JP2001241029A - Impervious plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a partition work more easily, provide an impervious plate capable of reducing the transportation cost and material cost, and allow a removal work or modifying work for installation position of the impervious plate more easily. SOLUTION: This impervious plate 1 is installed in a sewage treatment tank or a water passage such as an overflow channel in a stilling basin, in which a cavity portion 15 of a predetermined width in up-down direction is formed internally, a water flow hole 12 for communicating the cavernous portion 15 to the outside is provided near the bottom portion of the cavernous portion 15, and an air passage hole 24 communicating the cavernous portion 15 to the outside is located near the upper end portion of the cavernous portion 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water shielding plate used as a partition for a sewage treatment tank or as an overflow weir of a water reducing pond.

[0002]

2. Description of the Related Art In recent years, there has been a demand for improvements in the functions of sewage treatment tanks such as sewage treatment plants and biological reaction tanks in order to achieve water quality and environmental standards based on Article 16 of the Basic Environment Law of the effluent from urban sewage treatment plants. I have.

As a countermeasure, for example, as shown in FIG. 13, a biological reaction tank A of an existing sewage treatment plant is replaced with an anaerobic tank a1.
By partitioning into three treatment tanks of an anoxic system tank a2 and an aerobic tank a3, the inflow water in which the sludge is settled in the sedimentation tank B is sequentially passed through the three tanks constituting the biological reaction tank A, After performing biological reactions of release, denitrification, nitrification, phosphorus intake,
Attempts to clear water quality standards by precipitating excess sludge from the effluent in the final sedimentation basin C have become concrete.

[0004] In this case, as shown in FIG. 14, the biological reaction tank A of the sewage treatment tank is usually formed in a constricted state in which the width of the upper opening is narrower than the width below the upper opening. Conventionally, when partitioning the inside of the biological reaction tank A,
The two ends of a plurality of partition plates d (water-blocking plates) having a length corresponding to each width are sequentially fixed to the L-shaped steel material attached to the above with bolts and nuts.

For this reason, it is troublesome to carry the heavy and long partition plate d into the biological reaction tank A or fix both ends of the partition plate d to the L-shaped steel material e attached to the biological reaction tank A with bolts and nuts. Yes, it is difficult to perform partition construction,
There is a problem that the partition plate d once attached is difficult to remove, and it is not easy to change the mounting position of the partition plate d.

[0006] Further, as a damping pond overflow weir provided on the downstream side of the dam or the like, a corner drop (water impervious plate) having the same structure as the partition plate d used in the sewage treatment tank may be used.
In this case as well, it is costly to transport a heavy partition plate made of a solid plate material to a mountain area where a dam is provided, and the installation work is also complicated, which is difficult to construct.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a water shield plate which can facilitate partitioning work and reduce transportation costs and material costs. The purpose of the present invention is to make it easy to remove the water plate and change the mounting position.

[0008]

According to the present invention, the following technical means are provided to achieve the above object.

That is, the present invention relates to a water shielding plate provided between left and right side walls of a water channel for partitioning the water channel, wherein:
It is characterized in that a cavity into which water in the water channel flows is provided. In the present invention, the impermeable plate may be fixed to the left and right side walls with fasteners such as bolts and nuts. It is good to constitute as a corner drop which is dropped. Further, the water channel may be of any structure and application, for example, a sewage treatment tank for internally treating sewage such as the above-mentioned sewage treatment tank, other water treatment tanks, agricultural waterways, industrial waterways. , Rivers and the like are also included in the waterway of the present invention.

According to the above-mentioned water shield plate of the present invention, since the hollow portion is provided inside, the water shield plate can be reduced in weight, the work can be easily performed, and the transport can be easily performed. Water flows into the cavity when it is installed between the left and right side walls of the waterway, so it can easily sink into deep water, and the water shield plate rises due to buoyancy after construction, while reducing the weight before construction. There is no. Therefore, the water shield plate can be used as a corner drop, and it is possible to configure a water shield wall of a desired height by stacking a plurality of water shield plates (square drop) vertically on a simple operation. . Further, even when a fastener for fixing the water impervious plate to the side wall of the waterway is attached, a large buoyancy does not occur, so that the structure of the fastener can be simplified. In addition, when using the water blocking plate as a corner drop, it is preferable to provide a locking portion for preventing positional deviation at a position where the water blocking plate is stacked vertically, and according to this, by the engagement of the locking portion, The water shield plates can be stacked without gaps without causing displacement of the upper and lower ends.

