A boiler heating surface construction platform and a construction method for a thermal power plant based on BIM technology

Abstract

This invention discloses a construction platform and method for boiler heating surfaces in thermal power plants based on BIM technology. The construction platform includes a platform and first legs. The first legs are located at the bottom of the platform, and horizontal supports are spaced apart inside the platform. Connecting rods are spaced apart between adjacent horizontal supports, forming a grid-like construction platform. A U-shaped frame is located on the left side of the platform. Rollers are connected to the bottom of both sides of the U-shaped frame via second legs. Support plates are installed between the inner walls of the U-shaped frame, and first adjusting screws are threaded to both ends of the support plates. A V-shaped plate is located above the two first adjusting screws. This invention establishes a three-dimensional model of the boiler steel frame, heating surface equipment, steam box, and construction platform. Before construction, it simulates and analyzes the hoisting process, predicting potential conflicts and collisions, improving construction efficiency, shortening the construction cycle, reducing rework and waste, and significantly improving the safety, quality, and efficiency of installing heating surfaces in megawatt-class tower boilers.

Description

Technical Field

[0001] This invention relates to a method for installing boiler heating surfaces, and more particularly to a construction platform and method for boiler heating surfaces in thermal power plants based on BIM technology, belonging to the field of power plant boiler construction technology. Background Technology

[0002] 1,000 kW ultra-supercritical thermal power unit boilers generally adopt a tower layout, with an overall height exceeding 120 meters. The heating surfaces, as core components of the boiler, include water-cooled walls, superheaters, economizers, and reheaters. Their installation quality directly affects the safe and stable operation of the unit. However, existing construction techniques have the following prominent problems: ① High-altitude work involves a large amount of work and poses high safety risks. The heating surface components are large and heavy, distributed throughout various parts of the boiler. Traditional methods require extensive assembly and welding work at a height of 120 meters, resulting in long construction periods and high risks. ② Difficulty in controlling alignment precision. The gap between the heating surface tube panels must be controlled within 0.5 mm. Traditional hand-operated hoist adjustment methods have low precision, uneven force distribution, and cannot visually assess the stress state of each lifting point, easily leading to welding quality problems. ③ Low efficiency in hoisting the three components (superheater, economizer, and reheater). The superheater, economizer, and reheater can only be hoisted sequentially from top to bottom. Due to the limitations of the furnace roof structure, the lifting point positions need to be frequently changed. Traditional methods require multiple movements of the winch, resulting in low construction efficiency and high costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a construction platform and construction method for the heating surface of boilers in thermal power plants based on BIM technology, so as to improve work efficiency, shorten the construction cycle and reduce construction costs.

[0004] The technical solution adopted by this invention to solve the technical problem is as follows: A construction platform for the heating surface of a boiler in a thermal power plant based on BIM technology includes a construction platform and a first support leg. The first support leg is provided at the bottom of the construction platform. Horizontal braces are spaced apart inside the construction platform, and connecting rods are spaced apart between adjacent horizontal braces to form a grid-like construction platform. A U-shaped frame is provided on the left side of the construction platform. Rollers are connected to the bottom of both sides of the U-shaped frame via second support legs. Support plates are provided between the inner walls of the U-shaped frame. First adjusting screws are threaded to both ends of the support plates, and V-shaped plates are provided above the two first adjusting screws.

[0005] The first support leg on each side of the left side of the construction platform is provided with a support handle. The right end of the U-shaped frame is fitted onto the support handle and fixed by bolts on the U-shaped frame.

[0006] Sleeves are provided at the bottom of both ends of the V-shaped plate. The sleeves are fitted onto the top of the first adjusting screw and are fixed by the tightening bolts on the outer wall of the sleeves.

[0007] The top two ends of the V-shaped plate are respectively connected to pressure plates by bolts, thereby pressing and fixing the steam box.

