A hoisting system for a duct within a shaft and a method of operating the same

Abstract

The application discloses a hoisting system of air pipe in a vertical shaft, which comprises a rectangular hoisting base, the bottom of the hoisting base is connected with a rectangular lifting base through a lifting mechanism, the center of the top of the hoisting base is provided with a platform frame with a rectangular structure, a plurality of small whole sections formed by a plurality of common air pipe sections which are connected with each other are placed in the platform frame, a plurality of groups of telescopic screw one are evenly distributed on the inner walls of the four peripheries of the platform frame, the telescopic screw one is supported and tightly abuts on the outer walls of the small whole sections in the platform frame, hooks one which are fixed on the hoisting base and hooks two which are fixed on the bottom of the lifting base are evenly arranged on the four peripheries of the platform frame, and the platform frame is connected with a synchronous electric hoist mechanism through the hooks one, the hooks two and a steel wire rope.The four peripheries of the small whole sections are tightly and stably clamped by the telescopic screw one, and the platform frame is assisted to descend by guide rollers; meanwhile, the telescopic screw two and Y-shaped support frames at the end of the telescopic screw two are arranged, so that temporary parking in the vertical pipe shaft is realized.

Description

Technical Field

[0001] This invention relates to the field of building engineering, specifically to a hoisting system for air ducts in vertical shafts and its operating method. Background Technology

[0002] As a crucial medium for transporting hot and cold air, air ducts are an indispensable part of ventilation, heating, and air conditioning systems, and also an important component of smoke prevention, smoke extraction, and dust removal projects. However, the current trend in building design, prioritizing space utilization, is increasingly compressing the space available for electromechanical installation pipelines, thus increasing the difficulty of pipe installation. Therefore, it is necessary to innovate in installation tools, fixtures, and processes to ensure installation quality.

[0003] In traditional techniques, the installation of ductwork in a riser shaft is typically accomplished by first installing the hoisting supports and then lowering the duct sections into the riser shaft in batches. The bottommost hoisting support is installed first, followed by the lowering of the bottommost duct section. This process of installing the hoisting supports and then the duct sections in the riser shaft is then completed.

[0004] However, this method has the following drawbacks:

[0005] 1. When installing ductwork in a riser shaft surrounded by walls on three sides, it is impossible to solve the problem of bolt tightening and welding operations being impossible due to space constraints between the back and sides of the ductwork and the narrow shaft. In a riser shaft with a wall on the back and open on three sides, bolts can be installed on three sides (the side facing the construction personnel + the two sides), but the bolts on the back cannot be tightened. This results in a large amount of air leakage in the ductwork, causing energy waste, and may lead to condensation and frost, affecting the corrosion resistance and service life of the ductwork material.

[0006] 2. In addition, if an automatic telescopic mechanism is used to tighten the connecting bolts, the limited operating space in the riser well means that the motor cannot be too large, which affects the torque of tightening the bolts and makes it impossible to guarantee the torque.

[0007] 3. During installation in the riser shaft, parts may fall off or loosen due to collisions, causing damage to the duct section and affecting its performance. Alternatively, the duct section may suddenly fall from a height, causing a safety accident.

[0008] 4. The traditional method of installing supports and hangers in the pipe shaft first and then installing the duct section is used. In order to save construction time, the lower support is installed at the same time and the duct is hoisted simultaneously. At the same time, there may be flange tightening work teams. This results in a large number of workers being distributed in the pipe shaft. The workload of workers in the riser pipe shaft is large, the construction time is long, and the worker efficiency is low. At the same time, the pipe shaft is deep and the lack of fixed points for safety ropes leads to frequent safety accidents. Summary of the Invention

[0009] The purpose of this invention is to design a small, semi-automated platform for connecting and hoisting duct sections within a shaft, thereby relocating duct connection points from the traditional shaft to rooftops or other open, safe, and operable areas (this invention primarily uses rooftops as an example). This optimized duct installation method ensures the airtightness of individual ducts. Furthermore, the device described in this invention increases construction safety and shortens the construction period. Therefore, this invention provides a hoisting system for ducts within a vertical shaft and its operating method.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A hoisting system for ductwork in vertical shafts is suitable for installing ductwork in riser shafts. The system includes a hoisting platform with a rectangular hoisting base. The bottom of the hoisting base is connected to a rectangular lifting base via a lifting mechanism. A rectangular platform frame is located at the center of the top of the hoisting base. Several interconnected sections of ordinary ductwork are placed within the platform frame to form small, continuous sections. Several sets of telescopic screws are evenly distributed on the inner walls of the platform frame, supporting and tightly abutting against the outer walls of the small, continuous sections within the platform frame. Several sets of hooks are evenly distributed around the platform frame, fixed to the hoisting base and several sets of hooks are fixed to the bottom of the lifting base. The platform frame is connected to a synchronous electric winch mechanism via hooks and wire ropes.

[0012] Preferably, the rectangular lifting base is provided with at least three sets of telescopic screw rods on all four sides. After the telescopic screw rods are extended and retracted, they are used to temporarily erect the lifting base in the riser shaft above the opening of the floor to which it stops.

[0013] Preferably, the left and right sides of the lifting base are provided with Y-shaped support frames on the corresponding telescopic screws. The Y-shaped support frames abut against the well wall of the three-sided walled riser through the telescopic screws, so that the suspended lifting base is temporarily supported, thereby temporarily stopping the suspended hoisting platform in the riser.

[0014] Preferably, one end of the Y-shaped support frame is connected to the telescopic screw, and the other end adopts a Y-shaped fork. A rubber pad is provided on the Y-shaped fork. After the Y-shaped fork is unfolded, the rubber pad contacts the inner wall of the section of the riser well to increase friction and achieve an anti-slip effect.

[0015] Preferably, guide rollers are provided on the telescopic screws on the left and right sides and the back side of the lifting base. The guide rollers are arranged alternately in parallel with the Y-shaped support frame. The guide rollers are used to assist the platform frame in descending in the riser well, improve the stability of the hoisting platform, and avoid the hoisting platform from directly colliding with the well wall of the riser well.

[0016] Preferably, the lifting mechanism includes a hydraulic lifting mechanism, a cylinder lifting mechanism, or a screw lifting mechanism disposed between the lifting base and the hoisting base.

