Deconstruction is the selective dismantling of building structures to recover the maximum amount of primarily reusable and secondarily recyclable materials in a safe and cost-effective manner.Deconstruction is a labor...Deconstruction is the selective dismantling of building structures to recover the maximum amount of primarily reusable and secondarily recyclable materials in a safe and cost-effective manner.Deconstruction is a labor intensive process and can be difficult to achieve in a time-efficient and economical manner for light wood-framed buildings.Deconstruction techniques that balance hand and mechanical labor must be developed to maintain the integrity of materials for reuse and obtain maximum salvage value per unit of cost and time-on-site.This project entailed the removal of three identical WWII-era two-story wood-framed barracks buildings at Ft.McClellan Army Base,Anniston,AL,using hand deconstruction,combined mechanical and hand deconstruction techniques,and a traditional demolition method,i.e.,mechanical reduction and disposal,in order to determine“optimal”deconstruction techniques based on salvage value per unit of cost.The maximum practical materials salvage from the study buildings using 100%hand deconstruction techniques was 39%of the mass by weight.A combination of hand and mechanical techniques was discovered to have approximately the same economic efficiency as 100%hand deconstruction,measured as a ratio of gross cost per salvage value,with a 44.6%reduction in total labor-hours,and a reduction of only 7%of salvage materials by weight.These findings indicate the potential for greatly increasing wood-framed building deconstruction practice relative to the additional time-on-site and labor that is required,compared to demolition,while optimizing economic benefits.This paper describes the research methods and deconstruction techniques employed,and lessons learned to advance the practice of deconstruction to be more economically competitive and time-efficient.展开更多
Nearly 2.5 million ft^(2)of barracks must be removed from military facilities throughout the U.S.Environmental Protection Agency Region 4.While integration of manual deconstruction with traditional mechanical demoliti...Nearly 2.5 million ft^(2)of barracks must be removed from military facilities throughout the U.S.Environmental Protection Agency Region 4.While integration of manual deconstruction with traditional mechanical demolition methods has been shown to be comparable to traditional demolition methods in terms of cost and time requirements,the life cycle impacts of manual deconstruction on the environment and public health are unknown.To this end,life cycle assessment was applied to extend previous deconstruction studies of barracks at Ft.McClellan in Anniston,Alabama.Four scenarios were compared with varying degrees of time required for manual deconstruction of the barracks-100%Manual,44%Manual,26%Manual,and 100%Mechanical.Data were collected directly from the site and applied using SimaPro modeling software(PréAssociates,The Netherlands),considering two post-deconstruction options.Materials salvaged using either 100%or 44%Manual deconstruction and reused within a 20-mile radius of the deconstruction site yielded the most favorable environmental and health impacts.The significant impacts involved in the life cycle of diesel fuel required for transportation emphasize the need for developing reuse strategies for deconstructed materials at the regional level.展开更多
文摘Deconstruction is the selective dismantling of building structures to recover the maximum amount of primarily reusable and secondarily recyclable materials in a safe and cost-effective manner.Deconstruction is a labor intensive process and can be difficult to achieve in a time-efficient and economical manner for light wood-framed buildings.Deconstruction techniques that balance hand and mechanical labor must be developed to maintain the integrity of materials for reuse and obtain maximum salvage value per unit of cost and time-on-site.This project entailed the removal of three identical WWII-era two-story wood-framed barracks buildings at Ft.McClellan Army Base,Anniston,AL,using hand deconstruction,combined mechanical and hand deconstruction techniques,and a traditional demolition method,i.e.,mechanical reduction and disposal,in order to determine“optimal”deconstruction techniques based on salvage value per unit of cost.The maximum practical materials salvage from the study buildings using 100%hand deconstruction techniques was 39%of the mass by weight.A combination of hand and mechanical techniques was discovered to have approximately the same economic efficiency as 100%hand deconstruction,measured as a ratio of gross cost per salvage value,with a 44.6%reduction in total labor-hours,and a reduction of only 7%of salvage materials by weight.These findings indicate the potential for greatly increasing wood-framed building deconstruction practice relative to the additional time-on-site and labor that is required,compared to demolition,while optimizing economic benefits.This paper describes the research methods and deconstruction techniques employed,and lessons learned to advance the practice of deconstruction to be more economically competitive and time-efficient.
文摘Nearly 2.5 million ft^(2)of barracks must be removed from military facilities throughout the U.S.Environmental Protection Agency Region 4.While integration of manual deconstruction with traditional mechanical demolition methods has been shown to be comparable to traditional demolition methods in terms of cost and time requirements,the life cycle impacts of manual deconstruction on the environment and public health are unknown.To this end,life cycle assessment was applied to extend previous deconstruction studies of barracks at Ft.McClellan in Anniston,Alabama.Four scenarios were compared with varying degrees of time required for manual deconstruction of the barracks-100%Manual,44%Manual,26%Manual,and 100%Mechanical.Data were collected directly from the site and applied using SimaPro modeling software(PréAssociates,The Netherlands),considering two post-deconstruction options.Materials salvaged using either 100%or 44%Manual deconstruction and reused within a 20-mile radius of the deconstruction site yielded the most favorable environmental and health impacts.The significant impacts involved in the life cycle of diesel fuel required for transportation emphasize the need for developing reuse strategies for deconstructed materials at the regional level.
