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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Cut-off—The top of a pier, a level surface at the elevation shown on the Contract Drawings. The Geotechnical Engineer and testing agency may be the same organization or may be different entities. Specify any additional required submittals by Contractor and distribution thereof. These requirements can be adjusted as determined by the Geotechnical Engineer, particularly when working 363.1 complex or variable soil formations, deep and large diameter piers, pier construction involving casing withdrawl, or the slurry displacement method.
This can be done based on a unit add and deduct price for above and below adi depth. If this is not possible, redrill, clean, and test the slurry in the excavation before concreting. Would you also like to submit a review for this item?
ACI Specification for the Construction_百度文库
Some features of WorldCat will not be available. The amount of time the concrete remains fluid is especially important for piers installed by the slurry displacement method.
Provide site supervisor and drillers, each with a minimum of 3 years of acceptable experience in installing similar types of drilled piers. Cross-hole sonic logging using preplaced access tubes attached to the reinforcing bar cage offers the most reliable nondestructive indication of defects in the concrete zone between the tubes.
In such cases, a much stricter bottom clean-out is required to minimize concrete contamination and potentially significant defects in the concrete. For very large piers, that is, over 50 yd3, consider sampling and testing one set of cylinders for every 50 yd3. Box Farmington Hills, Mich. Contaminated concrete in rock sockets with high side-resistance values or long side-resistance soil piers can result in relatively high pureshear stress levels in the concrete approaching ultimate shear-strength levels.
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.
Provide the socket roughness specified. The length of time that a pier excavation can safely remain open depends on the soil conditions and local code restrictions. Probing depends on the level of knowledge of the local geology and the extent of the prior subsurface exploration program.
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Please re-enter recipient e-mail address es. Bottom elevation of drilled piers shown on project drawings are taken from the design geotechnical report and are estimated depths for bid purposes. If a tighter tolerance is required particularly with small diameter shaftsit should be specified. Clean, recirculate, remove sand from, or replace the slurry to maintain the required slurry properties. In these cases, additional specified procedures are advisable to minimize the likelihood of undetected defects of significant magnitude.
The seam criteria will vary depending on whether seams are open or filled and on tolerance for foundation settlement. Mechanical drilling equipment will normally excavate a relatively flat bottom; exceptions may include stratified sloping rock or broken rock soil interfaces. You already recently rated this item. No end bearing 4. Because high sand content in the slurry can be the cause of pier defects if the sand settles out of the slurry during concreting, some researchers recommend maintaining the same maximum sand content requirements for both side-resistance and end-bearing designed piers.
Search WorldCat Find items in libraries near you. Responsibilities for project participants must be defined in the project specifications. Whether and what percent of piers need to be probed should be specified.
As a result, the pipe, upon initial discharge, can be closer to the bottom 4 in. 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.
Reference specifications for the construction of drilled piers ACI A casing vibratory extractor is permitted. The ASTM grade of reinforcing steel can affect constructibility. Thus, free-fall limits may be desirable in small diameter shafts deeper than 60 ft 18 m.
The location tolerances given in the Specification are the national consensus standards.
In some piers, the design stresses may be at or close to the allowable code value.