JP6795874B2 - Mud treatment equipment used in the high-pressure injection stirring method - Google Patents

Description

The present invention relates to a mud waste treatment apparatus used in a high-pressure jet stirring method for improving the ground by injecting a hardening material into the ground and stirring and mixing the material.

The high-pressure injection stirring method is known as one of the methods for improving the foundation ground and the like. The high-pressure injection stirring method is also called the jet grout method, in which the ground is cut and broken by the powerful energy obtained by applying high pressure to the fluid, and the hardened material and soil are stirred and mixed. Then, by this construction method, a columnar improved body can be created in the ground.

As described in Patent Document 1, such a high-pressure injection stirring method includes a step of building an injection pipe and a step of creating an improved body. In the process of building the injection pipe, the guide hole, that is, the guide hole is drilled to a predetermined depth in the ground by the leading conduit, and then the injection pipe is built inside the leading conduit and the leading conduit is pulled out. Is built to a certain depth. In the construction process, the injection pipe is swirled and pulled up, and at the same time, the cured material and compressed air are continuously injected from the nozzle provided in the injection pipe. As a result, the ground is cut by the swirling jet, and an improved body is created in which the hardening material and soil are agitated and mixed in the cutting region.

Japanese Unexamined Patent Publication No. 2007-7739

Here, when a swirling jet composed of a hardening material and compressed air is injected into the ground, sludge, that is, waste mud is discharged to the ground from a discharge flow path formed between the injection pipe and the guide hole. Then, in order to prevent the mud from leaking to the surroundings of the work place, the mud pit is conventionally constructed on the ground by communicating with the guide hole and digging a cloth or a jar.

On the other hand, if the work area is paved or is a concrete slab floorboard with a reinforced concrete structure, that is, in a place where it is not possible to excavate a mud pit on the ground, mud treatment with a steel box is provided. The device is installed in the work area. The box body is provided with a guide pipe attached to the upper end of the guide hole, and a sand pump is installed inside the box body to remove the mud that has flowed into the box body by the sand pump at a position away from the tank container car and the box body. It is sent to the earth and sand pit of the box, and the mud in the box is sent directly to the vacuum car.

However, the upper part of the box is open, and the mud discharged inside may scatter to the outside of the box, which may pollute the work place. Further, in order to install a large mud treatment device equipped with a box body and a sand pump arranged inside the box body in the work place, it is necessary to secure a space for arranging the sand pump in the work place. Further, if the space above the guide hole is narrow, it is not possible to secure a space for arranging the sand pump. For example, when road surface lining is applied and work is performed under the road surface lining plate, the space is narrow and it is not possible to secure an installation space for mounting the box body, and a sand pump is applied to the box body. Cannot be installed.

For this reason, in a large mud treatment device equipped with a box body as in the conventional case, the mud treatment device cannot be installed in the narrow installation space, and the mud may be scattered around the work place. Unavoidable.

The present invention has been made from the above-mentioned technical background, and an object of the present invention is to provide a technique capable of performing mud drainage treatment in a high-pressure injection stirring method by a small mud drainage treatment apparatus.

Another object of the present invention is to provide a technique in which mud does not scatter around the mud treatment apparatus.

The wastewater treatment apparatus used in the high-pressure injection stirring method of the present invention according to claim 1 has a hardened material and compressed air radially outward from the lower end of an injection pipe inserted to a predetermined depth in the ground. It is a wastewater treatment device used in the high-pressure injection stirring method to create an improved body in which the hardening material and soil are stirred and mixed in the ground by swirling and pulling up the injection pipe while injecting into the ground. A curved pipe having a guide passage formed by a mud drainage guide surface whose inner surface has an arcuate shape along the axial direction and laterally guiding the wastewater discharged from the ground , and one end of the curved pipe. A mud drainage inlet portion provided in the portion and arranged at the opening end portion of the mud drainage passage outside the injection pipe, and a mud drainage outlet portion provided at the other end of the curved pipe and opened in the lateral direction. It is characterized by having a support cylinder provided on the curved pipe and having an inner diameter smaller than the inner diameter of the curved pipe, and the injection pipe extending in the vertical direction through the curved pipe and the support cylinder. And.

