Construction technology of step temporary support and partial double side walls

Abstract

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.

Description

technical field [0001] The invention relates to IV-V grade sandy mudstone and sandstone as the main surrounding rocks, and underground excavation of super-large section tunnels of 300-350m in subway stations 2 Excavation process. Background technique [0002] During the excavation of subway stations, especially in the excavation of super-large cross-section tunnels, there are great potential safety hazards. Some construction techniques are slow in progress, high in cost, and inefficient in the use of personnel and machinery in practical application. At present, due to the traffic demand in the construction of subways in major cities, it is more common to use super-large cross-section stations or three-dimensional intersections. In order to speed up the construction progress, reduce costs and eliminate potential safety hazards, a brand-new construction technology for submerged underground tunnels with large cross-sections has been formed. Contents of the invention [000...

AI Technical Summary

Problems solved by technology

[0002] During the excavation of subway stations, especially in the excavation of super-large cross-section tunnels, there are great safety hazards

Some construction techniques are slow in progress, high in cost, and inefficient in the use of personnel and machinery in practical application

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