A semicircular beam track crane assembly method

Abstract

The present invention discloses a method for assembling a semicircular beam rail crane, which relates to the technical field of rail crane assembly. The steps are: track layout; arranging the trolley running mechanism; hoisting the rigid leg side door frame and the flexible leg side door frame; hoisting the beam assembly; hoisting the diagonal brace; hoisting the electrical room and the high-voltage room; hoisting the trolley assembly; installing the cable reel; jacking and installing the accessories; and debugging the entire machine. The advantages of the present invention are: before hoisting the rigid leg side door frame and the flexible leg side door frame, the upper opening size is re-measured, and after positioning, the trolley running mechanism is positioned and connected to the rigid leg side door frame, the beam arch is re-measured before hoisting the beam assembly, and the beam assembly is hoisted into place in a stable state. The positioning is accurate during installation, and the installation accuracy is guaranteed. The various components are installed step by step according to the appropriate installation sequence, and the balance stability is good during hoisting and installation, which reduces safety risks. When hoisting the trolley assembly, the placement position is accurate, which improves the assembly efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of rail crane assembly, and in particular to an assembly method for a semicircular beam rail crane. Background Art

[0002] Rail-mounted cranes, also known as rail-mounted cranes, are primarily used for loading and unloading containers at storage yards. They often operate on rails at coastal terminals. Existing conventional rail-mounted cranes utilize a double rectangular box-shaped main beam design, which has a relatively high wind coefficient. To ensure structural safety in storm conditions, this often requires additional girder thickness or cross-sectional height. Semicircular girders, on the other hand, have a lower wind coefficient and are lighter than conventional rectangular girders, reducing both the main beam's wind coefficient and the weight of the superstructure.

[0003] The track gauge of rail crane trolleys is generally large, about 40m, and the total weight is also heavy. In order to ensure the rigidity of the structure, a double-sided rigid door frame and a single-sided door frame lateral support design are adopted. In order to avoid the phenomenon of gnawing the rails during the operation of the rail crane, a combination of rigid leg door frame and flexible leg door frame is adopted. In the prior art, there is no public assembly method for semi-circular beam rail cranes. When conventional rail cranes are assembled, the upper opening size of the door frame, the arch of the beam, etc. are not re-measured before hoisting. The positioning is inaccurate during installation, and the installation accuracy cannot be guaranteed. In addition, the installation order of each component is relatively arbitrary, which affects the balance stability during hoisting and installation, and there is a safety risk. The trolley assembly is directly hoisted onto the track. If the placement position is inaccurate, it needs to be readjusted, which is troublesome to adjust and affects the assembly efficiency. The present invention provides an assembly method for a semi-circular beam rail crane. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a semicircular beam track crane assembly method.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] S1. Track layout: Clean the site, select a location with relatively hard geology in the assembly area near the gantry crane, lay two rows of track beams and steel plates, mark the tracks after cleaning, and measure and adjust the tracks;

[0007] S2. Arrange the trolley travel mechanism: hoist the trolley travel mechanism onto the arranged track, use the jacking tool to support the travel to prevent tipping, install the trolley connecting bracket and the trolley travel mechanism in place, ensure that the center line of the trolley connecting bracket and the trolley travel mechanism coincides, after jacking up to a level, pad the wheels and the track with pads, and after re-testing and passing, use the trolley gear to position the travel wheels to prevent sliding. This jacking state serves as the basis for subsequent data measurement;

[0008] S3. Hoist the door frame on the rigid leg side and the flexible leg side: Before hoisting the door frame, remeasure the upper opening size. First, hoist the door frame on the rigid leg side to the trolley travel position. Use the center locating ring of the lower crossbeam and the locating hole of the connecting bracket to position it. Position the trolley travel mechanism and the rigid leg side door frame. Hoist the entire frame onto the assembly track. Use the wind ropes on both sides to adjust the verticality of the door frame. Then hoist and install the flexible leg side door frame. The installation steps are the same as those for the rigid leg side door frame.

