BEST METHOD FOR HIGH RISE CONSTRUCTION - GPS? ZENITH/VERTICAL OPTICAL PLUMMET? RESECTION

Greetings from Malta.

Malta

To those out there who had an experience of high rise construction, i would like to share some of your advice for the young generations. 

 

I am a qualified 28 year old land surveyor working with a construction company in Malta.

I will be involved for construction of a high rise construction project and it will consist of 4 towers of different floor levels. The height tower is 21 floors from the road. You need to keep into consideration that the facade will be constructed with glass material thus the accuracy should be within its tolerance when setting out the edge of concrete slab and also the lift should be kept vertically straight against deflection. As you can see from the development model, the construction is straight forward.

This is the first experience that I am going to get involved on such a big project and thus I need some professional advises to make a proper decision.

 

 

Attached are some pictures of the project for a better idea and also the location of the site from google map. You can type on google maps/search: Mriehel Gasan and you will find the exact site location.

 

 

I am not sure which method I am going to use for this project. After an intensive research I have not yet made my mind up for the best land surveying practices method for a high rise building do carry out the setting out of points and transfer the datum levels on each floor in terms of accuracy and precision and time efficiency. 

 

  • Using Zenith Laser Optical Plummet as per below instruments? Using this zenith optical plummet means that we must leave a vertical hole on each slab from the very bottom basement levels till the complete of construction. Am I correct?

 

  • GNSS method would be better, easy, more accurate and faster? I thought to use GS16 as a rover while I can connect with free of charge base reference station from Government Mapping Department. It is free because it was funded by the EU so it is public. Do you think this system will achieve its accuracy standard? I guess using an RTK system mounting the rover on the total station (smart total station) since setting out of hundreds of points with total station is faster (since laser helps a lot to guide the laborer to put nails). I saw a lot of surveyors in Dubai using GNSS system for high rise construction. What do you suggest?

Since there will be 1 crew (1 land surveyor which is me and 1 assistant/laborer) assigned on this project, do you think that using GPS is faster? Or still believe with the optical plummet? I have the feeling that the process of using the software spider or any other kings of software's is a long process because every time I do the setup and after starting the antenna to receive the signals, then I have to go all the way down the stairs to my mobile office do run the software, then back again near the gps/smart total station to commence the setting out. Am I right?

 

The purpose of the spider software is to adjust the control points to use the post processing method? I thought maybe I could use the RTK system.

 

 

 

  • The other method is resection. Let’s say I get a permission from the owners to install some ten 360 prisms on the building roofs so that I can use resection method. With total station I can setup and observe 4 stations which is orientation with resection by installing several 360 prisms on the top of the building when the construction reach its certain height levels but I am not sure the it will achieve its top accuracy with resection despite these prisms will be located away from the site about 300 meters or more. My question is about the accuracy and efficiency because I think for these 10 stations, somehow I need to carry out a traverse observations to adjust these stations.

 

 

  • Or maybe other method that I missed or product that I might not be aware yet?

 

I am really looking forward to hear from you guys. Thanks for your time and interest.  

This Content Originally Published by a land surveyor to Land Surveyors United Network

Views: 426

See Your Saved Posts Timeline

Download Survey Documents-Members Only
Was this resource helpful? Show your appreciation with a comment below. 

Donations are how we exist and grow for the surveying community worldwide.

☇ Reply to this

Replies to This Discussion

High rise surveying is over my head. Lol sorry

ok thanks. Thanks for your time. 

All depends on the control you have to come from. Stay away from resection. Do not use GPS. Pick a control line and stick with that one control line...if you can't set up rectangular control lines for each of the buildings. Use a total station and only use that one. Make sure it's calibrated both horizontally and vertically. Make sure you know if the compensators are on or off. Get a 90 degree eyepiece if you are plumming the steel.

ok. Thanks for your suggestions

RTK GPS is not accurate enough.

Vertical laser is not accurate enough also. There are special optical plummets (zenith/nadir) used in mines, but if you have not used those method before it will be better to choose the total station.

Use a very accurate (1", 2" or at least 3" but not worse), calibrated total station as ROB ROSA mentioned before.

Resection is not the most accurate solution, but better than the RTK.

If you can use more than 2 points for resection, it may accurate enough, if your control network is very precise, but don't forget, as the building grows higher, it will be difficult to measure 2-3-4 points for resection, and if you can see 2-3-4, they will be nearly the same direction (worse geometry), except on the corners.