[0017] Preferably, a gantry crane is provided above the riser shaft. The two sides of the gantry crane are installed on the vertical shaft opening on the roof surface through support frames. The gantry crane is equipped with two sets of synchronously controlled lifting devices. The lifting devices are located directly above the riser shaft. The ordinary air duct sections to be installed are connected one by one to the small whole sections in the platform frame through the lifting devices. The large whole section is gradually stacked and spliced ​​in the platform frame by stacking and splicing while lowering the platform frame.

[0018] Preferably, the platform frame is equipped with a weight sensing device, a gravity limiter, a levelness monitoring module, a running speed detection module, and a load-bearing sensing module. The weight sensing device converts the tension signal of the wire rope attached to the hoisting mechanism during the hoisting of the platform frame into an electrical signal and sends it to the controller. Under normal circumstances, the tension of the wire rope sensed by the weight sensing device is directly proportional to the length of the wire rope retracted by the hoisting mechanism. Once the wire rope encounters a support frame or is obstructed during hoisting due to changes in the shaft structure dimensions, the tension signal sensed by the weight sensing device continuously decreases under the drive of the hoisting mechanism, while the wire rope retraction length signal remains unchanged. When it exceeds a certain proportional range, the controller sends a command to control the gravity limiter to cut off the power supply to the hoisting mechanism, suspending the hoisting operation. The hoisting operation will continue only after the obstacle is removed, thereby preventing wire rope damage during hoisting. To prevent breakage or damage to the supports and floor slabs inside the shaft, the safety of the hoisting system during vertical hoisting is further ensured. The levelness monitoring module, running speed detection module, and load-bearing sensing module are all connected to the control terminal via signals to achieve emergency stop. The levelness monitoring module feeds back to the control terminal when the tilt of the platform frame exceeds 10°, and the control terminal sends a command to the winch system to stop hoisting. The running speed detection module can identify the descent speed of the platform frame in the riser shaft. When the running speed detection module detects that the descent speed of the platform frame exceeds 1m / min, it feeds back to the control terminal, and the control terminal sends a command to the winch system to stop hoisting. The load-bearing sensing module is located at the bottom of the platform frame and is used to detect the weight of the large section inside the platform frame. When the weight of the large section exceeds 2 tons, it automatically sounds an alarm and feeds back to the control terminal, and the control terminal sends a command to the winch system to stop hoisting.

[0019] Preferably, the platform frame is provided with a scale, which allows workers to observe the depth at which the bottom of the entire section is clamped within the platform frame, thereby presetting the height at which the hoisting platform can be compressed and removed within the section of the riser shaft.

[0020] An operation method for a hoisting system for ventilation ducts inside a vertical shaft, comprising the following steps:

[0021] Bulk duct sections are defined as ordinary duct sections, using 0.5 to 1m sections; multiple ordinary duct sections are spliced ​​together to form small sections of 2 to 3m, and multiple small sections are connected to form large sections of 20 to 30m. The large sections are the specifications that the platform frame can be lowered into the riser shaft in one go.

[0022] S0: Before use, the hoisting platform needs to undergo a trial load test. During the trial load test, a full-load test run is conducted at the maximum speed limit, and testing and maintenance are carried out. The testing and maintenance includes bolt tightening, expansion joint testing, control terminal testing, and checking whether the signal feedback of each module is normal.

[0023] S1: First, connect two to three sections of ordinary air duct into a small whole section by flanges and bolts at the vertical shaft opening on the roof surface, and then put it into the platform frame of the hoisting platform;

[0024] S2: By adjusting the extension length of the telescopic screw on the inner wall of the platform frame, it can be made to fit tightly against the outer wall of the ordinary air duct section on the small section inside the platform frame, so that the small section will not shake inside the platform frame.

[0025] S3: Connect the two sets of synchronous electric winches symmetrically set on the vertical shaft opening on the roof to hooks one and two on the hoisting base and lifting base of the hoisting platform respectively through steel wire ropes. The platform frame located on the hoisting base and lifting base is placed into the vertical pipe shaft by synchronously controlling the steel wire ropes through the synchronous electric winches.

[0026] S4: Before the platform frame descends into the riser, adjust the extension length of the second telescopic screw on the back side of the lifting base under the platform frame to ensure that the guide roller connected to the second telescopic screw on the back side of the lifting base is in close contact with the well wall of the riser, thus facilitating the smooth descent of the platform frame into the riser. At the same time, adjust the extension length of the second telescopic screw on the left and right sides of the lifting base under the platform frame to ensure that the total width of the guide roller connected to the second telescopic screw on the left and right sides of the lifting base maintains a 1cm gap with the width of the riser, which can prevent blockage caused by foreign objects in the riser.

[0027] S5: Workers can use the open area on the roof to select a reasonable flange bolt fixing plane to assemble ordinary air duct sections according to their own conditions and the length of the assembly is determined according to actual needs. The ordinary air duct sections to be stacked or the small sections that have been assembled are suspended by two sets of synchronously controlled lifting mechanisms on the gantry crane. After flanges are put on the small sections at the top of the platform frame, they are connected by bolts.

[0028] S6: Then, by installing and lowering the platform frame, several small sections or ordinary duct sections are gradually spliced ​​together to form a large section. Then, the platform frame holding the bottom of the large section (the initially held small section has become the bottom of the large section, and will be described as the "bottom of the large section" below) is hoisted into the riser shaft by the synchronous electric winch mechanism at the vertical shaft opening on the roof.

[0029] S7: When the platform frame needs to be temporarily docked in a riser shaft with three walls, the hoisting platform extends, that is, the distance between the hoisting base and the lifting base is extended through the hydraulic lifting mechanism; then the extension length of the telescopic screws on the left and right sides of the lifting base is adjusted so that the Y-shaped support frame connected to the telescopic screws on the left and right sides of the lifting base contacts the inner wall of the riser shaft, thereby opening the Y-shaped fork of the Y-shaped support frame, and the rubber pad on the Y-shaped fork contacts the inner wall of the riser shaft to achieve anti-slip, thus realizing the temporary docking of the platform frame in the riser shaft through multiple Y-shaped support frames opened on the left and right sides of the lifting base;

[0030] Meanwhile, in another working condition of S7, when the platform frame needs to be temporarily parked in a riser shaft with a wall on the back and open on the other three sides, the hoisting platform extends, that is, the distance between the hoisting base and the lifting base is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screws on the four sides of the lifting base is adjusted so that the length of the telescopic screws can be placed on the edge floor slab of the floor opening of the riser shaft or on the bottom surface of the riser shaft, thereby playing a more stable role.

