JP5965285B2 - Water treatment facility cover - Google Patents

Description

  The present invention relates to a cover installed in a water treatment facility such as a water purification facility or a sewage treatment facility.

  Conventionally, a water treatment facility has been provided with a cover on a water channel or a water tank depending on the purpose or use of the facility. For example, a cover of a water tank or the like (filter pond or the like) in a water purification facility is installed mainly for the purpose of preventing the generation of algae in the water tank or preventing the arrival of bird droppings or garbage. Moreover, the cover of a water tank or the like (such as a sand basin) in a sewage treatment facility is installed mainly for the purpose of deodorizing or preventing falling into the water tank.

  By the way, this kind of cover is used when checking the internal state of the water tank (filtered state and sedimentation state), when performing maintenance and inspection inside the water tank, or when a general visitor observes the water treatment facility. It is necessary to move and open the water tank etc. In particular, when the visitor visits the facility, the target tank is only temporarily opened, so that the cover can be easily opened and closed. Therefore, in recent years, this type of cover has shifted from a concrete one to a resin one in order to improve the workability of this type of work. In other words, recent cover covers have been reduced in weight by adopting a resin molded body, and the burden on the operator has been reduced.

  In recent years, the size of facilities such as water purification facilities and sewage treatment facilities has been increasing, and accordingly, the cover itself has a tendency to be increased in size (at least one side is 6 m or longer). . On the other hand, there is a concern that the resin cover is likely to be affected by the weight of the cover and a creep phenomenon (for example, a load such as snow over a long period of time) due to an increase in size. That is, when this type of cover is employed in a large-sized water tank or the like, the top plate may be greatly bent due to its own weight or the like, and there is a risk of forming a depression recessed downward near the center of the top plate. Furthermore, when it rains or wind blows in such a state, there has been a concern that earth and sand and dust accumulate in the depressions formed on the top plate, which impairs the beauty.

For this reason, this type of cover has a general structure in which a beam is provided on the back surface of the top plate and reinforcement is provided to resist bending of the top plate. For example, this technique is disclosed in Patent Document 1.
However, even if a large resin cover is simply reinforced with a beam, the progress of the bending over time in the top plate cannot be sufficiently prevented, and it has not become a fundamental solution.

Therefore, in recent markets, the above-mentioned beam reinforcement is applied and a cover having a top plate arranged in an arch shape or a mountain shape is provided. This type of cover is less affected by bending than a beam reinforcement alone, and can effectively suppress problems caused by an increase in size. In particular, a cover with a top plate arranged in a mountain shape can be produced by combining linearly shaped members. Therefore, compared to the arch type, in addition to the above effects, the production efficiency is high and relatively inexpensive. It also has the advantage that it can be provided.
For example, Patent Document 2 discloses a cover provided with such a mountain-shaped top plate.

JP 2001-140331 A JP 2008-24340 A

  However, because the conventional mountain-shaped cover covers structurally, a component force acting in the horizontal direction due to gravity (hereinafter referred to as a horizontal component force) acts on the outside, so it is simply placed on the top of a water tank or the like. I couldn't. That is, when this type of cover is employed, it is necessary to provide a fixing member (for example, a metal member having a cross-sectional shape “L” shape) having strength sufficient to withstand the horizontal component of the cover in the installation portion. Since it was necessary to securely fix the cover to the fixing member, considerable effort was required to install the cover.

  Then, in view of the problem of a prior art, this invention makes it a subject to provide the cover for water treatment facilities which does not generate | occur | produce the installation effort, although the generation | occurrence | production of the malfunction of the external appearance resulting from a bending can be prevented.

The invention according to claim 1, which is provided to solve the above problem, is a cover for a water treatment facility in which a top plate supported by a beam covers a part or all of an opening formed in an upper part of a water tank or a water channel. The beam has at least two sets of main beam portions, and the main beam portion has a first main beam extending in a substantially horizontal direction and a second main beam inclined in a mountain shape upward. The second main beam is supported by the first main beam. Further, the second main beam has at least a part above the first main beam in order to fix the top plate. The first main beam is fixed to the side surface in the longitudinal direction of the first main beam, and the second main beam has a structure in which the ends of two straight plate-shaped members are abutted, and at least the plate It is a cover for water treatment facilities characterized in that the upper side of the shaped member has a mountain shape .
The present invention is a cover for a water treatment facility in which a top plate supported by a beam covers part or all of an opening formed in an upper part of a water tank or a water channel, wherein the beam has a main beam portion, The beam portion has a first main beam extending in a substantially horizontal direction and a second main beam inclined in a mountain shape upward, and the second main beam is supported by the first main beam. Further, the second main beam is arranged on the side surface in the longitudinal direction of the first main beam with at least a part of the upper portion exposed above the first main beam in order to fix the top plate. Related to fixed water treatment facility covers.

