JPS6223884Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention allows the cover of the manhole cover to be pushed up using water pressure when a large amount of rainwater flows into the sewer in a short period of time and exceeds the drainage capacity of the sewer. The present invention relates to a manhole cover with an internal pressure relief mechanism, in which the lid that has been pushed up is automatically placed on the receiving frame when the lid is returned.

With conventional manhole covers, when a large amount of rainwater flows into the sewer system in a short period of time, the water flow pushes up the cover of the manhole cover, especially those installed in low-lying areas, and the water flow from the manhole with the cover removed. In some cases, it erupted and overflowed onto the road. In this case, if the flow rate returns to within the drainage capacity of the sewer, the manhole cover will be placed on the road surface with the cover removed from the receiving frame, and the opening of the manhole will be exposed on the road surface, allowing passersby and This creates an extremely dangerous situation for moving vehicles, etc. As a result, manhole cover managers had the disadvantage of having to inspect all manhole covers located in low-lying areas after torrential rains, etc.

Therefore, in this invention, when the amount of water flowing exceeds the drainage capacity of the sewer system, the water pressure ejected from the manhole can push the cover part of the manhole cover up a certain distance.
To provide a manhole cover with an internal pressure relief mechanism that releases water flow to the road surface from the space between the receiving frame and the cover, and automatically places the cover on the receiving frame when the large jet of water from the manhole stops. . Another object of the present invention is to provide a manhole cover with an internal pressure relief mechanism that will not be destroyed even if an automobile or the like runs on the top surface while the cover is being pushed up by water flow.

An embodiment of this invention will be described based on the drawings. First of all, based on FIGS. 1 to 4, a manhole cover 1 installed on the road surface has a receiving frame 2.
The inclined outer circumferential surface 3a of the lid part 3 is fitted onto the inclined inner circumferential surface 2a of the frame 2, and a hinge shelf 4 is provided on the inner circumferential surface of the receiving frame 2 in order to connect the receiving frame 2 and the lid part 3 with a hinge. This hinge shelf 4 is provided with a long hinge hole 5 in the diametrical direction, and the hinge erected walls 7, 7 are arranged opposite to each other at the back end of the lid part 3. Arc-shaped recesses 7a, 7a are provided on opposing surfaces of the hinge erected walls 7, 7.
A circular spherical part 8 of a hinge connecting fitting 9 is rotatably disposed on a, and the lower part of the hinge connecting fitting 9 is loosely installed in the hinge long hole 5 of the hinge shelf 4. Projections 10, 10 are horizontally protruded from the lower end of the hinge connecting fitting 9 so as to engage with the lower surface of the elongated hole 5.

Next, engagement protrusions 30, 30 are horizontally protruded from the inner circumferential surface of the receiving frame 2 at positions approximately 120 degrees from the hinge shelf 4 as a reference. The lid part 3 has engaging protrusions 30, 3.
Locking metal fittings 20, 20 are arranged at the 0 position, and in order to slidably fit the locking metal fittings 20, 20, a circular part 11 is bored in the lid part 3, and elongated holes are formed on the left and right sides of the circular part 11. 12 and 13 are continuously drilled, and a sliding hole 15 in which a shelf 14 is provided is provided at the edge of the circular portion 11 and the elongated holes 12 and 13 on the upper surface of the lid portion 3. . Locking metal fitting 2 inserted into this sliding hole 15
0 and 20 are a cylindrical part 22 that fits into the circular part 11 of the sliding hole 15, and sliding holes 1 on the left and right sides of this cylindrical part 22.
Sliding parts 23, 2 that fit into the long holes 12, 13 of 5
4 are disposed, and the sliding parts 23 and 24 are provided with notches 25 and 26 at the same position in the horizontal direction, and a lid part is provided at the upper ends of the sliding parts 23 and 24 and the columnar part 22. An engaging lid part 21 that fits into the shelf part 14 of No.
A locking protrusion 29 is disposed on the left side of the lower end of 2, and when the locking fittings 20, 20 move upward, the locking protrusion 29 comes into contact with the engaging protrusions 30, 30 disposed on the receiving frame 2, and is engaged. be stopped.

Next, we will discuss the case where the manhole shown in FIG. 5 is filled with running water and internal pressure is applied to the manhole cover 1. When the cover 3 is pushed up by water pressure,
The protrusions 10, 10 of the hinge connecting fitting 9 engage with the lower surface of the hinge shelf 4 of the receiving frame 2, and the right side of the lid 3 can no longer be pushed up. On the other hand, on the left side of the lid 3, when the lid 3 is pushed up, the locking fitting 20,
The locking protrusions 29, 29 of 20 are the engagement protrusions 3 of the receiving frame 2.
0 and 30, and it becomes impossible to push up the lid part 3 any further. When the lid part 3 is pushed up, the lid part 3 is spaced apart from the receiving frame 2 in a position substantially parallel to the receiving frame 2, and drains water flow from the space between the receiving frame 2 and the lid part 3 to the road surface. . When the water flow from the inside of the manhole stops flowing, the cover 3 lowers under its own weight, moves downward, and moves to the inclined inner circumferential surface of the receiving frame 2.
The inclined outer circumferential surface 3a of the lid part 3 is fitted into the part a, and the lid part 3 is automatically arranged on the receiving frame 2.

