Tower top saddle stiffening section structure of circular steel bridge tower of suspension bridge

Abstract

The utility model discloses a tower top saddle stiffening section structure of a circular steel bridge tower of a suspension bridge. The tower top saddle stiffening section structure comprises a pre-installation structure located below a main cable saddle and a post-installation structure located above the main cable saddle. The first-mounted structure comprises a first-mounted structure top plate, a first-mounted structure secondary top plate, a first-mounted structure secondary bottom plate and a first-mounted structure bottom plate which are sequentially arranged from top to bottom, and a top plate rib and a longitudinal partition plate are arranged between the first-mounted structure top plate and the first-mounted structure secondary top plate; nine transverse partition plates are arranged between the first-mounted structure top plate and the first-mounted structure bottom plate, and a four-web structure is adopted between the first-mounted structure secondary top plate and the first-mounted structure bottom plate; the after-loading structure comprises an after-loading structure top plate and a frame partition plate. The technical problem faced by the structural design of the tower top saddle stiffening section of the circular steel bridge tower of the suspension bridge is broken through, a technical gap when the circular bridge tower is applied to a large-span suspension bridge is filled, the stress performance is guaranteed, the functional requirements are met, meanwhile, the overall rounded shape of the circular bridge tower is guaranteed, and the structural design of the tower top saddle stiffening section of the circular steel bridge tower of the suspension bridge is simplified. Good popularization and application prospects are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bridge engineering especially relates to a suspension bridge circular steel bridge tower top saddle stiffening section structure. BACKGROUND

[0002] The city bridge landscape demand is increasingly prominent, and the bridge tower is the important embodiment of the bridge landscape element, and the circular bridge tower landscape is strong, and often becomes the city landmark building, and shows good development prospect.

[0003] The bridge tower is the basic load-bearing component and important component of the cable-stayed bridge and suspension bridge, and is also the important embodiment of the bridge landscape element.

[0004] The circular bridge tower is generally more adopted steel structure due to the complex structure configuration and stress, and the currently built circular bridge tower is mostly cable-stayed bridge, and the only one circular bridge tower suspension bridge adopts the mode that the main cable is disconnected and directly anchored to the bridge tower, but the mode is only suitable for small-span suspension bridge. The utility model discloses a suspension bridge circular steel bridge tower top saddle stiffening section structure, which breaks through the technical problem faced by the design of the suspension bridge circular steel bridge tower top saddle stiffening section structure, fills in the technical blank of the circular bridge tower applied to the large-span suspension bridge, guarantees the stress performance and functional requirement, guarantees the overall round modeling of the circular bridge tower, can create more outstanding landscape effect, and has good popularization and application prospect.

[0005] In order to overcome the deficiency of prior art, the utility model solves the technical problem to provide a suspension bridge circular steel bridge tower top saddle stiffening section structure, breaks through the technical problem faced by the design of the suspension bridge circular steel bridge tower top saddle stiffening section structure, fills in the technical blank of the circular bridge tower applied to the large-span suspension bridge, guarantees the stress performance and functional requirement, guarantees the overall round modeling of the circular bridge tower, can create more outstanding landscape effect, and has good popularization and application prospect.

[0006] To achieve the above objectives, this utility model provides a stiffening section structure for the saddle seat at the top of a circular steel bridge tower of a suspension bridge, including a pre-installed structure located below the main cable saddle and a post-installed structure located above the main cable saddle; the pre-installed structure includes a pre-installed structure top plate, a pre-installed structure secondary top plate, a pre-installed structure secondary bottom plate, and a pre-installed structure bottom plate arranged sequentially from top to bottom, with top plate ribs and longitudinal diaphragms provided between the pre-installed structure top plate and the pre-installed structure secondary top plate; nine transverse diaphragms are provided between the pre-installed structure top plate and the pre-installed structure bottom plate, and a four-web plate structure is adopted between the pre-installed structure secondary top plate and the pre-installed structure bottom plate; the post-installed structure includes a post-installed structure top plate and frame diaphragms located around the main cable saddle.

