Construction method of ultra-deep anti-seepage wall

Abstract

The invention discloses a construction method of an ultra-deep anti-seepage wall. The construction method comprises the following steps of in a grooving construction process of the ultra-deep anti-seepage wall, if the anti-seepage wall needs to be embedded into a high and steep bed rock of a riverbed, forming a slotted hole by adopting a composite blasting method; after the slotted hole is formed,pouring concrete into the slotted hole by adopting a dynamic hole cleaning method to prevent the upper layer of the concrete and a mixed slurry flocculate formed by slurry precipitation in the slotted hole from being cemented and hardened so as to continuously pour the concrete to form a continuous wall body in the vertical direction; and when the concrete is poured into the slotted hole, preventing the poured concrete from entering the inner part of a joint pipe to cause the joint pipe to be cast through a valve assembly of the joint pipe arranged at the end of the slotted hole and an adjusting assembly for adjusting the opening degree of the valve assembly. According to the construction method disclosed by the invention, the anti-seepage wall can be constructed in a deep covering layerwith the deepest depth exceeding 180 meters under the condition of bad construction conditions, the construction method is high in grooving efficiency and good in effect, and the construction period of the anti-seepage wall is shortened and the construction quality of the anti-seepage wall is guaranteed.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a construction method for an ultra-deep cut-off wall. Background technique [0002] Concrete anti-seepage walls are a mature technology among various foundation treatment and foundation engineering technologies at home and abroad. In the water conservancy and hydropower industry alone, countless anti-seepage walls have been built. With the changes of the times and the updating of technology, the cut-off wall has undergone earth-shaking changes in terms of construction technology, groove-forming machines and tools, environmental protection requirements, special case handling, etc., in order to meet the construction needs of different cut-off walls. [0003] At present, the use of cut-off walls as an anti-seepage solution in earth-rock dams with good construction environment, unlimited construction time, and a depth of less than 100 meters is in a mature ...

AI Technical Summary

Problems solved by technology

[0003] At present, the use of cut-off walls as an anti-seepage solution in earth-rock dams with good construction environment, unlimited construction time, and a depth of less than 100 meters is in a mature stage. In the construction environment with limited time, if the slope of the bedrock surface on one or both sides of the river bed is greater than 50°, the maximum depth of the anti-seepage wall exceeds 150 meters or even 180 meters, and there may be boulders with high content and serious overhead phenomena In terms of geological conditions where broken zones or faults are often encountered, the construction cannot be carried out smoothly based on past construction experience.

Because, when making holes in the steep slope bedrock, because the drilling tool is easy to slip when it falls and smashes the bedrock, it is very difficult to insert the rock. Unqualified rock seriously affects the quality of the cut-off wall

However, there are many boulders, large particle size, and serious overhead phenomenon, which will greatly affect the construction period and quality of the follow-up cut-off wall construction on this stratum.

If the slot is too deep, it is extremely difficult to pull out the joint pipe, and it is prone to shrinkage and collapse of the joint hole. The current drawing method and equipment cannot meet the requirements. ultra-deep cut-off wall

In summary, so far, there is no effective solution for the above-mentioned anti-seepage wall construction in the art

Images