A lifting method
By adopting the dual crane collaborative lifting method during the lifting of bridge steel components and using multiple lifting lugs, the high cost problem caused by the excessive working radius of the crane when the ultra-long components cross obstacles is solved, and the stability and safety are improved.
Patent Information
- Application Number
- CN202111479279.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-06
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2041-12-06
AI Technical Summary
During the lifting of bridge steel components, when the extra-long components cross obstacles, the crane's working radius is too large, resulting in high costs, and the prior art cannot effectively solve it.
The dual crane collaborative lifting method is adopted. By arranging cranes on both sides of the obstacles and setting multiple lifting lugs on the steel beam members, the first crane and the second crane cooperate with each other to reduce the crane working radius, reduce the crane specification requirements, and save costs.
Effectively reduce the working radius of the crane, reduce the cost of the crane, improve the stability and safety of the lifting process, and reduce the risk of collision between steel beam components and other buildings.
Smart Images
Figure CN114368695B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hoisting methods, in particular to a hoisting method. Background Art
[0002] Current municipal and highway bridges often need to cross over surface or underground obstacles. These include crossing existing rivers, highways, sedimentation tanks, shallow underground pipelines, military cables, and passing under overhead high-voltage cables and existing bridges. In situations where obstacles are crossed, such as rivers with high water flow during the rainy season, highways with extremely heavy traffic, sedimentation tanks that cannot be interrupted, and pipelines and military cables that cannot be relocated or are difficult to reinforce, temporary supports cannot be erected above the obstacles due to various operational requirements. Consequently, extremely long steel beams must be hoisted in one go to cross the obstacles. The length of the hoisted steel beams often exceeds 30 meters, and in some cases even exceeds 40 meters.
[0003] The weight of extra-long bridge steel components often exceeds 100 tons, and since cranes cannot enter the range of obstacles, they can only perform lifting on both sides of the obstacles, resulting in an excessively large working radius of the crane and extremely high lifting costs. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a lifting method to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.
[0005] The solution of the present invention to solve its technical problems is:
[0006] A hoisting method comprises the following steps:
[0007] Step a: Arrange a first crane and a second crane on both sides of the obstacle respectively, arrange steel beam components within the lifting working radius of the first crane, set a first temporary support frame between the first crane and the obstacle, and set a second temporary support frame between the second crane and the obstacle;
[0008] Step b: Arrange the position and number of lifting lugs according to the center of gravity of the steel beam component, set a first set of lifting lugs in the middle of the steel beam component near the center of gravity, and set a second set of lifting lugs at both ends of the steel beam component symmetrically at the center of gravity;
[0009] Step c: The first crane uses the first set of lifting lugs to lift the steel beam component, gradually bringing the steel beam component closer to the second crane until the first crane moves horizontally to its maximum working radius, so that the steel beam component is temporarily placed on the first temporary support frame;
[0010] Step d: The second crane is fastened to one of the second sets of lifting lugs, the first crane is separated from the first set of lifting lugs, and the first crane is fastened to the other second set of lifting lugs;
[0011] Step e: The first crane and the second crane synchronously lift the steel beam component until both ends of the steel beam component are respectively positioned on the first temporary support frame and the second temporary support frame.
[0012] By cooperating with each other, the first crane and the second crane are combined with the pre-set first set of lifting eyes and the second set of lifting eyes to carry out the conversion of the lifting system, that is, from complete lifting by the first crane to synchronous lifting by the first crane and the second crane, the working radius of the crane is reduced by half, and the specifications of the selected crane are greatly reduced, saving a lot of crane costs; since the steel beam component needs to cross the obstacle, it is more reasonable to arrange the first crane and the second crane on both sides of the obstacle respectively; when the lifting system is converted, the first temporary support frame is mainly used to support the steel beam component, and when the final lifting is in place, the first temporary support frame and the second temporary support frame support the steel beam component across the obstacle; in order to select a first crane with a smaller maximum radius value as much as possible to control the lifting cost, when the first crane is translated to its own maximum working radius and the steel beam component is temporarily in place, the second crane can complete the connection with one of the second sets of lifting eyes.
