Steel beam high-position beam dropping construction device

Abstract

The present application relates to the steel plate beam falling beam construction technical field, specifically relates to a kind of steel beam high-position falling beam construction device, mainly by advancing equipment, hoisting equipment, guide beam, steel plate beam, bridge span, bridge pier and roadbed are constituted, advancing equipment contains steel rail and multiple flat car, can travel on steel rail, for carrying steel plate beam and guide beam, hoisting equipment is made of portal jib, winch base, lever sling, portal jib is set on bridge span or roadbed, winch base cooperates with wire rope and pulley block hoisting lever sling, for the lifting and lowering of steel plate beam, guide beam is divided into front guide beam and rear guide beam, adopts triangular truss structure, and is welded with steel plate beam, and plays the role of orientation and lengthening.The device realizes the accurate, efficient and safe high-position falling beam construction of steel beam through the cooperative work of each component, especially suitable for high-altitude mountainous areas and other equipment shortage areas, with significant construction efficiency and cost advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate girder falling construction, in particular to a steel girder high-position falling construction device. BACKGROUND

[0002] In bridge construction, the installation of steel girders is one of the key links. Traditional construction methods include bridge erecting machine installation, crane direct hoisting, temporary pier auxiliary assembly, etc. However, in some special environments, such as high-altitude mountainous areas and equipment-lacking areas, conventional methods face many challenges. For example, in the Obigarm-Nurobod Project Section 2 of Tajikistan, the construction access is narrow and steep, the mid-span steel plate girder of No. 14 bridge is 63.8 m long and weighs 180 tons, the girder falling height is 5.4 m, the river channel is deep and wide, temporary piers cannot be set up, and large bridge erecting machines, cranes and other key equipment cannot be rented locally, which makes it difficult for conventional construction methods to meet the construction needs. SUMMARY

[0003] To solve the problem of lack of steel girder falling construction equipment in high-altitude mountainous areas and other areas, the present application provides a steel girder high-position falling construction device, which realizes long-distance pulling and pushing through the coordinated operation of the propulsion equipment, hoisting equipment, guide beam and lever hoist. The innovative design of the flat car solves the transposition problem through static friction and rolling friction conversion, improving efficiency. At the same time, the device has low cost, strong adaptability, and can flexibly adjust the counterweight to ensure stable construction and effectively meet the needs of steel girder high-position falling construction in special environments.

[0004] The technical problem solved by the present application is solved by the following scheme: a steel girder high-position falling construction device, propulsion equipment, hoisting equipment, guide beam, steel plate girder to be fallen, bridge span already constructed, bridge pier and roadbed, the guide beam is divided into front and rear guide beams, the whole guide beam adopts a triangular truss structure, and the front and rear guide beams are respectively welded to the two ends of the steel plate girder through temporary joint plates at their ends; the propulsion equipment includes steel rails and multiple flat cars, the steel rails are laid in the longitudinal direction of the roadbed and bridge span on both sides as the running track of the flat cars, and the flat cars run on the steel rails to carry the steel plate girder and guide beam; the hoisting equipment is composed of a portal crane, a winch base and a lever hoist, the portal crane is arranged on adjacent bridge spans or roadbeds, the winch base is arranged on the portal crane, the winch base cooperates with the pulley block through a steel wire rope to hoist the lever hoist, and the lever hoist is used to hoist the steel plate girder, after the steel plate girder is pushed into place, the lever hoist is welded to the end of the steel plate girder through the reinforced plate thereon, and the portal crane is used for girder falling construction to realize the lifting and lowering of the steel plate girder.

[0005] Further, the flat trolley is composed of two groups of wheel boxes and a load platform, a track wheel is installed in the wheel box, a motor with a brake device is arranged on the track wheel, the load platform is designed in a dish-shaped structure, support wheels are symmetrically installed on both sides of the load platform through wheel shafts, the rotating direction of the support wheels is consistent with the advancing direction of the track wheels, the bottom of the support wheels is in contact with the low surface of the load platform, the top of the support wheels is higher than the top surface of the load platform, and the support wheels are used for supporting the steel plate beam, and a linkage assembly for controlling the locking and unlocking of the support wheels is arranged on the flat trolley.