[0008] The construction method for a BIM-based boiler heating surface construction platform in a thermal power plant includes the following steps: S1. Establish a three-dimensional model of the boiler steel frame, heating surface equipment, steam box and construction platform. Through visualization simulation, pre-analyze the entire process of heating surface pre-assembly, steam box alignment, medium-free tube hoisting, water-cooled wall hoisting, three-unit hoisting and positioning, and optimize and determine the assembly frame size, hoisting machinery configuration, hoisting point layout and construction platform position. S2. Based on the spacing of the boiler frame columns, pre-assemble the heat transfer surface tube panels in the assembly field. The vertical water-cooled walls and the tube assemblies without medium coating are pre-assembled into three-piece modules. The spiral water-cooled walls are assembled into one-piece modules with 4-5 tubes per unit. The superheater, economizer, and reheater serpentine tube arrays are assembled in multiple layers in the assembly field. S3. Hoist the steam box onto the V-shaped plate of the construction platform, and use the pressure plate to press and fix the steam box. Simultaneously rotate the two first adjusting screws to adjust the height and level of the V-shaped plate to achieve precise alignment between the steam box and the water-cooled wall tube panel. The alignment gap should not be greater than 0.5mm. Then, welding is performed. S4. Based on the hoisting scheme determined by BIM simulation, the non-medium-coated pipe components for the rear wall and right wall are hoisted by a 100t tower crane, with two 50t truck cranes assisting in the lifting; the non-medium-coated pipe components for the front wall and left wall are hoisted by two 15t winch cranes, with two 50t truck cranes assisting in the lifting; the components are flipped upright and hoisted to their positions by the main crane lifting and auxiliary lifting method. S5. The upper components of the vertical water-cooled wall are lifted by two 15t winches and two 50t truck cranes; the lower components are lifted by two 80t truck cranes; the spiral water-cooled wall is lifted by two 15t winches, two sets of 80t pulley blocks, and two 50t truck cranes. After the components are lifted into place, the alignment gap is precisely adjusted by an 8-screw adjustment device. Fine adjustments are made by rotating the screw nuts to ensure uniform force distribution. Welding is performed after the alignment is qualified. S6. Four 15t winches are arranged in two groups in front of and behind the furnace. The direction of the wire rope is changed by a 20t guide pulley. A 2m long I30 I-beam crossbeam is used to span the furnace top lifting beam. A 20t fixed pulley is fixed under the crossbeam as the lifting point. By moving the crossbeam and the fixed pulley, the position of the lifting point is changed, so that the superheater, economizer and reheater can be lifted from top to bottom in sequence, avoiding frequent movement of the winches.

[0009] The construction method of the boiler heating surface construction platform of the thermal power plant based on BIM technology, step S1 further includes: before the boiler top non-medium-coated pipe assembly is hoisted into place, the preset opening position of the fin of the assembly is used as the wire rope channel for the subsequent hoisting of the three equipments; the layout position of the construction platform and the U-shaped frame (6) is optimized by BIM simulation so that the construction of multiple steam box weld joints can be completed at a single platform position.

[0010] The construction method for a BIM-based boiler heating surface construction platform in a thermal power plant further includes: ① In step S3, the uniformity of force and levelness of the steam collecting box are judged by observing the position of the nuts of the two first adjusting screws; when there is a deviation in the gap, the angle of the steam collecting box is finely adjusted by differentially rotating the two first adjusting screws. ② The main crane lifting and auxiliary lifting method described in steps S4 and S5 includes: the main crane uses wire rope to lift the upper part of the component at multiple points, and the auxiliary lifting machine uses wire rope to lift the lower part of the component at multiple points; during the lifting process, the main crane and the auxiliary machine slowly lift the hook at the same time. After the component is 300mm off the ground, check the stress. After confirming that there is no problem, the main crane continues to lift, the auxiliary machine pauses the lifting and slowly extends the rod until the component is upright. Then the auxiliary machine lifting tool is removed, and the main crane continues to lift to the position. ③ Step S6 also includes: setting up an 80t truck crane and two 15t winches at zero meter of the boiler to lift the three-unit assembly, and then hoisting it into place by the winches; after each individual component of the three-unit assembly is hoisted into place, it is inspected with the corresponding header elevation as the benchmark, with the elevation error controlled within ±10mm and the spacing error controlled within ±5mm; after the overall hoisting is completed, the verticality and flatness are inspected, with the verticality error controlled within ±15mm and the flatness error controlled within ±5mm.

