JPH0629265Y2 - Reinforced plastic grating - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to gratings on the inner surface of a cave, a corrosion resistant floor, a floorboard of a sewage treatment plant, a corridor, and the like.

[Prior Art] Grating is generally formed by using steel as a material, and basically, main girders having an I-shaped cross section are arranged in parallel and a horizontal frame or a frame body is sandwiched between them to be fixed by welding. Are often seen.

For example, the steel grating in Japanese Utility Model Publication No. 59-151907, as shown in FIGS. 7A and 7B, has a slightly wide cross section I-shaped steel girder material 1 having a non-slip pattern 102 on the upper surface.
01 are laid at equal intervals in parallel, an auxiliary member 103 having a rectangular cross section is interposed between the steel girder members in parallel, and is supported by a cross girder member 104 so as to fix them to a predetermined portion. .

More specifically, in order to know an example of forming a steel grating, in FIG. A 101 is a strength member made of H-shaped steel having a welded structure having a non-slip pattern 102 on an exposed upper surface, 1
Reference numeral 03 is an auxiliary material having a rectangular cross section, 104 is a cross girder material for fixing the strength member 101 and the auxiliary material 103 to predetermined portions, 105 is a peripheral frame material, 106 is a receiving plate, 107 is a road (floor)
FIG. 2B shows that the strength member 101 has a welded structure of striped steel plates 108 and flat steel plates 109 and 109 '.

In the end, it is not suitable to combine and integrate steel materials in the form of vertical and horizontal lattices except for such welding work. Construction methods such as sheet metal pressing and punching cannot be applied to shapes that require a three-dimensional structure, and production by casting or forging simply goes against the demand for weight reduction.

Recently, along with the development of reinforced plastics (hereinafter referred to as "FRP"), attention has been paid to the fact that their lightness and corrosion resistance are extremely favorable properties for use, and they have been applied to a wide range of applications.

As the grating having FRP as a main member, it is known that it is integrally molded by a press, or that the pultruded members are assembled by using auxiliary members so as to have a constant interval.

FIG. 5 shows an integrally processed product formed by a press, and a grid-like grating is formed by a die. This point is FRP
Can be said to be an advantage over steel materials.

FIG. 6 shows an example of an assembling method, in which the I-shaped pullout material 1a is inserted into the insertion hole formed in the spacer 5 from the side in parallel and is apparently assembled in the shape of a cage.

[Problems to be solved by the invention] Steel plates are advantageous over other materials in that their unit price is relatively low, they have high strength and rigidity, and they excel in workability, especially in weldability. However, looking at the point that how the steel plate grating requires complicated manual work, the following reference example shows that (a) first, the steel girder material 101 is manufactured. For that purpose, the flat steel plate 109 is erected at a right angle on the flat steel plate 109 'and fixed by wire welding or spot welding. Then flip over and striped steel plate 1
08 (102) is welded onto the flat steel plate 109 at a right angle.

(B) The auxiliary material 103 having a rectangular cross section is fused and manufactured to a predetermined size.

(C) After the steel girder material 101 and the auxiliary material 103 are arranged at predetermined positions by the horizontal girder material 104, the three members are integrally welded.

(D) The entire circumference fixed to a desired length and width is fixed and welded by the peripheral frame member 105.

(E) The whole is placed on the receiving plate 106 and fixedly welded.

(F) Further, the receiving frame 107 for receiving the whole is laid and fixed on the road surface.

Such procedures are common sense, and in addition, careful centering and re-distortion are required for each procedure in order to make the whole structure of uniform thickness and without twisting. Must be finished by someone.

Such low productivity is an extremely unbearable task in today's extreme shortage of skilled workers.

On the other hand, when the FRP is replaced with a material, it is naturally free from complicated welding work.

However, in the case of integrally working with a press, the size thereof is restricted, and it is impossible to manufacture a product having a certain size or more. Also, considering the characteristics of the molding material, the strength is insufficient for a certain size or more, and it is difficult to put it to practical use.

