Silo top construction platform and safety verification method and deflection control method thereof

Abstract

The invention discloses a silo top construction platform and a safety verification method and deflection control method thereof.The platform comprises a center stand column vertically arranged in a silo along the center of the ground of the silo and a steel truss platform on the center stand column, and the center stand column sequentially comprises a hydraulic oil cylinder, a plurality of standard sections and a bracket from bottom to top; the hydraulic oil cylinder is fixedly arranged on the ground of the silo, the steel truss platform comprises a plurality of longitudinal main beams distributed in a radial mode, the longitudinal main beams are arranged between a bracket of a central stand column and a silo body of the silo, the inner ring beam is arranged on the bracket in a surrounding mode, and the outer ring beams are arranged on the longitudinal main beams in a surrounding mode. When deflection deformation occurs, the structural safety of the silo top construction platform can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a silo roof construction platform and its safety verification method and deflection control method. Background Technology

[0002] In silo roof construction, a silo roof construction platform, consisting of a central column and a steel truss platform, is commonly used. The steel truss platform comprises multiple longitudinal beams radially distributed along the central column and multiple ring beams above them. Since the silo roof construction platform primarily bears the load of the circular formwork and the concrete pouring, the circular formwork and the steel truss platform are prone to deflection deformation during concrete pouring due to the volume of concrete poured, thus affecting the pouring quality and construction safety. To avoid the impact of deflection deformation during later concrete pouring on silo roof construction safety, structural safety verification of the silo roof construction platform is necessary to determine whether it meets the requirements for deflection deformation caused by the concrete pouring load. A commonly used method for safety verification is to calculate the stress and radial bending moment of the silo roof construction platform by analyzing the mechanical properties of the circular formwork using finite element analysis software. The structural safety of the silo roof construction platform is then confirmed through these stress and radial bending moment measurements. Its disadvantage is that the finite element calculation process is cumbersome and not conducive to rapid evaluation and design optimization. Summary of the Invention

[0003] The purpose of this invention is to provide a silo roof construction platform and its safety verification method and deflection control method, so as to solve the problems of how to ensure structural safety when deflection deformation occurs before and after concrete pouring and how to verify whether the structure of the silo roof construction platform is safe.

[0004] To address the aforementioned technical problems, this invention provides a silo roof construction platform, comprising a central column vertically installed within the silo along the center of the silo ground and a steel truss platform thereon. The central column, from bottom to top, comprises a hydraulic cylinder, multiple standard sections, and a bracket. The hydraulic cylinder is fixedly installed on the silo ground. The steel truss platform includes multiple longitudinal main beams arranged radially, positioned between the bracket of the central column and the silo body, as well as an inner ring beam surrounding the bracket and multiple outer ring beams surrounding the longitudinal main beams.

[0005] To address the aforementioned technical problems, this invention also provides a safety verification method for a silo roof construction platform. The silo roof construction platform is treated as a circular thin plate for mechanical performance analysis. According to the theory of circular thin plates, the radial bending moment at the center of the circular thin plate is approximately equal to the radial bending moment at the periphery of the inner ring beam. The radial bending moment at any cross-section of the circular thin plate is calculated using formula (1) of the circular thin plate theory.

[0006]

[0007] When k = 0, substituting into formula (1) yields formula (2). The radial bending moment at the center of the circular thin plate is calculated using formula (2) and used as the radial bending moment around the inner ring beam of the silo top construction platform:

[0008]

[0009] In equations (1) and (2), M k M0 is the radial bending moment at any point between the center and the edge of the circular thin plate, and M0 is the radial bending moment at the center of the circular thin plate. ri Let q1 be the radial bending moment around the inner ring beam of the silo top construction platform, v be the weight of the steel truss platform, R be the radius of the circular thin plate (equal to the radius of the steel truss platform), and k be any position between the center and the edge of the circular thin plate.

[0010] Calculate the radial pressure at the inner ring beam of the steel truss platform according to formula (3):

[0011]

[0012] In equation (3), N ri M represents the radial pressure on the steel truss platform. ri t is the radial bending moment around the inner ring beam of the construction platform on the top of the silo, and t is the thickness of the steel truss platform.

[0013] The critical radial pressure value per unit length of the inner ring beam is calculated according to formula (4):

[0014]

[0015] In equation (4), N cr Let E be the critical radial pressure value per unit length of the inner ring beam, and E be the elastic modulus of the inner ring beam. y Let r be the moment of inertia of the inner ring beam section, and r be the radius of the inner ring beam.