[0011] The construction method for a construction platform for the heating surface of a boiler in a thermal power plant based on BIM technology further includes: the screw adjustment device in step S5 consists of a slotted plate, a hook plate, a positioning nut, and a second adjusting screw. The end cross-section of the slotted plate is U-shaped. Hook plates are respectively provided on both sides of the bottom front end of the slotted plate. An end plate is provided at the center of the top right end of the slotted plate, and the right end of the end plate extends out of the right end of the slotted plate. A positioning nut is provided at the right end of the end plate. A matching second adjusting screw is threadedly connected inside the positioning nut. The hook plate is used to hook the lifting lugs at the upper and lower ends of the water-cooled wall assembly. The precise fine adjustment of the gap is achieved by rotating the second adjusting screw.

[0012] The positive and beneficial effects of this invention are: 1. Before construction, this invention establishes a three-dimensional model of the boiler steel frame, heating surface equipment, steam box and construction platform to simulate and analyze the hoisting process, predict possible conflicts and collisions, thereby optimizing the hoisting plan in advance, maximizing construction efficiency, shortening the construction cycle, and reducing rework and waste.

[0013] 2. This invention adopts the "off-site pre-combination + on-site secondary combination" model, which transforms a large number of high-altitude operations into ground operations, shortens the construction period by more than 30%, and improves the safe and civilized construction environment.

[0014] 3. This invention uses a lead screw adjustment device to replace the traditional hand-operated hoist for adjusting the water-cooled wall joint, achieving precise control of the joint gap to no more than 0.5mm, and making the stress state visible, significantly improving welding quality, ensuring construction safety, increasing construction efficiency, simplifying manufacturing, and reducing construction costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the U-shaped frame of the present invention; Figure 3 This is a diagram showing the usage state of the steam box and water-cooled wall of the present invention; Figure 4 This is a schematic diagram of the lead screw adjusting device of the present invention; Wherein: 1-Construction platform, 2-First support leg, 3-Horizontal brace, 4-Connecting rod, 5-Support handle, 6-U-shaped frame, 7-Support plate, 8-First adjusting screw, 9-Second support leg, 10-Roller, 11-V-shaped plate, 12-Pressure plate, 13-Sleeve, 14-Tightening bolt, 15-Slotted buckle plate, 16-Hook plate, 17-End plate, 18-Positioning nut, 19-Second adjusting screw, A-Steam box, B-Water-cooled wall. Detailed Implementation

[0016] The invention will be further explained and described below with reference to the accompanying drawings: Example 1, see Figures 1-3A construction platform for the heating surface of a boiler in a thermal power plant based on BIM technology includes a construction platform 1 and a first support leg 2. The first support leg 2 is set at the bottom of the construction platform 1. Horizontal braces 3 are set at intervals inside the construction platform 1, and connecting rods 4 are set at intervals between adjacent horizontal braces 3, thus forming a grid-like construction platform. This structure not only meets the load-bearing requirements, but also facilitates the standing of construction personnel and the placement of materials. A U-shaped frame 6 is set on the left side of the construction platform 1. Rollers 10 are connected to the bottom of both sides of the U-shaped frame 6 through second support legs 9. Support plates 7 are set between the inner walls of the U-shaped frame 6. First adjusting screws 8 are threadedly connected to both ends of the support plates 7, and V-shaped plates 11 are set above the two first adjusting screws 8.

[0017] Support handles 5 are respectively installed on the first support legs 2 on both sides of the left side of the construction platform 1. The support handles 5 are fitted onto the right end of the U-shaped frame 6 and fixed by bolts installed on the U-shaped frame 6.

[0018] Sleeves 13 are respectively provided at the bottom of both ends of the V-shaped plate 11. The sleeves 13 are fitted onto the top of the first adjusting screw 8 and are fixed by the tightening bolts 14 on the outer wall of the sleeves 13.

[0019] Pressure plates 12 are bolted to both ends of the top of the V-shaped plate 11 to press and fix the steam collection box A.

