JP2001159144A - Manhole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a manhole structure, in which the mounting works of a cover for preventing a fall to a manhole iron-cover seat can be simplified. SOLUTION: This manhole structure has a manhole iron cover 2 which closes the top face of the opening of a manhole iron-cover seat 1 and a cover 3 for preventing the fall arranged to the manhole iron-cover seat 1 in a horizontal attitude in the lower section of the manhole iron cover 2. A horizontal hole 14 supporting the base end section 13 of the cover 3 for preventing the fall when the cover 3 is positioned in the horizontal posture and a vertical hole 15 supporting the base end section 3 of the cover 3, when the cover 3 is positioned in an upright posture are formed to the manhole iron-cover seat 1. A locking section 21 is installed at a free end section 29 of the cover 3 for preventing the fall. When the cover 3 for preventing the fall is positioned in the horizontal posture, the free end section 29 side is locked and held to the manhole iron-cover seat 1 in a vertically unmovable manner via the locking section 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole structure for entering and exiting an underground cable or a sewer system for electric power and communication from the ground surface, and more particularly to a manhole iron cover for closing an upper surface of a manhole opening. The present invention relates to a manhole structure in which a fall prevention lid is disposed below.

[0002]

2. Description of the Related Art As shown in FIG. 12, a manhole structure of this kind is designed to prevent the manhole iron cover 2 from falling even if the manhole iron cover 2 comes off from the manhole iron cover seat 1 as shown in FIG. The lid 41 is located on the upper surface of the opening of the manhole, thereby preventing a pedestrian or the like from falling into the manhole. Further, the fall prevention lid 41 is also configured as a ladder to serve as a ladder for ascending and descending into the manhole, and when used as a ladder, FIG.
As shown in the figure, the fall prevention lid 41 is supported on the manhole iron lid seat 1 in an obliquely upward standing posture.

In such a manhole structure, the base end of the fall prevention cover 41 is provided with a plurality of bolts 4 on the manhole iron cover 1.
The lock mechanism 43 locks the fall prevention cover 41 to prevent it from falling down when the fall prevention cover 41 is swung upward to take an upright posture.

[0004]

In the conventional manhole structure, a plurality of bolts 42 must be tightened in order to fix the base end of the fall prevention cover 41 to the manhole iron lid seat 1. Manhole iron lid seat 1 for prevention lid 41
It takes time and effort to attach to the unit, and the workability is poor. In addition, there is a problem in that the structure of the fall prevention cover 41 is complicated and the manufacturing cost is increased by the amount of providing the lock mechanism 43 on the fall prevention cover 41.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manhole structure capable of simplifying the structure while reducing the labor and time for attaching the fall prevention cover to the manhole iron cover.

[0006]

SUMMARY OF THE INVENTION The manhole structure to which the present invention is directed is a manhole iron cover 2 for closing the upper surface of the opening of the manhole iron cover 1, and a horizontal posture of the manhole iron cover 1 below the manhole iron cover 2. And a fall-preventing lid 3 which is disposed at the position shown in FIG. The fall prevention cover 3 is supported on the manhole iron cover 1 so as to be switchable between a horizontal posture and a standing posture. The manhole iron cover 2 here may be a cast product or another material. The shapes of the manhole iron cover 1 and the manhole iron cover 2 include a round shape and a square shape. Further, as long as the fall prevention cover 3 is supported in a substantially horizontal posture, the concept includes a slight inclination posture, and the standing posture may be either upright or inclined.

The manhole iron cover 1 allows the base end 13 of the fall prevention cover 3 in an upright posture to be inserted.
Hole 14 for supporting the vehicle, and the fall prevention cover 3 in the standing posture
A vertical hole 15 for supporting the base end portion 13 by allowing the base end portion 13 to be inserted, and a free end portion 29 of the fall prevention lid 3 in a horizontal posture.
Means for releasably locking and holding the sides.

