JT/T 391-2009Pot bearing for highway bridge (English PDF)

Foreword

This standard is in accordance with GB/T Draft the rules given in 1-2009.

This standard replaces JT/T 391-2009 "Highway Bridge Basin Bearings". Compared with JT/T 391-2009, in addition to editorial changes, the main the technical changes are as follows.

--- Increased the definition of high-performance skateboard materials and their performance index requirements (see 3.1.4 and 5.3.3);

--- Increased lateral movable bearings and shock-absorbing lateral movable bearings (see 4.1);

--- Added the method of indicating the horizontal bearing capacity model (see 4.3);

--- Increased the service life requirements of the basin support (see 5.1.1);

--- Increased the horizontal bearing capacity classification standards and test methods (see 5.1.3 and Appendix B);

--- Added technical requirements for the appearance of the support (see 5.2);

--- Removed vertical design bearing capacity 0. 4MN ~ 0. 8MN support classification (see 4.1.1 of the 2009 edition);

--- Increased the support classification of vertical design bearing capacity 65MN ~ 80MN (see 5.1.2);

--- Added technical requirements and test methods for raw materials such as anchors, sleeves, and screws (see 5.3.1 and 6.3.1);

--- Modify the appearance defects of the rubber sheet (see 5.4.2.2.2, 4.4.1 of the 2009 edition);

--- Deleted the polytetrafluoroethylene sheet material (see 4.2.2 of the 2009 edition);

--- Added anti-corrosion measures for anchor bolts and sleeves, and modified the requirements for anti-corrosion measures for steel parts (see 5.5.5)

--- Modified the inspection rules (see Chapter 7, Chapter 7 of the 2009 edition).

This standard is proposed and managed by the National Technical Committee for Traffic Engineering Facilities (Highway) Standardization (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, Jiangsu Wanbao Bridge Component Co., Ltd., Fengze Engineering Rubber Technology Development Co., Ltd., Shenzhou Engineering Plastic Co., Ltd., Tangshan Huayun Railway Transportation Equipment Co., Ltd., Jiangsu Runtong Engineering Equipment Co., Ltd., Heng Rubber Technology Co., Ltd., Changshu Bridge Tunnel Rubber Co., Ltd., Hengshui Rubber General Factory Co., Ltd., Hengshui Railway Construction Rubber Co., Ltd., Zhejiang Qinshan Rubber Engineering Co., Ltd.

Co., Ltd., Suzhou Hyde New Material Technology Co., Ltd., Shanghai Pengpu Rubber Products Co., Ltd., Hebei Baoli Engineering Equipment Co., Ltd.

Co., Ltd., Zhuzhou Times New Material Technology Co., Ltd., Chengdu Xinzhu Road and Bridge Machinery Co., Ltd., Chengdu Datongqiao Machinery Co., Ltd., Zhonglu Gaoke Traffic Inspection and Certification Co., Ltd.

1 Scope

This standard specifies the product classification, structural form, model, technical requirements, test methods, inspection rules of highway bridge basin bearings, and Marking, packaging, transportation and storage requirements.

