Split type rolling mill housing assembling and hoisting method and device

Abstract

The invention relates to the technical field of rolling mill housing assembling, in particular to a split type rolling mill housing assembling and hoisting method and device.The split type rolling mill housing assembling and hoisting method comprises the following steps that S1, a plurality of supports are manufactured and arranged in a row, and two or more jacks and a plurality of sizing block sets are placed on each support; s2, a first memorial archway stand column is hoisted to a jack and a sizing block set of a support through a crown block; s3, fine adjustment is conducted on the first memorial archway stand columns through a jack, and padding is conducted through a sizing block set; s4, an upper connecting sleeve is hoisted; s5, hoisting a lower connecting sleeve; s6, the second memorial archway stand column, the upper connecting sleeve and the lower connecting sleeve are assembled and aligned; s7, after all the parts of the rolling mill housing are hoisted, assembled and aligned, housing connecting bolts are inserted and fastened; and S8, a rolling mill roll bending block and a lining plate are installed on a rolling mill housing, and hexagon bolts are fastened through an inner hexagon bolt fastening tool. The assembling device has the technical effect of improving the assembling efficiency and the assembling precision.

Description

Technical Field

[0001] The invention relates to the technical field of rolling mill arch assembly, and in particular to a method and a device for assembling and hoisting a split type rolling mill arch. Background Art

[0002] In the installation of steel rolling equipment, the mill arches with product widths below 4300mm are mostly designed as integral structures. The mill arches with product widths above 4800mm are very difficult to manufacture, transport and install due to their large size and weight, and split assembly design structures have begun to appear. In this case, the weight of a single piece is still 90-170t, and the total weight may reach 600t.

[0003] After the split rolling mill arch arrives at the project site, the first thing to do is to assemble the various components. Generally, the flat assembly method is adopted. The four main parts of the arch need to be accurately leveled and aligned during assembly. The connecting bolts need to cross the arch parts during assembly. Due to their large length, it is difficult to control the internal gap, which causes the bolts to collide and be damaged, resulting in low assembly efficiency, long construction period and high construction cost. Summary of the invention

[0004] The invention provides a method and a device for assembling and hoisting a split-type rolling mill arch, which has the technical effect of improving assembly efficiency and assembly accuracy.

[0005] On the one hand, a split-type rolling mill arch assembly method of the present invention adopts the following technical solution: A method for assembling and hoisting a split-type rolling mill arch comprises the following steps: S1. Make a number of supports and arrange them in a row, and place two or more jacks and several shim groups on each support; S2. Lift the first archway column onto the jack and shim assembly of the support through the overhead crane, and align the grooves of the first archway column with the upper connecting sleeve and the lower connecting sleeve upward; S3. Use a jack to fine-tune the first archway column, and pad it with a shim set, and use an electronic level and a frame level to check the level; S4, then hoist the upper connecting sleeve, assemble and align the upper connecting sleeve with the first archway column; S5. Hoist the lower connecting sleeve, assemble and align the lower connecting sleeve with the first archway column; S6, then assemble and align the second archway column with the upper connecting sleeve and the lower connecting sleeve; S7. After the hoisting, assembly and alignment of the rolling mill arch parts are completed, the arch connecting bolts are inserted and tightened; S8. Install the rolling mill bending roll block and liner on the rolling mill arch, and tighten the hexagonal bolts using the hexagonal bolt tightening tool.

[0006] Furthermore, three supports are provided, which correspond to the upper part, the middle part and the lower part of the first archway column respectively. Two jacks are provided on each support, and the two jacks are symmetrically arranged about the center position of the support.

[0007] Furthermore, in step S3, the first arch column is fine-tuned by a jack so that the horizontality of the first arch column reaches the required allowable deviation within 0.03 / 1000; in step S4, the upper connecting sleeve is aligned, and the flatness of the two planes on the transmission side and the operating side common to the upper connecting sleeve and the first arch column is allowed to deviate by 0.2mm within the full height range.