[0016] N ri With N cr Comparison, when N ri <N cr If the structure of the inner ring beam of the construction platform on the top of the silo is deemed safe, it is considered unsafe.

[0017] Furthermore, the safety verification method for the silo roof construction platform provided by this invention...

[0018] Calculate the bending moment and shear force of the longitudinal main beam of the silo roof construction platform at any cross section according to formulas (5) and (6):

[0019]

[0020] In equations (5) and (6), M1 is the bending moment of the longitudinal main beam at any section, V is the shear force of the longitudinal main beam at any section, and q A The load intensity q is the left end load of the trapezoidal load distributed across a single longitudinal main beam. B The load intensity at the right end of the trapezoidal load is distributed as a single longitudinal main beam. L = Rr, where R is the span of the longitudinal main beam, r is the radius of the construction platform on the top of the silo, r is the radius of the inner ring beam, and X is the distance from the end of the longitudinal main beam closest to the silo to any position on the inner ring beam.

[0021] When M1 max ≤[M],V max When M1 ≤ [V], the structural strength of the longitudinal main beam of the silo roof construction platform is considered safe; otherwise, it is considered unsafe. max V represents the maximum bending moment of the longitudinal main beam. max [M] represents the maximum shear force of the longitudinal main beam, [V] represents the allowable bending moment, and [V] represents the allowable shear force.

[0022] Furthermore, the safety verification method for the silo roof construction platform provided by this invention...

[0023] Calculate the mid-span deflection of the longitudinal main beam of the steel truss platform according to formula (7):

[0024]

[0025] In equation (7), f is the mid-span deflection of the longitudinal main beam, and q A The load intensity q is the left end load of the trapezoidal load distributed across a single longitudinal main beam. B Let L = Rr, where L is the span of the longitudinal main beam, R is the radius of the construction platform on the top of the silo, r is the radius of the inner ring beam, E0 is the elastic modulus of the longitudinal main beam, and I is the moment of inertia of the longitudinal main beam at the cross section.

[0026] When f ≤ [f], the structural stiffness of the longitudinal main beam of the silo roof construction platform is considered safe; otherwise, it is considered unsafe. Here, [f] represents the allowable deflection.

[0027] To address the aforementioned technical problems, this invention provides a method for controlling the deflection of a silo roof construction platform.

[0028] During the initial installation of the silo roof construction platform and the concrete pouring process, the central column provides reaction support to the steel truss platform, passively offsetting the downward deflection deformation of the steel truss platform.

[0029] During the initial installation of the silo top construction platform, the deflection value of the steel truss platform is calculated using formula (8) to adjust the lifting force of the hydraulic cylinder on the steel truss platform, thereby actively compensating for the deflection deformation of the steel truss platform.

[0030]

[0031] In equation (8), w is the deflection of the steel truss platform, q1 is the weight of the steel truss platform, R is the radius of the steel truss platform, r is the radius of the inner ring beam, v is Poisson's ratio, and D is the bending stiffness of the steel truss platform.

[0032] During the concrete pouring process, displacement sensors installed on the construction platform on the top of the silo monitor the displacement data of the steel truss platform in real time as deflection deformation data, and adjust the lifting force of the hydraulic cylinder on the steel truss platform to actively compensate for the deflection deformation of the steel truss platform.

[0033] Furthermore, the deflection control method for the silo roof construction platform provided by the present invention calculates the bending stiffness of the steel truss platform according to formula (8):

[0034]

[0035] In equation (9), D is the bending stiffness of the steel truss platform, E is the elastic modulus of the inner ring beam, t is the thickness of the steel truss platform, and v is Poisson's ratio.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] The silo roof construction platform and its deflection control method provided by this invention adjust the lifting force of the hydraulic cylinder on the steel truss platform by calculating the deflection value of the steel truss platform, and actively compensate for the deflection deformation generated during the initial installation of the steel truss platform; by using displacement sensors to monitor the displacement data of the steel truss platform in real time as deflection deformation data to adjust the lifting force of the hydraulic cylinder on the steel truss platform, actively compensate for the deflection deformation of the steel truss platform, thereby controlling the deflection of the silo roof construction platform before and after the concrete pouring of the silo roof, ensuring the structural safety of the silo roof construction platform, and thus ensuring the quality of the silo roof concrete pouring construction.

