JP2008133658A - Grating fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grating fixing device capable of easily fixing a grating placed on the mounting surface of a structure from the upper side. <P>SOLUTION: This grating fixing device 10 comprises a support plate 11 secured to the lower surface of the grating G at a position apart slightly from the end edge Sb of the flange Sa of an I-steel, a screw member 12 screwed to a nut 14 fixed to the support plate 11 from the lower side, and a lock plate 13 having a through hole 13c through which the shaft part 12a of the screw member 12 is rotatably inserted from the lower side and supported on the lower side of the support plate 11. The lock plate 13 is engaged with the hexagon hole 12b of the screw member 12, rotated, and tightened to an opening formed between the main members G1, G1 of the grating G from the upper side of the grating G by using a hexagon wrench to move the lock plate 13 upward and lock it to the flange Sa of the I-steel S for fixing the grating G. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a grating fixing device for fixing a grating to a structure having a flange.

  Roads and sidewalks are provided with U-shaped side grooves for draining rainwater, etc., and gratings that are formed in a lattice shape and have a plurality of openings in the vertical direction are attached to the side grooves as lids. . This grating is detachably attached to a structure such as an angled steel with an L-shaped cross section provided on the upper edges of both sides of the side groove in order to prevent floating during a flood and jumping due to the passage of a vehicle or the like. . In the conventional method of attaching the grating to the angle steel, screw holes for bolting are formed at positions corresponding to the mounting holes provided in advance in the grating with an angle steel flange, and bolts are installed in these screw holes. Was fixed by screwing. In such a method, the angle steel has a problem that it takes time to accurately form screw holes at respective positions corresponding to mounting holes provided in the grating in the field.

  As a solution to the above problem, the grating disclosed in Patent Document 1 is disclosed. In the grating described in Patent Document 1, an auxiliary member having a vertical through-hole is welded and fixed at a position near the outer frame on the bottom surface of the grating. A rotating shaft, in which a clamping plate is welded and fixed to one end side and a spanner hook is formed on the other end side, is inserted from the lower side of the auxiliary member and is rotatably attached by tightening the nut on the upper side. Yes. In addition, this clamping plate is circular or horseshoe-shaped, and in order to facilitate tightening and releasing the tightening, the clamping plate is formed between one end formed thick and the other end formed thin. A gradient is formed. In this grating, before fixing to the angle steel, it is positioned at a position where it is locked with the bottom plate of the angle steel at the position where the tightening plate is thickened, and the nut is spot welded in this positioned state. Alternatively, fix with a rotation prevention pin.

When fixing this grating, the grating is placed on the angle steel provided on the upper edge of both sides of the U-shaped side groove, and a clamping plate is inserted into the cavity formed on the bottom side of the angle steel, By tightening the rotating shaft with a spanner, the angle steel is sandwiched between the fastening plate and the auxiliary member, and the grating is fixed to the angle steel.
JP2003-268855A.

  In the grating described above, the clamping plate is welded and fixed so as to rotate integrally with the rotating shaft. Therefore, before fixing the grating, the angle plate is formed at a position where the clamping plate is previously formed thick. It is necessary to position at a rotational position that can be locked by tightening to the bottom side, and fixing the nut by spot welding or the like in this positioned state is troublesome. In addition, if the rotational position of the clamping plate is not accurately positioned, there is a risk that a gap will be formed between the clamping plate and the bottom surface of the angle steel, or that the clamping plate cannot be locked with the angle steel. there were. The present invention aims to solve such problems.

  To this end, the grating fixing device according to the present invention is a grating fixing device for fixing a grating having a plurality of openings penetrating vertically on a mounting surface of a structure having a flange, and is attached to the structure on the lower surface of the grating. A support plate provided with a screw hole positioned inside the opening when viewed from above and below, and a shaft portion having a head at one end. A screw member screwed into the screw hole from the lower side of the support plate, and a portion between the head portion of the shaft portion of the screw member and the support plate are rotatably inserted into a through hole formed in a part thereof. A locking plate supported on the lower side of the support plate, and provided with a tightening portion that can be tightened through the opening of the grating at the tip of the shaft portion of the screw member. Characterized in that the lower surface is engaged with grating flange of the locking plate structures to fix the structure by tightening the.

