JPH0270861A - Mounting and overhaulting method of work scaffold in step-up technique - Google Patents

Abstract

PURPOSE:To assemble and overhaul a work scaffold rapidly and easily even in narrow space by inserting struts into insert pipes at the outer end sections of a plurality of brackets installed to the formwork of a manhole, etc. and horizontally framing handrail pipes among the upper ends of the struts. CONSTITUTION:The base end sections 3d, 3f of a plurality of brackets 3... consisting of horizontal materials 3a and diagonal materials 3b, etc. are mounted to the vertical flanges 1a of the formwork 1 of a manhole, etc. while using an existing work scaffold as a scaffold. The lower end sections of struts 4... are inserted into insert pipes 3g set up at the outer end sections of each bracket 3..., and handrail pipes 5... are horizontally framed detachably among the upper end sections of adjacent struts 4.... Accordingly, upper and lower scaffolds are assembled successively while employing work scaffolds under work scaffolds only at one step as scaffolds, and the scaffolds are overhauled and removed together with the formwork 1 from upper sections in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application 1 The present invention relates to a method for installing and dismantling a work scaffold in a step-up construction method for constructing concrete cylindrical structures such as manholes, silos, and chimneys.

[Prior Art 1] Conventionally, when constructing, for example, a concrete manhole at a site, a so-called step-up construction method has been adopted in which formwork is successively added upward and concrete is poured.

In this type of construction method, work scaffolding is required when assembling formwork above and pouring concrete. Conventionally, temporary work scaffolding has been constructed around the manhole formwork using single pipes, etc. This was done by erecting a horizontal single pipe, etc., using clamps, etc., and then erecting a scaffolding board over the horizontal single pipe.

[The problem that the invention tries to solve! ] However, the above-mentioned conventional work scaffolding is not only complicated and time-consuming to assemble, but also requires a large space to be excavated around the manhole formwork for temporary construction, and the complicated scaffolding makes work difficult. There were problems such as getting in the way.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to provide work scaffolding for step-up construction that can be quickly and easily assembled and does not require a large space. The purpose is to provide a method for installing and dismantling the

[Means for Solving the Problems 1] The method for attaching the work scaffold in the step-up construction method of the present invention is to install the existing work scaffold attached to the outside of the formwork in the step-up construction method in which formwork is successively added upward. The feature is that a new work scaffold is attached to the outside of the formwork that has been added to the upper end of the formwork, and the method for dismantling it is to replace the existing work scaffold attached to the outside of the formwork. The scaffolding is characterized in that the work scaffold attached to the formwork added to the upper end of the formwork is dismantled, and the work scaffold is mainly composed of horizontal members and diagonal members. A bracket whose base end is attached to the formwork, a column whose lower end is inserted and fixed into an insertion tube provided at the outer end of the bracket, and a handrail that is removably suspended horizontally between the upper ends of two adjacent columns. It is characterized by consisting of a pipe.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, numeral 1 indicates an outer formwork for a manhole, and 2 an inner formwork for a manhole, which are successively added to the top and used to pour concrete.

3 is a bracket, and as shown in tj%2 figure and #S3 figure, horizontal member 3a and diagonal member 3b are connected to two reinforcing members 3c.
are integrally connected.

A mounting bracket 3d is attached to the base end of the horizontal member 3a, and is adapted to fit into the vertical 7 langes la of the manhole outer form 1.6 The mounting bracket 3d has a bottle hole. 3
d' is bored, and a pin 3e is inserted to fix it to the vertical seven runs 1a of the manhole outer form 1.

A mounting bracket 3f is also attached to the base end of the diagonal member 3d, and is adapted to be similarly fitted onto the seven vertical flanges 1a of the outer formwork 1 for a manhole.

The horizontal member 3a and the diagonal member 3b are close to each other at their tips and are integrally connected to the insertion tube 3g.

Further, in FIG. 1, reference numeral 4 denotes a support column, the lower end of which is inserted into the insertion hole 13g of the bracket 3.

