JPS5830444B2 - Underground columnar solid body construction equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for building a columnar solid body by injecting a solidifying agent such as cement milk or a chemical into the ground.

BACKGROUND ART There is a known construction method in which a pipe is inserted into a guide hole drilled in the ground, and a compacting agent is injected into the soil from the pipe while the pipe is pulled up to construct a compact in the ground.

This construction method is used for many purposes, such as water stoppage work to improve the hardening of the foundation ground of existing structures, and to treat gaps in column row walls for retaining soil, and other purposes.

In this construction method, it is necessary to crush the ground into which the consolidation agent is to be injected, and to thoroughly stir the crushed ground and the consolidation agent.

In conventional construction methods, this crushing work and stirring work were performed using a jet of water, a jet of air, a jet of chemical solution, or a jet of injection liquid.

Such a jet flow is normally generated from a nozzle provided at the tip of a pipe inserted into a guide hole drilled underground.

Therefore, although the work of crushing and stirring the ground using a jet stream is relatively suitable, depending on the soil quality, clods of soil may remain, and as a result, stirring work using only a jet stream may leave clods of soil in the constructed compact, making it difficult to obtain a homogeneous solid. There was a drawback that there was no

This tendency is particularly noticeable in ground with strong adhesive strength.

Although sufficiently stirring the crushed ground can be achieved, for example, by slowing down the speed at which the pipe is pulled up, this reduces work efficiency and increases costs.

Research and development has also been carried out on a technique for performing stirring work by using a spiral blade used in a rotating earth auger or the like, and spraying a chemical liquid or the like from the side of the blade at the tip thereof.

However, in this construction method, the diameter of the guide hole to be drilled into the ground becomes large, and the cost required for drilling increases. The purpose of the present invention is to provide an apparatus for constructing a columnar solid body in the ground, which allows the diameter of the guide hole to be small and can evenly inject a solidifying agent over a wide area in a relatively short period of time.

In carrying out the present invention, a pipe-shaped consolidation agent injection device (hereinafter referred to as a monitor) is equipped with a high-pressure jet liquid for breaking the ground, such as a member that can be opened laterally and radially to each other by the pressure of water. is pivoted.

Therefore, the ground crushed by the injection of the high-pressure liquid jet is agitated by the action of the cabinet member by the rotation of the solidifying agent injection device.

According to an embodiment of the present invention, a guide hole having a diameter of approximately 20 CIrL to 30 crrL is bored in the ground where a compact is to be constructed.

A known boring machine is used to drill this guide hole.
Any device such as an earth auger or vibratory excavator can be used.

The monitor according to the present invention is attached to the tip of the pipe, inserted into the guide hole, and installed at the bottom of the hole, and then the liquid pump that supplies the high-pressure jet liquid and the surroundings of the high-pressure jet liquid injected from the nozzle are installed. A compressor is used to supply the air that is injected into the container, and a caking agent such as cement milk is supplied.

Before starting the grouting pump and spouting these fluids from each nozzle, the pipe is rotated and raised about 1 m to stir and disturb the ground around the guide hole to some extent.

When each of the pumps and compressors mentioned above is set to a predetermined pressure, a high-pressure jet of liquid is applied to the hydraulic cylinder that operates the cabinet member, and the cabinet member opens to the extent that it becomes possible. By rotating the pipe and moving it up and down and spraying high-pressure liquid as necessary, the cabinet member is set open at a predetermined angle while cutting away the ground around the guide hole.

The cabinet member is angled at a certain angle, and if the cabinet member opens the door a little, the rotating force of the monitor will apply force in the direction of opening the cabinet member, making it easier for the cabinet member to open.

In this state, the nozzle encloses the surrounding area with an air jet and injects high-pressure liquid.The high-pressure liquid crushes the ground around the guide hole, injects a solidifying agent, and rotates the pipe. pull up.

By doing this, the member is rotated in an open state at a predetermined angular position, so that the ground crushed by the high-pressure injection liquid is stirred and evenly mixed with the consolidation agent, forming a suitable columnar consolidation. It can be built underground.

As the solidifying agent used in the present invention, in addition to cement milk, for example, ettringite or a resin chemical solution can be used.

Embodiments of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a drilling device 10 is installed on the ground surface.

Then, using this drilling device 10, a guide hole 12 is bored at a position where a solid body is to be constructed.

Next, as shown in FIG. 2, a monitor 16 is attached to the tip of a pipe 14, which will be described later, and suspended by, for example, a crane 15 to near the bottom of the guide hole 12.

This pipe 14 is rotatably supported by a support device 22.