[0020] In the above description, extension plates are provided at both sides of the V-shaped plate and at both sides of the pressure plate, and through holes are provided at the outer edges of the V-shaped plate and the outer edges of the pressure plate, with bolts installed in the corresponding upper and lower through holes.

[0021] In the above description, the pressure plate is distributed in a V-shape and is symmetrically distributed with the V-shaped plate. The top two ends of the V-shaped plate 11 are connected to the pressure plate 12 by bolts, which cooperate with the V-shaped plate 11 to form a clamping and fixing of the steam box A.

[0022] In the above description, the sleeve is fitted onto the top of the first adjusting screw and is fixed by bolts on the outer wall of the sleeve.

[0023] In use, the steam collecting box A is hoisted onto the V-shaped plate 11 and fixed by the pressure plate 12; the height and level of the V-shaped plate 11 can be adjusted by rotating the two first adjusting screws 8 simultaneously to achieve precise alignment between the steam collecting box A and the water-cooled wall tube panel; at the same time, the uniformity of force on the steam collecting box A can be visually judged by observing the position of the nuts on the two first adjusting screws 8; when there is a deviation in the alignment gap, the angle of the steam collecting box A can be finely adjusted by differentially rotating the two first adjusting screws 8 to achieve precise alignment.

[0024] Example 2, see Figure 4The above-mentioned construction method for a BIM-based construction platform for the heating surface of a thermal power plant boiler includes the following steps: S1. Establish a three-dimensional model of the boiler steel frame, heating surface equipment, steam box and construction platform. Through visualization simulation, pre-analyze the entire process of heating surface pre-assembly, steam box alignment, medium-free tube hoisting, water-cooled wall hoisting, three-unit hoisting and positioning, and optimize and determine the assembly frame size, hoisting machinery configuration, hoisting point layout and construction platform position. In the above description, before the furnace top uncoated pipe assembly is hoisted into place, pre-set openings are made in the fins of the assembly to serve as wire rope channels for the subsequent hoisting of the three equipments. The layout of construction platform 1 and U-shaped frame 6 is optimized through BIM simulation, enabling multiple steam box weld joints to be constructed on a single platform, reducing the number of platform turnovers.

[0025] S2. Based on the spacing of the boiler frame columns, pre-assemble the heat transfer surface tube panels in the assembly field. The vertical water-cooled walls and the tube assemblies without medium coating are pre-assembled into three-piece modules. The spiral water-cooled walls are assembled into one-piece modules with 4-5 tubes per unit. The superheater, economizer, and reheater serpentine tube arrays are assembled in multiple layers in the assembly field. S3. Hoist the steam collection box A onto the V-shaped plate 11 of the construction platform, and press and fix the steam collection box A with the pressure plate 12. Simultaneously rotate the two first adjusting screws 8 to adjust the height and level of the V-shaped plate 11 to achieve precise alignment between the steam collection box A and the water-cooled wall tube panel. The alignment gap is no more than 0.5mm. Then, welding is performed. S4. Based on the hoisting scheme determined by BIM simulation, the non-medium-coated pipe components for the rear wall and right wall are hoisted by a 100t tower crane, with two 50t truck cranes assisting in the lifting; the non-medium-coated pipe components for the front wall and left wall are hoisted by two 15t winch cranes, with two 50t truck cranes assisting in the lifting; the components are flipped upright and hoisted to their positions by the main crane lifting and auxiliary lifting method. S5. The upper components of the vertical water-cooled wall are lifted by two 15t winches and two 50t truck cranes; the lower components are lifted by two 80t truck cranes; the spiral water-cooled wall is lifted by two 15t winches, two sets of 80t pulley blocks, and two 50t truck cranes. After the components are lifted into place, the alignment gap is precisely adjusted by an 8-screw adjustment device. Fine adjustments are made by rotating the screw nuts to ensure uniform force distribution. Welding is performed after the alignment is qualified. In the above description, the uncoated pipe assemblies on the rear wall and right wall are lifted by a 100t tower crane and two 50t truck cranes.

[0026] The front and left wall uncoated pipe assemblies are lifted using two 15t winches as the main hoist and two 50t truck cranes as a supporting unit.

