Method for installing ultrahigh special-shaped portal crane crossing viaduct

Abstract

The invention discloses a method for installing an ultrahigh special-shaped portal crane crossing a viaduct. The method comprises the following steps: preparing a site; components of the ultrahigh special-shaped portal crane enter the site and are unloaded to the two sides of the viaduct; hoisting a main beam segmental beam of the ultrahigh special-shaped portal crane; assembling a main beam of the ultrahigh special-shaped portal crane; mounting a landing leg ground beam of the ultrahigh special-shaped portal crane; hoisting a main beam structure of the ultrahigh special-shaped portal crane; hoisting by a trolley of the ultrahigh special-shaped portal crane; and other systems of the ultrahigh special-shaped portal crane are installed. The invention relates to the technical field of bridge construction, and can solve the problems of high safety risk and low installation efficiency during installation of an ultrahigh special-shaped portal crane crossing a viaduct in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a method for installing an ultra-high special-shaped gantry crane across a viaduct. Background Art

[0002] Gantry cranes are typically installed using a single truck crane or two truck cranes. However, when a gantry crane needs to span an elevated highway, due to the elevated height of the highway, an ultra-high, special-shaped gantry crane is required. This approach is inappropriate, presents significant safety risks, and is inefficient. Therefore, a method for installing an ultra-high, special-shaped gantry crane spanning an elevated highway is needed to address the existing safety risks and inefficiency associated with the installation of ultra-high, special-shaped gantry cranes spanning elevated highways. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for installing an ultra-high special-shaped gantry crane across an elevated bridge, which can solve the problems of high safety risks and low installation efficiency in the prior art when installing an ultra-high special-shaped gantry crane across an elevated bridge.

[0004] The present invention is achieved in that:

[0005] A method for installing an ultra-high special-shaped gantry crane across a viaduct comprises the following steps:

[0006] Step 1: Site preparation;

[0007] Step 2: The components of the super-high special-shaped gantry crane are brought into the site and unloaded to both sides of the viaduct;

[0008] Step 3: Hoisting of main beam segments of super-high special-shaped gantry crane;

[0009] Step 4: Assembling the main beam of the super-high special-shaped gantry crane;

[0010] Step 5: Installation of outrigger ground beams for super-high special-shaped gantry cranes;

[0011] Step 6: Hoisting of the main beam structure of the super-high special-shaped gantry crane;

[0012] Step 7: Hoisting of the trolley of the super-high special-shaped gantry crane;

[0013] Step 8: Installation of other systems of super high special-shaped gantry crane.

[0014] Described step 1 comprises the following sub-steps:

[0015] Step 1.1: According to the on-site construction preparation and the parameters of the super-high special-shaped gantry crane, make the running rails of the super-high special-shaped gantry crane;

[0016] Step 1.2: Clear the lifting area before lifting operations;

[0017] Step 1.3: Three truck cranes and one aerial work vehicle enter the site. The three truck cranes include two side truck cranes located at one end of a pair of running rails and one mid-position truck crane located between the piers on both sides of the viaduct. The aerial work vehicle is located between the piers on both sides of the viaduct.

[0018] In the above step 1.1, a pair of running rails are symmetrically arranged on both sides of the viaduct, and the length direction of the running rails is parallel to the axial direction of the viaduct.

[0019] The components of the super-high special-shaped gantry crane include a first end segment beam, a second end segment beam, an intermediate segment beam, a connecting beam, a leg ground beam and a trolley.

