JP2001329554A - Hole drilling method for concrete structure and concrete core cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for drilling a hole in a wall of a concrete structure, located in the ground, from its inside. SOLUTION: A concrete core cutter 26 capable of being disassembled into a plurality of parts in the peripheral direction is carried into the concrete structure 16 in a disassembled condition through its inlet, and the wall 18 of the concrete structure is cut by the concrete core cutter assembled in the concrete structure to drill a hole on the wall 18 of the concrete structure 16 provided in the ground and having the inlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for piercing a concrete structure having an entrance and installed in the ground, and a concrete core cutter used for the method.

[0002]

2. Description of the Related Art For example, a connecting portion between a manhole, which is one of concrete structures installed underground, and a pipe connected to the manhole is made flexible, thereby receiving a live load or seismic force. In order to prevent a pipe having a smaller strength than a manhole from being easily destroyed when relative movement occurs between the two, a concrete core cutter cuts the skeleton (wall) of the manhole so that the pipe is not broken. It has been proposed to form an annular gap around the perimeter and then to place an elastically deformable water-stop material in the gap.

[0003] All that is required for this cutting is to bring the concrete core cutter into the manhole through the manhole entrance and operate it. Since the most common entrance inside diameter of manholes in Japan is 600 mm, the concrete core cutter must be able to be introduced through such small entrances.

[0004] Such a situation arises when drilling a wall of a concrete structure such as a basement, or when drilling a concrete structure such as a horizontal hole extending from an existing tunnel to form another horizontal hole branching therefrom. Also exists in.

[0005] However, when the diameter of the hole to be drilled is larger than the entrance of the concrete structure, so that it is not possible to carry the concrete core cutter into the concrete structure through the entrance, An open-cut method (open cut) for digging the ground around the structure is required, and it is necessary to perform drilling by work from the outside of the concrete structure. In this method, there is a limitation due to work time, traffic conditions, and the like, and only enables drilling work in a special area.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for perforating a wall of a concrete structure installed underground.
It is an object to provide a method and apparatus for performing from inside.

[0007]

SUMMARY OF THE INVENTION The present invention is a method of drilling a wall of a concrete structure having an entrance provided in the ground, comprising a concrete core cutter which can be disassembled into a plurality of pieces in a circumferential direction. The concrete structure is carried into the concrete structure through its entrance in a disassembled state, and a wall of the concrete structure is cut by the concrete core cutter assembled in the concrete structure.

[0008] The concrete core cutter includes a ring-shaped member and a cylindrical cutter body detachably connected to the ring-shaped member, and the cutter body is provided with a plurality of circumferentially detachably connected cutter bodies. It may consist of a body part, each body part having a number of bits arranged at its free end.

The ring-shaped member has a flange portion, and each frame portion has an end portion detachably connected to the flange portion, and each frame portion extends circumferentially on an outer peripheral surface thereof. It may have a groove, and all the frame portions may be connected by a band-shaped member arranged in the groove.

[0010] Adjacent frame portions may be connected to each other by bolts, and the length of the bolts may be smaller than the thickness dimension of the bit in the radial direction of the cutter frame.

The bit may be made of, for example, a diamond tip.

[0012]

According to the present invention, a concrete core cutter, which can be disassembled into a plurality of pieces in the circumferential direction, is carried in a disassembled state into a concrete structure such as a manhole, a basement, or a lateral hole connected to a tunnel through its entrance. However, by assembling in the concrete structure, it is possible to perform a drilling operation by the concrete core cutter in the concrete structure.

Therefore, it is not necessary to excavate the ground around the concrete structure to perform the drilling operation. Also, for this reason, the drilling operation can be performed irrespective of the area, that is, regardless of whether the area is an urban area or a residential area, so that the operation efficiency can be increased and the operation cost can be reduced.

Since the concrete core cutter can be disassembled into a plurality in the circumferential direction, even if the concrete core cutter itself has a size that does not pass through the entrance of the concrete structure, it is disassembled. It can be brought into the concrete structure through its entrance in the laid state.

[0015] A ring-shaped member and a tubular cutter body detachably connected to the ring-shaped member, the cutter body comprising a plurality of body parts connected separably in the circumferential direction, For a concrete core cutter having a number of bits with a skeleton part disposed at its free end, the ring-shaped member and the skeleton part, which are constituent elements thereof, are separated and disassembled individually through the entrance of the concrete structure. It can be easily brought into an object, and these elements can be easily assembled in the concrete structure.

Further, when the body portion of the cutter body has an end portion detachably connected to a flange portion provided on the ring-shaped member, the frame portion is attached to the ring shape at the time of assembly. By arranging them side by side along the flange portions of the members, they can be easily made into a cylindrical state.

