Earth excavation technology for ultra-large type deep foundation pit

Abstract

The invention relates to an earth excavation technology for an ultra-large type deep foundation pit. The earth excavation technology for the ultra-large type deep foundation pit comprises the following steps that (1) after measurement, a plurality of regions are divided, and earth slope roads are arranged between the regions; (2) a basin-type excavation technology is adopted in the foundation pit boundary regions, wherein construction is conducted on middle earth at first, then construction is conducted on ring-edge earth, and a slope supporting structure is constructed in time; (3) an island-type excavation technology is adopted in the foundation pit middle regions, construction is conducted on earth of the adjacent boundary regions, then construction is conducted on middle earth, and stable transition with the adjacent regions is considered comprehensively; (4) the regions are excavated and supported layer by layer, overexcavation is strictly prohibited, mechanical excavation is primary, manual construction and excavation are secondary, and it is guaranteed that undisturbed earth is not damaged; (5) a reverse-type excavation technology is adopted in the earth slope roads, and excavation is conducted from bottom to top step by step. Intercepting ditches are formed in the periphery of the foundation pit, drainage ditches and water-collecting wells are formed in the construction regions, and accumulated water is discharged in a concentrated mode. The earth excavation technology for the ultra-large type deep foundation pit has the advantages that the advantages of the island-type excavation technology and the advantages of the basin-type excavation technology are brought into full play, the construction procedures are linked effectively, the progress of operation is rapid, the time effect is reduced effectively, and safety is high.

Description

technical field [0001] The invention relates to the field of foundation pit earthwork excavation, in particular to an ultra-large deep foundation pit earthwork excavation technology. Background technique [0002] At present, with the continuous development of urban construction and the continuous expansion of building scale, large deep foundation pits have become one of the hot and difficult issues in geotechnical engineering. For large deep foundation pits, for the convenience of earthwork excavation and transportation, foundation pit trestles are generally set up, and the construction method of island excavation is used. This method is beneficial for speeding up the earthwork transportation and increasing the excavation speed, but it is unfavorable for the force of the supporting structure. Since the soil around the foundation pit is excavated first, the time effect of the supporting structure is longer, and the supporting structure may be enlarged. The amount of deforma...

AI Technical Summary

Problems solved by technology

This method is beneficial for speeding up the earthwork transportation and increasing the excavation speed, but it is unfavorable for the force of the supporting structure. Since the soil around the foundation pit is excavated first, the time effect of the supporting structure is longer, and the supporting structure may be enlarged. The amount of deformation caused certain hidden dangers in construction safety and increased construction costs

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