JP6796414B2 - Manhole opening frame, manhole structure, and manhole opening structure - Google Patents

Description

The present invention relates to a manhole opening frame that forms a manhole opening and a manhole structure provided with such a manhole opening frame. The present invention also relates to a manhole opening structure including a manhole opening frame and a manhole cover.

Manholes will be provided for inspection and maintenance of underground water pipe equipment, sewage pipe equipment, rainwater pipe equipment or telecommunications equipment. The manhole has an opening on the ground surface. People can enter and leave the manhole through this opening. Alternatively, work (eg, inspection and maintenance) can be performed on the equipment in the manhole through this opening. The manhole opening is formed by a manhole opening frame. Normally, the manhole opening is closed by attaching the manhole cover to the manhole opening frame.
Such a manhole opening frame and a manhole cover are described in, for example, Patent Document 1 below.

Japanese Unexamined Patent Publication No. 2006-20259

By the way, a manhole may be provided in a densely planted area of shrubs. The manhole is provided in such an area in order to hide the manhole with a shrub in consideration of design. For example, when a manhole is provided near the entrance of an apartment, the manhole may be hidden by a shrub as described above.

When the manhole is provided in the densely planted area of the shrub in this way, the removed manhole cover cannot be placed on the shrub when inspecting or maintaining the equipment in the manhole. Therefore, there is no place to put the manhole cover nearby. Also, even in other cases, it may be difficult to place the manhole cover.

Therefore, an object of the present invention is to provide a manhole opening frame, a manhole structure, and a manhole opening structure that can eliminate the need to secure a place for a manhole cover.

The manhole opening frame according to the present invention forms a manhole opening, and is configured as follows. The manhole opening frame can be attached with the manhole cover laid down so as to close the opening of the manhole. The manhole opening frame has a hole forming portion that forms an insertion hole into which a manhole cover in an upright position can be inserted. The hole forming portion supports the manhole cover inserted into the insertion hole and keeps it upright.
The manhole structure according to the present invention has a manhole opening frame for forming a manhole opening and a lid support structure. The manhole opening frame can be attached with the manhole cover laid down so as to close the opening of the manhole. The lid support structure has a hole forming portion that forms an insertion hole into which an upright manhole cover can be inserted. The hole forming portion supports the manhole cover inserted into the insertion hole and keeps it upright. The lid support structure is located laterally outside the manhole opening when the manhole opening frame is used.
The manhole opening structure according to the present invention includes the above-mentioned manhole opening frame and manhole cover.

According to the present invention, the manhole opening frame has a hole forming portion that forms an insertion hole that can be inserted with the manhole cover upright. The hole forming portion keeps the manhole cover inserted in the insertion hole upright by supporting it.
Therefore, the hole forming portion serves as a place for placing the manhole cover. Further, since the hole forming portion keeps the manhole cover upright, the amount of the manhole cover protruding from the manhole opening frame to the outside in the horizontal direction can be suppressed.
Therefore, it is not necessary to secure a place for the manhole cover other than the manhole opening frame.

The opening structure of the manhole according to the 1st Embodiment of this invention is shown. The manhole opening frame with the manhole cover removed is shown. The manhole opening frame supported by raising the manhole cover is shown. It is a top view which shows the positional relationship between the center of a manhole opening and a hole forming part. The opening structure of the manhole according to the 2nd Embodiment of this invention is shown. The manhole structure according to the embodiment of the present invention is shown. An example 1 of changing the manhole opening frame is shown. An example 2 of changing the manhole opening frame is shown. An example is shown when the opening of the manhole is polygonal. Another example is shown when the manhole opening is polygonal.

Embodiments of the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to the common parts in each figure, and duplicate description is omitted.

