JP2010234343A - Water collecting apparatus, perforated block to be used in water collecting apparatus, and method for constructing water collecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water collecting apparatus, which can prevent the positional shift of perforated blocks and fillers when they are subjected to a downward load and destruction of solidified fillers, a porous block to be used for a water collecting apparatus, and a method for constructing a water collecting apparatus. <P>SOLUTION: The water collecting apparatus includes perforated blocks 20 that support a removal means 10 for removing objects to be removed contained in water to be treated with the use of a treatment layer 11 by applying water to be treated downward from above the treatment layer 11 filled with a granular medium 12 and collect treatment water that has passed through the treatment layer 11 so as to collect objects to be removed into the hollow internal space, and a filler 30 in which each space between perforated blocks 20 is filled when a plurality of perforated blocks 20 are juxtaposed, wherein a downward reinforcing member 42 is provided below the intermediate position in the height direction of the perforated blocks 20 in the filler 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention removes to-be-removed objects such as suspended matters contained in treated water such as clean water, industrial water, industrial water, domestic wastewater, and industrial wastewater, and collects treated water from which the to-be-removed substance has been removed. The present invention relates to a water collecting device that performs processing, a perforated block used in the water collecting device, and a construction method of the water collecting device.

  A water collection device used in water treatment facilities, for example, includes a filtration layer (treatment layer) filled with a granular medium, supports a filtration means (removal means) for removing the suspension, and passes through the filtration layer. A perforated block that collects treated water from which the object to be removed has been removed is provided (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 internal 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 are communicated with each other through a hole.

  The filtration layer is filled with a granular medium such as silica sand, anthracite, and granular activated carbon. When the treated water is passed through the filtration layer in a downward flow from above the filtration means, the suspension contained in the treated water. Things etc. are removed by the filtration layer. The treated water from which the suspended solids have been removed by passing through the filtration layer flows down to the side circulation part via the upper wall hole provided in the upper wall of the perforated block by the action of gravity, and further to the side circulation part. The water is collected by flowing down to the central distribution section.

In general, in a water collecting apparatus, 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. 9, 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.

As the water to be treated is filtered by the water collecting device, the filtration layer becomes clogged with the suspension over time. If the clogging occurs, the filtration performance of the filtration layer is lowered. Therefore, the backwash process is regularly performed to remove the suspended matter clogged in the filtration layer. By performing the backwash process, the filtration performance of the filtration layer can be restored.
In the backwash process, liquid (water) or air, which is a backwash medium, is supplied from below to above the filtering means. Specifically, as shown in FIGS. 9 and 10, the backwash medium is perforated from the perforated block 20 and the flume (water channel) 70 provided below the filler 30 through the bottom wall opening c1. It passes through the internal space of the block 20 (central flow portion A / side flow portion B) and is supplied to the filtering means 10 via the upper wall hole a1.

  At this time, the perforated block 20 receives an upward load by the backwash medium. Then, for example, there is a possibility that the perforated block 20 and the filler 30 are displaced from each other in the vertical direction due to the stress that the perforated block 20 tends to move relatively upward. In order to avoid this inconvenience, a rib 26 having a receiving surface 26a inclined upward is formed on the side wall of the perforated block so that the upward load can be transmitted from the receiving surface 26a to the filler 30. With this structure, even when an upward load is applied to the perforated block 20, the relative position of the perforated block 20 with respect to the filler 30 can be fixed by the ribs 26. It is possible to prevent the materials 30 from being displaced from each other in the vertical direction.

  Furthermore, if the filler 30 is subjected to an upward load by the backwash medium, a tensile stress may act on the upper region of the filler 30 to break the solidified filler. Usually, in order to avoid this inconvenience, the reinforcing member 40 such as a reinforcing bar is horizontally disposed in the upper region of the filler 30 in order to increase the strength of the upper region. Thereby, the tolerance with respect to the tensile stress which generate | occur | produces when receiving an upward load can be improved, and it can prevent beforehand that the upper side area | region of the solidified filler is destroyed.

JP 2004-346574 A

  As described above, the disadvantages that arise when the perforated block and the filler are subjected to an upward load by the backwash medium are the ribs with the receiving surfaces inclined upward and the upper region of the solidified filler. The problem can be solved by providing the arranged reinforcing member.

