JPS6213659A - Steel bar construction method of building - 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 Field of Industrial Application This invention relates to a method for constructing a column and beam steel frame in the field of constructing a steel frame or steel reinforced concrete building.

Conventional technology Conventional steel frame construction methods are based on the fact that it is extremely difficult to build steel columns vertically, and the accuracy of the steel frame itself is dependent on processing errors at the factory and the site environment (curving due to temperature, solar radiation, etc.). It is assumed that errors are complicatedly intertwined and it is difficult to rely on them easily. Therefore, as shown in Figure 6, for example, the four steel columns 1 at the corner and the steel beams 2 attached to them...
Assemble them one after the other and temporarily tighten them with temporary bolts to form a one-block frame assembly. After that, distortion correction was carried out for the purpose of adjusting the span and construction accuracy.
The general procedure was then to perform final tightening with high tension bolts or final welding.

Problems to be Solved by the Invention ■ In the case of the conventional steel frame construction method described above, the steel frame columns and beams 1.2 must undergo the process of straightening the distortion in units of blocks that are organized to a certain extent, and during that time, the steel frame construction Since it is not possible to proceed to the next process, there is a problem that the work procedure is poor and the process becomes longer.

■ Conventionally, the span adjustment of a steel framework was carried out by, for example, stretching a wire rope 4.4 diagonally around the column head of the steel framework and tightening it with a turnbuckle (or a hinge, etc.) 5.5, as shown in Figure 7. Alternatively, if the steel frame is large, as shown in Figure 8, tighten the wire rope 4 using a pulley 6 and winch 7, and while swinging the column 1 back and forth and left and right, insert a wedge called a tekka between the beams or between the beams. -I've been doing this by fixing it between Hashirama. However, four wire ropes 4 are required for each pillar, and a large number of turnbuckles 5 and hinges are required to apply tension, making storage and transportation management of these temporary materials cumbersome and costly. In addition, the rebuilding of the columns after span adjustment is done by preparing as shown in Figures 7 or 8 and shaking the entire steel frame block. There is, but...
The erection accuracy of each column is ultimately greatly influenced by the manufacturing (processing) accuracy of the steel frame, and in reality it is set to a value determined by chance within a range that is considered to be approximately good. That is the reality. That is, there is a problem in that there is a limit to increasing the accuracy of construction.

■As mentioned above, the erection accuracy of steel frame erection is greatly influenced by the manufacturing accuracy of the steel frame, and it requires a lot of effort to correct the distortion in order to absorb the steel frame manufacturing error, which requires a lot of time and skilled technology. There was a problem in that it required

■As shown in Figures 7 and 8, the wire rope 4 is stretched across multiple floors for each block of the steel framework, and this wire rope portion becomes a failure in slab construction, making the work procedure extremely difficult. The process is complicated, and therefore, as mentioned in ①, there is a problem that the process takes a long time.

Means for Solving the Problems As a means for solving the above-mentioned problems, the steel frame construction method of the present invention, as shown in the embodiments in Figs. The process of erecting Column 1 and temporarily tightening and fixing it with temporary bolts; (B) Continuing to attach means to constrain (adjust and constrain) the erection accuracy of the steel column (1); A step of measuring the erection accuracy of the steel column (1), standing it vertically, and firmly restraining it using excitation restraint means so that the vertical accuracy of the steel column (1) does not go out of order; (1) fixing the beam (2) by fully tightening bolts or welding it while restrained as described above, and (d) attaching the beam (2) between the columns that have been vertically erected and fixed as described above.
The process of assembling the parts and fixing them by final tightening of bolts or final welding.

Working steel columns 1 are constructed using temporary materials for the purpose of adjusting the erection accuracy, as in the past, as the work following the erection of each column 1 involves checking the erection accuracy and performing final tightening or welding of the bolts. There is no need for any type of equipment, and of course there is no work involved in installing or removing it.

In addition, once the installation of the beams 2 is completed, the next process of floor slab construction can be started immediately, thereby shortening the construction period. Particularly in the case of a steel frame structure, it is possible to construct the floor slab at an early stage in parallel with the installation of the beams, so it is possible to make some large-scale preparations for the actual welding of the columns.

In addition, as a method to deal with the case where beam 2 cannot be installed due to the limit of the erection accuracy of the column, the interval between the joints of the beam is widened to match the limit accuracy of the steel column, and the widened part is covered with a splice plate. Cover.

Embodiment Next, a preferred embodiment of the present invention shown in FIGS. 1 to 5 will be described.

Fig. 1 shows a situation in which a steel frame column 1 with a height equivalent to two floors has been erected, the accuracy of the erecting has been measured, and the column is erected vertically.

That is, when the steel column 1 is erected, its joint portion 10 is temporarily tightened and fixed with temporary bolts.

