Water taking and grit removal structure for urban river in limited space

Abstract

The utility model relates to the field of city river course engineering, especially to a water taking and sand setting structure of limited space city river course which can effectively reduce the river bank land occupation area of one side of river course, including respectively setting in the original embankment and the reconstruction embankment of river course both sides, the original embankment and the reconstruction embankment between being provided with water taking structure, including sand setting pool, sand setting pool and water taking structure intercommunication setting, water taking structure setting in the river course below, sand setting pool setting in the reconstruction embankment below. The utility model is especially applicable to the water taking and sand setting construction in the limited space city river course.

Description

Technical Field

[0001] This utility model relates to the field of urban river engineering, and in particular to a water intake and sedimentation structure for urban rivers in a limited space. Background Technology

[0002] Urban rivers with limited space refer to river sections that flow through existing urban areas, where buildings are densely packed on both banks, municipal pipelines are complex, and the available land space (including riverbanks, beaches, and channels) for new or expanded water conservancy projects is severely restricted. Their main characteristics include a fixed flood discharge section, strict shoreline control, and extremely high land acquisition and demolition costs. The reason for the formation of urban rivers with limited space is that, with the acceleration of urbanization, many rivers that were originally located in the suburbs have been incorporated into urban built-up areas and become urban waterways. These waterways often serve multiple functions, including ecological landscaping, flood control and drainage, and providing water for urban environmental use (such as greening irrigation, road cleaning, and park water supply).

[0003] Among them, such as Figure 7 As shown, water intake through urban waterways in limited spaces faces the following limitations: To reduce sediment load during intake, sedimentation tanks are needed to remove heavier particles, such as sediment, using gravity settling. Existing sedimentation tanks are located on the riverbank, drawing water from the waterway through an intake structure. However, these tanks require a large area, contradicting the extremely limited and valuable land space near the waterway. This results in either severely limited tank size or very high construction costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a water intake and sedimentation structure for urban waterways with limited space that can effectively reduce the land occupation area on one side of the riverbank.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a water intake and sedimentation structure for urban river channels in a limited space, including original embankments and reconstructed embankments respectively set on both sides of the river channel, a water intake structure including a sedimentation tank between the original embankments and the reconstructed embankments, the sedimentation tank being connected to the water intake structure, the water intake structure being set below the river channel, and the sedimentation tank being set below the reconstructed embankment.

[0006] Furthermore, the water intake structure, sedimentation basin, and reconstructed dike are integrated into a single cast-in-place structure.

[0007] Furthermore, the reconstruction of the embankment includes retaining walls and a base. The base and the top of the sedimentation tank are an integral cast-in-place structure, and the retaining walls are set vertically on the base.

[0008] Furthermore, the base includes a toe plate end on the river-facing side and a heel plate end on the backwater side, with a retaining wall set between the toe plate end and the heel plate end. A road is provided on the backwater side of the retaining wall, and the road is located above the heel plate end.

[0009] Furthermore, the water intake structure includes a filter layer, which is disposed at the water inlet of the water intake structure.

[0010] Furthermore, the water intake of the water intake structure is located at the bottom of the river channel.

[0011] Furthermore, the filter layer includes dry-laid stone gabions and graded filter material gabions stacked one on top of the other, with the graded filter material gabions positioned below the dry-laid stone gabions.

[0012] Furthermore, the water intake structure includes an outlet corridor that is connected to the sedimentation tank. The bottom of the outlet corridor is a drainage slope, and the drainage direction of the drainage slope is towards the sedimentation tank.

[0013] Furthermore, it includes a sand flushing pipe, which is installed at the bottom of the sedimentation tank along the water flow direction, with the outlet of the sand flushing pipe facing the downstream direction of the water flow.

[0014] Furthermore, it includes an inspection hole, which is set vertically and whose bottom is connected to the sedimentation tank. At least part of the sidewall of the inspection hole is an integral cast-in-place structure with the reconstructed embankment.

[0015] The beneficial effects of this utility model are: I. By integrating the water intake structure and sedimentation tank into the bank slope section of the reconstructed embankment, a vertical functional layout is achieved. Compared to the existing horizontal layout, this scheme places the water intake structure and sedimentation tank in the river channel and below the reconstructed embankment, greatly reducing the land area occupied on one side of the river channel. At the same time, it also allows for the placement of a larger-scale sedimentation tank, thereby improving the scale and efficiency of water intake and purification.

