Abstract: To better address the issues of posture control and deviation correction during construction of rectangular pipe jacking with tight gaps, this study takes the Shasan Station project of Shenzhen Metro Line 12 as a case study.A new anti-rolling device was developed, the upper and lower multi-screw conveyors for controlling soil pressure was designed, and a detachable steel ring as the tunnel portal structure was installed for left and right pipe jacking with tight gaps. Posture control technologies such as hinged hydraulic cylinder correction, cutterhead control correction, and soil grouting correction were combined to complete the jacking of extra-large section combined rectangular pipes with tight gaps. On-site measurement data show that after the pipe jacking was completed, the horizontal and vertical deviations of the pipe segments in both the left and right lines were within the design control values, meeting the specification requirements, with good control of the jacking pipe axis. The impact of secondary jacking with tight gaps on the posture of the pipe was analyzed, and it was found that the posture of the right line pipe fit well with the left line pipe. The lateral fit distance between the left and right pipes was reasonable, with no collision phenomenon observed. Although the distance between the jacking pipes was 15% larger than the set value, it still met the overall jacking construction requirements.