JP3349832B2 - Joint structure of steel pipe truss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a joint structure of a steel pipe truss used at a node of a large span structure constituting a space truss.

[0002]

2. Description of the Related Art Recently, general steel truss structures mainly composed of steel pipes and assembled by field welding have been widely used. Since these truss structures form relatively large structures, at the nodes, a plurality of truss bars are concentrated on the axis of the relatively long main truss bars. They will be joined radially.

[0003] Conventionally, there is a joint structure of a steel pipe truss at the above-mentioned node as shown in FIG. The joint structure of the steel pipe truss is a joint member 2 having ring-shaped stiffeners 21 provided on both sides of a connecting rod 20 made of a steel pipe.
2 is provided. Each of the stiffeners 21 of the node member 22 is butt-welded to a pair of truss rods 23 which concentrically face each other and constitute a main member. One side of the plurality of connecting plates 24 is radially welded to the peripheral surface 20a of the connecting rod 20, and one side O on the axis of the pair of truss rods 23 is provided on the other side of each of the connecting plates 24.
The end of the radial truss rod 25 converging at the center is fixed.

For this reason, between the truss rods 23, the axial force acting on one truss rod 23 is transmitted linearly in the axial direction of the connecting rod 20 via the stiffener 21, and then via the other stiffener 21. To the other truss rod 23. Further, between the truss rods 25, the axial force acting on one truss rod 25 is transmitted in a curved manner in the circumferential direction of the connecting rod 20 via the engaging plate 24, and then transmitted to the other truss rod 25. .

[0005]

However, in the above-mentioned conventional joint structure of a steel pipe truss, the truss rod member 25 is used.
Considering the transmission of the axial force between the connecting rods 20, when the connecting rod 20 receives an axial force from one of the truss rods 25 via the engaging plate 24, the connecting rod 20 is compressed in the radial direction where the axial force acts. Therefore, it is difficult for the axial force to be directly transmitted to the other truss rod 25. Further, there is a possibility that local buckling may occur on the side wall itself of the connecting rod 20 that has received the axial force. Therefore, the truss rod 23
As in the case of the truss rods, it is necessary to reinforce the connecting rods 20 by increasing the thickness of the connecting rods 20 in order to transmit the axial force between the truss rods 25 without causing buckling failure. Become. Further, since the connecting rod 20 has substantially the same diameter as the truss rod 23 and its peripheral surface 20a has a small curvature, the connecting plate 24 for the truss rod 25 at the construction site.
It is difficult to align the truss rod 25 with the connecting rod 20 in the axial direction of the peripheral surface 20a.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve the efficiency of centering work at a construction site and to smoothly transmit an axial force between truss rods. It is in.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a pair of truss rods constituting a main member are joined to each other concentrically via a node member. Then, in the joint structure of the steel pipe truss in which a plurality of truss rods are radially joined to the joint member, the joint member is formed by opposing a single core member formed in a straight rod shape and both sides of the core member. A pair of support plates joined together,
A cover tube attached between the inside of the support plate and covering the core, and the pair of truss rods are butt-welded to the outside of the support plate concentrically with the core, respectively, and the cover One side of a plurality of connecting plates is radially welded to the peripheral surface of the core material through the pipe, and these connecting plates and the support plate and the cover pipe are welded to each other, and the other side of the connecting plate is welded. 3. A fitting part in which the radial truss rods are respectively fixed, and the pair of truss rods are fitted outside the support plate and concentrically with the core material, respectively, as described in claim 2. Is protruding.

Further, according to the present invention, a pair of truss rods constituting a main member are joined concentrically to each other via a node member, and a plurality of truss rod members are connected to the node member. In the joint structure of the steel pipe truss radially joined, the node member is constituted by one core material formed in the shape of a straight rod, and one side of a plurality of connecting plates is radially formed on the peripheral surface of the core material. Welding and fixing the radial truss rods to the other side of the fitting plate, and fitting the support plates through which both sides of the core are inserted into one side of the pair of truss rods, respectively. Then, the insertion portions of these support plates are respectively formed in fitting holes for fitting the core material concentrically with the pair of truss rods, and the core materials are fitted in these fitting hole portions, respectively. When the support plate is welded to the core material, The cover tube covering the core material is formed by inserting a cover plate having an arc-shaped cross section for each of the fitting plates, and welding these cover plates to the fitting plate and the pair of truss rods, respectively. According to a fourth aspect of the present invention, each of the support plates has a fitting portion protruding concentrically from one side of the truss rod to be fitted with the cover tube.

