Aerial work platform at cantilevered arm of long-span viaduct and operation method

Abstract

The application discloses a large-span high-level operation platform at a cantilevered arm of a high bridge and an operation method, two parallel I-shaped steel guide rails are arranged on the bridge, a walking mechanism between the two I-shaped steel guide rails walks along the length direction of the bridge, when a cover beam block is encountered in the walking process, a driving device drives a suspended construction platform to go up and move outward through a transmission mechanism, specifically, a connecting steel plate is in a vertical state when a connecting shaft one of the connecting steel plate is located at the leftmost side of a guide groove two and a connecting shaft two is located at the top side of a guide groove one, and an output end of the driving device is not stressed; when the connecting shaft one moves from the leftmost side to the rightmost side of the guide groove two and the connecting shaft two moves from the top side to the bottom side of the guide groove one, the connecting steel plate is in an outward rotation and upward state, a counterweight block and the overall center of gravity of the suspended construction platform move rightward, and a motor winch is automatically tightened to keep the traction rope in a tension state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge side construction platforms, in particular to a high-altitude working platform for large-span elevated bridge cantilevered arms and an operation method. BACKGROUND

[0002] Common bridge cantilevered arm construction contents include concrete bridge outer facade decoration, longitudinal drainage pipe installation, steel box beam cantilevered arm welding, detection, paint spraying, etc. At present, the commonly used method is to use a crane or to build a jump board for construction, and the operating personnel directly perform construction on the working platform provided by the above-mentioned machinery. However, large mechanical equipment is expensive, and the construction quality is not easy to guarantee due to the swinging of the basket during construction. The maneuverability is poor, and the crane needs to be moved back and forth when welding, bolt fastening, weld repair, paint repair, and installing drainage pipes. In addition, block-shaped walls are set on both sides of the bridge deck to prevent beam falling (generally connected to the bent cap). For places where earthquakes are more serious, blocks are set between each beam to stop the beam from moving horizontally. However, the blocks will cause the construction to be unable to be continuous, resulting in great construction difficulty, and the existing bridge cantilevered arm suspension platform cannot adapt to this working condition. SUMMARY

[0003] The technical problem to be solved by the present application is that the existing bridge cantilevered arm working platform has high construction cost and does not have the function of continuous construction with the bent cap block.

[0004] In order to solve the above technical problems, the inventors have summarized and obtained the technical scheme of the present application through practice. The present application adopts the following technical scheme:

[0005] A high-altitude working platform for large-span elevated bridge cantilevered arms, comprising an I-steel guide rail and a body steel structure, the I-steel guide rail being fixedly installed on the upper surface of the bridge along the length direction of the bridge, the body steel structure being provided with a walking mechanism for freely walking along the length direction of the elevated bridge, and a suspension construction platform being installed below the side of the body steel structure away from the I-steel guide rail;

[0006] The guide frame is provided with two guide frames, the two guide frames being respectively installed on the two sides of the body steel structure, a driving device being installed between the two guide frames, and the driving device being used to drive the suspension construction platform to rotate outwardly and cross the obstacles through a transmission mechanism;

[0007] The transmission mechanism comprises a guide structure provided on the opposite side of the guide frame, a connecting steel plate being movably installed in the guide structure, a hinge seat for connecting with the suspension construction platform and a limiting plate for limiting the maximum angle of the suspension construction platform rotating outwardly relative to the connecting steel plate being provided on the connecting steel plate;

[0008] The output end of the driving device is connected with a transmission rod through a hinge shaft, and one end of the transmission rod is connected to the back side of the body of the connecting steel plate through a hinge shaft;

[0009] The body steel structure and the guide frame are both provided with a wheel assembly, a traction rope is wound around the wheel assembly, the other end of the body steel structure is provided with an electric winding drum, the electric winding drum is used for tightening the traction rope, one end of the traction rope is connected to the side of the suspended construction platform far away from the guide frame, and the other end is connected to the electric winding drum;

[0010] When the connecting steel plate is in a vertical state and the suspended construction platform is in a horizontal state through the action of the electric winding drum and the traction rope, the direction of the force borne by the output end of the driving device is an axial direction.

[0011] Preferably, the connecting steel plate is provided with a connecting shaft one and a guide groove one, the guide frame is provided with a connecting shaft two and a guide groove two, the guide groove one is used for the movement of the connecting shaft two along the length direction of the connecting steel plate, and the guide groove two is used for the connecting shaft one to gradually approach the bridge when the suspended construction platform rotates outward and gradually move away from the side of the bridge when the suspended construction platform rotates inward;

[0012] The top of the connecting shaft one is hingedly connected with a connecting rod, and the free end of the connecting rod is used for mounting a counterweight that slides left and right relative to the body steel structure;

[0013] When the connecting shaft one is at the leftmost side of the guide groove two and the connecting shaft two is at the topmost part of the guide groove one, the suspended construction platform is in a vertical state, and at this time, the direction of the force borne by the output end of the driving device is an axial direction.

