Construction process of squat silo top formwork system

Abstract

The invention discloses a construction technology of a squat silo top formwork system, and belongs to the technical field of silo construction, and the construction technology comprises construction of a conical shell top plate supporting system, and comprises the following steps: reserved hole construction: when a silo wall slip form is constructed to an elevation, a plurality of reserved holes are uniformly distributed in a silo wall along the circumferential direction; mounting a central upright post, hoisting the central upright post to a foundation at the central position of the warehouse, arranging four cable ropes for temporary fixation, then erecting double-row scaffolds around the upright post, and carrying out column embracing connection by using steel pipe fasteners and a central steel pipe every 1.5 meters; a top conversion platform is installed, the assembled conversion platform is lifted to the top of the center stand column through a tower crane, and the conversion platform is in bolt connection with the center stand column through a round pipe; bailey frames are installed, the two sides of one end of each Bailey piece are welded to the conversion platform through channel steel to limit sliding of the Bailey beams, the other end of each Bailey piece is placed at the reserved hole of the bin wall, and the Bailey beams are placed in the central symmetry direction in sequence. The stability of the supporting system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of silo construction, and in particular relates to a construction process of a shallow circular silo roof formwork system. Background Art

[0002] Shallow silos, as large-diameter silo structures, often utilize a conical shell roof support system for roof construction. Traditional construction methods often rely on full-height scaffolding or integral hoisting techniques, which are associated with high material consumption, long construction periods, and high safety risks associated with high-altitude operations. In particular, existing technologies for Bailey frame systems suffer from deficiencies such as insufficient central support system stability, difficulty controlling Bailey beam installation accuracy, and weak circumferential connection stiffness, which can easily lead to excessive overall formwork deformation.

[0003] Existing technology often uses a single-section, integral hoisting method for central columns. Limited by the lifting capacity of the equipment, this approach is inadequate for ultra-high supports exceeding 24 meters. Furthermore, Bailey beam installation often relies on a sequential hoisting method, lacking strict symmetrical installation control, which can easily generate eccentric loads and compromise structural stability. Conventional bolts are often used for circumferential connections, making it difficult to effectively constrain the lateral displacement of the Bailey beam.

[0004] Especially in the construction of large-diameter shallow circular silos, the existing technology has the following technical bottlenecks: 1) The high-altitude assembly accuracy is difficult to ensure, and the verticality deviation of the central column often exceeds 50mm; 2) The anti-slip performance of the Bailey beam connection node is insufficient, resulting in a decrease in the overall stiffness of the support system; 3) The connection method between the cantilevered working platform and the main structure is unreliable, posing a safety hazard; 4) The formwork system has poor self-stability, and uneven settlement is prone to occur during concrete pouring. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction process for a shallow circular silo roof formwork system to solve the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] A construction process for a shallow silo roof formwork system includes the construction of a conical shell roof support system. The construction process of the conical shell roof support system includes the following steps:

[0008] S1: Reserved opening construction

[0009] When the silo wall is constructed with slipforms to the elevation, multiple reserved holes are evenly distributed along the circumference of the silo wall to serve as one end support point of the Bailey frame;

[0010] S2: Install the center column

[0011] After the central column is hoisted to the center of the warehouse, four guy ropes are set up for temporary fixation. Then, double rows of scaffolding are set up around the column. Steel pipe fasteners are used to connect the column to the central steel pipe every 1.5 meters.

[0012] S3: Install the top transfer platform

[0013] Complete the assembly of the transfer platform on the ground, lift the assembled transfer platform to the top of the central column using a crane, and connect it to the central column with bolts through a round tube;

[0014] S4: Install Bailey Rack

[0015] Lift the Bailey beam to the top of the transfer platform. Weld channel steel to the transfer platform on both sides of one end of the Bailey plate to limit the slippage of the Bailey beam. Place the other end in the reserved hole in the warehouse wall. Place the Bailey beams in a centrally symmetrical order. Simultaneously, install the Bailey frame's circumferential channel steel.

