JP3000081B2 - Injection stirring method and injection stirring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a ground improvement method for improving a target ground prior to construction work, by injecting a ground hardening material from an operation rod fed into the ground, thereby forming a ground and a ground hardening material. The present invention relates to a jet stirring method and a jet stirring device for constructing an improved body.

[0002]

2. Description of the Related Art In general, in construction work, in order to improve soft ground prior to the main work, it is usual to impregnate the ground with a hardening material for hardening a target ground. 2. Description of the Related Art In recent years, as a temporary construction, a jet agitating method of injecting a hardening material and air at high pressure into the ground to create a pile-like solid has been widely used.

[0003] An apparatus used in such a jet stirring method will be briefly described with reference to FIG. This device includes a dedicated machine 200 for raising and lowering and rotating a spindle, and a multi-tube rod (operating rod) 2 supported on a spindle of the dedicated machine 200.
01, a high-pressure pump 204 for pumping the hardening material mainly composed of cement mixed by the mixer 202 and the agitator 203 at a high pressure, a compressor 206 for mixing air into the hardening material fed from the high-pressure pump 204, and a pump. Water tank 20 for supplying water to mixer 202
7.

A multi-tube rod 20 supported on a spindle
1 is fed into the ground of a predetermined depth and is pulled up while being rotated. Then, a ground hardening material as a hardening material is jetted from a nozzle provided at the tip of the multiple pipe rod 201, and an improved ground and a ground hardened material are constructed. At this time,
The hardening material injected into the ground from the nozzle of the multiple pipe rod 201 by the high-pressure pump 204 is impregnated into the ground while stirring the ground to form a pile composed of the soil and the hardening material. Further, a part of the injected hardening material is discharged outside through a hole formed when the operating rod is advanced. The hardening material used in such a jet stirring method is mainly composed of cement, and hardens the ground by hardening the cement impregnated in the ground.

[0005] The diameter of the pile as an improved body composed of the soil and the hardening material is determined by the reaching distance of the hardening material injected into the ground from the nozzle of the multiple pipe rod 201. Then, the reaching distance of the hardening material is determined by the high-pressure pump 204. Conventionally, the high pressure pump 204, which has been generally used, has a limited pump pressure, so that the pile diameter is naturally limited. In order to improve the pump pressure and the like, the present applicant has disclosed Japanese Patent Application Nos. 62-210779 and 62-2.
No. 37996, Japanese Patent Application No. 63-68882, Japanese Patent Application No. 63
-77076, Japanese Patent Application No. 63-304693, Japanese Patent Application No. 1-74176, Japanese Patent Application No. 1-102043, Japanese Patent Application No. 2-219713, and Japanese Patent Application No. 3-130809. With the ultrahigh-pressure pump according to the improved invention, the diameter of the pile is much larger than that of the conventional one, and the working efficiency is dramatically improved.

[0006]

However, the hardening material injected from the nozzle of the multi-tube rod increases the reach by increasing the pump pressure, and the pile diameter increases, but the hardening material is separated from the nozzle. Because of the diffusion at the position, the hardening material is not sufficiently impregnated in the vicinity of the multi-tube rod, so that the ground improvement is insufficient in the vicinity of the operation rod. For this reason,
When the injection amount of the hardening material is increased, the amount of the hardening material discharged to the outside without being used increases, which is uneconomical and causes a problem of a disposal place.

[0007] The present invention solves the above-mentioned problems, efficiently injects the ground hardening material, minimizes the eccentricity of the operating rod due to the pressure reaction at the time of the injection, averages the forming accuracy and strength of the improved body, It is an object of the present invention to provide a jet stirring method and a jet stirring device capable of constructing an improved body having a large diameter.

[0008]

SUMMARY OF THE INVENTION The present invention has the following construction to solve the above-mentioned problems.

