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CN-122013867-A - Flexible compensation structure of socket joint of nodular cast iron pipe and groove backfilling method of flexible compensation structure

CN122013867ACN 122013867 ACN122013867 ACN 122013867ACN-122013867-A

Abstract

The invention provides a flexible compensation structure of a socket joint of a nodular cast iron pipe and a groove backfilling method thereof, relating to the technical field of construction of rain sewage pipelines, comprising a plurality of pipe bodies connected end to end, wherein one end of each pipe body is a socket, and the other end of each pipe body is a socket; the compensating structure comprises a mounting ring, a supporting ring and a plurality of guide members, wherein the mounting ring is arranged in the bell mouth, the supporting ring is movably arranged in the mounting ring through a plurality of elastic members, the guide members are arranged at equal intervals around the circumferential inner wall of the bell mouth, and the sealing ring is arranged at the periphery of the faucet. The invention has the beneficial effects that the technical problems that the coaxiality requirement of the traditional nodular cast iron pipe socket connection is harsh, the sealing ring is easy to twist and lose efficacy and the differential settlement adaptability is poor are fundamentally solved through the synergistic effect of the elastic floating structure of the socket embedded mounting ring and the supporting ring, the circumferentially uniform elastic guide members and the staged backfilling process.

Inventors

  • Shang Guoyong
  • GAO MIAO
  • WU PIN
  • XIE LEI

Assignees

  • 武汉誉城千里建工有限公司

Dates

Publication Date
20260512
Application Date
20260128

Claims (10)

