CN106779426B - Detection and evaluation method for safety of chemical pipe gallery structure - Google Patents
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- 239000000126 substance Substances 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- 238000011156 evaluation Methods 0.000 title claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 238000005260 corrosion Methods 0.000 claims abstract description 33
- 230000035515 penetration Effects 0.000 claims abstract description 8
- 230000007547 defect Effects 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims abstract description 4
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 10
- 238000007596 consolidation process Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000000644 propagated effect Effects 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
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- 239000010949 copper Substances 0.000 claims description 2
- 238000011835 investigation Methods 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a detection and evaluation method for the safety of a chemical pipe gallery structure, which comprises the following steps: measuring the residual thickness of the rusted pipe gallery component; aiming at the pipe gallery component with the butt weld having defects, the effective penetration depth of the butt weld is measured by adopting ultrasonic flaw detection; calculating the ratio of the designed plate thickness to the actual penetration depth; investigating corrosion influence parameters of the environment where the pipe gallery is located, and predicting future corrosion thickness damage of the pipe gallery structure; calculating the corrosion influence subentry coefficient; adopting beam units to establish a finite element model of the pipe gallery structure, and calculating bending moment, axial force, shearing force and internal force values of inclined struts of each component of the pipe gallery according to the finite element model; checking the structural strength of the pipe gallery; and checking the structural stability of the pipe gallery. The invention considers the influence of corrosion and the influence of construction quality on the safety of the pipe gallery structure.
Description
Technical Field
The invention relates to the field of building structure safety assessment.
Background
Currently, the safety assessment of steel structures mainly adopts the relevant calculation formula in the structural design specification:
wherein R represents the resistance of the structure, S represents the loading action, and gamma R and gamma S are the fractional coefficients of the resistance and the action respectively.
The numerical value of the load action S can be calculated by adopting structural mechanics for a simple structure, and can be calculated by a finite element method for a complex structure. The resistance R of the structure is determined by firstly determining the building materials adopted by the checked structure through a design drawing and then searching a corresponding table in the design specification. γ R and γ S are also determined by direct table lookup according to current specifications. However, although the pipe rack structure is built in a large amount in each chemical industry park at present, the related departments do not organize the compilation work of the design specifications of the pipe rack structure. If the safety of the public pipe gallery is evaluated by adopting the existing other steel structure specifications, the two main defects are that the influence of corrosion and construction defects on the structure cannot be described, and the characteristics of the pipe gallery structure construction cannot be reflected.
Disclosure of Invention
Aiming at the safety of the chemical pipe gallery structure, the corrosion influence and the construction quality influence are considered while effective detection and evaluation are carried out.
The technical scheme for realizing the purpose is as follows:
a detection and evaluation method for safety of a chemical pipe gallery structure comprises the following steps:
measuring the residual thickness D1 after rusting aiming at the corroded pipe gallery component;
aiming at the pipe gallery component with the butt weld having defects, the effective penetration depth of the butt weld is measured by adopting ultrasonic flaw detection; calculating the ratio gamma of the design plate thickness H to the actual penetration depthw；
Survey the corruption influence parameter of piping lane place environment to calculate and corrode thickness damage: d ═ ATn(ii) a Wherein, T is the corrosion time, and A is the corrosion damage of the first year of pipe gallery structure, and A ═ 0.031+ ∑ AiXi；n＝-0.079+∑niXi，XiRepresenting corrosion-influencing parameters, including environmental-influencing parameters and material-influencing parameters, AiRepresenting the weight coefficient corresponding to the rust influence parameter, n is the fitting parameter of the rust formula, niRepresenting a weight coefficient corresponding to the rust influencing parameter;
calculating total rust damage D2 ═ H-D1) + D;
calculating the corrosion influence subentry coefficient gammac＝H/(H-D2)；
Adopting beam units to establish a finite element model of the pipe gallery structure, and calculating the bending moment, axial force and shearing force of each component of the pipe gallery according to the finite element model;
multiplying the internal force value of the inclined strut obtained by finite element calculation by gamma0γ1γcγwCalculating stress, and checking the structural strength of the pipe gallery, wherein gamma0Is a structural safety factor, gamma1Is the load component coefficient;
multiplying the internal force value of the compression inclined strut by gamma0γ1γwAnd calculating stress and checking the structural stability.
In the method for detecting and evaluating the safety of the chemical pipe gallery structure, the residual thickness D1 is subject to the measurement data of the position with the most serious corrosion.
