JP2000061899A - Device for opening lining tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily adjust the displacement, if occurring, of a high pressure water spray nozzle from a branch opening to the axial direction of a main pipe. SOLUTION: In a device for opening a branch opening C of a branch pipe B blocked by a lining tube P on the inner face of a main pipe A, a nozzle- mounted head 3 is connected to a traveler 2 traveling in the main pipe A via a connection shaft 4 and a high pressure water injection nozzle 5 is mounted on the head 3 for cutting the flexible tube P of the branch opening C. The traveler 2 includes an oscillation driving means 8 for rotationally driving the connection shaft 4 to oscillate the head 3 at a required angle range around the connection shaft 4 and a forward/backward driving means 9 for moving the connection shaft 4 forward and backward in its axial direction to move the head 3 to the traveler 2 forward and backward in its traveling direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when lining and repairing a flexible tube on the inner surface of a main pipe of an underground pipe,
The present invention relates to a device for opening a branch opening of a branch pipe closed by a lining.

[0002]

2. Description of the Related Art Underground buried pipes such as waterworks and sewerage pipes have misaligned or cracked pipe joints, corrosion of metal pipes, etc. due to long-term use. 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. In order to deal with this, it is desirable to replace the buried pipe with a new pipe, but due to road conditions and surrounding circumstances such as complicated underground buried and aboveground structures, excavation work on the ground itself has become extremely difficult in recent years. It becomes difficult and the construction cost is enormous.

Therefore, a method of repairing an existing pipe without laying it by lining 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 is adhered to the inner surface of the tube and fixed in an unheated state. However, in such a recycling method, when a 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.

As a device for opening the branch opening after the tube lining as described above, there is one disclosed in Japanese Utility Model Publication No. 7-8159 by the inventor of the present application. This opening device connects a nozzle mounting head to a traveling body that travels in the longitudinal direction of the main pipe by a pulling means or a self-propelling means via a connecting shaft that extends along the traveling direction of the traveling body, and to this head. , High-pressure water jet that cuts the flexible tube at the branch opening by jetting high-pressure water from a jet end of the nozzle end in a direction along the swirl axis while swirling around a swirl axis orthogonal to the traveling direction of the traveling body A nozzle and a ball caster supported on the inner surface of the main pipe on the side opposite to the nozzle mounting side are provided, and the traveling body is driven to rotate the connecting shaft to swing the head around the connecting shaft in a required angle range. A dynamic drive means and a pair of left and right traveling guide rods supported on the inner surface of the main pipe at one side of the traveling body are provided.

[0005]

According to the above-described conventional opening device, the high-pressure water jet nozzle of the nozzle mounting head is provided when the traveling body traveling by the towing means or the self-propelling means is stopped at the required position in the main pipe. Is displaced in the circumferential direction of the main pipe with respect to the position directly below the branch opening, the connecting shaft is rotationally driven by the rocking drive means to rock the nozzle mounting head around the connecting shaft by the required angle. By doing so, the swirl axis of the high-pressure water injection nozzle can be adjusted so as to be concentric with the branch opening, but the high-pressure water injection nozzle is misaligned in the axial direction of the main pipe with respect to the position directly below the branch opening. In such a case, the position is adjusted while moving the stopped running body back and forth along the longitudinal direction of the main pipe A by the towing means or the self-propelling means, so that the adjustment is extremely time-consuming and time-consuming. Working and opening work The was bad.

In view of the above problems, the present invention makes it easy and easy to adjust the displacement when the high-pressure water injection nozzle is displaced in the axial direction of the main pipe with respect to the position directly below the branch opening. An object of the present invention is to provide a perforating device for a pipe inner surface lining tube that can be performed.

[0007]

The invention according to claim 1 is
A device for opening a branch opening C of a branch pipe B closed by lining a flexible tube P on the inner surface of the main pipe A, the length of which extends inside the main pipe A by a traction means or a self-propelled means. To the traveling body 2 traveling along the direction,
The nozzle mounting head 3 is connected via the connecting shaft 4 extending along the traveling direction of the nozzle 3 and the head 3 is swung by the swivel shaft 40 orthogonal to the traveling direction of the traveling body 2 from the injection port 51c at the nozzle end. A high-pressure water jet nozzle 5 for jetting high-pressure water to cut the flexible tube P of the branch opening C is attached, and the traveling body 2 is driven to rotate the connecting shaft 4 to rotate the head 3 around the connecting shaft 4. An oscillating drive means 8 for oscillating a required angle range, and an anteroposterior drive means 9 for moving the connecting shaft 4 back and forth in the axial direction to move the head 3 forward and backward with respect to the traveling body 2 are provided. Is characterized by.

