JP2000280232A - Cutting machine for inner surface of concrete pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting machine for the inner surface of a concrete pipe by which work forming a groove with prescribed width on the inner peripheral surface of the concrete pipe buried in the ground is easily performed in the case of performing work constructing a flexible part in the concrete pipe. SOLUTION: A guide frame 2 is freely rotatably supported between a pair of opposite supporting frames 1, 1' in which three pieces of supporting legs 6 are radially projected. A supporting frame 3 of the cutting machine is provided on the guide frame 2 through a guide means 24, A notching is performed in necessary depth by moving the guide means 24 in the radial direction of the concrete pipe. Then, a nick in the axial direction of the pipe is formed by moving the guide means 24 in the axial direction. Furthermore, the nick in the periferal direction is provided by rotating the guide frame 2. The inner face of concrete is released by inserting the tip of a bar into each nick and prizing it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pipe inner surface cutting machine for cutting a concrete pipe, such as a propulsion pipe, buried in the ground from its inner surface.

[0002]

2. Description of the Related Art In some cases, it is necessary to construct a flexible portion in a part of a concrete pipe buried in the ground in order to take measures against ground subsidence and earthquake. When performing this work, an operator must enter the inside of the concrete pipeline from the manhole and form a groove having a fixed width in the circumferential direction in the flexible portion construction portion.

[0003] In the conventional method for forming the above-mentioned groove, a worker who has entered the inside of a pipeline cuts a large number of cuts on the inner surface of the concrete pipeline with a hand-held cutting machine. In this method, concrete pieces are sequentially peeled off by inserting the tip of a bar into the cut and prying.

[0004]

However, the work of cutting with a hand-held cutting machine as described above is not only inefficient, but also extremely difficult to cut the ceiling surface of a concrete pipeline. There was a problem of work.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concrete pipe inner surface cutting machine capable of efficiently performing a cutting operation with less burden on an operator.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a concrete pipe which projects radially from a bearing member disposed at the center of the concrete pipe.
A pair of opposing support frames provided with book support legs, a guide frame whose both ends are rotatably supported by the bearing members of the support frames, and a cut attached to the guide frame via guide means. And a cutting machine attached to the cutting machine support frame. The guide frame is rotated around the center axis of the bearing member of the one support frame to perform circumferential cutting by the cutting machine. A transmission means for circumferential driving is provided, and a transmission means for driving in the pipe axis direction for performing cutting by moving the cutting machine support frame in the pipe axis direction to the guide means, and a radius for performing cutting by moving in the radial direction. A transmission means for directional drive is provided so that the cutting machine support frame is oriented such that the direction of the circular blade of the cutting machine is either the pipe axis direction or the circumferential direction, or both. It is obtained by become attached to the guide means so as to face alternatively configure either.

[0007] The guide means includes a screw shaft mounted on the guide frame in parallel with the length direction thereof.
A tube axial guide member slidably fitted in the guide frame in the longitudinal direction thereof, a nut screwed to the screw shaft integrally with the tube axial guide member, and the tube axial guide member. The cutting machine support frame is slidably fitted to the cutting direction guide member, and the transmission means for driving in the tube axis direction is provided at one end of the screw shaft. The transmission means for the radial driving can be provided in the cutting direction guide member.

A structure in which the pair of support frames, the guide frame, the cutting machine support frame and the cutting machine can be assembled and disassembled, and a structure in which one or a plurality of circular blades are selectively attached to the cutting machine. Can be taken.

[0009] The transmitting means for driving in the circumferential direction, in the pipe axis direction and in the radial direction of the cutting machine can be either human power or power.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a concrete pipe inner surface cutting machine according to an embodiment includes a pair of support frames 1,
1 ', a guide frame 2 rotatably supported between the support frames 1, 1', a cutting machine mounting frame 3 mounted on the guide frame 2, and a cutting machine 4 mounted on the cutting machine support frame 3 Consists of

Each of the support frames 1, 1 'has a bearing member 5, 5' at the center, and three support legs 6 are provided at equal positions around the bearing members 5, 5 '. It is provided radially in the radial direction of the concrete pipe 7 (see FIG. 3). Each support leg 6 has an intermediate leg 9 connected to the bearing members 5, 5 ′ by a pin 8, and a tip leg nested into the intermediate leg 9 and connected by a pin 11 at a length adjustment hole. And a screw jack 13 provided on the tip leg 12. However, if the supporting leg 6 having a length matching the pipe diameter is manufactured, the intermediate leg 9 and the distal leg 12 do not need to be nested, and can be integrally connected.

