A whole vertical lifting rigid locking device for arch ribs in a basket type steel box arch bridge

Abstract

The utility model discloses a basket type steel box arch bridge in arch rib integral vertical hoist rigid locking device belongs to basket type steel box arch bridge construction technical field, including arch rib support, vertical hoist system, horizontal rigid locking structure and longitudinal rigid locking structure, arch rib support sets up on the concrete bridge deck for assembling the segment of arch rib and forms the predetermined linear shape posture and camber, vertical hoist system is used for vertical integral hoist arch rib, horizontal rigid locking structure includes horizontal counter pull tendon, horizontal inner bracing and horizontal inner bracing base, and horizontal counter pull tendon both ends are fixedly connected with the both ends of arch rib respectively, and horizontal inner bracing both sides are connected to the inboard of arch rib through horizontal inner bracing base and are used for supporting arch rib, longitudinal rigid locking structure includes longitudinal counter pull tendon and longitudinal counter pull tendon base, and longitudinal counter pull tendon both ends are connected to the both sides of arch rib, and longitudinal counter pull tendon base is used for connecting longitudinal counter pull tendon and arch rib, the utility model has the advantages of stable and efficient and low in cost.

Description

Technical Field

[0001] This utility model belongs to the field of construction technology of basket-type steel box arch bridges, and more specifically relates to a rigid locking device for the overall vertical lifting of the arch ribs in a basket-type steel box arch bridge. Background Technology

[0002] Long-span basket-type steel box arch bridges typically span deep valleys, rivers, important urban areas, or adjacent to existing railway lines. Their construction not only affects the bridge's own quality and safety but can also have a significant impact on the surrounding environment. For large-span basket-type steel box arch bridges with a beam-then-arch construction method, traditional construction methods such as the scaffolding method, incremental launching method, and rotation method have many shortcomings in terms of construction efficiency, economy, and environmental impact. The construction technology of assembling the central arch rib at a low position and then vertically lifting it as a whole, as an emerging construction method, has advantages such as fast construction speed, minimal environmental impact, high construction precision, and safety and reliability. The key technologies, namely the rigid locking of the central arch rib before overall lifting after low-position assembly and the design and construction of the lifting structure, are urgently needed solutions. Utility Model Content

[0003] In view of this, the present invention provides a rigid locking device for the overall vertical lifting of the central arch rib of a basket-type steel box arch bridge. It aims to solve the problem of how to ensure that the overall strength, stiffness and stability of the central arch rib meets the specifications under the conditions of self-weight and wind load during the overall lifting process after the central arch rib of a large-span basket-type steel box arch bridge has passed the low-level assembly and acceptance, so as to achieve complete, stable and continuous lifting.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A rigid locking device for the vertical lifting of the central arch rib of a basket-type steel box girder bridge includes a central arch rib support, a vertical lifting system, a transverse rigid locking structure, and a longitudinal rigid locking structure. The central arch rib support is installed on the completed concrete bridge deck and is used for pre-assembling the segments of the central arch rib to form a predetermined linear posture and camber. The vertical lifting system is used for vertically lifting the central arch rib as a whole. The transverse rigid locking structure includes transverse tie rods, transverse inner struts, and transverse inner strut bases. The two ends of the transverse tie rods are fixedly connected to the two ends of the central arch rib. The two sides of the transverse inner struts are connected to the inner sides of the central arch rib through the transverse inner strut bases to support the central arch rib. The longitudinal rigid locking structure includes longitudinal tie rods and longitudinal tie rod bases. The two ends of the longitudinal tie rods are connected to the two sides of the central arch rib. The longitudinal tie rod bases are used to connect the longitudinal tie rods to the central arch rib.

[0006] Furthermore, the column base of the central arch rib support is fixedly connected to the concrete bridge deck through pre-embedded steel plates.

[0007] Furthermore, the vertical lifting system includes two sets of lifting supports, a hydraulic synchronous lifting system, lifting cables, and a vertical lifting base; the two sets of lifting supports are respectively erected on both sides of the central arch rib, and the two sets of lifting supports are fixedly connected by a lifting top plate, and the hydraulic synchronous lifting system is fixed to the lifting top plate; four sets of vertical lifting bases and lifting cables are symmetrically arranged along the center of the central arch rib; the vertical lifting base is welded to the central arch rib; one end of the lifting cable is connected to the hydraulic synchronous lifting system, and the other end is connected to the vertical lifting base.

[0008] Furthermore, both the transverse tie rods and the transverse inner struts are provided in two sets, which are fixedly connected to the upper and lower sides of the central arch rib respectively. Each set contains two struts, which are symmetrically arranged with respect to the central axis of the arch bridge. There are eight transverse inner strut bases, all of which are welded to the central arch rib.

