A staged combined composite bridge tower structure

Abstract

The present application relates to a kind of phased combination combined bridge tower structure and construction method, it includes: concrete structure;Steel structure is arranged in the four around of the concrete structure, the steel structure is connected by temporary connecting piece or permanent connecting piece the concrete structure, so that the concrete structure is located in the central of the steel structure.Steel tower stress can be reduced, steel tower section can be reduced, steel consumption is reduced, engineering cost is reduced, and concrete tower is arranged in the central section, steel tower is arranged around section, the bending stiffness of the superimposed section formed by the two is the same as the combined section, the lateral bending capacity of each period bridge tower is unchanged, steel tower and concrete tower can be asynchronous construction, increase the work surface of bridge tower construction, can improve the construction speed of bridge tower, shorten construction period.

Description

Technical Field

[0001] This invention relates to the field of bridge tower structures, and in particular to a phased assembly of a combined bridge tower structure and its construction method. Background Technology

[0002] As the main load-bearing components of a cable-stayed bridge, the bridge towers bear the heavy loads transmitted from the cables, exhibiting eccentric compression characteristics. They can generally be constructed using concrete, steel, or steel-concrete composite structures. Concrete towers are inexpensive but heavy and have long construction periods; steel towers are lightweight, factory-manufactured, and assembled on-site, offering fast construction and guaranteed quality, but are more expensive. Steel-concrete composite towers are increasingly used because they fully utilize the advantages of both steel and concrete. In particular, the core concrete composite tower features a concrete structure in the center of the cross-section to withstand compression, while the steel structure is distributed around the perimeter to withstand bending moments. This effectively utilizes the material advantages of concrete under compression and steel under tension, resulting in higher material efficiency.

[0003] In related technologies, composite bridge towers are constructed by forming a whole within each segment before constructing the next segment, ensuring that the composite sections always bear loads together. Since the dead load of a long-span bridge structure accounts for over 80% of the total load, the bridge tower primarily bears its own dead load for most of the time. Under dead load conditions, the bridge tower is generally an axially compressed member subjected only to axial compression. This means that the steel structure portion of the composite section must bear a portion of the dead load axial force and the axial force and bending moment of the live load, resulting in a relatively large steel consumption and poor economic efficiency for composite bridge towers.

[0004] Therefore, it is necessary to propose a new composite tower structure for long-span cable-stayed bridge towers to solve the above problems. Summary of the Invention

[0005] This invention provides a phased assembly of a composite bridge tower structure and its construction method to solve the problem in related technologies where the steel structure portion of the composite section needs to bear a portion of the dead load axial force and the axial force and bending moment of the live load, resulting in a large amount of steel consumption and poor economic efficiency.

[0006] In a first aspect, a phased-assembly composite bridge tower structure is provided, comprising: a concrete structure; and a steel structure disposed around the concrete structure, wherein the steel structure is connected to the concrete structure via temporary or permanent connectors, such that the concrete structure is located at the center of the steel structure; during the construction phase of the composite bridge tower structure, the steel structure is connected to the concrete structure via the temporary connectors, which constrain the horizontal displacement of the steel structure and the concrete structure; during the operation phase of the composite bridge tower structure, the steel structure is connected to the concrete structure via the permanent connectors, which constrain the horizontal and vertical displacement of the steel structure and the concrete structure.

[0007] In some embodiments, the temporary connector comprises two symmetrical parts, which are respectively fixed to opposite sides of the steel structure, and a steel plate is fixed to the outside of the concrete structure, the steel plate being inserted between the two parts of the temporary connector.

[0008] In some embodiments, the temporary connector is abutted against the exterior of the concrete structure on the side closest to the concrete structure.

[0009] In some embodiments, there are multiple temporary connectors, which are symmetrically distributed around the perimeter of the concrete structure.

[0010] In some embodiments, multiple temporary connectors are provided along the length of the concrete structure, and each layer of temporary connectors is located in the same horizontal plane.

[0011] In some embodiments, the temporary connector is trapezoidal and its dimensions gradually decrease from the end closer to the concrete structure to the end farther away from the concrete structure.

[0012] In some embodiments, a steel plate is fixed to the outside of the concrete structure, the steel plate is connected to the steel structure, and the permanent connector is fixed at the connection between the steel plate and the steel structure.

[0013] In some embodiments, there are multiple permanent connectors, which are symmetrically distributed around the perimeter of the concrete structure.

[0014] In some embodiments, each of the permanent connectors extends along the length of the concrete structure.

