Integrated Design Method for Prefabricated Existing Buildings

Abstract

The present invention relates to the field of architectural design and discloses an assembled integrated design method for existing buildings, which is used to solve the problem that when the building structure changes, the instability of the building will be increased according to the previous design scheme. The method includes collecting environmental data of the existing building, calculating a geological condition change coefficient based on the existing building environmental data, collecting aging conditions of the existing building, calculating a building aging coefficient based on the aging conditions, obtaining salt spray corrosion information of the existing building exterior wall, and calculating a corrosion coefficient based on the salt spray corrosion information, calculating a building structure change index based on the geological condition change coefficient, the building aging coefficient and the corrosion coefficient, judging changes to the original integrated design based on the building structure change index, re-structuring the existing building using BIM technology, and re-designing the assembled integrated design, thereby effectively improving the stability and durability of the building.

Description

Technical Field

[0001] The present invention relates to the field of architectural design, and more particularly to an integrated design method for prefabricated buildings. Background Art

[0002] Existing buildings are buildings that have already been built and put into use. They can also be referred to as existing buildings, older buildings, or existing stock buildings. Unlike new construction, existing buildings have already been designed, constructed, serviced, and functionally maintained, and may have already been in use for some time. Existing buildings may face issues such as maintenance, renovation, functional transformation, and energy-saving retrofits. In particular, over time, some buildings may no longer meet modern standards for functionality, energy efficiency, and safety, necessitating renovation and upgrading.

[0003] The existing prefabricated integrated design for existing buildings is a design approach specifically designed for the renovation and upgrading of existing, older structures. It utilizes the concept of prefabricated construction, modularizing and prefabricating building components (such as walls, roofs, piping, and trim) and then assembling them on-site like building blocks. However, existing buildings can be affected by external factors, causing structural changes. Continuing with this design approach could increase building instability and reduce durability.

[0004] In view of the above problems, the present invention proposes a solution. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an existing building assembly integrated design method to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The integrated design method for prefabricated existing buildings includes the following steps:

[0008] Step 1: Collect existing building environmental data, including groundwater level changes and soil changes;

[0009] Step 2: Calculate the soil change degree and water level change degree based on the existing building environment data, and calculate the geological condition change coefficient based on the soil change degree and water level change degree. The calculation formula is: , where GC is the geological condition variation coefficient, It is expressed as the degree of water level change, and SL is expressed as the degree of soil change;

[0010] Step 3: Collect the aging conditions of existing buildings, including the building construction years and historical maintenance times, and calculate the building aging coefficient based on the aging conditions;

[0011] Step 4: Obtain salt spray corrosion information of the existing building exterior wall and calculate the corrosion coefficient based on the salt spray corrosion information;

[0012] Step 5: Calculate the building structure change index based on the geological condition change coefficient, building aging coefficient, and corrosion coefficient. The calculation formula is: , where SC represents the building structure change index, GC represents the geological condition change coefficient, BA represents the building aging coefficient, a1, a2, and a3 are the weight coefficients of the geological condition change coefficient, building aging coefficient, and corrosion coefficient;

[0013] Step 6: Determine changes to the original integrated design based on the building structure change index. If changes to the integrated design are necessary, use BIM technology to re-inspect the structure of the existing building and implement an assembled integrated design based on the inspected structure.

[0014] The steps for calculating the building aging coefficient according to the aging situation are as follows:

[0015] Obtain the standard service life of existing buildings and the maximum number of maintenance times;

[0016] The building aging coefficient is calculated based on the aging situation, and its calculation formula is: , where BA is the building aging coefficient, A is the building construction years, L is the standard service life of the building, W is the number of historical maintenance times, and W max Expressed as the maximum number of maintenance times for the building;

[0017] The steps of obtaining salt spray corrosion information of the exterior wall of an existing building and calculating the corrosion coefficient based on the salt spray corrosion information are as follows:

[0018] Use ultrasonic thickness gauge to measure the corrosion depth of exterior wall materials;

[0019] Obtain salt spray concentration in the air near existing buildings through meteorological monitoring equipment;

[0020] Record the time the building is exposed to the salt spray environment as corrosion time;

[0021] The corrosion coefficient is calculated based on the corrosion depth, salt spray concentration and corrosion time. The calculation formula is: , where CS is the corrosion coefficient, D is the corrosion depth, C is the corrosion time, and S is the smoke concentration.

