A method and system for evaluating carbon emissions from mechanical demolition of buildings

Abstract

The present invention provides a carbon emission evaluation method and system for mechanical demolition of buildings, which comprehensively covers all possible carbon emission sources in the demolition process, including the transportation, operation preparation, operation, noise reduction, dust removal and transportation of construction solid waste of mechanical equipment, thereby ensuring the comprehensiveness and accuracy of carbon emission evaluation and avoiding missing any important carbon emission links. In addition, by extracting samples similar to demolished buildings from the historical case sample set, an evaluation value formula that comprehensively considers multiple factors such as building area, material type, demolition method, etc. is proposed, and a weight coefficient is introduced. Combined with various indicator data of actual projects, the differences between different construction projects are simplified, and the accuracy and reliability of calculation and evaluation are improved, so that the carbon emission performance of demolition projects can be evaluated more scientifically and reasonably.

Description

Technical Field

[0001] The present invention belongs to the technical field of building energy conservation and emission reduction, and in particular relates to a carbon emission evaluation method and system for mechanical demolition of buildings. Background Art

[0002] The demolition of buildings is an inevitable part of urban renewal and reconstruction. However, the demolition process will produce a large amount of carbon emissions, which will have a certain impact on the environment. Therefore, how to scientifically and accurately evaluate and control carbon emissions during the mechanical demolition of buildings has become an important research topic in the field of building energy conservation and emission reduction technology.

[0003] Section 5.3 of the national standard GB / T51366-2019 "Building Carbon Emission Calculation Standard" lists the calculation method for mechanical demolition energy consumption. Meng Qingcheng et al.'s paper "Carbon Emissions and Carbon Compensation Analysis in the Demolition Stage of Building Waste, Environmental Engineering, DOI: 10.13205 / j.hjgc.202307007" uses a full life cycle assessment method to define the calculation boundary of the building waste demolition stage, divides it into building demolition, waste transportation and waste disposal stages, and analyzes the carbon reduction effect of the building waste demolition stage. In addition, Li Qiang et al.’s paper “Research on Carbon Emission Model and Measurement in the Building Demolition and Treatment Stage, Construction Science and Technology, DOI: 10.16116 / j.cnki.jskj.2023.24.017” took a teaching building in Huzhou as an example to conduct a carbon emissions measurement and analysis. The results showed that carbon emissions from the building demolition process accounted for 22.5% of the carbon emissions in the entire building demolition and treatment stage, carbon emissions from the waste transportation process accounted for 28.7%, and carbon emissions from the waste disposal process accounted for 48.8%.

[0004] However, the above prior art generally has the following problems:

[0005] 1) Although the national standard "Building Carbon Emission Calculation Standard" provides a method for calculating the energy consumption of mechanical demolition equipment, it fails to fully cover all carbon emission sources in the demolition process and ignores carbon emissions such as pre-transportation preparation and on-site noise reduction and dust removal during the demolition stage.

[0006] 2) The paper by Meng Qingcheng et al. mixed the demolition and disposal phases together without a systematic definition of the computational boundaries and standard reference scenarios, making it impossible to compare this technology with traditional demolition technology under the same or similar conditions.

[0007] 3) The paper by Li Qiang et al. lacks a unified evaluation basis and method among different projects. This makes it difficult to directly compare and evaluate the performance of each project in terms of demolition carbon emission control, affecting the overall carbon emission management level.

[0008] It can be seen that the current carbon emission evaluation of building demolition mainly relies on empirical estimation and simple carbon emission factor calculation, which lacks systematicity and scientificity, and usually only considers part of the demolition process, and fails to fully cover all carbon emission sources in the demolition process. In addition, existing technologies often ignore the specific characteristics and differences of demolition projects, such as building volume, structural type, material composition, etc., resulting in low accuracy and reliability of evaluation results.

