Steel box girder and steel truss combined large-span prestressed structure

Abstract

The utility model provides a steel box girder and steel truss combined large-span prestress structure which comprises a steel truss unit and a steel box girder unit. Each steel truss unit comprises an upper chord member and a lower chord member which are arranged in parallel, and a plurality of straight web members and diagonal web members are arranged between the upper chord member and the lower chord member; the two steel box girder units are located at the two ends of the steel truss unit correspondingly. Each steel box girder unit comprises an upper flange plate, a lower flange plate and two webs. Wherein the lower chord member extends into the steel box girder unit and is in lap joint with the lower flange plate, and the lap joint length of the lower chord member on the lower flange plate is not smaller than the height of the lower chord member; the upper flange plate is located between the upper chord member and the lower chord member, and the upper flange plate is welded with the straight web members and the diagonal web members; the two webs are located on the two sides of the steel truss unit. The steel box girder and steel truss combined large-span prestressed structure can well meet the building requirements, span a large space at the same time, and generate a perfect building effect.

Description

Technical Field

[0001] The utility model relates to the technical field of long-span steel structures, and particularly relates to a long-span prestressed structure combining a steel box girder and a steel truss. Background Art

[0002] In the existing structural design, when the span is not large, a steel box girder, a reinforced concrete beam or a prestressed concrete beam can be adopted. When the structural span is relatively large, such as more than 18 m, a concrete or steel truss structure is generally adopted. However, in some cases, due to the requirements of the building functions at both ends, the structural height is restricted, making it impossible to adopt a full-span steel truss. At the same time, due to the need to span a large space, it is difficult to adopt a full-span steel box girder design. Therefore, it is necessary to design a long-span steel structure that takes into account the height restrictions at both ends and the requirements of the stiffness, force and stability of the long-span structure. Content of the Utility Model

[0003] In view of this, the utility model provides a long-span prestressed structure combining a steel box girder and a steel truss, aiming to solve the above problems to at least a certain extent.

[0004] The technical solution of the utility model is realized as follows:

[0005] A long-span prestressed structure combining a steel box girder and a steel truss includes:

[0006] Steel truss units and steel box girder units;

[0007] The steel truss unit includes upper chord bars and lower chord bars arranged in parallel, and a plurality of vertical web members and diagonal web members are arranged between the upper chord bars and the lower chord bars;

[0008] There are two steel box girder units, which are respectively located at both ends of the steel truss unit. The steel box girder unit includes an upper flange plate, a lower flange plate and two web plates;

[0009] Wherein, the lower chord bar extends into the steel box girder unit and overlaps on the lower flange plate, and the overlapping length of the lower chord bar on the lower flange plate is not less than the height of the lower chord bar; the upper flange plate is located between the upper chord bar and the lower chord bar, and the upper flange plate is welded to the vertical web members and the diagonal web members; the two web plates are located on both sides of the steel truss unit.

[0010] As a further optional scheme, the cross sections of the upper chord bar, the lower chord bar, the vertical web member and the diagonal web member are all box-shaped.

[0011] As a further optional scheme, a steel plate shear wall is arranged between the vertical web members and the diagonal web members within the length range of the upper flange plate.

[0012] As a further optional scheme, prestressing tendons are arranged in the lower chord bar in a tensioned manner.

[0013] As a further optional solution, a manhole is provided on the steel box beam unit.

[0014] As a further optional scheme, it also includes a first support and a second support, which are respectively arranged on the outside of the ends of the two steel box beam units, and the first support is provided with a first connecting member, which is connected to the web of one steel box beam unit through a horizontally arranged bolt; the second support is provided with a second connecting member, which is connected to the web of the other steel box beam unit through a horizontally arranged bolt.

[0015] As a further optional solution, the first support is a concrete structure, the first connecting member is arranged on the side of the first support, the first connecting member includes two parallel first connecting plates, an installation groove for inserting the web is formed between the two first connecting plates, and the two first connecting plates are connected to the web by a number of bolts.

[0016] As a further optional solution, the first connecting member also includes a first tensioning plate arranged on the side of the first support, the first connecting plate is arranged on the side of the first tensioning plate away from the first support, a plurality of first stiffening plates are arranged between the first tensioning plate and the first connecting plate, and a first shear key is arranged on the side of the first tensioning plate close to the first support, and the first shear key is pre-embedded in the first support.

[0017] As a further optional solution, the second support is a concrete structure, the second connecting member is arranged on the side of the second support, the second connecting member includes two parallel second connecting plates, an installation groove for the web to be inserted is formed between the two second connecting plates, the two second connecting plates are provided with horizontally arranged strip sliding holes, the webs are provided with horizontally arranged bolts, and the two ends of the bolts are slidably arranged in the strip sliding holes on the two second connecting plates; a polytetrafluoroethylene slide plate is provided between the second connecting plate and the web.

