Balanced hoisting device and method for on-site installation of shield machine

Abstract

The present invention relates to a balanced hoisting device for on-site installation of a shield machine. The device is applied in the technical field of balanced hoisting tooling to solve the technical problem of difficulty in hoisting due to a small wellhead. The device comprises a balance beam, a main lifting lug located above the balance beam, and two sets of movable lifting lugs arranged below the balance beam. Several hoists are suspended from the movable lifting lugs. A connecting seat is fixed to the lower surface of the balance beam, and the movable lifting lugs are slidably connected to the connecting seat. A screw for adjusting the movable lifting lug is provided on the balance beam, and a stopper is welded on the balance beam. The screw passes through the stopper and is threadedly connected to two nuts. The present invention has the effect of efficiently and safely assembling a shield machine trolley.

Description

Technical Field

[0001] The present invention relates to the technical field of shield machine hoisting, and more particularly to a balanced hoisting device and method for on-site installation of a shield machine. Background Art

[0002] The shield machine, often called the underground iron dragon, is a core piece of machinery for tunnel construction. Shield machines come in various sizes depending on the excavation diameter, ranging from small shields of 6 meters to large shields between 14 and 17 meters. Shield machine assembly relies heavily on cranes, and the difficulty of hoisting is significantly affected by site conditions.

[0003] like Figure 13 As shown in the figure, the end view of the hoisting shaft at the construction site shows that the components supporting the shield machine are placed on the trolley, which is used to synchronize with the main machine. Taking a shield machine with an excavation diameter of 14 meters as an example, the trolley width is 11 meters, and the wellhead width is 7 meters. The trolley consists of two side parts, left component 71 and right component 72, and the upper ends of the legs connect the lower platform 73 and upper platform 74 of the two legs. Now, the left component 71, right component 72, lower platform 73, and upper platform 74 need to be assembled to form the appearance inside the shaft.

[0004] The assembly process involves installing the lower platform first, then the left and right legs, and finally the upper platform. However, due to the narrow wellhead width, the left and right legs cannot be hoisted to the designated position. Therefore, a balanced hoisting device and assembly method were designed to address this issue. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, one of the purposes of the present invention is to provide a balanced lifting device for on-site installation of a shield machine. The advantage of the present invention is that the lifting point of the workpiece is indirectly changed through the balance beam, so that the workpiece can be lifted to a specified position when the wellhead is very small, thereby improving the efficiency of assembly.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A balanced lifting device used for on-site installation of a shield machine, comprising a balanced beam, a main lifting lug located above the balanced beam, and two groups of movable lifting lugs stacked below the balanced beam, a number of lifting hoists are hung on the movable lifting lugs, a connecting seat is fixed to the lower surface of the balanced beam, the movable lifting lugs are slidably connected in the connecting seat, a screw for adjusting the movable lifting lug is provided on the balanced beam, a stop block is welded on the balanced beam, the screw passes through the stop block and is threadedly connected to two nuts.

[0007] The above arrangement achieves the following effect: By setting up the balance beam, the workpiece's lifting point and the crane's lifting point are not aligned vertically, thereby changing the workpiece's lifting point, allowing the workpiece to be lifted to the desired location even in small wellheads. The movable lifting lugs are used to adjust the gap size between the left and right components, further accommodating the assembly of shield machines of different sizes.

[0008] Further arrangement: a limit plate is slidingly provided in the connecting seat, the movable lifting ear includes a slide plate and a lifting ring plate, a limit groove and a protrusion that are mutually engaged are provided between the slide plate and the limit plate, and a limit bolt for tightening the limit plate is threadedly connected on the connecting seat; when the movable lifting ear is adjusted to the position, it is locked by the limit plate.

[0009] The effect achieved by the above setting is: due to the difference in weight of the workpiece, when the workpiece and the balance beam are off the ground, the inclination angle of the balance beam is unknown. When the inclination angle of the balance beam exceeds the safety factor of the screw, there is a safety hazard. The raised setting is used to prevent the slide from sliding.

[0010] Further configuration: also includes an adjusting hoist, which is connected to the two lifting components.