[0015] Secondly, a construction method for a phased assembly of a composite bridge tower structure is provided, comprising the following steps: steel structures are arranged layer by layer around a concrete structure, with the concrete structure located in the center of the steel structure, and the steel structure and the concrete structure are connected by temporary connectors, which constrain the horizontal displacement of the steel structure and the concrete structure; after all the concrete structures and the steel structure are assembled, the temporary connectors are removed, and the steel structure and the concrete structure are connected by permanent connectors, which constrain the horizontal and vertical displacement of the steel structure and the concrete structure, thus forming the composite bridge tower structure.

[0016] The beneficial effects of the technical solution provided by this invention include:

[0017] This invention provides a phased combination bridge tower structure and construction method. During the construction phase, the horizontal displacement between the steel tower and the concrete tower is constrained only by temporary connectors, while vertical displacement is allowed between the steel tower and the core concrete. The two form a composite section, with the concrete tower bearing its own weight and the vertical force transmitted from the cables, and the steel tower bearing only its own weight. During the operation phase, the horizontal and vertical displacement between the steel tower and the concrete tower is constrained by permanent connectors, while vertical and horizontal displacement is not allowed between the steel tower and the core concrete. The two form a composite section, jointly bearing the vertical force and longitudinal and lateral bending moments generated by live loads and other variable loads. This reduces the stress on the steel tower, allows for a smaller steel tower cross-section, reduces steel consumption, and lowers project costs. Furthermore, the concrete tower is located in the center of the cross-section, while the steel tower is located around the perimeter. The composite section formed by the two has the same bending stiffness as the composite section, ensuring that the lateral bending capacity of the bridge tower remains unchanged at all stages. The steel tower and the concrete tower can be constructed asynchronously, increasing the working surface for bridge tower construction, improving construction speed, and shortening the construction period. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A radial cross-sectional view of the phased assembly of the combined bridge tower structure provided in this embodiment of the invention during the construction phase;

[0020] Figure 2 A radial cross-sectional view of the phased assembly of the combined bridge tower structure provided in this embodiment of the invention during the operation phase;

[0021] Figure 3An axial cross-sectional view of the phased assembly of the combined bridge tower structure provided in this embodiment of the invention during the construction phase;

[0022] Figure 4 An axial cross-sectional view of the phased assembly of the combined bridge tower structure provided in this embodiment of the invention during the operation phase.

[0023] Numbering on the map:

[0024] 1. Steel structure; 2. Concrete structure; 3. Temporary connectors; 4. Permanent connectors; 5. Steel plates. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides a phased assembly of a composite bridge tower structure and its construction method, which solves the problem in related technologies where the steel structure part of the composite section needs to bear a portion of the dead load axial force and the axial force and bending moment of the live load, resulting in a large amount of steel consumption and poor economic efficiency.

[0027] See Figures 1-4 As shown in the figure, a phased assembly composite bridge tower structure provided by an embodiment of the present invention may include: a concrete structure 2; and a steel structure 1 disposed around the concrete structure 2. The steel structure 1 is connected to the concrete structure 2 by temporary connectors 3 or permanent connectors 4, such that the concrete structure 2 is located in the center of the steel structure 1. During the construction phase of the composite bridge tower structure, the steel structure 1 is connected to the concrete structure 2 by the temporary connectors 3, which can constrain the horizontal displacement of the steel structure 1 and the concrete structure 2. During the operation phase of the composite bridge tower structure, the steel structure 1 is connected to the concrete structure 2 by the permanent connectors 4, which can constrain the horizontal and vertical displacement of the steel structure 1 and the concrete structure 2.

[0028] In this embodiment, during the construction phase, the steel structure 1 and the concrete structure 2 are only constrained by temporary connectors 3 for horizontal displacement, while vertical displacement is allowed between them. They form a composite section, with the concrete structure 2 bearing its own weight and the vertical force transmitted from the cables, and the steel structure 1 bearing only its own weight. During the operation phase, the steel structure 1 and the concrete structure 2 are constrained by permanent connectors 4 for both horizontal and vertical displacement, and no vertical or horizontal displacement is allowed between them. They form a combined section, jointly bearing the vertical force and longitudinal and transverse bending moments generated by live loads and other variable loads. This reduces the stress on the steel structure 1, allows for a smaller cross-section of the steel structure 1, reduces steel consumption, and lowers the project cost. Furthermore, the concrete structure 2 is located at the center of the composite bridge tower's cross-section, while the steel structure 1 is located around the perimeter of the composite bridge tower's cross-section. The composite section formed by the two has the same bending stiffness as the combined section, ensuring that the lateral bending capacity of the bridge tower remains unchanged at all stages. The steel structure 1 and the concrete structure 2 can be constructed asynchronously, increasing the working surface for bridge tower construction, improving construction speed, and shortening the construction period.

