JPH0821178A - Jig for continuously excavated pit - Google Patents

Abstract

PURPOSE:To prevent the bending of excavated pits by inserting a cylindrical type guide member into a preceding pit and excavating the next pit along the guide member when the excavated pits are bored continuously while being partially overlapped in the same direction by a rotary bit through a non-blasting excavation, etc. CONSTITUTION:A cylindrical guide member 13 with an arcuate indentation 23, a bearing piece 15, a shaft member 33, an engaging piece 17, etc., is inserted into a preceding pit dug out by a rotary bit, and borne by the bearing piece 15. The rotary driving shaft 57 of the bit excavating the next pit is borne by the engaging piece 17 while the next pit is excavated along the arcuate indentation 23 of the guide plate, and an excavated pit is not curved. Subsequently, the same operation is repeated successively and continuous pits are dug out, and a cutting-plane line is formed. Accordingly, the ground can be excavated efficiently through non-blasting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when a plurality of holes having the same direction are drilled in rock or concrete by rotating a hole drilling bit while advancing a part of the holes. A jig for drilling.

[0002]

2. Description of the Related Art For example, when digging a tunnel by non-blast digging, as shown in FIG. 6, many crushing holes 3 are digged in a tunnel wall 1 and the tunnel wall 1 is divided into a plurality of regions. A slit 5 is formed, which forms a free surface. As shown in an enlarged view in FIG. 7, the slit 5 is formed by continuously drilling a plurality of holes 7 in the same direction with some of them overlapping. Specifically, when the diameter of the holes 7 is D, the holes 7 are drilled at a pitch d smaller than the diameter D, and the holes 7 overlap each other in the range of b.

[0003]

However, in the case of continuous drilling in this way, since the hole 7A previously drilled is partially overlapped with the next hole 7B, the next hole 7B is drilled. Depending on the directionality of the rod and the vibration of the drill bit, the holes may be bent in the direction of the previously drilled hole 7A, or may be bent in the opposite direction. Drilling a hole was troublesome, and there was a problem that work efficiency could not be improved. The present invention has been devised in view of the above circumstances, and an object of the present invention is to drill a plurality of holes in the same direction in rock, concrete, etc., efficiently and reliably by partially overlapping the holes. It is to provide a jig for drilling.

[0004]

To achieve the above object, according to the present invention, when a plurality of holes of the same direction are drilled in a rock or concrete, etc., by partially duplicating them, with a drilling bit. It is a jig for continuous drilling used for the main body part inserted into the previously drilled hole and the peripheral surface of the adjacent hole to be drilled next to the main body part A guide member having an arcuate guide surface portion, a support piece projecting from the base end side of the guide member, and having a hole into which a guide cell of a hole drilling machine is inserted, and a base end of the guide member. And an engaging piece formed with an engaging portion which is provided so as to project from the side and which is engaged with the driving shaft of the drill bit so as to be axially movable and rotatable.

[0005]

The hole drilling bit can be dug along the guide plate whose rotation is blocked, and the drive shaft is guided in the dug direction by the engaging portion, so that the drill bit can be moved in the same direction as the previously drilled hole. It is possible to efficiently and surely make holes by overlapping the portions.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A jig for continuous drilling according to the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view of a jig for continuous drilling,
FIG. 2 shows the same exploded perspective view. 11 is a jig for continuous drilling,
The continuous drilling jig 11 includes a guide member 13 inserted into the previously drilled hole 7A, a support piece 15 and an engaging piece 17 attached to the guide member 13. The guide member 1
Reference numeral 3 includes a cylindrical member 21 (main body), a guide plate 23 (guide surface portion) attached to the cylindrical member 21, and the like. The cylindrical member 21 is formed with a peripheral surface having a diameter that can be inserted into the drilled hole 7 and having a length larger than the depth of the drilled hole 7, and a notch 25 having a constant width is formed on a side portion of the cylindrical member 21. Are formed along the longitudinal direction of the cylindrical member 21.

The guide plate 23 is attached to the cylindrical member 21 so as to close the notch 25. As shown in FIG. 5, the guide plate 23 has a shape along the outer periphery of the adjacent hole 7B to be next drilled in a state where the cylindrical member 21 is inserted into the previously drilled hole 7A. Is formed by an arc surface whose radius is the center of the adjacent hole 7B. As shown in FIGS. 2 and 3, the guide plate 23 is attached to the cylindrical member 21 by a reinforcing piece 27 attached inside the cylindrical member 21.
Through. The reinforcing piece 27 includes an arc portion 2701 having a shape corresponding to the guide plate 23 and an arc portion 270.
The bent portion 2703 is formed on both ends of the cylindrical member 21. The bent portion 2703 is fixed to the inner surface of the cylindrical member 21 by welding or the like, and the guide plate 23 is fixed to the arc portion 2701 by welding or the like. Is attached to the cylindrical member 21.

The supporting piece 15 is attached to the cylindrical member 21. The support piece 15 is bent into an L shape, and the support piece 1
The base end of No. 5 is welded to the base end side of the cylindrical member 21 via the attachment piece 1501, and the guide hole 31 is formed at the tip of the support piece 15. The guide hole 31 is, as shown in FIG. 51
The guide cell 53 is formed with a diameter that allows axial movement.

