建筑垃圾路基填筑技术

高速公路建设过程中,沿线拆迁产生大量的建筑垃圾,对建筑垃圾的回收利用,不仅能节省工程造价、节约自然资源,海能解决因建筑垃圾堆放产生的环境问题,保障高速公路建设的可持续发展。建筑垃圾主要由砖块、混凝土快、碎石等组成,是很好的路基填筑材料,经过简单的分选、挑拣,直接用于高速公路路基填筑。建筑垃圾颗粒大小不一,需要进行破碎,提出建筑垃圾在路基填筑层位采用羊足碾碾压破碎,结合振动碾压和铁三轮静压,实现建筑垃圾路基碾压密实。建筑垃圾有卡车运至路基填筑现场,现场松铺厚度不超过40 cm,倾倒后采用推土机由前向后倒退摊铺,尽量将大颗粒建筑垃圾铺在下部、细颗粒建筑垃圾铺在上部,先采用21 t羊足碾碾压6-10遍,保证路基表层颗粒粒径不超过10 cm;21 t振动压路机碾压3~6遍、22 t铁三轮压路机碾压3遍.提岀建筑垃圾路基质量控制指标和检测方法。

Construction Waste Subgrade Filling Technology

In the process of expressway construction,large quantity of construction waste is produced in the demolition along the line.The recycle and utilization of construction waste can not only save the engineering cost and natural resources,but also solve the environmental problems caused by the piling up of construction waste and ensure the sustainable development of expressway construction.The construction waste is mainly composed of brick,concrete block,broken stone and etc.,and is the good subgrade filling material.After the simple separation and picking,the construction waste can be directly used to fill the expressway subgrade.The construction waste particles vary in size and are required to crush.This paper proposes that the construction waste is rolled and crushed by the sheep foot roller at the subgrade filling level.Combined with the vibration rolling and iron three-wheel static pressing,the construction waste subgrade is realized to roll and compact.The construction waste is transported to the subgrade filling site by truck.The lay-down thickness of site does not exceed 40 cm.After dumped,the construction waste is paved backwards from front to back by bulldozer.As far as possible,the large grain of construction waste is laid on the bottom and the fine grain is paved on the top.Firstly,the construction waste is rolled and compacted for 6?10 times by 21-t sheet foot roller in order to ensure the surface particle size of subgrade not exceeding 10 cm.Then 21-t vibratory roller is used to roll for 3?6 times and 22-t steel three-wheel road roller is used to roll for 3 times.This paper puts forward the quality control index and detection method of construction waste subgrade.