Laser Screed Technology

.

BIRLA VISHVAKARMA

MAHAVIDHYALAYA

Prepared By:

HARDIK B LOKHANDWALAENROLLMENT NO: 13CM119

FIRST SEMESTER

Guide By:

PROF. JAYESHKUMAR R. PITRODAASSISTANT PROFESSOR & RESEARCH SCHOLAR

CIVIL ENGINEERING DEPARTMENTB.V.M ENGINEERING COLLEGE

V.V.NAGAR

M.E. [ CONSTRUCTION ENGINEERING & MANAGEMENT ]

CONSTRUCTION TECHNIQUES (711402)

GUJARAT TECHNOLOGICAL

UNIVERSITY

• Introduction Of Laser Screed Technology

• How this technology works? • Types of Laser Screed

products • Difference between Manual

screeding and Laser screeding

• Case Study• The benefits of Laser Screed• Limitations of Laser Screed• Acknowledgment• References

Contents

Laser Screed Technology

Screed is a flat board, or a aluminium tool, used to smooth concrete after it has been placed on a surface. Also used to assist in levelling the application of plaster.

Introduction

The introduction of the Laser Screed machine coincided(happen simultaneously) with increased demands for flatter and more level industrial/warehouse floors. Laser screed technology produces slab-on-grade concrete floors that are flatter and stronger than any comparative floors produced by using conventional methods. They establish grade by laser, utilizing a 3D profiler system, disperse concrete by auger, and then vibrate and consolidate the concrete. 

Laser Screeds are setting new standards for concrete floors. In addition to being laser, this technology is precise and mechanically powerful, they are fast. It can accurately screed 240 square feet of concrete in just 60 seconds. That means more floor is placed daily and production schedules are satisfied or actually shortened.

How this technology works?

The laser screed machine has four wheel drive, four wheel steer and is operated by one person seated at a point of maximum visibility. It utilizes a 360° rotating platform with a telescopic boom.  The end of the boom is a screed head that is a plough and auger that cuts the concrete to level and a vibrating beam to compact the material.  

The screed head boasts a laser-guided, automatic control system.  This system allows the machine to accurately place and finish concrete to the exact level and finish specified.  There are 2 receivers on the screed head, that receive signals from the static laser transmitter which provides a constant reference to the datum level.  This transmitted signal functions to automatically adjust the hydraulic cylinders that guide the screed head.

At the commencement of a pour, the wet material is poured onto the slab area from the supplier’s delivery truck.  Once material placement has begun the laser screed is mobilized into position.  At his point the telescopic boom extends over the concrete, manoeuvring the head to the start position.  As the boom retracts(pull towards center) it compacts and levels the material, producing a flawlessly flat slab.  This process allows for consistent material delivery, across a vast surface area, in a minimal time frame.

How it works.mp4

Working Of Laser Screeding

Laser screed machine workings.mp4

Somero Enterprises,Inc

The Somero Laser Screed® concrete screeding machine was developed in the mid 1980s based on patented technology to provide a highly accurate, mechanical method of screeding concrete for slab-on-grade floors.

Somero successfully launched different types of Laser Screed products whcich are enlisted below. S-15m LASER SCREED

S-840 LASER SCREED concrete leveling equipment

SXP®-D LASER SCREED concrete leveling equipment

Mini Screed

Mini Screed C

3-D Profiler System

CopperHead

PowerRake

HoseHog

STS-132 Topping Spreader

Specifications

The S-15m Laser Screed ® concrete levelling machine screeds

15m2 (160 sf) per pass with a 6m (20') telescopic boom reaching out over the concrete. 

Quick and easy setup

Screed up to 460 m²/hour

One person operation. It does the work of 5 men compared to conventionalcrews.

Improved floor levelness.

Automatic soft landing,column block protection,self-levelling heads, augerand vibrator on/off.

On board display screen.

Specifications

S-840 Laser Screed has 6’ or 8’ head option to increase productivity.

Increases Laser Screed utilization.

Screeds up to 5000 square feet/hour

Offset auger head design allows for a one man operation.

New control system allows faster elevation.

Proportional valving.

Live calibration

Specifications

Full-time electrical system diagnostics - alerts the operator instantly should an electrical fault occur within wires, switches, etc., and suggests a fault location.

Full-time hydraulic system diagnostics -provides hydraulic system information to the operator

Full-time engineperformancediagnostics

Auto stabilizers 

Operator-adjustable 

Specifications

Laser-controlled accuracy.

Screeds to higher tolerance than conventional methods.

Works well with various slump and mix designs.

Better concrete consolidation than hand-held vibratory screeds.

Lightweight and easy manoeuvrability.

Easy set-up, breakdown and transportseasily in the backof a pickup truck.

Single and dual slope capabilities.

Saves time and money.

Specifications

The CopperHead XD uses Somero's patented laser leveling technology to cut the concrete to a finished grade, screed it flat, and vibrate it smooth in one pass.

It will work faster because the CopperHead XD sets grade automatically, allowing the operatorto move quickly and efficiently through the work area.

The CopperHead XD'scompact and lightweight design insures ease of operation.

The hydraulic drive motorskeep the XD pulling low slumpconcrete and riding smoothly over chaired rebar and other obstacles.

Specifications

PowerRake 3 has optional auger screed head which gives even more versatility on the jobsite. 

