JP2014009567A - Clogging removal device for infiltration gallery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clogging removal device for an infiltration gallery, which can recover water intake quantity by eliminating clogging of the infiltration gallery using a simple device, without use of a large-scale civil-engineering repair method.SOLUTION: The clogging removal device for the infiltration gallery includes a plurality of porous flush pipes (2) which are provided in gravel strata (11 and 12) on the upside of a water collecting pipe (1) and are supplied with compressed air from compressed air supply means and in which a plurality of air ejection holes for ejecting the supplied compressed air are formed.

Description

  The present invention relates to an apparatus for removing clogging of a gravel layer on the upper side of a water collecting burial made of a steel pipe or the like for taking water in a river, pond, lake, dam, coast or the like.

  As a method of taking underground water or groundwater, there is a water collecting burial in which a water collecting pipe formed of a screen pipe, a perforated pipe, reinforced concrete, or the like is buried under the riverbed of the river bed.

  The water collecting burial is buried with a gravel layer having a predetermined particle diameter and a gravel layer whose particle diameter is gradually reduced toward the upper side thereof spread to a predetermined depth.

  The problem of catchment burial is that mud and fine sand flowing in the river accumulates in the gravel layer of the catchment burial while continuing to take water, causing clogging. The amount of water intake is gradually decreasing. In order to eliminate such clogging, in the conventional method, when the water level of the river is low, a heavy construction machine digs up the gravel layer and cleans it by washing away the accumulated sediment or replacing the gravel layer itself However, there was no simple method that could be used for daily maintenance.

  The present invention is based on the above-mentioned problems of the conventional water catchment burial, and it eliminates clogging of the water catchment burial with a simple device regardless of the large-scale civil engineering repair method. It is an object of the present invention to provide a clogging removing device for collecting water burial that can recover the water.

  In order to achieve the above-mentioned object of the present invention, the present applicant has conducted intensive research and development. As a result, when embedding the water catchment, the applicant has a porous hole having an air ejection hole in the gravel layer above the water catchment. We arrived at the present invention by finding out that clogging can be easily removed with a simple device by adding a cleaning pipe and blowing out air from the cleaning pipe when clogging occurs due to sediment accumulated in the gravel layer. did.

  That is, the clogging removal device for a water collecting burial that achieves the object of the present invention described above is such that compressed air is supplied from the compressed air supply means into the gravel layer on the upper side of the water collecting burial, and the supplied compressed air is supplied. It is characterized by comprising a plurality of perforated cleaning tubes in which a plurality of air ejection holes for ejecting water are formed.

  According to the present invention, the clogging removal device includes a plurality of air ejection holes for supplying compressed air from the compressed air supply means into the gravel layer on the upper side of the water collecting burial and ejecting the supplied compressed air. By providing the plurality of formed porous cleaning tubes, when clogging occurs, compressed air is supplied to the plurality of porous cleaning tubes by the compressed air supply means, and air is ejected from these porous cleaning tubes. Thus, the clogging of the water collecting burial can be solved and the water intake can be recovered with a simple device regardless of a large-scale civil engineering repair method.

It is radial direction sectional drawing and a section perspective view of a water collection pipe which show one embodiment of a clogging removal device for water collection embeddings of the present invention. It is the side view and top view which show a part of the water collection pipe | tube and porous washing pipe | tube used for embodiment of FIG. It is the side view and radial direction sectional view which expand and show a part of porous washing tube.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows one preferred embodiment of the clogging removal device for water collecting buried according to the present invention, wherein (a) is a sectional view in the radial direction of the collecting pipe, and (b) is a sectional perspective view. .

  In the present embodiment, the water collecting pipe 1 constituting the water collecting buried is composed of the screen pipe shown in FIG. 2, and the water collecting pipe 1 is buried in the water collecting buried burying portion 10.

  The water collecting buried portion 10 is provided over the entire length of the water collecting pipe 1 so as to cover the water collecting pipe 1, and a large gravel layer in which relatively large diameter gravel is spread from the bottom to the top. 11. A medium gravel layer 12 in which gravel having a smaller diameter than that of a large gravel layer is laid, a small gravel layer 13 in which gravel having a diameter smaller than that of a medium gravel layer and a sand layer 14 are laid in an inverted pyramid shape. The water pipe 1 is embedded in the large gravel layer 11.

  The upper surface 14 a of the sand layer 14 is a river bed, and the water of the river 15 permeates the buried portion 10 to become underground water and is taken through the screen of the water collecting pipe 1.

  The porous cleaning pipe 2 constituting the main part of the clogging removing apparatus of the present invention extends above the water collecting pipe 1 and in parallel with the water collecting pipe 1 at the interface between the large gravel layer 11 and the middle gravel layer 12 of the buried part 10. To be installed. 2A and 2B show a part of the water collecting pipe 1 and the porous cleaning pipe 2, wherein FIG. 2A is a side view and FIG. 2B is a plan view. 3 is an enlarged view of a part of the porous cleaning tube, (a) is a side view and (b) is a radial cross-sectional view.

