JP3877377B2 - Muddy water ejection prevention device during anchor hole drilling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing muddy water ejection during anchor hole excavation.
[0002]
[Prior art]
The construction of the anchor anchor is generally performed in the order of drilling → solidification material injection → steel wire insertion → casing pipe drawing / solidification material pressure injection → tension / fixation. Of these, drilling is usually performed by attaching a bit to the tip of the casing pipe and rotating the casing pipe while adding it.
[0003]
[Problems to be solved by the invention]
When drilling or pulling out the casing pipe, drilling mud is ejected from the base of the hole, so that workers and peripheral materials and equipment become dirty and the scaffolding becomes loose, and the working environment is significantly deteriorated.
[0004]
OBJECT OF THE INVENTION
The present invention has been made in order to solve the above-described problems, and is a muddy water ejection prevention device during excavation of an anchor hole that can prevent ejection of drilled mud water and improve the working environment. The purpose is to provide.
[0005]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the present invention is provided outside of the hole of the anchor hole and prevents the drilling mud from being blown out so that the outer peripheral surface of the drilling casing pipe can be stopped. In the apparatus, a holding body that is installed at the mouth portion of the anchor hole and penetrates the casing pipe, and that holds the gap between the inner peripheral surface of the pipe body and the outer peripheral surface of the casing pipe so as to be able to stop water. And an outer packing that elastically connects the drainage pipe and the holding pipe while interposing the drainage pipe and the holding pipe between the drainage pipe and the holding pipe. An apparatus for preventing muddy water ejection during excavation of an anchor hole, characterized in that it is connected to the casing pipe so as to be able to swing eccentrically by means of an outer packing sandwiched therebetween.
[0006]
In addition, the present invention provides a muddy water ejection preventing device during excavation of an anchor hole, characterized in that, on the peripheral surface of the drain pipe, an injection port for a caking material is provided separately from the drain port. Further, the packing is attached to the outer peripheral surface of the holding pipe and is attached by being sandwiched between a flange projecting in the middle of the outer peripheral surface of the holding pipe and a flange projecting at the end of the drain pipe. -To provide a mud spray prevention device when drilling holes. Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
<A> Seat plate The seat plate 100 is a plate body in which a through hole 101 of a casing pipe 200 is opened at the center as shown in FIG. In the vicinity of the adjacent corners of this one surface, an L-shaped hooking bracket 102 is provided so as to face each other. Then, as shown in FIG. 1, after attaching the retaining bracket 102 to the earth wall or the like with the retaining bracket 102 facing down, the packing 110 is attached to the retaining bracket 102.
[0008]
<B> Drainage pipe The drainage pipe 300 has an inner diameter larger than the outer diameter of the casing pipe 200 as shown in FIG. , Ensure that there is no collision due to eccentric rocking during pulling.
[0009]
Flange 301 and 302 are provided at both ends of the drain pipe 300. These flanges 301 and 302 are not parallel but are inclined so that the drain pipe 300 can be installed in accordance with the drilling angle of the anchor hole 210.
[0010]
As shown in FIG. 3, large and small branch pipes 310 and 320 communicate with each other along the peripheral surface of the drain pipe 300. The drainage port 311 and the binder injection port 321 are used. In addition, screws 312 and 322 are formed on the inner peripheral surfaces of both pipes, and are configured to be freely opened and closed by screwing the plug.
[0011]
<C> The holding pipe holding pipe 400 is a pipe body that penetrates and holds the casing pipe 200 as shown in FIGS. 1 and 2, and has a flange 401 projecting along the outer peripheral surface thereof. Further, a male screw 402 for screwing a cap 610 described later is engraved on one end side of the outer peripheral surface. Further, a step surface 403 is provided in the middle of the inner peripheral surface, and a required number of inner packings 410 for water stop are provided. The inner packing 410 may be a wear resistant gland packing or the like.
[0012]
<D> Outer packing As shown in FIGS. 1 and 2, a required number of outer packings 500 are attached to the outer peripheral surface of the holding tube 400 on the side where the screw male 402 is not provided. For the outer packing 500, a member having water-stopping and elasticity such as a rubber material is used.
[0013]
Then, as shown in FIG. 1, the outer packing 500 is sandwiched between the flange 302 of the drain pipe 300 and the flange 401 of the holding pipe 400 and fastened with bolts 501, thereby connecting the drain pipe 300 and the holding pipe 400. Do. As a result, the drain pipe 300 and the holding pipe 400 can be elastically connected, and therefore it is possible to follow the eccentric oscillation that occurs when the casing pipe 200 is inserted and pulled out.
[0014]
<E> As shown in FIGS. 1 and 2, the presser tube presser tube 600 has an inner diameter larger than the outer diameter of the casing pipe 200 and is larger than the inner diameter of the holding tube 400 on which the male screw 402 is engraved. Has a small outer diameter. Further, an enlarged diameter portion 601 having an outer diameter larger than the inner diameter of the holding tube 400 on the side where the male screw 402 is engraved is provided at one end portion thereof.
[0015]
As shown in FIG. 1, the presser tube 600 presses the inner packing 410 in the holding tube 400 in the axial direction, and adjusts the contact pressure between the inner packing 410 and the outer peripheral surface of the casing pipe 200. .
[0016]
<F> As shown in FIGS. 1 and 2, the cap cap 610 has an insertion hole 612 that is larger than the outer diameter of the casing pipe 200 on the end surface 611 of the hollow cylinder whose one end is open. On the inner surface of the cylinder opposite to the end surface 611, an internal thread 613 that engages with the external thread 402 of the holding tube 400 is engraved. In addition, a plurality of pin holes 614 for inserting and rotating a pin of a fastening wrench are formed on the outer peripheral surface on the end surface 611 side.
[0017]
Then, by adjusting the screwing length between the cap 610 and the holding tube 400, the pressing force of the presser tube 600 is adjusted, and the contact pressure between the inner packing 410 and the outer peripheral surface of the casing pipe 200 is adjusted. Can do.
[0018]
[Construction method]
After the apparatus of the present invention is installed at the base of the anchor hole 210 to be drilled as described above, a drainage hose is connected to the drainage port 311 and led to a predetermined muddy water treatment place. On the other hand, a plug is screwed into the consolidating material inlet 321 and closed. Then, the casing pipe 200 is inserted from the insertion hole 612 side of the cap 610, and excavation is performed while rotating.
[0019]
At this time, since the drain pipe 300 and the holding pipe 400 are elastically connected via the outer packing 500, it is possible to follow the eccentric oscillation that occurs when the casing pipe 200 is inserted. The same applies when the casing pipe 200 described later is pulled out.
[0020]
Further, the drilling mud tries to spout out of the hole through the gap between the casing pipe 200 and the hole wall, but since the mud is stopped by the inner packing 410 and the outer packing 500, the mud is discharged from the drain port 311 and Water is sent to a predetermined muddy water treatment place through a hose. Therefore, the work environment is not deteriorated. During drilling, the hose may be connected to the binder inlet 321 for drainage.
[0021]
After the drilling is completed, the construction is proceeded in the order of injection of the consolidated material into the anchor hole 210 → insertion of the steel wire → removal of the casing pipe 200 / pressure injection of the consolidated material → tension / fixation. Muddy water generated when the casing pipe 200 is pulled out can also be drained to a predetermined muddy water treatment place through the drain port 311.
[0022]
When the last casing pipe 200 is pulled out, as shown in FIG. 1, when the tip 201 approaches the seat plate 100, the pulling is stopped, and the solid filler inlet 321 is opened. From there, a caking material 700 such as water glass is poured into the hole. Accordingly, since the remaining drilling mud in the hole can be solidified, it is possible to prevent the drilling mud from being ejected immediately after the casing pipe 200 is completely pulled out.
[0023]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained. <I> The drilling mud sprayed out of the hole at the time of drilling or pulling out the casing pipe can be sent to a predetermined treatment place through the drain port of the drain pipe, so that the work environment can be improved. .
[0024]
<B> Immediately before pulling out the last casing pipe, the remaining drilling mud in the hole can be solidified by injecting the caking material into the hole from the inlet provided in the drain pipe. It is possible to prevent the drilling mud from being ejected immediately after all the holes have been pulled out.
[0025]
<C> Since the drain pipe and the holding pipe are elastically connected, it is possible to follow the eccentric oscillation that occurs when the casing pipe is inserted and pulled out. Therefore, the frictional resistance between the outer peripheral surface of the casing pipe and the inner peripheral surface of the holding pipe, which is generated by eccentric oscillation, can be reduced, and the life of the holding pipe and the casing pipe can be extended, which is economical. Further, since the casing pipe can be smoothly inserted and pulled out, the work efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is an overall explanatory view of an embodiment of the present invention. FIG. 2 is an exploded view of an embodiment of the present invention. FIG. 3 is an explanatory view of a drain pipe according to an embodiment of the present invention. Figure

