JP7182292B2 - grating - Google Patents

Description

TECHNICAL FIELD The present invention relates to a floor panel for a clean room, a grating for covering an upper surface opening of a drain, or the like.

For example, in recent years, the gap between gratings used to cover the upper openings of drains tends to become narrower to improve the appearance and prevent high heels from entering. Along with this, the pitch between the main members is becoming smaller, and the number of main members to be incorporated into one grating is increasing. Since the grating m is welded to the side plate 8 at both ends of the main member f (FIG. 14), the number of welding points 9 is doubled as the number of main members increases. The burden on welding workers is increasing.
For this reason, several inventions for improving gratings have been proposed (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2001-227051

However, as described in claim 1 of Patent Document 1, "...a group of bearing bars in which connecting and locking pieces with lock holes are provided at both ends of the belt material, and the connecting and locking pieces are provided. a side frame member for combining bearing bar groups with bearing bar connecting holes juxtaposed in side plates through which said lock holes protrude; It is a grating characterized by a structure that locks into place.”, and although it can be done without the burden of welding, the burden of other work is large, increasing the cost.
The bearing bar (which corresponds to the main member of the present invention) is made sturdy for the load-bearing member. It is difficult to process the connecting locking pieces with locking holes on both ends of all the bearing bars, resulting in an increase in cost. In addition, it is difficult to prevent rattling without increasing the dimensional accuracy of the connecting locking piece and the bearing bar connecting hole provided side by side in the side plate.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to provide a grating that achieves quality assurance and cost reduction while greatly reducing the number of welding points even if the number of main members to be incorporated increases. .

In order to achieve the above object, the gist of the invention as set forth in claim 1 is to provide a plurality of strip plate-shaped main members which are provided with through holes at both end portions and are arranged upright in the strip width direction, and a strip width of the strip plate. A perforated plate in which a plurality of long holes whose long sides are in the band width direction of the band-shaped plate are provided at a predetermined pitch in the longitudinal direction at the center portion except for both sides in the direction, and the perforated plate bends in a cross section ⊃ shape, and the center The portion is formed into a bent portion with the elongated hole as a comb tooth-shaped concave groove in plan view, and the both side portions are bent at the upper and lower tip portions of the bent portion with a ⊃ cross section, and the upper and lower sides are bent. A pair of intermediary members formed on the outer flanges extending to the sides, respectively; , the bent portion related to the side edge member with the pair of mediation members projecting outward from the side edge member by locking the outer flange to the bent end portion in the space of the U-shaped processed portion; sandwiches a plurality of the main members, and both end portions of each main member are fitted into the respective concave grooves, and through-holes are arranged to pass through the group of through-holes that are accommodated in the cross-sectional triangular portion of the bent portion. a rod, and welding the intermediate member and the side edge member related to the side edge member with the intermediate member where the bent portion projects outward from the side edge member; Among the main members, the outermost one end side and the other end side main members are formed with welded portions for joining the main members and the through rods, and are integrated into a rectangular shape in plan view. A grating characterized by:
In the grating according to the invention of claim 2, in claim 1, in order to weld and join the intermediate member and the side edge member related to the side edge member with the intermediate member, one end of the side edge member with the intermediate member or The intermediate member and the side edge member are welded together at both ends . In the grating according to claim 3, in claim 1 or 2 , instead of welding the intermediate member and the side edge member related to the side edge member with the intermediate member, the U-shaped processed part is In the space, the back of the outer collar engaged with the bent end portion and the inner wall surface of the U-shaped processed portion are brought into contact with each other, and the filler is inserted into the space of the U-shaped processed portion. It is characterized by further comprising a body.

