Movable Cover

Abstract

To provide a movable cover lid excellent in load-bearing performance.SOLUTION: A movable cover lid 1 comprises: a cover body 10 having a top plate 11, and sidewalls 12 and 13 vertically provided downward at positions facing each other of both ends in a width direction of the top plate 11 on a lower surface 11a of the top plate 11; a wheel fixing L-angle 20 fixed to outside surfaces 12a and 13a of the sidewalls 12 and 13; and a wheel 30 fixed to the wheel fixing L-angle 20. The sidewalls 12 and 13 are made of a reinforcing filament fiber-resin composite. The sidewalls 12 and 13 have a thickness of 15 mm or more and 30 mm or less, and a density of 0.70 g / cm3 or more and 0.80 g / cm3 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a movable cover. [Background technology]

[0002] Conventionally, water treatment facilities are provided with cover lids depending on the purpose and use of the facility. For example, cover lids for tanks (such as filtration ponds) in water purification facilities are installed mainly for the purpose of preventing the growth of algae in the tanks and preventing the intrusion of foreign matter. Also, cover lids for tanks (such as grit basins) in sewage treatment facilities are installed mainly for the purpose of preventing odors and preventing objects from falling into the tanks.

[0003] This type of cover needs to be opened when checking the condition inside the tank (filtration state or sedimentation state), when performing maintenance and inspection inside the tank, or when general visitors are touring the water treatment facility. In particular, when visitors are touring the facility, the target tank or the like is only opened temporarily, so it is desirable that the cover be configured to be easily opened and closed. Therefore, a technology (movable cover) is known in which movable wheels are provided on the cover to allow it to be moved as needed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-167094 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional covers that are placed flat on the tank opening are designed so that the entire frame on which the cover is attached receives the load. In contrast, movable covers are designed so that the load is received at the wheel mounting area. As a result, stress is concentrated at the wheel mounting area of ​​movable covers, limiting the range of the cover's load-bearing capacity. Specifically, movable covers are restricted in areas with heavy snowfall. Therefore, it was necessary to reinforce the wheel mounting area of ​​movable covers.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a movable cover having excellent load-bearing performance. [Means for solving the problem]

[0007] The present invention has the following aspects. [1] A cover body having a top plate portion and side wall portions extending downward from the underside of the top plate portion at positions opposite to each other at both ends of the top plate portion in the width direction; a wheel fixing L-angle fixed to the outer surface of the side wall portion; a wheel fixed to the wheel fixing L angle, The side wall portion includes a reinforced long fiber resin molding, The thickness of the side wall portion is 15 mm or more and 30 mm or less, The density of the side wall is 0.70 g / cm 3 More than 0.80g / cm 3 Below is the movable cover. [2] A movable cover as described in [1], in which the wheel fixing L-angle is fixed to the side wall portion by an L-angle fixing bolt inserted into a sleeve fitted into a bolt hole that penetrates the side wall portion in the thickness direction. [3] The movable cover according to [2], wherein the sleeve is made of stainless steel. [Effects of the Invention]

[0008] According to the present invention, a movable cover having excellent load-bearing performance can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a front view showing a movable cover according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view showing a movable cover according to an embodiment of the present invention. [Figure 3] FIG. 2 is a side view showing a movable cover according to an embodiment of the present invention. [Figure 4] FIG. 2 is an enlarged view of a part of FIG. [Figure 5] 3 is a longitudinal cross-sectional view of a sleeve constituting a movable cover according to one embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a front view showing a sleeve that constitutes a movable cover according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The movable cover of the present invention will be described below with reference to an embodiment, but the present invention is not limited to the following embodiment.

