JP4125222B2 - Water stop method for concrete joints - Google Patents

Description

  The present invention relates to a water stopping method for a concrete joint.

Conventionally, a number of water-stopping methods using water-crosslinked polyurethane prepolymers, which are widely known as injection resins for injection that expand by reacting with water, have been implemented as countermeasures against water leakage at the joints of concrete members. Has been. Such a water stop construction method is, for example, as shown in Patent Document 1, a so-called hollow mesh hose comprising a mesh connecting the hollow portion and the outside as a resin injection hose on the joint surface of an existing concrete member on the outer peripheral surface. After placing a new concrete, and after curing for a required period, after pouring water into the joint from the inside of the hollow mesh hose, the water-crosslinked polyurethane prepolymer is injected into the joint It is.
Thereby, the water-crosslinking polyurethane prepolymer reacts with water and expands and expands to stop water.
Japanese Patent Laid-Open No. 9-4230 (see p2, FIG. 1)

However, when the method described above is applied to a thick-walled civil engineering structure, the concrete pouring pressure when casting new concrete is high, and the volume of the concrete is large. Since the hollow mesh hose enters into the hollow mesh hose and the hollow mesh hose is blocked by the hardened free part of the concrete that has entered, the water-crosslinked polyurethane prepolymer can be used even when there is a water leak in the vicinity of the hollow mesh hose. In some cases, the water-stopping effect cannot be fully exhibited due to injecting.
On the other hand, in order to prevent the clogging of the hollow mesh hose, a method is known in which the inside of the hollow mesh hose is washed with high-pressure water or the like several hours after the completion of placing new concrete and the next day to eliminate the concrete free matter. However, the work was complicated and increased the cost.

  In view of the above circumstances, the present invention is a concrete member that prevents the intrusion of a paste-like free part of a concrete in the resin injection hose that occurs when a new concrete is joined, and exhibits a high waterproof performance at the joint part of the concrete member. It aims at providing the water stop method of the joint part.

According to a first aspect of the present invention, there is provided a water stop method for a concrete joint, wherein the joint hole of the existing concrete member is covered with a high-pressure hose in which a plurality of communication holes communicating with the hollow portion and the outside are provided. A resin injection hose in which a coating material made of a cloth material fixed to the outer peripheral surface of the high-pressure hose is wound while an impervious performance is imparted by applying an acrylic adhesive to the outer peripheral surface of the high-pressure hose. A first step of installing an injection resin that reacts with water and an injection pipe for injecting water at one end of the resin injection hose, and an exhaust pipe for discharging the injection resin and water at the other end, A second step of casting and curing new concrete, and after the new concrete is cured, water is injected into the resin injection hose at a pressure capable of breaking the covering material, and the concrete member is formed from the broken portion of the covering material. of A third step of pouring water into the joint, and a fourth step of injecting the injection resin into the resin injection hose and leaching the injection resin from the fractured portion into the joint portion of the concrete member. It is a feature.

  According to a second aspect of the present invention, there is provided a method for water stoppage of a concrete joint portion according to the first aspect, wherein the resin injection pressure amount when the injection resin is press-fitted in the fourth step is determined. The third step is characterized in that it is made higher than the water injection pressure when water is injected.

According to the water-stopping method for the concrete joining portion according to claim 1, the coating material is used while preventing the invasion of the paste-like concrete free portion generated when the concrete is poured into the resin injection hose by the coating material. Since both the injection resin and water can be supplied uniformly to the gap generated in the joint part of the concrete member by breaking, the water and injection resin can be reliably supplied in the gap part generated in the joint part of the concrete member. Since the reaction occurs, it is possible to efficiently form a water stop structure with a simple configuration with respect to the gap generated in the joint portion of the concrete member.

  According to the water stopping method of the concrete joint portion according to claim 2, since the resin injection pressure amount when the injection resin is injected is made higher than the water injection pressure amount when the water is injected, It becomes possible to infiltrate the injecting resin more reliably into the gap portion formed in the joint portion of the concrete member.