[0022] Preferably, the step of collecting existing building environment data is:

[0023] Water level monitoring equipment is installed in the detection wells around the existing buildings. The water level information detected by each water level monitoring device is obtained and the average water level information is calculated and recorded as the current water level.

[0024] Use a portable soil moisture meter to detect current soil moisture data;

[0025] The pressure sensor is buried in the target soil layer area and the current soil layer pressure data of the soil layer near the existing building is detected by the pressure sensor.

[0026] Preferably, the step of calculating the soil change degree and the water level change degree based on the existing building environment data is:

[0027] The water level data of the existing building during construction is obtained through historical construction archives and recorded as historical water level. The degree of water level change is calculated based on the current water level and the historical water level. The calculation formula is: ,in It is expressed as the degree of water level change, H2 represents the current water level, and H1 represents the historical water level;

[0028] The soil moisture data of the existing building during construction is obtained through historical construction archives and recorded as historical humidity. The degree of soil moisture change is calculated based on the current humidity and historical humidity. The calculation formula is: ,in It represents the degree of change in soil moisture, M2 represents the current humidity, and M1 represents the historical humidity;

[0029] The soil pressure data of existing buildings during construction is obtained through historical construction archives and recorded as historical soil pressure. The degree of soil pressure change is calculated based on the current soil pressure and the historical soil pressure. The calculation formula is: ,in It is expressed as the degree of change of soil layer pressure, P2 is the current soil layer pressure, and P1 is the historical soil layer pressure;

[0030] The water level change degree, soil moisture change degree and soil layer pressure change degree are normalized, and the soil change degree is calculated based on the soil moisture change degree and soil layer pressure change degree. The calculation formula is: , where SL represents the soil variability, It is expressed as the degree of soil moisture change. It is expressed as the degree of change of soil pressure.

[0031] Preferably, the step of measuring the corrosion depth of the exterior wall material using an ultrasonic thickness gauge is:

[0032] Divide the building's exterior wall into n areas, recorded as sub-areas, and apply an appropriate amount of ultrasonic coupling agent between the ultrasonic thickness gauge probe and the surface to be measured;

[0033] Place the ultrasonic thickness gauge probe vertically at the center of the sub-area;

[0034] Press the measuring button, observe and record the thickness value displayed on the instrument;

[0035] The thickness values displayed by the instrument in each sub-area were averaged to obtain the average thickness value, which was recorded as the corrosion depth.

[0036] Preferably, the step of judging the change of the integrated design according to the building structure change index is:

[0037] The building structure change index is compared with the preset threshold. If the building structure change index is less than the preset threshold, it is determined that the structural change of the current existing building is small and the original integrated design does not need to be changed; if the building structure change index is greater than the preset threshold, it is determined that the structural change of the current existing building is large and the original integrated design needs to be changed.

[0038] The technical effects and advantages of the present invention are as follows:

[0039] Collect existing building environmental data, calculate the geological condition change coefficient based on the existing building environmental data, collect the aging conditions of existing buildings, calculate the building aging coefficient based on the aging conditions, obtain salt spray corrosion information on the exterior walls of existing buildings, and calculate the corrosion coefficient based on the salt spray corrosion information, calculate the building structure change index based on the geological condition change coefficient, the building aging coefficient and the corrosion coefficient, judge the changes to the original integrated design based on the building structure change index, use BIM technology to re-inspect the structure of the existing buildings, and re-design the prefabricated integrated design, which effectively improves the stability and durability of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is the overall flow chart of the present invention. DETAILED DESCRIPTION

[0041] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The existing building prefabricated integrated design method involved in the present invention is not limited to the various structures described in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] The present invention provides an integrated design method for an existing building assembly, comprising the following steps:

[0043] Step 1: Collect existing building environmental data, including groundwater level changes and soil changes;

[0044] In this embodiment, it should be specifically explained that the steps of collecting existing building environment data are:

[0045] Water level monitoring equipment is installed in the detection wells around the existing buildings. The water level information detected by each water level monitoring device is obtained and the average water level information is calculated and recorded as the current water level.

