Multi-point lifting appliance for ultra-large prefabricated concrete column
By designing an ultra-large precast concrete column multi-point lifting sling including main and auxiliary spreaders, the problems of stress cracks and slippage in traditional lifting methods are solved, and efficient and safe multi-point lifting and automatic vertical installation are achieved.
Patent Information
- Application Number
- CN202420899518.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In traditional single-point or two-point lifting methods, super-large precast concrete columns are prone to stress cracks and slippage of wire ropes, resulting in quality problems and safety hazards.
A super-large precast concrete column multi-point lifting sling is designed, including the main and auxiliary lifting slings. Multi-point lifting is achieved through beams, booms and connecting groups (including pulleys and auxiliary wire ropes), and the lifting points are ensured to be consistent with the force of the lifting point through fixed groups and movable lifting lugs.
Through multi-point lifting, the bending moment of the column body is reduced, stress cracks are avoided, and structural quality is ensured. At the same time, the design of pulleys and sub-wire ropes makes the lifting point consistent with the stress, automatically adjusts the vertical installation status of the column, improves the lifting efficiency and avoids the risk of slippage.
Smart Images
Figure CN222974667U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of the construction of water spraying devices for cooling towers in thermal power plants and nuclear power plants. Specifically, it relates to a multi-point lifting sling for super-large precast concrete columns. Background Technique
[0002] In the construction of thermal power plants, the cooling tower is a structure for the cooling function of the generator set. Inside it, a water spraying device is built by components such as precast concrete columns and beams, and water spraying equipment is arranged above. The length of the precast concrete columns of conventional cooling towers is usually between 20m and 10m, the cross-sectional size is between 400mm and 600mm, and the weight is below 20t. After prefabrication, they are transported into the cooling tower, and the installation of the precast columns is completed by the method of single-point bundling lifting or two-point bundling lifting by two cranes. With the application of the "two machines and one tower" design in thermal power plants and the first application in the construction of nuclear power plants in the past two years, super-large cooling towers have increasingly appeared in power construction. The water spraying area of such super-large cooling towers is usually above 20,000 ㎡, the height is above 200m, and the height of the air inlet is also close to 20m. In terms of size, it is more than twice that of traditional cooling towers. The increase in the single-body volume has also brought great technical difficulties to the construction of cooling towers, such as the emergence of super-large precast concrete columns.
[0003] Due to the large self-weight and long length of super-large precast concrete columns, if traditional single-point or two-point lifting is adopted, due to the characteristics of large self-weight of the column body and large span between lifting points, a large bending moment will be generated in the middle of the column, which will exceed the self-resistance moment of the material and stress cracks will appear, resulting in serious quality problems. At the same time, due to the large cross-sectional size and large self-weight of the precast column, wire rope slings will slip off during traditional single-point or two-point bundling lifting, causing safety accidents.
[0004] In view of this, we propose a multi-point lifting sling for super-large precast concrete columns. Content of the Utility Model
[0005] The purpose of the utility model is to provide a multi-point lifting sling for super-large precast concrete columns with a reliable fixing method and capable of meeting multi-point lifting, so as to solve the problems raised in the above background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solution:
[0007] A multi-point lifting sling for super-large precast concrete columns includes a main sling and an auxiliary sling. The main sling includes a cross beam, a suspension rod, and a connection group fixed between the cross beam and the suspension rod. The connection group includes a pulley, and a secondary steel wire rope is slidably connected to the pulley. The two ends of the secondary steel wire rope are respectively connected to the same-side ends of two suspension rods passing through the lifting holes of the concrete column.
[0008] As a further solution of the utility model: the hoisting holes of the concrete column are respectively arranged at equal intervals on the mirror image of the center line of the concrete column. At the same time, the horizontal distance between the centers of the hoisting holes in the horizontal state of the column should be greater than 300 mm, and a number of auxiliary lifting point holes are also provided on the concrete column body.
