Drainage structure for temporary plugging and uninterruptible water supply in renewal period of existing drainage box culvert
By setting up a temporary brick retaining wall and support frame system at the drainage end of the existing drainage culvert, the problem of continuous water flow during the construction period was solved, the construction area was kept dry, construction costs and energy consumption were reduced, and construction efficiency was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOHYDRO BUREAU 11 CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-19
AI Technical Summary
When connecting a new culvert to an existing drainage culvert, how can we maintain the sustainable flow of water during the construction period, avoid cutting off the river channel or suspending the function of the pipeline network, and reduce construction costs and energy consumption?
A temporary brick retaining wall is set up at the drainage end of the existing drainage culvert, and a drainage outlet is opened on the retaining wall to connect to the drainage pipe. The water is guided to the newly built drainage pipe outside the construction area. The support frame system supports the construction area to keep the construction area dry. At the same time, the drainage pipe passing through the support frame system supports the drainage pipe in the construction area to keep the construction area dry.
The construction area was kept dry, avoiding the need to build additional cofferdams and diversion channels, reducing construction costs and energy consumption, and improving construction efficiency.
Smart Images
Figure CN224259215U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water conservancy engineering technology, specifically to a diversion structure that allows for temporary sealing during the continued construction of existing drainage culverts without interrupting water flow. Background Technology
[0002] With the acceleration of urbanization, the demand for drainage culverts, as core facilities for urban flood control, drainage, and sewage interception and collection, has been increasing year by year.
[0003] When connecting a new culvert to an existing drainage culvert, there is often a situation where the existing drainage culvert needs to carry continuous flow, while the new culvert needs to be constructed on dry ground. How to maintain the continuous flow of water during the construction period and avoid cutting off the river or suspending the function of the pipeline network has become a common problem in the industry.
[0004] Traditional construction methods include building cofferdams and diversion structures at the water source end, and continuously pumping water to lower the water level, but all of these methods have varying degrees of construction problems. The cofferdam diversion method involves building earth-rock cofferdams upstream and downstream of the construction section, excavating temporary diversion channels to divert water to the outside of the construction area, and using water pumps to pump out the accumulated water to create dry construction conditions. However, this method suffers from high construction costs and additional land occupation. The continuous pumping method involves deploying submersible pump sets on the work surface to continuously pump water 24 hours a day to maintain a dry environment. However, this method suffers from high construction energy costs and poor long-term economic efficiency.
[0005] To solve this problem, it is necessary to redesign the drainage system based on the structural characteristics of the existing drainage culverts, thereby achieving breakthroughs in construction costs and timelines. Utility Model Content
[0006] The purpose of this utility model is to address the shortcomings of existing technologies by providing a diversion structure that allows for temporary sealing of existing drainage culverts during the continued construction period without requiring additional modifications to cofferdams or diversion channels, ensuring good dry conditions in the construction area, and reducing construction costs.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a drainage structure for temporary sealing during the continued construction of an existing drainage culvert without interrupting water flow, comprising an existing drainage culvert, a temporary brick retaining wall, drainage pipes, and a support frame system;
[0008] The temporary brick retaining wall is set at the drainage end of the existing drainage culvert and is integrated with the original structure of the existing drainage culvert to stop the drainage of the existing drainage culvert.
[0009] The area following the drainage end of the existing drainage box culvert is the construction area for the new drainage box culvert.
[0010] The temporary brick retaining wall has a drainage outlet on its surface, and the inlet of the drainage pipe is connected to the drainage outlet. The drainage pipe is used to draw water from the existing drainage culvert out of the construction area.
[0011] The support frame system is used to support the drainage pipe.
[0012] Preferably, the temporary brick retaining wall is set 50cm-100cm before the end of the existing drainage culvert and is located inside the existing drainage culvert.
[0013] Preferably, the temporary brick retaining wall is provided with a waterproof layer.
[0014] Preferably, the thickness of the brick temporary retaining wall is ≥350mm.
[0015] Preferably, the waterproof layer is waterproof mortar with a thickness of ≥20mm.
[0016] Preferably, there are two drain outlets, distributed along the upper and lower space.
[0017] Preferably, the diameter of the drain outlet and the drain pipe is ≥600mm.
[0018] Preferably, the lower drainage pipe is 15cm-20cm higher than the bottom plate of the existing drainage culvert, and a horizontal crossbar is installed between the two drainage pipes as a bracket support. The horizontal crossbar is part of the support frame system.
[0019] Preferably, the support frame system includes several steel pipe support frames, each steel pipe support frame is assembled from two vertical uprights and three horizontal crossbars, the distance between the two uprights is at least one meter, the distance between the horizontal crossbars is greater than 1.5 meters, and several horizontal longitudinal bars connect adjacent steel pipe support frames.
[0020] Preferably, the bottom end of the vertical upright of the steel pipe support frame is integrally cast into the bottom plate of the newly built drainage culvert.
