JPH0726433Y2 - Lid for underground construction - Google Patents

Description

[Detailed description of the device]

[0001]

[Field of Industrial Application] The present invention is mainly used for underground waterworks, pipes for gas, electricity, communication, etc., manholes and handholes provided at connection parts of wiring, and various types attached to these. The present invention relates to a lid provided in an opening of an underground structure such as a valve housing accommodating a valve, a fire hydrant, or the like, particularly, a rectangular lid.

[0002]

2. Description of the Related Art Conventionally, a cover made of cast iron and a receiving frame are provided in the above-ground openings of manholes and various valve casings, which are underground structures, in order to inspect and operate valves provided inside. The square lid is used for valve casings, etc., but these underground structures are often installed on roads and vehicles pass over the lid plate, so pebbles etc. When it is sandwiched between the receiving frames, rattling noise is generated. For this reason, a rectangular lid plate is divided into two by diagonal lines so that two lid plates forming a substantially right triangle are combined to form a square, which is a so-called 3
It has been constructed to prevent noise as a point support.

[0003]

As described above, when a rectangular lid is used for the lid of the underground structure, two right-angled triangular lid plates obtained by cutting the rectangle at one diagonal are used in combination to reduce noise. I have prevented it, but the two lid plates are bolts,
When connecting with nuts, the bolt insertion hole is made larger than the thickness of the bolt, the lid plates are connected so that they move relative to each other, and the rectangular receiving frame has each side parallel or parallel to the road direction. They are installed so that they intersect at right angles. Therefore, when the vehicle passes over the lid plate, one lid plate forming a right triangle contacts the receiving frame at any side sandwiching the right angled top, and the force applied from the vehicle is applied to the receiving frame at the side, The force of the other lid plate is applied to the hypotenuse of the lid plate, and the force is applied to the hypotenuse of the lid plate in contact therewith, so that the force acts in the direction of the hypotenuse. The force is one apex that forms an acute angle of a right triangle. The top part of the lid plate may bite into the receiving frame for a long period of time, and the leg surface contacting the receiving frame provided on this top part may be worn, resulting in a step. It turned out, and this has come to call for measures.

[0004]

[Means for Solving the Problems] The present invention has been made as a result of various investigations in order to solve such a problem, and is made up of two lid plates obtained by dividing a rectangular lid plate in two by diagonal lines thereof and a receiving frame. In the lid for an underground structure, the problem can be solved by providing a protrusion and a recess into which the protrusion fits on the sides where the two cover plates are in contact with each other.

It should be noted that it is advisable to provide at least one projection and recess at a position symmetrical with respect to the midpoint of the opposite sides, and in general, since the marking is often cast in the central part, it is close to both ends of the side. Should be installed in

[0006]

The projections and the recesses provided on the sides of the two cover plates that are in contact with each other are fitted to each other, and have the function of preventing the sides from shifting.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the drawings. As shown in FIG. 1, the lid plate fitted and carried in the opening portion of the rectangular receiving frame (3) has a square shape with one diagonal line of the square shape.
It consists of two separated right and left triangular triangular lid plates (1) and (2), which are joined by using the ribs formed on the back surface with bolts (7) and nuts (8), and each lid plate (1), (2) are constructed to be supported on each other by three tops each and are generally made of cast iron.

The center point (4) of the sides where the lid plates (1) and (2) are in contact with each other
In a more symmetrical position, one recess (6) into which each protrusion (5) fits is provided.

FIG. 2 shows another embodiment. In FIG. 1, one protrusion (5) or recess (6) is provided near both ends in FIG. 1, but in FIG. 2 it is next to the protrusion (5). Indentation (6) with which the protrusion fits
Is provided so as to be meshed with each other.

The projections (5) and the depressions (6) are not particularly limited in terms of their shapes, so that their opposing sides do not deviate from each other, but they are preferably shaped like teeth of a gear.

[0011]

Since the present invention is constructed as described above, for example, when a force is applied to the cover plates (1) and (2) in the direction of arrow A in FIG. Touch the receiving frame (3) with
In (1), the force is applied to the side of the cover plate (2) that is applied in the direction of arrow B, and the side is slanted. The plates (1) and (2) have the projections (5) and the recesses (6) fitted together, so there is no risk of displacement
There is no risk of (9) getting into the receiving frame (3).

[Brief description of drawings]

1 is a plan view

FIG. 2 is a partially enlarged plan view showing another embodiment.

[Explanation of symbols]

 1, 2 Lid plate 3 Receiving frame 4 Center point 5 Protrusion 6 Recess 7 Bolt 8 Nut 9 Top

Claims (1)

[Scope of utility model registration request] 1. A lid comprising two lid plates (1), (2) and a receiving frame (3) in the shape of a right triangle divided into two by one diagonal of a square, the lid plates (1), ( A lid for an underground structure, characterized in that at least one protrusion (5) and at least one depression (6) into which the protrusion (5) fits are provided on the sides where the two (2) are adjacent to each other.