CN113863114A - Cable-stayed bridge with roads and railways in asymmetrical arrangement on same floor - Google Patents
Cable-stayed bridge with roads and railways in asymmetrical arrangement on same floor Download PDFInfo
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- CN113863114A CN113863114A CN202111205191.1A CN202111205191A CN113863114A CN 113863114 A CN113863114 A CN 113863114A CN 202111205191 A CN202111205191 A CN 202111205191A CN 113863114 A CN113863114 A CN 113863114A
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- steel box
- box girder
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention relates to a cable-stayed bridge with roads and railways in asymmetrical arrangement at the same layer, which comprises: the system comprises a single or a plurality of bridge towers, a main beam, a transverse stabilizing cable and a plurality of stay cables for connecting the bridge towers and the main beam, wherein the bridge towers, the main beam, the transverse stabilizing cable and the stay cables are arranged along the longitudinal bridge direction; the main beam comprises a first steel box girder for arranging a railway and a second steel box girder for arranging a highway, the constant load on the first steel box girder is greater than the constant load on the second steel box girder, the first steel box girder and the second steel box girder are respectively positioned on two opposite sides of the bridge tower, the length of the first steel box girder along the transverse bridge direction is smaller than that of the second steel box girder along the transverse bridge direction, the distance between the first steel box girder and the bridge tower is a first preset distance, the distance between the second steel box girder and the bridge tower is a second preset distance, and the constant load action line of the main beam is superposed with the axis of the bridge tower in the transverse bridge direction by adjusting the first preset distance and the second preset distance; therefore, the unbalance loading effect caused by the asymmetrical arrangement of the transverse constant loads is eliminated, the structure is simple, the stress is clear, and the economy is good.
Description
Technical Field
The invention relates to the field of bridge structures, in particular to a cable-stayed bridge with roads and railways arranged asymmetrically on the same layer.
Background
At present, due to the fact that train loads are large, requirements on operation safety and stability are high, and vertical rigidity and beam end corner control are strict, a cable-stayed bridge with relatively high rigidity is often adopted for a large-span highway-railway dual-purpose bridge, a common mode of arranging the cable-stayed bridge on a highway-railway combined level is that a railway is arranged in the middle of a box girder, and roads are symmetrically arranged on two sides of the railway, and the mode is favorable for structural stress and reduces the manufacturing cost of a main bridge. However, the crossing of the highway wiring and the railway is inevitable, the space utilization rate is reduced, the construction cost of the approach bridge is increased, the comprehensive investment of the line is possibly increased, and if the railway is arranged on one side and the highway is arranged on the other side, the crossing problem of the highway wiring and the railway wiring is effectively avoided.
The cable-stayed bridge scheme in the related technology comprises a main beam, a plurality of middle-through main beam A-shaped bridge towers arranged along the main beam in the bridge direction, and a plurality of stay cables for connecting the bridge towers and the main beam on two sides of the transverse bridge, wherein the stay cables on two sides of the highway and the railway adopt different specifications and initial tension for balancing the unbalance loading effect under constant load and the unbalance loading effect under live load. However, under the action of the horizontal component force of the asymmetric cable force in the transverse bridge direction, the main beam and the main tower of the cable-stayed bridge generate transverse bridge deformation, and the transverse deformation of the concrete main tower is more obvious under the actions of shrinkage creep and second-order effect, so that the structure is more complicated, and the economical efficiency is reduced.
Disclosure of Invention
The embodiment of the invention provides a cable-stayed bridge with roads and railways in the same layer in asymmetric arrangement, which aims to solve the problems that a main beam and a main tower of the cable-stayed bridge in the related art generate transverse bridge deformation, the structure is complex and the economical efficiency is reduced.
In a first aspect, a cable-stayed bridge with roads and railways asymmetrically arranged on the same layer is provided, which includes: a single or a plurality of pylons arranged in the longitudinal bridge direction; the main beam comprises a first steel box girder for arranging a railway and a second steel box girder for arranging a highway, the constant load on the first steel box girder is greater than the constant load on the second steel box girder, the first steel box girder and the second steel box girder are respectively positioned on two opposite sides of the bridge tower, the length of the first steel box girder along the transverse bridge direction is smaller than the length of the second steel box girder along the transverse bridge direction, the distance between the first steel box girder and the bridge tower is a first preset distance, the distance between the second steel box girder and the bridge tower is a second preset distance, and the constant load action line of the main beam is coincided with the axis of the bridge tower in the transverse bridge direction by adjusting the first preset distance and the second preset distance; and a plurality of stay cables connecting the bridge tower and the two sides of the main beam in the transverse bridge direction.