[0008] Furthermore, in step S7, after the archway connecting bolts are inserted, the archway connecting bolts need to be lengthened to facilitate the hydraulic tensioner to tighten the archway connecting bolts, remove the extended section, and cut the portion of the bolt rod that exposes the nut.

[0009] Furthermore, the hexagonal bolt fastening tool includes a steel pipe, a hexagonal head, a cross bar and a flat plate. The cross bar is fixed at one end of the steel pipe, the hexagonal head is fixed at the other end of the steel pipe, the axis of the cross bar is perpendicular to the axis of the steel pipe, and the flat plate is fixed on the outer wall of the steel pipe. During operation, the hexagonal head at one end is inserted into the head of the bolt to be fastened, the cross bar at the other end is used for pulling with a hand winch, and the flat plate next to it is used for hammering and fastening.

[0010] Furthermore, after step S8, add the following steps: S9. Install the rolling mill base in the foundation pit of the rolling mill foundation, lay two parallel sliding rails on the rolling mill foundation, and slideably connect the two sliding rails with hydraulic lifting devices and hydraulic jacking devices. Adjust the sliding rails by measuring to make their overall center line coincide with the installation center line of the archway; S10, using the hydraulic lifting device, the hydraulic lifter connects the steel wire rope from the middle of the rolling mill arch through the hydraulic lifting steel strand and the hoist, starts the third hydraulic slide, the third hydraulic slide pushes the bottom beam of the hydraulic lifter to slide on the hydraulic lifting double beam, the hydraulic lifter steel strand moves from the middle of the two beams of the hydraulic lifting double beam and descends, and the rolling mill arch is laid down to a flat posture; a stable support is made under the rolling mill arch, and an operating space for the clamping beam for lifting is reserved between the rolling mill arch and the rolling mill foundation; S11. Install a clamping beam on the rolling mill arch, connect the two hangers under the hydraulic lifting device to the ear shafts at both ends of the clamping beam, connect the tail of the rolling mill arch to the two lifting ears of the crossbeam of the hydraulic lifting device with a steel wire rope, and use the hydraulic lifter and the hydraulic lifting device to lift the arch at the same time to make the arch parallel to the ground; S12, simultaneously starting the first hydraulic slide under the hydraulic lifter and the second hydraulic slide under the hydraulic jacking device to push the mill arch to move horizontally toward the mill base; S13, when the tail of the rolling mill arch exceeds the edge of the foundation pit of the rolling mill body, the hydraulic jacking device is operated to descend, and the whole body continues to slide, and the tail of the rolling mill arch continues to descend along with the hydraulic jacking device, and the whole rolling mill arch gradually turns up and reaches a vertical state, and reaches directly above the installation position; S14. Disconnect the lifting wire rope of the hydraulic lifting device from the rear of the rolling mill arch, and operate the hydraulic lifting device to descend alone. The azimuth torsional deviation of the rolling mill arch can be adjusted by moving the first hydraulic slider forward and backward until the rolling mill arch is completely in place on the rolling mill base.

[0011] On the other hand, the present invention also provides a device for assembling and hoisting a split-type rolling mill arch, which adopts the following technical solution: A device for assembling and hoisting a split mill arch comprises a plurality of support components for supporting the mill arch. The support components comprise a support on which two jacks are fixed. The two jacks are symmetrically arranged about the support, and a plurality of shim groups are installed on the support.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. The rolling mill arch is assembled sideways in the width direction of the arch. Since the installation sequence is from bottom to top, only the first arch column needs to be accurately leveled. After the other components are in place, they can directly meet the horizontality requirements without adjusting the horizontality. The arch connecting bolts are vertically inserted into the arch for assembly, which is beneficial to prevent thread damage and significantly improve the overall assembly efficiency.

[0013] 2. The support is made of steel and supported at three points at both ends and in the middle of the rolling mill arch. It is precisely aligned with ultra-thin jacks and shim groups to improve the efficiency of arch assembly.

