Steel shell concrete composite bridge tower beam fixing structure

Abstract

The application relates to the technical field of bridge structure construction, and discloses a kind of steel shell concrete combination bridge tower beam fixed structure construction, bridge tower steel shell, including the bridge tower steel shell outer wall plate and bridge tower steel shell inner wall plate extending along the height direction of bridge tower, the center of bridge tower steel shell inner wall plate is equipped with manhole passage vertical wall plate, the manhole passage vertical wall plate and the bridge tower steel shell outer wall plate are filled with bridge tower filling core concrete through connecting piece; steel girder is connected to the two sides of bridge tower steel shell outer wall plate, the inner side of bridge tower steel shell outer wall plate is provided with the corresponding counter steel shell partition plate of steel girder top plate and bottom plate; steel girder stiffened beam is arranged below the steel girder at the junction position of bridge tower steel shell and steel girder; while reducing the temperature and secondary deformation of concrete, the core constraint can also be provided for the concrete, the compressive strength of bridge tower concrete is greatly improved, the risk of concrete cracking is reduced, and the safety of the structure is improved.

Description

Technical Field

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

[0002] Currently, most long-span cable-stayed bridges with a fixed tower-beam structure use concrete towers, while the main beams are often made of steel to reduce weight. Since these two materials cannot be directly welded, a steel-concrete composite section or prestressed steel strands are required for connection. This conventional tower-beam connection method has the following drawbacks:

[0003] (1) The steel main beam and the concrete bridge tower cannot be directly fixed. When forcibly fixed, a large number of prestressed steel strands need to be tensioned. The prestressing tensioning needs to be carried out in batches after the concrete reaches 7 days of age and meets the strength requirements. This requires a large number of tensioning equipment, consumes human resources, and increases time costs.

[0004] (2) When the external temperature changes suddenly, the steel main beam is more likely to have a large longitudinal displacement due to its large coefficient of linear expansion. Since the tower and beam are fixed, the bridge tower at the fixed position cannot freely expand and contract. The unbalanced temperature secondary bending moment generated by the steel main beam is borne entirely by the concrete bridge tower. The concrete of the bridge tower bends, and temperature cracks are likely to appear in the concrete of the bridge tower at the fixed position.

[0005] (3) Due to the large amount of concrete poured at the fixed position of the bridge tower, the concrete shrinks and creeps, resulting in large shrinkage and creep secondary stress. The large creep secondary stress will cause the stress of the vertical steel bars of the bridge tower to increase, thereby further increasing the cracks in the bridge tower. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a steel-concrete composite bridge tower beam-tower solid structure, which can reduce concrete temperature and creep deformation, while also providing core confinement to the concrete, greatly improving the compressive strength of the bridge tower concrete, reducing the risk of concrete cracking, and improving the safety of the structure.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] A steel-concrete composite bridge tower beam-tower structural system includes:

[0009] The steel shell of the bridge tower includes an outer wall panel and an inner wall panel extending along the height of the bridge tower. A vertical wall panel for a manhole passage is provided at the center of the inner wall panel. The manhole passage vertical wall panel and the outer wall panel of the bridge tower are filled with bridge tower core-filling concrete through connectors.

[0010] The main steel beam is connected to both sides of the outer wall panel of the bridge tower steel shell. The inner side of the outer wall panel of the bridge tower steel shell is provided with a top steel shell partition corresponding to the top plate and bottom plate of the main steel beam.

[0011] The steel main girder stiffening girder is located below the steel main girder at the junction of the bridge tower steel shell and the steel main girder.

[0012] As a further implementation, the top steel shell partition is perpendicular to the axial direction of the bridge tower steel shell, including an upper steel shell partition and a lower steel shell partition, and a steel main beam stiffening beam partition is provided on the inner side of the outer wall panel of the bridge tower steel shell near the bottom.

[0013] As a further implementation, the bottom plate of the steel main beam and the lower partition plate of the steel shell are located in the same plane, and the angle between the plane of the top plate of the steel main beam and the plane of the upper partition plate of the steel shell is the cross slope of the steel main beam.

