Seamless construction method and system for ultra-long reinforced concrete structure

Abstract

The invention provides a seamless construction method and system for an ultra-long reinforced concrete structure, and relates to the technical field of concrete structure construction.The method comprises the steps that the length of the ultra-long reinforced concrete structure is judged, and when the one-way length of the structure is larger than a preset seamless control length threshold value, a target structure area is recognized; structural shrinkage deformation and temperature deformation analysis is carried out, and a target expansion reinforcing band is determined; determining a target concrete mix proportion decision; and after shrinkage-compensating concrete is poured, the construction state of each construction section is monitored in real time, the mixing amount of the expanding agent and the pouring sequence are fed back and adjusted, and seamless continuous construction is completed by alternately pouring internal and external concrete. The technical problems that in the prior art, post-cast strip construction is generally adopted and can only be carried out after initial concrete shrinkage is basically stable, the whole construction period is remarkably prolonged, the influence of external factors is likely to happen, and the construction period is further delayed are solved.

Description

Technical Field

[0001] This invention relates to the field of concrete structure construction technology, specifically to a seamless construction method and system for ultra-long reinforced concrete structures. Background Technology

[0002] Post-cast strips are a crucial technique in traditional construction to prevent concrete from cracking due to shrinkage. Joints are left during the pouring of the main structural concrete, and the post-cast strip is poured after the concrete has hardened to a certain strength. However, because post-cast strip construction can only be carried out after the initial concrete shrinkage has largely stabilized (usually at least 42 days), the entire construction cycle is significantly extended. This is especially true for ultra-long reinforced concrete structures, where the extended construction cycle can affect the entire project schedule, preventing the owner from delivering the project on time. Furthermore, traditional construction methods typically involve multiple steps, such as post-cast strip construction, concrete mixing, pouring, and curing. The process is cumbersome and requires multiple adjustments to the concrete mix ratio, resulting in a long construction period. Particularly in ultra-long reinforced concrete structures, traditional methods make the construction schedule highly susceptible to external factors such as climate change and material supply, leading to further delays. Summary of the Invention

[0003] This application provides a seamless construction method and system for ultra-long reinforced concrete structures, aiming to solve the technical problem that the existing technology usually adopts post-pouring strip construction, which can only be carried out after the initial concrete shrinkage has basically stabilized, resulting in a significant extension of the entire construction cycle and susceptibility to external factors, leading to further delays in the construction period.

[0004] The first aspect disclosed in this application provides a seamless construction method for ultra-long reinforced concrete structures. The method includes: determining the structural length of the ultra-long reinforced concrete structure; identifying a target structural region when the unidirectional length of the structure exceeds a preset seamless control length threshold; performing structural shrinkage and temperature deformation analysis on the target structural region to determine a target expansion reinforcement zone; determining a target concrete mix proportion decision for the target expansion reinforcement zone based on structural design requirements and concrete mix proportion characteristics, wherein the target concrete mix proportion decision includes an expansive agent dosage indicator; pouring compensation shrinkage concrete for the target expansion reinforcement zone according to the target concrete mix proportion decision; monitoring the construction status of each construction section in real time; adjusting the expansive agent dosage and pouring sequence based on feedback; and completing seamless continuous construction by alternately pouring the inner and outer concrete of the target expansion reinforcement zone.

[0005] The second aspect of this application discloses a seamless construction system for ultra-long reinforced concrete structures. The system is used in the aforementioned seamless construction method for ultra-long reinforced concrete structures. The system includes: a target structural region identification module for determining the structural length of the ultra-long reinforced concrete structure; identifying a target structural region when the unidirectional length of the structure exceeds a preset seamless control length threshold; a deformation analysis module for analyzing structural shrinkage deformation and temperature deformation in the target structural region to determine a target expansion reinforcement zone; a mix proportion determination module for determining a target concrete mix proportion decision based on structural design requirements and concrete mix proportion characteristics within the target expansion reinforcement zone, wherein the target concrete mix proportion decision includes an expansion agent dosage indicator; and a seamless continuous construction module for real-time monitoring of the construction status of each construction section after pouring compensating shrinkage concrete for the target expansion reinforcement zone according to the target concrete mix proportion decision, providing feedback to adjust the expansion agent dosage and pouring sequence, and completing seamless continuous construction by alternately pouring the inner and outer concrete of the target expansion reinforcement zone.

[0006] One or more technical solutions provided in this application have at least the following beneficial effects: By determining the unidirectional length of ultra-long reinforced concrete structures, the system automatically identifies ultra-long structural regions, achieving accurate identification of large-span or complex structures. This process ensures the targeted nature of construction methods, allowing for the application of seamless construction techniques in eligible ultra-long structures and avoiding unnecessary complexity. Through shrinkage and temperature deformation analysis of the target structural region, the system assesses in advance the shrinkage and temperature stresses that concrete may encounter during construction and hardening. This analysis effectively predicts and identifies high-risk crack areas in the structure, providing a scientific basis for the subsequent placement of expansion reinforcement strips. Based on structural design requirements and concrete mix characteristics, the expansion reinforcement strips are rationally determined. The design location and concrete mix ratio ensure that the concrete meets design requirements in the expansion reinforcement zone, minimizing cracking caused by shrinkage stress. During the pouring of shrinkage-compensating concrete, the status of each construction section is monitored in real time, and the dosage of expansion agent and the pouring sequence are adjusted based on feedback. This process allows for precise control of concrete performance, and the adjustment of the expansion agent dosage can be dynamically optimized at different construction stages. The alternating pouring of inner and outer concrete effectively avoids cracking problems caused by poor joints between new and old concrete in traditional construction. Through alternating pouring, the continuity and seamless connection of the structure are formed, effectively improving the overall integrity of the structure.

