JPH0218196Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention Industrial application field This invention relates to an air membrane structure using a metal membrane.

Conventional technology Conventionally, air membrane structures have been used as large roof structures for large-space structures such as baseball stadiums, and metal membranes have also been used. The gaps between the panels are connected by expansion joints so that when the room is pressurized, each expansion joint extends to transfer stress, and the segments overlap the ends of several panels. It was necessary to weld them together from both sides and cut them in advance so that they would form a three-dimensional curved surface when the room was pressurized. In addition, the construction involved laying out segments made of metal membranes on a flat scaffold, connecting these segments to each other with expansion joints, and then applying pressure inside the room to form a curved surface with concave and convex upwards.

Problems that the invention aims to solve As mentioned above, conventional metal membrane structures require expansion joints with a special structure that can expand and contract between each segment in order to expand a flat object into a spherical shape. Since this joint needs to be able to transmit stress in an extended state, manufacturing an expansion joint requires advanced technology and is expensive.

In addition, multiple panels must be welded to form each segment, but the method of overlapping the ends and welding from both sides has many problems because one side is welded upwards, and it is difficult to obtain a reliable weld surface. In addition to requiring the development of special welding equipment, it is also necessary to cut each segment in advance so that it becomes a three-dimensional curved surface when the room is pressurized. It also had a major drawback: it required a lot of effort.

Furthermore, since the scaffolding is built to the same position as the top of the compression material and the work is done there, it takes a lot of effort to remove the scaffolding, and only low-rise structures can be constructed to ensure the required height. This also had a major disadvantage in that the compression material had to be installed at a higher position, making it more expensive.

This idea eliminates some of the drawbacks mentioned above, and can form a stable three-dimensional curved surface with an upward convexity by simply pressurizing the room without the need for special expansion joints. The purpose is to provide an air membrane structure using a membrane.

(b) Structure of the invention Means for solving the problem A plurality of segments consisting of a large number of ribbed metal panels with an approximately circular segment made of a metal film arranged in the center and the tips of adjacent ribs welded to each other, The outer periphery of the circular segment and the compression material are arranged with an appropriate gap in the radial direction, and one end of the circular segment is fixed to the compression material, and the other end is fixed to the compression material. This is an air membrane structure made of a metal membrane, which is characterized by covering the segments with a soft thin film material.

Effect By fixing the outer periphery of the circular segment to one narrow end of the segment and fixing the other wide end to the compression material, stress is generated only in the radial direction, so the gap between each segment is made of a thin film material. Construction is easy as it only needs to be covered.

In addition, each panel that makes up a segment has ribs in the longitudinal direction, and the ends of the ribs are continuously welded by a machine, so a reliable welding surface can be obtained, and if necessary, the lower part of the welded part of the rib can be expanded, making it possible to create a three-dimensional tree. A stable three-dimensional curved surface can be obtained when the room is pressurized without the need for cutting.

Furthermore, the outer circumference of the circular segment was fixed to the narrow end of the segment, the wide end of the segment was fixed to the compression material, and gaps were provided at appropriate intervals between each segment, so that the circular axial force member part was allowed to hang down. Since the segments can be constructed in the same state, it is possible to lengthen the length of the segments, and when pressurizing the room, the gap between the segments narrows once in the center, but since they are covered with a soft thin film material, they do not come into contact and are smooth. It is possible to obtain the desired rise from the outer circumference.

Embodiments Hereinafter, preferred embodiments of this invention will be described in detail with reference to the accompanying drawings.

The drawing shows an example of an air membrane structure made of a metal membrane according to this invention.

FIG. 1 is a plan view of a structure constructed using this invention, and FIG. 2 is a perspective view showing the entire structure.

1 is a substantially circular segment made of a metal film provided at the center, and 2 is a metal film segment disposed around it. This segment 2 has a gap 6 at an appropriate distance between adjacent segments 2, 2, the outer periphery of the circular segment 1 and one narrow end of the segment 2 are fixed, and the other wide end is covered with compression material 4. The length of the segment 2 is such that the necessary rise can be obtained, and the gap 6 between the segments 2 is covered with a thin film material 5 to prevent pressurized air from leaking. There is.

The metal film constituting each segment 1 and 2 described above is made of stainless steel with a diameter of about 100 m and a thickness of about 1.6 mm, depending on the scale of the structure, and a thin film used in the gap 6 between each segment 2. Material 5 is a non-structural material with a thickness coated with fluorocarbon resin.
It is made of glass fiber cloth, etc., about 0.8 mm.

Each segment 2 is made up of a plurality of metal panels 3, as shown in FIGS. 5a and 5b, and the joint method is to provide ribs 7 at both longitudinal ends of the metal panels 3, which are carried in a roll. The length of this rib 7 (dep+h) depends on the size of the structure, but is usually about 5 to 10 cm.The ends of each rib 7 of the adjacent metal panels 3, 3 are fixed by welding, and one sheet constitutes segment 2 of For welding at this time, a welding machine that can perform spot welding by narrowing the ends of the two ribs 7 from both sides has already been developed, so if this welding machine is used, a reliable welded part 8 can be obtained. can.