[First Embodiment]
FIG. 1A is a plan view showing an opening structure 10 of a manhole 1 according to the first embodiment of the present invention. FIG. 1B is a sectional view taken along line BB of FIG. 1A. The opening structure 10 of the manhole 1 includes a manhole opening frame 3 and a manhole cover 5.
FIG. 2 shows a state in which the manhole cover 5 is removed from the manhole opening frame 3 in FIG. 2 (A) is a plan view, and FIG. 2 (B) is a sectional view taken along line BB of FIG. 2 (A).

The manhole opening frame 3 forms the opening 2 of the manhole 1 as shown in FIG. In the example of FIG. 2, the opening 2 is located on the ground surface 4. As shown in FIG. 1, the manhole cover 5 is attached to the manhole opening frame 3 in a horizontal state to close the opening 2. The manhole cover 5 is, for example, circular.

The manhole opening frame 3 has a frame main body portion 7 and a hole forming portion 9.
The frame main body 7 extends in the circumferential direction (hereinafter, simply referred to as the circumferential direction) surrounding the opening 2. The inner peripheral surface 7a of the frame main body 7 forms the opening 2. The frame main body 7 has a lid receiving surface 7b that receives the outer peripheral portion of the manhole cover 5 from below. In FIG. 2A, the lid receiving surface 7b is an annular surface extending in the circumferential direction and faces upward.

The frame main body 7 is fixed to the upper end surface 11b of the lower structure 11 forming the inner wall surface 11a of the manhole 1. This fixing is performed, for example, by mounting portions 7c and bolts 13 of the frame main body 7 provided at intervals in the circumferential direction. The mounting portion 7c is a portion that projects horizontally outward from the outer peripheral surface 7d of the frame main body portion 7. The lower end of the bolt 13 is fixed to the lower structure 11. The intermediate portion of the bolt 13 penetrates the mounting portion 7c of the frame main body portion 7. A nut 14 is screwed to the upper end of the bolt 13. By tightening the nut 14, the mounting portion 7c is sandwiched between the nut 14 and the lower structure 11 and fixed to the upper end surface 11b.

The hole forming portion 9 forms an insertion hole 15 as shown in FIG. In the example of FIG. 2, the insertion hole 15 penetrates the hole forming portion 9 in the vertical direction (axial direction of the inner peripheral surface 7a). The hole forming portion 9 is connected to the frame main body portion 7. In the example of FIG. 2, the hole forming portion 9 is composed of two rod-shaped portions 9a and 9b.

FIG. 3 is an explanatory diagram of the function of the hole forming portion 9 according to the present embodiment. 3 (A) is a plan view, and FIG. 3 (B) is a sectional view taken along the line BB of FIG. 3 (A).

As shown in FIG. 3, the manhole cover 5 can be inserted into the insertion hole 15 in the vertical direction (axial direction of the inner peripheral surface 7a) with the manhole cover 5 upright. The hole forming portion 9 supports the manhole cover 5 inserted into the insertion hole 15. As a result, the manhole cover 5 is kept upright.

The insertion hole 15 is formed elongated by the first to fourth inner surfaces 15a to 15d. The distance between the first and second inner surfaces 15a and 15b facing each other is equal to the width of the insertion hole 15. The distance between the third and fourth inner surfaces 15c and 15d facing each other is equal to the length of the insertion hole 15.
The width of the insertion hole 15 is, for example, the same as the thickness of the manhole cover 5, or slightly larger than the thickness of the manhole cover 5. The width of the insertion hole 15 may be set so that the manhole cover 5 fits tightly into the insertion hole 15.
The length of the insertion hole 15 is smaller than the maximum width (diameter in the figure) of the manhole cover 5. As a result, the manhole cover 5 does not fall from the insertion hole 15.

The first and second inner surfaces 15a and 15b support the front surface and the back surface of the manhole cover 5. The third and fourth inner surfaces 15c and 15d (for example, the upper ends of the inner surfaces 15c and 15d) support the end faces of the manhole cover 5.

