13/05/2016. Introductions of Pipe Roof. Focuses. Application of Rectangular Shield Jacking

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1 9-10 May 2016 KL Rectangular shield jacking/tbm and comparison with pipe roof Singapore Society for Trenchless Technology () Focuses Introduction of rectangular shield jacking Comparison of Pipe roof / Rectangular shield jacking (via cases study) Introduction of rectangular TBM Sharing information Application of Rectangular Shield Jacking Advantage of rectangular pipes comparing with circle pipes in constraint Subway (MRT) entrance/exit Urban underground pipeline network tunnels Underground Pedestrians, shops, vehicle pass Underground outlet drain Underground connections between existing buildings Others Ground Existing piling foundations Existing utility pipes Introductions of Pipe Roof Introduction of Rectangular shield jacking Pipe roof form a temporary support for building up of the permanent structure Temporary support formed by pipe roof is not necessary for building up the permanent structure Permanent structure Permanent structure formed by rectangular shield jacking in one operation 1

2 9m 13/05/2016 Factors to be considered for rectangular shape of underground structures Method Factors Conditions (location, soil report etc.) 1.Pipe Roof 2. Rectangular shield jacking 3. Rectangular shield TBM Projects by method of Pipe roof proposed outlet drain under crossing road Schedule Cost Quality Environment protection Project Briefing Site Constraints Project location North Buona Vista Road (Heavy transport zones) Project period 24 Month Project procurement Design and build Viaduct foundation of East and West MRT line CCL (Central Circle Line) Joint Bay Cable Services and Utilities (Sewer line, water, Cables etc.) Project layout, site constraint -1 Section 1-1, Site constraint-1 Site constraints - 1 Project Plan CCL MRT LINE Site constraint - 3 Heavy traffics on road 1 1 4m 5m 54m EW MRT LINE 2

3 Services/utilities layout, Site Constraint - 2 Site Constraint-3 Jacking shaft Joint bay 4m in between D G Receiving shaft Mining below joint bay cables Soil Profile Design Consideration Modelling analysis by 2 D Plaxis 2D 10<N<20 40<N<60 10<N<20 Stability consideration During break out Soil treatment, steel portal frame At break-out During excavation At break through 3

4 During excavation Adequacy of the structural element Steel Piped Roof Pipes Steel Frame Supporting The Piped Roof (support frame at 1.5 meter spacing) Staged Excavation (excavation length is restricted to no more than 3 meter) Steel pipes in the project Diameter of 780mm steel piles,16mm thick 10 Nos of steel pipes on top 6 Nos of pipes on each side Interlock together using steel T- clutches 6 m long steel pipes by full butt penetration welding During Excavation During break through at exit Soil treatment The steel support frame at 1.5 meter spacing Staged Excavation, excavation length is restricted to no more than 3 meter Configurations of pipe roof Steel pipe connections Configuration of the pipe roof drilling sequence T Clutch Details Steel Pipes 4

5 Construction Photos Construction photos Welding pipes Completion of horizontal pipe row at top Completion of Outlet Drain Completion of pipe rows in receiving shaft Installation of entrance frame before mining Monitoring of Settlement Installations of instrumentations Installations of instrumentations at Joint Bay areas Fixing of prisms in CCL below Pipe roof Monitoring of Settlement Predictions 5

6 Monitoring of Settlement Readings from Pipe of L1, Projects by Method of Rectangular Shield Jacking Foshan project Summary of projects by rectangular shield jacking in China S/N Project name Jacking Length (m) Period of construction (Month) 1 Underground Access at Kaiming Street and Medicine Street, Ningbo, Zhejiang 2 X 50 Jun Sept 2006 ( 4 ) 2 4th entrance of Longyang Road Station Shanghai Metro 1x 40.5 Nov Dec 2006 ( 1) 3 5 th and 6th entrance at Qibao Station Shanghai Metro 2 x 56 Jan Mar 2007 ( 3) 4 Exit 4 at Spring Road Station, 9th Line, Shanghai, Metro 1 x 44.8 Apr May 2007 ( 2) 5 Underground access at Zhongshan hospital, Shanghai 1 x 78.5 Sept Feb 2011 ( 4) 6 2 nd Entrance at 7th line, South Chen Road Station Shanghai Metro 1 x 37.3 Aug Oct 2008 ( 3) 7 Exit 3, Bus supporting projects in Pujiang Town 2 1 x 44 Jul 2008 Oct Exit 5, 7, 8 for interchange station Shanghai Metro (New Bay) 2 x ( 56.5m, 43.5 m) Aug Dec 2008 ( 5) (3) 9 3rd entrance at 10th Yin High Road Station, Shanghai Metro 1 x 48 Sept 2008-Nov 2008 ( 3) 10 Nanjing West ancestral hall Lane 1 x 42.2 Nov 2008-Jan 2009 Completed underground connections (3) 11 Underground access at Nanjing Military General 1 x 44 Jan Mar 2009 (3) 12 Pedestrian at Hongwu Road, Nanjing, 1x 43.3 Nov Dec 2009 (2) 13 Underground pedestrian at Simon Street Memorial of Nanjing Water 1 x 60 Dec Jan Foshan, underground space (will be further discussed late) 4 x 60.5 Dec May 2012 (11) (2) 15 Buotou underground pedestrian 1x 65 Nov April 2013 (2) Summary of the projects in case study Project Foshan Dimension (mxm) 4 rows, 6.9 x 4.9 Soil Condition Sand and sandy soil Water table Year of Completion Remark mm settlement Nanjing 3.3 x 5.5 Clay Jacking completed in 16 days Baotou 4.0 x 6.9 Sand Cobbles 1/3 of pipes radius from bottom mm per hour 1.Foshan project - connection of two existing buildings A B B A Project Layout 6

