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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Lacy Secretary Clyde N. 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. 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.
A bottom area less than design is unlikely because the normal method of excavation uses drilling tools equal to the design pier diameter.
For unreinforced piers extending through materials offering minimal or no lateral restraint water, normally consolidated organic soils, and soils that might liquefy during an earthquake — Full-depth reinforcement is usually required only for piers subjected to high-uplift or high-bending moments.
WorldCat is the world’s largest library catalog, helping you find library materials online. For piers with high bending moments, increasing the steel grade reduces the number of bars, increases the space between bars, and thereby improves the concrete flow.
Linked Data More info about Linked Acci. Mechanical drilling equipment will normally excavate a relatively flat bottom; exceptions may include stratified sloping rock or broken rock soil interfaces.
Your rating has been recorded. Side-resistance—Friction developed along the side of a drilled pier that transmits vertical forces to the surrounding soil or rock. Advanced Search Find a Library. Reference specifications for the construction of drilled piers ACI The Design Structural Engineer and the Design Geotechnical Engineer should be retained for construction inspection and construction engineering because design decisions will be required during construction of the foundations.
Excluding local code restrictions, piers excavated in some dense and hard clay soil could safely remain open more than one day. The other is an annular space between a permanent form liner and an oversized temporary casing installed during excavation.
Because the design bearing value is based on certain assumptions with regard to strength and compressibility, the Design Geotechnical Engineer should decide the type and amount of testing necessary to satisfy the design assumptions. Inspection and testing will be done using the criteria set forth in the Contract Documents. If down-hole inspection is precluded, either because of the presence of gas or other safety issues, or excavation is occurring under slurry, indirect measurements taken from the top of the shaft will be required.
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. Amazon Renewed Refurbished products with a warranty. Please create a new list with a new name; move some items to a new or existing list; or delete some items. The Testing Agency should be retained by the Owner. Learn more about Amazon Prime. Your request to send this item has been completed. The Design Geotechnical Engineer, in consultation with the Design Structural Engineer, should recommend the minimum grout properties.
CVS Roadway and A Annular void space between permanent liner and temporary casing should be backfilled before removing the outer temporary casing to avoid adjacent ground settlement because the soil will eventually collapse into any void space.
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If you are a seller for this product, would you like to suggest updates through seller support? Review drilled pier acceptance criteria with the Design Geotechnical Engineer.
Pig—Also called a rabbit or go-devil. Preview this item Preview this item. In these situations, stepped bottoms and even sloping bottoms may be acceptable, depending on the degree of lateral confinement of the pier. Any general contractor desiring to subcontract the drilled pier work should ensure that the proposed aic has fulfilled those requirements. Submit a detailed description of field procedures for pier construction, whether a wet or dry method is to be used, including procedures for sci, dewatering, slurry type, and source and casing withdrawal, if applicable; and f.
Allow this favorite library to be seen by others Keep this favorite library private. To ensure complete filling, the grout should be pumped through a pipe extending to the bottom of the annular void space.
The above publications can be obtained from the following organizations additional references can be found in Section 1. No end bearing 4. Where casing is withdrawn, provide concrete with a minimum slump of 6 to 8 in. Although the requirements for cleaning the bottom of the excavation for ai resistance piers is not as strict as that for end-bearing piers, small amounts of sediment, if mixed with the concrete, can result in a significant lowering of concrete strength.
Permanent casing, when part of the design, should be specified and shown on the Contract Documents. You may send this item to up to five recipients.
A preconstruction conference with the successful bidder is recommended, except for small or routine projects. A statement such as the following will serve to make ACI Specification Acceptance of the drilled pier bearing stratum and drilled pier as-built installation is usually done by the Geotechnical Engineer. Share your thoughts with other customers. With regard to the bearing stratum, the type and number of tests performed and any specific acceptance criteria is determined by the Geotechnical Engineer.
The center at cut-off shall be the center as permitted in Section 3.