By operating the support device 22, the pipe 14 can be rotated, and by operating the crane 15, it can be moved up and down.

All of the above are known techniques, and the implementation of the present invention is not limited to the illustrated example.

FIG. 3 shows a monitor in which the present invention is implemented, and the upper part thereof has a passage 20 for high-pressure injection liquid led from a pump (not shown) in the center, and a ring-shaped A passage 22 is provided.

Compressed air from a compressor (not shown) is guided to this ring-shaped passage 22.

Furthermore, another ring-shaped passage 24 is formed on the outer periphery of the ring-shaped passage 22 via a partition wall 23, and this another ring-shaped passage 24 is filled with solidification from a grouting pump (not shown) that injects a solidification agent. agent is being introduced.

A central passage 20, a ring-shaped passage 22, and a central passage 26 of two nozzles 25a, 25b facing each other in the radial direction perpendicular to the axis of the monitor 16.
and the outer peripheral passage 27, so the nozzles 25a and 25b inject high-pressure injection liquid in opposite directions,
The high-pressure injection liquid is surrounded by a jet of air from the outer circumferential passage 27 and flies to a relatively long distance, crushing the ground outside the guide hole 12.

A hydraulic cylinder 28 is formed below these nozzles 25a and 25b.

As shown in FIG. 4, this hydraulic cylinder 28 communicates with a central passage 20, and a valve 29 is provided in the middle thereof.

Like a safety valve, this valve 29 closes the passage 20 by the action of a spring 30 and opens by the pressure of the passage 20.

This spring 30 is supported by a plug 31 screwed into the main body part B of the monitor 16.

Therefore, the high-pressure injection liquid in the passage 20 is transferred to the spring 30.
When the acting force exceeds , the valve 29 opens and high-pressure injection liquid flows into the hydraulic cylinder 28.

A piston 32 is provided within the hydraulic cylinder 28, and a piston rod 33 projects downward integrally with the piston 32.

As shown in FIGS. 3 and 5, elongated notches 34a and 34b are provided radially opposite each other, and the notches 34a and 34b are provided with cabinet members 35a and 3, respectively.
5b can be accommodated.

The cabinet members 35a and 35b are pivotally connected to the main body B by pins 36a and 36b, respectively, and the inner ends of the cabinet members 35a and 35b are connected to the piston rod 33 via link mechanisms 37a and 37b, respectively. When the members 35a and 3sb move downward in FIG. 3 due to the action of the high-pressure injection liquid, the members 35a and 3sb are connected to the pins 36a and 3, respectively.
It pivots in the direction of arrow A about 6b, and is in the open state as shown.

Although link mechanisms 37a and 37b are shown in the illustrated embodiment, the opening may be achieved by, for example, a rack and a sector gear.

The cabinet members 35a and 35b are made to have a triangular cross section as shown in FIG. 5, so that when they are slightly weighed, a component force is applied in the direction in which the cabinet members open as they rotate.

Another ring-shaped passage 24 for feeding the solidifying agent communicates with the two passages 24a, 24a as shown in FIG.
3, and communicates with a single central passageway 24b, as shown in FIG.

This central passage 24b communicates with a plurality of nozzles 38 at the lower end of the monitor 16, and the cement is injected into the ground from the nozzles 38.

Next, the operation of the apparatus of the present invention will be explained with reference to FIGS. 6 to 9.

FIG. 6 shows the pipe 14 inserted into the guide hole 12 and the monitor 16 positioned up to the bottom of the guide hole 12, as explained with reference to FIG.

Next, the members 35a and 35b are opened to stir the ground around the guide hole 12. For example, in the case of soft ground such as sludge, the pipe 14 is moved up and down and rotated by the crane 15 and the support device 11, and high pressure is applied. If the liquid is injected from the injection liquid nozzles 25a and 25b, the hydraulic cylinder 28
The cabinet members 35a and 35b can be opened relatively easily by applying hydraulic pressure to the cabinet members 35a and 35b.

However, if it is not possible to easily meet the Cabinet members,
As shown in FIG. 7, first, high-pressure injection liquid is fed, but the pressure is lower than the pressure at which the valve 29 opens.

In this way, Cabinet member 35a. The pipe 14 is moved up and down by the crane 15 and rotated by the support device 17 by a distance corresponding to the length of the pipe 35b, for example, about In.

Then, a substantially cylindrical fracture portion 40 is formed at the bottom of the guide hole 12 by the jet J of high-pressure injection liquid.

In the above work, air may be injected around the jet J of the high-pressure injection liquid to increase the flying distance of the jet J, or depending on the ground, air may not be injected.