One man screeding operation

Reduction in manpowerwhen screeding concreteto finish grade.

Better accuracy andconsolidation than traditional methods.

Ability to handle low slump concrete consistently.

Extremely maneuverable.

Productivity - 3,000 sq. ft. and above.

Specifications

The HoseHog is a unique combination of advanced technology and old fashion horsepower that removes the back-breaking and extremely labour-intensive task of dragging concrete hose either on elevated deck or slab on grade.

increase productivity 20-30%.

Labor Savings

Reduce Job-Site Injuries

Specifications

This completely redesigned Topping Spreader allows you to accurately and efficiently spread dry shake toppings on concrete floors and slabs. 

The new STS-132 gives thefreedom to pour any width,shape or size, cutting loose from the limitations of conventional spreaders.

The high level ofmaneuverability allows to doeasily work closely around columns and other obstructions. 

Save time and labor

new electronic joystick controls,automatic feed system, computer adjustable parameters, and increased capacity.

Difference between Manual screeding and Laser screeding

Manual Screeding/Rodding

Lots of forward bending causes awkward torso posture 79% of the

time

Holding the “rod” (2” x 4” board) requires

a pinch grip with extreme wrist flexion.

Repetitive hand/arm activity

High hand forces are required to pull the “rod” to smooth the

concrete.

Relatively slower than Laser screed machine

CopperHead Laser Screed

The design allows for an upright posture 95% of the time

Pinch grips and wrist flexion are eliminated.

Hand arm repetition is reduced

Very low push/pull force required

much faster than manual rodding with better quality screed.

Case study

A report was presented by GLENN A. SHEPHARD on “LASER TECHNOLOGIES APPLICATION TO CONSTRUCTION” to the Graduate Committee of the Department Civil Engineering in Partial Fulfillment of the Requirements for the Degree of Master of Civil Engineering, University of Florida ,Summer 1999.

In this case study ,the application of Laser screed technology was described briefly and its comparison to hand screeding was also notified in report given by GLENN A. SHEPHARD

Research includes Figures 1 and 2 illustrate floor flatness (FF) measured in inches over the plane surface in yards. While the floor profile deviations of 1/2-inch over 10 yards for a hand screed floor appear to be insignificant.

Figure 1. Hand Screed Floor Profile - deviation in inchesover plane measurement in yards. (Laser Screed Ltd., 1999)

Figure 2. Laser Screed Floor Profile - deviation in inchesover plane measurement in yards. (Laser Screed Ltd., 1999)

The benefits of Laser Screed Technology

Faster placement - Laser Screed machines can accurately level 240 square feet of concrete in less than one minute.  It easily moves around obstacles on the jobsite and eliminates most framework, meaning more floor or paving is placed daily and production schedules are satisfied or actually shortened.  Fast-track  production, high quality, and cost effectiveness are all direct benefits of utilizing Laser Screed.

Flatter floors – we can achieve laser-precise flatness and levelness every time.  Floors are routinely flatter, stronger, and more level than floors produced with any other conventional method.

Fewer workers – The Laser Screed equipments does the tough, strenuous (effortful) work, so we simply get more work done with less manual effort, allowing to make larger daily placements with fewer workers.

To be continued …..

Produces floors  of  unequalled flatness & levelness

Reduces  labour costs due to faster placing times and reduced form  work

Increases productivity & efficiency

Assures greater accuracy through Laser Technology

Easily places 3”-4” slump concrete, larger aggregate mixes, and fibrous concrete

Concrete is levelled and compacted in one operation,

producing  high strength, dense, durable floors

Improves floor quality & increases profits

Limitations of Laser Screed Technology

The most significant limitation to using the laser screed is that it is only practical for larger jobs ( more than 50,000 ft²)

Other limitations are primarily related to the laser sreed’s size and weigh. A fairly large door is needed, and light reinforcement will not carry up to the machine’s weight.

References

Ravindra K Dhir, Peter C. Hewlett “Concrete in the Service of Mankind: Radical concrete technology, Volume 4” k,E & FN SPON Publication.

GLENN A. SHEPHARD, 'LASER TECHNOLOGIES APPLICATION TO CONSTRUCTION'A Report Presented to the Graduate Committee of the Department Civil Engineering in Partial Fulfillment of the Requirements for the Degree of Master of Civil Engineering, University of Florida ,Summer 1999

www.amanabuildings.com/resources/laser-screed

www.aquariustech.net/LaserScreed.html

www.cogriasia.com/laser-screed-floor-construction/Laser-screed-floors/

www.engineeringnews.co.za/article/laser-screed-equipment-range-achieves-flat-industrial-concrete-floors-2012-04-06

www.somero.com/product

en.wikipedia.org/wiki/Screed/

pmallam.dns-systems.net/ajclark/flooring.htm

techniconconstruction.com/services/1-column/

Acknowledgement

DR. F. S. Umrigar, Principal, B.V.M. Engineering college, Prof. J. J. Bhavsar, Associate Prof., PG co-ordinator, cvil engineering department, B.V.M. Engineering college Vallabh Vidhyanagar, Gujrat, India for their motivation and infrastructural support to carry out the research work.

Prof. Jayeshkuar R. Pitroda assitant prof. And research scholar civil engineering department, B.V.M. Engineering college Vallabh Vidhyanagar.

Thank

yo

u