CN111414656A - Segmental casting method and analysis method for large-volume radiation-proof concrete wall - Google Patents
Segmental casting method and analysis method for large-volume radiation-proof concrete wall Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000004458 analytical method Methods 0.000 title claims abstract description 31
- 238000005266 casting Methods 0.000 title claims description 30
- 230000009191 jumping Effects 0.000 claims abstract description 5
- 230000035772 mutation Effects 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 230000005855 radiation Effects 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 claims description 32
- 230000036571 hydration Effects 0.000 claims description 14
- 238000006703 hydration reaction Methods 0.000 claims description 14
- 238000004088 simulation Methods 0.000 claims description 11
- 230000020169 heat generation Effects 0.000 claims description 9
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- 230000008878 coupling Effects 0.000 claims description 8
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Abstract
The invention discloses a sectional pouring method for a large-volume radiation-proof concrete wall, which comprises the following steps of S01: segmenting the large-volume radiation-proof concrete wall at the position of the structure mutation, wherein the number of the segments is not less than 3; s02: and (4) performing concrete raw material pouring on the segmented large-volume radiation-proof concrete wall by adopting a cabin jumping method. The method can effectively realize the uniform pouring of the concrete wall with super-long, thicker and larger volume, is particularly suitable for the pouring of the engineering wall with the proton ray radiation protection requirement, has the characteristics of less single pouring amount and controllable pouring uniformity, avoids the crack problem caused by the internal and external temperature difference and stress concentration during the large-volume pouring, further discloses an analysis method corresponding to the sectional pouring method, can effectively analyze the performance of the poured wall, thereby determining the pouring section number, the pouring gap time and other rules which are most suitable for the actual requirement, and further effectively guides the determination and adjustment of the actual pouring scheme.
Description
Technical Field
The invention relates to the field of buildings, in particular to a sectional pouring method for a large-size radiation-proof concrete wall.
Background
Due to the fact that the section size of the large-volume concrete structure is large, when the large-volume concrete structure is poured, internal hydration heat is large and cannot be dissipated timely, internal temperature rises, large internal and external temperature difference is formed, under the condition that temperature and humidity change, concrete is hardened and generates volume deformation, various materials in the concrete deform inconsistently and are mutually constrained to generate initial stress, and fine cracks which cannot be seen by naked eyes occur between aggregate and a cement bonding surface or cement. The distribution of the fine cracks is irregular and discontinuous, but under the action of load or further temperature difference and drying shrinkage, the cracks begin to spread and gradually communicate with each other, so that larger cracks visible to the naked eye appear.
For proton treatment engineering, because a concrete building structure needs to meet the effect of preventing proton ray radiation, the large-volume radiation-proof concrete building structure of the proton treatment engineering project has the characteristics of thicker thickness (the thickness of a common single structural body can reach about 4 meters), overlong length (the length of the common single structural body can reach about 80 meters) and larger volume (the length of the common single structural body can reach 2000 cubic meters), and the crack control of the large-volume radiation-proof concrete building structure is generally less than 0.2mm and the crack generation is strictly prohibited, so that a new industrial problem is generated on how to pour the large-volume radiation-proof concrete, and the problem is urgently needed to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a sectional pouring method for a large-volume radiation-proof concrete wall, and aims to solve the problem of concrete pouring of the existing proton treatment engineering project.
The technical scheme adopted by the invention for solving the problems is as follows: the method for casting the large-size radiation-proof concrete wall in sections comprises the following steps:
s01: segmenting the large-volume radiation-proof concrete wall at the position of the structure mutation, wherein the number of the segments is not less than 3;
s02: and (4) performing concrete raw material pouring on the segmented large-volume radiation-proof concrete wall by adopting a cabin jumping method. Preferably, the skip method comprises the following steps:
s021: firstly, pouring a first batch of odd-numbered subsections;
s022: a second batch of casting is then performed on the even-numbered segments.
Preferably, each section of concrete is poured in sequence from bottom to top in a layered pouring mode.
The structure abrupt change part refers to a structure from a structure in the longitudinal and transverse directions to the interface of the wall.
Further, the method for analyzing the large-volume radiation-proof concrete wall body poured in sections comprises the following steps:
s11: and (3) sampling the test block, and detecting the physical and mechanical time-varying properties of the early-age test block, wherein the physical and mechanical time-varying properties comprise hydration heat release, strength, elastic modulus, creep degree and the like.