[0009] As a further solution of the utility model: first fixing groups are provided at both ends of the cross beam. The first fixing group includes a fixed lifting lug with through holes provided at both the upper and lower ends. A large snap ring is fixed in the upper through hole of the fixed lifting lug, and the main steel wire rope passes through the large snap ring and is connected to the hook of the crane.
[0010] As a further solution of the utility model: the connecting group further includes a hook, one end of which is fixed in the lower through hole of the large snap ring, and the other end of the hook is fixed to the pulley.
[0011] As a further solution of the utility model: second fixing groups are provided at both ends of the suspender. The second fixing group includes a movable lifting lug with through holes provided at both the upper and lower ends, and an isolation ring is provided between the movable lifting lug and the concrete column.
[0012] As a further solution of the utility model: the suspender passes through the lower through hole of the movable lifting lug and is limited by the rotation of the nut in a threaded manner. A small snap ring is fixed in the upper through hole of the movable lifting lug, and the auxiliary steel wire rope on the pulley is fixed in the small snap ring.
[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0014] 1. In this multi-point hoisting sling for super-large precast concrete columns, multi-point lifting is realized by using the main sling and the auxiliary sling, so that no large bending moment will be generated at the mid-span of the lifting points of the super-large precast concrete column, thus ensuring that no quality problems such as stress cracks will occur in the structure.
[0015] 2. In this multi-point hoisting sling for super-large precast concrete columns, through scientific and reasonable design, when hoisting the precast concrete column, due to the characteristic that the forces on both sides of the pulley are always the same, the forces on the lifting points are always the same, and the vertical installation state of the column can be automatically adjusted, greatly improving the hoisting efficiency and having stronger practicability.
[0016] 3. In this multi-point hoisting sling for super-large precast concrete columns, the sling and the reserved hoisting holes of the column adopt a reliable threading method, and the anti-slip nuts used for the sling ensure the safety of the column during hoisting, effectively avoiding the safety hazard of slipping when the prior art adopts the bundling method. Description of the drawings
[0017] Figure 1 It is the assembly drawing of this solution;
[0018] Figure 2This is the structure diagram of the main lifting tool for this solution;
[0019] Figure 3 This is the side view of the main lifting tool for this solution;
[0020] Figure 4 This is the schematic diagram of the usage process for this solution.
[0021] The meanings of each label in the figure are as follows:
[0022] 100, main lifting tool; 110, crossbeam; 120, first fixing group; 121, fixed lifting lug; 122, large snap ring; 130, connecting group; 131, hook; 132, pulley; 140, hanging rod; 150, second fixing group; 151, small snap ring; 152, movable lifting lug; 153, isolation ring; 154, nut;
[0023] 200, auxiliary lifting tool. Specific implementation manner
[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0025] As Figure 1 shown, this embodiment provides a multi-point lifting tool for super-large precast concrete columns, including a main lifting tool 100 and an auxiliary lifting tool 200. Considering that during the lifting process of the concrete column, it automatically transforms from a horizontal state to a vertical state. Therefore, the main lifting tool 100 includes a crossbeam 110, a hanging rod 140, and a connecting group 130 fixed between the crossbeam 110 and the hanging rod 140. The connecting group 130 includes a pulley 132. A steel wire rope is slidably connected to the pulley 132. The two ends of the secondary steel wire rope are respectively connected to the same-side ends of two hanging rods 140 passing through the lifting holes of the concrete column;
[0026] Before lifting, after passing the hanging rod 140 through the reserved lifting hole of the concrete column, connect the two ends of the hanging rod 140 to the secondary steel wire rope on the pulley 132. Then install the pulley 132 on the crossbeam 110, fix the main steel wire ropes at both ends of the crossbeam 110 on the hook of the crane. Then pass the steel wire rope through the auxiliary lifting point hole of the concrete column and fix the steel wire rope on the auxiliary lifting tool 200. After that, perform the lifting operation. When lifting, due to the principle that the two ends of the pulley 132 are subjected to the same force, the two ends of the secondary steel wire rope are always evenly stressed to ensure balance. As the lifting height increases, the pulley 132 automatically slides to adjust the state of the precast concrete column to the vertical installation state.
