A method and system for accounting for carbon emissions in the construction interruption of a tropical fabricated building

Abstract

The application discloses a tropical fabricated building construction interruption carbon emission accounting method and system, and the method comprises the following steps: obtaining an interruption trigger signal of a construction site, determining a period from when the interruption trigger signal meets a preset interruption condition to when the interruption trigger signal meets a preset resumption condition as an interruption event; determining the dependency relationship between each construction process, determining a construction process that falls into the interruption event and stops work due to bad weather as an active interruption process, determining a construction process that precedes the active interruption process and has completed work as a passive maintenance process, calculating passive maintenance carbon emissions generated by the passive maintenance process during the waiting period for the active interruption process to resume, and the accounting duration of the passive maintenance carbon emissions is the duration between the time when the active interruption process stops work and the time when the active interruption process resumes work; summing the passive maintenance carbon emissions and the carbon emissions of the remaining construction processes to obtain the total carbon emissions of the construction stage.

Description

Technical Field

[0001] This invention relates to the field of building carbon emission accounting technology, specifically to a method and system for calculating carbon emissions during construction interruptions in tropical prefabricated buildings. Background Technology

[0002] In the engineering practice of prefabricated buildings in tropical and subtropical monsoon climate zones, extreme weather such as typhoons, rainstorms, and severe convection frequently occur during the flood season, which can trigger graded warnings from meteorological departments, forcing the construction process to be suspended and resumed.

[0003] Existing carbon emission accounting technologies for building construction can be broadly categorized into two types. The first type uses the activity volume of a single construction process as the accounting unit. Based on a pre-set carbon emission factor, it converts the energy and material consumption of each construction process into carbon emissions and sums them up. The second type uses emission factors to calculate the emissions for each sub-stage of construction separately. This type divides construction into several sub-stages and calculates the emissions separately based on the product of activity data and emission factors.

[0004] The aforementioned existing technologies have the following shortcomings. First, they all use the activity level of a single construction process as the accounting unit, assuming that each construction process is independent and operates continuously, without considering the strong dependencies between construction processes in prefabricated building construction. Prefabricated building construction is characterized by the process of hoisting prefabricated components into place, then assembling and fixing them, and finally sealing them. There are strict sequential dependencies between the construction processes. When a construction process is directly suspended due to severe weather, downstream construction processes that depend on it are forced to wait, and the results of the preceding completed construction processes also enter a passive waiting state. For example, prefabricated components that have been hoisted into place but not yet assembled and fixed are in a temporary support state while waiting for the assembly and fixing construction process to resume, requiring continuous energy consumption for temporary support, displacement prevention reinforcement, and protection. This part of the carbon emissions is not generated by the construction process that is currently operating, but by the results of the completed upstream construction processes during the passive waiting period. Its accounting duration is not determined by the upstream construction process itself, but by the time when its downstream construction processes resume after the interruption. Existing technologies that use single-process activity as the accounting unit cannot capture this passively sustained carbon emission propagating along process dependencies, leading to a systematic omission in the accounting of carbon emissions from construction interruptions in prefabricated buildings. Secondly, existing environmental correction accounting techniques generally use a linear correction method proportional to the interruption duration when quantifying the additional carbon emissions generated by interruptions, failing to consider the characteristic of the additional carbon emissions from interruptions increasing at a segmented and accelerated pace with the interruption duration. After the interruption duration exceeds a certain critical value, the risk of temporary support instability, the demand for protective strength, and the amount of remedial work increase sharply due to the prefabricated components being in a semi-fixed state for an extended period. The additional carbon emissions increase at an accelerated pace with the interruption duration, and existing linear correction methods systematically underestimate additional carbon emissions under long-term interruption conditions. Summary of the Invention

[0005] This invention proposes a method and system for calculating carbon emissions during construction interruptions in tropical prefabricated buildings. It solves the problem that existing technologies use the amount of activity in a single process as the accounting unit, which fails to consider process dependencies and thus misses the passive maintenance carbon emissions that propagate along process dependencies.

[0006] To address the aforementioned technical problems, this invention provides a method for calculating carbon emissions from construction interruptions in tropical prefabricated buildings, comprising the following steps: Step S1: Obtain the interruption trigger signal at the construction site, determine the time when the interruption trigger signal meets the preset interruption conditions as the start time of the interruption event, and determine the time when the interruption trigger signal meets the preset resumption conditions as the end time of the interruption event. Step S2: Determine the dependencies between each construction process, identify the construction process that falls into the interruption event and stops work directly due to severe weather as the active interruption process, identify the construction process that is the predecessor of the active interruption process and has completed its work as the passive maintenance process, calculate the passive maintenance carbon emissions generated by the passive maintenance process in order to maintain the process status while waiting for the active interruption process to resume work, and the calculation time of the passive maintenance carbon emissions is the time between the time when the active interruption process stops work and the time when the active interruption process resumes work; Step S3: Sum the passively maintained carbon emissions with the carbon emissions of all construction processes at the construction site except for the passively maintained processes to obtain the total carbon emissions of the construction phase.

