Steel formwork hydraulic jacking construction method of heat absorption tower concrete structure

Abstract

The steel formwork hydraulic jacking construction method of the heat absorption tower concrete structure comprises the following steps that the first section of tower wall of a heat absorption tower is constructed, a plurality of steel cylinders are inserted into the first section of tower wall of the heat absorption tower in the circumferential direction, and concrete is poured to embed the steel cylinders; scaffolds are erected inside and outside the heat absorption tower respectively; a center drum is assembled in a heat absorption tower, a plurality of steel channels are installed on the top of the first section of tower wall of the heat absorption tower, the center drum is fixed through the steel channels, steel rings are jointly installed at the bottoms of all the steel channels, one jack is fixed to the top of each steel channel, and each jack is correspondingly fixed to one steel cylinder; a stay cable is installed between the channel steel and the central drum, and a hanging bracket is installed on the channel steel; wood formworks are fully laid on the tops of the steel channels, and derrick masts are arranged on the wood formworks; a hydraulic system is installed on the wood formwork; jacking the first section of tower wall of the heat absorption tower, continuously connecting the steel cylinder to the top of the steel cylinder after jacking, and circulating the operation until all jacking work is completed; in the jacking process, the load is greatly reduced, and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction methods and relates to a hydraulic jacking construction method for a steel formwork of a heat absorption tower concrete structure. Background Art

[0002] Slipform and flip form technology is usually used in the jacking construction of concrete structures for thin-walled and tall buildings such as heat absorption towers. However, the slipform construction process has problems such as low safety factor, difficult to ensure construction quality, high resource investment and high construction cost. The traditional flip form technology will cause the following problems: high safety risk, high technical difficulty and high quality standards. All major processes must be carried out in sequence, and parallel or misaligned positions are not allowed. There is an unchangeable rigid construction key line. The reinforcement around the heat absorption tower opening is dense, and the difficulty of steel bar binding and concrete pouring is quite large. The quality of concrete construction is difficult to effectively guarantee, the construction period is tight, the construction of the heat absorption tower directly affects the construction of surrounding buildings, and three-dimensional cross operations are difficult. Therefore, it is imperative to develop a new jacking construction method for the concrete structure of the heat absorption tower. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic jacking construction method for a steel formwork of a heat absorption tower concrete structure, which solves the problems in the prior art of low safety factor and difficulty in ensuring construction quality in the jacking construction of the concrete structure of thin-walled and tall buildings such as heat absorption towers.

[0004] The technical solution adopted by the present invention is a method for hydraulically lifting the steel formwork of a heat absorption tower concrete structure, comprising the following steps: Step 1: construct the first section of the heat absorption tower wall, insert a number of steel cylinders in the first section of the heat absorption tower wall along the circumferential direction, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorbing tower, install several channel steels on the top of the first tower wall of the heat absorbing tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0005] The present invention is also characterized in that: Step 1 is carried out as follows: Step 1.1, tying vertical steel bars and circumferential steel bars at the first section of the pre-constructed heat absorption tower wall to form a steel mesh; Step 1.2, installing a layer of steel formwork in the circumferential direction inside and outside the steel mesh respectively to form the first section of the tower wall of the heat absorption tower; Step 1.3, insert several steel cylinders evenly along the circumferential direction at the center line of the first section of the heat absorption tower. The length of the steel cylinder is a multiple of the height of the steel template. The steel cylinder is welded to the circumferential steel bar, and the steel bar is used to obliquely reinforce the steel cylinder in the form of an eight-shaped angle, with one reinforcement at the top and bottom of the steel cylinder; Step 1.4, pour concrete into the first section of the heat absorption tower wall to bury the steel cylinder.

[0006] In step 2, two rows of scaffolding are radially arranged inside and outside the first section of the tower wall of the heat absorption tower. The radial spacing between adjacent vertical poles on the scaffolding is 0.8m-1.2m, the lateral spacing is 1.3m-1.5m, and the longitudinal spacing is 1.2m-1.4m. Wooden boards with a thickness of 35mm-45mm are laid at the bottom of the scaffolding. The distance between the scaffolding and the tower wall of the heat absorption tower is not more than 20mm, and the height ratio of the scaffolding inside the tower and the scaffolding outside the tower is 3:1.

