A road repair structure for a collapsed urban road drainage pipeline

Abstract

A kind of urban road drainage pipeline collapsed road repair structure, the road repair structure is the structure newly built after adopting excavation mode to discard damaged collapsed pipeline, comprising: drainage pipeline, concrete foundation layer being arranged in the lower side of drainage pipeline, backfill layer being arranged in the upper side of drainage pipeline, and roadbed pavement structure being arranged in the upper side of backfill layer;Air bag for temporary plugging is arranged at the upstream and downstream of the collapsed position of the drainage pipeline, and steel sheet pile support is arranged around the collapsed position of the drainage pipeline.The steel sheet pile support of the utility model can reduce construction operation range, reduce the risk of slope collapse, and minimize the impact on the surrounding environment.

Description

Technical Field

[0001] This utility model relates to the technical field of municipal engineering drainage pipeline repair, specifically to a road repair structure for collapsed urban road drainage pipelines. Background Technology

[0002] Drainage pipes are a crucial component of municipal infrastructure, serving as the lifeline for the collection and transportation of urban rainwater and sewage. Their operational status directly impacts urban safety and the ecological environment. With the accelerating pace of urbanization, the importance of urban infrastructure has become increasingly prominent. Rainwater and sewage pipes, as a core component of the urban drainage system, bear the vital responsibility of collecting and transporting rainwater and sewage. However, due to limitations in early pipe materials and construction techniques, coupled with long-term operation and a lack of effective maintenance, many cities' rainwater and sewage pipes have suffered varying degrees of damage and collapse. This seriously affects the safe operation of urban drainage and poses a potential threat to residents' lives and the urban environment.

[0003] In a certain engineering project, the collapse of a drainage pipeline caused a road subsidence. The typical repair method is to directly excavate the road with a slope and retaining barriers, using a slope coefficient of 1:0.33 adjusted according to the actual soil conditions. The excavation width at the bottom of the pipeline trench strictly adheres to the "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering" (GB50268-2008). Reinforced concrete pipes are used to replace the damaged pipeline, with a 180° concrete foundation. High-quality soil is used for backfilling up to the bottom of the roadbed and pavement structure. Figure 1 As shown. After the pipeline is backfilled, the road surface will be restored to its original structure. The strength of this repair structure is relatively average, the excavation area is large, there are safety hazards when encountering poor soil conditions during slope excavation, the construction period is long, and it may cause significant disruption to urban traffic, residents' lives, and the urban environment.

[0004] When urban roads collapse due to damaged drainage pipes, especially in areas with high traffic volume and limited road space, safer, faster, and less impactful emergency repairs are often needed. Traditional construction methods such as setting up barriers and excavating slopes have disadvantages such as large construction work areas, safety hazards in areas with poor soil conditions, and significant impact on the surrounding environment. Utility Model Content

[0005] To address the aforementioned technical problems, this technical solution provides a road repair structure for collapsed urban road drainage pipes. By using sheet pile support, the construction work area can be reduced, the risk of slope collapse can be lowered, and the impact on the surrounding environment can be minimized; thus effectively solving the above problems.

[0006] This utility model is achieved through the following technical solution: A road repair structure for collapsed urban road drainage pipes is a newly constructed structure built after the damaged and collapsed pipes are destroyed by excavation. The structure includes: a drainage pipe, a concrete trench below the drainage pipe, a backfill layer above the drainage pipe, and a roadbed / pavement structure above the backfill layer. Airbags for temporary sealing are installed upstream and downstream of the collapsed drainage pipe location, and sheet piles are installed around the collapsed drainage pipe location.

[0007] Furthermore, the sheet pile support uses 12m long Type IV Larssen sheet piles, the walers are double-panel HW400×300×10×16 walers, and the supports are φ426×12 steel supports. The horizontal spacing of the steel supports is ≤4.0m, and the vertical spacing is ≤3.0m. The steel grade of the sheet piles, steel walers, steel supports, etc. is Q235B.

[0008] Furthermore, the Larssen sheet piles are constructed using the screen-type pile driving method.

[0009] Furthermore, the concrete trench is made of C25 concrete and backfilled to the centerline elevation of the drainage pipe, forming a semi-enclosed state for the drainage pipe; a crushed stone cushion layer is also provided on the lower side of the concrete trench.

[0010] Furthermore, the backfill layer is made of 6% cement-aggregate soil, compacted in layers, down to 50cm below the original roadbed and pavement structure.

[0011] Furthermore, the roadbed and pavement structure is consistent with the original roadbed and pavement structure.

[0012] Furthermore, the roadbed and pavement structure adopts "4cm AC-13 asphalt concrete + 6cm AC-20 asphalt concrete + 40cm C25 concrete" from top to bottom, and a 24cm anti-crack tape is used at the joint between the new roadbed and pavement structure and the original roadbed and pavement structure.

