A kind of thin-wall hollow high pier casting lifting platform and use method

Abstract

The invention discloses a thin-wall hollow high pier casting jacking platform, which relates to the field of technical building auxiliary equipment, comprises a layer of platform, wherein jacking rods are arranged on the front and rear sides of the upper surface of the layer of platform, a cross beam is connected between the upper ends of the jacking rods, a small cross beam is arranged between the front and rear ends in the middle position of the cross beam, a connecting rod is arranged at the middle position of the lower end of each small cross beam, a hydraulic device is arranged at the lower end of the connecting rod, a support frame is arranged inside the working well corresponding to the layer of platform, an inner mold is arranged on the side surface of the support frame, the platform can solve the problem that high-altitude tower cranes, artificial elevators and concrete pumping equipment must be used in traditional construction, and a large amount of equipment and resources are saved for the construction party, and the workers operate on a closed platform, which greatly improves the safety, and the whole set of platform equipment is modularly installed and disassembled, which is convenient for transfer and transportation, and can be reused many times, and has a high value of promotion and application.

Description

Technical Field

[0001] The invention relates to the field of technical building auxiliary equipment, and in particular to a thin-walled hollow high pier casting jacking platform and a use method thereof. Background Art

[0002] Thin-walled hollow high pier design is the most common form in the construction of highway bridges in mountainous areas. When constructing high piers, the current conventional construction methods are to use climbing formwork, flip formwork, sliding formwork and other construction techniques. Analyzing the advantages and disadvantages of the above mature construction techniques, first of all, the advantage of climbing formwork construction is that the quality of concrete entity and appearance is relatively good; the disadvantage is that the resource investment is large, and the requirements for the climbing formwork jacking system are more stringent in terms of mechanical properties. The advantages of sliding formwork construction are good equipment safety performance and fast construction speed; the disadvantage is that the appearance quality of the construction pier body concrete is poor and the construction control is more difficult. The advantage of flip formwork construction is that the entity and appearance quality are more guaranteed, but the investment in equipment and facilities is relatively large, and the construction progress is slower than that of sliding formwork and climbing formwork. When the pier body exceeds a certain height, it is inconvenient for construction personnel to go up and down, and the construction safety risk is higher. In many areas, the owner units explicitly require that the use of flip formwork is prohibited. During highway construction, project owners have increasingly stringent requirements on construction technology, construction progress, construction cost control and other aspects, prompting the promotion and use of new technologies, new processes and new equipment in construction, and more exploration in effectively reducing project costs, improving economic benefits and shortening construction periods. Summary of the invention

[0003] The purpose of the present invention is to provide a thin-walled hollow high pier casting jacking platform and a method of use, so as to solve the problem raised in the above background technology that when the pier body exceeds a certain height, it is inconvenient for construction workers to go up and down, the construction safety risk is higher, and the owners in many areas explicitly require that the use of flip molds is prohibited. In the construction of highways, project owners have increasingly stringent requirements on construction technology, construction progress, construction cost control and other aspects, prompting more promotion and use of new technologies, new processes, and new equipment in construction, and more exploration in effectively reducing project costs, improving economic benefits, and shortening construction periods.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thin-walled hollow high pier casting jacking platform, comprising a first-layer platform, a second-layer platform is arranged below the first-layer platform, an auxiliary platform is arranged below the second-layer platform, an operating well is penetrated in the middle position of the first-layer platform, the second-layer platform and the auxiliary platform, a plurality of groups of jacking rods are arranged on the front and rear sides of the upper surface of the first-layer platform, the number of the jacking rods in each front and rear group is two, a cross beam is connected between the upper ends of each group of the jacking rods, a small cross beam is arranged between the front and rear ends of the middle position of the two adjacent cross beams on the left and right sides, and each of the small cross beams A connecting rod is provided at the middle position of the lower end of the beam, and the upper end of the hydraulic press is provided at the lower end of the connecting rod. A support frame is provided inside the working well corresponding to the first-layer platform, and the lower end of the hydraulic press is connected to the upper surface of the support frame by bolts. An inner mold is provided on the side surface of the support frame. An outer mold No. 1 is provided inside the working well corresponding to the second-layer platform, and an outer mold No. 2 is provided inside the working well corresponding to the auxiliary platform. Fixed frames are provided on the outer surfaces of the No. 1 outer mold and the No. 2 outer mold, and an adjusting device is connected between the fixed frame and the second-layer platform.