[0009] Therefore, it is urgent to design a carbon emission evaluation method and system for mechanical demolition of buildings to improve the accuracy and reliability of the evaluation results during the carbon emission evaluation process of mechanical demolition of buildings. Summary of the invention

[0010] 1. Technical issues to be resolved

[0011] The present invention provides a method and system for evaluating carbon emissions from mechanical demolition of buildings, which are used to solve the problem of low accuracy and reliability of evaluation results in the process of carbon emissions from mechanical demolition of buildings. By introducing a comprehensive evaluation of multiple factors, the carbon emission performance of building demolition projects can be evaluated more scientifically and reasonably.

[0012] (II) Technical solution

[0013] The present invention discloses a method for evaluating carbon emissions from mechanical demolition of buildings, comprising the following steps:

[0014] Step 1: Obtain the building demolition project files and create a case sample set of demolition building projects;

[0015] Step 2: According to the characteristics of the demolition project, set the demolition construction scope and carbon emission sources for the carbon emission assessment of mechanical demolition of buildings;

[0016] Step 3: extract similar building samples from the case sample set of the demolished building project in step 1 according to the building volume and structure type of the demolished building project;

[0017] Step 4: Based on the demolition construction scope and carbon emission sources set in step 2, a carbon emission model for mechanical demolition of buildings is constructed, and based on various indicator data of the demolition building project, the carbon emission value E of the mechanical demolition project of buildings is calculated. demolition ;

[0018] Step 5: Based on the similar building samples extracted in step 3, a standard carbon emission model for building sample demolition is established to calculate the standard carbon emission value Baseline of similar buildings CO2 , the expression of the standard carbon emission model for the demolition of the building sample is:

[0019]

[0020] Where: Ei represents the carbon emissions of the i-th historical project, n represents the number of historical projects, α represents the importance weight of historical data, and A j represents the carbon emission coefficient of the jth material, m represents the number of material types, β represents the importance weight of the material carbon emission coefficient, M represents the scale of the demolition project, D represents the influence coefficient of the demolition method, η represents other correction coefficients, and γ represents the importance weight of the actual situation of the demolition project

[0021] Step 6: Carbon emission value E of mechanical demolition project based on step 4 demolition Similar building standard carbon emission value Baseline CO2 , considering the influence of building material composition on demolition methods, the carbon emission evaluation model formula of mechanical demolition of buildings used to calculate the evaluation value Score is as follows:

[0022]

[0023] Among them, A actual is the total building area of ​​the demolished building project, A baseline is the average building area of ​​similar building samples, W j is the weight coefficient of material j, that is, the proportion of material j in the total building materials, M j is the carbon emission coefficient of material j, and Score is the evaluation value.

[0024] Preferably, step 6 further specifically includes: according to the calculated evaluation value Score, the carbon emission performance of the demolition project is divided into different levels: excellent: Score>110, good: Score between 90 and 110, normal: Score between 70 and 90, poor: Score between 50 and 70, unqualified: Score less than 50 points.

[0025] Preferably, step 4 further specifically includes the following steps:

[0026] Step 4.1: Carbon emissions from mechanical demolition of buildings include carbon emissions from transportation of mechanical equipment E transport , Mechanical operation preparation carbon emissions E preparation , Carbon emissions from mechanical equipment operation E mecanical 、On-site noise reduction and carbon emissions E noise_control , Dust removal to control carbon emissions E dust_control Carbon emissions from construction solid waste transportation transport_waste , build a carbon emission model for mechanical demolition of buildings, and obtain the carbon emission value E of mechanical demolition of buildings demolition The calculation expression is:

[0027] E demolition =E transport+E preparation +E mecanical +E noise_control +E dust_control +E transport_waste .

