JPS60223545A - Iron skeletal assembling construction method of large roof - 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] The present invention relates to a method of assembling a steel frame for a large roof in the construction of a building having a large interior space, such as a gymnasium, hall, or indoor baseball field.

[Background of the invention]

Large roofs with trussed steel frames are used in gymnasiums, music halls, leisure centers, and other buildings that require large internal spaces. However, as the scale increases, construction requires the use of many very large lifting machines such as tower cranes, and work at high places is not efficient and can be dangerous. , equipment for safety measures will also be important, and the overall construction cost will be high.

Another method is to reduce the need for work at heights by hoisting roof trusses into units, but if a temporary support stand is provided for each joint, a large number of man-hours are required to assemble and dismantle the temporary equipment. In addition, since the internal work space is limited, a tower crane or the like is required that has an external space for hoisting the truss unit from the outside, and a tower crane or the like that has the corresponding lifting height and lifting capacity.

[IA Ming's purpose]

This invention was developed in order to solve the problems in the prior art as described above, and the method and procedure for assembling the large roof steel truss were devised to make effective use of the internal space and the pre-erected part. The purpose of this project is to reduce the size of machinery used, such as lifting machinery, and improve construction efficiency, thereby reducing construction costs.

[Structure of the invention]

In the method of this invention, first, the compression link at the top of the roof and the tension ring at the bottom of the roof are assembled. Compression rings and tension rings are made by assembling steel beams into circular or polygonal shapes.The compression ring at the top bears the axial compressive force, and the tension ring that makes up the bottom edge of the roof bears the axial compressive force that is applied by roof loads, etc. It is designed to bear the tensile force of

The compression ring can be assembled by hoisting the steel frame onto a central temporary support platform using a truck crane or other device installed inside the construction site.

Next, using an internal truck crane or the like, a plurality of sets of two pre-erecting parts each consisting of a pair of girders and a pre-erect truss between the girders are successively erected between the compression ring and the tension ring.

The girder and the leading truss can be divided into units, in which case a temporary support stand is provided at the joint of the girder. At this time, the space between the preceding construction parts can be used as an installation space for the above-mentioned crane, etc., and a space for assembling the truss units constituting the roof truss.

In this state, the roof truss is structurally stable for the time being, and then the succeeding middle truss that connects these precedingly erected portions is erected. This work is carried out using an internally assembled tower crane or an external crane, but it is possible to use the preceding construction part to erect the trailing middle truss.
In particular, there is no need for a temporary support stand, there are few restrictions on work space, and it can be handled with a small number of cranes.

Furthermore, one end of the trailing intermediate truss can be constructed by a truss unit assembled on the ground, and the truss unit can be hoisted to a position where it is connected to the preceding construction part using a winch or the like.

After the roof steel frame is assembled in this manner, the panels and the like that cover the roof surface are successively fixed to the steel frame to finish the roof.

〔Example〕

Figures w41 to 10 show an example of the construction procedure in the method of assembling a large roof steel frame according to the present invention, and the work is carried out in the following procedure.

(1) Assemble the central temporary support stand 9 that supports the top of the large roof and the intermediate temporary support stand 10 on the outer periphery (Fig. 1).

(2) Assemble the compression ring 1 on the central temporary support stand 9 (Fig. 2). Note that the compression ring 1 is integrally attached with the joint section 4 of the girder in advance at the factory.

(3) Assemble the tension ring-4 on the bottom edge of the roof (Figure 3). At this time, the first section of the divided girder 3 is also assembled at the same time (tensioned at the factory and integrated with the ring 2) and supported by the intermediate temporary support stand 10, as shown in the figure, between the first sections of the girder 3. Assemble truss 5 during the advance.

(4) Furthermore, install the intermediate temporary support stand 11, add the m2 section of the girder 3, and assemble the intermediate leading intermediate truss 5' (Figure 4). In this case, the work order of the four preceding construction parts will be determined in relation to parallel work and lifting machinery. It is also desirable to carry out the work as symmetrically as possible so that the load is applied equally to all parts.

(5) Add the third and fourth sections of the girder 3 and connect the compression ring 1 and tension ring 2 (Fig. 5).

Work efficiency can be improved by assembling the third and fourth sections of the girder 3 in advance and lifting them up using a truck crane.

(6) Perform the work in (5) above for the remaining pre-erected parts (Figure W46).

(7) Complete the construction of the preceding construction part (Figure 7).

