1、Designation: C 923 08Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals1This standard is issued under the fixed designation C 923; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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. Scope1.1 This specific
3、ation covers the minimum performance andmaterial requirements for resilient connectors used for connec-tions between reinforced concrete manholes conforming toSpecification C 478 and pipes, between wastewater structuresand pipes, and between precast reinforced concrete pipe andlaterals.1.1.1 These c
4、onnectors are designed to minimize leakagebetween the pipe and manhole, and between the pipe andlateral.1.2 A complete metric companion to Specification C 923has been developedC 923M; therefore, no metric equivalentsare presented in this specification.NOTE 1This specification covers the design, mate
5、rial, 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 dependent upon man
6、yfactors 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 this specif
7、ication: 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. For a specif
8、ic precaution statement, see7.2.5.2. Referenced Documents2.1 ASTM Standards:2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA 666 Specification for Annealed or Cold-Worked Austen-itic Stainless Steel Sheet, Strip, Plate, and Flat BarC 478 Specification for
9、 Precast Reinforced Concrete Man-hole SectionsC 822 Terminology Relating to Concrete Pipe and RelatedProductsC 913 Specification for Precast Concrete Water and Waste-water StructuresD 395 Test Methods for Rubber PropertyCompressionSetD 412 Test Methods for Vulcanized Rubber and Thermo-plastic Elasto
10、mersTensionD 471 Test Method for Rubber PropertyEffect of LiquidsD 543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD 573 Test Method for RubberDeterioration in an AirOvenD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 883
11、Terminology Relating to PlasticsD 1149 Test Methods for Rubber DeteriorationCrackingin an Ozone Controlled EnvironmentD 1566 Terminology Relating to RubberD 2137 Test Methods for Rubber PropertyBrittlenessPoint of Flexible Polymers and Coated FabricsD 2240 Test Method for Rubber PropertyDurometerHar
12、dnessNOTE 2For more information about wastewater structures, see Speci-fication C 913.3. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber shall be asdefined in Terminologies D 883 and D 1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelated produ
13、cts shall be as defined in Terminology C 822 andas modified in 3.1.3-3.1.6.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved March 1, 2008. Published April 2008.
14、 Originallyapproved in 1979. Last previous edition approved in 2007 as C 923 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page
15、onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 connectorthe entire assembly including resilientseals and metallic or nonmetallic mechanical devices, if any,used therein.3.1.4 lateralthe small diameter pipe c
16、onnected 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 require-ments:4.
17、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 bend with no visi
18、bleseparation.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 durability, streng
19、th, 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 physical propertie
20、s and chemical com-position requirements of Specifications A 493 and A 666, 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 structure and conn
21、ectingpipes. 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 (2) between t
22、he 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 wastewaterstructure, or
23、 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 from beingused b
24、etween 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 in Section 4.
25、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 either mecha
26、nicalmeans, 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 from being us
27、edbetween 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 conditions in accor-da
28、nce 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 bymeans of, and
29、 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.TABLE 1 Resili
30、ent Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D 543, at 22C for 48 h1 N sulfuric acid no weight loss1 N hydrochloric acid no weight lossTensile strength 1200 psi, min D 412Elongation at break 350 %, minHardnessB65 from the connector manufacturers specifiedhardnessD 22
31、40 (Shore A durometer)Accelerated oven-aging decrease of 15 %, max, of original tensile strength,decrease of 20 %, max, of elongationD 573,706 1C for 7 daysCompression set decrease of 25 %, max, of original deflection D 395, Method B, at 70C for 22 hWater absorption increase of 10 %, max, of origina
32、l by weight D 471, immerse 0.75 by 2 in. specimen indistilled water at 70C for 48 hOzone resistance rating 0 D 1149Low-temperature brittle point no fracture at 40C D 2137Tear resistance 200 lbf/in. D 624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared from labo
33、ratory 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 tolerancesin Table 1.C9230826.2 The acceptability of the resilient connector shall bedetermined by the results of
34、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 acceptance. The
35、 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 furnished sh
36、all 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 resilient connector
37、(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 user of thi
38、s 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 intothe pipe.
39、 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 againstaxial movement during the tests.7.2 There shall be no leakage under any of the followingconditions:7.2.1 Straight alignmen
40、t 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 subjected to a hydr
41、ostatic 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 of Fig. 1
42、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 emanating at
43、 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 the base oft
44、he 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 name and the s
45、ize designation orpart number.9. Keywords9.1 definitions; design test method; marking; material re-quirements acceptance criteria; product marking; resilientconnectorASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin thi
46、s 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 committee and must be
47、 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 meeting of theresp
48、onsible 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 Box C700, We
49、st 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).FIG. 1 Shear Test RequirementsC923083
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