The bearing member 5 of the one support frame 1 described above.
A radial bearing 14 is provided at the center, and a shaft 2a at one end of the guide frame 2 is rotatably fitted and supported by the radial bearing 14.

The bearing member 5 'of the other support frame 1'
As shown in FIG. 5, a joint shaft 15 integral with the inner race of the radial bearing 14 ′ is provided on both sides thereof, and the other end of the guide frame 2 is attached to the end protruding toward the one bearing member 5. The shaft portion 2 b is inserted and detachably connected by a pin 16. The end of the joint shaft 15 protruding to the opposite side is connected to the output shaft of a worm reducer 17 provided integrally with the bearing member 5 '.

[0015] A hexagonal shaft 18 for driving in the circumferential direction is connected to the input shaft of the worm speed reducer 17 as transmission means for driving in the circumferential direction. Further, a stopper knob 19 for preventing rotation is provided adjacent to the hexagonal shaft 18 so as to be able to advance and retreat, and the tip of the stopper knob 19 is pressed against the hexagonal shaft 18 so as to be connected to the hexagonal shaft 18 and the hexagonal shaft 18. The rotation of each of the above members is prevented.

The above-described guide frame 2 comprises a square pipe portion 2
c, the shaft portions 2a and 2b are integrally provided at both ends thereof, and a longitudinal screw shaft 21 is arranged in parallel with the guide frame 2 on the upper surface of the square pipe portion 2c. Are rotatably supported by bearings 22 and 22 '. A tube axis driving hexagonal shaft 23 as a tube axial driving transmission means is coupled to an end of the screw shaft 21 protruding from the bearing 22 'on the support frame 1' side.

Further, the guide frame 2 is provided at a position lower than the screw shaft 21 with a required gap from the screw shaft 21 so as to have a rectangular cylindrical axial guide member 25 of the guide means 24.
Are slidably fitted in the axial direction (see FIGS. 1 and 6). A nut 26 is fixed to the upper surface of the axial guide member 25, and the screw shaft 21 is screwed to the nut 26.

A radial guide member 27 having a vertical hole is provided on one side surface of the axial guide member 25. The guide member 27 includes a gear box 28
The cutting machine support frame 3 consisting of a square shaft is vertically movably inserted. A worm speed reducer 29 is provided inside the gear box 28 (see FIG. 3), and a hexagonal shaft 31 for radial drive as a transmission means for radial drive is coupled to an input shaft of the gear box 28.

A rack 32 is provided on one side of the cutting machine support frame 3 in the vertical direction, and a pinion 33 meshing with the rack 32 is provided inside the cutting machine support frame 3 (see FIG. 3). The rotation shaft of the pinion 33 is connected to the output shaft of the worm speed reducer 29. The radial guide member 27 is provided with a stopper knob 34 for preventing movement in the radial direction. When the stopper knob 34 engages with the rack 32, the movement of the cutter 4 in the radial direction is prevented.

A screw shaft 35 is vertically movably inserted into the center of the cutting machine support frame 3, and the cutting machine 4 is attached to the lower end of the screw shaft 35 protruding from the lower end of the frame 3. That is, a mounting plate 36 is fixed to the upper surface of the cutting machine 4, a screw 36 a to which the screw shaft 35 is screwed is provided on the mounting plate 36, and a female screw 36 a
Is provided with a rectangular positioning recess 37 into which the lower end of the cutting machine support frame 3 is fitted. The above female screw 36a
The screw shaft 35 is firmly fixed to the mounting plate 36 by fastening a nut 40 to the lower end of the screw shaft 35 screwed into the mounting plate 36 from below. The upper end of the screw shaft 35 protrudes above the cutting machine support frame 3, and a nut 39 is screwed into the protruding portion to raise the screw shaft 35 so that the lower end of the cutting machine support frame 3 is positioned as described above. 37, and the cutting machine 4 is mounted on its supporting frame 3
To a non-rotatable state.

When the nut 39 is loosened and the cutter 4 is lowered with respect to the support frame 3 together with the screw shaft 35, the lower end of the support frame 3 is disengaged from the positioning recess 37. By rotating the circular blade 38 by 90 ° about the center 35, the direction of the circular blade 38 can be selectively set between a tube axis direction parallel to the guide frame 2 and a circumferential direction perpendicular to the tube axis direction.