[0018] As a further optional solution, the second connecting member also includes a second tensioning plate arranged on the side of the second support, the second connecting plate is arranged on the side of the second tensioning plate away from the second support, a plurality of second stiffening plates are arranged between the second tensioning plate and the second connecting plate, and a second shear key is arranged on the side of the second tensioning plate close to the second support, and the second shear key is pre-embedded in the second support.

[0019] Compared with the prior art, the large-span prestressed structure of the steel box girder and steel truss combination of the present application has at least the following beneficial effects:

[0020] This large-span prestressed structure composed of a steel box girder and a steel truss stably combines the steel truss unit and the steel box girder unit. The steel box girder units at both ends can meet the situation where the structural heights at both ends are restricted, while the steel truss unit can meet the requirements of the structural stiffness, force-bearing capacity, and stability of the large span, enabling this large-span prestressed structure composed of a steel box girder and a steel truss to well meet the building requirements and span large spaces, and producing a perfect building effect. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic side view of a large-span prestressed structure composed of a steel box girder and a steel truss according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic connection structure diagram of the steel truss unit and the steel box girder unit;

[0024] Figure 3 It is a schematic top view of the steel box girder unit connected to the first support;

[0025] Figure 4 It is a schematic side view of the steel box girder unit connected to the first support;

[0026] Figure 5 It is a schematic top view of the steel box girder unit connected to the second support;

[0027] Figure 6 It is a schematic side view of the steel box girder unit connected to the second support.

[0028] In the figures: 1. Steel truss unit; 11. Upper chord; 12. Lower chord; 13. Vertical web member; 14. Diagonal web member;

[0029] 2. Steel box girder unit; 21. Upper flange plate; 22. Lower flange plate; 23. Web; 24. Manhole;

[0030] 3. Steel plate shear wall;

[0031] 4. Prestressing tendon;

[0032] 5. First support; 51. First connecting member; 511. First connecting plate; 512. First tension plate; 513. First stiffening plate; 514. First shear key;

[0033] 6. Second support; 61. Second connecting member; 611. Second connecting plate; 6111. Strip-shaped sliding hole; 612. Second tension plate; 613. Second stiffening plate; 614. Second shear key;

[0034] 7. Bolt;

[0035] 8. Polytetrafluoroethylene slide plate. Detailed implementation manners

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0038] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Refer to Figure 1 and Figure 2 , an embodiment of the present invention shows a long-span prestressed structure composed of a steel box girder and a steel truss, including a steel truss unit 1 and a steel box girder unit 2;

[0040] The steel truss unit 1 includes an upper chord 11 and a lower chord 12 arranged in parallel. A plurality of straight web members 13 and diagonal web members 14 are provided between the upper chord 11 and the lower chord 12. Two steel box girder units 2 are provided and are respectively located at both ends of the steel truss unit 1. The steel box girder unit 2 includes an upper flange 21, a lower flange 22 and two webs 23. The lower chord 12 extends into the steel box girder unit 2 and overlaps on the lower flange 22. The overlapping length of the lower chord 12 on the lower flange 22 is not less than the height of the lower chord 12. The upper flange 21 is located between the upper chord 11 and the lower chord 12, and the upper flange 21 is welded to the straight web members 13 and the diagonal web members 14. The two webs 23 are located on both sides of the steel truss unit 1.

[0041] Among them, as Figure 2 shown, the upper flange 21 is arranged between the upper chord 11 and the lower chord 12. It can be considered that the upper flange 21 divides part of the straight web members 13 and part of the diagonal web members 14 into upper and lower sections. The top of the lower section of the straight web member 13 is welded to the bottom of the upper flange 21, and the bottom of the upper section of the straight web member 13 is welded to the top of the upper flange 21. The same applies to the diagonal web member 14. The lower chord 12 overlaps on the lower flange 22, which means that the lower chord 12 is welded to the lower flange 22. In application, based on the need to keep the lower surfaces of the steel truss unit 1 and the steel box girder unit 2 flush, the lower part of the lower chord 12 can be cut and then overlapped on the lower flange 22. The above structure enables the steel truss unit 1 and the steel box girder unit 2 to be cross-linked and fixed to each other, with high structural stability.

[0042] In this way, the steel box girder and steel truss combined long-span prestressed structure stably combines the steel truss unit 1 and the steel box girder unit 2. The steel box girder units 2 at both ends can meet the situation where the structural heights at both ends are restricted, while the steel truss unit 1 can meet the requirements of the structural stiffness, force and stability of the long span, enabling the steel box girder and steel truss combined long-span prestressed structure to well meet the building requirements and span a large space at the same time, and produce a perfect building effect.

