JP2003119812A - Lid for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole lid having a heat insulator which can be easily removed from or attached to the lid body, on the back of the lid body. SOLUTION: An upwardly extending fixing cylindrical part 67 having an inwardly projecting part 69 inside is provided in a position on the outer periphery of the bottom of the support member 15 accommodating the heat insulator, in a position corresponding to an air hole 25, with the cylindrical part penetrating the heat insulator. A bolt 71 is passed through the air hole 25 and an external thread on the end of the bolt 71 is set to enter the cylindrical part 67 and pass through the inwardly projecting part 69 and is drive into a nut 73 which is locked inside the cylindrical part 67 under the inwardly projecting part 69.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for an underground structure such as a lid for a manhole installed in an opening of a manhole.

[0002]

2. Description of the Related Art As a lid for a manhole, a plate-shaped lid made of a metal material is used, and when the manhole is open to the road surface, the surface is made to be at the same level or almost the same height as the road surface. In addition, a plate-shaped manhole cover is installed so as to close the opening of the manhole.

By the way, in cold regions, the road surface becomes snowy in winter, but since the manhole cover is warmed by heat from the ground such as sewage heat, there is thick snow around the manhole cover. Accumulation, however, the snow melts on the manhole cover and there is no snow, and road conditions often occur, for example, the snow around the manhole cover is frozen. In such a road surface condition, the manhole cover part is depressed and a step is generated, so when the vehicle passes over the manhole cover, the vehicle body collides with the snow around the manhole cover and the vehicle is damaged. In addition, there is a possibility that an accident may occur because the vehicle traveling direction cannot be controlled, and there are many dangers in the traffic of the vehicle.

[0004]

In order to prevent the road surface from being in such a state, it is necessary to provide a heat insulating material so that sewage heat and the like are not transmitted to the manhole cover.
If the heat insulating material is installed in the manhole separately from the manhole cover when installing the heat insulating material, the manhole cover opening / closing work and the heat insulating material opening / closing / removing / installation work should be performed when it is necessary to enter the manhole. Must be done and the work is tedious. Therefore, it is advisable to provide the heat insulating material integrally with the manhole cover on the back side of the manhole cover (cover body).

In order to integrally provide the heat insulating material with the manhole cover, the heat insulating material may be fixed to the back surface of the manhole cover with an adhesive. However, when the manhole cover is provided with a heat insulating material in the summer, the heat of the manhole cover does not escape into the manhole, so that the manhole cover becomes extremely hot. Therefore, it is preferable that the heat insulating material be removed from the manhole cover at the end of the snowfall season and attached to the manhole cover at the arrival of the snowfall season. Is annoying. In addition, a reinforcing rib is often provided on the back surface of the manhole cover, and the work of attaching the heat insulating material is not easy if an adhesive is used.

[0006] Therefore, an object of the present invention is to provide a manhole cover having a heat insulating material on the back side of the lid body, and the heat insulating material can be easily removed from the lid body or easily attached to the lid body. To do.

[0007]

A lid for an underground structure of the present invention to achieve this object is a plate-shaped metal lid main body and, for example, the back side of the lid main body entirely or almost entirely. A lid for an underground structure, comprising: a heat insulating material attached to a back surface of the lid main body so as to cover the heat insulating material, wherein the heat insulating material is releasable, for example, by means of a mechanical coupling structure. It is detachably provided on the lid body. In the present invention, since the heat insulating material is attached to the lid body using a releasable means such as a mechanical coupling means instead of an adhesive, the heat insulating material can be easily attached to the lid body regardless of the shape of the back surface of the lid body. Alternatively, the coupling means may be configured to be easily released to facilitate removal of the insulation. As the releasable means, for example, a bolt and a nut that connect the lid body and the heat insulating material side can be used.

The lid body is usually formed with a vent hole for discharging the gas filled in the manhole to the ground. For example, the vent hole is used and a bolt is passed through the vent hole. Can be screwed into the nut to form releasable means adapted to the purpose of the present invention. Utilizing the ventilation holes of the lid body, and
When constructing a releasable means using bolts and nuts, arrange the bolts so that the male screw end of the bolt penetrates the ventilation hole from the heat insulating material side, and the male screw end that penetrates the ventilation hole is Make sure that it is screwed into the nut, or place the bolt through the ventilation hole from the lid body side,
On the heat insulating material side, the male threaded portion of the tip of the bolt can be screwed into the nut. The configuration on the heat insulating material side may be only a heat insulating material or a combination of a heat insulating material and a supporting member (heat insulating member).

