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Ballastless track interlayer crack propagation test device and test method

A technology of crack propagation test and ballastless track, applied in the field of interlayer crack propagation test device of ballastless track, can solve the problems of endangering the operation safety of high-speed railway and lack of research on crack propagation of ballastless track, etc.

Inactive Publication Date: 2020-05-19
CHINA RAILWAY ERYUAN ENG GRP CO LTD +1
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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 ballastless track layer in view of the frequent occurrence of cracks between ballastless track concrete layers in rainy areas in the prior art, which seriously endangers the operation safety of high-speed railways, and the lack of research on the crack propagation of ballastless track Crack Growth Test Apparatus and Test Method

Method used

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  • Ballastless track interlayer crack propagation test device and test method
  • Ballastless track interlayer crack propagation test device and test method
  • Ballastless track interlayer crack propagation test device and test method

Examples

Experimental program
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Effect test

Embodiment 1

[0082] A ballastless track interlayer crack growth test device, such as Figure 1-6 As shown, it includes test pieces 101, 102, a test water tank 3, a steel plate with holes for fixing the test pieces, a water tank bottom plate 5 with welding bolts, and the like. As shown in 2, two mounting feet 3a (welding feet of the water tank) are respectively arranged on both sides of the test water tank, and the test water tank 3 is fixed on such as image 3 On the steel table 4 shown, the nuts pass through the mounting feet 3a and the mounting holes 4a.

[0083] Such as figure 1 The test piece shown includes a test piece base plate and a test piece track plate, wherein steel bars (including first steel bars 2 a and second steel bars 2 b ) are arranged inside the test piece base plate 101 , and the steel bars extend out of the test piece base plate 101 . Will figure 1 The specimens shown were placed in Figure 4 On the bottom plate 5 of the water tank shown, the steel bars protruding...

Embodiment 2

[0089] A test method for crack growth between layers of ballastless track, the steps are as follows:

[0090] S1. Production of test pieces:

[0091] ①Put the steel skeleton in the formwork according to the planned size and fix it, pour the mixed C15 concrete into the base formwork until it is full, and vibrate with a vibrating rod to make the concrete even and dense.

[0092] ② After the concrete pouring of the base plate is completed, place it for one day, and then pour the track slab. Before casting, place the wedge-shaped steel plate used for prefabricated cracks in the crack area of ​​the base plate, stick a layer of tape on the surface of the steel plate, and apply butter for later extraction, and pour C30 Concrete, vibrate until uniform.

[0093] ③When the concrete reaches the initial setting, the steel plate used for prefabricating cracks can be moved to prevent the concrete from bonding with the steel plate. Make 6 test pieces and number them.

[0094] S2. Fabricat...

Embodiment 3

[0102] Such as Figure 1-4 The shown ballastless track interlayer crack growth test device includes test workpieces 101 and 102, a test water tank 3, a steel plate with holes 4 for fixing the test piece, a water tank bottom plate 5 with welding bolts, etc.

[0103] The size of the water tank is 500mm×355mm×150mm. The test water tank is welded by Q235 steel plate, the thickness of the bottom plate is 10mm, and the thickness of the hoarding is 5mm.

[0104] Such as image 3 The size of the steel table shown is 445mm×425mm×5mm. Holes are reserved in the four diagonal corners of the steel table for fixing the test water tank on the upper part. The diameter of the holes is 30mm. Fix the test water tank 3 on the steel table 4 by using the φ20mm nuts through the welding feet of the water tank. Will figure 1 The test piece shown is placed on the bottom plate 5 of the water tank, and the steel bars protruding from the base plate of the test piece and the Figure 4 The welded bolts ...

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Abstract

The invention relates to a ballastless track interlayer crack propagation test device. The device comprises a test water tank and a steel table, wherein a water tank bottom plate is provided with a bottom plate fixing column for mounting and fixing a to-be-tested workpiece, and the exterior of the test water tank is connected with a steel table through bolts. Moreover, the invention further provides a ballastless track interlayer crack propagation test method which comprises steps of pouring a test piece by using concrete; putting the to-be-tested workpiece into the test water tank and connecting the to-be-tested workpiece with a bottom plate fixing column at the bottom of the water tank; adding the water into the test water tank to submerge a joint; connecting the test water tank with thesteel table; carrying out at least one loading test; after each loading test is completed, taking out and drying the test workpiece; after finishing the loading test, taking out the test workpiece, drying, cutting along the crack, and observing the crack propagation condition. In the test process, based on the three-primary-color principle, crack propagation research is conducted through crack interface color changes, and defects that the train load and water coupling effect is difficult to simulate, and interlayer crack propagation is difficult to track are overcome.

Description

technical field [0001] The invention belongs to the field of civil engineering structures, and relates to a test device and a test method, in particular to a test device and a test method for crack growth between layers of ballastless track under the coupling action of simulated train load and water. Background technique [0002] State of the art, defects or deficiencies in the art: [0003] Ballastless track adopts reinforced concrete structure instead of granular crushed stone bed structure, and is widely used in domestic high-speed railways due to its high smoothness, high stability and less maintenance. In the process of operation and service, due to the influence of comprehensive factors such as train load, service environment, and construction human factors, interlayer cracks in ballastless track concrete are more common. This type of crack grows relatively slowly in areas with less rainfall, but grows rapidly in areas with abundant rainfall or poor drainage. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/08
CPCG01N19/08
Inventor 代丰曹世豪杨吉忠林红松冯读贝胡连军陈志辉肖飞知
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD