DOI: 10.3724/SP.J.1249.2018.02139

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:2 PP.139-145

Quality management of post-grouting for bored cast-in-place pile on passenger dedicated line based on PDCA cycle

In order to ensure the construction quality of post-grouting for bored pile of passenger dedicated line viaduct, to meet the requirement of foundation settlement for ballastless track laying, and to realize the precision management of multiple factors such as manual, material, equipment, external environment and on-site supervision, the management model of planning-do-check-action (PDCA) cycle is put forward to reduce rework and improve economic efficiency. By analyzing the influence factors of the post grouting quality, we formulate the corrective project management. The excellent rate of post-grouting increases from 78% to 100% through twice PDCA cycle management. The results of project quality management show that when the grouting is 70% of total amount, the gap of pressure and grouting can be reduced by adjusting the water-cement ratio according to pressure. When the pressure value is lower than the setting pressure (3.2 MPa at the pile end and 2.5 MPa on the pile side), the water-cement ratio can be reduced, on the contrary, it should be appropriately increased. The normal opening rate of grouting valve can be improved by arranging corrugated steel wire tube at the outside of grouting bottom valve and the side valve tube with flower arrangement. The pipeline rupture and joint detachment phenomenon caused by grouting pressure changes can be solved through adding pressure control switch and three links in the grouting pump circuit system. The results provide an important reference on how to realize the delicacy management by introducing the PDCA cycle in the large-scale transportation civil engineering.

Key words:bridge engineering,passenger dedicated line,post-grouting technology,planning-do-check-action cycle,quality management,comprehensive good rate

ReleaseDate:2018-03-20 15:26:57

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