Strong-water-permeability stratum building foundation pit horizontal grouting sealing bottom construction method

Abstract

The invention discloses a strong-water-permeability stratum building foundation pit horizontal grouting sealing bottom construction method. The strong-water-permeability stratum building foundation pit horizontal grouting sealing bottom construction method includes the following steps that horizontal grouting sealing bottom construction is conducted, wherein precise positioning and horizontal grouting hole drilling are conducted through a horizontal directional drilling machine, and after hole drilling is completed, retreating type grouting is conducted when drill stems are dragged back, and ahorizontal sealing bottom is formed at the bottom of a foundation pit; and vertical curtain construction is conducted, wherein after sealing bottom horizontal grouting is completed, closed vertical curtains are formed on the four sides or the three sides of the foundation pit, complete lap joint connection is conducted on the vertical curtains and the horizontal sealing bottom, and in other words, a strong-water-permeability stratum foundation pit water insulation structure is formed. According to the strong-water-permeability stratum building foundation pit horizontal grouting sealing bottomconstruction method, vertical curtain construction is conducted after horizontal sealing bottom construction is conducted; firstly, the horizontal sealing bottom can be rapidly formed for the foundation pit to control underground water; then, the vertical curtains and the horizontal sealing bottom structure are connected together, and therefore a three-dimensional anti-seepage structure can be formed for the foundation pit project, and the effects of supporting, water insulation and foundation pit project reinforcing are achieved; and while the surrounding environment is well protected, the project cost is saved, and the project risk is lowered.

Description

technical field [0001] The invention belongs to the field of foundation pit construction in strong water-permeable strata in building construction, and in particular relates to a construction method for horizontal bottom sealing and water-stopping of building foundation pits in strong water-permeable stratum. Background technique [0002] In the construction process of foundation pit engineering in highly permeable strata, the impact of groundwater will not only deteriorate the construction conditions, but also cause geological disasters such as slope collapse and surrounding foundation subsidence. Therefore, in the foundation pit project, the transitional extraction of groundwater must be strictly controlled, and the dry construction of the foundation project must be obtained through the water-stop curtain to ensure the stability of the foundation pit support and the bottom plate and the safety of the surrounding environment of the foundation pit. We usually use three metho...

AI Technical Summary

Problems solved by technology

Due to the large amount of seepage and drainage of foundation pits in highly permeable strata and the long construction period of foundation works, the cost of drainage and precipitation in the general method is extremely high, while the water interception curtain is buried deep in the relatively impermeable layer, and the vertical curtain engineering volume is huge, and The impact on the surrounding hydrogeological environment is considerable

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