Back pull lifting bracket and construction method thereof

Abstract

The present application relates to a kind of back pull lifting support and its construction method, the steel structure assembly technical field belongs to, including truss structure, the side of the truss structure is equipped with lifting tool, the rear end of the lifting tool is equipped with back pull tool.The lifting tool includes lifting platform, the front side of the upper end of the lifting platform is equipped with several hydraulic lifters, the hydraulic lifter is equipped with lifting steel strand between truss structure.The present application has the advantages of compact structure, convenient operation and good running stability.The present application solves the problem that the horizontal displacement is too large when lifting on one side, additional bending moment is generated, and the safety and stability of the lifting support are affected.The back pull steel strand is dynamically tensioned and adjusted by back pull lifter and tensioner in real time, to ensure the safety and stability of the structure column and net rack lifting process, and to ensure the lifting precision of truss structure.

Description

Technical Field

[0001] This invention relates to the field of steel structure assembly technology, specifically to a back-pull lifting bracket and its construction method. Background Technology

[0002] Conventional lifting methods rely on the rigidity of temporary lifting supports to meet lifting requirements. Symmetrical lifting is more advantageous for lifting supports, as the balanced lifting on both sides allows them to function effectively. However, when using unilateral lifting, the eccentric effect of the lifting load significantly reduces the load-bearing capacity of the lifting supports. Therefore, ensuring structural rigidity requires more expensive measures, which is not economical.

[0003] In current back-pull lifting systems, the back-pull anchor is generally a counterweight. The upper end of the back-pull steel strand is connected to the lifting beam, and the other end is connected to the counterweight. During the lifting process, it is impossible to adjust the tension of the back-pull steel strand in real time. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a back-tensioned lifting support and its construction method, which boasts advantages such as compact structure, convenient operation, and good operational stability. It solves the problem of excessive horizontal displacement caused by unilateral lifting, resulting in additional bending moments that affect the safety and stability of the lifting support. Real-time dynamic tensioning and adjustment of the back-tensioned steel strands through the back-tensioning lifting device and tensioner ensures the safety and stability of the structural columns and space frame during the lifting process, guaranteeing the lifting accuracy of the truss structure.

[0005] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0006] A back-pull lifting support includes a truss structure, with lifting fixtures on the sides of the truss structure and back-pull fixtures at the rear end of the lifting fixtures. The lifting fixtures include a lifting platform, with several hydraulic lifters located at the front upper end of the lifting platform. Lifting steel strands are provided between each hydraulic lifter and the truss structure.

[0007] Preferably, the upper rear end of the lifting platform is provided with an inclined back-pull assembly, and the lower end of the inclined back-pull assembly is provided with an inclined support steel frame.

[0008] Preferably, the inclined back-pull assembly includes an inclined back-pull upper anchor seat bolted to the upper part of the lifting platform, and an inclined back-pull lower anchor seat integrally cast with reinforced concrete on the inclined back-pull support steel frame, with a back-pull steel strand provided between the inclined back-pull upper anchor seat and the inclined back-pull lower anchor seat.

[0009] Preferably, the rear end of the back-pull steel strand is provided with a hydraulic tensioner that is fixedly connected to the inclined back-pull anchor by an insert bolt.

[0010] Preferably, the upper rear end of the lifting platform is provided with a back-pull lifting device, and a vertical back-pull lower anchor is provided below the back-pull lifting device. A back-pull steel strand is provided between the back-pull lifting device and the vertical back-pull lower anchor.

[0011] A construction method for a back-pull lifting support includes the following steps:

[0012] Step 1: Calculate the lifting force of the lifting equipment using the truss structure, perform lifting construction simulation analysis, and determine the lifting reaction force. Connect and fix the hydraulic lifting device on the lifting platform to the lower part of one side of the truss structure via lifting steel strands.

[0013] Step 2: Determine the back tension angle α by determining the anchoring position.

[0014] Step 3: When the site does not meet the minimum setting conditions for angle α, vertical back pull is adopted; the back pull lifter is fastened to the vertical back pull lower anchor through the back pull steel strand, and the vertical back pull lower anchor bears the back pull force.

[0015] Step 4: When the site meets the minimum setting conditions for angle α, use the inclined back tension assembly; tension the back tension steel strand between the upper and lower inclined back tension anchors using a hydraulic tensioner to achieve angle α.