[0014] 3. There are many designs of hexagon socket bolts installed in the accessories of the rolling mill arch. A special fastening device has been developed to solve the problem that these hexagon socket bolts are difficult to tighten.

[0015] 4. A lifting scheme combining a hydraulic lifting device and a hydraulic jacking device is adopted. The hydraulic lifting device and the hydraulic jacking device share a sliding track. A set of hydraulic lifting devices is used for lifting the main lifting, which solves the problem of insufficient lifting capacity of the hydraulic jacking device for lifting the main lifting. At the same time, the overturning method is used to effectively reduce the height of the hydraulic lifting device tower, saving materials and production costs. The hydraulic jacking device is used to carry the load when the tail of the arch is translated and overturned, avoiding the problem of insufficient lifting capacity when the tail is lifted by the overhead crane.

[0016] 5. The method and device have a simple structure, which improves the work efficiency of the rolling mill arch assembly, significantly shortens the operation time, ensures the construction quality, improves the safety of equipment and operators, and reduces the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present invention, and do not constitute a limitation of the present invention. In the drawings: Figure 1 A process flow chart showing the assembly method of the present invention; Figure 2 A schematic diagram of a support assembly in the present invention; Figure 3 A schematic diagram showing the installation of the first memorial archway column in the present invention; Figure 4 A schematic diagram showing the installation of the upper connecting sleeve in the present invention; Figure 5 A schematic diagram showing the installation of the lower connecting sleeve in the present invention; Figure 6 A schematic diagram showing the installation of the second archway column in the present invention; Figure 7 A schematic diagram showing the installation of the archway connecting bolts in the present invention; Figure 8 A front view of a hexagon socket bolt fastening tooling according to the present invention; Fig. 9 A top view of the hexagon socket bolt fastening tooling of the present invention; Fig.10 A schematic diagram showing a rolling mill foundation and a sliding track in the present invention; Fig.11 A schematic diagram showing the installation positions of the rolling mill arch and the sliding rail in the present invention; Fig.12 A schematic diagram showing the method of laying down the mill arch in the present invention; Fig.13 A schematic diagram showing the installation of a rolling mill arch on a clamping beam in the present invention; Fig.14 A schematic diagram showing the hydraulic lifting device of the present invention lifting the tail of the rolling mill arch; Fig.15 A schematic diagram of a hydraulic lifting device and a hydraulic jacking device for translating a rolling mill arch in the present invention; Fig.16 A schematic diagram showing the turning over of the rolling mill arch in the present invention; Fig.17 It is a schematic diagram showing the vertical positioning of the rolling mill arch in the present invention.

[0018] Explanation of reference numerals: 1. Rolling mill arch; 11. First arch column; 12. Upper connecting sleeve; 13. Lower connecting sleeve; 14. Second arch column; 15. Arch connecting bolt; 16. Transmission side; 17. Operation side; 2. Support assembly; 21. Support; 22. Jack; 23. Washer group; 3. Hexagon socket bolt fastening tool; 31. Steel pipe; 32. Hexagon head; 33. Cross bar; 34. Plate; 4. Rolling mill foundation; 41. Foundation pit; 42. Rolling mill base; 43. Sliding rail; 5. Hydraulic lifting device; 51. Hydraulic lifting tower; 52. Hydraulic lifter; 53. Hydraulic lifter bottom beam; 54. Hydraulic lifting double beam; 55. First hydraulic slider; 56. Third hydraulic slider; 57. Hydraulic lifting steel strand; 58. Lifting device; 59. Clamp beam; 6. Hydraulic jacking device; 61. Hydraulic telescopic support legs; 62. Hydraulic jacking beam; 63. Lifting ear seat; 64. Second hydraulic slider. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0020] Reference Figure 1-Figure 17 A device for assembling and hoisting a split-type rolling mill arch comprises a support assembly 2. Three support assemblies 2 are provided, corresponding to the upper, middle and lower positions of a first arch column 11 respectively. The support assembly 2 comprises a support 21. The support 21 is made of H-shaped steel. Two jacks 22 are fixed on the support 21. The two jacks 22 are symmetrical about the center position of the support 21. The jacks 22 are ultra-thin jacks 22. Shim groups 23 are fixed on the four corners above the support 21.