[0020] Described step 3 comprises the following sub-steps:

[0021] Step 3.1: Use two side-mounted truck cranes to lift a first end segment beam and a second end segment beam to a position above the viaduct;

[0022] Step 3.2: Two side-mounted truck cranes swing their arms to move a first-end segment beam and a second-end segment beam to the lifting center position respectively;

[0023] Step 3.3: Connect a traction rope to a first end segment beam and a second end segment beam, respectively, and manually pull the traction rope to rotate the first end segment beam and the second end segment beam until the length direction of the first end segment beam and the second end segment beam are perpendicular to the length direction of the viaduct, and a gap is left between the first end segment beam and the second end segment beam;

[0024] Step 3.4: Lower the first end segment beam and the second end segment beam to the piers on both sides of the viaduct respectively, without removing the hooks of the two side truck cranes on the first end segment beam and the second end segment beam;

[0025] Step 3.5: Start the mid-position truck crane and lift a section of the middle segment beam to the gap between the first end segment beam and the second end segment beam.

[0026] The width of the gap between the first end segment beam and the second end segment beam is consistent with the length of the middle segment beam.

[0027] In step 4, an operator is carried to both ends of the middle segment beam by an aerial work vehicle, and the middle segment beam is connected to the first end segment beam and the second end segment beam into a whole to form a main beam;

[0028] Repeat steps 3 and 4 to complete the hoisting and assembly of the other main beam. The two main beams are placed in parallel and spaced apart on the piers on both sides of the viaduct.

[0029] Described step 5 comprises the following sub-steps:

[0030] Step 5.1: Two side-mounted truck cranes slowly and synchronously lift the hooks and lift the two outrigger ground beams to a vertical position;

[0031] Step 5.2: Stop lifting after the lower end of the outrigger ground beam leaves the ground. Check whether the two side truck cranes and the outrigger ground beam are normal. If they are normal, proceed to step 5.3. If there are any abnormalities, adjust the lifting plan to ensure that the two side truck cranes and the outrigger ground beam are normal.

[0032] Step 5.3: The construction workers rotated the two outrigger ground beams to the installation angle, and two side-mounted truck cranes continued to lift the two outrigger ground beams;

[0033] Step 5.4: Use two side-mounted truck cranes to place the two outrigger beams on a pair of running rails, and use a total station to observe the verticality of the two outrigger beams to ensure that both outrigger beams are in a vertical state;

[0034] Step 5.5: Temporarily fix the two supporting leg beams.

[0035] Described step 6 comprises the following sub-steps:

[0036] Step 6.1: Use two side truck cranes to lift the main beam as a whole to the bridge deck of the viaduct and hover it above the bridge. Check whether the two side truck cranes and the main beam are normal. If they are normal, proceed to Step 6.2. If there are any abnormalities, adjust the lifting plan to ensure that the two side truck cranes and the main beam are normal.

[0037] Step 6.2: Two side-mounted truck cranes simultaneously lift the main beam to the top of the two outrigger ground beams and initially secure it;

[0038] Step 6.3: The aerial work vehicle carries the construction workers to the top of the outrigger ground beam and welds the main beam to the top of the two outrigger ground beams;

[0039] Step 6.4: Connect the two sides of the two main beams through two connecting beams to form an overall main beam structure, so that the main beam structure and the two supporting leg beams form a portal structure.

[0040] In the step 7, the trolley is hoisted onto the main beam structure by a side truck crane, and the two main beam sections serve as the running tracks of the trolley.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention adopts three truck cranes to respectively lift the first end segment beam, the second end segment beam and the middle segment beam to the top of the viaduct, and workers on board an aerial work vehicle assemble them to form the main beam. Under the premise of ensuring safety, the main beam installation of the gantry crane on the viaduct is realized; at the same time, two truck cranes are used to lift the support leg ground beams on both sides of the viaduct to support and connect the main beams, forming a gantry structure that can slide freely on the running rails, and finally one truck crane is used to lift the trolley; through the coordinated lifting of the three truck cranes, the efficient and safe installation of the super-high special-shaped gantry crane across the viaduct is realized.

