CN220035175U

CN220035175U - Open truss structure

Info

Publication number: CN220035175U
Application number: CN202321538190.3U
Authority: CN
Inventors: 东宇; 胡茸茸; 周雄
Original assignee: Shaanxi Road & Bridge Co ltd
Current assignee: Shaanxi Road & Bridge Co ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2023-11-17
Anticipated expiration: 2033-06-16

Abstract

The utility model discloses an open truss structure, belongs to the field of bridge construction, and solves the problems that an existing open truss is easy to occur out-of-plane instability of an upper chord and is easy to occur overall transverse instability of the open truss. The two single trusses are arranged in parallel. The upper chord and the lower chord are arranged in parallel. A plurality of vertical web members are fixed between the upper chord member and the lower chord member, and are arranged at equal intervals along the length direction of the upper chord member. And an inclined web member is fixed between every two adjacent vertical web members. The arrangement positions of each cross beam are respectively in one-to-one correspondence with the vertical web members, and the two ends of each cross beam are respectively connected with the vertical web members at the corresponding positions. Two brackets are respectively arranged below each cross beam and are positioned at two ends of the cross beam. The bracket is triangular, the end face of the first side of the triangle is fixed with the lower end of the cross beam, and the end face of the second side of the triangle is fixed with the vertical web member. The utility model can increase the critical load of lateral instability of the upper chord member and reduce the risk of overall lateral instability of the open truss.

Description

Open truss structure

Technical Field

The utility model relates to the technical field of bridge construction, in particular to an open truss structure.

Background

The open truss is a truss structure with the upper parallel connection removed, and is widely applied to the upper structures of highways, railways, ports and pavements due to the advantages of small building height, large clearance below the structure, simple overall bridge structure and the like.

Open trusses are often used as load bearing structures for overpasses that are not only to bear traffic loads on the deck, but also to bear other types of loads across the underbridge line, such as pipes, electrical circuits, etc. For open trusses using light steel, the presence of such loads increases the risk of buckling failure of the open truss. Meanwhile, the upper parallel connection is removed from the open truss, so that a U-shaped open frame is integrally formed, and transverse instability is easy to occur. In addition, because the upper chord is not laterally supported, the out-of-plane behavior of the upper chord is restrained only through the out-of-plane rigidity of the vertical web member under the action of external load, and therefore the upper chord is easy to be subjected to out-of-plane instability. Similarly, the upper chord member lacking the lateral support serves as the top constraint of the vertical web member, the lateral deflection is larger, the vertical web member is easy to bend and unstably damage, and according to the structural stability theory, the speed of the whole truss structure in the whole transverse instability is accelerated after the member members forming the truss structure are unstably.

Disclosure of Invention

The embodiment of the utility model solves the problems that the existing open truss is easy to generate out-of-plane instability of an upper chord and the open truss is easy to generate integral transverse instability by providing the open truss structure.

The embodiment of the utility model provides an open truss structure, which comprises two single trusses, a cross beam and brackets; the two single trusses are arranged in parallel; the single truss comprises a lower chord member, an upper chord member, a vertical web member and an inclined web member; the upper chord member and the lower chord member are arranged in parallel; a plurality of vertical web members are fixed between the upper chord member and the lower chord member, and are arranged at equal intervals along the length direction of the upper chord member; one inclined web member is fixed between every two adjacent vertical web members; a plurality of cross beams are arranged between the two single trusses; the arrangement positions of the cross beams are respectively in one-to-one correspondence with the vertical web members, and the two ends of each cross beam are respectively connected with the vertical web members in the corresponding positions; two brackets are respectively arranged below each cross beam and are respectively positioned at two ends of the cross beam; the bracket is triangular, the end face of the first side of the triangle is fixed with the lower end of the cross beam, and the end face of the second side of the triangle is fixed with the vertical web member.

In one possible implementation, the cross member is fixed in the middle of the vertical web member.

In one possible implementation, the open truss structure further comprises a stringer; a plurality of small longitudinal beams are arranged between every two adjacent cross beams, and the small longitudinal beams are arranged at intervals along the length direction of the cross beams.

In one possible implementation, the top of the side sill and the top of the cross member coincide.

In one possible implementation, the cross-sectional width of the upper chord, the cross-sectional width of the riser web, and the cross-sectional width of the lower chord are all equal.

