Large door opening funnel ring beam reinforcing and supporting construction method for large-diameter silo slip form lifting system

Abstract

The invention provides a large door opening funnel ring beam reinforcing and supporting method for a large-diameter silo slip form lifting system, which is based on the large-diameter silo slip form lifting system, and the slip form lifting system comprises a template system, an operation platform system and a hydraulic system, the construction method comprises the following specific steps in sequence: construction preparation, template system assembly, operation platform system assembly, hydraulic system assembly, slip form lifting system reinforcement and slip form construction, slip form lifting system disassembly and silo top construction. Wherein a door opening reinforcing step and a funnel ring beam reinforcing step are arranged between the slip form construction step and the slip form lifting system dismantling step. The method has remarkable effects in the aspects of construction efficiency, reinforcing and stability of a large-diameter silo slip form lifting system, a reserved large door opening reinforcing and supporting technology in the slip lifting process and a funnel ring beam reinforcing and supporting technology, meanwhile, the situation that a large reserved opening stops sliding and waits is avoided, the forming quality and construction efficiency of concrete are improved, and the construction cost is reduced. And the coal storage silo has wide application prospect and popularization value at the moment that the coal storage silo becomes larger and larger.

Description

Technical Field

[0001] The invention relates to the technical field of large-diameter coal silo construction, and in particular to a large-sized door opening hopper ring beam reinforcement support construction method for a large-diameter silo slipform lifting system. Background Art

[0002] Coal silos are widely used in coal chemical industry, coal, electricity, ports, mining and other industries. They have complex structures, difficult construction and high technical requirements. At present, the construction of large-diameter coal silos mainly includes the prestressing of foundation, silo wall and buttresses, ring beam, inner tube, funnel, cone hopper, silo platform, silo roof structure, silo wall and funnel. The silo wall, buttresses and inner tube are generally constructed by slipform technology.

[0003] At present, the conventional slipform process has the following defects: 1. The overall stability of the large-diameter conventional slipform lifting system is insufficient during the large-diameter slipform construction process, which can easily lead to horizontal center deviation and vertical deviation; 2. The overall rigidity of the slipform to the large reserved opening is insufficient, which can easily lead to support deformation at the opening and even cause the construction to stop. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a method for reinforcing and supporting a large-sized door opening funnel ring beam for a large-diameter silo slipform lifting system. The above conventional slipform process has been innovated, and remarkable results have been achieved in terms of construction efficiency, reinforcement and stability of large-diameter silo slipform lifting systems, reinforcement and support technology for reserved large door openings during the sliding process, and reinforcement and support technology for funnel ring beams. At the same time, it also avoids the situation of stopping and waiting for sliding at large reserved openings, improves the molding quality and construction efficiency of concrete, and has broad application prospects and promotion value at a time when coal storage silos are becoming increasingly large-scale.

[0005] The specific plan is as follows:

[0006] A large-scale door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system is characterized in that, based on the large-diameter silo, the slipform lifting system includes a formwork system, an operating platform system and a hydraulic system, and the specific steps are as follows: construction preparation, formwork system assembly, operating platform system assembly, hydraulic system assembly, slipform construction, slipform lifting system dismantling and silo roof construction; wherein, door opening reinforcement and funnel ring beam reinforcement steps are provided between the slipform construction and the slipform lifting system dismantling.

[0007] Furthermore, the assembly of the formwork system includes installing the lifting frame, installing the steel pipe enclosure and installing the steel formwork in sequence, wherein when placing the lifting frame, the plane where the lifting frame is located is perpendicular to the bottom plate surface, and the center line of the horizontal plane of the lifting frame points to the center of the silo. After confirming that the position is correct, temporary support reinforcement is performed; when a silo temporarily installs and fixes 4 to 8 lifting frames, check whether the elevations of the upper and lower brackets on the outside are the same, and if they are different, adjust them to the same plane; hoist the steel ring beam to the upper bracket on the outside of the lifting frame and place it, while adjusting its elevation and aligning the center of the circle. When the error is 3mm, it is considered qualified and is welded to the lifting frame; along the steel ring beam, install the remaining lifting frames according to the positioning line of the lifting frame on the bottom plate, and fix them to the steel ring beam ; The corbels of the special-shaped lifting frame should be welded later, and the lower steel ring beam should be installed after the upper steel ring beam is installed; when installing the steel pipe circle, place the steel pipe circle on the inner corbel of the lifting frame column in the order of inside first and then outside, bottom first and then top, and connect the circle into a whole, but do not weld the joints first; before installing the steel formwork, apply an isolation agent on the surface of the formwork, and then assemble it in the order of inside first and then outside; the geometric dimensions must be accurate when the formwork is spliced; adjust the screw at the steel corbel to make the formwork taper, with 0.1% for the outer form and 0.4% for the inner form, then fill the hook bolts and tighten them, fill the U-shaped buckles, and at the same time ensure that the taper of the formwork is still within the design range. When the taper of the formwork meets the design requirements, spot weld the steel pipe circle to the lifting frame column.

[0008] Furthermore, when the operating platform system is assembled, the connection of each node is firm, and the combined steel truss is hoisted according to the top plate structure positioning line. The upper chord of the steel truss is placed on the upper steel ring beam and welded, and the bottom surface of the lower chord is welded to the top surface of the lower steel ring beam; a piece of steel formwork is left uninstalled at staggered intervals on both sides of the beam, which is used as a steel reinforcement binding opening in the beam; before supporting the formwork, the steel reinforcement at the bottom of the beam is inserted into the stirrups and placed in the formwork together; the platform steel pipe truss is arranged, horizontal supports are set between adjacent trusses, wooden beams are laid on the trusses, and thick plywood is laid on the wooden beams, leaving manholes; the board surface is flush with the sliding formwork opening and the beam opening formwork; the external hanging scaffolding is set up before the platform slides; the upper part of the steel pipe in the lifting frame column is buckled, and the lower horizontal pipes and the vertical pipes are connected with right-angle fasteners to make diagonal pull rods; at the same time, the steel pipes laid on the steel bull legs of the combined beam steel truss are used to hang down the steel pipes to set up a simple demolding platform, and the safety net is fully hung.

[0009] Furthermore, when the hydraulic system is assembled, jacks with similar strokes are installed in the same group of oil circuits; the oil distribution pipe enters under the plate after being connected with the main oil pipe connected to the hydraulic control console, is laid along the radial ribs, and is connected to the plate surface and the jack along the lifting frame column. When the oil pipe crosses the connection with the cylinder wall, it is laid along the lifting frame column and the crossbeam, and the oil pipe on the plate surface is laid along the lifting frame crossbeam without colliding with the structural steel bars; after the hydraulic control device is installed and tested, the support rod is installed; the support rod is located at the center of the jack's perforation and is aligned with a plumb line.

