Bridge erecting machine and tunnel portal tail hole beam erecting method

Abstract

The invention provides a bridge erecting machine and a tunnel portal tail hole beam erecting method. The bridge girder erection machine comprises a machine arm, two folding supporting legs, two crane vehicles and a girder transporting vehicle. Front supporting legs are slidably arranged at the front ends of the arms, rear supporting legs are rotatably arranged at the rear ends of the arms, and the rear supporting legs are used for driving the arms to walk along the beam body; the two folding supporting legs are rotationally arranged on the two opposite sides of the vehicle arm respectively and located between the front supporting leg and the rear supporting leg, and the two folding supporting legs have the working state that the two folding supporting legs are unfolded and connected to abut against the beam body and the recovery state that the two folding supporting legs are disconnected and folded; the two crane cars are arranged at the tops of the machine arms in a sliding mode, the beam transporting car is arranged on the beam body in a sliding mode, the beam transporting car is matched with the crane car located in front to transport the tail hole beam, and the two crane cars are converted to be matched to hoist the tail hole beam in the conveying process. According to the bridge girder erection machine, the size of the bridge girder erection machine can be reduced without dismounting the supporting legs, and the tunnel passing efficiency of the bridge girder erection machine is improved; and sharp changes of stress of the arms can be relieved, and structural impact is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a bridge erection machine and a method for erecting a tunnel entrance end-hole beam. Background Art

[0002] The final span beam is the last span beam at the tunnel entrance and the final span that must be erected before the bridge-erecting machine enters the tunnel. The bridge-erecting machine operates by using its front, middle, and rear outriggers to form a support system for the machine, which then cooperates with a beam transporter and a beam hoisting trolley to hoist and erect the final span beam. Once the final span beam at the tunnel entrance is erected, the bridge-erecting machine can enter the tunnel through the entrance and move to the tunnel exit to continue erecting the beams.

[0003] In the existing technology, a fixed-point lifting process is usually selected for the installation of the last-hole beam. The beam transport vehicle transports the last-hole beam to the installation position and then the beam hoisting trolley lifts it at one time. When the bridge-erecting machine enters the tunnel, it is necessary to disassemble each leg to reduce the size of the fuselage to ensure that the bridge-erecting machine can pass through the tunnel. When the beam hoisting trolley lifts once, the weight of the beam is instantly transferred from the beam transport vehicle to the bridge-erecting machine. Especially when the beam hoisting trolley passes through the interface between the beam transport vehicle and the bridge-erecting machine, the force on the entire vehicle changes sharply, causing an impact on the bridge-erecting machine structure, which can easily lead to hidden damage or deformation of the leg structure. It is easy for each leg to get stuck or be difficult to disassemble when the bridge-erecting machine enters the tunnel entrance, which prolongs the time taken to disassemble the legs and affects the efficiency of the beam-erecting construction. Summary of the Invention

[0004] The embodiment of the present invention provides a bridge erection machine and a method for erecting a tunnel entrance end-hole beam, aiming to avoid structural damage to the bridge erection machine and improve the efficiency of beam erection.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: in the first aspect, a bridge-building machine is provided, including a machine arm, two folding legs, two cranes and a beam transporter; the machine arm is extended along the erection direction of the erected beam body, the front end of the machine arm is provided with a front leg for sliding along its length direction, and the rear end is provided with a rear leg for vertical rotation perpendicular to its length direction, the rear leg is used to drive the machine arm to move along the beam body, and the front leg is used to support in the tunnel; the two folding legs are respectively rotatably provided on opposite sides of the machine arm, and are both located between the front leg and the rear leg, the two folding legs have a working state of being opened and connected to each other to abut the beam body, and a recovery state of being disconnected and folded; the two cranes are both slidably provided on the top of the machine arm along the extension direction of the machine arm, and the two cranes are used to space front and rear and cooperate in lifting the last-hole beam to be erected; the beam transporter is slidably provided on the beam body and is located below the machine arm, and the beam transporter is used to cooperate with the crane located in front to transport the last-hole beam.

[0006] In combination with the first aspect, in a possible implementation, the folding leg includes a first cantilever, a second cantilever, a rotating drive member and a lifting element; the first cantilever is arranged on the side wall of the cantilever and is horizontally rotated perpendicular to the length direction of the cantilever; the second cantilever is arranged on the first cantilever and is axially rotated along the first cantilever; the rotating drive member is arranged on the first cantilever, and the output end is connected to the second cantilever; the lifting element is arranged on the side wall of the cantilever, located on one side of the first cantilever, and is connected to the second cantilever.

[0007] In some embodiments, a first limiting hole is provided on the side wall of the arm, and a second limiting hole is provided on one side of the first cantilever. The second limiting hole is used to align with the first limiting hole when the folding leg is in a retracted state, and is plugged in with a positioning pin.