According to a second aspect of the present invention, in the opening device for a pipe inner surface lining tube according to the first aspect, a pressing piece 10 arranged on the opposite side of the traveling guide rods 7, 7 and the pressing piece 10 are provided on the traveling body 2. The traveling body 2 is provided with a traveling body fixing cylinder 11 that is pressed against the inner surface of the main pipe A at the stop position and that fixes the traveling body 2 in a stretched state together with the traveling guide rods 7 and 7 that receive the reaction force. Characterize.

[0009]

1 to 4 show an opening device 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. 1 is shown. In these drawings, 2 is a traveling body that travels in the main pipe A, 3 is a nozzle mounting head that is connected to the rear side of the traveling body 2 via a connecting shaft 4 that extends along the traveling direction of the traveling body 2, The high-pressure water jet nozzle 5 is attached to one side surface portion of the nozzle attachment head 3, and the nozzle attachment head 3
Ball caster 6 on the side surface opposite to the nozzle mounting side of
Is provided.

On one side (lower side in FIG. 1) of the traveling body 2, a pair of left and right traveling guide rods 7, 7 supported on the inner surface of the main pipe A are extended over substantially the entire length of the traveling body 2. The mounting base 2a is laid between the two traveling guide rods 7, 7. On the mounting base 2a, swing drive means 8 for rotating the connecting shaft 4 to swing the nozzle mounting head 3 around the connecting shaft 4 in a required angle range.
And a front-back drive means 9 for moving the connecting shaft 4 back and forth in the axial direction to move the nozzle mounting head 3 forward and backward with respect to the traveling body 2.

Further, the traveling body 2 is provided with a pair of pressing pieces 10 and 10 located on both sides of the traveling body 2 on the opposite side (upper side in FIG. 1) of the traveling guide rods 7 and 7 (upper side in FIG. 1). ,
At the stop position of the traveling body 2, each pressing piece 10 is pressed against the inner surface A of the main pipe, and the traveling guide rods 7 and 7 receiving the reaction force thereof are fixed together with the traveling body 2 in the main pipe A in front and rear directions. The traveling body fixing cylinders 11 and 11 of
As shown in FIGS. 1 and 2, the pair of traveling body fixing cylinders 11 and 11 are installed on the left and right sides of the front and rear ends of the mounting base 2a.

The connecting shaft 4 is a mounting base 2a of the traveling body 2.
It is rotatably supported in a gear box 12 fixed to the shaft and movable in a certain range in the axial direction. That is, as can be seen from FIG. 5, the front end side of the connecting shaft 4 is made rotatable by the bearing member 13, and the rear end side is made rotatable by the shaft hole 38 of the fixing member 12a via the sleeve 14 and in the axial direction. It is movably supported, and the connecting shaft 4
The rear end portion of the nozzle mounting head 3 via the flange 15.
Is integrally connected and fixed to the front surface of the. Sleeve 14
Is externally fitted so as to be rotatable with respect to the connecting shaft 4 but immovable in the axial direction. A central worm gear 17 for transmitting rotation is provided at a fixed position in the central portion of the gear box 12, and the central worm gear 17 is fitted onto the connecting shaft 4 and the key 18 of the central worm gear 17 is connected to the connecting shaft 4. It is fitted in a long key groove 19 of No. 4 so as to be slidable relatively. Therefore, the axial length by which the key 18 of the central worm gear 17 can move relative to the long key groove 19 of the connecting shaft 4 is the maximum moving range of the connecting shaft 4, and the maximum moving range of the connecting shaft 4 is It is shown by L in FIG.