[0010] Furthermore, during the slipform construction, the processes of tying steel bars, pouring concrete and sliding formwork are interconnected and repeated in a continuous cycle; other processes, including checking the center line and verticality, adjusting the lift difference, extending or reinforcing supporting rods, embedding iron parts and reserving holes, repairing the concrete surface and plastering the cylinder wall, are all carried out in an interspersed manner.

[0011] Furthermore, the sliding template comprises the following steps in sequence:

[0012] (1) Trial and initial lifting:

[0013] The initial rise starts from the top surface of the foundation and is poured in continuous layers of 1200mm. When the concrete strength reaches between the initial setting and the final setting, that is, the penetration resistance value is above 0.3-0.35KN / cm2, a trial rise is carried out. During the trial rise, the formwork is first raised by 60mm, that is, the jack is raised by 1-2 strokes. When the concrete does not collapse after being ejected from the formwork and is not lifted by the formwork, the initial rise is carried out, and the concrete is lifted 30cm at a time in the initial rise stage. After the trial rise is completed, the quality of all formworks and welding installation parts is checked.

[0014] (2) Normal lift:

[0015] 1. After pouring each layer of concrete, raise the formwork by one pouring layer, pour continuously and slide up continuously;

[0016] 2. Repeat the continuous work of steel bar binding, concrete pouring, formwork lifting, concrete finishing, and pole extension. At the same time, measure and control the construction accuracy of the formwork platform's torsion, sliding height, and support pole extension.

[0017] 3. Under normal temperature, the time for lifting the formwork each time is controlled at about 1.5 hours. When the concrete pouring time is long, start the console every 30 minutes to lift 1 to 2 strokes, with a spacing of 3 cm between each stroke;

[0018] (3)Last promotion

[0019] 1. Slide up to near the top, measure the elevation of the concrete and make corresponding marks; speed up the pouring speed when pouring the last layer of concrete, and level the concrete in the mold in time; after pouring the last layer of concrete, lift the template by 30cm, and then re-vibrate the template once to ensure the section width;

[0020] 2. Stop sliding method: within 2 hours after the completion of the above work, that is, the last layer of concrete is poured, lift it every half an hour until the formwork is separated from the concrete, and control the sliding height.

[0021] Furthermore, when reinforcing the door opening, multiple groups of steel door-shaped supports are used for reinforcement, and are connected to the climbing poles of the slipform lifting system to form a whole; according to the span and height of the door opening and the concrete load above the door opening, door-shaped brackets with corresponding support specifications and quantities are designed, and the support system is welded. After welding, an integral rigid system is formed with the climbing poles of the slipform lifting system to ensure the overall stability of the slipform lifting system when sliding through the door opening, while reducing the sliding speed, thereby achieving the safety of continuous slipform construction after passing the door opening.

[0022] Furthermore, the reinforcement of the funnel ring beam includes: air sliding construction slipform reinforcement, formwork and support reinforcement and concrete pouring.

[0023] Furthermore, in the slip form reinforcement of the air sliding construction, the pouring of concrete is stopped when the cylinder wall slides up to the bottom of the funnel top ring beam, and additional rods are implanted in the cylinder wall in advance, with the additional rods arranged one by one; after demoulding, the inner mold and the inner hanger are removed; before air sliding, an elevation correction is performed, and the initial air sliding is started when it is determined that the frame is at the same elevation; after the initial air sliding height of 1.2m is completed, the control console is turned off and the sliding is stopped, and another elevation correction is performed. After the horizontal elevation is correct, the second sliding is performed. The second sliding height is 1.2m, which is completed in 5 times, 200mm each time. At this time, the climbing The rods are connected horizontally to make all climbing rods have better integrity; after the second slide is completed, stop the sliding formwork, check the horizontal elevation and the verticality of the formwork, and start the third and final frame slide after the frame is normal; the third slide height is 1.1m, which is completed in 5 strokes, each stroke is 220mm, and the reinforcement of the climbing rods in this slide is the same as the second slide; after the formwork frame slides to the designed elevation, lock the bottom of the jack with a limit block, and set a 6m long diagonal rod from the root of the cantilever frame at the bottom of the ring beam to support the upper platform of the sliding formwork, and 8 diagonal rods are set in the coal bunker.

[0024] Furthermore, the dismantling of the slipform lifting system is carried out 2 days after the end of the sliding lift, and the dismantling is carried out in accordance with the principle of installing first and then dismantling with the help of a tower crane; the dismantling sequence is: dismantling cables, dismantling high-pressure oil pipes and hydraulic presses, dismantling formwork, dismantling inner and outer platform plates, dismantling inner and outer hangers, and disassembling by blocks.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention connects the lifting platform into a whole through channel steel welding to form a rigid system, reinforces the slipform lifting system, controls the roundness and stability of the slipform lifting system, and adopts centralized control of the slipform hydraulic control system to make the sliding system climb stably, thus overcoming the concrete side pressure of the large-diameter thick-walled silo.

[0027] 2. The large door opening reserved in the sliding formwork process of the present invention is reinforced with multiple sets of steel door-type supports, and is connected to the climbing rods of the sliding formwork lifting system into a whole; the specifications and quantity of the steel pipe door-type supports are designed according to the span and height of the door opening and the concrete load above the door opening, thereby satisfying the overall stability of the sliding formwork lifting system when sliding through the door opening and the safety of continuous sliding formwork construction after passing the door opening.

[0028] 3. The funnel ring beam of the present invention is reinforced by using triangular vertical poles to strengthen the climbing pole, so that the safety and stability of the silo slipform lifting system are also improved. The slipform lifting system can be safely lifted to a certain height by air sliding to meet the construction of the funnel ring beam. The structural integrity of the ring beam and the funnel in the silo is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the present invention.

[0030] Figure 2 It is a schematic diagram of the additional rod and the climbing rod when the cylinder wall slides up to the bottom of the funnel ring beam.

[0031] Figure 3 This is the overall diagram of the mold frame's first air sliding.

[0032] Figure 4 This is a detailed drawing of the climbing pole reinforcement.

[0033] Figure 5 This is the horizontal connection steel bar diagram.

[0034] Figure 6 This is the sign that the third ascent is complete.

[0035] Figure 7 Form an overall rigid support diagram for the funnel and ring beam. DETAILED DESCRIPTION

[0036] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0037] like Figure 1 As shown, the present application provides a large-scale door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system. Based on the large-diameter silo slipform lifting system, the slipform lifting system includes a formwork system, an operating platform system and a hydraulic system. The specific steps are as follows: construction preparation, formwork system assembly, operating platform system assembly, hydraulic system assembly, slipform construction, slipform lifting system dismantling and silo roof construction; wherein, door opening reinforcement and funnel ring beam reinforcement steps are provided between the slipform construction and the slipform lifting system dismantling.

