Hoisting equipment for box girder in bridge construction

Abstract

The invention discloses hoisting equipment for a box girder in bridge construction, which comprises two longitudinal guide rails mounted at the lower end of an assembly frame side by side along the transverse direction of a bridge, two wheel set type migration mechanisms mounted between the two longitudinal guide rails in a spaced sliding manner along the length direction of the longitudinal guide rails, and a winch type tensioning mechanism connected between the two wheel set type migration mechanisms, a first steel wire rope is wound on the winch type traction mechanism installed at one end of the assembly frame, the two ends of the first steel wire rope are connected with the ends, away from each other, of the two wheel set type migration mechanisms respectively, the hoisting mechanism is in transmission connection with the two wheel set type migration mechanisms, and walking wheel sets are installed on the two sides of the two ends of the assembly frame respectively. The box girder hoisting stability can be effectively improved, the alignment accuracy of the lower end of the box girder and the upper end of the pier is ensured, the situation that the box girder shakes, swings or inclines in the hoisting process is avoided, and the construction efficiency is improved. The device is suitable for the technical field of box girder lifting and aligning in bridge construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction equipment. Specifically, it relates to a hoisting device for box girders in bridge construction. Background Art

[0002] At present, during the construction of bridges, after the piers are poured and cured, two methods are used for the construction operation of box girders. The first construction operation method is to bind the steel bar skeletons between the piers. After the binding is completed, with the use of formworks, the concrete pouring operation is carried out to form a continuous bridge. After the pouring is completed, the curing operation is carried out; this method has a long construction period, and often due to environmental factor interference, the situation of low local strength of the bridge occurs. The second construction operation method is that the bridge is prefabricated, generally applicable to box girders; the box girder is lifted by a hoisting device and spliced between the piers. Then, the box girder is connected to the piers through connectors, and the steel bars between the box girders are bound and poured; this method has a shorter construction period and is less affected by environmental factors; however, during the lifting and position alignment of the box girder, the box girder will have a certain degree of shaking, swinging or tilting, and it is very easy to have inaccurate alignment. It requires manual observation and adjustment, and more seriously, safety accidents such as hitting the piers or injuring construction workers may occur. Summary of the Invention

[0003] The present invention provides a hoisting device for box girders in bridge construction, which is used to improve the stability of box girder hoisting, ensure the accuracy of the alignment between the lower end of the box girder and the upper end of the pier, avoid situations such as shaking, swinging or tilting of the box girder during hoisting, and improve the construction efficiency.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows: A hoisting device for box girders in bridge construction includes two longitudinal guide rails arranged side by side along the transverse direction of the bridge at the lower end of the assembly frame. Two wheel group type transporting mechanisms are slidably installed at intervals along the length direction between the two longitudinal guide rails. A winch type tensioning mechanism is connected between the two wheel group type transporting mechanisms. A winch type pulling mechanism installed at one end of the assembly frame winds a first steel wire rope. The two ends of the first steel wire rope are respectively connected to the mutually remote ends of the two wheel group type transporting mechanisms. A hoisting mechanism is in transmission connection with the two wheel group type transporting mechanisms. Traveling wheel groups are respectively installed on both sides at both ends of the assembly frame.

[0005] Furthermore, the assembly frame includes two longitudinal beams arranged side by side along the transverse direction of the bridge. The two longitudinal beams are connected by multiple first transverse beams, and these first transverse beams are arranged at intervals along the length direction of the longitudinal beams. Along each longitudinal beam, multiple pairs of vertical rods are connected at intervals along its length direction. At the lower ends of each pair of vertical rods, an assembly buckle seat is fixed, and the assembly buckle seat is detachably connected to the corresponding longitudinal guide rail. The two longitudinal guide rails are connected by multiple second transverse beams, and these second transverse beams are arranged at intervals along the length direction of the longitudinal guide rails.

[0006] Furthermore, the longitudinal guide rail includes a guide rail body with an upper wire guide groove and a lower wire guide groove respectively formed at its upper and lower ends. The upper wire guide groove and the lower wire guide groove respectively extend out of both ends of the guide rail body along the length direction of the guide rail body. A guide wheel is installed at one end of the guide rail body away from the winch pulling mechanism. One end of the first steel wire rope enters the lower wire guide groove through the upper wire guide groove via the guide wheel, and is connected to the corresponding wheel group type moving mechanism. The other end of the first steel wire rope is connected to another wheel group type moving mechanism through the lower wire guide groove.

