为解决硬岩顶管机在超长距离隧洞施工中面临的触变泥浆异常流失、集渣、返渣以及主顶顶推力分散造成顶推力不足等难题，依托河南省汝阳县前坪供水3#隧洞施工项目，设计、研发机械化非开挖设备硬岩顶管机，对协同联动助推系统、封浆挡渣减阻系统、泥水环流系统和收渣系统等关键技术进行研究；通过分析试验数据，构建实际顶推力模型。结果显示： 1)该设备在不超过最大负荷16 000 kN条件下，能够满足单轴抗压强度Rc＞195.93 MPa的破岩能力； 2)在1 535 m隧道施工过程中，仅开启协同联动装置和2、3号中继间，即可满足隧道顶进施工所需的顶推力。
When a hard rock pipe jacking machine bored in an
extra-long tunnel, phenomena of abnormal loss of thixotropic slurry,
accumulation of debris, backflow of debris, and main thrust force dispersion-caused insufficient jacking force occurred. A case study is
conducted on the #3 tunnel of Qianping water supply project in Ruyang, China,
and a mechanized trenchless equipment, a hard rock pipe jacking machine, is
designed and developed. Key technologies of coordinated linkage booster system,
slurry-sealing device, debris collection system, and
mud-water circulation system are analyzed. By analyzing
the test data, a real jacking force model is established. The results show that:
(1) Under a maximum load of no more than 16 000 kN, the rock-breaking capacity of the equipment meets the requirement of uniaxial
compressive strength Rc> 195.93
MPa. (2) The coordinated linkage device and the #2 and #3 relay chambers of the
equipment are activated in a 1 535 m-long tunnel,
reaching required jacking force for tunnel jacking construction.