[0038] The following is a detailed description of this application scheme in conjunction with the construction of four silos in a coal storage and transportation system bunker project. The four silos have a diameter of 27m and a height of 47.6m. This project is a large-diameter silo construction.

[0039] In this embodiment, the construction preparation specifically includes:

[0040] 1. Construction site preparation

[0041] (1) Complete the design of the slipform lifting system. In view of the large diameter and large wall thickness of the coal silo of the coal storage and transportation device of the relocation project of Xinyi Yangguang Thermal Power Co., Ltd., which is 27m in diameter, 47.6m in height and 800mm in thickness, the design adopts 12# channel steel as the portal crossbeam and 16# channel steel as the column to form 74 portal frames. The platform support beam (adjustment beam) adopts 8# channel steel, the platform support beam diagonal brace adopts L63×6 angle steel, the support rod adopts Φ48 steel pipe, the portal frame reinforcement ring adopts 8# channel steel, the template ring adopts 8# channel steel, and 74 GYD-60 ball-through hydraulic jacks are adopted.

[0042] (2) Pop out the cylinder wall line on the raft foundation, support the wooden formwork and cast a 30cm high concrete guide wall. After removing the formwork, smooth the cylinder wall with 1:2 cement mortar according to the cylinder wall line, and the thickness meets the design requirements.

[0043] (3) Clean the working surface of the sliding platform assembly, remove the garbage, and straighten the dowel bars on the bottom plate.

[0044] (4) Pop up the standard axis for measurement and set up vertical control points.

[0045] (5) The positioning lines of the pop-up lifting frame, steel ring beam, steel mold and the positioning lines of the warehouse roof plate components.

[0046] 2. Hydraulic control device: Test the device on site to check the sensitivity of each pressure gauge and whether each component is working normally.

[0047] 3. The special slipform construction plan has been verified by experts.

[0048] 4. Construction personnel must complete on-site training and safety technical briefings. Electricians, welders, scaffolders, crane operators, slipformers and other special operations personnel must be certified before they can take up their posts.

[0049] In this embodiment, the template system assembly specifically includes:

[0050] 1. Install the lifting frame:

[0051] According to the plan layout of the lifting frame, it is installed in the designed position according to the model on the silo wall where the line has been drawn. When placing the lifting frame, the plane where the lifting frame is located should be perpendicular to the bottom plate surface, and the center line of the horizontal plane of the lifting frame should point to the center of the silo. Use a level ruler and plumb bob to check its horizontal and verticality, and a theodolite to check its center position. After confirming that its position is correct, temporarily support and reinforce it. After temporarily installing and fixing about 4 to 8 lifting frames in a silo, check whether the elevations of the upper and lower brackets on the outside are the same. If they are different, adjust them to the same plane. Lift the steel ring beam to the upper bracket on the outside of the lifting frame and place it. At the same time, adjust its elevation and align the center of the circle. When the error is 3mm, it is considered qualified and welded to the lifting frame. Along the steel ring beam, install the remaining lifting frames according to the positioning line of the lifting frame popped up on the bottom plate and fix them to the steel ring beam. When installing according to this method, the brackets of the special-shaped lifting frame should be welded later, and the lower steel ring beam should be installed after the upper steel ring beam is installed.

[0052] 2. Install the steel pipe enclosure:

[0053] Place the steel pipe enclosure on the inner side of the lifting frame column in the order of inside first, outside second, bottom first, top second, and connect the enclosure into a whole, but do not weld the joints first. When installing the enclosure, check the horizontal, vertical and center position of the lifting frame frequently, and check the spacing between the inner and outer enclosures.

[0054] 3. Install steel formwork:

[0055] Before installing the steel formwork, apply an isolation agent on the surface of the formwork, and then assemble it in the order of inside first and outside later. The formwork panels must be assembled according to the drawings, and the installation must ensure that its geometric dimensions are accurate. Use U-shaped buckles to fasten the steel formwork but do not fully buckle it first. Small 3-shaped buckles and hook bolts are buckled at intervals but not tightened, and staggered in the upper and lower circles.

[0056] Adjust the screw at the steel bracket to make the template taper, and adjust its taper to the design value, 0.1% for the outer mold and 0.4% for the inner mold. Then fill the hook bolts and tighten them, fill the U-shaped buckle, and check whether the template taper is still within the design range. If not, adjust it again.

[0057] Check the taper of the inner and outer templates every 2 meters along the circumferential direction and record the data; when the template taper meets the design requirements, spot weld the steel pipe ring and the lifting frame column appropriately.

[0058] In order to ensure the safety, stability and construction efficiency of the large-diameter slipform lifting system, it is particularly important to systematically improve the integrity of the lifting frame, enclosure and steel formwork. The lifting frame, enclosure and steel formwork should be considered as a whole to ensure that the three are coordinated in structure, function and force, and jointly bear the construction load. First, add reinforcement beams and diagonal braces at the bottom and key positions of the lifting frame to enhance the frame's ability to resist lateral displacement and overturning. Introduce a hydraulic automatic adjustment system to automatically adjust the frame's height and posture according to the construction progress and load changes to maintain its stability. Secondly, use high-strength bolts instead of traditional welding or ordinary bolts during the installation of the enclosure to improve the connection strength and accuracy of the enclosure and reduce deformation. Design appropriate flexible elements at the enclosure connection to absorb vibration and deformation during construction and protect structural integrity. Thirdly, use node reinforcement measures to weld and reinforce key nodes, increase welding area and weld depth, improve node bearing capacity, and add local reinforcements at the nodes, such as reinforcement plates and ribs, to further enhance the stiffness and strength of the nodes. Finally, weld the lifting frame enclosure and the hydraulic climbing rod into a whole through channel steel and round steel of Ф25 or above to form a rigid force system and improve the overall stability of the slipform lifting system. Install displacement, stress, vibration and other sensors to monitor the operating status of the slipform lifting system in real time and detect and handle abnormal situations in a timely manner.

[0059] In this embodiment, the operating platform system assembly specifically includes:

[0060] When assembling the operating platform, the connection of each node must be firm. According to the pop-up top plate structure positioning line, the combined steel truss is hoisted, the upper chord of the steel truss is placed on the upper steel ring beam and welded, and the bottom surface of the lower chord is welded to the top surface of the lower steel ring beam; for the silo with a cast-in-place beam structure on the top plate, the beam formwork is assembled according to the drawing, and a piece of steel formwork is left at staggered intervals on both sides of the beam, which is used as the steel bar binding opening in the beam. Before supporting the formwork, the steel bars at the bottom of the beam should be inserted into the stirrups and placed in the formwork together.

