JP2000240079A - Drill device fixing jig for boring anchor bolt hole on manhole steel cover receiving frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To horizontally bore anchor bolt holes on a receiving frame easily and reliably by fixing a drill device for boring the anchor bolt holes of a drop preventing net on the manhole steel cover receiving frame in the receiving frame reliably and horizontally. SOLUTION: This fixing jig horizontally fixes a drill device having a fixed plate perpendicular to a drill blade at the tip for boring the anchor bolt holes of a drop preventing net on a manhole steel cover receiving frame in the receiving frame. The fixing jig is constituted of a mount member 7 mounted on the inside flange of the receiving frame or on the upper face of the receiving frame, a base plate 8 fixed below the mount member 7, and multiple drill device fixing members 9 vertically fixed between the inner face of the mount member 7 and the base plate 8 and having a planar U-shape. Each fixing member 9 is fixed with a web faced inward, a drill blade insertion hole 9A is formed on the web, and the fixed plate of the drill device is inserted into a vertical groove 9B formed between the flanges of the fixing member 9 from above the vertical groove 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing jig for a drill device for drilling an anchor bolt hole in a manhole iron cover, and more particularly, to a method for drilling a fall prevention net anchor bolt hole in a manhole iron cover. Drill equipment,
It can be securely fixed horizontally in the receiving frame, and thus,
The present invention relates to a fixing jig for a drill device capable of easily and reliably drilling an anchor bolt hole horizontally in a receiving frame.

[0002]

2. Description of the Related Art For example, when a large amount of rainwater flows into a sewer at a time during a flood, the iron cover of a manhole may come off a receiving frame due to the water pressure.

[0003] As described above, when the iron cover comes off from the receiving frame and the road surface sinks below the surface of the water, there is a risk that a person walking on the road may accidentally fall into the manhole and cause a serious accident.

[0004] Therefore, measures have been taken to solve such a problem. Hereinafter, this means is referred to as a conventional technique and will be described with reference to the drawings.

FIG. 8 is a sectional view showing the prior art, and FIG.
It is a top view which shows a prior art.

8 and 9, reference numeral 1 denotes a manhole, 2 denotes an iron cover of the manhole 1, 3 denotes a receiving frame into which the iron cover 2 is fitted, and 4 denotes a fall prevention net attached to the receiving frame 3. is there.

The fall prevention net 4 is made of a resin rope knitted in a lattice shape, and is mounted in the receiving frame 3 by hanging the four corners on eyebolts 4 screwed into the receiving frame 3.

By attaching the fall prevention net 4 in the receiving frame 3 in this manner, even if the iron cover 2 comes off from the receiving frame 3, it is possible to prevent a person from falling into the manhole 1 beforehand. Can be.

[0009]

However, the above-mentioned prior art has the following problems. That is, it is good to screw the eyebolt 4 for the fall prevention net into the receiving frame 3 from the beginning. However, when screwing the eyebolt 4 into the existing receiving frame 3, a hole is made horizontally in the receiving frame 3 by a drill, and a tap is cut. The eye bolt 4 had to be screwed.

[0010] However, it is extremely difficult to perform a drilling operation into a manhole in a narrow space, and considerable skill is required to make a hole for the eyebolt 4 horizontally and accurately at a position where it is positioned. In short, it was not an easy task for everyone.

Therefore, according to the present invention, a drill device for drilling the anchor bolt holes of the fall prevention net into the manhole iron cover receiving frame can be securely fixed horizontally in the receiving frame, and thus easily and reliably. An object of the present invention is to provide a fixing jig for a drill device that can horizontally drill an anchor bolt hole in a receiving frame.

[0012]

According to the first aspect of the present invention,
For drilling an anchor bolt hole of a fall prevention net in a manhole iron cover receiving frame, a fixing device in which a fixing plate is mounted at a right angle to the drill blade in front of the drill blade to horizontally fix the drilling device in the receiving frame. In the fixing jig, a mounting member mounted on the inner flange of the receiving frame or the upper surface of the receiving frame, a bottom plate fixed below the mounting member, and an inner surface of the mounting member and the bottom plate. A plurality of fixing members for a drilling device having a flat U-shape fixed vertically between the fixing members, wherein the fixing members fix the webs to each other inward, and the web includes a drill blade insertion hole. Is formed, and the fixing plate of the drill device is inserted from above the vertical groove into a vertical groove formed between the flanges of the fixing member.