7 /05/2016 Section A-A SECT B-B Tower 1 Tower 2 Road Surface Existing Open drain site constraints -3 Heavy traffic at Road Surface Existing open drain Connection tunnel 4 rows of box jacking 60.4m 70000mm 0.5 to 5m cover, 4 rows of 6.9 mx 4.9m x 60.5m Gap between box = 0.5 m Soil Profile and Site Constraints -1 Underground Services plan (site constraint-2) Utilities Diameter/dimension Depth in the ground (m) Water supply steel pipe 300 mm dia 1.04 Tel com 18 Nos of 600*300 (mm*mm) 1.01 Water supply concrete pipe 800mm dia 1.24 Gas pipes 219 mm dia 0.81 Drainage concrete 4200*2500(mm*mm) 4.37 Sewerage pipes 500mm dia 4.32 Power supply 1200*1200(mm*mm) 0.52 Rectangular Concrete box Presstressed concrete box Construction schedule Line 1 Line 2 Line 3 Line 4 Items Line1 Line 2 Line 3 Line 4 Length (meter) Date of start 9-Dec Mar Feb Apr-12 Date of completion 13-Jan Apr-12 6-Mar May-12 Average spped of jacking (meter /day) Maximum speed of jacking (meter / day) No record source form the construction record by china rail 7

8 累计沉降量 (m) /05/2016 Monitoring of settlement Jacking in the working shaft Receiving shaft Maximum road settlement is around 28 mm Road settlement Detailed comparison via two projects Nos Items to compare Rectangular shield jacking Pipe roof project Remarks 基坑周边地面沉降曲线图 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 时间 (d) 1 Site constraints Heavy traffic above Heavy traffic above Proposed MRT and Mechanical room below (three circles) Existing MRT (two circle line) below 2 Utility constraints Existing drain above Joint bay above the box the box 3 Soil condition Sand and sand soil Clay, Sand and sandy soil 4 Size of jacking section 4 X 6 4 X 6 (ID, m*m) 5 Jacking length(meter) 242 (60.5 X 4 ) 50 similar conditions 6 Construction Period (Month) Including shafts 7 Max Settlement (mm) Max settlement of 28mm in D32, Alert level : + 30mm / -10mm 8 Contract sum (Million) 9 Environment protection No extra space occupancy underground Temporary pipes occupy underground space issue 2. Nanjing project Jacking length 87.7m, ID 3.3m 5.5m,Pedestrians Depth: underground 5.5m Soil condition: Clay Jacking period: 16 Days 8

9 3. Baotou project Soil condition: cobble Pedestrians 70mm per hours, Maximum road settlement -10mm Jacking distance: 63m Special design for Cut head arrangement Soil condition: cobble / sand, 70% of 20mm to 200mm dia sandy stone Jacking distance: 63m Site Process of soil discharge by Soil treatment Original soil Rectangular jacking machine from Yangzhou Guang Xin Jacking force: 14 Nos of 200T, Total 2800T Soil treatment mix tank Discharge soil Hoisting the pipe Jacking in the working shaft Treatment soil (slurry) to prevent the road settlement Soil Screening Pack and ready to use in the rectangular pipe Special Sand/ Soil pump been used during construction Completed jacking pipes Road settlement marks Jacking in process 9

10 Factors to be considered for rectangular shape of underground structures Method Rectangular Shield jacking Pipe Roof Conditions (location, soil report etc.) Schedule Cost Suitable for restricted allowable settlement. More Faster as one operation will be processed in construction Medium (more economical for case of numbers of tunnels to cross) Most suitable when surrounding sensitive to settlement Slower as more process need to be carried out in construction. Higher Quality Satisfied Satisfied Rectangular TBM It had been Practiced in the project at Jining, ShangDong. China, Earlier of It is 4000m in length project for underground multi utilities tunnel. Size of 2.2x2.5(internal dimensions) and 2.7mx3.0m(external dimensions) Environment protection Better Better, however more space will be occupied Application of Rectangular Pipe Sections TBM Rectangular TBM is more efficient for Long distance project (normally greater than 100 meters, especially for utilities tunnel) A: Oval cross section, B: Arch section, C: polygon, D: Rectangular shape which should be proportion for both axes in order to deliver inside the tunnel during process of tunnelling Major elements for Rectangular TBM Pipe section deliver by manipulator and track in the tunnel Manipulator 1. Vertical arm;2 & 7. Pin axle;3. Horizontal arm;4. Connecting arm; 5. Connecting axle;6. Telescopic arm 10

11 Major elements for Rectangular TBM Track wheel for Pipe section Practice of Large size of rectangular jacking in China (Year 2014) Sharing of Information Nos Date Dimension (Wx D) Project location Remarks 1 Mar, m 7.2m Zheng zhou Completed year Mar, m 4.2m Nei meng Completed year Mar, m 5.4m Zheng zhuo Completed year 2014 Lifting and installation of the rectangular pipes Installation of the valve for the spiral soil disposal Pushing ring installation after 1 st pipe location Installation of Intermedium jacking station View from inside the jacking machine 11

12 The largest diameter of jacking projects Shanghai, China 3.5 meter (ID) is normally practiced as maximum size for pipe jacking project in the world record Project completed year 2014 at Shanghai. 50 km Sewer line, 4.1m (ID), 4.6m (OD) concrete pipes (sewer pipe) Project completed year 2014 at Shanghai. 20 km Sewer line, 3.60 m (ID), 37mm thickness steel pipes (water supply pipe) Project : Sewer in Shanghai, China Soil condition: Clay Total length. 50 Km, Machine from Yangzhuo Guangxin, China 9-10 May 2016 KL Thank you gxtunnel1@gmail.com wnmconsultants@gmail.com 12

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