JP2013104199A - Intake structure of intake well - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake structure which causes no damage and deformation of a screen due to contact and abrasion of the screen with stone, ballast, and the like in the ground at the time of sinking during installation work of an intake well, and can easily remove clogging even when clogging occurs in a screen slot after using the intake well for a long period of time.SOLUTION: An intake structure of an intake well, in which a water intake port having a predetermined height and width is installed in the circumferential direction of the intake well, includes: a pair of top and bottom flanges (8, 9) which are respectively mounted to the upper and lower end surfaces of the water intake port in the circumferential direction of the intake well; a pair of end surface flanges (10, 11) which are mounted to both circumferential end surfaces of the water intake port; a screen (6) which is fixed to the top and bottom flanges and end surface flanges and formed so as to extend over the whole surface of the water intake port; and a plurality of screen protection pipes (5) which are vertically arranged at predetermined intervals on the radially outside of the intake well of the screen and whose both ends are respectively fixed to the top and bottom flanges.

Description

  The present invention relates to a water intake of a water intake well, and more particularly to a water intake having a predetermined height provided on the entire circumference or a part of the water intake well.

  The intake port generally includes a pair of top and bottom flanges attached to the upper and lower end surfaces in the circumferential direction of the intake well, and a pair of end surface flanges attached to both end surfaces in the circumferential direction of the intake port. A water intake screen is fixed to the bottom flange and the pair of end surface flanges by welding or the like over the entire surface of the water intake.

  When installing a intake well, if the intake well has a relatively small diameter of 2m or less, drill the hole at the depth required to install the intake well and drill the hole into the hole. The wells can be suspended and installed, but if the diameter of the intake well is more than 2m and reaches 10m, the ground below the surface of the groundwater is soft, so when drilling, the excavated hole collapses It is easy and cannot be excavated by boring. Therefore, in order to bury the intake well below the groundwater level, the intake well can be used by using its own weight or by pressurizing the intake well using a machine from the top of the intake well. In general, a method of sinking into the ground to a predetermined depth is used.

  When installing a relatively large-diameter intake well in this way, if the intake well is submerged in the ground by its own weight or injection, the intake screen attached to the intake port There is a risk of damage or deformation due to contact with gravel and rubbing.

  Another problem with such intake wells is that when a screen made of a spiral or straight wedge wire is used as a screen, for example, as shown in Patent Document 1, gravel and waste in groundwater can be used during a long period of use. Sand or the like enters the slots between the wedge wires of the screen, resulting in clogging and deterioration of the water collecting efficiency of the screen. In such a case, the water intake must be stopped once, and the worker must enter the water intake well to clean the screen to remove the clogging, which is extremely troublesome.

JP 2003-314183 A

  The present invention has been considered in consideration of the problems of the conventional intake well intake structure described above, and the screen touches and rubs stones, gravel, etc. in the ground during subsidence during the installation work of the intake well. It is intended to provide a water intake structure that does not cause damage or deformation.

  Another object of the present invention is to use the intake well for a long period of time, so that even if clogging occurs in the slot of the screen due to gravel or dust, such a clogging structure can be easily removed. Is to provide.

  A first structure of a water intake well structure that achieves the object of the present invention is a water intake having a predetermined height provided on the entire circumference of the water intake well or a part thereof, and above and below the water intake. A pair of top and bottom flanges attached to the end face in the circumferential direction of the intake well; a pair of end face flanges attached to both end faces in the circumferential direction of the intake; the pair of top and bottom flanges; and the pair of end faces The screen is fixed to the flange and provided over the entire surface of the water intake, and the screen is disposed vertically outside the water intake well in the radial direction at predetermined intervals. Both ends are fixed to the top and bottom flanges, respectively. And a plurality of screen protection pipes.

