Session Start Date

6-1-1988

Abstract

Five floors were added to a six storey building during its construction without carrying out necessary structural calculations. When such calculations were later performed they revealed that both the spread footing foundation and many columns were unsafe. The contact pressure beneath footings exceeded the allowable soil pressure. The repair method described in this paper depended on disregarding the spread footing foundation and constructing a new deep foundation system for the existing building. This consisted of end bearing bored piles drilled and cast in the voids between the footings using a special low rise rig. The piles were connected to a rigid reinforced concrete raft located above the footings. The raft in turn was connected to the ground floor columns by means of reinforced concrete jackets. Unsafe columns were repaired using reinforced concrete jackets. Settlement observations were carried out for a sufficient period of time after repair with additionally applied test loads which showed satisfactory results.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Repair and Rehabilitation of a Residential Building at Nile River in Cairo

Five floors were added to a six storey building during its construction without carrying out necessary structural calculations. When such calculations were later performed they revealed that both the spread footing foundation and many columns were unsafe. The contact pressure beneath footings exceeded the allowable soil pressure. The repair method described in this paper depended on disregarding the spread footing foundation and constructing a new deep foundation system for the existing building. This consisted of end bearing bored piles drilled and cast in the voids between the footings using a special low rise rig. The piles were connected to a rigid reinforced concrete raft located above the footings. The raft in turn was connected to the ground floor columns by means of reinforced concrete jackets. Unsafe columns were repaired using reinforced concrete jackets. Settlement observations were carried out for a sufficient period of time after repair with additionally applied test loads which showed satisfactory results.