JP2012211477A - Drilling device for correction of direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling device for correction of direction capable of easily correcting a hole bending occurring in a hole drilled in a concrete structure or the like by a drilling machine.SOLUTION: A drilling device for correction of direction comprises: a propulsion guide pipe 13 which can be inserted into a drilled hole 12; a drilling bit 14 rotatably mounted at the tip of the propulsion guide pipe 13; and a flexible shaft with a tip connected to the drilling bit 14 and transferring a torque to the drilling bit 14, and a plurality of slits 16 extending in a circumferential direction are formed on the peripheral surface of a tip part of the propulsion guide pipe 13 at intervals in the axial direction. A hole bending is corrected by inserting the propulsion guide pipe 13 into the drilled pipe 12, while arranging a region on which the slits 16 are formed on a side opposite to the bending direction of the occurred hole bending 12a, and drilling while directing the drilling bit 14 toward the side opposite to the bending direction of the hole bending 12a.

Description

  The present invention relates to a direction correcting drilling device, and in particular, a direction used to correct a generated hole bend when a hole is formed in a hole drilled in a concrete structure or rock using a drilling machine. The present invention relates to a correction drilling device.

  For example, a small diameter hole of, for example, several tens of mm to one hundred and several tens of mm is drilled in a concrete structure or bedrock having a considerable thickness of several m to several tens of m, and a circular pipe for piping, for example, is inserted. When performing the construction, if the hole to be drilled is bent and its straightness is impaired, it becomes difficult to insert a circular pipe for piping.

  On the other hand, the work of drilling small-diameter holes in concrete structures and rocks is performed using various known drilling machines such as boring drills and drilling machines equipped with hammers. When drilling small-diameter holes using this drilling machine, for example, there is a difference in strength in the concrete or rock mass around the drilled area, there is a harder material such as a reinforcing bar, etc. If the soft layer part coexists or cracks occur, the excavation bit attached to the tip of the drilling machine will excavate in the direction of less hardness or strength, and the hole Bending may occur.

  For this reason, various techniques have been developed that enable correction of a bent hole in a hole drilled in a concrete structure or rock using a drilling machine (for example, patent documents). 1).

Japanese Patent Laid-Open No. 2004-9703

  In the drilling method of Patent Literature 1, when a hole is drilled in a hole drilled using a boring drilling machine, the rod of the boring drilling machine is once pulled out from the drilled hole, and a diameter expanding bit is provided at the tip. Insert another rod to expand and drill the hole bent part to form an expanded perforated part, fill the hardened material such as mortar with the expanded expanded perforated part and harden it, and then perform normal cutting again The bending of the hole is corrected by inserting a rod provided with a bit and re-drilling in a straight line by a boring hole drilling machine.

  According to the drilling method of Patent Document 1, it is possible to drill a small-diameter hole with a desired length in a straight line with a desired length using a drilling machine. Because it requires a process of filling and curing a hardened material such as mortar in the enlarged diameter perforated part formed in the bent part, these processes require a lot of time and labor, and the construction cost also increases. The development of a technology that can easily correct the hole bending is desired.

  In the present invention, when a hole is bent in a hole drilled in a concrete structure or rock using a drilling machine, the hole generated is not required to be filled with a hardening material in the hole bent portion and cured. An object of the present invention is to provide a direction correcting drilling device capable of correcting the bending more easily.

  The present invention relates to a direction correcting drilling device used for correcting a generated hole bend when a hole bend is generated in a hole drilled in a concrete structure or rock using a hole drilling machine. A propulsion guide pipe that can be inserted into the formed hole, a drilling bit that is rotatably attached to the tip of the propulsion guide pipe, and a tip portion disposed in the hollow interior of the propulsion guide pipe. And a flexible shaft that transmits a rotational force to the excavation bit from the hole opening side, and in a substantially semicircular region on one side of a circular peripheral surface at a tip portion of the propulsion guide pipe. A plurality of slits extending in the circumferential direction are formed at intervals in the axial direction of the propulsion guide pipe, and the slit is formed on the side opposite to the bending direction of the generated hole bending. With the semi-circular region on one side arranged, the propulsion guide pipe is inserted into a hole that is perforated, and a propulsive force is applied to the propulsion guide pipe from the hole opening side, and the flexible shaft is inserted through the flexible shaft. By applying a rotational force to the excavation bit, the propulsion guide pipe is propelled while excavating a concrete structure or rock with the excavation bit, and the width of the slit is narrowed so that the excavation bit is bent in the bending direction of the hole. The object is achieved by providing a direction correcting drilling device that is capable of excavating toward the opposite side to correct the hole bending.

