JPH03253678A - Truss assembly construction of membranous roof - Google Patents

Abstract

PURPOSE:To reinforce rigidity of a truss assembly construction by standing trusses connected to upper chords, lower chords and diagonal members in a row at specific intervals, and connecting between trusses with horizontal tie rods and buckling prevention diagonal members to cover a membranous roof. CONSTITUTION:Trusses connected to upper chords 1a, lower chords 1b and diagonal members 1c are stood in a row at specific intervals, and the lower chords 1b of the trusses 1 are stood in a row at specific intervals to connect them with horizontal tie rods 2 of the direction at right angles. Two points A and A into which the horizontal tie rods 2 are divided at equal distances and two points B and B into which the upper chords 1a re divided at an equal distance from points on the upper chords 1a right above of the intersection with the lower chords 1b and the horizontal tie rods 2 are connected with the buckling prevention diagonal members 3 respectively. A membranous roof such as a soft plastic sheet, etc., is covered on the truss assembly construction, and a hold-down cable is tightened between the trusses 1 to control the looseness of the membranous roof. According to the constitution, rigidity of the truss construction can be greatly reinforced without having contact of reinforced materials with the membranous roof or eyesores of horizontal members.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a truss structure for a membrane roof that supports a membrane roofing material such as a flexible plastic sheet.

[Prior Art and Problems to be Solved by the Invention] Conventionally, the truss structure of a membrane roof that supports a membrane roofing material such as a flexible plastic sheet generally has the following structure, as shown in FIGS. 2 and 3. The lower chords of the parallel truss a are connected by a horizontal tie member C, and an intermediate fulcrum is provided on the lower chord member to ensure its horizontal rigidity, and the intersection point O between the lower chord member and the horizontal tie member C is provided.
A diagonal member e, which prevents buckling, is connected to points A and A, which are equidistantly distributed on the horizontal tie member C from the point A, and a point B on the upper chord member d of the truss directly above the intersection O between the lower chord member and the horizontal tie member C. By connecting at e, an intermediate fulcrum is also provided on the upper chord member d.

Its horizontal rigidity is ensured.

This is because, due to the nature of the membrane roofing material f, the slack that occurs between the trusses a and a of the membrane roofing material f supported by the upper chord member d of the truss is suppressed by the restraining cable g placed between the trusses a and a.
The membrane roof is a combination of peaks and valleys, and the upper chord member d cannot be provided with a horizontal member to ensure its horizontal rigidity.

Therefore, instead of installing a horizontal member on the upper chord member d, the lower chord member
If you install a horizontal member in the shape of a mold, it will be X when viewed from below.
The shaped horizontal members become an eyesore. In order to avoid this, the anti-buckling diagonal material e is made by connecting the upper chord material d and the horizontal tie material C in a downward direction so as not to contact the valleys of the membrane roof. is connected perpendicularly to the upper chord member d, so there was a problem that sufficient horizontal rigidity of the upper chord member d could not be ensured.

Another method is to rigidly connect the lower chord member and the horizontal connecting member C, and use the stiffener effect to ensure the horizontal rigidity of the truss a, but this method only complicates the joint. Its effect is small.

The present invention has been made in view of the above-mentioned conventional problems and has been made with the aim of solving the problems.It does not conflict with the membrane roof, which is a combination of peaks and valleys, and there is no unsightly horizontal member. The object of the present invention is to provide a truss assembly structure for a membrane roof that can significantly strengthen the rigidity of the truss.

[Means to solve the problem]

In order to achieve the above object, the present invention connects the lower chord members of parallel trusses with horizontal connecting members, and also distributes two equal distances on the horizontal connecting members from the intersection of the lower chord members and the horizontal connecting members.
A truss of a membrane roof in which a point and two points distributed equidistantly on the upper chord from the point on the upper chord of the truss directly above the intersection of the lower chord and the horizontal tie member are connected by buckling prevention diagonals, respectively. It features a assembled structure.