(Action)
As in the invention of claim 1, when both end portions of the main member sandwiched between the bent portions projecting outward from the pair of side edge members respectively fit into the grooves, the main member is fitted into the respective grooves. The main members can be arranged at a predetermined pitch. Since the intermediary member is formed in the bent portion and the opening of the recessed groove having a comb tooth shape in plan view is open, the main member can be smoothly fitted in compared with the bearing bar connecting hole of Patent Document 1. When a through-bar is arranged to pass through the group of through-holes that are accommodated in the cross-sectional ⊃-shaped portion of the bent portion, it is not necessary to provide a protruding connection locking piece provided with a lock hole as in Patent Document 1. . The main member only needs to be provided with through holes at both end portions.
According to the first aspect of the present invention, the side edge member with the intermediary member is in the state of the bent portion projecting outward from the side edge member by locking the outer flange to the bent end portion in the U-shaped processed portion. For example, if the intermediate member and the side edge member are welded at one end or both ends of the two, they are integrated. Then, a through-rod penetrating through a group of through-holes contained in the cross-section ⊃-shaped portion is welded to the outermost main member at two points on both ends of the through-rod, thereby forming each main member. The through-bar stops the movement of each main member from the concave groove and integrates with the bent portion of the intermediate member. In addition, if the welding is added at the two ends of the side edge member and the intermediate member, the side edge member is also integrated, and the main member, the intermediate member, and the side edge member constituting the grating are all integrated. can be

Since the grating of the present invention is provided with an intermediary member that connects the main member and the side edge member, even if the number of main members incorporated in the grating increases, the number of welded portions can be minimized, and the welding work can be simplified. It has great effects such as lightening the burden, ensuring stable quality, and realizing cost reduction.

2 is a plan view of the grating of Embodiment 1. FIG. It is a top view of a perforated plate. It is a partial perspective view of an intermediate member. It is explanatory sectional drawing which incorporates a main member in a concave groove. FIG. 5 is an explanatory cross-sectional view in which the main member of FIG. 4 is fitted into a concave groove; FIG. 2 is an explanatory perspective view showing a through-bar passing through a group of through-holes in the VI-VI line cross-section of FIG. 1 ; (a) is a side view of the short side of the rectangular grating in FIG. 1, and (b) is a perspective view of the stuffing and the end of the grating. It is an explanatory plan view in which the present gratings are arranged in a row. FIG. 10 is a partial perspective view of the grating of Embodiment 2 using an I-bar, and is a reference view . FIG. 10 is a sectional view corresponding to FIG. 4 in the grating of FIG. 9; FIG. 10 is a sectional view corresponding to FIG. 5 in the grating of FIG. 9; FIG. 11 is a partial perspective view of the grating of Embodiment 3 using T-bars; FIG. 13 is a cross-sectional view of the T-bar head of FIG. 12 placed on and locked to the cross-sectional ⊃-shaped portion of the bent portion; 1 is an explanatory plan view of a prior art grating; FIG.

The grating according to the present invention will be described in detail below.
1 is a plan view of the grating of Embodiment 1, FIG. 2 is a plan view of the perforated plate, FIG. 3 is a perspective view of the intermediate member, FIG. FIG. 6 is an explanatory perspective view of passing through a group of through-holes through the main member, FIG. 7 is a side view of the short side of the grating, and FIG. 8 is a plan view of a series of gratings, FIG. 9 is a partial perspective view of the grating of Embodiment 2 and is a reference drawing , FIG. 10 is a cross-sectional view of the grating of FIG. 9 corresponding to FIG. 11 is a cross-sectional view of the grating of FIG. 9 corresponding to FIG. 5, FIG. 12 is a partial perspective view of the grating of Embodiment 3, and FIG. shows a cross-sectional view in which it is placed on and locked. In each figure, the essential parts are emphasized for easy understanding, and the parts not directly related to the present invention are omitted.

(1) Embodiment 1

The grating 1 comprises a plurality of main members 2, a pair of intermediate members 3, a pair of side edge members 5, and a pair of through rods 6 (FIGS. 1-13). Here, it is applied to the grating 1 that covers the drain D of the kitchen floor S.

The main member 2 is a stainless steel (or carbon steel, etc.) strip plate-shaped metal work product, and through holes 25 are provided at both end portions 29 . The main member 2 shown in FIGS. 1 to 8 is provided with a flat bar 2A having an equal cross-sectional shape in the longitudinal direction and having a through hole 25 penetrating through the plate surface at the center of both end portions 29 in the band width direction. The main member 2 has a length matching the groove width so as to straddle the drainage groove D, and is erected in the band width direction. The main member 2 is a plurality of gratings 1 arranged at a predetermined pitch in the longitudinal direction of the drainage groove D, and when the drainage groove D is covered, each main member 2 receives the load from above the groove opening. becomes the main part of (Fig. 7). Therefore, it is also called a bearing bar or a main bar.
The strip-like main members 2 are assembled in the grating 1 by arranging them in parallel while ensuring a gap ε between the main members 2 adjacent to each other, with the width direction of the strip being vertical. Here, when arranged in parallel, the I bar 2B in FIG. 9 is thicker at the upper and lower ends than the middle part, the T bar 2C in FIG. A so-called "seven bar" can also be used as the main member 2 of the present invention if through holes 25 are provided at both end portions 29 of the strip shape in the longitudinal direction.