The circular blade 38 is made of diamond or the like. Although one sheet is shown in the drawing, two sheets may be used as shown by a dashed line in FIG. 3, or two or more sheets may be used.

In addition, in the figure, 41 is an air hose for supplying pressurized air to the air motor of the cutting machine 4, and 42 is a water supply hose for supplying cooling water to the circular blade 38.

The concrete pipe inner surface cutting machine of the embodiment is as described above, and the operation method will be described next.

First, as a preparation before the operation, one support frame 1 is carried through a manhole to a predetermined position inside a concrete pipe 7 communicating with the manhole, and the center of the bearing member 5 of the support frame 1 is moved to the concrete pipe. The screw jack 13 at the end of each support leg 6 is fixed to the inner surface of the concrete pipe 7 by adjusting it so as to match the center of the pipe 7.

Next, the guide frame 2, the cutting machine support frame 3, and the cutting machine 4 are carried into a manhole (not shown).
In the manhole, the cutting machine support frame 3 is inserted into the guide means 24 of the guide frame 2, the pinion 33 is engaged with the rack 32, and the hexagonal shaft 31 for driving in the radial direction is rotated and inserted to the end to further prevent movement in the radial direction. By operating the stopper knob 34, the cutting machine 4 is fixed so as not to fall. Next, these assemblies are carried into the concrete pipe 7, and one end of the guide frame 2 is inserted into the bearing member 5.

Next, the other support frame 1 'is carried into the concrete pipe 7 through the manhole, the other end of the guide frame 2 is inserted into the bearing member 5', and each screw jack 13 is connected to the inner surface of the concrete pipe 7. Tentatively. Next, the hexagonal shaft 18 for circumferential driving is rotated so that the pin holes of the joint shaft 15 and the guide frame 2 are aligned, and the pin 16 is inserted. Then, while adjusting the center of the bearing member 5 ′ so as to coincide with the center of the concrete pipe 7, the screw jack 13 is fixed to the inner surface of the concrete pipe 7 by protruding.

Next, the air hose 41 and the water supply hose 42
Is connected to a predetermined position of the cutting machine 4 to complete the preparation (FIG. 2).
State).

After completing the above preparations, when cutting in the pipe axis direction, an operator in the concrete pipe 7 inserts the manual handle 43 into the hexagonal shaft 31 for radial driving,
Loosen the stopper knob 34 for preventing movement in the radial direction and operate the above-described manual handle 43 to remove the blade 38 from the concrete pipe 3.
7 close to the inner surface.

Here, the manual handle 43 is replaced with the hexagonal shaft 18 for driving in the circumferential direction, and the cutting machine 4 is mounted together with the guide frame 2.
And confirm that the circular blade 38 does not interfere with the inner surface of the tube. Further, an initial cutting position (a position in the circumferential direction) by the circular blade 38 is determined, and fixed by the rotation preventing stopper knob 19.

Next, the manual handle 43 is replaced with the above-mentioned hexagonal shaft 31 for driving in the radial direction, the stopper knob 34 for preventing movement in the radial direction is loosened, and the circular blade 38 is disengaged from the water supply hose 42.
And the circular blade 38 of the cutting machine 4 is rotated. When the manual handle 43 is operated, the cutting machine 4 descends,
As a result of the circular blade 38 cutting in the radial direction of the concrete pipe 7, the inner wall thereof is cut to a predetermined depth t inside the position of the outer reinforcing bar 45 (see FIG. 7A). When the cutting is completed, the cutter support frame 3 is fixed by the sputter knob 34 in order to fix the circular blade 38 at the position of the depth.

Next, the manual handle 43 is replaced with a hexagonal shaft 23 for driving in the pipe axis direction, and the cutting machine 4 is moved in the pipe axis direction of the concrete pipe 7 while being driven to cut the cut A1 in the pipe axis direction ( FIG. 7A).

When the cutting of the cut A1 is completed, the cutting machine 4
The manual handle 43 is rotated in the reverse direction while the
1 and return to the original position or lift one end to cut A
Move away from 1 and return to the original position. In the original position, the stopper knob 34 is loosened, and the manual handle 43 is replaced with the hexagonal shaft 31 for driving in the radial direction.
Is raised from the cut A1, and the stopper knob 34 is fixed.