This standard is applicable to the production, inspection, and use of basin bearings for highway bridges with a design bearing capacity of 1 MN to 80 MN.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For 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 1040. 3 Determination of tensile properties of plastics. Part 3. Test conditions for films and sheets GB/T 1184 Shape and position tolerances without tolerance values GB/T 1591 Low-alloy high-strength structural steel GB/T 1632. 3 Plastics using a capillary viscometer to determine the viscosity of dilute polymer solutions. Part 3. Polyethylene and polypropylene GB/T 1682 Determination of low temperature brittleness of vulcanized rubber-Single specimen method GB/T 1804 Tolerances for linear and angular dimensions without general tolerances GB/T 2040 Copper and copper alloy sheet GB/T 3077 alloy structural steel GB/T 3280 stainless steel cold-rolled steel plate and strip GB/T 3323 Radiographs of metal fusion welded joints GB/T 3398. 1 Determination of plastic hardness Part 1. Ball indentation method 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 to 100 IRHD) GB/T 7233. 1 Ultrasonic Testing of Steel Castings Part 1. General Purpose Steel Castings GB/T 7759. 1 Determination of permanent compression set of vulcanized rubber or thermoplastic rubber Part 1. Under normal and high temperature conditions GB/T 7762 Vulcanized rubber or thermoplastic rubber resistance to ozone cracking static tensile test GB/T 1145 Nondestructive Testing of Welds Ultrasonic Testing Technology, Test Grades and Evaluation GB/T 11352 Cast carbon steel parts for general engineering HG/T 2198 General requirements for physical test methods for vulcanized rubber HG/T 2502 5201 Silicone grease JB/T 5936 General technical requirements for machined parts of construction machinery JB/T 5943 General technical conditions for welding of construction machinery JT/T 722 Technical requirements for anticorrosive coating of steel structures for highway bridges JT/T 901 Polymer material slide for bridge support JT/T 391-2019

3 Terms, definitions and symbols

3.1 Terms and definitions the following terms and definitions apply to this document.

3. 1. 1

Pot bearing

The rubber plate sealed in the steel basin is used to bear the dead load and live load of the upper structure, and the load is transmitted to the support of the lower structure.

3. 1. 2

Useful life life

Under normal design, production, installation, operation and maintenance conditions, the number of years that the support can work normally.

3. 1. 3

Friction plate

Used for shock-absorbing bearings, steel plates with specified friction coefficient and energy consumption capacity.

3. 1. 4

High-performance skateboard slider slide Sliding elements with self-lubricating, abrasion resistance and physical and mechanical properties, usually refers to modified PTFE skateboards or high viscosity average molecular weight Modified ultra high molecular weight polyethylene skateboard processed from 9 million polyethylene raw materials.

3.2 Symbol

The following symbols apply to this document.

D --- diameter of rubber plate, unit is millimeter (mm);

D1 --- diameter of brass seal ring, unit is millimeter (mm);

M --- molecular weight, dimensionless;

d --- the diameter of the high-performance slide, the unit is millimeter (mm);

d1 --- Plane diameter of high-performance slide fat storage pit, unit is millimeter (mm);

d2 --- diameter of steel plate for friction coefficient test, unit is millimeter (mm);

µ --- friction coefficient of movable bearing;

µs --- high performance sliding friction coefficient;

µd --- high performance sliding friction coefficient;

eta --- intrinsic viscosity number, the unit is deciliter per gram (dL/g).

4 Classification, structure and model

4.1 Classification

4.1.1 Highway bridge basin supports (hereinafter referred to as "supports") are divided into.

a) Two-way movable support. with vertical load, vertical rotation and two-way sliding performance, code SX;

b) Longitudinal movable support. it has vertical and horizontal load bearing, vertical rotation and vertical sliding performance, code ZX;

c) Horizontal movable support. it has vertical and vertical horizontal load bearing, vertical rotation and lateral sliding performance, code HX;

d) fixed support. it has vertical and vertical horizontal load bearing and vertical rotation performance, coded as GD;

e) Shock-absorbing vertical movable support. it has vertical and horizontal load bearing, vertical rotation, vertical sliding and shock absorption performance, code JJX;

f) Shock-absorbing horizontal movable support. it has vertical and longitudinal horizontal load bearing, vertical rotation, lateral slip and shock absorption performance, code JJHX;

JT/T 391-2019

g) Shock-absorbing fixed support. it has vertical and vertical horizontal load bearing and vertical rotation and shock-absorbing performance, code JJGD.

4.1.2 Supports are divided according to the applicable temperature range.

a) Normal temperature type support. suitable for-25 °C ~ + 60 °C, code C;

b) Cold-resistant support. suitable for-40 °C ~ + 60 °C, code F.

