River-side radiant well

Abstract

This invention provides a riverside radial well with good anti-siltation effect and longer-term stable water intake, belonging to the field of radial well technology. The riverside radial well includes a collection well, an artificial filter bed installed in the river channel for filtering river water, and a radial pipe for water intake installed on the collection well. The artificial filter bed is enclosed by a retaining wall installed in the river channel, and the retaining wall has multiple river water inlet holes for drawing water into the retaining wall. The elevation of the river water inlet holes is higher than the bottom elevation of the river channel. The artificial filter bed includes, from bottom to top, a sand and gravel base layer, a sand and gravel mixed filter media layer, and a gravel anti-erosion layer. One end of the radial pipe communicates with the inner cavity of the collection well, and the other end is connected to the purified water outlet of a filtration device buried in the sand and gravel mixed filter media layer. This invention significantly extends the service life of the radial well and reduces maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of radiation well technology, specifically a riverside radiation well. Background Technology

[0002] Radial wells typically consist of a large-diameter, vertical collection well and one or more layers of radial pipes extending horizontally or obliquely into the aquifer along the well wall. They are widely used in riverside water sources. This combined vertical and horizontal water collection system can effectively intercept lateral recharge from rivers and groundwater from aquifers, offering advantages such as large water output, stable water quality, and small footprint. It has significant application value in urban water supply, agricultural irrigation, and industrial water use.

[0003] However, river water often contains a large amount of suspended sediment (such as silt, fine sand, and clay particles). When river water seeps into the well area from a radial well along the river, the resulting drop funnel effect causes two types of siltation: First, there is surface siltation. Fine-grained sediment is deposited on the bottom of the riverbed and the surface of the aquifer on the bank slope, forming a low-permeability sediment cap. As the operation time increases, this cap continuously thickens and compacts, and its permeability coefficient can decrease by several orders of magnitude compared to the original riverbed, seriously hindering the overall replenishment of the aquifer by the river.

[0004] Secondly, internal siltation occurs. Some sediment enters the aquifer pores around the radial pipe with the seepage, gradually filling and blocking the pore channels, leading to an irreversible decrease in the local permeability of the aquifer. More importantly, sediment can also directly enter the radial pipe, blocking the filter pores or the wire mesh gaps, and even depositing inside the pipe to form a siltation layer. The radial pipe is the core water collection component of the radial well; once internal siltation occurs, its water collection efficiency will drop sharply, and even if there is sufficient external water, it will not be able to effectively enter the well.

[0005] Under the combined effect of the two types of blockages mentioned above, the actual recharge range of the radial well is reduced, the water collection function of the radial pipe deteriorates, and ultimately the water intake continues to decline. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a riverside radial well with good anti-siltation effect and longer-term stable water intake.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a riverside radial well, including a water collection well, an artificial filter bed set in the river channel for filtering river water, and a water intake radial pipe set on the water collection well; The artificial filter bed is enclosed by a retaining wall set in the river channel. The retaining wall has multiple water inlet holes for drawing water into the retaining wall. The water inlet holes are set at an elevation higher than the bottom elevation of the river channel.

[0008] The artificial filter bed comprises, from bottom to top, a sand and gravel base layer, a sand and gravel mixed filter media layer, and a gravel anti-erosion layer; the particle size of the sand and gravel base layer is 8-32 mm, the particle size of the sand and gravel mixed filter media layer is 4-32 mm, and the particle size of the gravel anti-erosion layer is 100-200 mm. One end of the radiant tube is connected to the inner cavity of the water collection well, and the other end is connected to the purified water outlet of the filter device buried in the sand and gravel mixed filter media layer.

[0009] Furthermore, the thickness of the sand and gravel base layer is 0.15–0.20 m, the thickness of the sand and gravel mixed filter media layer is 1.20–1.50 m, and the thickness of the gravel anti-erosion layer is 0.15–0.20 m.

[0010] Furthermore, it also includes a backwashing system; An on / off control valve is installed on one end of the radiant tube that connects to the inner cavity of the water collection well. The backwashing system is connected to the radiant tube.

[0011] Furthermore, a sedimentation tank is provided between the artificial filter bed and the retaining wall.

