Point location movement control method of CPIII point on long-span continuous beam of high speed railway

A technology of high-speed railways, control methods, applied in the direction of roads, measuring instruments, measuring devices, etc.

Active Publication Date: 2012-01-04
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for solving the problem of moving CPIII points on large-span continuous beams of high-speed railways. Using the linear characteristics of bridge telescopic deformation, the coordinates of CPIII points are corrected by measuring the amount of telescopic deformation of the beam body. Guarantee the absolute and relative accuracy of CPIII control points

Method used

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  • Point location movement control method of CPIII point on long-span continuous beam of high speed railway
  • Point location movement control method of CPIII point on long-span continuous beam of high speed railway
  • Point location movement control method of CPIII point on long-span continuous beam of high speed railway

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Embodiment

[0031] When measuring a bridge:

[0032] During CPIII plane net measurement, the length data of beam joints at specific points are measured, see Table 1;

[0033] When the track at CPIII point is finely adjusted, measure the length of the girder joint at this location again, see Table 2;

[0034] Table 1. Length data of girder joints measured during CPIII plane net measurement

[0035]

[0036] Table 2. Length data of girder joints during fine adjustment of the track at CPIII point

[0037]

[0038] At this time, the length change of the beam joint is:

[0039] ΔS 左 =463.92-453.92=10mm;

[0040] ΔS 右 =360.22-350.22=10mm.

[0041] Under the absolute dominance of the linear expansion and contraction of the beam, it is assumed that S 小里程 for 400 meters, S 大里程 If it is 300 meters, the expansion and contraction amount of the continuous beam is calculated according to formula (1) and formula (2) to be about 5.71mm and 4.29mm:

[0042]

[0043]

[0044] The amoun...

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Abstract

The invention relates to the technical field of the measurement of a high speed railway, in particular to a point location movement control method of a CPIII point on a long-span continuous beam of the high speed railway. Because the CPIII points are evenly distributed on anti-collision walls on the two sides of the railway and the anti-collision walls become deformed along with the bridge beam, the CPIII points are driven to move; and when a free station crossing method is used for fine adjustment of the railway, the error accuracy for the station reaches centimetre level and is far more than the tolerance requirement of 2mm, and the measurement accuracy cannot be effectively guaranteed, so that the achievement thereof cannot be used for the fine adjustment of the railway. The method forsolving the problem of the point location movement of the CPIII point on the long-span continuous beam of the high speed railway indicates a method for determining the plane coordinate variation of the CPIII point by determining the length variation of a big beam slot on the continuous beam. The method corrects the coordinate of the CPIII point location by using the expansion of the big beam slotand the azimuth of the section before and after the measurement so as to ensure the accuracy of the CPIII control point and is suitable for the bridge beam with any span.

Description

Technical field: [0001] The invention relates to the technical field of high-speed railway measurement, in particular to a CPIII point movement control method on a large-span continuous beam of a high-speed railway. Background technique: [0002] Some CPIII control points of the high-speed railway are set on the bridge, but the bridge will expand and contract with the change of temperature. The CPIII points on the bridge are arranged on the anti-collision walls on both sides of the track, and the anti-collision walls will deform together with the bridge. Therefore, the CPIII point is driven to move, and the coordinates of the CPIII point at the expansion joint of the girder away from the fixed bearing end of the bridge have the largest change. When the free station intersection method is used for the fine adjustment of the track, the error accuracy of the station setting reaches centimeter level, which is far greater than the tolerance requirement of 2mm. , the measurement a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B35/00G01B21/02
Inventor 任晓春王世君武瑞宏
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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