Assembly type weak silt layer pipe jacking anti-sinking device

Abstract

The utility model discloses an assembly type weak silt layer pipe jacking anti-sinking device which comprises a support unit and an upward supporting unit which are installed in a pipe joint, the support unit is detachably installed in the pipe joint through a fixing unit, the upward supporting unit is installed on the upper portion of the support unit, and the top of the upward supporting unit supports the inner wall of the pipe joint. The support unit comprises two horizontal transverse supporting pieces and two vertical supporting pieces which are detachably connected end to end, the connected ends of the transverse supporting pieces and the vertical supporting pieces are detachably connected to the same fixing unit, and the whole support unit is rectangular. The device has the advantages that the safety in the pipe jacking starting process is better improved, the problems of pipe joint drifting and pipe jacking machine'kowtow 'are avoided, the probability of safety accidents is reduced, quick installation is achieved in a threaded connection mode, the construction efficiency is improved, and good applicability is achieved; and the device can be detached and reused, and has good economical efficiency. The device is easy and convenient to construct and has good operability.

Description

Technical Field

[0001] The utility model relates to the technical field of trenchless pipeline construction, in particular to a technology for preventing pipe jacking from sinking in a soft silt layer. Background Art

[0002] Pipe jacking is a trenchless pipeline construction technology used in the field of construction for complex geology and many ground structures. It has little impact on the surrounding environment, a small construction site, low noise, and is less affected by natural conditions. The general construction process is to first excavate the starting well for pipe jacking, and then use the pipe jacking machine to excavate. With the help of the thrust of the main jacking cylinder of the jack and the relay room between pipelines, push the tool pipe or pipe jacking machine from the starting well through the soil layer to the receiving well for lifting. During the starting process of pipe jacking (20-30m range), pipe section drift and pipe jacking machine "knock" problems are prone to occur, especially in soft silt layers. Due to the weak bearing capacity of the silt layer or the sudden drop in pressure during the jacking process of the pipe section, the long-term stay during the starting process will cause the pipe jacking and finished pipe to sink. There are generally two preventive measures for this problem. One is continuous jacking, which continuously increases the length of the finished pipe and the jacking machine in the soft silt layer, thereby increasing the contact area in the soft soil layer. The second is to reinforce the soil of the starting section, using cement mixing or high-pressure jet grouting to perform grouting reinforcement on the 3m range on the left and right and up and down of the jacking contour line. However, the first method cannot cope with unexpected stops, and the second method depends on the quality of the reinforcement. In the case of abundant groundwater and insufficient construction experience, it is easy to lead to poor reinforcement effect, which may lead to problems such as pipe segment drift, pipe jacking machine "knocking", and pipe segment sinking. Utility Model Content

[0003] The utility model aims to provide an assembled soft silt layer pipe jacking anti-sinking device to solve the problems of pipe segment drift, pipe jacking machine "knocking" and pipe segment sinking in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An assembled soft silt layer top pipe anti-sinking device comprises a support unit installed in a pipe segment and an upward support unit, wherein the support unit is detachably installed in the pipe segment through a fixing unit, the upward support unit is installed on the upper part of the support unit, and the top of the upward support unit supports the inner wall of the pipe segment;

[0006] The support unit comprises two horizontal transverse supports and two vertical supports which are detachably connected end to end. The ends where the transverse supports and the vertical supports are connected can be detachably connected to the same fixing unit. The support unit is rectangular as a whole.

[0007] Further, the upward supporting unit includes a vertical upward supporting member.

[0008] Furthermore, the upward supporting members are installed at both ends of the transverse supporting member located at the upper part of the support unit, the lower part of the upward supporting member is connected to the transverse supporting member, and the upper part of the upward supporting member is supported on the inner wall of the pipe segment.

[0009] Furthermore, the support units are at least 2 and are spaced apart and distributed along the longitudinal direction of the pipe segment;

[0010] The upward supporting unit comprises an upward supporting member and a longitudinal supporting member, wherein the longitudinal supporting members are at least 2 and are longitudinally connected in sequence to form a whole;

[0011] The longitudinal support member is detachably mounted on the upper part of the transverse support member, the side of the longitudinal support member is closely attached to the side of the upward support member, the top of the longitudinal support member is supported on the inner wall of the pipe section, and the bottom of the longitudinal support member is closely attached to the top of the transverse support member.