4.2 Structure

4.2.1 Two-way movable bearing, longitudinal movable bearing and transverse movable bearing are made of top plate, stainless steel cold-rolled steel plate, high-performance skateboard, high-performance slide Plate seals, intermediate steel plates, rubber plates, brass seals, steel basins, anchor bolts, sleeves, screws, rubber seals and dust enclosures, etc.

The top stop of the longitudinal movable support and the transverse movable support also includes lateral stainless steel cold-rolled steel bars, which are provided on both sides of the corresponding intermediate steel plate.

SFZ1 Three-layer composite board guide slider. The structure is shown in Figure 1 and Figure 2 (dust enclosure is not shown).

Explanation.

1 --- top plate; 6 --- anchor bolts; 11 --- rubber plate;

2 --- stainless steel cold rolled steel plate; 7 --- sleeve; 12 --- brass seal ring;

3 --- high performance slide seal; 8 --- washer; 13 --- rubber seal.

4 --- high performance slide; 9 --- screw;

5 --- intermediate steel plate; 10 --- steel basin;

Figure 1 Structure of a two-way movable support

Explanation.

1 --- top plate; 4 --- high performance skateboard sealing ring; 7 --- intermediate steel plate; 10 --- sleeve; 13 --- rubber plate;

2 --- lateral stainless steel cold rolled steel bars; 5-stainless steel cold rolled steel plates; 8 --- anchor bolts; 11 --- screw; 14 --- brass seal ring;

3 --- SFZ1 three-layer composite board guide slider; 6 --- high performance skateboard; 9 --- washer; 12 --- steel basin; 15 --- rubber seal ring.

Figure 2 Schematic diagram of vertical movable support and horizontal movable support

JT/T 391-2019

4.2.2 The fixed support consists of the top plate, rubber plate, brass seal ring, steel basin, anchor bolt, sleeve, screw, rubber seal ring and dust enclosure.

The composition and structure are shown in Figure 3 (dust enclosure is not shown).

Explanation.

1 --- top plate; 6 --- anchor bolts;

2 --- dust ring; 7 --- washer;

3 --- brass sealing ring; 8 --- steel basin;

4 --- rubber plate; 9 --- screw.

5 --- sleeve;

Figure 3 Structure of the fixed support

4.2.3 The shock-absorbing fixed support consists of the top plate, high damping rubber ring, upper friction plate, lower friction plate, lower lining plate, rubber plate, brass seal ring, Basin, anchor bolts, sleeves, screws, rubber seals and dust enclosures, etc. The structure is shown in Figure 4 (the dust enclosure is not shown).

Explanation.

1 --- top plate; 7 --- anchor bolts;

2 --- high damping rubber ring; 8 --- washer;

3 --- upper friction plate; 9 --- steel basin;

4 --- lower friction plate; 10 --- rubber plate;

5 --- the lower lining plate; 11 --- the brass seal ring;

6 --- sleeve; 12 --- screw.

Figure 4 Structure of shock-absorbing fixed support

4.2.4 Shock-absorbing longitudinal movable bearings and shock-absorbing transverse movable bearings are composed of a top plate, a high-damping rubber ring, an upper friction plate, a lower friction plate, and stainless steel.

Cold rolled steel plate, high performance skateboard, high performance skateboard seal ring, intermediate steel plate, rubber plate, brass seal ring, steel basin, anchor bolt, underliner, SFZ1 it consists of three-layer composite slide guide sliders, lateral stainless steel cold-rolled steel bars, and dustproof enclosures. The structure is shown in Figure 5 (the dustproof enclosures are not shown).

JT/T 391-2019

Explanation.