[0007] Furthermore, the wheel group type moving mechanism includes two first sliding seats arranged side by side and respectively slidingly connected to the two longitudinal guide rails. The number of the first steel wire ropes is two, and these two first steel wire ropes are arranged side by side. The same-side ends of the two first steel wire ropes are respectively connected to the two first sliding seats.

[0008] Furthermore, two first assembly wheel seats are installed at intervals along the transverse direction of the bridge at the lower ends of each of the first sliding seats. Multiple first driving wheels are rotatably installed at intervals along the length direction of the longitudinal guide rail on each of the first assembly wheel seats.

[0009] Furthermore, the lifting mechanism includes two lifting winches arranged between the two wheel group type moving mechanisms. A first double-shaft motor is arranged between the two lifting winches. The two output shafts of the first double-shaft motor are respectively coaxially connected to the two lifting winches. Two second steel wire ropes are wound on each of the lifting winches. The two ends of each second steel wire rope respectively pass through two first assembly wheel seats on the same side of the two wheel group type moving mechanisms. The second steel wire rope passes through each first driving wheel in a undulating form, and a lifting hook is connected to the end of the second steel wire rope.

[0010] Furthermore, the winch tensioning mechanism includes two tensioning winches arranged between the two wheel group type moving mechanisms. A second double-shaft motor is arranged between the two tensioning winches. The two output shafts of the second double-shaft motor are respectively coaxially connected to the two tensioning winches. A third steel wire rope is wound on each of the tensioning winches. The two ends of the third steel wire rope are respectively connected to the mutually approaching ends of the two first sliding seats on the same side of the two wheel group type moving mechanisms.

[0011] Further, an adjustable anti-shake mechanism is installed on each of the first sliding seats, and the end of the second steel wire rope passes through the adjustable anti-shake mechanism and extends downward.

[0012] Further, the adjustable anti-shake mechanism includes a connecting rod with one end connected to the first sliding seat. An adjusting arm is hinged to the other end of the connecting rod. A mounting seat is hinged to the end of the adjusting arm away from the connecting rod. A guiding seat is connected to the mounting seat. Two rotating rod groups are arranged side by side along the length direction of the bridge on the guiding seat. Each rotating rod group includes a plurality of rotating rods arranged at intervals in the vertical direction. The two ends of the adjusting oil cylinder are respectively hinged to the first sliding seat and the adjusting arm. The second steel wire rope passes through the gap between the two rotating rod groups, or the second steel wire rope passes through each rotating rod in a fluctuating form through one of the rotating rod groups.

[0013] Further, a guiding mechanism is installed at one end of each longitudinal guide rail close to the winch pulling mechanism. The guiding mechanism includes a connecting seat constructed at the end of the longitudinal guide rail. Two first guide wheel groups are installed at intervals in the vertical direction on the connecting seat. Each first guide wheel group includes a plurality of first guide wheels rotatably arranged at intervals along the length direction of the longitudinal guide rail. Second mounting wheel seats are detachably connected to the upper and lower ends of the connecting seat respectively. A second guide wheel group is installed on the second mounting wheel seat. The second guide wheel group includes a plurality of second guide wheels rotatably arranged at intervals along the length direction of the longitudinal guide rail. Each end of the first steel wire rope passes through the gap between the corresponding first guide wheel group and the second guide wheel group.

[0014] Due to the adoption of the above structure, compared with the prior art, the technical progress achieved by the present invention is as follows: The present invention realizes the walking of the entire hoisting device on the bridge through the traveling wheel group, and realizes the construction of hoisting and assembling the box girder for different segments of the bridge. The present invention winds and unwinds one end of the first steel wire rope through the winch pulling mechanism, and winds the other end of the first steel wire rope, so that the two wheel group type moving mechanisms move synchronously along the length direction of the longitudinal guide rail. Furthermore, the box girder lifted by the hoisting mechanism moves along the longitudinal guide rail. And the tension degree of the connection between the two wheel group type moving mechanisms is adjusted through the winch tensioning mechanism, so that while the two move synchronously, the situation of the box girder shaking and swinging due to the jerks during the movement is avoided. Moreover, the present invention can adjust the distance between the two wheel group type moving mechanisms through the winch tensioning mechanism, thereby realizing the hoisting of box girders of different models by the hoisting mechanism and ensuring the stability of the hoisted box girder. At the same time, the hoisting mechanism hoists the box girder through the transmission of the two wheel group type moving mechanisms, making the hoisting of the box girder smoother and more stable. To sum up, the present invention can effectively improve the stability of the box girder hoisting, and ensure the accuracy of the alignment between the lower end of the box girder and the upper end of the pier, avoid the situation of the box girder shaking, swinging or tilting during the hoisting process, and improve the construction efficiency. Description of the Drawings