[0013] As a further improvement of the above technical solution, in step b, the first set of lifting lugs is located on the top surface of the steel beam component, and the first set of lifting lugs has four lifting points. The intersection of the two diagonals of the rectangle formed by the four lifting points coincides with the center of gravity of the steel beam component.
[0014] The first set of lifting lugs is located at the center of gravity of the steel beam component. When the first crane lifts the steel beam component alone, the lifting balance is ensured. In addition, the first set of lifting lugs has four lifting points and is relatively stable.
[0015] As a further improvement of the above technical solution, in step b, the two second sets of lifting lugs are both located on the top surface of the steel beam component, the two second sets of lifting lugs are arranged opposite each other, the two second sets of lifting lugs respectively have two lifting points, and the two lifting points of the same set of second set of lifting lugs are arranged opposite each other.
[0016] The two second sets of lifting eyes are mainly used for the conversion of the lifting system. Therefore, the two second sets of lifting eyes are arranged opposite to each other to improve the balance during lifting; the second set of lifting eyes are located on the top surface of the steel beam component, which is convenient for the first crane and the second crane to be connected to the two second sets of lifting eyes respectively; the same set of second set of lifting eyes has two lifting points, which makes the connection more stable, and the two lifting points of the same set of second set of lifting eyes are arranged opposite to each other, which is conducive to maintaining the balance of lifting.
[0017] As a further improvement of the above technical solution, in step c, the first crane lifts the steel beam component so that the bottom elevation of the steel beam component exceeds the top elevation of the first temporary support frame by 10-20 cm.
[0018] Since the steel beam component itself is large in size and weight, it is necessary to control the distance between the steel beam component and the first temporary support frame to reduce collisions during movement.
[0019] As a further improvement of the above technical solution, in step c, after the steel beam component is temporarily placed, the first crane is not completely unloaded and holds more than 80% of the load.
[0020] After the steel beam component is temporarily placed in place, it needs to hold a load of more than 80% to ensure that the position of the steel beam component placed on the first temporary support frame remains unchanged, so that the steel beam component can be placed more firmly on the first temporary support frame when the subsequent lifting system is converted.
[0021] As a further improvement of the above technical solution, in step c, the movement direction of the first crane approaching the second crane is taken as the forward direction, and the position of the first temporary support frame is behind the center of gravity of the steel beam component.
[0022] The second crane needs to be connected to the second set of lifting lugs located at the front end of the steel beam component. When the temporary landing position of the steel beam component is behind the center of the steel beam component, the first temporary support frame can provide a suitable temporary landing point for the steel beam component to prevent the steel beam component from tipping over to the rear.
[0023] As a further improvement of the above technical solution, in step d, after the second crane is coupled, the second crane is gradually loaded, and at the same time, the first crane is gradually unloaded until the first crane is completely unloaded, and the first crane is separated from the first set of lifting eyes. When the first crane is coupled with another second set of lifting eyes, the first crane is gradually loaded until the loads of the first crane and the second crane are the same.
[0024] Since the first crane needs to be transferred from the first set of lifting eyes to the second set of lifting eyes, the first crane needs to be completely unloaded to complete the transfer. In order to improve the stability of the steel beam component placed on the first temporary support frame, the first crane is gradually unloaded while the second crane is required to be gradually loaded to ensure the balance of the steel beam component; and after the first crane and the other second set of lifting eyes are buckled, the first crane is gradually loaded to the same load as the second crane, so that the first crane and the second crane can subsequently lift the steel beam component at the same time.
[0025] As a further improvement of the above technical solution, in step e, the first crane and the second crane synchronously lift the steel beam component so that the bottom elevation of the steel beam component exceeds the top elevation of the first temporary support frame and the top elevation of the second temporary support frame by 20-50 cm.
[0026] When the first crane and the second crane lift the steel beam component synchronously, the steel beam component needs to cross the obstacle, so the bottom elevation of the steel beam component exceeds the top elevation of the first temporary support frame and the top elevation of the second temporary support frame by 20-50 cm, reducing the collision of the steel beam component with other buildings and improving the safety of lifting the steel beam component. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.
