The Shuttle-shaped Bridge Tower in the Steel Box Girder Cable-stayed Bridge with Parallel Railway and Road Layers

Abstract

The present invention relates to a shuttle-shaped pylon in a highway-railway flat-deck steel box girder cable-stayed bridge, which comprises a pylon column and a supporting foundation. The pylon column has a spindle-shaped structure that is wide in the middle and gradually narrows from top to bottom. Both pylon legs of the pylon column have vertical leg segments with the leg surfaces parallel to the vertical direction, and the vertical leg segments at least cover the position where the main girder is located. In addition, the present invention also relates to a cable-stayed bridge, which comprises a main girder and at least one pylon, and the pylon adopts the shuttle-shaped pylon in the highway-railway flat-deck steel box girder cable-stayed bridge as described above. The pylon column with a spindle-shaped structure resembles a fish or a boat, and has good landscape effect. By designing vertical leg segments for the pylon legs, the pylon column has a vertical transition type within the range of the main girder, and the design effect of the pylon vertically passing through the main girder can be achieved. The pylon legs vertically pass through the main girder deck, which can reduce the width of the main girder of the pylon-through cable-stayed bridge and has good economy.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and particularly relates to a shuttle-shaped pylon in a combined highway-railway flat-deck steel box girder cable-stayed bridge and a cable-stayed bridge adopting the pylon. Background Art

[0002] At present, common pylon types of cable-stayed bridges include H-shaped, A-shaped, inverted Y-shaped, diamond-shaped, etc. In a combined highway-railway flat-deck cable-stayed bridge, the design scheme of passing the main girder through the middle of the pylon has a good application effect. However, the existing pylon types have the following problems in the application of passing the main girder through the middle of the pylon: The H-shaped pylon can meet the design requirements of vertically passing the main girder through the middle of the pylon, and the cross-sectional width of the main girder is relatively small, but the shape of the H-shaped pylon is relatively conventional, the landscape property is slightly poor, the lateral stability of the pylon and the lateral stiffness of the main girder are relatively small, and the scale of the pylon foundation is relatively large; When using an A-shaped, inverted Y-shaped or diamond-shaped pylon, the main girder passes through the middle of the pylon obliquely (i.e., has an angle with the main girder deck). To meet the maintenance requirements, the width of the main girder needs to be increased by about 2 m compared with the scheme of vertically passing through the pylon, and the economy is relatively poor. Summary of the Invention

[0003] The invention relates to a shuttle-shaped pylon in a combined highway-railway flat-deck steel box girder cable-stayed bridge and a cable-stayed bridge adopting the pylon, which can at least solve some defects of the prior art.

[0004] The invention relates to a shuttle-shaped pylon in a combined highway-railway flat-deck steel box girder cable-stayed bridge, which comprises a pylon column and a supporting foundation. The pylon column has a spindle-shaped structure that is wide in the middle and gradually narrows from top to bottom. Both tower legs of the pylon column have vertical leg segments with the leg surfaces parallel to the vertical direction, and the vertical leg segments at least cover the position where the main girder is located.

[0005] As one of the embodiments, a lower cross beam for installing the main girder is arranged at the lower part of the pylon column, and two ends of the lower cross beam are respectively connected with the two tower legs of the pylon column.

[0006] As one of the embodiments, corbels for installing side boxes of the main girder are arranged on the outer edges of both tower legs.

[0007] As one of the embodiments, an upper cross beam is arranged at the upper part of the pylon column, and two ends of the upper cross beam are respectively connected with the two tower legs.

[0008] As one of the embodiments, an upper connecting plate is arranged at the top of the upper cross beam, and the upper connecting plate is respectively connected with the inner leg surfaces of the two tower legs; and / or, a lower connecting plate is arranged at the bottom of the upper cross beam, and the lower connecting plate is respectively connected with the inner leg surfaces of the two tower legs.

[0009] As one of the embodiments, when the upper connecting plate is provided, the upper connecting plate has a trough-shaped structure and forms a spindle-shaped cavity with the two tower legs.

[0010] The present invention also relates to a cable-stayed bridge, comprising a main girder and at least one bridge tower, and the bridge tower adopts the shuttle-shaped bridge tower in the above-mentioned railway-highway flat-deck steel box girder cable-stayed bridge.

[0011] As one of the implementation manners, the main girder has a hollow-through area in the middle, and two tower legs pass through the hollow-through area.

