Construction method for rapid installation and disassembly of segmented leading girders by incremental launching method

Abstract

The present invention relates to the technical field of bridge construction, and particularly to a construction method for rapid installation and disassembly of a segmented leading girder by the incremental launching method, which comprises the following steps: jack up the first steel girder and push it towards the tunnel. When launching the first bridge section, construct the second bridge section in the tunnel so that the second bridge section extends out of the tunnel; when the first bridge section approaches the part of the segmented leading girder that extends out of the tunnel near the second bridge section, disassemble the segmented leading girder section by section. After all the segmented leading girders are removed, weld between the first bridge section and the second bridge section. The construction method for rapid installation and disassembly of the segmented leading girder by the incremental launching method of the present invention can construct the first bridge section and the second bridge section synchronously, improve the overall construction efficiency, and reduce the difficulty in docking the first bridge section and the second bridge section; at the same time, a crane can be installed on the part of the second bridge section that extends out of the tunnel, which is convenient for disassembling and transporting the segmented leading girder; in addition, the segmented leading girder can reduce the difficulty of hoisting and conveying, and reduce the space occupied during the disassembly of the leading girder.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a method for quickly installing and disassembling a segmented leading girder by the incremental launching method. Background Art

[0002] The incremental launching method refers to a method in which when a structure needs to pass above an existing railway embankment, in order not to disturb the existing line, the structure can be built in segments on one side of the embankment and then jacked through the embankment with jacks.

[0003] Refer to Figure 1 , in which the first bridge section 1 needs to cross the highway 3 and extend into the tunnel 2, and needs to be docked with the second bridge section in the tunnel 2. Both the first bridge section 1 and the second bridge section are steel bridges. In order not to affect the use of the highway 3 below, the incremental launching method is used for construction, that is, a launching support and launching equipment are set on the side of the highway 3 far from the tunnel 2, the first bridge section 1 is placed on the launching support so that the first bridge section 1 is higher than the highway 3, and then the first bridge section 1 is pushed towards the tunnel 2 by the launching equipment. Multiple groups of launching supports are arranged at intervals along the launching route. In order to reduce the maximum cantilever length of the first bridge section 1, thereby reducing the internal force at the front end of the first bridge section 1 during the launching construction and playing a guiding role, the front end of the first bridge section 1 needs to be connected to the leading girder 4.

[0004] Generally, an integrated leading girder is used in the incremental launching method and is disassembled after the launching is completed. However, in this project, the terrain between the highway and the tunnel is relatively harsh and the construction site is narrow, making it difficult to disassemble the leading girder and transport it. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a method for quickly installing and disassembling a segmented leading girder by the incremental launching method.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a method for quickly installing and disassembling a segmented leading girder by the incremental launching method, including the following steps:

[0007] S1. Install the launching support and the launching equipment along the launching route;

[0008] S2. Hoist the first steel girder section of the first bridge section onto the launching support and connect a segmented leading girder to the end of the first steel girder section facing the tunnel;

[0009] S3. The launching equipment works to lift the first steel girder section and push it towards the tunnel. The launching equipment continues to work until one incremental launching is completed. When launching the first bridge section, construct the second bridge section in the tunnel so that the second bridge section extends out of the tunnel;

[0010] S4. After one jacking push is completed, a rear-section steel beam is welded to one end of the first-section steel beam of the first bridge section that is far from the sectional front guide beam, and then S3 is repeated until the sectional front guide beam approaches the part of the second bridge section extending out of the tunnel.

[0011] S5. At the part of the second bridge section extending out of the tunnel, the sectional front guide beam is hoisted by a crane, and the sectional front guide beam is disassembled section by section. After each section of the front guide beam is removed, the jacking equipment jacks the first bridge section to move a distance equal to the length of one section of the front guide beam until all the front guide beams are removed. The removed front guide beams are transported through the second bridge section.

[0012] S6. After all the sectional front guide beams are removed, the jacking equipment continues to jack the first bridge section so that the first bridge section abuts against the second bridge section, and the welding between the first bridge section and the second bridge section is completed, thus completing the construction.

