Water-resistant material for corner beveling

Abstract

To provide a water-shielding member for flush boards capable of improving workability in installing and adjusting water volume of a flush board type water gate.SOLUTION: A water-shielding member 10 for flush boards includes: a plurality of square timbers 1 damming a waterway; and a connecting plate 2 connecting the plurality of square timbers 1 in parallel and in a row. The connecting plate 2 is located on one or both of a side surface facing an upstream side of the waterway and a side surface facing a downstream side of the waterway.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a watertight member for corner shaping. [Background technology]

[0002] For example, a sluice gate is known as a device for blocking waterways when performing maintenance, inspection, or water volume adjustment for waterways such as sewage treatment facilities, agricultural irrigation canals, and aquaculture facilities (for example, Patent Documents 1 and 2). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2004-238946 [Patent Document 2] Japanese Patent Application Publication No. 11-166225 [Overview of the project] [Problems that the invention aims to solve]

[0004] A typical drop-in type sluice gate involves installing guide grooves extending vertically into the side walls of the waterway, and inserting both ends of a square timber into the guide grooves and dropping it in, thereby stacking multiple square timbers within the waterway to form a watertight wall. When installing a corner-type sluice gate or adjusting the water flow, the work is inefficient because the timbers have to be stacked one by one or lifted and removed one by one to ensure the impermeable wall reaches the required height. Furthermore, while making the lumber lighter makes it easier to handle, if its specific gravity is less than 1, for example, it will float instead of sinking in water, requiring the attachment of weights, which worsens work efficiency.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a watertight member for corner-type sluice gates that can improve workability when installing corner-type sluice gates or when adjusting the water volume. [Means for solving the problem]

[0006] [1] A watertight barrier for corner blocking, comprising a plurality of square timbers for blocking a waterway and a connecting plate that connects the plurality of square timbers in parallel and in a line, wherein the connecting plate is present on one or both of the sides of the square timbers facing the upstream side of the waterway and the sides facing the downstream side of the waterway. [2] The corner-cutting water-blocking member according to [1], wherein the connecting plate has a suspension attachment portion. [3] A corner-cutting water-blocking member according to [1] or [2], having fasteners for fastening the square timber and the connecting plate. [4] A watertight corner-cutting member of [3], wherein an overtightening prevention plate is present on the side of the square timber opposite to the side on which the connecting plate is present, and the fastener penetrates the square timber to fasten the connecting plate, the square timber, and the overtightening prevention plate. [5] The watertight corner-cutting member according to any one of [1] to [4], wherein the total mass of the plurality of square timbers is 300 to 1000 kg. [6] The corner-cutting water-blocking member according to any one of [1] to [5], wherein the square timber is a long fiber reinforced resin molded body. [Effects of the Invention]

[0007] The watertight barrier member for corner gates of the present invention allows for the integrated handling of multiple corner timbers, thereby improving work efficiency during the installation of corner gates and water volume adjustments. Furthermore, since the connecting plate can also serve as a weight, the effort required to attach a weight is eliminated when the lumber is lightweight, thus improving work efficiency. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view showing one embodiment of the watertight barrier member for corner beveling according to the present invention. [Figure 2] This is a plan view of Figure 1, seen from above. [Figure 3] This is a cross-sectional view along line AA in Figure 2. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. Note that the following figures are schematic diagrams for explaining the configuration in an easy-to-understand manner, and the dimensional ratios of each component may be different from the actual ones.

[0010] Figs. 1 to 3 show the water-blocking member for corner turning of the present embodiment. Fig. 1 is a front view showing the state installed in the water channel, Fig. 2 is a plan view seen from above Fig. 1, and Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 2. Reference numeral 20 in the figure is a corner-turning type water gate provided at the weir portion of the water channel. The corner-turning type water gate 20 has a pair of guide grooves 21 existing on both side wall portions in the width direction of the water channel and the water-blocking member 10 for corner turning. The guide grooves 21 guide and hold both end portions of the water-blocking member 10 for corner turning. The water-blocking member 10 for corner turning has a corner member 1 for blocking the water channel, a connecting plate 2 and an over-tightening prevention plate 5 for connecting a plurality of corner members 1 in parallel and in a row, and a fastener 4 for fixing the connecting plate 2 and the over-tightening prevention plate 5 to the corner member 1. The longitudinal direction of the corner member 1 is the width direction of the water channel. In the corner-turning type water gate 20 of the present embodiment, the water-blocking members 10 for corner turning in the lower stage, the water-blocking members 10 for corner turning in the middle stage, and the water-blocking members 10 for corner turning in the upper stage are stacked in order from the bottom to form a water-blocking wall. W in Fig. 1 indicates the width of the water channel, and H indicates the height of the water-blocking wall. The arrow P in Fig. 2 indicates the direction of the water pressure applied to the water-blocking member 10 for corner turning (the flow direction of the water channel).

