JP2832549B2 - Elevating step structure such as manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a manhole ascending / descending step structure that facilitates access from the uppermost step.

(Prior Art) On a wall surface of a conventional manhole or the like, a plurality of lifting and lowering scaffolding brackets are mounted so as to be vertically aligned from the doorway. In particular, in a manhole, a scaffolding metal fitting is attached from a position directly below the lid which does not interfere with the lid since the lid is used by being covered.

When the worker descends into the manhole, for example, when sitting down on the entrance surface, placing his feet on the scaffolding hardware at the top of the elevating step, descending with his back to the wall of the several steps manhole, and descending to the shoulder opening Then, the body is twisted toward the wall and descends while holding the scaffolding bracket. Also, when leaving the manhole, there is nothing to grab from the top scaffolding bracket to the entrance surface, so you will bend your hand on the ground and bend and crawl.

(Problems to be Solved by the Invention) As described above, when a worker enters or exits a manhole, an unreasonable posture or an unstable posture is forced on the entrance surface, and it is required to provide a handrail or the like. Was. However, the conventional elevating step structure is arranged in a limited surrounding environment, and it is difficult to change the arrangement structure by installing anything other than the existing scaffolding hardware.

SUMMARY OF THE INVENTION The present invention provides an ascending and descending step structure such as a manhole that facilitates entry and exit of a manhole and the like or entry and exit from an uppermost scaffolding metal fitting such as a pier under the above-described circumstances.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a lifting step structure in which a plurality of scaffolding metal fittings are buried on a wall surface of a manhole or the like and the bases thereof are arranged at appropriate intervals in a vertical direction. In the above, it is provided with a straight handrail bar that forms a bent portion by folding the upper part, of the scaffolding hardware, through the through-hole for inserting the handrail bar into the scaffolding metal fittings near the entrance surface such as a manhole, is formed vertically. A scaffolding metal fitting located below is provided with an engaging portion of the handrail bar, and the handrail bar is inserted into the through hole and stopped at the engaging portion, so that the handrail bar projects from an entrance surface of the manhole or the like. It is characterized by the following.

The bent portion of the handrail bar may be curved like a walking stick, or may be U-shaped. Railing bar 4
And as a means of engaging the scaffolding bracket 1b, one is a polygonal pillar,
There is a combination in which the other is a concave portion adapted to this, a combination in which one is a screw rod and the other is a female screw, and the like.

(Operation) First, before a user enters a manhole or the like, a handrail bar 4 is required.
The railing bar 4 is vertically lowered by holding the upper part of the platform, inserted through the through hole 2 of the scaffolding metal fitting 1a above the elevating step structure, and is then engaged with the lower scaffolding metal fitting 1b. This provides a handrail that rises from the entrance surface and guides into the interior.

Then, when the user descends, when placing the foot on the upper scaffolding bracket 1a, the user faces the wall surface from the beginning without sitting on the entrance surface by being gripped by the handrail bar 4 projecting vertically from the entrance surface. , You can easily get off with enough. In addition, when exiting from the manhole, the user can move in the same posture while grabbing the railing bar 4 and moving his / her foot from the uppermost scaffolding bracket 1a to the entrance surface.

When the railing bar 4 is not used, the bent portion at the tip of the railing bar 4 is hooked and placed on the uppermost scaffolding bracket 1a, and the manhole or the like is covered.

(Example) FIG. 1 shows that a steel material 11 bent in a substantially U-shape by a scaffolding bracket 1a is covered with a synthetic resin except for buried portions 12 and 12 buried in a wall, and a footrest portion 13 is formed. The arm 14 is formed.

An environment section 15 is formed substantially outside the center of the footrest section 13. The center insertion hole 2 is oriented in the vertical direction, and has a diameter such that a lower part of the handrail bar 4 described later can be inserted.

As shown in FIG. 4, the scaffolding fitting 1a is embedded in the uppermost wall surface of the manhole M. Further, a scaffolding metal 1b shown in FIG. 2 is buried under the scaffolding metal 1a at appropriate intervals. The scaffold 1c that extends below the lower scaffold 1b is a scaffold having a known structure. The scaffolding bracket 1b is located immediately below the scaffolding bracket 1a, but may be buried a few steps below.

Since the structure of the lower scaffolding metal 1b is substantially the same as the structure of the upper scaffolding metal 1a, the same portions are denoted by the same reference numerals and description thereof will be omitted. The differences are described in FIG.

An engagement projection 16 is provided outside the center of the footrest 13. The engagement projection 16 has a substantially quadrangular prism shape and is located below the insertion hole 2 of the upper scaffolding bracket 1a. The engagement protrusion 16 engages with the engagement recess 4a at the lower end of the handrail bar 4 shown in FIG. The engagement projection 16 may be an engagement recess, and the engagement recess 4a at the lower end of the handrail bar 4 may be an engagement projection. In addition, the engagement protrusion is wedge-shaped,
The receptacle may be a tapered hole, or a combination of a screw hole and a screw rod.

