JP2002332653A - Device for prevention of inflow of rainwater and locking of manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure locking of a floating-of-cover preventing fitting and suppress inflow of rainwater, soil, etc., through a tool inserting groove, without reference to an installation position of the manhole cover. SOLUTION: The manhole cover M is equipped with a cover body 20, which is mounted in an opening 11 of a receiving frame 10, and the floating-of-cover preventing fitting 40 wherein a hinge for openably/closably coupling the cover body 20 to the receiving frame 10 is formed on a side of one end of the cover body 20, wherein the tool inserting groove 21 provided in the cover body 20 is closed on a side of the other end of the cover body 20, and which can be engaged with the receiving frame 10. The fitting 40 is provided with a weight 41 which is turned, by gravity, on a connecting shaft 50 laid across the cover body 20. One side part of the weight 41 is provided with an operating protrusion 45, with which the groove 21 is closed, and a locking protrusion 46 which is engaged with a locking receiving part 12, provided protrusively in the receiving frame 10, in such a manner as to be capable of engagement/disengagement. A spring member 60 is provided in such a manner as to urge an elastic force in a direction, in which the groove 21 is closed with the operating protrusion 45, and in a direction in which the locking protrusion 46 is engaged with the receiving part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater inflow prevention and locking device for a manhole cover, and more particularly to an opening for communicating an underground buried object or underground structure facility in a sewer with the ground. And a lock device for preventing rainwater from flowing into a manhole cover.

[0002]

2. Description of the Related Art Conventionally, when a manhole cover is artificially opened and closed, a tool such as a crowbar or a hook is inserted into a tool insertion groove provided in the cover to open or close the manhole cover. It is common practice to do so.

[0003] However, the manhole cover of the sewer, in particular,
Due to population increase and centralization, the spread of sewerage is promoted, and the expansion of manholes limits the capacity of wastewater treatment plants.
At present, the amount of water flowing from the tool insertion groove due to rainfall or the like is enormous, which is more than the processing power of the wastewater final treatment plant. In addition, the sediment flowing from the tool insertion groove of the lid accumulates in the sewer and obstructs the flow rate of the sewage, and enormous cost is required for the operation of removing the sediment in the sewer.

[0004] Therefore, the applicant has prevented rainwater, earth and sand from flowing into the tool insertion groove for opening and closing the lid, and also automatically closes the tool insertion groove except when the lid is opened and closed. A rainwater inflow prevention and locking device for locking the body and the receiving frame has already been developed (see Japanese Utility Model Publication No. 6-29237).

According to the above rainwater inflow prevention and locking device, the locking projection is engaged with the inner locking portion of the receiving frame by the weight of the weight of the lid floating prevention metal fitting, and the tool of the lid is held by the operating projection. Since the insertion groove can be closed, the working projection prevents rainwater and the like from flowing into the underground structure, and when an air hammer or water hammer phenomenon occurs in the underground structure, the locking projection is used as a receiving frame. Floating and scattering of the lid can be prevented.

In the conventional rainwater inflow prevention and locking device, when the lid is unlocked, the locking projection of the lid floating prevention fitting is locked by the first cam provided on the lid. When moving in a direction away from the receiving portion and locking the lid, the locking cam is moved toward the locking receiving portion by the second cam provided on the lid.

[0007]

However, the rainwater inflow prevention and locking device described in Japanese Utility Model Publication No. 6-29237 has a structure in which the locking state is maintained by the weight of the lid floating prevention fitting, so that, for example, a tool insertion is required. When external pressure such as rainwater or earth and sand is applied to the working projection that closes the groove, the lid floating prevention bracket is easily unlocked, and when the manhole lid is installed on an inclined road surface, Depending on the inclination angle, the lid floating prevention metal fittings are easily unlocked. If an air hammer or a water hammer phenomenon occurs in the underground structure in this state, the lid may float and scatter.

Further, in the conventional rainwater inflow prevention and locking device, since the locked state is maintained only by the own weight of the lid floating prevention fitting, there is a problem that the weight and material of the lid floating prevention fitting are increased. In addition, since the first and second cams are required to securely engage and disengage the locking projections of the lid floating prevention fitting with the locking receiving portions of the receiving frame, the structure of the lid becomes complicated. However, there is also a problem that processing is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables the locking of a lid floating prevention metal fitting reliably regardless of the installation position of a manhole cover, and prevents rainwater, earth and sand, etc. from a tool insertion groove. It is an object of the present invention to provide a rainwater inflow prevention and lock device that suppresses inflow.

