JPS5812909Y2 - Device for injecting chemical liquid into the ground - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for injecting a chemical solution into the ground, and particularly to a device for injecting cement milk for foot hardening into the tip of a hollow ready-made pile buried in the ground.

BACKGROUND ART Conventionally, an injection device for injecting a soil hardening agent or the like is equipped with a nozzle at the tip of an injection rod for injecting a chemical liquid or the like in a direction substantially perpendicular to the central axis of the injection rod.

Then, this rod is rotated and water is injected from a nozzle to excavate the ground, or to inject a ground hardening agent such as cement milk.

However, since the tip of this injection rod excavates into the ground, dirt flows back into the injection nozzle at the tip, often clogging the nozzle and making it impossible to spray the chemical solution.

This invention solves this drawback, and its purpose is to propose an injection device equipped with an obturator that closes the nozzle when not injecting a chemical solution and opens the nozzle when injecting it.

This will be explained below with reference to the illustrated embodiments.

In Fig. 1, injection rod 1 (hereinafter referred to as rod)
At the tip of the rod, a T-shaped feed pipe 2 is arranged at right angles to the central axis of the rod, and an injection nozzle 3 (
(hereinafter referred to as a nozzle) is attached.

Inside the feed tube 2 is an obturator 6, which has a rod 4 with an acute angle at its tip and a flange 5 at its rear end.

There is a spring 7 between the flange 5 at the rear end of this obturator 6 and the 2 end of the feed pipe on the opposite side of the nozzle 3.
The tip of the rod 4 is pushed into the nozzle 3 and closes it.

The length of the rod 4 is longer than the distance between the open end of the hollow part 8 of the rod 1 and the nozzle 3, and the flange 5 is located at a position set back from the open end of the hollow part 8 on the opposite side of the nozzle 3. ing.

Further, the end surface of the flange 5 is in close contact with the surface of the feed pipe 2 and is slidable.

The structure of this injection device is as described above, and the state in which the chemical solution is injected into the ground by this device is as shown in FIG.

The chemical liquid 9 force-fed into the feeding pipe 2 through the space 8 of the rod 1 presses the flange 5 surface in the opposite direction of the nozzle 3 due to its hydraulic pressure, and pushes the obturator 6 against the elasticity of the spring 7.
It is possible to open the nozzle 3 by retracting the rod 4 and separating the tip of the rod 4 from the nozzle 3.

The injection device of this invention is as described above, and is an injection device in which a feeding tube 2 is attached to the tip of the rod 1 at a substantially right angle to its central axis, and a nozzle 3 is attached to the tip of the feeding tube 2. Inside the feed pipe 2 is a rod-shaped obturator 6 having a flange 5 at one end.

This obturator 6 is urged toward the nozzle 3 by a spring 7 from the opposite side of the nozzle 3, and the rod-shaped tip is attached to the nozzle 3.
It is in pressure contact with.

Therefore, the nozzle 3 is closed by the obturator 6 when the chemical liquid is not being injected, that is, when the injection liquid pressure is not acting within the feeding pipe.

However, when the chemical liquid is forced into the feed pipe, this liquid pressure presses the flange 5, compresses the spring 7 behind the flange 5, moves the obturator 6 backward, opens the nozzle 3, and transfers the chemical liquid 9 to the nozzle 3. You can spray more.

Since the flange 5 of the obturator 6 slides in close contact with the inner surface of the feed pipe 2, the chemical solution 9 does not enter behind the flange 5 and prevent the movement of the obturator 6.

In addition, the strength of the spring 7 is determined by the hydrostatic pressure due to the height of the rod or the pressure applied from the outside, which causes the obturator 6 to retreat and cause the nozzle 3 to
It is strong enough not to open the chemical liquid 9, and opens only when the pressure of the chemical liquid 9 required for injection is applied.

This invention is as described above, and since the nozzle of this device opens only when spraying the chemical, there is no possibility that dirt or the like will flow back into the nozzle and cause the nozzle to become clogged.

[Brief explanation of drawings]

The drawings show an embodiment of the device according to this invention, with FIG. 1 being a sectional view showing a state in which a chemical solution is not being injected, and FIG. 2 being a sectional view showing a state in which a chemical solution is being pumped and injected. 1...Injection rod, 2...Feeding pipe, 3
...Injection nozzle, 4...Rod body, 5...
... Flange, 6 ... Obturator, 7 ...
... Spring, 8 ... Hollow part, 9 ... Chemical solution.

Claims (1)

[Scope of utility model registration request] In an injection device in which a feeding tube having an injection nozzle at the tip is disposed at a distal end of an injection rod substantially perpendicular to the central axis of the rod, a rod-shaped obturator having a flange at one end is disposed within the feeding tube. This obturator is biased by a spring from the opposite side of the injection nozzle, and the rod-shaped tip comes into pressure contact with the injection nozzle and closes it, and the flange peripheral end surface of one end is slidably and tightly attached to the inner surface of the feed pipe. An apparatus for injecting a chemical into the ground, wherein the spring is compressed by the hydraulic pressure in the supply pipe, the obturator is retracted, and the injection nozzle is opened.