[0013] In the sectional quick installation and disassembly construction method of the front guide beam by the jacking method of the present invention, while the jacking construction of the first bridge section is carried out, the construction of the second bridge section is carried out, so that a part of the second bridge section extends out of the tunnel. On the one hand, the overall construction efficiency can be improved, and the difficulty in docking the first bridge section and the second bridge section can be reduced; on the other hand, a crane can be installed at the part of the second bridge section extending out of the tunnel, which is convenient for disassembling the sectional front guide beam; on the third hand, the disassembled front guide beam can be directly transported away through the second bridge section; and the setting of the sectional front guide beam, on the one hand, can reduce the difficulty of hoisting and conveying, on the second hand, can reduce the space occupied when the front guide beam is disassembled, thus leaving space for the part where the second bridge section extends, facilitating the synchronous construction of the first bridge section and the second bridge section, and improving the overall construction efficiency; on the third hand, the sectional front guide beam is more convenient to disassemble and assemble, and can be reused, which can greatly save the cost.

[0014] Further, specifically, the sectional front guide beam includes multiple sections of front guide beams, and adjacent front guide beams are connected through a connecting component.

[0015] Each section of the front guide beam includes two I-beams and a strengthening beam arranged between the I-beams, and the I-beams are welded to the strengthening beam.

[0016] Furthermore, the connecting component includes a connecting frame, one end of the connecting frame in the second direction is located between the two I-beams of a section of leading beam, and the other end is located between the two I-beams of another section of leading beam; a fixing plate, the fixing plate is fixedly connected to the connecting frame, and there are two oppositely arranged along the first direction, and each fixing plate is simultaneously abutted against the top surfaces of two adjacent I-beams along the second direction; a rotating plate, there are two rotating plates, each rotating plate is hinged to one of the fixing plates, and the two rotating plates are respectively abutted against the opposite ends of two adjacent I-beams along the first direction; a limiting plate, there are two limiting plates, each limiting plate is fixedly connected to one of the rotating plates, and each limiting plate is simultaneously abutted against the bottom surfaces of two adjacent I-beams along the second direction; a connecting piece, the connecting piece is arranged on the connecting frame and connects the limiting plate and the connecting frame; the connecting frame, the fixing plate, the rotating plate and the limiting plate simultaneously wrap a part of the two adjacent I-beams along the second direction to realize the connection between two adjacent sections of leading beams, and connecting plates are arranged on the top and bottom surfaces of each I-beam, and connection grooves for inserting the connecting plates are arranged on the fixing plate and the limiting plate.

[0017] Furthermore, the connecting piece includes an integrated plate and a limiting rod connected to the bottom surface of the integrated plate, the integrated plate is placed on the connecting frame, and the limiting rod sequentially passes through the connecting frame and the limiting plate from top to bottom so that the limiting plate is fixed relative to the connecting frame.

[0018] Furthermore, support blocks are arranged at the opposite ends of the two I-beams, and the support blocks are located in the grooves on the side surfaces of the I-beams.

[0019] Furthermore, a steel wire rope is connected between the two support blocks, and a pull rod is connected to the bottom surface of the integrated plate, and the steel wire rope passes through the pull rod, so that when the integrated plate moves upward, the steel wire rope is driven to move, and finally the support block is separated from the groove on the side wall of the I-beam.

[0020] Furthermore, an anti-detachment plate is connected to the side wall of the limiting rod, and a clamping plate for abutting against the anti-detachment plate is connected to the top of the connecting frame. After the support block is separated from the groove on the side wall of the I-beam and the limiting rod is separated from the limiting plate, the anti-detachment plate abuts against the clamping plate.

[0021] Furthermore, a top support block is connected to the end of the rotating plate facing the I-beam, and the top support block abuts against the side wall of the I-beam.

[0022] Furthermore, a strengthening plate is placed on the fixing plate, and a first strengthening rod and a second strengthening rod are connected to the bottom surface of the strengthening plate. The first strengthening rod passes through the fixing plate, the I-beam, the top support block and the limiting plate, and the second strengthening rod passes through the fixing plate, the I-beam, the support block and the limiting plate.