In one possible implementation, the open truss structure further comprises guys; a plurality of inhaul cables are arranged between the two single trusses, and the inhaul cables are arranged at intervals along the length direction of the single trusses; both ends of each inhaul cable are fixed with the lower chord member.

In one possible implementation manner, two sides of each bracket are respectively provided with one inhaul cable, and two ends of each inhaul cable are fixed with the lower chord member.

One or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:

the embodiment of the utility model provides an open truss structure, which comprises two single trusses, a cross beam and brackets. The two single trusses are arranged in parallel. The single truss comprises a lower chord member, an upper chord member, a vertical web member and a diagonal web member. The upper chord and the lower chord are arranged in parallel. A plurality of vertical web members are fixed between the upper chord member and the lower chord member, and are arranged at equal intervals along the length direction of the upper chord member. And an inclined web member is fixed between every two adjacent vertical web members. A plurality of cross beams are arranged between the two single trusses. The arrangement positions of each cross beam are respectively in one-to-one correspondence with the vertical web members, and the two ends of each cross beam are respectively connected with the vertical web members at the corresponding positions. Two brackets are respectively arranged below each cross beam and are respectively positioned at two ends of the cross beam. The bracket is triangular, the end face of the first side of the triangle is fixed with the lower end of the cross beam, and the end face of the second side of the triangle is fixed with the vertical web member. The utility model has reasonable structural form, excellent mechanical property and more convenient construction, the open truss forms a middle-bearing open truss through upward movement of the cross beam, and meanwhile, the bracket is arranged to strengthen the node and support the cross beam so as to increase the out-of-plane bearing capacity of the structure, so that the stress of the open truss structure is more reasonable, the structural bearing capacity of the open truss is improved, the critical load of lateral instability of an upper chord is increased, the risk of overall lateral instability of the open truss is reduced, and the breakthrough of the span of the open truss structure is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments of the present utility model will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an open truss structure according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an open truss structure according to an embodiment of the present utility model;

FIG. 3 is a schematic view of section 1/2 at A-A in FIG. 2;

fig. 4 is a schematic structural view of an open truss structure according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of an open truss structure according to an embodiment of the present utility model.

Icon: 1-a single truss; 11-bottom chords; 12-upper chords; 13-vertical web members; 14-diagonal web members; 2-a cross beam; 3-corbels; 4-small longitudinal beams; 5-inhaul cable.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

As shown in fig. 1 to 5, the embodiment of the present utility model provides an open truss structure including two single trusses 1, a cross member 2 and brackets 3. The two single trusses 1 are arranged in parallel. The single truss 1 includes a lower chord 11, an upper chord 12, a vertical web member 13, and a diagonal web member 14. In practical application, the lower chord member 11 is a rectangular pipe, and concrete can be filled in according to requirements. Specifically, the upper chord 12 is also a rectangular tube.

With continued reference to fig. 2, the upper chord 12 and the lower chord 11 are disposed in parallel. A plurality of vertical web members 13 are fixed between the upper chord member 12 and the lower chord member 11, and the plurality of vertical web members 13 are arranged at equal intervals along the length direction of the upper chord member 12. A diagonal web member 14 is fixed between each two adjacent vertical web members 13. In practical application, the vertical web member 13 is also rectangular, the diagonal web member 14 is made of I-steel or rectangular, and the transverse bridge dimension of the diagonal web member 14 is consistent with the width of the lower chord member 11.

With continued reference to fig. 4, a number of cross beams 2 are provided between two single trusses 1. The arrangement positions of each cross beam 2 are respectively in one-to-one correspondence with the vertical web members 13, and the two ends of each cross beam 2 are respectively connected with the vertical web members 13 at the corresponding positions. In practical application, the cross beam 2 is connected with the vertical web member 13, so that the out-of-plane calculated length of the vertical web member 13 is reduced, the out-of-plane rigidity of the vertical web member 13 is increased, the lateral constraint on the upper chord member 12 can be remarkably improved, and the critical load for lateral instability of the upper chord member 12 is increased. Specifically, the cross member 2 is a rectangular tube.