[0061] Arrange the steel pipe trusses of the platform according to the drawing, and place them on the steel trusses at the ends of each truss. Horizontal supports should be set between adjacent trusses, with a spacing of 1000mm; the spacing between truss uprights should be controlled at about 800mm. Lay 50×100 wooden beams on the trusses, with a spacing of 300mm; lay 18mm thick plywood on the wooden beams, leaving a manhole. The board surface is level with the slip formwork and beam mouth formwork. Lay a temporary cover on the beam mouth formwork.

[0062] Before the platform is lifted, the external hanging scaffolding is set up; after the platform is lifted, the hanging scaffolding is set up. The top of the steel pipe in the lifting frame column must be fastened, and the horizontal pipes below are connected to the vertical pipes with right-angle fasteners to make diagonal rods to prevent the vertical pipes from bending. At the same time, the steel pipes laid on the steel legs of the composite beam steel truss are used to hang down the steel pipes to set up a simple demoulding platform, and the safety net is fully hung.

[0063] Lay out various power lines on the operating platform, including the layout of the gate box, the installation of lighting facilities, etc. The power supply line must be well insulated and protected from leakage, with additional casing and laid along the crossbeam on the lifting frame.

[0064] In this embodiment, the hydraulic system assembly specifically includes:

[0065] The jacks should be installed in place according to the design requirements, and jacks with similar strokes should be installed in the same group of oil circuits as much as possible to facilitate the adjustment of stroke differences. When installing the jack, the casing should be inserted into the lower pad of the jack and installed, and the pad should be solid and secure.

[0066] The oil circuit should be laid along the bottom of the operating platform according to the design plan. When installing the oil pipes, they should be blown through one by one first to prevent dirt from clogging the oil pipes. The pipe joints should be wiped clean and no dirt should be stored. After the oil pipe is connected to the main oil pipe connected to the hydraulic control console, it will enter the bottom of the board and be laid along the radial ribs, from the lifting frame column to the board surface and connected to the jack. When the oil pipe crosses the connection point of the cylinder wall, it should be laid along the lifting frame column and beam, and be careful not to touch the structural steel bars. The oil pipe on the board surface should be laid along the lifting frame beam and should not touch the structural steel bars. If the high-pressure oil pipe needs to turn, its bending radius should not be less than 9 to 10 times the diameter of the hose, and it should not be bent at the joint. The shortest distance from the joint to the bending part should be more than 6 times the diameter of the hose. The joint should be covered with a plastic pipe for protection.

[0067] The hydraulic control device should be tested before installation to check whether the rotation direction of the oil pump is correct and whether the signal is sensitive. Then place it firmly according to the designed position and orientation, and pad it firmly. After connecting the grouped oil pipes to the hydraulic control device, fill and exhaust the pipeline. When filling the oil, the stop valves of the jacks on the oil circuit should be fully opened to fill each jack with oil. When the grouped oil circuit bleed valve discharges oil, it means that the pipeline oil is full, and then close the valve.

[0068] Finally, carry out the overall pressure test according to the product manual, increase the pressure to 10N / mm2, do 5 cycles, check the working conditions of the oil pump, reversing valve, jack and oil circuit, adjust the overflow valve to make everything qualified, and replace any unqualified ones.

[0069] The support rod can be installed only after the hydraulic control device has passed the installation test. The support rod should be located at the center of the jack hole and aligned with a plumb bob.

[0070] The hydraulic control system is particularly important during the construction of large-diameter silos. In order to improve the overall performance of the system, reduce operating costs, and enhance reliability and safety, the traditional hydraulic system is improved in the following aspects: ① Optimize the pump source efficiency, replace the traditional fixed-displacement pump with a variable-displacement pump, automatically adjust the output flow and pressure according to load demand, reduce energy loss, use variable-frequency motor drive to achieve precise control of the pump speed, further reduce energy consumption, use advanced sealing materials and technologies to reduce internal and external leakage, and improve pump efficiency; ② Simplify the hydraulic circuit, use CAD / CAE software for fluid dynamics simulation, simplify the pipeline layout, reduce unnecessary elbows and joints, reduce pressure loss, introduce multifunctional integrated valve blocks, reduce the number of components, improve system integration, facilitate management and maintenance, and use quick connectors between replaceable or frequently maintained parts. Simplify the disassembly and assembly process; ③ Intelligent control integration, build a programmable control system based on PLC, combined with the human-machine interface (HMI), realize remote monitoring and intelligent operation, install pressure, temperature, flow and other sensors at key locations, collect data in real time, provide a basis for optimized control, and use data analysis technology to achieve early warning and rapid diagnosis of system failures; ④ Leak detection and repair, use non-contact leakage detection technology such as ultrasonic and infrared to quickly locate the leakage point, design automatic compensation or emergency sealing devices in some leak-prone parts to reduce downtime caused by leakage, ⑤ Energy saving and cooling, use the energy recovery device during braking to convert part of the kinetic energy into electrical energy or hydraulic energy for recycling, use high-efficiency coolers, combined with intelligent temperature control systems, automatically adjust the cooling water flow according to the oil temperature, and achieve energy saving and consumption reduction. ⑥ Safety protection and alarm, set up multiple safety devices such as overload protection, overpressure protection, temperature protection, etc. to ensure the safe operation of the system, install emergency stop buttons, and automatically trigger sound and light alarms under abnormal conditions to remind operators to deal with them in time. Through the comprehensive improvements in the above aspects, the performance of the sliding mode hydraulic system can be significantly improved, the operating costs can be reduced, the reliability and safety of the system can be enhanced, and greater economic benefits can be created for the enterprise.

[0071] In this embodiment, the reinforcement construction of the slipform lifting system specifically includes:

[0072] In slipform construction, the three main processes of tying steel bars, pouring concrete and lifting formwork are interconnected and repeated continuously. The overall stability of the slipform lifting system of large-diameter thick-walled silos is particularly important, and strict calculations are required to determine the reinforcement parameters of the lifting system. Other processes, such as testing the center line and verticality, adjusting the lifting difference, extending or reinforcing the support rods, pre-embedded iron parts and reserved holes, repairing the concrete surface and plastering the cylinder wall, etc. should be interspersed.

[0073] 1. Steel bar binding

[0074] The first section of steel bar binding should be done before the formwork is assembled, and then the steel bars should be tied as the formwork is lifted. When the formwork is slipping, the steel bars should also be tied to the crossbeam under the lifting frame. When sliding, the horizontal and vertical bars are placed on the steel pipe brackets in the tube, so that the steel bars can be pulled out and penetrated into the tube wall.

