{"id":4625,"date":"2026-06-26T01:14:33","date_gmt":"2026-06-26T01:14:33","guid":{"rendered":"https:\/\/www.railgrindingwheel.com\/?p=4625"},"modified":"2026-06-26T01:42:36","modified_gmt":"2026-06-26T01:42:36","slug":"%e3%81%aa%e3%81%9c%e9%ab%98%e9%80%9f%e9%89%84%e9%81%93%e3%81%ae%e7%b7%9a%e8%b7%af%e3%81%ab%e3%81%af%e4%bc%b8%e7%b8%ae%e7%b6%99%e6%89%8b%e3%81%8c%e3%81%aa%e3%81%84%e3%81%ae%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.railgrindingwheel.com\/ja\/%e3%81%aa%e3%81%9c%e9%ab%98%e9%80%9f%e9%89%84%e9%81%93%e3%81%ae%e7%b7%9a%e8%b7%af%e3%81%ab%e3%81%af%e4%bc%b8%e7%b8%ae%e7%b6%99%e6%89%8b%e3%81%8c%e3%81%aa%e3%81%84%e3%81%ae%e3%81%8b\/","title":{"rendered":"\u9ad8\u901f\u9244\u9053\u306e\u7dda\u8def\u306b\u4f38\u7e2e\u7d99\u624b\u304c\u8a2d\u3051\u3089\u308c\u3066\u3044\u306a\u3044\u7406\u7531"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4625\" class=\"elementor elementor-4625\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e24271c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e24271c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0584258\" data-id=\"0584258\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d756e57 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"d756e57\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Why High-Speed Railway Tracks Have No Expansion Joints<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74894f2 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"74894f2\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c1de1c elementor-share-buttons--view-icon elementor-share-buttons--skin-gradient elementor-share-buttons--shape-square elementor-grid-0 elementor-share-buttons--color-official elementor-widget elementor-widget-share-buttons\" data-id=\"0c1de1c\" data-element_type=\"widget\" data-widget_type=\"share-buttons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div 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Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__0815c27\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__0815c27\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t<div id=\"elementor-toc__0815c27\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-68cd1ee elementor-widget elementor-widget-image\" data-id=\"68cd1ee\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"391\" height=\"354\" src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators.jpg\" class=\"attachment-large size-large wp-image-4628\" alt=\"Rail Expansion Joint Regulators\" srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators.jpg 391w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Rail-Expansion-Joint-Regulators-300x272.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-13x12.jpg 13w\" sizes=\"(max-width: 391px) 100vw, 391px\" data-smush-webp-fallback=\"{&quot;srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators.jpg 391w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-300x272.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-13x12.jpg 13w&quot;}\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0bea582 elementor-widget elementor-widget-text-editor\" data-id=\"0bea582\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div><div>When high-speed trains run at speeds of over 250 kilometers per hour, the stability and ultra-smoothness of rail tracks are top priorities. Expansion joints create constant impacts between train wheels and steel rails. This not only reduces passenger riding comfort but also limits train operating speeds, intensifies wear on rail heads and wheels (wheels suffer particularly severe damage), and shortens wheel service life. To address these drawbacks, eliminating rail joints is the optimal solution, which is why most high-speed railways adopt <a href=\"https:\/\/www.railgrindingwheel.com\/complete-guide-to-railway-track\/\">continuous welded rail (CWR) tracks<\/a>.<\/div><\/div><div><div>Steel rails expand under high temperatures and may buckle and deform without proper countermeasures.<\/div><\/div><div>\u00a0<\/div><div><figure id=\"attachment_4626\" aria-describedby=\"caption-attachment-4626\" style=\"width: 554px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4626 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures.jpg\" alt=\"Steel rails expand under high temperatures and may buckle and deform without proper countermeasures.\" width=\"554\" height=\"276\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures.jpg 554w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures-300x149.