JP2007162273A - Intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase an intake capacity by preventing the clogging of an intake cylinder. <P>SOLUTION: A skeleton cylinder 9 is formed of upper flange rings 5 having center holes 4, a lower flange ring 7 having a center hole 6, and connecting rods 8, 11 annularly arranged between positions close to the outer peripheries of the flange rings 5, 7 and between positions close to the inner peripheries of the flange rings 5, 7 and stuck to the respective flange rings 5, 7. Net bodies 11, 12 are stretched over the outer periphery and inner periphery of an imaginary cylinder constituted of a group of connecting rods 8, 11 of the skeleton cylinder 9 to form the intake cylinder 1. The intake cylinder is located in an aquifer in the ground and connected to a casing 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a deep well type water intake device.

  Conventionally, a well device has been used as a water intake device for taking underground water or underground water.

  One of the above water intake devices is a deep well type. As shown in the cross-sectional view of the outline in FIG. 7, the conventional water intake device by this deep well method excavates the excavation hole a from the ground surface (GL) with an auger or the like, and the inner peripheral wall surface of the excavation hole a. In order to prevent collapse, a reinforcing material b such as bentonite is applied and reinforced, and after excavating to a predetermined depth, a casing d having a large number of water passage holes c in the peripheral surface and aquifer formation other than the aquifer Casing e which does not have a water collection hole is sequentially connected and built in a position corresponding to the part.

  Next, a backfill material f such as gravel is filled between the casing d and the inner peripheral wall surface of the excavation hole a, and the upper part of the aquifer is filled with clay g to prevent water from entering. It is supposed to be a structure.

  In the water intake apparatus configured as described above, the reinforcing material b such as bentonite or clay applied to the inner peripheral wall surface of the excavation hole a is washed and removed prior to pumping so as not to prevent the inflow of groundwater. It is necessary, but the present condition of sufficient removal is not given.

  That is, the reason is that in order to remove the reinforcing material b on the inner peripheral wall surface of the excavation hole a, pressure water or high-pressure air is injected from the casing d through the water passage hole c, and the reinforcing material b is peeled off by the pressure. When it is going to be removed, when the pressure reaches the reinforcing material b through the gap between the backfilling materials f, f... Packed between the casing d and the reinforcing material b, the pressure is remarkably reduced. This is because the reinforcing material b adhered and impregnated up to the back of the aquifer cannot be completely eliminated.

  Further, since the water passage hole c of the casing d is easily blocked by the backfill material f such as irregular gravel, the opening ratio of the water passage hole c is substantially reduced, and washing water or high-pressure air is injected from the inside of the casing d. Inability to perform large-scale spraying during cleaning also causes incomplete cleaning.

  Accordingly, when pumping is subsequently started through the casing d, the clay, mud and the like remaining in the deep part of the inner peripheral wall surface of the excavation hole a are gradually melted and the backfilling material f in a position close to the inner peripheral wall surface f , F... Enters the gap between them and solidifies, causing clogging and greatly reducing the water collecting ability, or causing a situation where water cannot be collected.

  In the above, the biggest cause of the decline in the water collecting capacity and the inability to collect water is a small hole group for allowing groundwater to flow into the casing d, and the water passage hole c composed of the slit group has earth pressure or water pressure. Since the opening ratio is determined within the strength range that can withstand the water, the part other than the water passage c exists as a wall surface (strength maintaining part), so that not only the water collecting ability is limited, but also clogging. It is a factor that tends to cause.

  For the purpose of paying attention to the above points and improving them, the present applicant has previously provided a water collecting apparatus disclosed in Patent Document 1.

  In the water collecting device shown in Patent Document 1, a water-permeable housing is externally fitted to the outer peripheral surface of the casing d so as to have a predetermined interval, whereby the water-permeable housing is formed between the water-permeable hole and the housing of the casing d. A space is formed, and the backfilling material is filled between the outer periphery of the housing and the inner peripheral wall surface of the excavation hole so that the backfilling material does not contact the water passage hole of the casing.