[0014] Preferably, when the suspended construction platform moves outward, the connecting shaft one is located at the rightmost side of the guide groove two, the connecting shaft two is located at the bottommost part of the guide groove one, and the center of gravity of the counterweight and the suspended construction platform moves rightward as a whole.

[0015] Preferably, the side of the suspended construction platform far away from the guide frame is provided with an elastic contact structure.

[0016] Preferably, the elastic contact structure comprises a fixed cylinder mounted on the side of the suspended construction platform away from the connecting steel plate, a piston rod and a spring used for flexibly mounting the piston rod are mounted in the fixed cylinder, one end of the piston rod is exposed outside the fixed cylinder and is used for being press-connected to the side of the bridge.

[0017] Preferably, the I-shaped steel guide rails are arranged in two groups, a sliding frame is arranged between the two groups of I-shaped steel guide rails, the sliding frame comprises two symmetrically distributed sliding plates and a support structure used for limiting the two sliding plates to be respectively located in the web regions of the corresponding I-shaped steel guide rails, the sliding plates are in a C-shaped structure as a whole, guide wheels are mounted on the top, the bottom and the side of the sliding plates, and the support structure is connected to the bottom of the body steel structure.

[0018] Preferably, the walking mechanism comprises a hydraulic cylinder, the piston rod end of the hydraulic cylinder is movably mounted with a crank handle, the crank handle is rotatably mounted on the bottom of the body steel structure, the top of one set of I-beam guide rails is bolted with two symmetrically arranged ratchet strip plates, a gap is reserved between the two ratchet strip plates, a guide wheel is mounted in the gap, the guide wheel is mounted on the crank handle, and a pin shaft is mounted on both sides of the crank handle, a rotating rod is mounted on the pin shaft, a limiting shaft is mounted on the free end of the rotating rod, and the limiting shaft is used for acting on the tooth groove of the ratchet strip plate, and the two rotating rods are connected with elastic members on the side close to the free end.

[0019] Preferably, a sliding sleeve is mounted on the piston end of the hydraulic cylinder through a rotating shaft, the sliding sleeve is sleeved on the outside of the crank handle, and a limiting head is arranged at the end of the crank handle to limit the maximum value of the outward movement of the sliding sleeve relative to the crank handle.

[0020] Preferably, vertical guide grooves are arranged on opposite sides of the two guide frames, a connecting plate is mounted in the vertical guide groove, the connecting plate and the output end of the driving device are fixedly connected with the hinged seat of the transmission rod, so as to ensure the stable vertical work of the output end of the driving device.

[0021] An operating method of a high-altitude working platform at a cantilevered arm of a large-span viaduct, comprising the following steps:

[0022] Step one: I-beam guide rail installation

[0023] Two parallel I-beam guide rail installation lines are popped out on the surface of the bridge through lofting, embedded foundation bolts are installed in the I-beam guide rail installation lines, the I-beam guide rails are installed along the length direction of the bridge through the foundation bolts, two symmetric ratchet strip plates are bolted on the top of one of the I-beam guide rails, and a suitable gap is reserved between the two ratchet strip plates;

[0024] Step two: body steel structure and suspension construction platform assembly

[0025] The guide frames are fixed on the ground through bolts or welding, the driving device is installed on the body steel structure, the output end of the driving device is connected with the connecting steel plates in the two guide frames through the transmission rods, connecting shaft one is located in guide groove two, and connecting shaft two is located in guide groove one;

[0026] The suspension construction platform is connected with the connecting steel plates through the hinged seat on the ground, the wheel assemblies are installed on the guide frames and the body steel structure, the electric winch is fixed on the end of the body steel structure away from the guide frames, the free end of the traction rope wound on the electric winch is connected with the suspension construction platform through the wheel assemblies on the side away from the guide frames, and the traction rope is tightened through the electric winch, so as to obtain the assembly;

[0027] Step three: walking mechanism installation

[0028] Two carriages are respectively installed in the web area of corresponding I-shaped guide rails through support structures between two parallel I-shaped guide rails;

[0029] Step four: hoisting the assembly

[0030] The assembly is hoisted horizontally on the bridge outer side by the hoisting vehicle, and the support structure and the body steel structure are connected and fixed by bolts;

