CN219493269U - Jacking device for manual jacking pipe - Google Patents

Abstract

The utility model provides a jacking device for a manual jacking pipe. The jacking device at least comprises a component connecting pipe, a tunneling pipe and two or more groups of deviation correcting components. The tunneling tube is provided with a stepped housing. One end of the tunneling pipe is embedded into one end of the connecting pipe. A gap exists between the part of the tunneling pipe nested in the connecting pipe and the connecting pipe. And two ends of the deviation correcting component are respectively connected with the connecting pipe and the tunneling pipe. Two or more sets of deviation correcting components are arranged in a mode of changing the included angle between the connecting pipe and the tunneling pipe by setting different lengths. The inner wall of the connecting pipe is provided with a first telescopic piece. Under the condition that the length setting of the deviation correcting assembly is finished, the first telescopic piece drives the connecting pipe and the tunneling pipe to complete jacking by changing the length of the first telescopic piece. In the jacking pipe construction process, the first telescopic piece can contact the jacking pipe fitting, and provide tension for the jacking pipe fitting when the jacking pipe fitting is stressed and jacked, so that the jacking pipe fitting and the jacking force application assembly of the jacking pipe fitting are matched with each other in a jacking manner.

Description

Jacking device for manual jacking pipe

Technical Field

The utility model relates to the field of underground construction, in particular to a jacking device for manual jacking pipes.

Background

With the rapid development of social economy, the pipe jacking construction is increasingly used for design construction units at home and abroad, and the adoption of the pipe jacking not only avoids the defect of damaging the original pavement infrastructure, but also is more beneficial to relieving the traffic guiding problem caused by the excavation surface. In order to reduce the influence of ground excavation work on ground buildings, pipe jacking construction is largely adopted, in the pipe jacking construction process, the stress field of soil around the pipe jacking is changed, particularly in soft soil areas, the soil is greatly deformed due to the change of the stress field, the stress condition of a tunnel structure can be deteriorated, the tunnel is caused to be greatly unevenly settled, so that the stress of a jacking device is uneven, posture deviation is caused in the pipe jacking process, and even tool pipe pricking is caused. In the prior art, most of jacking devices positioned at the forefront end in pipe jacking construction can only passively cut into a soil layer under the action of a rear-end jacking device, and an active jacking function is lacked.

The patent with publication number CN214940127U discloses a front-mounted steel casing oil top deviation rectifying jacking pipe device, which comprises a steel casing body, an arc-shaped frame, a supporting rod, a circular frame, a mounting plate, an oil top, an arc-shaped plate, rollers and a jacking pipe. According to the utility model, the front steel protection cylinder is added on the muddy water balance jacking pipe, the front steel protection cylinder is placed firstly, then the jacking pipe machine head is installed in the front steel protection cylinder to protect the machine head, and meanwhile, four oil tops are installed in the steel protection cylinder body, so that different angles can be formed by fine adjustment of the oil tops, the jacking direction of a pipeline is changed, and correction is performed. The deviation-correcting jacking pipe device can form different angles through fine adjustment of the oil jacking, change the jacking direction of a pipeline and correct deviation, but lacks an active jacking function, and still can jack by pushing force applied by the jacking pipe.

The patent with publication number CN213332729U discloses a jacking pipe relay jacking device with light and shade combination, which comprises an operation cavity, a rail car and a relay jacking mechanism; the bottom of the working cavity is paved with a rail, a rail car for bearing the jacking pipeline is arranged on the rail, and a relay jacking mechanism is arranged behind the rail car. The patent adds a working cavity in the middle of the jacking construction section, and the jacking pipeline in the second half section of the jacking construction section is jacked in the working cavity by utilizing a hydraulic jack. The jacking device prolongs the jacking construction section, increases the continuity of construction, but has the defect that the corresponding jacking posture adjustment cannot be performed on the jacking direction deviation caused by land subsidence.

