JPH0441868A - Lift-up method - Google Patents

Abstract

PURPOSE:To construct a building by assembling a roof frame in a low position where a steel pipe strut capable of sliding and expanding is in shortened state, and bringing up the roof frame simultaneously with the construction of a real strut by the expansion of the strut utilizing concrete placing pressure. CONSTITUTION:A first hollow steel pipe 1a in the lowest part of a strut 1 having three hollow steel pipes 1a, 1b, 1c mutually fitted in such a manner as to be capable of sliding is stood on and fixed to a ground G. In a low position where the upper hollow steel pipes 1b, 1c are shortened, a roof frame 2 consisting of a truss 2a and a roof material 2b is assembled, concrete C is placed in the hollow steel pipe 1a, and by utilizing the placing pressure at that time, the roof frame 2 is brought up simultaneously with the construction of a real strut by expansion of the upper hollow steel pipes 1b, 1c to construct a building. Every work can be performed by the operation from the low position, and the working period can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a lift-up construction method for constructing buildings with large roof frames, such as gymnasiums, halls, various pavilions, and the like.

<Conventional technology> Conventionally, this type of lift-up construction method generally consists of installing and fixing the main support columns upright by preliminary construction, erecting the roof frame on the ground, using the main support supports as guides, and using a winch or jack. Buildings were constructed by raising the roof frame using methods such as this, and connecting the top of the main support pillars to the roof frame.

<Problems to be Solved by the Invention> However, the roof frame can only be raised after the main supports are erected and fixed, and the assembly to connect the upper ends of the main supports and the roof frame requires expensive construction. This has the disadvantage that construction work has to be carried out at the same location, which reduces workability and increases both construction period and construction cost.

The present invention has been made in view of the above circumstances, and is designed to assemble the main support columns and the roof frame at a low level, and to simultaneously erect the main support columns and raise the roof frame. The purpose is to provide a lift-up construction method that can shorten the construction period and reduce construction costs.

<Means for Solving the Problems> In order to achieve the above-mentioned purpose, the lift-up construction method of the present invention provides a plurality of hollow steel pipes so as to be expandable and contractable in the vertical direction, and also constructs the lowest hollow steel pipe. After the roof frame is erected and fixed on the ground, and the upper hollow steel pipe is shortened and connected to the upper end of the uppermost hollow steel pipe, concrete is poured into the lowermost hollow steel pipe. The roof structure is characterized in that the upper hollow steel pipe is expanded by the driving pressure and the roof frame is raised.

<Function> According to the structure of the lift-up method of the present invention, the roof frame is assembled into the ground at a low position with the upper hollow steel pipe shortened, and concrete is poured into the lowermost hollow steel pipe. Using concrete pouring pressure, the roof frame can be lifted at the same time as the main supports are erected by stretching the upper hollow steel pipe to construct the building.

<Example> Next, an example of the present invention will be described in detail based on the drawings.

Examples of the lift-up method will be explained in order.

■ As shown in Fig. 1 (a), the support l... which is fitted with Miki's first to third hollow steel pipes 1a, lb, and lc so that they can be expanded and contracted by sliding is expanded and contracted in the vertical direction. In this case, the support column 1 is fixed by erecting and fixing the first hollow steel pipe 1a at the bottom on the construction site 1c.

■ The upper second and third hollow steel pipes 1b and lc are shortened, and the truss 2a and the roofing material 2b are placed on the upper end side of the uppermost third hollow steel pipe [C] and connected. The roof frame 2 consisting of is assembled into the ground.

(2) Concrete C is cast into the first hollow steel pipe la at the bottom, and the roof frame 2 is raised by expanding each of the upper hollow steel pipes 1b and lc in turn using the casting pressure.

As shown in the vertical cross-sectional view of the shortened state in FIG. 2, the strut 1 has a first hollow steel pipe la having a large diameter and a second hollow steel pipe 1b having a smaller diameter slidably fitted therein. Along with being
A third hollow steel pipe 1c having a smaller diameter is slidably fitted into the second hollow steel pipe lb.

A flange 3 is connected to the lower part of the first hollow steel pipe 1a, and the flange 3 is fixed to the construction ground G using anchor bolts or the like, so that the support l can be erected and fixed to the construction ground G.

A protruding first stone bar 4 for regulating the stroke on the shortening side is connected to the outer circumferential surface of the upper end side of each of the second and third hollow steel pipes 1b and Ic at a predetermined interval in the circumferential direction, On the other hand, as shown in the longitudinal cross-sectional view of the stretched state in FIG.
A protruding second stomper 5 that regulates the stroke on the extension side is connected.

A concrete pouring port 6 is provided at a predetermined location in the circumferential direction on the lower end side of the first hollow steel pipe 1a, penetrating inside and outside the first hollow steel pipe 1a.

With these configurations, the concrete pouring pipe 7 (see Figure 5) is connected to the concrete pouring port 6, and the concrete C is poured into the first hollow steel pipe la from the concrete pouring device 8 (see Figure 5). The roof frame 2 is lifted by stretching the second and third hollow steel pipes 1b1c by the casting pressure, and as the poured concrete C hardens, a large A building with a roof frame 2 can be constructed.

Concrete pouring pipes 7... are each connected to a concrete pouring device 8 via a distributor 9, as shown in the bronch diagram of FIG. 5, and are connected to second and third hollow steel pipes 1b, Each of the lcs is configured to extend with the same stroke.

The above-mentioned concrete C does not harden while pouring the amount necessary to extend each of the second and third hollow steel pipes 1b and lc to the stroke end, but hardens relatively quickly after the completion of pouring. It is preferable to add an appropriate amount of a curing retarder as necessary to adjust the curing time to an appropriate value.

In the above embodiment, the support 1 is made of three hollow steel pipes 1a1b, 1
c, but it may be constructed from two or four or more hollow steel pipes.

Further, in the above embodiment, a case is shown in which a building having a roof frame 2 in the form of a flat roof is constructed, but when constructing a building having a roof frame in various shapes such as a dome shape, etc. Needless to say, the present invention can be applied regardless of the situation.

<Effects of the Invention> According to the lift amplifier construction method of the present invention, it is possible not only to assemble the roof frame, but also to connect the roof frame and the main supports,
In addition, both the erection of the main supports and the lifting of the roof structure can be performed from a low position.
This improves work efficiency, and by pouring concrete into the hollow steel pipe at the bottom, erecting the main supports and lifting the roof frame can be done at the same time, shortening the construction period and reducing construction costs. Became.

[Brief explanation of the drawing]

The drawings show an embodiment of the lift amplifier construction method according to the present invention, FIG. 1 is a schematic side view explaining the procedure of the lift amplifier construction method, FIG. 2 is a longitudinal cross-sectional view of the column in a shortened state, and FIG. 3 FIG. 4 is a longitudinal sectional view of the column in an extended state, FIG. 4 is a perspective view of the constructed building, and FIG. 5 is a block diagram showing the concrete placement distribution configuration. 1a...First hollow steel pipe 1b...Second hollow steel pipe IC...Third hollow steel pipe 2...Roof frame C...Concrete G...Construction ground

Claims (1)

[Claims] (1) A plurality of hollow steel pipes are installed so that they can expand and contract in the vertical direction, and the lowest hollow steel pipe is erected and fixed on the construction ground,
After assembling the roof frame with the upper hollow steel pipe shortened and connected to the upper end side of the uppermost hollow steel pipe, concrete is poured into the lowermost hollow steel pipe, and the casting pressure A lift-up construction method characterized by elongating an upper hollow steel pipe to raise the roof frame.