Method for dismantling building component hierarchical regeneration and intelligent adaptive reconstruction

Abstract

The application relates to the technical field of building component regeneration, and particularly discloses a method for graded regeneration and intelligent adaptive reconstruction of building components after demolition, which comprises accurate graded disassembly of the building components, regeneration treatment of different types of complete building components, and regeneration treatment of the third type of damaged building components. The method has the functions of graded disassembly protection, accurate regeneration treatment and intelligent adaptive reconstruction, improves the direct utilization rate of the complete building components, avoids waste of the intact building components, can be used in temporary buildings, municipal roads, gardens and the like, and has remarkable economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of building component regeneration technology, and in particular relates to a method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components. Background Technology

[0002] Currently, the construction industry is shifting from incremental expansion to stock optimization. During the demolition and renovation of existing buildings, a large number of building components such as concrete slabs, beams, columns, and masonry are generated. The recycling of these demolished components is crucial for reducing building carbon emissions and achieving resource recycling. Currently, the recycling of demolished building components mainly faces the following problems: Violent demolition results in low component utilization. Existing demolition methods mostly employ extensive approaches such as mechanical crushing and blasting, uniformly crushing components into aggregate regardless of their condition. This destroys intact components that could have been directly recycled, significantly reducing their resource value. At the same time, the crushing process generates a large amount of dust and noise pollution, placing a heavy burden on the environment.

[0003] The recycling process lacks grading and has limited utilization methods. It fails to accurately grade the demolished components based on their material, condition, and mechanical properties. As a result, most recycled products are low-value-added aggregates used for road bases or non-load-bearing components, failing to achieve high-quality utilization. In particular, there is a lack of targeted recycling solutions for different types of components, such as reinforced concrete and masonry components.

[0004] The recyclable components have poor adaptability and limited applicability. During the recycling process, the size and mechanical performance requirements of the recycled components and the application project are not considered. Traditional casting or simple splicing methods are often used, which leads to difficulties in installing the reconstructed components, poor connection reliability, and difficulty in meeting the construction requirements of prefabricated buildings.

[0005] While existing technologies have proposed some refined demolition and recycling solutions to address the above issues, they still suffer from shortcomings such as vague grading standards and lack of reconfigurable design, making it impossible to achieve precise and high-quality utilization of demolished components throughout the entire chain from demolition, grading, recycling to reconfiguration. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for graded regeneration and intelligent adaptive reconstruction of dismantled building components, which combines graded dismantling and protection, precise regeneration processing, and intelligent adaptive reconstruction.

[0007] To achieve the aforementioned objective, the technical solution of the present invention is implemented as follows: a method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components is provided, comprising the following steps: S1. Identify the components to be demolished, determine the component type and distribution location, conduct preliminary performance testing on the components, generate a component integrity test report, and mark the intact components; S2. Develop differentiated component dismantling plans based on the identified component types and their condition, and carry out the dismantling work. S3. The dismantled components are classified into three levels according to material, integrity and mechanical properties, and then recycled according to their classification. S4. Record the material, size, performance test data, classification results and proposed recycling process of each type of component using RFID tags to establish a component information database and achieve full-process traceability. S5. Use BIM software to establish a structural model of the proposed application project, extract the required parameters of the components such as size, mechanical properties, connection method, and assembly accuracy, and compare them with the data in the component information database to generate a component adaptation requirement list for the proposed application project.

[0008] Preferably, in step S1, the component types include concrete slabs, beams, columns, and masonry; the equipment for preliminary performance testing of the components includes an ultrasonic tester and a rebound hammer.

[0009] Preferably, in step S2, the differentiated component disassembly scheme includes: S21. For concrete slabs, beams, columns and other components with an integrity of more than 90%, a non-destructive dismantling method of diamond circular saw cutting + temporary support is adopted, with the cutting accuracy controlled within 2mm to avoid damage to the components. S22. For components with 60%-90% integrity, a semi-non-destructive disassembly method of partial crushing + core preservation is adopted to remove the damaged parts and retain the intact core area. S23. For components with an integrity of less than 60%, a fine crushing method shall be adopted to ensure uniform particle size for the preparation of recycled aggregate.