[0007] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a seamless construction method for an ultra-long reinforced concrete structure, provided as an embodiment of this application.

[0009] Figure 2 This is a schematic diagram of a seamless construction system for an ultra-long reinforced concrete structure, provided as an embodiment of this application.

[0010] Explanation of reference numerals in the attached diagram: Target structure area identification module 10, deformation analysis module 20, mix proportion decision determination module 30, seamless continuous construction module 40. Detailed Implementation

[0011] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0012] Example 1, as Figure 1 As shown in the figure, this application provides a seamless construction method for ultra-long reinforced concrete structures, the method comprising: For ultra-long reinforced concrete structures, structural length is determined, and when the unidirectional length of the structure exceeds the preset seamless control length threshold, the target structural region is identified.

[0013] For ultra-long reinforced concrete structures, the unidirectional length of the structure, i.e., the dimension of the structure in its longest direction, is calculated. For long structures, especially when the unidirectional length exceeds a preset seamless control length threshold, it indicates that the structure has significant shrinkage deformation and temperature stress issues, thus requiring special construction methods, such as seamless construction. The seamless control length threshold is set based on the design specifications of the concrete structure, the structural type, and the engineering environmental conditions. For example, large spans or lengths, such as those exceeding 55 meters or longer, require special consideration. If the unidirectional length of the structure exceeds the preset threshold, this area is identified as the target structural area, requiring further design of expansion reinforcement strips and seamless construction.

[0014] Structural shrinkage deformation and temperature deformation analysis were performed on the target structural region to determine the target expansion reinforcement zone.

[0015] Concrete shrinks during the cement hydration process, especially in long structures. The stress caused by shrinkage can lead to cracking. By calculating the autogenous shrinkage strain and drying shrinkage strain of concrete at different ages, combined with structural dimensions and reinforcement, shrinkage deformation data at different locations are obtained. During concrete pouring, temperature changes cause expansion or contraction, and temperature differences can also generate stress within the concrete, especially in larger components. Considering the temperature differences during pouring, the temperature stress distribution in each section is calculated. Based on shrinkage deformation data and temperature stress analysis, combined with structural constraints such as surrounding reinforcement and formwork, the tensile stress distribution of the structure is calculated, and the potential risk of cracking is verified. The goal is to identify the areas with the highest tensile stress, i.e., areas that may lead to cracking. Based on the calculation results, expansion reinforcement strips are arranged along the length of the structure. These locations are crack control areas that require special attention. The expansion reinforcement strips not only offset the tensile stress caused by shrinkage but also prevent structural cracking through the expansion effect.

[0016] In the target expansion reinforcement zone, the target concrete mix proportion decision is determined according to the structural design requirements and concrete mix proportion characteristics, wherein the target concrete mix proportion decision has an expansion agent dosage indicator.

[0017] Based on design requirements, especially the structural strength, durability, and shrinkage control requirements, a suitable concrete mix proportion is selected. This mix proportion needs to meet specific workability constraints, such as slump, fluidity, and compressive strength. The role of the expansive agent is to counteract concrete shrinkage and generate a certain expansion effect to compensate for the volume shrinkage of concrete during hydration. The dosage of the expansive agent is determined experimentally to ensure that it effectively compensates for shrinkage without causing unnecessary expansion or structural damage. Based on the actual engineering conditions, a suitable expansive agent dosage is designed to ensure that the expansion performance of the concrete meets design requirements. The dosage of the expansive agent is a percentage of the total weight of the concrete, typically between 0.3% and 1%, and is adjusted according to the characteristics of the concrete and the needs of the project.

[0018] After the compensation shrinkage concrete for the target expansion reinforcement zone is poured according to the target concrete mix design, the construction status of each construction section is monitored in real time, and the dosage of expansion agent and the pouring sequence are adjusted accordingly. Seamless continuous construction is achieved by alternately pouring the inner and outer concrete of the target expansion reinforcement zone.

[0019] During concrete pouring, sensors and a monitoring system are used to monitor parameters such as temperature, humidity, and strength of the concrete in real time to ensure that the concrete quality in the expansion reinforcement zone meets design requirements. Based on the real-time monitoring results, the dosage of the expansion agent or the pouring sequence is dynamically adjusted. For example, if a section of concrete shows signs of early cracking, the dosage of the expansion agent needs to be increased, or certain construction steps (such as pouring speed or sequence) need to be adjusted to ensure construction quality. To ensure a smooth joint effect in the expansion reinforcement zone, an alternating pouring method is adopted, that is, high-strength concrete is poured first in the reinforcement zone, followed by ordinary concrete outside the reinforcement zone. This avoids cold joints and stress concentration problems, ensuring continuity and structural integrity. After ensuring that the concrete has fully hardened and reached the required strength, subsequent pouring operations continue to ensure that the expansion reinforcement zone is completely filled and forms a seamless, continuous structure.

[0020] Furthermore, for ultra-long reinforced concrete structures, structural length determination is performed. When the unidirectional length of the structure exceeds a preset seamless control length threshold, the target structural region is identified, including: Obtain the foundation structural information of the ultra-long reinforced concrete structure, wherein the foundation structural information includes the structural plan dimensions, structural system type, and floor height parameters; based on the structural system type and floor height parameters, match the concrete structure design code to determine the preset seamless control length threshold; obtain the unidirectional length of the structure based on the structural plan dimensions, and when the unidirectional length of the structure is greater than the preset seamless control length threshold, identify the target structural area.

