A steel-concrete composite beam erection system based on a bridge deck crane

Abstract

The present invention provides a steel-concrete composite beam erection system based on a bridge deck crane, which at least includes a bridge deck crane. The bridge deck crane is supported and anchored on the upper part of the already erected steel beam section. Front suspension beams are movably connected to the front ends of the upper longitudinal beams, and the front suspension beams move longitudinally along the upper longitudinal beams. The bridge deck crane is equipped with a beam transport vehicle and a construction platform. The beam transport vehicle is located on the already erected steel beam section. Anti-hanging wheels and first suspension rods are arranged on both sides of the rear end of the construction platform. The construction platform is suspended on the I-shaped track at the bottom of the front end of the already erected steel beam section through the anti-hanging wheels, or is anchored to the bottom of the front end of the already erected steel beam section through the first suspension rods. The two sides of the front end of the construction platform are hoisted and fixed on the front suspension beams of the left and right upper longitudinal beams through second suspension rods, and the construction platform is horizontally arranged as a whole. This erection system realizes tail feeding of beams by installing a construction platform on the bridge, and the construction platform, the bridge deck crane and the beam transport vehicle work together, with relatively high construction efficiency and high construction safety.

Description

Technical Field

[0001] The present invention relates to the technical field of long-span bridge construction, and particularly relates to a steel-concrete composite beam erection system based on a deck crane. Background Art

[0002] The steel-concrete composite beam includes steel side beams on both sides, more than one steel cross beam connected between the two steel side beams, and a bridge deck. Among them, the steel side beams and the steel cross beams together form a steel beam framework, and the bridge deck is embedded in the steel beam framework. Generally during construction, the steel-concrete composite beam is usually pre-assembled and manufactured in a factory first, and then the steel-concrete composite beams are erected one by one. At present, the erection of steel-concrete composite beams on highways and cross-river and cross-sea bridges is generally completed by a deck crane. When the deck crane hoists the steel-concrete composite beam, it is necessary to transport the pre-assembled steel-concrete composite beam to the bottom of the bridge through a steel trestle or a beam carrier ship, and then hoist and erect it by the hoisting trolley on the deck crane. However, the deck crane has the following problems during erection construction: (1) The environment at the bottom of the bridge is very complex during construction. Especially during the erection construction of highway bridges, there may be railway marshalling yards and railway lines and other buildings that cannot be demolished or effectively protected at the bottom of the bridge, increasing the construction difficulty; (2) When the deck crane hoists, the self-weight of the crane and the weight of the pre-assembled steel-concrete composite beam being hoisted generate a relatively large load on the steel beam section that has been erected on the bridge deck. In addition, if the erection time is long, the action time of the load is also long; (3) During hoisting and erection, since the lifting tool cannot be fixed, the pre-assembled steel-concrete composite beam shakes during erection, making the assembly operation difficult, time-consuming and laborious; (4) The lifting height of the deck crane is relatively high, and there is no safety protection for the surrounding environment, and it is difficult to guarantee the safety during hoisting and assembly. Summary of the Invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a steel-concrete composite beam erection system based on a deck crane. The erection system realizes the scattered erection of the steel-concrete composite beam by installing a construction platform on the bridge. The construction platform, the deck crane and the beam carrier vehicle together reduce the single-time lifting weight and at the same time reduce the construction load of the steel beam that has been erected during the construction process, solve the problem of feeding the beam when the beam cannot be fed under the bridge, and has relatively high construction efficiency and high construction safety.

[0004] The technical solution adopted to achieve the above object of the present invention is as follows:

[0005] A steel-concrete composite beam erection system based on a bridge deck crane, at least including a bridge deck crane. The bridge deck crane includes a space truss, front and rear fulcrum assemblies, a rear anchor point assembly, a longitudinal movement mechanism, a hoisting trolley, a hydraulic unit, and an electrical unit. The space truss at least includes an upper longitudinal beam and a lower longitudinal beam. The hoisting trolley is installed on the upper longitudinal beam and travels along the upper longitudinal beam. An I-shaped track is provided at the bottom of the erected steel beam section. The bridge deck crane is supported and anchored to the upper part of the erected steel beam section through the front and rear fulcrum assemblies and the rear anchor point assembly. The front ends of the upper longitudinal beams are movably connected with front hanging beams, and the front hanging beams move longitudinally along the upper longitudinal beam. The bridge deck crane is equipped with a beam transport vehicle and a construction platform. The beam transport vehicle is located on the erected steel beam section and behind the bridge deck crane. Anti-hanging wheels and first suspension rods are provided on both sides at the rear end of the construction platform. The construction platform is suspended on the I-shaped track at the bottom of the front end of the erected steel beam section through the anti-hanging wheels, or is anchored to the bottom of the front end of the erected steel beam section through the first suspension rods. The two sides at the front end of the construction platform are hoisted and fixed to the front hanging beams on the left and right upper longitudinal beams, and the construction platform is horizontally arranged as a whole.

[0006] Third suspension rods for temporary anchoring during span crossing are provided between both sides of the construction platform and the newly erected steel beam section, and the third suspension rods are anchored to the cross-section of the front steel side beam of the newly erected steel beam section.

[0007] The first suspension rods are all anchored to the steel side beams of the erected steel beam section. One set of first suspension rods is provided on each of the two steel side beams, and each set of first suspension rods includes four first suspension rods arranged in a square matrix.

[0008] The front hanging beam is connected with the hoisting trolley through a pin, and the front hanging beam moves longitudinally along the upper longitudinal beam with the hoisting trolley.

[0009] A three-dimensional adjustment mechanism for adjusting the position of the steel side beam is installed on the construction platform. There are two sets of three-dimensional adjustment mechanisms, which are respectively installed on both sides of the construction platform.

[0010] The construction platform includes a platform frame, a bottom plate welded to the platform frame, and guardrails and kick plates connected to the periphery of the platform frame.

[0011] The space truss includes two vertical trusses arranged side by side, as well as a front cross beam, a rear cross beam, and a bottom cross beam connected between the two vertical trusses. Each vertical truss includes an upper longitudinal beam, a lower longitudinal beam, a front vertical beam, a rear vertical beam, a first diagonal bracing beam, and a second diagonal bracing beam. Among them, the length of the upper longitudinal beam is greater than that of the lower longitudinal beam. The rear vertical beam is connected to the rear ends of the upper longitudinal beam and the lower longitudinal beam. The front vertical beam is connected to the front end of the lower longitudinal beam and the upper longitudinal beam. The front end of the upper longitudinal beam extends to be flush with the front end of the construction platform. The first diagonal bracing beam is connected to the rear end of the lower longitudinal beam and the connection point between the front vertical beam and the upper longitudinal beam. The second diagonal bracing beam is connected to the vicinity of the front end of the upper longitudinal beam and the vicinity of the end of the bottom cross beam. The front cross beam is connected to the front ends of the two upper longitudinal beams. The rear cross beam is connected to the rear ends of the two upper longitudinal beams. The bottom cross beam is connected to the front ends of the two lower longitudinal beams.

[0012] The overhead crane includes a hoisting trolley and a crane cross beam. A slewing spreader is configured on the overhead crane, and the overhead crane is connected to the electrical unit.

[0013] Compared with the prior art, the steel-concrete composite beam erection system provided by the present invention has the following advantages: 1. The steel-concrete composite beam erection system provided by the present invention includes a bridge deck crane, a beam transporter, and a construction platform. The beam transporter transports and feeds the steel side beam, steel cross beam, and bridge deck. The bridge deck crane has the functions of feeding the beam at the tail, hoisting and installing, and the whole machine crossing the span. The construction platform assembles the steel side beam and steel cross beam and is used for the safety protection of the construction such as the bridge deck and the tensioning of the cable-stayed bridge. It realizes the feeding of the beam at the tail of the whole erection system and does not require feeding the beam from the bottom of the bridge, which is applicable to the erection of bridges in complex bridge bottom construction environments such as railway marshalling yards and railway lines existing at the bottom of highway bridges, and has a wide range of applications.