  In the second configuration of the present invention, in addition to the first configuration, the screen is disposed in the vertical direction at a predetermined interval inside the intake well in the radial direction of the screen, and both ends are fixed to the top and bottom flanges, respectively. A plurality of backwashing pipes each having a plurality of backwashing fluid outlets that open toward the screen at predetermined intervals in the vertical direction, and a backwashing pipe disposed radially inside the intake well, A backwashing fluid supply pipe connected to the fluid tank, the backwashing fluid supply pipe and the backwashing pipe connected to each other, and the backwashing fluid supply pipe and each backwashing pipe communicating with each other. And a connecting pipe.

  According to a third configuration of the present invention, in addition to the first configuration, the plurality of screen protection pipes are each formed with a plurality of backwash fluid jets that open toward the screen at predetermined intervals in the vertical direction. The intake structure is disposed radially inside the intake well of the screen protection pipe and connected to a backwash fluid tank, the backwash fluid supply pipe, and the screen Each of the protection pipes is further connected to each other, and the backwashing fluid supply pipe is connected to each screen protection pipe.

  According to the first configuration of the present invention, the water intake structure is arranged in the vertical direction at a predetermined interval on the radially outer side of the intake well of the screen, and both ends are fixed to the top and bottom flanges, respectively. Since there are multiple screen protection pipes, when subsidence during installation work of intake wells, stones and gravel in the ground come into contact with these screen protection pipes, and the screen directly touches the stones and gravel in the ground. Contact and rubbing can be prevented, and damage and deformation of the screen can be prevented.

  According to the second configuration of the present invention, in addition to the first configuration, the water intake structure is disposed vertically in the intake well radial direction inside the screen at a predetermined interval from each other, and the both end portions are the top portions. And a plurality of backwash pipes formed with a plurality of backwash fluid jets which are fixed to the bottom flange and open to the screen at predetermined intervals in the vertical direction, and the intake wells radially inside the backwash pipe The backwashing fluid supply pipe connected to the backwashing fluid tank is connected to each of the backwashing fluid supply pipe and the backwashing pipe, and the backwashing fluid supply pipe and each backwashing pipe are connected to each other. In addition, when the screen slot is clogged, backwash fluid such as backwash water or air is supplied from the backwash fluid tank. Supply from the pipe to each backwash pipe via the connecting pipe, By ejected toward the screen from the wash fluid spout can remove clogging of the screen slots.

  According to a third configuration of the present invention, in addition to the first configuration, the plurality of screen protection pipes each have a plurality of backwashing openings that open toward the screen at predetermined intervals in the vertical direction. A fluid jet outlet is formed, and the intake structure is arranged inside the intake well in the radial direction of the screen protection pipe, and is connected to the backwash fluid tank, and the backwash fluid supply pipe Are connected to each of the screen protection pipes and a connection pipe for connecting the backwash fluid supply pipe and each of the screen protection pipes, so that when the screen slot is clogged, backwashing is performed. Backwashing fluid such as water or air for backwashing is supplied from the fluid tank for backwashing to each screen protection pipe through the connection pipe from the backwashing fluid supply pipe, and from the backwashing fluid outlet of each screen protection pipe. Sk By ejected toward the over emissions, it is possible to remove the clogging of the screen slots.

  According to the third configuration of the present invention, since the screen protection pipe is used as the backwash pipe, it is possible to omit the separate arrangement of the backwash pipe, and the labor and cost for installing the backwash pipe Can be omitted.

It is a front view which shows one embodiment of the intake structure of the intake well which concerns on this invention. It is an AA arrow line view of FIG. It is an enlarged front view of a water intake structure, the left half of the figure shows its outer surface, and the right half of the figure shows its inner surface. FIG. 4 is a plan view with the top flange removed in FIG. 3. It is a BB arrow line view in FIG. It is CC arrow line view in FIG. It is explanatory drawing which shows the detail of a screen, (a) is a front view, (b) is a top view. FIG. 6 is a DD arrow view in FIG. 4. It is a figure which shows arrangement | positioning of the backwash water spout of a backwash pipe. It is a top view similar to FIG. 4 which shows other embodiment of the intake structure of the intake well which concerns on this invention. It is an enlarged view of the F section in FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2, the intake well 1 having an elliptical cross section is formed into a cylindrical shape having an elliptical cross section made of a material such as concrete or steel, and a water intake 2 having a substantially rectangular shape in front view is provided at the lower part thereof. . Reference numeral 4 denotes an intermediate lap used by an operator during construction. In the present embodiment, the water intake is formed at a predetermined height in a part of the circumference of the water intake well, but may be formed over the entire circumference of the water intake well. The diameter of the intake well 1 is normally 2 m to 10 m, but is not limited thereto.