According to the present invention, there is further provided a water shield plate provided between left and right side walls of a water channel for partitioning the water channel, wherein a hollow portion having a predetermined width in a vertical direction is formed inside, and the hollow portion communicates with the outside. A water hole is provided near the lower end of the cavity, and a vent that communicates the cavity with the outside is provided near the upper end of the cavity. According to this, in addition to the above-mentioned effects, it is possible to smoothly enter water into the hollow portion at the time of construction and to smoothly drain water from the hollow portion at the time of removal. That is, when constructed in a waterway, water is smoothly guided into the cavity from the water passage hole near the lower end, and the air in the cavity smoothly flows out from the ventilation hole near the upper end. Further, when the water is removed from the water channel, the water in the cavity smoothly flows out of the water hole near the lower end, and the outside air smoothly flows into the cavity from the air hole near the upper end. The cavity is preferably configured to communicate from near the upper end to near the lower end of the impermeable plate, but it can be provided only on the upper side of the impermeable plate or only on the lower side. is there. In addition, it is sufficient that at least one cavity portion provided with a water passage hole is provided, and a closed cavity portion without a water passage hole may exist.

In the above-described present invention, the hollow portion is
A plurality of corners may be formed in the left-right width direction. In this case, it is preferable to provide a drain hole and an air drain hole for each cavity. In addition, a communication hole for communicating each cavity may be provided, or each cavity may be formed completely independently.

Further, the water barrier plate of the present invention can be formed by attaching plate members to front and rear surfaces of a beam-assembled panel structure. In this case, each of the vertical beams and the horizontal beams constituting the beam-assembled panel structure and the space surrounded by the front and rear plate members constitute the hollow portion. In such a water shielding plate, a water passage hole and a ventilation hole can be provided in one or both of the front and rear plate members. For example, a water hole and a ventilation hole may be provided only on the plate material on the downstream side of the waterway, or a water hole and a ventilation hole may be provided only on the plate material on the upstream side of the waterway, and the upstream and downstream sides may be provided. Water holes and air holes may be respectively provided in both plate members on the side. In addition, it is also possible to form the above-mentioned water hole and air hole in the beam-assembled panel structure.

The above-mentioned water shield plate can be used as a partition for a sewage treatment tank having a horizontally-long, constricted upper opening. Such a partition structure is a partition structure for a sewage treatment tank in which a horizontally long narrowed sewage treatment tank having a constricted upper opening is a sewage treatment tank partitioned into a plurality of treatment tanks. A pair of receiving frame members opposing each other in a direction perpendicular to the horizontal direction are vertically provided along a wall surface of the portion, and a concave groove is provided along a vertical direction on an opposing surface of the receiving frame member, and the pair of receiving frame members is provided. A plurality of water-blocking plates (partition plates) are sequentially dropped and stacked along the concave grooves between the frame members so as to slide on both ends thereof, and between the receiving frame member and the inner surface of the sewage treatment tank. A partition plate is mounted. This sewage treatment tank is an embodiment of the above-mentioned water channel in the present invention.

[0015] In the partition structure for a sewage treatment tank, a pair of receiving frame members are vertically installed in the sewage treatment tank along a wall surface of an upper opening and opposed in a direction perpendicular to the horizontal direction.
A concave groove is provided on the opposing surface of the receiving frame material along the up-down direction, and a plurality of water-impervious plates slide along both end edges along the concave groove between the pair of receiving frame materials. While being dropped and stacked, a partition plate is attached between the receiving frame member and the inner surface of the sewage treatment tank, so that a pair of first and second sewage treatment tanks having a horizontally long narrowed upper opening are provided. The main work of partitioning can be performed by a simple work of hanging the receiving frame material and stacking it so that multiple water barrier plates are dropped between the pair of receiving frame materials, and the effect of the partitioning effect Confirmation is easy, and the mounting position of the impermeable plate can be easily changed.

