Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

TOOBA deep excavation project was conducted in a densely developed area in the North West of Tehran, capital of Iran, to provide space for 4 basement levels for multiple buildings around the already functional TOOBA tower. TOOBA tower is located in the northern leg of the excavation boundary in a way that the northern side of the building abuts the excavation edge. Hence, this project involved excavation on 3 sides of the roughly rectangular plan of TOOBA tower to the depth of 16.5 meters below its foundation level. The necessity for constraining the deformations of the tower commended the construction of contiguous bored concrete piles around the building supported at 4 different levels with tieback and wailing system. A monitoring program for measuring the deformations of the tower and supporting system was also enforced during and after excavation. The three-dimensional nature of the retaining structure required careful design and construction procedure to avoid problems such as the intersection of the anchors. Each tieback was given a unique direction which was defined by 3 angles relative to the local x, y and z axes. Therefore, complicated forces were exerted on the wailing system and piles. The excavation procedure was ensued with no excessive deformations occurring in the building during or after the excavation. This paper considers some of the design and construction aspects of this successfully completed project.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Deep Excavation on 3 Sides of a 21 Story Building: Accounts of a Successful Deep Excavation Project

Chicago, Illinois

TOOBA deep excavation project was conducted in a densely developed area in the North West of Tehran, capital of Iran, to provide space for 4 basement levels for multiple buildings around the already functional TOOBA tower. TOOBA tower is located in the northern leg of the excavation boundary in a way that the northern side of the building abuts the excavation edge. Hence, this project involved excavation on 3 sides of the roughly rectangular plan of TOOBA tower to the depth of 16.5 meters below its foundation level. The necessity for constraining the deformations of the tower commended the construction of contiguous bored concrete piles around the building supported at 4 different levels with tieback and wailing system. A monitoring program for measuring the deformations of the tower and supporting system was also enforced during and after excavation. The three-dimensional nature of the retaining structure required careful design and construction procedure to avoid problems such as the intersection of the anchors. Each tieback was given a unique direction which was defined by 3 angles relative to the local x, y and z axes. Therefore, complicated forces were exerted on the wailing system and piles. The excavation procedure was ensued with no excessive deformations occurring in the building during or after the excavation. This paper considers some of the design and construction aspects of this successfully completed project.