[0006] Further, a positioning gear is fixedly sleeved on the wheel shaft of the support wheel, horizontal plates are symmetrically arranged above and below the positioning gear, a plurality of guide columns are vertically fixed at the steps of the load platform, the horizontal plates are longitudinally and slidingly sleeved on the guide columns, and a rack is arranged on the horizontal plate at a position corresponding to the positioning gear, and the locking or unlocking of the support wheel is realized through the meshing or separation of the positioning gear and the rack.

[0007] Further, the linkage assembly comprises connecting rods and a push-pull rod, the connecting rods are hingedly connected to the front ends of the two horizontal plates and are arranged in a V shape, the outer ends of the two connecting rods are hingedly connected to the push-pull rod, a jacking plate is vertically fixed at the front end of the push-pull rod, when the jacking plate moves backward under an external force, the two horizontal plates are driven away from each other through the connecting rods to unlock the support wheels.

[0008] Further, a spring is sleeved on the guide column and is longitudinally connected between the upper and lower horizontal plates.

[0009] Further, pull rings are fixed at the front and rear of the flat trolley, the pull ring at the front is arranged on the jacking plate, and the adjacent flat trolleys between the front abutments are connected through the pull rings and pull ropes.

[0010] Further, the front guide beam adopts a triangular variable cross-section truss, the rear guide beam adopts a triangular constant cross-section truss, and a temporary joint plate is arranged at the transition between the end of the guide beam and the steel plate beam.

[0011] Further, during the advancing of the steel plate beam, a counterweight is added on the rear guide beam to balance the gravity center of the steel plate beam.

[0012] Further, the construction process of the device comprises:

[0013] S1, laying steel rails and flat trolleys, assembling a portal crane and anchoring it to the bridge deck;

[0014] S2, hoisting the steel plate beam to the flat trolley, installing the front and rear guide beams and welding them through the temporary joint plate;

[0015] S3, synchronously dragging the steel plate beam and the guide beams through the flat trolley, and real-time rectifying through the portal crane;

[0016] S4, when the flat trolley is blocked in the gantry crane, the supporting wheels of the flat trolley are automatically unlocked, so that the steel plate beam slides forward relative to the flat trolley;

[0017] S5, after the steel plate beam is advanced to the position, the lever hoist is installed and the guide beam is removed, and the steel plate beam is lowered to the design elevation by the hoisting equipment.

[0018] The beneficial effects of the present application are: improved construction efficiency: the present application forms a complete steel beam high-position beam falling construction system by setting the advancing equipment, hoisting equipment, guide beam, lever hoist and the like, the flat trolley can stably travel on the steel rail, long-distance dragging and jacking of the steel beam is realized, and in the dragging process, multi-point dragging and synchronous control operation are realized, effectively avoiding the twisting or stress concentration phenomenon of the steel beam due to the asynchronization of the trolley, and ensuring the stability and safety of the dragging process; the load platform of the flat trolley is designed in a dish-shaped structure, and is equipped with supporting wheels, positioning gears, cross plates, racks and the like, realizing the conversion of static friction and rolling friction, solving the transposition problem of the flat trolley at the gantry crane, and improving the construction efficiency; compared with the traditional construction method, the device does not need complex assembly and disassembly process, reduces the construction process, shortens the construction time, greatly improves the construction efficiency, and can effectively shorten the project period.

[0019] Reduced construction cost: the device is mainly composed of common materials such as section steel and steel pipe, and the processing cost is low, at the same time, the assembly and disassembly of the device are simple and convenient, reducing the loss of labor and equipment resources, in the utilization of materials, the guide beam and the steel plate beam adopt a triangular truss structure, which not only ensures the strength and rigidity of the structure, but also reduces the self weight, further reducing the material cost; compared with the traditional construction method, the steel beam high-position beam falling construction device of the present application can significantly save the construction cost, and the economic benefit is remarkable.

