Controllable one-well lamina precipitation construction method

Abstract

A architectural engineering area technology controllable a well lamination construction, including: (1) falls water well use two section or more strainer designs, in the diving water-bearing stratum and the bearing pressure water-bearing stratum has the strainer separately; (2) in the well, between the diving water-bearing stratum and in bearing pressure water-bearing stratum's section of well tubes installs stops the water installment controllably; when (3) tenth well constructs, outside between well tube's wall and the opening wall, the diving water-bearing stratum and the bearing pressure water-bearing stratum's aquiclude place establishment stops the water section; when (4) precipitation construction, carries on the diving unwater precipitation first, when in has the dangerous depth which structure excavation to the confined water produces wells up suddenly, opens in the well to stop the water installment, the extraction confined water, and may continue to the diving water-bearing stratum to carry on the unwater precipitation; In the pump process, in the well stops the water installment to open repeatedly and to close, realizes to the precipitation level, the precipitation process, the precipitation degree control. This invention uses a well to solve the diving unwater and the confined water voltage dropping or the unwater question.

Description

technical field [0001] The invention relates to a construction method in the technical field of construction engineering, in particular to a controllable one-well layered dewatering construction method. Background technique [0002] Underground construction in soft soil foundation with high groundwater level, such as foundation pit excavation, the biggest problem in construction is that the existence of groundwater will cause problems such as water gushing and sand gushing in the base. Therefore, the use of well points to artificially lower the groundwater level is a commonly used and effective method in foundation pit excavation construction. The method of foundation pit excavation generally adopts dry excavation, that is, the water in the soil that needs to be excavated is drained first (keep the groundwater level at 0.5-1.0m below the excavation surface), and then the soil is excavated. In addition, when the excavation depth of the foundation pit is relatively large and ...

AI Technical Summary

Problems solved by technology

This method of separately arranging the drainage well and the pressure well has major defects: the two wells need to be formed and operated separately, and the project cost is high; the number of wells in the foundation pit is large, which affects the excavation construction progress, thereby affecting the entire project construction duration

Therefore, the main disadvantage of this method is that, under the condition that the confined aquifer is not completely cut off by the water-proof curtain, if this method is used for dewatering construction, the amount of ground subsidence outside the foundation pit will be larger than that of the previous construction method. This is an important reason why it cannot be promoted and applied

This dewatering method has a large number of wells, a small treatment depth, and high engineering cost. It is only limited to the dewatering reinforcement treatment of soft soil foundations, and is not suitable for foundation pit dewatering.

Images