[0021] Structural plan dimensions refer to the dimensions of a structure on a horizontal plane, including the building's width, length, and overall layout. For example, for a rectangular building, the plan dimensions include the length and width of the rectangle; for a complex polygonal building, multiple side lengths and angles are taken. Structural system type refers to the overall structural system of the building. Common structural systems include frame structures, frame-shear wall structures, and concrete-steel composite structures. The system type determines the overall stress distribution, component arrangement, and deformation characteristics of the structure. Floor height parameters refer to the height data of each floor in a building. For very long structures, floor height affects the overall deformation behavior, especially during concrete stress and temperature changes; differences in floor height can lead to different deformation responses in the structure.

[0022] Different structural systems possess different stress characteristics and deformation capacities. For example, frame structures are more flexible than shear wall structures, making them more susceptible to shrinkage and temperature deformation. When selecting the control length threshold for seamless construction, adjustments must be made based on the structural system's stiffness, flexibility, and tolerance to deformation. Floor height directly affects the building's vertical stiffness; higher-rise buildings deform more significantly than lower-rise buildings. Therefore, different seamless control length thresholds need to be designed for different floor heights. Building design codes in various regions contain specific design requirements for ultra-long structures, including recommended seamless control length thresholds. These codes comprehensively consider factors such as the structure's type, purpose, seismic intensity, and environmental conditions. Based on these codes and the specific parameters of the structure, they determine whether seamless construction is necessary and establish a suitable preset seamless control length threshold.

[0023] The unidirectional length of a structure refers to its maximum dimension in a single direction, either its widest or longest. In rectangular or complex planar buildings, the unidirectional length is the most significant length dimension. In practice, the maximum span or longest length of the building is used as the unidirectional length. After obtaining the unidirectional length of the structure, it is compared with a preset seamless control length threshold. If the unidirectional length exceeds the threshold, it indicates that the area may face significant shrinkage or temperature deformation issues, requiring seamless construction methods such as expansion reinforcement strips. At this point, the area is identified as the target structural area, meaning this part of the structure will enter the subsequent expansion reinforcement strip design and seamless construction stage. If the unidirectional length is less than the threshold, conventional construction methods can continue, without the need for special seamless construction measures.

[0024] Furthermore, structural shrinkage deformation and temperature deformation analysis are performed on the target structural region to determine the target expansion reinforcement zone, including: Based on the unidirectional length of the structure and the concrete structure design specifications, the ultra-long reinforced concrete structure is divided into multiple continuous calculation segments along its length. Based on the changes in the elastic modulus of concrete at different ages, the autogenous shrinkage strain and drying shrinkage strain of each continuous calculation segment are calculated, obtaining a set of shrinkage deformation data for each continuous calculation segment at different ages. Based on the changes in ambient temperature and concrete pouring temperature during construction, as well as preset constraint conditions, a set of temperature stress distributions generated during construction and hardening of each continuous calculation segment is calculated. Based on the shrinkage deformation data set and the temperature stress distribution set, combined with structural boundary conditions and external constraint coefficients, the tensile edge stress distribution is calculated, and crack width is verified to identify high-risk crack areas. Based on the tensile edge stress distribution and the high-risk crack areas, target expansion reinforcement strips are continuously arranged along the length, and the reinforcement strip arrangement parameters are determined, including width and local thickness.

[0025] Based on the unidirectional length of the structure, the entire structure is divided into several continuous calculation segments. The length of each calculation segment is determined according to the actual situation of the structure and design requirements. To ensure the accuracy of the analysis, the division of calculation segments takes into account the possible deformation differences in the structure and key nodes in the construction process, such as joints and support points. Each calculation segment has relatively independent shrinkage deformation and temperature stress behavior, and the boundary between adjacent calculation segments may become a high-risk area for stress concentration or cracks. Therefore, the divided calculation segments need to be able to accurately reflect the dynamic changes in the stress and deformation of the structure.

[0026] During the hardening process, the autogenous shrinkage effect caused by cement hydration leads to a reduction in concrete volume. This strain varies with the age of the concrete, therefore, it is necessary to calculate the autogenous shrinkage strain based on the age of the concrete (different stages from pouring to hardening). In addition to autogenous shrinkage, concrete also undergoes drying shrinkage due to moisture evaporation in the air. This shrinkage effect varies with the hardening of the concrete and temperature changes, thus requiring consideration of the drying shrinkage strain at different ages. The elastic modulus of concrete changes at different ages, with a lower elastic modulus in the early stages and a gradual increase with age. Based on the changes in the elastic modulus of concrete at different ages, the shrinkage deformation of each calculation segment at different ages is calculated. By calculating the shrinkage deformation of each continuous calculation segment at different ages, a complete set of shrinkage deformation data is obtained, providing fundamental data for subsequent temperature stress and crack control analysis.

[0027] During construction, ambient temperature varies with seasons and time, affecting the expansion and contraction of concrete. For example, in high-temperature environments, the hydration reaction of concrete accelerates, leading to increased temperature; in low-temperature environments, the cement hydration reaction is slower, resulting in lower temperature. Monitoring and recording temperature changes during construction and analyzing their impact are crucial.

[0028] Concrete has an initial temperature during pouring, which gradually changes over time. The temperature of concrete is typically high during pouring and gradually decreases as the hardening process progresses. Temperature changes cause volume changes in the concrete, especially in large structures, where variations in the temperature gradient can lead to the generation of temperature stress.

