High-density polyethylene (HDPE) double-wall corrugated pipe section repairing structure
By using a support system and a foundation reinforcement system, the problems of foundation settlement and deformation during the repair of HDPE double-wall corrugated pipe sections were solved, achieving a stable connection and sealing between the old and new pipes, and reducing construction costs and safety risks.
Patent Information
- Application Number
- CN202423084153.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing technologies cannot effectively solve problems such as foundation settlement, pipe deformation, joint sealing and stability when repairing HDPE double-wall corrugated pipe sections, and there are safety hazards in the construction process.
The system employs a support system, a pipeline connection system, and a foundation reinforcement system, including sheet piles, struts, baffles, connecting and fixing components, a leveling layer, and a concrete wrapping layer. The interlocking performance of the sheet piles and the multi-point support of the struts ensure the stability of the connection between the old and new pipelines, while the leveling layer and concrete layer enhance the bearing capacity of the foundation.
This achieved a stable connection between the old and new pipelines, reduced construction costs and safety risks, improved the foundation's resistance to settlement and deformation, and ensured the sealing and stability of the joints.
Smart Images
Figure CN223548577U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of municipal pipeline repair technology, specifically to a repair structure for HDPE double-wall corrugated pipe sections. Background Technology
[0002] Currently, most urban underground sewage pipe networks use HDPE (high-density polyethylene) double-wall corrugated pipes. However, a large portion of these sewage pipes are located within roadbeds. During operation, some pipe sections are frequently damaged by heavy vehicle loads, sharp stones from backfilling, leading to pipe leaks and settlement / deformation due to insufficient foundation bearing capacity. Current technologies for repairing HDPE double-wall corrugated pipe sections include trenchless and open-cut methods. Trenchless methods cannot address foundation and road surface settlement or achieve proper lining dredging. Open-cut methods cannot solve problems such as successful joint connection and interface stability in deformed repairs, and the safety and stability of small-scale excavation pits. Technical personnel have found these issues extremely challenging and have not yet developed an effective solution.
[0003] During the process of addressing this issue, the following challenges were discovered in the current repair work:
[0004] 1) The settlement and deformation of longer pipe sections cannot be repaired using trenchless lining, and it is impossible to complete the dredging and repair without damaging the original pipelines between two adjacent manholes, and it is impossible to simultaneously achieve road surface settlement repair.
[0005] 2) The lining method alters the pipe diameter, which may lead to pipe necking blockage after repair;
[0006] 3) Underground pipelines often deform to varying degrees due to years of heavy vehicle loads. Roadbed settlement compacts the soil around the pipelines, making it difficult to restore the inner lining.
[0007] 4) The open-cut method often fails to solve problems such as uneven settlement due to backfilling and poor sealing and stability of the joints between new and old pipelines;
[0008] 5) The lack of effective excavation face control and foundation pit safety measures during the open excavation process may lead to hazards such as collapse due to traffic congestion. Utility Model Content
[0009] To address the aforementioned shortcomings of existing technologies, a repair structure for HDPE double-wall corrugated pipe sections is provided, which improves construction safety while ensuring the sealing and stability of the connection between the new and old pipes.
[0010] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:
[0011] HDPE double-wall corrugated pipe section repair structure, applied to underground blocked pipes; characterized by: including a support system, a pipe connection system, and a foundation reinforcement system;
[0012] The support system includes sheet piles, struts, and baffles. Sheet piles are placed according to the location of the blocked pipeline, and a foundation pit is excavated between the sheet piles. Baffles are placed on both ends of the foundation pit, above the old pipeline and between the sheet piles on both sides. Several struts are spaced apart and supported on the sheet piles on both sides.
[0013] The pipe connection system includes a new pipe, a sleeve, and a connection and fixing component. One end of the new pipe has a socket, which connects to an existing pipe on one side. The other end of the new pipe connects to an existing pipe on the other side through the sleeve. One end of the connection and fixing component is fixed to the end of the new pipe, and the other end is fixed to the end of the existing pipe.
[0014] The foundation reinforcement system consists of, from bottom to top, a leveling layer and a concrete cushion layer below the pipeline, a concrete wrapping layer poured around and above the pipeline at a set height, and a backfill subgrade and pavement above the concrete wrapping layer; after the support system is removed, the backfill subgrade and pavement are constructed.
