JPS62309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for constructing a steel structure roof or an upper floor, consisting of a set of orthogonal beams such as a main beam and a connecting beam.
The present invention relates to an improvement in a construction method in which a so-called flat frame roof or upper floor is assembled before being elevated, and then lifted or pushed up to a predetermined height.

Conventionally, when assembling frames for roofs and upper floors, the mainstream construction method has been to sequentially erect individual members at predetermined height positions.

However, in recent years, the skills of jumpers who perform assembly work at heights have generally declined, and temporary safety measures required for work at heights have become more stringent. A construction method in which the framework of the upper floor is assembled into blocks and then elevated to a predetermined height has become popular.

According to the above-mentioned conventional construction methods, it is difficult to reduce the unevenness in height during the construction of the roof or upper floor.

For planar frame roofs or upper floors, braces are installed at the joints between the main beam and the connecting beam in order to handle the vertical load during service, handle the uplifting force caused by the wind, and prevent the building from twisting. things will be done.

As a result, even if the roof is a flat frame or the upper floor, the assembled state becomes like a three-dimensional frame. For example, when hoisting the roof using four or more supporting points, the roof may be twisted and deformed due to uneven height. When this occurs, additional stress is generated on the frame, and in order to keep this stress low, it is necessary to keep the height unevenness small.

Therefore, in conventional construction methods, in order to reduce unevenness in height, multiple hydraulic jacks are used to raise the height at the same time in a flat state, and control the rate of rise. As a result, the lifting speed is slow, the cost of lifting equipment is expensive, the construction period is long, and know-how regarding lifting construction is required, which is only possible for specific construction companies.

The present invention eliminates the above-mentioned drawbacks and provides a method that can be constructed in a short time using extremely common lifting machines, such as truck cranes or winches.
The gist of this is that in the construction method where the flat frame of the steel structure building roof or upper floor is assembled before being elevated and then elevated to a predetermined height, no axial force is generated in the beam at the joint between the main beam and the connecting beam. steel structure roof or upper floor, characterized in that the work is carried out without any braces attached, and after the hoisting is done, the braces are attached to the main beams and connecting beams in the normal condition. This is the construction method. Thus, the present invention, in service condition,
During the work on the roof or floor, no axial force is applied to the beams at the joints between the main beams and the connecting beams, or the work is carried out without the support beams attached, so that the points on the roof are mutually connected. The torsional deformation caused by the uneven height of the structure can be left in a free state without being restricted, and additional stress caused by the torsional deformation can be prevented.

In addition, in the present invention, although the torsional rigidity of the roof or upper floor is not ensured during the elevating work, the rigidity in the vertical direction of each frame is ensured. It is possible to do this, and the overhead structure holding part can also be placed in the same position as in the case of the conventional construction method.

As described above, the present invention makes it possible to eliminate the need for height control and rising speed control during the process of elevating the roof or upper floors, which were most difficult in conventional construction methods.

Next, a conventional example and an embodiment of the present invention will be explained based on FIGS. 1 to 3.

Figure 1 shows an example of the framework of a roof or upper floor to be elevated using the conventional method.The main beam 1, connecting beams 2, minor beams 4, and purlins 5 are assembled, and the support beams 3 are attached to the ends of the connecting beams. The work on the elevated structure was being carried out under such conditions.

In the present invention, as shown in FIG. 2, the hoisting work is carried out using a truck crane 6 and a winch 7 on the hoist holding parts A, B, C, and D, respectively, without the above-mentioned cane 3 attached. After that, the cane 3 is fixed.

In this example, as shown in Fig. 2, after the members of the roof frame 9 were fully tightened, they were painted, and then after the roof was temporarily roofed, the roof 8 was mounted and fixed. The construction details can be set arbitrarily.

Further, in this embodiment, as described above, an example is shown in which the cane 3 is removed, but the cane may be in a state where no axial force is generated. As a means of achieving the above, it is possible to leave the ends or intermediate joints of the beams unjoined, or to leave the joints (bolt holes) of the connecting beams and beams 3 loose. Conceivable. Further, in this embodiment, the lifting equipment arrangement is a combination of a truck crane and a winch as shown in FIG. 2, but a single type of lifting equipment may be used, and the method of combination can be set arbitrarily.

Note that the structure of the connecting beam 2 shown in this embodiment is not limited to the conventional structure shown in FIG.
It can be applied to various structures shown in FIG. Figure 3 shows a lattice beam with a large height difference from the main beam.
Figure 4 shows a single material beam, and Figure 5 shows a lattice beam with the same height as the main beam.

As mentioned above, according to the present invention, it is possible to carry out the work of elevating the roof or upper floor frame using ordinary lifting equipment (truck crane, winch, jack, etc.), and it is possible to carry out the work of raising the frame of the roof or the upper floor with special precision. There is no need for a height control or a rising speed control system, and for example, conventionally it took about 8 hours to lift and about 2 hours to fix, a total of about 10 hours, but with the method of the present invention, the rising speed can be increased. Because of this, the cost of lifting equipment is low, and the construction period can be completed in about 3 hours, including about 1 hour for lifting and about 2 hours for fixing.
The construction cost is 1/3, and the elevated construction method, which until now could only be carried out by a specific construction company, can now be expanded to a wider range of contractors, making it an extremely significant contribution to the construction industry.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the frame of the roof or upper floor to be elevated, Fig. 2 is a schematic perspective view of the entire elevating work according to the present invention, and Figs. 3 to 5 are the connections shown in Fig. 1. Various other examples of beams are shown. Figure 3 is an explanatory diagram showing a lattice beam with a large height difference from the main beam, Figure 4 is an explanatory diagram showing a single material beam, and Figure 5 is an explanatory diagram showing a beam with a large height difference from the main beam. FIG. 2 is an explanatory diagram showing a lattice beam having the same height as the main beam. In the figure, 1 is the main beam, 2 is the connecting beam, 3 is the beam, 4 is the small beam, 5 is the main building, 6 is the lifting equipment (truck crane), 7 is the lifting equipment (winch), 8 is the roof, 9 is a roof frame or an upper floor, and A to D are overhead holding parts.

Claims (1)

[Claims] 1. In a construction method in which the planar frame of the steel structure building roof or upper floor is assembled before being elevated, and the structure is elevated to a predetermined height, no axial force is generated in the beam at the joint between the main beam and the connecting beam. Alternatively, a method for constructing a steel structure roof or an upper floor, characterized in that the elevating work is carried out without installing the braces, and after the hoisting is done, the braces are attached to the main beam and the connecting beam in a normal state.