JPH0820961A - Hanger type work scaffolding plate - Google Patents

Abstract

PURPOSE:To improve working efficiency and work safety by a method wherein a pair of hanger plate parts are arranged in a protruding upward state on both sides of the front end of the upper surface of a scaffolding plate body and removably attached to a step fitment at a given height. CONSTITUTION:Hanger plate parts 23 each provided with a hook part 29 arranged at the upper end of an arm part 27 extending from the upper end of a wall contact part 25 toward the rear are disposed on both sides of the front end of the upper surface of a scaffolding plate body 21 to form a hanger type work scaffolding plate S. When the work scaffolding plate S is used, the work scaffolding plate is moved downward in such a state that a wall surface contact part 25 of a hanger plate part 23 makes contact with a step fitment 15 of a manhole 11, and the hook parts 29 are fitted in a horizontal beam 15a of the step fitment 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel hanger type work scaffolding plate which can be attached to and detached from a step fitting in a manhole. In particular, the present invention is suitable for easily constructing a work scaffold in a manhole.

[0002]

2. Description of the Related Art Conventionally, work in a manhole has been performed by placing feet on U-shaped step metal fittings which are formed at a predetermined interval from the beginning of a manhole pipe at the time of installing the marhole and after installation.

For example, as shown in FIG. 1, the worker M puts one foot on the step metal fitting 15 at the lowermost stage in the concrete painting work of the groove flow path 13 near the bottom of the manhole 11 after the installation. At the same time, the other foot is brought into contact with the inner wall surface 17 of the manhole 11, and the upper step fitting 15 is held with one hand.
It is necessary to apply concrete with a clear hand while grasping.

Further, in the case of making a hole for the main inlet pipe with a drill or the like on the wall of the manhole at a high place, the body of the worker is bound with a lifeline, and both feet are placed on the step metal fittings. .

[0005]

However, the work posture becomes unnatural at both the bottom portion and the upper and middle portions, resulting in poor work efficiency and safety problems.

For this reason, a method of manufacturing a straight wall tube with a landing having the following structure has been proposed (see Japanese Patent Publication No. 1-46657).

"One straight wall concrete pipe is horizontally divided into two pipes to form upper and lower pipes, respectively, and a ring-shaped recessed step portion is formed on the upper edge of the inner peripheral wall, and an elevating hole is provided on the side portion. On the outer peripheral side surface of the disk-shaped landing plate, a projecting ridge that can be inserted into the recessed stepped portion of the lower tube is projected, and the projecting ridge is fitted into the recessed stepped portion, and the upper surface of the ridge is the lower end of the upper pipe. It is pressed and supported by an edge, and is made watertight by filling the surroundings of the convex stripes and the concave stepped portions with mortar etc., and at the same time, the fastening plates are attached to the outer peripheral wall surfaces of the upper pipe and the lower pipe to attach the upper pipe and the lower pipe. A method of manufacturing a straight-walled pipe with a landing, characterized in that the pipe and the landing board are integrally configured. ”However, the landing is fixed and the mounting position is limited. It wasn't suitable.

[0008] In view of the above, it is an object of the present invention to provide a hanger type work scaffolding plate which can be easily attached to and detached from a step fitting having a predetermined height and can be used for various works in a manhole.

[0009]

A hanger type work scaffolding board according to the present invention solves the above problems by the following constitution.

A hanger-type work scaffolding plate which is detachably mountable to a step fitting in a manhole, and which comprises a scaffolding plate main body and a pair of hanger plate portions projecting upward from both front ends of the upper surface of the scaffolding plate main body. The plate portion is formed on the wall surface contact portion whose front end and front end are flush with each other, the arm portion that extends rearward from the upper end of the wall surface contact portion, and the upper end of the arm portion. And a hook portion that engages with the horizontal rail portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, but the present invention is not limited to this.
The same parts as those described above are designated by the same reference numerals.

(1) The hanger type work scaffolding board of this embodiment is
The scaffolding plate body 21 and a pair of hanger plate portions 23 projecting upward from both sides of the front end of the scaffolding plate body 21 (see FIGS. 2 to 3).

The hanger plate portion 23 includes a wall surface abutting portion 25 having a front end flush with the front end of the scaffolding plate body 21,
An arm portion 27 extending rearward from the upper end of the wall surface abutting portion 25
And the step fitting 1 formed on the upper end of the arm portion 27.
5 and the hook portion 29 that engages with the horizontal rail portion 15a. Although not inevitable, a reinforcing plate 31 is interposed between the wall surface abutting portions 25 of the hanger plate portion 23 in the illustrated example.

Further, the front end surface 27a of the arm portion 27 of the hanger plate portion 23 serves as an introduction surface for the step fitting 15. Attach the hook 29 of the hanger plate 23 to the step fitting 15
This is for smoothly performing the work for engaging with.

Further, the inner side surface of the hook portion 29 of the hanger plate portion 23 is a substantially semicircle which ends at the position facing the upper end of the arm portion with the step fitting introduction surface 27a of the arm portion 27 as a tangent line. This structure is also for smoothly performing the work for engaging the hook portion 29 with the step fitting 15.

From the standpoint of handleability, it is desirable that the scaffolding plate body 21 and the hanger plate portion 27 of this work scaffolding plate be substantially made of aluminum. At this time, if a honeycomb plate or the like is used, the weight is further reduced and the handleability is further improved. In addition, when it is made of iron, the weight is increased, and a problem in handleability easily occurs. Further, instead of aluminum, if there is no problem in strength, it may be made of reinforced plastic (for example, insert-molded with a metal reinforcing material).