  Further, in the direction correcting hole drilling device of the present invention, a water passage hole is formed through the excavation bit, and water pumped through the hollow interior of the propulsion guide pipe is passed through the water passage hole. By supplying the drilling bit in front of the drilling bit, the drilling waste together with the supplied water is removed to the hole opening side through a gap between the inner wall surface of the drilled hole and the outer peripheral surface of the propulsion guide pipe. It is preferable to do so.

  Further, in the direction correcting hole drilling device of the present invention, it is preferable that the slit is in a state of being stopped by embedding an elastic member.

  According to the direction correcting drilling device of the present invention, when a hole is bent in a hole drilled in a concrete structure or rock using a drilling machine, the hole bending portion is filled with a hardening material and cured. It is possible to more easily correct the generated hole bending without requiring a process.

It is a schematic sectional drawing explaining the principal part of the direction correction drilling apparatus which concerns on preferable one Embodiment of this invention. It is a schematic side view explaining the slit formed in the surrounding surface of a propulsion guide pipe. (A), (b) is a schematic side view explaining the situation where hole bending is corrected by a direction correcting drilling device according to a preferred embodiment of the present invention.

  A direction correcting drilling device 10 according to a preferred embodiment of the present invention shown in FIG. 1 has, for example, a concrete structure 11 as an object to be drilled, for example, a diameter of about 100 mm for arranging a circular pipe for piping. In the construction of drilling the small-diameter hole 12 in a straight line using a boring drill (not shown), there is a difference in strength between the drilled hole 12 and, for example, the concrete in the drilled part, When a hole bending 12a (see FIG. 3) occurs due to the presence of a harder material such as a reinforcing bar, the direction correction is performed to efficiently correct the generated hole bending 12a by a simpler construction method. It was adopted as a drilling device for use.

  Here, various well-known boring drilling machines can be used as the boring drilling machine that drills and forms small-diameter holes in the concrete structure 11 linearly. Specifically, for example, as disclosed in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2004-9703), a cutting bit is detachably attached to the tip portion, and is formed into a long shape by sequentially connecting them. A boring drilling machine equipped with a rod, a swivel joint that grips the proximal end of the rod, a hydraulic motor that rotationally drives the rod via the swivel joint, a propulsion mechanism that propels the rod, a rod guide, a rod clamp, etc. be able to.

  In addition, the work of forming a small-diameter hole in a straight line by such a boring hole drilling machine is performed, for example, in a drilling state such as a rotational torque or thrust of a rod so as to ensure straightness of the hole to be drilled. Is detected by a detecting means such as a load cell, or by measuring the center position of the target attached to the tip of the rod through the hollow interior of the rod, etc. Yes. When hole bending is detected by checking these finished shapes, it is difficult to correct the hole bending even if drilling with a boring hole drilling machine is continued. After correcting the hole bend 12a (see FIG. 3) at the tip of the drilled hole 12 using the direction correcting drilling device 10 of the present embodiment, the rod of the boring drilling machine is inserted again, The drilling work will continue to be performed by a boring drilling machine.

  In the present embodiment, it is described that the bending of a small-diameter hole drilled using a boring drilling machine is corrected. However, the direction correcting drilling apparatus 10 of the present embodiment uses a hitting hammer. It can also be used to correct the bending of a small-diameter hole drilled using various other known drilling machines such as a drilling machine provided.

  The direction correcting hole drilling device 10 of the present embodiment corrects the generated hole bend 12a when the hole bend 12a is generated in the hole 12 drilled in the concrete structure 11 using, for example, a boring hole drill. As shown in FIG. 1 and FIG. 2, a drilling device for correcting the direction used to perform the propulsion guide pipe 13 that can be inserted into the drilled hole 12 and rotatable at the tip of the propulsion guide pipe 13. The excavation bit 14 attached to the propeller and the propulsion guide pipe 13 are disposed inside the hollow, and the distal end portion is connected to the excavation bit 14 so that a rotational force is applied to the excavation bit 14 from the hole (not shown) side. And a slit 16 extending in the circumferential direction in a semicircular region on one side of the circular circumferential surface at the tip portion of the propulsion guide pipe 13. At intervals in the axial direction of the propulsion guide pipe 13 formed with a plurality (see Fig. 2).

