Assembly construction method of wind power assembly type reinforced concrete tower drum

Abstract

The invention discloses a wind power assembly type reinforced concrete tower tube assembly construction method, an assembly type reinforced concrete tower tube comprises a concrete tower splicing ring piece, a concrete tower full-circle ring piece and a steel tower conversion section, and the tower tube comprises the spliced ring piece, the full-circle ring piece and the steel tower conversion section from bottom to top; the construction method comprises the process of assembling the fabricated reinforced concrete tower drum through concrete tower piece splicing construction, concrete tower drum and steel tower conversion section hoisting construction and concrete tower drum prestress construction. According to the construction method, assembly and assembly of the concrete tower drum are completed through crawler crane line production, the fan foundation, the concrete tower drum and the steel conversion section are connected through concrete tower drum outer cable unbonded prestress construction, and the construction period is remarkably shortened. In addition, by optimizing the construction process, rapid installation of the prefabricated shell ring is achieved, the construction progress is accelerated, and meanwhile the construction cost is reduced.

Description

Technical Field

[0001] The 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 the global demand for renewable energy continues to increase, the wind power industry is also developing rapidly. Wind power concrete towers are an important part of wind farm construction and play a key role in ensuring the efficiency and safety of wind power generation. How to improve construction efficiency and reduce construction costs has long been a problem that needs to be solved.

[0003] The patent document with the announcement number CN115306645A discloses a method for installing and constructing a wind power generation concrete tower, which adopts a factory prefabrication and centralized assembly method, including prefabricating semicircular C-shaped concrete tower segments, centralized assembly and combination of mixed tower segments, installation of accessories in mixed tower segments, on-site transportation of mixed tower segments, hoisting and placing the first segment of the mixed tower, hoisting and placing other O-shaped segments of the mixed tower, hoisting and placing the steel transition segment, prestressing construction of the mixed tower, and overall inspection and acceptance. The present invention uses modules to prefabricate into a structural form that is easy to stack, transport, and install, vertically segmented and horizontally segmented, first prefabricated into semicircular C-shaped concrete segments, and assembled into O-shaped mixed tower segments on site, and adopts a segment-by-segment hoisting, staggered installation, and circumferential joint installation method. After the entire concrete tower is installed, it is in the shape of a tall truncated cone, and is prestressed with the steel transition stage and the permanent foundation platform of the wind turbine to form an integral structure, becoming a stable support tower for the wind turbine, thereby 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 at a later time; during the construction of this method, epoxy resin is used at the top of the tower pipe section, and in the present 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 the present application uses a large number of grouting parts, which can increase the service life.

[0005] The patent document with the announcement number CN118346530A discloses a single steel plate-concrete composite structure tower and construction method, wherein the tower includes a barrel, which is composed of a plurality of combined barrel sections in the axial direction, and the diameter of each combined barrel section decreases from low to high, and adjacent combined barrel sections are assembled by mortise and tenon flange nodes; each combined barrel section is assembled by a plurality of single steel plate-concrete composite shells in the circumferential direction, and adjacent single steel plate-concrete composite shells are connected and fastened by bent bolts. The mortise and tenon flange node includes an upper flange plate with a plurality of tenons, a lower flange plate with a plurality of mortise 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 rotating stages used in the present 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 assembled steel-concrete tower assembly construction method.

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

[0009] The present invention provides a wind power assembled steel-concrete tower assembly construction method, wherein the assembled steel-concrete tower comprises a spliced ​​ring segment, a full-circle ring segment and a transition segment, wherein the spliced ​​ring segment is connected to the transition segment via the full-circle ring segment, and the construction method comprises a process of assembling the assembled steel-concrete tower through concrete tower segment assembly construction, concrete tower and transition segment hoisting construction, and concrete tower prestressing construction.

[0010] Preferably, the spliced ​​ring segment includes segment A and segment 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 arranged 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-shaped shackle. Lift the hook of the crane and lift segment A onto the leveling pad that has been placed;

[0013] S3: Repeat step S2, lift segment B and place it on the already placed leveling pad 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 segments A and B, place three sets of assembly tooling next to the leveling pad under segment B, place a hydraulic jack A in each assembly tooling, and support the spliced ​​ring segment with the hydraulic jack A to keep the spliced ​​ring segment and the leveling pad spaced, and adjust the height of the leveling pad by the height difference between segment A and segment B;

[0014] S4: Use hydraulic jack B to adjust the position of hydraulic jack A by assembling 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 on the contact surfaces of slices A and A with a thickness of 2 mm; after the 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 fit together, and use bolts to screw into the screw holes on slices B and A respectively for fastening;

[0016] 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 segments A and B meets the requirement of ≤3mm;

[0017] After the assembly of segments A and B, 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 during the curing process 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. The other end of the universal lifting ring is connected to the lifting belt B through the bow-shaped shackle. The lifting belt B is hung in the crane hook. The crane hook lifts the entire ring and hangs 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 the potholes. Clean the bottom surface and inner and outer sides of the tower to ensure that there is no dirt or 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 lifting.