  The water collecting pipe 1 is formed by connecting a required number of known screen pipes. For example, a known screen pipe having a diameter of 60 cm to 1 m can be used. In this embodiment, a screen tube is used, but the water collecting tube is not limited to this, and other tubes such as a porous steel tube, a porous plastic tube, and a reinforced concrete porous tube can also be used.

  In the present embodiment, as shown in FIG. 2, a set of three perforated cleaning tubes 2 is installed horizontally on the gravel layer on the upper side of the water collecting tube 1 for each screen tube 1. 2 is connected to two tubular chambers 3 arranged at right angles to the cleaning tube 2 at both open ends, and communicates with these two chambers 3. One of the two chambers 3 is connected to an air compressor 4 constituting the compressed air supply means of the present invention via a pipe (not shown). The other end of the chamber 3 whose one end is connected to the air compressor is closed, and the other chamber 3 is closed at both ends. As an example of the cleaning tube 2, one having a diameter of 25 mm to 40 mm can be used.

  As the chamber 3, for example, a chamber having a diameter of about 100 mm can be used. In the present embodiment, as shown in FIG. 3, the air ejection holes 5 of the cleaning pipe 2 are formed at two locations on the left and right sides of the cleaning pipe 2, and the diameter of the air ejection holes 5 may be 2 mm, for example. it can.

  The pitch of the air ejection holes 5 in the longitudinal direction of the cleaning tube can be set to 100 mm as an example. The width in the direction orthogonal to the longitudinal direction of the three cleaning pipes 2 is set so as to correspond to the path of the permeated water that contributes to the water intake of the water collecting pipe 1. The size of a set of three cleaning pipes 2 and the chamber 3 is such that compressed air is supplied to every corner of the three cleaning pipes 2 to maintain a predetermined pressure as a whole. It is set so that a uniform air ejection amount can be obtained from the ejection holes 5.

  In this embodiment, one set of three porous cleaning tubes 2 is installed for one screen tube, but the number of porous cleaning tubes is not limited to this, and may be two or four or more. Further, the diameter, pitch, and position of the air ejection holes 5 of the perforated cleaning tube 2 are not limited to the above example, and the compressed air can maintain a predetermined pressure as a whole, and a uniform air ejection amount from the air ejection holes 5. As long as it can be ejected toward the infiltration path of underground water.

Next, the operation of the clogging removing apparatus having the above configuration will be described.
The clogging device is stopped while the underground water is taken from the river and the specified water intake is obtained, but mud and fine sand contained in the underground water are collected and buried as the water intake continues. It accumulates in the gap between the gravel layers of the gravel layer 10 and the river bed surface, and clogging occurs in the infiltration path of the underground water, and the amount of water intake gradually decreases accordingly. When the amount of water intake reaches a predetermined limit amount, the air compressor 4 of the clogging removing device is operated, compressed air is supplied to each porous cleaning tube 2, and air is ejected from each air ejection hole 5 of the porous cleaning tube 2. Let

  As a result, the gravel layer around the catchment burial 1 and the sediment deposited on the upper catchment burial buried portion 10 and the riverbed surface are washed away, and the infiltration path of the underground water is restored to an unclogged state.

  As a result, when the water intake amount is restored to a predetermined amount, the air compressor is stopped, and the supply of compressed air to the perforated cleaning tube 2 is stopped, thereby completing the clogging removal operation of the clogging removing device.

  It is desirable to clean the water collecting burial by the clogging removal device once every 1 to 4 months, depending on the water intake and river conditions, although there are differences depending on the seasonal fluctuations in water volume and turbidity.

According to the experiment, when the underground water intake by the river was carried out using the water collecting pipe and the clogging removing device of the above embodiment, there was usually an intake amount of 500 m ³ / hour, but the sediment contained in the underground water was Since the amount of water intake decreased due to the accumulation and decreased to about 400 m ³ / hour, cleaning was performed by operating the clogging removal device. In this washing step, the clogging removing apparatus was operated for 15 minutes each time, and this operation was performed 3 times a day for 2 days. Therefore, the cleaning by the clogging removing device is performed for a total of 90 minutes. As a result, the water intake amount which was 400 m ³ / hour before washing was recovered to 500 m ³ / hour.

DESCRIPTION OF SYMBOLS 1 Water collecting pipe 2 Porous washing pipe 3 Chamber 4 Air compressor 5 Air ejection hole 10 Water collection buried part

Claims (1)

  Provided with a plurality of perforated cleaning tubes in the gravel layer on the upper side of the water catchment buried with compressed air supplied from the compressed air supply means and formed with a plurality of air ejection holes for ejecting the supplied compressed air A clogging removal device for water collecting burial.

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