[0007] Preferably, the passive carbon emission amount in step S2 is determined based on the carbon emission intensity per unit time of the passive maintenance process and the calculation duration. The carbon emission intensity per unit time is the carbon emission amount per unit time generated by the results of the passive maintenance process in the maintenance state through temporary support, anti-displacement reinforcement and protection.

[0008] Preferably, the passively maintained carbon emissions increase at a segmented, accelerated rate as the calculation period lengthens. When the calculation period lengthens no more than a preset critical period, the passively maintained carbon emissions increase at a first growth rate as the calculation period lengthens. When the calculation period lengthens more than the preset critical period lengthens, the passively maintained carbon emissions increase at a second growth rate as the calculation period lengthens, and the second growth rate is greater than the first growth rate.

[0009] Preferably, the expression for the passively maintained carbon emissions is: ; In the formula, For passive maintenance process Passive maintenance of carbon emissions; For passive maintenance process The carbon emission intensity maintained per unit time; To calculate the time required, the process is actively interrupted. The time of work stoppage until the process is actively interrupted The duration between the times when the task is resumed; Preset critical duration; The deterioration acceleration factor is greater than 1.

[0010] Preferably, determining the time when the active interruption process stops in step S2 includes the following steps: obtaining the real-time energy consumption of the equipment at the construction site, and determining the starting time when the real-time energy consumption of the equipment drops below a preset shutdown energy consumption threshold and continues for a preset determination time after the interruption trigger signal meets the preset interruption condition as the time when the active interruption process stops.

[0011] Preferably, in step S2, the time for resuming the work of the construction process that falls into the interruption event is determined according to the recovery order of the construction process, and the time when the actively interrupted process resumes normal operation is determined as the time when the actively interrupted process resumes operation.

[0012] Preferably, step S3 includes the following steps: determining the carbon emissions of the construction process that does not fall into the interruption event as the continuous operation carbon emissions, determining the passively maintained carbon emissions and the carbon emissions generated by the construction process that falls into the interruption event as the interruption event carbon emissions, and summing the continuous operation carbon emissions and the interruption event carbon emissions to obtain the total carbon emissions of the construction stage.

[0013] Preferably, the process response type of the construction process is determined based on the energy consumption characteristics of the construction process during the interruption event. The process response type includes instantaneous stop, continuous, and recovery. The instantaneous stop is the process type in which energy consumption drops to zero during the interruption event. The continuous process is the process type in which energy consumption is continuously higher than a preset energy consumption threshold during the interruption event. The recovery process is the process type in which energy consumption was zero before the interruption event and is higher than zero during the interruption event. The carbon emissions of the instantaneous stop process during the interruption event are set to zero. The carbon emissions of the continuous process are split into a basic item included in the continuous operation carbon emissions and a deterioration increment item included in the interruption event carbon emissions. The carbon emissions of the recovery process are included in the interruption event carbon emissions.

[0014] Preferably, the base term is the product of the carbon emission rate per unit time of the continuous process during the adjacent normal operation period before the interruption event and the continuous operation duration of the continuous process, wherein the continuous operation duration is the time between the moment when the construction site stops normal operation during the interruption event and the moment when the continuous process resumes normal operation, and the deterioration increment term is the difference between the actual carbon emission of the continuous process during the continuous operation duration obtained by process-level energy consumption measurement and the base term.

[0015] This invention also provides a carbon emission accounting system for construction interruptions in tropical prefabricated buildings. The system is used to implement the aforementioned carbon emission accounting method for construction interruptions in tropical prefabricated buildings, comprising: Event recognition module: used to acquire interruption trigger signals at the construction site, and to determine the period from when the interruption trigger signal meets the preset interruption conditions to when it meets the preset resumption conditions as an interruption event; Dependency propagation accounting module: used to determine the dependency relationship between construction procedures, identify construction procedures that fall into the interruption event and stop work directly due to severe weather as active interruption procedures, identify the preceding and completed construction procedures of the active interruption procedures as passive maintenance procedures, and calculate the passive maintenance carbon emissions generated by the passive maintenance procedures in order to maintain the status of the procedure results while waiting for the active interruption procedures to resume. General ledger summary module: used to sum the passively maintained carbon emissions with the carbon emissions calculated according to the activity volume of each construction process at the construction site, to obtain the total carbon emissions of the construction phase.