The intermediary member 3 is a long bent product having a bent portion 31 and an outer collar 35, and is provided as a pair (FIG. 3). The perforated plate 4 shown in FIG. 2, in which a plurality of long holes 410 with the long side 4101 of the hole extending in the width direction of the strip plate are provided at a predetermined pitch in the longitudinal direction, straddles the drainage groove D with the grating 1 and covers it. In the side view of (a), the bent portion 31 is formed so as to be curved in a ⊃ shape in cross section, and the elongated hole 410 is formed into a concave groove 310 having a comb tooth shape in a plan view. Further, the upper and lower tip portions 45 of the bent portion 31 having a ⊃ cross section are bent to form outer flanges 35 extending upward and downward, respectively. Intermediate members 3 are interposed between the main members 2 and the side edge members 5 to connect them. It should be noted that, in the side view of FIG. 7(a), as described above, the bent portion is bent in a ⊃ shape in cross section, but the "⊃ shape" in the present invention includes the ">shape". As with the bent portion 31 having a ⊃-shaped cross section, the end portion of the main member 2 can be inserted into the recessed groove 310 of the bent portion 31 having a >-shaped cross section, and the through hole 25 can be accommodated in the >-shaped cross section. Because you can.
The intermediate member 3 is manufactured, for example, as follows.

First, a perforated plate 4 is formed in which a plurality of long holes 410 whose long sides 4101 are in the width direction are provided at a predetermined pitch in the longitudinal direction in the central portion 41 of the belt plate while leaving both side portions 45 in the width direction. (Figure 2). The both side portions 45 are tip portions of the bent portion 31 for the outer collar 35 in terms of zones in the band width direction. The distance P between adjacent long holes 410 is the width of the gap ε. Next, the central portion 41 of the perforated plate 4 is bent in a cross section ⊃ shape at the central center horizontal line portion of FIG. Further, both side portions 45 are bent at the upper and lower tip portions of the bent portion 31 having a ⊃ cross section, respectively, and are formed into outer flanges 35 extending upward and downward, respectively, as shown in FIG. Intermediate member 3 is formed. Here, the terms "upper" and "lower" in the present invention refer to the upward direction and the downward direction in the plane of the paper in the state of the grating 1 in FIG.
The grating 1 is assembled by fitting the main member 2 from the groove mouth into the groove 310 of the intermediary member 3 incorporated in the side edge member 5 (FIGS. 4 and 5). In this assembly, the position of the groove bottom of the recessed groove 310 is determined so that the side end surface 291 of the main member 2 can come into contact with the later-described bent end portion 55 of the side edge member 5 . The groove bottom may be arranged in the region of the outer flange 35, but the groove short side 3102, which is the groove bottom of the recessed groove 310 having a comb tooth shape in plan view as shown in FIGS. preferably set. This is because the required strength of the intermediate member 3 can be easily obtained. The length W of the hole short side 4102 forming the long hole 410 is matched with the thickness of the main member 2 so that the main portion 21 of the main member 2 can be fitted into the groove 310 .
The outer collar 35 is engaged with the bent end portion 55 to be housed in the U-shaped space 51S, and the bent portion 31 projects outward from the side edge member 5, specifically toward the center of the drainage groove D. Then, the intermediary member 3 is assembled to the side edge member 5 .

