LASER SCANNING TECHNOLOGY IN CIVIL ENGINEERING CONSTRUCTION PROJECTS

Presented BySURYA C.D

ME Construction Management

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CONTENTS Objectives 3

Scope 4

What is Laser Scanning ? 5

Why is Laser Scanning ? 10

Major applications in Civil Engineering 11

Case Study 19

Disadvantages 24

Conclusion 25

References 262Date:30/1/2011

SLIDE NUMBER

OBJECTIVES

To reveal the applications of Laser Scanning Technology in Civil

Engineering construction Projects

To reveal the benefits of using Laser Scanning technology in

construction field

To show the simple working of Laser Scanner.

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SCOPE

Used mainly for 3D modeling, dam monitoring etc.

Used in construction manufacturing plants, airports ,hospitals bridges etc.

Increases speed and accuracy of plans, elevations, profiles, and volume and area calculations.

Valuable tool for reduction of construction costs

Ensure fast & accurate data whenever required.

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What is Laser Scanner ?

LASER SCANNER

Laser Unit

Rotating Unit

Control And

Recording Unit

Ranging Unit

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Detailed 3D positioning of a structure can be made.

Provide full FOV (Full field of view)

Advanced timing technology

Accurate enough up to 2 mm resolution

Long range up to about 300 m with good reflective surfaces.

Cannot be easily set up over a known point (heavy)

 

Characteristics

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Scanner Specifications

Speed-5000 points per second

360 degree field of view

Weighs-13 Kg to 15 Kg

340mm deep & 270 mm wide

Requires electric power to operate.

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Basic Concept

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Fig 1.1: 3d laser scanner

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Why Laser scanning ?

Higher project costs Missed schedulesOperations & maintenance inefficiencies

and problemsSafety problems

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Applications

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3D modeling

• Data Acquisition

• Data processing

• Modeling

Steps Involved:-

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STEP 1: Target the structure

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Fig. 3.1 Targeting bridge

STEP 2 : Point Clouding

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Fig.3.2 Point clouding

STEP 3 : Modeling / Meshing

1501/05/2023 Fig. 3.3 Mesh model

LST for Railway And track Survey

The Scanner is mounted on a rail vehicle

The Operator moves this vehicle over the rail

Clearance analysis

• Vegetation ,signal signs, tunnels

Profile of alignment of rails is recorded.

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Fig.4.1 Scanner installed in rail vehicle

Capturing the obstacles near by track

Maintenance of track is carried out

Ballast monitoring using mobile 3D laser scanner

Under normal conditions, the 3D mobile laser scanner map features such as signs, lights etc.

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Fig. 4.2.

Fig.4.3.

LST for Dam Monitoring

Monitoring –evaluating the structural safety of dams

Surface displacements are important quantities to be determined

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Case study

Alto ceira is dam situated in portugal

Crack surveying and mapping -- major problems of dam

Cracks wider than 2 or 3mm are to be surveyed.

The main challenge in dam monitoring – resolution of images rather than metric quality

3 stations have been set up for the scanner

Perspective view of the dam is obtained

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Processing and modeling is done by meshing

Orto images were created

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Vectorization using CAD software

Association of CAD and DBMS

Accurate model of dam with cracks is obtained and can be then analyzed

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Other applications

Deformation monitoring

Distance measurement

Determine building maintenance requirements

Helps in determination of earthwork quantities

Used to measure bridge camber

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When scanning outside, vegetation such as trees pose a major obstacle

Power stability is an issue for continuous usage.

Weather must be considered for outside scan.

Major Disadvantages

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Conclusion

Possibilities of laser scanning in civil engineering is limitless

Reliable technology

Gives high fidelity data

Enable Precise and accurate 3D model of any structure

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References

[1] Jocea Andreea Florinas,”3D spatial data acquisition and modeling of Anghel saligney monument using terrestrial laser scanning” Vol 2(15),2012,pp.2-5

[2] A Bernini’s, “Terrestrial laser scanning-civil engineering applications” Vol XXXVIII, Part 5,2010

[3] Pedro Arias and Higino Gonzalez, “Novel method to determine laser scanner accuracy for applications in civil engineering “Vol XLII,No. 1,2012

[4] Arias, J Armesto, M solla “ Terrestrial laser scanning and non parametric methods in masonry arches inspection” Vol XXXVIII,2010

[5] WIKIPEDIA,http//www.wikipedia.com//

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Thank you

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