JPH10231531A - Locking structure for cover for underground construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking construction in which unlocking will not occur even by uplift pressure generated inside an underground structure, in which a cover can be opened and unlocked by cover opening operation without requiring unlocking operation separate from the cover opening operation. SOLUTION: In a locking structure for a cover for an underground construction, an engagement part 7 is provided on a back surface of a cover main body 2, and a lock part 8 to be engaged with the engagement part 7 is provided on a bearing frame 1 on which the cover main body 2 is placed. In this case, at least either of the engagement part 7 and the lock part 8 is installed to be movable to/from the cover main body 2 by the bearing frame 1, and the engagement part 7 and the lock part 8 are composed in such a way that a tip part of the engagement part 7 is applied to a tip part of the lock part 8 in opening/closing operation of the cover main body 2 to retract the engagement part 7 or the lock part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for an underground structure, and more particularly, to a locking structure for a cover for an underground structure which enables a lid body and a receiving frame on which the lid is mounted to be locked.

The term "cover for underground structures" as used in the specification of the present application refers to a large iron cover, a manhole cover, a sewage basin cover for closing an opening through an underground buried object, underground structure facility, etc. in the sewer and the ground. Opening / closing iron lids for power supply and telecommunications, underground facilities and underground cables, open and closed iron gutters, power transmission irons, power distribution iron lids, underground pipes for water supply and gas piping, and their auxiliary equipment and ground equipment A fire hydrant cover, a water valve cover, a partition valve cover, an air valve cover, a gas pipe cover, a water meter cover, and the like having a function as an opening / closing door connecting the above.

[0003]

2. Description of the Related Art Various lids for underground structures include a receiving frame installed at an upper end of the underground structure and a lid body supported by taper fitting or the like. It is a general configuration to provide a locking structure for locking the lid body and the receiving frame while connecting the lid to the receiving frame by a hinge structure so that the lid can be opened and closed.

[0004] As such a locking structure for a lid for an underground structure, for example, a locking structure described in Japanese Utility Model Publication No. 3-3642 discloses an operation in which a lock rod is provided on the back surface of a lid body and integrally attached to the lock rod. Locking and unlocking are performed by moving the lock rod in the radial direction of the lid body by operating the rod, and in the locked state, the lock rod enters the lock hole provided in the receiving frame and the lid body is locked. Thus, even if an air hammer or a water hammer phenomenon occurs inside the underground structure and a lifting pressure occurs, the locked state is reliably maintained and the lid body is prevented from scattering.

[0005]

However, in the above locking structure, when it is necessary to open the lid main body, first, the operating rod of the lock device is lifted and moved toward the center of the lid main body to unlock. Later, it is necessary to hook a hook into a hook provided near the lock device and pull up the lid body. As described above, since it is necessary to perform the opening operation after performing the unlocking operation, the opening operation is troublesome, and in particular, lids for underground structures such as a fire hydrant iron lid, a power distribution iron lid, and a gas piping iron lid. When it is necessary to open the lid in an emergency, there is a problem that it takes time to open the lid and cannot respond quickly.

According to the present invention, the door is not unlocked by the lifting pressure generated inside the underground structure, and when the lid is opened, the unlocking operation is not performed separately from the opening operation. An object of the present invention is to provide a locking structure of a lid for an underground structure capable of unlocking and opening.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a locking structure for a cover for an underground structure, wherein an engaging portion is provided on a back surface of the lid body, and the engaging frame is engaged with a receiving frame on which the lid body is placed. A locking structure for a lid for an underground structure provided with a portion, wherein at least one of the engaging portion and the locking portion is attached to the lid body or the receiving frame so as to be able to advance and retreat, and is locked with the engaging portion. The part is configured such that, when the lid body is opened and closed, the distal end of the engaging part and the distal end of the locking part abut against each other, so that the engaging part or the locking part is retracted.

