ARMY UFGS-03 23 00-2009 STEEL STRESSING TENDONS AND ACCESSORIES FOR PRESTRESSED CONCRETE《预应力混凝土用加压钢筋和附件》.pdf

1、*USACE / NAVFAC / AFCESA / NASA UFGS-03 23 00 (November 2009)-Preparing Activity: USACE (CW) SupersedingUFGS-03 23 00 (April 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2009*SECTION TABLE OF CONTENTSDIVISION 03 - CONCRETESECTION 03 23 00STEEL STRES

2、SING TENDONS AND ACCESSORIES FOR PRESTRESSED CONCRETE11/09PART 1 GENERAL1.1 LUMP SUM PRICES1.1.1 Steel Stressing Tendons and Accessories for Prestressed Concrete1.1.1.1 Payment1.1.1.2 Unit of Measure1.2 REFERENCES1.3 SUBMITTALS1.4 QUALITY ASSURANCE1.4.1 Certification of Prestressing Technicians1.4.2

3、 Installation Drawings1.5 DELIVERY, STORAGE, AND HANDLINGPART 2 PRODUCTS2.1 MATERIALS2.1.1 Stressing Tendons2.1.1.1 Seven-Wire Stress-Relieved Strand and Strand Assemblies2.1.1.2 Stress-Relieved Wire and Wire Assemblies2.1.1.3 High-Strength Steel Bars2.1.2 Accessories2.1.2.1 Ducts2.1.2.2 Anchorages

4、and Couplers2.1.2.3 Grout2.2 TESTS, INSPECTIONS, AND VERIFICATIONSPART 3 EXECUTION3.1 INSTALLATION3.1.1 Prestressing Method and Equipment3.1.2 Anchorages3.1.3 Stressing Tendons and Ducts3.1.4 Tensioning Tendons3.1.4.1 Pretensioning3.1.4.2 Detensioning3.1.4.3 Post-TensioningSECTION 03 23 00 Page 1Pro

5、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.1.5 Grouting Post-Tensioned Tendons3.1.6 Accuracy of Stress and Elongation Measurement3.1.6.1 Stress Measurement3.1.6.2 Elongation Measurement3.1.7 Prestressing Operations Records3.2 INSPECTION3.3 MATERI

6、ALS DISPOSITION RECORDS- End of Section Table of Contents -SECTION 03 23 00 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-03 23 00 (November 2009)-Preparing Activity: USACE (CW) SupersedingUFGS-03 23 00 (A

7、pril 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2009*SECTION 03 23 00STEEL STRESSING TENDONS AND ACCESSORIES FOR PRESTRESSED CONCRETE11/09*NOTE: This guide specification covers the requirements for furnishing all equipment, materials, techniques a

8、nd labor for providing and installing steel stressing tendons and accessories for the construction of prestressed concrete.Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate info

9、rmation.Remove information and requirements not required in respective project, whether or not brackets are present.Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of technical proponents, including th

10、eir organization designation and telephone number, is on the Internet.Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL1.1 LUMP SUM PRICES*NOTE: If Section 01 22 00.00 10 MEASUREMENT AND PAYMENT is included in the project specifications, this paragr

11、aph title (LUMP SUM PRICES) should be deleted from this section and the remaining appropriately edited subparagraphs should be inserted into Section 01 22 00.00 10.*SECTION 03 23 00 Page 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.1.1 Steel St

12、ressing Tendons and Accessories for Prestressed Concrete1.1.1.1 PaymentPayment will constitute full compensation for furnishing all plant, labor, materials and equipment and performing all operations necessary for steel stressing tendons and accessories for prestressed concrete.1.1.1.2 Unit of Measu

13、reUnit of measure: lump sum.1.2 REFERENCES*NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title.Use the Ref

14、erence Wizards Check Reference feature when you add a RID outside of the Sections Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizards Check Reference feature to update the issue dates.References not used in the text will automatically be de

15、leted from this section of the project specification when you choose to reconcile references in the publish print process.*The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.ACI INTE