In the above method for detecting and evaluating the safety of the chemical pipe gallery structure, the investigation of the corrosion influence parameters of the environment where the pipe gallery is located includes:
collecting rainwater at different positions of the pipe gallery component, testing and converting to obtain the daily average settlement of various corrosive and harmful chemical substances in the unit area of the pipe gallery structure;
measuring and calculating the annual average air temperature of the pipe gallery;
measuring and calculating the humidity of the pipe gallery;
and determining the annual rainfall capacity and annual average sunshine hours of the place where the pipe gallery is located.
In the method for detecting and evaluating the safety of the chemical pipe gallery structure, X isiRespectively as follows: annual average relative humidity, annual average temperature, chloride ion deposition rate, sulfur dioxide deposition rate, rainfall x sunshine duration, and the contents of copper, manganese, silicon, phosphorus, sulfur, nickel, molybdenum, carbon, respectively, in the steel.
In the method for detecting and evaluating the safety of the chemical pipe gallery structure, the structural safety coefficient gamma0Taking the load component coefficient gamma as 1.11Take 1.2.
In the above-mentioned detection evaluation method of chemical industry pipe gallery structure security, after calculating corrosion influence subentry coefficient gammac, the effect of air hammer power to the pipe gallery in the analysis chemical industry pipeline calculates its air hammer power:
ΔP＝10-6ραΔV；
wherein △ P is the instantaneous pressure change value caused by water hammer, △ V is the instantaneous change of flow speed, rho is the density of fluid before water hammer occurs, α is the wave speed propagated by water hammer, K is the bulk modulus of elasticity of liquid, delta is the wall thickness of pipeline, and E is the elasticity of pipeA modulus of elasticity; diIs the inner diameter of the tube.
In the above method for detecting and evaluating the safety of the chemical pipe gallery structure, in the finite element model,
the geometrical characteristic parameters of each rod beam unit are determined by calculating the section shape of the rod;
the node of each beam unit is arranged at the intersection point of the actual structure;
replacing chemical material pipelines arranged on the pipe gallery with corresponding loads to be loaded at the supporting nodes of the pipe gallery structure;
applying a water hammer load parallel to the direction of the chemical pipeline on a pipe gallery structure which directly supports the pipeline and is close to the chemical pipeline valve;
converting the maintenance road, the electric cable and other auxiliary equipment into a vertical downward load to be loaded on the finite element model;
between the pipe gallery structures, vertical and horizontal rod pieces are connected by end consolidation, and the pipe gallery diagonal bracing members are modeled in a consolidation mode and a hinging mode respectively in consideration of poor welding quality of the pipe gallery diagonal bracing members;
the internal force value of the inclined strut is the larger result calculated under two constraint conditions of consolidation and hinging.
The invention has the beneficial effects that: according to the invention, through effective and reasonable detection and calculation steps, the influence of the environment on the corrosion of the steel member, the construction quality and the like can be considered in the safety assessment of the pipe gallery structure, and the practicability is greatly enhanced.
Drawings
Fig. 1 is a flow chart of the method for detecting and evaluating the safety of the chemical pipe rack structure.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the method for detecting and evaluating the safety of a chemical pipe rack structure according to the present invention includes the following steps:
collecting data of a pipe gallery structure, wherein the data comprises material information, specification and size of each metal component, installation sequence and connection method of each component, and load information of chemical material pipelines borne by the pipe gallery.
Secondly, detect the piping lane, specifically include:
a) when the member was found to be corroded, the remaining thickness D1 after the member was corroded was measured with a vernier caliper. The measured data of the most severe locations of corrosion are used as the standard.
b) And when the butt welding seam of the component has defects, determining the effective penetration depth of the butt welding seam by adopting ultrasonic flaw detection. Calculating gamma from the ratio of the design sheet thickness H to the actual penetration depthw。
c) And when the truss is found to have the downwarp deformation, measuring the new position of each node of the truss by using the total station.
d) And (4) rechecking the sizes of all the pipe gallery components by using a steel ruler and a vernier caliper, and rechecking the drawing data.