[0008] Exemplarily, the two folding legs are connected by a support member when in working state, and the support member is fixed on the beam body and spaced apart from the machine arm.

[0009] In combination with the first aspect, in one possible implementation, a first walking drive component is provided on the top of the front support leg, and the first walking drive component is used to drive the front support leg to slide along the machine arm; a second walking drive component is provided on the bottom of the rear support leg, and the second walking drive component is used to cooperate with the first walking drive component to drive the machine arm to move along the beam body.

[0010] In some embodiments, the front support leg includes a sliding arm and a first rotating arm; the sliding arm is located at the bottom of the machine arm, and a first walking drive component is provided on the sliding arm. The sliding arm is slidingly connected to the machine arm through the first walking drive component, and a first telescopic drive component is rotatably provided on the sliding arm; the first rotating arm is hinged to the bottom of the sliding arm and connected to the output end of the first telescopic drive component.

[0011] Exemplarily, the rear support leg includes a second telescopic drive member and a second rotating arm; the second telescopic drive member is rotatably set on the machine arm; the second rotating arm is rotatably set on the machine arm and connected to the output end of the second telescopic drive member, and a second walking drive member is provided at the bottom of the second rotating arm.

[0012] The beneficial effect of the bridge-building machine provided by the present invention is that: compared with the existing technology, the present invention can form an adjustable support structure by sliding the front support legs at the front end of the machine arm and rotating the rear support legs at the rear end, and cooperate with the folding support legs that are opened and connected in the working state to enhance the overall support stability, avoid the sudden change of force during traditional single-point lifting, reduce the impact on the structure of the bridge-building machine, and reduce the risk of hidden damage to the support legs. The beam transporter and one of the cranes transport the last-hole beam by supporting and lifting, and then the two cranes lift the last-hole beam for transportation, which can gradually increase the weight of the last-hole beam to the machine arm, avoid the weight of the last-hole beam being completely transferred from the beam transporter to the machine arm in an instant, alleviate the sudden change of force at the interface, further reduce the structural impact, and ensure the structural integrity of the support legs. The folding support legs can be switched to a retractable state, and the size of the bridge-building machine can be reduced without disassembling the support legs, solving the problem of jamming and time-consuming disassembly of the support legs in traditional processes, improving the efficiency of the bridge-building machine through the tunnel, and shortening the construction period.

[0013] In a second aspect, an embodiment of the present invention further provides a method for erecting a tunnel entrance end-hole beam, based on a bridge erection machine, comprising the following steps: S100: The folding legs are in a working state of being opened and supporting the beam, and cooperate with the rear legs to support the boom, pushing the boom forward along the beam, and supporting the front legs in the tunnel; S200: The beam transporter transports the last-hole beam along the beam body. One of the cranes lifts one end of the last-hole beam and moves along the beam body with the beam transporter. When the beam transporter moves close to the folding legs, the other crane lifts the other end of the last-hole beam. The two cranes drive the last-hole beam to the beam erection position for beam erection. S300: After the last-hole beam is erected, the beam transport vehicle moves to the bottom of the boom, and the folding legs are switched to the retracted state. The beam transport vehicle carries the boom and drives it through the tunnel.

[0014] In combination with the second aspect, in a possible implementation, step S200 includes: the beam transport vehicle supports one end of the last-hole beam, one of the cranes lifts the other end of the last-hole beam, and both are transported forward along the arm; when the beam transport vehicle moves close to the folding legs, another crane lifts the end of the last-hole beam on the beam transport vehicle, and the two cranes lift the last-hole beam and move it above the beam erection position; the two cranes lift the last-hole beam through the folding legs, and control the last-hole beam to fall above the last-hole beam erection position; the last-hole beam stops falling when it falls close to the abutment, and installs the ground leg bolts at the bottom of the last-hole beam; the last-hole beam continues to be controlled to fall until it is placed on the abutment.

[0015] Exemplarily, two lifting trolleys lift the last-hole beam through the folding legs and control the last-hole beam to fall above the last-hole beam installation position, including: the two lifting trolleys pass through the folding legs and control the last-hole beam to fall until it stops near the upper surface of the beam body; the two lifting trolleys lift the last-hole beam and transport it forward along the machine arm, and vertically align the end of the last-hole beam with the end of the beam body.