16、RNATIONAL (ACI)ACI 318 (2008; Errata 2008; Errata 2009; Errata 2009; Errata 2009; Errata 2009; Errata 2009) Building Code Requirements for Structural Concrete and CommentaryACI 318M (2008; Errata 2008; Errata 2009) Metric Building Code Requirements for Structural Concrete and CommentaryACI SP-66 (20

17、04) ACI Detailing ManualASTM INTERNATIONAL (ASTM)ASTM A 416/A 416M (2006) Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed ConcreteASTM A 421/A 421M (2005) Standard Specification for Uncoated SECTION 03 23 00 Page 4Provided by IHSNot for ResaleNo reproduction or networkin

18、g permitted without license from IHS-,-,-Stress-Relieved Wire for Prestressed ConcreteASTM A 722/A 722M (2007) Standard Specification for Uncoated High-Strength Steel Bar for Prestressing ConcreteASTM C 109/C 109M (2008) Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Usin

19、g 2-in. or (50-mm) Cube Specimens)ASTM C 150/C 150M (2009) Standard Specification for Portland CementASTM C 939 (2002) Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)ASTM C 940 (1998a; R 2003) Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the La

20、boratory1.3 SUBMITTALS*NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. Submittals should be kept to the minimum required for adequate quality control.A “G” following a su

21、bmittal item indicates that the submittal requires Government approval. Some submittals are already marked with a “G”. Only delete an existing “G” if the submittal item is not complex and can be reviewed through the Contractors Quality Control system. Only add a “G” if the submittal is sufficiently

22、important or complex in context of the project.For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be used following the “G“ designation to indicate the approving authority. Codes for Army projects using the Resident Managemen

23、t System (RMS) are: “AE“ for Architect-Engineer; “DO“ for District Office (Engineering Division or other organization in the District Office); “AO“ for Area Office; “RO“ for Resident Office; and “PO“ for Project Office. Codes following the “G“ typically are not used for Navy, Air Force, and NASA pro

24、jects.Choose the first bracketed item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects.*SECTION 03 23 00 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Government approval is required for submittals

25、with a “G“ designation; submittals not having a “G“ designation are for Contractor Quality Control approval. information only. When used, a designation following the “G“ designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Secti

26、on 01 33 00 SUBMITTAL PROCEDURES:SD-02 Shop DrawingsInstallation Drawings; G; G, _Installation drawings for tendons and accessories approved prior to commencing the work.SD-03 Product DataPrestressing Method and Equipment; G; G, _Descriptions of proposed prestressing method and equipment approved pr

27、ior to the start of prestressing operations.Materials Disposition RecordsRecords which identify the incorporation of approved materials into the work before completion of the contract.Prestressing Operations RecordsComplete records of the prestressing operations before completion of the contract.SD-

28、06 Test ReportsStressing Tendons and AccessoriesCertified materials test reports for all required materials tests; note the specific standards followed in the performance of tests, show that materials comply with the applicable specifications for each material shipment, and identified with specific

29、lots prior to use of materials in the work.SD-07 CertificatesCertification of Prestressing TechniciansCertificates for prestressing technicians prior to start of prestressing operations.1.4 QUALITY ASSURANCE1.4.1 Certification of Prestressing TechniciansSubmit certification of Prestressing Technicia

30、ns who will use the proposed system in the work. Certify by name that these technicians are thoroughly trained and skilled in the use of the system.SECTION 03 23 00 Page 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.4.2 Installation DrawingsProv

31、ide detailed installation drawings for stressing tendons and accessories showing the type and size of stressing tendons and anchorages, erection methods, sequence of stressing and stressing calculations.1.5 DELIVERY, STORAGE, AND HANDLINGDeliver materials suitably wrapped, packaged or covered at the

32、 factory to prevent being affected by dirt, water and rust. Protect materials against abrasion or damage during shipment and handling. Materials stored at the site shall be placed above ground on elevated, covered platforms.PART 2 PRODUCTS2.1 MATERIALSStressing tendons and accessories shall conform

