A lifting lug structure for hoisting a thin-walled circular tube tower module

Abstract

The present invention belongs to the technical field of hoisting and erection, and discloses a lug structure for hoisting thin-walled circular tube tower modules. Each tower module includes a plurality of main lugs and at least one tailing lug; the main lugs are arranged inside each column at the top platform node of the tower module, and the center lines of the plurality of main lugs intersect at the geometric center point on the horizontal plane of the tower module; the tailing lugs are arranged outside the columns at the bottom platform node of each tower module; each main lug includes a lug main board, a first stiffening plate, a lug reinforcing plate, a second stiffening plate, a third stiffening plate, and a cover plate; the tailing lug includes a backing plate, a lug pipe shaft, a cross stiffening plate, and a lug outer retaining ring. On the premise of ensuring the hoisting strength and the overall stability of the tower module, the present invention can facilitate the operability and safety of operators in a narrow area at ultra-high altitude, is conducive to the installation and disassembly of hoisting rigging, can meet the verticality of the tower module after being erected upright, and thus reduces the high-altitude operation time.

Description

Technical Field

[0001] The present invention belongs to the technical field of hoisting, and specifically relates to a lifting lug structure for hoisting thin-walled circular tube tower modules. Background Art

[0002] A thin-walled circular tube tower module refers to a tower structure assembled by thin-walled high-quality carbon steel pipes or thin-walled alloy steel pipes, flanges, and bolts. There are multiple transverse branch pipes and diagonal bracing branch pipes at the nodes of large thin-walled circular tube tower modules, and the node branch pipes are connected into one body by node rib plates.

[0003] A tall flare tower is generally assembled by several tower modules. The designed height of a tall thin-walled circular tube flare tower has reached more than 150m. Generally, the flare tower parts are transported to the flare tower installation site. The tower base section components are directly assembled on the tower base, and the remaining flare tower components are assembled into several tower modules on the ground. In order to reduce the safety risks of high-altitude operations, improve the assembly work efficiency of tower modules, and save the hoisting construction period and usage cost of hoisting machinery, the construction process of lying assembly into multiple tower modules and centralized hoisting operations is often adopted. Therefore, it is very important to select appropriate lifting points and lifting lug structures for flare tower modules.

[0004] A lifting lug is a component welded to equipment for fixing lifting ropes, hooks, etc. used by lifting equipment. However, existing lifting lugs basically cannot meet the hoisting requirements of thin-walled circular tube tower modules. In the "HG / T 21574 Design and Selection Specification for Lifting Lugs of Chemical Equipment", the maximum nominal lifting weight of the TP type top plate lifting lug is 15 tons, which cannot meet the hoisting requirements of thin-walled circular tube tower modules; the AP type tail plate lifting lug is arranged between the equipment foundation ring plate and the cover plate, and the complex structure at the nodes of thin-walled circular tube tower modules cannot meet the design requirements of the lifting lug; the structure of the SP type side wall plate lifting lug cannot be applied to the complex structure at the nodes of thin-walled circular tube tower modules. In the "HG / T 21574 Design and Selection Specification for Lifting Lugs of Chemical Equipment", the maximum nominal lifting weight of the AX series pipe shaft type lifting lug on a cylinder with a nominal diameter of 600mm to 750mm is 17.5 tons, which cannot meet the hoisting requirements of a large thin-walled circular tube tower module with a net weight of 140 tons.

[0005] The hoisting of existing thin-walled circular tube tower modules generally uses a large main crane to hoist the upper lifting lug of the tower module and a tailing crane to lift the tail lifting lug of the tower module. The two-crane lifting method is used to complete the process of the tower module from the lying state to the upright state, and then a single main crane hoists the tower module into place. The disadvantage of the modular hoisting of large thin-walled circular tube towers is that the design of the lifting lug must meet the strength requirements and hoisting process requirements of the thin-walled circular tube tower module, and the production and welding of the lifting lug for hoisting are completed at the manufacturing plant. Summary of the Invention

[0006] The present invention focuses on solving the hoisting problem of thin-walled circular tube tower modules, and proposes a lug structure for hoisting thin-walled circular tube tower modules. On the premise of ensuring the hoisting strength and the overall stability of the tower module, this hoisting point structure facilitates the operability and safety of operators in a narrow area at ultra-high altitude as much as possible, thereby reducing the high-altitude operation time and shortening the hoisting period of the flare tower module.

