Construction technology of step temporary support and partial double side walls

The invention relates to a construction technology of a step temporary support and partial double side walls. The construction technology is characterized in that an upper half cross section is excavated by a step method; a center reinforced concrete column wall temporary support system is constructed; and a lower half cross section adopts the double side walls. For the center reinforced concrete column wall temporary support system, a plurality of rows of vertical steel supports are arranged vertically; the distances between the vertical steel supports are 1.0m; the vertical steel supports are internally provided with cross connections, longitudinal connections and bridgings; feet-lock bolts are constructed at vaults on the two sides of the vertical steel supports; mortar bolts are constructed at arch springs on the two sides of the vertical steel supports; the vertical steel supports, the cross connections, the longitudinal connections, the bridgings, the feet-lock bolts and the mortar bolts form a reinforcement framework; the reinforcement framework is poured with concrete to form a concrete solid column in size of 2.0*2.0m-4.0*4.0m; the interval between every two concrete solid columns in a whole tunnel is 4-8m; and a steel arch injection concrete enclosed wall body is arranged between every two concrete solid columns. With the adoption of the technology, on the premise that construction safety is ensured, the construction period of a project is shortened by 15% entirely, and construction cost is saved by 6% approximately.