Grout stop pad construction method for kilometer vertical shaft grouting for water control

Abstract

The invention discloses a construction method for pouring a round-table-shaped grout stop pad in kilometer vertical shaft grouting water-control construction process, comprising the following steps: shaft pouring water treatment, building a water filtering layer, installing a water collecting well and a waterproof layer, installing and fixing a grouting guiding pipe, and pouring a concrete grouting pad, wherein in the step of shaft pouring water treatment, grouting is carried out behind the wall; for the step of installing the water collecting well and the water filtering layer, a space with certain volume is preserved at the medium and upper part of the water filtering layer for installation of a bottomless water-filtering wood tank, then, the steps of paving felt, pouring cement mortar and building a layer of bricks are carried out at the upper part of the water filtering layer from bottom to top in sequence; and in the construction of pouring the concrete grouting pad, the grouting pad and the well wall are tightly fitted through pouring. In the whole construction process disclosed by the invention, the bearing capability of the well wall is fully utilized to confine an aquifer so as to ensure that grout is poured into fractures of the aquifer by using maximum grouting pressure, thus the grouting water-plugging effect under high water pressure and high grouting pressure is ensured in a kilometer vertical shaft construction process, the thickness of the grouting pad is reduced to the maximal extent, and the grouting construction speed is increased.

Description

Technical field: [0001] The invention relates to a construction method of a grout stop pad, in particular to a construction method of a grout stop pad in the process of grouting and water blocking in a vertical shaft with a depth of 1,000 meters, and belongs to the technical field of mine construction engineering. Background technique: [0002] With the increasing scarcity of medium and shallow coal resources and the rapid development of coal mining technology, kilometer-deep vertical shaft projects emerge in endlessly, and deep vertical shafts often pass through aquifers during the excavation process. Under the condition of high pressure, the grout stop pad during the grouting process needs to have sufficient bearing capacity to ensure that the grout can be injected into the fractures of the aquifer with the maximum grouting pressure. Therefore, in shaft construction, how to ensure that the grout stop pad has sufficient bearing capacity, and under this premise, minimize the...

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Problems solved by technology

[0004] The construction methods of the grout stop pads introduced in the above-mentioned documents are simply designed according to the empirical formula of the grout stop pads, and the technical measures adopted are not perfect enough to be targeted in the whole process of the grout stop pad construction. Comprehensive and effective measures are taken to ensure the grouting effect. Although the grout stop pad is constructed, there are still potential safety hazards of wellbore collapse caused by grouting failure.

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