Prestressed inclined pile support and construction method thereof

Abstract

The invention relates to a prestressed inclined pile support. The prestressed inclined pile support comprises an inclined pile support body, a circuit purlin, an anti-pulling device and a loading device, wherein the inclined pile support body is driven into soil before a foundation pit is excavated; the anti-pulling device is movably connected with the inclined pile support body in the axial direction; the loading device applies axial prestress to the inclined pile support body by taking the anti-pulling device as an acting point; and the anti-pulling device is fixed in the circuit purlin in advance, and the loading device is arranged at the part, extending out of the circuit purlin, of the upper end of the anti-pulling device. According to the prestressed inclined pile support, a prestress applying device is applied before excavation, so that the bearing capacity of an inclined pile is quickly exerted; the prestress applying device is additionally arranged on an existing inclined pilesupport, reverse thrust can be provided for the inclined pile support through a force transmission device, the inclined pile deforms in advance, and therefore the bearing capacity of the inclined pile is quickly exerted; the prestress applying device can be recycled; and the prestress applying device of the inclined pile is located on the outer side of a ring beam and is wide in application rangeand capable of extending to the ground, so that the situation that the ring beam falls, so that the ring beam is influenced by underground water is avoided.

Description

technical field [0001] The invention relates to a diagonal bracing device used in a foundation pit, in particular to a prestressed diagonal pile support and a construction method thereof, belonging to the technical field of foundation pit engineering. Background technique [0002] As a temporary support structure for foundation pit engineering, oblique grouted steel pipe braces not only increase the working space in the pit, but also reduce the cost of the support system, which has good application and promotion value. However, in the actual implementation process, only when the top of the oblique grouted steel pipe has a certain deformation can it provide a more reliable bearing capacity, which is not conducive to the deformation of the foundation pit and the protection of the surrounding environment. [0003] The publication date is September 4, 2013, and the Chinese patent document with the publication number CN103276739A discloses "a foundation pit support structure with...

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Problems solved by technology

However, in the actual implementation process, only when the top of the oblique grouting steel pipe has a certain deformation can it provide a more reliable bearing capacity, which is not conducive to the deformation of the foundation pit and the protection of the surrounding environment

[0003] The publication date is September 4, 2013, and the Chinese patent document with the publication number CN103276739A discloses "a foundation pit support structure with inclined pile supports and prestressed purlins", which discloses the use of oblique steel The idea of ​​installing a loading device at the bottom of the support to actively apply prestress, however, setting the loading device on the bottom plate can only be implemented after the earthwork is completely excavated, and it is difficult to recover the loading device; and because the loading device is set on the bottom plate Above, the loading device is far away from the control system at the side of the pit, and the connection line between the loading device and the control device at the side of the pit affects the excavation of the earthwork at the side of the pit and the construction of the main underground structure

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