CN113863374B - Method for adjusting hoisting deformation to realize assembly of top plate and side wall of assembly type station - Google Patents
Method for adjusting hoisting deformation to realize assembly of top plate and side wall of assembly type station Download PDFInfo
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- CN113863374B CN113863374B CN202111300187.3A CN202111300187A CN113863374B CN 113863374 B CN113863374 B CN 113863374B CN 202111300187 A CN202111300187 A CN 202111300187A CN 113863374 B CN113863374 B CN 113863374B
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 18
- 230000001052 transient effect Effects 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 26
- 239000000725 suspension Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 9
- 230000005489 elastic deformation Effects 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a method for realizing assembly of a top plate and a side wall of an assembly type station by adjusting hoisting deformation, which is characterized by comprising the following steps of: establishing a top plate-sling finite element coupling model based on a finite element model analysis method; solving the finite unit coupling model of the top plate and the sling through transient dynamics to obtain the corresponding relation between the lifting deformation of the top plate and the cable force distribution value of the sling; in the assembling process, the hoisting deformation of the top plate is changed by adjusting the cable force distribution value of the sling, so that the relative distance of the central points of the mortises at the two ends of the bottom of the top plate meets the existing deviation of the side walls, and the assembling between the top plate and the side walls is ensured to be successfully completed in place.
Description
Technical Field
The invention relates to an assembly method of a top plate and a side wall of an assembly type subway station, in particular to a method for adjusting lifting deformation to realize assembly of the top plate and the side wall of the assembly type subway station.
Background
At present, the number of engineering of the assembly type subway station is small, a system and a comprehensive construction technology are not formed, and in the construction of the assembly type subway station, the assembly precision is an important factor influencing the engineering quality. According to the existing engineering case, as shown in fig. 2, the assembling sequence of the main structure of the station is generally bottom plate 5-side wall 4-upright post 3-middle plate 2-top plate 1, and in the assembling process of the bottom plate 5, the side wall 4, the upright post 3 and the middle plate 2, a corresponding adjusting device can be designed for a specific component, so that the structural deviation can be effectively adjusted; however, when the station roof 1 is hoisted, the other structures are in place, so that basically no adjustment allowance exists. Meanwhile, due to the influence of factors such as construction process, component manufacturing errors and measuring errors, the design position of the top plate is difficult to be consistent with that of the side wall before the top plate is assembled in place, the situation that the mortises of the top plate and the side wall cannot be aligned in place in the hoisting process is often caused, and the construction progress is greatly influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for realizing the assembly of the top plate and the side wall of the assembly type station by adjusting the hoisting deformation.
The invention adopts the following technical scheme for solving the technical problems:
the method for adjusting the hoisting deformation to realize the assembly of the top plate and the side wall of the assembled station is characterized by comprising the following steps: establishing a top plate-sling finite element coupling model based on a finite element model analysis method; solving the finite unit coupling model of the top plate and the sling through transient dynamics to obtain the corresponding relation between the lifting deformation of the top plate and the cable force distribution value of the sling; in the assembling process, the hoisting deformation of the top plate is changed by adjusting the cable force distribution value of the sling, so that the relative distance of the central points of the mortises at the two ends of the bottom of the top plate meets the existing deviation of the side walls, and the assembling between the top plate and the side walls is ensured to be successfully completed in place.
The method for adjusting the hoisting deformation to realize the assembly of the top plate and the side wall of the assembled station is also characterized in that:
in the top plate-sling limited unit coupling model, the number of slings is set to be n, wherein n is not less than 4;
marking the centers of the mortises at two ends of the bottom of the top plate as an end point A and an end point B respectively; the relative distance between the end point A and the end point B under different sling cable force distribution working conditions is obtained by calculation according to the following steps:
step 4, load boundary processing
And combining the load boundary with the displacement boundary, and adjusting the distribution value of the cable force of each sling to be consistent with the set distribution value of the cable force of the sling, thereby obtaining the deformation of the top plate under the state of the set distribution value of the sling, so as to meet the requirement of side wall assembly deviation during the assembly of the top plate.
The method for adjusting the hoisting deformation to realize the assembly of the top plate and the side wall of the assembled station is also characterized in that in the step 2:
the unit definition is that the sling is set as a rod unit with tensile rigidity only, and the top plate is set as a hexahedral solid unit based on the arch structure of the top plate;
the material selection is selected according to deformation conditions, the top plate in a hoisting state meets the assumption of small deformation of material mechanics, the material is set as an elastic constitutive structure, and only the elastic modulus, the Poisson ratio and the density are considered;
the grid division is selected as mapping division so as to improve the calculation precision.