[0028] Preferably, step 4 further specifically includes the following steps:

[0029] Step 4.2: During the transportation of demolition equipment to the construction site, the carbon emissions from the transportation of mechanical equipment E transport The calculation formula is as follows:

[0030] E transport =EFE transport ×M transport ×D transport

[0031] Among them, EFE transport represents the carbon emission factor of transport vehicles, M transport Indicates the weight of the transport equipment, D transport Indicates the distance the equipment is transported;

[0032] Step 4.3: Equipment operation preparation includes the equipment commissioning and testing process to obtain the mechanical operation preparation carbon emissions E preparation The calculation formula is as follows:

[0033] E preparation =EFE preparation ×M preparation ×T preparation

[0034] Among them, EFE preparation Represents the carbon emission factor in the equipment preparation stage, M preparation Indicates the power of the device, T preparation Indicates the equipment debugging and testing time.

[0035] Preferably, step 4 further specifically includes the following steps:

[0036] Step 4.4: Carbon emissions from mechanical equipment operation mecanical The calculation formula is as follows:

[0037] E mecanical =>(C i ×V i ×e i ×f e )

[0038] Among them, C i Indicates the amount of work done by the device, V i Indicates the equipment working efficiency, e i represents the energy consumption of the equipment per hour, f eIndicates the carbon emission factor per unit of energy;

[0039] Step 4.5: In order to reduce the impact of construction noise on the environment, noise reduction equipment is required during the construction process. noise_control The calculation formula is as follows:

[0040] E noise_control =EFE noise_control ×P noise_control ×T noise_control

[0041] Among them, EFE noise_control represents the carbon emission factor of the noise reduction equipment, P noise_control Indicates the power of the noise reduction device, T noise_control Indicates the usage time of the noise reduction device.

[0042] Preferably, step 4 further specifically includes the following steps:

[0043] Step 4.6: Dust removal equipment to control carbon emissions E dust_control The calculation formula is as follows:

[0044] E dust_control =EFE dust_control ×P dust_control ×T dyst_control

[0045] Among them, EFE dust_control Represents the carbon emission factor of dust removal equipment, P dust_control Indicates the power of the dust removal equipment, T dust_control Indicates the usage time of the dust removal equipment;

[0046] Step 4.7: Carbon emissions from construction solid waste transportation E transport_waste The calculation formula is as follows: transport_waste =EFE transport_waste ×M transport_waste ×D transport_waste

[0047] Among them, EFE transport_waste represents the carbon emission factor of solid waste transport vehicles, M transport_waste Indicates the weight of solid waste, D transport_waste Indicates the transportation distance of solid waste.

[0048] Preferably, the case sample set of the building demolition project in step 1 includes more than 20 building demolition project files of similar buildings.

[0049] On the other hand, the present invention also discloses a carbon emission assessment system for mechanical demolition of buildings, comprising: at least one processor; and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute any of the above-mentioned carbon emission assessment methods for mechanical demolition of buildings.

[0050] (III) Beneficial effects

[0051] Compared with the prior art, the carbon emission evaluation method and system for mechanical demolition of buildings provided by the present invention have the following beneficial effects:

[0052] (1) The present invention comprehensively covers all possible carbon emission sources in the demolition process by constructing a systematic carbon emission evaluation model, including the transportation, operation preparation, operation, noise reduction, dust removal and transportation of construction solid waste of mechanical equipment, so as to ensure the comprehensiveness and accuracy of carbon emission evaluation and avoid missing any important carbon emission links. In addition, by extracting samples similar to the demolished buildings from the historical case sample set to calculate the standard carbon emission values ​​of similar buildings, and proposing an evaluation value formula that comprehensively considers multiple factors such as building area, material type, demolition method, etc., and introducing weight coefficients, combined with various indicator data of actual projects, simplifying the differences between different construction projects, improving the accuracy and reliability of calculation and evaluation, and can more scientifically and reasonably evaluate the carbon emission performance of demolition projects.

[0053] (2) Based on the final calculated score value, the present invention also proposes clear classification standards for evaluation results, such as excellent, good, normal, poor, and unqualified, to help relevant parties intuitively understand and compare the carbon emission performance of different demolition projects, so as to effectively adjust the demolition plan, help to enhance environmental awareness in the field of construction engineering, and promote the application of green demolition technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 It is the main flow chart of the carbon emission evaluation method for mechanical demolition of buildings provided by the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In order to solve the problem of low accuracy and reliability of evaluation results in the process of carbon emissions from mechanical demolition of buildings in the prior art, the present invention designs a method and system for evaluating carbon emissions from mechanical demolition of buildings.