[0015] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the description. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0016] In the accompanying drawings: Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic structural diagram of another angle of an embodiment of the present invention; Figure 3 is a side view of the structure of an embodiment of the present invention; Figure 4 is a partial schematic structural diagram of the connection between two longitudinal guide rails and two guiding mechanisms in an embodiment of the present invention; Figure 5 is a front view of the structure of the guiding mechanism in an embodiment of the present invention; Figure 6 is a partial schematic structural diagram of the connection between a winch-type tensioning mechanism, a hoisting mechanism and two longitudinal guide rails in an embodiment of the present invention; Figure 7 is a partial schematic structural diagram of the connection between a wheel set type transportation mechanism, an adjustable anti-vibration mechanism and a hoisting mechanism in an embodiment of the present invention; Figure 8 is a schematic structural diagram of the split of a wheel set type transportation mechanism and an adjustable anti-vibration mechanism in an embodiment of the present invention; Figure 9 is a side view of the structure in which the second steel wire passes through the adjustable anti-vibration mechanism in a straight line in an embodiment of the present invention; Figure 10 is a side view of the structure in which the second steel wire passes through the adjustable anti-vibration mechanism in a undulating form in an embodiment of the present invention; Figure 11 is a schematic structural diagram of the connection between a traveling wheel set and an assembly frame in an embodiment of the present invention; Figure 12 is Figure 11 an exploded view of the structure shown.

[0017] Labeled components: 100 - assembly rack, 101 - longitudinal beam, 102 - vertical rod, 103 - assembly buckle seat, 200 - longitudinal guide rail, 201 - guide rail body, 202 - upper wire rope groove, 203 - lower wire rope groove, 204 - second transverse beam, 205 - guide wheel, 300 - wheel - type transportation mechanism, 301 - first sliding seat, 302 - connecting wing, 303 - first assembly wheel seat, 304 - first driving wheel, 400 - winch - type pulling mechanism, 401 - pulling winch drum, 402 - driving sprocket, 403 - first steel wire rope, 500 - winch - type tensioning mechanism, 501 - tensioning winch drum, 502 - second double - shaft motor, 503 - third steel wire rope, 600 - lifting mechanism, 601 - lifting winch drum, 602 - second steel wire rope, 603 - first double - shaft motor, 604 - lifting hook, 700 - adjustable anti - vibration mechanism, 701 - connecting rod, 702 - adjusting arm, 703 - assembly seat, 704 - adjusting oil cylinder, 705 - guide seat, 706 - rotating rod, 800 - guiding mechanism, 801 - second assembly wheel seat, 802 - second guide wheel, 803 - connecting seat, 804 - first guide wheel, 900 - traveling wheel set, 901 - half - buckle seat, 902 - vertical buckle groove, 903 - traveling wheel seat, 904 - traveling wheel, 1000 - second sliding seat. Detailed implementation mode

