JP4168314B2 - Sand collection device for sand basin - Google Patents

Sand collection device for sand basin Download PDF

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Publication number
JP4168314B2
JP4168314B2 JP2001096498A JP2001096498A JP4168314B2 JP 4168314 B2 JP4168314 B2 JP 4168314B2 JP 2001096498 A JP2001096498 A JP 2001096498A JP 2001096498 A JP2001096498 A JP 2001096498A JP 4168314 B2 JP4168314 B2 JP 4168314B2
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Japan
Prior art keywords
sand
groove
nozzle
basin
water
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JP2001096498A
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Japanese (ja)
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JP2002282609A (en
Inventor
弘 板倉
敏昭 森永
一成 落合
貴司 鈴木
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株式会社日立プラントテクノロジー
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand basin facility for sedimenting and removing sand in sewage in a sewage treatment facility or the like, and an operation method thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sand basin facility has been used in which a sand basin is provided in order to remove sand and the like contained in sewage, and the sand is settled there and removed. In order to remove the sand settling in the sand basin, a nozzle is placed at the bottom of the pond, pressure water is jetted from this nozzle to flush the accumulated sand, and this is collected in a separate sand collection pit, where it is collected. There is a sand basin facility that discharges sand together with water with a sand pump arranged inside.
In JP-A-7-100305 (known example (1)), a trough is provided toward the sand collecting pit at the center in the width direction of the sand basin, and a number of small troughs are provided so as to be orthogonal to the trough. There is disclosed a sand basin facility in which a nozzle for jetting pressure water is arranged at the upper end between each small trough, and an underwater sand pump for sanding sand collected in a sand collecting pit is arranged. When removing the sediment from the sand basin facility, the sand basin is emptied, the bottom of the pond is exposed, pressure water is ejected from the nozzle, and the sand accumulated on the bottom of the pond is passed through the small trough and trough along with the water flow. They are collected in a sand collection pit and discharged from there by a sand pump.
[0003]
Japanese Patent Laid-Open No. 8-229310 (Prior Art Example 2) discloses that the bottom surface of a sand basin is inclined from the upstream side to the downstream side, a sand pit is provided at the downstream end, and a jet pump is provided in the sand pit. A sand basin facility is disclosed in which a nozzle for ejecting pressure water in the flow direction of the raw water is disposed on the bottom surface of the sand basin. When removing the sand in the sand basin facility, the inflow of the raw water is stopped and the water level is lowered to a predetermined level, and then the pressure water is ejected. The other operations are the same as described above.
[0004]
[Problems to be solved by the invention]
However, in the settling basin facility of the known example {circle around (1)}, it is necessary to empty the water to such an extent that the bottom of the settling basin is exposed.
Further, in the sand basin facility of the known example {circle around (2)}, since the jet pump is used, there is a problem that the power for operating it is large.
The present invention improves the above-described problems, and provides a sand collecting device for a sand basin facility that can perform sand removal work without eliminating water in the sand basin and that uses less power. For the purpose.
[0005]
[Means for Solving the Problems]
Nozzles present invention, for injecting a Atsumarisuna pits and grooves plural rows arranged in parallel so that the downward gradient towards the said population sand pits, water Atsumarisuna pit direction into the groove in Ikezoko When, wherein the grooves are formed in the precast U-shaped concrete trough, the width of the groove, Ru der those characterized in that a 300 to 500 mm. The present invention also includes a sand collection pit at the bottom of the pond, a plurality of grooves arranged in parallel toward the sand collection pit, and a nozzle for ejecting water in the direction of the sand collection pit. The groove is formed of a precast concrete block and a U-shaped metal plate, and the groove has a width of 300 to 500 mm. Furthermore the 1-stage this one provided a nozzle with respect to the width direction of the groove in the groove, Ru der those characterized by comprising a plurality of stages in the longitudinal direction of the groove. Furthermore pressure water supplied to the nozzle is Ru der which being a 0.1~0.4MPa. The or before Symbol nozzle connected to 40A or more tubes, it is characterized in that to supply later intake and sewage from sand basin.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a sand basin facility of the present invention will be described with reference to the drawings.
FIG. 1 is an elevational view showing an overall outline relating to a sand basin facility of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged sectional view taken along line XX of FIG.
In the figure, 1 is a sand basin, and sewage flows in from the direction of arrow I, and a screen 2 is attached to the sewage inflow side, thereby removing relatively large suspended matter in the sewage flowing into the sand basin 1. .
A sand collecting pit 3 is formed in the center of the bottom of the sand basin 1 in the longitudinal direction, and six rows of grooves 4 are provided at the bottom of the pond so as to be inclined downward from both sides toward the sand collecting pit 3. It is done.
Each groove 4 is formed by laying six commonly used concrete U-shaped troughs 41 in parallel.
A sand pump 5 is disposed in the sand collecting pit 3, and the sand pump 5 can be moved up and down by a lifting device (not shown). Then, it is arranged in the sand collecting pit 3.
[0007]
One nozzle 6 for water ejection is arranged in the width direction of the groove 4 at the bottom 41 of each groove 4, and when this is one stage, three stages are arranged in the longitudinal direction of the groove 4. The nozzle 6 is then set so that water is ejected in the direction of the sand collection pit 3. Here, the number of nozzles 6 is one in the width direction of the groove 4. The number of nozzles 6 increases the sand collecting ability, but the unnecessary sand collecting ability is unnecessary, and the construction is complicated. Is one.
In addition, by disposing the nozzle 6 at the bottom of the groove 4, the water ejected from the nozzle 6 and the sand are concentrated in a relatively narrow area in the groove 4, so that the kinetic energy of the water ejected can be used effectively. Can do.
A 100 A water pipe 7 is laid under the U-shaped trough 41 forming the groove 4 and buried with gravel, and a 40 A water pipe 8 branches from the water pipe 7 and is coupled to each nozzle 6. The
