JP4505174B2 - Cover for underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid for an underground structure.
As used herein, “underground structure lid” refers to a large iron lid, a manhole lid, a sewage culm lid, an electric / Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids, buried underground pipes in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, etc., that function as an open / close door.
[0002]
[Prior art]
Conventionally, as a lid for an underground structure having a structure in which the lid body is fitted and supported on the receiving frame by causing the outer circumferential slope surface of the lid body to bite into the inner circumferential slope surface of the receiving frame, for example, Japanese Patent Laid-Open No. 53-72357. A round manhole described in the Gazette is known. This round manhole can be manufactured easily and inexpensively by increasing the load strength of the manhole cover by limiting the inclination angle of the inclined surface to 5 ° to 10 °. A sufficient amount of bite and bite force can be ensured, rattling, vibration, and noise of the manhole cover can be significantly suppressed, and there is an effect that almost no sliding occurs.
[0003]
[Problems to be solved by the invention]
However, the round manhole having the above-described conventional structure has the above-described effects, but depending on the installation environment, excessive bite into the receiving frame of the lid body may occur. A large amount of labor may be required, making the opening operation difficult.
[0004]
The present invention has been made in view of the above points, and it is possible to prevent the lid body from excessively biting into the receiving frame, and to provide a lid for an underground structure that can be performed with moderate labor when the lid is opened with a bar. The purpose is to provide.
[0005]
[Means for Solving the Problems]
The present invention relates to a lid for an underground structure in which the outer peripheral gradient surface of the lid body is fitted and supported by the inner peripheral gradient surface of the receiving frame, and an upper portion of the outer peripheral gradient surface of the lid body and an upper portion of the inner peripheral gradient surface of the receiving frame. Rutotomoni a clearance portion opening upward is formed around the entire circumference of at least one of the lid body or receiving frame, the height of the gap portion is higher than the thickness of the top plate of the lid body between, and the gap The cover body is mounted on the receiving frame by taper-fitting the outer peripheral slope surface of the cover body and the inner peripheral slope surface of the receiving frame over the entire circumference, and the edge winding of the lid body forming the outer peripheral slope surface It is set as the structure which opened the lower end inner peripheral side of the part.
In the configuration described above, the lid body is supported by the receiving frame while the lower part of the outer peripheral gradient surface is taper-fitted to the lower part of the inner peripheral gradient surface of the receiving frame over the entire circumference, suppressing rattling, vibration, noise, and the like. In other words, the height of the gap portion opening upward in between the top of the outer circumferential slope surface of the upper and the lid body of the inner circumferential slope surface of the receiving frame (depth) is greater than the thickness of the top plate of the lid body ( Therefore , the top of the lid body is not constrained by the receiving frame, and the lower portion of the outer peripheral slope surface of the lid body and the lower portion of the inner peripheral slope surface of the receiving frame are merely taper-fitted to each other . Therefore, the reaction force that the outer peripheral gradient surface of the lid body receives from the inner peripheral gradient surface of the receiving frame is reduced, and it is reduced that the lid body bites into the receiving frame excessively regardless of the installation environment. As a result, the lid body can be opened with the bar without applying excessive force, and the opening operation is facilitated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, it has set the size of the gap portion as viewed in the radial direction of the lid body about 0.2 mm, and the gap portion, one at least of the inner circumferential slope surface of the outer peripheral inclined face or receiving frame of the lid body One of them is cut away .
By adopting such a configuration, the degree of freedom of design increases, and an optimum one according to the shape, size, installation environment, etc. of the underground structure lid can be set.
[0007]
Et al is, in the present invention, a hinge mechanism connecting the lid body and the receiving frame, and a lid opening capable locking mechanism in the unlocked state impossible open lid in the locked state, the lid body wherein in the locked state It is configured to be able to float with respect to the receiving frame.
[0008]
With such a configuration, the lid body can be lifted with respect to the receiving frame within the range in which the hinge mechanism and the locking mechanism engage with the receiving frame. body frees the Age圧slightly floated in the air, to reduce the internal pressure underground construction. As a result, it is possible to prevent the receiving frame from rising and prevent the road surface around the receiving frame from being damaged.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a lid for an underground structure according to the present invention, and FIG. 2 is a partially enlarged view of a fitting portion between the receiving frame and the lid body of FIG.