[0005] Preferably, the first-layer platform, the second-layer platform and the auxiliary platform are all U-shaped metal frame structures formed by splicing profiles by bolts, and work plates are laid on the first-layer platform, the second-layer platform and the auxiliary platform. A frame rod is fixedly connected between the first-layer platform and the second-layer platform by bolts, one end of the adjusting device is fixedly connected to the fixing frame, and the other end of the adjusting device is fixedly connected to the inner frame rod, and a pull rod is fixedly connected between the second-layer platform and the auxiliary platform by bolts.

[0006] Preferably, the support frame includes an upper support rod, the lower end of the hydraulic press is connected to the upper support rod by bolts, the number of the upper support rods is two, the front and rear ends of the lower surfaces of the two upper support rods are provided with vertical support rods, the lower ends of the vertical support rods are rotatably connected to the lower end of the inner surface of the inner mold through bearings, a support plate is provided between the vertical support rods on the front and rear sides, the upper surface of the support plate is provided with one end of an adjusting hydraulic rod, and the other end of the adjusting hydraulic rod is rotatably connected to the upper end of the inner surface of the inner mold through a rotating shaft.

[0007] Preferably, the adjusting device includes an outer profile, which is fixedly connected to the frame rod by welding, and the inner profile is slidably connected inside the outer profile, and the inner profile is fixedly connected to the fixing frame by welding, a sleeve is provided on the frame rod and at the upper end of the outer profile, and a screw is slidably connected inside the sleeve, one end of the screw is fixedly connected to the fixing frame by welding, and the other end of the screw and the two ends of the sleeve are threadedly connected to an adjusting nut.

[0008] Preferably, a guardrail is provided on the upper surface of the auxiliary platform, and a spray pipe is provided at the outer edge of the lower surface of the auxiliary platform.

[0009] Preferably, the method comprises the following steps:

[0010] (1) Construction of the solid section at the bottom of the pier. Roughening of the top surface of the pier cap is performed, followed by processing and installation of the steel bars for the solid section. The No. 1 external mold for the solid section is installed and reinforced, and concrete is poured.

[0011] (2) Installation of the jacking platform support structure, the installation process is: the first-layer platform and the second-layer platform → the jacking rod, the cross beam, the small cross beam, the connecting rod and the hydraulic device → the support frame, and finally the auxiliary platform.

[0012] (3) After the main body of the PTZ is installed, the equipment is debugged to good operating status and a trial lift and commissioning acceptance is carried out.

[0013] (4) First lifting. During the lifting process, a hydraulic pump station controls the four hydraulic machines to lift slowly and horizontally at a uniform speed of 0.15 mm / min. Contour horizontal lines are laid out on the oil cylinder at a spacing of 30 cm. When lifting 30 cm, a horizontal adjustment is made to ensure that the entire device is in a horizontal state. After the lifting is in place, the second-layer platform is fixedly connected to the No. 1 outer mold through the fixed frame, and the hydraulic machine is not subjected to force.

[0014] (5) The first section of the hollow pier is constructed using a jacking platform. After the inner mold and the second outer mold are lifted into place using lifting equipment, debris in the mold is cleaned, a mold release agent is applied, and the second outer mold is adjusted to fit closely to the pier concrete surface through the adjustment device. The cross-sectional dimensions and verticality of the mold are measured, and stop-slurry strips are posted at the mold joints.