  As described above, since the concrete free portion does not enter the hollow portion of the high-pressure hose, there is no need to clean the hollow portion of the high-pressure hose when filling the resin for injection. It is possible to greatly contribute to shortening.

The water stop method for the concrete joint of the present invention is shown in FIGS. The present invention provides a hollow portion and an outer portion on the outer peripheral surface when water is injected into a joint portion of a concrete member using an injection resin that reacts with water, for example, a water-crosslinking polyurethane prepolymer that expands and expands. A resin injection hose comprising a high-pressure hose provided with a plurality of communicating holes and a coating material wound around the communicating holes and impervious to water was disposed on the joint surface of the existing concrete member.
As a result, the high-pressure hose can be reliably filled with the resin for injection because it does not block due to the paste-like concrete that is generated when a new concrete is joined, and the resin for injection is leached into the joint part of the concrete member. In order to prevent this, the covering material that closes the communication hole is broken by water or the internal pressure of the resin for injection, so that the resin for injection is leached out to the joint part and a high water-stop structure is formed at the joint part of the concrete member. To form.

  As shown in FIG. 1B, the resin injection hose 1 is composed of a high-pressure hose 2 and a covering material 5. As shown in FIG. 1 (a), the high-pressure hose 2 is a hose having an inner diameter of about 6 to 10 mm that is generally used for high-pressure fluids, and synthesizes the inner and outer peripheral surfaces of a cylindrical core material 2a made of a cloth material. Even when a liquid is pressed into the hollow portion, the high pressure hose 2 itself is not deformed and does not break. And a shape can be hold | maintained, without a hose deform | transforming with the pressure from the outside.

In addition, a plurality of communication holes 9 having a hole diameter of, for example, about 1 to 3 mm are provided on the outer peripheral surface of the high-pressure hose 2 in the circumferential direction, and a predetermined distance of about 20 to 50 mm is also provided in the length direction. A plurality of communication holes 9 are provided. The communication hole 9 has a function of leaching the injecting resin 7 that reacts with water that is press-fitted into the hollow portion of the high-pressure hose 2. These communication holes 9 have a triple structure that does not break due to the internal pressure of the high-pressure hose 2 itself when the liquid is pressed into the hollow portion, as described above. Even when the resin 7 leaches out from the communication hole 9, its shape does not deform or break.
In the present embodiment, the communication holes 9 are staggered in the length direction of the high-pressure hose 2, but the arrangement is not necessarily limited to this. For example, the communication holes 9 are arranged in a parallel arrangement. May be.

  On the other hand, the covering material 5 is made of a cloth material having impermeability, and is arranged by winding the outer peripheral surface of the high-pressure hose 2 as shown in FIGS. In the present embodiment, the covering material 5 is made of a glass cloth made of glass fiber having excellent fire resistance against welding sparks, etc., and is molded to have a strength that breaks when an external pressure of a predetermined amount or more occurs in the out-of-plane direction. ing. In addition, an acrylic adhesive is applied to the back surface for the purpose of temporarily fixing the covering material 5 to the outer peripheral surface of the high-pressure hose 2 and imparting water impermeability to the covering material 5. ing.

  In the present embodiment, the covering material 5 is wound around the entire outer peripheral surface of the high-pressure hose 2, but this is not necessarily the case, and at least the communication hole 9 provided on the outer peripheral surface of the high-pressure hose 2 is covered. Moreover, it is good also as a structure wound partially.