S12: and determining the thermal boundary of the test block, simulating a temperature field in finite element software to obtain the maximum internal and external temperature difference of the test block (the temperature difference is not allowed to exceed 25 ℃), and selecting a convection heat release coefficient and maintenance calculation time length which meet the requirements so as to obtain the type of the maintenance material and the maintenance time length.
Preferably, the method further comprises the following steps:
s13: to the test block atFinite elementAnd performing thermal-force coupling performance simulation in software, wherein the thermal-force coupling performance simulation comprises analysis of a temperature field and a stress field of the test block.
Preferably, the thermal-mechanical coupling performance simulation comprises analysis of a temperature field and a stress field of the test block;
the temperature field analysis process comprises the following steps:
s1311: establishing a finite element model, defining a temperature unit, and meshing a part to be analyzed of the finite element model;
the grid division rule is as follows: high-density grid division is carried out on the main part to be analyzed of the test block, higher-density grid division (generally more than or equal to 16 nodes) is carried out on the section mutation position, and low-density grid division is carried out on the secondary part to be analyzed of the test block.
S1312: inputting time-varying thermal parameters and time-invariant thermal parameters;
s1313: defining hydration heat generation rate, applying the hydration heat generation rate as body load to a finite element model, and introducing a living and dead unit to simulate the sectional pouring of the concrete wall;
s1314: obtaining a temperature field analysis result, including calculating a time duration.
Preferably, the stress field analysis process is as follows:
s1321: converting the finite element model established by the temperature field analysis established in the step S1311 into a finite element model for stress field analysis;
s1322: inputting time-varying mechanical parameters and time-invariant mechanical parameters;
s1323: applying the temperature field analysis result obtained in the step S1314 as a node load to the finite element model in the step S1321, and introducing a living and dead unit to simulate the segmented pouring of the concrete wall;
s1324: and obtaining a stress field analysis result, including a time step, a maximum number of equilibrium iterations, a convergence criterion and the like. Preferably, the segmental casting method for the life and death unit simulation concrete wall in step S1313 or step S1323 includes: and killing the wall units to be poured, and gradually activating the units at corresponding pouring moments so as to simulate the pouring process of the concrete wall.
Preferably, the time-varying thermal parameters include hydration heat generation rate, ambient temperature and the like; the time-invariant thermal parameters comprise mold-entering temperature, specific heat, heat conductivity coefficient, equivalent convection heat release coefficient and the like.
Preferably, the time-varying mechanical parameters include elastic modulus, tensile strength, creep degree, and the like; the time-invariant mechanical parameters comprise density, Poisson's ratio, linear expansion coefficient and the like, and the effect of the steel bars is considered by defining volume reinforcement ratio and dispersing the steel bars into the concrete unit.
The invention has the following beneficial effects: the sectional casting method of the large-volume radiation-proof concrete wall can effectively realize the uniform casting of the concrete wall with super-long length, thicker thickness and larger volume, is particularly suitable for the casting of the engineering wall with the proton ray radiation-proof requirement, has the characteristics of small single casting amount and controllable casting uniformity, avoids the crack problem caused by the internal and external temperature difference and stress concentration during the large-volume casting, can meet the standard that the crack is less than 0.2mm and no through seam is generated after the casting, further provides the analysis method of the large-volume radiation-proof concrete wall by sectional casting, and further detects and verifies the performance data of the concrete wall cast by the casting method by sampling a test block, determining the thermal boundary of the concrete after the casting and simulating the thermal-force coupling performance so as to determine the rules of casting section quantity, casting gap time and the like which are most suitable for the actual requirement, and further effectively guides the determination and adjustment of the actual pouring scheme.
Drawings
FIG. 1 is a schematic flow chart of a sectional casting method for a large-volume radiation-proof concrete wall body according to the invention;
fig. 2 is a schematic structural diagram of the skip method in step S02 in fig. 1;
fig. 3 is a flow chart of a method for analyzing a large-volume radiation-proof concrete wall poured in sections according to the invention.
Detailed Description
The invention is further described below with reference to the specific drawings.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures, steps, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.
As shown in fig. 1 and 2, a method for casting a large-volume radiation-proof concrete wall body in sections is provided, which comprises the following steps:
s01: segmenting the large-size radiation-proof concrete wall at the position of the structure mutation, wherein the number of the segments is 6;
s02: and (4) performing concrete raw material pouring on the segmented large-volume radiation-proof concrete wall by adopting a cabin jumping method.