[0027] The hoisting process employs a "main crane lifting + auxiliary lifting" method: the main crane uses wire ropes to lift the component from above at multiple points, while the auxiliary lifting machinery uses wire ropes to lift the component from below at multiple points. During the hoisting process, the main crane and auxiliary machinery simultaneously and slowly raise the hooks. After the component is 300mm off the ground, the stress on the hoisting machinery and the component is checked. Once confirmed to be in good condition, the main crane continues lifting, while the auxiliary machinery pauses lifting and slowly extends its boom until the component is upright. Then, the auxiliary machinery's lifting gear is removed, and the main crane continues lifting to the designated position.

[0028] S6. Four 15t winches are arranged in two groups in front of and behind the furnace. The direction of the wire rope is changed by a 20t guide pulley. A 2m long I30 I-beam crossbeam is used to span the furnace top lifting beam. A 20t fixed pulley is fixed under the crossbeam as the lifting point. By moving the crossbeam and the fixed pulley, the position of the lifting point is changed, so that the superheater, economizer and reheater can be lifted from top to bottom in sequence, avoiding frequent movement of the winches.

[0029] Step S1 also includes: before the furnace top non-medium-coated pipe assembly is hoisted into place, the pre-set opening position of the assembly fins is used as the wire rope channel for the subsequent hoisting of the three equipments; the layout of the construction platform 1 and the U-shaped frame 6 is optimized through BIM simulation so that multiple steam box weld joints can be completed at a single platform position.

[0030] It also includes: ① In step S3, the uniformity of force and levelness of the steam collecting box A are judged by observing the position of the nuts of the two first adjusting screws 8; when there is a deviation in the gap, the angle of the steam collecting box A is finely adjusted by differentially rotating the two first adjusting screws 8. ② The main crane lifting and auxiliary lifting method described in steps S4 and S5 includes: the main crane uses wire rope to lift the upper part of the component at multiple points, and the auxiliary lifting machine uses wire rope to lift the lower part of the component at multiple points; during the lifting process, the main crane and the auxiliary machine slowly lift the hook at the same time. After the component is 300mm off the ground, check the stress. After confirming that there is no problem, the main crane continues to lift, the auxiliary machine pauses the lifting and slowly extends the rod until the component is upright. Then the auxiliary machine lifting tool is removed, and the main crane continues to lift to the position. ③ Step S6 also includes: setting up an 80t truck crane and two 15t winches at zero meter of the boiler to lift the three-unit assembly, and then hoisting it into place by the winches; after each individual component of the three-unit assembly is hoisted into place, it is inspected with the corresponding header elevation as the benchmark, with the elevation error controlled within ±10mm and the spacing error controlled within ±5mm; after the overall hoisting is completed, the verticality and flatness are inspected, with the verticality error controlled within ±15mm and the flatness error controlled within ±5mm.

[0031] In the above description, four 15t winches are arranged in two groups in front of and behind the furnace; the direction of the winch wire rope is changed by a 20t guide pulley; a 2m long I30 I-beam crossbeam is used to span the furnace top lifting beam, and a 20t fixed pulley is fixed under the crossbeam as a lifting point; by moving the crossbeam and the fixed pulley to change the position of the lifting point, the superheater, economizer and reheater are lifted from top to bottom in sequence, avoiding frequent movement of the winches.

[0032] An 80t truck crane and two 15t winches are set up at zero meter of the boiler to lift the three components together. After being lifted, the winches are used to hoist them into place individually.

[0033] It also includes: the lead screw adjustment device in step S5 consists of a slotted buckle plate 15, a hook plate 16, a positioning nut 18, and a second adjusting screw 19. The end cross-section of the slotted buckle plate 15 is U-shaped. Hook plates 16 are respectively provided on both sides of the bottom front end of the slotted buckle plate 15. An end plate 17 is provided at the center of the top right end of the slotted buckle plate 15, and the right end of the end plate 17 extends out of the right end of the slotted buckle plate 15. A positioning nut 18 is provided at the right end of the end plate 17. A matching second adjusting screw 19 is connected to the positioning nut 18 by a thread. The hook plate 16 is used to hook the lifting lugs at the upper and lower ends of the water-cooled wall assembly. The precise fine adjustment of the gap is achieved by rotating the second adjusting screw 19.

