioned repair agent is stopped, and the time is temporarily changed (depending on the mixing ratio of the hydrophilic polyurethane prepolymer used and water glass, the environmental temperature, etc., but about 20 minutes). Since the mixing ratio is adjusted to such an extent that the foaming / expansion is effective as the pressurizing action, after being left as it is,
The pressing plate 6 is separated from the concrete structure 1, and the pressing plate 6 is again attached to the surface 4 of another part of the concrete structure 1.
Then, the construction method of the present invention is repeated again.

At this time, the check valve 9 is pressure-contacted by the pressure generated by the above-mentioned foaming and expansion of the repair agent press-fitted between the surface 4 of the concrete structure 1 and the pressure-contact plate 6. It prevents backflow to the back side of the plate 6, and serves to maintain the pressure for a while.

Since the present invention has the above-mentioned steps, the pressure-feeding device 1 comprising a pump or the like used in the present invention.
In No. 0, the hydrophilic one-pack type polyurethane prepolymer and water glass were mixed while being separately weighed by a configuration such as combining a metering pump, and immediately after mixing, pressure feeding was performed, and at the time when the pressure feeding was stopped. It is preferable that the repair agent after mixing is configured and operated so as not to remain in the pressure-feeding device 10 composed of a pump or the like.

When the mixture of the hydrophilic one-pack type polyurethane prepolymer of the present invention and water glass is press-fitted between the surface of the concrete structure and the surface of the press-contact plate, the following action occurs. That is, the hydrophilic one-pack type polyurethane prepolymer reacts with water in water glass to generate carbon dioxide gas as described above and foams, and at the same time, is crosslinked and cured to be hardened, while the pressure of the carbon dioxide gas (8 -10kg / cm
_{By 2} ), the water glass becomes an inorganic adhesive and is press-fitted / filled into the minute cracks 2, 2 '... and the large cracks 3, 3' ... of the concrete structure to be hardened, and the inner surface of the crack or the like is hardened. To join.

FIG. 3 is an enlarged view similar to FIG. 2 showing the state after the repair according to the present invention, but as shown in FIG. 3, fine cracks 2, 2 '... and large cracks 3 in the concrete structure 1 are shown. , 3 '..., the cracks are uniformly filled with the repair agent 15, 15 ... According to the present invention, and the surface 4 is also applied and hardened. , The above-mentioned cracks will be closed and the inner surface of the crack will be joined, and the deterioration of the durability of the concrete structure caused by the above-mentioned cracks will be restored, and it will adhere to the surface 4 of the concrete structure and harden. The repair agent 15 serves to waterproof the surface of the concrete structure 1.

Moreover, the repairing agent 1 filled between the large and small cracks 2, 2 '... and 3, 3' ... of the concrete structure 1
5, 15, that is, the mixture of the cured polyurethane cured product and the water glass cured product has elasticity and flexibility to some extent as compared with concrete.

[0029]

Since the present invention is a construction method in which a repairing agent is press-fitted between the surface of a concrete structure and a press-contacting plate, it is possible to repair a structure having a wide area evenly by a single operation.

When a mixture of a hydrophilic one-component polyurethane prepolymer and water glass is used as the repair agent, the hydrophilic one-component polyurethane pre-pressed between the pressure plate and the concrete structure surface is used. Since the polymer expands by generating carbon dioxide gas by the reaction with water, the expansion pressure causes the repairing agent of the present invention to be evenly pressed and filled deeply into large and small cracks of the concrete structure. , Because the inner surface such as the crack is joined,
All cracks of various sizes can be effectively repaired by a single press-fitting operation.

Moreover, even if the pressure-feeding device composed of a pump or the like is used for the press-fitting of the repairing agent, it only needs to press the repairing agent into the gap between the pressure-bonding plate and the concrete surface. The pressure at which the repair agent is press-fitted into cracks or the like of the concrete structure is obtained by the expansion due to the reaction between the one-component polyurethane prepolymer and water, so the pressure for press-fitting the repair agent is: It does not need to be so large, and therefore a pump for press-fitting does not require a high-pressure pump, so depending on the case, the manual work of a cylinder-type hand pump can be used in some cases, such as making it possible to make it in a small facility. The advantage of the invention.

Further, since the water glass retains both the hydrophilic one-pack type polyurethane prepolymer and the water glass after the polymerization and curing, the flexibility is higher than that of concrete.
In the concrete structure repaired by the present invention, since the soft material is present in the portion that was a crack before repair, there is also a secondary effect that vibrations and the like are absorbed by the soft material. Therefore, it can be expected that the concrete structure has high durability against vibration and the like.

Further, in the conventional method of chipping a cracked portion and filling a repairing agent into the cracked portion, the repaired portion has a color different from that of the other concrete surface. However, according to the present invention, since the repair agent is applied to the surface of the concrete structure as well, in the case of the above-described embodiment, the repair agent is applied to a thickness of about 0.5 mm. Eliminates the entire painting process

[Brief description of drawings]

FIG. 1 is a conceptual side view showing a state in which the present invention is being carried out.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged view similar to FIG. 2 after completing the repair according to the present invention.

[Explanation of symbols] 1 Concrete structure 2 Fine cracks 3 Large cracks 4 Surface of concrete structure 5 Sealant 6 Pressure contact plate 7 Repair agent passage 8 Hose 9 Check valve 10 Pumping equipment consisting of pumps 11 Truck 12 Frame Body 13 Stopper 14 Escape hole 15 Filled repair agent

Claims (5)

[Claims] 1. A surface of a concrete structure is covered with a pressure contact plate having a sealing material around it, and a repair agent is pressed into a gap between the pressure contact plate and the surface of the concrete structure. The method of repairing concrete structures. 2. The method for repairing concrete structures according to claim 1, wherein the repair agent to be press-fitted is a mixture of a hydrophilic one-pack type polyurethane prepolymer and water glass. 3. A pressurizing agent is press-fitted from the rear surface side to the front surface side of the press-connecting plate by a passage penetrating from the rear surface of the press-connecting plate to the surface via a check valve, and then the press-fitting is stopped, and this state is temporarily maintained 1 to 2, characterized in that
The method of repairing the concrete structures described. 4. The sealing material is made of an elastic material having good restoring property.
The method for repairing concrete structures according to any one of 1. 5. A press-contact plate having a sealing material around it,
A repairing device for concrete structures, which is provided with a passage for penetrating a repairing agent from the back surface to the surface and in which a check valve is interposed in the passage.