JP5290371B2 - Grating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grating which can be assembled without a jig, maintains the full mechanical strength of a main bar material, and improves the yield of material. <P>SOLUTION: A grating comprises: a cross bar 1 including a bar-like member 2 which has a uniform cross section in the longitudinal direction and is provided with a curved main portion 21 having an inverted U-shaped cross section with an outer collar 25 extending outward in horizontal direction from each of both the lower edges 21a thereof, the bar-like member 2 being provided with a plurality of cutout grooves 4 in vertical direction extending from the upper end part 21b of the curved main portion 21 to the outer collar 25, from which a plate-like projecting piece part 12 horizontally projects outward of a vertical face 21c in the longitudinal direction at both ends of the curved main portion 21 in the longitudinal direction; a pair of band plate-like end plates 5 which is fastened to the cross bar 1 such that plate surfaces 51 come in contact with vertical surfaces 21c at both ends of the curved main portion 21 so as to allow the width direction to be erected on both the projecting pieces 12, respectively; and a main bar 6 formed of a band plate member having a uniform cross section in the longitudinal direction and a plate thickness corresponding to the groove width of the cutout groove 4, which is fitted in the cutout grooves 4 each so as to form a grid body G with the cross bar 1, with the plate width direction being erected. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a grating that covers a top opening of a side groove or the like.

  There are two types of assembly methods for manufacturing a grating. In the first method, the main bar is erected in the width direction, a plurality of bars are arranged at a predetermined pitch, and then the cross bar is placed so as to be orthogonal to these. Next, the main bar and the cross bar are placed. In this method, a grid is formed by electric pressure welding, and side plates are fixed laterally on both sides and assembled into a grating. In the second method, a crossbar through hole is provided at substantially the center in the band width direction of the plurality of main bars, and after passing the cross bar through the through hole, the band width direction is erected and the main bar and the cross bar are It is a method of assembling into gratings so that is orthogonal. In the second method, it is necessary to form the above-described through holes having a complicated shape in each main bar, and after the cross bar is inserted into the through holes, an operation that must be erected in the band width direction is required. It was troublesome. For these reasons, an invention for solving the above problem has been proposed (for example, Patent Document 1).

JP-A-7-62717

  However, Patent Document 1 has the following new problems. First, a special jig had to be manufactured separately. Furthermore, when assembling the grating, after assembling each main bar to the dedicated jig, a cross bar was assembled to each main bar, and finally, the dedicated jig had to be removed. The burden of assembly work was forced. In addition, “a concave groove that accommodates the non-notched portion of the cross bar is formed on the lower edge of the main bar”, but it is labor intensive to cut the concave groove in the main bar having a thickness and strength. Furthermore, when manufacturing the grating, it is necessary to prepare a main bar with a concave groove for losing parts. On the other hand, the portion that was not prepared and used resulted in a decrease in the yield of the material. The main bar that was notched in the groove could not be used for another specification of grating, resulting in increased scrap scrap. Furthermore, there is a possibility that the mechanical strength as a grating is lowered and the main bar size has to be raised by one rank by cutting the groove in the main bar.

  The present invention solves the above-mentioned problems, has a structure that can be assembled without a jig and can be easily manufactured, maintains the mechanical strength of the main bar material as it is, and further improves the yield of the material. The purpose is to provide a grating.

In order to achieve the above object, the gist of the invention described in claim 1 is that a curved main portion (21) having an inverted U-shaped cross section is formed and the outer flange (21a) is horizontally extended from both lower edges (21a). 25) is a longitudinally cut cross-sectional rod-shaped member (2), and a vertical cutout groove (4) extending from the upper end portion (21b) of the curved main portion (21) to the outer casing (25). Are provided, and the portion corresponding to the outer flange (25) protrudes horizontally outward in the longitudinal direction from the vertical surfaces (21c) at both ends in the longitudinal direction related to the curved main portion (21) to form a plate-like protruding piece portion ( 12) and a metal crossbar (1) that forms a plate surface (51) abuts on both ends vertical surfaces (21c) of the curved main portion (21) and on both projecting piece portions (12). Corresponding to a pair of metal strip end plates (5) that are placed so that the plate width direction stands up and fixed to the crossbar (1) and the groove width (W4) of the notch groove (4) Band plate-like member having a plate thickness (t6), and by inserting into each notch groove (4) The crossbar (1) forms a grid-like body (G), and includes a metal main bar (6) having a cross-sectional shape in the longitudinal direction in which the plate width direction is erected. The grating is characterized in that the side plate (7) is fixed in the lateral direction on both sides of the body (G) to form a rectangular latticed board.
A grating according to a second aspect of the present invention is the grating according to the first aspect, wherein the notch grooves (4) are provided at regular intervals in the longitudinal direction of the rod-like member (2), and a groove width portion of the notch groove (4) is formed. Both ends (15) of the crossbar (1) are cut and formed leaving the part (251) of the collar (25), and the remaining part (251) of the outer collar is used as the protruding piece part (12). It is characterized by that.
The grating according to the invention of claim 3 is the invention according to claim 2, wherein a plurality of vertically long holes (30) for the notch grooves (4) elongated in the band width direction of the strip plate material are arranged at regular intervals in the longitudinal direction of the strip plate material. A perforated long material (3a) formed and formed by pressing so that both hole end portions (30a) of the longitudinally long hole (30) have uniform and smooth curved lines in plan view, Cut into the perforated strip plate material (3) according to the length (L7) of the side plate (7) and bend the cut main groove (21) and the vertically elongated hole (30) from the cutout groove (4). And a cross bar (1) produced in such a manner that both hole end portions (30a) of the vertically elongated hole (30) enter the region of the outer casing (25).