  1. 1. A flexible compensation structure of a socket joint of a ductile cast iron pipe, comprising: A plurality of pipe bodies (1) which are connected end to end, wherein one end of each pipe body is provided with a socket (101), and the other end is provided with a bellmouth (102); the compensating structure comprises a mounting ring (2), a supporting ring (4) and a plurality of guide pieces (8), wherein the mounting ring (2) is arranged in the socket (102), the supporting ring (4) is movably arranged in the mounting ring (2) through a plurality of elastic pieces (7), and the guide pieces (8) are arranged at equal intervals around the circumferential inner wall of the socket (102); The sealing ring (9) is arranged on the periphery of the inserting opening (101), and when the inserting opening (101) of one pipe body (1) passes through the socket (102) of the other pipe body (1), the inserting opening (101) passes through the supporting ring (4) and can keep coaxiality with the pipe body (1) under the elastic extrusion of a plurality of guide pieces (8).
  2. 2. The flexible compensation structure of the socket joint of the nodular cast iron pipe according to claim 1, wherein the socket (102) comprises a conical outer expansion section and a cylindrical guide section, and the outer wall of the mounting ring (2) is attached to the inner wall of the cylindrical guide section.
  3. 3. The flexible compensation structure of a socket joint of a ductile cast iron pipe according to claim 1, wherein each guide member (8) is a bent steel plate, has elasticity, is oriented to the axis of the socket (102) along the length direction, one end of each guide member (8) is welded to the inner wall of the mounting ring (2), and one end of each guide member (8) far away from the mounting ring (2) is surrounded into a circle with the same inner diameter as the pipe body (1).
  4. 4. The flexible compensation structure of the socket and spigot joint of the nodular cast iron pipe according to claim 1, wherein a limiting ring (3) is arranged at one end of the mounting ring (2), the supporting ring (4) is attached to the limiting ring (3), a plurality of stop blocks (5) are arranged on the inner wall of the mounting ring (2), and one side surface, far away from the limiting ring (3), of the supporting ring (4) is in sliding contact with the plurality of stop blocks (5).
  5. 5. The flexible compensation structure of the socket and spigot joint of the nodular cast iron pipe according to claim 1, wherein a plurality of mounting seats (6) are uniformly arranged on the circumferential outer wall of the supporting ring (4), and each elastic piece (7) is abutted between the supporting ring (4) and the inner wall of the mounting ring (2) corresponding to one mounting seat (6).
  6. 6. The flexible compensation structure of the socket and spigot joint of the nodular cast iron pipe, as set forth in claim 4, is characterized in that the diameter of the middle through hole of the limiting ring (3) is larger than the outer diameter of the spigot (101) but smaller than the outer diameter of the supporting ring (4).
  7. 7. A groove backfilling method of a socket joint of a ductile cast iron pipe, which adopts the flexible compensation structure of the socket joint of the ductile cast iron pipe according to claims 1-6, and is characterized by comprising the following steps: S1, inserting a socket (101) of a pipe body (1) into a bell mouth (102) with the axis deviation less than or equal to 5 degrees, enabling the socket (101) to pass through a supporting ring (4) under the elastic guiding action of a guiding piece (8), enabling a sealing ring (9) to enter the bell mouth (102) along with the socket (101) and contact with the inner wall of the pipe body (1) to form initial sealing, and enabling an elastic piece (7) to be compressed in a self-adaptive mode according to the eccentric amount of the socket (101) at the moment, so that the interface is allowed to be connected in an initial mode under the deflection state; S2, lateral backfilling is not carried out on two sides of the interface, a middle coarse sand cushion layer with the thickness of H=0.5-0.8 times of pipe diameter and the compactness of more than or equal to 90% is paved at the bottom of the groove along the pipe axis direction, so that the bell mouth (102) and the spigot (101) are in free states capable of axially jogging and radially floating on the cushion layer, the floating centering state is kept for 12-24 hours, and the restoration force of the elastic piece (7) and the elastic extrusion force of the guide piece (8) are utilized to cooperatively act to drive the spigot (101) to automatically correct until the axial deviation is less than or equal to 2mm; s3, after the interface is automatically aligned, medium coarse sand is symmetrically and hierarchically backfilled on the medium coarse sand cushion layers at two sides of the socket (102) and is compacted layer by layer, the thickness of each layer is 200-300mm, lateral limit is formed when backfilling to the central elevation of the pipe, the coaxiality of the interface is monitored in real time by using a laser level instrument or a total station instrument in the backfilling process, and when coaxiality deviation is detected to be more than 2mm, dynamic correction is carried out by adjusting the backfilling height difference at two sides; And S4, continuously filling coarse sand to 500mm above the top of the bell mouth (102) in layered backfilling, filling and secondarily sealing the gap between the bell mouth (102) and the spigot (101) in the compaction process, then entering the gap left by the secondary sealing structure filled in the bell mouth (102) through backfilling materials, locking the final coaxiality of the interface, fixing the relative positions of the support ring (4) and the inner wall of the bell mouth (102) under the constraint of backfilling around, and finally realizing the long-term stability of the sealing performance and coaxiality of the interface, wherein the design compression rate of the sealing ring (9) is 25+/-3%.
  8. 8. The method for backfilling grooves of a socket joint of a ductile cast iron pipe according to claim 7, wherein in the step S3, the layered backfilling compaction is performed by using a vibrating plate compactor, the tamping frequency is 60-80Hz, and the horizontal distance between each side of the backfilling compaction working surface and the central line of the joint is always symmetrical.
  9. 9. The method for backfilling grooves of a socket joint of a ductile cast iron pipe according to claim 7, wherein the dynamic correction in the step S3 specifically comprises stopping backfilling at one side deviated by the socket (102) when the coaxiality deviation is detected to be more than 2mm, increasing the backfilling height at the opposite side by 100-150mm, correcting by using the side thrust generated by the pressure difference of backfilling soil at the two sides, and continuing symmetric backfilling after correcting, wherein the coaxiality deviation is less than or equal to 1.5 mm.
  10. 10. The groove backfilling method of the socket joint of the nodular cast iron pipe, as set forth in claim 7, is characterized by further comprising the step S5 of backfilling the whole backfill area from 500mm above the top of the socket joint (102) to the ground by adopting undisturbed soil, wherein the compaction thickness of each layer is 300mm, the compaction degree is more than or equal to 95%, burying a settlement observation pile in the area, observing the coaxiality change of the socket joint within 6 months after the backfill is finished, and grouting and reinforcing the periphery of the socket joint (102) if the accumulated settlement difference is more than 10 mm.

