JP2002302934A - Construction method and device for forming hardening layer using slime - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce quantity of discharged slime in injection of ground hardening material for forming a hardening material layer for the purpose of ground covering timbering, reinforcing timbering, or stopping water, in which excessive slime to be discharged over ground in such industrial waste requiring a large amount of cost for disposal, and being discharged without effectively utilizing the injected ground hardening material. SOLUTION: In a casing 11 having slit holes 12 for spouting sucked slime at a lower side part, an injection rod 2 provided with a jet nozzle 21 is inserted through the casing to a position protruded from its tip to compose an injection pipe 1, which is inserted to a specified depth in subject ground. High pressure hardening material is jetted from the jet nozzle 21, while the injection pipe is rotated to rise, so that the excessive slime rising due to ground inner pressure is sucked into the casing. It is then spouted around the casing through the slit holes to be agitated by a jet of the hardening material by the following jet nozzle 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention aims at improving soft ground, strengthening and supporting the foundation ground for building structures, or stopping water.
The injection pipe is rotated and raised while injecting high-pressure hardening material from the injection nozzle of the injection rod provided with the injection nozzle at a position protruding from the tip of the casing provided with the slit hole on the lower side, and the excess rising due to the ground pressure While sucking the slime into the casing, the slime is jetted into the casing peripheral area by the slit hole, and injected into the periphery of the excavated ground by stirring by the hardening material jet by the subsequent injection nozzle to form a hardened ground layer. The present invention relates to a method for forming a ground hardened layer and an apparatus therefor.

[0002]

Problems to be solved by the present invention
Ground hardening material injection for improving soft ground, strengthening the foundation ground for building structures, or creating a hardening material layer for the purpose of stopping water, requires the injection pressure and hardening material discharge amount with the increase in the pressure of the hardening material jet. It is becoming difficult to properly adjust the balance.

[0003] For this reason, a rise in the ground due to an increase in ground pressure or the generation of excess slime has become a problem, and in response to this, a slime discharging method of sucking excess slime and discharging it to the ground has been performed.

However, surplus slime discharged on the ground is industrial waste containing a cement component, which requires a large amount of cost for disposal, and waste that is discharged without effectively using the ground hardening material injected at an angle. There are problems to be done.

In addition, the stirring structure for injection by hardening material injection has to rely on stirring by the rotation operation of the linear hardening material jet, and there is a problem that formation of a hardening material layer by a finer stirring structure is a problem. On the other hand, there is a further problem to further reduce the amount of discharged slime.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an injection nozzle provided with an injection nozzle at a position protruding from a tip end of a casing having a slit hole on a lower side. The injection pipe is rotated upward while injecting the high-pressure hardening material from the injection nozzle of the rod, and the excess slime, which rises due to the ground pressure, is sucked into the casing, and is ejected to the casing peripheral area by the slit hole, and the subsequent injection is performed. Stirring is performed by the hardening material jet from the nozzle, and the excess slime ejected in the form of a vertical plate by the slit hole intersects with the hardening material jet from the subsequent injection nozzle to change the stirring structure and reduce the amount of discharged slime. That is, it is configured to be.

In addition, the rotating mechanism of the casing and the rotating mechanism of the injection rod are separately formed, the casing and the injection rod are separately rotatable, and the casing is rotated in the opposite direction to the injection rod. The operation of the injection rod and the operation of the injection rod are interlaced to form a new stirring structure by jet interlacing, and the discharge slime is reused to reduce the discharge amount.

Further, the injection nozzle of the injection rod is constituted by a polymerization injection nozzle comprising a nucleus nozzle and a surrounding nozzle, and the high pressure hardening material is injected from the nucleus nozzle and the inclusion fluid is injected from the surrounding nozzle. The structure is made to participate in the action of the inclusion fluid such as air.

Further, the injection port of the injection nozzle provided on the injection rod is formed in a square shape, so that the ground breaking force of the jet and the jet propulsion are increased. In other words, by controlling the shape of the jet, the corner flow abuts the corner of the injection port to reduce the injection pressure, causing a difference in injection pressure between the center flow and the corner flow, and the relative pressure between the high-pressure jet and the low-pressure jet. A vortex is generated near the boundary due to the speed difference, a low-pressure region is generated at the center of the vortex, and many cavities (cavities) are generated.

The cavity continues to grow to the contact surface between the target ground and the jet, and disappears near the contact surface between the target ground and the jet. The area of the jet acting on the target ground is expanded by the shock wave and the jet flow generated at the time of the disappearance. In addition, the ground crushing force and the jet propulsion force are generated.