[0007] Step 3 is specifically performed as follows: Step 3.1, arrange a full-chamber support frame at the center of the inner side of the heat absorption tower, the length and width of the full-chamber support frame are both 6m and the height is 0.2m; Step 3.2, use a truck crane to sequentially hoist the three steel rings onto the inner scaffolding, connect the three steel rings sequentially in pairs through a number of vertical rods and a number of diagonal braces to form a central drum, and place the central drum on the full-height support frame. The ratio of the diameter to the height of the central drum is 1:0.9-1.1, and the preset arch height of the central drum is 40mm; Step 3.3, hinge one end of several channel steels to the outside of the top steel ring along the circumference of the central drum. The number of channel steels is the same as the number of steel drums. The length of the channel steels is not less than 12m. The extension lines of all channel steels pass through the center point of the heat absorption tower. The spacing between adjacent channel steels is 70mm-90mm. A fire basin is hung at the other end of the channel steel. The part of the end of the channel steel that exceeds 3m of the tower wall is cut off by gas cutting. The channel steel is cut symmetrically; Step 3.4, fix four steel rings with radii of 5.6m-6.2m, 7.2m-7.6m, 8.5m-9.2m, and 10m-10.8m to the bottom of all channel steels in sequence, each steel ring is symmetrical about the central drum, and lay scaffolding boards in the grooves of the channel steels; Step 3.5, fix two steel pipes with a length of 2.5m-3.5m on the top of the central drum, the two steel pipes are set relative to each other, a camera is placed on the top of one of the steel pipes, and a wind speed detector is placed on the top of the other steel pipe; Step 3.6, a jack is mounted on each steel cylinder, the support of each jack is fixed to the top of a channel steel, and the jack is fixedly connected to the support by bolts.

[0008] Step 4 is carried out as follows: Step 4.1, fix one end of four inclined cables at the position where the channel steel is located on the inner side of the first section of the tower wall of the heat absorption tower, and the four inclined cables are fixed in sequence from the outside to the inside, wherein the other ends of three inclined cables are fixed to the outside of the bottom steel ring through basket bolts, and the other end of another inclined cable is fixed to the outside of the center steel ring through basket bolts; Step 4.2, weld two steel bars at the ends of the channel to form a latch, and insert a railing with a height of not less than 1.2m into the latch; Step 4.3, fix a hanger by bolts at the bottom of the channel steel on both sides of the inside and outside of the first section of the tower wall of the heat absorption tower. The gap between the hanger and the tower wall is no more than 200mm. Fix the scaffolding board on the outside of the hanger by wire binding. The bottom of the hanger and the bottom of the scaffolding are completely wrapped by safety nets inside and outside the tower wall. Tighten the safety net on the inside of the hanger with a steel wire rope.

[0009] Step 5 is specifically performed as follows: Step 5.1: Lay wooden formwork on the top of the channel steel to form a platform surface; Step 5.2, lift the gantry and winch onto the platform surface by using a truck crane; Step 5.3, fix the pick rod on the platform surface and at a position outside the heat absorption tower. The pick rod is located between two channel steels and 40cm-60cm away from the tower wall of the heat absorption tower; Step 5.4, fix the winch on the platform surface and at the inner side of the heat absorption tower through the angle iron, and connect the winch and the lifting rod through the wire rope.

[0010] The hydraulic system includes a hydraulic control console, which is provided with a distribution box, a leakage protector and an oil pressure gauge. A rain cover is provided on the top of the distribution box. An oil distributor is provided inside the hydraulic control console, and a needle valve is provided on the oil distributor. The hydraulic control console is connected to several main oil pipes, each of which is connected to several oil distribution pipes. The total number of oil distribution pipes is the same as the number of jacks. Each oil distribution pipe is connected to a corresponding jack. An oil pump is provided on the main oil pipe, and the rated pressure of the oil pump is not less than 12MPa.

[0011] Step 7 is specifically performed as follows: Step 7.1, testing the concrete strength of the first section of the tower wall of the heat absorption tower, removing the steel formwork inside and outside the first section of the tower wall of the heat absorption tower when the concrete strength is not less than 6Mpa, brushing the removed steel formwork with formwork isolation agent and then hoisting it to the top of the platform surface, repairing the tower wall surface after demoulding and applying curing liquid, and starting the jack when the concrete strength is not less than 20Mpa; Step 7.2, lift the first section of the tower wall of the heat absorption tower by using a jack. The lifting height of the jack is 25mm-35mm each time. After each lifting, take a 30s break before lifting again. When the total lifting length reaches 500mm, stop lifting and continue to tie steel bars to the top 500mm of the steel mesh. Step 7.3, looping step 7.2 and step 7.3 until the jacking height reaches the height of a steel template, installing steel templates circumferentially inside and outside the steel mesh to form the second section of the heat absorption tower wall, and pouring concrete on the second section of the heat absorption tower wall; Step 7.4, repeat steps 7.1, 7.2 and 7.3 until the lifting height reaches the length of the steel cylinder, insert another steel cylinder with a matching inner diameter into the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh; Step 7.5, looping steps 7.1, 7.2 and 7.3, when the lifting height reaches the length of the steel cylinder again, insert another steel cylinder with a matching outer diameter into the outer side of the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh respectively; Step 7.6, alternately perform step 7.4 and step 7.5 until the entire lifting work of the heat absorption tower is completed.