Next, the stopper knob 19 (see FIG. 2) for preventing rotation is loosened, the manual handle 43 is replaced with the hexagonal shaft 18 for driving in the circumferential direction, and the cutting machine 4 is rotated in the circumferential direction, and the next cutting position is set. Move to Then, the cut A1
The next cut A2 is cut by the same operation as described above.

In the same manner, the following cuts A3 to An
Cutting is performed at regular intervals over the entire circumference.

After the cuts A1 to An are formed, the nut 39 on the cutting machine support frame 3 is loosened and the cutting machine 4 is slightly lowered to separate the angular axis of the cutting machine support frame 3 from the positioning recess 37. Let it. When the nut 39 is tightened after rotating the cutting machine 4 by 90 °, the square axis of the cutting machine support frame 3 is fitted into the positioning recess 37 again. Thereby, the direction of the circular blade 38 is oriented in the circumferential direction.

Thereafter, as described above, the manual handle 43 is inserted into the hexagonal shaft 31 for driving in the radial direction, the stopper knob 34 is loosened, and the manual handle 43 is operated to operate the blade 3.
8 is brought closer to the inner surface of the concrete pipe 7. Here, by changing the operation of the manual handle 43 to the hexagonal shaft 18 for driving in the circumferential direction, the cutter 4 is rotated together with the guide frame 2, and it is confirmed that the circular blade 38 does not interfere with the inner surface of the pipe. Further, the first cutting position (position in the pipe axis direction) by the circular blade 38 is determined and fixed by the stopper knob 19.

Next, the manual handle 43 is replaced with the above-described hexagonal shaft 31 for radial driving, the stopper knob 34 is loosened, water is supplied from the water supply hose 42 to the circular blade 38, and the cutting machine 4 is driven. When the manual handle 43 is operated, the circular blade 38 moves in the radial direction as the cutting machine 4 moves down, and cuts the inner wall of the concrete pipe 7 by a predetermined depth t to the inner position of the outer-side rebar. When the cutting is completed, the cutting machine mounting frame 3 is set by the stopper knob 34.
Is fixed in that position.

Next, the manual handle 43 is replaced with the hexagonal shaft 18 for driving in the circumferential direction, the stopper knob 19 is loosened, and the manual handle 43 is operated to cut the concrete pipe 7 in the circumferential direction. Disconnect. Thereafter, when cutting is performed up to the cut Bn in the same manner, a grid-shaped cut is formed on the inner peripheral surface of the concrete pipe 7.
(See (a)). These cuts A1 to An, B1 to Bn
When the tip of the crowbar is inserted and pryed, the concrete piece is peeled off together with the cut piece of the reinforcing bar 45, and a groove 46 having a constant width is formed in the circumferential direction (see FIG. 8).

The cuts B1 to Bn in the circumferential direction have a larger cutting resistance than the cuts A1 to An in the pipe axis direction, and therefore may be provided at a coarse pitch. When the number of the blades 38 of the cutting machine 4 is plural, plural cuts are formed at a time.

The cuts provided on the inner surface of the concrete pipe 7 do not necessarily have to be the cross cuts as described above, but only the cuts A1 to An in the pipe axis direction or only the cuts B1 to Bn in the circumferential direction. However, the force applied to the crowbar increases, but peeling is possible.

The above is described on the inner surface of the concrete pipe 7.
The case where the concave groove 46 is formed over the entire circumference has been described. However, when a concave portion is formed in a part of the inner surface, it is only necessary to partially form the cut in the tube axis direction and the cut in the circumferential direction. . In some cases, each cut may be formed at a depth T that reaches from the inner surface to the outer surface of the concrete pipe 7.

In the above embodiment, the driving source for driving the cutting machine 4 in the circumferential direction, the tube axis direction, and the radial direction is manually driven. However, the hexagonal shaft 18 for driving in the circumferential direction and the hexagonal shaft 23 for moving in the tube axis direction are used. Further, a power source such as an air motor may be attached to the portion of the hexagonal shaft 31 for driving in the radial direction, and the power source may be remotely controlled to drive each axis.

[0044]

As described above, according to the present invention, the cutting machine mounted via the support frame, the guide frame and the cutting machine support frame is cut on the inner surface of the concrete tube while moving the inner surface of the concrete pipe manually or remotely. Is automatically formed, and the working labor for forming the concave groove in the concrete pipe can be greatly reduced, and the working efficiency can be improved.