More specifically, a regulating projection 18 is provided on the base end 13 of the fall prevention cover 3 so as to protrude in the lateral direction, and a deep portion of the horizontal hole 14 of the manhole iron cover 1 and an upper portion of the vertical hole 15 communicate with each other. A guide groove 17 is provided from the insertion hole 16 of the horizontal hole 14 to the bottom of the vertical hole 15 for slidingly guiding the regulating projection 18. In addition, an opening 19 through which the base end 13 of the fall prevention lid 3 is provided is provided on the upper surface of the lateral hole 14, and the base end 1 of the fall prevention lid 3 is provided through this opening 19.
3 can be changed from a state inserted into the horizontal hole 14 to a state inserted into the vertical hole 15, and a state inserted from the vertical hole 15 into a state inserted into the horizontal hole 14. Here, the regulating protrusion 18 and the guide groove 17 include one provided with only one each and one provided with two or more.

The free end 2 of the fall prevention lid 3 in a horizontal position
As means for locking and holding the 9 side to the manhole iron lid 1
A fitting hole 28 is provided in the manhole iron cover 1, and the free end portion 29 of the fall prevention cover 3 is inserted into and engaged with the fitting hole 28, and is removed from the fitting hole 28. A locking portion 21 that can be switched is provided.

The fall prevention cover 3 includes a pair of right and left support rods 8 and 9.
And a plurality of treads 1 spanned between both supporting rods 8 and 9
0, and at least one of the two supporting rods 8, 9 is provided with a locking portion 21 which is locked and held by the manhole iron lid seat 1. . The locking portion 21 includes a case where it is provided on only one of the support rods 8 and 9 and a case where it is provided on both of the support rods 8 and 9. In that case,
The manhole iron lid seat 1 has each support rod 8 of the fall prevention lid 3.
9, two sets of left and right horizontal holes 14 and vertical holes 15 are provided.

As the locking portion 21 of the fall prevention cover 3, an engaging member 22 that is removably inserted into and engages with a fitting hole 28 of the manhole iron lid seat 1, and an engaging member 22 having a tip end thereof Is provided with a spring member 23 that urges and presses so as to fit into the fitting hole 28 of the manhole iron cover seat 1. Spring member 23
Examples include a coil spring and a rubber material.

[0012]

When the fall prevention lid 3 is mounted on the manhole iron lid seat 1 in a horizontal position, the base end 13 of the fall prevention lid 3 is inserted into the side hole 14 of the manhole iron lid seat 1, and the side hole is inserted. 14
And the locking portion 21 of the fall prevention cover 3 is fitted into the fitting hole 28 of the manhole iron cover 1. In this state, the vertical movement of the base end 13 side of the fall prevention lid 3 is regulated by the lateral hole 14, and the free end 29 side of the fall prevention lid 3 is fitted with the locking portion 21 and the manhole iron lid seat 1. The vertical movement is regulated by the fitting engagement with the mating hole 28, and the fall prevention lid 3 is securely attached to the manhole iron lid seat 1 in a horizontal posture.

When the fall prevention cover 3 is switched from the normal horizontal position to the upright position, the engagement between the locking portion 21 and the fitting hole 28 of the manhole iron cover 1 is released, and the fall prevention cover 3 is removed. The free end portion 29 is swung upward to switch to the upright posture, and the base end 13 of the fall prevention cover 3 in the upright posture is fitted into the bottom of the vertical hole 15 to prevent the fall from occurring at the peripheral wall of the vertical hole 15. The lid 3 is supported.

[0014]

According to the manhole structure of the present invention, the base end 13 of the fall prevention cover 3 is inserted into the lateral hole 14 provided in the manhole iron lid seat 1, and the play provided in the fall prevention cover 3 is provided. The fall prevention cover 3 can be securely attached to the manhole iron lid 1 in a horizontal posture only by locking and holding the end portion 29 side to the manhole iron lid 1. Therefore, it is possible to reduce the labor and time required to install the fall prevention lid 3 on the manhole iron lid seat 1 and to install it in a short time. Then, the fall prevention lid 3
The horizontal hole 14 and the vertical hole 1
5, the structure for supporting the fall prevention lid 3 is simplified, and the cost required for manufacturing the fall prevention lid 3 and the manhole iron lid seat 1 can be reduced. In addition, since the horizontal hole 14 and the vertical hole 15 can increase the contact length of the fall prevention cover 3 with the base end portion 13, it contributes to reliably support the fall prevention cover 3.

