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ICKTCM130635 경부고속철도 제7-1공구 노반신설 기타공사 공사시방서(영문) 05장(강재구)(권순천).Hwp

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ICKTCM130635 경부고속철도 제7-1공구 노반신설 기타공사 공사시방서(영문) 05장(강재구)(권순천).Hwp OO High Speed Railway Lot No.O-1 Roadbed Construction PJ Specification - Tunnelling Works OO고속철도 제O-1공구 노반신설 건설공사 공사시방서 - 터널공 1997. 05 - Contents - 1. General 2. Construction survey 3. Rock classification and application of standard section 4. Excavation and mucking 5. Support 6. Steel form work 7. Concrete lining 8. Backfill insert 9. Waterproof and drainage 10. Waterproofing for the open cut type of tunnel 11. Entrance 12. Monitoring 13. Safety and sanitation 14. Chemical grouting 15. Grouting for tunnel reinforcement (Special chemical grouting by polymer urethane) 16. Temporary electric work 제 공 처 국토교통부 출 처 Korea High Speed Rail Construction Authority 1. General 1.1 Application (1) This Specification shows the general standards for tunneling work to be executed by NATM for Seoul-Pusan High speed Railway Construction section. (2) This specification is applicable to construction management and monitoring for NATM. (3) For aspects which are not specified in this specification, the Standard Specification by OHRC and the Standard Specification for Tunnel Construction by Ministry of Construction and Transportation shall be applied. 1.2 Work plan (1) The Contractor shall make a work implementation plan and a work procedure of the specifications according to b, para 6, Chapt. 1 and d, para 3, Chapt 8 of the specifications and proceed to work after the Supervisor's approval. (2) Construction scope and duration and local features and the foundation condition shall be considered in making a work execution plan, and environmental pollution and traffic problem shall be minimized. (3) Cycle time for excavation and auxiliary construction method shall be reviewed in making the work plan. All the procedure shall be executed by teams, and the interrelated work shall be effected immediately between excavation team and the auxiliary construction team. (4) Nozzle men for shotcreting shall be skilled and approved by the Supervisor. (5) In excavation tunnel the Contractor shall check the condition of ground water and original subbase condition more than once a day, and keep a record for such check, and notify the owner's representative. - 1 - (6) During the tunnel construction, the Contractor shall make and keep the tunnel construction record, such timbering works as rockbolt and shotconcrete(tunnel development) and report it to the Supervisor every week, however from time to time if necessary. Monthly report shall be made and submitted to the Supervisor. 1.3 Investigation during construction (1) The Contractor shall check any changes in the site conditions and environment during the construction work. (2) The check lists during the construction shall include the following. (2.1) Geological conditions of the facing : rock quality, joint and ground water level. (2.2) Behavior and condition of the foundation and timbering, and stress. (2.3) Surface settlement and behavior of neighboring facilities. (2.4) Self-supportability and surrounding condition of the tunnel. (2.5) Pilot horizontal geologic survey inside tunnel. Aspect not explored during the subbase survey in the designing stage shall be executed in tunnel construction stage (2.5.1) When significant changes in the bed exist. (2.5.2) When the thickness of covering rock is thin. (2.5.3) The area where underground excavation is impossible due to passing section of obstacles. (2.5.4) When the water permeation condition needs to be checked in the horizontal direction of the subbase. 1.4 Change to construction method (1) When the Contractor considers that the investigation results in design stage are significantly different then the site investigation, and that the original work procedure in not suitable for the site condition, the Contractor shall take temporary measures for safety and change work procedure after reviewing in full detail of rock exploration and measurement values particularly for NATM work. - 2 - (2) The Contractor shall prepare request for change and obtain approval from. the Supervisor before changing work procedure. - 3 - 2. Construction survey 2.1 Survey list The Contractor shall check the central and the longitudinal lines of the tunnel by surveying with higher accuracy not only before the construction but also during the construction to confirm correct alignment from time to time. 2.2 Alignment surrey (1) The survey of alignment shall be executed to confirm that the tunnel is constructed true to horizontal and vertical alignment as designed. (2) To prevent the accumulation of deviation occurring in each excavation, the alignment inspection shall be executed. (3) The alignment confirmation shall be executed by qualified survey engineer, in presence of the Supervisor. 2.3 The control point of outside tunnel (1) The control point shall be installed in order to make the construction control at outside of the tunnel and interrelation defined with precision between those points. (2) The control point should be installed at place where it is not subject to damage, movement and shall be protected. (3) Installation of control point should be made with precision as required, using proper survey method depending upon the length of tunnel, condition of terrain configuration. 