JPS6330449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection injection device, and more particularly to an injection injection device that can improve the effective range of grouting material injection and perform work with high efficiency.

[Conventional technology]

The injection method was developed to eliminate the drawbacks of the conventional chemical injection method as a ground improvement method and to achieve reliable results.

This injection injection method is a type of induced injection method that uses ultra-high pressure jet to break down the ground and fill the voids created by this with grout.

Various types of injection injection methods currently exist, but injection is often performed in the ground below the groundwater level, and in the case of underwater injection, the pressure attenuation of the jet increases with distance. On the other hand, there is a problem in that the effective range from the jet injection nozzle for crushing the ground becomes significantly shorter.

That is, a short effective firing range means that the length of the solidified material formed by filling the grout material becomes shorter, the construction time required to complete the desired work becomes longer, and the work efficiency decreases.

Therefore, in the past, the effective range of jet injection from the nozzle was significantly improved to improve work efficiency.
As a technology to reduce construction costs,
Publication No. 47318 is known.

According to this known example, a cylindrical casing is inserted into the ground, air is blown out from a slot bored in the side of the casing, and a chemical solution is jetted into the ground from the slot. The air is entrained, and the slice in the ground is introduced into the casing through the slot and discharged to the ground from the post-discharge pipe, while the air is replenished from the ground.

[Problem that the invention seeks to solve]

However, in this known example, a large amount of air bulged from the slot flows out from the gap between the hole provided in the ground and the outer wall of the cylindrical casing inserted into the hole, causing an air region in the soil. It is actually difficult to make it exist. In order to make it exist, a very large amount of air must be injected.

In addition, in this known example, since a chemical jet having a high specific gravity and viscosity is ejected together with accompanying air, the ejection distance is shorter than that of fresh water injection, and there is naturally a limit to the distance that the ground can be cut. be.

Therefore, the area excavated by the chemical jet is small, and even if air is stored in this area, the flight distance of the chemical jet is short, so as mentioned above, the effective range is short, and the grouting material This does not solve the conventional problems of shortening the length of the solidified material formed by filling, prolonging the construction time to complete the intended work, and reducing work efficiency.

[Purpose of the invention]

The present invention was made in order to solve such conventional problems, and its purpose is to provide air leakage prevention areas on the casing side and the atmosphere side.
In order to prevent leakage of the air volume that forms the air storage area, reduce the amount of supplied air, and increase the effective range of the chemical solution, we perform preliminary digging with fresh water.
An object of the present invention is to provide an injection injection device that injects liquid grout in an air region filled with air.

[Means for solving problems]

The injection injection device according to the present invention includes a hollow outer tube that is buried to a predetermined depth in the target ground, and a first nozzle disposed inside the hollow outer tube and provided at the tip to inject liquid into the predetermined ground below the level surface. High-pressure injection of grout material,
An injection liquid pipe for injecting or injecting the liquid grout material together with a high-pressure air injection, and a second nozzle provided at the tip thereof are arranged a predetermined distance above the first nozzle in the hollow outer tube. a high-pressure water pipe capable of excavating a predetermined amount of ground directly above the injection injection part of the first nozzle by injecting high-pressure fresh water; and an air pipe supplying and filling high-pressure air into the space excavated by the second nozzle. , a first sealing means provided in the hollow outer tube to prevent high-pressure air in the distal end area from the opening of the air tube from escaping upward in the hollow tube; and a first sealing means in which the hollow outer tube is embedded. The hollow outer tube is rotatably and slidably supported in the opening of the target ground, and the high pressure air supplied from the air tube is connected to the outer peripheral surface of the hollow outer tube in the ground and the surrounding ground. a second sealing means for preventing leakage to the outside from the gap between the two, and a discharge pipe for discharging crushed soil from excavation to the outside; They are configured to perform the above-mentioned predetermined injection operations while moving upward together with the pipe.

