A precise control method for one-time closing of three-limb special-shaped arch ribs

Abstract

The present invention provides a method for accurately controlling the one-time closing of three-limb special-shaped arch ribs. The method comprises the following steps: calculating the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; correcting the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; and constructing the arch rib segments in stages based on the theoretical calculation and the corrected calculation. After the construction of the arch rib segments is completed, the ambient temperature is measured in real time, and when the ambient temperature T used for the arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction of the three-limb arch ribs. The special-shaped arch ribs can be closed once and the secondary internal force can reach the theoretical optimal state, and the superposition of the secondary internal force caused by the existence of multiple superstatic stress states during the multiple closings can be avoided. The problem in the prior art that the special-shaped arch ribs need to be closed multiple times and the mechanical state of the special-shaped arch ribs after closing is difficult to accurately control is solved.

Description

Technical Field

[0001] The invention belongs to the field of arch structure closing control in the civil engineering industry. Background Art

[0002] In recent years, in pursuit of aesthetics, cost reduction and optimized stress state, many special-shaped arch ribs have emerged in arch-shaped buildings / structures. Special-shaped arch ribs are usually closed in stages, and multiple closings result in multiple statically indeterminate stress states, which in turn leads to the superposition of secondary internal forces, and ultimately makes it difficult to accurately control the mechanical state of the special-shaped arch ribs after closing.

[0003] How to provide a precise control method for the one-time closing of three-legged special-shaped arch ribs, realize single closing, and achieve the theoretically optimal state of secondary internal force has become a technical problem that needs to be further improved and optimized in the construction industry. Summary of the invention

[0004] The present invention aims to invent a method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, so as to solve the problems in the prior art that the special-shaped arch ribs need to be closed multiple times and the mechanical state of the special-shaped arch ribs after closing is difficult to accurately control, so as to achieve one-time closing of the special-shaped arch ribs and achieve the theoretical optimal internal force.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for precisely controlling the one-time closing of three-limb special-shaped arch ribs, comprising:

[0007] Step 1, calculating the theoretical value of the cutting length and installation curve of the three-limb arch rib structure;

[0008] Step 2, correcting the theoretical values ​​of the cutting length and installation curve of the three-limb arch rib structure;

[0009] Step 3, based on theoretical calculation and revised calculation, the arch rib segment is constructed in stages;

[0010] Step 4: After the construction of the arch rib segment is completed, the ambient temperature is measured in real time. When the ambient temperature T used for arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction of the three-legged arch rib.

[0011] Preferably, in the above-mentioned method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, step 1 comprises the following steps:

[0012] Step 11, establish a three-dimensional finite element model of the three-limb arch rib, directly analyze the state of the arch rib after forming in the construction stage, calculate its theoretical pre-camber, and then determine its theoretical optimal spatial position as the design position curve superimposed on the theoretical pre-camber curve as its target closing curve;

[0013] Step 12, determining the three-dimensional spatial position of each limb arch rib after being stressed according to the target closing curve, and then determining the length and linear parameters of the arch rib, wherein the length is recorded as Li, and the linear function is recorded as Yi, i=1, 2, 3, corresponding to each arch rib respectively;

[0014] Step 13, considering the ambient temperature T during the closing period of the arch rib, calculate the temperature deformation of the arch rib affected by the temperature, which is recorded as ΔTLi, ΔTYi; i = 1, 2, 3;

[0015] Step 14, considering the self-weight of the three-legged arch rib, calculate the self-weight deformation of each arch rib affected by its own weight, denoted as ΔGLi, ΔGYi; i = 1, 2, 3;

[0016] Step 15, considering the influence of other associated mechanical components during the closing of the arch rib, calculate other deformations of the arch rib under other associated mechanical components, including ΔOLi, ΔOYi; i = 1, 2, 3;

[0017] Step 16, superimpose ΔGLi, ΔTLi, ΔOLi on the basis of the theoretical length Li as the cutting length of the arch rib, and superimpose ΔGYi, ΔTYi, ΔOYi on the basis of the theoretical linear function Yi as the installation curve of the arch rib.

