JPH05263577A - Roof bolt - Google Patents

Abstract

PURPOSE:To connect a plurality of roof bolts to each other, and enable them to be used also for a hard bedrock by jointing male screws to be formed to the full length on the outer peripheries, to coupling spirally-fitting female screws in the counter directions to be formed on the inner peripheries. CONSTITUTION:On a crawler drill, a hollow penetration type drifter is mounted to be placed on the slope face of a road or the like. In this case, a plurality of roof bolts 3 are jointed to each other with a coupling 4 with the intermediate large diameter section outer-periphery consisting of 6 chamfering sections 9, and at the tip, a bit is fitted. Besides, at the full length of the outer periphery of a hollow pipe body 3a, male screws 6 are formed, and on the inner peripheries of both the end sections of the pipe body, female screws 7 are formed in the counter directions of the male screws 6. Then, the roof bolts 3 are rotated in the counter directions of the male screws 6 by the drifter, and when a drifter grasping section slips due to a hard bedrock, then it is advanced for excavation. As a result, on boring a hole through, the female screws 7 are fastened by being rotated in the counter direction of the male screws 6, and the jointing state is firmly retained, and they can be used as the long roof bolts 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof bolt driven into a slope in a construction for preventing slope collapse of a mountain or a road, and more particularly to a roof bolt connected to the slope.

[0002]

2. Description of the Related Art Conventionally, when driving a roof bolt, since the end of the bolt is hit and rotated by a drifter to pierce the ground, the guide cell must be longer than the roof bolt, and the size of the machine is large. Tended to change.

Therefore, in recent years, as shown in FIGS. 4 and 5, a male screw 21 is formed on the entire length of the outer circumference of a hollow roof bolt 20, and the middle portion of the roof bolt 20 is connected to the male screw 21 of the hollow through type drifter 22. A new method has been conceived in which a gripping portion that is screwed together is used to punch the ground by hitting and rotating in the opposite direction of the male screw 21 by the drifter 22.

At this time, the hollow through-type drifter 22 causes the roof bolt 20 to rotate in the direction opposite to that of the male screw 21. The reason why the roof bolt 20 is opposite to the male screw 21 even when the rock is hard and the gripping portion is slipped. This is because it is rotated in the forward direction, so that it is possible to move forward from the grip portion of the drifter 22 and dig forward. If it is rotated in the same direction as the male screw, if it slips, it will move backward from the grip and cannot dig.

Reference numeral 23 in the drawing denotes a coupling used when the roof bolt 20 is replenished, and a female screw 24 which is screwed with the male screw 21 of the roof bolt 20 is formed on the inner periphery thereof. Further, 25 is a bit attached to the tip of the earliest roof bolt 20.

[0006]

By the way, when a long roof bolt 20 is required, a plurality of roof bolts 2 are used.
0 is connected and used, but the conventional coupling 23 is used by being screwed into the outer periphery (that is, the male screw 21) of the end portion of the roof bolt 20 as described above.

Therefore, when the roof bolt 20 is rotated in the opposite direction to the male screw 21 by the drifter 22, the coupling 23 is loosened, so that the roof bolt 20 cannot be rotated in the above-mentioned direction. There was a problem that it was not possible to connect and punch.

[0008] Therefore, an object of the present invention is to provide a roof bolt which can be used by connecting a plurality of pieces even in hard rock.

[0009]

In order to achieve the above object, the structure of the present invention is such that a male thread is formed on the entire length of the outer circumference of a hollow tube, and the middle part of the tube is connected to the male thread of the hollow penetrating drifter. In a roof bolt that is gripped by a gripping portion that is screwed and that is hit and rotated in the direction opposite to the male screw by the drifter to make a hole in the ground, the inner periphery of the end of the hollow tube is opposite to the outer periphery of the male screw. It is characterized in that a female screw for coupling screwing in the direction is formed.

[0010]

According to the above construction, the connection is made by using the coupling screwed to the female screw of the roof bolt, so that the coupling will not be loosened even when the roof bolt is rotated in the direction opposite to the external screw of the outer periphery thereof.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 3, a hollow penetrating drifter 2 is mounted on a crawler drill 1, and a roof bolt 3 is driven on a slope G of a road or the like.

A plurality of roof bolts 3 (three in FIG. 3) are connected by a coupling 4 as shown in FIG. 1, and a bit 5 is attached to the tip of the frontmost roof bolt 3.

As shown in FIG. 2, in the roof bolt 3, a male thread 6 is formed on the entire outer circumference of the hollow tube body 3a, and the coupling 4 is screwed on the inner circumference of both ends of the tube body. A female screw 7 is formed in the opposite direction to the male screw 6, which is possible.

The coupling 4 has a male rod 8 which is screwed into the female screw 7 of the roof bolt 3 on the outer periphery of the small diameter portion of both ends of the hollow rod 4a, and the outer periphery of the intermediate large diameter portion is composed of six chamfered portions 9. ing.

With this structure, when the slope G or the like made of hard rock is drilled, the plurality of roof bolts 3 connected by the coupling 4 are connected to the male screw 6 by the hollow penetrating drifter 2. When rotated in the opposite direction, even if the grip of the drifter 2 slips due to hard rock, the roof bolt 3 rotates in the opposite direction of the male screw 6 and the drifter 2 rotates.
It is possible to move forward from the gripping part and dig.

Further, at this time, since the female screw 7 of the roof bolt 3 and the male screw 8 of the coupling 4 are in the opposite directions to the male screw 6 on the outer periphery of the roof bolt, the roof bolt 3 is used for the perforation.
When the screw is rotated in the opposite direction to the male screw 6, the female screw 7 is tightened, and the connected state is reliably maintained, so that it can be used as the long roof bolt 3.

[0017]

As described above, according to the present invention, a male screw formed on the entire length of the outer circumference and a female screw for coupling screwing in the opposite direction are formed on the inner circumference of the end portion of the roof bolt. It can be used by connecting to the main.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a roof bolt showing an embodiment of the present invention.

FIG. 2 is an explanatory view of an enlarged main part of the same.

FIG. 3 is also an explanatory diagram of a construction state.

FIG. 4 is an exploded perspective view of a conventional example.

FIG. 5 is an explanatory diagram similarly enlarging a main part.

[Explanation of symbols]

 3 Roof bolt 3a Hollow tube 4 Coupling 6 Male screw 7 Female screw 8 Male screw

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeo Kokubun 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Takahiko Ohara 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd.

Claims (1)

[Claims] 1. A male screw is formed on the entire length of the outer circumference of the hollow tubular body,
In the roof bolt, the middle portion of the tubular body is gripped by a gripping portion of the hollow through-type drifter that is screwed with the male screw, and the drifter punches the ground by hitting and rotating in a direction opposite to the male screw. A roof bolt, wherein a female screw for coupling screwing is formed on the inner circumference of the end of the pipe body in the opposite direction to the male screw on the outer circumference.