WO1998036206A1

WO1998036206A1 - Drive pipe and locking bell

Info

Publication number: WO1998036206A1
Application number: PCT/EP1998/000603
Authority: WO
Inventors: Hans-Günter Funke; Norbert Funke
Original assignee: Kunststoffröhren Sendenhorst Gmbh
Priority date: 1997-02-15
Filing date: 1998-02-04
Publication date: 1998-08-20
Also published as: EP0892902A1; CZ328098A3; PL329388A1; DE19705857A1; DE19705857C2; AT7376U1

Abstract

In order to improve the sealing properties of two interconnected drive pipes (101, 102) and to achieve positive-fit locking, the invention provides two compatible, esentially L-shaped receiving recesses (115, 119, 122, 129) located one behind the other in a socket end and on a spigot end (111, 120). A receiving recess (122) on the spigot end has a receiving surface (123) in which there is a seal-accomodating groove (130) with a built-in sealing ring (131). Located between the first and second socket end recesses (115, 119) is at least one, at least partially encompassing sliding block (114). Its beveled gliding plane (116) is used for driving on to the anchor block (124) of the spigot end. When the spigot end is pushed into the socket end, the sliding block (114) slides onto the anchor block (124) and comes to rest on the bevel (126.1) of the sliding surface (126) which is sloped at around 45° in the bottom area of its rounded-off sliding face (114). The seal pressing area (113) is raised up so far that it slides over a sealing ring (131) placed in the seal accomodating groove (130) without pushing it out of the groove or damaging it. When pushed in further, the sliding block (114) slides over the sliding plane (126.2) and engages in the sliding recess (128) located behind the anchor block (124) in the receiving end.

Description

Jacking pipe with locking sleeve

The invention relates to a jacking pipe, in particular made of plastic, which has - an inner and an outer wall,

- an insert and

- A spigot end with a circumferential seal receiving recess into which an annular seal can be inserted.

A jacking pipe of the type mentioned is known from DE 94 17 423 UI of the applicant. It is designed as an inliner tube and has an insertion and a pointed end. The tip end has at least one step tip element on its outer wall, on which a sealing element is placed, and has in its inner wall a sealing chamber into which a flexible ring sealing element is inserted. The insertion end has an inner tube extension. The inner tube extension is provided with a sealing chamber in which an annular sealing element is inserted. When connecting two jacking pipes together, the tip end of one jacking pipe is inserted into the insertion end of the other jacking pipe. The inner tube extension slides under the seal chamber and the step tip element under the ring element and thus ensure a tight connection of the jacking pipes with the sealing elements.

This solution has proven itself, but is only able to hold two jacking pipes together. A positive connection is not realized.

From the DE brochure of REHAU: RAULINE B PIPING SYSTEM, publication no. : 367 700 NEB 6.90, 4 sheets, jacking pipes made of polymeric materials are known. They have a lockable, rubber-sealed push-in sleeve that can be axially subjected to pressure and tension. The pipe connection is in the pipe wall.

When inserting a tip end of a jacking pipe into an insertion end of another jacking pipe, a liquid-tight connection is first established. The locking of the two jacking pipes must then be carried out with the aid of a flexible rod which is to be pushed into a recess in the insertion end and inserted accordingly.

From the DE-SCHÖNGEN brochure: Jacking pipe, 1994/1995, 2 sheets, jacking pipes are known which are made of PVC-U without plasticizers and have a pointed and an inserted end. Two sealing chambers are arranged in the tip end, into each of which an annular seal can be inserted. However, inserting the tip end into the insertion end only creates a liquid-tight connection that is detachable and can lead to leaks.

It is therefore the task of further developing a jacking pipe of the known type mentioned at the beginning, that when a tip end of a jacking pipe is inserted into a tip end of another jacking pipe, there is a non-positive connection between them and the sealing behavior of the jacking pipes connected to one another is improved.

According to the invention, this object is achieved by the features of claim 1.

The advantages achieved by the invention are, in particular, that a locking sleeve is created when the tip end is inserted into the insertion end. The locking sleeve ensures a positive connection between jacking pipes. Pressure and tensile loads arising when the jacking pipes are laid are absorbed in such a way that the jacking pipes cannot come apart. A liquid density of the jacking pipes is also ensured.

