JP7462237B2 - Hand Hole - Google Patents

Description

The present invention relates to a metal hand hole that is buried in the ground.

Conventionally, when wiring electric wires underground, hand holes are buried at the positions where the electric wires are to be relayed. For example, when a cover exposed above ground is opened, the hand holes expose the electric wires that are located inside and relayed. Patent Document 1 discloses a configuration in which the inclination angle of the opening and closing cover is adjusted using a height adjustment tool to match the inclination of the road surface, eliminating recesses or steps.

Japanese Patent Application Laid-Open No. 8-120700

In the handhole described in Patent Document 1, the bolt that constitutes the height adjustment tool is exposed to the road surface. If water flowing on the road surface due to rain or other reasons seeps into the thread groove of the bolt, the bolt may corrode.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a handhole that can reduce the surface area exposed to the ground while maintaining the internal volume and improve corrosion resistance.

(1) The handhole according to claim 1 is a metal handhole buried in the ground, and comprises a box-shaped main body having an upper wall with a first opening, and an inclined wall extending downward from the upper wall and expanding outward as it extends downward, a support member connected to the inclined wall in the internal space of the main body, and an upper member that is inserted into the first opening and supported by the support member, has a second opening that leads to the internal space of the main body, and a lid that seals the second opening, the support member has a height adjustment part having a rod member that is formed with a male screw and extends upward, and the upper member is positioned in the vertical direction by a female screw member that is screwed into the rod member.

According to the above configuration, the main body has an inclined wall that expands outward as it moves downward from the upper wall, so it is possible to reduce the surface area exposed to the ground while maintaining the internal volume. In addition, since the support member is disposed inside the main body and is not exposed to the outside, corrosion of the support member can be suppressed and the corrosion resistance of the handhole can be improved.

(2) The handhole according to claim 2 is the handhole according to claim 1, in which the main body has a square outer shape in a plan view, the inclined wall has a protrusion located near a corner formed by the adjacent inclined walls and protruding into the internal space of the main body, and the support member is connected to the protrusion.

The above configuration improves the load-bearing capacity of the main body against the load on the support member, and suppresses buckling of the box body due to the load.

(3) The hand hole of claim 3 is the hand hole of claim 2, in which the support member has a pair of plate-shaped arms that are respectively connected to the protrusions of the adjacent inclined walls, and the pair of arms support the height adjustment member.

According to the above configuration, by using multiple plate materials, it is possible to improve the load-bearing capacity while maintaining the light weight of the arm.

(4) The handhole according to claim 4 is the handhole according to claim 3, in which the pair of arms have opposing main surfaces that extend in the vertical direction.

With the above configuration, the arm can be made thicker in the vertical direction compared to the horizontal direction, further improving the load-bearing capacity.

(5) The handhole of claim 5 is a handhole as described in claim 3 or 4, in which one end of the pair of arms is bent in a direction away from each other, the height adjustment member supports the rod, and has a support plate fixed across the portion of the pair of arms that is bent in the direction away from each other.

With the above configuration, the support plate is fixed to the bent portion of the arm, improving the load-bearing capacity of the support member.

(6) The handhole according to claim 6 is the handhole according to claim 5, in which the support plate has a fixed portion fixed to the bent portion of the pair of arms, and a support portion that extends from the fixed portion and is bent and placed on the pair of arms, and the rod extends upward from the support portion.

With the above configuration, the support plate is placed on the arm, so the load applied to the arm can be directly transmitted from the support plate. This improves the load-bearing capacity of the support member.

(7) The hand hole of claim 7 is a hand hole according to any one of claims 1 to 6, further comprising a first sealing material disposed between the main body and the upper member.

The above configuration can prevent moisture from entering between the main body and the upper member. This can improve the watertightness of the hand hole.

(8) The handhole according to claim 8 is a handhole according to any one of claims 1 to 7, in which the main body comprises a plurality of frame-shaped lower members stacked below the inclined wall, and a second seal material disposed between adjacent lower members.

