A steel box girder cantilever installation device

Abstract

This utility model relates to the field of building bridge technology and discloses a steel box girder cantilever installation device, comprising: a support assembly including a cantilever beam, diagonal braces, and uprights; a lifting assembly fixedly connected to the cantilever beam, including a lifting section and a hoisting section; and a connecting assembly adapted to connect and fix the steel box girder and the cantilever arm or adjacent cantilever arms. Through the synergistic action of the support assembly, lifting assembly, and connecting assembly, efficient installation of the steel box girder cantilever arm is achieved. The cantilever beam, diagonal braces, and uprights in the support assembly form a stable triangular support structure, effectively bearing the weight of the cantilever arm and distributing dynamic loads during construction, ensuring the stability of the installation process. The lifting assembly adopts a modular design, which can be flexibly adjusted according to different cantilever arm sizes and weights. The connecting assembly adopts a high-strength connection method to ensure rigid fixation between the cantilever arm and the steel box girder or adjacent cantilever arms.

Description

Technical Field

[0001] This utility model relates to the field of building bridge technology, specifically to a steel box girder cantilever installation device. Background Technology

[0002] With the rapid improvement of urban economic levels in my country and people's increasing demands for quality of life and travel, municipal bridge construction has developed rapidly in order to improve travel efficiency and reduce traffic congestion. Steel box girders, due to their superior mechanical properties, are widely used in complex environments such as crossing intersections, highways, and seas. A steel box girder mainly consists of a main box chamber, steel cantilever arms, and steel guardrails. The main installation method is as follows: first, a temporary lattice support frame is erected under the main box chamber for installation; then, a truck crane is used to hoist the steel cantilever arms, steel guardrails, and other components into place.

[0003] A steel box girder cantilever refers to the cantilevered portion extending laterally to both sides of the main structure of a steel box girder. It is typically used to widen the bridge deck or support ancillary facilities such as sidewalks and guardrails. It is constructed from welded steel plates into a box-shaped cross-section, possessing high bending and torsional stiffness, and rigidly connected to the main girder to form an integrated load-bearing system. The cantilever design requires comprehensive consideration of load distribution, structural lightweighting, and aesthetics. It is commonly found in long-span bridges or urban interchange projects, effectively improving bridge functionality and space utilization. However, in related technologies, the use of truck cranes for steel cantilever hoisting requires prior road closure, places high demands on ground conditions, and significantly impacts traffic. Utility Model Content

[0004] In view of this, the present invention provides a steel box girder cantilever installation device to solve the problem that the hoisting and positioning of steel box girder cantilever arms are greatly affected by the site in the prior art.

[0005] This utility model provides a cantilever installation device for steel box girders, which is fixedly connected to the steel box girder, including:

[0006] The support components include cantilever beams, diagonal braces, and uprights. One end of each upright, diagonal brace, and cantilever beam is connected to the other, and the other end is fixedly connected to the steel box girder.

[0007] The lifting assembly is fixedly connected to the cantilever beam and includes a lifting part and a hoisting part. The lifting part is fixedly connected to the cantilever beam, and the lifting part, hoisting part and cantilever arm are hoisted and connected sequentially from top to bottom.

[0008] Connection assembly, suitable for connecting and fixing steel box girder and cantilever or adjacent cantilever.

[0009] Beneficial Effects: The synergistic action of the support components, lifting components, and connecting components enables efficient installation of the steel box girder cantilever. The cantilever beams, diagonal braces, and uprights in the support components form a stable triangular support structure, effectively bearing the weight of the cantilever and distributing dynamic loads during construction, ensuring stability during installation. The lifting components adopt a modular design, allowing for flexible adjustment according to different cantilever sizes and weights, improving lifting accuracy, reducing manual intervention, and lowering construction risks. The connecting components employ high-strength connections to ensure rigid fixation between the cantilever and the steel box girder or adjacent cantilever, preventing loosening due to vibration or wind loads, and improving the overall structural durability and safety. The elimination of the need for pre-closure of roads using truck cranes reduces requirements on ground conditions. The device's simple structure and convenient installation make it suitable for various construction scenarios, including bridges and buildings, significantly improving construction efficiency and reducing project costs.

