Study On Freezing Construction Effect Of Special-shaped Connecting Passage

In the underground construction of water-bearing weak strata,the freezing method is often used.The main purpose is to reduce the temperature of the freezing liquid by using the cooling effect of the freezer,and transport it to the target area by using the pipeline,thereby improving the stability of the stratum in the area.strength.In the construction of modern urban rail transit tunnels,necessary communication channels are established between the uplink and downlink tunnels.When urban rail transit encounters unexpected situations during its operation,the contact channel can be used for personnel transfer.evacuation.The heterogeneous communication channel studied in this paper is located in the weak water-bearing stratum,and the communication channel is constructed by the freezing method.The freezing method is adopted to realize the safe and rapid construction of the communication channel,which has very important engineering significance in the construction of underground engineering.This paper takes the shield tunnel between Zhongsanyang Station and Hong Kong Road Station of Wuhan Urban Rail Transit Line 7 as the research object,and discusses the construction process of the freezing method by reading relevant engineering materials and literature.The design of the process and its construction principle was carried out.The design of the communication channel,freezing station and freezing hole in the tunnel was carried out.The number of freezing pipes and the arrangement and parameters of the freezing holes were optimized during the tunnel construction.The freezing construction and the melting control were studied.,refrigeration technology and the construction plan of the freezing method.Based on the existing parameters such as curtain thickness and freezing temperature,the surrounding rock freezing and temperature change monitoring of the communication channel are carried out,and the curve of the horizontal direction of the communication channel and the freezing water temperature in the depth direction is obtained.The research result is the construction technology of the freezing method and Engineering practice has application value.Figure [59] table [10] reference [51]...