[0024] S4: After the first section of the tower is hoisted in 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 slope surface with a high inside and a low outside, with a height difference of 5 to 8 mm; after the first section of the mixed tower is hoisted, the grounding installation of the first section of the tower and the tower foundation equalizing ring must be completed in time. Before installation, the grounding embedded parts must be polished and coated with conductive paste. After installation, the grounding screws must be treated with anti-corrosion and anti-loosening lines must be drawn;

[0025] S5: Hoist the middle section of the concrete tower between the first section of the tower and the steel tower conversion section: connect the wire rope to the lifting point of the operating platform through the bow-shaped shackle, and install the safety hanging point and the anti-fall rope before the tower is lifted; start the crane, and hoist the operating platform into the first section of the tower, and fix the six ear plates of the operating platform to the embedded parts of the tower with bolts; after the installation is completed, turn the winch on the platform so that the hook is above the ground mixer, and connect the hook to the ash hopper and place it at the ground mixer;

[0026] 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. According to the measured data, add a 10mm thick leveling shim relative to the highest point of the measuring point, and the remaining points need to be leveled with the position using leveling shims according to the difference.

[0027] S7: Mix the seat slurry, put the seat slurry into a mixer, and pour the weighed water into the mixer until it is evenly mixed and no granular residue remains in the mixer. The mixing time is 6 to 8 minutes. After the mixing is completed, pour the seat slurry into a hopper connected to a 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, the laid seat slurry is spread and sorted 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-shaped shackle, and hang the lifting belt B into the crane hook. At the same time, screw the positioning pin shaft on the top of the tower section into the corresponding embedded hole; start the crane, lift the tower to a suitable 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 suspend it on one side, waiting for the slurry to be laid before starting to align

[0030] S10: Start the crane to lift a section of the tower to the top of the tower that has been hoisted, 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 this section of the tower, hover when it is 8-11cm 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 drop this section of the tower to seat the mortar, and after the positioning pin holes are aligned, take out the rubber pad; 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 to make them compact and dense;

[0031] S11: Lift the inner operating platform, start the crane and slowly lower the big hook, connect the wire rope to the platform lifting point with a bow-shaped shackle; remove the ear 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 operation when it is lifted to the corresponding position, and fix the ear plate of the operating platform to the embedded parts of the tower with bolts, remove the wire rope at the lifting point of the inner operating platform; remove the universal lifting ring on the top of the tower after the verticality measurement is qualified;

[0032] S12: Just hoist 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 wet it with water;

[0036] S3: Use a laser leveling instrument to re-measure the top surface of the leveling embedded part, and use a leveling shim to adjust the flatness according to the measurement results. The thickness of the leveling shim should be 10mm higher than the measured relative highest point, 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 according to the position of the positioning pin, the position of the joint and the position of the cable embedded parts;

[0039] S6: Through crane operation, place the first section of the tower in the groove of the tower foundation, and there is no collision between the edge of the tower and 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 to 20 cm above the ground;

[0042] S2: Start mixing the slurry;

[0043] S3: After the seat slurry is mixed, the seat slurry is spread, and the spreading thickness is kept uniform to prevent the seat slurry from dripping onto the leveling pad;

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

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

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

[0047] S2: Start the crane to lift the conversion section to the top of the top section tower that has been hoisted, and apply sealant on the inner and outer sides of the top surface of the top section tower and around the prestressed holes in the circumferential direction. When the conversion section is lifted to the top of the mixed tower, apply sealant on the inner and outer sides of the lower flange surface of the conversion section and around the prestressed holes in the circumferential direction;

[0048] S3: Slowly lower the hook to 8-11cm 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, then stick a chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveling meter to measure the flatness of the top surface of the conversion section.

