Construction method for pile body at joint of underground excavation station and shield area

Abstract

The invention relates to a construction method for a pile body at a joint of an underground excavation station and a shield area, and belongs to the technical field of subway station construction. The construction method comprises the following steps: S1, constructing a first reinforced concrete pile and a plain pile below an interval segment at a tunnel portal; S2, pouring mortar into the upper portion of the plain pile to an inverted arch of a transverse channel; S3, feeding a shield grinding pile into the station; and S4, digging a hole to construct a second reinforced concrete pile above the segment, and then constructing a pile top beam. The second-layer transverse passages of the vertical shafts at the two ends of the station can be fully utilized; after a shield passes through, secondary construction of upper piles is conducted, shield segments and pile bodies above are stably connected, during follow-up station earthwork excavation and inter-pile hanging net anchoring and shotcreting construction, safety and quality risk hidden dangers such as pile body inclination and instability of the pile bodies and surrounding soil bodies are avoided, treatment is not needed in the later period, and construction period delay is avoided; the shield pile grinding time is greatly shortened, and meanwhile, abrasion to a cutter head of a shield tunneling machine is reduced; and when the segment nearby the position is detached, looseness is not prone to being caused.

Description

technical field [0001] The invention relates to the technical field of subway station construction, in particular to a method for constructing piles at the junction of a submerged station and a shield section. Background technique [0002] A subway station is a place where railway trains stop for the urban rail transit system (abbreviated as the urban rail system) to carry goods or allow passengers to ride. Subway stations at this stage do not refer to stations built below the ground, but to stations set along the subway system, which can be built underground, semi-underground, or on the ground or elevated. [0003] During the construction of the subway station, in order to facilitate the passing of the shield tunneling piles, the end piles at the junction of the station and the tunnel portal of the shield section are made of glass fiber reinforced piles. The current construction method has the following problems: 1. The horizontal clearance in the cross passage of the shaf...

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Problems solved by technology

[0003] During the construction of the subway station, in order to facilitate the passing of the shield tunneling piles, the end piles at the junction of the station and the tunnel portal of the shield section are made of glass fiber reinforced piles. The current construction method has the following problems: 1. The horizontal clearance in the cross passage of the shaft is 4m. After the construction of the inner crown beam of the cross passage is completed, the clearance in the lower part of the cross passage is reduced to 2.1m, which greatly reduces the utilization rate of the cross passage; The pile body is in a cantilever state. During the subsequent earthwork excavation of the station and the anchor spraying construction between the piles, there are prone to safety and quality risks such as pile body tilting, pile body and surrounding soil instability, and post-processing may cause construction delays. Delay; 3. It takes a long time to grind piles when the shield passes through the station; 4. Because the pile body is in a cantilever state, the soil on the top of the segment here is unstable, and the embedded force between the segment and the surrounding soil is reduced. When the segment near the door is removed, it is easy to cause the segment to loosen

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