[0016] S5: Review

[0017] Check whether all high-strength bolts at the connections of each component are installed, spot-check the torque value of the high-strength bolts, and verify the verticality deviation of the conical shell top plate support system.

[0018] Furthermore, in step S2, the height of the central column is 24m, and it is assembled from 7 sections of 3m and 3 sections of 1m steel pipes, and each section is connected by 16 high-strength bolts through flanges.

[0019] Furthermore, in step S2, the step of installing the central column includes:

[0020] P1: The leveling of the center column foundation should be controlled within ±2mm;

[0021] P2: After the bottom section steel pipe is in place, measure the verticality of the bottom section steel pipe, and the deviation is required to be less than 2mm;

[0022] P3: After the bottom section of steel pipes are installed, the remaining steel pipes are hoisted. After the remaining steel pipes are in place, first measure the verticality. The accuracy requirements are the same as above. After meeting the requirements, tighten the high-strength bolts of the flanges between the steel pipes. The same is divided into initial torque and final torque. The tightening order of the high-strength bolts of each flange is along the diagonal direction, and the flange is tightened along the diagonal direction;

[0023] P4: After tightening the high-strength bolts of the flange, follow the operation method of P3 to tighten the high-strength bolts between each tie rod and the main pipe of the scaffolding;

[0024] P5: Measure the installation accuracy again. Once it meets the requirements, connect the diagonal rods between the columns. The construction sequence and torque value of the high-strength bolts are the same as above. The verticality deviation of the overall center column is less than 40mm.

[0025] Furthermore, in step S3, the installation step of the conversion platform includes:

[0026] T1: Platform Assembly

[0027] On the ground, weld the I-beam, connecting plate, and disc to form a transfer platform;

[0028] T2: Platform Installation

[0029] After the platform is in place, use high-strength bolts to connect it to the lower center column. The final torque value of the high-strength bolts is not less than 720N-M. Process a 1m long center column and weld 16 ear plates on the lower connecting plate. The column and the I-beam are connected by 16 evenly arranged round tube bolts. The final torque value of the bolts is the same as above.

[0030] Furthermore, in step S4, the assembly order of the Bailey beam is as follows: the Bailey plates are assembled on the ground and then hoisted. During hoisting, the Bailey plates should be hoisted in a two-point symmetrical manner to ensure that the Bailey plates are in a horizontal state after hoisting. Then, four Bailey plates in the symmetrical direction are installed first. The subsequent installation adopts symmetrical installation, and the hoisting operation area is divided according to the hoisting procedure. The installation is carried out simultaneously in the divided areas and in an equal order. During the installation process, the principle of symmetrical installation should be followed, that is, the Bailey beam should be installed symmetrically starting from the middle span and extending symmetrically to both ends.

[0031] Furthermore, in step S4, the number of Bailey beams in a single warehouse is 37. A single Bailey beam is connected by a special pin shaft with one section of non-standard Bailey plate with a length of 1.65 meters, two sections of standard Bailey plates with a length of 3 meters, and one section of 2 meters and one section of 1.5 meters of standard Bailey plates to form a single Bailey beam. The length of a single Bailey beam is 11.15 meters. One beam is arranged every 10° in the circumferential direction. The Bailey beams are arranged in a radial type toward the center of the silo. The upper and lower chords of the Bailey beam are connected by 10# U-bolts through circumferential 8# channel steel. The spacing of the circumferential channel steel is: one channel of 650mm-900mm for the upper chord and a total of 5 channels for the lower chord to increase overall stability.

[0032] Furthermore, the construction of the cantilever gutter support system includes the following steps:

[0033] E1: Sleeve embedded

[0034] When the silo wall is slipformed, when it slides to the preset height, pre-buried shear bolt sleeves with a spacing of 650mm above and below the silo, with a tripod spacing of 1.2m, serve as bolt supports for the cantilever eaves support and the installation of the external protective frame. After the sleeves are out of the formwork, they should be cleaned in time to make them exposed;

[0035] E2: Installation of external eaves support and external protective frame

[0036] Before dismantling the slipform, the pre-made external tripod is fixed to the embedded sleeve of the warehouse wall with bolts using the slipform hanger. Then, scaffolding pipes and bamboo springboards are laid on each external tripod to form a circular cantilever frame as a supporting platform for the cantilevered eaves and a pedestrian passage. Three guardrails are installed on the scaffolding pipe uprights at the end, and a dense mesh is hung to form a closed external protection.