In FIG. 1, the hole forming portion 9 is located below the manhole cover 5. That is, the hole forming portion 9 is located below the manhole cover 5 in a state of being attached to the manhole opening frame 3 so as to close the opening 2. As a result, the hole forming portion 9 does not interfere with the manhole cover 5 when the manhole cover 5 is attached to the frame main body 7 and when the manhole cover 5 is removed from the frame main body 7.

FIG. 4 is a plan view showing the positional relationship between the center C of the opening 2 of the manhole 1 and the hole forming portion 9. In FIG. 4, a portion of the opening 2 that is continuous without overlapping the hole forming portion 9 in the vertical direction is shown by a shaded area R. This area R is set to a size that allows people to pass through. That is, a person can enter and exit the manhole 1 through the area R with the manhole cover 5 upright as shown in FIG.
In the present embodiment, as shown in FIG. 4, the hole forming portion 9 is located away from the center C of the opening 2 when viewed from the depth direction of the opening 2 (vertical direction in the drawing). Therefore, the region R can be widened.

The opening structure 10 of the manhole 1 may be provided with another mechanism. For example, an appropriate locking mechanism (not shown) may be provided to prevent the manhole cover 5 from coming off the frame main body 7. The lock mechanism can be switched between a fixed state in which the manhole cover 5 closing the opening 2 is fixed to the frame main body 7 as shown in FIG. 1 and an released state in which this state is released.

According to the present embodiment described above, the manhole opening frame 3 has a hole forming portion 9 that forms an insertion hole 15 that can be inserted in the vertical direction with the manhole cover 5 upright. The hole forming portion 9 supports the manhole cover 5 inserted into the insertion hole 15 and keeps it upright. Therefore, the hole forming portion 9 serves as a place for placing the manhole cover 5. Further, since the hole forming portion 9 keeps the manhole cover 5 in an upright state, it is possible to suppress the amount of the manhole cover 5 protruding from the manhole opening frame 3 to the outside in the horizontal direction. Therefore, it is not necessary to secure a place for the manhole cover 5. For example, when the opening structure 10 is provided in the area where shrubs are densely planted, there is no problem in the place where the removed manhole cover 5 is placed at the time of inspection in the manhole 1. That is, a person can enter and exit the manhole 1 with the manhole cover 5 inserted into the insertion hole 15 and supported by the hole forming portion 9.

[Second Embodiment]
FIG. 5 shows a second embodiment of the present invention. 5 (A) is a plan view of the opening structure 10 of the manhole 1, and FIG. 5 (B) shows the manhole cover 5 as the hole forming portion 9 in the BB arrow view of FIG. 5 (A). Indicates a supported state. In the second embodiment, the points not described below are the same as those in the first embodiment described above.

In the second embodiment, one or both of the front surface and the back surface of the manhole cover 5 (both in FIG. 5) are provided with a light display unit 17 formed of one or both of a light reflecting material and a fluorescent material. As a result, the manhole cover 5 in an upright state as shown in FIG. 5B can be made to stand out. As a result, attention can be drawn to the surroundings.

For example, when the light display unit 17 is made of a light reflecting material, the light display unit 17 reflects the received light, so that the visibility is improved. When the light display unit 17 is made of a fluorescent material, the light display unit 17 emits light by the received light, so that the visibility is improved.

[Manhole structure]
FIG. 6 shows a manhole structure 20 according to an embodiment of the present invention. 6 (A) is a plan view, and FIG. 6 (B) is a sectional view taken along line BB of FIG. 6 (A). The manhole structure 20 has a manhole opening frame 3 and a lid support structure 21.

The hole forming portion 9 is not provided in the manhole opening frame 3, but is provided in the lid support structure 21. As described above, the manhole opening frame 3 does not have the hole forming portion 9, but the other configurations of the manhole opening frame 3 are the same as described above. Further, the hole forming portion 9 is different from the above in that the hole forming portion 9 is not provided in the manhole opening frame 3, but the structure of the hole forming portion 9 is the same as described above. The hole forming portion 9 is arranged in the ground so that the upper end of the insertion hole 15 can be opened to the ground. In FIG. 6, the manhole cover 5 inserted into the insertion hole 15 is supported and kept upright. In FIG. 6A, the hole forming portion 9 shows the manhole cover 5 with a thin alternate long and short dash line.

