Construction method for improving percent of pass of double-block type concrete sleepers

Abstract

The invention mainly relates to a construction method for improving the percent of pass of double-block type concrete sleepers, in particular to a construction method which is applied to a sleeper structure and used for prefabricating and constructing the double-block type concrete sleepers with stopping shoulders. The construction method includes the steps that internal stress of steel bars is eliminated after the steel bars are made to stand still for a certain period of time; by adjusting the arch bending height and increasing welding points, the instantaneous welding current is reduced, the thermal distortion range of the welding points is reduced, and mold cleaning and quality control over and improvement to spraying of release agents are perfected; the impact force generated when the sleeper is demolded is reduced. The construction method has the advantages that the stress generated in the steel bar cold rolling process is effectively removed, the instantaneous welding current is reduced by increasing the welding points, and therefore the thermal distortion range of the welding portions is reduced, it is avoided that the welding points break away from the welding portions, the impact force generated when the sleeper is demolded is reduced, and the quality of the sleeper is guaranteed.

Description

technical field [0001] The invention mainly relates to a construction method for improving the qualification rate of a double-block concrete sleeper, in particular to a prefabricated construction method applied to a double-block sleeper with a shoulder-blocking sleeper structure. Background technique [0002] The newly-built Daxi Railway Passenger Dedicated Line is a high-speed passenger dedicated line from Datong to Xi'an. It is drawn from the original Pingxi Station, passes through Xinzhou and Yangqu to the south, and then connects to Taiyuan Junction. It is drawn from Taiyuan South Station via Jiexiu, Hongdong, Linfen, and Yuncheng. , crossing the Yellow River in Yongji and entering Shaanxi Province, passing through Dali, Weinan, and Xinlintong to the north of Xi'an. The total length of the main line is 678.4km, the design standard is double-track double-block ballastless track, and the design speed is 350km / h. [0003] Jinzhong Sleeper Field of China Railway Tenth Burea...

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Problems solved by technology

[0004] September 2011 was the first official production month of the Jinzhong sleeper field of China Railway Tenth Bureau Group Co., Ltd., from September 1, 2011 to September 15, 2011, a total of 9,160 double-block sleepers were produced, and the number of unqualified sleepers was 102. Root, the unqualified rate of sleepers is as high as 1.1%, mainly due to the existence of stress generated in the cold rolling process of steel bars, the large range of thermal changes in the welding parts, and the relatively brittle welding points, which makes the welding points weak. Another unqualified reason is the shoulder of the sleeper, Defects in the bearing groove and the corners of the mold or bruises due to the high impact force during the demoulding process not only caused a lot of money loss, but also brought great difficulties to the prefabrication construction of double-block sleepers. Therefore, the traditional It is difficult to achieve the ideal construction effect with the double-block sleeper prefabrication technology

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