[0037] The construction process of a shallow circular silo roof formwork system provided by the present invention has the following advantages compared with the prior art:

[0038] 1. Improved support system stability:

[0039] The central column is connected by segmented flanges, combined with double-row scaffolding column connections and four-way guy rope fixation, so that the overall verticality deviation is controlled within 40mm, which is significantly improved compared to traditional processes.

[0040] The Bailey beams are densely connected in the circumferential direction through 8# channel steel and U-bolts to form a rigid grid structure, which significantly improves the overall lateral stiffness and effectively suppresses non-uniform deformation during the concrete pouring stage.

[0041] 2. Construction efficiency and cost optimization:

[0042] The Bailey beam adopts ground pre-assembly + symmetrical hoisting technology, which reduces the amount of high-altitude work and shortens the construction period;

[0043] The combination of modular conversion platform (I-beam + connecting plate welding) and standard Bailey plates (1.65m non-standard + 3m / 2m / 1.5m standard sections) reduces the proportion of customized components and significantly improves the material reuse rate.

[0044] 3. Enhanced installation accuracy and safety:

[0045] The center column flange bolts are initially torqued and finally torqued in diagonal order, combined with three-level verticality checks to ensure that the support axis is stressed;

[0046] The cantilevered eaves adopt a pre-embedded shear-resistant sleeve + tripod system to form a closed protection platform, reducing the risk of falling from height.

[0047] 4. Enhanced structural adaptability:

[0048] The reserved opening design and the welded limiter of the Bailey beam end channel steel can adapt to shallow silos with a diameter of 30-50m, solving the problem of slippage of the large-span silo roof support system;

[0049] The flexible connection between the annular channel steel and the Bailey beam chord (U-bolts are adjustable) allows ±5mm dynamic deformation compensation to avoid node cracking caused by stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0051] Figure 1 It is a structural schematic diagram of the present invention;

[0052] Figure 2 A diagram showing the connection between the reserved opening and the Bailey beam of the present invention;

[0053] Figure 3 It is a side view of the conversion platform of the present invention;

[0054] Figure 4 A top view of the conversion platform of the present invention;

[0055] Figure 5 A diagram showing the connection between the Bailey plate and the conversion platform of the present invention;

[0056] Figure 6 This is a schematic structural diagram of the overhanging gutter support system of the present invention;

[0057] Figure 7 It is a top view of the cantilever gutter support system of the present invention.

[0058] In the figure: 1-reserved opening, 2-Bailey beam, 3-center column, 4-guy rope, 5-conversion platform, 6-I-beam, 7-connecting plate, 8-circular plate, 9-circular tube, 10-tripod, 11-scaffolding tube, 12-Bailey plate. DETAILED DESCRIPTION

[0059] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments:

[0060] refer to Figure 1-5 As shown, the present invention provides a construction process for a shallow silo roof formwork system, including: construction of a conical shell top plate support system, the construction process of the conical shell top plate support system includes the following steps:

[0061] S1: Reserved opening construction

[0062] When the silo wall slipform construction reaches an elevation of 25.15 meters (reserved hole bottom elevation), 37 reserved holes 1 with a width of 300, a depth of 200, and a height of 250-350 mm are evenly distributed along the circumference of the silo wall to serve as one end support of the Bailey frame.