[0023] Furthermore, a deflection prevention plate is connected to one end of the leading beam connected to the first section of steel beam, and the end of the deflection prevention plate away from the leading beam is inserted into the first section of steel beam.

[0024] The beneficial effects of the present invention are as follows.

[0025] 1. While jacking and constructing the first bridge section, the second bridge section is constructed, so that a part of the second bridge section extends out of the tunnel. On the one hand, the overall construction efficiency can be improved, and the difficulty of docking between the first bridge section and the second bridge section can be reduced; on the other hand, a crane can be installed on the part of the second bridge section extending out of the tunnel, which is convenient for disassembling the segmented leading beam; on the third hand, the disassembled leading beam can be directly transported away through the second bridge section; and the setting of the segmented leading beam can, on the one hand, reduce the difficulty of hoisting and conveying, and on the other hand, reduce the space occupied during the disassembly of the leading beam, thus leaving space for the part where the second bridge section extends, facilitating the synchronous construction of the first bridge section and the second bridge section, and improving the overall construction efficiency.

[0026] 2. Through the settings of the connecting frame, fixing plate, rotating plate, limiting plate and connecting plate, while wrapping the two I-beams, the relative fixation of the two I-beams is also achieved. At the same time, after the rotating plate rotates, the whole connecting frame can be removed, realizing rapid disassembly, improving the construction efficiency, and not using bolts, nuts or welding methods, so the installation efficiency can be greatly improved, and rapid installation can be achieved.

[0027] 3. Through the settings of the support block, jacking block, strengthening rod and strengthening plate, the limitation and supporting force of the I-beam are improved, and then the connection strength between adjacent I-beams is improved.

[0028] 4. Through the settings of the limiting rod, pull rod, steel wire rope, anti-disengagement plate and clamping plate, when the integrated plate is lifted, the limiting rod first disengages from the limiting plate, and then the pull rod pulls the steel wire rope upward, so that the support block disengages from the groove on the side wall of the I-beam. Subsequently, the anti-disengagement plate abuts against the clamping plate, and the integrated plate drives the whole connecting frame to move upward. After the limiting plate is separated from the limiting rod, due to the center of gravity, it rotates downward, making the limiting plate inclined relative to the bottom surface of the I-beam. As the connecting frame moves upward, the limiting plate gradually abuts against the edge line of the bottom surface of the I-beam, and gradually continues to rotate under the influence of the I-beam, so that the limiting plate is gradually completely separated from the bottom surface of the I-beam during the upward movement, realizing the separation of the connecting component from the I-beam, and finally realizing the rapid disassembly of a section of the leading beam only by hoisting the integrated plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] Figure 1 It is a schematic structural diagram showing the tunnel, highway, first bridge section and leading beam in the background art of the present invention.

[0031] Figure 2 It is a schematic structural diagram showing the overall structure in the present invention.

[0032] Figure 3 It is a schematic structural diagram showing the anti-flexure plate in the present invention.

[0033] Figure 4 It is a schematic structural diagram showing the connection assembly in the present invention.

[0034] Figure 5 It is a schematic structural diagram showing the connection assembly of the present invention with the connecting member and the reinforcing plate removed.

[0035] Figure 6 It is a schematic structural diagram showing the connecting member in the present invention.

[0036] Figure 7 It is a schematic structural diagram showing the reinforcing plate, the first reinforcing rod and the second reinforcing rod in the present invention.

[0037] Figure 1 In it: 1. The first bridge section; 2. The tunnel; 3. The highway; 4. The leading beam.

[0038] Figures 2 - 7 In it: 5. The first bridge section; 51. The first steel beam section; 52. The rear steel beam section; 6. The leading beam; 61. The strengthening beam; 62. The I-beam; 621. The connecting plate; 7. The connection assembly; 71. The connecting frame; 72. The fixing plate; 721. The connection groove; 722. The clamping plate; 73. The rotating plate; 731. The top support block; 74. The limiting plate; 75. The integrated plate; 751. The limiting rod; 752. The anti-disengagement plate; 753. The pull rod; 76. The support block; 761. The steel wire rope; 762. The wheel set; 77. The reinforcing plate; 771. The first reinforcing rod; 772. The second reinforcing rod; 78. The anti-flexure plate; 19. The lifting ring. Detailed implementation manners