A shaft member 33 is attached to the cylindrical member 21. The shaft member 33 is inserted from the base end side of the cylindrical member 21, and the mounting piece 35 attached to the shaft member 33 is fixed to the inner surface of the cylindrical member 21 by welding or the like, so that the shaft member 3
3 is attached to the cylindrical member 21, and the attachment piece 35 is attached to a location corresponding to the reinforcing piece 27. The engagement piece 17 is attached to a portion where the shaft member 33 projects from the cylindrical member 21. The engagement piece 17 includes a cylindrical portion 1701 through which the shaft member 33 is inserted, an arm portion 1703 protruding from the cylindrical portion 1701, and an engagement portion 1705 formed in a semicircular shape at the tip of the arm portion 1703. ,
The cylindrical portion 1701 is fixed to the shaft member 33 by welding or the like,
The engaging portion 1705 is formed with a diameter that allows the drive shaft 57 of the drill bit 55 to rotate and move in the axial direction. And
As shown in FIG. 5, the guide member 1 is inserted into the hole 7A that was previously drilled.
3 is inserted into the guide hole 31 of the support piece 15, and the hole drilling machine 51
Of the drilling bit 5 with the driving shaft 57 of the drilling bit 55 engaged with the engaging portion 1705.
5 is configured such that the center of the hole 5A is located at a position displaced by a distance d (see FIG. 7) from the previously drilled hole 7A.

Next, the case where the continuous hole 7, 7, ... Is drilled by using the continuous hole jig 11 will be described with reference to FIGS. 4 and 5. FIG. 4 is a side view of a continuous drilling jig in use, and FIG. 5 is a front view of the jig. First, the guide member 13 is inserted into the previously drilled hole 7A. Next, the guide cell 53 of the boring machine 51 is inserted into the guide hole 31 of the support piece 15,
The engaging portion 1705 is engaged with the drive shaft 57 of the drill bit 55. As a result, the hole drilling bit 55 is formed in the previously drilled hole 7
The center faces a portion which is slightly displaced from A by a distance d (see FIG. 7). In addition, the guide cell 53 is inserted into the guide hole 31 of the support piece 15, so that the guide member 13 is prevented from rotating. Then, the drill bit 51 is rotationally driven by the drill machine 51 to advance the drill bit 55.

At this time, the drill bit 55 can be dug along the guide plate 23, which is prevented from rotating, and the drive shaft 5
7 is guided in the direction of excavation by the engaging portion 1705,
Even if it receives various resistances and vibrations during excavation, as in the past,
The hole 7B can be drilled in the same direction as the previously drilled hole 7A without bending in the direction of the previously drilled hole 7A or bending in the opposite direction. Then, after drilling with the drill bit 55, the jig 11 for continuous drilling
By taking out from the hole 7B, the hole drilling hole 7B in the same direction as the previous hole drilling hole 7A is drilled with the hole drilling hole 7 and the hole drilling hole 7 partially overlapping. And in this way,
The continuous holes shown in FIG. 7 are formed by sequentially drilling adjacent holes 7.

Therefore, according to this embodiment, the drill bit 5
5 can be dug along the guide plate 23 of which rotation is blocked, and since the drive shaft 57 is guided in the dug direction by the engaging portion 1705, a plurality of holes 7 in the same direction are partially cut. It is possible to overlap and efficiently and reliably drill holes.

[0013]

As is apparent from the above description, the present invention is used for drilling a plurality of holes in the same direction in rock, concrete, etc. by using a drill bit by overlapping some of them. A jig for continuous drilling, which is a circle corresponding to the body part to be inserted into the previously drilled hole and the peripheral surface of the adjacent hole to be drilled next to the body part A guide member having an arc-shaped guide surface portion, a support piece projecting from the base end side of the guide member, in which a hole into which a guide cell of a hole drilling machine is inserted, and a base end side of the guide member are formed. Is projected,
The driving shaft of the drilling bit is provided with an engaging piece formed with an engaging portion that is rotatably engaged with the driving shaft. Therefore, the drill bit can be dug along the guide plate whose rotation is blocked, and the drive shaft is guided by the engaging portion in the drilling direction. It is possible to efficiently and surely drill a plurality of holes having the same orientation by overlapping a part of the holes without bending to the opposite side or bending in the opposite direction.

[Brief description of drawings]

FIG. 1 is a perspective view of a jig for continuous drilling.

FIG. 2 is an exploded perspective view of a jig for continuous drilling.

FIG. 3 is an exploded perspective view of a guide member.

FIG. 4 is a side view of a continuous drilling jig in use.

FIG. 5 is a front view of a continuous drilling jig in use.

FIG. 6 is a front view of a tunnel wall surface.

FIG. 7 is an enlarged view of a continuously drilled hole.

[Explanation of symbols]

 7 holes 11 jig for continuous drilling 13 guide member 15 support piece 17 engaging piece 1705 engaging portion 23 guide plate 31 guide hole 53 guide cell 55 drilling bit 57 drive shaft

Claims (1)

[Claims] 1. A jig for continuous drilling, which is used when drilling a plurality of holes of the same direction in a rock, concrete or the like by using a drilling bit by overlapping a part thereof. A guide member having a main body part to be inserted into the hole drilled in the main body part, and an arc-shaped guide surface part corresponding to the peripheral surface of an adjacent hole to be drilled next to the main body part; A support piece protruding from the base end side of the member and having a hole into which a guide cell of a hole drilling machine is formed; and a drive shaft of the hole drilling bit protruding from the base end side of the guide member in the axial direction. A jig for continuous drilling, comprising: an engaging piece having an engaging portion that is movably and rotatably engaged.