Therefore, the prior art needs to be improved, a jacking device for the manual jacking pipe is designed, the jacking gesture can be adjusted through the deviation correcting component under the condition that the jacking direction is deviated due to soil layer settlement and the like, so that the jacking direction of jacking pipe construction is ensured, and the jacking device can drive a tunneling pipe to jack under the condition that the gesture adjusting of the deviation correcting component is completed, and can open a notch in the soil layer while ensuring the consistency of the jacking direction, so that the jacking difficulty of a subsequent pipeline is reduced. The utility model can also realize the collaborative jacking of jacking pipe fittings by providing tension to the pipeline when the constructor performs the jacking of the pipeline.

Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, as the inventors studied numerous documents and patents while the present utility model was made, the text is not limited to details and contents of all that are listed, but it is by no means the present utility model does not have these prior art features, the present utility model has all the prior art features, and the applicant remains in the background art to which the rights of the related prior art are added.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a jacking device for manual jacking pipes. The jacking device at least comprises a component connecting pipe, a tunneling pipe and two or more groups of deviation correcting components. And two ends of the deviation correcting component are respectively connected with the connecting pipe and the tunneling pipe. The deviation correcting component changes the included angle between the connecting pipe and the tunneling pipe in a mode of changing the length of the deviation correcting component, so that the jacking postures of the connecting pipe and the tunneling pipe are adjusted. The inner wall of the connecting pipe is provided with a first telescopic piece. Under the condition that the length setting of the deviation correcting assembly is finished, the first telescopic piece drives the connecting pipe and the tunneling pipe to move in a mode of changing the length of the first telescopic piece, so that jacking is finished. One end of the tunneling pipe is embedded into one end of the connecting pipe. And a gap exists between the part of the tunneling pipe nested in the connecting pipe and the connecting pipe. The gap provides a space for changing an included angle between the connecting pipe and the tunneling pipe. Preferably, in the jacking pipe construction process, the first telescopic piece can contact the jacking pipe fitting, provide a pulling force for the jacking pipe fitting when the jacking pipe fitting is stressed and jacked, and realize cooperation relay jacking with the jacking force application assembly of the jacking pipe fitting.

According to a preferred embodiment, the deviation rectifying assembly comprises a first connecting plate, a second telescopic member and a second connecting plate. At least two first connecting plates are arranged at the positions, close to the tunneling pipe, on the inner side of the pipe wall of the connecting pipe. At least two second connecting plates are circumferentially arranged along the inner wall of the tunneling pipe. The second telescopic piece is connected with the connecting pipe and the tunneling pipe in a mode that two ends of the second telescopic piece are respectively hinged with the first connecting plate and the second connecting plate. Preferably, the present utility model is provided with four sets of correction packs. The four groups of deviation correcting components are distributed in a central symmetry manner along the central axis of the jacking device. The four groups of deviation correcting assemblies enable included angles of the tunneling pipe and the connecting pipe in a three-dimensional space to be changed by setting different lengths of the second telescopic pieces, and therefore adjustment of the jacking direction of the jacking device is achieved.

According to a preferred embodiment, the end of the tunnelling pipe which is not nested into the connecting pipe is provided with a notch. The shell of the end of the tunneling tube far away from the connecting tube forms the top of the tunneling tube. Preferably, the top forms a cap with a notch disposed under the cap. Preferably, the pipe cap and the notch below the pipe cap can ensure that the pipe cap of the tunneling pipe cuts into soil body first when jacking each time.

According to a preferred embodiment, ribs are provided in the tube wall at a position close to the first connection plate for supporting the connection tube. The rib plate comprises a first rib plate, a second rib plate and a third rib plate. The first rib plate and the third rib plate are respectively arranged at two sides of the second rib plate. And the first rib plate, the second rib plate and the third rib plate are all laid along the circumference of the inner wall of the pipe wall.

According to a preferred embodiment, a fourth rib and a fifth rib are arranged above the notch of the tunneling tube and serve as supporting frameworks. The fourth rib plates and the fifth rib plates are arranged in a staggered mode.

According to a preferred embodiment, the first telescopic member is arranged on the side of the third rib remote from the ripping tube. The first telescopic piece is arranged on the inner wall of the pipe wall through the mounting piece, so that the first telescopic piece is relatively fixed with the connecting pipe. Preferably, one end of the first expansion member is in contact with the third rib. When the first telescopic piece stretches, acting force is mainly applied to the third rib plate, so that the tunneling tube is driven to move.