It is preferable that the releasable means is configured so as not to project from the surface of the lid body. Therefore,
The surface side of the ventilation hole of the lid main body is formed as a large diameter portion, and the head is fitted into the large diameter portion, and the bolt is formed so as not to project from this large diameter portion. It is effective to configure the releasable means so that the male screw end of the bolt penetrating the ventilation hole is screwed into the nut on the heat insulating material side. Alternatively, a means that can be released by fitting a nut into the large diameter portion so that it does not protrude from the large diameter portion, and the male screw end of the bolt that penetrates the ventilation hole from the heat insulating material side is screwed into the nut Can be configured.

Since the lid body is provided with, for example, a ventilation hole, the inflow water will flow through the lid body. Therefore, in the heat insulating material side structure of the back side of the lid body,
It is preferable that a discharge port for discharging the inflow water is formed. However, if the discharge port is formed on the heat insulating material side, the odor will pass through the discharge port and be guided to, for example, the ventilation hole, but in this case, snow does not melt on the lid body and snow is present. If the emission of odors to the atmosphere is blocked, for example, odors may be emitted at once during snow removal work that is often performed in the daytime, which may give discomfort to workers and passers-by. Therefore, the outlet is preferably configured to discharge the inflow water through the trap. The odor is prevented from leaking to, for example, the vent hole side by the inflow water stored in the trap.

A key hole for inserting an opening / closing tool is often formed in the lid body. If the lower side of the key hole is covered with a heat insulating material or a supporting member, the key hole is inserted. The opening / closing tool may hit and the heat insulating material or the supporting member may be damaged. Therefore, it is preferable that a space is formed below the key hole to allow the insertion of the opening / closing tool. However, if this space has a bottom, there is a possibility that earth and sand that has passed through the keyhole will accumulate in the space, making the space shallow, and if the space has a bottom opening, A large amount of odor will be introduced into the keyhole. Therefore, a rubber elastic member is formed on the heat insulating material side so as to open both ends of the key hole, for example, a tubular part for a tool having a diameter into which an opening / closing tool can be inserted, and to block gas from passing through the tubular part for the tool. It is effective that a packing is provided and a cut is radially formed from the center of the rubber elastic packing. Odor is prevented from leaking to the keyhole side by the rubber elastic packing. When earth and sand accumulate on the rubber elastic packing, for example, insert a push rod-shaped tool through the key hole and press the packing so that the packing deforms and opens and the accumulated earth and sand falls into the manhole. . The technology described here is included in the following invention. 1. A lid for an underground structure including a plate-shaped metal lid main body and a heat insulating material attached to the back surface of the lid main body so as to cover the back surface side of the lid main body entirely or almost entirely, for example. In the lid main body, a keyhole is formed, and on the side of the heat insulating material, there are provided tool tubular portions having openings at both ends that are continuous with the keyhole. A lid for an underground structure, which includes a rubber elastic packing that blocks gas from passing through the tool tubular portion, and the rubber elastic packing has a notch radially formed from a center.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a manhole cover to which the present invention is applied, FIG. 2 is a sectional view of the manhole cover attached to a manhole cover receiving frame, and FIG. 3 is an enlarged view of a vent hole portion.
4 is an enlarged view of the discharge port portion, FIG. 5 is a plan view of the heat insulating member, and FIG. 6 is an enlarged view of the keyhole portion.

