JPH0554545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a truss used in various buildings.

[Prior Art] For example, as disclosed in Japanese Patent Application Laid-Open No. 120936/1982, an upper lattice and a lower lattice made of vertical and horizontal chords, and each intersection point that interconnects the intersections of the chords in both lattices. At the joint between these lattice and diagonal members, four diagonal members are arranged and sandwiched between the intersecting vertical and horizontal chord members, and each diagonal member is A truss in which a member and vertical and horizontal chord members are fastened and fixed using four bolts corresponding to each diagonal member is known.

However, since the above-mentioned conventional truss has a configuration in which diagonal members are directly sandwiched between vertical and horizontal chord members, the axes of these chord members and diagonal members are misaligned at the center of the joint. When a force in the axial direction is applied to the diagonal members, a moment is generated at the joint, and the truss is easily deformed or damaged.

In addition, since the string and diagonal members must be tightened and fixed using four bolts at each joint, not only does it take a lot of tightening man-hours and the assembly work is troublesome, but also the bolts must be tightened evenly. It also had the disadvantage of being difficult to tighten with force and poor workability. Furthermore, in order for each bolt to maintain the necessary tightening force for fixing, it is necessary to use bolts that are somewhat thick, but if the bolts are made thicker, the bolt holes drilled in the string and diagonal members must be made larger. Therefore, there was a problem in that the strength of the chord members and diagonal members was likely to decrease.

[Problems to be Solved by the Invention] An object of the present invention is to easily and firmly connect vertical and horizontal chord members and diagonal members, and to prevent the generation of moment due to misalignment of the axes of each member at the joint. The purpose is to prevent it.

[Means for solving the problems] In order to solve the above problems, the truss of the present invention has the following features:
It consists of an upper lattice and a lower lattice consisting of vertical and horizontal chords divided at each intersection, and diagonal members divided at each intersection that interconnect the intersections of the chords in both lattices. In order to intersect the longitudinal and horizontal chord members that intersect each other and the diagonal members that abut each other on the same plane at a point on the center line of the joint at the joint with the member. A plurality of connecting holes are formed by abutting washers on both the upper and lower outer surfaces of the polymer of the string members, the spacer, and the diagonal members through the spacers, and penetrating the washers, the string members, the spacer, and each diagonal member. By inserting the connecting shaft into each of the holes, and inserting a fixing bolt with a larger diameter than the shaft into the fixing hole in the center of the joint and tightening the nut, the washer, string material, spacer, and diagonal material are attached. It is characterized by being fastened and fixed together.

[Operation] The axial acting force acting on each chord member and diagonal member is concentrated at one point on the center line of the joint, so no moment is generated at the joint, and the twisting and twisting of the truss based on this moment is prevented. No deformation etc. will occur.

In addition, the string members and the diagonal members are engaged with each other by inserting connecting shaft rods into a plurality of connecting holes passing through them, and are tightened with a large diameter fixing bolt inserted through the center of the joint. Since it is fixed, the number of man-hours required for tightening bolts for fixing is reduced, and the assembly work is simple. Moreover, each connecting shaft rod only needs to have enough strength to engage the chord members and diagonal members with each other, and does not require as much strength as when tightening and fixing each member. The connecting holes formed in the shaft rod and each material can be made smaller, thereby suppressing a decrease in the strength of the connecting portion due to the formation of the connecting holes.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

The truss shown in FIG. 1 and FIG. It is composed of a diagonal member 3 that interconnects the intersection of the chord members 1a, 1b and the intersection of the chord members 2a, 2b, and these chord members 1a, 1b and 2
a, 2b and diagonal member 3 are each formed into lengths divided at each intersection, and are connected at each intersection in the following manner.

That is, FIGS. 3 and 4 show the structure of the joint between the upper lattice 1 and the diagonal member 3. At the ends of the vertical and horizontal chord members 1a, 1b and the diagonal member 3, which are made of pipes, flat connecting parts 4a, 4b and 5 are formed by crushing them, respectively, and two connecting parts 4a, 4b of the string members 1a, 1b are formed at a predetermined interval in the width direction. The connecting portion 5 of the diagonal member 3 is formed into a chevron shape, with holes 6a and 6b being drilled, and arc-shaped notches 7a and 7b that form a fixing hole at the center of the joint portion are cut in the center of the tip. For, 1
Two connecting holes 8 are bored, and an arcuate notch 9 forming a fixing hole is cut at the tip thereof.

The vertical chord members 1a, 1a and the horizontal chord members 1b, 1b are connected to connecting portions 4a, 4, respectively.
a, 4b, and 4b are arranged with their tips abutting each other, and two connecting holes 6a, 6b are provided.
are laid out in an intersecting manner so as to overlap each other, and at the intersection, diagonal members 3, 3, . They are arranged so as to be located on the same plane.

The spacer 10 is a rectangular seat plate 1 that abuts across the connecting parts 4b, 4b of the chord members 1b, 1b.
0a and the connection parts 5, 5,... of each diagonal member 3, 3,...
A rectangular seat plate 10b that abuts so as to straddle... is arranged and integrated so that their directions are different from each other by 45 degrees, and four connecting holes 11 corresponding to the connecting holes of each of the above materials are formed. One fixing hole 12 corresponding to the fixing hole is bored, and the spacer 10
are interposed between the chord members 1a, 1b and the diagonal member 3, as shown in
The axes of a, 1b and the diagonal member 3 are made to intersect at a point P on the center line l at the joint, and
When an external force in the axial direction is applied to these materials,
These acting forces are concentrated on the point P, thereby preventing the generation of moment at the joint.

