A method and device for on-site assembly of large steel structures using hydraulic lifting technology

Abstract

The present invention discloses a method for hydraulically lifting large steel structures during on-site assembly. The method includes four hydraulic lifting mechanisms, which are activated sequentially based on the measurements of a total station, a theodolite, a level, and a laser plummet. The mechanisms are then activated based on the surface irregularities of the assembled lifting units, pulling objects suspended from the slings. The lifting mechanism maintains a horizontal and stable state during the pulling process, lifting the entire structure to the designed installation elevation. This method addresses the significant safety risks associated with high-altitude bulk loading operations when relying solely on hydraulic devices to pull objects. The method improves overall stability during welding and enhances the stability of objects during the lifting process.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and in particular relates to a method and device for on-site assembly and overall hydraulic lifting of a large steel structure. Background Art

[0002] In recent years, steel structures have been widely used not only in marine engineering and bridge engineering, but also in industrial and civil construction. The application of steel structures in my country's building structures is also increasing. Due to its strong adaptability, it has been widely used in large-span spatial structures in recent years. As a result, the assembly and hoisting conditions are becoming more and more complex, and the technical requirements are becoming more and more demanding. Hoisting is also widely used in the high-altitude suspension, welding and fixing of objects.

[0003] However, in the construction field, hydraulic devices are required for the installation and welding fixation of large steel structures at higher positions on site. Relying solely on hydraulic devices to pull and lift items will cause great safety hazards in high-altitude bulk operations. The shaking during the lifting process will make the assembly accuracy of high-altitude operations difficult to control and the assembly quality poor. Therefore, it does not meet the existing needs. We have proposed a method and device for the overall hydraulic lifting of large steel structures on site. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for on-site assembly of overall hydraulic lifting of large steel structures. A first lower support bar is provided on one side of the lower end of the lifting platform, an H-shaped reinforcement structure is provided at the lower end of the first lower support bar, and a concrete fixing block is located at the lower end of the H-shaped reinforcement structure. During the actual welding and lifting process of the objects, the overall stability can be improved during the welding process, and the stability of the objects during the lifting process can be improved. In addition, during the installation process, the positions of the four temporary spreaders should be adjusted at the installation position. The adjustment of the positions of the four temporary spreaders can further improve the stability during the lifting process.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method and device for hydraulically lifting a large steel structure during on-site assembly, comprising the following steps:

[0007] Step 1: Use a total station to measure the slant distance and horizontal distance of the structure to be hung and installed, and use a theodolite to measure the horizontal and vertical angles of the object's movement;

[0008] Step 2: Set up a reference object at the installation location of the lifting unit, use an infrared distance measuring device to measure the distance between the lifting unit and the reference object, and simultaneously use a laser plummet to measure the altitude of the current construction location;

[0009] Step 3: Use a level to measure whether the lifting unit placed on the ground and about to be raised is level. For lifting units with a larger horizontal area, use a level to measure the horizontal heights on both sides of the lower end of the lifting unit to determine the height difference between the two sides.

[0010] Step 4: Use a thermometer and a hygrometer to measure the temperature and humidity of the construction site respectively;

[0011] Step 5: If the site directly below the construction site is measured by the level instrument to be flat and ready for assembly, assemble the lifting unit directly on the site directly below the construction site. If the site is measured by the level instrument to be uneven or there are problems such as height differences, set up a bracket directly below the construction site according to the actual situation and complete the assembly of the lifting unit.

[0012] Step 6: After the assembly cradle erected directly below the construction location is completed and the horizontal heights on both sides of the bracket are measured with a level, the lifting unit is supported on the upper end of the erected bracket, and the infrared distance measuring device is used again to measure the distance between the lifting unit and the reference object;

[0013] Step 7: Pour four sets of concrete frame structures. According to the temperature and humidity of the construction site measured by the thermometer and hygrometer, determine the concrete setting time, and lift them one by one to ensure smooth lifting.