[0009]

According to the structure of the first aspect, when the truss rods are butt-welded to the other sides of the pair of support plates concentrically with the cores, respectively, the pair of truss rods are concentric with each other. They face each other in the axial direction via the core material. Further, since the core is formed to have a smaller diameter than the diameter of the pair of truss rods, and one side of the joint plate is welded to the peripheral surface of the core along the axial direction of the core, a plurality of joint plates are formed. When radially welded to the peripheral surface of the core, the radial truss rods respectively fixed to the other side of these mounting plates are each centered with respect to the core. Then, the axial force acting on one of the truss rods is transmitted to the other truss rods via the core. In this case, the support plate and the connecting plate are connected via the cover tube to make the cover tube work as a structural member, and the cover tube is involved in the transmission of the axial force.

According to the second aspect of the present invention, the truss rods are fitted into the fitting portions of the pair of support plates, respectively, and the pair of truss rods are concentric with each other. To the other side. Then, the support plate and the truss rod are welded with the fitting portion as a backing material.

According to the third aspect of the present invention, when both sides of the core are fitted into the fitting holes of the support plate and the support plate is welded to the core, the pair of truss bars are mutually connected. Concentrically oppose each other in the axial direction via the core material.
Further, since the core is formed to have a smaller diameter than the diameter of the pair of truss rods, and one side of the joint plate is welded to the peripheral surface of the core along the axial direction of the core, a plurality of joint plates are formed. When radially welded to the peripheral surface of the core, the radial truss rods respectively fixed to the other side of these mounting plates are each centered with respect to the core. Then, the axial force acting on one of the truss rods is transmitted to the other truss rods via the core. In this case, the pair of truss rods and the connecting plate are connected via a cover tube to make the cover tube function as a structural member, and the cover tube is involved in the transmission of the axial force.

Further, according to the configuration of the fourth aspect, each of the cover tubes is fitted to the fitting portion of the support plate,
One side of the truss rod is abutted on each side of the cover tube. Then, the cover tube and the truss rod are welded using the fitting portion as a backing material.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1A is a partial cross-sectional front view showing a joint structure of a steel pipe truss, FIG. 2B is a cross-sectional view showing a modification of the cross-sectional portion of FIG. 1A, and FIG. FIG. 3 is a front view showing a use state of the joint structure of the steel pipe truss shown in FIG. 1.

In these figures, reference numeral 1 denotes a single core member (whether solid or hollow) formed in the shape of a straight bar having a circular cross section. Support plates 2 are welded to both sides of the core member 1, respectively. The insides of the pair of support plates 2 face each other with the core 1 interposed therebetween.

The support plate 2 is formed in the shape of a circular plate slightly larger in diameter than the truss rod 4 to be described later, and the outside of the support plate 2 is formed on a joint surface 2 a perpendicular to the center line of the core 1. A fitting portion 2b for fitting a pair of truss rods 4 made of a steel pipe constituting a main member is provided on the joint surface 2a so as to project concentrically with the core 1.

Each of the fitting portions 2b has a truss rod 4
And the pair of truss rods 4 are butt-welded to the joint surface 2 a of the support plate 2.

On the peripheral surface 1a of the core 1 at the center between the inner sides of the support plates 2, a mounting plate 3 serving as a partition plate is welded to a mounting plate 5 described later. As will be described later, a cover tube 8 that covers the core 1 is attached between the inside of the support plate 2 in a state where the cover tube 8 is divided into two in the axial direction by the mounting plate 3, and penetrates the cover tube 8 to surround the core 1. One side of the plurality of connecting plates 5 is radially welded to the surface 1a. Radial truss rod members 6 each made of a steel pipe are fixed to the other side of these connecting plates 5. In addition, as shown in FIG. 1 (2), it is preferable that a receiving portion 2b for positioning the cover tube 8 concentrically with the core material 1 is protruded inside the support plate 2.