The side edge member 5 is a metal processed member having an equal cross-sectional shape in the longitudinal direction formed into a processed portion 51 having a U-shaped cross section and bent end portions 55 which are bent at both ends thereof to face each other. In this embodiment, the standing wall portion 511 of the U-shaped processed portion 51 substantially matches the cross-sectional height (band width direction length) of the main member 2 . The horizontal portion 512 is bent at approximately right angles from the upper and lower ends of the standing wall portion 511 and extends to form a U-shape. The side edge member 5 has an extended bent end portion 55 . Then, the outer flange 35 of the intermediate member 3 is engaged with the bent end portion 55 in the space 51S of the U-shaped processed portion 51, and the bent portion 31 passes through the opening between the bent end portions 55, 55 and is The side edge member 5 can be projected outside the character-shaped space 51S. The intermediary member 3 is formed by inserting the portion of the outer flange 35 into the U-shaped space 51S of the side edge member 5 shown in FIG. Lock.

In this embodiment, the U-shaped space 51S is made large in order to improve workability when locking the outer collar 35 to the bent end portion 55. As shown in FIG. Therefore, the intermediate member 3 and the side edge member 5 are welded together at both ends in the longitudinal direction so that the intermediate member 3 and the side edge member 5 do not rattle (FIG. 7A). Reference numeral 9 indicates a welded portion. FIG. 7(a) is a side view of the short side of the rectangular grating 1 of FIG. part appears. Since the grating 1 is provided with a pair of side edge members 5 with intermediate members 3 sandwiching each main member 2, a total of four portions are welded together as shown in FIG. In the case of the rectangular grating 1 shown in FIG. 1, the intermediate member 3 and the side edge member 5 are welded together at four corners. For example, the grating 1 may be welded at two locations on the lower left and right sides. By the welding connection, the side edge member 5 with the intermediate member 3 is integrated.

Instead of welding the end portions of the intermediary member 3 and the end portions of the side edge member 5, the intermediary member 3 may be fixed to the side edge member 5 with a stuffing member 7 as shown in FIG. 7(b). The padding body 7 is inserted into the space 51S of the U-shaped processed portion 51 so that the rear surface 35b of the outer collar 35 engaged with the bent end portion 55 and the inner wall surface 51b of the U-shaped processed portion 51 are brought into contact with each other. be worn. The stuffing body 7 has a wedge shape as shown in the drawing, and is tapered toward the tip so as to be accommodated in the space 51S of the U-shaped processed portion 51. Then, the stuffing body 7 is inserted into the space 51S of the U-shaped processed portion 51 and pressed against the inner wall surface 51b of the U-shaped processed portion 51 and the outer flange rear surface 35b.

The through rod 6 is a long shaft-like member having substantially the same length as the intermediate member 3 and the side edge member 5 . A through-bar 6 is inserted into a group of through-holes 25 after a plurality of main members 2, a pair of intermediate members 3, and a pair of side edge members 5 which constitute the grating 1 are assembled (FIG. 6).
Intermediate members projecting outward from the pair of side edge members 5, i.e., toward the center of the drainage groove D, respectively, by locking the outer collar 35 to the bent end portion 55 in the space 51S of the U-shaped processed portion 51. 3 bent portions 31 sandwich each main member 2 , and both end portions 29 of each main member 2 are fitted into respective concave grooves 310 . Both end portions 29 of the main member 2 are fitted into the grooves 310, respectively, and the through holes 25 accommodated in the cross-section ⊃-shaped portion 31U of the bent portion 31 are arranged in the direction perpendicular to the plane of FIG. be done. A through-bar 6 is arranged to pass through the group of through-holes 25 . When the through-bar 6 is arranged to pass through the group of through-holes 25, each main member 2 having the through-holes 25 is bent by the bent portion 31 and the bent end portion 55, which accommodates the through-holes 25 in the ⊃-shaped portion 31U. on the paper and in the horizontal direction are restricted.

On both sides of the group of main members 2, the through rods 6 are inserted through the groups of through-holes 25 that are accommodated in the cross-sectional ⊃-shaped portions 31U of the bent portions 31 related to the side edge members 5 with the intermediate member 3. Then, only the outermost main member 2α among the plurality of arranged main members 2α is welded to the through rod 6 at the portion 292 of the main member 2 around the through hole 25 (FIG. 7A). In FIG. 7, the through rod 6 is drawn smaller than the through hole 25 so as to show the welded portion 9. As shown in FIG. The main member 2α arranged on the outermost side of the grating 1 has two portions on one end side and the other end side, and welded portions 9 for connecting the main member 2 and the through rod 6 are formed on both sides. Since the through-rod 6 is inserted through the through-hole 25 when the welded portion 9 is present, the other main member 2 is also locked by the through-rod 6 and the intermediate member 3 and integrated.
As shown in FIG. 9 to be described later, when the intermediary member 3 protrudes outward from the outermost main member 2α, the through rod 6 replaces the outermost main member 2α with the intermediary member 2α. It may also be welded to the longitudinal end portions of member 3 . In such a case as well, all of the main member 2 are engaged with the through rod 6 and the intermediate member 3 and integrated.