[0008]
A pump well 9 is provided on the outflow side of the settling basin 1 to temporarily collect the sewage from which sand has been removed in the settling basin 1, and this sewage is first transferred to the next step by the transfer pump 10. Transfer to sedimentation basin (not shown). The pump well 9 is provided with a supply pump 11. The supply pump 11 supplies sewage in the pump well 9 to the water tank 12, and the water pump 12 supplies the sewage water to the water pipe 7. Supply water (sewage). Water (sewage) supplied from the pressurizing pump 13 is ejected from the nozzle 6 into the groove 4 via the water pipes 7 and 8.
In the present embodiment, the sewage from which sand has been removed to some extent is taken from the pump well 9 and supplied to the nozzle 6. However, the present invention is not limited to this. For example, the overflow water from the first sedimentation basin or the final You may supply overflow water from the sedimentation basin.
Moreover, when using the water from a pump well as described above, or overflow water, it is desirable to use the nozzle 6 and the water piping 8 connected to it as a pipe | tube with a diameter of 40A or more. This is because those waters still contain foreign matters, and clogging may occur in tubes of less than 40A.
[0009]
As shown in FIG. 4, the nozzle 6 is divided into a group A, a group B, and a group C, and a pipe line is formed so that each group can independently select when the pressure water is ejected. For example, first, pressure water is ejected from the nozzle 6 of the group C, the sand accumulated in the portion is swept to the part of the group B, and then pressure water is ejected from the nozzle 6 of the group B to remove the sand. Then, the pressure water is ejected from the nozzle 6 of the A group, and the sand in that portion is transferred to the sand collecting pit 9. By doing so, there is no big difference between the pressure collection from the A, B, C group and the sand collection effect at one time, but the discharge amount of the pressure water pump 8 is only 1/3. Can be small. Further, as shown in FIG. 5, the nozzle 6 may be divided into nozzle groups D, E, and F in the inflow direction of sewage.
[0010]
In the sand basin, the sand removal operation is performed at an appropriate interval, for example, about once a week. At that time, the inflow of sewage into the sand basin 1 is stopped and the flow of water in the sand basin 1 is stopped. Thereafter, water is ejected from the nozzle 6 and the earth and sand deposited on the bottom of the pond is transferred into the sand collecting pit 3. In the meantime, the sand pump 5 installed in the sand collection pit 3 is in operation, and the soil and water transferred into the sand collection pit 3 are discharged to the outside of the settling basin 1 to be treated appropriately. .
[0011]
Next, when the pressure of the water supplied to the nozzle 6 is changed, how much distance the sand accumulated in the groove 4 is removed and moved, and the pressure of the water supplied to the nozzle 6 is kept constant. An experimental example in which the behavior of the sand deposited in the groove 4 when the width of the groove 4 is changed will be described.
In FIG. 6, the width of the groove 4 is set to 350 mm, the height of sand accumulation is set to 230 mm, and the pressure of the water supplied to the nozzle 6 and the sand removal movement by the water ejected from the nozzle 6 at a water depth of 1.5 m. It is the figure which showed the relationship with distance. According to the result, it was found that a sand removal movement distance of about 2 m at a pressure of 0.1 MPa and about 5 m at a pressure of 0.35 MPa can be obtained. This value is an important factor in determining the number of stages of nozzles 4 arranged in the groove 4, but this value of 2m to 5m is a waste of pump power due to the complexity of construction and the increased pressure of water supplied to the nozzle. Considering this point, it is considered that the value is appropriate.
[0012]
Next, the pressure of water supplied to the nozzle 4 was set to 0.3 MPa, the height of sand deposition was set to 230 mm, and the relationship between the width of the groove 4 and the sand removal movement distance was examined at a water depth of 1.5 m. As a result, the sand in the groove 4 was almost completely removed until the groove width was 350 mm. However, when the groove width exceeded 350 mm, the remaining sand having a substantially triangular shape was formed on both front sides of the nozzle 4. But this was almost completely removed by the nozzle behind. However, if the width of the groove exceeds 500 mm, the above-mentioned remaining sand cannot be removed even by the nozzle behind, which is inappropriate from the viewpoint of sand collection. Even if the width of the groove is less than 300 mm, it is of course satisfactory from the viewpoint of sand collection, but it is not preferable because of the complexity of the construction as described above.
[0013]
FIG. 7 is a cross-sectional view showing another embodiment of the structure of the groove 4, and FIG. The precast flat concrete block 42 is fixed by standing in parallel with the bottom of the pond with long bolts 43, and a U-shaped metal plate 44 is inserted between the concrete blocks 42. Secure to the concrete block 42 with bolts 45. The concrete block 42 and the metal plate 44 constitute the groove 4.
Compared to forming the groove 4 by mortar construction by using the precast U-shaped concrete trough 41 or using the precast concrete block 42 and the metal plate 44 to form the groove 4. The required man-hours can be greatly reduced.
[0014]
【The invention's effect】
Since the present invention is configured as described above, it is possible to provide a sand collecting device for a sand basin facility that can perform sand removal work without eliminating water in the sand basin and that uses less power. .
[Brief description of the drawings]
FIG. 1 is a system diagram showing the entirety of an embodiment according to the present invention.
FIG. 2 is a plan view of a sand basin according to the present invention.
3 is an enlarged cross-sectional view taken along the line XX of FIG.
FIG. 4 is a plan view showing an embodiment of a nozzle group division state according to the present invention.
FIG. 5 is a plan view showing another embodiment of the division state of the nozzle group according to the present invention.
FIG. 6 is a diagram showing the relationship between the pressure of water supplied to the nozzle according to the present invention and the removal movement distance of sedimentation.
FIG. 7 is a cross-sectional view of another embodiment of a groove according to the present invention.
FIG. 8 is an enlarged view of a part S in FIG.
[Explanation of symbols]
1 sand settling basin, 3 sand collection pits, 4 grooves, 5 sand pump, 6 nozzles,
7 water piping, 8 water piping, 9 pump wells, 11 supply pumps,
12 water tanks, 13 pressure pumps, 41 U-shaped concrete troughs,
42 concrete blocks, 44 metal plates

