A method for lifting a whole cantilever structure on one side

Abstract

The application discloses a kind of four peripheral cantilever structure one-side integral lifting construction methods, and specific construction steps are as follows: (1) the projection position of four peripheral cantilever structure is assembled in situ in the design position corresponding ground position;(2) the four peripheral cantilever structure is reinforced to form a whole by temporary reinforcing measure;(3) install lifting construction corresponding measure, including temporary lifting frame, hydraulic hoist upper lifting point and lower lifting point lifting appliance etc.;(4) after preparation is completed, try to lift structure and take off 200mm or so, and stand still for 4~6 hours;(5) after standing still is completed and measures no abnormality, officially continue to lift structure to design position;(6) install the post-supplement bar between lifting structure and main structure;(7) after post-supplement bar installation is completed, unload hoist;(8) remove four peripheral cantilever structure between temporary reinforcing measure, complete structure installation.The lifting construction method of the application reinforcing structure is simple, and strong in implementability, avoids the erection of conventional use large-scale machinery hoisting and temporary support, and is good in economy, while avoiding a large amount of high-altitude operation, and is high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building steel structure, in particular to a one-side integral lifting construction method for a four-side overhanging structure. BACKGROUND

[0002] The hydraulic lifting construction method is widely used in steel structure installation engineering due to the advantages of less high-altitude operation, high safety, convenient construction, and good economy. The lifting points of the conventional hydraulic lifting construction are uniformly arranged on the structure to be lifted to ensure the overall stability of the structure during lifting. For a four-side overhanging structure (one or more monomers), especially a high overhanging structure, it is difficult to ensure the stability of the overhanging structure during lifting because the lifting frame cannot be erected on the overhanging side, and the lifting points can only be arranged on one side of the overhanging structure. Therefore, the conventional method can only use the block hoisting method, which brings many disadvantages such as large amount of high-altitude operation, high risk, high construction difficulty and cost, etc. SUMMARY

[0003] The present application provides a one-side integral lifting construction method for a four-side overhanging structure, which has the advantages of simple reinforcement structure, strong implementability, avoidance of the use of large machinery and temporary support erection, good economy, avoidance of a large amount of high-altitude operation, and high safety.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a one-side integral lifting construction method for a four-side overhanging structure, the specific construction steps are as follows:

[0005] (1) Assembling the four-side overhanging structure in situ at the projection position of the design position on the ground;

[0006] (2) Reinforcing the four-side overhanging structure to form a whole by using temporary reinforcement measures;

[0007] (3) Installing the corresponding measures for lifting construction, including temporary lifting frame, upper lifting point of hydraulic lifter, and lower lifting point hanger, etc.;

[0008] (4) After preparation, lifting the structure by about 200mm, and standing still for 4-6 hours;

[0009] (5) After standing still and measuring and monitoring that there is no abnormality, formally continuing to lift the structure to the design position;

[0010] (6) Installing the post-supplementing rod between the lifting structure and the main structure;

[0011] (7) After the installation of the post-supplementing rod is completed, unloading the lifter;

[0012] (8) remove the temporary reinforcement measures between the four cantilever structures, and complete the structure installation.

[0013] Further, the lifting points should be uniformly and symmetrically arranged to ensure the balance during the lifting of the four cantilever structures.

[0014] Further, the center of gravity should be located within the frame formed by the lifting points during the lifting construction of the four cantilever structures, near the center position, otherwise counterweight should be set on the structure to adjust the center of gravity.

[0015] Further, the counterweight should not be concentratedly arranged to avoid excessive local stress on the structure; at the same time, the convenience of removing the counterweight after construction should also be considered.

[0016] Further, the design of temporary reinforcement measures should ensure the integrity of the four cantilever structures during lifting, so that the structure has sufficient stiffness; in particular, the reinforcement between multiple single structures should be designed in combination with the structure form and cantilever length; to ensure the effectiveness of reinforcement, a ring of reinforcement measures is set at the lifting point position, and the design of temporary reinforcement measures should be finally determined through overall lifting finite element calculation and analysis.

