JPS64547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive injection method used when repairing cracks by injecting adhesive.

When repairing cracks by injecting adhesive into them, depending on the injection pressure, the cracks may expand or the mortar may float. Furthermore, if the injection port is blocked after pouring, the capacity will be reduced by the amount of adhesive that has soaked into the concrete, and the adhesive may not be able to spread throughout the crack.

As a technology to solve these problems,
A device disclosed in Japanese Patent No.-87866 is known.

This device is equipped with a pressure buffer with a check valve made of an elastic material such as a rubber pipe between the injection pipe and the injection hose fixed on the crack.The device cracks the adhesive while buffering the injection pressure. The adhesive is injected into the rubber tube, and as the injection continues, the rubber pipe expands to accumulate adhesive, and then the contraction force of the rubber is used to gradually inject the adhesive.

However, in this device, the rubber pipe will not expand unless the crack is filled with adhesive and the pressure exceeds the injection pressure.
While the rubber pipe expands and stores adhesive, a pressure greater than the normal injection pressure is applied to the crack or floating portion, which may actually widen the crack or encourage the mortar to float.

In addition, since the adhesive accumulated in the rubber pipe is extruded only by the contraction force of the rubber, that is, the force that tries to restore it to its original state, the contraction force gradually weakens as it is extruded, and the injection pressure is restored. It cannot be raised.

In order to eliminate such inconveniences, the present invention aims to efficiently inject fluid without applying excessive pressure to the crack.

In order to solve this technical problem, in the present invention,
A seal is applied along the crack and the injection pulp is fixed, and the tip of the cylinder, which has a flow passage passing through it in the axial direction and a piston with a valve body inserted at the rear, is connected to the injection pipe, and the rear end of the passage is connected to the injection pipe. Connect the section to an adhesive injection machine, inject adhesive into the crack, fill the cylinder with adhesive, stop the injection, block the passage with a valve body, and then press a spring, elastic strip, etc. The technical means is to automatically advance the piston using a tool.

According to this technical measure, initially the adhesive is injected into the crack through the piston channel, the cylinder and the injection pipe, and the adhesive in the crack reaches a predetermined pressure by appropriate known detectors. The syringe is stopped when this is detected, so the adhesive pressure inside the crack does not increase.

If the piston is moved backward in advance, the cylinder will be filled with adhesive when the pressure inside the crack reaches a certain level, but if the adhesive is injected with the piston moved forward, When the adhesive pressure inside the crack reaches a predetermined pressure, the piston is retracted to fill the cylinder with adhesive.

After the injection machine stops injecting, the piston is moved forward using a pressing device such as a spring or elastic strip to inject the adhesive in the cylinder into the crack. At this time, the valve body closes the passage. Because the rear part is closed, the injection machine can be removed and injection work can be performed at other injection ports while the piston moves forward automatically.The work efficiency is extremely high, and the injection machine is kept at low pressure. By injection, it is possible to fill even minute cracks.

As shown in the examples described later, the piston is pressed by a coil spring at its rear end, or by a spring or elastic force stretched between a locking piece protruding from the tip of the injection pipe or cylinder and the rear end of the cylinder. It is moved forward by tension with a strip, etc., or even by air pressure, but even if the pushing force or tensile force is weakened by the advancement of the piston, the rear end of the coil spring can be moved forward,
By re-applying the spring or strip twice, a strong pressing force can be obtained again.

As described above, according to the method of the present invention, it is possible to perform the injection work efficiently without applying excessive pressure inside the crack, and even if the adhesive seeps into the structure, the pressing force is always applied to the piston. , the adhesive is added immediately and the repair effect is sufficient.

Next, the method of the present invention will be explained using an example of the apparatus shown in the drawings.

In FIG. 1, locking pieces 6, 6 are attached to the injection pipe 5.
The protruding part is integrated with the washer 7, and the washer 7
is fixed onto crack 1 with adhesive 2.

The cylinder 11 has its tip screwed onto the injection pipe 5, and the piston 14 has a spring or rubber strip 13 stretched between its rear end and the locking pieces 6, 6.
The structure is such that it moves forward using the power of

A passage 15 is formed in the center of the piston 14 in the axial direction and passes through the head 10 (see FIG. 2), and a check valve 16 is provided at the rear end 17.

When the spring 13 is removed in advance, the piston 14 is moved backward, and the rear end 17 of the passage 15 is communicated with a pipe of an injection machine (not shown), and the adhesive 12 is injected, the adhesive 12 passes through the passage 15. It is injected into the crack 1 through the injection pipe 5 while filling the cylinder 11.

When the injection pressure of the adhesive 12 reaches a predetermined pressure, the spring 13 is stretched between the rear part of the cylinder 11 and the locking piece 6, and the injection machine is removed from the piston 14. Adhesive 1 with the force of
2, and additionally inject the amount of adhesive that has decreased in the crack 1.

In FIGS. 3 and 4, the piston 24 itself is combined with a coil spring 23 to be pressed from behind.

That is, at the center of the head 31 of the piston 24, a lifting protrusion 33 is provided at the rear end, and a lifting protrusion 33 is provided at the rear end.
6 is fixed, and this pipe 2
5 communicates with a hole 32 formed in the center of the head 31.

A disc-shaped pressing member 35 having projecting pieces 36, 36 is loosely inserted into the pipe 25, and a coil spring 23 is located between the head 31 and the pressing member 35, so that the pressure between the head 31 and the pressing member 35 is loosely inserted. Relative advancement and retreat is becoming possible.

The cylinder 21 is formed into a long length and the pressing member 35
A guide hole 37 for the protruding pieces 36, 36 is formed,
An appropriate number of locking recesses 38, 38 are formed in the guide hole 37.

When injecting adhesive using the device of this embodiment, insert the piston 24 shown in FIG. 4 into the cylinder 21, position the head 31 on the distal side of the guide hole 37, and start injection. After the injection is stopped, the pot 26 is closed, and the pressing member 35 is advanced to lock the projection piece 36 in the recess 38 located at the rear of the guide hole 37.

The head 31 is pushed forward by the spring 23, and additional adhesive is injected into the crack 1 as in the previous embodiment.

If it is desired to increase the pressing force of the spring 23, the pressing member 35 may be moved further forward and locked in the recess located in the front.

In addition, in the embodiment shown in FIGS. 3 and 4,
Instead of a coil spring, a chamber filled with gas or air may be provided, and the piston may be pressed using gas pressure or air pressure.

[Brief explanation of drawings]

The drawings all show examples of equipment used in the method of the present invention, with Figure 1 being a longitudinal sectional view of the injection equipment, and Figure 2
The figure is a sectional view of the piston at the point shown in FIG. 1, FIG. 3 is a front view showing a section of a part of the injection device in another embodiment, and FIG. 4 is a right side view of the piston used in this device. be. 1: Crack, 11, 21: Cylinder, 14,
24: Piston, 12: Adhesive.

Claims (1)

[Claims] 1 Apply a seal along the crack and fix the injection pipe, connect the tip of the cylinder with a piston inserted into the flow passage in the axial direction and a valve body at the rear to the injection pipe, and then Connect the end to an adhesive injection machine, inject adhesive into the crack, fill the cylinder with adhesive, stop press-fitting, block the passage with a valve body, and then insert springs, elastic strips, etc. An adhesive injection method characterized by automatically advancing a piston using a pressing tool.