[0018] Preferably, in the above-mentioned method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, step 2 comprises the following steps:

[0019] Step 21, according to the theoretical calculation of the cutting length, installation curve and theoretical deformation of the arch rib, the cutting length, installation curve and theoretical deformation of each segment inside the arch rib are calculated, and the first segment of the arch rib is constructed; under the same temperature conditions as the theoretical calculation, the deformation of the first segment after construction is measured, and the measurement objects include the actual deformation of the first segment and the deflection angle of the first segment, wherein the actual deformation of the first segment is the top displacement of the first segment;

[0020] Step 22, using the actual deformation A1 of the first segment and the deflection angle B1 of the first segment to calculate the expected deformation of the second segment, the expected deformation of the second segment is A1+sin(B1)*L'2, where L'2 is the blanking length of the second segment;

[0021] Step 23, compare and analyze the actual deformation of the first segment, the expected deformation of the second segment, and the theoretical deformation of the first segment and the theoretical deformation of the second segment in the theoretical calculation analysis, and calculate and obtain two correction indicators x(1) and x(2), wherein x(1)=actual deformation of the first segment / theoretical deformation of the first segment, and x(2)=expected deformation of the second segment / theoretical deformation of the second segment;

[0022] Step 24, using the calculation results of the two correction indicators x(1) and x(2) to correct the blanking length and installation curve of each segment along the arch rib, multiplying the theoretical deformation of the second segment by x(1), multiplying the theoretical deformation of the third segment by x(2), and so on, until the final segment, to obtain the actual spatial position of the final segment;

[0023] Step 25, comparing whether the spatial position of the final segment of the three-legged arch rib meets the spatial position conditions required for closing. If there is a situation where the spatial position conditions required for closing are not met, take measures to adjust the on-site construction until the spatial position conditions required for closing are met.

[0024] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, when the arch rib is long and has many internal segments, new x(i) and x(i+1) values ​​should be established segment by segment to improve the accuracy and effectiveness of the correction, where i is a natural number.

[0025] Preferably, in the above-mentioned method for precise control of one-time closure of three-limb special-shaped arch ribs, in step 15, the other associated mechanical components include under-arch hangers, under-arch supports, lifting measures and / or arch feet.

[0026] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 25, the comparison of the spatial position of the final segment of the three-limb arch rib meets the spatial position conditions required for closing, including whether the center point is centered and whether there is a large deflection at the end.

[0027] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 25, the adjustment of on-site construction measures includes measures to increase the stiffness of the supporting structure or directly adjust the cutting length and installation curve of the unconstructed arch rib segments.

[0028] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 21, when measuring the deformation of the first segment after construction, it should be ensured that the temperature is consistent with the temperature value used in theoretical calculation to eliminate the influence of temperature effect on deformation.

[0029] It can be seen from the technical solutions disclosed above that, compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] The present invention provides a method for accurately controlling the one-time closing of three-limb special-shaped arch ribs. The method comprises the following steps: calculating the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; correcting the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; and constructing the arch rib segments in stages based on the theoretical calculation and the corrected calculation. After the construction of the arch rib segments is completed, the ambient temperature is measured in real time, and when the ambient temperature T used for the arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction of the three-limb arch ribs. The special-shaped arch ribs can be closed once and the secondary internal forces can reach the theoretical optimal state, thereby avoiding the superposition of secondary internal forces due to multiple superstatic stress states during the multiple closings. The problem in the prior art that the special-shaped arch ribs need to be closed multiple times and the mechanical state of the special-shaped arch ribs after closing is difficult to accurately control is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the working state of the supporting device of the integral steel platform.

[0032] In the figure: 1-arch rib one, 2-arch rib two, 3-arch rib three. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical content and features of the present invention will be described in detail below by combining the enumerated embodiments with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0034] See also Figure 1 This embodiment discloses a method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, comprising:

[0035] Step 1, calculating the theoretical value of the cutting length and installation curve of the three-limb arch rib structure, wherein the three-limb arch rib structure includes an arch rib 1, an arch rib 2, and an arch rib 3 that intersect at the top;

[0036] Step 2, correcting the theoretical values ​​of the cutting length and installation curve of the three-limb arch rib structure;

[0037] Step 3, based on theoretical calculation and revised calculation, the arch rib segment is constructed in stages;

[0038] Step 4: After the construction of the arch rib segment is completed, the ambient temperature is measured in real time. When the ambient temperature T used for arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction of the three-legged arch rib.

