AASHTO-HB-17-DIVISION-II-SEC-30-2002.pdf
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1、. 30.1 GENERAL 30.1.1 Description Section 30 THERMOPLASTIC PIPE This work shall consist of furnishing and installing thermoplastic pipe in conformance with these Specifica- tions, any special provisions, and the details shown on the plans. As used in this specification, thermoplastic pipe is defined
2、 in Division I, Section 17, “Soil-Thermoplastic Pipe Interaction Systems.” 30.1.2 Workmanship and Inspection All thermoplastic pipe materials shall conform to the workmanship and inspection requirements of AASHTO M 278, M 294, or M 304; or ASTM F 679, F 714, F 794, or F 894 as applicable. 30.2 WORKI
3、NG DRAWINGS Whenever specified or requested by the Engineer, the Contractor shall provide manufacturers installation in- structions or working drawings with supporting data in sufficient detail to permit a structural review. Sufficient copies shall be furnished to meet the needs of the Engi- neer an
4、d other entities with review authority. The work- ing drawings shall be submitted sufficiently in advance of proposed installation and use to allow for their review, revision, if needed, and approval without delay of the work. The Contractor shall not start construction of any thermoplastic pipe ins
5、tallations for which working draw- ings are required until the drawings have been approved by the Engineer. Such approval will not relieve the Con- tractor of responsibility for results obtained by use of these drawings or any of the other responsibilities under the contract. 30.3 MATERIALS 30.3.1 T
6、hermoplastic Pipe Polyethylene pipe shall conform to the requirements of AASHTO M 294, or ASTM F 714, or ASTM F 894. Poly(Viny1 Chloride) (PVC) pipe shall conform to the requirements of AASHTO M 278 or M 304; or ASTM F 679 or F 794. 30.3.2 Bedding Material and Structurai Backfill Bedding and structu
7、ral backfill shall meet the re- quirements ofAASHTO M 145,A-1, A-2-4, A-2-5, or A- 3. Bedding material shall have a maximum particle size of 1.25 inch. Backfill for thermoplastic pipe shall be free o f organic material, stones larger than 1 ! 4 inch in great- est dimension, or frozen lumps. Moisture
8、 content shall be in the range of optimum (typically -3% to +2%) per- mitting thorough compaction. Consideration should be given to the potential for migration of fines from adja- cent materials into open-graded backfill and bedding materials. For pipe types that are not smooth on the outside (cor-
9、rugated or profile walls), backfill gradations should be se- lected that will permit the filling of the corrugation or pro- file valleys. Flowable fills, such as controlled low strength mortar (CLSM) or controlled density fill (CDF), may be used for backfill and bedding provided adequate flotation r
10、e- sistance can be achieved by restraints, weighting, or placementtechnique. With CLSM backfill, trench width can be reduced to a minimum of the outside diameter plus 12 inches. When CLSM is used all joints shall have gaskets. 687 Copyright American Association of State Highway and Transportation Of
11、ficials Provided by IHS under license with AASHTO Licensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 01/11/2009 02:30:18 MSTNo reproduction or networking permitted without license from IHS -,-,- - 688 HIGHWAY BRIDGES 30.5.4 30.4 ASSEMBLY 30.4.1 General Thermoplastic pipe sha
12、ll be assembled in accordance with the manufacturers instructions. All pipe shall be un- loaded and handled with reasonable care. Pipe shall not be rolled or dragged over gravel or rock and shall be pre- vented from striking rock or other hard objects during placement in trench or on bedding. Thermo
13、plastic pipe shall be placed in the bed starting at the downstream end. 30.4.2 Joints Joints for thermoplastic pipe shall meet the perfor- mance requirements for soiltightness unless watertight- ness is specified. (a) Corrugated bands (with or without gaskets) (b) Bell and spigot pipe ends (with or
14、without gaskets) (c) Double bell couplings (with or without gaskets) 30.5 INSTALLATION 30.5.1 General Installation Requirements Trenches must be excavated in such a manner as to in- sure that the sides will be stable under all working condi- tions. Trench walls shall be sloped or supported in con- f
15、ormance with all standards of safety. Only as much trench as can be safely maintained shall be opened. All G L I I G atmi UG UdLKlllltxI as soon as praciicabie, but not later than the end of each working day. Trench details, including foundation, bedding, haunch- ing, initial backfill, final backfil
16、l, pipe zone, and trench width are shown in Figure 30.5.1. - I.“ -L 11 L- L.-l-c*l- 2 - - - - 30.4.2.1 Field Joints 30.5.2 Trench Widths Joints shall be so installed that the connection of pipe sections will form a continuous line free from irregulari- ties in the flow line. Suitable field joints ca
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- AASHTO HB 17 DIVISION II SEC 30 2002
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