JP3280773B2 - Jet grouting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe provided with a submersible monitor at the bottom and a triple pipe connected to the submersible monitor in order to improve a soft ground by forming a columnar solid body in the ground. And a triple pipe swivel connected to the jet grout apparatus.

[0002]

2. Description of the Related Art First, a conventional jet grouting method will be described with reference to FIGS.

(1) Casing Pipe Building Process (FIG. 11) A casing pipe 2 is set on a boring machine 1, and the casing pipe 2 is pushed in while rotating, and drilling water is injected from a water injection hole 3 to form a metal crown at the tip. The guide hole A (FIG. 16) is drilled in
Build.

(2) Triple pipe building process (FIG. 12).

A triple pipe 6 is built with a rough terrain crane 5.

(3) Step of pulling out casing pipe (FIG. 13) The casing pipe 2 is pulled out by the rough terrain crane 5.
In some cases, the casing pipe 2 may be pulled out to a predetermined depth and left.

(4) Jet grouting process (FIG. 1)
4) The triple pipe 6 is set on the column machine 7, and the ultra high pressure water hose B and the compressed air hose C are mounted on the triple pipe swivel 8 of the triple pipe 6.
And the solidified material hose D are connected. Therefore, the triple pipe 6 is rotated by the column machine 7, and the triple pipe 6 is pulled up while jetting the jet E from the underwater monitor 16 (FIG. 2) to perform jet grouting.

(5) Triple Tube Pulling Step (FIG. 15) When the formation of the columnar consolidated body F is completed in the jet grouting step, the triple pipe 6 is pulled up.

(6) Hole Filling Step (FIG. 16) The remaining guide hole A is filled back.

[0010]

In the conventional method, in order to form the columnar consolidated body F at a large depth, it is necessary to use a long triple pipe 6.

However, a triple tube has a complicated structure, a complicated seal, and is expensive.

Therefore, there is known an apparatus in which an underwater monitor 16 is fixed to the end of a pipe, and hoses B, C and D are connected to a triple pipe swivel connected via a triple pipe.

However, the length of each of the hoses B, C, and D becomes longer, and the torsion of each of the hoses B, C, and D cannot be absorbed only by the driven rotation of the triple pipe swivel. C and D are twisted, and problems such as abrasion occur with time.

Accordingly, it is an object of the present invention to provide a jet grout apparatus which can prevent twisting of each hose connected to a triple pipe swivel.

[0015]

According to the present invention, there is provided a pipe provided with a submersible monitor at the bottom for improving a soft ground by forming a columnar solid body in the ground, In a jet grout apparatus comprising a triple pipe swivel connected via a triple pipe, an intermittent reversing mechanism for intermittently reversing the pipe every time the pipe rotates 360 degrees is provided, and the intermittent reversing mechanism comprises an intermittent reversing mechanism. A ring provided on the main body for locking the rod in the rotation direction and slidably supporting the rod in the axial direction, a ring gear fixed to the ring, a pinion meshing with the ring gear, and an oil motor for driving the pinion. ON of the proximity switch described later
An electromagnetic switching valve for switching a pump circuit and a tank circuit from an oil pump to an oil motor, and a proximity switch connected to an electromagnetic solenoid of the electromagnetic valve, wherein the proximity switch has a pair of detecting pieces including the ring and the main body. It is provided in.

[0016]

[0017]

Here, the telescopic pipe is positioned at an appropriate place in the borehole. Then, the ground is excavated by extending the first-stage pipe, and then the ground is excavated by extending the second-stage pipe. After drilling to a predetermined level, the present invention can be applied to a method of forming a columnar consolidated body at a large depth by lowering a triple pipe to the bottom of a drill hole.

The present invention is also applicable to a method of forming a columnar compact at a large depth. That is, while rotating a telescopic pipe provided with a digging means at a lower end portion, the ground is digged by a digging means (a monitor or the like), and the telescopic pipe is sequentially penetrated downward to dig to a predetermined depth. Then, ultra-high pressure water, air, and a ground improvement agent are simultaneously injected from the monitor, and the telescopic pipe is pulled up at a predetermined speed while rotating the telescopic pipe and the monitor. Thereby, a columnar consolidated body can be formed in the ground, but it is preferable to implement the present invention by such a construction method.

In this case, it is preferable that the slime is ejected to the ground from a gap between the borehole and the telescopic pipe. After construction, it is preferable to fill the hole by ejecting a ground improvement agent while lifting the telescopic pipe.