[0034] In the above description, when in use, the lead screw adjustment device is attached to the water-cooled wall pipe, and the hook plate is hung on the panel of the water-cooled wall. Then, the adjacent pipe openings are adjusted by rotating the second adjustment screw, which can achieve precise fine adjustment of the gap between the openings. The device has a simple structure, extremely low cost, can be reused, and has high adjustment accuracy and visualized stress state.

[0035] This invention establishes a three-dimensional model of the boiler steel frame, heating surface equipment, steam box, and construction platform to simulate and analyze the hoisting process, predict possible conflicts and collisions, improve construction efficiency, shorten the construction cycle, reduce rework and waste, and significantly improve the safety, quality, and efficiency of the installation of heating surfaces for megawatt-class tower boilers.

Claims

1. A construction platform for the heating surface of a boiler in a thermal power plant based on BIM technology, comprising a construction platform (1) and a first support leg (2), characterized in that: The construction platform (1) is provided with a first support leg (2) at the bottom. The construction platform (1) is provided with cross braces (3) at intervals inside, and connecting rods (4) are provided at intervals between adjacent cross braces (3) to form a grid-like construction platform. A U-shaped frame (6) is provided on the left side of the construction platform (1). Rollers (10) are connected to the bottom of both sides of the U-shaped frame (6) through a second support leg (9). A support plate (7) is provided between the inner walls of the U-shaped frame (6). The two ends of the support plate (7) are respectively connected to a first adjusting screw (8) by thread, and a V-shaped plate (11) is provided above the two first adjusting screws (8).

2. The construction platform for the heating surface of a thermal power plant boiler based on BIM technology according to claim 1, characterized in that: The first leg (2) on the left side of the construction platform (1) is provided with a support handle (5), and the right end of the U-shaped frame (6) is fitted onto the support handle (5) and fixed by bolts on the U-shaped frame (6).

3. The construction platform for the heating surface of a thermal power plant boiler based on BIM technology according to claim 1, characterized in that: Sleeves (13) are respectively provided at the bottom of both ends of the V-shaped plate (11). The sleeves (13) are fitted on the top of the first adjusting screw (8) and fixed by the tightening bolts (14) on the outer wall of the sleeves (13).

4. The construction platform for the heating surface of a thermal power plant boiler based on BIM technology according to claim 3, characterized in that: The top two ends of the V-shaped plate (11) are respectively connected to pressure plates (12) by bolts, thereby pressing and fixing the steam box (A).

5. A construction method for a BIM-based boiler heating surface construction platform for a thermal power plant, as described in any one of claims 1-4, characterized in that... Includes the following steps: S1. Establish a three-dimensional model of the boiler steel frame, heating surface equipment, steam box and construction platform. Through visualization simulation, pre-analyze the entire process of heating surface pre-assembly, steam box alignment, medium-free tube hoisting, water-cooled wall hoisting, three-unit hoisting and positioning, and optimize and determine the assembly frame size, hoisting machinery configuration, hoisting point layout and construction platform position. S2. Based on the spacing of the boiler frame columns, pre-assemble the heat transfer surface tube panels in the assembly field. The vertical water-cooled walls and the tube assemblies without medium coating are pre-assembled into three-piece modules. The spiral water-cooled walls are assembled into one-piece modules with 4-5 tubes per unit. The superheater, economizer, and reheater serpentine tube arrays are assembled in multiple layers in the assembly field. S3. Hoist the steam box (A) onto the V-shaped plate (11) of the construction platform, and press and fix the steam box (A) with the pressure plate (12). Simultaneously rotate the two first adjusting screws (8) to adjust the height and level of the V-shaped plate (11) to achieve precise alignment between the steam box (A) and the water-cooled wall tube panel. The alignment gap is no more than 0.5mm. Then, welding is performed. S4. Based on the hoisting scheme determined by BIM simulation, the non-medium-coated pipe components for the rear wall and right wall are hoisted by a 100t tower crane, with two 50t truck cranes assisting in the lifting; the non-medium-coated pipe components for the front wall and left wall are hoisted by two 15t winch cranes, with two 50t truck cranes assisting in the lifting; the components are flipped upright and hoisted to their positions by the main crane lifting and auxiliary lifting method. S5. The upper components of the vertical water-cooled wall are lifted by two 15t winches and two 50t truck cranes; the lower components are lifted by two 80t truck cranes; the spiral water-cooled wall is lifted by two 15t winches, two sets of 80t pulley blocks, and two 50t truck cranes. After the components are lifted into place, the alignment gap is precisely adjusted by an 8-screw adjustment device. Fine adjustments are made by rotating the screw nuts to ensure uniform force distribution. Welding is performed after the alignment is qualified. S6. Four 15t winches are arranged in two groups in front of and behind the furnace. The direction of the wire rope is changed by a 20t guide pulley. A 2m long I30 I-beam crossbeam is used to span the furnace top lifting beam. A 20t fixed pulley is fixed under the crossbeam as the lifting point. By moving the crossbeam and the fixed pulley, the position of the lifting point is changed, so that the superheater, economizer and reheater can be lifted from top to bottom in sequence, avoiding frequent movement of the winches.

