JPH078159Y2 - Opening device for inner tube lining tube - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for opening a branch opening of a branch pipe blocked by the lining when repairing the inner surface of the main pipe of the underground buried pipe with a flexible tube. Regarding the device.

[0002]

2. Description of the Related Art Underground pipes such as sewers and waterworks have long-term use, resulting in misalignment and cracks in pipe joints, corrosion of metal pipes, etc. Problems such as ground depression and water loss due to water leakage outside the pipe, poor distribution due to intrusion of tree roots, and generation of red water due to the above corrosion will occur. To deal with this, it is desirable to replace the buried pipe with a new pipe, but due to road conditions and surrounding conditions such as complicated underground buried and overground structures, the excavation work of the ground itself has become extremely difficult in recent years. It becomes difficult and the construction cost is enormous.

Therefore, a method for repairing an existing pipe without lining replacement by developing a flexible tube on the inner surface of the existing pipe which is still buried in the ground, a so-called rehabilitation method, has been developed and implemented. ing. This rehabilitation method removes deposits, deposits, tree roots, etc. to clean the inside of the pipe, and then draws in a flexible tube made of a composite film of synthetic resin into the pipe, and air or water inside it. It is introduced and expanded, and heated by steam, hot water, or the like, or adhered to the inner surface of the tube and fixed without being heated. However, in such a recycling method, when the branch pipe is connected to the main pipe, the branch opening of the branch pipe is closed by the flexible tube, so that part needs to be opened.

Conventionally, as a device for opening the branch opening after the tube lining as described above, a remote-controllable traveling body equipped with a heating iron is inserted into a main pipe lined with a flexible tube. It is known that, while checking with a television camera, the cable is pulled to a position of a branch pipe via a cable and a heating iron is rushed into a tube whose branch opening is closed to melt and break. However, it is difficult to apply such an opening device using a heating means when the tube is made of a material that is difficult to melt or when the diameter of the branch opening is large, such as in a branch pipe of a sewer main (about 150 mm in diameter). In addition, there is a problem in that the tube region attached to the inner surface of the main pipe in the periphery is melted or thermally deteriorated by heat.

In order to solve the above problem, the inventors of the present invention have previously proposed a hole opening device in which the lining tube of the branch opening is broken by jetting high-pressure water. As shown in FIG. 10, this perforation apparatus mounts a swing head 102 on a traveling body 101 capable of traveling in the main pipe A so as to be swingable around an axis line along the traveling direction, and
01 to the oscillating head 102 are provided on both left and right traveling guide rods, and the oscillating head 102 is provided with the oscillating nozzle head 105 which horizontally oscillates at a low speed by using the air motor 104 as a driving source. The air rotary actuator 10 as a drive source of the swing drive shaft 106 for the swing head 102.
7 and brake air cylinder 1 for rocking head 102
08, after stopping the traveling body 101 at a predetermined position in the main pipe A, the air rotary actuator 1
At 07, the swing head 102 is rotated about the axis, and when the swirling nozzle head 105 is positioned substantially coaxial with the center of the branch opening C, the air cylinder 108 presses the brake disc 109 on the air rotary actuator 107 side. The swirl nozzle 105 is horizontally swung at a low speed while the swing head 102 is fixed at a fixed swing position, and high pressure water is supplied to the nozzle 10 of the swirl nozzle head 105.
5a and 105a are jetted out, and the jetting force cuts the lining tube P of the branch opening C into a circular shape. This is not affected by the material of the tube P unlike the one using a heating iron, and is efficient,
This has the advantage that the tube P can be sharply cut into a circular shape.

