Pouring method of concrete foundation in watery soft soil layer electric power foundation pit

Abstract

The invention discloses a pouring method of a concrete foundation in a watery soft soil layer electric power foundation pit. The pouring method comprises the following steps that S1, firstly, a pouring position of the concrete foundation in the foundation pit is marked, and then quartz sand with the thickness of 40 cm is paved above the pouring position; S2, steel pipes are inserted into the position of the concrete foundation; S3, sealing ditches are dug in the periphery of the pouring position, a polyethylene film is laid on the quartz sand in the step 1, the four corners of the polyethylenefilm are placed in the sealing ditches, and clay is used for backfilling and compacting; and S4, vacuum pumping construction is conducted on the interior of the polyethylene film in the step 3 through vacuum equipment. According to the pouring method for the concrete foundation in the watery soft soil layer electric power foundation pit, the stability of the foundation is improved through the steel pipes distributed in the regular hexagon shape, water permeable holes in the surfaces of the steel pipes and the round steel; and meanwhile, concrete grout flows out of the water permeable holes, the contact area and friction force of the concrete grout with the watery soft soil layer are increased after hardening, the stability of the foundation is effectively improved, and the phenomenon of foundation collapse is avoided.

Description

technical field [0001] The invention relates to the technical field of concrete foundation pouring, in particular to a method for pouring concrete foundations in electric power foundation pits with multiple water soft soil layers. Background technique [0002] Watery soft soil is mainly composed of silt deposits with high natural water content, high compressibility, low bearing capacity and a small amount of humus. Soft soil is widely distributed in my country, mainly located in coastal areas, plains, inland lake basins, depressions and rivers The soft soil in the coastal and plain areas on both sides of the strait is mostly located in the deltas or alluvial plains in the lower reaches of the big rivers, such as the Yangtze River and Pearl River deltas, Tanggu, Wenzhou, Minjiang estuary plains and other areas; inland lake basins and depressions are Dongting Lake, Hongze Lake, etc. Lake, Jiuhu, Dianchi and other places are representative; soft soil is often distributed in flood...

AI Technical Summary

Problems solved by technology

[0003] Due to the large natural water content of the soil foundation, high compressibility, poor water permeability, and low shear strength, uneven settlement is likely to occur, and the foundation strength of the soft soil layer with water is low. Once disturbed, the soil structure will be destroyed and the strength will be weakened. Therefore, pouring concrete foundations in foundation pits with rich water and soft soil layers will easily lead to a decrease in the stability of the foundations, and in severe cases, it will cause collapse.

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