JPH0913409A - Footstep means for manhole or the like - Google Patents

Abstract

PURPOSE: To obtain a footstep means which is light-weighted and good in corrosion resistance by forming a core material like a U-shape with fiber reinforced plastics, covering the core material except the leg part buried in the wall surface with synthetic resin, and inclining the upper surface of the tread part. CONSTITUTION: A core material 2 of an elevating footstep means 1 installed on the wall surface of a manhole or the like is formed with plastics(FRP) reinforced by glass fiber, carbon fiber or the like, and covered except the leg part 3 buried in the wall surface with synthetic resin 4 such as polypropylene. The tread part 5 of the synthetic resin 4 is inclined at an angle of 1-5 deg. from the upper surface central part to both side ends to easily fit to the foot of a person going up and down, and a non-slip pattern 7 and a waveform grip part 8 are provided to prevent hands and feet from slipping. The footstep means 1 are buried at fixed spaces in the wall surface of the manhole or the like to be used as a ladder for going up and down. Thus, it is possible to obtain a footstep means 1 which is light-weighted and good in corrosion resistance and has a large strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepped portion formed by coating a part of a rod-shaped core material with a synthetic resin, and a part of the core material which is not coated with the synthetic resin is a wall surface of a manhole or the like. The present invention relates to a footrest for a manhole or the like which is a leg to be buried in a vehicle.

[0002]

2. Description of the Related Art A rod-shaped core made of iron is used, and a part of the core is covered with a synthetic resin to form a foot step, and a part of the core not coated with a synthetic resin is made of a manhole or the like. Footwear for manholes, etc., with legs embedded in the wall,
For example, it is known as shown in Japanese Utility Model Publication No. 4-4040. The upper surface of the foot portion was formed straight and flat.

[0003]

In the above-mentioned known device, since the core material is made of iron, the weight of the footrest is heavy,
It was difficult to transport and install the footrests in narrow manholes and steep quays. In addition, since the leg portion made of iron is directly buried in a concrete wall surface such as a manhole, the leg portion may be corroded and damaged by the concrete, and there is a danger when ascending and descending. Things. Furthermore, since the upper surface of the foot portion is linear and flat, a large number of these footrests are arranged vertically inside the manhole and the like and used to move up and down inside the manhole. In doing so, the elevating person goes up and down in an unstable state such as stepping off the foot from the stepping portion, and there is a possibility that the elevating person may fatigue the feet and knees.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to provide a lightweight and easy-to-use manhole or the like having excellent corrosion resistance. It is intended to provide a footrest. Another purpose is to provide a footrest for manholes, etc. that is lightweight, easy to handle, has excellent corrosion resistance, can be lifted and lowered in a stable state, and has less fatigue on the legs and knees of the lifter. It is what

[0005]

In order to achieve the above object, the footrest for manholes and the like according to the present invention is characterized in that the core material is formed of fiber reinforced plastic.

Further, the core material is molded of fiber reinforced plastic, and the thickness of the synthetic resin of the foot portion covering the core material is set such that the upper surface thereof is at an angle of 1 to 5 degrees from the central part toward both ends. It is characterized by being changed so as to incline upward.

[0007]

[Function] Because the core is made of fiber-reinforced plastic, the weight of the footrest is lighter than that of the conventional core made of iron, and it is used in narrow manholes and steep quays. Not only is it extremely easy to handle and transport the equipment, but also because this footrest tool has a rod-shaped leg made of fiber-reinforced plastic, which is embedded in a concrete wall such as a manhole. Legs are not eroded by concrete.

By the way, in order for a person to continue walking in a standing posture for a long time, if the person's foot contacts a flat surface, the walking posture becomes unstable and the foot or knee is easily damaged.
It is said in walking physiology. If the surface in contact with the foot is inclined at a small angle before and after the center of 3 degrees, stable walking is possible. According to a second aspect of the present invention, in the footrest for a manhole or the like, since the upper surface of the foot step portion is inclined upward from the center portion to the side portion at an angle of 1 to 5 degrees, When a large number of tools are installed vertically in a manhole etc. and when using this footrest to move up and down, it is possible for the person who lifts and lowers the foot to be able to move up and down in a stable posture with difficulty coming off the foot. is there.

[0009]

1 to 3 relate to an embodiment of the present invention. FIG. 1 is a plan view of a footrest, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view taken along line AA of FIG. It is shown.

In the drawings, reference numeral 1 denotes the entire footwear. The footwear 1 is made of polypropylene except for its leg 3 with respect to a rod-shaped core material 2 having a substantially U-shape in plan view. And the like. The footrest 1 is fixed to the manhole with the part of the leg 3 not covered with the synthetic resin 4 being embedded in the concrete of the manhole, for example. is there.

