美国桩基规范摘录

1、 Jack Lettiere, Jr., President Commissioner New Jersey Department of Transportation American Association of State Highway and John Horsley Transportation Officials Executive Director Executive Office: 444 N. Capitol St., N.W., Suite 249, Washington, D.C. 20001 Telephone (202) 624-5800 Telefax (202) 624-5806 Telex 49000095800 HTO ERRATA Dear Customer: Due to errors found after the publication had been completed, AASHTO has reprinted the pages listed below and made the following errata changes to

2、the AASHTO LRFD Bridge Construction Specifications, 2nd Edition: Please substitute the original pages of text with the enclosed pages. We apologize for any inconvenience this may have caused. AASHTO Publications Staff January 2005 Replacement Pages Affected Article Errata Change p. 4-15/4-16 4.4.6 Remove extraneous bullet points from commentary column. (This is an editorial correction to clarify that there is no commentary for this article.) p. 6-11/p. 6-12 6.5.5.3 Display last row of Table 6.5.

3、5.3-1. p. 26-11/p. 26-12 26.5.4.1 Display entire Figure 26.5.4.1-1. p. 27-5/p. 27-6 27.5.2.2 Display entire Figure 27.5.2.2-2. p. 27-11/p. 27-12 27.5.3 Display entire Figure 27.5.3-1. p. 31-7/p. 31-8 31.4.1 Display entire right column of Table 31.4.1-1. p. 31-11/p. 31-12 31.4.11.2 Correct symbols in Eq. 31.4.11.2-1. 31.4.11.3 Correct symbols in Eq. 31.4.11.3-1. 31.4.11.4 Correct symbols in Eq. 31.4.11.4-1. p. 31-15/p. 31-16 31.5.5 Remove extraneous article number from commentary column. (This is

4、 an editorial correction to clarify that there is no commentary for this article.) p. A-21/p. A-22 Appendix Correct symbols in SI version of Eq. 31.4.11.2-1. SECTION 4: DRIVEN FOUNDATION PILES 4-15 where: Sf = settlement at failure, in. D = pile diameter or width, in. S = elastic deformation of total unsupported pile length, in. The top elevation of the test pile shall be determined immediately after driving and again just before load testing to check for heave. Any pile that heaves more than 0.

5、25 in. (6 mm) shall be redriven or jacked to the original elevation prior to testing. Unless otherwise specified in the contract documents, a minimum three-day waiting period shall be observed between the driving of any anchor piles or the load test pile and the commencement of the load test. 4.4.5 Splicing of Piles 4.4.5.1 Steel Piles Full-length piles shall be used where practicable. If splicing is permitted, the method of splicing shall be as specified in the contract documents or as approved

6、 by the Engineer. The arc method of welding shall be preferred when splicing steel piles. Welding shall only be performed by certified welders. 4.4.5.2 Concrete Piles Concrete piles shall not be spliced, other than to produce short extensions as permitted herein, unless specified in the contract documents or in writing by the Engineer. Short extensions or “build-ups” may be added to the tops of reinforced concrete piles to correct for unanticipated events. After the driving is completed, the con

7、crete at the end of the pile shall be cut away, leaving the reinforcing steel exposed for a length of 40 diameters. The final cut of the concrete shall be perpendicular to the axis of the pile. Reinforcement similar to that used in the pile shall be securely fastened to the projecting steel and the necessary form work shall be placed, care being taken to prevent leakage along the pile. The concrete shall be of not less than the quality used in the pile. Just prior to placing concrete, the top of

8、 the pile shall be thoroughly flushed with water, allowed to dry, then covered with a thin coating of neat cement, mortar, or other suitable bonding material. The forms shall remain in place not less than seven days and shall then be carefully removed and the entire exposed surface of the pile finished as previously specified. 4-16 AASHTO LRFD BRIDGE CONSTRUCTION SPECIFICATIONS 4.4.5.3 Timber Piles Timber piles shall not be spliced unless specified in the contract documents or in writing by the

9、Engineer. 4.4.6 Defective Piles The procedure incident to the driving of piles shall not subject them to excessive and undue abuse producing crushing and spalling of the concrete, injurious splitting, splintering and brooming of the wood, or excessive deformation of the steel. Manipulation of piles to force them into proper position, considered by the Engineer to be excessive, will not be permitted. Any pile damaged by reason of internal defects, by improper driving, driven out of its proper location, or driven below the butt elevation fixed by the contract documents or by the Engineer shall be corrected at the Contractors expense by one of the following methods approved by the Engineer for

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