Wind power prefabricated steel-concrete tower assembly construction method

Abstract

The present invention discloses a method for assembling and constructing a prefabricated steel-concrete tower for wind power generation. The prefabricated steel-concrete tower includes a concrete tower spliced ​​ring segment, a concrete tower full-circular ring segment, and a steel tower conversion segment. The tower is composed of spliced ​​ring segments, full-circular ring segments, and a steel tower conversion segment from bottom to top. The construction method includes the process of assembling the prefabricated steel-concrete tower through concrete tower segment assembly construction, concrete tower and steel tower conversion segment hoisting construction, and concrete tower prestressing construction. The present invention uses crawler crane flow operation to complete the assembly and assembly of the concrete tower, and adopts non-bonded prestressing construction of the concrete tower outer cable to connect the wind turbine foundation, the concrete tower, and the steel conversion segment, which significantly shortens the construction period. In addition, by optimizing the construction process, the rapid installation of prefabricated cylinder segments is achieved, which speeds up the construction progress and reduces the construction cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to an assembly construction method for a wind power assembled steel-concrete tower. Background Art

[0002] As global demand for renewable energy continues to grow, the wind power industry is also developing rapidly. Wind turbine concrete towers are a crucial component of wind farm construction and play a key role in ensuring the efficiency and safety of wind power generation. Improving construction efficiency and reducing construction costs have long been challenges.

[0003] Patent document CN115306645A discloses a method for installing and constructing a concrete tower for wind power generation, which uses factory prefabrication and centralized assembly methods. The method includes prefabricating semi-circular C-shaped concrete tower segments, centralized assembly of the mixed tower segments, installation of accessories within the mixed tower segments, on-site transportation of the mixed tower segments, hoisting and positioning of the first mixed tower segment, hoisting and positioning of the remaining O-shaped mixed tower segments, hoisting and positioning of the steel transition segments, prestressing of the mixed tower segments, and overall inspection and acceptance. The method utilizes modular prefabrication to create a structure that is easy to stack, transport, and install. The structure is divided vertically and horizontally into segments. Semi-circular C-shaped concrete segments are prefabricated and then assembled on-site into O-shaped mixed tower segments. The installation method utilizes segment-by-segment hoisting, staggered installation, and circumferential jointing. After installation, the entire concrete tower assumes a towering frustum. The prestressed structure, combined with the steel transition segment and the permanent foundation platform of the wind turbine, forms a sturdy support tower for the wind turbine, improving the installation quality and safety of the concrete tower.

[0004] The above method requires the steel strand to pass through the tower wall, and the construction steps of the steel strand will be more time-consuming; at the same time, this method requires grouting of the prestressed duct after the steel strand is tensioned, which is not convenient for the replacement of the steel strand in the later stage; during the construction of this method, epoxy resin is used at the top of the tower pipe section, and in this application, seat slurry is used on the top of the tower pipe section, which has higher strength than epoxy resin; in this method, only the bottom tower pipe section uses grouting parts, while the steel-concrete tower of this application uses a large number of grouting parts, which can improve the service life.

[0005] Patent document CN118346530 A discloses a single steel plate-concrete composite tower structure and its construction method. The tower comprises a body, which is axially assembled from several composite segments, with the diameter of each segment decreasing from bottom to top. Adjacent composite segments are assembled using mortise and tenon flange joints. Each composite segment is circumferentially assembled from several single steel plate-concrete composite shells, which are fastened together using bent bolts. The mortise and tenon flange joints comprise an upper flange plate with several tenons, a lower flange plate with several grooves, and high-strength bolts.

[0006] Although the above patent discloses a multi-section tower structure, it is different from the tower structure composed of segmented ring segments, circular ring segments and transition stages used in this application, and the construction method is also different. The patent does not involve the technical content of tensioning construction. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a wind power prefabricated steel-concrete tower assembly construction method.

[0008] The present invention is achieved through the following technical solutions.

[0009] The present invention provides a method for assembling a prefabricated steel-concrete tower for wind power generation. The prefabricated steel-concrete tower includes a spliced ​​ring segment, a full-circular ring segment, and a transition segment. The spliced ​​ring segment is connected to the transition segment via the full-circular ring segment. The construction method includes assembling the prefabricated steel-concrete tower through concrete tower segment assembly, concrete tower and transition segment hoisting, and concrete tower prestressing.

[0010] The spliced ​​ring segments include segments A and B, and the concrete tower segment assembly construction includes the following steps:

[0011] S1: After leveling the construction site, set up a crane and use the crane to lay the leveling pads. The leveling pads are placed symmetrically along the circumference of the tower. The leveling pads are placed at both ends and the middle of the bottom of the splicing ring.

[0012] S2: Screw the universal lifting ring into the embedded part of the lifting point of segment A, hang one end of the lifting belt A on the main lifting hook of the crane, and connect the other end to the universal lifting ring through the bow shackle. Lift the crane hook and lift segment A onto the leveling pads that have been placed.

[0013] S3: Repeat step S2, lift segment B and place it on the already placed leveling pads and remove the lifting points; set a laser line marker at the center of the tower, and determine the height difference between the bottom surfaces of segments A and B by the position of the laser line on the two segments. Place three sets of assembly tools next to the leveling pads below segment B, and place a hydraulic jack A in each assembly tool. Use hydraulic jack A to support the splicing ring, maintain a gap between the splicing ring and the leveling pads, and adjust the height of the leveling pads according to the height difference between segments A and B.

[0014] S4: Use hydraulic jack B to adjust the position of hydraulic jack A by assembling the tooling to adjust segment B so that the end surface of segment B on the side close to segment A is parallel to the contact surface of segment A;

[0015] S5: Apply epoxy adhesive to the contact surfaces of slices A and B with a thickness of 2 mm. After application, use hydraulic jack B to adjust the position of hydraulic jack A through the assembly tooling so that the end faces of slices B and A are aligned. Bolts are then screwed into the screw holes on slices B and A to secure them.

[0016] S6: Check whether the bolt torque value meets the requirement of 450 N·m. Use a tape measure to check whether the tower diameter meets the construction requirements. Check whether the flatness of the upper and lower surfaces of segments A and B meets the requirement of ≤3mm.

[0017] After the assembly of segments A and B is completed, check whether the epoxy adhesive at the vertical joints is full and perform grouting. If the vertical joints are uneven after the epoxy adhesive is cured, they need to be polished. For misalignment after assembly and sagging caused by the curing of the epoxy resin adhesive on the bottom, use grinding. The chamfers at the joints of the inner walls of segments A and B are smoothed with epoxy resin adhesive.

[0018] Preferably, the hydraulic jack A is a 50t hydraulic jack, and the hydraulic jack B is a 10t hydraulic jack;

[0019] In step S4, the end surface of slice B on the side close to slice A is parallel to the contact surface of slice A and is spaced 15-25 cm apart.

[0020] Preferably, the concrete tower and transition section hoisting construction includes the following steps:

[0021] S1: Screw the universal lifting ring into the embedded part of the tower lifting point. Connect the other end of the universal lifting ring to the lifting belt B through the bow shackle. Hang the lifting belt B into the crane hook. Lift the entire ring with the crane hook and hang it at a suitable height.