(Function)
As in the first aspect of the invention, the portion corresponding to the outer casing (25) protrudes horizontally outward in the longitudinal direction from the vertical surfaces (21c) at both ends in the longitudinal direction related to the curved main portion (21), and the plate-like projecting piece portion ( 12) forming a metal cross bar (1), and fixing both end plates to the projecting piece with the band width direction standing upright, the frame constituting the grating can be easily and accurately if there are multiple cross bars. This frame can be used as a jig for assembling the main bar as it is. If there is only one crossbar, if one side plate is fixed to the crossbar and both end plates, the frame will be the same as the above frame, and the main bar will be assembled to form a grid. . Since this grating can be made into a frame and a frame-like body using the protruding piece, the grating can be assembled without any special jig. When a plurality of vertical cutout grooves (4) extending from the upper end portion (21b) of the curved main portion (21) to the outer casing (25) are provided, a metal material such as a flat steel or a so-called I-bar has a required length. Since the strip-shaped member cut into the shape becomes a main bar without being cut or drilled, and the main bar is attached to the cross bar simply by being fitted into the notch groove from above, the manufacturing of the grating is facilitated. If the main bar is not cut out or drilled, the strength of the main bar material can be maintained as it is, and it can be used for gratings that require high strength. In addition, if there are notches or holes in the main bar, it is necessary to prepare for scraps, and if it is not prepared and used, the yield of materials will be reduced, but this main bar is made of flat steel, I-bar, etc. This can be achieved simply by cutting a general-purpose steel material at a predetermined length, thus improving the yield of the material.
As in the second aspect of the invention, both ends (15) of the crossbar (1) are cut and left, leaving the portion (251) of the outer flange (25) that forms the groove width portion of the notch groove (4). Further, if the outer flange portion (251) is the projecting piece portion (12), the projecting piece portion is formed as it is simply by cutting to the required length of the crossbar, so the crossbar is also pressed from a general-purpose material such as a steel plate. Easy to manufacture by processing alone. Excellent productivity and easy grating manufacturing.
As in the third aspect of the invention, the long hole material (3a) formed by punching so that both hole end portions (30a) of the vertically long hole (30) have a uniform and smooth curved line in plan view, respectively. ) Makes it easier to drill vertically long holes and extends the life of the punch for punching holes.

  The grating according to the present invention is easy to manufacture without requiring a jig or the like, and becomes a main bar simply by cutting the main bar material to the required length, and the material strength is maintained as it is. In addition, the thin plate cut to the required length becomes a crossbar that makes it easy to assemble the end plate only by pressing, and exhibits excellent effects such as ease of assembly and improved material yield.

In one embodiment of the grating of the present invention, (A) is a plan view of a perforated strip, (B) is a front view of a crossbar, (C) is a right side view of (B), and (D) is (A). FIG. In another embodiment of FIG. 1, (A) is a plan view of a perforated strip, (B) is a front view of a crossbar, (C) is a right side view of (B), and (D) is (A). It is an II-II arrow directional view. It is a fragmentary perspective view of a mode that an end plate is made to adhere to a cross bar. It is explanatory side view which fixes an end plate to a cross bar, (a) is explanatory drawing before fixation, (b) is explanatory drawing after fixation. It is explanatory front view which adheres an end plate to a cross bar, (a) is an explanatory view before adhering, (b) is an explanatory view after adhering. FIG. 5 is an explanatory front view after assembling the main bar after FIG. 5, (A) is an explanatory diagram before the assembly, and (B) is an explanatory diagram after the assembly. FIG. 6 is an explanatory plan view after assembling the main bar after FIG. 5. It is a top view of grating. It is the fragmentary top view which installed the grating of FIG. 8 in the receiving frame of the side groove. FIG. 10 is a view taken along the line X-X in FIG. 9. (A) is a top view of the receiving frame of the other mode which replaces FIG. 9, (b) is the XI-XI arrow directional view of (a).