As shown in FIG. 1, the lid 1 for an underground structure has a circular shape in a plan view constituted by a round receiving frame 2 and a round lid main body 3 attached to the receiving frame 2 by taper fitting. The lid body 3 is installed so as to be flush with the ground surface. In the taper fitting, as shown in FIG. 2, the outer periphery of the edge winding portion 3a of the lid body 3 is reduced in diameter downward to the inner slope surface 2a in which the upper inner circumference of the receiving frame 2 is reduced in diameter downward. The structure which fits the outer periphery gradient surface 3b is said. The lid body 3 is connected to the receiving frame 2 by a hinge mechanism 4 provided on one side, and is engaged with the receiving frame 2 by a locking mechanism 5 provided on the other side to open and lift by a third party. Spattering is prevented. When the lid body 3 is opened, an indented portion formed at the tip of a bar as a lid-dedicated tool is inserted into an opening 3c provided on the outer peripheral edge of the lid body 3, and the locking mechanism 5 is unlocked. The bar is pulled up above the receiving frame 2 and is opened through a hinge mechanism 4 by horizontal turning or vertical reversal.
[0010]
The locking mechanism 5 includes a lock seat 2b provided at a lower portion of the inner peripheral slope surface 2a of the receiving frame 2 and a lock rod 7 rotatably attached to a support portion 6 formed on the lower surface of the lid body 3. When the lid body 3 is lifted by a jig or the like other than the opening-dedicated tool or when the lid body 3 is pushed up by the lifting pressure inside the underground structure, the engagement protrusion 7a of the locking rod 7 is provided on the lock seat 2b. The locking projection 2c can be engaged to prevent the lid from being opened or scattered.
[0011]
As shown in FIG. 2, the outer peripheral gradient surface 3b of the edge winding portion 3a of the lid body 3 has a slight upper portion from the upper end to a predetermined height, for example, approximately 1/3 to 1/2 of the total height. The upper outer peripheral gradient surface 3d is cut out, and is formed concentrically with the lower portion 3e of the outer peripheral gradient surface 3b (hereinafter referred to as “lower outer peripheral gradient surface 3e”). The lower outer peripheral gradient surface 3e is taper-fitted to the lower portion of the inner peripheral gradient surface 2a of the receiving frame 2. The lid body 3 opens upward between the upper outer peripheral gradient surface 3d and the upper portion of the inner peripheral gradient surface 2a in a state where the lower outer peripheral gradient surface 3e is taper-fitted with the lower portion of the inner peripheral gradient surface 2a of the receiving frame 2. An annular gap g is formed. Note that the height of the upper outer peripheral gradient surface 3d is higher than the thickness of the top plate 3f in order to reduce the reaction force that the outer peripheral gradient surface 3b of the lid body 3 receives from the inner peripheral gradient surface 2a of the receiving frame 2 as will be described later. It is preferable to do. The annular gap g is preferably as narrow as possible in order to make it difficult for earth and sand to enter. As an example, when the outer diameter of the lid body 3 is set to 634 mm, the inclination angle of the outer peripheral gradient surface 3 b is set to about 8 °, and the height of the outer peripheral gradient surface 3 b is set to 37.5 mm, the height of the lower outer peripheral gradient surface 3 e Is set to 20 mm or less, and the gap g is set to about 0.2 mm.
[0012]
The lid body 3 has a lower outer peripheral gradient surface 3 e taper-fitted to a lower portion of the inner peripheral gradient surface 2 a of the receiving frame 2. As a result, the lid body 3 is fitted and supported on the receiving frame 2 while suppressing rattling, vibration, noise, and the like. Since the lid body 3 is integrally formed with the top plate 3f at the upper part, the upper part has high rigidity, and the deformation of the upper part of the edge winding part 3a is small. For this reason, if the upper outer peripheral gradient surface 3d is configured to be continuous with the lower outer peripheral gradient surface 3e, the upper portion of the inner peripheral gradient surface 2a of the receiving frame 2 with which the upper outer peripheral gradient surface 3e abuts is distorted. A large tightening force will be generated. On the other hand, in the present invention, an annular gap g that opens upward is formed between the upper part of the inner peripheral slope surface 2a of the receiving frame 2 and the upper part of the outer peripheral slope surface 3b of the lid body 3. The reaction force from the receiving frame 2 does not act on the upper part of the lid body 3.
