JPH0527550Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an installation structure for a grating having a large number of ventilation holes that is placed on approximately the same plane as the ground surface over an opening that faces the ground surface, such as the entrance or exit of a tunnel or underground hole.

(Prior Art) Recently, utility poles have been removed from urban streets to beautify them, and electric cables and the like have been placed underground. Therefore, there were many manholes and handholes on the road,
There are many gratings in the openings of it.

This grating consists of a large number of crosspieces placed at intervals within a rectangular iron frame, and the surfaces of these crosspieces are processed by hot-dip galvanizing.

(Problem that the invention aims to solve) However, these hot-dip galvanized gratings have a silvery color, which does not blend in well with road surfaces and cityscapes. In particular, many of the sidewalks in newer streets are tiled, and the galvanized grating installed there detracts from the aesthetics.

Therefore, it is possible to paint these gratings in color, but it would be time-consuming to paint them each time.

(Means for solving the problem) This idea uses colors that harmonize with the surrounding colors.
The goal is to solve the above problems by creating gratings using weather-resistant steel that retains the rust color of iron.

This weather-resistant steel material contains Cu, P, Cr,
It is a low-alloy steel with weathering elements such as Ni added, and the rust that forms becomes stable rust, which has the characteristic that corrosion of the iron hardly progresses thereafter. The formation of stable rust is possible under conditions such as when weather-resistant steel is exposed to sunlight, appropriate rainfall, and the surface of the steel is exposed to the atmosphere, and when rainwater and dirt are exposed to the surface of the steel over a long period of time. It is not good if it sticks to the surface.

Therefore, this idea consists of a grating made of weather-resistant steel that is placed on both side steps of an opening such as an underground hole to close the opening. This is done by using multiple abutting parts that are spaced apart, and these abutting parts are formed by providing multiple notches at intervals along the lower edge of both sides of the grating, or when the grating is In some cases, a plurality of abutting bodies separately provided at intervals are interposed between the flat portions of the step portions on both sides.

(Function) Because this grating is installed at the opening of a tunnel or handhole, it is exposed to outside air, sunlight, and rainwater. Moreover, since the step part of the opening and both sides of the grating come into contact with each other through multiple abutting parts provided at intervals, rainwater, dust, dirt, etc. that have entered between the grating and the step part will be absorbed between these contact parts. It flows through the gap into the underground hole or handhole and does not accumulate between this step and the grating. Therefore, the weathering steel material that forms this grating produces stable rust, resulting in a grating covered with a rust color.

(Example) An example of this invention will be described below with reference to the drawings.
In FIGS. 1 and 2, 1 is a quadrilateral opening such as an underground hole, 2, 2 are stepped portions provided on the left and right opposite edges of this opening 1, and 3 are steps 2 on both sides of these openings. 2, a grating that covers the opening 1; 4, 4 are the left and right end plates placed on each step 2 of the grating 3; 5, 5 are the front and rear ends of these left and right end plates 4, 4; Grating 3 handed to me
The left and right end plates 4, 4 and the front and rear end plates 5, 5 constitute a quadrilateral outer frame of the grating 3, and a large number of crosspieces are arranged at intervals within this quadrilateral outer frame. It is provided. Reference numeral 6 denotes a large number of semicircular holes provided at intervals on the lower edge of each of the left and right side end plates 4, and 7 indicates an abutment piece formed between each of these semicircular holes 6. The lower end of 7 is in contact with the flat surface of each step portion 2 . 8, 8 are the front and rear end plates 5,
This is a notch formed by diagonally cutting the lower edges of the left and right end plates 4, 4 of the front and rear end plates 5, 5 to prevent the lower edges of the front and rear end plates 5, 5 from coming into contact with the flat surface of the stepped portion 2.

Figures 3 and 4 show another embodiment of this invention, in which both sides of a grating 3' made of weather-resistant steel are placed on both side steps 2, 2 of an opening 1 of an underground hole, etc. However, the left and right end plates 4' on both sides,
A large number of abutting bodies 9 are interposed at intervals between the lower edge of the step 4' and the flat surface of each step 2, and the grating 3 is placed on these abutting bodies 14. be.

In these embodiments, only the contact pieces 7 or the contact bodies 9 provided at intervals are in contact with the contact portions between each step portion 2 and the grating 3, so that the contact portion between each of the contact pieces 7 is Alternatively, gaps are created between the abutting bodies 9, and rainwater, dirt, and dust that enter the flat surface of each step 2 from between the grating 3 and each step 2 flow into the opening 1 through these gaps. , rainwater, dirt, and dust do not accumulate in each step 2. In addition, only each contact piece 7 or each contact body 9 is in contact with each step portion 2, so that the contact portion is made as small as possible and is susceptible to repeated drying and wetting in the atmosphere.

In addition, when multiple gratings of this invention are arranged and connected to each other with hinges, one end of the grating may be connected with a hinge to the opening of an underground hole to make the grating open and close, but in that case the hinge is also made of weather-resistant steel. Use.

FIG. 5 shows gratings 3a and 3b of the above embodiment.
These gratings 3a and 3b are shown connected by a hinge 10, which is made of weather-resistant steel and fixed to one end of one of the gratings 3a, as shown in FIG. A stainless steel round rod 13 is inserted loosely into a tube body 12 made of weather-resistant steel and fixed to one end of the tube body 11 and the other grating 3b.
A Teflon pipe 14 is interposed between the inner circumference of the round bar 13 and the outer circumference of the round bar 13. By interposing this smooth Teflon pipe 14, electrolytic corrosion of the tube bodies 11 and 12 made of weather-resistant steel is prevented. and can maintain stabilization of surface rust.

(Effect of the invention) This invention has the above structure, including underground holes, tunnels,
Since the contact between the steps on both sides of an opening such as a hand hole and both sides of the grating is carried out by a plurality of abutting portions provided at intervals, the step between the steps of the opening and the end of the grating is The grating, which is made of weather-resistant steel, is exposed to outside air, sunlight, rainwater, etc. and repeatedly dries and wets, forming stable rust.

Therefore, with this idea, if grating made of weather-resistant steel is installed at the openings of underground holes or hand holes in roads etc., it will develop a natural color and become a subdued rust color, blending in with the surrounding tiled sidewalks. This saves you the trouble of painting each time.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of this device, Fig. 2 is a cross-sectional side view of the same, Fig. 3 is a cross-sectional front view of another embodiment of this device, Fig. 4 is a cross-sectional side view of the same, and Fig. 5 is a cross-sectional side view of the same. FIG. 6 is a cross-sectional front view showing a state in which a plurality of gratings of the invention are connected by a hinge, and FIG. 6 is a partially cutaway perspective view of the hinge shown in FIG. In the figure, 1 is an opening, 2 is a step, 3 is a grating, 4 is a left and right end plate, 5 is a front and rear end plate, 7 is a contact piece, 9 is a contact body, and 10 is a hinge.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A grating is constructed of weather-resistant steel material, and the grating is placed on both sides of the opening of an underground hole etc. to close the opening, and A grating installation structure characterized in that contact with the grating is made by a plurality of contact parts provided at intervals. (2) Utility model registration claim (1) characterized in that the plurality of abutting portions are formed by providing a plurality of notches at intervals along the lower edge of both sides of the grating. Installation structure of grating as described in section. (3) Registration of a utility model characterized in that the plurality of abutting parts are formed by interposing a plurality of abutting bodies at intervals between the lower edges of both sides of the grating and the horizontal parts of each step on both sides. A grating installation structure according to claim (1).