[0011] Fig. 1 is a front view showing a movable cover according to one embodiment of the present invention. Fig. 2 is a plan view showing a movable cover according to one embodiment of the present invention. Fig. 3 is a side view showing a movable cover according to one embodiment of the present invention. Fig. 4 is an enlarged view of a portion of Fig. 1. Fig. 5 is a longitudinal cross-sectional view of a sleeve constituting a movable cover according to one embodiment of the present invention. Fig. 6 is a front view showing a sleeve constituting a movable cover according to one embodiment of the present invention. In the drawings used in the following explanation, for the sake of convenience, characteristic parts may be shown enlarged to make the features easier to understand, and the dimensional ratios of each component may differ from the actual ones. Furthermore, in the following explanation, unless otherwise specified, the vertical and horizontal positional relationships will be explained based on the normal installation position (Figure 1).

[0012] As shown in Fig. 1, the movable cover 1 of this embodiment is disposed above an opening 101 of a water tank 100 (or a water channel) in, for example, a water treatment facility (such as a sewage treatment plant or a water purification plant). The movable cover 1 of this embodiment is movable in a certain direction on L-angle wheels 110 (rails for the movable cover) disposed on opening edges 102, 103 on both sides of the water tank 100.

[0013] The movable cover 1 includes a cover body 10, an L-angle for wheel mounting 20, and a wheel 30. The movable cover 1 may also include a wheel fixing bolt 40, an L-angle fixing bolt 50, and a sleeve 60.

[0014] As shown in FIG. 1, the cover body 10 is a cover body that is approximately U-shaped when viewed from the front. The cover body 10 is composed of a top plate 11 and two side wall portions 12 and 13. Specifically, the two side wall portions 12 and 13 are vertically extended downward from both widthwise ends of the lower surface 11a of the flat top plate 11. That is, the two side wall portions 12 and 13 are vertically extended in positions that face each other across the top plate 11. The vertical directions of the side wall portions 12 and 13 are approximately parallel to each other, and the vertical lengths of each are equal.

[0015] The wheel mounting L-angle 20 is positioned so that the outer surface (outer surface of the L shape) 21a of one side 21 is in contact with the outer surface 12a of the side wall 12. An L-angle fixing bolt 50 is inserted through a bolt hole 21b of one side 21 and a bolt hole 12b of the side wall 12, and the L-angle fixing bolt 50 is tightened with a nut 70, thereby fixing the wheel mounting L-angle 20 to the outer surface 12a of the side wall 12. As a result, the other side 22 of the wheel mounting L-angle 20 is positioned approximately parallel to the upper surface of the top plate 11 and extends outward from the outer surface 12a of the side wall 12. The bolt hole 21b of one side 21 of the wheel mounting L-angle 20 is formed in the center of the one side 21 so as to penetrate the one side 21 in the thickness direction. The bolt hole 12b is formed in the center of the side wall portion 12 in the height direction so as to penetrate the side wall portion 12 in a direction perpendicular to the height direction.

[0016] The wheel mounting L-angle 20 is positioned so that the outer surface (outer surface of the L shape) 21a of one side 21 is in contact with the outer surface 13a of the side wall 13. An L-angle fixing bolt 50 is inserted through the bolt hole 21b of one side 21 and the bolt hole 13b of the side wall 13, and the L-angle fixing bolt 50 is tightened with a nut 70, thereby fixing the wheel mounting L-angle 20 to the outer surface 13a of the side wall 13. As a result, the other side 22 of the wheel mounting L-angle 20 is positioned approximately parallel to the upper surface of the top plate 11 and extends outward from the outer surface 13a of the side wall 13. The bolt hole 13b is formed in the center of the side wall 13 in the height direction, penetrating the side wall 13 in a direction perpendicular to the height direction.

[0017] It is preferable that a sleeve 60 is fitted into each of the bolt holes 12b of the side wall portion 12 and the bolt holes 13b of the side wall portion 13. It is preferable that an L-angle fixing bolt 50 is inserted into the sleeve 60.

[0018] The wheel 30 is fixed to the other side 22 of the wheel mounting L-angle 20 by a wheel fixing bolt 40. As a result, the wheel 30 is suspended downward from the other side 22 of the wheel mounting L-angle 20.

