[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0030] in figure 1 and figure 2 Among them, the water intake well 1 with an elliptical cross section is formed of a material such as concrete or steel into a cylindrical shape with an elliptical cross section, and a water intake 2 having a substantially rectangular front view is provided at the lower part. Mark 4 is the middle gangway used by the operator during construction. In this embodiment, the water intake is formed at a predetermined height on a part of the peripheral surface of the water intake well, but it may be formed over the entire circumference of the water intake well. The diameter of the water intake well 1 is usually 2 to 10 m, but it is not limited to this.
[0031] Such as image 3 As shown, when viewed from the outside to the inside of the water intake well, the water intake 2 is equipped with a filter protection tube 5, a filter 6, and a backwash tube 7.
[0032] On the upper and lower end surfaces of the water intake 2, a pair of top and bottom flanges 8, 9 are installed in the circumferential direction of the water intake well, and a pair of end flanges 10, 9 are installed in the vertical direction on both ends of the water intake in the circumferential direction. 11. Each flange 8, 9, 10, 11 passes through a plurality of anchor bolts 17 (refer to Image 6 ) And installed on the water intake wall of the water intake well 1. On the pair of top and bottom flanges 8 and 9 and the pair of end face flanges 10 and 11, a filter 6 installed over the entire surface of the water intake is fixed by welding or the like.
[0033] As the filter 6, in this embodiment, the Figure 7 The linear wedge wire 13 as shown is a component obtained by arranging a plurality of slits with a predetermined width between each other in parallel and welding them to a rod 20 orthogonal to the linear wedge wire at appropriate intervals . The arrangement direction of the linear wedge wire 13 may be any one of the vertical direction and the horizontal direction. In the illustrated embodiment, the linear wedge wire 13 is arranged in the horizontal direction.
[0034] On the outer side of the filter 6 in the radial direction of the water intake well, a plurality of filter protection tubes 5 are arranged at predetermined intervals in the vertical direction, and their ends are fixed to the top and bottom flanges 8, 9 respectively by welding or the like. on. It is desirable that the protective tube 5 be made of steel, alloy steel, etc., have high strength, and have sufficient strength that it is not easily deformed even when it comes into contact with rocks, gravel, etc. when the water intake well sinks.
[0035] The filter protection tube 5 uses a tube having an outer diameter of 10 to 25 mm, but it is not limited to this. In addition, the installation interval of the filter protection tube 5 is usually in the range of 50 mm to 100 mm, which is determined in consideration of not reducing the aperture ratio of the filter 6.
[0036] As a member used to protect the filter from external stones and gravel, it is also possible to use a rod-shaped member such as a steel rod or an alloy rod instead of the filter protection tube 5, but it is preferable to use a rod-shaped member having the same strength as A steel rod with the same strength or higher and the material cost is cheaper than the rod.
[0037] A plurality of backwash pipes 7 are arranged in the vertical direction at predetermined intervals on the inner side in the radial direction of the water intake well of the filter 6. Both ends of each backwash tube 7 are fixed to the top and bottom flanges 8, 9 respectively by welding or the like. Each backwashing pipe 7 is formed with a plurality of backwashing fluid ejection ports 7a opening to the filter 6 at predetermined intervals in the vertical direction. In addition, the fluid supply pipe 12 for backwashing is arranged at the upper part of the water intake 2 on the radially inner side of the water intake well of the backwashing pipe 7, and its bent ends 12a, 12a are connected to the fluid container 19 for backwashing via the pipe 18 on. A connecting pipe 15 is provided between the backwashing fluid supply pipe 12 and the backwashing pipe 7. The connecting pipe 15 is a pipe that connects the backwashing fluid supply pipe 12 and the backwashing pipe 7 to communicate the backwashing fluid supply pipe 12 and the backwashing pipe 7.
[0038] Such as Figure 8 As shown, the filter 6 is supported by a plate-shaped reinforcing rib 14, which is arranged at appropriate intervals in the vertical direction and extends between the flanges 10 and 11, and the two ends are welded to the filter 6 Rod and backwash tube 7 on.
[0039] Such as Picture 9 As shown, the backwashing fluid ejection ports 7a of each backwashing tube 7 are not on the same plane between the adjacent backwashing tubes 7, but are arranged in a staggered manner. This arrangement makes the backwashing fluid uniform. Ground spraying to the filter 6 is preferable.
[0040] As the fluid for backwashing, any of air, water, or a mixed flow of air and water can be used.
[0041] Next, the operation of the water intake structure of the above-mentioned structure will be described.
[0042] When normal water intake is performed after the intake well 1 is installed, a pump (not shown) installed on the gangway 4 etc. of the intake well 1 is driven to pump up and remove the water flowing into the intake well 1 from the outside through the intake port 2. To the outside.
[0043] In the case where clogging caused by grit, garbage, sand, etc. occurs in the slits between the wedge wires 13 of the filter 6 due to the continuous long-term water intake, the backwashing fluid is passed from the backwashing fluid container 19 through the reverse The washing fluid supply pipe 12 flows into the backwashing pipe 7, and the backwashing fluid is ejected from the backwashing fluid ejection port 7 a of each backwashing pipe 7 to the filter 6. As a result, the clogging between the wedge wires 13 of the filter 6 caused by grit, garbage, etc. is removed. At this time, the water in the intake well 1 becomes turbid temporarily, so the normal intake of water is interrupted during this period. However, when the backwashing operation is completed and the spraying of the backwashing fluid is stopped, the outflow of the turbid water is also terminated, and the normal recovery is possible. Of water.
[0044] Next, refer to Picture 10 Other embodiments of the intake structure of the intake well of the present invention will be described. in Picture 10 In, for and Figure 4 The same constituent elements are denoted by the same symbols, and detailed descriptions are omitted.
[0045] In this embodiment, in the following respects Figure 4 The implementation is different, that is, this implementation does not set Figure 4 The backwash pipe 7 as in the embodiment described above has the filter protection pipe 5 functioning as a backwash pipe.
[0046] That is, the plurality of filter protection tubes 5 are respectively formed with a plurality of backwashing fluid ejection ports opening to the filter 6 at predetermined intervals in the vertical direction. Preferably, the backwashing fluid ejection port of each protection tube 5 and the adjacent protection tube 5 are arranged in a staggered manner. The fluid supply pipe 12 for backwashing is arranged at the upper part of the water intake 2 on the inner side in the radial direction of the water intake well of the filter protection pipe 5, and is connected to the fluid container 19 for backwashing via a pipe 18. Such as Picture 11 As shown, the backwashing fluid supply pipe 12 and each filter protection pipe 5 pass through and Figure 4 The connecting pipe 15 shown is connected to the same connecting pipe 15.
[0047] When clogging occurs in the slits between the wedge-shaped wires 13 of the filter 6, the backwashing fluid is supplied from the backwashing fluid container 19 through the backwashing fluid supply pipe 12 and supplied to each filter through the connecting pipe. In the filter protection tube 5, the backwashing fluid is ejected from the backwashing fluid ejection port of each filter protection tube 5 to the filter, thereby making it possible to remove the clogging of the filter slit.
