JPS638154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Objects of the Invention) (Industrial Application Field) The present invention relates to a method for injecting an adhesive, and in particular to a method for injecting an adhesive suitable for repairing cracks in concrete structures.

(Prior Art) As a method for repairing cracks ordered in concrete, putty filling and adhesive injection methods are usually used.

Recently, a repair method using adhesive injection involves attaching injection pipes to the crack at appropriate intervals, sealing the parts other than the injection pipe installation parts, and after the sealing material hardens, connecting an injection pump to the injection pipe and injecting adhesive. A method has been proposed (Patent No. 251791).

In addition, especially recently, an elastic film-like body is fixed to the crack opening of a structure, and then a repair material is injected into the elastic film-like body, and the contractile force of this elastic film-like body is used to constantly inject the repair material. A method for repairing cracks in structures has been proposed in which a repair material is press-fitted into the crack by applying pressure (Japanese Unexamined Patent Application Publication No. 1983-1989).
28926).

(Problems to be Solved by the Invention) Although it can be acknowledged that the former method has a repair effect, there are some difficulties in the work. For example, since the adhesive is viscous, if the speed of injecting the adhesive into the crack gap is increased, injection pressure will be applied to the adhesive injection point and the injection pressure will increase.
As a result, there is a problem in that the sealing part may become punctured or the crack width may become wider. Therefore, it was necessary to inject the adhesive at a low speed of 3 to 5 minutes per injection point, which required a highly skilled worker.

As is clear from the diagram and explanation, the latter method involves fixing an elastic membrane over a wide area to the crack opening and using the pressure of the elastic membrane to apply the repair material into the crack over a wide entrance area. Although the adhesive is press-fitted and is effective, the adhesive adheres to the exterior surface of the structure, and the adhesive that cannot be completely injected remains as it is, leaving problems in post-processing.

(Structure of the Invention) (Means for Solving the Problems) The present invention provides an injection pipe and an injection hose having a washer attached to the object when injecting adhesive into an object to be injected such as a crack of a concrete structure. An adhesive reservoir is provided between the pipe and the adhesive is pooled in the adhesive reservoir while injecting adhesive into cracks, etc., and when the adhesive is pooled in the adhesive reservoir, the injection hose side is closed and the pool is removed. The present invention attempts to eliminate the drawbacks of the conventional adhesive injection repair method by injecting the adhesive by continuously changing the adhesive reservoir.

(Example) Next, the present invention will be explained based on the drawings.

Figure 1 shows cracks A that occur on concrete structures such as the underside of concrete bridge decks, with cracks placed approximately every 20 cm.
The adhesive reservoir B connected to the injection pipe having the mounting washer as shown in FIGS. and 4 is shown attached with putty adhesive (sealant) as shown in FIG. 2. Cracks other than the attachment point of the adhesive reservoir connected to the injection pipe with the attachment washer are sealed with putty adhesive.

FIG. 3 shows one embodiment of the adhesive reservoir, 1 is an injection pipe, 3 is an adhesive reservoir, and the injection pipe 1 has a mounting washer 6 attached to one end and is made of metal or plastic. Reservoir 3
is made of an elastic body such as rubber, such as a rubber pipe, which expands when a certain pressure is applied to the crack A and relieves the pressure applied to the crack A.

The rubber pipe serving as the adhesive reservoir 3 is located between the injection pipe 1 and a pipe 2 made of the same material, and the ends of the pipes 1 and 2 are respectively fitted inside. The fitting part is tightened 4 times.

5 is a rubber for connecting an injection hose and is connected to the other end of the pipe 2. 6 is fixed near the injection port of the injection pipe 1 with a washer. Figure 4 shows pipes 1 and 2.
An adhesive reservoir 3 is placed between the pipes 1 and 2, and both ends of the adhesive reservoir 3 are fitted inside the ends of the pipes 1 and 2, respectively.

Therefore, when injecting adhesive into a crack, etc., the above-mentioned part is attached and the injection pipe 1 is attached to the crack, etc. using the washer 6. However, after attaching the injection pipe to the crack, etc. in advance, It may be used as a part having the above structure at the time of injection.

