JPH0478445B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a duct opening method for opening a duct opening in an existing manhole, and a duct opening drilling method used for opening the duct opening. Regarding equipment.

[Prior art] Conventionally, when opening a duct in an existing manhole, in order to prevent cables such as telephone lines from being damaged, the cables were protected by covering them in advance, and then the cables were protected using chisels and hammers. A duct opening of a predetermined diameter is created by manually drilling a through hole, then setting a duct sleeve in the through hole, and filling the periphery with a filling electrical material.

[Problems to be Solved by the Invention] However, in the conventional duct opening method, the through hole was manually drilled by an operator using a chisel and a hammer. Not only does this work take time and effort, placing a heavy burden on the worker, but it also causes the work to be inefficient because the portion of the concrete to be destroyed must be larger than necessary.

Further, the drilling work in the manhole is not only carried out continuously for a long time in a narrow working space, but also has the problem of creating a poor working environment because concrete dust is generated during the breaking work.

The present invention has been made in view of such conventional problems, and it is possible to drill the minimum necessary through-holes in a short time by mechanical work without generating concrete dust. The aim is to solve the above problems.

[Means for Solving the Problems] In order to achieve the above object, the present application provides a drill in which a guide disk is attached to the planned opening position of the duct opening of an existing manhole, and a cylindrical part is fitted onto the guide disk. to drill a guide hole of an appropriate depth at the planned hole opening position, move the drill backward to remove the guide disk, move the drill forward to form a through hole, and Insert the duct sleeve inside the
Provides as a specified invention a method for opening a duct opening in an existing manhole, which is characterized by filling the gap in the through hole outside the duct sleeve with a filling electrical material, and also provides a drill that can be detachably attached to an appropriate location in the existing manhole. a stand; a drive motor movably attached to the drill stand; a drill attached to the output shaft of the drive motor and having a cylindrical bit; A combined invention provides a duct opening drilling device for an existing manhole, characterized in that it is equipped with a guide disk for guiding the bit.

[Function] Therefore, in the specific invention according to the present application, a guide disk is attached to the position where the duct opening is to be opened,
Guide the drill with the guide disc to drill a through hole, insert a duct stove into the through hole, and fill the surrounding area with filler to open the duct opening in a good working environment. In addition, in the combined invention, a drilling device is configured including a drill stand, a drive motor, and a drill, and the drilling device is installed at an appropriate location in an existing manhole to drill the through hole. The mouth opening method can be performed efficiently.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a punching device according to the present invention.

First, to explain the structure, 1 in the figure is a drill stand, and this drill stand 1 consists of a stand base 3 having a vacuum suction pad 2 formed of a rubber-like elastic material such as rubber or soft plastic on the lower surface, and the stand. It has a drill support 4 erected on a base 3, and a support arm 5 supported on the drill support 4 in a cantilevered manner so as to be movable in the vertical direction.

Adjustment screws 6 are provided at the four corners of the stand base 3 and pass through the stand base 3 in the vertical direction, and the levelness of the stand base 3 can be adjusted by adjusting the height of these screws. The support arm 5 can be fixed at any height position of the drill support 4 by a fixing screw 7 that passes through the drill support 4 in the lateral direction and whose tip end is screwed into the base of the support arm 5. Further, the support arm 5 is provided with a rack shaft portion 8 extending in the axial direction.

9 is a motor base supported movably in the axial direction on the support arm 5; 10 is a handle rotatably supported on the motor base 9;
A pinion (not shown) is provided at the tip of a, and the pinion meshes with the rack shaft 8, and by turning the handle 10, the pinion meshes with the rack shaft 8. The motor base 9 moves in a direction corresponding to the direction of rotation of the handle 10. The motor base 9 is equipped with a drive motor 13 having an electric motor 11 and a speed reducer 12 whose rotating shaft (not shown) is connected to an input shaft (not shown).

A drill 15 is attached to the output shaft 14 of the drive motor 13 for drilling into concrete parts such as the side wall, bottom, ceiling, etc. of the existing manhole. Drill 15
The bit 16 has a cutting edge made of diamond or the like arranged in an annular shape at the tip, a cylindrical tube 17 that is screwed into one end of the bit 16, and the tube 17.
The output shaft 14 is fixed to the output shaft 14 by the adapter 18, which is screwed onto one end of the output shaft 14.

