JPH0460038A - Constructing method of large span dome roof - Google Patents

Abstract

PURPOSE:To improve the workability and safety by assembling unit frames on both sides of a constructing tower on the ground, raising up the unit frames by wires, and lifting a frame material between adjacent unit frames by a cable crane. CONSTITUTION:Unit frames F are assembled on the ground successively from the side closer to constructing towers T, and raised up by hoisting devices 1 every completion of the assembling. Both ends situated on the outer circumference of a doom roof D are rotatably supported by anchors 3 on the ground, and a wire 4 is flatly erected between the middle part of the unit frame F and the hoisting device 1 of each constructing tower T in the direction orthogonal to the arrangement direction of the constructing tower T. The wire 4 is hoisted by the hoisting device 1, whereby, the unit frame F is successively raised up from the construction tower T side. A frame member 2 is lifted by a cable crane suspended between the constructing tower T and a cable tower.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of constructing a large-span dome roof, which is constructed by assembling most of the large-span dome roof on the ground and then standing it upright. . The applicant has previously filed an application for a method of constructing a dome roof in this manner (Japanese Patent Application No. 132815/1999), and the present invention is a further development of the aforementioned invention.

[Prior Art and Problems to be Solved by the Invention] Conventionally, in the construction of a large span dome roof, after erecting the main frame, the single members constituting the trusses etc. were successively connected to this frame,
Alternatively, the common method is to incorporate a frame made of a single piece of material that has been made into units of a certain size in advance, but these methods all rely on work at heights and require a lot of scaffolding and shoring from the ground. This requires installation, which is difficult to construct, and also poses a safety problem.

Therefore, recently, dome roofs are constructed by, for example, constructing a central frame and a ring-shaped frame around the outer periphery, assembling most of the parts on the ground, and then jacking up both frames with the two frames connected. Methods have been developed to solve the above conventional problems.

However, with the method of jacking up, the vertical load of the roof must be borne when the dome is lifted, so if the long diameter of the dome is several hundred meters long, the lifting equipment and its ancillary equipment, including the jacking, must be large-scale. This would lead to a huge increase in construction costs.

This invention was made based on the actual situation of the conventional construction method, and particularly aims to propose a new construction method that overcomes the problems with the lifting device.

[Means to solve the problem]

In the present invention, a plurality of construction towers are erected on a line passing through the center of the dome roof to be constructed, and arch-shaped unit frames forming part of the dome roof are assembled on the ground on both sides. The load on the lifting equipment is reduced by winding up the wire stretched between the construction tower and the intermediate part of the unit frame, with both ends of the unit rotatably supported on the ground. We aim to downsize it.

When raising a unit frame, the vertical load is supported on the ground, so the lifting device only needs to have the ability to raise the unit frame against the moment, and it is possible to raise the unit frame while supporting the entire weight. This means that a smaller lifting device is sufficient for lifting equipment used for jacking up.

The structure between adjacent unit frames caused by the winding of the wire is stretched between a cable tower that is movable in the circumferential direction around the outer periphery of the dome roof and a construction tower in the center. It is constructed by hoisting frame materials using a cable crane suspended from cables and connecting both ends to the unit frames, thereby making all the unit frames continuous and forming a dome roof.

Inside the dome roof, a movable scaffold was assembled in a semi-arch shape between the construction tower located at the center and the outer periphery of the dome roof using a cable crane, allowing it to pivot freely around the construction tower. Final tightening of bolts between frame members is performed on the movable scaffold.

Cable cranes are also used to install roofing material on dome roofs.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

This invention is a dome shop constructed as shown in FIG.
Using the construction tower T, which is temporarily constructed on a line passing through the center of
This is a method of constructing a dome roof by erecting the frame material 2 between F using a cable crane 5 as shown in FIG.

As shown in Figure 1-■, multiple construction towers T are erected at appropriate intervals in the long axis (diameter) direction of the dome roof, and their height is larger than that of the dome, and the shape and shape of the dome are larger than that of the dome. Each height is given depending on the slope.

Lifting devices 1, 1 such as winches are installed on both sides of the top of the construction tower T for raising the unit frames F, F.

The cable crane 5 is stretched between a cable tower 6 which is erected on the outer periphery of the dome roof so as to be movable in the circumferential direction, and the top of the construction tower T in the center, as shown in Fig. 3-1~■. It is suspended from the cable 7 to be hung.

In order to cover the entire surface of the dome roof, the cable tower 6 rests on tower rails 8 laid around the outer periphery of the dome roof, as shown in FIG.
Cable tower 6 and construction tower T
It will be constructed between the tops of the

The unit frame F is made up of frame members 2 that are installed parallel to each other in the longitudinal direction in a plane as shown by the partial hatching in Fig. 1-■.
．． A belt-shaped frame divided by 2 is divided into sections, for example, every other section, and is assembled in an arch shape with frame members 2 to form a truss in a lying state as it is from the erected state.