Once the fractured portion 40 is formed at the bottom of the guide hole 12 in this way, the high-pressure injection liquid is injected at a pressure higher than the pressure at which the valve 29 opens.

The pressure of this high-pressure injection liquid can be achieved by appropriate known means such as a pressure regulating valve provided on the ground.

Then, as shown in FIG. 8, the cabinet members 35a and 35b can be easily opened within the crushing portion 40.

At the same time, the pipe 14 is pulled up while being rotated.

Note that, of course, air is injected in this process.

As shown in FIG. 9, the solidifying agent is fed from a grouting pump and injected into the fractured portion from the tip of the monitor 16 to obtain a solidified body 41.

At this time, the pipe 14 is gradually pulled up while rotating, but during this time, the high-pressure injection liquid Gen) first fractures the ground, and the crushed ground is stirred by the cabinet members, so that it is crushed as shown by the reference numeral 42 in Fig. 9. The parts become homogeneous.

As the solidifying agent is injected, the slime S comes out to the surface along the circumference of the pipe 14.

You can continue working in this way until you reach the surface.

Although the cabinet member remains open on the ground after completing the work, it can be closed by, for example, opening the drain valve and draining the liquid in the hydraulic cylinder 28.

Then insert it into the next guide hole and repeat the above steps.

As described above, according to the present invention, there is provided a cabinet which is pivotally connected to the solidifying agent injection device and can be opened laterally and has an angle advantageous in the opening direction, and a hydraulic cylinder which operates to open the cabinet. , is equipped with a passage that leads the high-pressure injection liquid to the hydraulic cylinder, and a valve that is installed in the passage that leads to the hydraulic cylinder and opens at a predetermined pressure. When this happens, the cabinet can be opened and therefore suitable stirring operations can be performed without the need for other power sources.

In addition, the physical properties and shape of the solidified body can be accurately controlled by controlling the rotation speed and pulling speed of the pipe according to the soil quality.

Furthermore, the pipe withdrawal speed and the amount of solidifying agent injected can be accurately controlled, and this control can be performed independently of the stirring operation.

Therefore, the amount of slime can be reduced and post-processing becomes easy.

Furthermore, since the ground is crushed in advance with a high-speed injection liquid, there is no need to apply large rotational torque to the opening blades, and since high-pressure injection liquid is used for the opening work by cabinet members, the entire device can be made compact, and there is no need to No special piping is required.

The combined use of air jets improves the ground crushing effect, and by simply drilling a small guide hole for inserting a pipe, it is possible to create a columnar solid body with a radius at least the same as the length of a cabinet member (diameter Approximately 2-3m).

Furthermore, if a means for discharging the pressure fluid in the hydraulic cylinder is provided, for example, a valve, it is possible to construct a plurality of columnar solid bodies only in a part of the ground, and spaced apart in the vertical direction.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a mode of drilling a guide hole according to the present invention, Fig. 2 is a side view showing a place where a pine is inserted according to the present invention, and Fig. 3 is a side view showing an embodiment of the present invention. 4 is a sectional view of the agent injection device, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a sectional view taken along line V-V in FIG. 3, and FIG.
9 to 9 are explanatory diagrams showing the construction method using the device of the present invention, and FIG. 6 shows the pipe inserted into the guide hole,
Figure 7 shows where a fractured part is formed at the bottom of the guide hole.
Figure 8 shows the enlarged part of the cabinet, and Figure 9 shows the intermediate process of building the solid body. 12... Guide hole, 14... Pipe, 16... Solidifying agent injection device (monitor), 25a, 25b... Nozzle 28... Hydraulic cylinder, 35a, 35b...
Cabinet member, 38...Nozzle for injecting solidifying agent.

Claims (1)

[Claims] 1 A pipe to be inserted into a guide hole drilled underground, a solidifying agent injection device installed at the tip of the pipe, a support device to rotate the pipe, a crane to move the pipe up and down, and a solidifying agent injection device In an underground columnar solid body construction device having a nozzle installed in the ground for injecting a high-pressure injection liquid radially outward, and a nozzle for injecting a solidifying agent attached to the tip of the solidifying agent injection device, An opening wing that is pivotally connected to a solidification agent injection device and can be opened laterally, a hydraulic cylinder that operates to open the opening wing, a passageway that leads high-pressure injection liquid to the hydraulic cylinder, and the liquid An apparatus for constructing an underground columnar solid body, comprising a valve that is provided in a passage leading to a pressure cylinder and opens at a predetermined pressure.