[0039] The present invention provides a method for accurately controlling the one-time closing of three-limb special-shaped arch ribs. The method comprises the following steps: calculating the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; correcting the theoretical values ​​of the blanking length and the installation curve of the three-limb arch rib structure; and constructing the arch rib segments in stages based on the theoretical calculation and the corrected calculation. After the construction of the arch rib segments is completed, the ambient temperature is measured in real time, and when the ambient temperature T used for the arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction of the three-limb arch ribs. The special-shaped arch ribs can be closed once and the secondary internal forces can reach the theoretical optimal state, thereby avoiding the superposition of secondary internal forces due to multiple superstatic stress states during the multiple closings. The problem in the prior art that the special-shaped arch ribs need to be closed multiple times and the mechanical state of the special-shaped arch ribs after closing is difficult to accurately control is solved.

[0040] Preferably, in the above-mentioned method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, step 1 comprises the following steps:

[0041] Step 11, establish a three-dimensional finite element model of the three-limb arch rib, directly analyze the state of the arch rib after forming in the construction stage, calculate its theoretical pre-camber, and then determine its theoretical optimal spatial position as the design position curve superimposed on the theoretical pre-camber curve as its target closing curve;

[0042] Step 12, determining the three-dimensional spatial position of each limb arch rib after being stressed according to the target closing curve, and then determining the length and linear parameters of the arch rib, wherein the length is recorded as Li, and the linear function is recorded as Yi, i=1, 2, 3, corresponding to each arch rib respectively;

[0043] Step 13, considering the ambient temperature T during the closing period of the arch rib, calculate the temperature deformation of the arch rib affected by the temperature, which is recorded as ΔTLi, ΔTYi; i = 1, 2, 3;

[0044] Step 14, considering the self-weight of the three-legged arch rib, calculate the self-weight deformation of each arch rib affected by its own weight, denoted as ΔGLi, ΔGYi; i = 1, 2, 3;

[0045] Step 15, considering the influence of other associated mechanical components during the closing of the arch rib, calculate other deformations of the arch rib under other associated mechanical components, including ΔOLi, ΔOYi; i = 1, 2, 3;

[0046] Step 16, superimpose ΔGLi, ΔTLi, ΔOLi on the basis of the theoretical length Li as the cutting length of the arch rib, and superimpose ΔGYi, ΔTYi, ΔOYi on the basis of the theoretical linear function Yi as the installation curve of the arch rib.

[0047] When calculating the theoretical values ​​of the cutting length and installation curve of the three-limb arch rib structure, the state of the arch rib after forming is directly analyzed in the construction stage, and its theoretical pre-camber is calculated, and then its theoretical optimal spatial position is determined as the design position curve superimposed on the theoretical pre-camber curve as its target closing curve; the three-dimensional spatial position of each limb arch rib after being stressed is determined according to the target closing curve, and then the length and linear parameters of the arch rib are determined; the temperature deformation of the arch rib affected by temperature is calculated, the self-weight deformation of each arch rib affected by its own weight is calculated, and other deformations of the arch rib under other associated mechanical components are calculated; the above-mentioned temperature deformation, self-weight deformation and other deformations of the arch rib under other associated mechanical components are superimposed on the theoretical length as the cutting length of the arch rib, and the above-mentioned temperature deformation, self-weight deformation and other deformations of the arch rib under other associated mechanical components are superimposed on the theoretical linear function Yi as the installation curve of the arch rib, so that more accurate theoretical values ​​of the cutting length and installation curve of the arch rib can be obtained.

[0048] Preferably, in the above-mentioned method for precise control of one-time closure of three-limb special-shaped arch ribs, in step 15, the other associated mechanical components include under-arch hangers, under-arch supports, lifting measures and / or arch feet.

[0049] Preferably, in the above-mentioned method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, step 2 comprises the following steps:

[0050] Step 21, according to the theoretical calculation of the cutting length, installation curve and theoretical deformation of the arch rib, the cutting length, installation curve and theoretical deformation of each segment inside the arch rib are calculated, and the first segment of the arch rib is constructed; under the same temperature conditions as the theoretical calculation, the deformation of the first segment after construction is measured, and the measurement objects include the actual deformation of the first segment and the deflection angle of the first segment, wherein the actual deformation of the first segment is the top displacement of the first segment;

[0051] Step 22, using the actual deformation A1 of the first segment and the deflection angle B1 of the first segment to calculate the expected deformation of the second segment, the expected deformation of the second segment is A1+sin(B1)*L'2, where L'2 is the blanking length of the second segment;