Further, when the injection nozzle of the injection rod is constituted by a square polymerization injection nozzle comprising a square core nozzle and a square surrounding nozzle, each injection port of the polymerization injection nozzle is formed in a square shape. As a result, each corner flow abuts the corner of the injection port, reducing the injection pressure and creating a difference between the center flow and the center flow. A vortex is generated, a low-pressure region is generated at the center of the vortex, and a number of cavities (cavities) are generated therein, and the differential pressure jet effect and the polymerization differential pressure effect of the square core nozzle and the square surrounding nozzle are further superimposed. Thus, an extremely strong cavitation effect can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an injection pipe in which slit holes 12 for ejecting slime sucked to the lower side are provided in a staggered manner, and the lower end thereof is inserted into a casing 11 having an open lower end. The injection rod 2 provided with the injection nozzle 21 is inserted at a position opposite to the side of the flank protruding from the tip.

The casing 11 is independently rotated in connection with a rotating mechanism 22 to cover the injection rod 2 supported at its upper end by the swivel 3 from the outside, and is provided with a unique rotating mechanism 13. The part is supported by swivel 31.

When the casing 11 covers the outside of the injection rod 2 and does not perform its own rotating operation, the upper end of the casing 11 is fixedly supported on the swivel 3 and the rotating mechanism is provided. The 13 and the swivel 31 may not be provided. When the casing 11 is rotated together with the injection rod 2, the upper end of the casing 11 may be fixedly supported on the upper end of the injection rod 2.

A hardening material supply hose 23 is provided at the upper end of the injection rod 2 and communicates with the hardening material supply unit via the swivel 3. The hardening material or the hardening material is supplied to the injection rod 2 operated by a pressure feeding mechanism such as a high-pressure pump. The required materials can be selectively supplied according to the construction situation. In addition,
In the case where the injection nozzle 21 set to the injection rod is a polymerization nozzle, in the injection rod 2, corresponding separation channels are set to the core nozzle, the outer peripheral nozzle of the peripheral nozzle, and the like. .

Further, the square shape of the nozzle outlet formed in a square shape may be a triangle, a square, or a square depending on the condition of the target ground.
It is formed in a shape having corners such as a vertical rectangle and a horizontal rectangle, and each constitutes a cavitation jet having a special color.

The tip of the injection rod 2 protrudes from the open bottom of the casing 11, and an injection nozzle 21 is provided below the portion covered by the casing 11. Further, the tip of the injection rod is provided with a composite hard material as required. The injection rod and the casing are connected to each other by a connecting means at predetermined strokes.

The injection tube 1 constructed as described above is supported by an injection tube operating mechanism 6 provided in a backhoe type moving device 5 so that rotation, rotation, and vertical movement can be performed. .

First, the injection rod 1 is set on the ground to be inserted by the moving device 5 and the injection pipe 1 is rotated, and the target ground is excavated and drilled by the tip cutting blade, or the injection pipe is set to a predetermined position by other means. The injection pipe 1 is rotated up while the high-pressure hardening material is injected from the injection nozzle 21 at a predetermined depth.

The rotation of the injection pipe 1 causes the injection rod 2 and the casing 11 to rotate together and rise in the same direction. However, since the injection nozzle 21 is located below the portion covered by the casing 11, the injection nozzle 21 is blocked by the casing 11. Instead, the high-pressure hardening material jet that is jetted cuts and agitates the surrounding ground in a cylindrical shape according to the rotation trajectory of the injection pipe 1 and mixes the hardening material into the surrounding soil.

Since the casing 11 is located immediately above the injection nozzle 21, the excess slime rising due to the ground pressure generated by the high pressure injection is sucked into the gap 14 between the injection rod 2 passing through the casing 11 and the inner wall of the casing 11. Along with
This is ejected to the peripheral region of the casing by the slit hole 12, and is further agitated by the hardening material jet by the subsequent injection nozzle 21 accompanying the rise of the injection pipe 1.

That is, by injecting the high-pressure hardening material jet from the injection nozzle 21 and rotating the injection pipe 1 to retreat in the withdrawal direction, slime is injected from the slit hole 12 and the high-pressure hardening material jet stirring area A slime-mixed layer Y is formed on the upper part, and the hardening material jet by the subsequent injection nozzle 21 pierces and cuts the surrounding ground to crush the soil particles, and further, the slime-mixed layer Y is stirred to drive the injection pipe 1 into the target ground G. The hardening material injection layer X is formed in a cylindrical shape along the trajectory.

As another embodiment, when only the injection rod 2 is rotated during the injection of the hardening material and the casing 11 is not rotated, or when the casing 11 is rotated in a direction opposite to the rotation of the injection rod 2, the rod 2 is The rotation difference with the casing 11 generates a negative pressure in the gap portion 14 to facilitate the suction of the excess slime.