[Action of the invention]

In the present invention, the first nozzle provided at the tip of the injection liquid tube is located near the lower end of the hollow outer tube, and the second nozzle provided at the tip of the high-pressure water tube is located a predetermined distance above the first nozzle. When the injection liquid pipe and the high-pressure water pipe are raised together with the hollow outer pipe, the jet water jetted at high pressure from the second nozzle cuts a predetermined amount of the ground directly above the injection part of the liquid grout from the first nozzle. Then, by discharging this excavated soil to the outside through the earth discharge pipe and sealing high-pressure air airtightly into the space formed through the air pipe,
The liquid grout material is injected into the excavation space from the first nozzle that rises following the second nozzle while preventing the excavation space from collapsing.

During the above operation, the air supplied from the air pipe is prevented from rising inside the hollow outer pipe by the first sealing means, and the air supplied from the air pipe is prevented from rising inside the pipe by the first sealing means. The second sealing means prevents air from flowing out into the atmosphere through the gap.

Therefore, the air supplied from the air pipe accumulates in the soil excavated by the jet water, further increasing the flying distance of the jet water. That is, since the jet water is injected in the air region in the ground, the effective range increases dramatically.

As a result, the injection distance of the liquid grout material that is then injected from the first nozzle is increased.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The figure is a longitudinal cross-sectional view of a main part showing one embodiment of the injection injection device according to the present invention, and the injection injection device A is buried and propelled into the target ground B to a predetermined depth by appropriate means. A hollow outer tube 1 indicating the state,
The hollow outer tube 1 includes an injection liquid tube 2, a high-pressure water tube 3, an air tube 4, an earth removal tube 5, a first sealing means 6, and a second sealing means 7, which are arranged inside the hollow outer tube 1.

The hollow outer tube 1 is rotatably and slidably fitted into the support tube 8 near the surface of the ground B, and in this embodiment, it is rotated by a driving means (not shown) provided at the upper part of the hollow outer tube 1. The bit 9 provided at the tip is pushed to a predetermined depth while removing the ground B.

The injection liquid tube 2 has a first nozzle 10 provided on the side surface near the tip thereof, which is disposed within the narrow diameter tube 1a at the tip of the outer tube 1, and is formed at a corresponding position on the side wall of the narrow tube 1a. Liquid grout can be injected and injected from the hole 11 in a direction substantially perpendicular to the axial direction of the outer tube 1.

Further, in this embodiment, a bottom nozzle 13 is provided below the first nozzle 10 via a valve 12, and when the bit 9 is propelled, high-pressure jet liquid or the like can be injected to increase the propulsion ability.

The first nozzle 10 may be one that injects only liquid grout material such as cement milk at high pressure, or may be one that simultaneously injects high-pressure air from around the liquid grout material to further enhance the injection injection ability. It's okay if it's hot. In either case, the liquid grout material or the liquid grout material and high-pressure air are pumped from a pumping means such as a high-pressure pump or an air compressor (not shown) connected to the upper end of the injection liquid pipe 2.

A second nozzle 14 is provided at the tip of the high-pressure water pipe 3 at a predetermined distance above the first nozzle 10 of the injection liquid pipe 2, and a second nozzle 14 is provided at a corresponding position on the side wall of the outer pipe 1. From the hole 1b, the first
High-pressure fresh water can be jetted in the same direction as the jetting direction by the nozzle 10. Note that the high-pressure fresh water is fed through an appropriate pressure-feeding means (not shown) connected to the upper end of the high-pressure water pipe 3.

The air pipe 4 has an open end 4a disposed near the second nozzle 14, and high-pressure air is fed from a pressure feeding means such as an air compressor connected to the other end of the air pipe 4. . The soil removal pipe 5 is arranged so that its open end 5a is in approximate contact with a level surface 15, which will be described later, and a predetermined number of flapper valves 16 provided in the middle of the pipe allow only upward movement of the soil. It is set up.

