1、Designation: C923 08 (Reapproved 2013)1C923 18Standard 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 ado
2、ption 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.This standard has been approved for use by agencies of the U.S. Department of Defen
3、se.1 NOTEEditorially corrected 5.3 in January 2016.1. Scope1.1 This specification covers the minimum performance and material requirements for resilient connectors used for connectionsbetween reinforced concrete manholes conforming to Specification C478 and pipes, between wastewater structures and p
4、ipes, andbetween precast reinforced concrete pipe and laterals.1.1.1 These connectors are designed to minimize leakage between the pipe and manhole, and between the pipe and lateral.1.2 A complete metric companion to Specification C923 has been developedC923M; therefore, no metric equivalents arepre
5、sented in this specification.NOTE 1This specification covers the design, material, and performance of the resilient connection only. Connections covered by this specificationare adequate for hydrostatic pressures up to 13 psi (30 ft) without leakage when tested in accordance with Section 7. Infiltra
6、tion or exfiltration quantitiesfor an installed system are dependent upon many factors other than the connections between manhole structures and pipe, and allowable quantities mustbe covered by other specifications and suitable testing of the installed pipeline and system.1.3 The following precautio
7、nary caveat pertains only to the test methods portion, Section 7, of this specification: This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety safety, health, and heal
8、thenvironmental practices and determine the applicability ofregulatory limitations prior to use. For a specific precaution statement, see 7.2.5.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Prin
9、ciples for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A493 Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold ForgingA6
10、66 Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat BarC478 Specification for Circular Precast Reinforced Concrete Manhole SectionsC822 Terminology Relating to Concrete Pipe and Related ProductsC913 Specification for Precast Concrete Water and Wastew
11、ater StructuresD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD543 Practices for Evaluating the Resistance of Plastics to Chemical ReagentsD573 Test Method for RubberD
12、eterioration in an Air OvenD624 Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ElastomersD883 Terminology Relating to PlasticsD1149 Test Methods for Rubber DeteriorationCracking in an Ozone Controlled Environment1 This specification is under the jurisdiction ofASTM
13、 Committee C13 on Concrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholes and Specials.Current edition approved July 1, 2013Sept. 1, 2018. Published July 2013October 2018. Originally approved in 1979. Last previous edition approved in 20082013 asC923 08.C923 08(2013)1. DOI:
14、 10.1520/C0923-08R13E01.10.1520/C0923-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not
15、 an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate
16、. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D1566 Terminology Relating to RubberD2137 Test Methods for Rubber Pr
17、opertyBrittleness Point of Flexible Polymers and Coated FabricsD2240 Test Method for Rubber PropertyDurometer HardnessNOTE 2For more information about wastewater structures, see Specification C913.3. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber shall be as defined in Termin
18、ologies D883 and D1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, and related products shall be as defined in Terminology C822 and asmodified in 3.1.3 3.1.6.3.1.3 connectorthe entire assembly including resilient seals and metallic or nonmetallic mechanical devices, if any
19、, usedtherein.3.1.4 lateralthe small diameter pipe connected to the main line pipe.3.1.5 pipethe inlet or outlet pipe connected to the manhole.3.1.6 pipe stuba short section of pipe, installed in the structure as an inlet or outlet pipe, for future connection.4. Materials and Manufacture4.1 All mate
20、rials shall conform to the following requirements:4.1.1 Resilient materials for connectors and filler rings shall be manufactured from natural or synthetic rubber and shall conformto the requirements prescribed in Table 1. If a splice is used in the manufacture of the seal, its strength shall be suc
21、h that the sealshall withstand a 180 bend with no visible separation.4.2 Mechanical DevicesExpansion rings, tension bands, and take-up devices used for mechanically compressing the resilientportion of the connector against the pipe, manhole or wastewater structurestructure; shall be made from a mate
22、rial or materials incombination that will ensure durability, strength, resistance to corrosion, and have properties that will ensure continued resistanceto leakage.All metallic mechanical devices, including castings and bolt assemblies used to mechanically deform resilient materialsshall be construc
23、ted of corrosion resistant materials meeting the physical properties and chemical composition requirements ofSpecifications A493 and A666, Type 302 through Type 316.NOTE 3Experience has shown that successful performance of this product depends on the type of bedding and backfill and the care in the
24、fieldinstallation of the manhole or wastewater structure and connecting pipes. 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 positive seal is accomplished at two locations: (1) between the connector and
25、the wall of the manhole or wastewater structure and (2) between the connector and the pipe. The seal between the connector andthe wall of the manhole or wastewater structure shall be made by either mechanical means, compression of the resilient materialbetween the outside surface of the pipe and the
26、 pipe opening in the wall of the manhole or wastewater structure, or by casting theconnector integrally with the wall of the manhole or wastewater structure. The seal between the connector and the pipe shall bemade by mechanical means or by compression of the resilient material against the outside o
27、f the pipe. Resilient filler rings are notTABLE 1 Resilient Material TestsTest Test RequirementsA ASTM 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 %, minHardnessB 5