[0031] S8: Two sets of symmetrically arranged synchronous electric winches use steel wire ropes to gradually lower the platform frame holding the bottom of the large section to the position to be installed in the riser well.

[0032] S9: The hoisting platform extends, that is, the distance between the hoisting base and the lifting base is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screws on the four sides of the lifting base is adjusted, and the length of the telescopic screws on the lifting base reaches the ground of the section of the riser or the opening of the section of the riser supported by the method of S7, so that the platform frame holding the bottom of the whole section forms a stable stop in the section of the riser.

[0033] It should be noted that the distance between the ground of this section of riser and the platform frame holding the bottom of the large section must be greater than the overall height of the hoisting platform after compression by the hydraulic lifting mechanism + 0.5 meters, so as to provide conditions for the removal of the hoisting platform;

[0034] S10: Secure the exposed section of the entire manhole;

[0035] S11: Then dismantle the hoisting platform. Specifically, the telescopic screw inside the platform frame rotates inward to loosen the large section bottom it is clamping. Control the hydraulic lifting mechanism to retract so that the hoisting base connected to the platform frame gradually approaches the lifting base, thereby reducing the overall height of the hoisting platform. This process requires controlling the hydraulic speed to be no more than 0.2m / s. At this time, the large section bottom that was clamped inside the platform frame is exposed. Then, fix the exposed large section bottom inside the riser well.

[0036] Because the distance between the ground of the riser section and the platform frame holding the bottom of the large section is greater than the overall height of the compressed hoisting platform plus 0.5 meters, the compressed hoisting platform can be removed from below the large section once the large section inside the riser is fixed.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. This invention uses a synchronously controlled electric winch and guide rollers to assist the platform frame in descending smoothly in the riser shaft, preventing the platform from shaking and colliding with the shaft wall during hoisting. The platform frame is stably clamped around a pair of duct sections by a telescopic screw, ensuring that the duct sections are fixed in place within the platform and do not shake. This also ensures that the platform does not shake during hoisting within the shaft, thus increasing safety.

[0039] 2. This invention enables temporary stopping inside the riser well by setting up a telescopic screw and a Y-shaped support frame at its end, which facilitates temporary operation and is therefore more suitable for on-site construction.

[0040] 3. This invention saves labor and facilitates construction by installing a gantry crane above the riser shaft. Simultaneously, the connection point is transformed from the narrow space within the traditional shaft into a safe and open area, improving work efficiency and avoiding various accidents caused by traditional shaft-based operations.

[0041] 4. The present invention can realize the lifting between the hoisting base and the lifting base through the lifting mechanism, so that after the air duct is installed, the hoisting platform can be compressed through the lifting mechanism to realize removal and turnover, thereby increasing the utilization rate and saving construction time.

[0042] 5. This invention uses a gantry crane and a hoisting platform to transport the assembled duct sections to the riser shaft, which avoids the problem of difficulty in bolting or welding in the riser shaft. It reduces the number of bolts that cannot be fixed due to space limitations in traditional operations to about 7%, thus reducing air leakage to 10% of the traditional amount, improving construction quality and the airtightness of the duct system.

[0043] 6. The method described in this invention is not only suitable for bolted connections of angle steel flanges, but also for various metal, non-metal, or composite ducts with thin steel plate flanges, welding, and insert strip connections, making it widely applicable. Attached Figure Description

[0044] Figure 1 This is a front view schematic diagram of the hoisting system for air ducts in a vertical shaft and its cooperation with a gantry crane, as proposed in this invention.

[0045] Figure 2 This is a three-dimensional structural diagram of a hoisting system for air ducts in a vertical shaft, in conjunction with a gantry crane, as proposed in this invention.

[0046] Figure 3 for Figure 2 A magnified structural diagram of A in the middle;

[0047] Figure 4 This is a three-dimensional structural diagram of the platform in a hoisting system for internal ventilation ducts in a vertical shaft, as proposed in this invention.

[0048] Figure 5 for Figure 4 A magnified structural diagram of B in the diagram;

[0049] Figure 6 This is a front view schematic diagram of the platform in the hoisting system for air ducts inside a vertical shaft proposed in this invention;

[0050] Figure 7 This is a top view of the platform structure in the hoisting system for air ducts inside a vertical shaft proposed in this invention.

[0051] Figure 8 for Figure 7 A cross-sectional structural diagram.

[0052] The numbers in the diagram are as follows:

[0053] 1. Ordinary duct section; 2. Platform frame; 3. Lifting base; 4. Y-shaped support frame; 5. Gantry crane; 6. Hook 1; 7. Hook 2; 8. Lifting base; 9. Guide roller; 10. Telescopic screw 1; 11. Vertical shaft opening on the roof; 12. Lifting platform; 13. Riser shaft; 14. Telescopic screw 2. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0055] like Figures 1 to 8As shown, this invention provides a hoisting system for air ducts in a vertical shaft, suitable for installing air ducts in a riser shaft 13. The system includes a hoisting platform 12, which comprises a rectangular hoisting base 3. The bottom of the hoisting base 3 is connected to a rectangular lifting base 8 via a lifting mechanism. A rectangular platform frame 2 is located at the center of the top of the hoisting base 3. Several interconnected sections of ordinary air duct segments 1 form small, continuous sections within the platform frame 2. Several sets of telescopic screws 10 are evenly distributed on the inner walls of the platform frame 2. The ends of the telescopic screws 10... A rubber pad is provided, and the telescopic screw 10 supports and closely abuts against the outer wall of the small section inside the platform frame 2. The rubber pad at the end of the telescopic screw 10 can reduce the damage to the outer wall of the small section when the telescopic screw 10 is in close contact with the outer wall of the small section. Several sets of hooks 1 6 fixed on the hoisting base 3 and several sets of hooks 2 7 fixed on the bottom of the lifting base 8 are evenly provided around the platform frame 2. The platform frame 2 is connected to the synchronous electric winch mechanism or electric hoist mechanism for lifting and lowering through hooks 1 6, hooks 2 7 and wire rope.