More specifically, the cover tube 8 is formed by welding one side of a plurality of joint plates 5 to the peripheral surface 1a of the core member 1 along the axial direction of the core member 1, and a cross section is provided for each of the joint plates 5. The cover plate 7 is formed by inserting an arc-shaped cover plate 7 and welding the cover plate 7 to the support plate 2, the engagement plate 3, and the engagement plate 5.

The cover tube 8 is reinforced by a support plate 2 and a mounting plate 3 that cover the cross section thereof, and a mounting plate 5 that connects the peripheral surface 1a of the core material 1 to the peripheral surface 8a of the cover tube 8. This increases the rigidity of the cover tube 8. If the rigidity of the cover tube 8 is sufficient as described above, one side of the joint plate 15 is welded to the peripheral surface 8a of the cover tube 8 as shown by an imaginary line in FIG. The truss rod 6 can also be fixed to the side with bolts and nuts.

The node member 9 joins the pair of truss rods 4 and the radial truss rod 6, and is composed of a core 1, a support plate 2, a fitting plate 3, and a cover tube 8. As described above, a pair of truss rods 4 are concentrically and axially opposed to each other outside the support plate 2 and joined to each other. The rod 6 is joined. The connecting plate 3 is used to improve the connection when the radial truss rods 6 intersect in the V-shape or the like with respect to the axial direction of the core 1, and intersect at right angles to the axial direction of the core 1. It is unnecessary at times.

The joint structure of the steel pipe truss is used, for example, as shown in FIG. 3, for joining the column member 10 and the lower chord member 11 and the web member 12 of the truss frame member T supported by the column member. In this case, a pair of truss bars 4 concentrically opposed to each other in the axial direction become the lower chord members 11, and the radial truss bars 6 become the abdominal members 12 and the column members 10. The inside of the support plate 2 that connects the pair of lower chords 11 that face each other in the axial direction is covered with the cover tube 8, and the same appearance as the lower chord 11 is maintained.

In the above configuration, the pair of support plates 2
The truss rods 4 are fitted into the fitting portions 2b of the support plate 2 so that the pair of truss rods 4 are concentric with the core 1 respectively.
To the joint surface 2a. Then, the support plate 2 and the truss rod 4 are welded by using the fitting portion 2b as a backing material. Thus, the joining surface 2a of the pair of support plates 2
When the truss rods 4 are butt-welded to each other, the pair of truss rods 4 concentrically oppose each other in the axial direction via the core 1.

Further, since the core 1 is formed to have a smaller diameter than the diameter of the truss rod 4, and the connecting plate 5 can be welded to the peripheral surface 1a of the core 1 along the axial direction of the core 1, When one side of the connecting plate 5 is radially welded to the peripheral surface 1a of the core 1 and the ends of the radial truss bars 6 are fixed to the other side of the connecting plate 5, these truss bars 6 It is centered on the core material 1.

Then, as described above, the pair of truss rods 4
And the center line of the radial truss rod 6 intersects at one point O on the center line of the core 1, and the axial force applied to one of the truss rods 4 or 6 is applied to the other truss rod via the core 1. To be transmitted. In this case, the support plate 2, the mounting plate 5, and the mounting plate 3 are connected via the cover tube 8 so that the cover tube 8 works as a structural member, and the cover tube 8 participates in the transmission of the axial force.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a sectional view showing the joint structure of the steel pipe truss. The same parts as those in the first embodiment are denoted by the same reference numerals.

The second embodiment differs from the first embodiment in that the support plate 2 is provided not on the node member 9 but on one side of the pair of truss rods 4.

The joint member 16 is composed of the core 1, and one side of a plurality of joint plates 5 is radially welded to the peripheral surface 1 a of the core 1, respectively.
On the other side, radial truss rod members 6 are fixed. Also, inside each side of the pair of truss rods 4,
The support plates 17 into which both sides of the core 1 are inserted are fitted and welded, and the insertion portions of these support plates 17 each have a fitting hole 18 for fitting the core 1 concentrically with the pair of truss rods 4. Is formed. The support plate 17 has a cover tube 8 projecting concentrically from one side of the truss rod 4.
Is formed. Both sides of the core 1 are fitted into the fitting holes 18, respectively.
Is welded to the support plate 17. Further, a cover tube 8 that covers the core 1 is welded to the joint plate 5 and the truss rod 4 respectively.