[0012] The present invention has at least the following beneficial effects:

[0013] The tower column with a spindle-shaped structure resembles a fish or a boat, and has good landscape performance. By designing vertical limb segments for the tower legs, the tower column has a vertical transition type within the range of the main girder, and the design effect of the bridge tower vertically passing through the main girder can be achieved. The tower legs vertically pass through the main girder deck, which can reduce the width of the main girder of the cable-stayed bridge with a middle-through type bridge tower, and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 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.

[0015] Figure 1 It is a schematic structural diagram of the cable-stayed bridge provided by the embodiment of the present invention;

[0016] Figure 2 and Figure 3 It is a schematic structural diagram of the bridge tower provided by the embodiment of the present invention

[0017] Figure 4 It is a schematic structural diagram of the main girder with a middle-through type by the railway-highway flat-deck bridge tower provided by the embodiment of the present invention;

[0018] Figure 5 It is a schematic structural diagram of the standard section of the main girder provided by the embodiment of the present invention;

[0019] Figure 6 It is a schematic structural diagram of the variable section of the main girder provided by the embodiment of the present invention

[0020] Figure 7 It is a schematic structural diagram of the middle-through transition section of the bridge tower provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Embodiment 1

[0023] As Figure 2 and Figure 3 , Embodiment 1 of the present invention provides a bridge tower 2, including a tower column and a supporting foundation 22. The tower column has a spindle-shaped structure that is wider in the middle and gradually tapers towards the top and bottom. Both tower legs 21 of the tower column have vertical leg segments with the limb surfaces parallel to the vertical direction, and the vertical leg segments at least cover the position where the main girder 1 is located.

[0024] For the tower column with the spindle-shaped structure, its middle area is relatively wide, and the tower column gradually tapers towards the top and bottom directions from the middle area; that is, the cross-section (parallel to the vertical direction) of the tower column is spindle-shaped. This spindle-shaped tower column resembles a fish or a boat, with good landscape effect; the stay cables 3 are spatial cables (different from the planar cables of the H-shaped bridge tower), which can enable the main girder 1 to obtain a higher torsional natural vibration frequency and increase its critical flutter wind speed.

[0025] The above-mentioned supporting foundation 22 can adopt conventional structures such as a caisson, which will not be elaborated here. The lower part of the tower column narrows at the position of the supporting foundation 22, which can reduce the lateral dimension of the bridge tower supporting foundation 22, reduce the wave and current forces borne by the supporting foundation 22 and the size of the cofferdam structure, and reduce the impact on factors such as the red line of surrounding islands, with good economy and environmental protection.

[0026] By designing vertical leg segments for the tower legs 21, the tower column has a vertical transition form within the range of the main girder 1, which can achieve the design effect of the bridge tower 2 vertically passing through the main girder 1. The tower legs 21 vertically pass through the deck of the main girder 1, which can reduce the width of the main girder of the through-type cable-stayed bridge with a bridge tower, with good economy.

[0027] In one embodiment, as Figure 2 , a lower cross beam 23 for installing the main girder 1 is provided at the lower part of the tower column, and both ends of the lower cross beam 23 are respectively connected to the two tower legs 21 of the tower column. When the bridge tower 2 adopts the through-main girder scheme, the middle box of the main girder 1 is installed on the lower cross beam 23, and the middle box can be further horizontally connected to the two tower legs 21. The lower cross beam 23 not only plays a role in supporting and installing the main girder 1, but also can improve the structural integrity and cooperative force-bearing performance of the two tower legs 21, ensuring the operation reliability of the tower column.

[0028] Further preferably, as Figure 2 , brackets 24 for installing the side boxes of the main girder are provided on the outer edges of both tower legs 21. This structure can better meet the design requirements of the bridge tower 2 passing through the main girder 1. By supporting the side boxes of the main girder 1 through the brackets 24, the installation structural reliability and operation safety of the main girder 1 in the area of the bridge tower 2 can be ensured.

[0029] Further preferably, as Figure 2 and Figure 3, an upper cross beam 25 is provided at the upper part of the tower column, and both ends of the upper cross beam 25 are respectively connected to the two tower legs 21 of the tower column. By connecting the upper parts of the two tower legs 21 into one body through the upper cross beam 25, the structural integrity and cooperative stress-bearing capacity of the two tower legs 21 can be improved. In particular, the area near the upper cross beam 25 is the tensioning area of the stay cables 3, thus ensuring the operation reliability of the tower column; and due to the narrowing of the tower top, the length of the upper cross beam 25 is small, and its transverse connection effect is better.