[0021] The rolling mill arch 1 comprises a first arch column 11, an upper connecting sleeve 12, a lower connecting sleeve 13 and a second arch column 14. One side of the rolling mill arch 1 is a transmission side 16, and the side opposite to the transmission side 16 is an operating side 17.

[0022] When installing the rolling mill arch 1 , firstly hoist the first arch column 11 onto the supporting assembly 2 , then install the upper connecting sleeve 12 and the lower connecting sleeve 13 on the first arch column 11 , and then install the second arch column 14 on the upper connecting sleeve 12 and the lower connecting sleeve 13 .

[0023] Considering that after the arch is assembled, it needs to be hoisted into the rolling mill base 42, the installation site is selected as close to the rolling mill foundation 4 as possible. A split rolling mill arch assembly method of the present invention is selected on the roll changing side of the rolling mill.

[0024] A method for assembling and hoisting a split-type rolling mill arch comprises the following steps: S1, make three supports 21 and arrange them in a row, the distances between the three supports 21 correspond to the upper part, the middle part and the lower part of the first archway column 11 respectively, place a jack 22 and a plurality of shim groups 23 on the supports 21, see Figure 2 .

[0025] S2, hoist the first archway column 11 to the jacks 22 and several shim groups 23 of the three supports 21 through the overhead crane, and assemble the first archway column 11 with the upper connecting sleeve 12 and the lower connecting sleeve 13 with the groove direction upward, see Figure 3 .

[0026] S3. Use the jack 22 to fine-tune the first archway column 11, so that the levelness of the first archway column 11 reaches the required allowable deviation within 0.03 / 1000, and pad it with the shim group 23. Use the electronic level and frame level to check the level, and the paint film on the measuring points of each component must be removed to ensure the measurement accuracy.

[0027] S4, then hoist the upper connecting sleeve 12, assemble and align the upper connecting sleeve 12 with the first archway column 11, plug and match the boss of the upper connecting sleeve 12 with the groove of the first archway column 11, and align the upper connecting sleeve 12. The flatness of the two planes of the transmission side 16 and the operating side 17 shared with the first archway column 11 is allowed to deviate by 0.2mm within the full height range, see Figure 4 .

[0028] S5, hoist the lower connecting sleeve 13, assemble and align the lower connecting sleeve 13 with the first archway column 11, plug and match the boss of the lower connecting sleeve 13 with the groove of the first archway column 11, and align the lower connecting sleeve 13. The flatness of the two planes of the transmission side 16 and the operating side 17 shared with the first archway column 11 is allowed to deviate by 0.2mm within the full height range, see Figure 5 .

[0029] S6, then assemble and align the second archway column 14 with the upper connecting sleeve 12 and the lower connecting sleeve 13, plug and match the bosses on the upper connecting sleeve 12 and the lower connecting sleeve 13 with the corresponding grooves on the second archway column 14, and align the second archway column 14. The flatness of the two planes of the transmission side 16 and the operating side 17 shared with the first archway column 11 and the upper and lower connecting sleeves 13 is allowed to deviate by 0.2mm within the full height range, see Figure 6 .

[0030] S7. After the components of the rolling mill arch 1 are hoisted, assembled and aligned, the arch connecting bolts 15 are inserted and tightened. Figure 7 .

[0031] S8, after the archway connecting bolts 15 are passed through and the extension section is added, the bolts are tightened and tightened by the hydraulic tensioner. After the bolts are tightened, the extension section is removed and the part of the bolt rod that exposes the nut is cut. A threaded hole is set at the end of the bolt, and an extension rod is threadedly connected in the threaded hole. When the bolts are tightened by the hydraulic tensioner, the bolts need to be lengthened.

[0032] S9. Install the rolling mill bending roll blocks and lining plates on the arch.