[0015] (6) The jacking platform is used for cyclic construction. After the bottom concrete strength reaches 10MPa or more, the platform is lifted, and the lower end of the hydraulic press is fixed on the support frame as the main force-bearing structure. After the platform is lifted into place and fixed to the second outer mold through the fixing frame and the adjusting device, the hydraulic cylinder is retracted to lift the support frame and the inner mold, and after the steel bars are installed, they are embedded and fixed, and then the first outer mold is installed and concrete is poured, and the platform is cyclically constructed.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the thin-walled hollow high pier casting jacking platform used in the construction method is an automated casting jacking equipment for the pier body construction. It integrates the technical advantages of flip mold, hanging mold, sliding mold, etc., and also has the function of split construction. The platform can solve the problem that high-altitude tower cranes, artificial elevators, and concrete pumping equipment must be used in traditional construction, saving a lot of equipment and resources for the construction party. Workers operate on a closed platform, which greatly improves safety. The entire set of platform equipment is modularly installed and disassembled, which is convenient for transfer and transportation, and can be reused many times, with high promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axonometric view of the main structure of the present invention;

[0018] Figure 2 It is a front cross-sectional view of the main structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 4 It is a left side schematic diagram of the main structure of the present invention;

[0021] Figure 5 It is an axonometric diagram of the structure of the regulating device of the present invention;

[0022] Figure 6 It is an axonometric view of the support frame structure of the present invention.

[0023] In the figure: 1-first floor platform, 2-second floor platform, 3-auxiliary platform, 4-operating well, 5-lifting rod, 6-cross beam, 7-small cross beam, 8-connecting rod, 9-hydraulic device, 10-support frame, 1001-upper support rod, 1002-vertical support rod, 1003-support plate, 1004-adjusting hydraulic rod, 11-inner mold, 12-No. 1 outer mold, 13-No. 2 outer mold, 14-fixed frame, 15-adjusting device, 1501-outer profile, 1502-inner profile, 1503-sleeve, 1504-screw, 1505-adjusting nut, 16-operating plate, 17-frame rod, 18-pull rod, 19-guardrail, 20-spray pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-6 The present invention provides a thin-walled hollow high pier casting jacking platform, comprising a first-layer platform 1, a second-layer platform 2 is arranged below the first-layer platform 1, an auxiliary platform 3 is arranged below the second-layer platform 2, an operating well 4 is penetrated in the middle of the first-layer platform 1, the second-layer platform 2 and the auxiliary platform 3, a plurality of groups of jacking rods 5 are arranged on the front and rear sides of the upper surface of the first-layer platform 1, the number of the jacking rods 5 in each group is two, a cross beam 6 is connected between the upper ends of each group of the jacking rods 5, a small cross beam 7 is arranged between the front and rear ends of the middle position of the two adjacent cross beams 6 on the left and right sides, and a connecting rod 8 is arranged in the middle position of the lower end of each small cross beam 7 The lower end of the connecting rod 8 is provided with the upper end of the hydraulic press 9, the interior of the working well 4 corresponding to the first-layer platform 1 is provided with a support frame 10, the lower end of the hydraulic press 9 is connected to the upper surface of the support frame 10 by bolts, the side surface of the support frame 10 is provided with an inner mold 11, the interior of the working well 4 corresponding to the second-layer platform 2 is provided with a No. 1 outer mold 12, the interior of the working well 4 corresponding to the auxiliary platform 3 is provided with a No. 2 outer mold 13, the outer surfaces of the No. 1 outer mold 12 and the No. 2 outer mold 13 are provided with a fixing frame 14, and an adjusting device 15 is connected between the fixing frame 14 and the second-layer platform 2.

[0026] When in use, a first-layer platform 1 and a second-layer platform 2 are set to connect the first-layer platform 1 and the second-layer platform 2 into an integral jacking platform structure, and an auxiliary platform 3 is set below the second-layer platform 2. The staff performs construction work inside the working well 4, and a jacking rod 5 is set on the first-layer platform 1, and a crossbeam 6 is set between the jacking rods 5, and the two crossbeams 6 are connected together through a small crossbeam 7. The upper end of the hydraulic press 9 is fixedly connected to the small crossbeam 7 through a connecting rod 8, and the lower end of the hydraulic press 9 is pressed against the support frame 10. The small crossbeam 7, the crossbeam 6 and the jacking rod 5 are driven by the hydraulic press 9 to make the first-layer platform 1 and the second-layer platform 2 move up and down. The inner mold 11 is set between the first-layer platform 1 and the second-layer platform 2 inside the working well 4 through the support frame 10, and the No. 2 outer mold 13 is set inside the working well 4 and outside the inner mold 11 through a fixing frame 14 and an adjusting device 15. The No. 2 outer mold 13 is set at the upper end of the No. 1 outer mold 12. The front, back, left, and right directions mentioned in the text are all based on Figure 2 Describe the basis for the direction.