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

[0050] S1: Lift the inclined anchor and fall chain to the conversion section, and number the prestressed channels in the tower foundation in a counterclockwise order from the tower door;

[0051] Set up the cable tray;

[0052] Winch installation;

[0053] S2: Install the pulley block: 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, and pulley No. 3 changes with the position of the strand bundle hole; these three pulleys are used to guide the lifting direction of the strand; fix pulley No. 4 to the arc 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 steel wire ropes;

[0054] S3: Install nylon rope and wire rope: Pass the nylon rope through the lower hook of the fall chain, and let one end of the nylon rope fall from the ladder to the tower foundation cover. Then tie the other end of the nylon rope to the ring, and tie the end of the wire rope to the ring. The wire rope passes through the No. 4 and No. 5 pulleys in turn, and is connected to the nylon rope ring at the elevator to lift the wire rope. After the wire rope reaches the predetermined height, untie the connecting ring, and tie the nylon rope to the fall chain to fix it. Pass the wire rope and its ring through another fall chain and the corresponding prestressed hole, and start the winch to 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.

[0055] S4: First channel threading: When the steel wire rope falls to the second floor platform, pass the steel wire rope through the No. 3, No. 2, No. 1 pulleys and rubber sleeves in sequence, and connect and fix the lifting ring to the steel strand pier head on the outer cable tray; start the winch to lift the steel strand to the top of the steel tower conversion section channel; after the inclined anchor is fixed, use another sling to pass through the anchor from left to right, and fix it on 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 bundle is threaded at this hole, move the fall chain and the position of the No. 3 pulley, repeat steps 3 and S4, and lift the steel strands of the remaining No. 2-18 holes in this position in turn; after the bundle is threaded at the No. 18 hole, hoist the cable tray to the right, move the fall chain, No. 2, No. 3, and No. 5 pulleys to their symmetrical sides, repeat steps 2 to S4, and the remaining steel strands are threaded;

[0057] S6: After the upper strands are bundled, the corresponding strands are inserted into the bell mouth in sequence according to the hole positions at the tower foundation cover plate; after all the strands are inserted into the tower foundation, check the contamination and length of the strands in sequence; if the distance from the ground is less than 400mm, the strands need to be peeled and the excess parts need to be cut off;

[0058] S7: After all the steel strands are tied, 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 hole, and align the 9 steel strands with the 9 holes on the flat anchor; lift the flat anchor from the lower part of the steel strand to the bell mouth, and fit it tightly with the concrete at the bell mouth; then insert the clip into the 9 holes of the flat anchor to fix each steel strand;

[0060] S8: Perform jack tensioning;

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

[0062] Fill the center holes of the upper and lower anchors with foam glue; 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 to 600 mm.

[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 four jack sleeves from the ends 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 numbered order 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 the tensioning process of step S8, the tensioning force of each steel strand is 188.2 kN, and the tensioning control is performed 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 it back on the jack and continue to pressurize. 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 required 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 crane flow operation to complete the assembly and assembly of the concrete tower, and adopts non-bonded prestressed construction of the concrete tower outer cable to connect the wind turbine foundation, concrete tower and steel conversion section, which significantly shortens the construction period. In addition, by optimizing the construction process, the rapid installation of prefabricated cylinder sections is achieved, which speeds up the construction progress and reduces the construction cost. The assembled steel-concrete tower of the present invention has good mechanical properties. At the same time, the steel strand has no fixed contact with the inner wall of the cylinder, which facilitates the replacement of the steel strand and reduces the requirements for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a construction flow chart of the concrete tower segment assembly 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 of the present invention;

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

[0074] Figure 5 It is the prestressed duct numbering diagram 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 assembled steel-concrete tower assembly construction method, the assembled steel-concrete tower includes concrete tower spliced ​​ring segments, concrete tower full-circle ring segments and steel tower conversion segments, the tower is composed of spliced ​​ring segments, full-circle ring segments and steel tower conversion segments from bottom to top, and the construction method includes the process of assembling the assembled steel-concrete tower through concrete tower segment assembly construction, concrete tower and conversion segment hoisting construction and concrete tower prestressing construction.

[0080] The 1st to 31st sections of the prefabricated steel-concrete tower of the wind power plant are concrete towers, and the 32nd section is the steel tower conversion section. The 1st to 16th sections are spliced ​​rings, and the 17th to 31st sections are full-circle rings. The height of the 1st to 31st sections is 112m, and the height of the steel tower conversion section is 113.48m. A 220T crawler crane is used to assemble the concrete tower segments, and a 650T crawler crane is used to assemble the 1st to 31st sections of the tower and the steel tower conversion section.

