Construction method of graded broken stone and cement composite packing layer

• Main Authors: XING LIANG, WANG KAIKANG, WANG ZHIBIN, XIAO JINFENG, SUN JIALIANG, YANG YONGQIANG
• Format: Patent
• Language: English
• Published: 19.08.2015
• Subjects: CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES; EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; MACHINES FOR MAKING RAILWAYS OF ALL KINDS; PERMANENT WAY; PERMANENT-WAY TOOLS; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

The invention discloses a construction method of a graded broken stone and cement composite packing layer. The construction method includes watering to cover and maintain after filling and grinding of graded broken stone and cement filler meet the compacting standard; detecting the setting and hardening degree of the packing layer after a day, detecting dynamic deformation modulus Evd, the foundation coefficient K30 and/or secondary deformation modulus Ev2 indicators of the packing layer by a test instrument, grinding in a vibration manner by a road roller adopting filling and grinding if the indicators are up to the set values, so that the packing layer can generate map cracks so as to eliminate partial shrinkage stress generated by drying shrinkage and temperature shrinkage of the graded broken stone with the cement, and serious shrinkage cracks are avoided; stopping grinding if the indicators reach 55-65% of the preset value before vibratory grinding; watering again to cover and maintain for seven days or paving geogrid on the packing layer after the cracks are healed automatically, and paving, grinding, maintaining, cracking and constructing on the former layer. The construction method can control shrinkage cracks of the graded broken stone with the cement and is applicable to filling and construction of filler of the graded stone with the cement in different mixing amounts.