[0031] Step five: crossing the bent cap block obstacle

[0032] The output end of the driving device drives the transmission rod to rotate outward, so that the suspended construction platform moves outward, when the connecting shaft one is located at the rightmost side of the guide groove two and the connecting shaft two is located at the bottom of the guide groove one, the center of gravity of the counterweight and the suspended construction platform moves rightward as a whole;

[0033] Meanwhile, the electric winch is automatically tensioned during the upward and outward movement of the suspended construction platform;

[0034] The swing lever is swung by the hydraulic rod piston rod in the walking mechanism, and the two rotating rods on the swing lever are alternately and correspondingly matched with the tooth grooves on the ratchet bar plate through the limiting shaft, so that the suspended construction platform walks through the bent cap block along the length direction of the I-shaped steel guide rail;

[0035] After passing through the bent cap block, the output end of the driving device is lowered to drive the suspended construction platform to be horizontal again through the transmission rod, when the connecting shaft one is located at the leftmost side of the guide groove two and the connecting shaft two is located at the top of the guide groove one, the center of gravity of the counterweight and the suspended construction platform is reset as a whole, at this time, the connecting steel plate is vertical downward, and the electric winch is automatically released to the traction rope, so that the traction rope is always in a tensioned state, and the stress of the connecting shaft one and the connecting shaft two is released;

[0036] Finally, the whole suspended construction platform is continuously constructed along the side of the bridge between the two bent cap blocks through the walking mechanism.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] The application sets two parallel I-beam guide rails on the bridge, and the walking mechanism between the two I-beam guide rails walks along the length direction of the bridge. When encountering the bent block, the driving device drives the suspension construction platform to move upwards and outward through the transmission mechanism. Specifically, when the connecting shaft one of the connecting plate is located at the leftmost side of the guide groove two and the connecting shaft two is located at the top side of the guide groove one, the connecting plate is in a vertical state, and the output end of the driving device is not stressed. When the connecting shaft one moves from the leftmost side to the rightmost side of the guide groove two and the connecting shaft two moves from the top side to the bottom side of the guide groove one, the connecting plate rotates outward and moves upwards, the overall center of gravity of the counterweight block and the suspension construction platform moves to the right, and the traction rope is automatically tightened by cooperating with the electric winch to keep the traction rope in a tension state. The scheme only needs to use the lifting equipment twice, once for installation and once for disassembly. The operation is simple, safe and practical. The counterweight block is composed of counterweight assemblies with different weights, so that the allowable construction load of the operation platform can be adjusted. During the whole operation process, overturning is prevented, and when personnel or materials need to be added according to the construction requirement, the counterweight can be appropriately increased, which is safe and efficient.

[0039] In the application, a novel walking mechanism is adopted, and the two carriages are limited to the web of the corresponding I-beam guide rail through the support structure, the lateral overturning of the whole walking mechanism is prevented and limited, the reciprocating frequent movement of the extension and retraction of the piston rod of the hydraulic cylinder is used to drive the rocker handle to reciprocate, when the rocker handle moves forward, the rocker handle moves along the gap under the action of the guide wheel, and the specific process of the rocker handle in the reciprocating movement is as follows: when the left side of the rocker handle moves forward, the limiting shaft on the right side of the rocker handle is limited in the corresponding tooth groove, at this time, the left side moves forward first to stretch the elastic element so that the limiting shaft on the left side is first separated from the corresponding tooth groove and moves to the corresponding tooth groove; when the left side of the rocker handle moves backward, the limiting shaft on the left side of the rocker handle is limited in the corresponding tooth groove, at this time, the right side moves forward first to stretch the elastic element so that the limiting shaft on the right side is first separated from the corresponding tooth groove and moves to the corresponding tooth groove, and the walking of the whole device is completed through the reciprocating movement. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the application;

[0041] Figure 2 It is a schematic diagram of the specific structure between the two guide frames of the application;

[0042] Figure 3 It is a schematic diagram of the walking mechanism between the two I-beam guide rails of the application;

[0043] Figure 4 It is a connection relationship diagram of the rocker handle and the ratchet rack plate of the application;

[0044] Figure 5This is a diagram showing the connection relationship between the crank handle and the ratchet plate of the present invention.

[0045] Figure 6 This is a schematic diagram of the specific structure of the elastic contact structure of the present invention.

