JPH0441692Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an auxiliary tool for drilling a trough hole.

[Prior Art] When laying power transmission cables and the like in tunnels, it is common practice to install the power cables in a disaster prevention trough made of fiber-reinforced plastic or fiber-reinforced concrete. In order to install this trough in a tunnel, first, a large number of vertical hardware are installed along the side walls of the tunnel at appropriate intervals perpendicular to the tunnel bed surface, and then the vertical hardware is installed perpendicularly to the vertical hardware in the tunnel. Facing the inside of the road, secure a metal holder (trough holder) to receive the trough. After that, the bottom of the trough is fixed onto this metal holder with bolts.

Since it is difficult to fix the metal fittings in the tunnel in the position according to the design drawings, bolt holes are drilled in the metal fittings in advance, but the bolt holes on the bottom of the trough are aligned on site. I have to open it.
Conventionally, the method of drilling bolt holes into this trough was
The method used was to mark the bottom of the trough through the bolt hole from below the metal holder, then move the trough, turn it over, and use the marked mark as a guide to drill the bolt hole.

[Problem that the invention aims to solve] The conventional method of drilling bolt holes in a trough is to turn the trough over, drill a hole, then turn the trough back over, place it on a metal holder, and align the bolt holes. There was a problem in that it involved extremely inefficient work of fixing with bolts.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and provides a columnar body that can be fitted into a bolt hole of a trough receiver through which a bolt hole for fixing a trough is formed. The present invention relates to an auxiliary tool for drilling a trough hole, characterized in that it has a communicating hole for drilling a trough hole in the center of a columnar body.

Hereinafter, the present invention will be explained based on the accompanying drawings.
1 and 2 are schematic perspective views for explaining a typical example of the present invention. Figure 1 1 shows a magnetic trough holder made of steel, etc. Figure 2 2 shows a non-magnetic trough holder made of stainless steel, synthetic resin, concrete, fiber-reinforced synthetic resin, fiber-reinforced concrete, etc. It is. For a magnetic trough receiver 1, an auxiliary tool 4 with a magnet 3 is preferred. That is, after the auxiliary tool 4 is fitted into the bolt hole 5 of the trough receiver 1, the auxiliary tool 4 can be fixed to the bottom surface of the trough receiver by the magnet 3. For a non-magnetic trough receiver 2, an auxiliary tool 7 provided with a presser 6 is preferable. That is, after the auxiliary tool 7 is fitted into the bolt hole 8 of the trough receiver 2, the auxiliary tool 7 can be fixed to the trough receiver with the presser tool 6.

The auxiliary tool of the present invention is formed of a columnar body (Fig. 1, 9, Fig. 2, 10) that can fit into the bolt hole of the trough receiver, and is used to drill a hole for the trough in the center of the columnar body. Communication hole (Fig. 1 11, Fig. 2 1
2). The columnar body may be a cylindrical body as shown in Fig. 1 9 and Fig. 2 10, or it may be a cylindrical body with a part of its periphery cut out in the length direction or width direction, or a bolt hole of a trough receiver. It may be a prism such as a triangular prism or a square prism that can be fitted into the prism.

The communication hole is for drilling the trough hole drilling position from the bottom of the trough, and a drill is inserted through this communication hole from the lower part of the trough receiver to drill a mark for drilling a bolt hole in the bottom of the trough. . This mark is the center of the bolt hole to be drilled in the bottom of the trough, and because of this mark, it is possible to drill the bolt hole in the bottom of the trough from the top of the trough. This mark is smaller than the actual bolt hole and can be easily drilled from the bottom of the trough receiver with a drill or the like.

The auxiliary tool of the present invention does not require fixing means to the trough receiver as shown in FIG. 1 3 and FIG. 2 6 as long as it is sufficiently tightly fitted into the bolt hole of the trough receiver. The material of the auxiliary tool may be the same as that of the trough receiver.

[Effects of the invention] By using the auxiliary tool of the invention, the work of drilling bolt holes in the trough can be performed efficiently with excellent dimensional accuracy. Unlike conventional methods, there is no complicated and dangerous work such as turning the trough inside out, and it is also superior in terms of safety.

[Brief explanation of the drawing]

1-2 are schematic perspective views for explaining a typical example of the present invention. 4...Auxiliary tool having magnet 3, 6...Press tool 6
Auxiliary equipment with.

Claims (1)

[Scope of utility model registration request] A trough hole drill, characterized in that it has a columnar body that can fit into a bolt hole of a trough receiver through which a trough fixing bolt hole is formed, and has a communicating hole in the center of the columnar body for drilling a trough hole drilling position. Auxiliary tool for drilling locations.