[0030] Further preferably, as Figure 2 , an upper connecting plate 26 is provided at the top of the upper cross beam 25, and the upper connecting plate 26 is respectively connected to the inner limb surfaces of the two tower legs 21; and / or, a lower connecting plate 27 is provided at the bottom of the upper cross beam 25, and the lower connecting plate 27 is respectively connected to the inner limb surfaces of the two tower legs 21. By providing the upper connecting plate 26 / lower connecting plate 27, the connection reliability and structural integrity between the upper cross beam 25 and the two tower legs 21 can be further improved; at the same time, through the outer shape design of the connecting plate, the aesthetics of the tower column can be further improved. For example, the upper connecting plate 26 is in a groove structure and forms a spindle-shaped cavity with the two tower legs 21.

[0031] Embodiment 2

[0032] As Figure 1 , an embodiment of the present invention provides a cable-stayed bridge, including a main beam 1 and at least one bridge tower 2, and the bridge tower 2 adopts the bridge tower 2 provided in the first embodiment above.

[0033] In one of the embodiments, the above cable-stayed bridge is a cable-stayed bridge with the main beam passing through the bridge tower. Correspondingly, the main beam 1 has a hollow through area, and the two tower legs 21 pass through the hollow through area. Obviously, the vertical limb segments of the tower legs 21 are arranged in the hollow through area.

[0034] Embodiment 3

[0035] An embodiment of the present invention provides a main beam 1 passing through the bridge tower, which can be applied to the second embodiment above.

[0036] As Figure 4 , the main beam 1 passing through the bridge tower includes a plurality of main beam standard segments 11 and at least one bridge tower passing transition segment 12 for the bridge tower 2 to pass through. Each bridge tower passing transition segment 12 is connected to the adjacent main beam standard segment 11 through a main beam change segment 13. Among them, the main beam standard segment 11 adopts a cantilever steel box girder, the bridge tower passing transition segment 12 adopts a separated steel box girder, and the main beam change segment 13 adopts an integral steel box girder.

[0037] Understandably, the above-mentioned standard sections 11 of the main girders are the same as the number of spans of the bridge and are arranged in one-to-one correspondence; a cable-stayed bridge generally has multiple bridge towers 2, and correspondingly, there are multiple transition sections 12 passing through the bridge towers; obviously, there is a standard section 11 of the main girder on each side of the transition section 12 passing through each bridge tower, so a variable section 13 of the main girder is connected to each end of the transition section 12 passing through each bridge tower.

[0038] The cantilever steel box girder, the integral steel box girder, and the separated steel box girder are all existing steel box girder structural forms in the art, and the specific structures are not described here. For the connection between the cantilever steel box girder and the integral steel box girder, and the connection between the integral steel box girder and the separated steel box girder, conventional steel box girder segment connection methods can be used, which are not described in detail here.

[0039] The transition section 12 passing through the bridge tower can be passed through the bridge tower 2 provided in the first embodiment; in one embodiment, such as Figure 7 , the transition section 12 passing through the bridge tower includes a middle box girder body 121 for respectively connecting to the two side tower legs 21 of the bridge tower 2 and two groups of side box girder bodies 122 for respectively installing on the outer sides of the corresponding side tower legs 21, that is, the middle box girder body 121 is arranged between the left tower leg 21 and the right tower leg 21 of the bridge tower 2, and the middle box girder body 121 is transversely connected to the left tower leg 21 and the right tower leg 21 respectively, so the hollow through area is formed between the middle box girder body 121 and the side box girder bodies 122. Using the tower leg 21 as the connection node of the separated steel box girder can ensure the reliability of the installation structure of the transition section 12 passing through the bridge tower. Further preferably, the outer shape of the side box girder body 122 is the same as the cantilever of the standard section 11 of the main girder, which can improve the aesthetic degree of the bridge appearance; understandably, the variable section 13 of the main girder is also preferably the same as the outer shape of the standard section 11 of the main girder; using beam structures with the same outer shape can not only ensure the aesthetic effect, but also simplify the design and construction difficulty accordingly, and make the stiffness transition smooth between each beam section.

