Manual hole digging non-uniform pile support construction technology

Abstract

The discloses a manual hole digging non-uniform pile support construction technology for construction along the inner side of the former support structure, the construction steps are as follows: (1) digging the first order, the second order and the third order hole digging piles according to the process of every three for one; (2) forming crown beam at the top of pile for enhancing support structure integral rigidity, having layering construction for horizontal support or anchor cable according to the design calculation requirement, after getting the design strength requirement, excavating the foundation trench earthwork to the bottom in the foundation trench; (3) making level for the manual hole digging non-uniform pile, having the water proof construction, making the basement bottom plate, casting the bottom plate concrete with the former support pile; (4) removing the second strengthening anchor cable or removing the support, finishing the basement structure; (5) extending the rebar in the hollow part of the manual hole digging pile into the basement bottom plate as basement structure pile and anti-floating pile. The manual hole digging non-uniform pile support construction technology solves the problem that the big diameter strengthening support pile construction machinery cannot be contained for the inner support at upper part or convex waist beam while the remain construction space between the support pile and the basement outer side line is small.

Description

technical field [0001] The invention relates to foundation pit reinforcement technology, in particular to a technology for foundation pit support and reinforcement in a narrow space in a foundation pit with artificially dug holes with variable-section special-shaped piles. Background technique [0002] With the rapid development of social economy and the expansion of urban construction scale, the tension of urban land use has become increasingly prominent, and people have begun to develop and utilize underground space more. In order to ensure the safety and normal use of buildings (structures) around the foundation pit, underground pipelines and roads, and provide construction space for the basement structure. For deep foundation pit excavation with large excavation depth (generally greater than 10m) and poor geological conditions, φ800-1200mm large-diameter reinforced concrete piles or φ800-1000mm thick underground diaphragm walls combined with anchor cables (or supports) a...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a manual excavation variable cross-section pile support construction technology, which solves the problems caused by the small remaining construction space between the original support pile and the basement outdoor edge, or the existence of internal support on the upper part, and the protruding waist beam. Large-diameter reinforcement and support pile construction machinery cannot be placed and it is difficult to construct, or there has been a dangerous situation, and the deformation of the original support structure must be strictly controlled after backfilling and backpressure, or the foundation pit with poor soil conditions needs to be deepened, supported or reinforced.

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