[0022] S2: Clean the grooves of the tower foundation to ensure that the surface is moist during hoisting, but there is no water accumulation in potholes. Clean the bottom surface and inner and outer sides of the tower to ensure that there are no dirt and other pollutants on the bottom surface and inner and outer sides. After the flushing is completed, avoid large water droplets adhering to the bottom surface.

[0023] S3: Carry out the first trial lift before proceeding with the hoisting;

[0024] S4: After the first section of the tower is hoisted into place, the intersection of the inner and outer sides of the bottom of the first section of the tower and the top of the tower foundation must be pressed into a sloped surface with the inner side higher and the outer side lower, with a height difference of 5-8mm. After the first section of the mixed tower is hoisted, the grounding installation of the grading ring of the first section of the tower and the tower foundation must be completed in a timely manner. Before installation, the grounding embedded parts need to be polished and coated with conductive paste. After installation, the grounding screws must be treated with anti-corrosion and marked with anti-loosening lines.

[0025] S5: Hoist the intermediate concrete tower section between the first tower section and the steel tower transition section: Connect the steel wire rope to the lifting point of the operating platform through the bow shackle. Install the safety hanging point and anti-fall rope before the tower is lifted. Start the crane and hoist the operating platform into the first tower section. Secure the six lugs of the operating platform to the embedded parts of the tower with bolts. After installation, rotate the winch on the platform so that the hook is above the ground mixer. Connect the hook to the ash hopper and place it on the ground mixer.

[0026] S6: Measure flatness and leveling. Clean the top surface of the first section of the tower, place a leveling meter, and measure the flatness of the top surface of the tower top leveling embedded parts and the limit embedded parts plate, and calculate the difference. Based on the measured data, add a 10mm thick leveling shim relative to the highest point at the measuring point. The remaining points need to be leveled with leveling shims according to the difference.

[0027] S7: Mix the seat slurry, put the seat slurry into the mixer, and pour the weighed water into the mixer until it is evenly mixed and there is no granular residue in the mixer. The mixing time is 6 to 8 minutes. After the mixing is completed, pour the seat slurry into the hopper connected to the winch and lift it to the top surface of the tower. Make test blocks with the remaining seat slurry in the mixer.

[0028] S8: When the seat slurry is lifted to the top surface of a section of the tower, it needs to be spread in time. One person controls the winch and hopper on the operating platform to spread the slurry as the winch rotates along the circumference of the tower. Then, one person spreads and arranges the laid seat slurry to prevent the seat slurry from flowing along the tower wall to the ground, causing waste. There should be no seat slurry on the top of the leveling gasket.

[0029] S9: Lift the tower, screw the universal lifting ring into the embedded part of the tower lifting point, connect the other end of the universal lifting ring to the lifting belt B through the bow shackle, and hang the lifting belt B into the crane hook. At the same time, screw the positioning pin on the top of the tower section into the corresponding embedded hole; start the crane, lift the tower to the appropriate height, clean the bottom and sides of the tower, and clean it with a high-pressure water gun after cleaning; then lift the concrete tower to the top of the tower that has been hoisted, and hover it on one side. Wait until the grouting is completed before starting alignment;

[0030] S10: Start the crane to lift a section of the tower to the top of the completed tower, and determine the direction of the door opening of this section of the tower according to the tower joint position, the position of the limit pin shaft or the position of the arc beam embedded part; then lower the tower section and hover it when it is 8-11 cm away from the top of the positioning pin shaft, place the rubber pad on the surface of the tower that has been hoisted, and rotate the tower to ensure that the limit pin shaft can be placed in the limit hole of this section without being damaged; then slowly lower the tower section to seat the mortar, and remove the rubber pad after the positioning pin holes are aligned; then scrape off the excess seating mortar, and use the scraped seating mortar to repair the loose parts of the seating mortar, and press the joints tightly;

[0031] S11: Lift the inner operating platform. Start the crane and slowly lower the hook. Connect the wire rope to the platform's lifting point using a bow-shaped shackle. Remove the lug plate at the connection between the inner operating platform and the tower. Operate the main crane to lift the inner operating platform. Stop the crane when it reaches the desired position. Fix the lug plate to the tower's embedded parts with bolts. Remove the wire rope at the inner operating platform's lifting point. Remove the universal lifting ring at the top of the tower after the verticality measurement is qualified.

[0032] S12: Lift the conversion section.

[0033] Preferably, the first trial hoisting comprises the following steps:

[0034] S1: Check whether the vertical surfaces on both sides of the tower foundation groove are vertical and whether the top surface of the tower foundation groove concrete is not higher than the surface of the limit embedded steel plate;

[0035] S2: Clean the garbage on the top surface of the tower foundation groove and sprinkle water to moisten it;

[0036] S3: Use a laser leveling instrument to re-measure the top surface of the leveling embedded part, and use leveling shims to adjust the flatness according to the measurement results. The thickness of the leveling shims should be 10mm higher than the highest point measured, and the remaining points should be level with it;

[0037] S4: Place the positioning pin;

[0038] S5: Start trial lifting and determine the direction of the door opening based on the position of the positioning pin, the position of the joint, and the position of the cable embedded parts;

[0039] S6: Use a crane to place the first section of the tower in the groove of the tower foundation, and ensure that the edge of the tower does not collide with the groove of the tower foundation. The positioning pin shaft is normally inserted into the limit hole of the first section of the tower, and the trial lifting is completed.

[0040] Preferably, the hoisting comprises the following steps:

[0041] S1: Lift the first section of the tower after the trial hoisting and suspend it on one side of the tower foundation, 10-20 cm above the ground;

[0042] S2: Start mixing the slurry;

[0043] S3: After the seat slurry is mixed, the seat slurry is spread. The paving thickness is kept uniform to prevent the seat slurry from dripping onto the leveling pads.

[0044] S4: After the slurry is spread, the first section of the tower is hoisted.

[0045] Preferably, the hoisting of the conversion section includes the following steps:

[0046] S1: Install the lifting device into the lifting hole of the flange on the transition section and connect it to the crane hook through the lifting strap and bow shackle;

[0047] S2: Start the crane to lift the transition section to the top of the completed top tower section, and apply sealant to the inner and outer sides of the top surface of the top tower section and around the prestressed holes in the circumferential direction. When the transition section is lifted to the top of the mixed tower, apply sealant to the inner and outer sides of the lower flange of the transition section and around the prestressed holes in the circumferential direction.

[0048] S3: Slowly lower the hook to 8-11 cm from the top of the locating pin, determine the direction of the door opening according to the position of the locating pin hole, rotate the conversion section until the locating pin and the hole are aligned up and down, then lower the large hook to complete the installation of the conversion section, and then stick a chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveler to measure the flatness of the top surface of the conversion section.