[0012] Furthermore, two upward supporting members are installed at both ends of the transverse supporting member, and the lower parts of the two upward supporting members are respectively installed on both sides of the transverse supporting member.

[0013] Furthermore, the transverse support members, the vertical support members, and the longitudinal support members are I-beams.

[0014] The upward supporting member is a channel steel, and the leg portion of the upward supporting member is thicker than the waist portion.

[0015] Furthermore, the fixing unit includes embedded parts and connecting parts.

[0016] The embedded part includes an embedded part and an exposed part, the embedded part is a threaded steel bar embedded in the pipe section, and the exposed part is a thread head, and a connecting nut on the thread head can be detachably connected to the connecting part;

[0017] The embedded part is L-shaped.

[0018] Furthermore, the connecting member includes a bottom plate, a groove plate, and a reinforcing rib.

[0019] There are two groove plates, which are arranged opposite to each other and vertically connected to the bottom plate. The free ends of the groove plates away from the bottom plate are provided with V-shaped grooves, the inner angle of the V-shaped grooves is 90°, and support member connection holes are provided on both sides of the V-shaped grooves of the groove plates;

[0020] The bottom plate is reserved with two embedded parts connection holes, which are respectively located on the areas outside the two groove plates;

[0021] There are four reinforcing ribs, which are respectively located on the outside of both ends of each groove plate. The reinforcing rib is a right-angled triangle, one right-angled side of which is connected to the outside of the groove plate, and the other right-angled side is connected to the bottom plate;

[0022] Furthermore, the embedded part connection hole of the bottom plate is detachably connected to the thread head through a nut, and the bottom plate is closely attached to the inner wall of the pipe segment;

[0023] Both ends of the vertical support member and the transverse support member are provided with a pair of oppositely arranged groove plate connecting holes and a pair of oppositely arranged support member mounting holes arranged along the width direction thereof. The pair of groove plate connecting holes of the vertical support member can be detachably mounted on the support member connecting holes on one side of the V-shaped groove by means of screws and nuts, and the pair of groove plate connecting holes of the transverse support member can be detachably mounted on the support member connecting holes on the other side of the V-shaped groove by means of screws and nuts. The support member mounting holes at one end where the vertical support member and the transverse support member are connected can be detachably connected together by means of screws and nuts, and correspond to the V-shaped groove of the connecting member, the connecting member is at the innermost side, and the two ends of the transverse support member are respectively connected between the connecting member and the two ends of the vertical support member.

[0024] Furthermore, there are two embedded parts for one fixing unit, and the two embedded parts of the same fixing unit can be in the same pipe section, or in adjacent ends of adjacent pipe sections respectively.

[0025] The advantages of the utility model are: better improving the safety during the process of launching the pipe jacking, avoiding the problems of pipe segment drift and pipe jacking machine "knocking", and reducing the probability of safety accidents. Through the setting of embedded parts inside the pipe segment, it can be installed in a screw connection manner, which can be quickly installed, improve construction efficiency, and has good applicability; the anti-sinking device is connected to the pipe segment in an annular and longitudinal direction, the annular connection enhances the integrity of the pipe segment, and the longitudinal connection enhances the connection performance between the pipe segments, so that 3-5 pipe segments are connected as a whole to prevent sinking; it has the characteristics of being recyclable, and the longitudinal support members, transverse support members, vertical support members, screws, nuts, etc. can all be disassembled and reused, and has good economy. The device is easy to construct and has good operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the installation cross-sectional structure of an embodiment of the utility model;

[0028] Figure 2 yes Figure 1 A magnified view of part A;

[0029] Figure 3 This is a schematic diagram of the installation facade structure of an embodiment of the utility model;

[0030] Figure 4 yes Figure 3 A magnified view of part B;

[0031] Figure 5 This is a schematic diagram of the top view of the installation structure of the embodiment of the utility model;

[0032] Figure 6 yes Figure 5 Enlarged view of part C;

[0033] Figure 7 It is a schematic diagram of the front structure of the connector;

[0034] Figure 8 It is a schematic diagram of the side structure of the connecting piece;

[0035] Fig. 9 1. It is a schematic diagram of the top view of the connecting part;

[0036] Fig.10 1 is a schematic diagram of the front view and side view of the transverse support member;

[0037] Fig.11 It is a schematic diagram of the front and side views of the vertical support member.