  Hereinafter, the grating according to the present invention will be described in detail. FIGS. 1 to 11 show an embodiment of the grating according to the present invention. FIG. 1 is a plan view of a perforated strip plate material, (B) is a front view of a crossbar, and (C) is a right side of (B). Fig. 2 (d) is a view taken along line II of Fig. 2 (b), Fig. 2 is another embodiment of Fig. 1, Fig. 3 is a partial perspective view of fixing the end plate to the cross bar, and Fig. 4 is an end plate to the cross bar. FIG. 5 is an explanatory front view of fixing the end plate to the cross bar, FIGS. 6 and 7 are explanatory views of assembling the main bar after FIG. 5, FIG. 8 is a plan view of the grating, and FIG. 8 is a partial plan view in which the grating of FIG. 8 is installed in the receiving frame of the side groove. FIG. 10 is an enlarged view of FIG. 10, FIG. 11 is a view taken along the line XX of FIG. (B) shows a view taken along the line XI-XI in (b).

The grating P includes a cross bar 1, an end plate 5, a main bar 6, and side plates 7. The crossbar 1 cuts a steel material supplied in a flat shape such as a hot rolled steel plate or a stainless steel plate into a strip having a constant width in the longitudinal direction, and also presses the curved main portion 21 by pressing such as shearing or bending. This is a metal member provided with the outer casing 25, the bar main body 11 of the notch groove 4, and the protruding piece portion 12. An upper end of the curved main portion 21 is formed on the rod-shaped member 2 having a cross-sectional shape in the longitudinal direction in which a curved main portion 21 having an inverted U-shaped cross section is formed and an outer flange 25 is extended horizontally from both lower edges 21a. A plurality of vertical cutout grooves 4 extending from the portion 21 b to the outer casing 25 are provided in the longitudinal direction of the rod-like member 2. Further, only the portion corresponding to the outer casing 25 is extended outward in the longitudinal direction from the vertical surfaces 21 c at both ends in the longitudinal direction of the curved main portion 21, and the plate-like projecting piece portion 12 protruding horizontally is provided. The “horizontal direction” of the present invention is a plan view of the grating P arranged in a normal state. In FIG. 7, the direction parallel to the paper surface, “vertical direction” and “downward” of “both lower edges” are The vertical direction of the paper.
When the grating P is arranged in the side groove 9 in a normal state, the crossbar 1 is seen from both lower edges of the inverted U-shaped curved main portion 21 as shown in FIGS. It becomes the Ω-shape or reverse-shaped character that 鍔 25 projects. The “inverted U shape” according to the “inverted U shape curved main portion 21” of the present invention includes an Ω shape and an inverted V shape.