[0016] The beneficial effect of the tunnel end-hole beam erection method provided by the present invention is that: compared with the existing technology, the tunnel end-hole beam erection method provided by the present invention achieves a dual improvement in construction safety and efficiency through multi-point collaborative support and segmented lifting technology. By orderly switching the support status of the front legs, rear legs and folding legs, the complicated operation of disassembling the legs before the bridge-building machine enters the tunnel in the traditional process is avoided, the problem of stuck and time-consuming leg disassembly is solved, and the construction preparation time is significantly shortened. The beam transporter and double cranes are used for collaborative operation. First, a single crane cooperates with the beam transporter to transport the beam body, and then the double cranes lift it in segments, so as to avoid the instantaneous transfer of the beam body weight from the beam transporter to the bridge-building machine, effectively alleviate the structural impact, reduce the risk of hidden damage to the legs due to sudden changes in force, and improve the structural stability of the bridge-building machine. After the beam erection is completed, the beam transport vehicle carries the machine arm directly through the tunnel, and the folded legs are used to retract the machine body to reduce its size. The bridge erection machine can pass through the tunnel without removing the legs, which can improve construction efficiency, ensure the continuity of the beam erection operation, and shorten the overall construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic front view of the structure of a bridge erection machine provided in an embodiment of the present invention; Figure 2 A schematic side view of the folding legs used in an embodiment of the present invention in a working state; Figure 3 This is a front view structural diagram of the folding legs used in an embodiment of the present invention in a retracted state; Figure 4 This is a front structural schematic diagram of the front support leg used in an embodiment of the present invention; Figure 5 This is a front view structural diagram of the rear support legs used in an embodiment of the present invention; Figure 6 The front view structure of the bridge erection machine in step S100 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 1 ; Figure 7 The front view structure of the bridge erection machine in step S100 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 2 ; Figure 8 The front view structure of the bridge erection machine in step S100 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 3 ; Figure 9 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 1 ; Figure 10 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 2 ; Figure 11 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 3 ; Figure 12 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 4 ; Figure 13 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 5 ; Figure 14 The front view structure of the bridge erection machine in step S200 of the tunnel end beam erection method provided by the embodiment of the present invention Figure 6 ; Figure 15 A front structural diagram of the bridge erection machine in step S300 of the tunnel portal end beam erection method provided by an embodiment of the present invention; In the figure: 10, machine arm; 11, first limiting hole; 20, front support leg; 21, first travel drive member; 22, sliding arm; 23, first telescopic drive member; 24, first rotating arm; 25, anchor member; 30, rear support leg; 31, second travel drive member; 32, second telescopic drive member; 33, second rotating arm; 40, folding support leg; 41, first cantilever; 411, second limiting hole; 42, second cantilever; 43, rotating drive member; 44, lifting element; 45, support member; 50, crane truck; 60, beam transporter; 70, beam body; 80, end-hole beam; 90, tunnel. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", etc., indicating an orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0020] Please also refer to Figures 1 to 5 The bridge erection machine provided by the present invention is now described. The bridge erection machine includes a machine arm 10, two folding legs 40, two cranes 50 and a beam transporter 60; the machine arm 10 is extended along the erection direction of the erected beam body 70, the front end of the machine arm 10 is provided with a front leg 20 that slides along its length direction, and the rear end is provided with a rear leg 30 that rotates vertically perpendicular to its length direction. The rear leg 30 is used to drive the machine arm 10 to move along the beam body 70, and the front leg 20 is used to support it in the tunnel 90; the two folding legs 40 are respectively rotatably provided on opposite sides of the machine arm 10, and both are provided with a rear leg 30 that rotates vertically perpendicular to its length direction. Located between the front support legs 20 and the rear support legs 30, the two folding legs 40 have a working state of being opened and connected to each other to abut the beam body 70, and a recovery state of being disconnected and folded; the two cranes 50 are both slidably set on the top of the arm 10 along the extension direction of the arm 10, and the two cranes 50 are used to space front and back and cooperate in lifting the end-hole beam 80 to be erected; the beam transporter 60 is slidably set on the beam body 70 and is located under the arm 10, and the beam transporter 60 is used to cooperate with the crane 50 located in the front to transport the end-hole beam 80.

[0021] It should be noted that the boom 10, as the main structure, extends along the direction of the beam 70 installation and provides a mounting base. The front legs 20 are slidably mounted on the front bottom of the boom 10 and can move along the length of the boom 10, providing fixed support for the front end of the boom 10 during the beam erection. The rear legs 30 are pivotally mounted on the rear bottom of the boom 10 and perpendicular to its length, enabling forward movement of the boom 10 along the erected beam 70, allowing for adjustment of the boom 10's position. The front legs 20 extend into the tunnel 90 with the boom 10 and provide support, securing the boom 10 at both ends of the final beam 80 installation location. When in operation, the two folding legs 40 are extended and interconnected, abutting the beam 70. Together with the front and rear legs 30, they form a multi-point support system, distributing the load on the bridge erection machine. When retracted, the two folding legs 40 disconnect and retract, reducing the lateral dimensions of the boom 10 and facilitating forward movement or passage through the tunnel 90.

