JPH0625490B2 - Membrane roof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a membrane structure roof having a structure capable of introducing re-tension into a membrane material.

[Problems to be Solved by the Invention]

The film material is self-sustaining by the application of tension and forms a frame, but if tension is applied for a long period of time, the film material creeps over time and the tension is gradually lost. It has weaknesses, and especially when the membrane material is stretched on a plane, there is a risk of flapping due to wind pressure.

Therefore, compensating for the loss of initial tension, that is, applying re-tension to the film material, is a major issue in maintaining the independence of the film material.

The present invention has been made in view of this problem, and is intended to newly propose a means for introducing a re-tension into a membrane material by a simple operation.

[Means for Solving the Problems]

According to the present invention, an arch material having a downward curvature which is in contact with the membrane material is installed under the membrane material, and the curvature of the arch material is made variable to allow re-tensioning to the membrane material.

A nut is rotatably attached to both ends of the arch member, and a bolt joined to a pin protruding from a beam facing the nut is screwed into the nut.

By adjusting the screwing length of the nut screwed to this bolt, the curvature of the arch material can be changed, and by increasing the curvature, the arch material pushes up the membrane material and re-tension is introduced into it. Become.

〔Example〕

 The present invention will be described below with reference to the drawings illustrating an embodiment.

The membrane structure roof A of the present invention has a structure for forming a membrane structure as shown in FIG. 1 and forcibly re-tensioning the one unit membrane material 1 shown in FIG. 2 by the curved arch material 2. It is a thing.

As shown in FIG. 3, the membrane material 1 is erected in a state in which tension is applied between the surrounding beams 3 and 3 forming the framework of the membrane structure.

An arch member 2 having a downward curvature is provided between the beams 3 and 3 facing each other in one direction on the lower side of the film member 1 so as to contact the lower surface of the film member 1.

As shown in FIG. 4, nuts 6 and 6 are provided at both ends of the arch member 2.
Is rotatably mounted, and bolts 4, 4 are pin-joined to a bracket 5 projecting from the side surface of the beam 3, and nuts 6 at both ends of the arch member are screwed into the bolt 4, and the bolt 6 of the nut 4 The curvature of the arch member 2 can be changed by adjusting the screwing length to the portion. If the screwing length of the nut 6 is increased, the curvature of the arch material 2 is decreased, while if it is decreased, the rise of the arch material 2 is increased and the tension is introduced into the film material 1.

In the illustrated embodiment, a wire 7 is stretched under the arch material 2 as a tension material between the beams 3 and 3. However, the wire 7 increases the curvature of the arch material 2 to apply tension to the film material 1. When applied, it acts on the arch material 2 as a reaction force of the film material 1 to cancel out the axial force applied to the nodal position thereof so that the beam 3 is not twisted.

〔The invention's effect〕

As described above, the present invention changes the curvature of the arch member by a simple and inexpensive means such as connecting the bolt to the bracket protruding from the beam with a pin and screwing the bolt into the nut at the end of the arch member. Since it is to push up the membrane material by, the re-tension can be easily introduced to the membrane material,
It is possible to recover the initial tension loss due to creep.

[Brief description of drawings]

1 and 2 are schematic diagrams showing a membrane structure and a membrane roof, respectively, and FIGS. 3A and 3B are -I and II, respectively, which are XX of FIG.
A line, a YY line sectional view, and Drawing 4 are some expanded views of Drawing 3-I. A ... Membrane structure roof 1 ... Membrane material, 2 ... Arch material, 3 ... Beam, 4 ... Bolt, 5 ... Bracket, 6 ... Nut, 7 ... Wire.

Claims (1)

[Claims] 1. An arch material, which is constructed by contacting a lower surface of a membrane material stretched between surrounding beams forming a frame with an arch material curved to a downward curvature in contact with a lower surface of the membrane material. Membrane structure characterized in that the nuts rotatably attached to both ends of the bolts are screwed with bolts that are pin-jointed to brackets protruding from the beam, and the curvature of the arch material is variable depending on the screwing length of the nuts. roof.