CN109898402B - Steel truss mixed beam cable-stayed bridge with mixed joint structure - Google Patents
Steel truss mixed beam cable-stayed bridge with mixed joint structure Download PDFInfo
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- CN109898402B CN109898402B CN201910211407.1A CN201910211407A CN109898402B CN 109898402 B CN109898402 B CN 109898402B CN 201910211407 A CN201910211407 A CN 201910211407A CN 109898402 B CN109898402 B CN 109898402B
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Abstract
The invention discloses a steel truss mixed beam cable-stayed bridge with a mixed joint structure, which relates to the field of mixed beam connection and comprises a steel truss beam, a concrete beam and a mixed joint, wherein the concrete beam comprises an upper layer concrete beam and a lower layer concrete beam; the hybrid joint is connected with the upper concrete beam and the steel truss beam, so that force transmission can be performed between the upper concrete beam and the lower steel truss beam, the force transmission between the steel truss beam and the concrete beam is simplified, and smooth force transmission between the steel truss beam and the concrete beam is fully guaranteed.
Description
Technical Field
The invention relates to the field of hybrid beam connection, in particular to a steel truss hybrid beam cable-stayed bridge with a hybrid joint structure.
Background
The existing large-span bridge structure is characterized in that the dead weight of the structure is reduced, a main span generally adopts a steel structure, and an edge span can flexibly adopt a steel beam or a concrete beam according to the terrain, wherein the economical efficiency is better when the edge span adopts the concrete beam on the shore or in a shoal area.
For a highway-railway dual-purpose bridge passing through highways and railways simultaneously, a truss structure is usually adopted as a main beam to reduce the width of the bridge deck and improve the system rigidity of the structure. Although there are many examples of the hybrid girder bridge in which the steel box girder and the concrete box girder are combined, the hybrid girder bridge in which the steel girder and the concrete girder are combined is not common because the combination structure of the concrete girder and the steel girder is complicated and is not easy to design.
Wherein, the mixed structural style of steel longeron among the prior art and concrete beam still has following limitation on application scope:
1) the applicability of the truss cable-stayed bridge for the combined construction of double layers of roads and railways is limited. The height of the steel truss girder passing through the single deck is generally not more than 8m, so that the method adopting the existing side span concrete girder is acceptable in economical efficiency. And the steel truss girder of double-deck bridge floor is because receiving the restriction of the current clear height of lower floor's bridge floor, must accomplish more than 15m usually, if still adopt current limit span concrete beam's structure, can be because limit span concrete beam is too high, for satisfying the construction requirement and the lower floor driving needs of concrete web height-thickness ratio, the web and the bottom plate of concrete box girder all need design very thickly, and the quantity of concrete beam sharply increases. And the increase of the use amount of the concrete beam is equivalent to the corresponding increase of the counterforce of the pier which causes the supporting effect, and in order to meet the stress requirement, the use amount of the concrete of the pier also needs to be increased, so the structure has poor economical efficiency for the double-layer passing bridge.
2) The adaptability to the side-span terrain is not strong enough. The existing concrete beam is an integral box beam in the whole length, is limited by the high beam height of the integral box beam when the mid-span truss height is high, the bridge deck elevation is limited and the fluctuation change of the side-span terrain is large, is easy to cause large-volume earthwork excavation meaninglessly, and has unsatisfactory adaptability to the terrain.
3) The transmission of forces between the steel truss and the concrete beam is complicated. Due to the layered structure of the concrete beam, when the steel truss beam and the concrete beam are connected together through the shear connecting piece, force transmission between the steel truss beam and the concrete beam is complex, and the phenomenon that the joint of the steel truss beam and the concrete beam cracks easily occurs.
Disclosure of Invention
In view of the drawbacks of the prior art, an object of the present invention is to provide a steel truss hybrid girder cable-stayed bridge having a hybrid joint structure, which can reduce the amount of concrete used for the bridge and simplify the transmission of force between the steel truss girder and the concrete girder.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a steel truss hybrid beam cable-stayed bridge having a hybrid joint configuration, comprising:
a steel truss beam;
the concrete beam comprises an upper layer concrete beam and a lower layer concrete beam;
the hybrid joint, the hybrid joint is the box structure, hybrid joint one end with the steel truss is connected, the other end with the upper concrete beam is connected, just the hybrid joint with lower floor's concrete beam does not connect.
On the basis of the technical scheme, the hybrid joint comprises a top plate, a bottom plate and two webs, one end of the top plate is connected with the steel truss girder, the other end of the top plate is connected with the upper-layer concrete girder, one end of the bottom plate is connected with the steel truss girder, the other end of the bottom plate is not connected with the lower-layer concrete girder, and the webs are connected with the top plate and the bottom plate.
On the basis of the technical scheme, the length of the top plate is 3-4 times of the height of the steel truss girder.
On the basis of the technical scheme, one side edge of the mixed joint, which is far away from the steel truss girder, is a chamfer.
On the basis of the technical scheme, the chamfer is arc-shaped.
