Cast-in-place beam steel stand column support rapid hoisting sling and hoisting process

Abstract

According to the cast-in-place beam steel stand column supporting rapid hoisting sling and the hoisting technology, the sling clamps a steel stand column, a steel wire rope bypasses the other half of the steel stand column, the steel wire rope and the sling are fixed together through a U-shaped clamping ring, and when the steel wire rope and the homemade sling hoist the steel stand column, the steel wire rope is automatically dragged tightly under the action of gravity of the steel stand column; the trend that the heavier the lifted weight is, the higher the locking degree of the lifting appliance to the steel stand column is is is formed, and the steel stand column is successfully lifted. When the steel stand column is lifted in place and is firmly fixed with the foundation, and the situation that the steel stand column is not inclined or overturned after unhooking is ensured, an operator drags the mooring rope tied on the lifting appliance, so that the steel stand column lifting steel wire rope and the lifting appliance can slide to the ground along the steel stand column together, and then the U-shaped clamping ring is loosened to lift the next steel stand column. The problem that the steel stand column is easy to unhook during hoisting is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction hoisting, and in particular relates to a cast-in-place beam steel column support rapid hoisting sling and a hoisting process. Background Art

[0002] With the rapid development of economy and society, a series of large-span and difficult special-shaped bridges such as cable-stayed bridges and rotating bridges are constantly coming out. However, they are often restricted by existing railways and highways. Under the premise of not interfering with and threatening the operation of existing railways and highways, rotating bridges have become the preferred construction plan, and cable-stayed rotating bridges have become a new trend of large-span rotating development. The cast-in-place method of rotating beam brackets has the characteristics of fast construction speed, high safety factor and low cost, and occupies the main position in the construction of rotating cast-in-place beams. At present, there are construction safety risks in the steel columns of the cast-beam scaffolding system, as well as difficulties in unhooking after installation and multiple mechanical construction. Summary of the invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a cast-in-place beam steel column support rapid lifting sling and lifting process, combined with the construction characteristics under soft stratum conditions, from the aspects of shortening the construction period, reducing construction costs, reducing construction safety risks, and improving environmental protection, the design and construction of the cast-in-place beam scaffolding system steel column are comprehensively considered, a conventional automobile crane is used to realize multi-directional construction and use of one machine, a self-made simple sling is used to realize the lifting and installation of the steel column, the problem of difficulty in unhooking the steel column after installation is solved, and the temporary construction investment for replacement and filling treatment of a one-time construction site during multi-machine construction is avoided, which not only saves the cost of using machinery and materials, but also avoids the pollution to the environment caused by site treatment, and further improves the lifting construction efficiency, with high safety factor, simple operation, reduced construction cost, shortened construction period, and especially solves the problem of easy unhooking of the lifting and hoisting of the steel column.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A cast-in-place beam steel column support rapid lifting sling and lifting process, characterized by comprising the following steps: Step 1: Construction preparation: Site preparation, steel column foundation construction, steel column material delivery, lifting equipment delivery, and material delivery acceptance; Step 2: Measure foundation elevation; After the construction of the concrete strip foundation is completed, before the steel columns are installed, the actual elevation of the installation position of the strip foundation steel columns needs to be re-measured, and the elevation error should be less than 5mm; Step 3: Process the top surface of the foundation; Level the top surface of the foundation, clean the soil on the top surface of the foundation, and straighten the anchor steel bars; Step 4: Measure the length of the steel column; There are different degrees of deviation in the use of steel columns, and with the ups and downs of the terrain, the top elevations of the strip foundations at different locations are all different. However, the top surface of the steel column must be adjusted to a horizontal plane to ensure the smooth subsequent construction of the Bailey beam, the buckle frame, etc. Therefore, when installing the steel column, it is necessary to adjust the length of the steel column according to the foundation elevation. After the steel column is put into the site, the actual length of the steel column is adjusted through the adjustment section of the steel column according to the foundation elevation and the control elevation of the top of the steel column; Step 5: Make the sling; According to the outer diameter of the steel column, the weight of the connecting flange of the steel column, and the safety factor of 1.2 times, combined with the shape of the hanger, it is calculated that the hanger is made on-site using a steel plate with a thickness of t=20mm. The hanger structure is semicircular, with round holes at both ends and a connecting ear plate in the middle. Step 6: Support the lifting machinery; For steel column installation, a 25t truck crane is used for lifting and hoisting operations; the site should be prepared in advance. When the truck crane is parked, after all the legs are erected, the truck crane should be on a horizontal plane, and sleepers must be laid at the bottom of all the legs; Step 7: Installation of slings and slings; During hoisting, pass the hoisting wire rope around the front end of the steel column to be installed and connect the hoisting wire rope to the hoisting device through the U-shaped clamp ring, and hang it on the hook of the truck crane. The wire rope wrapped around the front end of the steel column is in close contact with the flange of the steel column. After the U-shaped clamp ring is installed, the U-shaped ring can move freely during the hoisting process; Step 9: Lift the steel column; After the lifting conditions are met, the steel column is lifted; when the crane is lifting, the wire rope is automatically tightened under the tension of the steel pipe's own weight, and together with the lifting device, it tightly holds the steel column and is then lifted; Step 10: Fix the steel column; After the steel column is moved to the installation position, the crane is commanded to adjust the installation position of the steel column and ensure the verticality of the steel column. The installer installs a magnetic level ruler on the side wall of the steel column to determine the verticality of the steel column, and uses a crowbar and a wedge-shaped steel plate to fine-tune the steel column to ensure the verticality of the steel column; after the adjustment is in place and meets the requirements, the anchor steel bars embedded in the foundation of the steel column are bent until they are close to the steel column, and then welded to connect. After the anchor steel bars are connected, the template is installed around the bottom of the steel column base, and then the support is grouted and sealed with a support grouting material with an elevation of not less than C50 to ensure that there is no gap between the steel column and the base; Step 11, unloading the sling and sling; After the steel column is firmly fixed, release the hook of the truck crane, manually pull the cable tied to the sling, and the steel wire rope tied to the steel column will slide down along the hole of the steel column sling and release it, and the sling will fall freely to the ground; completing one lifting.