[0009] Oite to claim 1, the operating rod which is composed of multiple pipe is KyuSusumu in ground, with pulled while rotating the operating rod, and composed mainly of cement from the injection nozzle provided to the operation rod Injecting the ground hardening material into the ground, constructing an improved body of soil and ground hardening material while stirring the ground, and in the spray stirring method to improve the ground, the above injection nozzle is hardened by the pressure of high pressure air. Main injection nozzle that injects material to a predetermined distance and high-pressure air
The sub-injection nozzle which injects the ground hardening material toward the closest distance from the main injection nozzle without the pressure of the main injection nozzle, and the sub-injection nozzle is directed at least two times in the opposite direction to the main injection nozzle At a predetermined distance in the axial direction.
It is arranged so as to open at a fixed angle , the ground hardening material is supplied to the main injection nozzle and the sub injection nozzle by the pressure of the ultra-high pressure pump, the ground is improved within the required radius by the main injection nozzle, and the sub The object of the present invention is to improve the ground in the vicinity of the operation rod by the injection nozzle so that the ground hardening material is uniformly impregnated in the ground within a predetermined radius. Oite in claim 2, the operating rod is pulled while being rotated with being supported on a spindle which is raised and lowered by an automatic lifting device is KyuSusumu in ground, provided at the lower end of the operating rod, and, An injection nozzle for injecting a ground hardening material containing cement as a main component into the ground is provided, and the ground hardening material is injected into the ground from the injection nozzle to construct an improved soil and ground hardening material while stirring the ground. And
In the injection stirrer for improving the ground, a main injection nozzle for injecting the ground hardening material to a distant place by the pressure of the high-pressure air to the operation rod, and only the ground hardening material near the operation rod without the pressure of the high-pressure air. co providing by shifting by a predetermined distance plurality of sub injection nozzle axially injected into
The plurality of sub-injection nozzles are provided in the opposite direction to the main injection nozzle, and the ground hardening material injected from the main injection nozzle by the pressure of the ultra-high pressure pump is injected far away. In addition, the configuration is such that the ground hardening material injected from the plurality of sub-injection nozzles is injected near the operation rod.

[0010]

[Operation] An operation rod composed of multiple pipes is fed into the ground, pulled up while rotating the operation rod, and a ground hardening material containing cement as a main component is injected from an injection nozzle provided on the operation rod to an ultra-high pressure. It is injected into the ground by the pressure of the pump. And by the main injection nozzle,
The ground hardening material is blown together with the high-pressure air to a position away from the operating rod, the ground is improved within the required radius, and the sub-injection nozzle injects the ground hardening material near the operating rod, and the vicinity of the operating rod is Improve the ground. Since the sub-injection nozzle does not involve high-pressure air, the sub-injection nozzle injects the ground hardening material toward a closer distance than the main injection nozzle to improve the ground near the operation rod. At this time, the plurality of sub-injection nozzles inject in the opposite direction to the main injection nozzle,
The deflection of the operation rod due to the reaction at the time of injection of the main injection nozzle can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a conceptual diagram showing a jet stirring device.
This device includes a motor 1 such as a motor, a main pulley 4 to which power is transmitted from a pulley 2 provided on an output shaft of the motor 1 via a V-belt 3, and a V-belt 5 from the main pulley 4. And a clutch 8 for interrupting the rotation of a main drive shaft 7 supporting the main pulley 4, and shifting the power of the clutch 8 to a third forward rotation and a first reverse rotation. A speed change mechanism 9, a sprocket 11 provided on an output shaft 10 of the speed change mechanism 9, a feed sprocket 13 connected to the sprocket 11 via a chain 12, and an output shaft for transmitting the power of the feed sprocket 13. And the output shaft 1 driven by the oil pump 6 and transmitted by the oil pump 6. Hydraulic motor 16 power is transmitted to the
And a spindle 19 that rotates forward and backward through a bevel gear 18 provided on the output shaft 14.

The spindle 19 is moved up and down by a hydraulic cylinder (not shown) driven by the oil pump 6. A rod chuck 21 for supporting a multi-tube rod 20 is provided at the lower end of the spindle 19. The multi-tube rod 20 is provided with a monitor (described later) having an injection nozzle at the lowermost end, and a multi-tube swivel (described later) serving as an inlet for the ground hardening material is connected to the uppermost end.

FIG. 2 shows an automatic lifting device for raising and lowering the spindle 19, and a hydraulic cylinder 22 serving as a driving source is driven by the oil pump 6.

The cylinder liner 23 of the hydraulic cylinder 22
Are supported by a swivel head 24, and a pipe 25 to which hydraulic pressure is applied to upper and lower portions of the cylinder liner 23,
26 is given.

A thrust yoke 29 is mounted on a piston rod 28 that supports the hydraulic piston 27, and the spindle 19 is supported on the thrust yoke 29 via a bearing 30.

The spindle 19 is provided at its upper end with a rod guide 31 of a multi-tube rod 20. A sleeve 32 is provided on the outer surface of the spindle 19, and the sleeve 32 is supported on the swivel head 24 via a bearing 33. The bevel gear 18 is mounted on the sleeve 32 via a key 34, and power for rotating the spindle 19 is transmitted to the bevel gear 18. The spindle 19 is provided so as to be slidable in the axial direction with respect to the sleeve 32, and is driven to rotate integrally with the sleeve 32.

