JPS5952247B2 - Grout injection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grout injection device used in a ground improvement method.

Various devices of this type have been proposed and put into practical use.

In the case of two-component curing injection, the so-called 1.5-shot method is usually used, but in consideration of clogging in the tube, it is preferable that the two-component components join together after exiting the injection tube.

In addition, the injection tubes of conventional injection devices generally do not have good merging, leaving problems with the hardening properties and strength of the chemical solution after injection.

Furthermore, in the case of a double tube, preventing backflow between the inner tube and the outer tube is an important issue.

This invention was developed in view of the above circumstances, and is based on a different perspective from that of injection tubes of conventional injection devices, and solves all the problems to be solved at once.

The present invention will be explained below with reference to specific examples shown in the drawings.The injection pipe of the grout injection device of the present invention has a double pipe structure composed of an inner pipe 1 and an outer pipe 2, and the tip of the inner pipe 1 A check valve 3 is disposed between the inner tube 1 and the outer tube 2 at a nearby position.

A lid 4 is screwed onto the end of the inner tube 1, and a flexible sleeve 5 is placed over the discharge hole 6, and the inner tube 1 and the outer tube 2 are connected to each other at a position above the sleeve 5. A check valve 3 that allows liquid to flow only in the outlet direction is provided between the two.

The check valve 3 is made of a flexible material such as rubber, has an umbrella shape that widens toward the bottom, is fixed at the upper part by a fixing ring 7, and has a peripheral edge at the lower end that is connected to the outer tube 2. It is in contact with the inner surface of the

When injecting using this injection tube, after rotating and inserting the injection tube while spouting jet water from the inner tube 1, liquid A is force-fed into the inner tube 1, and the inner tube 1 and the outer tube Liquid B is pumped between the pump and the pump.

As a result, since the jet water is provided with the check valve 3, it does not flow backward between the inner tube 1 and the outer tube 2, and liquid A and liquid B are mixed together at the tip of the injection tube. , is injected into the target ground from the tip.

Since the check valve 3 and the sleeve 5 allow the liquid to flow during or after injection, the liquid does not flow back between the inner tube 1 and the outer tube 2 and into the inner ν tube 1. There isn't.

Note that the sleeve 5 may not be cylindrical, but may be an O-ring-shaped member, as long as it is a flexible annular member that fits into the discharge hole 6.

As described above, this invention is provided with a check valve between the inner tube and the outer tube that allows the liquid to flow only in the direction of the outlet, so that it is possible to prevent the liquid from flowing backward between the tubes.

Further, the check valve prevents the tip of the inner tube from swinging out, which is preferable.

In addition, while liquid A is pumped through the inner tube and liquid B is pumped between the inner tube and the outer tube, they function as one shot, and the tubes will not become clogged due to mixing.

In addition, the A liquid and the B liquid can be combined at the time they exit the injection pipe, making it possible to inject a two-component hardening grout.

Further, a discharge hole is formed in the peripheral wall of the tip of the inner tube, and while the sleeve is used to cover the discharge hole, liquid A is discharged laterally and liquid B is discharged axially, so that they meet in a cross state, and mixing is ensured.

The check valve and sleeve eliminate any backflow up the injection tube.

Fine-grained injection using sleeve injection becomes possible.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of the main part of the single pipe of the grout injection device of the present invention. 1...Inner pipe, 2...Outer pipe, 3...
... Check valve, 4 ... Lid body, 5 ... Sleeve, 6 ... Discharge hole, 7 ... Curved fixing ring.

Claims (1)

[Claims] 1 A discharge port is formed in the peripheral wall of the distal end of the inner tube, a flexible sleeve is placed over the discharge hole formed in the distal end, and a flexible sleeve is provided between the inner tube and the outer tube at a position above the sleeve. It is characterized by providing a check valve that allows the liquid to flow only in the outlet direction, and forcing liquid A to flow through the inner pipe and discharging it from the discharge hole, as well as forcing liquid B through between the inner pipe and the outer pipe. grouting equipment.