A plugging method for basement pit well cushion under water pressure seepage condition

Abstract

The invention discloses a method for plugging leakage of a cushion layer in a basement pit under the condition of water pressure infiltration, which comprises the following steps: cleaning the surface of the cushion layer in the basement pit or the basement well; pouring early-strength impervious concrete on the surface of the cushion layer, After solidification, an anti-seepage layer is formed; holes are drilled at the seepage holes of the anti-seepage layer, and grouting is performed in the drilled holes for sealing. Beneficial effects of the present invention: can significantly reduce the use of water-stop needles and chemical grouting agents, which is suitable for grouting plugging of basement pit well cushions under the condition of poor underground dewatering or no dewatering conditions. The anti-seepage concrete forms a new channel under the self-pressure of groundwater, and then places the water-stop needle through the drill hole to complete the grouting at a low cost, which can make the basement pit well cushion have a good water-stop effect.

Description

technical field [0001] The invention relates to the technical field of cushion plugging, in particular to a method for plugging a cushion in a basement well under the condition of water pressure infiltration. Background technique [0002] Chemical grouting is widely used in waterproofing and plugging of pits and wells in basements. However, under the condition of pressurized groundwater, the effect of waterproofing and plugging is not good after the formation of trachoma in the cast-in-place cushion. There are many water seepage channels and holes formed in the cushion, which makes it impossible to drill and grout all the fine water seepage holes. Even if the grout is injected through the grouting machine after drilling, most of the chemical grout will flow into the ground and the desired stop cannot be achieved. water effect. [0003] In addition, when plugging by using "Dialoling", because there are many sand holes in the basement well and there is a large water head, the...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned technical problems in the related art, the present invention proposes a plugging method for the basement pit well cushion under the condition of water pressure infiltration, which solves the problem of cushion leakage under the action of the pressurized groundwater head after the basement pit well cushion is poured , The plugging effect of chemical grouting through drilling is not ideal, and the direct use of "plugging spirit" to plug the water seepage trachoma on the surface is not ideal

Images