[0049] Preferably, the prestressed concrete tower construction includes the following steps:

[0050] S1: Hoist the inclined anchors and fall chains to the transition section, and number the prestressed ducts in the tower foundation in a counterclockwise order starting from the tower door;

[0051] Set up the cable tray;

[0052] Winch installation;

[0053] S2: Install the pulley assembly: Fix pulley No. 1 to the door frame below the tower door; fix pulley No. 2 to the right side of the tower door entrance; fix pulley No. 3 to the position of prestressed channel No. 1 on the foundation cover plate. Pulley No. 3 moves with the position of the steel strand bundle threading hole; these three pulleys are used to guide the lifting direction of the steel strand; fix pulley No. 4 to the curved beam of the second-floor platform; fix pulley No. 5 to the elevator of the second-floor platform; these two pulleys are used to pass the wire rope;

[0054] S3: Install the nylon rope and wire rope: Pass the nylon rope through the lower hook of the fall chain, drop one end of the nylon rope from the ladder to the tower foundation cover, then tie the other end of the nylon rope to the eye, and tie the end of the wire rope to the eye. Pass the wire rope through the No. 4 and No. 5 pulleys in sequence, connect it to the nylon rope eye at the elevator, and lift the wire rope. After the wire rope reaches the predetermined height, untie the connecting eye and secure the nylon rope to the fall chain. Pass the wire rope and its eye through another fall chain and through the corresponding prestressed hole. Start the winch and slowly lower it to the second-floor platform along the gap between the outer side of the platform and the inner wall of the tower.

[0055] S4: First channel threading: When the steel wire rope drops to the second-floor platform, pass the steel wire rope through the No. 3, No. 2, and No. 1 pulleys and rubber sleeves in sequence, and connect and secure the lifting ring to the steel strand pier head on the outer cable drum; start the winch to lift the steel strand to the top of the steel tower conversion channel; after the inclined anchor is fixed, pass another sling from left to right through the anchor and fix it to the lower hook of the fall chain to release the open anchor, rotate the fall chain to drop the steel strand to the channel; finally, pull out the sling;

[0056] S5: After the stranding is completed at this hole, move the fall chain and pulley No. 3, repeat steps 3 and S4, and sequentially lift the steel strands of the remaining holes No. 2 to No. 18 at this location. After the stranding is completed at hole No. 18, hoist the cable tray to the right, move the fall chain, pulleys No. 2, No. 3, and No. 5 to their symmetrical sides, and repeat steps 2 to S4 to complete the stranding of the remaining steel strands.

[0057] S6: After the upper steel strands are bundled, insert the corresponding steel strands into the bell mouth of the tower base cover according to the hole position. After all the steel strands are inserted into the tower base, check the contamination and length of the steel strands in turn. If the distance from the ground is less than 400mm, the steel strands need to be peeled and the excess part needs to be cut off.

[0058] S7: After all steel strands are bundled, the concrete strength of the tower section reaches 100% of the design strength and the base slurry strength reaches 60MPa before tensioning can be carried out;

[0059] Before installing the flat anchor, check whether the concrete at the bell mouth is dense. When the concrete meets the tensioning requirements, spread out the steel strands in each prestressed channel and align the nine steel strands with the nine holes on the flat anchor. Lift the flat anchor from the bottom of the steel strands to the bell mouth and fit it tightly with the concrete at the bell mouth. Then insert the clips into the nine holes of the flat anchor to secure each steel strand.

[0060] S8: Perform jack tensioning;

[0061] S9: Anti-corrosion treatment: After the tensioning is completed and accepted, reserve 700mm of prestressed steel strand exposed from the lower node anchorage and reserve no less than 350mm of prestressed steel strand exposed from the upper node anchorage, cut off the excess part, and clean the tensioning end;

[0062] Fill the center holes of the upper and lower anchors with foam glue; smear and cover the anchors and exposed steel strands with anti-corrosion grease; finally, cover and secure the anchors and exposed steel strands with corresponding anchor covers;

[0063] After the anchoring is completed, inject cement slurry into the lower anchoring cover; inject cement slurry into the anchoring cover along the bell mouth of the foundation cover to a height of 400~600mm.

[0064] Preferably, in step S8, the jack tensioning step includes: inserting the limit plate from the lower part of the steel strand and fitting it tightly with the flat anchor, inserting the four jack sleeves from the end of the steel strand in sequence according to the numbers 1-10-19-28, lifting the jack to the limit plate and fitting it tightly, tensioning is performed using four-point symmetry, and tensioning the steel strands in the four holes in the order of the numbered holes 1-10-19-28. After the tensioning of the steel strands in the hole is completed, The four tensioning points rotate 45 degrees counterclockwise to start tensioning the steel strands in holes numbered 5-14-23-32. Similarly, tension the steel strands in the remaining holes in the order of 2-11-20-29, 6-15-24-33, 3-12-21-30, 7-16-25-34, 4-13-22-31, 8-17-26-35, and 9-18-27-36.

[0065] Preferably, in step S8, during the tensioning process, the tensioning force of each steel strand is 188.2 kN, and the tensioning is controlled according to the data converted by the jack and the pressure gauge; after the oil pump is started, the pressurization is stopped at 30%, 55%, 80%, and 105% of the standard pressure value;

[0066] After each tensioning, measure the elongation value and record it, then put the jack back and continue to apply pressure. If the steel strand is less than 50mm from the ground during the tensioning process, part of the steel strand needs to be cut off to ensure smooth tensioning.

[0067] Repeat the jack tensioning steps until the design tensioning force is reached and hold the load for 2 minutes.

[0068] The beneficial effects of the present invention are:

[0069] The present invention uses crawler cranes for continuous operation to complete the assembly and assembly of the concrete tower, and uses non-bonded prestressed concrete tower cables to connect the wind turbine foundation, concrete tower, and steel transition section, significantly shortening the construction period. In addition, by optimizing the construction process, the rapid installation of prefabricated cylinder sections is achieved, which speeds up the construction schedule and reduces construction costs. The prefabricated steel-concrete tower of the present invention has good mechanical properties. At the same time, the steel strands have no fixed contact with the inner wall of the tower, which facilitates the replacement of the steel strands and reduces the requirements for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is a flowchart of the concrete tower segment assembly construction of the present invention;

[0071] Figure 2 This is a flow chart of the concrete tower and transition section hoisting construction of the present invention;

[0072] Figure 3 This is a flow chart of the prestressed concrete tower construction process of the present invention;

[0073] Figure 4 It is a schematic diagram of the leveling gaskets and splicing rings in the concrete tower segment assembly construction of the present invention;

[0074] Figure 5 It is the numbering diagram of the prestressed duct of the present invention;

[0075] Figure 6 It is a schematic diagram of steel strand lifting of the present invention;

[0076] In the figure: 1-leveling gasket, 2-slice A, 3-slice B. DETAILED DESCRIPTION

[0077] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0078] Example:

[0079] like Figures 1 to 6 As shown, a wind power prefabricated steel-concrete tower assembly construction method, the prefabricated steel-concrete tower includes concrete tower spliced ​​ring segments, concrete tower full-circular ring segments and steel tower conversion segments, the tower from bottom to top is composed of spliced ​​ring segments, full-circular ring segments and steel tower conversion segments, the construction method includes the process of assembling the prefabricated steel-concrete tower through concrete tower segment assembly construction, concrete tower and conversion segment hoisting construction and concrete tower prestressing construction.

