JPH0686752B2 - Construction method for the roof of a large-scale building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a roof portion of a large-scale building.

[Problems to be solved by this invention]

In a large-scale building such as a gymnasium, the span of the beam becomes extremely large, and thus various construction methods have been conventionally used for constructing such a beam.

For example, it is adopted to erected a temporary support pillar and extend the beam in order while supporting it with this temporary support pillar, but such a construction method requires a large number of temporary materials and the construction cost becomes expensive. At the same time, the amount of work in high places will increase and the risk will increase.

It is an object of the present invention to provide a construction method for a large-scale building roof portion, which has a short construction period, a low construction cost, and can further reduce dangerous work.

[Means for solving problems]

The method of constructing the roof portion of such a large-scale building in the present invention mainly uses a crane to construct a beam.

First, a total of four large black columns are erected, one in each of the four directions.

Two large cranes are used to hoist the large beams grounded above the ground, and they are erected between the large black columns to form a U-shape.

Next, multiple girder beams are assembled like a girder in the internal space surrounded by the girders.When erection, a tie bar is stretched in the shape of a chord at the bottom of the girder straddling the left and right ends. To prevent deformation, and the girder beam is hung by a crane and installed between the left and right girders.

The other feature is that a large beam in one direction is installed between large black columns to form a square shape.

〔Example〕

The present invention will be described in detail below based on an embodiment shown in the drawings.

In the figure, 1 is a large black pillar, and one is installed in each of the four directions forming the four corners of the building, a total of four standing on the ground (see FIG. 1). A large beam 2 having a truss structure grounded above the ground is erected between the large columns 1 and 1. The large beam 2 is hung by large cranes 3 and 3 and is erected between the large columns 1 and 1 so that the left and right ends of the large beam 2 are supported by the large columns 1, and first, the three large beams 2 are installed between the large columns 1 and 1. Assemble in a U-shape (see FIGS. 2 and 3).

The construction of the girder 2 will be described in more detail. As shown in FIGS. 2 and 3, each of the large beams 2 has two split beams 2a,
It is composed of 2b and a connecting beam 2c. At the time of erection, the divided beams 2a and 2b are first grounded on the ground and hinged on a rotary mount 8 fixed on the ground (see FIG. 8). The divided beams 2a and 2b are sequentially erected by the large cranes 3 and 3, and are rotated around the rotary table 8 to stand up (see FIG. 9).

The divided beams 2a and 2b are sequentially removed from the rotary mount 8 and lifted up by the cranes 3 and 3 to be installed between the large black columns (see FIGS. 10 to 12). In this case, split beam 2a,
A trawl wire 10 is stretched from the ground to 2b to prevent deformation due to wind load and finely adjust the erection accuracy. In addition, while the split beams 2a and 2b are suspended, a connecting beam 2c is attached between the split beams 2a and 2b and connected to the large black pillar 1 at a predetermined position,
The cranes 3 and 3 are released, the construction accuracy is confirmed, and the trawl wire 10 is removed. The girder 2 is installed between the big columns 1 and 1 by sequentially repeating the same operation.

The girder 2 erected as described above is erected in a U-shape that surrounds three directions except one direction (see FIG. 3), and the girder is placed in the internal space surrounded by these girders 2 and 2. The cross girder beam 4 for combining the beams in a circular shape is erected (see FIGS. 4 and 5).

The double girder beam 4 is a combination of two H-shaped steels, and the entire lengthwise direction is formed in a mountain shape. At the time of erection of the girder beam 4, a tie bar should be installed at the bottom of the girder beam 4 across the left and right sides.
11 is stretched like a string to prevent deformation due to bending, etc. The tie bar 11 expands and contracts by controlling the tension (see Fig. 7).

This double girder beam 4 is hoisted by two cranes 3 and 3 and is bridged and connected between the existing left and right large girders 2 and 2, and the above work is carried out in order, and the double girder beam is placed in the U-shaped internal space. Four
A beam frame combined in a cross beam shape is formed by the connecting beams 9 (see FIGS. 4 and 5).

Finally, the remaining one-direction girder 2 is erected between the big black columns 1 and 1 and assembled into a square shape with four girders, and the beam structure of the roof is completed (see FIG. 6).

〔The invention's effect〕

Since the present invention hangs and erects the beams grounded on the ground by the two cranes as described above, it is possible to reduce temporary materials as much as possible, shorten the construction period, and reduce the construction cost. .

Further, the work at a high place is reduced, and the risk of work can be reduced.

Furthermore, since the girder beams are lifted while being prevented from being deformed by the tie bars, temporary pillars are not required and the construction can be speeded up.

[Brief description of drawings]

1 to 6 are perspective views showing a construction order of the present invention, FIG. 7 is a perspective view of a cross beam, and FIGS. 8 to 12 are perspective views showing a construction order of a girder erection. 1 ... Daikoku Pillar, 2 ... Large Beam, 3 ... Crane, 4 ... Double Girder Beam, 5 ... Central part of Double Girder Beam, 6 ... Left and right ends of Double Girder Beam, 7 ... Temporary Post, 8 ... Rotating mount, 9 ... Connecting beam, 10 ... Tra-wire, 11 ... Tie bar.

Claims (1)

[Claims] Claims: 1. Four large black pillars are erected one by one in four directions, a large beam grounded on the ground is hoisted by two cranes, and it is erected between the large black pillars and assembled in a U shape, Next, multiple girder beams are assembled like a girder in the U-shaped internal space surrounded by girders.The girder girder is formed in a mountain shape in the entire length direction. A tie bar is stretched in the shape of a string across the left and right ends at the bottom of the girder beam to prevent deformation, and the girder beam is hung by a crane and erected between the left and right girders, and then assembled into a girder shape. , A method for constructing a roof of a large-scale building, characterized by erection of a large beam in the other direction between large black columns to form a square shape.