JP2002138505A - Waterproof device for lid of underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rainwater or the like from intruding from a keyhole of a lid element into an underground structure. SOLUTION: A waterproof device for an underground structure comprises a frame element and a lid element, a keyhole is equipped on a fringe of the lid element and a valve element is pivoted on a backside of the lid element so as to be swingable, a lid of the valve is equipped on one end of the valve element and a weight on the other end, the lid of the valve goes in and out of the keyhole by swing of the valve element. Further, the waterproof device comprises a valve seat of which the lid of the valve is equipped on the valve element and seal material fixed on the valve seat, a recess part is formed on an opposite position of the keyhole in the frame element, then a tip end of the seal material is projected above the fringe of the lid element, and thereby rainwater goes into the recess part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof device for a cover of an underground structure, and is used for a manhole, a CC box and the like.

[0002]

2. Description of the Related Art First, a manhole will be described as a conventional example of an underground structure and will be described with reference to FIG.

[0003] In the figure, M is an iron cover, and 10 is its frame. Reference numeral 20 denotes a lid, which is swingably installed on the inner peripheral surface of the frame 10 by a hinge (not shown). Reference numeral 21 denotes a keyhole, which is provided at an end of the lid 20 opposite to the hinge. The keyhole 21 has a U-shaped notch shape. Reference numeral 30 denotes a valve body, which is pivotally supported on the back surface of the lid body 20 by a shaft 31. The valve body 30 is provided with the shaft 31
Is formed in a substantially L-shape with the portion at the center, and a valve cover is provided at the upper end.
Has 50. This valve lid 50 is a keyhole in the lid 20.
21 is covered from the back. The valve lid 50 has a packing 52 mounted on a valve seat 51 integrally formed with the valve body 30, and is screwed to the valve seat 51 while being sandwiched by a holding plate 53. Maintains watertightness when covered.
In addition, H has shown the manhole which is an intermediate structure.

[0004] Reference numeral 32 denotes a locking member, which is formed on the lower end side of the valve body 30. The locking member 32 is locked to the locking projection 11 of the lid 10 so that the lid 20 is
Can be locked against 10. The valve cover 50
When the key covers the keyhole 21, the locking member 32 is in a locked state.

[0005] Next, reference numeral 60 denotes a weight, which is formed integrally with the valve body 30. The weight 60 tries to rotate the valve body 30 in the closing direction of the keyhole 21 (clockwise in the figure). 70 is a spring, and the cover 20
The valve body 30 is always urged in the direction in which the valve cover 30 is closed (clockwise in the figure).

[0006]

However, in such a conventional waterproofing device for a cover of an underground structure, the tip end surface of the packing 52 is flat and the frame 10
Since the inner peripheral surface of the key hole 21 is formed in a tapered shape whose diameter increases upward, a slight gap is generated between the inner peripheral surface of the frame body 10 and the distal end surface of the packing 52 in the keyhole 21. However, as a result, there is an inconvenience that rainwater and the like slightly enter.

An object of the present invention is to solve the above-mentioned disadvantages.

[0008]

In order to achieve this object, a waterproof device for a lid of an underground structure according to the present invention is provided with a frame of the underground structure and an openable and closable attachment to the frame. Provided with a keyhole on the periphery of the lid and pivotally supporting the valve on the back surface of the lid so as to be swingable, and providing a valve lid at one end of the valve and at the other end. A weight is provided, and the valve body is allowed to move in and out of the key hole by swinging the valve body, and the valve cover is mounted and fixed to the valve seat provided on the valve body and the valve seat. In a waterproof device for a lid of an underground structure composed of a sealing material, a concave portion is formed at a position of the frame body opposite to the key hole, and a leading edge of the sealing material protrudes from a peripheral edge of the lid body. The seal material and the inner periphery of the frame body It is those which do not gap generated between the.

If the tip of the sealing material is tapered, it is easy to bend. Therefore, when the lid is fitted inside the frame, the projecting tip of the sealing material is attached to the frame 10. In the recess.

[0010] Further, if the back surface of the leading edge of the sealing material is inclined, it is easy to bend toward the front surface side. Therefore, when the lid is fitted inside the frame, the projecting tip of the sealing material is used. In accommodating the edge in the concave portion of the frame, the operation can be further simplified.