In the above configuration, when the support plate 17 is welded to the core 1 by fitting both sides of the core 1 into the fitting holes 18 of the support plate 17, the pair of truss rods 4 are concentric with each other. 1 are opposed to each other in the axial direction. Further, since the core 1 is formed to have a smaller diameter than the pair of truss rods 4 and one side of the joint plate 5 is welded to the peripheral surface 1a of the core 1 along the axial direction of the core 1, When the connecting plates 5 are radially welded to the peripheral surface 1a of the core 1, the radial truss rods 6 respectively fixed to the other side of the connecting plates 5 are centered with respect to the core 1. The axial force applied to one of the truss rods 4 or 6 is transmitted to other truss rods via the core 1. In this case, the pair of truss rods 4 and the connecting plates 3 and 5 are connected via the cover tube 8 so that the cover tube 8 works as a structural member, and the cover tube 8 is involved in the transmission of the axial force.

Further, the cover tubes 8 are fitted into the fitting portions 19 of the support plate 17, respectively, and one side of the truss rod 4 is abutted on each side of the cover tube 8. Then, the cover tube 8 and the truss rod 4 are welded with the fitting portion 19 as a backing material.

[0032]

As described above, according to the present invention, as described in claim 1, a pair of truss rods constituting the main member are joined to each other concentrically via the node members, and a plurality of truss rod members are connected to the node members. In the joint structure of the steel pipe truss in which the truss rod members are radially joined, the joint member is formed by a single core member formed in a straight rod shape and a pair of support plates which are oppositely coupled to both sides of the core member. And a cover tube attached between the inside of the support plate and covering the core material, and the pair of truss rod members are butt-welded to the outside of the support plate concentrically with the core material, respectively, and One side of each of a plurality of joint plates is radially welded to the peripheral surface of the core material through the cover tube, and the joint plate and the support plate are welded to the cover tube. Since the radial truss rods are fixed to each side, when the truss rods are butt-welded concentrically to the outside of the support plate, these truss rods are centered with respect to the core and are opposed to each other in the axial direction. Can be.
Also, the core is formed to have a diameter smaller than the diameter of the truss rod,
Since the joint plates can be welded to the peripheral surface of the core along the axial direction of the core, a plurality of joint plates are radially welded to the peripheral surface of the core, and the opposed truss rods are respectively attached to these joint plates. When the ends of the truss rods different from the material are fixed, each of these truss rods can be centered with respect to the core. Therefore, the centering work is easy at the construction site, and the efficiency of the joining work can be improved. In particular, as described in claim 2, in the case where fitting portions for fitting the pair of truss rods concentrically with the core material are provided on the outside of the support plate, respectively, Each truss rod is fitted to the fitting portion, and these truss rods are respectively butted against the joint surface of the support plate concentrically with the core material, and these support plates and the truss rod material are placed behind the fitting portion. Since it can be welded as a patch, the efficiency of the centering and joining work can be further improved.

According to a third aspect of the present invention, a pair of truss rods constituting a main member are joined to each other concentrically via a node member, and a plurality of truss rod members are connected to the node member. In the joint structure of the steel pipe truss radially joined, the node member is constituted by one core material formed in the shape of a straight rod, and one side of a plurality of connecting plates is radially formed on the peripheral surface of the core material. Welding and fixing the radial truss rods to the other side of the fitting plate, and fitting the support plates through which both sides of the core are inserted into one side of the pair of truss rods, respectively. Then, the insertion portions of these support plates are respectively formed in fitting holes for fitting the core material concentrically with the pair of truss rods, and the core materials are fitted in these fitting hole portions, respectively. When the support plate is welded to the core material, In order to cover tube for covering the core, said insert the tie plate arcuate cross section of the cover plate for each were formed by welding to these cover plates and each said tie plates and said pair of truss 杆材,
When a core material is fitted into each of the fitting holes of the support plate and the support plate is welded to the core material, the pair of truss rods can be axially opposed to each other concentrically. Further, since the core is formed to have a smaller diameter than the diameter of the pair of truss rods, and one side of the joint plate is welded to the peripheral surface of the core along the axial direction of the core, a plurality of joint plates are formed. When radially welded to the periphery of the core, additional truss rods, each secured to the other side of these mounting plates, can be centered relative to the core. Therefore, the centering work is easy at the construction site, and the efficiency of the joining work can be improved. In particular, as described in claim 4, when the support plate is provided with a fitting portion that protrudes concentrically from one side of the truss rod material and into which the cover tube is fitted, the support plate is provided. Cover tubes are fitted into the fitting portions of the truss rods, and one side of each truss rod is abutted on both sides of the cover tubes, and these cover tubes and the truss rods are welded using the fitting portions as backing materials. Therefore, the efficiency of the centering and joining operations can be further improved.