Further, in the partition structure, a plate member having a vent hole is attached to the front and rear surfaces of the beam-assembled panel structure, and a locking portion for preventing displacement is provided at a position where the water blocking plate is vertically stacked. Can be used. According to this, the water impervious plate is attached to the front and rear surfaces of the beam-assembled panel structure with a plate material having a water passage hole,
If there is a locking part for preventing misalignment at the position where it is stacked vertically, the water shield plate can be reduced in weight and work is easy, and water enters through the water passage hole, so that the water shield plate may rise. In addition, the partition plates can be stacked without gaps without causing displacement of the upper and lower ends by the engagement of the locking portions.

Further, in the above partition structure, the water-impervious plate is formed by attaching plate members to front and rear surfaces of a beam-assembled panel structure, and providing a locking portion for preventing misalignment at a vertically stacked position. The beam-assembled panel structure may have a space communicating with both ends. According to this, the water shield plate can be reduced in weight and the work is easy, and since the water enters into the space communicating with both ends, the water shield plate does not rise, and the water blocking by the engagement of the locking portion is achieved. The plates can be stacked without gaps without causing displacement of the upper and lower ends.

Further, in the partition structure, the water impervious plate is formed by attaching plate members to front and rear surfaces of a beam-assembled panel structure, and providing a locking portion for preventing misalignment at a vertically stacked position. The beam-assembled panel structure may have a space communicating with upper and lower ends. According to this, the water shield plate can be reduced in weight and work is easy, and since water enters into the space communicating with the upper and lower ends, the water shield plate does not rise, and the engagement of the locking portion allows the water shield plate to be engaged. The water plates can be stacked without gaps without causing displacement of the upper and lower ends.

As the water shield plate and the shield plate, a fiber reinforced plastic foam is suitably used from the viewpoint of corrosion resistance, durability, workability, economy and the like, and particularly, a long glass fiber reinforced urethane foam is used. Most preferably used.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a partition structure of a sewage treatment tank (water channel) using a water shield plate 1 according to a first embodiment of the present invention as a partition plate between respective treatment tanks of a biological treatment tank. This sewage treatment tank has a horizontally long shape having an upper opening 2 (FIG. 13).
(Similar to the biological reaction tank A in the figure). The width W1 of the upper opening 2 is narrower than the width W2 of the intermediate portion below the upper opening 2, so that the upper opening 2 has a constricted shape.

In the sewage treatment tank, a pair of left and right receiving frame members 3 are vertically provided along the wall surface of the upper opening 2 and opposed in a direction perpendicular to the horizontal direction. The pair of receiving frame members 3 are fixed to the inner surface of the upper opening 2 with anchor bolts or the like.

The receiving frame member 3 is provided with a concave groove 4 on the opposite surface along the vertical direction. A concave groove 5 is also provided on the side surface of the receiving frame member 3 opposite to the opposite surface along the vertical direction. That is, the receiving frame member 3 is made of H-shaped steel, and its concave groove is used as a receiving frame.

Between the pair of receiving frame members 3, a plurality of water-impervious plates 1 are formed along concave grooves 4 provided on opposite surfaces thereof.
(Partition plates) are sequentially dropped on both end edges thereof and stacked vertically. In addition, receiving frame material 3,
A plurality of partition plates 6 are successively dropped along one end edge thereof along the concave grooves 5, 5 provided on the surface opposite to the opposing surface 3 and are stacked vertically, and the other side edge is provided. Are fixed to the L-shaped steel member 7 attached to the inner surface of the sewage treatment tank with bolts and nuts.

As shown in FIG. 2, the water shield plate 1 is a plate member 1 having water passage holes 12 on the front and rear surfaces of a beam-assembled panel structure 11.
3 are attached to each other, and cavities 14 and 15 are formed by a space surrounded by each beam constituting the beam-assembled panel structure 11 and the plate 13. More specifically, the beam-assembled panel structure 11 is vertically
A grid-like panel structure formed by assembling a row of horizontal beams 11a and a large number of vertical beams 11b in the left-right direction. Many cavities 14 and 15 are formed in the left-right direction. A plurality of the water passage holes 12 are provided corresponding to the respective lower cavity portions 15 and communicate the lower cavity portions 15 with the outside. In the present embodiment, the cavity 14 on the upper side has a closed structure.

The water shield plate 1 is provided with locking portions 16 and 17 for preventing displacement thereof at positions vertically overlapping each other. When the plurality of water shields 1 are stacked, the lower end lock 17 of the upper water shield 1 and the upper stopper 1 of the lower water shield 1 are stacked.
6 are engaged with each other, so that the water shield plates 1 can be stacked without any displacement of the upper and lower ends.