[0029] During construction, concrete structures are affected by supports and constraints (such as walls and formwork). These constraints prevent the stress caused by temperature changes from being released freely, thus forming internal temperature stress. Based on changes in ambient temperature, pouring temperature, and constraints, the temperature stress distribution of each calculation segment during construction and hardening is calculated. This stress distribution indicates how temperature-induced stress propagates within the structure, thereby providing data support for crack control.

[0030] Under the influence of multiple factors such as shrinkage and temperature changes, concrete can generate significant stress in certain areas of a structure. The tension edge refers to the location of the highest tensile stress in a concrete structure, typically the bottom or outer edge of the member. By combining shrinkage deformation data, temperature stress data, and boundary conditions, the stress distribution at the tension edge of the structure is calculated. Based on the calculated tension edge stress and the structure's crack resistance requirements, the crack width is verified. This involves a comprehensive evaluation of the concrete's tensile strength, crack control standards, and elastic modulus. If the stress exceeds the crack resistance, cracks will appear, requiring rigorous verification of the crack width. Through stress distribution analysis, the areas with the highest tensile stress and the highest probability of cracking are identified. These areas are high-risk areas for structural cracking and require additional reinforcement measures, such as adding expansion joints or increasing the density of reinforcing steel.

[0031] In areas with high tensile edge stress or high-risk cracking zones, expansion reinforcement strips are placed along the length. These strips, through the action of concrete expansion agents, alleviate the shrinkage stress of the concrete and prevent cracking. The placement parameters for each reinforcement strip are designed, and the width and local thickness of the reinforcement strip should be determined based on the stress state, deformation requirements, and structural bearing capacity of the area. Generally, areas of stress concentration require wider and thicker reinforcement strips, while areas with lower stress can have appropriately smaller reinforcement strips.

[0032] Furthermore, it also includes: Obtain the structural geometry, reinforcement layout parameters, concrete strength grade, and design constraints of the ultra-long reinforced concrete structure, and establish a target structure calculation model; substitute the reinforcement strip layout parameters into the target structure calculation model, calculate the simulated tensile stress of each continuous calculation segment, and verify whether it meets the preset crack control standard; if it does not meet the standard, perform feedback iterative optimization of the reinforcement strip layout parameters based on the simulated tensile stress until the preset crack control standard is met.

[0033] Obtain the overall structural dimensions, including length, width, height, and floor distribution. These geometric dimensions will serve as basic input data to help build the physical model of the structure. Obtain the specific reinforcement layout parameters, including reinforcement specifications, density, and placement. The reinforcement layout directly affects the tensile strength and crack resistance of the concrete structure. Select an appropriate concrete strength grade, such as C30 or C35, which will affect the compressive strength, crack resistance, and expansion properties of the concrete. Based on the project design requirements, obtain all constraints, including design safety factors, load requirements, and construction time constraints. These constraints ensure that the calculation model conforms to actual construction and design standards. By obtaining the above information, construct the target structural calculation model, which forms the basis for subsequent analysis and optimization.

[0034] The determined expansion joint reinforcement strip layout parameters are substituted into the target structural calculation model to analyze the stress state and crack control effect of the structure after adding the expansion joint reinforcement strip. Based on the reinforcement strip layout, the calculation model simulates the tensile stress in each calculation segment of the structure. The calculation process considers factors such as concrete shrinkage, temperature changes, loads, and the role of the expansion joint reinforcement strip in crack control. The simulation results are verified according to design standards and actual requirements to check whether the tensile stress meets the preset crack control standards. For example, design codes in some regions require that the crack width cannot exceed a certain value, such as 0.2 mm. If the simulated tensile stress exceeds this range, adjustments are necessary.

[0035] If the tensile stress exceeds the crack control standard, the arrangement parameters of the expansion joints must be adjusted. Adjustments can be made by increasing the width or thickness of the joints, or by adding more joints in areas of high stress. The goal of optimization is to maintain the tensile stress of the structure within an acceptable range during concrete shrinkage and temperature changes by altering the arrangement of the expansion joints, thus preventing cracking. The optimization process requires multiple iterations; each adjustment of the joint parameters necessitates a new simulation calculation and crack control verification. After each optimization, the analysis results determine whether the crack control standard is met, until the requirement is ultimately satisfied.

[0036] Furthermore, in the target expansion reinforcement zone, the target concrete mix proportion decision is determined based on structural design requirements and concrete mix proportion characteristics, including: Based on the structural design requirements and concrete mix proportion characteristics, the shrinkage-compensating concrete to be optimized is determined; the workability constraints of the shrinkage-compensating concrete to be optimized are obtained, including slump, fluidity, compressive strength, and expansion properties; based on the concrete mix proportion characteristics and the workability constraints, a concrete mixing control molecular space is constructed, and the performance of the concrete mixing control molecules is verified through a mixing control performance verification chain to generate a target concrete mix proportion decision.

[0037] Based on the project's structural design requirements, the main performance indicators of concrete are determined, such as strength grade, impermeability, durability, and expansiveness. These design requirements provide the basis for optimizing the concrete mix proportion. Shrinkage-compensating concrete requires consideration of the dosage of expansive agents and the combination of other materials to provide expansion during the concrete hydration and hardening process, compensating for the concrete's autogenous shrinkage and drying shrinkage deformation. The mix proportion selection must ensure that the concrete meets the designed strength and durability requirements while effectively preventing cracking.