A swing drive means 8 for swinging the nozzle mounting head 3 around the connecting shaft 4 is, as shown in FIGS. 5 and 6, an air motor 20 connected to the front end of the gear box 12, A drive shaft 22 extending in the front-rear direction, which is connected to the rotary shaft 20a via a coupling 21, a worm 24 provided on the drive shaft 22, and a worm 24 disposed laterally of the drive shaft 22 in a direction orthogonal to the drive shaft 22. An intermediate shaft 23 provided, a worm gear 25 fixed to one end side of the intermediate shaft 23 and meshing with a worm 24 of the driving shaft 22, and a central worm gear 17 provided on the other end side of the intermediate shaft 23. And a worm 26 that meshes.

Therefore, the rotary shaft 20a of the air motor 20
Is rotated in either forward or reverse direction, the rotation is
The nozzle mounting head 3 is decelerated by passing through the worm 24, the worm gear 25, the intermediate shaft 23, the worm 26, and the central worm gear 17, and is transmitted to the connecting shaft 4, and the rotation of the connecting shaft 4 causes the nozzle mounting head 3 to move within a range of, for example, 120 °. Three
Can be rocked.

Further, as shown in FIGS. 5 and 6, the front-rear drive means 9 for moving the nozzle mounting head 3 forward and backward with respect to the traveling body 2 is connected to the front end of the gear box 12 by air. A motor 27, a driving shaft 28 that extends in the front-rear direction and is linked to a rotation shaft (not shown) of the motor 27, and a worm 29 provided on the driving shaft 28.
An intermediate shaft 30 disposed laterally of the driving shaft 28 in a direction orthogonal to the driving shaft 28; a worm gear 31 fixed to one end of the intermediate shaft 30 and meshing with a worm 29 of the driving shaft 28; Worm 32 provided on the other end of shaft 30
A drive shaft 33 that extends laterally of the intermediate shaft 30 at right angles to the intermediate shaft 30 and extends in the front-rear direction in parallel with the connecting shaft 4;
A worm gear 34 that is provided at one end of the drive shaft 33 and meshes with the worm 32 of the intermediate shaft 30, a male screw portion 35 formed on the other end of the drive shaft 33, and a male screw portion 35 of the drive shaft 33. And a rear end portion of the sleeve 14 externally fitted to the rear end portion of the slide member 36 and the connecting shaft 4, and the rear end portion of the slide member 36 is slidably supported in the square hole 39 of the fixing member 12a. And a connecting member 37 for integrally connecting and fixing and.

Therefore, when the rotation shaft of the air motor 27 rotates in either forward or reverse directions, the rotation of the air motor 27 causes the drive shaft 28, the worm 29, the worm gear 31, the intermediate shaft 30, and the worm 3 to rotate.
2. The speed is reduced by passing through the worm gear 34 and transmitted to the drive shaft 33, and the rotation of the drive shaft 33 causes the slide member 36 to slide in the front-rear direction with respect to the fixed member 12a of the gear box 12, whereby the connecting shaft 4 Moves forward and backward in the axial direction via the connecting member 37 and the sleeve 14, and the traveling body 2 can move forward and backward in the traveling direction by the movement of the connecting shaft 4.

On the other hand, in FIGS. 7 and 8, the nozzle mounting head 3 has a swivel shaft 40 along the up-down direction of the high-pressure water jet nozzle 5, an intermediate shaft 41 along the left-right direction, and a rotary drive shaft 42 along the front-rear direction. , Respectively, are rotatably held via bearings. Therefore, the worm gear 43 fixed to the swivel shaft 40 is attached to the worm 4 provided on the intermediate shaft 41.
4, the worm gear 45 fixed to the intermediate shaft 41 meshes with the worm 46 provided on the rotary drive shaft 42, whereby the rotation of the rotary drive shaft 42 is decelerated and transmitted to the intermediate shaft 41. The decelerated rotation of the intermediate shaft 41 is further decelerated and transmitted to the turning shaft 40.

Further, a cylindrical case 47 is projectingly provided at the rear portion of the nozzle mounting head 3, and an air motor 48 is provided in the middle thereof (see FIGS. 1 and 2), and a rotation shaft 48a of the air motor 48 is provided. It is inserted in the cylindrical case 47 and is coaxially connected to the rotary drive shaft 42 via a coupling 49 (see FIG. 8). Then, an air inlet (not shown) opened at the tip of the cylindrical case 47.
By supplying the high pressure air by connecting the air hose 50 to the air hose 50, the air motor 48 operates and the rotary shaft 48a and the rotary drive shaft 42 rotate integrally.
The revolving shaft 40 is decelerated by two stages through the rotation, and the high-pressure water injection nozzle 5 revolves at a low speed integrally therewith.
The turning speed is usually set to make one rotation in 4 to 5 minutes.