[0027] The first-layer platform 1, the second-layer platform 2 and the auxiliary platform 3 are all U-shaped metal frame structures formed by splicing profiles by bolts. The first-layer platform 1, the second-layer platform 2 and the auxiliary platform 3 are all paved with work boards 16. A frame rod 17 is fixedly connected between the first-layer platform 1 and the second-layer platform 2 by bolts. One end of the adjusting device 15 is fixedly connected to the fixing frame 14, and the other end of the adjusting device 15 is fixedly connected to the inner frame rod 17. A pull rod 18 is fixedly connected between the second-layer platform 2 and the auxiliary platform 3 by bolts. By laying the work boards 16 on the first-layer platform 1, the second-layer platform 2 and the auxiliary platform 3, it is convenient for workers to stand on the work boards 16 to work. The first-layer platform 1 and the second-layer platform 2 are connected into a pan-tilt structure by the frame rod 17, and the auxiliary platform 3 is fixed under the second-layer platform 2 by the pull rod 18. When the first-layer platform 1 and the second-layer platform 2 move in the up and down directions, the auxiliary platform 3 can be driven to move at the same time.

[0028] The support frame 10 includes an upper support rod 1001, and the lower end of the hydraulic press 9 is connected to the upper support rod 1001 by bolts. There are two upper support rods 1001, and the front and rear ends of the lower surfaces of the two upper support rods 1001 are provided with vertical support rods 1002. The lower ends of the vertical support rods 1002 are rotatably connected to the lower end of the inner surface of the inner mold 11 through bearings. A support plate 1003 is provided between the vertical support rods 1002 on the front and rear sides. One end of an adjusting hydraulic rod 1004 is provided on the upper surface of the support plate 1003, and the other end of the adjusting hydraulic rod 1004 is rotatably connected to the upper end of the inner surface of the inner mold 11 through a rotating shaft. The rod 1002 is connected to the lower end of the hydraulic press 9, and the adjusting hydraulic rod 1004 is fixed to the vertical support rod 1002 through the support plate 1003. The hydraulic press 9 drives the overall support frame 10 to move in the up and down directions. When formwork casting is required, the adjusting hydraulic rod 1004 drives the front and rear inner molds 11 to rotate outward along the rotation connection between the lower end of the vertical support rod 1002 and the inner mold 11, and the casting can be carried out by resting on the left and right inner molds 11. When demolding is required, the adjusting hydraulic rod 1004 drives the front and rear inner molds 11 to rotate inward along the rotation connection between the lower end of the vertical support rod 1002 and the inner mold 11, and the inner mold 11 is separated from the concrete pier that has been cast and solidified to complete demolding.

[0029] The adjusting device 15 comprises an outer profile 1501, which is fixedly connected to the frame rod 17 by welding, an inner profile 1502 is slidably connected inside the outer profile 1501, and the inner profile 1502 is fixedly connected to the fixing frame 14 by welding, a sleeve 1503 is provided on the frame rod 17 and at the upper end of the outer profile 1501, a screw 1504 is slidably connected inside the sleeve 1503, one end of the screw 1504 is fixedly connected to the fixing frame 14 by welding, and the other end of the screw 1504 and the two ends of the sleeve 1503 are threadedly connected to an adjusting nut 1 505, by rotating two different adjusting nuts 1505 on both sides of the sleeve 1503, the screw 1504 is driven to slide in the front and rear directions inside the sleeve 1503, and the fixed frame 14 is driven to carry the No. 1 outer mold 12 or the No. 2 outer mold 13 for adjustment. When the fixed frame 14 moves, the movement of the fixed frame 14 is limited by the sliding of the inner profile 1502 inside the outer profile 1501, and then the adjusting nut 1505 is tightened to fix the position of the No. 1 outer mold 12 or the No. 2 outer mold 13, and the first platform 1 and the second platform 2 are fixed on the No. 1 outer mold 12 or the No. 2 outer mold 13.