[0014] Step 8: For each of the four concrete frame structures, install a corresponding hydraulic lifting mechanism, and install an H-shaped reinforcement structure at the lower end of the four hydraulic lifting mechanisms;

[0015] Step 9: Prepare four steel strands and connect them to the four hydraulic lifters. Install temporary lifting devices at the lower lifting points of the equipment at the corresponding positions of the upper lifting points of the objects to be lifted.

[0016] Step 10. The four hydraulic lifting mechanisms are started in sequence according to the measurements of the total station, theodolite, level and laser plumb line, and the unevenness of the surface after the lifting units are assembled. The objects suspended by the slings are pulled to keep them level and stable during the pulling process, and the whole is lifted to the designed installation elevation. The subsequent installation of the roof steel corridor is completed by welding.

[0017] Preferably, the H-shaped reinforcement structure in step five is installed by welding, and the flexural deformation and wave shape of the H-shaped reinforcement structure in step five caused by welding are corrected by mechanical correction and flame heating correction methods.

[0018] Preferably, in the process of welding and fixing the H-shaped reinforcement structure in step five, carbon dioxide gas shielded welding rods and flux are required for welding, and a windproof structure is used to assist in welding.

[0019] Preferably, the purity of carbon dioxide gas is higher than 99.5% and the water content is less than 0.0066%.

[0020] Preferably, a windproof structure is adopted when the wind speed is greater than 3m / s.

[0021] Preferably, it includes a lifting platform on one side of the lower end of the hydraulic lifting mechanism, a first lower support bar is provided on one side of the lower end of the lifting platform, a second lower support bar is provided on the other side of the lower end of the lifting platform, and the upper ends of the second lower support bar and the first lower support bar are both integrated with the lower end of the lifting platform, and a fixing bar is provided between the first lower support bar and the second lower support bar.

[0022] Preferably, the lower end of the first lower support bar is provided with an H-shaped reinforcement structure, the lower end of the H-shaped reinforcement structure is provided with a concrete fixing block, and the lower end of the second lower support bar is provided with a fixing block.

[0023] Preferably, there are four lifting platform arrays, and a carrying ring is provided at one end of each of the four lifting platforms. An embedded through hole is provided inside the carrying ring, and the embedded through hole is embedded in the inside of the carrying ring. Sliding cavities are provided at the upper and lower ends of the embedded through hole, and the sliding cavity passes through the embedded through hole and extends to the upper and lower ends of the carrying ring.

[0024] Preferably, a hydraulic lifting mechanism is provided on one side of the upper end of the load-bearing ring, the lower end of the hydraulic lifting mechanism is fixedly connected to the upper end of the load-bearing ring via a fixed connecting ring, and a steel strand is provided at the lower end of the hydraulic lifting mechanism.

[0025] Preferably, a temporary sling is provided at the lower end of the steel strand, the temporary sling is fixedly connected to the steel strand via a fixed connecting ring, and a device to be lifted is provided on one side of the exterior of the temporary sling.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention is provided with a first lower support bar on one side of the lower end of the lifting platform, and an H-shaped reinforcement structure is provided at the lower end of the first lower support bar. The concrete fixing block is located at the lower end of the H-shaped reinforcement structure. During the actual welding and the process of lifting the object, welding is performed by welding rods and flux, and auxiliary welding is performed by carbon dioxide gas with a purity higher than 99.5% and a water content lower than 0.0066%. The overall stability can be improved during the welding process, and the stability during the lifting process of the object can be improved. In addition, during the installation process, the positions of the four temporary spreaders should be adjusted according to the installation position. The adjustment of the positions of the four temporary spreaders can further improve the stability during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1This is a flow chart of the method for on-site assembly and overall hydraulic lifting of a large steel structure according to the present invention;

[0029] Figure 2 A three-dimensional diagram showing the positional relationship of the four lifting platforms of the present invention;

[0030] Figure 3 A three-dimensional diagram showing the positional relationship between the hydraulic lifting mechanism and the lifting platform of the present invention;

[0031] Figure 4 For the present invention Figure 3 A partial enlarged view of area A in the middle.

