JPH0680247B2 - Square column hardening material injection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a quadrangular prism hardened material which is constructed for the purpose of stabilizing soft ground, foundation of structures, support of natural ground, connecting walls of underground parking lots and basements, floor slabs and underground dams. It concerns the injection method.

[0002]

2. Description of the Related Art Conventionally, a CCP method, a JSG method, a CJG method or the like is used as a method for inserting a casting pipe into a target ground and injecting a hardening material at a high pressure to inject the hardening material into the ground to form a hardening material injection layer. There is. In any of the construction methods, while the injection pipe was being rotated and raised, the curing material was injected under high pressure from the lower end of the injection pipe to inject the curing material into the ground to form a columnar curing material injection layer.

When a continuous wall is to be formed by this cylindrical hardening material injection method, the cylindrical hardening material injection layer 101 must be overlaid and formed as shown in FIG. The portion indicated by T in the figure is the wall thickness of the connecting wall, and the arc portion 10 inside and outside the wall thickness T
4.105 was a waste of construction together with the part 106 that was built up in the wall and was extremely inefficient. In addition, according to the columnar hardening material injection method, it is impossible to control the distance that the hardening material is sprayed from the nozzle to the ground to reach it, and therefore it is impossible to adjust the thickness of the connecting wall. It was

Further, according to the columnar hardening material injection method,
As shown in FIG. 10, since the injection is performed radially from the nozzle 103 with the injection pipe 102 as the center, the injection area is narrow, construction time is long, and construction efficiency cannot be said to be good. In addition, the foundation work in a narrow space where a house is built cannot control the distance that the hardened material reaches from the nozzle to the ground, which affects adjacent areas and makes it difficult to perform construction in a narrow space. It was something.

[0005]

However, the conventional cylindrical hardening material injection method is inefficient in forming a continuous wall as described above, the wall thickness cannot be freely adjusted, the construction time is long, and the construction time is narrow. It could not be constructed.

[0006]

In view of the above-mentioned circumstances, the present invention enables efficient wall body construction, the wall thickness can be freely adjusted, the construction time is short, and construction in a narrow space is possible. Therefore, in the construction method of inserting the injection pipe into the target ground and injecting the hardening material at high pressure to inject the hardening material into the ground to form the hardening material injection layer, the arm is pivotally attached to the lower end of the injection pipe so as to be openable and closable, A nozzle is installed at the tip of the arm in the tangential direction of the injection pipe, and while opening and closing the arm, the hardening material is injected at a high pressure from the nozzle to inject the hardening material into the ground to form a square pillar hardening material injection layer. Provide a construction method.

[0007]

[Function] While the arm at the lower end of the injection pipe is opened and closed, the hardening material is injected at a high pressure from the nozzle at the tip of the arm to inject the hardening material into the ground, and the injection pipe is further moved up to perform the same operation. Create injection layer. The same construction is performed on adjacent soils one after another to form a quadrangular prism hardened material injection layer.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to a specific embodiment shown in the accompanying drawings. As shown in FIG. 1, a base end of an arm 2 is pivotally attached to a lower end of an injection pipe 1 for injecting a hardening material such as cement milk into the ground, and the arm 2 can be opened and closed by an appropriate means. The nozzle 3 is arranged at the tip of 2 in the tangential direction of the injection tube 1. The hardening material reaching the nozzle 3 through the injection pipe 1 is injected into the ground at a high pressure of about 200 kg / cm ² .

A method of injecting a quadrangular prism hardened material using this injection pipe 1 will be described. First, as shown in FIG. 2, the target ground 11 is provided with a drilling hole 12 to a required depth by an appropriate means such as a boring machine or an earth auger. Next, as shown in FIG. 3, the injection pipe 1 is inserted into the hole 12. Subsequently, the injection tube 1 is pulled up while the arm 2 is opened, and the state shown in FIG. 4 is obtained.

In the state shown in FIG. 4, the arm 2 is fully opened, and from there, a hardening material such as high-pressure cement milk that has passed through the injection pipe 1 is jetted from the nozzle 3. The arm 2 is closed while jetting from the nozzle 3. The hardened material reaches about 1 to 3 m when pressure is 400 kg / cm ^{2 on} soft ground, and pressure on soft rock.
It is about lm at 600 kg / cm ² . The state in which the arm 2 is closed is the state shown in FIG. This is the end of the first step injection. It should be noted that the curing material may be injected only by the curing material alone, or may be injected together with the compressed air.

When the injection is completed in the state of FIG. 5, the nozzle 3
Since the arm 2 is changed from the fully open state to the fully closed state while further injecting the hardening material, a rectangular pillar shaped hardening material injection layer indicated by V ₁ in FIG. 1 having a constant thickness and a rectangular shape in plan view is formed. Create. When the injection of the curing material is not sufficient for the rectangular column-shaped curing material injection layer V ₁ , it is possible to inject the curing material twice on the same ground.

Next, as shown in FIG. 6, the injection pipe 1 is raised by, for example, about 2.5 cm. This increases the injection step. When the injection pipe 1 is stepped up to the state shown in FIG. 7, while the arm 2 is opened, the hardening material is continuously ejected from the nozzle 3 until the arm 2 is fully opened. Then, similarly to the above, as shown in FIG. 1, a quadrangular prism hardened material injection layer V ₂ is formed.