[0022] Compared with the prior art, the bridge-building machine provided by the present invention has a front support leg 20 slidingly arranged at the front end of the machine arm 10 and a rear support leg 30 rotatably arranged at the rear end, which can form an adjustable support structure. The overall support stability is enhanced by the folding support legs 40 that are opened and connected in the working state, which can avoid the sudden change of force during traditional single-point lifting, reduce the impact on the bridge-building machine structure, and reduce the risk of hidden damage to the support legs.

[0023] The folding legs 40 can be switched to a retractable state, and the size of the bridge-building machine can be reduced without disassembling the legs. This solves the problem of jamming and time-consuming leg disassembly in traditional processes, improves the efficiency of the bridge-building machine passing through the tunnel 90, and shortens the construction period.

[0024] Two cranes 50 slide along the top of the boom 10, cooperating with the beam transporter 60 to transport and install the final beam 80. First, the beam transporter 60 transports the final beam 80 to the bottom of the boom 10. One of the cranes 50 lifts one end of the beam 70, moving with the crane 60. When the crane 60 approaches the folding legs 40, it is unable to pass because the two folding legs 40 are connected and abut the upper surface of the beam 70. The other crane 50 then lifts the other end of the beam 70, and the two cranes 50 work together to move the beam 70 to the beam erection position.

[0025] The beam transporter 60 and one of the cranes 50 transport the last-hole beam 80 by supporting and hoisting, and then the two cranes 50 hoist the last-hole beam 80 for transportation. This can gradually increase the weight of the last-hole beam 80 to the boom 10, avoiding the weight of the last-hole beam 80 being instantly transferred from the beam transporter 60 to the boom 10, alleviating the sharp change in force at the interface, further reducing the structural impact, and ensuring the structural integrity of the support legs.

[0026] See also Figure 2 and Figure 3 The folding leg 40 includes a first cantilever 41, a second cantilever 42, a rotary drive member 43 and a lifting element 44; the first cantilever 41 is arranged on the side wall of the arm 10 for horizontal rotation perpendicular to the length direction of the arm 10; the second cantilever 42 is arranged on the first cantilever 41 for axial rotation along the first cantilever 41; the rotary drive member 43 is arranged on the first cantilever 41, and the output end is connected to the second cantilever 42; the lifting element 44 is arranged on the side wall of the arm 10, located on one side of the first cantilever 41, and connected to the second cantilever 42.

[0027] It should be noted that the rotary drive member 43 can be a tilting cylinder and the lifting element 44 can be a crane. When the folding support leg needs to enter the working state, the first cantilever 41 is rotated horizontally from the side wall of the arm 10 perpendicular to the length direction of the arm 10 to form a preliminary support structure. The rotary drive member 43 is started, driving the second cantilever 42 to rotate along the axial direction of the first cantilever 41, adjusting its extension angle so that the end of the second cantilever 42 abuts the beam body 70 or the support member 45 to form a stable support point. When the folding support leg needs to be switched to the recovery state, the first cantilever 41 is horizontally rotated toward the side wall of the arm 10 perpendicular to the length direction of the arm 10, and the rotary drive member 43 moves in the opposite direction, driving the second cantilever 42 to fold and recover along the axial direction of the first cantilever 41, close to the first cantilever 41. The second cantilever 42 after rotation is fixed by the lifting element 44 so that the second cantilever 42 remains in the folded state.

[0028] The first cantilever 41 is rotatably connected to the second cantilever 42, and the support angle can be adjusted according to the position of the beam body 70 and the terrain of the tunnel 90 entrance to adapt to different construction scenarios. Compared with the fixed legs in the prior art, the weight of the arm 10 and the beam body 70 can be more evenly distributed, reducing the structural impact caused by single-point force. The folding legs 40 can be quickly switched to a retracted state without the need to disassemble the leg components, avoiding the jamming problem caused by the difficulty in disassembling the legs in the prior art, shortening the preparation time for the bridge crane to enter the tunnel 90, and improving construction efficiency. After folding, the structure is compact, reducing the overall width and height of the bridge crane, ensuring that it can smoothly pass through the entrance of the tunnel 90 without the need for additional operations to reduce the size of the fuselage. When the end-hole beam 80 is erected, the folding legs 40 can be connected to the support member 45 after unfolding to form a temporary support point to assist the crane 50 in transporting and lifting the beam body 70.

[0029] See also Figure 2 and Figure 3 A first limiting hole 11 is provided on the side wall of the arm 10, and a second limiting hole 411 is provided on one side of the first cantilever 41. The second limiting hole 411 is used to align with the first limiting hole 11 when the folding leg 40 is in a retracted state, and is plugged in through a positioning pin.

