Web member used for truss and having high cross-sectional strength, and assembled truss

Abstract

The present utility model provides a web member used for a truss and having high cross-sectional strength, and an assembled truss. For said web member, an M-shaped web member is skillfully subjected to end portion transformation, recess cutting, and hole forming, and, without increasing the amount of steel used, end portions are transformed into two double-layer connecting plates used for connection. In conventional truss connecting nodes, the strength of a cross-section is typically not sufficient due to being controlled by the load-bearing capacity of a bolt. However, due to flattening, the thickness of a bolt connection point of an end portion of the web member is increased, and the pressure-bearing and load-bearing capacity of the bolt are greatly improved. The truss in the present utility model is a fully bolted truss. A joint between two adjacent web members and a chord member is connected to the intersection point of the centers of gravity of the web members and the chord member, thus preventing the production of a secondary bending moment of the chord member at the node. The load-bearing capacity of the truss is further improved, such that a smaller cross-sectional area is able to bear a greater load. In addition, the quality and economical efficiency are greatly improved.

Description

A web member for trusses with high continuous cross-section strength and assembled trusses Technical Field

[0001] The utility model relates to the technical field of steel structure buildings, in particular to an assembled truss. Background Art

[0002] Most of the rods in a truss are subjected to axial tension or compression, which fully utilizes the strength of the material. When the span is large, it can save material compared to solid-web beams, reduce deadweight, and increase rigidity. It is especially widely used and promoted in engineering projects with large spans or loads and strict deformation requirements. Traditional truss production is assembled after assembly through a specific welding process according to different weld forms. The materials used are all ordinary construction steel plates. For corrosion protection reasons, after assembly, they are rust-proofed and painted before leaving the factory. Welding and painting produce a large amount of harmful gases, and the quality is not easy to guarantee. The corrosion protection after painting also has a certain lifespan and requires regular maintenance. Another form also uses bolt connections. The chord is installed in two pieces. The rods are scattered, which is prone to lateral bending of the truss. The web and chord are connected as independent connection nodes. Secondary bending moments are easily generated at the connection nodes, increasing structural stress, reducing the load-bearing capacity of the truss, and reducing the structural safety of the entire building. In addition, the number of bolts is large, which reduces the economic efficiency.

[0003] Utility Model Content

[0004] The purpose of the utility model is to provide a truss web member and an assembled truss with high cross-sectional strength, so as to solve the problem in the background art that the existing assembled trusses are prone to produce secondary bending moments at the connection nodes, which increases the structural stress and reduces the bearing capacity of the truss.

[0005] To achieve the above-mentioned purpose, the utility model proposes a web member for a truss with high cross-sectional strength. The web plate is grooved at the end of the web member and then flattened toward the end plates on both sides, so that the end plates on both sides form a double-layer connecting plate, and bolt holes for connection are provided on the surface of the double-layer connecting plate.

[0006] Furthermore, the middle section of the web is M-shaped.

[0007] The utility model also provides a fully bolted assembled truss, comprising an upper chord, a lower chord and a plurality of web members;

[0008] The upper chord and the lower chord are arranged in parallel, and the cross-section of the upper chord and the lower chord is an Ω cross-section shape, with a protrusion in the middle for connecting to the web; connecting bolt holes are provided at equal intervals on the side surfaces of the protrusion, and the protrusion is clamped between the double-layer connecting plates on both sides of the web and fixedly connected by bolts.

[0009] Furthermore, a plurality of the web members are connected end to end and arranged in order between the upper chord and the lower chord, and the ends of two adjacent web members are connected to the same bolt node of the upper chord or the lower chord;

[0010] The double-layer connection plates of two adjacent web members at the same bolt node are placed in an inner and outer staggered manner.

[0011] Furthermore, the truss is fixed by support assemblies and roof beams.

[0012] Further, the support assembly includes a support and an end support connector;

[0013] The support is fixed on the roof beam, and the end support connector is two L-shaped steel plates symmetrically arranged on the surface of the support and fixed to the support by bolts;

[0014] The protrusion at the end of the upper chord is clamped between the two end support connectors and fixed by bolts.

[0015] Furthermore, a trapezoidal groove matching the vertical cross-sectional shape of the protrusion is formed between the two end support connectors.

[0016] Furthermore, the end of the lower chord is overlapped with the lower flange of the roof beam.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The present invention cleverly transforms the M-shaped web into two double-layer connecting plates through end transformation, grooving, and hole making. Conventional truss connection nodes are usually controlled by the load-bearing capacity of the bolts, but the strength of the cross-section is never sufficient. However, flattening increases the thickness of the bolt connection at the end of the web, which greatly improves the pressure bearing capacity of the bolts.

[0019] 2. The entire truss is connected by full bolts, which reduces the important welding process and makes it easier to ensure the quality. The mechanized assembly line operation reduces the requirements for the workers' professional level in component processing and manufacturing.

[0020] 3. The truss with full bolt connection can be made of fully galvanized materials, including galvanized bolts, which reduces the painting process, further improves the economy, and greatly increases the anti-corrosion life; the junction of the two webs and the chord is connected at the intersection of the center of gravity of the web and the chord, avoiding the generation of secondary bending moment of the chord at the node, further improving the bearing capacity of the truss, so that a smaller cross-sectional area can carry a larger load; the quality and economy are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the overall structure of an assembled truss in an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the three-dimensional structure of the belly rod in the embodiment of the present utility model;

[0023] FIG3 is a schematic diagram of the assembly structure of the web member and the chord member in an embodiment of the present invention;

[0024] FIG4 is a schematic diagram of the assembly of two adjacent web members and a chord member at the same node in an embodiment of the present invention;

[0025] FIG5 is a schematic diagram of the assembly structure of the chord rod and the roof beam in the embodiment of the present utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0027] As shown in FIG1 , the present invention provides an assembled truss, comprising an upper chord 1 , a lower chord 2 and a plurality of web members 3 ;

[0028] The upper chord 1 and the lower chord 2 are arranged in parallel. The cross-section of the upper chord 1 and the lower chord 2 is an Ω cross-section shape as shown in Figure 4. The flanges at both ends of the upper chord 1 and the lower chord 2 are deflected at a certain angle in the vertical direction. The middle part of the upper chord 1 and the lower chord 2 is a protrusion 4 for connecting to the web member 3. Connecting bolt holes are opened at equal intervals on the side of the protrusion 4. The bolt holes are used to connect to the web member 3. The bolt holes at the end are used to connect to the support connector as shown in Figure 5.

