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Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces JT/T 391-2009 Pot bearing for highway bridges. In addition to editorial changes, the following main technical changes have been made with respect to JT/T 391-2009: ——The definition and performance index requirements of high performance slide plates are added (see 3.1.4 and 5.3.3); ——Transverse movable bearing and transverse movable bearing of isolation type are added (see 4.1); ——The model representation method of bearing under horizontal bearing capacity is added (see 4.3); ——The requirements for the working life of pot bearings are added (see 5.1.1); ——The classification standards and test methods of horizontal bearing capacity of pot bearings are added (see 5.1.3 and Annex B); ——The technical requirements for bearing appearance are added (see 5.2); ——The bearing classification of vertical design bearing capacity 0.4MN~0.8MN is deleted (see 4.1.1 of Edition 2009); ——The bearing classification of vertical design bearing capacity 65MN~80MN is added (see 5.1.2); ——The technical requirements and test methods for anchor bolts, sleeves, screws, etc. are added (see 5.3.1 and 6.3.1); ——The acceptable appearance defects of rubber plates are modified (see 5.4.2.2; 4.4.1 of Edition 2009); ——The PTFE plate materials are deleted (see 4.2.2 of Edition 2009); ——Anti-corrosion measures for anchor bolts and sleeves are added, and anti-corrosion measures for steel parts are modified (see 5.5.5); ——The inspection rules are modified (see Clause 7; Clause 7 of Edition 2009). This standard was proposed by and is under the jurisdiction of the National Technical Committee on Traffic Engineering Facilities (Highway) of Standardization Administration of China (SAC/TC 223). The previous editions of this standard are as follows: ——JT 3141-1990; ——JT 391-1999, JT/T 391-2009. Pot bearing for highway bridge 1 Scope This standard specifies the product classification, structural forms, models, technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of pot bearings for highway bridges. This standard is applicable to the production, inspection and use of pot bearings with design bearing capacity of 1MN~80MN for highway bridges. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties GB/T 699 Quality carbon structure steels GB/T 700 Carbon structural steels GB/T 1040.3 Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets GB/T 1184 Geometrical tolerancing - Geometrical tolerances for features without individual tolerance indications GB/T 1591 High strength low alloy structural steels GB/T 1632.3 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometer - Part 3: Polyethylenes and polypropylenes GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 2040 Copper and copper alloy sheet GB/T 3077 Alloy structure steels GB/T 3280 