Reference numeral 5 denotes a foot portion formed on the footrest 1.
Reference numeral 6 denotes side portions formed on both sides thereof. A large number of anti-slip patterns 7 are formed on the upper surface of the foot step portion 5 in the axial direction so that the foot of the elevating person cannot slip, and the foot step portion 5 can be gripped by the elevating person. Corrugated grip 8
Are formed in the axial direction, and reflectors 9 are provided at both ends.

The rod-shaped core material 2 is formed by dispersing glass fiber, carbon fiber, or the like in a plastic and reinforcing and reducing the weight of the fiber-reinforced plastic, commonly called FRP, into a rod shape. The cross section may be a polygon such as a hexagon or a circle.

In the footrest 1 having the above structure, the core 2 is made of fiber reinforced plastic, so that the weight of the footrest 1 is lighter than that of the conventional core made of iron. This makes it extremely easy to transport and install the footrest 1 in a narrow manhole or on a steep quay.

Also, when a large number of the footrests 1 are installed on a manhole or the like in the vertical direction, and when the footrests 1 are used to ascend or descend, the elevating person sequentially steps on the footrests 1. The leg is raised and lowered by placing a foot on the portion 5. The leg 3 is formed of a rod-shaped fiber-reinforced plastic and is embedded in a concrete wall surface such as a manhole. 3 is not eroded by concrete.

FIGS. 4 and 5 relate to another embodiment of the present invention, in which the thickness of the synthetic resin 14 of the foot portion 15 is such that the upper surface thereof is 1 to 5 degrees from the central portion S toward both ends. The structure is substantially the same as that of the above-described embodiment except that the structure is tilted upward at an angle of degrees, so the same reference numerals are given and the description thereof is omitted. In this embodiment, the rod-shaped fiber-reinforced plastic core material 2 has a circular cross section.

In the case of this embodiment, as in the case of the above-mentioned embodiments, not only the footholding device 1 is extremely easy to transport and handle but also the leg portions 3 are not corroded by the concrete. Since the upper surface of the foot step portion 15 is tilted upward from the central portion S toward both ends by an angle of 1 to 5 degrees, a large number of the footrests are installed vertically in a manhole or the like. When using a foot rest to lift up and down, the lifter's foot does not easily come off the foot part and can be lifted and lowered in a stable posture, and the lifter's foot and knee are not particularly fatigued.

[0017]

According to the present invention, since the core is made of fiber-reinforced plastic, the weight of the footrest is lighter than that of the conventional core made of iron, and the manhole is narrow. Not only is it extremely easy to handle and transport the footrests inside or on steep quays, but this footrest is made of fiber-reinforced plastic in the form of a rod-shaped leg such as a manhole. Since the legs are buried in the wall surface, the legs are not corroded by the concrete and are excellent in corrosion resistance.

According to the second aspect of the present invention, in addition to the above effects, the upper surface of the foot portion is inclined upward from the central portion toward the side portion at an angle of 1 to 5 degrees. Therefore, when a large number of the footrests are installed vertically in a manhole or the like, and when using the footrests to ascend and descend, the elevator's feet will naturally rest on the footsteps and stabilize. It can be lifted up and down in a stable condition and can be lifted up and down in a stable posture without coming off from the foot part, and it is an excellent footrest for manholes, etc. that does not cause fatigue to the legs and knees of lifters.

[Brief description of the drawings]

FIG. 1 is a plan view of a footrest for a manhole or the like according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a plan view of a footrest for a manhole or the like according to another embodiment of the present invention.

FIG. 5 is a front view thereof.

[Explanation of symbols]

 1 Footing device 2 Rod-shaped core material 3 Legs 4,14 Synthetic resin 5,15 Foot step S Central part of foot step

Claims (2)

[Claims] Claims: 1. A foot portion is formed by covering a part of a rod-shaped core material with a synthetic resin to form a foot portion, and a portion of the core material not covered with the synthetic resin is embedded in a wall surface of a manhole or the like. A footrest for a manhole or the like, characterized in that the core material is formed of fiber reinforced plastic. 2. A leg portion which is formed by covering a part of a rod-shaped core material with a synthetic resin to form a foot portion and at the same time burying a portion of the core material not covered with the synthetic resin in a wall surface of a manhole or the like. In the footrest for manholes, etc., the core material is formed of fiber reinforced plastic, and the synthetic resin wall thickness of the foot step covering the core material is adjusted so that the upper surface thereof extends from the central portion toward both end sides. A footrest for a manhole or the like, characterized by being changed so as to incline upward at an angle of 1 to 5 degrees.