The cross bar 1 is manufactured as follows, for example. First, a flat steel material such as a thin stainless steel plate having a thickness of about 1.5 mm is cut into a long material having a constant width with a flat developed width S of the curved bar body 11 with respect to the longitudinal direction, and in the band width direction. A rectangular long hole 30 for the cutout groove 4 is formed at regular intervals in the longitudinal direction of the long material to form a long perforated material 3a as shown in FIG. Widthwise center deployment curved main portion 21 width S ₁ is secured, the width S ₂ for the outer flange 25 extending outwardly from the curved main lower edge 21a in the width direction on both sides can be ensured. Both ends of the longitudinal hole 30 has reached the width S ₂ region of the outer flange 25.
Next, the long perforated material 3a is cut so as to be orthogonal to the longitudinal direction of the long perforated material 3a in accordance with the lateral length L in plan view of the grating P to be produced in FIG. The perforated strip plate material 3 is cut at portions where the longitudinal elongated holes 30 are present at both ends in the longitudinal direction of the perforated long member 3a, and the protruding portions 32 for the projecting piece portions 12 present at both end portions 15 of the crossbar remain. Specifically, at the both ends in the width direction of the perforated band plate material 3, the convex portions 32 having the hole width portion 30a as one side edge so that the hole width portion 30a of the longitudinally long hole 30 remains as much as possible are provided. 3 in a state of projecting horizontally outward at both longitudinal ends. At the both ends in the longitudinal direction of the perforated strip 3 cut in the plan view lateral length L of the grating P shown in FIG. 8, the region of the longitudinally long hole 30 is cut and left as shown in FIG. Also, the convex portion 32 protrudes. Protrusions 32 protrudes in a state close to the width S _2.
Subsequently, the width S ₁ portion corresponding to the curved main portion 21 of the bore opening band plate 3, in terms of the FIG. 1 (b), a cross-sectional inverted U in the left-right direction of the center line through the width direction center At the same time as forming the curved main portion 21, the vertically long hole 30 is a cross bar 1 that becomes the notch groove 4 as shown in FIGS. Although pore width W ₃₀ of the longitudinal bore 30 is a groove width W ₄ of the notched groove 4, the groove width W ₄ is the same level as the plate thickness t ₆ of the main bar 6 (described later in detail), the main the該切Ketsumizo 4 The bar 6 can be inserted. As shown in FIGS. 1C and 1D, the cross bar 1 is a product symmetrical with respect to a vertical line passing through the upper end portion 21b of the curved main portion 21. Since both ends of the longitudinal hole 30 has reached the width S ₂ region of the outer flange 25 as described above, the notch groove 4 reaches the upper end portion 21b of the curved main portion 21 to the lower edge 21a of the curved main portion 21.
Thus, the notch groove 4 is provided in the rod-shaped member 2 having a cross-sectional shape in the longitudinal direction in which the outer casing 25 projects from both lower edges 21a of the curved main portion 21 having an inverted U-shaped section, and the rod-shaped member is further provided. A plurality of cutout grooves 4 are provided at regular intervals in the longitudinal direction of 2. Further, both end portions 15 in the longitudinal direction of the cross bar 1 are cut and formed along a line passing through the notch groove 4 except for a portion 251 of the outer collar 25 that forms a groove width portion of the notch groove 4, and the remaining outer collar 25 is left. The portion 251 becomes the protruding piece 12. The projecting piece 12 can be easily produced, and an end plate 5 described later can be mounted on the projecting piece 12 so that the end plate 5 can be easily fixed and integrated with the cross bar 1. Reference numeral 10 indicates a void formed by forming the curved main portion 21.

FIG. 2 shows a perforated strip plate material 3 and a cross bar 1 which are different from those shown in FIG. In the cross bar 1 of FIG. 2, first, a plurality of vertically elongated holes 30 for the notch grooves 4 that are vertically long in the band width direction of the strip plate material are formed at regular intervals in the longitudinal direction of the strip plate material. The long perforated material 3a as shown in FIG. 2 (a) is formed by punching so that the hole end portions 30a have a uniform and smooth curved line in plan view. A vertically long hole 30 is provided in the width direction of the long perforated material 3a with a constant hole width, but both end hole width portions 30a of the vertically long hole 30 are semicircular in plan view, unlike the one shown in FIG. Forms a smooth curve line. And Vertical All semicircular ends pore width portion 30a of the hole 30 is set so as to enter the width S ₂ region of the outer flange 25. Next, the long perforated material 3a is cut at the portion of the vertically long hole 30 so as to match the horizontal length L of the grating P to be produced in FIG. 8 in plan view, in other words, the length L7 of the side plate 7. The twelve convex portions 32 are provided to form the perforated belt plate material 3. Further, the curved portion 21 is formed by bending. With this formation, the cutout groove 4 is produced from the vertically long hole 30, and the curved hole width both end portions 30 a of the vertically long hole 30 enter the region of the outer casing 25. I am doing so. Reference numeral 39 denotes a portion obtained by trimming and cutting the curved line portions of the crossbar both end portions 15 remaining after being cut transversely from the perforated strip plate material 3 through the portion of the vertically long hole 30.
When the perforated strip plate material 3 of FIG. 2 (a) is changed to the crossbar 1 of FIGS. 2 (b) to (c), the vertically long hole 30 extends from the upper end portion 21b of the curved main portion 21 to the lower edge 21a of the curved main portion 21. All the groove end portions 45 that are at least semicircular in plan view enter the region of the outer collar 25. As with the cross bar 1 in FIG. 1, the long perforated material 3 a is cut to the same length or slightly shorter according to the length L 7 of the side plate 7, so that the cross bar 1 can be formed. Both ends 15 of the cross bar 1 are cut and formed so that the portion 251 of the outer flange 25 that forms the groove width portion of the notch groove 4 remains, and the remaining portion 251 of the outer flange 25 becomes the projecting piece portion 12. .