  In the grating fixing device configured as described above, the grating member can be fastened to the lower surface of the flange of the structure by fastening the screw member with the tightening portion from the upper side of the grating to fix the grating to the structure. Therefore, the fixing work can be easily performed without entering the lower side of the mounted grating. Further, since the locking plate is rotatable with respect to the screw member, the locking plate can be locked in advance with the lower surface of the flange of the structure as compared with the locking plate fixed to the screw member. This eliminates the need for positioning at a position and makes it possible to perform the fixing work easily.

  In the above grating fixing device, it is preferable that the tightening portion is formed with a polygonal hole at the tip end portion of the shaft portion so that it can be tightened through the opening. The tightening operation can be performed with a simple tool such as a member.

  In the above-described grating fixing device, it is preferable that the screw member has a length that does not protrude from the upper surface of the grating. In such a case, the appearance of the grating is improved, and a person or vehicle passing over the grating is It won't get caught.

  In the above grating fixing device, the support plate is preferably provided with a detent that engages with the locking plate at a height position where the locking plate locks with the lower surface of the flange of the structure. In this case, it is not necessary to stop the locking plate at the height position described above, and the tightening operation is facilitated. Further, when the screw member is tightened and the locking plate is locked to the lower surface of the flange of the structure, the locking plate does not rotate and become locked with the rotation of the screw member.

  Hereinafter, an embodiment of the grating fixing device according to the present invention will be described with reference to FIGS. The grating fixing device 10 in this embodiment fixes the grating G to the upper side of the plurality of I-shaped steels S provided as a structure on the floor of a factory or the like. As shown in FIG. 1, the grating G is a plate-shaped flat steel main member G1 with the width direction of the main member G1 being vertically arranged at predetermined intervals, and the same plate-like shape as the main member at both ends in the longitudinal direction. A frame member G2 made of flat steel and a secondary member G3 made up of a plurality of screw bars arranged at a predetermined interval in a direction orthogonal to the main member G1 at an intermediate portion between the main members G1 are fixed by welding. The grating G has a lattice shape having a plurality of openings penetrating in the vertical direction formed by the main member G1, the frame member G2, and the sub member G3. The grating G in the present embodiment has a vertical and horizontal length of 1000 mm and a height of 32 mm shown in FIG. The plate-shaped main member G1 has a thickness of 3 mm, and the distance between the main members G1 and G1 is 15 mm.

  The grating fixing device 10 is provided at a position near the edge Sb of the flange Sa of the I-shaped steel S when it is attached to the I-shaped steel S on the lower surface of the grating G. The grating fixing device 10 is fixed to a position near the edge Sb of the flange Sa of the I-shaped steel S when attached to the I-shaped steel S on the lower surface of the grating G, and when viewed from above and below, the grating G A support plate 11 provided with a screw hole located inside the opening, and a screw member 12 in which a shaft portion 12a having a head portion 12c at one end is screwed into a screw hole of the support plate 11 from below the support plate 11. The locking member 12 is rotatably inserted into a through hole 13c formed in a part of a portion between the head portion 12c of the shaft portion 12a of the screw member 12 and the support plate 11 and supported below the support plate 11. It consists of a plate 13. As shown in FIG. 1, the grating fixing device 10 according to the present embodiment is attached to eight locations for one grating G. However, the present invention is not limited to this. It is sufficient that one or more places are attached.

  As shown in FIG. 3, the support plate 11 is made of a side-shaped U-shaped sheet metal member whose both ends are bent downward, and is folded at both ends at a position slightly apart from the edge Sb of the flange Sa of the I-shaped steel S. The curved portion 11a is welded and fixed to the lower surface of the grating G in such a direction as to be substantially orthogonal to the edge Sb of the flange Sa. The bent portion 11a of the support plate 11 functions as a detent that engages with the locking plate 13 as will be described later. The support plate 11 is provided with a rectangular through-hole 11b through which the screw member 12 passes substantially in the center, and a nut (screw hole) 14 that is screwed into the screw member 12 is fixed to the through-hole 11b by welding. Has been. The screw hole of the nut 14 is located inside the opening formed between the main members G1 and G1 of the grating G when viewed from above and below. In this embodiment, the nut 14 is fixed to the through hole 11b. However, the nut 14 may be eliminated and a female screw may be cut directly on the support plate 11.