[0005] The manual pulling of the cable tied to the sling can reduce the angle between the cable and the steel column as much as possible when the cable tied to the sling is pulled down, so that the steel column sling can be more easily separated from the steel column.

[0006] If the actual elevation is remeasured and exceeds the elevation error, measures need to be taken in advance to process the concrete surface of the steel column foundation. If the concrete surface elevation is uneven or exceeds the allowable error, the concrete surface needs to be chiseled off, or steel columns that can meet the actual construction needs need to be made to cope with the actual support column foundation elevation. If the top elevation of the strip foundation is low, self-compacting concrete pouring, steel plate padding, or steel columns of equivalent length can be made according to the actual elevation.

[0007] The diameter of the lifting wire rope is 20mm. If it is too thick or too thin, it will be unfavorable for lifting. If it is too thick, the wire rope will be easily stuck by the clamp and difficult to remove; if it is too thin, the safety factor is not high and it is easy to break.

[0008] The width of the site treatment should be at least one meter wider than the width of the car crane legs. If it is backfill soil, the original site should be excavated at least 30cm and then leveled and compacted. After the treatment is completed, a 30cm thick layer of crushed stone should be laid, or a 20cm thick C20 concrete should be hardened to improve the bearing capacity of the site foundation.

[0009] The beneficial effects of the present invention are: The present invention is suitable for similar steel column hoisting. Compared with the conventional steel column construction method, it realizes the convenience, speed and safety of steel column hoisting and unhooking, greatly reduces the personnel and machinery invested, avoids unnecessary site leveling, avoids the risk of high-altitude construction, and reduces invisible investment. The construction using the invention saves construction costs, shortens the construction period, optimizes the operation process, ensures construction safety, and achieves good economic and social benefits.

