JP3664815B2 - Roof dome construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method of a roof dome that forms a roof of a covered ball game field, a stadium, a theme park, a multipurpose facility building, or the like.
[0002]
[Prior art]
Conventionally, as a construction method of a roof dome, for example, as shown in FIG. 7, a tension ring 101 for restricting horizontal deformation of the outer peripheral portion, that is, the bottom surface of the roof dome, is erected on the ground level, and then a tower crane, a crawler crane, The roof shell (frame roof truss) 102 is sequentially assembled toward the center, and finally the entire roof dome 100 is assembled, and then the entire frame of the roof dome 100 is lifted by a lift-up machine 103 such as a center hole jack. Some lift up on the surrounding wall 104 of the building.
[0003]
[Problems to be solved by the invention]
However, when the roof dome is constructed by the conventional method, the roof shape is deformed by the weight of the roof, so that not only the axial force but also the bending moment is generated in the roof shell, and the cross-sectional performance required for the roof shell member is large. Become. As a result, there is a problem that the weight of the roof shell member increases, and the construction cost of the entire building increases as well as the roof dome.
[0004]
Also, when trying to suppress the deformation of the roof shape, the conventional construction method requires an increase in the cross-sectional area of the tension ring, which increases the weight of the tension ring. Increase.
[0005]
As the scale of the roof dome increases, the above-described tendency increases because the deformation of the roof shape due to the weight of the roof increases.
[0006]
Then, the objective of this invention is providing the construction method of the roof dome which can aim at the weight reduction of a roof shell by suppressing the cross-sectional performance which a roof shell member requires.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the roof dome construction method according to the present invention includes a tension that restricts horizontal deformation of the bottom surface of the roof dome when a roof dome having a curved shell shape is constructed. Prestress is introduced into the ring by using a cable embedded in the tension ring, and the deformation of the roof dome is suppressed by using the prestressed tension ring.
[0008]
[Action]
According to the construction method of the roof dome according to the present invention, the force generated in the tension ring by the weight of the roof dome is always a tensile force, so that the prestress (compression force) introduced earlier is a part of the tensile force by the own weight. And the tensile force generated in the tension ring can be reduced. For example, as shown in FIG. 5, the reverse bending moment generated by the prestress cancels the bending moment due to the weight of the roof shell, and the bending moment generated in the roof shell can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the construction method of the roof dome according to the present invention will be described in detail with reference to examples.
[0010]
"Example"
FIG. 1 is a plan view of a large roof dome to which the present construction method is applied, FIG. 2 is a sectional side view, FIG. 3 is a sectional view of a tension ring having a tension cable, and FIG.
[0011]
As shown in FIGS. 1 and 2, the main structure responsible for loads in the roof dome is roughly classified into a roof shell 1 and a tension ring 2.
[0012]
As shown in FIG. 3, a plurality of cables 3 for introducing prestress 4 into the tension ring 2 are embedded in the tension ring 2.
[0013]
In this construction method, as shown in FIG. 4, first, the tension ring 2 is assembled on the ground level, and then the roof shell 1 is assembled from the outer peripheral portion toward the central portion in sequence (see erection step 1). This assembly is carried out while measuring each joint position by using construction vents 11 provided at a plurality of locations and heavy machinery such as a truck crane and a crawler crane (not shown), and a roof building material for attaching a roof finishing material is temporarily installed. Keep it fixed. In addition, a suspension scaffold that will be used later when attaching the roof finish is attached.
[0014]
Next, the cable 3 embedded in the tension ring 2 is pulled with a jack, tension is applied to the cable 3, and prestress (compression force) is applied to the tension ring 2. In the process of pre-stressing the tension ring 2, the roof dome is also forced to be deformed. Therefore, it is implemented based on sufficient surveying and accuracy control so that not only the tension ring 2 but also the roof shell member does not generate large local stress. (See erection step 2).
[0015]
As a method of applying prestress to the tension ring 2, there is a method in which prestress is introduced into the tension ring 2 before the roof shell 1 and the tension ring 2 are joined in the erection step 1. In the construction procedure in this case, the roof shell 1 is assembled in the erection step 1 and the roof shell 1 is jacked up in the erection step 2 and then the roof shell 1 and the tension ring 2 are joined. FIG. 6 shows a concept of joining the tension ring 2 by deforming the roof shell 1 by jacking up.
[0016]
After introducing prestress into the tension ring 2, the erection vent 11 is disassembled so that the roof dome itself takes charge of its own weight (see erection step 3). This erection step 3 is also performed based on sufficient surveying and accuracy control so that a large local stress is not generated on the roof shell member during construction.
[0017]
Next, a winch 13 and a pedestal 14 for lifting the entire roof dome are installed on the building peripheral wall 12, and the entire block is lifted and fixed on the building peripheral wall 12 (see erection step 4). The main building is adjusted and fixed after the entire block is lifted to avoid the effects of introducing prestress and reduce the lift-up weight. After the main fixing of the main building is completed, the roof finishing material will be installed.
[0018]
【The invention's effect】
As described above, according to the present invention, the deformation of the roof shape can be suppressed without increasing the cross-sectional area of the tension ring. By suppressing the deformation of the roof, the bending moment generated in the roof shell by the deformation of the roof can be suppressed, and the cross-sectional performance required for the roof shell member can be suppressed. As a result, the weight of the roof shell can be reduced, and the construction cost of the entire building as well as the roof dome can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a roof dome according to an embodiment of the present invention.
FIG. 2 is a side sectional view of the same.
FIG. 3 is a cross-sectional view of a tension ring similarly having a tension cable.
FIG. 4 is an explanatory view showing a construction procedure of a roof dome according to the present invention.
FIG. 5 is a bending moment diagram showing the effect of the present invention.
FIG. 6 is an explanatory diagram of a method for applying a forced deformation to the roof shell by jacking up.
FIG. 7 is an explanatory view showing a conventional construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roof shell 2 Tension ring 3 Cable 11 Construction vent 12 Building surrounding wall 13 Winch 14 Mounting stand

Claims (1)

When constructing a roof dome having a curved shell shape among the roof dome, a prestress is introduced using a cable embedded in the tension ring to a tension ring that restricts horizontal deformation of the bottom surface of the roof dome, A roof dome construction method characterized by suppressing deformation of the roof dome using a pre-stressed tension ring.

Images