[0038] The silo roof construction platform and its safety verification method provided by this invention determine the structural safety of the inner ring beam of the silo roof construction platform by comparing the radial pressure at the inner ring beam of the steel truss platform with the critical radial pressure value per unit length of the inner ring beam; and by calculating the bending moment and shear force of the longitudinal main beam of the silo roof construction platform at any cross-section, and verifying whether the maximum bending moment and maximum shear force of the longitudinal main beam satisfy M. max ≤[M],V max The structural strength of the longitudinal main beam of the silo roof construction platform is determined by the condition f ≤ [V]. The structural stiffness of the longitudinal main beam is determined by whether the mid-span deflection of the longitudinal main beam satisfies the condition f ≤ [f]. Verifying the structural safety of the inner ring beam and longitudinal main beam of the silo roof construction platform allows for rapid safety assessment and design optimization. The radial pressure of the steel truss platform, the bending moment and shear force of the longitudinal main beam at any section are calculated using formulas, which offers advantages over finite element software analysis in terms of convenient calculation, quick output, and simple solution process. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the elevation structure of the construction platform on the top of the silo;

[0040] Figure 2 This is a schematic diagram of the plan structure of the construction platform on the top of the silo;

[0041] Figure 3 This is a structural schematic diagram showing the stress state of the longitudinal main beam;

[0042] Figure 4 This is a schematic diagram of the radial pressure distribution of the ring-pressure beam;

[0043] As shown in the figure:

[0044] 100. Silo roof construction platform; 110. Central column; 111. Hydraulic cylinder; 112. Standard section; 113. Bracket; 120. Steel truss platform; 121. Longitudinal main beam; 122. Inner ring beam; 123. Outer ring beam; 130. Steel bracket; 140. Scaffolding; 150. Silo body. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0046] Example 1

[0047] Please refer to Figures 1 to 2This invention provides a silo roof construction platform 100, including a central column 110 vertically arranged inside the silo along the center of the silo ground and a steel truss platform 120 on it. The central column 110 includes, from bottom to top, a hydraulic cylinder 111, multiple standard sections 112, and a bracket 113. The hydraulic cylinder 111 is fixedly arranged on the ground of the silo. The steel truss platform 120 includes multiple longitudinal main beams 121 arranged radially. The longitudinal main beams 121 are arranged between the bracket 113 of the central column 110 and the silo body 150, as well as an inner ring beam 122 arranged around the bracket 113 and multiple outer ring beams 123 arranged around the longitudinal main beams 121.

[0048] Please refer to this carefully. Figure 3 This invention also provides a safety verification method for a silo roof construction platform 100, comprising:

[0049] Step S201: The mechanical properties of the silo roof construction platform are analyzed as a circular thin plate. According to the theory of circular thin plates, the radial bending moment at the center of the circular thin plate is approximately equal to the radial bending moment at the periphery of the inner ring beam. The radial bending moment of the circular thin plate at any cross-section is calculated according to the formula (1) of the circular thin plate theory:

[0050]

[0051] When k = 0, substituting into formula (1) yields formula (2). The radial bending moment at the center of the circular thin plate is calculated using formula (2) and used as the radial bending moment around the inner ring beam of the silo top construction platform:

[0052]

[0053] In equations (1) and (2), M k M0 is the radial bending moment at any point between the center and the edge of the circular thin plate, and M0 is the radial bending moment at the center of the circular thin plate. ri Let q1 be the radial bending moment around the inner ring beam of the silo top construction platform, v be the weight of the steel truss platform, R be the radius of the circular thin plate (equal to the radius of the steel truss platform), and k be any position between the center and the edge of the circular thin plate.

[0054] Step S202, calculate the radial pressure at the inner ring beam of the steel truss platform 120 according to formula (3):

[0055]

[0056] In equation (3), N ri M represents the radial pressure on the steel truss platform. rit represents the radial bending moment around the inner ring beam of the silo roof construction platform, and t represents the thickness of the steel truss platform.

[0057] Step S203: Calculate the critical radial pressure value of the inner ring beam 122 per unit length according to formula (4):

[0058]

[0059] In equation (4), N cr Let E be the critical radial pressure value per unit length of the inner ring beam 122, and let E be the elastic modulus of the inner ring beam 122. y Let r be the moment of inertia of the inner ring beam 122 section, and r be the radius of the inner ring beam 122.

[0060] Step S204, N ri With N cr Comparison, when N ri <N cr If the structure of the inner ring beam 122 of the silo top construction platform 100 is deemed safe, it is deemed unsafe otherwise.