[0063] S2: Install the center column

[0064] According to the design drawings, the center column 3 stands 24 meters tall and is composed of seven 3-meter-long and three 1-meter-long steel pipe sections. The steel pipes have an outer diameter of 800 mm, a wall thickness of 16 mm, and are made of Q-235 steel. Each section is connected via flanges using 16 M20.10.9S high-strength bolts. Center column 3 is hoisted using a tower crane and temporarily secured with four guy ropes 4. Double rows of floor-mounted scaffolding are then erected around the column, spaced at 900 mm, 1500 mm, and 900 mm. Starting from the first step, the scaffolding is connected to the center steel pipe with steel pipe fasteners every 1.5 meters. The steel pipe fasteners must be locked to the center steel pipe without any looseness.

[0065] S3: Install the top transfer platform

[0066] The platform is made of 25# I-steel 6, the connecting plate 7 is made of 1.1m×1.1m 16mm thick steel plate, and 114×8 round tube 9. The I-steel 6, connecting plate 7, and φ3.5m round plate 8 are welded and assembled on the ground.

[0067] S4: Install Bailey Rack

[0068] Lift the Bailey beam to the top of the transfer platform. Weld channel steel to the transfer platform on both sides of one end of the Bailey plate to limit the slippage of the Bailey beam. Place the other end in the reserved hole in the warehouse wall. Place the Bailey beams in a centrally symmetrical order. Simultaneously, install the Bailey frame's circumferential channel steel.

[0069] S5: Review

[0070] Check whether all high-strength bolts at the connection points of each component are installed, and randomly check the torque value of the high-strength bolts (not less than 30% between columns, not less than 20% between tie rods and column main pipes), and check the verticality deviation of the conical shell top plate support system.

[0071] As a preferred embodiment, in step S2, the step of installing the central column includes:

[0072] P1: The leveling of the center column foundation should be controlled within ±2mm;

[0073] P2: After the bottom section steel pipe is in place, measure the verticality of the bottom section steel pipe, and the deviation is required to be less than 2mm;

[0074] P3: After the bottom section of steel pipes are installed, the remaining steel pipes are hoisted. After the remaining steel pipes are in place, first measure the verticality. The accuracy requirements are the same as above. After meeting the requirements, tighten the high-strength bolts of the flanges between the steel pipes. The same is divided into initial torque and final torque. The tightening order of the high-strength bolts of each flange is along the diagonal direction, and the flange is tightened along the diagonal direction;

[0075] P4: After tightening the high-strength bolts of the flange, follow the operation method of P3 to tighten the high-strength bolts between each tie rod and the main pipe of the scaffolding;

[0076] P5: Once the installation accuracy is met, the diagonal braces between the columns are connected. The high-strength bolts are installed in the same order and with the same torque values ​​as above. The vertical deviation of the entire center column is less than 40mm. The center column 1 is connected with a segmented flange, combined with a double-row scaffolding column connection and four-way guy rope 4 for fastening. This keeps the overall vertical deviation within 40mm, significantly improving the accuracy compared to traditional processes.

[0077] As a preferred embodiment, in step S3, the step of installing the conversion platform includes:

[0078] T1: Platform Assembly

[0079] On the ground, weld the I-beam 6, the connecting plate 7, and the circular plate 8 to form a conversion platform;

[0080] T2: Platform Installation

[0081] Once the platform is in place, connect it to the lower columns using high-strength bolts. The final torque of the M20.10.9S high-strength bolts must be no less than 720 N-M. A 1-meter-long center column is fabricated, and 16 lugs are welded to the lower connecting plate. The column is then connected to the I-beam using 16 evenly spaced 114×8 round tubes with 9-bolts. The final torque of the bolts is the same as above.

[0082] As a preferred embodiment, in step S4, the assembly sequence of the Bailey beam 2 is as follows: the Bailey plates 12 are assembled on the ground and then hoisted. During hoisting, the Bailey plates 12 should be hoisted in a two-point symmetrical manner to ensure that the Bailey plates 12 are in a horizontal state after hoisting. Then, four Bailey plates 12 in symmetrical directions are installed first. Subsequent installation adopts symmetrical installation, and the hoisting operation area is first divided according to the hoisting procedure. The installation is carried out simultaneously in the divided areas and in an equal order. During the installation process, the principle of symmetrical installation should be followed, that is, the Bailey beams 2 should be installed symmetrically starting from the middle span and extending symmetrically to both ends. The Bailey beam 2 adopts the ground pre-assembly + symmetrical hoisting process, which reduces the amount of high-altitude work and shortens the construction period.