1 --- top plate; 10 --- anchor bolts;

2 --- lateral stainless steel cold rolled steel bars; 11 --- sleeve;

3 --- SFZ1 three-layer composite board guide slider; 12 --- screw;

4 --- high-performance skateboard sealing ring; 13 --- steel basin;

5 --- stainless steel cold-rolled steel sheet; 14 --- rubber sheet;

6 --- high performance skateboard; 15 --- under lining board;

7 --- intermediate steel plate; 16 --- high damping rubber ring;

8 --- upper friction plate; 17 --- brass seal ring;

9 --- lower friction plate; 18 --- washer.

Figure 5 Schematic diagram of the structure of the shock-absorbing longitudinal movable bearing and the shock-absorbing transverse movable bearing

4.3 Model

Refer to Figure 6 for the bearing model.

Figure 6 Model of support model

Example 1.

× × × × annual design, the vertical design bearing capacity is 15MN, the horizontal and horizontal design bearing capacity is 10% of the vertical design bearing capacity.

It is a cold-resistant basin support of ± 100mm, and its model is expressed as GPZ (× × × ×) 15-10% -SX- ± 100-F.

Example 2.

× × × × year design, vertical design bearing capacity 15MN, horizontal design bearing capacity is 15% of vertical design bearing capacity.

The normal temperature type basin support of ± 50mm, its model is expressed as GPZ (× × × ×) 15 % 15% -Z × - ± 50-C.

JT/T 391-2019

Example 3.

× × × × Annual design, fixed normal temperature basin bearing with vertical design bearing capacity of 15MN and horizontal design bearing capacity of 10% of vertical design bearing capacity.

It is expressed as GPZ (× × × ×) 15 × 10% ZGDQC.

Example 4.

× × × × year design, vertical design bearing capacity of 15MN shock-absorbing fixed cold-resistant basin type bearing, its model is expressed as GPZ (× × × ×) 15-JZGD-F.

Example 5.

× × × × year design, vertical design bearing capacity of 15MN, design displacement of ± 150mm along the bridge, longitudinally movable normal temperature basin support, its model it is expressed as GPS (× × × ×) 15-JZZXZZ ± 150-C.

5 Technical requirements

5.1 Overall performance requirements

5.1.1 Service life

Under normal design, production, installation, operation and maintenance conditions, the service life of the support should not be less than 50 years.

5.1.2 Vertical design bearing capacity

5.1.2.1 The vertical design bearing capacity of the support is divided into 33 levels, namely 1MN, 1. 5MN, 2MN, 2. 5MN, 3MN, 3. 5mn, 4mn, 5mn, 6mn, 7MN, 8MN, 9MN, 10MN, 12. 5MN, 15MN, 17. 5MN, 20MN, 22. 5MN, 25MN, 27. 5MN, 30MN, 32. 5MN, 35MN, 37. 5mn, 40mn, 45mn, 50mn, 55mn, 60mn, 65mn, 70mn, 75mn, 80mn.

5.1.2.2 Under the vertical design bearing capacity, the compression deformation of the bearing should not be greater than 2% of the total height of the bearing, and the upper opening of the steel basin and the ring is changed radially the shape should not be greater than 0. 05%.

5.1.3 horizontal design bearing capacity

5.1.3.1 The non-sliding direction horizontal design bearing capacity of the fixed support, longitudinal movable support and lateral movable support is divided into 2 levels, that is, the support is vertical the design bearing capacity is 10% and 15%.

5.1.3.2 Non-sliding direction horizontal design bearing of shock-absorbing fixed bearings, shock-absorbing longitudinal movable bearings and shock-absorbing transverse movable bearings the force is 20% of the vertical design bearing capacity of the bearing.

5.1.4 Friction coefficient of movable support Under the condition of 5201-2 silicone grease lubrication, the friction coefficient (µ) of the movable bearing should meet the following requirements.

a) Normal temperature type support. in the range of -25 ° C to + 60 ° C, µ<=0. 03;

b) Cold-resistant bearings. in the range of -40 ° C to + 60 ° C, µ<=0. 05.

