-Statement-for-Road-Works-(道路施工方案英文)

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1、精选优质文档-倾情为你奉上METHOD STATEMENT FOR ROAD WORKSTABLE OF CONTENTSS.NoDescriptionPage No1.0Scope32.0Permits and Licenses 33.0Methodology (Sequence of Work For Surface Water Drainage Works )34.0Health and Safety315.0Risk Assessment356.0Environment Control397.0Inspection and Testing398.0Supervision Respons

2、ibilities409.0Resources4010.0Drawings and Sketches4211.0Reference Documentation4212.0Attachments431.0 SCOPE The purpose of this Method Statement is to describe the Methodology involved in construction of Road Works in accordance with project technical specifications, international standards and code

3、s, local rules and regulations (QCS-2010). This method statement will cover the following works:v Earth Works Preparation to Road Formationv Granular Sub-base Preparation Worksv Asphalt Works2.0PERMITS AND LICENSES The Permits and License required for commencement of the work shall be obtained prior

4、 starting any site activities, the permits and license shall be obtained from the Following: v Electricity and Water Authorityv Tel-communication Operatorv Municipality Governmentv Ministry of Environmentv Public Work Authority (Roads)3.0SEQUENCE OF WORKS FOR ROADS3.1 Site preparationv Prior to comm

5、encement of work, the contractor shall obtain the relevant work permits from Clientv The contractor shall under take clearing of site in order to remove any existing vegetation; steel, concrete, unused buildings identified for demolition, piping debris, loose windblown sand and otherforeign material

6、s.v All existing structures, foundations, etc. as indicated above shall be entirely demolished, removed, transported and disposed of by the contractor to a debris yard designated by Client. All soft spots left shall be filled with suitable material and compacted as per specification.v Excavated mate

7、rial, if any, and suitable and approved by Client forbackfilling shall be transported and placed in fill areas within the limits of the work. 3.2 Survey and Setting Out3.2.1 Survey Markersv Survey Markers shall be durable, appropriate to location and intended use. v Survey Markers shall be clearly i

8、dentifiable and protected from construction traffic. For installation of a Survey Marker into reinforced concrete, the JVs will ensure that steel reinforcement bars are to be avoided. v Either removable anchors or epoxy adhesive shall be used as the methods of fixing Benchmarks are a particular type

9、 of Survey Markers used in the control of elevation.v Benchmarks shall have a domed surface for unambiguous staff placement. Primary Benchmarks shall comprise a stainless steel bolt securely placed vertically into a concrete slab, or horizontally into a column. v The protrusion shall not pose a safe

10、ty hazard. Survey Markers used for horizontal control shall have an unambiguous point above (or below) which a survey instrument can be precisely centered. v The point shall comprise either a punch mark or the intersection of 2 lines forming a cross. Cross-headed road nail (75mm long) complete with

11、a colored washer shall generally be used as a Survey Marker. 3.2.2 Control Observation, Adjustment and Presentationv Homogeneous horizontal and vertical survey control is required prior to any setting out. Survey control shall evolve from the whole to the parts. Where practical, all survey points wi

12、thin a horizontal survey control network shall be occupied and observed from. v Forced centering techniques shall be used throughout. A round of angular observations shall comprise the mean of observations taken on both faces of the total station. A minimum number of 4 rounds of horizontal and verti

13、cal angles shall be observed at each instrument set up. v For control work, the angular spread of horizontal angles shall not exceed 3 of arc. Distances shall be measured in both directions. All raw data pertaining to each set up shall be electronically recorded. Survey control shall include redunda

14、nt observations. Observation networks shall be processed using the method of least squares adjustment and the resulting residuals to the observations shall be inspected for magnitude. v Any large residuals or error ellipses shall be examined and appropriate remedial action shall be taken. Precise le

15、veling shall be double run using equal back and fore sights at each instrument set up. Leveling sights shall never exceed 30 meters. On the ground surface, the Contractor shall establish stable bench marks adjacent to the site so that the distance between adjacent benchmarks does not exceed 250 mete

16、rs. v Height datum transfer accuracy shall be better than 2mm in a 30m deep shaft. The transfer of height datum shall be by various independent means. azimuth transfer from surface to underground shall be better than 3“ of arc and point transfer shall be accurate to within 2mm. Such transfers shall