Connecting portions 4a, 4a in the chord materials 1a, 1a
On the outer surface, there are four small-diameter connecting shaft rods 14 that are inserted into each of the connecting holes, and one large-diameter fixing bolt 15 that is inserted into a fixing hole formed at the center of the joint.
A rectangular fixed washer 16 with A rectangular receiving washer 18 common to each shaft rod, which has four connecting holes 19 corresponding to the shaft rod 14 and a fixing hole 20 corresponding to the fixing bolt 15, is attached to these connecting portions 5, 5. ,... By screwing the nut 22 onto the fixing bolt 15, the string members 1a, 1b, the spacer 10 and the diagonal member 3, are connected via these washers 16, 18.
3.... are tightened and fixed.

The above fixed washer 16 and each shaft rod 14 and bolt 15
Although they may be constructed as one body, they may be constructed separately and each shaft rod and bolt may be inserted through holes provided in the fixed washer 16.

In the truss having the above configuration, as shown in FIG.
Since it is concentrated at one point P on the top, no moment is generated at the joint. Therefore, twisting or deformation of the truss due to this moment is less likely to occur.

Further, the chord members 1a, 1b and diagonal member 3 are connected by a shaft rod 14 that passes through them, and a shaft rod 14 is provided separately from the shaft rod 14 so as not to penetrate each member 1a, 1b, and 3. Since it is tightened and fixed with the fixing bolt 15, each shaft rod 14 has
Great strength is not required when tightening and fixing each string member by itself, and moreover, each string member 1a, 1
The acting force acting on b or diagonal member 3 is evenly distributed from the shaft rod 14 passing through them to other shaft rods and materials via washers 16, 18 and spacer 10, which each shaft rod commonly passes through. It is supported and does not act intensively only on a specific shaft rod and material, so that the shaft rod 14, and thus the connecting portions 4a, 4b and 5 of each material 1a, 1b and 3, are formed. Connection hole 6
a, 6b, and 8 can be made smaller, thereby suppressing a decrease in the strength of the connecting portion due to the formation of the connecting hole.

Note that a bolt can also be used as the connecting shaft 14. In this case, each member is primarily tightened and fixed by the fixing bolts 15, so the bolts serving as the connecting shafts are not required to have a very large tightening force, and therefore small-diameter bolts are not required. Bolts can be used.

Furthermore, since the configuration of the joint between the lower lattice 2 and the diagonal members 3 is substantially the same as the configuration of the joint between the upper lattice 1 and the diagonal member 3 described above, a description thereof will be omitted to avoid duplication. do.

Although the number of chord members and diagonal members in the joints around the truss is smaller than the number of chord members and diagonal members in the intermediate joints described above, the missing parts of the chord members and diagonal members have the same shape as those connecting parts, By using spacers of the same thickness, bonding can be achieved in the same manner as described above.

[Effects of the Invention] As described above, according to the present invention, the following effects can be expected.

(1) By providing spacers between the vertical and horizontal chord members and diagonal members, the axes of these chord members and diagonal members are aligned at the center of the joint, which reduces the moment at the joint. Occurrence can be prevented.

(2) The chord members and the diagonal members are engaged with each other by inserting connecting shaft rods into the plurality of connecting holes that pass through them, and then tightened with a large-diameter fixing bolt inserted through the center of the joint. Since it is fixed, the number of man-hours required for tightening bolts, which require a large tightening force, is reduced, and the assembly work is simple.

In addition, the above-mentioned connecting shaft only needs to have enough strength to engage the chord members and diagonal members with each other, and is not required to have the strength to fasten and fix these materials. Since the diameter can be made small and, as a result, the connecting holes formed in each material can be made small, it is possible to prevent a decrease in the strength of each material due to the formation of the connecting holes.
Furthermore, even if the above-mentioned connecting shaft is made of bolts, the shaft does not require a large tightening force for fixing, so it can be easily tightened with just enough force to prevent the shaft from coming off. Moreover, since there is no need to strictly equalize the tightening force of each shaft rod, the tightening work is easy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an enlarged sectional view of the same essential part, and FIG. 4 is an exploded perspective view thereof. 1... Upper grid, 2... Lower grid, 1a, 1
b, 2a, 2b...chord material, 3...diagonal material, 10...
Spacer, 14... shaft rod, 15... fixing bolt, 16, 18... washer.

Claims (1)

[Claims] 1 Consists of an upper lattice and a lower lattice consisting of vertical and horizontal chords divided at each intersection, and diagonal members divided at each intersection that interconnect the intersections of the chords in both lattices, and these lattices and At the joint with the diagonal members, the vertical and horizontal chord members located in an intersecting state and each diagonal member located in abutting state on the same plane are made to intersect the axes of each member at a point on the center line at the joint part. A plurality of connections passing through these washers, the string members, the spacers, and each diagonal member are made by abutting washers on both the upper and lower outer surfaces of the polymer of the string members, spacers, and diagonal members. By inserting the connecting shaft rods into each hole, and inserting a fixing bolt with a larger diameter than the shaft rod into the fixing hole in the center of the joint and tightening the nuts, the washers, string members, spacers, and diagonal members are assembled. A truss characterized by being formed by tightening and fixing them together.