JP2008025128A - Riser pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a riser pipe which can efficiently prevent the diffusion of polluted soil by discharging groundwater in a polluted soil area from the polluted soil area, when the polluted soil exists in the area with a formed groundwater discharge hole. <P>SOLUTION: This riser pipe comprises: a plurality of strainer connecting pipes which comprise a strainer connecting pipe body having joint connection portions formed in upper and lower parts, a plurality of slits formed in the strainer connecting pipe body and enabling the inflow of the groundwater, and a filtering net attached in such a manner as to cover an outer peripheral portion of the strainer connecting pipe body; a plurality of joints for linearly connecting the plurality of strainer connecting pipes together; and a well point which is attached to the leading-end strainer connecting pipe via the joint. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riser pipe used in a groundwater level lowering method when excavation work or the like below a groundwater surface is performed.

Conventionally, this type of groundwater level lowering method is called the well point method, and a groundwater discharge hole is formed by boring in the ground where the groundwater level is to be lowered, and a wellpoint is attached to the tip of the groundwater discharge hole. Insert a riser pipe with multiple connecting pipes connected by a joint, and drive the water that was pumped into the riser pipe into the bottom while draining water from the well point to the outside. Drained outside.

For this reason, all groundwater drainage is drained from the well point near the bottom of the groundwater discharge hole. For this reason, if there is contaminated soil above the bottom of the groundwater discharge hole, the groundwater contaminated by the contaminated soil will be drained through the uncontaminated soil. There was a disadvantage of increasing.
JP-A-8-13464

    In view of the above-mentioned conventional drawbacks, the present invention is contaminated by draining the groundwater of the contaminated soil part from the part when there is contaminated soil in the part where the groundwater discharge hole is formed. It aims at providing the riser pipe which can prevent the spreading | diffusion of soil efficiently.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, the present invention provides a strainer connection pipe main body having joint connections formed in the upper and lower portions, a plurality of slits formed in the strainer connection pipe main body and capable of inflowing groundwater, and the strainer connection pipe. A plurality of strainer connection pipes comprising a filtration net attached so as to cover the outer periphery of the main body, a plurality of joints connecting the plurality of strainer connection pipes in a straight line, and a strainer connection pipe at the tip The riser pipe is composed of well points attached to the joints.

The present invention relates to a riser pipe main body in which a plurality of connection pipes are connected in a straight line by a joint, a well point connected to the tip of the riser pipe main body by a joint, and a joint at a predetermined portion of the riser pipe main body. A strainer connection pipe body in which a joint connection portion is formed on the upper and lower parts connected in the above, a plurality of slits formed in the strainer connection pipe body that allow inflow of groundwater, and to cover the outer periphery of the strainer connection pipe body The riser pipe is composed of a strainer connection pipe consisting of a filtration net attached to the pipe.

  As is clear from the above description, the present invention has the following effects.

(1) A strainer connection pipe main body having joint joints formed on the upper and lower parts, a plurality of slits formed in the strainer connection pipe main body that allow inflow of groundwater, and an outer periphery of the strainer connection pipe main body. A plurality of strainer connection pipes composed of attached filtration nets, a plurality of joints connecting the plurality of strainer connection pipes in a straight line, and a strainer connection pipe at the tip end portion are attached via the joints. Since it is composed of well points, the groundwater flowing from the well points and the strainer connection pipe can be drained.
Therefore, even if there is a contaminated soil part, the ground water of the contaminated soil part can be drained from the part through the strainer connection pipe of the part. For this reason, since the contaminated groundwater does not pass through the uncontaminated soil part, it is possible to prevent the contaminated soil from diffusing.

(2) According to the above (1), it is only necessary to use a strainer connection pipe.

(3) According to the above (1), when air flows in from the strainer connection pipe, the drainage pipe can be inserted into the inside to drain the groundwater that has flowed in, so drainage is easy and reliable. it can.

(4) In the second aspect, the same effects as in the above (1) to (3) can be obtained by setting the strainer connection pipe to be located in the contaminated soil part.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the present invention shown in the drawings.

  In the best mode for carrying out the present invention shown in FIGS. 1 to 10, reference numeral 1 denotes a riser pipe according to the present invention, and this riser pipe 1 is composed of a plurality of strainer connection pipes 2 by a plurality of joints 3. The connected riser pipe body 4 and a well point 5 connected to the tip of the riser pipe body 4 by a joint 3 are configured.

  The strainer connection pipe 2 includes a strainer connection pipe main body 7 having joint connection portions 6 and 6 formed at the upper and lower ends, a through hole formed in the strainer connection pipe main body 7 through which a large number of groundwater can flow, In the embodiment, the slit 8, a plurality of filter net support bars 9 fixed in the axial direction at predetermined intervals on the outer periphery of the strainer connection pipe body 7, and the plurality of filter net support bars 9 are covered. It is comprised with the cylindrical filtration net | network 10 fixed to.

  The well point 5 is formed with a joint connecting portion 6 at the rear end, and gradually becomes smaller in diameter, and a well point main body 12 having a plurality of driving water discharge holes 11 formed therein and driving water formed in the well point main body 12. A plurality of through holes 13 capable of discharging and inflowing groundwater, a plurality of filtration net support bars 14 fixed to the outer peripheral portion of the well point body 12 at predetermined intervals in the axial direction, and the plurality of It is comprised with the cylindrical filtration net | network 15 fixed so that the filtration net | network support bar 14 might be covered.

