080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT238.2 PT238.3 PT238.4 PT238.5 PT238.6 PT238.7 PT238.8 • The Quality Management / Quality Assurance (QM/QC) for the tunnelling process, including its reporting system (Non-Conformance Reports and Remedial Work Reports, etc.), • The ring erection data, • Ground surface, ground settlements, • The alignment data, • Display of the geology along the alignment, and statistic evaluations. The data shall be transferred automatically, into the DAVARS. The DAVARS shall allow the Employer and his representatives to execute by themselves, visualisation in any display combination of sensors and data labels. Real time data input a) One set of all data generated by the TBM, the mucking systems, tunnel guidance system and, if applicable, automated surveillance systems, shall be read into the data base at least every ten seconds. b) This data shall be transferred directly by the equipment’s PLC and must not be handled through a secondary data system. c) Procedures, which are controlled and recorded in intervals longer then one hour, shall be introduced into the data base manually by the Contractor on the same day. Accessibility of DAVARS a) The data shall be stored into a project data base, accessible through Internet by the Employer and his authorised representatives at any time. b) The DAVARS shall be kept operational for the Employer from TBM installation in the launch position throughout the project until final acceptance and financial closure of the Project. c) The Employer will receive one electronic copy of the database at the end of the Project. Further Functions of DAVARS a) The DAVARS shall allow printing and emailing of the graphs and reports at any work place while being logged-in. b) The DAVARS shall allow for applying active triggers to arbitrary parameters and connecting the triggers with message functions. Passing the set trigger level shall initiate a notification by email to selected individuals. Real Time Data Management The Contractor shall provide Shift Records using semi- automatic Real Time Data Loggers software for on-line display and in hard copy to the Project Manager, detailing work performed except where otherwise allowed or accepted herein, and integrated with requirements specified elsewhere for erection of precast segments, cavity grouting, and permeation grouting including: a) Date, location, shift and beginning and ending face station. A manual check of the TBM face location shall be conducted on a weekly basis. b) List of personnel by name, classification, and function working that shift. c) List of the number and type of equipment, including amount of and reason for any idle or down time. d) List of all materials used in the work. For every TBM shove or stroke: Thames Water Utilities Limited August 2008 Page 28 of 38
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT238.9 PT239 PT239.1 PT239.2 PT239.3 PT239.4 a) Description of soil or bedrock materials being excavated, including boulders and volume of excavated materials using methods as mutually agreed when not otherwise specified. b) Description of delays and down time longer than 10 minutes, including reason for delay. Include maintenance records identifying the component, component position or number and reason for replacement. c) Description and locations of water inflows, ground loss and other events. d) Cutter, pick teeth and muck system component changes, including time and date of replacement, cutter or component position or number, and reason for change. e) Rates of advance for each hour. f) Hours of actual machine operating time for each shift. g) Max thrust pressure for each shove. h) Ring number at start and end of each shift. i) Type, manufacturer and producer name and number of all ground conditioners used on each shift. j) Volume and pressure of grout pumped behind precast segments on each ring. Results of quality control tests including: a) Volume of conditioner used as applicable for EPBM operations b) Volume of slurry and slurry density, as applicable for SPBM operations GROUTING METHODOLOGY Submittals a) Contractor shall submit to the Project Manager, within 28 days of award of Contract, for review and acceptance, a programme showing the methods and sequencing of placing primary and proof grouting b) The Contractor shall submit to the Project Manager for acceptance within 60 days of the award of Contract a detailed Method Statement of the grouting procedures to be followed during the construction of the tunnel. These details shall include:-mix design, constituents and testing procedures, pumping rates and pressures, means of gauging pressures at the point of injection, proof drilling pattern to be adopted. General a) The Contractor shall design a non-shrink Thixotropic Gel 2 part chemical grout system for Cavity Grouting. b) “Primary Grouting” refers to the initial cavity grouting which takes place during shield shove using a pressure grout system. c) During the first 100m of the tunnel drive, the Contractor shall demonstrate (by proof drilling) the effectiveness of the primary grouting system. d) A leachability test on the set grout shall be performed by the Contractor within 6 months of Contract Award in order to gain approval from the Environmental Agency for its use. Grout Delivery The entire grouting system shall be designed to constantly deliver 1 cum/min throughout the complete ring grouting cycle. Primary Grout Injection Thames Water Utilities Limited August 2008 Page 29 of 38
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080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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