[0043] 2. The present invention can adaptably select three models of truck cranes according to the specifications of different types of super-high and special-shaped gantry cranes. It can be implemented for the installation method of super-high and special-shaped gantry cranes or other equipment and facilities across the viaduct, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a flow chart of a method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0045] Figure 2 1 is a schematic diagram of step 1 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention;

[0046] Figure 3 2 is a schematic diagram of step 2 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0047] Figure 4 It is a schematic plan view of step 3 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0048] Figure 5 is a cross-sectional schematic diagram of step 3 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention;

[0049] Figure 6 4 is a schematic plan view of step 4 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0050] Figure 7 is a cross-sectional schematic diagram of step 4 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention;

[0051] Figure 8 It is a schematic plan view of step 5 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0052] Figure 9 is a cross-sectional schematic diagram of step 5 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention;

[0053] Figure 10 It is a schematic plan view of step 6 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0054] Figure 11 is a cross-sectional schematic diagram of step 6 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention;

[0055] Figure 12 2. It is a schematic plan view of step 7 in the method for installing a super-high special-shaped gantry crane across a viaduct according to the present invention;

[0056] Figure 13 It is a cross-sectional schematic diagram of step 7 in the method for installing an ultra-high special-shaped gantry crane across a viaduct according to the present invention.

[0057] In the figure, 1 is a running track, 2 is an elevated bridge, 31 is a side truck crane, 32 is a mid-position truck crane, 4 is an aerial work vehicle, 5 is a main beam, 51 is a first end segment beam, 52 is a second end segment beam, 53 is an intermediate segment beam, 54 is a connecting beam, 55 is a support leg ground beam, and 56 is a trolley. DETAILED DESCRIPTION

[0058] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0059] Please see the attached Figure 1 A method for installing an ultra-high special-shaped gantry crane across a viaduct comprises the following steps:

[0060] Please see the attached Figure 2 , Step 1: Site preparation.

[0061] Described step 1 comprises the following sub-steps:

[0062] Step 1.1: According to the on-site construction preparation and the parameters of the super-high special-shaped gantry crane, make the running rail 1 of the super-high special-shaped gantry crane.

[0063] In the step 1.1, a pair of running rails 1 are symmetrically arranged on both sides of the viaduct 2. The length direction of the running rails 1 is parallel to the axial direction of the viaduct 2, so that the portal structure can move along the axial direction of the viaduct 2, which facilitates the construction of the viaduct 2.

[0064] Step 1.2: Clear the lifting area before lifting operations to ensure that there is no risk of collision within the swing arm range of the truck crane.

[0065] Step 1.3: Three truck cranes and one aerial work vehicle 4 enter the site. The three truck cranes include two side truck cranes 31 located at one end of a pair of running rails 1 and one mid-position truck crane 32 located between the piers on both sides of the viaduct 2. The aerial work vehicle 4 is located between the piers on both sides of the viaduct 2.

[0066] Preferably, the mid-position truck crane 32 and the aerial work vehicle 4 are both located on the central axis of the viaduct 2, and the mid-position truck crane 32 and the aerial work vehicle 4 are respectively located on both sides of the main beam of the super-high special-shaped gantry crane.

[0067] The three truck cranes should be selected according to the weight of the components of the super-high special-shaped gantry crane. The three truck cranes work together to lift the components of the super-high special-shaped gantry crane.

[0068] Please see the attached Figure 3 , Step 2: The components of the super-high special-shaped gantry crane enter the site and are unloaded to both sides of viaduct 2.

[0069] The components of the ultra-high special-shaped gantry crane include a first end segment beam 51, a second end segment beam 52, an intermediate segment beam 53, a connecting beam 54, a leg ground beam 55, and a trolley 56. The type and quantity of components of the ultra-high special-shaped gantry crane can be adaptively selected according to the requirements of the ultra-high special-shaped gantry crane required for construction.

[0070] The components of the ultra-high, special-shaped gantry crane can be unloaded onto both sides of the viaduct 2 according to actual construction requirements to facilitate lifting operations. Preferably, the two first-end segmental beams 51, two second-end segmental beams 52, a connecting beam 54, a support leg 55, and a trolley 56 can be unloaded onto one side of the viaduct 2, and the two intermediate segmental beams 53, a connecting beam 54, and a support leg 55 can be unloaded onto the other side of the viaduct 2.

