Ⅰ. Bridge (2007) 8360-KTPZ, 8360-TPZB(X) series of bridge pot bearing's specification
| 1. |
① bridge (2007) 8360-KTPZ bearings |
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Simple box girder bridge bearings have 9 grades in terms of capacity of reaction force (vertical load): 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000 and 7000KN;
Multi-spam continuous girder bridge bearings have 22 grades in terms of capacity of reaction force (vertical load): 4000, 4500, 5000, 5500, 6000, , 7000, 8000, 9000, 10000, 12500, 15000, 17500, 20000, 22500, 25000, 27500, 30000, 32500, 35000, 37500, 40000, and 45000KN; Simple T girder bridge bearings have 5 grades in terms of capacity of reaction force (vertical load): 1000, 1500, 2000, 2500, and 3000KN; |
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② bridge (2007) 8160-TPZB(X) bearings |
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Standard girder bridge bearings have 5 grades in terms of capacity of reaction force (vertical load): 1000, 1500, 2000, 2500, and 3000KN; Multi-spam continuous girder bridge bearings have 21 grades in terms of capacity of reaction force (vertical load): 3500, 4000, 4500, 5000, 5500, 6000, 7000, 8000, 9000, 10000, 12500, 15000, 17500, 20000, 22500, 25000, 27500, 30000, 35000, 37500, 40000, and 45000KN; |
| 2. |
Design turning angle: 0.02rad |
| 3. |
Horizontal load of bridge bearings |
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(DX) Multi-way movable bearings withstands 5% of the design reaction force |
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? bridge (2007) 8360-KTPZ bearings:
Under vertical load, horizontal design force of every direction of fixed bearing, vertical movable bearing in cross-bridge direction and horizontal movable bearing in bridge axial direction:
15%---- region's ground motion peak acceleration Ag ≤ 0.1g
20%----region's ground motion peak acceleration 0.1 ＜ Ag ≤ 0.15g
30%----region's ground motion peak acceleration 0.15 ＜ Ag ≤ 0.2g |
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? bridge (2007) 8160-TPZB(X) bearings:
Under vertical load, horizontal design force of every direction of fixed bearing, vertical movable bearing in cross-bridge direction and horizontal movable bearing in bridge axial direction:
15%---- region's ground motion peak acceleration Ag ≤ 0.1g
20%----region's ground motion peak acceleration 0.1 ＜ Ag ≤ 0.15g
30%----region's ground motion peak acceleration 0.15 ＜ Ag ≤ 0.2g
40%----region's ground motion peak acceleration 0.2 ＜ Ag ≤ 0.3g |
| 4. |
Design displacement of bearings |
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① bridge (2007) 8360-KTPZ bearings:
Multi-way movable bearings and vertical movable bearing in bridge axial direction :
Simple box girder bridge bearings
1000~1500 ± 30mm
2000~3000 ± 50mm
3500~7000 ± 60mm
Multi-spam continuous girder bridge bearings
3500~4500 ± 100mm
Notes: when the required movement factor is different from the factor mentioned above, the bridge bearing can be made specially.
Multi-way movable bearings and horizontal movable bearing in cross- bridge direction :
± 10mm |
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② Bridge (2007) 8160-TPZB(X) bearings:
Multi-way movable bearings and vertical movable bearing in bridge axial direction :
Standard girder bridge bearings:
TBZB 1000~3000 ± 30mm
Simple supported girder bridge bearings:
TBZX3500~4500 ± 50mm ± 100mm ± 150mm ± 200mm
Multi-way movable bearings and horizontal movable bearing in cross- bridge direction :
± 10mm |
| 5, |
Movable bearing's design friction coefficient : |
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Normal temperature : 0.03
Cold resistant: 0.05 |
| 6. |
Temperature scope of application |
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Normal temperature (natural rubber): -25 ~ + 60 ℃
Cold resistant (natural rubber or ethylene propylene diene monomer ): - 40 ~ + 60 ℃ |
| 7. |
Scope of track gradient : 0 ~ 20 ‰ |
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? Simple beam bridge bearings adopt changing the top surface of top plate to fit the requirement of gradient:
0≤ i ≤4 ‰, no gradient.