[0010] Economic benefits: Site treatment costs The site where the steel columns need to be installed in this project is 290m long and 30m wide. If conventional aerial platforms are used for high-altitude operations on steel columns, the total area to be leveled is 8,700m. However, when using current lifting tools to lift and install steel columns, it is only necessary to level the site at the location where the crane needs to be parked, thus avoiding large-scale site leveling. When this method is used for lifting steel columns, the crane has a total of 6 parking locations, which means that only the six locations where the crane needs to be parked and the access roads to the parking locations need to be processed, and the rest of the site remains original.

[0011] The width of the temporary access road for the lifting machinery is 3.5m, and the width of the machinery parking area is 7m wide and 9m long. The site treatment adopts a 40cm thick gravel cushion. The original site leveling required 3480m3 of gravel for the aerial work, while the site treatment method requires 243.6m3 of gravel. According to the current gravel material price of 150 yuan / m3 and the construction machinery fee of loaders and rollers (4 yuan / m2), the contract cost is about (3480-243.6)*150 yuan / m3+(8700-609)*8 yuan / m2=550,000 yuan.

[0012] Rental of aerial work climbing vehicle: A total of 238 steel columns need to be installed in this project. In the early stage, a high-altitude work vehicle was used to install the steel columns, with an average of 7 columns installed per day. The rental cost of the high-altitude work vehicle is about 800 yuan / day. If a conventional high-altitude work vehicle is used for such operations, the rental cost of the high-altitude work vehicle will be 238 / 7*800=27,200 yuan.

[0013] Input of construction workers: If a high-altitude work vehicle is used for high-altitude work and the steel columns are installed, two additional construction workers will be needed. Based on the current skilled worker wage of 320 yuan per day, the additional construction worker wages will be 238 / 7*320*2=21,800 yuan.

[0014] Construction period cost analysis When using steel column hoists to hoist steel columns, the time of using aerial platforms is saved. On average, 10 columns can be installed every day, and the installation speed is improved. Compared with the use of aerial platforms, the construction period can be saved by 238 / 7-238 / 10=10 days. The shortened construction period saves the rental fees of existing rental machinery and the wages of existing construction workers, as well as other intangible expenses. According to the average start of the current project, based on the cost of 3,000 yuan per day, the construction period cost can be saved by 10 days*3,000 yuan=30,000 yuan.

[0015] Based on the above analysis, the use of this type of steel column lifting tool for steel column lifting construction reduces the construction cost and saves economic benefits of: 55+2.72+2.18+3=629,000 yuan.

[0016] Social Benefits 1. The present invention truly solves the problem of high-altitude operations for steel column hoisting, avoids the risk of construction workers climbing up during steel column hoisting operations, reduces the investment in personnel and machinery, and reduces the cost of leveling a one-time construction site.

[0017] 2. If a aerial platform is used for construction, the site needs to be paved and leveled before construction. After the construction is completed, the materials on the temporary construction site need to be cleaned up and restored to the original site. The generated construction waste is also a form of pollution to the environment.

[0018] 3. The additional construction machinery and waste generated will have an impact on the environment.

[0019] 4. The use of steel column lifting tools has greatly saved construction time and construction costs, and has been well received by owners, supervisors and sister units, thus improving the company's competitiveness.

[0020] 5. The hoisting tools used in the present invention have accumulated experience and provided reference for subsequent similar engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a process flow chart of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the sling of the present invention.

[0023] Figure 3 It is a scene implementation diagram of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 1 , 3 As shown, a cast-in-place beam steel column support rapid lifting sling and lifting process, including the following steps: Step 1: Construction preparation: (1) Site preparation: three connections and one leveling, repair the construction access road, and ensure that the construction access road is solid, has smooth drainage, and is free of potholes.

[0026] (2) Steel column foundation construction, including bored cast-in-place piles and strip foundation construction.

[0027] (3) Delivery, mixing and modification of steel column materials.

[0028] (4) Lifting equipment and materials must be inspected upon arrival at the site and only used after they are qualified.