In this way, each segment 2 is fixed by welding the tips of the ribs 7 of the metal panel 3 with a plurality of ribs 7, so that when internal pressure is applied, the welded part 8 below is fixed as shown in Fig. 5c. Since the ribs 7 open and a necessary and stable three-dimensional curved surface is obtained, the segment 2 before construction can be in the form of a flat plate, and since the necessary three-dimensional curved surface is formed by pressurizing the room, the segment 2 itself can be made three-dimensional. Not only does it not require cutting trees, but it is also easy to construct.

As described above, in the air film structure using the metal film according to this invention, the outer periphery of the circular segment 1 and one narrow end of each segment 2 are fixed, and the compression material 4 is fixed to the other wide end. Since stress is generated only in the radial direction, a non-structural thin film material 5 can be used for the gaps 6 between the segments 2, 2, and the structure should be such that air does not leak when the room is pressurized. That's fine.

Next, the construction method will be explained with reference to FIG.

First, the segments 2 are manufactured by welding the tips of the ribs 7, 7 of each metal panel 3. Then, one narrow end of the circular segment 1 and each segment 2 is fixed, and then the other wide end is fixed to the compression material 4.
sticks to. At this time, adjacent segments 2, 2
An appropriate gap 6 is provided between them. Further, the length of the segment 2 is set to a length sufficient to obtain the necessary rise, and the segment 2 is constructed so as to hang down from the compression material 4. Then, the gaps 6 between the segments 2, 2 may be covered with the thin film material 5.

Once a completely sealed large roof is obtained in this way, the indoor air is pressurized. The air pressure inside the room is raised to 2 to 2.5 millibars above the outside pressure.
When pressurization begins, the large roof of the metal membrane first lifts up from the side closest to the compression material 4, as shown by the broken line in Figure 3, and the central part is still hanging down. Segment 2 changes as shown by the dotted line. In such a state, the gap 6 between each segment 2 becomes narrower at the central portion in the length direction of the segment 2, but
At this time, it is necessary to provide a gap 6 to the extent that the adjacent segments 2 do not come into contact with each other. Moreover, if the rise of the large roof increases enough to obtain a stable three-dimensional curved surface by applying pressure, the gaps 6 will return to the spacing between the gaps 6 before construction.

In this way, the width of the gap 6 changes during construction, but since the gap 6 is covered with the thin film material 5, it is possible to follow the change in the width of the gap 6 during construction, and when a three-dimensional curved surface is obtained, the width of the gap 6 is almost the same. As a result, the thin film material 5 is also accommodated almost flatly.

In addition, this axial force member 2 is long, so it is 5 to 10 cm.
Even if the metal panel 3 is made of a metal panel 3 with ribs 7, there is no problem because the surface becomes a large curve when pressurization starts as shown in FIG.

Finally, each segment 2 is a metal panel 3
Since the ribs 7 in the necessary portions are opened as necessary to form a three-dimensional curved surface, a stable air film structure can be obtained.

C. Effect of the invention As described above, the air membrane structure using the metal film according to this invention fixes the circular segments and each segment,
Since the segments and compression material are fixed together, stress is generated only in the radial direction, so it is sufficient to create a gap between each segment and cover it with a soft thin film material, and it can easily follow changes in the gap during construction, making it easy to lift. In addition, each segment can be welded using a reliable welding method at the tip of the rib of the ribbed metal panel, and when pressure is applied, the lower end of the rib can be opened as much as necessary to create a three-dimensional curved surface. There is no need to perform three-dimensional cutting in advance, and construction can be done while hanging from the compression material, so the length of the segment can be adjusted to the required length, making it possible to obtain a large roof with the desired rise. Since the temporary scaffolding can also be of low construction, many advantages can be obtained, such as cost reduction.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a plan view of the large roof, Fig. 2 is a perspective view of the structure, and Fig. 3 is a sectional view showing the construction state.
Figure 4 is a cross-sectional view showing the gaps between segments and the thin film material, Figure 5 a is a perspective view of the metal panel that makes up the segments, b is a detailed cross-sectional view of the joint part of the panel, and c is a pressurized panel. This is a detailed cross-sectional view showing the changes in the joint part when the . DESCRIPTION OF SYMBOLS 1... Circular segment, 2... Segment, 3... Panel, 4... Compression material, 5... Thin film material, 6
...Gap, 7...Rib, 8...Welded part.

Claims (1)

[Scope of utility model registration request] A roughly circular segment made of a metal film is arranged in the center, and a plurality of segments made of a large number of ribbed metal panels with the tips of adjacent ribs welded together are connected to the outer periphery of the circular segment and compression material. It is characterized by having gaps at appropriate intervals in the radial direction between the segments, one end of which is fixed to a circular segment, the other end of which is fixed to a compression material, and the space between each segment is covered with a soft thin film material. Air membrane structure made of metal membrane.