  Further, as shown in FIGS. 3 (a) and 3 (b), the propulsion guide is arranged in a state where a semi-circular region on one side where the slits 16 are formed is arranged on the side opposite to the bending direction of the generated hole bending 12a. By inserting the pipe 13 into the drilled hole 12, applying a propulsive force to the propulsion guide pipe 13 from the hole opening side, and applying a rotational force to the excavation bit 14 via the flexible shaft 15, the concrete structure 11 The bend is corrected by propelling the propulsion guide pipe 13 while excavating the excavation bit 14 and by narrowing the width of the slit 16 and excavating the excavation bit 14 in the direction opposite to the bending direction of the hole bending 12a. It can be done.

  In the present embodiment, the propulsion guide pipe 13 is a circular steel pipe pipe having an outer diameter that can be inserted into the drilled hole 12, and can be the same as a rod of a boring drill. The propulsion guide pipe 13 can be formed in a long shape by sequentially connecting unit pipes having a predetermined length to the rear. Further, the propulsion guide pipe 13 is inserted into the drilled hole 12 without rotating in the work yard on the hole opening side, and connected to the propulsion mechanism of the boring drilling machine, and propulsion is performed. The propulsion force from the mechanism allows propulsion while excavating the concrete at the tip cutting surface of the hole 12 by the excavation bit 14 at the tip that is rotatably attached.

  As the excavation bit 14 attached to the tip of the propulsion guide pipe 13, a well-known one suitable for direction correction such as a reaming bit can be used. As the excavation bit 14, a well-known one suitable for cutting a concrete structure or a reinforced concrete structure in which a cemented carbide chip, a diamond chip, or the like is preferably embedded can be used. As shown in FIG. 1, the excavation bit 14 is preferably composed of a rod-shaped bearing portion 17a made up of a large number of rod-shaped bearings arranged continuously in the circumferential direction, and a spherical bearing portion made up of a large number of spherical bearings arranged continuously in the circumferential direction. The thrust guide pipe 13 is rotatably attached to the tip of the propulsion guide pipe 13 using a known needle bearing with a thrust bearing (manufactured by Nippon Thomson Co., Ltd.) 17. The excavation bit 14 is connected to the flexible shaft 15 inside the propulsion guide pipe 13, and can be rotated by the rotational driving force from the flexible shaft 15 to excavate the concrete at the tip cutting surface of the hole 12. Yes.

  Further, in the present embodiment, the drilling bit 14 has a water passage hole 18 formed therethrough, and the water pumped through the hollow interior of the propulsion guide pipe 13 passes through the water drilling hole 18. By supplying forward, excavation waste together with the supplied water can be removed to the hole opening side via a gap 19 between the inner wall surface of the drilled hole 12 and the outer peripheral surface of the propulsion guide pipe 13. It has become.

  As the flexible shaft 15 for transmitting the rotational force to the excavation bit 14, various known shafts having a function of transmitting the rotational driving force from the rotary motor to the rotated body even when the central axis is curved or bent are used. can do. Preferably, a standard flexible shaft manufactured by Chuo Flexi Co., Ltd. can be used. The flexible shaft 15 has a front end connected to the excavation bit 14 from the rear, and the hollow interior of the propulsion guide pipe 13 is extended, and the rear end of the flexible shaft 15 is a hydraulic pressure of a boring drilling machine in the work yard on the hole opening side. By connecting to the motor, the excavation bit 14 can be rotationally driven by an operation from the work yard.

  In the present embodiment, as shown in FIG. 2, a slit 16 is formed on the peripheral surface of the tip portion of the propulsion guide pipe 13. In the present embodiment, the slit 16 extends in the circumferential direction with a slit width of, for example, about 5 mm within the semicircular region on one side of the circular circumferential surface of the propulsion guide pipe 13 and the axial direction of the propulsion guide pipe 13. Are formed in parallel with a pitch of about 20 mm passing through the front and back of the peripheral surface of the propulsion guide pipe 13.

  Further, in the present embodiment, the slit 16 is in a state where the slit 16 is stopped by embedding rubber 20 as an elastic member, for example.