[0081] The spliced ​​ring segments include segments A2 and segments B3, and segments A2 and segments B3 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 hook, use a bow-shaped shackle to connect the sling A to the hook at the other end, and hang the hook into the lifting ear 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. The leveling pads 1 are arranged at both ends and the middle of the bottom of the splicing ring.

[0083] S2: Manually climb to the top of tower segment A2 with a ladder, screw the universal lifting ring into the embedded part of segment A2 lifting point, and screw it into the depth of not less than 85mm; 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. After that, the personnel evacuate, the crane slowly lifts the hook and lifts segment A2 onto the already placed leveling pad 1. After the placement is completed, manually remove the lifting point;

[0084] S3: Repeat step S2, lift segment B3 and place it on the already placed leveling pad 1 and remove the lifting point; set a laser line marker at the center of the tower, 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 tooling next to the leveling pad 1 below segment B3, place a 50t hydraulic jack A in each assembly tooling, and support the spliced ​​ring segment with the 50t hydraulic jack A to keep a gap between the spliced ​​ring segment and the leveling pad 1, and adjust the height of the leveling pad 1 by the height difference between segment A2 and segment B3;

[0085] S4: Use 10t hydraulic jack B to adjust the position of 50t hydraulic jack A by assembling tooling to adjust segment B3 so that the end surface of segment B3 on the side close to segment A1 is parallel to the contact surface of segment A1 and the interval is 15-25cm;

[0086] S5: Use a plastering knife and a plastering board to apply epoxy adhesive on the contact surface of slices A1 and A2. The epoxy adhesive is Bolicon PJ10 adhesive. When applying, care should be taken to keep the contact surface clean and dry, avoid applying at the bolt holes, and apply with a thickness of 2mm. After the application is completed, 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 fitted together, and use M30 straight bolts to screw into the screw holes on slices B3 and A2 for fastening;

[0087] S6: Use a torque wrench to 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 segments A2 and B3 meets the requirement of ≤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 polished manually with a handheld grinder. For misalignment after assembly and sagging during the curing process of the epoxy resin adhesive on the bottom, 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 conversion 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 belts B through bow-shaped shackles, and the lifting belts B are hung in the crane hook. The crane hook lifts the entire ring and hangs it at a suitable height.

[0091] S2: Use a high-pressure water gun to clean the groove of the tower foundation, ensuring that the surface is moist during hoisting, but there is no water accumulation in the potholes. Use a high-pressure water gun to clean the bottom surface and inner and outer sides of the tower to ensure that there is no dirt or other pollutants on the bottom surface and inner and outer sides; and after the flushing is completed, avoid large water droplets adhering to the bottom surface;

[0092] S3: Carry out the first trial lift before lifting.

[0093] S4: After the first section of the tower is hoisted in 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 needs to be manually smoothed with a plastering knife to form a slope surface with a high inside and a low outside, with a height difference of 5 to 8 mm; after the first section of the tower is hoisted, the grounding installation of the first section of the tower and the tower foundation equalizing ring should be completed in time. Before installation, the grounding embedded parts need to be polished and coated with conductive paste. After installation, the grounding screws should be treated with anti-corrosion and anti-loosening lines should be drawn;

[0094] S5: Hoist the middle section of the concrete tower between the first section of the tower and the steel tower conversion section: manually connect the four steel wire ropes to the four lifting points of the operating platform through the bow-shaped shackles, and 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 section of the tower. Manually climb onto the operating platform with a ladder, and use an electric wrench to fix the six ear plates of the operating platform to the tower embedded parts with M20 high-strength bolts; after the installation is completed, 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 the flatness and leveling. Use a broom, a watering can (mist) and other tools to clean the top surface of the first section of the tower to ensure that there is no scum, loose soil and other garbage on the top surface; manually place the leveling instrument, and measure the top surface flatness of the four leveling embedded parts and two limit embedded parts plates on the top surface of the tower, and calculate the difference; according to the measured data, among the six measuring points, add a 10mm thick leveling gasket 1 relative to the highest point, and the remaining points need to be leveled with the position using leveling gasket 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 weight of the required water by an electronic scale; put the seat slurry into a 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 a hopper connected to the winch and lift it to the top surface of the tower; make the remaining seat slurry in the mixer into a test block with a size of 40*40*160, 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 sort 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: Lift 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 positioning pins on the top of this section of the tower are screwed into the corresponding embedded holes; start the crane, lift the tower to a suitable height, manually use a shovel or spade to clean the garbage on the bottom and sides of the tower, and clean it with a high-pressure water gun after cleaning; then slowly lift the concrete tower to the top of the tower that has been hoisted, and hover on one side, waiting for the slurry to be laid before starting to align.