[0080] Sections 1-31 of the prefabricated steel-concrete wind turbine tower are concrete, with section 32 serving as the steel tower transition section. Sections 1-16 are spliced ​​ring segments, while sections 17-31 are full-circular ring segments. Sections 1-31 stand 112 meters tall, while the steel tower transition section stands 113.48 meters tall. A 220T crawler crane was used to assemble the concrete tower segments, while a 650T crawler crane was used to hoist sections 1 through 31 and the steel tower transition section.

[0081] The spliced ​​ring segments include segments A2 and B3, which are C-shaped. The concrete tower segment assembly construction includes the following steps:

[0082] S1: After leveling the construction site, set up a crane. Manually hang one end of the sling A into the crane's hook. Use a bow-shaped shackle to connect the sling A to the hook at the other end. Hang the hook into the lifting lug of the concrete leveling pad 1. Use the crane to lay the concrete leveling pad 1. Place 6 leveling pads 1 symmetrically along the circumference of the tower. Place the leveling pads 1 at both ends and the middle of the bottom of the splicing ring.

[0083] S2: Manually climb to the top of tower segment A2 using a ladder and screw the universal lifting ring into the embedded part of segment A2's lifting point to a depth of no less than 85 mm. Hang one end of the lifting belt A to the main hook of the crane and connect the other end to the universal lifting ring with a bow shackle. After that, personnel evacuate, slowly lift the crane hook and lift segment A2 onto the already placed leveling pad 1. After placement, manually remove the lifting point.

[0084] S3: Repeat step S2, lift segment B3 and place it on the already placed leveling gasket 1 and remove the lifting point; set a laser line marker at the center of the tower, and determine the height difference between the bottom surfaces of segments A2 and B3 by the position of the laser line on the two segments. Place three sets of assembly tools next to the leveling gasket 1 below segment B3, and place a 50t hydraulic jack A in each assembly tool. Use the 50t hydraulic jack A to support the splicing ring segment, maintain a gap between the splicing ring segment and the leveling gasket 1, and adjust the height of the leveling gasket 1 according to the height difference between segments A2 and B3;

[0085] S4: Use 10t hydraulic jack B to adjust the position of 50t hydraulic jack A by assembling the tooling to adjust segment B3 so that the end surface of segment B3 on the side close to segment A2 is parallel to the contact surface of segment A2, and there is a gap of 15-25cm between them.

[0086] S5: Use a plastering knife and a plastering board to apply epoxy adhesive to the contact surfaces of slices A2 and B3. Use Bolicon PJ10 epoxy adhesive. Keep the contact surfaces clean and dry when applying, and avoid applying to bolt holes. Apply to a thickness of 2mm. After application, use a 10t hydraulic jack B to adjust the position of a 50t hydraulic jack A through the assembly tooling so that the end faces of slices B3 and A2 are aligned. Use M30 straight bolts to screw into the screw holes on slices B3 and A2 to secure them.

[0087] S6: Use a torque wrench to check whether the bolt torque value meets the requirement of 450 N·m. Use a tape measure to check whether the tower diameter meets the construction requirements. Also check whether the flatness of the upper and lower surfaces of segments A2 and B3 is ≤3mm.

[0088] After the assembly of segments A2 and B3, check whether the epoxy adhesive at the vertical joints is full and perform grouting. If the vertical joints are uneven after the epoxy adhesive is cured, they need to be manually polished with a handheld grinder. For misalignment after assembly and sagging caused by the curing of the epoxy resin adhesive on the bottom surface, use an angle grinder to smooth it out. The chamfers at the joints of the inner walls of segments A2 and B3 are smoothed with epoxy resin adhesive.

[0089] The concrete tower and transition section hoisting construction includes the following steps:

[0090] S1: Manually screw four universal lifting rings into the embedded parts of the tower lifting points. The other ends of the four universal lifting rings are connected to four 9-meter-long 30t lifting straps B through bow-shaped shackles. The lifting straps B are then hung in the crane hook. The crane hook is raised to lift the entire ring and suspend it at an appropriate height.

[0091] S2: Use a high-pressure water gun to clean the grooves of the tower foundation, ensuring that the surface is moist during hoisting, but there is no water accumulation in potholes. Use a high-pressure water gun to clean the bottom surface and inner and outer sides of the tower to ensure that there are no contaminants such as mud on the bottom surface and inner and outer sides. After the flushing is completed, avoid large water droplets adhering to the bottom surface;

[0092] S3: Carry out the first trial lift before proceeding with the hoisting;

[0093] S4: After the first section of the tower is hoisted into place, the intersection of the inner and outer sides of the bottom of the first section of the tower and the top of the tower foundation must be manually smoothed and pressed with a plastering knife to form a sloped surface with the inner side higher and the outer side lower, with a height difference of 5-8mm. After the first section of the tower is hoisted, the grounding installation of the grading ring of the first section of the tower and the tower foundation must be completed in a timely manner. Before installation, the grounding embedded parts need to be polished and coated with conductive paste. After installation, the grounding screws must be treated with anti-corrosion and marked with anti-loosening lines.

[0094] S5: Hoist the intermediate concrete tower section between the first tower section and the steel tower transition section: Manually connect four steel wire ropes to the four lifting points of the operating platform through bow-shaped shackles. Install the safety hanging points and anti-fall ropes before the tower is lifted. Start the crane and hoist the operating platform into the first tower section. Manually climb onto the operating platform using a ladder and use an electric wrench to fix the six lugs of the operating platform to the tower embedded parts with M20 high-strength bolts. After installation, turn the winch on the platform so that the hook is above the ground mixer, and slowly lower the hook, connected to the ash hopper, to the ground mixer.

[0095] S6: Measure flatness and perform leveling. Use a broom, spray bottle (mist type), or other tools to clean the top surface of the first section of the tower to ensure that there is no debris, loose soil, or other debris on the top surface. Manually place a leveling instrument and measure the top surface flatness of the four leveling embedded parts and two limit embedded parts on the top surface of the tower, and calculate the difference. Based on the measured data, add a 10mm thick leveling shim 1 relative to the highest point of the six measuring points. The remaining points must be leveled with leveling shims 1 according to the difference.

[0096] S7: Mix the seat slurry. According to the weight of the seat slurry used and the mixing ratio required by the manufacturer, weigh the required water using an electronic scale. Put the seat slurry into the mixer and pour the weighed water into the mixer until it is evenly mixed and there is no granular residue in the mixer. The mixing time is 6 to 8 minutes. After the mixing is completed, pour the seat slurry into the hopper connected to the winch and lift it to the top surface of the tower. Make a test block with the remaining seat slurry in the mixer. The test block size is 40*40*160 and is made using a steel mold.

[0097] S8: When the seat slurry is lifted to the top surface of a section of the tower, it needs to be spread in time. One person operates the winch on the operating platform, and one person holds the hopper to spread the slurry as the winch rotates along the circumference of the tower. Then one person follows the hopper to spread and organize the laid seat slurry to prevent the seat slurry from flowing along the tower wall to the ground, causing waste. There should be no seat slurry on the top of the leveling gasket.