  On the other hand, since the filtering means is placed above the perforated block and the filler, the perforated block and the filler always receive a downward load due to the weight of the filtering means. In the rib with the receiving surface inclined upward, the downward load cannot be transmitted to the filler, and therefore, when the width of the flume is large, for example, the perforated block is lowered downward by the downward load. There is a possibility that the perforated block and the filler are misaligned with each other in the vertical direction due to the large stress acting on the relative movement. Further, if the filler is subjected to the downward load, there is a risk that the solidified filler is destroyed by the action of tensile stress in the lower region of the filler.

  In order to avoid such inconvenience, a receiving shelf 90 (FIG. 10) for receiving the load of the perforated block and the filler on the bottom surface thereof is disposed at the end of the flume to reduce the width of the flume, The stress generated when the filler receives the downward load is reduced.

  However, when the receiving shelf is provided as described above, the manufacturing cost and process increase.

  Accordingly, an object of the present invention is to provide a water collecting device and a collector that can prevent the positional displacement of the perforated block and the filler and the destruction of the solidified filler even when the perforated block and the filler receive a downward load. It is in providing the construction method of the perforated block used with a water apparatus, and a water collection apparatus.

  The first characteristic configuration of the water collecting apparatus according to the present invention is such that water to be treated is passed in a downward flow from above the treatment layer filled with the granular medium, and an object to be removed contained in the treatment water is removed from the treatment layer. A perforated block that supports the removing means to remove the collected water and collects the treated water from which the object to be removed has passed through the treatment layer in a hollow internal space, and a plurality of the perforated blocks arranged side by side And a filler filling between the perforated blocks, and a side rib for transmitting a load from above to the perforated block to the filler is formed on a side wall of the perforated block. It is in.

The perforated block receives an upward load by the backwash medium and always receives a downward load due to the weight of the removing means. When the upward load is received, a stress that the perforated block tends to move upward is applied, and when the downward load is received, a stress that the perforated block tends to move downward is applied.
According to this configuration, even if a downward load is applied to the perforated block, the relative position of the perforated block with respect to the filler is fixed in order to transmit these loads to the solidified filler by the side ribs. can do. Therefore, it is possible to prevent the perforated block and the filler from being displaced from each other in the vertical direction.

  The 2nd characteristic structure of the water collecting apparatus which concerns on this invention exists in the point which has arrange | positioned the downward reinforcement member below the intermediate position in the height direction of the said perforated block in the said filler.

  According to this configuration, since the lower reinforcing member exists in the lower region of the solidified filler, tensile stress is hardly generated in the lower region. Therefore, it is possible to prevent the lower region of the solidified filler from being destroyed.

  The third characteristic configuration of the water collecting apparatus according to the present invention is that an upper reinforcing member is disposed in the filler above the lower reinforcing member.

  According to this configuration, the solidified filler can be sandwiched between the upper end surface of the side rib and the upper reinforcing member. Similarly, the solidified filler can be sandwiched between the lower end surface of the side rib and the lower reinforcing member. Accordingly, the degree of coupling of the perforated block, the filler, the upper reinforcing member, and the lower reinforcing member can be further strengthened. Therefore, it is possible to reliably prevent the perforated block and the filler from being displaced from each other.

  The first characteristic configuration of the perforated block according to the present invention is that the treated water is passed downwardly from above the treated layer filled with the granular medium, and the removal object contained in the treated water is passed by the treated layer. A top wall for supporting the removing means to be removed, a side wall connected to the top wall, and a bottom wall connected to the side wall, and the treated water from which the object to be removed has been removed through the treatment layer is hollow In the perforated block that collects water in the inner space of the perforated block, when a plurality of the perforated blocks are juxtaposed, the load from above that is received by the perforated block is transmitted to the filler filled between the perforated blocks. A side rib is formed on the side wall.

The perforated block always receives a downward load from above due to the weight of the filtering means. When the downward load is received, a stress is exerted on the perforated block 20 so as to relatively move downward.
In this configuration, since the side ribs that transmit the load from the top received by the perforated block to the filler are formed, even if a downward load is applied to the perforated block, these side ribs Since the load is transmitted to the solidified filler, the relative position of the perforated block with respect to the filler can be fixed. Therefore, it is possible to prevent the perforated block and the filler from being displaced from each other in the vertical direction.