360° prism are not as accurate as the single prism or the reflect foils, so I recommend you to use normal prisms.

Setup your instrument on the ground level and establish some control points on each floor. It would be better if your points are located far from each other, adjacent side of the building (at least two, but more is better). Then you can use your control points as station points, and for backsight as well. You must check your network on each floor using backsight points on the same floor and on the ground level as well.

That's a really interesting article on the Leica control wall, Billy. Thank you... Every day a school day!

useful post. thanks.

Thanks for sharing. Really helpful 

Thank you , Christian

Thank you Paul for the shout back,always good to here.

Billy

hi

as stated Rtk is not really a good tool to control the high rise buildings.

try to use min 3 plumbing points ( slab opening) & plumb them up to your active slab using laser plummet or with total station .

u have to coordinate with your structural engineer to finalize the location of your plumbing points.

once the points location are defined make sure all the points are best fit to each other as well as, with the primary control points.

u could spread out your primary control points around your plot limits to keep a cross check each time u set up your instrument. try to setup wall mounted prisms in surrounding building at maximum height for better view and availability.

resection is always much more accurate and convenient than keeping a base line or sticking with back sight method.

dont forget to check the inner constraint of the plumbing points each time u shift them up the next floor.

best of luck 

Sarfraz

RSS

Where Thousands of Professional Land Surveyors, Students of Surveying and Educators are United through Collaborative Knowledge and Purpose.

Tools,Apps and Quick Guides

Dedicated to the Memory of Skip Farrow (1953-2015)

+ Surveyor Sharer

Drag Button to bookmark bar and view submitted links here.Will soon be moved to a directory