On the other hand, the pultruded members have strength by themselves, but since they are arranged at regular intervals, the weight of the members increases and the economical efficiency deteriorates. In addition, there is a point that the function of transmitting the load to the adjacent members and supporting them together is lacking from the viewpoint of the assembled structure, and the limit of the concentrated load that can be endured is not high.

In order to solve the problems described above, the present invention uses FRP instead of steel, which is premised on complicated manual work, but compensates for disadvantages in strength, rigidity, and formability compared with steel by a specific configuration. The purpose of the present invention is to provide a grating having a structure in which the load is directly transferred to the whole, not less than welding fixation.

[Means for Solving the Problem] The FRP grating according to the present invention has a substantially I-shaped cross section formed by drawing an FRP material, and has a horizontal surface 13A.
13B, the back surface is upper and lower flanges 11A and 11B composed of inclined surfaces 14A and 14B, and a vertical web 1 between both flanges.
A main girder 1 made of two, and both end surfaces orthogonal to the side surface of the main girder 1 and the sloped surfaces 22A, which match the sloped surfaces 14A, 14B.
22B is provided on the upper and lower sides, and a girder body formed by connecting between them with a vertical surface 23 having the same length as the web 12 and another girder body orthogonal to the girder body are crossed vertically and horizontally at a certain distance from each other. A reinforced plastic material is press-molded and is composed of a grid body 2 that fits between a plurality of main girders 1 arranged in parallel, and is disassembled by a bolt 3 and a nut 4 on the side surface that penetrate a mounting hole formed in the web of the main girder. The above problem was solved by freely and integrally fastening.

Further, more specifically, it is also disclosed that the upper flange surface of the main girder and the upper surface of the lattice form substantially the same surface and are integrally fastened.

[Operation and Embodiment] FIG. 1 is a perspective view showing one of the most preferred embodiments of the present invention. 2 is a sectional view taken along the line AA of FIG.

In the figure, the main girder 1 having a substantially I-shaped cross section is manufactured by FRP drawing. The characteristic of the FRP formed by pultrusion is that the glass fibers contained in the plastic material, which is the base material, are forcedly aligned in the pultrusion direction, so that the FRP has a very large strength in the pultrusion direction. However, the disadvantage is that the moldability is limited only to the secondary surface, so it is suitable for long products, but other three-dimensional molding is difficult.

On the other hand, the lattice body 2 is fitted between the main girders arranged in parallel at desired intervals, and is manufactured by press molding the FRP. The characteristic of this case is that a three-dimensional molded product can be manufactured in a large amount just like a press die, but the glass fibers (glass chops) contained in the plastic solidify while maintaining non-directionality, and comparing strength and rigidity. In the axial direction, the main girder usually has a value that is 2 to 3 times that of the lattice.

The main girder 1 further comprises upper and lower flanges 11A and 11B and a vertical web 12 connecting them, and upper and lower surfaces 13A and 13B of both flanges are horizontal, but their rear surfaces 14A and 1B.
4B each form a sloped surface that is inclined toward the web.

Further, the upper surface 21 of the lattice 2 is formed as a horizontal surface, but as shown in the perspective view of FIG. 4, the side end surface orthogonal to the longitudinal side surface of the main girder 1 is slanted down and the upper and lower flange rear surfaces 14 are formed.
It is formed by the inclined surfaces 22A and 22B that are in surface contact with A and 14B and the vertical surface 23 that is in surface contact with the web 12. When the main girder and the lattice body are combined and integrally fastened, the high strength of the main girder and the load transferability of the lattice body complement each other.

That is, the line welding is not the above-mentioned line welding in the steel-based grating, but the three-sided surface contact, so that when a load is applied to the upper surface, the effective area for transmitting the load is much larger and the reliability in strength is high.

As the most desirable mode of fitting, it can be suggested that the surface 13A of the upper flange of the main girder 1 and the upper surface 21 of the lattice are substantially on the same horizontal plane, but considering the effectiveness of receiving a load, it is no longer explained. Is considered unnecessary.

