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WBM road construction

 
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Kaustubh Vaishnav
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Joined: 07 Apr 2010
Posts: 109

PostPosted: Fri May 07, 2010 4:45 am    Post subject: WBM road construction Reply with quote

Dear Sefiens

I need help in preparing a document on 'Procedure for WBM road construction'
for that I have no idead of
1.how prelimnary survey was done ?
2. How HFL of river or flood water is considered?

Plz help me for this.

Kaustubh
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suraj
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PostPosted: Fri May 07, 2010 8:11 am    Post subject: Road Brief Statement Reply with quote

Road Brief Statement
From Records
Roads Works on the Drive ways (Revised)<xml><o></o>
Scope<o></o>
The objective of this statement is to outline the procedures to be adopted to carry out the Roads Works on the Drive ways<o></o>
Sub Grade - 200mm<o></o>
Sub Base Class B-150mm<o></o>
Prime Coat MC 1<o></o>
Base <xml><st1><st1>Course</st1> <st1>BC</st1></st1> Type 1- 80mm<o></o>
Tack Coat<o></o>
Wearing <st1><st1>Course</st1> <st1>SC</st1></st1> Type 1- 40mm<o></o>
References:<o></o>
Site Development Plan<o></o>
Miscellaneous Details 2 (use your reference)<o></o>
Specification (use your reference)<o></o>
Responsibilities<o></o>

The responsibilities regarding the supervising personnel on Site shall be according to Project Approved Quality Plan<o></o>

Project Manager  /  Engineer<o></o>

Shall arrange all materials required through the sub contractor ensure that the activity is carried out according to the contract & Specificationsas well as all quality procedures are strictly adhered to.<o></o>

Project Quality Engineer<o></o>

Shall control & supervise the activity making sure that the work is done according to quality procedures & ITPs & then would proceed for obtaining Company approval <o></o>

Road Engineer  /  Foreman<o></o>

Shall carry out the execution of item physically according to the direction given by Project Engineer as well as Quality Engineer<o></o>

Safety<o></o>
Prior to commence any activity, the labour force shall receive a STARRT Card   /  Toolbox Talk relevant to the operation concerned on the Project Site safety requirements.<o></o>
Necessary measures shall be applied to any process involving a safety risk<o></o>Safety Supervision <o></o>A competent officer shall visit the area daily to assess the safety measures adopted. Any snag observed during the visit shall be notified to the supervisor present who immediately would act to bring the safety measures implemented to an acceptable standard <o></o>
Material (all according to approvals)<o></o>
Approved Sub Base Class B <o></o>

Approved Prime Coat MC1<o></o>

Tack Coat<o></o>

Premixed bituminous binder course and wearing course materials shall be supplied from Approved central batching, mixing & heating plant <o></o>

Method<o></o>
The following sequences shall be involved to do the road work.<o></o>

<o> </o>

Clearing implementation of all services works according to the Project drawings and inspections  /  Approvals completed.<o></o>

<o> </o>

Preparation of the area to be road structured by removing top soil, placing in imported fill material, profiling levels to the Project drawing & compaction.<o></o>

<o> </o>

Applying pesticide treatment if so required.<o></o>

<o> </o>

Application of all pre work items such as construction of kerb stone to included section of detail 2 given on Project drawing Miscellaneous details 2 (ndicate your reference)<o></o>

<o> </o>

Prepared surface shall be inspected by Contractor and Company<o></o>

<o> </o>

Sub base class B material shall be spread on the area in strips of required thickness keeping more than design thickness by 25mm i.e. 150+25 mm<o></o>

<o> </o>

Sub base approved fill material to interlock the class B material shall be spread on the spread material & dry rolling carried out to produce correct profile of the section.<o></o>

<o> </o>

Water shall be sprayed on the surface to have it penetrate into & around all the voids of the spread material & compaction by heavy roller started to densify the whole course.<o></o>

<o> </o>

After required number of passes probably 6 given by 18 to 12 tonne rollers bringing the laid material to the required thickness 150 mm & exhibiting rebound on the surface, the compaction by rolling shall cease.<o></o>

<o> </o>

Density test shall be conducted all according to approved ITPs requirement<o></o>

<o> </o>

Compacted course shall be left for drying in due course, allowing it to be ready to receive Prime Coat MC1. Drying time shall not be less than 48 hours.<o></o>

Prior to the start of the Prime course spreading, any repair observed during visible inspection shall be repaired in rectangular or square shape or as agreed with Company<o></o>