With such a configuration, in the closed state, the engaging portion engages with the locking portion, so that the locked state is reliably maintained. At the time of opening and closing the lid, the engaging portion or the locking portion retreats, so that the lid main body can be smoothly opened and closed without performing a special operation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, at least one of the engaging portion and the engaging portion has a convex top surface, and the upper surface of the engaging portion and the lower surface of the engaging portion are opened. The second inclined surface or the first inclined surface and the second inclined surface that face each other when the lid is closed to the first inclined surface or the lower surface of the engaging portion and the upper surface of the locking portion that face each other. It is preferable to provide an inclined surface. With such a configuration, the forward / backward movement of the engaging portion or the locking portion at the time of opening and closing the lid becomes smooth.

[0010]

FIG. 1 is a bottom view showing an entire embodiment of a lid for an underground structure to which a locking structure according to the present invention is applied, and FIG.
FIG. 3 is an exploded perspective view showing a main part of the locking structure of the present invention.

As shown in FIG. 1 or FIG. 2, a cover M for an underground structure includes a receiving frame 1 and a lid main body 2 supported by a tapered fitting to the receiving frame 1, and the upper surface thereof is substantially the same as the ground surface (GL). The lid main body 2 is installed so as to be flush with the lid frame 2 and is hingedly connected to the receiving frame 1 by a hinge structure 3 provided on the back side peripheral edge side.

A bag-shaped burr hole 4 is provided at a position opposite to the hinge structure 3. A burl is hooked into the burl hole 4, and the lid main body 2 is positioned on the opposite side of the hinge frame 3 with respect to the receiving frame 1. After being pulled up diagonally upward, the lid main body 2 can be opened by horizontal turning or vertical inversion.

On the back side of the lid body 2, an engagement portion 7 provided on the back surface of the lid body 2 and an inner periphery of the receiving frame 1 are provided at positions symmetrical with respect to the burl hole 4 as described later. A locking structure 5 including a locking piece 8 is provided, and a lid body 2 and a receiving frame 1 are provided.
And can be locked.

As shown in FIG. 2 or FIG. 3, on the back surface of the lid body 2, a hanging portion 6 is integrally provided so as to protrude downward, and furthermore, is engaged continuously from the lower end of the hanging portion 6. The portion 7 protrudes outward from the lid main body 2, and the planar shape of the distal end of the engaging portion 7 is an arc shape (convex shape) convex toward the outer periphery of the lid main body 2. The protrusion length of the engaging portion 7 is set so that the distal end of the engaging portion 7 does not abut against the inner periphery of the receiving frame 1 when the cover is closed so that the cover body 2 can be closed.

At the tip of the engaging portion 7, a first inclined surface 7a is provided on the upper surface on the corner side of the burl hole 4 side, and a second inclined surface 7b is provided on the lower surface on the other corner side. I have. First slope 7
a has a downward slope toward the outside of the lid body 2, and the second inclined surface 7 b has an upward slope toward the outside of the lid body 2.

The receiving frame 1 is provided with a storage portion 1a whose inner peripheral side is open at a position aligned with the above-mentioned engaging portion 7, and a spring 9 is mounted on the projection 1b in the storage portion 1a. , 2
By inserting the bolts 10a, 10a from the bottom side of the receiving frame 1 into the long holes 8c, 8c of the locking piece 8, the locking piece 8
Are attached so as to be able to advance and retreat in the radial direction of the receiving frame 1.
In the above-described embodiment, the locking piece 8 can be advanced and retracted by using the elastic force of the spring 9, but an elastic body such as rubber or sponge may be used instead of the spring.

The planar shape of the tip of the locking piece 8 is an arc (convex) that is convex toward the center of the receiving frame 1.

At the tip of the locking piece 8, the cover body 2 is
A first inclined surface 8a is provided on the lower surface on the corner side which is the side of the burl hole 4 when placed on the surface, and a second inclined surface 8b is provided on the upper surface on the other corner side. The first inclined surface 8a has a downward slope toward the outside of the receiving frame 1, and the second inclined surface 8b has
It has an upward slope toward the outside of the receiving frame 1.