[0009] S4. Hoisting the beam assembly: Before hoisting the beam assembly, trim the margins at the lower ends of the upper crossbeams on the rigid and flexible leg sides according to the flatness and overall height of the flanges on the door frame legs. Re-measure the beam arch before hoisting the beam assembly. Before hoisting, do not install the buffer and fixing bracket at the flexible leg side beam end. Install them after the trolley frame is hoisted into place. The two gantry cranes operate synchronously to stabilize the beam assembly for hoisting into place. Weld the lower crossbeams on the rigid and flexible leg sides to the large seams between the rigid and flexible legs respectively. Confirm the reinforcement on all four sides before welding, and weld symmetrically.

[0010] S5. Hoisting the diagonal brace: When hoisting, after the diagonal brace is close to the door frame component, gradually adjust the upper flange plate of the diagonal brace to fit closely with the lower end of the end beam of the beam. Simultaneously, gradually trim the allowance of the lower end of the diagonal brace. After adjusting the trimming allowance, install the diagonal brace in place. After the diagonal brace is firmly spot-welded to the end beam of the beam and the rigid leg, loosen the hook. Then, install the process platform at the large joint between the rigid leg and the diagonal brace. Finally, weld the large joint between the diagonal brace and the end beam of the beam and the diagonal brace and the rigid leg. Before welding, confirm the reinforcement on all four sides, weld symmetrically, and remove the wind ropes on the process platform and the flexible leg side door frame.

[0011] S6. Hoisting the electrical room and high-voltage room: Re-measure the openings and angles of the high-voltage room brackets and the electrical room brackets, and re-check the openings and angles of the corresponding connecting plates of the high-voltage room base frame and the electrical room base frame. Hoist the high-voltage room and the electrical room. After hoisting into place, connect the base frame and bracket bolts and then release the hooks;

[0012] S7. Hoisting the trolley assembly: After hoisting the trolley assembly, slowly move it from the outside of the cantilever end on the flexible leg side of the beam toward the beam. After adjusting the alignment between the trolley wheels and the center line of the track, let the trolley wheels on the non-driver's cab side fall onto the track. Then slowly slide the trolley frame so that the trolley wheels on the driver's cab side fall onto the track. Slide the trolley frame closer to the flexible leg door frame. Use a hand hoist and wire rope to tie and secure the trolley frame to prevent it from sliding toward the cantilever end on the flexible leg side. Install the buffer, fixing bracket, and cable drag chain system in a timely manner.

[0013] S8. Install the cable reel: When hoisting, conduct a trial hoist first, and keep it for 3 minutes without any abnormality before lifting normally;

[0014] S9. Lifting and installing accessories: Arrange the tire frame, lifting beam, jack, pads and pads at the lifting position below the lower crossbeam, install the trolley anchor, install the spreader and the spreader frame, and thread the lifting wire rope into place;

[0015] S10. Debugging of the whole machine: Reduce the transfer and displacement of the whole machine before shipment. If displacement is really necessary, lift it to a level again after displacement. The adjustment pads added during displacement should be spot welded to the temporary track. The gears should be adjusted into place to ensure that the wheel rims are lower than the track treads. Debugging of the whole machine should be carried out after displacement.

[0016] Furthermore, in step S1, when marking, the track is adjusted to meet the track gauge requirements, the track straightness is ≤2mm / 2m, the total length is ≤5m, and the height difference of the track with the same cross-section is ≤20mm.

[0017] Furthermore, in step S3, after the rigid leg side door frame is installed, the center punch point of the lower beam is used as a reference to measure the center gauge of the lower beam at both ends, the lower beam angle square, the lower beam level, and the upper opening data of the leg door frame.

[0018] Furthermore, in step S4, after the beam assembly is hoisted into place, the lower ends of the lower cross beams on the rigid and flexible leg sides are adjusted to align with the door frame legs respectively, and the upper surfaces of the tracks at the four 0 points of the beam are adjusted to be in the same plane. After welding, the wave ropes are loosened, and the arch of the beam, the centering and verticality of the door frame are inspected. After the inspection is completed, the wave ropes of the door frame on the rigid leg side are removed, and the wave ropes of the door frame on the flexible leg side are not removed for the time being.