[0015] According to the above technical solution, steel sheet piles shall be installed at the designed location; the length of the steel sheet piles shall be greater than twice the maximum excavation depth of the foundation pit, and the depth of the steel sheet piles embedded in the soil at the bottom of the foundation pit shall be greater than or equal to the maximum excavation depth of the foundation pit.
[0016] According to the above technical solution, a support rod is installed on the sheet piles at the baffle from top to bottom at intervals of 30cm to 50cm; a wedge is inserted between the support rod and the baffle at the baffle; a set of support rods is installed on the sheet piles at intervals of 3 to 7 sheet piles, and each set of support rods consists of multiple support rods on the same vertical plane, with the spacing between adjacent support rods ranging from 1m to 1.5m.
[0017] According to the above technical solution, the strut includes a strut body and a top plate. The top plate is located at both ends of the strut and the two are connected by a spherical joint. The maximum rotation angle of the top plate at the end of the strut is 25°. The top plate is provided with an anti-slip surface. The wall thickness of the strut is ≥4.5mm. The strut is composed of multiple sections, and each section is provided with a pull-thread connection.
[0018] According to the above technical solution, it also includes road spikes, and road spike holes are provided on the baffle plate, through which the road spikes are inserted and driven into the roadbed on the side of the pit; the road spikes are made of threaded steel bars, with a sharpened needle tip at one end and a nut with a pull lug welded to the other end; the baffle plate is made of precast reinforced concrete slabs with a concrete strength ≥ C35 and an internal steel mesh; road spike holes are provided at the center of the equally divided rectangle of each precast slab, each baffle plate is provided with two lifting lugs, each baffle plate is 1m~2m wide and 10cm~14cm thick.
[0019] According to the above technical solution, 2-4 corrugated pipes are cut out at the ends of the upstream and downstream old pipes, and 1-2 corrugated pipes are cut out at the non-socket end of the new pipe for connecting the socket and sleeve of the new pipe; the connection and fixing components include annular groove ribs, steel wires, and ring wires. Multiple annular groove ribs are fixedly sleeved in the corrugated grooves of the corrugated pipes at both ends of the new pipe and in the corrugated grooves of the upstream and downstream old pipes. Several steel wires are connected to the annular groove ribs at the ends of the new pipe and the upstream old pipe, and several steel wires are connected to the annular groove ribs at the ends of the new pipe and the downstream old pipe; ring wires are wound around the outside of the steel wires at the ends of the new pipe and the upstream old pipe, and around the outside of the steel wires at the ends of the new pipe and the downstream old pipe.
[0020] According to the above technical solution, the number of steel wires at the connection between the new pipe end and the old pipe end is 5 to 8, and the steel wires are circumferentially spaced on the pipe; the spacing of the loop wires wrapped around the steel wires ranges from 1.5cm to 4mm.
[0021] According to the above technical solution, a pull plate is provided at the bottom of the new pipe. The pull plate is provided with a pull lug and a pull wire. The pull lug is fixed on the pull plate, and the pull wire is wrapped around the new pipe and fixed on the pull lug, thus confining the new pipe within the range of the pull wire.
[0022] According to the above technical solution, the upper end of the sleeve is provided with an opening, and the opening is reinforced by bolt connection; the width of the sleeve in the new pipe and the old pipe is ≥10cm, the total width of the sleeve is ≥25cm, and the sleeve is made of PVC pipe with a wall thickness of 3mm~4mm.
[0023] According to the above technical solution, the leveling layer is made of gravel, sand, and crushed stone. A 10cm to 20cm silt pit is dug at the bottom of the pipe, and the leveling layer is laid in the silt pit. The thickness of the leveling layer is 15cm to 20cm. The thickness of the concrete pad is 10cm to 15cm. The distance between the top surface of the concrete wrapping layer and the top of the new pipe is not less than 10cm.
[0024] This utility model has the following beneficial effects:
[0025] 1. A rectangular support structure consisting of sheet piles and retaining plates is installed around the perimeter of the foundation pit. This rectangular support structure fully utilizes the interlocking performance of the sheet piles and forms a stable and reliable support system through multiple points of bracing using several struts. This avoids the risk of overturning at the cantilever end of the sheet piles. The struts are easy to operate, reducing the cost of short-term repairs and saving costs. Secondly, one end of the new pipeline is connected via a socket joint, and the other end via a sleeve connection. Connection and fixing components are used to ensure the stability of the old and new pipelines. Finally, a leveling layer is applied to effectively compact and replace the foundation, greatly reducing the impact of mud on the poured concrete. A concrete wrapping layer is poured to ensure the sealing of the connection between the old and new pipelines. The concrete wrapping effectively enhances the uneven bearing capacity of the pipeline.