The above configuration can prevent moisture from penetrating between the vertically stacked frame bodies. This can improve the watertightness of the hand hole.

The handhole of the present invention can reduce the surface area exposed above ground while maintaining the internal volume and improve corrosion resistance.

FIG. 1 is a perspective view of a hand hole. FIG. 2 is a plan view of the hand hole. FIG. 3 is a plan view of the hand hole with the cover removed. FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 5 is a partial enlarged view of region B in FIG. FIG. 6 is a partial enlarged view of region C in FIG. FIG. 7 is a partial enlarged view of region D in FIG. FIG. 8 is a perspective view of the support member position of FIG. FIG. 9 is a bottom view of the inclined wall with the support members connected thereto. FIG. 10 is a partial enlarged view of region E in FIG. FIG. 11 is a partial side view showing the upper member inclined relative to the horizontal direction.

The following describes a metal hand hole buried in the ground according to an embodiment of the present invention, with reference to the drawings. Note that this embodiment is merely one example of the present invention, and it goes without saying that it can be modified as appropriate without departing from the gist of the present invention.

In the following, as shown in FIG. 1, the height direction (vertical direction) of the hand hole 100 is referred to as the up-down direction 1. The direction perpendicular to the up-down direction 1 (horizontal direction) and running along one side of the outer surface of the body of the hand hole 100 is referred to as the front-rear direction 2. The direction perpendicular to the up-down direction 1 and the front-rear direction 2 and running along another side of the outer periphery of the body of the hand hole 100 is referred to as the left-right direction 3.

Handholes 100 are buried underground and used as relay points for underground wiring. Handholes 100 are installed in locations that are likely to cause problems when passing electric or communication lines. Handholes 100 are installed, for example, immediately adjacent to lead-in poles, at entrances to buildings, at bends in wiring, and at specified distances along straight wiring. Handholes 100 house the connection points of wiring inside. Handholes 100 expose the housed connection points by opening the top cover.

The handhole 100 is made of metal, for example, a steel plate. The handhole 100 is made of, for example, a 1.6 mm thick steel plate. Each part of the handhole 100 is modularized. This allows the handhole 100 to be assembled on-site by bringing each part to the site. Compared to a concrete handhole 100 that is brought to the site as a single unit, this improves handling and installation efficiency. The handhole 100 described in this embodiment further reduces the area exposed above ground and improves corrosion resistance.

As shown in Figures 1 to 4, the hand hole 100 comprises a main body 10, a support member 11, an upper member 12, and a first sealing material 13.

The main body 10 has a rectangular box-like shape in plan view. The main body 10 has an angular shape in plan view. The main body 10 has a longer dimension in the up-down direction 1 than in the front-rear direction 2 and the left-right direction 3. The main body 10 accommodates the connection portion of the wiring in the internal space 48. The main body 10 has a through hole (not shown) in the side wall through which the wiring can be inserted. The main body 10 includes an upper wall 14, an inclined wall 15, a lower member 16, a second seal material 17, and a bottom plate 18.

The upper wall 14 constitutes the top plate of the main body 10. The upper wall 14 has a first opening 19 penetrating in the up-down direction 1 at a central position in the front-to-back direction 2 and the left-to-right direction 3. In other words, the upper wall 14 is a frame body having the first opening 19 in the center. The first opening 19 has a rectangular outer shape in a plan view.

The inclined walls 15 extend downward continuously from the upper wall 14. The inclined walls 15 expand outward as they extend downward. The inclined walls 15 are inclined at an angle of, for example, 67° with respect to the horizontal direction. The inclined walls 15 are located on each of the four sides of the upper wall 14, which is rectangular in plan view. The inclined walls 15 are trapezoidal in side view. As shown in FIG. 5, the lower end of the inclined wall 15 is a rib portion 46 that is bent inward. As shown in FIG. 9 and FIG. 10, at both ends of the inclined wall 15 in the front-rear direction 2 or the left-right direction 3, protruding pieces 21 that protrude toward the internal space 48 of the main body 10 are formed. Each protruding piece 21 is located near a corner 49 of the main body 10 formed by adjacent inclined walls 15 and protrudes into the internal space 48 of the main body 10. The protruding piece 21 has a triangular shape in side view with the side connected to the inclined wall 15 as the hypotenuse. The length of the protrusion 21 in the vertical direction 1 is the same or approximately the same as the length of the inclined wall 15 in the vertical direction 1.