[0011] (Corner member 1) The corner member 1 has a substantially rectangular parallelepiped shape. The plurality of corner members 1 constituting the water-blocking member 10 for corner turning are parallel to each other, and the side surfaces facing the downstream side of the water channel (hereinafter also referred to as "downstream side surfaces") 1c and the side surfaces facing the upstream side (hereinafter also referred to as "upstream side surfaces") 1d are flush with each other. For the purpose of improving the water-blocking function of the water-blocking member 10 for corner turning and preventing misalignment during stacking, the surfaces where the corner members 1 contact each other have an uneven fitting structure. In the present embodiment, there is a convex strip 1a extending in the longitudinal direction on the upper surface of the corner member 1, and there is a concave groove 1b on the lower surface of the corner member 1 into which the convex strip 1a of another corner member 1 fits from below. The timber 1 has handles 6 for carrying it. On one timber 1, there is one handle 6 on the downstream side 1c and one on the upstream side 1d. These two handles 6 are symmetrical with respect to the center of gravity of the timber 1. At both ends of the rectangular timber 1 in the longitudinal direction, a sealing member 7 made of rubber or the like is fixed to the downstream side surface 1c.

[0012] The dimensions of the timber 1 are preferably such that the length in the width direction (longitudinal direction) of the waterway is 750 to 8000 mm, the height in the vertical direction of the waterway is 150 to 600 mm, and the thickness in the direction perpendicular to the width and height directions (hereinafter also referred to as the "flow direction of the waterway") is 50 to 350 mm.

[0013] Examples of materials for the square timber 1 include stainless steel, wood, and fiber-reinforced plastic (FRP). FRP is preferred from the viewpoint of lightness. FRP is preferably a long-fiber reinforced resin containing long fibers with an average fiber length of 50 mm or more and a resin that binds the long fibers together. Examples of long fibers include carbon fibers, glass fibers, and aramid fibers. Examples of resins include polyester resin, vinyl ester resin, epoxy resin, phenolic resin, and urethane resin.

[0014] The square bar 1 made of FRP is preferably a long fiber reinforced resin molded body consisting of long fibers and a cured product of a resin composition that binds the long fibers. The resin composition may contain a foaming agent, and the cured product may be a foam containing voids. A long-fiber reinforced resin molded article can be manufactured, for example, by spraying a resin composition containing a foaming agent onto a long fiber bundle in which continuous fibers are aligned in one direction, impregnating it, and then foaming and curing the resin composition in a mold. As an example of a long-fiber reinforced resin molded article in which glass fibers consist of continuous long fibers and the resin composition contains urethane resin and a foaming agent, Eslon Neo Lumber FFU (trade name) manufactured by Sekisui Chemical Co., Ltd. can be cited.

[0015] The specific gravity of long fiber reinforced resin molded articles is 0.50 to 0.80 g / cm³. 3This is preferable. If the specific gravity of the long-fiber reinforced resin molded article is above the lower limit of the above range, it exhibits excellent bending strength and superior durability of the corner-cutting waterproofing member. If it is below the upper limit, the proportion of long fibers to the resin is not too high, making it easier to manufacture the molded article. The compressive strength (allowable compressive stress) of a long fiber reinforced resin molded article is, for example, 5 to 8 N / mm². 2 This is preferable. The compressive strength of the long fiber reinforced resin molded article is a value measured in accordance with the method specified in JIS Z 2101.

[0016] The rectangular bar 1, which is a long-fiber reinforced resin molded body, may also be a laminate formed by laminating plate-shaped members made of long-fiber reinforced resin molded bodies with a smaller thickness than the rectangular bar 1, and bonding them together using an adhesive. The rectangular bar 1, which is a laminate of plate-shaped members, is used with the lamination direction of the plate-shaped members aligned with the flow direction of the waterway. Examples of adhesives include urea resin, melamine resin, phenolic resin, resorcinol resin, urethane resin, modified silicone, and epoxy resin.