[0007] Specifically, the four-web structure includes two vertical inner webs aligned with the main cable saddle body in the transverse direction, and two outer webs with an arc and tangent shape.

[0008] Specifically, the outer web is composed of an arc segment and straight segments located at both ends of the arc segment, and the arc segment and the straight segments are tangent at the point of tangency of the outer web.

[0009] Furthermore, the nine transverse diaphragms are in three forms: solid diaphragms, frame diaphragms, and half-diaphragms.

[0010] Furthermore, the 1st, 3rd, 5th, 7th, and 9th transverse diaphragms are half-diaphragms arranged at intervals, with the 5th transverse diaphragm located in the middle position; the 4th and 6th transverse diaphragms are solid-web diaphragms and are located between the 3rd and 5th transverse diaphragms, and between the 5th and 7th transverse diaphragms, respectively; the 2nd and 8th transverse diaphragms are frame diaphragms and are located between the 1st and 3rd transverse diaphragms, and between the 7th and 9th transverse diaphragms, respectively.

[0011] Furthermore, the top plate rib transitions into a longitudinal diaphragm in the saddle area, and together with the transverse diaphragm of the pre-installed structure, forms a steel grating between the top plate of the pre-installed structure and the secondary top plate of the pre-installed structure.

[0012] Furthermore, the top plate of the pre-installed structure and the secondary top plate of the pre-installed structure are horizontally arranged so that the bottom plate of the main cable saddle remains horizontal.

[0013] Furthermore, the pre-installed structural base plate, the pre-installed structural secondary base plate, and the post-installed structural top plate are arc-shaped.

[0014] In summary, compared with the prior art, the suspension bridge circular steel bridge tower top saddle stiffening section structure of this utility model has at least the following beneficial effects:

[0015] 1. The structure adopts a double-layer top and bottom plate and a four-web plate structure, which significantly improves the bending and shear bearing capacity without changing the structural dimensions and maximum plate thickness. The transverse diaphragms of the pre-installed structure are of three types: solid web diaphragms, frame diaphragms, and half-diaphragms. The half-diaphragms are set at intervals to ensure the stress performance, reduce the amount of steel used and the weight of the segment hoisting, and also increase the processing space at the bottom. The middle uses solid web diaphragms with greater stiffness and the two sides use frame diaphragms with less stiffness to alleviate the uneven force transmission caused by the unloading of the saddle in the middle due to the deformation of the tower top. The part above the main cable saddle is designed as a post-installed structure and will be installed after the main cable construction is completed, which facilitates the main cable construction. The transverse diaphragms of the post-installed structure are all frame diaphragms, leaving enough space for the maintenance of the main cable saddle.

[0016] 2. This utility model addresses the technical challenges in the structural design of the stiffening section of the saddle seat at the top of a circular steel bridge tower for suspension bridges. It innovatively adopts technologies such as partial post-installation of the structure, double-layer top and bottom plates and four-web plate structure, and reasonable arrangement of various diaphragm forms. These technologies improve the stress performance of the stiffening section at the top of the tower, while reducing the amount of steel used and the weight of the segment hoisting, and increasing the processing space at the bottom and the maintenance space of the main cable saddle. The social and economic benefits are outstanding, filling a technical gap in the application of circular bridge towers to long-span suspension bridges.

[0017] 3. This utility model innovatively adopts technologies such as partial post-installation of structure, double-layer top and bottom plate and four-web plate structure, and reasonable arrangement of various partition forms, which breaks through the technical difficulties faced in the structural design of the stiffening section of the saddle seat at the top of the circular steel bridge tower of the suspension bridge.

[0018] 4. The tower top saddle stiffening section structure proposed in this utility model ensures good stress performance, reduces steel consumption and segment hoisting weight, while also increasing the processing space at the bottom and the maintenance space of the main cable saddle, making it economical and practical.

