JPS5941251Y2 - Chemical injection device for ground improvement - Google Patents

Description

[Detailed explanation of the invention] This invention consists of an outer pipe for injecting liquid A of a two-part mixed type ground improvement chemical liquid, and
An inner tube for liquid injection is arranged concentrically, and an annular fenestration is provided on the outer periphery of the outer tube, and the outer circumferential surface of the fenestration, the hollow part of the outer tube, and the hollow part of the inner tube are used for injecting liquid A. An elastic annular body made of rubber or the like is fitted into the annular fenestration, and an elastic annular body made of rubber or the like is fitted around the outer circumference of the elastic annular body, and is connected to the lower end of the outer tube and joined to the tip. A chemical liquid injection device for soil improvement, characterized in that a hollow cylinder part extended to the upper end of a lower pipe having a section is fitted, and chemical liquid injection holes are radially bored in the hollow cylinder, The purpose is to effectively inject a two-component mixed ground improvement chemical into the required ground.

The object of the present invention is to provide a new and useful chemical injection device for soil improvement.

Since the proposed device is constructed as described above, both the inner and outer pipes, together with the F section pipe, are brought to the required depth in the ground by using the shoe attached to the tip of the lower pipe connected to the lower end of the outer pipe. After penetrating, liquids A and B, which are two-component mixed ground improvement chemicals, are injected into the outer pipe and the inner pipe, respectively. At this time, the injection holes for liquids A and B are inserted into the outer pipe. It faces the outer peripheral surface of an annular fenestration arranged on the outer periphery, and an elastic annular piece made of rubber or the like is fitted into the fenestration, and a hollow tube extending from the upper end of the lower tube is further placed on the outer periphery of the fenestration. are fitted, and each of the injection holes is sealed by an elastic annular piece and a hollow cylinder, so there is no risk of dirt on the outer periphery entering into the pipe when both the inner and outer pipes penetrate, and the elastic annular piece is protected by a hollow cylinder and there is no risk of damage.

After penetrating both the inner and outer pipes to a predetermined depth in the ground as described above, when liquids A and B are injected into the inner and outer pipes, liquids A and B will flow through the liquid A injection hole and liquid B. The elastic annular body is pushed out in the radial direction from the injection hole, passes through the gap between the annular body and the annular fenestration, and is thoroughly mixed in the gap. It is injected radially into the surrounding ground and solidified to harden and improve the ground.

In this case, as mentioned above, the chemical liquid is given directionality for injection into the ground by the chemical liquid injection hole arranged in the hollow cylinder, and penetrates radially and deeply into the ground, so that the ground improvement effect is achieved. This will be further improved.

Note that the mixed liquid of liquid A and liquid B that has passed through the gap between the elastic annular body and the annular fenestration is prevented from flowing back into the inner and outer tubes due to the presence of the elastic annular body, and is prevented from solidifying within the tubes. It is something.

The present invention will be described below with reference to the illustrated embodiments.

1 is an outer tube with an annular fenestration 2 cut out on its lower outer periphery;
The downward protruding part of the fenestration 2 is provided with an outer peripheral thread part 1a,
A shoe 4 is screwed onto the tip of the lower tube 3 screwed onto the rotating portion 1a.

An inner tube 5 is disposed concentrically within the outer tube 1, and its lower end is fitted onto the outer tube 1 in a water-tight manner at the inner peripheral portion of the annular fenestration 2.

An outer tube 1 is provided on the peripheral wall of the outer tube 10 in the annular fenestration 2 section.
A″t that communicates with the upper hollow part of the inner pipe 5 and the lower end opening of the inner pipe 5.
i, injection hole 6 and B liquid inlet T are drilled, and the fenestration 2
An elastic annular body 8 made of rubber or the like is fitted in the.

Further, a hollow cylinder 9 extending from the upper end of the lower tube 3 is fitted onto the outer periphery of the annular body 8.

The upper edge of the hollow cylinder 9 has radial chemical injection holes 10.
is drilled.

Since the illustrated device is constructed as described above, both the inner and outer pipes 1 and 5 are penetrated into the ground together with the lower pipe 3 to a predetermined depth using the shoe 4, and then the outer pipe 1 and the inner pipe 5 are penetrated into the ground to a predetermined depth. When liquid A and liquid B, which are two-part mixed ground improvement chemicals, are injected,
The A liquid and the B liquid are supplied through the A liquid injection hole 6 and the B liquid inlet I, respectively.
is injected into the outer periphery of the annular fenestration 2 of the outer tube 1, expands the elastic annular body 8 in the radial direction, passes through the gap between the annular body 8 and the annular fenestration 2, and is thoroughly mixed therein. The chemical is injected radially into the outer ground through the chemical injection hole 10 of the hollow cylinder 9, solidifying and improving the ground.

Figure 2 shows the ground improved by this device, and the ground Y, which is surrounded by the radially improved ground X formed by this device and into which no chemical solution is injected, is also consolidated by the improved ground X, and the ground is improved. It is something that can be done.

As mentioned above, the presence of the hollow cylinder 9 and the elastic annular body 8 prevents the chemical liquid once injected into the outer circumferential ground from flowing back into the pipe, and there is no risk of solidification within the pipe.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the chemical injection device for ground improvement according to the present invention, and FIG. 2 is a cross-sectional plan view of the ground improved by the device. 1...Outer tube, 3...Lower tube, 4...
... shoe, 5 ... inner tube, 6 ... A liquid injection hole, 7 ... B liquid injection hole, 8 ... elastic annular body, 9...Hollow tube, 10...Medicine injection hole.

Claims (1)

[Scope of utility model registration request] An outer tube for injecting liquid A and an inner tube for injecting liquid B of a two-component mixed ground improvement chemical are arranged concentrically, and an annular fenestration is provided on the outer periphery of the outer tube, and an annular fenestration is provided on the outer circumference of the outer tube. The hollow part of the outer tube and the hollow part of the inner tube are connected through a liquid A injection hole and a liquid B injection hole, respectively, and an elastic annular body made of rubber or the like is fitted into the annular fenestration. A hollow cylindrical portion that continues to the lower end of the outer tube and extends to the upper end of the lower tube having a joint at the tip is fitted onto the outer periphery, and drug solution injection holes are radially bored in the hollow tube. A chemical injection device for soil improvement that is characterized by the ability to