[0011] The above setting achieves the following effects: adjusting the hoist to prevent the left and right parts from shaking violently at the moment they leave the ground, thereby avoiding safety hazards and damage to the workpiece; at the same time, cooperating with the lifting hoist, the posture of the workpiece can be quickly adjusted to improve installation efficiency.

[0012] It is further provided that: a driving device for driving the main lifting eye to move is provided on the balance beam, the driving device includes a ring gear and a worm fixed to a base on the balance beam, rotatably provided on the base, the worm and the ring gear are meshed, a transmission gear is meshed inside the ring gear, a rack is slidably provided on the base, the rack is meshed with the transmission gear, the rack is fixedly connected to the main lifting eye, and one end of the worm is provided with a motor for driving the worm to rotate;

[0013] When the motor drives the worm to rotate, it drives the ring gear to rotate, the ring gear drives the driven gear to rotate, and the driven gear drives the rack to move.

[0014] The effect achieved by the above setting is: when the balance beam tilts, the motor can be remotely controlled on the ground or underground to automatically control the position of the main lifting lug, ensuring that the balance beam is in a horizontal state, ensuring the opening size of the left and right components, and being able to dock with the middle component.

[0015] Further configuration: the base includes a bottom plate fixed on the balance beam, a connecting plate connected to the bottom plate by bolts, and a cover fixed to the connecting plate by bolts. A positioning ring protrudes from the lower surface of the ring gear, and the positioning ring is inserted into the connecting plate and the bottom plate. A number of steel balls are provided on the inner side, outer side and bottom surface of the positioning ring and the upper surface of the ring gear, and the steel balls are all rolled on the base.

[0016] The effect achieved by the above setting is: the ring gear itself needs to rotate, and both the inner and outer rings of the ring gear have gear teeth. At this time, the ring gear loses its positioning device and it is difficult to install the bearing parts. At this time, the positioning ring and steel balls are used to make the ring gear suspended in the air while being constrained, ensuring that the entire drive device runs smoother.

[0017] The second object of the present invention is to provide an on-site installation method for a shield machine, which has the advantage of indirectly changing the lifting point of the workpiece through the balance beam, thereby lifting the workpiece to a specified position when the wellhead is very small, thereby improving the assembly efficiency.

[0018] The above technical objectives of the present invention are achieved through the following technical solutions: A shield machine on-site installation method, comprising the following steps:

[0019] 10. Hoist the left and right parts of the shield machine trolley into the well respectively;

[0020] 20. Hoist the middle part of the shield machine's trolley into the well;

[0021] 30. Align the short side of the balance beam with the short side of the wellhead and then rotate it 90 degrees after lowering it into the well. Then connect the hooks of the left and right hoists to the left and right parts respectively.

[0022] 40. Hang the two ends of the regulating hoist on the left and right parts respectively;

[0023] 50. Manually pull the hoist at the same time, and adjust the hoist and the regulating hoist so that the left and right parts are lifted off the ground at the same time and docked with the middle part, and finally fixed with bolts.

[0024] Further configuration: the following steps are further included between steps 40 and 50:

[0025] 41. Adjust the distance between the movable lifting lugs on the left and right sides so that after the left and right parts are off the ground, the distance between them is larger than the structure of the middle part;

[0026] 42. After the hoist is hooked, conduct a trial lift and make fine adjustments to the lifting lugs to ensure that the balance beam is in a horizontal state.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. For working conditions where the wellhead width is smaller than the trolley width, place the components underground in advance, then extend the balance beam so that the lifting point can bypass the interference position of the wellhead and extend to both sides of the well. Then use the hoist to lift the components. In this process, prevent the balance beam from tipping over, and lift both sides symmetrically at the same time, so that the lifting points of the crane and the workpiece are staggered, so that assembly can proceed smoothly.

[0029] 2. Multiple lifting hoists, combined with adjusting hoists and movable lifting eyes, can easily adjust the posture of components, making the bolting process smoother and reducing construction difficulty and safety risks.

