JPH08338190A - Slime exhausting device in tunnel prelining work method - Google Patents

Abstract

PURPOSE: To exhaust drilling slime effectively by providing multiple exhaust outlets directed from the inner periphery near the end wall of an inner hole to the rear slant direction in the drive cylinder of a swivel connected to a double tube. CONSTITUTION: A slime exhausting device is provided with a double tube P comprising an inner tube at the top end of which a down-the-hole hammer with a drilling bit is provided and which is left on the natural ground after drilling and a reinforcing tube 30 which is smaller in diameter than the drilling bit and left on the natural ground after drilling. Next the inner tube of the double tube P is connected to the drive cylinder 11 of a swivel 10, and the reinforcing tube 30 is connected to the driven cylinder 15 of the swivel 10. Also multiple exhausting outlets 14 directed from the inner periphery near the end wall 12a of the inner hole 12 of the drive cylinder 11 to the rear slant direction are formed, an annular groove 20 interconnected to an exhaust outlet 14 is provided in the driven cylinder 15, and an exhaust cylinder 22 for interconnecting the annular groove 20 to the outside is provided. Thus slime transported through a clearance between the inner tube and reinforcing tube 30 is fed through a clearance between the inner tube and swivel inner hole 12, receives the resistance of the end wall 12a of the inner hole 12, and exhausted from the exhaust cylinder 22 through the exhaust outlet 14 and annular groove 2O.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slime discharging device in a prelining method, which is an auxiliary method for stabilizing the ground in tunnel construction with poor geological conditions.

[0002]

2. Description of the Related Art The pre-lining method is also called a pre-receiving method and is one of the auxiliary methods for stabilizing the ground in large-section tunnel construction under poor geological conditions.

In recent years, there is a tendency for construction work to be carried out in places with poor geological conditions, and various receiving methods have been developed. An outline of the method is shown in FIG. 4 to FIG. The reinforcing pipe P such as the angle θ, for example 120 °
By placing it over the ground and injecting a hardening material C such as cement milk into the gap between the reinforcing pipe P and the ground Y, an umbrella-like reinforcement is made in the ground in front of the face R before the tunnel excavation. This is a method of forming the material arch A. In the figure, H ₁
Is an air supply tube for sending air for discharging the drilled slime S, and H ₂ is an air vent tube.

[0004]

Conventionally, in a device for drilling using a down-the-hole hammer, a slime discharge port is provided at a right angle to an outer cylinder or a swivel. Therefore, the slime is not discharged smoothly, which hinders the drilling ability.

An object of the present invention is to provide a slime discharging device in a tunnel prelining construction method for effectively discharging holed slime.

[0006]

According to the present invention, a reinforcing pipe such as a steel pipe is driven along the outer circumference of a tunnel arch in a tunnel construction where geological conditions are bad, and a gap between the reinforcing pipe and the ground is formed. In addition, in the tunnel pre-lining method that aims to stabilize the ground in front of the face by injecting a hardening material such as cement milk into the inside of the reinforcing pipe, the down-the-hole hammer with the drill bit remaining on the ground after drilling is attached. The inner pipe of the double pipe consisting of an inner pipe with a tip and a reinforcement pipe having a diameter smaller than that of the drill bit and remaining in the ground after drilling is connected to the drive cylinder of the swivel, and the reinforcement pipe is swiveled. A plurality of discharge ports that are connected to the driven cylinder of the drive cylinder and are directed obliquely rearward from the inner circumference of the inner wall of the inner hole of the drive cylinder, and the driven cylinder has an annular groove communicating with the discharge port and the annular groove. Providing a discharge tube that connects the groove to the outside There.

[0007]

In the slime discharge device in the tunnel prelining method constructed as described above, the slime conveyed through the gap between the inner pipe and the reinforcing pipe is sent between the inner pipe and the swivel inner hole, Due to the resistance of the end wall of the inner hole, it is effectively discharged from the discharge tube from the discharge port through the annular groove.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a prelining drilling machine J for carrying out the present invention.
A crawler or wheel type bogie, in the illustrated example, a crawler type bogie 1 is provided with a mast 2 and a boom 4, and a rock drilling machine 7 to which a double pipe, which will be described later in detail, is connected, rotates the pipe. Move in a straight line. The mast 2 is elevated by the hydraulic cylinders 3, 5, and 6 via the boom 4, and as shown in FIG.

In FIG. 2, the rock drill 7 includes a rotating device 8
Further, a drive shaft 7a to which rotation and thrust are applied by the striking device 9 is provided, and a swivel generally designated by 10 is screwed onto the drive shaft 7a, and the swivel 10 is generally designated by P. Heavy pipe is connected.

In FIG. 3, the swivel 10 is provided with a drive cylinder 11 screwed onto the drive shaft 7a and a driven cylinder 15 which is rotatable relative to the drive cylinder 11. An extension rod 31 having one end screwed into the drive cylinder 11 is provided in the inner hole 12 of the drive cylinder 11.
An inner pipe (not shown) is connected to the other end of 1. A radial air passage 13 communicating with the inner hole 32 of the extension rod 31 is formed in the drive cylinder 11.
An air supply socket 23 is provided in the air passage 13.