Thus, the grating 1 in which the main member 2, intermediate members 3, side edge members 5, and through rods 6 are fixed and integrated is completed. Each main member 2 is integrally held by the side edge member 5 with the intermediate member 3 by the through rod 6, and the desired grating shape as shown in FIGS. 1 and 7(a) is completed.

This embodiment is a grating 1 that is rectangular in plan view, as shown in FIG. . Both end portions 29 of the main member 2 are fitted into the grooves 310, respectively, and each main member 2 is sandwiched between the side edge members 5 with intermediate members 3, and one longitudinal end side of the side edge member 5 is arranged in a plurality. A protruding portion 59 is formed to protrude from the outermost one 2α of the main members 2 thus formed. The protruding length of the protruding portion 59 is matched with the width of the gap ε. After the grating 1 is connected, a gap ε is secured at the connecting portion of the grating 1 as indicated by the dashed line in FIG. This leads to improvement in appearance when the grating 1 is connected.

(2) Embodiment 2
In the grating of the second embodiment, the main member 2 is replaced with the flat bar 2A of the first embodiment, and an I bar 2B as shown in FIGS. 9 to 11 is used. The I bar 2B is a general-purpose member having a uniform cross-sectional shape with an "I" shape when viewed from the side in the longitudinal direction. The main member 2 is an I-bar 2B having an I-shaped cross section, and at both end portions 29 of the main member 2, the main portion 21 having a plate-like cross section is fitted into the concave groove 310 of the bent portion 31, and The head portion 22 of the I-bar 2B, which extends above the main portion 21, is placed on the cross section ⊃-shaped portion 31a of the bent portion 31 and locked (FIG. 11). A groove short side 3102 of the concave groove 310 is set according to the thickness of the main portion 21 . The head portion 22 of the I bar 2B is placed on the cross-sectional ⊃-shaped portion 31a of the bent portion 31 and locked, so that the I bar 2B is vertically positioned on the intermediate member 3 and stably held. . The head portion 22 of the I bar 2B is a thick portion extending upward from the plate-like main portion 21 in a side view and increasing in thickness via a tapered portion 221 as shown in FIG. The head 22 of the present invention shall also include the tapered portion 221 . In addition, FIG. 9 is a reference drawing in which the side edge member 5 is protruded from the outermost main member 2α to form a short projecting portion 59. As shown in FIG. Other configurations are the same as those of the first embodiment, and the description thereof is omitted. The same reference numerals as in Embodiment 1 indicate the same or corresponding parts.

(3) Embodiment 3
The grating of Embodiment 3 uses a T-bar 2C as the main member 2 instead of the flat bar 2A of Embodiment 1 (FIG. 12). The main member 2 is a T bar 2C having a T-shaped cross section, and a through hole 25 is provided in the center of the band width direction at both end portions 29 of the T bar 2C in the same manner as in FIGS. At both end portions 29 of the main member 2, the main portion 21 having a plate-like cross section is fitted into the concave groove 310 of the bent portion 31, and the upper surface 2a of the T-bar 2C extending above the main portion 21 is It is flush with the upper horizontal portion 512 of the side edge member 5 . In FIG. 13, the positions of the through holes 25 provided in both end portions 29 of the T-bar 2C are moved slightly upward as shown in the figure, and the head 22 is placed on the cross section ⊃-shaped portion 31a of the bent portion 31, It is configured to be locked. The head 22 of the T-bar 2C is placed on and locked to the cross-section ⊃-shaped portion 31a of the bent portion 31, and the T-bar 2C is vertically positioned by the intermediary member 3 and stably held. The head portion 22 of the T-bar 2C extends upward from the plate-like main portion 21 in a side view and passes through the tapered portion 221 to form a horizontal plate-like head portion with a horizontal thickness of T. is the part that increases to The head 22 of the present invention shall also include the tapered portion 221 .

