This Reference Specification covers requirements for drilled pier construction and applies to drilled piers of 30 in. ( mm) diameter and larger. The Contractor. ACI – Specifications for the Construction of Drilled Piers – Download as PDF File .pdf), Text File .txt) or read online. ACI Reference Specification for the Construction of Drilled Piers. standard by American Concrete Institute, 01/01/ View all.
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For unreinforced piers extending through materials offering lateral restraint soils other than those indicated above —not more than 1. No end bearing b. Some field conditions, however, such as nearby existing structures, require special treatment.
When the Inspecting Geotechnical Engineer is not the Design Geotechnical Engineer, the Inspecting Geotechnical Engineer will have the responsibilities and authority of the Design Geotechnical Engineer and should be knowledgeable of and in agreement with the design assumptions.
Clear all obstructions encountered during excavation. Work—The entire construction or separately identifiable parts thereof that are required to be furnished under the Wci Documents.
Your request to send this item has been completed. American Concrete Institute P. In uncased holes, maintaining an accurate depth-versus-concrete volume plot to confirm absence of side wall caving during concreting is much simpler if concrete is pumped rather than gravity tremie placed. Concrete for use in the slurry displacement method Section 3.
It included delivery, handling and storage of the casing, excavation, soil testing, placing of concrete and reinforcing steel and inspection. Please select Ok if you would like to proceed with this request anyway. If an unplanned cold joint occurs, see Section 3.
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Use of temporary casing should be consistent with slump requirements minimum slump of 6 in. Drilled pier concrete characteristics are vital for successful pier installation and cai different from those needed to build above-ground structures.
Bearing areas measured to be slightly smaller than design, however, may be acceptable to the Geotechnical Engineer if the actual bearing capacity exceeds that called for in the design. The Geotechnical 36.1 and testing agency may be the same organization or may be different entities. In this case, close cooperation between the Contractor and the testing agency is essential. To ensure complete filling, the grout should be pumped through a pipe extending to the bottom of the annular void space.
See Optional Checklist 3. For side-resistance piers, the level of bearing stratum and material type are confirmed by observation of soil or rock from cuttings and rate of penetration. If movements greater than 6 sci.
/R Reference Specifications for the Construction of Drilled Piers and Commentary
Permanent liners used as a concrete form inside a smooth-walled steel temporary casing are usually thin-walled corrugated metal of sufficient thickness to handle the tensile forces created by the pressure of fluid concrete. Please choose whether or not you want other users to be able to see on your profile that this library is a favorite of yours.
Compensation for changing the size of the bell, if required, can be based on an add or deduct price for the bell volume difference. Recommended references The documents of the various standards-producing organizations and publications referred to in the Checklists to Specification ACI This risk becomes greater when using the slurry displacement method. An annular void space requires filling in two cases.
Place concrete within the time limit during which the excavation remains clean and stable and the concrete maintains the required slump. For example, if the steel movement occurred as the temporary casing was being withdrawn, it may be a sign that the concrete is binding to the casing and arching concrete between the reinforcing cage and across the casing.
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In some soil formations with a very high silt content and a high water table, it may be necessary to increase the allowable maximum slurry density or slurry viscosity to prevent cave-ins. The decision as to which person is acting on behalf of the owner at a specific time or under a specific circumstance rests with the Owner and should be established in the Contract Documents.
The Testing Agency will perform a compression test on cylinders at 28 days. Casing—A permanent or temporary steel cylinder used to resist earth and water pressures, to serve as a concrete form, and to protect personnel. Grout specified to have a minimum day strength of psi kPa is adequate for void filling. The Design Structural Engineer and the Design Geotechnical Engineer should be retained for construction inspection and 3366.1 engineering because design decisions will be required during construction of the foundations.
It does not form a part of Specification ACI The Contractor shall cooperate with the testing agency in the field testing and storage of 3361. specimens, and shall perform testing for quality control or to supplement the testing agency testing, or accept the furnished testing agency testing. The role of quality assurance is to reduce the probability of defects in the drilled piers.
Excluding local code restrictions, piers excavated in some dense and hard clay soil could safely remain open more than one day. Find a copy in the library Finding libraries that hold this item 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.
Due to the crowded conditions, it is often advisable during placement of the drilled-pier concrete to stop the concrete in the pier below the 3366.1 embedment location. If the element to be anchored to the drilled pier is structural steel or precast concrete, the allowable tolerance is usually tight.
Thus, free-fall limits may be desirable in small diameter shafts deeper than 60 ft 18 m. For very large piers, that is, over 50 yd3, consider sampling and testing one set of cylinders axi every 50 yd3. Make diameter of excavation such that the void space outside any temporary casing is minimized.
The Design Geotechnical Engineer, in consultation with the Design Structural Engineer, should recommend the minimum grout properties. If you are a seller for this product, would you like to suggest updates through seller support? Do not vibrate concrete internally before the casing is withdrawn. Lacy Secretary Clyde N.