[0029] Step 2: Measure foundation elevation; The cast-in-place beam support foundation of the rotating bridge is designed as bored cast-in-place piles and concrete strip foundations. After the strip foundation construction is completed and before the steel columns are installed, the actual elevation of the strip foundation steel column installation position needs to be remeasured. The elevation error should be within 5mm. If it exceeds the elevation error, measures need to be taken in advance to process the concrete surface of the steel column foundation. If the concrete surface elevation is uneven or the elevation exceeds the allowable error, the concrete surface needs to be chiseled off, or steel columns that can meet the actual construction needs need to be made to cope with the actual support column foundation elevation. If the strip foundation top elevation is low, self-compacting concrete pouring, steel plate padding, or steel columns of equivalent length can be made according to the actual elevation; Step 3: Process the top surface of the foundation; During the construction of the steel column foundation, the steel column anchor steel bars and the foundation top elevation control points are pre-buried. However, due to construction reasons, there are uneven areas on the top surface of the foundation, or the anchor steel bars are not vertical. Therefore, before the steel column is hoisted, the top surface of the foundation is leveled, the soil on the top surface of the foundation is cleaned, and the anchor steel bars are straightened to ensure that the steel column can be hoisted smoothly. Step 4: Measure the length of the steel column; A large number of steel columns are used, which are jointly supplied by multiple manufacturers. There are different degrees of deviation in the specific size and the connection holes of the flange. When designing the steel column foundation, we take local conditions into consideration, and the foundation elevation is also designed according to the undulations of the terrain, so the top elevations of the strip foundations at different locations are different. However, the top surface of the steel column must be adjusted to a horizontal plane to ensure the subsequent smooth construction of the Bailey beam, the buckle frame, etc. Therefore, when installing the steel column, the length of the steel column needs to be adjusted according to the foundation elevation.

[0030] After the steel columns are delivered to the site, the actual length of the steel columns is adjusted through the adjustment sections of the steel columns according to the foundation elevation and the control elevation of the top of the steel columns.

[0031] Step 5: Make the sling; According to the outer diameter of the steel column, in line with the principle of safe and convenient lifting and unloading, the steel column lifting device is made. Since the steel columns used in this project are all of the same diameter, and the lifting device requirements are simple, it only needs to be able to achieve the purpose of safe lifting. The specifications of the steel column are 609x16, and the maximum length is 8m. Together with the weight of the connecting flange of the steel column, the maximum weight of a single steel column for lifting is 2t. Considering the safety factor of 1.2 times, combined with the shape of the lifting device, it is calculated that the lifting device is made on-site using t=20mm steel plate. The lifting device has a semi-circular structure with round holes at both ends and a connecting ear plate in the middle. Figure 2 shown.

[0032] Step 6: Support the lifting machinery; For the installation of steel columns, a 25t truck crane is used for lifting and hoisting operations. Mechanical equipment with good performance and that have passed annual inspections must be selected. The lifting and hoisting driver must have an operator's license, have received professional training, and have no criminal record.

[0033] The site where the mobile crane is placed should be flat and solid. It should not be placed in a low-lying area. The drainage around it should be unobstructed to ensure that there is no water. The site where the mobile crane is placed should be treated in advance. The site treatment width should be at least one meter wider than the width of the mobile crane's legs. If it is backfill soil, the original site should be excavated at least 30cm and then leveled and rolled. After the treatment is completed, a layer of 30cm thick gravel should be laid, or 20cm thick C20 concrete should be hardened to improve the foundation bearing capacity of the site.

[0034] When the mobile crane is parked, all outriggers should be fully extended. It is forbidden to extend only part of the outriggers. After all outriggers are erected, the mobile crane should be on a horizontal plane to avoid tilting. Sleepers must be laid at the bottom of all outriggers to diffuse the pressure transmitted to the foundation by the outriggers and reduce the compressive stress of the outriggers on the foundation. It is forbidden to support the outriggers on pipes, cables or other shallow underground structures when they are erected.