If the T-bar 2C is used as the main member 2 as in the present embodiment, even if the same number of T-bars 2A and I-bars 2B are used, as shown in FIG. ε becomes narrower. It is perfect as a measure to prevent high heels from entering.
Although all the main members 2 may be T-bars 2C, in this embodiment only the outermost main members 2α are flat bars 2A as shown in FIG. This is to make the frame outer surface of the grating 1 flat to improve usability and appearance. In the figure, a welded portion 9 for joining the outermost main member 2 and the through rod 6 is formed, but this is omitted. Other configurations are the same as those of the first and second embodiments, and the description thereof is omitted. The same reference numerals as in Embodiment 1 indicate the same or corresponding parts. In the drawing, reference numeral 23 denotes the lower portion of the I bar, 2a the upper end face of the main member 2, D1 the side wall of the drainage groove D, and D2 the step surface.

(4) Effect The grating configured in this way can greatly reduce the number of welding points. FIG. 1 is a simplified illustration of the grating 1. For example, in FIG. 101 main members 2 are required for the grating 1. As shown in FIG. 14, the conventional grating m must be welded to the side plate 8 at two locations on both ends of each main member f, requiring welded portions 9 at a total of 202 locations. On the other hand, according to the present invention, in addition to the four points where the intermediate member 3 and the both end portions 29 of the side edge member 5 are welded at the four corners of the rectangular grating 1 in FIG. 6 and the portion of the main member 2α around the through-hole 25 disposed on the outermost side are added. When the bent portion 31 protrudes outward from the outermost main member 2α, the bent portion may replace the main member 2α. Eight places in total. Welding work, which was previously a heavy burden, can be greatly reduced. In the conventional grating m shown in FIG. 14, if the width of the gap ε is narrowed in order to improve the appearance, the welded portion 9 tends to increase. A total of eight places remain unchanged.
Furthermore, the welding joints at both end portions of the intermediate member 3 and the side edge member 5 can be further halved by replacing them with the stuffing bodies 7 as shown in FIG.

The intermediary member 3 can easily form the bent portion 31 provided with the grooves 310 and the outer flange 35 by a forming process or the like. Then, the grating 1 can be assembled by automatically arranging the main members 2 as they are at a predetermined pitch. Then, when the through-bars 6 are arranged to pass through the group of through-holes 25 housed in the cross-sectional ⊃-shaped portion 31U of the bent portion 31, the assembly of the grating 1 is completed. After that, the present grating 1 can be completed only by welding and joining the above-mentioned eight points. It leads to improvement of workability of grating production and realizes cost reduction.

Further, in Patent Document 1, it is necessary to process both ends of the main member 2 to protrude the connection locking pieces, and this processing is required for all the main members 2, which is a great burden. It suffices to cut the flat bar 2A, I bar 2B, etc. to a predetermined length. Especially in the case of the I bar 2B, in Patent Document 1, the head portion 22 and the lower portion are thick portions, and cutting and processing these portions greatly increases the working time and increases the cost, but the present invention is a connecting member. Since no stop piece is provided, such a problem does not occur.
In addition, in Patent Document 1, when the grating 1 is completely assembled, the connecting locking piece is accommodated in the hollow portion of the frame member. The connecting locking piece does not enter the length of the bearing bar (corresponding to the main member 2 of the present invention) arranged between the frame members on both sides. Therefore, the yield of the base material for the main member 2 is lowered. Since the connecting locking pieces are provided at both ends of the main member 2, the maximum yield is "{the length of the main member 2 arranged between the side frame members/(the length of the main member 2 arranged between the side frame members + Protruding length of connecting locking piece x 2)} x 100"%. On the other hand, according to the present invention, the main member 2 is cut into strips, and the side end surfaces 291 of the strip plate contact the bent ends 55 of the side edge members 5 as shown in FIGS. Up to 100% utilization of wood. The yield of effectively utilizing the base material for the main member 2 as the main member 2 is by far high. Since many main members 2 are incorporated into one grating 1, it greatly contributes to cost reduction.