In some embodiments, the bridge tower comprises: a lower pylon for supporting the cable-stayed bridge; the lower cross beam is fixed at the top of the lower tower column, the first steel box girder and the second steel box girder are arranged on the lower cross beam at intervals along the transverse bridge direction, and the width of the lower cross beam on one side of the first steel box girder is smaller than that on one side of the second steel box girder; and the upper tower column penetrates through a gap between the first steel box girder and the second steel box girder and is fixed with the lower cross beam.
In some embodiments, the bridge tower further comprises: the two cross braces are respectively arranged at two opposite ends of the lower cross beam and are fixed with the lower cross beam; and the transverse stabilizing cables comprise upper transverse stabilizing cables and lower transverse stabilizing cables, one ends of the upper transverse stabilizing cables are anchored at the upper part of the upper tower column, the other ends of the upper transverse stabilizing cables are connected with the anchoring points of the cross braces, one ends of the lower transverse stabilizing cables are connected with the anchoring points of the cross braces, and the other ends of the lower transverse stabilizing cables are anchored at the lower tower column.
In some embodiments, the anchoring point on one side of the first steel box girder has a first distance from the bridge tower, the anchoring point on one side of the second steel box girder has a second distance from the bridge tower, and the first distance is smaller than the second distance.
In some embodiments, the lower tower comprises: the lower section of the lower tower column is fixedly provided with a tower seat at the bottom; one end of the upper section of the lower tower column is fixed on the top surface of the lower section of the lower tower column, the other end of the upper section of the lower tower column is fixed with the lower cross beam, and the cross section area of the upper section of the lower tower column is smaller than that of the lower section of the lower tower column.
In some embodiments, a transverse wind-resistant support is arranged between each of the first steel box girder and the second steel box girder and the bridge tower.
In some embodiments, the first steel box girder is provided with a plurality of small longitudinal girders along a longitudinal direction of the railway track.
In some embodiments, the main beam further comprises: the crossbeam, it connects first steel box girder with the second steel box girder, the crossbeam is located first steel box girder with between the second steel box girder, and be equipped with a plurality ofly along indulging the bridge to the interval the crossbeam.
In some embodiments, the first and second steel box girders are substantially identical in structure, each comprising: the top plate, the flat bottom plate and the inclined bottom plate are arranged along the longitudinal bridge direction, the flat bottom plate and the inclined bottom plate are positioned on the same side of the top plate, a middle web plate is arranged between the top plate and the flat bottom plate, an edge web plate is arranged between the top plate and the inclined bottom plate, and the end parts of the top plate, the middle web plate, the flat bottom plate, the inclined bottom plate and the edge web plate are welded in sequence to form a box-type structure; the lengths of the top plate and the flat bottom plate of the first steel box girder along the transverse bridge direction are both greater than the lengths of the top plate and the flat bottom plate of the second steel box girder along the transverse bridge direction; and a plurality of transverse clapboards are arranged between the middle web plate and the side web plate at intervals along the longitudinal bridge direction.
In some embodiments, stiffening ribs are welded to the top plate, the central web, the flat bottom plate, the inclined bottom plate, the side webs and the diaphragm.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a cable-stayed bridge with highway and railway in same layer asymmetric arrangement, as a main beam comprises a first steel box girder and a second steel box girder which are respectively positioned at two opposite sides of a bridge tower, the constant load on the first steel box girder is greater than the constant load on the second steel box girder, the length of the first steel box girder along the transverse bridge direction is less than that of the second steel box girder along the transverse bridge direction, the distance between the first steel box girder and the bridge tower is a first preset distance, the distance between the second steel box girder and the bridge tower is a second preset distance, the constant load action line of the main beam is coincided with the axial line of the bridge tower in the transverse bridge direction by adjusting the first preset distance and the second preset distance, therefore, the structure can eliminate the unbalance load effect caused by the transverse constant load asymmetric arrangement, and the asymmetric structure is skillfully adopted to achieve the transverse self-balancing effect of the main tower aiming at the characteristics of highway and railway loads, the structure stress is reasonable, the unbalance loading effect caused by the asymmetrical arrangement of the transverse constant load is eliminated, the structure is simple, and the economical efficiency is good.