[0038] Pipe section 1, horizontal support member 2, vertical support member 3, upward support member 4, longitudinal support member 5, embedded member 6, connecting member 7, bottom plate 71, embedded member connecting hole 711, groove plate 72, V-shaped groove 721, support member connecting hole 722, reinforcing rib 73, groove plate connecting hole 8, support member mounting hole 9, nut 10, bolt 11. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0040] The transverse direction mentioned in this specification coincides with the cross-section of the pipe segment, the vertical direction coincides with the vertical direction, and the longitudinal direction coincides with the longitudinal direction of the pipe segment.

[0041] like Figure 1-11 As shown, an assembled soft silt layer top pipe anti-sinking device comprises a support unit and an upward support unit installed in a pipe segment 1, wherein the support unit is detachably installed in the pipe segment 1 through a fixing unit, and the upward support unit is installed on the upper part of the support unit, and the top of the upward support unit supports the inner wall of the pipe segment 1;

[0042] The support unit includes two horizontal transverse support members 2 and two vertical vertical support members 3 which are detachably connected end to end. The ends of the transverse support members 2 and the vertical support members 3 connected to each other can be detachably connected to the same fixing unit. The support unit is rectangular as a whole.

[0043] The upward supporting unit includes a vertical upward supporting member 4 .

[0044] The upward supporting members 4 are installed at both ends of the transverse supporting member 2 located at the upper part of the support unit, the lower part of the upward supporting member 4 is connected to the transverse supporting member 2, and the upper part of the upward supporting member 4 is supported on the inner wall of the pipe segment 1.

[0045] There are no less than 2 support units, which are spaced apart longitudinally along the pipe segment 1;

[0046] The upward supporting unit includes an upward supporting member 4 and a longitudinal supporting member 5. The longitudinal supporting members 5 are at least 2 and are longitudinally connected in sequence to form a whole. The length is determined by the anti-sinking device. The longitudinal supporting members 5 are connected by welding.

[0047] The longitudinal support member 5 is detachably mounted on the upper part of the transverse support member 2 , the side of the longitudinal support member 5 is in close contact with the side of the upward support member 4 , the top of the longitudinal support member 5 is supported on the inner wall of the pipe section 1 , and the bottom of the longitudinal support member 5 is in close contact with the top of the transverse support member 2 .

[0048] Two upward supporting members 4 are installed at both ends of the transverse supporting member 2 , and the lower parts of the two upward supporting members 4 are installed on both sides of the transverse supporting member 2 respectively.

[0049] The transverse support member 2, the vertical support member 3, and the longitudinal support member 5 are I-beams. The transverse support member 2 is made of Q235 steel, with a thickness of 3 cm, specifications of 350×350×12×19 mm, and the length is determined according to the size of the pipe section 1 and the position of the fixed unit. The vertical support member 3 is made of Q235 steel, with a thickness of 3 cm, specifications of 300×305×15×15 mm, and the length is determined according to the size of the pipe section 1 and the position of the fixed unit. The longitudinal support member 5 is made of Q235 steel, with specifications of 200×100×5.5×8 mm.

[0050] The upward support member 4 is a channel steel, the leg of the upward support member 4 is thicker than the waist, the channel steel is made of Q235 steel, the specification is No. 10 channel steel, 100×48×5.3mm, waist thickness is 5.3mm, leg thickness is 8.5mm, and the length is determined according to the size of the pipe section 1 and the position of the transverse support member 2. The channel steel is connected and fixed to the transverse support member 2 by welding.