[0010] Preferably, in step S3, the three-level classification includes: Category 1: Reinforced concrete components with a post-demolition integrity of more than 90% and a compressive strength ≥ C30 are classified as complete and undamaged components, which can be directly processed into high-quality load-bearing recycled components after adaptation. Category 2: Reinforced concrete / masonry with 60%-90% integrity after demolition, and with the compressive strength of reinforced concrete components ≥ C25 and the compressive strength of masonry components greater than 10MPa, are classified as core intact components. After adaptation and repair, they are processed into load-bearing recycled components. Category 3: Concrete slabs, beams, columns, and masonry with less than 60% integrity after demolition and mechanical properties not reaching C25 / 10MPa are classified as damaged components, which are suitable for crushing and recycling into aggregates or base materials for the preparation of low-value recycled components.

[0011] Preferably, the sorting and regeneration process includes: The complete concrete slab in the first type of complete and undamaged components is processed into a precast base plate of recycled composite floor slab, and a 20mm shear stud and composite layer pouring interface are reserved. The complete concrete beam is processed into a load-bearing beam of recycled road slab, and a 100mm diameter steel sleeve connection structure is reserved at its end, and a splicing slot is reserved on the side of the beam. The complete column, beam and slab components are combined and processed into temporary building box house structure or ecological fish reef. The concrete slabs in the second type of intact core components are processed into precast base slabs of recycled composite floor slabs, and the intact core concrete beams are prepared as secondary beams of temporary building box sheds or edge beams of recycled road slabs. The third type involves preparing aggregates or substrates from broken components into composite mortars for recycled composite floor slabs, recycled masonry mortars, recycled micro powders, or concrete admixtures.

[0012] Preferably, in step S1, the identification method of the component to be demolished is to use BIM, three-dimensional laser scanning and other technologies to perform overall structural modeling of the building to be demolished, and identify the component type (concrete slab, beam, column, masonry, etc.) and distribution location.

[0013] Preferably, the fine crushing of the damaged components includes graded crushing; the graded crushing uses a jaw crusher + impact crusher to crush the damaged components, and after crushing, the components are screened by a three-layer screening machine to obtain three kinds of recycled aggregates with different particle sizes.

[0014] Preferably, the recycled coarse aggregate with a particle size of 5-31mm in the recycled aggregate needs to be repaired before use: the recycled coarse aggregate is soaked in a composite modified liquid for 4 hours, and then sent into a sealed carbon fixation tank, where CO2 gas is introduced under a pressure of 0.5MPa and a temperature of 80℃ for carbon fixation treatment for 6 hours. Preferably, the composite modified liquid is prepared by mixing calcium oxychloride, nano silica sol and metakaolin in a mass ratio of 1:0.8:0.05, and the solid ratio of the composite modified liquid to the recycled aggregate liquid is 1:3.

[0015] Preferably, the recycled fine aggregate with a particle size of 0.15-4.75mm in the recycled aggregate needs to be modified before use: take 100 parts of recycled fine aggregate and 5 parts of fly ash, mix them evenly and then spray water for curing, and use them to prepare composite mortar for recycled composite floor slabs and recycled masonry mortar; the recycled micro powder with a particle size of less than 0.15mm in the recycled aggregate needs to be collected by airflow separation before use as concrete admixture.

[0016] The beneficial effects of this invention are reflected in: (1) The method provided by the present invention improves the value of resource utilization: it recycles dismantled building components in a high-quality manner, increases the direct utilization rate of complete components, avoids waste of intact components, and can be used in temporary buildings, municipal roads, gardens and other scenarios, with significant economic benefits.