[0026] 2. The pipes are tied with tie plates to effectively prevent them from floating and deforming during the concrete pouring process.
[0027] 3. Gravel, sand, and crushed stone are used as leveling layers to effectively compact and replace the foundation, and greatly reduce the impact of mud on the poured concrete.
[0028] 4. Install road spikes, which, together with struts and wedges, firmly resist and compress the side soil, effectively preventing the baffle from sliding down and damaging the original pipeline; ensuring the stability of the baffle in the protection system.
[0029] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description
[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.
[0031] Figure 1 This is a cross-sectional view of the blocked pipe provided in an embodiment of this utility model;
[0032] Figure 2 This is a top view of the blocked pipe according to an embodiment of the present invention;
[0033] Figure 3 This is a schematic diagram of a circumferential cut of a blocked pipe according to an embodiment of this utility model;
[0034] Figure 4 This is a schematic diagram of the end corrugated pipe treatment for a blocked pipe according to an embodiment of this utility model;
[0035] Figure 5This is a cross-sectional view of the repaired embodiment provided by this utility model;
[0036] Figure 6 This is a repaired top view of an embodiment provided by this utility model;
[0037] Figure 7 This is a schematic diagram of the structure of the strut provided in an embodiment of this utility model;
[0038] Figure 8 This is a schematic diagram of the sleeve structure provided in an embodiment of the present invention;
[0039] In the diagram, 1. Sheet pile; 2. Support strut; 2-1. Pole body; 2-2. Top plate; 3. Baffle; 4. Foundation pit; 5. Old pipeline; 6. New pipeline; 6-1. Socket; 7. Sleeve; 8. Connecting and fixing components; 8-1. Annular grooved bar; 8-2. Steel wire; 8-3. Ring wire; 9. Leveling layer; 10. Concrete cushion layer; 13. Road spike; 14. Tie plate; 15. Tie wire; 16. Handheld positioning detector; 17. Wedge; 18. Cable tie. Detailed Implementation
[0040] The following is in conjunction with the appendix Figure 1-8 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.
[0041] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0043] Reference Figures 1-8 As shown, the HDPE double-wall corrugated pipe section repair structure provided by this utility model is applied to underground blocked pipes; its features include a support system, a pipe connection system, and a foundation reinforcement system.
[0044] The support system includes sheet piles 1, struts 2, and baffles 3. Sheet piles are placed according to the location of the blocked pipe, and a foundation pit 4 is excavated between the sheet piles. The baffles are placed on both ends of the foundation pit, above the old pipe 5 and between the sheet piles on both sides. Several struts are spaced apart and supported on the sheet piles on both sides.
[0045] The pipe connection system includes a new pipe 6, a sleeve 7, and a connecting and fixing component 8. One end of the new pipe is provided with a socket 6-1, which connects to the old pipe on one side. The other end of the new pipe is connected to the old pipe on the other side through the sleeve. One end of the connecting and fixing component is fixed to the end of the new pipe, and the other end is fixed to the end of the old pipe.
[0046] The foundation reinforcement system consists of, from bottom to top, a leveling layer 9 and a concrete cushion layer 10 located below the pipeline, a concrete wrapping layer poured around and above the pipeline at a set height, and a backfill subgrade and pavement located above the concrete wrapping layer; after the support system is removed, the backfill subgrade and pavement are constructed.
[0047] In this embodiment, a rectangular support structure composed of sheet piles and baffles is set around the perimeter of the foundation pit. This rectangular support structure fully utilizes the interlocking performance of the sheet piles and forms a stable and reliable support system through multiple points of bracing using several struts. This avoids the risk of overturning at the cantilever end of the sheet piles, simplifies strut operation, reduces the cost of short-term repairs, and saves costs. Secondly, one end of the new pipeline is connected via a socket joint, and the other end via a sleeve connection; the stability of the old and new pipelines is achieved using connecting and fixing components. Finally, a leveling layer is applied to effectively compact and replace the foundation, greatly reducing the impact of mud on the poured concrete; a concrete wrapping layer is poured to ensure the sealing of the connection between the old and new pipelines; and the concrete wrapping effectively enhances the uneven bearing capacity of the pipeline.