[0007] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0008] A lug structure for hoisting thin-walled circular tube tower modules, each tower module includes a plurality of main lugs and at least one trailing lug; the main lugs are arranged on the inner sides of the columns at the top platform nodes of the tower module, and the center lines of the plurality of main lugs intersect at the geometric center point on the horizontal plane of the tower module; the trailing lugs are arranged on the outer sides of the columns at the bottom platform nodes of each tower module;

[0009] Each of the main lugs includes a lug main board welded to the column at the root, and the distance from the center line of the lug main board to two adjacent diagonal branch pipes is equal; the lug hole of the lug main board is arranged at the upper part of the lug main board, and two first rib plates symmetrically welded on both sides of the lug main board are arranged above the lug hole, and both of the two first rib plates are perpendicular to the lug main board; two lug reinforcement plates are arranged at the lug hole of the lug main board, and the two lug reinforcement plates are respectively welded to both sides of the lug main board; two second rib plates symmetrically arranged on both sides of the lug main board are arranged below the lug hole of the lug main board, the second rib plates are welded to the column at their roots and are parallel to the lug main board; a third rib plate is arranged at the bottom end of the lug main board, and the third rib plate is welded to the lug main board and the diagonal branch pipe; a cover plate is jointly welded at the tops of the lug main board and the second rib plate, and the cover plate forms a box structure with the lug main board and the second rib plate 104.

[0010] Furthermore, the trailing lug includes a backing plate wrapped around the column at the trailing hoisting point, two lug pipe shafts are symmetrically welded on both sides of the backing plate, and the axes of the two lug pipe shafts are parallel to the ground; a cross rib plate or a grid rib plate is arranged inside each of the lug pipe shafts, and the cross rib plate or the grid rib plate is welded to the backing plate; a lug outer retaining ring is welded at the outer end of the lug pipe shaft.

[0011] Furthermore, the bottom end of the lug main board extends between two diagonal branch pipes at the top platform node of the tower module.

[0012] Furthermore, the lug hole of the lug main board is 1-1.3 m higher than the axis of the horizontal branch pipe of the top platform of the tower module.

[0013] Furthermore, the second rib plate extends from a position below the lug reinforcing plate to the diagonal branch pipe at the top platform node of the tower module in the length direction, and the bottom ends of the two second rib plates are respectively welded to the two diagonal branch pipes.

[0014] Furthermore, the cover plate extends at least from the upper end of the second rib plate to the position where the third rib plate is located in the length direction and covers the second rib plates on both sides in the width direction.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) The lug structure for hoisting the thin-walled circular tube tower module of the present invention is conducive to the setting of hoisting rigging, can meet the verticality after the tower module is erected, make the lower end faces of the columns in a horizontal plane, and ensure the overall stability and hoisting strength of the tower module.

[0017] (2) The lug structure for hoisting the thin-walled circular tube tower module of the present invention is convenient for removing the rigging, and improves the operability and safety of the operators in the narrow area at ultra-high altitude.

[0018] (3) The lug structure for hoisting the thin-walled circular tube tower module of the present invention can shorten the hoisting construction period, save the usage cost of large cranes, reduce the cooperation cost of small cranes and labor costs, and has obvious economic benefits. Description of the Drawings

[0019] Figure 1 is the position diagram of the lug structure for hoisting the thin-walled circular tube tower module provided by the present invention;

[0020] Figure 2 is the orientation diagram of the lug structure for hoisting the thin-walled circular tube tower module provided by the present invention;

[0021] Figure 3 is the structural schematic diagram of the main lug in the lug structure for hoisting the thin-walled circular tube tower module provided by the present invention;

[0022] Figure 4 is Figure 3 the A-A cross-sectional view of

[0023] Figure 5 is Figure 3 the B-B cross-sectional view of

[0024] Figure 6 is Figure 3 the C-C cross-sectional view of

[0025] Figure 7 is the structural schematic diagram of the tail lug in the lug structure for hoisting the thin-walled circular tube tower module provided by the present invention;

[0026] Figure 8 isFigure 7 D-D sectional view.

[0027] In the above figures: 1 - main lifting lug, 101 - main plate of the lifting lug, 102 - first rib plate, 103 - reinforcing plate of the lifting lug, 104 - second rib plate, 105 - third rib plate, 106 - cover plate; 2 - trailing-end lifting lug, 201 - backing plate, 202 - pipe shaft of the lifting lug, 203 - cross rib plate, 204 - outer retaining ring of the lifting lug; 3 - column; 4 - diagonal branch pipe; 5 - horizontal branch pipe. Detailed implementation mode

[0028] In order to further understand the content, characteristics and effects of the present invention, the following embodiments are cited and described in detail in conjunction with the accompanying drawings as follows:

[0029] As Figures 1 to 2 shown, this embodiment provides a lifting lug structure for hoisting thin-walled circular tube tower module, and each tower module includes a plurality of main lifting lugs 1 and a trailing-end lifting lug 2. The main lifting lugs 1 are arranged inside each column 3 at the top platform node of the tower module, and the center lines of the plurality of main lifting lugs 1 intersect at the geometric center point on the horizontal plane of the tower module. The trailing-end lifting lug 2 is arranged outside the column 3 at the elevation position of the bottom platform node of each tower module.