On the basis of the technical scheme, the lower layer concrete beam is fixed with the upper layer concrete beam through the hanging rod.
On the basis of the technical scheme, the cable-stayed bridge further comprises a plurality of first piers, the upper concrete beam is arranged on the first piers, the first piers are provided with protruding portions, and the lower concrete beam is located on the protruding portions.
On the basis of the technical scheme, a first support is arranged on the protruding portion, and the lower-layer concrete beam is arranged on the first support.
On the basis of the technical scheme, the lower-layer concrete beam comprises a bridge deck and a pavement.
On the basis of the technical scheme, the hybrid joint is connected with the steel truss girder through a shear connector.
Compared with the prior art, the invention has the advantages that:
(1) according to the steel truss mixed beam cable-stayed bridge with the mixed joint structure, the concrete beams are arranged into the upper layer concrete beam and the lower layer concrete beam which are separated, and a web plate can be prevented from being used for connecting the upper layer concrete beam and the lower layer concrete beam, so that the defects of beam height, plate thickness and the like caused when the whole side span concrete beam is in an integral box girder structure are overcome, the consumption of concrete is reduced, meanwhile, the counter force transmitted to a pier is effectively reduced, and the scale of a side span foundation is reduced; the hybrid joint is connected with the upper concrete beam and the steel truss beam, so that force transmission can be performed between the upper concrete beam and the lower steel truss beam, the force transmission between the steel truss beam and the concrete beam is simplified, and smooth force transmission between the steel truss beam and the concrete beam is fully guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a hybrid beam cable-stayed bridge according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a hybrid joint in an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along the line A-A in the embodiment of the present invention;
fig. 4 is another structural view of the concrete beam according to the embodiment of the present invention.
In the figure: 1-steel truss girder, 2-concrete girder, 21-upper concrete girder, 22-lower concrete girder, 23-suspension rod, 3-mixed joint, 31-top plate, 32-bottom plate, 33-web plate, 41-first pier, 42-second pier, 43-protrusion, 51-first support and 52-second support.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a steel truss hybrid beam cable-stayed bridge with a hybrid joint structure, including a steel truss beam 1, a concrete beam 2 and a hybrid joint 3, where the concrete beam 2 includes an upper concrete beam 21 and a lower concrete beam 22 that are separately arranged, the hybrid joint 3 is of a box-type structure, one end of the hybrid joint 3 is connected to the steel truss beam 1, the other end is connected to the upper concrete beam 21, and the hybrid joint 3 is not connected to the lower concrete beam 22.
The concrete beam 2 is arranged into the upper-layer concrete beam 21 and the lower-layer concrete beam 22 which are separated, wherein the web plate of the concrete beam 2 can be prevented from being used for connecting the upper-layer concrete beam 21 and the lower-layer concrete beam 22, and the web plate of the concrete beam 2 can be omitted, so that the defects of beam height, plate thickness and the like caused when the whole side span concrete beam 2 adopts an integral box girder structure are overcome, the concrete consumption is reduced, meanwhile, the counter force transmitted to a pier is effectively reduced, and the scale of a side span foundation is reduced; the hybrid joint 3 is connected with the upper concrete beam 21 and the steel truss beam 1 through arrangement, force transmission can be carried out between the upper concrete beam 21 and the steel truss beam 1, force transmission between the steel truss beam 1 and the concrete beam 2 is simplified, stress concentration is reduced, and smooth force transmission between the steel truss beam 1 and the concrete beam 2 is fully guaranteed.
Referring to fig. 1, 3 and 4, further, the lower concrete beam 22 is fixed with the upper concrete beam 21 by a hanger rod 23, and another fixing mode of the lower concrete beam 22 is as follows: cable-stay bridge still includes a plurality of first piers 41, upper concrete beam 21 is located on first pier 41, and be equipped with protruding portion 43 on the first pier 41, lower floor's concrete beam 22 is located protruding portion 43, wherein, be equipped with first support 51 on the protruding portion 43, lower floor's concrete beam 22 is located on first support 51, can guarantee the relatively fixed of upper concrete beam 21 and lower floor's concrete beam 22 position of separation, avoid upper concrete beam 21 and lower floor's concrete beam 22 to adopt whole box girder structure, thereby avoided the roof beam height, shortcomings such as the thick board of web of whole box girder structure, and then reduced the quantity of concrete.
Referring to fig. 1 and 2, the hybrid joint 3 includes a top plate 31 and a bottom plate 32 which are arranged up and down, and two webs 33, preferably, the length of the top plate 31 is 3 to 4 times of the height of the steel truss girder 1, one end of the top plate 31 is connected with the steel truss girder 1, the other end is connected with the upper concrete girder 21, one end of the bottom plate 32 is connected with the steel truss girder 1, and the other end is not connected with the lower concrete girder 22; one side edge of the hybrid joint 3, which is far away from the steel truss girder 1, is a chamfer, wherein two side edges of a web 33 are respectively equal in length and connected with the top plate 31 and the bottom plate 32, the side edge of the web 33, which is close to the steel truss girder 1, is a straight line, the area of the web 33 is not more than the quadrilateral area formed by the side edges of the top plate 31 and the bottom plate 32, and the length of the top plate 31 is not less than the length of the bottom plate 32; preferably, the side of the web 33 remote from the steel girder 1 is curved.