At the same time, around the steel column 1, four (or at least two is acceptable) lightweight jacks 11. 11... are installed. Each lightweight jack 11 is installed in a state in which it takes a reaction force to the existing steel beam 2 and is attached to a gazette plate 12 at a floor height position on the steel column 1.

Therefore, the construction accuracy can be adjusted by, for example, lowering a plumb bob from the top of the steel column 1, measuring the vertical accuracy, and pushing or pulling it with light jacks 11 arranged in four directions at right angles. After rebuilding the distortion and achieving the target vertical accuracy, each lightweight jack 11.
The column 1 will be firmly restrained (fixed) so that its vertical accuracy will not be disturbed.

In this restrained state, the joint lO is completely fixed by final tightening of high tension bolts or final welding.

By repeating the same process, all the required steel columns 1 are erected as shown in Fig. 2.

On the other hand, a beam 2 is assembled between the vertically erected and permanently fixed columns and the column 1.1, and this is also fixed each time by the method of final tightening with high tension bolts or final welding.

The timing for installing and fixing beam 2 is as follows:■ All columns 1...
・This is done as a follow-up work after completing -9 construction 6 or after a certain number of columns 1...9 construction has been completed.

By the way, even in the implementation of the method of the present invention, there is a limit to the accuracy of building the column 1, and it is predicted that even if you try to incorporate the beam 2, it may not fit, but there are some countermeasures to ensure that the beam 2 fits smoothly. An example of the method is shown in FIGS. 3 to 5.

That is, the spacing S between the joints of the beams 2 is widened by several millimeters in accordance with the limited construction precision of the steel column 1, and the widened portions are covered with splice plates 13 and 14. The splice plates 13 and 14 have bolt holes 13b on one half of the splice plates.

14b is provided as a long hole with a length that accommodates the erection accuracy of the steel column 1, and the bolt holes 13a and 14a on the other half are provided as round holes. Therefore, the beam 2 and the gazette brake (1a) of the column 1 can be firmly fixed via the splice plates 13, 14 by fully tightening the high tension bolts.

In this way, the steel columns 1 and beams 2 can be erected in an orderly and step-by-step manner by fully tightening or welding each piece without using straightening ropes, turnbuckles, or hinges. As soon as the beams 2 are installed, the next step, the floor slab construction, can begin, which shortens the construction period.

Furthermore, even after the columns 1 and beams are completely tightened or erected by welding as described above, erection accuracy measurements and level measurements are performed, and the measurement results are fed back to the steel frame fabrication. In other words, when constructing the steel frame for the next upper floor, the steel frame will be fabricated to correct errors in the construction accuracy and level of the current floor.

Effects achieved by the invention■ As described above in conjunction with the embodiments,
In the steel frame construction method of the present invention, the steel columns 1 and beams 2 are fully tightened and welded piece by piece, so the work procedure is extremely simplified. Furthermore, as soon as the beams 2 are installed, the next process of floor slab construction can be started, so the construction period can be significantly shortened.

■ In particular, in the case of steel structures, the floor slab construction can be done in parallel with the installation of beams, making it possible to utilize RoniRing type scaffolding and reducing the amount of temporary scaffolding required.

■ In this way, floor slab work can be completed early, making it possible to make some large-scale preparations for welding columns, making it possible to move forward to robotizing welding in the future.

■ Wire ropes and fliers that need to be straightened out,
The amount of difficult-to-handle temporary construction materials such as turnbuckles is greatly reduced, greatly contributing to the reduction of temporary construction costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the construction accuracy adjustment and restraint maintenance of steel columns in the construction method of this invention, Fig. 2 is a perspective view of the situation in which the columns are erected and beams are assembled, and Fig. 3 is the columnar construction method. A front view of the beam joint, Figures 4 and 5 are front views of the splice plate, and Figure 6 is a perspective view showing the construction status of the conventional steel frame construction method.-1 Figures 7 and 8 are the conventional FIG. Part 2 Part 3 WJ II4F! m Sukh Rice 7 @ Rate 13 Figure 5 14t) 14a 61st! ! Figure 7 8B

Claims (1)

[Scope of Claims] [1] (a) A step of erecting a steel column and temporarily tightening and fixing it with temporary tightening bolts, and (b) attaching means to restrict the erection accuracy to the steel column (1). (c) measuring the erection accuracy of the steel column (1), standing it vertically, and restraining and holding the steel column (1) using the restraining means so that the vertical accuracy of the steel column (1) does not go out of order; 1) The process of fully tightening or welding the bolts while restrained as described above, and (d) incorporating the beam (2) between the columns that have been erected and fixed vertically as described above. A method of constructing a steel frame for a building, which is characterized by comprising the steps of fixing by final tightening or welding of bolts.