[0012] Before jacking up the first section of the tower wall of the heat absorption tower, a trial jacking and load test shall be carried out. The jacking work shall be carried out only after no abnormality is found in the trial jacking and the load test is passed.

[0013] When pouring concrete, concrete is transported by elevators, and when tying steel bars, steel bars are transported by levers.

[0014] The beneficial effects of the present invention are: The present invention adopts the use of steel formwork for hydraulic jacking during the construction process. Compared with the traditional wooden formwork, it is more economical, has a faster construction progress, is simple and quick to operate, occupies less material area, is beneficial to the construction of other work surfaces, is more environmentally friendly, and does not have various problems of post-processing of scrapped materials. At the same time, it can save the labor and materials required for supporting formwork and setting up scaffolding during the construction process, reduce costs, and has a large safety factor. The steel formwork can be used for turnover construction, and a flow construction is formed when it is used in turnover. The whole method saves human resource investment in operation, reduces the number of procedures, compresses the time of the overall operation, and saves construction period; the steel formwork forms an independent system, and there is no cracking phenomenon caused to the concrete due to the friction resistance in the sliding formwork method, and the intrinsic quality of the concrete is fully guaranteed; it provides internal The two outer rows of scaffolding allow formwork installation, formwork removal, cleaning, oiling, reinstallation, tower wall grinding and maintenance to be carried out on the inner and outer rows of scaffolding on the operating table; by carrying out the construction of the reinforced concrete structure of the heat absorption tower wall in the closed space provided by hydraulic jacking, it is convenient to carry out steel bar binding, steel formwork installation and removal, concrete pouring, and steel formwork turnover, which effectively guarantees the personal safety of all types of workers in high-altitude operations. All types of workers can carry out flow operations on the platform surface, which effectively guarantees the personal safety of ultra-high-altitude workers, and can implement cross-flow operations to improve labor organization, avoid peaks in work type allocation, and reduce the number of construction workers; during the jacking process, there is no friction between the steel formwork and the heat absorption tower wall, the load is greatly reduced, and the amount of steel can be saved by 30% compared with the sliding formwork method. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a layout diagram of the channel steel, steel ring and center drum in the present invention; Figure 2 It is a layout diagram of the hanger, platform surface and grab bar in the present invention; Figure 3 It is a layout diagram of the overall structure of the present invention.