[0017] (2) The method provided by the present invention improves the recyclability of components; by constructing a database of dismantled components and a list of target project requirements in the present invention, the dismantled components are accurately matched with the required components, thereby improving the utilization rate of dismantled components.

[0018] (3) The method provided by the present invention can promote resource conservation and sustainable development, improve the recycling rate of dismantled components, reduce the pollution of the environment caused by traditional landfill and other methods, and meet the national "dual carbon" goal. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process for the graded recycling method of demolished buildings according to the present invention. Detailed Implementation

[0020] The technical solutions in 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 a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example like Figure 1 As shown: This invention provides a method for graded regeneration and intelligent adaptive reconstruction of demolished building components, which is mainly divided into precise graded dismantling of demolished components, regeneration processing of different types of complete components, and regeneration processing of third-type damaged components.

[0022] 1) Precise graded dismantling of components includes the identification and detection of components, graded dismantling construction, and grading and labeling of components. The specific steps are as follows: 11) Identification and inspection of demolished components; model the overall structure of the demolished building, identify component types (concrete slabs, beams, columns, masonry, etc.) and their distribution locations; conduct preliminary performance tests on key components using ultrasonic testing equipment and rebound hammers, generate inspection reports, and mark areas with potentially intact components.

[0023] BIM, 3D laser scanning and other technologies are used to create an overall structural model of the demolished building, identify the types of components (concrete slabs, beams, columns, masonry, etc.) and their distribution locations, and form a component information database.

[0024] 12) Graded dismantling of components; differentiated dismantling plans are formulated according to the type and integrity of the components: for concrete slabs, beams, columns and other components with an integrity of more than 90%, a non-destructive dismantling method of diamond circular saw cutting + temporary support is adopted, with the cutting accuracy controlled within 2mm to avoid damage to the components. For components with 60%-90% integrity, a semi-non-destructive disassembly method of partial crushing + core preservation is adopted to remove the damaged parts and retain the intact core area. For components with less than 60% integrity, a fine crushing method is used to ensure uniform particle size for the preparation of recycled aggregate.

[0025] 13) Classification and labeling of dismantled components; The dismantled components will be classified into three levels according to "material - integrity - mechanical properties," further clarifying the classification standards and applicable recycling directions. The specific classifications are as follows: Category 1: Complete and undamaged components (material: reinforced concrete, 90% integrity, compressive strength of reinforced concrete components ≥ C30), suitable for direct processing into high-quality load-bearing recycled components; Category 2: Core intact components (material: reinforced concrete / masonry. Integrity 60%-90%, compressive strength of reinforced concrete components ≥ C25, compressive strength of masonry components 10MPa), suitable for processing into load-bearing recycled components after repair; Category 3: Damaged components (of various materials, with an integrity of less than 60% and mechanical properties that do not meet the minimum standard of C25 / 10MPa), suitable for crushing and recycling as aggregate or base material, used to prepare low-value recycled components; The dismantled components are recorded using RFID tags, which record information such as the material, size, performance test data, grading results, and proposed recycling direction for each type of component. This establishes a component information database and enables full-process traceability.

[0026] 2) The recycling process for different types of complete components includes the following steps: 21) Recycling of the first type of complete and undamaged components; prefabricated base plates of complete concrete slabs are processed into recycled composite floor slabs, with 20mm shear studs and composite layer pouring interfaces reserved; load-bearing beams of complete concrete beams are processed into recycled road slabs, with 100mm diameter steel sleeve connection structures reserved at the ends and splicing slots reserved on the sides of the beams; complete column, beam and slab components can be combined and processed into temporary building box structures or ecological fish reefs.

[0027] Concrete beams can also be processed into cement piers for enclosure foundations.

[0028] Before processing, the components must be rinsed with a high-pressure water gun, and exposed steel bars must be sandblasted to remove rust.

[0029] The machining dimensions of the components required for the regenerated structure are designed according to actual needs.

