JP4310764B2 - Water leak prevention device for manhole cover fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing device for a manhole cover for fixing a sealed manhole cover to a cover receiving frame, and the leakage of the fixing device that can prevent water leakage from the fixing device when the manhole cover is opened. The present invention relates to a prevention device.
[0002]
[Prior art]
There are known sealed manhole covers that shield waterholes, oil tanks, and other manhole openings that require waterproofing, such as joint grooves and electrical wiring box inspection ports.
[0003]
5 and 6 show a conventional fixing device for fixing the sealed manhole cover a to the cover receiving frame b. This is because the support arm d is detachably mounted in the lid receiving frame b disposed in the opening of the manhole c, and the receiving edge e formed on the upper portion of the lid receiving frame b is placed on the lower surface of the outer peripheral portion. A manhole cover a provided with a water stop packing f is mounted, and a screw rod g standing on the support arm d is inserted from below into an insertion hole i of an operating recess h formed in the manhole cover a. At the same time, by tightening a tightening nut j on the protruding end side of the screw rod g in the operation recessed portion h, the tightening action of the tightening nut j causes the manhole cover a to pass through the water-stopping packing f. It is fixed by being pressure-bonded to the receiving edge e of b in a sealing manner. Further, in the operation recess h, the rotation stopper cap k is fitted over the tightening nut j, and the padlock m is locked to the screw rod g protruding above the tightening nut j, thereby loosening the tightening nut j. The rotation operation is disabled, and thereby, it is possible to prevent the manhole cover a from being unnecessarily opened due to mischief or the like.
[0004]
[Problems to be solved by the invention]
By the way, the upper opening of the operation recess h is shielded by a small lid n screwed onto the upper end of the screw rod g. Is disposed on the lid receiving edge r of the operation recessed portion h through the screwing operation of the small lid n with respect to the screw rod g. The water is prevented from entering. Further, a seal washer t sandwiched between the tightening nut j and the bottom wall upper surface of the operation recessed portion h is interposed, and the insertion hole i and the screw rod g are interposed by the seal washer t. The gap s generated between the two is closed from above.
[0005]
Thus, in the waterproof means using the water-stopping packing p of the small lid n and the seal washer t as described above, the water-stopping packing p should be deteriorated, and the water in the operation recess h Is inserted into the manhole c through the gap s, although water is collected in the operation concave portion h because the gap s between the insertion hole i and the screw rod g is blocked by the seal washer t. There is nothing. However, in this state, if the tightening nut j is loosened in order to open the manhole cover a, the water stop action by the seal washer t disappears, so that the water in the operation recess h immediately passes through the insertion hole i. There was a problem that it leaked into the manhole c.
[0006]
It is an object of the present invention to provide a water leakage prevention device for a manhole cover fixing device that can solve the conventional problems.
[0007]
[Means for Solving the Problems]
In the present invention, a support arm is detachably mounted in a lid receiving frame to which a manhole cover is attached, and a screw rod standing on the support arm is provided below an insertion hole of an operation recess formed in the manhole cover. And a fastening nut is screwed onto the protruding end side of the screw rod in the operation recess, and the manhole cover is fixed by being crimped to the lid receiving frame through the fastening action, and the insertion hole and the screw are further fixed. A manhole cover fixing device comprising a waterstop packing for closing a gap generated between the flanges, wherein a water receiving recess is formed in the support arm so as to surround the screw rod. This is a water leakage prevention device.
[0008]
In such a configuration, when water enters the operation concave portion, the water is accumulated in the operation concave portion due to the water stop action of the water stop packing that closes the gap between the insertion hole and the screw rod. In this state, if the tightening nut is loosened so as to open the manhole cover, the water-stopping action of the water-stopping packing disappears, and the water in the operation recessed portion flows downward through the insertion hole. However, this water can be received by the water receiving recess of the support arm. Thereby, water leakage into the manhole can be prevented.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 2, the lid receiving frame 2 disposed in the opening of the manhole 1 is formed in an annular shape, and the upper portion of the peripheral wall 3b rising from the horizontal mounting substrate portion 3a is located at the upper position of FIG. As shown in FIG. 2, a receiving edge 4 projecting inward is provided. In addition, locking edges 5 and 5 each having a pair of upper and lower locking pieces 6a and 6b project inwardly at a lower position of the peripheral wall 3b so as to face each other at positions different by 180 °. .
