JP3700101B2 - How to dismantle the dome roof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for disassembling a dome roof in which a central portion of a dome is supported by a tension ring or a lower support structure disposed on the outermost periphery of the dome.
[0002]
[Prior art]
Conventionally, as a method for disassembling a dome roof of a relatively small scale, as shown in FIGS. 2A and 2B, a method of disassembling sequentially from the central portion of the dome roof 1 toward the outer periphery, or FIG. ), As shown in (b), a method of dismantling sequentially from the outer peripheral end of the dome roof 1 in one direction has been proposed.
[0003]
[Problems to be solved by the invention]
By the way, in the case of the above-mentioned conventional dismantling method, if the scale of the dome roof 1 increases, a stress exceeding the design stress may occur in the ring direction of the dome roof 1 as the dismantling progresses. There is a risk of collapsing at the location, and there is a problem in ensuring the safety of workers inside the building. In particular, in the center of the dome roof, the work is to be dismantled at a high place, so that there is a problem that a large heavy machine is required and work efficiency is deteriorated. If the dismantling work is carried out while temporarily supporting the dome roof 1 with the scaffold 2 incorporated in the building, there will be no danger of collapse or safety problems of the operator, but for temporary support. In addition, a huge temporary cost such as a jack or the like is required on the upper part of the scaffold 2. Further, the scaffold 2 is obstructed, and the heavy equipment for dismantling cannot move freely, resulting in poor work efficiency.
[0004]
In view of the above circumstances, an object of the present invention is to provide a method capable of dismantling a dome roof safely and efficiently while suppressing an increase in cost.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a method for disassembling a dome roof in which a central portion of the dome is supported by a tension ring or a lower support composition arranged on the outermost periphery of the dome, and buckling occurs in the structural material toward the center of the dome and the ring. By cutting the tension ring or the lower support structure, or by cutting the member connecting the tension ring or the lower support structure and the center of the dome so that the structural material along the direction is broken. The center of the dome is collapsed by its own weight toward the inside downward, and the collapse process is controlled .
[0006]
In this method, the tension ring or the lower support structure disposed on the outermost periphery of the dome is cut, or the member connecting the tension ring or the lower support structure and the dome center is cut to thereby remove the center part of the dome. Among the constituting frames, 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 significantly increased as a whole. Accordingly, buckling occurs in the structural material toward the center of the dome, and fracture occurs in the structural material in the ring direction, so that the central portion of the dome collapses due to its own weight.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of the appearance of the dome roof 10 and a method for dismantling it. This dome roof 10 has a structure in which a three-dimensional truss dome central portion 12 is supported by a tension ring 11 disposed on the outermost periphery of the dome, and the tension ring 11 and the dome central portion 12 are supported by a member 13 attached to the tension ring 11. Are connected.
[0008]
In disassembling the dome roof 10, in the present invention, as shown in FIGS. 1A and 1B, the outermost tension ring 11 or the member 13 attached to the tension ring 11 is cut (as far as possible in the outermost periphery). The side closer to the part is better). The cut portion is a portion indicated by P1 or P2, for example. As a result, stress exceeding the design stress is generated in the structural material of the dome central portion 12, and the dome central portion 12 is collapsed toward the inside downward by its own weight as shown in FIG.
[0009]
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 among the frames constituting the dome center portion 12 is greatly increased near the outer periphery. In addition, 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 toward the center of the dome, and fracture occurs in the structural material along the ring direction. As a result, the central portion 12 of the dome collapses due to its own weight.
[0010]
Therefore, it is not necessary to disassemble the scaffold inside the dome, or to disassemble the center of the dome using a heavy machine, ensuring safety and improving work efficiency.
[0011]
In the above embodiment, the case of a dome type building having a tension ring on the outermost periphery of the dome has been described. In this case, the present invention can be applied. In that case, the lower support structure or a member connecting the lower support structure and the dome center is cut to collapse the dome center by its own weight. Thereby, there can exist the same effect as the above.
[0012]
The framework structure of the dome roof is not limited to the three-dimensional truss as described above, but may be anything such as a parallel string truss, an RC beam, a laminated material, or the like.
[0013]
【The invention's effect】
As described above, according to the first aspect of the present invention , the tension ring or the lower support structure is configured so that the structural material toward the center of the dome is buckled and the structural material along the ring direction is broken. In order to control the collapse process, the center part of the dome is collapsed by its own weight , by cutting the member connecting the tension ring or the lower support structure and the center part of the dome . Since the work is dismantled from the outer periphery of the building, there is little danger to workers and safety can be improved. In addition, since work at high places can be reduced, temporary costs and the like can be reduced, work by heavy machinery can be minimized, and work efficiency can be improved.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view of a dismantling method according to an embodiment of the present invention, in which (a) is a perspective view showing an appearance and a cut portion of a dome roof to be dismantled, and (b) is a cross-sectional view showing the cut portion. c) is a cross-sectional view showing a state in which the central portion of the dome roof is collapsed by its own weight as a result of cutting.
FIGS. 2A and 2B are explanatory views of a conventional method for dismantling a dome roof, in which FIGS. 2A and 2B are a cross-sectional view and a plan view showing a disassembling procedure; FIG.
FIGS. 3A and 3B are explanatory views of another conventional method for dismantling a dome roof, in which FIGS. 3A and 3B are a cross-sectional view and a plan view showing a dismantling procedure;
[Explanation of symbols]
10 Dome roof 11 Tension ring 12 Dome center part 13 Member P1, P2 cutting point attached to tension ring

Claims (1)

A method for disassembling a dome roof in which a central portion of the dome is supported by a tension ring or a lower support structure disposed on the outermost periphery of the dome,
The tension ring or the lower support structure is cut or the tension ring or the lower support structure is cut so that the structural material toward the center of the dome is buckled and the structural material along the ring direction is broken. A method for disassembling a dome roof, comprising: cutting a member connecting the body and the central portion of the dome to cause the central portion of the dome to collapse by its own weight downward toward the inside and controlling the collapse process .

Images