[0030] 3. It is suitable for the assembly of all shield machine trolley components and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the embodiment 1 and the workpiece as a whole;

[0032] Figure 2 is a schematic diagram of the three-dimensional structure of Example 1;

[0033] Figure 3 Schematic diagram of the structure of the movable lifting lug according to the first embodiment;

[0034] Figure 4 This is a schematic diagram of the overall structure of Example 2;

[0035] Figure 5 Schematic diagram of the structure of the driving device according to the second embodiment;

[0036] Figure 6 yes Figure 4 Middle AA section view;

[0037] Figure 7 This is a schematic diagram of the structure of step 1 of this embodiment 3;

[0038] Figure 8 This is a schematic diagram of the structure of step 2 of this embodiment 3;

[0039] Figure 9 This is a schematic diagram of the structures of steps 3, 4, and 5 of Example 3;

[0040] Figure 10 This is a schematic diagram of the structure of steps 6 and 7 of Example 3;

[0041] Figure 11 Schematic diagram of the structure of the present embodiment 4;

[0042] Figure 12 Schematic diagram of the structure of the present embodiment 5;

[0043] Figure 13 This is a structural diagram of the underground shield machine trolley after assembly;

[0044] Figure 13 b is a schematic diagram of the existing shield machine trolley assembly interference structure.

[0045] In the figure: 1. Balance beam; 2. Main lifting eye; 3. Moving lifting eye; 31. Lifting eye plate; 32. Slide plate; 33. Connecting seat; 34. Limiting plate; 35. Screw; 36. Stop block; 4. Lifting hoist; 5. Adjusting hoist; 61. Base; 611. Bottom plate; 612. Connecting plate; 613. Sealing cover; 614. Steel ball; 615. Pressure ring; 616. Limiting block; 62. Ring gear; 621. Positioning ring; 63. Worm; 64. Driven gear; 65. Rack; 66. Limiting wheel; 67. Motor; 71. Left component; 72. Right component; 73. Lower platform; 74. Upper platform. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] Example 1:

[0048] refer to Figure 1-3 A balanced lifting device used for on-site installation of a shield machine comprises a balance beam 1, four main lifting lugs 2 located on the upper surface of the balance beam 1, and movable lifting lugs 3 located on the lower surface of the balance beam 1. The movable lifting lugs 3 are divided into two groups, one on the left and one on the right, each of which is hung with a 10-ton or 20-ton manual hoist 4. The main lifting lugs 2 have a span of 6 meters. The balance beam 1 is 6 meters wide and between 11 and 13 meters long. Four hoists 4 are set on each side of the balance beam 1 to adjust the posture of the shield machine components.

[0049] refer to Figure 1-3 A connecting seat 33 is welded to the lower surface of the balance beam 1. The connecting seat 33 corresponds one-to-one with the movable lifting lug 3. The movable lifting lug 3 is slidably set in the connecting seat 33. The movable lifting lug 3 includes two lifting eye plates 31 and a slide plate 32. The two lifting eye plates 31 are welded to the slide plate 32, and the two lifting eye plates 31 are separated by 0.8-1.2 meters. The slide plate 32 is slidably set to the connecting seat 33, and the lifting eye plates 31 protrude downward from the connecting seat 33. A stopper 36 is welded to the balance beam 1, and a screw 35 is welded to the lifting eye plate 31. The screw 35 passes through the stopper 36 and is threadedly connected to two nuts. The nuts are located on both sides of the stopper 36. The movement of the screw 35 is achieved through the two nuts, further driving the movement of the movable lifting lug 3.

[0050] refer to Figure 1-3During the design process of the shield machine's auxiliary equipment, although the frame structure was designed symmetrically, the differences in components and the errors in the position of the lifting lugs resulted in unequal weights on both sides. Consequently, after the balance beam 1 and the workpiece lifted off the ground simultaneously, the balance beam 1 tilted, generating a large horizontal force component and increasing safety risks. This also caused the workpiece's center opening to become smaller, and in severe cases, interfered with the center component, further increasing construction difficulty. Therefore, the movable lifting lug 3 was designed to be movable, used to adjust the size between the left and right components, improving application versatility while also providing a certain leveling capability.

[0051] refer to Figure 1-3 A groove is defined in the center of the connecting base 33, within which a stop plate 34 is positioned. A mating protrusion and stop groove are provided between the slide plate 32 and the stop plate 34. In this embodiment, the protrusion and stop plate 34 are integrally formed, and the cross-section of the protrusion can have a semicircular, rectangular, triangular, or tooth-shaped shape, among others. The stop plate 34 can slide along the width of the slide plate 32. Three stop bolts are threadedly connected to the connecting base 33. To adjust the position of the movable lifting lug 3, the stop bolts are loosened and the nuts are rotated, thereby driving the movable lifting lug 3 within the connecting base 33 via the screw 35.