The inclined wall 15 is formed by combining an intermediate portion 68 made of a plate material and a corner portion 69 formed in a substantially triangular pyramid shape in the horizontal direction. Specifically, the inclined wall 15 is arranged at the four corner positions in a plan view, and the horizontal edge of the intermediate portion 68 is combined with the corner portion 69 having two sides extending in the same direction as the inclination direction. As shown in FIG. 10, the intermediate portion 68 and the corner portion 69 are connected by inserting a bolt 27 into a through hole (not shown) of the flange portion 70, 71 protruding into the internal space 48 at each combination position (position of the end face) and screwing it into the nut 28. The flange portion 70, 71 constitutes the protruding piece 21. The flange portion 70, 71 can increase the thickness of the corner portion 69 of the inclined wall 15, so that the strength of the corner portion 69 against buckling can be improved. As shown in FIG. 10, a flange portion 72 for supporting a top plate 64 described later is provided at the upper end of the corner portion 69. The flange portion 72 is formed by bending the upper end portion in the horizontal direction at the boundary of the cut portion made in the up-down direction 1 of the corner portion 50 on the upper end side of the corner portion 69.

The lower member 16 is located below the inclined wall 15. As shown in FIG. 1, the lower member 16 is stacked in a plurality of layers in the vertical direction 1. In this embodiment, three lower members 16 are stacked, but the number of lower members 16 is not limited to this. The lower member 16 has a frame-like outer shape in a plan view. As shown in FIG. 6, the upper end of the lower member 16 is an upper rib 22 bent inward. As shown in FIG. 7, the lower end of the lower member 16 is a lower rib 23 bent inward. The two lower members 16 stacked in the vertical direction 1 are in a state where the upper rib 22 and the lower rib 23 are stacked. The bolt 24 is inserted through the through holes (not shown) of the upper rib 22 and the lower rib 23 in the stacked state and screwed into the nut 25, thereby integrating the stacked lower members 16. The lower member 16 adjacent to the inclined wall 15 is integrated with the inclined wall 15 by inserting a bolt 66 through the through-holes (not shown) of the upper rib 22 and the lower rib 26 and screwing it into a nut 67 while the lower rib 26 and upper rib 22 of the inclined wall 15 are overlapped.

The second seal material 17 is located between the upper rib 22 and the lower rib 23 adjacent in the vertical direction 1. The second seal material 17 is located between the lower member 16 and the bottom plate 18 described later, and between the lower member 16 and the inclined wall 15. The material of the second seal material 17 is preferably one having elasticity that can be compressed and deformed, such as ethylene propylene rubber. The second seal material 17 may be arranged in a ring shape along the circumferential direction of the lower member 16, or may be formed in a ring shape. The second seal material 17 is elastically compressed and deformed by the fastening force of the bolt 24 and the nut 25, and adheres to the upper rib 22 and the lower rib 23. As a result, the second seal material 17 suppresses the intrusion of water from the outside into the internal space 48 of the main body 10 between the stacked lower members 16, between the inclined wall 15 and the lower member 16, and between the lower member 16 and the bottom plate 18.

The bottom plate 18 has a rectangular outer shape in a plan view. The bottom plate 18 constitutes the bottom of the main body 10. The bottom plate 18 is fixed to the ground with one main surface of the plate surface facing upward using a fixing member such as a peg (not shown). The bottom plate 18 has a frame body 29 of the same type as the lower member 16 on the main surface facing upward. The end of the frame body 29 is an upper rib (not shown) that is bent inward. The frame body 29 is integrated with the lower member 16 by screwing a nut (not shown) onto the lower rib 23 of the lower member 16 located directly above and a bolt (not shown) inserted into a through hole (not shown) of the upper rib.