The water-blocking plate 1 is formed by using the beam-assembled panel structure 11 as a core material, so that a large number of rectangular cavities 14,
15, it is possible to obtain constant strength while being lightweight, and the plate member 13 has the water passage hole 12, so that the plate material 13 can be inserted into the lower cavity portion 15 from the ventilation hole 12. Since water enters, the water shield plate 1 is prevented from rising. In the water shield plate 1 of the first embodiment, the hollow portion 1 is provided in the plate 13 or the panel structure 11.
It is preferable to form a ventilation hole located in the vicinity of the upper end of 5, and according to this, it is possible to achieve smooth and reliable flow of water into cavity 15.

FIG. 3 shows a water shield plate 1 according to a second embodiment of the present invention. The difference from the first embodiment is that a communication hole 18 communicating between the lower cavity portions 15 is provided. It is provided on the vertical beam 11b, and the other structures are the same.

In the water impermeable plate 1 according to the second embodiment, a space is formed inside the beam-assembled panel structure 11 at both ends in the left-right width direction. It is not necessary to provide the water passage holes 12 and the water shield plate 1 made of a beam-assembled panel structure while reducing the number of the water passage holes 12
Can be prevented from rising.

FIG. 4 shows a water shield plate 1 according to a third embodiment of the present invention. The difference from the first embodiment is that a communication hole 19 communicating the upper and lower cavities 14, 15 is provided.
This is a point formed in the cross beam 11a located between these hollow portions 14 and 15, and the other structure is the same.

According to the water shield plate 1 according to the third embodiment, the upper cavity 14 is also communicated with the outside via the communication holes 19, the lower cavity 15, and the water holes 12. Therefore, it is possible to provide a structure in which water enters the hollow portion 14, and it is possible to improve the certainty of preventing the floating. In this case, it is preferable to provide the ventilation hole near the upper end of the water shield plate 1.

As shown in FIG. 5, the partition plate 6 is provided with plate members 62 adhered to the front and rear surfaces of a beam-assembled panel structure 61. , 64 are provided. In the case of the partition plate 6, the other side edge is fixed to the L-shaped steel member 7 attached to the inner surface of the sewage treatment tank 1 with bolts and nuts. The water hole 12 and the communication hole 1
The lifting prevention means such as 8, 19 is not particularly required, but may be provided similarly.

FIG. 6 shows a case where a water barrier plate 1 according to a fourth embodiment of the present invention is used as upper and middle corner droppers.
FIG. 13 is a simplified front view of a damping pond overflow weir 20 using a water impervious plate 1 ′ according to a fifth embodiment of the present invention as the lowermost corner drop.

The weir 20 is constructed by sequentially dropping a plurality of water shield plates 1 and 1 ′ into a receiving frame 21 formed of a vertically extending concave groove provided on the right and left side walls W of the overflow channel.

As shown in FIG. 7, the receiving frame 21 is formed by fixing a vertically long Z-section steel member 22 to the end surface of the side wall W with an anchor bolt or the like. A concave groove 23 is formed between the side wall W.
The left and right grooves 23 are open to face each other, and the water blocking plates 1 and 1 ′ can be dropped into the left and right grooves 23 from above. In addition, as another example, L-shaped steel may be used as the steel material, and two steel plates may be used on the inner surface of the water channel to form a receiving frame, and a water impermeable plate may be installed there.

As shown in FIGS. 8 to 10 and FIGS. 11 and 12, each of the water-impervious plates 1 and 1 'is formed by attaching plate members 13 to the front and rear surfaces of a beam-assembled panel structure 11. ing. The beam-assembled panel structure 11 includes a plurality of cross beams 1.
1a and a plurality of vertical beams 11b are assembled. In the present embodiment, two horizontal beams 11a located at the upper end and the lower end, and six columns of vertical beams 11b arranged in the left-right direction.
And Note that the vertical beams 1 located at the left and right ends
1b has a larger cross-sectional shape than other vertical beams. The water shield plates 1 and 1 ′ are formed by the space surrounded by the horizontal beams 11 a, the vertical beams 11 b, and the front and rear plate members 13.
A large hollow portion 15 extending from near the upper end to near the lower end is formed.

