CN221034400U

CN221034400U - PCCP pipeline joint structure

Info

Publication number: CN221034400U
Application number: CN202322555248.1U
Authority: CN
Inventors: 章玉泉; 叶聪; 王顺德; 徐优; 周承瑶; 罗海峰; 何子睿; 郑淑文
Original assignee: Gezhouba Group Ecological Environmental Protection Co ltd
Current assignee: Gezhouba Group Ecological Environmental Protection Co ltd
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2024-05-28
Anticipated expiration: 2033-09-20

Abstract

The utility model discloses a PCCP pipeline joint structure, which comprises a first pipe section and a second pipe section which are installed in a matched manner, wherein a socket steel ring of the first pipe section is inserted into a socket steel ring of the second pipe section, so that a gap is reserved between the ends of the first pipe section and the second pipe section; the seam outside the socket steel ring is filled with a closed-cell plastic plate and cement mortar to form a closed-cell plastic plate ring layer and a cement mortar ring layer, and the cement mortar ring layer is arranged on the outer side of the closed-cell plastic plate ring layer; and the joints inside the bell mouth steel rings are filled with polysulfide sealant to form polysulfide sealant ring layers. The closed-pore plastic plate is filled in the outer joint, and the polysulfide seal is filled in the inner joint to form a flexible joint, so that the flexible joint has good flexibility, can bear certain stress concentration at the joint caused by uneven settlement of the foundation, and effectively reduces the occurrence of water leakage caused by joint breakage.

Description

PCCP pipeline joint structure

Technical Field

The utility model relates to the technical field of PCCP (prestressed concrete cylinder pipe) installation, in particular to a PCCP pipeline joint structure.

Background

The prestressed steel cylinder concrete pipe (PRESTRESSED CONCRETE CYLINDERPIPE, abbreviated as PCCP) is a water pipe which is made by winding circumferential prestressed steel wires on a high-strength concrete pipe core with a steel cylinder and spraying a compact cement mortar protection layer on the steel wire, and is a composite pipe formed by a thin steel plate, the high-strength steel wires and concrete, and has excellent performance.

For a common straight pipe section, a common method for pipeline joints is a rigid joint, the construction is convenient and quick, as the specification of Chinese patent No. CN205534685U discloses a PCCP pipe joint sealing structure, and gaps between the inner layer and the outer layer are sealed by adopting a concrete-like anti-corrosion layer to form the rigid joint; however, in actual use, due to factors such as foundation settlement and the like, the corrosion-resistant layer is likely to be broken, and the risk of water leakage at the interface is high.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a PCCP pipeline joint structure, wherein flexible materials are filled in gaps between the inner layer and the outer layer for blocking, so that a flexible joint is formed, the joint structure can bear certain stress concentration at the joint caused by uneven settlement of a foundation, and the occurrence of water leakage phenomenon caused by joint breakage is effectively reduced.

In order to solve the technical problems, the PCCP pipeline joint structure comprises a first pipe section and a second pipe section which are installed in a matched mode;

The first pipe section comprises a first protection layer, a first prestressed steel wire layer, a first outer concrete layer, a first steel cylinder layer and a first inner concrete layer which are sequentially arranged from outside to inside; the socket end face of the first steel cylinder layer is positioned on the inner side of the socket end face of the first protection layer, the socket end face of the first inner concrete layer is positioned on the outer side of the socket end face of the first protection layer, a socket steel ring is arranged on the outer side face of the socket end of the first inner concrete layer, and the inner end of the socket steel ring is fixedly connected with the socket end of the first steel cylinder layer;

the second pipe section comprises a second protective layer, a second prestressed steel wire layer, a second outer concrete layer, a second steel cylinder layer and a second inner concrete layer which are sequentially arranged from outside to inside; the second protection layer, the second prestressed steel wire layer and the bell end face of the second outer concrete layer are flush, the bell end face of the second steel cylinder layer and the bell end face of the second inner concrete layer are both positioned on the inner side of the bell end face of the second protection layer, a bell steel ring is arranged on the inner side face of the bell end of the second outer concrete layer, and the inner end of the bell steel ring is fixedly connected with the socket end of the second steel cylinder layer;

The spigot steel ring of the first pipe section is inserted into the socket steel ring of the second pipe section, so that a gap is reserved between the ends of the first pipe section and the second pipe section and between the surfaces; a seam outside the socket steel ring is filled with a closed-cell plastic plate and cement mortar to form a closed-cell plastic plate ring layer and a cement mortar ring layer, and the cement mortar ring layer is arranged on the outer side of the closed-cell plastic plate ring layer; and polysulfide sealant is filled in the joint inside the bell mouth steel ring to form a polysulfide sealant ring layer.

