大断面箱涵液压同步顶进控制系统

Synchronously Jacking Hydraulic System of Large Cross-section Box Tunneling

摘要:

与反拖动系统（ADS），前端推进（FJ）和无端自推进（ESA）等技术不同，在前方土体不需加固的条件下，为了实现先顶进后挖土这一特殊作业方式，提出了一种新的关于箱涵顶进速度、姿态和液压泵转速控制等问题的综合解决方案。该方案采用3层分级体系结构以提高系统的可靠性。“位移同步和负载均衡”的双目标控制策略实现了箱涵推进面控制点的推进位移相同的控制目标。液压系统采用变频技术，实现了无级调速和节能。也阐述了具有较强抗干扰能力的硬件电路的主要特点。该系统成功应用于上海市中环线北虹路隧道工程建设，顶进的箱涵断面尺寸高7.85m、宽34.20m、长126.00m。

Abstract:

Different from anti-drag system （ADS）, front jacking （FJ） and endless self-advancing （ESA）, a new synchronously jacking hydraulic system is presented. Under the condition of non-artificial ground freezing, it can fulfill jacking operation before excavating operation. Three-level structure of the system improves reliability. A “double-object synchronization” control scheme of displacement synchronization and even-pressure enables groups of hydraulic cylinders to control the jacking speed and posture of box. The system is saving-energy. The features of antiinterferencing hardware circuits are presented also. And the system is applied successfully in Beihong Vehicular Undercrossing Tunnel project in Shanghai, China. The tunnel is 126.00m long, 34.20m wide, and 7.85m high. And the project itself is also the one constructed with the largest cross-section under shallow saturated soft clay formation in China.