Over-excavation and under-excavation control construction method for mechanically and partially excavating tunnel

• Main Authors: ZHANG HONGWEI, TAN BO, ZHAO YIBO, GUO HONGYU, LEI RUNJIE, ZHANG TENG, PENG KEYUN, FU RUILIANG, FU HELIN
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; GYROSCOPIC INSTRUMENTS; LARGE UNDERGROUND CHAMBERS; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING DISTANCES, LEVELS OR BEARINGS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MINING; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SHAFTS; SURVEYING; TESTING; TUNNELS

The invention discloses an over-excavation and under-excavation control construction method for mechanically and partially excavating a tunnel, which comprises the following steps of: projecting a laser control point and a laser control line on a tunnel excavation section by arranging a laser guidance pointing instrument, and projecting a tunnel face image on the tunnel excavation section by arranging a tunnel face projection device; wherein the laser control line can be used for conveniently controlling the circumferential back break amount of the tunnel, and the longitudinal back break amount can be accurately and conveniently controlled by using the tunnel face image and the laser control point, so that the construction progress and quality of the back break of the tunnel can be improved. 本发明公开了一种机械分部开挖隧道的超欠挖控制施工方法，其通过设置激光制导指向仪在隧道开挖断面上投射出激光控制点和激光控制线，通过设置隧道掌子面投影装置在隧道开挖断面上投影掌子面图像，其中激光控制线可便于控制隧道环向超欠挖量，而利用掌子面图像与激光控制点可精确方便的控制纵向超欠挖量，从而可提高隧道超欠挖的施工进度和质量。