[0029] In the present invention, the structure of the web is designed to achieve the characteristic of high strength of the connecting section. As shown in FIG2 , in this embodiment, the web member 3 is an M-shaped web member 3. The ends of the web member 3 are grooved in the web and then flattened toward the end plates on both sides, so that the end plates on both sides form a double-layer connecting plate 31. The surface of the double-layer connecting plate 31 has bolt holes for connection. The above-mentioned structural design increases the thickness of the bolt connection at the end of the web member 3, and the pressure bearing capacity of the bolt will be greatly improved. For example, an M10 ordinary bolt with a grade of 8.8S, when the connecting material is Q355, the bearing capacity of the 2mm plate bolt is 10.20kN. When the plate thickness is 4mm, the bearing capacity of the bolt will reach 20.40kN. That is, through the flattening process, the bearing capacity of the bolt is doubled, and a thinner plate can be used to produce a greater bearing capacity. It is worth mentioning that the middle part of the M-shaped web member 3 can also adopt an arc-shaped web.

[0030] Specifically, the connection method of the web members 3 and the chord members is shown in FIG1 . Multiple web members 3 are connected end to end and arranged in an orderly manner between the upper chord member 1 and the lower chord member 2. As shown in FIG3 , the protrusions 4 are clamped between the double-layer connecting plates 31 on both sides of the web. Bolts are inserted into the pre-set through holes on the web members 3 and the chord members to achieve connection and fixation. The ends of two adjacent web members 3 are connected to the same bolt node of the upper chord member 1 or the lower chord member 2; the double-layer connecting plates 31 of two adjacent web members 3 at the same bolt node are staggered inside and outside. This allows the junction of the two web members 3 and the chord member to be connected at the intersection of the center of gravity of the web member 3 and the chord member, avoiding the generation of secondary bending moments of the chord member at the node, further improving the bearing capacity of the truss, and thus allowing a smaller cross-sectional area to carry a larger load; the quality and economy are greatly improved.

[0031] In this embodiment, the connection between the truss and the roof beam 5 is shown in Figure 5. The truss is secured to the roof beam 5 via a support assembly. The support assembly consists of a support 6 and an end support connector 7. The support 6 is secured to the roof beam 5. The end support connector 7 is composed of two L-shaped steel plates symmetrically arranged on the surface of the support 6 and secured to the support 6 via bolts. The protrusion 4 at the end of the top chord 1 is clamped between the two end support connectors 7 and secured via bolts.

[0032] In this embodiment, a trapezoidal groove is formed between the two end support connectors 7 to match the vertical cross-sectional shape of the protrusion 4, so that the side surfaces of the protrusion 4 also play a certain supporting role, ensuring the overall force effect. The end of the bottom chord 2 overlaps the lower flange of the roof beam 5.

[0033] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other variation to the technical solution and technical content disclosed herein shall be deemed to fall within the scope of the present invention and remain within the scope of protection of the present invention.

Claims

1. A web member for a truss with high cross-sectional strength, characterized in that: The web plate is grooved at the end of the web rod and then flattened toward the end plates on both sides, so that the end plates on both sides form double-layer connecting plates, and bolt holes for connection are arranged on the surface of the double-layer connecting plates.

2. The web member for a truss with high cross-sectional strength according to claim 1, characterized in that: The middle section of the web is M-shaped.

3. A fully bolted assembled truss, characterized in that: A truss web member with high cross-sectional strength as claimed in any one of claims 1 to 2, comprising an upper chord, a lower chord and a plurality of web members; The upper chord and the lower chord are arranged in parallel, and the cross-section of the upper chord and the lower chord is an Ω cross-section shape, and the middle part is a protrusion for connecting the web; connecting bolt holes are opened at equal intervals on the side of the protrusion, and the protrusion is clamped between the double-layer connecting plates on both sides of the web and fixedly connected by bolts.

4. The fully bolted assembled truss according to claim 3, characterized in that: A plurality of web members are connected end to end and are arranged in order between the upper chord and the lower chord, and ends of two adjacent web members are connected to the same bolt node of the upper chord or the lower chord; The double-layer connection plates of two adjacent web members at the same bolt node are placed in an inner and outer staggered manner.

5. The fully bolted assembled truss according to claim 3, characterized in that: The trusses are fixed by support assemblies and roof beams.

6. The fully bolted assembled truss according to claim 5, characterized in that: The support assembly includes a support and an end support connector; The support is fixed on the roof beam, and the end support connector is two L-shaped steel plates symmetrically arranged on the surface of the support and fixed to the support by bolts; The protrusion at the end of the upper chord is clamped between the two end support connectors and fixed by bolts.

7. The fully bolted assembled truss according to claim 6, characterized in that: A trapezoidal groove matching the vertical cross-sectional shape of the protrusion is formed between the two end support connectors.

8. The fully bolted assembled truss according to claim 5, characterized in that: The end of the lower chord is overlapped with the lower flange of the roof beam.

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