[0014] 2. In the present invention, the bridge deck crane can hoist each component of the steel-concrete composite beam one by one and perform loose piece assembly on the construction platform, effectively reducing the maximum lifting weight of the overhead crane. The lifting force application points of the construction platform are respectively at the front end of the already erected steel beam section and the rear end of the already erected steel beam section (at the position of the rear anchor point assembly of the bridge deck crane), and the force is relatively uniform, having less impact on the bridge deck performance. The assembly of each component of the steel-concrete composite beam is carried out on the construction platform, which is convenient, safe, and has high construction efficiency.

[0015] 3. The steel-concrete composite beam erection system provided by the present invention can realize the overall longitudinal movement, can continuously carry out erection construction, and the safety of crossing the span is ensured by the setting of the third suspension rod when crossing the span.

[0016] 4. In the present invention, guardrails and kick plates are arranged around the construction platform, which can ensure that no foreign objects will fall during construction and guarantee the safety of the surrounding construction environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the steel-concrete composite beam in the present invention;

[0018] Among them, (a) is the steel-concrete composite beam after assembly, and (b) is the unassembled steel-concrete composite beam;

[0019] Figure 2 It is the left view of the steel-concrete composite beam in the present invention;

[0020] Among them, (a) is the steel-concrete composite beam after assembly, and (b) is the unassembled steel-concrete composite beam;

[0021] Figure 3 It is the left view of the steel-concrete composite beam erection system provided by the present invention when in the erection state;

[0022] Figure 4 It is Figure 3 the front view in the A direction in

[0023] Figure 5 It is Figure 3 the front view in the B direction in

[0024] Figure 6 It is Figure 3 the front view in the C direction in

[0025] Figure 7 It is the structural schematic diagram of the space truss in the present invention;

[0026] Among them, (a) is the front view, (b) is the left view, and (c) is the top view;

[0027] Figure 8 It is the structural schematic diagram of the overhead crane in the present invention;

[0028] Among them, (a) is the front view and (b) is the left view;

[0029] Figure 9 It is the structural schematic diagram of the construction platform in the present invention;

[0030] Among them, (a) is the front view, (b) is the left view, and (c) is the top view;

[0031] Figure 10 It is the erection construction schematic of the steel-concrete composite beam erection system in the present invention Figure One ;

[0032] Among them, (a) is the left view and (b) is the front view;

[0033] Figure 11 It is the erection construction schematic of the steel-concrete composite beam erection system in the present invention Figure Two ;

[0034] Among them, (a) is the left view and (b) is the front view;

[0035] Figure 12Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Three ;

[0036] Figure 13 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Four ;

[0037] Among them, (a) is the left view, (b) is the main view;

[0038] Figure 14 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Five ;

[0039] Figure 15 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Six ;

[0040] Among them, (a) is the left view, (b) is the main view;

[0041] Figure 16 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Seven ;

[0042] Figure 17 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Eight ;

[0043] Among them, (a) is the left view, (b) is the main view;

[0044] Figure 18 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Nine ;

[0045] Among them, (a) is the left view, (b) is the main view;

[0046] Figure 19 Schematic diagram of the construction of the steel-concrete composite beam erection system of the present invention Figure Ten ;

[0047] Figure 20 The cross-span diagram of the steel-concrete composite beam erection system of the present invention is shown in FIG. Figure One ;

[0048] Figure 21 The cross-span diagram of the steel-concrete composite beam erection system of the present invention is shown in FIG. Figure Two ;

[0049] Figure 22 The cross-span diagram of the steel-concrete composite beam erection system of the present invention is shown in FIG. Figure Three ;

[0050] Figure 23Schematic diagram of spanning a span for the steel-concrete composite beam erection system in the present invention Figure Four ;

[0051] Figure 24 Schematic diagram of spanning a span for the steel-concrete composite beam erection system in the present invention Figure Five ;

[0052] Figure 25 Schematic diagram of spanning a span for the steel-concrete composite beam erection system in the present invention Figure Six ;

[0053] In the figure: 1 - steel-concrete composite beam, 1a - erected steel beam section, 1b - newly erected steel beam section, 11 - steel side beam, 12 - steel cross beam, 121 - front-end steel cross beam, 122 - intermediate steel cross beam, 123 - rear-end steel cross beam;