In the PCCP pipeline joint structure, the closed-pore plastic plate is filled in the outer joint to form the closed-pore plastic plate annular layer, and the polysulfide sealant is filled in the inner joint to form the polysulfide sealant annular layer, so that the first pipe section and the second pipe section which are matched and installed form a flexible joint, the flexible joint has good flexibility, can bear certain stress concentration at the joint caused by uneven settlement of a foundation, and effectively reduces the occurrence of water leakage phenomenon caused by joint breakage. In addition, a cement mortar ring layer is arranged on the outer side of the closed hole plastic plate ring layer to perform grouting sealing protection on an external joint.

Further, a first annular groove is coaxially arranged on the outer side face of the socket steel ring, and a sealing rubber ring is arranged in the first annular groove and used for sealing a gap between the outer side face of the socket steel ring and the inner side face of the bell steel ring.

Further, the outer side face end part of the socket steel ring is provided with a step notch, a first column section and a second column section are formed from outside to inside, the outer circle diameter of the first column section is smaller than that of the second column section, and a sealing rubber ring is arranged on the second column section.

Furthermore, the inner side surface of the socket steel ring is coaxially provided with a convex ring block, and the convex ring block is sleeved on the outer side of the first column section and axially extrudes and compresses the sealing rubber ring on the second column section.

Through protruding ring piece and second column section cooperation, insert the installation in the bellmouth steel ring in the socket steel ring after, can follow the sealed rubber ring on the bellmouth steel ring axial extrusion second column section, follow the tip of socket steel ring seals, improves sealed effect between socket steel ring and the bellmouth steel ring.

Further, the diameter of the inner hole of the convex ring block is not smaller than the diameter of the outer circle of the first column section, and is not larger than the diameter of the outer circle of the second column section.

Further, the axial width of the convex ring block is equal to the width of the first column section, and one end face of the convex ring block is aligned with the end face of the socket steel ring. After the socket steel ring is inserted into the bell steel ring to be in place, one end face of the convex ring block can be just aligned with the end face of the first column section, so that the operation of the movable pipe section in the process of installing the pipe section can be controlled by observing the relative position of the convex ring block and the first column section in the process of construction, and the operation is more convenient.

Further, the thickness of the cement mortar ring layer is 18-25 mm.

Further, an anti-corrosion coating layer is sprayed on the outer side face of the cement mortar ring layer.

In summary, by adopting the PCCP pipeline joint structure, the water leakage phenomenon caused by joint breakage can be effectively reduced, and the socket steel ring and the bell mouth steel ring are sealed from the side surface and the end surface, so that the sealing effect is reliable.

Drawings

In the drawings:

fig. 1 is a cross-sectional view of a PCCP pipe joint structure of the present utility model.

FIG. 2 is an enlarged view of a portion of FIG. 1

Reference numerals illustrate: 1. a first pipe section; 11. a first protective layer; 12. a first pre-stressed steel wire layer; 13. a first outer concrete layer; 14. a first steel cylinder layer; 15. a first inner concrete layer; 16. a socket steel ring; 161. a first annular groove; 162. a first column section; 163. a second column section; 2. a second pipe section; 21. a second protective layer; 22. a second pre-stressed steel wire layer; 23. a second outer concrete layer; 24. a second steel cylinder layer; 25. a second inner concrete layer; 26. a socket steel ring; 261. a convex ring block; 3. a closed cell plastic sheet hoop layer; 4. a cement mortar ring layer; 5. and a polysulfide sealant ring layer.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model.

Fig. 1 and 2 illustrate a PCCP pipe joint structure of the present utility model. As shown in fig. 1, the PCCP pipe joint structure includes a first pipe section 1 and a second pipe section 2 that are fitted together.

The first pipe section 1 comprises a first protective layer 11, a first prestressed steel wire layer 12, a first outer concrete layer 13, a first steel cylinder layer 14 and a first inner concrete layer 15 which are sequentially arranged from outside to inside; the socket end faces of the first protection layer 11, the first prestressed steel wire layer 12 and the first outer concrete layer 13 are flush, the socket end face of the first steel cylinder layer 14 is located on the inner side of the socket end face of the first protection layer 11, the socket end face of the first inner concrete layer 15 is located on the outer side of the socket end face of the first protection layer 11, a socket steel ring 16 is arranged on the outer side face of the socket end of the first inner concrete layer 15, and the inner end of the socket steel ring 16 is fixedly connected with the socket end of the first steel cylinder layer 14.