[0046] A test well is a facility specifically designed to monitor environmental data such as groundwater levels, soil moisture, and permeability. It is typically a vertical well-shaped structure, with a depth and diameter set according to monitoring requirements. Test wells are independently located around buildings or in areas requiring monitoring, extending deep into the subsoil. By installing water level monitoring equipment, such as water level sensors or data loggers, in the test wells, changes in the groundwater level can be continuously monitored. They are widely used in environmental protection, geological surveys, groundwater management, and construction projects to understand groundwater dynamics and assess their impact on building foundations.

[0047] Use a portable soil moisture meter to monitor current soil moisture. This lightweight instrument is used to quickly measure soil moisture content and is widely used in agriculture, horticulture, and environmental monitoring. It typically consists of a probe, display, and data logging function. By inserting it into the soil and reading the moisture level, it helps users understand soil moisture conditions in real time, enabling them to optimize irrigation management and soil care.

[0048] The pressure sensor is buried in the target soil layer area, which can represent the pressure situation of the soil layer around the current building. The pressure sensor is used to detect the current soil layer pressure data of the soil layer near the existing building.

[0049] Pressure sensors are devices used to measure the pressure of liquids or gases and are widely used in fields such as soil engineering, building monitoring, and environmental monitoring. When detecting soil pressure, pressure sensors can sense changes in the applied pressure in the soil and convert them into electrical or digital signals for real-time monitoring and recording. These sensors typically have high precision and stability, and can operate reliably under various environmental conditions. By burying pressure sensors in the soil, users can obtain current soil pressure data, helping to assess the soil's bearing capacity and the safety of buildings.

[0050] Step 2: Calculate the geological condition variation coefficient based on existing building environment data;

[0051] In this embodiment, it should be specifically explained that the step of calculating the geological condition variation coefficient based on the existing building environment data is as follows:

[0052] The water level data of the existing building during construction is obtained through historical construction archives and recorded as historical water level. The degree of water level change is calculated based on the current water level and the historical water level. The calculation formula is: ,in It is expressed as the degree of water level change, H2 represents the current water level, and H1 represents the historical water level;

[0053] The soil moisture data of the existing building during construction is obtained through historical construction archives and recorded as historical humidity. The degree of soil moisture change is calculated based on the current humidity and historical humidity. The calculation formula is: ,in It represents the degree of change in soil moisture, M2 represents the current humidity, and M1 represents the historical humidity;

[0054] The soil pressure data of existing buildings during construction is obtained through historical construction archives and recorded as historical soil pressure. The degree of soil pressure change is calculated based on the current soil pressure and the historical soil pressure. The calculation formula is: ,in It is expressed as the degree of change of soil layer pressure, P2 is the current soil layer pressure, and P1 is the historical soil layer pressure;

[0055] The water level change degree, soil moisture change degree and soil layer pressure change degree are normalized, and the soil change degree is calculated based on the soil moisture change degree and soil layer pressure change degree. The calculation formula is: , where SL represents the soil variability, It is expressed as the degree of soil moisture change. It is expressed as the degree of soil pressure change;

[0056] The geological condition variation coefficient is calculated based on the soil variation and water level variation, and its calculation formula is: , where GC is the geological condition variation coefficient, It is expressed as the degree of water level change, and SL is expressed as the degree of soil change.

