JPH1144104A - Demolition method of dome roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To demolish a building from an outer periphery, and improve the working efficiency by collapsing it by dead weight by cutting a tension ring or a lower support structure body or cutting a member to connect it to a dome central part. SOLUTION: A dome roof 10 is formed as a structure to support a three- dimensional truss-made dome central part 12 by a tension ring 11 arranged on the dome outermost periphery, and is formed by connected the tension ring 11 and the dome central part 12 to each other by a member 13. When it is broken up, the member 13 is cut. Cutting is performed in a place P1 or P2, and stress exceeding design stress is generated in a structural material of the dome central part 12, and it is collapsed in the inward direction by dead weight. In the case of a domed building where the dome central part is supported by a lower support structure arranged on the dome outermost periphery, a lower support structure body or the member to connect the lower support structure body and the dome central part is cut. Therefore, a collapsing process can be controlled, and safety can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disassembling a dome roof in which a dome center portion is supported by a tension ring or a lower support structure disposed on the outermost periphery of the dome.

[0002]

2. Description of the Related Art Conventionally, as a method of disassembling a dome roof of a relatively small scale, as shown in FIGS. As shown in FIGS. 3 (a) and 3 (b), a method of sequentially dismantling the dome roof 1 in one direction from the outer peripheral end thereof has been proposed.

[0003]

By the way, in the case of the above-mentioned conventional dismantling method, when the scale of the dome roof 1 becomes large,
As the disassembly progresses, stress exceeding the design stress may be generated in the ring direction of the dome roof 1, and there is a danger of collapse at unexpected places, and there is a problem in securing the safety of workers inside the building. There is. In addition, especially in the center of the dome roof, since the dismantling work is performed at a high place, there is a problem that a large heavy machine is required and work efficiency is deteriorated. In addition, if the demolition work is performed while temporarily supporting the dome roof 1 with the scaffold 2 incorporated in the building, there is no danger of collapse or a problem of worker safety. ,
Huge temporary costs are required, such as the need for jacks and the like above the scaffold 2. In addition, the scaffold 2 hinders the dismantling heavy equipment from freely moving, resulting in poor work efficiency.

An object of the present invention is to provide a method for safely and efficiently dismantling a dome roof while suppressing an increase in cost in consideration of the above circumstances.

[0005]

The invention of claim 1 is a method of disassembling a dome roof in which a dome center portion is supported by a tension ring or a lower support structure disposed at an outermost periphery of the dome, wherein the tension ring or the lower portion is provided. By cutting the support structure or cutting the member connecting the tension ring or the lower support structure to the dome center, the center of the dome is collapsed by its own weight.

In this method, the dome is cut by cutting a tension ring or a lower support structure disposed at the outermost periphery of the dome, or by cutting a member connecting the tension ring or the lower support structure to the center of the dome. Among the frames constituting the central portion, the bending moment of the structural material in the meridian direction is greatly increased near the outer periphery, and the axial force (tensile force) of the structural material in the ring direction is largely increased as a whole. Therefore, buckling occurs in the structural material toward the center of the dome, and breakage occurs in the structural material in the ring direction, so that the central portion of the dome collapses under its own weight.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the appearance of a dome roof 10 and a method of disassembling the same. The dome roof 10 has a structure in which a dome central portion 12 made of a three-dimensional truss structure is supported by a tension ring 11 arranged on the outermost periphery of the dome, and the tension ring 11 and the dome central portion 12 And are connected.

In disassembling the dome roof 10, according to the present invention, as shown in FIGS. 1 (a) and 1 (b), the outermost tension ring 11 or a member 13 attached to the tension ring 11 is cut ( The side that is as close to the outermost periphery as possible is better). The cut portion is, for example, a portion indicated by P1 or P2. As a result, a stress exceeding the design stress is generated in the structural material of the dome central portion 12, and as shown in FIG. 1C, the dome central portion 12 is collapsed downward by its own weight.

In this case, by cutting the tension ring 11 or the member 13 attached to the tension ring 11,
The bending moment of the structural material in the meridian direction in the frame constituting the dome center portion 12 is greatly increased near the outer periphery. Further, the axial force (tensile force) of the structural material in the ring direction is greatly increased as a whole. Therefore, buckling occurs in the structural material heading toward the center of the dome, and breakage occurs in the structural material along the ring direction. As a result, the dome central portion 12 collapses under its own weight.

Accordingly, it is not necessary to disassemble the dome by assembling a scaffold inside the dome or to dismantle the center of the dome by using a heavy machine, thereby ensuring safety and improving work efficiency.

In the above embodiment, the case of a dome-shaped building having a tension ring at the outermost periphery of the dome has been described. The present invention can be applied to a dome-shaped building. In that case, the lower support structure or a member connecting the lower support structure and the dome center is cut, and the dome center is collapsed by its own weight. Thereby, the same operation and effect as described above can be obtained.

Further, the frame structure of the dome roof is not limited to the three-dimensional truss as described above, but may be any structure such as a parallel string truss, an RC beam, a laminated wood or the like.

[0013]

As described above, according to the first aspect of the present invention, a member for cutting the tension ring or the lower support structure or connecting the tension ring or the lower support structure to the center of the dome. , The center of the dome is collapsed by its own weight, so that the collapse process can be controlled by intentionally cutting. In particular, since the dismantling operation is performed from the outer periphery of the building, there is little danger to workers, and safety can be improved. Further, since work at high places can be reduced, temporary costs and the like can be reduced, and work by heavy equipment can be minimized, thereby improving work efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a disassembly method according to an embodiment of the present invention;
(A) is a perspective view showing an appearance of the dome roof to be dismantled and a cut portion, (b) is a sectional view showing the cut portion,
(C) is a sectional view showing a state in which the center of the dome roof has collapsed by its own weight as a result of cutting.

FIG. 2 is an explanatory view of a conventional dome roof disassembly method.
(A), (b) is sectional drawing and a top view which show the procedure of disassembly.

FIG. 3 is an explanatory view of another conventional method of disassembling a dome roof, where (a) and (b) are a cross-sectional view and a plan view showing the procedure of disassembly.

[Explanation of symbols]

 Reference Signs List 10 Dome roof 11 Tension ring 12 Dome center 13 Member attached to tension ring P1, P2 Cutting location

Claims (1)

[Claims] 1. A method of disassembling a dome roof in which a center portion of a dome is supported by a tension ring or a lower support structure disposed on an outermost periphery of the dome, wherein the tension ring or the lower support structure is cut or A method of disassembling a dome roof, comprising cutting a member connecting a tension ring or a lower support structure and a dome center to collapse the dome center by its own weight.