JP3142869U - Manhole structure - Google Patents

Abstract

A manhole structure including a manhole cover that does not obstruct traffic, is easy to remove, and does not impair security performance.
A frame body 9 disposed in an opening portion 8 of a manhole 7, a closed portion which is supported by the frame body 9 and closes a part of the opening portion 8, and an underground tank disposed in the manhole 7. An outer lid member 10 having an oil supply opening for connection to the oil supply port 5, a recess formed in a concave shape toward the inside of the manhole 7, and a size that can be installed and gripped in the recess. An inner lid member 11 having a handle portion 20 that closes the oil supply opening, and a member that is fitted in the recess and covers the handle portion 20 in an invisible manner, and a magnetized portion that magnetizes a predetermined magnetic body And having a security lid member 12 that is flush with the surface of the inner lid member 11 when fitted.
[Selection] Figure 1

Description

  The present invention relates to a manhole structure, and more particularly to a manhole structure including a manhole cover for closing a manhole provided for refueling an underground tank or the like.

  Conventionally, liquids such as gasoline, kerosene, light oil, and heavy oil are stored in tanks called underground tanks installed in underground culverts. On the underground tank, there is a manhole that connects the ground and the inside of the culvert. Through this manhole, refueling and maintenance can be performed. And the manhole cover is installed in the upper end part (namely, part opened on the ground) of the manhole, and when the need for refueling etc. is unnecessary, the inside of a manhole can be obstruct | occluded.

  The manhole cover of the underground tank is a frame that is fixed to the upper end of the manhole, an outer cover member that is fitted into the frame and has a small-diameter opening, and is fitted into the opening of the outer cover member. Generally, it is composed of three parts including a lid member. At the time of refueling, only the inner lid member having a relatively small diameter is lifted and removed. When maintenance such as cleaning is necessary, the inner lid member is first removed, and the outer lid member is lifted and removed by placing a hand on the edge portion of the opened opening. As described above, the lid member has a double structure of the outer lid member and the inner lid member, which requires only a relatively small opening for inserting a hose or the like when refueling. The reason for opening and closing is that handling is inconvenient and roundabout. Therefore, the entire lid member can be removed only when necessary for maintenance or the like.

  Here, the conventional method for removing the inner lid member will be described more specifically. The conventional inner lid member is provided with a small protrusion and a small-diameter hole. The operator inserts and locks a dedicated tool into the protrusions and holes to lift the inner lid member. Various types of tools have been proposed depending on the shape of the locking portion and the weight of the inner lid member. In the above, in order to simplify the description, the shape of the opening of the outer lid member and the shape of the inner lid member are referred to as “small diameter”, but the shape is not limited to a circular shape. There are various things, such as rectangular and nearly square.

  The above prior art is naturally performed by those skilled in the art, and the applicant has no knowledge of documents describing the prior art.

  By the way, in order to make the refueling operation more convenient, there has been a demand for a simpler method of removing the inner lid member. For example, if a large handle that can be grasped manually is attached to the inner lid member, the inner lid member can be removed without using a dedicated tool. However, attaching a large handle that can be grabbed by hand has the problem of hindering traffic on the lid. Furthermore, since it can be grasped without a dedicated tool, the inner lid member is easily removed by a malicious third party. Therefore, attaching the handle has a problem from the viewpoint of crime prevention.

  In view of the above-described problems, the present invention has an object to provide a manhole structure including a manhole cover that does not obstruct traffic, is easy to remove, and does not impair security performance.

  The manhole structure according to the present invention includes: a frame disposed in an opening of a manhole, a closing portion that is supported by the frame and closes a part of the opening, and is disposed in the manhole. An outer lid member having an oil supply opening for connecting an oil supply hole or the like to the oil supply port of the storage tank, a recess formed in a concave shape toward the inside of the manhole, and a grip provided in the recess An intermediate lid member that has a handle portion formed in a large size and closes the oil supply opening, and a member that is fitted in the recess and covers the handle portion in an invisible manner, and magnetizes the magnet And a security cover member having the same height as the surface of the inner cover member when fitted.

  Here, `` provided in the recess '' for the handle portion is not only a method of installing a handle portion separately created using a predetermined fixing fitting such as a screw or an adhesive in the recess, A method of integrally forming the concave portion and the handle portion with the same material can be exemplified.