[0030] A guardrail 19 is provided on the upper surface of the auxiliary platform 3, and a spray pipe 20 is provided at the outer edge of the lower surface of the auxiliary platform 3. By providing the guardrail 19 on the auxiliary platform 3, workers working on the auxiliary platform 3 are protected. The spray pipe 20 is provided at the lower end of the auxiliary platform 3 to spray water on the cast piers to prevent cement cracking.

[0031] The following steps are involved:

[0032] (1) Construction of the solid section at the bottom of the pier. The top surface of the pier cap is roughened, and then the solid section steel bars are processed and installed. The No. 1 outer mold 12 of the solid section is installed and reinforced, and concrete is poured. The geotextile and other debris on the top surface of the cap are removed and cleaned. The roughening should be light and meticulous, and the depth can be controlled at 1 to 2 cm. It is required to remove all the floating slurry and soft layer on the surface of the concrete to expose most of the coarse aggregate. After the roughening is completed, it is rinsed with water. It is required that there is no scum and aggregate left on the surface. The stirrups are inserted from the top of the main reinforcement and put into place. The stirrups are arranged at an equal interval of 15 cm. They are tied and fixed with binding wires. The binding wire heads are extended into the inner side of the concrete. It is strictly forbidden to face the template surface; the anti-cracking steel mesh on the outside of the hollow pier column is tied on site. First, the vertical reinforcement and the reserved reinforcement are welded and connected, and then the horizontal reinforcement is evenly arranged at equal intervals and tied and fixed with the vertical reinforcement.

[0033] (2) Installation of the lifting platform support structure. The installation process is: the first-layer platform 1 and the second-layer platform 2 → the lifting rod 5, the cross beam 6, the small cross beam 7, the connecting rod 8 and the hydraulic press 9 → the support frame 10, and finally the auxiliary platform 3. When installing the first-layer platform 1 and the second-layer platform 2, according to the designed position, first install the first-layer platform 1 and the second-layer platform 2 on both sides of the cross bridge, and then install the first-layer platform 1 and the second-layer platform 2 on both sides of the longitudinal bridge. The first-layer platform 1 and the second-layer platform 2 are spliced ​​by rods, and the rods are connected by high-strength bolts, which are stable, safe and convenient for installation and disassembly. The main truss consists of two layers, the first-layer platform 1 and the second-layer platform 2. The first-layer platform 1 is used as a construction platform for steel bar binding and concrete pouring, and the second-layer platform 2 is used as a construction platform for template installation and correction. When installing the lifting rod 5, the cross beam 6, the small cross beam 7, the connecting rod 8 and the hydraulic press 9, the bottom end of the hydraulic press 9 is fixed with the solid section concrete by bolts, and the wedge steel plate is used to adjust the verticality of the hydraulic press 9. Then install the jacking rod 5, cross beam 6, small cross beam 7, and connecting rod 8, and each frame is fixedly connected by a fixed bracket. The hydraulic press 9 is controlled by a hydraulic pump station. When the support frame 10 is installed, the lower end of the support frame 10 is rotatably connected to the inner mold 11 through a rotating shaft. When the auxiliary platform 3 is installed, after the first-layer platform 1 and the second-layer platform 2 are lifted, the bottom is connected to the auxiliary platform 3 through a pull rod 18 to form an auxiliary operation platform structure.

[0034] (3) After the main body of the PTZ is installed, the equipment will be debugged to ensure that it is in good operating condition, and a trial lift and commissioning acceptance will be carried out. After the installation and commissioning of the PTZ is completed, the installation quality, safety measures and mechanical performance of the PTZ will be accepted mainly based on the process requirements. It can only be put into use after confirming that the installation and performance of the device meet the process requirements.

[0035] (4) First lifting. During the lifting process, a hydraulic pump station controls four hydraulic machines 9, and the lower end of the hydraulic machine 9 is against the solid cement pier, and the lifting is slow and horizontal at a uniform speed of 0.15m / min. Contour horizontal lines are laid out on the oil cylinder at intervals of 30cm. When the lifting is 30cm, a horizontal adjustment is made to ensure that the device is in a horizontal state as a whole. After the lifting is in place, the second-layer platform 2 is fixedly connected to the No. 1 outer mold 12 through the fixing frame 14, and the hydraulic machine 9 is not subjected to force.

