JPH0754368A - Cover for underground buried construction - Google Patents

Abstract

PURPOSE:To improve the sealing performance of a frame body and a valve cover by installing in such a way that the tip of a key hole closing valve cover rotatably journalled to the back face does not interfere with the frame body at the rotating time, and mounting packing on a valve seat. CONSTITUTION:It is so constituted that the tip of the valve seat 10 of a valve cover 1a rotated around a pivot 1b at the lower face of a cover body (a) so as to close the key hole 2 of the cover body (a) is positioned lower than a horizontal line L passing the center point of the pivot 1b and that the end part of the valve cover 1a does not interfere with a frame body (b). Packing 12 is mounted on the valve seat 10 in the state of being held by a keep plate 11, and a valve body 1 provided with a weight 1c is energized by a coil spring 3 so that the engaging piece 1d of the valve body 1 is locked to the engaging piece b' of the frame body (b) even in the case of the frame body (b) being buried in the inclined land. At the time of opening the cover body (a), a hook bar is inserted in the key hole 2 to rotate the valve body 1 against the force of the spring 3, and the tip part 1a' of the valve cover 1a is rotated gradually away from the inner wall of the frame body (b). The sealing performance of the cover can be thereby improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for an underground buried object provided in a room for an underground buried object such as a water shutoff valve, and more particularly to a lid suitable for being buried in a sloping ground.

[0002]

2. Description of the Related Art Conventionally, a lid of a lid for an underground buried object of this type is provided with a key hole into which a hook bar is inserted when the lid is opened. In addition, the keyhole is normally closed by inserting the valve lid of the valve body provided on the lid body and preventing the lid body from being opened carelessly. A locking mechanism is provided.

A conventional valve body will be described with reference to FIG.
The valve body 1 is provided with a valve lid 1a to be inserted from below into a keyhole 2 provided in a part of the periphery of the lid body a.

That is, the valve body 1 is L-shaped, has a valve lid 1a at one end, and has a central portion pivotally supported by a support shaft 1b on the back side of the lid a and the other end. The portion is provided with a weight 1c and an engaging piece 1d which is engaged with a locking piece b'provided on the frame body b. Therefore, the valve body 1 is always kept by the weight 1c.
a can be placed in the keyhole 2, and
The locking piece b'and the engaging piece 1d can be engaged with each other. Further, when a hook bar (not shown) is inserted into the keyhole 2, it can be rotated about the support shaft 1b to allow the insertion of the hook bar.

[0005]

However, in the above-mentioned conventional underground lid, the tip position of the valve lid is above the horizontal line passing through the center point of the support shaft, and is above the valve lid position on the horizontal line. Since it is separated from the valve lid, there is a drawback that a recess is provided in the inner wall of the frame or a large gap is required between the frame and the valve lid in order to allow the valve lid to rotate.

Explaining further with reference to FIG. 2, the tip position a of the valve lid 1a is a horizontal line L passing through the center point of the support shaft 1b.
Above the horizontal line, and its tip position a is the horizontal line L
It is farther from the support shaft 1b than the upper valve lid 1a. Therefore, in order to allow the valve body 1 to rotate about the support shaft 1b, a locus in which the tip portion a can rotate is required,
A recess b ″ is required on the inner wall of the frame body b. When this recess b ″ is not provided, that is, the inner wall surface of the frame body b is shown in FIG.
When it is set as indicated by the chain line, the position of the tip end a must be brought closer to the support shaft 1b side. However, in this case, a large gap is created between the valve lid 1a and the frame body b.

[0007] In particular, when the gap becomes large, water, mud and sand fall into the manhole and underground structures from the gap,
They increased water and polluted manholes and underground structures, losing their functions and burdening their treatment capacity. Furthermore, from the gap, harmful gas in the underground structure,
A foul odor was emitted and could pollute the environment.

Therefore, the present invention has been made in order to solve the above-mentioned drawbacks, and an object thereof is to provide a gap between the frame body and the valve lid without providing a concave portion in the frame body. In other words, it is to provide a lid for an underground buried object that can improve hermeticity.

[0009]

In order to achieve the above-mentioned object, a lid for an underground buried object according to the present invention is rotatably supported by a back surface of a lid body, and one of the two is centered around the support shaft. At the end,
In an underground buried object lid having a valve body having a valve lid that is inserted into a keyhole provided in the lid body and covers the keyhole,
The tip position of the valve lid is characterized by being below the position of a horizontal line passing through the center point of the support shaft. In addition, it is characterized in that an engaging piece that engages with an engaging piece provided on the frame is provided at the other end portion. Further, the valve lid is provided with packing.

[0010]

In the above structure, when the valve body rotates about the support shaft, the tip end position of the valve lid moves toward the inside of the main body. Further, when the valve lid covers the key hole, the engagement piece of the valve body and the locking piece of the frame body engage with each other to maintain the locked state. In addition, the keyhole is covered by the valve lid packing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a keyhole portion of an underground buried object lid according to an embodiment. It should be noted that the same components as those of the above-described conventional device will be described using the same reference numerals.

The valve body 1 is rotatably supported by a frame on the back surface of the lid body a by a support shaft 1b, and has one end portion in the same manner as in the conventional case.
A valve lid 1a is provided which is inserted into the keyhole 2 provided in the lid a from the lower side and is formed in a size to cover the keyhole 2.

When the valve lid 1a covers the keyhole 2 (see the state of FIG. 1), the upper surface of the valve lid 1a is the spindle 1b.
A valve seat 10 having the same plane as a horizontal line L passing through the center point of
It is placed on this valve seat 10 and is pressed by a pressing plate 11 from above.
It is composed of a packing 12 made of synthetic rubber fixed to 0 and a screw 13 for screwing the pressing plate 11 to the valve seat 10. The packing 12 has a trapezoidal shape,
The tip a is in contact with the inner wall of the frame body b, and the upper surface opposite to the tip a is in contact with the lower surface of the lid a.

A weight 1c is provided at the end portion of the valve body 1 as in the conventional case, and the frame 1b side of the weight 1c extends to the inner peripheral wall of the frame b and extends upward.
d is provided.

The weight of the weight 1c is determined so that the valve lid 1a can rotate toward the keyhole 2 when the lid a is kept horizontal.

A downward locking piece b'is provided on the inner peripheral wall of the frame body b facing the engagement piece 1d of the valve body 1, and when the valve lid 1a is located in the keyhole 2, , Both pieces 1d,
The b'is engaged so that the lid a can be kept in a locked state.

A pair of foot portions of a coil spring 3 are screwed to the valve body 1 on the side opposite to the valve lid 1a with the support shaft 1b as the center. The top of the coil spring 3 is in contact with the back surface of the lid a. Further, the valve body 1 that contacts the coil spring 3
Is provided with a recess 1e, which forms an escape when the coil spring 3 is bent.

When the underground buried object lid having the above construction is buried in the horizontal ground G, the valve lid 1a is inserted into the keyhole 2 by the weight 1c in a predetermined manner. At this time, the keyhole 2 is kept sealed by the packing 12. Even in this case, the coil spring 3 may urge the valve lid 1a toward the keyhole 2 side.

By the way, when the underground buried object lid is buried in a sloping ground, if there is no coil spring 3, the weight 1c
The valve lid 1a is disengaged from the keyhole 2 and the engagement piece b'and the engagement piece 1d are disengaged from each other due to the gravity, but the valve spring 1a is urged toward the keyhole 2 side by the action of the coil spring 3. , The keyhole 2 can be covered as desired. Moreover, both pieces 1
The engagement of d and b'will not be disengaged, and the locked state can be maintained.

When the lid a is opened, a hook rod (not shown) is inserted into the keyhole 2. At this time, the valve body 1 rotates counterclockwise around the support shaft 1b against the coil spring 3. . During this rotation, the tip a of the valve lid 1a gradually enters the frame b, that is, moves away from the inner wall of the frame b. Need not be provided. Further, at this time, the coil spring 3 bends, but the bend is effectively absorbed by the depression 1e, and the valve body 1 is smoothly rotated.

By rotating the valve body 1, the engagement between the two pieces 1d and b'is released, and the lid a can be removed from the frame b.

In the above embodiment, the upper surface of the valve seat 10 is located at the same position as the horizontal line L, but it may be located below the horizontal line L.

[0023]

In the lid for underground buried object according to the present invention, since the tip position of the valve lid is below the horizontal line position passing through the center point of the support shaft, it is possible to provide the inner wall of the frame body with no recess, or the frame body. The valve body can be rotated without providing a gap between the valve lid and the valve lid. Further, when the engagement piece is provided on the valve body and the engagement piece is provided on the frame body, the lock mechanism can be formed by both pieces. Furthermore, when packing is provided on the valve lid,
The keyhole can be closed in a watertight manner.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a keyhole portion of a cover for an underground buried object according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional lid for an underground buried object.

[Explanation of symbols]

 a lid body b frame body b'locking piece 1 valve body 1a valve lid 1b spindle 1c weight 1d engaging piece 1e recess 2 keyhole 3 coil spring 10 valve seat 11 retainer plate 12 packing 13 screw

Claims (3)

[Claims] 1. A valve lid which is rotatably supported by a back surface of a lid body and which is inserted into a key hole provided in the lid body at one end centering on the pivot shaft to cover the key hole. In the underground buried object lid having a valve body having, the tip position of the valve lid is below the position of a horizontal line passing through the center point of the support shaft. 2. The lid for the underground buried object according to claim 1, further comprising an engaging piece that engages with an engaging piece provided on the frame body at the other end. 3. The lid for an underground buried object according to claim 1, wherein the valve lid is provided with packing.