[0019] The wheeled L-shaped angle 110 is positioned on each of the opening edges 102, 103 on both sides of the water tub 100. The wheeled L-shaped angle 110 is positioned so that the outer surface (outer surface of the L shape) 111a of one side 111 is in contact with the opening edge 102 of the water tub 100. An anchor bolt 120 embedded perpendicular to the opening edge 102 is inserted into the bolt hole 111b of one side 111, and the anchor bolt 120 is tightened with a nut 121, thereby fixing the wheeled L-shaped angle 110 to the opening edge 102 of the water tub 100. As a result, the other side 112 of the wheeled L-shaped angle 110 is positioned perpendicular to the opening edge 102 of the water tub 100.

[0020] Furthermore, wheel-movable L-shaped angle 110 is positioned so that the outer surface (outer surface of the L shape) 111a of one side 111 is in contact with opening edge 103 of water tub 100. An anchor bolt 120 embedded perpendicular to opening edge 103 is inserted into bolt hole 111b of one side 111, and anchor bolt 120 is tightened with nut 121, thereby fixing wheel-movable L-shaped angle 110 to opening edge 103 of water tub 100. As a result, the other side 112 of wheel-movable L-shaped angle 110 is positioned perpendicular to opening edge 103 of water tub 100.

[0021] As described above, by placing wheels 30 on end face 112a of the other side 112 of wheel-moving L-shaped angle 110, which is arranged perpendicular to opening edge 102 and opening edge 103 of water tub 100, movable cover 1 can be moved on the other side 112 of wheel-moving L-shaped angle 110. In other words, movable cover 1 can be moved on opening edges 102, 103 on both sides of water tub 100.

[0022] The material of the cover body 10, i.e., the top plate portion 11 and the two side wall portions 12, 13, is not particularly limited, but from the viewpoint of lightness, it is preferable that the material be a molded body containing reinforced long fiber resin (fiber reinforced plastics; FRP) (hereinafter, sometimes referred to as a "reinforced long fiber resin molded body"). The reinforced long fiber resin includes long fibers and a resin that binds the long fibers together. Examples of long fibers include carbon fibers, glass fibers, aramid fibers, and the like, each having an average fiber length of 50 mm or more. Examples of the resin include polyester resin, vinyl ester resin, epoxy resin, phenol resin, and urethane resin. The reinforced long fiber resin molding is not particularly limited, but for example, Eslon Neo Lumber FFU (trade name) manufactured by Sekisui Chemical Co., Ltd. is preferred.

[0023] It is preferable that the top plate 11 and the side walls 12, 13 are formed in part or in whole from a reinforced long-fiber resin molding. The top plate 11 and the side walls 12, 13 configured in this manner have the advantage of being more corrosion-resistant than metal covers, etc. Furthermore, the top plate 11 and the side walls 12, 13 have the advantage of being lightweight and having high rigidity against bending.

[0024] The thickness of the side walls 12 and 13 (T shown in FIGS. 1 and 4) is 15 mm or more and 30 mm or less.

[0025] The density of the reinforced long fiber resin molding that constitutes the side wall portions 12, 13 is 0.70 g / cm 3 More than 0.80g / cm 3 is less than 0.71 g / cm 3 More than 0.77g / cm 3 The following is preferable: If the density of the reinforced long fiber resin moldings constituting the side wall portions 12, 13 is less than the above-mentioned lower limit, the compressive strength of the side wall portions 12, 13 will be insufficient, and the side wall portions 12, 13 may be damaged when a compressive force is applied to the side wall portions 12, 13 in the height direction of the movable cover 1, i.e., in the thickness direction of the top plate portion 11. If the density of the reinforced long fiber resin moldings constituting the side wall portions 12, 13 exceeds the above-mentioned upper limit, the content of long fibers in the reinforced long fiber resin moldings will be excessive, making it impossible to mold the reinforced long fiber resin moldings.

