JPS5833341B2 - Dome construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of constructing a dome roof that is applied to baseball stadiums, gymnasiums, assembly halls, and other large spaces.

Conventionally, the most common method for constructing this type of roof structure is to provide temporary scaffolding over the entire area directly under the roof, and then assemble the roof structure thereon.

However, this method not only requires a large amount of money for temporary scaffolding, but also requires work at a high place to assemble the roof, so it cannot be said to be a desirable method in terms of construction accuracy, work safety, and efficiency.

Instead of the full-scale scaffolding described above, a method has also been adopted in which temporary steel towers are placed at several locations directly beneath the dome, and blocks of dome components that have been partially assembled on the ground are supported and assembled on the tops of these temporary steel towers. However, this method also has the same disadvantages as the above-mentioned method, although there are differences in degree.

The present invention has been proposed in view of the above-mentioned circumstances. When constructing a dome frame structure having a spherical or similar polyhedral shape whose periphery is supported by a substructure, it is possible to The peripheral part of the dome, which is made by suspending the installation of the upper circumferential member and having hinges interposed at the nodes, is installed on the lower structure, and the central part of the dome is placed at a level close to the ground directly below the installation position. The dome construction method is characterized in that the dome is assembled and joined to the peripheral part of the dome, and then the entire dome is lifted up and after each part of the dome reaches a predetermined position, the retaining circumferential member is additionally joined. The purpose of this is to assemble most of the dome components at a level close to ground level, which will significantly reduce the amount of temporary construction materials and improve construction accuracy.
The object of the present invention is to provide an improved dome construction method that can improve not only work safety but also work efficiency.

The present invention will be described below with reference to Examples.

A is the central part of the dome, and B is the peripheral part of the dome supported by the peripheral substructure C. As shown in FIG. 1, the frameworks of both parts A and B are assembled and connected at a level close to the ground.

At this time, when assembling the frame around the dome periphery B, the attachment of the circumferential member 1 in the same plane near the periphery is suspended.

The dome frame constructed in this manner becomes a geometrically unstable frame.

In other words, the geometric shape of the dome can be freely changed as shown in FIGS. 1, 2, or 3 without changing the dimensions of the dome member.

At the same time, in order to enable movement of the dome due to the above-mentioned geometrically unstable frame, relative members such as those shown in FIGS. 5 and 6 are attached to the nodes 2, 3. A hinge is provided to allow rotation.

Therefore, during the assembly stage of the dome of the illustrated embodiment, the outermost node 4 of the dome periphery B remains supported at a predetermined position on the substructure C, as shown in FIG. 1, and the dimensions of the dome member are changed. The dome central part A can be assembled at a level close to the ground directly below its regular installation position without any trouble.

In this case, as is clear from a comparison with FIG. 3, the need for temporary scaffolding can be significantly reduced compared to the case where the final shape of the dome is constructed directly from scratch.

Furthermore, since the work is carried out at a level close to the ground level, construction accuracy, work safety, and efficiency are improved.

The dome assembled at a level close to the ground as described above is lifted up, passes through the state shown in Fig. 2, and assumes the final shape shown in Fig. 3, and at this stage the previously reserved circle is lifted up. A stable dome framework is completed by additionally joining the circumferential members 1 at predetermined positions, and in this embodiment, a pneumatic method is adopted as the method for raising the dome.

That is, as shown in Fig. 2, a blower (
(not shown) is used to introduce air to raise the air pressure inside the dome above the outside air pressure, and this pressure difference causes the dome to rise.

In this case, a considerable degree of airtightness is required on the dome surface in order to secure the pressure difference necessary for the dome to rise.
The triangular panels with vertices at , as well as the triangular panels with nodes 4 and 3°4 as vertices, do not change shape during the upward movement of the dome, so these parts can be removed by completing the roof finishing before air is introduced. No special airtight measures are required.

However, the quadrilateral whose apex is node 2°3.4.3 changes its shape significantly during the upward movement of the dome, so
This area is covered with a temporary canvas membrane to ensure airtightness.