The sliding block can also be provided with a sliding plane. The sliding plane can be slidable on the sliding surface in such a way that the second plug-in contact recess can be lifted with its sealing press surface over the ring sealing element. This prevents damage to the ring sealing element when pushing together two jacking pipes.

Pushing together is facilitated if the sliding plane of the sliding block is at least partially beveled.

The sliding block can be snapped into the sliding recess and its sliding end face can be placed against the sliding end face of the sliding recess. This ensures that the forces during driving are mainly taken over by these two sliding end faces. A circumferential anchoring recess can be arranged in front of the sliding block in the first insertion recess starting from the inner wall, and a circumferential anchoring block with an at least partially bevelled sliding surface can be arranged on the second tip-end recess emanating from the outer wall. The anchoring recess and the anchoring block are compatible with one another and cause a further locking of two jacking pipes with one another.

The on a receiving surface of the first insertion

Contact recess lying sealing press surface of the second tip-end contact recess can form such a sealing chamber with the sealing receiving recess introduced into the receiving surface that the ring sealing element can be pressed therein. This improves the sealing behavior of the jacking pipes connected to one another.

The seal receiving recess can be designed as a seal receiving groove with a semicircular cross section. The seal receiving groove can also have a semi-ellipsoidal, triangular, square or other polygonal cross section. The formation of the cross section ensures a liquid-tight pressing of the ring sealing element.

The ring sealing element has a round cross section, particularly in the case of a semicircular cross section of the seal receiving groove, so that effective pressing is ensured.

The ring sealing element can consist of an elastomer, in particular a rubber or a plastic, which has a Shore A hardness between 50 and 60. The corners of the stop recesses can be at least partially rounded. This makes it easier to connect two jacking pipes together.

The invention is illustrated in the drawing and is described in more detail below. Show it:

1 is a laying site of jacking pipes in a schematic, partially sectioned representation,

2 shows a detail All according to FIG. 1 with two jacking pipes connected to one another in a schematic, perspective illustration,

3a, 3b and 3c a section of a locking sleeve according to FIG. 2, shown in individual connection stages,

Figure 4 shows an insertion and a spigot end of two jacking pipes to be connected to one another in a further embodiment in a schematic sectional partial illustration; Fig. 5 shows an enlarged section of a

Locking sleeve according to Fig. 4;

6 shows a push-in and a spigot end of two jacking pipes to be connected to one another in a further embodiment, shown during the connection process in a schematic sectional partial representation and

Fig. 7 shows the insertion or pointed end of the jacking pipes from Fig. 6, shown after the connection has been made in a schematic sectional partial view.

Pipelines are usually laid in trenches or below the surface in bores. In certain cases it is a It is not possible to excavate installation channels, e.g. when crossing busy streets, busy squares or buildings. In such cases, as shown in FIG. 1, a vertical shaft 7 is driven into the soil 6. From the shaft bottom, 8 jacking pipes 1, 2, 3 are driven and laid using a jacking pipe laying device 50 below the surface of the earth.

The jacking pipes 1, 2, 3 are made of plastic, in particular a hard PVC. They have a wall thickness that corresponds to the pipe diameter. Your delivery lengths from the pointed end to the insertion end can be 0.7 m, 1 m, 1.20 m, 1.50 m or have the length that is necessary for laying the jacking pipes.

The jacking pipe laying device 50 used for laying consists of an energy center 51, on which storage units 52 are arranged. The storage units 52 can be reached with the aid of a conductor 53. The energy center is connected to a propulsion unit 57 via lines 54. The propulsion unit 57 has a tubular screw 58 which drives a hole into the ground 6. The earth masses generated during drilling are transported to the storage units 152 via the pipelines 54 and the energy center 51 and stored there temporarily. The control center 56 is surrounded by a wheelhouse 55, which is connected to a lifting tool 50. A jacking pipe stack 5 is placed on the earth's surface 8. With the aid of the lifting device, a jacking pipe 4 is prepared for laying for lowering into the shaft 7.

2 and 3a to 3c, a locking sleeve 10 and its details for connecting two jacking pipes 1 and 2 are shown in a first embodiment. In the area of the locking sleeve 10, each jacking pipe has, as here the jacking pipe 1, an insertion end 11; the associated counterpart, the jacking pipe 2, has a compatible tip end 20. The push-in and tip ends of each jacking pipe 1, 2 are arranged at their opposite ends.