The embodiment of the invention provides a cable-stayed bridge with roads and railways in the same layer of asymmetric arrangement, because a first steel box girder and a second steel box girder are respectively positioned at two opposite sides of a bridge tower, a railway is arranged on the first steel box girder, and a road is arranged on the second steel box girder, the crossing of the road and the railway wiring is avoided, compared with the bridge in the same layer of symmetric arrangement, the requirement of wiring space is reduced, and the adaptability to the terrain of a bridge position is strong; the bridge has the advantages of low bridge deck elevation, small approach gradient on two sides of the main bridge, short length, small occupied area and less total engineering investment.
The embodiment of the invention provides a cable-stayed bridge with roads and railways arranged in the same layer asymmetrically, because the distribution of live load action in the transverse bridge direction is similar to the second-stage dead load, the live load of a train on a first steel box girder is larger, but the resultant action line is closer to the axis of a bridge tower; the automobile live load on the second steel box girder is smaller, but the resultant force action line is far away from the axis of the bridge tower. Therefore, the deformation and torsion of the transverse bridge generated by the structure under the live load action are reduced.
The embodiment of the invention provides a cable-stayed bridge with roads and irons in the same layer in asymmetric arrangement, and the cable-stayed bridge adopts the combination of a single-column tower and a transverse stabilizing cable, so that compared with a double-column tower, the cable-stayed bridge effectively reduces the material consumption and the foundation scale of the bridge tower under the condition of meeting the requirements on structural strength, rigidity and stability, thereby reducing the manufacturing cost and having better economic benefit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cable-stayed bridge with roads and railways arranged asymmetrically in the same layer according to an embodiment of the present invention;
fig. 2 is a top view of a cable-stayed bridge with roads and railways arranged asymmetrically in the same layer according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a main beam of a cable-stayed bridge with roads and railways arranged asymmetrically on the same layer according to an embodiment of the present invention.
In the figure:
1. a bridge tower; 11. lowering the tower column; 111. the lower section of the lower tower column; 112. an upper section of the lower tower column; 12. a lower cross beam; 13. mounting the tower column; 14. a cross brace; 141. an anchoring point; 15. a transverse stabilizing cable; 151. an upper lateral stabilizing cable; 152. a lower lateral stabilizing cable; 2. a main beam; 21. a first steel box girder; 211. a top plate; 212. a flat bottom plate; 213. a sloping floor; 214. a middle web plate; 215. a side web; 216. a diaphragm plate; 22. a second steel box girder; 23. a cross beam; 3. a stay cable; 4. and a transverse wind-resistant support.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a cable-stayed bridge with roads and railways in the same layer asymmetric arrangement, which can solve the problems that a main beam and a main tower of the cable-stayed bridge in the related art generate transverse bridge deformation under the constant load effect, the structure is complex, and the economical efficiency is reduced.
Referring to fig. 1, a cable-stayed bridge with asymmetric arrangement of the public and railway in the same layer provided by the embodiment of the present invention may include: a single or a plurality of bridge towers 1 arranged along the longitudinal bridge direction, wherein in the embodiment, the structure of the bridge tower 1 is a single-column tower; the main beam 2, the main beam 2 may include a first steel box girder 21 and a second steel box girder 22, the first steel box girder 21 may be used for arranging railways, the second steel box girder 22 may be used for arranging highways, in this embodiment, two railway lines are arranged on the first steel box girder 21, four-lane highways are arranged on the second steel box girder 22, in other embodiments, other numbers of railway lines may be arranged on the first steel box girder 21 and other numbers of highways are arranged on the second steel box girder 22 according to practical calculation conditions, the constant load on the first steel box girder 21 may be greater than the constant load on the second steel box girder 22, the first steel box girder 21 and the second steel box girder 22 may be respectively located at two opposite sides of the bridge tower 1, the length of the first steel box girder 21 in the transverse bridge direction may be smaller than the length of the second steel box girder 22 in the transverse bridge direction, that is, the center of gravity of the first steel box girder 21 is closer to the axis of the bridge tower 1, and the center of the second steel box girder 22 is farther from the axis of the bridge tower 1, the distance between the first steel box girder 21 and the bridge tower 1 along the transverse bridge direction can be a first preset distance, the distance between the second steel box girder 22 and the bridge tower 1 along the transverse bridge direction can be a second preset distance, according to the lever principle, the first preset distance and the second preset distance can be adjusted according to actual conditions, so that the stress on two opposite sides of the bridge tower 1 is balanced, the constant load action line on the main girder 2 is superposed with the axis of the bridge tower 1 in the transverse bridge direction, and the constant load action line refers to the combined action line of the dead weight of the first steel box girder 21, the second-stage constant load on the first steel box girder 21, the dead weight of the second steel box girder 22 and the second-stage constant load on the second steel box girder 22; the top of the bridge tower 1 can be respectively connected with the two sides of the main beam 2 in the transverse bridge direction through the plurality of stay cables 3, and the specifications and initial tensions of the plurality of stay cables 3 are the same, so that the effect of transverse self-balance of the bridge tower 1 can be achieved by skillfully adopting an asymmetric structure, and the unbalance loading effect caused by transverse asymmetric arrangement of the highway and railway is eliminated; meanwhile, the train live load on the first steel box girder 21 is larger, but the resultant action line of the train live load is closer to the axis of the bridge tower 1; the automobile live load on the second steel box girder 22 is small, but the automobile live load resultant force action line is far from the axis of the pylon 1, so that the transverse bridge deformation and torsion effect of the cable-stayed bridge structure generated under the live load action are small.