33、to the requirements of ACI 318M ACI 318 except as specified.2.1.1 Stressing TendonsStressing tendons shall be clean and free of loose rust, scale and pitting. Permanently protect unbonded tendons from corrosion with an approved applied coating.2.1.1.1 Seven-Wire Stress-Relieved Strand and Strand Ass

34、embliesSeven-wire stress-relieved strand and strand assemblies shall conform to ASTM A 416/A 416M, Grade 250 270, strand diameter as shown. Strand assemblies may be either shop or field assembled with anchor fittings positively attached to strands.2.1.1.2 Stress-Relieved Wire and Wire AssembliesStre

35、ss-relieved wire and wire assemblies shall conform to ASTM A 421/A 421M, Type BA or WA, wire diameter as shown. Wire assemblies shall be shop assembled with anchor fittings positively attached to wires.2.1.1.3 High-Strength Steel BarsHigh-strength steel bars shall conform to ASTM A 722/A 722M, Type

36、I or II, meeting all supplementary requirements.2.1.2 Accessories2.1.2.1 DuctsProvide tendon ducts of ferrous metal, capable of transmitting forces from grout to the surrounding concrete, flexible enough to conform to the tendon profile and strong enough to maintain their shape without deforming, sa

37、gging, or collapsing during concrete placement and vibration. The inside diameter of the ducts shall be large enough to provide an internal area at least twice the gross area of multiple wire, bar or strand assemblies and shall be at least 6 mm 1/4-inch larger than the diameter of a single wire, bar

38、 or strand placed in the ducts. Design ducts for watertight connections with all fittings. Galvanized ducts will not be permitted.SECTION 03 23 00 Page 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.1.2.2 Anchorages and CouplersAnchorages and cou

39、plers shall be metal of proven corrosion resistance and compatible with the stressing tendons, capable of fully developing the minimum guaranteed ultimate strength of tendons without excessive slip and approved. Anchorages shall be the button-head, wedge, nut and thread, grip nut, thread-bar, thread

40、ed plate or other approved type and shall be provided with bearing plates bars, rings, bells or other positive-attaching anchor fittings. Provide couplers with housings long enough to permit the necessary movements and fittings which allow complete grouting of all components.2.1.2.3 GroutGrout for g

41、routing post-tensioned tendons shall consist of a mixture of Portland cement, shrinkage compensating admixture and potable water of which final proportions shall be based on test results of sample mixtures. Cement shall conform to ASTM C 150/C 150M, Type I or II. The shrinkage compensating admixture

42、 shall produce a 2 percent minimum and a 10 percent maximum unconfined expansion when tested in accordance with ASTM C 940, shall not contain aluminum powder, chlorides, fluorides or nitrates, may be dispensed in solid or liquid form and must be approved by the Contracting Officer prior to its use.

43、The water content shall be the minimum necessary for proper placement but the water-cement ratio shall not exceed 0.50 by weight. Determine the pumpability of grout in accordance with ASTM C 939. The efflux time of a grout sample immediately after mixing shall not be less than 11 seconds. The minimu

44、m 7-day compressive strength of 50 mm 2-inch grout cubes, molded, cured and tested in accordance with ASTM C 109/C 109M shall be 17.2 MPa 2500 psi.2.2 TESTS, INSPECTIONS, AND VERIFICATIONSPerform required material tests on stressing tendons and accessories by an approved laboratory to demonstrate th

45、at the materials are in conformance with the specifications. These tests shall be at the Contractors expense.PART 3 EXECUTION3.1 INSTALLATIONStressing tendons and accessories shall be installed or placed as specified and as shown on contract and approved installation drawings. Installation details of stressing tendons and accessories not specified or shown shall be in accordance with ACI SP-66 or ACI 318M ACI 318. Welding shall not be performed near or adjacent to stressing tendons. Stressing tendons shall not be installed until all wel