Industrial Training Report

L&T Construction for Phase III

Barapullah Elevated Corridor in DelhiThe project will connect Sarai Kale Khan and Mayur Vihar through

the elevated corridor across river Yamuna. The scope includes construction of a 550m, 6-lane extra dosed bridge and a 4.3km, 4-lane elevated road, a flyover at Mayur Vihar side, connecting loops, cycle

tracks, road works, architectural lighting and other allied works.

Barapullah Project

Project Content•Precasting of Segment•Pile & Piers Works•Quality Control•Batching Plant

SegmentAbout the segment: 

Speed of erection Crew efficiency High quality Many options Top down erection possible minimal disruption to traffic and surface operations Efficient use of forms

 Type of Segment:S1, S2, S3, S4, S5 & S6

Length of various segment:

S1 : 2.1mS2 & S3 : 2.5mS4 & S5 : 3.0mS6 : 3.0mS6 : 2.375m

 

Reinforcement Of Segment

Cont…

Cont…Dia of Bar Used:

32mm25mm20mm16mm12mm10mm08mm

Cont…Place the R/F as per GFC drawings ensuring the following aspects properly:

a) Type & size of barsb) Numbers of barsc) Location and length of laps, splicesd) Curtailment of barse) In two way R/F, check the direction of R/F in various layersf) Adequate number of chairs, spacer bars and cover blocksg) Size of cover blocksh) All the bars shall be tied with double fold 18 gram soft GI annealed binding wire.

Reinforcement may be placed with following tolerance whenever required:a) For effective depth of 200 mm or less +/- 10 mmb) For effective depth more than 200 mm +/- 15 mmc) The cover shall in no case be reduced by more than one third of the specified cover or+/- 10 mm.d) The cover should suit various cover requirements as per drawing notes.e) All reinforcement shall be placed and maintained in the positions shown in the drawing byproviding proper cover blocks, spacers and supporting bars.

Some Important

Notes Grade of concrete used : M50 Grade of steel used : Fe500D Clear Cover to Reinforcement

Exposed Faces : 40mmInternal Faces : 35mmTop Surfaces : 35mm

Minimum lap length : 44 X Dia. Of Bar Minimum c/c distance b/w two adjacent lap : 1.3 times lap length Curing : 14 days(Min.) Aggregate used : 10-20mm Cement used : OPC 53 Length of one segment : 42m

Method of StatementA method statement is detailing the procedure of casting Various elements of the structure.

It is to be prepared by the contractor and get it approved by the client or their nominated consultants well before starting the construction work at site.

It is a written document, available at site, to be referred by the client and contractor, as and when required by them to ensure availability of required infrastructure and proper sequence of the construction activities, so as to get the work done with desire progress and quality. 

Information About

Equipment• More than 600 piles, both 800 mm

diameter and 1000 mm diameter, were installed for supporting the proposed G+10commercial building with large column heads.

• The piles were in groups of 4 piles to 10 piles.

• Hydraulically operated rotary piling procedure was adopted in the execution of these piles.

• The depth of pile thus executed was 10.50 m with respect to the typical profile.

• The piling work completed and the site was handed over for superstructure construction.

PILLING BORING MACHINE:•The excavation was to be made to a depth of roughly 2.50 m for accommodating the thick pile caps connecting 4 to 10 piles in a group.

•Many piles did not record concrete even after 2.50 m excavation.

Cont…Gantry GirderGantry girders are laterally unsupported beams to carry heavy loads from place to place at the construction sites, mostly these are of steel material.

• We need to set up gantry girder along with the crane system; so, how to design and what are the aspects of design procedures, those things we will discuss.

• The rails on either side of the bridge rest on crane gantry girders. The gantry girders are the girders which support the loads transmitted through the travelling (moving) wheels of the cranes as shown in figure below.

• Here the difference you will get is that - one is the due to moving load; because of moving load what will be the maximum bending movement and shear force of the, on the gantry girder for a particular position.