The unit frames F are sequentially assembled on the ground starting from the side closest to the construction tower T, and each time the assembly is completed, they are lifted up by the lifting device I.

Both ends of the assembled unit frame F located on the outer periphery of the dome roof are rotatably supported on the ground, for example, by anchors 3, as shown in Figure 2, while the middle part of the unit frame F and each A wire 4 is installed between the construction tower T and the lifting device l.

The wire 4 is installed in a direction perpendicular to the arrangement direction of the construction towers T in a plane.

Thereafter, by hoisting the wire 4 using the lifting device 1, the unit frames F are successively raised from the construction tower T side.

This raising work can be done independently for the unit frames F and F on both sides of the construction tower T, but in order to do it while maintaining balance without applying any overturning moment to the construction tower T, it is necessary to do it as shown in the diagram. Unit frame F on both sides like this
, F are preferably caused simultaneously.

The structure between unit frames F and F that stand up and are parallel is shown in Figure 3-■
As shown in ~ ■, a certain section of the same frame material 2 as the unit frame F is assembled into a unit, and the cable crane 5 lifts it up and places it in a predetermined position, and connects it to the unit frames F and F. As shown in FIG. 2, the unit frames F and F are continuous.

Fig. 3 shows a method of connecting each unit frame F by lifting the frame material 2 between them each time the unit frame F is raised.
The frame material 2 can be connected between the unit frames F and F after all the unit frames F have been raised.

The connection between the frame material 2 of the unit frame F and the frame material 2 lifted by the cable crane 5, that is, the final tightening of the bolts, is performed inside the dome building IID as shown in Figure 3-■. This is done using a movable scaffold 9 assembled between the tower T and the outer periphery of the dome roof.

Finishing work such as painting the frame material 2 is also performed on the movable scaffold 9.

As shown in FIG. 4, like the cable tower 6, the movable scaffold 9 rests on scaffolding rails 10 laid along the periphery of the dome roof, and is able to pivot freely around the construction tower T. As shown in Figure 2, it is assembled into a semi-arch shape using a cable crane 5. The center side of the movable scaffold 9 is placed on a pedestal 11 projecting from the middle part of the construction tower T.

When the movable scaffold 9 is erected, the construction tower T other than the central part is removed because it is necessary to avoid collisions when the movable scaffold 9 turns.

After the on-site joining of the frame materials 2.2 is completed, that is, after the construction of the dome roof is completed, the roofing material 1 is placed on the dome roof using a cable crane 5, as shown in Fig. 3-■.
2 will be roofed.

After the roofing is completed, the cable tower 6 and movable scaffolding 9 are removed and the entire construction of the dome roofing is completed.

〔Effect of the invention〕

This invention is as described above, and by assembling a unit frame in the form of a dome roof divided into a plurality of arches on the ground, and raising it using a construction tower temporarily installed in the center of the dome roof, a dome can be built. Since it is used to construct a roof, much of the frame is assembled on the ground, making it easy to construct and safe.

In addition, since the unit frame is brought into the specified erection state simply by being raised, the lifting equipment does not require a large capacity from the assembled state to the erected state, allowing the lifting equipment and its ancillary equipment to be made smaller. Therefore, it is possible to reduce construction costs.

[Brief explanation of the drawing]

Figure 1-1 is a plan view showing an example of the construction of a dome roof, ■ is a sectional view passing through its center, Figure 2 is a perspective view, and Figure 3-
(1) to (2) are elevational views showing the construction procedure of the present invention, and Fig. 4 is a plan view showing the arrangement of the cable crane and movable scaffolding. D...Dome roof, T...Construction tower, F...Unit frame, l...Lifting device, 2...Frame Material, 3... Anchor, 4... Wire, 5... Cable crane, 6... Cable tower, 7...
Cable, 8...Tower rail, 9...
...Movable scaffolding, 10...Scaffolding rail, 11.
... Frame, 12... Roofing material.

Claims (3)

[Claims] (1) A method of constructing a large-span dome roof using multiple construction towers erected on a line passing through the center of the dome roof, and an arch that forms part of the dome roof. A unit frame of the shape is assembled on the ground on both sides of the construction tower, and with both ends of the unit frame rotatably supported on the ground side, a wire is stretched between the middle part of the unit frame and the construction tower. While winding up the unit frame, the cables stretched between the cable tower, which is movable in the circumferential direction on the outer periphery of the dome roof, and the construction tower located at the center of the dome roof. A method of constructing a large-span dome roof in which a suspended cable crane lifts the frame material between adjacent unit frames, connects it to both unit frames, and connects the adjacent unit frames to create a dome roof. (2) Using a cable crane, a movable scaffold was installed inside the dome roof, between the construction tower located at the center and the outer periphery of the dome roof, in order to fully tighten the bolts between the frame materials. 2. The method of constructing a large span dome roof according to claim 1, wherein the roof is assembled in a semi-arch shape so as to be freely pivotable about the axis. (3) The method for constructing a large span dome roof according to claim 1, characterized in that the roofing material is placed on the dome roof using a cable crane.