6. The construction method for a BIM-based boiler heating surface construction platform in a thermal power plant, as described in claim 5, is characterized in that: Step S1 also includes: before the furnace top non-medium-coated pipe assembly is hoisted into place, the pre-set opening position of the assembly fin is used as the wire rope channel for the subsequent hoisting of the three equipments; the arrangement position of the construction platform (1) and the U-shaped frame (6) is optimized by BIM simulation so that multiple steam box weld joints can be completed at a single platform position.

7. A construction method for a BIM-based boiler heating surface construction platform for a thermal power plant, as described in claim 5, characterized in that... Also includes: ① In step S3, the uniformity of force and levelness of the steam box (A) are judged by observing the nut positions of the two first adjusting screws (8); When there is a deviation in the gap between the two valves, the angle of the steam collection box (A) is finely adjusted by differentially rotating the two first adjusting screws (8); ② The main crane lifting and auxiliary lifting method described in steps S4 and S5 includes: the main crane uses wire rope to lift the upper part of the component at multiple points, and the auxiliary lifting machine uses wire rope to lift the lower part of the component at multiple points; during the lifting process, the main crane and the auxiliary machine slowly lift the hook at the same time. After the component is 300mm off the ground, check the stress. After confirming that there is no problem, the main crane continues to lift, the auxiliary machine pauses the lifting and slowly extends the rod until the component is upright. Then the auxiliary machine lifting tool is removed, and the main crane continues to lift to the position. ③ Step S6 also includes: setting up an 80t truck crane and two 15t winches at zero meter of the boiler to lift the three-unit assembly, and then hoisting it into place by the winches; after each individual component of the three-unit assembly is hoisted into place, it is inspected with the corresponding header elevation as the benchmark, with the elevation error controlled within ±10mm and the spacing error controlled within ±5mm; after the overall hoisting is completed, the verticality and flatness are inspected, with the verticality error controlled within ±15mm and the flatness error controlled within ±5mm.

8. A construction method for a BIM-based boiler heating surface construction platform for a thermal power plant, as described in claim 5, characterized in that, It also includes: the lead screw adjustment device in step S5 is composed of a slotted buckle plate (15), a hook plate (16), a positioning nut (18), and a second adjusting screw (19). The end section of the slotted buckle plate (15) is U-shaped. Hook plates (16) are respectively provided on both sides of the bottom front end of the slotted buckle plate (15). An end plate (17) is provided at the center of the top right end of the slotted buckle plate (15), and the right end of the end plate (17) extends out of the right end of the slotted buckle plate (15). A positioning nut (18) is provided at the right end of the end plate (17). A matching second adjusting screw (19) is connected to the positioning nut (18) by a thread. The hook plate (16) is used to hook the lifting lugs at the upper and lower ends of the water-cooled wall assembly. The precise fine adjustment of the gap is achieved by rotating the second adjusting screw (19).

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