[0020] Strong adaptability and wide application range: the steel beam high-position beam falling construction device of the present application is specially designed for bridge construction in high-altitude mountainous areas and equipment-deficient areas, and can meet the construction requirements in complex terrain and harsh environment; the device does not need large equipment, and can complete the construction through simple assembly and disassembly, and has strong adaptability to the construction environment, at the same time, the device can be flexibly adjusted and optimized according to different bridge span, beam height and weight parameters, and is suitable for steel plate beam dragging construction with large span and large self weight in high-altitude mountainous area highway engineering which lacks various large mechanical equipment, and has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a three-dimensional structure schematic view of the present application;

[0022] Figure 2 is a steel rail laying position schematic view of the present application;

[0023] Figure 3The schematic diagram of the guide beam and portal crane structure of the present application;

[0024] Figure 4 The schematic diagram of the guide beam and steel plate beam structure of the present application;

[0025] Figure 5 The schematic diagram of the steel plate beam pushing of the present application;

[0026] Figure 6 The schematic diagram of the steel plate beam pushing of the present application;

[0027] Figure 7 The schematic diagram of the portal crane structure of the present application;

[0028] Figure 8 The schematic diagram of the lever hoist and steel plate beam cooperation of the present application;

[0029] Figure 9 The schematic diagram of the steel plate beam and guide beam cooperation structure of the present application;

[0030] Figure 10 The schematic diagram of the flat trolley and steel plate beam structure of the present application;

[0031] Figure 11 The schematic diagram of the flat trolley structure of the present application;

[0032] Figure 12 The schematic diagram of the flat trolley state change of the present application;

[0033] Figure 13 The schematic diagram of the flat trolley running of the present application;

[0034] Figure 14 The construction flow chart of the present application.

[0035] In the figure: 1, steel plate beam; 2, guide beam; 201, temporary joint plate; 3, bridge pier; 4, bridge span; 5, portal crane; 6, lever hoist; 601, reinforced plate; 7, flat trolley; 701, wheel box; 702, track wheel; 703, load platform; 704, supporting wheel; 705, positioning gear; 706, guide column; 707, cross plate; 708, rack; 709, spring; 710, connecting rod; 711, push-pull rod; 712, pushing plate; 713, pull ring; 714, wheel shaft; 8, counterweight; 9, roadbed; 10, winch base; 11, steel rail. DETAILED DESCRIPTION

[0036] The present application is further illustrated below in conjunction with the drawings and examples.

[0037] Please refer to Figures 1-14 The present application provides a technical scheme of a steel beam high-position falling beam construction device:

[0038] Embodiment One: According to Figures 1-6 As shown in the drawings, a steel beam high-position beam falling construction device mainly includes a pushing device, a hoisting device, a guide beam 2, a steel plate beam 1 to be fallen, a bridge span 4 that has been constructed, a bridge pier 3, a roadbed 9, and the like. The guide beam 2 is divided into a front guide beam and a rear guide beam, and the guide beam 2 as a whole adopts a triangular truss structure, is welded and connected with the steel plate beam 1 through a temporary joint plate 201 at the end thereof, and plays a role of lengthening the length of the steel plate beam 1 and guiding. The pushing device includes a steel rail 11 and a plurality of flat trolley 7, the steel rail 11 is laid in the longitudinal direction of the roadbed 9 and the bridge span 4 on both sides, serves as a running track of the flat trolley 7, the flat trolley 7 contains a wheel set, a speed reducer and a motor, can run on the steel rail 11, and is used for carrying the steel plate beam 1 and the guide beam 2. The hoisting device is composed of a portal crane 5, a winch base 10, a lever hoist 6 and a hoisting mechanism at the construction site, the portal crane 5 is arranged on the adjacent bridge span 4 or roadbed 9 respectively, a plurality of winch bases 10 are arranged on the portal crane 5, the lever hoist 6 is hoisted through cooperation of a steel wire rope and a pulley block, the lever hoist 6 is composed of a truss, a reinforced plate 601 and an I-beam, after the steel plate beam 1 is pushed to the position, the lever hoist 6 is connected with the end of the steel plate beam 1 through the reinforced plate 601, cooperates with the portal crane 5 for beam falling construction, and realizes hoisting and lowering of the steel plate beam 1.

