Construction process for double-line large-section split lining trolley in underground excavation section of subway

Abstract

The invention discloses a construction technology for a double-line large-section split lining trolley in a subway underground excavation section. The construction technology comprises the steps of temporary support dismantling, base surface treatment construction, waterproof engineering construction, reinforcing steel bar engineering construction, formwork erecting and dismantling and concrete pouring, secondary lining back pouring and construction joint and deformation joint treatment. The construction method has the beneficial effects that according to interval large-section secondary lining construction, an interval large section is divided into an inverted arch, a side wall and an arch part for construction, the breaking amount of a temporary supporting structure during construction of each bin is reduced, stratum disturbance is reduced, material turnover and consumption are reduced, a limited space is fully utilized for continuous operation, and in the walking and mold closing and removing process, the construction efficiency is greatly improved. Compared with the prior art, the construction safety is improved, compared with integral formwork construction, in the concrete pouring process, a flat plate vibrator can be installed on the lining trolley for vibration, the compactness of concrete is improved, the construction time is shortened, the assembly time is shortened, and the construction speed is greatly increased.

Description

technical field [0001] The invention relates to a construction technique for a secondary lining in a subway undercut area, in particular to a construction technique for a two-line large-section split lining trolley in a subway undercut area, which belongs to the field of tunnel construction. Background technique [0002] With the steady progress of China's urbanization construction, the population size of large cities, especially megacities, is increasing year by year. However, with the continuous expansion of the size of cities, the problem of traffic congestion has become one of the difficult problems restricting urban economic development. Rail transit, represented by the subway, has become an important means to solve the traffic congestion in megacities. [0003] In the construction of the subway section, the large section of the parking line section is difficult to control because of its large section, and the timely closure of the secondary lining construction is parti...

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Problems solved by technology

[0003] In the construction of the subway section, the large section of the parking line section is difficult to control the settlement due to its large section, and the timely closure of the secondary lining construction is particularly important. At present, the large section of the secondary lining excavated by the existing construction method is affected by space and Due to frequent process changes, it is not feasible to use integral lining trolleys, and the construction method of scattered arch frames is generally used

According to the monitoring data of the excavation process, the length of the temporary support cannot meet the requirements of the assembly line construction. In addition, during the construction of each storehouse, the temporary support structure is removed a lot, which disturbs the ground more, increases the turnover and consumption of materials, and cannot make full use of the limited space. Continuous operation, in the process of walking, mold closing and demoulding, the safety of construction is revealed. In terms of construction time, it takes a lot of assembly time, resulting in the construction speed not being improved.

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