[0032] In the figure: 1. Fixing bar; 2. Concrete fixing block; 3. Device to be raised; 4. Lifting platform; 5. Fixing block; 6. First lower support bar; 7. H-shaped reinforcement structure; 8. Hydraulic lifting mechanism; 9. Steel strand; 10. Temporary spreader; 11. Fixed connecting ring; 12. Second lower support bar; 13. Embedded through hole; 14. Sliding cavity; 15. Loading ring; 16. Fixed connecting ring. Implementation Method

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In order to solve the problem of high-position installation and welding fixation of large steel structures in the construction field, hydraulic devices are needed. However, relying solely on hydraulic devices to lift objects will cause great safety hazards in high-altitude bulk operations. Due to the shaking during the lifting process, the assembly accuracy of high-altitude operations will be difficult to control and the assembly quality will be poor. Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , this embodiment provides the following technical solutions:

[0035] A method for on-site assembly and overall hydraulic lifting of a large steel structure comprises the following steps:

[0036] Step 1: Use a total station to measure the slant distance and horizontal distance of the structure to be hung and installed, and use a theodolite to measure the horizontal and vertical angles of the object's movement;

[0037] Step 2: Set up a reference object at the installation location of the lifting unit, use an infrared distance measuring device to measure the distance between the lifting unit and the reference object, and simultaneously use a laser plummet to measure the altitude of the current construction location;

[0038] Step 3: Use a level to measure whether the lifting unit placed on the ground and about to be raised is level. For lifting units with a larger horizontal area, use a level to measure the horizontal heights on both sides of the lower end of the lifting unit to determine the height difference between the two sides.

[0039] Step 4: Use a thermometer and a hygrometer to measure the temperature and humidity of the construction site respectively;

[0040] Step 5: If the site directly below the construction site is measured by the level instrument to be flat and ready for assembly, assemble the lifting unit directly on the site directly below the construction site. If the site is measured by the level instrument to be uneven or there are problems such as height differences, set up a bracket directly below the construction site according to the actual situation and complete the assembly of the lifting unit.

[0041] Step 6: After the assembly cradle erected directly below the construction location is completed and the horizontal heights on both sides of the bracket are measured with a level, the lifting unit is supported on the upper end of the erected bracket, and the infrared distance measuring device is used again to measure the distance between the lifting unit and the reference object;

[0042] Step 7: Pour four sets of concrete frame structures. According to the temperature and humidity of the construction site measured by the thermometer and hygrometer, determine the concrete setting time, and lift them one by one to ensure smooth lifting.

[0043] Step 8: For the four groups of concrete frame structures, each group is equipped with a corresponding hydraulic lifting mechanism 8, and an H-shaped reinforcement structure is installed at the lower end of the four hydraulic lifting mechanisms 8;

[0044] Step 9: Prepare four steel strands and connect them to the four hydraulic lifters. Install temporary lifting devices at the lower lifting points of the equipment at the corresponding positions of the upper lifting points of the objects to be lifted.

[0045] Step 10. The four hydraulic lifting mechanisms 8 are started in sequence for the measurement of the total station, theodolite, level and laser plumb line, and for the unevenness of the surface after the lifting units are assembled, to pull the objects suspended by the slings so that they remain horizontal and stable during the pulling process, and the whole is lifted to the designed installation elevation, and the subsequent installation of the roof steel corridor is completed by welding.

[0046] In order to solve the problem of poor stability and easy fracture of on-site welding of large steel structures, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , this embodiment provides the following technical solutions:

[0047] The H-shaped reinforcement structure in step five is installed by welding and fixed. The flexural deformation and wave shape of the H-shaped reinforcement structure caused by welding in step five are corrected by mechanical correction and flame heating correction methods. In the process of welding and fixing the H-shaped reinforcement structure in step five, carbon dioxide gas shielded welding rods and flux are required, and a windproof structure is used to assist welding. The purity of carbon dioxide gas must be higher than 99.5%, and the water content must be less than 0.0066%. When the wind speed is greater than 3m / s, a windproof structure is adopted. While welding is performed by welding rods and flux, carbon dioxide gas with a purity higher than 99.5% and a water content less than 0.0066% is used for auxiliary welding. Improving the overall stability during the welding process and the stability during the lifting process of the items can be improved. In addition, during the installation process, the positions of the four temporary slings should be adjusted to the installation position. Adjustment of the positions of the four temporary slings can further improve the stability during the lifting process.