[0039] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0040] Refer to Figure 2 and Figure 3, A rapid installation and disassembly construction method for the segmented leading beam by the jacking method, including the first bridge section 5. The first bridge section 5 includes the first steel beam 51 and multiple subsequent steel beams 52. The multiple subsequent steel beams 52 are sequentially connected to the rear end of the first steel beam 51. One end of the first steel beam 51 away from the subsequent steel beams 52 is fixedly connected with a segmented leading beam. The segmented leading beam includes multiple sections of leading beams 6, and adjacent leading beams 6 are connected through a connection component 7. Each section of the leading beam 6 includes two I-beams 62 and a reinforcing beam 61 arranged between the I-beams 62, and the I-beams 62 are welded to the reinforcing beam 61.

[0041] Refer to Figure 4 and Figure 5 , The connection component 7 includes a connection frame 71. One end of the connection frame 71 in the second direction is located between the two I-beams 62 of one section of the leading beam 6, and the other end is located between the two I-beams 62 of another section of the leading beam 6. Both ends of the connection frame 71 in the first direction are fixedly connected with fixing plates 72, that is, there are two fixing plates 72. Each fixing plate 72 is in contact with the top surfaces of two adjacent I-beams 62 arranged in the second direction at the same time. A rotating plate 73 is hinged to the opposite end of each fixing plate 72, and the two rotating plates 73 are respectively in contact with the opposite ends of two adjacent I-beams 62 arranged in the first direction to limit the two I-beams 62 in the second direction. A limiting plate 74 is integrally formed on the bottom surface of each rotating plate 73, and each limiting plate 74 is in contact with the bottom surfaces of two adjacent I-beams 62 arranged in the second direction at the same time to realize the vertical limit of the I-beams 62. Connection plates 621 are welded to the top and bottom surfaces of each I-beam 62, and connection grooves 721 for inserting the connection plates 621 are provided on the fixing plates 72 and the limiting plates 74. Through the cooperation of the connection plates 621 and the connection grooves 721, the limit of the I-beams 62 in the first direction is realized. The above-mentioned scheme is combined to realize the relative fixation of two adjacent I-beams 62 arranged in the first direction, and further realize the fixation of adjacent leading beams 6.

[0042] Refer to Figures 4 to 6 , To facilitate the limitation of the limiting plate 74, a connecting member is also provided on the connection frame 71. The connecting member includes an integrated plate 75 and a limiting rod 751 welded to the bottom surface of the integrated plate 75. The integrated plate 75 is placed on the connection frame 71. Clamping plates 722 are also welded to the top and bottom surfaces of the connection frame 71. The limiting rod 751 sequentially passes through the clamping plates 722 and the limiting plate 74 from top to bottom to prevent the limiting plate 74 from rotating, so that the limiting plate 74 is fixed relative to the connection frame 71. There are multiple limiting rods 751 to improve the stability of the limitation of the limiting plate 74.

[0043] Refer to Figure 4 and Figure 5, support blocks 76 are provided at both opposite ends of the two I-beams 62. The support blocks 76 are located in the grooves on the sides of the I-beams 62, facilitating the provision of strong support for the connection between the two I-beams 62. A same steel wire rope 761 is fixedly connected between the two support blocks 76. A pull rod 753 is fixedly connected to the bottom surface of the integrated board 75. The steel wire rope 761 passes through the pull rod 753, so that when the integrated board 75 moves upward, it drives the steel wire rope 761 to move, and finally causes the support block 76 to disengage from the groove on the side wall of the I-beam 62 and retract into the connecting frame 71. To facilitate improving the stability of the movement of the steel wire rope 761, four wheel sets 762 are rotatably connected to the connecting frame 71, facilitating the restriction of the position of the steel wire rope 761, and at the same time facilitating the pull rod 753 to be able to pull the steel wire rope 761 to move, and then smoothly pull the support block 76.

