JPH0745623Y2 - Grout injection pipe lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for pulling up a grout injection pipe for stepping up an injection pipe inserted in the ground at a predetermined interval for changing the injection stage.

[Conventional technology]

There are a forward method and a pull-up (step-up) method as a method for injecting a certain area in the depth direction when grouting the ground. The latter method is generally used.

Conventionally, in the latter step-up method, in order to accurately determine the step-up length and prevent the generation of the unimproved zone, the machine for installing the injection pipe is operated and the distance from the previous position to the position after the pull-up is increased. Each time, it was measured by a scale so as to be a set pulling distance, or the pulling distance was set, or the pulling distance was set only by visual observation instead of actual measurement.

In this case, a steel pipe exhibiting rigidity is used as the injection pipe,
The unit steel pipes are sequentially replenished during rotary drilling by the installation machine (boring machine) for the injection pipes, and at the time of pulling up, the unit steel pipes are sequentially removed while the unit steel pipes are removed in the pulling process for each length unit.

[Problems to be solved by the device]

However, there is a possibility that an unimproved zone may occur in the above visual observation, and the former measurement is preferable.

However, it takes a great burden for the worker to measure the step-up length with a scale each time the step-up is performed.

On the other hand, as in the conventional case, when steel pipes exhibiting rigidity are sequentially added to form an injection pipe, the attachment / detachment work needs to be linked with the operation of the boring machine, and it may not be possible to follow the hole bending. In view of the above, the present applicant previously proposed a flexible injection tube as Japanese Patent Publication No. 63-44893, and has put it into practical use based on its effectiveness. At present, this method is becoming mainstream. The greatest advantage of using this flexible injection tube is that it can be inserted and pulled up without the use of a boring machine, even if the casing is bent. This has made it possible to perform injections at multiple locations simultaneously or simultaneously.

Thus, when performing simultaneous injection, every step-up,
The actual measurement of the length increases the burden on the worker, or increases the number of workers, and the advantage of breakage is lost.

Therefore, an object of the present invention is to make the pulling operation unmanned and to make the pulling operation main body lightweight in simultaneous injection so that it can be easily transported to an appropriate position.

[Means for Solving the Problems]

The present invention, which has solved the above-mentioned problems, has a packer that expands and contracts by fluid pressure at the tip, and a flexible injection pipe that grouts in a state where the packer is expanded is inserted into the ground at a plurality of points. A device for use in a method for simultaneously injecting through respective injection tubes, wherein the injection tube has a center hole type rigidly arranged piston cylinder having a central hole penetrating along a central axis. And a lifting operation valve for this piston cylinder, and provided for the lifting portion of the piston cylinder,
A chuck cylinder that presses the chuck body against the outer circumference of the injection pipe to drive the injection pipe by chucking, a chucking operation valve for the chuck cylinder, and a step-up position for detecting the step-up position based on the stroke of the piston cylinder. A pulling operation body including an injection pipe position detector; based on a position detection signal from the injection pipe position detector,
A controller for giving the chucking actuation valve chucking of the injection pipe and its release signal and the rod actuation signal for raising and lowering the actuation valve; and the pulling action body is a target. Is installed at each injection point, and the pulling-up operation body has a weight that is portable to the injection point of interest by only human power.

[Action]

The device was developed for simultaneous injection at multiple sites. Therefore, when the injection at the plurality of simultaneous injection point groups is completed, it is necessary to move to the next other injection point. For this purpose, the weight must not be large enough to be moved by a crane as in a conventional boring machine, and must be contained in a weight that can be transported to another injection point by an operator.

Therefore, in the present invention, the weight of the pulling operation body is reduced by making the pulling operation body and the controller separate from each other, and this is made portable.

On the other hand, the present invention uses a flexible injection tube having a packer at its tip end that expands and contracts by fluid pressure, and grouts in a state where the packer is expanded. As described in the above publication, this packer is necessary to regulate the pouring position of grout, and for this purpose, it is important to step up every predetermined length.

From the standpoint of this pulling up operation, chucking of the injection pipe and its release can be performed by the chuck cylinder via the chuck body, whereby chucking can be automated. Further, since the injection pipe position detector for detecting the step-up position based on the stroke of the piston cylinder performing the lifting operation is provided, the step-up length can be detected unattended. Then, based on the signal from the injection pipe position detector, chucking of the injection pipe and its release signal to the chucking actuation valve, and the lifting signal of the rod to the lifting actuation valve are given. Automation of pulling is achieved.