5.1.5 corners

The vertical design rotation angle of the support is not less than 0. 02rad.

5.1.6 displacement

The bidirectional movable support and longitudinal movable support are designed in five steps along the bridge, namely ± 50mm, ± 100mm, ± 150mm, ±.200mm, ± 250mm; the displacement of the transverse bridge of the bidirectional movable support and lateral movable support is ± 50mm. When there are special needs, the amount of displacement can be adjusted according to actual needs, and the adjustment step is ± 50mm.

5.2 Appearance

5.2.1 The exposed surface of the support should be flat and beautiful, the welds should be uniform, the coating surface should be smooth, and there should be no shedding, flow marks, wrinkles, etc.

5.2.2 After the support is assembled, the top plate and the steel basin shall be parallel. Longitudinal movable bearing, shock-absorbing longitudinal movable bearing, transverse movable bearing and shock-absorbing type JT/T 391-2019 the horizontal sliding support SFZ1 three-layer composite plate guide sliders and lateral cold-rolled stainless steel bars shall be kept parallel.

5.2.3 The height deviation of the finished bearing should meet the requirements in Table 1. During the measurement, a vertical load of 50kN to 100kN can be loaded on the support.

Load to eliminate gaps and air interlayers between components.

Table 1 Height deviation after assembly of the finished bearing

Bearing vertical design bearing capacity (MN) Height deviation after assembly (mm) 1 to 20 ± 3 22.5 to 60 ± 4 65 to 80 ± 5

5.3 Materials

5.3.1 steel

5.3.1.1 When the steel plate of the support is used as the top plate and intermediate steel plate, its chemical composition and mechanical properties should not be lower than those of GB/T 699 grade 25 or the provisions of GB/T 1591 in grade 345.

5.3.1.2 For the steel castings for bearings, the steel castings with the designation YG270 ~ 500 shall be used, and their chemical composition and mechanical properties shall comply with GB/T the provisions of 11352.

5.3.1.3 The anchor bolts of the support shall be made of alloy structural steel with a grade of 40Cr, and its chemical composition and mechanical properties shall comply with GB/T 3077.

Provisions. The sleeve and screw shall be made of 45 steel, and their chemical composition and mechanical properties shall meet the requirements of GB/T 699.

5.3.1.4 When basin bearings are used in the C1 ~ C3 corrosion environment specified in JT/T 722, stainless steel cold-rolled steel plates and Stainless steel cold-rolled steel bars on the guide stop should use 06Cr19Ni10, 06Cr18Ni11Ti stainless steel plates; if used in C4 ~ C5QM in the highly corrosive environment of coastal and offshore areas, 06Cr17Ni12Mo2, 202Cr17Ni12Mo2 stainless steel plates should be used. Various grade steel plates the chemical composition and mechanical properties shall meet the requirements of GB/T 3280.

5.3.2 Rubber

Normal temperature type support rubber plate uses neoprene or natural rubber. Cold-resistant support rubber plate uses natural rubber or EPDM rubber.

The sealing ring uses EPDM rubber. The high-damping rubber ring uses EPDM rubber. All the above rubber materials should not use recycled rubber and sulfur the minimum glue content of chemical waste should not be less than 55 percent by weight. See Table 2 for the physical and mechanical properties of the rubber sheet rubber for the support. Finished rubber sheet the physical and mechanical properties of the core compound can be lower than the indicators specified in Table 2, but the hardness change should not be greater than 10%, and the tensile strength drop should not be greater than 15%, the elongation at break should not be greater than 30%.

