Lightweight steel box girder integral lifting cantilever frame body structure

Abstract

The utility model discloses a lightweight steel box girder overall lifting cantilever frame body structure which comprises a cantilever beam, the cantilever beam is longitudinally installed over a web of a steel box girder through a sleeper beam supporting pad, a sleeper beam comprises a front sleeper beam and a rear sleeper beam, the front sleeper beam is located below the front end of the cantilever beam and serves as a fulcrum of the cantilever beam, and the rear sleeper beam is located below the rear end of the cantilever beam and serves as a supporting point of the cantilever beam. The front sleeper beam is arranged above an end transverse rib of a cantilever section of the steel box beam, the rear sleeper beam is located below the rear end of the cantilever beam, a rear pressing beam is transversely installed above the rear end of the cantilever beam, an anchoring beam is installed below a bottom plate of the steel box beam under the rear pressing beam, and the rear pressing beam and the anchoring beam are connected in series and fixed through a finish rolling threaded steel anchor rod and an anchorage device. A lifting beam is transversely installed above the front end of the cantilever beam, a lifting cable penetrates through the lifting beam, the lifting cable at the top of the lifting beam is connected with a hydraulic lifting jack, and the lifting cable at the bottom of the lifting beam is connected with a lifting cable anchorage device. The lightweight steel box girder integral lifting cantilever frame body structure is low in construction cost and convenient to assemble and disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of steel box girder construction, in particular to a lightweight steel box girder integrally lifted cantilever frame structure. Background Art

[0002] With the continuous development of highway construction, prefabricated beams are widely used in the construction of bridge superstructures, and steel box beams are also widely used in interchange hub projects. In recent years, the overall lifting technology of steel box beams has gradually been applied to more and more bridge projects because of its advantages such as fast construction speed, low cost and convenient operation. In the past, the overall lifting technology mostly adopted floating crane lifting, large-tonnage crane lifting, diamond hanging basket frame lifting and other methods. The special equipment lifting method of floating crane lifting and large-tonnage crane lifting has the disadvantages of high rental costs, high requirements for site conditions at the construction site, and low work efficiency; and the use of diamond hanging baskets also has the problems of complex installation and disassembly and inconvenient operation. Therefore, it is necessary to design a new technology suitable for the overall lifting of steel box beams. Public literature also reports some technologies for the overall lifting of steel box beams, such as:

[0003] 1. Chinese Patent: A steel box girder bridge deck integral lifting structure and installation method, application number: 202311221262.6, application date: 2023.09.20, abstract: This application relates to a steel box girder bridge deck integral lifting structure and installation method, which includes at least two lifting modules, the lifting module includes a bridge pier, a bridge deck unit section and a lifting mechanism, the bridge deck unit section is fixed to the top of the bridge pier, the lifting mechanism includes a steel strand and a lifting cylinder for pulling the steel strand up, and the lifting cylinder is installed on the bridge deck unit section. This application can improve the convenience of building a steel box girder bridge deck in a shallow water navigation area and reduce the impact on the navigation conditions in the water area.

[0004] 2. Chinese Patent: A self-anchoring structure and method for overall lifting of a steel box girder, application number: 202311734307.X, application date: 2023.12.15, abstract: The invention discloses a self-anchoring structure for overall lifting of a steel box girder, comprising a bridge tower and a constructed steel box girder, the bridge tower is provided with an annular self-anchoring bracket body, the bottom of the bridge tower is provided with a bracket bottom embedded steel plate, the annular self-anchoring bracket body is connected with the bracket bottom embedded steel plate and the constructed steel box girder, the top of the constructed steel box girder is provided with a self-anchoring truss, and a lifting device is provided at one end of the self-anchoring truss facing the installation surface. The present invention also discloses a self-anchoring method for lifting a steel box girder as a whole, and the steps are as follows: 1. Pre-embed a steel plate at the bottom of a fixed bracket at the bottom of a bridge tower; 2. Install an annular self-anchoring bracket body; 3. In-situ hoist the prefabricated steel box girder, and weld adjacent prefabricated steel box girders to make them into constructed steel box girders; 4. Install the steel box girder inner support circular tube and self-anchoring truss on the constructed steel box girder; 5. Install the steel box girder to be hoisted. The present invention can economically and reasonably lift the steel box girder to a specified position, and can be widely used in the field of steel structure installation in building construction.