[0054] 2 - bridge deck crane, 21 - space truss, 211 - upper longitudinal beam, 212 - lower longitudinal beam, 213 - front vertical beam, 214 - rear vertical beam, 215 - first diagonal bracing beam, 216 - second diagonal bracing beam, 217 - front cross bracing beam, 218 - rear cross bracing beam, 219 - bottom cross bracing beam;

[0055] 22 - front and rear fulcrum assembly, 23 - rear anchor assembly, 24 - longitudinal movement mechanism, 25 - hoisting overhead crane, 251 - hoisting trolley, 252 - overhead crane cross beam, 26 - hydraulic unit, 27 - front lifting beam;

[0056] 3 - construction platform, 31 - platform frame, 32 - guardrail, 33 - second suspension rod anchoring hole, 34 - first suspension rod anchoring hole, 35 - three-dimensional adjustment mechanism;

[0057] 4 - beam transporter, 5 - reverse hanging wheel, 6 - first suspension rod, 7 - second suspension rod, 8 - third suspension rod, 9 - stay cable. Detailed implementation mode

[0058] The present invention will be described in detail below with reference to the accompanying drawings.

[0059] The present invention provides a steel-concrete composite beam erection system based on a bridge deck crane. The structure of the steel-concrete composite beam 1 is as shown in Figure 1 and Figure 2 , and includes steel side beams on both sides, more than one steel cross beam connected between the two steel side beams, and a bridge deck. Among them, the steel side beam 11 and the steel cross beam 12 jointly form a steel beam framework. In this embodiment, the steel beam framework is composed of a left steel side beam, a right steel side beam, a front-end steel cross beam 121, an intermediate steel cross beam 122, and a rear-end steel cross beam 123. The bridge deck is embedded on the steel beam framework to form an erected steel beam section on the bridge.

[0060] In this embodiment, the steel-concrete composite beam erection system includes a bridge deck crane 2, a beam transporter 4, and a construction platform 3. Its structure is as shown in Figures 3 - 6As shown in the figure. The beam transporter is located on the erected steel beam section 1a and behind the deck crane. The beam transporter can travel on the erected steel beam section and is used for transporting and feeding steel side beams, steel cross beams, and bridge deck panels. In this embodiment, the beam transporter adopts a tire-type traveling method, which is convenient for work, has multiple uses, and has good economy. The deck crane can realize the functions of feeding beams at the tail, hoisting and installing, and the whole machine crossing the span. The construction platform is used for assembling steel side beams and steel cross beams and for the safety protection of construction such as bridge deck panels and cable-stayed bridge tensioning.

[0061] In this embodiment, the deck crane includes a space truss 21, front and rear fulcrum assemblies 22, a rear anchor point assembly 23, a longitudinal movement mechanism 24, a hoisting trolley 25, a hydraulic unit 26, an electrical unit, and a front lifting beam 27, as Figures 3 - 6 shown in the structural diagram of the deck crane in the figure. The deck crane is supported on the erected steel beam section 1a through the front and rear fulcrum assemblies. The rear anchor point assembly is temporarily anchored to the rear end of the erected steel beam section 1a to prevent the deck crane from tipping forward during hoisting operations. In this embodiment, both the front and rear fulcrum assemblies and the rear anchor point assembly are supported and anchored at the steel cross beam section of the steel-concrete composite beam to ensure the lateral stability of the deck crane. The deck crane moves across the span through the longitudinal movement mechanism, and the longitudinal movement mechanism realizes the longitudinal movement action by means of hydraulic cylinder pushing and pulling. The hydraulic unit includes hydraulic cylinders and hydraulic units configured on the front and rear fulcrum assemblies, the rear anchor point assembly, and the longitudinal movement mechanism. The electrical unit mainly includes the power supply of the hydraulic unit and the electrical unit of the hoisting trolley.