[0030] 22) The second type of core intact component recycling treatment; after repair, the core intact concrete slab is processed into recycled composite floor slab precast base slab; the core intact concrete beam is prepared as the secondary beam of the temporary building box house or the edge beam of the recycled road slab; the repaired concrete components can also be processed into benches, flower beds and small sculptures in municipal gardens; the concrete components are used to form a natural stone masonry effect through chemical assembly, which is suitable for riverbank protection, steps or landscape partitions.

[0031] Before processing the components, the damaged parts are removed with a diamond circular saw, and the cut surfaces are smoothed with a grinding wheel. If there are minor cracks, carbonization can be used for repair.

[0032] 3) The recycling process for the third type of damaged components includes the following steps: 31) Graded crushing of damaged components; a jaw crusher and an impact crusher are used for graded crushing, and the crushed components are then screened by a three-layer screening machine to obtain recycled aggregates of three particle sizes. 32) Repair treatment; Recycled coarse aggregate with a particle size of 5-31mm is treated with an integrated "composite modification liquid soaking-CO2 carbon fixation" process. The composite modification liquid is prepared by mixing calcium oxychloride, nano silica sol and metakaolin in a mass ratio of 1:0.8:0.05, with a liquid-to-solid ratio of 1:3 and a soaking time of 4h. Then it is sent to a sealed carbon fixation tank and treated with CO2 gas for 6h under a pressure of 0.5MPa and a temperature of 80℃. After treatment, the water absorption rate of the recycled coarse aggregate is less than 5% and the crushing index is 18%. It is used to prepare the load-bearing layer of recycled road slabs and the outer wall panel of chemical box houses. 33) Recycling treatment; Recycled fine aggregate with a particle size of 0.15-4.75mm: Modified with fly ash (recycled fine aggregate: fly ash = 100:5), mixed evenly, and cured with water, used to prepare composite mortar for recycled composite floor slabs and recycled masonry mortar. Recycled micro powder with a particle size of less than 0.15mm: Collected by airflow separation and used as concrete admixture.

[0033] Damaged components also include brick blocks, which can be crushed using a hammer crusher, sieved through a 20mm sieve to select brick particles with 70% integrity (particle size 10-20mm), mixed with recycled brick particles in a ratio of 4:1:2:0.8 (cement:sand:water), poured into a mold (200x100x50mm) for vibration molding, and cured for 28 days to prepare recycled permeable bricks for sidewalk paving.

[0034] BIM software is used to create a structural model of the proposed project, extract the required parameters for components such as size, mechanical properties, connection method, and assembly accuracy, and generate a list of component adaptation requirements.

[0035] Based on the database of demolished components and the target project requirements list, an intelligent matching model is constructed. The material, size, mechanical properties and other parameters of the recycled components are input along with the target requirements parameters. A computer control program performs multi-objective optimization matching based on the data and requirements, and outputs the optimal matching solution to ensure that the compatibility between the recycled components and the target project is greater than 95%.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for graded regeneration and intelligent adaptive reconstruction of dismantled building components, characterized in that, Includes the following steps: S1. Identify the components to be demolished, determine the component type and distribution location, conduct preliminary performance testing on the components, generate a component integrity test report, and mark the intact components; S2. Develop differentiated component dismantling plans based on the identified component types and their condition, and carry out the dismantling work. S3. The dismantled components are classified into three levels according to material, integrity and mechanical properties, and then recycled according to their classification. S4. Record the material, size, performance test data, classification results and proposed recycling information of each type of component using RFID tags to establish a component information database; S5. Use BIM software to establish a structural model of the proposed application project, extract the required parameters for the size, mechanical properties, connection method, and assembly accuracy of the components, compare them with the data in the component information database, and generate a list of component adaptation requirements for the proposed application project.

2. The method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 1, characterized in that, In step S1, the component types include concrete slabs, beams, columns, and masonry; the equipment for preliminary performance testing of the components includes an ultrasonic tester and a rebound hammer.