  The 2nd characteristic structure of the perforated block which concerns on this invention exists in the point which provided the opposing surface part extended facing the said side rib substantially parallel to the said side wall.

  According to this configuration, the upward load and the downward load received by the perforated block by the side ribs are reliably transmitted to the filler, and it is ensured that the perforated block and the filler are displaced from each other in the vertical direction. In addition, it is possible to reliably prevent the perforated block and the filler from being displaced in the direction away from each other by the facing surface portion.

  The 3rd characteristic structure of the perforated block which concerns on this invention exists in the point comprised so that the lower end surface of the said side rib may cross | intersect with the said perpendicular | vertical or acute angle with respect to the said side wall.

  For example, according to this configuration, when the lower end surface of the side rib intersects with the side wall at an obtuse angle, the downward load received by the perforated block causes the filler to peel from the side rib. A component force is generated. On the other hand, by forming the lower ribs of the side ribs so as to intersect perpendicularly to the side walls as in this configuration, the above-described generation of the component force can be prevented. Furthermore, by constituting the lower end surface of the side rib so as to intersect at an acute angle with respect to the side wall, a component force can be generated on the side where the filler bites into the side rib. As a result, the downward load can be reliably transmitted to the filler by configuring the side ribs so that the lower end surfaces of the side ribs intersect perpendicularly or at an acute angle with respect to the side walls.

The characteristic structure of the construction method of the water collecting apparatus according to the present invention is that the treated water obtained by treating the treated water is collected in the hollow internal space, and the side ribs that transmit the load from above to the adjacent filler are provided on the side walls. A perforated block installation step of installing a plurality of perforated blocks prepared in a flat shape;
A reinforcing member disposing step of disposing a lower reinforcing member below the intermediate position in the height direction of the perforated block between the perforated blocks disposed in parallel;
And a filling step of filling the filler between the perforated blocks arranged in parallel.

According to this configuration, it is possible to form a water collecting device in which a plurality of perforated blocks are disposed below, the space between each perforated block is filled with the filler, and the removing means is stacked above the perforated blocks. In particular, in this construction method, since the side wall of the perforated block is provided with side ribs that transmit the load from above to the filler, the relative position of the perforated block with respect to the filler solidified by the side ribs can be fixed. It is possible to form a water collecting device that can prevent the perforated block and the filler from being displaced from each other in the vertical direction.
Furthermore, in this configuration, since the filler is filled with the lower reinforcing member disposed below the intermediate position in the height direction of the perforated block, an upward load or a downward load is applied to the perforated block. Even so, it is difficult to generate a tensile stress in the lower region of the solidified filler, and it is possible to form a water collecting device that can prevent the lower region of the solidified filler from being destroyed.

It is a perspective view which shows the outline of the water collecting apparatus of this invention by a partial notch. It is a perspective view of the perforated block of the present invention. It is sectional drawing which showed arrangement | positioning of a perforated block, a filler, and a reinforcement member. It is the side view which showed arrangement | positioning of a perforated block and a reinforcement member. It is principal part sectional drawing of a side rib. It is principal part sectional drawing of the side rib of another embodiment. It is the side view which showed arrangement | positioning of the reinforcement member of another embodiment. It is a flowchart of each process of the construction method of the water collecting apparatus of this invention. It is sectional drawing which showed arrangement | positioning of the perforated block, the filler, and the reinforcement member in the conventional water collecting apparatus. It is the side view which showed the arrangement | positioning of the conventional perforated block and a reinforcement member.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the water collecting apparatus X of the present invention is a water that removes suspended matter (subject to be removed) contained in water to be treated such as clean water, industrial water, industrial water, domestic wastewater, and industrial wastewater. In the treatment facility Y, it is used to collect treated water from which suspended matters have been removed.

  As shown in FIGS. 1 to 5, the water collecting device X is to be removed by flowing the water to be treated in a downward flow from above the treatment layer 11 filled with the granular medium 12. A perforated block 20 that supports the removing means 10 for removing the waste water by the treatment layer 11 and collects treated water from which the objects to be removed have passed through the treatment layer 11 into a hollow internal space, and a plurality of perforated blocks And a filler 30 filled between the perforated blocks 20 when juxtaposed with each other, and in the filler 30 there is an upper reinforcing member above an intermediate position in the height direction of the perforated block 20. 41 and a lower reinforcing member 42 are disposed below the intermediate position.