[0038] Obtaining concrete workability indicators is crucial to ensure that its construction performance meets requirements without compromising its later strength and crack control. Slump is an indicator of concrete workability (e.g., fluidity). Slump requirements are set based on specific construction conditions and equipment requirements to ensure sufficient fluidity for easy pouring and vibration. Fluidity indicates the plasticity and ease of handling of concrete, especially important in pouring into complex molds and dense areas. Appropriate fluidity helps ensure uniform distribution of concrete during construction, reducing construction difficulty. Compressive strength measures the load-bearing capacity of concrete. According to structural design requirements, concrete must possess a certain compressive strength grade, which increases with curing age. Since shrinkage-compensating concrete is used, expansion performance is critical. The dosage of expansive agent and the expansion capacity of the concrete directly affect the crack control effect of the structure. Appropriate expansion performance can offset concrete shrinkage and prevent cracking, especially in tension areas.

[0039] Constructing the concrete mixing control molecular space refers to determining the relationships between different mix proportion variables under multi-dimensional performance constraints. These variables include the cement-to-water ratio, the dosage of expansive agent, and the ratio of sand and gravel. These variables collectively determine the workability and structural properties of the concrete. Within this space, each mix proportion corresponds to a control molecule. The performance verification chain verifies whether the mixing control molecule meets the set workability and structural requirements through a series of tests and experiments. The verification chain includes multiple nodes such as slump, flowability, compressive strength, and expansive properties, each corresponding to a specific concrete property. Each mix proportion is tested and verified to check its compliance with workability and structural requirements. For example, concrete specimens are poured and cured in the laboratory, and tests are conducted to verify the concrete's compressive strength, slump, and expansive properties. After multiple verifications and optimizations, a target concrete mix proportion that meets all performance requirements is finally selected. This decision will serve as the target mix proportion for actual use in the project.

[0040] Furthermore, this includes: The concrete mixing process is divided into K mixing control stages, and data mining is performed on each mixing control stage to generate K mixing control domains. Multiple mixing control atoms are randomly combined within the K mixing control domains to form multiple mixing control molecules, which are then added to the concrete mixing control molecule space. A mixing control performance verification chain is constructed based on the performance constraints, including performance verification nodes corresponding to each performance index. Iterative optimization is performed within the concrete mixing control molecule space to select the target concrete mix proportion decision that satisfies all performance verification nodes, and the dosage of the expansion agent is determined.

[0041] Based on the different stages of the concrete mixing process, K mixing control stages were defined. Each stage represents different processes such as mixing, adding cement, mixing additives, and adding expansion agents. Data from each control stage was mined and analyzed to identify the factors most significantly affecting concrete performance. Data mining employed statistical and machine learning methods to analyze the changing trends of each parameter and their impact on the final concrete performance. Based on the analysis results, the key parameters of each mixing control stage and their possible value ranges were defined as mixing control domains. These control domains will be used in the subsequent concrete mix designation optimization process.

[0042] Different parameter values ​​at each control stage, such as the dosage of expansive agent, the proportion of cement, and the sand-aggregate ratio, constitute mixing control atoms. These control atoms reflect the basic control units of concrete mixing. Randomly combining these mixing control atoms generates different mixing control molecules, representing different concrete mix proportion schemes. Each mixing control molecule has different expansive agent dosages, cement proportions, sand-aggregate ratios, etc. The generated set of mixing control molecules is added to the concrete mixing control molecule space, which represents all possible concrete mix proportion combinations.

[0043] Based on the aforementioned performance constraints, a performance verification chain is constructed. This chain consists of multiple nodes, each corresponding to a performance indicator, such as slump or compressive strength. A verification standard is set for each performance indicator; for example, the slump should be within a certain range, and the compressive strength should meet the design requirements. Each stirring control molecule will sequentially pass through these nodes for performance verification.

[0044] Iterative optimization is performed within the mixing control molecule space. Through calculation and verification, the parameters of the mixing control molecule, such as the dosage of expansive agent and the cement ratio, are continuously adjusted until the optimal mix proportion is found. Each optimization verifies the performance of the mixing control molecule in the performance verification chain, ensuring that all performance verification nodes pass. If a mix proportion fails a performance verification node, the scheme needs to be adjusted until all verification nodes meet the requirements. Finally, a mixing control molecule that meets all performance requirements is selected as the target concrete mix proportion, and the specific dosage of expansive agent is determined. This target mix proportion will be used as the concrete mix proportion in actual construction.

[0045] Furthermore, concrete mixing and pouring are carried out according to the target concrete mix design, and internal prestress is established in the target expansion reinforcement zone during the construction and hardening stages to compensate for shrinkage deformation.

[0046] The concrete mixing process is determined based on the target concrete mix proportions to ensure that the workability of the concrete meets the requirements. The workability of expansive concrete, in particular, requires special control to ensure smooth pouring and the achievement of the desired expansion effect. During concrete hydration, the expansive agent generates pre-compressive stress through expansion. This pre-compressive stress gradually builds up during the concrete hardening stage, primarily counteracting the tensile stress caused by autogenous shrinkage and drying shrinkage. This pre-compressive stress creates internal compressive stress in the expansion zone, effectively preventing crack formation. Concrete shrinkage deformation is unavoidable during hardening, especially during long-term use. The expansive agent effectively compensates for this shrinkage deformation, particularly in the expansion reinforcement zone, maintaining the stability and strength of the concrete structure. Compensating for shrinkage deformation not only helps prevent concrete cracking but also improves the durability of the structure.

