Freezing process water stopping device of pre-buried freezing pipe at opening of wall body of underground continuous wall

Abstract

The invention discloses a freezing process water stopping device of a pre-buried freezing pipe at an opening of a wall body of an underground continuous wall. The freezing process water stopping device comprises the freezing pipe, a liquid supply pipe and a liquid drainage pipe, wherein the freezing pipe is in an annular structure with a gap, one end with the gap of the freezing pipe is connected with the liquid supply pipe, and the other end of the freezing pipe is connected with the liquid drainage pipe. The freezing pipe is pre-buried on one side which is close to a soil body in the underground continuous wall, and one ring or multiple rings can be arranged according to the actual needs. The liquid supply pipe and the liquid drainage pipe are led to the outside of the underground continuous wall from the appropriate parts so as to connect with an external freezing system. When the breaking and removing of the wall body or the excavation of the soil body is performed at the opening of the wall body of the underground continuous wall, the surface of the underground continuous wall, which is in contact with a reinforcing body is in frozen state through the pre-circulation of a cooling medium in the pre-buried freezing pipe, thereby enabling the reinforcing body to be well jointed with the underground continuous wall, and avoiding the situation that the breaking and removing of the wall body or the excavation of the soil body can not be completed normally due to water leakage of a water permeable channel formed between the reinforcing body and the underground continuous wall.

Description

technical field [0001] The invention belongs to the field of underground engineering, and relates to a freezing-method water-stopping device, in particular to a freezing-method water-stopping device for a pre-buried freezing pipe used to stop water at an opening of an underground diaphragm wall. Background technique [0002] When it is necessary to break part of the underground diaphragm wall for soil excavation (such as shield tunneling, pipe jacking origination and reception), the soil outside the opening of the underground diaphragm wall must be reinforced to avoid soil excavation outside the wall. Body and groundwater will flood into the working well causing the surface to sink and endangering underground pipelines and nearby buildings. [0003] In areas that are not suitable for precipitation, the commonly used soil reinforcement methods for excavating the opening of the underground diaphragm wall are the "stirring + rotary spraying" method, grouting method, and freezin...

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Problems solved by technology

[0004] 1. Use the "stirring + rotary spraying" method, grouting method (such as figure 1 When the soil is reinforced, it is difficult to ensure that the reinforced body 11 and the underground diaphragm wall 12 are closely fitted at the hole 13, and water-permeable channels are easily generated, and water leakage is prone to occur in the process of breaking the wall, resulting in soil cracking. Digging cannot be completed normally

[0005] 2. When using the vertical freezing method (such as figure 2 (shown) when carrying out soil reinforcement, due to the deflection of the frozen pipe 24 borehole or the heat exchange between the underground diaphragm wall 22 and the outside world, the contact surface of the diaphragm wall 22 and the reinforcement body 21 at the hole 23 may form a water-permeable channel, resulting in soil Body excavation cannot be completed normally

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