[0015] In the figure, 1. center drum, 2. channel steel, 3. tower wall, 4. steel ring, 5. inclined cable, 6. platform surface, 7. hanger, 8. pull rod, 9. winch, 10. railing, 11. steel pipe, 12. camera, 13. wind speed detector, 14. wire rope, 15. steel cylinder, 16. jack, 17. steel formwork, 18. safety net, 19. hydraulic system. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: perform vertical and circumferential reinforcement binding at the first section of the heat absorption tower wall that has been pre-constructed to form a steel mesh, install a layer of steel formwork circumferentially inside and outside the steel mesh to form the first section of the heat absorption tower wall, insert several steel cylinders evenly circumferentially at the center line of the first section of the heat absorption tower wall, the length of the steel cylinder is a multiple of the height of the steel formwork, weld the steel cylinder to the circumferential reinforcement, use steel bars to obliquely reinforce the steel cylinder, the reinforcement form is an eight-shaped angle, reinforce the top and bottom of the steel cylinder, and pour concrete to bury the steel cylinder on the first section of the heat absorption tower wall; Step 2: Arrange two rows of scaffolding radially inside and outside the first section of the heat absorption tower. The radial spacing between adjacent vertical poles on the scaffolding is 0.8m-1.2m, the horizontal spacing is 1.3m-1.5m, and the vertical spacing is 1.2m-1.4m. The bottom of the scaffolding is laid with a 35mm-45mm thick wooden board. The distance between the scaffolding and the wall of the heat absorption tower is not more than 20mm. The height ratio of the scaffolding inside the tower and the scaffolding outside the tower is 3:1; Step 3: Arrange a full-chamber support frame at the center of the inner side of the heat absorption tower. The length and width of the full-chamber support frame are both 6m and the height is 0.2m. Use a car crane to lift the three steel rings onto the inner scaffolding in turn. Use a number of vertical rods and a number of diagonal braces to connect the three steel rings in pairs to form a central drum. Place the central drum on the full-chamber support frame. The diameter and height ratio of the central drum is 1:0.9-1.1, and the preset arch height of the central drum is 40mm. Hinged one end of a number of channel steels to the outside of the top steel ring along the circumference of the central drum. The number of channel steels is the same as the number of steel cylinders, and the length of the channel steel is not less than 12m. The extension lines of all channel steels pass through the center point of the heat absorption tower. The spacing between adjacent channel steels is 70mm-90mm. A fire basin is hung at the other end of the channel steel. The part of the channel steel end that exceeds the tower wall by 3m is cut off by gas cutting. When cutting the channel steel, follow the symmetrical cutting method. The process is carried out in a discontinuous manner; four steel rings with radii of 5.6m-6.2m, 7.2m-7.6m, 8.5m-9.2m, and 10m-10.8m are fixed to the bottom of all channel steels in sequence, and each steel ring is symmetrical about the central drum, and scaffolding boards are laid in the grooves of the channel steels; two steel pipes with a length of 2.5m-3.5m are fixed to the top of the central drum, and the two steel pipes are arranged in opposite positions, a camera is placed on the top of one of the steel pipes, and a wind speed detector is placed on the top of the other steel pipe; a jack is set on each steel cylinder, and the support of each jack is fixed to the top of a channel steel, and the jack is fixedly connected to the support by bolts. When installing the jack, the inclination of the jack base should be consistent with the slope of the tower wall to meet the requirements of the convergence slope. The axis of the steel cylinder should be consistent with the axis of the jack, and the overall deflection allowable deviation is 2‰; Step 4: Fix one end of four inclined cables at the position where the channel steel is located on the inner side of the first section of the tower wall of the heat absorption tower. The four inclined cables are fixed in sequence from the outside to the inside. The other ends of three inclined cables are fixed to the outside of the bottom steel ring by basket bolts, and the other end of another inclined cable is fixed to the outside of the center steel ring by basket bolts. The inclined cables are made of Φ18 round steel, and the lengths of the four inclined cables are 3.92m, 7.06m, 8.59m, and 10.29m respectively; weld two steel bars at the adjacent ends of the channel steel in the groove to form a pin, insert a railing with a height of not less than 1.2m into the pin, and fix a hanger by bolts at the bottom of the channel steel on both sides of the inner and outer sides of the first section of the tower wall of the heat absorption tower. The gap between the hanger and the tower wall is not more than 200mm. The scaffolding board is fixed on the outside of the hanger by wire binding. The bottom of the hanger and the bottom of the scaffolding are completely wrapped by safety nets inside and outside the tower wall, and the safety net is tightened by steel wire ropes on the inside of the hanger; Step 5: Fully spread the wooden formwork on the top of the channel steel to form a platform surface, lift the raft and winch to the platform surface by a car crane, fix the raft on the platform surface and at a position outside the heat absorption tower. The raft is located between two channel steels and 40cm-60cm away from the tower wall of the heat absorption tower. Fix the winch on the platform surface and at a position inside the heat absorption tower through angle irons, connect the winch and raft with steel wire ropes, and transport the cut channel steel to the ground by the raft or elevator; Step 6: Install the hydraulic system on the wooden formwork. The hydraulic system includes a hydraulic control console. The hydraulic control console is provided with a distribution box, a leakage protector and an oil pressure gauge. A rain cover is provided on the top of the distribution box. An oil distributor is provided inside the hydraulic control console. A needle valve is provided on the oil distributor. The hydraulic control console is connected to several main oil pipes, each of which is connected to several oil distribution pipes. The total number of oil distribution pipes is the same as the number of jacks. Each oil distribution pipe is connected to a corresponding jack. An oil pump is provided on the main oil pipe. The rated pressure of the oil pump is not less than 12MPa. Step 7 is specifically performed as follows: Step 7.1, testing the concrete strength of the first section of the tower wall of the heat absorption tower, removing the steel formwork inside and outside the first section of the tower wall of the heat absorption tower when the concrete strength is not less than 6Mpa, brushing the removed steel formwork with formwork isolation agent and then hoisting it to the top of the platform surface, repairing the tower wall surface after demoulding and applying curing liquid, and starting the jack when the concrete strength is not less than 20Mpa; Step 7.2, lift the first section of the tower wall of the heat absorption tower by using a jack. The lifting height of the jack is 25mm-35mm each time. After each lifting, take a 30s break before lifting again. When the total lifting length reaches 500mm, stop lifting and continue to tie steel bars to the top 500mm of the steel mesh. When tying steel bars, use a pick rod to transport the steel bars. Step 7.3, looping step 7.2 and step 7.3 until the jacking height reaches the height of a steel template, installing steel templates in the circumferential direction inside and outside the steel mesh respectively to form the second section of the heat absorption tower wall, pouring concrete on the second section of the heat absorption tower wall, and transporting the concrete by a lift during the pouring of concrete; Step 7.4, repeat steps 7.1, 7.2 and 7.3 until the lifting height reaches the length of the steel cylinder, insert another steel cylinder with a matching inner diameter into the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh; Step 7.5, looping steps 7.1, 7.2 and 7.3, when the lifting height reaches the length of the steel cylinder again, insert another steel cylinder with a matching outer diameter into the outer side of the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh respectively; Step 7.6, alternately perform step 7.4 and step 7.5 until the entire lifting work of the heat absorption tower is completed.

