JPS6255316A - Method and apparatus for forming continuous horizontal columnar wall - Google Patents

Abstract

PURPOSE:To prevent the upheaval of the ground by excess soil by a method in which a hardener, water, and air are jetted from the tip of a triple tubular rotary rod and excess soil is directed from the tip opening of the rod to the soil discharge path of the triple tube and discharged by the actions of water and air. CONSTITUTION:A triple tubular rotary rod 1 is penetrated into a target ground while being turned, a hardener is jetted out of the jet nozzle 4 of a perforated valve 2, and water and air are jetted out of a jet nozzle 5. The hardener is diluted by water and air jetted and mixed with soil grains promotionally and excess soil is directed from the tip opening 26 into the soil discharge path 6. The excess soil is then sent through the discharge soil guide path 19 of the triple tube and discharged through a soil discharge hose 21. The occurrence of upheaval of the ground due to excess soil can thus be prevented and a continuous columnar wall can be formed in the horizontal direction.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apparatus and method for constructing a continuous cylindrical wall in the horizontal direction, in which the reciprocating movement of a rotating rod is performed smoothly, and the influence of upheaval etc. on the surrounding ground is prevented. provide something that does not affect

<Prior art> In general, continuous cylindrical walls are widely constructed for the purpose of strengthening soft ground such as sandy soil, gravelly soil, and clay soil, or to stop water from leaking or springing ground. It is.

Currently, the conventional construction method for continuous cylindrical walls is to spray a hardening agent such as cement milk at high pressure from a rotating rod, mix soil particles and the hardening agent, and create a continuous cylindrical wall.
p method (Chemical Churning-Fi)
le or Chemical-Churnin8Patt
ern method).

<Problems to be solved by the invention> When constructing a continuous cylindrical wall in the vertical direction using this CCP construction method, the excavated hole polled at a predetermined depth is relatively stable, and Even if the hardening agent is injected while the rod is rotated and raised, the excess soil generated around the rod will be removed upward to some extent through the gap between the rod and the excavated hole.

However, when constructing a cylindrical wall in the horizontal direction,
Once polled, the excavated hole collapses from the upper wall side due to the action of gravity, so there is no place for the excess soil to escape, and this excess soil presses against the soil around the rod, adding pressure and burying water pipes, gas pipes, etc. Lifting things up or raising the surface of the earth has negative effects.

Moreover, the dynamic pressure acting on the rod further increases due to the pressure applied to the periphery, and tightening increases the force (so-called germishing), making it impossible to smoothly reciprocate the rotating rod, especially pulling it back out.

<Means for Solving the Problems> The present inventor has proposed that by using a triple pipe for the rotating rod, making the inside of the rod a sludge drainage passage, and using a combination of water and air discharge in addition to hardening agent injection, the sludge removal effect can be improved. We have newly discovered that this can be carried out smoothly, and have completed the method of the present invention as well as an apparatus for carrying out the method.

That is, to describe using FIGS. 1 to 8 corresponding to the embodiment, the tip side 1a of the rotating rod 1 capable of rotating horizontally reciprocating
A perforated valve 2 is connected to the perforated valve 2, an outlet guide hole 3 is formed at the base end 11 of the perforated valve 2, and an injection hole 4 and a discharge hole 5 are connected to the perforated valve 2.
and a guide passage 6 are provided in parallel, and the injection hole 4, the discharge hole 5, and the guide passage 6 are provided in each of the triple tubes of the rotating rod 1.
A device for creating a continuous horizontal cylindrical wall in which the guide passage 6 is connected to the outlet guide hole 3, a curing agent is flowed through the injection hole 4, water and air are flowed through the discharge hole 5, and the guide passage 6 is connected to each other.
By removing mud from the perforated valve 2, the hardening agent is injected at high speed to the side of the perforated valve 2, and while discharging water and air around the valve 2, the rotating rod 1 is moved horizontally, and the area around the rod is The soil is stirred and kneaded by spraying a hardening agent from the front to the back, and the excess soil is removed from the mud removal passage 6 along the rotating rod 1 to the ground surface around the base end 1b of the rock l'1.
This is a method of creating continuous horizontal cylindrical walls.