As shown in FIGS. 11 and 12, in the lowermost water shield plate 1 ′, an opening 25 penetrating in the front-rear direction is formed at a lower central position of the front and rear plate members 13. A beam member 11 c surrounding the opening 25 is added to the panel structure 11. The opening 25 serves as a water passage for surely aeration in each section when the water path is divided into a plurality of sections and aeration (aeration) is performed for each section, for example. By providing the opening 25, a short path of water in the water channel is eliminated, and uniform processing can be performed.

The front and rear plate members 13 are provided with a plurality of ventilation holes 24 near the upper end thereof for communicating the respective cavity portions 15 with the outside at positions corresponding to the respective cavity portions 15.
In the vicinity of the lower end, a plurality of water holes 12 for communicating each cavity 15 with the outside are provided at positions corresponding to each cavity 15.

The left and right ends of the surface of the plate 13 are provided with seal packings 26 extending over the entire length in the vertical direction so as to ensure watertightness when dropped into the receiving frame 21. Further, a handle 27 is fixed to each of the water-impervious plates 1, 1 'at two places on the left and right.
1 'can be easily handled. The handle 27 secures the mounting strength by being fixed to a buried tree 28 buried between the front and rear plate members 13.

In each of the water shielding plates 1 and 1 ', the upper surface of the upper cross beam 11a is projected slightly above the upper ends of the front and rear plate members 13. Is configured. Further, in the upper and middle water-impervious plates 1, the lower surface of the lower cross beam 11b is moved to the front and rear plate members 1b.
3 by being buried slightly above the lower end of
A groove is formed in the lower end surface of the lower end portion.
7 are configured. A lower end locking portion is not formed on the lowermost water shielding plate 1 ', and a seal packing is provided on the lower end surface of the water shielding plate 1' over the entire length in the left-right direction in order to improve the sealing performance at the lowermost end. 29 is pasted.

In each of the water shield plates 1 and 1 ', a communication hole for connecting the cavities 15 may be provided in the panel structure 11, or the communication hole may not be provided. In the illustrated example, the upper and middle water shield plates 1 are not provided with communication holes, and each cavity 15 is formed completely independently. In the lowermost impermeable plate 1 ′, a plurality of communication holes 30 are formed at appropriate positions of the panel structure 11, communicating between the cavities 15 and communicating the cavities 15 with the openings 25. According to this, the water shield plate 1 '
When the water is removed from the water channel, the water in the cavity 15 flows out smoothly to the outside, so that the removal operation can be speeded up.

According to the above-described damping pond overflow weir 20, a hollow portion 15 is formed in the inside over substantially the entire length in the vertical direction, and a water passage hole 12 communicating the hollow portion 15 with the outside is formed at the lower end of the hollow portion 15. A plurality of water-impervious plates 1, 1 ′ provided near the upper portion and provided near the upper end of the hollow portion 15 and communicating with the outside of the hollow portion 15 are sequentially dropped into the receiving frame 21. Has the following advantages.

That is, since each of the water shielding plates 1 and 1 ′ is made of the beam-assembled panel structure 11 as a core material, it is possible to obtain a desired strength while being extremely lightweight. The construction work can be facilitated, and after the construction in the water channel, the water smoothly flows into the hollow portion 15 from the water passage hole 12 and the floating is prevented. Furthermore, when removing the seepage control board installed in the waterway,
The outside air smoothly flows into the cavity 15 from the ventilation hole 24,
The water in the hollow portion 15 flows out smoothly from the water hole 12 to speed up the removal operation, and is lightweight after the removal, so that the subsequent handling can be facilitated.

The present invention is not limited to the above embodiment, and the design can be changed as appropriate. For example, in the above embodiment, the beam-assembled panel structure was used as the core material, but a frame-shaped structure integrally formed from a molding material such as a resin foam was used as the core material, and plate materials were provided on the front and rear surfaces thereof. It is also possible to constitute a water shield plate by sticking. Further, the ventilation hole and the water passage hole can be provided at appropriate positions such as the upper end, the lower end, and the left and right ends of the core material.