[0058] See also Figure 1 As shown, the carbon emission evaluation method for mechanical demolition of buildings of the present invention specifically comprises the following steps:

[0059] Step 1: Obtain building demolition project files and create a case sample set of demolition building projects.

[0060] In another embodiment, the case sample set of the demolition building project in step 1 includes a plurality of building demolition project files of similar buildings, preferably more than 20 in number, so as to provide sufficient data for subsequent extraction of similar samples.

[0061] Step 2: According to the characteristics of the demolition project, set the demolition construction scope and carbon emission sources for the carbon emission assessment of mechanical demolition of buildings.

[0062] In another embodiment, the demolition construction scope in step 2 refers to the scope of the working space involved during the entire building demolition construction period, including but not limited to the activity scope such as the transportation route of the construction waste generated during the building demolition to the construction waste treatment station.

[0063] Step 3: Extract similar building samples from the case sample set of the demolished building project in step 1 according to the building volume and structure type of the demolished building project.

[0064] Step 4: Based on the demolition construction scope and carbon emission sources set in step 2, a carbon emission model for mechanical demolition of buildings is constructed, and based on various indicator data of the demolition building project, the carbon emission value E of the mechanical demolition project of buildings is calculated. demolition .

[0065] In another embodiment, step 4 further specifically includes the following steps:

[0066] Step 4.1: Carbon emissions from mechanical demolition of buildings include carbon emissions from transportation of mechanical equipment E transport , Mechanical operation preparation carbon emissions E preparation, Carbon emissions from mechanical equipment operation E mecanical 、On-site noise reduction and carbon emissions E noise_control , Dust removal to control carbon emissions E dust_control Carbon emissions from construction solid waste transportation transport_waste , build a carbon emission model for mechanical demolition of buildings, and obtain the carbon emission value E of mechanical demolition of buildings demolition The calculation expression is:

[0067] E demolition =E transport +E preparation +E mecanical +E noise_control +E dust_control +E transport_waste

[0068] Step 4.2: During the transportation of demolition equipment to the construction site, the carbon emissions from the transportation of mechanical equipment E transport The calculation formula is as follows:

[0069] E transport =EFE transport ×M transport ×D transport

[0070] Among them, EFE transport It represents the carbon emission factor of transport vehicles (unit: kgCO2 / ton·km), M transport Indicates the weight of the transport equipment (unit: tons), D transport Indicates the distance the equipment is transported (unit: kilometers).

[0071] Step 4.3: Equipment operation preparation includes the equipment commissioning and testing process, which will also produce certain emissions, and the carbon emissions of mechanical operation preparation E preparation The calculation formula is as follows:

[0072] E preparation =EFE preparation ×M preparation ×T preparation

[0073] Among them, EFE preparation Indicates the carbon emission factor of the equipment preparation stage (unit: kgCO2 / kWh), M preparation Indicates the power of the equipment (unit: kW), T preparation Indicates the equipment debugging and testing time (unit: hours).

[0074] Step 4.4: Carbon emissions from mechanical equipment operation mecanical The calculation formula is as follows:

[0075] E mecanical=Σ(C i ×V i ×e i ×f e )

[0076] Among them, C i Indicates the amount of work completed by the equipment (unit: tons), V i Indicates equipment working efficiency (unit: hour / ton), e i Indicates the energy consumption of the equipment per hour (unit: liter / hour), f e Indicates the carbon emission factor per unit of energy (unit: kgCO2 / liter).