Arranged in the insertion and on the tip end 11, 20 are two consecutive, mutually compatible, essentially L-shaped contact recesses 15, 19, 22, 29, namely first and second insertion contact recesses 15, 19 at the insertion end and first and second tip end abutment recesses 22, 19 at the tip end.

The plug-in contact recess 15 is L-shaped from an inner wall 110 of the jacking pipe 1. It is slightly rounded at the angle point to form a fillet. A circumferential anchoring recess 18 is made in it, which has an essentially rectangular cross section. Towards the insertion end, a sliding block 14 adjoins the anchoring recess 18 and has an essentially rectangular cross section. Its downward sliding plane 16 is aligned with a partial length of the insertion contact recess 15.

A second insertion contact recess 19 adjoins the first insertion contact recess 15 in the direction of the insertion end. It is also L-shaped and lies further outside than the first insertion system recess 15. Its one L-leg is formed by a radially extending sliding end face 14 'of the sliding block 14. A second surface of the insertion contact recess 19 is referred to as a sealing press surface 13. This merges at right angles into a radially extending stop surface 12. The transition from the sealing press surface 13 to the stop surface 12 is rounded via a fillet. Compatible elements are provided at the tip end 20. Starting from an outer wall 20, the first tip-end contact recess 22 is delimited by a contact surface 22 'and a receiving surface 23. In the corner corner, the tip end stop recess 22 is rounded by a fillet. A semicircular seal receiving groove 30 is introduced into its receiving surface 23.

The second tip end contact recess 29 is delimited by a sliding surface 25 and a stop surface 29 '. An anchoring block 24 protrudes outward from the stop surface 29 '. It has a sliding surface 26 which is divided in two into a sliding bevel 46.1 inclined by approximately 45 ° and an adjoining sliding plane 26.2. The sliding plane 26.2 merges into a radially directed anchoring surface 27, which is part of a groove-like sliding recess 28. The laying of the jacking pipes is explained with reference to FIGS. 1, 2 and 3a to 3c.

When laying, the jacking pipe 1, jacking pipe 2 and jacking pipe 3 are successively inserted into the bore created by auger 58 (see FIG. 1).

When the jacking pipes are pushed in, the jacking pipes are connected in the area of the locking sleeve 10, which is explained in detail with reference to FIGS. 3a to 3c.

As shown in FIG. 3a, the plug-in end 11 and the tip end 20 lie opposite one another when the jacking pipes 1, 2 are not connected. When the tip end 20 is inserted into the insertion end 11, the sliding block 14 moves towards the anchoring block 24. In the lower area of its rounded sliding end face 14 ', it rests on the sliding bevel 26.1. Due to the inclination of the sliding slope, it reaches the sliding plane 26.2 with its sliding plane 16. This Pushing up is possible with appropriate propulsive force and utilizing the elasticity of the material of the jacking pipe.

It is essential that in a position of the insertion end 11 with respect to the tip end 20 (cf. FIG. 3b), in which the sliding block 14 rests on the anchoring block 24, the sealing press surface 13 is raised to such an extent that it Sealing element 31 with a round cross-section, which is inserted into the sealing receiving groove 30, not only does not damage it, but slides over it without pressing it out of the sealing receiving groove 30. This sliding is facilitated by the rounded edge between the stop surface 12 and the sealing press surface 13.

If the tip end 20 is pushed further into the insertion end 11, the sliding block 14 slides from the anchoring block 26 into the sliding recess 28 in front of it (cf. FIG. 3c). The insertion end 11 and the tip end 20 assume their original dimensions. By reducing the expansion force, the sealing press surface 13 lies non-positively on the receiving surface. This creates a sealing chamber 32 in which the ring sealing element 31 lies pressed through the sealing press surface 13.

If now, as shown in FIG. 1, the interconnected jacking pipes 1, 2 and 3 are driven further through the hole created by the auger 58, within the existing locking sleeves in particular the mutually adjacent sliding end faces 14 'and 25 absorb the jacking forces. Because the system recesses 15, 19, 22, 29 are compatible with one another, they also absorb propulsive forces. This ensures that when driving the

Jacking pipes the forces are transmitted so that no relative movement of the jacking pipes 1, 2, 3 m of the Verπege- sleeve is possible. Pulling apart of the jacking pipes is also prevented by the sliding block 26 pressed in the sliding recess 28. Damage to the ring sealing element 31 is hereby excluded. The pressing of the ring sealing element 31 in the sealing chamber 32 also ensures an improvement in the liquid-tight connection of the jacking pipes 1, 2, 3 to one another.

