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1、Method StatementDocument Title：Construction of Traffic Diversion RoadsDocument No.:EXW-P011-0000-CM-CHE-MT-00068 -Rev.CDName & SignaturePositionDatePrepared By：Technical EngineerReviewed By:Technical ManagerApproved By：Project ManagerRevision HistoryRevisionDateDetails of revisionCA27Apr2014Submit f
2、or approval。CB28-May-2014Comply with the comments from Halcrow dated on 6May2014CC12-Oct-2014Comply with the comments from Halcrow dated on 23-Aug2014CD20Nov-2014Comply with the comments from Halcrow dated on 18-Oct-2014SectionCONTENTSPage1。0Purpose 32。0Scope of Work33。0Responsibilities34.0Permits a
3、nd Licences35.0Sequence of Construction of Traffic Diversion Roads46.0Resources to be used for Construction of Traffic Diversion Roads46.1 Reference46.2 Control， Storage Protection of Specific Materials57。0Detailed method of Carrying Out this Method Statement58.0Quality Control and Requirements109.0
4、Health Safety Considerations109.1 General safety issues109.2Emergency Arrangement119.3 Consents and Permits1110。0Environmental Considerations1210.1 Environmental Aspects1210。2 Housekeeping1211.0Appendices12Appendix A-Risk Assessment Appendix B-Tool Box Talk Appendix CInspection and Test Plan Appendi
5、x D-Checklist FormSection1。0： Purpose This method statementis to describe the procedure and techniques of construction of traffic diversionroads in a safe manner that will satisfy all the requirements。Section 2.0: Scope of WorkThis method statement describes the activities related totraffic diversio
6、n roads, including site clearance（REF：EXWP0110000CMCHE-MT00002）， embankment(REF：EXWP0110000-CMCHEMT00011、EXW-P0110000-CM-CHE-MT-00006）, subgrade(REF:EXWP0110000CMCHEMT00011、EXW-P011-0000-CMCHE-MT00006）, road base(REF:EXWP0110000-CM-CHE-MT-00025）， asphalt work， installation of pole light（REF：EXWP0110
7、000-CM-CHE-MT-00085), traffic signal(REF:EXW-P0110000CM-CHEMT-00096)， installation of sign board， safety barriersand road marking etc。 These activities are covered in separated method statement.Section 3。0： ResponsibilitiesThe work will be carried out by CHEC, headed by the Construction Manager. Con
8、struction ManagerPartially responsible for the construction and arrangement of civil works,in charge of site engineer。 HSE Engineer & HSE OfficerResponsible for HSE on site during construction， coordinate with Site Engineer， infrastructure superintendent. QC EngineerResponsible for quality of struct
9、ure on site during construction， coordinate with Site Engineer， request for Inspection and Testing processes and coordination with the Engineers Inspectors representative。 SurveyorResponsible for survey work and settlement monitoring work on site, coordinate with Site Engineer， the survey request pr
10、ocess and coordination with the Engineers surveyor representative. Site EngineerSite engineer responsible for construction of work， coordinate with HSE Engineer， QA/QC engineer， surveyor, will in charge of foremen， operators, drivers, labours, reports directly to construction manager，request for Ins
11、pection and Testing processes and coordination with the Engineers Inspectors representative， as well as supervisor. Foreman-Directly supervises the work activity on the site and has full control over theuse of the labour, plant and equipment. He ensures that the work is carried out in fullcompliance
12、 with the specification， and in a manner that conforms to the safety requirements.He reports to the Site Engineer when the work is complete and ready for inspection。 All personnel （operators) should be qualified and the relevant certificate should be available.Section 4。0： Permits and LicencesWhere
13、required as per project contract specification， permits licences shall be obtained from relevant authorities prior to start with the related works or activities。Section 5.0: Sequence of Construction of Traffic Diversion RoadsThe sequence of traffic diversion roads as shown in the following chart:Seq
14、uence of Traffic Diversion RoadsSection 6。0： Resources to be Used for Construction of Traffic Diversion Roads6.1 References QCS 2010 HSE plan Project quality plan approved by SC。 Method statements which have been approved by Engineer:Method statement of engineering survey: EXW-P0110000CM-CHEMT00001。
15、Method statement of site demolition and clearance: EXWP011-0000-CM-CHE-MT00002Method statement of soil filling and compaction for road works： EXW-P011-0000-CMCHE-MT-00011Method statement of aggregate road base and subbase:EXW-P011-0000-CMCHE-MT-00025 Approved BC Type-1 and SC Type1 design mixes。6.2C
16、ontrol， Storage Protection of Specific Materials Materials shall be stored and handled as to assure the preservation of their quality and fitness for use in the works. Even after source approval has been given materials may again be inspected and tested before used in the work. Each shipment of mate