[0010]

According to one aspect of the present invention, there is provided a receiving frame having an opening, a lid attached to the opening of the receiving frame, and one end of the lid. To
A hinge for connecting the lid to the receiving frame so as to be openable and closable is formed, and at the other end of the lid, a tool insertion groove provided in the lid is closed and engageable with the receiving frame. In a manhole cover provided with a lid floating prevention metal fitting, the lid floating preventing metal fitting has a weight that rotates by gravity about a connection shaft that is laid on the lid body, and one side of the weight. An operating projection that closes the tool insertion groove, and a locking projection that removably engages with a locking receiving portion that is provided inside the receiving frame, and the operating projection is a tool. A spring member is provided that urges an elastic force in a direction to close the insertion groove and a direction in which the locking projection engages with the locking receiving portion.

[0011] With this configuration, the spring for urging the lid floating prevention fitting to resilient force in the direction in which the operation convex portion closes the tool insertion groove and the direction in which the locking convex portion engages with the locking receiving portion. When the manhole cover is installed on an inclined road surface or when pressure such as rainwater and earth and sand from the outside is applied to the operation convex part of the cover body, the elastic force of the spring member always covers the cover. The body can be forcibly locked in the opening of the receiving frame. And even if an air hammer or a water hammer phenomenon occurs in the underground structure, it is possible to eliminate the danger that the lid will come off the receiving frame.

In the present invention, the spring member may be a spring member that urges an elastic force in a direction in which the operating projection closes the tool insertion groove and in a direction in which the locking projection engages with the locking receiving portion. For example, the mounting position and the structure may be arbitrary, but preferably, the weight of the lid floating prevention metal fitting has a concave base opening to one side, and a cutout at the upper side and the other side of the concave base. A coil portion wound around the connecting shaft in the cutout portion of the weight, and a spring extending from one end of the coil portion and pressed against the back surface of the lid. It is preferable to provide one locking portion and a second locking portion extending from the other end of the coil portion and engaging with an engaging hole formed in the side wall of the concave base portion. ). In this case, as long as the coil portion is wound around the connection shaft in the notch portion, the arrangement form may be arbitrary, but preferably the bearing portion is slidably fitted to the connection shaft and the bearing portion is It is better to shrink the coil portion between the cover and the cover (claim 3).

[0013] With this configuration, the coil portion is wound around the connecting shaft in the cutout portion of the weight,
The space for disposing the spring member can be reduced, and the lid floating prevention fitting can be made compact. In addition, the operating protrusion can reliably close the tool insertion groove by the elastic force in the winding direction of the spring member, and the locking protrusion can be reliably engaged with the locking receiving portion. In this case, the bearing portion is slidably fitted to the connection shaft, and the coil portion of the spring member is contracted between the bearing portion and the lid, so that the bearing member extends in the bearing direction orthogonal to the winding direction of the spring member. The engagement between the locking projection and the locking receiving portion can be further ensured by the elastic force.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rainwater inflow prevention and locking device for a manhole cover according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view showing a locked state of a manhole cover provided with a rainwater inflow prevention and locking device for a manhole cover of the present invention, FIG. 2 is an enlarged sectional view showing a main part of the present invention, and FIG. FIG. 3 is a sectional view taken along line AA of FIG. 2.

As shown in FIG. 1, the manhole cover M has, for example, a receiving frame 10 having a substantially circular opening 11 communicating with an underground structure, and a lid 20 attached to the opening 11 of the receiving frame 10. It is mainly composed of In this case, the opening 11 of the receiving frame 10 has a taper that increases in diameter toward the upper end, and the lid 20 has a tapered surface that decreases in diameter toward the rear surface side. The inner peripheral surface is configured to be fitted by a tapered surface to prevent rattling.

A hinge 30 for opening and closing the cover 20 to the receiving frame 10 is provided on one end side 22 of the cover 20.
Is formed on the other end 23 of the lid 20.
A tool insertion groove 21 is formed so as to penetrate along the outer peripheral edge of the groove and has a substantially U-shape in plan view (see FIGS. 7 and 8). On the other end side of the lid 20, a lid floating prevention metal fitting 40 that can close the tool insertion groove 21 and engage with the receiving frame 10 is formed.

As shown in FIG. 2 to FIG. 8, the lid floating prevention bracket 40 includes a weight 41 that rotates by gravity about a connecting shaft 50 that is laid on the back surface of the lid 20 and a weight 41 that rotates by gravity. An operation protrusion 45 protruding from one side of the weight 41 to close the tool insertion groove 21 and a locking protrusion detachably engaged with the locking receiving portion 12 protruded inside the receiving frame 10. The direction in which the part 46 and the operation convex part 45 close the tool insertion groove 21 and the locking convex part 4
6 includes a spring member 60 that urges an elastic force in a direction in which the engagement member 6 engages with the lock receiving portion 12.

