Pile forming construction method for complex geological pile foundation

Abstract

The invention relates to the technical field of complex geological pile foundation construction, and particularly discloses a pile forming construction method for a complex geological pile foundation. When the content of karst caves and cracks reaches 70% or above, the karst caves and the cracks are injected to be compact through karst grouting, and then pile foundation drilling is conducted; and when the content of the karst caves and the cracks of the pile foundation reaches 30% or below, pile foundation drilling is conducted through a follow-up steel casing. According to the pile forming construction method for the complex geological pile foundation, the influence of complex geology on pile foundation construction is effectively avoided, the construction quality is effectively improved, construction is conducted according to the different occupied amounts of the karst caves and the cracks in each pile foundation through different methods, and the construction cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a pile-forming construction method for pile foundations in complex geological conditions. Background technique [0002] The construction of pile foundation is carried out under the geological environment conditions of large-scale karst, fissures and beaded caves, and extremely rich groundwater. The difficulties of pile foundation hole formation, difficult quality control, and construction schedule are all important and difficult points of this project. The karst is widely distributed, the number of layers of karst caves is large, and the height of a single layer is large. During the construction process, there are the following possible situations: [0003] After drilling through the karst cave, the mud will be lost, and the mud level will drop rapidly, causing the hole to collapse, and may also cause the surface to collapse. This kind of problem is easy to o...

AI Technical Summary

Problems solved by technology

[0006] Even if reliable measures have been taken to prevent the hole from collapsing during the drilling process, when the underwater concrete is poured, after the pouring reaches a certain height, the ash-stopping surface suddenly drops, and the ash-stopping surface is exposed at the bottom of the conduit, resulting in broken piles;

[0007] Even if holes can be formed, when the concrete is poured underwater, when the ash-stopping surface reaches a large-scale karst cave, a large amount of concrete will flow into the karst cave, and the ash-stopping surface cannot rise for a long time. After a long time, the surface will solidify, resulting in broken piles;

[0008] Other problems encountered: the bored piles in the karst area generally go deep into the rock, the construction period is long, and the mechanical equipment wears out quickly. Often, the wire rope breaks and the drill bit falls into the hole due to careless inspection during the drilling

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