The invention according to claim 2 is the mud waste treatment apparatus used in the high-pressure injection stirring method according to claim 1, wherein a connection port portion connected to the mud discharge outlet portion is provided at one end and the other end. The spout portion is provided in the portion, the inner diameter is gradually reduced from the connection port portion toward the spout portion, and the reducer is provided to increase the flow velocity of the mud flowing from the connection port portion toward the spout portion. It is characterized by.

The invention according to claim 3, Te waste sludge treatment apparatus odor used in high-pressure injection stirring method of the claim 1 or 2, wherein, provided on the support cylinder, injects water toward the waste sludge passage It is characterized by having an injection nozzle.

According to the invention according to claim 1, since the mud discharged from the ground by the high-pressure injection stirring method is guided in the lateral direction as it is by the curved pipe, it is discharged to the outside of the work place by utilizing the flow velocity of the mud. The mud can be supplied, the use of a sand pump becomes unnecessary, and the mud treatment device can be miniaturized. In addition, it is possible to prevent the waste mud from scattering around the work place.

According to the invention according to claim 2, since the flow velocity of the waste mud discharged from the curved pipe is increased by the reducer, the waste mud can be smoothly supplied to the outside.

According to the third aspect of the invention, since the drainage in the curved pipe is diluted, the drainage can be reliably supplied to the outside without the curved pipe being blocked by the drainage.

(A) to (C) are explanatory views which show step by step about the work process of the high pressure injection stirring method. It is an enlarged sectional view which shows the mud waste treatment apparatus shown in FIG. It is a partial notch enlarged front view which shows the main part of FIG. It is a top view of FIG. It is a left side view of FIG. It is sectional drawing which shows the conventional mud waste treatment apparatus.

Hereinafter, embodiments as an example of the present invention will be described in detail with reference to the drawings. In addition, in the drawing for demonstrating the embodiment, the same components are in principle the same reference numerals, and the repeated description thereof will be omitted.

First, a high-pressure injection stirring method for improving the ground will be described with reference to FIG. Here, FIGS. 1 (A) to 1 (C) are explanatory views showing step by step the work process of the high-pressure injection stirring method.

As shown in FIG. 1A, in the high-pressure injection stirring method, a boring machine M is installed at a work place, and a guide hole, that is, a guide hole H is drilled in the ground B by the tip conduit 1. A metal crown 2 is provided at the tip of the tip conduit 1, and water is discharged from the tip conduit 1 and moved downward while rotating the tip conduit 1, so that the guide hole H is a predetermined target of the ground B. Holes are drilled to depth. Under this condition, after the injection pipe 3 is built inside the tip conduit 1, the tip conduit 1 is pulled out.

As shown in FIG. 1 (B), the injection pipe 3 is mounted on the construction machine N. At the lower end of the injection pipe 3, an injection hole for injecting compressed air and a hardening material outward in the radial direction is provided, and the hardened material is injected from the injection hole into the ground B at high pressure. The pipe 3 is swiveled and driven. By pulling up and driving the injection pipe 3 while maintaining this state, as shown in FIG. 1 (C), the improved body D in which the hardening material and the soil are agitated and mixed is placed in the ground around the injection pipe 3. It is created at a predetermined depth.

When the hardened material is sprayed into the ground B, sludge, that is, mud is generated in the ground. The mud drainage flows out to the ground through a mud drainage passage 4 formed between the guide hole H and the injection pipe 3 on the outside of the injection pipe 3. In order to discharge the mud to the outside, a mud treatment device 10 is attached to the open end of the mud drain passage 4.

Next, the mud waste treatment apparatus 10 of the present embodiment will be described. Here, FIG. 2 is an enlarged cross-sectional view showing a mud waste treatment apparatus used in the high-pressure injection stirring method according to the embodiment of the present invention, and FIG. 3 is an enlarged front view of a part of a notch showing a main part of FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a left side view of FIG.

