MS road earthwork a1

Before using, it must haveapproval notice of openning the pit by the text of Supervision Consultant and notice onmaterial suitability  Embankment rock material Rock fragments and boulde

1 General - 3

2 Quantity - 3

3 Construction Schedule - 3

4 Site Organization Chart - 4

5 Equipment and Workforce - 5

6 Description of Materials - 6

7 Construction Method - 8

7.1 Working Flow - 8

7.2 Construction Method - 9

8 Inspection and Test Plan - 24

9 Safety Control - 25

10 Environmental Control - 25

APPENDIXES Appendix-1 (Soft Soil Treatment Schedule) -

Appendix-2 (Inspection and Test Plan) -

Appendix-3 (Inspection and Check Sheet) -

1 GENERAL

This method statement describes the Road Earthworks including Soft Ground Treatmentwork such as Geo-textile and Prefabricated Vertical Drain including Sand filling and BorrowMaterial (Embankment) which will be carried out in accordance with General SpecificationsDivision 3: “EARTHWORK”

List of document that will be submitted separately is as below:

(1) Working Drawing

(2) Proposal of Material

(3) Subcontractor proposal (if any)

(4) Detailed information of equipment and labor to be mobilized

Estimated quantity (bidding quantity) is as follows But they are only for reference The design quantity will be made from approved working drawings The actual construction quantity will be shown on As-built Drawing

4 SITE ORGANIZATION CHART

Organization Chart is as follow

5 EQUIPMENT AND WORKFORCE

Project ManagerConstruction Manager

Quality Control ManagerSite Manager

GRBCC

Sub-contractor (if any) – Road Earthwork

Project ManagerSite ManagerSite Engineer

OperatorForeman

Worker

Road Earthworks of this project will be divide into five (03) section along alignment plan.Scheduled Machinery to be mobilized for Road Earthwork for each section is as below.

section :1

6 Dump Truck 15~23tons Class as required Earthwork

11 Survey Instruments Auto level, Total station 6 set Survey worksection 2

Source of power

11 Survey Instruments Auto level, Total station 6 set Survey worksection 3

4 Vibration Roller 7 ~ 15tons Class 9nos Earthwork

Source of power

10 Lighting System as required Night work

11 Survey Instruments Auto level,Total station 6 set Survey work

Note:

Above stated quantity of equipments could be changed if any required and necessary

Scheduled workforce to be mobilized for Road Earthworks and detailed information to bedescribe in “Checking record of Equipment and Labor at Site” will be submitted separatelyafter

6 DESCRIPTION OF MATERIALS

The materials will be submitted to the Engineer for approval and material tests inlaboratory will be implemented before commencement of embankment work under theinspection of the Engineer

The general description of Embankment materials is as follows The detailed informationfor materials will be submitted separately as proposal of materials

Description Material Source of Material Borrow material rock or Soil rock pit or Hill Soil

 Embankment soil material

< Tests in laboratory for Borrow material>

- Test for moisture-density relation of soil AASHTO T180-D

(maximum dry density & optimum moisture content)

The frequency of test during construction is in accordance with Clause 3.7(f) underSection 03400 “Embankment Construction” in General Specifications, therefore the testfrequency for Borrow Material cover for each sample lot (with 03 samples) / eachborrow pit, submission and approval shall be required for one (01) sample lot (with 03samples) / 1500m3 of filling soil at site

The testing result of Borrow Material should be used for the classification of soil to beapproved by the Engineer

Borrow material will be chosen how to meet requirements and conditions to fill orbackfill embankment as shown on drawings Backfill materials must not contain organicsubstances such as: leaves, weeds, roots and garbage

Any backfil materials are classified according to soil classification system ( VietnamStandard 5747- 1993 ) belongs to OL, OH or Pt which will not be used Classifiedmaterials like: GW, GP, GM, GC, SW, SP, SM and SC will be approved of suitablematerials provided that they are reasonable and do not separate characteristics Unless ithas other regulations on the drawing of Contract or of other parts, classified materials are

CH, Cl or MH which can be used to embank base

The backfill soil material must be taken from approved source Before using, it must haveapproval notice of openning the pit by the text of Supervision Consultant and notice onmaterial suitability

 Embankment rock material

Rock fragments and boulders with a largest dimension of 80 cm could be used forEmbankment Construction depending on the proposed plan of the Contractor, reviewedand approved by the Engineer

In the case the use of rock fragments and boulders is allowed by the Engineer, thefilling material between the large rock fragments and boulders shall be finer material,composed of rock fragments, gravel, sand or soil, in accordance with materialrequirements

7 CONSTRUCTION METHOD

1 Define construction range

2 Base excavation to designed level

Ispectiom of transport of material and method Inspection of mobilization work of material and manpower Inspection and control of base excavation fraction

Confirmation and Approval of Subsoil layer by the Engineer Top Soil Disposal and Removal of Existing Trees (if any) Acceptance of Construction Items (Demolition, Site Clearing and Grubbing, Removal of Trees)

Acceptance to move to the next construction stage

Demolition (if necessary)