The second pipe section 2 comprises a second protective layer 21, a second prestressed steel wire layer 22, a second outer concrete layer 23, a second steel cylinder layer 24 and a second inner concrete layer 25 which are sequentially arranged from outside to inside; the bell end faces of the second protection layer 21, the second prestressed steel wire layer 22 and the second outer concrete layer 23 are flush, the bell end face of the second steel cylinder layer 24 and the bell end face of the second inner concrete layer 25 are located on the inner side of the bell end face of the second protection layer 21, a bell steel ring 26 is arranged on the inner side face of the bell end of the second outer concrete layer 23, and the inner end of the bell steel ring 26 is fixedly connected with the socket end of the second steel cylinder layer 24.

The spigot steel ring 16 of the first pipe section 1 is inserted into the socket steel ring 26 of the second pipe section 2, so that a gap is reserved between the ends of the first pipe section 1 and the second pipe section 2; the seam outside the socket steel ring 16 is filled with a closed-cell plastic plate and cement mortar to form a closed-cell plastic plate annular layer 3 and a cement mortar annular layer 4, and the cement mortar annular layer 4 is arranged on the outer side of the closed-cell plastic plate annular layer 3; the joints inside the bell mouth steel rings 26 are filled with polysulfide sealant to form the polysulfide sealant ring layer 5.

Alternatively, the thickness of the cement mortar ring layer 4 is 18-25 mm.

Optionally, an anti-corrosion paint layer is sprayed on the outer side surface of the cement mortar ring layer 4.

During construction, the external joint is filled, the joint is strictly cleaned, and then a closed-pore plastic plate is filled, wherein the width of the closed-pore plastic plate is equal to the width of the joint, and the height of the closed-pore plastic plate is 20mm smaller than the corresponding joint depth; then carrying out taping and grouting: ① Spraying water on the side surface of the external joint so as to ensure that the surface of the gap is completely wet; ② Wrapping a layer of needled membrane tape cloth on the outer side of the outer joint, taking the needled membrane tape cloth as a grouting outer mold, taking care of wrapping and fastening, and only leaving a grouting opening on the uppermost surface; ③ Cement mortar is poured in, and the cement mortar has better fluidity so as to be uniform, compact and void-free. After the mortar is filled, the grouting opening is filled with dry and hard mortar for trowelling; finally, after the mortar in the grouting protecting band reaches the design strength, the grouting protecting band is dismantled, and the anticorrosive coating is sprayed on site, wherein epoxy coal tar pitch can be adopted for at least two spraying processes.

For filling the inner joint, the process is carried out at a proper time after the pipeline is backfilled, so that the deformation of the pipeline and the surrounding is basically stable, and the inner joint of the pipeline is cleaned firstly during filling, so that no foreign matters and dust are generated in the joint; and then filling polysulfide sealant in the inner joint, and tamping and trowelling.

In addition, after the inner and outer joints are filled, the outer surface of the whole pipeline can be coated with black solvent-free epoxy coal tar pitch anticorrosive paint to form an anticorrosive paint layer; the inner surface may be preserved using hand-scraped polyurea.

Optionally, a first annular groove 161 is coaxially arranged on the outer side surface of the socket steel ring 16, and a sealing rubber ring is arranged in the first annular groove 161 and is used for sealing a gap between the outer side surface of the socket steel ring 16 and the inner side surface of the socket steel ring 26.

Optionally, as shown in fig. 2, a step notch is formed at an end of an outer side surface of the socket steel ring 16, a first column section 162 and a second column section 163 are formed from outside to inside, an outer circle diameter of the first column section 162 is smaller than an outer circle diameter of the second column section 163, and a sealing rubber ring is arranged on the second column section 163.

Optionally, a convex ring block 261 is coaxially arranged on the inner side surface of the socket steel ring 26, and the convex ring block 261 is sleeved on the outer side of the first column section 162 and axially presses and compresses the sealing rubber ring on the second column section 163.

Because the socket steel ring 16 and the bell steel ring 26 have certain ovality, and in actual use, the extrusion force applied to the periphery of the sealing rubber ring in the first annular groove 161 can be different due to the fluctuation of water flow pressure and the gravity influence of the pipe, namely, the compression amounts at different positions are different, so that the risk of water leakage at the joint gap is greatly increased.

Therefore, after the socket steel ring 16 is inserted into the bell steel ring 26 through the matching of the convex ring block 261 and the second column section 163, the sealing rubber ring on the second column section 163 can be axially extruded along the bell steel ring 26, and the sealing effect between the socket steel ring 16 and the bell steel ring 26 is improved by sealing from the end part of the socket steel ring 16.

Alternatively, the inner bore diameter of collar block 261 is no less than the outer diameter of first leg 162 and no greater than the outer diameter of second leg 163.