[0099] S10: Start the crane to lift a section of the tower to the top of the tower that has been hoisted, and determine the direction of the door opening of this section of the tower according to the position of the tower joint, the position of the limit pin shaft or the position of the arc beam embedded part; then drop the section of the tower, and hover it when it is 8-11cm away from the top of the positioning pin shaft, and place 4 rubber pads on the surface of the tower that has been hoisted. 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 limit pin shafts at both locations can be placed in the limit holes of this section without being damaged; then slowly Slowly lower the section of the tower tube to install the mortar. After the alignment of the positioning pin holes is completed, take out the rubber pad. Then one person uses a plastering knife to scrape off the excess mortar. The loose parts of the mortar are repaired with the scraped mortar. The grouting should be pressed compactly. For external grouting, the plastering knife can be fixed with the extension rod, and the excess mortar on the outside can be scraped off from the top (this step needs to be done after the inner operating platform is lifted). If there is an incomplete gap, it is necessary to use tools such as a hanging basket or a seat plate to manually repair it on the outside. The external grouting should also be pressed compactly.

[0100] S11: Lift the inner operating platform, start the crane and slowly lower the big hook, connect the four steel wire ropes to the platform lifting points with 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 operation when it is lifted to the corresponding position, and manually fix the six lugs of the operating platform to the embedded parts of the tower with high-strength bolts, remove the steel wire ropes at the lifting points of the inner operating platform; remove the universal lifting ring on the top of the tower after the verticality measurement is qualified;

[0101] S12: Just hoist 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: Manually clean the garbage on the top surface of the tower foundation groove with tools such as brooms and shovels, 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 use leveling gasket 1 to adjust the flatness according to the measurement results. The thickness of leveling gasket 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 according to 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 there is no collision between the edge of the tower and the groove of the tower foundation, and the positioning pin shaft is normally inserted 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 to 20 cm above the ground;

[0111] S2: Start mixing the slurry: Strictly mix according to the water-cement ratio provided by the manufacturer, the mixing time is 6 to 10 minutes, the specific time is subject to the actual situation on site;

[0112] S3: After the seat slurry is mixed, the auxiliary hoist 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 part position is absolutely level;

[0113] S4: After the slurry is spread, the first section of the tower is hoisted. The hoisting action refers to 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 conversion section in the lifting hole of the upper flange of the conversion section, and connect it to the crane hook through the lifting belt and bow shackle;

[0116] S2: Start the crane to lift the conversion section to the top of the top section tower that has been hoisted, and apply sealant on the inner and outer sides of the top surface of the top section tower and around the prestressed holes with a glue gun. When the conversion section is lifted to the top of the mixed tower, apply sealant on the inner and outer sides of the lower flange surface of the conversion section and around the prestressed holes in the circumferential direction;

[0117] S3: Slowly lower the hook to 8-11cm from the top of the positioning pin shaft. Two people determine the direction of the door opening according to the position of the positioning pin hole. Two people cooperate to rotate the conversion section until the positioning pin shaft and the hole are aligned up and down. Then drop the large hook to complete the installation of the conversion section. Then paste the chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveling meter 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 anchor and fall chain to the conversion section, and number the 36 prestressed holes 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 (opposite to 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 steel wire rope;

[0121] Installation of winch: hoist the winch to the platform at the external ladder tower door, tie it securely with steel pipes and ropes, power on the winch and complete the commissioning;

[0122] S2: Install the pulley block: fix pulley No. 1 to the door frame below the tower door; fix pulley No. 2 to the right of the tower door entrance, that is, on the second-floor platform just above hole No. 1; fix pulley No. 3 to the position of prestressed hole No. 1 on the foundation cover plate, and pulley No. 3 changes with the position of the strand bundle threading hole; these three pulleys are used to guide the lifting direction of the strand; fix pulley No. 4 to the arc 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 steel wire ropes;