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0019] The present invention discloses a hoisting device for box girders in bridge construction, as Figures 1-12As shown in the figure, it includes an assembly rack 100, a winch-type tensioning mechanism 500, a hoisting mechanism 600, a winch-type pulling mechanism 400, two longitudinal guide rails 200 and two wheel-group type transporting mechanisms 300. Among them, the two longitudinal guide rails 200 are installed side by side along the transverse direction of the bridge at the lower end of the assembly rack 100. The two wheel-group type transporting mechanisms 300 are slidably installed between the two longitudinal guide rails 200, and the two wheel-group type transporting mechanisms 300 are arranged at intervals along the length direction of the longitudinal guide rails 200. The winch-type tensioning mechanism 500 is connected between the two wheel-group type transporting mechanisms 300. The winch-type pulling mechanism 400 of the present invention is installed at one end of the assembly rack 100. The first steel wire rope 403 is wound on the winch-type pulling mechanism 400, and both ends of the first steel wire rope 403 are respectively connected to the mutually remote ends of the two wheel-group type transporting mechanisms 300. The hoisting mechanism 600 of the present invention is in transmission connection with the two wheel-group type transporting mechanisms 300, and traveling wheel groups 900 are respectively installed on both sides at both ends of the assembly rack 100. The working principle and advantages of the present invention are as follows: The present invention realizes the walking of the entire hoisting equipment on the bridge through the traveling wheel groups 900, and realizes the construction of hoisting and assembling the box girder of different segments of the bridge. The present invention unwinds one end of the first steel wire rope 403 through the winch-type pulling mechanism 400 and winds the other end of the first steel wire rope 403, so that the two wheel-group type transporting mechanisms 300 move synchronously along the length direction of the longitudinal guide rails 200. Furthermore, the box girder lifted by the hoisting mechanism 600 moves along the longitudinal guide rails 200, and the winch-type tensioning mechanism 500 is used to adjust the tension degree of the connection between the two wheel-group type transporting mechanisms 300, so that while the two move synchronously, it avoids the jerks during the movement, which may cause the box girder to shake and swing. Moreover, the present invention can adjust the distance between the two wheel-group type transporting mechanisms 300 through the winch-type tensioning mechanism 500, so as to realize the hoisting mechanism 600 hoisting box girders of different models and ensure the stability of the hoisted box girder. At the same time, the hoisting mechanism 600 hoists the box girder through the transmission of the two wheel-group type transporting mechanisms 300, making the hoisting of the box girder smoother and more stable. In summary, the present invention can effectively improve the stability of the box girder hoisting, ensure the accuracy of the alignment between the lower end of the box girder and the upper end of the pier, avoid the situation of shaking, swinging or tilting of the box girder during the hoisting process, and improve the construction efficiency.

[0020] As a preferred embodiment of the present invention, as Figure 1 , 3As shown in FIGS. 4, 11, and 12, the assembly rack 100 includes two longitudinal beams 101, which are arranged side by side along the transverse direction of the bridge. A plurality of first transverse beams are provided between the two longitudinal beams 101. These first transverse beams are spaced along the length direction of the longitudinal beams 101, and both ends of each first transverse beam are fixedly connected to the two longitudinal beams 101 respectively. Along the length direction of each longitudinal beam 101, a plurality of pairs of vertical rods 102 are connected at intervals. An assembly buckle seat 103 is fixed at the lower end of each pair of vertical rods 102, and the assembly buckle seat 103 is detachably connected to the corresponding longitudinal guide rail 200. In this embodiment, the two longitudinal guide rails 200 are connected by a plurality of second transverse beams 204. These second transverse beams 204 are spaced along the length direction of the longitudinal guide rails 200, and both ends of each second transverse beam 204 are connected and fixed to the two longitudinal guide rails 200 respectively.

[0021] As a preferred embodiment of the present invention, as Figure 3 、 6 、11 shown, the longitudinal guide rail 200 includes a guide rail body 201, which extends along the length direction of the bridge. Upper and lower guide rope grooves 202 and 203 are respectively formed at the upper and lower ends of the guide rail body 201. The upper guide rope groove 202 and the lower guide rope groove 203 respectively extend out of both ends of the guide rail body 201 along the length direction of the guide rail body 201. In this embodiment, a guide wheel 205 is installed at one end of the guide rail body 201 away from the winch pulling mechanism 400. One end of the first steel wire rope 403 exits from the winch pulling mechanism 400, and then extends from one end to the other end of the upper guide rope groove 202 along the guidance of the upper guide rope groove 202, and then enters the lower guide rope groove 203 through the guidance of the guide wheel 205, and then is connected to the corresponding wheel group type moving mechanism 300 along the guidance of the lower guide rope groove 203; the other end of the first steel wire rope 403 extends into the lower guide rope groove 203 along the extending direction of the lower guide rope groove 203 and is connected to another wheel group type moving mechanism 300. In this way, in this embodiment, due to the adoption of the upper guide rope groove 202 and the lower guide rope groove 203, most of the first steel wire rope 403 is in a hidden state, avoiding contact, rubbing, winding, etc. with other nearby components during the operation process, and preventing the influence on the pulling operation of the two wheel group type moving mechanisms 300. By controlling the operation of the winch pulling mechanism 400 in this embodiment, the release of one end of the first steel wire rope 403 and the winding of the other end of the first steel wire rope 403 are realized, so that the two wheel group type moving mechanisms 300 move synchronously along the guidance of the longitudinal guide rail 200.