[0009] Furthermore, the longitudinal tie rods are provided in two sets, with two rods in each set, respectively located on the upper and lower parts of the side of the central arch rib; the base of the longitudinal tie rods is welded to both sides of the central arch rib.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. Lowering the grade of adjacent operating lines: If the line under construction is parallel to the existing operating line, and the traditional in-situ support method is used, the support height is high. If it overturns, it will enter the railway operating clearance, resulting in a high construction grade. By adopting the current technology, the support height is reduced, thus lowering the grade of adjacent operating lines and greatly reducing safety.

[0012] 2. Improved construction efficiency: During the construction process, interference from construction on adjacent operating lines was reduced, the construction period was shortened, and construction efficiency was improved.

[0013] 3. Cost reduction: The height of the central arch rib assembly support is reduced by 20 meters, the amount of assembly support work is reduced, the hoisting height of the central arch rib is reduced, the corresponding arch rib segment hoisting equipment model is reduced, and the temporary facility costs and machinery costs are reduced accordingly.

[0014] 4. Reasonable structural design: The longitudinal, transverse and vertical three-way cable structure is reasonably designed. In order to ensure the strength of the arch rib during the lifting process, when the central arch rib is manufactured in the factory, partitions and temporary bases are added inside and outside the central arch rib to ensure the safety of the arch rib structure and the lifting safety when rigidly locked. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the central arch rib of this utility model.

[0018] In the figure:

[0019] 1-Lifting bracket; 2-Hydraulic synchronous lifting system; 3-Vertical lifting base; 4-Longitudinal tie rod; 5-Longitudinal tie rod base; 6-Transverse inner support rod; 7-Transverse inner support rod base; 8-Transverse tie rod; 9-Central arch rib. Detailed Implementation

[0020] 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.

[0021] Please see the appendix Figure 1-2 This utility model addresses the construction of large-span basket-type steel box arch bridges using the "beam-beam-then-arch" method, and provides an integral vertical lifting rigid locking device for the central arch rib of the basket-type steel box arch bridge. The device includes a central arch rib support, a vertical lifting system, a transverse rigid locking structure, and a longitudinal rigid locking structure.

[0022] The central arch rib support is installed on the completed concrete bridge deck and is used to pre-assemble the nine segments of the central arch rib to form a predetermined linear shape and arch. The column bases of the central arch rib support are fixedly connected to the concrete bridge deck through pre-embedded steel plates.

[0023] The vertical lifting system is used for vertically lifting the central arch rib 9.

[0024] The vertical lifting system includes two sets of lifting supports 1, a hydraulic synchronous lifting system 2, lifting cables, and a vertical lifting base 3. The two sets of lifting supports 1 are respectively erected on both sides of the central arch rib 9, and are fixedly connected by a lifting top plate. The hydraulic synchronous lifting system 2 is fixed to the lifting top plate. Four sets of vertical lifting bases 3 and lifting cables are symmetrically arranged along the center of the central arch rib 9. The vertical lifting base 3 is welded to the central arch rib 9. One end of each lifting cable is connected to the hydraulic synchronous lifting system 2, and the other end is connected to the vertical lifting base 3. A total of four lifting points are set on the central arch rib 9, and the hydraulic synchronous lifting system uses the lifting cables to lift the central arch rib 9 as a whole.

[0025] The transverse rigid locking structure includes transverse tie rods 8, transverse inner struts 6, and transverse inner strut bases 7. Two sets of transverse tie rods 8 and transverse inner struts 6 are provided, fixedly connected to the upper and lower sides of the central arch rib 9, respectively. Each set contains two struts, symmetrically arranged relative to the central axis of the arch bridge, for a total of eight connection points. The two ends of the transverse tie rods 8 are fixedly connected to the two ends of the central arch rib 9. The two sides of the transverse inner struts 6 are connected to the inner side of the central arch rib 9 via the transverse inner strut bases 7, serving to support the central arch rib 9. Eight transverse inner strut bases 7 are provided, all welded to the central arch rib 9. The steel material of the transverse inner strut bases is the same as that of the central arch rib 9. The transverse tie rods 8 and transverse inner struts 6 connect the segments of the central arch rib 9, forming a certain transverse tension.