The end plate 5 is formed by cutting a general-purpose material such as a rolled steel material or stainless steel material having a cross-sectional shape in the longitudinal direction, such as a so-called I-bar or flat steel, according to the vertical length B in plan view of the grating P to be produced in FIG. This is a band plate member. When the general-purpose material is cut at a predetermined position so as to be orthogonal to the longitudinal direction, a strip-shaped end plate 5 is formed. The end plate 5 of the present embodiment uses an I-bar and has the same shape as a main bar 6 described later, but each figure schematically shows the I-bar shape. This end plate 5 is used for the grating P with the band width direction standing upright, but it is also possible to provide an anti-slip uneven portion on the upper plate thickness surface 55.
The plate surfaces 51 are brought into contact with both end vertical surfaces 21c of the curved main portion 21 in which two end plates 5 are connected in series, and are placed on both projecting piece portions 12 so that the plate width direction stands up. It is fixed to the bar 1. In the present grating P, as shown in FIG. 8, two crossbars 1 are arranged in parallel in the width direction at intervals. The end plates 5 are placed on the projecting piece portions 12 protruding at the longitudinal end portions 15 of the crossbars 1 so that the end plates 5 are raised in the plate width direction (FIGS. 4 and 5). The plate surface 51 is brought into contact with the vertical surfaces 21c at both ends in the longitudinal direction (FIG. 3), and is fixedly integrated with the protruding piece 12 (or the vertical surface 21c). By fixing and integrating the end plate 5 and the crossbar 1, a frame body F having a horizontally long square shape as shown in FIG. 7 is formed.
The band width of the end plate 5 here is set larger than the height of the curved main portion 21. Therefore, when the frame body F in which the end plate 5 is fixedly integrated on the projecting piece 12 of the crossbar 1 is completed, the upper end of the curved main portion 21 is obtained as shown in FIGS. 4 (B) and 5 (B). The plate thickness surface 55 on the upper side, which is the upper end surface of the end plate 5, slightly protrudes upward from the portion 21b.

The main bar 6 is a strip-like member having a plate thickness t ₆ corresponding to the groove width W ₄ of the notch groove 4, and is fitted into each notch groove 4 to form the grid-like body G with the cross bar 1. It is a main member of the grating P to be formed. Since the main bar 6 mainly receives and supports the load applied to the grating P when the vehicle is traveling, the main bar 6 is made of rolled steel having a longitudinal cross-sectional shape such as I-bar or flat steel having high mechanical strength, stainless steel, etc. General-purpose materials such as steel are used. The main bar 6 of the present embodiment is a strip-like member cut at a length matching the vertical length B of the grating P to be produced in FIG. 8, and has the same shape as the end plate 5 as described above. is there. The main bar 6 is fitted into the respective cutout grooves 4 in the crossbar 1 to form a grid G having slits SL with the crossbar 1. Here, the main bar 6 is erected in the notch grooves 4 of the two crossbars 1 constituting the frame body F so that the plate width direction is erected as shown by the black arrows in FIGS. It is attached to the body F. After fitting each main bar 6 into the notch groove 4, both ends of the main bar 6 are spot-welded to the side plate 7, and integration as the grating P is achieved.
The band width of the main bar 6 is set to be larger than the height of the curved main portion 21 as with the end plate 5. When each main bar 6 is fitted into the cutout groove 4 and is fixedly integrated on the outer flange 25 of the crossbar 1 to form a lattice-like body G, as shown in FIG. 6 (b), the upper end portion 21b of the curved main portion 21 is obtained. The upper plate thickness surface 65, which is the upper end surface of each main bar 6, protrudes slightly upward. Since the main bar 6 is also fitted into the notch groove 4 and stands on the outer casing 25, the upper end surface 65 of each main bar 6 and the upper end surface 55 of the end plate 5 are flush with each other.

  The side plate 7 is a metal strip material having a longitudinal length L of the grating P to be produced in FIG. The band width of the side plate 7 here is substantially the same as the band width of the main bar 6 and the end plate 5. The side plates 7 are fixed in the lateral direction on both sides of the lattice-like body G. For example, after the main bar 6 is inserted into the notch groove 4 of the cross bar 1 incorporated in the frame body F as shown in FIG. By fixing 7, a desired grating P can be obtained (FIG. 8). Both sides in the longitudinal direction of the lattice-like body G are closed by the side plates 7 and become a grating P of a rectangular lattice-like board.