[0047] Furthermore, it also includes: Double-layered dense wire mesh is installed on both sides of the target expansion reinforcement strip to define and isolate the area inside and outside the expansion reinforcement strip; a layered pouring control mechanism is set, including: S1: pouring high-content compensating shrinkage concrete in the area inside the expansion reinforcement strip; S2: before the concrete in the area inside the expansion reinforcement strip reaches the initial setting state or when a preset time window is reached, pouring ordinary compensating shrinkage concrete in the area outside the expansion reinforcement strip; based on the layered pouring control mechanism, continuous vibration and soft joint control are performed.

[0048] Double-layered dense wire mesh is installed on both sides of the target expansion reinforcement zone, at the boundary between the expansion and non-expansion zones of the concrete. The density and strength design of the wire mesh ensures that it can effectively disperse the tensile stress of the concrete structure over a wider area, thereby enhancing the integrity and crack resistance of the concrete. The double-layered wire mesh acts as an isolation layer, clearly defining the boundary between the inside and outside of the expansion reinforcement zone. This design prevents the expansion agent from adversely affecting the external structure during the concrete hydration process, while also better controlling the deformation of the expansion zone.

[0049] Within the expansion reinforcement zone, high-dosage shrinkage-compensating concrete is used to ensure effective compensation for shrinkage deformation in the expansion zone area. Specifically, concrete with a high proportion of expansive agent is used. This type of concrete expands during hydration, effectively counteracting the autogenous shrinkage and drying shrinkage of the concrete. The dosage of the expansive agent is determined according to design requirements, and the expansion rate is adjusted through experiments to generate appropriate expansion stress during hardening, thereby reducing cracks caused by shrinkage. The high-dosage shrinkage-compensating concrete is poured first to fill the area within the expansion reinforcement zone. At this point, the expansion performance of the concrete in this area ensures better stress management and avoids cracks caused by expansion.

[0050] Before the expansion-reinforced zone reaches its initial set, ordinary shrinkage-compensating concrete should be poured in the outer zone to ensure the continuity of the entire structure. Specifically, during pouring, the initial set of the concrete within the expansion-reinforced zone should be controlled to ensure sufficient expansion and good bonding. Generally, the expansion concrete should be poured before its initial set to avoid cold joints. Ordinary shrinkage-compensating concrete is used for the outer zone. This type of concrete does not require the high admixture of expansion agents found in the inner zone, but it still needs a certain shrinkage compensation capacity to prevent prolonged drying shrinkage and cracking. The concrete pouring sequence follows an inside-out, alternating layered approach to ensure effective control of expansion within the inner expansion zone and good fusion between the outer and inner concrete areas, avoiding cold joints.

[0051] Based on the layered pouring control mechanism, continuous vibration and flexible joint control ensure good bonding between poured concrete, eliminate potential cold joints, and ensure the integrity of the concrete structure. Specifically, the purpose of vibration is to ensure the compactness of the concrete, remove air and pores, and prevent the existence of segregation interfaces. Continuous vibration ensures that the concrete inside and outside the expansion zone is fully fused, avoiding segregation. During layered pouring, the flexible joint nature is controlled. Flexible joints refer to controlling the transition between layers so that the concrete between the upper and lower layers does not produce obvious interface cracks, but rather a smooth transition. By precisely controlling the pouring time, vibration method, and treatment of the transition interface of each layer of concrete, it is ensured that there are no cold joints or loose areas between the entire expansion zone area and the external structure.

[0052] Furthermore, in the layered pouring control mechanism, the time interval between the alternating pouring of S1 and S2 does not exceed the preset soft joint control time threshold.

[0053] During layered pouring, the alternating pouring of S1 (inner zone high-expansion concrete) and S2 (outer zone ordinary shrinkage-compensating concrete) must ensure that the time interval is not too long. This is to avoid the formation of obvious cold joints between the two layers of concrete. Cold joints occur when the pouring interval is too long, causing the newly poured concrete to fail to fully bond with the previous layer, creating a weak area. A soft joint refers to the transition zone between the newly poured and old concrete during the pouring process, which should have good adhesion and not form significant cracks. To maintain this soft joint characteristic, the pouring time must be controlled within a reasonable range. Excessive time intervals will cause the joint to harden, resulting in cold joints and affecting the integrity and crack resistance of the concrete. The specific alternation time interval is determined by a preset soft joint control time threshold. This threshold is determined through experience and experimentation, ensuring that the alternation pouring of each layer of concrete does not exceed this time interval to ensure optimal joint effect.

[0054] Example 2, based on the same inventive concept as the seamless construction method for an ultra-long reinforced concrete structure in the foregoing examples, such as... Figure 2 As shown in the figure, this application provides a seamless construction system for ultra-long reinforced concrete structures, the system comprising: The target structural region identification module 10 is used to determine the structural length of ultra-long reinforced concrete structures. When the unidirectional length of the structure exceeds a preset seamless control length threshold, the target structural region is identified. The deformation analysis module 20 is used to analyze the structural shrinkage deformation and temperature deformation of the target structural region to determine the target expansion reinforcement zone. The mix proportion determination module 30 is used to determine the target concrete mix proportion decision based on the structural design requirements and concrete mix proportion characteristics in the target expansion reinforcement zone. The target concrete mix proportion decision has an expansion agent dosage indicator. The seamless continuous construction module 40 is used to monitor the construction status of each construction section in real time after pouring the compensation shrinkage concrete for the target expansion reinforcement zone according to the target concrete mix proportion decision. It provides feedback to adjust the expansion agent dosage and pouring sequence, and completes seamless continuous construction by alternately pouring the inner and outer concrete of the target expansion reinforcement zone.