The regulating protrusion 1 on the base end 13 of the fall prevention cover 3
8 can be moved along the lateral hole 14 and the vertical hole 15 of the manhole iron lid seat 1 by the guide groove 17, and the base end 13 of the fall prevention lid 3 can enter and exit through the opening 19 on the lateral hole 14. The fall prevention cover 3 is
8 can be swung up and down around the base end while being inserted into the guide groove 17, and the trouble of switching between the horizontal posture and the standing posture can be reduced.

Free end 2 of fall prevention lid 3 in horizontal position
As means for locking and holding the 9 side to the manhole iron lid 1
A fitting hole 28 is provided in the manhole iron cover 1, and the free end portion 29 of the fall prevention cover 3 is inserted into and engaged with the fitting hole 28, and is removed from the fitting hole 28. If the locking portion 21 that can be switched is provided, the fall prevention lid 3 is securely mounted in a horizontal posture without rattling in the vertical direction only by fitting and engaging the locking portion 21 into the fitting hole 28. I can put it.
On the other hand, if the locking portion 21 is pulled out from the fitting hole 28, the fall prevention lid 3 can be switched from the horizontal posture to the standing posture, and this posture switching operation can be easily performed.

The fall prevention cover 3 is composed of a pair of right and left support rods 8.9.
And a plurality of treads 1 spanned between both supporting rods 8 and 9
In the case of a ladder shape having 0, two sets of horizontal holes 14 and vertical holes 15 are provided on the manhole iron lid seat 1 corresponding to the respective support rods 8 and 9 of the fall prevention cover 3 on the left and right, respectively. The present invention can be appropriately applied to the ladder-shaped fall prevention lid 3 by providing the locking portion 21 which is locked and held by the manhole iron lid seat 1 on at least one of the support rods 9. .

An engaging member 22 in which the engaging portion 21 is removably inserted into and engaged with a fitting hole 28 provided in the manhole iron cover seat 1, and the tip of the engaging member 22 is
In a mode in which the spring member 23 is pressed and urged so as to be fitted into the fitting 8, the engaging member 22 is securely inserted into the fitting hole 28 in a state where the fall prevention lid 3 is attached in a horizontal posture. It is safe because it can be fitted and engaged. On the other hand, when the fall prevention cover 3 is switched from the horizontal position to the upright position, it is only necessary to pull out the engagement member 22 from the fitting hole 28 against the pressing force of the spring member 23, thereby improving workability at the site. It will be excellent.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 8
1 shows a first embodiment of a manhole structure according to the present invention. As shown in FIG. 1, a ring-shaped manhole iron cover 1 buried in a road surface or the like, and an opening closing an upper surface of the opening of the manhole iron cover 1 are shown. It has a manhole iron cover 2 that can be closed, and a fall prevention cover 3 that is disposed below the manhole iron cover 2 in the manhole iron cover seat 1 in a horizontal posture. The manhole iron cover 1 is made of a cast product in which a flange-shaped base 1b is protruded from the outer peripheral edge at the lower end of a ring-shaped cylinder wall 1a.
The upper part of the inner peripheral surface of the manhole iron cover 2 is formed in a tapered downward tapered shape, and the lower tapered outer peripheral surface of the manhole iron cover 2 is received and supported.

The manhole iron cover 2 is made of a cast product having a hinge 4 and a floating prevention mechanism 5, and the hinge 4 is fitted into a hinge receiving portion 6 provided on the inner surface of the manhole iron cover seat 1. The lid 2 opens and closes around the hinge receiving portion 6. The levitation prevention mechanism 5 is detachably locked to a downwardly hooked engaging portion 7 protruding from the inner surface of the manhole iron cover seat 1 so that the manhole iron cover can be driven by water pressure, pneumatic pressure, or vibration caused by traveling of a vehicle or the like. 2 prevents lifting.