[0056] Furthermore, to facilitate the connection of the ordinary duct section 1 to be installed with the top of the small section within the platform frame 2 during operation, a gantry crane 5 is installed above the riser shaft 13. The gantry crane 5 is mounted on both sides of the vertical shaft opening 11 on the roof via support frames. Two sets of synchronously controllable lifting devices are installed on the gantry crane 5. Monitoring devices can also be installed on the lifting devices for real-time control, enabling synchronous operation of the lifting pulley groups on the lifting devices and ensuring the platform is lowered smoothly. The lifting devices are located directly above the riser shaft 13, suspending the ordinary duct section 1 to be installed at a suitable operating height for the worker. This allows the worker to connect each ordinary duct section 1 to the flange at the top of the small section within the platform frame 2, and then tighten the bolts around the flange. The large section is gradually formed by stacking and splicing the platform frame 2 within the platform frame 2 while lowering it.

[0057] In this invention, the bulk duct section is defined as ordinary duct section 1, with a length of 0.5-1 meter. Several ordinary duct sections 1 are stacked and connected to each other at the vertical shaft opening 11 on the roof surface to form a small complete section. The small complete section is placed in the platform frame 2, and the small complete section to be installed (which can be assembled on-site by workers at the vertical shaft opening on the roof surface or prefabricated in the factory) is lifted by a gantry crane and connected to the small complete section in the platform frame 2, or the ordinary duct section 1 to be installed is connected to the small complete section in the platform frame 2. The operation is carried out by installing one section and lowering it at a time, while installing and lowering. Several small complete sections are stacked to form a large complete section of 20-30 meters. The large complete section is lowered as a whole in the platform frame 2 until it reaches the preset height of the riser shaft 13 of that section.

[0058] In traditional technology, bulk ordinary duct sections 1 are transported downwards and fixed with supports within the riser shaft. In the riser shaft with walls on three sides, when connecting bulk ordinary duct sections 1 to each other, the limited space between the back and sides of the ordinary duct section 1 and the narrow shaft makes bolt tightening and welding operations impossible, resulting in a large amount of air leakage and energy waste. This may also lead to condensation and frost, affecting the corrosion resistance and service life of the duct material. Moreover, although automatic telescopic machinery can be used to tighten the connecting bolts, the limited operating space in the riser shaft restricts the size of the motor, thus affecting the torque for tightening the bolts and making it impossible to guarantee the torque.

[0059] This invention solves the problem in traditional technologies where ductwork is hoisted directly onto flanges, leading to deformation or detachment during hoisting due to the thin flange walls and heavy ductwork. This is achieved by pre-assembling small sections at the factory or by having workers connect several loose ordinary duct sections 1 into small sections using flanges and bolts at the vertical shaft opening on the roof. The ductwork is then placed into the platform frame 2 of the hoisting platform 12. Furthermore, by using a gantry crane combined with a synchronous winch mechanism above the riser shaft, semi-automatic hoisting of duct modules can be achieved, saving labor and facilitating construction. The connection point is also moved from the traditional shaft to a safe and open area, further reducing labor costs. By using a gantry crane and hoisting platform to transport the assembled duct sections to the riser shaft, the difficulty of bolting or welding within the riser shaft is avoided, improving work efficiency and reducing air leakage to 10% of the traditional method, thus improving construction quality.

[0060] Furthermore, in order to ensure that the platform frame 2 can be stably placed at the bottom of the riser shaft 13, the present invention provides at least three sets of telescopic screws 14 on all four sides of the rectangular lifting base 8. After the telescopic screws 14 are extended and retracted, they are used to temporarily erect the lifting base 8 in the riser shaft 13 at the upper edge of the opening of the floor where it stops.

[0061] Y-shaped support frames 4 are provided on the telescopic screws 14 on the left and right sides of the lifting base 8. The Y-shaped support frames 4 abut against the well wall of the riser 13 surrounded by three walls through the telescopic screws 14, so that the suspended lifting base 8 is temporarily supported, thereby temporarily stopping the suspended hoisting platform 12 in the riser 13. One end of the Y-shaped support frame 4 is connected to the telescopic screws 14, and the other end adopts a Y-shaped fork. A rubber pad is provided on the Y-shaped fork. After the Y-shaped fork is unfolded, the rubber pad contacts the inner wall of the section of the riser 13 to increase friction and achieve an anti-slip effect.

[0062] In addition, to further assist the platform frame 2 in its smooth descent within the riser well 13, such as... Figure 6 and7 As shown, guide rollers 9 are provided on the telescopic screws 14 on the left and right sides and the back side of the lifting base 8. The guide rollers 9 are arranged alternately in parallel with the Y-shaped support frame 4. Figure 6 The diagram shows the exposed guide rollers 9 after the Y-shaped support frame 4 has been removed (the alternating arrangement in this invention can be staggered according to the number of telescopic screws 14 on the lifting base 8), and they do not affect each other; the guide rollers 9 are used to assist the platform frame 2 in descending within the riser well 13, improving the stability of the hoisting platform 12. Besides preventing the platform frame 2 from swaying within the riser well 13, they also assist the platform frame 2 in descending smoothly within the riser well 13. This avoids direct collision between the hoisting platform 12 and the well wall of the riser well 13.

[0063] When the platform frame 2 needs to be temporarily moored in the riser shaft 13 with a wall on the back and the other three sides open, the hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screw 14 on the four sides of the lifting base 8 is adjusted so that the length of the telescopic screw 14 can be supported on the edge floor slab of the floor opening of the riser shaft 13 or on the bottom surface of the riser shaft 13, thereby playing a more stable role.

[0064] When the platform frame 2 needs to be temporarily suspended inside the riser shaft 13 with three walls, the hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended through the hydraulic lifting mechanism; then the extension length of the telescopic screws 14 on the left and right sides of the lifting base 8 is adjusted so that the Y-shaped support frame 4 connected to the telescopic screws 14 on the left and right sides of the lifting base 8 contacts the inner wall of the riser shaft 13, thereby opening the Y-shaped fork of the Y-shaped support frame 4, and the rubber pad on the Y-shaped fork contacts the inner wall of the riser shaft 13 to generate friction and achieve an anti-slip effect. In this way, the platform frame 2 can be temporarily suspended inside the riser shaft 13 through multiple Y-shaped support frames 4 opened on the left and right sides of the lifting base 8; the Y-shaped forks in this invention can be connected by springs, which can achieve a tight fit with the inner wall of the riser shaft 13, and when the temporary stop is canceled, the springs can return to the initial state.