[0005] Through applied research, it was found that when the above-mentioned steel box girder overall lifting technology is applied to the overall lifting of the closed section of the lightweight steel box girder, the installation operation is relatively complicated, the number of high-altitude operations is large, and the installation and disassembly operations are not convenient enough. Summary of the invention

[0006] The utility model aims to provide a lightweight steel box girder integrally lifting cantilever frame structure, which has low construction cost and convenient installation and disassembly operation.

[0007] The utility model is realized by the following technical solutions:

[0008] A lightweight steel box girder integral lifting cantilever frame structure, comprising a cantilever beam, a bolster beam is transversely installed at the bottom of the cantilever beam, the cantilever beam is longitudinally installed just above the web of the steel box girder through a bolster support pad, the bolster beam serves as a distribution beam of the cantilever beam, and transfers the load of the cantilever beam to the steel box girder, the bolster beam comprises a front bolster beam and a rear bolster beam, the front bolster beam is located below the front end of the cantilever beam as a fulcrum of the cantilever beam, the front bolster beam is arranged above the end transverse rib of the cantilever section of the steel box girder, the rear bolster beam is located below the rear end of the cantilever beam, and the rear bolster beam is located at the A rear pressure beam is installed horizontally above the end, and an anchor beam is installed under the bottom plate of the steel box beam directly below the rear pressure beam. The rear pressure beam and the anchor beam are connected and fixed in series through fine-rolled threaded steel anchor rods and anchors. A lifting beam is installed horizontally above the front end of the cantilever beam, and a lifting rope is passed through the lifting beam. The lifting rope at the top of the lifting beam is connected and installed with a hydraulic lifting jack. The hydraulic lifting jack is installed on the top of the lifting beam to lift the lifting rope. The lifting rope anchor is installed at the bottom of the lifting beam. The lifting rope anchor prevents the lifting rope from sliding down. The top of the cantilever beam is set as an operating platform. The operating area is fully paved with customized galvanized pedals. The cantilever beam is used as a pedal support. Edge protection is set with steel pipes around the operating area. The upper and lower passages are made of steel pipe supports in the shape of a ladder for people to go up and down.

[0009] Further preferred: the bolster adopts a double-piece bolster I-beam structure, and a bolster stiffening plate is arranged at the position corresponding to the cantilever beam for reinforcement.

[0010] Further preferably, the cantilever beam is the main load-bearing member, the number of cantilever beams is four, and they are made of H-shaped steel, and stiffening plates are connected between the side plates on both sides of the H-shaped steel. To ensure the rigidity of the steel box beam, the anchor beam is arranged close to the cross diaphragm of the box beam. The anchor beam and the rear compression beam on the top surface of the steel box beam are kept in the same vertical section.

[0011] Further preferred: the rear compression beam or anchor beam adopts a double-piece I-beam structure, the spacing between the wing plates of the two I-beams is sufficient for the fine-rolled threaded steel anchor rod to pass through, and the upper and lower wing plates of the two I-beams are welded and connected by connecting plates.

[0012] Further preferred: the lifting beam adopts a double-jointed lifting beam I-beam structure, the spacing between the wing plates of the two lifting beam I-beams meets the requirement for the lifting cable to pass through, the lower wing plates of the two lifting beam I-beams adopt a lifting beam connecting plate as a connecting plate for full-length connection and reinforcement, and a mechanically opened circular hole is used in the center of the connecting plate corresponding to the position of the lifting cable for the lifting cable to pass through.

[0013] The cantilever frame structure for lifting the lightweight steel box girder as a whole has low construction cost and is easy to install and dismantle. Installing the cantilever frame structure for lifting the lightweight steel box girder as a whole on the web of the steel box girder can realize the overall lifting of the folded section of the lightweight steel box girder, overcoming the shortcomings of the methods of lifting by floating crane, lifting by large tonnage crane, lifting by diamond hanging basket frame, and the existing technology for lifting the steel box girder as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the connection structure of the lightweight steel box girder integral lifting cantilever frame structure;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the overall lifting cantilever frame structure of the lightweight steel box girder;

[0016] Figure 3 It is a structural schematic diagram of the rear compression beam and the anchor beam;

[0017] Figure 4 It is a schematic diagram of the cross-section connection structure of the rear compression beam;

