Top structure of steel tube concrete composite tower, steel tube concrete composite tower and bridge

Abstract

The application relates to a top structure of a steel pipe concrete composite tower, the steel pipe concrete composite tower and a bridge, the top structure comprising a stiff skeleton column and a steel box beam, the steel box beam comprising a bottom steel plate and a top steel plate, the main steel pipe of the stiff skeleton column being connected to the bottom of the bottom steel plate, longitudinal webs and transverse webs being connected between the top steel plate and the bottom steel plate, first through holes being arranged on the bottom steel plate, the top steel plate, the longitudinal webs and the transverse webs respectively, first steel bars being arranged in the first through holes to form PBL shear keys, and the top region of the stiff skeleton column and the steel box beam being wrapped with concrete. The steel box beam, the main steel pipe and the wrapped concrete are connected by the PBL shear keys to form an integral whole, the huge pressure at the cable saddle can be transmitted to the stiff skeleton column, the steel box beam is fixedly connected with the stiff skeleton column, the steel box beam, the main steel pipe and the wrapped concrete work cooperatively, the structure has good integrity, the force transmission of the node is clear, the top structure has simple structure, convenient operation, short construction period and good effect.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to the top structure of a steel-concrete composite tower, the steel-concrete composite tower, and the bridge. Background Technology

[0002] The construction of expressways in the mountainous areas of western my country involves complex terrain with significant elevation differences, resulting in numerous long-span suspension bridges spanning high mountains and deep valleys. However, conventional reinforced concrete bridge towers are not advantageous in terms of seismic performance and construction cost in high-seismic-intensity mountainous areas. The new structural form of steel-concrete composite towers fully utilizes the high strength and ductility of steel-concrete composite materials, offering superior seismic performance. However, currently, there is no reliable structure capable of transferring the enormous pressure at the top of long-span suspension bridge towers to the steel-concrete composite components, limiting its application. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a top structure for a steel-concrete composite tower, a steel-concrete composite tower, and a bridge.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a top structure for a steel-concrete composite tower, comprising a rigid frame column and a steel box girder. The steel box girder includes a bottom steel plate and a top steel plate. The main steel pipe of the rigid frame column is connected to the bottom of the bottom steel plate. A plurality of longitudinal webs and a plurality of transverse webs are connected between the top steel plate and the bottom steel plate. The longitudinal webs are arranged along the bridge direction, and the transverse webs are arranged transversely to the bridge direction. A plurality of first through holes are provided on the bottom steel plate, the top steel plate, the longitudinal webs, and the transverse webs, and first reinforcing bars are inserted into the first through holes to form PBL (Pre-Tensioned Bolted Lock-up) shear keys. The top area of ​​the rigid frame column and the outer surface of the steel box girder are encased in concrete.

[0006] The top structure of the steel-concrete composite tower described in this invention connects the steel box girder, the main steel pipe, and the outer concrete casing into a whole through the PBL shear key. This allows the enormous pressure at the cable saddle supported by the top structure to be transferred to the stiffened frame column, solving the problem of force transmission at the top of the tower of a long-span suspension or cable-stayed steel-concrete composite bridge. It achieves a fixed connection between the steel box girder and the stiffened frame column, with the steel box girder, main steel pipe, and outer concrete casing working collaboratively. The structure has good overall integrity, clear force transmission at the nodes, and the top structure is simple, easy to operate, has a short construction period, and achieves good results.

[0007] As a preferred technical solution of the present invention, the longitudinal web is provided with a plurality of web stiffening ribs, the transverse web is provided with a plurality of web stiffening ribs, the web stiffening ribs are provided with a plurality of first through holes, and the first steel bars are inserted into the first through holes to form PBL shear keys.

[0008] By adopting this structure, the number of PBL shear keys is further increased by setting the web stiffening ribs and the first through holes and perforated first reinforcing bars on them, which helps to strengthen the integrity of the connection between the steel box girder, the main steel pipe and the outer concrete, and to better coordinate the stress.

[0009] As a preferred technical solution of the present invention, the bottom steel plate and the top steel plate are each provided with two cavities, the cavities are spaced apart along the bridge direction, a longitudinal web plate is provided on each side of the cavities along the bridge direction, a transverse web plate is provided at each end of the cavities along the bridge direction, a transverse web plate is provided between the two cavities, and the web plate stiffening ribs are symmetrically arranged on both sides of the longitudinal web plate or symmetrically arranged on both sides of the transverse web plate.