[0010] In one alternative embodiment, the upright includes an upright body and a fixing member, the fixing member being adapted to pass through the upright body to fix the upright to the steel box girder.

[0011] Beneficial effects: The combined design of the upright body and fasteners enables a quick and stable connection between the uprights and the steel box girder. The fasteners, using a through-type fixing method, not only enhance the tensile and compressive strength of the uprights but also effectively prevent slippage or tilting under stress, improving the overall stability of the support structure. Simultaneously, it facilitates disassembly and reuse, reducing construction costs. It also improves the versatility and adaptability of the device.

[0012] In one alternative embodiment, the support assembly further includes a diagonal brace, one end of which is disposed on the cantilever beam and the other end of which is disposed on the upright.

[0013] Beneficial effects: The addition of diagonal braces further optimizes the stress performance of the support components, forming a more stable space truss structure. Diagonal braces effectively distribute the loads of the cantilever beams and uprights, reducing deflection at the cantilever ends and preventing deformation or fracture caused by localized stress concentration. They also improve the load-bearing capacity and wind-induced vibration resistance of the installation, ensuring the safety and reliability of the construction process.

[0014] In one alternative embodiment, the lifting unit includes a transmission unit, a sling, and a hook, wherein the transmission unit is connected to the hook via the sling.

[0015] Beneficial effects: The combination of the transmission unit, slings, and hooks enables smooth lifting of the boom. The transmission unit can be electrically or hydraulically driven, providing stable lifting power to accommodate booms of varying weights. The slings, made of high-strength steel wire rope or synthetic fiber rope, possess excellent tensile strength and flexibility, effectively buffering impact loads during lifting. The hooks feature a self-locking or anti-detachment design, ensuring the boom will not accidentally detach during lifting, thus improving construction safety.

[0016] In one alternative embodiment, the hoisting unit includes: a cable, a frame beam, and a lifting lug. One end of the cable is connected to a hook, and the other end is connected to the lifting lug, which is fixedly mounted on the frame beam.

[0017] Beneficial effects: The coordinated action of cables, frame beams, and lifting lugs enables balanced lifting of the cantilever boom. The lifting lugs are made of high-strength steel and optimized for secure and reliable connection with the cables. This lifting mechanism is particularly suitable for installing large or irregularly shaped cantilever booms, effectively improving lifting accuracy, reducing installation errors, and ensuring the quality of the docking after the boom is in place.

[0018] In one alternative implementation, the frame beam is a quadrilateral structure, with cables crisscrossing and connecting to the four corners of the frame beam.

[0019] Beneficial effects: The quadrilateral structure of the frame beams ensures even distribution of lifting loads, preventing the cantilever arms from tilting or twisting during hoisting. The cross-connection of the cables enhances the stability of the frame beams and prevents deformation during hoisting.

[0020] In one optional embodiment, the connecting assembly includes a fixed seat and a connecting rod. When the steel box girder is fixedly connected to the cantilever arm, one end of the connecting rod is fixedly connected to the fixed seat, and the other end is connected to the upright. The fixed seat is fixedly installed to the cantilever arm.

[0021] Beneficial effects: The combination of fixed seats and connecting rods achieves a high-strength connection between the steel box girder and the cantilever arm. The fixed seats are secured by welding or bolting to ensure a firm bond with the cantilever arm. One end of the connecting rod connects to the fixed seat, and the other end connects to the upright, forming a stable force transmission path that effectively distributes the load on the cantilever arm and prevents excessive local stress on the steel box girder. This connection method not only improves the installation accuracy of the cantilever arm but also enhances the overall structure's resistance to wind vibration and fatigue.

[0022] In one alternative implementation, when the connecting assembly is fixedly connected to adjacent cantilever arms, both ends of the connecting rod are respectively fixedly connected to fixed seats, and the fixed seats are respectively fixedly installed to adjacent cantilever arms.

[0023] Beneficial effects: Rigid connection is achieved through fixed seats and connecting rods, ensuring uniform load transfer among multiple cantilever arm segments. Both ends of the connecting rod are fixed to the fixed seats of adjacent cantilever arms, forming a continuous integral structure that effectively prevents relative displacement or misalignment between the cantilever arms. Suitable for the installation of continuous cantilever arms, it can improve the overall rigidity and stability of the structure and extend its service life.