[0062] The structure of the space truss is as Figure 7 shown, including two vertically arranged parallel vertical trusses and a front cross beam 217, a rear cross beam 218, and a bottom cross beam 219 connected between the two vertical trusses. Each vertical truss includes an upper longitudinal beam 211, a lower longitudinal beam 212, a front vertical beam 213, a rear vertical beam 214, a first diagonal bracing beam 215, and a second diagonal bracing beam 216. Among them, the length of the upper longitudinal beam is greater than that of the lower longitudinal beam. The rear vertical beam is connected to the rear ends of the upper longitudinal beam and the lower longitudinal beam, and the front vertical beam is connected to the front end of the lower longitudinal beam and the upper longitudinal beam. The front end of the upper longitudinal beam extends to be flush with the front end of the construction platform. The first diagonal bracing beam is connected to the rear end of the lower longitudinal beam and the connection between the front vertical beam and the upper longitudinal beam. The second diagonal bracing beam is connected to the upper longitudinal beam near the front end and the bottom cross beam near the end; the front cross beam is connected to the front ends of the two upper longitudinal beams, the rear cross beam is connected to the rear ends of the two upper longitudinal beams, and the bottom cross beam is connected to the front ends of the two lower longitudinal beams. Since the steel-concrete composite beam erection system provided in this embodiment feeds the beam from the tail of the deck crane, the space truss of the deck crane is not a conventional diamond-shaped setting, but a three-dimensional square structure in space. In this way, the hoisting trolley can travel along the upper longitudinal beam to the rear end of the space truss (i.e., the rear end of the deck crane), and the beam transporter travels to the lower part of the space truss. The hoisting trolley lifts the workpiece on the beam transporter, thereby realizing feeding the beam at the tail.

[0063] The structure of the hoisting trolley is asFigure 8 As shown, it includes a lifting trolley 251 and a crane beam 252. The lifting trolley is installed on the upper longitudinal beam and moves longitudinally along the upper longitudinal beam. At the same time, the lifting trolley on the lifting trolley can move laterally along the crane beam. The lifting trolley is connected to the electrical unit. The electrical unit of the lifting trolley is the electrical unit of a conventional bridge crane. The lifting and hoisting are all electrically driven with variable frequency control to achieve longitudinal movement, lateral movement and fine adjustment of the lifting trolley. In this embodiment, the lifting trolley adopts double hoisting, and the pulley group ratio is 12 to ensure that the lifting pole beam below can remain horizontal during operation. The lifting trolley is equipped with a rotary sling under it, which can realize ±180° rotation of the hoisted workpiece.

[0064] The front hanging beam is movably installed at the front end of the upper longitudinal beam. The upper longitudinal beams on both sides are equipped with front hanging beams. In this embodiment, when the steel-concrete composite beam erection system is in the erection state, the front hanging beam is always at the front end of the upper longitudinal beam. Figure 3 As shown, both sides of the front end of the construction platform are suspended by the front suspension beam and the second suspension rod 7. In this embodiment, the front suspension beam is not provided with a power device. When in the over-span state, the crane moves to the front end of the upper longitudinal beam and is connected to the front suspension beam through a latch, thereby driving the front suspension beam to move along the upper longitudinal beam.

[0065] The two sides of the rear end of the construction platform are provided with anti-hanging wheels 5 and a first suspension rod 6. The construction platform is suspended on the I-shaped track at the bottom of the front end of the erected steel beam section through the anti-hanging wheels, or is anchored to the bottom of the front end of the erected steel beam section through the first suspension rod. The I-shaped track in this embodiment is the running track of the maintenance trolley at the bottom of the erected steel beam section. When in the over-span state, the construction platform realizes longitudinal running through the anti-hanging wheels; but when in the erection construction state, the anti-hanging wheel group is vacated and unloaded, and both sides of the rear end of the construction platform are anchored to the bottom of the front end of the erected steel beam section through the first suspension rod. The four corners of the construction platform are respectively lifted on the erected steel beam section and the bridge crane through the first suspension rod and the second suspension rod, and the construction platform is set horizontally as a whole. In this embodiment, the first suspension rods are anchored on the steel side beams of the erected steel beam section, and each of the steel side beams on both sides is provided with a group of first suspension rods, and each group of first suspension rods includes four first suspension rods arranged in a square array to ensure the safety and stability of the construction platform. A three-dimensional adjustment mechanism 35 for adjusting the position of the steel side beam is installed on the construction platform. When the construction platform is stably installed and connected, the bridge crane hoists the three-dimensional adjustment mechanism onto the construction platform for installation. In this embodiment, two sets of three-dimensional adjustment mechanisms are provided, which are installed on both sides of the construction platform respectively, and are used for the lateral movement, longitudinal movement, vertical lifting and rotation of the left steel side beam and the right steel side beam, so as to accurately adjust the spatial position of the steel side beam and enable the steel side beam to be docked and installed with the steel side beam of the erected steel beam section.