[0061] Since the steel truss platform 120 is a circular structure and the longitudinal main beams 121 are symmetrically distributed, there is no horizontal displacement or rotation at the section along the axis of symmetry, only vertical displacement, and the shear force is 0. Therefore, the inner ring beam 122 is subjected to symmetrical horizontal forces. The stress on the inner ring beam 122 can be simplified as a ring-compression beam, which is prone to instability. Therefore, the structural safety of the inner ring beam 122 needs to be checked. The radial bending moment at the center of the circular thin plate can be quickly calculated using formula (2) to replace the radial bending moment around the inner ring beam of the silo top construction platform. Thus, the radial pressure at the inner ring beam of the steel truss platform 120 can be quickly calculated using formula (3). It should be noted that the inner ring beam refers to the edge position of the inner ring beam. Since the edge of the inner ring beam is round, the radial pressure at each node position of the inner ring beam edge is the same, such as Figure 3 As shown.

[0062] Please refer to this carefully. Figure 4 The safety verification method for the silo roof construction platform 100 provided in this embodiment of the invention may further include:

[0063] Step S205: Calculate the bending moment and shear force of the longitudinal main beam 121 of the silo roof construction platform 100 at any cross section according to formulas (5) and (6):

[0064]

[0065]

[0066] In equations (5) and (6), M1 is the bending moment of the longitudinal main beam 121 at any section, V is the shear force of the longitudinal main beam 121 at any section, and q A The load intensity at the left end of the trapezoidal load, q, is 121, which is distributed as a single longitudinal main beam. B Let L = Rr, where L is the span of the longitudinal main beam 121, R is the radius of the silo top construction platform 100, r is the radius of the inner ring beam 122, and X is the distance from the end of the longitudinal main beam 121 near the silo to any position on the inner ring beam 122.

[0067] Step S206, when M1 max ≤[M],V max When M1 ≤ [V], the structural strength of the longitudinal main beam 121 of the silo roof construction platform 100 is deemed safe; otherwise, it is deemed unsafe. max V represents the maximum bending moment of the longitudinal main beam 121. max [M] represents the maximum shear force of the longitudinal main beam 121, [V] represents the allowable bending moment, and [M] represents the allowable shear force.

[0068] Please refer to this carefully. Figure 4 The safety verification method for the silo roof construction platform 100 provided in this embodiment of the invention may further include:

[0069] Step S207: Calculate the mid-span deflection of the longitudinal main beam 121 of the steel truss platform 120 according to formula (7):

[0070]

[0071] In equation (7), f is the mid-span deflection of the longitudinal main beam 121, and q A The load intensity at the left end of the trapezoidal load, q, is 121, which is distributed as a single longitudinal main beam. B The load distributed across the single longitudinal main beam 121 is a trapezoidal load with the right-end load intensity q. L = Rr, where L is the span of the longitudinal main beam 121, R is the radius of the silo roof construction platform 100, r is the radius of the inner ring beam 122, E0 is the elastic modulus of the longitudinal main beam 121, and I is the moment of inertia of the longitudinal main beam 121 at its cross-section. The load distributed across the single longitudinal main beam 121 is a trapezoidal load, with the left-end load intensity q... A =θ q R The load intensity q at the right end B =θqr, where θ is the angle between the two longitudinal main beams 121.

[0072] Step S208: When f≤[f], determine that the structural stiffness of the longitudinal main beam 121 of the silo top construction platform 100 is safe; otherwise, it is unsafe. Here, [f] is the allowable deflection.

[0073] The allowable bending moment, allowable shear force, and allowable deflection are the values ​​specified in the "Technical Specification for Steel Silos".

[0074] The silo roof construction platform 100 and its safety verification method provided in Embodiment 1 of the present invention determine the structural safety of the inner ring beam 122 of the silo roof construction platform 100 by comparing the radial pressure at the inner ring beam 122 of the steel truss platform 120 with the critical radial pressure value per unit length of the inner ring beam 122; and determine the structural safety of the longitudinal main beam 121 of the silo roof construction platform 100 by calculating the bending moment and shear force at any section by checking whether the maximum bending moment and maximum shear force of the longitudinal main beam 121 satisfy M. max ≤[M],V max The structural strength of the longitudinal main beam 121 of the silo roof construction platform 100 is determined by the condition f ≤ [V]. The structural stiffness of the longitudinal main beam 121 is determined by whether the mid-span deflection value of the longitudinal main beam 121 satisfies the condition f ≤ [f]. By verifying the structural safety of the inner ring beam 122 and the longitudinal main beam 121 of the silo roof construction platform 100, the safety of the silo roof construction platform 100 can be quickly assessed and its design optimized. The radial pressure of the steel truss platform 120, and the bending moment and shear force of the longitudinal main beam 121 at any section are calculated using formulas. Compared with finite element software analysis, this method has the advantages of convenient calculation, fast output results, and simple solution process.