The high-pressure water jet nozzle 5 is in the shape of a rectangular rod, and as shown in FIG. 7, nozzle members 51, 51 are fixed by nuts 51a at both open ends in the longitudinal direction.
Each nozzle member 51 has a lead-out path 51b along its axial direction.
An injection hole 51c extending parallel to the swivel axis 40 is formed at the tip of the communication hole. Then, the high-pressure water jet nozzle 5
Is connected to the swivel shaft 40 so as to rotate integrally with the swivel shaft 40 by penetrating the upper end of the swivel shaft 40 and screwing a nut 52 into the screw shaft part 40a at the upper end. The swirl shaft 40 is hollow and has a high-pressure water passage 40a formed therein. The passage 40a is an annular structure formed between the high-pressure water jet nozzle 5 and the swivel shaft 40 via a through hole 40b at the upper end. The annular flow passage 40c communicates with the flow passage 40c, and communicates with the injection port 51c of each nozzle member 51 via the conduction passages 40d, 40d and the discharge passages 51b, 51b along the longitudinal direction of the high-pressure water jet nozzle 5. .

Therefore, the high pressure water passage 40a of the swivel shaft 40
A universal joint type hose connecting member 53, which can be omitted, is connected to the inlet port 40e at the lower end of the high pressure water inlet 53a of the connecting member 53 to connect the high pressure water hose 54 to the high pressure water. Member 53 → Inlet port 40
e → high pressure water passage 40a → through hole 40b → annular flow path 40c →
It is ejected in a thin line form from the ejection port 51c of each nozzle member 51 through the conduction path 40d and the outlet path 51b. This ejection pressure is usually set to about 600 Kg / cm ² .

As shown in FIGS. 1, 3, 7, and 8, the side surface of the nozzle mounting head 3 opposite to the side surface on which the high-pressure water jet nozzle is mounted, that is, the lower side surface of the nozzle mounting head 3, has a central portion 1 in the width direction. Individual ball casters 6 are attached so as to project through a holder 55, and the ball casters 6 are in contact with the inner surface of the main pipe A to support the nozzle attachment head 3.

Further, as shown in FIG. 4, the pressing pieces 10 arranged at the front and rear positions on the opposite side of the traveling guide rods 7, 7 in the traveling body 2 are arcuate pressing surfaces along the inner surface of the main pipe A. It is formed in an arch shape having 10a, and both ends of the arch-shaped pressing piece 10 are provided on the mounting base 2a of the traveling body 2 so as to stand upright on the pair of left and right traveling body fixing cylinders 11, 1.
1 are linked to each other. As described above, each pressing piece 10 is formed in an arc shape having the arcuate pressing surface 10a along the inner surface of the main pipe A, whereby a strong pressing force can be exerted on the inner surface of the main pipe A, and each arch shape Pressing piece 1
Both left and right ends of 0 are a pair of left and right traveling body fixing cylinders 1
By interlocking with 1 and 11, each arch-shaped pressing piece 10 can be pressed against the inner surface of the main pipe A in a stable state.

The air hoses (not shown) of the air motors 8 and 9 and the cylinder 11 on the traveling body 2 side, and the air hose 50 and the high pressure water hose 54 of the air motor 48 on the nozzle mounting head 3 side are shown in FIGS. As shown in FIG. 7, the cable 56 is bundled and is connected to the high pressure air and high pressure water supply source S (FIG. 9) at the end. Reference numeral 57 is an eye nut fixed to the front end of the traveling body 11 and connected to the pulling wire W.

To open the lining tube of the existing sewer pipe using the opening device 1 constructed as described above,
As shown in FIG. 10, the traveling body 2 is attached to one manhole M1.
To the main pipe A of the sewer pipe, and the pulling wire W inserted into the main pipe A from the other manhole M2 is connected to the front end of the traveling body 2. And the wire W by the winch
While moving the traveling body 2 by pulling on the traveling body 2, the position of the branch opening C of the branch pipe B is detected by a TV camera installed on the traveling body 2 or an appropriate sensor (not shown), and the traveling body 2 is moved to a predetermined position ( That is, the high-pressure water jet nozzle 5 of the nozzle mounting head 3 connected to the traveling body 2 is stopped at a position where the branch opening C of the branch pipe B can be opened.