<Function> The water and air discharged from the discharge hole 5 soften and stir the excess soil around the rotating rod, and guide it smoothly into the guide passage 6 in the perforated valve 2.

Further, the hardening agent injected from the injection hole 4 breaks down the surrounding soil, stirs and kneads it, and creates a pile-shaped hardened wall.

Moreover, since the hardening agent is diluted by the water coming out of the discharge hole 5, even if the hardening agent is introduced into the rod as mud is removed,
It will not stick to the inner wall of the rod and impede the mud removal action.

<Effects of the invention> Even when constructing a horizontal cylindrical wall, excess soil is smoothly removed through the rotating rod, so no extra pressure is applied to the surrounding ground, and there is no need to heave the ground or push up buried objects. It is possible to prevent this from happening and keep the ground stable.

Furthermore, since excess soil is removed from the surrounding ground and the dynamic pressure applied to the rotating rod is suppressed, the rod can be pulled back smoothly and continuous walls can be built easily and quickly.

Moreover, the existing boring machine used in the conventional CCP construction method can be used, and the triple pipe rod connected with the prescribed perforation valve can be replaced with a single pipe rod, and water and air can be pumped with a pump or compressor. The structure of the device is relatively simple, and cylindrical walls can be constructed at low cost.

<Example> Hereinafter, an example of the creation apparatus of the present invention will be described based on the drawings, and a specific creation method will also be described.

Fig. 1 is a longitudinal sectional front view of the main part near the tip of the rotating rod, Fig. 2 is a sectional view taken along line II-]I, Fig. 3 is a cutaway perspective view of the main part of the perforated valve, and Fig. 4 is a left side view thereof. FIG. 5 is a schematic vertical sectional view of the entire rotating rod, and FIGS. 6 to 8 are explanatory diagrams sequentially showing the steps for implementing the method for creating a cylindrical wall.

(Horizontal cylindrical wall creation device) A rotating rod 1 having a triple-pipe structure is attached to a power unit 10 equipped with a high-pressure pump so as to be able to freely rotate and horizontally reciprocate.
Three rubber hoses 12, 13, and 14 are connected to the base end side 1a of the rubber hose 12, 13, and 14 via swivels 11.

A curing agent is poured into one of the rubber hoses 14, water is pumped into one of the remaining two hoses 12, and air is pumped into the other one 13 with a compressor.

The rotating rod 1 is a triple tube consisting of an inner tube 15, a middle tube 16, and an outer tube 17, and has a mud remover 18 at one end 1b, and
A perforated valve 2 is connected to each of the other ends 1a, a hardening agent is fed to the inner rod pipe 15, water and air are fed to the middle pipe 16, and the outer pipe 17 is used as a mud removal guide path 19.

In this case, the curing agent transfer pressure is 150 to 300 kg/cm
2. Water pressure is less than 10kg/am2, air pressure is approximately 7kg/am2.
cm2 is preferred.

The mud scavenger 18 has a bearing 2 on the rotating rod outer tube 17.
The sludge removal guide hole 3 formed in the rod pipe 17 and the sludge removal port 18a of the sludge removal man 18 are connected to each other through the rod pipe 17 so as to be mutually transferable. is discharged from the mud removal hose 21.

The perforation valve 2 is composed of an outer cylinder 7, a cylindrical transfer part, and a bit 9, and a bit 9 having a triangularly pointed tip protrudes in the radial direction on the distal end side of the outer cylinder 7. A cylindrical transfer portion 8 is loosely fitted into the center of the outer cylinder 7, with the base end serving as a reinforcing rib 22.

An injection hole 4 is formed in the center of the transfer section 8, and this injection hole 4
Four discharge holes 5 are made around the periphery.

