JPH0248546Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an improvement of an anti-theft device for gratings installed on the top of gutters (side ditches and cross ditches) or catch basins for collection and drainage. It is something.

[Conventional technology]

As a grating anti-theft device, as shown in Fig. 5, a steel bar c is welded between some main bars a and a in a grating consisting of a main bar a, a cross bar b, etc.
In addition, there is already known a chain d whose one end is fixed to the inner surface of a groove or box and whose other end is connected by a shackle e. e′ is a bolt and e″ is a nut.

[Problems to be solved by the invention] The above conventional example had the following problems.

Processing of the grating itself (welding of the steel bar c) is required, which increases the manufacturing cost of the grating. In particular, in the case of steel grating, steel bar c
Welding must be done before the plating process,
A manual welding process is introduced in the middle of the grating production line, resulting in an extremely low production efficiency.

Some main bars a, steel bar c welded between a
Since the chain d is connected to the shaft e by the shaft e, the positions where the chain d can be connected to the grating are limited. Therefore, when an anchor for fixing one end of chain d is buried in the inner surface of a trench or box at a construction site, or when a U-shaped block made of precast concrete with an anchor buried in a predetermined position is installed underground. When constructing a groove using a grating, either make the chain d longer than necessary, or take into account the positional relationship with the steel bar c welded between the main bars a and a of the grating, and use anchors or U-shaped blocks. If these steps are not performed, the gratings will not be able to be connected, making construction extremely troublesome. Even if the anchor is buried in the designed position considering the positional relationship with the steel bar c, if the allocation of the grating installed on the trench is changed during construction, the connection may become impossible.

The present invention is an improvement on the above-mentioned points of the grating anti-theft device.It is economical as it does not require any processing on the grating itself, and can be attached to any main bar. Because the chain can be connected at any position in the longitudinal direction of the grating, it is possible to easily install anchors, etc., and the purpose is to make it easier to change the grating layout during construction.

[Means for solving problems]

The technical measures taken by the present invention to achieve the above objective are as follows. That is, the grating anti-theft device according to the present invention installs a grating in which the main bar is formed with at least a web and a lower flange protruding from the lower end of the main bar to both sides in the thickness direction, in the upper part of a groove or a box, and A pair of clamping pieces and a bolt for tightening the clamping pieces are attached to the other end of the chain, one end of which is fixed to the inner surface of the groove or box.
The clamp hardware is attached to the main bar in such a way that the clamping piece straddles the lower flange and clamps the web of the main bar by tightening the bolt and nut. It is characterized by

[Effect]

According to the above configuration, since the clamping piece straddles the lower flange of the main bar and clamps the web,
When lifting the grating from above the groove or box, if slipping occurs between the clamping piece and the web due to insufficient tightening of bolts and nuts, the clamping piece will get caught on the lower flange, and the main bar will be shortened. Since it does not come off, it has an anti-theft function.

In addition, since the clamping piece straddles the lower flange of the main bar and clamps the web, it can be attached to any main bar within the length of the chain, and at any position in the longitudinal direction of the main bar. Clamp hardware can be attached.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 3 show an embodiment of the present invention.
In FIG. 1, 1 indicates a plurality of main bars 2...
It is a grating of a known structure in which the upper surface is formed in a rectangular lattice shape with the top surface flush with the side plates 4, 4, etc. arranged at both longitudinal ends of the cross bar 3... and the main bar 2... It is installed in receiving frames 6, 6 buried in the upper part of side wall concrete 5a, 5a. 7... is a receiving frame anchor.

The main bar 2, as shown in its cross-sectional shape in FIG. 2, is made of I-beam steel and includes a web 2a, and an upper flange 2b and a lower flange 2c protruding from the upper and lower ends of the web 2a to both sides in the thickness direction. ing.

The anti-theft device of the grating 1 is constructed as follows.