Further, 20 is a vacuum device that generates vacuum, and 21 is a hose that connects the vacuum device 20 with a chamber (not shown) formed inside the vacuum suction pad 2. When the vacuum device 20 is driven, the chamber inside the vacuum suction pad 2 is brought into a vacuum state by the vacuum, and the vacuum suction force fixes the drill stand 1 to any position within the manhole such as the wall, floor, ceiling, etc. can do.

Next, a method of drilling a duct opening in the concrete wall of an existing manhole using the above-mentioned drilling device will be described with reference to the embodiments shown in FIGS. 2 to 7.

First, as shown in Fig. 2, use a hand drill or the like to drill a predetermined small hole 23 at the position where the duct opening is to be made (the planned opening position of the duct opening). Nut 24 formed into a cylindrical shape
bury it. Then, as shown in FIG. 3, the guide disk 26 is attached to the concrete wall by screwing the shaft portion 25 into the buried nut 24. Shaft 25
can be formed, for example, by a bolt with a head, and the guide disk 26 is integrally formed by fixing the head to the center of the disk by welding or the like.

Next, place the drilling device at an appropriate location such as the floor in the existing manhole, drive the vacuum device 20 to suck air from the chamber in the vacuum suction pad 2, and fix the drill stand 1 by suctioning it to the floor, etc. do. Thereafter, the height of the support arm 5 is adjusted and fastened to the drill support 4 so that the bit 16 at the tip of the drill 15 faces the guide disk 26.

Next, turn the handle 10 to remove the motor base 9.
is moved forward, and the drill 15, which is rotated by the drive motor 13, is fitted onto the guide disk 26.
Then, the bit 16 at the tip is pressed against the concrete side wall, and a guide hole 27 of an appropriate depth is bored. In this case, since the guide disk 26 prevents the drill 15 from swinging and ensures rotation at a predetermined position, the drill 15 will not be blown off even when, for example, a sudden change in hardness occurs, and the initial Drilling work can be carried out.

Next, once the drill 15 is retreated and the guide disk 26
Thereafter, as shown in FIGS. 1, 4, and 5, the drill 15 is advanced again to drill the through hole 28, and then the drill 15 is retreated. When the drill 15 is moved forward again, the drill 15 is guided by the guide hole 27, so the drill 15
The hole can be drilled safely to the end without causing any runout.

Note that when drilling the through hole 28 with the drill 15, water is injected into the cutting edge portion thereof. This not only prevents the generation of dust during drilling operations, but also facilitates the discharge of chips and improves cutting efficiency.

Subsequently, as shown in FIGS. 5 and 6, a duct sleeve 30 having a water stop material 29 (for example, a sealing member made of an annular rubber-like elastic body) fitted on one end side is inserted into the through hole 28. Then, filler material 32 such as mortar is filled into the gap of the through hole 28 on the outside of the duct sleeve 30 using, for example, a filling tool 31.
Fill it.

The stuffing tool 31 includes a receiving plate 33 on which a filler 32 is placed, and a push rod 34 that pushes out the filler 32 and stuffs it into the gap. As shown in FIG. 8, the receiving plate 33 includes a receiving plate main body 35 bent into a semi-cylindrical shape, an annular portion 36 provided at one end thereof, and a convex side of the receiving plate main body 35 on both sides in the width direction. It has a bent side piece 37 and an L-shaped grip part 38 with one end fixed to the inner surface of the receiving plate main body 35.
The filler material 32 is placed on 5.

The push rod 34 also has a head 40 that is curved into a shape that matches the arc of the receiving plate main body 35, and a rod portion 41 that has one end connected to the center of the head 40.
and a handle portion 4 connected to the other end of the rod portion 41.
2.

