Standard No.:	JT/T 4-2004
English Name:	Plate Type Elastomeric Pad Bearings for Highway Bridges
Chinese Name:	公路桥梁板式橡胶支座
Chinese Classification:	P28    Bridge and culvert engineering
Professional Classification:	JT    Professional Standard - Transport
Issued by:	MOT
Issued on:	2004-03-17
Implemented on:	2004-6-1
Status:	superseded
Superseded by:	JT/T 4-2019 Laminated bearing for highway bridge
Superseded on:	2019-9-1
Superseding:	JT/T 4-1993 Plate Type Elastomeric Pad Bearings for Highway Bridges JT 3132.3-1990 Rule for Mechanical Performance Inspection of Elastomeric Bearings for Highway Bridges
Language:	English
File Format:	PDF
Word Count:	10000 words
Price(USD):	250.0
Delivery:	via email in 1 business day

Plate Type Elastomeric Pad Bearings for Highway Bridges 1 Scope This standard specifies the requirements of classification, technical requirements, test methods, test rules, marking, packaging, storage, transportation, installation and curing for plate type elastomeric pad bearings for highway bridges. This standard is applicable to rectangular and circular plate type elastomeric pad bearings for highway bridges. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this standard. GB/T 528 Rubber, vulcanized or thermoplastic-Determination of tensile stress-strain properties (eqv ISO 37: 1994) GB/T 912 Hot-rolled plain carbon and low alloy structural steel sheets and strips GB/T 1682 Rubber, vulcanized--Determination of low-temperature brittleness (single test piece method) (eqv ISO812: 1991) GB/T 3280 Cold rolled stainless steel plate sheet GB/T 3512 Rubber, vulcanized or thermoplastic--Accelerated ageing and heat resistance tests--Air-oven method (eqv ISO188: 1998) GB/T 6031 Rubber, Vulcanized or thermoplastic--Determination of hardness (hardness between 10 IRHD and 100IRHD) (idt ISO48: 1994) GB/T 7759 Rubber, Vulcanized or thermoplastic-Determination of compression set at ambient, elevated or low temperatures (eqv ISO815: 1991) GB/T 7760 Rubber, Vulcanized--Determination of adhesion to metal--One-plate method (eqv ISO813: 1986) GB/T 7762 Rubber vulcanized--To zone ageing--Static strain test method (neq ISO1431/1: 1989) GJB 3026 Specification for large-scale PTFE plates HG/T 2198 Rubber vulcanized--The general requirements for the physical test method HG/T 2502 5201 silicone grease JT 3 91 Pot-type elastomeric pad bearing for highway bridge JJG 175 Verification Regulation of Tension, Compression and Universal Testing Machine for Nonmetallic JT GD62 Design specification of highway reinforced concrete and prestressed concrete bridges and culverts 3 Classification and Code of Product 3.1 Product Classification 3.1.1 According to the structural type, it can be classified into: a) Ordinary plate type elastomeric pad bearings: rectangular plate type elastomeric pad bearing (code name GJZ), circular plate type elastomeric pad bearing (code name GYZ); b) PTFE sliding-plate type elastomeric pad bearings: rectangular PTFE sliding-plate type elastomeric pad bearing (code name GJZF4) , circular PTFE sliding-plate type elastomeric pad bearing (code name GYZF4) . 3.1.2 According to the material and application temperature for bearings, it can be classified into: a) Chloroprene rubber (CR) shall be adopted for ambient-temperature type elastomeric pad bearings, and the application temperature shall be -25℃-600℃. Natural rubber shall not be used in place of chloroprene rubber and also it shall not be mixed into the chloroprene rubber; b) Natural rubber (NR) shall be adopted for cold-resistant type elastomeric pad bearings, and the application temperature shall be -40℃-60℃. 3.2 Product Code Representation method: Classification of rubber: chloroprene rubber (CR) is adopted for ambient-temperature type bearings; natural rubber (NR) is adopted for cold-resistant bearings. Dimension: Rectangular type: la× lb× t (mm); Circular type: d× t(mm). Type code: F4 refers to PTFE sliding-plate bearings; while those un-code-names refer to ordinary bearings. Name code: GJZ refers to rectangular bearings for highway bridges; GYZ refers to circular bearings for highway bridges. Illustration1: A rectangular ordinary chloroprene rubber bearing for highway bridge whose shorter side is 300mm, longer side is 400mn and thickness is 47mm can be expressed as GJZ300×400×47 (CR) . Illustration 2: a circular PTFE sliding-plate type natural rubber bearing for highway bridge whose diameter is 300mn and thickness is 54mn can be expressed as: GYZF4300×54 (NR) . 3.3 Bearing Structure 3.3.1 Ordinary plate type elastomeric pad bearing Ordinary plate type elastomeric pad bearings shall be made of at least two stiffening steel plates which are wholly wrapped in elastic rubber material, its structure is shown in Figure 1 and Figure 2 respectively. Figure 1 Ordinary Rectangular Plate Type Elastomeric Pad Bearing Figure 2 Ordinary Circular Plate Type Elastomeric Pad Bearing 3.3.2 PTFE sliding-plate elastomeric pad bearing PTFE sliding-plate elastomeric pad bearing is made by bonding a PTFE plate of certain thickness on the top surface of the ordinary plate type elastomeric pad bearing, its structure is shown in Figure 3 and Figure 4 respectively. Figure 3 Rectangular PTFE Sliding-plate Elastomeric Pad Bearing

Foreword II 1 Scope 2 Normative References 3 Classification and Code of Product 4 Technical Specifications 5 Test Methods 6 Test Rules 7 Mark, Packaging, Storage and Transportation 8 Installation and Curing Appendix A(Normative Appendix) Test methods for mechanical properties of plate type elastomeric pad bearings for highway bridges