[0065] This invention provides another way to temporarily stop the pipe in the riser well by setting up a telescopic screw and a Y-shaped support frame at its end, which facilitates temporary operation and is therefore more suitable for on-site construction.

[0066] It is worth noting that since the length of the riser shaft 13 can be set in segments according to the length of the overall shaft, the floor surface of the current section of the riser shaft 13 in this invention only represents the bottom of the current section of the riser shaft in the overall shaft, rather than the actual floor surface.

[0067] During installation in traditional riser shafts, parts often fall off or loosen due to collisions, causing damage to the duct section and affecting its performance. Alternatively, the duct section may suddenly fall from a height, causing a safety accident.

[0068] This invention utilizes a synchronized electric winch and guide rollers 9 to assist the platform frame 2 in a smooth descent within the riser shaft 13. This prevents the platform from colliding with the shaft wall due to swaying of the flexible steel wire rope used for hoisting, thus ensuring the platform remains stable within the shaft and significantly enhancing safety. Furthermore, the total width of the guide rollers 9 connected to the telescopic screws 14 on both sides of the lifting base 8 maintains a 1cm gap with the width of the riser shaft 13. This prevents obstruction during the descent of the lifting platform 12 caused by large deviations in the shaft's verticality, rough inner walls, or the presence of dust, debris, or falling wood within the riser shaft 13.

[0069] Furthermore, the lifting mechanism described in this invention includes other lifting mechanisms such as hydraulic lifting mechanisms, cylinder lifting mechanisms, or screw lifting mechanisms disposed between the lifting base 8 and the hoisting base 3. These lifting mechanisms are existing technologies and not part of the technical features of this invention, therefore they will not be elaborated upon here. The lifting mechanism described in this invention is a hydraulic lifting mechanism. When the hoisting platform 12 of this invention descends to a preset height within the riser shaft 13, or when the large section is clamped to the designed installation height, the hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended through the hydraulic lifting mechanism; this opens the distance between the hoisting base 3 and the lifting base 8, and then the extension length of the telescopic screws 14 on the four sides of the lifting base 8 is adjusted so that the length of the telescopic screws 14 can be supported on the edge floor slab of the floor opening within the riser shaft 13 or other suitable locations, thereby providing greater stability; thus transporting the large section in the platform frame 2 to the designed location for subsequent installation.

[0070] It is important to note that the hydraulic lifting mechanism should ensure that the distance between the hoisting base 3 and the lifting base 8 is greater than the length of the ordinary duct section 1 fitted into the platform frame 2, so that the hoisting platform 12 can be easily removed. The lifting mechanism allows for the raising and lowering of the hoisting base and the lifting base, facilitating the removal and relocation of the hoisting platform after duct installation, thus increasing utilization and saving construction time.

[0071] Furthermore, the present invention also includes a weight sensing device and a gravity limiter. The weight sensing device can convert the tension signal of the wire rope attached to the hoisting mechanism during the hoisting of the platform frame 2 into an electrical signal and send it to the controller. Under normal circumstances, the tension of the wire rope sensed by the weight sensing device is directly proportional to the length of the wire rope retracted by the hoisting mechanism. Once the wire rope encounters the support frame or is obstructed due to changes in the shaft structure dimensions during hoisting, the tension signal sensed by the weight sensing device continuously decreases under the drive of the hoisting mechanism, while the wire rope retraction length signal remains unchanged. When it exceeds a certain proportional range, the controller sends a command to control the gravity limiter to cut off the power supply of the hoisting mechanism, suspend the hoisting operation, and resume the hoisting operation after the obstacle is removed. This avoids the wire rope from breaking or damaging the supports and floor slabs inside the shaft during hoisting, further ensuring the safety of the hoisting system during vertical hoisting.

[0072] Furthermore, the platform frame 2 is equipped with a levelness monitoring module, a running speed detection module, and a load-bearing sensor module, all connected to the control terminal via signals for emergency stopping. The levelness monitoring module sends feedback to the control terminal when the tilt of the platform frame 2 exceeds 10°, prompting the control terminal to send a command to the winch system to stop hoisting. The running speed detection module identifies the descent speed of the platform frame 2 within the riser shaft. When the detection module detects a descent speed exceeding 1 m / min, it sends feedback to the control terminal, which then sends a command to the winch system to stop hoisting. The load-bearing sensor module records the position of the platform frame 2 at its bottom and detects the weight of the largest section within the platform frame 2. When the weight of the largest section exceeds 2 tons, an alarm is automatically triggered and feedback is sent to the control terminal, which then sends a command to the winch system to stop hoisting.

[0073] Traditional installation processes rely entirely on manual identification and transportation, which does not align with the trend of automation and intelligent development in the construction industry. This invention, by installing multiple modules on a hoisting platform and feeding signals back to the control terminal, can effectively improve work efficiency and installation quality, automate the entire construction process, and control the project cycle.

[0074] Furthermore, a scale is provided on the outside of the platform frame 2 of the present invention. This scale allows workers to observe the depth of the entire section within the platform frame 2 from the platform frame 2, thereby setting the height at which the hoisting platform 12 can be compressed and withdrawn within the section of the riser well 13.

[0075] The operation method of the hoisting system for the vertical shaft air duct of the present invention includes the following steps:

[0076] The bulk duct section is defined as ordinary duct section 1, which uses 0.5 to 1m duct sections; multiple ordinary duct sections 1 are spliced ​​together to form a small whole section of 2 to 3m, and multiple small whole sections are connected to form a large whole section of 20 to 30m. The large whole section is the specification of the platform frame 2 that can be lowered into the riser shaft in one go.

[0077] S0: Before use, the hoisting platform 12 needs to undergo a trial load test. During the trial load test, a full-load test run is conducted at the maximum speed limit. The hoisting platform is then run unloaded to check the stability of its lifting. The unloaded test run speed should not exceed 0.5m / s. The platform maintenance cycle is every six months or after three projects. The testing and maintenance content includes, but is not limited to, bolt tightening, expansion joint testing, control terminal testing, and whether the signal feedback of each module is normal.

[0078] S1: Install small sections: The small sections can be pre-installed in the factory, or they can be connected into small sections by flanges and bolts at the vertical shaft opening 11 on the roof or other open locations as needed, and then placed into the platform frame 2 of the hoisting platform 12.