Next, the operation of the locking structure of the present invention will be described. FIG. 4 shows a locked state, FIG. 4- (a) is a cross-sectional view, FIG. 4- (b) is a half bottom view, and FIG. 5 is a cross-sectional view showing a state in which the lid body floats. In the locked state, as shown in FIG. 4, the engaging portion 7 is positioned so as to overlap below the locking piece 8. Therefore, in this state, even if the lifting pressure due to the air hammer or the water hammer phenomenon acts on the lid main body 2 and the lid main body 2 rises almost right above, the engaging portion 7 is locked as shown in FIG. 8, the lid body 2 does not open or scatter.

FIGS. 6 and 7 are explanatory views of the unlocking operation of the locking structure when the lid body 2 is opened. When the cover is opened, the tip of a dedicated bar (not shown) is inserted into the burl hole 4 to release the taper fitting between the cover body 2 and the receiving frame 1. Subsequently, when the lid body 2 is pulled obliquely upward (in the direction of the arrow in the figure) so as to be pulled toward the user (see FIG. 6A), the bur hole 4 of the engagement portion 7 shown in FIG. The first inclined surface 7a which is closest to the first surface and the first inclined surface 8a of the locking piece 8 face each other (the state of FIG. 6B).

When the lid body 2 is further pulled up, the engagement portion 7
Of the engaging piece 8, which abuts against the tip of the engaging portion 7, and the contact point between the tips moves in the direction away from the burl hole 4 as the lid body 2 is pulled up. Then, it gradually retreats from the corner side near the burl hole 4 (see FIGS. 6 (b) to (c)).

When the apexes of the tips of the engaging portion 7 and the locking piece 8 abut against each other, the locking piece 8 is in the most retracted state, and is almost completely stored in the storage portion 1a of the receiving frame 1. (See FIG. 7- (a)).

When the lid body 2 is further pulled up, the engaging portion 7
Passes above the locking piece 8, the engagement between the engaging portion 7 and the locking piece 8 is released, and the lock is unlocked. At the same time, the locking piece 8
Due to the restoring force of the spring 9, the spring 9 projects again at a position below the engaging portion 7 (see FIG. 7B).

FIGS. 8 and 9 are explanatory views of the locking operation of the locking structure when the lid body 2 is closed. When the lid is closed, the lid body 2 is pushed obliquely downward (in the direction of the arrow in the figure) into the receiving frame 1 by pushing the lid body 2 toward the hinge structure 3 with a dedicated bar (not shown) (FIG. 8A). reference). Then, first, the second inclined surface 7b of the engaging portion 7 shown in FIG. 2 which is the farthest from the burl hole 4 and the second inclined surface 8b of the locking piece 8 face each other. (State of FIG. 8B).

When the lid body 2 is further dropped, the locking pieces 8
Is a corner portion separated from the burl hole 4 by the contact of the abutting portions of the engagement portions 7 moving toward the burl hole as the lid body 2 is dropped. Retreat little by little from the side (Fig.
(See (b) to (c)).

When the apexes of the tips of the engaging portion 7 and the locking piece 8 abut against each other, the locking piece 8 is in the most retracted state, and is almost completely stored in the storage portion 1a of the receiving frame 1. (See FIG. 9- (a)).

When the lid body 2 is further dropped, the engaging portion 7
Penetrates below the locking piece 8, and at the same time, the locking piece 8
Is projected again by the restoring force of the spring 9, the engaging portion 7 is positioned below the locking piece 8, and is locked (see FIG. 9- (b)).

In the above-described embodiment, the engaging portion is fixed and the locking piece can be moved forward and backward. Conversely, the engaging portion can be moved forward and backward, and the locking piece may be fixed. Alternatively, both the engaging portion and the locking piece may be configured to be able to advance and retreat.

Although the shapes of the engaging portion and the tip of the locking piece are arc-shaped in the above embodiment, the shape is not limited to this. The engagement portion or the locking piece may be retracted by abutting the tip portion, and may be formed in a triangular or trapezoidal shape. Also, the shape of the tip of the engaging portion and the locking piece is preferably that both of them are convex in that the opening and closing of the lid can be performed smoothly, but it is also possible to make only one of them convex. Good.