17、rials is loaded, should be blocked and securely fasten to avoid damages during transportation。 The important materials should be kept clean away from oil, grease， excessive heat and out of the direct rays of the sun. CHEC shall take all necessary protection measures in the storage, handling and stoc
18、kpiling of materials to prevent contamination of material by test。Section 7.0： Detailed Method of Carrying Out this Method Statement7.1 Preparation prior to work All equipments are tested and suitable for the current work. All the equipment， material， and personnel staff have been prepared in situ。
19、All the equipments are functioning all time. Electrical power will be mainly supplied by generators。 The generators will be available and placed close to the working area.7。2 Permit shall be obtained before commence of work All materials and mix designs shall be approved by Engineer prior to use in
20、construction. All necessary Work permits shall be obtained prior to the commencement of any activity onthe site. Personnel responsible for supervising the Works on site （Engineers/Forman） shallbe aware of the permit to work system and permit shall be valid throughout the entire duration ofthe operat
21、ion。 All equipment to be utilized on site shall have a valid Third Party Certificate. Competent personnel shall be responsible for lifting activities.7.3 Checking of underground utilities Prior to commence of works， underground utilities shall be checking according to as-built， underground detecting
22、 reports etc。 If there is any underground utility in designed area, proper method shall be implemented to protect the utility. Work permit shall be given by specific authority prior to work if any underground utility could have been found on work site。7.4Site Demolition and Clearance Refer to the la
23、test method statement of site demolition and clearance （document no。: EXW-P0110000-CMCHE-MT00002). 7.5Soil Filling and Compaction for Road Works Refer to the latest method statement of soil filling and compaction for road works (document no。：EXWP011-0000CM-CHE-MT-00011).7.6Aggregate road base Refer
24、to the latest method statement of aggregate road base and subbase （document no。:EXWP0110000-CM-CHEMT-00025）。7。7 Asphalt work7。7.1 Supply and Spray of Prime Coat:Prior to lay of the asphalt mix, prime coat of MC-70 medium curing cutback asphalt will be applied toan absorbent roadbase surface which wi
25、ll prepare a treated base as per QCS2010，Clause 5.12 in section 6. The Prime coatpenetrates into the base and plugs the voids and hardens the top and helps hind it to layit to the over laying asphalt course。 Application of prime coat will be as follows： Prime coat will be sprayed over the prepared r
26、oadbase. The application rate will be between 0.75 and1.00lit/Sqm. and the application temperature willbe between 60oC degree and 85oC degree. The prime coat will be cutback bitumen consisting of a 60/70 penetration grade bitumenand kerosene. The residue from the distillation test， carried out to 36
27、0oC, shall be aminimum of 55 （by volume)， as determined by the differencemethod。 If the surface is covered in wind-blown dust or fine aggregate then a power broom will beprovided to remove the materials and clean the area before application of prime coat。 The prime coat will be sprayed by well-equip
28、ped mechanical pump and mechanical distributorfixed with a tanker (truck）.Blotter material will be spread from trucks operated backward so that the wheels will nottravel in uncovered wet asphaltic material。 When applying blotter material to an asphalttreated lane that adjoins a lane that has not bee
29、n treated， a strip at least 200 mm wide alongthe adjoining edge will be left。 The prime coat will be applied to 1/2 of the road width at a time and get a slight overlap of asphalt material along adjoining edges of the lanes. Thick paper will be used to protect the previous application joints and oth
30、er appurtenances。 Traffic will not be permitted on the primedsurface soon than 48 hours after spray of prime coat。 Asphalt mix will be not permitted sooner than 2 hours after application of prime coat material. If there is any excessive blotter material, dirt or other objectionable materials, the su
31、rface irregularities will be corrected before the application of the asphalt mix。7.7。2 Supply and Laying of Base Course: The Asphalt BC Type -1will be used as Base-course which will be mix according to QCSin a fully computerizedAsphalt Mix plant.Asphalt Mix plant shall be approved by SC. The Deliver
32、y will be taken in a dumper truck and all the precautions shall be taken toprotect the mix from the weather during transit. Top of Asphalt will be covered during delivery. Thematerial delivered to site at delivery to the paver shall be not more than 163oC and less than 140oC。 The absolute minimum te
