JPH0420694A - Borehole slime removal and hole wall cleaning equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing slime from a borehole drilled in the ground and cleaning the wall of the borehole.

[Prior art] It is known that the pull-out strength of a friction pile or ground anchor is obtained by the frictional force between the friction pile and the ground, the adhesion force between the tensile steel material and the anchoring material, and the pull-out resistance between the anchor body and the anchoring ground. It is well known. To explain the following using a ground anchor as an example, a ground anchor is made by inserting a tensile material, so-called tendon, into a borehole drilled in a predetermined position and direction, injecting an anchoring material into the hole, and after curing it. This is a construction method that applies tension to the tensile material after the design strength has been achieved.

However, if slime or muddy water with high specific gravity remains in the borehole, when the fixing material is injected, the fixing material and slime may be mixed and the strength of the fixing material may not reach the designed strength, or due to the presence of slime. A desired adhesion force may not be obtained because the injection range of the fixing material is violated and the formation of a desired anchor body is inhibited.

Furthermore, if the fixing material is injected with a mud film etc. attached to the hole wall, the fixing material will be inhibited from adhering to the ground, and the tendons may be pulled out with a resistance force smaller than the pull-out resistance force of the ground.

[Problem to be Solved by the Invention] Regarding the removal of slime from a borehole, a device for inserting a pipe and discharging and removing the slime remaining at the bottom of the hole to the outside through the pipe is disclosed in Japanese Patent Publication No. 52-31645 and It is known from JP-A No. 51-111708.

However, in such known techniques, it is not possible to remove the slime and clean the pore walls using a single device, and therefore separate means must be used to clean the pore walls.

[Problems to be Solved] Accordingly, an object of the present invention is to provide a borehole slime removal and hole wall cleaning device that can perform slime removal and hole wall cleaning with a single device.

[Means for Solving the Problems] According to the present invention, there is a pipe buried to prevent ground collapse at the mouth of a borehole, a drill pipe inserted into the pipe, and a sealing fixation for sealing and fixing both pipes. a discharge pipe that is inserted into the drill pipe and has a tip protruding from the bottom of the borehole; a sealed support device that seals and supports the drill pipe and the discharge pipe, and includes an inlet and a discharge head; The discharge pipe includes a tip opening means provided at the tip of the discharge pipe to allow flow into the pipe, and an injection device provided above the tip opening means.

The tip opening means may be a stop valve or check valve equipped with a ball valve according to known technology.

Further, the injection device includes a single hole or a plurality of injection holes bored in the discharge pipe.

[Operations] In the borehole slime removal and borehole wall cleaning device configured as described above, a guide pipe is buried in the ground, a borehole is drilled with a drill pipe, and then the drill pipe is used to clean the borehole wall. is raised to the required position, the guide pipe and drill pipe are sealed and fixed using a sealing fixing device, the drain pipe is inserted into the drill pipe and the tip protrudes into the hole, the discharge head is attached to the discharge pipe, and the sealing support device is installed. The slime water is sealed and supported on the drill pipe by the discharge head, and air and water or additives are supplied simultaneously or separately from the discharge head and sprayed from the injection hole to clean the hole wall, and the slime water is discharged from the injection and discharge port. After injecting water to fill the hole, compressed fluid such as compressed air is supplied from the injection/discharge port, and the ball of the ball valve is discharged from the discharge head along with the slime water, and compressed air is discharged from the injection/discharge port. The process is completed by supplying water and discharging the muddy slime in the hole from the discharge head.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows, as an example, a case where an apparatus embodying the present invention is used to remove slime in a borehole of a ground anchor and clean the borehole wall.

This device consists of a guide pipe 1 buried in the ground to prevent the mouth of a borehole H from collapsing, a drill pipe 2 inserted through the guide pipe 1, and both pipes 1.
2, a discharge pipe 8 which is inserted into the drill pipe 2 and whose tip protrudes at the bottom of the borehole H, a sealing support device 9 which sealably supports both pipes 2 and 8, It is generally constructed of a stop valve 14 which is a tip opening means provided at the tip of the pipe 8, and an injection device 17 provided above the stop valve 14.

