1.0.1 This code is formulated with a view to unify railway engineering measuring technical requirements and guarantee survey outcome.
1.0.2 This Code is applicable to measurement of newly built rail track, tunnel, bridge and culvert.
1.0.3 As for newly built railway, 1954 Beijing coordinate system shall be adopted. Separated co-ordinate can be used in tunnel survey and bridge culvert measurement.
1.0.4 Elevation system of newly built railway shall adopt 1985 national vertical datum. For special sites without national vertical datum bench mark, other benchmark elevation or independent elevation can be referred to for calculation. When leveling of the whole line is finished, broken height shall be eliminated and be converted into 1985 national vertical datum. It can also be converted into uniform elevation system of the whole line if there are any difficulties.
1.0.5 Measurement accuracy shall be measured by mean square error (standard deviation). Limiting error (limited error) shall be two times of the mean square error.
1.0.6 Triangulation, traversing grade and angular accuracy during tunnel, bridge and culvert measurement shall conform to requirements in table 1.0.6.
1. General provisions
2 Terms and symbols
2.1 Terminologies
3 Line survey
3.1 Traversing
3.2 Primary survey leveling
3.3 Morphometry
3.4 Setting-out of route and point of intersection
3.5 Center surveying
3.6 Final survey height measurement
3.7 Cross-section survey
3.8 Construction re-measurement
3.9 Construction laying-out
3.10 Acceptance survey
3.11 Survey outcome calculation and arrangement
4 Tunnel survey
4.1 General requirements
4.2 The technical requirements of outside-tunnel control survey
4.3 Triangulation
4.4 Outside-tunnel precise traverse survey
4.5 Outside-tunnel vertical control survey
4.6 Inside-tunnel traverse measurement
4.7 Inside-tunnel height measurement
4.8 Construction survey
4.9 Measurement and adjustment of through error
4.10 Acceptance survey
4.11 Result interpretation and technical summary
5 General bridge and culvert survey
5.1 General provisions
5.2 Hydrographical survey of bridge crossings
5.3 Hydrographical survey of Binjiang (river)
5.4 Hydrographical survey of small bridge and culvert
5.5 Simple hydrologic observation
5.6 Topography and section surveying of bridge and culvert
5.7 Bridge and culvert construction line retesting and bridge axis measurement
5.8 Construction leveling
5.9 Pier location and fender pile setting
5.10 Layout survey
5.11 Beam erection and completion survey
6 Complicated grand bridge and importance great bridge measurement
6.1 General provisions
6.2 Hydrographical survey
6.3 Midline and height measurement
6.4 The topographic survey of bridge site
6.5 The section survey of bridge site
6.6 The survey of construction-control triangulation network
6.7 The survey of construction-control leveling network
6.8 The establishment of scale field and the verification of precise-measurement-used steel tape
6.9 Inspection of control measurement
6.10 Construction setting-out and final survey
Annex A Pile: leveling point and signal flag
A.1 The category and size of pile
A.2 Stake-out of pile
A.3 Leveling point
A.4 The stake-out of pile in construction and final survey
A.5 The fixed pile and fender pile
A.6 The pattern and size of signal flag (Figure A)
Annex B The monumentation diagram of control point and the inscription method of signal
B.1 The monumentation
B.2 The inscription on the signals of trigonometric point: traverse point and leveling point
Annex C The general requirements for electro-optical distance measurement
Annex D Explanation of Wording in this Code