Further, it is not impossible to raise and lower the piston cylinder in parallel with the injection pipe as in a reference example shown in FIG. 4 described later, but in the present invention, since the injection pipe exhibits flexibility,
If the flexible injection tube bends during the step-up process, the chuck by the chuck body may shift the axis of the injection tube, causing damage to the injection tube or hindering the step-up operation of the piston cylinder. Sometimes,
It turns out that it is not practically practical.

On the other hand, in the present invention, as the piston cylinder,
In particular, a center hole type is used, which is arranged in a solid orientation so that the injection pipe penetrates the center hole. Therefore, the flexible injection tube
Since it is always guided by the center hole and its bending is prevented, there is no deviation from the center of the drilled hole, chucking by the chuck body can be performed accurately, damage to the injection pipe is prevented, and smooth stepping is performed. Promise up.

〔Example〕

Hereinafter, the present invention will be described in more detail by way of examples with reference to the drawings.

FIG. 2 is a schematic view of the lifting device main body X, in which a center hole type piston cylinder 2 is provided so as to surround the flexible injection pipe 1, and the tip of the rod 2A thereof surrounds the injection pipe 1 with the upper chuck body 3 Upper chuck cylinders 4 and 4 for chucking via are provided opposite to each other. On the contrary, the injection pipe 1 is arranged to penetrate through the center hole (center hole) 2a of the piston cylinder 2.

On the other hand, as shown in FIG.
Is fixed to the pedestal 5, and a moving wheel 6 is attached to one side of the pedestal 5.
Is provided. A ring-shaped moving handle 7 is fixed to the upper part of the piston cylinder 2. Therefore, at the time of movement, the operator holds the handle 7 in an inclined state, and the moving wheel 6 can easily move to another injection point. Since the weight of the lifting operation body X is set to about 40 kg, for example, it is easy to transport.

Further, the chuck of the injection pipe 1 may be provided at one position in the height direction, but in order to stably chuck and move, the lower chuck body 8 is attached to the pedestal 5 below the piston cylinder 2.
Lower chuck cylinders 9, 9 for chucking via are provided opposite to each other. A cleaning nozzle 10 is provided below the nozzle 10 for cleaning mud or the like attached to the oppositely arranged injection pipe 1, and the cleaning water W is jetted from this nozzle 10 for cleaning.

The injection pipe 1 has packers 11 and 12 at the upper and lower portions of the lower end of the injection pipe 1, for example, and these packers 11 and 12 are expanded by compressed air A supplied into the pipes and brought into close contact with the hole wall of the casing pipe 13. In this state, the grout G is injected through the injection port previously formed in the casing tube 13.

On the other hand, referring also to FIG. 1, the upper chuck cylinder 4,
The piston cylinder 2 and the lower chuck cylinder 9 are each an upper chucking actuation valve 1 which is a four-way solenoid valve.
4. A common pressure source, that is, an air compressor 50 in this embodiment, is connected via a lifting operation valve 15 and a lower chucking operation valve 16. Further, these operating valves 14, 15 and 16 are fixed to the mount 5.

Further, as shown in FIGS. 1 and 3, a guide rod 18 is fixed across the upper end of the pedestal 5 and a bracket 17 fixed to the upper end of the piston cylinder 2, and a moving rod 19 is further attached to the upper end of the rod 2A. Is penetrating through the bracket 17, and a metal piece 20 is fixed to the lower end thereof. The metal piece 20 is loosely fitted on the guide rod 18. Further, an upper limit proximity switch 21 and a lower limit proximity switch 22 are fixed to the upper and lower parts of the body of the piston cylinder 2. The distance between the proximity switches 21 and 22 is preset to a predetermined step-up length, for example, 33 cm. If necessary, it is possible to change the position by changing the position of at least one of the proximity switches 21 and 22 or by changing the position in advance.

Thus, the contact / separation signal of the metal piece 20 with respect to the proximity switches 21 and 22 indicates the movement of the rod of the piston cylinder 2, so that the position of the injection tube 1 is detected based on the step-up length between the proximity switches 21 and 22. The injection tube position detector is configured with these as elements.

A pull-up controller Y is provided separately from the pull-up operation body X. Furthermore, the air compressor 50, the grout pressure pump 51, the packer actuating pump 52, and the washing water source 53 are provided separately.

