JPS58150618A - Method and apparatus for injection of hardening agent - Google Patents

Abstract

PURPOSE:To effectively inject a hardening agent into the ground by using a simplified trouble-free device in which a single nozzle is used for both water and the hardening agent. CONSTITUTION:In a hardening agent injector having a rotary table 12 to give vertical movement and rotary drive to an injection tube 1, the tip of the injection tube 1 is closed, and the main nozzle 3 having an opening in side wall at the lower end in the horizontal direction and a side nozzle 4 having an opening in the direction to join with the main nozzle 3 from above are provided. Also, a small-diameter tube 5 is fixed to one end in the tube 1, the tip is connected to the side nozzle 4, and the rear end is connected to a material supplyer 8 other than the injection tube 1. Water is first jetted from the main nozzle 3 and air is jetted under pressure from the side nozzle 4, while the injection tube 1 is penetrated into the subject ground with turning. When a given depth is reached, a hardening agent is jetted from the main nozzle 3 and air is jetted under pressure from the side nozzle 4, while the injection tube 1 is turned and raised and the hardening agent is injected into the ground.

Description

[Detailed Description of the Invention] The present invention provides water stoppage, earth retaining,
This article relates to a method and equipment for injecting a hardening agent into the target ground for the purpose of ground reinforcement, etc. Conventionally, this type of hardening agent injection was performed by first spraying lubricating fluid downward [rotating and lowering the injection pipe]. When a predetermined depth is reached, the lower nozzle is closed by operating a differential pressure valve or a closing member of the lower nozzle is inserted from the top, thereby switching to lateral injection. However, inserting the closing member is troublesome. Of course, accuracy cannot be expected, and even in the case of differential pressure valves, the structure is complex and failures are common.Also, since the lower jet hole contacts the top of the excavation from the front, it prevents dirt from entering from there. There was an inconvenience in that it could not be cut and could cause malfunctions such as clogging, leading to accidents such as backflow.

In addition, the use of air in conjunction with side injection of curing agent has been carried out with the aim of achieving various effects, but the internal structure of the injection tube is complicated due to the double structure and flow path configuration, so the expected effect is not achieved. The reality is that it is difficult to obtain.

In view of the above points, the present invention aims to perform effective injection using a device with a simple structure that is less likely to malfunction.

Embodiments of the hardening agent injection method and apparatus according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes the injection pipe body, the tip of which is closed, and is equipped with a drilling blade 2 for drilling a hole with a diameter slightly larger than the injection pipe diameter, and on the side wall is a main nozzle 3 that sprays water in a horizontal direction, and a main nozzle 3 that sprays water in an upward and diagonal lateral direction. A side passage nozzle 4 is drilled to merge from the side passage nozzle 4.

5 is a small-diameter tube fixed to one end of the injection tube 1 by a fixing piece 6, and its tip communicates with the side passage nozzle 4 and via a swivel 7 with a material supply section 8. Further, the material supplied from the material supply section 9 is supplied to the injection tube main body 1 and is injected from the main nozzle 3.

Reference numeral 10 is a connecting portion, and the fixing piece 6 is adjusted by adjusting the screws so that it is aligned in a straight line with one side end of the inner wall of the injection tube, and there is no problem in fixing the J diameter pipe 5 by the fixing piece 6.6. ,
It is designed to allow easy screw connection by inserting small diameter pipes.

Reference numeral 12 denotes a rotary table that drives the injection tube IVc vertically and rotationally. When the injection tube 1 is rotated and lowered while supplying clean water from the supply section 9 and air under pressure from the supply section 8, water is injected from the main nozzle 3. The pressurized water, together with groundwater, plays a lubricating role in the digging of the excavation blade, and
It is caught in the high-speed air jets that are injected and merged from the upper and diagonal sides, creating a turbulent vortex, which stirs the surrounding soil and washes out the cohesive soil, and as the excavation blade 2 excavates the soil, it ascends the cavity A of the excavation hole. It is discharged to the ground due to the lift effect caused by the air.

When the injection tube 1 has descended to a predetermined depth, the injection tube is rotated and raised while supplying curing agent from the supply section 9 and air from the supply section 8 under pressure. At this time, regarding the hardening agent,
When jetting at a high pressure of 00 to 600 cm, the air from the side passage nozzle is wrapped around the curing agent flow, dramatically extending the reach of the jet, cutting the surrounding soil, and removing the curing agent. A hardening agent injection layer B is created by mixing and stirring a hardening agent into soil particles along the trajectory of a jet stream.

Since the present invention is constructed as described above, a simple device with few failures can be used without using a conventional pulp mechanism.
Moreover, the reach distance of the hardener jet can be dramatically extended by pre-cleaning by turbulent fresh water jet, excavation by lift effect, and hardener flow containing air, so it is possible to dramatically extend the reach of the hardener jet. Furthermore, the structure and properties of the injected jet can be changed by selecting the injection material from the main nozzle and the side nozzle, and adjusting the injection pressure difference between the two, so this invention has an extremely wide range of applications. be.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is an explanatory diagram of the construction when the excavation is lowered, Figure 2 is an explanatory diagram of the construction when the injection is raised, and Figure 3 is an enlarged longitudinal section of the main part of the swivel part at the upper end of the injection pipe. 4 is an enlarged vertical sectional view of the wall of the distal end of the injection tube, and FIG. 5 is an explanatory cross-sectional view of the injection tube showing the relationship between the main nozzle and the measuring nozzle. 1~Injection pipe 2~Drilling blade 3~Main nozzle 4~Side channel nozzle 5~Small diameter pipe 6~Fixed piece 7・Swivel 8.9
~Material supply part 10~Connecting part 11~Bearing 12~
Rotary table A ~ Drilling gap B ~ Hardening agent injection layer

Claims (1)

[Claims] (A main nozzle that opens horizontally at the bottom of an injection tube whose tip is closed, and a side passage nozzle that opens in a direction merging with the main nozzle from above are provided at the inner-side end of the injection tube. The tip of the fixed small-diameter pipe is connected to the side nozzle, and while spraying clean water from the main nozzle and air under pressure from the side nozzle, it is rotated and lowered into the target ground, and when it reaches a predetermined depth, the next time A hardening agent injection method is characterized in that the hardening agent is injected into the ground by rotating and raising an injection pipe while injecting hardening agent from a main nozzle and air under pressure from a side nozzle. (2. Scope of Claims In the hardening agent injection method described in item 1, a drilling blade having a digging range larger than the diameter of the injection pipe is attached to the tip of the injection pipe to create a gap between the excavation hole and the wall of the injection pipe. (3) In the curing agent injection method described in claim 1, the side channel nozzle is opened in the direction of merging from the upper diagonal side of the main nozzle. (4) Rotated by a drive mechanism. In a curing agent injection device whose main body is an injection pipe that moves up and down and whose upper end is connected to the material supply section via a swivel, the tip of the injection pipe is closed and the main nozzle opens horizontally on the side wall of the lower end and the upper end is connected to the main nozzle. A side channel nozzle is provided that opens in the direction of merging with this, and a small diameter tube is fixed at the inner end of the tube, its tip is connected to the side channel nozzle, and the rear end is connected to a material supply section separate from the injection tube main body. A curing agent injection device characterized by a communication configuration.