[0010] As a preferred technical solution of the present invention, the bottom of the bottom steel plate is provided with a plurality of first anchor plates, the first anchor plates are inserted into the main steel pipe, the first anchor plates are provided with a plurality of first through holes, and the first reinforcing bars are inserted into the first through holes to form PBL shear keys.

[0011] By adopting this structure, the number of PBL shear keys is further increased by setting the first anchor plate and the first through hole and the perforated first reinforcing bar on it. The PBL shear keys are inserted into the main steel pipe along with the first anchor plate and anchored in the core concrete of the main steel pipe, ensuring the stability of the connection between the main steel pipe and the steel box girder.

[0012] As a preferred technical solution of the present invention, the main steel pipe is provided with a plurality of first steel pipe stiffening ribs on its inner and outer sides respectively. The first steel pipe stiffening ribs on the outer side are provided with a plurality of second through holes and a plurality of third through holes. A second steel bar is inserted through the second through hole to form a PBL shear key, and a third steel bar is inserted through the third through hole to form a PBL shear key. The first steel pipe stiffening ribs on the inner side are provided with a plurality of second through holes.

[0013] As a further preferred technical solution of the present invention, a second steel pipe stiffening rib and a third steel pipe stiffening rib are provided on the outer side of the main steel pipe. The second steel pipe stiffening rib is arranged facing the adjacent main steel pipe. The second steel pipe stiffening rib and the third steel pipe stiffening rib are respectively provided with a plurality of second through holes, a plurality of fourth through holes and a plurality of third through holes. The second steel bar is inserted in the second through hole to form a PBL shear key. The fourth steel bar is inserted in the fourth through hole to form a PBL shear key. The third steel bar is inserted in the third through hole to form a PBL shear key.

[0014] As a further preferred technical solution of the present invention, the third reinforcing bar is a tie bar, which is wrapped around the outer wall of the main steel pipe and passes through the third through hole on the first steel pipe stiffening rib, the third steel pipe stiffening rib and the second steel pipe stiffening rib in sequence before being connected to the bridge tower reinforcing bar.

[0015] This structure, by setting the first steel pipe stiffening rib, the second steel pipe stiffening rib, and the third steel pipe stiffening rib inside and outside the main steel pipe, and forming the PBL shear key, improves the stiffness and local stability of the connection node. The tie rod extends into the core concrete of the bridge tower to connect with the bridge tower reinforcement, ensuring reliable connection between the stiffened skeleton column and the steel box girder and the outer concrete.

[0016] As a preferred technical solution of the present invention, the outer concrete is poured in two stages. The first stage is poured to the area below the top of the main steel pipe, and the second stage is performed after the steel box girder is installed.

[0017] Secondly, the present invention also provides a steel-concrete composite tower, comprising at least two stiffened frame columns, adjacent stiffened frame columns being connected by at least one crossbeam, and the top of the stiffened frame columns being provided with a top structure of the steel-concrete composite tower as described in any of the above claims.

[0018] Thirdly, the present invention also provides a bridge comprising at least one steel-concrete composite tower as described above.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. The present invention discloses a top structure of a steel-concrete composite tower, a steel-concrete composite tower and a bridge thereof. The steel box girder, the main steel pipe and the outer concrete are connected into a whole by the PBL shear key. The huge pressure at the cable saddle supported by the top structure can be transferred to the stiffened frame column stress member. This solves the problem of force transmission at the top of the tower of a long-span suspension or cable-stayed steel-concrete composite bridge. It realizes the fixed connection between the steel box girder and the stiffened frame column. The steel box girder, the main steel pipe and the outer concrete work together. The structure has good integrity and clear force transmission at the nodes. The top structure is simple, easy to operate, has a short construction period and good effect.

[0021] 2. In a preferred embodiment of the present invention, the top structure of a steel-concrete composite tower is provided by setting the web stiffening ribs and the first through holes and the perforated first reinforcing bars thereon, which further increases the number of PBL shear keys, which is beneficial to strengthening the integrity of the connection between the steel box girder, the main steel pipe and the outer concrete, and improving the coordinated stress distribution.

[0022] 3. In a preferred embodiment of the present invention, the top structure of a steel-concrete composite tower is further increased by setting the first anchor plate and the first through hole and the perforated first reinforcing bar thereon. The number of PBL shear keys is further increased. The PBL shear keys are inserted into the main steel pipe along with the first anchor plate and anchored in the core concrete of the main steel pipe to ensure the stability of the connection between the main steel pipe and the steel box girder.