[0098] S9: Hoist the tower. This step needs to be performed before grouting, depending on the on-site conditions. Manually screw the four universal lifting rings into the embedded parts of the tower lifting points. The other ends of the four universal lifting rings are connected to four 9-meter-long 30t slings B through bow-shaped shackles, and the slings B are hung in the crane hook. At the same time, the locating pins on the top of the tower section are screwed into the corresponding embedded holes. Start the crane and lift the tower to a suitable height. Manually use a spade or shovel to clean the garbage on the bottom and sides of the tower. After cleaning, use a high-pressure water gun to clean it. Then slowly lift the concrete tower to the top of the tower that has been hoisted and hover on one side. Wait until the grouting is completed before starting alignment.

[0099] S10: Start the crane to lift a section of the tower to the top of the completed tower, and determine the direction of the door opening of this section of the tower according to the tower joint position, the position of the limit pin shaft or the position of the arc beam embedded part; then drop the tower section, and hover it when it is 8-11 cm away from the top of the positioning pin shaft, and place 4 rubber pads on the surface of the completed tower. Two people are respectively located at the two positioning pin shafts and start to compare the limit embedded part holes, and the other two people assist in rotating the tower to ensure that the two limit pin shafts can be placed in the limit holes of this section without being damaged; then slowly Slowly lower the tower section to seat the mortar. After the alignment of the positioning pin holes is completed, remove the rubber pads. Then one person uses a plastering knife to scrape off the excess seating mortar. The loose seating mortar is repaired with the scraped seating mortar. The grouting should be pressed compactly. For external grouting, fix the plastering knife with the extension rod and remove the excess seating mortar from the outside from the top (this step needs to be done after the inner operating platform is lifted). If there is any gap, it needs to be repaired manually on the outside with tools such as a hanging basket or seat plate. The external grouting should also be pressed compactly.

[0100] S11: Lift the inner operating platform. Start the crane and slowly lower the hook. Connect the four steel wire ropes to the platform's lifting points using bow-shaped shackles. Remove the lugs at the connection between the inner operating platform and the tower. Operate the main crane to slowly lift the inner operating platform. Stop the crane when it reaches the desired position. Manually secure the six lugs of the operating platform to the tower's embedded parts using high-strength bolts. Remove the steel wire ropes at the inner operating platform's lifting points. Remove the universal lifting rings on the top of the tower after the verticality measurement is qualified.

[0101] S12: Lift the conversion section.

[0102] The first trial hoisting comprises the following steps:

[0103] S1: Check whether the vertical surfaces on both sides of the tower foundation groove are vertical and whether the top surface of the tower foundation groove concrete is not higher than the surface of the limit embedded steel plate;

[0104] S2: Use brooms, shovels and other tools to clean up the garbage on the top surface of the tower foundation groove and sprinkle water to moisten it;

[0105] S3: Use a laser leveling instrument to re-measure the top surface of the leveling embedded part, and adjust the flatness with leveling shim 1 based on the measurement results. The thickness of leveling shim 1 should be 10mm higher than the measured relative highest point, and the remaining points should be level with it;

[0106] S4: Manually place two positioning pins and check whether the positioning pins match the embedded parts and whether the embedded part hole depth meets the design requirements;

[0107] S5: Start trial lifting and determine the direction of the door opening based on the position of the positioning pin, the position of the joint, and the position of the cable embedded parts;

[0108] S6: Use the crane to slowly place the first section of the tower into the groove of the tower foundation, and ensure that the edge of the tower does not collide with the groove of the tower foundation, and the positioning pin shaft normally penetrates into the limit hole of the first section of the tower, and the trial lifting is completed.

[0109] The hoisting comprises the following steps:

[0110] S1: Lift the first section of the tower after the trial hoisting and suspend it on one side of the tower foundation, 10-20 cm above the ground;

[0111] S2: Start mixing the slurry: Strictly follow the water-cement ratio provided by the manufacturer. The mixing time is 6 to 10 minutes, which is subject to the actual situation on site.

[0112] S3: After the seat slurry is mixed, the auxiliary crane is used to spread the seat slurry. The paving thickness is kept uniform to prevent the seat slurry from dripping onto the leveling gasket 1, so as to ensure that the top of the gasket 1 at each leveling embedded position is absolutely level;

[0113] S4: After the slurry is spread, the first section of the tower is hoisted. The hoisting action refers to the steps S4 and S5 of the first section trial hoisting.

[0114] The conversion section hoisting comprises the following steps:

[0115] S1: Manually install the special lifting device for the transition section into the lifting hole on the upper flange of the transition section and connect it to the crane hook through a lifting belt and a bow shackle;

[0116] S2: Start the crane to lift the transition section to the top of the completed top tower section. Use a glue gun to apply sealant on the inner and outer sides of the top surface of the top tower section and around the prestressed holes. When the transition section is lifted to the top of the mixed tower, apply sealant on the inner and outer sides of the lower flange of the transition section and around the prestressed holes.

[0117] S3: Slowly lower the hook to 8-11 cm from the top of the locating pin shaft. Two people determine the direction of the door opening based on the position of the locating pin hole. Two people work together to rotate the conversion section until the locating pin shaft and the hole are aligned up and down. Then lower the large hook to complete the installation of the conversion section. Then stick a chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveler to measure the flatness of the top surface of the conversion section.

[0118] The concrete tower prestressing construction comprises the following steps:

[0119] S1: Hoist the inclined anchors and fall chains to the transition section, and number the 36 prestressed ducts in the tower foundation in the order of 1 to 36 in a counterclockwise direction from the tower door;

[0120] Set up the cable tray: Place the cable tray on the left side of the tower door (diagonally opposite the No. 1 prestressed channel) on the flat ground (make sure the cable tray is flat and not tilted); and hang a whole coil of steel strands on the top of the cable tray for use in threading the wire ropes;

[0121] Winch installation: hoist the winch to the platform at the outer ladder tower door, secure it with steel pipes and ropes, power on the winch and complete the commissioning;

[0122] S2: Install the pulley assembly: Fix pulley No. 1 to the door frame below the tower door; fix pulley No. 2 to the right side of the tower door entrance, that is, on the second-floor platform directly above hole No. 1; fix pulley No. 3 to the position of prestressed hole No. 1 on the foundation cover, and pulley No. 3 moves with the position of the steel strand bundle hole; these three pulleys are used to guide the lifting direction of the steel strand; fix pulley No. 4 to the curved beam on the second-floor platform; fix pulley No. 5 to the elevator on the second-floor platform; these two pulleys are used to pass the wire rope;

[0123] S3: Install the nylon rope and wire rope: Pass the nylon rope through the lower hook of a fall chain, and let one end of the nylon rope fall from the ladder to the tower foundation cover, controlled by two workers below; then tie the other end of the nylon rope to the eye, and let it fall from the elevator to the second-floor platform, and tie the end of the wire rope to the eye. This wire rope passes through the No. 4 and No. 5 pulleys in turn, and is connected to the nylon rope eye at the elevator. Two workers on the bottom floor pull the nylon rope downward and control the winch to lift the wire rope to the 25th section; after the wire rope reaches the predetermined height of the 25th section platform, untie the connecting eye and secure the nylon rope to the fall chain; pass the wire rope and its eye through another fall chain and the corresponding prestressed hole, start the winch and slowly drop it to the second-floor platform along the gap between the outer side of the platform and the inner wall of the tower;