Regarding the trailing construction part, in parallel with the work described below (3), the ground assembly of the truss unit 7, which will be described later, is progressing.

Additionally, construction of the roof top portion 8, etc., will begin.

(8) Regarding the trailing construction section, truss units 7 assembled into beams directly below the construction location are successively constructed between the girders 3 (Fig. 8). In this case, a frame for hoisting the truss unit is provided in the preceding construction part, and the truss unit can be hoisted up using a winch or the like.

(9) Sequentially erect the truss units 7 and connect the girders 3 of the previously erected portions (Fig. 9).

2) Assemble the remaining portion of the truss using a tower crane, etc., and complete the trailing middle truss 6 (Figure 10)
.

・The construction of the steel frame part of the large roof is completed by completing the work from 11 to 2.

Figure W411 and Figure 12 show the construction of the preceding construction part, and correspond to the work (6) above. When the second section of the girder 3 is erected by the truck crane ν, the truss unit 7 is placed on the trestle at the ground level.
Groundwork is being carried out. Further, a truss hoisting frame 13 for hoisting the truss unit 7 is provided on the girder 3 where the connection between the compression ring l and the tension ring 2 has already been completed.

FIGS. 13 and 14 show the construction of the trailing intermediate truss 6, and correspond to the operations (8) to α. described above.

The truss unit 7 is sequentially rolled up using dry sweat, etc.
Erection will be carried out between the three girders in the preliminary construction section. Furthermore, a tower crane 14 is assembled inside, the steel frame placed between the erected truss units 7 is lifted up, and the trailing truss 6 is sequentially assembled. After the assembly of the parts other than the mast part of the tower crane 14 is completed, the tower crane 14 is used for later processes such as depositing PC boards for the roof, and after the work is completed, it is sequentially dismantled and removed by an external crawler crane, etc. . In addition, after all of the central temporary support stand 9 and intermediate temporary support stand io, il are temporarily installed, they are jacked down, dismantled, and removed.

Figures 15 and 16 show the state when the roof steel frame has been assembled, and the structure is such that the entire roof truss supports the roof load, and then work is carried out on the roof surface panels or ceiling section.

〔Effect of the invention〕

Assembly of the compression linked tension ring is divided into a leading construction part and a trailing construction part, and the construction is configured such that the leading construction part installed between the compression ring and the tension ring is used to perform the construction work of the trailing construction part. Therefore, the interior space can be effectively used as a work space. In other words, it is possible to install lifting machines such as crawler cranes and tower cranes in the trailing section that does not require temporary supports, etc., and requires fewer and smaller lifting machines than when installing them externally. Can handle the construction of large-scale roofs. In addition, the labor required for assembling and dismantling temporary support stands is reduced, and work efficiency is improved by assembling the truss unit in the internal space. It is also possible to add equipment such as catwalks. Based on the above, it is also possible to significantly reduce the overall construction cost.

[Brief explanation of the drawing]

1 to 10 are plan views showing the outline of the construction procedure in an embodiment of the present invention, FIG. 11 is a plan view showing the state of construction of the preceding construction part, FIG. 14 is a plan view showing the construction of the trailing middle truss, FIG. 14 is a longitudinal sectional view thereof, FIG. 15 is a plan view when roof steel frame assembly is completed, and FIG. 16 is a longitudinal sectional view thereof. l...Compression ring, 2...
・Tension ring, 3...Girder, 4...
・・Girder joint part, 5・・・・Previous truss,
6... Trailing middle truss, 7... Truss unit, 8... Top, 9... Central temporary support stand, lO... Intermediate temporary support stand, 11...
... Intermediate temporary support stand, 12 ... Truck crane, 13 ... Truss hoisting frame, 14 ...
Self...Tower crane. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. v59 Fig. 10 Fig. 11 Fig. 14 Fig. 15

Claims (1)

[Claims] (11'* First, assemble the compression ring at the top of the roof and the tension ring at the bottom of the roof, and then assemble a plurality of sets of the preceding construction portion consisting of a pair of girders and a leading middle truss between the girders. A method for assembling a steel frame for a large roof, characterized in that the compression ring and the tension link are erected, and then a trailing middle truss is erected to connect the preceding erected portions. (2) A method of assembling a trailing middle truss A method for assembling a steel frame for a large roof according to claim 1, wherein a part of the truss unit is assembled to the ground and is lifted up to the erection position using a winch.