Next, a manufacturing method of the grating P using the cross bar 1, the end plate 5, the main bar 6, and the side plate 7 will be described.
First, a plurality (two in this case) of crossbars 1 are arranged in parallel on a table or the like. Subsequently, the end plates 5 are placed on the respective projecting piece portions 12 at the longitudinal end portions 15 of the crossbar 1 so as to change from the solid line position of FIG. 3 to the chain line position. After placing the end plate 5, the lengths of both end portions 53, 54 that stand up in the direction of the strip and project outward from the two cross bars 1 are made equal. A plate thickness surface 56 on the lower side of the end plate 5 is brought into contact with the projecting piece portion 12, and a plate surface 51 of the end plate 5 is brought into contact with both end vertical surfaces 21 c of the curved main portion 21 related to the crossbar 1. Instead of moving the end plate 5 horizontally in the horizontal direction as shown in FIG. 3, the end plate 5 is projected from above to the two cross bars 1 arranged horizontally as indicated by the white arrows in FIG. The protrusion 12 and the plate thickness surface 56 on the lower side of the end plate 5 are brought into contact with each other, and the both-end vertical surface 21c related to the curved main portion 21 of the crossbar 1 and the plate surface 51 of the end plate 5 are contacted. May be brought into contact with each other. Further, the two end plates 5 are spaced apart from each other so that the lateral length L of the grating P shown in FIG. 8 is maintained, and the band width direction is erected, and the lower plate thickness surface 56 is on the upper side. After being arranged in parallel, the two crossbars 1 are kept parallel from above and lowered with the inverted U-shaped upper end portion 21b side of the curved main portion 21 down, and the projecting piece 12 is placed on the end plate 5 While being placed, both end vertical surfaces 21 c of the curved main portion 21 and the plate surface 51 of the end plate 5 may be brought into contact with each other.
Thereafter, the contact portion is fixed by welding or the like to obtain a frame F having a horizontally long square shape as shown in FIG. The cross bar 1 and the end plate 5 that are the frame F are disposed at the positions where the grating P, which is the final product, is disposed.

Subsequently, as shown in FIGS. 6 and 7, the frame body F is horizontally arranged so that the upper end portion 21 b side of the curved main portion 21 is on the upper side, and then the plate width direction of the main bar 6 is raised. The main bar 6 is inserted into each notch groove 4 and formed into a lattice-like body G with the cross bar 1. Since each notch groove 4 is stably held by the frame body F, the lattice-like body G can be formed smoothly, and the frame body F also serves as a jig of Patent Document 1.
Finally, the end faces 61 and 62 of the main bar 6 made into a grid-like body G are aligned, and the side plates 7 are fixed in the lateral direction on both sides of the grid-like body G, and the grating of the rectangular grid board as shown in FIGS. P. Each main bar 6 is fixed to the side plate 7 by spot welding.
Here, after the frame F is formed, the one side plate 7 is moved in the direction of the white arrow in FIG. It is more preferable that the first side end face 58 is bonded and fixed in advance as shown by a chain line in FIG. The main bar 6 is erected and inserted into the respective cutout grooves 4 to form a lattice-like body G with the crossbar 1. After the insertion, in FIG. 7, when the one end surface 61 of each main bar 6 is applied to the other end plate 62, the other end surface 62 is automatically flush with the side end surfaces 57 of the both end plates 5. This is because the desired grating P can be obtained by adhering to.

  Although not shown, in the case of the grating P having only one cross bar 1, the cross bar 1, the both end plates 5 and the one side plate 7 form a horizontally long rectangular frame-like body in place of FIG. More preferably. This is because the frame-like body plays the role of a jig, and the fitting and setting of the main bar 6 into the notch groove 4 proceeds smoothly as with the frame F.

The grating P configured as described above forms a frame body F that constitutes the grating P when the end plates 5 are erected and fixed to the protruding pieces 12 of the crossbar 1 respectively. In general, the crossbar 1 is usually provided in a plurality of two or more, and two projecting pieces 12 are horizontally formed at both ends of each crossbar 1 in the longitudinal direction. Since the projecting piece portion 12 protrudes horizontally outward in the longitudinal direction from both end vertical surfaces 21c of the curved main portion 21, the plate thickness surface 56 on the lower side of the end plate 5 is brought into contact with the projecting piece portion 12 to end the projecting piece portion 12. It becomes easy to make the plate 5 stand up stably and to bring the plate surface 51 into contact with both end vertical surfaces 21c of the curved main portion 21 related to the cross bar 1. By setting and fixing the crossbar 1 and the both end plates 5, a frame F having a horizontally long rectangular shape in plan view as shown in FIG. 7 can be easily formed.
The main body 6 and the side plate 7 can be assembled and integrated using this frame F. Without preparing a special jig or the like separately, the main bar 6 is sequentially inserted into each notch groove 4 of the cross bar 1 constituting the frame F to form the grid G with the cross bar 1, and then the grid shape If the side plates 7 are fixed in the lateral direction on both sides of the body G, the grating P of the rectangular grid-like disk body is completed as it is. In manufacturing the grating P, as in Patent Document 1, after assembling each main bar 6 to the dedicated jig, the crossbar 1 is assembled to each main bar 6, and finally, the dedicated jig is attached again. There is no labor that must be removed. Since the frame F itself serves as a dedicated jig and is a part of the grating P, there is no waste in assembling the grating. Even when there is only one cross bar 1, if the cross bar 1, the end plates 5, and the one side plate 7 form a horizontally-long rectangular frame, the same effect as the frame F can be obtained.