The skeleton part assembled into a cylindrical shape includes:
These can be connected to each other by fastening them with a band-shaped member. Since the band-shaped member is arranged in a groove provided on the outer peripheral surface of the skeleton portion and does not protrude from the groove, it does not hinder cutting.

Even when the frame portions are connected to each other by bolts, the bolts have a total length smaller than the thickness of the bit in the diameter direction of the cutter frame, and do not hinder cutting.

Further, the connection between the frame portions can be easily performed by both the band-shaped member and the bolt. It is desirable that the chip disposed at the free end of the skeleton portion is a diamond chip having high durability and good machinability of concrete.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The drilling method according to the present invention and a concrete core cutter used in the method are applied to a concrete structure having an entrance provided in the ground such as a manhole, a basement, or a horizontal hole connected to a tunnel. You.

The concrete core cutter can be disassembled into a plurality of pieces in the circumferential direction, and the perforations in the walls of the concrete structure can be carried into the concrete structure through the entrance in a disassembled state. Using the concrete core cutter assembled in the above.

Hereinafter, the drilling method and the concrete core cutter according to the present invention are applied to the manhole which is one of the concrete structures, in particular, the connection between the manhole and a sewer pipe is made flexible. A representative description will be given in connection with an example applied when performing.

First, referring to FIG. 1 and FIG. 2, two sewer pipes 10 and 12 installed underground and opposed to each other.
Are connected at their open ends 14 to manholes 16 buried in the ground and open into the manholes.

Each sewer pipe 10, 12 is a concrete pipe,
It consists of plastic pipes, ceramic pipes, etc. Manhole 16
It has a concrete frame 18 that defines the side walls and a concrete bottom plate 20.

The open end 14 of the sewer pipe is received in a circular opening 22 provided in the lower part of the manhole body 18 and is fixed to the body 18 with an adhesive (not shown), whereby the manhole is closed. It is attached and connected to the frame 18.

In some cases, the sewer pipe is attached to a lower position of the manhole body 18, not shown in the drawing, but at a height higher than this. Further, three or more sewer pipes may be connected to one manhole (see FIG. 21).

The above-mentioned flexibility is applied to a connecting portion 24 between each sewer pipe 10, 12 and the manhole 16, that is, an interconnecting portion between the open end 14 of each sewer pipe and the manhole body 18. The pipe in the connection part to be flexible may be a cable pipe through which a cable such as a communication line or a power line passes, instead of the sewer pipe.

To make the connecting portion 24 flexible, a concrete core cutter 26 is carried into the manhole 16 through an entrance (not shown) of the manhole 16 (see FIGS. 1 and 2).
The manhole body 18 is then cut by a concrete core cutter 26, thereby forming an annular gap 27 around the sewer pipe 10 (more specifically, around the open end 14 of the sewer pipe 10) (FIGS. 3 and 4). 4), and thereafter, an elastically deformable water-stop material (not shown) is disposed in the gap 27.

As the concrete core cutter 26, one having an inner diameter slightly larger than the diameter of the sewer pipe 10 is selected.

Since the concrete core cutter 26 can be disassembled into a plurality in the circumferential direction as described later,
Even if the inside diameter of the manhole 16 is larger than the diameter of the entrance, the manhole 16 can be transported into the manhole 16 through the entrance by disassembling it.

Since the manhole frame 18 usually has a larger inner diameter than its entrance, the manhole 16
It is possible to easily assemble the concrete core cutter 26 in the inside.

The cutting of the skeleton 18 by the concrete core cutter 26 is performed by disposing the concrete core cutter 26 on the extension of the axis of the sewer pipe 10 (FIGS. 1 and 2), and moving the concrete core cutter 26 along the axis. 10 and rotating about said axis (FIGS. 3 and 4).

In the illustrated example, before the concrete core cutter 26 is loaded into the manhole 16 so that the concrete core cutter 26 is disposed on the sewer pipe 10 on the extension of the axis of the sewer pipe, the bottom plate 20 of the manhole is placed. Is dug down to a position below the open end 14 of the sewer pipe.

However, when the open end 14 of the sewer pipe is open at a position higher than the lower part of the manhole frame 18 instead of the lower part thereof, more specifically, the open end 14 of the sewer pipe is positioned at the axis thereof. Concrete core cutter 2 on extension
When the bottom plate 20 is open at a height where the base plate 6 can be arranged, it is not necessary to dig down the bottom plate 20.

As shown in detail in FIGS. 5 to 7, a concrete core cutter 26 for cutting the manhole body 18 is connected to a ring-shaped member 28 and to the ring-shaped member so as to be circumferentially separable. Tubular cutter body 30
And

The concrete core cutter 26 includes a driving means 60 for rotating the concrete core cutter 26, a guiding means 70 for the concrete core cutter 26 and the driving means 60, and a guide means 70 for moving the concrete core cutter 26 along the guiding means 70. Exercise means 102 for exercise
In addition, a gap forming device for forming an annular gap 27 necessary for making the connection portion 24 flexible is provided.

