JP3623009B2 - Method of fixing casing pipe for inclinometer and grout device used therefor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is a technology for fixing a casing pipe in the ground by inserting a casing pipe for an inclinometer into a borehole drilled into the ground, filling a gap between the borehole wall and the casing pipe with a grout material, and solidifying it. It is about. More specifically, the present invention relates to a borehole wall through a grout hose and a coupler device by combining a male coupler provided at the lower end of the casing pipe with a weight and a female coupler provided at the lower end of the grout hose. The present invention relates to a technique for injecting a grout material into a gap between a casing pipe and a casing pipe.
[0002]
[Prior art]
2. Description of the Related Art An insertion-type in-hole inclinometer is conventionally known as a device for measuring the amount of horizontal movement in the ground with high accuracy. This device installs an inclinometer casing pipe in the ground, inserts an inclinometer probe therein, and measures the inclination of the inclinometer probe (inclination of the casing pipe) at a predetermined depth. The horizontal displacement of the ground when the hole bottom is taken as the fixed point can be obtained. A plurality of guide grooves extending along the axial direction are formed on the inner surface of the casing pipe for the inclinometer, and on the other hand, the inclinometer probe provided with the sensor for detecting the inclination angle is provided with wheels, The wheels are fitted and guided in the guide groove, so that the directions of the casing pipe and the inclinometer probe are always matched. This type of in-hole clinometer is used, for example, in landslide surveys to detect the position of a slip surface and to measure the amount of landslide displacement in the ground, to elucidate the landslide mechanism and to design / construction management / effects of countermeasures This greatly contributes to confirmation.
[0003]
In this measurement, it is important to ensure that the ground deformation is correctly transmitted to the casing pipe. For this purpose, the gap between the borehole wall and the casing pipe is completely filled with the grout material to solidify the grout material. Therefore, it is necessary to fix the casing pipe to the ground.
[0004]
Conventionally, for example, the following method has been used to fix between the borehole wall and the casing pipe with a grout material.
(1) A method of holding a grout hose along the outside of the casing pipe, inserting it into the borehole, and pouring the grout material using the hose.
(2) By inserting a casing pipe into the boring hole, providing a valve at the lower end of the boring rod, inserting the boring rod into the casing pipe, and pressing the lower end of the boring rod against the bottom of the casing pipe Open the valve and inject grout material through the boring rod.
(3) After inserting the casing pipe with the seal packing on the inner side in the vicinity with the lower end open, the grout material is injected from the upper end of the casing pipe and discharged from the lower end opening into the hole. A method of filling the inside, then inserting a piston into the casing pipe, press-fitting fresh water from the upper end of the casing pipe, and pushing down the piston until it reaches the sealing packing (see Japanese Patent Laid-Open No. 61-56730).
[0005]
[Problems to be solved by the invention]
In the method (1), a grout hose is placed outside the casing pipe, so that a large bore bore is required, and not only is the cost and time required for excavation, but also the amount of grout material required. There are many disadvantages. In addition, if the diameter of the bore hole to be drilled is reduced by narrowing the hose, the hose is likely to be clogged, and the grout operation may be impossible.
[0006]
In the method (2), if the clearance between the casing pipe and the boring rod is small, the boring rod cannot be inserted if the casing pipe is bent even slightly. When a thick casing pipe is used so as to increase the clearance, a bore hole having a large diameter must be excavated, which is expensive and time consuming. Further, since the boring rod is inserted while being added, there is a possibility that the grout material leaks from the joint, and if it leaks, it adheres to the inner surface of the casing pipe and solidifies, and there is a problem that the inclinometer probe cannot be inserted. Further, in this method, when the depth of the boring hole is increased, it is not only troublesome to insert the boring rod into the casing pipe while adding the boring rod, but also the insertion itself becomes very difficult.
[0007]
In the method (3), since a plurality of guide grooves are formed on the inner surface of the casing pipe, the shape of the piston is complicated and it is difficult to manufacture. When the piston is pushed down, the grout material may remain on the inner wall of the casing pipe. If the grout material remains on the inner wall of the casing pipe, the inclinometer probe may not be inserted. There is. Furthermore, this method also makes it very difficult to push the piston to the bottom of the casing pipe when the depth of the borehole is increased.
[0008]
The object of the present invention is to eliminate the disadvantages of the prior art as described above, and the borehole to be drilled may be as small as possible so long as the inclinometer casing pipe can be inserted, and the inclinometer casing pipe is also necessary. The diameter of the grout material does not have to be larger than that described above, and the required amount of grout material can be filled between the borehole wall and the casing pipe while keeping the inside of the casing pipe clean. It is to provide a technology for fixing. Another object of the present invention is that a necessary amount of grout material can be filled between the borehole wall and the casing pipe using the grout hose in the casing pipe while keeping the inside of the casing pipe clean. Is to provide a device.