28、 from the connector manufacturers specified hard-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
29、22 hWater absorption increase of 10 %, max, of original by weight D471, immerse 0.75 by 2 in. specimen indistilled water at 70C for 48 hWater absorption increase of 10 %, max, of original by weight D471, immerse 1 by 2-in. specimen indistilled water at 70C for 48 hOzone resistance rating 0 D1149Low-
30、temperature brittle point no fracture at 40C D2137Tear resistance 200 lbf/in. D624, Die BA Specimens shall be prepared from connector specimens, and shall not be prepared from laboratory slabs or by direct molding.B The connector manufacturer shall select the hardness appropriate for each component
31、of the connector. Thereafter, the hardness shall comply within the tolerances inTable 1.C923 182prohibited from being used between the pipe and the connector to provide a seal. Whichever design is used, it shall be capableof maintaining a resilient, hydrostatic seal under the performance conditions
32、in accordance with Section 7. Devices used to effectmechanical seals shall conform to the requirements specified in Section 4.5.2 For lateral to pipe connectors, the design of the connector shall be such that a positive seal is accomplished at two locations:(1) between the connector and the pipe wal
33、l and (2) between the connector and the lateral. The seal between the connector andthe pipe wall shall be made by either mechanical means, compression, or by casting the connector integrally with the pipe wall.The seal between the connector and the lateral shall be made by either mechanical means or
34、 by compression of the resilientmaterial against the outside of the pipe. Resilient filler rings are not prohibited from being used between the lateral and theconnector to provide a seal. Connector design must not allow either lateral or connector to extend past the cylindrical plane of thepipe insi
35、de diameter. The connector shall be capable of maintaining a resilient hydrostatic seal under the performance conditionsin accordance with Section 7. Devices used to effect mechanical seals shall conform to the requirements specified in Section 4.5.3 Purchaser shall require that all pipe stubs insta
36、lled, to allow for future connection to the manhole or wastewater structure,be mechanically restrained from movement by means other than, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 36 in. and smaller, at least one connector shall be tested for each 6 in. incr
37、ement in diameter. For diameterslarger than 36 in., at least one connector shall be tested for each 12 in. increment in diameter.6.2 The acceptability of the resilient connector shall be determined by the results of the physical tests prescribed in thisspecification, if and where required, and by in
38、spection, to determine whether the connector conforms to the specification withregards to design and freedom from defects.6.3 When requested, a current certification shall be furnished as the basis of acceptance. The certification shall consist of theconnector manufacturers test report, or statement
39、 by the manufacturer, accompanied by a copy of the test results, that the resilientconnector has been tested and inspected in accordance with the provisions of Section 4 and Section 7. Each certification sofurnished shall be signed by the connector manufacturer or an authorized agent.NOTE 4Certifica
40、tion shall be deemed current, if it represents present design, and bears a date that is no more than five years older than the currentdate.7. Test Methods and Requirements7.1 Install a pipe(s) and the resilient connector(s) to be tested in the base section of a manhole or wastewater structure. Subje
41、ctthe assembly to the prescribed hydrostatic pressure in 7.2 at the centerline of the connector for a period of 10 min for each testcondition. Restrain the pipe against axial movement during the tests.NOTE 5The user of this specification is advised that if manhole bases greater than 48 in. inside di
42、ameter are required to accommodate large diameterconnectors for the test, all safety requirements and procedures should be reviewed prior to the test.7.1.1 Install a lateral and resilient connector to be tested into the pipe. Subject the assembly to the prescribed hydrostaticpressure in 7.2 at the c
43、enterline of the connector for a period of 10 min for each test condition. Restrain the lateral against axialmovement during the tests.7.2 There shall be no leakage under any of the following conditions:7.2.1 Straight alignment of the pipe(s)/lateral(s) subjected to a hydrostatic pressure of 13 psi
44、(30 ft) for 10 min.7.2.2 Axial deflection of the pipe(s)/lateral(s). Upon completion of the test for straight alignment in 7.2.1 the pipe(s)/lateral(s)shall be axially deflected at least 7 in any direction and subjected to a hydrostatic pressure of 10 psi (23 ft.) for 10 min.7.2.3 When the pipe is l
45、oaded in shear in accordance with the requirements shown in Fig. 1 and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.FIG. 1 Shear Test RequirementsC923 1837.2.4 When the lateral is loaded in shear in accordance with the loading requirements of Fig. 1 and does not exceed 1 in. ofax
46、ial movement at the connector and subjected to a hydrostatic pressure of 10 psi (23 ft.) for 10 min.7.2.5 Note: Pressure is not prohibited from being relieved while deflecting or loading test section.7.3 Leakage shall be construed to mean freely dripping water emanating at the interface between the
47、connector and base of themanhole or wastewater structure, or the pipe; between the connector and the filler rings; or through the body of the connector andthe filler rings; or through the body of the connector itself.7.4 Moisture appearing at random locations on the base of the outlet in the form of
48、 patches or beads adhering to the surfacesshall not be considered leakage.7.5 A delay of up to 24 h is not prohibited prior to making observations of leakage.8. Product Marking8.1 Each connector shall be marked legibly by the connector manufacturer with his trade name and the size designation or par
49、tnumber.9. Keywords9.1 definitions; design test method; marking; material requirements acceptance criteria; product marking; resilient connectorASTM 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 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 responsib