(Removal means)
The removal means 10 of this embodiment demonstrates the case where the to-be-removed object contained in to-be-processed water is removed by a 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, anthracite, or granular activated carbon. In the present embodiment, two treatment layers 11 are provided, and an example in which the silica sand layer 11a and the anthracite layer 11b are disposed in order from the lowest layer is illustrated, but is not limited thereto.
Water to be treated is supplied to the treatment layer 11 from the drainage trough 50 provided above the removing means 10 and passed through the treatment layer 11, so that the removal object contained in the treatment water 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 hollow and has an outer wall 21 (an upper wall 21a, a side wall 21b, and a bottom wall 21c) that has a substantially rectangular cross section, and an inner space of the perforated block 20 connected to the inside of the outer wall 21 in a plurality of spaces. An inclined inner wall 22 that is divided into spaces is provided.
The perforated block 20 may be formed of any material as long as it is excellent in corrosion resistance and pressure resistance. For example, the perforated block 20 can be reduced in weight if formed by foam molding of high-density polyethylene. And workability is good in terms of construction.

  The upper wall 21 a directly contacts the lower surface of the removing unit 10 or indirectly supports the removing unit 10 through 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 circulation part B communicate with each other via a plurality of upper wall hole parts 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 middle flow portion 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 the bottom wall opening (not shown) formed in the bottom wall 21c of the perforated block 20, or is connected to the central circulation part A. The pipe (not shown) flows down and is transferred to a predetermined water tank.

On the upper surface of the upper wall 21a, an upper wall first rib portion 23a extending from the side wall 21b, an upper wall second rib portion 23b parallel to the upper wall first rib portion 23a, and an upper wall first rib portion 23a An upper wall third rib portion 23c that intersects perpendicularly is provided. In the present embodiment, the case where two upper wall first rib portions 23a, one upper wall second rib portion 23b, and ten upper wall third rib portions 23c are formed is shown, but the present invention is not limited thereto. It is not a thing.
By these rib portions 23a to 23c, the upper surface of the upper wall 21a is divided into a plurality of sections. By providing these rib portions 23a to 23c, the pressure resistance of the upper wall 21a can be strengthened, and the bending of the upper wall 21a due to the load of the removing means 10 can be prevented.
The perforated plate 60 is placed on the upper surfaces of the rib portions 23a to 23c. The perforated plate 60 is fixed to the rib portions 23a to 23c or the upper wall 21a by bolts. For example, the perforated plate 60 may be configured by joining a large number of pellets having a diameter of several mm. As the pellet, ceramics, sintered metal, etc. can be used in addition to plastics such as polyolefin.

  When the plurality of perforated blocks 20 are juxtaposed on the side wall 21b, the lateral side that transmits the load from above and below received by the perforated blocks 20 to the filler 30 filled between the perforated blocks 20 Ribs 24 are formed. The side ribs 24 may be horizontal side ribs 24A extending in the horizontal direction and vertical side ribs 24B extending in the vertical direction. In any rib shape, the upward load received by the perforated block 20 by the upper end surface 24a is transmitted to the filler 30, and the downward load received by the perforated block 20 by the lower end surface 24b is filled. 30. If the upper end surface 24 a and the lower end surface 24 b are configured to be substantially horizontal surfaces, the upward load and the downward load received by the perforated block 20 can be reliably transmitted to the filler 30. Furthermore, if the upper end surface 24a or the lower end surface 24b intersects the side wall 21b at an acute angle (FIG. 5), the upward load and the downward load received by the perforated block 20 are surely applied to the filler 30. It is possible to reliably prevent the perforated block 20 and the filler 30 from being displaced from each other in the vertical direction.

The perforated block 20 receives an upward load by the backwash medium and always receives a downward load due to the weight of the filtering means. When the upward load is received, the stress that the perforated block 20 tends to move upward is applied, and when the downward load is received, the stress that the perforated block 20 tends to move downward is applied. To do. In this configuration, since the side ribs 24 that transmit the load from above and below received by the perforated block 20 to the filler 30 are formed, an upward load or a downward load acts on the perforated block 20. Even so, since the side ribs 24 transmit these loads to the solidified filler 30, the relative position of the perforated block 20 with respect to the filler 30 can be fixed. Therefore, it is possible to prevent the perforated block 20 and the filler 30 from being displaced from each other in the vertical direction.
The side ribs 24 may form at least one of a horizontal side rib 24A and a vertical side rib 24B.