In this case, the weight 41 is rotatably mounted on a connecting shaft 50 which is suspended between brackets 25a and 25b projecting from the back surface of the lid 20. In addition, the weight 41 includes a concave base 42 that opens to one side, and a bearing 43 formed by cutting off the other end of the upper part of the concave base 42. It is formed so as to be rotatable by the gravity so as to be rotatable by gravity. The bearing 43 is slidably fitted to the connection shaft 50.

The operating projection 45 is formed at the tip of an arm 44 projecting in a substantially L-shape in a direction away from the weight 41 on the outer peripheral surface on the end side of the bearing portion 43 of the weight 41 formed as described above. Have been. By providing the operation convex portion 45 in the direction away from the weight 41 via the arm 44 in this manner, the lid floating prevention bracket 40 is rotated with a small force when the lid 20 is opened by utilizing the principle of leverage. be able to.

One of the brackets 25a and 25b is formed by making the rear edge of the lid 20 thick, and the other bracket 25b is formed by the lid 2
0 is formed by a part of the reinforcing rib 25 protruding from the back surface. Brackets 25a, 25 formed in this way
7 and 8, one end of the connecting shaft 50 is inserted into the shaft mounting recess 24 provided in the bracket 25a, and a shaft mounting hole formed in the bracket 25b. 26, the other end is fitted. In this mounting state, the connecting shaft 50 is
6, there is a possibility that the connecting shaft 50 will come off. in this case,
The fixing bolt 70 is attached through a bolt mounting hole 27 formed in a mounting piece 25 c protruding from a part of the reinforcing rib 25.
The first and second nuts 71 and 7 screwed to the fixing bolt 70 via the mounting piece 25c in a state where the other end faces of the
2 is fixed by tightening.

On the outer surface of the side wall 47a on the receiving frame side of the weight 41, a locking projection 46 is provided to protrude laterally. The tip end and the lower surface of the locking projection 46 are formed in an arc shape, and the upper end surface is formed in a flat shape. The other side wall 47b of the weight 41 has a spring engagement hole 49 with which the spring member 60 can be engaged.

As shown in FIGS. 2 to 6, the spring member 60 has a notch 4 formed on the upper part of the weight 41.
8, a coil portion 61 wound around the connecting shaft 50, a first locking portion 62 extending straight from one end of the coil portion 61 and pressed against the back surface of the lid 20, The bent portion 63a at the end extends substantially in an L shape from the other end, and is formed by the second locking portion 63 that engages with the engaging hole 49 provided in the side wall 47b of the weight 41. . In this case, the coil portion 61 is contracted between the bearing portion 43 of the weight 41 and the bracket 25b of the lid 20.

As described above, the coil portion 61 of the spring member 60
Is wound around the connecting shaft 50 in the notch portion 48 adjacent to the bearing portion 43 of the weight 41, and the first locking portion 62
Is pressed against the back surface of the lid 20, and the second locking portion 63 is engaged with the engaging hole 49 provided in the weight 41, so that the arrangement space of the spring member 60 can be reduced. In addition, the lid floating prevention fitting 40 can be made compact. In addition, the operating protrusion 45 moves in the direction to close the tool insertion groove 21 by the elastic force in the winding direction accumulated in the spring member 60, and the locking protrusion 46 moves in the direction in which the locking protrusion 12 is engaged. Moving. In this case, the engagement between the locking projection 46 and the locking receiving portion 12 is further ensured by the elastic force in the winding direction and the elastic force in the direction perpendicular to the winding direction accumulated in the spring member 60. Therefore, the gravity of the weight 41 and the spring member 60
And the elastic force (spring force) of the tool insertion groove 21
Can be reliably closed and locked. In this case, the weight of the weight 41 can be made smaller than that of the conventional weight that rotates only by the gravity of the weight, so that the material of the lid floating prevention fitting 40 can be reduced.

The lid floating prevention fitting 4 configured as described above.
In order to attach the cover member 20 to the lid 20, first, the bent portion 63 a at the tip of the second locking portion 63 of the spring member 60 is connected to the concave base portion 42.
The coil portion 61 is disposed in the cutout portion 48 of the weight 41 by engaging with the engagement hole 49 formed in the side wall 47b of the weight 41. Next, with the first locking portion 62 pressed against the back surface of the lid 20, the bearing 43 of the lid floating prevention fitting 40, the coil portion 61 of the spring member 60, the shaft mounting recess 24 of the lid 20, and Shaft mounting hole 2
6 are arranged on the same line. Then, in this state, the connecting shaft 50 is inserted through the shaft mounting hole 26 in the order of the coil portion 61, the bearing portion 43, and the shaft mounting recess 24. At this time, the fixing bolt 70 is inserted through the bolt mounting hole 27 so that the connecting shaft 50
The first and second nuts 7 are held in a state where the other end faces of the
Tighten and fix 1,72.