[0029] See Figure 1 As shown, in some embodiments, the temporary connector 3 may include two symmetrical parts, which are respectively fixed to opposite sides of the steel structure 1. A steel plate 5 is fixed to the outside of the concrete structure 2. The steel plate 5 is inserted between the two parts of the temporary connector 3. In this embodiment, the concrete structure 2 has a square cross-section, and a steel plate 5 is fixed to each of its four outer sides. The steel plate 5 is connected to the steel structure 1. The temporary connector 3 has two spaced-apart parts. The steel plate 5 and the steel structure 1 are both located between the two parts. The two parts of the temporary connector 3 can be fixed to opposite sides of the steel structure 1 or to opposite sides of the steel plate 5, thereby constraining the relative displacement of the steel structure 1 and the concrete structure 2 in the horizontal direction. However, vertical displacement is allowed between the steel structure 1 and the concrete structure 2. Therefore, the concrete structure 2 bears its own weight and the vertical force transmitted by the cable, while the steel structure 1 only bears its own weight, thereby reducing the cross-section of the steel structure 1 and reducing the amount of steel used.

[0030] See Figure 1 As shown, in some embodiments, the temporary connector 3 abuts against the outside of the concrete structure 2 on the side closest to the concrete structure 2. In this embodiment, the end face of the temporary connector 3 abuts against the outside of the concrete structure 2, and each of the opposite sides of the concrete structure 2 abuts against a temporary connector 3, thereby forming a constraint force in the opposite direction on the concrete structure 2, which can better constrain the concrete structure 2 in the horizontal direction.

[0031] See Figure 1As shown, in some embodiments, there are multiple temporary connectors 3, which are symmetrically distributed around the concrete structure 2. In this embodiment, by symmetrically distributing multiple temporary connectors 3 around the concrete structure 2, constraints can be formed on the concrete structure 2 in various relative directions, making the entire bridge tower structure more stable.

[0032] See Figure 3 As shown, in some embodiments, multiple temporary connectors 3 are provided along the length of the concrete structure 2 in multiple layers, and each layer of temporary connectors 3 is located in the same horizontal plane. In this embodiment, by providing multiple layers of temporary connectors 3, the concrete structure 2 and the steel structure 1 can be constrained in all directions along the length, which is more effective.

[0033] See Figure 1 As shown, in some embodiments, the temporary connector 3 is trapezoidal, and its size gradually decreases from the end closer to the concrete structure 2 to the end farther away from the concrete structure 2. In this embodiment, the size of the temporary connector 3 at the end closer to the concrete structure 2 is larger than the size at the end farther away from the concrete structure 2, so that the contact area between the temporary connector 3 and the concrete structure 2 is larger, which can better constrain the concrete structure 2.

[0034] See Figure 2 As shown, in some embodiments, a steel plate 5 is fixed to the outside of the concrete structure 2, the steel plate 5 is connected to the steel structure 1, and the permanent connector 4 is fixed at the connection between the steel plate 5 and the steel structure 1. In this embodiment, by connecting the steel plate 5 to the steel structure 1, the side of the permanent connector 4 can be in full contact with the steel plate 5 and the steel structure 1, minimizing the space at the connection between the steel plate 5 and the steel structure 1, and preventing relative movement between the steel plate 5 and the steel structure 1 in the horizontal direction.

[0035] See Figure 2 As shown, in some embodiments, there are multiple permanent connectors 4, which are symmetrically distributed around the concrete structure 2. In this embodiment, by symmetrically distributing multiple permanent connectors 4 around the concrete structure 2, constraints can be formed on the concrete structure 2 in various relative directions, making the entire bridge tower structure more stable.

[0036] See Figure 4 As shown, in some embodiments, each of the permanent connectors 4 extends along the length of the concrete structure 2. In this embodiment, by extending the permanent connectors 4 along the length of the concrete structure 2, the vertical and horizontal movement of the concrete structure 2 and the steel structure 1 can be constrained in all aspects along the length direction, resulting in better performance.

[0037] See Figures 1-4 As shown, this invention provides a construction method for a phased assembly of a combined bridge tower structure, which may include the following steps: Arranging steel structures 1 layer by layer around a concrete structure 2, with the concrete structure 2 located in the center of the steel structure 1, and connecting the steel structure 1 and the concrete structure 2 with temporary connectors 3, which constrain the horizontal displacement of the steel structure 1 and the concrete structure 2; after all the concrete structures 2 and the steel structure 1 are erected, removing the temporary connectors 3, and connecting the steel structure 1 and the concrete structure 2 with permanent connectors 4. Structure 2, with the permanent connector 4 constraining the horizontal and vertical displacements of the steel structure 1 and the concrete structure 2, forms a composite bridge tower structure. This reduces the stress on the steel structure 1, allows for a smaller cross-section of the steel structure 1, reduces steel consumption, and lowers project costs. Furthermore, the concrete structure 2 is positioned at the center of the composite bridge tower's cross-section, while the steel structure 1 is positioned around the perimeter. The resulting superimposed cross-section has the same bending stiffness as the composite cross-section, ensuring that the lateral bending capacity of the bridge tower remains constant throughout the construction process. The steel structure 1 and the concrete structure 2 can be constructed asynchronously, increasing the working surface for bridge tower construction, improving construction speed, and shortening the construction period.