<o> </o>

Asphalt concrete<o></o>

Asphalt concrete shall be laid in widths of drive way roads according to the Project drawing<o></o>

Wearing course thickness being 40mm & that of dense bitumen binder course 80mm<o></o>

Paving works shall be carried out in 2 stages<o></o>

Stage 1<o></o>

Laying & compacting bottom bituminous binder course <o></o>

Stage 2<o></o>

Laying & compacting top wearing carriageway<o></o>

Surface preparation <o></o>

Prior to the application of the dense bitumen binder course, already laid & compacted aggregate base course shall be prepared suitable for this purpose<o></o>

Base course shall be corrected of any deviation more than 13mm from the designed profile at any point & not more than 9mm in 3m on the longitudinal grade at any location by either adding to or removing from the surface the deficient or redundant material respectively to bring the surface to the design shape, watered & compacted in accordance to the specification all as stated above<o></o>

Main Operations <o></o>

The following main operations are involve<o></o>

Re-preparation of aggregate base course surface with water & compaction by pneumatic roller <o></o>

Application of Priming coat & drying out<o></o>

Application of 60mm thick dense binder course<o></o>

Power brooming the completed dense binder course<o></o>

Application of Tack coat & drying out<o></o>

Application of 40mm thick bitumen concrete wearing course<o></o>

Mixing<o></o>

All materials shall be mixed at Approved calibrated & approved Asphalt plant<o></o>

All trucks and other equipment as included shall be readily available for inspection <o></o>

Transportation<o></o>

Material shall be transported from the plant to the planned location in good condition by trucks cleaned of all foreign material & covered with tarpaulin to prevent dust invasion in inclement  /  adverse weather conditions <o></o>

It shall be ensured by obtaining observations using thermometer that the material when laid is within 130 to 1658 C<o></o>

Application<o></o>

Coverage <o></o>

Primer coat  0.8 to 1.4 litre  /   m^2<o></o>

Tack coat  0.4 to 0.7 litre   /   m^2<o></o>

Primer<o></o>
Contractor QC inspections shall be conducted to ascertain the correct profile of the aggregate base course & corrections applied if so required<o></o>

All surfaces planned to be primed shall be barricaded & cleaned of all dirt & any objectionable material<o></o>

Bituminous material shall be applied evenly on the dry surface by means of a pressure distributor spray tanker within a temperature 308 to 70 8C <o></o>
Surfacing<o></o>

Binder Course<o></o>
Contractor QC inspection shall be conducted prior to the commencement of binder course laying to make sure that the surface is satisfactorily clean, well dried & even to the specified priming conditions & to receive binder course <o></o>

The material upon arrival at the location shall be spread & struck off to the prepared profile by means of self powered spreading & finishing equipment attached with a strike off assembly distributing the mixture to a strip 3 m wide<o></o>

Rolling<o></o>

Steel Rollerís # of passes 6 to 8 depending on the surface condition<o></o>
Steel rollers 10 T capacity equipped with adjustable wheel scrapes, water tanks & sprinkling apparatus to keep the wheel sufficiently wet to prevent the bituminous mixture from sticking to the steel surface shall be employed to roll the profiled material immediately after the material is laid to the acceptable profile to prevent the formation of undue displacement or hair cracking<o></o>

The roller wheels shall be kept properly moistened without excess water or oil<o></o>

Rolling shall be commenced from the side and proceed towards the centre each trip overlapping the previous by at least 300 mm with keeping alternate trip not more than 5 km  /  hour & it shall continue until the surface is impression free<o></o>

Mechanical compactors shall be engaged to compact the roller inaccessible area layers<o></o>

Pneumatic tyred rollers shall be engaged only after the compaction by wheel roller is over<o></o>

It is significant to make sure that the asphalt temperature does not fall below 80 8 C  prior to full compaction is achieved<o></o>

Roller shall not pass over the edges of the freshly laid material generally except when the edge is located at a discontinuation for that day<o></o>

Contractor QC inspection shall be conducted throughout the above operations to make sure that the material is compacted to the standards and the temperature remains within limits mentioned as well as levels are maintained within specification tolerances particularly over the areas involving shoulders<o></o>

At the commencement of the work on the area involving the compacted & chilled edge, a bevel shall be cut out, cleaned & tack coat applied to receive adjoining material<o></o>

No traffic shall be permitted until 12 hours lapse post rolling completion<o></o>

Wearing Course<o></o>

The planned surface shall be cleared of all dust & dirt using power broom or blowing<o></o>

Tack coat shall be applied to the specification requirement<o></o>

Immediately upon arrival the material shall be spread & rolled similarly as described in the foregoing<o></o>

