JP2984201B2 - Curved space truss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved three-dimensional truss which forms a diamond-shaped mesh by arranging pre-assembled truss frame members in two directions inclined with respect to a ridge.

[0002]

2. Description of the Related Art A truss frame material in which an upper chord material and a lower chord material are connected by a lattice material is arranged in two directions inclined with respect to a ridge, and the truss frame material is arranged on a plane. In a three-dimensional truss that forms a diamond-shaped mesh, especially when the frame of the three-dimensional truss is entirely curved into a cylindrical shape,
Since the upper chord is partially bent, as shown in FIG. 7, the upper chords of the truss frame members adjacent to each other on the same line with the node therebetween are butted against each other at an angle at the node position on the vertical surface. .

For this reason, a joint plate which is arranged at a joint position and is bolted to an upper chord material gathered at the joint must be bent in accordance with a butt angle, and is welded to the upper surface of the joint plate to stiffen the joint plate. The rib plate also needs to be bent.

Since the joint plate and the rib plate are bent, high working accuracy is required to accurately join them to the upper chord material. If a manufacturing error occurs, a working error is caused, and joining work with bolts and the like is difficult. In addition, the transmission efficiency of the axial force between the upper chord members of the adjacent truss frame members is reduced.

The present invention proposes a three-dimensional truss which does not require bending of a joint plate and a rib plate.

[0006]

In a frame of a space truss, a continuous upper chord is curved upwardly as a whole by forming a fixed angle between upper chords of adjacent truss frame members with a node interposed therebetween. In the present invention, the upper chord material is bent upwardly convex at the position where the node is removed, thereby eliminating the need to bend the joint plate and the metal fitting with ribs while bending the frame of the space truss upwardly as a whole, It is possible to avoid the production error and the resulting construction error, and to facilitate the joining work of the joint plate and the ribbed metal to the upper chord material.

The truss frame material has a length straddling three nodes on the same line on a plane, and the lower chord material is bent upward at an intermediate node among the three nodes, and a straight line is formed between two adjacent nodes. The upper chord material is bent upward at an intermediate position between two adjacent nodes among the three nodes, and forms a straight line at an intermediate node position among the three nodes.

The upper chord is bent upward at an intermediate position between two adjacent nodes other than the nodes, so that the axes of both upper chords of the adjacent truss frames sandwich the node near the end of the truss frame. Can be positioned on the same straight line.

As a result, since there is no angle between the axes of the upper chord members sandwiching the node, there is no need to bend the joint plate and the metal fitting with ribs, and the production is simplified, and the production error and the resulting construction error are reduced. At the same time as the occurrence is avoided, the joining operation of the upper chord material to the joint plate and the joining operation of the ribbed hardware to the joint plate are facilitated. Further, loss of axial force transmission between the upper chord members of adjacent truss frame members is eliminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is constructed by arranging truss frame members 41 and 42 in which an upper chord member 1 and a lower chord member 2 are connected by a lattice member 3 in two directions inclined with respect to a ridge. 41, 42
Form a rhombic mesh on a plane, and have a three-dimensional truss as shown in FIGS.
The upper chord 1 of the truss frame 41, 42 is bent upward at a position where the nodal point is removed, and the upper chord of the truss frame 41, 41 (42, 42) adjacent on a plane and on the same line as shown in FIG. This is a space truss in which the axes 1 and 1 are located on the same straight line across a node. In FIG. 2, the dashed line indicates a line connecting the bent portions of the upper chord material 1, but the dashed line is also a line parallel to the ridge.

FIG. 2 shows a three-dimensional truss which forms a triangular mesh by laying a horizontal member 5 at the height of the upper chord member 1 and the lower chord member 2 in a direction parallel to the ridge center. A rhombic mesh is formed from the truss frame members 41 and 42 in two directions regardless of the presence or absence. The horizontal member 5 spans between two nodes in the direction of the ridge of the mesh, and is installed between the intermediate points of the parallel truss frame members 41, 41 (42, 42) which are inclined with respect to the ridge. The horizontal member 5 may be arranged only at the end of the space truss on the wife side.

The truss frame members 41 and 42 in two directions have a length extending between three nodes on the same line of the mesh on a plane, and as shown in FIG. 1, the lower chord member 2 is located at an intermediate node among the three nodes. It is bent upward and forms a straight line between two adjacent nodes.

The upper chord member 1 is bent upward at an intermediate position between two adjacent nodes among the three nodes, and forms a straight line at an intermediate node position among the three nodes. As shown in FIG. Lumber 41 (4
2) Adjacent truss frame members 41, 4 across the node near the end
The axes of both upper chord materials 1 and 1 (42, 42) are located on the same straight line. The upper chord material 1 forms a straight line at any of the nodes, and no angle is formed between the axes of the adjacent upper chord materials 1 and 1 with the node interposed therebetween.