In the above embodiment, the lid body and the receiving frame are connected by a hinge structure, and two locking structures are provided on opposite sides.
Only one is acceptable. However, in order to reliably prevent the lid body from scattering, it is preferable to provide two as in the embodiment. If a locking structure is provided instead of the hinge structure, the lid body can be removed from the receiving frame.

The burl hole is not limited to a bag-shaped burr hole, and may be an open burr hole penetrating to the back surface side of the lid body as conventionally generally used.
However, it is preferable to use a bag-shaped bur hole in that rainwater, earth and sand, and the like can be prevented from entering the underground structure.

Furthermore, the lid main body and the receiving frame are not limited to round shapes, and the locking structure of the present invention can be applied even if they are square shapes.

[0033]

【The invention's effect】

(1) When the lid body is pulled out of the receiving frame, the distal end of the engaging portion abuts against the distal end of the engaging portion, and the engaging portion or the engaging portion is retracted to be unlocked. The lid main body can be opened without performing the unlocking operation.

(2) When the lid body is closed, the engaging portion or the locking portion is similarly retracted, so that the lid can be smoothly closed, and after the lid is closed, the locking state is automatically established. So you never forget to lock.

(3) In the locked state, even if the lid body floats due to the lift generated in the underground structure,
Since the engaging portion is securely engaged with the locking portion, the lid body can be prevented from being opened and scattered.

(4) The flat shape of the front end of the engaging portion or the locking portion is made convex or the front end portion is provided with an inclined surface that faces when the lid is opened or closed. The operation of the lid and the lid can be performed more smoothly.

[Brief description of the drawings]

FIG. 1 is a bottom view showing the entirety of an embodiment of a lid for an underground structure to which a locking structure of the present invention is applied.

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

FIG. 3 is an exploded perspective view of the locking structure of the present invention.

FIG. 4 shows a locked state, FIG. 4- (a) is a cross-sectional view, and FIG. 4- (b) is a half bottom view.

FIG. 5 is a cross-sectional view showing a state in which the lid main body floats.

FIG. 6 is an explanatory view of an unlocking operation of the locking structure of the present invention.

FIG. 7 is an explanatory view of an unlocking operation of the locking structure of the present invention.

FIG. 8 is an explanatory diagram of a locking operation of the locking structure of the present invention.

FIG. 9 is an explanatory diagram of a locking operation of the locking structure of the present invention.

[Explanation of symbols]

 M Underground structure lid 1 Receiving frame 1a Storage section 2 Lid body 3 Hinge structure 4 Bar hole 5 Locking structure 6 Hanging part 7 Engaging part 7a First inclined surface 7b Second inclined surface 8 Locking piece (locking part) 8a 1st inclined surface 8b 2nd inclined surface 8c slot 9 spring 10a bolt 10b washer

Claims (4)

[Claims] 1. A locking structure for a lid for an underground structure, comprising: an engaging portion provided on a back surface of a lid main body; and a receiving portion on which the lid main body is placed, provided with a locking portion engaging with the engaging portion. At least one of the engaging portion and the engaging portion is attached to the lid body or the receiving frame so as to be able to advance and retreat, and the engaging portion and the engaging portion are engaged with each other when the lid body is opened and closed. A locking structure for a lid for an underground structure, wherein the engaging portion or the locking portion is retracted by abutting the distal end portion with the distal end portion of the locking portion. 2. The underground structure lid locking structure according to claim 1, wherein at least one of the engaging portion and the locking portion has a convex shape at the tip end. 3. The underground structure according to claim 1, wherein first inclined surfaces that face each other when the lid is opened are formed on an upper surface of the engaging portion and a lower surface of the locking portion. Locking structure for object lid. 4. The lower surface of the engaging portion and the upper surface of the locking portion are formed with second inclined surfaces that face each other when the lid is closed. Underground structure lid locking structure.