[0046] In the diagram: 10. I-beam guide rail; 11. Slide carriage; 12. Slide plate; 13. Support structure; 14. Guide wheel; 15. Hydraulic cylinder; 151. Sliding sleeve; 152. Limiting head; 16. Handle; 17. Ratchet plate; 18. Rotating rod; 19. Limiting shaft; 110. Elastic element; 20. Main steel structure; 21. Traction rope; 22. Wheel assembly; 23. Electric drum; 30. Suspended construction platform; 31. Elastic contact structure; 311. Fixed cylinder; 312. Spring; 313. Piston rod; 40. Drive device; 50. Guide frame; 52. Connecting steel plate; 521. Limiting plate; 522. Guide groove two; 523. Connecting shaft two; 524. Connecting shaft one; 525. Connecting rod; 526. Counterweight; 527. Guide groove one; 53. Transmission rod; 54. Connecting plate; 55. Vertical guide groove. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Example 1, such as Figures 1 to 3 As shown, an aerial work platform for the cantilever arm of a long-span viaduct includes an I-beam guide rail 10 and a main steel structure 20. The I-beam guide rail 10 is fixedly installed on the upper surface of the bridge along the length of the bridge. The main steel structure 20 is equipped with a walking mechanism for free movement along the length of the viaduct. A suspended construction platform 30 is installed below the side of the main steel structure 20 away from the I-beam guide rail 10.

[0050] There are two guide frames 50, which are respectively installed on both sides of the main steel structure 20. A drive device 40 is installed between the two guide frames 50. The drive device 40 is used to drive the suspended construction platform 30 to rotate outward to cross the obstacle via a transmission mechanism.

[0051] Two guide frames 50 are provided with vertical guide grooves 55 on opposite sides, and connecting plates 54 are installed in the vertical guide grooves 55, and the connecting plates 54 are connected and fixed with the hinged seats of the output end of the driving device 40 and the transmission rod 53, so as to ensure the stable vertical operation of the output end of the driving device 40.

[0052] The transmission mechanism comprises guide structures 51 provided on opposite sides of the guide frames 50, and connecting steel plates 52 are movably installed in the guide structures 51, and the connecting steel plates 52 are provided with hinged seats for connecting with the suspended construction platform 30 and limiting plates 521 for limiting the maximum angle of the outer rotation of the suspended construction platform 30 relative to the connecting steel plates 52;

[0053] The output end of the driving device 40 is connected with the transmission rod 53 through a hinged shaft, and one end of the transmission rod 53 is connected to the back side of the body of the connecting steel plate 52 through a hinged shaft;

[0054] The body steel structure 20 and the guide frame 50 are both provided with wheel assemblies 22, and the traction ropes 21 are wound around the wheel assemblies 22, and the other end of the body steel structure 20 is provided with an electric winch 23, and the electric winch 23 is used for tightening the traction ropes 21, and one end of the traction ropes 21 is connected to the side of the suspended construction platform 30 away from the guide frame 50, and the other end is connected with the electric winch 23;

[0055] When the connecting steel plate 52 is in a vertical state, and the suspended construction platform 30 is in a horizontal state under the action of the electric winch 23 and the traction ropes 21, the direction of the force acting on the output end of the driving device 40 is the axial direction.

[0056] The connecting steel plate 52 is provided with a connecting shaft one 524 and a guide groove one 527, and the guide frame 50 is provided with a connecting shaft two 523 and a guide groove two 522, the guide groove one 527 is used for the movement of the connecting shaft two 523 along the length direction of the connecting steel plate 52, and the guide groove two 522 is used for the connecting shaft one 524 to gradually approach the bridge when the suspended construction platform 30 is rotated outward, and to gradually move away from the side of the bridge when the suspended construction platform 30 is rotated inward;

[0057] The top of the connecting shaft one 524 is hinged with a connecting rod 525, and the free end of the connecting rod 525 is used for installing a counterweight 526 which can slide left and right relative to the body steel structure 20; wherein the counterweight 526 can be additionally provided with a plug pin for plugging and fixing the counterweight 526 and the body steel structure 20, so as to prevent the suspended construction platform 30 from moving during construction.

[0058] When the connecting shaft one 524 is at the leftmost side of the guide groove two 522 and the connecting shaft two 523 is at the topmost part of the guide groove one 527, the suspended construction platform 30 is in a vertical state, and at this time, the direction of the force acting on the output end of the driving device 40 is the axial direction.

[0059] When the suspended construction platform 30 moves outward, and the connecting shaft 524 is located at the rightmost side of the guide groove 522 and the connecting shaft 523 is located at the bottom of the guide groove 527, the center of gravity of the counterweight 526 and the suspended construction platform 30 shifts to the right as a whole.