17、be by various independent means.v At 3 month intervals, the Contractor shall conduct a complete survey of all existing survey control. A bound, A4 size survey control report shall be submitted to the Engineer for acceptance within 2 weeks of completing the field work.v The convention adopted shall c

18、omprise Station Name, Easting, Easting, Northing and Elevation reading from left to right report shall contain the following information report shall contain the following information: dates of survey, fixed survey control and values, specification of instrumentation used, calibration status of inst

19、rumentation used, observational acceptance criteria, list offinal adjusted co-ordinates findings and conclusion.v Attached to the report shall be the observations (A4 print out of electronic booking sheet or customized spread sheet), adjustment with residuals and station error ellipses, table of dif

20、ferences in mm from previous co-ordinates and elevations (if applicable),a drawing clearly showing layout of scheme and measured quantities and final co-ordinates in tabular form.3.2.3 General Setting Outv The Contractor shall carry out a comprehensive level survey of the Contract area before any wo

21、rk commences on the site that may alter original ground levels.v Pre-computation shall be carried out prior to any setting out. For rail projects, the effects of cant and throw shall be incorporated into pre-computation wherever relevant.v All pre-computation shall be readily available in a spread s

22、heet format for use on site. The method of setting out for each particular element of the work shall commensurate with the required accuracy, the method of construction, and shall be appropriate for site conditions.v In the setting out process, all elevation transfer conducted by leveling shall star

23、t on an established benchmark and finish on a different benchmark. If a significant disclosure is detected, the reason shall be determined and the necessary corrective action taken. v After the erection of the formwork and prior to concreting, a survey check shall be carried out on the formwork to e

24、nsure that the setting out has been done correctly.v A spreadsheet shall be used in all instances to tabulate the difference (or offset) in mm between the actual set out (or as-built) co-ordinates from the design co-ordinates. In cases where the design is an alignment, offsets to the alignment shall

25、 be computed for each surveyed point.3.3Earth Works3.3.1Earthwork Generalv The JV will carry out all earth work in such a manner as to prevent erosion or slips and shall limit working faces to safe slopes and height.v The JV will ensure that all surfaces have at all times sufficient gradients to ena

26、ble them to shed water without causing erosion.v Hauling of material from cuttings or the importation of fill material to the embankments or other areas of fill shall proceed only when sufficient compaction plant is operating at the place of deposition to ensure compliance with the requirements of C

27、lient.v Construction traffic other than that required for the excavation and trimming shall not use the surface of the bottom of a cutting unless the cutting is in Rock or the Contractor maintains the level of the bottom surface at least 300 mm above formation level.v Any damage to the sub-grade ari

28、sing from such use of the surface shall be made good by the Contractor at his own expense with material having the same characteristics as the material which has been damaged.v The JV will arrange for the rapid dispersal of water shed on to the earth works or completed formation during construction,

29、 or which enters the earth works from any sourcev The JV will provide where necessary temporary water courses, ditches, drains, pumping or other means of maintaining the earth works free from waterv The JV will take special care that naturally occurring materials within the site are not rendered uns

30、uitable by his method of working. Areas of cuttings and excavation shall be so worked that rainfall is conducted rapidly away from the exposed material and at times of expected heavy rain that the cutting areas are protected by appropriate methods of working and drainage provisions.3.3.2Classificati

31、on of Earth Work MaterialThe following definitions of earth works shall apply to this and other clauses of the Specification in which reference is made to the definitions:v Top Soil shall mean the top layer of soil that can support vegetation.v Suitable Material shall comprise all that is acceptable

32、 in accordance with the Contract for use in the works and which is capable of being compacted in the manner specified in project Technical Specifications to form a stable fill having side slopes as indicated on the drawings.v Not Suitable Material shall mean other than suitable material and shall in

33、clude : Material from swamps, marshes or bogs; Peat, logs, stumps or other organic matter and perishable and toxic materials; Material susceptible to spontaneous combustion. Clay of liquid limit exceeding 80 and/or plasticity index exceeding 55.v Rock shall mean hard material found in ledges or mass