[0018] Figure 5 It is a schematic diagram of the structure of a cantilever beam;

[0019] Figure 6 It is a schematic diagram of the connection structure of the lifting beam;

[0020] Figure 7 It is a structural diagram of the bolster;

[0021] The names corresponding to the numbers in the figure are:

[0022] 1. Lifting cable, 2. Cantilever beam, 3. Lifting beam, 4. Hydraulic lifting jack, 5. Front pillow beam, 6. Rear pillow beam, 7. Rear pressure beam, 8. Finished rolled threaded steel anchor rod, 9. Steel box beam, 10. Anchor beam, 11. Anchor, 12. Connecting plate, 13. I-beam, 14. H-beam, 15. Stiffening plate, 16. Lifting beam connecting plate, 17. Lifting beam I-beam, 18. Lifting cable anchor, 19. Pillow beam I-beam, 20. Pillow beam stiffening plate. DETAILED DESCRIPTION

[0023] In order to describe the present technology more clearly, the present technology is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0024] A lightweight steel box girder integral lifting cantilever frame structure, which includes a cantilever beam 2, a bolster is transversely installed at the bottom of the cantilever beam 2, the cantilever beam 2 is longitudinally installed just above the web of the steel box girder 9 through the bolster support pad, the bolster serves as a distribution beam of the cantilever beam 2, and transfers the load of the cantilever beam 2 to the steel box girder 9, the bolster includes a front bolster beam 5 and a rear bolster beam 6, the front bolster beam 5 is located below the front end of the cantilever beam 2 as a fulcrum of the cantilever beam 2, the front bolster beam 5 is arranged above the end transverse rib of the cantilever section of the steel box girder 9, and the rear bolster beam 6 is located at A rear pressure beam 7 is installed horizontally above the rear end of the cantilever beam 2, and an anchor beam 10 is installed below the bottom plate of the steel box beam 9 directly below the rear pressure beam 7. The rear pressure beam 7 and the anchor beam 10 are connected and fixed in series by a fine-rolled threaded steel anchor rod 8 and an anchor 11. A lifting beam 3 is installed horizontally above the front end of the cantilever beam 2. A lifting cable 1 is passed through the lifting beam 3. The lifting cable 1 at the top of the lifting beam 3 is connected and installed with a hydraulic lifting jack 4, and the lifting cable anchor 18 is connected and installed at the bottom of the lifting beam 3. The top of the cantilever beam is set as an operating platform, and a fully paved customized galvanized pedal is used in the operating area. The cantilever beam is used as a pedal support, and edge protection is set with steel pipes around the operating area. The upper and lower passages are made of steel pipe supports in the shape of a ladder for people to go up and down.

[0025] The bolster adopts a double-jointed bolster I-beam 19 structure, and a bolster stiffening plate 20 is arranged at the position corresponding to the cantilever beam 2 for reinforcement.

[0026] The cantilever beam 2 is the main load-bearing member. There are four cantilever beams 2, which are made of H-shaped steel 14. Stiffening plates 15 are connected between the side plates on both sides of the H-shaped steel 14. To ensure the rigidity of the steel box beam, the anchor beam is arranged close to the cross diaphragm of the box beam. The anchor beam and the rear compression beam on the top surface of the steel box beam are kept in the same vertical section.

[0027] The rear compression beam 7 or anchor beam 10 adopts a double-jointed I-beam 13 structure. The spacing between the wing plates of the two I-beams 13 is sufficient for the fine-rolled threaded steel anchor rod 8 to pass through. The upper and lower wing plates of the two I-beams 13 are welded and connected using a connecting plate 12.

[0028] The lifting beam 3 adopts a double-jointed lifting beam I-beam 17 structure. The spacing between the wing plates of the two lifting beam I-beams 17 is sufficient for the lifting cable 1 to pass through. The lower wing plates of the two lifting beam I-beams 17 adopt a lifting beam connecting plate 16 as a connecting plate for full-length connection and reinforcement. A mechanical circular hole is used in the center of the connecting plate corresponding to the position of the lifting cable 1 for the lifting cable 1 to pass through.