[0075] Example 2

[0076] Please refer to Figure 1 This invention also provides a method for controlling the deflection of a silo roof construction platform 100, comprising:

[0077] In step S301, during the initial installation of the silo roof construction platform 100 and during the concrete pouring process, the central column 110 provides reaction force support to the steel truss platform 120, passively offsetting the downward deflection deformation of the steel truss platform 120.

[0078] Step S302: During the initial installation of the silo top construction platform 100, the deflection value of the steel truss platform 120 is calculated by formula (8) to adjust the lifting force of the hydraulic cylinder 111 on the steel truss platform 120, thereby actively compensating for the deflection deformation of the steel truss platform 120.

[0079]

[0080] In equation (8), w is the deflection of the steel truss platform 120, q1 is the weight of the steel truss platform 120, R is the radius of the steel truss platform 120, r is the radius of the inner ring beam 110, v is Poisson's ratio, which can be taken as 0.3, and D is the bending stiffness of the steel truss platform 120.

[0081] In step S303, during the concrete pouring process, the displacement data of the steel truss platform 120 is monitored in real time by the displacement sensor installed on the construction platform 100 on the top of the silo as deflection deformation data. This data is used to adjust the lifting force of the hydraulic cylinder 111 on the steel truss platform 120, thereby actively compensating for the deflection deformation of the steel truss platform 120.

[0082] The lifting force of the hydraulic cylinder 111 can be detected by a pressure sensor.

[0083] The deflection control method for the silo roof construction platform 100 provided in this embodiment of the invention calculates the bending stiffness of the steel truss platform 120 according to formula (9):

[0084]

[0085] In equation (9), D is the bending stiffness of the steel truss platform 120, E is the elastic modulus of the inner ring beam 122, t is the thickness of the steel truss platform 120, and v is Poisson's ratio.

[0086] The silo roof construction platform 100 and its deflection control method provided in Embodiment 2 of the present invention adjust the lifting force of the hydraulic cylinder 111 on the steel truss platform 120 by calculating the deflection value of the steel truss platform 120, thereby actively compensating for the deflection deformation generated during the initial installation of the steel truss platform 120; and adjust the lifting force of the hydraulic cylinder 111 on the steel truss platform 120 by using displacement sensor to monitor the displacement data of the steel truss platform 120 in real time as deflection deformation data, thereby actively compensating for the deflection deformation of the steel truss platform 120. In this way, the deflection of the silo roof construction platform 100 is controlled before and after the concrete pouring of the silo roof, ensuring the structural safety of the silo roof construction platform 100, and thus ensuring the quality of the silo roof concrete pouring construction.

[0087] This invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this invention are within the scope of protection of this invention. Those skilled in the art can make other modifications and variations to this invention. Therefore, if these modifications and variations of this invention fall within the scope of the claims of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A silo roof construction platform, characterized in that, The system includes a central column vertically installed inside the silo along the center of the silo floor and a steel truss platform on top of it. The central column, from bottom to top, includes a hydraulic cylinder, multiple standard sections, and a bracket. The hydraulic cylinder is fixedly installed on the silo floor. The steel truss platform includes multiple longitudinal main beams arranged radially. The longitudinal main beams are located between the bracket of the central column and the silo body, as well as an inner ring beam surrounding the bracket and multiple outer ring beams surrounding the longitudinal main beams.

