JP4194617B2 - Groundwater collection multi-pipe - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a groundwater drain or groundwater water collecting apparatus using a multiple pipe for civil engineering.

  The groundwater drainage device is an important device for landslide prevention work, and it is subjected to diameter-expanded boring in an upward gradient from the surface to the landslide zone,

  The water-impermeable expanded casing remains, and after inserting a water-permeable outer tube, a water-impermeable inner tube, and a multiple tube with a funnel-shaped connecting tube, the water-impermeable expanded casing is pulled out of the ground. Thus, the above-mentioned multiple pipes remain in the ground (for example, Patent Document 1).

  However, it is difficult for the groundwater to flow over the expanded diameter stage between the upper end of the funnel-shaped connecting pipe and the permeable outer pipe, and it is difficult to form a water blocking weir. It is difficult to collect the water sufficiently, and there is a possibility that the water will flow over the outer periphery of the funnel-shaped connecting pipe, clog the inside and outside of the permeable outer pipe, and clog the multiple pipe with mud or earth and sand.

  Therefore, an attempt has been made to provide a sliding prevention ring at the enlarged diameter end of the funnel-shaped connecting pipe, block the flow of earth and sand and water, and allow only water to flow into the permeable outer pipe (for example, Patent Document 2).

  However, after pulling out the water-impermeable expanded casing outside the hole, the hole wall is exposed and not only clogs the space between the hole wall and the water-permeable outer pipe with earth and sand, but also The drawing work out of the hole was required (for example, Patent Document 2).

  After the impermeable casing is pulled out of the hole, the permeable porous casing is fitted into the enlarged bore hole, and the enlarged hole wall is sealed to form a permeable enlarged hole. The above-mentioned multiple pipes are fitted in the diameter holes, and a packer with a water-expandable annular rubber seal is provided on the outer periphery of the funnel-shaped water collecting joint to form a water-stop weir. A device has been devised that guides and flows into the impervious inner pipe (for example, Patent Document 3).

However, the inner diameter of the impervious inner pipe is small and double flowing water gaps T and t are required, and since the respective radial gaps are large, the water collection efficiency is low, and the permeable porous casing cannot be expanded. After the water-permeable casing was pulled out of the hole, a process of reinserting the water-permeable porous casing was required, and an operation period and a useless porous casing were required (for example, Patent Document 3).
JP 61-179912 A JP-A-6-88335 Japanese Patent No. 2777346

  The present invention excavates a large-diameter boring hole in the landslide mass from the surface part and the drainage well at an elevation angle, omits the drawing work of the large-diameter impermeable casing and the insertion work of the large-diameter water-permeable casing, and shortly after the large-diameter boring. A weir for fitting water into the permeable porous outer tube by means of a water-absorbing expansion rubber (packer) provided at the joint of a large number of permeable porous outer tubes on the common center line, with the groundwater collection multiple pipe fitted in the borehole The purpose is to improve the efficiency of groundwater drainage.

In order to achieve the above object, the present invention firstly forms a female screw on the downstream side of each of the plurality of water permeable porous outer tubes , engages it with a male screw formed on the upstream side of the connecting inner tube , The upstream inner surface or inner periphery of the permeable porous outer tube is fitted or screwed to the downstream outer surface or outer periphery of the connecting inner tube, and connected to the common center line by an upward gradient , Has two annular ridges, the outer diameter of the ridge is equal to the outer diameter of the porous outer tube, and a pad of water-expandable rubber is fitted between the ridges and fixed with a thin ring. the other end of the imperforate inner tube which is fitted one end to the connection in the pipe via the gap to the inlet of the downstream side connection inner tube is open, between the perforated outer pipe and imperforate inner tube Ri Na with intervening water collecting gap, and the connection in the pipe middle inner peripheral surface to the non-porous inner pipe ground water catchment multitube ing to form an upstream end supporting step of,
Consists of.

  Therefore, the diameter-expanded boring is constructed from the ground cut surface reinforced with concrete or the like to the stable ground with an upward slope.

  Then, after pulling out the boring rod and the enlarged casing from the enlarged bore hole, insert a permeable porous outer tube with a tip cone having a slightly smaller outer diameter than the outer diameter of the bore hole,

  Fit the outer periphery of the connection inner tube at the upstream end of the multiple tube that is a set of the connection inner tube, the water permeable outer tube and the non-porous inner tube to the downstream inner periphery of the permeable porous outer tube with tip cone It is made to fit in the said diameter expansion boring, combining and connecting on a common centerline.

  In this way, the outer circumferences of the multiple porous outer tubes can be connected to the common center line to the enlarged bore wall.

  In the connection fitting operation, the upstream outer periphery of the connection inner tube is screwed into the downstream inner periphery of the water permeable porous outer tube, and the downstream open end of the non-porous inner tube is connected to the inlet of the downstream connection inner tube via an inflow interval. Open.

  When formed in this way, a water collection gap leading to the inflow interval can be interposed between the water-permeable porous outer tube and the water-impermeable non-porous inner tube.

