A waterproof construction technology for deep hole grouting filling treatment

By using groundwater with poor permeability in the grouting construction to isolate the shallow strong permeability layer of groundwater in the grouting construction, the problems of water level reduction and pressure water overflow during grouting construction are solved, and the construction quality and cost reduction are achieved.

CN119163050BActive Publication Date: 2025-03-18SICHUAN INSITITUTE OF BUILDING RES +1
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Patent Information

Application Number
CN202411659926.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-20
Publication Date
2025-03-18
Estimated Expiration
2044-11-20

AI Technical Summary

Technical Problem

During grouting construction, groundwater in shallow strong permeability layer will lead to a decrease in water level and sudden changes in hydrogeological conditions, and deep pressure groundwater may overflow the surface, affecting the construction site.

Method used

The water-blocking construction process of deep hole grouting filling treatment is adopted. By applying a replacement cylinder with poor permeability at the intended grouting point, it is embedded in a deep weak permeability formation, forming holes inside the replacement cylinder for grouting filling treatment.

Benefits of technology

It effectively isolates groundwater from the shallow strong permeability layer, avoids the reduction of water level and sudden changes in hydrogeological conditions, and prevents the overflow of deep pressure-bearing water, reduces the cost of grouting materials, and improves the construction quality.

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Abstract

The present invention discloses a waterproofing construction process for deep hole grouting filling treatment, which relates to groundwater control engineering in the process of foundation treatment, and comprises the following steps: (1) testing the static water level elevation of the submerged water in the shallow strong permeable layer, or testing the water level elevation of the confined water rich in the hole or broken zone in the deep weak permeable layer; (2) determining the top surface elevation of the weak permeable layer at the proposed grouting point; (3) determining the permeability coefficient to be used for the replacement cylinder; (4) calculating and determining the minimum radius of the replacement cylinder according to the hole radius when installing the grouting pipe during the grouting construction; (5) applying a replacement zone with poor permeability at the proposed gradual point; (6) implanting the replacement cylinder into the replacement zone; (7) drilling a hole in the center of the replacement cylinder to the depth of the hole or broken zone, and installing a grouting pipe in the replacement cylinder after drilling, and filling the grouting pipe with grouting. The present invention can not only solve the problems caused by the conventional grouting construction process, but also reduce the construction cost and ensure the quality of grouting construction.
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