  As shown in FIG. 3, the intake port 2 is provided with a screen protection pipe 5, a screen 6, and a backwash pipe 7 as viewed from the outside to the inside of the intake well.

  A pair of top and bottom flanges 8 and 9 are attached to the upper and lower end surfaces of the intake port 2 in the circumferential direction of the intake well, and a pair of end surface flanges 10.11 are arranged in the vertical direction on both end surfaces in the circumferential direction of the intake port. It is attached. Each flange 8, 9, 10, 11 is attached to the intake wall surface of the intake well 1 by a plurality of anchor bolts 17 (see FIG. 6). A screen 6 provided over the entire surface of the water intake port is fixed to the pair of top and bottom flanges 8 and 9 and the pair of end surface flanges 10 and 11 by means such as welding.

  In the present embodiment, the screen 6 is arranged in parallel so that a plurality of linear wedge wires 13 as shown in FIG. What welded to the orthogonal | vertical rod 20 is used. The arrangement direction of the linear wedge wire 13 may be either the vertical direction or the horizontal direction. In the illustrated embodiment, the linear wedge wires 13 are arranged in the horizontal direction.

  A plurality of screen protection pipes 5 are vertically arranged at predetermined intervals mutually outside the intake well in the radial direction of the screen 6, and both ends are fixed to the top and bottom flanges 8 and 9 by means such as welding, respectively. Yes. The protective pipe 5 is preferably made of steel, alloy steel or the like, and has sufficient strength that it does not easily deform even when it comes into contact with stones, gravel, etc. when the intake well is subsidized.

  Although the outer diameter of the screen protection pipe 5 is 10 to 25 mm, it is not limited to this. The installation interval of the screen protection pipe 5 is usually determined within the range of 50 mm to 100 mm, taking into consideration that the aperture ratio of the screen 6 does not decrease.

  As a member used to protect the screen against external stones and gravel, it is possible to use a rod-shaped member such as a steel bar or an alloy bar instead of the screen protection pipe 5, but the steel is strong in strength. It is preferable to use a pipe having a strength equal to or higher than that of a rod and having a material cost lower than that of a rod.

  Inside the intake well in the radial direction of the screen 6, a plurality of backwash tubes 7 are vertically arranged at predetermined intervals. Both end portions of each backwash tube 7 are fixed to the top and bottom flanges 8 and 9 by means such as welding. Each backwash tube 7 is formed with a plurality of backwash fluid ejection ports 7a that open toward the screen 6 at predetermined intervals in the vertical direction. Further, the backwash fluid supply pipe 12 is disposed at the upper side of the water intake 2 on the inner side in the intake well radial direction of the backwash pipe 7, and the bent both ends 12 a and 12 a are connected to the backwash fluid tank 19 through the pipe 18. It is connected. A connecting pipe 15 is provided between the backwashing fluid supply pipe 12 and the backwashing pipe 7. The connecting pipe 15 connects the backwashing fluid supply pipe 12 and the backwashing pipe 7 so that the backwashing fluid supply pipe 12 and each backwashing pipe 7 communicate with each other.

  As shown in FIG. 8, the screen 6 is a plate-like reinforcing rib which is arranged at an appropriate interval in the vertical direction and extends between the flanges 10, 11 and is welded to the rod of the screen 6 and the backwash tube 7 at both ends. 14 is supported.

As shown in FIG. 9, the backwash fluid outlet 7 a of each backwash pipe 7 is not flush with the adjacent backwash pipe 7 but is arranged in a staggered manner. It is preferable for spraying the screen 6 uniformly.
As the backwash fluid, any of air, water, or a mixed flow of air and water can be used.

