Construction method of arched steel lifting molds of tunnel secondary lining arch foot curved wall

Abstract

The invention relates to a construction method of arched steel lifting molds of a tunnel secondary lining arch foot curved wall. The method comprises the following steps: (1) a thick steel plate of 12 mm is machined to two needed shaping steel lifting molds with different arc lengths by a machine tool according to an actual tunnel design arch foot curve and a road surface cross slope; the widths of the two shaping steel lifting molds are both 150 cm; and connecting hinges are both arranged in the middles of the two shaping steel lifting molds; (2) the connecting hinges of the two shaping steel lifting molds are respectively connected with foot connecting hinges at the two sides of a trolley gantry through lead screws; (3) support lead screws are arranged on the connecting hinges for supporting inverted arched filled in cutting grooves; (4) longitudinal joints of the two shaping steel lifting molds are connected by two movable large hinges; and (5) the lengths of the lead screws are adjusted to enable the two shaping steel lifting molds and a main mold to form a design curved wall curve; and the lead screws are shortened in demolding to inwards and upwards retract the two shaping steel lifting molds. The construction method can realize the purposes of flexible walking of a trolley and once casting of the curved wall.

Description

technical field [0001] The invention relates to the technical field of concrete construction for the second lining of tunnels, in particular to a construction method for the arc-shaped steel hanging form of the arch foot curved wall of the second lining of the tunnel. Background technique [0002] The concrete construction of the second lining of the tunnel is the key control process of the tunnel construction. The construction of the second lining of the tunnel is firstly filled with inverted arches and inverted arches, and then the second lining of the arch wall is poured on the entire section at one time. Height restriction (the range of movement of the trolley surface formwork is small, and it is difficult to reduce the trolley to a safe and flexible walking height and width due to the influence of the panel), and in the traditional process, there is no formwork at the bottom of the two sides of the tunnel lining trolley, so it must be done in advance Concreting of the s...

AI Technical Summary

Problems solved by technology

[0002] The concrete construction of the second lining of the tunnel is the key control process of the tunnel construction. The construction of the second lining of the tunnel is firstly filled with inverted arches and inverted arches, and then the second lining of the arch wall is poured on the whole section at one time. Height restriction (the movable range of the surface formwork of the trolley is small, and it is difficult to reduce the trolley to a safe and flexible walking height and width due to the influence of the panel), and in the traditional process, there is no formwork at the bottom of the two sides of the tunnel lining trolley, so it must be done in advance Concreting of the short side walls on both sides, followed by concrete pouring of curved walls, involves two processes, which consumes manpower and material resources, and the construction of small side walls is difficult to achieve the corner curve required by the design; in addition, the slow construction progress of the traditional second lining increases the safety distance , which is undoubtedly a fatal shortcoming in tunnels with poor surrounding rocks, and poses a great safety hazard

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