Processing method of pile-wall type deep base pit supporting structure in case of encountering large boulder stone

Abstract

The invention discloses a processing method of a pile-wall type deep base pit supporting structure in the case of encountering a large boulder stone. The method comprises the following steps: 1, when the pile-wall type deep base pit supporting structure encounters a boulder stone during construction, the construction is stopped, and earthwork is back filled to the ground; 2, a pore-forming machine is adopted for drilling from the ground and piercing in the boulder stone; 3, a soil-blocking structure under the boulder stone is processed; and 4, the hole is continuously formed from the ground to the top surface of the boulder stone according to the original plan scheme. In the invention, the small hole is drilled until the boulder stone is pierced and then the soil-blocking sealing structure under the boulder stone is processed without crushing the boulder stone, which is combined with the original supporting structure to form a new supporting structure. The processing mode has small destroy on the peripheral stratums, thereby effectively ensuring the completeness and stability of peripheral medium; and the construction is simple, the time and cost are saved and the safe operation is ensured, thus the method can be widely applied in the processing of pile-wall type deep base pit supporting structure in the case of encountering the large boulder stone.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a method for treating large boulders encountered in a pile-wall type deep foundation pit support structure. Background technique [0002] At present, the deep foundation pit support structure for vertical soil retaining or water stop is nothing more than punching (drilling) hole row piles, underground diaphragm walls, deep mixing piles, rotary grouting piles, three-axis mixing piles, steel sheet piles, etc. However, when encountering obstacles such as boulders during the construction process, people usually use hammer impact crushing, blasting, manual cleaning under auxiliary measures and other processing methods. [0003] Among them, impact hammer crushing is more effective for stone obstacles with small diameters. The impact hammer can be repeatedly impacted to crush, squeeze out or be carried out by the mud. For larger block diameters, hammer impact crushing has disadvant...

AI Technical Summary

Problems solved by technology

For larger block diameters, hammer impact crushing has disadvantages such as long time, large equipment loss, high power consumption, and poor economy. Blasting has disadvantages such as large vibration, high noise, many safety hazards, and poor economy.

Manual cleaning requires complex auxiliary measures such as reducing groundwater, reinforcing soil, or erecting wall protection steel cylinders, which has disadvantages such as long processing time, poor working environment, and many safety hazards.

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