As is clear from FIG. 4, a stopper 4a is provided around the lower part of the support column 4, and serves as a stopper when inserted into the insertion tube 3g. The pillar 4
A gravity lock 41] is protruded from the upper end of the handrail pipe 5, and as shown in FIG. 1, the end of the handrail pipe 5 is connected thereto. That is, as is clear from FIGS. 5 and 6, the handrail pipe 5
Insertion holes 5a' are bored in the flat parts 5a at both ends,
The gravity lock 4b of the support column 4 is inserted into this and fixed therein.

After assembling as described above, a scaffold board (not shown) is installed on the bracket 3'' to complete the work scaffold.

Next, a step-up construction method using a work scaffold with the above configuration will be explained.

First, as shown in FIG. 17, the formwork F2 is added onto the formwork F1 using the lower work scaffold S.

When the addition of formwork F2 is completed, as shown in Fig. 8,
A work scaffold S2 is attached or assembled on the outer periphery of the formwork F2 using the work scaffold S1.

When the assembly of the work scaffold S2 is completed, as shown in FIG. 9, the worker moves onto it and pours concrete C into the formwork F2.

When concrete C has been poured, a new formwork is connected to the formwork F2 during curing or after hardening in the same manner as in the work shown in Fig. 7, and the new formwork is connected in the same manner as in the work in Fig. 8. Assemble a new work scaffold around it, transfer to this work scaffold, pour concrete, and repeat the above work N.

Further, when dismantling the work scaffold S, the top work scaffold S is dismantled using the work scaffold S one step below, and the formwork F is also dismantled at the same time.

Subsequently, the worker moves to the work scaffold S one level lower and dismantles the work scaffold S and formwork F on the upper floor in the same way, and then sequentially dismantles them from above using the same procedure.

[Effects of the invention] Since the work scaffold is directly attached to the upper part of the formwork outside the manhole, the work scaffold can be reliably and quickly attached and fixed or dismantled as the formwork is added, and the work scaffolding around the formwork below can be fixed and dismantled. Not only does it take up less space, but step 7
The Tsupue method can be executed efficiently.

[Brief explanation of the drawing]

Figure 1 is an overall view of the assembled work scaffold attached to the manhole formwork, Figure 2 is a side view of the bracket, and Figure 3 is a side view of the bracket.
The figure is a top view of the bracket, Figure 4 is a front view of the support column, and Figure 5 is a top view of the bracket.
The figure is a side view of the handrail pipe, FIG. 6 is a plan view of the handrail pipe, and FIGS. 7 to 9 are cross-sectional views sequentially illustrating a method of attaching a work scaffold in the step-up construction method. 1... Outer formwork for manhole, la... 7 vertical runs,
2... Inner formwork for manhole, 3... Bracket, 3
a...Horizontal material, 3b...Diagonal material, 3c...Reinforcement material,
3d...Mounting metal, 3d'...Bottle hole, 3e...Pin, 3f...Mounting metal fitting, 3g...Plug-in pipe, 4...
Post, 4a...stopper, 4b...gravity
Lock, 5...handrail pipe, 5a...flat parts at both ends,
5a' insertion hole, F, F, , F2...formwork, S. S,, S2...Work scaffolding.

Claims (1)

[Scope of Claims] 1. In the step-up construction method in which formwork is added to the upper end of the formwork in sequence, the outside of the formwork added to the upper end of the formwork using an existing work scaffold attached to the outside of the formwork as a scaffold. A method for attaching a work scaffold, characterized in that a new work scaffold is attached to the work scaffold. 2. In the step-up method in which formwork is added to the top one after another, the existing work scaffolding attached to the outside of the formwork is used as a scaffold, and the work scaffolding attached to the outside of the formwork added to the top of the formwork is used as a scaffold. A method for dismantling a work scaffold, characterized by dismantling it. 3. The above-mentioned work scaffold is mainly composed of horizontal members and diagonal members,
A bracket whose base end is attached to the formwork, a column whose lower end is inserted and fixed into an insertion pipe provided at the outer end of the bracket, and a removable horizontal structure between the upper ends of two adjacent columns. 3. The method for installing and dismantling a work scaffold in a step-up construction method according to claim 1 or 2, comprising a handrail pipe.