Deep foundation pit earthwork digging method

Abstract

The invention relates to a deep foundation pit earthwork digging method. The method comprises the following steps of: (1) after paying-off measurement of a deep foundation pit is finished, designing N layers of horizontal supporting steel plates according to the deep foundation pit engineering conditions in the deep foundation pit from top to bottom, and digging the foundation pit earthwork layerby layer by adopting an island type digging method, wherein N is more than or equal to 1 and less than or equal to 20; (2) downwards driving an outside steel plate pile along the wall of the deep foundation pit; and (3) digging the earthwork above the first layer of horizontal supporting steel plate, welding one end of the first layer of horizontal supporting steel plate to the outside steel plate pile, downwards driving an inside steel plate pile at the other end of first layer of the horizontal supporting steel plate and the like, constructing the Nth layer of horizontal supporting steel plate, building a ramp, digging the earthwork below the Nth layer of horizontal supporting steel plate, regressing, digging the ramp, removing the inside steel plate pile, digging the rest earthwork, and thus finishing digging the earthwork of the deep foundation pit. The construction method is simple and feasible; a trestle is not required, the construction period is effectively quickened, and the digging cost of the earthwork of the deep foundation pit is reduced; and the deep foundation pit earthwork digging method is safe and reliable.

Description

technical field [0001] The invention belongs to the field of earth excavation, in particular to an earth excavation method for a deep foundation pit. Background technique [0002] For large-scale deep foundation pits with high environmental requirements, especially deep foundation pits on soft soil foundations, foundation pit support is often used instead of large excavation. For the convenience of earthwork excavation, most foundation pit trestles are set up, so that the excavator can directly stand on the trestle to quickly dig soil. Some projects do not set trestle bridges for various reasons, but set soil ramps in the foundation pit, which extend from the upper part of the foundation pit extension to the bottom of the foundation pit, and excavators and earthmoving vehicles enter the foundation pit from the ramp to dig away the soil . When setting multi-level horizontal supports according to the depth of the foundation pit for excavation by excavators and earthmoving ve...

AI Technical Summary

Problems solved by technology

The more horizontal supports are set, the more times the ramp needs to be cleared and restored, resulting in extended construction period, increased cost, and increased construction difficulty

If the soil quality in the excavation range is not good, such as silty soil, it is difficult to recover, and the cost of repeatedly building ramps is high

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