The injection hole 4 is bent in an L-shape along the reinforcing rib 22 from a portion 8a near the lower end of the transfer, and opens into the outer cylinder side wall 10, and the outlet 5a of the discharge hole 5 is inclined toward the injection hole opening 4a. give direction.

In this case, the outer periphery of the transfer part 8 inside the outer cylinder 7 forms an open-air-shaped mud removal guide passage 6 from the base end 7a to the tip 7b of the outer cylinder 7, and the hardening agent is injected from the injection hole 4. This will serve as a passageway to guide the excess soil that has been eroded away.

A check valve 23 is provided in the discharge hole 5 to prevent backflow of soil particles around the rod.

Then, the perforated valve 2 is removably screwed onto the rotating rod 1, the outer cylinder 7 of the valve 2 is connected to the rod outer tube 17, the discharge hole 5 of the transfer section 8 is connected to the rod inner tube 16, and the The injection holes 4 are communicated with the rod inner tubes 15, respectively.

Reference numeral 24 denotes an O-ring that tightly seals the transfer portion 8, the rod middle tube 16, and the inner tube 15.

Hereinafter, modified examples of the device of the present invention will be described. (1) Discharge hole 5
The transfer portion 5 may be provided through the transfer portion 8 up to the distal end surface thereof, and water and air may be discharged in the length direction of the rod.

(2) Since the bit 9 may be formed in the radial direction of the outer cylinder 7, instead of being provided in a straight line in plan view as in the above embodiment, it may also be provided in a trifurcated or cross shape.

Therefore, the curing agent injection holes 4 can also be formed along the direction of each blade of the bit 9, and the transfer portion 8 may be branched in one direction to four directions.

(Method for constructing a horizontal cylindrical wall) A method for constructing a horizontal cylindrical wall using the construction apparatus thus constructed will be explained based on FIGS. 6 to 8.

(1) Connect a high pressure pump to the inner pipe 15 of the rotating rod 1,
A curing agent, water, and air are supplied to rubber hoses 12 to 14 connected to a swivel 11, and a perforated valve 2 is fixed to the tip of a rotating rod 1.

Then, the rotating rod 1 is inserted horizontally into the destination ground, and the power section is driven to slowly rotate the rod I''1 and inject hardening agent from the injection hole 4 of the perforated valve 2, and from the discharge hole 5. Discharge water and air (see Figure 6).

The curing agent can be arbitrarily selected from a suspension type such as cement milk or mortar made of a mixture of cement and sodium silicate, and a solution type made of a mixture of sodium silicate and silica sol.

This curing agent, which is injected in the radial direction of the valve 2, is
The injection pressure is used to break up and stir the ground in a certain radius around the center, and mix the hardening liquid and soil particles homogeneously.

In addition, the water and air discharged from the vicinity of the tip of the valve 2 in the direction of the injection hole opening 4a dilute the hardening agent and promote homogenization of crosstalk with soil particles. Excess soil pushed out from the surrounding ground is softened and introduced into the mud removal passage 6 through the opening 26 at the tip of the outer cylinder of the valve.

Therefore, the surplus soil is transported to the proximal end side 1b of the rod without affecting the ground around the rod, and is transferred from the outlet guide hole 3 of the rod outer pipe 17 to the mud removal device 18, and then transferred to the mud removal hose. 21 will be completely eliminated.

(2) In this way, when the rod 1 is rotated and moved forward while spraying the hardening agent, the hardening agent will harden in 30 seconds to 1 minute after spraying, so the hardening layer centered on the rotating rod 1 will be moved downward. It is possible to smoothly create a horizontal cylindrical wall extending to a predetermined depth by forming the wall continuously toward the wall (see FIG. 7).

