JPS647189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an injection device for use in an adhesive injection method, particularly an injection method suitable for repairing cracks in structures.

(Prior Art) As a method for repairing cracks in structures made of concrete, stone, etc., putty filling and injection of adhesive are commonly used.

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

Moreover, more recently, an elastic film-like body is fixed to the crack opening of a structure, and then a repair material is injected into this elastic film-like body, and the contractile force of this elastic film-like body is used to continuously inject the repair material into 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 (Utility Model Application No. 53-28926).
issue).

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 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, causing a puncture or even widening the crack. Therefore, it was necessary to inject the adhesive material at a low speed of 3 to 5 minutes per injection point, which required the skill of the operator.

According to the latter method, it is possible to evaluate the point that constant pressure is applied to the repair material by the contraction force of the elastic film-like body, but as shown in Figure 2, the elastic film-like body is directly applied to the repair material. The repair material adheres to the crack opening, covers the crack with an elastic film, and presses the repair material into the crack over a wide area, causing the repair material to adhere directly to the structure and even inject into the crack. Any repair material that cannot be completely removed will remain and will seriously damage the exterior of the structure.

(Problems to be Solved by the Invention) The present invention was proposed in Japanese Patent Application No. 54-77873 (Japanese Unexamined Patent Publication No. 56-2367) in order to solve these problems. When injecting adhesive into the object to be injected, the adhesive injection pressure applied to the object to be injected is alleviated by pooling the adhesive in a pressure buffer provided at any point between the injection pipe and the injection hose. The present invention also proposes an apparatus for use in an adhesive injection method in which the pooled adhesive is injected into an object to be injected by changing the connection of the pressure buffer.

[Structure of the invention]

(Means for Solving the Problems) The present invention relates to an injection device used in this injection method, and includes an injection pipe having a mounting washer at one end and an injection port corresponding to the injection port. One end of a pressure buffer tube is connected and fixed to one end, and an injection hose side pipe is connected and fixed to the other end of the pressure buffer tube, and a check valve device is provided on the injection hose side pipe to form an adhesive injection device. be.

(Example) Next, an example of the present invention will be described based on the drawings.

In FIG. 1, 1 is an injection pipe, and 3 is a pressure buffer tube made of a rubber tube. The injection pipe 1 has a mounting washer 6 at one end, and the injection pipe 1 and the pressure buffer tube 3 are connected by screwing a thread 1' provided on the outside of the injection pipe 1 into a hollow connecting member 12 provided with a thread 12' on the inside. Then, the connection member 12 is inserted into the end of the pressure buffer tube 3 and the pressure buffer tube 3 is integrated. Here, the injection port of the injection pipe 1 is made to have a size commensurate with the injection port. Furthermore, connection member 1
The fixing member 11 is screwed onto the external thread 12'' of No. 2 using the screw 11' provided inside the hollow fixing member 11 to firmly integrate the fixing member 11. Note that the washer 6 above the injection pipe 1 The pipe 2 and the pressure buffer tube 3 located on the injection hose side are connected to the thread 23' provided on the outside of the hollow connection member 23 inserted into the end of the pressure buffer tube 3, and the connection part 2
It is screwed together with a screw 21' provided on the inside of 1 and is integrated. The connecting portion 21 and the pipe 2 are integrally formed. Then, in order to strengthen the connection between the connecting member 23 and the pressure buffer tube 3, a screw 22' provided inside the hollow fixing member 22 is screwed into an external thread 23' of the connecting member 23 to fix the connecting member 23.
Reference numeral 7 designates a ball-shaped check valve, which is located in a valve chamber 8 that is formed by providing a step in the pipe 2 and has a larger inner diameter than the other valve chamber 8, and the check valve 7 and the valve chamber 8 form a check valve section. There is. Here, pipe 2 and pressure buffer tube 3
The fixing member 22 has an inner diameter clearly larger than the diameter of the valve 7 on the pipe 2 side, but has a protrusion 9 to prevent the valve 7 from being pushed in.

Thus, as a whole, the injection pipe, the pressure buffer tube, and the check valve part form an adhesive injection device.

The adhesive injection device thus constructed is used in the following manner.

Figure 2 shows cracks A occurring on concrete structures such as the underside of concrete bridge decks using adhesive injection device B shown in Figure 1 every 20 cm to apply putty-like adhesive (sealant) to cracks A as shown in Figure 3. This shows how it is installed. Cracks other than where the injection pipe is attached are sealed with putty adhesive.