[0075] 2. Concrete pouring

[0076] In addition to meeting the strength grade required by the design, it should also meet the requirements of slipform construction. Generally, the initial setting time of concrete should be around 3 to 5 hours, and the final setting time should be around 6 to 10 hours. The demoulding strength of concrete is around 0.2 to 0.4 N / mm2 (penetration resistance value is 0.3 to 1.05 KN / cm2). Generally, the surface is checked by finger pressure. Those that show slight finger marks but are not sticky or deeply sunken are qualified. Those with sticky and deeply sunken surfaces indicate that the strength is insufficient and should be temporarily delayed. Those with a hard surface and no finger marks indicate that the strength is too high and should be accelerated. The demoulding strength of concrete should be checked no less than 4 times per work shift. When the temperature changes suddenly or the concrete mix ratio changes within a work shift, the number of inspections must be increased accordingly.

[0077] When the concrete is first poured, the pouring height is 600-700mm, and it is poured in 2-3 layers, but it must be completed before the initial setting. When entering the normal sliding state, the thickness of each pouring layer is controlled at about 300mm, and the construction time of each pouring layer cannot be more than 4.0h. When the thickness of the top layer of concrete is too small, it can be poured at the same time as the next layer. During normal sliding, the surface of the newly poured concrete should be kept 100mm away from the top of the formwork to prevent the concrete from being lifted up when the formwork is lifted, and it also serves as a mark for the horizontal reinforcement binding.

[0078] When the sliding formwork enters the unlifted stage (i.e., the stage close to the horizontal structure, this stage is the empty sliding stage). At this time, on the one hand, the debris on the platform should be cleaned up, and the unused tools, equipment, and materials should be hoisted to the ground to reduce the load on the platform; on the other hand, the elevation monitoring should be strengthened, and each part should be poured according to the designed elevation. The slump of concrete can be reduced at this stage.

[0079] 3. Template sliding

[0080] (1) Trial and initial lifting:

[0081] Initial lifting starts from the top surface of the foundation and pours continuously in layers of 1200mm. When the concrete strength reaches between the initial setting and the final setting, that is, the penetration resistance value is above 0.3-0.35KN / cm2, the trial lifting work can be carried out. During the trial lifting, the formwork is first raised by 60mm, that is, the jack is lifted by 1-2 strokes. When the concrete does not collapse after leaving the mold and is not lifted by the formwork (finger marks can be seen when pressing with fingers, and the mortar does not stick to fingers), check whether the enclosure and steel formwork are deformed. If there is no deformation, the initial lifting can be carried out. The initial lifting stage is lifted by 30cm at a time. If an abnormal situation occurs, the cause should be analyzed and decisive measures should be taken. After the trial lifting, the quality of all formworks and welding installation parts should be checked.

[0082] (2) Normal lift:

[0083] 1. After each layer of concrete is poured (about 300 mm), the formwork is raised to the height of one pouring layer, and the pouring and sliding are continued in sequence.

[0084] 2. That is, steel bar binding → concrete pouring → formwork lifting → concrete finishing → pole extension, repeat the continuous cycle. At the same time, the construction accuracy of the formwork platform torsion, sliding height, etc. is measured and controlled, and the support rod extension is performed.

[0085] 3. Under normal temperature, the time for lifting the formwork each time should be controlled at about 1.5 hours. When the concrete pouring time is long for some reason, the console should be started every 30 minutes and lifted 1 to 2 strokes, with a spacing of 3 cm between each stroke.

[0086] (3)Last promotion

[0087] 1. Slide up to the top (close to the design elevation of 1m), measure the elevation of the concrete and make corresponding marks. When pouring the last layer of concrete, the pouring speed should be accelerated as much as possible, and the concrete in the mold should be leveled in time. After the last layer of concrete is poured, the template is lifted 30cm, and the template is re-vibrated once to ensure the section width.

[0088] 2. Stop sliding method: within 2 hours after the completion of the above work, that is, the last layer of concrete is poured, lift it every half an hour until the formwork is separated from the concrete, and control the sliding height.

[0089] 4. Detection and monitoring

[0090] (1) Predicted control of horizontality

[0091] ①Control of horizontality: During the sliding process, keeping the entire formwork system horizontal and synchronous is the key to ensuring the quality of the sliding formwork construction and is also an important factor affecting the verticality of the building. Due to the asynchronous phenomenon of the jack during the sliding process, there is a difference in the elevation between the various parts of the formwork system, which causes the displacement and tilt of the operating platform and the verticality deviation of the building, affecting the quality of the project.

[0092] ②Measurement of horizontality: Limit leveling method: The principle of this method is to draw the same horizontal mark on each support rod every 250-300mm, and set a limit device at the same elevation, so that each jack climbs 250-300mm and then the limiter stops the climbing, so that the high-position jack stops climbing first, while the low-position jack can continue to climb until it reaches the same elevation. This leveling method can achieve leveling every 250-300mm. Commonly used limit devices include hydraulic limit valves, limit leveling cards, etc.

[0093] (2) Measurement and control of verticality

[0094] ①Verticality measurement: Theodolite measurement method: Using theodolite to measure verticality in slipform construction is also a common method. This method is to set up several control points on the ground in advance, and then set up the theodolite on them to observe the displacement of each control point on the operating plane, and can directly observe the verticality changes of the warehouse wall that has slid out of the template. This method of using theodolite to measure verticality can be used simultaneously with the plumb bob method;

[0095] ②Verticality control and correction: Under normal circumstances, the vertical deviation of the silo can be solved by adjusting the horizontal deviation of the operating platform. In the silo slipform construction, the verticality control usually adopts the following methods: Adjust the horizontal height difference control method: During the slipform construction, when the silo has a vertical deviation of displacement to one side, a negative horizontal deviation will generally appear on the same side of the operating platform. At this time, the jack on the side with a lower elevation should be immediately raised so that the operating platform on this side is higher than the elevation of the jacks on other parts, and then the entire operating platform is slid up a height so that the vertical deviation can be corrected.

[0096] In this embodiment, the reinforcement of large door openings specifically includes:

[0097] The large door openings that need to be reserved during the sliding process of the slipform are reinforced with multiple sets of steel door-shaped supports and connected to the climbing poles of the sliding lifting system into a whole; according to the span, height and concrete load above the door opening, the Xinyi silo project reserves a door opening with a width of 10 meters and a height of 7 meters. After calculation, 108 steel pipes and 10# channel steels are used to form 9 sets of door-shaped brackets. The support system is welded to form an integral rigid system with the climbing poles of the sliding lifting system after welding, which meets the overall stability of the sliding lifting system when sliding through the door opening, while slowing down the sliding speed and achieving the safety of continuous sliding construction after passing the door opening.