[0039] The specific structure of the portal crane 5 is shown in Figure 7 The portal crane 5 is 5.5m-12m long and 7.5m-9m high, includes an upper cross beam, a lower cross beam, a stand, a horizontal link and an inclined support, and each component is assembled by double-spliced I-beams. The double-spliced I50b beams form the upper cross beam and the lower cross beam, the double-spliced I50b beams serve as the stand, the horizontal link and the inclined support are made of double-spliced I25b beams, the portal crane 5 is fixed to the bridge deck of the bridge span 4 through U-shaped bolts, the winch base 10 is welded to the top, six sets of fixed pulleys are arranged at the center of the winch base 10, seven sets of movable pulleys are arranged at the hoisting hook of the portal crane 5, the hoisting capacity of the portal crane is not less than 110 tons, and the portal crane is used for hoisting the steel plate beam 1 when the trolley is transposed and the beam is fallen. The reinforced rib plate is added at the connection between the stand and the cross beam of the portal crane 5, the stiffness and bearing capacity of the node are improved, the overall stability of the portal crane is enhanced, the anchoring of the foundation of the portal crane is strengthened, the foundation is expanded or the number of anchoring steel bars is increased, and it is ensured that the portal crane does not incline or displace during the construction process.

[0040] The lever hoist 6 adopts a triangular truss with a length of 9m and a height of 2m, forms the reinforced plate 601 through three 10mm-thick steel plates and two double-spliced I25b beams, and is connected with the steel plate beam 1 through the reinforced plate 601, as shown in Figure 8As shown, the truss of the lever hanger 6 is connected with the steel plate beam 1 for 5.48 m, and the overhanging part is 3.42 m long. An adjustable device is arranged at the connecting position of the lever hanger 6 and the steel plate beam 1, and the stress angle and the overhanging length of the lever hanger 6 can be finely adjusted according to the stress condition of the steel plate beam 1 at different construction stages and the beam falling height requirement. The stress state of the lever hanger 6 is adjusted, so that the lever hanger 6 always maintains the best working performance during the beam falling process, and the steel beam is ensured to be stably and accurately fallen to the designed position.

[0041] The flat trolley 7 is 2.5 m long and 8 m wide, and is composed of two groups of wheel boxes 701 and load platforms 703. The track wheels 702 are arranged in the wheel boxes 701, the diameter of the track wheels 702 is 0.4 m, a 2.2 kW motor with a brake device is arranged, the motor is powered by a 250 kW generator, and the average driving speed is 6 m / h. In order to improve the synchronization and precision of the flat trolley 7 during the pulling process, an advanced synchronous control system is adopted. The system can monitor the running speed and position of each flat trolley 7 in real time through a sensor, and can accurately control the motor through a controller, so that all the flat trolleys 7 can be ensured to advance or retreat synchronously, and the phenomenon of distortion or stress concentration of the steel beam caused by the asynchronization of the trolleys during the pulling process can be effectively avoided.

[0042] The front guide beam is 33 m long, and is a triangular variable cross-section truss with a height of 2 m and a bottom of 1 m. The rear guide beam is 44 m long, and is a triangular constant cross-section truss with a height of 2 m and a bottom of 1 m. The guide beam 2 is assembled by means of bolted connection in sections, the length meets 0.6-0.8 times of the pulling span, and a temporary joint plate 201 is arranged at the transition between the end of the guide beam 2 and the steel plate beam 1, as shown in the figure, and the first section of the guide beam 2 close to the steel plate beam 1 is strengthened. Figure 9 As shown, the first section of the guide beam 2 close to the steel plate beam 1 is strengthened. In addition to the welding of the temporary joint plate 201, high-strength bolt connection is also added at the connecting position of the guide beam 2 and the steel plate beam 1. The high-strength bolt and the weld seam jointly act, so that the strength and rigidity of the connection can be improved, the integrity between the guide beam 2 and the steel plate beam 1 can be enhanced, and the two can work better in the pulling and stress process, so that the reliability and safety of the structure can be improved.

[0043] The construction process of the steel beam high-position beam falling construction device is as follows:

[0044] S1, construction preparation: before construction, according to the actual situation on site, the assembling site of the steel plate beam 1 and the guide beam 2 is reasonably planned, so that the site is ensured to be flat and solid, and good construction conditions are provided; at the same time, according to the requirements of the design drawing, the flat trolley 7 is processed and assembled, so that the size, performance and quality of the flat trolley 7 meet the construction requirements, the track foundation is poured, and the steel rail 11 is laid. The steel rail 11 is made of 30 kg / m I-shaped steel, the foundation is made of C30 concrete strip foundation, and the stability and bearing capacity of the track are ensured.