As shown in fig. 2, the specific skip method includes the following steps:
s021: firstly, carrying out first batch of concrete pouring on the subsection with the number of 1.3.5;
s022: a second concrete pour is then made on the segment numbered 2.4.6.
Of course, the number of segments can be any natural number greater than 3 segments according to actual requirements.
The method for jumping the cabin is based on the principle of 'resisting and releasing, mainly resisting, firstly releasing and then resisting', and fully deforming each part by reasonably setting the distance between the cabin and the cabin, thereby releasing the stress.
When each section of pouring is carried out, the pouring is carried out sequentially in a layered pouring mode from bottom to top, the pouring height of each layer is 500mm, and the pouring is carried out until the actual required height is reached (in practice, the designed elevation is generally taken as the standard).
As shown in fig. 3, a concrete analysis method poured by the sectional pouring method for the large-volume radiation-proof concrete wall body shown in fig. 1 is provided, which specifically includes the following steps:
s11: sampling the test block of the cast large-volume radiation-proof concrete wall, and detecting the physical and mechanical time-varying properties of the test block in the early stage (generally, 3 days, 7 days, 14 days and 28 days after casting), wherein the physical and mechanical time-varying properties comprise parameters such as hydration heat release, strength, elastic modulus and creep degree of the concrete test block.
Wherein: hydration heat release is a main factor causing concrete temperature rise, is a first-priority object in large-volume concrete design and construction, has extremely complex heat release rule, and further influences the determination of a concrete temperature field;
wherein: the strength of the concrete test block is an important index of the quality of the concrete, and comprises analysis of compressive strength and tensile strength;
wherein: the elastic modulus can effectively analyze the change of stress and strain when the sampling test block composition material deforms, and is the representation of the deformation difficulty of the test block;
wherein: the creep degree is an important parameter for testing the characteristic change of the concrete test block when loading.
Of course, the test block further comprises performance parameters such as stress relaxation coefficient of the sampling test block.
S12: and determining a test block thermal boundary, simulating a temperature field in finite element software to obtain the maximum internal and external temperature difference of the test block, and selecting a convection heat release coefficient and maintenance calculation time length which meet requirements so as to obtain the type of the maintenance material and the maintenance time length.
S13: and carrying out thermal-force coupling performance simulation on the test block in finite element software, wherein the thermal-force coupling performance simulation comprises the simulation analysis of a temperature field and a stress field of the test block.
Wherein: the temperature field analysis process comprises the following steps:
s1311, establishing a finite element model, defining SO L ID70 as a temperature unit, meshing the to-be-analyzed part of the finite element model, performing high-density meshing on the main to-be-analyzed part of the test block, performing higher-density meshing (such as 16 nodes) on the sudden change part of the section, and performing low-density meshing on the secondary to-be-analyzed part of the test block.
S1312: inputting thermal material performance parameters: including time-varying thermal parameters and time-invariant thermal parameters; the time-varying thermal parameters comprise hydration heat generation rate and ambient temperature; the time-invariant thermal parameters comprise mold-entry temperature, specific heat, thermal conductivity and equivalent convection heat release coefficient.
S1313: defining hydration heat generation rate, applying the hydration heat generation rate as body load to a finite element model, introducing a live-dead unit to simulate segmental casting of a concrete wall, killing a wall unit to be cast, and gradually activating the unit at a corresponding casting moment so as to simulate a casting process of the concrete wall;
s1314: and obtaining a temperature field analysis result.
Wherein: the stress field analysis process comprises the following steps:
s1321, converting the finite element model established by the temperature field analysis established in the step S1311 into a finite element model for stress field analysis, and defining SO L ID65 as a stress unit;
s1322: inputting time-varying mechanical parameters and time-invariant mechanical parameters; the time-varying mechanical parameters comprise elastic modulus, tensile strength, creep degree and other mechanical material performance parameters; the time-invariant mechanical parameters include density, poisson's ratio, linear expansion coefficient, and the like.
S1323: applying the temperature field analysis result obtained in the step S1314 as a node load to the finite element model in the step S1321, introducing living and dead units to simulate the segmental casting of the concrete wall, killing the wall units to be cast, and gradually activating the units at corresponding casting moments so as to simulate the casting process of the concrete wall;
s1324: and obtaining a stress field analysis result.