[0077] Step 4.5: In order to reduce the impact of construction noise on the environment, noise reduction equipment is required during the construction process. noise_control The calculation formula is as follows:

[0078] E noise_control =EFE noise_control ×P noise_control ×T noise_control

[0079] Among them, EFE nois_econtrol Indicates the carbon emission factor of the noise reduction equipment (unit: kg CO2 / kWh), P noise_control Indicates the power of the noise reduction device (unit: kW), T noise_control Indicates the usage time of the noise reduction device (unit: hours).

[0080] Step 4.6: Dust removal equipment to control carbon emissions E dust_control The calculation formula is as follows:

[0081] E dust_control =EFE dust_control ×P dust_control ×T dust_conrrol

[0082] Among them, EFE dust_control Indicates the carbon emission factor of dust removal equipment (unit: kg CO2 / kWh), P dus_tcontrol Indicates the power of the dust removal equipment (unit: kW), T dust_control Indicates the usage time of the dust removal equipment (unit: hours).

[0083] Step 4.7: Carbon emissions from construction solid waste transportation E transport_waste The calculation formula is as follows:

[0084] E transport_waste =EFE transport_waste ×M transport_waste ×D transport_waste

[0085] Among them, EFE transport_waste represents the carbon emission factor of solid waste transport vehicles (unit: kg CO2 / ton·km), M transport_waste Indicates the weight of solid waste (unit: ton), D transport_waste Indicates the transportation distance of solid waste (unit: kilometers).

[0086] It is worth mentioning that the present invention provides specific calculation formulas for various types of carbon emissions, such as equipment transportation carbon emissions, equipment operation preparation carbon emissions, mechanical equipment operation carbon emissions, noise reduction equipment carbon emissions, dust removal equipment carbon emissions, and construction solid waste transportation carbon emissions. However, if there are other large carbon emission sources under special circumstances during the demolition process, other carbon emission values ​​can also be added to E demolition in the calculation expression of .

[0087] Step 5: Based on the similar building samples extracted in step 3, a standard carbon emission model for building sample demolition is established to calculate the standard carbon emission value Base1ine of similar buildings CO2 , the expression of the standard carbon emission model for the demolition of the building sample is:

[0088]

[0089] Where: E i represents the carbon emissions of the i-th historical project, n represents the number of historical projects, α represents the importance weight of historical data, and A j represents the carbon emission coefficient of the jth material, m represents the number of material types, β represents the importance weight of the material carbon emission coefficient, M represents the scale of the demolition project (such as building area or volume), D represents the influence coefficient of the demolition method, η represents other correction factors (such as equipment efficiency, environmental conditions, etc.), and γ represents the importance weight of the actual situation of the demolition project.

[0090] Step 6: Carbon emission value E of mechanical demolition project based on step 4 demolition Similar building standard carbon emission value Baseline CO2 , considering the influence of building material composition on demolition methods, the carbon emission evaluation model formula of mechanical demolition of buildings used to calculate the evaluation value Score is as follows:

[0091]

[0092] Among them, A actual is the total construction area of ​​the demolished building (square meters), A baseline is the average building area (square meters) of similar building samples, W j is the weight coefficient of material j, that is, the proportion of material j in the total building materials, M jis the carbon emission coefficient of material j (tons / square meter), and Score is the evaluation value.

[0093] In another embodiment, step 6 further specifically includes: according to the calculated evaluation value Score, the carbon emission performance of the demolition project can be divided into different levels: Excellent: score > 110, Good: score between 90 and 110, Average: score between 70 and 90, Below Average: score between 50 and 70, Poor: score less than 50 points.

[0094] It should be noted that the evaluation result classification standards (such as excellent, good, normal, poor, and unqualified) proposed in the present invention are a standardized treatment of the calculation results. Although this classification method helps to intuitively understand the evaluation results, its essence is a specification at the application level, and the segmentation of each standard can be adjusted according to actual conditions.

