Abstract:  Construction techniques such as the intelligent molding of arch wall lining, integrated pouring of bottom lining, and synchronous onetime pouring of ditch cable trough are used to improve the structural entity quality of railway tunnels′ arch wall lining, bottom lining, and ditch cable trough lining and solve the defect problem of tunnel integral lining quality. Quality defects such as lining cavities, cracks, compactness, water leakage, water stop deviation, construction joint crushing, cracking, and chipping can be effectively avoided with the help of concrete automatic spray maintenance construction technology. Based on the research and development of complete sets of equipment, a series of construction techniques such as innovative construction joint quality control, arch pouring plumpness control, arch wall lining cavity prevention, inverted arch and side formwork integration, ditch cable trough mechanization, and spray curing are used, which improves construction technology and standards of railway tunnel lining concrete pouring, vibration, maintenance, etc., realizing controllable lining quality based on information technology and automatic monitoring technology. The results show that construction techniques and equipment innovations can achieve automatic, informatized, and intelligentized lining construction to a certain extent, greatly improve the technical level of lining construction, reduce labor intensity and lining quality defects, and improve lining construction quality  while ensuring  operator safety.

Key words: railway tunnel, lining quality improvement, arch wall lining, bottom lining, ditch and cable trough, concrete curing, equipment informatization