[0035] Step 7: Installation of slings and slings; Before installation, the steel column is usually laid flat on the ground. During hoisting, the lifting wire rope is passed around the front end of the steel column to be installed and connected to the lifting device through the U-shaped clamp, and hung on the hook of the truck crane. The diameter of the lifting wire rope is 20mm. Too thick or too thin will be unfavorable for hoisting. Too thick will cause the wire rope to be easily stuck by the clamp and difficult to unload; too thin wire rope has a low safety factor and is easy to break. The wire rope wrapped around the front end of the steel column must be tightly attached to the flange of the steel column to prevent the wire rope from falling off the flange of the steel column during the lifting process. The U-shaped clamp must be intact and must not have quality defects such as cracks; when installing the clamp, the bolts must be tightened, and the U-shaped ring can move freely during the lifting process.

[0036] Step 9: Lift the steel column; The lifting equipment and wire rope are firmly installed, and the lifting is carried out after the lifting conditions are met. The wire rope is automatically tightened under the tension of the steel pipe's own weight, and it is tightly held together with the lifting equipment to clamp the steel column, and then lifted. The lifting process of the steel column should be safe and stable to avoid collision between the steel column and foreign objects. After the steel column is lifted vertically and completely off the ground, the crane is rotated to move the steel column horizontally, and the movement should be slow. During the lifting process of the steel column, construction workers should stay away from the steel column and are prohibited from standing under the lifting boom. The cable tied to the lifting equipment is prohibited from being pulled hard to prevent the lifting equipment and wire rope from detaching from the steel column and causing danger.

[0037] Step 10: Fix the steel column; After the steel column is moved to the installation position, the crane wire rope is slowly lowered, and the construction workers hold the steel column and direct the crane to adjust the installation position of the steel column and ensure the verticality of the steel column. After the steel column is installed in place and the verticality meets the requirements, the crane operation is stopped, and the installation workers install a magnetic level ruler on the side wall of the steel column to determine the verticality of the steel column, and use a crowbar and a wedge-shaped steel plate to fine-tune the steel column to ensure the verticality of the steel column.

[0038] After adjustment is in place and meets the requirements, the anchor steel bars embedded in the foundation of the steel column are bent until they are close to the steel column, and then welded to ensure that there is no misalignment between the steel column and the foundation; after the anchor steel bar connection is completed, the template is installed around the bottom of the steel column base, and then the bearing is grouted and sealed with bearing grouting material with a height of not less than C50 to ensure that there is no gap between the steel column and the base.

[0039] Step 11, unloading the sling and sling; After the steel column is firmly fixed, loosen the hook of the car crane, and manually pull the cable tied to the sling, so that the steel wire rope tied to the steel column can slide down along the hole of the steel column sling and loosen it. The sling can fall freely to the ground, and the construction workers can loosen the sling and lifting wire rope on the steel column on the ground, so as to easily unload the steel column sling.

[0040] When pulling down the cable tied to the sling, try to reduce the angle between the cable and the steel column, so that it is easier to ensure that the steel column sling is detached from the steel column. Pay attention to safety during the process of unloading the wire rope, wear a safety helmet and protective gloves to prevent the wire rope, sling and other hard materials from hitting the head and causing injuries, and avoid burrs on the wire rope from piercing your fingers during operation.

[0041] The principle of the present invention is: The steel column hoisting system mainly includes 25t truck crane, wire rope, U-shaped clamp, self-made sling, rope, etc. The self-made sling is used to clamp the steel column, and the wire rope is passed around the other half of the steel column. The wire rope and the sling are fixed together through the U-shaped clamp. When the wire rope and the self-made sling are lifting the steel column, the steel column automatically tightens the wire rope under the action of gravity, forming a trend that the heavier the weight of the lifting object, the higher the degree of locking of the sling on the steel column, and the steel column is successfully lifted. The size of this sling is particularly important during the manufacturing process. The size of the sling will affect the verticality of the lifting steel column, the degree of locking of the lifting, the difficulty of unhooking, etc. As shown in the figure, when the sling is made, the inner diameter should be slightly larger than the outer diameter of the steel column by 2-3cm, and slightly open outward to facilitate unhooking; the two wire rope holes on both sides of the sling should be located on the diameter of the inner diameter of the sling, so as to ensure that the steel pipe column can be in a vertical state during lifting. When the steel column is lifted into place and firmly fixed to the foundation to ensure that it will not tilt or overturn after unhooking, the operator drags the cable tied to the sling, and the steel column lifting wire rope and the sling can slide along the steel column to the ground, and then loosen the U-shaped clamp to carry out the lifting work of the next steel column. Example