That is, as shown in FIG. 1, a clamp hardware A is attached to the other end of a chain 9 whose one end is fixed to the inner surface of the groove or box 5, for example, to the side wall concrete 5a with an anchor 8.
are connected. As shown in FIGS. 2 and 3, this clamp hardware A includes a pair of clamping pieces 10, 10 whose upper ends are bent inward and both clamping pieces 10,
A connecting piece 11 that connects the lower ends of the main body 12 is made by bending a steel plate, etc., a tightening bolt 13 is inserted into opposing positions of the clamping pieces 10, and a tightening bolt 13 is screwed into the connecting piece 11. A fitting nut (in the drawing, it is shown as a double nut, but only one nut may be used) 14, and by tightening the bolt 13 and nut 14, the holding pieces 10, 10
is attached to the main bar 2 so as to straddle the lower flange 2c and sandwich the web 2a. All the main bars 2... have the same cross-sectional shape, and the web 2a is held between the holding pieces 10, 10, so that within the length of the chain 9,
The clamp hardware A can be attached to any main bar 2 and at any position in the longitudinal direction of the main bar 2. The side wall concrete 5a of the trench or box 5 may be made of cast-in-place concrete or precast concrete. Further, as shown in the figure, the anchor 8 may be of the type that is embedded during concrete pouring, or may be of the type that is embedded after the concrete has hardened, such as a hole-in anchor or a chemical anchor.

FIG. 4 shows another embodiment of the invention. In this embodiment, a pair of clamping pieces 10 whose upper ends are bent inward,
10 is pivotally connected by a pin 15 so as to be slidable and openable, and a bolt 13 and a nut 14 for tightening the clamping pieces are arranged in a portion of the clamping pieces 10 extending downward from the pin 15. Therefore, it constitutes a clamp hardware A, and is characterized in that the other end of the chain 9 is connected to the bolt 13. The rest of the configuration is the same as the previous embodiment, so the explanation will be omitted.

Incidentally, in the grating 1 shown in FIG. 4, the main bar 2 has a web 2a and upper and lower flanges 2b, 2c.
The main bar 2 is made of H-shaped steel, the cross bar 3 is made of flat steel, and reinforcing members 16 are arranged parallel to the main bar 2, making it suitable for heavy loads. However, it may have a cross-sectional shape as shown in FIG. That is, the present invention can be applied to any main bar 2 that includes at least a web 2a and a lower flange 2c, and is not necessarily required for the upper flange 2b.

[Effect of idea]

Since the present invention has the above-described configuration, it can achieve the following effects.

(1) The chain is connected to the grating, that is, the clamp hardware is attached by tightening bolts and nuts so that the clamping piece straddles the lower flange of the main bar and clamps the web. It does not require any processing and is economical.

(2) Since the chain can be connected to any main bar or at any position in the longitudinal direction of the main bar, it is possible to bury one end of the chain in the inner surface of the groove or box, or to place it in a predetermined position. When constructing a trench by installing a precast concrete U-shaped block with an anchor buried in the ground, it is necessary to consider the positional relationship with the steel bar welded between the main bars, as in the conventional method. This makes it easier to install anchors, etc., and it also makes it easier to change the grating layout during construction.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a longitudinal sectional side view of the grating anti-theft device, FIG. 2 is a longitudinal sectional front view of the main part, and FIG. 3 is a partially cutaway side view of the main part. FIG. 4 is a perspective view of essential parts of a grating anti-theft device showing another embodiment of the present invention. FIG. 5 is a partially cutaway perspective view showing a conventional example. A... Clamp hardware, 1... Grating, 2
... Main bar, 2a ... Web, 2c ... Lower flange, 5 ... Groove or box, 9 ... Chain, 10 ... Clamping piece, 13 ... Bolt, 14 ... Nut.

Claims (1)

[Scope of utility model registration request] A chain in which a grating in which a main bar is formed with at least a web and a lower flange protruding from the lower end of the main bar to both sides in the thickness direction is installed in the upper part of the groove or box, and one end side is fixed to the inner surface of the groove or box. A clamp hardware is connected to the other end side, and includes a pair of clamping pieces and bolts and nuts for tightening the clamping pieces, and the clamping piece is configured to straddle the lower flange by tightening the bolts and nuts. A grating anti-theft device, characterized in that the device is attached to the main bar so as to sandwich the web of the main bar.