[0123] S3: Install nylon rope and wire rope: Pass the nylon rope through the lower hook of a fall chain, and one end of the nylon rope falls from the ladder to the tower foundation cover plate, controlled by two workers below; then tie the other end of the nylon rope to the ring, and drop it from the elevator to the second-floor platform, and tie the end of the wire rope to the ring. This wire rope passes through the No. 4 and No. 5 pulleys in turn, and is connected to the nylon rope ring at the elevator. Two workers on the bottom floor manually drag 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 ring and tie the nylon rope to the fall chain; pass the wire rope and its ring through another fall chain through 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 steel wire rope falls to the second floor platform, a worker here will pass the steel wire rope through the No. 3, No. 2, No. 1 pulleys and rubber sleeves in turn, and connect and fix the lifting ring with the steel strand pier head on the outer cable drum; start the winch to 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 tie that fixes the steel strand to ensure that there is no obstruction during the lifting of the steel strand; after the oblique anchor is fixed, another sling is used to pass through the anchor from left to right, and it is fixed to the lower hook of the fall chain to release the open anchor at 300mm, and slowly rotate the fall chain to drop the steel strand to the channel; finally, slowly pull out the sling;

[0125] S5: After the bundle is threaded at this hole, move the fall chain and the position of the No. 3 pulley, repeat steps 3 and S4, and lift the steel strands of the remaining No. 2-18 holes in this position in turn; after the bundle is threaded at the No. 18 hole, hoist the cable tray to the right, move the fall chain, No. 2, No. 3, and No. 5 pulleys to their symmetrical sides, repeat steps 2 to S4, and the remaining steel strands are threaded;

[0126] S6: After the upper strands are bundled, 4 workers insert the corresponding strands into the bell mouth in sequence according to the hole positions at the tower foundation cover plate; after all the strands are inserted into the tower foundation, 1 worker checks the contamination and length of the strands in sequence; if the strands are contaminated, they need to be cleaned; if the distance from the ground is less than 400mm, the 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 strands smoothly;

[0127] S7: After all the strands are tied, the tie-in equipment shall be lowered from the external ladder in time; the jack, the pressure gauge, oil pump and other tensioning equipment matching the jack shall be hoisted into the foundation; check whether the oil circuit of the oil pump is unobstructed and the circuit is safe; the tower section concrete strength shall reach 100% of the design strength and the seat slurry strength shall reach 60MPa before tensioning;

[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 out the steel strands in each prestressed hole, and align the 9 steel strands with the 9 holes on the flat anchor; lift the flat anchor from the lower part of the steel strand to the bell mouth, and fit it tightly with the concrete at the bell mouth; then insert the clip into the 9 holes of the flat anchor to fix each steel strand;

[0129] S8: Perform jack tensioning;

[0130] S9: Anti-corrosion treatment: After the tensioning is completed and accepted, reserve 700mm of the prestressed steel strand exposed at the lower node anchor and reserve no less than 350mm of the prestressed steel strand exposed at 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; 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, the cement slurry needs to 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 bell mouth of the foundation cover to a height of 400 to 600 mm 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 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 numbering 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 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.

[0134] In the step S8, during the tensioning process, the tensioning force of each steel strand is 188.2 kN, and the tensioning control is performed 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;

[0135] After each tensioning, measure the elongation value and record it, then put it back on the jack and continue to pressurize. 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 required tensioning force is reached and hold the load for 2 minutes.

Claims

1. A wind power prefabricated steel-concrete tower assembly construction method, characterized in that: The assembled steel-concrete tower comprises concrete tower spliced ​​ring segments, concrete tower full-circle ring segments and steel tower conversion segments. The tower comprises spliced ​​ring segments, full-circle ring segments and steel tower conversion segments from bottom to top. The construction method comprises the process of assembling the assembled steel-concrete tower through concrete tower segment assembly construction, concrete tower and conversion segment hoisting construction and concrete tower prestressing construction.

2. The wind power assembled steel-concrete tower assembly construction method according to claim 1, characterized in that: 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. The leveling pads (1) are arranged at both ends and the middle 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 crane hook and lift segment A (2) onto the leveling pad (1) that has been placed. S3: Repeat step S2, lift segment B (3) and place it on the already placed leveling pad (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 segments A (2) and segment B (3) by the position of the laser line on the two segments, place three sets of assembly tools next to the leveling pad (1) below segment B (3), place a hydraulic jack A in each assembly tool, and support the spliced ​​ring segment with the hydraulic jack A to maintain a gap between the spliced ​​ring segment and the leveling pad (1), and adjust the height of the leveling pad (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 surface of segment B (3) on the side close to segment A (1) is parallel to the contact surface of segment A (1); S5: Apply epoxy adhesive to the contact surfaces of slices A(1) and A(2) 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 tooling so that the end faces of slices B(3) and A(2) fit together, and use bolts to screw into the screw holes on slices B(3) and A(2) to tighten them. 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, and check whether the flatness of the upper and lower surfaces of segment A (2) and segment B (3) meets the requirement of ≤3 mm; 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, they need to be smoothed. The chamfers at the joints of the inner walls of segments A (2) and B (3) are smoothed with epoxy resin adhesive.

