JP5222187B2 - Perforated block and method of constructing water collection facility with perforated block - Google Patents

Description

  The present invention is a water treatment facility that removes objects to be removed such as suspensions contained in water to be treated such as clean water, industrial water, industrial water, domestic wastewater, and industrial wastewater. The present invention relates to a perforated block used in a water collection facility for collecting water and a method for constructing the water collection facility.

  In the water collection facility, for example, a filtration layer (treatment layer) filled with a granular medium is supported to support a filtration means (removal means) for removing the suspension, and the suspension is removed through the filtration layer. A perforated block for collecting the treated water (for example, Patent Document 1).

  The perforated block is provided with an outer wall (upper wall / side wall / bottom wall) whose hollow cross section is substantially rectangular, and an inclined inner wall having a substantially inverted V-shaped cross section inside the outer wall. By this inclined inner wall, the inner space of the perforated block is partitioned into a central circulation part and side circulation parts located on both sides of the central circulation part. The upper part of the upper wall, the lateral circulation part, the lateral circulation part, and the central circulation part communicate with each other through a hole. The side walls are provided with reinforcing ribs that extend in the vertical direction and reinforce the strength of the side walls.

  The filtration layer is filled with granular media such as gravel, silica sand, anthracite, and granular activated carbon. If the treated water is passed through the filtration layer in a downward flow from above the filtration means, it is contained in the treated water. Suspension is removed by the filtration layer. The treated water from which the suspended solids have been removed by passing through the filtration layer flows into the side circulation part through the upper wall hole provided in the upper wall of the perforated block by the action of gravity, and further, the side circulation part The water is collected by flowing into the central circulation section from.

Generally, in a water collection facility, a plurality of perforated blocks are installed in a planar shape (two-dimensionally) to support a filtering means. Specifically, the inner space of the plurality of perforated blocks is extended so as to communicate with each other, the plurality of perforated blocks are connected in series, and the plurality of perforated blocks are juxtaposed so that the side walls face each other. Place perforated blocks in parallel. By installing a plurality of perforated blocks in this way, a larger amount of treated water can be collected.
As shown in FIG. 5, when the perforated blocks 20 are arranged in parallel, a filler 30 such as mortar is filled between the opposing side walls 21B. By fixing the filler 30, the juxtaposed perforated blocks 20 are fixed.

JP 2004-346574 A

The upper surface level 21AU at which the upper wall hole of the upper wall opens is formed below the upper surface level 25BU of the bank portion formed at the periphery of the upper wall, and the upper surface level 30U of the filler to be filled is changed to the upper surface level 21AU of the upper wall. It may be constructed so as to be approximately the same. In this case, since the upper surface level 21AU of the upper wall and the upper surface level 30U of the filler coincide with each other, the thickness of the filtration layer can be made uniform, so that uniform filtration can be performed over the entire region of the filtration layer.
If the upper surface level 30U of the filler is set lower than the upper surface level 21AU of the upper wall, the treated water will remain in the region surrounded by the side surfaces of the opposed perforated blocks and the upper surface of the filler. . If the treated water stays in this way, the filtration efficiency decreases. However, if the height levels of the two are the same or the upper surface level 30U of the filler is made higher, the treated water that has passed through the filtering means will hardly stay on the upper surface of the filler.

The upper end position 24U of the reinforcing rib provided on the side wall is formed so as to coincide with the upper surface level 25BU of the bank portion in a cross-sectional view. When the upper surface level 30U of the filler is substantially matched with the upper surface level 21AU of the upper wall formed below the upper surface level 25BU of the bank, the upper end position 24U of the reinforcing rib is above the upper surface level 30U of the filler.
Usually, after filling between the perforated blocks with the filler, a flat finish is performed to flatten the upper surface of the filler. At this time, the reinforcing ribs above the upper surface level 30U of the filler obstruct the flat finish. May be. In this case, the work efficiency of flattening the upper surface level 30U of the filler has been reduced.

  Accordingly, an object of the present invention is to provide a perforated block that facilitates flattening the upper surface level of the filler and a method for constructing a water collection facility including the perforated block.