As shown in Figures 7 to 10, the support members 11 are connected to the protrusions 21 of the inclined walls 15 in the internal space 48 of the main body 10. The support members 11 are located at each of the four corners of the main body 10. The support members 11 include an arm portion 30 and a height adjustment portion 31.

The arm 30 is a pair of plate members. The arm 30 is made of, for example, a 4.5 mm thick steel plate. The pair of arms 30 are each connected to the protruding piece 21 of the adjacent inclined wall 15. The pair of arms 30 have their respective main surfaces 51, 52 facing each other, and the main surfaces 51, 52 extend along the vertical direction 1. One end 53 of the pair of arms 30 bends in a direction away from each other (left diagonally backward and right diagonally forward in FIG. 10). The other end 54 of the pair of arms 30 also bends in a direction away from each other (backward and forward in FIG. 10). The other end 54 of each of the pair of arms 30 has a triangular outer shape in a side view. The main surfaces 51, 52 of the other end 54 of each of the pair of arms 30 extend to match the height of the inclined wall 15 in the vertical direction 1. The end face (not shown) of the other end 54 of each of the pair of arms 30 is inclined with respect to the horizontal direction at the same or approximately the same angle as the inclined wall 15. As shown in Figures 9 and 10, the other end 54 of the pair of arms 30 is overlapped with the protruding piece 21, and is connected to the protruding piece 21 by screwing a nut 28 onto a bolt 27 inserted through a through hole (not shown) of the other end 54 and the protruding piece 21.

The height adjustment unit 31 is located inside the first opening 19 in a plan view. The height adjustment unit 31 is supported by one end 53 of the pair of arms 30. The height adjustment unit 31 includes a rod 32 and a support plate 33.

The rod 32 extends in the vertical direction 1. A male thread is formed on the circumferential surface of the rod 32. Two nuts (an example of a female thread member 34) are screwed onto the rod 32.

The support plate 33 is an L-angle material in which a flat plate is bent in a direction along one side of the main surface. The support plate 33 is made of, for example, a 4.5 mm thick steel plate. The support plate 33 is fixed across portions 55 (made of, for example, a 4.5 mm thick steel plate) of the pair of arms 30 that are bent in directions that separate them (diagonally rearward to the left and diagonally forward to the right in FIG. 10). The support plate 33 is placed with its main surface 57 in contact with the upwardly facing surfaces 56 of the pair of arms 30. The support plate 33 includes a fixing portion 35 and a support portion 36.

The fixing portion 35 is one part of the bent support plate 33. The fixing portion 35 is fixed to the bent portion (one end 53) of the pair of arms 30. The fixing portion 35 is fixed by a screw 47 that penetrates in the thickness direction with the main surface 58 abutting against the bent portion (one end 53) of the pair of arms 30. In this state, the main surface 58 of the fixing portion 35 extends along the up-down direction 1.

The support portion 36 is the other part of the bent support plate 33. The support portion 36 is arranged with its lower surface (main surface 57) in contact with the upward surface 56 of one end portion 53 of the pair of arms 30. In other words, the support portion 36 is placed on the upward surface 56 of one end portion 53 of the pair of arms 30. The support portion 36 has a through hole (not shown) that penetrates in the thickness direction (vertical direction 1 in FIG. 7). A nut (not shown) with an axial direction aligned with the axial direction of the through hole (not shown) is welded to the support portion 36. The support portion 36 is inserted into the through hole (not shown) and screwed into the nut (not shown), and further supports the bar material 32 welded to the nut (not shown). As a result, the support portion 36 supports the lower end portion of the bar material 32.

The upper member 12 is inserted into the first opening 19 as shown in Figures 1 to 4. The upper member 12 functions as a lid for the main body 10. A portion of the upper member 12 is exposed above the ground when the hand hole 100 is buried in the ground. The upper member 12 includes an intermediate portion 37, a top plate 64, a second opening 38, and a lid 39.

