JPH071279Y2 - 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 buried pipes such as sewers and waterworks have many years of 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 so-called rehabilitation method has been developed and implemented in which a flexible tube is lined on the inner surface of an existing pipe that is still buried in the ground to repair the existing pipe without changing the installation. . 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, as shown in FIG. 9, in a main pipe A lined with a flexible tube P,
Insert a traveling body M that is equipped with a heating iron W and can be operated remotely, and pull it to the position of the branch pipe B via the cable T while checking it with the TV camera C and heat the branch opening C to the closed tube P. It is known that the iron W rushes and melts and breaks. However, such an opening device using a heating means is applied when the tube P 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). It is difficult, and there is a problem in that the tube region adhered to the inner surface of the main pipe in the periphery is melted and thermally deteriorated.

In order to solve the above-mentioned problem, the present inventor first installed an opening device in which the lining tube of the branch opening was broken by jetting high-pressure water.
Proposed as No. 898. As shown in FIG. 8, in this hole forming device, a revolving nozzle head 2 is rotatably held on a towing or self-propelled traveling body 1, and an acute angle is formed around the nozzle head 2 with respect to the revolving axis. A plurality of injection holes 3 ... Opened in the twisting direction are formed, and while the high-pressure water supplied from the high-pressure water supply port 4 is being injected from each injection hole 3, the nozzle is driven by the reaction force of the injection water. By rotating the head 2 at a high speed, the lining tube blocking the branch opening is broken into a circle. In FIG. 8, 5 is a high-pressure water passage in the traveling body 1, 6 is an annular flow passage communicating with the high-pressure water passage 5 and the respective injection holes 3, ..., 7 is a high-pressure water introduction pipe.

[0006]

However, in the opening device according to the above-mentioned proposal, since the swirling nozzle is swirled by using the reaction force of the jet water, the hydraulic energy loss of the jet water is large and the swirling nozzle swirls at high speed. As a result, the degree of concentration of hydraulic energy per unit length and unit time at the annular cutting line of the lining tube is reduced, so that the rupture efficiency cannot be sufficiently enhanced, while the recent lining tube has a material and structural Since it tends to be extremely diversified, it is difficult to break depending on the type of the tube or it takes a long time to open the hole, and since the high-pressure water is spattered by centrifugal force, the cut end of the tube is not sharp. However, there is a problem that pressure loss increases at the opening.

In view of the above situation, the present invention is an opening device of the type that breaks a lining tube with a branch opening closed by jetting high-pressure water, and is very efficient regardless of the material and structure of the tube. It is an object of the present invention to provide a tube which can be surely cut to open the tube in a short time, a sharp cut can be obtained, and pressure loss at the branch opening can be reduced.

[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. The branch opening of the branch pipe is opened, and an oscillating head is provided on a traveling body that can travel in the longitudinal direction in the main pipe by a traction means or a self-propelling means, and an axis line along the traveling direction of the traveling body. A swing nozzle head having a swing axis orthogonal to the traveling direction of the traveling body, and a rotary drive that is rotated by high-pressure air supplied from an air supply port. A high-pressure water passage that holds the shaft and guides high-pressure water supplied from the high-pressure water supply port to an injection port provided at the end of the swirling nozzle head; and a swirling nozzle head that slows down the rotation of the rotary drive shaft. of And a speed reduction mechanism for transmitting the rotary shaft,
The flexible tube at the branch opening is circularly cut by the high-pressure water jetted from the jet port of the swirling nozzle head that swirls at a low speed.

According to a second aspect of the present invention, in the opening device according to the first aspect, the intermediate shaft is rotatably held in the nozzle driving head, and the intermediate shaft is swung through the mesh of the worm and the worm wheel. A two-stage speed reduction mechanism is constructed by connecting the rotary shaft and the rotary drive shaft of the nozzle head, respectively.

Further, a third aspect of the present invention is the hole forming apparatus according to the first or second aspect, in which a disc brake mechanism for fixing the swing head to the traveling body at a fixed swing position is adopted. It was done.

[0011]

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 moves at a low speed through the speed reducing mechanism. Since it swirls, the degree of concentration of water pressure energy per unit length and unit time in the annular cutting line of the Raininig tube is large, and it is not scattered by centrifugal force, and due to the concentration of extremely high 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 blow, and slowly forms an arc, and a branch opening is opened.
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.