[0022] As a preferred embodiment of the present invention, as Figures 7-9As shown, the wheel set type transportation mechanism 300 includes two first sliding seats 301. These two first sliding seats 301 are arranged side by side and are respectively slidably connected to the two longitudinal guide rails 200. In this embodiment, the number of the first steel wire ropes 403 is two. These two first steel wire ropes 403 are arranged side by side, and the same-side ends of the two first steel wire ropes 403 are respectively connected to the two first sliding seats 301. As Figures 1-3 shown, the winch type pulling mechanism 400 of this embodiment includes two pulling winch drums 401 arranged at intervals in the transverse direction of the bridge. The mutually approaching ends of these two pulling winch drums 401 are coaxially connected together. A transmission sprocket 402 is coaxially installed at one end of one of the pulling winch drums 401. The two first steel wire ropes 403 are respectively wound on the two pulling winch drums 401. By driving the transmission sprocket 402 to rotate, the two pulling winch drums 401 are synchronously rotated, so as to realize the synchronous winding and unwinding operation of the two first steel wire ropes 403. In this embodiment, two first assembly wheel seats 303 are arranged at the lower end of each first sliding seat 301. These two first assembly wheel seats 303 are arranged at intervals in the transverse direction of the bridge. Connecting wings 302 are respectively constructed on both sides of the first sliding seat 301. These two connecting wings 302 are respectively detachably connected to the two first assembly wheel seats 303. A plurality of first transmission wheels 304 are rotatably installed on each first assembly wheel seat 303. These first transmission wheels 304 are arranged at intervals along the length direction of the longitudinal guide rail 200.

[0023] As a preferred embodiment of the present invention, as Figure 3 , 6As shown in FIGS. 6 and 7, the hoisting mechanism 600 includes a first dual-axis motor 603 and two hoisting drums 601. Among them, the two hoisting drums 601 are arranged between the two wheel-group type transporting mechanisms 300, the first dual-axis motor 603 is arranged between the two hoisting drums 601, and the two output shafts of the first dual-axis motor 603 are coaxially connected to the two hoisting drums 601 respectively. In this embodiment, two second steel wires 602 are wound on each hoisting drum 601, and both ends of each second steel wire 602 pass through two first assembly wheel seats 303 on the same side of the two wheel-group type transporting mechanisms 300 respectively. The second steel wire 602 passes through each first transmission wheel 304 in a undulating form, and a hoisting hook 604 is connected to the end of the second steel wire 602. By controlling the operation of the first dual-axis motor 603 in this embodiment, the two hoisting drums 601 are driven to rotate synchronously, and the two ends of each second steel wire 602 are released or wound synchronously, so as to realize the hoisting operation of the box girder by the hoisting hook 604. Moreover, since the second steel wire 602 of this embodiment passes through each first transmission wheel 304 on the corresponding first assembly wheel seat 303 in a undulating form, the movement of the second steel wire 602 is made more stable, and a primary tensioning effect is exerted on the second steel wire 602, avoiding situations such as loosening and jitter of the second steel wire 602, and making the hoisting of the box girder more stable.