The method for realizing the assembly of the top plate and the side wall of the assembled station by adjusting the hoisting deformation is also characterized in that: in the transient dynamics calculation, model inertia force is considered, corresponding top plate speed and top plate acceleration exist in the top plate structure along with time change in the calculation process, actual hoisting is carried out in the stable state of top plate hoisting, and the top plate speed and the top plate acceleration are set to be 0 value; in order to obtain a stable top plate suspension state, the speed and the acceleration of the damping dissipation top plate are set, and a sufficient time length T is set to obtain a stable hoisting state of the top plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts multipoint hoisting for the top plate, changes the relative distance of the mortises on the two sides of the top plate by adjusting the cable force distribution value of the sling, and further adapts to the existing deviation of the side walls, so that the assembly can be smoothly completed in place.
2. The calculation mode based on ANSYS transient dynamics meets the coupling relation between the top plate and the sling, accurate adjustment can be realized, and the process is efficient and quick.
Drawings
FIG. 1 is a schematic diagram of a method for hoisting a top plate according to the present invention;
FIG. 2 is a schematic view of an assembly structure of an assembly station according to the present invention
Reference numbers in the figures: 1, a top plate, 2 a middle plate, 3 upright columns, 4 side walls and 5 a bottom plate;
Detailed Description
Fig. 2 is a schematic view of an assembly structure of the assembly station of the present invention, and the assembly sequence of the structure of the assembly tool is that a bottom plate 5, side walls 4, upright posts 3, a middle plate 2 are arranged, and finally a top plate 1 is assembled on the side walls at both sides by using mortises and tenons.
The method for adjusting the hoisting deformation to assemble the top plate and the side wall of the assembly station in the embodiment comprises the following steps: establishing a top plate-sling finite element coupling model based on a finite element model analysis method; solving the finite element coupling model of the top plate and the sling through transient dynamics to obtain the corresponding relation between the lifting deformation of the top plate and the cable force distribution value of the sling; in the assembling process, the hoisting deformation of the top plate is changed by adjusting the cable force distribution value of the sling, so that the relative distance of the central points of the mortises at the two ends of the bottom of the top plate meets the existing deviation of the side walls, and the assembling between the top plate and the side walls is ensured to be successfully completed in place.
In the embodiment shown in fig. 1, n is set as the number of suspension cables in the top plate-suspension cable finite element coupling model, where n is not less than 4;
the slings from one end to the other end in the top plate 1 are sequentially marked as slings S1, slings S2 and …, sling Sn-1 and sling Sn; the upper end points of the slings are control points which are recorded as control points K1, control points K2 and …, control points Kn-1 and control points Kn in a one-to-one correspondence manner; the lower end points of the suspension cables are suspension points which are marked as suspension points D1, D2 and …, a suspension point Dn-1 and a suspension point Dn in a one-to-one correspondence manner; the cable force values of the suspension cables are respectively the cable force N1, the cable forces N2, …, the cable force Nn-1 and the cable force Nn in a one-to-one correspondence manner; marking the centers of the mortises at the two ends of the bottom of the top plate as an endpoint A and an endpoint B respectively; the relative distance between the end point A and the end point B under different sling cable force distribution working conditions is obtained by calculation according to the following steps:
the unit definition is that the sling is set as a rod unit linkelement which only has tensile rigidity and large structural slenderness; the top plate 1 is arched, and is set into a six-surface entity unit solid based on the arched structure of the top plate so as to obtain higher precision;
the material selection is selected according to deformation conditions, the top plate in a hoisting state meets the assumption of small deformation of material mechanics, the material is set as an elastic constitutive structure, and only the elastic modulus, the Poisson ratio and the density are considered;
the grid division is selected as mapping division to improve the calculation precision.
Step 4, load boundary processing
And combining the load boundary with the displacement boundary, and adjusting the distribution value of the cable force of each sling to be consistent with the set distribution value of the cable force of the sling, thereby obtaining the deformation of the top plate under the state of the set distribution value of the sling, so as to meet the requirement of side wall assembly deviation during the assembly of the top plate.
Because the side wall assembly deviation has no adjustable allowance during the assembly of the top plate, the problem can be solved only by adjusting the relative position of the mortise at the bottom of the top plate, based on the adjustment, the top plate structure can be elastically deformed by adjusting the sling cable force distribution value, and the corresponding displacement of the mortise at the bottom of the top plate can be obtained by designing different sling cable force distribution values; the processing mode of combining the load boundary and the displacement boundary can accurately adjust the internal force of the sling to be consistent with the designed given distribution force, so as to obtain the accurate deformation of the top plate under the changed state; finite element calculations require certain displacement constraints to ensure that the calculations converge and tend to a steady state.