According to a second aspect of the present invention, the placing member is
It consists of a ring-shaped plate having the same outer diameter as the outer diameter of the inner flange of the receiving frame, and the bottom plate is made of a circular plate having the same outer diameter as the inner diameter of the ring-shaped plate. In particular, it has features.

According to a third aspect of the present invention, the placing member is
The bottom plate is made of a circular plate having the same outer diameter as the inner diameter of the ring-shaped plate, and the bottom plate is formed of a circular plate having the same outer diameter as the outer diameter of the upper surface of the receiving frame. It is characterized by the following.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fixing jig for a drill device for drilling an anchor bolt hole in a manhole iron cover receiving frame according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a fixing jig for a drill device of the present invention, FIG. 2 is a sectional view showing a state where the fixing jig for a drill device of the present invention is installed in a receiving frame, and FIG. FIG. 4 is a front view showing a drill device attached to the fixing jig of the present invention. FIG. 4 is a side view showing a fixing plate of the drill device.
FIG. 6 is a front view showing a state in which a drill is attached to the fixing jig of the present invention to make a hole, FIG. 6 is a partial cross-sectional view showing a state in which an anchor bolt is inserted into an anchor bolt hole,
FIG. 7 is a partial cross-sectional view showing a state in which a fall prevention net is attached to the anchor bolt via a carabiner.

1 to 7, reference numeral 1 denotes a manhole, 3 denotes a receiving frame into which an iron cover is fitted, and 6 denotes a fixing jig for a drill device according to the present invention.

In the fixing jig 6 for a drill device of the present invention, reference numeral 7 denotes a mounting member mounted on the inner flange 3A of the receiving frame 3. It is made of a steel ring-shaped plate having the same outer diameter as the outer diameter of the inner flange 3A of the receiving frame 3.
The placing member 7 may be placed on the upper surface 3B of the receiving frame 3. In this case, the steel ring-shaped plate as the mounting member 7 has the same outer diameter as the outer diameter of the upper surface 3B of the receiving frame 3. The mounting member 7 does not necessarily have to be a continuous ring-shaped plate.

Reference numeral 8 denotes a bottom plate fixed below the mounting member 7. The bottom plate 8 is made of a steel circular plate having the same outer diameter as the inner diameter of the ring-shaped plate, and has a plurality of openings 8A for reducing the weight.

Reference numeral 9 denotes a plurality of (in this example, four) fixing members for a drilling device, which are vertically fixed between the inner surface of the mounting member 7 and the bottom plate 8 and have a U-shape in plan view. Fixing member 9
Are fixed to each other with the webs facing inward, and the web has a drill blade insertion hole 9A formed in a vertically long shape. A fixing plate of a drill device described later is inserted into the vertical groove 9B between the flanges of the fixing member 9. On the upper surface of the web of the fixing member 9, a semicircular groove 9C into which a guide rod of a drill device 10 described later is fitted is formed. Reference numeral 10 denotes a plurality of reinforcing plates fixed between the placing member 7 and the bottom plate 8.

Reference numeral 11 denotes a drill device fixed to the fixing device 6 for a drill device of the present invention. The drill device 11
As shown in FIGS. 3 and 4, a drill body 12 having a drill bit 13, a holding member 14 for holding the drill body 12, a guide rod 15 having a circular cross section for guiding the holding member 14, A fixed plate 16 fixed at a front end of the guide rod 15, that is, at a right angle to the guide rod 15 in front of the drill blade 13 and having a drill blade insertion groove 16 </ b> A formed at a lower end thereof;
The lever 18 moves the holding member 14 in the direction of the fixing plate 16 together with the drill body 12 against the elastic force of the spring 17 along the guide rod 15.

The drill device 11 configured as described above
Is fixed to the fixing jig 6 of the present invention and the anchor bolt hole 19 is formed in the receiving frame 3 as follows.

First, as shown in FIG. 2, the mounting member 7 is placed on the inner flange 3A of the receiving frame 3, and the fixing jig 6 of the present invention is set in the receiving frame 3. Next, as shown in FIG. 5, the fixing plate 16 of the drill device 11 is inserted into the predetermined vertical groove 9B of the fixing member 9 from above. At this time, since the guide rod 15 of the drill device 11 fits into the groove 9C of the fixing member 9, the drill device 11 is stably and surely horizontally fixed by the fixing jig 6.

After the drill device 11 has been fixed to the fixing jig 6 in this manner, the lever 18 of the drill device 11 is pulled toward the user while operating the drill body 12 against the elastic force of the spring 17. . As a result, the drill body 12 moves along the guide rod 15 and the drill blade 13
Are the drill blade insertion hole 9A of the fixing member 9 and the fixing plate 16
And advances horizontally through the drill blade insertion groove 16A.