[0052] refer to Figure 1-3 Because the tilt angle of the balance beam 1 is unknown before lifting, once the tilt angle exceeds the safety factor of the screw 35, there will be a risk of falling objects from a high altitude. The above setting prevents the slide plate 32 from sliding and improves the safety factor.

[0053] refer to Figure 1-3 An adjusting hoist 5 is set between the left and right components. At the beginning, use a ruler to ensure that the spacing between the movable lifting ears 3 is greater than the width of the middle component, and then adjust the hoist 5 to make the components move inward. In this way, the spacing between the left and right components can be controlled by adjusting the hoist 5, which neither interferes with the middle component nor causes the gap to be too large, resulting in insufficient bolt length.

[0054] Example 2, reference Figure 4-6 On the basis of Example 1, the main lifting lug 2 is configured to be adjustable, further solving problems such as the tilt of the balance beam 1 and the weight inconsistency of the components on both sides. The balance beam 1 is provided with a driving device for driving the main lifting lug 2 to move. The driving device includes a base 61 fixed to the balance beam 1, a ring gear 62 and a worm 63 rotatably disposed on the base 61. The worm 63 is meshed with the ring gear 62, and a transmission gear is meshed within the ring gear 62. A rack 65 is slidably disposed on the base 61, meshing with the transmission gear. The rack 65 is fixedly connected to the main lifting lug 2. One end of the worm 63 is provided with a motor 67 for driving the worm 63 to rotate.

[0055] refer to Figure 4-6When the motor 67 drives the worm 63 to rotate, the worm 63 drives the ring gear 62 to rotate. The ring gear 62 rotates and drives the driven gear 64 to rotate. The driven gear 64 drives the rack 65 to move, which in turn drives the main lifting lug 2 to rotate. The above arrangement uses the motor 67 to automatically adjust the position of the balance beam 1, replacing manual adjustment, which is more convenient and efficient.

[0056] refer to Figure 4-6 The transmission ratio of the worm 63 and the ring gear 62 is greater than 40:1, and the transmission ratio of the ring gear 62 and the driven gear 64 is less than 2:1. In this way, the transmission ratio of the turbine and the rack 65 will be greater than 20:1. The motor 67 uses a torque of 100N*M, and finally the push-pull force of the rack 65 is at least 4 tons. The total push-pull force of the four racks 65 is 16 tons. According to the friction coefficient of 0.1, when a component weighing less than 150 tons is hung under the balance beam 1, it can be adjusted. The performance of this drive device is suitable for all currently known large shield trolley components.

[0057] refer to Figure 4-6 The base 61 includes a bottom plate 611 fixed on the balance beam 1, a connecting plate 612 detachably arranged on the bottom plate 611 by bolts, and a cover 613 fixed on the connecting plate 612. The outer side of the ring gear 62 is a turbine tooth structure, and the inner ring is a gear tooth structure. The worm gear 63 is used to generate a large transmission ratio, thereby obtaining a large output force. At the same time, the worm gear 63 is selected to drive the ring gear 62, and the lead angle of the worm gear 63 is less than the equivalent friction angle between the meshing gear teeth, and the whole has a self-locking function.

[0058] refer to Figure 4-6 An annular positioning ring 621 protrudes from the lower surface of the ring gear 62. The positioning ring 621 is inserted into the base plate 611 and the connecting plate 612. Several steel balls 614 are provided on the connecting plate 612 and the base plate 611, located inside, outside, and at the bottom of the positioning ring 621, acting as bearings. Steel balls 614 are also embedded in the upper surface of the ring gear 62. Annular protrusions are provided on both sides of the steel balls 614 for receiving grease. A pressure ring 615 is provided on the inner side of the sealing cover 613. The pressure ring 615 contacts the steel balls 614, and the ring gear 62 is suspended as a whole. The upper and lower steel balls 614 limit the position and reduce friction, making the entire mechanism operate more smoothly and stably.