[0060] Driven by the drive device 40 (hydraulic cylinder or electric push rod), the connecting plate 54 moves upward along the vertical guide groove 55 via the transmission rod 53. The connecting shaft 1 524 moves from the leftmost side to the rightmost side of the guide groove 2 522, and the connecting shaft 2 523 moves from the topmost side to the bottommost side of the guide groove 1 527. The bottom of the connecting steel plate 52 rotates outward and moves upward. The suspended construction platform 30 moves upward and outward. The connecting steel plate 52 drives the connecting rod 525 to move the counterweight to the right, causing the center of gravity of the counterweight 526 and the suspended construction platform 30 to shift to the right, ensuring structural stability and reliability when passing through the cover beam block obstacle. After passing the obstacle, the drive device 40 rotates the bottom of the connecting steel plate 52 inward and moves it downward via the transmission rod 53. The connecting shaft 1 524 moves from the rightmost to the leftmost side, and the connecting shaft 2 523 moves from the bottommost to the topmost side. When the connecting shaft 1 524 is at the leftmost side, the connecting shaft 2 523 is at the topmost side, and the connecting steel plate 520 is in a vertical state at this time. When the connecting steel plate 52 rotates outward or inward, it needs to be coordinated with the electric drum 23 via the traction rope 21 and the limiting plate 521 to make the suspended construction platform 30 horizontal. At this time, the direction of the force on the output end of the drive device 40 is in the axial direction.

[0061] The following improvements are made based on the above embodiments, such as... Figures 1 to 5 As shown, two sets of I-beam guide rails 10 are arranged side by side, and a slide frame 11 is slidably arranged between the two sets of I-beam guide rails 10. The slide frame 11 includes two symmetrically distributed slide plates 12 and a support structure 13 for limiting the two slide plates 12 to be located in the corresponding web area of ​​the I-beam guide rail 10. The slide plates 12 are C-shaped in general. Guide wheels 14 are installed on the top, bottom and sides of the slide plates 12. The support structure 13 is connected to the bottom of the main steel structure 20. The traveling mechanism includes a hydraulic cylinder 15. A rocker arm 16 is movably installed at the end of the piston rod 313 of the hydraulic cylinder 15. The rocker arm 16 is rotatably installed on the main steel structure 20. At the bottom of the 0 and at the end of the main steel structure 20 away from the guide frame 50, two symmetrically arranged ratchet plates 17 are bolted to the top of a set of I-beam guide rails 10. A gap is reserved between the two ratchet plates 17, and a guide wheel 14 is installed in the gap. The guide wheel 14 is installed on the crank handle 16, and a pin is installed on the crank handle 16 on both sides of the guide wheel 14. A rotating rod 18 is installed on the pin, and a limit shaft 19 is installed on the free end of the rotating rod 18. The limit shaft 19 is used to act in the tooth groove of the ratchet plate 17. An elastic element 110 is connected to the side of the two rotating rods 18 near the free end.

[0062] The piston rod 313 of the hydraulic cylinder 15 is provided with a sliding sleeve 151 through a rotating shaft, the sliding sleeve 151 is sleeved outside the handle 16, and the end of the handle 16 is provided with a limiting head 152 for limiting the maximum value of the outward movement of the sliding sleeve 151 relative to the handle 16.

[0063] Specifically, the support structure 13 can limit the two sliding frames 11 to the web of the corresponding I-beam guide rail 10, and the entire walking mechanism is laterally prevented from overturning. Through the reciprocating motion of the extension and retraction of the piston rod of the hydraulic cylinder 15, the handle 16 is driven to reciprocate through the sliding sleeve 151. When the handle 16 moves forward, the handle 16 moves along the gap (two ratchet plates 17) under the action of the guide wheel 14. During the reciprocating motion of the handle 16, specifically, when the left side of the handle 16 moves forward, the limiting shaft 19 on the right side of the handle 16 will be limited in the corresponding tooth groove, at this time, the left side will first stretch the elastic member 110 (spring) to make the limiting shaft 19 on the left side first disengage from the corresponding tooth groove and move forward to the corresponding tooth groove (when the elastic member 110 is elastically reset). When the left side of the handle 16 moves backward, the limiting shaft 19 on the left side of the handle 16 will be limited in the corresponding tooth groove, at this time, the right side will first stretch the elastic member 110 to make the limiting shaft 19 on the right side first disengage from the corresponding tooth groove and move forward to the corresponding tooth groove, and the automatic walking of the entire device is completed through the reciprocating motion.

