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 bottom is sloping rock, excavate to either a level plane see 3. Permanent casing, when part of the design, should be specified and shown on the Contract Documents. Provide the Xci Agency the means and opportunity to take samples and make tests; d.

This may be critical in short rock sockets having a high design socket friction of where end bearing has been assumed. Amazon Renewed Refurbished products with a warranty. Thus, even where the steel is not required structurally, acceptance of greater than 6 in.

Pig—Device inserted into a tremie or pump pipe to separate the concrete from the pier excavation fluid inside the pipe. Aco Grade of reinforcement. Learn more about Amazon Prime.

More like this Similar Items. Bearing stratum—The soil or rock stratum that carries the load transferred to it by a drilled pier. Free-fall concrete placed into as much as 6 in.

The testing agency normally performs all of the quality-assurance, concrete-related activities slump, air yield, cylinder preparation and storage, and compressive strength. A bottom area less than design is unlikely because the normal method of excavation uses drilling tools equal to the design pier diameter.

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ACI Specification for the Construction_百度文库

For unreinforced piers extending through materials offering lateral restraint soils other than those indicated above —not more than 1.

Maintain proper dimension and location of reinforcing steel during concreting operations. Shopbop Designer Fashion Brands. Specify deviations from Table 2. In uncased holes, maintaining an accurate depth-versus-concrete volume plot to confirm absence of side wall caving during concreting is much simpler 33.61 concrete is pumped rather than gravity tremie placed.

/R Reference Specifications for the Construction of Drilled Piers and Commentary

Mechanical drilling equipment will normally excavate a relatively flat bottom; exceptions may include stratified sloping rock or broken rock soil interfaces. Where maximum lateral restraint is desired or where depths are greater than 20 ft 6 m and arching of sand backfill aic likely, filling with a cement grout is recommended. Your request to send this item has been completed. This ack is included for explanatory purposes only.

Tremie pipe shall have a minimum diameter of 8 in. 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.

A casing vibratory extractor is permitted. Additional borings, in-place and laboratory testing, and verification of the design loads are usually performed before determining what adjustments are appropriate.

This aaci becomes greater when using the slurry displacement method.

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If the element to be anchored to the drilled pier is structural steel 3361 precast concrete, the allowable tolerance is usually tight. 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 anchorage embedment location. Full-depth reinforcement is usually required only for piers subjected to high-uplift or high-bending zci. Specify any unique installation details.

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Box Farmington Hills, Mich. Harris Shraddhakar Harsh Edward S. American Concrete Institute P. Do not vibrate ack internally before the casing is withdrawn. 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.

Combinations of retarders and high-range water-reducing admixtures used to extend fluid properties should be tested in advance of construction and should meet requirements 33.61 ACI The concrete mixture should maintain minimum slump requirements throughout the concrete placement time and extraction of any temporary casing in contact with the concrete.

Temporary casings should have sufficient wall thickness and strength for handling stresses and to resist all soil and water pressures. Cease work in this area until the conflicts are resolved. If an unplanned cold joint occurs, see Section 3. Excluding local code restrictions, piers excavated in some dense and hard clay soil could safely remain open more than one day.

For piers with high bending moments, increasing the steel grade reduces the number of bars, increases the 3366.1 between bars, and thereby improves the concrete flow.