[0051] The fixing unit includes an embedded part 6 and a connecting part 7.

[0052] The embedded part 6 is made of Q235 steel and includes an embedded part and an exposed part. The embedded part is threaded steel with a length of 25 cm, which is embedded in the pipe section 1. The exposed part is a threaded head with a length of 35 cm and a diameter of 3.5 cm. It has a certain strength and rigidity to ensure the stability of the embedded part 6 in the concrete structure. The connecting nut on the threaded head can be detachably connected to the connecting part 7;

[0053] The embedded part 6 is L-shaped.

[0054] The connecting member 7 has certain strength and rigidity, is made of Q235 steel, has a thickness of 3 cm, and includes a bottom plate 71, a groove plate 72, and a reinforcing rib 73. The bottom plate 71, the reinforcing rib 73, and the groove plate 72 are all connected by welding.

[0055] There are two groove plates 72, which are arranged opposite to each other and vertically connected to the bottom plate 71. The free ends of the groove plates 72 away from the bottom plate 71 are provided with V-shaped grooves 721, and the inner angle of the V-shaped grooves 721 is 90°. Support member connection holes 722 are respectively provided on both sides of the V-shaped grooves 721 of the groove plates 72.

[0056] The bottom plate 71 is reserved with two embedded component connection holes 711, which are respectively located on the areas outside the two groove plates 72;

[0057] There are four reinforcing ribs 73, which are respectively located at the outer sides of both ends of each groove plate 72. The reinforcing rib 73 is a right triangle, one right angle side of which is connected to the outer side of the groove plate 72, and the other right angle side is connected to the bottom plate 71;

[0058] The embedded part connection hole 711 of the bottom plate 71 is detachably connected to the thread head through a nut, and the bottom plate 71 is closely attached to the inner wall of the pipe segment 1;

[0059] Both ends of the vertical support member 3 and the transverse support member 2 are provided with a pair of oppositely arranged groove plate connecting holes 8 and a pair of oppositely arranged support member mounting holes 9 arranged along the width direction thereof. The pair of groove plate connecting holes 8 of the vertical support member 3 are detachably mounted on the support member connecting holes 722 on one side of the V-shaped groove 721 by means of screws and nuts, and the pair of groove plate connecting holes 8 of the transverse support member 2 are detachably mounted on the support member connecting holes 722 on the other side of the V-shaped groove 721 by means of screws and nuts. The support member mounting holes 9 at one end where the vertical support member 3 and the transverse support member 2 are connected are detachably connected together by means of screws and nuts, and correspond to the V-shaped groove of the connecting member 7. The connecting member 7 is at the innermost side, and the two ends of the transverse support member 2 are respectively connected between the connecting member 7 and the two ends of the vertical support member 3.

[0060] There are two embedded parts 6 in one fixing unit. The two embedded parts 6 in the same fixing unit can be in the same pipe section 1 or in adjacent ends of adjacent pipe sections 1 respectively.

[0061] The nuts and screws used in this technical solution are made of high-strength steel. The nut specification is M36, the length is 5.5cm, the thickness is 2.9cm, the screw length is 40cm, and the diameter is 3.5cm. Each component is screwed.

[0062] The construction process of this utility model is as follows:

[0063] The first step is to embed the embedded part 6 in the finished pipe when making the finished pipe, with the embedded threaded steel embedded in the pipe section 1 structure and the exposed thread head outside the structure;

[0064] The second step is to insert the embedded part connection hole 711 of the manufactured connector 7 into the embedded part thread head, and after adjusting the position, use a nut to screw and tighten it on the thread head;

[0065] The third step is to install the vertical support member 3, and use nuts and screws to slightly fix the upper end of the vertical support member 3 and the corresponding connecting member 7, and temporarily not connect the lower end of the vertical support member 3 to the connecting member 7 so that it can rotate without falling;

[0066] The fourth step is to install the transverse support member 2. The size of the transverse support member 2 is smaller than the notch size of the vertical support member 3. First, insert both ends of the transverse support member 2 into the vertical support member 3, and then install it from top to bottom. When installing, first use nuts and screws to connect the transverse I-beam and the connecting member 7, and then connect the transverse I-beam and the vertical I-beam. When installing, do not tighten the nuts and screws first. After the transverse I-beam and the vertical I-beam are installed, they are accurately connected to the connecting member 7 before tightening.