[0016] The advantages of this invention include at least the following: 1. Determine the dependencies between various construction processes, identify construction processes that are suspended due to severe weather as actively interrupted processes, and identify the completed preceding construction processes as passively maintained processes. Calculate the passive carbon emissions generated by the passively maintained processes while waiting for the active interrupted processes to resume, and make the calculation time for these passively maintained carbon emissions determined by the resumption time of the active interrupted processes. This captures the passively maintained carbon emissions that are missed by existing technologies that use the activity of a single process as the calculation unit, which propagate along the process dependencies, making the calculation of carbon emissions from construction interruptions in prefabricated buildings more complete. 2. The passively maintained carbon emissions are characterized as increasing at a segmented and accelerated rate with the duration of the interruption. When the interruption duration exceeds the preset critical duration, the emissions increase at a greater rate. This overcomes the problem of the existing linear correction method systematically underestimating additional carbon emissions under long interruption conditions, making the calculation results more consistent with the actual engineering situation. 3. Objectively determine the process response type based on the energy consumption characteristics of the construction process during the interruption event, and separate the carbon emissions of continuous processes into basic items and deterioration increment items to ensure accurate separation of carbon emissions from continuous operations and carbon emissions from interruption events, and make the accounting results traceable. Attached Figure Description

[0017] Figure 1 This is a flowchart of a method according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the propagation of interruptions along process dependencies and the passive maintenance of carbon emissions in an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the segmented, accelerated growth of passively maintained carbon emissions as the duration of the interruption increases, according to an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0019] This invention provides a method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings, such as... Figure 1 As shown, this method includes the following steps: Step S1: Obtain the interruption trigger signal at the construction site, determine the start time of the interruption event when the interruption trigger signal meets the preset interruption conditions, and determine the end time of the interruption event when the interruption trigger signal meets the preset resumption conditions.

[0020] This embodiment acquires the interruption trigger signal at the construction site and defines the period from when the interruption trigger signal meets the preset interruption conditions to when the preset resumption conditions are met as an interruption event. The interruption trigger signal includes at least one of the following: the meteorological warning level issued by the meteorological department, the actual meteorological value output by the on-site meteorological monitoring terminal, and the on-site work stoppage instruction received by the construction management system. The preset interruption conditions are that at least one of the following is met: the meteorological warning level reaches a preset level threshold, the actual meteorological value exceeds a preset actual measurement threshold, or the on-site work stoppage instruction is received.

[0021] This embodiment obtains the real-time energy consumption of equipment at the construction site to determine the time when the construction process stops. This embodiment determines the time when the real-time energy consumption of the equipment drops below a preset shutdown energy consumption threshold after the interruption trigger signal meets the preset interruption conditions and remains below the threshold for a preset duration as the time when the construction process stops. Furthermore, for each construction process that falls under the interruption event, the time when it resumes normal operation is determined according to the recovery order of the construction processes.

[0022] Step S2: Determine the dependencies between each construction process. Identify the construction process that falls into an interruption event and stops work directly due to severe weather as the active interruption process. Identify the construction process that is the predecessor of the active interruption process and has completed its work as the passive maintenance process. Calculate the passive maintenance carbon emissions generated by the passive maintenance process in order to maintain the status of the process while waiting for the active interruption process to resume. The calculation time for passive maintenance carbon emissions is the time between the time when the active interruption process stops work and the time when the active interruption process resumes work.

[0023] The core of this embodiment lies in calculating passively maintained carbon emissions along the process dependency relationship. For example... Figure 2 As shown, there are strict sequential dependencies between various construction procedures in prefabricated building construction. For example, prefabricated components must first undergo hoisting and positioning, then splicing and fixing, and finally sealing. This embodiment predetermines the dependencies between construction procedures and identifies the propagation of interruptions within these dependencies.

[0024] In this embodiment, a construction process that falls under an interruption event and is directly halted due to severe weather is defined as an actively interrupted process. Downstream construction processes that rely on actively interrupted processes, although not directly affected by severe weather, cannot proceed due to the cessation of work by the actively interrupted process; in this embodiment, these are defined as passively interrupted processes. Construction processes preceding and already completed by the actively interrupted process, whose results enter a passive waiting state due to the cessation of work by the actively interrupted process, are defined in this embodiment as passively maintained processes.

[0025] Taking the hoisting and positioning, splicing and fixing, and sealing processes of precast components as examples, when the splicing and fixing process is halted due to a typhoon, it is an actively interrupted process. The sealing process, which depends on the splicing and fixing process, is a passively interrupted process, while the completed hoisting and positioning process is a passively maintained process. Precast components that have been hoisted but not yet spliced ​​and fixed remain in a temporary support state while awaiting the resumption of the splicing and fixing process. This requires continuous energy consumption for temporary support, displacement prevention reinforcement, and protection, thus generating passively maintained carbon emissions.

[0026] This embodiment establishes a pairing relationship between passive maintenance procedures and active interruption procedures based on a pre-determined construction procedure dependency. For any active interruption procedure, the construction procedure that is the direct follow-up procedure of the active interruption procedure and has been completed is determined as the passive maintenance procedure corresponding to the active interruption procedure. Thus, each passive maintenance procedure uniquely corresponds to one active interruption procedure, and the calculation duration of the passive maintenance procedure is taken as the interruption duration of the corresponding active interruption procedure.