[0027] The improvement of this embodiment lies in: realizing multi-point lifting by using the main lifting device 100 and the auxiliary lifting device 200, so that no large bending moment will be generated at the mid-span of the lifting points of the super-large precast concrete column, thus ensuring that no quality problems such as stress cracks will occur in the structure. During the lifting process, due to the characteristics of the pulley 132, the forces on the lifting points are always consistent, and the vertical installation state of the column can be automatically adjusted, greatly improving the lifting efficiency. By adopting the threading method, the potential safety hazard of slippage when using the bundling method in the prior art is avoided.
[0028] As Figure 2 shown, in order to fix the cross beam 110, the suspension rod 140 and the connection group 130 fixed between the cross beam 110 and the suspension rod 140, therefore, first fixing groups 120 are provided at both ends of the cross beam 110. The first fixing group 120 includes fixed lifting lugs 121 with through holes provided at both the upper and lower ends. A large snap ring 122 is fixed in the upper through hole of the fixed lifting lug 121. The main steel wire rope passes through the large snap ring 122 and is connected to the hook of the crane. The connection group 130 further includes a hook 131. One end of the hook 131 is fixed in the lower through hole of the large snap ring 122, and the other end of the hook 131 is fixed to the pulley 132. Second fixing groups 150 are provided at both ends of the suspension rod 140. The second fixing group 150 includes movable lifting lugs 152 with through holes provided at both the upper and lower ends. A small snap ring 151 is fixed in the upper through hole of the movable lifting lug 152. The secondary steel wire rope on the pulley 132 is fixed in the small snap ring 151.
[0029] Meanwhile, considering the convenience of installing the suspension rod 140 and the movable lifting lug 152 and avoiding the friction between the small snap ring 151 and the column body of the concrete column during the lifting process, therefore, the suspension rod 140 passes through the lower through hole of the movable lifting lug 152 and is limited by the threaded rotation of the nut 154, so as to prevent the movable lifting lug 152 from slipping off the suspension rod 140. At the same time, an isolation ring 153 is provided between the movable lifting lug 152 and the concrete column. The isolation ring 153 is used to isolate the small snap ring 151 to ensure that the upper small snap ring 151 does not rub against or interfere with the column body during the lifting process.
[0030] As Figure 3 shown, in order to avoid interference between the secondary steel wire ropes on both sides of the suspension rod 140 and the suspension rod 140 when the column is lifted, therefore, when installing the positions of the two reserved lifting holes of the suspension rod 140 on the column body, the lifting holes of the concrete column are respectively arranged at equal intervals in the mirror image positions on the center line of the concrete column. At the same time, the horizontal distance between the centers of the lifting holes in the flat state of the column should be greater than 300 mm. A number of auxiliary lifting point holes are also provided on the concrete column body.
[0031] It should be further noted that threads should be provided at both ends of the suspension rod 140 and rotatably fixed to the nut 154 by threading; the number of pulleys 132 is two, and their specifications and models are the same. During hoisting, the forces on both sides of the pulleys 132 are the same, ensuring that the crossbeam 110 is in a flat state; during hoisting, it should be used in conjunction with the auxiliary lifting tool 200 to achieve the purpose of multi-point hoisting. For example, when hoisting a column at four points, the method of double-crane lifting should be selected. The lifting tool serves as the main lifting tool 100 to share the forces at two points, and the other two points use the auxiliary lifting tool 200 to assist in lifting the lifting tool to achieve four-point hoisting, enabling the column to smoothly transition from the horizontal state to the vertical state for installation. Similarly, during three-point hoisting, the other lifting point uses the same method to assist in lifting the lifting tool.
