New construction platform structure for cable-stayed bridge installation

Abstract

This utility model discloses a novel construction platform structure for cable-stayed bridge installation. The structure includes a load-bearing unit, a support unit, and embedded parts. The support unit is located at the bottom of the load-bearing unit, and the embedded parts are pre-embedded within the tower crown of the cable-stayed bridge. Two support units are symmetrically arranged on the tower crown via the embedded parts. By adopting an all-steel structure design, and through a grid-like welded load-bearing surface, fully penetrated nodes, and a multi-dimensional support system, a rigid overall structure is formed, exhibiting strong resistance to deformation. It can withstand concentrated loads (such as winches and tensioning equipment) and uniformly distributed loads (personnel and materials), adapting to the heavy-load requirements of cable-stayed bridge installation. The modular prefabrication design (load-bearing and support units can be assembled on the ground) reduces the amount of high-altitude work. By pre-fixing the embedded parts to the tower crown and combining this with the overall hoisting process, the on-site installation time is significantly shortened, resulting in a shorter construction period compared to traditional scaffolding platforms.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, and in particular to a novel construction platform structure for cable-stayed bridge installation. Background Technology

[0002] In the field of bridge engineering, the installation of stay cables at the top of cable-stayed bridge towers is a core process that determines the safety of bridge structure and construction efficiency. It involves high-altitude heavy-load operations (such as equipment hoisting, cable tensioning, cable threading and adjustment), which places stringent requirements on the structural stability, load-bearing capacity, safety protection and adaptability of the construction platform.

[0003] Traditional construction platforms often rely on non-steel structure materials such as timber and scaffolding, which makes it difficult to meet the special requirements of cable-stayed bridge installation. Specific limitations are as follows:

[0004] Wooden construction platform: It is composed of wood, steel pipes and fasteners. Although it has a certain assembly and adjustment capability, the overall structural strength is low and the deformation resistance is poor. It is prone to warping or collapse under the action of strong winds at high altitudes and heavy loads (such as tensioning equipment and the weight of the cable itself). In addition, wood is susceptible to environmental corrosion, has a short service life, and poses prominent safety hazards.

[0005] Scaffolding construction platform: It is built layer by layer by steel pipes, iron parts and connectors. The process is complicated and the construction period is long. The node connection relies on the interlocking of fasteners, which is not reliable enough. The overall wind load resistance and lateral stability are weak and it is difficult to withstand the instantaneous impact load when the cable stays are installed.

[0006] Suspended platform: It is suspended outside the tower body and can be raised and lowered flexibly, but its load-bearing capacity is limited (usually ≤5kN). It is only suitable for light maintenance work and cannot meet the heavy load requirements of equipment hoisting (such as winches and tension jacks) and multi-person collaborative work required for cable-stayed installation. In addition, the suspended structure is prone to affecting the construction accuracy due to swaying.

[0007] In addition, traditional platforms have a large amount of on-site processing and low assembly efficiency, making them difficult to adapt to the complex procedures in the narrow space on the top of cable-stayed bridge towers, which seriously restricts the quality and progress of cable-stayed cable installation.

[0008] Therefore, there is an urgent need for a new type of construction platform that is structurally stable, has reliable load-bearing capacity, is highly efficient in installation, and is compatible with the entire process of cable-stayed bridge installation. Utility Model Content

[0009] The purpose of this invention is to provide a novel construction platform structure for cable-stayed bridge installation, in order to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0011] A novel construction platform structure for cable-stayed bridge installation includes a load-bearing unit, a support unit, and embedded parts. The support unit is located at the bottom of the load-bearing unit, and the embedded parts are pre-embedded within the tower crown of the cable-stayed bridge. Two support units are symmetrically arranged on the tower crown via the embedded parts.

[0012] The load-bearing unit includes longitudinal beams, transverse beams, and reinforcing beams. The longitudinal beams are parallel to the center line of the bridge and there are two of them. The transverse beams are perpendicular to the longitudinal beams and several are fixedly connected to the two longitudinal beams. A winch is installed on the two transverse beams located on the outermost side. The reinforcing beams are welded to the longitudinal beams and are parallel to the transverse beams. The reinforcing beams and transverse beams are spaced apart.

[0013] As a preferred technical solution, the longitudinal beams and transverse beams are welded perpendicularly to form a grid-like load-bearing surface, and the intersection nodes are fully penetrated welds.

[0014] As a preferred technical solution, in one of the two transverse beams on which the winch is installed, a set of lifting rings is welded, with two lifting rings in each set, and they are located close to the reinforcing beam.

[0015] As a preferred technical solution, the support unit includes support rods, and multiple support rods are distributed along the length direction of the longitudinal beam. The top end of the support rod is welded and fixed to the longitudinal beam, and its bottom end is connected to the embedded part. The transverse beam is arranged in a corresponding manner with the two support rods below it.

[0016] As a preferred technical solution, inclined braces are welded at an angle to the upper parts of both sides of the support rod located on the far side and the bottom of the longitudinal beam.

[0017] As a preferred technical solution, the support unit further includes a first X-shaped frame and a second X-shaped frame. The first X-shaped frame is located between two longitudinal beams, and its four ends are respectively welded to the ends of two adjacent support rods. The second X-shaped frame is located in the middle below the longitudinal beams, and its four ends are respectively welded to the ends of two adjacent support rods.

[0018] As a preferred technical solution, the embedded part includes an embedded steel plate and an anchoring steel bar. The embedded steel plate is welded to the bottom end of the support rod, and one end of the anchoring steel bar is welded perpendicularly to the embedded steel plate, while the other end is embedded in the tower crown concrete.

[0019] As a preferred technical solution, the longitudinal beams and support rods are all made of No. 16 I-beams, the transverse beams are made of No. 12.6 I-beams, and the reinforcing beams are made of No. 10 channel steel.

[0020] This utility model has at least the following beneficial effects:

[0021] This application, through the adoption of an all-steel structure design, forms a rigid integral structure with a grid-like welded load-bearing surface, full penetration nodes, and a multi-dimensional support system. This structure exhibits strong resistance to deformation and can withstand concentrated loads (such as winches and tensioning equipment) as well as uniformly distributed loads (personnel and materials), adapting to the heavy-load requirements of cable-stayed bridge installation. The modular prefabrication design (load-bearing and support units can be assembled on the ground) reduces the amount of work at height. Pre-fixing with the tower crown via embedded parts, combined with an overall hoisting process, significantly shortens on-site installation time compared to traditional scaffolding platforms. Symmetrically arranged support units connect to the tower crown, adapting to different cable-stayed bridge tower crown structures. The size and material specifications of the load-bearing units can be adjusted according to the cable spacing, making it suitable for cable threading, tensioning, and hoisting processes in various scenarios, including large-span steel-concrete composite beam cable-stayed bridges. The load is transferred from the load-bearing units to the support units, and then distributed to the tower crown concrete structure via embedded parts, resulting in a clear and uniform force flow, avoiding localized stress concentration, and ensuring the structural safety of the tower crown and platform itself. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the connection structure between this utility model and the tower crown of a cable-stayed bridge;

[0023] Figure 2 This is a top view of the connection structure between the present invention and the cable-stayed bridge tower crown;

[0024] Figure 3 This is a schematic front view of the structure of this utility model;

[0025] Figure 4 This is a side view of the structure of this utility model.

[0026] In the diagram: 100, load-bearing unit; 110, longitudinal beam; 120, transverse beam; 121, lifting ring; 130, reinforcing beam; 200, support unit; 210, support rod; 211, diagonal brace; 220, first X-shaped frame; 230, second X-shaped frame; 300, embedded part. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1-4This utility model provides a novel construction platform structure for cable-stayed bridge installation, including a load-bearing unit 100, a support unit 200, and embedded parts 300. The support unit 200 is located at the bottom of the load-bearing unit 100, and the embedded parts 300 are embedded in the tower crown of the cable-stayed bridge. Two support units 200 are symmetrically arranged on the tower crown via the embedded parts 300. The load-bearing unit 100 includes a longitudinal beam 110, a transverse beam 120, and a reinforcing beam 130. The longitudinal beam 110 is parallel to the bridge centerline and there are two of them. The transverse beam 120 and the longitudinal beam 110 are... The 0s are arranged perpendicularly to each other, and several are fixedly connected to the two longitudinal beams 110. The two transverse beams 120 located at the far side are jointly equipped with winches. The reinforcing beams 130 are welded to the longitudinal beams 110 and are arranged parallel to each other with the transverse beams 120. The reinforcing beams 130 and the transverse beams 120 are spaced apart, forming a complete load-bearing, support and foundation system. The symmetrically arranged support units 200 balance the load on the tower crown, avoid the tower crown bias caused by unilateral load, and ensure the reliability of the connection between the platform and the tower crown, providing basic structural protection for subsequent heavy-load operations.

[0029] Among them, the longitudinal beam 110 and the transverse beam 120 are perpendicularly welded to form a grid-like load-bearing surface, and the intersection nodes are fully penetrated welded; the grid-like structure increases the load-bearing area and distributes the load, and the fully penetrated welded nodes eliminate the connection gaps, improve the shear and tensile strength of the nodes, so that the load-bearing surface can withstand uniformly distributed loads, meeting the needs of multi-person collaborative work and material stacking.

[0030] Among them, one of the two transverse beams 120 on which the winch is installed is welded with a set of lifting rings 121. Each set of lifting rings 121 has two rings and is located close to the reinforcing beam 130. The lifting rings 121 work together with the tower crane to realize the lifting operation of the platform. The position close to the reinforcing beam 130 avoids local overload at the end of the longitudinal beam 110, thereby improving the safety of lifting and the convenience of operation.

[0031] The support unit 200 includes support rods 210, which are distributed along the length of the longitudinal beam 110. The top of the support rod 210 is welded and fixed to the longitudinal beam 110, and its bottom is connected to the embedded part 300. The transverse beam 120 is correspondingly set with the two support rods 210 below it. The support rods 210 form point-to-point support, and the load of the transverse beam 120 is directly transferred to the embedded part 300 through the corresponding support rods 210, reducing the loss in the force transmission path. The distribution of multiple support rods 210 makes the longitudinal beam 110 bear force evenly and avoids local bending deformation.

[0032] Among them, the upper parts of the two sides of the support rod 210 located on the far side are respectively welded with diagonal braces 211 at an incline between them and the bottom of the longitudinal beam 110. The diagonal braces 211 form a triangular stable structure, which enhances the lateral displacement resistance of the support rod 210 (especially resisting high-altitude wind loads), reduces the risk of the support rod 210 tilting due to unilateral force, and improves the overall stability of the support unit 200.

[0033] The support unit 200 also includes a first X-shaped frame 220 and a second X-shaped frame 230. The first X-shaped frame 220 is located between two longitudinal beams 110, and its four ends are welded to the ends of two adjacent support rods 210. The second X-shaped frame 230 is located in the middle below the longitudinal beams 110, and its four ends are welded to the ends of two adjacent support rods 210. The X-shaped frames connect adjacent support rods 210 into a whole through cross nodes. The first X-shaped frame 220 enhances the lateral stiffness between the two longitudinal beams 110, and the second X-shaped frame 220 strengthens the support strength in the middle of the longitudinal beams 110, thus improving the torsional and deformation resistance of the support unit 200.

[0034] The embedded part 300 includes an embedded steel plate and an anchoring steel bar. The embedded steel plate is welded to the bottom end of the support rod 210. One end of the anchoring steel bar is welded perpendicularly to the embedded steel plate, and the other end is embedded in the tower crown concrete. The embedded steel plate increases the contact area between the support rod 210 and the tower crown, and the anchoring steel bar penetrates into the concrete to form a mechanical interlock, so as to reliably transfer the platform load (tension and pressure) to the tower crown structure and avoid relative slippage between the embedded part 300 and the tower crown.

[0035] Among them, the longitudinal beam 110 and the support rod 210 are both made of No. 16 I-beams, the transverse beam 120 is made of No. 12.6 I-beams, and the reinforcing beam 130 is made of No. 10 channel steel. By matching the cross-sectional characteristics of the steel (such as the bending strength of No. 16 I-beams and the shear strength of No. 10 channel steel) with the actual load requirements, lightweight design is achieved while meeting the load-bearing capacity, reducing the additional load on the tower crown, and taking into account both safety and economy.

[0036] The working principle of this utility model is as follows:

[0037] Design and Planning: Based on specific project requirements and construction conditions, design and plan the new type of cable-stayed bridge installation platform. This includes considerations such as structural design, material selection, platform size and shape, to ensure that project requirements and safety are met;

[0038] Material Procurement and Manufacturing: Based on the design plan, procure appropriate steel structure materials and manufacture them. Materials should meet relevant national standards and quality requirements to ensure the platform's stability and load-bearing capacity.

[0039] Construction and installation: According to the design plan and construction process, the new cable-stayed bridge installation platform is constructed and installed: During the construction of the tower crown, embedded parts 300 are pre-embedded; the load-bearing unit 100 and the support unit 200 are assembled on the ground, all by welding, and all nodes are steel nodes; the whole structure is lifted by a tower crane to the tower crown and welded to the embedded parts 300.

[0040] Safety facilities and maintenance: Install and configure appropriate safety facilities, such as anti-slip devices, safety nets, safety handrails and fall arrestors, to provide safety assurance;

[0041] Load bearing and transmission: The grid-like load-bearing surface of the load-bearing unit 100 directly bears the loads of construction personnel, equipment, cable-stayed structures, etc.; the load is transmitted to the longitudinal beam 110 through the transverse beam 120, and the longitudinal beam 110 collects the dispersed loads and transmits them to the bottom support unit 200.

[0042] Support and force transmission: The support rod 210 of the support unit 200 serves as the main force transmission component, transferring the load from the longitudinal beam 110 to the embedded part 300; the corresponding arrangement of the transverse beam 120 and the corresponding support rod 210 ensures that the load is transmitted along the shortest path, reducing structural deformation; the diagonal brace 211 constrains the lateral displacement of the support rod 210 through the triangular stabilizing structure, and the X-shaped frame connects adjacent support rods 210 into a whole, avoiding overload of a single support rod 210 and making the load evenly distributed within the support unit 200;

[0043] Final load-bearing capacity: The anchoring steel bars of the pre-embedded part 300 are embedded in the concrete of the tower crown. Through the concrete bond force and the welding action of the pre-embedded steel plate, the load (vertical force and horizontal force) transmitted from the support unit 200 is finally transferred to the tower crown structure, so that the entire platform and the tower crown form a rigid whole, resisting various loads (gravity, wind load, tension reaction force, etc.) in high-altitude operations, and ensuring construction safety and accuracy.

[0044] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model 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 this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel construction platform structure for cable-stayed bridge installation, characterized in that, The structure includes a load-bearing unit (100), a support unit (200), and embedded parts (300). The support unit (200) is located at the bottom of the load-bearing unit (100). The embedded parts (300) are embedded in the tower crown of the cable-stayed bridge. Two support units (200) are symmetrically arranged on the tower crown via the embedded parts (300). The load-bearing unit (100) includes a longitudinal beam (110), a transverse beam (120), and a reinforcing beam (130). The longitudinal beam (110) is parallel to the center line of the bridge and there are two of them. The transverse beam (120) is perpendicular to the longitudinal beam (110) and several are fixedly connected to the two longitudinal beams (110). A winch is installed on the two transverse beams (120) located on the far side. The reinforcing beam (130) is welded to the longitudinal beam (110) and is parallel to the transverse beam (120). The reinforcing beam (130) and the transverse beam (120) are spaced apart.

2. The novel construction platform structure for cable-stayed cable installation according to claim 1, characterized in that: The longitudinal beam (110) and the transverse beam (120) are perpendicularly welded to form a grid-like load-bearing surface, and the intersection nodes are fully penetrated welds.

3. The novel construction platform structure for cable-stayed cable installation according to claim 2, characterized in that: Two transverse beams (120) on which the winch is installed are provided, and one of the transverse beams (120) is welded with a set of lifting rings (121). Each set of lifting rings (121) has two rings and is located close to the reinforcing beam (130).

4. The novel construction platform structure for cable-stayed cable installation according to claim 3, characterized in that: The support unit (200) includes support rods (210), and multiple support rods (210) are distributed along the length direction of the longitudinal beam (110). The top end of the support rod (210) is welded and fixed to the longitudinal beam (110), and its bottom end is connected to the embedded part (300). The transverse beam (120) is arranged in a corresponding manner with the two support rods (210) below it.

5. The novel construction platform structure for cable-stayed cable installation according to claim 4, characterized in that: The upper parts of the support rod (210) located on the far side are respectively inclinedly welded with diagonal braces (211) between the bottom of the longitudinal beam (110) and the upper part of the support rod (210) on both sides.

6. The novel construction platform structure for cable-stayed cable installation according to claim 5, characterized in that: The support unit (200) further includes a first X-shaped frame (220) and a second X-shaped frame (230). The first X-shaped frame (220) is located between two longitudinal beams (110), and the four ends of the first X-shaped frame (220) are respectively welded to the ends of two adjacent support rods (210). The second X-shaped frame (230) is located in the middle below the longitudinal beams (110), and the four ends of the second X-shaped frame (230) are respectively welded to the ends of two adjacent support rods (210).

7. The novel construction platform structure for cable-stayed cable installation according to claim 6, characterized in that: The embedded part (300) includes an embedded steel plate and an anchoring steel bar. The embedded steel plate is welded to the bottom end of the support rod (210). One end of the anchoring steel bar is welded perpendicularly to the embedded steel plate, and the other end is embedded in the tower crown concrete.

8. The novel construction platform structure for cable-stayed cable installation according to claim 7, characterized in that: The longitudinal beam (110) and the support rod (210) are both made of No. 16 I-beams, the transverse beam (120) is made of No. 12.6 I-beams, and the reinforcing beam (130) is made of No. 10 channel steel.

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