[0012] Furthermore, the backflushing system includes an air compressor and an air supply main; The air compressor's outlet is connected to the main air supply pipe, and the radiant pipes are connected in parallel to the main air supply pipe via branch pipes. Each branch pipe is equipped with a backwash control valve to control its on / off state.

[0013] Furthermore, the on / off control valve is a pneumatic control valve, and the control port of the on / off control valve is connected to the air outlet of the air compressor through a water intake control pipe; The water intake control pipe is equipped with a valve to control its on / off state.

[0014] Furthermore, the filtration device includes a tubular body and a sealing part disposed at one end of the body, and the other end of the body is open to form a clean water outlet; The sidewall of the body is provided with multiple filter holes that communicate with its inner cavity, and the porosity of the body is 25% to 30%. The body includes a spiral rib extending spirally along the axis of the body and multiple longitudinal ribs disposed inside the spiral rib and spaced apart circumferentially along the spiral rib; the longitudinal ribs are disposed along the axis of the body. The filter holes are formed by adjacent longitudinal ribs and adjacent spiral ribs. The cross-sections of the spiral ribs and the longitudinal ribs are both isosceles trapezoidal structures, and the long side is located inside the body.

[0015] Furthermore, the diameter of the river water inlet hole is 20-50 mm, and the inlet of the river water inlet hole is at an angle to the direction of the river flow.

[0016] The beneficial effects of this invention are as follows: The radial well of this invention has a water-retaining wall outside the artificial filter bed, and a water inlet hole with an elevation higher than the riverbed is opened on the water-retaining wall, which reduces the introduction of sediment from the source and slows down the formation of a sediment cap layer above the artificial filter bed. The artificial filter bed consists of an 8-32mm sand and gravel base layer, a 4-32mm sand and gravel mixed filter media layer, and a 100-200mm gravel anti-erosion layer, forming a multi-stage reverse filtration structure, which slows down the flow velocity of river water during infiltration and effectively intercepts suspended sediment. In addition, the radial pipe is not directly buried in the natural riverbed, but is connected to the clean water outlet of the filtration device buried in the sand and gravel mixed filter media layer. The filtered clean water enters the radial pipe, avoiding the direct entry of fine particles of sediment into the pipe and causing siltation. Therefore, this invention systematically solves the problem of continuous decline in water intake caused by the thickening of the riverbed silt cover and the blockage inside the radial pipe in existing riverside radial wells. It can maintain high water intake stability in long-term operation, significantly extend the service life of the radial well and reduce maintenance costs. Attached Figure Description

[0017] Figure 1 This is a construction plan of the radial well of the present invention; Figure 2 This is a schematic diagram of the structure of an artificial filter bed; Figure 3 This is a diagram showing the pipeline layout for backflushing. Figure 4 This is a schematic diagram of the backwashing principle; Figure 5 This is a schematic diagram of the filter device; Figure 6 yes Figure 5 The right view; The diagram shows: 1. Water collection well; 2. River channel; 3. Artificial filter bed; 4. Radial pipe; 5. Water retaining wall; 6. Filtration device; 7. Sedimentation tank; 8. Water flow direction; 31. Sand and gravel base layer; 32. Sand and gravel mixed filter media layer; 33. Gravel anti-erosion layer; 41. On / off control valve; 42. Valve; 43. Water intake control pipe; 51. River water inlet; 61. Body; 62. Sealing part; 63. Filter hole; 101. Air compressor; 102. Air transmission main pipe; 103. Branch pipe; 104. Backwash control valve; 611. Longitudinal rib; 612. Spiral rib. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2As shown, the riverside radial well of the present invention includes a water collection well 1, an artificial filter bed 3 installed in a river channel 2 for filtering river water, and a radial pipe 4 for water intake installed on the water collection well 1. The artificial filter bed 3 is enclosed by a retaining wall 5 installed in the river channel, and the retaining wall 5 has multiple water inlet holes 51 for drawing water into the retaining wall 5. The artificial filter bed 3 includes, from bottom to top, a sand and gravel base layer 31, a sand and gravel mixed filter media layer 32, and a gravel anti-erosion layer 33; the particle size of the sand and gravel base layer 31 is 8-32 mm, the particle size of the sand and gravel mixed filter media layer 32 is 4-32 mm, and the particle size of the gravel anti-erosion layer 33 is 100-200 mm. One end of the radial pipe 4 is connected to the inner cavity of the water collection well 1, and the other end is connected to the purified water outlet of the filter device 6 buried in the sand and gravel mixed filter media layer 32.