The intermediate portion 37 is a rectangle whose outer shape in a plan view matches the outer shape of the first opening 19. The intermediate portion 37 has a through hole 40 whose outer shape in a plan view is rectangular. The intermediate portion 37 has plate-shaped rib portions 41 near the lower ends of the four corners of the rectangle. The rib portions 41 extend inward (toward the internal space 48 of the main body 10) from near the lower end of the intermediate portion 37. The rib portions 41 have a through hole (not shown) through which the rod material 32 can be inserted. The upper end of the intermediate portion 37 is a flange portion 60 that is bent outward. The flange portion 60 has a rectangular outer shape in a plan view.

The top plate 64 is rectangular in shape in plan view, matching the shape of the flange portion 60. The top plate 64 is placed on the upper surface of the middle portion 37. The top plate 64 is fixed at the four corners 61 by screwing nuts 63 onto bolts 62 inserted into through holes (not shown) that pass through the middle portion 37 and the top plate 64 in the thickness direction.

The second opening 38 is disposed at the center of the top plate 64. The second opening 38 has a circular outer shape in a plan view. The second opening 38 communicates with the through hole 40 of the intermediate portion 37. That is, the second opening 38 communicates with the internal space 48 of the main body 10 via the through hole 40. The second opening 38 is formed, for example, on the upper surface of the top plate 64, and is disposed within a region surrounded by a protrusion 65 having a circular outer shape in a plan view. The second opening 38 is configured with a diameter smaller than the diameter of the region surrounded by the protrusion 65.

The lid 39 is a circle whose outer shape in a plan view matches the outer shape of the convex portion 65. The lid 39 has the same or approximately the same outer shape as the inner circumference of the convex portion 65. Therefore, the lid 39 has an outer shape larger than the diameter of the second opening 38. The lid 39 has the same or approximately the same thickness as the protrusion amount of the convex portion 65. The lid 39 closes the second opening 38 by being placed in the area surrounded by the convex portion 65. The lid 39 is supported by the top plate 64 while closing the second opening 38. The lid 39 is placed on the upper surface of the top plate 64 so that it can be freely attached and detached. In addition, the upper surface of the lid 39 becomes an exposed surface that is exposed above the ground when the hand hole 100 is buried in the ground.

As shown in FIG. 4, the first seal 13 is located between the edge that defines the first opening 19 of the main body 10 and the upper member 12. The first seal 13 runs along the entire circumference of the first opening 19. The first seal 13 prevents water from entering the internal space 48 of the main body 10 from between the inclined wall 15 and the upper member 12.

According to the above-described inclined wall 15, support member 11, and upper member 12, the load applied to the upper member 12 is supported by the bar 32 of the support member 11. The bar 32 is positioned away from the inclined wall 15 toward the internal space 48 by the arm 30. The load applied to the bar 32 is supported by the protruding piece 21 via the arm 30. A bending moment is applied to the protruding piece 21, which is the product of the distance from the inclined wall 15 to the bar 32 and the load. Since the protruding piece 21 is connected to the inclined wall 15 at the oblique side extending in the vertical direction 1 of the inclined wall 15, the load applied to the protruding piece 21 via the bar 32 and the arm 30 is distributed along the entire oblique side portion (base end) of the protruding piece 21. In other words, the load is distributed along the entire bending position of the protruding piece 21 that bends and protrudes from the inclined wall 15, which extends along the inclination direction of the inclined wall 15. As a result, the stress on the protrusion 21 is dispersed along the entire bending position of the protrusion 21 that bends and protrudes from the inclined wall 15. This improves the durability of the protrusion 21. In addition, the flange portions 72 of the corners 69 tend to move in a direction that narrows the cut due to the load on the protrusion 21. In other words, the flange portions 72 of the corners 69 tend to move in a direction that overlaps with each other in the vertical direction 1. This prevents moisture from entering between the flange portions 72, improving the waterproof performance of the handhole 100.

