JPS6253648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for injecting a ground hardening agent such as cement milk or water glass chemical into the soil to prevent soil collapse and stabilize the ground during foundation construction. Regarding pipes.

Conventionally, soil hardening agent is injected by inserting an injection pipe into a pre-bored injection hole, injecting the hardening agent into the surrounding soil from an injection nozzle drilled at its tip, and pulling it out while rotating the injection pipe. The method used is to crush and mix particles from the surrounding ground to solidify the ground and create a hardened layer. However, when creating this hardened layer, the injection tube is equipped with a nozzle consisting of a small hole at the tip, and injection is performed from this nozzle, that is, a jet stream based on a trajectory of points.
When this was rotated and pulled up, the locus took on a screw-like shape, so the distribution of the curing agent was not uniform and was non-uniform.

In view of the above, the present invention deals with this problem.The purpose of the present invention is to easily create a homogeneous and stable hardening agent by injecting the hardening agent in a film jet from the periphery of the distal end of the injection tube. The purpose is to provide injection tubes.

Embodiments of the present invention will be described below based on the accompanying drawings.

Reference numeral 1 denotes an injection tube. A crown 2 is screwed onto the tip of the injection tube 1, and the crown 2 is rotated and moved up and down by the operation of a drive section 3. A swivel 4 introduces the curing agent in the tank 5 into the injection pipe 1.

The crown 2 is formed by forming the end of the injection tube 1 into a concave conical shape, and has a conical concave portion 6 at the tip, and a jet flow passage 7 with a slight gap around the circumference is provided in this concave portion to form a convex conical shape. The conical body 8 is provided with a plurality of digging blades 9 on its lower surface and a mounting screw shaft 10 protruding from its upper end. A fitting support member 13 supported at the center of the conical recess 6 by a plurality of branch pieces 11 is supported and formed on the upper part of the crown 2 . The fitting support member 13 has a channel 14 bored in the center and a conical body 8.
A female screw hole 12 is provided which is screwed into the mounting screw shaft 10, and the conical body 8 is screwed into the hole and fixedly attached.

The conical body 8 is provided with a flow path 16 which is provided with a known differential pressure valve 15 that communicates with the flow path 14, and the liquid pumped through the flow path is controlled by adjusting the liquid feeding pressure.
It is also possible to perform downward injection through the differential pressure valve 15.
In addition, dot-like protrusions 17 are appropriately arranged on the outer circumferential surface of the conical body 8, and are brought into contact with the inner circumferential surface of the crown 2, so that the inner circumferential surface of the conical recess 6 provided in the crown 2 and the outer circumferential surface of the conical body 8 It is possible to maintain a constant jet flow path 7 constituted by the gap between the cone body 8 and increase the support strength of the cone body 8, and also to increase the stirring effect when using a two-component chemical solution. Therefore, the curing agent sent into the injection pipe 1 is extended into the conical jet channel 7 on the outer periphery of the conical body 8 provided in the crown 2 and the inner periphery of the conical recess 6, and is applied to the film from the jet nozzle 7' at the lower end. As a jet stream, it disintegrates and agitates the target soil and mixes it in. Since the present invention has the above-mentioned configuration, the curing agent in the tank 5 is
When the curing agent is introduced into the injection tube 1 through the concave part a in the upper part of the crown 2, it passes through the jet channel 7 in the diagonal flow direction and is jetted out from the jet port 7' in the form of a homogeneous film. This method uses a dimensional jet to disrupt the soil described above and stir and mix the hardening agent into the ground. Therefore, unlike the conventional point injection from a small-hole nozzle, the jet is jetted in a film form from the circumferential jet nozzle 7', so regardless of high pressure, medium pressure, or low pressure, the jet is directed toward the soil on average. Because it is jet-injected, it is characterized by the ability to create a homogeneous and stable hardened layer. Furthermore, the above-described modification of high-pressure injection can of course be applied to other types of static-pressure injection.

[Brief explanation of the drawing]

The drawings show an embodiment of an apparatus using the soil hardening agent injection method according to the present invention, and FIG. 1 is a front view;
Figure 2 is a partially enlarged cross-sectional view of the injection pipe, and Figure 3 is a partially enlarged sectional view of the injection tube.
FIG. 4 is an exploded perspective view of the crown. 1~Injection tube, 2~Crown, 3~Drive part, 4~
Swivel, 5-tank, 6-conical recess, 7-jet channel, 7'-spout port, 8-cone, 9-excavation blade, 1
0-screw shaft of conical body, 11-branch piece, 12-female screw hole of fitting support member, 13-fitting support member, 14-channel, 15-differential pressure valve, 16-channel, 17-point-shaped projection, a~ Concavity.

Claims (1)

[Scope of Claims] 1. In a soil hardening agent injection pipe for injecting a soil hardening agent supplied from the ground into the ground, the inner wall at the end of the injection path is recessed into a concave conical shape to form a conical recess;
A fitting support member is formed at the center of the conical recess to support the cone that is inserted into the cone while leaving a slight gap between the inner peripheral surface of the conical recess and the outer peripheral surface of the conical recess. A ground hardening agent injection pipe characterized in that a conical planar injection port is formed by a gap. 2. In the soil hardening agent injection pipe according to claim 1, dotted protrusions are provided on the circumferential surface of the conical body that is fitted and fixed in the conical recess. 3. In the soil hardening agent injection pipe according to claim 1, a lower spout is provided in the center of the conical body that is fitted and fixed in the conical recess, and a differential pressure valve is provided in the inflow path of the spout. .