[0020] The retaining wall serves to intercept river flow, preventing direct erosion of the enclosed area. The height of the retaining wall is typically set according to the river's highest summer water level. The function of the river water inlet 51 is to introduce river water from outside the retaining wall into its interior. To reduce the amount of sediment entering the retaining wall through the river water inlet 51, its elevation is higher than the bottom elevation of the river channel. The river water inlet 51 is positioned above the river channel bottom. To ensure water flow even during the dry season, it is understood that the river water inlet 51 should be located below the lowest water level of the river channel.

[0021] The inlet orientation of the river water inlet 51 can be the same as or at an angle to the river flow direction 8, and the orifice diameter can be set as needed. In this invention, the orifice diameter of the river water inlet 51 is preferably 20-50 mm, and the inlet orientation of the river water inlet 51 is at an angle to the river flow direction 8. The angle between the inlet orientation of the river water inlet 51 and the river flow direction 8 is preferably 45°-90°. The above structure can further reduce the amount of sediment carried by the river water when it enters the retaining wall from the river water inlet 51. In this invention, the specific number of river water inlets 51 is determined according to parameters such as the designed output of the collection well 1 and the orifice diameter of the river water inlet 51. That is, the designed number of river water inlets 51 should meet the designed output requirements of the collection well 1.

[0022] The radial well of this invention features a retaining wall outside the artificial filter bed, with water inlet holes on the retaining wall at an elevation higher than the riverbed. This reduces the introduction of sediment at the source and slows the formation of a sediment cap layer above the artificial filter bed. The artificial filter bed, from bottom to top, consists of an 8-32mm sand and gravel base layer, a 4-32mm sand and gravel mixed filter media layer, and a 100-200mm gravel erosion control layer, forming a multi-stage reverse filtration structure. The gravel erosion control layer has a larger particle size, which can resist water flow impact and prevent filter media loss. The sand and gravel base layer, with a particle size of 8-32mm, can evenly support the filter media above, preventing it from sinking or being lost. It also serves to secondary intercept residual sediment and distribute water evenly, making it a crucial foundation layer for ensuring the long-term stability of the artificial filter bed structure and the continuous effectiveness of its filtration function. This artificial filter bed slows down the flow velocity of river water during infiltration, effectively trapping suspended sediment. Furthermore, the radial pipe is not directly buried in the natural riverbed, but is connected to the clean water outlet of a filtration device buried within a layer of sand and gravel filter media. The filtered clean water enters the radial pipe, preventing fine particles of silt from directly entering and causing blockages. Therefore, this invention systematically solves the problem of continuously decreasing water intake caused by thickening of the riverbed silt cover and blockages inside the radial pipe in existing riverside radial wells. It maintains high water intake stability even during long-term operation, significantly extending the service life of the radial well and reducing maintenance costs.

[0023] Based on the characteristics of the river water, and to ensure filtration effectiveness while saving construction costs, practical experience has shown that the optimal thickness of the sand and gravel base layer 31 is 0.15–0.20 m, the particle size of the sand and gravel mixed filter media layer 32 is 1.20–1.50 m, and the particle size of the gravel erosion control layer 33 is 0.15–0.20 m. This artificial filter bed can guarantee both filtration efficiency and permeability that meets the water supply requirements of the collection well. It can be used for river water with turbidity greater than 50 NTU that cannot be directly used for industrial purposes, and the filtered turbidity is less than 20 NTU.