Table 2 Physical and mechanical properties of rubber for bearings

index

Highly damped rubber ring Neoprene natural rubber EPDM rubber EPDM rubber EPDM rubber Hardness (IRHD) Normal temperature type Cold-resistant 60 ± 5 60 ± 5 50 ± 5 60 ± 5 50 ± 5 50 ± 5 Tensile strength (MPa) >= 17. 5 >=17. 5 >=15. 2 >=12. 0 >=10. 0 Elongation at break (%) >=400 >=450 >=350 >=350 >=550 Brittleness temperature (°C) <= -40 <= -55 <= -60 <= -60 <= -60 Permanent deformation under constant compression (%) <=25 <=30 <=25 <=25 <=60 JT/T 391-2019

Table 2 (continued)

index

Highly damped rubber ring Neoprene natural rubber EPDM rubber EPDM rubber EPDM rubber Resistance to ozone aging Ozone concentration (100 ± 10) × 10-8 (25 ± 5) × 10-8 (100 ± 10) × 10-8 (100 ± 10) × 10-8 (50 ± 5) × 10-8 Surface condition. No cracks, no cracks, no cracks, no cracks-hot air Aging test Hardness change (IRHD) < + 10 ± 10 < + 10 < + 10-5 ~ + 10 Tensile strength reduction rate (%) < 15 < 15 < 15 < 15-15 ~ + 15 Elongation at break Reduction rate (%) < 40 < 20 < 40 < 40-20 ~ + 20

5.3.3 High performance skateboard

5.3.3.1 The mechanical properties of high performance skateboards should not be lower than those of modified PTFE skateboards and ultra high molecular weight polyethylene skateboards in JT/T 901 the relevant physical and mechanical properties of the board shall meet the requirements of Table 3. The shock-absorbing support should use modified PTFE slide.

Table 3 Physical and mechanical properties of high performance skateboards

Index modified PTFE slide modified ultra high molecular weight polyethylene slide Molecular weight->= 9 million Density (g/cm3) 2. 00 ~ 2. 10 0. 93 to 0. 98 Tensile strength (MPa) >=21 >=30 Elongation at break (%) >=300 Ball indentation hardness (H132/60) (MPa) 26. 4 to 39. 6

5.3.3.2 High-performance skateboard application 5201-2 silicone grease lubrication, friction with stainless steel cold-rolled steel plate in the state of silicone grease lubrication, friction the coefficient and line abrasion rate shall meet the requirements of Table 4.

Table 4 Friction coefficient, line abrasion rate and test conditions of high performance skateboard

Project technical indicators Test conditions Test temperature (°C) Average compressive stress (MPa) Relative sliding speed (Mm/s) Back and forth sliding distance (Mm) Cumulative sliding distance (Km) Coefficient of static friction µs <=0. 010 21 21 2 <=0. 018 0 ± 2 <=0. 035-35 ± 2 Coefficient of dynamic friction µd <=0. 05 21 ± 2 <=0. 012 0 ± 2 <=0. 025-35 ± 2 Line wear rate (Mm/km) <=5 21 ± 2 0. 4--0. 4--0. 4--15--15--15--15 ± 10 50 JT/T 391-2019 5.3.4 5201-2 Silicone grease 5. 3. 4. 15201-2 Silicone grease is milky white or light gray translucent fat, and there should be no mechanical impurities. Physical and chemical properties of 5201-2 silicone grease the standard shall comply with the regulations of HG/T 2502 first-class products.

5.3.4.2 Within the operating temperature range of the bearing, 5201-2 silicone grease should maintain the lubricating effect on the sliding surface and not dry up.

Should be harmful and have good resistance to ozone, corrosion and water.

5.3.5 Brass seal

The brass seal ring should be H62 grade brass plate in the supply state of Z2 or M, and its chemical composition and mechanical properties should conform to GB/T Provisions of 2040.

5.3.6 SFZ1 Three-layer composite board SFZ1 three-layer composite board consists of a base layer of high-density copper alloy plate, an intermediate layer of sintered porous bronze powder, 80% polytetrafluoroethylene and 20% lead (body Volume ratio) filled PTFE surface layer sintered. SFZ1 Three-layer composite board shall meet the following requirements.

a) The ...