JPH0364657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a structure for fixing a grid-like lid (grating) to a bridge or road groove.

<Prior Art> Conventionally, as this type of fixing structure, the one shown in FIG. 8 is known. In this structure, the grating is placed on a support plate b made of angle material or the like provided on the inner wall of the groove, and two nuts e and g are placed on the support plate b.
It is fixed using a bolt d and a holding member f. To explain in detail, a hole is made in the support plate b, a bolt d is inserted from below, and the bolt d is fixed to the support plate b with a type 3 nut e. Then, a substantially M-shaped holding member f is passed between the grating plates c' and c' of the grating. A hole is made in the center of the holding member f, and after passing a bolt d through this hole, it is tightened and fixed with a washer and a nut g.

<Problems to be Solved by the Invention> However, the conventional structure has the following problems.

First, when attaching and detaching the grating, the bolt d
You have to remove nut g from. As a result, not only the workability deteriorated but also the removed nut g often fell into the groove and lost powder.

Second, the holding member f is a grid plate of grating.
Since it is passed between c' and c', it protrudes from the upper surface of the grating by the thickness of the holding member f. As a result, pedestrians often trip over this protruding pressing member f, which is dangerous.

Third, since it is necessary to fix the bolt d on the support plate b, it is necessary to make a hole in the support plate b, pass the bolt d through it, and use a type 3 nut e to fix the bolt d. Ta. Furthermore, when the lower surface of the support plate b is inclined, it is necessary to use an inclined washer h.

<Means for Solving the Problems> Therefore, the present invention provides a structure in which a grating placed on a support plate provided in a groove or the like is fixed by a fastener made of bolts and nuts. The fastening device is attached to the support plate by a rotating member so as to be able to rise and fall freely, and a receiving portion is provided in the grating to receive the tightening force of the fastening device. It has a receiving recess that receives the shaft of the bolt, and an open part that allows the bolt shaft to pass through when the fastener is rotated up and down, and by raising and tightening the fastener, the grating is fixed and tightened. The above-mentioned problems are solved by providing a grating fixing structure characterized in that the grating can be removed by loosening the dressing and laying it down.

Moreover, in the above-mentioned fixing structure, there is provided a fixing structure characterized in that the receiving part is inclined in a direction opposite to the direction in which the fastener is laid down.

<Example> Embodiments of the present invention will be described below based on the drawings.

1 to 4 are for explaining the first embodiment.
The figure is a sectional view taken along the line -- in FIG. 3, FIG. 3 is a plan view of the main part of the embodiment, and FIG. 4 is an overall explanatory diagram of the grating.

As shown in FIG. 4, the grating c is a grid-like lid that closes a groove (vertical groove in the example) on a building such as a bridge or on a road, and is a support plate provided on the inner wall surface a of the groove. b.

Then, the bolts installed on support plate b
The grating c is fixed to the support plate b by a fastener made of a nut and a receiving part provided in the grating c.

First, the mounting structure of the fastener will be explained.

This fastening device consisting of the bolt 1 and nut 2 is assembled with a bracket 3 and a shaft fixing pin 4.
It is mounted on support plate b.

The bracket 3 is a U-shaped member in a plan view, which includes a central wall portion 31 and both side wall portions 32 extending at right angles from both ends thereof. This bracket is fixed on the support plate b by welding. A pin insertion hole is formed in both side wall portions 32, 32 of this bracket.

This pin 4 locks the bolt so that it can freely rotate up and down, and a pin insertion hole is bored at the lower end of the shaft of the bolt 1. Therefore, the pin 4 is inserted through each insertion hole, thereby allowing the bolt 1 to freely rise and fall. It is desirable that both ends of the pin 4 be made non-removable by appropriate means such as caulking.

A washer 6 is inserted into the upper end of the bolt 1, and a nut 2 is screwed together. It is desirable to use a nut 2 that has various loosening prevention functions. The washer 6 may be used as required, and a nut with a washer may be used.

The lower end of the bolt 1 is cut into a circumferential shape for its up-and-down rotation.

Next, the grating c is provided with a receiving portion 5. This receiving part is a plate-shaped body that receives the tightening force of the bolt 1 and nut 2, and the grating c
It is fixed by welding to the lattice plate c'....
This receiving part 5 has a receiving recess 51 for the bolt 1 shaft part.
is formed, and when the bolt 1 is rotated up and down,
An open portion 52 is formed through which the bolt passes.