[0006]

However, in the opening device according to the above-mentioned proposal, the traveling guide rod 103 for guiding the traveling body 101 in the main pipe A is provided with the traveling body 1 described above.
01 extends to the side of the rocking head 102 located on the rear side in the traveling direction, and also has a supporting function for the rocking head 102 that receives a reaction force when the high-pressure water is ejected, so the travel guide rod 103 As a result, it is relatively long and large. For this reason, it is difficult to reduce the size of the entire apparatus, and it is troublesome to devise a position and a mounting structure that do not hinder the swing displacement of the swing head 102. Further, as a method of stopping the swing head 102 at the swing fixed position, a configuration is adopted in which the brake disc 109 on the air rotary actuator 107 side is pressed by the air cylinder 108 to brake.
Since the response during braking is poor, it is difficult to set the swing head 102 at the swing fixed position with high accuracy.

The present invention has been made in order to solve the above-mentioned problems of the prior art. Not only can the lining tube be sharply cut in a short time, but it can easily be made compact, and the rocking head can be rocked. An object of the present invention is to provide a device for opening a pipe inner surface lining tube that can be accurately positioned at a fixed position.

[0008]

In order to achieve the above object, the opening device for a tube inner surface lining tube according to claim 1 of the present invention is closed by lining a flexible tube on the inner surface of the main tube. A device for opening a branch opening of a branched pipe, wherein the device is capable of traveling in the longitudinal direction of the main pipe by a traction means or a self-propelled means, and a swing drive shaft supported by the traveling body is used. The oscillating head is connected to the rear side of the moving body so as to be able to oscillate around an axis line along the traveling direction, and an air motor and a worm speed reduction mechanism for transmitting the rotational force of the air motor to the oscillating drive shaft are mounted. Further, traveling guide rods that do not extend to the swing head side are attached to the left and right sides of the traveling body, while the swinging head is provided with a swing axis orthogonal to the traveling direction of the traveling body. The swirling nozzle head and the rotary drive shaft that is rotated by the high-pressure air supplied from the air supply port are held, and the high-pressure water supplied from the high-pressure water supply port is provided at the end of the swirling nozzle head. A high-pressure water passage leading to the swirl nozzle, a deceleration mechanism for decelerating the rotation of the rotary drive shaft and transmitting the decelerated rotation to the swivel shaft of the swirl nozzle head, and a central position in the width direction, which is held on the side opposite to the swirl nozzle mounting side. With a ball caster supported on the inner surface of the main pipe,
The flexible tube at the branch opening is cut into a circular shape by the high pressure water jetted from the jet port of the swirling nozzle head that swirls at a low speed.

According to the second aspect of the present invention, the traveling body is provided with a cylinder for fixing the traveling body by pressing the inner surface of the main pipe at a predetermined stop position of the traveling body.

[0010]

According to the present invention, since the swirling nozzle head is swung by the air pressure, the hydraulic energy of the high pressure water is not consumed for the swirling, and the nozzle head is provided through the speed reducing mechanism. Since it turns at a low speed, the degree of concentration of water pressure energy per unit length and unit time at the annular cutting line of the Raininig tube is large, and it is not scattered by centrifugal force, and due to the extremely high concentration of water pressure in a minute area, The tube is cut into a circular shape with a sharp cutting line that is completely cut as if it was a gas fusing, and is slowly arcuate to form a branch opening. Further, since the swing head can swing around the axis line along the traveling direction of the traveling body, the orientation of the swirling nozzle head can be freely set according to the circumferential connection position of the branch pipe with respect to the main pipe.

Particularly, since the traveling body is supported by the traveling guide rod which does not extend to the swinging head, while the swinging head is supported by the ball casters, it is possible to make the compact by using the short traveling guide rod. You can easily select and set the mounting device. Further, since the worm speed reduction mechanism is interposed between the swing drive shaft to which the swing head is connected and the air motor, the swing head can be instantly moved to the fixed swing position by stopping the drive of the air motor. It can be fixed, and the direction of the swirling axis of the swirling nozzle head can be easily and accurately set at the center of the branch opening during the opening operation.

According to the second aspect, when the cylinder is operated at a predetermined stop position of the traveling body, the inner surface of the main pipe is pressed by the cylinder and the traveling body is fixed by the reaction force thereof. It is also possible to prevent a situation in which the running body inadvertently shifts in the front-rear direction due to such factors.