  The cover for a water treatment facility of the present invention has a configuration in which a first main beam extending in a substantially horizontal direction is supported by a second main beam inclined in a mountain shape, and a top plate is fixed to the second main beam. All of the horizontal component force (horizontal component force) that acts due to the weight of the second main beam and the top plate can be applied to the first main beam. That is, the cover for a water treatment facility of the present invention has a configuration in which a horizontal component force is not applied to the outside, and thus can be regarded as a structure similar to a simple beam structure formed by only the first main beam. And in this invention, although it is a simple beam structure, the inclined part formed with the 2nd main beam is securable. For this reason, according to the present invention, even if the top plate is bent, it is possible to remove the sediment that can be deposited along the inclination of the second main beam, and thus the appearance is impaired by the sediment. There is nothing. Furthermore, in the present invention, unlike the conventional mountain-shaped cover, there is no need to consider the horizontal component force at the time of installation.

  Thus, the invention described in claim 1 is characterized in that a simple beam structure is provided while a mountain-shaped inclined portion is provided on the upper portion. And in order to make it such a structure, in this invention, the main beam part is formed using the 1st main beam and the 2nd main beam. For example, a linear plate-like member can be used for the first main beam and the second main beam, and thereby the main beam portion can be formed. However, simply thinking, it seems that it is more rational to produce the pentagon like a home base by integrating the first main beam and the second main beam into a pentagon. However, in an actual production site, a plate body of a predetermined standard (for example, a rectangular plate body having a constant member thickness) is used, and production is performed by cutting the plate body into a desired size. If it is cut into a polygonal shape such as a pentagon, the remaining space of the plate becomes a distorted shape, and the yield may be remarkably deteriorated. Therefore, in the present invention, when the main beam portion is produced using the plate body of the predetermined standard, the first main beam and the second main beam which are separately cut can be used in combination. Thus, the production yield can be increased as compared with the case of using the main beam cut into a polygonal shape.

  In the present invention, the second main beam is fixed to the side surface in the longitudinal direction of the first main beam in a state where at least a part of the upper portion is exposed above the first main beam. It is possible to form a main beam portion having a simple structure. That is, based on the installation state of the cover for the water treatment facility, the total height of the first main beam and the second main beam (total width of the members) should be increased exclusively for the locations where the influence of the deflection becomes large. Can do. That is, in the present invention, it is possible to increase the section modulus (generally proportional to the square of the height if the section is rectangular) at a point where the influence of the deflection becomes large. As a result, in the present invention, as compared with the conventional case where the main beam portion is configured by adopting a member having substantially no change in the height component (member width) in order to make the section modulus uniform, The amount of members required for the part can be greatly reduced. That is, according to the present invention, it is possible to provide a cover for a water treatment facility having an economical and rational structure.

The invention according to claim 1 is characterized in that the second main beam has a structure in which the end portions of two linear plate members are butted, and at least the upper side of the plate member has a mountain shape. It shall be the.

  According to such a configuration, the second main beam is not formed by a member formed in a mountain shape in advance, but a mountain-shaped second main beam is formed by combining linear plate-like members. The angle can be changed to an angle corresponding to the purpose without preparing a plurality of molds.

The invention according to claim 2 is characterized in that the first main beam and the second main beam are in contact with each other and are surface-bonded by an adhesive, and the cover for water treatment facility according to claim 1 It is.

  According to such a configuration, since the first main beam and the second main beam are surface-bonded with the adhesive in a state where the side surfaces are in contact with each other, the bonding is higher than the case where they are simply bonded in a spot manner with pins, bolts, or the like. Strength can be exhibited.

