JP2000096726A - Method for preventing water leakage at concrete placing joint underground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water reakage from a concrete placing joint underground. SOLUTION: A pipe 3 with a plurality of through holes is arranged in advance before forms are erected and concrete is placed, at an earth-retaining wall 2 side of a concrete placing joint part 11 of an underground external wall 1. A hose 4 through which a cut-off agent can be injected into the pipe and underground water or the overflowing cut-off agent can be discharged is connected to the pipe 3. Then, concrete is placed in the concrete placing joint part 11 and the forms are removed. Thereafter, after a specified time interval, the cut-off agent is injected from the hose 4 by a hand pump 5 to fill the cut-off agent through the through holes in water leakage positions such as the concrete placing joints or cracks and to seal water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively preventing water from leaking from a concrete joint such as an underground outer wall.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing water leakage from a concrete splicing portion such as an underground outer wall, as shown in FIG. I have.

More specifically, a water blocking plate 7 is nailed to a horizontal sheet pile 81 provided on the inner surface side of the retaining wall 8 in a direction perpendicular to the concrete joint portion 6. Water stop plate 7
Is a spun seal with a plastic backing, ie a non-vulcanized butyl rubber sheet. The non-vulcanized butyl rubber sheet stops water by an adhesive effect on concrete that has not yet set.

[0004] Reinforcing bars 82 are provided in a direction perpendicular to the concrete joint portion 6.

[0005]

However, since the water stop plate is a thin plate made of the above-mentioned plastic, synthetic rubber, iron plate or the like, it is deformed by the impact when concrete is poured. And may be damaged. In such a case, the water stopping performance of the water stopping plate is deteriorated, and water leakage often occurs from the concrete joint.

Further, in the conventional method, since the water-stopping agent injection port is not formed in the joint portion of the concrete, the water-stopping agent cannot be injected into the water leakage portion, and the occurrence of water leakage is effectively prevented. I couldn't do that.

Therefore, the present invention provides a pipe having a plurality of through holes formed in a concrete splicing section underground, from which a water-stopping material is applied to a joint or crack or other water leaking point. An object of the present invention is to effectively prevent water leakage from a concrete joint underground by filling.

[0008]

In order to achieve the above object, a method for preventing water leakage from a concrete joint underground according to the present invention comprises a pipe having a plurality of through holes formed in a concrete joint underground. Is installed before concrete is placed and formwork is built. Then, a hose capable of injecting the waterproofing agent into the pipe and discharging the underground water and the overflowing waterproofing agent is connected to the pipe. Next, after placing concrete in the concrete joint and removing the formwork,
After a predetermined period, inject a waterproofing agent from the hose,
A water-stopping agent is filled from the through-hole of the pipe to a leaked portion such as the joint or crack.

[0009] Here, the water leakage location means all locations where water leakage occurs, such as a separator, in addition to the concrete splicing portion and cracks. With such a configuration, it is possible to effectively prevent the occurrence of water leakage from the concrete joint portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for preventing water leakage from a concrete joint underground according to the present invention will be described below with reference to the drawings.

[0011] The present invention roughly comprises pipe installation, concrete casting, injection of a waterproofing agent, discharge of overflowed waterproofing agent and groundwater.
Description will be made in this order. 1. Arrangement of pipes As shown in FIGS. 1 and 2, first, cylindrical pipes 3... With a predetermined interval are cast on the side of the retaining wall 2 of the concrete joint portion 11 of the underground outer wall 1. And it will be installed in advance before embedding the formwork. The interval at which the pipes 3 are provided may be widened or narrowed depending on the outflow condition of groundwater, but is generally 2,000 to 3,000 mm.
And

A plurality of through-holes 31 are formed in the pipe 3. From these through-holes, a water-stopping agent is injected into a leaking portion such as a concrete joint portion 11 or a crack (not shown). In addition, overflowing waterproofing agents and groundwater are received in pipes. A mesh 32 for civil engineering is wound around the outer circumference of the pipe 3, and a wire 33 is attached to the mesh. The tip of the wire 33 is connected to a reinforcing bar (not shown) embedded in the retaining wall 2, so that the pipe 3 is fixed to the retaining wall 2.

At the center of the pipe 3, one end of a hose 4 capable of injecting a water-stopping material into the pipe and discharging an overflowing water-stopping agent or groundwater is connected by a band (not shown). It is. As shown in FIG. 1, the hose 4 extends upward and then extends horizontally on the way, and its tip 41 is provided at an opening for injecting a waterproofing agent or discharging an overflowing waterproofing agent or groundwater. Has become.

