Construction method for basement of subway station

Abstract

The invention discloses a construction method for a basement of a subway station. The construction method is characterized in that electroosmosis wells are arranged on the outer edge of a basement support and are uniformly arranged along the outer edge of the basement support, and plastic films cover topsoil between slope protection piles and the electroosmosis wells; the basement support adopts a mode of setting side slopes twice, first side slopes are set at parts from the ground surface to the 2 / 3 depth of the basement, high-strength composite battens are arranged at the parts of the first side slopes, and the high-strength composite battens at the upper parts are shorter than the high-strength composite battens at the lower parts; second side slopes are set at parts from the 2 / 3 depth of the basement to the bottom of the basement; anchor rods are arranged at the parts of the second side slopes, and the downward dip angles of the anchor rods are gradually increased from top to bottom; the surface layers of the second side slopes adopt high-strength composite batten bamboo strip nets, and shotcrete is used as concrete on the surface layers; depressurization wells are arranged in the middle of the basement at an interval of every 12-15m, and the diameters of the depressurization wells are 600-700mm; concrete pipes are adopted for protecting walls; water filtering pipes are arranged in confined water parts, the outer sides of the water filtering pipes are wound by nylon gauze, and the water filtering pipes are filled with a 2-4mm pisolite filter material; and clay balls are used as a hole sealing material.

Description

technical field [0001] The invention relates to a basement support, in particular to a basement construction method of a subway station. Background technique [0002] With the development of our country's social economy, the construction of subway stations will inevitably cause the disturbance of the surrounding soil. When the displacement of the surrounding soil layer exceeds the limit range, it will endanger the safety of the surrounding buildings (structures). When the basement is excavated and dewatered, due to changes in the stress conditions of the soil, the soil around the basement will be displaced and the corresponding ground deformation will occur. At the same time, the basement support system will also be affected by the lateral water and soil pressure to generate internal force and deformation. In addition, if internal supports are installed inside the basement, it will not only increase the construction cost, but also bring great inconvenience to the excavation...

AI Technical Summary

Problems solved by technology

In addition, if internal supports are installed inside the basement, it will not only increase the construction cost, but also bring great inconvenience to the excavation.

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