[0016] As a preferred option, the mechanical principle design of the back-pulling tool is as follows:

[0017] F 提 h1=F 水平 H (H is much larger than h1 and h2) (Formula 1);

[0018] F 水平 =F' 水平 (Formula 2);

[0019] F' 水平 =F 背拉 cosα (Formula 3);

[0020] α=arccos(F' 水平 / F 背拉 ) (Formula 4);

[0021] F 斜拉 =(F 提 h1) / (Hcosα) (Formula 5);

[0022] When α = 90°, F' 水平 =F 水平 =0, at this time F 竖拉 =(F 提 h1) / h2.

[0023] F提 The reaction force of the space frame is expressed in kN; F 水平 F' is the horizontal force obtained according to the principle of equivalent bending moment, with units of kN; 水平 F is a horizontal force of equal magnitude but opposite to the horizontal force, with units of kN; 斜拉 F represents the tension force of the steel strand, measured in kN. 竖拉 α is the tension force of the steel strand, in kN; H is the angle between the steel strand and the lifting platform; h1 is the height of the truss structure, in m; and h1 is the distance from the lifting point to the center of the truss structure, in m.

[0024] As a preferred option, in formula 5, F 提 h1 and H are constants; the larger the angle α, the greater the value of F. 斜拉 The larger the value, the more likely it is to be pulled vertically; when α is 90°, vertical back pull is used; when α is less than 90°, oblique back pull is used.

[0025] Preferably, a back-pull lifting device and a hydraulic tensioner are used to tension the vertical or diagonal back-pull steel strands. During tensioning, single steel strands are tensioned sequentially. During the first tensioning, the tension force of the steel strands is gradually increased to 30% of the design value, tensioning is paused, and the tensioned ends are locked. During the second tensioning, the tension force of the steel strands is gradually increased to 50% of the design value, tensioning is paused, and the steel strands are locked, thus completing the pre-tensioning of the steel strands. The back-pull lifting device and the hydraulic tensioner are not removed.

[0026] As a preferred method, during the lifting of the truss structure off the ground, the horizontal displacement and verticality of the truss structure are monitored in real time by a level monitoring instrument on the lifting platform. Based on the monitoring results, the tension of the back tension steel strands is dynamically adjusted using a pre-installed back tension lifting device or hydraulic tensioner. When the horizontal displacement at the lifting end of the truss structure is too large, the tension of the back tension steel strands is increased; when the horizontal displacement at the back tension end is too large, the tension of the back tension steel strands is decreased, achieving dynamic real-time adjustment, ensuring the stability of the original structural columns, improving the efficiency and safety of the truss structure lifting process, reducing horizontal displacement, and further improving the installation accuracy of the truss structure.

[0027] The present invention can achieve the following effects:

[0028] This invention provides a back-tensioned lifting support and its construction method, which, compared with existing technologies, has the advantages of compact structure, convenient operation, and good operational stability. It solves the problem of excessive horizontal displacement caused by unilateral lifting, resulting in additional bending moments that affect the safety and stability of the lifting support. During the truss structure lifting process, the horizontal deformation of the structural columns is monitored in real time using monitoring fixtures. When excessive lateral horizontal displacement of the structural columns is detected, the back-tensioned steel strands are dynamically tensioned and adjusted in real time using the back-tensioning lifting device and tensioner, ensuring the safety and stability of the structural columns and space frame during the lifting process and guaranteeing the lifting accuracy of the truss structure. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is an exploded view of the structure of the present invention.

[0031] Figure 3 This is a schematic diagram of the oblique back-pull assembly of the present invention.

[0032] Figure 4 This is a schematic diagram of the vertical back-pull structure of the present invention.

[0033] Figure 5 This is a schematic diagram of the mechanical principle of the back-pulling tool of the present invention.

[0034] In the diagram: truss structure 1, lifting fixture 2, back tension fixture 3, hydraulic lifter 4, lifting platform 5, inclined back tension assembly 6, inclined tension support steel frame 7, lifting steel strand 8, inclined back tension upper anchor 9, back tension steel strand 10, inclined back tension lower anchor 11, hydraulic tensioner 12, back tension lifter 13, vertical back tension lower anchor 14. Detailed Implementation

[0035] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0036] Example 1: As Figure 1 , Figure 2 and Figure 3 As shown, a back-pull lifting support includes a truss structure 1, a lifting fixture 2 on the side of the truss structure 1, and a back-pull fixture 3 at the rear end of the lifting fixture 2. The lifting fixture 2 includes a lifting platform 5, with several hydraulic lifters 4 on the upper front side of the lifting platform 5. Lifting steel strands 8 are provided between each hydraulic lifter 4 and the truss structure 1. An inclined back-pull assembly 6 is provided at the upper rear end of the lifting platform 5, and an inclined support steel frame 7 is provided at the lower end of the inclined back-pull assembly 6. The inclined back-pull assembly 6 includes an inclined back-pull upper anchor seat 9 bolted to the upper part of the lifting platform 5. An inclined back-pull lower anchor seat 11, integrally cast with reinforced concrete, is provided on the inclined support steel frame 7. A back-pull steel strand 10 is provided between the inclined back-pull upper anchor seat 9 and the inclined back-pull lower anchor seat 11. A hydraulic tensioner 12, bolted to the inclined back-pull lower anchor seat 11, is provided at the rear end of the back-pull steel strand 10.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a construction method for a back-pull lifting support includes the following steps:

[0038] Step 1: Calculate the lifting force of the lifting device 2 through the truss structure 1, perform lifting construction simulation analysis and calculation, and determine the lifting reaction force; connect and fix the hydraulic lifting device 4 on the lifting platform 5 to the lower part of one side of the truss structure 1 through the lifting steel strand 8.

[0039] The mechanical design principle of the back-pulling tool is as follows:

[0040] F 提 h1=F 水平 H (H is much larger than h1 and h2) (Formula 1);

[0041] F 水平 =F' 水平 (Formula 2);

[0042] F' 水平 =F 背拉 cosα (Formula 3);

[0043] α=arccos(F' 水平 / F 背拉 ) (Formula 4);

[0044] F 斜拉 =(F 提 h1) / (Hcosα) (Formula 5);

[0045] When α = 90°, F' 水平 =F 水平 =0, at this time F 竖拉 =(F 提 h1) / h2;

[0046] F 提 The reaction force for the space frame is expressed in kN; F 水平 F' is the horizontal force obtained according to the principle of equivalent bending moment, with units of kN; 水平 F is a horizontal force of equal magnitude but opposite to the horizontal force, with units of kN; 斜拉 F represents the tension force of the steel strand, measured in kN. 竖拉 α is the tension force of the steel strand, in kN; α is the angle between the steel strand and the lifting platform 5; H is the height of the truss structure 1, in m; h1 is the distance from the lifting point to the center of the truss structure 1, in m.

[0047] Step 2: Determine the back tension angle α based on the anchorage position; in Formula 5, F 提 h1 and H are constants; the larger the angle α, the greater the value of F. 斜拉 The larger the value, the more likely it is to be pulled vertically; when α is 90°, vertical back pull is used; when α is less than 90°, oblique back pull is used.

[0048] Step 3: When the site meets the minimum setting conditions for angle α, the oblique back tension assembly is used; the back tension steel strand 10 between the upper oblique back tension anchor 9 and the lower oblique back tension anchor 11 is tensioned at angle α by the hydraulic tensioner 12.

[0049] The inclined back-stretching steel strands 10 are tensioned using the hydraulic tensioner 12. During tensioning, single steel strands are tensioned sequentially. During the first tensioning, the tension force of the steel strands is gradually increased to 30% of the design value, tensioning is paused, and the tensioned ends are locked. During the second tensioning, the tension force of the steel strands is gradually increased to 50% of the design value, tensioning is paused, and the steel strands are locked, thus completing the pre-tensioning of the steel strands. The hydraulic tensioner 12 is not removed.

[0050] During the lifting process of truss structure 1 off the ground, the horizontal displacement and verticality of truss structure 1 are monitored in real time by a level monitoring instrument on the lifting platform 5. Based on the monitoring results, the tension of the back tension steel strand 10 is dynamically adjusted through the reserved hydraulic tensioner 12. When the horizontal displacement of the lifting end of truss structure 1 is too large, the tension of the back tension steel strand 10 is increased; when the horizontal displacement of the back tension end is too large, the tension of the back tension steel strand 10 is decreased, realizing dynamic real-time adjustment, ensuring the stability of the original structural column, improving the efficiency and safety of the lifting process of truss structure 1, reducing horizontal displacement, and further improving the installation accuracy of truss structure 1.

[0051] Example 2: As Figure 1 and Figure 4 As shown, a back-pull lifting support includes a truss structure 1, a lifting fixture 2 on the side of the truss structure 1, and a back-pull fixture 3 at the rear end of the lifting fixture 2. The lifting fixture 2 includes a lifting platform 5, with six hydraulic lifters 4 on the front upper end of the lifting platform 5. Lifting steel strands 8 are provided between each hydraulic lifter 4 and the truss structure 1. A back-pull lifter 13 is provided at the rear upper part of the lifting platform 5, and a vertical back-pull lower anchor 14 is provided below the back-pull lifter 13. A back-pull steel strand 10 is provided between the back-pull lifter 13 and the vertical back-pull lower anchor 14.