[0021] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model uses a temporary brick retaining wall to stop the existing drainage culvert at its end, and opens three drainage outlets behind the temporary brick retaining wall. After connecting the drainage pipe, the wastewater is discharged after passing through the construction area of the new drainage culvert, so that the construction area of the new drainage culvert is kept dry. At the same time, the passing drainage pipe is supported in the air by a support frame system to avoid interfering with the construction area of the new drainage culvert.
[0022] This solution successfully addresses the issue of maintaining dry ground in the construction area of newly built drainage culverts, eliminating the need for large-scale temporary diversion facilities such as cofferdams. It also results in relatively low investment costs and significantly improved construction efficiency. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of a drainage diversion structure for temporary sealing during the continued construction of existing drainage culverts, which ensures uninterrupted water flow.
[0024] Figure 2 yes Figure 1 A schematic diagram of the AA cross section.
[0025] Figure 3 yes Figure 1 Schematic diagram of the cross-section of BB.
[0026] In the diagram: 1. Existing drainage culvert; 2. Structural joint of drainage culvert; 3. Newly constructed cast-in-place drainage culvert; 4. Temporary brick retaining wall; 5. Drainage pipe; 6. Support frame system; 7. Water balance bar; 8. Horizontal longitudinal bar; 9. Cement mortar. Detailed Implementation
[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0028] like Figures 1-3 As shown, a drainage diversion structure for temporary sealing during the renovation of an existing drainage culvert without interrupting water flow includes the existing drainage culvert 1, a brick temporary retaining wall 4, a drainage pipe 5, and a support frame system 6.
[0029] The temporary brick retaining wall 4 is installed at the drainage end of the existing drainage culvert 1 and is integrated with the original structure of the existing drainage culvert 1. Specifically, it is installed 50-100cm before the end of the existing drainage culvert 1 and is used to stop the drainage of the existing drainage culvert 1. The existing drainage culvert 1 is the original drainage culvert, and the newly built drainage culvert 3 is a new construction area connecting to the existing drainage culvert 1. Each drainage culvert has a drainage culvert structural joint 2, and the structure is formed by assembling sections one by one.
[0030] In this embodiment, the temporary brick retaining wall 4 is constructed using MU10 sintered bricks and M10 cement mortar, with a wall thickness of 370mm and a wall height of 0.3m above the top elevation of the uppermost drainage pipe. For seepage prevention, a 20mm thick 1:2 waterproof mortar (mixed with 5% waterproof powder) is applied to the inner side.
[0031] In other embodiments, the wall thickness can be determined according to the specifications of the existing drainage culvert 1, typically ≥350mm.
[0032] The area following the drainage end of the existing drainage culvert 1 is the construction area for the new drainage culvert 3, which is mainly constructed by pouring concrete.
[0033] The temporary brick retaining wall 4 has a drainage outlet on its surface, and the inlet of the drainage pipe 5 is connected to the drainage outlet. The drainage pipe 5 is used to draw water from the existing drainage culvert out of the construction area.
[0034] Specifically, in this embodiment, during the construction of the temporary brick retaining wall 4, two Φ600mm overflow drainage pipes are installed in the center from bottom to top. This can improve the stability of the installation and facilitate sealing and seepage prevention. The first drainage pipe is 15-20cm higher than the bottom plate of the culvert. A horizontal crossbar 7 is installed between the second drainage pipe and the first drainage pipe as a bracket support. The end of the drainage pipe serves as the inlet of the diversion structure inside the existing drainage culvert, and the tail of the drainage pipe 5 serves as the outlet of the diversion structure outside the end point of the construction of the new drainage culvert.
[0035] In other embodiments, the diameter of the drainage pipe 5 can be even larger.
[0036] The support frame system is used to support the drainage pipe. In this embodiment, the support frame system includes several steel pipe support frames. Each steel pipe support frame is assembled from two vertical uprights and three horizontal crossbars 7. The distance between the two uprights is at least one meter, and the distance between the horizontal crossbars is greater than 1.5 meters. A horizontal longitudinal bar 8 connects two adjacent steel pipe support frames.
[0037] The bottom of the vertical poles of the steel pipe support frame is integrally cast into the bottom slab of the newly built drainage box culvert. Specifically, during the construction of the reinforced concrete bottom slab structure of the newly built drainage box culvert 3, the bottom of the vertical poles of the steel pipe support frame is directly cast into the bottom slab structure. After the overall construction of the continued drainage box culvert is completed, the temporary sealing and non-stop water diversion structure is removed, and the steel pipe support frame, drainage pipe, and brick retaining wall are removed sequentially from downstream to upstream. Since the bottom of the vertical poles of the steel pipe support frame is embedded in the bottom slab of the box culvert, the poles above the bottom slab are cut and removed. The poles embedded in the bottom slab are sealed by backfilling the hollow part of the steel pipe with cement mortar 9 with the same strength as the box culvert concrete, thereby filling the reinforced concrete bottom slab.
