A non-destructive removal device for abandoned piles in complex strata

Abstract

The invention provides a nondestructive pile drawing machine. The nondestructive pile drawing machine comprises a sleeve and a base, wherein an upper ring seat is fixed on the base, a lower ring seatis arranged on the inner wall of the lower part of the upper ring seat, an annular toothed belt is arranged on the outer circumferential wall of the lower ring seat, two through holes are formed in the lower part of the upper ring seat, a plurality of bearing plates are arranged on the outer circumferential wall of the upper part of the upper ring seat in the circumferential direction of the upperring seat, a plurality of ejection cylinders are arranged on the base, and the output ends of the ejection cylinders are connected with the bearing plates; and a plurality of secondary cylinders arearranged on the inner circumferential wall of the upper portion of the upper ring seat in the radial direction of the upper ring seat, a secondary clamping head is installed on each secondary cylinder, a plurality of primary cylinders are arranged on the inner circumferential wall of the lower ring seat in the radial direction of the lower ring seat, and a primary clamping head is installed on each primary cylinder. According to the nondestructive removal device, the sleeve is put on the periphery of the foundation pile, so that the foundation pile is isolated from an external soil layer, andthen the upper ring seat and the lower ring seat are used for respectively carrying out vertical lifting and annular rotation on the foundation pile; and the purpose of pile pulling is achieved through alternate execution of lifting and rotating actions.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a device for non-destructively removing abandoned engineering pile foundations, enclosure anchor piles or other columnar reinforced concrete structures remaining in complex strata. Background technique [0002] With the rapid development of the national economy and the continuous acceleration of the urbanization process, the resident population of cities in my country is increasing year by year. The contradiction between the rising population and the increasingly scarce land resources is intensifying. Major cities have set off a wave of underground space development. The development and utilization of underground space can not only greatly relieve urban traffic pressure such as underground railways and underground parking lots, but also expand the activity space of citizens such as underground commercial streets and underground museums. In terms of energy savin...

AI Technical Summary

Problems solved by technology

However, in order to maximize the load-bearing effect of the pile foundation, the pile tip needs to be inserted into the bedrock layer below the soil layer. Therefore, the buried depth of the foundation pile ranges from a dozen meters to tens of meters or even hundreds of meters. The side friction resistance between soil bodies is relatively large, especially for foundation piles that have remained in complex strata for a long time, the cohesive force has accumulated over time, and the side friction resistance has increased significantly. Even if modern large-scale lifting equipment is used, it is difficult to directly remove the entire root; To solve the problem of difficult removal of foundation piles in complex strata, the applicant designed a non-destructive removal device for abandoned piles. The ring seat and the lower ring seat carry out vertical lifting and circular rotation on the foundation pile respectively, and they are pulled out from the soil by alternately performing lifting and rotating processes to realize obstacle removal

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