[0052] like Figure 1 , Figure 4 and Figure 5 As shown, a construction method for a back-pull lifting support includes the following steps:

[0053] Step 1: Calculate the lifting force of the lifting device 2 through the truss structure 1, perform lifting construction simulation analysis and calculation, and determine the lifting reaction force; connect and fix the hydraulic lifting device 4 on the lifting platform 5 to the lower part of one side of the truss structure 1 through the lifting steel strand 8.

[0054] The mechanical design principle of the back-pulling tool is as follows:

[0055] F 提 h1=F 水平H (H is much larger than h1 and h2) (Formula 1);

[0056] F 水平 =F' 水平 (Formula 2);

[0057] F' 水平 =F 背拉 cosα (Formula 3);

[0058] α=arccos(F' 水平 / F 背拉 ) (Formula 4);

[0059] F 斜拉 =(F 提 h1) / (Hcosα) (Formula 5);

[0060] When α = 90°, F' 水平 =F 水平 =0, at this time F 竖拉 =(F 提 h1) / h2;

[0061] F 提 The reaction force for the space frame is expressed in kN; F 水平 F' is the horizontal force obtained according to the principle of equivalent bending moment, with units of kN; 水平 F is a horizontal force of equal magnitude but opposite to the horizontal force, with units of kN; 斜拉 F represents the tension force of the steel strand, measured in kN. 竖拉 α is the tension force of the steel strand, in kN; α is the angle between the steel strand and the lifting platform 5; H is the height of the truss structure 1, in m; h1 is the distance from the lifting point to the center of the truss structure 1, in m.

[0062] Step 2: Determine the back tension angle α based on the anchorage position; in Formula 5, F 提 h1 and H are constants; the larger the angle α, the greater the value of F. 斜拉 The larger the value, the more likely it is to be pulled vertically when α is 90°.

[0063] Step 3: When the site does not meet the minimum setting conditions for angle α, vertical back pull is adopted; the back pull lifter 13 is fastened to the vertical back pull lower anchor 14 through the back pull steel strand 10, and the vertical back pull lower anchor 14 bears the back pull force.

[0064] The back tensioner 13 is used to tension the vertical back tension steel strand 10. During tensioning, the steel strands are tensioned one by one in sequence. During the first tensioning, the tension force of the steel strands is tensioned to 30% of the design value, the tensioning is paused, and the tensioning end is locked. During the second tensioning, the tension force of the steel strands is tensioned to 50% of the design value, the tensioning is paused, and the steel strands are locked. The pre-tensioning of the steel strands is completed, and the back tensioner 13 is not removed.

[0065] During the lifting process of truss structure 1 off the ground, the horizontal displacement and verticality of truss structure 1 are monitored in real time by a level monitoring instrument on the lifting platform 5. Based on the monitoring results, the tension of the back tension steel strand 10 is dynamically adjusted through the reserved back tension lifting device 13. When the horizontal displacement of the lifting end of truss structure 1 is too large, the tension of the back tension steel strand 10 is increased; when the horizontal displacement of the back tension end is too large, the tension of the back tension steel strand 10 is decreased, realizing dynamic real-time adjustment, ensuring the stability of the original structural column, improving the efficiency and safety of the lifting process of truss structure 1, reducing horizontal displacement, and further improving the installation accuracy of truss structure 1.

[0066] In summary, this back-tensioned lifting support and its construction method have the advantages of compact structure, convenient operation, and good operational stability. It solves the problem of excessive horizontal displacement caused by unilateral lifting, which generates additional bending moments and affects the safety and stability of the lifting support. During the truss structure lifting process, the horizontal deformation of the structural columns is monitored in real time using monitoring fixtures. When excessive lateral horizontal displacement of the structural columns is detected, the back-tensioned steel strands are dynamically tensioned and adjusted in real time using the back-tensioning lifting device and tensioner to ensure the safety and stability of the structural columns and space frame during the lifting process and to guarantee the lifting accuracy of the truss structure.