[0019] 5. The tower base saddle stiffening section, through a reasonable structural design, ensures that the force of the main cable saddle can be evenly and smoothly transmitted to the bridge tower. The tower top saddle stiffening section improves bending and shear resistance while maintaining the same structural dimensions and maximum plate thickness, thus withstanding the enormous bending moment and shear force at the top of the circular bridge tower of the suspension bridge, and meeting the functional requirements for main cable construction and maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an elevation view of the stiffening section of the saddle seat at the top of the circular steel bridge tower of the suspension bridge according to this utility model.

[0022] Figure 2 This is a cross-sectional view of one half of the partition of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of the frame partition of this utility model;

[0024] Figure 4 This is a cross-sectional structural diagram of the solid-web partition of this utility model.

[0025] In the diagram: 1-First transverse diaphragm (half a diaphragm); 2-Second transverse diaphragm (frame diaphragm); 3-Third transverse diaphragm (half a diaphragm); 4-Fourth transverse diaphragm (solid diaphragm); 5-Fifth transverse diaphragm (half a diaphragm); 6-Sixth transverse diaphragm (solid diaphragm); 7-Seventh transverse diaphragm (half a diaphragm); 8-Eighth transverse diaphragm (frame diaphragm); 9-Ninth transverse diaphragm (half a diaphragm); 1 0-Main cable saddle (also known as saddle seat); 11-Pre-installed structure; 12-Rear-installed structure; 13-Top plate of the pre-installed structure; 14-Secondary top plate of the pre-installed structure; 15-Secondary bottom plate of the pre-installed structure; 16-Bottom plate of the pre-installed structure; 17-Top plate of the rear-installed structure; 18-Frame diaphragm; 19-Inner web plate; 20-Circular arc segment; 21-Straight line segment; 22-Tangent point; 23-Top plate rib; 24-Longitudinal diaphragm; 25-Main cable saddle body. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See below. Figures 1-4 This invention provides a detailed description of the stiffening section structure of the saddle seat at the top of the circular steel bridge tower of a suspension bridge.

[0028] like Figures 1-4 As shown, the suspension bridge circular steel bridge tower top saddle stiffening section structure of this utility model includes a main cable saddle 10 (also known as a saddle seat). The part below the main cable saddle 10 is designed as a pre-installed structure 11, and the part above the main cable saddle 10 is designed as a post-installed structure 12. The post-installed structure 12 will be installed after the main cable construction is completed.

[0029] The pre-installed structure 11 includes, from top to bottom, a pre-installed top plate 13, a pre-installed secondary top plate 14, a pre-installed secondary bottom plate 15, and a pre-installed bottom plate 16. The pre-installed structure 11 employs a double-layered top and bottom plate system. The double-layered top plate is composed of the pre-installed top plate 13 and the pre-installed secondary top plate 14, and the double-layered bottom plate is composed of the pre-installed secondary bottom plate 15 and the pre-installed bottom plate 16. The post-installed structure 12 includes a post-installed top plate 17 and frame diaphragms 18 located around the main cable saddle 10. All transverse diaphragms of the post-installed structure 12 are frame diaphragms 18, providing sufficient space for the maintenance of the main cable saddle 10. The pre-installed bottom plate 16, the pre-installed secondary bottom plate 15, and the post-installed top plate 17 are designed in an arc shape to ensure the overall rounded shape of the circular bridge tower. The top plate of the pre-installed structure 11 is designed to be horizontal, ensuring that the bottom plate of the main cable saddle 10 remains horizontal and meeting the requirements for jacking during the construction of the main cable saddle 10.

[0030] Nine transverse diaphragms are provided between the pre-installed top slab 13 and the pre-installed bottom slab 16. The transverse diaphragms of the pre-installed structure 11 are of three types: solid diaphragms, frame diaphragms, and half diaphragms. The first, third, fifth, seventh, and ninth transverse diaphragms are half diaphragms and are arranged alternately, with the fifth diaphragm 5 located in the middle. The fourth and sixth transverse diaphragms are solid diaphragms and are located between the third and fifth diaphragms 3 and the seventh diaphragm 5, respectively. The second and eighth transverse diaphragms are frame diaphragms and are located between the first and third diaphragms 3, the seventh and ninth diaphragms 7, respectively. The half of the partitions 1, 3, 5, 7, and 9 are spaced apart to ensure load-bearing performance, reduce steel consumption and segment lifting weight, while also increasing the processing space at the bottom. Solid web partitions 4 and 6 with higher stiffness are used in the middle, while frame partitions 2 and 8 with lower stiffness are used on both sides to alleviate uneven force transmission caused by unloading in the middle of the saddle (main cable saddle 10) due to tower top deformation. The frame partition 18 of the later-installed structure 12 is aligned with half of the partitions 1, 3, 5, 7, and 9 of the earlier-installed structure 11.