[0026] The longitudinal rigid locking structure includes longitudinal tie rods 4 and longitudinal tie rod bases 5. Two sets of longitudinal tie rods 4 are provided, one on each side of the central arch rib 9. Each set consists of two rods, located at the upper and lower parts of the side of the central arch rib 9. The longitudinal tie rod bases 5 are welded to both sides of the central arch rib 9, connecting the longitudinal tie rods 4 to the central arch rib 9. A total of eight bases 5 are provided, and their material is the same as that of the central arch rib 9. The longitudinal tie rods 4 connect each segment of the central arch rib 9, and longitudinal tension is applied to the longitudinal tie rods step by step until the linear orientation, stress, and tension of the central arch rib meet the specifications.

[0027] The construction method of the above-mentioned device includes the following steps:

[0028] S1: Installation of one-side lifting bracket 1: After the installation of one side arch rib is completed, use a crane to install one-side lifting bracket 1 and hydraulic synchronous lifting system 2.

[0029] S2: Installation of Central Arch Rib 9: On the concrete beam surface, influenced by the crane station position, the central arch rib support and each segment of the central arch rib are installed sequentially. The column base of the central arch rib support is fixed to the concrete beam body through pre-embedded steel plates. To control the horizontal thrust generated during the assembly of central arch rib 9, after each segment of central arch rib 9 is assembled, it is firmly connected to the concrete bridge deck through rigid connections. The rigid constraints are released before vertical lifting.

[0030] S3: Installation of the other side lifting bracket 1: After the central arch rib 9 is installed, use a crane to install the other side lifting bracket 1 and the hydraulic synchronous lifting system 2.

[0031] S4: Lateral Rigid Locking of Central Arch Rib 9: After the central arch rib 9 is installed, the two ends are temporarily and rigidly locked laterally. Lateral tie rods 8 and lateral inner struts 6 are installed on the central arch rib 9. The lateral tie rods 8 and the bases 7 of the lateral inner struts are manufactured simultaneously with the central arch rib 9, fully penetratedly welded to the central arch rib 9, and the weld is inspected for defects. Before the overall lifting of the central arch rib, the connection of the lateral tie rods and inner struts is completed, and a certain lateral tie cable force is set.

[0032] S5: Longitudinal Rigid Locking of Central Arch Rib 9: After the central arch rib 9 is installed, it is temporarily locked longitudinally; longitudinal tie rods 4 are installed on the central arch rib 9. The longitudinal tie rod base 5 is manufactured simultaneously with the central arch rib 9, and is fully penetrated welded to the central arch rib 9 and subjected to weld flaw detection. Before the central arch rib 9 is lifted as a whole, the connection of the longitudinal tie rod is completed, and the cable force is applied to the longitudinal tie rod 4 alternately with the lifting cable until the linear posture, stress, and cable force of the central arch rib 9 meet the specification requirements.

[0033] S6: Vertical Rigid Locking of Central Arch Rib 9: After the central arch rib 9 is installed, it is temporarily locked vertically; a vertical lifting system is installed, with four lifting points set on the central arch rib 9. Before the central arch rib 9 is lifted as a whole, the lifting cables are installed, and vertical cable forces are applied to the lifting cables step by step until the linear posture, stress, and cable force of the central arch rib 9 meet the specifications.

[0034] S7: 9-stage loading of the central arch rib: When rigidly locked, first pre-tighten the lifting cable and complete the lateral tensioning, then apply the vertical lifting cable force first and then the longitudinal cable force in stages. Each time, the loading is carried out in four stages at 25% of the design cable force, and the assembly support constraint is released simultaneously from both ends to the middle of the span.

[0035] S8: Trial lifting of central arch rib 9: The trial lifting height is approximately 1.5m, and real-time data are collected on the arch rib stress and strain, deformation detection of the lifting support, stress detection of the concrete beam surface, and the synchronization of the four points of the lifting system. After the trial lifting is completed, the longitudinal tension cables will be protected to prevent damage when dismantling the assembly support and the interference members of the tension cable lifting.

[0036] S9: Central Arch Rib 9 is officially lifted: The lifting of the central arch rib 9 adopts a hydraulic synchronous lifting system, which lifts in 300mm increments. After each 6 increments, the posture of the steel arch rib is monitored and measured. If the four lifting points are not synchronized, the hydraulic pump station will automatically adjust to manual adjustment to complete the single-point arch rib adjustment.

[0037] S10: Closure of the central arch rib 9 and the side arch rib: The closure section construction adopts a dynamic adaptation process. A closure section with a vertical arch axis cut is set between the overall vertical lifting section of the central arch rib 9 and the in-situ assembly section of the side arch rib. There are a total of four closure sections in the whole bridge.