[0032] In summary, the working principle of this solution is as Figure 4 shown:
[0033] The steel wire rope is connected to the large snap ring 122 on the fixed lifting lugs 121 at both ends of the crossbeam 110. One pulley 132 is provided under each fixed lifting lug 121 and is hung on the fixed lifting lug 121 through the hook 131. The pulley 132 is connected to the movable lifting lugs 152 at both ends of the suspension rod 140 through the steel wire rope. The steel wire rope connected to the crossbeam 110 is connected to the crane hook. According to the state before using this lifting tool, remove the nut 154 at one end of the suspension rod 140, take off the movable lifting lug 152 and the spacer ring 153, insert the suspension rod 140 into the reserved hoisting hole in the column body, and then successively install the spacer ring 153, the movable lifting lug 152, and the nut 154. Adjust the nut 154 to make the exposed thread lengths at both ends consistent. There should be a certain gap between the movable lifting lug 152, the nut 154, and the spacer ring 153. After completing the connection with the column and installing the auxiliary lifting tool 200 at two points at the column end, formal hoisting can be carried out. When using double-crane lifting, this lifting tool serves as the main hoist to undertake the hoisting and installation work of the entire column. The auxiliary lifting tool 200 is the secondary hoist, which only assists the column to transition from the horizontal state to the vertical state during hoisting and achieves the purpose of multi-point hoisting. After the column is erected, disassemble the auxiliary lifting tool 200. After the column is installed and fixed in place, remove the nut 154, the movable lifting lug 152, and the spacer ring 153 at one end of the suspension rod 140, and draw out the suspension rod 140 to prepare for the next column hoisting.
[0034] Although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0035] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application fall within the protection scope of the claims of the present application.
Claims
1. A multi-point lifting sling for super-large precast concrete columns, comprising a main sling (100) and an auxiliary sling (200), characterized in that: The main hoist (100) includes a cross beam (110), a suspension rod (140) and a connection group (130) fixed between the cross beam (110) and the suspension rod (140), the connection group (130) includes a pulley (132), and a secondary steel wire rope is slidably connected to the pulley (132), wherein both ends of the secondary steel wire rope are respectively connected to the same side ends of two suspension rods (140) that penetrate through the concrete column lifting holes.
2. The multi-point lifting device for super-large precast concrete columns according to claim 1 is characterized in that: The concrete column hanging holes are arranged at equidistant positions on the mirror image of the concrete column center line. At the same time, the horizontal spacing between the hanging holes should be greater than 300mm when the column is laid flat. A number of auxiliary hanging point holes are also provided on the concrete column.
3. The multi-point lifting device for super-large precast concrete columns according to claim 1 is characterized in that: A first fixing group (120) is provided at both ends of the crossbeam (110), and the first fixing group (120) includes a fixed lifting ear (121) with through holes at both ends, wherein a large clamping ring (122) is fixed in the through hole at the upper end of the fixed lifting ear (121), and the main steel wire rope passes through the large clamping ring (122) and is connected to the hook of the crane.
4. The multi-point lifting device for super-large precast concrete columns according to claim 3 is characterized in that: The connection group (130) further comprises a hook (131), wherein one end of the hook (131) is fixed in a through hole at the lower end of the large clamping ring (122), and the other end of the hook (131) is fixed to the pulley (132).
5. The multi-point lifting device for super-large precast concrete columns according to claim 1 is characterized in that: The two ends of the suspension rod (140) are provided with a second fixing group (150), the second fixing group (150) includes a movable lifting ear (152) with through holes at both ends, and an isolation ring (153) is provided between the movable lifting ear (152) and the concrete column.
6. The multi-point lifting device for super-large precast concrete columns according to claim 5 is characterized in that: The suspension rod (140) passes through the lower through hole of the movable lifting ear (152) and is threadedly rotated and limited by a nut (154); a small snap ring (151) is fixed to the upper through hole of the movable lifting ear (152); and the auxiliary steel wire rope on the pulley (132) is fixed in the small snap ring (151).