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures-18x9.jpg 18w\" data-sizes=\"(max-width: 554px) 100vw, 554px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 554px; --smush-placeholder-aspect-ratio: 554\/276;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures.jpg 554w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures-300x149.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Steel-rails-expand-under-high-temperatures-and-may-buckle-and-deform-without-proper-countermeasures-18x9.jpg 18w&quot;}\" \/><figcaption id=\"caption-attachment-4626\" class=\"wp-caption-text\">Steel rails expand under high temperatures and may buckle and deform without proper countermeasures.<\/figcaption><\/figure><\/div><div><h2>How to Offset Thermal Expansion and Contraction: Pre-Stretching of Rails<\/h2><\/div><div><div>Pre-stretching technology is a modern innovation used to counteract rail thermal deformation. By applying pre-tensile stress to steel rails, the dimensional changes caused by temperature fluctuations are fully offset, enabling ultra-long rails to operate without expansion joints. Such joint-free tracks are also known as pre-stressed stretched rail tracks.<\/div><\/div><div><div>Pre-stretching technology is not exclusive to high-speed rails. For instance, stay cables on cable-stayed bridges also undergo pre-stretching to stabilize tension variations triggered by thermal expansion and contraction.<\/div><\/div><div><h2>Lock Rails to Sleepers with Fasteners and Anti-Creep Devices<\/h2><\/div><div><div><figure id=\"attachment_4627\" aria-describedby=\"caption-attachment-4627\" style=\"width: 554px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4627 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices.jpg\" alt=\"Steel rails expand under high temperatures and may buckle and deform without proper countermeasures.\" width=\"554\" height=\"273\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices.jpg 554w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices-300x148.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices-18x9.jpg 18w\" data-sizes=\"(max-width: 554px) 100vw, 554px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 554px; --smush-placeholder-aspect-ratio: 554\/273;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices.jpg 554w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices-300x148.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Lock-Rails-to-Sleepers-with-Fasteners-and-Anti-Creep-Devices-18x9.jpg 18w&quot;}\" \/><figcaption id=\"caption-attachment-4627\" class=\"wp-caption-text\">Steel rails expand under high temperatures and may buckle and deform without proper countermeasures.<\/figcaption><\/figure><\/div><div>To restrict free expansion and contraction of steel rails driven by temperature shifts, rail fasteners and anti-creep devices firmly lock rails onto sleepers. This generates internal thermal stress within rails, including tensile force in cold weather and compressive force in hot weather, collectively referred to as temperature force.<\/div><\/div><div><div>The magnitude of thermal stress in continuous welded rails is directly correlated with rail temperature changes. Therefore, a designated fixed rail temperature is specified for rail locking. Construction crews generally lock rails during seasons with average temperatures between the local annual maximum and minimum values. This minimizes internal thermal stress, preventing two critical safety hazards: rail fracture from excessive tension in frigid winters and track buckling or rail displacement from excessive compression in scorching summers, both of which pose severe threats to train operation safety.<\/div><\/div><div><h2>Rail Expansion Joint Regulators: Special Devices for Thermal Displacement Adjustment<\/h2><\/div><div><div>Rail expansion joint regulators serve as dedicated adjustment components. Their core function is to coordinate displacement discrepancies between thermal deformation of long steel rails and beam-end expansion\/contraction of long-span bridges. The devices automatically compensate for thermal deformation of rails on bridges, lower loads exerted on rails and bridge substructures, and safeguard the structural integrity of tracks and bridge foundations.<\/div><\/div><div><h2>Classifications of Rail Expansion Joint Regulators<\/h2><\/div><div><div>Rail expansion joint regulators are categorized under four primary standards:<\/div><\/div><div><ol><li>By operating speed: Two types, including regulators for ballasted tracks on 250 km\/h high-speed railways (supporting mixed passenger and freight transport) and regulators for ballastless tracks on 350 km\/h high-speed railways.<\/li><li>By expansion direction: Unidirectional regulators and bidirectional regulators.