34、es in its original position, which would normally have to be loosened either by blasting or by pneumatic tools, or if excavated by hand, by wedges and sledge hammers. Rock shall also include all solid boulders or detached pieces of rock exceeding 0.10 m 3 in size in trenches or exceeding 0.20 m 3 in

35、 general excavation.3.3.3Excavation v Excavation will be carried out to the dimensions, lines, levels and slopes as indicated on the IFC Drawings.v If the JV excavates deeper than the depths shown on the Drawings or as instructed by the Client, then he shall fill in such excessive depths with accept

36、able materials to the satisfaction of the Client.v The bottom of all excavations shall be free from mud and water, trimmed clean, protected from the effects of weather and thoroughly compacted and consolidated v The JV will be responsible to excavate to the top of soft or defective soil below the fo

37、rmation level and backfill with Suitable Material. Such backfill will be well compacted in layers of accepted thickness by approved manners and means.3.3.4Cuttings and Cut Slopesv Unless otherwise specified, no portion of the earth cutting shall vary from the specified or ordered formation level by

38、an amount exceeding 150mm.v In the case of cut slopes, no portion of the completed slope shall vary by an amount exceeding 100mm (measured at right angles to the slope).In all cuttings, whether in earth or rock, undulations in the general plane of the slope will not be permitted. Unless otherwise sp

39、ecified, excavation in rock shall extend to at least150mm below the specified formation level and backfilled with approved materials. v Any overhanging, loose or unstable material shall be removed. The excavation shall be so arranged that the working areas are adequately drained throughout the perio

40、d of construction. v In cutting where the strata consists of earth overlaying rock which is required to be cut to a slope of 1 (H): 2 (V) or steeper, the face of the rock shall be given its appropriate slope up to the junction of the rock and earth and the latter shall be stripped to form a bench 90

41、0mm wide and sloped to the gradient as specified.3.3.5Maintenance of Excavated Areav Continuously monitor the dimensions / level of excavation to avoid over Cutting if any accidental over cutting takes place, fill and compact with Suitable material to the desired level. v Remove any undesirable mate

42、rial (vegetation, organic soils etc.)Encountered during excavation and fill with approved granular material.v Take necessary measures to keep the excavation free from water by De-wateringwherever required.v Arrange shoring so that it does not interfere with the progress of work andFunctioning of nea

43、rby facilities as work proceeds, remove the shoring carefully without causingany danger to the excavation.v If any accidental slips or settlement occurs in the excavated area, Properly fill by selected fill or with mass concrete.3.3.6Sloping the Sides of Excavationv Wherever there are chances of sli

44、ding, properly slope sides of Excavation.v Trim the slopes by hand to uniform batters as shown on the IFC Drawings.v Trim any rock or boulder appearing in the face of the slope, and remove italtogether, if it seems unstable.v If any rock is removed, fill the resulting void with compacted material.v

45、Imported Rock Fill shall be clean well-graded quarry waste provided by the Contractor from sources outside the Site. It shall be resistant to weathering, to the acceptance of the Client. v The maximum size particles in the material shall pass through a rigid 200mm square grid and the largest dimensi

46、on of any particle shall not exceed 300 mm. The material shall not have more than 10% of its particles passinga0.75 mm BS sieve.v Fill Material shall mean Suitable Material for backfilling with the exception of Rock and Imported Rock Fillv Special Fill Material shall mean Suitable Material of which

47、at least 95 per cent shall pass a 125mm BS sieve and at least 90 percent shall pass the 75mm BS sieve. Up to 5 per cent of the material may be made up from isolated boulders of maximum dimensions not exceeding half the thickness of the layer of material being placed. Liquid limit not exceeding 35v p

48、lasticity index not exceeding 12(h) Selected Fill shall be well graded granular natural sands, gravel, crushed rock, crushed concrete, well burnt shale or other materialsaccepted by the Client. The material passing a 425 micron BS sieve, when tested inaccordance with BS 1377, shall have a plasticity

49、 index of less than 6%.v Imported Fill Material shall be Fill Material supplied by the Contractor from a source outside the Site and accepted by the Clients.3.3.7 Compacting and Levelling the Fillv During compaction, maintain the M.C of fill material, usually +/- 3 Percent of OMC. IfRequired, add cl

