JPS5996358A - Construction of steel structural roof or upper stair floor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION When constructing a steel structure roof or upper floor, the so-called flat frame roof or upper floor, which is composed of orthogonal beam sets such as main beams and connecting beams, is assembled before being elevated. This relates to an improvement in a construction method in which the structure is 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 has become popular in which the framework of the upper floor is assembled into blocks and then elevated at a predetermined height.

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 flat frame roofs or upper floors, handle vertical loads and uplift forces caused by wind while in service.

To prevent the building from twisting, braces are installed at the joints between the main beam and the connecting beam.

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. The disadvantages are that the speed is slow, the cost of lifting equipment is expensive, the construction period is long, and know-how regarding lifting construction is required, which can only be done by 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. In a construction method in which a flat frame is assembled before being elevated and the structure is hoisted to a predetermined height, it is necessary to ensure that no axial force is generated in the beams at the joints between the main beams and connecting beams, or to raise the structure without attaching beams. This is a construction method for a steel structure roof or upper floor, which is characterized by carrying out the work and attaching the beams to the main beam and the connecting beam in a regular state after the work is carried out. In this way, the present invention provides a system in which no axial force is generated on the beam at the joint between the main beam and the connecting beam, which is necessary for the roof or floor, in the in-service condition, or no beam is attached. Since the work on the elevated structure is carried out in such a state, the torsional deformation caused by the uneven height of the elevated points is free without being constrained.
Additional stress due to torsional deformation can be prevented.

In addition, in the present invention, the torsional rigidity of the roof or upper floor is not ensured during the raising work [4], but the vertical rigidity of each frame is ensured, and the block roof or upper floor is It is possible to do so, and the overhead rack 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 a roof or an upper floor, 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, with a main beam 1, a connecting beam 2°, a small beam 4. The main building 5 was assembled, and work on the elevating structure was carried out with the support beams 6 attached to the ends of the connecting beams.

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 cane 3 attached.

After that, the cane 6 is fixed.

In this example, as shown in Fig. 2, after the roof frame 90 members were fully tightened, they were painted, and then after the roof was temporarily roofed, the roof 8 was mounted and fixed. Construction details can be set as desired.

Further, in this embodiment, as described above, an example is shown in which the cane 6 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 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.

The structure of the connecting beam 2 shown in this embodiment is not limited to the conventional structure shown in FIG. 1, but is shown in FIG.

It can be applied to various structures shown in FIG. Fig. 6 shows a lattice beam with a large height difference from the main beam, Fig. 4 shows a single material beam, and Fig. 5 shows a lattice beam with the same height as the main beam.

As mentioned above, according to the invention, ordinary lifting equipment ()
Elevation of roofs or upper floor frames can be carried out using rack cranes, winches, jacks, etc.), and special precision height control and climbing speed control systems are no longer required, e.g. Approximately 8 hours, approximately 2 hours for fixed work
However, since the lifting speed can be increased by the method of the present invention, the cost of lifting equipment is also low, and the construction period is approximately 1 hour for lifting and 2 hours for fixing. It can be completed in about 6 hours, which is 1/3 of the conventional time.
Furthermore, the elevated construction method, which until now could only be carried out by a specific construction company, can now be extended to a wider range of companies using trenches, making it an extremely valuable contribution to the construction industry.

[Brief explanation of drawings]

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 overall elevating work according to the present invention, and Figs. 6 to 5 are the connections shown in Fig. 1. Various other examples of beams are shown; Fig. 6 is an explanatory diagram showing a lattice beam with a large height difference from the main beam, Fig. 4 is an explanatory diagram showing a single material beam,
FIG. 5 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, O is the bridge, 4 is the small beam, 5 is the main building, 6 is the lifting equipment (truck crane),
7 is a lifting equipment (winch), 8 is a roof, 9 is a roof frame or upper floor, and A-D are overhead holding parts.

Claims (1)

[Claims] In the construction method where the flat frame of the steel structure building roof or upper floor is assembled before being elevated and raised to a predetermined height, is there a condition in which no axial force is generated in the beam at the joint between the main beam and the connecting beam? , or a construction method for a steel structure roof or an upper floor, characterized in that the elevating work is carried out without installing the girders, and after the elevating, the girders are attached to the main beam and the connecting beam in a normal state.