JP2807078B2 - Boring hole slime removal and hole wall cleaning equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for removing slime from a boring hole drilled in the ground and cleaning the hole wall.

[Prior art] The pull-out strength of friction piles and ground anchors can be obtained by the frictional force between the friction piles and the ground, the adhesion between the tensile steel material and the anchoring material, and the pull-out resistance between the anchor trunk and the anchoring ground. It is well known. The ground anchor will be described below as an example.The grant anchor inserts a tensile material, so-called tendon, into a boring hole drilled in a predetermined position and direction, injects a fixing material into the hole, cures the material, and then cures the fixing material. This method applies tension to the tensile material after the design strength is developed.

However, if high specific gravity slime or muddy water remains in the borehole, when the fixing material is injected, the fixing material and the slime are kneaded and the strength of the fixing material does not reach the design strength. When the injection range of the fixing material is violated and the formation of the predetermined anchor trunk is inhibited, the predetermined adhesive force may not be obtained.

Further, if the fixing material is injected with the mud film or the like adhered to the hole wall, the fixing material is prevented from adhering to the ground, and the tendon may be pulled out with a resistance force smaller than the pull-out resistance force of the ground.

Regarding the removal of slime from a boring hole, a device for inserting a pipe to discharge and remove slime remaining at the bottom of the hole to the outside through a pipe is disclosed in Japanese Patent Publication No. 52-31645 and Japanese Patent Application Laid-Open No.
This is known from, for example, Japanese Patent Application Laid-Open No. 1-111708.

However, in such a known technique, the removal of the slime and the cleaning of the hole wall cannot be performed by a single apparatus, and therefore, another means must be used for cleaning the hole wall.

According to the conventional apparatus, as shown in FIG. 2, a guide pipe 1 buried in the ground to prevent collapse of a mouth of a boring hole H, a drill pipe 2 inserted through the guide pipe 1, and both pipes 1 A discharge pipe 8 which is inserted through the drill pipe 2 and whose tip projects from the bottom of the boring hole H; a sealing support device 9 which seals and supports both pipes 2 and 8; A stop valve 14 which is a tip opening means provided at the tip of the discharge pipe 8 and an injection device 17 provided above the stop valve 14 are schematically configured.

The sealing and fixing device 3 includes a base 4 clamped to the drill pipe 2 and a screw jack 5 fixed to the base 4.
And a packer holder 6 having an L-shaped cross section pressed by the screw jack 5, and a rubber packer 7 provided inside the holder 6. By rotating the jack hand 5a, the rubber packer 7 is pressed to seal and fix both pipes 1 and 2.

The sealing support device 9 seals between the case 10 in which a spout and discharge port 11 is formed by being fitted into the drill pipe 2 and a discharge head 12 screwed to the discharge pipe 8 and a boss 10a of the case 10. And a seal ring 13.

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

The injection device 17 includes a large number of injection holes 18, 18.

In the apparatus for removing slime from a boring hole and cleaning the hole wall, the guide pipe 1 is installed on the ground.
And drilling the boring hole H with the drill pipe 2, then pulling up the drill pipe 2 to a position where the hole wall needs to be cleaned, and sealingly fixing the guide pipe 1 and the drill pipe 2 with the sealing fixing device 3, The discharge pipe 8 is inserted into the drill pipe 2, and its tip projects into the hole.
A discharge head 12 is attached to the drill pipe 2 and hermetically supported on the drill pipe 2 by a sealing support device 9. Air and water or additives are supplied simultaneously or independently from the discharge head 12 and jetted from an injection hole 18 to clean the hole wall. After discharging the slime water from the inlet / outlet 11, injecting water from the inlet / outlet 11 to fill the inside of the hole, and then supplying a compressed fluid such as compressed air from the inlet / outlet 11,
Thus, the ball 16 of the stop valve 14 is discharged from the discharge head 12 together with the slime water, and compressed air is supplied from the injection / discharge port 11 to discharge the muddy water slime in the hole from the discharge head 12 to complete the operation.