[0071] Please see the attached Figure 4 and attached Figure 5 , Step 3: Hoisting of the main beam segment beam of the super-high special-shaped gantry crane.

[0072] Described step 3 comprises the following sub-steps:

[0073] Step 3.1: Use two side-mounted truck cranes 31 to lift a first end segment beam 51 and a second end segment beam 52 to a position above the viaduct 2 .

[0074] Preferably, two side-positioned truck cranes 31 lift a section of the first end segment beam 51 and a section of the second end segment beam 52 to 1m above the bridge deck of the viaduct 2, so as to facilitate the subsequent safe movement and rotation of the first end segment beam 51 and the second end segment beam 52 without collision or interference with the components on the viaduct 2.

[0075] Step 3.2: Two side-mounted truck cranes 31 swing their arms to move a section of the first end segment beam 51 and a section of the second end segment beam 52 to the lifting center position respectively.

[0076] Preferably, the hoisting center position can be determined based on actual construction conditions. The center of the first end segment beam 51 can be positioned on an extension of the central axis of the pier on one side of the viaduct 2. This position is the hoisting center position. The first end segment beam 51 and the second end segment beam 52 on both sides are symmetrically arranged and each is moved to its corresponding hoisting center position. The movement process of the second end segment beam 52 on the other side is not further described here. The hoisting center position can also be adaptively adjusted based on the actual hoisting operation requirements.

[0077] Step 3.3: Connect a traction rope to a section of the first end segment beam 51 and a section of the second end segment beam 52, and manually pull the traction rope to rotate the first end segment beam 51 and the second end segment beam 52 clockwise around the lifting arm of the side truck crane 31 with their side truck cranes 31 as reference points until the length directions of the first end segment beam 51 and the second end segment beam 52 are perpendicular to the length direction of the viaduct 2, and a gap is left between the first end segment beam 51 and the second end segment beam 52.

[0078] The width of the gap between the first end segment beam 51 and the second end segment beam 52 is consistent with the length of the middle segment beam 53 .

[0079] Preferably, the installation of the traction rope on the first end segment beam 51 and the second end segment beam 52 can be completed on the ground, and the pulling of the traction rope can be carried out on the ground, or the construction workers can be carried to a suitable height position by the aerial work vehicle 4 to perform the pulling operation, so as to rotate the first end segment beam 51 and the second end segment beam 52 to a suitable installation direction.

[0080] Step 3.4: The first end segment beam 51 and the second end segment beam 52 are lowered to the piers on both sides of the viaduct 2 respectively, without removing the hooks of the two side truck cranes 31 and the first end segment beam 51 and the second end segment beam 52 to ensure the safety of the first end segment beam 51 and the second end segment beam 52 and prevent them from falling.

[0081] Step 3.5: Start the mid-position truck crane 32 and hoist a section of the middle segment beam 53 to the gap between the first end segment beam 51 and the second end segment beam 52 .

[0082] Please see the attached Figure 6 and attached Figure 7 , Step 4: Assemble the main beam 5 of the super-high special-shaped gantry crane.

[0083] In step 4 , an operator is carried to both ends of the middle segment beam 53 by an aerial work vehicle 4 , and the middle segment beam 53 is connected to the first end segment beam 51 and the second end segment beam 52 into a whole to form a main beam 5 .

[0084] At this time, the hooks of the two side truck cranes 31 connecting the first end segment beam 51 and the second end segment beam 52 can be removed, and the weight of the main beam 5 is borne by the piers on both sides of the viaduct 2.

[0085] Repeat steps 3 and 4 to complete the hoisting and assembly of another section of the main beam 5. The two sections of the main beam 5 are placed in parallel and at intervals on the piers on both sides of the viaduct 2.

[0086] After the hoisting and assembly of the main beam 5 are completed, the mid-position truck crane 32 can be removed from the site.

