JP4056673B2 - Tensile membrane structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tension membrane structure.
[0002]
[Prior art]
As a tension membrane structure, for example, a suspension membrane method that suspends a membrane material as a structural material from a structure such as a support or an arch, or a type that uses a membrane material as a roof covering material for a cable frame stretched in a net shape A cable membrane type or a type using a membrane material as a roofing material or a wall material for a frame such as a plane truss or a three-dimensional truss is known.
[0003]
As these tension membrane structures, those with stretched Teflon membranes or glass fiber fibers are known, but such membrane materials generally used for tension membrane structures have a low Young's modulus (soft) and the initial stage when stretched By introducing the tension, a large elongation can be imparted at a low tension level. In addition, these film materials are soft, so that they are deformed along the design curved surface, absorb some construction errors, and are less susceptible to temperature deformation.
[0004]
On the other hand, since this type of conventional film material uses a resin as a coating material, deterioration due to stress such as ultraviolet rays is unavoidable and may be replaced with a service life of about 20 years. In addition, many of the conventional film materials are often used for building roofs by transmitting light to some extent, but they gradually become dim due to dirt over time, etc. There are many drawbacks.
[0005]
Further, although not used for a tension membrane structure, there has been a proposal of using a metal such as stainless steel, aluminum or titanium as a membrane material such as a roof plate membrane material or a wall material membrane material. For example, as the present applicant proposed Japanese Patent Laid-Open 5-287857 discloses the invention, made plurality of titanium having a connection structure of the special configuration Tatsutaira roofing plate or, in the invention described in JP-A-6-287766 As described above, there is known a titanium thin plate for building materials that can color an arbitrary color tone or give a self-cleaning action to a metal surface itself by a technique called oxidation treatment.
[0006]
However, metals are generally more sensitive to temperature shrinkage due to changes in temperature, etc. than cloth membranes, and there are problems such as wrinkles occurring on the membrane surface due to temperature changes. When used as a film material, it is limited to a special case in which no tension is applied to the joint between metal films. In addition, although stainless steel is relatively resistant to corrosion, it has a problem in workability such as high specific gravity and is hard (high Young's modulus), and aluminum is light and soft but has low weather resistance.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described points, and corrects the construction error and temperature deformation of the film material and has sufficient proof strength, and has extremely high weather resistance performance, and maintenance such as cleaning and replacement. We propose an excellent tensile membrane structure that eliminates the necessity.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention of claim 1 is a tension membrane structure in which a membrane material is stretched on a column or a frame, and a thin metal plate 9 provided with corrugation A is stretched as a membrane material 3. The corrugation is a unit corrugation 10 comprising a line-shaped groove 11 and a line-shaped groove 11a in the perpendicular direction so as to reduce the apparent Young's modulus of the film material. A tension membrane structure characterized by a large number of being distributed over the entire plate surface.
[0009]
The invention according to claim 2 is configured as a tension membrane structure according to claim 1 using a titanium thin plate as the metal thin plate 9.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
The tension membrane structure 1 of the present invention has, for example, a so-called suspension membrane method in which a membrane material 3 is lifted by a peak cable 4 and pressed by a trough cable 5 as shown in FIG. A so-called cable membrane system in which a curved surface constituted by a suspension cable group 6 having a reverse curvature and a holding cable group 7 is covered with a membrane material 3 or a frame 8 such as a plane truss or a solid truss as shown in FIG. A so-called framework membrane system in which the membrane material 3 is stretched as a roof material or a wall material can be employed.
[0012]
In the present invention, in such a tension membrane structure 1, as shown in FIG. 4, a thin metal plate 9 provided with corrugation A is stretched as a membrane material.
[0013]
The metal thin plate 9 can be an extremely thin metal plate (for example, about 0.1 mm to 1.0 mm) such as aluminum, stainless steel, titanium, etc., and the surface can be treated with an oxide film or the like. Those having functions such as plating on the back surface can be used.
[0014]
Corrugation A is provided to reduce the apparent Young's modulus and to give a large elongation by introducing an initial tension in order to avoid wrinkling of the plate surface due to temperature changes peculiar to thin metal plates. And the unit corrugation formed by the concave grooves and the line-shaped concave grooves in the orthogonal direction are distributed over the entire plate surface, so that the stress fluctuations in the orthogonal two directions can be absorbed.
