JPS6363720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rock drill for drilling continuous slit-shaped holes.

[Conventional technology]

Conventionally, "core blasting" has been the common blasting method used in tunnel excavation. In this method, the charge is concentrated in the center of the cross-sectional profile of the tunnel, and the rock in the center is first ejected forward to create a free surface, and then one of the many blast holes arranged almost concentrically. , the ignition and crushing are performed outwardly from the inner group to the outer group one after another with a time difference of several lim seconds.

Also, in complete contrast to this construction method, as shown in Figure 5,
Slit-shaped holes 2 are intermittently drilled along the cross-sectional profile of the tunnel, and the slit-shaped holes 2 are used as free surfaces to ignite and fracture one after another inward from the blast holes 3 on the outer circumference to the blast holes 4 on the center side. Construction methods can be considered.

Since this method uses the tensile fracture of rocks, it has many advantages, such as requiring less explosives than the core blasting method, making less noise, and providing a better finished surface.

As one of the continuous hole drilling machines for drilling slit-shaped holes in the above-mentioned construction method, the Soviet Union Patent No.
628304, the first and second rods have a leading bit attached to their front end.
The rods are arranged in parallel at intervals in the lateral direction perpendicular to the excavation direction, and the rock drill body connected to the rear end of each rod is offset in the excavation direction so as not to overlap laterally. However, a first trailing bit is attached to the rear of the leading bit in the first rod, and a second trailing bit is attached to the rear of the leading bit in the second rod behind the first trailing bit. Continuous hole drilling machines are known.

[Problem to be solved by the invention]

In the case of the conventional continuous hole rock drilling machine, there are two rods, a first rod and a second rod, and the first trailing bit attached to the first rod is connected to the second rod.
Since it is offset more forward than the second trailing bit attached to the rod, of the two trailing bits,
Even if the first trailing bit starts cutting the rock, the second trailing bit does not start cutting, so when the first trailing bit starts cutting after cutting by each leading bit, Eccentric cutting resistance acts on the rock drill, which tends to cause deviations in the digging direction.

Also, when cutting with all the bits,
The second trailing bit is arranged so as to overlap a part of the hole cut and formed by the first trailing bit, and cutting is performed.In other words, a free surface is formed in a part of the periphery of the second trailing bit during cutting. Therefore, cutting resistance acts on the second trailing bit in the direction of moving it toward the free surface side, and therefore, even when cutting is performed using all the bits, deviations in the digging direction are likely to occur.

[Purpose and structure of the invention]

The object of the present invention is to provide a continuous hole rock drilling machine that can advantageously solve the above-mentioned problems, in which a plurality of rods each having a bit attached to the front end are spaced apart in the lateral direction perpendicular to the excavation direction. The large-diameter parts of the rock drill main bodies connected to the rear ends of adjacent rods are offset in the excavation direction so that they do not overlap laterally, and the front end of each rod is In a continuous hole rock drilling machine whose portion is inserted through a hole in a spacing member, a rod 12A with a leading bit 14A attached to the front end and a trailing bit 14B at the front end are used.
The rods 12B to which the trailing bits 14B are attached are arranged alternately and parallel to each other in the lateral direction perpendicular to the excavation direction, and the rods 12B to which the trailing bits 14B are attached are located at both ends in the lateral direction. Bit 1
4B is the first invention of a continuous hole rock drill which is placed at the same distance rearward from the leading bit 14A, in which a plurality of rods with bits attached to the front end are spaced apart in the lateral direction perpendicular to the excavation direction. The large-diameter parts of the rock drill main bodies connected to the rear ends of adjacent rods are offset in the excavation direction so that they do not overlap laterally, and the front end of each rod is In a continuous hole rock drilling machine whose portion is inserted through a hole in a spacing member, a leading bit 14 is installed at the front end.
Intermediate rods 12D with trailing bits 14B attached to their front ends are arranged in parallel on both sides of the center rod 12C in the lateral direction, and each intermediate rod 12D
An end rod 12 with a trailing bit 14C attached to the front end on the side opposite to the central rod 12C in
E are arranged in parallel, each trailing bit 14B is spaced the same distance back from the leading bit 14A, and each trailing bit 14C is spaced apart from the trailing bit 14A.
The second invention is a continuous hole rock drill located at a position spaced back from 4B by the same distance.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 3 show an embodiment of the first invention, in which two rods 12A are provided with a leading bit 14A attached to their front ends, and a trailing bit 14 is attached to their front ends.
The rods 12A and 12B are arranged so as to be parallel to each other at equal intervals in a horizontal direction perpendicular to the excavation direction, and the following rods 12B are arranged parallel to each other at equal intervals. The rod 12B to which the rod 14B is attached is arranged so as to be located at both ends in the lateral direction, and each leading bit 14A is arranged on a straight line perpendicular to the longitudinal direction of the rod. They are arranged on a straight line perpendicular to the longitudinal direction of the rod at positions separated rearward by the same distance.