  In the manhole structure of the present invention, a handle portion is provided on the inner lid member. Therefore, since the inner lid member can be removed without using a dedicated tool, the removal work is simplified. Moreover, since the manhole structure of this invention has a crime prevention cover member, it can cover a handle part invisible. Thereby, a handle part can be concealed from the eyes of a third party, and mischief can be prevented. Further, the security cover member is configured to have the same height as the surface of the middle cover member when fitted. In other words, since no recessed portion remains on the surface of the manhole cover, the passage on the manhole cover is made safe.

  On the other hand, since the crime prevention lid member of the present invention is provided with a magnetized portion, it is possible to magnetize the magnet. Therefore, the security lid member can be removed from the inner lid member by lifting upward together with the magnets magnetized in the magnetized portion without providing a projection or hole for inserting a dedicated tool.

  By the way, it is necessary to pay attention to the weight when holding the handle and lifting the inner lid member. If it is too heavy, it will be difficult to lift it by hand. Therefore, there has been a demand to reduce the weight of the inner lid member (or the entire manhole cover) as much as possible within the range of clearing the load bearing performance.

  However, even if the load bearing performance is cleared, there is another problem in weight reduction. That is, it is waterproof. The inner lid member (or the entire manhole cover) prevents the intrusion of rainwater or the like by crushing packing or the like provided at the peripheral edge by its own weight. Therefore, when the inner lid member is reduced in weight, the waterproof performance is deteriorated, and there is a problem that water is allowed to enter the manhole.

  Therefore, a method of providing a bottomed cylindrical protector at the oil filling port of the underground tank and placing an umbrella-shaped lid on the protector is conceivable. A drainage groove is provided between the protector and the inner wall of the manhole, and the water that has entered the manhole is drained from the drainage groove. By doing so, water can be prevented from entering the protector, and the tank filler and the oil pipe can be waterproofed so as not to rust.

  However, this method also has a further problem of waterproofing. This is the case when a large amount of water flows in like a heavy rain or flood. If the amount of water that flows in exceeds the drainage capacity of the drainage channel, it will flow backward through the drainage channel and flood the manhole. Then, there was a problem that the protector lid that was just placed was lifted by buoyancy, allowing water to enter the protector.

  Therefore, in the manhole structure of the present invention, “a bottomed cylindrical protector disposed so as to surround the oil filler opening of the storage tank, and a protector lid that can be fixed to the upper portion of the protector and that closes the protector. And “having further included”.

  Here, “fixable” means that the protector lid can be fixed to the protector in a detachable manner using a predetermined fixing bracket such as a screw, or either one of the protector lid and the protector lid ( Alternatively, a hook-like locking means may be provided to fix the protector lid to the protector in a detachable state. In short, any protector lid may be used as long as it can be fixed so as not to be lifted by buoyancy.

  Accordingly, the manhole structure of the present invention includes a protector lid that can be fixed to the upper portion of the protector. Therefore, even in the case of heavy rain or flood, the protector lid can be fixed so as not to float up, so that the water filler can be waterproofed by preventing water from entering the protector. This makes it possible to reduce the weight of the inner lid member as much as possible within the range where the load bearing performance is cleared.

  Further, in the manhole structure of the present invention, “the crime prevention lid member has a covering portion that covers the upper portion of the handle portion, and an extending portion that extends substantially perpendicularly from the covering portion and fits into the concave portion”. Can be.

  In the manhole structure of the present invention, the extension portion is provided in the security cover member. Therefore, when the security cover member is fitted into the recess of the middle cover member, the extending portion is disposed in the recess, so that it is possible to prevent dust, water, pebbles, etc. from entering the recess from the gap and accumulating.

  Furthermore, it has succeeded in improving the crime prevention performance of a crime prevention cover member more by the extension part. In other words, since the extending portion extends substantially vertically from the covering portion that covers the upper portion of the handle portion, when the security cover member is removed from the recessed portion, it cannot be lifted in a direction other than the substantially vertical direction. Yes. This is because if the extension portion is to be pulled up in a direction other than the vertical direction, that is, in an oblique direction, the extended portion interferes with the inner wall of the concave portion, and cannot be pulled out from the concave portion. Therefore, even if a malicious third party tries to remove the security cover member by means other than putting a bar or the like and magnetizing it, it cannot be easily pulled out from the recess. Therefore, the crime prevention performance is increased by the extended portion. In addition, since the extension portion is provided, it is impossible to pull up in a direction other than the substantially vertical direction. Therefore, even when a bicycle or the like passes on the manhole cover, the security cover member is not easily turned up. Thereby, safety is also improved.

