JPS6011179Y2 - Blocking structure of square iron lids in manholes, fire hydrant protection cases, etc. - Google Patents

Description

[Detailed description of the invention] Conventionally, the closing structure of the iron lid for opening and closing the opening of a protection source such as a fire hydrant installed underground has been constructed using a locking lid that protrudes below the inner peripheral surface of the opening. Since the outer periphery of the back side of the iron lid was simply placed on the step, the iron lid would shake and make a metallic sound every time a car passed over the iron lid, causing noise pollution. It was also a cause.

Therefore, the present invention aims to solve the above-mentioned problems and provide a closed structure for a rectangular iron lid that can completely prevent the generation of noise.

The present invention has a rectangular opening 2 provided on the top surface of the protective cylinder body 1.
A square iron lid 3 is placed on each inner circumferential surface a, a', a'', a''' of
A pair of outer circumferential surfaces b', b", b"' located on opposite sides of each outer circumferential surface of the square iron lid 3 is provided with a slope to support it from below. are a pair of inner circumferential surfaces of the rectangular opening 2 facing these outer circumferential surfaces, and these inner circumferential surfaces a over substantially the entire length of a/.

The remaining pair of outer circumferential surfaces b'' located on opposite sides of the square iron lid 3 are provided with slopes to be in surface contact with a′ respectively.
, b″′ has one of the square openings 2 facing these outer peripheral surfaces.
A closed structure of a rectangular iron lid for a manhole, a fire hydrant protection source, etc., characterized in that only the end portions of the pair of inner peripheral surfaces a'', a'' are sloped so as to make surface contact with these inner peripheral surfaces. This is related.

Note that the areas where each inner circumferential surface of the opening 2 and each outer circumferential surface of the iron lid 3 are in surface contact with each other are precisely finished so that all the contact surfaces of these parts are in close contact at the same time. shall be taken as a thing.

In addition, 4 in the figure is resin concrete colored in a conspicuous color such as yellow, which is filled in a groove 5 bored on the upper surface of the outer periphery of the opening 2 of the protective cylinder main body 1. This serves to quickly find the installation location, and by filling the groove with resin concrete colored in a conspicuous color, the color can be maintained for a long period of time.

Reference numeral 6 denotes an annular groove bored on the outer periphery of the protection tube body 1, and this groove is used to firmly connect the root wrapping concrete 7 to the outer periphery of the protection tube body 1.

Reference numeral 8 indicates a reinforcing rib for the annular groove 6, and reference numeral 9 indicates a crowbar insertion hole for opening the iron lid 3.

According to the present invention, sloped surfaces provided on a pair of inner circumferential surfaces located on opposite sides of each inner circumferential surface of the square opening, and a square iron lid facing each of these inner circumferential surfaces, are provided. The square iron lid is supported from below with a strong supporting force through wide surface contact with sloped surfaces provided along the entire length of the pair of outer peripheral surfaces on opposite sides, so that when the iron lid is closed, The iron lid is supported in an extremely stable state, and does not move at all when a car or the like passes over its top surface.In addition, the iron lid is supported by sloped contacts at both ends of the remaining pair of outer peripheral surfaces of the iron lid. Because of the surface, horizontal movement is completely prevented, thus preventing the generation of noise.Moreover, among the outer circumferential surfaces of the square iron lid, the remaining pair of outer circumferential surfaces located on opposite sides are Since the structure is configured such that only the two end surfaces of the square opening come into surface contact with the pair of inner circumferential slopes facing the outer circumferential surface, when the iron cover is opened, the entire outer circumferential surface of the iron cover touches the inner circumference of the opening. It can be easily opened without requiring a large amount of force unlike when it is in close contact with a surface.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view taken along the line II in FIG. 1: Protective cylinder body, 2: Square opening, 3: Square iron lid, H,
a', a", a": each inner peripheral surface of the square opening, b, b
', b", b"'Each outer peripheral surface of the diagonal iron lid.

Claims (1)

[Claims for Utility Model Registration] Each inner peripheral surface a, a', a'', a'' of the rectangular opening 2 provided on the upper surface of the protective cylinder main body 1 is provided with a rectangular iron lid 3 for supporting it from below. Each outer peripheral surface of the square iron lid 3 is sloped,
b', b', b'', a pair of outer circumferential surfaces located on opposite sides, b' has a pair of inner circumferential surfaces a of the square opening 2 facing these outer circumferential surfaces, respectively. Along with applying slopes that should make surface contact with these inner circumferential surfaces over approximately the entire length, the remaining pair of outer circumferences located on opposite sides of the square iron lid 3 //, bIII are provided with a slope that makes surface contact with these inner circumferential surfaces, respectively. In a manhole, a fire hydrant protection source, etc., the inner peripheral surfaces a'', a''' of the opposing square openings 2 are sloped so as to be in surface contact with the inner peripheral surfaces only at both end portions. Closed structure with square iron lid.