Referring to fig. 1, the cable-stayed bridge further comprises a second bridge pier 42, a bottom plate 32 and a lower concrete beam 22 are arranged on the second bridge pier 42, a plurality of second supports 52 are arranged on the second bridge pier 42, and a mixed joint 3 or a lower concrete beam 22 is arranged on each second support 52, so that the part, close to the lower concrete beam 22, of the mixed joint 3 can be located on the second bridge pier 42, and bending deformation or damage of the part, close to the lower concrete beam 22, of the mixed joint 3 due to self weight or long-term load action is avoided.
The lower concrete beam 22 includes a deck and a pavement. When the height of the mid-span truss is high, the elevation of the lower layer concrete beam 22 is limited and the fluctuation change of the side-span terrain is large, the lower layer concrete beam 22 is constructed through the terrain higher than the elevation in the area, so that the lower layer concrete beam 22 forms a road surface parallel to the bridge floor of the lower layer concrete beam 22, and the road surface is connected with the bridge floor to form the integral lower layer concrete beam 22, so that the 2 beam height of the side-span concrete beam is not limited by the mid-span truss height any more, the upper layer structural beam type and the lower layer structural form can be flexibly selected according to actual needs, and the adaptability of the main beam structure to the fluctuant terrain is improved.
Wherein, hybrid joint 3 passes through shear force connecting piece with steel longeron 1 and is connected, can connect hybrid joint 3 and steel longeron 1 and form wholly, guarantees the smooth-going transmission of power between steel longeron 1 and hybrid joint 3.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A steel truss hybrid beam cable-stayed bridge with a hybrid joint configuration, comprising:
a steel truss beam (1);
the concrete beam (2), the concrete beam (2) comprises an upper layer concrete beam (21) and a lower layer concrete beam (22);
the hybrid joint (3), the hybrid joint (3) is the box structure, hybrid joint (3) one end with steel truss (1) is connected, the other end with upper concrete beam (21) is connected, just hybrid joint (3) with lower floor's concrete beam (22) do not connect.
2. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 1, wherein: mix joint (3) including roof (31), bottom plate (32) and two webs (33), roof (31) one end with steel longeron (1) is connected, the other end with upper concrete beam (21) is connected, bottom plate (32) one end with steel longeron (1) is connected, the other end with lower floor concrete beam (22) do not throw out of connection, web (33) are connected roof (31) and bottom plate (32).
3. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 2, wherein: the length of the top plate (31) is 3-4 times of the height of the steel truss girder (1).
4. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 1, wherein: one side edge of the mixed joint (3) far away from the steel truss beam (1) is a chamfer.
5. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 4, wherein: the chamfer is arc-shaped.
6. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 1, wherein: the lower layer concrete beam (22) is fixed with the upper layer concrete beam (21) through a hanging rod (23).
7. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 1, wherein: the cable-stayed bridge further comprises a plurality of first piers (41), the upper-layer concrete beam (21) is arranged on the first piers (41), the first piers (41) are provided with protruding portions (43), and the lower-layer concrete beam (22) is located on the protruding portions (43).
8. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 7, wherein: the protruding portion (43) is provided with a first support (51), and the lower-layer concrete beam (22) is arranged on the first support (51).
9. A steel truss hybrid beam cable-stayed bridge having a hybrid joint construction as claimed in claim 1, wherein: the hybrid joint (3) is connected with the steel truss girder (1) through a shear connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211407.1A CN109898402B (en) | 2019-03-20 | 2019-03-20 | Steel truss mixed beam cable-stayed bridge with mixed joint structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910211407.1A CN109898402B (en) | 2019-03-20 | 2019-03-20 | Steel truss mixed beam cable-stayed bridge with mixed joint structure |
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| CN109898402A CN109898402A (en) | 2019-06-18 |
| CN109898402B true CN109898402B (en) | 2020-09-01 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201317908Y (en) * | 2007-12-27 | 2009-09-30 | 上海市政工程设计研究总院 | Double deck cable stayed bridge of separation type |
| JP5255543B2 (en) * | 2009-09-17 | 2013-08-07 | 鹿島建設株式会社 | Mixed girder joint structure |
| CN203320399U (en) * | 2013-05-10 | 2013-12-04 | 中铁二院工程集团有限责任公司 | Six-line double-layer railway bridge pier |
| CN104499415A (en) * | 2014-08-15 | 2015-04-08 | 上海市政工程设计研究总院（集团）有限公司 | Main girder structure system of double-layer bridge deck cable-stayed bridge |
| CN104294748B (en) * | 2014-09-23 | 2016-08-24 | 同济大学 | A kind of hybrid beam cable-stayed bridge adapter section structure and construction method thereof |
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