[0079] S2: By adjusting the extension length of the telescopic screw 10 on the inner wall of the platform frame 2, it is made to fit tightly against the outer wall of the ordinary air duct section 1 on the small section inside the platform frame 2, so that the small section will not shake inside the platform frame 2.

[0080] S3: Two sets of synchronous electric winches symmetrically arranged on the roof opening 11 are connected to the lifting base 3 and the lifting base 8 on the hoisting platform 12 via steel wire ropes. Specifically, one set of electric winches is connected to the lifting base 3 and the lifting base 8 on the same side as the lifting base 3 and the lifting base 8, and the other set of symmetrical electric winches is connected to the lifting base 3 and the lifting base 8 on the same side as the previous set of symmetrical electric winches. The steel wire ropes are lowered synchronously through the synchronous electric winches to put the platform frame 2, which is clamped on the lifting base 3 and the lifting base 8, into the riser shaft 13.

[0081] S4: Before the platform frame 2 descends into the riser well 13, the telescopic screw 14 on the back side of the lower lifting base 8 of the platform frame 2 is pre-adjusted so that the guide roller 9 connected to the telescopic screw 14 on the back side of the lifting base 8 is in close contact with the well wall of the riser well, thereby assisting the platform frame 2 to descend smoothly into the riser well 13; at the same time, the telescopic screw 14 on the left and right sides of the lower lifting base 8 of the platform frame 2 is adjusted so that the total width of the guide roller 9 connected to the telescopic screw 14 on the left and right sides of the lifting base 8 is kept 1cm away from the width of the riser well 13, which can avoid blockage caused by foreign objects in the riser well 13;

[0082] At this time, the weight sensing device on platform frame 2 can convert the tension signal of the wire rope attached to the hoisting mechanism during the hoisting of platform frame 2 into an electrical signal and send it to the controller. Under normal circumstances, the tension of the wire rope sensed by the weight sensing device is directly proportional to the length of the wire rope retracted by the hoisting mechanism. Once the wire rope hits the support frame or is obstructed due to changes in the shaft structure size during hoisting, the tension signal sensed by the weight sensing device will continuously decrease under the drive of the hoisting mechanism, while the wire rope retraction length signal remains unchanged. When it exceeds a certain proportional range, the controller sends a command to control the gravity limit switch to cut off the power supply of the hoisting mechanism, suspend the hoisting operation, and resume the hoisting operation after the obstacle is removed. This avoids the wire rope from breaking or damaging the supports and floor slabs inside the shaft during hoisting, and further ensures the safety of the hoisting system during vertical hoisting.

[0083] S5: Workers can assemble ordinary duct section 1 in the open area on the roof, and at the same time, choose a reasonable flange bolt fixing plane according to their own conditions. The length of the assembly is determined according to actual needs. The ordinary duct section 1 to be stacked or the small whole section that has been assembled is suspended by two sets of synchronously controlled lifting mechanisms on the gantry crane 5. After flanges are put on the small whole section at the top of the platform frame 2, they are connected by bolts.

[0084] S6: Then, by installing and lowering the platform frame 2, several small sections or several ordinary duct sections 1 are gradually spliced ​​and installed with the topmost small section to form a large section. Then, the platform frame 2, which is clamped at the bottom of the large section (the initially clamped small section has become the bottom of the large section, and will be described as the "bottom of the large section" below), is hoisted down into the riser shaft 13 through the synchronous electric winch mechanism of the roof opening 11.

[0085] S7: When the platform frame 2 needs to be temporarily docked in the riser shaft 13 with three walls, the hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended through the hydraulic lifting mechanism; then the extension length of the telescopic screws 14 on the left and right sides of the lifting base 8 is adjusted so that the Y-shaped support frame 4 connected to the telescopic screws 14 on the left and right sides of the lifting base 8 contacts the inner wall of the section of the riser shaft 13, thereby opening the Y-shaped fork of the Y-shaped support frame 4, and the rubber pad on the Y-shaped fork contacts the inner wall of the section of the riser shaft 13 to achieve anti-slip, so that the platform frame 2 can be temporarily docked in the riser shaft 13 through the multiple Y-shaped support frames 4 opened on the left and right sides of the lifting base 8;

[0086] Meanwhile, in another working condition in S7, when the platform frame 2 needs to be temporarily parked in the riser shaft 13 with a wall on the back and open on the other three sides, the hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screw 14 on the four sides of the lifting base 8 is adjusted so that the length of the telescopic screw 14 can be supported on the edge floor slab of the floor opening of the riser shaft 13 or on the bottom surface of the riser shaft 13, thereby playing a more stable role.

[0087] S8: Two sets of symmetrically arranged synchronous electric winch mechanisms use steel wire ropes to gradually lower the platform frame 2, which is clamped at the bottom of the large section, to the position to be installed inside the riser well 13.

[0088] S9: The hoisting platform 12 extends, that is, the distance between the hoisting base 3 and the lifting base 8 is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screw 14 on the four sides of the lifting base 8 is adjusted, and the length of the telescopic screw 14 on the lifting base 8 reaches the ground of the section of the riser well 13 or is erected and supported on the opening of the section of the riser well 13 by means of S7, so that the platform frame 2 clamping the bottom of the whole section forms a stable stop in the section of the riser well 13.

[0089] It should be noted that the distance between the ground of the riser 13 section and the platform frame 2 that holds the bottom of the large section must be greater than the overall height of the hoisting platform 12 after compression by the hydraulic lifting mechanism + 0.5 meters, so as to provide conditions for the removal of the hoisting platform 12.

[0090] S10: Fix the exposed section of the entire segment inside the riser well 13;

[0091] S11: Then remove the hoisting platform 12. Specifically, the telescopic screw 10 inside the platform frame 2 rotates inward to loosen the large section bottom it is clamping. Control the hydraulic lifting mechanism to retract so that the hoisting base 3 connected to the platform frame 2 gradually approaches the lifting base 8, thereby reducing the overall height of the hoisting platform 12. This process requires controlling the hydraulic speed to be no more than 0.2m / s. At this time, the large section bottom that was clamped inside the platform frame 2 is exposed. Then, the exposed large section bottom is fixed inside the riser well 13.

[0092] Since the distance between the ground of the riser shaft 13 and the platform frame 2 that holds the bottom of the large section is greater than the overall height of the hoisting platform 12 after compression + 0.5 meters, the entire compressed hoisting platform 12 can be removed from below the large section after the large section inside the riser shaft 13 is fixed.