The traveling body 2 travels stably because the left and right traveling guide rods 7, 7 slide and guide the inner surface of the main pipe A during traveling thereof, and the nozzle mounting head 3 intervenes through the ball caster 6. Sliding on the inner surface of the main pipe A. Since the traveling guide rods 7 and 7 have a length substantially corresponding to the entire length of the traveling body 2 and are relatively short ones that do not extend to the nozzle mounting head 3 side, it is easy to respond to downsizing of the entire apparatus. Up,
There is no fear of disturbing the swing of the nozzle mounting head 3.

When the traveling body 11 stops at a predetermined position,
A pair of left and right traveling body fixing cylinders 11 installed at both front and rear sides of the traveling body 2 are respectively extended to actuate the two traveling body rods 7 and 7 on both sides of the traveling guide rods 7 and 7. When the pieces 10 and 10 are pressed against the inner surface of the main pipe A as shown by the phantom lines in FIG. 4, the traveling guide rods 7 and 7 and the two pressing pieces 10 and 10 which receive the reaction force of the traveling body 2
1 is stretched and fixed to the inner surface of the main pipe A. Therefore, it is possible to prevent the traveling body 2 from moving inadvertently back and forth due to the reaction force when the high-pressure water jet nozzle 5 jets high-pressure water.

In this case, the pressing piece 10 may be provided only at one location in the longitudinal intermediate portion of the traveling body 2, but if it is provided at two locations on the front and rear end portions of the traveling body 2, the high pressure water is jetted. The reaction force acting on the traveling body 2 side by the traveling guide rod 7,
7 and the front and rear pressing pieces 10 and 10 can sufficiently support the traveling body 2 together with the nozzle mounting head 3 and can be securely fixed.

When the traveling body 2 is fixed to the stop position as described above, the high-pressure water jet nozzle 5 of the nozzle mounting head 3 is displaced in the circumferential direction of the main pipe A from the position directly below the branch opening C. In this case, the swinging drive means 8 rotationally drives the connecting shaft 4 to swing the nozzle mounting head 3 around the connecting shaft 4 by a required angle, and the swivel shaft 40 of the high-pressure water jet nozzle 5 branches. Adjust so that it is concentric with part C.

When the traveling body 2 is fixed at the stop position, the high-pressure water jet nozzle 5 of the nozzle mounting head 3 is displaced in the axial direction of the main pipe A from the position directly below the branch opening C. In this case, the connecting shaft 4 can be moved by the front-back drive means 9.
By moving the nozzle mounting head 3 forward and backward relative to the traveling body 2 by a required amount, and adjusting so that the swivel shaft 40 of the high-pressure water jet nozzle 5 is concentric with the branch opening C.

That is, as can be seen with reference to FIG. 9, the swivel axis 40 of the high-pressure water jet nozzle 5 is located at the stop O of the traveling body 2 as shown in FIG.
When the position is slightly deviated to the front side in the traveling direction, the connecting shaft 4 is moved forward by the front-rear driving means 9,
By advancing the nozzle mounting head 3 with respect to the traveling body 2, the swivel shaft 40 of the high-pressure water jet nozzle 5 is moved to the branch opening C.
It is made to coincide with the axis O of. Further, as shown in FIG. 3B, when the swivel shaft 40 of the high-pressure water jet nozzle 5 is slightly displaced rearward in the traveling direction with respect to the axis O of the branch opening C at the stop position of the traveling body 2. Moves the connecting shaft 4 backward by the front-rear driving means 9 and moves the nozzle mounting head 3 backward with respect to the traveling body 2, whereby the high-pressure water jet nozzle 5
The orbiting shaft 40 of is aligned with the axis O of the branch opening C.