After the adhesive reservoir 3 is configured for the crack A in this way as explained in FIG. When an adhesive such as epoxy resin or unsaturated polyester resin is injected, the injection pressure at the time of injection forces the adhesive into the crack A gap, and the adhesive is also filled inside the adhesive reservoir, creating a constant pressure on the crack A. When pressure is applied to the crack A, the adhesive reservoir 3 expands to relieve the pressure on the crack A, as shown in FIG. After injecting the required amount of adhesive, close the end of the injection hose side pipe 2, the end of the adhesive reservoir 3, etc. to prevent backflow of the adhesive, and close the injection hose to the adhesive reservoir 3.
Separate the infusion pump by separating it from the infusion pump.
Here, it is sufficient to close the end of the injection hose side pipe 2, the end of the adhesive reservoir 3, etc. by the usual closing method. For example, as shown in FIG. You can either put a stopper on it, caulk it, use a valve device, or tie it with a string. It goes without saying that the adhesive reservoir may also be made in the same manner. In this way, move to the next construction location. This is how the process proceeds. After completing the injection work (after removing the injection pump)
The adhesive injected into the adhesive reservoir penetrates deep into the crack under the pressure of the rubber until the adhesive gels and loses its fluidity.

Therefore, the working time of each injection pump can be greatly reduced due to the effect of the pressure buffering effect and the effect of maintaining the pressure due to the expansion of the adhesive reservoir.

Next, another embodiment of the adhesive reservoir will be described with reference to FIG.

Reference numeral 13 denotes a container serving as an adhesive reservoir, and the adhesive reservoir 13 has an opening 31 that opens into the injection pipe 1 and is directly attached to it, and has a partition plate 32 inside that slides watertightly around the inner circumference of the container, and this partition plate. 32 and the container wall 33, and a spring body 34 that operates when applied to the partition plate 32.

The injection pipe 1 thus has a washer 6 similar to the structure shown in FIGS. 3 and 4, and performs the same operation as in the previous embodiment.

At this time, when the adhesive is press-fitted into the crack A, the adhesive reservoir 13 is also filled with adhesive, and when a certain pressure is applied to the crack A, the adhesive reservoir 13 is filled with adhesive.
The adhesive presses the partition plate 32 inside, and the spring body 3
4 responds and relieves the pressure on crack A. After the injection work is completed, as in the previous embodiment, by closing the rubber pipe 5 on the opposite side of the concrete structure, the adhesive in the adhesive reservoir 13 is removed by the partition plate 32 and the spring body 34.
It moves due to the force that returns to the source, and continues to work to push it deep into crack A.

〔Effect of the invention〕

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

Various types of injection pumps can be used, such as plungers, gear pumps, and grease pumps.

Even if a plunger type pump is used, the pulsation of its discharge can be alleviated by the adhesive reservoir.

Even if the speed of injection of the adhesive into the object to be injected is increased, the injection pressure applied to the object to be injected is relaxed, so that the sealed portion will not be punctured or the crack width will not be widened.

Since the adhesive reservoir is attached by attaching the washer-equipped injection pipe to the structure using a mounting washer, the exterior of the structure is not significantly damaged. It can also deal with small scratches.

Even after the injection pump is removed, the adhesive remaining in the adhesive reservoir is injected into the object due to continuous changes in the adhesive reservoir, so that sufficient adhesive can be injected.

Therefore, since the adhesive injection site can be moved from one adhesive injection site to the next, the working time for injection can be shortened.

The present invention is not only suitable for repairing cracks in concrete structures, but can also be widely used in concrete structures, such as reinforcing steel plate injection and bonding, and repairing voids.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the case where the present invention is applied to cracks occurring in concrete structures such as the bottom surface of concrete bridge decks, Figure 2 is a partially enlarged sectional view of Figure 1, Figures 3 and 4. 5 is an explanatory diagram showing the adhesive reservoir, FIG. 5 is an explanatory diagram showing the operation of the adhesive reservoir, and FIG. 6 is a diagram showing another embodiment of the adhesive reservoir. In the drawings, 1 is an injection pipe, 2 is an injection hose side pipe, 3 and 13 are adhesive reservoirs, and 6 is a mounting washer.

Claims (1)

[Claims] 1. When injecting adhesive into an object to be injected, an adhesive reservoir is provided between an injection pipe having a washer to be attached to the object to be injected and an injection hose side pipe, and the adhesive is pooled in the adhesive reservoir during adhesive injection. and when the adhesive is pooled in the adhesive reservoir, the injection hose side is closed and the pooled adhesive is injected by continuous change of the adhesive reservoir.