According to a preferred embodiment, the connecting tube is provided with a receiving cavity formed by the tube wall remote from the tunnelling tube. Preferably, the accommodating cavity refers to a cavity-shaped space for accommodating the jacking pipe fitting, and the connecting pipe is used for connecting the cavity-shaped space. Under the condition of manual pipe jacking construction, the accommodating cavity wraps the jacking pipe fitting and provides guiding for jacking of the jacking pipe fitting.

According to a preferred embodiment, a sealing ring is provided at the end of the connection tube remote from the ripping tube. The sealing ring is arranged at the edge of the inner wall of the pipe wall. And under the condition that the jacking pipe fitting enters the accommodating cavity, the sealing ring is in contact with the outer wall of the jacking pipe fitting. Preferably, the sealing ring can prevent sundries such as soil sand and gravel from entering the connecting pipe from a gap between the jacking pipe fitting and the connecting pipe when the soil body is settled due to the dragging of the soil body during jacking of the jacking pipe. Preferably, the sealing ring can ensure that slurry cannot enter the connecting pipe from a gap between the jacking pipe and the connecting pipe when a constructor grouting the outer wall of the jacking pipe to prevent soil from settling.

According to a preferred embodiment, the tunneling tube housing forms an operating chamber around. Under the condition that the tunneling pipe is jacked up, the operation cavity provides a digging operation space for constructors.

According to a preferred embodiment, a plurality of the first telescopic elements and/or the second telescopic elements are distributed on the inner wall of the connecting pipe and/or the tunneling pipe in a spaced manner.

The jacking device for the artificial roof pipe provided by the utility model has at least the following advantages:

(1) According to the jacking device, the second telescopic piece is hinged with the connecting pipe and the tunneling pipe, so that the jacking gesture can be adjusted through the rectifying component under the condition that the jacking direction of the jacking device is deviated due to soil layer settlement and the like, and the jacking direction of jacking pipe construction is ensured;

(2) Under the condition that the length setting of the deviation correcting assembly is completed, the first telescopic piece drives the connecting pipe and the tunneling pipe to complete jacking through extension; the first telescopic piece can also realize the collaborative jacking of the jacking pipe fitting through contraction and the cooperation of the third telescopic piece when a constructor performs pipeline jacking;

(3) According to the utility model, through the cooperative matching of the multiple groups of deviation correcting components, the included angle between the tunneling pipe and the connecting pipe can be adjusted in a three-dimensional space, so that the posture adjustment of the jacking device is realized;

(4) The jacking device performs jacking after finishing posture adjustment of the jacking device, namely, the jacking device performs jacking after finishing angle adjustment of the tunneling pipe and the connecting pipe in a three-dimensional space, so that the next jacking direction is ensured, and the jacking device can be used for jacking pre-control of jacking pipe construction.

Drawings

FIG. 1 is a simplified schematic illustration of a jacking device according to a preferred embodiment of the present utility model;

FIG. 2 is a simplified schematic illustration of a ripper tube of a preferred embodiment of the present utility model;

FIG. 3 is a simplified front schematic view of a ripper tube of a preferred embodiment of the present utility model;

FIG. 4 is a simplified schematic illustration of a connecting tube of a preferred embodiment of the present utility model;

FIG. 5 is a simplified schematic cross-sectional view of a preferred embodiment of the connecting tube of the present utility model at the location of the first telescoping member;

fig. 6 is a simplified working schematic diagram of a jacking device according to a preferred embodiment of the present utility model.

List of reference numerals

100: a jacking device; 101: a receiving chamber; 102: a first telescopic member; 103: a mounting member; 104: a seal ring; 110: a connecting pipe; 111: a tube wall; 112: a first rib; 113: a second rib; 114: a third rib; 120: tunneling a pipe; 121: a rubber ring; 122: an operating chamber; 123: a fourth rib; 124: a fifth rib; 130: a deviation rectifying component; 131: a first connection plate; 132: a second telescopic member; 133: a second connecting plate; 200: jacking the pipe fitting; 201: a first port guard iron; 202: a second port protecting iron; 300: a force bearing wall; 301: and a third telescoping member.