After the high-pressure water jet nozzle 5 of the nozzle mounting head 3 has been positioned so as to be concentric with the branch opening C as described above, the air motor 48 on the nozzle mounting head 3 side is driven. When the high-pressure water jet nozzle 5 is swung at a low speed and high-pressure water is introduced from the high-pressure water hose 54, the branch opening C is formed by the high-pressure water jetted from both jet ports 51c, 51c of the high-pressure water jet nozzle 5 in a thin line. The linear igniter tube P is sharply cut into two arcs with the turning of the high-pressure water jet nozzle 5, and finally the two arcuate cutting lines are connected to each other to be cut into a circle, and the branch opening C Is opened. At this time, the reaction force when the high-pressure water is jetted from the high-pressure water jet nozzle 5 is received on the inner surface side of the main pipe A via the ball caster 35, so that the nozzle mounting head 3 is also held in an appropriate posture.

Incidentally, it is possible to correspond to the branch openings C having different diameters by detaching and replacing the high-pressure water jet nozzles having different lengths. Further, in this embodiment, the traveling body is towed by the winch, but wheels may be attached to the traveling body 2 so that the traveling body 2 can be driven by a motor.

[0033]

According to the opening device of the first aspect of the present invention, the traveling body is provided with the swing drive means for swinging the nozzle mounting head about the connecting shaft in the required angle range and the connecting shaft in the axial direction. Since the head front-rear driving means for moving back and forth to move the head forward and backward with respect to the traveling body is provided, when the traveling body is stopped at a required position in the main pipe, the high-pressure water jet nozzle of the nozzle mounting head. However, when the nozzle mounting head is displaced in the circumferential direction of the main pipe with respect to the position directly below the branch opening, the swinging drive means swings the nozzle mounting head around the connecting shaft by a predetermined angle, so that the high pressure water jet nozzle While the displacement in the main pipe circumferential direction can be adjusted, if the high-pressure water jet nozzle is displaced in the axial direction of the main pipe with respect to the position directly below the branch opening, the connecting shaft is moved back and forth by the front-rear drive means. The nozzle mounting head. The by moving appropriate before and after the running direction relative to the running body, the traveling body while stopped, it is possible to adjust the displacement of the main pipe axis direction of the high-pressure water jet nozzle simply and easily.

According to the opening device of the invention of claim 2,
At the stop position of the traveling body, the pressing piece presses against the inner surface of the main pipe by the traveling body fixing cylinder, and the reaction force supports and fixes the traveling guide rod to the inner surface of the main pipe. It is possible to prevent the traveling body from being inadvertently moved back and forth by the force.

[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 rear view of the opening device.

FIG. 4 is a front view of the hole opening device.

FIG. 5 is a plan sectional view showing a swing drive means and a front-back drive means in the same opening device.

6 is a cross-sectional view taken along line XX of FIG. 5, with the gearbox removed.

FIG. 7 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 8 is an enlarged sectional view taken along line ZZ of FIG.

9 (A) and 9 (B) are explanatory views showing a forward / backward movement adjusting operation of the nozzle mounting head by the forward / backward driving means.

FIG. 10 is a schematic explanatory view for explaining a hole opening operation by the hole opening device.

[Explanation of symbols]

A main B branch pipe C branch opening P lining tube 1 Opening device 2 running bodies 3 nozzle mounting head 4 connection shaft 5 High-pressure water jet nozzle 6-ball caster 7 Travel guide rod 8 Swing drive means 9 Front-rear driving means 10 pressing piece 11 Traveling body fixing cylinder

Claims (2)

[Claims] 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 pulling means or the self-propelling means moves the inside of the main pipe in the longitudinal direction thereof. A nozzle mounting head is connected to a traveling body that travels along a traveling direction of the traveling body through a coupling shaft that extends along the traveling direction of the traveling body. A high-pressure water injection nozzle that injects high-pressure water from the injection port of the section to cut the flexible tube at the branch opening is attached to the traveling body, and is supported on the inner surface of the main pipe at one side of the traveling body. A pair of left and right traveling guide rods, a swing drive means for rotationally driving the connecting shaft to swing the head around the connecting shaft in a required angle range, and a back-and-forth movement of the connecting shaft in the axial direction to make the head a traveling body. On the other hand, move back and forth in the traveling direction A device for opening a pipe inner surface lining tube, which is provided with a head front-back driving means. 2. A pressing piece arranged on the opposite side of the traveling guide rod, and the pressing piece is pressed against the inner surface of the main pipe at the stop position of the traveling body, and travels in a stretched state together with the traveling guide rod which receives the reaction force. An opening device for a pipe inner surface lining tube in which a traveling body fixing cylinder for fixing the body is provided on the traveling body.