[0064] Based on the above embodiment, the following improvements are made, as shown in Figure 1 and Figure 6 The elastic contact structure 31 is installed on the side of the suspended construction platform 30 away from the guide frame 50, the elastic contact structure 31 includes a fixed cylinder 311 installed on the side of the suspended construction platform 30 opposite to the connecting steel plate 52, a piston rod 313 (the end is provided with a roller which contacts the side of the beam) and a spring 312 for flexibly installing the piston rod 313 are installed in the fixed cylinder 311, and one end of the piston rod 313 is exposed outside the fixed cylinder 311 and is used for pressing on the side of the bridge. The elastic contact structure 31 on the side of the suspended construction platform 30 can ensure the lateral flexibility of the structure, improve the stability and reliability of the structure.

[0065] An operation method of a large-span overhead bridge cantilever high-altitude working platform, the steps are as follows:

[0066] Step one: I-beam guide rail 10 installation

[0067] Two parallel I-beam guide rails 10 are installed on the bridge surface through lofting, embedded foundation bolts are installed in the I-beam guide rail 10 installation line, the I-beam guide rail 10 is installed along the length direction of the bridge through the foundation bolts, two symmetrical ratchet plates 17 are installed on the top of one of the I-beam guide rails 10 through bolts, and a suitable gap is reserved between the two ratchet plates 17;

[0068] Step two: Assemble the body steel structure 20 and the suspended construction platform 30

[0069] Fix the guide frame 50 on the ground by bolts or welding, install the driving device 40 on the body steel structure 20, connect the output end of the driving device 40 and the connecting steel plate 52 in the two guide frames 50 through the transmission rod 53, the connecting shaft one 524 is in the guide slot two 522 and the connecting shaft two 523 is in the guide slot one 527;

[0070] Connect the suspended construction platform 30 and the connecting steel plate 52 on the ground through the hinged seat, install the wheel assembly 22 on the guide frame 50 and the body steel structure 20, fix the electric winch 23 on the end of the body steel structure 20 away from the guide frame 50, connect the free end of the traction rope 21 wound on the electric winch 23 to the side of the suspended construction platform 30 away from the guide frame 50 through the wheel assembly 22, and tighten the traction rope 21 through the electric winch 23 to get the assembly;

[0071] Step three: Install the walking mechanism

[0072] Install the two carriages 11 in the web area of the corresponding I-shaped guide rail through the support structure 13 between the two parallel I-shaped guide rails;

[0073] Step four: Hoist the assembly

[0074] Hoist the assembly horizontally on the outside of the bridge through the hoisting crane, and connect and fix the support structure 13 and the body steel structure 20 through bolts;

[0075] Step five: Cross the cover beam block obstacle

[0076] The output end of the driving device 40 drives the transmission rod 53 to rotate outward, which causes the suspended construction platform 30 to move outward, and when the connecting shaft one 524 is at the rightmost side of the guide slot two 522 and the connecting shaft two 523 is at the bottom of the guide slot one 527, the center of gravity of the suspended construction platform 30 and the counterweight 526 move to the right as a whole;

[0077] At the same time, the electric winch 23 will automatically tension the traction rope 21 during the upward and outward movement of the suspended construction platform 30;

[0078] The swing lever 16 is swung by the hydraulic rod piston rod 313 in the walking mechanism, and the two rotating rods 18 on the swing lever 16 are alternately and correspondingly matched with the tooth grooves on the ratchet toothed plate 17 through the limiting shaft 19, so as to complete the walking along the length direction of the I-shaped steel guide rail 10 through the cover beam block;

[0079] After the blocking of the bent cap blocks, the output end of the driving device 40 is lowered through the transmission rod 53 to drive the suspended construction platform 30 to be re-horizoned, when the connecting shaft one 524 is located at the leftmost side of the guide groove two 522 and the connecting shaft two 523 is located at the top of the guide groove one 527, the gravity center of the counterweight block 526 and the suspended construction platform 30 is reset as a whole, at this time, the connecting steel plate 52 is vertically downward, at the same time, the electric winch 23 will automatically release the traction rope 21 to keep the traction rope 21 in a tensioned state, and release the stress of the connecting shaft one 524 and the connecting shaft two 523;

[0080] Finally, the whole suspended construction platform 30 is driven by the walking mechanism to continuously construct along the bridge side between the two bent cap blocks.

[0081] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. The substitution can be the substitution of part of the structure, device, method step, or the complete technical scheme. According to the technical scheme of the present application and the inventive concept, equivalent substitution or change should be covered in the protection scope of the present application.