The scaffolding plate body is preferably a checker plate (striped plate) or the like, or one whose surface is adhered with a rubber plate to prevent slipping.

The size of the scaffold plate body 21 is, for example,
Width 30 cm x length 60 cm, the height of the hanger plate is 30 c
m, the inner diameter of the hook portion 29: 25R, the outer diameter: 55R. The inclination angle of the front end surface 27a of the arm portion 27 is 50 °.
Before and after.

(2) Next, a usage mode of the hanger type work scaffolding plate will be described.

As shown in FIG. 3, the main work scaffold S is substantially horizontal.
Is moved downward while contacting the wall surface contact portion 25 of the hanger plate portion 23 or the front end surface (step metal fitting introduction surface) 27a of the arm portion 27 with the step metal fitting 15, the step metal fitting introduction surface 27a The horizontal rail 15a of the step fitting 15 is fitted into the hook portion 29 of the hanger plate portion 23, and the wall surface abutting portion 25 of the hanger plate portion 23 abuts on the wall surface of the manhole 11. In this way, unless it is pulled up, there is no risk of it coming off the step fitting, and as long as the worker M is on it, a stable state is maintained (see FIGS. 4 to 6).

For example, the concrete painting work of the groove flow path 13 near the bottom of the manhole 11 described above can be performed by attaching the working scaffold plate S to the step fitting 15 at the lower part as shown in FIG.
As shown in, it becomes possible to perform the operation in a stable posture.

Further, the manhole assembling work as shown in FIG. 5 and the manhole main pipe drilling work after assembling the manhole as shown in FIG. 6 can be carried out in a stable posture.

The work scaffolding plate S is attached to the step fitting 15
When removing from, you can easily remove it by moving it in a substantially horizontal state. Specifically, normally, the foot is transferred to the upper step metal fitting 15 and the work footing board S is grasped and moved upward while grasping the upper step metal fitting 15 with one hand while holding the work scaffolding board S with the open hand. To do.

[0024]

As described above, the hanger type work scaffolding plate of the present invention comprises the scaffolding plate body and the pair of hanger plate portions projecting upward from both sides of the upper front end of the scaffolding plate body. The portion is formed at the upper end of the arm portion, the wall surface abutting portion whose front end and the front end are formed flush with each other, the arm portion extending rearward from the upper end of the wall surface abutting portion,
Consisting of a hook portion that engages with the horizontal rail portion of the step fitting,
Depending on the configuration, the following operational effects are achieved.

The working scaffolding plate S is moved downward while the wall surface contact portion 25 of the hanger plate portion 23 or the front end surface (step metal fitting introduction surface) 27a of the arm portion 27 is brought into contact with the step fitting 15. If so, the step fitting introduction surface 2
The horizontal rail 15a of the step fitting 15 is fitted to the hook portion 29 of the hanger plate portion 23 via the 7a, and the wall surface contact portion 25 of the hanger plate portion 23 contacts the wall surface of the manhole 11. Also, the main work scaffold S from the step fitting 15
It can be easily removed by moving it upward in a substantially horizontal state.

In this way, the working scaffolding plate can be easily attached to and detached from the step fitting having a predetermined height. Therefore, the work scaffolding board of the present invention enables various operations during and after assembly of the manhole to be performed in a stable posture, which contributes to improvement of work efficiency and work safety.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a conventional work posture in a manhole.

FIG. 2 is a perspective view showing an example of a hanger type work scaffolding plate of the present invention.

FIG. 3 is a cross-sectional view showing a state immediately before attachment of the work scaffolding plate of FIG.

FIG. 4 is a cross-sectional view showing one working mode in a manhole using the working scaffolding plate of FIG.

FIG. 5 is a sectional view showing another working mode.

FIG. 6 is a sectional view showing still another working mode.

[Explanation of symbols]

 11 Manhole 15 Step metal fitting 15a Side rail of step metal fitting 21 Scaffold plate body 23 Hanger plate part 27 Arm part 27a Front end surface of arm part (step metal fitting introduction surface) 29 Hook part S (hanger type) work scaffolding board

Claims (4)

[Claims] 1. A hanger-type work scaffolding plate that is detachably attached to a step fitting in a manhole, comprising a scaffolding plate body and a pair of hanger plate portions projecting upward from both upper front ends of the scaffolding plate body. The hanger plate portion is formed on a wall surface contact portion whose front end and front end are flush with each other, an arm portion extending rearward from an upper end of the wall surface contact portion, and an upper end of the arm portion. A hanger type work scaffolding plate, comprising: a hook portion that engages with a cross rail portion of the step fitting. 2. The hanger-type work scaffolding plate according to claim 1, wherein a front end surface of the arm portion of the hanger plate portion serves as an introduction surface of a step fitting. 3. The inner surface of the hook portion of the hanger plate portion according to claim 1, wherein the inner surface of the hook portion is a substantially semicircle that is tangential to the step fitting introduction surface of the arm portion and ends at a position facing the upper end of the arm portion. Hanger type working scaffolding board. 4. The hanger-type work scaffolding plate according to claim 1, wherein the scaffolding plate body and the hanger plate portion are substantially made of aluminum.