As shown in FIG. 1, the hinge 30 is pivotally attached to a bracket provided on the back surface edge of the cover 20 opposite to the cover floating prevention fitting 40, and protrudes downward. A hinge main body 31 and a locking wing piece 32 projecting slightly below the intermediate portion of the hinge main body 31. A hinge seat 33 for detachably engaging the hinge 30 configured as described above connects a pair of side pieces 34 protruding inward from the inner peripheral surface of the receiving frame 10 to the distal ends of the both side pieces 34. The connecting piece 35 is formed in a substantially U-shape in plan view.

The manhole cover M configured as described above
As shown in FIG. 1, the lid 20 is connected to the receiving frame 10 by a hinge 30 so as to be openable and closable.
0, as shown in FIG. 1 and FIG.
0 elastic force is applied, and the locking convex portion 46 of the lid floating prevention metal fitting 40 is engaged with the locking receiving portion 12 of the receiving frame 10, and
The operation convex portion 45 of the lid floating prevention fitting 40 closes the tool insertion groove 21 of the lid 20 (see FIG. 3).

When the cover 20 of the manhole cover M is to be opened, the tip of the tool K such as a crowbar is connected to the operating projection 45 closing the tool insertion groove 21 of the cover 20 as shown in FIG. By contact and pressing, the operation convex portion 45 is lowered downward against the elastic force of the spring member 60, and the lid floating prevention metal fitting 4
0 rotates counterclockwise about the connecting shaft 50 in FIG. 4 and the locking projection 46 also rotates.
6 moves from the engagement position with the locking receiving portion 12 of the receiving frame 10, and the engaged state is released.

In this manner, when the engagement between the locking projection 46 of the lid floating prevention fitting 40 and the locking projection 46 of the receiving frame 10 is released, the tool K such as a bur is rotated 90 ° in the horizontal direction. Then, as shown by a two-dot chain line in FIG. 4, the hook of the tool K is engaged with the lower surface of the lid 20, and the lid 20 can be opened by lifting the hook of the tool K.

On the other hand, as described above, the cover 20 is
When the cover 20 is in the open state, the lid 20 is returned to the original position of the receiving frame 10 by performing the above procedure in reverse. That is, when the tool K is lowered to fit the lid 20 into the opening 11 of the receiving frame 10 and the tip of the tool K is removed from the tool insertion groove 21, the spring member 60 interposed on the connecting shaft 50 is removed.
The lid lifting prevention fitting 40 is rotated clockwise in FIG. 4 by the elastic force of FIG. 4, so that the locking projection 46 engages with the locking receiving part 12 of the receiving frame 10 and the clock of the lid lifting prevention fitting 40 is With the rotation in the direction, the operation protrusion 45 moves to the position of the tool insertion groove 21 of the lid 20, and the tool insertion groove 21 is closed by the operation protrusion 45.

Therefore, the manhole cover M configured as described above can be used when the pressure of rainwater, earth and sand, etc. is applied to the operation convex portion 45 of the cover floating prevention fitting 40 from the outside of the cover body 20 or when the manhole cover M is inclined. When installed on a road surface that has been set, the lid floating prevention fitting 40 engages the locking projection 46 and the locking receiving portion 12 with the elastic force of the spring member 60, and always keeps the receiving frame 10 locked. And the tool insertion groove 21
Is closed by the operation convex portion 45, so that rainwater and earth and sand are prevented from flowing into the underground structure from the tool insertion groove 21, and even if an air hammer or a water hammer phenomenon occurs in the underground structure, It is possible to eliminate the risk that the lid 20 comes off the receiving frame 10.

As shown in FIG. 9, by forming the tool insertion groove 21A of the lid 20 smaller than the tool insertion groove 21 in FIG. 8, the inflow of rainwater, earth and sand from the tool insertion groove 21A is further prevented. Can be suppressed. In addition,
In this case, the operation convex portion of the lid floating prevention fitting 40 may be formed according to the shape of the tool insertion groove 21A.

[0033]

As described above, since the present invention is configured as described above, the following excellent effects can be obtained.