  As shown in FIGS. 1 to 3, the screw member 12 is a hexagonal bolt in which a hexagonal hole (clamping portion) 12 b is formed at the tip of a shaft portion 12 a in which a male screw is cut. Screwed into the nut 14. The diameter of the shaft portion 12a of the screw member 12 is 8 mm, and the diameter of the shaft portion 12a of the screw member 12 is considerably smaller than the distance between the main members G1 and G1, and rotates between the main members G1 and G1. It is possible. Further, the length of the screw member 12 is 40 mm, and the length of the shaft portion 12 a does not protrude from the upper surface of the grating G when the locking plate 13 is attached to the support plate 11.

  As shown in FIG. 2, the locking plate 13 is a L-shaped sheet metal member having a side surface formed by a flat locking portion 13 a and a bent portion 13 b that is bent upward at one end thereof. A through hole 13c through which the shaft portion 12a of the screw member 12 passes is formed in the locking portion 13a at a position closer to the bent portion 13b than the center portion, and the through hole 13c is passed through the screw member 12. The position is eccentric to one end side. The locking plate 13 is freely rotatable when the head 12 of the screw member 12 is locked to the lower surface of the locking plate 13 and the shaft portion 12 a extends upward from the through hole 13 c of the locking plate 13 and is screwed with the nut 14. It is supported so as to be movable in the vertical direction.

  The grating fixing device 10 according to the present invention configured as described above fixes the grating G to the upper side of a plurality of I-shaped steels S provided as a foundation structure of a floor portion of a factory or the like by the following procedure. When the grating G is fixed by the grating fixing device 10, a locking plate 13 is previously attached to the support plate 11 fixed to the lower surface of the grating G via a screw member 12. Specifically, the shaft 12a of the screw member 12 is inserted into the through hole 13c of the locking plate 13 from below, and the tip end portion of the shaft portion 12a of the screw member 12 is screwed with the nut 14 fixed to the support plate 11. The locking plate 13 is attached so as to be movable in the vertical direction.

  Thus, the grating G in which the screw member 12 and the locking plate 13 are attached to the support plate 11 is placed at predetermined positions on the plurality of I-shaped steels S. A rod-shaped tool such as a screwdriver is inserted through the opening formed between the main members G1 and G1 of the grating G, and the locking plate 13 is rotated about the shaft portion 12a so that the tip of the locking portion 13a is positioned. Positioning is performed so that it can be engaged with the flange Sa of the I-shaped steel S. After this positioning, the locking plate 13 is moved upward by rotating and tightening the screw member 12 with a hexagonal wrench engaged with the hexagonal hole 12b at the tip while the locking plate 13 is prevented from rotating by a driver. After the locking plate 13 is moved upward to a position where it can be prevented by the bent portion 11a of the support plate 11, a screwdriver 12 is taken out and the screw member 12 is further tightened with a hexagon wrench. 13 is locked to the lower surface of the flange Sa of the I-shaped steel S. When the locking plate 13 is moved upward by the screw member 12, the bent portion 13b of the locking plate 13 comes into contact with the lower surface of the main member G1 of the grating G, and the tip of the locking portion 13a is I-shaped steel S. 2 and is inclined obliquely so that the bent portion 13b side is on the lower side, as shown in FIG. As a result, the locking plate 13 is locked with the flange Sa of the I-shaped steel S only at the tip of the locking portion 13a, and is difficult to come off. As described above, the grating fixing device 10 detachably fixes the grating G to the I-shaped steel S by firmly sandwiching the flange Sa of the I-shaped steel S by the lower surface of the grating G and the locking plate 13.

  In the grating fixing device 10 described above, the locking plate 13 is I-shaped by tightening the screw member 12 with the hexagonal hole 12b using a hexagonal wrench inserted into the opening from the upper side of the grating G placed on the I-shaped steel S. The grating G can be fixed to the lower surface of the flange Sa of the steel S by firmly holding the flange Sa of the I-shaped steel S between the lower surface of the grating G and the locking plate 13. Accordingly, the fixing work can be easily performed from above the grating G without performing the fixing work below the grating G.

  In addition, since the locking plate 13 is rotatable with respect to the screw member 12, the locking plate 13 is preliminarily compared with the fastening plate 13 of the related art that is fixed to the rotating shaft by welding. The nut 14 does not need to be fixed to the support plate 11 by welding after being positioned at a position where it can be locked to the lower surface of the flange Sa of the shape steel, and the nut 14 is supported in advance regardless of the position of the lock plate 13. It is possible to fix the grating G or to facilitate the fixing work of the grating G. In addition, since the locking plate 13 is not fixed to the screw member 12, when the screw member 12 is rotated and tightened, the screw member 12 can be rotated with a smaller force than that in which the locking plate 13 is fixed. Fixing work becomes easy. Further, in the above-described grating fixing device 10, since the grating G is detachably fixed to the I-shaped steel S, the lower side of the grating G can be easily removed.