[0013]
On the other hand, the lower end of the edge winding portion 3a has no top plate and is an opening, and therefore has lower rigidity than the upper portion, and is easily distorted and deformed. For this reason, when the lid main body 3 is fitted to the receiving frame 2, no reaction force from the receiving frame 2 acts on the upper portion of the lid main body 3, whereas the lower portion of the inner peripheral inclined surface 2 a of the receiving frame 2 and the lid main body 3. The lower outer peripheral gradient surface 3e tends to be slightly distorted and deformed.
[0014]
Therefore, the reaction force that the outer peripheral gradient surface 3b of the lid body 3 receives from the inner peripheral gradient surface 2a of the receiving frame 2 is reduced. Thereby, regardless of the installation environment of the lid 1 for an underground structure, it is reduced that the lid body 3 bites into the receiving frame 2 excessively. Therefore, it is possible to perform the lid opening operation of the lid body 3 with the bar without applying an excessive force.
When the lid body 3 is opened, the indented portion of the exclusive bar is inserted into the opening 3c of the lid body 3, the upper surface of the locking rod 7 is pressed, and the engaging projection 7a is separated from the collar 2b to lock the locking mechanism. 5 is unlocked, the bar is pulled up, the lid body 3 is lifted, and the lid is opened. This opening operation can be easily performed without applying an excessive force as described above.
[0015]
When the lid body 3 is closed, the locking rod 7 is left in a free state, and the lid body 3 is fitted to the receiving frame 2 as it is, so that the locking rod 7 is positioned at the center of gravity of the weight portion 7b with the support shaft 7c as the center. It is rotated by the action of and is locked at the locking position.
The lid body 3 is connected to the receiving frame 2 by a hinge mechanism 4 provided on one side, and can be engaged with the receiving frame 2 by a locking mechanism 5 provided on the other side, whereby the hinge mechanism 4 and the locking mechanism The lid body 3 can be lifted with respect to the receiving frame 2 within a range where 5 is engaged with the receiving frame 2. Further, as described above, excessively biting the lid body 3 into the receiving frame 2 is reduced, so that when the lifting pressure is generated inside the underground structure, the lid body 3 is surely lifted and the lifting body is lifted. It frees the pressure to the atmosphere, to reduce the internal pressure underground construction. This prevents the receiving frame 2 from rising and prevents the road surface (asphalt) around the receiving frame from being damaged.
[0016]
FIG. 3 shows another embodiment of the lid for an underground structure according to the present invention, wherein the outer peripheral gradient surface 3b of the lid main body 3 has a shape obtained by extending the lower outer peripheral gradient surface 3e to the upper portion, and the inner peripheral gradient of the receiving frame 2 A gap portion g is provided by providing a notch on the surface 2a side. That is, the upper part of the inner peripheral gradient surface 2a is slightly cut out over the entire circumference from the upper end to a height position of approximately 1/2 to 1/3 of the total height to form the upper inner peripheral gradient surface 2d. It is formed concentrically with a lower portion 2e of the inner peripheral gradient surface 2b (hereinafter referred to as “lower inner peripheral gradient surface 2e”). Then, the lower inner peripheral gradient surface 2 e is taper-fitted with the lower portion of the outer peripheral gradient surface 3 b of the lid body 3. The lid body 3 has a lower portion of the outer peripheral gradient surface 3b taper-fitted with a lower inner peripheral gradient surface 2e of the inner peripheral gradient surface 2a of the receiving frame 2, and an upper portion of the outer peripheral gradient surface 3b and an upper inner peripheral gradient surface 2d of the receiving frame 2. An annular gap g that opens upward is formed. Thereby, it is reduced that the cover main body 3 bites into the receiving frame 2 excessively.
[0017]
FIG. 4 shows another embodiment of the lid for an underground structure according to the present invention, in which the upper and lower portions of the outer peripheral gradient surface 3b of the lid body 3 are slightly cut out concentrically over the entire circumference. A surface 3d and a lower outer peripheral gradient surface 3g are provided, and a belt-like outer peripheral gradient surface 3e (hereinafter referred to as "intermediate outer peripheral gradient surface") at the center is taper-fitted with the inner peripheral gradient surface 2a of the receiving frame 2. The lid body 3, middle outer peripheral inclined face 3e is fitted central portion and the tapered inner peripheral slope surface 2a of the receiving frame 2, the upper outer peripheral inclined surface 3d, the lower outer peripheral inclined face 3g and receiving frame 2 inner circumferential slope surface 2 a of the Between the upper part and the lower part, annular gaps g and g ′ that open upward and downward are formed. Thereby, it is reduced that the cover main body 3 bites into the receiving frame 2 excessively.