4 ‰ ＜ i ≤12 ‰ gradient: 8 ‰
12 ‰ ＜ i ≤20 ‰ gradient: 16 ‰
20 ‰ ＜ i no gradient, adopting adjusting mudsill
cast in place simple beam bridge bearings and multi-spam continuous beam bridge bearings: no gradient on the top surface of top plate, adopt adjusting the concrete of mudsill. |
Ⅱ. Bridge (2007) 8360-KTPZ, (2007) 8160-TPZB(X) bridge bearing's design allowable stress of main material
Confined rubber plate: 25MPa
PTFE plate's design allowable stress (average): 30MPa
ZG270-500 Cast Steel's design allowable bending stress: 150MPa
Allowable shearing stress: 90MPa
SF-1 three-ply cladding sheet: 65MPa
40 Cr anchor bolt allowable shearing stress: 280MPa
Ⅲ. Bridge (2007) 8360-KTPZ, (2007) 8160-TPZB(X) Bridge pot bearing's requirements of materials
1. Metal material (attach material specification)
Plain carbon structural steel meets the requirement of GB700; 45# high quality carbon structural steel meets the requirement of GB/T699; 40Cr steel's performance satisfies the requirement of 《 Alloy Structural Steel -GB/T3077 》 .
Cast steel meets the requirement- GB/T11352 of 《 General Engineering Casting Carbon Steel Parts 》 . Stomata, slag inclusion and crack of cast steel meet the requirement- TB/T2331 of 《 Railway Bridge Pot Bearing 》 , Processed forgings are carrying with ultrasonic inspection . The result needs to meet the Grade I of 《 Cast Steel Parts' Ultrasonic Inspection and Quality Estimation Methods-GB-7233 》
1Cr18Ni9Ti Stainless steel meets the requirement-GB3280 of 《 cold rolled stainless steel plates 》 .
H62 brass meets the requirement- GB2040 of 《 copper and copper alloy plate 》
2. Nonmetallic material
? Physical and Mechanical properties of Elastomeric Bearings:
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item |
Rubber Bearing Plate |
Rubber Seal Ring |
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chloroprene rubber |
Natural Rubber |
EPDM |
chloroprene rubber |
EPDM |
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Hardness (IRHD) |
60±5 |
60±5 |
60±5 |
50±5 |
50±5 |
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Tensile strength (MPa) |
≥ 17.5 |
≥ 17.5 |
≥ 15.2 |
≥ 14.5 |
≥ 12.0 |
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Elongation at break (%) |
≥ 400 |
≥ 400 |
≥ 350 |
≥ 400 |
≥ 350 |
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Brittleness temperature ( ℃ ) |
≤ -40 |
≤ -55 |
≤ -60 |
≤ -40 |
≤ -60 |
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Permanente deformation by Constant compression ( 70 ℃ *22h)% |
≤ 25 |
≤ 30 |
≤ 25 |
≤ 25 |
≤ 25 |
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Hot air aging experiment |
Experimental condition ( ℃ *h) |
100*70 |
168*70 |
100*70 |
100*70 |
100*70 |
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Hardness change (IRHD) |
≤ +10 |
≤± 10 |
≤ +10 |
≤ +10 |
≤ +10 |
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Tensile strength reduction rate (%) |
≤ 15 |
≤ 15 |
≤ 15 |
≤ 15 |
≤ 15 |
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Elongation reduction rate at break (%) |
≤ 40 |
≤ 20 |
≤ 40 |
≤ 40 |
≤ 40 |
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Ozone aging ( 40 ℃ *96h, 25pphm, 30% elongation ) |
100 pphm |
25
pphm |
100 pphm |
100 pphm |
100 pphm |
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Crack-free |
Crack-free |
Crack-free |
Crack-free |
Crack-free |
Notes: anatomy performance of rubber compound for bearing:
Hardness meets the requirement in the above table.
Tensile strength reduction rate is less than 20%.
Elongation reduction rate at break is less than 35%.
? PTFE plate is molded of fresh pure material. Average particle of raw material is less than 50μm. Molding pressure depends on the raw material; molding pressure of normal raw material is more than 25MPa.
Physical and Mechanical properties of PTFE plate
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Item |
Test measure |
Specification |
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Density |
GB/T 1033 |
2.14~ 2.20 g /cm3 |
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Tensile strength |
GB/T 1040 |
≥ 30MPa |
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Elongation at break |
GB/T 1040 |
≥300% |
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Ball indentation hardness |
GB/T 3398 |
H132/60=23~33MPa |
Notes: Ball indentation hardness H132/60 (load 132N, sustained load 60s)
? Compressive stress σ = 30MPa, speed V= 0.4mm /s. when PTFE plate frictionates with stainless steel plate within silicone grease lubrication ( Normal temperature: 23 ± 5 ℃ ), initial static friction coefficient : μst ≤ 0.012
compressive stress σ = 30MPa, speed V= 8mm /s, reciprocating distance s = ± 10mm , cumulative attrition distance ∑ S ≥ 1000m , when PTFE plate frictionates with stainless steel plate within silicone grease lubrication (Normal temperature: 23 ± 5 ℃ ), line attrition loss: ≤ 15 μm/km
② PTFE plate sticks with substrate steel plate, adhesive is insoluble and thermosetting, as well as, peeling strength is more than 5N/mm.