<\/li><li>By under-rail foundation: Regulators for ballasted tracks and regulators for ballastless tracks.<\/li><li>By planar shapes of switch rails and stock rails: Linear, broken-line and curved types.<\/li><\/ol><\/div><div><h2>Basic Structural Components of Rail Expansion Joint Regulators<\/h2><\/div><div><div><figure id=\"attachment_4628\" aria-describedby=\"caption-attachment-4628\" style=\"width: 391px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4628 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators.jpg\" alt=\"Rail Expansion Joint Regulators\" width=\"391\" height=\"354\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators.jpg 391w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Rail-Expansion-Joint-Regulators-300x272.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-13x12.jpg 13w\" data-sizes=\"(max-width: 391px) 100vw, 391px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 391px; --smush-placeholder-aspect-ratio: 391\/354;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators.jpg 391w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-300x272.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-13x12.jpg 13w&quot;}\" \/><figcaption id=\"caption-attachment-4628\" class=\"wp-caption-text\">Rail Expansion Joint Regulators<\/figcaption><\/figure><\/div><div>Taking the unidirectional rail expansion joint regulator widely applied on ballastless tracks of <a href=\"https:\/\/en.wikipedia.org\/wiki\/High-speed_rail_in_China\">China\u2019s high-speed railways<\/a> as an example, key components consist of stock rails, switch rails, fastening systems, sleepers or track slabs, and rail lifting devices. The working edge of the switch rail maintains consistent track gauge alignment. Its core operating principle lies in free expansion of stock rails while switch rails remain fixed in position.<\/div><div><span style=\"font-size: 1.7em; font-weight: bold;\">Application of Rail Expansion Joint Regulators in China<\/span><\/div><\/div><div><div>China began large-scale deployment of curved rail expansion joint regulators with cut stock rails in the 1960s, which were installed on landmark bridges including the Wuhan Yangtze River Bridge and Jinan Yellow River Bridge.<\/div><\/div><div><div>Early high-speed railway projects in China imported <a href=\"https:\/\/www.voestalpine.com\/railway-systems\/en\/locations\/voestalpine-turnout-technology-germany\/\">German BWG rail expansion joint regulators<\/a>, which were deployed on major structures such as the Yellow River Extra Large Bridge along the Beijing-Shanghai High-Speed Railway and the Yellow River Extra Large Bridge along the Beijing-Guangzhou High-Speed Railway. These regulators have also seen extensive use on passenger dedicated lines including the Qinhuangdao-Shenyang Passenger Railway and Zhengzhou-Xi\u2019an Passenger Railway.<\/div><div><figure id=\"attachment_4629\" aria-describedby=\"caption-attachment-4629\" style=\"width: 554px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4629 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway.jpg\" alt=\"Rail Expansion Joint Regulators For Qinhuangdao-Shenyang Passenger Railway\" width=\"554\" height=\"329\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway.jpg 554w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway-300x178.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway-18x12.jpg 18w\" data-sizes=\"(max-width: 554px) 100vw, 554px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 554px; --smush-placeholder-aspect-ratio: 554\/329;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway.jpg 554w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway-300x178.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Rail-Expansion-Joint-Regulators-For-Qinhuangdao-Shenyang-Passenger-Railway-18x12.jpg 18w&quot;}\" \/><figcaption id=\"caption-attachment-4629\" class=\"wp-caption-text\">Rail Expansion Joint Regulators For Qinhuangdao-Shenyang Passenger Railway<\/figcaption><\/figure><\/div><div><figure id=\"attachment_4630\" aria-describedby=\"caption-attachment-4630\" style=\"width: 554px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4630 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Zhengzhou-Xian-Passenger-Railway.jpg\" alt=\"Zhengzhou-Xi\u2019an Passenger Railway.\" width=\"554\" height=\"193\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Zhengzhou-Xian-Passenger-Railway.jpg 554w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Rail-Expansion-Joint-Regulators-For-Zhengzhou-Xian-Passenger-Railway-300x105.jpg.webp 300w, 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