By the way, the force of the compression direction (butting direction) acts on the joint of the plate-shaped member butted against the mountain shape by the gravity acting on the plate-shaped member. That is, in the second main beam in this state, there is almost no possibility that the plate-like members are separated from each other unless other external force is applied. However, when performing a maintenance check or the like, the possibility that a force (shearing force) in the direction along the joint is applied to the joint between the plate-like members cannot be denied.
Accordingly, in the invention according to claim 3 provided to cope with such a possibility, a seam reinforcing material for reinforcing a seam between two plate-like members is connected to the abutting portion of the second main beam. It is the cover for water treatment facilities of Claim 1 or 2 characterized by the above-mentioned.

  According to such a configuration, the seam between the two plate-like members forming the second main beam is reinforced with the seam reinforcing material that is a separate member, so that the strength (shear strength) in the direction along the seam at the seam is increased. Can do. Further, the seam reinforcement can also function as a means for suppressing a problem that the two plate-like members move in the separating direction.

The invention according to claim 4 is provided with two sets of main beam portions in which the second main beam is fixed to the first main beam, and in a state where the side surfaces in the longitudinal direction of the two sets of main beams are opposed to each other. apart and are formed by, on the interval, according to any one of claims 1 to 3, characterized in that the joists extending in a direction intersecting the longitudinal direction of the main beam portion is provided It is a cover for a water treatment facility.

According to such a configuration, between two pairs of the main beam portion, due to the provision of joists extending in the transverse direction to the longitudinal direction of the main beam portion, suppress the raw Ji obtained Runejire force to the main beam portion can do. Along with this, it is possible to reduce the influence of the force in the torsional direction that can occur on the top plate fixed to the second main beam. Therefore, according to the present invention, there is no possibility that the force in the twisting direction is excessively applied to the main beam portion or the top plate.

Here, assuming a case where a linear plate member is used for the first main beam and the second main beam and the mountain-shaped second main beam is fixed to the longitudinal side surface of the first main beam, Based on the state in which the cover for the water treatment facility is installed, the second main beam is arranged mainly on the upper side of the first main beam. That is, when the main beam portion is formed based on the above conditions, there is almost no region where the second main beam overlaps on the lower side of the first main beam. As a result, the strength against the force in the twisting direction is weaker on the lower side of the first main beam than on the upper side.
Therefore, according to defect eliminating invention of claim 5 is provided, claim 1-4, characterized in that fixing the reinforcing beam to the lower side of the longitudinal side of the first main beam It is a cover for water treatment facilities as described in above.

  According to such a configuration, since the reinforcing beam is fixed near the lower part of the longitudinal side surface of the first main beam, the strength of the first main beam against the force in the torsional direction can be increased.

  The cover for the water treatment facility of the present invention has a simple beam structure, but an inclined portion is secured at the top thereof, so there is no need to consider horizontal component force, and there is almost no installation effort. Sediment and the like do not accumulate on the top plate and damage the appearance. Further, since the main beam portion is formed by combining the first main beam and the second main beam that are separately produced, the production yield can be improved.

It is a perspective view which shows the state which installed the cover for water treatment facilities which concerns on embodiment of this invention in the upper part of the water tank. It is a perspective view which shows the cover for water treatment facilities of FIG. It is a disassembled perspective view which shows the cover for water treatment facilities of FIG. It is a front view which shows the state which installed the cover for water treatment facilities which concerns on embodiment of this invention in the upper part of the water tank. It is a side view which shows a 2nd main beam formation body. It is a perspective view which shows the positional relationship of two main beam parts. It is a perspective view which shows the positional relationship of a 1st main beam and a 1st small beam. (The top plate and secondary beam are omitted.) It is a perspective view which shows the positional relationship of a 2nd main beam and a 2nd small beam. (The top plate and secondary beam are omitted.) It is a perspective view which shows the positional relationship of a main beam part and a reinforcement beam part. (The top plate and secondary beam are omitted.) It is explanatory drawing which shows the positional relationship of a main beam part, a small beam part, and a reinforcement beam part.

Below, the cover for water treatment facilities which concerns on embodiment of this invention is demonstrated.
The cover 1 for water treatment facilities of this embodiment is used for water treatment facilities, such as a water purification plant and a sewage plant, and as shown in FIG. 1, the water tank 30 (such as a sedimentation basin provided in those facilities) 4) is installed so as to cover the upper side of the opening 31 (FIG. 4). In more detail, the cover 1 for water treatment facilities of this embodiment arranges the cover 1 with the same structure with respect to one water tank 30, and makes the opening part 31 the obstruction | occlusion state.