[0018] The jack adopts a through-type hydraulic jack, which has a self-locking function in both the lifting and non-lifting states, so that the jack and the channel steel can only be lifted upwards and cannot fall down. Every time the hydraulic console pressurizes and returns oil, the through-type jack climbs up 25mm-35mm along the steel cylinder buried in the wall of the heat absorption tower, and drives the channel steel to lift up 25mm-35mm; when pouring concrete, it is necessary to pour it continuously at one time without leaving construction joints; the camera is used to monitor the construction status of each part, and the wind speed detector is used to monitor the wind speed and wind direction. When the wind speed is greater than level 6, the steel bar lifting is stopped, the construction is suspended and the personnel are evacuated quickly; When lifting, a restricted area of ​​30m needs to be set up around the heat absorption tower. The radius of the heat absorption tower wall will become smaller after the tower wall is raised, and the outermost inclined cable needs to be removed accordingly. The railing should be moved inward as the platform surface gradually shrinks. The connection between the railing and the channel steel is a pin-type connection. When moving the railing, first re-weld the steel bars at the position where the railing needs to be inserted, then remove the steel bars of the original railing, move the railing out, and insert it into the newly set pin; after the hydraulic system is installed, the jack exhaust and hydraulic system oil pressure, no-load, and pressure maintenance tests must be completed, and records must be made. After the test is qualified, debugging must be carried out to ensure that the heights of all jacks are consistent.

[0019] When installing the steel cylinder for the first time, at least four lengths of rods must be used, and they must be placed in sequence so that the joints of the rods are staggered. In the same plane, the vertical spacing of the joints of adjacent steel cylinders is greater than 1m, and the number of joints of the steel cylinders is no more than 25% of the total, and their positions are evenly arranged; when constructing the heat absorption tower wall, the center of the heat absorption tower and the axis control point are measured and set, the center of the heat absorption tower is measured to the foundation of the construction elevator, and a T3030 embedded part is placed at the center of the heat absorption tower, and the axis control point is measured to the top of the tower wall. When constructing the heat absorption tower wall, laser centering is used for center control. A laser plumb line is installed at the center of the heat absorption tower, and a laser receiving target is set at the center of the construction platform to receive laser signals to determine the center position. Since there is a certain error in the installation of the laser plumb line, the error will increase as the tower wall rises. In order to reduce the error, a multi-point centering method is adopted during the construction process, that is, the laser plumb line is gradually rotated and marked on the receiving target, so that multiple points will be marked on the receiving target, these points are connected into a circle, and then the center of the circle is marked.

[0020] After the jacking construction is completed, the scaffolding needs to be dismantled and the diagonal rods need to be readjusted in sequence so that all the diagonal cables are evenly stressed. Before the scaffolding is completely dismantled, a layer of safety net should be placed at the bottom of the center drum and the channel steel.

[0021] This construction method is suitable for the construction of reinforced concrete structures of the outer wall panels of tall, thin-walled structures with small footprint and uniform and symmetrical structural wall panels, such as chimneys and heat-absorbing towers. The conventional wooden formwork jacking construction can complete the concrete pouring of one layer of tower wall in one day, and the steel formwork jacking construction can complete the concrete pouring of three layers of tower wall in two days.