[0038] S11: Tensioning of longitudinal, transverse and vertical cables of central arch rib 9: After the closure section is installed and welded and passes the flaw detection test, the system conversion is completed. First, the constraints of the central arch rib 9 assembly section are released, and then the central arch rib 9 is tensioned in reverse order. The horizontal cable force and the lifting cable force are tensioned synchronously in stages at 25%. The horizontal cables are tensioned in an orderly, symmetrical and uniform manner, strictly following the tensioning sequence of upper inner side → upper outer side → lower inner side → lower outer side.

[0039] S12: Removal of auxiliary facilities: After the arch rib system conversion is completed, remove the central arch rib support and the horizontal inner strut base 7, the longitudinal tie rod base 5, and the vertical lifting base 3. After the weld seams are ground and sprayed with anti-rust paint, complete the coating that is consistent with the arch rib.

[0040] Before the overall lifting, this invention achieves rigid locking in the longitudinal, transverse, and vertical directions, treating the central arch rib 9 as a single component. Its strength, stiffness, and stability all meet the specifications. The linear posture, stress detection, and camber of the central arch rib 9 all meet the requirements. During the trial lifting phase, the lifting speed, four-point synchronization, and stress monitoring of the arch rib all comply with the specifications. During the lifting process, the positions of the transverse tie rods 8, transverse inner struts 6, longitudinal tie rods 4, and vertical lifting base 3 are reasonably positioned, their connection points with the central arch rib 6 are reasonable, the longitudinal, transverse, and vertical cable structure design is reasonable, and the sequential loading is reasonable. During the lifting process, the longitudinal, transverse, and vertical cable forces do not interfere with the central arch rib 9, ensuring a smooth, safe, and controlled lifting process.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rigid locking device for the overall vertical lifting of the arch ribs in a basket-type steel box girder arch bridge, characterized in that, It includes a central arch rib support, a vertical lifting system, a transverse rigid locking structure, and a longitudinal rigid locking structure; The central arch rib support is set on the completed concrete bridge deck and is used to pre-assemble the segments of the central arch rib (9) to form a predetermined linear posture and arch; the vertical lifting system is used to vertically lift the central arch rib (9) as a whole. The transverse rigid locking structure includes a transverse tie rod (8), a transverse inner support rod (6), and a transverse inner support rod base (7); the two ends of the transverse tie rod (8) are respectively fixedly connected to the two ends of the central arch rib (9); the two sides of the transverse inner support rod (6) are connected to the inner side of the central arch rib (9) through the transverse inner support rod base (7) to support the central arch rib (9). The longitudinal rigid locking structure includes a longitudinal tie rod (4) and a longitudinal tie rod base (5); the two ends of the longitudinal tie rod (4) are connected to the two sides of the central arch rib (9); the longitudinal tie rod base (5) is used to connect the longitudinal tie rod (4) and the central arch rib (9).

2. The rigid locking device for the overall vertical lifting of the arch rib in a basket-type steel box girder arch bridge according to claim 1, characterized in that, The column base of the central arch rib support is fixedly connected to the concrete bridge deck through pre-embedded steel plates.

3. The rigid locking device for the overall vertical lifting of the arch rib in a basket-type steel box girder arch bridge according to claim 1, characterized in that, The vertical lifting system includes two sets of lifting supports (1), a hydraulic synchronous lifting system (2), lifting cables, and a vertical lifting base (3). The two sets of lifting supports (1) are respectively erected on both sides of the central arch rib (9), and the two sets of lifting supports (1) are fixedly connected by a lifting top plate. The hydraulic synchronous lifting system (2) is fixed to the lifting top plate. The vertical lifting base (3) and the lifting cables are symmetrically arranged in four sets along the center of the central arch rib (9). The vertical lifting base (3) is welded to the central arch rib (9). One end of the lifting cable is connected to the hydraulic synchronous lifting system (2), and the other end is connected to the vertical lifting base (3).

4. The rigid locking device for the overall vertical lifting of the arch rib in a basket-type steel box girder arch bridge according to claim 1, characterized in that, The transverse tie rods (8) and the transverse inner struts (6) are each provided in two sets, which are fixedly connected to the upper and lower sides of the central arch rib (9) respectively. Each set contains two struts, which are symmetrically arranged relative to the central axis of the arch bridge. The transverse inner strut bases (7) are provided in eight sets, all of which are welded to the central arch rib (9).

5. The rigid locking device for the overall vertical lifting of the arch rib in a basket-type steel box girder arch bridge according to claim 1, characterized in that, The longitudinal tie rods (4) are provided in two sets, each set having two rods, which are respectively located on the upper and lower parts of the side of the central arch rib (9); the longitudinal tie rod base (5) is welded to both sides of the central arch rib (9).

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