JPH0438855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a three-dimensional truss support structure that supports a three-dimensional roof frame such as a dome or an arch by a ring around its outer periphery.

[Problem to be solved by the invention] The support structure of a three-dimensional roof is based on a ring that resists the horizontal component of the load in the meridian direction along the shape of the roof, and the nature of the ring is similar to that of a shell such as a dome. In a structure, it acts as a tension ring because the load is transmitted downward, and in an air membrane structure, the cable acts as a compression ring because it pulls the ring, so it has either a tension or compression function.

Tension rings usually use steel frames that can resist tensile stress, while compression rings use reinforced concrete that can withstand compression.The former has a structure that reliably transmits the vertical component of the load to the support, and the latter has a structure that anchors the support to the ground. It is said that

In this way, the function and structure of the ring are determined according to the type of three-dimensional structure employed in the roof frame, and the ring structure must be considered in accordance with each roof structure.

This invention proposes a new ring structure that can be applied to various types of roof structures, rather than configuring rings according to the type of roof structure as in the past, and aims to expand the range of applications as a ring structure. It is something to do.

[Means for Solving the Problems] This invention consists of a horizontally reinforced concrete structure with a ring-shaped bottom chord, and two steel-framed top chords arranged parallel to the bottom chord to form a third chord. , the outdoor upper chord member and the lower chord member are connected by a connecting member perpendicular to them, and two diagonal members are installed from each joint of the connected outdoor upper chord member, lower chord member, and connecting member, Passing in two directions to the indoor upper chord member, and joining four diagonal members passed from the adjacent joint parts in the indoor upper chord member at the same joint part,
As a tetrahedral unit whose sides are one chord, four diagonals, and one tie, and a pentahedron whose sides are two chords, four diagonals, and two ties. 1
This is a three-dimensional truss support structure that is made up of continuous, alternating directions.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

This three-dimensional truss support structure A has three chord members: a lower chord member 1, two upper chord members 2-1 and 2-2, a connecting member 3 that connects the second chord members, and diagonal members 4-1 and 4-2. It is made up of. And the upper chord material 2 is the outdoor upper chord material 2.
-1 and the indoor upper chord member 2-2.

The lower chord member 1 is made of reinforced concrete and has a ring shape in plan. Parallel to this, upper chord member 2-
By arranging two pieces 1 and 2-2, the three chord members of the basic framework are formed horizontally.

The two outdoor upper chord members 2-1 and the lower chord member 1 of the three chord members are connected by a connecting member 3 that is passed perpendicularly thereto, and a diagonal member 4 is connected at each joint 3a, 3a with the connecting member 3. Connect one end of -1 and 4-2. The diagonal members 4-1 and 4-2 are connected to the joints 3a and 3a, respectively.
The two diagonal members 4-1 and 4-2 are connected symmetrically to the indoor upper chord member 2-2 in two directions with respect to the connecting member 3.
give it to The two diagonals 4-1 and 4-2 passed from the adjacent joints are joined at the same joint, and the two diagonals 4-1 and 4-2 of the adjacent unit are connected to this joint 4a.
A total of four diagonal members including 4-2 are joined.

In this way, a lattice is formed on two planes between each chord member and another chord member connected by the connecting member 3, and a lattice is formed between the tetrahedron and the 5
The facepiece units are arranged alternately in one direction.

Next, the present invention will be explained with reference to the drawings of FIGS. 1 to 5 showing the case where the present invention is applied to a roof having a pneumatic membrane structure.

The air membrane roof causes compression in the three-dimensional truss support structure A, that is, the ring, but regardless of the type of stress, the shape of the truss should be such that the direction of the support reaction force matches the tangential direction of the meridian as shown in Figure 1. . That is, when the roof 8 is located higher than the ring, the truss is constructed in this way, and the same applies to the roof 8 which has a shell structure that is in tension in addition to the air membrane. On the other hand, for hanging structures where the roof 8 is lower than the ring, the trusses are assembled as shown in FIG.

In the embodiment shown in FIGS. 1 to 5, the lower chord member 1 and the outdoor upper chord member 2-1 are connected by the connecting member 3, and between the lower chord member 1 and the indoor upper chord member 2-2, both upper chord members 2-1,
A lattice is formed between 2 and 2 by diagonal members 4.

The lower structure including the lower chord member 1 is basically a reinforced concrete structure, but concrete blocks can also be used as formwork for the walls as in the embodiment.

A joint pipe 5 for joining is fixed to the lower chord member 1 of the reinforced concrete structure, and this joint pipe 5
becomes one joint portion 3a of the connecting member 3 and the diagonal member 4-1. The joining pipe 5 has two diagonal members 4-1 and 4- which connect the lower chord member 1 with the indoor upper chord member 2-2.
1 and the connecting member 3 that connects with the outdoor upper chord member 2-1 is joined.

