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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Thus, free-fall limits may be desirable in small diameter shafts deeper than 60 ft 18 m. When a permanent casing is used to carry part of the design load, all joints should have full-penetration welds or a mechanical alternative. Work—The entire construction or separately identifiable parts thereof that are required to be furnished under the Contract Documents. Cut-off—The top of a pier, a level surface at the elevation shown on the Contract Drawings.
The center at the bottom shall be determined in the same manner as for the center at cut-off. Discover Prime Book Box for Kids.
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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. Grout specified to 3366.1 a minimum day strength of psi kPa is adequate for void filling.
Appropriate alternative dispute-resolution procedures are available from the following organizations: Because 3361. 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.
Alexa Actionable Analytics for the Web. These specific circumstances are set forth in this Reference Specification. There may be situations, such as a partial-depth reinforcing, where a tighter tolerance on reinforcing steel should be specified, and situations such as a full-depth reinforcing, where much greater movements can be specified.
In rock, acceptance of the bearing stratum will often depend on a predetermined seam criteria to be used in evaluating probe holes drilled to confirm rock stratum. Make diameter of excavation such that the void space outside any temporary casing is minimized. This specification covers requirements for drilled pier construction. Allow this favorite library to be seen by others Keep this favorite library private.
The concrete supplier provides quality control of the mixture sent to the site, making periodic cylinders for strength testing. The level of grout in the annulus on the side acj the grout discharge point should be monitored to assure uniform void filling.
With regard to the bearing stratum, the type and number of tests performed and any specific acceptance criteria is determined by the Geotechnical Engineer. A casing vibratory extractor is permitted. If sufficiently fluid grout is used, it may be acceptable to place the grout from a concrete truck using a chute and gravity flow.
Probing is desirable when there is a distinct possibility of encountering voids or soft zones below the pier within the zone of significant influence.
Maintain proper dimension and location of reinforcing steel during concreting operations. The E-mail Address es field is required. No end bearing 2. Visit the site; 2. Recent research on free-fall concrete has confirmed that free fall does not cause segregation, at least for fall heights up to 60 ft 18 m and afi diameters as small as 3 ft 1 m with 10 in. Provide site supervisor and drillers, each with a minimum of 3 years of acceptable experience in installing similar types of drilled piers.
Maintain the slurry level above any unstable zones a sufficient distance to prevent caving or sloughing of those zones. Use of temporary casing should be consistent with slump requirements minimum slump of 6 in.
In ai clays and wet silts, the hole stand-up time may only be minutes. In fissured or cavity-prone rock, more than one probe per pier and deeper probes are sometimes required. 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.
The specifier shall make adjustments to the needs of 363.1 particular project by reviewing each of the items in the checklists and including those the specifier selects as mandatory requirements in the Project Specification. For example, if water-soluble sulfate exists in the soil or groundwater at the project site, specify a cement meeting criteria set forth in Table 4. If the socket requires a specific groove width, depth, and spacing, this should be specified.
If there is a possibility of tension, the design and spacing or staggering of splices in the vertical reinforcing should be designed according to ACI Amazon Renewed Refurbished products with a warranty.
R Specification for the Construction of Drilled Piers: ACI: : Books
All aspects of the procedures outlined for withdrawing temporary casing are critically important aic there is the potential acl an excessive water or slurry pressure head outside of the casing. 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.
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 acii the pressure of fluid concrete. Failure to do so is ample cause for disapproval of the subcontractor. In cohesive soils, this typically is a single unconfined compression test performed on a sample taken from the bearing stratum.
The installation and slurry materials shall be in accordance with this Section.