[0040] Such as Figure 4 and Figure 6, the above-mentioned main girder variable section 13 includes a first beam body and two groups of second beam bodies horizontally arranged at both ends of the first beam body. Among them, the first beam body includes a top plate, a bottom plate, and two end longitudinal beams distributed between the top plate and the bottom plate. The upper and lower ends of the end longitudinal beams are respectively connected to the top plate and the bottom plate. According to needs, a middle longitudinal beam of the variable section can be further arranged; both end longitudinal beams have inclined sections to facilitate connection with the standard longitudinal beams on the corresponding side of the main girder standard section 11. The two inclined sections are arranged oppositely to form a trumpet-shaped structure, and the large opening end of the trumpet-shaped structure faces the main girder standard section 11 on the corresponding side; the other end of the inclined section (i.e., the small opening end of the trumpet-shaped structure) can be directly connected to the middle box longitudinal beam on the middle box girder body 121 passing through the transition section 12 in the adjacent bridge tower. In another embodiment, the two end longitudinal beams also have transition connection sections parallel to the longitudinal direction of the bridge, and the transition connection sections are respectively connected to the middle box longitudinal beam on the adjacent middle box girder body 121 and the corresponding inclined section. The variable section side longitudinal beam on the second beam body can be designed to be parallel to the longitudinal direction of the bridge, and its two ends are respectively connected to the standard longitudinal beam on the adjacent main girder standard section 11 and the side box longitudinal beam on the adjacent side box girder body 122.

[0041] The main girder standard section 11 adopts a cantilever steel box girder, which can improve the flexural and torsional stiffness of the main girder 1, as well as the wind resistance and wind turbine bridge performance. At the same time, it effectively reduces the steel consumption of the main girder 1 and ensures the economy of the main girder 1 passing through the bridge tower.

[0042] The bridge tower passing-through transition section 12 adopts a separated steel box girder, and the organic and smooth connection between the bridge tower passing-through transition section 12 and the main girder standard section 11 is realized through the main girder variable section 13 of the integral steel box girder structure, solving the key technical problem that the traditional cantilever steel box girder section cannot be applied to the passing-through scheme of the cable-stayed bridge tower 2.

[0043] 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 in the protection scope of the present invention.

Claims

1. A cable-stayed bridge, comprising a main girder and at least one bridge tower, characterized in that: The pylon adopts a shuttle-shaped pylon in a combined highway-railway flat-deck steel box girder cable-stayed bridge. The shuttle-shaped pylon in the combined highway-railway flat-deck steel box girder cable-stayed bridge includes tower columns and a supporting foundation. The tower columns are in a shuttle-shaped structure that is wide in the middle and gradually narrows from top to bottom. Each of the two tower legs of the tower columns has a vertical limb segment with a limb surface parallel to the vertical direction, and the vertical limb segment at least covers the position where the main girder is located. The main girder includes a plurality of main girder standard segments and at least one pylon-through transition segment for the pylon to pass through. The number of the main girder standard segments is the same as that of the bridge spans and they are configured in one-to-one correspondence. Each pylon-through transition segment is connected to an adjacent main girder standard segment through a main girder transition segment. Among them, the main girder standard segment adopts a cantilevered steel box girder, the pylon-through transition segment adopts a separated steel box girder, and the main girder transition segment adopts an integral steel box girder.

2. The cable-stayed bridge according to claim 1, characterized in that: A lower cross beam for installing the main girder is provided at the lower part of the tower column, and two ends of the lower cross beam are respectively connected to the two tower legs of the tower column.

3. The cable-stayed bridge according to claim 2, characterized in that: Corbels for installing the side boxes of the main girder are provided at the outer edges of the two tower legs.

4. The cable-stayed bridge according to claim 1, characterized in that: An upper cross beam is provided at the upper part of the tower column, and two ends of the upper cross beam are respectively connected to the two tower legs.

5. The cable-stayed bridge according to claim 4, wherein: An upper connecting plate is provided at the top of the upper cross beam, and the upper connecting plate is respectively connected to the inner limb surfaces of the two tower legs; and / or a lower connecting plate is provided at the bottom of the upper cross beam, and the lower connecting plate is respectively connected to the inner limb surfaces of the two tower legs.

6. The cable-stayed bridge according to claim 5, wherein: When the upper connecting plate is provided, the upper connecting plate is in a trough-shaped structure and forms a shuttle-shaped cavity with the two tower legs.

7. The cable-stayed bridge according to claim 1, wherein: The main girder has a hollow-through area, and the two tower legs pass through the hollow-through area.

Images