Referring to fig. 1, in some embodiments, the bridge tower 1 may be a single column tower, and the bridge tower 1 may include: the top of the lower tower column 11 can be supported on a cable-stayed bridge, the bottom of the lower tower column 11 can be provided with a tower seat, and the tower seat can diffuse the force at the tower bottom of the lower tower column 11 to a bearing platform; the lower cross beam 12 can be fixed at the top of the tower column, a first steel box girder 21 and a second steel box girder 22 can be arranged on the lower cross beam 12 at intervals along the transverse bridge direction, a plurality of vertical supports can be arranged between the lower cross beam 12 and the first steel box girder 21 and the second steel box girder 22 respectively, the vertical supports can support the first steel box girder 21 and the second steel box girder 22, the width of the lower cross beam 12 on one side of the first steel box girder 21 is smaller than that on one side of the second steel box girder 22, and the arrangement of the position of the lower cross beam 12 can be matched with the lengths of the first steel box girder 21 and the second steel box girder 22 along the transverse bridge direction; go up the column 13, go up the column 13 and can pass the clearance between first steel box girder 21 and the second steel box girder 22 to fixed with lower beam 12, the axis coincidence of last column 13 and lower column 11, consequently, first steel box girder 21 and second steel box girder 22 are located the relative both sides of last column 13 and lower column 11, adopt single-column tower and compare with the double-column tower, under the condition that satisfies structural strength, rigidity, stability, the material quantity and the basic scale of bridge tower 1 have been reduced effectively, thereby reduced the cost, better economic benefits has.
Referring to fig. 1, in some embodiments, the bridge tower 1 may further comprise: at least two cross braces 14, wherein the two cross braces 14 can be respectively arranged at two opposite ends of the lower cross beam 12, and the cross braces 14 can be inserted into the lower cross beam 12 and fixed with the lower cross beam 12; a plurality of transverse stabilizing cables 15, the transverse stabilizing cables 15 may include an upper transverse stabilizing cable 151 and a lower transverse stabilizing cable 152, in this embodiment, one transverse stabilizing cable 15 is provided on each of opposite sides of the bridge tower 1, in other embodiments, other numbers of transverse stabilizing cables 15 may be provided, one end of the upper transverse stabilizing cable 151 may be anchored on the upper portion of the upper tower 13, the other end of the upper transverse stabilizing cable 151 may be connected to the anchoring point 141 on the wale 14, one end of the lower transverse stabilizing cable 152 may be connected to the anchoring point 141 on the wale 14, and the other end of the lower transverse stabilizing cable 152 may be anchored on the lower tower 11, so that the upper tower 13, the lower tower 11, the lower beam 12, the wale 14 and the transverse stabilizing cables 15 form a triangular truss in the transverse bridge direction, under the load of transverse wind, live load and the like, the transverse stabilizing cable on one side is pulled, the upper tower 13 and the lower beam 12 are compressed, the transverse rigidity of the bridge tower 1 is effectively improved, the bending moment of the upper tower column 13 is converted into axial pressure to a certain extent, the stress condition of the upper tower column 13 is improved, the structural size of the upper tower column 13 can be reduced, the self weight of the structure is reduced, the cross section area of the tower column can be reduced, and the manufacturing cost is saved.