[0024] As a preferred embodiment of the present invention, as Figure 3 、 6As shown, the winch - type tensioning mechanism 500 includes a second double - shaft motor 502 and two tensioning winch drums 501. Among them, the two tensioning winch drums 501 are arranged between two wheel - group type transporting mechanisms 300, and the second double - shaft motor 502 is arranged between the two tensioning winch drums 501. The two output shafts of the second double - shaft motor 502 are respectively coaxially connected to the two tensioning winch drums 501. In this embodiment, a third steel wire rope 503 is wound on each tensioning winch drum 501, and the two ends of the third steel wire rope 503 are respectively connected to the mutually approaching ends of two first sliding seats 301 on the same side of the two wheel - group type transporting mechanisms 300. By controlling the operation of the second double - shaft motor 502 in this embodiment, it drives the two tensioning winch drums 501 to synchronously wind or unwind the two third steel wire ropes 503, so that the two wheel - group type transporting mechanisms 300 are tensioned; moreover, when the first steel wire rope 403 is slack or over - tensioned, the winch - type tensioning mechanism 500 can be controlled to act, and it dynamically compensates for the slack or over - tensioned first steel wire rope 403 through the third steel wire rope 503 to ensure the smooth operation of the two wheel - group type transporting mechanisms 300. In addition, in this embodiment, the distance between the two wheel - group type transporting mechanisms 300 can be adjusted. One end of the first steel wire rope 403 is disconnected from the corresponding wheel - group type transporting mechanism 300, the cylinder body of a longitudinal hydraulic cylinder is installed on this wheel - group type transporting mechanism 300, and then this end of the first steel wire rope 403 is connected to the cylinder rod of the longitudinal hydraulic cylinder. By controlling the operation of the winch - type tensioning mechanism 500 to wind or unwind the third steel wire rope 503, and at the same time controlling the longitudinal hydraulic cylinder to extend and retract, the adjustment of the distance between the two wheel - group type transporting mechanisms 300 is realized, and further the lifting span of the lifting mechanism 600 is adjusted to adapt to box girders of different models. In this embodiment, the tensioning winch drum 501 and the lifting winch drum 601 on the same side are respectively rotatably installed on the second sliding seat 1000, and the second sliding seat 1000 is slidably assembled on the corresponding longitudinal guide rail 200; moreover, the first double - shaft motor 603 and the second double - shaft motor 502 are respectively connected to the second sliding seat 1000 through an adapter plate.

[0025] As a preferred embodiment of the present invention, as Figure 7 、 8As shown, an adjustable anti-vibration mechanism 700 is installed on each first sliding seat 301. The end of the second steel wire rope 602 passes through the adjustable anti-vibration mechanism 700 and extends downward. The adjustable anti-vibration mechanism 700 of this embodiment includes a connecting rod 701, an adjusting arm 702, an assembly seat 703, a guiding seat 705 and an adjusting oil cylinder 704. Among them, the upper end of the connecting rod 701 is fixedly connected to the lower end of the first sliding seat 301. One end of the adjusting arm 702 is hinged to the lower end of the connecting rod 701. The end of the adjusting arm 702 away from the connecting rod 701 is hinged to the assembly seat 703. The guiding seat 705 is detachably connected to the assembly seat 703. Two rotating rod groups are arranged side by side on the guiding seat 705 along the length direction of the bridge. Each rotating rod group includes a plurality of rotating rods 706 arranged at intervals in the vertical direction. The two ends of the adjusting oil cylinder 704 are respectively hinged to the first sliding seat 301 and the adjusting arm 702. The second steel wire rope 602 of this embodiment passes through the adjustable anti-vibration mechanism 700 in two ways; the first is, as Figure 9 shown, the second steel wire rope 602 passes through the gap between the two rotating rod groups, so that the vertical part of the second steel wire rope 602 is restricted and the situation of swinging is avoided. The second is, as Figure 10 shown, the second steel wire rope 602 passes through one of the rotating rod groups and sequentially passes through each rotating rod 706 of the rotating rod group in a undulating form. In this way, the rotating rod group plays a role of secondary tensioning on the second steel wire rope 602, that is, tensioning the vertical part of the second steel wire rope 602, avoiding the situations of loosening and jitter of the vertical part of the second steel wire rope 602. Cooperating with the above-mentioned primary tensioning, the lifting of the box girder is made more stable. In this embodiment, the action of the adjusting oil cylinder 704 can be controlled to drive the guiding seat 705 to adjust its vertical position and horizontal position through the adjusting arm 702, so that the second steel wire rope 602 extends downward in a slightly inclined state. Compared with the second steel wire rope 602 in the vertical state, the inclined second steel wire rope 602 has an excellent inhibitory effect on the swinging and jitter of the box girder; moreover, the position of the second steel wire rope 602 can be adjusted to facilitate its hanging on the lifting points of box girders of different models.