As shown in FIGS. 3A and 3B, the resin injection hose 1 having the above-described configuration has an injection tube 3 for injecting an injection resin 7 and water 6 for reaction with the injection tube 3 at one end, and at the other end. A discharge pipe 4 for discharging the injection resin 7 and water 6 that has passed through the high-pressure hose 2 is provided.
These are press-fitted into the high-pressure hose 2 in the order of water 6 and injecting resin 7 through the injection tube 3. First, as shown in FIGS. 2 (a) and 3 (b), the high-pressure hose 2 is caused by water pressure. The covering material 5 covering the communication hole 9 is broken, and the water 6 is leached into the gap generated in the joint portion of the concrete member. Next, as shown in FIGS. 2 (b) and 3 (c), the fracture portion of the covering material 5 caused by the water pressure is completely opened by the internal pressure of the injection resin 7 due to the press-fitting of the injection resin 7. By forming a hole substantially the same shape as the communication hole 9, the injection resin 7 is leached into the gap formed in the joint portion of the concrete member, and reacts with the water 6 leached earlier to form a water stop structure. It is.

  Note that the breakage of the covering material 5 utilizing the water pressure and the injection of the injection resin 7 is not necessarily limited to the above-described embodiment. For example, if the covering material 5 is fixed to the high pressure hose 2 so that the end of the covering material 5 is positioned in the vicinity of the communication hole 9, the covering material 5 is attached to the high pressure hose 2 by water pressure as shown in FIG. Then, the covering material 5 is turned up by the injection of the injection resin 7, and the communication hole 9 of the high-pressure hose 2 is exposed and the injection resin 7 can be leached without being obstructed by the covering material 5.

  A water stop construction method for stopping the joint portion of the concrete member using the resin injection hose 1 described above will be described in detail below.

(First step)
As shown in FIGS. 2 (a) and 3 (a), the resin injection hose 1 is disposed on the joint surface 8 of the existing concrete member.
At this time, one end of the resin injection hose 1 is injected with the injection pipe 3 for injecting the injection resin 7 and water 6 for reaction with the high pressure hose 2, and the other end is injected with the high pressure hose 2. The discharge pipe 4 for discharging the resin 7 for water and water 6 for reacting with the resin 7 is attached.

(Second step)
Take over new concrete and cure and harden.
At this time, the paste-like concrete free portion generated at the time of joining the new concrete does not permeate the covering material 5 and therefore does not enter the hollow portion of the high-pressure hose 2 filled with the injection resin 7 later.

(Third step)
As shown in FIG. 3 (b), water 6 for reacting the injection resin 7 with the high-pressure hose 2 of the resin injection hose 1 is press-fitted through the injection pipe 3 to wet the joining surface.
At this time, water 6 is injected with a sufficient amount of water injection pressure to cause breakage of the covering material 5, thereby breaking the covering material 5 covering the communication hole of the high-pressure hose 2, and Water 6 is leached into the joint part of the concrete member. In addition, the penetration | invasion condition of the water 6 to the clearance gap which arose in the joint part of the concrete member is confirmed by observing the discharge amount of water in the said discharge pipe 4, and the leakage condition of the water from the joint part of a concrete member. .

(Fourth process)
As shown in FIG. 3C, the injection resin 7 is press-fitted into the high-pressure hose 2 of the resin injection hose 1 through the injection pipe 3.
At this time, when the injecting resin 7 is leached outward from the connecting hole 9 of the high-pressure hose 2, the broken portion generated by water pressure is completely opened so that the covering material 5 does not become an obstacle. The resin is injected with a sufficient amount of resin injection pressure to form a hole of the same shape. Thereby, a hole is generated in the covering material 5 covering the communication hole 9 of the high-pressure hose 2, and the injection resin 7 is leached from the hole into the joint portion of the concrete member.

  In addition, the resin 7 for injection advances the reaction while following the water 6, and one that expands and expands by the reaction is used. Therefore, as shown in FIG. 3 (b), since the gap of the joint portion of the concrete member is preliminarily wetted in the third step, it is efficiently injected into the gap generated in the joint portion of the concrete member. The resin 7 leaches out and expands or hardens, and a water stop structure can be reliably formed at the concrete joint.

