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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JT/T 327-2004 Highway bridge expansion and contraction installation. The following main technical changes have been made with respect to JT/T 327-2004:
——The range of expansion and contraction quantity is adjusted (see Clause 1);
——The term and definition of expansion and contraction body have been deleted (see 3.4 of 2004 edition), and the term and definition of elastic bearing element have been added (see 3.4);
——The classification of expansion and contraction installations is revised and the rubber expansion and contraction installation is deleted (see 4.1.3 of 2004 edition); special-shaped steel single-seam expansion and contraction installations is changed into single-seam modular expansion and contraction installations (see 4.2 of this standard; 4.1.4 of 2004 edition); seamless expansion and contraction installation is added [see 4.1c)]; the types of modular expansion and contraction installations and pectinate plate expansion and contraction installations are refined (see 4.2, 4.3 and 4.4).
——The expression methods of product code are improved, and the structure schematic of the expansion and contraction installation is supplemented (see 4.5);
——The general requirements of expansion and contraction installations are supplemented and improved; the deformation performance requirements are improved (see 5.1.1); the water resistance requirements (see 5.1.2), bearing performance requirements (see 5.2.1) and durability requirements (see 5.2.2) are supplemented;
——The test methods of expansion and contraction installations are supplemented and improved, with the deformation performance test (see 7.1.5), water resistance test (see 7.1.6) and bearing performance test (see 7.1.7) supplemented, and welding quality inspection (see 7.2.4) and coating quality inspection (see 7.2.5) improved.
This standard was proposed by and is under the jurisdiction of the National Technical Committee 223 on Traffic Engineering Facilities (Highway) of Standardization Administration of China (SAC/TC 223).
The previous editions of this standard are as follows: JT/T 327-1997 and JT/T 327-2004.
General technical requirements of expansion and contraction installation for highway bridge
1 Scope
This standard specifies the classification, general requirements, technical requirements, test methods and inspection rules of expansion and contraction installations for highway bridge.
This standard is applicable to the expansion and contraction installations used in highway bridge engineering with expansion and contraction quantity of 20 mm~3,000 mm.
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 193 General purpose metric screw threads - General plan
GB/T 11345 Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment
JB/T 5943 Construction machinery - General specifications for welding parts
JT/T 4 Plate type elastomeric pad bearings for highway bridges
JT/T 722 Specifications of protective coating for highway bridge steel structure
JT/T 1039 Polyurethane plug expansion and contraction installation for highway bridges
JTG D60 General code for design of highway bridges and culverts
JTG D64 Specifications for design of highway steel bridge
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
expansion and contraction joint
gap set in superstructure to gear to the structural deformation of bridge
3.2
expansion and contraction installation for highway bridge
general term of various devices set at the expansion and contraction joints in order to make vehicles pass the bridge deck smoothly and gear to the deformation of bridge superstructure
3.3
expansion and contraction quantity
sum of expansion and contraction deformation of expansion and compressive installation
general term of tension bearing and compression bearing in expansion and contraction installation
3.5
longitudinal stagger
horizontal relative displacement of expansion and contraction installation along the center line of bridge
3.6
transverse stagger
horizontal relative displacement of expansion and contraction installation along the direction vertical to the center line of bridge
3.7
vertical stagger
vertical relative displacement of expansion and contraction installation along the direction vertical to the bridge deck
4 Classification
4.1 Expansion and contraction installations for highway bridge (hereinafter referred to as “expansion and contraction installations”) are classified into the following by expansion and contraction installation:
a) modular expansion and contraction installation, coded as M;
b) pectinate plate expansion and contraction installation, coded as S;
c) seamless expansion and contraction installation, coded as W.
4.2 Modular expansion and contraction installations are classified into the following by the quantity of rubber sealing tape:
a) single-seam ones, coded as MA;
b) multi-seam ones, coded as MB.
4.3 Pectinate plate expansion and contraction installations are classified into the following by the stress conditions of pectinate plate:
a) cantilever ones, coded as SC;
b) simply-supported ones, coded as SS.