Detailed Description

The following detailed description refers to the accompanying drawings.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The utility model provides a jacking device 100 for manual jacking pipes. Referring to fig. 1, the jacking device 100 preferably includes at least a module connecting tube 110, a tunneling tube 120, and two or more sets of deviation rectifying modules 130. The ripper tube 120 is provided with a stepped housing. The lower end of the housing of the ripper tube 120 nests into the end of the connecting tube 110. There is a gap between the portion of the ripper tube 120 nested in the connection tube 110 and the connection tube 110. The two ends of the deviation rectifying component 130 are respectively connected with the connecting pipe 110 and the tunneling pipe 120. Two or more sets of correction assemblies 130 are provided by varying the angle between the connecting tube 110 and the heading tube 120 by providing different lengths. The inner wall of the connection pipe 110 is provided with a first telescopic member 102.

Preferably, the deviation rectifying assembly 130 includes a first connecting plate 131, a second telescopic member 132 and a second connecting plate 133. At least two first connection plates 131 are provided inside the pipe wall 111 of the connection pipe 110 at positions close to the ripping pipe 120. At least two second connection plates 133 are provided circumferentially along the inner wall of the ripper tube 120. The second telescopic member 132 connects the connection pipe 110 and the tunneling pipe 120 by hinging the first connection plate 131 and the second connection plate 133 at both ends, respectively.

Preferably, a plurality of first telescopic members 102 are distributed on the inner wall of the connection pipe 110 in a spaced manner. Preferably, a plurality of second telescoping members 132 are spaced apart on the inner wall of the ripper tube 120.

Referring to fig. 2, the tunnelling tube 120 is preferably surrounded by a housing defining an operating chamber 122. In the event that the ripper tube 120 is complete with jacking, the operating chamber 122 provides the constructor with excavation operating space.

Preferably, the end of the ripper tube 120 that is not nested into the connecting tube 110 is provided with a notch. The housing of the end of the ripper tube 120 remote from the connecting tube 110 only forms the top of the ripper tube 120. Preferably, the top forms a cap with a notch disposed under the cap. Preferably, the cap and the notch below the cap ensure that the cap of the ripper tube 120 cuts into the soil first each time it is pushed in.

Referring to fig. 3, the present utility model is preferably provided with four sets of correction packs 130. Preferably, the four sets of second connection plates 133 are distributed centrally and symmetrically along the central axis of the jacking device 100. Preferably, the four sets of first connection plates 131 are distributed centrally and symmetrically along the central axis of the jacking device 100. Preferably, the four sets of deflection assemblies 130 are centrally and symmetrically distributed along the central axis of the jacking device 100. The four groups of deviation correcting assemblies 130 change the included angles of the tunneling pipe 120 and the connecting pipe 110 in the three-dimensional space by setting different lengths of the second telescopic pieces 132, so that the jacking direction of the jacking device 100 is adjusted.

Referring to fig. 3, preferably, a fourth rib 123 and a fifth rib 124 as a supporting skeleton are provided above the notch of the tunneling tube 120. The fourth rib 123 and the fifth rib 124 are staggered. Preferably, the fourth rib 123 is disposed at a middle position of the fifth rib 124, and the fourth rib 123 and the fifth rib 124 are perpendicular to each other. Preferably, the fourth rib 123 is located at one side of the fifth rib 124.

Referring to fig. 4, it is preferable that a rib supporting the connection pipe 110 is provided in the pipe wall 111 at a position near the first connection plate 131. The ribs include a first rib 112, a second rib 113, and a third rib 114. The first rib 112 and the third rib 114 are separated on both sides of the second rib 113. And the first rib 112, the second rib 113 and the third rib 114 are all laid circumferentially along the inner wall of the pipe wall 111. Preferably, the first rib 112 and the third rib 114 are the same gauge. Preferably, the first rib 112 and the third rib 114 are square in cross section or rectangular in shape with similar length and width. Preferably, the second rib 113 has a rectangular cross section and a cross section width smaller than either side of the cross section of the first rib 112 or the third rib 114.