Cold rolled stainless steel plate, sheet and strip GB/T 3323 Radiographic examination of fusion welded joints in metallic materials GB/T 3398.1 Plastics - Determination of hardness - Part 1: Ball indentation method GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method GB/T 6031 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD) GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes GB/T 7759.1 Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At ambient or elevated temperatures GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test GB/T 11345 Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment GB/T 11352 Carbon steel castings for general engineering purpose HG/T 2198 Vulcanized rubber - The general requirements for the physical test method HG/T 2502 5201 silicone grease JB/T 5936 Engineering machinery - General technical specifications for mechanical processed parts JB/T 5943 Construction machinery - General specifications for welding parts JT/T 722 Specifications of protective coating for highway bridge steel structure JT/T 901 Polymer materials sliding plate for bridge bearings 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1.1 pot bearing bearing using the rubber plate sealed in the steel pot to bear the dead load and live load of the superstructure and transfer the load to the sub-structure 3.1.2 working life year in which the bearing can work normally under the conditions of normal design, production, installation, operation and maintenance 3.1.3 friction plate steel plate with specified friction coefficient and energy dissipation capacity for isolation bearings 3.1.4 high performance slide plate sliding elements with self-lubricity, wear resistance and physical and mechanical properties, usually referring to modified PTFE slide plate or modified UHMWPE slide plates processed from polyethylene raw materials with average viscosity molecular weight greater than 9 million 3.2 Symbols For the purposes of this document, the following symbols apply. D——Diameter of rubber plate, mm; D1——Diameter of brass sealing ring, mm; M——Molecular weight, dimensionless; d——Diameter of high performance slide plate, mm; d1——Plane diameter of the grease storage pit of high performance slide plate, mm; d2——Diameter of steel plate for friction coefficient test, mm; μ——Friction coefficient of movable bearing; μs——Static friction coefficient of high performance slide plate; μd——Dynamic friction coefficient of high performance slide plate; η——Intrinsic viscosity number, dL/g. 4 Classification, structural forms and models 4.1 Classification 4.1.1 According to the use performance, the pot bearing for highway bridge is divided into: a) bidirectional movable bearing: with vertical bearing capacity, vertical rotation and bidirectional sliding performance, in the code of SX; b) longitudinal movable bearing: with vertical and transverse horizontal bearing capacity, vertical rotation and longitudinal sliding performance, in the code of ZX; c) transverse movable bearing: with vertical and longitudinal horizontal bearing capacity, vertical rotation and transverse sliding performance, in the code of HX; d) fixed bearing: with vertical and longitudinal/transverse horizontal bearing capacity and vertical rotation performance, in the code of GD; e) longitudinal movable bearing of isolation type: with vertical and transverse horizontal bearing capacity, vertical rotation and longitudinal sliding and isolation performance, in the code of JZZX; f) transverse movable bearing of isolation type: with vertical and longitudinal horizontal bearing capacity, vertical rotation and transverse sliding and isolation performance, in the code of JZHX; g) fixed isolation bearing: with vertical and longitudinal/ transverse horizontal bearing capacity, vertical rotation and isolation performance, in the code of JZGD. 4.1.2 According to the applicable temperature range, the bearing is divided into: a) normal temperature bearing: applicable to -25℃~+60℃, in the code of C; b) cold-resistant bearing: applicable to -40℃~+60℃, in the code of F. 4.2 Structural form 4.2.1 Bidirectional movable bearing, longitudinal movable bearing and transverse movable bearing are composed of top plate, cold rolled stainless steel plate, high performance slide plate, sealing ring of high performance slide plate, intermediate steel plate, rubber plate, brass sealing ring, steel pot, anchor bolt, sleeve, screw, rubber sealing ring, dustproof coaming, etc.; on the top plate block of the longitudinal movable bearing and transverse movable bearing, there shall be lateral cold rolled stainless steel bar, and on both sides of the corresponding intermediate steel plate, there shall be SF-1 three-layer composite plate guide slider. See Figure 1 and Figure 2 for the structure (the dustproof coaming is not given). Key 1——Top plate 6——Anchor bolt 11——Rubber plate‘ 2——Cold rolled stainless steel plate 7——Sleeve 12——Brass sealing ring 3——Sealing ring of high performance slide plate 8——Washer 13——Rubber sealing ring 4——High performance slide plate 9——Threaded rod 5——Intermediate steel plate 10——Steel pot Figure 1 Schematic diagram of bidirectional movable bearing Key 1——Top plate 9——Washer 2——Lateral cold rolled stainless steel bar 10——Sleeve 3——SF-1 three-layer composite plate guide slider 11——Threaded rod 4——Sealing ring of high performance slide plate 12——Steel pot 5——Cold rolled stainless steel plate 13——Rubber plate 6——High performance slide plate 14——Brass sealing ring 7——Intermediate steel plate 15——Rubber sealing ring 8——Anchor bolt Figure 2 Schematic diagram of longitudinal movable bearing and transverse movable bearing 4.2.2 The fixed bearing is composed of top