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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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. No simple post-construction method is available to conclusively determine the absence or presence of a pier defect. The purpose of the preconstruction meeting is to establish or confirm lines of communication and roles of the parties involved, review construction procedures and schedule to be followed, and answer any questions that the parties involved might raise.
Many cases of defective drilled piers that have resulted in litigation have occurred because one or more of these specified procedures have not been followed.
/R Reference Specifications for the Construction of Drilled Piers and Commentary
Tremie method—Procedure for placing concrete underwater or slurry using a watertight steel pipe or tube to place concrete without washing out cement fines. Take care to ensure that the pig is properly sized to fit in the pipe, and keep the concrete separate from the slurry so that all slurry is expelled from the pipe during the initial charging process. Side-resistance—Friction developed along the side of a drilled pier that transmits vertical forces to the surrounding soil or rock.
Specify any unique installation details. If the shaft is being constructed under slurry, and the size and depth of the shaft combined with local work-hour restrictions prevent completion in one day, however, leaving the uncompleted shaft open but full of slurry should be satisfactory provided the surface opening is adequately covered to meet safety requirements.
The most common alternative dispute-resolution procedures involve mediation, arbitration, or dispute review boards. The seam criteria will vary depending on whether seams are open or filled and on tolerance for foundation settlement. The quality-assurance, soil-related tests primarily strength and penetration are performed by the Geotechnical Engineer.
In the second case, the entire void space can be seen so that a gravity flowable grout can be acceptable, depending on depth and lateral restraint assumptions.
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For side-resistance piers, the level of bearing stratum sci material type are confirmed by observation of soil or rock from cuttings and rate of penetration. Find a copy in the library Finding libraries that hold this item Citations are based on reference standards. Place concrete within the time limit during which the excavation remains clean and stable qci the concrete maintains the required slump. A bottom area less than design is unlikely because the normal method of excavation uses drilling 336.
equal to the design pier diameter. Up to 2 in. The size and amount of seams found enables the determination of the soundness of the soil formation. Ervay, Suite Dallas, Tex. Linked Data More info about Linked Data. However, formatting rules can vary widely between applications and fields of interest or study. I’d like to read this book on Kindle Don’t have a Kindle? In case of conflicting requirements, the Contract Documents shall govern. Acceptance acu the drilled pier bearing stratum and drilled pier as-built installation is usually done by the Geotechnical Engineer.
Box Farmington Hills, Mich. If you are a seller for this product, would you like to suggest updates through seller support? Slurry displacement method—Method of drilling, concreting, or drilling and concreting in which controlled slurry consisting of water, with or without additives such 3336.1 bentonite, attapulgite, or polymer, is used to stabilize the hole; the slurry may be axi 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.
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R Specification for the Construction of Drilled Piers: ACI: : Books
In such cases, a much stricter bottom clean-out is required to minimize concrete contamination and potentially significant defects in the concrete. If the anchorage components are not easily pushed into the fresh concrete, the concrete shall be vibrated to ensure full contact between anchorages and concrete. Your list has reached the maximum number of items. In some cases, concrete samples have been taken from every truck but tested only if required.
This foreword is included for explanatory purposes only. In soft clays and wet silts, the hole stand-up time may only be minutes.
Cancel Forgot your password? Where drilled piers are installed below groundwater or in caving soils, maintain the slurry level in the 3336.1 not less than 5 ft 1. As a result, the pipe, upon initial discharge, can be closer to the bottom 4 in. When the pipe is filled with concrete, lift the pipe off the bottom the minimum amount needed to start the concrete flowing.