In the example of FIG. 6, the lid support structure 21 has a bottom surface forming portion 23 that forms the bottom surface 15e of the insertion hole 15. However, the bottom surface forming portion 23 may be omitted. Further, in the example of FIG. 6, the lid support structure 21 is connected to the manhole opening frame 3 via, for example, the connecting portion 25. However, the lid support structure 21 may be separated from the manhole opening frame 3.

As shown in FIG. 6, the lid support structure 21 is located outside the opening 2 of the manhole 1 in the horizontal direction (outside in the left-right direction in this figure) when the manhole opening frame 3 is used.

According to such a manhole structure 20, the same effect as that of the above-described first embodiment can be obtained. Further, in the manhole structure 20, the opening 2 of the manhole 1 overlaps both the hole forming portion 9 and the manhole cover 5 in the vertical direction while the manhole cover 5 is supported by the hole forming portion 9 in an upright state. Will not work. Therefore, it is possible to keep the size of the opening 2 as it is.

Although the manhole cover 5 is erected in the vertical direction in FIG. 6, the manhole cover 5 may be supported by the hole forming portion 9 in a state of being erected diagonally with respect to the vertical direction.
Further, the length of the insertion hole 15 (the length in the vertical direction of FIG. 6A) may be equal to or larger than the width of the manhole cover 5 (diameter in this figure). In this case, the weight of the manhole cover 5 is supported by the bottom surface of the insertion hole 15 (for example, the bottom surface forming portion 23).
Further, when the manhole cover 5 is not inserted into the insertion hole 15, a lid that closes the insertion hole 15 may be detachably attached to the upper surface of the hole forming portion 9. This makes it possible to prevent earth and sand from entering the insertion hole 15.

The structure having the manhole structure 20 and the manhole cover 5 described in the first embodiment or the second embodiment constitutes the opening structure 10 of the manhole 1 of the present invention.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of the technical idea of the present invention. For example, in the above-mentioned first embodiment, second embodiment, or manhole structure 20, any of the following modification examples 1 to 4 may be adopted, or two or more of the modification examples 1 to 4 may be adopted. It may be adopted in any combination. In this case, the points not described below are the same as described above.

(Change example 1)
FIG. 7 shows modification 1 of the manhole opening frame 3 of the present invention. FIG. 7A is a cross-sectional view taken along the line BB of FIG. 1A, showing a state in which the manhole cover 5 is removed from the manhole opening frame 3. FIG. 7B shows a state in which the manhole cover 5 is supported by the hole forming portion 9 in FIG. 7A.

As shown in FIG. 7A, the direction in which the insertion hole 15 extends in the depth direction is from the vertical direction (axial direction of the inner peripheral surface 7a) to the left side of FIG. 7A (center side of the opening 2). ). The angle of this inclination is, for example, an angle of 30 degrees or less. In the example of FIG. 7, the insertion hole 15 penetrates the hole forming portion 9 in the depth direction thereof.

In the example of FIG. 7B, the upper portion of the manhole cover 5 inserted into the insertion hole 15 is inclined to the outside of the opening 2. Therefore, the entry and exit of the manhole 1 is less likely to be obstructed by the manhole cover 5 in the (obliquely) upright state.

(Change example 2)
The hole forming portion 9 may have another configuration as long as the above-mentioned insertion hole 15 is formed and the manhole cover 5 inserted into the insertion hole 15 can be supported in an upright state. For example, as shown in the plan view of FIG. 8, the hole forming portion 9 may include two rod-shaped portions 9a and 9b and reinforcing portions 9c and 9d in which both ends are connected to the rod-shaped portions 9a and 9b. ..