(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.

(Reinforcing member)
In the water collecting apparatus X of the present invention, an upper reinforcing member 41 is disposed above the middle position in the height direction of the perforated block 20 and a lower reinforcing member 42 is disposed below the middle position in the filler 30. It is.

With this configuration, even when an upward load or a downward load is applied to the perforated block 20, the upper reinforcing member exists in the upper region of the solidified filler 30, and the lower region has a lower portion. Since the reinforcing member exists, tensile stress is hardly generated in the upper region and the lower region. Therefore, it is possible to prevent the upper region or the lower region of the solidified filler 30 from being destroyed.
The upper reinforcing member 41 and the lower reinforcing member 42, which are the reinforcing members 40, can use, for example, reinforcing bars and wood, but are not limited thereto. In order to prevent the solidified filler 30 from being broken over its length, for example, any material that can be disposed horizontally in a long shape can be used.

The upper reinforcing member 41 and the lower reinforcing member 42 may be separate members or may be configured integrally. When these are integrated and configured, for example, the lower reinforcing member 42 may branch from the upper reinforcing member 41 (FIG. 4). The position where the lower reinforcing member 42 branches can be determined based on the width of the flume 70, for example.
In this embodiment, the position 43 where the lower reinforcing member 42 branches is near the end of the flume 70 in plan view, and the position where the lower reinforcing member 42 is provided corresponds to the position where the flume 70 is formed. . Since there is no member that receives the filler 30 below at the position where the flume 70 exists, the solidified filler 30 may be destroyed when tensile stress acts on the lower region of the filler 30 at that position. . If the position where the lower reinforcing member 42 is provided corresponds to the position where the flume 70 is formed, the generated tensile stress is less likely to occur when the filler 30 receives the downward load. The destruction of the material 30 can be efficiently prevented.

  The formation range of the side ribs 24 described above may be between the upper reinforcing member 41 and the lower reinforcing member 42 in the height direction.

  In this configuration, the filler 30 solidified by the upper end surface 24 a of the side rib 24 and the upper reinforcing member 41 can be sandwiched. Similarly, the solidified filler 30 can be sandwiched between the lower end surface 24 b of the side rib 24 and the lower reinforcing member 42. As a result, the degree of coupling of the perforated block 20, the filler 30, the upper reinforcing member 41 and the lower reinforcing member 42 can be further strengthened. Therefore, it is possible to reliably prevent the perforated block 20 and the filler 30 from being displaced from each other.

(Construction method of water collecting device)
As shown in FIG. 8, the water collecting apparatus X of the present invention includes a perforated block connecting step P1, a perforated block installing step P2, a reinforcing member disposing step P3, and a filling step P4.

The perforated block connecting process P1 includes side ribs 24 on the side wall 21b that collect treated water obtained by treating treated water in an empty internal space and transmit loads from above and below to the adjacent filler 30. A plurality of the perforated blocks 20 are connected in a line in the longitudinal direction.
The perforated block installation step P2 installs a row of perforated blocks connected in a row by the connection step P1 described above.
The reinforcing member disposing step P3 is adjacent to the row of the perforated blocks installed in the perforated block installing step P2, and is located above the intermediate position in the height direction of the perforated block 20 and the intermediate reinforcing member 41 A lower reinforcing member 42 is disposed below the position.
In the present embodiment, the perforated block installation step P2 and the reinforcing member disposing step P3 are alternately repeated, and the upper reinforcing member 41 and the lower portion are disposed between the perforated blocks 20 disposed in parallel. The reinforcing member 42 is disposed.
In the filling step P4, the filler 30 is filled between the perforated blocks 20 arranged in parallel.

In this construction method, since the side wall 21b of the perforated block 20 is provided with the side ribs 24 that transmit the load from above and below to the filler 30, the perforated block 20 with respect to the filler 30 solidified by the side ribs 24 is provided. The water collecting device X that can fix the relative position and prevent the perforated block 20 and the filler 30 from being displaced from each other in the vertical direction can be formed.
Furthermore, in this construction method, the filler 30 is filled with the upper reinforcing member 41 disposed above the intermediate position in the height direction of the perforated block 20 and the lower reinforcing member 42 disposed below the intermediate position. Even when an upward load or a downward load is applied to the perforated block 20, tensile stress is hardly generated in the upper region or the lower region of the solidified filler 30, and the upper side of the solidified filler 30 is It is possible to form the water collecting device X that can prevent the region or the lower region from being destroyed.