[0017] Further, during the lifting construction of the four cantilever structures, the post-installation section of the interface between the structure and the main structure is left to avoid the problem of difficult installation due to the misalignment of the interface.

[0018] Further, after the structure is removed during the trial lifting stage, the deformation of the structure should be monitored and compared with the theoretical value to ensure the integrity of the structure.

[0019] Further, the unloading of the lifter should be synchronized and symmetrical.

[0020] Further, the removal of temporary reinforcement measures should be carried out from the outer ring to the inner ring to reduce the impact on the structure during the removal process.

[0021] Further, the counterweight measures should be removed before the installation of the post-supplementing member and the unloading of the lifter.

[0022] The present application has the following beneficial effects:

[0023] (1) The present application can realize the unilateral overall lifting construction of the four cantilever structures or the four cantilever structures of multiple single structures, which cannot be realized by the conventional hydraulic lifting construction method, bringing flexibility to the cantilever structure construction;

[0024] (2) The construction method of the present application is simple, and the required machinery is small, especially suitable for the construction of four cantilever steel structures with high structure and large cantilever, which can avoid the use of large machinery lifting and the erection of temporary support, and has good economic efficiency;

[0025] (3) The present application can lift the horse path, purlin and other substructures together to avoid subsequent high-altitude installation, save labor and machinery cost;

[0026] (4) The welding operation of the lifted structure rod is almost completed on the assembling surface, avoiding a large amount of high-altitude operation, being safe and high in construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a whole lifting construction method of the present application;

[0028] Fig. 2 is a whole lifting construction method of the present application. DETAILED DESCRIPTION

[0029] REFERENCE Figs. 1-2 The present application is further described in detail with reference to a specific embodiment of a whole lifting construction method of a four-side overhanging structure.

[0030] A whole lifting construction method of a four-side overhanging structure, comprising a hydraulic hoist 1, a temporary lifting frame 2, a lower lifting point hoist 3, temporary reinforcement measures 4, a counterweight, a lifted four-side overhanging structure 6 and a main body structure 7.

[0031] A whole lifting construction method of a four-side overhanging structure, and the specific construction steps are as follows:

[0032] 1. The four-side overhanging structure 6 is assembled in situ at the position corresponding to the projection of the ground;

[0033] 2. The four-side overhanging structure 6 is reinforced by the temporary reinforcement measures 4 to form a whole, and the temporary reinforcement measures 4 are designed to ensure the integrity of the four-side overhanging structure 6 during lifting, so that the structure has sufficient rigidity; in particular, the reinforcement between multiple monomer structures needs to be designed in combination with the structure form and the overhanging length; in order to ensure the effectiveness of the reinforcement, a circle of reinforcement measures is preferably arranged at the lifting point position. The design of the temporary reinforcement measures 4 needs to be finally determined through finite element calculation and analysis of the whole lifting;

[0034] 3. Install the corresponding measures for lifting construction, including the temporary lifting frame 2, the hydraulic hoist 1 and the lower lifting point hoist 3, etc., and the lifting points should be uniformly and symmetrically arranged to ensure the balance of the four-side overhanging structure during lifting;

[0035] 4. After preparation, the structure is lifted by about 200mm, and is left for 4-6 hours. After the structure is lifted, the deformation of the structure is monitored and compared with the theoretical value to ensure the integrity of the structure. When the four-side cantilever structure 6 is lifted, the center of gravity should be located in the frame formed by the lifting point, preferably near the center, otherwise the center of gravity should be adjusted by setting counterweights on the structure. The counterweights should not be concentratedly arranged to avoid excessive stress on the structure. At the same time, the convenience of removing the counterweights after construction should also be considered;

[0036] 5. After the static state is measured and no abnormalities are found, the structure is formally lifted to the designed position. When the four-side cantilever structure 6 is lifted, the rear-mounted section should be left at the interface between the four-side cantilever structure 6 and the main structure 7 to avoid errors in the interface and installation difficulties;

[0037] 6. The rear-mounted section and the rear-supplemented rod between the four-side cantilever structure 6 and the main structure 7 is installed.