plate, rubber plate, brass sealing ring, steel pot, anchor bolt, sleeve, threaded rod, rubber sealing ring and dustproof coaming, etc. See Figure 3 for the structure (the dustproof coaming is not given). Key 1——Top plate 6——Anchor bolt 2——Dustproof ring 7——Washer 3——Brass sealing ring 8——Steel pot 4——Rubber plate 9——Threaded rod 5——Sleeve Figure 3 Schematic diagram of fixed bearing 4.2.3 The fixed isolation bearing is composed of top plate, high damping rubber ring, upper friction plate, lower friction plate, lower lining plate, rubber plate, brass sealing ring, steel pot, anchor bolt, sleeve, threaded rod, rubber sealing ring and dustproof coaming, etc. See Figure 4 for the structure (the dustproof coaming is not given). Key 1——Top plate 7——Anchor bolt 2——High damping rubber ring 8——Washer 3——Upper friction plate 9——Steel pot 4——Lower friction plate 10——Rubber plate 10——Lower lining plate 11——Brass sealing ring 6——Sleeve 12——Threaded rod Figure 4 Schematic diagram of fixed isolation bearing 4.2.4 The longitudinal movable bearing of isolation type and transverse movable bearing of isolation type are composed of top plate, high damping rubber ring, upper friction plate, lower friction plate, cold rolled stainless steel plate, high performance slide plate, sealing ring of high performance slide plate, intermediate steel plate, rubber plate, brass sealing ring, steel pot, anchor bolt, lower lining plate, SF-1 three-layer composite plate guide slider, lateral cold rolled stainless steel bar and dustproof coaming, etc. See Figure 5 for the structure (the dustproof coaming is not given). Key 1——Top plate 10——Anchor bolt 2——Lateral cold rolled stainless steel bar 11——Sleeve 3——SF-1 three-layer composite plate guide slider 12——Threaded rod 4——Sealing ring of high performance slide plate 13——Steel pot 5——Cold rolled stainless steel plate 14——Rubber plate 6——High performance slide plate 15——Lower lining plate 7——Intermediate steel plate 16——High damping rubber ring 8——Upper friction plate 17——Brass sealing ring 9——Lower friction plate 18——Washer Figure 5 Schematic diagram of longitudinal movable bearing of isolation type and transverse movable bearing of isolation type 4.3 Models See Figure 6 for the representation method of bearing model. Figure 6 Representation method of bearing model Example 1: For the cold-resistant bidirectional movable pot bearing, designed in ××××, with vertical design bearing capacity of 15MN, transverse horizontal design bearing capacity of 10% of the vertical design bearing capacity, design displacement along the bridge of ±100mm, its mode is expressed as GPZ(××××)15-10%-SX-±100-F. Example 2: For the longitudinal movable pot bearing of normal temperature type, designed in ××××, with vertical design bearing capacity of 15MN, transverse horizontal design bearing capacity of 15% of the vertical design