[0066] The structure of the construction platform in this embodiment is as follows Figure 9As shown in the figure, it includes a bench 31, a bottom plate welded to the bench, and a guardrail 32 and a kickboard connected to the periphery of the bench, ensuring that no foreign objects will fall during construction and guaranteeing the safety of the surrounding construction environment. There are second boom anchoring holes 33 and first boom anchoring holes 34 for the second boom and the first boom anchoring respectively at the front end and the rear end of the construction platform.

[0067] In addition, after the steel beam section is erected, the entire steel-concrete composite beam erection system needs to move across the span. When moving across the span, if the first boom is directly removed and the deck crane and the construction platform move synchronously, at this time the deck crane is connected and fixed to the erected steel beam section, and the deck crane cannot lift the front end of the construction platform, which is very likely to cause construction accidents. Therefore, when the steel-concrete composite beam erection system provided in this embodiment moves across the span, it is necessary to first complete the span crossing of the deck crane. After the deck crane completes the span crossing and is anchored to the just-erected steel beam section, then the construction platform crosses the span. When the deck crane crosses the span, the connection of the second boom to the construction platform needs to be released. At this time, the connection of the construction platform mainly relies on the back-hanging wheels at the rear end of the construction platform and the first boom. The back-hanging wheels and the upper front girder move longitudinally, driving the construction platform to complete the longitudinal movement forward. In this embodiment, third booms 8 for temporary anchoring during span crossing are provided between the two sides of the construction platform and the just-erected steel beam section. The third booms are anchored to the cross-section of the front steel side girder of the just-erected steel beam section, as Figure 20 shown. Ensure that when the deck crane crosses the span, the front end and the rear end of the construction platform are fixed to the bridge and are completely separated from the deck crane, so as not to affect the stability of the deck crane during span crossing.

[0068] The erection method of the steel-concrete composite beam erection system in this embodiment includes the following steps: (1) Preparation of the working state of the erection system: The deck crane stands and is fixed on the upper part of the erected steel beam section. The two sides at the rear end of the construction platform are suspended and temporarily fixed to the bottom of the front end of the erected steel beam section. The two sides at the front end of the construction platform are hoisted on the front girders at the front end of the upper longitudinal beam of the deck crane. The construction platform is horizontal as a whole, and the construction schematic diagram is as Figure 10 shown;

[0069] Specifically, in this embodiment, the deck crane is fixed to the erected steel beam section through the front and rear fulcrum assemblies and the rear anchor assembly. When crossing the span, back-hanging wheels are provided on both sides at the rear end of the construction platform and are suspended on the I-shaped rails at the bottom of the erected steel beam section through the back-hanging wheels. During construction, both sides at the rear end of the construction platform are anchored to the bottom of the front end of the erected steel beam section through the first boom. The two sides at the front end of the construction platform are hoisted on the front girders through the second boom. In this embodiment, the front girders are a group of unpowered roller cars that can move longitudinally on the upper longitudinal beam. In addition, a three-dimensional adjustment mechanism is required when assembling the steel-concrete composite beam on the construction platform later. Therefore, before hoisting the steel side girder of the steel-concrete composite beam, the three-dimensional adjustment mechanism needs to be hoisted onto the construction platform for installation first. After installing the various structural components of the steel-concrete composite beam, it is hoisted to the erected steel beam section for temporary storage;

[0070] (2) After the erection system is ready for operation, the girder carrier transports the components of the steel girder framework of the steel-concrete composite girder to the underside of the deck crane respectively. The hoisting mechanism of the deck crane hoists each component to the construction platform and assembles them;

