Large-diameter connection node steel member for cable-stayed bridge

Abstract

The utility model discloses a large-diameter connecting node steel member for a cable-stayed bridge, which relates to the technical field of cable-stayed bridges and comprises a base, a connecting mechanism is arranged at the top of the base and used for reinforcing member stress, the connecting mechanism comprises a stress reinforcing unit and a base unit, and the stress reinforcing unit is arranged above the base and comprises a connecting hollow shaft. First connecting discs are fixedly installed on the surfaces of the two ends of the connecting hollow shaft, a plurality of first reinforcing ribs are installed between the first connecting discs and the connecting hollow shaft in a circumferential array mode, and component stress is reinforced through the first connecting discs and the first reinforcing ribs. The base unit is arranged above the base and used for providing pulling stress of the steel cable, the first connecting discs arranged at the two ends of the connecting hollow shaft and the first reinforcing ribs arranged in a circumferential array are combined with the nested fixing hollow shaft, the second connecting discs and the second reinforcing ribs, a multi-layer composite force transmission path is formed, and fatigue crack initiation under alternating loads is restrained.

Description

Technical Field

[0001] This utility model relates to the field of cable-stayed bridge technology, specifically to a large-diameter connecting node steel component for cable-stayed bridges. Background Technology

[0002] As a typical example of modern long-span bridges, cable-stayed bridges consist of a core structure comprised of towers, main girders, and stay cables. Among these, large-diameter connecting steel members, serving as the connection hubs between the stay cables and the main girders or towers, are crucial components ensuring the overall load-bearing performance and safety of the bridge.

[0003] According to the patent titled "Large-span Steel Structure Cable-stayed Connection Node" (patent publication number: CN219410547U, patent publication date: 2023-07-25), it includes a vertically arranged steel column, on which a first ear plate group and a second ear plate group are fixedly installed. The first and second ear plate groups are symmetrical with respect to the steel column. Each of the first and second ear plate groups includes multiple ear plates arranged in parallel. Anchor lock heads for cable connection are fixedly installed at the ends of the first and second ear plate groups away from the steel column. The large-span steel structure cable-stayed connection node can solve the problem of welding and fixing the cable ear plates, and avoid the problems of dense welds in the column causing the heat-affected zone to overlap, welding stress concentration, and difficulty in welding some welds. It can also effectively increase the stiffness of the node, prevent the thick plate from tearing in layers, and by setting ear plate abutments, effectively avoid the problem of excessive distance between the anchor lock head and the ear plate after installation. It has certain promotional value.

[0004] Based on the aforementioned existing technologies, the large-diameter connecting node steel components used in existing cable-stayed bridges still have the following problems: traditional welded nodes are prone to local stress exceeding limits under alternating loads, leading to fatigue cracks, and large-diameter components will produce inelastic deformation under wind vibration. Therefore, this utility model provides a large-diameter connecting node steel component for cable-stayed bridges. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a large-diameter connecting node steel component for cable-stayed bridges, which solves the following problems that existing large-diameter connecting node steel components for cable-stayed bridges still have: traditional welded nodes are prone to local stress exceeding limits under alternating loads, leading to fatigue cracks, and large-diameter components will produce inelastic deformation under wind vibration.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a large-diameter connecting node steel member for cable-stayed bridges, comprising a base, wherein a connecting mechanism is provided on the top of the base to strengthen the stress of the member, the connecting mechanism comprising:

[0007] A stress-strengthening unit is disposed above the base and includes a connecting hollow shaft. Both ends of the connecting hollow shaft are fixedly mounted with first connecting discs, and a plurality of first reinforcing ribs are circumferentially arrayed between the first connecting discs and the connecting hollow shaft. The stress of the component is strengthened through the first connecting discs and the first reinforcing ribs.

[0008] The base unit is located above the base and is used to provide tensile stress for the steel cable.

[0009] Preferably, both ends of the connecting hollow shaft are inserted and installed with fixed hollow shafts, and a second connecting plate is fixedly installed on the outer end surface of the fixed hollow shaft. A number of second reinforcing ribs are installed in a circumferential array between the second connecting plate and the fixed hollow shaft to achieve quick installation of the connecting hollow shaft.

[0010] Preferably, a solid shaft is inserted and installed inside the fixed hollow shaft, and a nut is threaded onto one end of the solid shaft to fix and support the hollow shaft.

[0011] Preferably, the solid shaft has a plurality of support bars arranged in a circumferential array on its surface to enhance the bending strength of the fixed hollow shaft and the connecting hollow shaft.

[0012] Preferably, the base unit includes a set of fixing plates fixedly installed on the top of the base. A left connecting plate and a right connecting plate are fixedly installed on the left and right sides of the fixing plates. Three sets of left reinforcing ribs are fixedly installed between the left connecting plate and the base. Three sets of right reinforcing ribs are fixedly installed between the right connecting plate and the base. A first connecting plate is fixedly installed inside the fixing plate by bolts, and a second connecting plate is fixedly installed outside the fixing plate by bolts.

[0013] Preferably, a limit frame is fixedly installed on the top of the fixing plate to limit the movement of the steel cable connector.

[0014] This utility model provides a large-diameter connecting node steel member for cable-stayed bridges. Compared with the prior art, it has the following advantages:

[0015] 1. The large-diameter connecting node steel components used in this cable-stayed bridge are formed by setting first connecting discs and first reinforcing ribs in a circular array at both ends of the connecting hollow shaft, combined with nested fixed hollow shafts, second connecting discs, and second reinforcing ribs, to form a multi-layer composite force transmission path, which suppresses the initiation of fatigue cracks under alternating loads.

[0016] 2. The large-diameter connecting steel components used in this cable-stayed bridge achieve axial preload control by inserting a solid shaft with support bars inside a fixed hollow shaft and locking it with a nut. The support bars and the solid shaft form an internal bending-resistant skeleton, which improves the bending stiffness of the cross section and effectively suppresses inelastic deformation caused by wind vibration. Attached Figure Description

[0017] Figure 1 This is a left-side perspective view of the three-dimensional structure of this utility model;

[0018] Figure 2 This is a partially disassembled three-dimensional structural diagram of the present invention;

[0019] Figure 3 This is a partial right-side perspective view of the present invention.

[0020] Figure 4 This is a partially disassembled left-side stereoscopic structural diagram of the present invention.

[0021] In the figure: 1-base, 2-connecting mechanism, 21-stress-strengthening unit, 211-connecting hollow shaft, 212-first connecting plate, 213-first reinforcing rib, 214-fixed hollow shaft, 215-second connecting plate, 216-second reinforcing rib, 217-solid shaft, 218-support bar, 219-nut, 22-base unit, 221-fixing plate, 222-left connecting plate, 223-left reinforcing rib, 224-right connecting plate, 225-right reinforcing rib, 226-limiting frame. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-4 This utility model provides a technical solution:

[0024] A large-diameter connecting node steel member for a cable-stayed bridge includes a base 1, and a connecting mechanism 2 is provided on the top of the base 1 to strengthen the stress of the member. The connecting mechanism 2 includes:

[0025] The stress strengthening unit 21 is disposed above the base 1 and includes a connecting hollow shaft 211. Both ends of the connecting hollow shaft 211 are fixedly mounted with first connecting discs 212, and a plurality of first reinforcing ribs 213 are circumferentially arranged between the first connecting discs 212 and the connecting hollow shaft 211. The stress of the component is strengthened through the first connecting discs 212 and the first reinforcing ribs 213.

[0026] The base unit 22 is disposed above the base 1 and is used to provide tensile stress for the steel cable.

[0027] By connecting the two ends of the hollow shaft 211 with the first connecting disk 212 and the first reinforcing rib 213 in a circular array, and combining the nested fixed hollow shaft 214 with the second connecting disk 215 and the second reinforcing rib 216, a multi-layer composite force transmission path is formed to suppress the initiation of fatigue cracks under alternating loads.

[0028] In this embodiment, both ends of the connecting hollow shaft 211 are inserted and installed with fixed hollow shafts 214, and a second connecting plate 215 is fixedly installed on the outer end surface of the fixed hollow shaft 214. A number of second reinforcing ribs 216 are installed in a circumferential array between the second connecting plate 215 and the fixed hollow shaft 214 to achieve quick installation of the connecting hollow shaft 211.

[0029] The nested structure enables modular assembly, reducing on-site welding by 60% and improving installation efficiency. The second reinforcing rib 216 evenly transfers the load to the fixed hollow shaft 214, reducing stress concentration at the end of the connecting hollow shaft 211.

[0030] In this embodiment, a solid shaft 217 is inserted and installed inside the fixed hollow shaft 214, and a nut 219 is threaded on one end of the solid shaft 217 to fix the hollow shaft 214 and support the connecting hollow shaft 211. Several support bars 218 are installed in a circumferential array on the surface of the solid shaft 217 to enhance the bending strength of the fixed hollow shaft 214 and the connecting hollow shaft 211.

[0031] By inserting a solid shaft 217 with a support bar 218 into the fixed hollow shaft 214 and locking it with a nut 219, the axial preload can be adjusted. The support bar 218 and the solid shaft 217 form an internal bending-resistant skeleton, which improves the bending stiffness of the cross section and effectively suppresses the inelastic deformation caused by wind vibration.

[0032] In this embodiment, the base unit 22 includes a set of fixing plates 221 fixedly installed on the top of the base 1. A left connecting plate 222 and a right connecting plate 224 are fixedly installed on the left and right sides of the fixing plate 221. Three sets of left reinforcing ribs 223 are fixedly installed between the left connecting plate 222 and the base 1, and three sets of right reinforcing ribs 225 are fixedly installed between the right connecting plate 224 and the base 1. A first connecting plate 212 is fixedly installed inside the fixing plate 221 by bolts, and a second connecting plate 215 is fixedly installed outside the fixing plate 221 by bolts.

[0033] The left stiffener 223 and the right stiffener 225 distribute the tension of the stay cable to the base 1, thereby reducing the peak stress of the base 1. The symmetrical design of the left connecting plate 222 and the right connecting plate 224 improves the resistance to lateral loads.

[0034] In this embodiment, a limit bracket 226 is fixedly installed on the top of the fixing plate 221 to limit the movement of the steel cable connector.

[0035] The limiting bracket 226, which is fixedly installed on the top of the fixing plate 221, is used to limit the movement of the steel cable connector.

[0036] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0037] During operation, firstly, the hollow shaft 211 is fixedly installed in the middle of the hollow shaft 211 by the first connecting plate 212 and bolts. The fixed hollow shaft 214 is inserted into the interior of the hollow shaft 211 and fixedly installed on the hollow shaft 211 by the second connecting plate 215 and bolts. Then, the solid shaft 217 is inserted into the interior of the fixed hollow shaft 214 and fixed by the nut 219.

[0038] Then, the steel cable connector is installed on the connecting hollow shaft 211, and the second reinforcing rib 216 is fixedly installed on the connecting hollow shaft 211 by bolts, with the bottom end of the second reinforcing rib 216 stuck on the connecting hollow shaft 211.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter connecting node steel member for a cable-stayed bridge, comprising a base (1), characterized in that: The top of the base (1) is provided with a connecting mechanism (2) for reinforcing component stress, which comprises: A stress reinforcing unit (21) is arranged above the base (1) and comprises a connecting hollow shaft (211), both ends of which are fixedly provided with a first connecting disc (212), and a plurality of first reinforcing ribs (213) are circumferentially arranged between the first connecting disc (212) and the connecting hollow shaft (211), so that the first connecting disc (212) and the first reinforcing ribs (213) can reinforce the component stress. A base unit (22) is arranged above the base (1) and is used to provide the pulling stress of the steel cable.

2. The large-diameter connecting node steel member for a cable-stayed bridge according to claim 1, characterized by: Both ends of the connecting hollow shaft (211) are inserted and fixedly provided with a fixed hollow shaft (214), and the outer end surface of the fixed hollow shaft (214) is fixedly provided with a second connecting disc (215), and a plurality of second reinforcing ribs (216) are circumferentially arranged between the second connecting disc (215) and the fixed hollow shaft (214), so as to realize the quick installation of the connecting hollow shaft (211).

3. The large-diameter connecting node steel member for a cable-stayed bridge according to claim 2, characterized by: The inside of the fixed hollow shaft (214) is inserted and fixedly provided with a solid shaft (217), and one end of the solid shaft (217) is threadedly rotated with a nut (219), so as to support the fixed hollow shaft (214) and the connecting hollow shaft (211).

4. The large-diameter connecting node steel member for a cable-stayed bridge according to claim 3, characterized by: A plurality of support strips (218) are circumferentially arranged on the surface of the solid shaft (217), so as to enhance the bending strength of the fixed hollow shaft (214) and the connecting hollow shaft (211).

5. The large-diameter connecting node steel member for a cable-stayed bridge according to claim 2, characterized by: The base unit (22) comprises a group of fixed plates (221) fixedly installed on the top of the base (1), left and right connecting plates (222) and (224) fixedly installed on the left and right sides of the fixed plate (221), three groups of left reinforcing ribs (223) fixedly installed between the left connecting plate (222) and the base (1), three groups of right reinforcing ribs (225) fixedly installed between the right connecting plate (224) and the base (1), the first connecting disc (212) fixedly installed in the fixed plate (221) through bolts, and the second connecting disc (215) fixedly installed outside the fixed plate (221) through bolts.

6. The large-diameter connecting node steel member for a cable-stayed bridge according to claim 5, characterized by: A limiting frame (226) is fixedly installed on the top of the fixed plate (221) and is used to limit the steel cable connector.

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