[0057] Normalization involves scaling numerical data of varying dimensions and ranges to the same scale (typically between 0 and 1) through mathematical transformations to facilitate consistent comparison and analysis. When dealing with changes in water level, soil moisture, and soil pressure, since these parameters can have widely varying units and ranges, normalization allows them to be presented on the same scale, preventing any one parameter from dominating or being overlooked in a comprehensive analysis due to excessively large or small values.

[0058] Normalization allows different parameters to be calculated and weighed on the same scale, avoiding bias caused by different dimensions. In multi-factor comprehensive assessments, such as analyzing the impact of water level changes, soil moisture changes, and soil pressure changes on building structures, normalization ensures that each factor plays an equal role in the calculation model, leading to more scientific and reasonable conclusions.

[0059] By quantifying changes in geological conditions, potential safety hazards can be identified promptly. For example, a sudden rise in water levels can cause soil saturation, increasing the risk of landslides or foundation settlement. This helps engineers implement appropriate reinforcement and maintenance measures early to ensure building safety. Calculating the coefficient of geological condition variation helps assess the safety of buildings and their surroundings. By monitoring changes in water levels, soil moisture, and soil pressure, potential risks such as foundation instability, landslides, or settlement can be identified promptly, thus ensuring the safety of buildings. Analyzing changes in geological conditions allows for better development and optimization of building maintenance and repair strategies. For example, targeted maintenance measures tailored to soil moisture or water level changes in specific areas can help extend the building's service life and reduce maintenance costs.

[0060] Step 3: Collect the aging conditions of existing buildings, including the building construction years and historical maintenance times, and calculate the building aging coefficient based on the aging conditions;

[0061] In this embodiment, it should be specifically explained that the steps of calculating the building aging coefficient according to the aging condition are as follows:

[0062] Obtain the standard service life of existing buildings, which is usually determined by the building's design life or industry standards, in years;

[0063] Obtain the maximum number of maintenance times for a building. The maximum number of maintenance times refers to the maximum number of maintenance times that can theoretically be accepted within the design life of such a building, which depends on the building materials, design, and environmental conditions.

[0064] The building aging coefficient is calculated based on the aging situation, and its calculation formula is: , where BA is the building aging coefficient, A is the building construction years, L is the standard service life of the building, W is the number of historical maintenance times, and W max Expressed as the maximum number of maintenance times for the building.

[0065] Step 4: Obtain salt spray corrosion information of the existing building exterior wall and calculate the corrosion coefficient based on the salt spray corrosion information;

[0066] Salt spray corrosion commonly occurs in coastal areas, primarily due to high concentrations of salt in the air, particularly sodium chloride (NaCl) particles. These salts enter the air through wind, tides, and seawater evaporation, forming salt spray. In a humid environment, chloride ions in the salt spray adhere to the surfaces of building materials, particularly reinforced concrete and metal components, prompting electrochemical reactions. The moisture provides an electrolyte environment, causing oxidation reactions on the rebar or metal components, leading to rust. Chloride ions also penetrate the concrete cover, exposing the rebar and accelerating corrosion, ultimately causing material degradation and structural failure.

[0067] Salt spray corrosion can cause structural changes in coastal areas, primarily due to chloride ions in the salt spray penetrating the concrete and corroding the steel bars, causing them to rust and expand. The increased volume of the corroded steel bars generates internal stresses that cause cracking and spalling in the concrete, further exposing more steel and accelerating the corrosion process. This cycle weakens the building's bearing capacity and structural integrity, reducing the strength and durability of building materials, and ultimately causing structural deformation, cracks, or localized instability.

[0068] In this embodiment, it should be specifically explained that the steps of obtaining salt spray corrosion information of the exterior wall of an existing building and calculating the corrosion coefficient based on the salt spray corrosion information are as follows:

[0069] The corrosion depth of exterior wall materials was measured using an ultrasonic thickness gauge. This instrument is used for non-destructive material thickness measurement, utilizing the principle of high-frequency sound waves propagating through the material. When ultrasonic waves are emitted from a probe and encounter an interface within the material, some of the sound waves are reflected back to the probe. By calculating the propagation time and speed of the sound waves, the instrument can accurately determine the material's thickness. This device is widely used in construction, manufacturing, and maintenance, and is particularly suitable for detecting the corrosion depth of metals and composite materials. It offers advantages such as high accuracy, portability, and ease of operation.