[0019] Furthermore, in steps S4 and S5, if the ribs cannot be aligned on all four sides before welding, it is necessary to make adjustments, heat and insulate the weld, and inspect it after 24 hours.

[0020] Furthermore, in step S5, before the diagonal brace is hoisted, the process platform, positioning card, and traction rope are installed in place on the ground, and after the verticality of the flexible leg side door frame is re-measured and meets the requirements, the wave and wind rope is tightened, and then the diagonal brace is hoisted and adjusted.

[0021] Furthermore, in step S7, the ladder platform, various mechanisms and the driver's cab are arranged on the ground before the trolley assembly is hoisted.

[0022] Furthermore, in step S8, during trial lifting, the component is lifted 100 mm away from the tire frame.

[0023] Furthermore, in step S9, the shipping struts are installed according to the actual assembly and commissioning conditions, and the lower ends of the struts are disconnected from the flexible legs and suspended with steel wire ropes before commissioning.

[0024] The advantages of the present invention are as follows: before hoisting the rigid-leg side door frame and the flexible-leg side door frame, the upper opening size is re-measured; after positioning using the lower crossbeam center positioning ring and the connecting bracket positioning hole, the trolley walking mechanism is positioned and connected to the rigid-leg side door frame; before hoisting the beam assembly, the beam arch is re-measured; the beam assembly is hoisted into place in a stable state; before welding the rigid and flexible leg side lower crossbeams to the large seams between the rigid and flexible legs, the four-sided reinforcement is confirmed; accurate positioning is achieved during installation, installation accuracy is guaranteed, and various components are gradually installed in a suitable installation sequence; good balance and stability are achieved during hoisting and installation, reducing safety risks;

[0025] After hoisting the trolley assembly, slowly move it from the outside of the cantilever end on the flexible leg side of the beam toward the beam, adjust the trolley wheels and the center line of the track to align and overlap, so that the trolley wheels on the non-driver's cab side fall onto the track, and then slowly slide the trolley frame so that the trolley wheels on the driver's cab side fall onto the track, and slide the trolley frame close to the flexible leg door frame side, instead of directly hoisting the trolley assembly onto the track. This makes the placement more accurate, eliminates the trouble of adjustment, and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the state of the rigid leg side door frame of the present invention when it is hoisted;

[0027] Figure 2 This is a schematic diagram of the state of the flexible-leg side door frame of the present invention when it is hoisted;

[0028] Figure 3 It is a schematic diagram of the state of the girder hoisting of the present invention;

[0029] Figure 4 This is a schematic diagram of the state of the rigid leg side beam hoisting of the present invention;

[0030] Figure 5 Schematic diagram of the welding sequence of the upper crossbeams and the supporting legs on the rigid and flexible leg sides of the present invention;

[0031] Figure 6 This is a schematic diagram of the state of the diagonal brace hoisting of the present invention;

[0032] Figure 7 This is a schematic diagram of the hoisting state of the high-voltage room and the electrical room on the flexible leg side of the present invention;

[0033] Figure 8 This is a schematic diagram of the hoisting state of the trolley assembly of the present invention;

[0034] Figure 9 Schematic diagram of the cable reel of the present invention in a hoisting state;

[0035] Figure 10 It is a schematic diagram of the hoisting state of the accessory of the present invention. Implementation Method

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following examples can enable those skilled in the art to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0037] This specific implementation adopts the following technical solution: including the following steps:

[0038] S1. Track layout: clean the site, select a location with harder geology in the assembly area near the gantry crane, lay two rows of 316 roller beams and steel plates, mark the lines after cleaning, measure and adjust the tracks, and adjust the tracks to meet the track gauge requirement of 40000±4mm, the difference between diagonals ≤5mm, the track straightness ≤2mm / 2m, the total length ≤5m, and the height difference of the track with the same cross-section ≤20mm. Due to the special structure of the gantry of the project, assembly is preferably carried out at the assembly sites on both sides of the riverside gantry crane. Before assembly, confirm the site bearing conditions to ensure the safety and stability of the rail crane during assembly.