The fall prevention cover 3 is made of stainless steel,
As shown in FIG. 2, a pair of left and right support rods 8, 9 and a plurality of steps spanned between the two support rods 8, 9 are formed in a frame shape by a pipe material made of iron, synthetic resin, or the like. The ladder is configured in the shape of a ladder having the crosspiece 10 and the ladder for raising and lowering into the inside of the manhole is formed by raising the manhole iron lid seat 1 in an upright posture with respect to the manhole iron lid seat 1 in an inclined posture. By providing an auxiliary frame 11 for closing the gap with the inner surface of the manhole iron lid seat 1 on each of the supporting rods 8 and 9, the auxiliary frame 11 prevents a pedestrian or the like from falling into the manhole from the gap. I have.

The fall prevention cover 3 can be switched from a horizontal posture to a standing posture by swinging upward about the base ends (right side in FIG. 1) of both support rods 8 and 9. In other words, on the inner surface of the manhole iron lid 1, support portions 12 are integrally provided on the left and right sides of the hinge receiving portion 6. Each support 12 has
As shown in FIG. 6, when the fall prevention cover 3 is in a horizontal position, a lateral hole 14 for supporting the base end 13 by allowing each base end 13 of the support rods 8, 9 to be inserted, and a fall prevention cover A vertical hole 15 is provided for supporting the base end 13 by allowing the base end 13 of the support rods 8 and 9 to be inserted when the base 3 is in the upright posture. Between the hinge receiving portion 6 and each of the support portions 12, 12, grips 20, 20 for raising and lowering into the inside of the manhole are provided.

In each of the support portions 12, the inner portion of the horizontal hole 14 and the upper portion of the vertical hole 15 communicate with each other.
A pair of left and right guide grooves 1 extending from 6 to the bottom of the vertical hole 15.
7 and 17 are formed in a bent shape (see FIGS. 7 and 8). At the distal end of the base end portion 13 of each of the support rods 8, 9, as shown in FIG. 3, regulating protrusions 18, 18 are respectively provided to protrude in the left-right direction. Is done. The support portion 12 has a cutout 19 formed in the upper surface of the lateral hole 14.
3 can freely move in and out, so that the base end 13 can be inserted into the lateral hole 14.
Can be switched from the state in which the stopper 3 is in the horizontal position to the upright position while the regulating projection 18 is in the guide groove 17, and similarly, the switch from the upright position to the horizontal position can be performed. Can also.

On the inner surface of the manhole iron cover 1, there are provided receiving portions 27, 27 for receiving the free ends 29 of the support rods 8, 9 of the fall prevention cover 3 by the upward recesses 27a. . A locking portion 21 is attached to the free end (left side in FIG. 1) of one support rod 9 of the fall prevention cover 3. As the locking portion 21, an engagement member 22 and a spring member 23 are housed in a cylindrical body 24 as shown in FIG. That is, the tubular body 24 is fixed to the free end of the support rod 9.

One end of the engaging member 22 is removably mounted in the cylindrical body 24, and one end of the engaging member 22 is provided on the receiving portion 27 of the manhole iron lid seat 1 in a horizontal direction. Hole 2
8 can be removably fitted and engaged. The spring member 23
The engaging member 22 is made of a coil spring, and urges the engaging member 22 so that one end of the engaging member 22 projects and fits into the fitting hole 28 of the manhole iron cover 1. When the engaging member 22 is fitted into the fitting hole 28 of the manhole iron cover 1, the free end 29 side of the fall prevention cover 3 is locked and held by the manhole iron cover 1 so as to be unable to face upward. An L-shaped notch 25 is formed in the cylindrical body 24.
An operation lever 26 fixed to the engagement member 22 is inserted through the notch 25. Operation lever 2
6 is retracted along the notch 25 so that the notch 25
(The state shown by a two-dot chain line in FIG. 5), the engagement member 22 is locked in a state where it comes out of the fitting hole 28 and retreats into the cylindrical body 24. When the operating lever 26 is removed from the bent portion 25 a of the notch 25, the locked state of the engaging member 22 is released, and one end of the engaging member 22 is projected from the cylindrical body 24 by the spring member 23.