[0044] Referring to Figure 5 and Figure 6 , an anti-disengagement plate 752 is welded to the side wall of the limiting rod 751. The anti-disengagement plate 752 and the clamping plate 722 overlap in the vertical projection. When the support block 76 disengages from the groove on the side wall of the I-beam 62 and the limiting rod 751 separates from the limiting plate 74, the anti-disengagement plate 752 abuts against the clamping plate 722, facilitating driving the connecting frame 71 to move upward together when the integrated board 75 moves upward.

[0045] A top support block 731 is welded to one end of the rotating plate 73 facing the I-beam 62. The top support block 731 abuts against the side wall of the I-beam 62 to further limit the I-beam 62 and can increase the overall strength of the I-beam 62.

[0046] Referring to Figure 5 and Figure 7 , a strengthening plate 77 is placed on the fixing plate 72. A first strengthening rod 771 and a second strengthening rod 772 are welded to the bottom surface of the strengthening plate 77. The first strengthening rod 771 passes through the fixing plate 72, the I-beam 62, the top support block 731 and the limiting plate 74, and the second strengthening rod 772 passes through the fixing plate 72, the I-beam 62, the support block 76 and the limiting plate 74. A plurality of first strengthening rods 771 and second strengthening rods 772 are provided to further improve the strength.

[0047] Referring to Figure 3 , an anti-flexure plate 78 is welded to one end of the leading beam 6 connected to the first-section steel beam 51 facing the first-section steel beam 51. One end of the anti-flexure plate 78 away from the leading beam 6 is inserted into the first-section steel beam 51, improving the strength at the connection between the leading beam 6 and the first-section steel beam 51 and reducing the possibility of fracture between the first-section steel beam 51 and the leading beam 6 due to downward deflection.

[0048] Lifting rings 19 are welded on both the reinforcement plate 77 and the integrated plate 75, facilitating lifting. At the same time, the connection structure of the connection component 7 in this solution does not use bolts and nuts as a whole, reducing potential safety hazards caused by loose bolts and nuts. And because bolts and nuts are not used, the installation efficiency can be significantly improved, achieving rapid installation.

[0049] A construction method for the segmented rapid installation and disassembly of the leading girder by the jacking method further includes the following steps:

[0050] S1. Install the jacking supports and jacking equipment along the jacking route, where the jacking route is the route that the first bridge section 5 needs to pass through when being jacked towards the second bridge section.

[0051] S2. Hoist the first steel girder 51 of the first bridge section 5 onto the jacking support, and fixedly connect the segmented leading girder to the end of the first steel girder 51 facing the tunnel. The connection can be by welding or by connecting with strong bolts.

[0052] S3. The jacking equipment starts to work, jack up the first steel girder 51 and push it towards the tunnel. The jacking equipment continues to work until one jacking is completed. One jacking does not mean just jacking once, but means that the jacking means the steel girder moves a certain distance. In this embodiment, this distance is the length of one rear steel girder 52. When jacking the first bridge section 5, the construction of the second bridge section in the tunnel is carried out synchronously, so that the second bridge section extends out of the tunnel. Piers are installed in advance under the part of the second bridge section extending out of the tunnel to support the second bridge section.

[0053] S4. After one jacking is completed, weld the rear steel girder 52 to the end of the first steel girder 51 of the first bridge section 5 away from the segmented leading girder, and then repeat step S3 until the segmented leading girder is close to the part of the second bridge section extending out of the tunnel. When the distance between the segmented leading girder and the second bridge section is sufficient to disassemble the segmented leading girder, it means that the segmented leading girder is close to the part of the second bridge section extending out of the tunnel.

[0054] S5. For the part of the second bridge section extending out of the tunnel, a crane is used to lift the leading beam 6 to be demolished, and then another crane or two cranes are used to disassemble the leading beam 6 section by section. During disassembly, first lift the reinforcement plate 77, pull out the reinforcement rod, and then hoist the integrated plate 75. When the integrated plate 75 is hoisted, the limit rod 751 first disengages from the limit plate 74, and then the pull rod 753 pulls the steel wire rope 761 upward, causing the support block 76 to disengage from the groove on the side wall of the I-beam 62. Subsequently, the anti-disengagement plate 752 abuts against the clamping plate 722, and the integrated plate 75 drives the entire connecting frame 71 to move upward. After the limit plate 74 separates from the limit rod 751, due to the center of gravity, it rotates downward, causing the limit plate 74 to be inclined relative to the bottom surface of the I-beam 62. As the connecting frame 71 moves upward, the limit plate 74 gradually abuts against the edge line of the bottom surface of the I-beam 62 and gradually continues to rotate under the influence of the I-beam 62. Thus, the limit plate 74 is gradually completely separated from the I-beam 62 during the upward movement, realizing the separation of the connecting component 7 from the I-beam 62. Finally, the rapid disassembly of one section of the leading beam 6 is achieved by only hoisting the integrated plate 75.