As shown in FIG. 2, the mud waste treatment device 10 of the present embodiment has a curved pipe 11 formed so as to be curved by approximately 90 degrees. A mud drainage inlet portion 12 is provided at one end of the curved pipe 11, a mud drainage outlet portion 13 is provided at the other end portion, and the mud drainage outlet portion 13 is approximately 90 degrees with respect to the mud drainage inlet portion 12. It is the angle of. The inner surface of the curved pipe 11 is formed with a mud drainage guide surface 14 having an arcuate surface shape, and the inside of the curved pipe 11 is a guide passage 15 that is smoothly curved by approximately 90 degrees.

An inlet pipe 16 inserted into the upper end of the guide hole H is connected to the mud drainage inlet portion 12, and a flange 17 provided at the mud drainage inlet portion 12 and a flange 18 provided at the inlet pipe 16 The inlet pipe 16 is connected to the mud drainage inlet portion 12, and the mud drainage inlet portion 12 is arranged at the open end of the mud drainage passage 4.

The curved pipe 11 is integrally provided with a support cylinder 21 coaxial with the mud drainage inlet portion 12, and the inside of the support cylinder 21 is connected to the guide passage 15 inside the curved pipe 11.

As shown in FIG. 3, a disk-shaped seal receiving plate 22 is welded to the end of the support cylinder 21, and an annular seal holding plate 24 and a seal receiving plate attached to the seal receiving plate 22 by bolts 23. An annular rubber packing 25 is sandwiched between the 22 and the 22.

The injection pipe 3 penetrates the portion of the support cylinder 21 and the curved pipe 11 on the mud drainage inlet portion 12 side, and the inner diameters of the seal receiving plate 22 and the seal holding plate 24 are larger than the outer diameter of the injection pipe 3. ing. The inner diameter of the rubber packing 25 is smaller than the inner diameter of the seal receiving plate 22 and the seal holding plate 24, and is in sliding contact with the outer peripheral surface of the injection pipe 3. Therefore, when the injection pipe 3 is driven to be pulled up while being rotationally driven, the rubber packing 25 comes into contact with the injection pipe 3, so that the mud that has flowed into the curved pipe 11 from the mud drainage passage 4 is inside the support cylinder 21. Even if the mud flows into the mud, the mud does not leak to the outside from the support cylinder 21, but is guided by the mud guide surface 14 and discharged from the mud outlet portion 13.

As shown in FIG. 2, a reducer 26 is attached to the mud drain outlet portion 13 of the curved pipe 11. The reducer 26 has a connection port 27 connected to the mud discharge outlet 13 and a spout 28 that is coaxial with the connection port 27 and faces the connection port 27. The connection port 27 is provided with a flange 32 that is screwed to the flange 31 of the mud drain outlet portion 13. The inner diameter of the reducer 26 gradually decreases from the connection port 27 toward the spout 28, and the mud that has flowed into the connection port 27 of the reducer 26 from the mud drain outlet 13 of the curved pipe 11 is the reducer. The flow velocity is increased inside the 26, and the water is discharged from the spout 28. The discharged mud is supplied to a container car or a sediment pit by a pipe (not shown). Therefore, the mud is discharged to the outside by utilizing the flow velocity of the mud ejected into the closed guide passage 15 formed in the curved pipe 11 without ejecting the mud into the opened mud pit. Therefore, the mud can be supplied to a predetermined collection point on the outside by the small mud treatment device 10 without using a sand pump.

As shown in FIGS. 3 to 5, a plurality of injection nozzles 33 for injecting water toward the guide passage 15 inside the curved pipe 11 are provided inside the support cylinder 21. As shown in FIG. 2, the joint 34 provided in each injection nozzle 33 is provided with an opening / closing cock 35. Then, a pressure pump (not shown) for supplying pressurized water from the outside is connected to the joint 34 by a supply hose (not shown) connected to the joint 34, and the injection nozzle 33 is directed toward the mud drainage inlet portion 12. Water is sprayed. In this way, when water is supplied toward the guide passage 15, the mud that has flowed into the curved pipe 11 from the ground is diluted in the curved pipe 11 and the mud is discharged without blocking the curved pipe 11. It is smoothly guided toward the mud drain outlet portion 13.