Referring to fig. 1, in some embodiments, the distance between the anchor point 141 on one side of the first steel box girder 21 and the bridge tower 1 may be a first distance, the distance between the anchor point 141 on one side of the second steel box girder 22 and the bridge tower 1 may be a second distance, and the first distance may be smaller than the second distance, that is, the triangle formed by the upper lateral stabilizing cables 151 and the wales 14 on opposite sides of the bridge tower 1 and the upper tower column 13 and the lower beam 12, respectively, is an asymmetric triangle, and the triangle formed by the lower lateral stabilizing cables 152 and the wales 14 on opposite sides of the bridge tower 1 and the lower tower column 11 and the lower beam 12, respectively, is also an asymmetric triangle, such a structure may be cooperated with the first steel box girder 21 and the second steel box girder 22 which are asymmetrically designed, so as to make the structure of the cable-stayed bridge more stable.
Referring to fig. 1, in some embodiments, the lower tower 11 may include: a lower section 111 of the lower tower column, the bottom of which can be provided with a tower seat; the upper end of lower pylon 11, the one end of lower pylon upper segment 112 is fixed in the top surface of lower pylon lower segment 111, the other end of lower pylon upper segment 112 is fixed with bottom end rail 12, and support in bottom end rail 12 below, the cross sectional area of lower pylon upper segment 112 is less than the cross sectional area of lower pylon lower segment 111, in this embodiment, downside transverse stabilization cable 152 is located the cross sectional segmentation department of lower pylon 11 with the anchor position of lower pylon 11, the pylon cross sectional area can be reduced when the lower pylon 11 of the design of above-mentioned structure plays the effect of supporting the cable-stay bridge, practice thrift the cost.
Referring to fig. 1, in some embodiments, a transverse wind-resistant support 4 may be disposed between each of the first steel box girder 21 and the second steel box girder 22 and the bridge tower 1, that is, a transverse wind-resistant support 4 is disposed between the first steel box girder 21 and the upper tower 13, a transverse wind-resistant support 4 is disposed between the second steel box girder 22 and the upper tower 13, and the transverse wind-resistant support 4 may perform a pushing action on the first steel box girder 21 and the second steel box girder 22 in a transverse direction, and may prevent the first steel box girder 21 and the second steel box girder 22 from transversely shaking in the transverse direction under the load actions of transverse wind, live load, and the like.
Referring to fig. 1, in some embodiments, a plurality of small longitudinal beams may be disposed on the first steel beam box along a longitudinal direction of the railway track, the small longitudinal beams are disposed directly below each railway track, and the small longitudinal beams are of an inverted T-shaped structure, and the small longitudinal beams are welded and fixed to the first steel beam box, so that local rigidity of the railway deck can be ensured.
Referring to fig. 1, in some embodiments, a cross beam 23 may be disposed between the first steel box girder 21 and the second steel box girder 22 in the transverse bridge direction, and the cross beam 23 may connect the first steel box girder 21 and the second steel box girder 22, in this embodiment, the cross beam 23 may connect the first steel box girder 21 and the second steel box girder 22 by bolts, in other embodiments, the cross beam 23 may connect the first steel box girder 21 and the second steel box girder 22 by welding or other methods, and a plurality of cross beams 23 may be disposed between the first steel box girder 21 and the second steel box girder 22 in the longitudinal bridge direction at intervals.
Referring to fig. 1, in some embodiments, the first steel box girder 21 and the second steel box girder 22 have the same structure, and each of the first steel box girder 21 and the second steel box girder 22 may include: the top plate 211, the flat bottom plate 212 and the inclined bottom plate 213 are arranged along the longitudinal bridge direction, the flat bottom plate 212 and the inclined bottom plate 213 can be positioned on the same side of the top plate 211, a middle web 214 can be arranged between the top plate 211 and the flat bottom plate 212, a side web 215 can be arranged between the top plate 211 and the inclined bottom plate 213, and the ends of the top plate 211, the middle web 214, the flat bottom plate 212, the inclined bottom plate 213 and the side web 215 can be welded in sequence to form a box-type structure; the length of the top plate 211 and the flat bottom plate 212 of the first steel box girder 21 in the transverse bridge direction can be greater than the length of the top plate 211 and the flat bottom plate 212 of the second steel box girder 22 in the transverse bridge direction; a plurality of transverse clapboards 216 can be arranged between the middle web 214 and the side web 215 at intervals along the longitudinal bridge direction, in the embodiment, the transverse clapboards 216 are variable-height transverse clapboards 216, and one transverse clapboard 216 is arranged at intervals of 3m along the longitudinal bridge direction, so that transverse loads on the first steel box girder 21 and the second steel box girder 22 can be transferred.