According to the second aspect of the invention, the two-stage speed reducing mechanism by the meshing of the worm and the worm wheel makes it possible to easily set the low speed rotation of the nozzle head utilizing the air pressure,
In addition, the deceleration mechanism section is simple and the operation reliability is excellent.

According to the third aspect of the present invention, the swing head is simply fixed to the traveling body at a fixed swing position by the disc brake mechanism, and the direction of the swing axis of the swirl nozzle head is set to the branch opening portion during the opening operation. It can be maintained in the state of being exactly centered.

[0014]

1 to 3 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 pipe A. 11
Is a traveling body capable of traveling in the main pipe A, 12 is a swing head mounted on the traveling body 11, and 13 is a swirling nozzle head held by the swing head 12.

The traveling body 11 has a mounting base 11a between two traveling guide rods 14 and 14 on the left and right, the front and rear portions of which are warped.
Of the swing drive shaft 15 along the front-rear direction in which the swing head 12 is fixed to the rear end on the base 11a.
Is rotatably held via bearings 15a, 15a, and air for reversibly rotating the swing drive shaft 15 within a range of 120 degrees is provided via a mounting plate 11b provided upright on the front end of the base 14. A rotary actuator 16 and a brake air cylinder 17 are attached. Then, a disc-shaped brake disc 18a is fixed to the front end of the rotary shaft 16a of the actuator 16, and the pusher 18b fixed to the telescopic rod 17a of the air cylinder 17 is pressed against the brake disc 18a to rotate the disc. The shaft 16a and the swing drive shaft 15 connected to the shaft 16a via a coupling 15b are fixed so as not to rotate.

As shown in FIGS. 4 to 6, the swing head 12
The swivel shaft 1 along the vertical direction of the swirl nozzle head 13.
9, the intermediate shaft 20 along the left-right direction, the rotary drive shaft 21 along the front-back direction, a pair of bearings 22a, 22 respectively.
It is rotatably held via a, 22b, 22b, 22c and 22c. The worm wheel 23a fixed to the swivel shaft 19 meshes with the worm wheel 24a fixed to the intermediate shaft 20, and the worm wheel 23b fixed to the intermediate shaft 20 changes to the worm wheel 24b fixed to the rotary drive shaft 21. Due to the engagement, the rotary drive shaft 21
Is reduced and transmitted to the intermediate shaft 20, and the reduced rotation of the intermediate shaft 20 is further reduced and transmitted to the turning shaft 19.

A cylindrical case 12a is provided at the rear of the rocking head 12, and a vane type air motor 25 is provided in the middle of the cylindrical case 12a (see FIGS. 1 to 3). 25a is inserted and arranged in the cylindrical case 12a, and is coaxially connected to the rotary drive shaft 21 via a coupling 21a (see FIG. 6). 25b
Is a silencer provided on the exhaust side of the air motor 25. Then, an air introduction port 26 is opened at the tip of the cylindrical case 12a, and an air hose 27 is connected to the introduction port 26 as shown by the alternate long and short dash line in FIG. Air motor 2
5, the rotary shaft 25a and the rotary drive shaft 21 rotate integrally, and accordingly, the swivel shaft 19 is decelerated by two stages through the intermediate shaft 20 to rotate, and the swirl nozzle head 1
3 makes a slow turn. It should be noted that the turning speed is usually set to one rotation in 4 to 5 minutes.

The swirling nozzle head 13 has a rectangular rod shape,
As shown in FIG. 6, cylindrical shaft-shaped nozzle members 28, 28 are screwed on the upper surfaces of both ends, the upper part of the swivel shaft 19 is passed through the central part, and the flat washer is attached to the bolt part 19a at the upper end thereof. Nut 29 through 29a and S washer 29b
Is fastened by screwing, and is connected to the swivel shaft 19 so as to rotate integrally therewith. The swirl shaft 19 is hollow and forms a high-pressure water passage 30a inside, and the passage 30a is connected to the nozzle head 13 and the swivel shaft 1 through a through hole 30b at the upper end.
9 communicates with an annular flow passage 30c, which is connected to the injection passage 28d of each nozzle member 28 through the passages 30d and 30d along the longitudinal direction of the nozzle head 12.
It communicates with a. In addition, 31 is an O-ring that liquid-tightly seals the upper and lower portions of the annular flow channel 30c, and 13a is a conducting path 30d, 3
A plug for sealing the open end of 0d, and 32 is an oil seal interposed between the upper and lower portions 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 (see FIGS. 1 and 2) is connected to the lower end of the connecting member 33 as shown by the alternate long and short dash line in FIG. By connecting the high-pressure water hose 34 as indicated by the one-dot chain line, the high-pressure water introduced from the hose 34 is connected to the connecting member 3
1 → high pressure water passage 30a → through hole 30b → annular flow path 30c →
It ejects in a thin line shape from the ejection port 28a of each nozzle member 28 through the conduction path 30d. This ejection pressure is usually 600 kg /
It is set to about cm ² .