[0030] It should be noted that when the folding leg 40 needs to be switched from the working state to the retracted state, the first cantilever 41 and the second cantilever 42 are first folded by rotating the drive member 43, and the first cantilever 41 is retracted toward the side wall of the arm 10. When the folding leg 40 is in the retracted state, the second retaining hole 411 on the first cantilever 41 is precisely aligned with the first retaining hole 11 on the side wall of the arm 10. At this time, a locating pin is inserted through the two holes to form a mechanical lock, securing the folding leg 40 to the arm 10. The locating pin acts as a rigid connector, preventing the first cantilever 41 from rotating relative to the arm 10, ensuring the leg remains stable in the retracted state and preventing accidental deployment of the leg due to factors such as vibration and movement.

[0031] See also Figure 2 When in working state, the two folding legs 40 are connected by a support member 45 , which is fixed on the beam body 70 and spaced apart from the machine arm 10 .

[0032] It should be noted that the support member 45 can be a rigid crossbeam. Before the bridge erection machine erects the beam body 70, the support member 45 is first fixed to the erected beam body 70, and the support member 45 maintains a preset distance from the arm 10. The folding legs 40 on both sides are unfolded, and the end of the second cantilever 42 is connected to the support member 45 by bolts. The weight of the beam body 70 and the lifting load borne by the arm 10 are transferred to the support member 45 through the folding legs 40, and then distributed to the beam body 70 structure by the support member 45. After the folding legs 40 on both sides are connected by the support member 45, they can restrain each other from lateral displacement, avoid tilting of a single leg due to eccentric load, and ensure the horizontality of the arm 10. In addition, the support member 45 and the arm 10 are spaced apart, and the crane 50 can lift the end-hole beam 80 through the gap between the support member 45 and the arm 10 to avoid affecting the erection of the beam.

[0033] See also Figure 4 and Figure 5 A first travel drive member 21 is provided at the top of the front support leg 20, and the first travel drive member 21 is used to drive the front support leg 20 to slide along the machine arm 10; a second travel drive member 31 is provided at the bottom of the rear support leg 30, and the second travel drive member 31 is used to cooperate with the first travel drive member 21 to drive the machine arm 10 to move along the beam body 70.

[0034] It should be noted that the first travel drive member 21 can be a hydraulic motor or a servo motor, which is installed on the top of the front support leg 20 and is connected to the support wheel through the output end to drive the front support leg 20 to slide along the track in the length direction of the machine arm 10. When the position of the front support leg 20 needs to be adjusted, the drive member outputs power to move the front support leg 20 on the machine arm 10, and is able to enter the tunnel 90 and support it, thereby realizing flexible adjustment of the span of the front support leg 20. The second travel drive member 31 is arranged at the bottom of the rear support leg 30, and can be a crawler with a drive wheel, which cooperates with the track on the top surface of the beam body 70. When the folding leg 40 is in a working state to support the beam body 70, the machine arm 10 is driven forward by the second travel drive member 31, so that the machine arm 10 is located above the installation position of the last hole beam 80, providing a working space for the subsequent installation of the last hole beam 80.

[0035] The front legs 20 can be fixed to the already-erected beam 70. The coordinated operation of the first and second travel drive members 31 allows the boom 10 to be moved along the beam 70, eliminating the need for additional traction equipment and adapting to complex terrain such as tunnel entrances and mountainous areas. The front legs 20 are slidably connected to tracks at the bottom of the boom 10, while the rear legs 30 are slidably connected to tracks on the beam 70. Both the first and second travel drive members 21, 31 are equipped with lateral stoppers to prevent the front and rear legs 20, 30 from derailing.

[0036] See also Figure 4 The front support leg 20 includes a sliding arm 22 and a first rotating arm 24; the sliding arm 22 is located at the bottom of the machine arm 10, and a first traveling driving member 21 is provided on the sliding arm 22. The sliding arm 22 is slidingly connected to the machine arm 10 through the first traveling driving member 21, and a first telescopic driving member 23 is rotatably provided on the sliding arm 22; the first rotating arm 24 is hinged to the bottom of the sliding arm 22 and is connected to the output end of the first telescopic driving member 23.

[0037] It should be noted that the first telescopic drive member 23 can be a hydraulic cylinder; one end is hinged to the side of the sliding arm 22 and can rotate about the hinge point; the other end is hinged to the middle or end of the first rotating arm 24. When the first telescopic drive member 23 is extended or retracted, its output end pushes or pulls the first rotating arm 24, causing the first rotating arm 24 to rotate about the sliding arm 22. If the first telescopic drive member 23 extends, it pushes the first rotating arm 24 downward about its hinge point with the sliding arm 22, causing the support point at the end of the first rotating arm 24 to contact the ground. If the first telescopic drive member 23 shortens, it drives the first rotating arm 24 to rotate upward and retract. When the front leg 20 needs to slide on the arm 10, the first rotating arm 24 is rotated upward to prevent the beam 70 from blocking the movement of the front leg 20.