[0014] As a further implementation, a number of compartment partitions are provided circumferentially between the outer wall panel and the inner wall panel of the bridge tower steel shell, and the length of the compartment partitions is the same as the distance between the upper partition and the lower partition of the steel shell.

[0015] As a further implementation, the vertical wall panel of the manhole passage extends through the axial direction of the bridge tower steel shell at both ends, and the outer side of the vertical wall panel of the manhole passage is connected to the compartment partition. The transverse partition of the steel main beam is welded to the outer wall panel of the bridge tower steel shell.

[0016] As a further implementation, the top of the steel main girder stiffening beam is a steel main girder bottom plate, and the steel main girder stiffening beam includes an inclined bottom plate welded to the outer wall plate of the bridge tower steel shell, and the top diaphragm of the steel main girder stiffening beam and the bottom end of the inclined bottom plate are at the same height.

[0017] As a further implementation, the top steel shell partition is provided with shear studs on the side that contacts the bridge tower filling concrete, and the top steel shell partition is provided with reserved holes for pouring concrete.

[0018] As a further implementation, the reserved holes for pouring concrete are located between the compartment partitions.

[0019] As a further implementation, shear keys are provided on the outer wall panel and the inner wall panel of the bridge tower steel shell, and perforated steel bars and shear studs are provided laterally.

[0020] As a further implementation, shear studs are provided on the outer side of the vertical wall panel of the manhole passage.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. This invention enhances the rigidity and reliability of the tower-beam connection through the structural arrangement of the steel tower shell, steel main beam, and steel main beam stiffening beam. Furthermore, the presence of the steel tower shell reduces concrete temperature and creep deformation while providing core confinement, significantly improving the compressive strength of the tower concrete, reducing the risk of concrete cracking, and enhancing structural safety. The steel tower shell not only participates in structural stress but also serves as a formwork during core concrete pouring, reducing the risk of falling objects from heights during construction, saving construction time, and effectively improving the structural stress rationality, economy, and safety throughout its entire life cycle.

[0023] 2. The present invention provides pre-reserved holes for pouring concrete on the top steel shell partition plate, and uses compartment partition plates to divide the bridge tower steel shell and manhole passage into several pouring compartments to ensure that the concrete is poured densely without gaps. At the same time, the concrete, shear studs, perforated steel bars and other structures work together to effectively improve the bonding strength between the bridge tower steel shell and the concrete. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 A schematic diagram of the overall structure of the steel-concrete composite bridge tower beam-solid structure provided by the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the AA section structure;

[0027] Figure 3 for Figure 1 Schematic diagram of the BB section structure;

[0028] Figure 4 for Figure 1 Schematic diagram of the CC section structure;

[0029] Figure 5 for Figure 2 Schematic diagram of the DD section structure;

[0030] Figure 6 for Figure 2 Schematic diagram of the EE cross-section structure.

[0031] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0032] The components include: 1. Steel main beam; 2. Steel main beam stiffening beam; 3. Outer wall panel of bridge tower steel shell; 4. Inner wall panel of bridge tower steel shell; 5. Vertical wall panel of manhole passage; 6. Bridge tower core filling concrete; 7. Top-mounted steel shell partition plate; 8. Top-mounted partition plate of steel main beam stiffening beam; 9. Shear studs; 21. Horizontal partition plate of steel main beam; 22. Compartment partition plate; 23. Manhole passage; 31. Perforated reinforcing bars; 32. Pre-reserved holes for pouring concrete. Detailed Implementation

[0033] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] Given the problems with conventional tower-beam consolidation methods in the background art, there is an urgent need to propose a new tower-beam consolidation structure to solve the problem of concrete cracking at the consolidation location caused by secondary temperature stress and creep stress of the bridge tower during tower-beam consolidation.