  As described above, according to the manhole structure of the present invention, since the handle portion is provided, the inner lid member can be opened without using a large dedicated tool. Thereby, a manhole structure that can be easily handled can be provided. Moreover, since it has a crime prevention cover member, it is possible to cover a handle part invisible. Thereby, a manhole structure with high crime prevention performance can be provided. Further, since the security cover member is fitted into the manhole cover so that no recessed portion remains on the surface of the manhole cover, the passage on the manhole cover is further secured.

  Hereinafter, a manhole structure according to an embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view schematically showing a manhole structure, FIG. 2 is a plan view of a manhole cover in the manhole structure, FIG. 3 is an exploded perspective view of the manhole cover, and FIG. 4 is a method for using the manhole structure. FIG. 5 is an explanatory diagram showing a part of the BB cross section of FIG. 1.

  As shown in FIG. 1, the manhole structure 1 of the present invention includes a manhole cover 2, a protector 3, and a protector cover 4. The manhole cover 2 closes the opening 8 of the manhole 7 provided on the fuel filler port 6 of the underground tank 5. Here, the “underground tank 5” corresponds to the “storage tank” of the present invention. In addition, about the cross section of the manhole cover 2, the AA cross-section part of FIG. 2 is extracted and shown.

  As shown in more detail in FIGS. 2 and 3, the manhole cover 2 includes a frame body 9, an outer cover member 10, an inner cover member 11, and a security cover member 12. These members constituting the manhole cover 2 are mainly composed of ductile cast iron (so-called FCD) which is a kind of cast iron in this example, but other ordinary cast iron (so-called FC), iron, wood, The material is not particularly limited as long as it can clear predetermined load-bearing performance such as concrete and synthetic resin.

  The frame body 9 supports an outer lid member 10 described later, and is disposed in an opening 8 (see FIG. 1; the same applies hereinafter) of a manhole 7 (see FIG. 1; the same applies hereinafter). The configuration includes a first flange portion 9a that is fixed to the ground surface 13 (see FIG. 1, the same applies hereinafter), and a second flange portion 9b that places the outer lid member 10 on the upper surface thereof. In the one flange portion 9a, eight through holes 14 for penetrating an unillustrated locking member are formed. A predetermined locking member (not shown) such as a bolt or a screw is passed through the through hole 14, and the entire frame 9 can be fixed to the ground 13.

  The outer lid member 10 is a member that is supported by the frame body 9 and closes a part of the opening 8, and has a closing part 15 that constitutes a closing part and an oil supply opening 16. The closed portion 15 has a substantially circular shape with an outer diameter of about 800 mm, and has a non-slip portion 17 having an uneven cross-sectional shape in which a plurality of concave portions and convex portions are arranged in a lattice shape, and an underground tank 5 ( A character marking portion 18 is formed on which characters indicating brands and the like of FIG. The weight of the outer lid member 10 is about 33 kg. The oil supply opening 16 is an opening for inserting and connecting an oil supply hole or the like to an oil supply port 6 (see FIG. 1; the same applies hereinafter) disposed in the manhole 7, and has a diameter near the center of the outer lid member 10. It is provided in a circular shape of about 450 mm.

  The inner lid member 11 is a member that closes the oil supply opening 16 and has a recess 19 and a hand 20 provided in the recess 19. The outer shape of the inner lid member 11 is formed in a circular shape having a diameter of about 450 mm so as to match the oil supply opening 16. A non-slip portion 21 having the same configuration as the anti-slip portion 17 of the outer lid member 10 is formed on the surface, and four grooves 22 are provided for improving drainage. The weight of the inner lid member 11 is about 21 kg. More specifically, as shown in FIG. 5A, the concave portion 19 is formed in a concave shape from the surface side of the inner lid member 11 into the manhole 7, and its outer shape has an effective diameter K of about 112 mm. The depth and the depth D are about 37 mm. Therefore, it can be smoothly inserted by an adult hand having a general size. A handle portion 20 is installed in the recess 19. The handle portion 20 is formed integrally with the inner lid member 11, has a height that does not protrude from the surface of the inner lid member 11, and a height obtained by subtracting a thickness T corresponding to a covering portion 23 of the security lid member 12 described later. Is arranged. By arranging in this way, when the security lid member 12 is fitted, the surface height of the middle lid member 11 and the security lid member 12 can be the same. FIG. 5A shows the BB cross section of FIG. 2, but a part thereof is omitted for the sake of simplicity.