[0033] During installation, use a bolt tightening tool to tighten the hexagon socket bolts. The hexagon socket bolt tightening tool 3 includes a steel pipe 31, a hexagon socket head 32, a cross bar 33 and a plate 34. The cross bar 33 is fixed to one end of the steel pipe 31, the hexagon socket head 32 is fixed to the other end of the steel pipe 31, the axis of the cross bar 33 is perpendicular to the axis of the steel pipe 31, and the plate 34 is fixed to the outer wall of the steel pipe 31. During operation, the hexagon socket head 32 at one end is inserted into the head of the bolt to be tightened, the cross bar 33 at the other end is used for pulling with a hand winch, and the plate 34 next to it is used for hammering and tightening, see Figure 8 and Fig. 9 .

[0034] Next, the assembled archway will be hoisted.

[0035] Reference Figure 10-Figure 17 A rolling mill base 42 is installed in a foundation pit 41 of the rolling mill foundation 4, two parallel sliding rails 43 are laid on the rolling mill foundation 4, and a hydraulic lifting device 5 and a hydraulic jacking device 6 are slidably connected to the two sliding rails 43.

[0036] The hydraulic lifting device 5 includes a hydraulic lifting tower 51, a hydraulic lifter 52 and a hydraulic lifter bottom beam 53. Each sliding track 43 corresponds to a hydraulic lifting tower 51. A first hydraulic slider 55 for driving the hydraulic lifting tower 51 is installed on the sliding track 43. The first hydraulic slider 55 can drive the hydraulic lifting tower 51 to slide along the sliding track 43.

[0037] A hydraulic lifting double beam 54 is fixed on the hydraulic lifting tower 51, a hydraulic lifter bottom beam 53 spans over the hydraulic lifting double beam 54, a third hydraulic slider 56 is installed at the bottom of the hydraulic lifter bottom beam 53, and the third hydraulic slider 56 pushes the hydraulic lifter bottom beam 53 to move along the upper surface of the hydraulic lifting double beam 54. The hydraulic lifter 52 is fixed on the hydraulic lifter bottom beam 53.

[0038] The hydraulic lifting device 6 includes a hydraulic telescopic leg 61, a hydraulic lifting beam 62 and a lifting lug seat 63. The hydraulic telescopic leg 61 is slidably connected to the sliding track 43. The sliding track 43 is provided with a second hydraulic slider 64 for driving the hydraulic telescopic leg 61 to move. The second hydraulic slider 64 can push the hydraulic telescopic leg 61 to slide along the sliding track 43. The hydraulic lifting beam 62 is fixed to the top of the hydraulic telescopic leg 61, and the lifting lug seat 63 is fixed to the hydraulic lifting beam 62. A lifting lug is fixed below the lifting lug seat 63.

[0039] The steps for hoisting the assembled rolling mill arch 1 are as follows: S10, install the rolling mill base 42 in the foundation pit 41 of the rolling mill foundation 4, lay two parallel sliding rails 43 on the rolling mill foundation 4, and slide the two sliding rails 43 to which the hydraulic lifting device 5 and the hydraulic jacking device 6 are slidably connected. The sliding rails 43 are measured and adjusted to make their overall center line coincide with the installation center line of the archway. Fig.10 and Fig.11 .