The ring-shaped member 28 is connected to a driving means 60 for rotating the cutter body 30 around its axis.

The ring-shaped member 28 has a circular central opening 32.
And a flange portion 34 connected thereto. The flange portion 34 defines an outer peripheral edge of the ring-shaped member 28.

When the concrete core cutter 26 is used, the center opening 32 of the ring-shaped member is provided with a guiding means 70 described later.
Is passed through the guide rod 74 which will be described later. The central portion 33 defining the central opening 32 has a greater thickness than the flange portion 34, and there is a stepped portion formed of a cylindrical surface between the central portion 33 and the flange portion 34 (see FIG. 7).

On the other hand, the cutter body 30 is composed of a plurality of body parts 36 connected in a circumferential direction so as to be separable.

Each body portion 36 has an overall L-shaped cross section, and has one end 38 extending in the radial direction and the other end 39 extending in the axial direction. The other end 39 has a free end 42 (FIG. 6), on which a number of bits 40 are arranged at intervals in the circumferential direction. The bits 40 of the cutter body 30 exert a cutting action on the manhole body 18 when they are pressed against the inner wall surface defined by the manhole body 18 and given a rotational force.

One end 38 of each frame portion 36 partially overlaps the flange portion 34 of the ring-shaped member and abuts the step between the flange portion and the central portion 33 around the flange portion.

The frame portions 36 are circumferentially aligned with each other by contacting the step portions, and a plurality of bolts 46 are provided.
Is connected to the ring-shaped member 28 in a separable manner.
The bolt 46 is screwed into a screw hole 44 (FIG. 7) provided in the overlapping one end 38 and the ring-shaped member flange 34.

The two frame portions 36 adjacent to each other in the circumferential direction are connected to each other by bolts and bolts which are passed through bolt holes of a pair of brackets 48 provided on the surface of the one end portion 38.
The nuts 50 are connected so as to be separable.

The frame portions 36 are further fastened to each other by a band member 52 made of steel, for example, surrounding the periphery thereof. Both ends of the band-shaped member 52 are respectively
It is fixed to the other end by a pair of rivets (not shown) penetrating the other end 39 of the frame. The plurality of frame portions 36 can be separated and disassembled by removing the rivets and removing the belt-shaped member 52.

Each frame portion 36 has a concave groove 53 provided on the outer peripheral surface defined by the other end 39 and extending in the circumferential direction. The strip-shaped member 52 is disposed in the groove, so that the strip-shaped member 52 does not protrude on the outer peripheral surface of the body portion 36, and the concrete core cutter 26 is rotated around its axis to cut the manhole 16. So that it does not become an obstacle.

The interconnection between the adjacent frame portions 36 may be replaced with the fastening by the band-shaped member 52 or
At the same time, this can be performed using, for example, bolts 54 (FIG. 8).

The bolt 54 is fixed to the other end 39 of one of the frame portions 36 and the inner peripheral surface of the other end portion, and extends in the circumferential direction toward the other frame portion 36 and overlaps with the frame portion. It is screwed into a screw hole 58 provided in the member 56, whereby the two frame portions 36 are fastened to each other.

The bolt 54 has a length smaller than the thickness of the bit 40 (length in the diameter direction of the cutter body 30). Therefore, a part of the bolt 54 (the head of the bolt 54 in this example) does not protrude outward in the diametric direction from the bit 40, and does not hinder cutting.

Therefore, the concrete core cutter 2
6 can be disassembled into smaller ring-shaped members 28 and individual frame portions 36, each of which can be hung, for example by a crane, into the manhole 16 at the entrance thereof, and After loading, these can be assembled in the manhole 16.

As the bit 40, a diamond tip is preferably selected and used.

The plurality of bits 40 scattered along the free end of the cutter body 30 have an inner diameter slightly larger than the outer diameter of the sewer pipe 10. For this reason, the sewer pipe 40
An annular cutting mark having a width dimension corresponding to the thickness dimension of the bit 40 can be formed around the cutting edge.

In the illustrated example, the number of the frame portions 36 constituting the cutter frame 30 is four, but the number of the frame portions 36 takes into account the maximum size that the frame portion 36 can pass through the entrance of the manhole 16. Then, for example, it can be set to 2, 3 or 5 or more.

After carrying the concrete core cutter 26 into the manhole 16, the concrete core cutter 26
And a driving means for rotating the same, ie, a cutter driving device 60, are supported in the manhole 16 (see FIGS. 1 and 2).

The cutter driving device 60 includes a hydraulic device 62 such as a hydraulic motor, and the hydraulic device 62 is connected to a reduction gear mechanism 64.