[0035] Example 1

[0036] In a typical embodiment of the present invention, reference is made to Figures 1-6 As shown, a steel-concrete composite bridge tower beam-tower rigid structure includes a bridge tower steel shell, a steel main beam 1 connected to the bridge tower steel shell, and a steel main beam stiffening beam 2 located between the bottom plate of the steel main beam 1 and the bridge tower steel shell.

[0037] like Figure 1 and Figure 3 As shown, the steel shell of the bridge tower extends along the height of the bridge tower and is fixed to the main steel beam 1 at the junction of the bridge tower and the main steel beam 1. The steel shell of the bridge tower is rectangular in shape and includes an outer wall panel 3 and an inner wall panel 4 of the same shape. Vertical stiffening ribs along the height of the bridge tower are provided on both the outer and inner wall panels. The outer wall panel 3 is located outside the inner wall panel 4, and the space between them is used to fill concrete (bridge tower core-filling concrete 6).

[0038] The inner wall panel 4 (inner side) of the bridge tower steel shell is provided with a vertical wall panel 5 for a manhole passage, forming a manhole passage 23; and the outer side of the vertical wall panel 5 for the manhole passage and the inner wall panel 4 of the bridge tower steel shell are also provided with bridge tower filling concrete 6.

[0039] like Figure 1 As shown, the main steel beam 1 is connected to both sides of the outer wall panel 3 of the bridge tower steel shell. It includes a top plate, a bottom plate, and stiffening ribs. The main steel beam 1 and the bridge tower steel shell share the outer wall panel 3 of the bridge tower steel shell, that is, the top plate and bottom plate of the main steel beam 1 are welded to the outside of the outer wall panel 3 of the bridge tower steel shell.

[0040] like Figure 1 He Ru Figure 5As shown, the steel main girder stiffening beam 2 is located below the steel main girder at the junction of the bridge tower steel shell and the steel main girder, supporting the steel main girder 1 and strengthening the connection between the steel main girder 1 and the bridge tower steel shell. The steel main girder 1 and the stiffening beam 2 share the same outer wall panel as the bridge tower steel shell.

[0041] The stiffening beam 2 of the main steel girder shares the bottom plate of the main steel girder 1 with the main steel girder 1 as the top plate of the stiffening beam 2. The stiffening beam 2 has a vertical web plate and an inclined bottom plate. The vertical web plate connects to the inclined bottom plate, and the two are connected by a rib. The stiffening beam 2 of the main steel girder shares the outer wall plate 3 of the bridge tower steel shell with the bridge tower steel shell, that is, the bottom end of the inclined bottom plate is welded to the outer side of the outer wall plate of the bridge tower steel shell. In this embodiment, the bridge tower steel shell is fused and welded to the main steel girder 1 and the stiffening beam 2 through the outer wall plate.

[0042] like Figure 1 , Figure 5 and Figure 6 As shown, the inner side of the outer wall panel 3 of the bridge tower's steel shell is welded with opposing steel shell partition plates 7, corresponding to the top and bottom plates of the main steel beam 1. The surface of the opposing steel shell partition plates 7 is perpendicular to the axial direction of the bridge tower's steel shell and is used to transfer the lateral shear force exerted on the bridge tower by the main steel beam 1. These partition plates include an upper opposing steel shell partition and a lower opposing steel shell partition. The bottom plate of the main steel beam 1 and the lower opposing steel shell partition are located in the same plane, and the angle between the plane containing the top plate of the main steel beam 1 and the plane containing the upper opposing steel shell partition is the transverse slope of the main steel beam. The tops of both the outer and inner wall panels of the bridge tower's steel shell are welded to the upper opposing steel shell partition.

[0043] The inner side of the outer wall panel of the bridge tower's steel shell, near the bottom, is welded with a steel main beam stiffening beam and a top diaphragm 8, such as... Figure 5 As shown, the top diaphragm 8 of the steel main girder stiffening beam is at the same height as the bottom end of the inclined bottom plate.