[0030] As Figures 3 to 6 shown, each main lifting lug 1 includes a main plate 101 of the lifting lug, two first rib plates 102, two reinforcing plates 103 of the lifting lug, two second rib plates 104, one third rib plate 105 and one cover plate 106.

[0031] The main plate 101 of the lifting lug is directly welded to the inner wall of the column 3 at its root to bear the pulling force of the steel wire rope; the distance from the center line of the main plate 101 of the lifting lug to two adjacent diagonal branch pipes 4 is equal. The bottom end of the main plate 101 of the lifting lug extends between the two diagonal branch pipes 4 at the top platform node of the tower module, and the lifting lug hole of the main plate 101 of the lifting lug is 1 - 1.5 m higher than the axis of the horizontal branch pipe 5 of the top platform of the tower module to facilitate the removal of the hoisting rigging. The center lines of the plurality of main lifting lugs 1 intersect at the geometric center point of the tower module, that is, the center lines of the main plates 101 of the lifting lugs intersect at the same point.

[0032] Two first rib plates 102 are arranged above the lifting lug hole of the main plate 101 of the lifting lug, and the two first rib plates 102 are perpendicular to the main plate 101 of the lifting lug and are symmetrically arranged on both sides of the main plate 101 of the lifting lug. The first rib plate 102 is used to increase the bending section modulus of the main plate 101 of the lifting lug and reduce the tensile stress between the root of the main plate 101 of the lifting lug and the column 3.

[0033] There are two lug reinforcement plates 103 provided at the lug holes of the lug main board 101. The two lug reinforcement plates 103 are respectively welded to both sides of the lug main board 101 in a fitting manner, and through holes with the same diameter as the lug holes of the lug main board 101 are provided. The lug reinforcement plates 103 are used to reduce the tensile stress and shear stress borne by the lug main board 101.

[0034] There are two second rib plates 104 provided below the lug holes of the lug main board 101. The second rib plates 104 are directly welded to the inner wall of the column 3 at their roots; the two second rib plates 104 are symmetrically arranged on both sides of the lug main board 101 and are parallel to the lug main board 101 at a certain distance. The second rib plates 104 extend from the position below the lug reinforcement plates 103 in the length direction to the inclined branch pipe 4 at the top platform node of the tower module, and the bottom ends of the two second rib plates 104 are respectively welded to the two inclined branch pipes 4. The second rib plates 104 are used to increase the bending section modulus of the lug main board 101 and reduce the tensile stress borne by the surface of the thin-walled circular tube column 3.

[0035] There is a third rib plate 105 provided at the bottom end of the lug main board 101. The third rib plate 105 is inclined along the plane formed by the axes of the two inclined branch pipes 4 at the top platform node of the tower module and is welded to both the lug main board 101 and the inclined branch pipe 4. The third rib plate 105 connects the lug main board 101, the second rib plates 104, and the inclined branch pipe 4 into one body, solidifies the structural positions of the column 3 and the inclined branch pipe 4, and reasonably distributes the load borne by the main lug 1.

[0036] A cover plate 106 is jointly welded to the top of the lug main board 101 and the second rib plates 104 on both sides thereof. The cover plate 106 extends at least to the position where the third rib plate 105 is located from the upper ends of the second rib plates 104 in the length direction and covers the second rib plates 104 on both sides in the width direction. The cover plate 106 forms a solid box structure with the lug main board 101 and the second rib plates 104 on both sides thereof, increasing the bending section modulus of the main lug 1.

[0037] The welding sequence of each component in the main lifting lug 1 is as follows: the lug reinforcement plate 103 is welded to the lug main plate 101 → the lug main plate 101 should be first opened with a double-sided 55° groove and welded to the pipe wall of the column 3 → after the bottom edge of the first rib plate 102 and the welding end of the lug main plate 101 are opened with a double-sided 55° groove, it is then welded to the lug main plate 101 and the pipe wall of the column 3 → the third rib plate 105 is welded to the pipe wall of the diagonal branch pipe 4 and the lug main plate 101 → the cover plate 106 is welded to the lug main plate 101 and the third rib plate 105 → after the bottom edge of the second rib plate 104 is opened with a single-sided 55° groove, it is welded to the pipe wall of the column 3, the cover plate 106, and the diagonal branch pipe 4. Appropriate welding processes should be selected during welding, and qualified welders should perform the welding to ensure the welding quality; all welds should be subjected to visual inspection, and there should be no cracks and lack of fusion defects. The welds should be subjected to magnetic particle testing according to the standard NB / T47013.4 - 2015, and the qualification level is Class I; or penetrant testing should be performed according to NB / T47013.5 - 2015, and the qualification level is Class I.