[0013] Furthermore, after the collapse of the pipeline and the road surface are repaired, the airbags need to be removed and the pipeline needs to be dredged and cleared.

[0014] Furthermore, after the collapse of the pipeline and the road surface are repaired, the steel sheet pile support can be retained in the road structure or removed from the existing structure.

[0015] Furthermore, when dismantling the sheet pile support, the Larssen sheet piles need to be pulled out. Static pressure extraction should be used when pulling out the Larssen sheet piles, and the piles should be pulled out at intervals using a jump extraction method. Grouting should be carried out as the sheet piles are pulled out to control the impact on the surrounding environment during the removal process and to ensure that the gaps after removal are filled and compacted in a timely and effective manner to prevent the foundation soil from settling. Beneficial effects

[0016] The road repair structure for collapsed urban road drainage pipes proposed in this utility model has the following advantages compared with the prior art: This technical solution employs an open-cut method to dismantle and rebuild damaged and collapsed pipelines, providing a more direct and thorough way to identify and eliminate pipeline problems compared to other repair methods. Compared to the slope excavation method used in the background technology, the use of sheet pile support reduces the construction area, lowers the risk of slope collapse, and minimizes the impact on the surrounding environment. Simultaneously, the drainage pipeline trench is backfilled with C25 concrete to the midpoint of the drainage pipeline elevation, and then directly backfilled with 6% cement-aggregate soil to the bottom of the road surface structure. This ensures both the bearing capacity of the pipeline foundation and the overall strength of the trench, while also facilitating construction and reducing the construction period. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure obtained after excavation using existing techniques in the background art.

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0019] The labels in the attached diagram are: 1-drainage pipe, 2-concrete trench, 3-crushed stone cushion layer, 4-backfill layer, 5-subgrade and pavement structure, 6-crack-resistant tape, 7-steel sheet pile support. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are only some embodiments of the present utility model, and not all embodiments. Various modifications and improvements to the technical solutions of the present utility model made by those skilled in the art without departing from the design concept of the present utility model should fall within the protection scope of the present utility model. Example 1

[0021] like Figure 2 As shown, a road repair structure for collapsed urban road drainage pipes is constructed by excavating and dismantling the damaged and collapsed pipes, and the road repair structure includes: Drainage pipe 1 has the same outer and inner diameters as the original drainage pipe.

[0022] A concrete trench 2 is provided on the lower side of the drainage pipe 1. The concrete trench 2 is made of C25 concrete and backfilled to the centerline elevation of the drainage pipe 1, forming a semi-enclosed state for the drainage pipe 1. A crushed stone cushion layer 3 is provided on the lower side of the concrete trench 2.

[0023] A backfill layer 4 is installed on the upper side of the drainage pipe 1. The backfill layer 4 is filled with 6% cement-gravel soil in layers and compacted until it reaches 50cm below the original roadbed and pavement structure.

[0024] A subgrade and pavement structure 5 is installed on the upper side of backfill layer 4; the subgrade and pavement structure 5 is consistent with the original subgrade and pavement structure. The subgrade and pavement structure 5 consists of "4cm AC-13 asphalt concrete + 6cm AC-20 asphalt concrete + 40cm C25 concrete" from top to bottom, with adhesive layers between the 13 and 20 asphalt concrete layers, and between the 20 and C25 concrete layers. A 24cm crack-resistant tape 6 is used at the joint between the new and original subgrade and pavement structures.

[0025] Airbags for temporary sealing are installed upstream and downstream of the collapsed location of the drainage pipe 1. After the collapsed pipe and road surface are repaired, the airbags need to be removed and the pipe needs to be dredged and cleared.

[0026] Sheet pile support 7 is installed around the collapsed location of drainage pipe 1; the sheet pile support 7 uses U-shaped Larssen sheet piles, each 12m long, type IV; the dimensions of the type IV Larssen sheet piles are: width 400mm, height 170mm, and thickness 15.5mm. The weight per meter is approximately 76.1kg, and its section modulus reaches 362cm². 3 / m, exhibiting excellent mechanical properties.

[0027] The walers are double-panel HW400×300×10×16 walers, and the supports are φ426×12 steel supports with a plane spacing of ≤4.0m and a vertical spacing of ≤3.0m. The steel grade of the steel sheet piles, steel walers, steel supports and other steel components is Q235B.

[0028] The Larssen sheet piles are constructed using the screen-type pile driving method. During construction, guide piles and guide walers must be used, and their positions must be ensured to be correct before pile driving. The horizontal positioning dimensions and verticality of each positioning column in the Larssen sheet piles must be measured and corrected during driving. Driving must be carried out in sections and steps, and single piles must not be driven in.

