Discussion on the anti-floating design of underground constructions;

Design and application of the anti-floating anchor shaft in basement

This paper is to analyze the common technical measures of basement design from the view of construction documents audit,and anti-floating design,air-defense design and the energy conservation design are elaborated in detail.

Combining a practical case,the technique of pressure dispersive anti-float anchor on experiment,design,construction and examination is studied.

The problems how to make theprotecting wall of foundation pit by which there is a building underground pipeline andhow to make water drop on the foundation anti-float in winter constution are solved in practice.

Problems are analyzed such as the subgrade bearing capacity, sedimentations and anti-float.

Introduce the anti-buoyancy design key point for furnace pit structure,mainly discuss the confirmation of waterproof location,water reduction coefficient,sub-coefficient of load of water buoyancy.

On the basis of seriously studying and analyzing the construction design drawings the paper puts forward the approach to the side stability, bottom surge of foundation pit, anti-buoyancy of underground engineering as well as the safety and protective measures of the surrounding ancient buildings etc.

3D Numerical simulation analysis of deep excavation enforced by uplift piles;

Discussion of anti-floating measures thin-wall hollow tube in hollow floorslab of concealed wide-flat beams;