[0059] refer to Figure 4-6 A rotating shaft is provided on the connecting plate 612, and the driven size is rotatably connected to the rotating shaft. A limiting wheel 66 is provided on the back of the rack 65 for guiding and limiting. A limiting block 616 is fixed on the cover 613 and abuts against the upper surface of the rack 65 to prevent the rack 65 from being skewered up and down.

[0060] The working principle of the above embodiment is as follows: the balance beam 1 is used to make the lifting point of the crane and the lifting point of the workpiece not aligned in the same vertical direction, thereby changing the lifting point of the workpiece and thereby lifting the workpiece to a predetermined position. The relative position of the workpiece can be finely adjusted by the hoisting hoist 4 and the adjusting hoist 5, thereby reducing the difficulty and risk of construction.

[0061] Example 3: Reference Figure 7-10 , a shield machine on-site installation method, mainly used for the assembly of the shield machine's rear supporting trolley, the figure shows the shield machine's No. 2 trolley. The specific steps are as follows:

[0062] The first step is to place the left and right components into the well in advance and support them well, and move them as close to the sides as possible during the lowering process.

[0063] The second step is to place the middle component into the well and raise it to ensure that all the trolleys are at the same height.

[0064] The third step is to hang the hoist 4 on the mobile lifting lug 3 on the ground, set up 4 hoists 4 on one side, align the width of the balance beam 1 with the width of the wellhead, rotate the balance beam 1 90 degrees after going down the well, and hang the hooks of the hoist 4 on the left and right parts.

[0065] Four hoists 4 are used in conjunction to adjust the posture of the left or right component. Since the precision error of the bolt connection is 1 mm, and the length, width, and height of the shield machine components are all between 2 meters and 18 meters, it is impossible to control the error within 1 mm by lifting. Secondly, since the left and right components are in a suspended state, their posture is very difficult to control. The conventional practice is to weld guide ribs or supports, and then use jacks or hand hoists to slowly adjust them in steps to make the position of the bolt connection surface fit together and the bolt holes aligned. This greatly affects the progress, and the construction is difficult and the risk factor is high. Therefore, when the left component is connected to the right component and the middle component by bolts, the four hoists 4 can be used to adjust the front and rear height and the left and right height of the left or right component so that the bolt holes can be quickly aligned. This reduces the difficulty of assembly to a minimum and further ensures construction safety.

[0066] The fourth step is to connect the two ends of the regulating hoist 5 to the left component and the right component to prevent the left component and the right component from shaking violently at the moment of leaving the ground, thereby avoiding potential safety hazards and damage to the workpiece.

[0067] Step 5: Adjust the position of the movable lifting lugs 3 so that the distance between the movable lifting lugs 3 at both ends is greater than that between the middle parts.

[0068] When the left component and the right component are off the ground, the adjusting hoist 5 is slowly loosened, and the left component and the right component move away from each other. When the left component and the right component move to the extreme positions on both sides, the distance between the left component and the right component is larger than the middle component to avoid interference. When the left component and the right component are hoisted to the specified height, the adjusting hoist 5 is tightened to make the left component and the right component move closer to each other, and the posture is adjusted in conjunction with the lifting hoist 4, so that the left component and the right component can be adjusted into place only by hoisting.

[0069] Step 6. After the left and right components are hung on the hoist 4, a trial lift is performed to check whether the balance beam 1 is in a horizontal state after the left and right components are off the ground. Then, the position of the main lifting lug 2 is further fine-tuned by the drive device to make the balance beam 1 in a horizontal state.

[0070] Due to the density of the left and right parts, the error of the hanging points and the difference in components, there will be certain errors in the weight and center of gravity, which will cause the balance beam 1 to tilt to one end, which will cause a great safety hazard.

[0071] Step 7: After all the work is ready, 8 people are needed to pull the lifting hoist 4 and 1 person is needed to pull the adjusting hoist 5 at the same time, so that the left and right parts are docked with the middle part.

[0072] Example 4, reference Figure 11 The balancing hoisting device described in Example 1 can also be used to assemble trolley No. 1. Taking the upper layer of trolley No. 1 as an example, the left and right components of the upper layer of trolley No. 1 are placed into the well in the same way, and then the balancing beam 1 is placed into the well according to the method of Example 2, and docked with the left and right components of trolley No. 1. The positions of the left and right components of trolley No. 1 are adjusted according to the method of Example 2, and then docked with the lower layer of trolley No. 1.