Further, as a means for injecting a ground improvement agent provided other than the telescopic pipe, a mechanism in which an injection nozzle is attached to the tip of a coiled tube is employed. First, the telescopic pipe is sequentially extended downward while rotating. And digging by the digging means at the lower end,
Thereafter, the present invention is also applicable to a method of performing processing by a mechanism using the coiled tube described above.
That is, the present invention is applied to excavation work using a telescopic pipe.

[0022]

In the jet grout apparatus of the present invention having the above-described structure, the intermittent reversing mechanism is provided on the main body of the intermittent reversing mechanism and supports the rod in the rotating direction and slidably supports in the axial direction. A ring, a ring gear fixed to the ring, a pinion that meshes with the ring gear, an oil motor for driving the pinion, and an electromagnetic switch for switching a pump circuit and a tank circuit from an oil pump to the oil motor by turning on a proximity switch. A switching valve and a proximity switch connected to an electromagnetic solenoid of the electromagnetic valve, wherein a pair of detection pieces are provided on the ring and the main body, so that the oil motor is operated to rotate the pipe. Then, the pair of detecting pieces of the proximity switch are turned on every time the pipe rotates 360 degrees. Therefore, the rod, that is, the underwater monitor is rotated by the oil motor every 360 degrees. Therefore, the twist of each hose is absorbed, and the twist is prevented.

[0023]

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

FIG. 1 shows an example of a triple pipe installation facility.

In FIG. 1, a cable 12 wound around a cable reel 11 of a crane truck 10 hangs down via a cable guide roller 13, and an end of the cable 12 has a triple pipe swivel of a triple pipe device P. 17 are suspended. The telescopic pipe 20 of the triple tube device is held by an intermittent reversing mechanism 30 provided on the front frame 14 of the crane vehicle 10.

2 and 3, at the lower end of the triple pipe 15 of the triple pipe device P, a perforation / water injection monitor 16 is provided, and at the upper end, a triple pipe swivel 17 is provided.
An ultra-high pressure water hose B, a compressed air hose C, and a solidified material hose D are connected to the triple pipe swivel 17, respectively.

The telescopic pipe 20 comprises a first-stage pipe 21 of an outer cylinder and a second-stage pipe 22 of an inner cylinder.
It is locked in the rotational direction by a plurality of intaglio portions a in the longitudinal direction (three in the example shown in the figure). And triple tube 1
5 also serves as a three-stage pipe, and the two-stage pipe 22 has
Is locked in the rotation direction.

4 to 6, the intermittent reversing mechanism 3
A ring 32 is rotatably provided on the main body 31 of the “0”. The ring 32 slidably accommodates the first-stage pipe 21 and has a concave ridge 33 which engages with a not-shown ridge of the pipe 21.
This locks the pipe 21 in the rotation direction.

A ring gear 34 is provided integrally with the ring 32, and a driver pinion 35 is meshed with the ring gear 34. The driver pinion 35 is fixed to an output shaft of an oil motor 36.

The hydraulic circuits L 1 and L 2 connected to the oil motor 36 are connected to an oil pump 39 by an electromagnetic switching valve 37.
Pump circuit LP or tank circuit LT. The detection pieces 41 and 42 of the proximity switch 40 are connected to the electromagnetic solenoid 38 of the electromagnetic switching valve 37 by electric circuits E1 and E2. One detection piece 41 is provided on the main body 31, and the other detection piece 42 is provided on the ring 32 at a position facing the one detection piece 41. And the electromagnetic solenoid 38
Switches the electromagnetic switching valve 37 in response to each ON signal of the proximity switch 40.

Next, the mode of construction will be described.

In the triple pipe building process corresponding to FIG. 12, the telescopic pipe 20 whose entire size has been reduced is aligned with the center position of the place where the drilling hole is to be drilled (FIG. 2).

Next, excavation is started using the drilling / water injection monitor 16 (FIG. 7), and the two-stage pipe 22 is extended, and the hole is drilled to a deeper position by the drilling / water injection monitor 16 (FIG. 8). The drilling operation is performed until the triple pipe 15 is extended and the drilling / water injection monitor 16 reaches a predetermined depth.

In a jet grouting process corresponding to FIG. 14, the telescopic pipe 20 is pulled up while rotating the drilling / water injection monitor 16 by operating the ol motor 36, and a jet E is jetted from the drilling / water injection monitor 16 to form a column. A consolidated body F is formed. At this time, FIGS.
As shown in FIG. 5, the oil motor 36 is rotated, and the first-stage pipe 21 of the telescopic pipe 20 is rotated (Step S).
1) When the detection pieces 41 and 42 of the proximity switch 40 coincide with each other every 360 degrees and output an ON signal (step S2 is Y)
ES), the electromagnetic solenoid 38 controls the electromagnetic switching valve 37,
The pump rotation LP and the tank circuit LT are alternately switched to the hydraulic circuits L1 and L2 or the hydraulic circuits L2 and L1 every 360 degrees, and the oil motor 36 is sequentially rotated in reverse (step S3). Thereby, the rotation direction of the perforation / water injection monitor 16 changes every 360 degrees, absorbing the twists of the hoses B, C, and D,
Prevent twisting.