33、mperature will not be less than 140oC。 Then the Asphalt will be laid with auto level Asphalt Paver in designed grade and level. The laid material will be compacted as soon as rolling can be effected without causingundue displacement, while the temperature does not fall below 135oC。 The asphalt cours
34、e will be constructed to design levels and shall be homogeneous andeven surface free from undulations， rises or depressions within the tolerances.7.7。3 Supply and Spray of Tack Coat： Before laying of wearing course the surface of base course mix will be swept clean ofloose material and tack coat wil
35、l be applied as per QCS 2010 specification as mentionedinsection 6 part 5。13。 Tack Coat （slow setting emulsified asphalt, grade SS-1h or CSS1h） will be applied to a previously preparedbasecourse， to provide bond for the wearing course to the full-designated width。 The full width of the surface to be
36、 treated will be cleaned with a power broom to remove dust， dirt or other objectionable materials. Immediately after cleaning the surface, the Tack Coat will be sprayed by wellequipped mechanical pump andmechanicaldistributor fixed with a tanker （truck). Application rate of Tack Coat will be applied
37、 between 0。3 to 0。5lit/Sqm and theapplication temperature will be between 10oC and 60oC as specified and the excessiveapplication of tack coat will be avoided. Besides， the material will not be applied when the ambient temperature is less than 13 C or during rain， fog, dust storms or other unsuitabl
38、e weather。 After application, the surface will be allowed to dry until it is in a proper condition oftackiness to receive the asphalt for wearing course。Until the wearing course is placed， the tack coat will be protected fromdamage.If the tack coat is unavoidably damaged by rain or dust， it will be
39、dry and cleaned again by a power broom, and get inspected by the Engineer again to instruct any further actions。7.7.4 Supply and Laying of Asphalt Wearing Course The Asphalt SC Type -1 will be used as wearingcourse which will be mix according toPart5， Section 6 QCS2010 in a fully computerized Asphal
40、t Mixplant。 The plant is designed， coordinatedand operated so as to continuously produce asphaltaccording to required design mixand requirement of site。 The Delivery will be takenin a dumper truck and all the precautions shall be taken toprotect the mix from theweather during transit。 Top of Asphalt
41、 will becovered during delivery. The material willbe delivered to site at delivery to the paver shall be not more than 163oC and less than 140oC. The absolute minimum temperature will not be less than 140oC. The Asphalt Mix material SC-Type 1 will be laid by asphalt finisher as per design gradeand l
42、evel. The laid material will be compacted as soon as rolling can be effected without causingundue displacement, while the temperature does not fall below 135oC。 The asphalt course will be constructed to design levels and shall be homogeneous andeven surface free from undulations, rises or depression
43、s within the tolerances. The material shall not be applied when the ambient temperature is less than 13oC or during rain， frog dust storm or other unsuitable weather.7。7.5 Spreading and Rolling: The bitumen mix will be feed to pavers by end tipping of truck the equipment of spreadingand finishing of
44、 mixture the sand bitumen will be of an approved mechanical, selfpoweredelectronic controlled floating screed type capable of spreadingand finishing tomixture true to line and grade as required。 Break down rolling will immediately follow the rolling of the longitudinal joints and edgesrollers will b
45、e operated as close to the paver as possible to obtain adequate densitywithout causing un-due displacement. After Break down rolling the intermediate rolling will be started while the paving mix is stillhot.Pneumatic rollers will be used continuously until all of the mix places havebeenthoroughly co
46、mpacted. Final rolling will be performed by tandem rollers while the material is still warm toremove the roller marks by obtaining permission from Engineer。After compaction of final rolling the smoothness density andthickness will be checked andany irregularity in density and thickness will be corre
47、ctedas directed by Engineer.7.8 Road marking and sign boards: Road marking shall be done after finishing the asphalt work to divide the roads into several lanes for traffic use。 The materials used for road markings shall be approved by Engineer. Before painting the markings, surveyors will set out the direction of the marking lines and areas。 Road marking materials will be heated and melted on site and then print manually by brushes。 Necessary traffic sign boards will be