Next, the operation of the water intake structure having the above configuration will be described.
During normal water intake after installation of the intake well 1, a pump (not shown) installed in the trap 4 of the intake well 1 is driven, and water flowing into the intake well 1 from the outside through the intake port 2 is driven. Pump up and take out.

  When clogging due to gravel, dust, sand, etc. occurs in the slots between the wedge wires 13 of the screen 6 by continuing water intake for a long period of time, backwash fluid is supplied from the backwash fluid tank 19. It flows into the backwash pipe 7 through the pipe 12 and is ejected from the backwash fluid jet outlet 7 a of each backwash pipe 7 toward the screen 6. As a result, clogging due to gravel or dust between the wedge wires 13 of the screen 6 is removed. At this time, the water in the intake well 1 becomes temporarily turbid water, so normal water intake is interrupted during this period. However, if the backwashing operation is completed and the backwashing fluid is stopped, Can also be completed and returned to normal water intake.

  Next, with reference to FIG. 10, other embodiment of the intake structure of the intake well which concerns on this invention is described. 10, the same components as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  This embodiment differs from the embodiment of FIG. 4 in that the backwash pipe 7 as in the embodiment of FIG. 4 is not provided and the screen protection pipe 5 has a function as a backwash pipe.

  That is, each of the plurality of screen protection pipes 5 is formed with a plurality of backwash fluid jets that open toward the screen 6 at predetermined intervals in the vertical direction. It is preferable that the backwashing fluid outlets of each protection pipe 5 are arranged in a staggered manner between adjacent protection pipes 5. The backwashing fluid supply pipe 12 is disposed on the inner side in the intake well radial direction of the screen protection pipe 5 at the upper part of the water intake 2, and is connected to a backwashing fluid tank 19 through a pipe 18. As shown in FIG. 11, the backwash fluid supply pipe 12 and each screen protection pipe 5 are connected by a connection pipe 15 similar to the connection pipe 15 shown in FIG.

  When clogging occurs in the slot between the wedge wires 13 of the screen 6, the backwash fluid is supplied from the backwash fluid tank 19 to the screen protection pipes 5 from the backwash fluid supply pipe 12 via the connecting pipes. The clogging of the screen slot can be removed by ejecting the screen protection pipe 5 from the backwashing fluid ejection port toward the screen.

Claims (3)

A water intake having a predetermined height provided on the entire circumference or a part of the water intake well,
A pair of top and bottom flanges attached in the circumferential direction of the intake well to the upper and lower end surfaces of the intake;
A pair of end face flanges attached to both end faces in the circumferential direction of the water intake;
A screen fixed to the pair of top and bottom flanges and the pair of end surface flanges and provided over the entire surface of the water intake;
A plurality of screen protection pipes arranged vertically at predetermined intervals from each other on the radially outer side of the screen, and having both ends fixed to top and bottom flanges, respectively. Intake structure. A plurality of openings arranged in the up-down direction at predetermined intervals mutually inside the intake well in the radial direction of the screen, both ends are fixed to the top and bottom flanges, respectively, and open toward the screen at predetermined intervals in the vertical direction. A plurality of backwash pipes formed with a backwash fluid ejection port,
A backwashing fluid supply pipe disposed radially inward of the backwashing pipe and connected to a backwashing fluid tank;
2. The backwashing fluid supply pipe and the backwashing pipe are connected to each other, and the backwashing fluid supply pipe and the backwashing pipe are in communication with each other. Intake well intake structure. The plurality of screen protection pipes are formed with a plurality of backwash fluid jets that open toward the screen at predetermined intervals in the vertical direction,
The water intake structure is disposed on the radially inner side of the water intake well of the screen protection pipe, and is connected to a backwash fluid tank.
2. The backwashing fluid supply pipe and the screen protection pipe are connected to each other, and the backwashing fluid supply pipe and the screen protection pipe are in communication with each other. Intake well intake structure.

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