JPH1018496A - Method of construction of roof dome - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a roof shell by restricting sectional performance required in a roof shell member by introducing prestress to a tenstion ring by using a cable. SOLUTION: When a roof dome, in which a roof shape is formed in a curved- surface shell shape, is built, tension rings 2 are assembled at a ground level first. A roof shell 1 is assembled by utilizing erection bends 11 installed at a plurality of places. Cables 3 buried in the tension rings 2 are drawn by jacks, the cables 3 are given tension, and prestress is introduced to the tension rings 2 limiting the horizontal direction of the base of the roof dome. The erection bends 11 are disassembled, and its own weight is bone to roof dome itself. Winches 13 and cradles 14 are installed, and the whole blocks are hung up and fixed onto a building peripheral wall 12. Accordingly, the deformation of the roof dome is inhibited and the roof dome can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a covered ball field,
The present invention relates to a construction method of a roof dome forming a roof of a stadium, a theme park, a multipurpose facility building, and the like.

[0002]

2. Description of the Related Art Conventionally, as a construction method of a roof dome,
For example, as shown in FIG. 7, a tension ring 101 for limiting the horizontal deformation of the outer peripheral portion, that is, the bottom surface of the roof dome, is erected at the ground level, and then a roof shell (framed roof truss) 102 is formed using a tower crane, a crawler crane, or the like.
Are sequentially assembled toward the center, and finally the entire roof dome 100 is assembled.
Is lifted up on a building peripheral wall 104 by a lift-up machine 103 such as a center hole jack.

[0003]

However, when a roof dome is constructed by a conventional method, the roof shape is deformed by the weight of the roof, so that not only an axial force but also a bending moment is generated in the roof shell, and the roof shell is constructed. The cross-sectional performance required by the member increases. As a result, there is a problem that the weight of the roof shell member increases, and the construction cost of the entire building as well as the roof dome increases.

In order to suppress the deformation of the roof shape, the conventional method requires an increase in the cross-sectional area of the tension ring, which increases the weight of the tension ring. Construction costs will increase.

[0005] The larger the size of the roof dome, the greater the deformation of the roof shape due to its own weight, so the above tendency becomes greater.

Accordingly, an object of the present invention is to provide a method of constructing a roof dome capable of suppressing the cross-sectional performance required of a roof shell member and reducing the weight of the roof shell.

[0007]

In order to achieve the above object, a method of constructing a roof dome according to the present invention is a method of constructing a roof dome having a curved shell shape in a roof dome. Prestress is introduced using a cable to a tension ring that limits horizontal deformation of the bottom surface, and deformation of the roof dome is suppressed using a tension ring into which the prestress is introduced.

According to the roof dome construction method of the present invention, the force generated on the tension ring due to the weight of the roof dome is always a tensile force. A part of the tensile force generated by the tension ring can be offset, 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 own weight of the roof shell, and the bending moment generated in the roof shell can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction method of a roof dome according to the present invention will be described below in detail with reference to embodiments.

FIG. 1 is a plan view of a large roof dome to which the present construction method is applied, FIG. 2 is a side sectional view of the same, and FIG.
FIG. 4 is a sectional view of a tension ring having a tension cable, and FIG.

As shown in FIGS. 1 and 2, the main structure that bears a load in a roof dome is roughly classified into a roof shell 1 and a tension ring 2.

FIG. 3 shows the inside of the tension ring 2.
As shown in FIG. 1, a plurality of cables 3 for introducing the prestress 4 into the tension ring 2 are buried.

In this construction method, as shown in FIG. 4, a tension ring 2 is first assembled at a ground level, and then a roof shell 1 is sequentially assembled from an outer peripheral portion to a central portion (see erection step 1). This assembling is performed while measuring the positions of the joints by using erection vents 11 provided at a plurality of locations and heavy equipment such as a truck crane and a crawler crane (not shown). Keep it fixed. In addition, suspending scaffolds will be installed which will be used later when installing roofing materials.

Next, the cable 3 embedded in the tension ring 2 is pulled with a jack to apply tension to the cable 3 and to apply a prestress (compression force) to the tension ring 2. Since the process of applying prestress to the tension ring 2 is also to apply forced deformation to the roof dome,
It is carried out based on sufficient surveying and quality control so that a large local stress is not generated not only in the tension ring 2 but also in the roof shell member (see erection step 2).

As a construction method for prestressing the tension ring 2, in the erection step 1, the roof shell 1
There is also a method of introducing a prestress into the tension ring 2 before joining the tension ring 2 with the tension ring 2. The construction procedure in this case is as follows.
After the roof shell 1 is jacked up in the erection step 2, the roof shell 1 and the tension ring 2 are joined. FIG. 6 shows a concept in which the roof shell 1 is deformed by jacking up and joined to the tension ring 2.

After the prestress is introduced into the tension ring 2, the erection vent 11 is disassembled so that the roof dome itself takes on 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 does not occur in the roof shell member during construction.

Next, a winch 13 and a gantry 14 for lifting up the entire roof dome are installed on the building peripheral wall 12, and the entire block is lifted up and fixed on the building peripheral wall 12 (see erection step 4). Adjustment of the purlin and permanent fixing are performed after the entire block has been lifted up in order to avoid the effects of the introduction of prestress and reduce the weight of the lift up. After the permanent fixing of the purlin material is completed, the roof finishing material will be erected.

[0018]

As described above, according to the present invention, it is possible to suppress the deformation of the roof shape without increasing the sectional area of the tension ring. By suppressing the deformation of the roof, the bending moment generated in the roof shell due to the deformation of the roof can be suppressed, and the required cross-sectional performance of 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 sectional view of a tension ring 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 of forcibly deforming a 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 peripheral wall 13 Winch 14 Stand

Claims (1)

[Claims] When constructing a roof dome having a curved shell shape, a prestress is introduced using a cable to a tension ring for limiting horizontal deformation of the bottom surface of the roof dome. A roof dome construction method characterized by suppressing the deformation of the roof dome using a tension ring with stress.