A construction method of line locking welding and heat treatment integrated operation
A technology of line locking and construction methods, which is applied in the field of rail welding, can solve problems such as endangering traffic safety, and achieve the effects of safe construction, reduced construction difficulty, and reliable quality
Inactive Publication Date: 2015-10-21
SOUTHWEST JIAOTONG UNIV +1
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Problems solved by technology
[0005] In particular, when the aluminothermic welding process is improperly selected, welding defects will occur, and it will be more prone to early damage and breakage of the joint weld, which will further endanger driving safety.
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Embodiment Construction
[0043] The present invention will be further described below in conjunction with accompanying drawing:
[0044] 1. Standard working procedures for welding rails: rail sawing, rust removal, end grinding, rail pulling, welding, blast cooling, heat treatment under pressure, straightening, finishing, flaw detection.
[0045] 2. Construction rail temperature: The construction rail temperature is not greater than the design rail temperature. If the construction rail temperature is higher than the design rail temperature, it is necessary to add technical measures for auxiliary cooling.
[0046] 3. On-line locking welding of unit rails not less than 1,000 meters in length is carried out using a pneumatic rail welding car.
[0047] 4. Determine the length of the construction section of locking welding 3: according to figure 1 For curve and rail temperature difference parameters, it is preferred to select the segment length L range where the bending amount ΔB is equal to 0.
[0048] ...
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The invention provides a line locking welding and heat treatment integrated operation construction method, belongs to the technical field of online welding of steel rails, and is capable of solving the problem of instability of existing replacement construction and online locking welding technologies. According to the rail welding standard operation process, two zones for locking welding and pulling locking are formed, and the welding zone and the pulling locking zone in front of the welding zone can be constructed independently; according to a selected zone length L and a rail temperature difference, a corresponding pulling quantity delta L can be obtained, and rails are directly pulled for locking welding; during construction, fasteners in a range of 20 m from steel rails at a static end should be completely removed, gauge rods are used for locking the steel rails, and special rail cushion devices are placed under the steel rails, so that a line is elevated to produce a downward slope 1% of an original line. A rail welding vehicle climbs to a station and enables the steel rails at movable and static ends to be aligned, an air-pressure rail welding machine falls, and construction operations of rail pulling, welding, air blast cooling and pressure-maintaining heat treatment are sequentially completed through one-time clamping. The operation construction method is mainly applied to online welding of the steel rails.
Description
technical field [0001] The invention relates to the technical field of rail welding, in particular to a construction method for line locking welding of a pneumatic welding rail car at one time. Background technique [0002] At present, my country's existing railway lines are replaced with 1,000-3,000-meter long rails of seamless lines, and lock welding and closing lock welding are performed online, as well as online joint welds, ruts, broken rail repairs, and daily rail replacement. , due to the lack of key technology and equipment for on-line welding construction, the aluminothermic welding method and process had to be used for rail welding. [0003] According to the plane position of the line (curve radius), there are two ways to change the line: manual and mechanical. The manual rail changing method is used less and less in overhaul construction due to the large amount of manual labor, high labor intensity, personal injury accidents prone to occur during the construction ...
Claims
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IPC IPC(8): E01B31/18
Inventor 戴虹许建明徐其瑞黄正中王淑鹏杨明周世恒张炜刘国用
Owner SOUTHWEST JIAOTONG UNIV