Contractor QC inspection shall be conducted throughout the above operations to make sure that the material is compacted to the standards and the temperature remains within limits mentioned as well as levels are maintained within specification tolerances <o></o>

Major Equipment<o></o>
Required for the binder course<o></o>

Central Mixing Asphalt plant 1#<o></o>

Trucks 1 #s 38 Tonnes capacity each<o></o>

Paver 1 #s, 1 # with 6m  /  3m wide blades <o></o>

Steel wheel Tandem Rollers 1 #s, 10 Tonnes capacity, 1# ,15 Tonnes capacity<o></o>

Pneumatic Tired Rollers (tyre inflatable at 0.62 Mpa ) -1 #s 38 T & 1 #s 20 T<o></o>

Air Compressor 1 #<o></o>

Asphalt Cutting Machine 1#<o></o>

Plate Compactor 1 #<o></o>

Jumping Jack Compactor 1 #<o></o>

Spray Tanker 1 #<o></o>

Additionally required for the Wearing Course <o></o>

Power Broom<o></o>

Vacuum Cleaner<o></o>

Attachment<o></o>
ITPs<o></o>

Please refer to for many on many topics
http://www.sefindia.org/forum/download.php?id=1046&sid=158490640705b5bcc455a699286a45a7
<o> </o>

_________________
Thanks & Warm Regards
IntPE(India)Suraj Singh FIE Civil
Engineering & Arbitration

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sspawar
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Joined: 05 Jun 2009
Posts: 1171

PostPosted: Fri May 07, 2010 12:47 pm    Post subject: Reply with quote

Dear Vaishnav
By the way in which department you are working?
In a single stroke you are asking road and bridge both in full.
Ask specific.
If you want to learn whole to become a master then better you have to work hard and gain the experience and knowledge with the time  from your seniors and of course colleagues.

MORTH (Specification for road and bridges from Ministry of road transports and highways) is very prominent book over Road and Bridge specification.
Ministry of road transport has many publications and codes (issued from INDIAN ROAD CONGRESS) called IRC publications.

Regards
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B.V.Harsoda
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PostPosted: Sat May 08, 2010 2:00 am    Post subject: Reply with quote

Refer below link for IRC Publication  details:-



http://www.sefindia.org/forum/viewtopic.php?t=6604&postdays=0&postorder=asc&start=70
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Kaustubh Vaishnav
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Joined: 07 Apr 2010
Posts: 109

PostPosted: Sat May 08, 2010 3:45 am    Post subject: WBM road construction Reply with quote

Dear Pawar sir

I am working with Suzlon Energy Ltd., Pune, Maharashtra,
Dept.- Technical Servises Group-Project Engineering.

Our role is basically provide Design, Drawings, Specification, Work instructions & trouble shooting for Project Engineers on site,
  I have getting calls from various sites in India that every year during mansoon they are getting problem in approching Wind Turbine Foundations for Operation & Maintainance, So I have visited 2-3 sites seen that roads are tempary (LCR), and made without any prelimanry survey, I just want to release doc. giving guidlines for maintance or prepration of roads.
  Anthother thing is there is not posible to make Concrete roads due to cost.
Thanks for your Valuable Guidence.


Kaustubh

sspawar wrote:
Dear Vaishnav
By the way in which department you are working?
In a single stroke you are asking road and bridge both in full.
Ask specific.
If you want to learn whole to become a master then better you have to work hard and gain the experience and knowledge with the time  from your seniors and of course colleagues.

MORTH (Specification for road and bridges from Ministry of road transports and highways) is very prominent book over Road and Bridge specification.
Ministry of road transport has many publications and codes (issued from INDIAN ROAD CONGRESS) called IRC publications.

Regards
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bkkk
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Joined: 25 Mar 2009
Posts: 179

PostPosted: Thu May 13, 2010 10:25 am    Post subject: WBM clarifications Reply with quote

Hi

First you have to take  existing cross section levels and along Longitudinal section .With proposed levels ,compute the volume of WBM. According to requirements WBM is laid in two layers.But WBM is an open Course if left untopped it will worn out rapidly.Hence after reuired compaction is acheived you can lay  wearing course consisiting of premix carpet with a seal coat.But nowadays WBM are being replaced by WMM and  GSB.Hence i suggest you to go for the same.HFL  can be obtained from PWD authorities or you can  take highest watermark in the river bund or on structure as HFL. Please refer MORTH Manual or relevent IRC standards for the specifications.


Er.C.balaji venkateswaran
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