[0031] The pre-installed structure 11 employs a four-web structure between its secondary top plate 14 and bottom plate 16. This four-web structure is designed to withstand the immense shear force generated at the top of the tower by the main cable saddle 10. The four-web structure consists of two vertical inner webs 19 and two outer webs. The two inner webs 19 are aligned transversely with the main cable saddle body 25 of the main cable saddle 10, ensuring smooth and direct force transmission. The two outer webs feature a rounded, tangential shape, creating a three-dimensional and full appearance for the circular bridge tower. Each outer web consists of a circular arc segment 20 and straight segments 21 located at both ends of the arc segment 20. The arc segment 20 and the straight segments 21 are tangent at the point 22 on the outer web.

[0032] In addition, a top plate rib 23 and a longitudinal diaphragm 24 are provided between the pre-installed structural top plate 13 and the pre-installed structural secondary top plate 14. The top plate rib 23 of the pre-installed structure 11 transitions into the longitudinal diaphragm 24 in the saddle area, and together with the transverse diaphragm of the pre-installed structure 11, forms a steel grid between the pre-installed structural top plate 13 and the pre-installed structural secondary top plate 14, increasing the local bearing area and making the force of the main cable saddle 10 more evenly transmitted to the steel tower.

[0033] This invention divides the tower top saddle stiffening section into a pre-installed structure 11 and a post-installed structure 12. The portion below the main cable saddle 10 is designed as the pre-installed structure 11, while the portion above the main cable saddle 10 is designed as the post-installed structure 12. The post-installed structure 12 will be installed after the main cable construction is completed, facilitating the main cable construction. The top and bottom plates of the pre-installed structure 11 adopt a double-layer structure to increase the bending moment of inertia of the cross-section, thereby withstanding the huge bending moment generated at the tower top by the force of the main cable saddle 10. The tower top saddle stiffening section structure of this invention for a circular steel bridge tower of a suspension bridge has the following advantages:

[0034] (1) The double-layer top and bottom plate and four-web plate structure is adopted, which significantly improves the bending and shear bearing capacity without changing the structural size and maximum plate thickness, and avoids the impact of excessive structural size on the landscape effect or steel plate. The two vertical inner web plates 19 are aligned with the saddle body of the main cable saddle 10, so that the force transmission is smooth and direct. The two outer web plates adopt the shape of arc and tangent, which creates the three-dimensionality and fullness of the circular bridge tower.

[0035] (2) The bottom plate 16 of the pre-installed structure and the top plate 17 of the post-installed structure are designed to be arc-shaped to ensure the overall round shape of the circular bridge tower; the top plate of the pre-installed structure is designed to be horizontal so that the bottom plate of the main cable saddle 10 remains horizontal, which meets the requirements of the main cable saddle 10 during construction.

[0036] (3) The top plate rib 23 of the pre-installed structure 11 transitions into a longitudinal diaphragm 24 in the saddle area. Together with the transverse diaphragm, it forms a steel grid between the top plate 13 and the secondary top plate 14 of the pre-installed structure, increasing the local bearing area and making the force of the main cable saddle 10 more evenly transmitted to the steel tower.

[0037] (4) The transverse diaphragm of the first-installed structure 11 adopts three forms: solid web diaphragm, frame diaphragm, and half diaphragm. The half diaphragm is set at intervals to ensure the stress performance, reduce the amount of steel used and the weight of the segment hoisting, and also increase the processing space at the bottom. The middle adopts a solid web diaphragm with greater stiffness and the two sides adopt a frame diaphragm with less stiffness to alleviate the uneven force transmission caused by the unloading of the saddle in the middle due to the deformation of the tower top.

[0038] (5) The post-installed structure 12 will be installed after the main cable construction is completed, which will facilitate the main cable construction. The transverse diaphragms of the post-installed structure 12 are all frame diaphragms 18, leaving enough space for the maintenance of the main cable saddle 10.

[0039] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of this utility model.

Claims

1. A suspension bridge circular steel tower top saddle stiffening section structure, characterized in that, The first installation structure (11) is arranged below the main cable saddle (10), and the second installation structure (12) is arranged above the main cable saddle (10); The first installation structure (11) comprises a first installation structure top plate (13), a first installation structure secondary top plate (14), a first installation structure secondary bottom plate (15) and a first installation structure bottom plate (16) arranged in sequence from top to bottom, wherein a top plate rib (23) and a longitudinal partition plate (24) are arranged between the first installation structure top plate (13) and the first installation structure secondary top plate (14); nine horizontal partition plates are arranged between the first installation structure top plate (13) and the first installation structure bottom plate (16), and a four-web structure is arranged between the first installation structure secondary top plate (14) and the first installation structure bottom plate (16); The second installation structure (12) comprises a second installation structure top plate (17) and a frame partition plate (18) arranged at the periphery of the main cable saddle (10).

2. The round steel pylon top saddle stiffening section structure of a suspension bridge according to claim 1, characterized in that, The four-web structure comprises two vertical inner side webs (19) aligned with the main cable saddle body (25) of the main cable saddle (10) in the transverse bridge direction, and two outer side webs in a circular arc plus tangent modeling.

3. The suspension bridge circular steel tower top saddle stiffening section structure according to claim 2, characterized in that, The outer side web is composed of a circular arc segment (20) and a straight line segment (21) at both ends of the circular arc segment (20), and the circular arc segment (20) is tangent to the straight line segment (21) at the tangent point (22) of the outer side web.

4. The suspension bridge circular steel tower top saddle stiffening section structure according to claim 1, characterized in that, The nine horizontal partition plates are in the form of solid-web partition plates, frame partition plates and half partition plates.

5. The suspension bridge circular steel tower top saddle stiffening segment structure according to claim 4, characterized in that, The first horizontal partition plate (1), the third horizontal partition plate (3), the fifth horizontal partition plate (5), the seventh horizontal partition plate (7) and the ninth horizontal partition plate (9) are half partition plates and are arranged in sequence with intervals, and the fifth horizontal partition plate (5) is located in the middle position; the fourth horizontal partition plate (4) and the sixth horizontal partition plate (6) are solid-web partition plates and are located between the third horizontal partition plate (3) and the fifth horizontal partition plate (5) and between the fifth horizontal partition plate (5) and the seventh horizontal partition plate (7), respectively; the second horizontal partition plate (2) and the eighth horizontal partition plate (8) are frame partition plates and are located between the first horizontal partition plate (1) and the third horizontal partition plate (3) and between the seventh horizontal partition plate (7) and the ninth horizontal partition plate (9), respectively.

6. The round steel pylon top saddle stiffening segment structure of a suspension bridge according to claim 4 or 5, characterized in that, The top plate rib (23) transitions to the longitudinal partition plate (24) in the saddle area, and together with the horizontal partition plates of the first installation structure (11), forms a steel grid between the first installation structure top plate (13) and the first installation structure secondary top plate (14).

7. The suspension bridge circular steel tower top saddle stiffening segment structure according to claim 1, characterized in that, The first installation structure top plate (13) and the first installation structure secondary top plate (14) are arranged horizontally, so that the bottom plate of the main cable saddle (10) remains horizontal.

8. The suspension bridge circular steel tower top saddle stiffening segment structure according to claim 1, characterized in that, The first installation structure bottom plate (16), the first installation structure secondary bottom plate (15) and the second installation structure top plate (17) are arc-shaped.

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