JPH0140073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing structures, and more particularly to a method for injecting a filler having an adhesive effect into cracks, etc., suitable for repairing cracks in structures made of concrete, stone, etc.

Putty filling and adhesive injection methods are commonly used to repair cracks that occur in structures.

Recently, as a repair method using adhesive injection, injection pipes are installed on the crack at appropriate intervals.
Seal the parts other than the injection pipe attachment part,
A method has been proposed in which after the sealing material has hardened, an injection pipe is connected to an injection pump and the adhesive is injected (Patent No. 251791).

Although it can be acknowledged that this method has a repair effect, there are some difficulties in the work. For example, since the adhesive has viscosity, increasing the speed at which the adhesive is injected into the crack gap creates a problem in that injection pressure is applied to the area where the adhesive is injected, leading to punctures and further widening the crack width. Therefore, it was necessary to inject the adhesive material at a low speed of 3 to 5 minutes per injection point, which required a highly skilled worker.

Therefore, when the adhesive is first injected into the object to be injected, the adhesive pressure exerted by the object to be injected is pooled in a pressure buffer provided at any point from the injection pipe to the injection hose. A method was developed in which the pooled adhesive was further injected into the object to be injected using the sustained pressure of a pressure buffer (Japanese Patent Laid-Open No. 56-2367).

The present invention is an improvement on this method, and includes a method for repairing a structure in which an adhesive reservoir is filled with adhesive in advance and serves to press the filled adhesive, and the entrance and exit of the adhesive is controlled by a valve. By unblocking the entrance and exit of the adhesive by connecting it to the injection pipe attached to the injection point of the object to be injected, and injecting the adhesive into the object by the continuous pressure of the adhesive reservoir, The purpose is to shorten the working time and completely fill cracks with adhesive.

According to this method, the work to be injected can be done in an extremely simple manner by attaching an adhesive reservoir filled with adhesive without bringing a pump into the body, which previously required work using a pump on site. Enables injection of adhesive.

Next, embodiments of the present invention will be described based on the drawings.

Figure 1 shows injection pipes attached to cracks A that have occurred on concrete structures such as the underside of concrete bridge slabs, using washers and putty-like adhesives (sealants), as shown in Figure 2, every 20 cm. . B represents this injection pipe and the like. The crack parts other than the mounting part are sealed with putty sealant.

In Figures 1 and 2, specifically, the injection pipe 1 with washer 3 is fixed at appropriate intervals along the crack, and the adhesive injection port a is closed with a sealing material 2 to prevent the injected adhesive from leaking. Seal the crack surface and around the pipe to prevent it from opening. As shown in FIG. 3a, the injection pipe 1 has a washer 3 at one end, and a thin tube 1a at the other end, with a recess 1b formed so that a check valve, which will be described later, will not seal the pipe. 1c is a screw 4a of the connecting pipe 4, which will be described later.
It is a screw that is screwed into the If a washer 3 is used, as shown in FIG. 6, with a notch 3a provided inside the center of each side, the connecting portion of the structure will be less likely to be punctured.

Next, the adhesive reservoir 5 filled with adhesive is connected to the injection pipe 1 using the connecting pipe 4. As shown in FIG. 3b, the connecting pipe 4 has a screw 4a at one end that is screwed into the screw 1c of the injection pipe 1, and a valve chamber 4b containing a ball-shaped valve 4c at the other end. The adhesive ports 4d and 4e of the valve chamber 4b are formed to be narrower than the hollow portion so that the ball-shaped valve 4c can be closed. The adhesive reservoir 5 is made of something like a rubber hose or balloon with one end closed so that the pressure that acts to press the pooled adhesive is maintained, and the opening is placed at the lower end of the connecting pipe 4. They are integrated by being tightened with a tightening tool 6 such as a band. Here, the adhesive reservoir is not necessarily one that has an elastic restoring force that tries to shrink by its own force, but even if it does not have a pressing force of its own, for example, it can be applied to the spring 7 by an external spring force or the like.
Alternatively, the structure may be such that it can be pressed by a pressing tool such as the plate 8. In the connection between the injection pipe 1 and the connection pipe 4, the thin tube part 1 of the injection pipe 1
Since the portion a protrudes into the valve chamber 4b of the connecting pipe 4, it is designed to bounce the ball-shaped valve 4c.

In this way, preparations for injecting the adhesive into the object to be injected are completed, and the injection is automatically started.

That is, the adhesive reservoir 5 presses the adhesive filled inside by its own force or by an external force, and attempts to push the adhesive toward the injection pipe 1. At this time, since it passes through the connecting pipe 4, the valve 4c of the valve chamber 4b moves upward and acts to close the injection pipe 1, but since the lower end of the injection pipe 1 is provided with a recess 1b, the adhesive material Since the passage is secured, it will automatically penetrate into the crack immersion area. The permeated adhesive does not flow back due to the action of the valve 4c in the valve chamber 4b.

Although this embodiment is from the bottom of the structure, the present invention can also be carried out to repair cracks from the top or side, and in the embodiment, it is not necessary to repair cracks etc. from the bottom of the structure. Of course, it is not necessary.

Since the present invention is constructed as described above, it has approximately the following effects.

In other words, in order to inject the adhesive into the object to be injected, the adhesive filled in the adhesive reservoir is injected through the injection pipe under the sustained pressure of the adhesive reservoir, so that the adhesive is injected into the object in a sufficient amount. This method has the advantage of being extremely easy to install, reducing work time, leaving the site uncontaminated, and highly efficient, as there is no need to bring a pump to the site.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the application of the present invention to cracks occurring in concrete structures such as the underside of concrete bridge deck slabs, Fig. 2 is a sectional view showing its details, and Fig. 3 is an example of the equipment used in the present invention. 4 is an exploded sectional view showing another embodiment of the device shown in FIG. 3, FIG. 5 is a sectional view taken along line A-A in FIG. 4, and FIG. 6 is a plan view showing an example of the washer. . In the drawing, 1 is an injection pipe, 4 is a connection pipe, and 5 is an adhesive reservoir.

Claims (1)

[Claims] 1 Fill an adhesive reservoir in advance that acts to press the filled adhesive, close the entrance and exit of the adhesive with a valve, and connect it to the injection pipe attached to the injection point of the object to be injected. A method for injecting an adhesive material, which comprises: releasing the blockage of the entrance and exit port for the adhesive material, and injecting the adhesive material into the object to be injected by using sustained pressure in the adhesive reservoir.