  And according to the direction correction drilling apparatus 10 of this embodiment provided with the above-mentioned structure, when the hole bending 12a generate | occur | produces in the hole 12 drilled in the concrete structure 11 using a drilling machine, a hole bending is produced | generated. The generated hole bend 12a can be more easily corrected without requiring a step of filling the portion with a curing material and curing.

  That is, the direction correcting hole drilling device 10 of the present embodiment is rotatably attached to the propulsion guide pipe 13 that is inserted and propelled without rotating into the drilled hole 12 and the tip of the propulsion guide pipe 13. The excavation bit 14 and a flexible shaft 15 whose tip is connected to the excavation bit 14 are configured, and a plurality of slits 16 are formed in a substantially semicircular region on one side of the peripheral surface of the propulsion guide pipe 13. Since it is formed, propulsive force is applied to the propulsion guide pipe 13 from the hole opening side in a state where the slit 16 is disposed on the opposite side to the bending direction of the hole bend 12a, and to the excavation bit 14 via the flexible shaft 15. By applying a rotational force, the slit 16 is narrowed and the excavation bit 14 is excavated in the direction opposite to the bending direction of the hole bending 12a. Ri, so that it is possible to easily modify the hole bending 12a. This makes it possible to easily and efficiently correct the hole bend 12a generated in the drilled hole 12, without requiring a step of filling the hole bent portion with a curing material and hardening it.

  When the hole bending 12a is corrected by the direction correcting drilling device 10 of the present embodiment, the propulsion guide pipe 13 is pulled out from the drilled hole 12 together with the excavating bit 14 and the flexible shaft 15, and then the rod of the boring drilling machine again. Then, an operation for continuously drilling a small-diameter hole by a boring hole drilling machine is performed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the small-diameter hole whose hole bending is corrected by the direction correcting drilling device of the present invention may be a hole drilled in a rock mass in addition to a hole drilled in a concrete structure. Further, the slit formed in the substantially semicircular region on one side of the peripheral surface of the tip portion of the propulsion guide pipe need not necessarily extend in a substantially semicircular shape over the entire semicircular region on the one side. It can be formed by adjusting the length in the circumferential direction as long as it does not exceed the region of the substantially semicircle on one side.

DESCRIPTION OF SYMBOLS 10 Direction correction drilling device 11 Concrete structure 12 Drilled hole 12a Hole bending 13 Propulsion guide pipe 14 Drilling bit 15 Flexible shaft 16 Slit 17 Needle bearing 18 with thrust bearing Water flow hole 19 The inner wall surface of the drilled hole Gap 20 between the outer peripheral surface of the propulsion guide pipe Rubber (elastic member)

Claims (3)

A direction correcting hole drilling device used to correct a generated hole bend when a hole bend is generated in a hole drilled in a concrete structure or rock using a hole drilling machine,
A propulsion guide pipe that can be inserted into the drilled hole, a drilling bit that is rotatably attached to a tip of the propulsion guide pipe, and a tip portion disposed in the hollow interior of the propulsion guide pipe And a flexible shaft that transmits a rotational force to the excavation bit from the hole opening side.
In addition, a plurality of slits extending in the circumferential direction are formed at intervals in the axial direction of the propulsion guide pipe in a region of a substantially semicircle on one side of the circular circumferential surface at the tip portion of the propulsion guide pipe,
Inserting the propulsion guide pipe into the perforated hole in a state where the one-side substantially semicircular region in which the slit is formed is arranged on the opposite side to the bending direction of the generated hole bending, the hole opening portion A propulsive force is applied to the propulsion guide pipe from the side, and a rotational force is applied to the excavation bit via the flexible shaft, thereby propelling the propulsion guide pipe while excavating a concrete structure or rock mass with the excavation bit. In addition, a direction correcting drilling device in which the width of the slit is narrowed and the excavation bit is excavated in a direction opposite to the bending direction of the hole bending to correct the hole bending.   The drilling bit has a water passage hole formed therein, and is supplied by supplying water pumped through the hollow interior of the propulsion guide pipe to the front of the drilling bit through the water passage hole. 2. The direction correcting drilling device according to claim 1, wherein excavation waste together with water is removed to the hole opening side through a gap between an inner wall surface of the drilled hole and an outer peripheral surface of the propulsion guide pipe.   The direction correcting hole drilling device according to claim 2, wherein the slit is in a state of being stopped by embedding an elastic member.

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