[0071] Specifically, in this embodiment, the hoisting mechanism is a gantry crane. The girder carrier transports the steel side girder of the steel-concrete composite girder to the underside of the deck crane. The gantry crane travels to the rear end of the deck crane and hoists the steel side girder to above the construction platform. The gantry crane lowers the steel side girder onto the construction platform, then returns to the rear end of the deck crane to hoist the other side steel side girder to the construction platform. As Figures 11 - 13 shown, the three-dimensional adjustment mechanism adjusts the steel side girder to the installation position. As Figure 14 shown; the girder carrier transports the steel cross girder of the steel-concrete composite girder to the underside of the deck crane. The steel cross girder is placed along the longitudinal direction of the bridge. The gantry crane travels to the middle position of the steel cross girder and hoists the steel cross girder to above the construction platform. As Figures 15 - 17 shown, the slewing spreader on the gantry crane slews 90°, making the longitudinal direction of the steel cross girder consistent with the transverse direction of the bridge. As Figure 18 shown, after the gantry crane travels to the installation position of the steel cross girder, it lowers the steel cross girder to the rear end installation position and assembles it with the side steel girders on both sides. All the steel cross girders are hoisted and assembled from the rear end to the front end in sequence to complete the assembly of the steel girder framework. As Figure 19 shown, the rear steel side girder, the middle steel side girder and the front steel side girder are installed in sequence;

[0072] (3) After the steel girder framework is assembled, the stay cables 9 are installed on the steel girder framework and tensioned and fixed. Then, the deck crane hoists the deck slab onto the steel girder framework to complete the assembly of the deck slab. The stay cables are tensioned again to complete the erection of the steel-concrete composite girder;

[0073] (4) Preparation for the over-span state of the erection system: Temporarily fix the construction platform to the front end of the just-erected steel girder section, remove the hoisting between the construction platform and the deck crane. The hoisting mechanism travels to the rear end of the deck crane and parks and anchors. Remove the fixation of the deck crane to the already-erected steel girder section (i.e., the rear anchor rod connecting the rear anchor point assembly to the already-erected steel girder section) to prepare for longitudinal movement over the span;

[0074] Specifically, in this embodiment, the three-dimensional adjustment mechanism needs to be hoisted to the already-erected steel girder section for temporary storage first. The cross section of the front steel cross girder of the just-erected steel girder section of the construction platform is temporarily anchored through the third suspension rod. The working schematic diagram is as Figure 20 shown. Remove the second suspension rod between the construction platform and the deck crane. The gantry crane travels to the rear end of the deck crane and parks and anchors. Release the constraints of the front and rear fulcrum assemblies and the rear anchor point assembly of the deck crane from the bridge to prepare for longitudinal movement over the span. The working schematic diagram is asFigure 21 as shown

[0075] (5) The bridge deck crane is longitudinally moved to the next construction position (the just erected steel girder section) through the longitudinal movement mechanism and stands still. The working schematic diagram is as Figure 22 shown

[0076] (6) The front lifting beam travels backward along the upper longitudinal beam to the hoisting position at the front end of the construction platform and hoists the front end of the construction platform;

[0077] Specifically, in this embodiment, the hoisting mechanism (crane trolley) drives the front lifting beam to longitudinally move along the upper longitudinal beam. The crane trolley travels to the front end of the bridge deck crane and is connected to the front lifting beam as a whole. The crane trolley drives backward and drives the front lifting beam to travel backward to the position of the second suspension rod of the construction platform, lowers the second suspension rod on the front lifting beam, hoists the construction platform and fixes it to the front lifting beam. The working schematic diagram is as Figure 23 shown

[0078] (7) Remove the temporary fixation (i.e., the first suspension rod and the third suspension rod) between the construction platform and the already erected steel girder section and the just erected steel girder section. The rear end of the construction platform is suspended on the I-shaped track at the bottom of the front end of the already erected steel girder section through the reverse hanging wheel. At this time, the construction platform is hoisted by the second suspension rod and the reverse hanging wheel. The working schematic Figure 24 is shown

[0079] (8) The crane trolley and the reverse hanging wheel travel synchronously, driving the construction platform to travel forward synchronously to complete the work of crossing the span. The working schematic diagram is as Figure 25 shown

[0080] (9) Restore to the erection state of the erection system, as Figure 10 shown, and prepare for the installation construction of the next section.