Next, we will discuss the case where the cover part 3 of the manhole cover 1 shown in FIGS. 6 to 8 is opened artificially. The arcuate portion 3 of the lock 31 is attached to the portions 33 and 34.
2, and insert it into the tip of the lock 31.
When pushed in while rotating, the arcuate portion 32 is inserted into the lock holes 27 and 28 provided above the sliding portions 23 and 24 of the locking fitting 20, and the arcuate portion 32 of the locking fitting 31 is inserted into the lock holes 27 and 28, the engagement lid part 21 of the locking metal fitting 20 is disengaged from the shelf part 14 of the lid part 3, and the locking metal fitting 20 moves through the sliding hole 15 of the lid part 3 in the vertical direction. In this state, the notches 25 and 26 of the locking metal fittings 20 and 20 are aligned in the same position as the plate-shaped portion 3b of the lid part 3, and then the locking metal fittings 2
0, 20, the notches 25, 26 of the locking fittings 20, 20 engage with the plate-like portion 3b of the lid 3, and the locking protrusions 29 of the locking fittings 20, 20 and the receiving frame 2
The engagement relationship of the engagement protrusions 30 is disengaged, and the lid portion 3 can be opened as a handle with the locks 31, 31 disposed on the locking fittings 20, 20.

When the lid part 3 is inserted into the receiving frame 2 and closed, after the lid part 3 is inserted into the receiving frame 2, the locking fitting 20,
20 to release the engagement between the notches 25 and 26 and the plate-shaped part 3b of the lid part 3, and then remove the locking fittings 20 and 20.
Fit the sliding parts 23 and 24 into the sliding holes 15 of the lid part 3, move the locking fittings 20 and 20 downward, and insert and fit the engaging lid part 21 into the shelf part 14 of the lid part 3. It is done by

As described above, the present invention includes a hinge upright portion 7 having arcuate recesses 7a, 7a formed on the lower surface of one end of the lid portion 3;
By providing 7, when the spherical part 8 of the hinge connecting fitting 9 is fitted into the arcuate recesses 7a, 7a and the lid is opened, the lid part 3 can be rotated around the spherical part 8. Therefore, the lid part 3 can be turned over and fixed at any position on the outside of the upper part of the receiving frame 1, which is very convenient for opening and closing the lid in a narrow place. Even if the lid portion 3 attempts to rise to the surface, the protrusions 10, 10 of the hinge connector 9
is engaged with the hinge shelf 4, and the engagement protrusion 29 of the cylindrical portion 22 of the engagement fitting 20 is engaged with the engagement protrusion 30, providing three-point support to hold the lid 3 in a horizontal state. Water can be spouted from the center of the receiving frame 2 to rapidly reduce the pressure inside the water pipe. Furthermore, when opening and closing the lid, the arcuate portion 32 of the lock 31 is inserted into the lock holes 27 and 28, the cylindrical portion 22 is rotated, and the locking protrusion 29 is engaged with and removed from the engaging protrusion 30. The locking protrusion 29 can be opened and closed, and the locking protrusion 29
In order to open the lid by raising the cylindrical part 22 until it reaches 0, the single cylindrical part 22 functions to raise the lid part 3 to buffer the internal pressure of the water pipe and also to raise the lid to open the lid. This has the advantage of reducing the number of parts, making the structure more robust, and making it easier to operate.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a manhole cover, Fig. 2 is a cross-sectional view showing the engagement between the cover and the locking metal fitting, Fig. 3 is a plan view of the sliding hole portion of the cover, Fig. 4 is a plan view of the locking metal fitting, Fig. 5 is a cross-sectional view of the cover when it is raised by water pressure, Fig. 6 is a cross-sectional view showing the position of the locking metal fitting that disengages the cover from the receiving frame, Fig. 7 and Fig. 8 are cross-sectional views for lifting the locking metal fitting from the cover. 1... Manhole cover, 2... Receiving frame, 3... Cover, 4... Hinge shelf, 5... Hinge long hole, 7...
... Hinge standing wall, 8... spherical portion, 9... hinge connecting metal fitting, 15... sliding hole, 20... locking metal fitting, 2
1: Engagement lid portion, 22: Cylindrical portion, 23, 24:
...sliding portion, 25, 26...notch portion, 27, 28...
...lock hole, 29...locking projection, 30...engagement projection,
31...lock, 32...arcuate portion of the lock.

Claims (1)

[Scope of utility model registration request] In a manhole cover in which the inclined outer circumferential surface 3a of the cover part 3 is fitted to the inclined inner circumferential surface 2a of the receiving frame 2, the standing walls 7, 7 for hinges are provided with circular arc-shaped recesses 7a, 7a at one end of the back surface of the cover part 3. is provided protrudingly, and a protrusion 10 is provided at the lower end.
A spherical part 8 rotatably fitted into the arc-shaped recesses 7a, 7a is provided at the upper end of the hinge connecting fitting 9 provided with the hinge fitting 9, and the hinge connecting fitting 9 is inserted inside one end of the receiving frame 2. A hinge shelf 4 with a long hinge hole 5 is protruded, and the other end of the lid 3 has a sliding hole with a circular portion 11 in the center and long holes 12 and 13 at both ends. 15 is bored, cutouts 33, 33 and 34, 34 are formed on both sides of the sliding hole 15, and a shelf 14 is provided on the outer periphery, and a hinge shelf 4 is provided at the other end of the receiving frame 2. Engagement protrusions 30, 30 are horizontally protruded at positions approximately 120 degrees from The lock holes 27, 2 are located at positions corresponding to the notches 33, 33 and 34, 34.
8 and having notches 25 and 26, sliding parts 23 and 24 that fit into the long hole parts 12 and 13 of the sliding hole 15, and a cylindrical part 22 that fits into the circular part 11.
is provided protrudingly at the lower end of the cylindrical portion 22.
A manhole cover with an internal pressure relief mechanism, characterized in that a locking protrusion 29 that locks at zero is protruded.