The distal end portion of each rod 12A, 12B is inserted into the through hole of the spacing member 15, and each rod 12A,
12B, a flange 13 is fixed at the rear of the spacing member 15, and a spacing member pressing spring 16 is fitted between the flange 13 and the spacing member 15, and the spring 16 maintains the spacing. A holding member 15 is crimped to the rear part of the trailing bit 14B.

The rear end of the rod 12A is the rock drill main body 11A.
At the same time, the rear end of the rod 12B is connected to the rock drill main body 11B, and the large diameter portion of the one rock drill main body 11A is connected to the large diameter portion of the other rock drill main body 11B. Further, each rock drill main body 11A, 11B is fixed to a common support frame 21, which supports the guide shell frame 20.
It is supported so as to be slidable in the front and rear directions.

Excavation drive device 24 consisting of a motor with a speed reducer
is fixed to the guide shell frame 20, one end portion of a feed screw rod 25 extending in the front-rear direction is connected to the output shaft of the drive device 24, and the shaft portion of the other end of the feed screw rod 25 is fixed to the guide shell frame 20.
A female screw member 28 supported by a bearing provided in the support frame 21 and further fixed to the support frame 21 is screwed into the feed screw rod 25, and the drive device 24 is operated in forward or reverse rotation to rotate the feed screw rod 25 in the normal direction. When rotated or reversed, the support frame 21 supporting the rock drill body is moved forward or backward.

A rod support 29 at the front end of the support frame 21 is provided with a semicircular groove into which each rod is inserted, and one end of the rod holding member 26 is pivoted at one end of the rod support 29 by a pivot 30 extending in the front-rear direction. The rod holding member 26 is provided with a semicircular groove into which each rod is fitted, and the fixing bolt 31 inserted through the other end of the rod holding member 26 is screwed into the rod supporting portion 29, and each rod is inserted into a circular hole formed by the semicircular groove of the rod support part 29 and the semicircular groove of the rod holding member 26, and each rod 12A, 12B is held at a constant interval by the rod support part 29 and the rod holding member 26. has been done.

Tapered fitting joints 27A and 27B are provided at the intermediate portions of the rods 12A and 12B, and the leading bit 14A is removably attached to the front end of the rod 12A by tapered fitting, and the trailing bit 14B is attached to the front end of the rod 12B. It is detachably attached to the front end by tapered fitting, and when a long hole is bored, the front rods in the rods 12A and 12B are replaced with longer rods.

The leading bit 14A and the trailing bit 14B are arranged so that a portion of the bit diametrically overlaps when viewed from the front and rear directions.

FIG. 4 shows an embodiment of the second invention, in which a central rod 12C has a leading bit 14A attached to its front end, and a middle rod 12C has trailing bits 14B attached to its front end on both sides in the lateral direction perpendicular to the excavation direction. The rods 12D are arranged in parallel, and each intermediate rod 12D
An end rod 12 with a trailing bit 14C attached to the front end on the side opposite to the central rod 12C in
E are arranged in parallel, each trailing bit 14B is spaced the same distance back from the leading bit 14A, and each trailing bit 14C is spaced apart from the trailing bit 14A.
It is located at the same distance rearward from 4B. Also each rod 12C, 12D, 12E
are arranged at regular intervals on the same plane, and the bits 14C, 14D, and 14E are arranged in a V-shaped line on the same plane, but the other configurations are the same as in the first embodiment of the invention.