[0124] S4: First channel threading: When the wire rope falls to the second-floor platform, a worker here will pass the wire rope through the No. 3, No. 2, and No. 1 pulleys and rubber sleeves in sequence, and connect and secure the lifting ring to the steel strand pier head on the outer cable drum; start the winch and slowly lift the steel strand to the top of the steel tower conversion section channel; during the lifting process, a worker next to the cable drum needs to use a sickle to cut the cable tie that fixes the steel strand to ensure that there is no obstruction during the lifting of the steel strand; after the inclined anchor is fixed, another lifting belt is used to pass through the anchor from left to right and fixed to the lower hook of the fall chain. The open anchor at 300mm is released, and the fall chain is slowly rotated to drop the steel strand to the channel; finally, the lifting belt is slowly pulled out;

[0125] S5: After the stranding is completed at this hole, move the fall chain and pulley No. 3, repeat steps 3 and S4, and sequentially lift the steel strands of the remaining holes No. 2 to No. 18 at this location. After the stranding is completed at hole No. 18, hoist the cable tray to the right, move the fall chain, pulleys No. 2, No. 3, and No. 5 to their symmetrical sides, and repeat steps 2 to S4 to complete the stranding of the remaining steel strands.

[0126] S6: After the upper steel strands are bundled, four workers insert the corresponding steel strands into the bell mouth according to the hole positions on the tower foundation cover. After all the steel strands are inserted into the tower foundation, one worker checks the contamination and length of the steel strands in turn. If the steel strands are contaminated, they need to be cleaned. If the distance from the ground is less than 400mm, the steel strands need to be peeled and the excess part needs to be cut off with a grinding wheel cutter so that the jack can pass through the steel strands smoothly.

[0127] S7: After all strands are bundled, the bundle-threading equipment shall be lowered from the external ladder in a timely manner; the jack, the pressure gauge, the oil pump and other tensioning equipment shall be hoisted into the foundation; the oil pump oil circuit shall be checked to ensure that it is unobstructed and the circuit is safe; the tower section concrete strength shall reach 100% of the design strength and the base slurry strength shall reach 60MPa before tensioning can be carried out;

[0128] Before installing the flat anchor, check whether the concrete at the bell mouth is dense. When the concrete meets the tensioning requirements, two workers will spread the steel strands in each prestressed channel, aligning the 9 steel strands with the 9 holes on the flat anchor. Lift the flat anchor from the bottom of the steel strands to the bell mouth, and fit it tightly with the concrete at the bell mouth. Then insert the clips into the 9 holes of the flat anchor to secure each steel strand.

[0129] S8: Perform jack tensioning;

[0130] S9: Anti-corrosion treatment: After the tensioning is completed and accepted, reserve 700mm of prestressed steel strand exposed from the lower node anchor and reserve no less than 350mm of prestressed steel strand exposed from the upper node anchor, cut off the excess part with a grinding wheel cutter, and then clean the tensioning end;

[0131] Fill the center holes of the upper and lower anchors with foam glue; smear and cover the anchors and exposed steel strands with anti-corrosion grease; finally, cover and secure the anchors and exposed steel strands with corresponding anchor covers;

[0132] After the anchoring is completed, cement slurry must be injected into the lower anchor cover as soon as possible; the cement slurry should be prepared according to the mix ratio marked by the manufacturer, and the cement slurry should be injected into the anchor cover along the trumpet mouth of the foundation cover to a height of 400~600mm using a grouting machine to ensure that the cement slurry is dense and has no voids.

[0133] In step S8, the jack tensioning step includes: inserting the limit plate from the lower part of the steel strand and fitting it tightly with the flat anchor, inserting the four jack sleeves from the end of the steel strand in sequence according to the numbers 1-10-19-28, lifting the jack to the limit plate and fitting it tightly, tensioning is performed using four-point symmetry, and tensioning is performed in the four holes in the order of 1-10-19-28. After the tensioning of the steel strand in the hole is completed, the four tensioning points are reversed. Rotate 45 degrees clockwise to start tensioning the steel strands in holes numbered 5-14-23-32. At this point, the M-shaped tensioning is completed. Similarly, tension the remaining steel strands in holes numbered 2-11-20-29, 6-15-24-33, 3-12-21-30, 7-16-25-34, 4-13-22-31, 8-17-26-35, and 9-18-27-36.

[0134] In the tensioning process of step S8, the tensioning force of each steel strand is 188.2 kN, and the tensioning is controlled according to the data converted by the jack and the pressure gauge; after the oil pump is started, the pressure is stopped at 30%, 55%, 80%, and 105% of the standard pressure value;

[0135] After each tensioning, measure the elongation value and record it, then put the jack back and continue to apply pressure. If the steel strand is less than 50mm from the ground during the tensioning process, part of the steel strand needs to be cut off to ensure smooth tensioning.

[0136] Repeat the jack tensioning steps until the design tensioning force is reached and hold the load for 2 minutes.

Claims

1. The wind power prefabricated steel-concrete tower assembly construction method is characterized by: The prefabricated steel-concrete tower comprises a concrete tower spliced ​​ring segment, a concrete tower full-circular ring segment, and a steel tower conversion segment. The tower comprises, from bottom to top, the spliced ​​ring segment, the full-circular ring segment, and the steel tower conversion segment. The construction method comprises assembling the prefabricated steel-concrete tower through concrete tower segment assembly, concrete tower and conversion segment hoisting, and concrete tower prestressing. The concrete tower splicing ring segment comprises a segment A (2) and a segment B (3), and the assembly construction of the concrete tower splicing ring segment comprises the following steps: S1: After the construction site is leveled, a crane is set up, and the leveling pads (1) are laid by the crane. The leveling pads (1) are symmetrically placed along the circumference of the tower, and the leveling pads (1) are respectively arranged at the two ends and the middle position of the bottom of the splicing ring; S2: Screw the universal lifting ring into the embedded part of the lifting point of segment A (2), hang one end of the lifting belt A on the main lifting hook of the crane, and connect the other end to the universal lifting ring through the bow-shaped shackle. Lift the hook of the crane and lift segment A (2) onto the leveling pad (1) that has been placed. S3: Repeat step S2, lift and place segment B (3) on the already placed leveling gasket (1) and remove the lifting point; set a laser marking instrument at the center of the tower, determine the height difference between the bottom surfaces of the two segments by the position of the laser line on the segments A (2) and segment B (3), place three sets of assembly tools next to the leveling gasket (1) below segment B (3), place a hydraulic jack A in each assembly tool, and support the splicing ring segment with the hydraulic jack A to keep the splicing ring segment and the leveling gasket (1) spaced apart, and adjust the height of the leveling gasket (1) by the height difference between segment A (2) and segment B (3); S4: Use hydraulic jack B to adjust the position of hydraulic jack A by assembling the tooling to adjust segment B (3) so that the end face of segment B (3) on the side close to segment A (2) is parallel to the contact surface of segment A (2); S5: Apply epoxy adhesive to the contact surface of slice A (2) and slice B (3) with a thickness of 2 mm; after the application is completed, use hydraulic jack B to adjust the position of hydraulic jack A through the assembly tool so that the end face of slice B (3) and slice A (2) fit together, and use bolts to screw into the screw holes on slice B (3) and slice A (2) respectively to tighten them; S6: Check whether the bolt torque value meets the requirement of 450N·m, use a tape measure to check whether the tower diameter meets the construction requirements, and check whether the flatness of the upper and lower surfaces of segment A (2) and segment B (3) meets the requirement of ≤3mm; After the assembly of segments A (2) and B (3), check whether the epoxy adhesive at the vertical joints is full and perform grouting. If the vertical joints are uneven after the epoxy adhesive is cured, they need to be polished. For misalignment after assembly and sagging caused by the epoxy resin adhesive on the bottom during the curing process, smoothing treatment is adopted. The chamfers at the joints of the inner walls of segments A (2) and B (3) are smoothed with epoxy resin adhesive.