  Since the present invention is configured as described above, after the construction of the enlarged bore hole, the directly permeable porous inner and outer pipes and the connecting inner pipe can be inserted into the enlarged bore hole on the common center line. There is an effect that groundwater can be introduced into the downstream impermeable inner pipe through the upstream permeable outer pipe by the ground water weir with the water expansion rubber in the connecting portion, and the water collection of the groundwater can be improved.

  Female threads 1 '' are formed on the downstream side of each of the plurality of water permeable porous outer tubes 1, 1 having a plurality of slits 1 'parallel to the common center line c,

  This is screwed with a male screw 2 ″ (round screw) formed on the upstream side of the connection inner pipe 2, and the upstream inner surface of the permeable porous outer pipe 1 is fitted to the downstream outer surface of the connection inner pipe 2. A plurality of water permeable porous outer tubes 1 and 1 having the same outer diameter are sequentially fitted into an enlarged bore hole 10 drilled toward the landslide lump 9 in an upward gradient from the ground surface and the drainage well.

  It is also possible to connect the outer periphery on the downstream side of the connecting inner tube 2 and the inner periphery on the upstream side of the permeable porous outer tube 1 by screwing with male and female screws.

Two annular ridges 5 and 5 are provided in the middle of the connecting inner pipe 2 , and the outer diameters thereof are formed to be equal to the outer diameters of the permeable porous outer pipes 1 and 1 on the upstream and downstream sides, The water expansion rubber 3 (with a pad) is fitted between the protrusions 5 and 5, and is stopped by the thin ring 3 ′.

  The outer periphery of the impermeable non-porous inner tube 4 is fitted and supported on the downstream inner periphery of the connecting inner tube 2, and the downstream (other end) opening of the inner tube 4 is connected downstream. An opening 4 ′ is formed at the upstream side inlet 2 ′ of the connecting inner pipe 2 through the interval T,

  A water collection gap t between the water-permeable porous outer tube 1 and the water-impermeable non-porous inner tube 4 on the upstream side is communicated with the space T.

  The water collection gap t is formed by the thickness on the downstream side of the connection inner pipe 2.

  In the multi-tube 11 formed as described above, a plurality of water-permeable porous outer tubes 1 and 1 are inserted along the hole wall of the diameter-expanded borehole 10 immediately after drilling, and the hole wall is the porous outer tube 1 or 1. 1 is directly supported.

  Further, the water-expandable rubber 3 exposed in the middle of the connection inner tube 2 of the porous outer tube 1, 1 absorbs water and expands, and is pressure-bonded to the hole wall so as to be permeable on the upstream and downstream sides. In the middle, the groundwater is dammed and diverted, and is led to the space of the above-mentioned interval T upstream.

  And a water collecting channel is formed from the interval T to the connecting inner tube 2 and through the impermeable non-porous inner tube 4 to the downstream interval T,

  Groundwater in the landslide block is drained outside the surface 8 and from the drainage well to the outside of the surface through drain holes.

  In the figure, the reference numeral 2a indicates a support stage at the upstream end of the impervious non-porous inner tube 4 formed on the inner peripheral surface of the connecting inner tube 2, and reference numeral 11 'in FIG. A lower end portion of the outer tube 11, 12 is an inclined opening surface, and 13 is a check valve loosely supported on the upper end portion of the opening surface 12.

Naozu 3 in 14 collecting the water in the porous outer tube 1, 14 'multi Anagaikan 1 outside the collecting surface of the water, 15 is a tip cone.

  In the present invention, the permeable landslide mass is inserted into the landslide mass in an upward gradient from the ground surface and the drainage well, and after the casing is pulled out to the ground surface, the permeable porous outer pipes 1 and 1 are quickly inserted into the landslide mass. A large amount of groundwater can be drained through the relatively large-diameter impermeable non-porous inner tube 4 and the interval T for collecting water from each porous outer tube 1.

It is a construction state longitudinal cross-sectional view of the groundwater collection multiple pipe | tube of this invention. It is a partially expanded longitudinal cross-sectional view of FIG. FIG. 2 is a left side view showing a packer swelling state in the ground, taken along line 1A-A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Porous outer pipe 2 Connection inner pipe 2 'Inlet c Common center line 3 Water expansion rubber 4 Non-porous inner pipe 4' Opening T space | interval t Water collection gap 5 Annular protrusion

Claims (1)

A female thread is formed on the downstream side of each of the plurality of water permeable porous outer tubes , and this is threadedly engaged with a male screw formed on the upstream side of the connecting inner tube. Fitting or screwing the upstream inner surface or inner circumference of the outer tube and connecting it on the common center line by an upward gradient ,
Two annular ridges are provided on the outer periphery of the middle of the connecting inner pipe ,
The outer diameter of the ridge is equal to the outer diameter of the porous outer tube,
Put a pad of water expansion rubber between the above ridges , and stop with a thin ring,
Open the other end of the non-porous inner pipe fitted with one end to the connecting inner pipe to the inlet of the downstream connecting inner pipe via a gap,
Ri Na and water collecting gap is interposed between the perforated outer pipe and imperforate inner tube, and it forms the upstream end support stage of the imperforate inner tube in the middle in the circumferential surface of the connection in the pipe Multiple underground water collection pipes.

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