[0043] Specifically in the above solution, the cross-sections of the upper chord 11, the lower chord 12, the straight web members 13 and the diagonal web members 14 are all box-shaped. Among them, as Figure 2 shown, prestressing tendons 4 can be tensioned inside the lower chord 12 to reduce the stress level of the lower chord 12 and reduce the deflection of the steel box girder and steel truss combined long-span prestressed structure. Preferably, for the convenience of construction, a manhole 24 is opened on the steel box girder unit 2.

[0044] In some embodiments, as Figure 2As shown, a steel plate shear wall 3 is provided between the vertical web member 13 and the diagonal web member 14 within the length range of the upper flange plate 21. The provision of the steel plate shear wall 3 is conducive to avoiding stress concentration at the connection position between the steel truss unit 1 and the steel box girder unit 2, and is also conducive to controlling the deflection of the truss. Among them, the thickness of the steel plate shear wall 3 is preferably the same as that of the vertical web member 13 and the diagonal web member 14.

[0045] In some embodiments, when the steel box girder and steel truss composite long-span prestressed structure is applied to the situation where the support conditions at both ends are poor (for example, the support does not have sufficient torsional resistance), as Figures 3 - 6 shown, a first support 5 and a second support 6 are respectively provided on the outer sides of the ends of the two steel box girder units 2. A first connecting member 51 is provided on the first support 5, and the first connecting member 51 is connected to the web 23 of a steel box girder unit 2 by a horizontally arranged bolt 7; a second connecting member 61 is provided on the second support 6, and the second connecting member 61 is connected to the web 23 of the other steel box girder unit 2 by a horizontally arranged bolt 7; there is a certain gap between the first support 5 and the end of the steel box girder unit 2, and between the second support 6 and the end of the steel box girder unit 2. In this way, the steel box girder unit 2 is more transmitted to the first support 5 and the second support 6 in the form of shear force, and the bending moment transmitted by the steel box girder unit 2 to the first support 5 and the second support 6 can be reduced. The first support 5 and the second support 6 are, for example, concrete beams with a length direction perpendicular to the steel box girder unit 2, and the bending moment transmitted by the steel box girder unit 2 is equivalent to the torque borne by the first support 5 / second support 6.

[0046] Specifically, the above solution is as Figure 3 and Figure 4As shown, the first connecting member 51 is arranged on the side surface of the first support 5. The first connecting member 51 includes two first connecting plates 511 arranged in parallel. An installation groove (not marked in the figure) for inserting the web 23 is formed between the two first connecting plates 511. The two first connecting plates 511 and the web 23 are connected by a plurality of bolts 7. The first connecting member 51 further includes a first tension plate 512 arranged on the side surface of the first support 5. The first tension plate 512 can be embedded in the side surface of the first support 5 and be tensioned and fixed. The first connecting plate 511 is arranged on the side surface of the first tension plate 512 away from the first support 5. A plurality of first stiffening plates 513 are arranged between the first tension plate 512 and the first connecting plate 511. The structural strength of the first connecting plate 511 is enhanced through the first stiffening plates 513, and the load-bearing capacity of the first connecting plate 511 for the web 23 is improved. A first shear key 514 is arranged on the side surface of the first tension plate 512 close to the first support 5. The first shear key 514 is embedded in the first support 5. The first shear key 514 can be an H-shaped steel, and the shear resistance between the first connecting member 51 and the first support 5 is enhanced through the first shear key 514.

[0047] Specifically, in the above solution, as Figure 5 and Figure 6 shown, the second connecting member 61 is arranged on the side surface of the second support 6. The second connecting member 61 includes two second connecting plates 611 arranged in parallel. An installation groove (not marked in the figure) for inserting the web 23 is formed between the two second connecting plates 611. Horizontal strip-shaped sliding holes 6111 are provided on the two second connecting plates 611. A horizontally arranged bolt 7 is arranged on the web 23. Both ends of the bolt 7 are slidably arranged in the strip-shaped sliding holes 6111 on the two second connecting plates 611. A polytetrafluoroethylene sliding plate 8 is arranged between the second connecting plate 611 and the web 23. Among them, the web 23 can slide on the second connecting member 61 through the bolt 7, which better adapts to the structural load and temperature expansion and contraction deformation requirements in the long-span prestressed structure composed of the steel box girder and the steel truss. The polytetrafluoroethylene sliding plate 8 can reduce the friction force between the web 23 and the second connecting plate 611, and the polytetrafluoroethylene sliding plate 8 can be fixed on the web 23 or the second connecting plate 611.