[0009]
[Means for Solving the Problems]
The present invention is a method for fixing a casing pipe to the ground by inserting a casing pipe for an inclinometer into the borehole, filling a gap between the casing pipe and the borehole wall with a grout material, and solidifying it. A male coupler incorporating a self-closing valve mechanism is attached to a grout discharge passage formed at the lower end of the casing pipe. On the other hand, at the lower end of the hose for grouting, a weight, a female coupler that incorporates a self-closing valve mechanism that can be connected to and disconnected from the male coupler, and a coupler device comprising a male coupler and a female coupler are locked. An unlocking member corresponding to the mechanism is attached. Then, after inserting the casing pipe into the boring hole, the grout hose is inserted into the casing pipe, the female coupler is connected to the male coupler using the weight drop force, and the grout material is passed through the grout hose. The grout material is discharged into the gap between the casing pipe and the borehole wall through the coupler device and the grout discharge flow path, and after filling the gap with the grout material, the grout hose is directed upward. The locking mechanism of the coupler device is removed by applying a force to lift the unlocking member, and the grout hose is pulled up.
[0010]
Moreover, this invention is an apparatus which fills the grout material in the clearance gap between the casing pipe for inclinometers inserted in the boring hole, and the boring hole wall. This device is configured to block a bottom block provided so as to block the lower end of the casing pipe, a flow path for discharging grout from the upper end of the bottom block to the outer peripheral surface, and an opening on the outer peripheral surface of the flow path. A check valve mechanism comprising a rubber tube provided on the outer periphery of the bottom block, a male coupler installed so as to be connected to the flow path on the upper end surface of the bottom block, a grout hose inserted into the casing pipe, A weight provided at the lower end portion of the hose for the grout and a female side coupler that can be connected to and disconnected from the male side coupler, and a claw portion that hangs downward from the weight and engages with a locking mechanism of the coupler device. An unlocking member is provided. The female coupler can be connected to the male coupler by using the drop force of the weight, and the locking mechanism of the coupler apparatus can be released by the claw portion by applying an upward force to the grout hose.
[0011]
[Action]
The weight attached to the lower end of the grout hose applies a downward force to the female coupler when inserted, and the grout hose is flexible when the female coupler falls toward the male coupler. However, it is possible to connect to the male coupler. The grout material injected from the hole into the grout hose is discharged from the vicinity of the lower end of the casing pipe through the grout hose and the coupler device, and fills the gap between the borehole wall and the casing pipe. If the injection is stopped when the grout material reaches the hole and an upward force is applied to the grout hose, the unlocking member releases the locking mechanism of the coupler device, and the female coupler is disconnected, so the grout hose Can be raised. Since both the male coupler and the female coupler have a built-in self-closing valve mechanism, there is no possibility that the grout material leaks into the casing pipe. If the grout material is solidified in this state, the casing pipe is firmly and securely fixed to the ground, and preparations for measurement by the inclinometer probe are completed.
[0012]
【Example】
FIG. 1 is a process explanatory view showing an embodiment of the method of the present invention. First, the boring hole 10 is excavated (see FIG. A). The depth of the boring hole 10 varies depending on the measurement application, but usually reaches a depth of about 200 m from a few meters when it is shallow. The bore diameter of the bore hole 10 may be a dimension that allows the inclinometer casing pipe to be inserted, and is preferably as small as possible. An inclinometer casing pipe 20 is inserted into the drilled borehole 10 to the bottom of the bore (see B in the figure). The casing pipe 20 is provided with a male coupler 24 incorporating a self-closing valve mechanism on a bottom block 22 at the lower end thereof, and a grout discharge flow path 26 in the bottom block 22 so as to communicate with the male coupler 24. It is the structure which formed.
[0013]
Next, a grout hose 30 is prepared as shown in FIG. The grout hose 30 has a length that reaches at least the upper end from the upper end of the casing pipe 20, and has a self-closing valve mechanism that can be connected to and disconnected from the weight 32 and the male coupler 24 at the lower end portion. The structure includes a built-in female-side coupler 34 and an unlocking member (not shown) corresponding to the locking mechanism of the coupler apparatus including the male-side coupler 24 and the female-side coupler 34. Such a grout hose 30 is inserted into the casing pipe 20.