And thirdly, investigating the corrosion influence parameters of the environment where the pipe gallery is located, and calculating and predicting the corrosion amount.
a) Different positions on the pipe gallery component are provided with rainwater collection bottles (which can be replaced by clean plastic bottles) for collecting rainwater, and the content of each corrosive harmful chemical substance in the collection bottles is determined by chemical examination (mainly detecting Cl)-、SO42-、NO3-) And converting to obtain the settlement amount of each corrosive harmful chemical substance in the unit area daily of the pipe gallery structure.
b) Install thermometer or corresponding automatic temperature recording equipment on the piping lane, the record temperature and the annual average temperature of statistics piping lane.
c) The hygrometer is installed on the pipe gallery, and the humidity of the pipe gallery environment is measured.
d) And investigating the data of the surrounding weather stations, and determining the annual rainfall and annual average sunshine duration of the location of the pipe gallery.
e) The extent of corrosion of the tube lane components after a period of time is calculated and predicted.
Calculating corrosion thickness damage: d ═ ATn；
Wherein T is the corrosion time, and is recommended to be 10 years; a is the rust damage of the first year of the pipe gallery structure, and A is 0.031+ ∑ AiXi；n＝-0.079+∑niXi，XiRepresenting corrosion-influencing parameters, including environmental-influencing parameters and material-influencing parameters, AiRepresenting the weight coefficient corresponding to the rust influence parameter, n is the fitting parameter of the rust formula, niRepresenting a weight coefficient corresponding to the rust influencing parameter;
the above parameters are taken according to the following table 1:
TABLE 1
f) The currently measured plate thickness corrosion loss and the predicted plate thickness corrosion damage which may appear in the future of the pipe gallery component are superposed to be used as the total corrosion damage of the component. Namely: calculating total rust damage D2 ═ H-D1) + D;
obtaining the corrosion influence component coefficient gamma according to the ratio of the design plate thickness of the pipe gallery member to the residual plate thickness after subtracting the total corrosion damagec. Namely: calculating the corrosion influence subentry coefficient gammac＝H/(H-D2)。
And fourthly, analyzing the effect of the air hammer force on the pipe gallery in the chemical pipeline, and calculating the air hammer force.
ΔP＝10-6ραΔV；
Wherein △ P is the instantaneous pressure change value caused by water hammer, △ V is the instantaneous change of flow speed, m/s, rho is the density of fluid before water hammer, t/m3, α is the wave speed propagated by water hammer, m/s, K is the bulk modulus of elasticity of liquid, MPa, delta is the wall thickness of pipeline, cm, E is the modulus of elasticity of pipe, MPa, DiIs the inner diameter of the tube, cm.
And fifthly, establishing a finite element model of the pipe gallery structure by adopting the beam units, and calculating the bending moment, the axial force and the shearing force of each component of the pipe gallery according to the finite element model. Wherein, in the finite element model:
the geometrical characteristic parameters of each rod beam unit are determined by calculating the section shape of the rod;
the node of each beam unit is arranged at the intersection point of the actual structure;
replacing chemical material pipelines arranged on the pipe gallery with corresponding loads to be loaded at the supporting nodes of the pipe gallery structure;
applying a water hammer load parallel to the direction of the chemical pipeline on a pipe gallery structure which directly supports the pipeline and is close to the chemical pipeline valve;
converting the maintenance road, the electric cable and other auxiliary equipment into a vertical downward load to be loaded on the finite element model;
between the pipe gallery structures, vertical and horizontal rod pieces are connected by end consolidation, and the pipe gallery diagonal bracing members are modeled in a consolidation mode and a hinging mode respectively in consideration of poor welding quality of the pipe gallery diagonal bracing members;
the internal force value of the inclined strut is the larger result calculated under two constraint conditions of consolidation and hinging.
Sixthly, checking the structure, including:
a) taking the coefficient of structural safety gamma0Taking the load component coefficient gamma as 1.11Take 1.2.
