Method for reinforcing water-rich silt strata by obliquely arranging multiple rows of freezing pipes

Abstract

The invention discloses a method for reinforcing water-rich silt strata by obliquely arranging multiple rows of freezing pipes. The method comprises the following steps of 1, conducting surveying andsetting out; 2, conducting drilling with casing; 3, obliquely arranging the multiple rows of freezing pipes; and 4, reinforcing the water-rich silt strata. According to the method, before excavation,silt soil layers on the two sides of a groove wall to be subjected to excavation are obliquely frozen and reinforced to form oblique reinforced pile walls, the distance between the upper portions of the reinforced pile walls is wide, and the distance between the lower portions of the reinforced pile walls is narrow; the side wall of the groove wall to be subjected to excavation can be reinforced,the bottom can be effectively frozen and reinforced, so that the enough strength is achieved, engineering accidents such as water gushing are prevented, and the groove wall collapse possibility in theexcavation process of an underground diaphragm wall can be effectively reduced; and the method is suitable for excavation of silt sand inclusion layers and high underground water levels, it is guaranteed that follow-up excavation construction is safely, reliably and smoothly carried out, the practicability is high, and the effect of reducing pollution can also be achieved.

Description

technical field [0001] The invention belongs to the technical field of freezing and strengthening of water-rich silt sand formations, and in particular relates to a method for reinforcing water-rich silt sand formations by obliquely arranging multiple rows of freezing pipes. Background technique [0002] During the excavation of the foundation pit, the construction of the underground diaphragm wall, as an indispensable part, will have a huge impact on the overall safety and quality of the construction. Especially in the process of trenching the underground diaphragm wall, poor groundwater head or heavy silty soil layer will affect the stability of the trench wall, and even cause collapse and other accidents that endanger the construction quality. In the existing construction technology, one is to consider using the attachment pressure of the mud retaining wall to balance the soil pressure of the groove wall, but it may not be completely balanced in complex strata with a high...

AI Technical Summary

Problems solved by technology

Especially in the process of opening the underground diaphragm wall, the poor groundwater head or the existence of heavy silty soil layer will affect the stability of the groove wall, and even cause accidents such as collapse of the groove that endanger the construction quality.

In the existing construction technology, the first consideration is to use the attachment pressure of the mud retaining wall to balance the soil pressure of the groove wall, but it may not be completely balanced in complex strata with high groundwater levels

The second is to use cement mixing piles to reinforce the surrounding soil, but there are also problems such as long construction period and large environmental pollution.

In the existing similar technologies, the technical solutions are mostly concentrated in the excavation of underground tunnels such as connecting passages by the horizontal freezing method, or the reinforcement of soil in key processes such as the entry and exit of the shield machine, and the excavation of shafts or shield tunnels by the vertical freezing method Excavation is also more common, but the control process of the vertical freezing method is likely to cause a large area of ​​the excavation area to be frozen, resulting in difficulties in subsequent excavation

Images