[0024] In one alternative implementation, the support assembly is further provided with reinforcing plates on the columns and cantilever beams.

[0025] Beneficial effects: By adding a reinforcing plate between the column and the cantilever beam, the rigidity and strength of the support assembly are further improved. The reinforcing plate is made of high-strength steel and is fixed by welding or bolting, effectively enhancing the bending and shear resistance of key nodes and preventing fatigue cracking after long-term use.

[0026] In one optional embodiment, the number of steel box girder cantilever installation devices is multiple, with multiple cantilever arms fixedly installed on both sides of the steel box girder.

[0027] Beneficial effects: By setting up multiple steel box girder cantilever installation devices, the synchronous and symmetrical installation of the cantilever arms on both sides of the steel box girder can be achieved. The coordinated operation of multiple devices significantly improves construction efficiency and shortens the construction period. At the same time, the symmetrical installation method ensures balanced stress on the steel box girder, avoiding skewing or twisting caused by excessive load on one side, thus improving the overall structural stability and safety. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the steel box girder cantilever installation device of this utility model;

[0030] Figure 2 This is a schematic diagram of the support component of this utility model;

[0031] Figure 3 This is a schematic diagram of the lifting part of this utility model;

[0032] Figure 4 for Figure 1 Sectional view of section 2-2;

[0033] Figure 5 for Figure 1 Sectional view of section 1-1;

[0034] Figure 6 This is a schematic diagram of the installation of the steel box girder cantilever arm installation device and the cantilever arm of this utility model;

[0035] Figure 7 for Figure 1 Enlarged view of point A in the middle;

[0036] Figure 8 This is a schematic diagram of the installation of the steel box girder and cantilever arm.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Steel box girder; 2. Support assembly; 21. Cantilever beam; 22. Diagonal brace; 23. Upright; 231. Fixing component; 232. Upright body; 24. Diagonal tie rod; 3. Cantilever arm; 4. Lifting assembly; 41. Connecting plate; 42. Transmission unit; 43. Lifting sling; 44. Lifting hook; 45. Cable; 46. Frame beam; 47. Lifting lug; 5. Connecting assembly; 51. Fixing seat; 52. Connecting rod. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0043] With the continuous expansion of municipal bridge construction, steel box girder 1 has become the preferred structural form in complex environments due to its excellent mechanical properties. Steel box girder 1 consists of three main parts: the main box chamber, the steel cantilever arm 3, and the steel guardrail. The main box chamber, as the core load-bearing component, achieves high strength and stability through internal stiffening ribs. The steel cantilever arm 3 cantilevers laterally on both sides of the main box chamber to expand the bridge deck width or support ancillary facilities. The steel guardrail is integrated into the end of the cantilever arm 3, balancing safety and aesthetics. During construction, a lattice-type temporary support frame must first be erected under the main box chamber to ensure installation accuracy and stability. Then, a truck crane is used to hoist the steel cantilever arm 3 and guardrail components in sections, achieving a rigid connection with the main box chamber through welding or high-strength bolts, ultimately forming an integrated load-bearing system. This process places extremely high demands on the foundation bearing capacity of the main box chamber support frame, and the subsequent hoisting of the cantilever arm 3 relies on large lifting equipment, presenting significant limitations.

[0044] As a functional extension of the main beam, the steel box girder cantilever arm adopts a welded box-section design. It can withstand vertical loads from vehicles and pedestrians, and its torsional stiffness coordinates the stress on the main beam, significantly improving the overall performance of the bridge. In landscape bridges or urban interchange projects, the lightweight design and smooth lines of the cantilever arm 3 can also enhance the structural aesthetics. However, traditional cantilever arm 3 installation relies on in-situ hoisting by truck cranes, requiring road closures before construction to meet operational space needs. Especially when crossing intersections or highway sections, this often necessitates traffic disruptions for several hours or even longer. This not only exacerbates urban traffic pressure but also limits construction efficiency due to site conditions such as ground flatness and underground pipeline distribution.