Further, in Patent Document 1, “a concave groove for accommodating a non-cut portion of the cross bar is formed at the lower edge of the main bar”, and it is an effort to cut the concave groove into the main bar 6 having a thickness and strength. Although it was a heavy burden, it is not forced to bear such a burden. The main bar 6 of the present invention is a general-purpose material such as an I-bar or flat steel, which is aligned with the longitudinal length B of the grating P to be produced in FIG. It can be done by simply cutting to be orthogonal to
Furthermore, when notching a concave groove as in Patent Document 1, it is necessary to prepare a damaged portion of the main bar 6, while the portion that was not prepared and used has led to a decrease in the yield of the material. There is no such waste. Unlike the prior art, the main bar 6 is only cut from a general-purpose material according to the required number, and the yield of the material is improved. Even if the main bar 6 is insufficient, it can be simply prepared from a general-purpose material and can be prepared immediately.

  Furthermore, there was a risk that the mechanical strength of the grating P would be reduced by cutting the concave grooves in the main bar 6 and the size of the main bar 6 would have to be raised by one rank. To do. In the second method of the background art, there is no need to form a through hole having a complicated shape in the main bar 6, and the notch processing of the concave groove of Patent Document 1 is not required, and general-purpose materials such as I-bar and flat steel are used. Since what is cut | disconnected so that it may orthogonally cross with respect to the longitudinal direction is used, the mechanical strength of the material for main bars 6 can be utilized as it is.

  On the other hand, the protruding piece 12 of the cross bar 1 is attached to the grating P on the plate thickness surface 56 on the lower side of the end plate as shown in FIG. 11 (B), and is placed on the receiving frame 8 of the side groove 9. At first glance it seems difficult. However, as shown in FIGS. 9 and 10, the side frame portion 81 placed on the stepped portion 91 a along the flow path 90 of the side groove 9 is made into a general-purpose type cross-sectional L-shaped member composed of the upright plate portion 810 and the bottom plate portion 811. The end frame portions 82 at both ends in the longitudinal direction can be solved without difficulty by adopting the receiving frame 8 made of only the upright plate portion 820 as a flat steel. The end frame portions 82 at both ends in the longitudinal direction can be sufficiently strong even with flat steel. Further, when the receiving frame 8 is a general-purpose type cross-sectional L-shaped member made up of the side frame portion 81 and the end frame portion 82 as shown in FIG. 11, the end frame portion 82 of the receiving frame 8 to which the projecting piece 12 hits is as shown in the figure. There is no problem if the step 82a is provided. In the figure, reference numeral 91 denotes a side wall portion of the side groove, reference numeral 92 denotes a side groove upper surface aligned with the road surface, and reference numeral 83 denotes an anchor.

  As described above, the main bar 6 does not have a complicated-shaped through-hole called a butterfly hole in the second method of the background art, or a notch in the concave groove of Patent Document 1, so that it accompanies a cross-sectional defect of the main bar 6. There is no drop in strength. It becomes possible to meet the specifications of the main bar 6 of the grating P currently distributed in the second method with a small lightweight main bar 6 one rank below. Moreover, although the said ditch | groove and a through-hole are formed by cutting, drilling etc., and a main bar is a thick-walled shape with high intensity | strength, it is dangerous for an operator, Such work risk can be avoided. The main bar 6 only cuts a general-purpose material such as an I-bar by a predetermined length, and can eliminate a processing step such as a notch of a concave groove. You don't even need to pay off the prospects. Reducing the amount of scrap scrap of the main bar 6 material (general-purpose material), especially high-priced stainless steel material, will greatly promote the cost reduction of the grating. The cost of the grating product can be reduced by improving both the material yield and the manufacturing method.