Cont…Power Shovel

Construction equipment & purpose to excavate the earth and load it into the trucks.Power shovel consists of mounting, cab, boom, dipper, dipper sticker & hoist line. It may operate on natural firm ground. The excavation of earth and loading is done with the help of dipper.

Other Equipments Bull Dozer Load Loader Clamshell TM(Transit Miller) Hoe Hopper Belt Conveyer

Batching PlantI also got an opportunity to visit Batching Plant and saw a sample concrete test done before major production.Batching plant consists of Silos (100 ton capacity) to hold cement and fly ash.Cement pump to pan mixer while sand and aggregate reaches pan mixer through a conveyer belt after being measured for quantity through a bucket system.

Cont…This mix is addedwith water &  admixture in the pan mixer and finally the mixing starts.The resultant designmix is released in the TM which is transferred to site for pouring through pumps, boom placeretc. Capacity of a TM is 6 cu m and RMC should be poured within 2 hrs of production.

Cont…Hopper is used in the BP to convey aggregate of 10mm & 20mm.PAN Mixer is used to mixed the concrete minimum at 30 second in the BP. Temperature required for concrete in BP is 30 degree(+-3). Pile Foundation : Required 40m depth in the river and 25-30m depth in normal place(depends upon strength of the soil).

Quality ControlQuality is the key component which propels performance and defines leadership traits. At L&Tconstruction, quality standards have been internalized and documented in quality assurance manuals.L&T construction recognizes the crucial significance of the human element in insuring quality.Structured training programme ensures that every L&T employee is conscious of his/her role andresponsibility in extending L&T construction’s tradition of leadership through quality.

Cont…Responsibilities of official at Site:-Handle Staff for inspection and tests of materials and workmanship.Correspondence with client through reports and resolve complaints. In charge of Non-conforming product, preventive and corrective actions to be taken and risk register to be maintained.Train employees, sub-contractors, supervisors and workmen for quality control and marking is done after training to see if they are suitable to maintain quality of work.

Cont…Maintain paper work like: Monthly quality report, Work completion report, Cost of poor quality etc.Handle and inspect materials in store. Give product quality rating.Maintain availability of latest drawings and also ensure that only latest drawings are being used at site for construction purpose. Report top management for coordinated project management. Control and check the monitoring & measuring equipment.Handle the quality of purchased items.

Cont…One of the biggest responsibilities is to conduct various tests. Some of them observed by me duringtraining were:Compression Cube Test: To check achieved strength of concrete in 7 & 28 days. Cube tests for M25 and M50 concrete were observed.Concrete Slump Cone Test: To check workability of concrete mix. Ideal slump should be 125 mm & Variation of 25 mm on both sides is permitted. Test On Cement:

Consistency Initial & Final Setting Time

Cont…Aggregate Impact ValueAggregate Crushing ValueGradation Of AggregateSilt Content Test Cube Testing:

For 70.6mm Size Cube For 100mm Size CubeFor 150mm Size Cube

ConclusionsIt was a wonderful learning experience at L&T Constructions Barapullah Over Hanging Bridge project for 30 days in Sarai Kale Khan. I gained a lot of insight regarding almost every aspect of site. I was given exposure in almost all the departments at the site. The friendly welcome from all the employees is appreciating, sharing their experience and giving their peace of wisdom which they have gained in long journey of work. I am very much thankful for the wonderful accommodation facility from L&T. I hope this experience will surely help me in my future and also in shaping my career.

Cont…After the training we came to the following conclusions:Summer training gives opportunity to differentiate between theoretical and practical aspects.Understood the importance of coordination between planning, execution, safety, store keeping, mechanical, electrical departments. Learnt how to get work executed by the coordination of different peoples on site. Learned many new things by visiting the sites and by the experience of the staff of L&T.

References:-L&T Staff.Lab Testing Handbook. IS: 456-2000 CODE for Concrete Design.

Thanking YouA wonderful and appreciative Presentation was given by a

great guy’s called

“Mr. Naveen Kumar”