[0098] In this embodiment, the reinforcement of the funnel ring beam specifically includes:

[0099] 1. Slipform reinforcement for air sliding construction

[0100] When the cylinder wall slides up to the bottom of the funnel top ring beam, stop pouring concrete, and implant additional rods in the cylinder wall in advance, with additional rods arranged one by one, and the implantation depth is 2m. After demoulding, remove the inner mold and inner hanger; before empty sliding, perform an elevation correction, and start the initial empty sliding when the frame is at the same elevation. The empty sliding height should be 200mm, and follow up to check whether there is oil leakage or pump damage. Taking the empty sliding height of 3.5 meters in this project as an example, the initial empty sliding height is completed in 6 times, with a cumulative stroke of 1.2m. The climbing rod is vertically strengthened within the 1.2m range to increase the rigidity of the climbing rod.

[0101] After the initial air sliding height of 1.2m is completed, turn off the console to stop sliding, and then perform another elevation correction. After the horizontal elevation is correct, perform the second sliding. The second sliding height is 1.2m, which is completed in 5 times, 200mm each time. At this time, the climbing poles need to be connected horizontally to make all the climbing poles have better integrity.

[0102] After the second sliding is completed, stop the sliding formwork and check the horizontal elevation and the verticality of the formwork. If there is any deviation, use the "limit adjustment method" to correct it. After the frame is normal, start the third and final frame sliding.

[0103] The third slide, the third slide height is 1.1m, completed in 5 strokes, each stroke is 220mm, and the reinforcement of the climbing pole for this slide is the same as the second slide.

[0104] After the formwork is slid to the designed elevation, the limit block is used to lock the bottom of the jack, and a 6m long inclined rod is set from the root of the cantilever frame at the bottom of the ring beam to support the upper platform of the sliding formwork. Eight inclined rods are set in the coal bunker. Generally, the inclined rod does not need to be supported by the empty sliding. In this scheme, the inclined rod is set to support the additional auxiliary function of stabilizing the frame.

[0105] The three-step sliding procedure is as follows:

[0106] (1) Before the cylinder wall slides up to the bottom of the funnel ring beam, a set of additional rods (2 rods) are embedded in the cylinder wall concrete. The additional rods are made of ordinary scaffolding pipes and are embedded in the cylinder wall 2m deep, one every other. The additional rods and climbing rods form an equilateral triangle. Figure 2 shown.

[0107] When the formwork is first slid up, short steel bars are welded between the additional rod and the climbing rod to form a triangular lattice column. Figure 3 shown.

[0108] The first slide is 1.2m high. At this time, the climbing pole has just been reinforced and has good rigidity. Generally, no special inspection is performed. It is sufficient to meet the elevation requirements and the mechanism operates normally. Figure 4 shown.

[0109] (2) After the first slide is completed, check the horizontal elevation of the frame and start preparing for the second slide. The second slide height is 1.2m and is completed in 6 steps. From this slide, it is necessary to connect the climbing poles with horizontal steel bars so that all climbing poles form a unified whole. The horizontal steel bar connection spacing is 500mm, and the steel bar diameter is 25. Figure 5 shown.

[0110] (3) The third empty slide is the same as the second one. Continue to reinforce the climbing pole and set the horizontal connecting steel bars. If the formwork has a vertical deviation at this time, the "limit adjustment method" can be used to correct the deviation. The specific method is to lower or raise the elevation of the limit block on the top of the cylinder on the side where the vertical deviation occurs, control the oil supply time, and extend the local single-rod sliding stroke to achieve the correction effect.

[0111] After the third sliding is completed, the limit block is locked to the bottom of the oil cylinder to support the frame and prevent it from falling. This situation will not happen under normal circumstances. At the same time, 8 6-meter-long steel pipes are set from the root of the cantilever frame to the end of the upper platform of the formwork to play a certain auxiliary supporting role. Figure 6 shown.

[0112] 2. Formwork and support reinforcement

[0113] Ensure that the funnel and ring beam form an overall rigid support system, such as Figure 7 shown.

[0114] 3. Concrete pouring

[0115] The funnel and ring beam concrete pouring adopts the segmented pouring method. In order to ensure the integrity of the funnel and the ring beam, the concrete at the top of the funnel must be poured at the same time as the concrete at the bottom of the ring beam.

[0116] In this embodiment, dismantling the slipform equipment specifically includes:

[0117] The dismantling of the slipform equipment should be carried out 2 days after the end of the sliding. The dismantling should be carried out on the principle of installing first and then dismantling, using a tower crane.

[0118] 1. Dismantling order:

[0119] Remove cables → remove high-pressure oil pipes and hydraulic press → remove formwork → remove inner and outer platform plates → remove inner and outer hangers → disassemble into blocks.

[0120] 2. Demolition requirements

[0121] 1. Before dismantling the slipform device, a professional dismantling team must be organized and a designated person must be responsible for unified command. Construction personnel must be assigned to specific positions and supervisors must be appointed.

[0122] 2. All personnel who participate in the demolition work must undergo technical training and pass the examination before they can work. Operators shall not be replaced arbitrarily during the work.

[0123] 3. Vertical transportation equipment and machinery used during demolition must be inspected and approved before use.

[0124] 4. Before dismantling the slipform device, check the firmness of the embedded parts at each supporting point and whether the up and down aisles for staff are safe and reliable.

[0125] 5. The demolition work must be carried out during the day, and it is advisable to adopt the method of segmented and overall demolition and dismantling on the ground. The demolished parts and all items on the operating platform shall not be thrown from a high altitude.

[0126] 6. When encountering thunderstorm, fog or wind force of level 5 or above, the dismantling of the slipform device shall not be carried out.

[0127] 7. Each type of work should be explained carefully and have a dedicated person to be in charge of the direction.

[0128] 8. First remove the electrical facilities, hydraulic system and formwork on the platform, then remove the internal and external hanger scaffolding, and then gradually dismantle it with the help of the tower crane.

[0129] 9. In order to ensure safe and convenient dismantling, the platform should be reinforced and fixed in advance.

[0130] In this embodiment, the slipform construction quality assurance measures are as follows:

[0131] 1. Quality assurance measures for slipform construction

[0132] (1) The success or failure of slipform construction and the quality of the project depend on the control of the slip speed. The appropriate slipform speed should be determined according to the climate conditions during the construction period. The established slipform speed should be maintained during the construction process, which is affected by factors such as the operation time of each process and the vertical transportation time. Therefore, during actual construction, the configuration of machinery and personnel should be adjusted according to various influencing factors.

[0133] (2) Measurement is an important means to ensure the verticality of the shallow circular silo. Responsible operators should be selected to carry out the measurement. The results should be delivered to the platform in a timely manner, and the instruments used for measurement should be calibrated regularly.