Referring to fig. 1, in some embodiments, stiffening ribs may be welded to the top plate 211, the middle web 214, the flat bottom plate 212, the inclined bottom plate 213, the side webs 215, and the diaphragm 216 to ensure local stress and stability of the steel plate.
The principle of the cable-stayed bridge with the roads and the railways in the same layer in asymmetric arrangement provided by the embodiment of the invention is as follows:
because the bridge tower 1 is a single-column tower, the main beam 2 comprises a first steel box girder 21 and a second steel box girder 22, a railway can be arranged on the first steel box girder 21, a highway can be arranged on the second steel box girder 22, the first steel box girder 21 and the second steel box girder 22 are respectively positioned at two opposite sides of the bridge tower 1, the constant load on the first steel box girder 21 can be larger than the constant load on the second steel box girder 22, when the first steel box girder 21 and the second steel box girder 22 are designed, the length of the first steel box girder 21 along the transverse bridge direction can be designed to be smaller than the length of the second steel box girder 22 along the transverse bridge direction, namely the constant load acting line on the first steel box girder 21 is closer to the axis of the bridge tower 1, the constant load acting line on the second steel box girder 22 is farther from the axis of the bridge tower 1, the distance between the first steel box girder 21 and the bridge tower 1 can be a first preset distance, and the distance between the second steel box girder 22 and the bridge tower 1 can be a second preset distance, according to the lever principle, the first preset distance and the second preset distance can be adjusted according to actual conditions, so that the stress on the two opposite sides of the bridge tower 1 is balanced, and the dead load action line of the main beam 2 is superposed with the axis of the bridge tower 1 in the transverse bridge direction, so that the unbalance loading effect caused by transverse asymmetrical arrangement of the highway and the railway can be eliminated, and the bridge has the advantages of simple structure, definite force transfer and high economy.
Meanwhile, the train live load on the first steel box girder 21 is larger, but the resultant action line of the train live load is closer to the axis of the bridge tower 1; the automobile live load on the second steel box girder 22 is smaller, but the resultant force action line of the automobile live load is far away from the axis of the bridge tower 1, so that the transverse bridge deformation and the torsion effect generated by the structure of the cable-stayed bridge under the action of the train and the automobile live load are smaller in the embodiment of the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a highway-railway with layer asymmetric cable-stay bridge who arranges which characterized in that, it includes:
a single or a plurality of pylons (1) arranged in the longitudinal bridge direction;
a main beam (2) comprising a first steel box beam (21) for laying railways and a second steel box beam (22) for laying highways, the constant load on the first steel box girder (21) is larger than the constant load on the second steel box girder (22), the first steel box girder (21) and the second steel box girder (22) are respectively positioned at two opposite sides of the bridge tower (1), the length of the first steel box girder (21) along the transverse bridge direction is less than that of the second steel box girder (22) along the transverse bridge direction, the distance between the first steel box girder (21) and the bridge tower (1) is a first preset distance, the distance between the second steel box girder (22) and the bridge tower (1) is a second preset distance, the constant-load action line of the main beam (2) is overlapped with the axis of the bridge tower (1) in the transverse bridge direction by adjusting the first preset distance and the second preset distance;
and a plurality of stay cables (3) connecting the bridge tower (1) and the main beam (2) transversely and bilaterally.
2. The cable-stayed bridge with asymmetrical arrangement of the highway and railway layers as claimed in claim 1, wherein the bridge tower (1) comprises:
a lower tower (11) for supporting the cable-stayed bridge;
the lower cross beam (12) is fixed to the top of the lower tower column (11), the first steel box girder (21) and the second steel box girder (22) are arranged on the lower cross beam (12) at intervals along the transverse bridge direction, and the width of the lower cross beam (12) on one side of the first steel box girder (21) is smaller than that on one side of the second steel box girder (22);
and the upper tower column (13) penetrates through a gap between the first steel box girder (21) and the second steel box girder (22) and is fixed with the lower cross beam (12).
