Construction method for full-casing full-slewing drilling machine pile foundation adjacent to subway

Abstract

The invention discloses a construction method for a full-casing full-slewing drilling machine pile foundation adjacent to a subway. The construction method comprises the following steps that S2, a full-slewing drilling machine is placed in place, the center of a base of the full-slewing drilling machine is aligned with the center of a pile placing position, and the base is adjusted to a horizontal state; S3, steel casing sections are connected on site to reach the preset length of a pile casing, and a drill bit is arranged at the end of the first steel casing section; S4, the pile casing is hoisted and the pile casing is connected with the full-slewing drilling machine; S5, the pile casing is vertically driven into a soil layer, a pile hole is sequentially divided into an upper section, a middle section and a lower section from top to bottom for construction, and the subway structure is located within the range of the middle section; S6, after the drilled hole reaches the required depth and the pile hole is checked to be qualified, the hole is cleaned; and S7, a reinforcement cage is hoisted, and in the hoisting process, the reinforcement cage is kept vertical all the time and is coaxial with the pile casing. The construction method for the full-casing full-slewing drilling machine pile foundation adjacent to the subway has the effects that disturbance of pile foundation construction to soil around the subway tunnel is reduced, hole collapse is not prone to occurring, and safety risks caused by pile foundation construction to the subway structure and subway operation are reduced.

Description

technical field [0001] The invention relates to the field of pile foundation construction adjacent to subways, in particular to a construction method for pile foundations of a full-casing and full-rotation drilling rig adjacent to subways. Background technique [0002] In recent years, with the rapid development of urban subways, the construction of buildings adjacent to subways has increased rapidly. [0003] In related technologies, conventional bored pile construction schemes are usually used for pile foundation construction near the subway. Since bored piles are prone to collapse and other problems during the construction process, the disturbance to the soil around the subway tunnel is relatively large, and the safety lower. [0004] Based on the above related technologies, it is necessary to propose a pile foundation construction method that reduces the disturbance to the soil structure around the subway tunnel. Contents of the invention [0005] In order to reduce ...

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Problems solved by technology

[0003] In related technologies, conventional bored pile construction schemes are usually used for pile foundation construction near the subway. Since bored piles are prone to collapse and other problems during the construction process, the disturbance to the soil around the subway tunnel is relatively large, and the safety lower

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