A water-stopping method and device for pipe-jacking entry and exit holes suitable for areas with deep, thick, water-rich sand layers

Abstract

The invention provides a water stopping method and device suitable for hole entering and exiting of a jacking pipe in a deep and thick water-rich sand layer area. The water stopping device comprises afirst water stopping ring mounted at a working well reserved hole, a concrete seat built at the working well reserved hole, a second water stopping ring mounted at the reserved hole of the concrete seat, and a jacking pipe tool head matched with the working well reserved hole. A water swelling material is wound on the surface of the jacking pipe tool head. According to the water stopping method and device used for hole entering and exiting of the jacking pipe and suitable for the deep and thick water-rich sand layer area, multiple water stopping protection is provided for hole entering and exiting of the jacking pipe, on the one hand, the pressure borne by a working well can be dispersed, the effect of working well reinforcing is achieved, the gap existing between the jacking pipe tool head and a pipe joint can be blocked by the jacking pipe tool head wound with the water swelling material when the jacking pipe enters the hole, and thus the gap is effectively prevented from leaking water and sand; and on the other hand, the seepage paths of underground water flows can be additionally arranged, the phenomenon that the large amount of water and sand are burst at the hole is relieved, and ground collapse is prevented.

Description

technical field [0001] The invention relates to a water-stopping method and device for pipe-jacking entry and exit holes suitable for areas with deep water-rich sand layers, and can be applied to fields such as electric power engineering, municipal engineering, water conservancy engineering, and traffic engineering. Background technique [0002] When the pipe jacking passes through the deep water-rich sand layer area, the requirements for the end reinforcement and water stop are very strict. It is necessary to ensure that the soil has a certain bearing capacity and the water stop effect. construction safety. Existing pipe-jacking well piercing hole water-stop devices generally adopt jet grouting piles, mixing piles, sleeve valve pipes and plain concrete wall water-stop curtain walls to be reinforced within a certain range around the hole, and detachable water-stop steel is installed at the hole position. Then install the water-stop rubber ring on the steel ring to achieve t...

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Problems solved by technology

However, this method belongs to the remedial operation, that is, the subsequent remedial construction can only be carried out after the work of the pipe jacking tool head is completed. Timely filling of the gaps generated between the gaps, groundwater and sand are still very easy to seep out of the gaps, causing ground subsidence in severe cases

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