Claims

1. A high aerial work platform at a cantilevered arm of a long-span viaduct, characterized in that, The utility model provides a kind of high bridge construction platform, including I-beam guide rail (10) and body steel structure (20), guide frame (50), I-beam guide rail (10) is fixedly installed on bridge upper surface along bridge length direction, body steel structure (20) is provided with walking mechanism for freely walking along viaduct length direction, body steel structure (20) is installed with suspension construction platform (30) below the side far from I-beam guide rail (10); Two guide frames (50) are provided, and the two guide frames (50) are installed on the two sides of the body steel structure (20), and a driving device (40) is installed between the two guide frames (50). The driving device (40) is used to drive the suspension construction platform (30) to rotate outwardly and cross obstacles through a transmission mechanism. The transmission mechanism includes a connecting steel plate (52) arranged between the two guide frames (50). The connecting steel plate (52) is provided with a hinge seat for connecting with the suspension construction platform (30) and a limiting plate (521) for limiting the maximum angle of the suspension construction platform (30) relative to the connecting steel plate (52) when rotating outwardly. The output end of the driving device (40) is connected to a transmission rod (53) through a hinge shaft. One end of the transmission rod (53) is connected to the back side of the connecting steel plate (52) through a hinge shaft. The body steel structure (20) and the guide frame (50) are both provided with a wheel assembly (22). The wheel assembly (22) is wound with a traction rope (21). The other end of the body steel structure (20) is provided with an electric winch (23). The electric winch (23) is used to tighten the traction rope (21). One end of the traction rope (21) is connected to the side of the suspension construction platform (30) away from the guide frame (50), and the other end is connected to the electric winch (23). When the connecting steel plate (52) is in a vertical state, and the suspension construction platform (30) is in a horizontal state after being affected by the electric winch (23) and the traction rope (21), the force direction of the output end of the driving device (40) is the axial direction. The connecting steel plate (52) is provided with a connecting shaft one (524) and a guide groove one (527), and the guide frame (50) is provided with a connecting shaft two (523) and a guide groove two (522). The guide groove one (527) is used for the connecting shaft two (523) to move along the length direction of the connecting steel plate (52). The guide groove two (522) is used for the connecting shaft one (524) to gradually approach the bridge when the suspension construction platform (30) rotates outwardly, and to gradually move away from the side of the bridge when the suspension construction platform (30) rotates inwardly. The top of the connecting shaft one (524) is hinged to a connecting rod (525), and the free end of the connecting rod (525) is used to install a counterweight (526) that slides left and right relative to the body steel structure (20). When the connecting shaft one (524) is at the leftmost side of the guide groove two (522) and the connecting shaft two (523) is at the topmost part of the guide groove one (527), the suspension construction platform (30) is in a vertical state. At this time, the force direction of the output end of the driving device (40) is the axial direction. When the suspension construction platform (30) moves outward, the connecting shaft one (524) is located at the rightmost side of the guide groove two (522), and the connecting shaft two (523) is located at the bottom of the guide groove one (527), so that the gravity center of the counterweight block (526) and the suspension construction platform (30) moves rightward as a whole.

2. The aerial work platform according to claim 1, wherein, The suspension construction platform (30) is provided with an elastic contact structure (31) on the side away from the guide frame (50).

3. The aerial work platform according to claim 2, wherein, The elastic contact structure (31) comprises a fixed cylinder (311) mounted on the side of the suspension construction platform (30) away from the connecting steel plate (52), a piston rod (313) and a spring (312) for flexibly mounting the piston rod (313) are mounted in the fixed cylinder (311), one end of the piston rod (313) is exposed outside the fixed cylinder (311) and is used for being pressed to the side of the bridge.

4. The aerial work platform according to claim 3, wherein, The I-beam guide rails (10) are arranged in parallel in two groups, and the sliding carriage (11) is arranged between the two groups of I-beam guide rails (10), the sliding carriage (11) comprises two symmetrically distributed sliding plates (12) and a support structure (13) for limiting the two sliding plates (12) to be located at the web regions of the corresponding I-beam guide rails (10), the sliding plate (12) is in a C-shaped structure as a whole, and the top, bottom and side of the sliding plate (12) are provided with guide wheels (14), and the support structure (13) is connected to the bottom of the body steel structure (20).

5. The aerial work platform according to claim 4, wherein, The walking mechanism comprises a hydraulic cylinder (15), the end of the piston rod (313) of the hydraulic cylinder (15) is movably provided with a crank handle (16), the crank handle (16) is rotatably connected to the bottom of the body steel structure (20), the top of one group of I-beam guide rails (10) is provided with two symmetrically arranged ratchet strips (17) through bolts, a gap is reserved between the two ratchet strips (17), a guide wheel (14) is arranged in the gap, the guide wheel (14) is arranged on the crank handle (16), and a pin shaft is arranged on the crank handle (16) on the two sides of the guide wheel (14), a rotating rod (18) is arranged on the pin shaft, a limiting shaft (19) is arranged on the free end of the rotating rod (18), the limiting shaft (19) is arranged in the tooth groove of the ratchet strip (17), and the elastic member (110) is arranged on the side close to the free end of the two rotating rods (18).