AFGHANISTAN SURVEYORS ALBANIA SURVEYORS ALGERIA SURVEYORS AMERICAN SAMOA SURVEYORS ANDORRA SURVEYORS
ANGOLA SURVEYORS ANGUILLA SURVEYORS ANTIGUA & BARBUDA SURVEYORS ARGENTINA SURVEYORS ARMENIA SURVEYORS
ARUBA SURVEYORS AUSTRALIA SURVEYORS AUSTRIA SURVEYORS AZERBAIJAN SURVEYORS BAHAMAS SURVEYORS
BAHRAIN SURVEYORS BANGLADESH SURVEYORS BARBADOS SURVEYORS BELARUS SURVEYORS BELGIUM SURVEYORS
BELIZE SURVEYORS BENIN SURVEYORS BERMUDA SURVEYORS BHUTAN SURVEYORS BOLIVIA SURVEYORS
BOSNIA & HERZEGOWINA SURVEYORS BOTSWANA SURVEYORS BRAZIL SURVEYORS BRITISH INDIAN OCEAN TERRITORY SURVEYORS
BRUNEI DARUSSALAM SURVEYORS BULGARIA SURVEYORS BURKINA FASO SURVEYORS BURUNDI SURVEYORS CAMBODIA SURVEYORS
CAMEROON SURVEYORS CANADA SURVEYORS CAPE VERDE SURVEYORS CAYMAN ISLANDS SURVEYORS CENTRAL AFRICAN REPUBLIC SURVEYORS
CHAD SURVEYORS CHILE SURVEYORS CHINA SURVEYORS COLOMBIA SURVEYORS COMOROS SURVEYORS
CONGO SURVEYORS DEMOCRATIC REPUBLIC OF THE CONGO SURVEYORS COOK ISLANDS SURVEYORS COSTA RICA SURVEYORS COTE D'IVOIRE SURVEYORS
CROATIA SURVEYORS CUBA SURVEYORS CURACAO SURVEYORS CYPRUS SURVEYORS CZECH REPUBLIC SURVEYORS
DENMARK SURVEYORS DJIBOUTI SURVEYORS DOMINICA SURVEYORS DOMINICAN REPUBLIC SURVEYORS ECUADOR SURVEYORS
EGYPT SURVEYORS EL SALVADOR SURVEYORS EQUATORIAL GUINEA SURVEYORS ERITREA SURVEYORS ESTONIA SURVEYORS
ETHIOPIA SURVEYORS EUROPEAN UNION SURVEYORS FAROE ISLANDS SURVEYORS FIJI SURVEYORS FINLAND SURVEYORS
FRANCE SURVEYORS FRENCH GUIANA SURVEYORS FRENCH POLYNESIA SURVEYORS GABON SURVEYORS GAMBIA SURVEYORS
GEORGIA SURVEYORS GERMANY SURVEYORS GHANA SURVEYORS GIBRALTAR SURVEYORS GREECE SURVEYORS
GREENLAND SURVEYORS GRENADA SURVEYORS GUADELOUPE SURVEYORS GUAM SURVEYORS GUATEMALA SURVEYORS
GUERNSEY SURVEYORS GUINEA SURVEYORS GUINEA-BISSAU SURVEYORS GUYANA SURVEYORS HAITI SURVEYORS
HOLY SEE SURVEYORS HONDURAS SURVEYORS HONG KONG SURVEYORS HUNGARY SURVEYORS ICELAND SURVEYORS
INDIA SURVEYORS INDONESIA SURVEYORS IRAN SURVEYORS IRAQ SURVEYORS IRELAND SURVEYORS
ISLE OF MAN SURVEYORS ISRAEL SURVEYORS ITALY SURVEYORS JAMAICA SURVEYORS JAPAN SURVEYORS
JERSEY SURVEYORS JORDAN SURVEYORS KAZAKHSTAN SURVEYORS KENYA SURVEYORS KIRIBATI SURVEYORS
KOREA SURVEYORS KOREA REPUBLIC OF SURVEYORS KUWAIT SURVEYORS KYRGYZSTAN SURVEYORS LAO PEOPLE'S DEMOCRATIC REPUBLIC SURVEYORS
LATVIA SURVEYORS LEBANON SURVEYORS LESOTHO SURVEYORS LIBERIA SURVEYORS LIBYAN ARAB JAMAHIRIYA SURVEYORS
LIECHTENSTEIN SURVEYORS LITHUANIA SURVEYORS LUXEMBOURG SURVEYORS MACAU SURVEYORS MACEDONIA SURVEYORS
MADAGASCAR SURVEYORS MALAWI SURVEYORS MALAYSIA SURVEYORS MALDIVES SURVEYORS MALI SURVEYORS
MALTA SURVEYORS MARSHALL ISLANDS SURVEYORS MARTINIQUE SURVEYORS MAURITANIA SURVEYORS MAURITIUS SURVEYORS
MAYOTTE SURVEYORS MEXICO SURVEYORS MICRONESIA SURVEYORS MOLDOVA SURVEYORS MONACO SURVEYORS
MONGOLIA SURVEYORS MONTENEGRO SURVEYORS MONTSERRAT SURVEYORS MOROCCO SURVEYORS MOZAMBIQUE SURVEYORS
MYANMAR SURVEYORS NAMIBIA SURVEYORS NAURU SURVEYORS NEPAL SURVEYORS NETHERLANDS SURVEYORS
NEW CALEDONIA SURVEYORS NEW ZEALAND SURVEYORS NICARAGUA SURVEYORS NIGER SURVEYORS NIGERIA SURVEYORS
NIUE SURVEYORS NON-SPEC ASIA PAS LOCATION SURVEYORS NORFOLK ISLAND SURVEYORS NORTHERN MARIANA ISLANDS SURVEYORS NORWAY SURVEYORS
OMAN SURVEYORS PAKISTAN SURVEYORS PALAU SURVEYORS PALESTINIAN TERRITORY OCCUPIED SURVEYORS PANAMA SURVEYORS
PAPUA NEW GUINEA SURVEYORS PARAGUAY SURVEYORS PERU SURVEYORS PHILIPPINES SURVEYORS POLAND SURVEYORS
PORTUGAL SURVEYORS PUERTO RICO SURVEYORS QATAR SURVEYORS RESERVED SURVEYORS REUNION SURVEYORS
ROMANIA SURVEYORS RUSSIAN FEDERATION SURVEYORS RWANDA SURVEYORS SAINT KITTS & NEVIS SURVEYORS SAINT LUCIA SURVEYORS
SAINT MARTIN SURVEYORS SAINT VINCENT & THE GRENADINES SURVEYORS SAMOA SURVEYORS SAN MARINO SURVEYORS SAO TOME & PRINCIPE SURVEYORS
SAUDI ARABIA SURVEYORS SENEGAL SURVEYORS SERBIA SURVEYORS SEYCHELLES SURVEYORS SIERRA LEONE SURVEYORS
SINGAPORE SURVEYORS SINT MAARTEN SURVEYORS SLOVAKIA (SLOVAK REPUBLIC) SURVEYORS SLOVENIA SURVEYORS SOLOMON ISLANDS SURVEYORS
SOMALIA SURVEYORS SOUTH AFRICA SURVEYORS SOUTH SUDAN SURVEYORS SPAIN SURVEYORS SRI LANKA SURVEYORS
ST. PIERRE AND MIQUELON SURVEYORS SUDAN SURVEYORS SURINAME SURVEYORS SWAZILAND SURVEYORS SWEDEN SURVEYORS
SWITZERLAND SURVEYORS SYRIAN ARAB REPUBLIC SURVEYORS TAIWAN; REPUBLIC OF CHINA (ROC) SURVEYORS TAJIKISTAN SURVEYORS TANZANIA UNITED REPUBLIC OF SURVEYORS
THAILAND SURVEYORS TIMOR-LESTE SURVEYORS TOGO SURVEYORS TOKELAU SURVEYORS TONGA SURVEYORS
TRINIDAD AND TOBAGO SURVEYORS TUNISIA SURVEYORS TURKEY SURVEYORS TURKMENISTAN SURVEYORS TURKS AND CAICOS ISLANDS SURVEYORS
TUVALU SURVEYORS UGANDA SURVEYORS UKRAINE SURVEYORS UNITED ARAB EMIRATES SURVEYORS UNITED KINGDOM SURVEYORS
UNITED STATES SURVEYORS URUGUAY SURVEYORS UZBEKISTAN SURVEYORS VANUATU SURVEYORS VENEZUELA SURVEYORS
VIET NAM SURVEYORS VIRGIN ISLANDS (BRITISH) SURVEYORS VIRGIN ISLANDS (U.S.) SURVEYORS WALLIS AND FUTUNA ISLANDS SURVEYORS YEMEN SURVEYORS
ZAMBIA SURVEYORS ZIMBABWE SURVEYORS SURVEYORS

