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JT/T 4-2019: Laminated bearing for highway bridge
Status: Valid JT/T 4: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JT/T 4-2019 | English | 1289 |
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9 days [Need to translate]
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Laminated bearing for highway bridge
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JT/T 4-2019
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| JT/T 4-2004 | English | 959 |
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Plate type elastomeric pad bearings for highway bridges
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JT/T 4-2004
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| JT/T 4-1993 | English | RFQ |
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Plate Type Elastomeric Pad Bearings for Highway Bridges
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JT/T 4-1993
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PDF similar to JT/T 4-2019
Basic data | Standard ID | JT/T 4-2019 (JT/T4-2019) | | Description (Translated English) | Laminated bearing for highway bridge | | Sector / Industry | Highway & Transportation Industry Standard (Recommended) | | Classification of Chinese Standard | P28 | | Classification of International Standard | 93.040 | | Word Count Estimation | 56,521 | | Date of Issue | 2019 | | Date of Implementation | 2019-09-01 | | Issuing agency(ies) | Ministry of Transport | | Summary | This standard specifies the product classification, structure and model, technical requirements, test methods, inspection rules, as well as requirements for marking, packaging, transportation and storage of slab rubber bearings for highway bridges. This standard applies to the production, inspection and use of slab rubber bearings for highway bridges with a bearing capacity of less than 5000kN | JT/T 4-2019: Laminated bearing for highway bridge---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Road bridge plate rubber bearing)
Contents
Foreword Ⅱ
1 Scope 1
2 Normative references 1
3 Terms, definitions and symbols 1
4 Classification, structure, specifications and models 3
5 Technical requirements 6
6 Test method 10
7 Inspection rules 11
8 Marking, packaging, transportation and storage 12
Appendix A (Normative) Test Method for Mechanical Properties of Highway Bridge Slab Rubber Bearings 14
Appendix B (Normative Appendix) Specification for Highway Bridge Plate Rubber Bearings Series 20
JT/T 4-2019
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009
This standard replaces JT/T 4-2004 «Highway bridge plate rubber bearings» and JT/T 663-2006 «Highway bridge plate rubber bearings specifications
Grid series »This standard is based on JT/T 4-2004« Highway Bridge Plate Rubber Bearings »-integrated JT/T 663-2006« Highway Bridges
Plate rubber bearing specification series »Contents-Compared with JT/T 4-2004-The main technical changes are as follows.
--- Added terms, definitions and symbols (see Chapter 3)
--- Modified the structural requirements for the rubber support of the skateboard (see 4.2.2-3.2 of the.2004 version)
--- Modified the method of plate rubber bearing model expression (see 3.2 in the.2003-2004 version)
--- Increased the rubber content of the support rubber and the requirement that no recycled rubber or crushed vulcanized rubber should be used (see 5.1.1)
--- Increased the requirements for the design service life of the bearing (see 5.1.2)
--- Modified stainless steel plate grades and processing requirements (see 5.3.3.4.1-4.4 of the.2004 version)
--- Increased the material requirements of the upper and lower steel plates of the support (see 5.3.4)
--- Increased requirements for anchor bolt materials (see 5.3.5)
--- Added requirements for modified PTFE skateboard materials (see 5.3.6.1)
--- Increased dust cover requirements (see 5.3.9)
--- Modified the requirements for the shear modulus of the bearing after the aging measurement (see Table 7-Table 1 of the.2004 edition)
--- Increased the requirement for shear bond performance of the support (see Table 7)
--- Increased the requirements for the performance test of the support slide material (see 6.2.2)
--- Modified the sampling position requirements of the support anatomy test rubber (see 6.5.1-5.7 of the.2004 edition)
--- Increased the requirements for support product specifications (see 8.2.4)
--- Modified the standard temperature of the laboratory (see A.2.1-2004 version A.2.1)
--- Modified the requirements for testing equipment (see A.3.4-2004 version of A.3.3)
This standard was proposed and managed by the National Transportation Engineering Facilities (Highway) Standardization Technical Committee (SAC/TC 223)
This standard was drafted. China Communications Highway Planning and Design Institute Co., Ltd., China Communications Highway Long Bridge Construction National Engineering Research Center Co., Ltd.
Division, Chengdu Xinzhu Road and Bridge Machinery Co., Ltd., Zhejiang Qinshan Rubber Engineering Co., Ltd., Shanghai Pengpu Rubber Products Co., Ltd.,
Chengdu Datongqiao Machinery Co., Ltd., Hebei Baoli Engineering Equipment Co., Ltd., Shenzhou Engineering Plastic Co., Ltd., Hengshui Iron
Construction Engineering Rubber Co., Ltd., Liuzhou Dongfang Engineering Rubber Products Co., Ltd., Jiangsu Yangzhou Heli Rubber Products Co., Ltd., Zhonglu Gao
Branch Traffic Inspection and Certification Co., Ltd.