It is preferable to use a glass fiber reinforced plastic foam (so-called synthetic wood) as a constituent material of the water shield plate such as the above-mentioned plate material or panel structure. As the kind of the foaming resin in the foam, for example, a hard thermosetting resin such as a urethane resin, an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, and a phenol resin is preferably used. In order to improve the compression strength and reduce the cost in the foamed resin, inorganic fillers such as calcium carbonate, gypsum, talc, aluminum hydroxide, and clay, shirasu balloon, pearlite,
A lightweight aggregate such as a glass balloon may be added.

The fiber for reinforcing the foam may be any of inorganic fibers such as glass fiber, carbon fiber and metal fiber, and organic fibers such as natural fiber and synthetic fiber. Glass fiber is suitable in terms of properties. Examples of the glass fiber include a glass roving, a glass roving cloth, a glass mat, and a continuous strand mat. This fiber may be used alone, or two or more layers may be laminated,
Also, long fibers and short fibers may be mixed and used. In addition,
Glass long fibers were aligned in the longitudinal direction to form reinforcing fibers,
Glass long fiber reinforced hard urethane foam (for example, manufactured by Sekisui Chemical Co., Ltd., trade name "Eslon Neo Lumber FF
U ”) is most preferable in terms of weight reduction, durability and workability.

Incidentally, the adhesive for bonding the synthetic woods can be appropriately selected according to the material such as the long fiber and the thermosetting resin foam constituting the synthetic sleeper. For example, when the synthetic sleeper is composed of long glass fibers and a hard urethane resin foam, an epoxy resin can be suitably used as the adhesive.

[0048]

According to the present invention, it is possible to easily perform the work of partitioning the sewage treatment tank and the work of constructing the overflow dam of the energy-reducing pond, and to easily confirm the partition effect.
In addition, it is possible to easily change the mounting position of the impermeable board and remove the work.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating an example of a partition structure of a sewage treatment tank. FIG. 1 (a) is a front view thereof, and FIG. 1 (b) is a cross-sectional view taken along line AA in FIG.

FIGS. 2A and 2B are explanatory views showing a water blocking plate according to a first embodiment of the present invention used in the partition structure, wherein FIG. 2A is a front view thereof, and FIG. 2B is a sectional view taken along line CC in FIG. Longitudinal section along the
(C) is a longitudinal sectional view along line DD in (a).

FIG. 3 is a cross-sectional view illustrating a water shield plate according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a water shield plate according to a third embodiment of the present invention.

FIG. 5 is an explanatory view showing an example of a shielding plate used for a partition structure of a sewage treatment tank, (a) is a front view thereof,
(B) is a cross-sectional view thereof.

FIG. 6 is a front view showing an example of a damping pond overflow weir.

FIG. 7 is an enlarged plan view of a receiving frame portion of the weir.

FIG. 8 is a front view showing a water blocking plate according to a fourth embodiment of the present invention used in the upper and middle stages of the weir.

FIG. 9 is a transverse sectional view taken along line EE of FIG. 8;

FIG. 10 is a longitudinal sectional view taken along line FF of FIG. 8;

FIG. 11 is a front view showing a water blocking plate according to a fifth embodiment of the present invention used in a lower stage of the weir.

FIG. 12 is a vertical sectional view taken along line GG of FIG. 11;

FIG. 13 is an overall configuration block diagram of a sewage treatment plant.

FIG. 14 is a longitudinal sectional view illustrating a conventional partition structure of a sewage treatment tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Waterproof plate 11 Beam-panel structure 12 Water passage hole 13 Plate material 14, 15 Cavity part 24 Vent hole

Claims (4)

[Claims] 1. A water shield plate provided in a water channel for partitioning the water channel, wherein a hollow portion into which water in the water channel flows is provided therein. 2. A water shielding plate provided in a water channel for partitioning the water channel, wherein a hollow portion having a predetermined width in a vertical direction is formed inside, and a water passage hole communicating the hollow portion with the outside is formed in the hollow portion. A water shield plate provided near the lower end and having a ventilation hole communicating the cavity with the outside near the upper end of the cavity. 3. A plurality of cavities are formed in the width direction of the water shield plate, and a water passage hole and a ventilation hole are provided for each cavity. The impermeable board according to the above. 4. The water-impervious plate according to claim 2, wherein plate members are attached to front and rear surfaces of the beam-assembled panel structure.
A water blocking plate, wherein a water passage hole and a ventilation hole are provided in one or both of the front and rear plate members.