[0036] (5) The first section of the hollow pier column is constructed using a jacking platform. After the inner mold 11 and the second outer mold 13 are lifted into place using a hoisting device, the debris in the mold is cleaned, a mold release agent is applied, and the second outer mold 13 is adjusted to be close to the concrete surface of the pier column through the adjustment device 15. In order to reduce the space occupied by the lifting frame for the main reinforcement and ensure the spacing between the main reinforcements, a limit device is welded on the lifting frame to strictly limit the position of each main reinforcement; the horizontal stirrups are passed through the top of the main reinforcement and positioned and installed using a vertical reinforcement positioning bracket. Single-sided welding is used at the overlap, and the welding length meets the 10d welding requirement. After the reinforcement is installed, the support frame 10 is pre-buried, which is also the hydraulic machine 9 support device for the gantry to lift again. The fit of the inner mold 11 is adjusted by adjusting the hydraulic rod 1004, and the fit of the second outer mold 13 is adjusted by the adjustment device. The cross-sectional dimensions and verticality of the mold are measured, and a stop strip is posted at the joint of the mold before pouring.

[0037] (6) The jacking platform is used for cyclic construction. After the bottom concrete strength reaches 10MPa or more, the platform is lifted. The lower end of the hydraulic press 9 is fixed on the support frame 10. At this time, the vertical friction between the support frame 10 and the inner mold 11 and the cast pier is greater than the overall setting gravity, which serves as the main force-bearing structure. After the platform is lifted into place and fixed to the second outer mold 13 through the fixing frame 14 and the adjusting device 15, the hydraulic press 9 cylinder is retracted to lift the support frame 10 and the inner mold 11. After the steel bar is installed, it is embedded and fixed. Then the first outer mold 12 is installed and concrete is cast. The platform is cyclically constructed.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thin-walled hollow high pier casting jacking platform, characterized in that: The invention comprises a first-layer platform (1), a second-layer platform (2) is arranged below the first-layer platform (1), an auxiliary platform (3) is arranged below the second-layer platform (2), an operation well (4) is arranged through the middle positions of the first-layer platform (1), the second-layer platform (2) and the auxiliary platform (3), a plurality of groups of lifting rods (5) are arranged on the front and rear sides of the upper surface of the first-layer platform (1), the number of the lifting rods (5) in each group is two, a cross beam (6) is connected between the upper ends of each group of the lifting rods (5), a small cross beam (7) is arranged between the front and rear ends of the middle positions of two adjacent cross beams (6) on the left and right sides, a connecting rod (8) is arranged at the middle position of the lower end of each small cross beam (7), and the lower end of each connecting rod (8) is provided with a connecting rod (8). The upper end of the hydraulic press (9) is provided, and a support frame (10) is provided inside the working well (4) corresponding to the first-layer platform (1). The lower end of the hydraulic press (9) is connected to the upper surface of the support frame (10) by bolts. The side surface of the support frame (10) is provided with an inner mold (11). The working well (4) corresponding to the second-layer platform (2) is provided with a No. 1 outer mold (12). The working well (4) corresponding to the auxiliary platform (3) is provided with a No. 2 outer mold (13). The outer surfaces of the No. 1 outer mold (12) and the No. 2 outer mold (13) are both provided with a fixing frame (14). An adjusting device (15) is connected between the fixing frame (14) and the second-layer platform (2).

2. A thin-walled hollow high pier casting jacking platform according to claim 1, characterized in that: The first-layer platform (1), the second-layer platform (2) and the auxiliary platform (3) are all U-shaped metal frame structures formed by splicing profiles by bolts. The first-layer platform (1), the second-layer platform (2) and the auxiliary platform (3) are all paved with work plates (16). A frame rod (17) is fixedly connected between the first-layer platform (1) and the second-layer platform (2) by bolts. One end of the adjustment device (15) is fixedly connected to the fixing frame (14), and the other end of the adjustment device (15) is fixedly connected to the inner frame rod (17). A pull rod (18) is fixedly connected between the second-layer platform (2) and the auxiliary platform (3) by bolts.