As shown in FIG. 3, the rod chuck 21 is composed of a chuck flange 37, a chuck body 38, and a peak holder 39 which are fastened together at the lower end of a spindle 19 via bolts 35 and 36.

The peak holder 39 is fastened to the lower end of the spindle 19 with the chuck flange 37 and the chuck body 38 via a bolt 36, and a chuck piece 43 urged toward the rod hole 42 is provided on the side surface. ing. This chuck piece 43 is a chuck bush 4
The protrusion amount is adjusted by the chuck bolt 45 via the pin 4, and moves against the spring 46.

FIGS. 4 to 7 show a double tube swivel 47, a double tube rod 48 and a monitor 49 in the case of a double tube.

The double pipe swivel 47 is disposed at the uppermost end, and is used for supplying a ground hardening material such as cement milk and air from a high pressure pump and a compressor. The structure of the double pipe swivel 47 includes a cylindrical swivel body 50,
An inner tube 51 provided concentrically within the swivel body 50
It is composed of

The swivel body 50 is provided with an air supply port 52, a joint 53 at one end, and a swivel cap 54 at the other end. A bearing case 56 provided with a fixing bracket 55 is provided on the outer periphery of the swivel body 50.

The inner tube 51 includes a sealing shaft 57, a spindle inner 58, and a joint tube 59.
It is supported in the swivel body 50 via the support rings 60 and 61. The inner pipe 51 is provided with a ground hardening material supply port 62 and is connected to the double pipe rod 48 via the joint pipe 59.

The double tube rod 48 is, as shown in FIG.
It comprises an outer tube 63 and an inner tube 64 having male and female joints 63a, 63b, 64a, 64b at both ends, and are provided concentrically via a ring 65.

The connection between the uppermost double pipe rod 48 and the double pipe swivel 47 is made by screwing the joint 63 a of the double pipe rod 48 to the joint 53 of the double pipe swivel 47.

The monitor 49 is connected to the lowermost end of the double tube rod 48, and injects the ground hardening material into the ground by high-pressure air. The structure of the monitor 49 is, as shown in FIGS.
69 and joint 70 connected to male joint 63b
A nozzle body 73 provided with an injection nozzle 71 composed of a ground hardening material injection nozzle 71a and an air injection nozzle 71b, a sub 75 provided with a check valve 74, and a metal crown 76 provided at the lowermost end. Have been. The male joint 63b of the double pipe rod 48 is screwed to the sub 69 to be connected to each other. This sub 69 is
The air is supplied to the air injection nozzle 71b.

The nozzle body 73 has a main injection nozzle 71 for injecting a ground hardening material together with high-pressure air to a predetermined distance.
And three sub-injection nozzles 721, 72 for injecting only the ground hardening material toward a closer distance than the main injection nozzle 71.
2, 723, and the sub-injection nozzles 721, 72
2, 723 are provided in the opposite direction to the main injection nozzle 71, and these sub-injection nozzles 721, 722, 72
The main injection nozzle 71 improves the ground within a required radius, and the sub-injection nozzles 721, 722, 723 provide a nozzle body 73 (operation rod). The ground in the vicinity is improved. The sub injection nozzle 7
21, 722, 723 are provided on the nozzle body 73 with their positions shifted in the axial direction, and the sub-injection nozzles 721, 722, 723 have their nozzle diameters changed in accordance with the rotation direction, so that the injection amount is changed. . In other words, the sub-injection nozzles 721, 722, and 723 change the diameter of the front-side sub-injection nozzle 721 in the rotation direction to the rear side
22 and 723, and the diameter of the upper sub-injection nozzle 721 is set to be smaller than the lower sub-injection nozzle 722 and 723.
It is formed larger than the diameter of .

On the other hand, a valve seat 79 which is opened and closed by a ball valve 78 is provided at the lowermost end of the pipe 77 of the nozzle body 73 to which the ground hardening material is supplied. The check valve 74 includes a spring housing 80 screwed to the sub 75, a spring 81 provided in the spring housing 80, and a ball valve 83 urged toward the valve seat 82 by the spring 81. ing.

A screw 8 as shown in FIG. 9 is provided between the sub 75 of the monitor 49 and the metal crown 76.
4 may be connected.

