JPS5917974Y2 - Burr hole structure for underground structure lids - Google Patents

Description

[Detailed explanation of the invention] This invention relates to the crowbar hole structure of the iron manhole cover.
For details, see ■Manholes for sewer pipes, power pipes, electricity, and communication pipes, ■Fire hydrants, air valves, gate valves, and stop valve boxes for water pipes, and water meter boxes, ■Massage boxes for gas pipes. Various valve boxes,
This relates to a structure to prevent rainwater from flowing into a crowbar hole provided in a lid used for underground structures such as

Generally, there are several gaps and openings between the manhole and the iron cover, such as the gap between the receiving frame and the cover, crowbar holes, hook holes, etc., and if rainwater infiltrates from these places, it will leak into the underground structure. This will have a negative impact on the facility.

Therefore, it is necessary to take measures to prevent rainwater from flowing in through these gaps and openings.

Several proposals have been made regarding means for blocking rainwater flowing in through crowbar holes and hook holes, but all of them have complex mechanisms or are too simple. The desired effect could not be expected.

That is, the one shown in FIG. 1 is one of the conventional examples, and this hook hole closing means 04 is for closing the hook hole 02 with a stopper 041 by the action of a weight 043 attached to a punch 042. However, in this case, the attachment of the hammer and the like was complicated, and the entire mechanism was not strong, so it was easily damaged if handled roughly.

In addition, regarding the gap between the receiving frame and the lid, in recent years, in order to prevent looseness, the joining surfaces of the two have been processed and finished so that they are brought into close contact with each other with a tapered surface, so that there is almost no intrusion of rainwater from this gap. ing.

The present invention has been made to solve the problems of the conventional burl hole blocking means mentioned above and to respond to new technical trends, and provides a new blocking means for preventing rainwater from flowing into burl holes. The purpose is to

Hereinafter, the present invention will be explained based on the drawings.

2 to 4 show an embodiment of the present invention, in which 1 is a round or square lid, the edge surface of which is supported in conformity with the tapered surface of the inner surface 31 of the receiving frame 3. Therefore, the lid 1 and the receiving frame 3 are in close contact with each other, and there is no wobbling of the lid 1.

Reference numeral 2 denotes a crowbar hole mechanism for preventing the inflow of rainwater, which is provided on the edge of the lid 1 and constitutes the main part of the present invention, and has the following configuration.

Reference numeral 20 denotes a crowbar hole, which is cut into the edge of the lid 1 in the shape of a horseshoe groove.

A rainwater receiving part 23 extends in a bag shape surrounding this burl hole 20 and holding a burl tip accommodating part 24 from the lower surface of the lid 1.

The front end surface of this rainwater receiving part 23 leaves a crowbar hole groove,
The entire surface is processed into a tapered surface that continues with the slope of the edge surface of the lid 1, and is in watertight contact with the inner surface 31 of the receiving frame.

A sand discharge hole 22 is bored at the rear end of the rainwater receiving section 23 so as to be continuous with the bottom and open into the manhole.

A closing spring plate 21 made of a stainless steel plate, a plastic plate, or the like elastically closes this sand discharge hole 22 from the rear rear surface of the rainwater receiving portion 23.

Numeral 211 is a bolt that attaches the closing spring plate 21 to the back of the lid 1, and when an external force is applied, the closing spring plate opens downward.

The usage of the lid with a rainwater inflow prevention mechanism for the crowbar hole of the present invention is as follows.

During rain, since the lid edge end face and the inner surface of the receiving frame are in close contact with each other, rainwater does not enter from between them, but only from the crow hole 20.

However, the rainwater receiving part 23 has a bag shape, and its front end surface is in contact with the inner surface of the receiving frame, and the sand discharge hole 22 provided in the deep part thereof is closed by the closing spring plate 21, so that the rainwater flowing in The rainwater only collects in the rainwater receiving part 23 and has no place to go, and any more rainwater will overflow from the crowbar hole 20.

Moreover, since the space of the rainwater receiving part 23 has a minimum capacity enough for the tip of the crowbar to be inserted, the rainwater immediately fills up and overflows.

As a result, rainwater will not flow into the manhole.

When the weather is sunny, the water accumulated in the rainwater receiving section 23 quickly evaporates and dissipates, leaving the inside in a dry state.

Next, when raising the lid with a crowbar, the tip of the crowbar is inserted into the crowbar tip accommodating part through the crowbar hole 20, but if there is dirt accumulated here, the crowbar tip can be used to add dirt and sand. The blocking spring plate opens a sand drainage hole, and all accumulated sediment falls into the manhole through the sand drainage hole.

Therefore, there is no accumulated sediment in the rainwater receiving part 23, and the tip of the burl can be easily inserted into the burl hole 20 at all times.

Since the burl hole 20 is provided at the outermost edge of the lid, a large moment can be taken, and even a heavy lid can be easily lifted and opened.

Although the configuration of the present invention is as described above, various design changes can be made without departing from the technical idea of the present invention.

As mentioned above, since the rainwater inflow prevention mechanism of the crow hole in the cover for underground structures of the present invention has the above-mentioned configuration and usage mode,
It has the following various superior effects compared to conventional ones.

■ It has a simple structure, is sturdy, and can reliably prevent rainwater from entering.

- In addition to the lid that prevents rattling, good water retention can be achieved by bringing the front end of the rainwater receiving part into close contact with the tapered surface of the receiving frame.

■ Since the crowbar hole is provided on the edge of the lid, even if the lid becomes large and heavy, a large moment can be taken, and the lid can be easily lifted and opened.

■ In case of a blockage due to sediment, just a light poke will open the blocking spring plate and drain the accumulated sediment.

After sand removal, the closing spring plate can automatically and reliably close the sand removal hole due to its elasticity.

- Since the space formed by the rainwater receiving section is only the crowbar tip accommodating section, the capacity can be made as small as possible and the evaporation of rainwater can be promoted.

■ The blocking spring plate can be replaced, and as long as the spring plate is renewed due to deterioration, the rainwater inflow prevention function can be maintained for a long period of time.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, and Figs. 2 to 4 show an embodiment of the present invention, in which Fig. 2 is a partially cutaway sectional view, Fig. 3 is a detailed sectional view, and Fig. 3 is a detailed sectional view. FIG. 4 is a sectional view taken along the line X--X in FIG. 3.

Claims (1)

[Claims for Utility Model Registration] (1) In the cover 1 for underground structures, which has an edge surface that coincides with and comes into close contact with the tapered surface of the inner surface 31 of the receiving frame 3, a crowbar hole 20 is provided in the shape of a notch in the edge of the cover 1. A rainwater receiving part 23 that surrounds the burl hole 20 in a bag shape and has a burl tip accommodating part inside is integrally extended from the back surface of the lid 1, and a sand drainage hole 22 is provided at the rear end of the inner part of the rainwater receiving part 23. is drilled,
A crowbar hole rainwater inflow prevention mechanism 2゜2, in which a closing spring plate 21 closes the sand drainage hole 22 from the outside back of the rainwater receiving part 23, and the lid 1 is an iron lid, Claim 1 of the Utility Model Registration Claim Mechanism to prevent rainwater from flowing into the crowbar hole described.