In addition, since the above-mentioned components are configured to be disassembled and disassembled, it is easy to carry in and out of the concrete pipe and can be used inside a concrete pipe having a relatively small diameter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a cross-sectional view of the usage state of the above.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a cross-sectional view in another use state of the above.

FIG. 5 is a partially enlarged sectional view of the above.

FIG. 6 is a partial perspective exploded view of the embodiment.

7A is a perspective sectional view of a concrete pipe, and FIG. 7B is a partially enlarged sectional view of FIG.

FIG. 8 is a partial sectional view of a concrete pipe.

[Explanation of symbols]

 1, 1 'support frame 2 guide frame 2a. 2b Shaft part 2c Square pipe part 3 Cutting machine mounting frame 4 Cutting machine 5, 5 'Bearing member 6 Support leg 7 Concrete pipe 8 Pin 9 Middle leg 11 Pin 12 Tip leg 13 Screw jack 14, 14' Radial bearing 15 Joint Shaft 16 Pin 17 Worm reducer 18 Hexagonal shaft for circumferential driving 19 Stopper knob 21 for preventing rotation 21 Screw shaft 22, 22 'Bearing 23 Hexagonal shaft for driving in tube axis direction 24 Guide means 25 Tube axis direction guide member 26 Nut 27 Radial direction Guide member 28 Gear box 29 Worm reducer 31 Hex shaft for radial drive 32 Rack 33 Pinion 34 Stopper knob for preventing radial movement 35 Screw shaft 36 Mounting plate 37 Positioning recess 38 Circular blade 39 Nut 40 Nut 41 Air hose 42 Water supply hose 43 Handwheel 45 Reinforcing bar 4 6 groove

 ──────────────────────────────────────────────────の Continued on the front page (71) Applicant 593110580 Shibuya Co., Ltd. 2-5-16 Honkawacho, Naka-ku, Hiroshima-shi, Hiroshima Prefecture Kogyo Co., Ltd. (72) Inventor Yoshitaka Aizawa 2400 Matsuzaki, Osa, Usa City, Oita Prefecture Inside Kyushu Hume Co., Ltd. (72) Inventor Mitsuaki Tanimoto 8-8-26, Nishi-ku, Hiroshima City Commerce and Industry Center Shibuya Works F-term (reference) 3C069 AA01 BA04 BC02 CA08 EA01

Claims (5)

[Claims] 1. A pair of opposing support frames provided with three support legs protruding in the radial direction of a concrete pipe from a bearing member disposed at the center of the concrete pipe, and the bearing members of the respective support frames. A guide frame having both ends rotatably supported, a cutting machine support frame attached to the guide frame via guide means, and a cutting machine attached to the cutting machine support frame; The bearing member of the frame is provided with a transmitting means for rotating the guide frame around its central axis to perform circumferential cutting by the cutting machine, and the guide means is provided with the cutting machine support frame in the pipe axis direction. The cutting machine is provided with a transmission means for moving in the axial direction of the tube for moving and cutting, and a transmission means for driving in the radial direction for moving and cutting in the radial direction. Concrete comprising a support frame attached to the guide means such that the direction of the circular blade of the cutting machine is oriented in one of the tube axis direction and the circumferential direction, or alternatively oriented in one of the two directions. Pipe inner surface cutting machine. 2. A screw shaft mounted on the guide frame in parallel with the length direction of the guide frame, and a guide member in a tube axis direction slidably fitted in the guide frame in the length direction. And a nut screwed to the screw shaft integrally with the tube axis guide member, and a cutting direction guide member integrated with the tube axis direction guide member,
The cutting machine support frame is slidably fitted to the cutting direction guide member, the transmission means for driving in the tube axis direction is provided at one end of the screw shaft, and the transmission means for driving in the radial direction is provided. 2. The concrete pipe inner surface cutting machine according to claim 1, wherein the cutting pipe is provided on the cutting direction guide member. 3. The concrete pipe inner surface cutting machine according to claim 1, wherein the pair of support frames, guide frames, cutting machine support frames, and the cutting machine can be assembled and disassembled. 4. The concrete pipe inner surface cutting machine according to claim 1, wherein one or more circular blades are selectively attached to said cutting machine. 5. The concrete pipe according to claim 1, wherein the transmission means for driving in the circumferential direction, the pipe axis direction, and the radial direction of the cutting machine is one of human power and power, respectively. Surface cutting machine.