50、ean water to the fill material in order To maintain the necessary M.Cv Achieve minimum density of specified M.D.D. of soil, by using roller / Plate compactor or any other approved equipment.v Around new (or existing remaining) concrete foundations or other Substructures doNot compact by rolling. Ins

51、tead, use mechanical Rammers or plate compactors to Compact the space in vicinity of Concrete structure.v After compaction, level the surface free from undulations using suitable Equipment.3.4 Materials forSub-base3.4.1Fine Aggregate for Sub-Basev Fine aggregate (Passing the 4.75 mm sieve) shall con

52、sist of crushed mineral aggregate and/or natural sand.v The fine aggregate shall be clean and free from organic matter, clay balks and other extraneous or detrimental materials.v The ratio of aggregates passing the 0.075 ram sieve shall not exceed 66% of the portion passing the 0.425 mm sieve.v The

53、material passing the 0.425 mm sieve shallhave a maximum liquid limit of 25% and the plasticity index shall not exceed 6%.Where the source of fine aggregate does not meet the above requirements, with the Engineers approval, add fine aggregate and filler to correct the gradation or to change the chara

54、cteristics of the material passing the 0.42 mm sieve so as to meet the requirements. Such additional material shall be added in a manner which ensures a completely homogeneous material3.4.2Coarse Aggregate for Sub-Basev Coarse aggregate (retained on the 4.75 mm sieve) shall consist of crushed stonec

55、rushed gravel with minimum of 50% by weight having at least one fractured face.v The flakiness index of the aggregate shallnot exceed 35% when tested in accordance with BS 812.v The Los Angeles Abrasion Loss, as defined by ASTM C131/C535, shallbe 40% maximum.v The aggregate type for the sub-base sha

56、ll be crushed limestone.v The coarse aggregate shall be hard and durable and free from organic matter, clay and other extraneous or detrimental materials.v Coarse aggregate shall have a maximumloss of 20% by the magnesium sulphate soundness test when performed as per ASTM C88 for 5 cycles.v The mini

57、mum CBR value obtained when preparing samples of aggregate base and aggregate Sub-base at optimum moisture content and at 100% relative compaction and soaking them for 4 days shall be 80% and 60%; respectively. The maximum permitted swell shall he 0.5% and 1.0%; respectively3.4.3 Mix Design for Sub-

58、basev Aggregates sub-base shall consist of crashed mineral aggregates or natural mineral aggregates of the designated gradation and thickness.v The maximum dry density and the Optimum moisture content of the material shall ascertained as per the test procedure given in CML 12- 97 andthis shall be us

59、ed to assess the degree of compaction of the mix after rolling170-7.5.66v The pavement layer designated as sub-base, the material shall conform to Class B or Class Cv The particle size shall be determined by the washing and sieving method of BS 812: Part. 103.v Fine and coarse aggregates for sub-bas

60、e shall be combined gradation of material that meets the requirements of the specification for density and other properties,v The aggregate bases shall conform to the class A or class B gradation and the aggregate sub-base shall conform to the class C gradation, as given in the following Table:BS Si

61、eve mPercent PassingClass AClass BClass C36100-5090-100100-37.560-9070-100-2524-7755-851002035-7050-8090-1001026-6040-7050-85515-4030-6035-652.3610-2620-5025-500.4255-1510-3015-300.0752-195-155-15v Immediately comply with such instructions without being entitled to any indemnities or extensions as a

62、 result of such instructions. Any equipment or plant shall not be used beforeobtainingthe approval of the Client and to engage skilled And trained operators, mechanics and labour to carry out the works.3.5 Plant Generally v The machinery and tools used in constructing the various items involved in a

63、sphalt works shall be in good workingcondition and free of oil and fuel leaks This various items shall be maintained and preserved for the whole duration of the work. The Client shall approve the machinery and tools before works begin and supply of suchmachinery with adequate quantities in order to

64、execute the work with due speed andprecision.v For the Client if required, the manufacturers catalogues, specifications and other published data for the equipment and machinery shall be supplied.v On first erecting a batching plant and at least once each three months thereafter, the plant shall be calibrated by a calibration service organization approved by the Central Materials Laborat