JPH0233553Y2 - - Google Patents

Description

[Detailed explanation of the idea] This idea relates to membrane structure.

In recent years, membrane structures have attracted attention as a new architectural structure. This membrane structure is intended to be a semi-permanent fixed structure in contrast to conventional so-called tents, and has already been used in many cases in the United States, including in covered stadiums.

The main structure of this type of membrane structure is a high-strength membrane body made of a fiber layer such as glass fiber coated with polytetrafluoroethylene resin, etc., and it is possible to obtain a large internal space, shorten the construction period, and reduce the construction time. It has advantages such as cost reduction.

The basic form of this membrane structure is roughly divided into so-called air membrane structure and tension membrane structure. The air membrane structure has a pressure (usually about atmospheric pressure) inside the structure closed by the membrane body.
0.25% increase) to form a predetermined shape, and the tension membrane structure is a structure in which a membrane body is stretched over a frame or structural cable.

What is important in the above-mentioned membrane structure is to obtain a stable membrane structure, and for this purpose, the principal stress lines that intersect with each other in the membrane plane must have multiple curvatures and appropriate initial tension must be introduced. is necessary.

For example, as shown in Figure 1 a, if we consider a cable X on which only its own weight acts, it becomes a catenary curve and is balanced, but when another load W is applied, the cable A new equilibrium state is created. Such a structure cannot be said to be a stable structure.

However, if a cable Y is entwined with the cable X so that the curvatures are opposite to each other and tension is applied, the cables X and Y will be in a balanced state due to interaction, resulting in a stable structure.

This idea was made in view of the above points,
A first cable group stretched in one plane, a second cable group stretched in the other plane, and pyramids pointing upward and downward alternately in the longitudinal direction of the cable group stretched. A membrane structure consisting of a membrane body cut three-dimensionally so as to be formed continuously or continuously, the top of the upward cone being connected to either the first cable group or the second cable group. The tops of the downward pyramids are each fixed to the other cable group, and a membrane is stretched by applying tension to both cable groups, thereby creating a principal stress line having multiple curvature. The purpose is to easily introduce tension into the membrane structure itself.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 2 to 4, 1 is a first cable group, 2 is a second cable group, and 3 is a membrane body.

The first cable group 1 consists of a plurality of cables stretched parallel to each other, and this cable group is arranged in one plane. On the other hand, the second cable group 2 similarly consists of a plurality of cables stretched in parallel to each other, and these cables are arranged in one plane. In this embodiment, the plane on which the first cable group 1 and the plane on which the second cable group 2 are disposed are each plane and parallel to each other. Further, each cable of the first cable group 1 and each cable of the second cable group 2 are arranged so as to be substantially orthogonal in plane, as shown in FIG.

The membrane body 3 is pre-cut in three dimensions so that upward and downward pyramids are formed alternately or continuously in the longitudinal direction of both cable groups 1 and 2 to be stretched. In this embodiment, as shown in FIGS. 2 and 3, a structure in which upward and downward square pyramids are alternately formed is used. Further, the membrane body 3 is stretched between the first cable group 1 and the second cable group 2. FIG. 4 is a plan view of this embodiment, in which the ◯ marks α and the × marks β indicate the locations where the stretched membrane body 3 is fixed to the cable groups 1 and 2. Among these, the ○ mark α indicates the location where the top of the upward square pyramid of the membrane body 3 is fixed to the upper first cable group 1, and the × mark β indicates the location of the downward square pyramid of the membrane body 3. The top part shows the location where it is fixed to the lower second cable group 2. Therefore, in this embodiment, the fixed points α and β are arranged in a checkered pattern. Various conventional means can be used to fix the membrane and the cable, but for example, by fixing a plate to the membrane 3 and fastening the cable to this plate with a mounting bracket, the membrane 3 can be fixed. and the cable is fixed.

In the membrane structure described above, since tension can be easily introduced into the membrane body 3, a stable structure can be obtained. Furthermore, during construction, it is only necessary to attach the membrane body with the cable loose on the ground, pull up the cable and apply tension to it, and there is no need to directly pull the membrane body itself, so construction is simple.

The pulling and tensioning of this cable can also be carried out by means customary for this type of structure, such as a tension membrane structure. For example, each cable can be connected to the tips of multiple pillars whose bases are pivoted to land or steel structures, etc. and are tilted, and by raising these pillars, the cables can be pulled up. and tension is applied.

In addition to the embodiments described above, various modifications can be made, such as the arrangement of the cables in the cable group, the locations where the membrane is fixed to the cables, and the relationship between the surfaces formed by the cable group.

5 and 6 show an embodiment in which the membrane structure of the present invention is applied to a circular roof.

In this embodiment, the cables of each cable group 1 and 2 are arranged not parallel to each other but radially, with the cables of the first cable group 1 on the upper side and the cables of the second cable group 2 on the lower side. are arranged in a staggered manner. The membrane body 3 in this embodiment is constructed in a three-dimensional structure so that upward and downward square pyramids are continuously formed in the longitudinal direction of the cable groups 1 and 2, as shown in FIGS. 5 and 6. I use cut pieces. That is, the membrane body 3 is used in which a cone extending upward in the longitudinal direction of the first cable group 1 and a cone extending downward in the longitudinal direction of the second cable group 2 are formed continuously. Note that 4 in Fig. 5 is the basic structure.

In the embodiment shown in FIG. 7, the surfaces formed by the cable groups 1 and 2 are not flat surfaces, but curved surfaces. Further, the membrane body 3 has a structure similar to that of the previous embodiment. Furthermore, in any of the embodiments shown in FIGS. 5 to 7, the cable groups 1 and 2 of the membrane body 3
The fixing to is the same as in the previous embodiment.

As described above, the membrane structure of the present invention has the advantage of being able to form multiple curvatures and easily introducing tension, resulting in a stable structure.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of cable balance in a membrane structure, Fig. 2 is a perspective view showing an embodiment of the present invention, Fig. 3 is a front sectional view thereof, Fig. 4 is a plan view, and Fig. 5 is a A perspective view showing another embodiment, FIG. 6 is an enlarged view thereof,
FIG. 7 is a front sectional view of still another embodiment. 1... First cable group, 2... Second cable group, 3... Membrane body, 4... Basic structure.

Claims (1)

[Scope of utility model registration request] A first cable group stretched in one plane, a second cable group stretched in the other plane, and pyramids pointing upward and downward alternately in the longitudinal direction of the cable group stretched. a membrane body which is three-dimensionally cut so as to be formed continuously or continuously; A membrane structure characterized in that the membrane body is stretched by fixing the tops of the downward pyramids to the other cable group and applying tension to both cable groups.