[0048] In order to solve the problem of poor stability during the hydraulic lifting process of large steel structures during on-site assembly, the poor stability of the stretched position may cause the position to tilt during the lifting process and affect the subsequent welding. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , this embodiment provides the following technical solutions:

[0049] A large-scale steel structure on-site assembled integral hydraulic lifting device, including a lifting platform 4 on one side of the lower end of a hydraulic lifting mechanism 8, a first lower support bar 6 is provided on one side of the lower end of the lifting platform 4, a second lower support bar 12 is provided on the other side of the lower end of the lifting platform 4, and the upper ends of the second lower support bar 12 and the first lower support bar 6 are integrated with the lower end of the lifting platform 4, a fixing bar 1 is provided between the first lower support bar 6 and the second lower support bar 12, the lower end of the first lower support bar 6 is provided with an H-shaped reinforcement structure 7, the lower end of the H-shaped reinforcement structure 7 is provided with a concrete fixing block 2, and the lower end of the second lower support bar 12 is provided with a fixing block 5. There are four platforms 4 arrayed, and the lifting platform 4 is supported and restricted as a whole by the first lower support bar 6 and the second lower support bar 12. The first lower support bar 6 and the second lower support bar 12 on both sides can improve the carrying capacity and stability of the lifting platform 4 and the entire device. The first lower support bar 6 at the main bearing position is further reinforced and supported by the H-shaped reinforcement structure 7, thereby increasing the contact area between the first lower support bar 6 and the concrete fixed block 2, thereby dispersing the pressure, avoiding the concrete fixed block 2 from bearing a large force at an independent point, which may easily cause the concrete fixed block 2 to dent and break, and improving safety during use.

[0050] In order to solve the problem of improving the installation efficiency of the entire structure and at the same time improving the disassembly efficiency of the lifting structure, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , this embodiment provides the following technical solutions:

[0051] One end of each of the four lifting platforms 4 is provided with a load ring 15, an embedded through hole 13 is provided inside the load ring 15, and the embedded through hole 13 is embedded in the interior of the load ring 15, and the upper and lower ends of the embedded through hole 13 are provided with a sliding cavity 14, and the sliding cavity 14 passes through the embedded through hole 13 and extends to the upper and lower ends of the load ring 15, and a hydraulic lifting mechanism 8 is provided on one side of the upper end of the load ring 15, and the lower end of the hydraulic lifting mechanism 8 is fixedly connected to the upper end of the load ring 15 by a fixed connecting ring 16, and a steel strand 9 is provided at the lower end of the hydraulic lifting mechanism 8, and a temporary sling 10 is provided at the lower end of the steel strand 9, and the temporary sling 10 and the steel strand 9 are fixed by a fixed connecting ring 11. Fixed connection, a device to be lifted 3 is provided on one side of the exterior of the temporary spreader 10, and the overall weight of the lifting platform 4 is reduced by the recessed embedded through-hole 13 to avoid all the weight being supported on the upper end of the concrete fixed block 2, and the further recessed sliding cavity 14 can facilitate the installation of the hydraulic lifting mechanism 8 and the steel strand 9. The steel strand 9 can slide directly from the sliding cavity 14 to the inside of the load-bearing ring 15, which is convenient for the hydraulic lifting mechanism 8 to be installed on the upper end of the load-bearing ring 15 through the fixed connecting ring 16, and is also convenient for the vertical placement of the steel strand 9. At the same time, the extension and contraction of the hydraulic lifting mechanism 8 can drive the steel strand 9 to slide directly in the sliding cavity 14, so that the lifting of the overall lifting unit remains stable, thereby improving the safety of construction.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for hydraulic lifting of large steel structures assembled on site, characterized in that: The steps include: Step 1: Use a total station to measure the slant distance and horizontal distance of the structure to be hung and installed, and use a theodolite to measure the horizontal and vertical angles of the object's movement; Step 2: Set up a reference object at the installation location of the lifting unit, use an infrared distance measuring device to measure the distance between the lifting unit and the reference object, and simultaneously use a laser plummet to measure the altitude of the current construction location; Step 3: Use a level to measure whether the lifting unit placed on the ground and about to be raised is level. For lifting units with a larger horizontal area, use a level to measure the horizontal heights on both sides of the lower end of the lifting unit to determine the height difference between the two sides. Step 4: Use a thermometer and a hygrometer to measure the temperature and humidity of the construction site respectively; Step 5: If the site directly below the construction site is measured by the level instrument to be flat and ready for assembly, assemble the lifting unit directly below the construction site. If the site is measured by the level instrument to be uneven or there is a height difference, set up a bracket directly below the construction site according to the actual situation and complete the assembly of the lifting unit. Step 6: After the assembly cradle erected directly below the construction location is completed and the horizontal heights on both sides of the bracket are measured with a level, the lifting unit is supported on the upper end of the erected bracket, and the infrared distance measuring device is used again to measure the distance between the lifting unit and the reference object; Step 7: Pour four sets of concrete frame structures. According to the temperature and humidity of the construction site measured by the thermometer and hygrometer, determine the concrete setting time, and lift them one by one to ensure smooth lifting. Step 8: For the four groups of concrete frame structures, each group is equipped with a corresponding hydraulic lifting mechanism (8), and an H-shaped reinforcement structure is installed at the lower end of the four hydraulic lifting mechanisms (8); Step 9: Prepare four steel strands and connect them to the four hydraulic lifters. Install temporary lifting devices at the lower lifting points of the equipment at the corresponding positions of the upper lifting points of the objects to be lifted. Step 10: The four hydraulic lifting mechanisms (8) are activated in sequence to measure the total station, theodolite, level and laser plummet, and to pull the objects suspended by the slings so that they remain horizontal and stable during the pulling process, and the entire structure is lifted to the designed installation elevation, and the subsequent installation of the roof steel corridor is completed by welding; A large steel structure on-site assembled integral hydraulic lifting device applied to the above method comprises a lifting platform (4) on one side of the lower end of a hydraulic lifting mechanism (8), a first lower support bar (6) being provided on one side of the lower end of the lifting platform (4), a second lower support bar (12) being provided on the other side of the lower end of the lifting platform (4), and the upper ends of the second lower support bar (12) and the first lower support bar (6) being an integral structure with the lower end of the lifting platform (4), and a fixing bar (1) being provided between the first lower support bar (6) and the second lower support bar (12); The lower end of the first lower support bar (6) is provided with an H-shaped reinforcement structure (7), the lower end of the H-shaped reinforcement structure (7) is provided with a concrete fixing block (2), and the lower end of the second lower support bar (12) is provided with a fixing block (5).

2. The method for hydraulically lifting a large steel structure on-site assemblage according to claim 1, characterized in that: The H-shaped reinforcement structure in step five is installed by welding. The flexural deformation and wave shape of the H-shaped reinforcement structure in step five caused by welding are corrected by mechanical correction and flame heating correction.

3. The method for hydraulically lifting a large steel structure during on-site assembly according to claim 1, characterized in that: During the welding and fixing process of the H-shaped reinforcement structure in step five, carbon dioxide gas shielded welding rods and flux are used for welding, and a windproof structure is used to assist in welding.

4. The method for hydraulically lifting a large steel structure during on-site assembly according to claim 3, characterized in that: The purity of carbon dioxide gas is above 99.5% and the water content is less than 0.0066%.

5. The method for on-site assembly and overall hydraulic lifting of a large steel structure according to claim 4, characterized in that: When the wind speed is greater than 3m / s, a windproof structure should be adopted.

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