3. The thin-walled hollow high pier casting jacking platform according to claim 1, characterized in that: The support frame (10) comprises an upper support rod (1001), the lower end of the hydraulic press (9) is connected to the upper support rod (1001) by bolts, the number of the upper support rods (1001) is two, the front and rear ends of the lower surfaces of the two upper support rods (1001) are provided with vertical support rods (1002), the lower ends of the vertical support rods (1002) are rotatably connected to the lower end of the inner surface of the inner mold (11) through bearings, a support plate (1003) is provided between the vertical support rods (1002) on the front and rear sides, and one end of an adjusting hydraulic rod (1004) is provided on the upper surface of the support plate (1003), and the other end of the adjusting hydraulic rod (1004) is rotatably connected to the upper end of the inner surface of the inner mold (11) through a rotating shaft.

4. A thin-walled hollow high pier casting jacking platform according to claim 2, characterized in that: The adjusting device (15) comprises an outer profile (1501), wherein the outer profile (1501) is fixedly connected to the frame rod (17) by welding, an inner profile (1502) is slidably connected inside the outer profile (1501), and the inner profile (1502) is fixedly connected to the fixing frame (14) by welding, a sleeve (1503) is provided on the frame rod (17) and at the upper end of the outer profile (1501), a screw rod (1504) is slidably connected inside the sleeve (1503), one end of the screw rod (1504) is fixedly connected to the fixing frame (14) by welding, and the other end of the screw rod (1504) and at both ends of the sleeve (1503) are threadedly connected to an adjusting nut (1505).

5. The thin-walled hollow high pier casting jacking platform according to claim 1, characterized in that: A guardrail (19) is provided on the upper surface of the auxiliary platform (3), and a spray pipe (20) is provided at the outer edge of the lower surface of the auxiliary platform (3).

6. The method for using the thin-walled hollow high pier casting jacking platform according to claim 1, characterized in that: The following steps are involved: (1) Construction of the solid section at the bottom of the pier, roughening the top surface of the pier cap, then processing and installing the steel bars of the solid section, installing and reinforcing the No. 1 outer mold (12) of the solid section and pouring concrete, (2) Installation of the lifting platform support structure, the installation process is: the first-layer platform (1) and the second-layer platform (2) → the lifting rod (5), the cross beam (6), the small cross beam (7), the connecting rod (8) and the hydraulic device (9) → the support frame (10), and finally the auxiliary platform (3) etc. (3) After the main body of the PTZ is installed, the equipment is in good running condition and tested for lifting and commissioning acceptance. (4) First lifting: During the lifting process, a hydraulic pump station controls four hydraulic machines (9) to lift slowly and horizontally at a uniform speed of 0.15 m / min. Contour horizontal lines are laid out on the oil cylinder at intervals of 30 cm. When the lifting is 30 cm, a horizontal adjustment is made to ensure that the device is in a horizontal state as a whole. After the lifting is in place, the second-layer platform (2) is fixedly connected to the No. 1 outer mold (12) through the fixing frame (14). The hydraulic machine (9) is not subjected to force. (5) The first section of the hollow pier is constructed using a jacking platform. After the inner mold (11) and the second outer mold (13) are lifted into place using a hoisting device, debris in the mold is cleaned, a mold release agent is applied, and the second outer mold (13) is adjusted to fit closely to the concrete surface of the pier using the adjustment device (15). The cross-sectional dimensions and verticality of the mold are measured, and stop-slurry strips are posted at the joints of the molds. (6) The jacking platform is used for cyclic construction. After the bottom concrete strength reaches 10 MPa or above, the platform is lifted. The lower end of the hydraulic press (9) is fixed on the support frame (10) as the main force-bearing structure. After the platform is lifted into place and fixed to the second outer mold (13) through the fixing frame (14) and the adjusting device (15), the hydraulic press (9) cylinder is retracted to lift the support frame (10) and the inner mold (11). After the steel bars are installed, they are embedded and fixed. Then, the first outer mold (12) is installed and concrete is poured. The platform is then cyclically constructed.

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