Preferably, the first telescoping member 102 is disposed on a side of the third rib 114 remote from the ripping tube 120. The first telescopic member 102 is arranged on the inner wall of the pipe wall 111 through the mounting member 103, so as to realize relative fixation with the connecting pipe 110. Referring to fig. 5, preferably, 4 sets of 8 first telescopic members 102 are centrally and symmetrically distributed on the inner side of the pipe wall 111 along the central axis of the connection pipe 110. Preferably, one end of the first telescoping member 102 is in contact with the third rib 114. When the first telescopic member 102 is extended, a force is mainly applied to the third rib 114, so as to drive the tunneling tube 120 to move.

Preferably, the connecting tube 110 is provided with a receiving cavity 101 formed by the tube wall 111 remote from the tunnelling tube 120. In the case of performing the manual pipe jacking construction, the accommodating chamber 101 wraps the jacking pipe fitting 200, and provides a guide for jacking of the jacking pipe fitting 200.

Preferably, a sealing ring 104 is provided at the end of the connection tube 110 remote from the ripper tube 120. The sealing ring 104 is provided at the inner wall edge of the tube wall 111. In the case where the jacking pipe 200 enters the accommodating chamber 101, the seal ring 104 is in contact with the outer wall of the jacking pipe 200. Preferably, the sealing ring 104 can prevent sundries such as soil sand and gravel from entering the connecting pipe 110 from a gap between the jacking pipe 200 and the connecting pipe 110 when the soil body is settled due to the dragging of the soil body during jacking of the jacking pipe. Preferably, the sealing ring 104 ensures that slurry does not enter the connecting pipe 110 from the gap between the jacking pipe 200 and the connecting pipe 110 when the constructor grouting the outer wall of the jacking pipe 200 to prevent the soil from settling.

Preferably, the jacking device 100 is operated in the manual jacking pipe as shown in fig. 6. Preferably, during the manual pipe jacking construction, the first port guard iron 201 and the second port guard iron 202 serving as stress buffers of the jacking pipe 200 are respectively connected to two ends of the jacking pipe 200. The jacking tube 200 enters the receiving chamber 101. The outer wall of the jacking tube 200 is in contact with the sealing ring 104. Preferably, the sealing ring 104 may be two annular steel sealing brushes with grease applied in between. Preferably, grease is timely replenished during the pipeline jacking process if leakage is found. Preferably, the first port guard iron 201 is connected to the first constriction 102. Preferably, the second port guard iron 202 is in contact with the third telescoping member 301. Preferably, the third telescoping member 301 includes a fixed end and a movable end. The fixed end of the third telescoping member 301 is disposed on the force-bearing wall 300 of the construction well. The movable end of the third telescoping member 301 is in contact with the second port guard iron 202.

Preferably, in the case that the length setting of the deviation correcting assembly 130 is completed, the first telescopic member 102 drives the connecting pipe 110 and the tunneling pipe 120 by changing its own length, so that it is completely jacked. Preferably, the first telescopic member 102 is extended, and the jacking pipeline 200 and the first port guard iron 201 are stable and not moved, so that the acting force of the extension of the first telescopic member 102 enables the connecting pipe 110 and the tunneling pipe 120 to be far away from the jacking pipeline 200, thereby jacking the connecting pipe 110 and the tunneling pipe 120. Preferably, when the third telescopic member 301 is extended, the first telescopic member 102 is contracted simultaneously so that the jacking pipe member 200 approaches the connecting pipe 110 and the tunneling pipe 120, thereby jacking the pipe.

Preferably, in the jacking pipe construction process, the first telescopic piece 102 can contact the jacking pipe fitting 200, provide a pulling force for the jacking pipe fitting 200 while the jacking pipe fitting 200 is jacked under force, and realize cooperation relay jacking with a jacking force application component of the jacking pipe fitting 200. Preferably, hydraulic jacks are used for each of the first telescoping member 102, the second telescoping member 132 and the third telescoping member 301.

It should be noted that the above-described embodiments are exemplary, and that a person skilled in the art, in light of the present disclosure, may devise various solutions that fall within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the utility model is defined by the claims and their equivalents.