[0087] Please see the attached Figure 8 and attached Figure 9 , Step 5: Installation of the outrigger ground beam 55 of the super-high special-shaped gantry crane.

[0088] Described step 5 comprises the following sub-steps:

[0089] Step 5.1: Two side-mounted truck cranes 31 slowly and synchronously lift the hooks and lift the two outrigger ground beams 55 to a vertical state respectively.

[0090] Step 5.2: Stop lifting after the lower end of the outrigger ground beam 55 leaves the ground, and check whether the two side truck cranes 31 and the outrigger ground beam 55 are normal. If they are normal, proceed to step 5.3. If there are any abnormalities, adjust the lifting plan to ensure that the two side truck cranes 31 and the outrigger ground beam 55 are normal.

[0091] Preferably, when the lower end of the outrigger ground beam 55 is about 1 meter away from the ground, the side truck crane 31 stops lifting, which is convenient for inspection of the outrigger ground beam 55 and the two side truck cranes 31, and also convenient for subsequent continued lifting of the outrigger ground beam 55 without collision with ground components such as the running rail 1.

[0092] The inspection items for checking whether the two side truck cranes 31 and the outrigger ground beams 55 are normal mainly include: whether the load, swing arm and other movements of the side truck cranes 31 are normal, whether the structure of the outrigger ground beams 55 is firm (the outrigger ground beams 55 are composed of outriggers and ground beams connected), etc. Abnormal inspections can be carried out according to actual construction conditions to ensure that the subsequent installation of the outrigger ground beams 55 is normal and safe.

[0093] Step 5.3: The construction workers rotate the two outrigger ground beams 55 to the installation angle respectively, and the two side-positioned truck cranes 31 continue to lift the two outrigger ground beams 55.

[0094] The installation angles of the two support leg ground beams 55 can be determined according to the gantry structure design of the super-high special-shaped gantry crane. Preferably, the planes where the two support leg ground beams 55 are located are perpendicular to each other, which can provide safe and effective support for the main beam 5, thereby ensuring the structural stability, safety and bearing capacity of the gantry structure.

[0095] Step 5.4: Two side-positioned truck cranes 31 place the two outrigger ground beams 55 on a pair of running rails 1 respectively, and observe the verticality of the two outrigger ground beams 55 through a total station to ensure that both outrigger ground beams 55 are in a vertical state to ensure the vertical force transmission of the gantry structure under load and the operational safety of the super-high special-shaped gantry crane.

[0096] Step 5.5: Temporarily fix the two supporting leg beams 55.

[0097] Please see the attached Figure 10 and attached Figure 11 , Step 6: Hoisting the main beam structure of the super-high special-shaped gantry crane.

[0098] Described step 6 comprises the following sub-steps:

[0099] Step 6.1: Two side truck cranes 31 lift simultaneously, hoisting the main beam 5 as a whole to the bridge deck of the viaduct 2 and hovering it. Check whether the two side truck cranes 31 and the main beam 5 are normal. If they are normal, execute step 6.2. If there are any abnormalities, adjust the lifting plan to ensure that the two side truck cranes 31 and the main beam 5 are normal.

[0100] Preferably, the two side truck cranes 31 and the main beam 5 can be observed for 10 minutes to check whether they are normal. The inspection items mainly include: whether the load, swing arm and other movements of the side truck crane 31 are normal, whether the structure of the main beam 5 is firm, whether there is deflection, etc. Abnormal inspection can be carried out according to the actual construction conditions to ensure that the subsequent installation of the main beam 5 is normal and safe.

[0101] Step 6.2: Two side-mounted truck cranes 31 lift simultaneously, hoisting the main beam 5 as a whole to the top of the two outrigger ground beams 55 and preliminarily fixing them.

[0102] Step 6.3: The aerial work vehicle 4 carries the construction workers to the top of the outrigger ground beam 55 and uses an electric welder or other equipment to weld and fix the main beam 5 to the flange plates on the top of the two outrigger ground beams 55 .