Next, a method for installing the hand hole 100 according to this embodiment will be described.
First, the soil is removed from the location where the hand hole 100 is to be buried. Then, the bottom plate 18 is fixed to the ground at the buried location using pegs.

Then, the second sealant 17 is placed at the position of the upper rib of the bottom plate 18. Next, the lower rib 23 of the lower member 16 to be stacked is overlapped at the position of the second sealant 17. Next, the upper rib of the bottom plate 18 and the lower rib 23 of the lower member 16 are integrated using bolts and nuts. This fixes the bottom plate 18 and the stacked lower members 16. Next, the stacked lower members 16 are fixed to each other in the same manner with the second sealant 17 sandwiched therebetween, thereby fixing multiple lower members 16 to the bottom plate 18.

After all the lower members 16 are fixed, the second seal material 17 is placed against the upper rib 22 of the uppermost lower member 16. Next, the lower rib 43 of the inclined wall 15 is overlapped with the second seal material 17 and the upper rib 22. Next, the upper rib 22 of the lower member 16 and the lower rib 43 of the inclined wall 15 are fixed using bolts 44 and nuts 45. The support members 11 are fixed to the protrusions 21 protruding into the inclined walls 15 using bolts 27 and nuts 28. Each of the support members 11 is fixed near the four corners 50 formed by the adjacent inclined walls 15.

Next, the intermediate portion 37 is inserted into the first opening 19. At this time, each of the rib portions 41 of the intermediate portion 37 passes through the rod material 32 of the support member 11. The intermediate portion 37 is supported by the support member 11 by abutting against the female screw member 34 that is previously screwed into the rod material 32. Next, further female screw members 34 are screwed into the four rod materials 32. The intermediate portion 37 is fixed to the support member 11 by sandwiching the rib portions 41 between the female screw members 34.

Then, the first sealant 13 is placed between the main body 10 and the intermediate portion 37. Next, the underground wiring is placed in the internal space 48, and then the lid 39 is placed on the top plate 64. As a result, the lid 39 closes the second opening 38. Next, the hand hole 100 is installed by returning soil around it.

Next, a method for adjusting the inclination of the lid 39 will be described.
Before the intermediate portion 37 is inserted into the first opening 19, the screwing position of the female screw member 34 (female screw member 34 arranged on the lower side) screwed in advance to the bar 32 is adjusted. Each female screw member 34 can lower the intermediate portion 37 supported by the support member 11 by adjusting the distance between the female screw member 34 and the support plate 33 (deepening the screwing into the bar 32). This allows each female screw member 34 to lower the position of the top plate 64 and the lid 39 relative to the ground. Conversely, each female screw member 34 can raise the intermediate portion 37 supported by the support member 11 by adjusting the distance between the female screw member 34 and the support plate 33 (deepening the screwing into the bar 32). This allows each female screw member 34 to raise the position of the top plate 64 and the lid 39 relative to the ground.

The depth of screwing of each female screw member 34 into the rod 32 is adjusted according to the height of the location to the ground. Specifically, each female screw member 34 is adjusted so that the height to the ground in the axial direction is the same or approximately the same as the thickness of the intermediate portion 37, the top plate 64, and the lid 39. As a result, each female screw member 34 is adjusted so that the distance to the ground is the same or approximately the same according to the gradient of the ground. Then, the intermediate portion 37, the top plate 64, and the lid 39 are attached in order, thereby obtaining a lid 39 that is adjusted to be flush with the gradient of the ground. As shown in FIG. 11, for example, a hand hole 100 can be obtained in which the lid 39 is inclined by +5 degrees from the left to the right.

[Effects of this embodiment]
According to the above-mentioned configuration, the main body 10 has the inclined wall 15 that expands outward as it goes downward from the upper wall 14, so that it is possible to reduce the surface area exposed to the ground while securing the internal volume. Also, since the support member 11 is disposed inside the main body 10 and is not exposed to the outside, it is possible to suppress corrosion of the support member 11 and improve the corrosion resistance of the handhole 100.