2. The wind power prefabricated steel-concrete tower assembly construction method according to claim 1, characterized in that: The hydraulic jack A is a 50t hydraulic jack, and the hydraulic jack B is a 10t hydraulic jack; In step S4, the end surface of the slice B (3) on the side close to the slice A (2) is parallel to the contact surface of the slice A (2) and is spaced 15-25 cm apart.

3. The wind power prefabricated steel-concrete tower assembly construction method according to claim 1, characterized in that: The concrete tower and transition section hoisting construction includes the following steps: S1: Screw the universal lifting ring into the embedded part of the tower lifting point. Connect the other end of the universal lifting ring to the lifting belt B through the bow shackle. Hang the lifting belt B into the crane hook. Lift the entire ring with the crane hook and hang it at a suitable height. S2: Clean the grooves of the tower foundation to ensure that the surface is moist during hoisting, but there is no water accumulation in potholes. Clean the bottom surface and inner and outer sides of the tower to ensure that there are no dirt and other pollutants on the bottom surface and inner and outer sides. After the flushing is completed, avoid large water droplets adhering to the bottom surface. S3: Carry out the first trial lift before proceeding with the hoisting; S4: After the first section of the tower is hoisted into place, the intersection of the inner and outer sides of the bottom of the first section of the tower and the top of the tower foundation must be pressed into a sloped surface with the inner side higher and the outer side lower, with a height difference of 5-8mm. After the first section of the mixed tower is hoisted, the grounding installation of the grading ring of the first section of the tower and the tower foundation must be completed in a timely manner. Before installation, the grounding embedded parts need to be polished and coated with conductive paste. After installation, the grounding screws must be treated with anti-corrosion and marked with anti-loosening lines. S5: Hoist the intermediate concrete tower section between the first tower section and the steel tower transition section: Connect the steel wire rope to the lifting point of the operating platform through the bow shackle. Install the safety hanging point and anti-fall rope before the tower is lifted. Start the crane and hoist the operating platform into the first tower section. Secure the six lugs of the operating platform to the embedded parts of the tower with bolts. After installation, rotate the winch on the platform so that the hook is above the ground mixer. Connect the hook to the ash hopper and place it on the ground mixer. S6: Measure the flatness and leveling, clean the top surface of the first section of the tower, place the leveling instrument, and measure the top surface flatness of the tower top surface leveling embedded parts and the limit embedded parts plate, and calculate the difference; based on the measured data, add a 10mm thick leveling gasket (1) relative to the highest point position at the measuring point, and the remaining points need to be padded with leveling gaskets (1) according to the difference; S7: Mix the seat slurry, put the seat slurry into the mixer, and pour the weighed water into the mixer until it is evenly mixed and there is no granular residue in the mixer. The mixing time is 6 to 8 minutes. After the mixing is completed, pour the seat slurry into the hopper connected to the winch and lift it to the top surface of the tower. Make test blocks with the remaining seat slurry in the mixer. S8: When the seat slurry is lifted to the top surface of a section of the tower, it needs to be spread in time. One person controls the winch and hopper on the operating platform to spread the slurry as the winch rotates along the circumference of the tower. Then, one person spreads and arranges the laid seat slurry to prevent the seat slurry from flowing along the tower wall to the ground, causing waste. There should be no seat slurry on the top of the leveling gasket. S9: Lift the tower, screw the universal lifting ring into the embedded part of the tower lifting point, connect the other end of the universal lifting ring to the lifting belt B through the bow shackle, and hang the lifting belt B into the crane hook. At the same time, screw the positioning pin on the top of the tower section into the corresponding embedded hole; start the crane, lift the tower to the appropriate height, clean the bottom and sides of the tower, and clean it with a high-pressure water gun after cleaning; then lift the concrete tower to the top of the tower that has been hoisted, and hover it on one side. Wait until the grouting is completed before starting alignment; S10: Start the crane to lift a section of the tower to the top of the completed tower, and determine the direction of the door opening of this section of the tower according to the tower joint position, the position of the limit pin shaft or the position of the arc beam embedded part; then lower the tower section and hover it when it is 8-11 cm away from the top of the positioning pin shaft, place the rubber pad on the surface of the tower that has been hoisted, and rotate the tower to ensure that the limit pin shaft can be placed in the limit hole of this section without being damaged; then slowly lower the tower section to seat the mortar, and remove the rubber pad after the positioning pin holes are aligned; then scrape off the excess seating mortar, and use the scraped seating mortar to repair the loose parts of the seating mortar, and press the joints tightly; S11: Lift the inner operating platform. Start the crane and slowly lower the hook. Connect the wire rope to the platform's lifting point using a bow-shaped shackle. Remove the lug plate at the connection between the inner operating platform and the tower. Operate the main crane to lift the inner operating platform. Stop the crane when it reaches the desired position. Fix the lug plate to the tower's embedded parts with bolts. Remove the wire rope at the inner operating platform's lifting point. Remove the universal lifting ring at the top of the tower after the verticality measurement is qualified. S12: Lift the conversion section.

4. The wind power prefabricated steel-concrete tower assembly construction method according to claim 3, characterized in that: The first trial hoisting comprises the following steps: S1: Check whether the vertical surfaces on both sides of the tower foundation groove are vertical and whether the top surface of the tower foundation groove concrete is not higher than the surface of the limit embedded steel plate; S2: Clean the garbage on the top surface of the tower foundation groove and sprinkle water to moisten it; S3: Use a laser leveling instrument to re-measure the top surface of the leveling embedded part, and use the leveling gasket (1) to adjust the flatness according to the measurement results. The thickness of the leveling gasket (1) should be 10mm higher than the relative highest point measured, and the remaining points should be level with it; S4: Place the positioning pin; S5: Start trial lifting and determine the direction of the door opening based on the position of the positioning pin, the position of the joint, and the position of the cable embedded parts; S6: Use a crane to place the first section of the tower in the groove of the tower foundation, and ensure that the edge of the tower does not collide with the groove of the tower foundation. The positioning pin shaft is normally inserted into the limit hole of the first section of the tower, and the trial lifting is completed.