[0038] Application example description:
[0039] Taking a drainage culvert made of C25 reinforced concrete as an example, its dimensions are 3.1*3.1m, and the concrete thickness of the bottom slab, side walls, and top slab is 0.3m. The clear flow dimensions of the drainage culvert are 2.5*2.5m. After the first-phase drainage culvert is completed and flow is achieved, an additional drainage culvert section is added according to the actual site conditions, extending the drainage culvert to the existing riverbed gully. In this case, it is necessary to consider how to keep the second-phase drainage culvert dry during construction while the first-phase drainage culvert continues to flow.
[0040] The proposed solution involves constructing a brick retaining wall 50cm before the end of the first-phase drainage culvert. The retaining wall is constructed using MU10 sintered bricks and M10 cement mortar, with a wall thickness of 370mm and a height equal to the top elevation of the uppermost drainage pipe plus 0.3m. The inner side of the retaining wall is plastered with a 20mm thick 1:2 waterproof mortar (mixed with 5% waterproof powder). During the construction of the brick retaining wall, two Φ600mm HDPE corrugated drainage pipes are installed centrally from bottom to top for drainage. The first drainage pipe is 20cm higher than the bottom slab of the culvert. A horizontal crossbar is installed between the second and first drainage pipes as a support frame. The end of the drainage pipe serves as the inlet of the drainage structure within the existing drainage culvert, and the tail of the drainage pipe serves as the outlet of the drainage structure outside the end point of the continued drainage culvert construction. Each HDPE corrugated drainage pipe is 6m long, and the pipes are connected using a socket joint.
[0041] Considering that the continued construction of the drainage box culvert is a cast-in-place reinforced concrete structure, the Φ600mm overflow drainage pipe is supported and fixed in the space above the bottom plate of the continued construction of the drainage box culvert using Φ48×3.0mm coupler-type steel pipe scaffolding. The steel pipe support frame consists of 2 vertical uprights, 3 horizontal crossbars, and 6 horizontal longitudinal bars. The vertical uprights are 2.5m long and spaced 1.2m apart. The horizontal crossbars are 1m long and spaced 1.8m apart. The horizontal longitudinal bars are arranged along the length of the second phase drainage box culvert.
[0042] During the construction of the reinforced concrete base slab structure of the continued drainage box culvert, the steel pipe support frame was directly poured into the base slab structure. After the overall construction of the continued drainage box culvert was completed, the temporary sealing and uninterrupted water diversion structure was removed. That is, the steel pipe support frame, drainage pipe, and brick retaining wall were removed sequentially from downstream to upstream. Since the bottom of the vertical poles of the steel pipe support frame was buried in the box culvert base slab and could not be removed, the poles above the base slab were cut off by cutting method, and then the hollow part of the steel pipe poles buried in the base slab was backfilled and sealed with M25 cement mortar.
[0043] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.
Claims
1. A diversion structure for temporary sealing during the continued construction of existing drainage culverts without interrupting water flow, characterized in that: This includes existing drainage culverts, temporary brick retaining walls, drainage pipes, and support systems. The temporary brick retaining wall is set at the drainage end of the existing drainage culvert and is integrated with the original structure of the existing drainage culvert to stop the drainage of the existing drainage culvert. The area following the drainage end of the existing drainage box culvert is the construction area for the new drainage box culvert. The temporary brick retaining wall has a drainage outlet on its surface, and the inlet of the drainage pipe is connected to the drainage outlet. The drainage pipe is used to draw water from the existing drainage culvert out of the construction area. The support frame system is used to support the drainage pipe.
2. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 1, characterized in that: The temporary brick retaining wall is set 50cm-100cm in front of the end of the existing drainage culvert and is located inside the existing drainage culvert.
3. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 2, characterized in that: The temporary brick retaining wall is equipped with a waterproof layer.
4. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 3, characterized in that: The thickness of the temporary brick retaining wall is ≥350mm.
5. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 3, characterized in that: The waterproof layer is waterproof mortar with a thickness of ≥20mm.
6. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 5, characterized in that: There are two drainage outlets, distributed along the upper and lower spaces.
7. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 6, characterized in that: The diameter of the drain outlet and drain pipe is ≥600mm.
8. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 7, characterized in that: The drainage pipe located below is 15cm-20cm higher than the bottom slab of the existing drainage culvert. A horizontal crossbar is installed between the two drainage pipes as a bracket support, and the horizontal crossbar is part of the support frame system.
9. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 8, characterized in that: The support frame system includes several steel pipe support frames. Each steel pipe support frame is assembled from two vertical uprights and three horizontal crossbars. The distance between the two uprights is at least one meter, and the distance between the horizontal crossbars is greater than 1.5 meters. Several horizontal longitudinal bars connect adjacent steel pipe support frames.
10. The drainage structure for temporary sealing and uninterrupted water supply during the continued construction of existing drainage culverts as described in claim 9, characterized in that: The bottom of the vertical uprights of the steel pipe support frame is integrally cast into the base plate of the newly built drainage culvert.