In this way, preparations are made for injecting the adhesive into the crack, that is, the adhesive injection device is attached to the crack using a washer, and preparations are made for injecting the adhesive into the crack. Afterwards, connect the injection hose 5 from the adhesive injection pump to the pipe 2 and apply epoxy resin to the crack A gap of the structure such as concrete.
Inject adhesive such as unsaturated polyester resin.
Due to the injection pressure during injection, the adhesive is press-fitted into the crack A gap, while the pressure buffer tube 3 made of a rubber pipe for pressure buffering is also filled with the adhesive, and when a certain pressure is applied to the crack A, the fourth As shown, the pressure buffer tube 3 expands to saturate the pressure on the crack A. After injecting the required amount of adhesive, separate the injection hose and move to the next installation location. The process proceeds in this way. Even after the injection operation is completed (after the injection pump is removed), the adhesive sealed in the pressure buffer tube penetrates into the crack immersion area under the pressure of the rubber until the adhesive loses its fluidity due to gelation. Further, due to the action of the check valve section, the adhesive material pooled in the pressure buffer tube does not flow back.

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 a plunger, gear pump, and grease pump.

Even if a Blangier type pump is used, the pulsation of its discharge can be alleviated by a pressure buffer tube.

Even if the injection speed of the adhesive material 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.

This device has a pressure buffer tube and a mounting washer, and is connected to an injection pipe that has an injection port that matches the injection port, so it can be stably attached to the adhesive injection point such as a crack in a structure using the washer. At the same time, the adhesive in the pressure buffer tube can be injected into a crack or the like in a small area through an injection pipe.

Therefore, the adhesive is injected into the crack, etc. in a small area through the injection port of the injection pipe attached to the mounting washer, and the adhesive that cannot be completely injected into the crack, etc.
Since it remains in the pressure buffer tube, it does not significantly damage the exterior of the structure.

As is known in the art, an elastic membrane is directly fixed to the crack opening, the crack is covered with the elastic membrane, and an adhesive is pooled between the structure and the elastic membrane to create a large area. In the method of injecting adhesive into cracks, a considerable amount of adhesive that cannot be injected remains and adheres to the walls of the structure.
Significant damage to the exterior. Moreover, even if post-treatment is to be carried out, it will require a considerable amount of effort and will further damage the wall surface.

An injection pipe with a mounting washer is used at one end of the pressure buffer tube, a hose side pipe is connected to the other end, and a check valve device is used here. It can be fixed to objects, and the adhesive injected into the pressure buffer tube will not flow back due to the check valve device. Therefore, after attaching the mounting washer to the adhesive injection point on the structure, injecting the adhesive from the hose side pipe, and storing a certain amount of adhesive in the pressure buffer tube, the worker can immediately move on to other construction areas. can be moved to.

Even after the injection pump is removed, the adhesive remaining in the pressure buffer tube is injected into the object to be injected due to the continuous pressure of the pressure buffer tube, and it does not flow back, so it is possible to inject enough adhesive to crack the structure. .

The adhesive is injected into the structure using the sustained pressure of the pressure buffer tube, and since there is no backflow of the adhesive, the worker can immediately transfer to another work area without having to see that the adhesive is completely injected into cracks, etc. It is possible to move from one place to another, thereby reducing work time.

This invention is suitable for repairing cracks in concrete structures, stone structures, etc., and can also be widely used for reinforcing steel plate injection and bonding, and for filling and repairing voids.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, Fig. 2 is an explanatory view showing the case where the invention is applied to cracks occurring in concrete structures such as the lower surface of concrete bridge decks, and Fig. 3 is a cross-sectional view showing an embodiment of the present invention. FIG. 4 is an explanatory diagram showing the operation of the pressure buffer tube. In the drawings, 1 is an injection pipe, 2 is an injection hose side pipe, 3 is a pressure buffer tube, 7 is a ball valve, 8 is a valve chamber, and 9 is a projection.

Claims (1)

[Claims] 1. Connect and fix one end of the pressure buffer tube to the other end of the injection pipe that has a mounting washer on one end and has an injection port that matches the injection port, and connect and fix the injection hose side pipe to the other end of this pressure buffer tube. An adhesive injection device that also includes a check valve device on the injection hose side pipe.