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Method for controlling cracks of double-block type ballastless track bed slabs

A control method and technology of ballastless track, applied in the direction of track, road, ballast layer, etc., to achieve the effect of cost saving, improvement of crack occurrence and improvement of construction quality

Inactive Publication Date: 2014-02-26
CHINA TIESIJU CIVIL ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double-block ballastless track bed slab crack control method to solve the problem of reducing ballastless track bed slab cracks in the construction process, and to provide safe, economical and fast guarantee for the operation of trains

Method used

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  • Method for controlling cracks of double-block type ballastless track bed slabs
  • Method for controlling cracks of double-block type ballastless track bed slabs

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Embodiment

[0039] 1. Concrete pouring technology

[0040] Before concrete pouring, the supporting layer and sleepers should be moistened to ensure that the supporting layer and sleepers are completely wet, and there should be no obvious water accumulation. If the concrete is not wetted with water, the concrete will lose water at the contact position between the concrete and the supporting layer and the sleeper, resulting in inconsistent shrinkage of the concrete in the early stage. Cracks occur. In order to reduce excessive vibration, the concrete of the track bed slab cannot be poured at one point, and the vibrator is used to drive the material, but should be poured back and forth between the double-block sleepers in a zigzag route, otherwise the concrete on the surface of the track bed slab after pouring will segregate and appear laitance , resulting in inconsistent shrinkage and cracks.

[0041] 2. Concrete vibration technology

[0042] During the concrete pouring process of the dou...

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Abstract

The invention discloses a method for controlling cracks of double-block type ballastless track bed slabs. The method includes steps of pouring concrete back and forth among double-block type sleepers according to 'Z'-shaped paths; vibrating the concrete, in other words, performing a secondary vibrating process in procedures for pouring the concrete of double-block type track bed slabs according to slump and the initial setting time of the concrete, performing press polish on plastered surfaces, performing rough screeding by the aid of wood float after the concrete is filled into forms, secondarily plastering the surfaces 2 hours after the concrete is filled into the forms, and performing tertiary press polish on the plastered surfaces 4 hours after the concrete is filled into the forms; loosening vertical screw adjusters, fish plates and fasteners, in other words, loosening vertical adjusting screws 4.5 hours after the concrete is plastered on the surfaces, loosening the corresponding fish plates from two sides of a pouring starting end, timely loosening the fasteners by the aid of a bolt fastening machine after bolts of the fish plates are loosened, and removing connection; spraying maintenance liquid. The cracks of the ballastless track bed slabs can be reduced in construction procedures, so that trains can assuredly run safely, economically and quickly. The method has the advantages of simplicity in process, convenience in operation and easiness in construction. Besides, the construction quality of the ballastless track bed slabs can be improved.

Description

technical field [0001] The invention relates to a crack control method for a double-block ballastless track bed slab, in particular to a crack control method for a CRTS Ⅰ double-block ballastless track bed slab. Background technique [0002] At present, during the period of rapid development of my country's high-speed rail, rapid passenger transport between provincial capitals and large and medium-sized cities, and the planned "four horizontal and four vertical" express rail channels are all under construction climax. The cracking of the track bed slab has brought inconvenience to the operation safety and maintenance. [0003] In the construction process of ballastless track bed slabs, the existing construction technology and process use pump trucks or hoppers for direct pouring of concrete, one-time vibration is completed, and the surface finishing is only performed once or twice. , and sprinkle water during lightening, improper lightening time and arbitrary lightening trow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B1/00E01B3/28
Inventor 王栋张彰孙文俊王礼上官印
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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