[0044] like Figures 1-4 As shown, several compartment partitions 22 are provided circumferentially between the outer wall panel and the inner wall panel of the bridge tower steel shell, and the compartment partitions 22 are arranged along the height direction of the steel shell. Figure 2 and Figure 3 Taking the perspective as an example, the compartment partition 22 is composed of two thin-walled steel plates, one above and one below, and six thin-walled steel plates on the left, middle, and right. The surface of the compartment partition 22 is parallel to the axial direction of the steel shell bridge tower, and the length of the eight thin-walled steel plates is the vertical distance between the two top-mounted steel shell partitions 7.

[0045] The vertical wall panel 5 of the manhole passage has a rectangular cross-section, and its four outer sides are connected to four compartment partitions 22. Both ends of the vertical wall panel 5 penetrate the axial direction of the bridge tower's steel shell. (For example...) Figure 2 As shown, the steel main beam transverse diaphragm 21 is welded to the outer wall plate 3 of the bridge tower steel shell and is located on the centerline of the width direction of the bridge tower steel shell.

[0046] like Figure 3As shown, one end of each of the four compartment partitions 22 is welded to the inner side of the outer wall panel 3 of the bridge tower steel shell, and the other end passes through the inner wall panel 4 of the bridge tower steel shell and is welded to the vertical wall panel 5 of the manhole passage. The other four compartment partitions 22 are welded between the outer wall panel 3 and the inner wall panel 4 of the bridge tower steel shell.

[0047] The partition 22 divides the space between the outer wall panel 3 and the inner wall panel 4 of the bridge tower steel shell into eight casting chambers. The four partition 22 connected to the vertical wall panel 5 of the manhole passage, the inner wall panel 4 of the bridge tower steel shell, and the vertical wall panel 5 of the manhole passage form four casting chambers.

[0048] like Figure 2 and Figure 4 As shown, pre-cast concrete holes 32 are provided on the top steel shell partitions. Specifically, pre-cast concrete holes 32 are provided on both the upper and lower steel shell partitions. The upper and lower steel shell partitions, as well as the stiffening beam partition 8 of the main steel girder, are located between the outer wall panel 3 of the bridge tower steel shell and the vertical wall panel 5 of the manhole passage. The pre-cast concrete holes 32 are located between the compartment partitions 22; therefore, twelve pre-cast concrete holes 32 are correspondingly provided on the upper and lower steel shell partitions.

[0049] By setting the pre-reserved holes 32 for pouring concrete, the bridge tower filling concrete 6 can be filled between the outer wall panel 3 and the inner wall panel 4 of the bridge tower steel shell, between the inner wall panel 4 of the bridge tower steel shell and the vertical wall panel 5 of the manhole passage, and between the top partition of the steel shell and the top partition of the steel main beam stiffening beam 8.

[0050] To improve the connection strength between the concrete and the steel shell of the bridge tower, such as Figure 3 and Figure 4 As shown, PBL shear keys are installed on the inner and outer wall panels of the steel shell bridge tower, and perforated steel bars 31 are arranged laterally through shear studs 9. Shear studs 9 are also installed on the contact side between the inner and outer wall panels and the filling concrete. The filling concrete forms an integral force-bearing structure with the inner and outer wall panels through the PBL shear keys, shear studs, and perforated steel bars. Shear studs are installed on the side of the top steel shell diaphragm that contacts the filling concrete of the bridge tower, and the shear studs are combined with the filling concrete.

[0051] Shear studs are also installed on the outer side of the vertical wall panel of the manhole passage and on the compartment partition to improve the bonding strength between the bridge tower core concrete 6 and the bridge tower steel shell; no vertical stiffening ribs are installed on the vertical wall panel of the manhole passage.

[0052] In another example, a composite bridge tower bridge with tower-beam fixed structure is provided, which includes the above-described composite bridge tower-beam fixed structure.