[0045] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0046] According to an embodiment of this utility model, a steel box girder cantilever installation device is provided, which is fixedly connected to a steel box girder 1. The device includes: a support assembly 2, comprising a cantilever beam 21, a tie rod 24, and an upright 23, wherein one end of the upright 23, tie rod 24, and cantilever beam 21 is connected to each other, and the other end is fixedly connected to the steel box girder 1; a lifting assembly 4, which is fixedly connected to the cantilever beam 21 and includes a lifting section and a hoisting section, wherein the lifting section is fixedly connected to the cantilever beam 21, and the lifting section, hoisting section, and cantilever arm 3 are sequentially hoisted and connected from top to bottom; and a connecting assembly 5, which is adapted to connect and fix the steel box girder 1 and the cantilever arm 3 or adjacent cantilever arms 3.

[0047] The efficient installation of the steel box girder cantilever arm is achieved through the coordinated action of support component 2, lifting component 4, and connecting component 5. The cantilever beam 21, tie rod 24, and upright 23 in support component 2 form a stable triangular support structure, effectively bearing the weight of the cantilever arm 3 and distributing dynamic loads during construction, ensuring stability during installation. Lifting component 4 adopts a modular design, allowing for flexible adjustment based on different cantilever arm 3 dimensions and weights, improving lifting accuracy, reducing manual intervention, and lowering construction risks. Connecting component 5 uses a high-strength connection method to ensure rigid fixation between the cantilever arm 3 and the steel box girder 1 or adjacent cantilever arms 3, preventing loosening due to vibration or wind loads and improving the overall structural durability and safety. This eliminates the need for pre-closure of roads using a truck crane, reducing requirements on ground conditions. The device is simple in structure, easy to install, and suitable for various construction scenarios such as bridges and buildings, significantly improving construction efficiency and reducing project costs.

[0048] In some embodiments, combined with Figure 2 and Figure 5 As shown, the upright 23 includes an upright body 232 and a fixing member 231. The fixing member 231 is adapted to pass through the upright body 232, fixing the upright 23 to the steel box girder 1. Through the combined design of the upright body 232 and the fixing member 231, a quick and stable connection between the upright 23 and the steel box girder 1 is achieved. The fixing member 231, by passing through the upright body 232, not only enhances the tensile and compressive strength of the upright 23, but also effectively prevents the upright 23 from slipping or tilting under stress, improving the stability of the overall support structure. It also facilitates disassembly and reuse, reducing construction costs and improving the versatility and adaptability of the device.

[0049] Specifically, the fastener 231 is a two-way locking flange structure.

[0050] Furthermore, the support assembly 2 also includes diagonal braces 22, one end of which is attached to the cantilever beam 21 and the other end to the upright 23. The addition of diagonal braces 22 further optimizes the load-bearing performance of the support assembly 2, forming a more stable spatial truss structure. The diagonal braces 22 effectively distribute the load between the cantilever beam 21 and the upright 23, reducing deflection at the cantilever end and preventing deformation or fracture due to localized stress concentration. This improves the load-bearing capacity and wind-induced vibration resistance of the device, ensuring the safety and reliability of the construction process.

[0051] It is worth noting that the support assembly 2 is also equipped with reinforcing plates between the columns and the cantilever beam 21. By adding reinforcing plates between the columns and the cantilever beam 21, the rigidity and strength of the support assembly 2 are further improved. The reinforcing plates are made of high-strength steel and are fixed by welding or bolts, effectively enhancing the bending and shear resistance of key nodes and preventing fatigue cracking after long-term use.

[0052] As a feasible form, the cantilever beam 21, tie rod 24 and upright 23 in the support assembly 2 all adopt a telescopic design, and the length can be adjusted steplessly through a hydraulic adjustment mechanism.

[0053] In some embodiments, combined with Figure 3 and Figure 4 As shown, the lifting unit includes a transmission unit 42, a sling 43, and a hook 44. The transmission unit 42 is connected to the hook 44 via the sling 43. The combination of the transmission unit 42, sling 43, and hook 44 enables the smooth lifting of the boom 3. The transmission unit 42 can be electrically or hydraulically driven, providing stable lifting power to accommodate booms 3 of varying weights. The sling 43 uses high-strength steel wire rope or synthetic fiber rope, possessing excellent tensile strength and flexibility, effectively buffering impact loads during lifting. The hook 44 employs a self-locking or anti-detachment design to ensure the boom 3 does not accidentally detach during lifting, improving construction safety. Specifically, the transmission unit 42 is an electric hoist.