[0093] The traditional method involves installing supports and hangers in the manhole first, followed by the installation of the duct section. In order to save time, the lower supports are installed simultaneously with the duct hoisting. At the same time, there may be flange tightening work teams. All these operations are carried out inside the manhole, resulting in a large number of workers being distributed within the manhole. The workload of workers in the riser manhole is heavy, the construction time is long, and the worker efficiency is low. At the same time, the manhole is deep, and the lack of fixed points for safety ropes leads to frequent safety accidents.

[0094] This invention utilizes a platform hoisting method, avoiding the problem of duct deformation or detachment during hoisting caused by directly binding the stress point to the duct flange in traditional hoisting methods, which are often due to the thin flange wall and the weight of the pipe section or assembly. At the same time, the deformation and damage that may occur when the duct wall collides with the shaft wall can also be eliminated.

[0095] This invention enables temporary docking within the riser shaft by incorporating a telescopic screw and a Y-shaped support frame at its end, facilitating temporary operations and making it more suitable for on-site construction. Furthermore, the installation of a gantry crane above the riser shaft saves labor and simplifies construction operations. Simultaneously, the connection point is transformed from the traditional shaft interior to a rooftop platform, providing a safe and open area for operation, ensuring bolt tightening is not limited by space constraints.

[0096] Meanwhile, the present invention can raise and lower the hoisting platform through the lifting mechanism, thereby facilitating the removal and turnover of the hoisting platform after the air duct is installed, increasing the utilization rate and saving construction time.

[0097] Furthermore, the hoisting platform 12 of the present invention is also equipped with a horizontal detection (not exceeding 10°), a speed detection (not exceeding 1m / min), and a speed limit overload (not exceeding 2t) module, which are all connected to the control terminal through signals to realize emergency stopping.

[0098] In addition, when it is necessary to transport multiple parallel ordinary duct sections 1 connected to a pipe group, the platform frame used is similar to that of the present invention. The width of the platform frame is adjusted according to the width of the pipe group, and the transportation method is the same. The structure and transportation method of the present invention can be referred to.

[0099] This invention only uses the roof opening as an example, but the platform can also be used in other open areas in the shaft; this invention only uses the bolt connection of the angle steel flange as an example, but the connection method can also include various forms of welding, thin steel plate flange, strip connection, etc.; this invention only uses metal air ducts as an example, but it is also applicable to non-metallic air ducts or composite air ducts.

[0100] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0101] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0102] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hoisting system for ductwork in a vertical shaft, suitable for installing ductwork in a riser shaft (13), comprising a hoisting platform (12), said hoisting platform (12) comprising a rectangular hoisting base (3), characterized in that, The bottom of the hoisting base (3) is connected to a rectangular lifting base (8) through a lifting mechanism. The center of the top of the hoisting base (3) is provided with a rectangular platform frame (2). Several sections of ordinary air duct segments (1) are placed inside the platform frame (2). Several sets of telescopic screws (10) are evenly provided on the inner walls of the platform frame (2). The telescopic screws (10) support and closely abut against the outer wall of the small section inside the platform frame (2). Several sets of hooks (6) are evenly provided on the hoisting base (3) and several sets of hooks (7) are fixed on the bottom of the lifting base (8). The platform frame (2) is connected to the synchronous electric winch mechanism through hooks (6), hooks (7) and wire ropes. Y-shaped support frame (4) is provided on the telescopic screw rods (14) corresponding to the left and right sides of the lifting base (8). The Y-shaped support frame (4) abuts against the wall of the riser well (13) with three walls through the telescopic screw rods (14), so that the suspended lifting base (8) is temporarily supported, thereby temporarily stopping the suspended hoisting platform (12) in the riser well (13). Guide rollers (9) are provided on the telescopic screws (14) on the left and right sides and the back side of the lifting base (8). The guide rollers (9) are arranged alternately in parallel with the Y-shaped support frame (4). The guide rollers (9) are used to assist the platform frame (2) in descending in the riser well (13), improve the stability of the hoisting platform (12), and avoid the hoisting platform (12) from directly colliding with the well wall of the riser well (13). A gantry crane (5) is provided above the riser shaft (13). The two sides of the gantry crane (5) are installed on the vertical shaft opening (11) on the roof surface through support frames. The gantry crane (5) is equipped with two sets of synchronously controlled lifting devices. The lifting devices are located directly above the riser shaft (13). The ordinary air duct section (1) to be installed is connected to the small whole section in the platform frame (2) one by one through the lifting devices. The platform frame (2) is gradually stacked and spliced ​​in the platform frame (2) to form a large whole section by stacking and splicing at the same time.

2. The hoisting system for air ducts inside a vertical shaft according to claim 1, characterized in that, The rectangular lifting base (8) is provided with at least three sets of telescopic screw rods (14) on all four sides. The telescopic screw rods (14) are used to temporarily erect the lifting base (8) in the riser shaft (13) above the opening of the floor where it stops.

3. The hoisting system for air ducts inside a vertical shaft according to claim 2, characterized in that, One end of the Y-shaped support frame (4) is connected to the telescopic screw (14), and the other end adopts a Y-shaped fork. A rubber pad is provided on the Y-shaped fork. After the Y-shaped fork is unfolded, the rubber pad contacts the inner wall of the riser well (13) to increase friction and achieve anti-slip effect.

4. The hoisting system for air ducts inside a vertical shaft according to claim 1, characterized in that, The lifting mechanism includes a hydraulic lifting mechanism, a cylinder lifting mechanism, or a screw lifting mechanism disposed between the lifting base (8) and the hoisting base (3).

5. The hoisting system for air ducts in a vertical shaft according to claim 1, characterized in that, The platform frame (2) is equipped with a weight sensing device, a gravity limiter, a levelness monitoring module, a running speed detection module, and a load-bearing sensing module. The weight sensing device can convert the tension signal of the wire rope attached to the hoisting mechanism during the hoisting of the platform frame (2) into an electrical signal and send it to the controller, further ensuring the safety of the hoisting system during vertical hoisting. The levelness monitoring module, the running speed detection module, and the load-bearing sensing module are all connected to the control terminal through a signal to realize emergency braking.