[0014]
When the drop force of the weight 32 at the lower end portion of the grout hose 30 is used to make it close to free fall in the vicinity of the lower end portion of the casing pipe 20, the female side coupler 34 is lowered toward the male side coupler 24. Are automatically connected (see FIG. D). As a result, the grout hose 30 and the flow path 26 of the bottom block 22 communicate with each other. In this state, as shown in Fig. E, by injecting the grout material from the hole side through the grout hose 30, the grout material is discharged out of the casing pipe 20 through the coupler device and the flow path 26, The gap between the casing pipe 20 and the wall surface of the boring hole 10 is filled. By injecting the grout material 12 until it reaches the hole of the boring hole 10, the gap is completely filled with the grout material 12. Then, an upward force is applied to the grout hose 30 to lift the unlocking member to remove the locking mechanism of the coupler device, and the grout hose 30 is pulled up so that only the casing pipe 20 remains in the boring hole 10. (See Fig. F). When the grout material 12 is solidified, the casing pipe 20 is firmly and securely fixed to the ground.
[0015]
FIG. 2 is an explanatory view showing an embodiment of the grout device according to the present invention, and shows a state in which a grout material is injected by connecting a male coupler and a female coupler. FIG. 3 is a detailed view of the coupler device incorporated therein, in which A shows a disconnected state and B shows a connected state.
[0016]
This grouting apparatus is an apparatus for filling a grouting material into a gap between an inclinometer casing pipe inserted into a boring hole and a boring hole wall. A bottom block 22 provided so as to close the lower end portion of the casing pipe 20, a grout discharge passage 26 that descends from the upper end of the bottom block 22 and reaches the outer peripheral surface, and an opening at the outer peripheral surface of the flow passage 26 A check valve mechanism comprising a rubber tube 28 provided on the outer periphery of the bottom block 22 and a male-side coupler 24 installed so as to be continuous with the flow path end of the upper end surface of the bottom block 22. Furthermore, a grout hose 30 to be inserted into the casing pipe 20, a weight 32 provided at the lower end of the grout hose, a female side coupler 34 that can be connected to and disconnected from the male side coupler 24, and the weight 32 A cylindrical unlocking member 38 having a claw portion 36 that is suspended downward from the lower end and engages with the locking mechanism of the coupler apparatus is provided.
[0017]
The grout hose 30 has a structure in which a long grout hose main body portion 30 a and a short connection hose portion 30 b positioned therebelow are connected by a connecting cylinder 39. The lower end of the connection hose portion 30b is connected to the female side coupler 34. The weight 32 has a cylindrical shape, and is held so that the position in the axial direction can be adjusted by screwing with the outer peripheral surface of the connecting cylinder 39 and fixing with the holding nut 41. From the position downward, It is provided so as to cover the outside of the connection hose portion 30b. And the unlocking member 38 is hung down further from the lower end of the weight 32, and it is located so that the nail | claw part 36 of a lower end can be hooked on the lower end of the locking mechanism (sleeve 60 of the female side coupler 34) of a coupler apparatus. To do.
[0018]
As shown in FIG. 3, the coupler apparatus is a commercially available product comprising a combination of a male coupler 24 and a female coupler 34, and each has a self-closing valve mechanism with a spring inside. The male coupler 24 is provided with a valve mechanism including a coil spring 42 and a movable valve body 44 in the male coupler main body 40. When the male side coupler 24 is disconnected, the movable valve body 44 is moved by the elastic force of the coil spring 42. A closed state is maintained by pressing against the inner wall of the tip of the main body 40. The female coupler 34 is provided with a valve mechanism including a coil spring 52, a movable valve seat 54, and a fixed valve body 56 in the female coupler body 50. 54 is in pressure contact with the inner wall of the tip of the female coupler body 50 to keep it closed (see A in FIG. 3). At the time of connection, the male coupler body 40 is fitted into the female coupler body 50 to push up the movable valve seat 56, and the movable valve body 44 is pushed down by the fixed valve body 56, thereby opening and forming a flow path. (See B in FIG. 3).
[0019]
The connection between the coupler bodies is formed on the outer periphery of the female coupler body 50 and on the outer periphery of the male coupler body 40, the sleeve 60 movable in the coupler axial direction, the ball 62 held inside, and the spring 64. This is achieved by a locking mechanism formed by the annular groove 66. When the ball 62 is fitted in the annular groove 66 at the time of connection, the sleeve 60 is pushed down by the elastic force of the spring 64, and the ball 42 is pressed by the sleeve 60, so that the connected state is maintained. When separating, the sleeve 60 may be pulled out against the elastic force of the spring 64 on the inner side to free the ball 62 from the annular groove 66, thereby separating the female coupler 34 from the male coupler 24. Can do.