When lifting the dome, several adjustment cables 6 are stretched in symmetrical positions between the node 2 and the ground, and by adjusting the cables 6 with a winch, the speed of the dome's rise and its shape during the rise can be adjusted. can be controlled.

It is also one of the features of the present invention that the movement of the dome during rising can be easily controlled in this way.

7 and 8 show another embodiment of the present invention, in which the dome periphery B in the embodiment is divided into an inner periphery B1 and an outer periphery B2.
Divide into two parts, and each part B1. The dome is assembled in the same steps as in the previous embodiment except that the mounting of the circumferential members 1, 1 in the same plane at B2 is suspended.

In this way, the assembly work of the central part of the dome can be carried out at a level closer to the ground than in the previous embodiment, thereby further reducing the need for temporary scaffolding and significantly shortening the construction period.

In the drawings, parts equivalent to those of the above embodiment are designated by the same reference numerals.

9 and 10 show an embodiment in which the present invention is applied to the construction of a Shvedler type dome. When assembling the dome, every one of the circumferential members connecting the nodes 3 in the dome periphery B is The installation of the member 1 is suspended, and the same method as in the conventional lift-up method is adopted as a method for lifting the dome formed at a level near the ground.

That is, a method is used in which a hoisting device 8 whose main engine is a center hole jack is installed at the top of a temporary steel tower 7 arranged at a symmetrical position, and the node 2 is hoisted up by a hanging member 9 to raise the dome.

In the drawings, parts equivalent to those of the above embodiments are designated by the same reference numerals.

Although the above embodiment shows the case where the substructure C supporting the dome is the foundation, the substructure C may be a series of pillars or a wall, and may also be a structure such as a stadium seating structure. It may be something.

Further, the nodes 4 around the dome do not necessarily have to be on a horizontal plane, but may be on a slope.

In this invention, as mentioned above, the mounting of the circumferential members on the same plane near the periphery of the dome is suspended, and the hinges are interposed at the nodes.
Utilizing the geometrically unstable bridge of the entire dome, which consists of the peripheral part of the dome and the central part of the dome that is assembled directly under the dome and connected to the peripheral part of the dome, the entire dome can be built at a level near the ground. Once assembled, it can be lifted up.

Further, after the dome is raised to a predetermined position, the retaining circumferential member is additionally joined to complete the dome, so that additional work for stabilizing the dome after being raised can be minimized.

Furthermore, when the dome is raised, as mentioned above, the ascending movement of the dome can be controlled by interposing an adjustment cable between the node between the center of the dome and the periphery of the dome and the ground, and adjusting the cable. is easily performed.

As described above, the method of the present invention has many advantages over conventional dome construction methods in terms of economy, construction accuracy, work safety, and work efficiency.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

1 to 3 are longitudinal cross-sectional views showing the steps of an embodiment of the dome construction method according to the present invention, FIG. 4 is a plan view of FIG. 3, and FIGS. 5 and 6 respectively show the peripheral dome portion. FIGS. 7 and 8 are plan views in longitudinal section showing the hinge portion of the invention, FIGS. 7 and 8 are plan views in longitudinal section showing the state of implementation of other embodiments of the method of the present invention, and FIGS. 9 and 10 are FIG. 6 is a longitudinal sectional view and a plan view showing the implementation status of further embodiments of the method of the present invention, respectively; A... Central part of the dome, B... Peripheral part of the dome, 1... Circumferential member, 2, 3.4...
···node.

Claims (1)

[Claims] 1. When constructing a dome frame structure having a spherical or similar polyhedral shape whose periphery is supported by a substructure, the installation of circumferential members on the same plane near the periphery of the dome is suspended, and hinges are not installed at the nodes. The surrounding part of the dome formed by the interposition is installed on the lower structure, and the central part of the dome is assembled at a level close to the ground directly below the installation position and joined to the surrounding part of the dome, and then the entire dome is lifted up. After each part of the dome reaches a predetermined position, the retaining circumferential member is additionally joined.