  As shown in FIGS. 2 and 3, the water treatment facility cover 1 has a mountain shape and includes a top plate 2 and a beam member 3 as main components.

  The top plate 2 is a portion that closes the opening 31 of the water tank 30 in a posture mainly facing the water tank 30, and has a rectangular shape in plan view. And in this embodiment, what was shape | molded for this top plate 2 using the polyurethane foamed resin (FFU: Fiber reinforced foamed urethane) reinforced with the glass-made long fiber is employ | adopted. Here, “FFU” refers to a polyurethane foamed resin formed by laminating a laminated plate, which is a thin fiber reinforced resin foam, until a predetermined thickness is reached.

The top plate 2 is aligned so that the orientation of the long fibers is directed in the longitudinal direction of the top plate 2. That is, the top plate 2 has a structure in which the rigidity with respect to the bending moment of the force acting in the direction intersecting with the longitudinal direction, that is, the rigidity with respect to the bending is reinforced. Further, the FFU top plate 2 is sufficiently lighter in weight than a metal or concrete cover, etc., and further has a property of high corrosion resistance.
In the present embodiment, two top plates 2 are used for one water treatment facility cover 1.

  The beam member 3 is a member that bears the skeleton of the water treatment facility cover 1, and includes a main beam portion 5, a sub-beam portion 7, a small beam portion 10, and a reinforcing beam portion 11. In addition, the beam member 3 is comprised by above-mentioned FFU, and the orientation of the long fiber is arrange | equalized with the longitudinal direction of each member also in any beam part 5, 7, 10, 11.

  The main beam portion 5 is a member that mainly functions as a support for the top plate 2, and includes a first main beam 12 that serves as a base, and a second main beam 13 to which the top plate 2 is directly fixed. Have

The first main beam 12 is composed of a long first main beam forming body (plate-like member) 20 that extends linearly, and has a total length in the longitudinal direction (hereinafter simply referred to as a total length). 4, one side of the opening 31 of the water tank 30 (one side of the opening extending in the same direction as the water treatment facility cover 1) based on the state where the water treatment facility cover 1 shown in FIG. 4 is installed in the upper part of the water tank 30. Designed to be slightly longer than. That is, the first main beam 12 has such a length that a certain range on both ends in the longitudinal direction deviates from the opening 31 of the water tank 30 in a state where the first main beam 12 is installed in the upper part of the water tank 30.
In the present embodiment, two first main beams 12 are used for one water treatment facility cover 1.

  As shown in FIG. 3, the second main beam 13 has two elongated second main beam forming bodies (plate-like members) 21 and 22 extending linearly, and the second main beam forming body. 21 and 22 are formed by abutting one end in the longitudinal direction and joining them with an adhesive or the like. Since the two second main beam forming bodies 21 and 22 have the same size and shape, only one of them will be described below, and the description of the other will be omitted.

  As described above, the second main beam forming body 21 has an elongated shape extending linearly, and the total length of the longitudinal direction length (hereinafter simply referred to as the total length) is the length of the first main beam 12. It is set shorter than the total length. Specifically, the total length of the second main beam forming body 21 is approximately ½ times the total length of the first main beam 12, and more specifically, as shown in FIG. The total length in the state where the formed bodies 21 and 22 are abutted at the end portions is designed to be the same as the total length of the first main beam 12.

Further, as shown in FIG. 5, the second main beam forming body 21 has a parallelogram shape in a side view. That is, the second main beam forming body 21 of the present embodiment has a side (hereinafter, referred to as a short side) g extending in the short direction with respect to a side (hereinafter, referred to as a long side) f extending in the longitudinal direction. Slightly inclined. Specifically, the short side edge g is inclined with a constant gradient (for example, a gradient of 2 to 3 °) from a direction orthogonal to the long side edge f. As a result, as shown in FIG. 4, the second main beam forming bodies 21 and 22 exhibit a mountain-shaped posture in which the long side f is inclined with the constant gradient when the ends are brought into contact with each other. And the adhesive agent etc. are apply | coated to the butt | matching part of the edge parts, and the 2nd main beam forming bodies 21 and 22 are connected.
In the present embodiment, two sets of second main beams 13 formed by two second main beam forming bodies 21 and 22 are used for one water treatment facility cover 1.