(Change example 3)
Although the case where a person enters and exits the manhole 1 has been described above, the present invention can also be applied to a small manhole 1. In the small manhole 1, work (for example, inspection and maintenance) is performed on the equipment in the manhole 1 through the opening 2 without a person entering the manhole 1.

(Change example 4)
The plan view shape of the manhole cover 5 and the opening 2 is not limited to the circular shape shown in FIGS. 1 and 2, and may be another shape (for example, a square shape). An example in this case will be described below.

9 and 10 show a case where the manhole cover 5 and the opening 2 have a square shape in plan view. 9 (A) and 10 (A) are plan views, and FIGS. 9 (B) and 10 (B) are sectional views taken along the line BB of FIGS. 9 (A) and 10 (A), respectively.

In FIGS. 9 and 10, the hole forming portion 9 forms an insertion hole 15 between the hole forming portion 9 and the inner peripheral surface 7a of the frame main body portion 7. In FIG. 9, the hole forming portion 9 is provided so that the insertion hole 15 is formed along one side of the square inner peripheral surface 7a, and in FIG. 10, the insertion hole 15 is formed in the vicinity of the corner portion of the square opening 2. A hole forming portion 9 is provided in the hole forming portion 9.

In FIGS. 9 and 10, the manhole cover 5 is inserted into the insertion hole 15 and is supported by the hole forming portion 9 in an upright state. In these figures, the manhole cover 5 is illustrated by a thin alternate long and short dash line, and the manhole cover 5 is seen through to show other structures.

The square surface of the manhole cover 5 has a plurality of corner portions (four vertices in FIGS. 9 and 10) 5a to 5d. In FIGS. 9 and 10, the manhole cover 5 is inserted into the insertion hole 15 from the corner portion 5d and is in an upright state.

1 manhole, 2 openings, 3 manhole opening frame, 4 ground surface, 5 manhole cover, 7 frame body, 7a inner peripheral surface, 7b lid receiving surface, 7c mounting part, 7d outer peripheral surface, 9 hole forming part, 10 manhole Opening structure, 11 lower structure, 11a inner wall surface, 11b upper end surface, 13 bolts, 14 nuts, 15 insertion holes, 15a to 15d first to fourth inner surfaces, 15e bottom surface 17 light display, 20 manhole structure Body, 21 lid support structure, 23 bottom forming part, 25 connecting part

Claims (6)

A manhole opening frame that forms a manhole opening.
The manhole opening frame can be attached with the manhole cover laid down so as to close the opening.
The manhole opening frame has a hole forming portion for forming an insertion hole into which the manhole cover in an upright position can be inserted.
The hole forming part, coercive Chi state where the insertion of the manhole cover which is inserted into the hole supporting upright above,
A manhole opening frame in which the hole forming portion is located below the manhole cover with the manhole cover attached so as to close the opening. The manhole opening frame according to claim 1, wherein the hole forming portion is located in the opening away from the center of the opening when viewed from the depth direction of the opening. A manhole structure having a manhole opening frame for forming a manhole opening and a lid support structure.
It can be attached to the manhole opening frame with the manhole cover laid down so as to close the opening.
The lid support structure has a hole forming portion for forming an insertion hole into which the manhole cover in an upright position can be inserted.
The hole forming portion is located outside the manhole opening frame in the horizontal direction.
The hole forming portion is arranged in the ground so that the upper end of the insertion hole can be opened to the ground.
The hole forming portion is a manhole structure that supports the manhole cover inserted into the insertion hole and keeps the manhole cover upright while being arranged in the ground . The manhole structure according to claim 3, wherein the lid support structure is coupled to the manhole opening frame via a joint portion. The manhole opening frame according to claim 1 or 2 , or the manhole structure according to claim 3 or 4 .
A manhole opening structure comprising the manhole cover attached to the manhole opening frame so as to close the opening. The manhole opening structure according to claim 5, wherein a light display portion formed of one or both of a light reflecting material and a fluorescent material is provided on one or both of the front surface and the back surface of the manhole cover.

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