[0095] It can be seen that the present invention constructs a detailed demolition carbon emission evaluation model, and obtains a score value based on a comprehensive evaluation of multiple factors such as the carbon emission value of the mechanical demolition project of the building, the standard carbon emission value of similar buildings, and the influence of building materials on the demolition method. It comprehensively covers all carbon emission sources in the demolition process, and combines the characteristics and relative differences of the actual building structure to accurately evaluate and control the carbon emissions in the building demolition process, thereby effectively adjusting the next demolition construction plan.

[0096] In summary, the carbon emission assessment method for mechanical demolition of buildings of the present invention includes the following key innovative contents:

[0097] (1) The present invention provides a systematic carbon emission assessment model for mechanical demolition of buildings, which comprehensively covers all carbon emission sources in the demolition process. The model not only considers the transportation, operation preparation, operation, noise reduction and dust removal of mechanical equipment, but also includes the transportation of construction solid waste. This systematic model ensures the comprehensiveness and accuracy of carbon emission assessment.

[0098] (2) The present invention establishes a carbon emission evaluation method based on similarity analysis by extracting samples similar to the demolished buildings from the historical case sample set. This method takes into account the differences in building volume and structural type of the demolished project, and provides a relatively objective reference basis for the evaluation results of the standard carbon emission values ​​of similar buildings. The simplified standard carbon emission model for demolished building samples has a small overall calculation amount, and each variable can be adjusted according to the project data for easy calculation.

[0099] (3) The present invention proposes a scientific evaluation formula that comprehensively considers multiple factors such as building area, material type, demolition method, etc. By introducing weight coefficients and combining various indicator data of actual projects, the differences between different construction projects are simplified and the accuracy and reliability of calculation and evaluation are improved.

[0100] In several embodiments provided by the evaluation method of the present invention, the functional units in each step can be integrated into a controller processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units. The above-mentioned integrated unit implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (RandomAccess Memory, RAM), disk or optical disk and other media that can store program codes.

[0101] The present invention also discloses a carbon emission assessment system for mechanical demolition of buildings, comprising: at least one processor; and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the carbon emission assessment method for mechanical demolition of buildings as described above in the present invention.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating carbon emissions from mechanical demolition of buildings, characterized in that: The following steps are involved: Step 1: Obtain the building demolition project files and create a case sample set of demolition building projects; Step 2: According to the characteristics of the demolition project, set the demolition construction scope and carbon emission sources for the carbon emission assessment of mechanical demolition of buildings; Step 3: extract similar building samples from the case sample set of the demolished building project in step 1 according to the building volume and structure type of the demolished building project; Step 4: Based on the demolition construction scope and carbon emission sources set in step 2, a carbon emission model for mechanical demolition of buildings is constructed, and based on various indicator data of the demolition building project, the carbon emission value E of the mechanical demolition project of buildings is calculated. demolition ; Step 4 also specifically includes the following steps: Step 4.1: Carbon emissions from mechanical demolition of buildings include carbon emissions from transportation of mechanical equipment E transport , Mechanical operation preparation carbon emissions E preparation , Carbon emissions from mechanical equipment operation E mecanical 、On-site noise reduction and carbon emissions E noise_control , Dust removal to control carbon emissions E dust_control Carbon emissions from construction solid waste transportation transport_waste , build a carbon emission model for mechanical demolition of buildings, and obtain the carbon emission value E of mechanical demolition of buildings demolition The calculation expression is: AND demolition =And transport +E preparation +E mecanical +E noise_control +E dust_control +E transport_waste ; Step 5: Based on the similar building samples extracted in step 3, a standard carbon emission model for building sample demolition is established to calculate the standard carbon emission value Baseline of similar buildings CO2 , the expression of the standard carbon emission model for the demolition of the building sample is: Where: E i represents the carbon emissions of the i-th historical project, n represents the number of historical projects, α represents the importance weight of historical data, and A j represents the carbon emission coefficient of the jth material, m represents the number of material types, β represents the importance weight of the material carbon emission coefficient, M represents the scale of the demolition project, D represents the influence coefficient of the demolition method, η represents other correction coefficients, and γ represents the importance weight of the actual situation of the demolition project; Step 6: Carbon emission value E of mechanical demolition project based on step 4 demolition Similar building standard carbon emission value Baseline CO2 , considering the influence of building material composition on demolition methods, the carbon emission evaluation model formula of mechanical demolition of buildings used to calculate the evaluation value Score is as follows: Among them, A actual is the total building area of ​​the demolished building project, A baseline is the average building area of ​​similar building samples, W j is the weight coefficient of material j, that is, the proportion of material j in the total building materials, M j is the carbon emission coefficient of material j, and Score is the evaluation value.