A first characteristic configuration of a perforated block according to the present invention is surrounded by an upper wall having a plurality of holes, a pair of side walls connected to the upper wall, and a bottom wall connected to the side walls, and the holes In the perforated block having an internal space communicating with the upper wall, the upper end position of the side rib extending in the vertical direction on the outer surface of the side wall is formed at the peripheral edge of the upper wall and above the opening of the hole. It is below the upper surface level of the levee portion to be formed , and the upper end position of the side rib is formed at a height equal to or higher than the upper surface level of the upper wall .

  When the upper end position of the side rib is formed below the upper surface level of the levee as in this configuration, the filler is filled between the perforated blocks, and the flat finish is performed to flatten the upper surface of the filler. Since the vicinity of the upper end of the side rib does not interfere with the flat finishing, the work of flattening the upper surface level of the filler can be performed efficiently.

  Further, in the flat finishing, the upper surface of the filler may be flattened by using the upper end position of the side rib as a mark, and in this configuration, the upper surface level of the filler can be easily finished horizontally.

In the flat finishing, the upper end position of the side rib and the upper surface level of the filler are made to coincide with each other.
According to this configuration, since the upper surface level of the filler can be formed at a height equal to or higher than the upper surface level of the upper wall, the treated water hardly stays on the upper surface of the filler.

The second characteristic configuration of the perforated block according to the present invention is surrounded by an upper wall having a plurality of holes, a pair of side walls connected to the upper wall, and a bottom wall connected to the side walls, and the holes In the perforated block having an internal space communicating with the upper wall, the upper end position of the side rib extending in the vertical direction on the outer surface of the side wall is formed at the peripheral edge of the upper wall and above the opening of the hole. It is in the point provided with the auxiliary rib which is below the upper surface level of the dyke part made and is connected to the inner surface of the dyke part, and the upper surface of the upper wall.

By providing the auxiliary rib of this configuration, it is possible to improve the strength in the horizontal direction of the portion above the upper wall in the bank portion. For example, since the auxiliary rib can be formed in a substantially triangular shape in a sectional view to be a small rib, the structure of the upper surface of the upper wall can be simplified.
When the auxiliary rib is provided in this way, it is possible to suppress the sideward deflection of the portion above the upper wall of the bank and the downward deflection of the upper wall.

  The characteristic structure of the construction method of the water collection facility according to the present invention is the construction method of the water collection facility using any of the perforated blocks described above, and is provided with a plurality of perforated blocks installed in a planar shape. Block installation step, filling step of filling the filler between the perforated blocks arranged in parallel, and a flattening step of flattening the upper surface level of the filler according to the upper end position of the side rib And having the point.

According to this configuration, when performing the flat finishing to flatten the upper surface of the filler, the vicinity of the upper end of the side rib does not interfere with the flat finishing, so that the flat finishing work can be performed efficiently. It will be possible construction method.
Furthermore, when the construction is performed with the upper end position of the side ribs being matched with the upper surface level of the filler, the upper surface of the filler may be flattened using the upper end position of the side rib as a mark. Therefore, in this structure, it becomes the construction method which is easy to finish the upper surface level of a filler horizontally.

It is a perspective view which shows the outline of a water collection facility by a part notch. It is a perspective view of the perforated block of the present invention. It is sectional drawing of the perforated block of this invention. It is a flowchart which shows the construction method of the water collection equipment of this invention. It is sectional drawing which shows the conventional perforated block.

Embodiments of the present invention will be described below with reference to the drawings.
The perforated block of the present invention is an object to be removed in a water treatment facility Y that removes an object to be removed such as a suspension contained in water to be treated such as clean water, industrial water, industrial water, domestic wastewater, and industrial wastewater. Is used in a water collection facility X that collects treated water from which water has been removed (FIG. 1).