Claims

1. A steel-concrete composite beam erection system based on a bridge deck crane, at least including a bridge deck crane, the bridge deck crane includes a space truss, front and rear fulcrum assemblies, a rear anchor assembly, a longitudinal movement mechanism, a lifting crane, a hydraulic unit and an electrical unit, the space truss at least includes an upper longitudinal beam and a lower longitudinal beam, the lifting crane is installed on the upper longitudinal beam and travels along the upper longitudinal beam, and an I-shaped track is arranged at the bottom of the erected steel beam section, and it is characterized in that: The bridge deck crane is supported and anchored to the upper part of the already erected steel girder section through the front and rear support assemblies and the rear anchor assembly. The front ends of the upper longitudinal beams are movably connected with front suspension beams. The front suspension beams are connected to the hoisting overhead crane through pins. The front suspension beams move longitudinally along the upper longitudinal beams with the hoisting overhead crane. The bridge deck crane is equipped with a beam transport vehicle and a construction platform. The beam transport vehicle is located on the already erected steel girder section and behind the bridge deck crane. Anti-hanging wheels and first suspension rods are arranged on both sides of the rear end of the construction platform. The construction platform is suspended on the I-shaped track at the bottom of the front end of the already erected steel girder section through the anti-hanging wheels, or is anchored to the bottom of the front end of the already erected steel girder section through the first suspension rods. The two sides of the front end of the construction platform are hoisted and fixed to the front suspension beams of the left and right upper longitudinal beams, and the construction platform is arranged horizontally as a whole. Third suspension rods for temporary anchoring during span crossing are arranged between both sides of the construction platform and the just-erected steel girder section. The third suspension rods are anchored to the cross section of the front steel side beam of the just-erected steel girder section.

2. The steel-concrete composite beam erection system based on the bridge deck crane according to claim 1, characterized in that: The first suspension rods are all anchored to the steel side beams of the already erected steel girder section. One set of first suspension rods is arranged on each of the two steel side beams. Each set of first suspension rods includes four first suspension rods arranged in a square matrix.

3. The steel-concrete composite beam erection system based on the bridge deck crane according to claim 1, wherein: A three-dimensional adjustment mechanism for adjusting the position of the steel side beam is installed on the construction platform. There are two sets of three-dimensional adjustment mechanisms, which are respectively installed on both sides of the construction platform.

4. The steel-concrete composite beam erection system based on the bridge deck crane according to claim 1, wherein: The construction platform includes a platform frame, a bottom plate welded to the platform frame, and guardrails and skirting boards connected to the periphery of the platform frame.

5. The steel-concrete composite beam erection system based on the deck crane according to claim 1, characterized in that: The space truss includes two vertically arranged side-by-side vertical trusses, and a front cross beam, a rear cross beam, and a bottom cross beam connected between the two vertical trusses. Each vertical truss includes an upper longitudinal beam, a lower longitudinal beam, a front vertical beam, a rear vertical beam, a first diagonal bracing beam, and a second diagonal bracing beam. Among them, the length of the upper longitudinal beam is greater than that of the lower longitudinal beam. The rear vertical beam is connected to the rear ends of the upper longitudinal beam and the lower longitudinal beam. The front vertical beam is connected to the front end of the lower longitudinal beam and the upper longitudinal beam. The front end of the upper longitudinal beam extends to be flush with the front end of the construction platform. The first diagonal bracing beam is connected to the rear end of the lower longitudinal beam and the connection part of the front vertical beam and the upper longitudinal beam. The second diagonal bracing beam is connected to the upper longitudinal beam near the front end and the bottom cross beam near the end. The front cross beam is connected to the front ends of the two upper longitudinal beams. The rear cross beam is connected to the rear ends of the two upper longitudinal beams. The bottom cross beam is connected to the front ends of the two lower longitudinal beams.

6. The steel-concrete composite beam erection system based on the bridge deck crane according to claim 1, wherein: The hoisting overhead crane includes a hoisting trolley and a trolley cross beam. A slewing spreader is configured on the hoisting overhead crane. The hoisting overhead crane is connected to the electrical unit.

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