JP2011084905A - Clogging prevention device of water collection pipe in underground water drainage mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clogging prevention device of a water collection pipe in an underground water drainage mechanism capable of preventing the water collection pipe from being clogged in the underground water drainage mechanism for draining underground water. <P>SOLUTION: This clogging prevention device includes the water collection pipe (2) having many opened water collection holes (4), (4), etc. on its peripheral face buried into the ground and a sediment discharge shaft (10) having a screw blade (12) and inserted into the water collection pipe (2) concentrically and rotatably. In this device, the sediment discharge shaft (10) is rotated by water pressure of the water stream flowing in the water collection pipe, and a deposit floating in the water collection pipe and attempting to adhere to its interior wall and be deposited on it is peeled off and removed by the screw blade (12) and is automatically discharged together with the water stream. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water collecting pipe clogging prevention device in a groundwater drainage mechanism, and more particularly to a water collecting pipe clogging prevention device suitable for application to a water collecting pipe for groundwater drainage in a landslide-induced zone.

  In general, landslide activity is closely related to the rise of groundwater level, and during thawing and heavy rain, pore water pressure near the landslide surface increases and landslides often occur.

  Therefore, in order to suppress the occurrence of landslides, it is said that it is necessary to positively remove the groundwater near the sliding surface and keep the pore water pressure at a low value at all times.

  Therefore, as shown in FIG. 6, conventionally, a large number of water collecting pipes (2) are embedded in parallel in the ground (1) where landslide may occur, through the retaining wall (3). A groundwater drainage mechanism that collects groundwater in the water collecting pipe (2) and discharges it through the inside is used.

  The water collecting pipe (2) used for the drainage mechanism generally has a large number of water collecting holes (4), (4). . . Are formed, and these water collecting holes (4), (4). . . The groundwater is collected in the water collecting pipe (2) through and drained from the discharge end (2a) at the pipe end to the drainage groove (5) on the ground surface. By the way, the water collecting pipe (2) has a diameter of 40 to 50 mm and a length of about 50 m which are sequentially connected to each other, and is embedded in a plurality of places.

  The groundwater drainage mechanism that has been used in the past, after the drainage pipe (2) is buried in the ground, is discharged from the outlet (2a) at the end of the pipe. As a result, the outer periphery of the water collecting pipe (2) dries, and as shown in FIG. 8, earth and sand or reddish brown sludge scale (6) becomes the water collecting holes (4), (4). . . From the water and adheres to the inside of the pipe, or the root of the plant (7) enters or moss grows and accumulates on the bottom of the pipe, and the water collecting holes (4), (4). . . Will be blocked and lose its ability to collect water.

  In addition, when iron-rich groundwater flows into the water collecting pipe (2) and stays for a long time, iron bacteria are cultured to form a sludge-like scale, and this formed material together with water forms the end of the water collecting pipe (2). When it flows out from the discharge port (2a) at a natural flow rate, it settles on and adheres to the bottom of the water collection tube near the discharge port (2a), and oxidizes with the passage of time so that the water collection tube (2) becomes blocked. This leads to a problem that leads to a loss of the drainage function (see FIG. 7).

  If the outlet (2a) at the end of the water collecting pipe (2) is blocked as shown in FIG. 7, it will not be possible to flow out of the outlet (2a), and as a result, groundwater will flow behind the retaining wall (3). It will stop and the groundwater (8) will gradually flow back towards the back, which will result in a landslide.

Japanese Patent No. 1266476

  The present invention automatically removes and deposits deposits deposited on the inner surface of a water collecting pipe that is buried in the ground and collects and discharges groundwater, using the water pressure of the collected groundwater to discharge it. The object was to prevent clogging of the water pipes.

  As means for solving the above problems, the present invention provides a groundwater drainage mechanism that collects and discharges groundwater, and has a water collection pipe embedded in the ground and opened with a large number of water collection holes, and a screw blade. And a sediment discharge shaft that is concentrically rotatably inserted into the water collection pipe, and the sediment discharge shaft is rotated by the water pressure of the water flowing through the water collection pipe, so that the screw blades float in the water collection pipe. Then, the deposits which are to be deposited and deposited on the inner wall are peeled and removed, and are automatically discharged on a water stream.