The manhole cover 1 (cover for underground structure) is
A cast iron lid main body 5 formed in a circular plate shape integrally provided with a frame portion 3 along the outer periphery, and a heat insulating member 7 attached to the back side of the lid main body 5 (heat insulating material side). )
And a rear surface 9 on the inner side of the frame portion 3 of the lid body 5 has an outer peripheral portion 11 that spreads in a narrow width in the radial direction (horizontal direction).
And a central portion 13 that descends conically from the inner circumference of the outer peripheral portion 11 toward the center. The heat insulating member 7 is a stainless steel support member 15 formed in the shape of a thin plate (illustrated as each unit being integrally formed, but separate members may be joined together. ) And the heat insulating material 17 housed in the support member 15.
The support member 15 is formed of a bottom portion 19 and a peripheral wall portion 21 formed on an outer peripheral edge of the bottom portion 19 so as to spread outward and upward, and the bottom portion 19 faces the center. Is formed so as to be gently inclined downward.
The support member 15 houses the heat insulating material 17, and is integrated with the lid body 5 in a state where the upper end 23 of the peripheral wall portion 21 is in contact with the boundary between the back surface 9 of the lid body 5 and the frame portion 3. The manhole cover 1 having such a configuration is releasably fitted into the manhole cover receiving frame 24 to close the opening of the manhole.

A plurality of ventilation holes 25 are formed in the outer peripheral portion of the lid body 5 so as to be arranged side by side in the circumferential direction, and a thin and long key hole 27 is also penetrated in the radial direction at symmetrical positions in the outer peripheral portion. A pair is formed. The vent hole 25 is formed on the surface 29 of the lid body 5.
Is formed by a taper-shaped front surface side portion 31 and a main body portion 33 which is slightly tapered from the lower end of the front surface side portion 31 and opens to the back surface 9.

A circular discharge port 35, which is concentric with the support member 15, is provided at the center of the bottom portion 19 of the support member 15, and a cylindrical portion 3 for water stop projecting downwardly at the periphery of the discharge port 35.
7 is provided. The bottom portion 19 of the support member 15 also has, on the outer side of the water blocking tubular portion 37, concentrically with the water blocking tubular portion 37 and is taller than the water blocking tubular portion 37. The portion 39 is provided so as to project upward, and an annular water storage portion 41 is formed between the water blocking tubular portion 37 and the water storage tubular portion 39, and the water storage tubular portion 39 is formed. An annular accommodating portion 43 is formed between the peripheral wall portion 21 and the peripheral wall portion 21. Support member 15
Further, a blocking tubular portion 45 is formed between the water blocking tubular portion 37 and the water storage tubular portion 39 at the bottom portion 19 of the bottom portion of the bottom portion 19 of the water blocking tubular portion 37. Four running water passage openings 47 are provided at equal intervals in the circumferential direction at a position lower than the upper end of the tubular portion 37 for use, and in the tubular portion 45 for blocking,
A shield plate 49 is provided substantially in the center in the height direction, and a low cylindrical housing portion 51 is formed above the shield plate 49. The upper end of the shut-off tubular portion 45 is the back surface 9 of the lid body 5.
Is in contact with.

A heat insulating material 17 housed in the support member 15.
Is a polyethylene foam annular heat insulating material 53 which is fitted into the annular housing portion 43 and whose upper surface gently descends toward the center, and a polyethylene foam disk-shaped heat insulating material 55 which is fitted into the tubular housing portion 51. And are separately provided, and a relatively large gap 57 is formed between the annular heat insulating material 53 and the back surface 9 of the lid body 5. Ring insulation 53
In the gap 57 between the cover 9 and the back surface 9 of the lid body 5, twelve elongated spacers 59 of the same material (polyethylene foam) as the heat insulating material 17 are radially arranged at equal intervals in the circumferential direction, and between the adjacent spacers 59. A running water channel 61 is formed. Since the spacer 59 is interposed between the back surface 9 of the lid body 5 and the upper surface of the annular heat insulating material 53, when the manhole lid 1 is opened and placed on the ground, the bottom portion 19 of the support member 15 is deformed. There is no such thing. The annular heat insulating material 53, the disk-shaped heat insulating material 55, and the spacer 59 are provided with a heat-resistant coating 63. For example, when tobacco enters the heat insulating member 7 through the ventilation hole 25, the heat of the heat insulating material 1 is increased by the cigarette fire.
7 and the spacer 59 are prevented from being ignited or damaged. The heat-resistant coating 63 is an annular heat insulating material 5.
3, the disk-shaped heat insulating material 55 and the spacer 59 are entirely wrapped, but for example, the heat insulating material 17 (annular heat insulating material 53
The disk-shaped heat insulating material 55) may be provided only on the upper surface.
In addition, reference numeral 65 in FIG. 2 denotes a rubber annular seal member arranged between the peripheral wall portion 21 of the support member 15 and the outer peripheral surface of the annular heat insulating material 53.