The concrete core cutter 26 is connected to a reduction gear mechanism 64 via the ring-shaped member 28. The ring-shaped member 28 extends through a plurality of holes 65 provided in a central portion 33 of the ring-shaped member 28, and is connected to a large gear 66 (FIG. 7) of a reduction gear mechanism 64 via a plurality of bolts 68. It is fixed to.

The reduction gear mechanism 64 also has a hole 69 through which a later-described guide rod 74 can be inserted. The hole 69 has the same rectangular (for example, hexagonal) cross-sectional shape as the cross-sectional shape of the guide rod 74.

Preferably, the ring-shaped member 28 is separated from the concrete core cutter 26 and the reduction gear mechanism 64
To the body portion 36 of the cutter body.
Is attached to the ring-shaped member 28 and fixed with bolts 46 to assemble the concrete core cutter 26.

The cutter driving device 60 can be carried into the manhole through the entrance of the manhole 16 while being suspended by a crane, similarly to the frame portion 36 of the cutter frame.

The concrete core cutter 26 and the cutter driving device 60 have the guiding means 70
It is supported in the space above the bottom plate of the manhole 16 so that it can be guided along the extension of the axis of the sewer pipe 10.

The guiding means 70 is provided at the open end 14 of the sewer pipe.
And a guide rod 74. The guide means 70 can also be carried into and installed inside the manhole 16 through the entrance thereof while being suspended by a crane.

As shown in FIGS. 9 and 10, the centering device 72 includes an outer cylinder member 76 and an inner cylinder member 78 coaxially arranged inside the outer cylinder member.

The outer cylinder member 76 has an outer diameter slightly smaller than the inner diameter of the sewer pipe 10, and the inner cylinder member 78 is
It has an outer diameter smaller than 6.

The inner cylinder member 76 is connected to the outer cylinder member 76 at both ends by a pair of plate members 80.

The inner cylinder member 78 has a length greater than that of the outer cylinder member 76, one end of which projects from one end of the outer cylinder member 76 and extends into the manhole 16. Inner cylinder member 78
The one end of the central opening 82 has a square (eg, hexagonal) central opening 82.
Is provided with an end surface 83.

A pair of rod-shaped stopper members 84 are fixed to the one end of the inner cylinder member 78.

The two stopper members 84 extend from the outer peripheral surface at one end of the inner cylindrical member 78 to the opposite sides in the radial direction, and the ends (free ends) of the inner peripheral surface and the outer peripheral surface of the sewer pipe 10 are formed. Terminated between For this reason, the end of each stopper member 84 can abut on the end face of the sewer pipe 10.

Thus, the centering device 72 can be easily arranged in the sewer pipe 10 by inserting the centering device 72 into the open end 14 until the stopper members 84 contact the pipe end of the open end 14.

Further, when forming the gap 27 around the open end 14, each stopper member 84 does not hinder the axial movement of the concrete core cutter 26 and does not hinder the cutting of the manhole frame 18. The number of the stopper members 84 can be one or three or more instead of the illustrated example.

The centering device 72 includes a pair of spacer members 86 disposed along the lower surface of the outer cylinder member 76 and fixed to the outer cylinder member 76, and an outer cylinder member on the opposite side of the two spacer members 86. Outer cylinder member 76 formed on the outer peripheral surface of
Between the inner peripheral surface of the open end 14 of the sewer pipe
And two arc-shaped bevels 90 for receiving the same.

The spacer member 86 positions the outer cylindrical member 76 coaxially with the open end portion 14, and the wedge member 88 driven along the slope 90 between the open end portion 14 and the slope 90. The outer tube member 76 is fixed to the open end portion 14 by the frictional force generated in the outer cylinder member 76.

The number of the spacer members 86 and the slopes 90 can be at least one. In a single case, the spacer member 86 and the slope 90
Are arranged above and below the outer cylinder member 76, respectively. Further, the arrangement positions of the spacer member 86 and the slope 90 may be reversed from those in the illustrated example.

A guide rod 74 forming a part of the guide means 70
Has a square (e.g., hexagonal) cross-sectional shape that fits into and can be inserted into the square central opening 82 of the centering device 72.

The guide rod 74 is supported by the centering device 72 and the frame 18 defining the inner wall of the manhole 16. Guide rod 74 is concrete core cutter 2
6 through the central opening 32 and the hole 69 of the reduction gear mechanism (see FIG. 7), the concrete core cutter 26 and the cutter driving device 60 connected thereto are connected to the guide rod 7.
4 so as to be movable.

More specifically, the guide rod 74 is connected to the manhole 16 via one end 92 (FIG. 2) inserted into the center opening 82 of the centering device 72 and a pair of jacks 94 such as a hydraulic jack. It has a second end 96 in contact with the frame 18 defining the inner wall, and a flange 97 provided in the one end 92 and in contact with the end surface 83 of the inner cylinder member 78 of the centering device.