[0038] See Figure 4Anchors 25 may be provided on the front legs 20. When the boom 10 needs to move forward, the first pivot arm 24 is fixed to the abutment of the beam 70, and the anchors 25 are fixed to the beam 70. At this point, the front legs 20 are fixed to the beam 70, and the boom 10 moves above the front legs 20. When the front end of the boom 10 extends into the entrance of the tunnel 90, the anchors 25 are released from the beam 70, and the first pivot arm 24 rotates about the slide arm 22. The slide arm 22 slides along the boom 10 to the front end of the boom 10 and is supported within the tunnel 90. The rotation of the first pivot arm 24 about the slide arm 22 can change the length of the front legs 20, thereby changing the support height of the boom 10.

[0039] See also Figure 5 The rear support leg 30 includes a second telescopic driving member 32 and a second rotating arm 33; the second telescopic driving member 32 is rotatably set on the machine arm 10; the second rotating arm 33 is rotatably set on the machine arm 10 and is connected to the output end of the second telescopic driving member 32, and a second walking driving member 31 is provided at the bottom of the second rotating arm 33.

[0040] It should be noted that the second telescopic drive member 32 can be a hydraulic cylinder, one end of which is hinged to the side of the boom 10 and can rotate about the hinge point; the other end is hinged to the middle of the second pivot arm 33. When the second telescopic drive member 32 is extended or retracted, it drives the second pivot arm 33 about its hinge point with the boom 10 through thrust or tension, thereby adjusting the angle of the second pivot arm 33. When the boom 10 needs to move forward, the second telescopic drive member 32 extends, pushing the second pivot arm 33 downward, causing the second travel drive member 31 at the bottom of the pivot arm to contact the beam body 70. When the beam transport vehicle 60 transports the end-hole beam 80, the drive member shortens, driving the pivot arm upward to provide space for the beam transport vehicle 60 to move.

[0041] Please also refer to Figures 6 to 15 The embodiment of the present invention further provides a method for erecting a tunnel entrance end beam, based on a bridge erection machine, comprising the following steps: S100: The folding legs 40 are in an open working state supporting the beam 70 , cooperating with the rear legs 30 to support the boom 10 , pushing the boom 10 forward along the beam 70 , and supporting the front legs 20 in the tunnel 90 ; S200: The beam transport vehicle 60 transports the last-hole beam 80 along the beam body 70. One of the cranes 50 lifts one end of the last-hole beam 80 and moves along the beam body 70 with the beam transport vehicle 60. When the beam transport vehicle 60 moves close to the folding legs 40, the other crane 50 lifts the other end of the last-hole beam 80. The two cranes 50 drive the last-hole beam 80 to the beam erection position for beam erection. S300: After the last-hole beam 80 is erected, the beam transport vehicle 60 moves to the bottom of the boom 10 , the folding legs 40 are switched to the retracted state, and the beam transport vehicle 60 carries the boom 10 and drives the boom 10 through the tunnel 90 .

[0042] It should be noted that, referring to Figure 6 The front support legs 20 are fixed on the abutment of the beam body 70 behind the beam erection position to form a fixed fulcrum; the rear support legs 30 and the unfolded folding support legs 40 are supported on the erected beam body 70 to form a central support system; the two cranes 50 are parked at the rear end of the machine arm 10 to balance the center of gravity of the entire machine.

[0043] Reference Figure 7 The folding legs 40 are retracted to a retracted position, reducing the lateral dimensions of the bridge crane. The rear legs 30 drive the boom 10 forward along the beam 70 until the front end of the boom 10 extends into the entrance of the tunnel 90. By utilizing the self-propelled function of the rear legs 30 and the retractable nature of the folding legs 40, the boom 10 can be moved forward without disassembling the legs, thereby improving construction efficiency.

[0044] Reference Figure 8 The folded support legs 40 are unfolded again and supported on the beam body 70, restoring the middle support; the front support legs 20 slide to the front end along the machine arm 10 and are supported on the abutment or beam body 70 at the entrance of the tunnel 90, forming support at the front end of the tunnel 90 and the middle of the beam body 70.

[0045] Reference Figures 9 to 14 , the two cranes 50 drive the last hole beam 80 to move to the beam erection position to complete the erection of the last hole beam 80.

[0046] Reference Figure 15 With the folding legs 40 in the retracted state, the beam transporter 60 moves under the boom 10 to provide support, driving the boom 10 as a whole through the tunnel 90 without removing the legs. The beam transporter 60 serves as a temporary support platform, combined with the retracted legs, to enable the bridge erection machine to pass through the tunnel 90.