6. The hoisting system for air ducts inside a vertical shaft according to claim 5, characterized in that, The platform frame (2) is provided with a scale, which allows workers to observe the depth of the bottom of the large section being clamped in the platform frame (2) from the platform frame (2), thereby presetting the height at which the hoisting platform (12) can be compressed and removed in the section of the riser well (13).

7. An operation method for a hoisting system for vertical shaft ventilation ducts according to any one of claims 1-6, characterized in that, The steps are as follows: The bulk duct section is defined as a regular duct section (1), and the duct section is 0.5 to 1m. Multiple regular duct sections (1) are spliced ​​together to form a small whole section of 2 to 3m. Multiple small whole sections are connected to form a large whole section of 20 to 30m. The large whole section is the specification that the platform frame can be lowered into the riser shaft at one time. S0: The hoisting platform (12) needs to be tested before use. During the test, it is run at full load at the maximum speed limit and tested and maintained. The testing and maintenance includes bolt tightening, expansion joint testing, control end testing, and whether the signal feedback of each module is normal. S1: First, connect two to three sections of ordinary air duct (1) into a small whole section by flange and bolt on the vertical shaft opening (11) on the roof surface and then put it into the platform frame (2) of the hoisting platform (12); S2: By adjusting the extension length of the telescopic screw 1 (10) on the inner wall of the platform frame (2), it is made to fit tightly against the outer wall of the ordinary air duct section (1) on the small section inside the platform frame (2), so that the small section will not shake inside the platform frame (2); S3: Connect the two sets of synchronous electric winches symmetrically arranged on the vertical shaft opening (11) on the roof to the hoisting base (3) and lifting base (8) on the hoisting platform (12) and the lifting base (8) respectively with wire ropes. Then, control the wire ropes to lower the platform frame (2) located on the hoisting base (3) and lifting base (8) into the riser shaft (13) through the synchronous electric winch mechanism. S4: Before the platform frame (2) descends into the riser well (13), the telescopic screw two (14) on the back side of the lifting base (8) of the platform frame (2) is adjusted in advance so that the guide roller (9) connected to the telescopic screw two (14) on the back side of the lifting base (8) is in close contact with the well wall of the riser well, so as to achieve the purpose of assisting the platform frame (2) to descend smoothly into the riser well (13); at the same time, the telescopic screw two (14) on the left and right sides of the lifting base (8) of the platform frame (2) is adjusted so that the total width of the guide roller (9) connected to the telescopic screw two (14) on the left and right sides of the lifting base (8) is kept 1cm away from the width of the riser well (13), so as to avoid blockage caused by foreign objects in the riser well (13); S5: Workers can choose a reasonable flange bolt fixing plane to assemble ordinary air duct section (1) in the open area on the roof and, based on their own conditions, suspend the ordinary air duct section (1) to be stacked or the small whole section that has been assembled through two sets of synchronously controlled lifting mechanisms on the gantry crane (5), and then connect it with the small whole section on the top layer of the platform frame (2) by bolts after flanges are put on them respectively. S6: Then, by installing and lowering at the same time, several small sections or several ordinary air duct sections (1) are gradually spliced ​​and installed with the topmost small section on the platform frame (2) to form a large section. Then, the platform frame (2) holding the bottom of the large section is hoisted down to the riser shaft (13) through the synchronous electric winch mechanism of the vertical shaft opening (11) on the roof. S7: When the platform frame (2) needs to be temporarily docked in the riser well (13) with three walls, the hoisting platform (12) extends, that is, the distance between the hoisting base (3) and the lifting base (8) is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screws (14) on the left and right sides of the lifting base (8) is adjusted so that the Y-shaped support frame (4) connected by the telescopic screws (14) on the left and right sides of the lifting base (8) contacts the inner wall of the riser well (13) and opens the Y-shaped fork of the Y-shaped support frame (4), and the rubber pad on the Y-shaped fork contacts the inner wall of the riser well (13) to achieve anti-slip, so that the platform frame (2) can be temporarily docked in the riser well (13) by multiple Y-shaped support frames (4) opened on the left and right sides of the lifting base (8); Meanwhile, in another working condition in S7, when the platform frame (2) needs to be temporarily parked in the riser shaft (13) with a wall on the back and open on the other three sides, the hoisting platform (12) extends, that is, the distance between the hoisting base (3) and the lifting base (8) is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screws (14) on the four sides of the lifting base (8) is adjusted so that the length of the telescopic screws (14) can be erected on the edge floor slab of the floor opening of the riser shaft (13) or the bottom surface of the riser shaft (13), thereby playing a more stable role; S8: Two sets of symmetrically arranged synchronous electric winches use steel wire ropes to gradually lower the platform frame (2) holding the bottom of the large section to the position to be installed in the riser well (13); S9: The hoisting platform (12) extends, that is, the distance between the hoisting base (3) and the lifting base (8) is extended by the hydraulic lifting mechanism; then the extension length of the telescopic screws (14) on the four sides of the lifting base (8) is adjusted, and the length of the telescopic screws (14) on the lifting base (8) reaches the ground of the section of the riser (13) or is erected and supported on the opening of the section of the riser (13) by means of S7, so that the platform frame (2) clamping the bottom of the whole section forms a stable stop in the section of the riser (13); The distance between the ground of the riser shaft (13) and the platform frame (2) that holds the bottom of the large section needs to be greater than the overall height of the hoisting platform (12) after compression by the hydraulic lifting mechanism + 0.5 meters, so as to provide conditions for the removal of the hoisting platform (12); S10: Fix the exposed section of the whole section inside the riser well (13); S11: Then remove the hoisting platform (12), specifically by rotating the telescopic screw (10) inside the platform frame (2) inward to loosen the bottom of the large section it is clamping, and controlling the hydraulic lifting mechanism to retract so that the hoisting base (3) connected to the platform frame (2) gradually approaches the lifting base (8), thereby reducing the overall height of the hoisting platform (12). This process requires controlling the hydraulic speed to be no greater than 0.2m / s; at this time, the bottom of the large section clamped inside the platform frame (2) is exposed, and then the exposed bottom of the large section is fixed inside the riser well (13); Since the distance between the ground of the riser (13) and the platform frame (2) that holds the bottom of the large section is greater than the overall height of the hoisting platform (12) after compression + 0.5 meters, the entire compressed hoisting platform (12) can be removed from below the large section after the large section inside the riser (13) is fixed.

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