  The groundwater drainage mechanism is suitable for installation in a zone where landslides are a concern.

  The earth and sand discharge shaft has screw blades each having a plurality of blades protruding in the radial direction, and a plurality of screw blades arranged in the axial direction at a predetermined interval. It is possible to select a configuration in which the screw blades are disposed intermittently as a shape, and further, a configuration in which the screw blades are continuously disposed.

  According to the present invention, the sediment discharged by self-rotation by the pressure of the water flow that flows into the pipe and reaches the discharge port at the end of the pipe while depositing and depositing on the inner surface of the water collecting pipe buried in the ground and collecting groundwater. Since it is peeled and removed by the screw blades of the shaft, it is put on the water stream and discharged to the ground surface, so that clogging is reliably prevented by a self-contained function under a simple configuration without applying any driving force (energy) from the outside. And maintenance is unnecessary.

  If the screw blades of the earth and sand discharge shaft are made to be intermittent or continuous, the rotation of these helical blades will add to the function of removing the deposits in the pipe and add the screw conveyor function to further enhance the earth and sand discharge effect. it can.

Sectional drawing which represented one part in perspective which shows one Embodiment of the clogging prevention apparatus of the water collection pipe | tube in the groundwater drainage mechanism by this invention. AA arrow sectional drawing of FIG. FIG. 2 is a partial cross-sectional view illustrating an embodiment in which the screw blade in FIG. 1 is a spiral blade. Sectional drawing of a part which shows another modification as same as the above. Explanatory drawing which shows an example of the groundwater drainage mechanism using the clogging prevention apparatus of the water collection pipe | tube by this invention. Explanatory drawing which shows the prior art. Explanatory drawing which shows the malfunction of a prior art similarly. The partial sectional view showing the situation where earth and sand adhered and deposited in the conventional water collecting pipe.

  FIG. 1 shows an embodiment of a water collecting pipe clogging prevention device according to the present invention, and is a sectional view partially showing a perspective view. A water collecting pipe (2) itself has a large number of peripheral surfaces as in the conventional case. Water collecting holes (4), (4). . . Is made of a pipe material having an inner diameter of about 40 to 50 mm.

  In the present invention, the earth and sand discharge shaft (10) is rotatably inserted into the water collecting pipe (2) concentrically therewith.

  The earth and sand discharge shaft (10) has screw blades (12), (12). . . Is attached.

  The screw blade (12) in the embodiment shown in FIG. 1 has three blades (12a), (12a) in a state of being twisted in a propeller shape as shown in FIG. (12a) is projected at equal intervals in the radial direction, and its tip has a length as close as possible to the inner peripheral surface of the water collecting pipe (2).

  The shaft (11) of the earth and sand discharge shaft (10) is inserted through a bearing member (13), and this bearing member (13) has three legs (13a), (13a), (13a) at equal intervals. The tips of the legs (13a), (13a), and (13a) come into contact with the inner peripheral surface of the water collecting pipe (2) to support the shaft (11) in a stable state.

  When the bearing member (13) is configured to be press-fitted along the inner surface of the water collecting pipe (2), the shaft (11) can be freely rotated with respect to the bearing member (13). ) Legs (13a), (13a). . . Can be rotated together with the shaft (11) when it is not brought into pressure contact with the inner surface of the water collecting pipe (2), any configuration is arbitrary.

  3 and 4 show an embodiment in which the configuration of the screw blade (12) is in the form of a spiral blade, and FIG. 3 shows an embodiment in which the spiral blade (12b) is provided intermittently on the shaft (11). FIG. 4 shows a spiral blade (12b) continuously provided on the shaft (11). In any case, the function of conveying the earth and sand from which the spiral blades (12b) and (12b) have been peeled off is enhanced, and the effect of discharging earth and sand is further enhanced.