In the embodiment, the sling S1 and the sling Sn are subjected to full displacement constraint, namely, the full displacement constraint is carried out by an X axial limit value Ux, a Y axial limit value Uy and a Z axial limit value Uz, wherein the Y axial negative direction is consistent with the gravity direction; the suspension cable S2 and the suspension cable Sn-1 are selected to adopt incomplete displacement constraint, displacement constraint is carried out only by an X-axis limit value Ux and a Z-direction limit value Uz, a load boundary is adopted in a Y-axis direction, and the set load value is equivalent to the designed cable force and is in the same direction. The structural system calculation is converted into a statically determinate problem after the boundary processing, and all sling internal forces are consistent with the designed cable force distribution value at the moment.
However, if the conventional statics method is adopted for processing, the cable force distribution values are difficult to be consistent with the design cable force distribution values, the debugging process is complex and time-consuming, the efficiency is low, and the requirements of practical application are difficult to meet.
In the concrete implementation, in the transient dynamics calculation, the model inertia force is considered, the corresponding top plate speed and top plate acceleration exist along with the time change of a top plate structure in the calculation process, the actual hoisting implementation is carried out in the stable state of top plate hoisting, and the top plate speed and the top plate acceleration are set to be 0 values; in order to obtain a stable top plate suspension state, the speed and the acceleration of the damping dissipation top plate are set, and a sufficient time length T is set to obtain a stable hoisting state of the top plate.
In the embodiment, based on the ANSYS transient dynamics calculation method, the horizontal relative displacement of the mortises on the two sides of the top plate under the action of different designed sling loads can be quickly and accurately solved, and the defects of poor boundary processing rationality, low calculation precision, incomplete consideration factors and the like in the process of hoisting deformation analysis of the fabricated structure in the conventional statics calculation method are overcome.
Claims (3)
1. The method for adjusting the hoisting deformation to realize the assembly of the top plate and the side wall of the assembly station is characterized by comprising the following steps of: establishing a top plate-sling finite element coupling model based on a finite element model analysis method; solving the finite element coupling model of the top plate and the sling through transient dynamics to obtain the corresponding relation between the lifting deformation of the top plate and the cable force distribution value of the sling; in the assembling process, the hoisting deformation of the top plate is changed by adjusting the cable force distribution value of the sling, so that the relative distance of the central points of the mortises at the two ends of the bottom of the top plate meets the existing deviation of the side walls, and the assembling between the top plate and the side walls is ensured to be successfully completed in place;
in the top plate-sling limited unit coupling model, the number of slings is set to be n, wherein n is not less than 4;
marking the centers of the mortises at the two ends of the bottom of the top plate as an endpoint A and an endpoint B respectively; the relative distance between the end point A and the end point B under different sling cable force distribution working conditions is obtained by calculation according to the following steps:
step 1, establishing a top plate-sling geometric model of an assembly station, namely respectively constructing geometric entities of a top plate and a sling according to structural design by adopting a separated modeling method, and establishing the top plate-sling geometric model aiming at the geometric entities;
step 2, obtaining a top plate-sling limited unit coupling model in the top plate-sling geometric model through unit definition, material selection and mesh division;
step 3, selecting a transient dynamics calculation module in ANSYS software, performing transient dynamics calculation according to a dynamics equation of the top plate-sling finite element coupling model, and obtaining a corresponding relation between a cable force distribution value of each sling and a top plate deformation amount subjected to elastic deformation, wherein the top plate deformation amount refers to a variation of a relative distance between tongue-and-groove center points of two end points at the bottom of the top plate caused by the elastic deformation of the top plate, namely a variation of a relative distance between the end point A and the end point B;
step 4, load boundary processing
And combining the load boundary with the displacement boundary, and adjusting the distribution value of the cable force of each sling to be consistent with the set distribution value of the cable force of the sling, thereby obtaining the deformation of the top plate under the state of the set distribution value of the sling, so as to meet the requirement of side wall assembly deviation during the assembly of the top plate.
2. The method for realizing the assembly of the top plate and the side wall of the assembled station by adjusting the hoisting deformation as claimed in claim 1, wherein in the step 2:
the unit definition is that the sling is set as a rod unit with tensile rigidity only, and the top plate is set as a hexahedral solid unit based on the arch structure of the top plate;
the material selection is selected according to deformation conditions, the top plate in a hoisting state meets the assumption of small deformation of material mechanics, the material is set as an elastic constitutive structure, and only the elastic modulus, the Poisson ratio and the density are considered;
the grid division is selected as mapping division so as to improve the calculation precision.
3. The method for realizing the assembly of the top plate and the side wall of the assembled station by adjusting the hoisting deformation amount according to claim 1, which is characterized in that: in the transient dynamics calculation, model inertia force is considered, corresponding top plate speed and top plate acceleration exist in the top plate structure along with time change in the calculation process, actual hoisting is carried out in the stable state of top plate hoisting, and the top plate speed and the top plate acceleration are set to be 0 value; in order to obtain a stable top plate suspension state, the speed and the acceleration of the damping dissipation top plate are set, and a sufficient time length T is set to obtain a stable hoisting state of the top plate.
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