[0015]
The shape, size and distribution (number of arrangements per unit area) of the unit corrugation may be appropriately selected according to the thickness of the plate and the assumed stress level. FIG. 5 shows an example of the unit corrugation 10. The unit corrugation 10 is provided with two line-shaped concave grooves 11 from the center and two line-shaped concave grooves 11a perpendicular to the concave groove. That is, it is configured by providing four concave grooves in a cross shape. A large number of such unit corrugations 10 are distributed over the entire plate surface.
[0016]
The shape of the unit corrugation 10 is not limited to that shown in FIG. 5 as long as it is composed of a line-shaped concave groove and the concave groove and a line-shaped concave groove in the orthogonal direction, as described above. As shown in FIG. 7, even in the unit corrugation 10 in which the straight line-shaped concave groove 11a extends from one end of the single line-shaped concave groove 11, or as shown in FIG. It may have a shape in which one straight line-shaped concave groove 11a is formed between the straight line-shaped concave grooves 11 or a plurality of two line-shaped concave grooves 11 as shown in FIG. A shape in which one long line segment-shaped concave groove 11a in the perpendicular direction is formed between the two line segment-shaped concave grooves 11 may be provided. In addition, the formation method currently performed can be employ | adopted for the formation method of corrugation.
[0017]
The metal thin plate 9 subjected to the corrugation A as described above is transported in the form of a roll or the like that has been subjected to draping at the factory in the same manner as a normal film structure, and welded according to the roof shape, for example, at the construction site. Or glue. Moreover, when welding the thin metal plate 9 along a three-dimensional curve, it can carry out using an automatic welding apparatus. The thin plates joined by welding or bonding can resist the required tensile force as a single membrane roof. Connections that form the boundary of the roof, such as pillars and cables, use dedicated hardware and jigs that can follow discontinuous forces and deformations.
[0018]
【The invention's effect】
As described above, the tension membrane structure according to the present invention has the above-described configuration, corrects the construction error and temperature deformation of the membrane material, and has sufficient strength. For example, when the expansion and contraction occurs due to temperature change, the corrugation part Therefore, it is possible to prevent inconveniences such that the deformation concentrates and the film material becomes an irregular corrugated sheet. In addition, the metal thin plate is easy to design because there is no significant bias in tensile strength as seen in conventional film materials, and it has excellent effects such as light weight and sufficient strength, and high fire resistance. To demonstrate.
[0019]
Further, the unit corrugation is composed of a line-shaped concave groove and a combination of the concave groove and a line-shaped concave groove in the orthogonal direction, and many unit corrugations are distributed over the entire plate surface. It can be stretched in a relatively uniform stretch state corresponding to the initial tension from the direction.
[0020]
In addition, in the case of using a titanium thin plate as a metal thin plate, it has high rust prevention properties without being coated, and hardly deteriorates due to ultraviolet rays or wind and rain. In addition, compared to surface treatments such as plating and painting, it is possible to employ an anodizing method with less fading and peeling, so that any color tone can be colored on the metal surface itself or a self-cleaning effect can be imparted. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a tension membrane structure of the present invention.
FIG. 2 is a perspective view showing another example of the tension membrane structure of the present invention.
FIG. 3 is a perspective view showing still another example of the tension membrane structure of the present invention.
FIG. 4 is an explanatory diagram showing a distribution state of corrugation in the present invention.
FIG. 5 is a perspective view showing an example of unit corrugation in the present invention.
6 is a longitudinal sectional view taken along line XX of FIG.
FIG. 7 is an explanatory diagram showing another form of unit corrugation of the present invention.
FIG. 8 is an explanatory diagram showing still another form of unit corrugation of the present invention.
FIG. 9 is an explanatory diagram showing still another form of unit corrugation according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tensile membrane structure, 2 ... Support | pillar, 3 ... Membrane material, 4 ... Peak cable, 5 ... Valley cable,
6 ... suspension cable group, 7 ... holding cable group, 8 ... frame, 9 ... metal sheet,
10 ... Unit corrugation, 11 ... Linear groove, 11a ... Linear groove

Claims (2)

A tension membrane structure in which a membrane material is stretched on a support or a frame, and a thin metal plate 9 provided with corrugation A is stretched as a membrane material 3, and the corrugation is an apparent membrane material. In order to reduce the Young's modulus , a large number of unit corrugations 10 composed of the line-shaped concave grooves 11 and the line-shaped concave grooves 11a in the orthogonal direction are distributed over the entire plate surface. Tensile membrane structure. The tension membrane structure according to claim 1, wherein a titanium thin plate is used as the metal thin plate.