[0020]
Returning to FIG. 2, in order to connect the coupler device in the grouting device, the dropping force of the weight 32 may be used to drop the female side coupler 34 toward the male side coupler 24. The female coupler 34 is fitted into the male coupler 24, the ball 62 is fitted into the annular groove 66, and the sleeve 60 is pushed down by the spring 64, so that the coupling is maintained. In order to unlock the locking mechanism of the coupler device in the grout device after the grout material has been injected, the claw portion 36 of the unlocking member 38 is hooked on the lower end of the sleeve 60 and an upward force is applied to the grout hose 30. Good. If the connecting hose portion 30b of the grout hose 30 is slightly slackened (or the stretchability of the connecting hose portion 30b itself may be used), an upward force is applied to the grout hose 30 to slightly increase it. However, the unlocking member 38 is raised and the claw portion 36 lifts the sleeve 60 of the locking mechanism. As a result, the ball 62 comes out of the annular groove 66 of the male coupler 24 and is unlocked. Thereafter, the female coupler 34 is separated from the male coupler 24 by further raising the grout hose 30.
[0021]
【The invention's effect】
As described above, the present invention lowers the grout hose in the inclinometer casing pipe, connects the lower end of the hose and the bottom of the casing pipe by the coupler device, and injects the grout material through the grout hose and the coupler device to form a bore Since it is a method of filling the gap between the wall and the casing pipe, the bore diameter of the borehole to be drilled only needs to be such that the casing pipe can be inserted, so that the bore diameter can be made small, thereby reducing costs and working time. be able to. In addition, since a hose is used to inject the grout material, even if the casing pipe is slightly bent or deep, it can be easily inserted to the bottom without any problem. Then, a necessary amount of grout material can be filled between the borehole wall and the casing pipe, and the ground and the casing pipe can be reliably fixed. Further, unlike the boring rod, the grouting hose does not need to be added and has a continuous structure. Therefore, the grouting material does not leak out from the intermediate portion, and there is no possibility that the inner surface of the casing pipe is soiled.
[Brief description of the drawings]
FIG. 1 is a process explanatory diagram showing a method of the present invention.
FIG. 2 is an explanatory view showing an embodiment of a grout apparatus used in the present invention.
FIG. 3 is a detailed view of a coupler apparatus incorporated therein.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Boring hole 12 Grout material 20 Casing pipe 22 Bottom block 24 Male side coupler 26 Grout discharge flow path 30 Grout hose 32 Weight 34 Female side coupler

Claims (2)

In the method of fixing the casing pipe to the ground by inserting a casing pipe for an inclinometer into the borehole and filling and solidifying the grout material in the gap between the casing pipe and the borehole wall,
A male coupler with a built-in self-closing valve mechanism is attached to the grout discharge passage formed at the lower end of the casing pipe,
On the other hand, at the lower end of the hose for grouting, a weight, a female coupler that incorporates a self-closing valve mechanism that can be connected to and disconnected from the male coupler, and a coupler device comprising a male coupler and a female coupler are locked. Attach the unlocking member corresponding to the mechanism,
After inserting the casing pipe into the borehole, insert the grout hose into the casing pipe, connect the female coupler to the male coupler using the drop force of the weight, and pass the grout material through the grout hose. By injecting, the grout material is discharged into the gap between the casing pipe and the borehole wall through the coupler device and the grout discharge flow path, and after the grout material is filled with the gap, upward force is applied to the grout hose. A method for fixing a casing pipe for an inclinometer, wherein the unlocking member is lifted by removing the locking mechanism of the coupler device and lifting the grout hose. A device that fills the gap between the inclinometer casing pipe inserted into the borehole and the borehole wall with grout material,
A bottom block provided so as to close the lower end of the casing pipe, a grout discharge passage extending from the upper end of the bottom block to the outer peripheral surface, and an opening on the outer peripheral surface of the flow passage. A check valve mechanism comprising a rubber tube provided on the outer periphery, a male coupler installed so as to be continuous with the flow path end of the upper end surface of the bottom block, a grout hose inserted into the casing pipe, and the grout A weight provided at the lower end of the hose and a female-side coupler that can be connected to and disconnected from the male-side coupler, and an unlocking unit that has a claw portion that is suspended downward from the weight and engages with a locking mechanism of the coupler device. Comprising members,
A grout device that can connect the female coupler to the male coupler by using the drop force of the weight, and can release the locking mechanism of the coupler device by the claw portion by applying an upward force to the grout hose.

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