The sub beam portion 7 connects the two main beam portions 5 a and 5 b and is constituted by a sub beam forming body 15. The sub-beam forming body 15 is a plate having a rectangular shape when viewed from the front, and the total length of the longitudinal direction length (simply referred to as the total length) is the total length of the first main beam 12 and the second main beam. Designed to be shorter. The secondary beam forming body 15 is designed so that the height thereof is the same as that of the first main beam 12 of the main beam portion 5 on the basis of the state where the water treatment facility cover 1 is installed. .
In the present embodiment, two sub beam portions 7 are used for one water treatment facility cover 1.

  Similar to the sub beam portion 7, the small beam portion 10 connects the two main beam portions 5 a and 5 b, and connects the first small beam 17 connected to the first main beam 12 and the second main beam 13. And a second beam 18 connected thereto.

The first beam 17 is constituted by a first beam forming body 25 that is an elongated long body. The first small beam forming body 25 is designed such that the entire length in the longitudinal direction (simply referred to as the total length) is substantially the same as that of the sub beam portion 7. In the present embodiment, the first beam forming body 25 has a member thickness that is thinner than that of the main beam portion 5 and the sub beam portion 7, and a width that is narrower than that of the main beam portion 5 and the sub beam portion 7. Has been.
In the present embodiment, three first beam 17 are used for one water treatment facility cover 1.

Similar to the first small beam 17, the second small beam 18 is constituted by a second small beam forming body 26 which is an elongated long body. The second small beam forming body 26 is designed so that the entire length in the longitudinal direction (simply referred to as the total length) is substantially the same as that of the sub beam portion 7. In the present embodiment, the member thickness of the second beam forming body 26 is made thinner than that of the main beam portion 5 and the sub beam portion 7, and the width thereof is narrower than that of the main beam portion 5 and the sub beam portion 7. Has been.
In the present embodiment, 13 second beam 18 are used for one water treatment facility cover 1.

The reinforcing beam portion 11 reinforces the main beam portion 5 and is constituted by a reinforcing beam forming body 16 which is an elongated long body. The reinforcing beam forming body 16 is designed such that the entire length in the longitudinal direction (simply referred to as the entire length) is substantially the same as that of the first main beam 12 of the main beam portion 5. In the present embodiment, the reinforcing beam forming body 16 has a member thickness that is thinner than that of the main beam portion 5 and the sub beam portion 7, and a width that is narrower than that of the main beam portion 5 and the sub beam portion 7. Yes.
In the present embodiment, two reinforcing beam portions 11 are used for one water treatment facility cover 1.

Then, the positional relationship of each member which comprises the cover 1 for water treatment facilities of this embodiment is demonstrated.
As shown in FIG. 2, the cover 1 for water treatment facilities of this embodiment has two top plates 2 fixed on a beam member 3 as a support. Specifically, as shown in FIG. 4, the two top plates 2 are arranged along the posture at the upper part of the mountain-shaped second main beam 13 in the upward direction. That is, one of the two top plates 2 (top plate 2 a) is arranged on the upper portion of the second main beam forming body 21, and the other (top plate 2 b) is arranged on the upper portion of the second main beam forming body 22. doing. The two top plates 2 are connected to the second main beam forming body through fastening elements such as bolts and nuts and an adhesive (not shown) in order to maintain the mountain-shaped posture on the second main beam 13. 21 and 22 are fixed.

On the other hand, the mountain-shaped second main beam 13 to which the top plate 2 is fixed is fixed to the first main beam 12 with the top of the mountain shape facing upward. That is, the second main beam 13 is fixed to the first main beam 12 with a part of the side surface in the longitudinal direction in contact with the side surface in the longitudinal direction of the first main beam 12. More specifically, the second main beam 13 has the upper end on both ends in the longitudinal direction aligned with the same height position as the upper end of the first main beam 12, and the middle part in the longitudinal direction of the second main beam 13 is The first main beam 12 is exposed to the upper end from the upper end, and is surface-bonded at a portion in contact with the longitudinal side surface of the first main beam 12. That is, the main beam portion 5 is formed by surface-bonding the side surfaces of the first main beam 12 and the second main beam 13, and has a structure that allows the first main beam 12 to function as a base. . That is, the main beam portion 5 has a so-called simple beam structure, in which the longitudinal direction of the first main beam 12 is horizontal, and a mountain-shaped slope is provided on the upper portion of the first main beam 12 in that state.
Note that a predetermined adhesive is used as means for surface-bonding the first main beam 12 and the second main beam 13.