  As a result, the water flow holes of the casing are not blocked by the backfilling material, and the water collecting ability can be maintained.

However, even with the above water intake device, water collection is performed only through the water passage hole of the casing, so that there are still wall surfaces h other than the water passage holes c of various forms illustrated in FIG. Since there was a limit, there was still a problem that water collection capacity was unavoidably limited.
Japanese Patent Laid-Open No. 2005-120738

  In view of this, the present invention drastically modifies the structure of the water collecting portion that collects water through the casing, and by removing the reinforcing material and increasing the water collecting capacity without causing clogging, the water collecting amount is greatly improved. It was made as a task.

  As a means for solving the above problems, the present invention is a water intake device that collects and pumps water through a casing built in a drilling hole excavated from the ground surface, and includes an upper flange ring having a central hole and a central hole. A skeleton cylinder is formed by a lower flange ring having a plurality of connecting rods arranged annularly between positions near the outer periphery of the flange rings and fixed to the flange rings, and is constituted by the connecting rod group A net was fitted around the outer circumference of the virtual cylinder to form a water intake cylinder, and this water intake cylinder was connected between casings located in the formation other than the aquifer by means of its flange ring to constitute a water intake device. It is in.

  In addition to the connecting rod, the intake tube is configured by a plurality of inner connecting rods arranged in an annular manner between positions near the inner periphery of the upper and lower flange rings, and fixed to the flange ring. An inner net is stretched around the inner circumference of the virtual cylinder to form a backfilling material filling space between the outer net and the inner net, and this is filled with the backfilling material. be able to.

  In this case, the upper flange ring is made into two pieces with a required space between each other, and at least one of the connecting members for connecting the flange rings is formed of a hollow connecting material and is hollowly connected to the upper surface of the outer flange ring. It is preferable that the upper end of the material is opened, and the backfilling material filling space is filled through the opening.

  Further, when the net body is disposed only outside the water intake cylinder, the water intake device can be configured by filling the backfill material between the net body and the inner peripheral wall surface of the excavation hole.

  On the other hand, the back-filling material is formed in a spherical shape or a polygonal spherical shape with plastic as an alternative to gravel, and has a configuration in which a plurality of grooves are formed in the peripheral surface portion.

  The groove is preferably formed with a phase difference of 90 ° between one half of the sphere and the other half, and a small hole is formed at the bottom of each groove so that the groove in one half and the groove in the other half are formed. It is preferable to adopt a configuration in which

  According to the present invention, a water intake cylinder having a structure in which a skeleton cylinder in which upper and lower flange rings are joined by a plurality of connecting rods and a net body is fitted to the outer periphery of a virtual cylinder formed by the connecting rods of the skeleton cylinders is provided. Therefore, the skeleton tube is strong against external pressure and at the same time has no wall surface part like the conventional screen, so the opening of the net is almost fully utilized, and the inflow area into which groundwater flows is 90%. It becomes possible to make it the structure which obtains the value close | similar to, it becomes a water intake cylinder with good water intake efficiency, water collection capability can be remarkably increased, and clogging can be suppressed to the minimum.

  In addition, since it can be directly coupled and connected to the pipe-like casing by the upper and lower flange rings of the skeleton cylinder, there is no trouble at the time of construction of the water intake device, and the construction can be performed with high efficiency.

  On the other hand, if a plurality of inner connecting rods are annularly arranged at the positions near the inner circumference of the upper and lower flange rings, and an inner net is stretched around the inner circumference of the virtual cylinder formed by these connecting rods, A space for filling the backfill material can be created between the outer mesh body and the inner mesh body, and a filtration function can be added by filling the backfill material into the backfill material. Can not collect groundwater.

  In addition, when removing the reinforcing material applied to the inner peripheral wall surface of the excavation hole, a large amount of cleaning water or pressurized air can be brought into contact with the inner peripheral wall surface, so that the clay permeating deep in the inner peripheral wall surface And mud can be completely eliminated.