[0070] Meteorological monitoring equipment is used to collect and analyze environmental meteorological data, enabling real-time monitoring of various meteorological parameters, including temperature, humidity, wind speed, precipitation, and airborne salt spray concentration. Dedicated salt spray monitors or weather stations can sample and analyze the number and distribution of salt particles in the air to assess the potential impact of salt spray on the environment and buildings. These devices typically feature automated data collection, wireless transmission, and data storage, facilitating long-term monitoring and analysis, providing a scientific basis for building maintenance and environmental protection.

[0071] Record the time the building is exposed to the salt spray environment as the corrosion time, usually the building's construction years;

[0072] The corrosion coefficient is calculated based on the corrosion depth, salt spray concentration and corrosion time. The calculation formula is: , where CS is the corrosion coefficient, D is the corrosion depth, C is the corrosion time, and S is the smoke concentration.

[0073] In this embodiment, it should be specifically explained that the steps of measuring the corrosion depth of the exterior wall material using an ultrasonic thickness gauge are as follows:

[0074] Divide the building's exterior wall into n evenly spaced areas, each designated as a sub-area. Apply an appropriate amount of ultrasonic coupling agent (such as coupling glue or water) between the ultrasonic thickness gauge probe and the surface to be measured to facilitate acoustic wave transmission. The coupling agent helps eliminate the effects of air bubbles and surface roughness on measurement.

[0075] Place the ultrasonic thickness gauge probe vertically at the center of the sub-area, ensuring good contact between the probe and the exterior wall material to avoid tilting or loosening;

[0076] Press the measurement button, the ultrasonic thickness gauge will automatically send out sound waves and receive reflected signals, and then observe and record the thickness value displayed on the instrument;

[0077] The thickness values displayed by the instrument in each sub-area are averaged to obtain the average thickness value, which is recorded as the corrosion depth. The calculation formula is: , where D is the corrosion depth, D i is the thickness value of the i-th sub-region, and n is the number of sub-regions.

[0078] Step 5: Calculate the building structure change index based on the geological condition change coefficient, building aging coefficient, and corrosion coefficient. The calculation formula is: SC represents the building structure change index, and GC represents the geological condition change coefficient. As geological conditions change (such as changes in foundation soil properties, groundwater level fluctuations, and seismic activity), the stability and integrity of building structures will also change accordingly. When geological conditions fluctuate significantly, the stress, settlement, and deformation experienced by the building structure will become more pronounced, potentially leading to cracks, tilting, and even partial failure. This relationship indicates that the more severe the geological fluctuations, the greater the stress response and changes in the building structure. Therefore, in complex geological environments, special attention must be paid to structural design and foundation treatment to minimize the impact of geological changes on building safety. BA represents the building aging coefficient. As a building ages, the degree of structural change and deterioration gradually increases. Building aging is typically manifested as a decline in material properties, such as concrete carbonization, steel corrosion, and deterioration of sealing materials. As aging progresses, the building's load-bearing capacity, stability, and seismic resistance decrease. This proportional relationship indicates that the longer a building is in service, the greater the cumulative impact of factors such as the natural environment, climate conditions, and operational loads, and the more pronounced structural changes such as cracks, deformation, and settlement become. Therefore, aging buildings need regular maintenance and reinforcement to avoid serious structural problems and safety hazards. CS is expressed as the corrosion coefficient. As the degree of corrosion of building materials increases, the changes and damage to the structure also increase accordingly. Corrosion usually occurs in building materials such as metals and reinforced concrete, and is affected by environmental factors such as salt spray, moisture, acid rain, etc. As corrosion worsens, the cross-section of steel bars or metal components decreases, and the strength and bearing capacity decrease, leading to cracks, deformation, insufficient bearing capacity and other problems in the building. This proportional relationship shows that corrosion is a key factor affecting the stability and safety of building structures. The higher the degree of corrosion, the faster the structure deteriorates, which may eventually lead to structural failure. Therefore, timely anti-corrosion measures and maintenance are crucial to extending the life of buildings. a1, a2, and a3 are the weight coefficients of the geological condition variation coefficient, the building aging coefficient, and the corrosion coefficient, and , the specific values of a1, a2, and a3 are determined by professionals according to actual conditions. For example, a1, a2, and a3 can be 0.4, 0.4, and 0.2;