Claims (5)

  1. Bei and Atsumarisuna pits Ikezoko, and grooves plural rows arranged in parallel so that the downward gradient towards the said population sand pits, a nozzle for spouting water Atsumarisuna pit direction into the groove, the e,
    The groove is formed of a precast U-shaped concrete trough,
    A sand collecting device for a sand basin , wherein the groove has a width of 300 to 500 mm.
  2. A sand collecting pit at the bottom of the pond, a plurality of grooves arranged in parallel so as to be inclined downward toward the sand collecting pit, and a nozzle for ejecting water in the direction of the sand collecting pit in the groove ,
    The groove is formed of a precast concrete block and a U-shaped metal plate,
    A sand collecting device for a sand basin, wherein the groove has a width of 300 to 500 mm.
  3. The sand collecting apparatus for a sand settling basin according to claim 1 or 2 , wherein one nozzle is provided in the groove in the width direction of the groove, and this is provided as a single stage, and a plurality of stages are provided in the longitudinal direction of the groove. .
  4. Pressure water supplied to the nozzle, collecting sand device sand basin according to any one of claims 1-3, characterized in that the 0.1~0.4MPa.
  5. The sand collecting device for a sand settling basin according to claim 3, wherein a pipe of 40A or more is connected to the nozzle to supply sewage taken after the settling basin.
JP2001096498A 2001-03-29 2001-03-29 Sand collection device for sand basin Expired - Fee Related JP4168314B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001096498A JP4168314B2 (en) 2001-03-29 2001-03-29 Sand collection device for sand basin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001096498A JP4168314B2 (en) 2001-03-29 2001-03-29 Sand collection device for sand basin

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JP4168314B2 true JP4168314B2 (en) 2008-10-22

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5134699B2 (en) * 2004-01-13 2013-01-30 アクアインテック株式会社 Sedimentation basin equipment
JP4569870B2 (en) * 2005-01-24 2010-10-27 株式会社石垣 Foreign matter discharge method and foreign matter discharge device for pump well
KR100738972B1 (en) 2007-02-09 2007-07-12 노재숙 Pipe nozzle type sludge collector
JP4881815B2 (en) * 2007-08-10 2012-02-22 水ing株式会社 Sand collector
JP5291942B2 (en) * 2008-01-22 2013-09-18 株式会社industria Foreign matter removal device in processing tank
JP5308688B2 (en) * 2008-02-20 2013-10-09 株式会社industria Treatment liquid filtration device in treatment tank
JP4981734B2 (en) * 2008-03-31 2012-07-25 株式会社クボタ Sand basin
JP5782626B2 (en) * 2011-03-02 2015-09-24 アクアインテック株式会社 sand basin
JP6338127B2 (en) * 2016-11-29 2018-06-06 アクアインテック株式会社 Sand basin

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