[0040] S11, using the hydraulic lifting device 5, the hydraulic lifter 52 is connected to the steel wire rope from the middle of the rolling mill arch 1 through the hydraulic lifting steel strand 57 and the hanger 58, and the third hydraulic slider 56 is started. The third hydraulic slider 56 pushes the bottom beam of the hydraulic lifter 52 to slide on the hydraulic lifting double cross beam 54, and the hydraulic lifting steel strand 57 moves and descends from the middle of the two cross beams of the hydraulic lifting double cross beam 54, and the rolling mill arch 1 is laid down to a flat posture; the rolling mill arch 1 is firmly supported, and an operating space for the hoisting clamp beam 59 is reserved between the arch and the rolling mill foundation 4, see Fig.12 ; S12, install the clamping beam 59 on the rolling mill arch 1, connect the two hangers 58 under the hydraulic lifting device 5 to the ear shafts at both ends of the clamping beam 59, connect the tail of the rolling mill arch 1 to the two lifting ears of the crossbeam of the hydraulic lifting device 6 with a steel wire rope, and use the hydraulic lifter 52 and the hydraulic lifting device 6 to lift the arch at the same time, so that the arch is parallel to the ground, see Fig.13 and Fig.14 ; S13, start the first hydraulic slider 55 under the hydraulic lifter 52 and the second hydraulic slider 64 under the hydraulic jacking device 6 at the same time, push the mill arch 1 to move horizontally toward the mill base 42, see Fig.15 ; S14, when the tail of the rolling mill arch 1 exceeds the edge of the foundation pit 41 of the rolling mill body, the hydraulic jacking device 6 is operated to descend, and the whole body continues to slide. The tail of the rolling mill arch 1 continues to descend with the hydraulic jacking device 6, and the rolling mill arch 1 as a whole gradually turns over and stands up to a vertical state, and reaches just above the installation position. Fig.16 ; S15, disconnect the hoisting wire rope of the hydraulic lifting device 6 from the tail of the rolling mill arch 1, and operate the hydraulic lifting device 5 to descend alone. The azimuth torsional deviation of the rolling mill arch 1 can be adjusted by moving the first hydraulic slider 55 forward and backward until the rolling mill arch 1 is completely in place on the rolling mill base 42. Fig.17 .

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for assembling and hoisting a split rolling mill arch, characterized in that: The steps include: S1, making a plurality of supports (21) and arranging them in a row, placing two or more jacks (22) and a plurality of shim groups (23) on each support (21); S2, hoisting the first archway column (11) onto the jack (22) and the shim assembly (23) of the support (21) by means of an overhead crane, and aligning the grooves of the first archway column (11) with the upper connecting sleeve (12) and the lower connecting sleeve (13) upward; S3. Use a jack (22) to fine-tune the first archway column (11), and pad it with a shim set (23), and use an electronic level and a frame level to check the level; S4, then hoisting the upper connecting sleeve (12), assembling and aligning the upper connecting sleeve (12) and the first archway column (11); S5, hoisting the lower connecting sleeve (13), assembling and aligning the lower connecting sleeve (13) and the first archway column (11); S6, then assembling and aligning the second archway column (14) with the upper connecting sleeve (12) and the lower connecting sleeve (13); S7. After the components of the rolling mill arch (1) are hoisted, assembled and aligned, the arch connecting bolts (15) are inserted and tightened; S8. Install the rolling mill bending roll block and lining plate on the rolling mill arch (1), and tighten the hexagonal bolts using the hexagonal bolt tightening fixture (3).

2. The method for assembling and hoisting a split-type rolling mill arch according to claim 1, characterized in that: Three supports (21) are provided, and the three supports (21) correspond to the upper part, the middle part and the lower part of the first memorial arch column (11) respectively. Two jacks (22) are provided on each support (21), and the two jacks (22) are symmetrically arranged about the center position of the support (21).

3. The method for assembling and hoisting a split-type rolling mill arch according to claim 1, characterized in that: In step S3, the first archway column (11) is finely adjusted by a jack (22) so that the horizontality of the first archway column (11) reaches a required allowable deviation of less than 0.03 / 1000; in step S4, the upper connecting sleeve (12) is aligned, and the flatness of the two planes of the transmission side (16) and the operating side (17) common to the upper connecting sleeve (12) and the first archway column (11) is allowed to deviate by 0.2 mm within the full height range.

4. The method for assembling and hoisting a split-type rolling mill arch according to any one of claims 1, 2 and 3, characterized in that: In step S7, after the archway connecting bolts (15) are inserted, the archway connecting bolts (15) need to be lengthened to facilitate the hydraulic tensioner to tighten the archway connecting bolts (15), remove the extension section, and cut the portion of the bolt rod that exposes the nut.