The partition wall 6 as the first sealing means has the injection liquid pipe 2, the high-pressure water pipe 3, the air pipe 4, and the soil discharge pipe 5 passed through the partition wall 6 in an airtight manner as shown in the figure, thereby sealing the top and bottom of the partition wall 6. This prevents the high pressure air fed from the air pipe 4 from escaping upward.

Further, the fixed base as the second sealing means 7 has a disc-shaped main body 7a airtightly fitted to the outer periphery of the support tube 8, and double annular claws 7b fixed in the ground B. This prevents the high pressure air supplied by the air pipe 4 from leaking to the outside through the gap between the outer peripheral surface of the outer pipe 1 and the surrounding ground.

Note that a second tube is also provided at the joint between the outer tube 1 and the support tube 8
Seal material 17 and O-ring 1 as sealing means
8 is attached, and a shell body 19 is fitted below the support tube 8 to a predetermined depth on the outer periphery of the outer tube 1, and also serves as a second sealing means to prevent leakage of the high pressure air to the outside. ing. Further, in the figure, 20 is a bearing, and 21 is a soil removal hole formed in the outer tube 1.

Next, the operation of this embodiment will be explained.

When the outer tube 1 is buried in the ground B to the predetermined depth shown in the figure, high-pressure air is forced into the outer tube 1 from the open end 4a of the air tube 4, and the air pressure lowers the level surface 1.
5 down to the position shown.

In this state, the outer tube 1 is gradually pulled upward at a predetermined speed by the driving means.

Also, while the injection liquid pipe 2, high pressure water pipe 3, air pipe 4, and soil removal pipe 5 are linked to the upward movement of the outer pipe 1,
From the first nozzle 10, the liquid grout material or the grout material is injected into the water together with high-pressure air using a high-speed jet flow, and while cutting the target ground B, the soil and liquid grout material are stirred and mixed and solidified to achieve a predetermined solidification. The body gradually forms upwards.

On the other hand, the second nozzle 14, in conjunction with the first nozzle 10, jets high-pressure fresh water onto the target ground to excavate the ground, and the crushed soil is removed by the water injected from the soil removal hole 21. By the pressure of high-pressure air from the air pipe 4, the open end 5a of the earth removal pipe 5
It passes through the flapper valve 16 and is discharged to the outside. The level plane 15 in the hole is always at the open end 5 of the earth removal pipe 5.
Maintain position a. Therefore, in the cut portion by the second nozzle 14, a gap 22 having a predetermined distance in the jet ejection direction is gradually formed upward.

High-pressure air is supplied to the void 22 from the air pipe 4, and the first and second sealing means 6, 7 airtightly fill the void 22 and spread it into the surrounding ground. By applying a predetermined pressure, it is possible to prevent the surrounding ground from collapsing.

Since water is always present below the opening end 5a of the earth removal pipe 5, when the first nozzle 10 rises to a predetermined distance and reaches the lower end of the gap 22 formed in advance by the second nozzle 14, Since the level surface 15 also rises accordingly, the void 22 where the first nozzle 10 is located is always filled with groundwater as the first nozzle 10 rises. Considering that the ground to be cut has already been horizontally excavated by the second nozzle 14 by a predetermined distance, the effective range of the liquid grout injected from the first nozzle 10 is underwater injection. Despite this, it has been significantly improved compared to the previous model, and has become the first
The horizontal distance of the solid body formed by the nozzle 10 is greatly expanded.

Alternatively, a lower pressure may be required to form a compact with the same horizontal distance as before.

Therefore, the number of solids etc. that can be formed by such a single injection injection operation can be considerably expanded compared to the conventional method, so the number of operations for embedding the hollow outer tube 1 and injection injection of liquid grout material has been reduced. It is possible to significantly improve work efficiency and reduce work costs.