The driven cylinder 15 is sealed to the drive cylinder 11 by a plurality of Teflon bearings 16, an O-ring 17, and a Teflon rubber damper 18. An inner ring 19 has a Teflon rubber damper 1 at the front of the driven cylinder 15.
The inner ring 19 is tightly fitted with the reinforcing pipes, that is, the outer cylinder 30 via the O-rings 17a, 17a. The outer tube 30 and the inner tube (not shown) form a double tube P.

The inner wall 2 of the drive cylinder 11 has an end wall 12a.
A plurality of (two in the illustrated example) outlets 14 are formed in the rearward oblique direction at an angle α from the vicinity of. The end wall 12a side of the discharge port 14 is formed so as to approach the end wall 12a as much as possible. Further, the angle α is 30 ° to 60
It is adopted in the range of °.

On the other hand, the driven cylinder 15 is formed with an annular groove 20 having a width sufficient to cover the opening of the discharge port 14. The annular groove 20 is provided in the passage 2 concentric with the outlet 14.
1 and a discharge cylinder, that is, a discharge socket 2 protruding from the outside
2 is connected to the outside.

Next, the operation will be described.

At the time of drilling, the swivel machine 7 swivels 20.
The double pipe P is driven through the air supply socket 23, air is sent from the air supply socket 23 through the inner hole 32, and the down-the-hole hammer drives the drilling bit to drill the hole. At this time, the outer tube 30 is
It is just a follow-up rotation.

The drilling slime is sent rearward by air from the drilling bit side and enters the inner hole 12. The slime that has entered the inner hole 12 is successively sent to the side of the end wall 12a,
In response to this resistance, the discharge socket 22 is smoothly discharged to the outside of the swivel 20 through the discharge port 14, the annular groove 20, and the passage 21.

When the angle α is 30 ° or less, the discharge is not smooth because it is close to the conventional right angle, and when the angle α is 60 ° or more, the elliptical cross section of the discharge port 14, the passage 21 and the discharge socket 22 has a large major axis. It is not preferable because of its structure. Therefore, the angle α is preferably in the range of 30 ° to 60 °.

[0019]

Since the present invention is configured as described above, it is possible to effectively discharge the drilling slime and improve the drilling efficiency.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a prelining punching machine for carrying out the present invention.

FIG. 2 is a side view showing a rock drill equipped with a swivel embodying the present invention.

FIG. 3 is a side sectional view showing an embodiment of the present invention.

FIG. 4 is a side sectional view showing an outline of a tunnel prelining method.

5 is a front sectional view of FIG.

FIG. 6 is an enlarged side sectional view of a main part of FIG.

[Explanation of symbols]

 A ... Arch C ... Hardened material J ... Pre-lining punch P ... Double pipe T ... Tunnel Y ... Ground 1 ... Bogie 2 ... Mast 3, 5 , 6 ... Hydraulic cylinder 4 ... Boom 7 ... Rock drilling machine 7a ... Drive shaft 8 ... Rotating device 9 ... Striking device 10 ... Swivel 11 ... Drive cylinder 12. ..Inner hole 12a ... end wall 13 ... air passage 14 ... exhaust port 15 ... driven cylinder 16 ... Teflon bearing 17 ... O ring 18 ... Teflon rubber damper 19 ... -Inner ring 20 ... Annular groove 21 ... Passage 22 ... Exhaust socket 23 ... Air supply socket 30 ... Outer cylinder 31 ... Extension rod 32 ... Inner hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Maeda 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yuji Tsuchihashi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Yasuo Higuchi 1-2-7 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Yasunobu Shiraishi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Action of the inventor No. 3-8 Moto-Akasaka, Minato-ku, Tokyo No. 3-8 Tokyo Branch of Kashima Construction Co., Ltd. (72) Inventor Yoshikazu Yamashita 1-chome, Moto Akasaka, Minato-ku, Tokyo 3-8 Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Akira Higuchi 2-35 Shinozaki-cho, Edogawa-ku, Tokyo Higuchi Engineering Co., Ltd. (72) Inventor Kozo Oishi 3-chome Tamama, Okayama Prefecture 1 No. Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works (72) Inventor Nozomi Nakayama No. 3-1-1 Tam, Okayama Prefecture Mitsui Shipbuilding Co., Ltd. Tamano Works (72) Inventor Katsumi Maeda 5-6-4 Tsukiji, Chuo-ku, Tokyo No. Mitsui Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. In a tunnel construction with bad geological conditions, a reinforcing pipe such as a steel pipe is placed along the outer circumference of the tunnel arch, and cement milk or the like is hardened in the gap between the reinforcing pipe and the ground and inside the reinforcing pipe. In the tunnel prelining method that stabilizes the ground in front of the cutting face by injecting material, the inner pipe and the hole with the down-the-hole hammer equipped with the drill bit left on the ground after drilling The inner pipe of the double pipe, which has a smaller diameter than the bit and is left in the ground after drilling, is connected to the drive cylinder of the swivel, and the reinforcement pipe is connected to the driven cylinder of the swivel, and the drive cylinder A plurality of outlets that are directed obliquely rearward from the inner periphery of the inner wall of the inner hole of the inner hole, and an annular groove communicating with the outlet in the driven cylinder, and an outlet cylinder communicating the annular groove with the outside. Tunnel pre-lay characterized by being provided Slime discharge device in the ninging method.