The stuffing tool 31 is used, for example, as follows. First, an appropriate amount of filler 32 is placed on the upper surface of the receiving plate main body 35 of the receiving plate 33. Next, the handle part 42 of the push rod 34 is grasped and pressed, and the filler material 32 is pushed out into the above-mentioned gap with the head 40 facing the rear of the filler material 32. Then, the filling material 32 is sufficiently tamped with the ramming rod 34.

Thereby, as shown in FIG. 7, a duct opening 44 penetrating the concrete wall can be opened.

In the above embodiment, an example was explained in which the drill stand 1 is installed on the floor and a duct opening is drilled in a concrete side wall, but the present invention is not limited to this. The stand 1 may be fixed and the duct opening may be opened in the side wall, ceiling, floor, etc.

Further, in the above embodiment, the electric motor 11
Although an example has been described in which the drive motor 13 is configured using the speed reducer 12, the present invention is not limited thereto, and it goes without saying that other types of motors such as a pneumatic motor, a hydraulic motor, etc. can be used. Furthermore, the support arm 5 in the above embodiment may be omitted, and the motor base 9 may be movably installed on a drill support provided with a rack shaft.

[Effects of the Invention] As explained above, according to the specific invention of the present application, a guide disk is attached to the position where the duct opening is to be drilled to guide the drill, and a guide hole of an appropriate depth is drilled. After that, a through hole is formed, a duct sleeve is inserted into the through hole, and the outside is filled with filler, so the minimum necessary through hole can be efficiently drilled in a short time by machine work. This provides the effect that the duct opening can be opened efficiently with less burden on the operator.

In addition, in the combined invention of the present application, the drilling device is configured with a drill stand, a drive motor, a drill, and a guide disk, so the structure is simple and
The effect is that it is possible to provide a device that can efficiently perform the above-mentioned duct opening operation.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a duct opening drilling device according to the present invention, and FIGS. 2 to 7 are diagrams for explaining the duct opening drilling method of the present invention. Diagram showing holes in the planned hole positions, 3rd
The figure shows the guide disk attached to the planned hole opening position, Figure 4 shows the through hole being penetrated with a drill, and Figure 5 shows the duct sleeve being inserted into the through hole. , FIG. 6 is a diagram showing a state in which the filling material is filled using a filling tool, FIG. 7 is a diagram showing the opening state of the duct opening, and FIG. 8 is a perspective view of the receiving plate shown in FIG. 6. FIG. 9 is a perspective view of the thrust rod also shown in FIG. 6. 1: Drill stand, 2: Vacuum suction pad,
3: Stand base, 4: Drill support, 5: Support arm, 8: Rack shaft, 9: Motor base, 1
0: Handle, 11: Electric motor, 12: Reduction device, 13: Drive motor, 15: Drill, 16: Bit, 17: Tube, 20: Vacuum device,
26: Guide disk, 27: Guide hole, 28: Through hole, 29: Seal member, 30: Dust sleeve,
31: Filling tool, 32: Filling material, 33: Receiver plate,
34: Push rod, 44: Duct opening.

Claims (1)

[Scope of Claims] 1. A guide disk is attached to the planned hole opening position of the duct opening of an existing manhole, and a drill having a cylindrical portion fitted onto the guide disk is used to drill the hole to an appropriate depth at the planned hole opening position. After drilling a guide hole and retracting the drill to remove the guide disk, the drill is advanced to form a through hole, inserting a duct sleeve into the through hole, and inserting a duct sleeve into the through hole. A method for opening a duct opening in an existing manhole, characterized by filling a gap in a through hole with a filler. 2. A drill stand that can be detachably attached to an appropriate location in an existing manhole, a drive motor that is movably attached to the drill stand, a drill that is attached to the output shaft of the drive motor and has a cylindrical bit, and a duct. A device for drilling a duct opening in an existing manhole, comprising a guide disk that guides the bit that is attached to the planned opening position of the opening and fitted onto the outside. 3. The drill stand has a stand base having a vacuum suction pad on the lower surface, a drill support erected on the stand base, and a support arm supported in a cantilevered manner on the drill support so as to be movable in the vertical direction. 3. The duct opening drilling device for an existing manhole according to claim 2, wherein the drive motor is attached to a support arm of the device.