3. The cable-stayed bridge with asymmetrical arrangement of the highway and railway layers as claimed in claim 2, wherein the bridge tower (1) further comprises:
the two cross braces (14) are respectively arranged at two opposite ends of the lower cross beam (12) and are fixed with the lower cross beam (12);
a plurality of transverse stabilizing cables (15), it includes upside transverse stabilizing cable (151) and downside transverse stabilizing cable (152), the one end anchor of upside transverse stabilizing cable (151) is in the upper portion of last pylon (13), the other end of upside transverse stabilizing cable (151) is connected the anchor point (141) of stull (14), the one end of downside transverse stabilizing cable (152) is connected the anchor point (141) of stull (14), the other end anchor of downside transverse stabilizing cable (152) in lower pylon (11).
4. The cable-stayed bridge with the asymmetrical arrangement of the highway and railway layers as claimed in claim 3, wherein:
a first distance is reserved between the anchoring point (141) on one side of the first steel box girder (21) and the bridge tower (1), a second distance is reserved between the anchoring point (141) on one side of the second steel box girder (22) and the bridge tower (1), and the first distance is smaller than the second distance.
5. The cable-stayed bridge with asymmetrical arrangement of the highway and railway layers as claimed in claim 2, wherein the lower tower (11) comprises:
a lower section (111) of the lower tower column, the bottom of which is provided with a tower seat;
one end of the lower tower column upper section (112) is fixed on the top surface of the lower tower column lower section (111), the other end of the lower tower column upper section (112) is fixed with the lower cross beam (12), and the cross section area of the lower tower column upper section (112) is smaller than that of the lower tower column lower section (111).
6. The cable-stayed bridge with the asymmetrical arrangement of the highway and railway layers as claimed in claim 1, wherein:
and a transverse wind-resistant support (4) is arranged between the first steel box girder (21) and the second steel box girder (22) and the bridge tower (1) respectively.
7. The cable-stayed bridge with the asymmetrical arrangement of the highway and railway layers as claimed in claim 1, wherein:
a plurality of small longitudinal beams are arranged on the first steel box girder (21) along the longitudinal direction of the railway track.
8. The cable-stayed bridge with the asymmetrical arrangement of the highway and railway layers as claimed in claim 1, wherein the main beam (2) further comprises:
the crossbeam (23), its connect first steel box girder (21) with second steel box girder (22), crossbeam (23) are located first steel box girder (21) with between second steel box girder (22), and be equipped with a plurality ofly along the longitudinal bridge to the interval crossbeam (23).
9. The cable-stayed bridge with asymmetric arrangement of highway and railway same layers as the claim 1, characterized in that the first steel box girder (21) and the second steel box girder (22) have substantially the same structure, and the first steel box girder (21) and the second steel box girder (22) both comprise:
the structure comprises a top plate (211), a flat bottom plate (212) and an inclined bottom plate (213) which are arranged along a longitudinal bridge direction, wherein the flat bottom plate (212) and the inclined bottom plate (213) are positioned on the same side of the top plate (211), a middle web plate (214) is arranged between the top plate (211) and the flat bottom plate (212), a side web plate (215) is arranged between the top plate (211) and the inclined bottom plate (213), and the ends of the top plate (211), the middle web plate (214), the flat bottom plate (212), the inclined bottom plate (213) and the side web plate (215) are welded in sequence to form a box-type structure;
the length of the top plate (211) and the flat bottom plate (212) of the first steel box girder (21) along the transverse bridge direction is larger than that of the top plate (211) and the flat bottom plate (212) of the second steel box girder (22) along the transverse bridge direction;
a plurality of transverse clapboards (216) are arranged between the middle web (214) and the side web (215) at intervals along the longitudinal bridge direction.
10. The cable-stayed bridge with the asymmetrical arrangement of the highway and railway layers as claimed in claim 9, wherein:
stiffening ribs are welded on the top plate (211), the middle web plate (214), the flat bottom plate (212), the inclined bottom plate (213), the side web plate (215) and the diaphragm plate (216).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205191.1A CN113863114B (en) | 2021-10-15 | 2021-10-15 | Cable-stayed bridge with same-layer asymmetric arrangement of male and female railways |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205191.1A CN113863114B (en) | 2021-10-15 | 2021-10-15 | Cable-stayed bridge with same-layer asymmetric arrangement of male and female railways |
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| CN113863114A true CN113863114A (en) | 2021-12-31 |
| CN113863114B CN113863114B (en) | 2023-06-23 |
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|---|---|
| CN113863114B (en) | 2023-06-23 |
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