[0026] As a preferred embodiment of the present invention, as Figures 3-5As shown, a guiding mechanism 800 is installed at one end of each longitudinal guide rail 200 close to the winch pulling mechanism 400. The guiding mechanism 800 includes a connecting seat 803 and two second assembly wheel seats 801. Among them, the connecting seat 803 is constructed at the end of the longitudinal guide rail 200. Two first guide wheel groups are installed on the connecting seat 803 at intervals in the vertical direction. Each first guide wheel group includes a plurality of first guide wheels 804. These first guide wheels 804 are arranged at intervals along the length direction of the longitudinal guide rail 200, and each first guide wheel 804 is rotatably connected to the connecting seat 803. The two second assembly wheel seats 801 described in this embodiment are respectively detachably connected to the upper and lower ends of the connecting seat 803. A second guide wheel group is installed on each second assembly wheel seat 801. The second guide wheel group includes a plurality of second guide wheels 802. These second guide wheels 802 are arranged at intervals along the length direction of the longitudinal guide rail 200, and each second guide wheel 802 is rotatably connected to the second assembly wheel seat 801. Both ends of the first steel wire rope 403 extend out by pulling the winch drum 401 respectively, and each end of the first steel wire rope 403 passes through the gap between the corresponding first guide wheel group and the second guide wheel group, that is, the guiding mechanism 800 is used for guiding the first steel wire rope 403, so that both ends of the first steel wire rope 403 smoothly and smoothly extend into the upper wire guiding groove 202 and the lower wire guiding groove 203.

[0027] As a preferred embodiment of the present invention, as Figure 1 , 11As shown in Fig. 12, the traveling wheel set 900 includes a traveling wheel seat 903. At the corresponding vertical rod 102, two half buckle seats 901 are provided. At the ends of the two half buckle seats 901 close to each other, two vertical buckle grooves 902 are respectively formed. When the two half buckle seats 901 are detachably connected together, the corresponding vertical buckle grooves 902 of the two half buckle seats 901 are fastened and buckled on the corresponding vertical rod 102. The traveling wheel seat 903 of this embodiment is detachably connected to one of the half buckle seats 901. Along the length direction of the bridge, a plurality of traveling wheels 904 are rotatably connected to the traveling wheel seat 903 at intervals. The traveling wheel set 900 of this embodiment can be equipped with a braking system, and its structure is the same as that of the existing equipment for lifting box girders. Generally, brake pads or brake discs are used. The brake pads or brake discs are installed on each traveling wheel 904. When the entire hoisting device moves to a predetermined position, each brake pad or brake disc is manipulated to lock each traveling wheel 904 to avoid the situation that the entire hoisting device displaces during the lifting and assembly construction of the box girder. A driven sprocket is installed on the axle of the traveling wheel 904 at the end. A power motor is installed on the traveling wheel seat 903. A driving sprocket is assembled on the output shaft of the power motor. The driving sprocket is connected to the driven sprocket through a transmission chain. When the braking system releases the braking of the traveling wheel 904, the power motor is controlled to act, so that the traveling wheel set 900 moves on the bridge through the transmission of the sprockets, achieving the purpose of transferring from one construction section to another construction section.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A hoisting device for box girders in bridge construction, characterized in that: It includes two longitudinal guide rails installed side by side along the transverse direction of the bridge at the lower end of the assembly frame. Two wheel group type transportation mechanisms are installed at intervals along the length direction between the two longitudinal guide rails. A winch type tensioning mechanism is connected between the two wheel group type transportation mechanisms. A winch type pulling mechanism installed at one end of the assembly frame winds a first steel wire rope. Two ends of the first steel wire rope are respectively connected to the two ends of the two wheel group type transportation mechanisms that are far away from each other. A lifting mechanism is in transmission connection with the two wheel group type transportation mechanisms. Traveling wheel groups are respectively installed on both sides at both ends of the assembly frame.

2. The hoisting equipment for box girders in bridge construction according to claim 1, wherein: The assembly frame includes two longitudinal beams arranged side by side along the transverse direction of the bridge. The two longitudinal beams are connected by multiple first transverse beams, and these first transverse beams are arranged at intervals along the length direction of the longitudinal beams. Multiple pairs of vertical rods are connected at intervals along the length direction on each longitudinal beam. Assembly buckle seats are fixed at the lower ends of each pair of vertical rods. The assembly buckle seats are detachably connected to the corresponding longitudinal guide rails. The two longitudinal guide rails are connected by multiple second transverse beams, and these second transverse beams are arranged at intervals along the length direction of the longitudinal guide rails.