Similarly, two diagonal members 4 are connected to the indoor upper chord member 2-2 at the joint portion 3a of the outdoor upper chord member 2-1.
-2, 4-2 and the tie member 3 are joined, and one diagonal member 4-2 joined here and one diagonal member 4-1 joined to the lower chord member 1 are connected to the upper chord member 2-2 on the indoor side. Joined at the same joint. A total of four diagonal members 4, two diagonal members 4-1 and 4-2 of adjacent units, are joined to the joint portion 4a of this indoor upper chord member 2-2. In the embodiment, a shaped steel is used for the indoor upper chord member 2-2, the plate 6 is joined to this, and the diagonal member 4 is joined to the plate 6, but the outdoor upper chord member 2-2 is
Similar to 1, steel pipes may be used.

As described above, this three-dimensional truss support structure A has a tetrahedron formed by the upper chord member 2-2 on the indoor side, diagonal members 4-1, 4-2, and connecting members 3, and a lower chord member 1 adjacent to the tetrahedron and the upper chord member on the outdoor side. material 2-1, tie material 3, diagonal material 4-1,
4-2 form a pentahedron, and these have a structure in which they are alternately continuous.

FIG. 6 shows an embodiment in which the roof 8 is lower than the ring, and shows how to assemble the truss when applied to a roof of a suspended structure such as a tent or a dish-shaped roof. In this case, the ring functions as a compression ring.

At this time, the connecting materials 3 are both upper chord materials 2-1 and 2-2.
The diagonal member 4 is passed between both upper chord members 2-1, 2-2 and the lower chord member 1 to form a lattice.

By the way, in this embodiment, the truss is formed mainly from steel pipes, but it is also possible to form the truss mainly from shaped steel.

The function of this structure constructed as described above is that it acts as a compression ring for the air membrane roof and as a tension ring for arches, domes, etc., and due to the nature of the three-dimensional truss, it is sufficient to withstand uneven loads. Has resistance.

In addition, lateral forces such as wind loads and seismic forces are resisted by transmitting the force through the three-dimensional truss to the wall that effectively acts as a load-bearing wall. Therefore, basically, the scale is sufficient to support the vertical component of the load.

Furthermore, the lower chord member 1 is not limited to being installed on a concrete wall as in the embodiment, but can also be installed directly on a foundation by enlarging the scale of the truss.

Further, the space between the members of the three-dimensional truss is used as a storage space for the equipment 7 as necessary.

〔Effect of the invention〕

The three-dimensional truss of this invention uses reinforced concrete as the planar, ring-shaped bottom chord, making it a particularly effective structure as a compression ring. The top chord, tie members, and diagonal members of the steel frame structure are shaped and joined in such a way that they mutually exhibit their respective mechanical properties, ensuring high rigidity and strength for the overall structure of the building. In other words, since the ring of the present invention has sufficient resistance to both compression and tension, it can be widely used as a support for various three-dimensional structure roofs, such as structures that cause compression in the ring, such as air membranes, and domes that cause tension.

Furthermore, by adjusting the way the trusses are assembled and the angles, it is possible to create a relatively flexible design, even with the same air membrane roof, for example.

This three-dimensional truss can stand on its own by joining in a ring shape, so the lower chord and lower structure can be simply supported by pins. Therefore, no moment is generated in the support part, and the lower structure can be small in size, allowing for an economical design.

[Brief explanation of drawings]

FIGS. 1 and 2 are a plan view and a three-dimensional view showing an embodiment of the present invention. 3, 4, and 5 are a sectional view, a plan view, and a front view, respectively, showing a part of this invention, and FIG. 6 is a sectional view showing another embodiment. A... Three-dimensional truss support structure, 1... Lower chord member, 2
...Top chord material, 2-1...Outdoor side top chord material, 2-2...
...Top chord member on the indoor side, 3...Tie material, 3a...Joint part, 4, 4-1, 4-2...Diagonal member, 4a...Joint part, 5...Join pipe, 6...Plate, 7 ……
Equipment, 8... Roof.

Claims (1)

[Claims] 1 A lower chord member 1 that is horizontally constructed of a reinforced concrete structure and has a ring shape on a plane, and two upper chord members 2-1 and 2-2 of a steel frame structure are arranged parallel to this lower chord member 1 to form a third chord member. , connect the outdoor upper chord material 2-1 and the lower chord material 1 with a connecting material 3 perpendicular to them, and from each joint of the connected outdoor upper chord material 2-1, lower chord material 1, and connecting material 3. Diagonal material 4-1, 4
-2 each, and the indoor side upper chord 2- in two directions.
2, and the four diagonal members passed from the adjacent joints at the indoor upper chord member 2-2 are joined at the same joint, and one chord member, four diagonal members, and one diagonal member are connected. A three-dimensional truss support structure consisting of a tetrahedron with connecting members as sides, a pentahedron with two chord members, four diagonal members, and two connecting members as sides, which are alternately continued in one direction as a unit.