Next, how to use the fall prevention cover 3 will be described in detail. When the fall prevention cover 3 is mounted on the manhole iron cover 1 in a horizontal posture, the support rods 8 of the fall prevention cover 3
9 while inserting the base end 13 of each of the support rods 8 and 9 into each of the lateral holes 14 of the manhole iron cover 1 through the insertion opening 16 thereof, and adjusting the guide protrusions 17 of the base end of each of the support rods 8 and 9 to each of the guide grooves 17. To fit. Then, the control projections 18 of each of the supporting rods 8 and 9 are slid along the guide grooves 17 to the depth side of the lateral hole 14 so that the base end 13 of each of the supporting rods 8 and 9 extends to the depth of each lateral hole 14. It is fitted (the state shown by the solid line in FIG. 6). Next, the engaging member 22 of the engaging portion 21 of one of the supporting rods 9 is made to protrude and fit into the fitting hole 28 of the manhole iron lid seat 1 (the state of FIG. 5). In this state, the base ends 1 of the support rods 8 and 9 of the fall prevention lid 3
On the third side, the vertical movement is restricted by the restricting projections 18 abutting on the upper and lower surfaces of the guide groove 17, and the free end 29 side of the supporting rods 8, 9 is engaged with the engaging member 21 of the locking portion 21 of the supporting rod 9. Vertical movement is restricted by fitting engagement between the fitting hole 22 and the fitting hole 28 of the manhole iron cover seat 1.

When the fall prevention cover 3 is switched from the horizontal position to the upright position, the operating lever 26 of the locking portion 21 of the support rod 9 is operated from outside the cylindrical body 24 so that the bending portion 2 of the notch 25 is formed.
5a, the engaging member 22 is pulled out of the fitting hole 28 and held in a state of being retracted into the cylindrical body 24, and in this state, the free end portion 29 side of the fall prevention lid 3 is upward. Rock it. As a result, the fall prevention lid 3 is switched to the upright posture by swinging around the regulation projections 18 as the base end portions 13 of the support rods 8 and 9 pass through the inside of the through hole 19. At this time, the regulating protrusions 18 are located in the guide grooves 17, and the base end portion 13 does not come off through the opening 19. Fall prevention lid 3 in standing position
After the base end 13 of each of the supporting rods 8 and 9 is automatically guided to the upper part of the vertical hole 15 communicating with the horizontal hole 14, it falls into the bottom of the vertical hole 15 and is supported by the peripheral wall of the vertical hole 15.

(Second Embodiment) FIGS. 9 to 11 show a second embodiment of the manhole structure according to the present invention. The second embodiment has substantially the same configuration as the first embodiment. However, the regulating projection 18 is provided at the base end 13 of the supporting rods 8 and 9.
The vertical hole 15 is provided at a position closer to the distal end by a predetermined distance from the edge of the manhole.
2 penetrates to the lower surface. In the vertical hole 15, a restriction groove 30 for receiving the restriction protrusion 18 and restricting the downward movement limit of the fall prevention cover 3 is formed to be concave along the vertical hole 15.

When the fall prevention cover 3 is mounted on the manhole iron cover 1 in a horizontal posture, the base ends 13 of the supporting rods 8 and 9 are inserted into the lateral holes 14 (see the state shown by the solid line in FIG. 9). ), The engaging member 22 of the locking portion 21 of the support rod 9 is fitted into the fitting hole 28 of the iron cover 1 of the manhole as described above. When switching the fall prevention lid 3 from the horizontal posture to the standing posture,
After the support rods 8 and 9 of the fall prevention lid 3 in the horizontal posture are once extracted from the horizontal holes 14, the support rods 8 and 9 are inserted into the vertical holes 15 from the upper surface thereof. (The state shown by the two-dot chain line in FIG. 9).

In the second embodiment, the manhole iron cover 1
By effectively using the upper surface to the lower surface of the support portion 12, the vertical hole 15 can be provided long, and the length of the supporting rods 8 and 9 supported by the peripheral wall of the vertical hole 15 can be increased by this amount, and The fall prevention lid 3 can be more securely supported. Further, as can be seen from the second embodiment, each support 12
In the above, the horizontal hole 14 and the vertical hole 15 may be provided independently in a non-communicating state.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment.

FIG. 2 is a plan view of the first embodiment.

FIG. 3 is an enlarged plan view of a support portion of the manhole iron cover according to the first embodiment.