As the jack 94, a screw jack (not shown) can be used in place of the hydraulic jack.

Both jacks 94 are connected to the other end 9 of the guide rod.
6 and is fixed to a plate member 98 extending vertically. The piston rod of the jack 94 in the extending operation state penetrates the plate member 98 and contacts the plate member 100. The plate member 100 is in contact with the end of the other sewer pipe 12 and extends in the vertical direction.

The guide rod 74 has at one end thereof
It is received in the hexagonal central opening 82 of the centering device and, at its other end, is pressed against the inner wall of the manhole via a jack 94 which exerts a reaction force on the inner wall, so that it rotates about its axis. Not supported. Thus, when the cutter driving device 60 is operated, the guide rod 74 carries the rotational reaction force of the cutter driving device 60, and ensures the rotational movement of the concrete core cutter 26.

Instead of the illustrated example in which the inner wall of the manhole 16 is used as a reaction force support, the sewer pipe 12 itself can be used as a reaction force support. This includes, for example, sewer pipe 12
One or more jacks extending up and down are disposed in the inside and fixed to the inner wall of the sewer pipe 12, and a jack 94 is provided between the other end of the guide rod 74 and these jacks.
Alternatively, a plate member in contact with the open end surface of the sewer pipe 12 is arranged, and a jack 94 is arranged between the plate member and the guide rod 74.

When the concrete core cutter 26 cuts the skeleton 10, the concrete core cutter and the cutter driving device 60 are guided toward the sewer pipe 10 until the bit 40 of the concrete core cutter 26 contacts the inner wall of the manhole 16. This is done by moving along the axis of 74 and operating the cutter drive 60 to rotate the concrete core cutter 26 (see FIGS. 3 and 4). As a result, the open end 1 of the sewer pipe
A ring-shaped cutting trace is formed around the circumference of the bit 4 which is substantially equal to the width dimension of the bit 40.

Thereafter, the concrete core cutter 26 and the cutter driving device 60 are moved in opposite directions, and then the annular concrete piece 101 (see FIG. 20) remaining between the peripheral surface of the open end portion 14 and the cutting trace is removed. Resection. As a result, an annular gap 27 is formed in the trace of removal of the concrete piece.
Appears.

The filling of the gap 27 with the silicone is performed before filling the inside of the gap 27 with a filler such as a sponge. Thereby, the outflow of the silicone from the gap 27 into the ground can be prevented. After the silicone is filled, the gap 27 is closed with, for example, a sponge material or a rubber material.

The elastically deformable water-stopping material disposed in the annular gap 27 can be made of, for example, a ring-shaped or band-shaped rubber material instead of the silicone.

The movement of the concrete core cutter 26 and the cutter drive 60 along the guide rod is
This is performed by the exercise means 102.

The moving means 102 comprises a hydraulic device 104 such as a hydraulic jack disposed above and parallel to the guide rod 74.

In the illustrated example, the hydraulic device 104 is located in an elongated box 106.

The box 106 is fixed at one end thereof to the inner wall of the manhole 16 directly above the sewer pipe 10 and at the other end thereof through a hydraulic jack 108 which is in an extended operation state. It is pressed against the inner wall and is thereby supported by the frame 18 of the manhole 16. Instead of the hydraulic jack 108,
A screw jack (not shown) may be used.

The hydraulic jack 108 has a cylinder as a part thereof housed in and fixed to the box 106, and a piston rod extending from the cylinder is in contact with the inner wall of the manhole 16 via a block 109. The box 106 has a slit (not shown) extending in the axial direction on the bottom surface thereof.

The illustrated hydraulic device 104 includes a pair of hydraulic jacks 11 that are arranged in opposite directions and in two upper and lower stages.
0,112. The two hydraulic jacks are connected to each other in these cylinders and the upper hydraulic jack 110
Is located at the end of box 106 (sewer pipe 1
0 end). The piston rod of the lower hydraulic jack 112 is connected to the cutter driving device 60 via a connecting member 114 extending through the slit of the box 106.

The hydraulic jacks of the hydraulic device 104 are initially in an extended state. When the hydraulic jacks are contracted, the cylinders of the hydraulic jacks are moved toward the sewer pipe 10 into the box 10.
6 slides on the bottom and the connecting member 114 moves along the slit. As a result, the cutter driving device 60 and the concrete core cutter 26 move along the guide rod 74.

Reference numerals 116 and 118 indicate an inlet port and an outlet port of the hydraulic fluid in each hydraulic device. Further, the hydraulic jacks 110 and 112 may be arranged so that the cutter driving device 60 and the concrete core cutter 26 move along the rod 74 when they extend.