As shown in FIGS. 1 to 3, the perforated block 20 is removed from the treated water by flowing the treated water in a downward flow from above the treated layer 11 filled with the granular medium 12. An upper wall 21A for supporting the removing means 10 for removing an object by the processing layer 11, a pair of side walls 21B connected to the upper wall 21A, and a bottom wall 21C connected to the side wall 21B, and passing through the processing layer 11 The treated water from which the objects to be removed are removed is collected in a hollow internal space.
In the upper wall 21A, a plurality of upper wall holes a1 communicating with the internal space are formed.
The side wall 21B is provided with side ribs 24 that extend in the vertical direction on the outer surface of the side wall 21B and reinforce the strength of the side wall 21B.
The upper end position 24u of the side rib 24 is formed on the peripheral edge of the upper wall so as to surround the plurality of upper wall hole portions a1, and is an upper surface level of the bank portion 25 formed above the opening of the upper wall hole portion a1. It is formed below 25bu.

(Removal means)
The removal means 10 in this embodiment is demonstrated as what removes the to-be-removed object contained in to-be-processed water by filtration process. Therefore, the treatment layer 11 becomes a filtration layer. However, the present invention is not limited to such an embodiment, and it is possible to remove the object to be removed contained in the water to be treated by biological treatment. In this case, the treatment layer 11 becomes a biological treatment layer, and for example, the surface of the granular medium 12 is loaded with microorganisms that biologically decompose the object to be removed.

  The treatment layer 11 is filled with a granular medium 12 such as silica sand and anthracite. In the present embodiment, two treatment layers 11 are provided, and a silica sand layer 11a and an anthracite layer 11b are arranged in order from the lowest layer. Of course, the configuration of the processing layer 11 is not limited to this, and other configurations may be used.

  By supplying the treated water from the drainage trough 50 provided above the removing means 10 to the treated layer 11 configured as described above and passing the treated layer 11, the object to be removed contained in the treated water is removed. It is removed by the treatment layer 11. In some cases, the treated water is supplied directly rather than via the drainage trough 50.

(Perforated block)
The perforated block 20 is disposed below the removing means 10 and supports the removing means 10. In the present embodiment, a perforated plate 60 is disposed between the removing means 10 and the perforated block 20.

  The perforated block 20 is connected to the inner side of the outer wall 21 (upper wall 21A, side wall 21B, bottom wall 21C) that is hollow and has a substantially rectangular cross section, and the inner space of the perforated block 20 into a plurality of spaces. An inclined inner wall 22 to be divided is provided.

  The perforated block 20 may be formed of any material as long as the material has excellent corrosion resistance and pressure resistance. For example, if it is formed by foam molding of high-density polyethylene, the weight can be reduced, so that workability is good in terms of transportation and construction, which is preferable.

  The upper wall 21A is in direct contact with the lower surface of the removing means 10 or indirectly supports the removing means 10 via the perforated plate 60. The side wall 21B is a pair of opposing walls connected to the upper wall 21A, and the bottom wall 21C is connected to the pair of side walls 21B. Further, the inclined inner wall 22 is formed so that the cross section thereof is substantially inverted V-shaped. Thereby, the internal space of the perforated block 20 is partitioned into a central circulation part A and side circulation parts B located on both sides of the central circulation part A. Thus, although the internal space of the perforated block 20 is divided into three spaces by the inclined inner wall 22, it is not limited to this mode.

  The upper part of the upper wall 21A and the side flow part B communicate with each other via a plurality of upper wall holes a1 formed in the upper wall 21A. Further, the side circulation part B and the central circulation part A communicate with each other via a first inner wall hole part b1, a second inner wall hole part b2 and a third inner wall hole part b3 formed in the inclined inner wall 22. The treated water from which the object to be removed has passed through the treatment layer 11 passes through the perforated plate 60 due to the action of gravity, and then flows down to the side circulation part B through the upper wall hole part a1, and further to the first. Water flows down to the central flow section A through the inner wall hole b1, the second inner wall hole b2, and the third inner wall hole b3 and is collected. The treated water flows down the flume 70 provided below the perforated block 20 through a bottom wall opening (not shown) formed on the bottom wall 21C of the perforated block 20, or is connected to the central circulation portion A. A pipe (not shown) is flowed down and conveyed to a predetermined water tank.

  In the present invention, the upper end position 24 u of the side rib 24 is formed below the upper surface level 25 bu of the bank portion 25.