2.4 Tunnel survey - 4 - (1) The tunnel station shall be measured with required precision, and shall be installed without subjecting it to any damage or movement during the construction. (2) The distance of station shall be decided considering the alignment, the size of section, and grade. (3) As the excavation proceeds, the survey of tunnel station shall be executed by inspection surveying every month from the control point of outside tunnel. (4) The curved section shall be constructed by center line of structure after surveying track and structure center. 2.5 Survey of inner section and measurement of outbreak quantity (1) For the survey of shaft section, the measuring distance shall be decided for every 5.0m upon the Supervisor's instruction considering the field condition. (2) For measuring the inner section, laser automatic surveying instrument shall be used, and after the accurate measurement of outbreak quantity, the drawing derived from the data should be submitted to the Supervisor. - 5 - 3. Rock classification and application of standard section 3.1 Rock classification (1) The data of domestic and foreign should be reviewed for the rock classification, and applied Rational Classification shall be made in consultation with expert geologist (2) Classification of rock shall be decided considering the rock-quality condition, ground water condition and joint. (3) Rock mass rating system (RMR) used on the field is as follows. (3.1) Standard of classification & Point - 6 - (3.2) Grade calibration chart in accordance with joint - 7 - (3.3) Rock classification by grade of RMR (3.4) Meaning of rock grade (3.5) Effective joint slope of uncontinuous surface for excavation direction - 8 - (4) The classification standard of badrock shall equally apply to whole procedure (design, construction, measurement), which cannot be adjusted without particular reason. (5) The classification standard shall be approved by the Supervisor, reflecting detailed opinion of an expert. 3.2 Application (1) An excavation pattern shall be decided in accordance with the classification standard. (2) The Contractor shall execute face mapping conforming to the proposed standard and submit to the Supervisor for an approval. (3) The Supervisor, when the excavation pattern is changed, shall instruct to proceed construction, and consider it in later design change. - 9 - 4. Excavation and mucking 4.1 General (1) Excavation shall be executed in such a way that the badrock is not slackened as far as possible, and collapse in crown or mine shall be prevented. (2) Outbreak should be minimized by using smooth blasting method. (3) The excavation procedure and sequence in construction shall be checked considering topography, geological condition, water leakage, shape of sectional area and air. An optimum method shall be chosen and approved. (4) Lower part excavation shall be made in such way that it will not affect shotcrete layer and timbering already completed. (5) The construction Contractor shall make general measurement as soon as excavation starts. (6) The center line of excavation shall not be deviated over 5cm from the marked location in design. (7) The construction Contractor shall record the excavation work and submit a copy of the excavation peformed during the preceding date. (8) Drainage, lighting and ventilating in facing shall be managed carefully. 4.2 Extent & pattern of excavation (1) Scale and length of excavation shall be considered with having regard to safety, constructability and economics depending upon bedrock condition. (2) For scale or bench length, cut area shall be fixed according to vibration regulation standard with considerations for bedrock condition and surrounding. 4.3 Outbreak - 10 - The construction Contractor shall minimize outbreaks and the excessive outbrokens shall be reinforced with shotcrete and rock bolt at the Contractor's cost. Except outbreaks are caused by geological, unforeseen reasons. 4.4 Blasting excavation 4.4.1 Scheme (1) Proposed blasting pattern shall be based on the result of boring and computation of theoretical equation. In site blasting, test blasting shall be made monthly as planned and the pattern shall be arranged accordingly. (2) A blasting scheme shall be established after verifying bedrock condition considering one time blasting length, and equipments. For the blasting method, arrangement of boring, kind/amount of powder and type of percussion shall be included in the scheme. (3) Original ground shall not be slackened by checking amount of powder according to joint and the type of soil. (4) Blasting shall be made in compliance with relevant laws and regulations. 4.4.2 Trial blasting (1) Vibration recorder shall be installed in a place where civil complaints is expected near the seismic center to measure the actual vibration. (2) Noise shall be measured also in trial blasting. (3) The adequacy of result shall be generally evaluated whether allowable vibration value is exceeded or not comprehensively evaluating extent of outbreak, muck flying distance and size etc and conduct trial blasting.
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