[0011]

FIG. 1 is a sectional view of a waterproofing device for a lid of an underground structure according to the present invention in a locked state, and FIG. 2 is a partial view taken along the arrow II in FIG.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. However, the description of the same components as those of the prior art will be omitted.

D is a waterproof device for a lid of an underground structure according to the present invention. 12 is a concave portion (including a hole),
It is formed on the inner peripheral surface of the frame 10. The upper inner wall surface of the concave portion 12 is substantially horizontal, but the lower wall surface extends in an inclined manner and is connected to the back surface of the locking projection 11.

The leading edge of the packing (corresponding to the “seal material” of the present invention) 52 protrudes beyond the peripheral edge of the lid 20. When the valve cover 50 is in the closed state, the valve cover 50 enters the recess 12. At this time, the upper surface of the packing 52 is
Due to the action of, the recess 12 is pressed against the upper wall surface.
For this reason, in the keyhole 21, there is no gap between the packing 52 and the frame 10, and watertightness is maintained.

The leading edge of the packing 52 is tapered, so that it is easy to bend. Therefore, when the lid 20 is fitted inside the frame 10, the protruding leading edge of the packing 52 is attached to the frame. It is easy to be accommodated in the ten recesses 12.
Further, when forming the taper shape, since the back surface of the leading edge of the packing 52 is inclined obliquely, the leading edge easily bends to the front side (upper side).
The work of fitting into 10 becomes even easier.

In this embodiment, the frame 10 and the lid 20 are manufactured by casting.

[0017]

According to the present invention, there is provided a waterproofing device for a cover of an underground structure, comprising a frame of the underground structure and a cover openably and closably attached to the frame. And a valve body is pivotally supported on the back surface of the lid body so as to be swingable, a valve lid is provided at one end of the valve body and a weight is provided at the other end, and the valve body swings. A cover for an underground structure, wherein the valve cover can be inserted into and removed from the keyhole, and the valve cover includes a valve seat provided on the valve body and a sealing material mounted and fixed on the valve seat. In the waterproofing device, a concave portion is formed at a position of the frame opposite to the keyhole, and a tip edge of the sealing material projects from a peripheral edge of the lid so as to enter the concave portion. No gap is generated between the frame and the inner peripheral surface of the frame.

Therefore, if the waterproofing device for a lid of an underground structure is used, it is possible to prevent rainwater or the like from entering from the keyhole of the lid unlike the related art.

If the tip of the sealing material is tapered, it is easy to bend. Therefore, when the lid is fitted inside the frame, the projecting tip of the sealing material is attached to the frame 10. In the recess.

Further, if the back surface of the leading edge of the sealing material is inclined, it is easy to bend toward the front surface side. Therefore, when the lid is fitted inside the frame, the projecting tip of the sealing material is used. In accommodating the edge in the concave portion of the frame, the operation can be further simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a waterproofing device for a lid of an underground structure according to the present invention in a locked state.

FIG. 2 is a partial view taken along the arrow II in FIG.

FIG. 3 is a diagram of a conventional example corresponding to FIG. 1;

[Explanation of symbols]

 D… Lid waterproofing device H… Manhole (underground structure) M… Iron lid 10… Frame 12… Recess 20… Lid 21… Keyhole 30… Valve 50… Valve lid 51… Valve seat 52… Seal Lumber 60… weight

Claims (3)

[Claims] An underground structure has a frame and a lid attached to the frame so as to be openable and closable. A keyhole is provided on a periphery of the lid, and a valve is rocked on the back surface of the lid. The valve body is movably supported, a valve cover is provided at one end of the valve body, and a weight is provided at the other end, and the valve body swings so that the valve cover can enter and exit the keyhole, and In a waterproofing device for a lid of an underground structure comprising a lid provided with a valve seat provided on the valve body and a sealing material placed and fixed on the valve seat, a position where the keyhole faces the frame. A waterproofing device for an underground structure lid, wherein a concave portion is formed in the base member, and a leading edge of the sealing material projects from a peripheral edge of the lid member so as to enter the concave portion. 2. The waterproofing device for a cover of an underground structure according to claim 1, wherein a tip edge of the sealing material is tapered. 3. The waterproofing device for a lid of an underground structure according to claim 2, wherein a back surface of a front end edge of the sealing material is inclined.