Claims (10)

1. The jacking device for the manual jacking pipe is characterized by at least comprising a component connecting pipe (110), a tunneling pipe (120) and two or more groups of deviation correcting components (130);

two ends of the deviation correcting component (130) are respectively connected with the connecting pipe (110) and the tunneling pipe (120);

the deviation correcting assembly (130) can change the included angle between the connecting pipe (110) and the tunneling pipe (120) by changing the length of the deviation correcting assembly so as to adjust the jacking postures of the connecting pipe (110) and the tunneling pipe (120);

the inner wall of the connecting pipe (110) is provided with a first telescopic piece (102), and under the condition that the length setting of the deviation correcting assembly (130) is completed, the first telescopic piece (102) drives the connecting pipe (110) and the tunneling pipe (120) to move in a manner of changing the length of the first telescopic piece, so that the jacking of the first telescopic piece is completed.

2. The jacking device for an artificial roof pipe as claimed in claim 1, wherein one end of the tunneling pipe (120) is fitted into one end of the connecting pipe (110);

the tunneling pipe (120) is nested in the connecting pipe (110), a gap is reserved between the part of the tunneling pipe (120) which is nested in the connecting pipe (110) and the connecting pipe (110), and the gap provides a space for changing an included angle for the connecting pipe (110) and the tunneling pipe (120).

3. The jacking device for the manual jacking pipe according to claim 2, wherein the deviation rectifying assembly (130) comprises a first connecting plate (131), a second telescopic member (132) and a second connecting plate (133);

at least two first connecting plates (131) are arranged at positions, close to the tunneling pipe (120), on the inner side of the pipe wall (111) of the connecting pipe (110);

at least two second connecting plates (133) are circumferentially arranged along the inner wall of the tunneling tube (120);

the second telescopic piece (132) is connected with the connecting pipe (110) and the tunneling pipe (120) in a mode that the two ends of the second telescopic piece are respectively hinged with the first connecting plate (131) and the second connecting plate (133).

4. A jacking device for a roof hose according to claim 3, wherein ribs for supporting the connection tube (110) are provided in the tube wall (111) at a position close to the first connection plate (131); the rib plate comprises a first rib plate (112), a second rib plate (113) and a third rib plate (114), wherein the first rib plate (112) and the third rib plate (114) are respectively arranged on two sides of the second rib plate (113), and the first rib plate (112), the second rib plate (113) and the third rib plate (114) are all circumferentially paved along the inner wall of the pipe wall (111).

5. The jacking device for the artificial roof pipe according to claim 4, wherein a notch is formed at one end of the tunneling pipe (120) which is not sleeved into the connecting pipe (110), a fourth rib plate (123) and a fifth rib plate (124) serving as supporting frameworks are arranged above the notch, and the fourth rib plate (123) and the fifth rib plate (124) are staggered.

6. The jacking device for the artificial roof pipe according to claim 5, wherein the first telescopic member (102) is disposed on a side, away from the tunneling pipe (120), of the third rib plate (114), and the first telescopic member (102) is disposed on an inner wall of the pipe wall (111) through a mounting member (103) to achieve relative fixation with the connecting pipe (110).

7. The jacking device for artificial roof pipes as claimed in claim 6, wherein said connecting pipe (110) is provided with a receiving cavity (101) formed by a pipe wall (111) away from said tunneling pipe (120); under the condition of manual pipe jacking construction, the accommodating cavity (101) wraps the jacking pipe fitting (200) and provides guiding for jacking of the jacking pipe fitting (200).

8. The jacking device for the manual jacking pipe according to claim 7, characterized in that a sealing ring (104) is arranged at one end of the connecting pipe (110) far away from the tunneling pipe (120), the sealing ring (104) is arranged at the edge of the inner wall of the pipe wall (111), and the sealing ring (104) is in contact with the outer wall of the jacking pipe (200) under the condition that the jacking pipe (200) enters the accommodating cavity (101).

9. The jacking device for the manual jacking pipe according to claim 8, wherein the casing of the tunneling pipe (120) surrounds an operation cavity (122), and the operation cavity (122) provides a digging operation space for constructors when jacking of the tunneling pipe (120) is completed.

10. The jacking device for artificial roof pipes as claimed in claim 9, characterized in that a number of said first telescopic members (102) and/or said second telescopic members (132) are distributed in a spaced manner on the inner wall of said connecting pipe (110) and/or said tunnelling pipe (120).