[0048] In Example 1, steel sheet piles are installed according to the design location; the length of the steel sheet pile is greater than twice the maximum excavation depth of the foundation pit, and the depth of the steel sheet pile at the bottom of the foundation pit is greater than or equal to the maximum excavation depth of the foundation pit.
[0049] In Example 1, in order to improve the stability of the support system, a cross brace is installed on the sheet piles at the baffle, with a spacing of 30cm to 50cm from top to bottom; a wedge 17 is inserted between the cross brace and the baffle at the baffle; a set of cross braces is installed on the sheet piles every 3 to 7 sheet piles, and each set of cross braces consists of multiple cross braces on the same vertical plane, with a spacing of 1m to 1.5m between adjacent cross braces.
[0050] Preferably, a preferred structural form of the strut is provided. The strut includes a rod body 2-1 and a top plate 2-2, with the top plate located at both ends of the rod and connected by a spherical joint; the maximum rotation angle of the top plate at the end of the rod is 25°; the top plate has an anti-slip surface; the preferred rod body is a regular polygon with a circular interior, a wall thickness ≥4.5mm, and consists of multiple sections; the embodiment shown in the figure uses three sections, with threaded connections between each section.
[0051] Example 2
[0052] The structure and principle of Example 2 are similar to those of Example 1, except that: to ensure the stability of the baffle in the protection system, it also includes road spikes 13. Road spike holes are provided on the baffle, through which the road spikes are driven into the roadbed on the side of the pit. The road spikes are made of threaded steel bars, with a ground needle tip at one end and a nut with a pull lug welded to the other end. The diameter and length of the road spikes are set according to requirements; in the example shown, a diameter of 12mm and a length of 35cm are used. The baffle is made of precast reinforced concrete slabs with a concrete strength ≥C35 and an internal steel mesh. Road spike holes are provided at the center of the equally divided rectangle of each precast slab. Each baffle has two lifting lugs. The width of each baffle is 1m~2m, and the thickness is 10cm~14cm.
[0053] Example 3
[0054] The structure and principle of Example 3 are similar to those of Examples 1-2, except that a preferred structural form of the connection and fixing component is provided to ensure the reliability of the connection between the new and old pipes. Of course, the structural form of the connection and fixing component between the new and old pipes is not limited to the structure described in this example; other existing structures can also be used.
[0055] Cut 2-4 corrugated pipes at the ends of the old pipes upstream and downstream, and cut 1-2 corrugated pipes at the non-socket end of the new pipe for connecting the socket and sleeve of the new pipe; the connection and fixing components include annular groove ribs 8-1, steel wires 8-2, and ring wires 8-3. Multiple annular groove ribs are fixedly sleeved in the corrugated grooves of the corrugated pipes at both ends of the new pipe, and in the corrugated grooves of the upstream and downstream old pipes. Several steel wires are connected to the annular groove ribs at the ends of the new pipe and the upstream old pipe, and several steel wires are connected to the annular groove ribs at the ends of the new pipe and the downstream old pipe; ring wires are wound around the outside of the steel wires at the ends of the new pipe and the upstream old pipe, and around the outside of the steel wires at the ends of the new pipe and the downstream old pipe.
[0056] The steel wire used is No. 0 to No. 2 steel wire. The grooved rib is made by bending No. 1 to No. 3 steel wire according to the shape of the corrugated pipe groove, reducing the size by 2 to 3 mm. Each grooved rib has no less than two bending grooves on the pipe. The ring wire is made of No. 3 to No. 5 steel wire, and is cut from a bundle of steel wire according to the required length of the ring wire.
[0057] In Example 3, the preferred number of steel wires at the connection between the new pipe end and the old pipe end is 5 to 8, with the steel wires circumferentially spaced on the pipe; the spacing between the loop wires wound on the steel wires ranges from 1.5cm to 4mm.
[0058] Example 4
[0059] The structure and principle of Example 4 are similar to those of Examples 1-3, except that: in order to prevent the new pipe from floating and deforming during the concrete encapsulation and pouring process, a pull plate 14 is provided at the bottom of the new pipe, and a pull lug and a pull wire 15 are provided on the pull plate. The pull lug is fixed on the pull plate, and the pull wire is wrapped around the new pipe and fixed on the pull lug, thus confining the new pipe within the range of the pull wire; the pull plate is made of precast concrete slab with a concrete strength ≥ C25.