The operation of the monitor 49 will be described. During feeding, the ball valve 78 is removed. Then, when the water is fed into the ground while supplying high-pressure water, the check valve 74 is opened, high-pressure water is injected from the lowermost end, and drilling is performed. When the drilling is completed, the ball valve 78 is dropped to release the valve seat 7.
9 to prevent air from escaping from the lowermost end.

Then, the ground hardening material is supplied to the pipeline 77 of the nozzle body 73 by the ultrahigh pressure pump, the ground hardening material is injected into the ground together with the air from the main injection nozzle 71, and from the sub injection nozzles 721, 722, 723. A ground hardener is injected into the ground. At this time, as shown in FIG. 10, the ground hardening material injected from the main injection nozzle 71 reaches a distant place in the ground and stirs the ground to improve the ground within a required radius. On the other hand, the sub injection nozzles 721, 72
The ground hardening material injected from 2,723 is the nozzle body 7
3 (operation rod) is agitated to improve the ground near the nozzle body 73.

The sub injection nozzles 721, 722, 72
Numerals 3 are mutually open angles, and the fuel is injected in the opposite direction to the main injection nozzle 71, so that the eccentricity of the nozzle body 73 (operation rod) due to the reaction at the time of injection of the main injection nozzle 71 can be suppressed.

As shown in FIG. 11, the injection angles of the sub injection nozzles 721, 722 and 723 are
By setting the injection angle to be wider than the injection angle, the ground hardening material can be diffused and injected from the sub-injection nozzles 721, 722, 723 to the vicinity of the nozzle body 73 (operation rod).

[0034]

As described above, the injection stirring method and the injection stirring device according to the present invention have the following effects.

According to the first aspect, an operation rod composed of multiple pipes is fed into the ground, pulled up while rotating the operation rod, and ground hardened mainly with cement is injected from an injection nozzle provided on the operation rod. Injecting the material into the ground, constructing an improved soil and ground hardening material while stirring the ground, and in the injection stirring method for improving the ground, the injection nozzle is used to set the ground hardening material by the pressure of high-pressure air. Main injection nozzle that injects to a distance and high-pressure air
The sub-injection nozzle which injects the ground hardening material toward the closest distance from the main injection nozzle without the pressure of the main injection nozzle, and the sub-injection nozzle is directed at least two times in the opposite direction to the main injection nozzle At a predetermined distance in the axial direction.
It is arranged so as to open at a fixed angle , the ground hardening material is supplied to the main injection nozzle and the sub injection nozzle by the pressure of the ultra-high pressure pump, the ground is improved within the required radius by the main injection nozzle, and the sub The ground near the operation rod was improved by the injection nozzle, and the ground hardening material was uniformly impregnated in the ground within the entire predetermined radius.Therefore, the ground hardening material was distant from the main injection nozzle to the operation rod. The ground hardening material is injected from the sub-injection nozzle to the vicinity of the operating rod, so that the ground hardening material is uniformly impregnated into the ground in a predetermined radius near the operating rod and near the operating rod, and the rigidity is improved. An improved body (pile) can be constructed. Also, since two or more sub injection nozzles are provided,
A sufficient amount of the ground hardening material can be injected in the vicinity of the operation rod, and the eccentricity of the operation rod due to a reaction at the time of injection of the main injection nozzle can be suppressed in a well-balanced manner. further,
The ground hardening material is uniformly impregnated in the ground in the entire area within a predetermined radius near the operation rod and in the vicinity of the operation rod, so that a rigid improved body (pile) can be constructed. In addition,
Since the sub injection nozzle injects the ground hardening material in the opposite direction to the main injection nozzle, the eccentricity of the operation rod due to the reaction at the time of injection of the main injection nozzle can be suppressed in a well-balanced manner. In Claim 2, an operation rod supported by a spindle which is raised and lowered by an automatic lifting device, is fed into the ground, and is lifted while being rotated, and is provided at a lower end portion of the operation rod and mainly includes cement. An injection nozzle for injecting the ground hardening material as a component into the ground, and injecting the ground hardening material into the ground from the injection nozzle, constructing an improved body of soil and ground hardening material while stirring the ground,
In the injection stirrer for improving the ground, a main injection nozzle for injecting the ground hardening material to a distant place by the pressure of the high-pressure air to the operation rod, and only the ground hardening material near the operation rod without the pressure of the high-pressure air. co providing by shifting by a predetermined distance plurality of sub injection nozzle axially injected into
The plurality of sub-injection nozzles are provided in the opposite direction to the main injection nozzle, and the ground hardening material injected from the main injection nozzle by the pressure of the ultra-high pressure pump is injected far away. Since the ground hardening material injected from the plurality of sub-injection nozzles is configured to be sprayed to the vicinity of the operation rod, the ground hardening material can be sprayed to the vicinity of the operation rod. A ground improvement material (pile) can be constructed by uniformly impregnating the ground hardening material in the ground in the entire area within the predetermined radius. In addition, a sufficient amount of the ground hardening material can be injected in the vicinity of the operation rod, and the eccentricity of the operation rod due to a reaction at the time of injection of the main injection nozzle can be suppressed in a well-balanced manner. In addition, since two or more sub-injection nozzles are provided, a sufficient amount of the ground hardening material can be injected in the vicinity of the operation rod, and the eccentricity of the operation rod due to a reaction at the time of injection of the main injection nozzle can be suppressed in a well-balanced manner.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a jet stirring device used in a jet stirring method according to the present invention.

