JPS62182343A - Bent part structure of truss girder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a structure of a bent portion of a truss beam.

``Conventional technology J Long span + 1 is the gift roof rack + I■ As a format,
Truss structures using prefabricated materials and nonyl structures are used.

As previously filed in Japanese Patent Application No. 60-175997, the present applicant has proposed that prestress is introduced by placing prestressed steel on the upper or lower chord or diagonal members and tensioning the prestressed steel. proposed a truss beam.

``Problems to be solved by the invention'' However, when actually constructing using the above truss beam,
It turns out that there are still issues that need to be resolved. In other words, when the prestressing steel material is tensed, an excessive load is applied to the bending part of the truss beam, and there is a problem of how to deal with this excessive load. The problem is how to connect the truss constituent members such as the lower chord members and lattice members, or the connecting members that connect the truss beams, and how to arrange the prestressing steel materials at the bends of the truss. .

This invention was made in view of the above circumstances, so it has sufficient strength, and the truss components (or connecting members connecting the truss beams) can be attached at any angle. Therefore, it is an object of the present invention to provide a truss beam bending structure in which a plurality of PCGUs can be arranged without interfering with each other.

``Means for Solving the Problems'' This invention arranges a spherical joint at the bent part of a truss beam assembled in a truss shape by upper chord members, lower chord members, and lattice members,
P for introducing prestress so as to penetrate the spherical joint.
The structure includes CM material.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 7.

First, a structure Z constructed using a truss beam 1 according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an elevational view of this structure Z, and FIG. 2 is a partial plan view. (The right side of the center line in Figure 2 represents the roof surface, and the left side represents the roof frame.) As shown in these figures, the structures Z are erected parallel to each other and have external walls. A truss beam I extending in the X direction (beam-to-beam direction) in the figure is attached to the structure 2 forming the structure. The structure 2 is formed by a house 2a and a wheel garter 2b with a frame extending over the upper end of the house 2a, and is self-supporting on the ground via a foundation 3. In between) S1 defeated truss beam 1
are arranged parallel to each other with both ends supported by the structure 2. The truss beams 1 are connected to each other by connecting members 4.5, and a roof fold 6 is attached to the upper part of the truss beam 1, thereby forming a roof R. Incidentally, this structure Z is very large, for example, with a span dimension of 100 m, an effective floor height of 7 m, and a distance between truss beams l of 5 m.

The details of the truss beam 1 used in the above-mentioned structure Z will be explained with reference to FIGS. 87. They are assembled by a lattice material 9 made of steel pipes that connects them. Ribs 10 are attached to the lower chord member 8 at predetermined intervals on both sides of the web, and a sheath pipe 11 having a length extending over the entire length of the lower chord member 8 is attached to pass through the ribs 10. I
A PC steel material 12 is passed through I. This PCl41
12, after the upper chord material 7, the lower chord material 8, and the lattice material 9 are connected to each other and the assembly is completed, and finishing materials and other equipment necessary for the function of the structure Z are installed on the roof R, tension is applied. Both ends of the PCj14 material I2 are fixed to both ends of the lower chord member 8. As a result, truss beam 1
A compressive force is applied in advance by the 20w4 wire 12 to introduce prestress.

At the bottom of the truss beam 1, there are two bent parts A and A in the center.
Also, bent portions B are provided at both ends (see FIG. 1).

To explain the bent part A, as shown in Figs. 3 to 6, there is a steel joint 2 formed in a solid spherical shape.
1 is used, and this joint 21 has a lattice whose mating surface with this joint 21 is formed into an arcuate curved surface having the same curvature as the outer surface of the joint 21. They are connected by fixing means.

The joint 21 has a PCR material 1 extending from the right to the left in FIG.
Holes 22, 22 for passing through the holes 22, 22 are provided parallel to each other and curved downwards.

Further, the joint 21 is provided with holes 23 and 23 extending from the left to the right in the figure, through which the PC steel material 12 passes, and are curved so as to expand to both sides.

The ends of the PC steel material 2 passing through the holes 22 and 23 of the joint 21 are provided so as to extend in the normal direction to the joint 21 after exiting the holes 22 and 23, and A nut 25 is fixed to the nut holder through a material 24.

On the other hand, to explain the bent part B, a joint 31 made of W4 and formed in a solid spherical shape like the joint 21 is used here, and the mating surface with the bundled joint 31 is the same as the joint 31. The lattice material 9 and the lower chord material 8, which are formed into an arcuate curved surface having the same curvature as the outer surface of the lattice material 9, are connected by a fixing means such as welding.