[0013]

1 to 5 show an opening device 10 for opening a branch opening C of a branch pipe B which is closed by a flexible tube P lined on the inner surface of a main sewer A. 11
Is a running body that can run in the main pipe A, 12 is a swing head connected to the rear side of the running body 11, and 13 is the swing head 12
It is a swirling nozzle head held by.

The traveling body 11 has a length substantially corresponding to the entire length in the front-rear direction (traveling direction) of the traveling body 11 and does not extend to the oscillating head 12 side. Rods 14 and 14 are provided on both sides in the width direction (left-right direction).
A mounting base 11a is laid between the two, and on this base 11a,
As shown in FIG. 5, a swing drive shaft 15 having a swing head 12 fixed to the rear end thereof along the front-rear direction is rotatably held via bearings 15a, 15a, and stands at the front end of the base 14. An air motor 16 for reversibly rotating the swing drive shaft 15 within a range of 120 degrees (see FIG. 4) via a mounting plate 11b provided, and a rotational force of the air motor 16 housed in a gear box 17. And a worm speed reduction mechanism 18 for decelerating and transmitting the speed to the oscillating rotary shaft 15.

As shown in FIGS. 5 and 6, the worm speed reduction mechanism 18 includes a rotary shaft 16 of the air motor 16.
a driving shaft 18b connected to a through a coupling 18a in the front-rear direction, a worm 18c fixed to the driving shaft 18b, an intermediate shaft 18d arranged in the width direction, and the worm described above. Worm wheel 18 that meshes with 18c to form the first stage worm reduction mechanism
e, a worm 18f fixed to the intermediate shaft 18d, and a worm wheel 18g fixed to the swing drive shaft 15 and meshing with the worm 18f to form a second stage worm reduction mechanism. Note that FIG.
Inside, 18h, 18h are bearings of the driving shaft 18b, FIG.
Inside, 18i, 18i are bearings of the intermediate shaft 18d. The worm speed reduction mechanism 18 decelerates the rotational force of the air motor 16 by two stages and transmits the rotational force to the swing drive shaft 15 in such a manner that it makes one revolution in 5 minutes, for example. In addition, the rocking displacement of the rocking head 12 is stopped via the rocking drive shaft 15, and the rocking head 12 does not rock by the external load from the rocking head 12 side due to the locking action of the worm gear mechanism.

On the other hand, in FIGS. 5 and 7-8,
The swing head 12 includes a swivel shaft 19 along the up-down direction of the swirl nozzle head 13, an intermediate shaft 20 along the left-right direction, and a rotary drive shaft 21 along the front-rear direction, which are a pair of bearings 22a, 22a, 22b, 22b, respectively. It is rotatably held via 22c and 22c. Then, the turning axis 19
The worm wheel 23a fixed to the intermediate shaft 20 meshes with the worm 24a fixed to the intermediate shaft 20, and the worm wheel 23b fixed to the intermediate shaft 20 meshes with the worm 24b fixed to the rotary drive shaft 21. ,
The rotation of the rotary drive shaft 21 is decelerated and transmitted to the intermediate shaft 20, and the decelerated rotation of the intermediate shaft 20 is further decelerated and transmitted to the turning shaft 19.

A cylindrical case 12a is provided at the rear of the swing head 12, and a vane type air motor 25 is provided in the middle of the cylindrical case 12a (see FIGS. 1 and 2). The shaft 25a is the cylindrical case 12
It is inserted and disposed in a and is coaxially connected to the rotary drive shaft 21 via a coupling 21a (see FIG. 8). 25b is a silencer provided on the exhaust side of the air motor 25. Then, the cylindrical case 12
At the tip of a, an air inlet 26 is opened as shown in FIG. 4, and an air hose 27 is connected to this inlet 26 as shown by the alternate long and short dash line in FIG. , The air motor 25 operates and the rotary shaft 2
5a and the rotary drive shaft 21 integrally rotate, and accordingly, the swivel shaft 19 is decelerated by two stages through the intermediate shaft 20 to rotate, and the swirl nozzle head 13 swirls at a low speed integrally with this. It should be noted that the turning speed is usually set to one rotation in 4 to 5 minutes.