[0024] The radial well of this invention is also equipped with a backwashing system. The backwashing system can be a water backwashing system or an air backwashing system. An on / off control valve 41 is installed on the end of the radial pipe 4 that connects to the inner cavity of the water collection well 1. The on / off control valve 41 is used to control the connection between the radial pipe 4 and the water collection well 1. The backwashing system is connected to the radial pipe 4. The backwashing system, connected to the radial pipe 4, backwashes the filter device 6 and the artificial filter bed 3 through the radial pipe 4, removing sediments such as mud and silt from the radial pipe, filter device, and artificial filter bed, restoring their permeability, and thus maintaining the water intake of the radial well for a longer period.

[0025] During backwashing, first close the connection between the radiant tube 4 and the collection well 1 using the on / off control valve 41 to prevent backwash water or gas from escaping from the connection between the radiant tube 4 and the collection well 1; then, start the backwashing system to backwash the radiant tube, filter device, and artificial filter bed.

[0026] like Figure 1 As shown, a sedimentation tank 7 is provided between the artificial filter bed 3 and the water retaining wall 5 to settle the mud and sand entering the river water from the river water inlet 51 and the mud and sand generated by backwashing, so as to prevent them from being deposited again on the surface of the artificial filter bed.

[0027] like Figure 3 and Figure 4 As shown in the embodiment of the present invention, the backwashing system is an air backwashing system, including an air compressor 101 and an air supply main 102. The air outlet of the air compressor 101 is connected to the air supply main 102, and the radiant pipes 4 are respectively connected in parallel to the air supply main 102 through branch pipes 103; each branch pipe 103 is provided with a backwashing control valve 104 to control its on / off state.

[0028] When the water intake of the radiant pipe 4 decreases and backwashing is required, the backwash control valve 104 is opened, and the connection between the radiant pipe 4 and the collection well 1 is closed through the on / off control valve 41. Then, the air compressor 101 is started. The high-pressure airflow generated by the air compressor enters the corresponding radiant pipe 4 through the main air supply pipe 102 and the branch pipe 103 to achieve backwashing. The backwashing system adopts an air backwashing system. The friction between the rising air bubbles and the filter media particles, as well as the mutual friction between the filter media, can more effectively remove impurities trapped on the filter media, resulting in a better backwashing effect.

[0029] The on / off control valve 41 can be a manual control valve, a solenoid valve, or a pneumatic control valve. In this embodiment of the invention, the on / off control valve 41 is a pneumatic control valve, and its control port is connected to the air outlet of the air compressor 101 via a water intake control pipe 43; the water intake control pipe 43 is equipped with a valve 42 for controlling its on / off state. When the on / off control valve 41 is a pneumatic control valve, its control port can be one or more, depending on the structure of the on / off control valve. For example, if the on / off control valve is a single-acting pneumatic control valve, it has one control port; if a double-acting pneumatic control valve is used, it has two control ports. In this embodiment of the invention, such as... Figure 4As shown, the on / off control valve 41 is a double-acting pneumatic control valve with two control ports. One port controls its opening, and the other controls its closing. The two on / off control ports are connected to the air outlet of the air compressor 101 via a water intake control pipe 43. When it is necessary to open the on / off control valve 41, high-pressure airflow is introduced into the control port that controls its opening. The high-pressure airflow causes the valve core of the on / off control valve 41 to move and open the valve body. When it is necessary to close the on / off control valve 41, high-pressure airflow is introduced into the control port that controls its closing. The high-pressure airflow causes the valve core of the on / off control valve 41 to move in the opposite direction and close the valve body.

[0030] Filter device 6 can be any existing filter device. For example... Figure 5 and Figure 6 As shown, in this embodiment of the invention, the filtration device 6 includes a tubular body 61 and a sealing portion 62 that seals one end of the body 61. The other end of the body 61 is open to form a purified water outlet. The sidewall of the body 61 has multiple filter holes 63 communicating with its inner cavity, and the porosity of the body 61 is 25%–30%. Further, as… Figure 5 and Figure 6 As shown, the body 61 includes a spiral rib 612 extending spirally along the axis of the body 61 and multiple longitudinal ribs 611 arranged circumferentially and spaced apart inside the spiral rib 612; the longitudinal ribs 611 are arranged along the axis of the body 61; the filter hole 63 is formed by adjacent longitudinal ribs 611 and adjacent spiral ribs 612, and the cross-section of both the spiral rib 612 and the longitudinal ribs 611 is an isosceles trapezoidal structure, with the long side located inside the body 61. Practice shows that the above-mentioned specially designed filter device has good hydraulic conditions, low inlet flow velocity, good sand interception effect on river water, and is not prone to siltation.