  As shown in FIG. 6, the two main beam portions 5a and 5b having the simple beam structure formed in this way are arranged with a certain distance apart in such a posture that the side surfaces in the longitudinal direction face each other. Has been. As shown in FIGS. 2 and 4, the sub beam portions 7 a and 7 b are arranged on both ends in the longitudinal direction of the two main beam portions 5 a and 5 b, and both are joined by an adhesive or the like. That is, the two sub beam portions 7a and 7b are fixed to the main beam portions 5a and 5b in a posture facing each other in a direction orthogonal to the facing direction of the two main beam portions 5a and 5b.

  Thus, an enclosed space S surrounded by the four surfaces of the main beam portion 5 and the auxiliary beam portion 7 is formed, and the small beam portion 10 and the reinforcing beam portion 11 are arranged and fixed in the enclosed space S. Specifically, as shown in FIGS. 7 and 8, the three first small beams 17 and the thirteen second small beams 18 that are the small beam portions 10 have a longitudinal direction that is the longitudinal direction of the main beam portion 5. As shown in FIG. 9, the reinforcing beam portion 11 is arranged so that the longitudinal direction thereof is parallel to the longitudinal direction of the main beam portion 5.

  More specifically, as shown in FIG. 10, the three first small beams 17a to 17c are arranged at equal intervals in the longitudinal direction of the main beam portion 5, and one of the first small beams 17b is The main beam portion 5 is fixed at substantially the center in the longitudinal direction. The first small beams 17 a to 17 c are connected to the first main beam 12 on the lower side of the main beam portion 5. That is, in the present embodiment, the three first small beams 17a to 17c are arranged in the longitudinal direction of the first main beam 12 with reference to the first small beam 17b arranged in the longitudinal center of the first main beam 12. One (first small beam 17a) is arranged on the end side of the first main beam 12, and another one (first small beam 17c) is arranged on the other end side in the longitudinal direction of the first main beam 12. And as shown in FIG. 7, each 1st small beam 17a-17c is faced | matched with the inner side surface of the 1st main beam 12 of the opposing attitude | position, and the 1st main beam 12 is used using an adhesive agent etc. It is joined to.

As shown in FIG. 10, the 13 second small beams 18a to 18m are arranged at equal intervals (smaller than the interval between the first small beams 17a to 17c) in the longitudinal direction of the main beam portion 5, One second small beam 18g is fixed at substantially the center of the main beam portion 5 in the longitudinal direction. The second small beams 18 a to 18 m are connected to the second main beam 13 on the upper side of the main beam portion 5. That is, in the present embodiment, the 13 second small beams 18a to 18m are arranged in the longitudinal direction of the second main beam 13 with reference to the second small beam 18g arranged in the longitudinal center of the second main beam 13. Six second small beams 18a to 18f are arranged at equal intervals on the end side of the second main beam 13, and another six second small beams 18h to 18m are arranged at equal intervals on the other end side in the longitudinal direction of the second main beam 13. It is arranged. Then, as shown in FIG. 8, each of the second small beams 18 a to 18 m has its both ends abutted against the inner side surface of the second main beam 13 in the facing posture, and using an adhesive or the like, the second main beam 13. It is joined to.
In the present embodiment, the upper ends of the second small beams 18 a to 18 m joined to the second main beam 13 are set at positions where the upper ends thereof are substantially flush with the upper end of the second main beam 13.

  As shown in FIGS. 9 and 10, the reinforcing beam portion 11 is fixed on the lower side of the main beam portion 5 and along the inner side surface in the longitudinal direction of the main beam portion 5. That is, the reinforcing beam portion 11 is arranged with its longitudinal direction along the longitudinal direction of the first main beam 12, and is joined to the inner side surface of the first main beam 12 using an adhesive or the like. . More specifically, the reinforcing beam portion 11 has its width direction end joined to the inner side surface of the first main beam 12.