[Problem to be Solved by the Invention] The above proposal is effective, however, when the inclination angle of the ground anchor is not perpendicular to the inclination of the structure A, as shown in FIG. There is a case where the lower side enters the inside of the structure A. In such a case, a gap C is generated, and the rubber packer 7 cannot seal at all.

When the remaining length of the drill pipe 2, that is, the portion projecting to the ground surface is relatively long, the power clamp of the drilling machine is closer to the slope than the drill pipe 2, and the sealing support device is required unless the drilling machine is moved. 9 cannot be set.

Further, when the sealing is completely performed, the compressed air (water) without escape enters the weak line, that is, between the surface of the structure A and the surface of the ground B as shown by an arrow a as shown in FIG. Thing A
May rise from the surface of the ground B, and the structure A may be destroyed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for removing slime from a boring hole and for cleaning a hole wall, which prevents a structure from being destroyed by slime water or the like.

[Means for Solving the Problems] According to the present invention, a guide pipe buried to prevent ground collapse at the mouth of a boring hole, a drill pipe inserted through the guide pipe, and a tip inserted through the drill pipe A discharge pipe protruding from the bottom of the boring hole, a tip opening means provided at the tip of the discharge pipe to allow flow into the pipe, an injection device provided above the tip opening means, A pressurizing pipe provided around the discharge pipe and provided with sealing means for selectively sealing the gap between the hole wall of the boring hole at the tip and operating means for the sealing means; And an air supply pipe that opens into the borehole.

The tip opening means can be constituted by a stop valve or a check valve provided with a ball valve according to a known technique.

Further, the injection device is constituted by a single hole or a plurality of injection holes formed in the discharge pipe.

Further, it is preferable that the sealing means is constituted by a resilient cylindrical sealing device, for example, a rubber packer, and the operating means is constituted by a pressurizing pipe provided integrally with the rubber packer.

[Operation] In the apparatus for removing slime from a boring hole and cleaning the hole wall configured as described above, after drilling the boring hole, the drill pipe is pulled up to a position where the hole wall needs to be cleaned, and the drill pipe is removed. Set the assembly of the discharge pipe, air supply pipe and rubber packer at the bottom, place the injection device and rubber packer at the bottom of the boring hole and near the drill pipe, respectively, and inflate the rubber packer to create a gap between the hole wall and the hole. Seal.

Next, the ball of the ball valve is put into the discharge pipe, compressed air and water are supplied from the discharge pipe, the hole is washed by spraying from the injection hole, and the slime water is discharged from the air supply pipe.

Next, water is injected from an air supply pipe to fill the hole, and compressed air is supplied from the air supply pipe.

Then, the ball is discharged from the discharge pipe together with the slime water by the compressed air.

Next, water is injected from the air supply pipe to fill the inside of the hole, and then compressed air is supplied from the air supply pipe to completely discharge the muddy slime in the borehole from the discharge pipe.

During this time, since the washing device is completely sealed to the bore hole wall with a rubber packer, slime water etc. penetrates into the gap between the drill pipe and the hole wall and the area with many voids near the opening of the structure, Objects are prevented from being destroyed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 shows, as an example, a case in which a slime in a boring hole of a ground anchor is removed and a hole wall is washed by an apparatus for carrying out the present invention. In the figure, a rubber packer 22 as a sealing means is provided around the discharge pipe 8. The rubber packer 22 is connected to a pressure pipe 20 which is an operating means provided integrally with the rubber packer. An air supply pipe 23 is provided along the discharge pipe 8, and an inner end thereof penetrates the rubber packer 22 and is opened in the bore hole H. And the rubber packer
22 is selectively expanded by compressed air or the like from a pressurized pipe, and seals a gap between the discharge pipe 8 and the boring hole H.

 Next, the mode of slime removal and pore wall cleaning will be described.