[0023] 4. A preferred embodiment of the present invention is a top structure of a steel-concrete composite tower. By setting the first steel pipe stiffening rib, the second steel pipe stiffening rib, and the third steel pipe stiffening rib inside and outside the main steel pipe, and forming the PBL shear key, the stiffness and local stability of the connection node are improved. The tie rod extends into the core concrete of the bridge tower to connect with the bridge tower reinforcement, ensuring reliable connection between the stiffened frame column and the steel box girder and the outer concrete. Attached Figure Description

[0024] Figure 1 This is a schematic elevation view of the top structure of the steel-concrete composite tower.

[0025] Figure 2 This is a plan view of the bottom steel plate of the steel box girder;

[0026] Figure 3 A schematic diagram of the PBL arrangement for the top stiffening ribs of the main steel pipe.

[0027] The markings in the diagram are: 1-Strengthened frame column, 2-Main steel pipe, 3-Bottom steel plate, 4-Top steel plate, 5-Longitudinal web, 6-Transverse web, 7-Web stiffening rib, 8-First anchor plate, 9-Second anchor plate, 10-First steel pipe stiffening rib, 11-Second steel pipe stiffening rib, 12-Third steel pipe stiffening rib, 13-Second through hole, 14-Fourth through hole, 15-Third through hole, 16-Second reinforcing bar, 17-Fourth reinforcing bar, 18-Third reinforcing bar, 19-Bridge tower reinforcing bar. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Example 1

[0031] like Figures 1 to 3 As shown, the top structure of a steel-concrete composite tower according to the present invention includes a stiffening frame column 1 and a steel box girder.

[0032] The rigid frame column 1 includes a four-limb steel tube concrete truss column and a concrete web between the columns. The steel tube concrete truss column includes a main steel tube 2, which is filled with concrete and wrapped with concrete.

[0033] like Figure 1 and Figure 2 As shown, the steel box girder includes a bottom steel plate 3 and a top steel plate 4. Several longitudinal web plates 5 and several transverse web plates 6 are connected between the top steel plate 4 and the bottom steel plate 3. The longitudinal web plates 5 are arranged along the bridge direction, and the transverse web plates 6 are arranged across the bridge direction. Several web plate stiffening ribs 7 are provided on the longitudinal web plates 5 and several web plate stiffening ribs 7 are provided on the transverse web plates 6. The top steel plate 4 is used for riveting and welding the connecting cable saddles. The steel box girder is formed by full penetration welding between the plates.

[0034] like Figure 1 As shown, the main steel pipe 2 is welded to the bottom of the bottom steel plate 3. Several first anchor plates 8 and several second anchor plates 9 are welded to the bottom of the bottom steel plate 3. The first anchor plates 8 are inserted into the main steel pipe 2, and the second anchor plates 9 are arranged along the bridge direction.

[0035] In one specific implementation, such as Figure 2As shown, the bottom steel plate 3 and the top steel plate 4 are each provided with two cavities, which are spaced apart along the bridge direction. A longitudinal web plate 5 is provided on each side of the cavity along the bridge direction, and a transverse web plate 6 is provided at each end of the cavity along the bridge direction. A transverse web plate 6 is provided between the two cavities. The web plate stiffening ribs 7 are symmetrically arranged on both sides of the longitudinal web plate 5 or on both sides of the transverse web plate 6. The first anchor plate 8 includes two sets of mutually perpendicular steel anchor plates arranged in a cross shape. A second anchor plate 9 is provided on each side of the cavity along the bridge direction.

[0036] like Figure 1 and Figure 3 As shown, the main steel pipe 2 is provided with several first steel pipe stiffening ribs 10 on its inner and outer sides respectively. The first steel pipe stiffening ribs 10 on the outer side are provided with several second through holes 13 and several third through holes 15, while the first steel pipe stiffening ribs 10 on the inner side are provided with only several second through holes 13. The main steel pipe 2 is provided with second steel pipe stiffening ribs 11 and third steel pipe stiffening ribs 12 on its outer side. The second steel pipe stiffening ribs 11 are arranged facing the adjacent main steel pipe 2. The second steel pipe stiffening ribs 11 and the third steel pipe stiffening ribs 12 are provided with several second through holes 13, several fourth through holes 14 and several third through holes 15 respectively. The tops of the first steel pipe stiffening ribs 10, the second steel pipe stiffening ribs 11 and the third steel pipe stiffening ribs 12 are respectively welded to the bottom steel plate 3.