[0039] S2. Arrange the trolley traveling mechanism: hoist 4 sets of trolley traveling mechanisms 1 onto the arranged track, use jacking tooling to support the walking to prevent tipping, install the trolley connecting bracket and the trolley traveling mechanism 1 in place, ensure that the center line of the trolley connecting bracket and the trolley traveling mechanism 1 coincide, measure the data according to the inspection requirements, and require the straightness of a single set of trolleys to be controlled within the range of ±0.5mm. After jacking to the level, pad the wheels and tracks with pads, unload the jack, and after re-testing, use the trolley gear to position the traveling wheels to prevent sliding. This jacking state is used as the basis for subsequent data measurement. Parts that interfere with the jacking device need to be removed and restored to their original position without jacking. The angular deviation between the center line of the wheel hole of the traveling trolley and its theoretical center line in the horizontal plane shall not exceed ±0.04%, and the deviation between the center of the wheel rolling on the same track and the center of the track shall not exceed ±1mm.

[0040] S3. Hoisting the rigid leg side door frame and the flexible leg side door frame: Figure 1 As shown, the door frame is in the hoisting position before hoisting and will not move anymore. Re-measure the size of the upper opening. It can be hoisted after it meets the assembly process requirements. First, use a 120T gantry crane to hoist the rigid leg side U-shaped door frame 2 to the trolley walking mechanism 1 position, use the lower beam center positioning ring and the connecting bracket positioning hole to position, use the guide pin to position the trolley walking mechanism 1 and the rigid leg side door frame 2, use process bolts to connect the two, and hoist the whole to the assembly track. To ensure safety, after pulling the wave wind wire rope, you can loosen the hook, fix the safety wire rope clamp, and use the wave wind ropes on both sides to adjust the verticality of the door frame. After the rigid leg side door frame 2 is installed, use the lower beam center sample punch point as a reference to measure the center gauge of the lower beam at both ends, the lower beam angle ruler, the lower beam level, and the upper opening data of the leg door frame, and then hoist and install the flexible leg side door frame 3, as shown Figure 2As shown, the installation steps of the flexible leg side door frame 3 are the same as the installation steps of the rigid leg side door frame 2.

[0041] The door frame assembly lugs are installed with GB1228 high-strength bolt groups, tightened with a final tightening torque of 920N.m. The nuts are on the outside of the box. The bolt groups are used only once for lifting and are returned to the warehouse for use as ordinary bolts. The connecting brackets are installed with 8.8-grade process bolt groups, tightened with a final tightening torque of 1060N.m. The bolt groups are also used only once for lifting.

[0042] S4. Hoisting beam components: Figure 3 and Figure 4 As shown, before hoisting the beam assembly 4, the margins at the lower joints of the upper cross beams 22 on the rigid and flexible leg sides are trimmed according to the flatness of the flange on the door frame support legs and the overall height. Before hoisting, the lower end of the inclined ladder is disengaged from the connector and not fixed. It is fixed after hoisting. Before hoisting the beam assembly 4, the beam arch is remeasured. Before hoisting, the buffer and the fixing bracket at the flexible leg side beam end are not installed temporarily. They are installed after the trolley frame is hoisted into place. Two 120T gantry cranes are used to synchronize the beam assembly 4 to make it stable for hoisting into place. The lower cross beams 21 on the rigid and flexible leg sides are welded to the large joints between the rigid and flexible legs respectively. Before welding, confirm the reinforcement on all four sides. If the reinforcement cannot be faced on all four sides, it is necessary to make adjustments. The welding is symmetrical during welding, and the welds are heated and insulated. After 24 hours, the upper cross beams 22 on the rigid and flexible leg sides are welded to the support legs. The welding sequence is as follows Figure 5 As shown, welding is carried out in the order of 1-2-3-4, and the hoisting operation of the beam assembly 4 is required to be carried out under a wind force less than level 5 (10m / s).