bearing capacity, displacement along the bridge of ±50mm, its mode is expressed as GPZ(××××)15-15%-ZX-±50-C. Example 3: For the fixed pot bearing of normal temperature type, designed in ××××, with vertical design bearing capacity of 15MN, horizontal design bearing capacity of 10% of the vertical design bearing capacity, its mode is expressed as GPZ(××××)15-10%-GD-C. Example 4: For the cold-resistant fixed isolation pot bearing, designed in ××××, with vertical design bearing capacity of 15MN, its mode is expressed as GPZ(××××)15-JZGD-F. Example 5: For the longitudinal movable pot bearing of normal temperature and isolation type, designed in ××××, with vertical design bearing capacity of 15MN and design displacement along the bridge of ±150mm, its mode is expressed as GPZ(××××)15-JZZX-±150-C. Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 4 Classification, structural forms and models 5 Technical requirements 6 Test methods 7 Inspection rules 8 Marking, packaging, transportation and storage Annex A (Normative) Test method for vertical bearing capacity of bearings Annex B (Normative) Test method for horizontal bearing capacity of bearings Annex C (Normative) Test method for friction coefficient of bearings Annex D (Normative) Test method for bearing rotation angle Annex E (Informative) Description of bearing installation (example) 公路桥梁盆式支座 1 范围 本标准规定了公路桥梁盆式支座的产品分类、结构形式、型号、技术要求、试验方法、检验规则,以及标志、包装、运输和储存等要求。 本标准适用于支座设计承载力为1MN~80MN的公路桥梁盆式支座的生产、检验和使用。 2 规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。 GB/T 528 硫化橡胶或热塑性橡胶 拉伸应力应变性能的测定 GB/T 699 优质碳素结构钢 GB/T 700 碳素结构钢 GB/T 1040.3 塑料 拉伸性能的测定 第3部分:薄膜和薄片的试验条件 GB/T 1184 形状和位置公差 未注公差值 GB/T 1591 低合金高强度结构钢 GB/T 1632.3 塑料 使用毛细管黏度计测定聚合物稀溶液黏度 第3部分:聚乙烯和聚丙烯 GB/T 1682 硫化橡胶 低温脆性的测定 单试样法 GB/T 1804 一般公差 未注公差的线性和角度尺寸的公差 GB/T 2040 铜及铜合金板材 GB/T 3077 合金结构钢 GB/T 3280 不锈钢冷轧钢板和钢带 GB/T 3323 金属熔化焊焊接接头射线照相 GB/T 3398.1 塑料 硬度测定 第1部分:球压痕法 GB/T 3512 硫化橡胶或热塑性橡胶 热空气加速老化和耐热试验 GB/T 6031 硫化橡胶或热塑性橡胶 硬度的测定(10IRHD~100IRHD) GB/T 7233.1 铸钢件 超声检测 第1部分:一般用途铸钢件 GB/T 7759.1 硫化橡胶或热塑性橡胶 压缩永久变形的测定 第1部分:在常温及高温条件下 GB/T 7762 硫化橡胶或热塑性橡胶 耐臭氧龟裂 静态拉伸试验 GB/T 11345 焊缝无损检测 超声检测 技术、检测等级和评定 GB/T 11352 一般工程用铸造碳钢件 HG/T 2198 硫化橡胶物理试验方法的一般要求 HG/T 2502 5201硅脂 JB/T 5936 工程机械 机械加工件通用技术条件 JB/T 5943 工程机械 焊接件通用技术条件 JT/T 722 公路桥梁钢结构防腐涂装技术条件 JT/T 901 桥梁支座用高分子材料滑板 3 术语、定义和符号 3.1 术语和定义 下列术语和定义适用于本文件。 3.1.1 盆式支座 pot bearing 利用密封在钢盆中的橡胶板承受上部结构恒载和活载,并将该荷载传递到下部结构的支座。 3.1.2 使用年限 working life 在正常设计、生产、安装、运营和养护条件下,支座能正常工作的年限。 3.1.3 摩擦板 friction plate 用于减震支座,具有规定的摩擦系数和耗能能力的钢板件。 3.1.4 高性能滑板 high performance slide plate 具备自润滑性、耐磨性和物理机械性能的滑动元件,通常指改性聚四氟乙烯滑板或由黏均分子量大于900万的聚乙烯原料加工而成的改性超高分子量聚乙烯滑板。 3.2 符号 下列符号适用于本文件。 D——橡胶板直径,单位为毫米(mm); D1——黄铜密封圈直径,单位为毫米(mm); M——分子量,无量纲; d——高性能滑板直径,单位为毫米(mm); d1——高性能滑板储脂坑平面直径,单位为毫米(mm); d2——摩擦系数试验用钢板直径,单位为毫米(mm); μ——活动支座摩擦系数; μs——高性能滑板静摩擦系数; μd——高性能滑板动摩擦系数; η——特性黏数,单位为分升每克(dL/g)。 