FIG. 4 is a vertical sectional side view showing a locking portion of a fall prevention cover according to the first embodiment.

FIG. 5 is a vertical sectional side view showing an operation of a locking portion of the fall prevention cover according to the first embodiment.

FIG. 6 is a vertical sectional side view showing a horizontal hole and a vertical hole of a support portion of the manhole iron cover according to the first embodiment.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a vertical sectional side view showing a main part of the second embodiment.

FIG. 10 is a sectional view taken along line CC of FIG. 9;

FIG. 11 is a sectional view taken along line DD of FIG. 9;

FIG. 12 is a plan view of a conventional example.

FIG. 13 is a vertical sectional side view showing a conventional lock mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole iron lid 2 Manhole iron lid 3 Fall prevention lid 8.9 Support rod 10 Stepping bar 13 Base end of fall prevention lid 14 Side hole 15 Vertical hole 16 Side hole insertion hole 17 Guide groove 18 Regulatory projection 19 Passage 21 Locking portion 22 Engaging member 23 Spring member 28 Fitting hole 29 Free end of fall prevention lid

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kochi Kishimoto 2-6-1 Shinkita Higashi, Joto-ku, Osaka-shi, Osaka F-term in Yodocasting Co., Ltd. 2D047 BA02 BA09

Claims (5)

[Claims] 1. A manhole iron cover (2) for closing an upper surface of an opening of a manhole iron cover (1), and a fall prevention cover (3) disposed in a horizontal position on the manhole iron cover (1) below the manhole iron cover (2). A fall prevention lid 3 is supported on the manhole iron lid seat 1 so as to be freely switchable between a horizontal position and an upright posture, and the manhole iron lid seat 1 is provided when the fall prevention lid 3 is in the horizontal position. The insertion of the proximal end 13 of the
When the fall prevention cover 3 is in the upright posture, the insertion of the base end 13 thereof is allowed to allow the base end 13 to be inserted.
Vertical hole 15 for supporting the vehicle and the fall prevention lid 3 in a horizontal position
And means for releasably locking and holding the free end 29 side of the manhole. 2. A restricting projection 18 is provided on the base end portion 13 of the fall prevention cover 3 in a lateral direction, and a deep portion of the horizontal hole 14 of the manhole iron cover 1 and an upper portion of the vertical hole 15 communicate with each other. From the insertion hole 16 of the horizontal hole 14 to the bottom of the vertical hole 15,
A guide groove 17 for slidingly guiding the regulating projection 18 is provided, and a through hole 19 through which the base end 13 of the fall prevention lid 3 is provided is provided on the upper surface of the lateral hole 14. The base end 13 of the fall prevention lid 3
2. The manhole structure according to claim 1, wherein the structure can be changed from a state inserted into the horizontal hole 14 to a state inserted into the vertical hole 15 and a state inserted from the vertical hole 15 into a state inserted into the horizontal hole 14. 3. A fitting hole 28 is provided in the manhole iron cover 1 as means for locking and holding the free end portion 29 side of the fall prevention cover 3 in the horizontal posture to the manhole iron cover 1. The free end portion (29) of the prevention lid (3) is provided with a locking portion (21) that can be switched between a state in which the fitting hole (28) is fitted and engaged and a state in which it is removed from the fitting hole (28). Manhole structure. 4. The fall prevention cover 3 includes a pair of right and left support rods 8.
9 and a plurality of treads 10 bridged between the two supporting rods 8 and 9. The manhole iron lid seat 1 has the supporting rods 3 of the fall prevention lid 3. 8.
9, two sets of horizontal holes 14 and vertical holes 15 are provided on the left and right sides, and at least one of the two supporting rods 8, 9 is engaged with the manhole iron lid seat 1 by a locking portion. The manhole structure according to claim 1, wherein the manhole structure is provided. 5. An engaging member 22 in which the engaging portion 21 is removably inserted into and engaged with a fitting hole 28 provided in the manhole iron cover seat 1, and a tip of the engaging member 22 is formed into a fitting hole. 28
The manhole structure according to claim 3 or 4, further comprising a spring member (23) for urging the member so as to be fitted therein.