Removal or Diversion Water/

Temporary relocation of stream channel

Confirmation and Approval of the existing condition of watercourses to relative authority and Engineer with working drawing

(B)Preparation Work Confirmation of approved working drawingInspection of Ground Elevation and Location, Material Test

7.2.1 CLEARING, STRIPPING AND DEMOLITION

 Implemeting to mark position, area limit that need felling, cutting grass weeds,grubbing root of a tree, demolishing construction debris and submit SupervisionConsultant before doing next work

 Removing all barrages within construction range ( old culvert, brick, fence ) Allabove materials after being removed will be gathered tidily, when need be, it willbre reused

 Before embankment construction, Contractor will submit writing proposal onconstruction program of testing compact band to Supervision Consultant andEmployer to consider The purpose to define construction equipment line,number of requirement path, humidity control methods

 Tree root holes, holes are created after removing other barrages will be filled bybackfill materials suit technical standard and compact reachs stipulatedcompactness

 Under embankment bed, at this position, regolith and unsuitable materials will beabandoned or designated to compact, all tree roots will be domolished at least50cm under natural ground or at least 80 cm under the lowest pavement layer

 At cutting part, all tree roots, removed trunks are not less than 50cm fromunderfoundation base layer

Soft soil demolition

Inspection of soil conditions after clearing Engineer’s confirmation and approval of soft soil demolition Survey and inspection of soft soil bound

Inspection of soil conditions while demolition Inspection of slope condition while demolition Definition of unsuitable materials or suitable materials while demolition Inspection of drain system (if requiref and necessary)

Inspection and approval of auxiliary soil conditions by Engineer Survey and inspection of positions and level

Backfilling by borrow materials Ispectiom of transport of material and methodBackfilling layer by layer to clearing level of of surrounding area

Inspection of field density testing Inspection of area and level Check and acceptance of construction items Check and acceptance to move to next construction phase

 Removing regolith on areas designated to implement at 20cm depth under initialearth and at least 30cm under the lowest bottom pavement layer and this layerdug-out earth must be isolated other dug-out earth.

 Contractor will fill holes which were born due to disassembling construction ofsuitable materials to surrounding earth plan level, they must be compacted suitsrequirement in design document or direction of Supervision Consultant

 Using safety methods and effective warning for construction area and arrangebeacon at night if need be

 Existing puplic works need confirming with fuctional agencies beforeimplementing the work Plan of removing, demolishing need to have approval ofEngineer and functional agencies

 Bedding surface will be filled and levelled after clearing, removal and demolition

 Regolith of clearing work, kind of material afterwards can be used for slopesodding of earth embankment or delimiter line, will be gathered and stored atsuitable position

 Clearing work, removal, demolition of upper parts will be implemented carefully

to avoid to damage and affect ground bed of embankment

 Cavity and space after clearing will be filled by approved and compacted borrowmaterials

 Water on earth foundation surface will pumped out by sinker pump or temporarysewer

 Morever, the above work will obey regulations according to article 02100- “ Siteclearing” and article 02200- “ Demolition and Removal of existing structures andobstructions” stipulated in construction engineer direction and check andacceptance

 The channels and ditches crossing the area of embankment will be treated asfollows

Check condition of existing Channels and Ditches

Working Drawing for Approval (Relevant Authority)

Diversion outside the area of embankment Clearing & Grubbing ~ Common excavation for installation of temporary drainage

Dry up existing ~ clearing, stripping &

demolition of existing channels and ditches Install temporary drainage on designed location to keep the watercourse

Filling existing channels and ditches with

suitable material, leveling and compaction as

required

Backfilling after installation of drainage with suitable material, leveling and compaction as required

Backfilling void by approved embankment material with inspection.

(up to the Site Clearing Elevation of surrounding area)

Soft Soil Treatment (if any) Embankment work

the Engineer except for Structure Excavation, rock excavation as defined, the removal,handling and proper utilization or disposal of all excavated materials and shaping ofexcavation and preparation of exposed surface of excavation for the entire length of theroadway and approaches, in accordance with these Specifications and the lines, levels,grades, dimensions and cross-sections shown on the Drawings and as required by theEngineer.

(b) Applicable Provisions

The applicable provisions of Section 03000 “Scope of Work and General” shall be readinto and become part of this Clause 2.2.1 “Common Excavation”

(c) Removal or Disposal of Unsuitable Material

When so directed in writing by the Engineer, the Contractor shall remove materialunsuitable for use in the embankment and shall dispose of it as provided in Clause 2.2.3

"Excavation of Unsuitable Material" Where the excavation reveals a combination ofsuitable and unsuitable materials the Contractor shall unless otherwise agreed by theEngineer, carry out the excavation in such a manner that the suitable materials areexcavated separately for use in the Works without contamination by the unsuitablematerials When unsuitable material below subgrade level in cut or below embankmentfoundation level is ordered to be removed, the soil left in place after the removal of theunsuitable material shall be compacted, to a depth of 20 cm, to a density of 92 percent ofthe maximum dry density determined according to AASHTO T180-D or as instructed bythe Engineer Payment for such compaction and testing shall be included in the unit ratefor Common Excavation