By the way, when the sewer pipe 10 is relatively short, when the annular gap 27 is formed around the sewer pipe 10, the sewer pipe 10 is inclined, and the sewer pipe 13 adjacent to the sewer pipe 13 (see FIGS. 11 and 13). There is a possibility that the connection with the server will be released.

In order to prevent this, FIGS. 11 and 12
As shown in (1), it is desirable to dispose pipe fixing jigs 120 in advance in the vicinity of these boundaries in both sewer pipes 10, 13.

The pipe fixing jig 120 is provided for the sewer pipes 10 and 13.
An upper plate member 124 and a lower plate member 126 on which are disposed two rods 122 having two circular cross-sections which contact the inner wall and extend in the axial direction, respectively.
4 and screw jack 12 on which lower plate member 126 is arranged
8 is included.

According to this, by rotating the screw rod 130 of the screw jack 128 around its axis, the upper plate member 124 is raised with respect to the lower plate member 126,
The rod 122 can be pressed against the inner wall of both sewer pipes 10,13. As a result, each rod 122 comes into line contact with the inner wall of both sewer pipes 10 and 13. As a result, the short sewage pipe 10 is fixed to the sewage pipe 13, and both sewage pipes can be kept straight, and the short sewage pipe 10 can be prevented from being inclined.

Since the height of the screw jack 128 can be arbitrarily changed in the vertical direction, the pipe fixing jig 1
20 can be applied to sewer pipes of various diameters.

Another example 131 of the pipe fixing jig is shown in FIGS.

This pipe fixing jig 131 is used for both sewer pipes 1
At least three plate members 132 contacting the inner walls of 0, 13
And spacer members 134, 136 connected to the respective plate members 132 and extending in the radial direction of the sewer pipes 10, 13, and two of these spacer members are detachably attached to the other spacer members 134 and the remaining spacer members 13
6 includes a tubular member 138 having an axis coinciding with the axis of the sewer pipes 10 and 13 penetrated through the hydraulic pipe 140, and a hydraulic jack 140 disposed in the tubular member and attached to the remaining spacer member 136.

The hydraulic jack 140 is a plate member 144 fixed to one end of the cylindrical member 138 and fixed to a plate member 142 extending in the vertical direction, and extends inside the cylindrical member 138 toward the other end. It is mounted and fixed on top and extends vertically. The plate member 144 is a cylindrical member 1
38 is supported by another plate member 146 extending upward from the lower portion. The plate member 14 is also provided at the other end of the cylindrical member 138.
A plate member 148 similar to 2 is fixed, whereby the cylindrical member 138 is reinforced.

According to the pipe fixing jig 131, when the hydraulic jack 140 is extended, one spacer member 1
The plate member 132 attached to 36 rises and presses the inner walls of both sewer pipes 10 and 13. As a result, the short sewer pipe 10 is fixed to the sewer pipe 13 with the three plate members 132, the two sewer pipes are maintained straight, and the short sewer pipe 10 can be prevented from being inclined.

Each of the spacer members 134 and 136 is replaced with another spacer having a different length, so that the pipe fixing jig 13 can be used.
1 can be applied to sewer pipes of various internal diameters.

As shown in FIGS. 11 and 13, it is desirable to seal the sewer pipe near the connection portion 24 before the concrete core cutter 26 is carried into the manhole.

In the illustrated example, the pipe fixing jigs 120, 131
The packer 150 is disposed at the back of the sewage system, and the sewer pipe 13 is sealed, whereby the inflow of sewage into the manhole 16 is stopped. When the sewer pipe 10 is relatively long, the packer 150 can be arranged in the sewer pipe.

Instead of supporting the concrete core cutter 26 and the cutter driving device 60 by the centering device 72 and the manhole frame 18 via the guide rod 74, these are replaced by the manhole bottom plate 20 via the guide device 152. On top of this, so that it can be arranged on an extension of the axis of the sewer pipe 10 (FIGS. 15 to 1).
8).

The guide device 152 includes a bed and a pair of guide rods 158 supported by the bed.

The bed has a pair of plate members 154 arranged on the dug down bottom plate 20 in the axial direction of the sewer pipe 10 at a distance from each other, and a pair of connection members for connecting the plate members 154 to each other. And a member 156. The two guide rods 158 are arranged above and in parallel with the two connecting members 156, and are fixed to the two plate-like members 154.

Spacers 160 and 162 are disposed between the two plate members 154 of the bed and the opposing wall surfaces of the manhole 16, respectively. The connecting member 156 of the bed has a pair of members extending in the longitudinal direction thereof. A hydraulic jack 164 is attached. Both jacks 164 are opposed to one spacer 160. The other spacer 16
2 is fixed to the bed.

By extending the hydraulic jack 164 and pressing the piston rod against one of the spacers 160, both spacers 160 and 162 are respectively pressed against the two wall surfaces of the manhole. Thereby, the bed is fixed to the frame 18 of the manhole. Instead of the hydraulic jack 164, a screw jack (not shown) can be used.