The handrail bar 4 has a stick shape as shown in FIG. 3. When not used, the curved portion 4b is hooked on the scaffolding metal as shown in FIG. 5, and when used, as shown in FIG. The lower part of the handrail bar 4 is inserted into the insertion hole 2 of the upper scaffolding metal fitting 1a, and the engaging recess 4 at the lower end thereof is engaged with the engaging projection 16 of the lower scaffolding metal fitting 1b. In this state, the upper part of the handrail bar 4 projects above the manhole or the like.

Further, other embodiments will be described below. The relationship between the engagement portion of the lower scaffolding metal fitting 1b and the insertion hole 2 of the upper scaffolding metal fitting 1a can be described by showing the shape of the upper scaffolding metal fitting 1a and the positional relationship of the insertion hole 2. Since it is understood by nature, only the upper scaffolding fitting 1a is shown, and the illustration and description of the lower scaffolding fitting 1b is omitted.

The upper scaffolding bracket 1a shown in FIG.
Is provided substantially inside the center of the footrest portion 13. Footrest 13
A triangular reflector 18 for notifying the position of the insertion hole 2 is buried above. Reference numeral 19 denotes a disk-shaped reflector buried to indicate the width. Holes 17 formed at both corners of the scaffolding fitting 1a are for inserting a connecting rod that connects all the scaffolding fittings located above and below to each other. However, this connecting rod does not protrude above the uppermost scaffolding bracket.

The upper scaffolding bracket 1a shown in FIG.
Are provided inside both ends of the footrest portion 13, that is, inside corners of the upper scaffolding bracket 1a.

In this embodiment, it is desirable to use two handrail bars 4 or a U-shaped handrail bar shown in FIG. The lower part of the U-shaped handrail bar 4 is provided with an engaging portion.

The upper scaffolding bracket 1a shown in FIG.
Are provided at the center of the footrest portion 13, and holes 17 for inserting the connecting rod are provided at respective outer portions of the scaffolding bracket 1a.

In the upper scaffold 1a shown in FIG. 9, a hole 17 for inserting a connecting rod is provided at an inner corner of the scaffold 1a.

The upper scaffolding bracket 1a shown in FIG. 10 has a rod shape, and is used between two parallel walls, a wall surface having a vertical depression, or the like. In this embodiment, the insertion hole 2 for the handrail bar 4 and the hole 17 for inserting the connecting rod are arranged outside the footrest portion 13. Each of them may be provided inside.

The upper scaffolding fittings 1a shown in FIGS. 6 to 10 are combined with the corresponding lower scaffolding fittings 1b and buried in a wall surface of a manhole or the like. The method of use is the same as in the first embodiment.

(Effect) Since the present invention has the above configuration, it is extremely easy to enter and exit from the uppermost scaffolding fitting such as a manhole, thereby improving workability. Also, by always removing the handrail bar from the engaging part and hanging the bent part on the scaffolding, the lid etc. of the manhole etc. can be used as usual, and during use the handrail bar is the topmost scaffold. Since it protrudes from above the metal fittings, it indicates during construction or work in progress, which is useful for preventing falling into manholes and alerting.

[Brief description of the drawings]

Fig. 1 shows the upper scaffolding bracket, (a) its plan view, (b)
FIG. 2 is a front view showing a part in section. Figure 2 shows the lower scaffolding bracket, (a) is its plan view, (b)
FIG. 2 is a front view showing a part in section. FIG. 3 is a handrail bar, (a) is an overall view, and (b) is an enlarged sectional view of an engaging portion at a lower end thereof. FIG. 4 is a diagram in which a handrail bar is attached to a scaffolding metal fitting of a manhole. FIG. 5 is a diagram showing a state in which a handrail bar is hung on a scaffolding metal fitting of a manhole and stored. 6 to 10 are plan views of the upper scaffolding hardware of another embodiment. FIG. 11 is a partial cross-sectional front view of a handrail bar in another embodiment. DESCRIPTION OF SYMBOLS 1 ... Scaffolding fitting, 1a ... Upper scaffolding fitting, 1b ... Lower scaffolding fitting, 2 ... Insertion hole, 3 ... Engaging part, 4 ... Handrail bar, 4a ... Engaging part.

Claims (1)

(57) [Claims] 1. A vertical handrail bar in which a plurality of scaffolding fittings are buried on a wall surface of a manhole or the like and whose bases are buried and arranged at appropriate intervals in the vertical direction, wherein a straight handrail bar is formed by folding an upper portion to form a bent portion. In the scaffolding metal fittings, a through hole for inserting the handrail bar is formed in the scaffolding metal fitting close to the entrance surface such as a manhole in the vertical direction, and the scaffolding metal fitting located below the engaging portion of the handrailing bar is provided. A step structure for elevating and lowering a manhole or the like, wherein the handrail rod is inserted into a through hole and stopped at an engaging portion, and the handrail bar is projected from an entrance surface of the manhole or the like.