b) When checking the strength, multiplying the internal force value of the inclined strut calculated by the finite element by gamma0γ1γcγwStress is calculated (the method for calculating the stress by internal force refers to relevant material mechanics theories and is not used as the declaration content), and the resistance of the member is valued according to data provided by partial sections of materials in the current steel structure design specification;
c) when the checking calculation is stable, only the pressed component is checked, and the corrosion is considered to have no influence on the stability of the component in consideration of the non-uniformity of the corrosion distribution, so that the value of the internal force of the pressed inclined strut is multiplied by gamma0γ1γwAnd (4) calculating the stress, and calculating the resistance of the member according to a relevant formula of stable calculation in the current steel structure design specification.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (6)
1. The utility model provides a detection evaluation method of chemical industry piping lane structure security which characterized in that includes:
measuring the residual thickness D1 after rusting aiming at the corroded pipe gallery component;
aiming at the pipe gallery component with the butt weld having defects, the effective penetration depth of the butt weld is measured by adopting ultrasonic flaw detection; calculating the ratio gamma of the design plate thickness H to the actual penetration depthw；
Survey the corruption influence parameter of piping lane place environment to calculate and corrode thickness damage: d ═ ATn(ii) a Wherein T is corrosion time, and A is corrosion damage of the pipe gallery structure in the first year，A＝0.031+∑AiXi；n＝-0.079+∑niXi，XiRepresenting corrosion-influencing parameters, including environmental-influencing parameters and material-influencing parameters, AiRepresenting the weight coefficient corresponding to the rust influence parameter, n is the fitting parameter of the rust formula, niRepresenting a weight coefficient corresponding to the rust influencing parameter;
calculating total rust damage D2 ═ H-D1) + D;
calculating the corrosion influence subentry coefficient gammac＝H/(H-D2)；
Adopting beam units to establish a finite element model of the pipe gallery structure, and calculating the bending moment, axial force and shearing force of each component of the pipe gallery according to the finite element model;
multiplying the internal force value of the inclined strut obtained by finite element calculation by gamma0γ1γcγwCalculating stress, and checking the structural strength of the pipe gallery, wherein gamma0Is a structural safety factor, gamma1Is the load component coefficient;
multiplying the internal force value of the compression inclined strut by gamma0γ1γwCalculating stress, and checking the structural stability;
Xirespectively as follows: annual average relative humidity, annual average temperature, chloride ion deposition rate, sulfur dioxide deposition rate, rainfall x sunshine duration, and the contents of copper, manganese, silicon, phosphorus, sulfur, nickel, molybdenum, carbon, respectively, in the steel.
2. The method for detecting and evaluating the safety of the chemical pipe rack structure according to claim 1, wherein the residual thickness D1 is based on the measured data of the position with the most serious corrosion.
3. The method for detecting and evaluating the safety of the chemical pipe rack structure according to claim 1, wherein the investigation of the corrosion affecting parameters of the environment where the pipe rack is located comprises:
collecting rainwater at different positions of the pipe gallery component, testing and converting to obtain the daily average settlement of various corrosive and harmful chemical substances in the unit area of the pipe gallery structure;
measuring and calculating the annual average air temperature of the pipe gallery;
measuring and calculating the humidity of the pipe gallery;
and determining the annual rainfall capacity and annual average sunshine hours of the place where the pipe gallery is located.
4. The method for detecting and evaluating the safety of the chemical pipe rack structure according to claim 1, wherein the structural safety coefficient γ is0Taking the load component coefficient gamma as 1.11Take 1.2.
5. The method for detecting and evaluating the safety of the chemical pipe gallery structure according to claim 1, wherein after the corrosion influence polynomial coefficient γ c is calculated, the effect of the air hammer force in the chemical pipeline on the pipe gallery is analyzed, and the air hammer force is calculated:
ΔP＝10-6ραΔV；
wherein △ P is the instantaneous pressure change value caused by water hammer, △ V is the instantaneous flow rateVariation, rho is the density of the fluid before water hammer occurs, α is the wave velocity propagated by the water hammer, K is the bulk modulus of elasticity of the liquid, delta is the wall thickness of the pipe, E is the modulus of elasticity of the pipe, DiIs the inner diameter of the tube.
6. The method for detecting and evaluating the safety of the chemical pipe rack structure according to claim 1 or 5, wherein in the finite element model,
the geometrical characteristic parameters of each rod beam unit are determined by calculating the section shape of the rod;
the node of each beam unit is arranged at the intersection point of the actual structure;
replacing chemical material pipelines arranged on the pipe gallery with corresponding loads to be loaded at the supporting nodes of the pipe gallery structure;
applying a water hammer load parallel to the direction of the chemical pipeline on a pipe gallery structure which directly supports the pipeline and is close to the chemical pipeline valve;
converting the maintenance road, the electric cable and other auxiliary equipment into a vertical downward load to be loaded on the finite element model;
between the pipe gallery structures, vertical and horizontal rod pieces are connected by end consolidation, and the pipe gallery diagonal bracing members are modeled in a consolidation mode and a hinging mode respectively in consideration of poor welding quality of the pipe gallery diagonal bracing members;
the internal force value of the inclined strut is the larger result calculated under two constraint conditions of consolidation and hinging.
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