A follow-up high-efficiency water-stopping and sand-blocking precipitation composite system and its construction method

Abstract

The invention relates to a follow-up type high-efficiency water-stop and sand-hindrance precipitation complex system and its construction method. The system is suitable for all unconfined aquifers andconfined aquifers. The complex system includes a precipitation well, an infiltration-filtration device arranged in a well pipe of the precipitation well, a sand filter layer which the outside of thewell pips is filled, a follow-up type moving water-stop heavy curtain, a waterway-drain seepage well and a settlement observation point; the precipitation well is arranged in an annular mode along theedge of a foundation pit, and the infiltration-filtration device is composed of plum-blossom shaped distribution holes and steel wire gauzes with which the outsides of the plum-blossom shaped distribution holes are coated; the follow-up type moving water-stop and sand-hindrance heavy curtain is placed on the inner side of the precipitation well in an annular mode; the waterway-drain seepage wellis formed on the inner side of the heavy curtain, and the settlement observation point is arranged on the edge of the foundation pit. According to the system and the construction method, foundation-pit precipitation, infiltration-filtration water collection, underground water stop, grit eroding and pipe gush prevention, and settlement prevention and control technology are integrated into a whole system, the structure is flexible, precipitation is high in efficiency, the collaborative linkage property is good, the building cost of projects is low, the application range is wide, and surface subsidence and other engineering hazards caused by grit eroding and pipe gush can be effectively prevented.

Description

technical field [0001] The invention belongs to the field of foundation pit dewatering, and in particular relates to a follow-up high-efficiency water-stopping and sand-blocking dewatering composite system and a construction method thereof. Background technique [0002] With the rapid development of my country's urban infrastructure construction, the scale of buildings (structures) is becoming larger and larger, especially the construction safety of ultra-deep foundation pits in engineering construction has generally been paid attention to. Existing engineering construction data show that large-scale, large-scale, and long-term precipitation is required for ultra-deep foundation pits. However, the implementation of this precipitation project will cause serious harm to the surrounding geological environment. Therefore, how to improve the dewatering efficiency of ultra-deep foundation pits, effectively implement settlement prevention and control, ensure the safety of the ultra...

AI Technical Summary

Problems solved by technology

[0008] Most of the above technologies are a single system, and have not formed a complete composite system

In addition, in the above-mentioned technologies, the volume of the water-stop curtain is large, and the buried depth of the water-stop curtain is fixed, and the buried depth of the ground cannot be flexibly adjusted according to the amount of precipitation, which increases the difficulty of construction and the amount of engineering implementation.

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