The swirling nozzle head 13 is in the shape of a square rod, and as shown in FIG.
Nozzle members 28, 28 are respectively fastened and fixed by 8a, and each nozzle member 28 is formed with an ejection hole 28c extending along the swivel shaft 19 at the tip of a lead-out path 28b extending along the axial direction thereof. ing. In addition, since the nozzle member 28 is mounted along the longitudinal direction of the swirling nozzle head 13, it becomes easy to cope with a reduction in the diameter of the main pipe A. The swirl nozzle head 13 has a swivel shaft 19 at the center.
The nut 29 is screwed and fastened to the bolt portion 19a at the upper end thereof with a flat washer 29a or the like, so that the nut 29 is connected to the swivel shaft 19 so as to rotate integrally. The swivel shaft 19 is hollow and has a high-pressure water passage 30a inside, and the passage 30a has a through hole 30 at the upper end.
The annular flow passage 30c formed between the swirl nozzle head 13 and the swivel shaft 19 is communicated via b.
c is a conduction path 30 along the longitudinal direction of the swirling nozzle head 13.
It communicates with the injection port 28c of each nozzle member 28 via d, 30d and outlet paths 28b, 28b. Incidentally, 31 is an O-ring for liquid-tightly sealing the upper and lower portions of the annular flow channel 30c, 32
Is an oil seal interposed between the upper and lower parts of the rotary shaft 19 and the swing head 12.

Therefore, the high-pressure water passage 30a of the swivel shaft 19
A universal joint type hose connecting member 33, which can be omitted, is connected to the inlet port 30e at the lower end of the connecting port 33e as shown by the alternate long and short dash line in FIG. High pressure water hose 3 as shown by the dashed line
By connecting 4, the high pressure water introduced from the hose 34 is connected member 31 → inlet port 30e → high pressure water passage 30a → through hole 30b → annular flow passage 30c → conducting passage 30d →
It is ejected in a thin line shape from the ejection port 28c of each nozzle member 28 through the outlet passage 28b. This ejection pressure is usually 600 kg /
It is set to about cm ² .

Further, as shown in FIGS. 1, 4, 7, and 8, the side surface of the swing head 12 opposite to the side surface on which the swirling nozzle head is mounted, that is, the lower side surface of the swing head 12, has a central portion in the width direction. Positioned, one ball caster 35 is attached so as to project through the holder 36,
The ball caster 35 is in contact with the inner surface of the main pipe A to support the swing head 12.

On the other hand, as shown in FIGS. 1 to 3 and 5, the traveling body 11 has a cylinder 37 for fixing the traveling body.
Is installed upward, and its piston rod 37a
A pressing member 37b is fixed to the. When the traveling body 11 is stopped at a predetermined position, the cylinder 37 is extended to press the inner surface of the main pipe A with the pressing member 37b, and the traveling guide rods 14 and 14 which receive the reaction force from the traveling body 11
Is fixed in the main pipe A in a stretched state. In the figure, 38 is a silencer provided on the exhaust side of the air motor 16.

The air motor 16 and the air hose (not shown) of the cylinder 37, the air motor 2
The air hose 27 and the high-pressure water hose 34 of No. 5 are combined into a single cable 39 as shown by the alternate long and short dash line in FIG. 1 and FIG. 2, and are connected to the high-pressure air and high-pressure water supply source S (FIG. 9) at the end. To be done. Reference numeral 40 denotes an eye nut fixed to the front end of the traveling body 11 and connected to the pulling wire L.