The pull-up controller Y is a proximity switch together with a packer operation / release switch 30, a pressure switch 31, an air filter 32 for operating each cylinder, a pressure switch 33, an on / off solenoid valve 34 for supplying wash water, a pressure gauge 35, and the like. Based on the position detection signals from 21 and 22, chucking actuating valves 14 and 16 are given chucking of the injection pipe 1 and its release signal, and ascending and descending actuating valve 15 is given a hoisting signal of rod 2A. The control unit main body 36 having the function of is provided.

In the pulling device configured as described above, at the time of pulling up, first, the injection pump 51 is stopped and the packers 11 and 12 are stopped.
And the rod 2A is positioned at the lower limit, the actuating valves 14 and 16 are operated, the rod of the chuck cylinder 4 is extended, the rod of the chuck cylinder 9 is contracted, and injection is performed by the chuck bodies 3 and 8, respectively. Chuck and release tube 1.

Then, in this state, the piston cylinder 2 is operated via the operation valve 15 to extend the rod 2A. Along with this extension, the moving rod 19 and the metal piece 20 also rise. When the metal piece 20 reaches the position facing the upper limit proximity switch 21 by this rise, the upper limit proximity switch 21 operates, and it is detected that the rod 2A has reached the upper limit and stepped up for a predetermined length.

Thus, when a step-up is detected, the packers 11, 12 are bulged at that position and then the grout G
Is injected. At the time of this injection, chucking is performed by the chuck body 8 in order to stabilize the injection tube 1.

Further, in the next step-up, the rod 2A is lowered, and this drop is detected by the detection of the metal piece 20 by the proximity switch 22, and then the step-up is performed as described above.

In the present invention, the lower chucking means may be omitted. Further, although the proximity switch system is adopted as the position detector of the rod 2A in the above example, an optical system for optically detecting the mark of the rod 2A or the like is also possible.

On the other hand, as the piston cylinder, we initially considered the parallel system as shown in Fig. 4 instead of the center hole system, but when actually using it, there were the above-mentioned problems, and it is necessary to put it into practical use. I couldn't. Note that the structure of FIG. 4 can be immediately inferred in comparison with FIG.

[Effect of device]

As described above, according to the present invention, the pulling operation is unmanned, and in the simultaneous multi-point injection, the pulling operation main body is made lightweight, and thus it is possible to easily carry it to an appropriate position. .

In addition, the injection pipe can be securely chucked to the predetermined portion to smoothly pull up.

[Brief description of drawings]

FIG. 1 is an overall view of an example of the present invention, FIG. 2 is a schematic vertical sectional view of a pulling-up main body, FIG. 3 is a half sectional front view showing details thereof, and FIG. 4 is a schematic vertical sectional view of a comparative example. . 1 ... injection pipe, 2 ... piston cylinder, 2A ... rod, 3 ... chuck body, 4 ... upper chuck cylinder,
8: chuck body, 9: lower chuck cylinder, 14 ~
16 …… Operating valve, 36 …… Control main body, X …… Pulling operation main body, Y …… Pulling controller, G …… Grout, A ……
Packer actuation air, W ... Wash water.

Claims (1)

[Scope of utility model registration request] 1. A flexible injection pipe having a packer that expands and contracts due to fluid pressure at the tip, and a flexible injection pipe that grouts in a state in which the packer is expanded is inserted into the ground at a plurality of points and each injection is performed. A device used in a method for simultaneously injecting through a pipe, wherein the injection pipe has a center-hole type rigidly arranged piston cylinder having a central hole penetrated along a central axis, and the piston. An operating valve for raising and lowering with respect to the cylinder, and provided for the raising and lowering portion of the piston cylinder,
A chuck cylinder that presses the chuck body against the outer circumference of the injection pipe to drive the injection pipe by chucking, a chucking operation valve for the chuck cylinder, and a step-up position for detecting the step-up position based on the stroke of the piston cylinder. A pulling operation body including an injection pipe position detector; based on a position detection signal from the injection pipe position detector,
A controller for giving the chucking actuation valve chucking of the injection pipe and its release signal and the rod actuation signal for raising and lowering the actuation valve; and the pulling action body is a target. The pulling-up operation main body has a weight that can be carried to the target injection point only by human power, and the pulling-up device for the grout injection tube is characterized in that: