Bridge tower cross beam self-lifting type steel truss beam closure construction system

Abstract

The utility model relates to the technical field of bridge construction, and discloses a bridge tower cross beam self-lifting type steel truss beam closure construction system which comprises a tower column, the right end of the tower column is fixedly connected with a type steel framework, and the upper side and the lower side of the type steel framework are detachably provided with stacking plates through upper chord butt joints. The top end of the profile steel framework is fixedly connected with an embedded chord member connecting section, the top end of the embedded chord member connecting section is fixedly connected with a profile steel framework chord member, the top end of the right side of the profile steel framework is fixedly connected with an upper chord inlaying section, and the bottom end of the right side of the profile steel framework is fixedly connected with a lower chord inlaying section; pre-embedded upper chord connecting sections are arranged at the top ends of the profile steel framework chord members through connecting plates. According to the utility model, the adaptability and fault tolerance of closure are improved, the closure deviation caused by factors such as temperature change and the like is reduced, the technical complexity in the closure process is reduced, and the construction difficulty is reduced by reducing the degree of freedom required to be accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a bridge tower crossbeam self-lifting steel truss beam closure construction system. Background Technology

[0002] Steel truss structures in bridge construction are beam-type structural systems composed of steel members connected by nodes. They mainly consist of top chords, bottom chords, web members, and node plates connecting these members. Using steel as the primary material, steel truss structures fully utilize the advantages of steel, such as high strength, good toughness, and high machinability, making them suitable for bridge construction of various spans, and exhibiting particularly outstanding performance in long-span bridges.

[0003] Closure refers to the precise docking and connection of precast or assembled beam segments. It is a key step in achieving the integrity and final performance of the entire bridge structure, and the quality of closure directly affects the safety, stability and service life of the bridge.

[0004] Because the closure involves a great deal of detail and precision control, even slight deviations can affect the safety of the entire structure. For example, temperature changes can cause material expansion and contraction, affecting the accuracy of the closure. Uncertainty in the on-site construction environment and equipment limitations can also affect the accuracy and efficiency of the closure. Furthermore, the closure involves multiple contact points and degrees of freedom, such as the need to control deviations in the X, Y, and Z directions simultaneously, which greatly increases the complexity of the construction. To address these issues, a self-lifting steel truss beam closure construction system for bridge tower crossbeams is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a bridge tower crossbeam self-lifting steel truss beam closure construction system, which aims to improve the problem of complicated installation and closure in the existing technology.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a bridge tower crossbeam self-lifting steel truss beam closure construction system, including a tower column, a steel frame fixedly connected to the right end of the tower column, and detachable mounting plates on both the upper and lower sides of the steel frame via upper chord butt joints. A pre-embedded chord connecting section is fixedly connected to the top of the steel frame, and a steel frame chord is fixedly connected to the top of the pre-embedded chord connecting section. An upper chord insert section is fixedly connected to the top right side of the steel frame, and a lower chord insert section is fixedly connected to the bottom right side of the steel frame. A pre-embedded upper chord connecting section is provided at the top of the steel frame chord via a connecting plate. Side trusses, middle trusses, and secondary side trusses are respectively fixedly connected to the top of the steel frame chord.

[0007] As a further description of the above technical solution:

[0008] The left end of the connecting plate is detachably installed on the inner wall of the steel frame chord by bolts, and the right end of the connecting plate is fixedly connected to the outer wall of the pre-embedded upper chord connecting section.

[0009] As a further description of the above technical solution:

[0010] The steel frame is provided in two sets, and the chord of the steel frame is spaced 1-2m apart from the left end of the right side of the steel frame.

[0011] As a further description of the above technical solution:

[0012] The top of the steel frame is equipped with a lifting jack.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, by setting up the upper chord interlocking section, the lower chord interlocking section, the pre-embedded upper chord connecting section and its connecting plate, the adaptability and fault tolerance of the closure are improved, the closure deviation caused by factors such as temperature changes is reduced, and the technical complexity of the closure process is reduced. By reducing the degree of freedom that needs to be precisely controlled, the construction difficulty is reduced.

[0015] 2. In this utility model, the safety and reliability of the entire bridge structure are improved by the mutual cooperation between the upper chord interlocking section, the lower chord interlocking section, the pre-embedded upper chord connecting section and its connecting plate, etc., thus providing a guarantee for the long-term performance and service life of the structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the closure arrangement of the crossbeam steel frame of the bridge tower crossbeam self-lifting steel truss beam closure construction system proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the temporary locking arrangement of the steel frame chord members in the closure construction system of the self-lifting steel truss beam bridge tower beam proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the temporary bracing of the butt joint of the bridge tower crossbeam self-lifting steel truss beam closure construction system proposed in this utility model.

[0019] Figure 4 This is a schematic diagram of the temporary locking of the slot in the upper chord of the bridge tower crossbeam self-lifting steel truss beam closure construction system proposed in this utility model.

[0020] Figure 5 This is a schematic diagram of the temporary bracing of the lower chord insertion section of the bridge tower crossbeam self-lifting steel truss beam closure construction system proposed in this utility model.

[0021] Legend:

[0022] 1. Tower column; 2. Upper chord butt joint; 3. Lifting jack; 4. Upper chord patch section; 5. Lower chord patch section; 6. Steel frame; 7. Secondary side girder; 8. Middle girder; 9. Plate; 10. Embedded chord connection section; 11. Steel frame chord; 12. Connecting plate; 13. Side girder; 14. Embedded upper chord connection section. Detailed Implementation

[0023] 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.

[0024] Reference Figures 1-3 This utility model provides an embodiment of a bridge tower crossbeam self-lifting steel truss beam closure construction system, including a tower column 1. A steel frame 6 is fixedly connected to the right end of the tower column 1. Two sets of the tower column 1 and its steel frame 6 are provided: one set on the left is fixed, and the other set on the right can be installed. Mounting plates 9 are detachably installed on both the upper and lower sides of the steel frame 6 via upper chord butt joints 2. During the closure of the self-lifting steel truss beam of the steel-concrete composite bridge tower crossbeam, the mounting plates 9 play a crucial temporary fixing role. A pre-embedded chord connecting section 10 is fixedly connected to the top of the steel frame 6, and a steel frame chord 11 is fixedly connected to the top of the pre-embedded chord connecting section 10. The pre-embedded chord connecting section 10 provides a stable connection foundation for the chord in the steel-concrete composite bridge tower crossbeam structure. Two sets of both the pre-embedded chord connecting section 10 and the steel frame chord 11 are provided, located above and below the steel frame 6 respectively. The top of the side is fixedly connected to the upper chord insert section 4, and the bottom right side of the steel frame 6 is fixedly connected to the lower chord insert section 5. Both the upper chord insert section 4 and the lower chord insert section 5 serve to facilitate connection. When the temperature changes and the material expands and contracts, the upper chord insert section 4 and the lower chord insert section 5 can be adjusted to adapt to the change. The top of the steel frame chord 11 is provided with a pre-embedded upper chord connecting section 14 through the connecting plate 12. Another set of steel frames 6 is provided on the right side of the pre-embedded upper chord connecting section 14. The installation of the two sets of steel frames 6 is achieved by installing the pre-embedded upper chord connecting section 14. The top of the steel frame chord 11 is fixedly connected to the side truss 13, the middle truss 8 and the secondary side truss 7 respectively. In the self-lifting steel truss beam structure of the steel-concrete composite bridge tower crossbeam, the side truss 13, the middle truss 8 and the secondary side truss 7 are the main load-bearing components. They jointly bear various loads from the bridge deck, including vehicle loads, self-weight, wind loads, etc.

[0025] Reference Figures 3-5 The left end of the connecting plate 12 is detachably installed on the inner wall of the steel frame chord 11 by bolts. The bolts provide a fixing function, and when the bolts are turned to release the limit, the connecting plate 12 can be moved to achieve the purpose of adjustment. The right end of the connecting plate 12 is fixedly connected to the outer wall of the pre-embedded upper chord connecting section 14. The two move along the same trajectory. There are two sets of steel frame 6. The distance between the steel frame chord 11 and the left end of the right side steel frame 6 is 1-2m. The 1-2m distance provides space for the subsequent adjustment of the connecting plate 12. The top of the steel frame 6 is equipped with a lifting jack 3, which can play a corresponding adjustment role.

[0026] Working principle: First, the left-side steel frame 6 and tower column 1 are fixed as the reference structure for subsequent closure operations. The right-side steel frame 6 can then be installed and adjusted. The pre-embedded chord connecting section 10 is pre-embedded in the designated position during the construction of tower column 1 and steel frame 6, and its top is fixedly connected to the steel frame chord 11. Before lifting, the right-side steel frame 6 is pre-biased to the right by 3cm using the three-way jacks at the bottom of the tower to pre-compensate for possible leftward displacement due to temperature changes, structural weight, etc., during the closure process. After the right-side steel frame 6 is lifted to the predetermined elevation, it is adjusted longitudinally and laterally using three 100t horizontal jacks of the upper adjustment system to achieve initial alignment. Three sets of 3t guide chains and two lifting jacks 3 are configured on the upper and lower chords of the steel frame 6. The guide chain tensioning is used to adjust the planar position of the steel frame 6 members. By applying tension or adjusting the direction of tension, the deviation of the members in the horizontal direction can be corrected. The jack plate lifting mechanism is used to adjust the elevation of the six members of the steel frame, precisely controlling the height of each member to achieve the required levelness and verticality.

[0027] The upper and lower sides of the steel frame 6 are fitted with mounting plates 9 via the upper chord butt joints 2. At this time, the mounting plates 9 serve as initial positioning and temporary fixation. Then, the lifting jacks 3 are installed to prepare for subsequent adjustments to the elevation and position of the steel frame 6. The mounting plates 9 are installed in the order of web plate-top plate-bottom plate. First, the left steel frame chord 11 is secured. Then, the right steel frame chord 11 is temporarily connected and locked and secured with the lower left steel frame chord 11. Next, the lower right lower chord insert section 5 is cut and secured with the tower column 1 and the lower right steel frame chord 11. The cutting is performed according to the measured groove size of the lower right chord insert section 5. The best window for operation is the early morning when the temperature is stable at 14℃-22℃ during the closure period (at this time, the temperature is relatively low and changes slowly, which is conducive to improving the cutting accuracy). After the technicians confirm the data, the cutting is performed when the error is ≤2mm to ensure the precise fit between the lower right chord insert section 5 and the tower column 1 and the lower chord.

[0028] The lower part of the right-side steel frame 6 is connected to the existing structure to further enhance the overall integrity of the structure. Then, the upper left steel frame chord 11 and the lower left steel frame chord 11 and their lower left chord joints are welded first, followed by the flange plate and then the web. Next, the lower right chord insert section 5 is welded to the tower column 1 and the lower right steel frame chord 11, following the order of middle truss 8 → secondary side truss 7 → side truss 13. Then, the upper right chord insert section 4 is cut and welded to the pre-embedded upper chord connecting section 14, and the upper right chord insert section 4 is welded to the upper chord. The welding order of the upper right chord insert section 4 is secondary side truss 7 → middle truss 8 → side truss 13. The middle truss 8 and side truss 13 are locked together. The connecting plate 12 is made of 20mm Q355C steel plate, with one end welded to the pre-embedded upper chord connecting section 14 and the other end bolted to the chord. The bolts are M30 high-strength bolts, and the bolt holes are 55mm×33mm oval holes. After the bolts are installed, they are in a relaxed state to accommodate the temperature shrinkage and expansion deformation of the steel frame 6. Throughout the welding process, through reasonable welding sequence and strict welding process control, the connection strength between each member and the overall structural stability are ensured to meet the design requirements.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bridge tower crossbeam self-lifting steel truss beam closure construction system, including tower columns (1), characterized in that: A steel frame (6) is fixedly connected to the right end of the tower column (1). The upper and lower sides of the steel frame (6) are detachably installed with a plate (9) through an upper chord butt joint (2). A pre-embedded chord connecting section (10) is fixedly connected to the top of the steel frame (6). A steel frame chord (11) is fixedly connected to the top of the pre-embedded chord connecting section (10). An upper chord insert section (4) is fixedly connected to the top right side of the steel frame (6). A lower chord insert section (5) is fixedly connected to the bottom right side of the steel frame (6). A pre-embedded upper chord connecting section (14) is provided at the top of the steel frame chord (11) through a connecting plate (12). A side girder (13), a middle girder (8), and a secondary side girder (7) are fixedly connected to the top of the steel frame chord (11).

2. The bridge tower crossbeam self-lifting steel truss beam closure construction system according to claim 1, characterized in that: The left end of the connecting plate (12) is detachably installed on the inner wall of the steel frame chord (11) by bolts, and the right end of the connecting plate (12) is fixedly connected to the outer wall of the pre-embedded upper chord connecting section (14).

3. The bridge tower crossbeam self-lifting steel truss beam closure construction system according to claim 1, characterized in that: The steel frame (6) is provided in two sets, and the steel frame chord (11) is spaced 1-2m apart from the left end of the steel frame (6) on the right side.

4. The bridge tower crossbeam self-lifting steel truss beam closure construction system according to claim 1, characterized in that: The top of the steel frame (6) is equipped with a lifting jack (3).

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