For example, the annular heat insulating material 5 is passed through the ventilation holes 25.
The inflow water that has dropped onto 3 passes through the running water channel 61 and flows into the outer peripheral side of the water storage portion 41 (outside of the blocking tubular portion 45). Then, the inner peripheral side of the water storage portion 41 (the shut-off tubular portion 45
As the (inner) inflow water flows over the upper end of the water blocking tubular portion 37 and flows down into the manhole from the outlet port 35, it passes through the running water passage port 47 of the shutoff tubular portion 45 and the water storage portion 41. Of the water blocking tubular portion 37, and flows down into the manhole through the discharge port 35 (see the arrow in FIG. 4). Therefore, the trap formed by the water storage portion 41 between the water blocking tubular portion 37 and the water storage tubular portion 39 and the shutoff tubular portion 45 always has snow melting water or the like during the snow season. The inflow water from the ventilation holes 25 is stored, and the odor from the manhole is prevented from entering between the heat insulating member 7 and the lid body 5 by the inflow water stored in the water storage portion 41. As the trap, various structures can be adopted as long as they can discharge the inflow water and can temporarily store the inflow water in order to block odors. You may use the thing provided with the structure which can be easily removed by cleaning.

On the outer peripheral portion of the bottom portion 19 of the support member 15, a fixing tubular portion 67 extending upward to the same height as the peripheral wall portion 21.
Are provided through the ring-shaped heat insulating material 53 (through holes provided in the ring-shaped heat insulating material 53) and corresponding to some (specifically, four) ventilation holes 25. The portion 67 is formed in an elliptical cross-section with both upper and lower ends open, and an annular inwardly projecting portion 69 is formed in the fixing tubular portion 67. A bolt 71 is passed through each ventilation hole 25 provided with a corresponding fixing tubular portion 67.
The male screw portion at the tip of No. 1 enters the fixing tubular portion 67, passes through the inward projecting portion 69, and is fitted into the fixing tubular portion 67 below the inward projecting portion 69 in a non-rotating state. Nuts 7
It is screwed into 3. Therefore, since the head portion 75 of the bolt 71 and the nut 73 sandwich the inner peripheral surface of the front surface side portion 31 of the vent hole 25 and the inwardly projecting portion 69, the heat insulating member 7 serves as the peripheral wall of the support member 15. The upper end of the portion 21, the upper end of the fixing tubular portion 67, and the upper end of the blocking tubular portion 45 are located at the lid body 5.
It is fixedly attached to the lid main body 5 while being in contact with the back surface 9 of the. In the bolt 71, the outer peripheral surface of the head portion 75 is entirely in contact with the inner peripheral surface of the surface side portion 31 of the ventilation hole 25, and the upper surface of the head portion 75 is substantially aligned with the upper end position of the surface side portion 31 of the ventilation hole 25. Further, the tip of the shaft portion 77 is formed so as to extend slightly above the lower surface opening of the fixing tubular portion 67. In order to fix the heat insulating member 7 to the lid body 5 by screwing the bolt 71 into the nut 73, the nut 73 may be prevented from coming out of the fixing tubular portion 67, and the bolt 71 may be rotated in the tightening direction. . Since the nut 73 is in the rotation stop state when it is arranged in the fixing tubular portion 67, when the bolt 71 is rotated in the tightening direction, the tip male screw portion of the bolt 71 is screwed into the nut 73. . On the contrary, in order to remove the nut 73 from the bolt 71 and remove the heat insulating member 7 from the lid body 5, the bolt 71 may be rotated in the loosening direction. Here, for example, when the surface side portion of the ventilation hole 25 has a hexagonal shape and the nut 73 can be fitted in the rotation stopping state, the head portion of the bolt can be rotated in the fixing tubular portion 67. Due to the circular configuration, the nut 7 is provided on the surface side of the vent hole 25.
3 can be inserted, and the bolt can be inserted into the vent hole 25 from the lower surface opening of the fixing tubular portion 67 to screw the male screw end of the bolt into the nut 73.