[0017] In one corner-cutting waterproofing member 10, there is one connecting plate 2 on the downstream side 1c and one on the upstream side 1d of the corner timber 1. These two connecting plates 2 are symmetrical with respect to the center of gravity of the corner-cutting waterproofing member 10. The structure of the connecting plate 2 is preferably such that it has a strip-shaped flat portion 2a that is in close contact with the downstream side 1c and upstream side 1d of the multiple square timbers 1, and a rising portion 2b that rises from the flat portion 2a. The connecting plate 2 in this embodiment is made of equal-leg angle steel (L-angle). Other materials such as unequal-leg angle steel or channel steel may also be used.

[0018] The dimensions of the flat plate portion 2a of the connecting plate 2 are preferably such that the length in the vertical direction (longitudinal direction) of the waterway is 1000 to 1400 mm, the width in the horizontal direction of the waterway is 75 to 100 mm, and the thickness in the flow direction of the waterway is 6 to 10 mm. The height of the rising portion 2b in the flow direction of the waterway is preferably 75 to 100 mm. The flat plate portion 2a has multiple through holes for fastening the connecting plate 2 and the multiple square timbers 1 with fasteners 4. The diameter of these through holes is preferably 14 to 20 mm.

[0019] The material of the connecting plate 2 can be aluminum, iron, plastic, or stainless steel, with stainless steel being preferred from the viewpoint of corrosion resistance, and SUS304 being more preferred.

[0020] The rising portion 2b of the connecting plate 2 has a suspension mounting portion 2c for attaching the suspension device 3. The lifting device 3 is a component on which a wire rope is attached when lifting the corner-cutting waterproofing member 10. In this embodiment, the lifting device 3 is a shackle, and the lifting device mounting portion 2c is a through hole through which the bolt of the shackle passes. The nominal size of the shackle is preferably 14 to 20 mm. The material of the suspension device 3 can be iron, plastic, or stainless steel, with stainless steel being preferred from the viewpoint of corrosion resistance, and SUS304 being more preferred.

[0021] The fastener 4 is a hexagonal bolt and nut, preferably with a nominal diameter of M12 to M16 mm and a length of 160 to 210 mm. The material of the fastener 4 can be iron, plastic, or stainless steel, with stainless steel being preferred from the viewpoint of corrosion resistance, and SUS304 being more preferred.

[0022] To prevent the timber 1 from sinking due to overtightening of the fastener 4, it is preferable to provide an overtightening prevention plate 5 on the side opposite to the side where the connecting plate 2 is located. That is, the timber 1 is sandwiched between the overtightening prevention plate 5 and the flat plate portion 2a of the connecting plate 2, and the overtightening prevention plate 5, the timber 1, and the connecting plate 2 are fastened together with the fastener 4. The fastener 4 penetrates the timber 1 and fastens the connecting plate 2, the timber 1, and the overtightening prevention plate 5 together. The size of the overtightening prevention plate 5 may be the same as the flat plate portion 2a of the connecting plate 2. Specifically, it is preferable that the length in the vertical direction (longitudinal direction) of the waterway is 1000 to 1400 mm, the width in the width direction of the waterway is 75 to 100 mm, and the thickness in the flow direction of the waterway is 6 to 10 mm. The material of the overtightening prevention plate 5 can be iron, plastic, or stainless steel, with stainless steel being preferred from the viewpoint of corrosion resistance, and SUS304 being more preferred. In this embodiment, the overtightening prevention plate 5 is a steel plate.

[0023] The number of corner timbers 1 that make up one corner-cutting waterproofing member 10 is preferably 2 to 4. The total mass of the multiple timbers 1 that make up one corner-cutting waterproofing member 10 is preferably 300 to 5600 kg, and more preferably 300 to 1000 kg. Corner-cutting waterproofing members weighing less than 300 kg are used in relatively small waterways and the number to be stacked is small, so they can be made from a single timber. If the total mass of the timber 1 exceeds 5600 kg, the compressive stress applied to the lifting device attachment part 2c during lifting will exceed the allowable compressive stress of the timber 1 material, making the timber 1 prone to breakage. If the total mass of the timber 1 is 1000 kg or less, it is easier to ensure the strength of each component, such as the bending strength and tensile strength of the connecting plate 2 during lifting, and the shear strength of the lifting and fastening devices.