[0067] Step 5: Install the longitudinal support members 5 and weld the longitudinal support members 5 together;

[0068] Step 6: Install the channel steel and weld it to the transverse support 2;

[0069] Step 7: Repeat the above operation to connect 3-5 pipe sections 1 into a whole;

[0070] The eighth step is to push the pipe forward to ensure that the pipe segment 1 does not sink, then remove the anti-sinking device for recovery.

[0071] The advantages of the utility model include:

[0072] The embedded part 6 has sufficient strength and has the function of transmitting force; the embedded part is fixed in the concrete structure, and secondly, the protruding thread head part is connected with the nut to tighten the connecting part 7, which is convenient for subsequent construction and installation; fourthly, after the subsequent anti-sinking device is recovered, it can be cut and removed.

[0073] The connector 7 is a key component of each component, transmitting the force between the pipe segment 1 and the anti-sinking device; the reserved hole is used for screw connection, which is convenient for installation and disassembly; after ensuring that the pipe segment 1 does not sink, the connector 7 can be disassembled and recycled, which has good economic efficiency.

[0074] The embedded parts 6 and the connecting parts 7, the connecting parts 7 and the vertical I-beams, the connecting parts 7 and the transverse I-beams, and the transverse I-beams and the vertical I-beams are connected in multiple places using screw connections, so that the anti-sinking device can form a whole and then transfer the load; after ensuring that the pipe segment 1 does not sink, it can be disassembled and recycled, which has good economy.

[0075] The transverse I-beam is screwed with the connecting piece 7 and the vertical I-beam to enhance the integrity of the device; it serves as a support for the longitudinal I-beam to transfer the load; after ensuring that the pipe segment 1 does not sink, it can be disassembled and recycled, which has good economic efficiency.

[0076] The vertical I-beam is screwed with the connecting piece 7 and the horizontal I-beam to enhance the integrity of the device; a vertical upward reaction force is provided to prevent the pipe segment 1 from sinking; after ensuring that the pipe segment 1 does not sink, it can be disassembled and recycled, which has good economic efficiency.

[0077] The channel steel is welded and fixed to the transverse I-beam, so that the longitudinal I-beam is close to the transverse I-beam and the side wall of the pipe segment 1; the transverse I-beam provides a vertical upward reaction force to prevent the pipe segment 1 from sinking; after ensuring that the pipe segment 1 does not sink, it can be disassembled and recycled, which has good economic efficiency.

[0078] The bottom of the longitudinal I-beam is in close contact with the transverse I-beam, the top supports the inner wall of the pipe segment 1, and the side is in close contact with the channel steel. The transverse I-beam is used as a support to provide a vertical upward reaction force to prevent the pipe segment 1 from sinking. After ensuring that the pipe segment 1 does not sink, it can be disassembled and recycled, which has good economic efficiency.

[0079] The utility model discloses an assembled anti-sinking device for jacking pipes in soft silt layers, which can connect a plurality of pipe sections 1 into a whole, improve the integrity of the jacking pipe, avoid sinking and drifting of the pipe sections 1 in the process of jacking the pipes into the soft silt layers, and ensure the quality and safety of construction; the utility model has strong applicability, and can be applied to jacking pipe sections 1 of different sizes by adjusting the size and length of the horizontal support members 2, the vertical support members 3 and the longitudinal support members 5; the utility model is recyclable, and the I-beams, the connectors 7, the channel steels, the screws and nuts can be disassembled and reused, and has good economy; the utility model can be assembled for construction, the threshold for manufacturing and construction is low, and the installation is fast and convenient, which effectively improves the construction efficiency.