[0029] The design and construction process of this lightweight steel box girder integral lifting cantilever frame structure is as follows: according to the design dimensions, all structural components are processed and transported to the construction site for installation; first, the bolster is installed, and the position of the bolster on the top surface of the steel box girder is accurately laid out and the contour line is marked according to the design position in the drawing, and the bolster is placed within the contour line by a crane. The cantilever beam is installed, and the cantilever beam is also placed in place by a crane according to the design position, and the contact position is spot welded and fixed. After the cantilever beam is installed, the rear pressure beam and anchor beam are installed. First, the rear pressure beam is placed on the cantilever beam by a crane, and then the anchor beam is fixed directly below the rear pressure beam. The fine-rolled threaded steel anchor rod is pierced, and the anchor pad and anchor clamp are set at the bottom of the anchor beam below. Then, the fine-rolled threaded steel above the rear pressure beam is tensioned by a jack, and anchoring is performed after the tensioning is completed; the working platform and lifting beam are installed, and the working platform is gradually set up from the pier top section to the cantilever section. First, the galvanized pedal is fully laid in the working area near the pier top, and then the steel pipe guardrail is set up; then the lifting beam is positioned and placed. After the installation of the working platform and lifting beam, the lifting device is finally installed, and the hydraulic lifting jack is hoisted above the lifting beam and fixed; finally, the overall lifting construction of the steel box beam is carried out. After the entire bridge is closed, it can be dismantled in the order of lifting beam, working platform, rear pressure beam and rear anchor beam, cantilever beam, and pillow beam, and hoisted to the ground by a crane.

[0030] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present application should fall within the scope of protection of the present application.

Claims

1. A lightweight steel box girder integral lifting cantilever frame structure, characterized in that: The invention comprises a cantilever beam (2), wherein a bolster is transversely installed at the bottom of the cantilever beam (2), the cantilever beam (2) is longitudinally installed just above the web of the steel box beam (9) through a bolster support pad, the bolster comprises a front bolster beam (5) and a rear bolster beam (6), the front bolster beam (5) is located below the front end of the cantilever beam (2) as a fulcrum of the cantilever beam (2), the front bolster beam (5) is arranged above the end transverse rib of the cantilever section of the steel box beam (9), the rear bolster beam (6) is located below the rear end of the cantilever beam (2), and a rear pressure beam (7) is transversely installed above the rear end of the cantilever beam (2) ), an anchor beam (10) is installed under the bottom plate of the steel box beam (9) directly below the rear pressure beam (7), the rear pressure beam (7) and the anchor beam (10) are connected and fixed in series by a precision-rolled threaded steel anchor rod (8) and an anchor (11), a lifting beam (3) is installed horizontally above the front end of the cantilever beam (2), a lifting cable (1) is passed through the lifting beam (3), the lifting cable (1) at the top of the lifting beam (3) is connected and installed with a hydraulic lifting jack (4), and the lifting cable (1) at the bottom of the lifting beam (3) is connected and installed with a lifting cable anchor (18).

2. The lightweight steel box girder integral lifting cantilever frame structure according to claim 1 is characterized in that: The bolster adopts a double-jointed bolster I-beam (19) structure, and a bolster stiffening plate (20) is arranged at the position corresponding to the cantilever beam (2) for reinforcement.

3. The lightweight steel box girder integral lifting cantilever frame structure according to claim 1 or 2, characterized in that: The cantilever beams (2) are four in number and are made of H-shaped steel (14). Stiffening plates (15) are connected between the side plates on both sides of the H-shaped steel (14).

4. The lightweight steel box girder integral lifting cantilever frame structure according to claim 1 is characterized in that: The rear compression beam (7) or anchor beam (10) adopts a double-jointed I-beam (13) structure, the spacing between the wing plates of the two I-beams (13) is sufficient for the fine-rolled threaded steel anchor rod (8) to pass through, and the upper and lower wing plates of the two I-beams (13) are welded and connected using a connecting plate (12).

5. The lightweight steel box girder integral lifting cantilever frame structure according to claim 1 is characterized in that: The lifting beam (3) adopts a double lifting beam I-beam (17) structure, the spacing between the wing plates of the two lifting beam I-beams (17) is sufficient for the lifting cable (1) to pass through, the lower wing plates of the two lifting beam I-beams (17) adopt a lifting beam connecting plate (16) as a gusset plate to connect and reinforce the entire length, and a circular hole for the lifting cable (1) to pass through is opened in the center of the gusset plate corresponding to the position of the lifting cable (1).

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