4 分类、结构形式及型号 4.1 分类 4.1.1 公路桥梁盆式支座(以下简称“支座”)按使用性能分为: a) 双向活动支座:具有竖向承载、竖向转动和双向滑移性能,代号SX; b) 纵向活动支座:具有竖向和横向水平承载、竖向转动和纵向滑移性能,代号ZX; c) 横向活动支座:具有竖向和纵向水平承载、竖向转动和横向滑移性能,代号HX; d) 固定支座:具有竖向和纵横向水平承载及竖向转动性能,代号GD; e) 减震型纵向活动支座:具有竖向和横向水平承载、竖向转动、纵向滑移及减震性能,代号JZZX; f) 减震型横向活动支座:具有竖向和纵向水平承载、竖向转动、横向滑移及减震性能,代号JZHX; g) 减震型固定支座:具有竖向和纵横向水平承载及竖向转动和减震性能,代号JZGD。 4.1.2 支座按适用温度范围分为: a) 常温型支座:适用于-25℃~+60℃,代号C; b) 耐寒型支座:适用于-40℃~+60℃,代号F。 4.2 结构形式 4.2.1 双向活动支座、纵向活动支座和横向活动支座由顶板、不锈钢冷轧钢板、高性能滑板、高性能滑板密封圈、中间钢板、橡胶板、黄铜密封圈、钢盆、锚固螺栓、套筒、螺杆、橡胶密封圈和防尘围板等组成,纵向活动支座和横向活动支座的顶板挡块上还包括侧向不锈钢冷轧钢条,对应的中间钢板两侧设有SF-1三层复合板导向滑条,结构示意见图1、图2(未示出防尘围板)。 说明: 1——顶板; 6——锚固螺栓; 11——橡胶板; 2——不锈钢冷轧钢板; 7——套筒; 12——黄铜密封圈; 3——高性能滑板密封圈; 8——垫圈; 13——橡胶密封圈。 4——高性能滑板; 9——螺杆; 5——中间钢板; 10——钢盆; 图1 双向活动支座结构示意 说明: 1——顶板; 4——高性能滑板密封圈; 7——中间钢板; 10——套筒; 13——橡胶板; 2——侧向不锈钢冷轧钢条; 5——不锈钢冷轧钢板; 8——锚固螺栓; 11——螺杆; 14——黄铜密封圈; 3——SF-1三层复合板导向滑条; 6——高性能滑板; 9——垫圈; 12——钢盆; 15——橡胶密封圈。 图2 纵向活动支座和横向活动支座结构示意 4.2.2 固定支座由顶板、橡胶板、黄铜密封圈、钢盆、锚固螺栓、套筒、螺杆、橡胶密封圈和防尘围板等组成,结构示意见图3(未示出防尘围板)。 说明: 1——顶板; 6——锚固螺栓; 2——防尘圈; 7——垫圈; 3——黄铜密封圈; 8——钢盆; 4——橡胶板; 9——螺杆。 5——套筒; 图3 固定支座结构示意 4.2.3 减震型固定支座由顶板、高阻尼橡胶圈、上摩擦板、下摩擦板、下衬板、橡胶板、黄铜密封圈、钢盆、锚固螺栓、套筒、螺杆、橡胶密封圈和防尘围板等组成,结构示意见图4(未示出防尘围板)。 说明: 1——顶板; 7——锚固螺栓; 2——高阻尼橡胶圈; 8——垫圈; 3——上摩擦板; 9——钢盆; 4——下摩擦板; 10——橡胶板; 5——下衬板; 11——黄铜密封圈; 6——套筒; 12——螺杆。 图4 减震型固定支座结构示意 4.2.4 减震型纵向活动支座和减震型横向活动支座由顶板、高阻尼橡胶圈、上摩擦板、下摩擦板、不锈钢冷轧钢板、高性能滑板、高性能滑板密封圈、中间钢板、橡胶板、黄铜密封圈、钢盆、锚固螺栓、下衬板、SF-1三层复合滑板导向滑条、侧向不锈钢冷轧钢条及防尘围板等组成,结构示意见图5(未示出防尘围板)。 说明: 1——顶板; 10——锚固螺栓; 2——侧向不锈钢冷轧钢条; 11——套筒; 3——SF-1三层复合板导向滑条; 12——螺杆; 4——高性能滑板密封圈; 13——钢盆; 5——不锈钢冷轧钢板; 14——橡胶板; 6——高性能滑板; 15——下衬板; 7——中间钢板; 16——高阻尼橡胶圈; 8——上摩擦板; 17——黄铜密封圈; 9——下摩擦板; 18——垫圈。 图5 减震型纵向活动支座和减震型横向活动支座结构示意 4.3 型号 支座型号表示方法见图6。 适用温度分类代号:见4.1.2; 活动支座顺桥向位移量,单位为毫米(mm); 使用性能分类代号:见4.1.1; 支座水平设计承载力,以竖向设计承载力的百分比表示:10%,15%; 支座竖向设计承载力,单位为兆牛(MN); 支座系列,用标准发布年号表示; 支座名称代号。 图6 支座型号表示方法 示例1: ××××年设计,竖向设计承载力15MN、横向水平设计承载力为竖向设计承载力10%的双向活动顺桥向设计位移为±100mm的耐寒型盆式支座,其型号表示为GPZ(××××)15-10%-SX-±100-F。 示例2: ××××年设计,竖向设计承载力15MN、横向水平设计承载力为竖向设计承载力15%的纵向活动顺桥向位移为±50mm的常温型盆式支座,其型号表示为GPZ(××××)15-15%-ZX-±50-C。 示例3: ××××年设计,竖向设计承载力15MN、水平设计承载力为竖向设计承载力10%的固定常温型盆式支座,其型号表示为GPZ(××××)15-10%-GD-C。 示例4: ××××年设计,竖向设计承载力15MN的减震固定耐寒型盆式支座,其型号表示为GPZ(××××)15-JZGD-F。 示例5: ××××年设计,竖向设计承载力15MN、顺桥向设计位移为±150mm的减震型纵向活动常温型盆式支座,其型号表示为GPZ(××××)15-JZZX-±150-C。 5 技术要求 5.1 整体性能要求 5.1.1 使用年限 在正常设计、生产、安装、运营和养护条件下,支座使用年限不应低于50年。 5.1.2 竖向设计承载力 5.1.2.1 支座竖向设计承载力分33级,即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 在竖向设计承载力作用下,支座压缩变形不应大于支座总高度的2%,钢盆盆环上口径向变形不应大于盆环外径的0.05%。 5.1.3 水平设计承载力 5.1.3.1 固定支座、纵向活动支座和横向活动支座的非滑移方向水平设计承载力分2级,即支座竖向设计承载力的10%、15%。 5.1.3.2 减震型固定支座、减震型纵向活动支座和减震型横向活动支座的非滑移方向水平设计承载力为支座竖向设计承载力的20%。 5.1.4 活动支座摩擦系数 在5201-2硅脂润滑条件下,活动支座摩擦系数(μ)应满足下列要求: a) 常温型支座:在-25℃~+60℃范围内,μ≤0.03; b) 耐寒型支座:在-40℃~+60℃范围内,μ≤0.05。 5.1.5 转角 支座竖向设计转动角度不小于0.02rad。 5.1.6 位移 双向活动支座和纵向活动支座顺桥向设计位移量分5级,即±50mm、±100mm、±150mm、±200mm、±250mm;双向活动支座和横向活动支座的横桥向设计位移量为±50mm。当有特殊需要时,可按实际需要调整位移量,调整位移级差为±50mm。 