Although this embodiment mainly describes the case of forming a solid body in the vertical direction, the present invention is not limited to this, and the formation of a solid body in the horizontal direction or the formation of a solid body in the hollow outer tube 1 and the first
By rotating or swinging the nozzle 10, the second nozzle 14, etc. together, the present invention can also be applied to pile construction in columns or groups. In this case, the first
It is desirable that the second nozzles 10 and 14 are attached so as to face in opposite directions.

〔Effect of the invention〕

As described above, the present invention includes a hollow outer pipe that is buried to a predetermined depth in the target ground, and a first nozzle disposed inside the hollow outer pipe and provided at the tip of the pipe to inject liquid grout into the predetermined ground below the level level. An injecting liquid pipe that injects and injects the liquid grout material at high pressure, or injects and injects the liquid grout material together with high pressure air jet, and a second nozzle provided at the tip thereof is located a predetermined distance within the hollow outer tube from the first nozzle. a high-pressure water pipe that is arranged above and can inject high-pressure fresh water and excavate a predetermined amount of ground directly above the injection injection part of the first nozzle;
An air pipe that supplies and fills high-pressure air into the space excavated by the nozzle, and an air pipe that is provided in the hollow outer pipe and dissipates the high-pressure air in the tip region beyond the opening of the air pipe to the upper part of the hollow pipe. a first sealing means for preventing the above-mentioned hollow outer tube from being exposed to air; a second sealing means for preventing high-pressure air from leaking to the outside through a gap between the outer circumferential surface of the hollow outer pipe in the ground and the surrounding ground; and an earth discharge pipe for discharging crushed soil during excavation to the outside. Since the first nozzle and the second nozzle are configured to move upward together with the outer tube at the predetermined distance and perform the predetermined spraying operations, the grouting material from the first nozzle is different from that of the conventional method. By forming a predetermined gap directly above the injection by the second nozzle in advance, the effective range can be significantly improved even when the first nozzle is used for underwater injection. Further, the above-mentioned effect becomes more accurate because the above-mentioned void is filled with high-pressure air to prevent the surrounding ground from collapsing until the first nozzle rises.

Therefore, since the efficiency per operation can be set very high, the operation time can be shortened and construction costs can be reduced.

[Brief explanation of drawings]

The figure is a longitudinal cross-sectional view of essential parts showing an embodiment of the injection injection device according to the present invention. [Explanation of symbols of main parts] A... Injection injection device, B... Ground, 1... Hollow outer tube, 2... Injection liquid pipe, 3... High pressure water pipe, 4... Air pipe, 5... ...Earth removal pipe, 6...First sealing means, 7...Second sealing means, 10...First nozzle, 14...Second nozzle,
22...Void part.

Claims (1)

[Claims] 1 A hollow outer pipe is buried to a predetermined depth in the target ground, and liquid grout is injected at high pressure into the predetermined ground below the level level from a first nozzle installed inside the hollow outer pipe and provided at the tip. Alternatively, an injection liquid pipe that injects and injects the liquid grout material together with a high-pressure air jet, and a second nozzle provided at the tip thereof are arranged a predetermined distance above the first nozzle in the hollow outer tube, and the liquid grout is high-pressure. A high-pressure water pipe capable of injecting fresh water and excavating a predetermined amount of ground directly above the injection injection part of the first nozzle, and an air pipe supplying and filling high-pressure air into the space excavated by the second nozzle.
a first sealing means provided in the hollow outer tube to prevent high-pressure air in the distal end area from the opening of the air tube from escaping upward in the hollow tube; and the hollow outer tube is embedded. The hollow outer tube is rotatably and slidably supported in the opening of the target ground, and the high pressure air supplied from the air tube connects the outer peripheral surface of the hollow outer tube in the ground with the surrounding ground. The first nozzle and the second nozzle are connected to the outer tube at a predetermined distance, the first nozzle and the second nozzle are connected to the outer tube at a predetermined distance. An injection injection device characterized in that the injection injection device is configured to perform the above-mentioned predetermined injection operations while moving upward together with the injection device.