6. The aerial platform of claim 5, wherein, The piston end of the hydraulic cylinder (15) is provided with a sliding sleeve (151) through a rotating shaft, the sliding sleeve (151) is sleeved outside the crank handle (16), and the end of the crank handle (16) is provided with a limiting head (152) for limiting the maximum value of the outward movement of the sliding sleeve (151) relative to the crank handle (16).

7. A high-reach platform according to claim 6, wherein, Vertical guide grooves (55) are arranged on the opposite sides of the two guide frames (50), the connecting plates (54) are arranged in the vertical guide grooves (55), the connecting plates (54) and the output end of the driving device (40) are fixedly connected with the hinged seats of the transmission rods (53), so as to ensure that the output end of the driving device (40) stably works vertically.

8. A method of operating a high -reaching platform at a cantilevered arm of a long-span viaduct bridge according to claim 7, characterized in that, The steps are as follows: Step one: I-beam guide rail (10) installation Two parallel I-beam guide rails (10) are installed on the bridge surface by lofting, and the boundary lines are installed on the I-beam guide rails (10). The embedded anchor bolts are installed in the I-beam guide rails (10), and the I-beam guide rails (10) are installed along the length direction of the bridge through the anchor bolts. Two symmetrical ratchet strip plates (17) are installed on the top of one of the I-beam guide rails (10) through bolts, and a gap is reserved between the two ratchet strip plates (17); Step two: the body steel structure (20) and the suspended construction platform (30) are assembled The guide frames (50) are fixed on the ground through bolts or welding, the driving device (40) is installed on the body steel structure (20), the output end of the driving device (40) is connected with the connecting steel plate (52) located in the two guide frames (50) through the transmission rod (53), the connecting shaft one (524) is located in the guide groove two (522), and the connecting shaft two (523) is located in the guide groove one (527); The suspended construction platform (30) and the connecting steel plate (52) are connected through the hinged seat on the ground, the wheel assembly (22) is installed on the guide frame (50) and the body steel structure (20), the electric winch (23) is fixed at one end of the body steel structure (20) away from the guide frame (50), the free end of the traction rope (21) wound on the electric winch (23) is connected with the side of the suspended construction platform (30) away from the guide frame (50) through the wheel assembly (22), and the traction rope (21) is tightened through the electric winch (23), so that the combined body is obtained; Step three: the walking mechanism is installed The two carriages (11) are installed in the web area of the corresponding I-shaped guide rails through the support structure (13) between the two parallel I-shaped guide rails; Step four: the hoisting assembly body The assembly body is horizontally hoisted on the outer side of the bridge through the hoisting vehicle, and the support structure (13) and the body steel structure (20) are connected and fixed through bolts; Step five: crossing the bent cap block obstacle The output end of the driving device (40) drives the transmission rod (53) to rotate outward, so that the suspended construction platform (30) moves outward, the connecting shaft one (524) is located at the rightmost side of the guide groove two (522), the connecting shaft two (523) is located at the bottom of the guide groove one (527), and the center of gravity of the counterweight block (526) and the suspended construction platform (30) moves rightward as a whole; At the same time, the electric winch (23) automatically tightens the traction rope (21) during the upward movement and outward movement of the suspended construction platform (30); The two rotating rods (18) on the swing handle (16) are alternately matched with the tooth grooves on the corresponding ratchet strip plate (17) through the limiting shaft (19), so that the walking through the bent cap block along the length direction of the I-beam guide rail (10) is completed. After the blocking of the blocking blocks, the output end of the driving device (40) is lowered through the transmission rod (53) to drive the suspended construction platform (30) to be re-horizoned. When the connecting shaft one (524) is located at the leftmost side of the guide groove two (522), the connecting shaft two (523) is located at the top of the guide groove one (527), the counterweight block (526) and the gravity center of the suspended construction platform (30) are reset as a whole, the connecting steel plate (52) is vertical downward at this time, and the electric winch (23) will automatically release the traction rope (21) to keep the traction rope (21) in a tensioned state; Finally, the whole suspended construction platform (30) is driven by the walking mechanism to continuously construct along the side of the bridge between the two blocking blocks.

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