Here, the conventional mud waste treatment apparatus is shown in FIG. FIG. 6 is a cross-sectional view of the conventional mud drainage treatment device 40, in which the box body 41 is arranged at the work place so as to communicate with the mud drainage passage 4, and the box body 41 has an entrance inserted into the mud drainage passage 4. A pipe 42 is provided. The upper part of the box body 41 is open, and the sand pump 43 is arranged in the box body 41. The mud that has flowed into the box body 41 from the mud drainage passage 4 is sent to a tank container car (not shown) or a pipe (not shown) at a position away from the box body 41.

In this way, in the mud treatment device 40 in which the mud drain pit is formed by the box body 41 and the sand pump 43 is arranged in the box body 41, the space above the guide hole H becomes narrow. If so, the space for arranging the sand pump 42 cannot be secured.

On the other hand, in the mud treatment device 10 of the present embodiment, the flow velocity of the mud ejected toward the ground surface is used without installing a box body at the work place to form a mud pit. By changing the flow direction with the curved pipe 11, the mud can be flowed laterally to the injection pipe 3. As a result, it is not necessary to arrange the sand pump near the injection pipe 3, and the mud waste treatment device 10 can be miniaturized.

Therefore, when the distance between the ground surface of the work place and the construction machine N is narrow, or when the space under the road surface lining plate is small, the small mud treatment device 10 can be installed. Further, since the mud is guided by the curved pipe 11, it is possible to prevent the mud from scattering to the work place around the mud treatment device 10.

Although the invention made by the present inventor has been specifically described above based on the embodiments, the embodiments disclosed in the present specification are exemplary in all respects and are limited to the disclosed techniques. is not. That is, the technical scope of the present invention is not limitedly interpreted based on the description in the above-described embodiment, but should be interpreted only in accordance with the description of the claims, and the scope of claims. All changes are included as long as they do not deviate from the description technology and the technology equivalent to the above and the gist of the claims.

The mud waste treatment apparatus of the present invention can be applied to a high-pressure injection stirring method for improving the ground such as foundation ground.

3 Injection pipe 4 Mud drainage passage 10 Mud drainage treatment device 11 Curved pipe 12 Mud drainage inlet 13 Mud drainage outlet 14 Mud drainage guide surface 15 Guide passage 16 Inlet pipe 17 Flange 18 Flange 21 Support cylinder 22 Seal receiving plate 23 Bolt 24 Seal push plate 25 Rubber packing 26 Reducer 27 Connection port 28 Spout 31 Flange 32 Flange 33 Jet nozzle

Claims (3)

By injecting the hardening material and compressed air outward in the radial direction from the lower end of the injection pipe inserted to a predetermined depth in the ground, the injection pipe is swirled and pulled up to the ground. It is a mud waste treatment device used in the high-pressure injection stirring method to create an improved body in which a hardened material and soil are stirred and mixed.
A curved pipe that has a guide passage formed by a mud drainage guide surface whose inner surface is arcuate along the axial direction and guides the mud discharged from the ground in the lateral direction.
A mud drainage inlet portion provided at one end of the curved pipe and arranged at an open end of a mud drainage passage outside the injection pipe, and a mud drainage inlet portion.
A mud drainage outlet provided at the other end of the curved pipe and opened in the lateral direction,
A support cylinder provided on the curved pipe and having an inner diameter smaller than the inner diameter of the curved pipe.
The injection pipe extending in the vertical direction through the curved pipe and the support cylinder,
A mud treatment device used in a high-pressure injection stirring method, which is characterized by having. A connection port portion connected to the mud drain outlet portion is provided at one end, a spout portion is provided at the other end portion, and the inner diameter gradually decreases from the connection port portion toward the spout portion, and the connection port It has a reducer that increases the flow velocity of the mud flowing from the portion toward the spout portion.
The mud waste treatment apparatus used in the high-pressure injection stirring method according to claim 1. Provided on the support cylinder, an injection nozzle for injecting water toward the waste sludge passage,
The mud waste treatment apparatus used in the high-pressure jet stirring method according to claim 1 or 2, wherein the mud waste treatment apparatus is characterized by having.

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