  As shown in FIG. 5A, the crime prevention lid member 12 is a member that is fitted into the recess 19 and covers the handle portion 20 in an invisible manner. The cover portion 23 covers the upper portion of the handle portion, and the cover portion 23 is substantially omitted. An extending portion 24 that extends vertically and is fitted into the recess 19 is provided. In this example, since the entire crime prevention lid member 12 including the covering portion 23 is formed of ductile cast iron, the covering portion 23 also functions as a magnetized portion that magnetizes the magnet. The weight of the security cover member 12 is about 2.5 kg. The covering portion 23 is formed so as to substantially coincide with the opening portion of the concave portion 19 and has a substantially disk shape with a diameter of about 125 mm. Its thickness T is about 7 mm. The extending portion 24 is a member extending substantially perpendicularly from the covering portion 23 and is fitted to fill the recess 19. Further, a notch 25 is provided so as not to interfere with the handle 20 of the inner lid member 11 when fitted.

  The configuration of the magnetized portion is not limited to the above configuration. For example, a method may be used in which the entire crime prevention lid member 12 is made of a known synthetic resin, and a predetermined magnetic material is adhered (or embedded) in a part of the crime prevention lid member 12. Then, it is also possible to create a lighter security cover member 12. However, if the entire security lid member 12 is made of ductile cast iron as described above, it can be formed of the same material as the inner lid member 11 and the like, so that the production process can be simplified and the configuration of the security lid member 12 itself can be simplified. There are advantages.

  The manhole structure 1 of the present invention further includes a protector 3 and a protector lid 4 as shown in FIG. The protector 3 is a bottomed cylindrical member disposed so as to surround the oil supply port 6 of the underground tank 5 and has a function of temporarily storing oil that has been accidentally leaked from the oil supply port 6 or the like. A predetermined gap 28 is formed between the protector 3 and the inner wall of the manhole 7. Rainwater or the like that has entered the manhole 7 is collected in the gap 28 along the protector lid 4 to be described later, and drained into the ground.

  A protector lid 4 made of fiber reinforced plastic (so-called FRP) is installed in the upper opening of the protector 3. The protector lid 4 is a so-called umbrella shape that is formed so as to be lower toward the outer periphery as a whole, an annular plate-shaped outer lid 4 a that abuts on the upper opening of the protector 3, and an inner lid that closes the inner peripheral edge of the outer lid 4 a 4b. The outer lid 4a is locked to the protector 3 by a locking member 26 in a detachable state. Since the known butterfly bolt is used as the locking member 26 in this example, it can be attached and detached by hand without using a special tool. The inner lid 4b is detachably locked to the outer lid 4a by a locking member 27. The structure of the locking member 27 is the same as that of the locking member 26 in this example.

  In this example, the protector lid 4 is fixed to the protector 3 by the “locking member 26”, but the present invention is not limited to this configuration. For example, a locking portion and a locked portion corresponding to the protector 3 and the protector lid 4 may be provided and fixed by matching them. In short, the configuration is not limited to the above as long as the protector lid 4 can be fixed so as not to be lifted by buoyancy.

  Next, a method of using the manhole structure 1 of this example will be described based on FIGS. 1 and 4. As shown in FIG. 1, the manhole structure 1 of this example is installed in an underground tank 5 for storing a liquid such as gasoline. The manhole cover 2 used in the manhole structure 1 of this example can remove the inner lid member 11 by grasping and lifting the handle portion 20. However, during normal times when no refueling operation or the like is performed, for example, as illustrated in FIG. 2, the handle portion 20 is covered with the covering portion 23 of the security cover member 12 in an invisible state. Therefore, it is considered that a third party who does not know the structure of the manhole cover 2 does not know how to open it easily. When supplying gasoline or the like, as shown in FIG. 4A, first, a commercially available magnet 29 with a handle is magnetized on the covering portion 23 of the security cover member 12. Since the covering portion 23 is made of ductile cast iron, it also functions as a magnetized portion. The type of the magnet 29 is not particularly limited, and examples thereof include neogeo magnets and ferrite magnets, but those having a magnetic force that can be lifted while the crime prevention lid member 12 is magnetized at least about 2.5 kg are preferable. Here, the “magnet 29” corresponds to the “magnet” of the present invention.

  Next, the handle portion of the magnet 29 is gripped and lifted in a substantially vertical direction. Then, as shown in FIG. 4B, the security cover member 12 magnetized on the magnet 29 is lifted upward together with the magnet 29. Thereby, the handle part 20 covered with the covering part 23 is exposed and becomes visible. Here, since the inner diameter size of the concave portion 19 of the inner lid member 11 and the outer size of the covering portion 23 of the crime prevention lid member 12 are formed to substantially coincide with each other, it is easy to use other than the method using the magnet 29. The security cover member 12 cannot be removed. For example, even if a commercially available bar or driver is inserted into the gap between the inner lid member 11 and the security lid member 12 and forcibly opened, it is extremely difficult because there is almost no gap.