[0055] After each section of the leading beam 6 is demolished, the jacking equipment jacks the first bridge section 5 to move a distance equal to the length of one section of the leading beam 6 until all the leading beams 6 are demolished. The demolished leading beams 6 are transported through the second bridge section.

[0056] S6. After all the sectional leading beams are demolished, the jacking equipment continues to jack the first bridge section 5 so that the first bridge section 5 abuts against the second bridge section. After welding is completed between the first bridge section 5 and the second bridge section, the construction is completed.

[0057] Working principle: While jacking the first bridge section 5 for construction, the second bridge section is constructed so that a part of the second bridge section extends out of the tunnel. On the one hand, it can improve the overall construction efficiency and reduce the difficulty of docking between the first bridge section 5 and the second bridge section; on the other hand, a crane can be installed on the part of the second bridge section extending out of the tunnel, which is convenient for disassembling the sectional leading beam; on the third hand, the disassembled leading beam 6 can be directly transported away through the second bridge section; and the setting of the sectional leading beam, on the one hand, can reduce the difficulty of hoisting and conveying, and on the other hand, can reduce the space occupied during the disassembly of the leading beam 6, thus leaving space for the part of the second bridge section extending out, facilitating the synchronous construction of the first bridge section 5 and the second bridge section, and improving the overall construction efficiency.

[0058] Based on the above ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A construction method for rapid installation and disassembly of a segmented leading girder by the pushing method, characterized in that: It includes the following steps: S1. Install the jacking brackets along the jacking route and install the jacking equipment; S2. Hoist the first steel girder (51) of the first bridge section (5) onto the jacking brackets, and connect the segmented leading girder to one end of the first steel girder (51) facing the tunnel; S3. The jacking equipment works to lift and push the first steel girder (51) towards the tunnel. The jacking equipment continues to work until one jacking is completed. When jacking the first bridge section (5), construct the second bridge section in the tunnel so that the second bridge section extends out of the tunnel; S4. After one jacking is completed, weld the rear steel girder (52) to the end of the first steel girder (51) of the first bridge section (5) away from the segmented leading girder, and then repeat S3 until the segmented leading girder is close to the part of the second bridge section extending out of the tunnel; S5. Use a crane to lift the segmented leading girder at the part where the second bridge section extends out of the tunnel, and disassemble the segmented leading girder section by section. After each section of the leading girder (6) is removed, the jacking equipment jacks the first bridge section (5) to move a distance equal to the length of one section of the leading girder (6) until all the leading girders (6) are removed. The removed leading girders (6) are transported through the second bridge section; S6. After all the segmented leading girders are removed, the jacking equipment continues to jack the first bridge section (5) so that the first bridge section (5) abuts against the second bridge section, and weld between the first bridge section (5) and the second bridge section is completed, thus completing the construction.

2. The segmental rapid installation and disassembly construction method of the leading girder by the pushing method according to claim 1, characterized in that: The segmented leading girder includes multiple sections of leading girders (6), and adjacent leading girders (6) are connected through a connecting component (7); Each section of the leading girder (6) includes two I-beams (62) and a reinforcing beam (61) arranged between the I-beams (62), and the I-beams (62) are welded to the reinforcing beam (61).