[0027] In this embodiment, the carbon emission intensity per unit time for passive maintenance processes is calculated based on the energy consumption of each maintenance operation under its maintenance state. The expression for the carbon emission intensity per unit time is: ; In the formula, For passive maintenance process The carbon emission intensity maintained per unit time, expressed in kilograms of carbon dioxide equivalent per hour; For passive maintenance process In the maintenance state, the first Energy consumption per unit time for maintenance operations, which include temporary support, anti-displacement reinforcement and protection, is expressed in kilowatt-hours per hour. In order to be with the first The energy carbon emission factor corresponding to each maintenance operation is expressed in kilograms of carbon dioxide equivalent per kilowatt-hour. To maintain the sequence number of the operation, the energy consumption per unit time is collected by the process-level energy consumption metering device configured at the construction site for the passive maintenance process.

[0028] This embodiment calculates the passive maintenance carbon emissions generated by the passive maintenance process in order to maintain the state of the process results while waiting for the active interruption process to resume. The calculation period for passive maintenance carbon emissions is the time between the time the active interruption process stops operating and the time the active interruption process resumes operating. Assume the active interruption process... The time to stop the operation is Actively interrupt the process The time to resume operation is Then the accounting time The expression is: ; In the formula, For the purpose of calculating duration, the unit is hours; To actively interrupt the process The time when operations cease is in hours. To actively interrupt the process The time for resuming operations is measured in hours. It is important to emphasize that the accounting duration for passively maintained carbon emissions is not determined by the operational parameters of the passively maintained process itself, but by the time of resumption of operations in its downstream actively interrupted processes. This cross-process duration dependency is the key difference between this embodiment and existing technologies that use the activity level of a single process as the accounting unit.

[0029] Considering the sharp increase in the risk of temporary support instability, the need for protective strength, and the amount of remedial work after prefabricated components have been in a semi-fixed state for an extended period, this embodiment characterizes passively maintained carbon emissions as increasing at a phased, accelerating pace over the accounting period. Please refer to... Figure 3When the calculation period is not greater than the preset critical period, the passively maintained carbon emissions increase with the calculation period at the first growth rate; when the calculation period is greater than the preset critical period, the passively maintained carbon emissions increase with the calculation period at the second growth rate, which is greater than the first growth rate.

[0030] Specifically, the expression for passively sustaining carbon emissions is: ; In the formula, For passive maintenance process The passive sustaining carbon emissions, expressed in kilograms of carbon dioxide equivalent; For passive maintenance process Maintaining carbon emission intensity per unit time, i.e., passively maintaining the process. The carbon emissions per unit time generated by temporary support, anti-displacement reinforcement and protection under the maintenance state, in kilograms of carbon dioxide equivalent per hour; To calculate the time required, the process is actively interrupted. The time of work stoppage until the process is actively interrupted The duration between the resumption of operations, in hours; The preset critical duration is in hours; The deterioration acceleration factor is greater than 1.

[0031] As can be seen from the expression, when the calculation period is no greater than the preset critical period, the passively maintained carbon emissions are proportional to the calculation period; when the calculation period is greater than the preset critical period, the portion exceeding the preset critical period is amplified by the deterioration acceleration coefficient, thus depicting the accelerated growth of passively maintained carbon emissions under long-term interruption conditions.

[0032] When multiple passive sustaining processes exist within an interruption event, this embodiment sums the passive sustaining carbon emissions of each passive sustaining process to obtain the total passive sustaining carbon emissions of the interruption event, expressed as follows: ; In the formula, The total passively sustained carbon emissions from the interruption event are expressed in kilograms of carbon dioxide equivalent. For passive maintenance process The passive sustaining carbon emissions, expressed in kilograms of carbon dioxide equivalent; This is the sequence number of the passively sustained process. The total passively sustained carbon emissions are included in the total carbon emissions of the construction phase.

[0033] Step S3: Sum the carbon emissions from passively maintained processes with the carbon emissions from all construction processes at the construction site, excluding passively maintained processes, to obtain the total carbon emissions for the construction phase.

[0034] This embodiment sums the passively maintained carbon emissions with the carbon emissions calculated based on the activity levels of each construction process at the construction site to obtain the total carbon emissions for the construction phase. The carbon emissions calculated based on the activity levels of each construction process are obtained by converting the energy and material consumption of each process according to the carbon emission factors of current national and industry standards. The expression for the carbon emissions of any construction process is as follows: ; In the formula, Construction procedures Carbon emissions, expressed in kilograms of carbon dioxide equivalent; Construction procedures The The activity data includes energy consumption and material consumption, with units of kilowatt-hours and kilograms, respectively, depending on their type. In order to be with the first The carbon emission factor corresponding to the data of each activity is expressed in kilograms of carbon dioxide equivalent per kilowatt-hour or kilograms of carbon dioxide equivalent per kilogram. The sequence number of the activity data; This refers to the sequence number of the construction procedure.

[0035] The expression for the total carbon emissions during the construction phase is: ; In the formula, The total carbon emissions during the construction phase are expressed in kilograms of carbon dioxide equivalent. Construction procedures Carbon emissions calculated based on activity levels are expressed in kilograms of carbon dioxide equivalent. The total passively sustained carbon emissions from the interruption event are expressed in kilograms of carbon dioxide equivalent. This refers to the sequence number of the construction process. Since the passively maintained carbon emissions are not generated by the ongoing construction process, they are not attributed to any construction process in the calculation based on the activity of a single process. Therefore, in this embodiment, they are calculated separately and included in the total carbon emissions of the construction phase, thereby making up for the missing carbon emissions.