When the upper end position 24u of the side rib 24 is formed below the upper surface level 25bu of the bank portion 25, the filler 30 is filled between the perforated blocks 30, and the flat finish is performed to flatten the upper surface of the filler 30. Therefore, the vicinity of the upper end of the side rib 24 does not interfere with the flat finishing.
Furthermore, in the flat finishing, the upper surface of the filler 30 may be flattened using the upper end position 24u of the side rib 24 as a mark.

  Specifically, the upper end position 24u of the side rib 24 is preferably formed 5 mm or more below the upper surface level 25bu of the bank portion 25, and more preferably 7 mm or more below. If it is 5 mm or more below, in the flat finishing operation, it becomes difficult for the filler 30 to enter the upper surface of the upper wall 21 </ b> A beyond the bank portion 25. Moreover, if it is 7 mm or more below, even if it is a case where the height difference of the filler 30 generate | occur | produces when the filler 30 is inject | poured between perforated blocks, the filler 30 will pass the embankment part 25 and upper wall 21A. It becomes difficult to invade the top surface.

The upper surface level of the upper wall 21A is formed below the upper surface level 25bu of the bank portion 25. A plurality of upper wall rib portions 23a are formed on the upper wall 21A so as to correspond to the arrangement positions of the side ribs 24 and are formed across the embankment portions 25 facing each other.
On the upper surface of the upper wall 21A, an upper wall second rib portion 23b that perpendicularly intersects with the upper wall rib portion 23a is provided. In the present embodiment, a case is shown in which ten upper wall rib portions 23a and one upper wall second rib portion 23b are formed, but the present invention is not limited to this.
The upper surface of the upper wall 21A is divided into a plurality of sections by these rib portions 23a and 23b. By providing these rib portions 23a and 23b, the pressure resistance of the upper wall 21A can be enhanced, and the deflection of the upper wall 21A due to the load of the removing means 10 can be prevented.

  Between the opposing upper wall rib portions 23a, auxiliary ribs 23c connected to the inner side surface of the bank portion 25 and the upper surface of the upper wall 21A are provided. The auxiliary rib 23c has a substantially triangular shape in a sectional view.

By providing the upper wall rib portion 23a on the upper wall 21A across the embankment portion 25 that faces the disposition location of the side ribs 24, the horizontal strength of the embankment portion 25 in the upper part of the upper wall 21A is increased. Can be improved.
Further, when the auxiliary rib 23c is provided between the opposing upper wall rib portions 23a, the horizontal strength of the portion between the plurality of upper wall rib portions 23a on the side wall 21B can be improved. By providing the auxiliary rib 23c, it is possible to more reliably suppress the upper wall 21A from being bent downward by the load of the removing means 10.

The upper end position 24u of the side rib 24 is formed at a height equal to or higher than the upper surface level 21au of the upper wall 21A.
In the flat finishing, the upper end position 24au of the side rib 24 and the upper surface level 30u of the filler 30 are made to coincide with each other. According to this configuration, since the upper surface level 30u of the filler 30 can be formed at a height equal to or higher than the upper surface level 21au of the upper wall 21A, the treated water that has passed through the removing means 10 can easily flow down without being biased. Uniform filtration can be performed over the entire region of the filtration layer 11.

  The perforated plate 60 may be placed on the upper surfaces of the rib portions 23a and 23b, or may be disposed in each section. The perforated plate 20 is fixed to the rib portions 23a, 23b, the upper end of the side wall 21B or the upper wall 21A by tapping screws. For example, the porous plate 20 may be configured by joining a large number of beads having a diameter of several mm. As the beads, ceramics, sintered metals, etc. can be used in addition to plastics such as polyolefin.

(Filler)
The filler 30 is filled between the perforated blocks 20 when the perforated blocks 20 are juxtaposed.
As the filler 30, a known filler can be used as long as it has a mode of solidifying with time after being poured into a gap or the like such as mortar or concrete. The solidified filler 30 fills the gaps between the perforated blocks 20 arranged side by side, and firmly adheres and fixes the perforated blocks 20 to each other, thereby removing the removing means 10 placed above the perforated blocks 20. It can be supported stably.
When the flume 70 is formed below the perforated block 20 and the filler 30, in order to prevent the filler 30 from falling on the flume 70, between the perforated blocks 20, the side walls 21B A bridging (not shown) for receiving the flume 70 is disposed below.