[For production]

The lower chord members are connected by a horizontal tie member, and the upper chord members are connected at two points equidistant on the horizontal tie member from the intersection of the lower chord member and the horizontal tie member, and directly above the intersection of the lower chord member and the horizontal tie member. Because it is connected by a buckling prevention diagonal that connects a point on the top chord of the truss to two points distributed equidistantly on the top chord,
The distance between the supporting points of the top chord is shortened, and the anti-buckling diagonal intersects with the top chord at an internal angle of less than 90 degrees, so the connection with the top chord becomes similar to a rigid frame structure, and the reinforcement membrane The rigidity of trussed structures can be significantly increased without contact with the roof or without unsightly horizontal members.

〔Example〕

The present invention will be explained in detail below based on an illustrated embodiment.

In Figure 1, 1 connects the upper chord member 1a and the lower chord member 1b to the diagonal member 1.
The lower chord members 1b of each truss 1 are connected by orthogonal horizontal connecting members 2 arranged in parallel at predetermined intervals.

Reference numeral 3 denotes a buckling prevention diagonal member provided at each intersection point between the truss 1 and the horizontal tie member 2 in order to ensure the horizontal rigidity of the upper chord member 1a of each truss l, and the lower chord member 1b and the horizontal tie member 2. Two points A distributed equidistantly on the horizontal tie material 2 from the intersection ○
, A, and two points B' and B' equidistant on the upper chord 1a from the point O' on the upper chord la directly above the intersection O of the lower chord 1b and the horizontal tie 2, using diagonal members, respectively. They are connected.

In addition, the connection angle between the upper chord member 1b and the buckling prevention diagonal member 3 is 45
degree is mechanically preferable.

The truss structure of the membrane roof of the present invention is constructed like a ridge, and the truss structure is covered with a membrane roof made of a flexible plastic sheet as shown in FIG. A restraining cable is stretched between each truss 1, and the slack in the membrane roof that occurs between each truss 1 is suppressed.

〔Effect of the invention〕

As explained above, in the truss assembly structure of the membrane roof of the present invention, the lower chord members are connected by the horizontal connecting members, and the upper chord members are distributed equidistantly on the horizontal connecting members from the intersection of the lower chord members and the horizontal connecting members. 2 points and 2 points distributed equidistantly on the upper chord from the point on the upper chord of the truss directly above the intersection of the lower chord and the horizontal tie member.
Because the points are connected by buckling prevention diagonals, the distance between the supporting points of the top chord is shortened, and the buckling prevention diagonals intersect with the top chord at an internal angle of less than 90 degrees. , the connection with the top chord is similar to that of a rigid frame structure, which has the effect of significantly increasing the rigidity of the truss structure without contacting the reinforcing material with the membrane roof and without obtrusive horizontal members. .

[Brief Description of the Drawings] Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a vertical sectional view showing an example of a conventional membrane roof truss assembly structure, and Fig. 3 is a conventional example of the same. FIG. 1...Truss, la...Top chord member, 1b...Lower chord member, 2...Horizontal tie member, 3...Buckling prevention diagonal member, O...
・The intersection of the lower chord and the horizontal tie, 0'...The point of the upper chord Murakami directly above the 0 point, A...The point equidistant from the 0 point on the horizontal tie, ...○' point Points distributed equidistantly on the upper chord from . Shimizu Corporation Diagram Truss〇----Top chord b----1 Lower chord 2--1 Horizontal connecting material 3-1--Supply material for bending

Claims (1)

[Claims] The lower chord members of the parallel trusses are connected by a horizontal tie member, and two points are distributed equidistantly on the horizontal tie member from the intersection of the lower chord member and the horizontal tie member, and the intersection of the lower chord member and the horizontal tie member. A truss assembly structure for a membrane roof, characterized in that a point on the upper chord of the truss directly above is connected to two points distributed equidistantly on the upper chord using buckling-preventing diagonals.