[0036] In some embodiments, to facilitate the distinction between carbon emissions generated by normal construction and construction interruptions, this embodiment further divides the total carbon emissions of the construction phase into continuous operation carbon emissions and interruption event carbon emissions. This embodiment defines the carbon emissions of construction procedures that do not fall under an interruption event as continuous operation carbon emissions, and defines the carbon emissions from passively maintained operations and construction procedures that fall under an interruption event as interruption event carbon emissions. The total carbon emissions of the construction phase are obtained by summing the continuous operation carbon emissions and the interruption event carbon emissions. Based on this, this embodiment determines the process response type of the construction process according to its energy consumption characteristics during the interruption event. Process response types include instantaneous stop, continuous, and recovery. Instantaneous stop is a process type where energy consumption drops to zero during the interruption event; hoisting and transportation are examples of instantaneous stop processes. Continuous is a process type where energy consumption remains above a preset energy consumption threshold during the interruption event; concrete curing and component moisture protection are examples of continuous processes. Recovery is a process type where energy consumption is zero before the interruption event begins and remains above zero during the interruption event; dredging and maintenance are examples of recovery processes. Since the process response type is objectively determined based on process-level energy consumption metering data, the arbitrariness of manual labeling is avoided.

[0037] This embodiment sets the carbon emissions of momentary shutdown processes to zero during interruption events; it breaks down the carbon emissions of continuous processes into a base item included in continuous operation carbon emissions and a worsening increment item included in interruption event carbon emissions; and it includes the carbon emissions of recovery processes in the interruption event carbon emissions. The base item is the product of the unit-time carbon emission rate of the continuous process during the adjacent normal operation period before the interruption event and the continuous operation duration of the continuous process. The continuous operation duration is the time between the moment the construction site stops normal operation during the interruption event and the moment the continuous process resumes normal operation. The worsening increment item is the difference between the actual carbon emissions of the continuous process during the continuous operation duration, obtained from process-level energy consumption metering, and the base item. Since the actual carbon emissions equal the sum of the base item and the worsening increment item, the carbon emissions of the continuous process during the continuous operation duration are uniquely divided into the portion included in continuous operation and the portion included in the interruption event, without duplication or omission.

[0038] Specifically, the expressions for the basic term and the deterioration increment term of the continuous process are as follows: ; ; ; In the formula, For continuous processes The carbon emission rate per unit time, expressed in kilograms of carbon dioxide equivalent per hour; For continuous processes Carbon emissions during the adjacent normal operating period before the start of the interruption event, expressed in kilograms of carbon dioxide equivalent. The duration of adjacent normal operating periods, in hours; For continuous processes The basic item, with units of kilograms of carbon dioxide equivalent; For continuous processes The duration of continuous operation, in hours; For continuous processes The deterioration increment is expressed in kilograms of carbon dioxide equivalent. For continuous processes obtained from process-level energy consumption metering Actual carbon emissions during continuous operation, expressed in kilograms of carbon dioxide equivalent.

[0039] In the embodiment that distinguishes between continuous operation carbon emissions and interruption event carbon emissions, continuous operation carbon emissions are the sum of carbon emissions from construction procedures that do not fall into interruption events and the basic items of continuous procedures. Interruption event carbon emissions are the sum of total passive maintenance carbon emissions, the deterioration increment of continuous procedures, and the carbon emissions of recovery procedures. The sum of the two is equal to the total carbon emissions of the construction phase.

[0040] After obtaining the total carbon emissions during the construction phase, this embodiment identifies high-carbon interruption processes based on the carbon emissions of interruption events, and generates scheduling suggestions for the subsequent construction processes corresponding to the high-carbon interruption processes, scheduling the subsequent construction processes to the time period when the interruption trigger signal does not meet the preset interruption conditions, so that the calculation results can feed back into the optimization of construction sequence.

[0041] This invention also provides a carbon emission accounting system for construction interruptions in tropical prefabricated buildings. The system implements the aforementioned carbon emission accounting method for construction interruptions in tropical prefabricated buildings. The system includes an event identification module, a dependency propagation accounting module, and a ledger summary module. The event identification module acquires interruption trigger signals at the construction site and identifies interruption events. The dependency propagation accounting module determines the dependencies between construction procedures, identifies actively interrupted procedures and passively maintained procedures, and calculates the carbon emissions from passively maintained procedures. The ledger summary module includes the carbon emissions from passively maintained procedures in the carbon emissions from interruption events and sums the carbon emissions from continuous operations with the carbon emissions from interruption events to obtain the total carbon emissions for the construction phase.