With continued reference to fig. 3, two brackets 3 are respectively disposed below each beam 2, and the two brackets 3 are respectively disposed at two ends of the beam 2. The bracket 3 is triangular in shape, the end face of the first side of the triangle is fixed with the lower end of the cross beam 2, and the end face of the second side of the triangle is fixed with the vertical web member 13. In practical application, the bracket 3 supports the cross beam 2, and simultaneously enhances the rigidity of the connecting joint of the lower chord member 11 and the vertical web member 13 and the connecting joint of the vertical web member 13 and the cross beam 2, so that the risk of local damage of the joint is reduced.

The embodiment of the utility model provides an open truss structure, which comprises two single trusses 1, a cross beam 2 and brackets 3. The two single trusses 1 are arranged in parallel. The single truss 1 includes a lower chord 11, an upper chord 12, a vertical web member 13, and a diagonal web member 14. The upper chord 12 and the lower chord 11 are arranged in parallel. A plurality of vertical web members 13 are fixed between the upper chord member 12 and the lower chord member 11, and the plurality of vertical web members 13 are arranged at equal intervals along the length direction of the upper chord member 12. A diagonal web member 14 is fixed between each two adjacent vertical web members 13. A plurality of cross beams 2 are arranged between the two single trusses 1. The arrangement positions of each cross beam 2 are respectively in one-to-one correspondence with the vertical web members 13, and the two ends of each cross beam 2 are respectively connected with the vertical web members 13 at the corresponding positions. Two brackets 3 are respectively arranged below each beam 2, and the two brackets 3 are respectively positioned at two ends of the beam 2. The bracket 3 is triangular in shape, the end face of the first side of the triangle is fixed with the lower end of the cross beam 2, and the end face of the second side of the triangle is fixed with the vertical web member 13. The utility model has reasonable structural form, excellent mechanical property and more convenient construction, the open truss forms a middle-bearing open truss by upward movement of the cross beam 2, and meanwhile, the bracket 3 is arranged to strengthen the node and support the cross beam 2 so as to increase the out-of-plane bearing capacity of the structure, so that the stress of the open truss structure is more reasonable, the structural bearing capacity of the open truss is improved, the critical load of lateral instability of the upper chord 12 is increased, the risk of overall transverse instability of the open truss is reduced, and the breakthrough of the span of the open truss structure is realized.

In practice, the cross beam 2 is fixed in the middle of the vertical web member 13. Specifically, the cross beam 2 is fixed in the middle of the vertical web member 13, so that not only is the out-of-plane rigidity of the vertical web member 13 increased, but also the lateral restraining effect of the vertical web member 13 on the upper chord member 12 is remarkably improved, and the critical load of the upper chord member 12 for lateral instability is increased.

With continued reference to fig. 4, the open truss structure further includes a stringer 4. A plurality of small longitudinal beams 4 are arranged between every two adjacent cross beams 2, and the small longitudinal beams 4 are arranged at intervals along the length direction of the cross beams 2. In practical application, the small longitudinal beam 4 can transmit bridge deck load to make adjacent crossbeam 2 offset the load of vehicle together with the small longitudinal beam 4, thereby make the atress of crossbeam 2 more even, avoid single crossbeam 2 atress too big, and then avoid this open truss structure to take place local decline. Specifically, the small stringers 4 are i-beams.

In practice, the top of the side sill 4 coincides with the top of the cross member 2. In particular, the overlapping of the top of the side sill 4 and the top of the cross member 2 enables a more smooth transfer of the forces between the side sill 4 and the cross member 2, thus enhancing overall stability.

With continued reference to fig. 5, the cross-sectional width of the upper chord 12, the cross-sectional width of the vertical web member 13, and the cross-sectional width of the lower chord 11 are all equal. In practical application, the cross section widths of the upper chord member 12, the vertical web member 13 and the lower chord member 11 are equal, so that the acting force on the upper chord member 12 can be smoothly transferred to the vertical web member 13, and then smoothly transferred to the lower chord member 11 through the vertical web member 13, thereby enhancing the overall stability and reducing the possibility of out-of-plane instability.

As shown in fig. 1, the open truss structure further includes guys 5. A plurality of inhaul cables 5 are arranged between the two single trusses 1, and the plurality of inhaul cables 5 are arranged at intervals along the length direction of the single trusses 1. Both ends of each stay 5 are fixed to the lower chord 11. In practical application, the two lower chords 11 are connected and pretensioned through the stay ropes 5, so that the open truss has initial expansion displacement to offset the inward tilting displacement of the open truss caused by partial external load, and the risk of integral transverse instability of the open truss structure is reduced. In addition, when the beam 2 is fixed in the middle of the vertical web member 13, a larger clearance is provided between the beam 2 and the inhaul cable 5, and other pipeline facilities or maintenance pipelines with overline requirements can be arranged above the inhaul cable 5.