The main drafters of this standard. Feng Yi, Liu Xiaodi, Li Wenjie, You Yitao, Wang Jianfen, Wu Dexing, Wu Datong, Wang Xihui, Du Wenming,
Jia Leilei, Zi Daoming, Chen Xinyi, Su Jian
The previous versions of the standards replaced by this standard are.
--- JT/T 3132.1-88, JT/T 3132.28-88, JT/T 3132.30-90
--- JT/T 4-1993, JT/T 4-2004
--- JT/T 663-2006
JT/T 4-2019
Highway bridge plate rubber bearing
1 Scope
This standard specifies the product classification, structure and model, technical requirements, test methods, and inspection rules for highway bridge plate rubber bearings.
And marking, packaging, transportation and storage requirements
This standard applies to the production, inspection and use of plate rubber bearings for highway bridges with a bearing capacity of less than 5,000 kN.
2 Normative references
The following documents are indispensable for the application of this document.
All undated references-the latest version (including all amendments) applies to this document
GB/T 528 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber
GB/T 699 high-quality carbon structural steel
GB/T 700 carbon structural steel
GB/T 3077 alloy structural steel
GB/T 3274 Hot rolled steel plate and strip of carbon structural steel and low alloy structural steel
GB/T 1682 Determination of low temperature brittleness of vulcanized rubber-Single specimen method
GB/T 3280 stainless steel cold-rolled steel plate and strip
GB/T 3512 Vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test
GB/T 6031 Determination of hardness of vulcanized rubber or thermoplastic rubber (10 IRHD ~ 100 IRHD)
GB/T 7759.1 Determination of compression set of vulcanized or thermoplastic rubber. Part 1. Under normal and high temperature conditions
GB/T 1111 Determination of adhesion strength between vulcanized rubber or thermoplastic rubber and metal two plate method
GB/T 7762 Vulcanized rubber or thermoplastic rubber resistance to ozone cracking static tensile test
General requirements for physical test methods of HG/T 2198 vulcanizate
HG/T 2502 5201 Silicone grease
JB/T 5943 General technical conditions for welding of construction machinery
JJG 139 Tension, pressure and universal testing machine verification procedures
JT/T 901 High polymer slide for bridge support
3 Terms, definitions and symbols
3.1 Terms and definitions
The following terms and definitions apply to this document
3.1.1.1
Plate rubber bearings laminated bearings
Composed of two or more layers of stiffened steel plate and rubber-and the steel plate should be completely enclosed in a support formed by the rubber body
3.1.2
Skate rubber bearing
Plate rubber support, sliding plate (bonded with plate rubber support through heat curing), mirror stainless steel plate, upper and lower steel plates, anchor bolts, etc.
JT/T 4-2019
Composition-support capable of adapting to beam displacement
3.1.3
Shape factor sharp coefficient
Ratio of the effective bearing area of a single rubber layer to its free side surface area in a plate rubber bearing of a highway bridge
3.1.4
Effective size sieve
Side length (or diameter) of stiffened steel plate inside plate rubber bearing of highway bridge
3.1.5
Modified polytetrafluoroethylene skateboard MZPTFE sheet
A skateboard made by molding and sintering after adding nano-level filler and polytetrafluoroethylene fully mixed-with excellent friction and wear
performance
3.2 Symbol
The following symbols apply to this document
A0 --- effective area-the plane area corresponding to the effective size of the support-the unit is square millimeter (mm2)
a1 --- The upper and lower steel plates of the skateboard rubber support are dimensioned in the bridge direction-the unit is millimeter (mm)
a2 --- The distance between the anchor bolts of the skateboard rubber support and the bridge direction is in millimeters (mm)
b1 --- Dimensions of the upper and lower steel plate transverse bridges of the skateboard rubber support-Unit is millimeter (mm)
b2 --- Horizontal distance between anchor bolts of skateboard rubber bearing and anchor bridge-unit is millimeter (mm)
d --- diameter of circular support-unit is millimeter (mm)
d0 --- Diameter of stiffened steel plate with round bearing-unit is millimeter (mm)
E --- compressive elastic modulus of bearing-unit is Megapascal (MPa)
Eb --- bulk modulus of bearing rubber elastomer-unit is Megapascal (MPa)
E1 --- Measured compressive elastic modulus of the bearing unit-Megapascal (MPa)
G --- Shear Modulus of Support-Unit is Megapascal (MPa)
G1 --- Measured Shear Modulus of Elasticity of Support-Unit. Megapascal (MPa)
G2 --- Measured Shear Modulus of Elasticity of Bearing after Aging-Unit. Megapascal (MPa)
h --- Total height of the assembly of the skateboard rubber bearing-Unit is millimeter (mm)
la --- the size of the short side of the rectangular support-unit is millimeter (mm)
lb --- long side dimension of rectangular support-unit is millimeter (mm)
l0a --- Rectangular support stiffened steel plate short-side dimensions-unit is millimeter (mm)
10b --- rectangular support stiffened steel plate long side dimensions-unit is millimeter (mm)
Δl1 --- maximum displacement without braking force-unit is millimeter (mm)
Δl2 --- the maximum displacement when the braking force is counted-the unit is millimeter (mm)
Δl3 --- Displacement of the slide bearing along the bridge-unit is millimeter (mm)
Δl4 --- the amount of lateral displacement of the sliding bridge support-unit is millimeter (mm)
Ra --- Surface roughness of stainless steel plate-unit is micrometer (μm)
Rk --- Maximum bearing pressure of bearing-Unit is thousand Newton (kN)
RGk --- Minimum bearing resistance against sliding
S --- shape factor of bearing
t --- total thickness of the support-unit is millimeter (mm)
te --- total thickness of rubber layer-unit is millimeter (mm)
tf --- skateboard thickness-unit is millimeter (mm)
JT/T 4-2019
t0 --- thickness of single layer steel plate-unit is millimeter (mm)
t1 --- thickness of middle single layer rubber-unit is millimeter (mm)
tanθ --- allowable angle of tangent
4 Classification, structure, specifications and models
4.1 Classification
4.1.1 Plate rubber bearings for highway bridges (hereinafter referred to as "supports") are divided into structural forms.