In addition, the load on each of the protrusions 21 can be more evenly distributed compared to when the protrusions 21 are positioned at any position on the inclined wall 15. For example, the load caused by stepping on the upper member 12 can be more evenly distributed to each of the protrusions 21. Therefore, the stability of the handhole 100 can be improved.

In addition, by using plate material for the arm 30, it is possible to reduce the weight compared to using solid rectangular steel or the like. In addition, by using multiple plate materials, it is possible to improve the load-bearing capacity compared to using a single plate material.

In addition, by making the arm 30 thicker in the vertical direction 1, the load-bearing capacity can be improved compared to when the arm 30 is thicker in the horizontal direction.

In addition, since the support plate 33 is fixed across the bent portion of the arm 30, the load-bearing capacity of the support member 11 can be improved compared to when the support plate 33 is supported by one side of the arm 30.

In addition, since the support portion 36 is placed on the arm portion 30, the load applied from the bar 32 to the support portion 36 can be directly supported by the arm portion 30 in the vertical direction 1. This improves the load-bearing capacity of the support member 11 compared to a case in which the load applied to the bar 32 is supported only by the horizontal connection between the arm portion 30 and the support portion 36.

In addition, it is possible to prevent moisture from entering between the main body 10 and the upper member 12. Therefore, the watertightness of the hand hole 100 can be improved.

In addition, it is possible to prevent moisture from entering between the frames stacked in the vertical direction 1. Therefore, the watertightness of the hand hole 100 can be improved.

[Modification]
In the above embodiment, the outer shape of the hand hole 100 is described as being rectangular in plan view, but is not limited thereto. The outer shape of the hand hole 100 may be of various shapes as long as it is angular in plan view. The hand hole 100 may also be circular in plan view. The first opening 19 and the intermediate portion 37 may also be circular or further polygonal in plan view. The support members 11 do not need to be disposed at all corners 50 as long as the support strength of the intermediate portion 37 can be ensured and the support portion 36 can be inclined. For example, the support members 11 may be disposed at three corners 50 to support the intermediate portion 37, which has a rectangular outer shape in plan view.

In the above embodiment, the main surfaces of the pair of arms 30 are arranged to extend along the vertical direction 1, but this is not limited thereto. The main surfaces of the pair of arms 30 may be arranged to extend along the horizontal direction. In this case, as an example, the pair of arms 30 are arranged to overlap each other in the vertical direction 1. Each of the pair of arms 30 is fixed at the other end 54 to a protruding piece 21 protruding from near the corner 50 of the inclined wall 15. Each of the pair of arms 30 may be supported at one end 53 by welding a rod material 32 oriented axially in the vertical direction 1 through the rod material 32.

The support member 11 is not limited as long as it is connected to the protrusion 21. The support member 11 may be configured, for example, by fixing a rod 32 oriented axially in the vertical direction 1 to a plate-like protrusion 21 extending horizontally by welding. The support member 11 may also be configured in such a way that a rod 32 oriented axially in the vertical direction 1 is fixed by welding to the protrusions 21 protruding from three locations: the corner 50 and a pair of positions near the corner 50 that sandwich the corner 50 horizontally.

In the above embodiment, the installation method of the hand hole 100 has been described as being assembled and installed at the burial site, but the present invention is not limited to this. The hand hole 100 may be assembled in advance at a factory or the like, and then transported to the site and buried. Since the metal hand hole 100 is lighter than the concrete hand hole 100, it can be easily transported even after assembly. The hand hole 100 may be partially assembled at a factory or the like, and then transported to the site and completed.

In addition, in the above embodiment, the method of installing the handhole 100 has been described as an example in which the inclined wall 15 is installed with the intermediate portion 68 and the corner portion 69 assembled in advance, but this is not limiting. The intermediate portion 68 and the corner portion 69 of the inclined wall 15 may be assembled at the installation site. Also, the support member 11 may be fixed to the protruding piece 21 of the inclined wall 15 in advance and then brought to the site.

