挤密桩施工装备的研制与展望

既有铁路路基挤密桩加固技术,在广深铁路路基加固工程实施后,取得良好效果。但国内外目前尚未有保证该技术全面推广的工艺装备。2002年挤密桩施工装备研制成功,填补了国内这方面的空白。该套设备包括钻孔机、夯实机和上下道装置,经在京山、京秦线试用,效果良好。本文对挤密桩施工技术基本工艺原理做了简要介绍,就已研制成功的挤密桩施工装备的主要技术参数、结构特点、解决的关键技术、现场试用效果进行了全面阐述,对其发展方向和良好的应用前景做了分析和预测。

RESEARCH AND PROSPECT ON THE CONSTRUCTION EQUIPMENT OF PACKING PILE

The technique used to reinforce foundation of railroad shows a significant effect after it was used in the construction of reinforcing the foundation of the railroad from Guangzhou to Shenzhen. But there is no any technological equipment which can guaranty it to be used widely at home or overseas. In the construction of the railroad from Guangzhou to Shenzhen, much labor force with high intensity was involved, but the production efficiency was low and the engineering quality was poor. To construct on the current foundation of railroad, limited by the narrow construction site, the construction equipment to fulfill it must be of small bulk, light weight, flexibility, high effect and so on, on the condition the safety is to be assured. In 2002, the construction equipment for packing pile was developed. It filled in the gaps in domestic in this aspect. This set of equipment includes the drilling machine, the compacting machine and an up-and -down the rail bed unit. It had a good effect after being tried out in the railroad from Beijing to Shanhaiguan and the one from Beijing to Qinhuangdao. The key part of the construction equipment for packing pile was the drilling machine. Without the high efficient top-quality drilling machine, only depending on manual construction, it is difficult to efficiently fulfill the construction of packing pile in large amount. The developed drilling machine uses a series of key techniques like hydraulic transmission, application oil cylinder-chain machine to increase the power, extending and retracting drilling rod, circular drilling teeth and fast joint etc. It can rapidly work on the rail bed and go downward to avoid the train, at the same time it satisfies what is limited by the construction environment to the equipment. This equipment can be widely used in the reinforcement of the foundation of railroad and it can bring the damaged part under control. After a slightly refit, it can also be used in geologic drilling and dealing with soft foundation. It has a good application foreground. In the paper, a brief introduction was discussed on the technological fundamentals of packing pile. The paper also discussed some developed construction equipment for packing pile, which include its main specification, structural feature, key technique, test in-situ. This paper gave an advice on the measures to improve some deficiencies in the equipment, in addition the paper foreseed and analyzed its further development and its prospect in application as well.