(Back washing process)
As the water to be treated is filtered by the water treatment facility Y, 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 backwash medium is removed from the central circulation portion A through the inner wall holes b1 to b3 of the inclined inner wall 22, the upper wall hole 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.

[Another embodiment]
In the embodiment described above, the side rib 24 has been described so that the upper end surface 24a and the lower end surface 24b are substantially horizontal surfaces. However, the side rib 24 is substantially parallel to the side wall 21b. You may provide the collar part 25 which formed the opposing surface 25a which faces (FIG. 6).
The flange portion 25 may be formed on any one of the upper end surface 24a and the lower end surface 24b.

  The shape of the reinforcing member 40 is not limited to the shape described above. For example, as shown in FIG. 7, the lower reinforcing member 42 may have a shape other than the above, such as being provided in parallel with the upper reinforcing member 41 without being bent.

  With this configuration, the upward load and the downward load received by the perforated block 20 by the side ribs 24 are reliably transmitted to the filler 30, so that the perforated block 20 and the filler 30 are positioned in the vertical direction. It is possible to reliably prevent the displacement, and it is possible to reliably prevent the perforated block 20 and the filler 30 from being displaced in the direction away from each other by the facing surface 25a of the flange portion 25.

  Moreover, although the example which provides the porous plate 60 between the removal means 10 and the perforated block 20 was shown in the above-mentioned embodiment, it may replace with the porous plate 60 and may provide the support gravel layer 11a.

  The present invention removes suspensions (substances to be removed) contained in water to be treated such as tap water, industrial water, industrial water, domestic wastewater, and industrial wastewater, and collects the treated water from which the suspended solids have been removed. It can utilize for the construction method of the water collecting apparatus which performs the process to perform, the porous block used with a water collecting apparatus, and a water collecting apparatus.

X water collecting device 10 removing means 11 treatment layer 12 granular medium 20 perforated block 21a upper wall 21b side wall 21c bottom wall 24 side rib 24A horizontal side rib 24B vertical side rib 25 flange 25a facing surface 30 filler 41 upper Reinforcing member 42 Lower reinforcing member P1 Perforated block installation process P2 Reinforcing member disposing process P3 Filling process P4 Laminating process

Claims (7)

Supports a removing means for passing the treatment water in a downward flow from above the treatment layer filled with the granular medium to remove the removal object contained in the treatment water by the treatment layer, and passes through the treatment layer. A perforated block for collecting the treated water from which the objects to be removed have been removed into a hollow internal space;
When juxtaposing a plurality of the perforated blocks, a filler for filling between the perforated blocks, and
A water collecting device in which a side rib for transmitting a load from above to the perforated block to the filler is formed on a side wall of the perforated block.   The water collecting apparatus according to claim 1, wherein a lower reinforcing member is disposed in the filler below an intermediate position in the height direction of the perforated block.   The water collecting apparatus according to claim 2, wherein an upper reinforcing member is disposed above the lower reinforcing member in the filler. An upper wall that supports removal means for passing the treated water in a downward flow from above the treated layer filled with the granular medium to remove the removal object contained in the treated water by the treated layer; and A side wall connected to the wall, and a bottom wall connected to the side wall,
In the perforated block for collecting the treated water from which the object to be removed has passed through the treatment layer into a hollow internal space,
A perforated block in which a side rib for transmitting a load from above received by the perforated block is formed on the side wall in a filler filled between the perforated blocks when the perforated blocks are juxtaposed. .   The perforated block according to claim 4, wherein the side rib is provided with a facing surface portion that faces and extends substantially parallel to the side wall.   The perforated block according to claim 4 or 5, wherein a lower end surface of the side rib intersects with the side wall at a perpendicular or acute angle. Collecting treated water that has been treated in a hollow internal space and installing a plurality of perforated blocks with side ribs on the side walls that transmit the load from above to the adjacent filler Hole block installation process;
A reinforcing member disposing step of disposing a lower reinforcing member below the intermediate position in the height direction of the perforated block between the perforated blocks disposed in parallel;
And a filling step of filling the filler between the perforated blocks arranged in parallel.

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