[0045] S2, Assemble the portal crane: according to the design drawings and the actual situation on site, the size and component specifications of the portal crane 5 are calculated and determined, and during the assembly process, the assembly process and quality standards are strictly followed to ensure the installation accuracy and quality of the portal crane. After the portal crane is assembled, it is fixed with the side span bridge deck using U-bolts, 12 bolt holes with a diameter of 5 cm are reserved on the bridge deck, 42 groups of U-bolts are used to fasten the bottom cross beam, 22 groups of U-bolts are used to fasten the bottom longitudinal beam, and rubber pads are laid between the bolts and the bridge deck to prevent damage to the bridge deck concrete. At the same time, the winch base 10 is welded on the top of the portal crane, six groups of fixed pulleys are arranged in the center of the winch base 10, and seven groups of movable pulleys are arranged at the portal crane hook to ensure the lifting capacity and stability of the portal crane.

[0046] S3, Assemble the steel plate girder: the assembly of the steel plate girder 1 is carried out on a special platform. During the assembly process, the pre-camber is set according to the design requirements to ensure the shape and size accuracy of the steel plate girder 1. After assembly, the steel plate girder 1 is thoroughly inspected and debugged to ensure that its quality and performance meet the construction requirements. Finally, the assembled steel plate girder 1 is lifted onto the flat car 7 using the on-site crane to prepare for the subsequent pulling and pushing construction.

[0047] S4, Install the front and rear guide beams: the front and rear guide beams are assembled using the segmented bolt connection method. During the installation process, the length of the guide beam 2 should be 0.6-0.8 times the pulling span to ensure that the guide beam 2 has sufficient stiffness and strength. Temporary joint plates 201 are arranged at the transition between the guide beam 2 and the steel plate girder 1, and are connected using welding. The first section of the guide beam 2 that is closest to the steel plate girder 1 is reinforced to improve the connection strength and integrity between the guide beam 2 and the steel plate girder 1.

[0048] S5, Pull and push: During the pulling process, rubber pads are used as cushioning material between the steel plate girder 1 and the flat car 7 to prevent local stress exceeding the standard due to improper support. When the front end of the guide beam 2 reaches and is supported by the front pier 3, the flat car 7 arranged on the pier is promptly involved in the pulling operation to realize multi-point pulling and improve the stability and safety of the pulling process. At the same time, the synchronization of the flat cars 7 is centrally controlled, and the speed, position, and other parameters of the cars during the pulling process are monitored, pre-controlled, and adjusted in real time to ensure that all flat cars 7 move forward or backward synchronously. During pulling, the beam body is kept moving at a constant speed, and symmetry and synchronization at each point are maintained. Deviations in the lateral and vertical directions of the beam body are promptly corrected to ensure that the stress and deformation are always within the allowable range of design or construction monitoring. During the pulling process, the portal crane 5 is used as a guide device to prevent the beam body from deviating, and real-time construction monitoring is carried out on the axial position of the beam body, the deformation of the pier, the deflection and stress change of the main beam and the guide beam 2 control section. Once an abnormal situation occurs, the pulling is immediately stopped, the cause is identified and handled before the construction can continue.

[0049] S6, trolley transposition: when the frontmost flat trolley 7 reaches the position of the portal crane 5 and cannot continue to move forward, the portal crane is used to lift the steel plate beam 1 by 3-5 cm, and then the flat trolley 7 is moved backward, and the process is repeated until the steel plate beam 1 completes the hole.

[0050] S7, remove the guide beam and install the lever hoist: after being dragged into position, first install the lever hoist 6 at appropriate positions on both sides of the steel plate beam 1, and connect them through the stiffened plate 601 to ensure the firmness and reliability of the connection. The connection part of the lever hoist 6 with the main beam is 5.48 m long, and the overhanging part is 3.42 m long. After installation is complete, remove the front and rear guide beams 2 to create conditions for subsequent beam lowering construction.