(3) When the rotating rod 1 has moved forward to the innermost end, connect the single pipe 50 instead of the mud removal device 18, cover the rod middle pipe 16 and the inner pipe 15, and apply the hardening agent inside the rod. Instead of the tube 15, the hardening agent is fed to the rod outer tube 17, and the rod 1 is rotated back and forth while injecting hardening agent from the outer tube tip opening 26 of the perforated valve 2, thereby forming a rod insertion hole formed during the forward rotation. 27 with a curing agent (see Figure 8).

Thereafter, by repeating this construction, it is possible to build a continuous wall by sequentially bringing adjacent horizontal cylindrical walls into close contact with each other, thereby strengthening or improving the ground.

As described above, the method for creating a horizontal cylindrical wall of the present invention is applied to strengthen the ground and stop water by forming continuous pillars of cylindrical plates underground. protection,
It can be applied to prevention of road subsidence, ground improvement for shield intubation, etc.

Furthermore, since the construction device of the present invention connects a predetermined perforation valve to a rotating rod with a triple-pipe structure, it can be applied to both the procedure of constructing a horizontal cylindrical wall from the front to the back, or the reverse procedure. It goes without saying that it can be done.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the main part near the tip of the rotating rod, Fig. 2 is a sectional view taken along the line ■-■, Fig. 3 is a cutaway perspective view of the main part of the perforated valve, and Fig. 4 is its left side view. FIG. 5 is a schematic longitudinal sectional view of the entire rotating rod, and FIGS. 6 to 8 are explanatory diagrams of the procedure for implementing the method for creating a cylindrical wall.

Claims (1)

[Claims] 1. A perforated valve 2 is connected to the distal end side 1a of a rotary rod 1 capable of rotating and horizontally reciprocating, and a guide hole 3 is connected to the proximal end side 1b thereof.
The injection hole 4, the discharge hole 5, and the guide passage 6 are formed in parallel in the perforated valve 2, and the injection hole 4, the discharge hole 55, and the guide passage 6 are formed in each of the triple tubes of the rotating rod 1. A continuous horizontal cylindrical wall forming device 2 is characterized in that the guide passage 6 is connected to the outlet guide hole 3, and the perforation valve 2 is composed of an outer cylinder 7, a transfer part 8, and a bit 9. A transfer part 8 is attached to the center of the cylinder 7 in a loosely fitted manner, a sharp plate-shaped bit 9 is protruded in the radial direction on the distal end side of the outer cylinder 7, and the injection hole 4 and the discharge hole 5 are arranged in parallel to the transfer part 8. One end 4a of the injection hole 4 is opened in the outer cylinder side wall 10, and one end 5a of the discharge hole 5 is opened near the tip of the transfer part 8, and the outer circumference of the transfer part 8 is opened inside the outer cylinder 7. The continuous horizontal cylindrical wall forming device 3 according to claim 1, characterized in that the guide passage 6 formed in the outer cylinder 7 extends from the base end 7a to the tip 7b of the outer cylinder 7 in an open-air shape. A continuous horizontal column wall forming apparatus 4 according to claim 1 or 2, characterized in that the outlet 5a of the injection hole 4 is oriented obliquely to the opening 4a of the injection hole 4, and the rotating horizontal reciprocating device 4 A perforated valve 2 is connected to the tip side of a rotating rod 1 having a triple pipe structure configured to move, and a curing agent injection hole 4, an auxiliary water and air discharge hole 5, and a sludge drainage passage 6 are connected to the perforated valve 2 in parallel. A curing agent injection hole 4, an auxiliary discharge hole 5, and a sludge drainage passage 6 are connected to each of the triple pipes of the rotating rod 1, respectively, so that the curing agent is injected at high speed to the side of the perforated valve 2, In addition, while discharging water and air around the valve 2, the rotary rod 1 is moved horizontally to mix and knead the soil around the rod by spraying hardening agent from the front to the back, and removes excess soil. A method for constructing a continuous horizontal cylindrical wall, characterized by continuously constructing a horizontal cylindrical wall from the passage 6 along the rotating rod 1 to the ground around the base end 1b of the rod 1.