[0037] In one specific implementation, such as Figure 1 and Figure 3 As shown, the first steel pipe stiffening rib 10, the second steel pipe stiffening rib 11, and the third steel pipe stiffening rib 12 on the outer side of the main steel pipe 2 are each provided with a row of second through holes 13. The first steel pipe stiffening rib 10 on the outer side of the main steel pipe 2 is also provided with a row of third through holes 15 close to the pipe wall. The third steel pipe stiffening rib 12 is also provided with a row of third through holes 15 close to the pipe wall of the main steel pipe 2. The third steel pipe stiffening rib 12 is also provided with a row of fourth through holes 14. The second steel pipe stiffening rib 11 is provided with a row of third through holes 15 and two rows of fourth through holes 14.

[0038] like Figure 1 and Figure 2 As shown, the bottom steel plate 3, the top steel plate 4, the longitudinal web 5, the transverse web 6, the web stiffening rib 7, the first anchor plate 8, and the second anchor plate 9 are each provided with a plurality of first through holes, and first reinforcing bars are inserted into the first through holes to form PBL shear keys.

[0039] like Figure 3As shown, the second reinforcing bar 16 is inserted into the second through hole 13 on the outer side of the main steel pipe 2 to form the PBL shear key. The second reinforcing bar 16 is a stirrup, which wraps around the outer perimeter of the main steel pipe 2. Due to the difficulty of construction on the inner side of the main steel pipe 2, no reinforcing bar is inserted into the second through hole 13 on the inner side of the main steel pipe 2. The third reinforcing bar 18 is inserted into the third through hole 15 to form the PBL shear key. The third reinforcing bar 18 is a tie bar, which wraps around the outer wall of the main steel pipe 2 and passes through the first steel pipe stiffening rib 10, the third steel pipe stiffening rib 12 and the second steel pipe stiffening rib 15 in sequence. The third through hole 15 on the tube stiffener 11 is connected to the bridge tower reinforcement 19, and the fourth reinforcement 17 is inserted through the fourth through hole 14 to form the PBL shear key. With this structure, by setting the first steel tube stiffener 10, the second steel tube stiffener 11 and the third steel tube stiffener 12 inside and outside the main steel tube 2, and forming the PBL shear key, the stiffness and local stability of the connection node are improved. The tie rod extends into the core concrete of the bridge tower to connect with the bridge tower reinforcement 19, ensuring that the stiffened skeleton column 1 is reliably connected to the steel box girder and the outer concrete.

[0040] like Figure 1 As shown, the top area of ​​the rigid frame column 1 and the steel box girder are encased in concrete. The encased concrete is connected to the steel structure through the PBL shear key. The encased concrete is poured in two stages. The first stage is poured to the area below the top of the main steel pipe 2. After the steel box girder and tower top grid are installed and the relevant accuracy requirements are met, the second stage is performed.

[0041] In this embodiment, the enormous pressure at the cable saddle is transmitted to the steel box girder and the outer concrete. The main steel pipe 2 is welded to the steel box girder, and the force on the steel box girder is evenly transmitted to the stiffening frame column 1 through the first anchor plate 8, the second anchor plate 9, the first steel pipe stiffening rib 10, the second steel pipe stiffening rib 11, the third steel pipe stiffening rib 12 and the outer concrete.

[0042] The top structure of the steel-concrete composite tower described in this embodiment connects the steel box girder, the main steel pipe 2, and the outer concrete casing into a whole through the PBL shear keys. This allows the enormous pressure at the cable saddle supported by the top structure to be transferred to the stiffening frame column 1, solving the problem of force transmission at the top of the tower of a long-span suspension or cable-stayed steel-concrete composite bridge. It achieves a fixed connection between the steel box girder and the stiffening frame column 1, and the coordinated work of the steel box girder, main steel pipe 2, and outer concrete casing, resulting in good structural integrity and clear force transmission at the nodes. By setting the first anchor plate 8 and its first through hole and perforated first reinforcing bar, the number of PBL shear keys is further increased. The PBL shear keys are inserted into the main steel pipe 2 along with the first anchor plate 8 and anchored in the core concrete of the main steel pipe 2, ensuring the stability of the connection between the main steel pipe 2 and the steel box girder. This top structure is simple, easy to operate, has a short construction period, and achieves good results.

[0043] Example 2

[0044] like Figures 1 to 3 As shown, the steel-concrete composite tower of the present invention includes at least two stiffened frame columns 1, adjacent stiffened frame columns 1 are connected by at least one crossbeam, and the top of the stiffened frame columns 1 is provided with the top structure of the steel-concrete composite tower as described in Embodiment 1.

[0045] Example 3

[0046] like Figures 1 to 3 As shown, the bridge of the present invention includes at least one steel-concrete composite tower as described in Example 2.