As shown in FIG. 6, the bottom portion 1 of the support member 15 is
On the outer peripheral portion of 9, the opening / closing tool tubular portion 79 that extends upward to the same height as the peripheral wall portion 21 penetrates the annular heat insulating material 53 (penetrates the hole provided in the annular heat insulating material 53), and the key. The opening / closing tool tubular portion 79 is provided so as to correspond to the hole 27 and has a diameter substantially the same as the length of the key hole 27, with the upper and lower ends open.
A narrow annular inward projection 81 is formed inside. A thin disk-shaped rubber elastic packing 85 having an annular leg portion 83 on the outer periphery is placed on the annular inward projection 81, and the rubber elastic packing 85 has a cross shape intersecting at the center. A cut 87 is formed. The outer end of the cross-shaped notch 87 is almost up to the annular leg portion 83,
That is, it extends almost to the inner peripheral edge position of the inward protruding portion 81. The rubber elastic packing 85 is attached to the inward projection 81,
For example, it can be fixed with an adhesive.

To open the manhole cover 1, the tip hooks 91, 91 of the opening / closing tool 89 are attached to the back surface 9 of the cover body 5.
The tip of the opening / closing tool 89 is inserted through the key hole 27 until it is located below the outer peripheral portion 11. The tip of the opening / closing tool 89 enters into the opening / closing tool tubular portion 79. Then, the opening / closing tool 89 is rotated, and the tip hook portions 91, 91 are hooked around the key hole 27 on the back surface 9 of the lid body 5 to lift the manhole lid 1.

FIG. 7 is a view showing a case where the rubber elastic packing 85 is opened.

If earth and sand fall from the keyhole 27 and accumulate on the rubber elastic packing 85, the large driver 9
3 and the like are inserted into the keyhole 27, the central portion of the rubber elastic packing 85 is pushed and opened, and the deposited earth and sand is dropped into the manhole.

[0024]

As described above, according to the present invention,
It is possible to provide a lid for an underground structure having a structure in which a heat insulating material can be easily attached to and removed from the lid body.

[Brief description of drawings]

FIG. 1 is a plan view of a manhole cover to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a state in which a manhole cover is attached to a manhole cover receiving frame.

FIG. 3 is an enlarged view of a vent hole portion.

FIG. 4 is an enlarged view of a discharge port portion.

FIG. 5 is a plan view of a heat insulating member.

FIG. 6 is an enlarged view of a keyhole portion.

FIG. 7 is a view showing a case where a rubber elastic packing is opened.

[Explanation of symbols]

1 Manhole cover (cover for underground structure) 5 Lid body 7 Insulation member 9 back side 17 Insulation 25 vents 27 keyhole 35 outlet 71 bolts (releasable means) 73 Nut (Releasable means) 79 Opening and closing tool tubular part (tool tubular part) 85 Rubber elastic packing 87 notches

Claims (5)

[Claims] 1. A lid for an underground structure, comprising a plate-shaped metal lid body and a heat insulating material attached to the back surface of the lid body, wherein the heat insulating material uses a releasable means. A lid for an underground structure, which is detachably attached to the lid body. 2. A vent hole is formed in the lid body, and the releasable means is inserted into the nut provided on the heat insulating material side and the vent hole of the lid body, and The lid for an underground structure according to claim 1, further comprising a screwed bolt. 3. A vent hole is formed in the lid body, and the releasable means is inserted into the vent hole of the lid body from a nut provided on the lid body and from the heat insulating material side. The cap for the underground structure according to claim 1, further comprising: a bolt screwed into the nut. 4. A discharge port is formed on the heat insulating material side for discharging inflow water that has flowed in through the lid body, and the discharge port is provided with the inflow water through a trap. The underground structure lid according to claim 1, 2 or 3, wherein 5. A key hole is formed in the lid main body, and a tool tubular portion having both end openings connected to the key hole is provided on the heat insulating material side, and the tool tubular portion comprises: A rubber elastic packing for blocking the passage of gas through the tubular portion for tools is provided, and the rubber elastic packing has a notch formed radially from the center. The lid for an underground structure according to 1, 2, 3 or 4.