FIGS. 4 and 5 show a second embodiment of an insertion end and a spike end of two jacking pipes 61 and 62 to be connected to one another.

The jacking tube 61 has an insertion end 71 and the jacking tube 62 has a spigot end 80 with an annular sealing element 91. The spigot end and spigot end both have two mutually compatible contact recesses 75, 79 and 82, 89 and form a locking sleeve in the assembled state.

The first insertion contact recess 75 forms a radial shoulder, which starts from an inner wall 310 of the jacking pipe 71. It forms a fillet at the angle point. An at least partially circumferential sliding block 74 is arranged on it and carries a sliding surface 76.

The second insertion contact recess 19 adjoining the first insertion contact recess 15 is delimited by a sliding end face 74 'of the sliding block 74 and a sealing press surface 73. It also has a fillet at the angle point. The sealing press surface 73 merges via a bevel 73.1 inclined by 30 ° into a stop surface 72 lying at right angles to it. The first tip-end contact recess 82 forms a radial closure of an outer wall 410 of the jacking pipe 62. It is delimited by a stop surface 82 'and a receiving surface 83, which have a fillet between them. A sealing receiving groove 90 is introduced into the receiving surface 82. It has a rectangular cross section. A round sealing ring 91 is inserted into the seal receiving groove 90.

The tip end contact recess 89 has a sliding surface 86, into which a sliding recess 88 with an anchoring surface 87 is made. The sliding surface 86 is thus subdivided in front of the sliding recess 88 into a sliding plane 86.2 which merges into a sliding bevel 86.1 inclined by a sliding angle. The glide angle is about 20 °.

The jacking pipes 61, 62 are made of plastic and have a wall thickness that is appropriate for the respective pipe diameter. The laying of the jacking pipes 61, 62 is similar to the laying of the jacking pipes 1, 2, ....

Pushing the insertion end 71 onto the opposite tip end 20 is facilitated by the bevel 73.1 of the sealing press surface 73, since this meets the slide bevel 86.1 when the pipe ends are canted. Both slopes ensure that the free end of the tip end of the insertion end 11 can be received in the correct position.

When the insertion end is pushed further onto the pointed end and vice versa, the sliding block 74 with the rounded end of its sliding plane 76 is pushed onto the sliding bevel 86.1. The elasticity of the tube material enables the sliding block 74 with its sliding surface 76 to be pressed onto the sliding slope 86.2. In this case, the receiving surface 83.1 is raised so far that it is above the tion receiving groove 90 inserted sealing element 91 is. If pushed further, the ring sealing element is not damaged; the receiving surface 83.1 slides over it without pushing it out of the sealing receiving groove 90. The bevel 73.1 present on the sealing press surface 73 facilitates the corresponding deformation of the ring sealing element 91.

If the insertion end 71 or the pointed end 80 is shifted further, the sliding block 74 slides into the sliding recess 88. The sliding end face 74 'rests on the sliding end face 85 and prevents the two jacking pipes from being pushed further into one another.

Due to the elasticity of the pipe material, the sealing press surface 73 lies flush on the receiving surface 83 and forms with the seal receiving groove 90 a sealing chamber 92 in which the sealing ring 91 is pressed. The compression of the sealing ring 91 in the sealing chamber 92 ensures the high tightness of the locking sleeve formed in this way. The sliding block 74 anchored in the sliding recess 88 ensures that the two jacking pipes 61, 62 are locked together.

The adjoining sliding end faces 74 ', 85 ensure that the two jacking pipes 61, 62 can be advanced in a pipe assembly so that there is no damage and impairment of the liquid-tight

Connection that is ensured by the ring sealing element 91 comes. The absorption of the driving forces to be applied is supported in that the stop surface 72 lies against the stop surface 82 'and the stop surface 89' lies against the free surface of the plug-in contact recess 75. The jacking pipes 61, 62 are also pulled apart is effectively prevented in particular by the sliding block 74 anchored in the sliding recess 88.

FIGS. 6 and 7 show details of a further locking device for connecting two jacking pipes 101 and 102. In the area of the lock, each jacking pipe, like jacking pipe 101 here, has an insertion end 111; the associated counterpart, the jacking pipe 102, has a compatible tip end 120. The plug-in and the tip end of each jacking pipe 101, 102 are arranged at their opposite ends.