The concrete core cutter 26 and the cutter driving device 60 are supported by the two guide rods 158 via the plate member 166 so as to be movable along the guide rods. The plate member 166 is disposed so as to straddle the cutter driving device 60 and is fixed thereto.

The concrete core cutter 26 and the cutter driving device 60 are connected to the plate member 166 by the two guide rods 15.
A pair of multi-stage hydraulic jacks 1 for moving along 8
A hydraulic device consisting of 68 is supported.

More specifically, the cylinders of the hydraulic jacks 168 arranged on both sides of the cutter driving device 60 are fixed to the plate member 166, respectively, and the ends of these piston rods are fixed to the other spacer 162. .

Thus, when the two hydraulic jacks 168 are extended, the spacer 162 serves as a reaction force support.
Via the plate member 166, the concrete core cutter 26 together with the cutter driving device 60 is directed toward the sewer pipe 10,
It moves along the extension of the axis of the sewer pipe. Thus, the bit 40 of the concrete core cutter 26 can be pressed against the manhole frame 18, and during this time, the cutter driving device 60 is operated to rotate the concrete core cutter 26 to thereby rotate the open end 14 of the sewer pipe. An annular gap 27 can be formed around it (see FIGS. 17 and 18).

By arranging a camber 170 such as a wedge under each plate member 154, the inclination of the bed placed on the surface of the bottom plate 20 in an uneven state can be adjusted.

Further, when the concrete core cutter 26 and the cutter driving device 60 are supported on the bottom plate 20 of the manhole, the bottom plate is supported as compared with the case where the concrete core cutter 26 and the cutter driving device 60 are supported in the hollow inside the manhole 16 (examples shown in FIGS. 1 to 4). 20 more digs need to be done.

FIGS. 19 and 20 show the gap forming apparatus.
As shown in the figure, the bottom plate 20 of the manhole where this is installed
Can be rotatable with respect to.

The illustrated gap forming device includes a gap forming device similar to that shown in FIGS. 15 to 18 and a base 172 that rotatably supports the device on the bottom plate 20, and includes a concrete core cutter 26 and a drive therefor. A guide device 152 serving as a guide means of the device 60 is mounted on the base 172.

In this example, both spacers 160 and 162 are arranged between the base 172 and the inner wall surface of the manhole.
Further, both hydraulic jacks 168 are attached to the base 172, and the extension operation of both hydraulic jacks 168 allows
The base 172 is fixed to the skeleton 18 of the manhole.

The guide device 152 includes a shaft 174 (FIG. 21),
Flat plate member 176 fixed to the bottom surface of both plate members 154
And The shaft 174 extends downward from a substantially central portion of the flat plate member 176.

On the other hand, the base 172 has a pair of upper and lower flat plate members 178 facing each other and a pair of side plate members 180 fixed to these flat plate members and facing each other.

The flat plate member 176 of the guide device 152 is in contact with the upper flat plate member 178 of the base, and the shaft 174 extends downward through a hole 182 provided in the upper flat plate member 178 of the base. At the upper position.

From this, the guide device 152 is rotated around the axis 174 with respect to the base 172, whereby
The direction of the concrete core cutter 26 can be changed. The rotational movement of the guide device 152 can be generated, for example, by human power.

The rotated position of the concrete core cutter 26 whose orientation has been changed is determined by a stopper mechanism 183 described later.
Maintained by

A cylindrical member 184 forming a part of the stopper mechanism is attached to the base 172.

The cylindrical member 184 is arranged between the two flat plate members 178 and is fixed to the upper flat plate member 178. The cylindrical member 184 extends through a flange 186 provided on the cylindrical member 184 and is fixed via a bolt 188 screwed to the upper flat plate member 178.

The cylindrical member 184 is provided with the hole 184 of the upper plate member.
It has a larger inner diameter, is aligned with the hole 184, and
74 partially surrounds.

An outer ring 190 and an inner ring 192 fitted to the outer ring 190 are arranged between the cylindrical member 184 and the shaft 174.
94 is screwed, and the nut is in contact with the lower end of the cylindrical member 184.

The outer ring 190 and the inner ring 192 are
Each has an inner peripheral surface that defines a wedge surface that contacts each other and the peripheral surface. The outer ring 190 has an outer peripheral surface in contact with the inner peripheral surface of the cylindrical member 184, and the inner ring 192
4 has an inner peripheral surface in contact with the peripheral surface.

The outer ring 190 is held on the inner peripheral surface of the cylindrical member 184 via an O-ring 196 surrounding the outer ring 190. The nut 194 is rotatably attached to the lower end of the outer ring 190.