Description

Flexible compensation structure of socket joint of nodular cast iron pipe and groove backfilling method of flexible compensation structure Technical Field The invention relates to the technical field of rain sewage pipeline construction, in particular to a flexible compensation structure of a socket joint of a nodular cast iron pipe and a groove backfilling method thereof. Background The socket type flexible interface is the most widely applied connection mode in the technical field of pipeline connection, and the typical construction process comprises the following steps of axially aligning a socket end of a pipeline to be installed with a socket end of a laid pipeline by using traction tools such as a manual hoist, a tightener and the like, slowly inserting the pipeline under the action of mechanical traction, sleeving a rubber sealing ring with a circular section on the outer wall of the socket in advance, and realizing sealing by extrusion deformation of the sealing ring and an inner cavity of the socket. The connecting mode has the advantages of convenience in installation and lower cost, and shows better sealing reliability in pipe section application with good geological conditions. However, because the designed gap between the bell mouth and the spigot is small, and the sealing ring is directly sleeved on the outer wall of the spigot, the coaxiality of the two pipelines which are pulled by the manual hoist in the actual construction process is difficult to ensure, when the deflection angle or radial deviation exists between the axis of the spigot and the axis of the bell mouth, the sealing ring is easy to generate uneven compression, distortion or even rolling in the process of entering the bell mouth, so that the partial sealing stress is insufficient or concentrated, the sealing effect is obviously reduced, the rubber aging is accelerated, once the axis deviation is generated, the sealing ring is in a continuous eccentric stress state, a capillary seepage channel is extremely easy to form between the sealing ring and the inner wall of the bell mouth, the interface seepage and the pipe Zhou Shuitu loss are induced after long-term operation, and the structural safety and the operation life of a pipe network system are seriously threatened. Accordingly, there is a need to develop a socket type flexible interface structure that can allow for initial installation misalignment and can ultimately ensure coaxiality through backfill consolidation. Disclosure of Invention In view of the above, the embodiment of the invention provides a flexible compensation structure of a socket joint of a nodular cast iron pipe and a groove backfilling method thereof, which are used for solving the technical problem that the sealing effect is easily reduced due to the fact that the socket joint and the socket joint are connected and sealed by a hand hoist in the prior sewage pipe. The embodiment of the invention provides a flexible compensation structure of a ductile cast iron pipe socket joint, which comprises the following components: A plurality of pipe bodies connected end to end, one end of each pipe body is a socket, and the other end of each pipe body is a bellmouth; The compensating structure comprises a mounting ring, a supporting ring and a plurality of guide pieces, wherein the mounting ring is arranged in the socket, the supporting ring is movably arranged in the mounting ring through a plurality of elastic pieces, and the guide pieces are arranged at equal intervals around the circumferential inner wall of the socket; the sealing ring is arranged on the periphery of the inserting opening, when the inserting opening of one pipe body passes through the bell mouth of the other pipe body, the inserting opening passes through the supporting ring, and the coaxiality of the inserting opening and the pipe body can be kept under the elastic extrusion of a plurality of guide pieces. Further, the socket comprises a conical expanding section and a cylindrical guiding section, and the outer wall of the mounting ring is attached to the inner wall of the cylindrical guiding section. Further, each guide piece is a bent steel plate, has elasticity, is in the length direction and faces to the socket axis, one end of each guide piece is welded with the inner wall of the mounting ring, and one end of each guide piece, which is far away from the mounting ring, is surrounded to form a circle with the same inner diameter of the pipe body. Further, one end of the mounting ring is provided with a limiting ring, the supporting ring is attached to the limiting ring, a plurality of stop blocks are arranged on the inner wall of the mounting ring, and one side surface, far away from the limiting ring, of the supporting ring is in sliding contact with the plurality of stop blocks. Further, a plurality of mounting seats are uniformly arranged on the circumferential outer wall of the supporting ring, and each elastic piece corresponds to one