2. The carbon emission assessment method for mechanical demolition of buildings according to claim 1 is characterized in that: Step 6 also specifically includes: according to the calculated evaluation value Score, the carbon emission performance of the demolition project is divided into different levels: excellent: Score>110, good: Score between 90 and 110, normal: Score between 70 and 90, poor: Score between 50 and 70, unqualified: Score less than 50 points.

3. The carbon emission assessment method for mechanical demolition of buildings according to claim 2 is characterized in that: Step 4 also specifically includes the following steps: Step 4.2: During the transportation of demolition equipment to the construction site, the carbon emissions from the transportation of mechanical equipment E transport The calculation formula is as follows: AND transport =EFE transport ×M transport ×D transport Among them, EFE transport represents the carbon emission factor of transport vehicles, M transport Indicates the weight of the transport equipment, D transport Indicates the distance the equipment is transported; Step 4.3: Equipment operation preparation includes the equipment commissioning and testing process to obtain the mechanical operation preparation carbon emissions E preparation The calculation formula is as follows: AND preparation =EFE preparation ×M preparation ×T preparation Among them, EFE preparation Represents the carbon emission factor in the equipment preparation stage, M preparation Indicates the power of the device, T preparation Indicates the equipment debugging and testing time.

4. The carbon emission assessment method for mechanical demolition of buildings according to claim 3 is characterized in that: Step 4 also specifically includes the following steps: Step 4.4: Carbon emissions from mechanical equipment operation mecanical The calculation formula is as follows: AND mecanical ∑(C i ×V i ×e i ×f e ) Among them, C i Indicates the amount of work done by the device, V i Indicates the equipment working efficiency, e i represents the energy consumption of the equipment per hour, f e Indicates the carbon emission factor per unit of energy; Step 4.5: In order to reduce the impact of construction noise on the environment, noise reduction equipment is required during the construction process. noise_control The calculation formula is as follows: AND noise_control =EFE noise_control ×P noise_control ×T noise_control Among them, EFE noise_control represents the carbon emission factor of the noise reduction equipment, P noise_control Indicates the power of the noise reduction device, T noise_control Indicates the usage time of the noise reduction device.

5. The carbon emission assessment method for mechanical demolition of buildings according to claim 4 is characterized in that: Step 4 also specifically includes the following steps: Step 4.6: Dust removal equipment to control carbon emissions E dust_control The calculation formula is as follows: AND dust_control =EFE dust_control ×P dust_control ×T dust_control Among them, EFE dust_control Represents the carbon emission factor of dust removal equipment, P dust_control Indicates the power of the dust removal equipment, T dust_control Indicates the usage time of the dust removal equipment; Step 4.7: Carbon emissions from construction solid waste transportation transport_waste The calculation formula is as follows: AND transport_waste =EFE transport_waste ×M transport_waste ×D transport_waste Among them, EFE transport_waste represents the carbon emission factor of solid waste transport vehicles, M transport_waste Indicates the weight of solid waste, D transport_waste Indicates the transportation distance of solid waste.

6. The carbon emission assessment method for mechanical demolition of buildings according to claim 1 is characterized in that: The case sample set of the demolition building project in step 1 includes more than 20 building demolition project files of similar buildings.

7. A carbon emission assessment system for mechanical demolition of buildings, characterized in that: include: at least one processor; And at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the carbon emission assessment method for mechanical demolition of buildings described in any one of claims 1-6.

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