[0016] Second, by utilizing the existing cast-in-place structure of the reconstructed embankment to form the cavities required for the water intake structure and sedimentation basin, an integrated structure of the water intake structure, sedimentation basin, and reconstructed embankment is created. This integrated composite structure, sharing foundations, side walls, and mutual support, not only further reduces the occupation of underground space but also creates a more stable overall structure among the water intake structure, sedimentation basin, and reconstructed embankment. At the same time, the integrated structure construction plan also significantly reduces construction costs.

[0017] Third, in actual use, the river water enters through the water intake structure below the river channel, then filters out the silt through the sedimentation tank, and then discharges through the water intake pipe. The entire hydraulic process is compactly integrated into the integrated structure consisting of the water intake structure, sedimentation tank, and reconstructed embankment, which can improve the efficiency of water filtration and meet the demand for large-volume water intake.

[0018] Fourth, the outlet of the sand flushing pipe faces the downstream direction of the water flow, which can conveniently discharge the sedimentation tank into the river, achieving efficient cleaning of the sedimentation tank and reducing the difficulty and cost of dredging and maintenance.

[0019] V. The scheme of setting the water intake structure below the river channel, compared to Figure 7 Given the existing situation where the water intake protrudes into the river channel and narrows the flood discharge section, the water intake structure of this scheme will not affect the flood discharge section. Therefore, the water intake structure of this scheme will not disturb the local flow pattern and will not pose a potential threat to the safety of river flood discharge and the stability of the dikes on both banks.

[0020] VI. The integrated structure formed by the water intake structure, sedimentation basin, and reconstructed dike can significantly reduce the project cycle and cost during actual construction. After construction is completed, the road surface environment on the back side of the reconstructed dike can be quickly restored, greatly improving land use efficiency.

[0021] This invention is particularly applicable to water intake and sedimentation construction in urban waterways with limited space. Attached Figure Description

[0022] Figure 1 This is a top view of one embodiment of the present invention.

[0023] Figure 2 yes Figure 1 AA section view in the image.

[0024] Figure 3 yes Figure 1 BB section view in the middle.

[0025] Figure 4 yes Figure 1 CC section view in the image.

[0026] Figure 5 yes Figure 1 DD section view in the image.

[0027] Figure 6 yes Figure 1 EE section view in the image.

[0028] Figure 7 This is a top view of the existing scheme, in which the sedimentation tank is located on the riverbank on one side of the river.

[0029] The diagram is marked as follows: Original dike 1, supporting corbel 11, steel corbel 12, cross bracing steel pipe 13, I-beam 14, channel steel wedge 15, reconstructed dike 2, retaining wall 21, toe plate end 22, heel plate end 23, road 3, steel sheet pile 4, inspection hole 5, valve well 6, valve 61, water intake structure 7, filter layer 71, water outlet corridor 72, sedimentation tank 8, sand flushing pipe 81, sedimentation tank inner cavity 82, ladder 83, water intake pipe 84, water flow direction 9. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] like Figures 1 to 6 The image shows an embodiment of a water intake and sedimentation structure for urban waterways with limited space. Figure 1 In the diagram, the original dike 1 on the right is set along the water flow direction 9 and will not be altered during the construction of the water intake and sedimentation structure. The dike on the left is also set along the water flow direction 9 and consists of the original dike 1 and the reconstructed dike 2. The reconstructed dike 2 is a newly built dike after a portion of the original dike 1 on the left is demolished during the construction of the water intake and sedimentation structure. The section between the two dikes forms the river channel, while the section to the left of the reconstructed dike 2 forms the riverbank.

[0032] The water intake structure 7 has its inlet located at the bottom of the river channel, with the opening perpendicular to the channel bottom. The inlet opening can be a bottom-grid structure with a depth of 8-12m downstream and 2-3m perpendicular to the water flow. A filter layer 71 is installed within the inlet opening. Filter layer 71 consists of stacked dry-laid stone gabions and graded filter material gabions, with the graded filter material gabions positioned below the dry-laid stone gabions. The dry-laid stone gabions are approximately 20-30cm thick, and the graded filter material gabions are approximately 40-50cm thick. Below the graded filter material gabions is the outlet channel 72. Water in the river channel passes through the dry-laid stone gabions and graded filter material gabions sequentially, filtering out most of the sediment, before flowing into the outlet channel 72. Figure 3 As shown, the bottom of the outlet channel 72 has a drainage slope structure, which facilitates the flow of water from the outlet channel 72 to the sedimentation tank cavity 82 of the sedimentation tank 8 on the right side of the outlet channel 72. The preferred drainage slope is 1:20.