Claims (3)

In an apparatus for preventing drilling of mud drilling holes installed outside the hole at the mouth of the anchor hole and holding the outer peripheral surface of the casing pipe for drilling so as to be able to stop water,
A pipe that is installed at the base of the anchor hole and penetrates the casing pipe, the drain pipe having a drain hole for drilling mud on the peripheral surface;
A pipe that is connected to the drain pipe and penetrates the casing pipe, and a holding pipe that holds the gap between the outer peripheral surface of the pipe body and the outer peripheral surface of the casing pipe in a water-stoppable manner;
While interposing the connecting portion between the drain pipe and the holding tube to stop the connecting portion,
Ri and holding tube and drainage tube Na more outer packing for elastically connecting,
The holding pipe is characterized in that it is connected to the casing pipe so as to be able to swing eccentrically by the elasticity of the outer packing sandwiched between the drain pipe and the drain pipe .
Muddy water ejection prevention device for anchor hole drilling. In the muddy water ejection preventing device during anchor hole excavation according to claim 1,
The peripheral surface of the drainage pipe is provided with an injection port for caking material separately from the drainage port,
Muddy water ejection prevention device for anchor hole drilling. In the muddy water ejection preventing device during anchor hole excavation according to claim 1 or 2,
The outer packing is attached to the outer peripheral surface of the holding tube,
And it is characterized by being sandwiched and attached by a flange projecting in the middle of the outer peripheral surface of the holding pipe and a flange projecting at the end of the drain pipe,
Muddy water ejection prevention device for anchor hole drilling.

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