  Further, even if the bar or the like can be forcibly inserted, it is difficult to remove the security cover member 12 by itself. This is because the crime prevention lid member 12 of the present example has the extending portion 24 that extends substantially vertically from the covering portion 23. When a bar or the like is inserted and the covering portion 23 is to be opened, the extending portion 24 interferes with the inner wall of the concave portion 19. Therefore, it is difficult to remove the security cover member 12 from the inside of the recess 19. As described above, even if a malicious third party can predict the structure of the manhole cover 2, it is difficult to remove the security cover member 12 except by a formal procedure.

  Next, the exposed handle portion 20 is gripped and the inner lid member 11 is lifted upward. Then, as shown in FIG.4 (c), the oil supply opening part 16 of the outer cover member 10 opens. Thereby, the inner lid 4b of the protector lid 4 attached to the protector 3 (see FIG. 1; the same applies hereinafter) is exposed. When it is desired to supply oil into the underground tank 5 (see FIG. 1, the same applies hereinafter), the locking member 27 is loosened and the inner lid 4b is removed from the outer lid 4a. Then, a hose is inserted into the fuel filler opening 6 (see FIG. 1; the same applies hereinafter) opened by removing the inner lid 4b, and gasoline or the like is replenished in the underground tank 5.

  Gasoline or the like that has been accidentally leaked during such a refueling operation is temporarily stored in the protector 3 (see FIG. 1; the same applies hereinafter). When it is desired to clean and remove the stored gasoline or the like, as shown in FIGS. 1 and 4D, it is possible to lift the outer lid member 10 by placing a hand on the oil supply opening 16. More specifically, the outer lid member 10 is removed, the locking member 26 is loosened, and the opening 8 is opened. By doing so, the inside of the protector 3 can be easily wiped manually.

  In this example, the outer lid 4a can be easily detached from the protector 3 simply by releasing the screwed state of the locking member 26 during cleaning. At the same time, the outer lid 4a can be locked to the protector 3 in a state where it is not necessary to open it. For example, even when a large amount of rainwater is submerged in the manhole 7 due to heavy rain, the outer lid 4a does not float and fall off, and the waterproof state in the protector 3 can be maintained. Therefore, it has succeeded in improving the ease of maintenance, maintaining high waterproof performance.

  Thus, according to the manhole structure 1 of the present invention, since the handle portion 20 is provided on the inner lid member 11, the inner lid member 11 can be lifted and opened manually. Thereby, since the inner lid member 11 can be opened without using a large dedicated tool, the manhole structure 1 that can be easily handled can be provided. Moreover, since the crime prevention lid member 12 is provided, the handle portion 20 of the inner lid member 11 can be made invisible. As a result, a third party who does not know the structure of the manhole cover 2 does not know how to open it easily, so the crime prevention performance can be improved.

  Furthermore, according to the manhole structure 1 of the present invention, the handle portion 20 is provided in the concave portion 19, and the security lid member 12 is configured to have the same height as the surface of the inner lid member 11 when fitted. Yes. That is, since it is comprised so that the hollow part may not remain on the surface of the manhole cover 2, there is no possibility that a bicycle tire and a pedestrian's leg may get caught, and the passage on the manhole cover 2 is made safe. Moreover, since the crime prevention lid member 12 is made of ductile cast iron as a main material, it is magnetized as a whole without adding a special magnetic material, and also functions as a magnetized portion. Thereby, it is possible to provide a simple manhole cover 2 that is not only durable.

  Furthermore, according to the manhole structure 1 of the present invention, the protector lid 4 is locked to the protector 3 by the locking member 26. Therefore, even during heavy rain or flood, the oil filler opening 6 can be waterproofed by preventing water from entering the protector 3, so that the inner lid member 11 can be reduced in weight as much as possible within the range where the load bearing performance is cleared.

  Moreover, according to the manhole structure 1 of the present invention, the outer lid member 10 and the inner lid member 11 can be reduced in weight because the protector 3 ensures waterproofness. Thereby, even if the diameter of the inner lid member 11 is increased, the inner lid member 11 can be sufficiently within a range that can be handled manually. Therefore, it is possible to provide the manhole cover 2 and the manhole structure 1 that have a larger diameter than the conventional lid member 11 and have a wide frontage and easy maintenance when removed.