[0051] S8, lower the beam to the design elevation: use the portal crane support synchronous beam lowering method to slowly lower the steel plate beam 1 to the design elevation, with a beam lowering height of 5.4 m. During the beam lowering process, according to the stress condition of the steel plate beam 1, control the portal crane behind the pier to simultaneously lift the lever hoist 6, and slowly and evenly lower the beam in batches on both sides to ensure that the height difference of the beams at each pier top is not greater than 20 mm. During the entire beam lowering process, closely monitor the stress state and deformation of the steel plate beam 1 to ensure that the beam lowering process is smooth, safe, and accurate.

[0052] S9, remove the portal crane and the lever hoist: after the beam lowering is complete, remove the portal crane and the lever hoist 6 in sequence, and properly transport them to the designated location for storage or use in the next stage of construction. During the removal process, pay attention to protecting the integrity and safety of each component to avoid damage or loss.

[0053] Example Two: The scheme provided in Example One requires transposition of the trolley when the flat trolley 7 reaches the position of the portal crane 5, and requires multiple times of lifting the steel plate beam 1 to control the trolley to move backward, which seriously affects the construction efficiency. In order to solve this problem, the flat trolley 7 is improved in this example.

[0054] On the basis of Example One, the same parts of this example as Example One will not be repeated, and the differences are as follows: as shown in Figures 10-13 Fig. 6, the load platform 703 of the flat trolley 7 is designed in a pot-shaped structure. Symmetrical support wheels 704 are installed on both sides of the load platform 703 through the wheel shaft 714. The rotation direction of the support wheel 704 is consistent with the forward direction of the track wheel 702. The bottom of the support wheel 704 is in contact with the low surface of the load platform 703, and the height of the support wheel 704 is slightly higher than the top surface of the load platform 703. After the steel plate beam 1 is placed on the flat trolley 7, it is supported by the support wheel 704.

[0055] The positioning gear 705 is fixed on the wheel shaft 714 of the supporting wheel 704, and the upper and lower horizontal plates 707 are symmetrically arranged in parallel above and below the positioning gear 705. A plurality of guide columns 706 are vertically fixed at the steps of the load platform 703, and the horizontal plates 707 are longitudinally slidably sleeved on the guide columns 706. The rack 708 is arranged on the horizontal plate 707 at a position corresponding to the positioning gear 705. The spring 709 is sleeved on the guide column 706, and the upper and lower ends of the spring 709 are connected to the upper and lower horizontal plates 707, respectively. When the upper and lower horizontal plates 707 move close to each other, the rack 708 on the horizontal plate 707 can be engaged and clamped on the positioning gear 705 to lock the positioning gear 705, thereby locking the wheel shaft 714 and the supporting wheel 704 so that the supporting wheel 704 cannot rotate. At this time, the static friction exists between the steel plate girder 1 or the guide beam 2 and the platform trolley 7. When the upper and lower horizontal plates 707 move away from each other, the rack 708 on the horizontal plate 707 moves away from the positioning gear 705, and the wheel shaft 714 and the supporting wheel 704 are in an unlocked state, so that the supporting wheel 704 can rotate freely. At this time, the rolling friction exists between the steel plate girder 1 or the guide beam and the platform trolley 7.

[0056] The linkage assembly for controlling the relative movement of the upper and lower horizontal plates 707 is arranged on the platform trolley 7, which specifically includes two connecting rods 710 hingedly connected at the front ends of the two horizontal plates. The two connecting rods 710 are arranged in a V shape, and the outer ends of the two connecting rods 710 are hingedly connected to the same push-pull rod 711. The push plate 712 is vertically fixed at the front end of the push-pull rod 711. In the normal advancing state of the platform trolley 7, the two horizontal plates 707 move close to each other, the positioning gear 705 is engaged with the rack 708, and the supporting wheel 704 is in a locked state. At this time, the platform trolley 7 advances to drive the steel plate girder and the guide beam 2 to advance forward, and the static friction exists between the steel plate girder 1 and the platform trolley 7. The friction force is large, which can effectively transmit power and ensure the stable advancement of the steel plate girder 1. When the platform trolley 7 contacts the portal crane 5 at the rear pier and cannot move forward any more, the interaction force between the portal crane 5 and the platform trolley 7 pushes the push plate 712 to move backward. Under the linkage cooperation of the connecting rods 710, the two horizontal plates 707 move away from each other to unlock the supporting wheel 704. At this time, the supporting wheel 704 is in a free state, and the rear platform trolley 7 continues to advance the steel plate girder 1 and the guide beam 2. The platform trolley 7 which is blocked and cannot move forward changes from static friction to rolling friction with the steel plate girder or the guide beam 2 under the cooperation of the supporting wheel 704. Because the rolling friction is small, the steel plate girder 1 or the guide beam 2 can slide relative to the platform trolley 7 to continue to advance forward. Therefore, even if the portal crane blocks the platform trolley 7 from moving forward, the rotation of the free supporting wheel 704 on the trolley can also not affect the advancement of the steel plate girder 1. With the advancement of the steel plate girder 1, the rear platform trolley 7 also contacts the platform trolley 7 which has stopped advancing in front and provides a force to automatically unlock the rear platform trolley 7. In this way, the platform trolley 7 does not need to be repositioned and retreated, and the advancement of the steel plate girder 1 can also be smoothly completed.