[0052] Step 23, compare and analyze the actual deformation of the first segment, the expected deformation of the second segment, and the theoretical deformation of the first segment and the theoretical deformation of the second segment in the theoretical calculation analysis, and calculate and obtain two correction indicators x(1) and x(2), wherein x(1)=actual deformation of the first segment / theoretical deformation of the first segment, and x(2)=expected deformation of the second segment / theoretical deformation of the second segment;

[0053] Step 24, using the calculation results of the two correction indicators x(1) and x(2) to correct the blanking length and installation curve of each segment along the arch rib, multiplying the theoretical deformation of the second segment by x(1), multiplying the theoretical deformation of the third segment by x(2), and so on, until the final segment, to obtain the actual spatial position of the final segment;

[0054] Step 25, comparing whether the spatial position of the final segment of the three-legged arch rib meets the spatial position conditions required for closing. If there is a situation where the spatial position conditions required for closing are not met, take measures to adjust the on-site construction until the spatial position conditions required for closing are met.

[0055] When correcting the theoretical values ​​of the cutting length and installation curve of the three-limb arch rib structure, the cutting length, installation curve and theoretical deformation of each segment inside the arch rib are calculated according to the theoretical calculation of the cutting length, installation curve and theoretical deformation of the arch rib, and the construction of the first segment of the arch rib is carried out; under the same temperature conditions as the theoretical calculation, the deformation of the first segment after construction is measured, and the measurement objects include the actual deformation of the first segment and the deflection angle of the first segment. The expected deformation of the second segment is calculated using the actual deformation A1 of the first segment and the deflection angle B1 of the first segment. The expected deformation of the second segment is A1+sin(B1)*L'2; the actual deformation of the first segment, the expected deformation of the second segment, and the theoretical deformation of the first segment and the second segment in the theoretical calculation analysis are compared and analyzed. The theoretical deformation of the segment is calculated to obtain two correction indicators x(1) and x(2), where x(1) = actual deformation of the first segment / theoretical deformation of the first segment, and x(2) = expected deformation of the second segment / theoretical deformation of the second segment. Since the arch rib itself is a curve, the influence of its angle on deformation prediction increases with the increase of the arch rib length. The calculation results of the two correction indicators x(1) and x(2) are used to correct the cutting length and installation curve of each segment along the arch rib. The theoretical deformation of the second segment is multiplied by x(1), the theoretical deformation of the third segment is multiplied by x(2), and so on. In other words, new x(i) and x(i+1) values ​​are established segment by segment, where i is a natural number, until the final segment, and the actual spatial position of the final segment is obtained. This can improve the accuracy and effectiveness of the correction.

[0056] Since the arch rib itself is curved, the influence of its angle on deformation prediction increases with the increase of the arch rib length. Therefore, when the arch rib is long and has many segments, new x(i) and x(i+1) values ​​should be established segment by segment to improve the accuracy and effectiveness of the correction. i is a natural number.

[0057] Since the arch rib itself is curved, the influence of its angle on deformation prediction increases with the increase of the arch rib length. Therefore, when the arch rib is long and has many segments, new x(i) and x(i+1) values ​​should be established for each segment to improve the accuracy and effectiveness of the correction, where i is a natural number.

[0058] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 21, when measuring the deformation of the first segment after construction, it should be ensured that the temperature is consistent with the temperature value used in theoretical calculation to eliminate the influence of temperature effect on deformation.

[0059] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 25, the comparison of the spatial position of the final segment of the three-limb arch rib meets the spatial position conditions required for closing, including whether the center point is centered and whether there is a large deflection at the end.

[0060] Preferably, in the above-mentioned method for precise control of one-time closing of three-limb special-shaped arch ribs, in step 25, the adjustment of on-site construction measures includes measures to increase the stiffness of the supporting structure or directly adjust the cutting length and installation curve of the unconstructed arch rib segments.