[0043] After the beam assembly 4 is hoisted into place, adjust the lower ends of the lower cross beams 21 on the rigid and flexible leg sides to align with the door frame legs respectively, and adjust so that the upper surfaces of the tracks at the four 0 points of the beam are in the same plane. After welding, loosen the wave ropes, and inspect the beam arch, door frame centering, and verticality. After the inspection is completed, remove the wave ropes of the rigid leg side door frame, and do not remove the wave ropes of the flexible leg side door frame for the time being.

[0044] S5. Lifting diagonal brace: Figure 6As shown, before hoisting the diagonal brace 5, the process platform, positioning card and traction rope are installed in place on the ground. After re-measurement of the verticality of the flexible leg side door frame 3 to meet the requirements, the wave and wind rope are tightened, and then the diagonal brace 5 is hoisted and adjusted. During hoisting, after the diagonal brace 5 is close to the door frame component, the upper flange plate of the diagonal brace 5 is gradually adjusted to fit tightly against the lower end of the end beam of the beam 4, and the margin of the lower end of the diagonal brace 5 is gradually trimmed. After adjusting the trimming margin, the diagonal brace 5 is installed in place. After the diagonal brace 5 and the end beam and rigid leg are spot-welded firmly, the hook is loosened, and then the process platform at the welding point of the rigid leg and the diagonal brace large seam is fully installed. Finally, the large seam between the diagonal brace 5 and the end beam of the beam 4 and the diagonal brace 5 and the rigid leg is welded. Before welding, confirm the reinforcement on all four sides. If the reinforcement on all four sides cannot be faced, it is necessary to make adjustments, weld symmetrically, heat and insulate the weld, inspect after 24 hours, and remove the wave and wind ropes of the process platform and the flexible leg side door frame 3.

[0045] S6. Hoisting electrical room and high voltage room: Figure 7 As shown, re-measure the openings and angles of the high-voltage room bracket and the electrical room bracket, verify the openings and angles of the corresponding connecting plates of the high-voltage room base frame and the electrical room base frame, hoist the high-voltage room 6 and the electrical room 7, and after hoisting into place, connect the base frame and the bracket bolts and then loosen the hook. When installing the high-voltage room 6 and the electrical room 7 base frame and bracket bolts, use a climbing vehicle for assistance.

[0046] S7, hoisting trolley assembly: Figure 8 As shown, before hoisting the trolley assembly 8, the ladder platform, various mechanisms and the driver's cab are arranged on the ground. After hoisting the trolley assembly 8, it is slowly moved from the outside of the cantilever end on the flexible leg side of the beam to the beam 4. After adjusting the alignment of the trolley wheels and the center line of the track, the trolley wheels on the non-driver's cab side fall onto the track, and then slowly slide the trolley wheels on the driver's cab side of the trolley frame to fall onto the track, and slide the trolley frame close to the flexible leg door frame side, and use a hand hoist and wire rope to tie and fix the trolley frame to prevent the trolley frame from sliding toward the cantilever end on the flexible leg side, and install the buffer, fixed bracket and cable drag chain system in time.

[0047] S8. Install the cable reel: Figure 9 As shown, before hoisting, confirm that the door frame is in a horizontal state. When hoisting, conduct a trial hoisting first. During the trial hoisting, the cable reel 9 component is hoisted 100mm away from the tire frame. Keep it for 3 minutes without any abnormal phenomenon and then lift it normally.

[0048] S9, jacking installation accessories: such as Figure 10 As shown, a tire frame, a lifting beam, a jack, a pad and a pad are arranged at the lifting position below the lower cross beam 21, the trolley anchor is installed, the sling and the sling rack are installed, the lifting wire rope is passed into place, and the shipping strut 10 is installed according to the actual situation of assembly and commissioning. Before commissioning, the lower end of the strut 10 is disconnected from the flexible leg and suspended with a wire rope.