In order to open the lining tube of the existing sewer pipe using the opening device 10 having the above structure, as shown in FIG. 9, the traveling body 11 is moved from _one manhole M ₁ to the main sewer pipe A of the sewer pipe. Then, the towing wire L inserted into the main pipe A from the other manhole M ₂ is connected to the rear end of the traveling body 1. Then, while the wire L is pulled by the winch to move the traveling body 11, the position of the branch opening C of the branch pipe B is detected by a TV camera installed on the traveling body 11 or an appropriate sensor (not shown), and the traveling is performed. The body 11 is stopped at the required position. The traveling body 11 travels stably because the left and right traveling guide rods 14, 14 slide and guide the inner surface of the main pipe A during traveling, and the swinging head 12 is supported by the ball carrier 35 through the ball carrier 35. Slide on the inner surface of tube A. Since the guide rods 14 and 14 are relatively short and do not extend to the swing head 12 side, it is easy to respond to downsizing of the entire apparatus and there is no fear of disturbing the swing of the swing head 12. Therefore, there is no need to be bothered to select the mounting device.

When the traveling body 11 is stopped at a predetermined position, the cylinder 37 is operated to move the pressing member 37a to the position shown in FIG.
When it is pressed against the inner surface of the main pipe A as indicated by the chain line, the traveling body 11 is fixed by being stretched to the inner surface of the main pipe A by the traveling guide rods 14, 14 which receive the reaction force. Therefore, it is possible to eliminate the possibility that the traveling body 11 or the like is displaced back and forth due to the high-pressure water jetting force. As a matter of course, the one cylinder 37 is not limited to the above-described one, but the inner surface of the main pipe A may be stretched by using, for example, a pair of cylinders which are opposite to each other in the width direction.

Next, in the normal case where the branch opening C is located directly above, the initial swirling nozzle head 13 is in the upward posture, and when the branch opening C is not directly above, the air motor 16 is used. The oscillating drive shaft 15 is actuated to decelerate the oscillating drive shaft 15 through the worm speed reducing mechanism 18 to oscillate the oscillating head 12 at a low speed around any axis along the traveling direction. When the oscillating head 12 oscillates to a position where the oscillating shaft 19 of the oscillating nozzle head 13 opposes the center of the branch opening C substantially coaxially, the operation of the air motor 16 is stopped. At this time, the oscillating head 12 stops in response to the operation stop timing of the air motor 16 due to the interposition of the worm speed reduction mechanism 18, and is accurately positioned and held.

After the position is set in this way, the air motor 25 is driven to swirl the swirling nozzle head 13 at a low speed and high-pressure water is introduced from the high-pressure water hose 34. The high-pressure water ejected in a thin line form from 28c sharply cuts the lined nozzle P in the branch opening C into two arcs as the swirl nozzle head 13 swivels, and finally cuts both arcs. The lines are connected and cut into a circle, so that the branch opening C is opened. Since the reaction force generated when the high-pressure water is jetted from the swirling nozzle head 13 is received by the inner surface of the main pipe A via the ball caster 35, the swinging head 12 is held in an appropriate posture and the cutting point is cut. Misalignment is reliably prevented.

The swirl nozzle heads 13 having different lengths can be attached / detached and replaced to correspond to the branch openings C having different diameters. Further, in the embodiment, the traveling body is towed by the winch, but the traveling body 1
Alternatively, wheels may be attached to the motor 1 so that the motor 1 can be driven by a motor.

[0028]

According to the opening device of claim 1, when the branch opening of the branch pipe closed by lining the inner surface of the main pipe with the flexible tube is cut off with high pressure water to open the hole. There is no hydraulic energy loss due to the swiveling of the swirling nozzle head, and the degree of concentration of the hydraulic energy to the cut portion of the linenig tube is large due to the low speed swiveling of the nozzle head, and there is no scattering due to centrifugal force, and there is a small area. Since extremely high water pressure is concentrated on the tube, the tube can be efficiently cut into a circle with a sharp cut such as gas fusing in a short time without being affected by the material of the tube. Since the direction of the swivel axis is variable in the circumferential direction of the main pipe, even if the circumferential connection position of the branch pipe with respect to the main pipe is different, the opening work can be performed without support. Especially, since only the traveling body is supported by the traveling guide rod and the swinging head is supported by the ball caster, it is possible to make the traveling guide rod shorter to make the overall compact, in other words, to reduce the diameter of the main pipe. Further, since the rotational force of the air motor is decelerated and transmitted to the swing drive shaft via the worm speed reduction mechanism, the swing head can be positioned at the swing fixed position with high accuracy. Even if an external load such as a reaction force when the high-pressure water is jetted is applied to the swing head by the locking action peculiar to the worm speed reduction mechanism, the positioning state does not change.