[0022] Embodiment 1: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: Perform vertical and circumferential reinforcement binding at the first section of the heat absorption tower wall that has been pre-constructed to form a steel mesh. Install a layer of steel formwork circumferentially inside and outside the steel mesh to form the first section of the heat absorption tower wall. Evenly insert 32 steel cylinders circumferentially at the center line of the first section of the heat absorption tower wall. The length of the steel cylinder is a multiple of the height of the steel formwork. The steel cylinder is welded to the circumferential reinforcement. The steel cylinder is obliquely reinforced with steel bars in the form of an eight-shaped angle. The top and bottom of the steel cylinder are reinforced once each. Concrete is poured into the first section of the heat absorption tower wall to bury the steel cylinder. Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorption tower, install 32 channel steels on the top of the first tower wall of the heat absorption tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a corresponding steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0023] Embodiment 2: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: construct the first section of the heat absorption tower wall, insert 32 steel cylinders in the circumferential direction of the first section of the heat absorption tower wall, and pour concrete to bury the steel cylinders; Step 2: Arrange two rows of scaffolding radially inside and outside the first section of the heat absorption tower. The radial spacing between adjacent vertical poles on the scaffolding is 1m, the horizontal spacing is 1.4m, and the vertical spacing is 1.3m. The bottom of the scaffolding is laid with a 40mm thick wooden board. The distance between the scaffolding and the wall of the heat absorption tower is 20mm. The height ratio of the scaffolding inside the tower and the scaffolding outside the tower is 3:1. Step 3: Assemble the central drum in the heat absorption tower, install 32 channel steels on the top of the first tower wall of the heat absorption tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a corresponding steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0024] Embodiment 3: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: construct the first section of the heat absorption tower wall, insert 32 steel cylinders in the circumferential direction of the first section of the heat absorption tower wall, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Arrange a full-chamber support frame at the center of the inner side of the heat absorption tower. The length and width of the full-chamber support frame are both 6m and the height is 0.2m. Use a car crane to lift the three steel rings onto the inner scaffolding in turn. Use a number of vertical rods and a number of diagonal braces to connect the three steel rings in pairs to form a central drum. Place the central drum on the full-chamber support frame. The diameter and height ratio of the central drum is 1:1. The preset arch height of the central drum is 40mm. Hinged one end of 32 channel steels along the circumference of the central drum to the outside of the top steel ring. The length of the channel steel is 12m. The extension lines of all channel steels pass through the center point of the heat absorption tower. The spacing between adjacent channel steels is 80mm. A fire connection is hung at the other end of the channel steel. Basin, cut off the part of the channel steel end that exceeds 3m of the tower wall by gas cutting, and cut the channel steel symmetrically; fix four steel rings with radii of 5.9m, 7.4m, 8.9m and 10.4m at the bottom of all channel steels in turn, and each steel ring is symmetrical about the central drum, and lay scaffolding boards in the grooves of the channel steel; fix two 3m steel pipes on the top of the central drum, and the two steel pipes are set oppositely. A camera is placed on the top of one of the steel pipes, and a wind speed detector is placed on the top of the other steel pipe; a jack is set on each steel cylinder, and the support of each jack is fixed to the top of a channel steel respectively, and the jack is fixed to the support by bolts; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0025] Embodiment 4: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: construct the first section of the heat absorption tower wall, insert 32 steel cylinders in the circumferential direction of the first section of the heat absorption tower wall, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorption tower, install 32 channel steels on the top of the first tower wall of the heat absorption tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a corresponding steel drum; Step 4: Fix one end of four inclined cables at the position where the channel steel is located on the inner side of the first section of the tower wall of the heat absorption tower. The four inclined cables are fixed in sequence from the outside to the inside. The other ends of three inclined cables are fixed to the outside of the bottom steel ring by means of basket bolts, and the other end of another inclined cable is fixed to the outside of the center steel ring by means of basket bolts. Weld two steel bars at the adjacent ends of the channel steel to form a latch, insert a railing with a height of 1.2m into the latch, and fix a hanger by bolts at the bottom of the channel steel on both sides of the inner and outer sides of the first section of the tower wall of the heat absorption tower. The gap between the hanger and the tower wall is 200mm. Fix the scaffolding board by wire binding on the outside of the hanger. The bottom of the hanger and the bottom of the scaffolding are completely wrapped by safety nets inside and outside the tower wall, and tighten the safety net by steel wire ropes on the inside of the hanger; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0026] Embodiment 5: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: construct the first section of the heat absorption tower wall, insert 32 steel cylinders in the circumferential direction of the first section of the heat absorption tower wall, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorption tower, install 32 channel steels on the top of the first tower wall of the heat absorption tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a corresponding steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Fully spread the wooden formwork on the top of the channel steel to form a platform surface, lift the raft and winch to the platform surface by a car crane, fix the raft on the platform surface and at a position outside the heat absorption tower. The raft is located between two channel steels and 50 cm away from the tower wall of the heat absorption tower. Fix the winch on the platform surface and at a position inside the heat absorption tower through angle irons, connect the winch and raft with steel wire ropes, and transport the cut channel steel to the ground by the raft or elevator; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

[0027] Embodiment 6: The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure comprises the following steps: Step 1: construct the first section of the heat absorption tower wall, insert 32 steel cylinders in the circumferential direction of the first section of the heat absorption tower wall, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorption tower, install 32 channel steels on the top of the first tower wall of the heat absorption tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a corresponding steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork. The hydraulic system includes a hydraulic control console. The hydraulic control console is provided with a distribution box, a leakage protector and an oil pressure gauge. A rain cover is provided on the top of the distribution box. An oil distributor is provided inside the hydraulic control console. A needle valve is provided on the oil distributor. The hydraulic control console is connected to several main oil pipes, each of which is connected to several oil distribution pipes. The total number of oil distribution pipes is the same as the number of jacks. Each oil distribution pipe is connected to a corresponding jack. An oil pump is provided on the main oil pipe. The rated pressure of the oil pump is 12MPa. Step 7 is specifically performed as follows: Step 7.1, test the concrete strength of the first section of the tower wall of the heat absorption tower. When the concrete strength reaches 6Mpa, remove the steel formwork inside and outside the first section of the tower wall of the heat absorption tower. Brush the removed steel formwork with formwork isolation agent and then hoist it to the top of the platform surface. Repair the tower wall surface after demolding and apply curing liquid. Start the jack when the concrete strength reaches 20Mpa. Step 7.2, lift the first section of the tower wall of the heat absorption tower by using a jack. The lifting height of the jack is 30 mm each time. After each lifting, take a 30-second break before lifting again. When the total lifting length reaches 500 mm, stop lifting and continue to tie steel bars to the top 500 mm of the steel mesh. When tying steel bars, use a pick rod to transport the steel bars. Step 7.3, looping step 7.2 and step 7.3 until the jacking height reaches the height of a steel template, installing steel templates in the circumferential direction inside and outside the steel mesh respectively to form the second section of the heat absorption tower wall, pouring concrete on the second section of the heat absorption tower wall, and transporting the concrete by a lift during the pouring of concrete; Step 7.4, repeat steps 7.1, 7.2 and 7.3 until the lifting height reaches the length of the steel cylinder, insert another steel cylinder with a matching inner diameter into the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh; Step 7.5, looping steps 7.1, 7.2 and 7.3, when the lifting height reaches the length of the steel cylinder again, insert another steel cylinder with a matching outer diameter into the outer side of the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh respectively; Step 7.6, alternately perform step 7.4 and step 7.5 until the entire lifting work of the heat absorption tower is completed.