[0038] At the elevation position of the bottom platform node of each tower module, a tailing lifting lug 2 is welded on the outer pipe wall of the column 3. The tailing lifting lug 2 is of the pipe - shaft type, mainly to facilitate the connection of the tailing rigging and the removal of the tailing rigging after the tower module is erected vertically.

[0039] As Figures 7 to 8 shown, the tailing lifting lug 2 includes a backing plate 201, a lug pipe shaft 202, a cross rib plate 203, and a lug outer retaining ring 204. The backing plate 201 is wrapped around the thin - walled circular - tube column 3 to enhance the bending and shear resistance of the column 3 caused by the tension of the tailing lifting lug 2. Two lug pipe shafts 202 are symmetrically welded on both sides of the column 3 on the backing plate 201. The axes of the two lug pipe shafts 202 are parallel to the opposite horizontal branch pipe 5 of the tower module, that is, after the tower module is assembled horizontally, the axes of the two lug pipe shafts 202 are parallel to the ground. The lug pipe shafts 202 symmetrically arranged on both sides of the column 3 distribute the load, meeting the tensile force at the tail during the lifting of the tower. A cross rib plate 203 or a grid rib plate is arranged inside the lug pipe shaft 202, and the cross rib plate 203 or the grid rib plate is welded to the backing plate 201 to increase the bending strength of the lug pipe shaft 202 and reduce the maximum stress borne by the backing plate 201. The outer end of the lug pipe shaft 202 is welded with a lug outer retaining ring 204, and the lug outer retaining ring 204 prevents the tailing rigging from falling off during the hoisting process.

[0040] It can be seen that the lifting lug structure for the thin - walled circular - tube tower module of the present invention, on the premise of ensuring the hoisting strength and the overall stability of the tower module, can facilitate the operability and safety of the operators in the ultra - high - altitude narrow area, is conducive to the installation and disassembly of the hoisting rigging, can meet the verticality of the tower module after it is erected vertically, thereby reducing the high - altitude operation time, shortening the hoisting period of the flare tower module, and reducing the labor and equipment costs.

[0041] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many specific transformations in various forms without departing from the spirit of the invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A lifting lug structure for hoisting a thin-walled circular tube tower module, characterized in that, Each tower module includes a plurality of main lifting lugs and at least one tailing lifting lug; the main lifting lugs are arranged inside each column at the top platform node of the tower module, and the center lines of the plurality of main lifting lugs intersect at the geometric center point on the horizontal plane of the tower module; the tailing lifting lug is arranged outside the column at the bottom platform node of each tower module. Each of the main lifting lugs includes a lug main board welded to the column at the root, and the distance from the center line of the lug main board to two adjacent diagonal branch pipes is equal; the lug hole of the lug main board is arranged at the upper part of the lug main board, and two first rib plates symmetrically welded on both sides of the lug main board are arranged above the lug hole, and both of the two first rib plates are perpendicular to the lug main board; two lug reinforcement plates are arranged at the lug hole of the lug main board, and the two lug reinforcement plates are respectively welded to both sides of the lug main board in a fitting manner; two second rib plates symmetrically arranged on both sides of the lug main board are arranged below the lug hole of the lug main board, and the root of the second rib plate is welded to the column and is parallel to the lug main board; a third rib plate is arranged at the bottom end of the lug main board, and the third rib plate is welded to the lug main board and the diagonal branch pipe. A cover plate is welded to the top of the lug main board and the second rib plate together, and the cover plate forms a box structure with the lug main board and the second rib plate. The tailing lifting lug includes a backing plate wrapped around the column at the tailing lifting point, and two lug pipe shafts are symmetrically welded to both sides of the backing plate on the column, and the axes of the two lug pipe shafts are parallel to the ground.

2. The lug structure for hoisting a thin-walled circular tube tower module according to claim 1, characterized in that, The bottom end of the lug main board extends between two diagonal branch pipes at the top platform node of the tower module.

3. The lug structure for hoisting a thin-walled circular tube tower module according to claim 1, characterized in that, The lug hole of the lug main board is 1 - 1.3 m higher than the axis of the horizontal branch pipe of the top platform of the tower module.

4. The lug structure for hoisting a thin-walled circular tube tower module according to claim 1, characterized in that, The second rib plate extends from the position below the lug reinforcement plate to the diagonal branch pipe at the top platform node of the tower module in the length direction, and the bottom ends of the two second rib plates are respectively welded to the two diagonal branch pipes.

5. The lug structure for hoisting a thin-walled circular tube tower module according to claim 1, wherein, The cover plate extends at least to the position where the third rib plate is located from the upper end of the second rib plate in the length direction and covers the two second rib plates on both sides in the width direction.

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