[0031] Specifically, in this embodiment of the invention, the long side length of the cross section of the spiral rib 612 and the longitudinal rib 611 is 2.2 mm, the height is 3.5 mm, and the pitch (the distance between adjacent spirals) of the spiral rib 612 is 2 mm.

Claims

1. A river-side radiant well, characterized in that: It includes a water collection well (1), an artificial filter bed (3) set in the river channel for filtering river water, and a water intake radial pipe (4) set on the water collection well (1); The artificial filter bed (3) is enclosed by a retaining wall (5) set in the river channel. The retaining wall (5) has multiple water inlet holes (51) for drawing water into the retaining wall (5). The water inlet holes (51) are set at an elevation higher than the bottom elevation of the river channel. The artificial filter bed (3) includes a sand and gravel base layer (31), a sand and gravel mixed filter media layer (32), and a gravel anti-erosion layer (33) laid from bottom to top; the sand and gravel base layer (31) has a particle size of 8 to 32 mm, the sand and gravel mixed filter media layer (32) has a particle size of 4 to 32 mm, and the gravel anti-erosion layer (33) has a particle size of 100 to 200 mm. One end of the radiant tube (4) is connected to the inner cavity of the water collection well (1), and the other end is connected to the clean water outlet of the filter device (6) buried in the sand and gravel mixed filter media layer (32).

2. The river-side radiant shaft as claimed in claim 1, characterized in that: The thickness of the sand and gravel base layer (31) is 0.15-0.20m, the thickness of the sand and gravel mixed filter material layer (32) is 1.20-1.50m, and the thickness of the gravel anti-erosion layer (33) is 0.15m-0.20m.

3. The river-side radiant shaft as claimed in claim 1, characterized in that: It also includes a backwashing system; A shut-off control valve (41) is installed on one end of the radiant tube (4) that is connected to the inner cavity of the water collection well (1). The backwashing system is connected to the radiant tube (4).

4. The river-side radiation well according to any one of claims 1 to 3, characterized in that: A sedimentation tank (7) is provided between the artificial filter bed (3) and the water retaining wall (5).

5. The river-side radiant shaft as claimed in claim 3, characterized in that: The backwashing system includes an air compressor (101) and an air supply main (102). The air outlet of the air compressor (101) is connected to the main air supply pipe (102), and the radiant pipes (4) are connected in parallel to the main air supply pipe (102) through branch pipes (103); Each branch pipe (103) is equipped with a backwash control valve (104) to control its opening and closing.

6. The river-side radiant shaft according to claim 3, wherein: The on / off control valve (41) is a pneumatic control valve, and the control port of the on / off control valve (41) is connected to the air outlet of the air compressor (101) through the water intake control pipe (43). The water intake control pipe (43) is equipped with a valve (42) to control its opening and closing.

7. The riverside radial well as described in claim 1, characterized in that: The filtration device (6) includes a tubular body (61) and a sealing part (62) that is provided at one end of the body (61), and the other end of the body (61) is open to form a clean water outlet; The sidewall of the body (61) is provided with a plurality of filter holes (63) communicating with its inner cavity, and the porosity of the body (61) is 25% to 30%. The body (61) includes a spiral rib (612) extending spirally along the axial direction of the body (61) and a plurality of longitudinal ribs (611) disposed inside the spiral rib (612) and spaced apart circumferentially along the spiral rib (612); the longitudinal ribs (611) are disposed along the axial direction of the body (61). The filter hole (63) is formed by the adjacent longitudinal ribs (611) and the adjacent spiral ribs (612). The cross-sections of the spiral ribs (612) and the longitudinal ribs (611) are both isosceles trapezoidal structures, and the long side is located inside the body (61).

8. The riverside radial well as described in claim 1, characterized in that: The diameter of the river water inlet hole (51) is 20-50 mm, and the inlet of the river water inlet hole (51) is at an angle to the direction of the water flow in the river.

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