[0047] Compared to existing technologies, the tunnel portal end-hole beam erection method provided by the present invention achieves both improved construction safety and efficiency through multi-point coordinated support and a segmented hoisting process. By sequentially switching the support states of the front legs 20, rear legs 30, and folding legs 40, the complex operation of disassembling the legs before the bridge erection machine enters the tunnel 90, as in traditional processes, is avoided. This solves the problem of delayed and time-consuming leg disassembly and significantly shortens construction preparation time.

[0048] The beam transport vehicle 60 and the double crane vehicles 50 work together. First, a single crane vehicle 50 cooperates with the beam transport vehicle 60 to transport the beam body 70, and then the double crane vehicles 50 lift it in sections, so as to avoid the weight of the beam body 70 being completely transferred from the beam transport vehicle 60 to the bridge-building machine in an instant, effectively alleviating the structural impact, reducing the risk of hidden damage to the support legs due to sudden changes in force, and improving the structural stability of the bridge-building machine.

[0049] After the beam erection is completed, the beam transport vehicle 60 carries the arm 10 directly through the tunnel 90, and the folding legs 40 are used to retract to reduce the size of the fuselage. The bridge erection machine can pass through the tunnel 90 without removing the legs, which can improve construction efficiency, ensure the continuity of the beam erection operation, and shorten the overall construction period.

[0050] See also Figures 9 to 14 Step S200 includes: the beam transporter 60 supports one end of the last-hole beam 80, one of the cranes 50 lifts the other end of the last-hole beam 80, and both are transported forward along the arm 10; when the beam transporter 60 moves close to the folding legs 40, another crane 50 lifts the end of the last-hole beam 80 on the beam transporter 60, and the two cranes 50 lift the last-hole beam 80 and move it above the beam erection position; the two cranes lift the last-hole beam 80 through the folding legs 40, and control the last-hole beam 80 to fall above the last-hole beam 80 erection position; the last-hole beam 80 stops falling when it falls close to the abutment, and the ground leg bolts are installed at the bottom of the last-hole beam 80; the last-hole beam 80 continues to be controlled to fall until the last-hole beam 80 is placed on the abutment.

[0051] It should be noted that, see Figure 9 The beam transport vehicle 60 supports one end of the end-hole beam 80 , and one of the cranes 50 lifts the other end of the end-hole beam 80 , and the two move forward synchronously along the machine arm 10 .

[0052] See Figure 10 When the beam transport vehicle 60 moves to the vicinity of the folding legs 40, another crane 50 hoists the other end of the end-hole beam 80, and the double cranes 50 cooperate to move the end-hole beam 80 to above the beam erection position.

[0053] See Figure 13 , two cranes 50 lift the last hole beam 80 through the folding legs 40, and stop when it drops to 10-20 cm away from the abutment; install the ground leg bolts at the bottom of the last hole beam 80 to fix the position of the last hole beam 80; continue to drop the beam to fully anchor the bolts, and realize the erection of the last hole beam 80.

[0054] See Figure 14 When the bottom of the last hole beam 80 is close to the top surface of the pad stone on the abutment, stop lowering the beam, use a plumb line to guide the centering according to the support cross line on the pad stone surface, monitor and check the displacement of the support center, adjust the position of the beam body 70 front and back and left and right so that the center line of the beam body 70 support is aligned with the cross line of the pad stone, and the bottom of the last hole beam 80 coincides with the center line of the pad stone.

[0055] See also Figures 10 to 12The two lifting trolleys lift the last-hole beam 80 through the folding legs 40 and control the last-hole beam 80 to fall above the installation position of the last-hole beam 80, including: the two lifting trolleys pass through the folding legs 40, and control the last-hole beam 80 to fall close to the upper surface of the beam body 70 and stop falling; the two lifting trolleys lift the last-hole beam 80 and transport it forward along the machine arm 10, and make the end of the last-hole beam 80 vertically aligned with the end of the beam body 70.

[0056] It should be noted that, see Figure 10 and Figure 11 After the double crane 50 hoists the last hole beam 80 and moves it above the folding legs 40, it first controls the last hole beam 80 to fall to a position 10-20 cm away from the upper surface of the erected beam body 70 and stops.