[0026] The density of the reinforced long fiber resin molding that constitutes the top plate portion 11 is 0.70 g / cm 3 More than 0.80g / cm 3 Preferably less than 0.71 g / cm 3 More than 0.77g / cm 3 The following is more preferable: If the density of the reinforced long fiber resin molding that constitutes the top plate portion 11 is less than the above-mentioned lower limit, the compressive strength of the reinforced long fiber resin molding will decrease, and the load-bearing performance of the lid will deteriorate. If the density of the reinforced long fiber resin molding that constitutes the top plate portion 11 exceeds the above-mentioned upper limit, the ratio of long fibers to resin will increase, making it difficult to produce the reinforced long fiber resin molding.

[0027] 5 and 6, the sleeve 60 is a cylindrical member, and its inner circumferential surface 60a and outer circumferential surface 60b are preferably smooth surfaces without any irregularities, etc. This allows the entire outer circumferential surface 60b of the sleeve 60 to withstand compressive force when a compressive force is applied to the movable cover 1 in the height direction, i.e., the side wall portions 12, 13 in the height direction (thickness direction of the top plate portion 11), thereby preventing damage to the side wall portions 12, 13 at the bolt holes 12a, 13a.

[0028] The thickness of the sleeve 60 (t shown in FIG. 5) is preferably 2 mm or more and 4 mm or less. The outer diameter of the sleeve 60 (w shown in FIG. 5) is preferably 16 mm or more and 20 mm or less. The length of the sleeve 60 (l shown in FIG. 5) is preferably 15 mm or more and 30 mm or less.

[0029] The materials for the wheel mounting L-angle 20, wheel 30, wheel fixing bolt 40, L-angle fixing bolt 50, sleeve 60, and anchor bolt 120 are not particularly limited, but stainless steel is preferable from the standpoints of durability and corrosion resistance. The stainless steel is not particularly limited, but examples include SUS304, SUS30, etc. SUS304 is preferred because of its superior durability and corrosion resistance.

[0030] According to the movable cover 1 of this embodiment, the density of the reinforced long fiber resin molding that constitutes the side wall portions 12, 13 is 0.70 g / cm 3 More than 0.80g / cm 3 Since the thickness is less than 1 / 2 mm, the compressive strength of the side wall portions 12 and 13 is improved, and the load-bearing capacity of the movable cover 1 is improved. In addition, according to the movable cover 1 of this embodiment, a sleeve 60 is fitted into each of the bolt holes 12b of the side wall portion 12 and the bolt hole 13b of the side wall portion 13, and an L-angle fixing bolt 50 is inserted into the sleeve 60, thereby increasing the compression area of ​​the reinforced long fiber resin molding that constitutes the side wall portions 12, 13, distributing the load on the side wall portions 12, 13, and improving the load-bearing performance of the movable cover 1.

[0031] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the embodiments are merely illustrative of the present invention. Therefore, the present invention is not limited to the configurations of the embodiments, and design changes within the scope of the present invention are also included within the scope of the present invention. Furthermore, for example, when multiple configurations are included in each embodiment, possible combinations of these configurations are also included, even if not specifically stated. Furthermore, when multiple examples or variations are disclosed in an embodiment as the present invention, possible combinations of configurations across these are also included, even if not specifically stated. Furthermore, configurations depicted in the drawings are also included, even if not specifically stated. Furthermore, when the term "etc." is used, it is used to mean that equivalents are included. [Example]

[0032] The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0033] [Example 1] A movable cover as shown in Figure 1 was fabricated. As shown in Table 1, the reinforced long fiber resin molding constituting the side wall portion of the movable cover was made of Eslon Neo Lumber FFU74 (trade name) manufactured by Sekisui Chemical Co., Ltd. Furthermore, without fitting a sleeve into the bolt hole in the side wall portion, a wheel fixing L angle to which the wheel is fixed is fixed to the side wall portion.