[0053] Compared with existing technologies, this embodiment features a composite bridge tower formed by encasing the concrete of the bridge tower columns in a steel shell and incorporating shear keys and horizontal and vertical reinforcing bars within the shell. On one hand, the main steel beam and the steel shell can be directly welded together, achieving direct tower-beam consolidation, improving construction efficiency, and accelerating project progress. On the other hand, the steel shell deforms in tandem with the main steel beam, reducing bending deformation and temperature cracks caused by temperature changes. Furthermore, the steel shell provides core constraint to the concrete of the bridge tower columns, further reducing the risk of tower cracking.

[0054] This embodiment enhances the rigidity and reliability of the tower-beam connection through the structural arrangement of the steel tower shell, steel main beam, and steel main beam stiffening beam. Furthermore, the presence of the steel tower shell reduces concrete temperature and creep deformation while providing core confinement, significantly improving the compressive strength of the tower concrete, reducing the risk of concrete cracking, and enhancing structural safety. The steel tower shell not only participates in structural stress but also serves as a formwork during core concrete pouring, reducing the risk of falling objects from heights during construction, saving construction time, and effectively improving the structural stress rationality, economy, and safety throughout its entire life cycle.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A steel encased concrete composite bridge tower pylon structure, characterized in that, include: The bridge tower steel shell includes an outer wall panel and an inner wall panel extending along the height of the bridge tower. The outer wall panel is located outside the inner wall panel, and the space between them is used to fill the bridge tower with core-filling concrete. Several compartment partitions are arranged circumferentially between the outer wall panel and the inner wall panel. The length of the compartment partitions is the same as the distance between the upper and lower partitions of the steel shell. A vertical wall panel for a manhole passage is provided at the center of the inner wall panel. The manhole passage vertical wall panel and the outer wall panel are filled with bridge tower core-filling concrete through connectors. Bridge tower core-filling concrete is also provided between the outer side of the manhole passage vertical wall panel and the inner wall panel. The two ends of the manhole passage vertical wall panel penetrate the axial direction of the bridge tower steel shell. The outer side of the manhole passage vertical wall panel is connected to the compartment partitions. The steel main beam transverse diaphragm is welded to the outer wall panel of the bridge tower steel shell. A steel main girder connects to both sides of the outer wall panel of the bridge tower's steel shell. The bottom plate of the steel main girder and the lower top partition of the steel shell are located in the same plane. The angle between the plane of the top plate of the steel main girder and the plane of the upper top partition of the steel shell is the transverse slope of the steel main girder. A top-mounted steel shell partition corresponding to the top plate and bottom plate of the steel main girder is provided on the inner side of the outer wall panel of the bridge tower's steel shell. The plate surface of the top-mounted steel shell partition is perpendicular to the axial direction of the bridge tower's steel shell and includes an upper top partition and a lower top partition. A steel main girder stiffening beam top partition is provided on the inner side of the outer wall panel of the bridge tower's steel shell near the bottom. A steel main girder stiffening beam is located below the steel main girder at the junction of the bridge tower steel shell and the steel main girder. The top of the steel main girder stiffening beam is the bottom plate of the steel main girder. The steel main girder stiffening beam includes an inclined bottom plate welded to the outer wall plate of the bridge tower steel shell. The top diaphragm of the steel main girder stiffening beam and the bottom end of the inclined bottom plate are at the same height.

2. A steel-concrete composite bridge tower and girder fixed structure according to claim 1, characterized in that, The top steel shell partition is provided with shear studs on the side that contacts the bridge tower filling concrete, and the top steel shell partition is provided with reserved holes for pouring concrete.

3. A steel-concrete composite bridge tower and girder fixed structure according to claim 2, characterized in that, The pre-reserved holes for pouring concrete are located between the compartment partitions.

4. The steel-concrete composite bridge tower and beam structure of claim 1, wherein Shear keys are provided on the outer wall panel and the inner wall panel of the bridge tower steel shell, and perforated steel bars and shear studs are provided laterally.

5. A steel-concrete composite bridge tower and girder fixed structure according to claim 1, characterized in that, Shear studs are installed on the outer side of the vertical wall panel of the manhole passage.

Images