3. The method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 2, characterized in that, In step S2, the differentiated component disassembly scheme includes: S21. For concrete slabs, beams, columns and other components with an integrity of more than 90%, a non-destructive dismantling method of diamond circular saw cutting + temporary support is adopted, and the cutting accuracy is controlled within 2mm. S22. For components with 60%-90% integrity, a semi-non-destructive disassembly method of partial crushing + core preservation is adopted to remove the damaged parts and retain the intact core area. S23. For components with an integrity of less than 60%, refined crushing is used to prepare recycled aggregate.

4. The method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 3, characterized in that, In step S3, the three-level classification includes: Category 1: Reinforced concrete components with a post-demolition integrity of more than 90% and a compressive strength ≥ C30 are classified as complete and undamaged components, which can be directly processed into high-quality load-bearing recycled components after adaptation. Category 2: Reinforced concrete / masonry with 60%-90% integrity after demolition, and with the compressive strength of reinforced concrete components ≥ C25 and the compressive strength of masonry components greater than 10MPa, are classified as core intact components. After adaptation and repair, they are processed into load-bearing recycled components. Category 3: Concrete slabs, beams, columns, and masonry with less than 60% integrity after demolition and mechanical properties not reaching C25 / 10MPa are classified as damaged components, which are suitable for crushing and recycling into aggregates or base materials for the preparation of recycled components.

5. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 4, characterized in that, The sorting and regeneration process includes: The complete concrete slab in the first type of complete and undamaged components is processed into a precast base plate of recycled composite floor slab, and a 20mm shear stud and composite layer pouring interface are reserved. The complete concrete beam is processed into a load-bearing beam of recycled road slab, and a 100mm diameter steel sleeve connection structure is reserved at its end, and a splicing slot is reserved on the side of the beam. The complete column, beam and slab components are combined and processed into temporary building box house structure or ecological fish reef. The concrete slabs in the second type of intact core components are processed into precast base slabs of recycled composite floor slabs, and the intact core concrete beams are prepared as secondary beams of temporary building box sheds or edge beams of recycled road slabs. The third type involves preparing aggregates or substrates from broken components into composite mortars for recycled composite floor slabs, recycled masonry mortars, recycled micro powders, or concrete admixtures.

6. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 2, characterized in that, In step S1, the identification method of the component to be demolished is to use BIM and three-dimensional laser scanning technology to perform overall structural modeling of the building to be demolished, and to identify the component concrete slab, beam, column, masonry and their distribution location.

7. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 3, characterized in that, The fine crushing of the damaged components includes graded crushing; the graded crushing uses a jaw crusher and an impact crusher to crush the damaged components, and after crushing, the components are screened by a three-layer screening machine to obtain three kinds of recycled aggregates with different particle sizes.

8. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 7, characterized in that, The recycled coarse aggregate with a particle size of 5-31mm in the recycled aggregate needs to be repaired before use: the recycled coarse aggregate is soaked in a composite modified liquid for 4 hours, and then sent into a sealed carbon fixation tank, where CO2 gas is introduced for carbon fixation treatment for 6 hours under a pressure of 0.5MPa and a temperature of 80℃.

9. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 6, characterized in that, The composite modified liquid is prepared by mixing calcium oxychloride, nano silica sol and metakaolin in a mass ratio of 1:0.8:0.05, and the solid ratio of the composite modified liquid to the recycled aggregate liquid is 1:

3.

10. The preparation method of the method for graded regeneration and intelligent adaptation and reconstruction of dismantled building components according to claim 6, characterized in that, The recycled fine aggregate with a particle size of 0.15-4.75mm in the recycled aggregate needs to be modified before use: take 100 parts of recycled fine aggregate and 5 parts of fly ash, mix them evenly and then spray water for curing; the recycled micro powder with a particle size of less than 0.15mm in the recycled aggregate needs to be collected by air separation before use as a concrete admixture.

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