[0034] [Example 2] A movable cover as shown in Figure 1 was fabricated. As shown in Table 1, the reinforced long fiber resin molding constituting the side wall portion of the movable cover was made of Eslon Neo Lumber FFU74 (trade name) manufactured by Sekisui Chemical Co., Ltd. In addition, a cylindrical sleeve made of SUS304 was fitted into the bolt hole in the side wall, and a wheel fixing L-angle with a wheel fixed thereto was fixed to the side wall. Table 1 shows the sleeve thickness t, sleeve outer diameter w, and sleeve length l.

[0035] [Comparative Example 1] A movable cover as shown in Figure 1 was fabricated. As shown in Table 1, the reinforced long fiber resin molding constituting the side wall portion of the movable cover was made of Eslon Neo Lumber FFU50 (trade name) manufactured by Sekisui Chemical Co., Ltd. Furthermore, without fitting a sleeve into the bolt hole in the side wall portion, a wheel fixing L angle to which the wheel is fixed is fixed to the side wall portion.

[0036] [evaluation] (Load test of movable cover) The proportional limit compressive load when a movable cover was compressed in the height direction using general-purpose steel material was measured using a Tensilon universal material testing machine (product name: UCT-10T, manufactured by Orientec Co., Ltd.). The compression rate was 0.1 mm / min. The load-bearing value results are shown in Table 1.

[0037] (durability against snow accumulation) Snow was piled up on the movable cover, and the amount of snow (snow height) until the movable cover was damaged was calculated. The amount of snow accumulation was calculated using the following formula (1). Snow accumulation [cm] = {(load capacity [N] / safety factor [-]) × number of bolts [pcs] - weight of lid [N]} / (lid area [m 2 ] x snow load per unit area [N / m 2 ]) (1) In formula (1), the load capacity is the value per bolt (test result) [N], the safety factor is 2.0 [-], the number of bolts is 9 (the number of bolts when the load is supported by three of the four wheels), the weight of the lid is 1058N, and the lid area is 4.5m 2 , snow load per unit area is 30N / m 2 (For every 1cm of snow depth, source: Building Standards Act Enforcement Regulations). The results are shown in Table 1.

[0038] [Table 1]

[0039] From the results shown in Table 1, the load capacity value of Example 1 was 2105 N, which was more than twice the load capacity value of 999 N of Comparative Example 1. Furthermore, the load capacity value of Example 2 was 3611 N, which was more than three times the load capacity value of 999 N of Comparative Example 1. From the results shown in Table 1, the snow accumulation in Example 1 was 62 cm, which was more than twice the snow accumulation of 25 cm in Comparative Example 1. Furthermore, the snow accumulation in Example 2 was 112 cm, which was more than four times the snow accumulation of 25 cm in Comparative Example 1. [Explanation of symbols]

[0040] 1 Movable cover 10 Cover body 11 Top plate 12,13 Side wall 20 L-angle for wheel mounting 30 wheels 40 Wheel fixing bolt 50 L angle fixing bolt 60 sleeves 100 aquariums 101 Opening 102,103 Opening edge 110 L-angle for movable wheels

Claims

1. a cover body having a top plate portion and side wall portions extending downward from the underside of the top plate portion at positions facing each other at both ends of the top plate portion in the width direction; a wheel fixing L-angle fixed to the outer surface of the side wall portion; a wheel fixed to the wheel fixing L angle, The side wall portion includes a reinforced long fiber resin molding, The wheel fixing L-angle is fixed to the side wall portion by an L-angle fixing bolt inserted into a cylindrical sleeve fitted into a bolt hole passing through the side wall portion in the thickness direction, The thickness of the sleeve is 2 mm or more and 4 mm or less, the outer diameter of the sleeve is 16 mm or more and 20 mm or less, and the length of the sleeve is 15 mm or more and 30 mm or less, the density of the side wall portion is 0.70 g / cm 3 or more and 0.80 g / cm 3 or less; The sleeve is made of stainless steel.

2. The movable cover according to claim 1 , wherein the thickness of the side wall portion is 15 mm or more and 30 mm or less.

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