[0054] Furthermore, the lifting unit includes: a cable 45, a frame beam 46, and a lifting lug 47. One end of the cable 45 is connected to the hook 44, and the other end is connected to the lifting lug 47, which is fixedly mounted on the frame beam 46. Through the coordinated action of the cable 45, frame beam 46, and lifting lug 47, balanced lifting of the boom 3 is achieved. The lifting lug 47 is made of high-strength steel and optimized in design to ensure a firm and reliable connection with the cable 45. This lifting unit is particularly suitable for the installation of large or irregularly shaped booms 3, effectively improving lifting accuracy, reducing installation errors, and ensuring the docking quality of the boom 3 after it is in place.

[0055] Specifically, frame beam 46 is a quadrilateral structure, with cables 45 cross-connecting to its four corners. The quadrilateral structure of frame beam 46 ensures even distribution of the lifting load, preventing the cantilever arm 3 from tilting or twisting during hoisting. The cross-connection of cables 45 enhances the stability of frame beam 46, preventing deformation during hoisting.

[0056] In some embodiments, combined with Figure 7 and Figure 8 As shown, the connecting component 5 includes a fixed seat 51 and a connecting rod 52. When the steel box girder 1 and the cantilever arm 3 are fixedly connected, one end of the connecting rod 52 is fixedly connected to the fixed seat 51, and the other end is connected to the upright 23. The fixed seat 51 is fixedly installed to the cantilever arm 3.

[0057] The combination of the fixed base 51 and the connecting rod 52 achieves a high-strength connection between the steel box girder 1 and the cantilever arm 3. The fixed base 51 is fixed by welding or bolting to ensure a firm connection with the cantilever arm 3. One end of the connecting rod 52 is connected to the fixed base 51, and the other end is connected to the upright 23, forming a stable force transmission path, effectively distributing the load on the cantilever arm 3 and preventing excessive local stress on the steel box girder 1. This connection method not only improves the installation accuracy of the cantilever arm 3, but also enhances the overall structure's resistance to wind vibration and fatigue.

[0058] Specifically, the connecting rod 52 is a rigid rod, and the fixing seat 51 is connected to the connecting rod 52 by bolts. Optionally, the fixing seat 51 of the connecting assembly 5 is a split clamp structure, and quick-connect pin interfaces are provided at both ends of the connecting rod 52. The fixing seats 51 between adjacent cantilever arms 3 are pre-installed with guide grooves, and automatically lock after the connecting rod 52 is inserted.

[0059] In one implementation, when the connecting assembly 5 is fixedly connected to adjacent cantilever arms 3, both ends of the connecting rod 52 are respectively fixedly connected to the fixing seats 51, and the fixing seats 51 are respectively fixedly installed to the adjacent cantilever arms 3. A rigid connection is achieved through the fixing seats 51 and the connecting rod 52, ensuring uniform load transfer among multiple cantilever arm segments 3. The two ends of the connecting rod 52 are respectively fixed to the fixing seats 51 of adjacent cantilever arms 3, forming a continuous integral structure, effectively preventing relative displacement or misalignment between the cantilever arms 3. This method is suitable for the installation of continuous cantilever arms 3, improving the overall rigidity and stability of the structure and extending its service life.

[0060] It is worth noting that multiple cantilever installation devices are used for the steel box girder, with multiple cantilever arms 3 fixedly installed on both sides of the steel box girder 1. By setting up multiple steel box girder cantilever installation devices, the synchronous and symmetrical installation of the cantilever arms 3 on both sides of the steel box girder 1 is achieved. The coordinated operation of multiple devices can significantly improve construction efficiency and shorten the construction period. At the same time, the symmetrical installation method ensures that the steel box girder 1 is subjected to balanced forces, avoiding skewing or twisting caused by excessive load on one side, and improving the stability and safety of the overall structure.