When the injection nozzle 21 is configured as a polymerization nozzle and the wrapped fluid of the surrounding nozzle is air,
The air lift effect increases the surging force of the surplus slime, but the presence of the slit hole 12 converts the surplus slime into slime injection power to the peripheral area of the casing 11.

Further, if the injection nozzle 21 is configured as a square nozzle, the crushing force against the surrounding ground is increased by the cavitation jet, the jet flow distance is extended, and a large-diameter hardened material layer X can be formed. .

As described above, according to the present invention, the excess slime generated due to the imbalance between the injection pressure and the discharge amount of the hardening material is positively sucked into the gap 14 between the rod 2 and the casing 11 and injected through the slit 12. Subsequent injection nozzle following the rise of the injection pipe 1 by re-spouting to the area immediately above the nozzle 21
Since it is further agitated by the hardener jet by 21 and reused as hardener, the amount of surplus slime finally discharged can be greatly reduced.

Further, the concentration of the hardening material is increased by the slime ejected from the slit hole 12 and the jet of the hardening material from the injection nozzle 21, and when the casing is rotated, the stirring density is increased by irregular stirring. A hardened material layer X can be formed.

The injection layer X formed as described above is formed by forming similar injection layers sequentially in a portion adjacent to the injection layer X as necessary and sequentially adjoining the injection layer X in a predetermined shape.
A predetermined ground hardened layer is formed.

[0029]

[Brief description of the drawings]

FIG. 1 is an enlarged side view showing a main part of a tip of an injection tube according to an embodiment of the present invention.

FIG. 2 is an overall side view showing a construction state according to an embodiment of the present invention.

FIG. 3 is an overall side view showing the construction of another embodiment of the present invention, in which the casing is rotated and fixed.

FIG. 4 is an overall side view showing a construction state of another embodiment of the present invention, in which the casing is rotated backward.

FIG. 5 is an enlarged front view of an injection rod nozzle showing an embodiment of a square nozzle.

[Explanation of symbols]

 Reference Signs List 1 injection pipe 11 casing 12 slit hole 13 injection rod rotating mechanism 14 gap between injection rod and casing inner wall 2 injection rod 21 injection nozzle 22 rotation mechanism 23 hardening material supply hose 3 swivel 31 casing swivel 4 composite hard excavation Blade 42 Rod joint means 5 Backhoe type moving device 6 Injection pipe operating mechanism G Target ground X Hardened material injection layer Y Slime mixed layer

Claims (9)

[Claims] 1. An injection rod having an injection nozzle inserted at a position protruding from the tip of a casing through a casing and inserted into a casing provided with a slit hole for ejecting slime sucked into a lower side portion. The injection pipe is inserted into the target ground to a predetermined depth, and the injection pipe is turned up while spraying the high-pressure hardening material from the injection nozzle. Slime is injected into the peripheral area of the casing and agitated by a jet of hardening material by a subsequent injection nozzle. 2. The method for forming a hardened layer using slime according to claim 1, wherein only the injection rod is rotated without rotating the casing. 3. A method for forming a hardened layer using slime according to claim 1, wherein the casing is rotated in a direction opposite to the injection rod. 4. The injection nozzle of the injection rod is constituted by a polymerization injection nozzle comprising a nucleus nozzle and a surrounding nozzle, and the high pressure hardening material is injected from the nucleus nozzle and the inclusion fluid is injected from the surrounding nozzle. , Or a method for forming a hardened layer using slime according to claim 2 or 3. 5. An injection rod provided with a hardening material injection nozzle at a position protruding from a tip of the casing by inserting the casing into a casing provided with a slit hole for ejecting suctioned slime at a lower side. An apparatus for forming a hardened ground layer in which a constructed injection pipe is supported by a drive mechanism having a forward and backward mechanism and a rotation mechanism 6. An apparatus for forming a hardened ground layer according to claim 5, wherein the casing is separated from the rotation mechanism and fixed around the injection rod, and only the injection rod is connected to the rotation mechanism. 7. The ground hardened layer forming apparatus according to claim 5, wherein a rotating mechanism of the casing and a rotating mechanism of the injection rod are separately formed, and the casing and the injection rod are separately rotatable. 8. An injection nozzle provided in the injection rod is constituted by a polymerization injection nozzle comprising a nucleus nozzle and a peripheral nozzle, and a dividing channel communicating with the core nozzle and the peripheral nozzle is provided in the injection rod. , Or claim 6, or claim 7.
The ground hardened layer forming device described 9. An injection nozzle of an injection nozzle provided on an injection rod is formed in a square shape.
An apparatus for forming a ground hardened layer according to claim 7 or claim 8.