[0038] Example: Taking a 200m high main tower as an example, the tower base dimensions of conventional combined towers and staged combined towers are shown in Table 1, and the stress of each component under various load conditions is shown in Table 2.

[0039] Table 1:

[0040]

[0041] Table 2:

[0042]

[0043] As shown in Tables 1 and 2, under the same load, to ensure that the bending stiffness of the main tower does not decrease and the core concrete stress remains the same, the core concrete size of the staged composite tower increases from 5×5m to 6.45×6.45m, while the equivalent wall thickness of the outer steel structure decreases from 0.043m to 0.027m. At this point, the maximum stress of the steel structure is only 104MPa, a reduction of 47%. Based on material usage calculations, the total cost of the staged composite tower can be reduced by approximately 8.9%.

[0044] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0045] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A phased assembly of a combined bridge tower structure, characterized in that, It includes: Concrete structure (2); A steel structure (1) is arranged around the concrete structure (2), and the steel structure (1) is connected to the concrete structure (2) by temporary connectors (3) or permanent connectors (4), so that the concrete structure (2) is located in the center of the steel structure (1). During the construction phase of the combined bridge tower structure, the steel structure (1) is connected to the concrete structure (2) through the temporary connector (3), and the temporary connector (3) can constrain the horizontal displacement of the steel structure (1) and the concrete structure (2). When the combined bridge tower structure is in operation, the steel structure (1) is connected to the concrete structure (2) through the permanent connector (4), and the permanent connector (4) can constrain the horizontal and vertical displacements of the steel structure (1) and the concrete structure (2); The construction steps for the phased assembly of the combined bridge tower structure include: The steel structure (1) is arranged layer by layer around the concrete structure (2), so that the concrete structure (2) is located in the center of the steel structure (1), and the steel structure (1) and the concrete structure (2) are connected by temporary connectors (3), so that the temporary connectors (3) constrain the horizontal displacement of the steel structure (1) and the concrete structure (2). After all the concrete structures (2) and the steel structures (1) are erected, the temporary connectors (3) are removed, and the steel structures (1) and the concrete structures (2) are connected by permanent connectors (4), so that the permanent connectors (4) constrain the horizontal and vertical displacements of the steel structures (1) and the concrete structures (2) to form a combined bridge tower structure.

2. The phased assembly of the combined bridge tower structure as described in claim 1, characterized in that: The temporary connector (3) comprises two symmetrical parts, which are respectively fixed to the opposite sides of the steel structure (1). A steel plate (5) is fixed to the outside of the concrete structure (2), and the steel plate (5) is inserted between the two parts of the temporary connector (3).

3. The phased assembly of the combined bridge tower structure as described in claim 2, characterized in that: The temporary connector (3) abuts against the outside of the concrete structure (2) on the side closest to the concrete structure (2).

4. The phased assembly of the combined bridge tower structure as described in claim 3, characterized in that: The temporary connectors (3) are multiple, and the multiple temporary connectors (3) are symmetrically distributed around the concrete structure (2).

5. The phased assembly of the combined bridge tower structure as described in claim 3, characterized in that: Multiple temporary connectors (3) are provided in multiple layers along the length of the concrete structure (2), and each layer of temporary connectors (3) is located in the same horizontal plane.

6. The phased assembly of the combined bridge tower structure as described in claim 3, characterized in that: The temporary connector (3) is trapezoidal, and its size gradually decreases from the end closer to the concrete structure (2) to the end farther away from the concrete structure (2).

7. The phased assembly of the combined bridge tower structure as described in claim 1, characterized in that: A steel plate (5) is fixed to the outside of the concrete structure (2), the steel plate (5) is connected to the steel structure (1), and the permanent connector (4) is fixed at the connection between the steel plate (5) and the steel structure (1).

8. The phased assembly of the combined bridge tower structure as described in claim 7, characterized in that: The permanent connector (4) is multiple and the multiple permanent connectors (4) are symmetrically distributed around the concrete structure (2).

9. The phased assembly of the combined bridge tower structure as described in claim 1, characterized in that: Each of the permanent connectors (4) extends along the length of the concrete structure (2).

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