The hose 4 is bound at two locations near the pipe 3 and near the opening at the tip end, and prevents groundwater from flowing out from the opening at the tip end. Note that the binding is removed when a waterproofing agent described later is injected. 2. Concrete casting Next, after casting concrete to form the underground outer wall 1 and before injecting the waterproofing agent, a V-shaped cut portion 12 is formed at the lower end of the inner surface of the underground outer wall, Waterproofing is performed by performing cement waterproofing. The cutout portion 12 also plays a role in preventing the waterproof liquid from protruding to the floor surface.

When the concrete is cast, the groundwater accumulated in the concrete splicing section 11 enters the pipe through the through hole 31 formed in the pipe 3 and passes through the hose 4 connected to the pipe. It overflows from the opening at the end of the hose. 3. Injection of waterproofing agent 2-3 months after concrete hardens, hose 4
The hose 5 attached to the hand pump 5
1 is connected. A water stopping agent (not shown) is contained in the hand pump 5. As the water stopping agent, a one-part curing type urethane water stopping agent is used.

Next, the hose 4 is untied, and the amount of groundwater flowing out of the hose tip opening is measured. Then, the hand pump 5 is operated to inject the same amount of the waterproof agent into the pipe 3 as the discharged groundwater. When injecting the waterproofing agent, observe the changes in the water leakage condition from the upper floor of the basement to the lower floor. Then, the waterproofing agent spouts from the through hole 31 of the pipe, and the concrete joint 1
Water leaking points such as 1 and cracks are filled with a waterproofing agent. The water stopping agent reacts with water in the concrete joint portion 11, the crack 13, or the like, foams and expands and hardens to form a sponge-like rubber film, thereby stopping water.

It should be noted that the water-stopping agent is injected by the hand pump 5 instead of all the pipes 3 arranged at a predetermined interval. You may do so. 4. Discharge of overflowing water stopping agent and groundwater When the water stopping agent is continuously injected by the hand pump 5, the water stopping agent fills the concrete joint portion 11 and cracks. Then, the overflowing water-stopping agent enters the pipe from the through hole 31 of the pipe 3 into which the water-stopping agent is not injected, which is provided at a predetermined interval. Then, through the hose 4 connected to the pipe 3, the waterproofing agent overflows from the opening 41 at the tip of the hose. When the water-stopping agent overflows, the injection of the water-stopping agent is stopped, and the distal end opening 41 of the hose is closed.

At this time, when the pressure water is large, the joint portion of the pressure plate in the spring bit may be left at the end, and this portion may be omitted in some cases. In the above-described embodiment, a plurality of pipes are arranged at predetermined intervals, but it is not always necessary to arrange a plurality of pipes, and a single continuous pipe may be arranged. In this case, by connecting a plurality of hoses at a predetermined interval to one pipe and injecting a waterproofing agent from some of the hoses, no other waterproofing agent is injected. Make sure that the water-blocking agent and groundwater overflow from the hose can be drained.

Further, in the above-described embodiment, the pipe is provided on the retaining wall side of the concrete splicing portion of the underground outer wall, but it is not always necessary to provide the pipe at this location. In addition, a pipe may be provided at any place where water leakage may occur, such as a slab or a vertical joint of a beam.

It is not always necessary to inject the water-stopping agent two to three months after the concrete has hardened, and the timing of injecting the water-stopping agent may be changed according to the situation. Also, the places where the hoses are bound need not necessarily be two places near the pipe and near the opening at the end. That is,
Any portion of the hose may be tied as long as the groundwater can be prevented from flowing out of the opening at the end of the hose.

[0021]

As described above, according to the present invention, a pipe capable of injecting a waterproofing agent is provided at a joint of concrete, and after the concrete is poured, the waterproofing agent is injected into the pipe to leak water. By filling the location with the water stopping agent, the occurrence of water leakage can be effectively prevented. In particular, the present invention is effective in an electric room, a machine room, a disaster prevention center, and the like, since the occurrence of water leakage causes serious trouble. Further, since the pipe also serves to release air when the concrete is poured, it is possible to prevent the accumulation of air at the joint portion of the concrete and to prevent the occurrence of jumper. Furthermore, since groundwater is drained from the opening at the tip of the hose when casting concrete, the water content of the concrete does not increase and the strength of the concrete can be ensured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the present invention.

FIG. 2 is a front view showing a pipe and a hose connected to each other.

FIG. 3 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 11 Concrete joint 3 Pipe 31 Through hole 4 Hose

Claims (1)

[Claims] 1. A pipe in which a plurality of through-holes are formed in a concrete splicing part in the basement beforehand is placed before concrete is poured and formwork is built. A hose capable of injecting a water stopping agent and discharging the water stopping agent that has flown into groundwater or overflow is connected, and concrete is poured into the concrete joint portion,
After the mold is released, the water-stopping agent is injected from the hose after a predetermined period of time, and the water-stopping agent is filled from the through-hole of the pipe to a leaking point such as the concrete joint or crack. A method for preventing water leakage from a concrete splice in an underground.