1、Designation: C923 08 (Reapproved 2013)Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals1This standard is issued under the fixed designation C923; the number immediately following the designation indicates the year oforiginal adoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.
3、1 This specification covers the minimum performance andmaterial requirements for resilient connectors used for connec-tions between reinforced concrete manholes conforming toSpecification C478 and pipes, between wastewater structuresand pipes, and between precast reinforced concrete pipe andlaterals
4、.1.1.1 These connectors are designed to minimize leakagebetween the pipe and manhole, and between the pipe andlateral.1.2 Acomplete metric companion to Specification C923 hasbeen developedC923M; therefore, no metric equivalents arepresented in this specification.NOTE 1This specification covers the d
5、esign, material, and perfor-mance of the resilient connection only. Connections covered by thisspecification are adequate for hydrostatic pressures up to 13 psi (30 ft)without leakage when tested in accordance with Section 7. Infiltration orexfiltration quantities for an installed system are depende
6、nt upon manyfactors other than the connections between manhole structures and pipe,and allowable quantities must be covered by other specifications andsuitable testing of the installed pipeline and system.1.3 The following precautionary caveat pertains only to thetest methods portion, Section 7, of
7、this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use. F
8、or a specific precaution statement, see7.2.5.2. Referenced Documents2.1 ASTM Standards:2A493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA666 Specification for Annealed or Cold-Worked AusteniticStainless Steel Sheet, Strip, Plate, and Flat BarC478 Specificati
9、on for Precast Reinforced Concrete Man-hole SectionsC822 Terminology Relating to Concrete Pipe and RelatedProductsC913 Specification for Precast Concrete Water and Waste-water StructuresD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic Ela
10、stomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD573 Test Method for RubberDeterioration in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD883
11、Terminology Relating to PlasticsD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1566 Terminology Relating to RubberD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD2240 Test Method for Rubber PropertyDurometer Hard-n
12、essNOTE 2For more information about wastewater structures, see Speci-fication C913.3. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber shall be asdefined in Terminologies D883 and D1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelated products s
13、hall be as defined in Terminology C822 andas modified in 3.1.3-3.1.6.3.1.3 connectorthe entire assembly including resilientseals and metallic or nonmetallic mechanical devices, if any,used therein.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct r
14、esponsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved July 1, 2013. Published July 2013. Originally approvedin 1979. Last previous edition approved in 2008 as C923 08. DOI: 10.1520/C0923-08R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
15、tact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.4 lateralthe small
16、 diameter pipe connected to themain line pipe.3.1.5 pipethe inlet or outlet pipe connected to the man-hole.3.1.6 pipe stuba short section of pipe, installed in thestructure as an inlet or outlet pipe, for future connection.4. Materials and Manufacture4.1 All materials shall conform to the following
17、require-ments:4.1.1 Resilient materials for connectors and filler rings shallbe manufactured from natural or synthetic rubber and shallconform to the requirements prescribed in Table 1. If a spliceis used in the manufacture of the seal, its strength shall be suchthat the seal shall withstand a 180 b
18、end with no visibleseparation.4.2 Mechanical DevicesExpansion rings, tension bands,and take-up devices used for mechanically compressing theresilient portion of the connector against the pipe, manhole orwastewater structure shall be made from a material or materialsin combination that will ensure du
19、rability, strength, resistanceto corrosion, and have properties that will ensure continuedresistance to leakage. All metallic mechanical devices, includ-ing castings and bolt assemblies used to mechanically deformresilient materials shall be constructed of corrosion resistantmaterials meeting the ph
20、ysical properties and chemical com-position requirements of Specifications A493 and A666, Type302 through Type 316.NOTE 3Experience has shown that successful performance of thisproduct depends on the type of bedding and backfill and the care in thefield installation of the manhole or wastewater stru
21、cture and connectingpipes. The owner is cautioned to require inspection at the construction site.5. Principles of Design5.1 The design of the connector shall be such that positiveseal is accomplished at two locations: (1) between the connec-tor and the wall of the manhole or wastewater structure and
22、 (2)between the connector and the pipe. The seal between theconnector and the wall of the manhole or wastewater structureshall be made by either mechanical means, compression of theresilient material between the outside surface of the pipe andthe pipe opening in the wall of the manhole or wastewater
23、structure, or by casting the connector integrally with the wall ofthe manhole or wastewater structure. The seal between theconnector and the pipe shall be made by mechanical means orby compression of the resilient material against the outside ofthe pipe. Resilient filler rings are not prohibited fro
24、m beingused between the pipe and the connector to provide a seal.Whichever design is used, it shall be capable of maintaining aresilient, hydrostatic seal under the performance conditions inaccordance with Section 7. Devices used to effect mechanicalseals shall conform to the requirements specified
25、in Section 4.5.2 For lateral to pipe connectors, the design of the connec-tor shall be such that a positive seal is accomplished at twolocations: (1) between the connector and the pipe wall and (2)between the connector and the lateral. The seal between theconnector and the pipe wall shall be made by
26、 either mechanicalmeans, compression, or by casting the connector integrallywith the pipe wall. The seal between the connector and thelateral shall be made by either mechanical means or bycompression of the resilient material against the outside of thepipe. Resilient filler rings are not prohibited
27、from being usedbetween the lateral and the connector to provide a seal.Connector design must not allow either lateral or connector toextend past the cylindrical plane of the pipe inside diameter.The connector shall be capable of maintaining a resilienthydrostatic seal under the performance condition
28、s in accor-dance with Section 7. Devices used to effect mechanical sealsshall conform to the requirements specified in Section 4.5.3 Purchaser shall require that all pipe stubs installed, toallow for future connection to the manhole or wastewaterstructure, be mechanically restrained from movement by
29、means of, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 36 in. and smaller, at least one connectorshall be tested for each 6 in. increment in diameter. Fordiameters larger than 36 in., at least one connector shall betested for each 12 in. increment in diameter.T
30、ABLE 1 Resilient Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D543, at 22C for 48 h1 N sulfuric acid no weight loss1 N hydrochloric acid no weight lossTensile strength 1200 psi, min D412Elongation at break 350 %, minHardnessB5 from the connector manufacturers specified h
31、ard-nessD2240 (Shore A durometer)Accelerated oven-aging decrease of 15 %, max, of original tensile strength,decrease of 20 %, max, of elongationD573, 70 1C for 7 daysCompression set decrease of 25 %, max, of original deflection D395, Method B, at 70C for 22 hWater absorption increase of 10 %, max, o
32、f original by weight D471, immerse 0.75 by 2 in. specimen indistilled water at 70C for 48 hOzone resistance rating 0 D1149Low-temperature brittle point no fracture at 40C D2137Tear resistance 200 lbf/in. D624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared from
33、 laboratory slabs or by direct molding.BThe connector manufacturer shall select the hardness appropriate for each component of the connector. Thereafter, the hardness shall comply within the tolerances inTable 1.C923 08 (2013)26.2 The acceptability of the resilient connector shall bedetermined by th
34、e results of the physical tests prescribed in thisspecification, if and where required, and by inspection, todetermine whether the connector conforms to the specificationwith regards to design and freedom from defects.6.3 When requested, a current certification shall be fur-nished as the basis of ac
35、ceptance. The certification shall consistof the connector manufacturers test report, or statement by themanufacturer, accompanied by a copy of the test results, thatthe resilient connector has been tested and inspected inaccordance with the provisions of Section 4 and Section 7.Each certification so
36、 furnished shall be signed by the connectormanufacturer or an authorized agent.NOTE 4Certification shall be deemed current, if it represents presentdesign, and bears a date that is no more than five years older than thecurrent date.7. Test Methods and Requirements7.1 Install a pipe(s) and the resili
37、ent connector(s) to betested in the base section of a manhole or wastewater structure.Subject the assembly to the prescribed hydrostatic pressure in7.2 at the centerline of the connector for a period of 10 min foreach test condition. Restrain the pipe against axial movementduring the tests.NOTE 5The
38、 user of this specification is advised that if manhole basesgreater than 48 in. inside diameter are required to accommodate largediameter connectors for the test, all safety requirements and proceduresshould be reviewed prior to the test.7.1.1 Install a lateral and resilient connector to be tested i
39、ntothe pipe. Subject the assembly to the prescribed hydrostaticpressure in 7.2 at the centerline of the connector for a period of10 min for each test condition. Restrain the lateral against axialmovement during the tests.7.2 There shall be no leakage under any of the followingconditions:7.2.1 Straig
40、ht alignment of the pipe(s)/lateral(s) subjected toa hydrostatic pressure of 13 psi (30 ft) for 10 min.7.2.2 Axial deflection of the pipe(s)/lateral(s). Uponcompletion of the test for straight alignment in 7.2.1 thepipe(s)/lateral(s) shall be axially deflected at least 7 in anydirection and subjecte
41、d to a hydrostatic pressure of 10 psi (23ft.) for 10 min.7.2.3 When the pipe is loaded in shear in accordance withthe requirements shown in Fig. 1 and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.4 When the lateral is loaded in shear in accordance withthe loading requirements
42、 of Fig. 1 and does not exceed 1 in. ofaxial movement at the connector and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.5 Note: Pressure is not prohibited from being relievedwhile deflecting or loading test section.7.3 Leakage shall be construed to mean freely drippingwater e
43、manating at the interface between the connector andbase of the manhole or wastewater structure, or the pipe;between the connector and the filler rings; or through the bodyof the connector and the filler rings; or through the body of theconnector itself.7.4 Moisture appearing at random locations on t
44、he base ofthe outlet in the form of patches or beads adhering to thesurfaces shall not be considered leakage.7.5 A delay of up to 24 h is not prohibited prior to makingobservations of leakage.8. Product Marking8.1 Each connector shall be marked legibly by the connectormanufacturer with his trade nam
45、e and the size designation orpart number.9. Keywords9.1 definitions; design test method; marking; material re-quirements acceptance criteria; product marking; resilient con-nectorASTM International takes no position respecting the validity of any patent rights asserted in connection with any item me
46、ntionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committe
47、e and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeti
48、ng of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO
49、 Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 1 Shear Test RequirementsC923 08 (2013)3
