AASHTO HB-17 DIVISION II SEC 29-2002 Division II Construction - Embedment Anchors《埋锚》.pdf

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1、29.1 DESCRIPTION Section 29 EMBEDMENT ANCHORS This specification covers installation and field testing of cast-in-place, grouted, adhesive-bonded, expansion and undercut steel anchors. 29.2 PREQUALIFICATION Prequalify all concrete anchors, including cast-in- place, all bonded anchor systems (includi

2、ng grout, chem- ical compounds, and adhesives), and undercut by univer- sal test standards designed to allow approved anchor systems to be employed for any construction attachment use. Conduct test for adhesive-bonded and other bonding compounds in accordance with ASTM E 1512 (Standard Test Methods

3、for Testing Bond Performance of Adhesive- Bonded Anchors). Test expansion types to ASTM E 488 (Standard Test Methods for Strength of Anchors in Concrete and Ma- sonry Elements). Comply with AC1 349-85 (Code Requirements for Nuclear Safety Related Concrete Structures-Appendix B, Steel Embedments). Pr

4、ovide certified test reports prepared by an indepen- dent laboratory documenting that the system (except me- chanical expansion anchors) is capable of achieving the minimum tensile strength of the embedment steel. 29.3 MATERIALS Provide mill test reports certifying physical properties, chemistry, an

5、d strengths. The chemical compounds acceptable for adhesive an- chors may include epoxies, polyesters, or vinylesters. Ad- hesive compounds which are moisture-insensitive, high- modulus, high-strength, and low-shrinkage should be used. The use of additives to grout, and bonding materials which will

6、be corrosive to steel or zinckadmium coatings is prohibited. 29.4 CONSTRUCTION METHODS Provide adequate edge distance, embedment depth and spacing to develop the required strength of the embed- ment anchors. Use the correct drill hole diameter as per manufacturers instructions. Use rotary impact dri

7、lling equipment unless diamond core drilling has been speci- fied and tested. If reinforcing bar is encountered during the drilling operation, move to a different location, or drill through the reinforcing steel using a diamond core bit as directed by the Engineer. Patch abandoned holes with an appr

8、oved bonding material. Clean holes thoroughly as recommended by the manufacturer. Remove all loose dust and concrete particles from hole. Prepare bonding mater- ial and install anchors according to instructions provided by the manufacturer or approved by the Engineer. Embedded anchors which are impr

9、operly installed or which do not have the required strength shall be remdved and replaced to the satisfaction of the Engineer at the Contractors expense. 29.5 INSPECTION AND TESTING Where specified, conduct sacrificial tests of the anchor system on the job site to ultimate loads to document the capa

10、bility of the system to achieve pullout loads equaling the full minimum tensile value of the anchor employed. Test the anchor on fully cured concrete samples. Unless specified otherwise, test no fewer than three (3) anchors by ASTM E 488 methods. The Contractor may use any pre- qualified anchor syst

11、ems meeting the above requirements. Provide, without delay in progress, for an alternate sys- tem that will reach the designated pull-out requirement if the job site proofloading proves incapable of achieving minimum tensile values (or the designers required load if too little concrete exists in whi

12、ch to develop full ductile loads). After installing the curing of bonding material, torque each anchor system to values specified. If torque values are not specified, use values recommended by the manu- facturer or provided by the Engineer. 685 686 HIGHWAY BRIDGES 29.6 29.6 MEASUREMENT 29.7 PAYMENT

13、Count and summarize each embedment anchor type satisfactorily installed for the Contract, according to an- chor system, orientation (vertical, diagonal, and horizon- tal), and size (diameter). Payment for the quantity of embedment anchors deter- mined under measurement for each embedment anchor type, shall include full compensation for furnishing all labor, materials, tools, equipment, testing, and incidentals necessary to place each anchor type.