According to the second aspect of the invention, the traveling body is pressed against the inner surface of the cylinder main body at a predetermined traveling stop position and the traveling body is fixed by the reaction force thereof, so that the traveling body is prevented from unintentionally moving back and forth. Can be stopped.

[Brief description of drawings]

FIG. 1 is a side view showing an opening device according to an embodiment of the present invention.

FIG. 2 is a plan view of the opening device.

FIG. 3 is a front view of the opening device.

FIG. 4 is a rear view of the same opening device.

FIG. 5 is a plan sectional view showing an internal mechanism of the same opening device.

6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

8 is a cross-sectional arrow view taken along line 8-8 of FIG.

FIG. 9 is a schematic explanatory view for explaining a hole opening operation by the hole opening device.

FIG. 10 is a side view of an opening device according to the prior art of the present invention.

[Explanation of symbols]

 A Main pipe B Branch pipe C Branch opening P Lining tube 11 Traveling body 12 Swinging head 13 Swiveling nozzle head 14 Traveling guide rod 15 Swinging drive shaft 16 Air motor 18 Worm reduction mechanism 19 Swiveling shaft 20 Intermediate shaft 21 Rotational driving shaft 23a Worm Wheel 23b Worm Wheel 24a Worm 24b Worm 25 Air Motor 26 Air Inlet 28 Nozzle Member 28b Outlet Path (High Pressure Water Passage) 28c Injector 30a High Pressure Water Passage 30b Through Hole (High Pressure Water Passage) 30c Circular Flow (High Pressure Water) Passage 30d Conducting passage (high pressure water passage) 33a High pressure water inlet 35 Ball caster 37 Cylinder

Claims (2)

[Scope of utility model registration request] 1. A device for opening a branch opening of a branch pipe which is closed by lining a flexible tube on the inner surface of the main pipe, wherein the device is provided with a pulling means or a self-propelling means to extend the inside of the main pipe in the longitudinal direction thereof. An oscillating head is connected to a traveling body that is capable of traveling via an oscillating drive shaft supported by the traveling body so as to be swingable around an axis along the traveling direction on the rear side of the traveling body. A worm speed reduction mechanism that transmits the rotational force of the air motor to the swing drive shaft is mounted, and traveling guide rods that are not extended to the swing head side are attached to the left and right sides of the traveling body. When the swing head holds a swirl nozzle head having a swivel axis orthogonal to the traveling direction of the traveling body, and a rotary drive shaft which is rotated by high-pressure air supplied from an air supply port. Together, a high-pressure water passage that guides high-pressure water supplied from the high-pressure water supply port to an injection port provided at the end of the swirl nozzle head, and the rotation of the rotary drive shaft are decelerated and transmitted to the swirl shaft of the swirl nozzle head. A speed reducer, and a ball caster that is located in the center in the width direction and is supported on the inner surface of the main pipe, which is held on the side opposite to the side on which the swirling nozzle is mounted,
An opening device for a pipe inner surface lining tube, which is configured to cut a flexible tube in the branch opening into a circular shape by high-pressure water jetted from a jet port of a swirling nozzle head that swirls at a low speed. 2. The pipe inner surface lining tube perforating device according to claim 1, wherein the traveling body is equipped with a cylinder for pressing the inner surface of the main pipe at a predetermined stop position of the traveling body to fix the traveling body.