[0024] The method for installing the corner-cut waterproofing member 10 is as follows: First, a wire rope 8 is attached to the lifting device 3 of the lower corner-cut waterproofing member 10, and the member is lifted using an appropriate device, and both ends of the corner-cut waterproofing member 10 are dropped into a pair of guide grooves 21. A bottom member 22 connecting the lower ends of a pair of guide grooves 21 may be provided in advance at the bottom of the waterway, and a sealing member (not shown) made of rubber or the like may be fixed to the bottom surface of the lower corner-cutting water-blocking member 10.

[0025] Next, the corner-cutting waterproofing members 10 for the middle section and the upper section are lifted in order by attaching wire ropes 8 to the lifting device 3 and dropping them into the guide groove 21, thereby stacking the corner-cutting waterproofing members 10. The lower, middle, and upper section corner-cutting waterproofing members 10 come into close contact with each other due to their own weight. A wedge 9 is driven between the upstream side 1d of the uppermost square timber 1 and the guide groove 21, and the corner-cutting waterproofing member 10 is fixed inside the guide groove 21. In this way, a watertight wall is formed by stacking multiple pieces of timber 1 on top of each other. Furthermore, it is not necessary to provide a protruding ridge 1a on the upper surface of the corner-cutting waterproofing member 10, which is the uppermost layer.

[0026] According to the corner-dropping water-blocking member 10 of this embodiment, multiple corner timbers 1 can be handled integrally, thereby improving work efficiency when installing a corner-dropping type sluice gate or adjusting the water volume. Furthermore, since the corner-cutting waterproofing member 10 has members such as connecting plates 2 in addition to the square timber 1, the specific gravity can be adjusted without attaching weight members even if the specific gravity of the square timber 1 is less than 1. For example, members other than the square timber 1, such as connecting plates, can be made of a material with a high specific gravity, such as steel, and can also serve as weight members. Therefore, even if the square timber 1 is made lighter, the effort of attaching weight members for specific gravity adjustment can be saved, improving work efficiency.

[0027] In this embodiment, two connecting plates 2 are provided for one corner-cutting waterproofing member 10, but there may be one connecting plate 2 or three or more. It is preferable to provide two or more connecting plates 2 for one corner-cutting waterproofing member 10 in order to easily lift the corner-cutting waterproofing member 10 in a balanced manner. Furthermore, of the sides of the timber 1, the side to which the connecting plate 2 is attached may be either the downstream side 1c or the upstream side 1d, or both. Furthermore, in this embodiment, a watertight wall is constructed by stacking three corner-dropping watertight members 10, one in the lower section, one in the middle section, and one in the upper section. However, the number of corner-dropping watertight members 10 can be changed depending on the size of the corner-dropping sluice gate, etc. Furthermore, in this embodiment, the longitudinal direction of the timber 1 is the width direction of the waterway, but the longitudinal direction of the timber 1 may also be the height direction of the waterway. [Examples]

[0028] <Example 1> A corner-cutting waterproofing member 10 was manufactured with the configuration shown in Figure 1, comprising a square timber 1, a connecting plate 2, an overtightening prevention plate 5, and a hanging device 3. Of the lower, middle, and upper corner-cutting waterproofing members 10, the heaviest is the lower corner-cutting waterproofing member 10. The compressive stress σ applied to the corner timber 1 during lifting was investigated using the following calculation. The material of timber 1 has an allowable compressive stress of 5 N / mm². 2 This resulted in a long fiber reinforced resin molded body.

[0029] [FFU strength calculation] The point where the greatest load is applied during lifting is the contact point between the fasteners that secure the connecting plates and the timbers; therefore, we performed a calculation of the compressive strength of the timbers due to the fasteners. (Specifications of waterproofing material for corner cutouts) Thickness of the lumber: 166 [mm] ... (1) Height of the timber: 370 [mm]...(2) Length of lumber: 3660 [mm]...(3) Specific gravity of the lumber: 0.74 [g / cm³] 3 ]···(4) Canal width: 3400 [mm]...(5) Height of the waterproofing material for corner cuts: 1480 [mm]...(6)

[0030] (Calculation of the weight load W[N] of the waterproofing material for corner cuts) Mass of lumber (4 pieces): 665 kg (7) Mass of connecting plate (2 pieces): 42 [kg] ... (8) Weight of overtightening prevention plates (2 pieces): 22 [kg] ... (9) Mass of lifting device (2 pieces): 2 [kg] ... (10) The weight load W of the waterproofing member for corner cutouts = ((7) + (8) + (9) + (10)) × acceleration due to gravity =(665+42+22+2)×9.81 =7171[N]···(11)