As shown in FIG. 2, two truss frame members 41 (42) are connected to one truss frame member 41 (42) in the other direction.
They are combined so as to hit the middle node position of (41).

A bundle member 6 for maintaining a distance between the upper chord member 1 and the lower chord member 2 is disposed at the joint position, and its axis has a radius of curvature when a continuous line of the upper chord member 1 is regarded as a circular arc as a whole. However, the axis of the bundle 6 and the axis of the upper chord 1 are orthogonal to each other at the nodes.

FIG. 3 shows a joint between adjacent truss frame members 41, 41 (42, 42) on the same line with a node interposed therebetween, and FIGS. 4 to 6 show planes thereof. As shown here, joining plates 7 and 8 are basically joined to the upper and lower ends of the bundle 6, and the upper chord 1 and the lower chord 2 are joined to the joining plates 7 and 8. Joint plate 7 on the upper chord 1 side
Is a metal fitting 9 with a rib for transmitting a shear force between the upper chord materials 1 and 1
At the same time, it is joined to the upper chord material 1 with bolts. Since the axis of the bundle 6 and the axis of the upper chord 1 are orthogonal to each other at the nodes, the joint plate 7 and the metal fitting 9 on the upper chord 1 do not need to be bent.

3 to 5 show the case where the upper chord 1 and the lower chord 2 and the metal fitting 9 with ribs are angle iron, and FIG. 6 shows the case where the metal fitting 9 is T-shaped steel. Since it does not bend, a member having the same cross-sectional shape as the upper chord material 1 and the lower chord material 2 can be used. Therefore, it is sufficient to use the extra length of the upper chord material 1 and the lower chord material 2 at the time of manufacturing the truss frame material 41 (42). .

As described above, one truss frame member 41 (42) abuts on an intermediate node position of the other truss frame member 42 (41), and as shown in FIGS. The truss member 41 (42) penetrates the joints. However, even when the horizontal member 5 is not installed between the joints, one of the truss frame members 41 can be used.
The other truss frame members 42 (41) and 42 (4)
1) The upper chord members 1 and 1 are bolted to the metal fitting 9 with ribs together with the joint plate 7 extending between them. FIG. 5 shows a case where the horizontal member 5 is arranged only on one side of the node.

The lower chord members 2 of the truss frame members 41 and 42 are adjacent to each other.
A straight line is formed between the nodes, and the node bends upwardly at the node portion. However, since there is no need to transmit a shearing force between the lower chord members 2 adjacent to each other with the node interposed therebetween, the bent metal fitting 9 with ribs is used.
Therefore, the lower chord 2 of each of the truss frame members 41 and 42 only needs to be bolted to the joint plate 8 which is bent or curved upwardly.

[0020]

According to the present invention, the upper chord is bent upward at the position where the nodal point is removed, so that the frame of the space truss is curved convex upward as a whole, but is adjacent on a plane and on the same line. The axis of the upper chord member of the truss frame member can be located on the same straight line across the node.

As a result, it is not necessary to bend the joint plate and the metal piece with the rib, and it is possible to avoid a production error and a construction error caused by bending the metal piece with the rib and the joint plate. The joining operation to the upper chord material is also facilitated, and the loss of axial force transmission between the upper chord materials of the adjacent truss frame members is eliminated.

Since the metal parts with ribs do not need to be bent, it is sufficient to use excess lengths of the upper chord material and the lower chord material as metal parts with ribs, and it is not necessary to separately prepare a member as metal parts with ribs. Therefore, simplification of the production of the truss frame material and reduction of the production cost are achieved.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a part of a space truss.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged view of a node position in FIG. 2;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a plan view of FIG. 3 in a case where the horizontal member is on only one side of the node.

FIG. 6 is a plan view of FIG. 3 when the upper chord is a T-section steel.

FIG. 7 is an elevation view showing a part of a conventional space truss.

[Explanation of symbols]

1 ... upper chord material, 2 ... lower chord material, 3 ... lattice material, 41, 42
... truss frame material, 5 ... horizontal material, 6 ... bundle material, 7, 8 ...
... Joint plate, 9 ... Hardware with ribs.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/32 102 E04B 1/19 E04B 7/08

Claims (1)

(57) [Claims] 1. A truss frame material in which an upper chord material and a lower chord material are connected by a lattice material are arranged in two directions inclined with respect to a ridge center, and the truss frame material forms a rhombic mesh on a plane. In a three-dimensional truss that curves convexly upward as a whole, the truss frame material has a length that spans between three nodes on the same plane on a plane, and its lower chord material projects upward at an intermediate node among the three nodes. The upper chord is bent to form a straight line between two adjacent nodes, and the upper chord is bent upward at an intermediate position between two adjacent nodes among the three nodes.
A curved three-dimensional truss that forms a straight line at the middle node position among the nodes, and the axes of both upper chords of the adjacent truss frame members are located on the same straight line with the node near the end of the truss frame member.