2. A safety verification method for a silo roof construction platform according to claim 1, characterized in that, The mechanical properties of the silo roof construction platform are analyzed as a circular thin plate. According to the theory of circular thin plates, the radial bending moment at the center of the circular thin plate is approximately equal to the radial bending moment at the periphery of the inner ring beam. The radial bending moment of the circular thin plate at any cross-section is calculated according to the formula (1) of the circular thin plate theory: When k = 0, substituting into formula (1) yields formula (2). The radial bending moment at the center of the circular thin plate is calculated using formula (2) and used as the radial bending moment around the inner ring beam of the silo top construction platform: In equations (1) and (2), M k M0 is the radial bending moment at any point between the center and the edge of the circular thin plate, and M0 is the radial bending moment at the center of the circular thin plate. ri Let q1 be the radial bending moment around the inner ring beam of the silo top construction platform, v be the weight of the steel truss platform, R be the radius of the circular thin plate (equal to the radius of the steel truss platform), and k be any position between the center and the edge of the circular thin plate. Calculate the radial pressure at the inner ring beam of the steel truss platform according to formula (3): In equation (3), N ri M represents the radial pressure at the inner ring beam of the steel truss platform. ri t is the radial bending moment around the inner ring beam of the construction platform on the top of the silo, and t is the thickness of the steel truss platform. The critical radial pressure value per unit length of the inner ring beam is calculated according to formula (4): In equation (4), N cr Let E be the critical radial pressure value per unit length of the inner ring beam, and E be the elastic modulus of the inner ring beam. y Let r be the moment of inertia of the inner ring beam section, and r be the radius of the inner ring beam. N ri With N cr Comparison, when N ri <N cr If the structure of the inner ring beam of the construction platform on the top of the silo is deemed safe, it is considered unsafe.

3. The safety verification method for the silo roof construction platform according to claim 2, characterized in that, Calculate the bending moment and shear force of the longitudinal main beam of the silo roof construction platform at any cross section according to formulas (5) and (6): In equations (5) and (6), M1 is the bending moment of the longitudinal main beam at any section, V is the shear force of the longitudinal main beam at any section, and q A The load intensity q is the left end load of the trapezoidal load distributed across a single longitudinal main beam. B The load intensity at the right end of the trapezoidal load is distributed as a single longitudinal main beam. L = Rr, where R is the span of the longitudinal main beam, r is the radius of the construction platform on the top of the silo, r is the radius of the inner ring beam, and X is the distance from the end of the longitudinal main beam closest to the silo to any position on the inner ring beam. When M1 max ≤[M],V1 max When M1 ≤ [V], the structural strength of the longitudinal main beam of the silo roof construction platform is considered safe; otherwise, it is considered unsafe. max V1 represents the maximum bending moment of the longitudinal main beam. max [M] represents the maximum shear force of the longitudinal main beam, [V] represents the allowable bending moment, and [V] represents the allowable shear force.

4. The safety verification method for the silo roof construction platform according to claim 2 or 3, characterized in that, Calculate the mid-span deflection of the longitudinal main beam of the steel truss platform according to formula (7): In equation (7), f is the mid-span deflection of the longitudinal main beam, and q A The load intensity q is the left end load of the trapezoidal load distributed across a single longitudinal main beam. B Let L = Rr, where L is the span of the longitudinal main beam, R is the radius of the construction platform on the top of the silo, r is the radius of the inner ring beam, E0 is the elastic modulus of the longitudinal main beam, and I is the moment of inertia of the longitudinal main beam at the cross section. When f ≤ [f], the structural stiffness of the longitudinal main beam of the silo roof construction platform is considered safe; otherwise, it is considered unsafe. Here, [f] represents the allowable deflection.

5. A method for controlling the deflection of a silo roof construction platform according to claim 1, characterized in that, During the initial installation of the silo roof construction platform and the concrete pouring process, the central column provides reaction support to the steel truss platform, passively offsetting the downward deflection deformation of the steel truss platform. During the initial installation of the silo top construction platform, the deflection value of the steel truss platform is calculated using formula (8) to adjust the lifting force of the hydraulic cylinder on the steel truss platform, thereby actively compensating for the deflection deformation of the steel truss platform. In equation (8), w is the deflection of the steel truss platform, q1 is the weight of the steel truss platform, R is the radius of the steel truss platform, r is the radius of the inner ring beam, v is Poisson's ratio, and D is the bending stiffness of the steel truss platform. During the concrete pouring process, displacement sensors installed on the construction platform on the top of the silo monitor the displacement data of the steel truss platform in real time as deflection deformation data, and adjust the lifting force of the hydraulic cylinder on the steel truss platform to actively compensate for the deflection deformation of the steel truss platform.

6. The deflection control method for the silo roof construction platform according to claim 5, characterized in that, The bending stiffness of the steel truss platform is calculated according to formula (9): In equation (9), D is the bending stiffness of the steel truss platform, E is the elastic modulus of the inner ring beam, t is the thickness of the steel truss platform, and v is Poisson's ratio.

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