[0033] The sedimentation tank 8 is located entirely below the renovated embankment 2, such as... Figure 3As shown, the preferred water intake structure 7, sedimentation tank 8, and the reconstructed embankment 2 are integrated reinforced concrete structures. Specifically, the base of the reconstructed embankment 2 and the top of the sedimentation tank 8 are integrated reinforced concrete structures. The retaining wall 21 of the reconstructed embankment 2 is vertically mounted on the base, forming an inverted T-shape. The outer foundation of the sedimentation tank 8 and the water intake structure 7 are integrated reinforced concrete structures. This creates a shared foundation, shared sidewalls, and mutually supporting integrated composite structure. The outlet channel 72 and the sedimentation tank cavity 82 are connected and located within the aforementioned integrated composite structure. Furthermore, the integrated composite structure is located at the bottom of the river channel, and most of its structure is located within the riverbed. Figure 3 The space between the original embankment 1 on the left and the reconstructed embankment 2 on the right, as shown, greatly reduces the occupation of the riverbank land on the right side of the reconstructed embankment 2, while the riverbank land on the right side of the reconstructed embankment 2 can be used to build facilities such as roads 3.

[0034] like Figure 1 and Figure 5 In the structure shown, the inspection hole 5 is vertically oriented and has a rectangular cross-section. One wall of the inspection hole 5 is coplanar with the reconstructed embankment 2, further reducing the space occupied by the inspection hole 5 on the riverbank. The bottom of the inspection hole 5 connects to the inner cavity 82 of the sedimentation tank. Ladders 83 are installed on the side walls of both the inspection hole 5 and the inner cavity 82 of the sedimentation tank. These ladders allow maintenance personnel to access the inner cavity 82 from the outside for inspection and cleaning. The flushing pipe 81 is located on the side of the bottom of the inner cavity 82 away from the water intake structure 7. This is because the side of the inner cavity 82 away from the water intake structure 7 accumulates the most impurities, and this design allows for better flushing away of these impurities. The outlet of the flushing pipe 81 faces downstream of the river, allowing impurities to be smoothly discharged along the river's direction. A water intake pipe 84 is connected to the right side of the inner cavity 82 of the sedimentation tank. The water intake pipe 84 is horizontally positioned and passes through a valve well 6. The valve well 6 is located on the side of the inspection hole 5 away from the river channel. A valve 61 is installed in the valve well 6 to control its opening and closing. Water is drawn from the sedimentation tank 8 by opening the valve 61. To enable the sedimentation tank 8 to remove heavier particles from the water using the principle of gravity settling, the inlet of the water intake pipe 84 can be positioned higher than the bottom surface of the inner cavity 82 of the sedimentation tank, thereby achieving the effect of sedimentation and impurity removal.