5. The wind power prefabricated steel-concrete tower assembly construction method according to claim 3, characterized in that: The hoisting comprises the following steps: S1: Lift the first section of the tower after the trial hoisting and suspend it on one side of the tower foundation, 10-20 cm above the ground; S2: Start mixing the slurry; S3: After the seat slurry is mixed, the seat slurry is spread, and the paving thickness is kept uniform to prevent the seat slurry from dripping onto the leveling pad (1); S4: After the slurry is spread, the first section of the tower is hoisted.

6. The wind power prefabricated steel-concrete tower assembly construction method according to claim 3, characterized in that: The conversion section hoisting comprises the following steps: S1: Install the lifting device into the lifting hole of the flange on the transition section and connect it to the crane hook through the lifting strap and bow shackle; S2: Start the crane to lift the transition section to the top of the completed top tower section, and apply sealant to the inner and outer sides of the top surface of the top tower section and around the prestressed holes in the circumferential direction. When the transition section is lifted to the top of the mixed tower, apply sealant to the inner and outer sides of the lower flange of the transition section and around the prestressed holes in the circumferential direction. S3: Slowly lower the hook to 8-11 cm from the top of the locating pin, determine the direction of the door opening according to the position of the locating pin hole, rotate the conversion section until the locating pin and the hole are aligned up and down, then lower the large hook to complete the installation of the conversion section, and then stick a chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveler to measure the flatness of the top surface of the conversion section.

7. The wind power prefabricated steel-concrete tower assembly construction method according to claim 1, characterized in that: The prestressed concrete tower construction comprises the following steps: S1: Hoist the inclined anchors and fall chains to the transition section, and number the prestressed ducts in the tower foundation in a counterclockwise order starting from the tower door; Set up the cable tray; Winch installation; S2: Install the pulley assembly: Fix pulley No. 1 to the door frame below the tower door; fix pulley No. 2 to the right side of the tower door entrance; fix pulley No. 3 to the position of prestressed channel No. 1 on the foundation cover plate. Pulley No. 3 moves with the position of the steel strand bundle threading hole; these three pulleys are used to guide the lifting direction of the steel strand; fix pulley No. 4 to the curved beam of the second-floor platform; fix pulley No. 5 to the elevator of the second-floor platform; these two pulleys are used to pass the wire rope; S3: Install the nylon rope and wire rope: Pass the nylon rope through the lower hook of the fall chain, drop one end of the nylon rope from the ladder to the tower foundation cover, then tie the other end of the nylon rope to the eye, and tie the end of the wire rope to the eye. Pass the wire rope through the No. 4 and No. 5 pulleys in sequence, connect it to the nylon rope eye at the elevator, and lift the wire rope. After the wire rope reaches the predetermined height, untie the connecting eye and secure the nylon rope to the fall chain. Pass the wire rope and its eye through another fall chain and through the corresponding prestressed hole. Start the winch and slowly lower it to the second-floor platform along the gap between the outer side of the platform and the inner wall of the tower. S4: First channel threading: When the steel wire rope drops to the second-floor platform, pass the steel wire rope through the No. 3, No. 2, and No. 1 pulleys and rubber sleeves in sequence, and connect and secure the lifting ring to the steel strand pier head on the outer cable drum; start the winch to lift the steel strand to the top of the steel tower conversion channel; after the inclined anchor is fixed, pass another sling from left to right through the anchor and fix it to the lower hook of the fall chain to release the open anchor, rotate the fall chain to drop the steel strand to the channel; finally, pull out the sling; S5: After the stranding is completed at this hole, move the fall chain and pulley No. 3, repeat steps 3 and S4, and sequentially lift the steel strands of the remaining holes No. 2 to No. 18 at this location. After the stranding is completed at hole No. 18, hoist the cable tray to the right, move the fall chain, pulleys No. 2, No. 3, and No. 5 to their opposite sides, and repeat steps 2 to S4 to complete the stranding of the remaining steel strands. S6: After the upper steel strands are bundled, insert the corresponding steel strands into the bell mouth of the tower base cover according to the hole position. After all the steel strands are inserted into the tower base, check the contamination and length of the steel strands in turn. If the distance from the ground is less than 400mm, the steel strands need to be peeled and the excess part needs to be cut off. S7: After all steel strands are bundled, the concrete strength of the tower section reaches 100% of the design strength and the base slurry strength reaches 60MPa before tensioning can be carried out; Before installing the flat anchor, check whether the concrete at the bell mouth is dense. When the concrete meets the tensioning requirements, spread out the steel strands in each prestressed channel and align the nine steel strands with the nine holes on the flat anchor. Lift the flat anchor from the bottom of the steel strands to the bell mouth and fit it tightly with the concrete at the bell mouth. Then insert the clips into the nine holes of the flat anchor to secure each steel strand. S8: perform jack tensioning; S9: Anti-corrosion treatment: After the tensioning is completed and accepted, reserve 700mm of prestressed steel strand exposed from the lower node anchorage and reserve no less than 350mm of prestressed steel strand exposed from the upper node anchorage, cut off the excess part, and clean the tensioning end; Fill the center holes of the upper and lower anchors with foam glue; smear and cover the anchors and exposed steel strands with anti-corrosion grease; finally, cover and secure the anchors and exposed steel strands with corresponding anchor covers; After the anchoring is completed, inject cement slurry into the lower anchoring cover; inject cement slurry into the anchoring cover along the bell mouth of the foundation cover to a height of 400~600mm.

8. The wind power prefabricated steel-concrete tower assembly construction method according to claim 7, characterized in that: In step S8, the jack tensioning step includes: inserting the limit plate from the lower part of the steel strand and fitting it tightly with the flat anchor, inserting the four jack sleeves from the end of the steel strand in sequence according to the numbers 1-10-19-28, lifting the jack to the limit plate and fitting it tightly, tensioning is performed using four-point symmetry, and tensioning is performed in the four holes in the order of 1-10-19-28. After the tensioning of the steel strand in the hole is completed, the four Rotate the tensioning point 45 degrees counterclockwise and start tensioning the steel strands in holes numbered 5-14-23-32. Similarly, tension the steel strands in the remaining holes in the order of 2-11-20-29, 6-15-24-33, 3-12-21-30, 7-16-25-34, 4-13-22-31, 8-17-26-35, and 9-18-27-36.

9. The wind power prefabricated steel-concrete tower assembly construction method according to claim 7, characterized in that: In the tensioning process of step S8, the tensioning force of each steel strand is 188.2 kN, and the tensioning is controlled according to the data converted by the jack and the pressure gauge; after the oil pump is started, the pressure is stopped at 30%, 55%, 80%, and 105% of the standard pressure value; After each tensioning, measure the elongation value and record it, then put the jack back and continue to apply pressure. If the steel strand is less than 50mm from the ground during the tensioning process, part of the steel strand needs to be cut off to ensure smooth tensioning. Repeat the jack tensioning steps until the design tensioning force is reached and hold the load for 2 minutes.

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