  If the backfilling material used in combination with the water intake tube is formed into a spherical shape with plastic and a plurality of grooves are formed on the peripheral surface thereof, a large gap is formed between them because of the spherical shape. In addition, it is difficult to cause clogging in the meantime, and in addition, passages for washing water and pressurized air are secured through the grooves, thereby further preventing clogging.

  FIG. 1 shows an outline of a water intake apparatus according to the present invention, and FIG. 2 shows a cross-sectional view of an embodiment of a water intake cylinder 1 which is a main part constituting the water intake apparatus of the present invention.

  As shown in FIG. 1, the intake pipe 1 is connected to a casing 3 that is built in a drilling hole 2 excavated from the ground surface (GL), and the configuration thereof is shown in FIGS. 2 to 4. As illustrated, a plurality of connecting rods 8, 8, which are annularly arranged between positions near the outer periphery of an upper flange ring 5 having a center hole 4 and a lower flange ring 7 having a center hole 6 are also provided on the flange. A rigid skeleton cylinder 9 is formed by being fixed to the rings 5 and 7, and a net body 10 is fitted to the outer periphery of a virtual cylinder constituted by the connecting rods 8, 8... Yes.

  In the illustrated embodiment, apart from the connecting rod 8, a plurality of inner connecting rods 11, 11... Are annularly arranged at positions close to the center hole of the flange rings 5, 7 and fixed to the flange rings 5, 7. The inner mesh body 12 is stretched around the inner periphery of a virtual cylinder composed of these connecting rods 11, 11... And the backfilling material filling space is formed between the outer mesh body 10 and the inner mesh body 12. 13 is formed and filled with the backfill material 14.

Further, the upper flange ring 5 is composed of _first and _second flange rings 5 ₁ and 2 2 provided at a required interval, and there is little bonding material for connecting the flange rings 5 ₁ and 5 _2. both one are hollow coupling member 15, the upper end of the hollow coupling member 15 is opened to the first upper surface of the flange ring 5 _1, lower end is opened so as to face to the back-filling material filling the space 13 Thus, the backfilling material 14 is introduced into the space 13 from the upper end opening 15a.

  As an example of actual dimensions of the water intake cylinder 1, the axial length is 1000 mm, the outer diameter of the flange rings 5 and 7 is 540 mm, and the inner diameter of the center holes 4 and 6 is about 320 mm. Further, the outer diameter of the connecting rods 8 and 11 is 24 mm, and the number of the connecting rods 8 and 11 is 16 on the outside and 8 on the inside. Furthermore, the mesh bodies 10 and 12 are made of a mesh material knitted into a 12 mm square with a stainless steel material having a thickness of 2 mm.

  These dimensions are appropriately selected according to the scale of the water intake device.

  The backfilling material 14 used for the water intake cylinder 1 is formed in a polygonal or spherical shape with plastic, and a plurality of grooves 17 are formed on the peripheral surface of the spherical body 16.

  In the illustrated embodiment, a plurality of grooves 17, 17 are formed in one half and the other half of the sphere 16 so as to be 90 ° out of phase with each other, and the bottom of the portion where the grooves 17, 17 intersect A small hole 18 is formed in each of the two and the grooves 17 and 17 communicate with each other.

  Therefore, when the backfilling material 14 is filled in the space 13, a large gap is formed between the backfilling materials 14 because the backfilling material 14 has the same size and has a spherical or polygonal spherical shape. In addition, the water from any direction flows through the grooves 17 and 17 and the small holes 18 of the backfilling material 14 so that the groundwater collection is not hindered and the filtration function is sufficiently performed.

  Further, when cleaning the reinforcing material on the inner peripheral wall surface of the excavation hole 2, the cleaning effect can be enhanced without impeding the passage of cleaning water or pressurized air.

  As shown in FIG. 1, the intake cylinder 1 is connected between the casings 3 and 3 so that the intake cylinder 1 is positioned at the ground aquifer 19. The connection is bolted using the connecting bolt holes 20 and 20 of the flange rings 5 and 7.