3. The segmental rapid installation and disassembly construction method of the leading girder by the pushing method according to claim 2, characterized in that: The connecting component (7) includes a connecting frame (71), one end of the connecting frame (71) in the second direction is located between the two I-beams (62) of one section of the leading girder (6), and the other end is located between the two I-beams (62) of another section of the leading girder (6); fixing plates (72), the fixing plates (72) are fixedly connected to the connecting frame (71), and there are two fixing plates (72) arranged oppositely in the first direction. Each fixing plate (72) abuts against the top surfaces of two adjacent I-beams (62) in the second direction at the same time; rotating plates (73), there are two rotating plates (73). Each rotating plate (73) is hinged to one of the fixing plates (72), and the two rotating plates (73) abut against the opposite ends of two adjacent I-beams (62) in the first direction respectively; limiting plates (74), there are two limiting plates (74). Each limiting plate (74) is fixedly connected to one of the rotating plates (73), and each limiting plate (74) abuts against the bottom surfaces of two adjacent I-beams (62) in the second direction at the same time; a connecting piece, the connecting piece is arranged on the connecting frame (71) and connects the limiting plate (74) to the connecting frame (71); The connecting frame (71), the fixed plate (72), the rotating plate (73) and the limiting plate (74) simultaneously cover a part of two adjacent I-beams (62) arranged in the second direction to realize the connection between two adjacent sections of the leading beam (6). Connecting plates (621) are provided on the top and bottom surfaces of each I-beam (62), and connection grooves (721) for inserting the connecting plates (621) are provided on the fixed plate (72) and the limiting plate (74).

4. The segmental rapid installation and disassembly construction method of the leading beam by the pushing method according to claim 3, characterized in that: The connecting member includes an integrated plate (75) and a limiting rod (751) connected to the bottom surface of the integrated plate (75). The integrated plate (75) is placed on the connecting frame (71), and the limiting rod (751) sequentially passes through the connecting frame (71) and the limiting plate (74) from top to bottom, so that the limiting plate (74) is fixed relative to the connecting frame (71).

5. The construction method for rapid installation and disassembly of the leading girder in sections by the pushing method according to claim 4, characterized in that: Support blocks (76) are provided at the opposite ends of the two I-beams (62), and the support blocks (76) are located in the grooves on the side surfaces of the I-beams (62).

6. The construction method for rapid installation and disassembly of the leading girder in segments by the pushing method according to claim 5, characterized in that: A steel wire rope (761) is connected between the two support blocks (76), and a pull rod is connected to the bottom surface of the integrated plate (75). The steel wire rope (761) passes through the pull rod, so that when the integrated plate (75) moves upward, it drives the steel wire rope (761) to move, and finally makes the support block (76) disengage from the groove on the side wall of the I-beam (62).

7. The segmental rapid installation and removal construction method of the leading girder by the pushing method according to claim 6, characterized in that: An anti-disengagement plate (752) is connected to the side wall of the limiting rod (751), and a clamping plate (722) for abutting against the anti-disengagement plate (752) is connected to the top of the connecting frame (71). After the support block (76) disengages from the groove on the side wall of the I-beam (62) and the limiting rod (751) separates from the limiting plate (74), the anti-disengagement plate (752) abuts against the clamping plate (722).

8. The construction method for rapid installation and disassembly of the leading girder in sections by the pushing method according to claim 5, characterized in that: One end of the rotating plate (73) facing the I-beam (62) is connected with a top support block (731), and the top support block (731) abuts against the side wall of the I-beam (62).

9. The construction method for rapid installation and disassembly of the leading girder in segments by the pushing method according to claim 5, characterized in that: A strengthening plate (77) is placed on the fixed plate (72). A first strengthening rod (771) and a second strengthening rod (772) are connected to the bottom surface of the strengthening plate (77). The first strengthening rod (771) passes through the fixed plate (72), the I-beam (62), the top support block (731) and the limiting plate (74), and the second strengthening rod (772) passes through the fixed plate (72), the I-beam (62), the support block (76) and the limiting plate (74).

10. The segmental rapid installation and demolition construction method of the leading beam by the pushing method according to claim 2, characterized in that: One end of the leading beam (6) connected to the first section of steel beam (51) facing the first section of steel beam (51) is connected with an anti-flexure plate (78), and one end of the anti-flexure plate (78) away from the leading beam (6) is inserted into the first section of steel beam (51).

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