(Construction method of water collection equipment)
As shown in FIG. 4, the water collecting facility X of the present invention includes a perforated block installation process P1, a filling process P2, and a flattening process P3.

In the perforated block installation step P1, a plurality of perforated blocks 20 are installed in a planar shape.
In the filling step P2, the filler 30 is filled between the perforated blocks 20 arranged in parallel.
In the flattening step P3, the upper surface level 30u of the filler 30 is flattened according to the upper end position 24u of the side rib 24.

  In this construction method, when flat finishing is performed to flatten the upper surface of the filler 30, the vicinity of the upper ends of the side ribs 24 does not interfere with the flat finishing. Further, when the upper end position 24u of the side rib 24 is aligned with the upper surface level 30u of the filler 30, the upper surface of the filler 30 is flattened using the upper end position 24u of the side rib 24 as a mark. That's fine.

(Back washing process)
As the water to be treated is filtered by the water collecting facility X, the treatment layer 11 is clogged with the removal object over time. If the clogging occurs, the filtration performance of the treatment layer is lowered. Therefore, the to-be-removed thing with which the process layer was clogged is removed regularly by backwashing. By performing the backwashing treatment, the filtration performance of the treatment layer can be restored.

The backwashing treatment of the present embodiment is performed by a backwashing medium such as a gas or a liquid in the central circulation part A via a flume 70 provided below the perforated block 20 or a pipe connected to the central circulation part A. Circulate. Specifically, the medium for backwashing is removed from the central circulation portion A through the inner wall hole portions b1 to b3 of the inclined inner wall 22, the upper wall hole portion a1 of the upper wall 21A, and the porous plate 60. The layer 11 is ejected. The ejected backwash medium can remove foreign matters (objects to be removed) clogged in the treatment layer 11.
In this embodiment, treated water is transported to a predetermined reservoir by piping during the water collection process, but backwashing is performed in a direction opposite to the direction in which the treated water is transported to the predetermined reservoir during the backwash process. The working medium is circulated through the pipe.

  The present invention is a water treatment facility that removes objects to be removed such as suspensions contained in water to be treated such as clean water, industrial water, industrial water, domestic wastewater, and industrial wastewater. It can be used for perforated blocks used in water collection facilities that collect water and construction methods for water collection facilities.

X Water collecting facility 20 Perforated block 21A Upper wall 21B Side wall 21C Bottom wall 21au Upper wall upper surface level 23c Auxiliary rib 24 Side rib 24u Side rib upper end position 25 Levee portion 25bu Upper surface level 30 of dike portion Filler 30u Upper surface Level a1 Upper wall hole part P1 Perforated block installation process P2 Filling process P3 Flattening process

Claims (3)

In a perforated block having an inner wall that is surrounded by an upper wall provided with a plurality of holes, a pair of side walls connected to the upper wall, and a bottom wall connected to the side walls, and communicated with the holes,
The upper end position of the lateral ribs extending in the vertical direction in the outer surface of said side wall, Ri downward der than the upper surface level of the dike portion formed above the opening of the peripheral edge is formed and the hole of the upper wall,
The upper end position of said lateral ribs, formed tear Ru perforated block to the upper surface level over the height of the upper wall. In a perforated block having an inner wall that is surrounded by an upper wall provided with a plurality of holes, a pair of side walls connected to the upper wall, and a bottom wall connected to the side walls, and communicated with the holes,
  The upper end position of the side ribs extending in the vertical direction on the outer surface of the side wall is below the upper surface level of the levee portion formed at the periphery of the upper wall and above the opening of the hole,
  A perforated block provided with auxiliary ribs connected to the inner surface of the bank and the upper surface of the upper wall. It is the construction method of the water collection facility which uses the perforated block of Claim 1 or 2 ,
A perforated block installation step of installing a plurality of the perforated blocks in a planar shape;
A filling step of filling a filler between the perforated blocks arranged in parallel;
A flattening step of flattening the upper surface level of the filler in accordance with the upper end position of the side ribs.

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