[0060] In Examples 1-4, since the pipe opening of the old pipe may have deformed, in order to ensure a smooth connection between the new and old pipes, the upper end of the sleeve is provided with an opening, and the opening is reinforced with bolts; the width of the sleeve in both the new and old pipes is ≥10cm, the total width of the sleeve is ≥25cm, and the sleeve is made of PVC pipe with a wall thickness of 3mm~4mm.
[0061] In Examples 1-4, the leveling layer is made of gravel, sand, and crushed stone. A 10cm-20cm silt pit is dug at the bottom of the pipe, and the leveling layer is laid in the silt pit. The thickness of the leveling layer is 15cm-20cm. The thickness of the concrete pad is 10cm-15cm. The distance between the top surface of the concrete wrapping layer and the top of the new pipe is not less than 10cm.
[0062] The construction process of this utility model is as follows:
[0063] S1: Confirm the excavation location of the foundation pit. First, measure the location of the blockage section, then mark the excavation site.
[0064] Using a 50m long 25mm PPR water supply hose with a positioning probe, insert it into the pipe from both upstream and downstream manholes to the blockage location. Hold the positioning detector 16 to determine the probe positions D1 and D2, and measure the length of the blocked section D12. Then, install a 70% diameter circular plastic steel hub at the probe, and insert the hose again from both upstream and downstream manholes to the point where it cannot be inserted any further. Hold the positioning detector to determine the probe positions D3 and D4, and measure the length of the repair section D34 and the pipe section position line. Finally, remove the probe and circular plastic steel hub from the hose end, install a spiral drill bit, and attempt to insert it into the pipe from both upstream and downstream manholes to pass through the blocked section. After passing through, remove the spiral drill bit at the passing end manhole and continue to pass through the pipe, so that both ends of the hose are in the upstream and downstream pipes for diversion.
[0065] Based on the pipeline centerline of the upstream and downstream manholes, extend line D34 and connect D3 and D4 to the center points of the pipelines in the corresponding end manholes, and calculate the offset angle θ. When θ > 12°, use line D34 as the centerline and a deviation line ≥ "pipeline radius R + 30cm" to mark the edge lines on both sides of the opening (sheet pile); extend the corrugated length of 4-6 HDPE double-wall corrugated pipes towards the manholes at both ends from D3 and D4 to mark the edge lines at both ends of the opening. When θ < 12°, use the pipeline centerline as the centerline and a deviation line ≥ "pipeline radius R + 30cm" to mark the edge lines on both sides of the opening (sheet pile); extend the corrugated length of 4-6 HDPE double-wall corrugated pipes towards the manholes at both ends from D3 and D4 to mark the edge lines at both ends of the opening.
[0066] S2: Support System Construction. Based on the laid-out excavation line, arrange the sheet piles, ensuring that the edges of both ends of the excavation are located at the sheet pile recesses. After arrangement, mark the outer edges of the sheet piles and construct the sheet piles along the edges after cutting and removing the road surface structure within the excavation. The sheet pile length must be greater than twice the maximum excavation depth, and the depth of the sheet piles embedded in the soil at the bottom of the excavation must be greater than or equal to the maximum excavation depth.
[0067] S4. Excavation of the foundation pit. Based on the excavation line, leave a 10cm layer of soil at both ends for excavation until the pipeline is exposed. Then, trim the edges of the 10cm layer at both ends and promptly install the retaining walls. Install support rods every 30cm-50cm, with at least one support rod along the top and bottom edges of each retaining wall. On the sheet piles, install a set of support rods every 3-7 sheet piles. Each set of support rods consists of multiple support rods on the same vertical plane, with a spacing of 1m-1.5m between adjacent support rods. Drive spikes into the soil through the spike holes in the retaining walls to ensure tight contact between the retaining walls and the soil. Finally, insert wedges into the gap between the support rods and the retaining walls and further tap the wedges to ensure tight force between the retaining walls and the support rods. Promptly tighten any exposed spikes.
[0068] The baffle is made of precast reinforced concrete slabs with a concrete strength ≥ C35 and an internal steel mesh. Each precast slab has a road spike hole at the center of its equally divided rectangle, and each baffle has two lifting lugs. The width of each baffle is 1m to 2m and the thickness is 10cm to 14cm.