[0042] The East Extension of Xinyang Street and its supporting facilities in Yangqu County, Taiyuan City, crosses the Beitongpu Railway Bridge: Project Overview: The eastern extension of Xinyang Avenue is a main urban road in the core area of ​​Yangqu County. It starts from Shouyi Road in the west and ends at Shuangyang Road in the east. The road runs east-west, and an overpass scheme is adopted at the Yangqu railway station node.

[0043] The total length of the upper span bridge is 540m, with a design mileage range of K1+345.726~K1+885.726. The main bridge adopts a (2x150)m single-tower cable-stayed bridge with a bridge width of 26.18m, and the approach bridge adopts a continuous box girder with a bridge width of 19~26.18m. The span arrangement is: (2×43)m continuous box girder + (2×39)m continuous box girder + (2×150)m single-tower cable-stayed bridge + (2×35)m continuous box girder. The bridge deck has a bidirectional 1.5% transverse slope. The bottom transverse slope of the cast-in-place beam of the approach bridge is the same as that of the bridge deck, and the bottom transverse slope of the cast-in-place beam of the main bridge is 0.

[0044] The main beam is divided into six sections according to the construction method, namely, section 0# at the main tower, general cast-in-place sections 1#~4#, cast-in-place section 6# at the side pier, and section 5# after rotation. The section lengths are 26m for section 0#, 31.5m for sections 1#~3#, 35m for section 4#, 2.5m for section 6# at the closing section, and 4.55m for section 5# at the side pier.

[0045] The rotating beam section is first constructed on the slope between the existing Beitongpu Railway and the Zhongshe Reservoir parallel to the direction of the railway by constructing support piles and support foundations, setting up steel pipe support columns and disc buckle frames to cast-in-place main beams and hanging cables, and then rotating 32 degrees clockwise to connect with the cast-in-place sections at the side piers on both sides. The location of the cast-in-place beam of the main bridge has been soaked in reservoir water for a long time, the groundwater level is high, the soil quality is poor, and the bearing capacity is weak. According to the design requirements, the overall design of the main bridge support is: support piles + reinforced concrete support foundation + 609 steel pipe support columns + double rows of 56C I-beams + 1.5m Bailey beams + 14 I-beam distribution beams + disc buckles + 14 I-beam cross beams.

[0046] Application effect: This method was used to install the cast-in-place steel columns of the cable-stayed ladder bridge over the Beitongpu Railway in the second section of the east extension of Xinyang Street in Yangqu. It simplified the previous processes and methods, made them more convenient and easy to operate. All the construction workers worked on the ground, avoiding the dangers brought by high-altitude operations, reducing the number of personnel and machinery, avoiding the need for leveling the site for one-time use, and reducing the invisible construction investment and construction costs. At the same time, the construction speed has also been improved, and the application effect is good. It is advisable to continue to study, optimize and promote the application.