[0083] As a preferred embodiment, in step S4, the number of Bailey beams per silo is 37. Each Bailey beam is composed of one 1.65-meter non-standard Bailey beam, two standard 3-meter Bailey beams, and one 2-meter and one 1.5-meter standard Bailey beam, connected by dedicated pins. Each Bailey beam is 11.15 meters long and arranged every 10° around the silo. The Bailey beams are arranged radially toward the center of the silo. The upper and lower chords of the Bailey beams are connected by 8# circumferential channel steel with 10# U-bolts. The circumferential channel steel spacing is: one 650mm-900mm for the upper chord, and five for the lower chord, enhancing overall stability. The Bailey beams are densely connected circumferentially by 8# channel steel and U-bolts, forming a rigid grid structure. This significantly improves overall lateral stiffness and effectively suppresses non-uniform deformation during concrete pouring.

[0084] refer to Figure 6-7 As shown in the figure, the construction of the cantilever gutter support system includes the following steps:

[0085] E1: Sleeve embedded

[0086] When the silo wall is slipformed to a height of 25.25m, 2*M18*100mm shear bolt sleeves with a spacing of 650mm are embedded outside the silo. The spacing of 10 tripods is 1.2m. A total of 67 sets of bolt sleeves are embedded in the entire silo with an inner diameter of 25m. These are used as bolt supports for the cantilever eaves and the installation of the external protective frame. The sleeves should be cleaned in time after leaving the formwork to make them exposed.

[0087] E2: Installation of external eaves support and external protective frame

[0088] Before dismantling the slipform, the pre-made external tripod 10 is fixed to the embedded sleeve of the warehouse wall using a 10.9-grade 18mm*100mm bolt using a slipform hanger. Then, scaffolding pipes 11 + bamboo springboards are laid on each external tripod to form a circular cantilever frame as a supporting platform for the cantilevered eaves and a pedestrian passage. Three guardrails are installed on the scaffolding pipe uprights at the end, and a dense mesh is hung to form a closed external protection.

[0089] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0090] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0091] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A construction process for a shallow circular silo roof formwork system, comprising: The construction of the conical shell top plate support system is characterized in that the construction process of the conical shell top plate support system includes the following steps: S1: Reserved opening construction When the silo wall is constructed with slipforms to the elevation, multiple reserved holes are evenly distributed along the circumference of the silo wall to serve as one end support point of the Bailey frame. S2: Install the center column After the central column is hoisted to the center of the warehouse, four guy ropes are set up for temporary fixation. Then, double rows of scaffolding are set up around the column. Steel pipe fasteners are used to connect the column to the central steel pipe every 1.5 meters. S3: Installing the top transfer platform Complete the assembly of the transfer platform on the ground, lift the assembled transfer platform to the top of the central column using a crane, and connect it to the central column with bolts through a round tube; S4: Install Bailey Rack Lift the Bailey beam to the top of the transfer platform. Weld channel steel to the transfer platform on both sides of one end of the Bailey plate to limit the slippage of the Bailey beam. Place the other end in the reserved hole in the warehouse wall. Place the Bailey beams in a centrally symmetrical order. Simultaneously, install the Bailey frame's circumferential channel steel. S5: Review Check whether all high-strength bolts at the connection points of each component are installed, spot-check the torque value of the high-strength bolts, and verify the verticality deviation of the conical shell top plate support system.

2. The construction process of a shallow silo roof formwork system according to claim 1 is characterized in that: In step S2, the height of the central column is 24m, and it is assembled from 7 sections of 3m and 3 sections of 1m steel pipes, and each section is connected by 16 high-strength bolts through a flange.