[0057] See Figure 12 The two cranes 50 keep the final beam 80 suspended and slowly move forward along the boom 10. Using a laser rangefinder or a visual positioning system, the end of the final beam 80 is vertically aligned with the end of the already erected beam 70. This multiple-drop method improves the accuracy of final beam 80 erection and enhances construction quality.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Bridge erecting machine, characterized in that, include: The machine arm is extended along the erection direction of the erected beam body, the front end of the machine arm is provided with a front support leg for sliding along the length direction, and the rear end is provided with a rear support leg for vertical rotation perpendicular to the length direction. The rear support leg is used to drive the machine arm to move along the beam body, and the front support leg is used to support the machine arm in the tunnel; Two folding legs are rotatably disposed on opposite sides of the machine arm and are both located between the front leg and the rear leg, the two folding legs having a working state of being opened and connected to each other to abut against the beam body, and a retracted state of being disconnected and folded; Two cranes are both slidably arranged on the top of the arm along the extension direction of the arm, and the two cranes are used to space each other front and back and cooperate to lift the end-hole beam to be erected; The beam transport vehicle is slidably arranged on the beam body and is located below the machine arm. The beam transport vehicle is used to cooperate with the crane vehicle located in the front to transport the end-hole beam.

2. The bridge erecting machine according to claim 1, characterized in that: The folding legs include: A first cantilever, arranged to rotate horizontally and perpendicularly to the length direction of the arm and on the side wall of the arm; a second cantilever, rotatably disposed on the first cantilever along the axis of the first cantilever; a rotary driving member, disposed on the first cantilever, with an output end connected to the second cantilever; The lifting element is arranged on the side wall of the machine arm, located on one side of the first cantilever, and connected to the second cantilever.

3. The bridge erecting machine according to claim 2, characterized in that: The side wall of the machine arm is provided with a first limiting hole, and a second limiting hole is provided on one side of the first cantilever. The second limiting hole is used to align with the first limiting hole when the folding leg is in the retracted state, and is plugged in with a positioning pin.

4. The bridge erecting machine according to claim 2, characterized in that: The two folding legs are connected by a support member when in the working state. The support member is fixed on the beam body and is spaced apart from the machine arm.

5. The bridge erecting machine according to claim 1, characterized in that: A first travel drive member is provided on the top of the front support leg, and the first travel drive member is used to drive the front support leg to slide along the machine arm; a second travel drive member is provided on the bottom of the rear support leg, and the second travel drive member is used to cooperate with the first travel drive member to drive the machine arm to move along the beam body.

6. The bridge erecting machine according to claim 5, characterized in that: The front legs include: a sliding arm, located at the bottom of the machine arm, provided with the first travel drive member, the sliding arm being slidably connected to the machine arm via the first travel drive member, and a first telescopic drive member being rotatably provided on the sliding arm; The first rotating arm is hinged to the bottom of the sliding arm and connected to the output end of the first telescopic driving member.

7. The bridge erecting machine according to claim 6, characterized in that: The rear legs include: a second telescopic driving member, rotatably disposed on the machine arm; The second rotating arm is rotatably arranged on the machine arm and is connected to the output end of the second telescopic driving member. The second traveling driving member is provided at the bottom of the second rotating arm.

8. A method for erecting a tunnel entrance end beam, based on the bridge erection machine according to any one of claims 1 to 7, characterized in that: The following steps are involved: S100: The folding legs are in a working state of being opened and supporting the beam, and cooperate with the rear legs to support the boom, pushing the boom forward along the beam, and supporting the front legs in the tunnel; S200: The beam transport vehicle transports the last-hole beam to be erected along the beam body, one of the cranes lifts one end of the last-hole beam and moves along the beam body with the beam transport vehicle. When the beam transport vehicle moves close to the folding legs, the other crane lifts the other end of the last-hole beam. The two cranes drive the last-hole beam to the beam erection position for beam erection. S300: After the last-hole beam is erected, the beam transport vehicle moves to the bottom of the boom, the folding legs are switched to a retracted state, and the beam transport vehicle carries the boom and drives the boom through the tunnel.

9. The method for erecting the tunnel entrance end beam according to claim 8, characterized in that: Step S200 includes: The beam transport vehicle supports one end of the last hole beam, and one of the crane vehicles lifts the other end of the last hole beam, and both are transported forward along the machine arm; When the beam transport vehicle moves close to the folding legs, another crane lifts the end of the last-hole beam on the beam transport vehicle, and the two cranes lift the last-hole beam and move it above the beam erection position; The two lifting trolleys lift the last hole beam through the folding legs and control the last hole beam to fall above the last hole beam installation position; When the last hole beam falls close to the abutment, the beam is stopped from falling, and a ground bolt is installed at the bottom of the last hole beam; Continue to control the last hole beam to fall until the last hole beam is placed on the abutment.

10. The method for erecting the tunnel entrance end beam according to claim 9, characterized in that: The two lifting trolleys hoist the last-hole beam through the folding legs and control the last-hole beam to fall above the last-hole beam installation position, including: The two lifting trolleys pass through the folding legs and control the end-hole beam to drop close to the upper surface of the beam body and stop dropping the beam; The two lifting trolleys lift the last-hole beam and transport it forward along the machine arm, and make the end of the last-hole beam vertically aligned with the end of the beam body.

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