The invention relates to the technical field of deep foundation pit support construction methods, the invention discloses a construction method of a double-
pipe inclined support deep foundation pit. The two long steel pipes are arranged side by side, the method comprises the following steps of 1, reserving counter-pressure soil on the foundation pit; 2, marking the mounting position of the long steel
pipe; 3, arranging a lattice column, wherein the lattice column is provided with a fixing structure; 4, a
waist beam part is arranged at the upper end part of the supporting
pile, a support is arranged at the bottom of the foundation pit; 5, the plurality of sections of steel pipes are in
butt joint to form a long steel
pipe, according to requirements, the long steel pipes are connected witha plurality of sections of connecting pipes, and the connecting pipes are fixed on the
waist beam parts; 6, prestress is applied for multiple times, after the prestress is applied in place, the movable end is fixed; 7, the construction and acceptance are carried out, and the counter-pressure soil is excavated to reach the designed elevation. Under the action of the lattice columns, the partial length-to-thin ratio of the long steel pipes is reduced, and the arrangement stability of the long steel pipes is improved, the two long steel pipe combinations and the lattice column are matched for supporting the foundation pit, the supporting stability of the deep foundation pit is enhanced, and the support of the deep foundation pit is guaranteed.