[0028] Figure 1 It is the plan layout of the hoisting site of the present invention;
[0029] Figure 2 This is a diagram of the lifting working condition of the steel beam component of the present invention;
[0030] Figure 3 This is a diagram of the rotation and lifting working condition of the steel beam component of the present invention;
[0031] Figure 4 This is a temporary working condition diagram of the steel beam component of the present invention;
[0032] Figure 5 This is a working diagram of the final position of the steel beam component of the present invention;
[0033] Figure 6 This is another working diagram of the temporary placement of the steel beam member of the present invention;
[0034] Figure 7 This is a diagram of the second crane loading and first crane unloading operating conditions of the present invention;
[0035] Figure 8 This is a diagram of the conversion working condition of the hoisting system of the present invention.
[0036] In the figure, 1, first crane; 2, second crane; 3, steel beam member; 31, first set of lifting lugs; 32, second set of lifting lugs; 4, first temporary support frame; 5, second temporary support frame. DETAILED DESCRIPTION
[0037] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interactively without conflicting with each other.
[0038] Reference Figures 1 to 8 , is a hoisting method of the present invention, comprising the following steps:
[0039] Step a: Arrange the first crane 1 and the second crane 2 on both sides of the obstacle, arrange the steel beam component 3 within the lifting working radius of the first crane 1, set a first temporary support frame 4 between the first crane 1 and the obstacle, and set a second temporary support frame 5 between the second crane 2 and the obstacle; specifically, determine the layout of the lifting site according to factors such as the actual site conditions of the lifting site, the external dimensions and total amount of the steel beam component 3, including the positions of the first crane 1 and the second crane 2, the position of on-site assembly of the steel beam component 3, and determine the types of the first crane 1 and the second crane 2; the first temporary support frame 4 and the second temporary support frame 5 can specifically be temporary supports set on permanent bridge piers or temporary supports.
[0040] Step b: Arrange the position and number of the lifting ears according to the center of gravity of the steel beam component 3, set a first set of lifting ears 31 in the middle of the steel beam component 3 near the center of gravity, and set a second set of lifting ears 32 at both side ends of the steel beam component 3 symmetrically to the center of gravity; specifically, the first set of lifting ears 31 is located on the top surface of the steel beam component 3, and the first set of lifting ears 31 has four lifting points, and the intersection of the two diagonals of the rectangle formed by the four lifting points coincides with the center of gravity of the steel beam component 3; the two second sets of lifting ears 32 are both located on the top surface of the steel beam component 3, and the two second sets of lifting ears 32 are arranged opposite to each other, and the two second sets of lifting ears 32 respectively have two lifting points, and the two lifting points of the same set of second set of lifting ears 32 are arranged opposite to each other.
[0041] Step c: The first crane 1 uses the first set of lifting lugs 31 to lift the steel beam component 3. During this process, the first crane 1 gradually approaches the second crane 2 by means of operations such as rotating arms and lying rods, until the first crane 1 is translated to its own maximum working radius, and slowly lowers the steel beam component 3, so that the steel beam component 3 is temporarily located on the first temporary support frame 4; specifically, the first crane 1 lifts the steel beam component 3 and slowly lifts the steel beam component 3 so that the bottom elevation of the steel beam component 3 exceeds the top elevation of the first temporary support frame 4 by 10-20 cm; after the steel beam component 3 is temporarily located, the first crane 1 is not completely unloaded, and the first crane 1 holds more than 80% of the load; with the movement direction of the first crane 1 approaching the second crane 2 as the forward direction, the position of the first temporary support frame 4 is behind the center of gravity of the steel beam component 3.
[0042] Step d: The second crane 2 is buckled to one of the second sets of lifting ears 32, and the first crane 1 and the second crane 2 cooperate with each other to separate the first crane 1 and the first set of lifting ears 31, and the first crane 1 is buckled to the other second set of lifting ears 32; specifically, after the second crane 2 is buckled, the second crane 2 is gradually loaded, and at the same time, the first crane 1 is gradually unloaded until the first crane 1 is completely unloaded, and the first crane 1 is separated from the first set of lifting ears 31. When the first crane 1 is buckled to the other second set of lifting ears, the first crane 1 is gradually loaded until the loads of the first crane 1 and the second crane 2 are the same; during the loading and unloading process of the first crane 1 and the second crane 2, the steel beam component 3 should remain static and stable without rotation, shaking, displacement, etc.