3. The wind power assembled steel-concrete tower assembly construction method according to claim 2, 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 (1) is parallel to the contact surface of the slice A (1) and is spaced 15-25 cm apart.

4. The wind power assembled steel-concrete tower assembly construction method according to claim 1, characterized in that: The concrete tower and conversion section hoisting construction includes the following steps: S1: Screw the universal lifting ring into the embedded part of the tower lifting point. The other end of the universal lifting ring is connected to the lifting belt B through the bow-shaped shackle. The lifting belt B is hung in the crane hook. The crane hook lifts the entire ring and hangs 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 the potholes. Clean the bottom surface and inner and outer sides of the tower to ensure that there is no dirt or 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 lifting. S4: After the first section of the tower is hoisted in 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 slope surface with a high inside and a low outside, with a height difference of 5 to 8 mm; after the first section of the mixed tower is hoisted, the grounding installation of the first section of the tower and the tower foundation equalizing ring must be completed in time. Before installation, the grounding embedded parts must be polished and coated with conductive paste. After installation, the grounding screws must be treated with anti-corrosion and anti-loosening lines must be drawn; S5: Hoist the middle section of the concrete tower between the first section of the tower and the steel tower conversion section: connect the wire rope to the lifting point of the operating platform through the bow-shaped shackle, and install the safety hanging point and the anti-fall rope before the tower is lifted; start the crane, and hoist the operating platform into the first section of the tower, and fix the six ear plates of the operating platform to the embedded parts of the tower with bolts; after the installation is completed, turn the winch on the platform so that the hook is above the ground mixer, and connect the hook to the ash hopper and place it at the ground mixer; S6: Measure the flatness and leveling. Clean the top surface of the first section of the tower, place a 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. According to the measured data, at the measuring point, a 10mm thick leveling shim (1) is added relative to the highest point position, and the remaining points need to be leveled with the position using the leveling shim (1) according to the difference. S7: Mix the seat slurry, put the seat slurry into a mixer, and pour the weighed water into the mixer until it is evenly mixed and no granular residue remains in the mixer. The mixing time is 6 to 8 minutes. After the mixing is completed, pour the seat slurry into a hopper connected to a 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, the laid seat slurry is spread and sorted 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-shaped shackle, and hang the lifting belt B into the crane hook. At the same time, screw the positioning pin shaft on the top of the tower section into the corresponding embedded hole; start the crane, lift the tower to a suitable 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 suspend it on one side, waiting for the slurry to be laid before starting to align S10: Start the crane to lift a section of the tower to the top of the tower that has been hoisted, 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 this section of the tower, hover when it is 8-11cm 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 drop this section of the tower to seat the mortar, and after the positioning pin holes are aligned, take out the rubber pad; 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 to make them compact and dense; S11: Lift the inner operating platform, start the crane and slowly lower the big hook, connect the wire rope to the platform lifting point with a bow-shaped shackle; remove the ear 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 operation when it is lifted to the corresponding position, and fix the ear plate of the operating platform to the embedded parts of the tower with bolts, remove the wire rope at the lifting point of the inner operating platform; remove the universal lifting ring on the top of the tower after the verticality measurement is qualified; S12: Just hoist the conversion section.

5. The wind power assembled steel-concrete tower assembly construction method according to claim 4, 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 wet it with water; S3: Use a laser leveling instrument to re-measure the top surface of the leveling embedded part, and use the leveling shim (1) to adjust the flatness according to the measurement results. The thickness of the leveling shim (1) should be 10 mm 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 according to the position of the positioning pin shaft, the position of the joint and the position of the cable embedded parts; S6: Through crane operation, place the first section of the tower in the groove of the tower foundation, and there is no collision between the edge of the tower and 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.

6. The wind power assembled steel-concrete tower assembly construction method according to claim 4, 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 to 20 cm above the ground; S2: Start mixing the slurry; S3: After the seat slurry is mixed, the seat slurry is spread, and the spreading 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.