a) Ordinary plate rubber bearings.
1) Rectangular Plate Rubber Bearing-Code J
2) Round Plate Rubber Bearing-Code Ｙ
b) Skateboard rubber bearings.
1) Rectangular Skateboard Rubber Bearing-Code JH
２) Round slide rubber bearing-code ZH
4.1.2 According to the applicable temperature of the support.
a) Normal temperature type rubber support-applicable temperature-25 ℃ ~ 60 ℃-produced by neoprene-code CR
b) Cold-resistant rubber bearings-applicable temperature-40 ℃ ~ 60 ℃-using natural rubber production-code NR
4.2 Structure
4.2.1 Ordinary plate rubber bearing
The structure of ordinary plate rubber bearings is shown in Figures 1 and 2.
Explanation.
1 --- Stiffened steel plate
2 --- rubber layer
Figure 1 Schematic structure of rectangular plate rubber support
JT/T 4-2019
Explanation.
1 --- Stiffened steel plate
2 --- rubber layer
Figure 2 Schematic structure of round plate rubber support
4.2.2 Skateboard rubber support
Skateboard rubber support structure is shown in Figures 3 and 4.
Explanation.
1 --- Upper steel plate 5 --- Dust cover
2 --- stainless steel plate 6 --- lower steel plate
3 --- Skateboard 7 --- Stone cushion
4 --- Embedded steel plate 8 --- Anchor bolt
Figure 3 Schematic diagram of the rectangular slide rubber bearing structure
JT/T 4-2019
Explanation.
1 --- Upper steel plate 5 --- Dust cover
2 --- stainless steel plate 6 --- lower steel plate
3 --- Skateboard 7 --- Stone cushion
4 --- Embedded steel plate 8 --- Anchor bolt
Figure 4 Schematic diagram of the rubber structure of the round skateboard
4.3 Model
The bearing model is shown in Figure 5.
Figure 5 Support model
Example 1.
Ordinary rectangular rubber bearings for highway bridges-normal temperature type-using neoprene-the plane size of the bearing is 300mm × 400mm-the total thickness of 47mm-expressed as.
Example 2.
Highway bridge circular skateboard rubber bearing-cold-resistant-using natural rubber-bearing diameter 300mm-total thickness 54mm-expressed as. GB ＺＹH300 × 54
(NR)
4.4 Specifications
See Appendix B for support specifications
5 Technical requirements
5.1 General requirements
5.1.1 The minimum rubber content of the support should not be less than 55% of the rubber mass-no recycled rubber or crushed vulcanized rubber shall be used
5.1.2 The design service life of the support should not be less than 15 years under normal circumstances
5.2 Appearance
The appearance of the support should meet the requirements of Table 1.
Table 1 Appearance requirements
The total area should not exceed 0.1% of the plane area of the support-and each area
Should not be greater than 50mm2-the maximum depth should not exceed 2mm
Uneven
When the plane area of the support is less than 0.15m2-not more than two faces
When the product is greater than 0.15m2-there should be no more than four places and the height of each bump should not exceed
0.5mm-area should not exceed 6mm2
Cracks on all sides and exposed steel plates are not allowed
Blocking, chipping, and mechanical damage are not allowed
Cracking or peeling of the joint between the steel plate and the rubber is not allowed
The surface of the skateboard should be smooth and flat-there should be no cracks, bubbles, delamination and mechanical damage.
Allows scratches, bruises, and knocks
Flatness of bearing surface
a) Ordinary support. the surface unevenness should not be greater than the maximum length of the plane
0.4%
b) Skateboard support. the surface unevenness should not be greater than the maximum length of the skateboard plane
0.2% of degree
The misalignment between the slide and the support should not exceed 0.5 ‰ of the short side or diameter of the rubber support.
5.3 Materials
5.3.1 Rubber
5.3.1.1 The physical properties of rubber materials shall meet the requirements of Table 2.
Table 2 Requirements for physical properties of rubber materials
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