After drilling the boring hole H, the drill pipe 2 is pulled up to a position where the hole wall needs to be cleaned.

Next, the discharge pipe 8, the air supply pipe 23, and the rubber packer 22 are positioned so that the injection device 17 and the rubber packer 22 are located near the bottom of the boring hole H and near the end of the drill pipe 2.
Then, the assembled product is inserted into the drill pipe 2.

Next, compressed air or the like is supplied from the pressure pipe 20 to inflate the rubber packer 22 to seal the gap between the hole wall and the discharge pipe 8.

Next, the ball 16 of the ball valve is inserted into the discharge pipe 8.
, And compressed air and water are supplied from the discharge head 12, and air and water are injected from the injection holes 18, 18,. The washed slime water is discharged from the air supply pipe 23.

Next, water is injected from the air supply pipe 23 to fill the hole with water, and then compressed air or the like is supplied from the air supply pipe 23.

Then, the ball 16 of the ball valve is discharged from the discharge head 12 together with the slime water by compressed air or the like.

Next, after water is injected from the air supply pipe 23 to fill the inside of the hole with water, compressed air or the like is supplied from the air supply pipe 23, and the muddy water slime in the borehole H is completely discharged from the discharge head 12 and completed. I do.

During this time, the slime water and the like are sealed by the rubber packer 22 in the portion inside the boring hole H. Therefore, it is possible to prevent the slime water or the like from entering between the ground B and the drill pipe 2 or into a portion having a large amount of voids near the opening of the structure A, thereby preventing the structure A from being broken.

[Effects of the Invention] Since the present invention is configured as described above,
It is possible to prevent the destruction of the structure due to intrusion of slime water or the like.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a side sectional view showing an apparatus previously proposed by the present applicant, and FIGS. 3 and 4 are defects of the apparatus shown in FIG. FIG. A: Structure, B: Ground, H: Boring hole, 1 ...
... Guide pipe, 2 ... Drill pipe, 8 ... Drain pipe, 14 ... Stop valve, 17 ... Injection device, 20 ... Pressure pipe, 22 ... Rubber packer, 23 ... Air supply pipe

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takao Ueda 2-5-14-1 Minamisuna, Koto-ku, Tokyo Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Shiro Suzuki 8-1-1 Ginza, Chuo-ku, Tokyo No. Takenaka Civil Engineering Co., Ltd. (72) Inventor Yutaka Hasegawa 8-21-1, Ginza, Chuo-ku, Tokyo (72) Inventor Akira Hashimoto 3-21-15 Asahi, Okegawa-shi, Saitama (72) Invention Toru Mukai 2-7-1 Totsuka, Kawaguchi City, Saitama Prefecture (72) Inventor Kazuo Suzuki 2-6-12-202, Kaitori, Tama City, Tokyo (72) Inventor Masashi Yamaguchi 511-1 Hanagawa, Ogawa City, Oyama City, Tochigi Prefecture 322 (56) References JP-A-55-126688 (JP, A) JP-A-3-228912 (JP, A) JP-A-52-35921 (JP, Y1) (58) Fields investigated (Int. . ^6, DB name) E21B 21/00 - 21/14 E2 1B 33/00-33/16 E21B 31/03 E02D 15/06 101 E02D 5/74-5/80

Claims (1)

(57) [Claims] 1. A guide pipe buried to prevent ground collapse at the mouth of a boring hole, a drill pipe inserted into the guide pipe, and a tip inserted into the drill pipe and protruding from the bottom of the boring hole. A discharge pipe, a tip opening means provided at a tip of the discharge pipe to allow flow into the pipe, an injection device provided above the tip opening means, and a discharge pipe provided surrounding the discharge pipe, A pressurized pipe having seal means for selectively sealing between the bore wall of the borehole and an actuating means for the seal means; and a pressure pipe provided along the pressurized pipe and penetrating through the seal means. An apparatus for removing slime from a boring hole and cleaning a hole wall, comprising an air supply pipe opening into the boring hole.