[0048] Preferably, the bolts 7 for the first support 5 are friction-type high-strength bolts; the bolts 7 for the second support 6 are bearing-type high-strength bolts to ensure that the connection nodes have sufficient strength.

[0049] In addition, the second connecting member 61 further includes second tie plates 612 disposed on the side surface of the second support 6. The second tie plates 612 can be embedded in the side surface of the second support 6 and fixed by tension. The second connecting plate 611 is disposed on the side surface of the second tie plates 612 away from the second support 6. A plurality of second stiffening plates 613 are disposed between the second tie plates 612 and the second connecting plate 611 to strengthen the structural strength of the second connecting plate 611 through the second stiffening plates 613 and improve the bearing capacity of the second connecting plate 611 for the web 23. A second shear key 614 is disposed on the side surface of the second tie plates 612 close to the second support 6. The second shear key 614 is embedded in the second support 6. The second shear key 614 can be an H-shaped steel to strengthen the shear resistance between the second connecting member 61 and the second support 6 through the second shear key 614.

[0050] It should be noted that when the span and the force are not large, the first shear key and the second shear key can also be studs.

[0051] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large-span prestressed structure composed of a steel box girder and a steel truss, characterized in that, Comprising: Steel truss units and steel box girder units; The steel truss unit includes upper chord bars and lower chord bars arranged in parallel, and a plurality of straight web members and diagonal web members are provided between the upper chord bars and the lower chord bars; There are two steel box girder units which are respectively located at both ends of the steel truss unit. The steel box girder unit includes an upper flange plate, a lower flange plate and two web plates; Wherein, the lower chord bar extends into the steel box girder unit and is lapped on the lower flange plate, and the lapping length of the lower chord bar on the lower flange plate is not less than the height of the lower chord bar; the upper flange plate is located between the upper chord bar and the lower chord bar, and the upper flange plate is welded to the straight web members and the diagonal web members; the two web plates are located on both sides of the steel truss unit.

2. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 1, characterized in that The cross-sections of the upper chord bar, the lower chord bar, the straight web member and the diagonal web member are all box-shaped.

3. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 2, characterized in that, A steel plate shear wall is arranged between the straight web members and the diagonal web members within the length range of the upper flange plate.

4. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 1, characterized in that, Prestressing tendons are tensioned inside the lower chord bar.

5. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 4, characterized in that, Manholes are opened on the steel box girder unit.

6. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 1, characterized in that, It further includes a first support and a second support. The first support and the second support are respectively arranged on the outer sides of the ends of the two steel box girder units. A first connecting member is provided on the first support, and the first connecting member is connected to the web plate of one steel box girder unit through horizontally arranged bolts; a second connecting member is provided on the second support, and the second connecting member is connected to the web plate of the other steel box girder unit through horizontally arranged bolts.

7. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 6, characterized in that, The first support is of a concrete structure. The first connecting member is arranged on the side surface of the first support. The first connecting member includes two first connecting plates arranged in parallel. An installation groove for inserting the web plate is formed between the two first connecting plates, and the two first connecting plates and the web plate are connected through a plurality of bolts.

8. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 7, characterized in that The first connecting member further includes a first tension plate arranged on the side surface of the first support. The first connecting plate is arranged on the side surface of the first tension plate away from the first support. A plurality of first stiffening plates are arranged between the first tension plate and the first connecting plate. A first shear key is arranged on the side surface of the first tension plate close to the first support, and the first shear key is pre-embedded in the first support.

9. The long-span prestressed structure composed of a steel box girder and a steel truss according to any one of claims 6-8, characterized in that The second support is of a concrete structure. The second connecting member is arranged on the side surface of the second support. The second connecting member includes two second connecting plates arranged in parallel. An installation groove for inserting the web plate is formed between the two second connecting plates. Horizontally arranged strip-shaped sliding holes are provided on the two second connecting plates. Horizontally arranged bolts are provided on the web plate, and both ends of the bolts are slidably arranged in the strip-shaped sliding holes on the two second connecting plates; a polytetrafluoroethylene sliding plate is arranged between the second connecting plate and the web plate.

10. The long-span prestressed structure composed of a steel box girder and a steel truss according to claim 9, characterized in that, The second connecting member further includes a second tension plate arranged on the side surface of the second support. The second connecting plate is arranged on the side surface of the second tension plate away from the second support. A plurality of second stiffening plates are arranged between the second tension plate and the second connecting plate. A second shear key is arranged on the side surface of the second tension plate close to the second support, and the second shear key is pre-embedded in the second support.

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