Construction method of interwall grouting waterproofing and strengthening shaft wall structure under the protection of frozen wall

Abstract

The invention provides a construction method for an inter-wall grouting water-resisting and reinforcing well wall structure under protection of a freezing wall, and belongs to construction methods for inter-wall grouting water-resisting and reinforcing well wall structures. The construction method for the inter-wall grouting water-resisting and reinforcing well wall structure under protection of the freezing wall comprises the steps that the grouting opportunity under the protection of the freezing wall is selected actively; a grouting pipe is embedded between an inner wall and an outer wall while the inner well wall is constructed; after construction of the inner well wall is completed and before the freezing wall is melted, grouting is conducted between the inner well wall and the outer well wall from the ground under the protection of the freezing wall; and the space between the inner well wall and the outer well wall is blocked actively, so that the grouting protection effect is improved, the water sealing effect of the outer well wall is sufficiently improved, and the combined bearing effect of the inner well wall and the outer well wall is brought into play. The construction method for the inter-wall grouting water-resisting and reinforcing well wall structure under protection of the freezing wall has the advantages that the grouting pressure is low, and compact grouting is achieved; the airtightness of the outer well wall can be greatly improved after grouting, water pressure does not directly act on the inner well wall after the freezing wall is melted, and thus the stress condition of the inner well wall and the outer well wall is greatly improved; and construction is easy and convenient, the cost performance is high, the water sealing effect is remarkable, and the construction period is shortened.

Description

technical field [0001] The invention relates to a construction method for interwall grouting waterproofing and well wall structure strengthening, in particular to a construction method for interwall grouting waterproofing and well wall structure strengthening under the protection of frozen walls. Background technique [0002] Shaft shafts are the throat of the entire coal mine’s safe production. Freezing method sinking technology has been widely used when passing through deep topsoil layers. The traditional topsoil section shaft wall adopts a double-layer shaft wall structure. The outer shaft wall is poured in sections, and then the inner shaft wall is constructed from bottom to top. Foam boards are laid between the inner and outer shaft walls to overcome the influence of the vertical additional force caused by the formation settlement during the mine's long-term operation on the inner shaft wall. Due to the constraints of construction, low temperature maintenance, water and...

AI Technical Summary

Problems solved by technology

[0003] After the frozen wall melts, the hydraulic connection has filled the pores, and it is subjected to water pressure during grouting, resulting in difficult water plugging during grouting, poor water plugging effect, high economic cost, and long time in the wellbore.

At the same time, the water seepage in the shaft will have a serious impact on the safety of the shaft wall structure itself and the service life of the equipment in the shaft. When the water inflow is too large, it will even affect the safety of the entire mine.

Images