[0031] (Calculation of the water pressure load P[N] applied to the waterproofing member for corner cuts) Unit volume load of water: 10.1 × 10 -6 [N / mm 3 ]···(12) The water pressure shall be borne by the entire waterproofing member for corner sealing, and the average water pressure shall be applied. Hydraulic pressure load P = ((12) × ((6) / 2)) × ((5) × (6)) ={10.1 × 10 -6 ×(1480 / 2)}×(3400×1480) =37740[N]···(13)

[0032] (Calculation of the total load Pt [N] when lifting the water-blocking member for corner collapse prevention) Assume the friction coefficient between the angle bar 1 and the water channel is 0.75. Pt = (weight load W of the water-blocking member for corner collapse prevention) + (water pressure load P) × 0.75 = (11) + (13) × 0.75 = 7171 + 37740 × 0.75 = 35476 [N] ··· (14)

[0033] (Calculation of the compressive stress σ [N / mm 2 ) When lifting the water-blocking member for corner collapse prevention, assume that one-eighth of the circumference of the hexagonal bolt threaded part of the fastener contacts the angle bar. Since the size of the hexagonal bolt is M16, the contact area is {2 × (pi) × (radius)} / 8 × (thickness of the angle bar) = (2 × π × 8) / 8 × 166 = 1043 [mm 2 ··· (15) Also, in one water-blocking member for corner collapse prevention, since there are 16 fixed points of the fastener, the compressive stress σ generated in the angle bar is σ = {(total load Pt during lifting) / (number of fasteners)} / (contact area between the angle bar and the fastener) = ((14) / 16) / (15) = 35476 / 16 / 1043 = 2.13 [N / mm 2 ··· (16)

[0034] According to the above calculation results, the compressive stress σ generated in the angle bar is 2.13 [N / mm 2 , and compared with the allowable compressive stress σa [N / mm 2 (= 5 [N / mm 2 )], it is sufficiently small, so it can be determined that there is no problem.

[0035] <Example 2> In this example, assume the mass of the water-blocking member for corner collapse prevention is 950 kg. (Calculation of the weight load W [N] of the water-blocking member for corner collapse prevention) The weight load W of the water-blocking member for corner collapse prevention = 950 × 9.81 =9320[N]···(17) (Calculation of total load Pt[N] when lifting the watertight sealing member for corner cuts) Pt = (17) + (13) × 0.75 =9320+37740×0.75 =37625[N]···(18) (Compressive stress σ[N / mm] generated in the square timber 2 Calculation of ] σ = ((18) / 16) / (15) =37625 / 16 / 1043 =2.25[N / mm 2 ]···(19) According to the calculation results above, the compressive stress σ generated in the square timber is 2.25 [N / mm²]. 2 ] and the allowable compressive stress of the square timber is σa[N / mm 2 ](=5[N / mm 2 Since it is significantly smaller than [], it can be determined that there is no problem. [Explanation of Symbols]

[0036] 1. Square timber 1a Convex stripe 1b Groove 1c Side facing downstream (downstream side) 1d Side facing upstream (upstream side) 2 Connecting plate 2a Flat plate part 2b Rising section 2c Hanging fixture mounting section 3 Hanging equipment 4. Fasteners) 5 Overtightening prevention plate 6. Handle 7. Sealing member 8 Wire rope 9 Wedge 10. Water-resistant material for corner cutouts 20. Corner drop-type sluice gate 21 Guide groove 22 Bottom member

Claims

1. Multiple pieces of timber blocking the waterway, The aforementioned plurality of square timbers are connected by connecting plates that are parallel and in a single line, The connecting plate is located on one or both of the sides of the rectangular timber facing the upstream side of the waterway and the sides facing the downstream side of the waterway. A watertight member for corner cutouts, having a suspension attachment portion on the connecting plate.

2. The corner-cutting water-blocking member according to claim 1, further comprising a fastener for fastening the square timber and the connecting plate.

3. The corner-cutting watertight member according to claim 2, wherein an overtightening prevention plate is present on the side of the square timber opposite to the side on which the connecting plate is present, and the fastener penetrates the square timber to fasten the connecting plate, the square timber, and the overtightening prevention plate.

4. The watertight corner-cutting member according to claim 1, wherein the total mass of the plurality of square timbers is 300 to 1000 kg.

5. The corner-cutting water-blocking member according to claim 1, wherein the square timber is a long fiber reinforced resin molded body.

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