The sealing and fixing device 3 includes a base 4 clamped to the drill pipe 2, a screw jack 5 fixed to the base 4, a packer holder 6 with an L-shaped cross section pressed by the screw jack 5, and a packer holder 6 of the holder 6. It consists of a rubber packer 7 provided inside.

Then, by rotating the jacking hand 5a, the rubber packer 7 is pressed and both pipes 1.2 are hermetically fixed.

The sealing support device 9 includes a case 10 that is inro-fitted to the drill pipe 2 and has an inlet/outlet 11 formed therein, and a discharge pipe 8.
A seal ring 13 seals between the discharge head 12 screwed to the boss portion 10a of the case 10.

The stop valve 14 includes a valve seat portion 15 formed at the tip of the discharge pipe 8 and a ball 16 of a rubber ball valve.

The injection device 17 consists of a large number of injection holes 18, 18, . . . bored in the discharge pipe 8.

Next, an embodiment will be described.

As shown in Figure 2, after drilling the borehole H,
The drill pipe 2 is pulled up to the position where the hole wall needs to be cleaned.

Next, as shown in FIG. 3, the drill pipe 2 and the guide pipe 1 are sealed and fixed by a sealing and fixing device 3.

Next, as shown in FIG. 1, the discharge pipe 8 is inserted into the drill pipe 2, the discharge head 12 is attached to the drill pipe 2, and the discharge head 12 is sealed and supported on the drill pipe 2 by the seal support device 9.

Next, insert the ball 16 of the ball valve into the discharge pipe 8.
and supply compressed air and water from the discharge head 12,
Air and water are injected from the injection holes 18, 18... to clean the hole walls. The washed slime water is discharged from the pouring/discharging port 11.

Next, water is injected through the inlet/outlet 11 to fill the inside of the hole with water, and then compressed air or the like is supplied through the inlet/outlet 11.

Then, as shown in FIG. 4, compressed air or the like causes the ball 16 of the ball valve to flow into the discharge head 12 together with the slime water.
more excreted.

Next, after water is injected from the pouring/discharging port 11 to fill the hole with water, compressed air or the like is supplied from the pouring/discharging port 11, and the muddy slime in the borehole H is completely discharged from the discharging head 12, completing the process. do.

[Effects of the Invention] Since the present invention is configured as described above, a single device can remove slime and clean the pore walls, thereby preventing slime and muddy water from being mixed into the fixing material. , it is possible to prevent a decrease in the strength of the fixing material, and it is also possible to remove mud films and the like adhering to the hole walls, thereby preventing a decrease in the pulling resistance of the ground.

Additionally, since the muddy slime is removed from the discharge head via the discharge pipe, the flow velocity within the discharge pipe is increased to completely discharge and remove the muddy slime, especially from the shoulder area of the expanded hole, which was previously difficult to remove. can do.

In addition, mud films may adhere to the drilling walls, especially those made of clay or mudstone.
This method can be suitably applied to construction methods for constructing ground anchors on ground where muddy water with high specific gravity is likely to form.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the present invention in a cleaning state, FIG. 2 is a state when the drill pipe is pulled up, FIG. 3 is a state when the guide pipe and drill pipe are sealed and fixed, and FIG. The figure is a vertical sectional view showing the state when cleaning is performed by supplying water and air from the inlet/outlet. H...Borehole 1...Guide pipe 2
...Drill pipe 3...Sealing fixing device 8.
...Discharge pipe 9...Sealing support device 11...
・Injection/discharge port 12...Discharge head 14...Stop valve 16...Ball valve 17...
・Injection device 18... injection hole

Claims (1)

[Claims] A pipe buried to prevent ground collapse at the mouth of the borehole, a drill pipe inserted into the pipe, a sealing and fixing device for sealing and fixing both pipes, and a pipe inserted into the drill pipe with its tip at the borehole. a discharge pipe protruding from the bottom; a sealing support device that sealably supports the drill pipe and the discharge pipe and is equipped with an inlet and a discharge head; and a sealing support device provided at the tip of the discharge pipe to control the flow into the pipe. What is claimed is: 1. A device for removing slime from a borehole and cleaning a hole wall, comprising: a tip opening means for removing slime from a borehole; and an injection device provided above the tip opening means.