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Top/Down Construction - Use and Construction Sequence

DeepEX software can be used for the design of top/down excavations. This section examines the use of top/down construction method in deep excavation design, as well as, the construction sequence.

Figure: Top/Down Excavation in DeepEX.

Use of Top/Down construction method

Top/down excavation models can be designed in minutes with DeepEX software. Top/down or up/down construction methods are another method for constructing deep excavations. In this case the basement floors are constructed as the excavation progresses. The top/down method has been used for deep excavation projects where tieback installation was not feasible and soil movements had to be minimized. The Post Office Square Garage in Boston (7-levels deep) is one of the best-instrumented and documented top/down projects in the US (Whittle, et al., Whitman et al., 1991).

Top/Down construction sequence

The sequence construction begins with retaining wall installation and then load-bearing elements that will carry the future super-structure. The basement columns (typically steel beams) are constructed before any excavation takes place and rest on the load bearing elements. These load bearing elements are typically concrete barrettes constructed under slurry (or caissons). Then the top floor slab is constructed with at least on construction (glory) hole left open to allow removal of spoil material.

 

SupportSystem3.JPG

Figure: Typical Top/Down Sequence.

The excavation starting at the glory hole begins once the top floor has gained sufficient strength. Soil under the top basement floor is excavated around the basement columns to slightly lower than the first basement floor elevation in order to allow for the installation of the forms for the first level basement slab. Glory holes are left open within each newly formed basement floor slab and the procedure is repeated. Each floor rests on the basement columns that were constructed earlier.

Top/Down Excavation - Diaphragm Walls with Concrete Slabs

Open Example

Top/Down Excavation Example - Diaphragm (slurry) Walls with Slabs

Open Example - English Units Open Example - SI Units
Presentations_DeepEX_TopDown Excavation.png

 

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DeepEX - Shoring Design Software
DeepEX - Shoring Design Software

DeepEX is the ultimate software program for design and analysis of Deep Excavations! Design any wall type and support system in the most efficient way!

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    3D Frame Analysis
 

 

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New Version - DeepEX 2022!

The new version DeepEX 2022 is here! New features and new optional modules including design of Sea Walls, wave pressures and overtopping, design of steel connections for struts and walers and more!

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HoloDeepEX

The brand new DeepEX module is now available! Create Holographic representations of 3D deep excavation models and impress your clients!

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DeepEx
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Main Features of DeepEX

DeepEX is the Ultimate software for design of deep excavations. It incorporates general limit equilibrium methods and non-linear analysis method with use of elastoplastic Wincler springs.

DeepEX does both structural and geotechnical analysis of any deep excavation wall and support system.

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Additional Modules of DeepEX

In DeepEX we have implemented additional optional modules that can make your life easier!

The optional modules can be included in the DeepEX Ultimate and can help you get the most out of your software version!

  • Slope Stability and Soil Nailing (always included in DeepEX Ultimate)
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  • Steel Connections
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  • Sea Walls - Wave Pressures

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Purchase DeepEX - Customize your version

Order now the best, user-friendly software program trusted by more than 1200 Engineers and Companies worldwide!

You can customize your version, adding any of the provided additional modules!

For additional information or to get a special offer, please reach us by:
sales@deepexcavation.com

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DeepEX features and additional modules

DeepEX is the Ultimate software for design of deep excavations. It incorporates general limit equilibrium methods and non-linear analysis method with use of elastoplastic Wincler springs.

DeepEX does both structural and geotechnical analysis of any deep excavation wall and support system.

Additional, optional modules are available and can make your life easier!

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