With continued reference to fig. 1, a pull rope 5 is respectively disposed on two sides of each bracket 3, and two ends of the pull rope 5 are fixed with the lower chord 11. In practical application, the stay ropes 5 are arranged on two sides of the bracket 3, so that the pulling force of the stay ropes 5 can be better transmitted to the vertical web members 13 and the upper chords 12, and the risk of integral transverse instability of the open truss structure is reduced.

In practical application, the open truss of the utility model is specifically manufactured as follows:

firstly, processing and manufacturing each rod piece forming a truss in a factory according to design requirements, then, carrying out perforating treatment on the side plates of the lower chord member 11 according to the design position of the stay rope 5, welding transverse partition plates and longitudinal stiffening ribs required by the joint positions on the inner wall of the lower chord member 11, then, forming a single truss 1 by the lower chord member 11, the vertical web members 13, the inclined web members 14 and the upper chord members 12 according to the installation sequence and the connection mode of truss manufacturing, forming two single trusses 1, connecting the two single trusses 1 into a whole by using the cross beam 2, simultaneously installing the small longitudinal beams 4 between the cross beams 2, then installing the bracket 3, setting temporary tensioning supports at the bottom of the cross beam 2 after the bracket 3 is installed, finally, installing the stay rope 5 in place and pre-tensioning the stay rope 5, canceling the temporary supports, and obtaining the completed open truss structure, and carrying out construction of other structures and facilities above the truss according to actual requirements after the whole truss is hoisted to the designated positions as a bearing structure.

In this specification, each embodiment is described in a progressive manner, and the same or similar parts of each embodiment are referred to each other, and each embodiment is mainly described as a difference from other embodiments.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the present utility model; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. An open truss structure is characterized by comprising two single trusses (1), a cross beam (2) and brackets (3);

two single trusses (1) are arranged in parallel;

the single truss (1) comprises a lower chord member (11), an upper chord member (12), a vertical web member (13) and a diagonal web member (14);

the upper chord (12) and the lower chord (11) are arranged in parallel;

a plurality of vertical web members (13) are fixed between the upper chord member (12) and the lower chord member (11), and the plurality of vertical web members (13) are arranged at equal intervals along the length direction of the upper chord member (12); one inclined web member (14) is fixed between every two adjacent vertical web members (13);

a plurality of cross beams (2) are arranged between the two single trusses (1); the arrangement positions of the cross beams (2) are respectively in one-to-one correspondence with the vertical web members (13), and the two ends of each cross beam (2) are respectively connected with the vertical web members (13) at the corresponding positions;

two brackets (3) are respectively arranged below each cross beam (2), and the two brackets (3) are respectively positioned at two ends of the cross beams (2); the bracket (3) is triangular, the end face of the first side of the triangle is fixed with the lower end of the cross beam (2), and the end face of the second side of the triangle is fixed with the vertical web member (13).

2. Open truss structure according to claim 1, characterized in that the cross beams (2) are fixed in the middle of the vertical web members (13).

3. The open truss structure according to claim 1, further comprising stringers (4);

a plurality of small longitudinal beams (4) are arranged between every two adjacent cross beams (2), and the small longitudinal beams (4) are arranged at intervals along the length direction of the cross beams (2).

4. An open truss structure according to claim 3, characterized in that the top of the side sill (4) and the top of the cross member (2) coincide.

5. An open truss structure according to claim 1, characterized in that the cross-sectional width of the upper chord (12), the cross-sectional width of the vertical web member (13) and the cross-sectional width of the lower chord (11) are all equal.

6. The open truss structure according to claim 1, further comprising guys (5);

a plurality of inhaul cables (5) are arranged between the two single trusses (1), and the inhaul cables (5) are arranged at intervals along the length direction of the single trusses (1);

both ends of each inhaul cable (5) are fixed with the lower chord member (11).

7. An open truss structure according to claim 6, characterized in that one of said guy wires (5) is provided on each side of each of said brackets (3), both ends of said guy wires (5) being fixed to said lower chord (11).