Then, the head 22 of the I-bar 2B or the head 22 of the T-bar 2C, which extends above the main portion, is placed on the upper surface 31a of the bent portion 31, which is the ⊃-shaped cross section, and locked. Then, when the main member 2 is completely fitted into the groove 310, the main member 2 can be positioned not only in the horizontal direction but also in the vertical direction. Alignment adjustment of the many main members 2 to the side edge members 5 with intermediate members 3 becomes unnecessary, and the assembling workability is remarkably improved.

In addition, the stuffing body is inserted into the U-shaped processed portion 51 by contacting the back surface 35b of the outer collar 35 engaged with the bent end portion 55 and the inner wall surface 51b of the U-shaped processed portion 51. 7, at both ends in the longitudinal direction of the side edge member 5 with the intermediate member 3 in the state of bent portions 31 projecting outward from the side edge member 5, the intermediate member 3 and the side edge member 5 Welded connections can be dispensed with.
Furthermore, when one longitudinal end of the side edge member 5 protrudes from the outermost one of the plurality of main members 2 to form a projecting portion 59, as shown in FIG. When this grating 1 is connected to the upper surface of the opening and covered, a gap ε corresponding to the gap ε formed in the grating 1 can be provided even at the joint of the gratings 1 . Since the gaps ε are arranged at regular intervals, it contributes to the improvement of the scenery.
Thus, the grating of the present invention exhibits the numerous excellent effects described above and is extremely useful.

It should be noted that the present invention is not limited to those shown in the above embodiments, and various modifications can be made within the scope of the present invention according to the purpose and application. The shape, size, number, material, etc. of the main member 2, the intermediate member 3, the groove 310, the side edge member 5, the through rod 6, the stuffing member 7, etc. can be appropriately selected according to the application.

1 grating 2 main member
2α Outermost main member (outermost main member)
25 Through hole 29 Both ends 291 Side end surface 3 Intermediate member 31 Bending portion 31U In cross section ⊃-shaped portion 310 Groove 35 Outer collar
35b back of outer collar
4 perforated plate
41 Central
410 long hole
4101 hole long side
45 side part (tip part)
5 side edge member
51 U-shaped processed part (cross-sectional U-shaped processed part)
51 In the space of the U-shaped processed part
55 bending end
6 Through rod 7 Filling body 9 Welded part P Distance between long holes (distance between grooves)
W Hole short side length (groove short side width)

Claims (3)

a plurality of band plate-shaped main members having through holes provided at both end portions and arranged upright in the band width direction;
A perforated plate having a ⊃ cross section in which a plurality of long holes whose long sides are in the width direction of the belt-like plate are provided at a predetermined pitch in the longitudinal direction in the central part except for both sides of the belt-like plate in the width direction. The central portion is formed into a bent portion with the long hole as a comb tooth-shaped concave groove in plan view, and the both side portions are bent at the upper and lower tip portions of the bent portion with a ⊃ cross section. a pair of intermediate members formed on outer flanges extending upward and downward, respectively;
a pair of side edge members that are formed into processed portions that have a U-shaped cross section and that are formed into bent end portions that are bent so that both end portions thereof face each other;
The bent portion related to the pair of side edge members with the mediation member projecting outward from the side edge member by locking the outer flange to the bent end portion in the space of the U-shaped processed portion. A through-bar that sandwiches a plurality of the main members and that passes through a group of the through-holes that are accommodated in the cross-sectional triangular portion of the bent portion with both end portions of each main member fitting into the respective concave grooves. and
The intermediate member and the side edge member related to the side edge member with the intermediate member projecting outward from the side edge member with the bent portion are welded to each other, and 1. A grating characterized in that the main members on one end side and the other end side arranged on the outside are formed with welded portions for joining the main members and the through rods, and are integrated into a rectangular shape in a plan view. The intermediate member and the side edge member are welded at one end or both ends of the side edge member with the intermediate member to weld the intermediate member and the side edge member related to the side edge member with the intermediate member. 2. The grating of claim 1, which is bonded . Instead of welding and joining the intermediate member and the side edge member related to the side edge member with the intermediate member, 3. The grating according to claim 1 or 2, further comprising a stuffing body that is inserted into the space of the U-shaped processed portion so as to abut against the back surface of the flange and the inner wall surface of the U-shaped processed portion. .

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