  As described above, in the present embodiment, the first main beam 12 extending in a substantially horizontal direction is supported by the second main beam 13 inclined in a mountain shape, and the top plate 2 is fixed to the second main beam 13. Since the configuration is adopted, all of the horizontal component forces (horizontal component forces) acting by the weight of the second main beam 13 and the top plate 2 can be applied to the first main beam 12. That is, since the cover 1 for water treatment facilities of this embodiment is a structure which does not make a horizontal component force act outside, it can be considered that it is the same structure as the simple beam structure formed only with the 1st main beam 12. FIG. In the present embodiment, the inclined portion of the top plate 2 formed by the second main beam 13 can be secured while having a simple beam structure. For this reason, according to the present embodiment, even if the top plate 2 is bent, it is possible to remove the earth and sand that can be accumulated along the inclination of the second main beam 13, so Appearance is not impaired. Furthermore, in this embodiment, unlike the conventional mountain-shaped cover, there is no need to consider the horizontal component force when installing in the water tank 30, so that installation effort is hardly generated.

  In the said embodiment, although the structure which has arrange | positioned the 2nd main beam 13 inside the 1st main beam 12 arrange | positioned so that a longitudinal direction side surface may be opposed, this invention is not limited to this, 2nd main beam You may arrange | position the beam 13 outside the 1st main beam 12 arrange | positioned so that a longitudinal direction side surface may oppose.

  In the said embodiment, although the structure of the cover 1 for water treatment facilities which can obstruct | occlude the opening part 31 of one water tank 30 using the several cover 1 for water treatment facilities was shown, this invention is not limited to this, The configuration may be such that the opening of one water tank can be closed with one water treatment facility cover.

  In the above embodiment, the second main beam 13 has a configuration in which the longitudinal ends of the second main beam forming bodies 21 and 22 are simply butted together and bonded with an adhesive, but the present invention is not limited thereto, Instead of or in addition to the adhesive, a configuration in which the second main beam forming bodies 21 and 22 are joined together using a plate-like seam reinforcing material may be used. According to this configuration, even if a shear force is applied to the joint between the second main beam forming bodies 21 and 22, the seam reinforcing material can counteract, so that a strength against a certain level of shear force can be imparted.

  In the said embodiment, although the structure of the cover 1 for water treatment facilities formed by FFU was shown, this invention is not limited to this, Materials other than FFU, ie, wood, other resin (carbon resin etc.) It may be the structure of the cover for water treatment facilities formed by.

  In the above embodiment, the configuration in which the first main beam 12 and the second main beam 13 are surface-bonded with an adhesive is shown. However, the present invention is not limited to this, and in addition to or in place of the adhesive, You may use a nut, a binding band, etc. as a joining means of the 1st main beam 12 and the 2nd main beam.

DESCRIPTION OF SYMBOLS 1 Cover for water treatment facility 2 Top plate 3 Beam member 5 Main beam part 7 Secondary beam part 10 Small beam part 11 Reinforcement beam part 12 First main beam 13 Second main beam 17 First small beam 18 Second small beam 21 2 Main beam forming body (plate-like member)
22 Second main beam forming body (plate-like member)
25 First beam forming body 26 Second beam forming body 30 Water tank 31 Opening

Claims (5)

The top plate supported by the beam is a cover for a water treatment facility that covers part or all of the opening formed in the upper part of the water tank or water channel,
The beam has at least two sets of main beam portions;
The main beam portion includes a first main beam extending in a substantially horizontal direction and a second main beam inclined in a mountain shape upward.
The second main beam is supported by the first main beam, and at least a part of the upper portion of the second main beam is exposed above the first main beam so as to fix the top plate. In this state, it is fixed to the side surface in the longitudinal direction of the first main beam ,
The second main beam has a structure in which the ends of two straight plate-like members are butted together, and at least the upper side of the plate-like member has a mountain shape . The cover for a water treatment facility according to claim 1, wherein the first main beam and the second main beam are abutted with each other and are surface-bonded with an adhesive. The cover for a water treatment facility according to claim 1 or 2 , wherein a seam reinforcing material for reinforcing a seam between two plate-like members is connected to the abutting portion of the second main beam. Two sets of main beam portions each having the second main beam fixed to the first main beam, and formed so as to be separated from each other in a state where the longitudinal side surfaces of the two sets of main beam portions are opposed to each other. The water treatment facility cover according to any one of claims 1 to 3 , wherein a small beam extending in a direction intersecting the longitudinal direction of the main beam portion is provided in the interval. The cover for a water treatment facility according to any one of claims 1 to 4 , wherein a reinforcing beam is fixed near a lower portion of a longitudinal side surface of the first main beam.

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