Claims

1. A method for hydraulically lifting the steel formwork of a heat absorption tower concrete structure, characterized in that: The following steps are involved: Step 1: construct the first section of the heat absorption tower wall, insert a number of steel cylinders in the first section of the heat absorption tower wall along the circumferential direction, and pour concrete to bury the steel cylinders; Step 2: Set up scaffolding inside and outside the heat absorption tower; Step 3: Assemble the central drum in the heat absorbing tower, install several channel steels on the top of the first tower wall of the heat absorbing tower and fix the central drum through the channel steels, install steel rings at the bottom of all channel steels, fix a jack on the top of each channel steel and each jack is fixed on a steel drum; Step 4: Install the stay cable between the channel steel and the center drum, and install the hanger on the channel steel; Step 5: Lay wooden formwork on the top of the channel steel and set up pick rods on the wooden formwork; Step 6: Install the hydraulic system on the wooden formwork; Step 7: Lift the first section of the tower wall of the heat absorption tower, connect the steel cylinder on top of it, and repeat the operation until all lifting work is completed.

2. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 1 is characterized in that: The step 1 is specifically performed as follows: Step 1.1, tying vertical steel bars and circumferential steel bars at the first section of the pre-constructed heat absorption tower wall to form a steel mesh; Step 1.2, installing a layer of steel formwork in the circumferential direction inside and outside the steel mesh respectively to form the first section of the tower wall of the heat absorption tower; Step 1.3, insert several steel cylinders evenly along the circumferential direction at the center line of the first section of the heat absorption tower. The length of the steel cylinder is a multiple of the height of the steel template. The steel cylinder is welded to the circumferential steel bar, and the steel bar is used to obliquely reinforce the steel cylinder in the form of an eight-shaped angle, with one reinforcement at the top and bottom of the steel cylinder; Step 1.4, pour concrete into the first section of the heat absorption tower wall to bury the steel cylinder.

3. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 1 or 2, characterized in that: In the step 2, two rows of scaffolding are radially arranged inside and outside the first section of the tower wall of the heat absorption tower. The radial spacing between adjacent vertical poles on the scaffolding is 0.8m-1.2m, the lateral spacing is 1.3m-1.5m, and the longitudinal spacing is 1.2m-1.4m. Wooden boards with a thickness of 35mm-45mm are laid on the bottom of the scaffolding. The distance between the scaffolding and the tower wall of the heat absorption tower is not more than 20mm, and the height ratio of the scaffolding inside the tower and the scaffolding outside the tower is 3:

1.

4. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 2 is characterized in that: The step 3 is specifically performed as follows: Step 3.1, arrange a full-chamber support frame at the center of the inner side of the heat absorption tower, the length and width of the full-chamber support frame are both 6m and the height is 0.2m; Step 3.2, use a truck crane to sequentially hoist the three steel rings onto the inner scaffolding, connect the three steel rings sequentially in pairs through a number of vertical rods and a number of diagonal braces to form a central drum, and place the central drum on the full-height support frame. The ratio of the diameter to the height of the central drum is 1:0.9-1.1, and the preset arch height of the central drum is 40mm; Step 3.3, hinge one end of several channel steels to the outside of the top steel ring along the circumference of the central drum. The number of channel steels is the same as the number of steel drums. The length of the channel steels is not less than 12m. The extension lines of all channel steels pass through the center point of the heat absorption tower. The spacing between adjacent channel steels is 70mm-90mm. A fire basin is hung at the other end of the channel steel. The part of the end of the channel steel that exceeds 3m of the tower wall is cut off by gas cutting. The channel steel is cut symmetrically; Step 3.4, fix four steel rings with radii of 5.6m-6.2m, 7.2m-7.6m, 8.5m-9.2m, and 10m-10.8m to the bottom of all channel steels in sequence, each steel ring is symmetrical about the central drum, and lay scaffolding boards in the grooves of the channel steels; Step 3.5, fix two steel pipes with a length of 2.5m-3.5m on the top of the central drum, the two steel pipes are set relative to each other, a camera is placed on the top of one of the steel pipes, and a wind speed detector is placed on the top of the other steel pipe; Step 3.6, a jack is mounted on each steel cylinder, the support of each jack is fixed to the top of a channel steel, and the jack is fixedly connected to the support by bolts.

5. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 4 is characterized in that: The step 4 is specifically performed according to the following steps: Step 4.1, fix one end of four inclined cables at the position where the channel steel is located on the inner side of the first section of the tower wall of the heat absorption tower, and the four inclined cables are fixed in sequence from the outside to the inside, wherein the other ends of three inclined cables are fixed to the outside of the bottom steel ring through basket bolts, and the other end of another inclined cable is fixed to the outside of the center steel ring through basket bolts; Step 4.2, weld two steel bars at the ends of the channel to form a latch, and insert a railing with a height of not less than 1.2m into the latch; Step 4.3, fix a hanger by bolts at the bottom of the channel steel on both sides of the inside and outside of the first section of the tower wall of the heat absorption tower. The gap between the hanger and the tower wall is no more than 200mm. Fix the scaffolding board on the outside of the hanger by wire binding. The bottom of the hanger and the bottom of the scaffolding are completely wrapped by safety nets inside and outside the tower wall. Tighten the safety net on the inside of the hanger with a steel wire rope.

6. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 4 or 5, characterized in that: The step 5 is specifically performed according to the following steps: Step 5.1: Lay wooden formwork on the top of the channel steel to form a platform surface; Step 5.2, lift the gantry and winch onto the platform surface by using a truck crane; Step 5.3, fix the pick rod on the platform surface and at a position outside the heat absorption tower. The pick rod is located between two channel steels and 40cm-60cm away from the tower wall of the heat absorption tower; Step 5.4, fix the winch on the platform surface and at the inner side of the heat absorption tower through the angle iron, and connect the winch and the lifting rod through the wire rope.

7. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 6 is characterized in that: The hydraulic system includes a hydraulic control console, which is provided with a distribution box, a leakage protector and an oil pressure gauge. A rain cover is provided on the top of the distribution box. An oil distributor is provided inside the hydraulic control console, and a needle valve is provided on the oil distributor. The hydraulic control console is respectively connected to a number of main oil pipes, each of which is respectively connected to a number of oil distribution pipes. The total number of oil distribution pipes is the same as the number of jacks. Each oil distribution pipe is correspondingly connected to a jack. An oil pump is provided on the main oil pipe, and the rated pressure of the oil pump is not less than 12MPa.

8. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 7 is characterized in that: The step 7 is specifically performed as follows: Step 7.1, testing the concrete strength of the first section of the tower wall of the heat absorption tower, removing the steel formwork inside and outside the first section of the tower wall of the heat absorption tower when the concrete strength is not less than 6Mpa, brushing the removed steel formwork with formwork isolation agent and then hoisting it to the top of the platform surface, repairing the tower wall surface after demoulding and applying curing liquid, and starting the jack when the concrete strength is not less than 20Mpa; Step 7.2, lift the first section of the tower wall of the heat absorption tower by using a jack. The lifting height of the jack is 25mm-35mm each time. After each lifting, take a 30s break before lifting again. When the total lifting length reaches 500mm, stop lifting and continue to tie steel bars to the top 500mm of the steel mesh. Step 7.3, looping step 7.2 and step 7.3 until the jacking height reaches the height of a steel template, installing steel templates circumferentially inside and outside the steel mesh to form the second section of the heat absorption tower wall, and pouring concrete on the second section of the heat absorption tower wall; Step 7.4, repeat steps 7.1, 7.2 and 7.3 until the lifting height reaches the length of the steel cylinder, insert another steel cylinder with a matching inner diameter into the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh; Step 7.5, looping steps 7.1, 7.2 and 7.3, when the lifting height reaches the length of the steel cylinder again, insert another steel cylinder with a matching outer diameter into the outer side of the top of the steel cylinder and weld the two steel cylinders, grind the welded part, move the jack to the top of the welded steel cylinder, and install steel templates circumferentially inside and outside the steel mesh respectively; Step 7.6, alternately perform step 7.4 and step 7.5 until the entire lifting work of the heat absorption tower is completed.

9. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 8 is characterized in that: Before jacking up the first section of the tower wall of the heat absorption tower, a trial jacking and load test shall be carried out. The jacking work shall be carried out only after no abnormality is found in the trial jacking and the load test is passed.

10. The method for hydraulically lifting the steel formwork of the heat absorption tower concrete structure according to claim 8, characterized in that: When pouring concrete, concrete is transported by elevators, and when tying steel bars, steel bars are transported by levers.

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