Claims

1. A cast-in-place beam steel column support rapid lifting sling and lifting process, characterized in that: The following steps are involved: Step 1: Construction preparation: Site preparation, steel column foundation construction, steel column material delivery, lifting equipment delivery, and material delivery acceptance; Step 2: Measure foundation elevation; After the construction of the concrete strip foundation is completed, before the steel columns are installed, the actual elevation of the installation position of the strip foundation steel columns needs to be re-measured, and the elevation error should be less than 5mm; Step 3: Process the top surface of the foundation; Level the top surface of the foundation, clean the soil on the top surface of the foundation, and straighten the anchor steel bars; Step 4: Measure the length of the steel column; There are different degrees of deviation in the use of steel columns, and with the ups and downs of the terrain, the top elevations of the strip foundations at different locations are all different. However, the top surface of the steel column must be adjusted to a horizontal plane to ensure the smooth subsequent construction of the Bailey beam, the buckle frame, etc. Therefore, when installing the steel column, it is necessary to adjust the length of the steel column according to the foundation elevation. After the steel column is put into the site, the actual length of the steel column is adjusted through the adjustment section of the steel column according to the foundation elevation and the control elevation of the top of the steel column; Step 5: Make the sling; According to the outer diameter of the steel column, the weight of the connecting flange of the steel column, and the safety factor of 1.2 times, combined with the shape of the hanger, it is calculated that the hanger is made on-site using a steel plate with a thickness of t=20mm. The hanger structure is semicircular, with round holes at both ends and a connecting ear plate in the middle. Step 6: Support the lifting machinery; For steel column installation, a 25t truck crane is used for lifting and hoisting operations; the site should be prepared in advance. When the truck crane is parked, after all the legs are erected, the truck crane should be on a horizontal plane, and sleepers must be laid at the bottom of all the legs; Step 7: Installation of slings and slings; During hoisting, pass the hoisting wire rope around the front end of the steel column to be installed and connect the hoisting wire rope to the hoisting device through the U-shaped clamp ring, and hang it on the hook of the truck crane. The wire rope wrapped around the front end of the steel column is in close contact with the flange of the steel column. After the U-shaped clamp ring is installed, the U-shaped ring can move freely during the hoisting process; Step 9: Lift the steel column; After the lifting conditions are met, the steel column is lifted; when the crane is lifting, the wire rope is automatically tightened under the tension of the steel pipe's own weight, and together with the lifting device, it tightly holds the steel column and is then lifted; Step 10: Fix the steel columns; After the steel column is moved to the installation position, the crane is commanded to adjust the installation position of the steel column and ensure the verticality of the steel column. The installer installs a magnetic level ruler on the side wall of the steel column to determine the verticality of the steel column, and uses a crowbar and a wedge-shaped steel plate to fine-tune the steel column to ensure the verticality of the steel column; after the adjustment is in place and meets the requirements, the anchor steel bars embedded in the foundation of the steel column are bent until they are close to the steel column, and then welded to connect. After the anchor steel bars are connected, the template is installed around the bottom of the steel column base, and then the support is grouted and sealed with a support grouting material with an elevation of not less than C50 to ensure that there is no gap between the steel column and the base; Step 11, unloading the sling and sling; After the steel column is firmly fixed, release the hook of the truck crane, manually pull the cable tied to the sling, and the steel wire rope tied to the steel column will slide down along the hole of the steel column sling and release it, and the sling will fall freely to the ground; completing one lifting.

2. The cast-in-place beam steel column support rapid lifting sling and lifting process according to claim 1, characterized in that: The manual pulling of the cable tied to the sling can reduce the angle between the cable and the steel column as much as possible when the cable tied to the sling is pulled down, so that the steel column sling can be more easily separated from the steel column.

3. The cast-in-place beam steel column support rapid lifting sling and lifting process according to claim 1, characterized in that: If the actual elevation is remeasured and exceeds the elevation error, measures need to be taken in advance to process the concrete surface of the steel column foundation. If the concrete surface elevation is uneven or exceeds the allowable error, the concrete surface needs to be chiseled off, or steel columns that can meet the actual construction needs need to be made to cope with the actual support column foundation elevation. If the top elevation of the strip foundation is low, self-compacting concrete pouring, steel plate padding, or steel columns of equivalent length can be made according to the actual elevation.

4. The cast-in-place beam steel column support rapid lifting sling and lifting process according to claim 1, characterized in that: The diameter of the lifting wire rope is 20mm. If it is too thick or too thin, it will be unfavorable for lifting. If it is too thick, the wire rope will be easily stuck by the clamp and difficult to remove; if it is too thin, the safety factor is not high and it is easy to break.

5. The cast-in-place beam steel column support rapid lifting sling and lifting process according to claim 1, characterized in that: The width of the site treatment should be at least one meter wider than the width of the car crane legs. If it is backfill soil, the original site should be excavated at least 30cm and then leveled and compacted. After the treatment is completed, a 30cm thick layer of crushed stone should be laid, or a 20cm thick C20 concrete should be hardened to improve the bearing capacity of the site foundation.

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