2022 first-class construction engineer municipal forecast test point Matou door construction technology, first-built finish prediction, long press and like + forward + evaluation continue to be updated, Wendang version click on my avatar private message to me: 2022
(1) The initial support construction of the vertical shaft should be buried at the Matou door, and the advance small conduit should be penetrated along the outer contour line of the Matou door arch, and grouting and reinforcement of the formation.
(2) The excavation of the horse head door should be broken in sections, and it should be broken in the order of first arching, then side walls, and finally bottom plates.
(3) The horse head door should be opened in order, and the horse head doors in the same vertical shaft shall not be constructed at the same time. Only after one tunnel is excavated 15m, the horse-head door on the other side can be opened. When the elevation of the horse head door is inconsistent, the principle of "low first and then high" should be followed.
Tunnel Excavation Construction
① When the distance between the two excavation surfaces in the same tunnel is 2 times the distance between the hole span and is not less than 10m, one end should stop excavation and keep the excavation surface stable.
② When the distance between two parallel tunnels (including guide holes) is less than 1 times the distance between the hole span, the distance between the front and back of the excavation surface shall not be less than 15m.