Alternatively, the collar block 261 has an axial width equal to the width of the first post segment 162 and an end face of the collar block 261 is aligned with an end face of the socket steel ring 16. After the socket steel ring 16 is inserted into the socket steel ring 26 in place, one end face of the convex ring block 261 can be just aligned with the end face of the first column segment 162, visual position information is provided, and therefore the relative positions of the convex ring block 261 and the first column segment 162 can be observed during construction, the operation of moving pipe sections during pipe section installation can be controlled, and the installation operation is more convenient. In addition, during installation of the mobile pipe segment, wood blocks are typically pre-positioned within the external and/or internal seams, without the use of single wire raised ring blocks 261 to transitionally squeeze the sealing rubber ring.

Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical aspects of the present utility model and not for limiting the scope thereof, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the present utility model after reading the present utility model, and these changes, modifications or equivalents are within the scope of the utility model as defined in the appended claims.

Claims

1. A PCCP pipe joint structure characterized by comprising a first pipe section (1) and a second pipe section (2) fitted together;

The first pipe section (1) comprises a first protective layer (11), a first prestressed steel wire layer (12), a first outer concrete layer (13), a first steel cylinder layer (14) and a first inner concrete layer (15) which are sequentially arranged from outside to inside; the socket end faces of the first protection layer (11), the first prestressed steel wire layer (12) and the first outer concrete layer (13) are flush, the socket end face of the first steel cylinder layer (14) is located on the inner side of the socket end face of the first protection layer (11), the socket end face of the first inner concrete layer (15) is located on the outer side of the socket end face of the first protection layer (11), a socket steel ring (16) is arranged on the outer side face of the socket end of the first inner concrete layer (15), and the inner end of the socket steel ring (16) is fixedly connected with the socket end of the first steel cylinder layer (14);

The second pipe section (2) comprises a second protective layer (21), a second prestressed steel wire layer (22), a second outer concrete layer (23), a second steel cylinder layer (24) and a second inner concrete layer (25) which are sequentially arranged from outside to inside; the second protection layer (21), the second prestressed steel wire layer (22) and the bell end face of the second outer concrete layer (23) are flush, the bell end face of the second steel cylinder layer (24) and the bell end face of the second inner concrete layer (25) are both positioned on the inner side of the bell end face of the second protection layer (21), a bell steel ring (26) is arranged on the inner side of the bell end of the second outer concrete layer (23), and the inner end of the bell steel ring (26) is fixedly connected with the socket end of the second steel cylinder layer (24);

The socket steel ring (16) of the first pipe section (1) is inserted into the socket steel ring (26) of the second pipe section (2), so that a gap is reserved between the end surfaces of the first pipe section (1) and the second pipe section (2); the seam outside the socket steel ring (16) is filled with a closed-cell plastic plate and cement mortar to form a closed-cell plastic plate ring layer (3) and a cement mortar ring layer (4), and the cement mortar ring layer (4) is arranged on the outer side of the closed-cell plastic plate ring layer (3); and the joints inside the bell mouth steel rings (26) are filled with polysulfide sealant to form polysulfide sealant ring layers (5).

2. The PCCP pipe joint structure according to claim 1, characterized in that a first annular groove (161) is coaxially provided on the outer side surface of the socket steel ring (16), and a sealing rubber ring is provided in the first annular groove (161) for sealing a gap between the outer side surface of the socket steel ring (16) and the inner side surface of the socket steel ring (26).

3. The PCCP pipe joint structure of claim 1, wherein a stepped notch is provided at an outer side end of the socket steel ring (16), a first column section (162) and a second column section (163) are formed from outside to inside, an outer diameter of the first column section (162) is smaller than an outer diameter of the second column section (163), and a sealing rubber ring is provided on the second column section (163).

4. A PCCP pipe joint structure as defined in claim 3, wherein a collar block (261) is coaxially disposed on the inner side surface of the socket steel ring (26), the collar block (261) is sleeved on the outer side of the first column section (162), and the sealing rubber ring on the second column section (163) is compressed by being axially extruded.

5. The PCCP pipe joint structure according to claim 4, wherein the inner hole diameter of the boss block (261) is not smaller than the outer circle diameter of the first column section (162) and not larger than the outer circle diameter of the second column section (163).

6. The PCCP pipe joint structure according to claim 4, characterized in that the axial width of the collar block (261) is equal to the width of the first column segment (162), and an end face of the collar block (261) is aligned with an end face of the socket steel ring (16).

7. A PCCP pipe joint structure according to claim 1, characterized in that the thickness of the cement mortar ring layer (4) is 18-25 mm.

8. The PCCP pipe joint structure of claim 1, wherein the outer side surface of the cement mortar ring layer (4) is sprayed with an anti-corrosion paint layer.