[0067] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A construction method for a back-pull lifting support, characterized in that: The back-pull lifting support includes a truss structure (1), a lifting fixture (2) is provided on the side of the truss structure (1), and a back-pull fixture (3) is provided at the rear end of the lifting fixture (2); the lifting fixture (2) includes a lifting platform (5), an inclined back-pull assembly (6) is provided at the upper rear end of the lifting platform (5), an inclined back-pull support steel frame (7) is provided at the lower end of the inclined back-pull assembly (6), and a number of hydraulic lifters (4) are provided on the upper front side of the lifting platform (5), and lifting steel strands (8) are provided between the hydraulic lifters (4) and the truss structure (1); The inclined back-pull assembly (6) includes an inclined back-pull upper anchor (9) bolted to the upper part of the lifting platform (5), and an inclined back-pull lower anchor (11) integrally cast with reinforced concrete on the inclined back-pull support steel frame (7). A back-pull steel strand (10) is provided between the inclined back-pull upper anchor (9) and the inclined back-pull lower anchor (11). The rear end of the back-pull steel strand (10) is provided with a hydraulic tensioner (12) which is inserted and bolted to the inclined back-pull lower anchor (11). The lifting platform (5) is provided with a back pull lifting device (13) at the upper rear end, and a vertical back pull lower anchor (14) is provided below the back pull lifting device (13). A back pull steel strand (10) is provided between the back pull lifting device (13) and the vertical back pull lower anchor (14). The construction method of the back-pull lifting support includes the following steps: Step 1: Calculate the lifting force of the lifting tool (2) through the truss structure (1), perform construction simulation analysis and calculation, and determine the lifting reaction force; connect and fix the hydraulic lifting device (4) on the lifting platform (5) to the lower part of one side of the truss structure (1) through the lifting steel strand (8); Step 2: Determine the back tension angle α based on the anchoring position; Step 3: When the site does not meet the minimum setting conditions of α angle, vertical back pull is adopted; the back pull lifter (13) is fastened to the vertical back pull lower anchor (14) through the back pull steel strand (10), and the back pull force is borne by the vertical back pull lower anchor (14); Step 4: When the site meets the minimum setting conditions for angle α, the oblique back tension assembly is used; the back tension steel strand (10) between the oblique back tension upper anchor (9) and the oblique back tension lower anchor (11) is tensioned at angle α by the hydraulic tensioner (12); During the process of lifting the truss structure (1) off the ground, the horizontal displacement and verticality of the truss structure (1) are monitored in real time by the horizontal monitoring instrument on the lifting platform (5). According to the monitoring results, the tension of the back tension steel strand (10) is dynamically adjusted by the reserved back tension lifting device (13) or hydraulic tensioner (12). When the horizontal displacement of the lifting end of the truss structure (1) is too large, the tension of the back tension steel strand (10) is increased. When the horizontal displacement of the back tension end is too large, the tension of the back tension steel strand (10) is reduced to achieve dynamic real-time adjustment, ensure the stability of the original structural column, improve the efficiency and safety of the lifting process of the truss structure (1), reduce the horizontal displacement, and further improve the installation accuracy of the truss structure (1).

2. The construction method of the back-pull lifting support according to claim 1, characterized in that... The mechanical design principle of the back-pulling tool is as follows: F 提 h1 = F 水平 H Formula 1; F 水平 = F' 水平 Formula 2; F' 水平 = F 背拉 cosα (Formula 3); α = arccos(F' 水平 / F 背拉 ) Formula 4; F 斜拉 =(F 提 h1) / (Hcosα) Formula 5; When α = 90°, F' 水平 =F 水平 =0, at this time F 竖拉 =(F 提 h1) / h2; F 提 The reaction force for the space frame is expressed in kN; F 水平 F' is the horizontal force obtained according to the principle of equivalent bending moment, with units of kN; 水平 F is a horizontal force of equal magnitude but opposite to the horizontal force, with units of kN; 斜拉 F represents the tension force of the steel strand, measured in kN. 竖拉 α is the tension force of the steel strand, in kN; α is the angle between the steel strand and the lifting platform (5); H is the height of the truss structure (1), in m; h1 is the distance from the lifting point to the center of the truss structure (1), in m. H is much greater than h1 and h2.

3. The construction method of the back-pull lifting support according to claim 2, characterized in that: In Formula 5, F 提 h1 and H are constants; the larger the angle α, the greater the value of F. 斜拉 The larger the value, the more likely it is to be pulled vertically; when α is 90°, vertical back pull is used; when α is less than 90°, oblique back pull is used.

4. The construction method of the back-pull lifting support according to claim 3, characterized in that: The back-pull lifting device (13) and the hydraulic tensioner (12) are used to tension the vertical or oblique back-pull steel strands (10). During tensioning, the single steel strands are tensioned sequentially. During the first tensioning, the tension force of the steel strands is tensioned to 30% of the design value, the tensioning is paused, and the tensioning end is locked. During the second tensioning, the tension force of the steel strands is tensioned to 50% of the design value, the tensioning is paused, and the steel strands are locked to complete the pre-tensioning of the steel strands. The back-pull lifting device (13) and the hydraulic tensioner (12) are not removed.

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