5.2 外观 5.2.1 支座外露表面应平整、美观,焊缝均匀,涂装表面应光滑,不应有脱落、流痕、褶皱等现象。 5.2.2 支座组装后顶板与钢盆应平行。纵向活动支座、减震型纵向活动支座、横向活动支座及减震型横向活动支座的SF-1三层复合板导向滑条和侧向冷轧不锈钢条应保持平行。 5.2.3 成品支座组装后高度偏差应满足表1的要求。量测时,可对支座加载50kN~100kN的竖向荷载,以消除各部件缝隙及空气夹层。 表1 成品支座组装后高度偏差 支座竖向设计承载力(MN) 组装后高度偏差(mm) 1~20 ±3 22.5~60 ±4 65~80 ±5 5.3 材料 5.3.1 钢件 5.3.1.1 支座顶板、中间钢板等采用钢板时,其化学成分和力学性能不应低于GB/T 699中牌号25或GB/T 1591中牌号Q345的规定。 5.3.1.2 支座用铸钢件,应采用牌号为ZG270-500的铸钢件,其化学成分、力学性能等应符合GB/T 11352的规定。 5.3.1.3 支座锚固螺栓应采用牌号为40Cr的合金结构钢,其化学成分、力学性能应符合GB/T 3077的规定。套筒及螺杆应采用45号钢,其化学成分、力学性能应符合GB/T 699的规定。 5.3.1.4 当盆式支座应用于JT/T 722规定的C1~C3腐蚀环境中时,各类支座用不锈钢冷轧钢板及导向挡块上的不锈钢冷轧钢条应采用06Cr19Ni10、06Cr18Ni11Ti牌号不锈钢板;若使用在C4~C5-M的沿海和近海区域高腐蚀环境中,应采用06Cr17Ni12Mo2、022Cr17Ni12Mo2牌号不锈钢板。各牌号钢板的化学成分和力学性能均应符合GB/T 3280的规定。 5.3.2 橡胶 常温型支座橡胶板采用氯丁橡胶或天然橡胶。耐寒型支座橡胶板采用天然橡胶或三元乙丙橡胶。密封圈采用三元乙丙橡胶。高阻尼橡胶圈采用三元乙丙橡胶。以上各种胶料均不应采用再生橡胶和硫化废弃物,其最小含胶量不应低于重量的55%。支座用橡胶板胶料物理机械性能见表2。橡胶板成品芯部胶料的物理机械性能可低于表2规定的指标,但硬度变化不应大于10%,拉伸强度下降不应大于15%,扯断伸长率下降不应大于30%。 表2 支座用胶料物理机械性能 指标 橡胶板 密封圈 高阻尼橡胶圈 氯丁橡胶 天然橡胶 三元乙丙橡胶 三元乙丙橡胶 三元乙丙橡胶 硬度(IRHD) 常温型 60±5 60±5 60±5 50±5 50±5 耐寒型 50±5 拉伸强度(MPa) ≥17.5 ≥17.5 ≥15.2 ≥12.0 ≥10.0 扯断伸长率(%) ≥400 ≥450 ≥350 ≥350 ≥550 脆性温度(℃) ≤-40 ≤-55 ≤-60 ≤-60 ≤-60 恒定压缩永久变形(%) ≤25 ≤30 ≤25 ≤25 ≤60 耐臭氧老化 臭氧浓度 (100±10)×10-8 (25±5)×10-8 (100±10)×10-8 (100±10)×10-8 (50±5)×10-8 表面状态 无龟裂 无龟裂 无龟裂 无龟裂 — 热空气老化试验 硬度变化(IRHD) <+10 ±10 <+10 <+10 -5~+10 拉伸强度降低率(%) <15 <15 <15 <15 -15~+15 扯断伸长率降低率(%) <40 <20 <40 <40 -20~+20 5.3.3 高性能滑板 5.3.3.1 高性能滑板的力学性能不应低于JT/T 901中改性聚四氟乙烯滑板和超高分子量聚乙烯滑板的有关规定,其关键物理机械性能应满足表3的要求。减震型支座应选用改性聚四氟乙烯滑板。 表3 高性能滑板物理机械性能 指标 改性聚四氟乙烯滑板 改性超高分子量聚乙烯滑板 分子量 — ≥900万 密度(g/cm3) 2.00~2.10 0.93~0.98 拉伸强度(MPa) ≥21 ≥30 断裂伸长率(%) ≥300 球压痕硬度(H132/60)(MPa) 26.4~39.6 5.3.3.2 高性能滑板应用5201-2硅脂润滑,在有硅脂润滑的状态下,与不锈钢冷轧钢板摩擦时,摩擦系数和线磨耗率应符合表4的要求。 表4 高性能滑板摩擦系数和线磨耗率及试验条件 项目 技术指标 试验条件 试验温度(℃) 平均压应力(MPa) 相对滑动速度(mm/s) 往复滑动距离(mm) 累计滑动距离(km) 静摩擦系数μs ≤0.010 21±2 45 0.4 — — ≤0.018 0±2 0.4 — — ≤0.035 -35±2 0.4 — — 动摩擦系数μd ≤0.005 21±2 15 — — ≤0.012 0±2 15 — — ≤0.025 -35±2 15 — — 线磨耗率(μm/km) ≤5 21±2 15 ±10 50 5.3.4 5201-2硅脂 5.3.4.1 5201-2硅脂为乳白色或淡灰色半透明脂状物,不应有机械杂质。5201-2硅脂的理化性能指标应符合HC/T 2502一等品的规定。 5.3.4.2 支座在使用温度范围内,5201-2硅脂应保持对滑移面的润滑作用且不干涸,对滑移面材料不应有害,并具有良好的抗臭氧、耐腐蚀及防水性能。 5.3.5 黄铜密封圈 黄铜密封圈应采用供货状态为Y2或M的H62牌号黄铜板材,其化学成分、力学性能应符合GB/T 2040的规定。 5.3.6 SF-1三层复合板 SF-1三层复合板由高密度铜合金板基层、烧结多孔青铜粉的中间层、80%聚四氟乙烯和20%铅(体积比)组成的填充聚四氟乙烯表层烧结而成。SF-1三层复合板应满足下列要求: a) 层间结合牢度按规定方法反复弯折5次,不应有脱层、剥离,表层的填充聚四氟乙烯不断裂; b) 在280MPa压应力下,压缩永久变形量不应大于0.03mm; c) 在65MPa压应力下,初始静摩擦系数不应大于0.02。 5.4 表观与尺寸 5.4.1 不锈钢冷轧钢板 5.4.1.1 不锈钢冷轧钢板不应有分层,表面不应有裂纹、气泡、杂质、结疤等影响使用的缺陷。 5.4.1.2 大吨位支座用不锈钢冷轧钢板宽度如超出市场供应尺寸,允许有一道经过抛光处理的沿轧制方向用不锈钢焊条焊接的对接焊缝。 5.4.1.3 不锈钢冷轧钢板表面加工应符合GB/T 3280规定的8#表面加工要求。 5.4.1.4 不锈钢冷轧钢板厚度为2mm~3mm;长度不大于1200mm时,厚度为2mm;长度大于1200mm时,厚度为3mm。纵向活动支座和横向活动支座侧向不锈钢条厚度均为2mm。 5.4.2 橡胶板 |
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JT/T 391-2019, JT 391-2019, JTT 391-2019, JT/T391-2019, JT/T 391, JT/T391, JT391-2019, JT 391, JT391, JTT391-2019, JTT 391, JTT391 |