[0057] Example 3: Based on Example 2, such as Figure 13 As shown, pull rings 713 are fixed at both the front and rear of the flatbed trolley 7. The front pull ring 713 is set on the push plate 712, and the rear pull ring 713 is set on the load platform 703 of the flatbed trolley 7. When the flatbed trolley 7 provided in Embodiment 2 is used, the flatbed trolleys 7 at the front pier 3, before receiving the steel plate beam 1, are sequentially gathered in front of the gantry crane 5 at the front pier. Except for the farthest flatbed trolley 7 which is in a locked state, the other flatbed trolleys 7 are in an unlocked state. Moreover, adjacent flatbed trolleys 7 are connected by pull rings 713 and pull ropes. The length of the pull ropes is the spacing between the flatbed trolleys 7 at the front pier. After the guide beam 2 is advanced to the front pier 3, it will pass through the unlocked flatbed trolley 7 with the rolling cooperation of the support wheel 704 until it contacts the farthest locked flatbed trolley 7. The static friction between the farthest flatbed trolley 7 and the steel plate beam 1 causes them to move forward synchronously. As the flatbed trolley 7 moves forward, it will pull the push plate 712 on the rear flatbed trolley 7 forward through the pull rope, locking the support wheel 704 of the rear flatbed trolley 7, until all the flatbed trolleys 7 at the front pier 3 are locked, thus realizing the advancement of the steel plate beam 1 and the guide beam 2.

[0058] By using this connection method of pull ring 713 and pull rope, it is possible to ensure that the flatbed trolley 7 at the front pier is locked sequentially at the appropriate time, forming stable support and propulsion force, which further improves the stability and controllability of the steel plate beam 1 propulsion process, while reducing manual intervention and improving the automation and efficiency of construction.

[0059] Example 4: Based on Example 1, during the advancement process, a counterweight 8 can be added to the rear guide beam 2 at any time to balance the center of gravity of the steel beam. The counterweight 8 on the rear guide beam 2 can be adjusted according to the position of the center of gravity of the steel beam and the construction conditions. In addition to using precast concrete blocks as counterweights, other heavy objects available on site can also be used as counterweights 8 to better balance the center of gravity of the steel beam and ensure stability during construction.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel beam high-position beam dropping construction device, comprising a pushing device, a hoisting device, a guide beam (2), a steel plate beam (1) to be dropped for construction, a bridge span (4) that has been constructed, a pier (3) and a roadbed (9), characterized in that, The guide beam (2) is divided into front and rear guide beams, and the whole guide beam (2) adopts a triangular truss structure, and the front and rear guide beams are welded with the steel plate beam (1) at both ends through temporary joint plates (201) at the ends thereof; the propelling device comprises a steel rail (11) and a plurality of flat trolley (7), the steel rail (11) is laid in the longitudinal direction of the bridge span (4) and the roadbed (9) on both sides as a running track of the flat trolley (7), the flat trolley (7) runs on the steel rail (11) and is used for carrying the steel plate beam (1) and the guide beam (2); the hoisting device is composed of a portal crane (5), a winch base (10) and a lever hoist (6), the portal crane (5) is arranged on the adjacent bridge span (4) or roadbed (9), the winch base (10) is arranged on the portal crane (5), the winch base (10) is matched with the pulley block through the steel wire rope to hoist the lever hoist (6), the lever hoist (6) is used for hoisting the steel plate beam (1), after the steel plate beam (1) is propelled into place, the lever hoist (6) is welded with the end of the steel plate beam (1) through the reinforced plate (601) thereon, and the beam lowering construction is cooperated with the portal crane (5) to realize the lifting and lowering of the steel plate beam (1); The flat trolley (7) is composed of two groups of wheel boxes (701) and a load platform (703), track wheels (702) are arranged in the wheel boxes (701), motors with braking devices are arranged on the track wheels (702), the load platform (703) is designed in a D-shaped structure, support wheels (704) are symmetrically arranged on both sides of the load platform (703) through wheel shafts (714), the rotation direction of the support wheels (704) is consistent with the forward direction of the track wheels (702), the bottom of the support wheels (704) is in contact with the low surface of the load platform (703), the top of the support wheels (704) is higher than the top surface of the load platform (703), and the support wheels (704) are used for supporting the steel plate beam (1), and the flat trolley (7) is provided with a linkage assembly for controlling the locking and unlocking of the support wheels (704).