In any one of the first and third aspects of the present invention, the center lines of the plurality of truss rods intersect at one point on the center line of the core, and The axial force applied to the truss rod can be transmitted to other truss rods through the core.
The support plate and the connecting plate can be connected via a cover tube, so that the cover tube acts as a structural member, and this cover tube can participate in the transmission of the axial force. Therefore, the axial force can be smoothly transmitted between the truss rods as compared with the related art in which only the connecting rod substantially corresponding to the cover tube is provided.

[Brief description of the drawings]

FIG. 1A is a front view of a partial cross section showing a joint structure of a steel pipe truss according to a first embodiment of the present invention. (2) It is sectional drawing which shows the modification of the cross-section part of (1).

FIG. 2 is a sectional view taken along line AA of FIG. 1 (1).

FIG. 3 is a front view showing a use state of the joint structure of the steel pipe truss shown in FIG. 1;

FIG. 4 is a sectional view showing a joint structure of a steel pipe truss according to a second embodiment of the present invention.

FIG. 5 is a front view showing a joint structure of a conventional steel pipe truss.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 1a Peripheral surface 2 Support plate 2a Joining surface (outside) 2b Fitting part 4 Truss rod 5 Connecting plate 6 Truss rod 7 Cover plate 8 Cover tube 9 Node member 16 Node member 17 Support plate 18 Fitting hole 19 Fitting portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-87332 (JP, A) JP-A-55-48915 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/19 E04B 1/38-1/61 E04C 3/00-3/46

Claims (4)

(57) [Claims] 1. A joint structure of a steel pipe truss in which a pair of truss rod members constituting a main member are concentrically joined to each other via a node member, and a plurality of truss rod members are radially joined to the node member. A core member formed in the shape of a straight rod, a pair of support plates coupled to both sides of the core member facing each other, and a cover attached between the insides of the support plates to cover the core member And a pair of truss rods butt-welded to the outside of the support plate concentrically with the core material, and a plurality of fittings are provided on the peripheral surface of the core material through the cover tube. One side of the plate is radially welded to each other, the connecting plate and the support plate are welded to the cover tube, and the radial truss rods are fixed to the other side of the connecting plate. Joint structure of steel pipe truss. 2. The joint portion of a steel pipe truss according to claim 1, wherein fitting portions for fitting said pair of truss rods are provided protrudingly outside said support plate and concentrically with said core material. Construction. 3. A joint structure of a steel pipe truss in which a pair of truss rod members constituting a main member are concentrically joined to each other via a node member, and a plurality of truss rod members are radially joined to the node member. The node member is constituted by a single core material formed in a straight rod shape, one side of a plurality of joint plates is radially welded to a peripheral surface of the core material, and the radial members are respectively welded to the other side of the joint plate. The truss rods are fixed, and each of the pair of truss rods is fitted and welded with a support plate through which both sides of the core are inserted, on one side,
Each of the insertion portions of these support plates is formed in a fitting hole portion that fits the core material concentrically with the pair of truss rod materials,
The core material is fitted into each of the fitting holes, the support plate is welded to the core material, and a cover tube covering the core material is inserted into the cover plate having an arc-shaped cross section for each of the fitting plates. The joint structure of the steel pipe truss, wherein the cover plate is formed by welding to each of the connecting plate and the pair of truss rods. 4. The steel pipe truss according to claim 3, wherein each of said support plates has a fitting portion projecting concentrically from one side of said truss rod material and fitting said cover tube into said fitting portion. Joint structure.