[0055] Furthermore, the target structure region identification module 10 is used to perform the following operation steps: Obtain the foundation structural information of the ultra-long reinforced concrete structure, wherein the foundation structural information includes the structural plan dimensions, structural system type, and floor height parameters; based on the structural system type and floor height parameters, match the concrete structure design code to determine the preset seamless control length threshold; obtain the unidirectional length of the structure based on the structural plan dimensions, and when the unidirectional length of the structure is greater than the preset seamless control length threshold, identify the target structural area.

[0056] Furthermore, the deformation analysis module 20 is used to perform the following operation steps: Based on the unidirectional length of the structure and the concrete structure design specifications, the ultra-long reinforced concrete structure is divided into multiple continuous calculation segments along its length. Based on the changes in the elastic modulus of concrete at different ages, the autogenous shrinkage strain and drying shrinkage strain of each continuous calculation segment are calculated, obtaining a set of shrinkage deformation data for each continuous calculation segment at different ages. Based on the changes in ambient temperature and concrete pouring temperature during construction, as well as preset constraint conditions, a set of temperature stress distributions generated during construction and hardening of each continuous calculation segment is calculated. Based on the shrinkage deformation data set and the temperature stress distribution set, combined with structural boundary conditions and external constraint coefficients, the tensile edge stress distribution is calculated, and crack width is verified to identify high-risk crack areas. Based on the tensile edge stress distribution and the high-risk crack areas, target expansion reinforcement strips are continuously arranged along the length, and the reinforcement strip arrangement parameters are determined, including width and local thickness.

[0057] Furthermore, the deformation analysis module 20 is used to perform the following operation steps: Obtain the structural geometry, reinforcement layout parameters, concrete strength grade, and design constraints of the ultra-long reinforced concrete structure, and establish a target structure calculation model; substitute the reinforcement strip layout parameters into the target structure calculation model, calculate the simulated tensile stress of each continuous calculation segment, and verify whether it meets the preset crack control standard; if it does not meet the standard, perform feedback iterative optimization of the reinforcement strip layout parameters based on the simulated tensile stress until the preset crack control standard is met.

[0058] Furthermore, the mix proportion decision determination module 30 is used to perform the following operation steps: Based on the structural design requirements and concrete mix proportion characteristics, the shrinkage-compensating concrete to be optimized is determined; the workability constraints of the shrinkage-compensating concrete to be optimized are obtained, including slump, fluidity, compressive strength, and expansion properties; based on the concrete mix proportion characteristics and the workability constraints, a concrete mixing control molecular space is constructed, and the performance of the concrete mixing control molecules is verified through a mixing control performance verification chain to generate a target concrete mix proportion decision.

[0059] Furthermore, the mix proportion decision determination module 30 is used to perform the following operation steps: The concrete mixing process is divided into K mixing control stages, and data mining is performed on each mixing control stage to generate K mixing control domains. Multiple mixing control atoms are randomly combined within the K mixing control domains to form multiple mixing control molecules, which are then added to the concrete mixing control molecule space. A mixing control performance verification chain is constructed based on the performance constraints, including performance verification nodes corresponding to each performance index. Iterative optimization is performed within the concrete mixing control molecule space to select the target concrete mix proportion decision that satisfies all performance verification nodes, and the dosage of the expansion agent is determined.

[0060] Furthermore, concrete mixing and pouring are carried out according to the target concrete mix design, and internal prestress is established in the target expansion reinforcement zone during the construction and hardening stages to compensate for shrinkage deformation.

[0061] Furthermore, the seamless continuous construction module 40 is used to perform the following operation steps: Double-layered dense wire mesh is installed on both sides of the target expansion reinforcement strip to define and isolate the area inside and outside the expansion reinforcement strip; a layered pouring control mechanism is set, including: S1: pouring high-content compensating shrinkage concrete in the area inside the expansion reinforcement strip; S2: before the concrete in the area inside the expansion reinforcement strip reaches the initial setting state or when a preset time window is reached, pouring ordinary compensating shrinkage concrete in the area outside the expansion reinforcement strip; based on the layered pouring control mechanism, continuous vibration and soft joint control are performed.

[0062] Furthermore, in the layered pouring control mechanism, the time interval between the alternating pouring of S1 and S2 does not exceed the preset soft joint control time threshold.

[0063] Through the foregoing detailed description of a seamless construction method for an ultra-long reinforced concrete structure, those skilled in the art can clearly understand the seamless construction system for an ultra-long reinforced concrete structure in this embodiment. Since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and relevant parts can be referred to in the method section.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A seamless construction method of an ultra-long reinforced concrete structure, characterized by, The method comprises: Perform structural length discrimination on the super-long reinforced concrete structure, and when the one-way length of the structure is greater than a preset seamless control length threshold, identify a target structure region; Perform structural shrinkage deformation and temperature deformation analysis on the target structure region to determine a target expansion reinforcement zone; In the target expansion reinforcement zone, determine a target concrete mix ratio decision according to the structural design requirements and the concrete mix ratio characteristics, wherein the target concrete mix ratio decision has an expansion agent content identifier; After pouring the compensating shrinkage concrete of the target expansion reinforcement zone according to the target concrete mix ratio decision, monitor the construction state of each construction section in real time, feed back and adjust the expansion agent content and the pouring sequence, and complete the seamless continuous construction by alternately pouring the inner and outer concrete of the target expansion reinforcement zone.

2. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 1, wherein, Perform structural length discrimination on the super-long reinforced concrete structure, and when the one-way length of the structure is greater than a preset seamless control length threshold, identify a target structure region, comprising: Obtain the basic structure information of the super-long reinforced concrete structure, wherein the basic structure information comprises the structure plane size, the structure system type and the floor height parameter; According to the structure system type and the floor height parameter, match the concrete structure design specification to determine the preset seamless control length threshold; According to the structure plane size, obtain the one-way length of the structure, and when the one-way length of the structure is greater than the preset seamless control length threshold, identify a target structure region.

3. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 2, wherein, Perform structural shrinkage deformation and temperature deformation analysis on the target structure region to determine a target expansion reinforcement zone, comprising: Based on the one-way length of the structure and the concrete structure design specification, divide the super-long reinforced concrete structure into a plurality of continuous calculation sections along the length direction; According to the change of the elastic modulus of concrete at each age, calculate the self-shrinkage strain and the dry shrinkage strain of each continuous calculation section to obtain a shrinkage deformation data set of each continuous calculation section at different ages; According to the environmental temperature change and the concrete pouring temperature during construction, as well as the preset constraint condition, calculate a temperature stress distribution set generated by each continuous calculation section during construction and hardening process; According to the shrinkage deformation data set and the temperature stress distribution set, calculate the tensile edge stress distribution in combination with the structure boundary condition and the external constraint coefficient, and perform crack width checking to identify a high-risk crack region; According to the tensile edge stress distribution and the high-risk crack region, continuously arrange a target expansion reinforcement zone along the length direction, and determine a reinforcement zone arrangement parameter, wherein the reinforcement zone arrangement parameter comprises the width and the local thickness.

4. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 3, wherein, Further comprising: Obtain the structure geometric size, the steel reinforcement arrangement parameter, the concrete strength grade and the design constraint condition of the super-long reinforced concrete structure to establish a target structure calculation model; Substitute the reinforcement zone arrangement parameter into the target structure calculation model to calculate the simulated tensile stress of each continuous calculation section, and verify whether the preset crack control standard is met; If not, iteratively optimize the reinforcement zone arrangement parameter according to the simulated tensile stress until the preset crack control standard is met.

5. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 1, wherein, In the target expansion reinforcement zone, a target concrete mix ratio decision is determined according to structural design requirements and concrete mix ratio characteristics, including: According to the structural design requirements and the concrete mix ratio characteristics, the shrinkage-compensating concrete to be optimized is determined; Obtain the working performance constraints of the shrinkage-compensating concrete to be optimized, including slump, fluidity, compressive strength and expansion performance; According to the concrete mix ratio characteristics and the working performance constraints, a concrete mixing control molecular space is constructed, and the performance of the concrete mixing control molecule is verified through a mixing control performance verification chain to generate a target concrete mix ratio decision.

6. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 5, wherein, Including: Divide the concrete mixing process into K mixing control stages, and perform data mining on each mixing control stage to generate K mixing control domains; Randomly combine the K mixing control domains to obtain a plurality of mixing control atoms, forming a plurality of mixing control molecules, and adding the plurality of mixing control molecules to the concrete mixing control molecular space; Based on the working performance constraints, a mixing control performance verification chain is constructed, including performance verification nodes corresponding to each performance index; Iterative optimization is performed in the concrete mixing control molecular space, and a target concrete mixing control molecule that satisfies all performance verification nodes is selected as the target concrete mix ratio decision, and the expansion agent content is determined.

7. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 6, wherein, According to the target concrete mix ratio decision, concrete is mixed and poured, and internal pre-stress is established in the target expansion reinforcement zone during construction and hardening to compensate for shrinkage deformation.

8. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 1, wherein, Also includes: Double-layer dense mesh steel wire nets are arranged on both sides of the target expansion reinforcement zone to define an inner area of the expansion reinforcement zone and an outer area of the expansion reinforcement zone; Set a layered pouring control mechanism, including: S1: Pour high-content shrinkage-compensating concrete in the inner area of the isolated expansion reinforcement zone; S2: Pour ordinary shrinkage-compensating concrete in the outer area of the expansion reinforcement zone before the inner area of the isolated expansion reinforcement zone reaches the initial setting state of the concrete or within a preset time window; Based on the layered pouring control mechanism, continuous vibration and soft joint control are performed.

9. A method of seamless construction of an ultra-long reinforced concrete structure as claimed in claim 8, wherein, In the layered pouring control mechanism, the alternating pouring time interval of S1 and S2 does not exceed the preset soft joint control time threshold.

10. A seamless construction system for super-long reinforced concrete structures, characterized in that, A seamless construction method for a super-long reinforced concrete structure according to any one of claims 1-9, the system comprising: A target structure area identification module for identifying the length of the super-long reinforced concrete structure, and identifying a target structure area when the one-way length of the structure is greater than a preset seamless control length threshold; A deformation analysis module for analyzing the structural shrinkage deformation and temperature deformation of the target structure area to determine a target expansion reinforcement zone; A mix ratio decision determination module for determining a target concrete mix ratio decision in the target expansion reinforcement zone according to structural design requirements and concrete mix ratio characteristics, wherein the target concrete mix ratio decision has an expansion agent content identifier; The seamless continuous construction module is used for monitoring the construction state of each construction section in real time after the compensation shrinkage concrete pouring of the target expansion reinforcing belt according to the target concrete mixing proportion decision, feeding back and adjusting the expansion agent content and the pouring sequence, and completing the seamless continuous construction by alternately pouring the inner and outer concrete of the target expansion reinforcing belt.

Images