It should be noted that the air hose (not shown) of the air rotary actuator 16 and the air cylinder 17, the air hose 27 of the air motor 25, and the high-pressure water hose 34 are one as shown by the one-dot chain line in FIGS. It is grouped into a cable 35 and connected at the end to a source of high pressure air and high pressure water.

In order to open the lining tube of the existing sewer pipe using the opening device 10 having the above-described structure, as shown in FIG. 7, the traveling body 11 is moved from _one manhole M ₁ into 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. 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 rotary actuator 16 operates. The swinging head 12 is rotated to set the swivel axis of the swirling nozzle head 13 to a position that is substantially coaxial with the center of the branch opening C, and the pusher 18 is extended by the expansion operation of the air cylinder 17.
a is pressed against the brake disc 18a and the swing head 12
To fix.

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 fine line form from 28a cuts the lined nozzle P at the branch opening C into two arcs as the swirl nozzle head 13 swivels, and finally the arc-shaped cutting lines are cut. It is connected and cut into a circular shape, so the branch opening C
Is opened.

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 wheels may be attached to the traveling body so that the traveling body can be driven by a motor.

[0024]

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.

According to the invention of claim 2, the swirling of the swirling nozzle head utilizing the air pressure can be easily set to a low speed,
Further, there are advantages that the deceleration mechanism section is simple, the operation reliability is excellent, and the entire apparatus can be easily made compact.

According to the third aspect of the present invention, since the swing head can be easily fixed to the traveling body at the fixed swing position by the disc brake mechanism, the direction of the swivel axis of the swirling nozzle head is located at the center of the branch opening. There is an advantage that a precise opening operation can be performed while maintaining a correct fitting state.

[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 vertical sectional front view of a swing head of the same opening device.

5 is a cross-sectional view taken along the line VV of FIG.

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

FIG. 7 is a schematic explanatory view for explaining an opening operation by the opening device.

FIG. 8 is a vertical cross-sectional view of a main part of an opening device according to the prior art of the present invention.

FIG. 9 is an explanatory view showing a conventional opening device: A main pipe B branch pipe C branch opening P lining tube 11 traveling body 12 swing head 13 swing nozzle head 15 swing drive shaft 16 air rotary actuator 17 air cylinder ( Disc brake mechanism 18a Pusher (disc brake mechanism) 18b Brake disc (disc brake mechanism) 19 Swivel shaft 20 Intermediate shaft 21 Rotation drive shaft 23a Worm wheel 23b Worm wheel 24a Worm 24b Worm 25 Air motor 26 Air inlet 28 Nozzle member 28a Injection port 30a High pressure water passage 30b Through hole (high pressure water passage) 30c Annular flow passage (high pressure water passage) 30d Conducting passage (high pressure water passage) 33a High pressure water inlet

Claims (3)

[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. A swinging head is mounted on a traveling body that is capable of traveling so as to be swingable around an axis line along the traveling direction of the traveling body, and a swinging axis that is orthogonal to the traveling direction of the traveling body is attached to the swinging head. The jet nozzle having the swirling nozzle head and the rotary drive shaft rotated by the high-pressure air supplied from the air supply port, and the high-pressure water supplied from the high-pressure water supply port provided at the end of the swirling nozzle head A high-pressure water passage leading to the rotary drive shaft, and a reduction mechanism for reducing the rotation of the rotary drive shaft and transmitting the reduced speed to the rotary shaft of the rotary nozzle head.
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. An intermediate shaft is rotatably held in the nozzle drive head, and the intermediate shaft is connected to the swivel shaft and the rotary drive shaft of the swivel nozzle head through meshing of a worm and a worm wheel, respectively, and is decelerated in two stages. The opening device for a pipe inner surface lining tube according to claim 1, which constitutes a mechanism. 3. A disk brake mechanism for fixing the swing head to the traveling body at a fixed swing position.
Or the opening device of the pipe inner surface lining tube according to 2.