  In the grating fixing device 10 described above, the screw member 12 is rotatable by a hexagonal hole 12b formed at the distal end portion of the shaft portion 12a as a tightening portion thereof. Therefore, the main member of the grating G as in the present embodiment. Even when the gap between G1 and G1 is narrow, the screw member 12 can be rotated and tightened without cutting a part of the main member G1 if there is a sufficient gap for rotating the screw member 12. Thereby, if the grating fixing device 10 has an opening wider than the thickness of the shaft portion 12a of the screw member 12 at a predetermined position, the grating G is formed into an I-shaped steel without cutting or deleting a part of the grating G. It can be fixed to S.

  Further, in the above-described grating fixing device 10, the screw member 12 has a length that does not protrude from the upper surface of the grating G, so that the appearance of the mounted grating G is improved, and people and vehicles passing on the grating G can be seen. The screw member 12 does not get caught.

  Further, in the grating fixing device 10 described above, the support plate 11 is engaged with the lock plate 13 by the bent portion 11a at a height position where the lock plate 13 is locked with the lower surface of the flange Sa of the I-shaped steel S. Therefore, it is not necessary to stop the locking plate 13 at the height position described above, and the tightening operation is facilitated. Further, when the screw member 12 is tightened and the locking plate 13 is locked to the lower surface of the flange Sa of the I-shaped steel S, the locking plate 13 rotates with the rotation of the screw member 12 and the flange Sa of the I-shaped steel S is rotated. The engagement with the lower surface of the plate is not released.

  The tightening portion of the screw member 12 in the present invention is a hexagonal hole 12b formed at the tip of the shaft portion 12a. However, the present invention is not limited to this, and a square hole or other polygonal hole is formed. It is also possible to use a rotating wrench or a wrench hook formed on the tip of the shaft portion 12a.

  The grating fixed in the present invention is a grid having a plurality of openings penetrating in the vertical direction by intersecting the main member G1 and the sub member G3 as in the present embodiment. The grating fixed to the apparatus is not limited to this, and any grating may be used as long as it has a plurality of openings penetrating in the vertical direction in a sheet metal-like floor structure board or lid.

  The grating fixing device 10 according to the present embodiment is fixed to the I-shaped steel S as one of the structures, but the present invention is not limited to this, and a flange such as an I-shaped steel is used as another structure. It may be fixed to an H-shaped steel, an angle steel or the like which is a structure having Sa.

It is the top view which shows one Embodiment of the grating fixing device by this invention, and a partially expanded plan view. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS S ... Structure (I shape steel), G ... Grating, 10 ... Grating fixing device, 11 ... Support plate, 11a ... Detent (folded part), 12 ... Screw member, 12a ... Shaft part, 12b ... Fastening part (Hexagonal hole), 12c ... head, 13 ... locking plate, 13c ... through hole, 14 ... screw hole (nut).

Claims (4)

A grating fixing device for fixing a grating having a plurality of openings penetrating in a vertical direction on a mounting surface of a structure having a flange,
When attached to the structure on the lower surface of the grating, a screw hole is provided which is fixed to a position near the edge of the flange of the structure and located inside the opening when viewed from above and below. A support plate;
A screw member in which a shaft portion having a head at one end is screwed into the screw hole from below the support plate;
From a locking plate that is rotatably inserted into a through hole formed in a part of a portion between the head portion of the shaft portion of the screw member and the support plate and supported on the lower side of the support plate Become
A fastening portion that can be fastened through the opening of the grating is provided at the tip of the shaft portion of the screw member, and the screw member is fastened from the upper side of the grating to attach the locking plate to the flange of the structure. A grating fixing device, wherein the grating is fixed to the structure by being locked to a lower surface.   2. The grating fixing device according to claim 1, wherein the tightening portion can be tightened through the opening by forming a polygonal hole at a tip portion of the shaft portion.   The grating fixing device according to claim 1, wherein the screw member has a length that does not protrude from an upper surface of the grating.   The rotation stop which engages with the said locking plate in the height position where the said locking plate locks with the lower surface of the said flange is provided in the said support plate, The any one of Claims 1-3 characterized by the above-mentioned. The grating fixing device according to claim 1.

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