[0073] Example 5, reference Figure 12 The balancing hoisting device described in Example 1 can also be used to assemble the platform of trolleys 3-5. The same method is used to place the platform underground in advance, and then the balancing beam 1 is placed underground according to the scheme described in Example 2, and docked with the platform. The posture and position of the left and right platforms are adjusted according to the method of Example 2 so that the platform and the main structure of trolleys 3-5 are docked.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A shield machine on-site installation method, characterized by: A balancing hoisting device is used, the balancing hoisting device comprising a balancing beam (1), a main lifting lug (2) located above the balancing beam (1), and two groups of movable lifting lugs (3) located below the balancing beam (1), wherein a plurality of hoists (4) are hung on the movable lifting lugs (3); a connecting seat (33) is fixed to the lower surface of the balancing beam (1); the movable lifting lugs (3) are slidably connected to the connecting seat (33); a screw (35) for adjusting the movable lifting lug (3) is provided on the balancing beam (1); a stopper (36) is welded on the balancing beam (1); the screw (35) passes through the stopper (36) and is threadedly connected to two nuts; The balance beam (1) is provided with a driving device for driving the main lifting lug (2) to move, and the driving device includes a base (61) fixed on the balance beam (1), a ring gear (62) and a worm (63) rotatably arranged on the base (61), the worm (63) and the ring gear (62) are meshed, a transmission gear is meshed inside the ring gear (62), a rack (65) is slidably provided on the base (61), the rack (65) is meshed with the transmission gear, the rack (65) is fixedly connected to the main lifting lug (2), and one end of the worm (63) is provided with a motor (67) for driving the worm (63) to rotate; When the motor (67) drives the worm (63) to rotate, the ring gear (62) is driven to rotate, the ring gear (62) drives the driven gear (64) to rotate, and the driven gear (64) drives the rack (65) to move; The base (61) includes a bottom plate (611) fixed on the balance beam (1), a connecting plate (612) connected to the bottom plate (611) by bolts, and a sealing cover (613) fixed to the connecting plate (612) by bolts. A positioning ring protrudes from the lower surface of the ring gear (62), and the positioning ring is inserted into the connecting plate (612) and the bottom plate (611). A plurality of steel balls (614) are provided on the inner side, outer side and bottom surface of the positioning ring and the upper surface of the ring gear (62). The steel balls (614) are all rolled and arranged on the base (61); The method comprises the following steps:

10. Hoist the left and right parts of the shield machine trolley into the well respectively; 20. Hoist the middle part of the shield machine's trolley into the well; 30. Align the short side of the balance beam (1) with the short side of the wellhead, lower it into the well, and then rotate it 90 degrees. Then, connect the hooks of the left and right hoists to the left and right parts respectively.

40. Hang the two ends of the regulating hoist (5) on the left and right components respectively; 50. Manually pull the lifting hoist (4) at the same time, and adjust the lifting hoist (4) and the adjusting hoist (5) so that the left and right parts are lifted off the ground at the same time and docked with the middle part, and finally fixed with bolts; The following steps are further included between steps 40 and 50:

41. Adjust the distance between the movable lifting ears (3) on the left and right sides so that after the left and right parts are off the ground, the distance between them is larger than the structure of the middle part; 42. After the hoist (4) is hooked, a trial lift is performed by fine-tuning the lifting lug (3) so that the balance beam (1) is in a horizontal state.

2. The shield machine on-site installation method according to claim 1, characterized in that: A limiting plate (34) is slidably provided in the connecting seat (33), and the movable lifting ear (3) includes a slide plate (32) and a ring plate (31), and a limiting groove and a protrusion that are mutually engaged are provided between the slide plate (32) and the limiting plate (34), and a limiting bolt for tightening the limiting plate (34) is threadedly connected to the connecting seat (33); when the movable lifting ear (3) is adjusted to a position, it is locked by the limiting plate (34).

3. The shield machine on-site installation method according to claim 1, characterized in that: It also includes an adjusting hoist (5), which is connected to the two lifting components.

Images