As shown in FIG. 8, the riser pipe 1 configured as described above is inserted into a groundwater discharge hole 17 formed by boring in the ground 16 where the groundwater level is lowered to perform excavation work or the like, and is connected to a turbine pump 18 with a swing joint 21, header. The pipe 23, the T-shaped pipe 26, the valve 27, and the pressure hose 28 are connected, and the water supply pipe 19 connected to the swing joint 21 is inserted near the well point 5 of the riser pipe 1 so that water can be supplied. Then, by supplying the driving water to the well point 5 by the turbine pump 18, the water is discharged from the plurality of driving water discharge holes 11 and the plurality of through holes 13 of the well point 5 to the ground water discharge hole 17. Move the earth and sand of the site and drive so that the well point 5 is located at the bottom of the groundwater discharge hole 17.
Thereafter, the drain pipe 20 is inserted into the riser pipe 1, and the drain pipe 20 is connected to the plant pump 22 via the swing joint 21, the header pipe 23, the T-shaped pipe 26, and the valve 29. Thus, the groundwater that has flowed into the riser pipe 1 through the header pipe 23 and the swing joint 21 is pumped up and drained.

At this time, if there is contaminated soil 24 at the site where the groundwater discharge hole 17 is formed, the end of the drain pipe 20 is positioned at the site and drained as shown in FIG. It is possible to drain the groundwater of the soil area without passing through uncontaminated soil.
Further, in a normal state where there is no contaminated soil, the end of the drain pipe 20 is positioned near the well point 5 and drained.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 11 to 16 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIGS. 11 to 13 is mainly different from the first embodiment for carrying out the present invention in that a plurality of slits are not formed. The riser pipe body 4A in which the connection pipe 25 is connected by the joint 3 and the strainer connection pipe 2 is connected to the predetermined position of the riser pipe body 4A by the joints 3 and 3 so that the riser pipe 1A thus configured is also used. The same effects as those of the best mode for carrying out the present invention can be obtained.

  The third embodiment for carrying out the present invention shown in FIGS. 14 to 16 is mainly different from the second embodiment for carrying out the present invention in that a strainer connection is made at a different predetermined position of the riser pipe body 4A. Even in the case of the riser pipe 1B configured in this way in that the pipes 2 and 2 are connected by the joints 3 and 3, the same effects as the second embodiment for carrying out the present invention can be obtained.

  INDUSTRIAL APPLICABILITY The present invention is utilized in the riser pipe manufacturing industry used when excavation work or the like is performed with the groundwater level lowered.

1 is a front view of the best first embodiment for carrying out the present invention. Sectional drawing which follows the 2-2 line of FIG. The front view of the strainer connection pipe of the best 1st form for implementing this invention. The top view of the strainer connection pipe of the best 1st form for implementing this invention. Sectional drawing which follows the 5-5 line of FIG. The front view of the well point of the 1st best form for implementing this invention. Sectional drawing in alignment with line 7-7 in FIG. Explanatory drawing at the time of driving of the best 1st form for implementing this invention. Explanatory drawing at the time of draining of the contaminated soil site | part of the best 1st form for implementing this invention. The explanatory view at the time of the usual drainage of the best 1st form for carrying out the present invention. The front view of the 2nd form for carrying out the present invention. Sectional drawing which follows the 12-12 line of FIG. Explanatory drawing at the time of drainage of the 2nd form for carrying out the present invention. The front view of the 3rd form for carrying out the present invention. FIG. 15 is a sectional view taken along line 15-15 in FIG. 14; Explanatory drawing at the time of the drainage of the 3rd form for carrying out the present invention.

Explanation of symbols

1, 1A, 1B: riser pipe,
2: Strainer connection pipe, 3: Joint,
4, 4A: riser pipe body, 5: well point,
6: Joint connection part, 7: Strainer connection pipe body,
8: Slit, 9: Filter net support bar,
10: filtration network, 11: discharge hole,
12: Well point body, 13: Through hole,
14: Filter net support bar 15: Filter net
16: Ground, 17: Groundwater discharge hole,
18: Turbine pump, 19: Water supply pipe,
20: Drain pipe, 21: Swing joint,
22: Plant pump, 23: Header pipe,
24: contaminated soil, 25: connecting pipe,
26: T-shaped pipe, 27: Valve,
28: Pressure hose, 29: Valve.

Claims (2)

Strainer connection pipe main body with joint connection parts formed on the upper and lower parts, a plurality of slits formed in the strainer connection pipe main body allowing inflow of groundwater, and attached to cover the outer periphery of the strainer connection pipe main body A plurality of strainer connection pipes comprising a filtration network, a plurality of joints connecting the plurality of strainer connection pipes in a straight line, and a well point attached to the strainer connection pipe at the tip via a joint; A riser pipe characterized by comprising A riser pipe body in which a plurality of connection pipes are connected in a straight line with a joint, a well point connected to the tip of the riser pipe body with a joint, and a joint that is connected to a predetermined portion of the riser pipe body. Strainer connection pipe body with joint connection parts formed on the upper and lower parts, a plurality of slits formed in the strainer connection pipe body that allow inflow of groundwater, and attached to cover the outer periphery of the strainer connection pipe body. A riser pipe characterized by comprising a strainer connection pipe comprising a filter net.

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