JPH08199969A - Cutting method by wire saw in tunnel work - Google Patents

Abstract

PURPOSE: To increase the working efficiency and facilitate the construction of the bottom floor. CONSTITUTION: A pair of arms 1a, 1b by which a wire saw 17 is stretched by use of driven pulleies 10, 11, idler pulleies 1-9, 12, 13, 15, 16 and a drive pulley 5, are inserted in a pair of holes B1, B2 to circulate the wire saw 17 at a high speed while actuating an tension thereto. The arms 1a, 1b are transferred to the depth of the holes B1, B2 to form a cut face D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting with a wire saw in tunnel construction.

[0002]

2. Description of the Related Art In conventional tunnel construction, a plurality of blast holes along the outer shape of a tunnel are usually drilled in rock, and the blast holes are blasted to crush the ground and excavate using cracks. Was building a tunnel.

[0003]

Therefore, the construction efficiency is low, and it is troublesome to form the bottom floor portion flat.

An object of the present invention is to provide a method of cutting with a wire saw in tunnel construction, which improves construction efficiency and facilitates construction of a bottom floor.

[0005]

According to the method of the present invention, a pair of arms having a wire saw stretched through a pulley is inserted into a pair of holes drilled in the ground, and a wire saw between the pair of arms is sufficient. It is characterized in that it is circulated at high speed while applying tension, and while the rock between a pair of holes is cut by the wire saw, the arm is moved to the back of the hole and a cutting surface is formed in the ground by the wire saw.

For the wire saw, it is preferable to use a wire rope in which a number of sintered rings containing diamond abrasive grains are mounted.

[0007]

In the present invention, a plurality of cutting surfaces for connecting a plurality of holes are formed, and the ground surfaces and the rock cutting portion are separated by these cutting surfaces. Therefore, the rock mass of the rock drilling part is easy to crush,
Construction efficiency is improved.

In addition, the bottom floor portion is formed at the same time in the cut cross section, which saves labor.

[0009]

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

1 and 2 show an apparatus embodying the present invention. A pair of parallel arms 1a and 1b are provided at a front portion (right side in the drawing) of the base (not shown) so as to be able to move back and forth by means not shown.

A motor base 2 is provided at the rear of the base so as to be able to move forward and backward by means not shown. A hydraulic motor 3 is fixed to the base 2 with its axis oriented in the left-right direction, and a drive pulley 5 is fixed to its output shaft 4.

On the other hand, at the front ends of the arms 1a and 1b, driven pulleys 10 and 11 and idler pulleys 9 and 1 are provided, respectively.
2 and are provided. Further, a plurality of idler pulleys 6 to 8 and 13 to 16 are three-dimensionally provided on the base.

A wire saw 17 is wound around these pulleys 5 to 16 in the order of the pulley signs, and the tension can be adjusted by changing the positions of the pulleys 5 and 16, for example. As the wire saw 17, a so-called diamond wire saw is preferably used, in which countless sintered body rings containing diamond abrasive grains are attached to cut reinforced concrete or stone material.

At the time of construction, a pair of holes B1 and B2 in the illustrated example are bored in the ground A to be excavated by a boring machine (not shown) used for forming a blast hole and a rock bolt hole.

Next, the front ends of the arms 1a and 1b are attached to the holes B.
1, wire saw 1 between arms 1a and 1b
A tension is applied to 7a to operate the hydraulic motor 3 to circulate the wire saw 17 at high speed. Then, the ground A between the arms 1a and 1b is linearly cut by the wire saw 17a.

Therefore, while moving the motor base 2 in the direction of the arrow, the arms 1a and 1b are moved forward to move the arm 1
As shown in FIG. 3, a cutting surface D is formed on the natural ground A by the wire saw 17a between a and 1b.

By the same procedure, the cut surfaces D1 to D9 are formed along the outer shape of the tunnel.

In this way, if the rock mass A and the rock drilling portion E are divided by the cutting surfaces D and D1 to D9 and then the rock drilling portion E is crushed by a rock drilling machine such as a breaker (not shown), the rock drilling portion E is easily formed. And a tunnel is formed, and at the same time, a flat bottom floor is formed by the cutting surface D.

FIG. 4 shows an embodiment of tunnel construction,
This is an example in which excavation of the rock drilling portion E1 is facilitated by the three cutting surfaces D, D1, and D2.

FIG. 5 also shows another embodiment of tunnel construction, which is an example in which excavation of rock drilling portions E1 and E2 is facilitated by six cutting surfaces D and D1 to D5.

FIGS. 6 to 8 show another embodiment of tunnel construction. In FIGS. 6 and 7, after the cutting surfaces D and D1 to D4 are formed using the holes B1 to B7, the arm 1 is formed.
Insert a and 1b into the holes B5 and B7 and insert the wire saw 17 into the deepest part of the cutting surfaces D2 and D3. Then, when the wire saw 17 is circulated at a high speed while applying tension to the wire saw 17, the wire saw 17 moves to the positions 17A and 17B to form a vertical cutting surface d1 in the depth of the rock drilling portion.

Next, as shown in FIGS. 8 and 9, the wire saw 17 is similarly moved from the position 17B to the position 17D to form a vertical cutting surface d2 continuous with the vertical cutting surface d1. In this embodiment, the cut surfaces D, D1 to D4 and the vertical cut surfaces d1 and d2 allow the rock drilling portion to be completely separated from the natural ground, thereby facilitating tunnel construction.

[0023]

As described above, according to the present invention, it is possible to improve the tunnel construction efficiency, facilitate the construction of the bottom floor portion, and save labor.

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of a natural ground showing an example of an apparatus for carrying out the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a perspective view illustrating an aspect of forming a bottom floor with a cutting surface.

FIG. 4 is a perspective view illustrating an embodiment of tunnel construction.

FIG. 5 is a perspective view illustrating another embodiment of tunnel construction.

FIG. 6 is a front view illustrating a mode in which a vertical cutting surface is formed at the innermost portion of the tunnel.

FIG. 7 is a perspective view of FIG.

FIG. 8 is a front view illustrating the next stage of FIG.

9 is a perspective view of FIG.

[Explanation of symbols]

 A ... Ground B ... Hole D ... Cutting surface E ... Rock drilling part 1a, 1b ... Arm 2 ... Motor base 3 ... Hydraulic motor 4 ... Output shaft 5 ... ..Drive pulleys 10, 11 ... Driven pulleys 6-9, 12-16 ... Idler pulleys 17 ... Wire saws

Claims (1)

[Claims] 1. A pair of arms having a wire saw stretched through a pulley is inserted into a pair of holes drilled in the ground, and the wiresaw between the pair of arms is circulated at high speed while sufficient tension is applied to the wiresaw. A method for cutting with a wire saw in tunnel construction, characterized in that the arm is moved to the back of the hole and a cutting surface is formed in the natural ground by the wire saw while cutting the rock mass between the pair of holes by.