[0080] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An assembled anti-sinking device for jacking pipes in soft silt layers, characterized by: It includes a support unit installed in the pipe section and an upward support unit, wherein the support unit is detachably installed in the pipe section through a fixing unit, and the upward support unit is installed on the upper part of the support unit, and the top of the upward support unit supports the inner wall of the pipe section; The support unit comprises two horizontal transverse supports and two vertical supports which are detachably connected end to end. The ends where the transverse supports and the vertical supports are connected can be detachably connected to the same fixing unit. The support unit is rectangular as a whole.

2. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 1 is characterized by: The upward supporting unit includes a vertical upward supporting member.

3. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 2 is characterized by: The upward supporting members are installed at both ends of the transverse supporting member located at the upper part of the support unit, the lower part of the upward supporting member is connected to the transverse supporting member, and the upper part of the upward supporting member is supported on the inner wall of the pipe segment.

4. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 3 is characterized by: There are no less than 2 support units, which are spaced apart longitudinally along the pipe segment; The upward supporting unit comprises an upward supporting member and a longitudinal supporting member, wherein the longitudinal supporting members are at least 2 and are longitudinally connected in sequence to form a whole; The longitudinal support member is detachably mounted on the upper part of the transverse support member, the side of the longitudinal support member is closely attached to the side of the upward support member, the top of the longitudinal support member is supported on the inner wall of the pipe section, and the bottom of the longitudinal support member is closely attached to the top of the transverse support member.

5. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 3 is characterized by: Two upward supporting members are installed at both ends of the transverse supporting member, and the lower parts of the two upward supporting members are respectively installed on both sides of the transverse supporting member.

6. The assembled anti-sinking device for jacking pipes in soft mud layers according to claim 5 is characterized by: The horizontal support members, vertical support members and longitudinal support members are I-beams. The upward supporting member is a channel steel, and the leg portion of the upward supporting member is thicker than the waist portion.

7. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 1 is characterized by: The fixing unit includes embedded parts and connecting parts. The embedded part includes an embedded part and an exposed part, the embedded part is a threaded steel bar embedded in the pipe section, and the exposed part is a thread head, and a connecting nut on the thread head can be detachably connected to the connecting part; The embedded part is L-shaped.

8. The assembled anti-sinking device for jacking pipes in soft silt layers according to claim 7 is characterized by: The connecting member includes a bottom plate, a groove plate, and a reinforcing rib. There are two groove plates, which are arranged opposite to each other and vertically connected to the bottom plate. The free ends of the groove plates away from the bottom plate are provided with V-shaped grooves, the inner angle of the V-shaped grooves is 90°, and support member connection holes are provided on both sides of the V-shaped grooves of the groove plates; The bottom plate is reserved with two embedded parts connection holes, which are respectively located on the areas outside the two groove plates; There are four reinforcing ribs, which are respectively located on the outside of both ends of each groove plate. The reinforcing rib is a right-angled triangle, one right-angled side of which is connected to the outside of the groove plate, and the other right-angled side is connected to the bottom plate.

9. The assembled anti-sinking device for jacking pipes in soft mud layers according to claim 8 is characterized by: The embedded part connection hole of the bottom plate is detachably connected to the thread head through a nut, and the bottom plate is closely attached to the inner wall of the pipe segment; Both ends of the vertical support member and the transverse support member are provided with a pair of oppositely arranged groove plate connecting holes and a pair of oppositely arranged support member mounting holes arranged along the width direction thereof. The pair of groove plate connecting holes of the vertical support member can be detachably mounted on the support member connecting holes on one side of the V-shaped groove by means of screws and nuts, and the pair of groove plate connecting holes of the transverse support member can be detachably mounted on the support member connecting holes on the other side of the V-shaped groove by means of screws and nuts. The support member mounting holes at one end where the vertical support member and the transverse support member are connected can be detachably connected together by means of screws and nuts, and correspond to the V-shaped groove of the connecting member, the connecting member is at the innermost side, and the two ends of the transverse support member are respectively connected between the connecting member and the two ends of the vertical support member.

10. The assembled anti-sinking device for jacking pipes in soft mud layers according to claim 8, characterized in that: There are two embedded parts in one fixing unit, and the two embedded parts of the same fixing unit are in the same pipe section or in adjacent ends of adjacent pipe sections respectively.

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