③ PTFE plate's size deviation and appearance quality meet No. 4.4.2 a nd 4.5.2 requirement of 《 Railway Bridge Pot Bearing -TB/T2331 》
? SF-1 three-ply cladding sheet is made from bronze, bronze powder and UHMW-PE by sintering. The thickness of substrate bronze plate is 2.0± 1.15mm ; the thickness of interlayer sintered from bronze powder is 0.25± 8.5mm ; surface is sintered from 20% plumbum and 80% Polytetrafluoroethylene , its thickness is 0.01± 8.02mm ; the thickness of composite plate is 2.4± 8.1mm .
SF-1 three-ply cladding sheet needs to be folded repeatedly. Folding angle is ±60°, there is no delamination . Physical and mechanical properties of SF-1 meet the requirement of TB/T2331.
? Physical and mechanical properties of 5021 superior silicone grease lubrication meet the requirement of HG/T2505.
Ⅳ . Bridge (2007) 8360-KTPZ, (2007) 8160-TPZB(X) bearing making and quality control
1 cast steel parts
Heat treatment of cast steel parts meets the requirement of No. 5.2.2 in TB/T1853-1995 《 Railway Bridge Cast Steel Bearing 》
After removing sand from cast steel parts, the dimensional and shape inspection should meet the requirement of GB/T6414-1999 《 Casting Dimensional Tolerance and Process Redundancy 》 . After casting defect repair welding, the quality needs to meet No. 4.5.3 .2 of TB/T2331-2004 《 Railway Bridge Pot Bearing 》
Chemical constitution of casting needs to do inspection each furnace, also, certificate of chemical constitution analyses and mechanical property (including impact toughness) are provided. Inspection measure adopts testing rod within furnace and does repetition measurement of testing rod.
2 After bearing making, dimensional precision and surface roughness is accordant with the design drawing:
Notes: dimension deviation of no-described parts is accordant with the grade M of GB/T1804-2000.
3 Stainless steel cold rolling plate and substrate sheet adopt argon arc welding. Flatness of stainless steel is accordant with design drawing.
4 Anticorrosion and dustproof of bearings meet the requirements of 《 provisional specification of passenger dedicated bridge pot bearing 》 and design drawing.
Ⅴ . Bridge (2007) 8360-KTPZ, (2007) 8160-TPZB(X) Bridge Bearing's Assembly
1 Each part of bearing has kite mark from department of quality determination, purchased parts attach certificate of soundness, as well as, its main specification has rechecked report.
2 Bearing sliding surface (stainless steel surface and PTFE surface) utilizes acetone or alcohol to clean up. Check arrangement of silicone grease groove. Silicone grease fully stores groove of PTFE surface without stomata.
3 Before assembly, clean up bearing pot inner and smear silicone grease. During assembly, using round mallet to hammer lightly attach the two closely without air interlayer.
4 After assembly, the gap between vertical and horizontal bearings' lateral channel and top guide plate of medium steel lining can be controlled in 0. 6 ± 0.1 mm . after assembly of fixed bearing, the gap between bearing pad and plug is controlled in 0.5 ± 0.1 mm
5 After assembly, non-parallelism of bearing upper plane and under plane is less than diameter or 2‰ of length edge.
Vertical load ＜ 20000KN, error ≤ ± 2mm
Vertical load ≥ 20000KN, error ≤ ± 3mm
Ⅵ . Quality control of bearing
Quality control of bearing is divided into 3 classes- material inspection, factory inspection and modal examination. The item and period of inspection meet the requirement-No. 5.1, 5.2, 5.3 of 《 provisional specification's supplementary provision of passenger dedicated bridge pot bearing 》 ; The result of inspection meets the requirement-No. 5.3 of 《 provisional specification of passenger dedicated bridge pot bearing 》
Ⅶ . Mark, package, storage, transportation, handover of bearing meet the requirement- No. 6 of 《 provisional specification of passenger dedicated bridge pot bearing 》
