Construction method for subway stations in combined construction of highway and subway

Abstract

The invention belongs to the technical field of underground space construction, and particularly relates to a construction method for subway stations in combined construction of highway and subway. The method specifically comprises the following steps: S1 constructing an underground continuous wall and casting a plurality of column piles on the inner side of the underground continuous wall; S2 aligning steel pipes and hoisting the steel pipes on the column piles and pouring concrete to form intermediate columns and side span columns of a concrete steel pipe structure; S3 constructing structural roofs and intermediate structure layers from top to bottom gradually and excavating a soil body below a plate till pouring of a structural base slab is completed; S4 constructing structural side walls from bottom to top layer by layer and simultaneously constructing side span structure inner walls and highway tunnel structure inner walls; S5 cutting off the intermediate columns and the side spancolumns of the top layer to complete the construction. The method can effectively solve the problem that the stress conversion multilayer underground structure is difficult to construct, ensures smooth stress conversion of the main body structure, meanwhile can reasonably control the cost, ensures the safety of a foundation pit and the external structures, and is suitable for the construction ofthe subway stations in combined construction of the highway and the subway.

Description

technical field [0001] The invention belongs to the technical field of underground space construction, and more specifically relates to a construction method for a subway station jointly built by public roads and railways. Background technique [0002] With the increasing shortage of above-ground space, the underground space will inevitably develop in the direction of larger scale, deeper depth and more complex functions. Underground multi-layer force transfer structures will gradually increase. Integration saves space resources, relieves urban traffic pressure, and is more and more used in urban traffic construction. [0003] Further research found that because the top floor of the "highway-rail joint construction" station is a road tunnel, the lower layer of the road tunnel is the station hall floor and platform floor of the subway station in turn. The secondary stress transformation with discontinuous vertical stress on the storey has the following technical problems dur...

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Problems solved by technology

[0003] Further research found that because the top floor of the "highway-rail joint construction" station is a road tunnel, the lower layer of the road tunnel is the station hall floor and platform floor of the subway station in turn. The secondary stress transformation with discontinuous vertical stress on the storey has the following technical problems during construction: (1) construction difficulties due to the large depth of the station and the complex surrounding environment; (2) the structural change of the main structure from top to bottom, resulting in The force conversion is discontinuous, (3) may cause deformation of surrounding buildings, and the safety of the foundation pit itself and external structures is difficult to guarantee, (4) the project cost is high

The underground stations of "highway-rail joint construction" are usually large in scale and deep, and the clearance and layout of highway tunnels and stations are different, so it is difficult to ensure the continuous force of the structure in the vertical direction, and the traditional construction method is difficult to ensure the smooth implementation of the project

In addition, the underground stations of "co-construction of highways and railways" are usually located in busy traffic areas, and do not have the conditions for open-excavation construction; the thickness of the covering soil above the stations is small, and the soil is soft, and it is difficult to use underground excavation for construction

Based on a comprehensive comparison, the cover-and-excavation method was selected for construction. However, due to the discontinuous force on the station structure in the vertical direction, the standard cover-and-excavation method and the cover-excavation method cannot meet the construction requirements.

[0005] In view of the above technical problems, there is an urgent need to design a new construction method in this field, so that it can avoid problems such as difficult construction and discontinuous force transfer during the construction process, and meet the construction needs of the "road-rail joint construction" project

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