Although not clearly shown in FIG. 1-10, a drilling bit or the like is provided at the tip of the drilling and water injection monitor 16, or excavation is performed by injecting high pressure water from the monitor 16 to the ground. At the same time, the ground is excavated by extending the telescopic pipe 20 downward while rotating.

[0036]

As described above, according to the present invention, the following excellent effects can be obtained. (A) Since the proximity switch is turned on by the detecting piece every time the sensor rotates 360 degrees by the intermittent reversing mechanism, the intermittent reversing operation can be automatically and reliably performed. Even if a triple swivel is used, each hose is twisted. Can be eliminated. (B) Since the intermittent reversing mechanism has a simple structure, it can be easily installed on a front frame of a crane truck or the like, and can be suitably locked by a ring that supports the triple pipe device slidably in the axial direction.

[0037]

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an apparatus for implementing the present invention.

FIG. 2 is a side sectional view showing a triple tube device.

FIG. 3 is a sectional view perpendicular to the axis of FIG. 2;

FIG. 4 is an overall configuration diagram showing an intermittent reversing mechanism.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a gear train diagram of FIG. 4;

FIG. 7 is a side sectional view showing a telescopic pipe inserted state.

FIG. 8 is a side sectional view showing a two-stage pipe extension state.

FIG. 9 is a side sectional view showing a triple pipe extension state.

FIG. 10 is an operation flowchart.

FIG. 11 is a side sectional view for explaining a casing pipe embedding step of the conventional method.

FIG. 12 is a side sectional view for explaining a triple pipe building step.

FIG. 13 is a side sectional view illustrating a casing pipe drawing step.

FIG. 14 is a side sectional view illustrating a jet grouting process.

FIG. 15 is a side sectional view illustrating a triple tube drawing step.

FIG. 16 is a side sectional view illustrating a hole filling step.

[Explanation of symbols]

 A: Guide hole B: Ultra high pressure water hose C: Compressed air hose D: Solidified material hose E: Jet F: Columnar consolidated body P: Triple pipe device 1.・ ・ Boring machine 3 ・ ・ ・ Injection hole 4 ・ ・ ・ Metal crown 5 ・ ・ ・ Rough terrain crane 6 ・ ・ ・ Triple pipe 7 ・ ・ ・ Column machine 8 ・ ・ ・ Triple pipe swivel 10 ・ ・ ・ Crane truck 11 ・ ・・ Cable reel 12 ・ ・ ・ Cable 13 ・ ・ ・ Cable guide roller 14 ・ ・ ・ Front frame 15 ・ ・ ・ Triple tube 16 ・ ・ ・ Drilling and water injection monitor 17 ・ ・ ・ Triple tube swivel 20 ・ ・ ・ Telescopic pipe 21 ・.. 1-stage pipe 22 ... 2-stage pipe 30 ... intermittent reversing mechanism 31 ... body 32 ... ring 33 ... concave groove 34 ... ring gear 35 ... drive pinion 36 ... oil motor 37 ... electromagnetic switching valve 38 ... electromagnetic solenoid 39 ... oil pump 40 ... proximity switch 41, 42 ... detection piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-119219 (JP, A) JP-A-4-189916 (JP, A) JP-A-2-279817 (JP, A) JP-A-2- 183007 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 3/12 101

Claims (1)

(57) [Claims] 1. A pipe provided with a submersible monitor at a bottom portion for improving a soft ground by forming a columnar solid body in the ground, and a triple pipe connected to the submersible monitor via a triple pipe. In a jet grouting device including a swivel,
An intermittent reversing mechanism is provided for intermittently reversing the pipe every time the pipe rotates 360 degrees. The intermittent reversing mechanism is provided on the main body of the intermittent reversing mechanism and locks the rod in the rotating direction and is slidable in the axial direction. , A ring gear fixed to the ring, a pinion that meshes with the ring gear, an oil motor that drives the pinion, and a pump circuit from an oil pump to the oil motor when the proximity switch described below is turned on. A jet grout, comprising: an electromagnetic switching valve for switching a tank circuit; and a proximity switch connected to an electromagnetic solenoid of the electromagnetic valve, wherein the proximity switch has a pair of detection pieces provided on the ring and the main body. apparatus.