Thus, the anchor bolt hole 19 can be reliably and horizontally formed in the receiving frame 3 without entering the manhole in a narrow space as in the related art. In addition, the drilling position is accurately positioned. This operation is performed for each fixing member 9.

When the anchor bolt holes 19 are formed in the receiving frame 3 in this manner, the anchor bolts 20 as shown in FIG. 6 are inserted into the anchor bolt holes 19. The anchor bolt 20 has a retaining effect due to the expansion action of the distal end portion by the insertion of the expansion pin 21.

When the anchor bolt 20 is fixed to the receiving frame 3 by inserting the extension pin 21, the carabiner connecting member 22 is screwed into the head of the anchor bolt 20, as shown in FIG. Carabiner 2 attached to four corners of fall prevention net 4
Insert 3. Thereby, the fall prevention net 4 is attached to the receiving frame 3 via the carabiner 23, the connecting member 22 and the anchor bolt 20.

[0028]

As described above, according to the present invention, a drill device for drilling the anchor bolt holes of the fall prevention net in the manhole iron cover receiving frame can be accurately and horizontally fixed in the receiving frame. it can. Therefore, there is provided a useful effect that the anchor bolt hole can be easily and reliably formed horizontally at the determined receiving frame position.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fixing jig for a drill device of the present invention.

FIG. 2 is a cross-sectional view showing a state where the fixing jig for a drill device of the present invention is installed in a receiving frame.

FIG. 3 is a front view showing a drill device attached to the fixing jig of the present invention.

FIG. 4 is a side view showing a fixing plate of the drill device.

FIG. 5 is a front view showing a state where a drill device is attached to the fixing jig of the present invention to make a hole.

FIG. 6 is a partial sectional view showing a state where an anchor bolt is inserted into an anchor bolt hole.

FIG. 7 is a partial sectional view showing a state in which a fall prevention net is attached to the anchor bolt via a carabiner.

FIG. 8 is a sectional view showing a conventional technique.

FIG. 9 is a plan view showing a conventional technique.

[Explanation of symbols]

 1: Manhole 2: Iron cover 3: Receiving frame 3A: Inner flange of receiving frame 3B: Upper surface of receiving frame 4: Fall prevention net 5: Eye bolt 6: Fixture of the present invention 7: Mounting member 8: Bottom plate 8A: Opening 9: Fixing member 9A: Drill blade insertion hole 9B: Vertical groove 9C: Semicircular groove 10: Reinforcement plate 11: Drill device 12: Drill body 13: Drill blade 14: Holding member 15: Guide rod 16: Fixed plate 16A: Drill blade Insertion hole 17: Spring 18: Lever 19: Anchor bolt hole 20: Anchor bolt 21: Expansion pin 22: Carabiner connecting member 22B: Carabiner insertion hole 23: Carabiner

Claims (3)

[Claims] 1. A drill device having a fixing plate mounted at a right angle to the drill blade in front of a drill blade for drilling an anchor bolt hole of a fall prevention net in a manhole iron cover receiving frame. In a fixing jig for fixing to the mounting member, a mounting member mounted on the inner flange of the receiving frame or on the upper surface of the receiving frame, a bottom plate fixed below the mounting member, Consisting of a plurality of flat-shaped U-shaped fixing members for a drilling device fixed vertically between an inner surface and the bottom plate, the fixing members fix webs inwardly to each other, and the web includes A manhole iron cover, wherein an insertion hole for a drill blade is formed, and the fixing plate of the drill device is inserted into a vertical groove formed between flanges of the fixing member from above the vertical groove. In the receiving slot Fixture for drilling device for drilling Nkaboruto hole. 2. The mounting member according to claim 1, wherein the mounting member comprises a ring-shaped plate having an outer diameter that is the same as an outer diameter of the inner flange of the receiving frame, and the bottom plate has an inner diameter that is the same as the inner diameter of the ring-shaped plate. The fixing jig according to claim 1, wherein the fixing jig is made of a circular plate having an outer diameter. 3. The mounting member according to claim 1, wherein the mounting member comprises a ring-shaped plate having an outer diameter that is the same as the outer diameter of the upper surface of the receiving frame, and the bottom plate has an outer diameter that is the same as the inner diameter of the ring-shaped plate. The fixing jig according to claim 1, wherein the fixing jig is formed of a circular plate having a diameter.