[0038] 7. After the rear-supplemented rod is installed, the hydraulic hoist 1 is unloaded. The hoist should be unloaded synchronously and symmetrically.

[0039] 8. The temporary reinforcing measures 4 between the four-side cantilever structure 6 are removed. The temporary reinforcing measures 4 should be removed from the outer circle to the inner circle to reduce the impact on the structure during the removal process. If there are counterweights, the counterweights should be removed before the rear-supplemented rod is installed and the hoist is unloaded.

[0040] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiment. Any technical solution that falls within the scope of the present application should be considered within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application should also be considered within the protection scope of the present application.

Claims

1. A construction method for a single-sided integral lifting of a cantilevered structure with four sides, characterized in that, The specific construction steps are as follows: (1) Assemble the cantilever structure on all four sides in situ at the projected position on the ground corresponding to the design position; (2) Temporary reinforcement measures were adopted to reinforce the cantilevered structure on all four sides to form a whole; (3) Install and lift corresponding construction measures, including temporary lifting frame, hydraulic lifting device upper and lower lifting point lifting tools; (4) After preparation, try lifting the structure by 200mm and let it stand for 4-6 hours; (5) After the static setting is completed and the measurement and monitoring show no abnormalities, the structure is officially lifted to the design position; (6) Install the supplementary members between the lifting structure and the main structure; (7) After the replacement rods are installed, unload the lifting device; (8) Remove the temporary reinforcement measures between the cantilevered structures on all four sides and complete the structural installation; The design of temporary reinforcement measures must ensure the integrity of the cantilever structure when it is lifted, so that the structure has sufficient rigidity; The reinforcement between multiple individual structures needs to be designed in combination with the structural form and cantilever length; to ensure the effectiveness of the reinforcement, a ring of reinforcement measures should be set at the lifting point. The design of temporary reinforcement measures needs to be finally determined by the overall lifting finite element calculation analysis. The temporary reinforcement measures were removed one ring at a time, from the outer ring to the inner ring, to minimize the impact on the structure during the removal process.

2. The construction method for single-sided integral lifting of a cantilevered structure according to claim 1, characterized in that: The lifting points should be evenly and symmetrically arranged to ensure the balance of the cantilever structure during the lifting process.

3. The construction method for unilateral integral lifting of a cantilevered structure according to claim 1, characterized in that: When constructing a cantilevered structure, it is necessary to ensure that the center of gravity is located within the frame formed by the lifting points, near the center. Otherwise, the center of gravity needs to be adjusted by setting counterweights on the structure.

4. The construction method for unilateral integral lifting of a cantilevered structure according to claim 3, characterized in that: Counterweights should not be centrally located to avoid excessive local stress on the structure; the ease of removal of counterweights after construction should also be considered.

5. The construction method for single-sided integral lifting of a cantilevered structure according to claim 1, characterized in that: When constructing the cantilever structure on all four sides, a post-installation section is left at the interface between it and the main structure to avoid installation difficulties caused by multiple misalignments at the interface.

6. The construction method for unilateral integral lifting of a cantilevered structure according to claim 1, characterized in that: After the structural demolition phase, it is necessary to monitor the structural deformation and compare it with the theoretical value to ensure the integrity of the structure.

7. The construction method for single-sided integral lifting of a cantilevered structure according to claim 1, characterized in that: When the lifter is unloaded, the process is synchronized and symmetrical.

8. The construction method for unilateral integral lifting of a cantilevered structure according to claim 4, characterized in that: The counterweight measures were removed after the installation of the supplementary rods was completed and before the lifting device was unloaded.

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