3. The construction process of a shallow silo roof formwork system according to claim 2, characterized in that: In step S2, the steps of installing the central column include: P1: The leveling of the center column foundation should be controlled within ±2mm; P2: After the bottom section steel pipe is in place, measure the verticality of the bottom section steel pipe, and the deviation is required to be less than 2mm; P3: After the bottom section of steel pipes are installed, the remaining steel pipes are hoisted. After the remaining steel pipes are in place, first measure the verticality. The accuracy requirements are the same as above. After meeting the requirements, tighten the high-strength bolts of the flanges between the steel pipes. The same is divided into initial torque and final torque. The tightening order of the high-strength bolts of each flange is along the diagonal direction, and the flange is tightened along the diagonal direction; P4: After tightening the high-strength bolts of the flange, follow the operation method of P3 to tighten the high-strength bolts between each tie rod and the main pipe of the scaffolding; P5: Measure the installation accuracy again. Once it meets the requirements, connect the diagonal tie rods between the columns. The construction sequence and torque values ​​of the high-strength bolts are the same as above. The verticality deviation of the overall center column is less than 40mm.

4. The construction process of a shallow silo roof formwork system according to claim 1, characterized in that: In step S3, the installation step of the conversion platform includes: T1: Platform Assembly On the ground, weld the I-beam, connecting plate and disc to form a transfer platform; T2: Platform Installation After the platform is in place, use high-strength bolts to connect it to the lower center column. The final torque value of the high-strength bolts is not less than 720N-M. Process a 1m long center column and weld 16 ear plates on the lower connecting plate. The column and the I-beam are connected by 16 evenly arranged round tube bolts. The final torque value of the bolts is the same as above.

5. The construction process of a shallow silo roof formwork system according to claim 1 is characterized in that: In step S4, the assembly order of the Bailey beam is as follows: the Bailey plates are assembled on the ground and then hoisted. During hoisting, the Bailey plates should be hoisted in a two-point symmetrical manner to ensure that the Bailey plates are in a horizontal state after hoisting. Then, four Bailey plates in the symmetrical direction are installed first. The subsequent installation adopts symmetrical installation. The hoisting operation area is divided according to the hoisting procedure. The installation is carried out simultaneously in the divided areas and in an equal order. During the installation process, the principle of symmetrical installation should be followed, that is, the Bailey beam should be installed symmetrically starting from the middle span and extending symmetrically to both ends.

6. The construction process of a shallow silo roof formwork system according to claim 1, characterized in that: In step S4, the number of Bailey beams in a single warehouse is 37. A single Bailey beam is connected by a special pin shaft with one 1.65-meter end non-standard Bailey plate, two standard 3-meter Bailey plates, and one 2-meter and one 1.5-meter standard Bailey plates to form a single Bailey beam. The length of a single Bailey beam is 11.15 meters. One beam is arranged every 10° in the circumferential direction. The Bailey beams are arranged in a radial type toward the center of the silo. The upper and lower chords of the Bailey beam are connected by 10# U-bolts through circumferential 8# channel steel. The spacing of the circumferential channel steel is: one 650mm-900mm for the upper chord and a total of 5 for the lower chord to increase overall stability.

7. The construction process of a shallow silo roof formwork system according to claim 1, characterized in that: Also includes: The construction of the cantilever gutter support system includes the following steps: E1: Sleeve embedded When the silo wall is slipformed, when it slides to the preset height, pre-buried shear bolt sleeves with a spacing of 650mm above and below the silo, with a tripod spacing of 1.2m, serve as bolt supports for the cantilever eaves support and the installation of the external protective frame. After the sleeves are out of the formwork, they should be cleaned in time to make them exposed; E2: Installation of external eaves support and external protective frame Before dismantling the slipform, the pre-made external tripod is fixed to the embedded sleeve of the warehouse wall with bolts using the slipform hanger. Then, scaffolding pipes and bamboo springboards are laid on each external tripod to form a circular cantilever frame as a supporting platform for the cantilevered eaves and a pedestrian passage. Three guardrails are installed on the scaffolding pipe uprights at the end, and a dense mesh is hung to form a closed external protection.

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