7. The wind power assembled steel-concrete tower assembly construction method according to claim 4, characterized in that: The conversion section hoisting comprises the following steps: S1: Install the lifting device in the lifting hole of the flange on the conversion section and connect it to the crane hook through the lifting belt and bow shackle; S2: Start the crane to lift the conversion section to the top of the top section tower that has been hoisted, and apply sealant on the inner and outer sides of the top surface of the top section tower and around the prestressed holes in the circumferential direction. When the conversion section is lifted to the top of the mixed tower, apply sealant on the inner and outer sides of the lower flange surface of the conversion section and around the prestressed holes in the circumferential direction; S3: Slowly lower the hook to 8-11cm 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, then stick a chloroprene waterproof strip on the outside of the horizontal joint between the conversion section and the tower, and use a leveling meter to measure the flatness of the top surface of the conversion section.

8. The wind power assembled steel-concrete tower assembly construction method according to claim 1, characterized in that: The concrete tower prestressing construction comprises the following steps: S1: Lift the inclined anchor and fall chain to the conversion section, and number the prestressed channels in the tower foundation in a counterclockwise order from the tower door; Set up the cable tray; Winch installation; S2: Install the pulley block: 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, and pulley No. 3 changes with the position of the strand bundle hole; these three pulleys are used to guide the lifting direction of the strand; fix pulley No. 4 to the arc 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 steel wire ropes; S3: Install nylon rope and wire rope: Pass the nylon rope through the lower hook of the fall chain, and let one end of the nylon rope fall from the ladder to the tower foundation cover. Then tie the other end of the nylon rope to the ring, and tie the end of the wire rope to the ring. The wire rope passes through the No. 4 and No. 5 pulleys in turn, and is connected to the nylon rope ring at the elevator to lift the wire rope. After the wire rope reaches the predetermined height, untie the connecting ring, and tie the nylon rope to the fall chain to fix it. Pass the wire rope and its ring through another fall chain and the corresponding prestressed hole, and start the winch to 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. S4: First channel threading: When the steel wire rope falls to the second floor platform, pass the steel wire rope through the No. 3, No. 2, No. 1 pulleys and rubber sleeves in sequence, and connect and fix the lifting ring to the steel strand pier head on the outer cable tray; start the winch to lift the steel strand to the top of the steel tower conversion section channel; after the inclined anchor is fixed, use another sling to pass through the anchor from left to right, and fix it on 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 bundle is threaded at this hole, move the fall chain and the position of the No. 3 pulley, repeat steps 3 and S4, and lift the steel strands of the remaining No. 2-18 holes in this position in turn; after the bundle is threaded at the No. 18 hole, hoist the cable tray to the right, move the fall chain, No. 2, No. 3, and No. 5 pulleys to their symmetrical sides, repeat steps 2 to S4, and the remaining steel strands are threaded; S6: After the upper strands are bundled, the corresponding strands are inserted into the bell mouth in sequence according to the hole positions at the tower foundation cover plate; after all the strands are inserted into the tower foundation, check the contamination and length of the strands in sequence; if the distance from the ground is less than 400mm, the strands need to be peeled and the excess parts need to be cut off; S7: After all the steel strands are tied, 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 hole, and align the 9 steel strands with the 9 holes on the flat anchor; lift the flat anchor from the lower part of the steel strand to the bell mouth, and fit it tightly with the concrete at the bell mouth; then insert the clip into the 9 holes of the flat anchor to fix each steel strand; S8: Perform jack tensioning; S9: Anti-corrosion treatment: After the tensioning is completed and accepted, reserve 700mm of the prestressed steel strand exposed at the lower node anchor and reserve no less than 350mm of the prestressed steel strand exposed at the upper node anchor, cut off the excess part, and clean the tensioning end; Fill the center holes of the upper and lower anchors with foam glue; 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 to 600 mm.

9. The wind power assembled steel-concrete tower assembly construction method according to claim 8, 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 four jack sleeves from the ends 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 according to the numbered order 1-10-19-28. After the tensioning of the steel strand in the hole is completed, the four Rotate the tensioning point counterclockwise 45 degrees 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.

10. The wind power assembled steel-concrete tower assembly construction method according to claim 8, characterized in that: In the step S8, during the tensioning process, the tensioning force of each steel strand is 188.2 kN, and the tensioning control is performed 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; After each tensioning, measure the elongation value and record it, then put it back on the jack and continue to pressurize. 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 required tensioning force is reached and hold the load for 2 minutes.

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