Simple method for judging and managing open type frozen window

Abstract

The invention discloses a simple method for judging and managing an open type frozen 'window', and belongs to a method for managing a permeable 'window' of a frozen wall. The simple method particularly includes preliminarily judging whether abnormal freezing conditions exist or not, densely setting temperature measuring points in a temperature measuring hole if the abnormal freezing conditions exist, and preliminarily judging a particular position of the frozen 'window' according to measured temperatures; stopping freezing a local frozen pipe for about 3 hours, arranging temperature measuring points in the frozen pipe, further judging an accurate position of the frozen 'window' according to a temperature measuring condition and analyzing reasons for forming the frozen 'window'; eliminating influence of water flow to freezing by a grouting plugging or water flowing channel relieving process, and then continuing to freeze the frozen pipe; and quickly freezing the frozen pipe in a breakthrough manner by the aid of liquid nitrogen when a freezing effect is not perfect, and maintaining freezing after a perfect freezing effect is realized. The simple method has the advantages that the method is simple and feasible, the position of the permeable 'window' can be judged accurately, the method for managing the open type frozen 'window' is high in pertinence, and the difficult problem that an existing open type frozen 'window' cannot be judged and is managed blindly is solved.

Description

technical field

[0001] The invention relates to a simple judgment and treatment method of an open freezing window, which belongs to the judgment and treatment method of a water-permeable window of a frozen wall. It is mainly suitable for judging the exact location and carrying out targeted treatment when there is a permeable window when the urban municipal opening freezes. Background technique

[0002] Freezing construction in strata with high groundwater flow rate may cause permeable windows in the frozen wall. However, the commonly used methods to detect the freezing effect in the past are mainly based on the change of water level in the hydrological observation hole or the pressure change of the pressure relief hole. Judging the intersection situation; using the temperature distribution of the measuring points in the temperature measuring hole to obtain the expansion speed of frozen soil and the thickness of the frozen wall. The joints of the ground connection wall are f...