  While incorporated in this way, groundwater flows from the aquifer 19 into the excavation hole 2, but the groundwater flows into the intake pipe through the outer net 10, the backfill 14, and the inner net 12. The water is stored and pumped up appropriately by a pump.

  In the above, since the intake cylinder 1 has only the connecting rods 8 and 11 of the skeleton cylinder 9 inside, it is equivalent to the fact that no wall surface exists on the peripheral surface, and thus the opening ratio is a high value that is substantially close to 90%. Obtained, and the water collecting ability is remarkably enhanced.

  This not only collects water but also allows the cleaning water and the pressure air to pass well when cleaning and removing the reinforcing material on the inner peripheral wall surface of the excavation hole 2 so that the cleaning can be performed efficiently.

  FIG. 5 shows an example in which the backfilling material 14 is filled between the intake pipe 1 and the inner peripheral wall surface of the excavation hole 2. In this case, the outside of the lower flange ring 7 of the intake pipe 1 is shown. The diameter is increased to receive the backfill material 14, and the inner net 12 of the water intake cylinder 1 is omitted.

The figure which shows the outline | summary of the water intake apparatus by this invention. Sectional drawing which shows one Embodiment of the intake pipe in this invention. The perspective view of the skeleton cylinder which makes the skeleton of the water intake cylinder in FIG. (A) is a top view of a skeleton cylinder, (B) is a front view. Sectional drawing which shows other embodiment of a water intake apparatus. An example of the backfill material in this invention is shown, (A) is a perspective view, (B) is a top view. Sectional drawing which shows the conventional water intake apparatus. Explanatory drawing which shows the kind of water flow hole of the conventional casing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake cylinder 2 Excavation hole 3 Casing 4,6 Center hole 5 (5 ₁ , 5 ₂ ) Upper flange ring 7 Lower flange ring 8 Connection rod 9 Frame cylinder 10 Net body 11 Inner connection rod 12 Inner network body 13 Backfilling material filling Space portion 14 Backfill material 15 Hollow binding material 16 Sphere 17 Groove 18 Small hole 19 Aquifer 20 Bolt hole

Claims (6)

  A water intake device that collects and pumps water through a casing built in a drilling hole excavated from the surface, and includes an upper flange ring having a center hole, a lower flange ring having a center hole, and these flange rings. A skeleton cylinder is formed with a plurality of connecting rods arranged annularly between positions near the outer periphery of the frame and fixed to the flange ring, and a mesh body is provided on the outer periphery of the virtual cylinder constituted by the connecting rod group of the skeleton cylinders. A water intake device that is configured to be fitted into a water intake tube and that is connected between casings located in a formation other than the aquifer through the flange ring.   The intake tube has a plurality of inner connecting rods arranged annularly between positions near the inner periphery of the upper and lower flange rings, and is fixed to the flange ring. The water intake device according to claim 1, wherein a backfilling material filling space is formed between the outer net and the inner net by attaching an inner net to the inner net.   The upper flange ring is composed of two flange rings provided at a required interval between each other, and at least one of the coupling members for coupling the flange rings is composed of a hollow coupling material to form an outer flange ring. The upper end of the hollow binding material is opened on the upper surface of the back surface, and the back filling material is filled into the space for filling the back filling material between the outer net body and the inner net body through the hollow binding material. The water intake device according to claim 2.   The water intake device according to claim 1, wherein a backfilling material is filled between a net body on an outer periphery of the water intake cylinder and an inner peripheral wall surface of the excavation hole.   The water intake device according to claim 4, wherein the backfill material is formed into a spherical body of plastic, and a plurality of grooves are formed in a peripheral surface portion thereof.   A plurality of grooves are respectively formed in one half and the other half of the sphere, and the grooves of the one half and the other half are different in phase by 90 °, and a small hole is formed at the bottom of both grooves. The water intake device according to claim 5 formed corresponding to each groove.

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