(1) According to the first aspect of the present invention, the lid lifting prevention metal fitting has a resilient force in a direction in which the operation convex portion closes the tool insertion groove and a direction in which the locking convex portion engages with the locking receiving portion. The spring member that biases the rainwater and earth and sand from the outside is suppressed, and when the pressure of rainwater and earth and sand is applied to the operation convex part of the lid, or the manhole cover is inclined. When it is installed on a road surface that has been closed, the lid can always be forcibly locked to the opening of the receiving frame by the elastic force of the spring member, and an air hammer or water hammer phenomenon occurs in the underground structure. However, it is possible to eliminate the risk that the lid body comes off the receiving frame. Further, since it is not necessary to provide a cam for restricting the movement of the lid floating prevention fitting unlike the conventional rainwater inflow prevention and locking device, the lid can be easily processed.

(2) According to the second aspect of the present invention, the weight of the lid floating prevention fitting is formed by cutting out the concave base that opens to one side and the other upper part of the concave base. A coil portion wound around a shaft in a notch portion of the weight, and a first locking portion extending from one end of the coil portion and pressed against the back surface of the lid, provided with a bearing portion; And a second engaging portion extending from the other end of the coil portion and engaging with an engaging hole formed in the side wall of the concave base portion, so that the coil portion is formed in the notch portion of the weight. Since it is wound around the shaft, in addition to the above (1), the space for disposing the spring member can be reduced, the lid floating prevention fitting can be made compact, and the tool insertion groove can be closed and closed. Locking can be ensured. In this case, the bearing portion is slidably fitted to the connection shaft, and the coil portion of the spring member is contracted between the bearing portion and the lid, so that the elasticity in the axial direction orthogonal to the winding direction of the spring member is obtained. The engagement between the locking projection and the locking receiving portion can be further ensured by the force (claim 3).

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a locked state of a manhole cover provided with a rainwater inflow prevention and locking device for a manhole cover according to the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view showing a rainwater inflow prevention of a manhole cover and an unlocked state of a lock device according to the present invention.

FIG. 5 is a perspective view of a lid floating prevention fitting according to the present invention.

FIG. 6 is an exploded perspective view of the lid floating prevention fitting.

FIG. 7 is a bottom view showing a tool insertion groove of the lid according to the present invention.

FIG. 8 is a bottom view showing a part of a mounting state of a retaining bolt for retaining the connecting shaft in the present invention in cross section.

FIG. 9 is a bottom view showing a modification of the tool insertion groove in the present invention.

[Explanation of symbols]

 M Manhole cover 10 Receiving frame 11 Opening 12 Lock receiving portion 20 Lid 21, 21A Tool insertion groove 30 Hinge 40 Lid floating prevention fitting 41 Weight 42 Concave base 43 Bearing 45, 45A Working convex 46 Locking convex 48 Notch part 49 Engagement hole 50 Connecting shaft 60 Spring member 61 Coil part 62 First locking part 63 Second locking part

Claims (3)

[Claims] 1. A receiving frame having an opening, a lid attached to the opening of the receiving frame, and a hinge for connecting the lid to the receiving frame so that the lid can be opened and closed at one end of the lid, On the other end side of the lid, a manhole lid including a lid floating prevention metal fitting that can close the tool insertion groove provided in the lid and engage with the receiving frame, wherein the lid floating prevention metal fitting is: With a weight that rotates by gravity about a connection shaft that is laid horizontally on the lid,
On one side of the weight, an operating projection that closes the tool insertion groove, and a locking projection that removably engages with a locking receiving portion that is protruded inside the receiving frame, And a spring member for urging the elastic force in a direction in which the operation convex portion closes the tool insertion groove and in a direction in which the locking convex portion engages with the locking receiving portion. And locking device. 2. The rainwater inflow prevention and locking device for a manhole cover according to claim 1, wherein the weight of the lid floating prevention metal fitting has a concave base opening to one side and an upper other side of the concave base. A notch formed bearing portion, wherein the spring member has a coil portion wound around a connection shaft in the notch portion of the weight, and a coil member extending from one end of the coil portion and having a lid. A first locking portion that is in pressure contact with the back surface, and a second locking portion that extends from the other end of the coil portion and engages with an engagement hole formed in the side wall of the concave base. A rainwater inflow prevention and lock device for a manhole cover, characterized in that: 3. The rainwater inflow prevention and locking device for a manhole cover according to claim 2, wherein the bearing portion of the weight is slidably fitted to a connection shaft, and the coil portion is connected to the bearing portion and the lid. A rainwater inflow prevention and lock device for a manhole cover, characterized in that it is contracted between the manhole cover.