JPH0791906B2 - Leakage and water stop method for concrete structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping leakage of water from a concrete structure, particularly cracks generated in the concrete structure and water leaking from a joint portion of the concrete structure.

[0002]

2. Description of the Related Art Conventionally, as a construction method for stopping leakage of water generated in a concrete structure, the concrete surface is cut into a V shape along the leaking cracks or joints,
The cut portion should be filled with water-stopping mortar, or a leaking crack or a spouting portion should be directly provided with an injection hole, and a water-stopping agent should be press-fit into the injection hole, or a leaking crack or spouting In some cases, a pressurizer was attached to the concrete surface of the joint to press-in a waterproofing agent.

[0003]

However, the above-mentioned conventional construction method is a coping method of blocking the leak outlet of the crack and the splicing portion, and is a measure to fundamentally cut off the water intrusion portion or the route. Therefore, secondary water leakage often occurred from the closed cracks, the splice joints, other cracks in the vicinity thereof and the splice joints on the extension.

Further, in the above-mentioned conventional method for directly making an injection hole in a crack, it is impossible to always match the angle of the injection hole with the angle of the crack generated inside the concrete structure. Moreover, the injection hole could not be precisely aimed at the location of the water leakage and the path (void) of the water leakage, and in the end, the injection hole could only be opened randomly.

Further, when the injection hole does not reach the unfilled part (void) of the concrete, there is no escape place for the water blocking agent that has been press-fitted, and the injection hole is damaged by the high pressure of the water blocking agent. There were also many.

Furthermore, when a crack or a joint has a large opening on the concrete surface and a high pressure is applied to the water blocking agent, the water blocking agent is ejected from the immediate side of the injection hole because the concrete surface is weak. However, it was impossible to perform stable press-fitting because the waterproofing agent did not reach the deep part of the concrete structure.

According to the observation of the present inventor, when the concrete structure is destroyed, in many cases, voids are confirmed around the reinforcing bars. The present inventor considers that this void serves as a water leakage path, and a water blocking agent is directly press-fitted into the void around the reinforcing bar to block the water intrusion part and the path, thereby preventing water leakage. It is an object of the present invention to provide a water leakage stoppage method for a concrete structure, which is capable of fundamentally solving the cause and solving the above conventional problems.

[0008]

In order to solve the above-mentioned problems, the method for waterproofing and stopping water leakage of a concrete structure according to the present invention is based on the fact that the cracks generated in the concrete structure and the reinforcing bar positions around the joints are set to the reinforcing bar position. It is characterized in that an inspection hole is opened toward the reinforcing bar by investigating with a detector, and the water blocking agent is pressed into the space around the reinforcing bar from the injection hole. In addition, a guide pipe having an outer diameter substantially the same as the inner diameter of the injection hole and having a length substantially the same as the distance from the concrete surface to the reinforcing bar is driven into the injection hole, and the waterproofing agent is press-fitted. And

[0009]

[Function] Using a reinforcing bar detector, the position of the reinforcing bar around the cracks and joints of the concrete structure is checked, and the waterproofing agent is directly pressed into the void around the reinforcing bar, blocking the water path. As a result, secondary water leakage can be prevented, and since there is an escape area for the pressure of the water blocking agent, damage to the injection hole can be prevented. Furthermore, since the press-fitting water-stopping agent continues press-fitting until it leaks from the leaking cracks or spouts, it is possible to confirm that the location of the leaking water has been completely stopped. Moreover, in order to cut off the leakage path by injecting a waterproofing agent into the water path in the deep part of the concrete structure by the guide pipe, the water will move to the non-leakage site and secondary leakage will occur. Can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment for stopping leakage of water from cracks, which is a concrete structure in which reinforcing bars are arranged inside. The concrete structure has cracks reaching the internal reinforcing bars.

When water leakage from the cracks is to be stopped, a reinforcing bar detector (not shown) is used to arrange the reinforcing bars around the cracks and the covering thickness (from the surface of the concrete structure). The distance to the nearest reinforcing bar) is investigated and the reinforcing bar position is marked on the surface of the concrete structure. The cross section of the rebar is determined from the marked bar arrangement position and the covering thickness, and an injection hole is formed toward the cross section of the rebar.

Next, as shown in FIG. 3, a guide pipe is driven into the injection hole. The length of this guide pipe is the same as the covering thickness of the reinforcing bar. The outer diameter of the guide pipe is the same as the inner diameter of the injection hole.

Subsequently, the injection nozzle is inserted into the injection port of the guide pipe, and the water blocking agent is press-fitted by the press-fitting pump (not shown). The water blocking agent that has been press-fitted is filled in the injection hole and the void.

When the water-stopping agent is further pressed in, if the concrete structure has an outer wall, the water-stopper will be ejected to the outer wall or to the crack on the inner wall.
By confirming this, it is possible to confirm the blockage of the water path (void). If the concrete structure is in the ground
When the leaked water is cured, the water blocking agent is press-fitted into the deep portion of the concrete structure by the guide pipe, so that the water path (void) is inevitably blocked.

FIG. 4 shows an embodiment in which water leakage from the jointing portion of the concrete structure is stopped. Similar to the above-mentioned embodiment, a reinforcing bar finder is used to form a joint where water is leaking. Survey the reinforcement position and covering thickness of the rebar around the
The surface is marked, an injection hole is opened toward the reinforcing bar around the splice portion, a guide pipe is driven into the injection hole, and a water blocking agent is press-fitted by an injection nozzle.

[0016]

[Effects of the Invention] 1) A crack generated in a concrete structure or a reinforcing bar locating position around a joint is investigated by a reinforcing bar detector, an injection hole is opened toward the reinforcing bar, and the reinforcing bar is inserted from the injection hole. Since the water-stopping agent is press-fitted into the space around the and the pressure-stopping agent is continued until the water-stopping agent is jetted from the cracks or joints, the water-blocking route or the intrusion part is blocked by the water-stopping agent, and the secondary water leak Can be prevented. 2) Since the water blocking agent is pressed into the concrete pipe, the water blocking agent with a high pressure can be reliably pressed into the deep portion of the concrete structure, and the pressure destruction on the concrete surface can be prevented. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water leak part in a crack generated in a concrete structure.

FIG. 2 is a side view of AA of FIG.

FIG. 3 is an explanatory view of driving a guide pipe into an injection hole and press-fitting a water blocking agent.

FIG. 4 is a cross-sectional view of a water leak part in a jointing part of a concrete structure.

[Explanation of symbols] Concrete structure Reinforcing bar Crack Injection hole Marking Void Injection nozzle Guide pipe Splice

Claims (2)

[Claims] 1. A crack generated in a concrete structure or a reinforcing bar arranging position around a joint is investigated by a reinforcing bar detector, an injection hole is opened toward the reinforcing bar, and a periphery of the reinforcing bar is formed from the injection hole. A water-stopping method for water leakage of concrete structures, characterized in that a water-stopping agent is press-fitted into the voids. 2. A guide pipe having an outer diameter substantially the same as the inner diameter of the injection hole and a length substantially the same as the distance from the concrete surface to the reinforcing bar is driven into the injection hole to press-fit the water blocking agent. The water leakage stoppage method for a concrete structure according to claim 1, wherein.