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ACI Specificati Requirement Specificat The Service Availabili OntoAgent A platform f Codes for Calculation CVS Roadway and A CVS Underground G CVS Site Preparat CVS Topographic a CVS Geotechnical ACI Ulrich, Jr. Chairman Hugh S. Lacy Secretary Clyde N. Baker, Jr. Prabodh V. Banavalkar Joseph A.
Bohinsky M. Davisson Ronald W. Harris Shraddhakar Harsh Edward S. Hoffman Javier F. Horvilleur Rodrigo Salgado Harold R. Sandberg John F. Seidensticker Bryan P. Sweeney Dan R. Stoppenhagen Samuel S.
White This specification covers requirements for drilled pier construction. It includes delivery, handling, and storage of the casing, excavation, soil testing, placing of concrete and reinforcing steel, and inspection. Drilled piers are sometimes called drilled shafts, caissons, or bored piles. Keywords: bored pile; caisson; concrete; drilled pier; foundation; placing; reinforced concrete; reinforcement; slurry; soil; specification; test; tolerance. This foreword is included for explanatory purposes only.
It does not form a part of Specification ACI Individual sections, articles, or paragraphs shall not be copied into the Project Specifications, because taking them out of context may change their meanings. If sections or parts of ACI Specification A statement such as the following will serve to make ACI Specification Responsibilities for project participants must be defined in the project specifications. ACI Specification Each technical section of ACI Specification The language is imperative and terse.
Checklists are to assist the specifier in properly choosing and specifying any necessary requirements for the Project Specifications. Copyright , American Concrete Institute. All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.
Methods that are not compatible with the design intent will be rejected. In case of conflicting requirements, the Contract Documents shall govern. Anchorage embedment—Embedment of the anchorage system, such as anchor bolts or threaded rods, used to fasten structural components to the piers. Bearing stratum—The soil or rock stratum that carries the load transferred to it by a drilled pier. Bell—An enlargement at the bottom of the pier for the purpose of spreading the load over a larger area.
Casing—A permanent or temporary steel cylinder used to resist earth and water pressures, to serve as a concrete form, and to protect personnel. Contractor—The person, firm, or corporation with whom the Owner enters into an agreement for construction of the Work. Controlled slurry—Slurry that is controlled to conform to specified properties. Cut-off—The top of a pier, a level surface at the elevation shown on the Contract Drawings.
Drilled pier—A foundation element, with or without an enlarged bearing area, extended downward by drilling through earth materials, water, or both, to an acceptable design depth and filled with structural concrete. Dry method—Method of pier installation in which concrete is placed in the dry and where casing may be used to maintain sidewall stability. End bearing—Where load is supported at the bottom of the pier. Liner—A cylindrical form of pier design diameter having the tensile strength to withstand internal concrete pressures and not designed for external earth and water pressures; used inside an oversized temporary casing to prevent possible concrete contamination when temporary casing is removed.
Owner—Corporation, association, partnership, individual, public body, or authority with whom the Contractor enters into agreement and for whom the Work is provided.
Pig—Device inserted into a tremie or pump pipe to separate the concrete from the pier excavation fluid inside the pipe. Probe hole—A 1. The geotechnical engineer feels the probe hole wall by lowering and raising a hooked rod. The size and amount of seams found enables the determination of the soundness of the soil formation. Project Drawings—The drawings that, along with Project Specifications, complete the descriptive information for constructing the Work required or referred to in the Contract Documents.
Project Specifications—The written documents that specify requirements for a project in accordance with the service parameters and other specific criteria established by the Owner. Reference Specification—A specification that, by citing in the Contract Documents, becomes a reference standard for the Contractor to use in the construction of a project together with other project requirements. Side-resistance—Friction developed along the side of a drilled pier that transmits vertical forces to the surrounding soil or rock.
Slurry displacement method—Method of drilling, concreting, or drilling and concreting in which controlled slurry consisting of water, with or without additives such as bentonite, attapulgite, or polymer, is used to stabilize the hole; the slurry may be used to maintain the stability of the uncased drilled pier hole to allow concrete placement when water seepage into a drilled pier hole is too severe to permit concreting in the dry, or both.
Tremie method—Procedure for placing concrete underwater or slurry using a watertight steel pipe or tube to place concrete without washing out cement fines. Work—The entire construction or separately identifiable parts thereof that are required to be furnished under the Contract Documents.
Work is the result of performing services, furnishing labor, and furnishing and incorporating materials and equipment into the construction in accordance with the Contract Documents. Box Farmington Hills, Mich. Ervay, Suite Dallas, Tex. SI units given in parenthesis are for informational purposes only.
Determine if there are conflicts with the Work. Cease work in this area until the conflicts are resolved. Provide site supervisor and drillers, each with a minimum of 3 years of acceptable experience in installing similar types of drilled piers. If an installation method is specified, experience with this method is required; b. Provide the Testing Agency the means and opportunity to take samples and make tests; d.
Submit a program to the Owner for quality control; e. Submit a detailed description of field procedures for pier construction, whether a wet or dry method is to be used, including procedures for excavation, dewatering, slurry type, and source and casing withdrawal, if applicable; and f.
Shop drawings and mill test reports on reinforcing steel shall be submitted. Welding procedures shall be submitted, if applicable. Concrete materials and mixture proportion information shall be submitted in accordance with ACI Concrete for use in the slurry displacement method Section 3.
The mixture shall consist of a mini- Table 2. If the as-installed shaft is larger than specified, the center of the shaft may be taken as the center of a circle having the specified area that lies within the as-installed shaft. If the cross-sectional area of the as-installed shaft is larger than specified at both cut-off and bottom, the out-of-plumbness shall be measured by: a.
The center at cut-off shall be the center as permitted in Section 3. The center at the bottom shall be determined in the same manner as for the center at cut-off. No end bearing 2. With end bearing b.
Polymer slurry 1. With end bearing 2. Polymer slurry 3. Sand content in slurry, immediately before concreting, 1 ft. No end bearing b. No end bearing 4. During hand belling or other operations necessitating entry into the shaft, provide gas-testing equipment and a protective cage, or temporary casing of proper diameter, length, and thickness, plus other safety equipment called for by federal, state, and local laws for inspection and testing of drilled piers and protection of workers.
If the bottom is sloping rock, excavate to either a level plane see 3. Provide the socket roughness specified. If an inner permanent liner is used to permit casing withdrawal, it shall have the strength and rigidity to contain the concrete during placement.
336.1-01: Specification for the Construction of Drilled Piers