[0061] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A method for accurately controlling the one-time closing of three-limb special-shaped arch ribs, characterized in that: include: Step 1, calculating the theoretical value of the cutting length and installation curve of the three-limb arch rib structure; Step 2, correcting the theoretical values ​​of the cutting length and installation curve of the three-limb arch rib structure; Step 3, based on theoretical calculation and revised calculation, the arch rib segment is constructed in stages; Step 4: After the construction of the arch rib segment is completed, the ambient temperature is measured in real time, and when the ambient temperature T used for arch rib calculation is reached, the closing operation is performed to complete the one-time closing and forming construction operation of the three-limb arch rib; The step 1 comprises the following steps: Step 11, establish a three-dimensional finite element model of the three-limb arch rib, directly analyze the state of the arch rib after forming in the construction stage, calculate its theoretical pre-camber, and then determine its theoretical optimal spatial position as the design position curve superimposed on the theoretical pre-camber curve as its target closing curve; Step 12, according to the target closing curve, determine the three-dimensional spatial position of each limb arch rib after being stressed, and then determine the length and linear parameters of the arch rib, where the length is recorded as Li, the linear function is recorded as Yi, i = 1, 2, 3, corresponding to each arch rib; Step 13, considering the ambient temperature T during the closing period of the arch rib, calculate the temperature deformation of the arch rib affected by the temperature, which is recorded as ΔTLi, ΔTYi; i = 1, 2, 3; Step 14, considering the self-weight of the three-legged arch rib, calculate the self-weight deformation of each arch rib affected by its own weight, denoted as ΔGLi, ΔGYi; i = 1, 2, 3; Step 15, considering the influence of other associated mechanical components during the closing of the arch rib, calculate other deformations of the arch rib under other associated mechanical components, including ΔOLi, ΔOYi; i = 1, 2, 3; Step 16, superimpose ΔGLi, ΔTLi, ΔOLi on the basis of the theoretical length Li as the cutting length of the arch rib, and superimpose ΔGYi, ΔTYi, ΔOYi on the basis of the theoretical linear function Yi as the installation curve of the arch rib.

2. The one-time precise control method for closing three-limb special-shaped arch ribs as claimed in claim 1, characterized in that: In step 15, the other associated mechanical components include under-arch hangers, under-arch brackets, lifting measures and / or arch feet.

3. The one-time precise control method for closing three-limb special-shaped arch ribs as claimed in claim 1, characterized in that: The step 2 comprises the following steps: Step 21, according to the theoretical calculation of the cutting length, installation curve and theoretical deformation of the arch rib, the cutting length, installation curve and theoretical deformation of each segment inside the arch rib are calculated, and the first segment of the arch rib is constructed; under the same temperature conditions as the theoretical calculation, the deformation of the first segment after construction is measured, and the measurement objects include the actual deformation of the first segment and the deflection angle of the first segment, wherein the actual deformation of the first segment is the top displacement of the first segment; Step 22, using the actual deformation A1 of the first segment and the deflection angle B1 of the first segment to calculate the expected deformation of the second segment, the expected deformation of the second segment is A1+sin(B1)*L'2, where L'2 is the blanking length of the second segment; Step 23, compare and analyze the actual deformation of the first segment, the expected deformation of the second segment, and the theoretical deformation of the first segment and the theoretical deformation of the second segment in the theoretical calculation analysis, and calculate and obtain two correction indicators x(1) and x(2), wherein x(1)=actual deformation of the first segment / theoretical deformation of the first segment, and x(2)=expected deformation of the second segment / theoretical deformation of the second segment; Step 24, using the calculation results of the two correction indicators x(1) and x(2) to correct the blanking length and installation curve of each segment along the arch rib, multiplying the theoretical deformation of the second segment by x(1), multiplying the theoretical deformation of the third segment by x(2), and so on, until the final segment, to obtain the actual spatial position of the final segment; Step 25, comparing whether the spatial position of the final segment of the three-legged arch rib meets the spatial position conditions required for closing. If there is a situation where the spatial position conditions required for closing are not met, take measures to adjust the on-site construction until the spatial position conditions required for closing are met.

4. The one-time precise control method for closing three-limb special-shaped arch ribs as claimed in claim 3 is characterized in that: In step 25, the comparison of the spatial position of the final segment of the three-limbed arch rib to see whether it meets the spatial position conditions required for closing includes whether the center point is centered and whether there is a large deflection at the end.

5. The one-time precise control method for closing three-limb special-shaped arch ribs as claimed in claim 3, characterized in that: In step 25, the on-site construction measures are adjusted, including measures to increase the rigidity of the supporting structure or directly adjusting the cutting length and installation curve of the unconstructed arch rib segments.

6. The one-time precise control method for closing three-limb special-shaped arch ribs as claimed in claim 3, characterized in that: In step 21, when measuring the deformation after the construction of the first section, it should be ensured that the temperature is consistent with the temperature value used in the theoretical calculation to eliminate the influence of temperature effect on the deformation.

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