In order to fasten them integrally, it is a simple means to penetrate the bolt 3 through the mounting hole 15 formed in the web 12 of the main girder and screw the bolts 3 from both sides with the nut 4. The bolts and nuts may be made of steel such as SUS304 or FRP.

FIGS. 3A and 3B are modified examples of the main girder 1, and in the case of the shape having a substantially I-shaped cross section, there may be a case where the right and left unevenness or the double web type may be adopted as shown in FIG.

[Effects of the Invention] Since the grating of the present invention has the above-described constituent effects, the main girder which can be formed into an arbitrary length and the lattice body which is manufactured in a small number are combined in an arbitrary number, and the overall length, It is possible to assemble a grating of any width and any size. In addition, since the load transmission function between the main girder and the lattice is improved regardless of the size, it has a high yield strength and is extremely advantageous in strength. On the contrary, since the lattice body is sufficient in strength to satisfy the function of transmitting the load to the main girder, it can be said that a lower quality material can be applied than the conventional one.

That is, in the present invention, the unique structure combining the difference in material strength based on the difference in the FRP forming method and the contact form of the robust pressure receiving surface with no rattling as much as the welding fixation compensate for the inferiority to the steel plate and the superiority. The effect to show is acquired.

Further, in spite of such wide versatility, the main girder and the lattice body can be easily standardized as individual members and can be suitable for mass production.

Also, since the main girder is a pultruded product with high strength, it can be used for long span applications, and since the lattice body is abutted and fitted on the main girder on three sides, there is no looseness of the member and it can be used for adjacent members under load. The transmission function of is further enhanced. Further, since the upper surfaces of both members can be formed in the same plane, the overall height can be reduced as compared with the conventional method of placing the lattice on the main girder. Further, in the case where the main girder and the lattice body are screwed together and fastened as shown in FIG. 2, it suffices to drill a hole in the center of the main girder, and the lattice body can be used as it is integrally formed, which saves time and cost. Saves money.

Further, since the grating according to the present invention can be easily disassembled into individual members even after being assembled, it can be disassembled and stored after use, and can be reassembled and reused. Even if it is unavoidable, it is possible to respond to this change urgently, and it is a characteristic completely different from the property that once manufactured it can no longer be modified.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view taken along the line AA in FIG. 1, and FIGS. 3A and 3B are sectional views showing another embodiment of the main girder. FIG. 7 is a perspective view showing only the lattice body before assembly of the embodiment, FIGS. 5 and 6 are perspective views showing different conventional techniques, and FIGS. 7A and 7B are perspective views showing still another conventional technique. And some vertical cross-sections. 1 …… Main girder, 2 …… Lattice body 3 …… Bolt, 4 …… Nut 11 …… Flange, 12 …… Web 13 …… Flange front surface 14 …… Flange back surface 15 …… Web mounting hole, 21 ...... Lattice top surface 22 …… Slope surface, 23 …… Vertical surface

Claims (2)

[Scope of utility model registration request] 1. An upper and lower flange 11A having a substantially I-shaped cross section formed by pultruding a reinforced plastic material, the front surface being horizontal surfaces 13A and 13B, and the back surface being inclined surfaces 14A and 14B.
11B and a main girder 1 formed of a vertical web 12 between both flanges, and both end surfaces orthogonal to the side surface of the main girder 1 are the inclined surfaces 1
4A and 14B are provided with upper and lower sloped surfaces 22A and 22B, and a vertical surface 23 having the same length as the web 12 is provided between them.
While a plurality of main girders 1 are arranged in parallel by press-molding a reinforced plastic material into a shape in which a girder formed by connecting with each other and another girder orthogonal to the girder intersect each other at a constant distance in the vertical and horizontal directions. A grating made of a reinforced plastic, which is composed of a lattice body 2 that fits in the main girder, and is integrally fastened by a bolt 3 and a nut 4 on a side surface that penetrate through a mounting hole formed in the web of the main girder so as to be disassembled. 2. The upper flange surface 13A of the main girder 1 and the grid 2
The reinforced plastic grating according to claim 1, wherein the upper surface 21 and the upper surface 21 form substantially the same surface and are integrally fastened together.