[0134] (3) The quality of the outer surface is determined by the strength of the concrete out of the mold and the quality of the operators, among which the strength of the concrete out of the mold has a greater impact, which is determined by the sliding speed. Therefore, the reasonable sliding speed should be determined by combining experiments and construction site experience.

[0135] 2. Quality assurance measures for warehouse wall surface

[0136] (1) The silo sliding formwork uses a new factory formwork with tight joints and a smooth surface.

[0137] (2) During the lifting process, the operating platform should be kept level, the relative height difference of the jacks should not be greater than 50 mm, and the height difference between two adjacent jacks should not be greater than 25 mm.

[0138] (3) On the inner and outer columns of the scaffolding, the operating scaffolding is hung below, the scaffolding boards are laid on top, and the safety net is wrapped outside to check the strength of the concrete demoulding. After the slip formwork, the warehouse wall is trimmed, the reserved and embedded parts are cleaned, and the original slurry is smoothed (the concrete surface of the inner and outer warehouse walls is painted).

[0139] (4) A dedicated person shall be responsible for pre-embedded parts and reserved parts. Once the embedded parts, reserved holes and reserved dowel bars are removed from the mold, they shall be chiseled out immediately. Pay attention to finding the correct position before proceeding to avoid affecting the surface of the warehouse wall.

[0140] (5) To maintain the uniform color of the silo wall, it is required that all concrete used for the silo wall slipforms should be from the same factory, with the same grade and batch number. The raw materials and proportions of concrete used in the engineering slipforms should be as uniform as possible to ensure the uniform color of the concrete coming out of the slipforms.

[0141] (6) The inner and outer walls of the silo should be smoothed with original slurry as they slide, and wooden trowels should be used to remove the traces of mold lifting and other uneven areas. All should be smooth and beautiful. The pores should be filled, and the potholes should be brushed flat. There should be no depressions or protrusions. For the pollution such as slurry hanging and leakage that is easy to occur during the sliding process, a sponge strip should be tied at the bottom of the template to absorb the slurry water of slurry hanging and leakage in time to avoid hanging.

[0142] (7) Surface treatment and maintenance of the warehouse wall: The inside and outside of the warehouse wall are smoothed as they slide. In principle, the surface is polished to the original state and then pressed. If local repair is required, the original slurry should be screened from the slipform concrete to ensure that the color of the repaired area is consistent with other parts. When this project is sliding, special attention should be paid to the treatment of defects at the column corners and the places where the pouring is stopped. The warehouse wall is watered and maintained as it slides to ensure that the concrete surface is moist. After the slipform construction is completed, before the formwork is removed, the warehouse wall is inspected and partially treated with scaffolding.

[0143] 3. Allowable deviation of silo wall quality: see the table below

[0144] Table of allowable deviation of silo wall quality

[0145]

[0146] In this embodiment, the economic benefits of the present invention are as follows:

[0147] 1. The continuity and safety of the construction process are ensured through the reinforcement technology of the funnel ring beam sliding formwork lifting system and the reinforcement technology of the large door opening of the silo.

[0148] 2. Strengthen and support measures for the empty sliding of large silo doors and funnel ring beams to improve the continuity and safety of the slipform lifting system construction and improve construction efficiency.

[0149] 3. The original planned construction period for each warehouse slipform construction was 60 days, and the actual construction period using this method was 42 days, saving 18 days, and a total of 72 days was saved for the four warehouses; the original planned construction period for the pouring of the single warehouse funnel ring beam concrete was 21 days, and the actual construction period was 14 days, saving 7 days for each warehouse, and a total of 28 days was saved for the four warehouses. See the table below for cost details.

[0150] Cost saving statistics

[0151]

[0152]

[0153] In this embodiment, the social benefits of the present invention are as follows:

[0154] The coal chemical industry has increasingly higher requirements for the quality and quantity of bulk storage of coal and other bulk materials. With the continuous increase in production demand, coal storage silos are developing towards large-scale development. Currently, such large-diameter coal storage silos are basically built with integral concrete structures. With the development of the national economy and the changes in the global climate, large-diameter silos have a very broad application prospect in various fields such as electricity, coal, metallurgy, petrochemicals, ports, etc. due to their economic and environmental protection.

[0155] The large-diameter silo funnel ring beam slipform lifting system reinforcement technology can make full use of the silo slipform lifting system to solve the structural integrity of the funnel ring beam and the funnel in the silo. At the same time, the safety, stability and sliding speed of the silo slipform lifting system are improved, realizing uninterrupted slipform construction and advancing the overall construction progress of the silo.

[0156] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A large-sized portal funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system, characterized in that: Based on the large-diameter silo slipform lifting system, the slipform lifting system includes a formwork system, an operating platform system and a hydraulic system. The specific steps are as follows: construction preparation, formwork system assembly, operating platform system assembly, hydraulic system assembly, slipform lifting system reinforcement and slipform construction, slipform lifting system dismantling and silo roof construction; among them, there are also door opening reinforcement and funnel ring beam reinforcement steps between the slipform construction and the slipform lifting system dismantling.

2. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 1 is characterized in that: The template system assembly includes installing the lifting frame, installing the steel pipe enclosure and installing the steel template in sequence. When placing the lifting frame, the plane where the lifting frame is located is perpendicular to the bottom plate surface, and the center line of the horizontal plane of the lifting frame points to the center of the silo. After confirming that the position is correct, temporary support reinforcement is performed; after a silo temporarily installs and fixes 4 to 8 lifting frames, check whether the elevations of the upper and lower brackets on the outside are the same, and if they are different, adjust them to the same plane; hoist the steel ring beam to the upper bracket on the outside of the lifting frame and place it, and adjust its elevation and align the center of the circle at the same time. When the error is 3mm, it is considered qualified and welded to the lifting frame; along the steel ring beam, install the remaining lifting frames according to the positioning line of the lifting frame on the bottom plate, and fix them to the steel ring beam; the brackets of the special-shaped lifting frames should be welded later, and the lower steel ring beam should be installed after the upper steel ring beam is installed; When installing the steel pipe enclosure, place the steel pipe enclosure on the inner side of the lifting frame column in the order of inside first, outside second, bottom first, top second, and connect the enclosure into a whole, but do not weld the joints first; Before installing the steel formwork, apply an isolation agent on the surface of the formwork, and then assemble it in the order of inside first and outside later; ensure the geometric dimensions are accurate when the formwork is assembled; adjust the screw at the steel corbel to make the formwork taper, 0.1% for the outer formwork and 0.4% for the inner formwork, and then fill the hook bolts and tighten them, fill the U-shaped buckles, and at the same time ensure that the taper of the formwork is still within the design range. When the taper of the formwork meets the design requirements, spot weld the steel pipe ring to the lifting frame column.

3. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 2 is characterized in that: When the operating platform system is assembled, the connection of each node is firm, and the combined steel truss is hoisted according to the top plate structure positioning line. The upper chord of the steel truss is placed on the upper steel ring beam and welded, and the bottom surface of the lower chord is welded to the top surface of the lower steel ring beam; a piece of steel formwork is left uninstalled at staggered intervals on both sides of the beam, which is used as a steel bar binding opening in the beam; the steel bars at the bottom of the beam are inserted into the stirrups before supporting the formwork and placed in the formwork together; the platform steel pipe truss is arranged, and horizontal supports are set between adjacent trusses. Wooden beams are laid on the trusses, and thick plywood is laid on the wooden beams, leaving manholes; the board surface is flush with the slipform template opening and the beam template opening; the lifting platform is connected into a whole by channel steel welding to form a rigid system, the slipform lifting system is reinforced, and the roundness and stability of the slipform lifting system are controlled. Before the platform is lifted, set up the external scaffolding; fasten the top of the steel pipe in the lifting frame column, connect the horizontal pipes and vertical pipes below with right-angle fasteners to form diagonal braces; at the same time, use the steel pipes laid on the steel corbels of the composite beam steel truss to hang down the steel pipes to set up a simple demoulding platform, and hang the safety net fully.

4. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 3 is characterized in that: When the hydraulic system is assembled, jacks with similar strokes are installed in the same group of oil circuits; the oil distribution pipe enters under the plate after being connected with the main oil pipe connected to the hydraulic control console, is laid along the radial ribs, and is connected to the plate surface and the jack along the lifting frame column. When the oil pipe crosses the connection with the cylinder wall, it is laid along the lifting frame column and the crossbeam. The oil pipe on the plate surface is laid along the lifting frame crossbeam without colliding with the structural steel bars; after the hydraulic control device is installed and tested, the support rod is installed; the support rod is located at the center of the jack's perforation and is aligned with a plumb line.

5. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 4 is characterized in that: During the slipform construction, the processes of tying steel bars, pouring concrete and sliding formwork are interconnected and repeated in a continuous cycle; other processes, including checking the center line and verticality, adjusting the rise difference, extending or reinforcing supporting rods, embedding iron parts and reserving holes, repairing the concrete surface and plastering the cylinder wall, are all carried out in an interspersed manner.

6. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 5 is characterized in that: The sliding template comprises the following steps in sequence: (1) Trial and initial lifting: Initial rise starts from the top of the foundation and pours continuously in layers for 1200mm. When the concrete strength reaches between initial setting and final setting, the penetration resistance value is between 0.3 and 0.35 KN / cm 2 When the concrete is above the standard, a trial lift is carried out. During the trial lift, the formwork is first raised by 60mm, that is, the jack is lifted 1 to 2 strokes. When the concrete does not collapse after being ejected from the formwork and is not lifted up by the formwork, the initial lift is carried out. In the initial lift stage, the concrete is lifted 30cm at a time. After the trial lift is completed, the quality of all formworks and welding installation parts is checked. (2) Normal lift:

1. After pouring each layer of concrete, raise the formwork by one pouring layer, pour continuously and slide up continuously; 2. Repeat the continuous work of steel bar binding, concrete pouring, formwork lifting, concrete finishing, and pole extension. At the same time, measure and control the construction accuracy of the formwork platform's torsion, sliding height, and support pole extension.

3. Under normal temperature, the time for lifting the formwork each time is controlled at about 1.5 hours. When the concrete pouring time is long, start the console every 30 minutes to lift 1 to 2 strokes, with a spacing of 3 cm between each stroke; (3)Last promotion 1. Slide up to near the top, measure the elevation of the concrete and make corresponding marks; speed up the pouring speed when pouring the last layer of concrete, and level the concrete in the mold in time; after pouring the last layer of concrete, lift the template by 30cm, and then re-vibrate the template once to ensure the section width; 2. Stop sliding method: within 2 hours after the completion of the above work, that is, the last layer of concrete is poured, lift it every half an hour until the formwork is separated from the concrete, and control the sliding height.

7. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 6 is characterized in that: When reinforcing the door opening, multiple groups of steel door-shaped supports are used for reinforcement, and are connected to the climbing poles of the slipform lifting system to form a whole. According to the span and height of the door opening and the concrete load above the door opening, door-shaped brackets with corresponding support specifications and quantities are designed, and the support system is welded. After welding, an integral rigid system is formed with the climbing poles of the slipform lifting system to meet the overall stability of the slipform lifting system when sliding through the door opening, while reducing the sliding speed, thereby achieving the safety of continuous slipform construction after passing the door opening.

8. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 7 is characterized in that: The reinforcement of the funnel ring beam includes: air sliding construction slipform reinforcement, formwork and support reinforcement and concrete pouring.

9. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 8 is characterized in that: In the slip form reinforcement of the air sliding construction, the pouring of concrete is stopped when the cylinder wall slides up to the bottom of the funnel top ring beam, and additional rods are implanted in the cylinder wall in advance, and the additional rods are arranged one by one; after demoulding, the inner mold and the inner hanger are removed; before the air sliding, an elevation correction is performed, and the initial air sliding is started when it is determined that the frame is at the same elevation; after the initial air sliding height of 1.2m is completed, the control console is turned off and the sliding is stopped, and another elevation correction is performed. After the horizontal elevation is correct, the second sliding is performed. The second sliding height is 1.2m, which is completed in 5 times, 200mm each time. At this time, the climbing rod needs to be adjusted. Horizontal connection makes all climbing poles have better integrity; after the second slide is completed, stop the sliding formwork, check the horizontal elevation and the verticality of the formwork, and start the third and final frame slide after the frame is normal; the third slide height is 1.1m, which is completed in 5 strokes, each stroke is 220mm, and the reinforcement of the climbing poles in this slide is the same as the second slide; after the formwork frame slides to the designed elevation, lock the bottom of the jack with a limit block, and set a 6m long diagonal rod from the root of the cantilever frame at the bottom of the ring beam to support the upper platform of the sliding formwork, and 8 diagonal rods are set in the coal bunker.

10. The large-sized door opening funnel ring beam reinforcement support method for a large-diameter silo slipform lifting system according to claim 8 is characterized in that: The dismantling of the slipform lifting system is carried out 2 days after the end of the sliding lift. The dismantling is carried out in accordance with the principle of installing first and then dismantling with the help of a tower crane. The dismantling sequence is: dismantling cables, dismantling high-pressure oil pipes and hydraulic presses, dismantling formwork, dismantling inner and outer platform plates, dismantling inner and outer hangers, and disassembling by blocks.

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