3. The hoisting device for box girders in bridge construction according to claim 1, wherein: The longitudinal guide rail includes a guide rail body with an upper wire guide groove and a lower wire guide groove respectively constructed at the upper and lower ends. The upper wire guide groove and the lower wire guide groove respectively extend out of both ends of the guide rail body along the length direction of the guide rail body. A guide wheel is installed at one end of the guide rail body away from the winch type pulling mechanism. One end of the first steel wire rope enters the lower wire guide groove through the upper wire guide groove via the guide wheel, and is connected to the corresponding wheel group type transportation mechanism. The other end of the first steel wire rope is connected to the other wheel group type transportation mechanism through the lower wire guide groove.

4. The hoisting device for box girders in bridge construction according to claim 1, characterized in that: The wheel group type transportation mechanism includes two first sliding seats arranged side by side and respectively slidably connected to the two longitudinal guide rails. The number of the first steel wire ropes is two. These two first steel wire ropes are arranged side by side, and the same side ends of the two first steel wire ropes are respectively connected to the two first sliding seats.

5. The hoisting device for box girders in bridge construction according to claim 4, characterized in that: Two first assembly wheel seats are installed at intervals along the transverse direction of the bridge at the lower end of each first sliding seat. Multiple first driving wheels are rotatably installed at intervals along the length direction of the longitudinal guide rail on each first assembly wheel seat.

6. The hoisting device for box girders in bridge construction according to claim 5, characterized in that: The lifting mechanism includes two lifting winch drums arranged between the two wheel group type transportation mechanisms. A first double-shaft motor is arranged between the two lifting winch drums. Two output shafts of the first double-shaft motor are respectively coaxially connected to the two lifting winch drums. Two second steel wire ropes are wound on each lifting winch drum. Two ends of each second steel wire rope respectively pass through two first assembly wheel seats on the same side of the two wheel group type transportation mechanisms. The second steel wire rope passes through each first driving wheel in a undulating form, and a lifting hook is connected to the end of the second steel wire rope.

7. The hoisting device for box girders in bridge construction according to claim 4, characterized in that: The winch type tensioning mechanism includes two tensioning winch drums arranged between the two wheel group type transportation mechanisms. A second double-shaft motor is arranged between the two tensioning winch drums. Two output shafts of the second double-shaft motor are respectively coaxially connected to the two tensioning winch drums. A third steel wire rope is wound on each tensioning winch drum. Two ends of the third steel wire rope are respectively connected to the approaching ends of the two first sliding seats on the same side of the two wheel group type transportation mechanisms.

8. The hoisting device for box girders in bridge construction according to claim 4, characterized in that: An adjustable anti-vibration mechanism is installed on each of the first sliding seats, and the end of the second steel wire rope passes through the adjustable anti-vibration mechanism and extends downward.

9. The hoisting device for box girders in bridge construction according to claim 8, characterized in that: The adjustable anti-vibration mechanism includes a connecting rod with one end connected to the first sliding seat. An adjusting arm is hinged to the other end of the connecting rod. A mounting seat is hinged to the end of the adjusting arm away from the connecting rod. A guiding seat is connected to the mounting seat. Two rotating rod groups are arranged side by side along the length direction of the bridge on the guiding seat. Each rotating rod group includes a plurality of rotating rods arranged at intervals in the vertical direction. The two ends of the adjusting oil cylinder are respectively hinged to the first sliding seat and the adjusting arm. The second steel wire rope passes through the gap between the two rotating rod groups, or the second steel wire rope passes through each rotating rod in a fluctuating form through one of the rotating rod groups.

10. The hoisting device for box girders in bridge construction according to claim 1, characterized in that: A guiding mechanism is installed at one end of each longitudinal guide rail close to the winch pulling mechanism. The guiding mechanism includes a connecting seat constructed at the end of the longitudinal guide rail. Two first guide wheel groups are installed at intervals in the vertical direction on the connecting seat. Each first guide wheel group includes a plurality of first guide wheels rotatably arranged at intervals along the length direction of the longitudinal guide rail. Second mounting wheel seats are detachably connected to the upper and lower ends of the connecting seat respectively. A second guide wheel group is installed on the second mounting wheel seat. The second guide wheel group includes a plurality of second guide wheels rotatably arranged at intervals along the length direction of the longitudinal guide rail. Each end of the first steel wire rope passes through the gap between the corresponding first guide wheel group and the second guide wheel group.

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