The above description is for the purpose of describing the invention in more detail with reference to specific preferred embodiments, and it should not be construed that the embodiments are limited to those described herein, but rather that the invention is susceptible to various modifications and alternative forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A sectional pouring method for a large-size radiation-proof concrete wall body is characterized by comprising the following steps: the method comprises the following steps:
s01: segmenting the large-volume radiation-proof concrete wall at the position of the structure mutation, wherein the number of the segments is not less than 3;
s02: and (4) performing concrete raw material pouring on the segmented large-volume radiation-proof concrete wall by adopting a cabin jumping method.
2. The method for casting the large-volume radiation-proof concrete wall body in sections according to claim 1, wherein the method comprises the following steps: the skip method comprises the following steps:
s021: firstly, pouring a first batch of odd-numbered subsections;
s022: a second batch of casting is then performed on the even-numbered segments.
3. The method for casting the large-volume radiation-proof concrete wall body in sections according to claim 1 or 2, wherein the method comprises the following steps: and pouring each section of concrete in sequence from bottom to top by adopting a layered pouring mode.
4. The method for analyzing the large-volume radiation-proof concrete wall body poured in sections is characterized by comprising the following steps of: the method comprises the following steps:
s11: sampling a test block, and detecting the physical mechanical time-varying performance of the test block in the early age, wherein the physical mechanical time-varying performance comprises hydration heat release, strength, elastic modulus and creep degree;
s12: and determining a test block thermal boundary, simulating a temperature field in finite element software to obtain the maximum internal and external temperature difference of the test block, and selecting a convection heat release coefficient and maintenance calculation time length which meet requirements so as to obtain the type of the maintenance material and the maintenance time length.
5. The method for analyzing the sectionally poured large-volume radiation-proof concrete wall body according to claim 4, wherein the method comprises the following steps: further comprising the steps of:
s13: to the test block atFinite elementAnd performing thermal-force coupling performance simulation in software, wherein the thermal-force coupling performance simulation comprises simulation analysis on a temperature field and a stress field of the test block.
6. The method for analyzing the sectionally poured large-volume radiation-proof concrete wall body according to claim 5, wherein the method comprises the following steps: the temperature field analysis process comprises the following steps:
s1311: establishing a finite element model, defining a temperature unit, and meshing a part to be analyzed of the finite element model;
s1312: inputting time-varying thermal parameters and time-invariant thermal parameters;
s1313: defining hydration heat generation rate, applying the hydration heat generation rate as body load to a finite element model, and introducing a living and dead unit to simulate the sectional pouring of the concrete wall;
s1314: and obtaining a temperature field analysis result.
7. The method for analyzing the sectionally poured large-volume radiation-proof concrete wall body according to claim 6, wherein the method comprises the following steps: the stress field analysis process comprises the following steps:
s1321: converting the finite element model established by the temperature field analysis in the step S1311 into a finite element model for stress field analysis;
s1322: inputting time-varying mechanical parameters and time-invariant mechanical parameters;
s1323: applying the temperature field analysis result obtained in the step S1314 as a node load to the finite element model in the step S1321, and introducing a living and dead unit to simulate the segmented pouring of the concrete wall;
s1324: and obtaining a stress field analysis result.
8. The method for analyzing the sectionally poured large-volume radiation protection concrete wall body according to claim 6 or 7, characterized in that: the segmental casting method for the life and death unit simulation concrete wall body in the step S1313 or the step S1323 comprises the following steps: and killing the wall units to be poured, and gradually activating the units at corresponding pouring moments so as to simulate the pouring process of the concrete wall.
9. The method for analyzing the sectionally poured large-volume radiation-proof concrete wall body according to claim 6, wherein the method comprises the following steps: the time-varying thermal parameters comprise hydration heat generation rate and ambient temperature; the time-invariant thermal parameters comprise mold-entry temperature, specific heat, thermal conductivity coefficient and equivalent convection heat release coefficient.
10. The method for analyzing the sectionally poured large-volume radiation-proof concrete wall body according to claim 7, wherein the method comprises the following steps: the time-varying mechanical parameters comprise elastic modulus, tensile strength and creep degree; the time-invariant mechanical parameters comprise density, Poisson's ratio and linear expansion coefficient.
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Cited By (3)
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| CN113529722A (en) * | 2021-07-20 | 2021-10-22 | 中国路桥工程有限责任公司 | Large-volume concrete construction device and construction method in marine environment |
| CN114293528A (en) * | 2022-02-18 | 2022-04-08 | 中铁十四局集团第四工程有限公司 | Device is pour to ship lock navigation wall |
| CN114525872A (en) * | 2022-01-14 | 2022-05-24 | 福建省实盛建设工程有限公司 | Construction method of assembled type superposed beam slab |
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