[Claim 1]
A metal hand hole buried in the ground,
a box-shaped main body having an upper wall with a first opening and an inclined wall extending downward from the upper wall and expanding outward as it extends downward;
a support member connected to the inclined wall in the interior space of the body;
an upper member that is inserted into the first opening and supported by the support member, the upper member having a second opening communicating with an internal space of the main body and a lid that seals the second opening;
The support member is
The height adjustment portion has a rod member having a male screw formed thereon and extending upward,
The upper member is a hand hole that is positioned in the up and down direction by a female screw member that is screwed into the rod material.

[Claim 2]
The main body has a rectangular outer shape in a plan view,
The inclined wall has a protruding piece located near a corner formed by the adjacent inclined walls and protruding into an internal space of the main body,
The handhole of claim 1 , wherein the support member is connected to the protrusion.

[Claim 3]
The support member includes a pair of plate-shaped arms each connected to the protruding pieces of the adjacent inclined walls,
The hand hole according to claim 2 , wherein the pair of arms support the height adjustment member.

[Claim 4]
4. The handhole according to claim 3, wherein the pair of arms have respective main surfaces facing each other and extending in the vertical direction.

[Claim 5]
One end of each of the pair of arms is bent in a direction away from each other,
4. The handhole according to claim 3, wherein the height adjustment member has a support plate that supports the rod and is fixed across the portions of the pair of arms that are bent in the directions away from each other.

[Claim 6]
the support plate has a fixing portion fixed to the bent portion of the pair of arms, and a support portion bent and extending from the fixing portion 35 and placed on the pair of arms,
7. The handhole of claim 6, wherein the bar extends upwardly from the support.

[Claim 7]
The handhole of claim 1 , further comprising a first seal disposed between the body and the upper member.

[Claim 8]
The handhole of claim 1 , wherein the main body comprises a plurality of frame-shaped lower members stacked below the inclined wall, and a second sealing material (17) disposed between adjacent lower members.

10...Main body 11...Support member 12...Upper member 13...First seal material 14...Upper wall 15...Inclined wall 16...Lower member 17...Second seal material 18...Bottom plate 19...First opening 21...Projection piece 30...Arm portion 31...Height adjustment portion 32...Rod material 33...Support plate 35...Fixed portion 36...Support portion 37...Middle portion 38...Second opening 39...Cover 100...Hand hole

Claims (8)

A metal hand hole buried in the ground,
a box-shaped main body having an upper wall with a first opening and an inclined wall extending downward from the upper wall and expanding outward as it extends downward;
a support member connected to the inclined wall in the interior space of the body;
an upper member that is inserted into the first opening and supported by the support member, the upper member having a second opening communicating with an internal space of the main body and a lid that seals the second opening;
The support member is
The height adjustment portion has a rod member having a male screw formed thereon and extending upward,
The upper member is a hand hole that is positioned in the up and down direction by a female screw member that is screwed into the rod material. The main body has a rectangular outer shape in a plan view,
The inclined wall has a protruding piece located near a corner formed by the adjacent inclined walls and protruding into an internal space of the main body,
The handhole of claim 1 , wherein the support member is connected to the protrusion. The support member includes a pair of plate-shaped arms each connected to the protruding pieces of the adjacent inclined walls,
The hand hole according to claim 2 , wherein the pair of arms support the height adjustment member. The handhole according to claim 3, wherein the pair of arms have opposing main surfaces that extend in the vertical direction. One end of each of the pair of arms is bent in a direction away from each other,
4. The handhole according to claim 3, wherein the height adjustment member has a support plate that supports the rod and is fixed across the portions of the pair of arms that are bent in the directions away from each other. the support plate has a fixing portion fixed to the bent portion of the pair of arms, and a support portion extending from the fixing portion and bent and placed on the pair of arms,
6. The handhole of claim 5, wherein the bar extends upwardly from the support. The hand hole according to claim 1, further comprising a first seal material disposed between the main body and the upper member. The handhole according to claim 1, wherein the main body comprises a plurality of frame-shaped lower members stacked below the inclined wall, and a second seal material disposed between adjacent lower members.

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