  In the present embodiment, when the covering material 5 is broken at about 2 MPa, the water 6 has a water injection pressure amount of about 4 MPa, and the injection resin 7 has a resin injection pressure amount of about 8 MPa. By press-fitting into the resin injection hose 1, a necessary breakage occurred in the covering material 5, and a reliable water stop structure was formed with respect to the joint portion of the concrete member. The amount of pressure when the water 6 and the injection resin 7 are press-fitted into the resin injection hose 1 is the strength of the covering material 5, the cross-sectional diameter of the high-pressure hose 2, the number and diameter of the communication holes, the interval between the holes, the arrangement shape and the injection. It may be adjusted as appropriate according to the viscosity of the resin 7 for injection, but the resin injection pressure 7 is more reliably generated at the joint portion of the concrete member by making the resin injection pressure higher than the water injection pressure. Can be leached into the gap. The water injection pressure amount and the resin injection pressure amount may be applied up to about 100 MPa, and the resin injection hose 1 is configured to withstand this pressure.

  According to the water stopping method for the joint portion of the concrete member described above, the void portion generated in the joint portion of the concrete member while preventing the intrusion of the free concrete portion generated when the new concrete is joined into the resin injection hose 1. Since both the injection resin 7 and the water 6 can be supplied uniformly, the reaction between the water 6 and the injection resin 7 occurs surely in the gap formed in the joint portion of the concrete member. It becomes possible to efficiently form a water stop structure with a simple configuration with respect to the gap portion generated in the joint portion.

  Further, by increasing the resin injection pressure amount when the injection resin 7 is press-fitted compared to the water injection pressure amount when the water 6 is press-fitted, the gap generated in the joint portion of the concrete member is reduced. It becomes possible to infiltrate the resin for injection more reliably.

Furthermore, since the coating material 5 can suppress the phenomenon that the paste-like concrete free portion generated when the new concrete is spliced into the inside of the high-pressure hose 2 constituting the resin injection hose 1 can be suppressed. The high-pressure hose 2 is not blocked after joining. As a result, the high-pressure hose 2 can be reliably filled with the injecting resin 7 for stopping the joint portion of the concrete member.
Thus, since the concrete free portion does not enter the hollow portion of the high-pressure hose 2, it is not necessary to clean the hollow portion of the high-pressure hose 2 when filling the injection resin 7. It is possible to greatly contribute to the reduction and shortening of the construction period.

It is a figure which shows the outline of the resin injection | pouring hose which concerns on this invention. It is a figure which shows the fracture | rupture form of the coating | covering material which comprises the resin injection hose which concerns on this invention. It is a figure which shows the water stop method of the concrete joint part using the resin injection hose which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin injection hose 2 High-pressure hose 3 Injection pipe 4 Discharge pipe 5 Cover material 6 Water 7 Injection resin 8 Joint surface 9 Communication hole

Claims (2)

An acrylic adhesive is applied to the outer peripheral surface of the high-pressure hose so as to block the high-pressure hose provided with a plurality of communication holes communicating with the hollow portion and the outside on the joint surface of the existing concrete member. In addition to providing a water impervious performance, a resin injection hose wound with a covering material made of a cloth material fixed to the outer peripheral surface of the high pressure hose is disposed, and water reacts with one end of the resin injection hose. A first step of installing an injection resin for injecting water and an injection pipe for injecting water, and a discharge pipe for discharging the injection resin and water at the other end;
A second step of casting and curing new concrete;
A third step of injecting water into the resin injection hose at a pressure capable of breaking the covering material after the new concrete is hardened, and pouring water from the breaking portion of the covering material to the joint portion of the concrete member;
A method for water-stopping a concrete joint, characterized by comprising a fourth step of press-fitting an injection resin into the resin injection hose and leaching the injection resin from the fractured part into a joint part of a concrete member. . In the water stop method of the concrete joint part according to claim 1,
The resin injection pressure amount when the injection resin is injected in the fourth step is higher than the water injection pressure amount when the water is injected in the third step. Water stop method.

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