[0043] Step e: The first crane 1 and the second crane 2 synchronously lift the steel beam component 3 until the two ends of the steel beam component 3 are respectively located on the first temporary support frame 4 and the second temporary support frame 5. Specifically, the first crane 1 and the second crane 2 synchronously lift the steel beam component 3 so that the bottom elevation of the steel beam component 3 exceeds the top elevation of the first temporary support frame 4 and the top elevation of the second temporary support frame 5 by 20-50 cm; a trial lifting is required before the first crane 1 and the second crane 2 synchronously lift.
[0044] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A hoisting method, characterized in that: The following steps are involved: Step a: Arrange a first crane (1) and a second crane (2) on both sides of the obstacle, arrange a steel beam component (3) within the lifting working radius of the first crane (1), set a first temporary support frame (4) between the first crane (1) and the obstacle, and set a second temporary support frame (5) between the second crane (2) and the obstacle; Step b: Arrange the position and number of lifting lugs according to the center of gravity of the steel beam component (3), set a first set of lifting lugs (31) in the middle of the steel beam component (3) near the center of gravity, and set a second set of lifting lugs (32) at the ends of both sides of the steel beam component (3) symmetrically to the center of gravity; Step c: The first crane (1) uses the first set of lifting lugs (3 1) lifting the steel beam component (3) so that the steel beam component (3) gradually approaches the second crane (2) until the first crane (1) is translated to its own limit working radius, so that the steel beam component (3) is temporarily located on the first temporary support frame (4); step d: the second crane (2) is buckled to one of the second set of lifting lugs (32), so that the first crane (1) and the first set of lifting lugs (31) are separated, and the first crane (1) is buckled to the other second set of lifting lugs (32); step e: the first crane (1) and the second crane (2) synchronously lift the steel beam component (3) until both ends of the steel beam component (3) are respectively located on the first temporary support frame (4) and the second temporary support frame (5); In step c, the first crane (1) lifts the steel beam component (3) so that the bottom elevation of the steel beam component (3) exceeds the top elevation of the first temporary support frame (4) by 10-20 cm; In step c, after the steel beam component (3) is temporarily placed, the first crane (1) is not completely unloaded, and the first crane (1) holds more than 80% of the load; In step c, the movement direction of the first crane (1) approaching the second crane (2) is taken as the forward direction, and the position of the first temporary support frame (4) is behind the center of gravity of the steel beam component (3); In step d, after the second crane (2) is coupled, the second crane (2) is gradually loaded, and at the same time, the first crane (1) is gradually unloaded until the first crane (1) is completely unloaded, and the first crane (1) is separated from the first set of lifting lugs (31). When the first crane (1) is coupled with another second set of lifting lugs (32), the first crane (1) is gradually loaded until the loads of the first crane (1) and the second crane (2) are the same.
2. A hoisting method according to claim 1, characterized in that: In step b, a first set of lifting lugs (31) is located on the top surface of the steel beam component (3), and the first set of lifting lugs (31) has four rectangular lifting points, and the intersection point of two diagonals of the rectangle formed by connecting the four lifting points coincides with the center of gravity of the steel beam component (3).
3. A hoisting method according to claim 1, characterized in that: In step b, the two second sets of lifting lugs (32) are both located on the top surface of the steel beam component (3), the two second sets of lifting lugs (32) are arranged opposite each other, the two second sets of lifting lugs (32) respectively have two lifting points, and the two lifting points of the same second set of lifting lugs (32) are arranged opposite each other.
4. A hoisting method according to claim 1, characterized in that: In step e, the first crane (1) and the second crane (2) synchronously lift the steel beam component (3) so that the bottom elevation of the steel beam component (3) exceeds the top elevation of the first temporary support frame (4) and the top elevation of the second temporary support frame (5) by 20-50 cm.
Citation Information
Patent Citations
Construction method for hanging wide span arcuated open-web beam
CN101324146A