  Further, although a thin plate material is used for the cross bar 1, since the curved main portion 21 is provided, the strength of the cross bar 1 is sufficiently secured. Since a thin plate material such as a steel plate can be used for the cross bar 1, the weight can be reduced. Then, the upper end portion 21b of the curved main portion 21 is formed on the rod-shaped member 2 having a cross-sectional shape in the longitudinal direction in which the curved main portion 21 having an inverted U-shaped cross section is formed and the outer flange 25 is extended from both lower edges 21a. Since the notch grooves 4 for the main bar 6 extending from the outer flange 25 to the outer flange 25 are provided at regular intervals in the longitudinal direction, the pitch between the main bars 6 is reliably maintained, and the fall and twist of the main bar 6 can be prevented by the cross bar 1.

  Furthermore, if the cross bar 1 is processed with the perforated long material 3a, when the cross bar 1 is cut at a portion where the vertically long hole 30 is present, the projecting portion 32 that becomes the projecting piece portion 12 remains, so that the perforated strip plate material 3 remains. After that, the desired crossbar 1 can be completed simply by forming the curved main portion 21 by bending. Like the main bar 6, the cross bar 1 is easy to manufacture and is not wasteful.

In addition, the long perforated material 3a formed by punching so that both hole end portions 30a of the vertically long holes 30 have a uniform and smooth curved line in plan view is matched with the length L7 of the side plate 7. When the cut groove 4 is produced from the curved main portion 21 and the vertically long hole 30 by cutting and bending, both end portions 30a of the vertically long hole 30 are uniform and smooth in a plan view as shown in FIG. Since it is a curved line, workability can be improved and the life of the punch for punching can be extended. Excellent effect from the viewpoint of equipment.
As described above, the grating P exhibits the above-described effects and is extremely useful.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. Crossbar 1, mesh member 2, notch groove 4, end plate 5, main bar 6, side plate 7, receiving frame 8, side groove 9, grid body G, frame F, etc., shape, size, number, material, material, etc. Can be appropriately selected according to the application.

DESCRIPTION OF SYMBOLS 1 Crossbar 12 Protruding piece part 15 Both ends 2 Bar-shaped member 21 Curved main part 21a Lower edge 21b Upper end part 21c Vertical surface 25 Outer flange 251 Part of outer casing which forms groove width 3 Perforated belt plate material 3a Perforated long material 30 Vertically long hole 30a Both hole end part (hole width both end part)
4 notch groove 5 end plate 51 plate surface 6 main bar 7 side plate t ₆ plate thickness (main bar plate thickness)
G Lattice L7 Side plate length P Grating W ₄ groove width

Claims (3)

A rod-shaped member (2) having an equal cross-sectional shape in the longitudinal direction, in which a curved main portion (21) having an inverted U-shaped cross section is formed and an outer casing (25) is extended horizontally from both lower edges (21a) A plurality of vertical cutout grooves (4) extending from the upper end portion (21b) of the curved main portion (21) to the outer casing (25) are provided, and the portion corresponding to the outer casing (25) is the curved main section. A metal crossbar (1) that horizontally protrudes outward in the longitudinal direction from the vertical surfaces (21c) at both ends in the longitudinal direction according to the portion (21) to form a plate-shaped projecting piece portion (12),
A plate surface (51) is brought into contact with the vertical surfaces (21c) at both ends of the curved main portion (21), and is placed on the projecting piece portions (12) so that the plate width direction stands up. A pair of metal strip end plates (5) secured to the bar (1);
A strip-shaped member having a plate thickness (t6) corresponding to the groove width (W4) of the notch groove (4), and the crossbar (1) by being fitted into the notch groove (4). Forming a grid-like body (G) and having a metal main bar (6) having an equal cross-sectional shape in the longitudinal direction in which the plate width direction is erected, and further laterally on both sides of the grid-like body (G) Grating characterized in that the side plate (7) is fixed in the direction to form a rectangular latticed board. The notch grooves (4) are provided at regular intervals in the longitudinal direction of the rod-shaped member (2), and the outer flange (25) part (251) for forming the groove width part of the notch groove (4) is left. The grating according to claim 1, wherein both ends (15) of the cross bar (1) are cut and formed, and the remaining outer flange portion (251) is used as the protruding piece portion (12). A plurality of vertically elongated holes (30) for the notch grooves (4) that are vertically long in the band width direction of the strip plate material are formed at regular intervals in the longitudinal direction of the strip plate material, and both hole ends of the vertically long holes (30) The perforated long material (3a) formed by punching so that the part (30a) is a uniform and smooth curved line in plan view is matched with the length (L7) of the side plate (7). Cut into the perforated strip plate material (3) and the crossbar (1) in which the curved main portion (21) and the longitudinally elongated hole (30) were used to produce the cutout groove (4) by bending, and the longitudinally long 3. The grating according to claim 2, wherein both hole end portions (30a) of the hole (30) enter the region of the outer casing (25).

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