7.2.2.2 Rock Excavation

a, Description

Supervision Consultant defines that rock excavation works are all materials which need toapply blasting or use mental chisel and about –sledge, or use air drill to demolish part whichcan not unearth and can not scarify soil to average depth of 300mm by a 300 HPminimumhorse power bulldozer ( operation weight not less than 40 tonnes ), with high capacitybulldozer, Rock excavation not including ashlar that has size smaller than 1c.m

b,Rock excavation method

 Rock excavation method is carried out as follows :

 Plan preparation

 Positioning bore hole

 Defining bore hole depth

 Drilling hole by soil auger

 Clearing, bathing, checking and accepting bore hole

 Passport charge

 Warning of shooting mine, checking blast site

 Treating umbral blast holes

 Transporting ,treat oversize stone according to technical requirements

When demolishing rock, do not spatter and create road section according to design, so weshoot mine according to blast method with suitable diameter By this method, after blast, soil androck is fractured, broken into clots and lay autochthonously and earth is cambered.

Construction of demolishing rock is applied as current regulations

Using soil auger to drill small holes then, drilling vertically to demolish of creating degrees, atposition adjacent to external road blanker to create side slope, we use side tracked hole

Layout of bore hole of putting explosive and calculating explosive quantity as way of blast

c.Carrying out construction

Plan removal, using manual methods combines with sawing machine to cutting withinconstruction range to ensure construction not to discontinue Banning people who are notresponsible come to blasting area and temporarily discontinue transport go through in short time

to blast to ensure absolutely safety

Defining position of blasting rock, use soil auger to drill holes according to shop drawing.Arrange according to apricot blossom, anomaly among on construction area about (1,0 – 1,5 )Wand anomaly among holes b =0,85 W in which W: smallest coerce road.Two hole rows along bentcan arrange intended blasting bin lays close edge and vallum of bent

Height of each rank H = 1-3m Arrange outerest hole row to ensure for smallest coerce road W <

H normally W = (0,4 – 1,0 )H At positions has acclivous topography, horizontal profile L toeconomize explosive and take use of drop rock gravity load when it fall to drill hole horizontally

In order to create slope we can arrange squint

After blasting, mobolize lorry and excavator transport out of construction plan, createfollowing free surface for next blasting circle to ensure for traffic

Finishing to create shape, size design

After blasting, we use manual method or hammer drill to create size as design

 When meeting rock, rock area will be divided into cross section as soon as cap rock iscut and disposed Bound between rock and soil is approved from SupervisionConsulting and Contractor

 When meeting rock, new slope stake will be set out on the top of rock slope as shown

on typical section or as defined after redesigning Contractor have to design and carryout construction of cutting sloping and other next steps are implemented evenly andsteadily

 Contractor have to excavate rock, ashlar according to intended level and design indrawing Contractor will chose the most effective of excavating rock, for example,shooting mine, using compressed air drill and ripper Contractor must have licensefrom appropriate authorities for shooting mine and meet the demand of thoseauthorities

 Rock ramp will be cut out in advance if Supervision Consultant requires Contractormust have plan on diameter, distance and load cut out holes in advance to havebreaking point, and drill cut out hole in advance total depth of cut.

 Contractor has to demonstrate to Supervision Consultant through testing section 30 m

is diameter, distance and load in accordance with permitted external sloping

 In order to have stable and safe rock cutting, Contractor must split scale and prepareslope, demolish all debris and broken rock Contractor also have to demolishprotruding rock because it is very dangerous for road user If Supervision Consultantrequests, Contractor must demolish all debris and broken rock which lay outside sloperange pile

 Not less than two weeks before starting activities of shot-hole drilling or at any timeContractor propose to change shot-hole drilling method, Contractor have to submitSupervision Consultant blasting plan to consider Blasting plan must tell fullinformation on diagram and shot hole drilling control, Contractor proposes twomethods of control blasting and producing blast Blasting diagram containsinformation as follows:

1 Proposing blasting station scope

2 Plan and general section of proposal drilling model including free surface, burden,blast hole distance, blast hole diameter, blast hole angle, hoist height and drillingdepth

3 Loading diagram shows kind and quantity of explosive, detonator, used initiator

4 Process of starting blast hole including delay of time and system

5 Data sheet of manufacturer of explosive, detonator, initiator wil be used Blastingdiagram consideration of Supervision Consultant will not reduce contractor’sresponsibility on accuracy and suitability of plan when it is implemented on site

 Shooting mine must obey safety norm on blasting work is issued by State

 Only allow to implement to shoot mine when finishing safety preparation work andhaving shooting mine licence of appropriate authorities, in which including :

 Preserving and supplying explosive safely

 Preserving, equipment construction safely in dagerous area

 Protecting dangerous area, it has road signs, radar tracking station, commandstation within bound limit of blasting area

 Inform local authorities and the people in advance before blasting and explaininghome signal