Arranged in the insertion and on the tip end 111, 120 are two consecutive, mutually compatible, substantially L-shaped contact recesses 115, 119 and 122, 129, namely a first and second insertion contact recess 115, 119 am Inserting end and a first and second tip end contact recess 122, 119 at the tip end.

The insertion system recess 119 is L-shaped from an inner wall 210 of the jacking pipe 10. It is slightly rounded at the angle point to form a fillet. A circumferential anchoring recess 118 is made in it, which has an essentially rectangular cross section. Towards the insertion end, a sliding block 114 adjoins the anchoring recess 118 and has an essentially desk-like cross section. Its slanted sliding plane 116 is used to drive onto a compatible sliding plane 126 of the tip end.

A second insertion contact recess 115 adjoins the first insertion contact recess 119 in the direction of the insertion end. It is also L-shaped and lies further outside than the first insertion contact recess 119. It is delimited by the sliding block 114. A second surface of the insertion contact recess 115 is referred to as a sealing press surface 113. This merges at right angles into a radially extending stop surface 112. The transition from the sealing press surface 113 to the stop surface 112 is rounded by a fillet.

Compatible elements are provided at the tip end 120. Starting from an outer wall, the first tip end contact recess 122 is delimited by a contact surface 122 'and a receiving surface 123. In the corner corner, the tip end stop recess 122 is rounded by a groove. A sealing receiving groove 130 with a rectangular cross section is introduced into its receiving surface 123. A sealing ring 31 is inserted here.

The second tip end contact recess 129 is through a

Anchoring block 124 and a stop surface 129 'limited. The anchor block 124 projects outwardly and has the sliding surface 126, which ge in an inclined by about 45 ° Gleitschrä ^¬ 126.1 and an adjoining sliding plane 126.2 is divided into two parts. The sliding plane 126.2 merges into a radially directed anchoring surface 127.

As shown in FIG. 6, when the jacking pipes 101, 102 are not connected, the insertion end 111 and the tip end 120 lie opposite one another. When the tip end 120 is inserted into the insertion end 111, the sliding block 114 moves onto the

Anchoring block 124. In the lower region of its rounded sliding end face 114 ', it rests on the sliding bevel 126.1. Due to the inclination of the sliding bevel, it reaches the sliding plane 126.2 with its sliding plane 116. This upwardly sliding is possible with the corresponding driving force and un ^¬ ter utilizing the elasticity of the material of the propulsion tube. It is essential that in a position of the insertion end 111 in relation to the tip end 120 (cf. FIG. 6), in which the sliding block 114 rests on the anchoring block 124, the sealing press surface 113 is raised so far that it has a sealing ring 131 with a round cross section, which is inserted into the seal receiving groove 130, not only not damaged, but slides over it without pushing it out of the seal receiving groove 130. This sliding over is facilitated by the rounded edge between the stop surface 112 and the sealing press surface 113.

The finished connection of two jacking pipes 101, 102 is shown in FIG. 7. The anchoring block 124 of the insertion end 111 lies in the compatible insertion contact recess 119 of the tip end 102 and the sliding block 114 in the tip end contact recess 129. After the elastic deformation of the insertion end has been removed the sealing press surface 113, which is raised during the establishment of the connection (see FIG. 6), is lowered and lies on the receiving surface 123. The ring sealing element 131, which is supported in the seal receiving groove 130 and which projects above the receiving surface 123 in the undeformed state, is compressed by the sealing pressing surface 113. Due to the restoring force of the permanently elastic ring sealing element 131, a liquid-tight connection is brought about here.

Due to the form-fitting connection of the jacking pipes and the multiple guidance of the nested parts by means of abutting stop and sliding surfaces of the insert and tip ends, external mechanical loads are absorbed and do not act on the ring sealing element and the adjacent sealing press surface, which ensures a permanent liquid-tight connection. Reference symbol list:

1, 2, 3, 4, 61, 62, 101, 102 jacking tube

5 Stack of tunnel tubes 6 Soil 7 Shaft 8 Soil surface 10 Locking sleeve

11, 71, 111 insertion end

12, 72 stop surface

13, 73, 113 sealing press surface

14, 74 sliding block

14 ', 74', 114 'sliding face

15, 75, 115 insertion system recess

16, 76, 116 sliding plane

17 anchoring surface

18, 118 anchoring recess

19, 79, 119 plug-in system recess

20, 80, 120 spiked ends

22, 82, 122 first tip-end recess

22 ', 82', 122 'stop surface

23, 83, 123 recording area

24, 84, 124 anchoring block

25, 85, 125 sliding face

26, 86, 126 sliding surface

26. 1, 86.1 sliding slope

26. 2, 86.2 sliding level

27, 87 anchoring surface

28, 88 sliding recess

29, 89, 129 second tip-end recess

29 ', 89', 129 'stroke pool

30, 90, 130 seal receiving groove

31, 91, 131 ring sealing element , 92, 132 sealing chamber jacking pipe

Laying device Energy center Storage unit Head of pipeline Wheelhouse Central jacking unit Auger lifting tool 0, 310 inner wall 0, 410 outer wall Sliding angle

Claims

claims

1. Jacking pipe (1, 2; 61, 62; 101, 102) made of plastic, which has:

- an inner and an outer wall (110, 210; 310, 410),

- An insertion end (11; 71; 111) and - A pointed end (20; 80, 120) with a circumferential seal receiving groove (30; 90; 130) into which an annular sealing element (31; 91; 131) can be inserted, characterized in that

- That in the insertion and on the tip end (11, 20; 71, 80; 111, 120) two consecutive and mutually compatible, substantially L-shaped contact recesses (15, 19, 22, 29; 75, 79, 82, 89; 115, 119, 122, 129) are arranged,

- Wherein at least one, at least partially circumferential sliding block (14; 74; 114) is arranged in the first, from the inner wall (110; 310) outgoing insertion recess (15; 75; 115) and

- Wherein in the first from the outer wall (210; 410) outgoing end-end recess (22; 82; 122) a seal receiving recess (seal receiving groove 30; 90; 130) and in the second end-end recess (29; 79; 129) a circumferential Sliding recess (28; 88) and an at least partially beveled sliding surface (26; 86; 126) are arranged in front of it.

2. Jacking pipe according to claim 1, characterized in that

- That the sliding block (14; 74; 114) with a sliding plane

(16; 76; 116) is provided and

- That the sliding plane (16; 76; 116) and the sliding surface (26; 86; 126) can be pushed onto each other so that the second insertion system recess (15; 75; 115) with their sealing press surface (13; 73; 113) the ring sealing element (31; 91; 131) can be lifted.

3. Jacking pipe according to claim 2, characterized in that the sliding plane (116) of the sliding block (114) is at least partially chamfered.

4. Jacking pipe according to one of claims 1 to 3, characterized in that the sliding block (14; 74; 114) can be latched into the sliding recess (28; 88; 128) and its sliding end face (14 '; 74'; 114 ') on it Sliding end face (25; 85; 115) can be created.

5. Jacking pipe according to one of claims 1 to 4, characterized in that in the first, from the inner wall (110) outgoing plug-in recess (15) in front of the sliding block (14) has a circumferential anchoring recess (18) and on the second, of a circumferential anchoring block (24), which carries the at least partially bevelled sliding surface (26), is arranged on the outer wall (210) of the first tip-end contact recess (22).

6. Jacking pipe according to one of claims 1 to 5, characterized in that on a receiving surface (23; 83; 123) of the first insertion contact recess (15; 75; 115) into which the seal receiving recess (seal receiving groove 30; 90 ; 130) is inserted, lying sealing press surface (13; 73; 113) of the second tip end Contact recess (19; 79; 129) forms such a sealing chamber (32; 92; 132) that the ring sealing element (31; 91; 131) is pressed into it.

7. jacking pipe according to one of claims 1 to 6, characterized in that the seal receiving recess is designed as a seal receiving groove (30; 90; 130) with a semicircular or rectangular cross section.

8. Jacking pipe according to one of claims 1 to 7, characterized in that the ring sealing element (31; 91; 131) has a round cross section.

9. Jacking pipe according to one of claims 1 to 8, characterized in that the ring sealing element (31; 91; 131) consists of an elastomer, in particular rubber or plastic, and has a Shore A hardness between 50 and 60.

10. Jacking pipe according to one of claims 1 to 9, characterized in that the corners of the stop recesses (15, 19, 22, 29; 75, 79, 82, 89; 115, 119, 122, 129) are at least partially rounded.