|Table of Contents|

Green demolishing technology of beams or columns with embedded holes by mechanical cutting and off-site blasting(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年06期
Page:
111-117
Research Field:
建筑结构
Publishing date:

Info

Title:
Green demolishing technology of beams or columns with embedded holes by mechanical cutting and off-site blasting
Author(s):
YE Jianjun1;  PENG Qingbo1;  XIAO Jianzhuang2;  LAN Wuji3;  WANG Jianyong3
(1. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, Hubei, China; 2. College of Civil Engineering, Tongji University, Shanghai 200092, China; 3. Shanghai Tianyan Building Shift Engineering Co., Ltd., Shanghai 200336, China)
Keywords:
reinforced concrete beam or column;  embedded hole;  mechanical cutting;  off-site blasting;  green demolition
PACS:
TU751.9
DOI:
10.19815/j.jace.2022.07066
Abstract:
In order to meet the needs of green demolition in complex urban environment, based on the advantages of mechanical cutting and blasting, a green demolition technology of beams or columns with embedded holes by mechanical cutting and off-site blasting was proposed. The main features of the technology are that the whole process of the demolition of reinforced concrete beam or column system was divided into two steps: on-site disintegrating and off-site crushing. During the pouring of reinforced concrete beams or columns, the cutting rope holes and blasting axial holes would be embedded. When it came to the demolition step, the beam and column were mechanically cut in sections by using the rope holes on site, and then hoisted and transported to a secluded crushing site, then the embedded holes in the beam or column sections were used for blasting and crushing. In order to highlight the advantages of the new technology, by taking a demolition project of a foundation pit support beam as an example, the new demolition technology was compared with the existing feasible demolition technologies. The results show that the recycled value of steel bars has covered the demolition cost, and the demolition cost of the new technology is 11.8% lower than that of the nearest feasible technology(rope saw cutting + remote crushing with hydraulic breaking hammer). This technology will enable realizing the green demolition of reinforced concrete beams and columns without drilling, lower cost and environmental impact, make it possible to avoid blasting safety assessment, safety supervision and safety inspection in the projects of blasting demolition of reinforced concrete beams or columns in urban environment, and provide a new idea to carry out the recycling and treatment of construction solid waste at the same time in the crushing site, which has high practical application value.

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Last Update: 2023-12-01