2. The steel beam high-position beam dropping construction device according to claim 1, characterized in that, A positioning gear (705) is fixedly sleeved on the wheel shaft (714) of the support wheel (704), horizontal plates (707) are symmetrically arranged above and below the positioning gear (705), a plurality of guide columns (706) are vertically fixed at the steps of the load platform (703), the horizontal plates (707) are longitudinally slidably sleeved on the guide columns (706), and a rack (708) is arranged at a position corresponding to the positioning gear (705) on the horizontal plate (707), and the positioning gear (705) and the rack (708) realize the locking or unlocking of the support wheel (704) through meshing or disengaging.

3. The steel beam high-position beam dropping construction device according to claim 2, characterized in that, The linkage assembly comprises connecting rods (710) and a push-pull rod (711), the connecting rods (710) are hinged at the front ends of two cross plates (707) and are arranged in a V shape, the outer ends of the two connecting rods (710) are hinged on the push-pull rod (711), and a pushing plate (712) is vertically fixed at the front end of the push-pull rod (711); when the pushing plate (712) is moved backward under an external force, the two cross plates (707) are driven to move away from each other by the connecting rods (710) to unlock the supporting wheels (704).

4. The steel beam high-position beam dropping construction device according to claim 2, characterized in that, The guide column (706) is sleeved with a spring (709), and the spring (709) is longitudinally connected between the upper and lower cross plates (707).

5. The steel beam high-position beam dropping construction device according to claim 3, characterized in that, The front and rear of the flat trolley (7) are fixed with pull rings (713), the pull ring (713) at the front is arranged on the pushing plate (712), and the adjacent flat trolleys (7) at the front bridge pier are connected through the pull ring (713) and a pull rope.

6. The steel beam high-position beam dropping construction device according to claim 1, characterized in that, The front guide beam adopts a triangular variable cross-section truss, the rear guide beam adopts a triangular constant cross-section truss, and a temporary joint plate (201) is arranged at the transition between the end of the guide beam (2) and the steel plate beam (1).

7. The steel beam high-position beam dropping construction device according to claim 1, characterized in that, During the advancing process of the steel plate beam (1), a counterweight (8) is added on the rear guide beam to balance the gravity center of the steel plate beam (1).

8. The steel beam high-position beam dropping construction device according to claim 1, characterized in that, The construction process of the device comprises: S1, laying steel rails (11) and flat trolleys (7), assembling a portal jib (5) and anchoring it to the bridge deck; S2, hoisting the steel plate beam (1) to the flat trolley (7), installing the front and rear guide beams (2) and welding through the temporary joint plate (201); S3, synchronously dragging the steel plate beam (1) and the guide beam (2) through the flat trolley (7), and real-time rectifying deviation by using the portal jib (5); S4, when the flat trolley (7) is blocked by the portal jib (5), the supporting wheels (704) of the flat trolley (7) are automatically unlocked, so that the steel plate beam (1) slides forward relative to the flat trolley (7); S5, after the steel plate beam (1) is advanced to the position, a lever hoist (6) is installed and the guide beam (2) is removed, and the steel plate beam is lowered to the designed elevation by using a hoisting device.

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