According to the stopper mechanism 183, the inner ring 192 can be lowered with respect to the outer ring 190 by rotating the nut 194 using a tool such as a wrench. Inner ring 1
The inner peripheral surface of 92 is pressed against the peripheral surface of shaft 174. As a result, the inner ring 192 is substantially fixed to the peripheral surface of the shaft 174, and the shaft 174 and the guide device 152 connected thereto can be kept from rotating.

[0130] The gap forming apparatus of this example is a manhole 16.
It is particularly advantageous to form gaps for flexibility in the plurality of sewer pipes connected to the manhole and extending in the radial direction with respect to the manhole, in the example shown, the sewer pipe 10 and the other sewer pipe 200.

In this case, the gap forming device is connected to its shaft 17
4 is installed at a position passing through the intersection of the axes of the two sewer pipes 10, 200. Thereby, after forming the annular gap about the sewer pipe 10, after rotating the said gap forming apparatus and directing this to the sewer pipe 200, and fixing the rotation position,
In the same manner as described above, the operation of forming the annular gap for the sewer pipe 200 can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a gap forming device including a concrete core cutter installed in a manhole and including a partial cross section.

FIG. 2 is a side view of the device shown in FIG.

FIG. 3 is a plan view of the gap forming device in a state where an annular gap is formed in a manhole body.

FIG. 4 is a side view of the device in the state shown in FIG. 3;

FIG. 5 is a perspective view of the concrete core cutter as viewed from one end thereof.

FIG. 6 is a perspective view of the concrete core cutter viewed from the other end side.

FIG. 7 is a longitudinal sectional view of a concrete core cutter connected to a cutter driving device.

FIG. 8 is a partial cross-sectional view showing a structure for connecting mutually adjacent frame portions of a cutter frame.

FIG. 9 is a longitudinal sectional view of a centering device disposed in a sewer pipe.

10 is a front view of the centering device shown in FIG.

FIG. 11 is a side view of a pipe fixing jig arranged in a sewer pipe.

FIG. 12 is a front view of the pipe fixing jig shown in FIG.

FIG. 13 is a side view of a pipe fixing jig according to another example disposed in a sewer pipe.

FIG. 14 is a front view of the pipe fixing jig shown in FIG.

FIG. 15 is a plan view of a gap forming apparatus according to another example including a partial cross section, having a concrete core cutter installed in a manhole.

16 is a side view of the gap forming device shown in FIG.

FIG. 17 is a plan view of the gap forming device in a state where an annular gap is formed in the body of the manhole.

18 is a side view of the device in the state shown in FIG.

FIG. 19 is a side view of a rotatable gap forming device including a partial cross section, which is installed in a manhole.

FIG. 20 is a plan view of the device shown in FIG. 19 in a state after a rotation operation.

21 is an enlarged sectional view of a stopper mechanism in the device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Sewer pipe 16, 18, 20 Manhole (concrete structure), its frame, and bottom plate 24 Connection part between sewer pipe and manhole 26 Concrete core cutter 28, 30 Ring-shaped member and cutter frame 36 Frame portion of cutter frame 40 Bit 52 Band member 54 Bolt 60 Cutter drive

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyonori Samukawa 3-27-6 Omori Nishi, Ota-ku, Tokyo Inside Nagano Oil Machine Co., Ltd. (72) Inventor Tatsumi 3-27-6 Omori Nishi, Ota-ku, Tokyo No. F-term in Nagano Yuki Co., Ltd. (reference) 2D047 BA27 3C069 AA04 BA09 BB01 BB03 CA08

Claims (7)

[Claims] 1. A method for perforating a wall of a concrete structure having an entrance, provided in the ground, wherein a concrete core cutter which can be disassembled into a plurality of pieces in a circumferential direction is disassembled inside the concrete structure. And drilling the wall of the concrete structure by the concrete core cutter assembled in the concrete structure. 2. A concrete core cutter provided in the ground for piercing a wall of a concrete structure having an entrance, and capable of being disassembled into a plurality of pieces in a circumferential direction thereof. 3. A ring-shaped member, and a cylindrical cutter body detachably connected to the ring-shaped member, wherein the cutter body comprises a plurality of body parts connected separably in a circumferential direction. A concrete core cutter, wherein each body portion has a number of bits located at its free end. 4. The concrete core cutter according to claim 3, wherein said ring-shaped member has a flange portion, and each frame portion has an end portion detachably connected to said flange portion. 5. The frame according to claim 3, wherein each of the frame portions has a groove extending in a circumferential direction on an outer peripheral surface thereof, and all the frame portions are connected by a band-shaped member arranged in the groove. Concrete core cutter. 6. The concrete core cutter according to claim 3, wherein adjacent skeleton portions are connected to each other by bolts, and a total length of the bolts is smaller than a thickness dimension of the bit in a radial direction of the cutter skeleton. 7. The concrete core cutter according to claim 3, wherein said bit comprises a diamond tip.