[0061] The specific construction process is as follows:

[0062] First, based on the drawings, determine the positions of the support components 2 and connecting components 5 for each segment of the steel cantilever arm 3 in advance, complete the measurement and layout, and mark the points; then, according to the marked points, install and weld the support components 2 and connecting devices on the bridge deck, install the lifting components 4 under the cantilever beam 21, and transport the steel box girder cantilever arm to the installation position; next, connect the lifting unit to the cantilever arm 3 lifting lug 47 via hooks, and connect the lifting unit to the lifting unit via slings 43; then, slowly lift the cantilever arm 3 to a suitable height and activate the lifting unit's start brake; then wait for the cantilever arm to... After the cantilever arm 3 is in place, it is longitudinally connected to the main box of the steel box girder 1 by three positioning bolts. The bolt at the center of the cantilever arm 3 is connected to the back tie rod 23, and the two bolts at the end of the steel cantilever arm 3 are connected to the bolt positioning device above the main box, thereby controlling the lateral coordinate accuracy of the cantilever arm 3. Then, the next segment of the cantilever arm 3 is hoisted. Adjacent segments of the cantilever arm 3 are connected by a connecting component 5, thereby controlling the longitudinal coordinate accuracy of the cantilever arm 3. Finally, the longitudinal and lateral connecting components 5 are used to make the overall positioning of the cantilever arm 3 accurate. Then, the remaining segments of the cantilever arm 3 are installed in sequence until all cantilever arms 3 are installed.

[0063] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A cantilever installation device for a steel box girder, fixedly connected to a steel box girder (1), characterized in that, include: The support assembly (2) includes a cantilever beam (21), a tie rod (24) and a vertical pole (23). One end of the vertical pole (23), the tie rod (24) and the cantilever beam (21) are connected to each other, and the other end is fixedly connected to the steel box girder (1). The lifting assembly (4) is fixedly connected to the cantilever beam (21) and includes a lifting part and a hoisting part. The lifting part is fixedly connected to the cantilever beam (21), and the lifting part, the hoisting part and the cantilever arm (3) are hoisted and connected sequentially from top to bottom. A connecting component (5) adapted to connect and fix the steel box girder (1) and the cantilever arm (3) or adjacent cantilever arms (3).

2. The steel box girder cantilever installation device according to claim 1, characterized in that, The upright (23) includes an upright body (232) and a fixing member (231). The fixing member (231) is adapted to pass through the upright body (232) so that the upright (23) is fixed to the steel box girder (1).

3. The steel box girder cantilever installation device according to claim 1, characterized in that, The support assembly (2) also includes a diagonal brace (22), one end of which is disposed on the cantilever beam (21) and the other end of which is disposed on the upright (23).

4. The steel box girder cantilever installation device according to claim 3, characterized in that, The lifting unit includes a transmission unit (42), a sling (43), and a hook (44), wherein the transmission unit (42) is connected to the hook (44) via the sling (43).

5. The steel box girder cantilever installation device according to claim 4, characterized in that, The hoisting unit includes: a cable (45), a frame beam (46), and a lifting lug (47). One end of the cable (45) is connected to the hook (44), and the other end is connected to the lifting lug (47). The lifting lug (47) is fixedly installed on the frame beam (46).

6. The steel box girder cantilever installation device according to claim 5, characterized in that, The frame beam (46) has a quadrilateral structure, and the cables (45) are cross-connected to the four corners of the frame beam (46).

7. The steel box girder cantilever installation device according to claim 1, characterized in that, The connecting assembly (5) includes a fixed seat (51) and a connecting rod (52). When the steel box girder (1) and the cantilever arm (3) are fixedly connected, one end of the connecting rod (52) is fixedly connected to the fixed seat (51), and the other end is connected to the upright (23). The fixed seat (51) is fixedly installed to the cantilever arm (3).

8. The steel box girder cantilever installation device according to claim 7, characterized in that, When the connecting component (5) is fixedly connected to the adjacent cantilever arm (3), both ends of the connecting rod (52) are fixedly connected to the fixed seat (51), and the fixed seat (51) is fixedly installed to the adjacent cantilever arm (3).

9. The steel box girder cantilever installation device according to claim 8, characterized in that, The support assembly (2) is also provided with reinforcing plates on the upright (23) and the cantilever beam (21).

10. The steel box girder cantilever installation device according to claim 1, characterized in that, The number of steel box girder cantilever installation devices is multiple, and multiple cantilever arms (3) are fixedly installed on both sides of the steel box girder (1).

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