The length of the bolt 1 and the position of the pin 4 are preferably set so that when the fastener is stood up and tightened, its upper end does not protrude from the upper surface of the grating c. The position of 5 is also determined.

Next, how to use this embodiment will be explained.

(a) Place grating c on support plate b.

(b) With nut 2 loosened, raise bolt 1.

(c) Tighten nut 2 (Figures 1 and 2).

Thereby, the grating c is fixed on the support plate b.

(d) When removing the grating, loosen nut 2 and lower bolt 1. Thereby, the grating can be removed upward without removing the nut 2.

In this embodiment, the bracket 3 is composed of a central wall portion 31 and both side wall portions 32, 32, so it has a structure that is strong against vertical tightening force, external force, and external force from the lateral direction. .

Next, another embodiment will be described based on FIGS. 5 and 6.

In this embodiment, the bracket 3' is attached to the bottom part 3.
1' and both side wall portions 32' extending upward from both ends thereof, and the pin 4' is connected to the both side wall portions 32'.
It is rotatably inserted between them. The lower end of the bolt 1 is fixed to this pin 4' by welding. Note that other points and usage methods are the same as in the previous embodiment. In this embodiment, since the pin 4' and the bolt 1 are fixed by welding, there is an advantage that the length of the bolt 1 can be made relatively short.

Finally, still another embodiment will be described based on FIG. This embodiment is a further modification of the second embodiment, and is characterized in that the receiving portion 5' is attached at an angle. This slope is determined by bolt 1
It is tilted in the opposite direction to the direction of lodging, and the tilt angle (α) is a little over 10 degrees, but this can be changed as appropriate.

This embodiment has the advantage that even if the nut 2 becomes loose as a result of long-term use, the bolt 1 is unlikely to fall.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the shapes, sizes, etc. of each part can be changed as appropriate within the scope of the claims. A device with a head may also be used. Further, contrary to the embodiment, the nut portion of the fastener may be rotatably attached, and the bolt head may apply a tightening force to the receiving portion.

<Effects of the Invention> As described above, the present invention exhibits the following effects.

First, the grating can be attached and detached by loosening the fasteners and rotating them up and down. As a result, there is no need to remove nuts one by one as in the past, which not only improves work efficiency but also eliminates the possibility of losing nuts.

Second, since the bracket does not protrude above the grating surface as in the conventional case, safety for pedestrians is also improved.

Thirdly, in the invention described in claim 2,
In addition to the above effects, even after long-term use, the fastener was prevented from falling down, and the reliability of fixation was further improved.

Fourth, if the bracket is fixed to the support plate by welding as in the embodiment, there is no need for bolt holes or type 3 nuts, and even if the bottom surface of the support plate is sloped,
There is no need to use an inclined washer.

[Brief explanation of drawings]

1 is a cross-sectional view taken along the - line in FIG. 3, FIG. 2 is a sectional view taken along the - line in FIG.
The figure is a side longitudinal sectional view of the second embodiment, FIG. 6 is a front longitudinal sectional view thereof, FIG. 7 is a side longitudinal sectional view of another embodiment, and FIG. 8 is a longitudinal sectional view of the conventional example. . 1... Bolt, 2... Nut, 3, 3'... Bracket, 4, 4'... Pin, 5, 5'... Receiving part, 51... Receiving recess, 52... Opening part, a...
...Inner wall surface of the groove, b...Support plate, c...Grating.

Claims (1)

[Scope of Claims] 1. In a structure in which a grating placed on a support plate provided in a groove or the like is fixed by a fastener made of bolts and nuts, the fastener is a rotating member. The grating is mounted on the support plate so that it can rise and fall freely, and a receiving part is provided in the grating to receive the tightening force of the fastener.This receiving part receives the shaft of the bolt when the fastener is raised. It has a concave part and an open part that allows the bolt shaft to pass through when the fastener is rotated up and down, and the grating is fixed by standing up the fastener and tightening it, and by loosening the fastener and letting it fall down. A grating fixing structure characterized by making the grating removable. 2. The grating fixing structure according to claim 1, wherein the receiving portion is inclined in a direction opposite to the direction in which the fastener is laid down.