Dynamic hole cleaning method for ultra-deep impermeable wall

Abstract

The invention discloses a dynamic hole cleaning method for an ultra-deep impermeable wall. The method includes the steps that after construction of a trench hole of the ultra-deep impermeable wall iscompleted, the trench hole is cleaned, and a plurality of embedded pipes, a joint pipe and a plurality of pouring conduits are lowered into the trench hole; air pipes for applying air force to the trench hole to be poured with concrete are lowered between the adjacent pouring conduits; and the concrete is poured into the trench hole through the pouring conduits, continuous lifting slurry discharging is carried out on the trench hole poured with the concrete by utilizing the air force applied by the air pipes to synchronously discharge slurry-mixed floccules formed by the upper layer of the concrete in the trench hole and slurry, and then the vertically continuous ultra-deep impermeable wall is formed by the continuously poured concrete. By means of the method, impermeable wall constructioncan be carried out on a river dike with the largest depth exceeding 180 meters, the slurry-mixed floccules and waste residues at the hole bottom are thoroughly removed during impermeable wall construction, the hole cleaning effect is guaranteed, the situation of pipe blockage is avoided, concrete pouring can be continuously carried out, and the phenomenon that the impermeable wall breaks due to cementation and hardening of the slurry-mixed floccules will not occur.

Description

Technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a dynamic hole cleaning method for an ultra-deep cut-off wall. Background technique [0002] With the gradual expansion of the scale of water conservancy projects, the overall anti-seepage effect of the dam is required to be improved simultaneously, resulting in the continuous deepening of the depth of the cut-off wall. The impervious wall mainly includes groove formation, hole cleaning, down-conduit, joint pipe pulling, and pouring. The general engineering only pays attention to the two key processes of groove formation and pouring, while ignoring the hole cleaning process. In fact, hole cleaning is also an important part of the cut-off wall. The quality of the hole cleaning directly affects the quality of the cut-off wall. [0003] The purpose of hole cleaning is to make the density, viscosity, sand content and other indicators of the hole bottom mud meet t...

AI Technical Summary

Problems solved by technology

[0004] However, for projects with sand and pebble formations, depths exceeding 100m, or even cut-off walls with a maximum depth of 150 meters or even 180 meters (180 meters means greater than 180 meters), the slots are deep, the bottom of the hole is more sedimented, and it is difficult to clean the hole. , the equipment is extremely demanding, and the suction power cannot be easily increased, otherwise it will pose a threat to the stability of the slot wall

At the same time, the time for installing the pre-embedded pipes and conduits for grouting is greatly prolonged, and the pre-embedded pipes or positioning frames are prone to disturb the walls of the slot holes during the installation process, resulting in the increase of mud skins and large pieces of mud and slag at the bottom of the hole. If the waste slag is not cleaned, the concrete pouring cannot be carried out smoothly, so that the pouring of the deep groove section cannot be carried out continuously, and the phenomenon of pipe blockage will occur, which will greatly affect the quality of the concrete wall

In addition, because the slot is too deep, the overall pouring time is long, and the concrete contact surface is easy to form agglomeration of concrete and mud precipitation, which increases the difficulty of concrete pouring, makes the strength of the impervious wall unqualified, and collapse accidents are prone to occur

So far, there is no effective solution to the construction of the above-mentioned cutoff wall in the art

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