[0069] The strut consists of a strut body and a top plate, which are located at both ends of the strut and connected by a spherical joint. The maximum rotation angle of the top plate at the end of the strut is 25°. The top plate has an anti-slip surface. The strut is composed of multiple sections, and each section is connected by a pulley thread.
[0070] S5: Pipe cutting and pipe end finishing. Following lines D3 and D4, prioritize circumferentially cutting the downstream pipe, then circumferentially cutting the upstream pipe, and removing the flexible hose from inside. Next, excavate and clear the blocked section of the pipe base from the downstream end to the upstream end, clearing to 20cm from the bottom of the pipe, removing any silt that has seeped into the upstream pipe, and waiting for the upstream water to drain through the downstream pipe opening. Then, seal the pipe opening in the upstream manhole, pump out the water remaining in the pipe base, remove 2-4 corrugated layers from the upstream pipe end and 2-4 corrugated layers from the downstream pipe end (retaining at least 2 corrugated layers at the pipe end), and use a grinder to polish and finish the rough edges and surface of the pipe end.
[0071] S6: Treatment of leveling layer and concrete cushion layer in foundation reinforcement system. Manually remove 10cm~20cm of silt from pipe foundation and lay a 15~20cm leveling layer. The leveling layer is made of gravel, sand, and crushed stone. The sand and gravel leveling layer is compacted with a plate tamper. Concrete cushion layer is constructed on the leveling layer with a thickness of 10cm~15cm.
[0072] S7: New pipe replacement. After measuring the distance between the two ends of the pipe head after circumferential cutting, cut a new pipe and open the cap at the socket end to facilitate splicing with the original deformed pipe head upstream. Cut off 1.5 to 2 corrugated layers from the other end of the pipe head and use a grinder to polish and repair the burrs and rough surfaces of the pipe head.
[0073] Next, at least one tie plate is evenly installed every 2 meters on the leveling layer, with a total of at least one tie plate. The ring thread is then fitted onto the new pipe, and the sleeve is connected to the downstream pipe end. After connecting the socket to the upstream end, the new pipe is adjusted to align with the downstream pipe end. The sleeve is then moved to connect the new and old pipes. Non-woven fabric is placed inside the sleeve joint before tightening the sleeve joint screws. The upper end of the sleeve has an opening, which is reinforced with bolts. The width of the sleeve on both the new and old pipes is ≥10cm, and the total width of the sleeve is ≥25cm. The sleeve is made of PVC pipe with a wall thickness of 3mm~4mm.
[0074] Then, wrap the upstream socket with non-woven fabric strips and weld the measured and positioned groove ribs (the groove rib protrusions are at the corrugated groove) onto the steel wire, and use cable ties 18 to tie and fix the steel wire of the welded groove ribs onto the corrugated groove. Use 5 to 8 steel wires evenly distributed at the pipe joint.
[0075] Finally, attach the loop wire from the new pipe to the outside of the steel wire at the joint between the old and new pipes, and use tie wire to secure the loop wire to the steel wire. The loop wire should be wrapped around the steel wire at intervals of 1.5cm to 4cm.
[0076] S8: Concrete wrapping layer pouring. Tie the tie plate to the new pipe using tie bars, and begin pouring and vibrating the concrete wrapping layer. The distance between the top surface of the concrete wrapping layer and the top of the new pipe should not be less than 10cm.
[0077] S9: Removal of the support system. After the concrete wrapping layer has initially set, remove the road spikes and wedges from the baffle, lift and remove the baffle, loosen and remove the struts, and pull out the sheet piles.
[0078] S10: Subgrade backfilling and pavement restoration construction. After the support system is removed, backfill soil in a timely manner, use a plate compactor installed on an excavator to quickly compact the subgrade backfill soil, and restore the pavement in a timely manner according to the structural requirements of the raw materials.
[0079] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.