[0103] The two sections of main beams 5 are hoisted to the top of the two supporting leg beams 55 in the same way, and the hoisting process of the other section of main beam 5 is not repeated here.

[0104] Step 6.4: Connect the two sides of the two main beams 5 through two connecting beams 54 to form an overall main beam structure, so that the main beam structure and the two supporting leg beams 55 form a portal structure.

[0105] When lifting the main beam 5, two side truck cranes 31 must simultaneously lift the main beam 5, maintaining coordinated movements. Gradually lift the main beam 5 to the desired height and position. During the lifting process, closely monitor the condition of the main beam 5 and the load of the side truck cranes 31 to ensure safety.

[0106] According to the installation drawings and requirements, gradually complete the connection and fixing of the main beam structure to the outrigger ground beam 55. During the installation process, ensure that all connecting parts are secure and reliable, without any looseness or damage. The connection between the main beam structure and the outrigger ground beam 55 is manually performed. Construction personnel use an aerial work platform 4 to reach the top of the outrigger ground beam 55 to perform the work.

[0107] Please see the attached Figure 12 and attached Figure 13 , Step 7: Hoisting of trolley 56 of super high special-shaped gantry crane.

[0108] Specifically, in step 7, the trolley 56 is hoisted onto the main beam structure by a side truck crane 31 , and the two sections of the main beam 5 serve as the running track of the trolley 56 .

[0109] Step 8: Installation of other systems of super high special-shaped gantry crane.

[0110] Other systems include the electrical box, ladder and other accessories of the super-high special-shaped gantry crane. The number and type of accessories of the super-high special-shaped gantry crane can be adaptively adjusted according to actual usage requirements. The installation of the trolley 56 and accessories on the main beam 5 is a conventional operation in this field and will not be repeated here.

[0111] A pair of running rails 1, a gantry structure moving along the pair of running rails 1, and a trolley moving on the main beam structure form an ultra-high special-shaped gantry crane, which can be used to lift components of the viaduct 2 during the construction of the viaduct 2. The method of using the ultra-high special-shaped gantry crane is the same as that of a traditional gantry crane, which will not be repeated here.

[0112] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for installing an ultra-high special-shaped gantry crane across a viaduct, characterized by: The following steps are involved: Step 1: Site preparation; Step 2: The components of the super-high special-shaped gantry crane are brought into the site and unloaded onto both sides of the viaduct (2); Step 3: Hoisting of main beam segments of super-high special-shaped gantry crane; Step 4: Assembling the main beam (5) of the super-high special-shaped gantry crane; Step 5: Installing the outrigger ground beam (55) of the super-high special-shaped gantry crane; Step 6: Hoisting of the main beam structure of the super-high special-shaped gantry crane; Step 7: Hoisting of the trolley (56) of the super-high special-shaped gantry crane; Step 8: Installation of other systems of super high special-shaped gantry crane.

2. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: Described step 1 comprises the following sub-steps: Step 1.1: According to the on-site construction preparation and the parameters of the super-high special-shaped gantry crane, make the running rails of the super-high special-shaped gantry crane (1); Step 1.2: Clear the lifting area before lifting operations; Step 1.3: Three truck cranes and one aerial work vehicle (4) enter the site, wherein the three truck cranes include two side truck cranes (31) located at one end of a pair of running rails (1) and one center truck crane (32) located between the piers on both sides of the viaduct (2), and the aerial work vehicle (4) is located between the piers on both sides of the viaduct (2).

3. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 2 is characterized by: In the step 1.1, a pair of running rails (1) are symmetrically arranged on both sides of the viaduct (2), and the length direction of the running rails (1) is parallel to the axial direction of the viaduct (2).

4. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: The components of the super-high special-shaped gantry crane include a first end segment beam (51), a second end segment beam (52), an intermediate segment beam (53), a connecting beam (54), a leg ground beam (55) and a trolley (56).

5. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: Described step 3 comprises the following sub-steps: Step 3.1: Using two side-mounted truck cranes (31), hoist a first end segment beam (51) and a second end segment beam (52) to a position above the viaduct (2); Step 3.2: Two side-mounted truck cranes (31) swing their arms to move a first end segment beam (51) and a second end segment beam (52) to the center of the hoisting position respectively; Step 3.3: connecting a traction rope to a first end segment beam (51) and a second end segment beam (52), respectively, and manually pulling the traction rope to rotate the first end segment beam (51) and the second end segment beam (52) until the length direction of the first end segment beam (51) and the second end segment beam (52) are perpendicular to the length direction of the viaduct (2), and a gap is left between the first end segment beam (51) and the second end segment beam (52); Step 3.4: The first end segment beam (51) and the second end segment beam (52) are lowered to the piers on both sides of the viaduct (2) respectively, without removing the hooks of the two side truck cranes (31) and the first end segment beam (51) and the second end segment beam (52); Step 3.5: Start the mid-position truck crane (32) and hoist a section of the middle segment beam (53) to the gap between the first end segment beam (51) and the second end segment beam (52).

6. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 5 is characterized by: The width of the gap between the first end segment beam (51) and the second end segment beam (52) is consistent with the length of the middle segment beam (53).

7. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: In step 4, an operator is carried to both ends of the middle segment beam (53) by an aerial work vehicle (4), and the middle segment beam (53) is connected to the first end segment beam (51) and the second end segment beam (52) to form a whole, thereby forming a main beam (5); Repeat steps 3 and 4 to complete the hoisting and assembly of another section of the main beam (5), and the two sections of the main beam (5) are placed in parallel and spaced apart on the piers on both sides of the viaduct (2).

8. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: Described step 5 comprises the following sub-steps: Step 5.1: Two side-mounted truck cranes (31) slowly and synchronously lift the hooks and lift the two outrigger ground beams (55) to a vertical state respectively; Step 5.2: After the lower end of the outrigger ground beam (55) leaves the ground, stop lifting and check whether the two side truck cranes (31) and the outrigger ground beam (55) are normal. If normal, proceed to step 5.

3. If abnormal, adjust the lifting plan to ensure that the two side truck cranes (31) and the outrigger ground beam (55) are normal. Step 5.3: The construction workers rotate the two outrigger ground beams (55) to the installation angle respectively, and the two side truck cranes (31) continue to lift the two outrigger ground beams (55); Step 5.4: Two side-mounted truck cranes (31) place the two outrigger ground beams (55) on a pair of running rails (1) respectively, and observe the verticality of the two outrigger ground beams (55) using a total station to ensure that the two outrigger ground beams (55) are in a vertical state; Step 5.5: Temporarily fix the two supporting leg beams (55).

9. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1 is characterized by: Described step 6 comprises the following sub-steps: Step 6.1: Two side truck cranes (31) simultaneously lift and hoist the main beam (5) as a whole to the bridge deck of the viaduct (2) and suspend it, and check whether the two side truck cranes (31) and the main beam (5) are normal. If they are normal, perform step 6.

2. If there is any abnormality, adjust the lifting plan to ensure that the two side truck cranes (31) and the main beam (5) are normal. Step 6.2: Two side-mounted truck cranes (31) simultaneously lift the main beam (5) to the top of the two outrigger ground beams (55) and initially secure it; Step 6.3: The aerial work vehicle (4) carries the construction workers to the top of the outrigger ground beam (55), and welds and fixes the main beam (5) and the tops of the two outrigger ground beams (55); Step 6.4: Connect the two sides of the two main beams (5) through two connecting beams (54) to form an integral main beam structure, so that the main beam structure and the two supporting leg beams (55) form a portal structure.

10. The method for installing a super-high special-shaped gantry crane across a viaduct according to claim 1, characterized in that: In the step 7, the trolley (56) is hoisted onto the main beam structure by a side truck crane (31), and the two sections of the main beam (5) serve as the running track of the trolley (56).

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