[0047] In one specific embodiment, when the bridge includes one of the steel-concrete composite towers, the bridge is a cable-stayed bridge.

[0048] In one specific embodiment, when the bridge includes two of the aforementioned steel-concrete composite towers, the bridge is a cable-stayed bridge or a suspension bridge.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A top structure for a steel-concrete composite tower, characterized in that, The structure includes a rigid frame column (1) and a steel box girder. The steel box girder includes a bottom steel plate (3) and a top steel plate (4). The main steel pipe (2) of the rigid frame column (1) is connected to the bottom of the bottom steel plate (3). Several longitudinal web plates (5) and several transverse web plates (6) are connected between the top steel plate (4) and the bottom steel plate (3). Several first through holes are provided on the bottom steel plate (3), the top steel plate (4), the longitudinal web plates (5) and the transverse web plates (6). First reinforcing bars are inserted into the first through holes to form PBL shear keys. The top area of ​​the rigid frame column (1) and the steel box girder are encased in concrete.

2. The top structure of the steel-concrete composite tower according to claim 1, characterized in that, The longitudinal web (5) is provided with several web stiffening ribs (7), the transverse web (6) is provided with several web stiffening ribs (7), the web stiffening ribs (7) are provided with several first through holes, and the first steel bars are inserted through the first through holes to form PBL shear keys.

3. The top structure of the steel-concrete composite tower according to claim 2, characterized in that, The bottom steel plate (3) and the top steel plate (4) are each provided with two holes. The holes are spaced apart along the bridge direction. A longitudinal web plate (5) is provided on each side of the hole along the bridge direction. A transverse web plate (6) is provided at each end of the hole along the bridge direction. A transverse web plate (6) is provided between the two holes. The web plate stiffening ribs (7) are symmetrically arranged on both sides of the longitudinal web plate (5) or symmetrically arranged on both sides of the transverse web plate (6).

4. The top structure of the steel-concrete composite tower according to claim 1, characterized in that, The bottom steel plate (3) is provided with several first anchor plates (8), which are inserted into the main steel pipe (2). Several first through holes are provided on the first anchor plates (8), and the first reinforcing bars are inserted into the first through holes to form PBL shear keys.

5. The top structure of the steel-concrete composite tower according to any one of claims 1-4, characterized in that, The main steel pipe (2) is provided with several first steel pipe stiffening ribs (10) on its inner and outer sides respectively. The first steel pipe stiffening ribs (10) on the outer side are provided with several second through holes (13) and several third through holes (15). The second through holes (13) are provided with second reinforcing bars (16) to form PBL shear keys. The third through holes (15) are provided with third reinforcing bars (18) to form PBL shear keys. The first steel pipe stiffening ribs (10) on the inner side are provided with several second through holes (13).

6. The top structure of the steel-concrete composite tower according to claim 5, characterized in that, The main steel pipe (2) is provided with a second steel pipe stiffening rib (11) and a third steel pipe stiffening rib (12) on the outside. The second steel pipe stiffening rib (11) is arranged facing the adjacent main steel pipe (2). The second steel pipe stiffening rib (11) and the third steel pipe stiffening rib (12) are respectively provided with a number of second through holes (13), a number of fourth through holes (14) and a number of third through holes (15). The second steel bar (16) is inserted in the second through hole (13) to form a PBL shear key. The fourth steel bar (17) is inserted in the fourth through hole (14) to form a PBL shear key. The third steel bar (18) is inserted in the third through hole (15) to form a PBL shear key.

7. The top structure of the steel-concrete composite tower according to claim 6, characterized in that, The third reinforcing bar (18) is a tie bar. The tie bar is wrapped around the outer wall of the main steel pipe (2) and passes through the third through hole (15) on the first steel pipe stiffening rib (10), the third steel pipe stiffening rib (12) and the second steel pipe stiffening rib (11) in sequence before being connected to the bridge tower reinforcing bar (19).

8. The top structure of the steel-concrete composite tower according to any one of claims 1-7, characterized in that, The outer concrete is poured in two stages. The first stage is poured up to the area below the top of the main steel pipe (2), and the second stage is poured after the steel box girder is installed.

9. A steel-concrete composite tower, characterized in that, It includes at least two rigid frame columns (1), adjacent rigid frame columns (1) are connected by at least one crossbeam, and the top of the rigid frame column (1) is provided with a top structure of the steel tube concrete composite tower as described in any one of claims 1-8.

10. A bridge, characterized in that, It includes at least one steel-concrete composite tower as described in claim 9.

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