[0079] Step 6: Determine the changes to the original integrated design based on the building structure change index. If it is determined that changes to the integrated design are necessary, use BIM technology to re-inspect the structure of the existing building and conduct an assembled integrated design based on the inspected structure.

[0080] In this embodiment, it should be specifically explained that the steps of determining the change of the integrated design according to the building structure change index are:

[0081] The building structure change index is compared with the preset threshold. If the building structure change index is less than the preset threshold, it is determined that the structural change of the current existing building is small and the original integrated design does not need to be changed; if the building structure change index is greater than the preset threshold, it is determined that the structural change of the current existing building is large and the original integrated design needs to be changed.

[0082] The Building Structural Change Index provides a quantitative indicator that can help identify potential safety hazards in buildings due to aging, damage, or environmental changes. Regular monitoring of the change index allows timely measures to ensure building safety. Analysis of the building structural change index provides a scientific basis for building maintenance and repair, enabling the development of more effective maintenance plans. This helps prevent potential problems before they escalate, extending the building's service life. Regular assessment of structural changes can optimize resource efficiency, reduce material waste, and promote sustainable development in the construction industry. The building structural change index dynamically reflects the health of a building, effectively identifying and assessing potential risks and enhancing resilience to natural disasters such as earthquakes and floods.

[0083] BIM technology enables the acquisition of detailed three-dimensional models and data of existing buildings, including their structure, materials, and various properties, ensuring a comprehensive and accurate assessment of their current status. This helps identify potential structural issues and the extent of aging. Using BIM technology, design plans can be quickly modified, and the impact of changes on the overall structure can be viewed in real time. This efficient iterative process helps the design team select the optimal solution from different options, reducing the probability of design errors. BIM-based prefabricated integrated design enables the prefabrication and on-site assembly of structural modules, reducing construction time and costs and improving construction quality and efficiency. This approach is particularly suitable for complex construction projects and can effectively reduce the complexity and risks of on-site construction.

[0084] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0085] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. The existing building assembly integrated design method is characterized by: The following steps are involved: Step 1: Collect existing building environmental data, including groundwater level changes and soil changes; Step 2: Calculate the soil change degree and water level change degree based on the existing building environment data, and calculate the geological condition change coefficient based on the soil change degree and water level change degree. The calculation formula is: , where GC is the geological condition variation coefficient, It is expressed as the degree of water level change, and SL is expressed as the degree of soil change; Step 3: Collect the aging conditions of existing buildings, including the building construction years and historical maintenance times, and calculate the building aging coefficient based on the aging conditions; Step 4: Obtain salt spray corrosion information of the existing building exterior wall and calculate the corrosion coefficient based on the salt spray corrosion information; Step 5: Calculate the building structure change index based on the geological condition change coefficient, building aging coefficient, and corrosion coefficient. The calculation formula is: , where SC represents the building structure change index, GC represents the geological condition change coefficient, BA represents the building aging coefficient, a1, a2, and a3 are the weight coefficients of the geological condition change coefficient, building aging coefficient, and corrosion coefficient; Step 6: Determine changes to the original integrated design based on the building structure change index. If changes to the integrated design are necessary, use BIM technology to re-inspect the structure of the existing building and implement an assembled integrated design based on the inspected structure. The steps for calculating the building aging coefficient according to the aging situation are as follows: Obtain the standard service life of existing buildings and the maximum number of maintenance times; The building aging coefficient is calculated based on the aging situation, and its calculation formula is: , where BA is the building aging coefficient, A is the building construction age, L is the standard service life of the building, W is the number of historical maintenance times, and W max Expressed as the maximum number of maintenance times for the building; The steps of obtaining salt spray corrosion information of the exterior wall of an existing building and calculating the corrosion coefficient based on the salt spray corrosion information are as follows: Use ultrasonic thickness gauge to measure the corrosion depth of exterior wall materials; Obtain salt spray concentration in the air near existing buildings through meteorological monitoring equipment; Record the time the building is exposed to the salt spray environment as corrosion time; The corrosion coefficient is calculated based on the corrosion depth, salt spray concentration and corrosion time. The calculation formula is: , where CS is the corrosion coefficient, D is the corrosion depth, C is the corrosion time, and S is the smoke concentration.