[0029] Insert 20 to 30 sheet piles in a row into the pre-installed auxiliary guide frame and interlock them. Then drive 1 to 2 piles at each end of the pile wall to a depth of 2 to 3 meters, and then drive the middle piles to the same depth. Repeat the above operation in batches, controlling the driving depth at each time to 0.5 to 3.0 meters, until all sheet piles are driven to the design depth.

[0030] After the collapse of the pipeline and the road surface are repaired, the steel sheet pile support can be retained in the road structure or removed from the existing structure.

[0031] When the sheet pile support 7 is removed, the Larssen sheet piles need to be pulled out. When pulling out the Larssen sheet piles, static pressure pulling should be used, and the piles should be pulled out at intervals in a jumping manner. Grouting should be carried out as the sheet piles are pulled out to control the impact on the surrounding environment during the removal of the sheet piles, and to ensure that the gaps after the removal are filled and compacted in a timely and effective manner to prevent the foundation soil from settling.

[0032] This embodiment uses steel sheet pile support 7. When excavating the pipeline foundation pit, the collapsed area is repaired by excavating the main pipe and replacing the asphalt surface layer, thereby achieving rapid and efficient repair and effectively solving the problem of drainage pipeline collapse at urban road intersections.

[0033] During implementation, the upstream and downstream ports of drainage pipe 1 were temporarily sealed with airbags, and temporary drainage measures were taken. Debris around the pipe was cleared. Sheet piles were driven into the perimeter of the planned construction area to support the pipe. The pipe foundation pit was excavated, and the damaged pipe at the collapsed area was removed and rebuilt. The trench was backfilled with C25 concrete to the pipe's elevation, and then backfilled in layers of 6% cement-aggregate soil to 50cm below the original ground level. The road surface structure consisted of "4cm AC-13 asphalt concrete + 6cm AC-20 asphalt concrete + 40cm C25 concrete" from top to bottom, with 24cm anti-crack tape at the joints. After the collapsed pipe and road surface were repaired, the temporary pipe seals were removed, and the area was dredged and cleared. Road facilities within the construction area were restored to their current state, and traffic was restored.

Claims

1. A road repair structure for collapsed urban road drainage pipes, wherein the road repair structure is a newly constructed structure after the damaged and collapsed pipes are dismantled through excavation, comprising: The drainage pipe (1), the concrete trench (2) set on the lower side of the drainage pipe (1), the backfill layer (4) set on the upper side of the drainage pipe (1), and the roadbed pavement structure (5) set on the upper side of the backfill layer (4); characterized in that: airbags for temporary sealing are set at the upstream and downstream of the collapse location of the drainage pipe, and sheet pile support (7) is set around the collapse location of the drainage pipe.

2. The road repair structure for collapsed urban road drainage pipes according to claim 1, characterized in that: The steel sheet pile support (7) includes Larssen steel sheet piles, walers and steel supports, with the plane spacing of the steel supports ≤4.0m and the vertical spacing ≤3.0m.

3. The road repair structure for collapsed urban road drainage pipes according to claim 2, characterized in that: The Larssen sheet piles were constructed using the screen-type pile driving method.

4. The road repair structure for collapsed urban road drainage pipes according to claim 1, characterized in that: The concrete trench (2) is made of C25 concrete and backfilled to the centerline elevation of the drainage pipe (1), forming a semi-enclosed state for the drainage pipe (1); a crushed stone cushion layer (3) is also provided on the lower side of the concrete trench (2).

5. A road repair structure for collapsed urban road drainage pipes according to claim 1, characterized in that: The backfill layer (4) is backfilled by compacting 6% cement-aggregate soil in layers down to 50cm below the original roadbed and pavement structure.

6. A road repair structure for collapsed urban road drainage pipes according to claim 1, characterized in that: The roadbed and pavement structure (5) is consistent with the original roadbed and pavement structure.

7. A road repair structure for collapsed urban road drainage pipes according to claim 1 or 6, characterized in that: The roadbed and pavement structure (5) adopts "4cm AC-13 asphalt concrete + 6cm AC-20 asphalt concrete + 40cm C25 concrete" from top to bottom. The new roadbed and pavement structure is connected to the original roadbed and pavement structure with anti-crack tape (6).

8. A road repair structure for collapsed urban road drainage pipes according to claim 1, characterized in that: After the collapse of the pipeline and road surface is repaired, the airbags need to be removed and the pipeline needs to be dredged and cleared.

9. A road repair structure for collapsed urban road drainage pipes according to claim 1, 2, or 3, characterized in that: The sheet pile support (7) may be removed or retained in the pavement structure.

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