FIG. 2 is a longitudinal sectional view showing the automatic lifting device.

FIG. 3 is a sectional view showing a rod chuck.

FIG. 4 is a vertical conceptual view showing a double pipe swivel.

FIG. 5 is a longitudinal sectional view showing a double tube rod.

FIG. 6 is a longitudinal sectional view showing a monitor.

FIG. 7 is a perspective view of the monitor of FIG. 6;

8A is a conceptual sectional view taken along line AA of FIG. 6, FIG. 8B is a conceptual sectional view taken along line BB of FIG. 6, FIG. 8C is a conceptual sectional view taken along line CC of FIG. FIG. 7D is a conceptual sectional view taken along line DD of FIG.

FIG. 9 is a longitudinal sectional view showing a screw provided between the sub of the monitor and the metal crown.

FIG. 10 is a conceptual diagram showing the operation of the injection stirring method of the present invention.

FIG. 11 is a conceptual diagram showing an operation of a jet stirring method according to another embodiment of the present invention.

FIG. 12 is a conceptual diagram showing a conventional injection stirring method.

[Explanation of symbols]

 Reference Signs List 19 spindle 20 multiple pipe rod 48 double pipe rod 49 monitor 69 sub 70 coupling part 71 main injection nozzle 721, 722, 723 sub injection nozzle 73 nozzle body

Claims (2)

(57) [Claims] 1. An operation rod composed of multiple pipes is fed into the ground, pulled up while rotating the operation rod, and a ground hardening material mainly composed of cement is ground from an injection nozzle provided on the operation rod. Injecting into the ground, constructing an improved body of soil and ground hardening material while stirring the ground, and in the injection stirring method to improve the ground, the above injection nozzle injects the ground hardening material to a predetermined distance by the pressure of high pressure air Without the main injection nozzle and high pressure air pressure
The main injection nozzle is constituted by a sub-injection nozzle for injecting the ground hardening material toward a closer distance than the main injection nozzle, and the sub-injection nozzle is provided in at least two places in a direction opposite to the main injection nozzle, and Predetermined spacing of sub injection nozzles in the axial direction
The base hardening material is supplied to the main injection nozzle and the sub injection nozzle by the pressure of the ultra-high pressure pump, and the ground hardening material is supplied by the main injection nozzle. An injection stirring method, wherein the improvement is performed and the sub-injection nozzle is used to improve the ground near the operation rod so that the ground hardening material is uniformly impregnated in the entire ground within a predetermined radius. 2. An operation rod which is supported by a spindle which is raised and lowered by an automatic lifting device, is fed into the ground, and is lifted while being rotated. The operation rod is provided at a lower end portion of the operation rod and mainly includes cement. An injection nozzle for injecting a ground hardening material as a component into the ground, and injecting the ground hardening material into the ground from the injection nozzle, constructing an improved soil and ground hardening material while stirring the ground, In the injection stirrer for improving the above, a main injection nozzle for injecting the ground hardening material to a distant place by the pressure of the high-pressure air on the operating rod, and only the ground hardening material near the operating rod without the pressure of the high-pressure air. together Tokoro with a plurality of sub injection nozzle for injecting provided by shifting in the axial direction by a predetermined distance
Arranged to open at a fixed angle , these multiple sub-injection nozzles are provided in the opposite direction to the main injection nozzle, and the ground hardening material injected from the main injection nozzle by the pressure of the ultra-high pressure pump is injected far away, Wherein the ground hardening material injected from the sub-injection nozzle is injected toward the vicinity of the operation rod.