JP2599757Y2 - Pipe holder for drilling equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe holder for a drilling machine used for tunnel construction and the like.

[0002]

2. Description of the Related Art A method of inserting a pipe into a hole drilled with a lock bit and injecting a chemical solution for strengthening the ground through the pipe has been adopted for tunnel construction and the like, and as a device used for carrying out this method, An apparatus has been developed which uses a scalable lock bit to bury a pipe at the same time as drilling. FIG. 6 shows a drilling device of this type, in which a pilot bit 54 is expanded and contracted at a tip end of a drilling rod 53 connected to a shank rod 51 attached to a drifter (rock drill) 50 by a coupling sleeve 52. A possible enlarged bit 55 is mounted, and a pipe 56 whose inner diameter is larger than the outer diameter of the pilot bit 54 and smaller than the enlarged diameter of the enlarged bit 55 is fitted on the outside of the drill rod 53. The pipe 56 is supported by a pipe holder 60 provided between the drifter and the pipe. The pipe holder 60 is provided with the coupling sleeve 5.
2 has a hollow portion 57 containing a connecting portion, and a pipe fitting portion is provided at a distal end portion. During drilling, a thrust is transmitted from the drifter 50 to the pipe through the pipe holder.

[0003] When the above drilling device is used, a pilot hole drilled by a pilot bit 54 is expanded by a diameter expanding bit 55, and a pipe 56 is inserted into the hole. When the drilling is completed, the diameter of the expanding bit 55 is reduced, and the pilot bit and the expanding bit are
Through the inside of the. As a result, the pipe remains in the drilled hole.

[0004]

The above-mentioned conventional pipe holder has a complicated shape as shown in FIG. 6, and is constituted by combining a plurality of parts. It was difficult. Further, since only the thrust of the drifter is transmitted to the pipe, it becomes difficult to insert the pipe in a relatively hard stratum. Further, when the coupling sleeve 52 is loosened or detached, the pipe holder must be once disassembled and tightened, so that there is a problem that workability is poor.

[0005]

In order to solve the above problems, the present invention employs the following configuration. That is,
The pipe holder according to the present invention is a pipe holder that is externally fitted to a drill rod on which a lock bit is mounted, and that supports a pipe inserted and embedded in the hole as the drill advances as the drill bit advances. A cylindrical body having an inner diameter larger than the outer diameter of the drilled rod, an outer peripheral portion of which is provided with a hole for discharging flour in and out, and a distal end portion provided with a small-diameter portion in which the pipe is fitted externally. A smaller diameter portion than the outer diameter of the coupling rod, which is formed at the base of the small diameter portion with a stepped portion at which the end of the pipe abuts, and the outer diameter of the coupling sleeve which joins the drilling rods. It has a larger core hole than the coupling sleeve rear surface there between the coupling sleeve and the holder body
And a holder cap that comes into contact with the holder cap.

[0006]

[Function] A pipe externally fitted to a drill rod is fitted into a small diameter portion of a holder body, and a holder cap is positioned between a coupling sleeve and a holder body to perform drilling. Is transmitted to the pipe via the coupling sleeve and the pipe holder, so that the pipe can be easily buried even in a relatively hard stratum. The powder that flows backward through the pipe into the drill hole is discharged from the hole for discharging the powder provided on the outer periphery of the holder body, so that the powder does not clog the pipe, and a good drill hole is formed. It can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment shown in the drawings will be described below. FIG. 1 shows an example of the present invention. The pipe holder 1 includes a holder body 2 and a holder cap 3. The holder body 2 is, as shown in FIGS.
A small-diameter cylinder 6 is attached to one end of one cylinder
And a flange 7 is integrally formed at an intermediate portion of the small-diameter cylindrical body 6, and the flange 7 is brazed in a state where the flange 7 is in contact with the end surface of the other cylindrical body 5. You. The portion protruding from the front part of the cylindrical body 5 is a small-diameter part 2a, and the root part of the small-diameter part 2a is
Are formed. Openings 9 and 9 are opened near the end of the cylindrical body 5 so that gas can escape during brazing. Further, a pair of long holes 10 for discharging powdered dust are provided on the outer peripheral portion of the intermediate portion of the cylindrical body 5 at positions diametrically opposite to each other with their front and rear positions shifted from each other.

The cap 3 is, as shown in FIGS.
A ring-shaped member having an inward flange 12 formed at one end thereof. The center of the inward flange 12 is larger than the outer diameter of the drilling rod 53 and larger than the outer diameter of the coupling sleeve 52. A small opening 13 is provided.
The inside diameter of the body 14 is substantially equal to the outside diameter of the holder body 2. Although the holder main body 2 is fitted inside the cap 3 in the illustrated example, any method of coupling the holder main body 2 and the cap 3 may be used. Alternatively, the cap 3 may be formed integrally with the holder body.

As shown in FIG. 1, the pipe holder 1 has a front end of a coupling sleeve 52 for connecting a shank rod 51 and a drill rod 53 by fitting a cap 3 to a rear end of the holder body 2. , And the pipe 56 is fitted to the small diameter portion 2a. When drilling is performed in this state, the striking force and the thrust of the drifter 50 are transmitted through the coupling sleeve 52, the cap 3, and the stepped portion 2b of the holder body 2 to the pipe 56.
The pipe is easily inserted. The powdered powder that has entered between the pipe and the drilling rod in the drilling hole flows back to the pipe holder side, and is discharged to the outside from the elongated hole 10 for discharging the powdered dust provided on the outer peripheral portion of the pipe holder.

[0010]

As is clear from the above description, the pipe holder according to the present invention is structurally simple and easy to manufacture. In the borehole, not only the thrust of the rock drill but also the impact force is transmitted, so that the pipe can be easily buried. In addition, since the coupling sleeve is located outside the pipe holder, it is easy to treat when the coupling sleeve is loosened or detached. Furthermore, the powder that has entered the pipe into the drilling hole flows backward through the pipe and is discharged to the outside through the powder discharge hole of the pipe holder. Drilling can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a use state of a pipe holder.

FIG. 2 is an external view of a holder main body.

FIG. 3 is a sectional view of a holder main body.

FIG. 4 is a front view of the cap.

FIG. 5 is a longitudinal sectional view of a cap.

FIG. 6 is a cross-sectional view illustrating a use state of a conventional pipe holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe holder 2 Holder main body 2a Small diameter part 2b Step part 3 Cap 52 Coupling sleeve 53 Drilling rod

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryuji Tsuruta 26-5 Ikeda-Nishimachi, Neyagawa-shi, Osaka Toho Kinzoku Co., Ltd. Neyagawa Plant (56) References JP-A-53-34601 (JP, A) 42-3923 (JP, B1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A pipe holder for externally fitting a drill bit on which a lock bit is mounted, for supporting a pipe inserted and embedded in the hole as the drill advances as the drill bit progresses. It is made of a cylindrical body larger than the outer diameter of the drilling rod, and its outer peripheral part is provided with a hole for discharging powder dust that flows in and out, and a small-diameter part at which the pipe is fitted externally is provided at the tip end. At the base of the portion, a holder body having a step where the end of the pipe abuts is formed, and the outer diameter of the coupling sleeve that joins the drilling rods is smaller than the outer diameter of the drilling rod. It has a core hole, there between the coupling sleeve and the holder body
A pipe holder for a drilling device , comprising a holder cap with which the coupling sleeve abuts on a rear surface .