5. The method for assembling and hoisting a split-type rolling mill arch according to claim 1, characterized in that: The hexagon socket bolt fastening tool (3) comprises a steel pipe (31), a hexagon socket head (32), a cross bar (33) and a plate (34), wherein the cross bar (33) is fixed to one end of the steel pipe (31), the hexagon socket head (32) is fixed to the other end of the steel pipe (31), the axis of the cross bar (33) is arranged perpendicular to the axis of the steel pipe (31), and the plate (34) is fixed to the outer wall of the steel pipe (31); when operating, the hexagon socket head (32) at one end is inserted into the head of the bolt to be fastened, the cross bar (33) at the other end is used for pulling with a hand winch, and the plate (34) next to it is used for hammering and fastening.

6. The method for assembling and hoisting a split-type rolling mill arch according to claim 1, characterized in that: After step S8, add the following steps: S9, installing a rolling mill base (42) in a foundation pit (41) of a rolling mill foundation (4), laying two parallel sliding rails (43) on the rolling mill foundation (4), a hydraulic lifting device (5) and a hydraulic jacking device (6) being slidably connected to the two sliding rails (43), and measuring and adjusting the sliding rails (43) so that the entire center line thereof coincides with the installation center line of the memorial arch; S10, using the hydraulic lifting device (5), the hydraulic lifter (52) is connected to the steel wire rope from the middle of the rolling mill arch (1) through the hydraulic lifting steel strand (57) and the lifting device (58), and the third hydraulic slider (56) is started. The third hydraulic slider (56) pushes the bottom beam of the hydraulic lifter (52) to slide on the hydraulic lifting double cross beam (54), and the hydraulic lifter steel strand (57) moves from the middle of the two cross beams of the hydraulic lifting double cross beam (54) and descends, so that the rolling mill arch (1) is laid down to a horizontal position; a stable support is provided under the rolling mill arch (1), and an operating space for the hoisting clamp beam (59) is reserved between the rolling mill arch (1) and the rolling mill foundation (4); S11, installing a clamping beam (59) on the rolling mill arch (1), connecting the clamping beam (59) to the ear shafts at both ends of the clamping beam (59) through two hangers (58) below the hydraulic lifting device (5), connecting the tail of the rolling mill arch (1) to the two lifting ears of the cross beam of the hydraulic lifting device (6) by using a steel wire rope, and using the hydraulic lifter (52) and the hydraulic lifting device (6) to lift the arch at the same time, so that the arch is parallel to the ground; S12, simultaneously starting the first hydraulic slide (55) below the hydraulic lifter (52) and the second hydraulic slide (64) below the hydraulic jacking device (6), so as to push the rolling mill arch (1) to move in a direction toward the rolling mill base (42); S13, when the rear end of the rolling mill arch (1) exceeds the edge of the foundation pit (41) of the rolling mill body, the hydraulic jacking device (6) is operated to descend, and the entirety continues to slide, and the rear end of the rolling mill arch (1) continues to descend along with the hydraulic jacking device (6), and the entirety of the rolling mill arch (1) gradually turns over and stands up to a vertical state, and reaches directly above the installation position; S14, disconnect the lifting wire rope of the hydraulic lifting device (6) from the rear end of the rolling mill arch (1), and operate the hydraulic lifting device (5) alone to lower it. The azimuth torsional deviation of the rolling mill arch (1) can be adjusted by moving the first hydraulic slider (55) forward and backward until the rolling mill arch (1) is completely in place on the rolling mill base (42).

7. A method and device for assembling and hoisting a split mill arch as claimed in claim 1, characterized in that: The invention comprises a plurality of support assemblies (2) for supporting a rolling mill archway (1), wherein the support assemblies (2) comprise a support (21), two jacks (22) are fixed on the support (21), the two jacks (22) are symmetrically arranged with respect to the support (21), and a plurality of shim iron groups (23) are installed on the support (21).

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