[0010]
A manhole cover 7 formed in a circular shape with an outer diameter substantially equal to the inner diameter of the peripheral wall 3 b is attached to the cover receiving frame 2. The manhole cover 7 is fitted with a water-stopping packing 8 on the lower surface of the outer peripheral portion, and the manhole cover 7 is mounted on the receiving edge 4 of the peripheral wall 3b by mounting the water-stopping packing 8 portion on the cover receiving frame. 2 is attached. As shown in FIG. 1, a circular operation recess 9 is integrally formed at the center of the manhole cover 7. As shown in FIG. 3, an insertion hole 11 of a screw rod 17 described later is formed in the center of the bottom wall of the operation recess 9, and on the bottom wall of the operation recess 9, An annular wall 12 that can accommodate the tightening nut 25 is formed so as to surround the insertion hole 11. Further, the upper opening of the operation recess 9 is shielded by a small lid 13 that is screwed onto the upper end of the screw rod 17. The small lid 13 has a water-stopping packing 14 made of an O-ring fitted on the lower surface of the outer peripheral portion thereof applied to the lid receiving edge 15 of the operation recessed portion 9 through the screwing operation of the small lid 13 to the screw rod 17. By pressure bonding, water can be prevented from entering into the operation recess 9.
[0011]
Further, as shown in FIGS. 1 and 2, a support arm 16 is detachably mounted in the lid receiving frame 2 by engaging both ends with the locking edges 5 and 5 as shown in FIGS. As shown in FIGS. 3 and 4, a screw rod 17 is provided on the support arm 16 at a position that coincides with the insertion hole 11 of the operation concave portion 9 in the vertical direction. The water receiving recess 18 is formed so as to surround Here, the screw rod 17 has a lower end portion screwed into a screw hole 19 formed in the bottom wall of the water receiving recess 18, and a locking nut 20 is screwed into a tightening shape from above to support arm. 16 is attached so as not to rotate. Further, a means for preventing water leakage of the screw hole 19 is applied to a screwed portion between the screw rod 17 and the screw hole 19 by previously applying a sealant or winding a seal tape. The screw rod 17 is formed with a lateral hole 23 through which the U-shaped rod 22 of the padlock 21 can be inserted in the vicinity of the upper end, and a stopper made of a seal washer at the upper position of the locking nut 20. A water packing 24 is fitted.
[0012]
Next, a procedure for fixing the manhole cover 7 to the cover receiving frame 2 will be described.
First, both end portions of the support arm 16 are respectively inserted from the side portions between the locking piece portions 6a and 6b of the locking edges 5 and 5 projecting inwardly in the cover receiving frame 2 so as to face the lower side. The supporting arm 16 is horizontally mounted in the lid receiving frame 2 by supporting both end portions of the locking piece portions 6b and 6b. Next, the manhole cover 7 is attached to the cover receiving frame 2 so that the outer peripheral portion of the manhole cover 7 is placed on the receiving edge 4 of the cover receiving frame 2, and the screw rod provided upright on the support arm 16 is installed. 17 is inserted through the insertion hole 11 of the operation recess 9 of the manhole cover 7 from below. At this time, a water-stopping packing 24 made of a seal washer is fitted in advance to the screw rod 17, and the water-stopping packing 24 is interposed between the upper surface of the locking nut 20 and the lower surface of the operation recess 9. I will let you.
[0013]
In this state, the tightening nut 25 is screwed from above onto the projecting end side of the screw rod 17 projecting into the operation recessed portion 9, and the tightening nut 25 is rotated in the tightening direction by a wrench-shaped dedicated tool. As a result, the support arm 16 ascends with its rotation, and both end portions thereof are brought into pressure contact with the locking pieces 6a and 6a on the upper side of the locking edges 5 and 5, and the tightening nut 25 is tightened. The manhole cover 7 is pressed and fixed to the receiving edge 4 through the water-stopping packing 8 by the tightening action. Thereby, the opening part of the manhole 1 is sealed, and inflow of rainwater or the like into the manhole 1 or leakage of odor in the manhole 1 is prevented. Further, by tightening the tightening nut 25 as described above, the water-stopping packing 24 is clamped by the upper surface of the loosening-preventing nut 20 and the lower surface of the operation recessed portion 9. The effect | action which plugs up the clearance gap s produced between the insertion hole 11 of the operation recessed part 9 and the screw rod 17 from the downward direction is acquired.