Claims
1. HDPE double-wall corrugated pipe section repair structure, applied to underground blocked pipes; characterized by: This includes support systems, pipeline connection systems, and foundation reinforcement systems; The support system includes sheet piles, struts, and baffles. Sheet piles are placed according to the location of the blocked pipeline, and a foundation pit is excavated between the sheet piles. Baffles are placed on both ends of the foundation pit, above the old pipeline and between the sheet piles on both sides. Several struts are spaced apart and supported on the sheet piles on both sides. The pipe connection system includes a new pipe, a sleeve, and a connection and fixing component. One end of the new pipe has a socket, which connects to an existing pipe on one side. The other end of the new pipe connects to an existing pipe on the other side through the sleeve. One end of the connection and fixing component is fixed to the end of the new pipe, and the other end is fixed to the end of the existing pipe. The foundation reinforcement system consists of, from bottom to top, a leveling layer and a concrete cushion layer below the pipeline, a concrete wrapping layer poured around and above the pipeline at a set height, and a backfill subgrade and pavement above the concrete wrapping layer; after the support system is removed, the backfill subgrade and pavement are constructed.
2. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: Install steel sheet piles according to the design location; the length of the steel sheet piles must be greater than twice the maximum excavation depth of the foundation pit, and the depth of the steel sheet piles embedded in the soil at the bottom of the foundation pit must be greater than or equal to the maximum excavation depth of the foundation pit.
3. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: On the sheet piles at the baffle, a strut is installed every 30cm to 50cm from top to bottom; a wedge is inserted between the strut and the baffle; on the sheet piles, a set of struts is installed every 3 to 7 sheet piles, and each set of struts consists of multiple struts on the same vertical plane, with the spacing between adjacent struts ranging from 1m to 1.5m.
4. The HDPE double-wall corrugated pipe section repair structure according to claim 1 or 3, characterized in that: The strut consists of a strut body and a top plate, which are located at both ends of the strut and connected by a spherical joint. The maximum rotation angle of the top plate at the end of the strut is 25°. The top plate has an anti-slip surface. The strut is composed of multiple sections, and each section is connected by a pulley thread.
5. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: It also includes road spikes, and the baffle is provided with road spike holes, through which the road spikes are driven into the roadbed on the side of the pit; the road spikes are made of threaded steel bars, with a sharpened needle tip at one end and a nut with a pull lug welded to the other end; the baffle is made of precast reinforced concrete slabs with a concrete strength ≥ C35 and an internal steel mesh; each precast slab has a road spike hole at the center of a rectangularly divided section, each baffle has two lifting lugs, each baffle is 1m~2m wide and 10cm~14cm thick.
6. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: Two to four corrugated pipes are cut at the ends of the upstream and downstream old pipes, and one to two corrugated pipes are cut at the non-socket end of the new pipe for connecting the socket and sleeve of the new pipe. The connection and fixing components include annular groove ribs, steel wires, and ring wires. Multiple annular groove ribs are fixedly sleeved in the corrugated grooves of the corrugated pipes at both ends of the new pipe and in the corrugated grooves of the upstream and downstream old pipes. Several steel wires are connected to the annular groove ribs at the ends of the new pipe and the upstream old pipe, and several steel wires are connected to the annular groove ribs at the ends of the new pipe and the downstream old pipe. Ring wires are wrapped around the outside of the steel wires at the ends of the new pipe and the upstream old pipe, and around the outside of the steel wires at the ends of the new pipe and the downstream old pipe.
7. The HDPE double-wall corrugated pipe section repair structure according to claim 6, characterized in that: The number of steel wires at the connection between the new and old pipe ends is 5 to 8, and the steel wires are circumferentially spaced on the pipe; the spacing between the loop wires wrapped around the steel wires ranges from 1.5cm to 4mm.
8. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: A pull plate is provided at the bottom of the new pipe. The pull plate is equipped with a pull lug and a pull wire. The pull lug is fixed to the pull plate, and the pull wire is wrapped around the new pipe and fixed to the pull lug, thus confining the new pipe within the range of the pull wire.
9. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: The upper end of the sleeve is provided with an opening, which is reinforced by bolt connection; the width of the sleeve in the new and old pipes is ≥10cm, the total width of the sleeve is ≥25cm, and the sleeve is made of PVC pipe with a wall thickness of 3mm~4mm.
10. The HDPE double-wall corrugated pipe section repair structure according to claim 1, characterized in that: The leveling layer is made of gravel, sand, and crushed stone. A 10cm-20cm silt pit is dug at the bottom of the pipe, and the leveling layer is laid in the silt pit. The thickness of the leveling layer is 15cm-20cm. The thickness of the concrete pad is 10cm-15cm. The distance between the top surface of the concrete wrapping layer and the top of the new pipe is not less than 10cm.