[0035] The construction process for the water intake sedimentation structure can be carried out according to the following plan: a. Steel sheet pile 4 construction: Based on the river hydrological conditions, select a suitable dry season to construct the steel sheet pile 4 foundation pit cofferdam for the water intake section; b. Diversion: Since urban rivers can be regulated in terms of water volume, and the water volume is small during the dry season, the water intake construction will use water pump drainage diversion or underground culvert diversion in the construction section to create dry construction conditions; c. Demolition of the original embankment 1: Demolish the original embankment 1 on the side of the river with traffic requirements and temporary land use qualifications, reserving an area for the subsequent construction and reconstruction of embankment 2; d. Riverbed clearing: Clear the riverbed foundation; e. Construction of cross bracing steel pipe 13: Support brackets 11 are fixed on the original embankment 1 on the other side of the river channel. The free end of the cross bracing steel pipe 13 is erected on the support bracket 11. The gap between the free end of the cross bracing steel pipe 13 and the original embankment 1 is reinforced with channel steel wedges 15. The fixed end of the cross bracing steel pipe 13 is welded to the sheet pile 4 via I-beams 14. Steel brackets 12 are installed at the bottom of the I-beams 14. One cross bracing steel pipe 13 is laid every 3-5m along the water flow direction 9. f. Foundation excavation: Foundation excavation is carried out in the river channel for the water intake structure 7, sedimentation basin 8, retaining wall 21 of the reconstructed embankment 2, and valve well 6. g. Building pouring: Erect formwork and then pour water intake structure 7, sedimentation tank 8, retaining wall 21 of the reconstructed dike 2, and valve well 6. Water intake pipe 84 and sand flushing pipe 81 are pre-embedded in sedimentation tank 8. Preferably, when pouring retaining wall 21 of the reconstructed dike 2, one side wall of the rectangular inspection hole 5 is poured as an integral structure with retaining wall 21 of the reconstructed dike 2; h. Backfilling and restoration: Backfill and compact the excavated space outside the building. Backfill and compact the backwater side of the reconstructed dike 2 in layers to restore the bank slope landscape or road 3. Then remove the sheet pile cofferdam and restore normal river flow; i. Construction of the water intake structure 7: Dry-laid stone gabions and graded filter material gabions are stacked vertically inside the water intake structure 7. The thickness of the dry-laid stone gabions is 20-30cm, and the thickness of the graded filter material gabions is 40-50cm; j. Equipment installation and commissioning: Install valve 61 and conduct water intake commissioning.

Claims

1. A water intake and sedimentation structure for a confined urban river channel, comprising an original embankment (1) and a reconstructed embankment (2) respectively located on both sides of the river channel, wherein a water intake structure (7) is provided between the original embankment (1) and the reconstructed embankment (2), including a sedimentation tank (8), wherein the sedimentation tank (8) is connected to the water intake structure (7), characterized in that: The water intake structure (7) is located below the river channel, and the sedimentation tank (8) is located below the reconstructed embankment (2).

2. The water intake and sedimentation structure for urban waterways in confined space as described in claim 1, characterized in that: The water intake structure (7), sedimentation tank (8) and the reconstructed dike (2) are an integral cast-in-place structure.

3. The water intake and sedimentation structure for urban waterways in confined space as described in claim 2, characterized in that: The reconstructed embankment (2) includes a retaining wall (21) and a base. The base and the top of the sedimentation tank (8) are an integral cast-in-place structure. The retaining wall (21) is set on the base in a vertical direction.

4. The water intake and sedimentation structure for urban waterways in confined space as described in claim 3, characterized in that: The base includes a toe plate end (22) on the river-facing side and a heel plate end (23) on the back side. A retaining wall (21) is set between the toe plate end (22) and the heel plate end (23). A road (3) is set on the back side of the retaining wall (21) and above the heel plate end (23).

5. The water intake and sedimentation structure for urban waterways in confined space as described in any one of claims 1 to 4, characterized in that: The water intake structure (7) includes a filter layer (71), which is disposed at the water inlet of the water intake structure (7).

6. The water intake and sedimentation structure for urban waterways in confined space as described in claim 5, characterized in that: The water intake of the water intake structure (7) is located at the bottom of the river channel.

7. The water intake and sedimentation structure for urban waterways in confined space as described in claim 6, characterized in that: The filter layer (71) includes dry-laid stone cages and graded filter material cages stacked on top of each other, with the graded filter material cages located below the dry-laid stone cages.

8. The water intake and sedimentation structure for urban waterways in confined space as described in claim 5, characterized in that: The water intake structure (7) includes an outlet channel (72), which is connected to the sedimentation tank (8). The bottom of the outlet channel (72) is a drainage slope, and the drainage direction of the drainage slope is towards the sedimentation tank (8).

9. The water intake and sedimentation structure for urban waterways in confined space as described in any one of claims 1 to 4, characterized in that: Includes a sand flushing pipe (81), which is installed at the bottom of the sedimentation tank (8) along the water flow direction (9), and the outlet of the sand flushing pipe (81) faces the downstream direction of the water flow.

10. The water intake and sedimentation structure for urban waterways in confined space as described in any one of claims 1 to 4, characterized in that: It includes an inspection hole (5), which is set in a vertical direction. The bottom of the inspection hole (5) is connected to the sedimentation tank (8). At least part of the side wall of the inspection hole (5) is an integral cast-in-place structure with the reconstructed embankment (2).

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