2. The method for integrated design of prefabricated buildings according to claim 1, characterized in that: The steps for collecting existing building environment data are: Water level monitoring equipment is installed in the detection wells around the existing buildings. The water level information detected by each water level monitoring device is obtained and the average water level information is calculated and recorded as the current water level. Use a portable soil moisture meter to detect current soil moisture data; The pressure sensor is buried in the target soil layer area and the current soil layer pressure data of the soil layer near the existing building is detected by the pressure sensor.

3. The method for integrated design of prefabricated buildings according to claim 1, characterized in that: The steps of calculating the soil change degree and the water level change degree based on the existing building environment data are as follows: The water level data of the existing building during construction is obtained through historical construction archives and recorded as historical water level. The degree of water level change is calculated based on the current water level and the historical water level. The calculation formula is: , which indicates is the degree of water level change, H2 represents the current water level, and H1 represents the historical water level; The soil moisture data of the existing building during construction is obtained through historical construction archives and recorded as historical humidity. The degree of soil moisture change is calculated based on the current humidity and historical humidity. The calculation formula is: ,in It represents the degree of change in soil moisture, M2 represents the current humidity, and M1 represents the historical humidity; The soil pressure data of existing buildings during construction is obtained through historical construction archives and recorded as historical soil pressure. The degree of soil pressure change is calculated based on the current soil pressure and the historical soil pressure. The calculation formula is: ,in It is expressed as the degree of change of soil layer pressure, P2 is the current soil layer pressure, and P1 is the historical soil layer pressure; The water level change degree, soil moisture change degree and soil layer pressure change degree are normalized, and the soil change degree is calculated based on the soil moisture change degree and soil layer pressure change degree. The calculation formula is: , where SL represents the soil variability, indicating is the degree of soil moisture change, indicating is the degree of soil pressure change.

4. The method for integrated design of prefabricated buildings according to claim 1, characterized in that: The steps of measuring the corrosion depth of the exterior wall material using an ultrasonic thickness gauge are as follows: Divide the building's exterior wall into n areas, recorded as sub-areas, and apply an appropriate amount of ultrasonic coupling agent between the ultrasonic thickness gauge probe and the surface to be measured; Place the ultrasonic thickness gauge probe vertically at the center of the sub-area; Press the measuring button, observe and record the thickness value displayed on the instrument; The thickness values displayed by the instrument in each sub-area were averaged to obtain the average thickness value, which was recorded as the corrosion depth.

5. The method for integrated design of prefabricated buildings according to claim 1, characterized in that: The steps for judging the changes of the integrated design according to the building structure change index are as follows: Compare the building structure change index with the preset threshold. If the building structure change index is less than the preset threshold, it is determined that the structural change of the existing building is small and no changes to the original integrated design are required. If the building structure change index is greater than the preset threshold, it is determined that the structure of the current existing building has changed significantly and the original integrated design needs to be changed.

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