1、Designation: C923M 08b (Reapproved 2013)Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals (Metric)1This standard is issued under the fixed designation C923M; the number immediately following the designation indicates the year oforiginal
2、 adoption or, 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.1. Scope1.1 This specification covers the minimum performance andmaterial requi
3、rements for resilient connectors used for connec-tions between precast reinforced concrete manholes conform-ing to Specification C478 and pipes, and between precastreinforced concrete pipe and laterals.1.1.1 These connectors are designed to minimize leakagebetween the pipe and manhole, and between t
4、he pipe andlateral.1.2 This specification is the SI companion to SpecificationC923.NOTE 1This specification covers the design, material, and perfor-mance of the resilient connection only. Connections covered by thisspecification are adequate for hydrostatic pressures up to 70 kPa (7.1 m)without leak
5、age when tested in accordance with Section 7. Infiltration orexfiltration quantities for an installed system are dependent upon manyfactors other than the connections between manhole structures and pipe,and allowable quantities must be covered by other specifications andsuitable testing of the insta
6、lled pipeline and system.1.3 The following precautionary caveat pertains only to thetest methods portion, Section 7, of 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 est
7、ablish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use. For 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 ForgingA6
8、66 Specification for Annealed or Cold-Worked AusteniticStainless Steel Sheet, Strip, Plate, and Flat BarC478 Specification for Precast Reinforced Concrete Man-hole SectionsC822 Terminology Relating to Concrete Pipe and RelatedProductsC913 Specification for Precast Concrete Water and Waste-water Stru
9、cturesD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD573 Test Method for RubberDeteriorat
10、ion in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD883 Terminology Relating to PlasticsD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1566 Terminology Relating to RubberD2137 Test Methods for Rubb
11、er PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD2240 Test Method for Rubber PropertyDurometer Hard-nessNOTE 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 T
12、erminologies D883 and D1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelated products shall 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
13、any,used therein.3.1.4 lateralthe small diameter pipe connected to themain line.3.1.5 pipethe inlet or outlet pipe connected to the man-hole.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Spec
14、ials.Current edition approved July 1, 2013. Published July 2013. Originally approvedin 1980. Last previous edition approved in 2008 as C923M 08b. DOI: 10.1520/C0923M-08BR13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For A
15、nnual 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 States13.1.6 pipe stuba capped or plugged pipe, or section ofpipe, installed in a
16、 manhole to allow for future connections.4. Materials and Manufacture4.1 All materials shall conform to the following 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
17、 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 visibleseparation.4.2 Mechanical DevicesExpansion rings, tension bands,and take-up devices used for mechanically compressing theresilient portion of the connector against
18、 the pipe or manholeshall be made from a material or materials in combination thatwill ensure durability, strength, resistance to corrosion, andhave properties that will ensure continued resistance to leak-age. All metallic mechanical devices and bolt assemblies usedto mechanically deform resilient
19、materials shall be constructedof corrosion resistant materials meeting the physical propertiesand chemical composition requirements of Specifications A493and A666, Type 302 through Type 316.NOTE 3Experience has shown that successful performance of thisproduct depends on the type of bedding and backf
20、ill and the care in thefield installation of the manhole and connecting pipes. The owner iscautioned 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
21、the wall of the manhole or wastewater structure and (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 pi
22、pe opening in the wall of the manhole or wastewaterstructure, 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
23、pipe. Resilient filler rings are not prohibited from 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 mechanica
24、lseals shall conform to the requirements specified 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 betw
25、een theconnector and the pipe wall shall be made by 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
26、thepipe. Resilient filler rings are not prohibited 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 resili
27、enthydrostatic seal under the performance conditions in accor-dance with Section 7. Devices used to effect mechanical sealsshall conform to the requirements specified in Section 4.5.3 Pipe StubsOwners shall require that all pipe stubsinstalled, to allow for future connections to manhole structures,b
28、e mechanically restrained from movement by means otherthan, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 900 mm and smaller, at least one connectorshall be tested for each 150 mm increment in diameter. Fordiameters larger than 900 mm, at least one connector sha
29、ll betested for each 300 mm increment in diameter.6.2 The acceptability of the resilient connector shall bedetermined by the results of the physical tests prescribed in thisspecification, if and where required, and by inspection, todetermine whether the connector conforms to the specificationwith re
30、gards to design and freedom from defects.6.3 When requested, a current certification shall be fur-nished as the basis of acceptance. The certification shall consistTABLE 1 Resilient Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D543, at 22C for 48 h1 N sulfuric acid no we
31、ight loss1 N hydrochloric acid no weight lossTensile strength 8.5 MPa, min D412Elongation at break 350%, minHardnessB 5 from the connector manufacturers specified hardness D2240 (Shore A durometer)Accelerated oven-aging decrease of 15%, max, of original tensile strength, de-crease of 20%, max, of el
32、ongationD573, 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, of original by weight D471, immerse 19 by 25-mm specimen in distilledwater at 70C for 48 hOzone resistance rating 0 D1149Low-temperature br
33、ittle point no fracture at 40C D2137Tear resistance 34 kN/m D624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared from laboratory slabs or by direct molding.BThe connector manufacturer shall select the hardness appropriate for each component of the connector. Th
34、ereafter, the hardness shall comply within the tolerances inTable 1.C923M 08b (2013)2of 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 S
35、ection 4 and Section 7.Each certification so furnished shall be signed by the connectormanufacturer or an authorized agentNOTE 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 Requi
36、rements7.1 Install a pipe and the resilient connector to be tested inthe manhole base 1200 mm inside diameter or smaller. Subjectthe assembly to a hydrostatic pressure of 70 kPa (7.1 m) at thecenter line of the connector for a period of 10 min. Restrain thepipe against axial movement during the test
37、s.NOTE 5The user of this specification is advised that if manhole basesgreater than 1200 mm 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
38、 be tested intothe pipe. Subject the assembly to a hydrostatic pressure of 70kPa (7.1 m) at the center line of the connector for a period of10 min. Restrain the lateral against axial movement during thetests.7.2 There shall be no leakage under any of the followingconditions:7.2.1 Straight alignment
39、of the pipe/lateral.7.2.2 Axial deflection of the pipe/lateral of at least 7 in anydirection.7.2.3 When the pipe is loaded in shear in accordance withthe requirements shown in Fig. 1.7.2.4 When the lateral is loaded in shear in accordance withthe loading requirements of Fig. 1 and does not exceed 25
40、 mmof axial movement at the connector.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 the interface between the connector andeither the manhole base, the pipe, or the lateral;
41、between theconnector and the filler rings; or through the body of theconnector and the filler rings; or through the body of theconnector itself.7.4 Moisture appearing at random locations on the base ofthe outlet in the form of patches or beads adhering to thesurfaces shall not be considered leakage.
42、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 size designation orpart number.9. Keywords9.1 definitions; design test method; marking; material re
43、-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 mentionedin this standard. Users of this standard are expressly advised that determination of the validity of a
44、ny 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 reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are
45、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 theresponsible technical committee, which you may attend. If you feel that your comments have not recei
46、ved 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, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of
47、 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 RequirementsC923M 08b (2013)3