[0049] S10. Debugging of the whole machine: Reduce the transfer and displacement of the whole machine before shipment. If displacement is really necessary, re-lift it to the level after displacement. The track pads and car stops are in place and installed firmly. To ensure safety, the added adjustment pads are spot-welded to the temporary track. After use, remove the pads to restore the track. If only adding pads under the track cannot meet the horizontal requirements of the whole machine, you can add another pad (within 10mm) on the track tread. If two machines share the same track position, directly add pads (within 15mm) on the track tread. Adjust the car stops in place to ensure that the wheel rims are lower than the track tread. Debug the whole machine after displacement.

[0050] In this specific implementation method, the upper opening size is re-measured before hoisting the rigid leg side door frame and the flexible leg side door frame, and the trolley walking mechanism is positioned and connected to the rigid leg side door frame after positioning using the lower crossbeam center positioning ring and the connecting bracket positioning hole. The beam arch is re-measured before hoisting the beam assembly, and the beam assembly is hoisted into place in a stable state. The four-sided reinforcement is confirmed before welding the rigid and flexible leg side lower crossbeams to the large seams between the rigid and flexible legs respectively. The positioning is accurate during installation, the installation accuracy is guaranteed, and each component is installed one by one according to the appropriate installation order. It is installed in one step, with good balance and stability during hoisting and installation, which reduces safety risks. After hoisting the trolley assembly, slowly move it from the outside of the cantilever end on the flexible leg side of the beam toward the beam, adjust the trolley wheels and the center line of the track to align and overlap, so that the trolley wheels on the non-driver's cab side fall onto the track, and then slowly slide the trolley wheels on the driver's cab side of the trolley frame to fall onto the track, and slide the trolley frame close to the flexible leg door frame side, instead of directly hoisting the trolley assembly onto the track. The placement is more accurate, eliminating the trouble of adjustment and improving the assembly efficiency.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for assembling a semicircular beam rail crane, characterized by: The following steps are involved: S1. Track layout: Clean the site, select a location with relatively hard geology in the assembly area near the gantry crane, lay two rows of track beams and steel plates, mark the tracks after cleaning, and measure and adjust the tracks; S2. Arrange the trolley travel mechanism: hoist the trolley travel mechanism onto the arranged track, use the jacking tool to support the travel to prevent tipping, install the trolley connecting bracket and the trolley travel mechanism in place, ensure that the center line of the trolley connecting bracket and the trolley travel mechanism coincides, after jacking up to a level, pad the wheels and the track with pads, and after re-testing and passing, use the trolley gear to position the travel wheels to prevent sliding. This jacking state serves as the basis for subsequent data measurement; S3. Hoist the door frame on the rigid leg side and the flexible leg side: Before hoisting the door frame, remeasure the upper opening size. First, hoist the door frame on the rigid leg side to the trolley travel position. Use the center locating ring of the lower crossbeam and the locating hole of the connecting bracket to position it. Position the trolley travel mechanism and the rigid leg side door frame. Hoist the entire frame onto the assembly track. Use the wind ropes on both sides to adjust the verticality of the door frame. Then hoist and install the flexible leg side door frame. The installation steps are the same as those for the rigid leg side door frame. S4. Hoisting the beam assembly: Before hoisting the beam assembly, trim the margins at the lower ends of the upper crossbeams on the rigid and flexible leg sides according to the flatness and overall height of the flanges on the door frame legs. Re-measure the beam arch before hoisting the beam assembly. Before hoisting, do not install the buffer and fixing bracket at the flexible leg side beam end. Install them after the trolley frame is hoisted into place. The two gantry cranes operate synchronously to stabilize the beam assembly for hoisting into place. Weld the lower crossbeams on the rigid and flexible leg sides to the large seams between the rigid and flexible legs respectively. Confirm the reinforcement on all four sides before welding, and weld symmetrically. S5. Hoisting the diagonal brace: When hoisting, after the diagonal brace is close to the door frame component, gradually adjust the upper flange plate of the diagonal brace to fit closely with the lower end of the end beam of the beam. Simultaneously, gradually trim the allowance of the lower end of the diagonal brace. After adjusting the trimming allowance, install the diagonal brace in place. After the diagonal brace is firmly spot-welded to the end beam of the beam and the rigid leg, loosen the hook. Then, install the process platform at the large joint between the rigid leg and the diagonal brace. Finally, weld the large joint between the diagonal brace and the end beam of the beam and the diagonal brace and the rigid leg. Before welding, confirm the reinforcement on all four sides, weld symmetrically, and remove the wind ropes on the process platform and the flexible leg side door frame. S6. Hoisting the electrical room and high-voltage room: Re-measure the openings and angles of the high-voltage room brackets and the electrical room brackets, and re-check the openings and angles of the corresponding connecting plates of the high-voltage room base frame and the electrical room base frame. Hoist the high-voltage room and the electrical room. After hoisting into place, connect the base frame and bracket bolts and then release the hooks; S7. Hoisting the trolley assembly: After hoisting the trolley assembly, slowly move it from the outside of the cantilever end on the flexible leg side of the beam toward the beam. After adjusting the alignment between the trolley wheels and the center line of the track, let the trolley wheels on the non-driver's cab side fall onto the track. Then slowly slide the trolley frame so that the trolley wheels on the driver's cab side fall onto the track. Slide the trolley frame closer to the flexible leg door frame. Use a hand hoist and wire rope to tie and secure the trolley frame to prevent it from sliding toward the cantilever end on the flexible leg side. Install the buffer, fixing bracket, and cable drag chain system in a timely manner. S8. Install the cable reel: When hoisting, conduct a trial hoist first, and keep it for 3 minutes without any abnormality before lifting normally; S9. Lifting and installing accessories: Arrange the tire frame, lifting beam, jack, pads and pads at the lifting position below the lower crossbeam, install the trolley anchor, install the spreader and the spreader frame, and thread the lifting wire rope into place; S10. Debugging of the whole machine: Reduce the transfer and displacement of the whole machine before shipment. If displacement is really necessary, lift it to a level position again after displacement. The adjustment pads added during displacement should be spot welded to the temporary track. The gears should be adjusted into place to ensure that the wheel rims are lower than the track treads. Debug the whole machine after displacement.

2. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S1, when marking, the track is adjusted to meet the track gauge requirements, the track straightness is ≤2mm / 2m, the total length is ≤5m, and the height difference of the track with the same cross section is ≤20mm.

3. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S3, after the rigid leg side door frame is installed, the center gauge of the lower beam at both ends, the lower beam angle square, the lower beam level, and the upper opening data of the leg door frame are measured based on the center punch point of the lower beam.

4. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S4, after the beam assembly is hoisted into place, the lower ends of the lower cross beams on the rigid and flexible leg sides are adjusted to align with the door frame legs respectively, and the upper surfaces of the tracks at the four 0 points of the beam are adjusted so that they are in the same plane. After welding, the wave ropes are loosened, and the beam arch, door frame centering and verticality are inspected. After the inspection is completed, the wave ropes of the rigid leg side door frame are removed, and the wave ropes of the flexible leg side door frame are not removed for the time being.

5. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In the steps S4 and S5, if the ribs cannot be aligned on all four sides before welding, it is necessary to make adjustments, heat and insulate the weld, and inspect it after 24 hours.

6. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S5, before the diagonal brace is hoisted, the process platform, positioning card, and traction rope are installed in place on the ground, and after the verticality of the flexible leg side door frame is re-measured and meets the requirements, the wave and wind rope is tightened, and then the diagonal brace is hoisted and adjusted.

7. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S7, the ladder platform, various mechanisms and the driver's cab are arranged on the ground before the trolley assembly is hoisted.

8. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S8, during trial hoisting, the component is hoisted 100 mm away from the jig.

9. The method for assembling a semicircular beam rail crane according to claim 1, characterized in that: In step S9, the shipping struts are installed according to the actual situation of final assembly and commissioning. Before commissioning, the lower ends of the struts are disconnected from the flexible legs and suspended with steel wire ropes.

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