[0042] Taking a prefabricated concrete residential project in a tropical monsoon climate zone as an application scenario, this project uses prefabricated composite floor slabs, prefabricated wall panels, and prefabricated stairs for assembly construction, with the construction period spanning the typhoon season. During the construction period, when the typhoon warning reaches a preset threshold, the ongoing splicing and fixing construction process is halted, becoming an actively interrupted process, while the prefabricated wall panels that have already been hoisted into place become a passively maintained process. This embodiment calculates the passively maintained carbon emissions generated by the temporary support and protection of the prefabricated wall panels while waiting for the splicing and fixing construction process to resume, along the process dependency relationship. The calculation duration is the time between the time the splicing and fixing construction process stops and the time it resumes, and the passively maintained carbon emissions are calculated based on a piecewise acceleration expression. Compared with the existing technology that uses the activity of a single process as the calculation unit and adopts linear correction, this embodiment completes the passively maintained carbon emissions propagating along the process dependency relationship and characterizes its accelerated growth under long interruption periods, making the calculation results of carbon emissions from construction interruptions in tropical prefabricated buildings more complete and more in line with the actual project.

[0043] The specific calculation process in this embodiment under the application scenario is as follows. First, the event recognition module connects to the meteorological warning. When the typhoon warning reaches a preset level threshold, it determines that the preset interruption conditions are met. Based on the real-time energy consumption of the on-site equipment dropping below the preset shutdown energy consumption threshold and continuing for a preset judgment duration, it determines the time when the splicing and fixing construction process stops. When the typhoon warning is lifted and the preset resumption conditions are met, it determines the time when the splicing and fixing construction process resumes operation based on the recovery order of each construction process, thus obtaining the interruption duration of the actively interrupted process. Second, the dependency propagation calculation module, based on the pre-determined construction process dependency relationship, identifies the splicing and fixing construction process as the actively interrupted process, and identifies the preceding and completed hoisting and positioning construction process as the passively maintained process. It calculates the unit-time maintained carbon emission intensity of the temporary support and protection of the positioned precast wall panels according to the expression for the unit-time maintained carbon emission intensity. Then, based on the piecewise acceleration expression and the interruption duration of the actively interrupted process, it calculates the passively maintained carbon emission amount, and sums the passively maintained carbon emission amounts of each passively maintained process to obtain the total passively maintained carbon emission amount. The third step involves summing the total passively maintained carbon emissions with the carbon emissions calculated for each construction process based on activity levels, yielding the total carbon emissions for the construction phase. In cases where it's necessary to distinguish between carbon emissions from normal construction and those from construction interruptions, the total carbon emissions for the construction phase are further categorized into continuous operation carbon emissions and interruption event carbon emissions based on the process response type. The fourth step identifies high-carbon interruption processes based on their interruption event carbon emissions and generates scheduling suggestions for subsequent similar construction processes, recommending that they be rescheduled to periods where the interruption trigger signal does not meet preset interruption conditions, thereby reducing subsequent interruption event carbon emissions.

[0044] In one simulation embodiment, to further verify the completeness and traceability of the carbon emission accounting for construction interruptions in tropical prefabricated buildings using the method of the present invention, a simulation embodiment dataset was constructed using a typhoon-interrupted construction scenario of a prefabricated concrete residential project in a tropical monsoon climate zone as the object. This dataset includes meteorological warnings, on-site meteorological measurements, real-time equipment energy consumption, construction process dependencies, energy consumption for passive maintenance operations, energy consumption for continuous processes, and energy consumption for recovery processes. This simulation embodiment is only used to illustrate the operability of the formulas and calculation processes of the present invention and does not constitute a limitation on the scope of protection of the present invention.

[0045] In this simulation embodiment, the construction process dependencies include component transportation, hoisting and positioning, splicing and fixing, sealing treatment, exterior wall waterproofing and edge sealing, and roof panel hoisting and positioning - roof node sealing. The carbon emission factors are: 0.57 kgCO2e / kWh for electricity, 2.68 kgCO2e / L for diesel, 1.85 kgCO2e / kg for steel, 2.30 kgCO2e / kg for sealing materials, and 1.20 kgCO2e / kg for protective materials. The critical durations for passive maintenance processes are: 12.0 h for hoisting and positioning, 16.0 h for splicing and fixing, 10.0 h for sealing treatment, and 8.0 h for roof panel hoisting and positioning.

[0046] Taking interruption event E000005 as an example, the meteorological warning level in this event is level 4, the on-site wind speed is 31.5082 m / s, the rainfall intensity is 28.9913 mm / h, the relative humidity is 92.5416%, and the comprehensive meteorological risk index is 0.6316. In this event, based on the interruption trigger signal and the real-time energy consumption changes of the on-site equipment, the stop operation status and resumption operation status of the active interruption process are determined, and the absolute calculation time of the active interruption process is obtained as follows: ; In this incident, the splicing and fixing process was halted due to severe weather and was therefore identified as a proactively interrupted process. The directly preceding and completed hoisting and placement process, however, was in an unstable delivery state because the precast wall panels had been hoisted but not yet fully spliced ​​and fixed, requiring temporary support, anti-displacement reinforcement, and protection; thus, it was identified as a passively maintained process. Under this incident, the passively maintained processes correspond to three passively maintained objects, and their total carbon emission intensity maintained per unit time is: ; Based on meteorological risk, the unstable delivery status of components, and the permissible duration of temporary supports, the preset critical duration for this event is determined as follows: ; The deterioration acceleration factor is: .