  FIG. 5 shows an example of a groundwater drainage mechanism using the present invention, in which a water collecting pipe (2) is embedded through a retaining wall (3) and inclined to the ground (1) over a required length. The tube end protrudes outside the retaining wall (3), and an inverted U-shaped seal tube (14) (trap) is connected to the tube end, before the seal portion (14a) of the seal tube (14). A tank (15) for collecting discharged earth and sand is connected to the tank, and a sediment discharge valve (16) for discharging the collected earth and sand in a timely manner is provided at the lower part of the tank (15).

  Next, the operation will be described.

  In the embodiment shown in FIG. 1 and FIG. 2, if the water collecting pipe (2) is embedded in the ground in the landslide area with a gradient, the groundwater in the ground will be collected in the water collecting hole (4) of the water collecting pipe (2). ), (4). . . Flows into the pipe and flows as a water stream toward the outlet (2a) at the pipe end.

  When the amount of water collected increases, the screw blades (12), (12). . . And the earth and sand to be deposited and deposited on the inner wall of the water collecting pipe (2) by the rotation of the screw blades (12), (12). . . The earth and sand scraped off by the tip of the pipe flows toward the outlet (2a) at the end of the pipe by the thrust generated by the screw blade (12) and the water flow flowing in the water collecting pipe (2), and the outlet (2a ) To the outside along with groundwater.

  If the configuration of the screw blade by the spiral blade (12b) as shown in FIG. 3 and FIG. 4 is used, the spiral blade (12b) rotates by receiving water pressure as described above and adheres to the inner wall of the water collecting pipe (2). The earth and sand to be scraped are scraped off, and the scraped earth and sand are sent in the downstream direction by the function of the screw conveyor by the spiral blade (12b) and discharged from the discharge port (2a).

  According to the embodiment shown in FIG. 4, the screw blade (12) having a spiral shape is rotated by water pressure in the same manner as in the above-described embodiment to peel off sedimentary sediments and at the same time, the screw blade (12) functions as a screw conveyor. And is discharged downstream from the discharge port (2a).

  If embodiment of FIG. 5 is employ | adopted, discharged earth and sand will not spill out of a natural ground, but it can collect | recover in a tank (15), can be removed collectively, and does not pollute the environment.

2 water collecting pipe 2a discharge port 3 retaining wall 4 water collecting hole 5 discharge groove 10 earth and sand discharge shaft 11 shaft 12 screw blade 12a blade 12b spiral blade 13 bearing member 14 seal tube

Claims (6)

  In the groundwater drainage mechanism that collects and discharges groundwater, it has a water collection pipe that is buried in the ground and has a number of water collection holes in the circumference, and screw blades, and rotates concentrically within the water collection pipe The earth and sand discharge shaft is freely inserted, and the earth and sand discharge shaft is rotated by the water pressure of the water flow flowing in the water collection pipe, so that the screw blades float in the water collection pipe and try to adhere to the inner wall. An apparatus for preventing clogging of a water collecting pipe in a groundwater drainage mechanism, wherein the kimono is peeled and removed, and is automatically discharged on a water flow.   The apparatus for preventing clogging of a water collecting pipe in a groundwater drainage mechanism according to claim 1, wherein the collecting pipe is embedded in a natural ground that may induce a landslide.   2. The earth and sand discharge shaft has screw blades each having a plurality of blades protruding in a radial direction as a set, and a plurality of sets of the blades are arranged at predetermined intervals in the axial direction. The clogging prevention apparatus of the water collection pipe in the groundwater drainage mechanism of 2 description.   The clogging prevention device for a water collecting pipe in a groundwater drainage mechanism according to claim 1 or 2, wherein the earth and sand discharge shaft is intermittently provided with spiral screw blades.   3. The clogging prevention device for a water collecting pipe in a groundwater drainage mechanism according to claim 1, wherein the earth and sand discharge shaft is continuously provided with screw blades having a spiral shape.   6. An inverted U-shaped seal pipe is connected to a pipe end of the water collecting pipe projecting out of a natural ground, and a discharged earth and sand collection tank is connected to a position before the seal portion of the seal pipe. An apparatus for preventing clogging of a water collecting pipe in the groundwater drainage mechanism according to any one of the preceding claims.

Images