When implementing the first invention, one rod 12A to which the leading bit 14A is attached and the trailing bit 14B
A continuous hole rock drilling machine may be constructed using the two rods 12B with the attached rods 12B.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Rock cutting is performed by the preceding bit 14A,
Next, the trailing bits 14B on both sides of the leading bit 14A start rock cutting at the same time, so the period from when the leading bit 14A starts cutting until when the trailing bits 14B on both sides start cutting,
Eccentric cutting resistance does not act on the rock drill, so it is possible to prevent deviations in the digging direction from occurring, and when cutting is performed using the leading bit 14A and each trailing bit 14B, the trailing bit 14B Since a free surface exists in a part of the periphery of the bit, cutting resistance acts on the trailing bit 14B in the direction of moving it toward the free surface, but the free surface around each of the trailing bits 14B is Since they are arranged symmetrically with respect to the center line of the rock drill, even when cutting is performed using the leading bit 14A and each trailing bit 14B, there is no deviation in the direction of excavation by the rock drill.

Further, each trailing bit 14B attached to the front end of the intermediate rod 12D disposed on both sides of the central rod 12C is located at a position spaced the same distance rearward from the leading bit 14A attached to the front end of the central rod 12C. and an end rod 12E is arranged on the side opposite to the center rod 12C in each intermediate rod 12D, and each end rod 12
Each subsequent bit 14C attached to the front end of E
By arranging the bits at the same distance rearward from the trailing bit 14B, one leading bit 14A starts cutting the rock, and then both trailing bits 14B start cutting the rock at the same time. Subsequently, rock cutting can be started simultaneously using the succeeding bits 14C on both sides, thereby preventing swinging of the rock drill from when rock drilling is started using the preceding bit 14A until all the bits have been used to perform rock drilling. Therefore, rock drilling can be carried out in a stable state, and since the trailing bits 14B on both sides and the trailing bits 14C on both sides are arranged symmetrically with respect to the central rod 12C, cutting can be carried out using all the bits. Even during excavation, it is possible to prevent deviations from occurring in the excavation direction.

[Brief explanation of drawings]

1 to 3 show an embodiment of the first invention, in which FIG. 1 is a partially cutaway front view of a rock drill for continuous holes, FIG. 2 is a partially cutaway vertical side view thereof, FIG. 3 is an enlarged sectional view taken along line AA in FIG. 2. Fourth
The figure is a longitudinal sectional front view showing a part of a continuous hole rock drilling machine according to an embodiment of the second invention. FIG. 5 is a front view showing the arrangement of slit holes when digging a tunnel. In the figure, 11A and 11B are the rock drill main bodies, 12A and 12B are rods, 12C is a center rod, 12D is an intermediate rod, 12E is an end rod, 14A is a leading bit, 14B is a trailing bit,
14C is a succeeding bit, 15 is a spacing member, 16
20 is a guide shell frame, 21 is a support frame, 24 is an excavation driving device, 25 is a screw rod, 26 is a rod holding member, 2
8 is a female screw member, and 29 is a rod support portion.

Claims (1)

[Claims] 1. A rock jackhammer body in which a plurality of rods each having a bit attached to the front end are arranged in parallel at intervals in the lateral direction perpendicular to the excavation direction, and are connected to the rear ends of adjacent rods. In a continuous hole rock drilling machine, the large diameter portions are arranged offset in the excavation direction so that they do not overlap laterally, and the front end side of each rod is inserted into the hole in the spacing member. Rods 12A to which bits 14A are attached and rods 12B to which trailing bits 14B are attached to the front ends are aligned alternately and parallel to each other in the lateral direction perpendicular to the excavation direction, and rods 12B to which trailing bits 14B are attached are aligned laterally. Each trailing bit 14B is arranged so as to be located at both ends of the direction.
is a continuous hole rock drill located at the same distance rearward from the leading bit 14A. 2. A plurality of rods with bits attached to their front ends are arranged in parallel at intervals in the lateral direction perpendicular to the excavation direction, and the large diameter part of the rock drill body connected to the rear end of the adjacent rod is oriented in the lateral direction. In a continuous hole rock drilling machine, which is arranged offset in the excavation direction so as not to overlap, and the front end side of each rod is inserted through the hole in the spacing member, the central hole with the leading bit 14A attached to the front end Intermediate rods 12D with trailing bits 14B attached to the front ends are arranged in parallel on both sides of the rods 12C in the lateral direction, and trailing bits 14C are attached to the front ends of each intermediate rod 12D on the side opposite to the central rod 12C. The end rods 12E are arranged in parallel, and each trailing bit 14B is connected to the leading bit 14B.
A rock drill for continuous holes is located at the same distance rearward from A, and each trailing bit 14C is located at the same distance rearward from the trailing bit 14B.