  Further, according to the manhole structure 1 of the present invention, the extended portion 24 integrally formed with the security cover member 12 is provided, and the volume of the extended portion 24 occupies most of the space volume of the recessed portion 19. Yes. If it is assumed that the crime prevention lid member 12 is not provided, stones, gravel, rainwater, etc. 30 may be accumulated in the recess 19 as shown in FIG. If it does so, since these stones, gravel, rainwater, etc. 30 will become obstructive when holding the handle part 20, the effort which eliminates them will arise. On the other hand, in the present invention, as shown in FIG. 5A, since the extended portion 24 is fitted in the recess 19, the space in the recess 19 becomes extremely small, and stones, gravel, rainwater, etc. 30 are not easily collected. Become. This contributes to the provision of the manhole structure 1 with better maintainability.

  Furthermore, according to the manhole structure 1 of the present invention, since the extending portion 24 is provided, it is easy to remove the security cover member 12 by means other than putting a bar or the like and magnetizing it. Is configured so that it cannot be pulled out of the recess 19. Therefore, the manhole structure 1 with higher crime prevention performance is provided. Furthermore, since the extended portion 24 is provided, it cannot be lifted in a direction other than substantially vertical. Therefore, even when a bicycle or the like passes over the manhole cover 2, it is difficult to turn up and safety performance is also improved. ing.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements can be made without departing from the spirit of the present invention, as described below. And design changes are possible.

  That is, in the manhole structure 1 of this example, the protector lid 4 locked to the protector 3 by the locking member 26 is illustrated, but the present invention is not limited to this configuration. The protector 3 that does not have the locking member 26 and the manhole structure 1 that includes the protector lid 4 and the manhole cover 2 may be used, or the manhole structure 1 that does not include the protector 3 and the protector lid 4 may be used.

  Moreover, in the manhole structure 1 of this example, although the manhole cover 2 which comprises the outer cover member 10 and the inner cover member 11 was illustrated, the crime prevention cover member 12 is installed also in the manhole cover which united these. Is possible. That is, it is also possible to provide a recess corresponding to the recess 19 in a part of a manhole cover such as electricity, gas, water, fire hydrant, sewer, etc. and to provide a structure corresponding to the handle portion 20 and the security cover member 12. . Naturally, since these manhole covers have respective standards, whether or not a configuration corresponding to the handle portion 20 and the security cover member 12 is allowed depends on the standards, but is technically possible. is there.

It is sectional drawing which showed typically the manhole structure of this invention. It is a top view of a manhole cover. It is a disassembled perspective view of a manhole cover. It is explanatory drawing which shows the usage method of a manhole structure. (A) is explanatory drawing which shows a part of BB cross section of FIG. 1, (b) is explanatory drawing explaining the other form of a crime prevention cover member.

Explanation of symbols

1 Manhole structure 2 Manhole cover 3 Protector 4 Protector cover 5 Underground tank (storage tank)
6 Refueling port 7 Manhole 8 Opening portion 9 Frame body 10 Outer lid member 11 Middle lid member 12 Security cover member 15 Closure portion 16 Refueling opening portion 19 Recess 20 Handle portion 23 Covering portion (magnetization portion)
24 Extension part 26 Locking member 29 Magnet (predetermined magnetic body)

Claims (3)

A frame disposed in the opening of the manhole;
An outer lid having a closing portion that is supported by the frame and closes a part of the opening, and an oil supply opening for connecting an oil supply hole or the like to an oil supply port of a storage tank disposed in the manhole. Members,
An inner lid member that has a concave portion formed in a concave shape toward the manhole, and a handle portion that is provided in the concave portion and is formed in a grippable size, and closes the oil supply opening portion;
A member that is fitted in the concave portion and covers the handle portion in an invisible manner, has a magnetized portion that magnetizes the magnet, and has a security lid member that is flush with the surface of the inner lid member when fitted. A manhole structure characterized by comprising: A bottomed cylindrical protector disposed around the oil filler port of the storage tank;
The manhole structure according to claim 1, further comprising a protector lid that can be fixed to an upper portion of the protector and that closes the protector.   The said security cover member has the coating | coated part which covers the upper part of the said handle part, and the extended part extended substantially perpendicularly from this coating | coated part and inserted in the said recessed part, The Claim 1 or Claim characterized by the above-mentioned. 2. A manhole structure according to 2.

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