The joint 31 has a hole 32 for passing the pca+412 through it.
is curved so as to be connected in a straight line to the north pipe 11 attached to the lower chord member 8 connected to the lower chord member 3I. Further, a connecting portion 4.5 for connecting the truss beams l is connected to the joint 21.31 by a fixing means such as welding.

This truss beam 1 configured as described above has PCM wires 1
By adjusting the prestress no.J according to 2, not only the deflection of this truss beam 1 is reduced, but also PC! [
112 can bear a part of the tensile force applied to the lower chord l7t8, and the stress on the lower chord member 8 can be reduced accordingly.

Moreover, there is a spherical joint 21.31 at the bending part of the truss beam I.
Due to manufacturing errors or assembly errors, the truss component members 7, 8, and 9 may be attached at different angles, or the angle between these members and the joint (No. 4.5 may be slightly greater than the intended angle). Even if it shifts, the truss component 7
．． 8.9. This can be easily handled by shifting and fixing the mating surfaces formed in the arcuate curved surfaces of the connecting members 4.5 along the outer surfaces of the joints 2+ and 31 as appropriate.

Also, PC steel material! The compressive force of the lower chord member 8 that acts on the lower chord member 8 when the lower chord member 2 is tensioned is uniformly distributed to the truss component (off, 8.9) connected to these joints via the spherical joints 2+, 31. Therefore, stress is not concentrated at the bent portion, resulting in extremely strong strength.

Furthermore, there are multiple PCv4 materials 12, and those PC steel materials 1
2 extend to intersect with each other, as shown by the bent portion A, the hole 22.2 is for passing the PC steel material I2 through.
23 is appropriately curved within the joint so that it extends in the normal direction at the outer end, the plurality of PC steel materials 12 will not intersect, and the PC steel materials 12 can be arranged while maintaining the strength of the joint. can be done.

By using the above-mentioned truss beam I, in the structure Z, a long span of 100 m can be secured at the minimum required height without causing large deflection of the truss beam 1, and therefore the internal An economical structure is realized without wasting space.

Note that the joints used for the bending portions of the truss beam I are not limited to the solid spherical joints used in the above embodiments, but may also be spherical steel outer joints as shown in FIG. A structure consisting of a plate 41 and a grout material 42 filled inside the plate 41 may be used, or a structure consisting only of a spherical outer plate 51 with a hollow interior as shown in FIG. 9 may be used. may also be used.

In addition, in the above embodiment, an example in which the present invention is applied to the bent portions A and B produced by connecting the lower chord members 8 has been described, but of course, the present invention can also be applied to the bent portions of the upper chord member 9. Can be applied.

"Effects of the Invention" As explained in detail above, according to the bending part structure of a truss beam of the present invention, the bending part of a truss beam assembled into a truss shape by upper chord material, lower chord material (E), and radius material. It has a configuration in which a spherical joint is disposed in the spherical joint, and a Pcg+O for introducing prestress is disposed so as to pass through the spherical joint.This provides the following excellent effects.

■Since the joint is formed into a spherical shape, if the truss components connected to the joint and the connecting members connecting the trusses are arranged so that their axes pass through the center of the joint, the bending The external force applied to the truss component,
It will be widely dispersed through the connecting member, resulting in high strength.

■Since the truss constituent members or connecting members can be in spherical contact with the joint, these truss constituent members and connecting members can be connected to the joint at any angle.
Assembly work on site becomes easier.

■Also, by arranging the PC steel material so that it curves inside the joint, multiple PC steel materials can be arranged, and if the PCI material is made to extend in the normal direction at the point where it exits from the joint, The strength as a joint can be ensured.

[Brief explanation of drawings]

Figure 1 is an elevation view of a structure using truss beams, Figure 2 is a partial plan view of the structure, Figure 3 is a detailed view of the bend A in Figure 1, and Figure 4 is 1V in Figure 3. - Sectional view along line IV, No. 5
The figure is a sectional view taken along the line ■-■ in Fig. 3, Fig. 6 is a sectional view taken along the line Vl-Vl in Fig. 3, Fig. 7 is a detailed view of the bent part B in Fig. 1, and Fig. 8 9 and 9 are sectional views of essential parts showing embodiments of the pond of the present invention, respectively. 1...Truss beam, 7...Top chord material, 8...Bottom chord material, 9...Lattice material, 12...PC steel material, 21.31... Joint, 22.23.32... Hole, 41.51... Outer plate, 42... Grout material.

Claims (1)

[Claims] A spherical joint is arranged at the bent part of a truss beam made up of upper chord members, lower chord members, and lattice members, and a PC steel material for introducing prestress is arranged so as to penetrate the spherical joint. Features a truss beam bending structure.