Similarly, the injection pipe 1 is stepped up to a required height to form a quadrangular prism hardened material injection layer V.
When it is desired to connect the quadrangular column-shaped hardening material injection layers in the left-right direction as well, the quadrangular column-shaped hardening material injection layers are similarly formed and continuously arranged at the adjacent positions of the quadrangular column-shaped hardening material injection layer.

The injection tube 1 may be configured as shown in FIG. That is, in order to ensure the opening and closing of the nozzle 3, the auxiliary arm 11 is used, one end of the auxiliary arm 11 is fixed to the nozzle 3, and the pin 12 is projectingly provided at the other end of the auxiliary arm 11.
The pin 12 is slidably fitted in a vertical guide groove 13 formed in the lower portion of the injection pipe 11 in the vertical direction. Further, the metal tube 14 for introducing the hardening material is housed in the injection tube 1, the lower end thereof is arranged in the vicinity of the lower portion of the vertical guide groove 13 and is bent so as to face the position of the nozzle 3, and the metal tube 14 is bent. The lower portion 15 and the nozzle 3 are connected by a flexible rubber tube 16. By doing so, it is possible to smoothly open and close the nozzle 3 that injects the high-pressure curing material.

Further, in the above-mentioned embodiment, an example in which the hardening material injection layer is a vertical wall body is described, but the present invention is not limited to this, and can be applied to a floor slab of a horizontal wall body. It can also be an oblique cylinder that houses an escalator or the like. Furthermore, although the arms 2 are provided on both sides of the injection tube 1 in the illustrated example, they may be provided on one side as necessary.

[0016]

INDUSTRIAL APPLICABILITY As described above, the present invention is a method for forming a hardening material injection layer by inserting an injection pipe into a target ground and injecting the hardening material at a high pressure to inject the hardening material into the ground. The arm is pivotally attached to the lower end of the arm, and the nozzle is installed at the tip of the arm in the tangential direction of the injection pipe. While the arm is opened and closed, the hardening material is injected at a high pressure from the nozzle to inject the hardening material into the ground to cure the square pillar. Since this is a quadrangular column-shaped hardening material injection method that creates a material injection layer, the efficiency of creating a hardening material injection layer is better than that in which a hardening material is injected radially like the conventional cylindrical hardening material injection method. .

Further, in the case of forming the connecting wall by the conventional columnar hardening material injection construction method, the columnar hardening material injection layer had to be formed by stacking, so that the efficiency was very poor. According to the method for injecting a quadrangular prism hardened material of the present invention, such waste is eliminated and the construction efficiency is good. Furthermore, according to the conventional cylindrical hardening material injection method, it is impossible to control the distance that the hardening material is sprayed from the nozzle to the ground, and thus it is impossible to adjust the wall thickness. However, according to the present invention, the wall thickness can be easily adjusted.

Further, according to the conventional columnar hardening material injection method, since the distance that the hardening material reaches from the nozzle to the ground cannot be controlled in the foundation work in a narrow place where the house is built, the adjacent area cannot be controlled. However, according to the quadratic prism-shaped hardening material injecting method of the present invention, it is possible to inject the hardening material injecting direction from the nozzle along the boundary line, so that it can be applied to the adjacent area. It has no effect.

[Brief description of drawings]

FIG. 1 shows a perspective view of an injection pipe of a concrete example used in the method for injecting a quadrangular column-shaped hardening material of the present invention, and a quadrangular column-shaped hardening material injecting method formed by the injection tube.

FIG. 2 is a vertical cross-sectional view in which a hole is formed in the ground.

FIG. 3 is a vertical cross-sectional view with an injection tube inserted.

FIG. 4 is a vertical cross-sectional view of a state in which the injection pipe is pulled up and the curable material is ejected from the nozzle while the arm is closed while ejecting the curable material from the fully opened arm.

FIG. 5 is a vertical cross-sectional view showing a state in which the state in which the arm is closed and the hardening material is ejected from the nozzle is ended.

FIG. 6 is a vertical cross-sectional view showing a state where the injection tube is stepped up.

FIG. 7 is a vertical cross-sectional view showing a state in which a hardening material is sprayed from a nozzle while opening an arm.

FIG. 8 is a side view of an injection tube according to another example of the present invention.

FIG. 9 is a plan view showing a connecting wall formed by a conventional columnar hardening material injection method.

FIG. 10 is a plan view illustrating a conventional cylindrical hardening material injection method.

[Explanation of symbols]

 11 ... Ground 1 ... Injection pipe V ... Curing material injection layer 2 ... Arm 3 ... Nozzle

Claims (1)

[Claims] 1. In a construction method in which an injection pipe is inserted into a target ground and a hardening material is injected at a high pressure to inject the hardening material into the ground to form a hardening material injection layer, an arm is pivotably attached to a lower end of the injection pipe so as to open and close. Wear a nozzle at the tip of the arm in the tangential direction of the injection pipe, and while opening and closing the arm, inject the hardener at a high pressure from the nozzle to inject the hardener into the ground to form a square pillar hardener injection layer. Material injection method.