[0047] The preset critical duration is obtained by subtracting the basic critical duration of the passive maintenance process from the comprehensive meteorological risk index; the higher the comprehensive meteorological risk index, the shorter the preset critical duration. The deterioration acceleration coefficient is determined according to the preset correspondence between the comprehensive meteorological risk index and the unstable delivery state of the component; the higher the comprehensive meteorological risk index, the higher the deterioration acceleration coefficient. In this embodiment, the basic critical duration of the passive maintenance process is 12 hours, which is obtained by subtracting it from the comprehensive meteorological risk index of 0.6316. The corresponding deterioration acceleration coefficient .

[0048] because: ; Therefore, a segmented accelerated accounting formula under supercritical duration conditions is used to calculate passively sustained carbon emissions: ; Substituting the data, we get: ; If the traditional linear accounting method is used, the passively maintained carbon emissions are: ; Therefore, the passively sustained carbon emissions additionally identified by the method of this invention compared to the traditional linear accounting method are: ; In this scenario of prolonged typhoon interruption, the traditional linear accounting method underestimates the passively sustained carbon emissions by 29.7333 kg CO2e, with an underestimation rate of: ; This indicates that when the interruption duration exceeds the critical duration, the precast components remain in a semi-fixed state for an extended period, increasing the need for temporary support, anti-displacement reinforcement, and protection. Using segmented accelerated calculation can more accurately reflect the additional carbon emissions under long-interruption conditions.

[0049] Furthermore, in this interruption event, the continuous processes included concrete curing and component moisture protection. The carbon emissions from the concrete curing process during the adjacent normal operating period were 17.0043 kg CO2e, and the duration of the adjacent normal operating period was 11.6954 h. Therefore, the carbon emission rate per unit time was: ; The continuous operation duration within the interruption event is 37.3637 hours, therefore the basic items are: ; The actual carbon emissions obtained from process-level energy consumption metering are 84.4160 kg CO2e. Therefore, the deterioration increment of the concrete curing process is: ; The carbon emissions from the component moisture-proofing process during an adjacent normal operating period are 5.7719 kg CO2e, and the duration of the adjacent normal operating period is 8.3497 h. Therefore, the carbon emission rate per unit time is: ; The continuous operation duration within the interruption event is 35.1888 hours, therefore the basic items are: ; The actual carbon emissions obtained from process-level energy consumption metering are 37.7709 kg CO2e. Therefore, the deterioration increment of the component moisture-proofing process is: ; In the recovery process, the dredging and maintenance process is activated during the interruption event, consuming 5.8941 kWh of electricity, 1.4057 L of diesel fuel, and 1.3786 kg of protective materials. Therefore, the carbon emissions of the recovery process are calculated as follows: ; According to the mutually exclusive accounting rule, the carbon emissions of construction procedures not included in the interruption event and the basic items of continuous procedures are classified as continuous operation carbon emissions. The total passively maintained carbon emissions, the incremental items of continuous procedures, and the carbon emissions of recovery procedures are classified as interruption event carbon emissions. In this event, the continuous operation carbon emissions are: ; The carbon emissions from the interruption event are: ; ; The total carbon emissions during the construction phase are: ; ; If the traditional linear passive sustaining accounting method is used, the total carbon emissions during the construction phase of this event would be 244.9598 kg CO2e. The total carbon emissions during the construction phase obtained by the method of this invention are higher than those calculated using the traditional linear accounting method. ; The increase ratio is: ; Therefore, this embodiment shows that the present invention can identify the passive sustaining carbon emission increments that are not fully reflected by traditional single-process activity quantity accounting and linear interruption correction methods, and can mutually exclude the carbon emissions of continuous operation, carbon emissions of interruption events and passive sustaining carbon emissions, thereby avoiding double measurement and omission measurement.

[0050] Regarding the identification of high-carbon interruption processes, the passive maintenance carbon emissions corresponding to the hoisting and positioning process in this incident were 88.7437 kgCO2e, which is higher than the deterioration increment of 30.0919 kgCO2e for the concrete curing process, the deterioration increment of 13.4458 kgCO2e for the component moisture protection process, and the carbon emissions of 8.7812 kgCO2e for the dredging and maintenance recovery process. Therefore, the system identified the hoisting and positioning process as a high-carbon interruption process and output a scheduling suggestion: schedule the splicing and fixing process to a period when the weather warning level is lower than level 4 and the actual on-site wind and rain values ​​are lower than the threshold, in order to reduce the passive maintenance time of the hoisting and positioning process.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; only preferred embodiments of the present invention are illustrated. The descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. As long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0052] It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings, characterized in that, Includes the following steps: Step S1: Obtain the interruption trigger signal at the construction site, determine the time when the interruption trigger signal meets the preset interruption conditions as the start time of the interruption event, and determine the time when the interruption trigger signal meets the preset resumption conditions as the end time of the interruption event. Step S2: Determine the dependencies between each construction process, identify the construction process that falls into the interruption event and stops work due to severe weather as the active interruption process, identify the construction process that precedes the active interruption process and has completed its work as the passive maintenance process, calculate the passive maintenance carbon emissions generated by the passive maintenance process in order to maintain the process status while waiting for the active interruption process to resume work, and the calculation time of the passive maintenance carbon emissions is the time between the time when the active interruption process stops work and the time when the active interruption process resumes work; Step S3: Sum the passively maintained carbon emissions with the carbon emissions of all construction processes at the construction site except for the passively maintained processes to obtain the total carbon emissions of the construction phase.

2. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 1, characterized in that: The passive carbon emission amount in step S2 is determined based on the carbon emission intensity per unit time of the passive maintenance process and the calculation duration. The carbon emission intensity per unit time is the carbon emission amount per unit time generated by the results of the passive maintenance process in the maintenance state through temporary support, anti-displacement reinforcement and protection.

3. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 2, characterized in that: The passively maintained carbon emissions increase at a phased acceleration as the calculation period length increases. When the calculation period length is not greater than a preset critical period length, the passively maintained carbon emissions increase at a first growth rate as the calculation period length increases. When the calculation period exceeds the preset critical period, the passively maintained carbon emissions increase at a second growth rate with the calculation period, and the second growth rate is greater than the first growth rate.

4. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 3, characterized in that: The expression for the passively maintained carbon emissions is: ； In the formula, For passive maintenance process Passive maintenance of carbon emissions; For passive maintenance process The carbon emission intensity maintained per unit time; To calculate the time required, the process is actively interrupted. The time of work stoppage until the process is actively interrupted The duration between the times when the task is resumed; Preset critical duration; The deterioration acceleration factor is greater than 1.

5. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 1, characterized in that: Step S2, determining the time when the active interruption process stops, includes the following steps: obtaining the real-time energy consumption of the equipment at the construction site, and determining the starting time when the real-time energy consumption of the equipment drops below the preset shutdown energy consumption threshold after the interruption trigger signal meets the preset interruption condition and continues for a preset determination time as the time when the active interruption process stops.

6. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 1, characterized in that: In step S2, the time for resuming the construction process that falls into the interruption event is determined according to the recovery order of the construction process, and the time when the actively interrupted process resumes normal operation is determined as the time when the actively interrupted process resumes operation.

7. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 1, characterized in that: Step S3 includes the following steps: determining the carbon emissions of the construction process that does not fall under the interruption event as the continuous operation carbon emissions, determining the passively maintained carbon emissions and the carbon emissions generated by the construction process that falls under the interruption event as the interruption event carbon emissions, and summing the continuous operation carbon emissions and the interruption event carbon emissions to obtain the total carbon emissions of the construction phase.

8. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 7, characterized in that: The process response type of the construction process is determined based on the energy consumption characteristics of the construction process during the interruption event. The process response type includes instantaneous stop, continuous, and recovery. The instantaneous stop is the process type in which energy consumption drops to zero during the interruption event. The continuous process type is the process type in which energy consumption is continuously higher than a preset energy consumption threshold during the interruption event. The recovery process type is the process type in which energy consumption was zero before the interruption event and is higher than zero during the interruption event. The carbon emissions of the instantaneous stop process during the interruption event are set to zero. The carbon emissions of the continuous process are split into a basic item included in the carbon emissions of the continuous operation and a deterioration increment item included in the carbon emissions of the interruption event. The carbon emissions of the recovery process are included in the carbon emissions of the interruption event.

9. The method for calculating carbon emissions during construction interruptions in tropical prefabricated buildings according to claim 8, characterized in that: The basic term is the product of the carbon emission rate per unit time of the continuous process during the adjacent normal operation period before the interruption event and the continuous operation duration of the continuous process. The continuous operation duration is the time between the moment when the construction site stops normal operation during the interruption event and the moment when the continuous process resumes normal operation. The deterioration increment term is the difference between the actual carbon emission of the continuous process during the continuous operation duration, obtained from process-level energy consumption measurement, and the basic term.

10. A carbon emission accounting system for construction interruptions in tropical prefabricated buildings, characterized in that, The system is used to implement a method for calculating carbon emissions from construction interruptions in tropical prefabricated buildings, as described in any one of claims 1 to 9, comprising: Event recognition module: used to acquire interruption trigger signals at the construction site, and to determine the period from when the interruption trigger signal meets the preset interruption conditions to when it meets the preset resumption conditions as an interruption event; Dependency propagation accounting module: used to determine the dependency relationship between each construction process, identify the construction process that falls into the interruption event and stops work due to severe weather as the active interruption process, identify the construction process that has completed the preceding work of the active interruption process as the passive maintenance process, and calculate the passive maintenance carbon emissions generated by the passive maintenance process in order to maintain the status of the process results while waiting for the active interruption process to resume. General ledger summary module: used to sum the passively maintained carbon emissions with the carbon emissions calculated according to the activity volume of each construction process at the construction site, to obtain the total carbon emissions of the construction phase.

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