4.4 Simple-supported pectinate plate expansion and contraction installations are classified into the following by the relative position of toothed plate of the moveable pectinate plate and the expansion and contraction joint:
a) those with the toothed plate of the movable pectinate plate at one side of the expansion and contraction joint, coded as SSA;
b) those with the toothed plate of the movable pectinate plate crossing the expansion and contraction joint, coded as SSB.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 General requirements 6 Technical requirements 7 Test methods 8 Inspection rules Annex A (Normative) Requirements for the checking calculation of limit state of expansion and contraction installation Annex B (Normative) Test method for deformation performance Annex C (Normative) Test method for water resistance Annex D (Normative) Test method for bearing performance Annex E (Normative) Test method for clamping performance of rubber sealing tape
ICS 93.040 P 28 备案号： JT 中华人民共和国交通运输行业标准 JT/T 327—2016 代替 JT/T 327—2004
公路桥梁伸缩装置通用技术条件 General technical requirements of expansion and contraction installation for highway bridge
a)立面 b)加垫板的立面 c)平面 说明： 1——固定台座； 4——试验台； 2——伸缩装置试件； 5——垫块。 3——移动台座； 图B.1 变形性能试验试件布置示意 B.3.2 试验步骤如下： a) 试验过程中，应采用不超过1mm/s的速度施加纵向位移； b) 在横向错位和竖向错位为零的状态下，使伸缩装置完成一次最大闭合和最大开口；在横向错位取最大、竖向错位为零的状态下，使伸缩装置完成一次最大闭合和最大开口；在横向错位为零、竖向错位取最大的状态下，使伸缩装置完成一次最大闭合和最大开口；横向错位和竖向错位归零，使伸缩装置处于最大开口状态： c) 以25％最大伸缩量为步长，每步变形完成后，静置5min，由最大开口变形至最大闭合，测量变形、变位和摩阻力； d) 上一步骤重复进行3次，测量结果的平均值与5.1.1的要求比较，符合要求为合格； e) 施加最大横向错位，以25％最大伸缩量为步长，每步变形完成后，静置5min，由最大开口变形至最大闭合，测量变形、变位和摩阻力； f) 上一步骤重复进行3次，测量结果的平均值与5.1.1的要求比较，符合要求为合格； g) 横向错位归零、施加最大竖向错位，以25％最大伸缩量为步长，每步变形完成后，静置5min，由最大开口变形至最大闭合，测量变形、变位和摩阻力； h) 上一步骤重复进行3次，测量结果的平均值与5.1.1的要求比较，符合要求为合格。 B.4 试验报告 试验报告应包括以下内容： a) 试件概况：包括对应的伸缩装置型号、试件编号，并附简图； b) 试验机性能及配置描述； c) 试验过程中出现的异常现象描述； d) 完整的试验记录，包括试验评定结果，并附试验照片。 附录C (规范性附录) 防水性能试验方法 C.1 试验条件 试验标准温度23℃±5℃，且不应有腐蚀性气体及影响检测的震动源。 C.2 试件 试件应符合7.1.3的要求。试验前应将试件直接置于标准温度23℃±5℃下，静置24h，使试件内外温度一致。 C.3 试验方法 试验步骤如下： a) 使伸缩装置处于最大开口状态，并固定； b) 对伸缩装置试样进行封头处理，封头应高出伸缩装置顶面30mm； c) 使伸缩装置处于水平状态，注水，使水面高出伸缩装置顶面10mm；若24h后，未出现渗水、漏水现象，则伸缩装置的防水性能符合要求。 C.4 试验报告 试验报告应包括以下内容： a) 试件概况：包括对应的伸缩装置型号、试件编号，并附简图； b) 试验机性能及配置描述； c) 试验过程中出现的异常现象描述； d) 完整的试验记录，包括试验评定结果，并附试验照片。 附录D (规范性附录) 承载性能试验方法 D.1 试验条件 试验标准温度23℃±5℃，且不应有腐蚀性气体及影响检测的震动源。 D.2 试件 试件应符合7.1.3的要求。试验前应将试件直接置于标准温度23℃±5℃下，静置24h，使试件内外温度一致。 D.3 试验方法 D.3.1 试件布置示意如图D.1所示。试验台、固定台座和移动台座应具有足够的刚度，避免对试验结果产生不良的影响。
最大开口状态 a)立面 最不利加载位置 b)平面 说明： 1——固定台座； 4——伸缩装置试件； 2——钢加载板； 5——移动台座； 3——橡胶板； 6——试验台。 图D.1 承载性能试验试件布置示意 D.3.2 试验步骤如下： a) 在试验台座上固定伸缩装置，移动移动台座，使伸缩装置处于最大开口状态并固定； b) 使用钢加载板和橡胶板模拟轮载作用，加载板尺寸采用轮载的着地尺寸； c) 模拟轮载的静力作用时，α取16.7°；以设计轮载Pd的10％为步长，以1kN/s的速度加载，每步加载完成后，静置5min；测量伸缩装置的应力和竖向挠度； d) 上一步骤重复进行3次，测量结果的平均值与附录A的要求比较，符合要求为合格； e) 模拟轮载的疲劳作用时，α取0°；以0～Pd为循环幅，施加2×106次，测量伸缩装置的应力变化情况。并观察伸缩装置是否开裂；若未出现疲劳裂缝，伸缩装置的疲劳性能符合要求。 D.4 试验报告 试验报告应包括以下内容： a) 试件概况：包括对应的伸缩装置型号、试件编号，并附简图； b) 试验机性能及配置描述； c) 试验过程中出现的异常现象描述； d) 完整的试验记录，包括试验评定结果，并附试验照片。 附录E (规范性附录) 橡胶密封带夹持性能试验方法 E.1 试验条件 试验标准温度23℃±5℃，且不应有腐蚀性气体及影响检测的震动源。 E.2 试件 试件宜取0.2m长的组装构件。试验前应将试件直接置于标准温度23℃±5℃下，静置24h，使试件内外温度一致。 E.3 试验方法 E.3.1 试件布置示意如图E.1所示。在试验机的承载板上固定异型钢，使异型钢型腔处于同一水平面上，高差应小于1mm。水平油缸、负荷传感器的轴线和橡胶密封带的对称轴重合。
说明： 1——异型钢； 2——橡胶密封带； 3——水平力。 图E.1 橡胶密封带夹持性能试验试件布置示意 E.3.2 试验步骤如下： a) 以0.05kN/s～0.10kN/s速度连续均匀加载水平力，使水平力加载至0.2kN，持荷15min，观察橡胶密封带是否脱落、是否产生细裂纹； b) 以连续、均匀速度卸载至无水平力，静置5min； c) 重复上述两步骤，加载过程连续进行3次； d) 若3次夹持性能试验均未出现橡胶密封带脱落和细裂纹，则橡胶密封带的夹持性能符合要求。 E.4 试验报告 试验报告应包括以下内容： a) 试件概况：包括对应的伸缩装置型号、试件编号，并附简图； b) 试验机性能及配置描述； c) 试验过程中出现的异常现象描述； d) 完整的试验记录，包括试验评定结果，并附试验照片。