[0014]
Thereafter, the barb 22 is inserted into the lateral hole 23 of the screw rod 17 to lock the padlock 21, and finally, the small lid 13 is screwed to the upper end of the screw rod 17, and the operation recess 9 The upper opening of is sealed in a sealed manner.
[0015]
When the manhole cover 7 is in a fixed state, and the water-stopping packing 14 of the small lid 13 that shields the operation recess 9 in a hermetically sealed state deteriorates, and water enters the operation recess 9, Since the gap s between the insertion hole 11 and the screw rod 17 is closed by the water stop packing 24, the invaded water is accumulated in the operation recessed portion 9.
[0016]
When the manhole cover 7 is opened, the manhole cover 7 can be lifted by removing the small cover 13 and the padlock 21 in order and then loosening and removing the tightening nut 25. And, as described above, when the tightening nut 25 is loosened in an attempt to open the manhole cover 7 in a state where water is accumulated in the operation recessed portion 9, the water stopping action of the water stopping packing 24 disappears. The water in the operation recess 9 flows downward through the insertion hole 11, and this water is received by the water receiving recess 18 of the support arm 16 disposed at the lower position of the insertion hole 11. I can take it. Thereby, the leakage of water into the manhole 1 can be prevented.
[0017]
The water that has flowed into the water receiving recess 18 can be removed by removing the support arm 16 from the lid receiving frame 2. Further, when the manhole cover 7 is opened, the amount of water flowing into the water receiving recess 18 can be reduced by scraping out the water accumulated in the operation recess 9 to some extent in advance. Further, in the accompanying drawings, the water receiving recess 18 having a small volume compared to the volume of the operation recess 9 is shown, but the water receiving recess 18 is formed to have a larger volume than the operation recess 9. Thus, it is possible to receive all the water accumulated in the operation recess 9 in the water receiving recess 18.
[0018]
【The invention's effect】
As described above, according to the present invention, the support arm 16 is detachably mounted in the lid receiving frame 2 to which the manhole cover 7 is attached, and the screw rod 17 erected on the support arm 16 is attached to the manhole cover 7. The insertion hole 11 of the operation concave portion 9 thus formed is inserted from below, and a tightening nut 25 is screwed onto the protruding end side of the screw rod 17 in the operation concave portion 9, and the manhole is connected via the tightening action. A fixing device for a manhole cover 7 comprising a waterproof seal 24 for fixing the cover 7 to the cover receiving frame 2 by crimping and closing the gap s formed between the insertion hole 11 and the screw rod 17. 16, the water receiving recess 18 is formed so as to surround the screw rod 17. Therefore, when the manhole cover 7 is opened, the water in the operation recessed portion 9 that flows downward through the insertion hole 11 is removed. 18 Accordingly, an excellent effect capable of reliably preventing water leakage into the manhole 1.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a construction state showing an embodiment of a water leakage prevention device in a manhole cover fixing device according to the present invention.
FIGS. 2A and 2B show a manhole cover attached to the cover receiving frame of the embodiment, wherein the right half is a bottom view and the left half is a plan view.
FIG. 3 is an enlarged vertical sectional view of a main part.
FIG. 4 is a perspective view of a support arm in which a water receiving recess is formed.
FIG. 5 is a longitudinal sectional view of a construction state showing a conventional configuration.
FIG. 6 is an enlarged longitudinal sectional view of a main part of a conventional configuration.
[Explanation of symbols]
2 Lid receiving frame 7 Manhole lid 9 Operation recess 11 Insert hole 16 Support arm 17 Screw rod 18 Water receiving recess 24 Water seal 25 Tightening nut s Gap

Claims (1)

A support arm is detachably mounted in a lid receiving frame to which a manhole cover is attached, and a screw rod standing on the support arm is inserted from below into an insertion hole of an operation recess formed in the manhole cover. A tightening nut is screwed onto the protruding end side of the screw rod within the operation recess, and the manhole cover is fixed to the lid receiving frame through the tightening action, and is further formed between the insertion hole and the screw rod. In the fixing device of the manhole cover provided with the water stop packing that closes the gap,
A water leak prevention device for a manhole cover fixing device, wherein a water receiving recess is formed in the support arm so as to surround a screw rod.

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