[0018]
In each of the above embodiments, the upper part of the outer peripheral gradient surface 3b of the lid body 3 or the upper part of the inner peripheral gradient surface 2a of the receiving frame 2 is cut out over the entire circumference, and these outer peripheral gradient surface 3b and inner peripheral gradient surface. to form an annular clearance g opening upward between 2a but not limited thereto, but it may also be cut out both gradient surface. By adopting such a configuration, the degree of freedom in design increases, and an optimal one corresponding to the shape, size, and installation environment of the lid for the underground structure can be set.
[0019]
In addition, the shape and size of the lid main body 3 are merely examples, and are not limited to the above-described size and shape. The lid body 3 is fitted with the outer peripheral gradient surface 3b of the cover body 3 biting into the inner peripheral gradient surface 2a of the receiving frame 2. In the lid for an underground structure having a joint support structure, it is sufficient that a gap portion g that opens upward is formed between the lid body 3 and the upper part of the inclined surface of the receiving frame 2 and is limited in shape and size. is not. Further, the shape of the lid body 3 is not limited to a round shape, and may be a square shape.
[0020]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, the lid body can be prevented from rattling by the taper fitting between the lid body and the receiving frame , while the gap portion has a height of the top plate of the lid body. Since it is higher than the thickness, the reaction force applied from the inner peripheral slope surface of the receiving frame to the outer peripheral slope surface of the lid body is reduced, and it can be reduced that the lid body bites into the receiving frame excessively regardless of the installation environment. The opening operation with the bar can be performed without excessive force, and the work can be reduced.
[0021]
According to invention of Claim 3 , the freedom degree of design increases and the optimal thing according to the shape of the lid | cover for underground structures, a magnitude | size, installation environment, etc. can be set .
[0022]
According to the invention of claim 4, when the lift pressure inside underground structures occurs, the Age圧vacuo and release solutions to the air cap body is slightly floated, preventing floating of the lid body and the receiving frame Thus, it is possible to prevent the road surface around the receiving frame from being damaged.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of an underground structure lid according to the present invention.
FIG. 2 is a partially enlarged view of a fitting portion between the receiving frame and the lid body shown in FIG.
3 is a partially enlarged view showing another embodiment of the fitting portion between the receiving frame and the lid body shown in FIG.
4 is a partially enlarged view showing another embodiment of the fitting portion between the receiving frame and the lid body shown in FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Subsurface structure lid 2 Receiving frame 2a Inner peripheral gradient surface 2b Lock seat 2d Upper inner peripheral gradient surface 2e Lower inner peripheral gradient surface 3 Lid body 3b Outer peripheral gradient surface 3d Upper outer peripheral gradient surface 3e Middle outer peripheral gradient surface 3f Top plate 3g Lower Gradient surface 4 Hinge mechanism 5 Locking mechanism 7 Locking rods g, g 'Gap

Claims (4)

In the lid for an underground structure in which the outer peripheral slope surface of the lid body is fitted and supported by the inner peripheral slope surface of the receiving frame,
The clearance portion opening upward Ru is formed over the entire circumference at least one of the lid body or the receiving frame between an upper part of the inner circumferential slope surface of the upper and the receiving frame of the outer inclined surface of the lid body And the height of the gap is higher than the thickness of the top plate of the lid body,
While attaching the lid body to the receiving frame by taper fitting the outer peripheral slope surface of the lid body excluding the gap and the inner peripheral slope surface of the receiving frame over the entire circumference,
A lid for an underground structure, wherein a lower end inner peripheral side of an edge winding portion of the lid main body forming the outer peripheral gradient surface is opened.   The underground structure lid according to claim 1, wherein a size of the gap portion as viewed in a radial direction of the lid body is set to about 0.2 mm. The gap portion, underground structures lid according to claim 1 or 2 was formed by cutting out at least one of the inner circumferential slope surface of the outer peripheral inclined face or receiving frame of the lid body. A hinge mechanism that connects a lid body and a receiving frame, and a locking mechanism that cannot be opened in a locked state and can be opened in an unlocked state, and the lid body can float with respect to the receiving frame in a locked state. Item 4. A lid for an underground structure according to any one of Items 1 to 3 .

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