Location Based Surveying Practices

Land Surveyors United is the world's FIRST Global Social Network for geospatial professionals. We have dedicated, geolocated support groups for practically every country, continent and state on earth, for you to utilize for building your personal network. We are all essentially concerned with the same issues, no matter where we are located on earth. However, surveying practices and methods vary depending on the geographic location where we work. If you have noticed similarities and differences between the conditions, laws and practices between two or more areas of the world,discuss it in this forum. Build your reputation online by posting relevant discussions in your local group below.

Join and Introduce Yourself in Your Local Geosocial Forum:

Alabama Alaska Arizona Arkansas California
Colorado Connecticut Delaware Florida Georgia
Hawaii Idaho Illinois Indiana Iowa
Kansas Kentucky Louisiana Maine Maryland
Massachusetts Michigan Minnesota Mississippi Missouri
Montana Nebraska Nevada New Hampshire New Jersey
New Mexico New York North Carolina North Dakota Ohio
Oklahoma Oregon Pennsylvania Rhode Island South Carolina
South Dakota Tennessee Texas Utah Vermont
Virginia Washington West Virginia Wisconsin Wyoming

Not based in the US? Here are other groups for surveyors around the world to join and contribute knowledge and experiences as a land surveyor:

Africa Asia Australia Europe Russia Canada
Antarctica S.America N. America India Malaysia Caribbean

And more... Find your group forum based on location.

Choose Your Equipment Group Here

Handheld US Social Support for Land SurveyorsNIKON Social Support for Land SurveyorsTrimble Social Support for Land SurveyorsTopcon Social Support for Land SurveyorsSokkia Social Support for Land SurveyorsAshtech Social Support for Land SurveyorsNAVCOM Social Support for Land SurveyorsMagellan Social Support for Land SurveyorsLeica Social Support for Land SurveyorsAltus Positioning Social Support for Land SurveyorsMicroSurvey Social Support for Land SurveyorsJuniper Systems Social Support for Land SurveyorsTraverse PC Social Support for Land SurveyorsCarlson Software Social Support for Land Surveyors

what where  
job title, keywords or company
city, state or zip jobs by job search

PLEASE DONATE TODAY. Your generosity preserves surveying and mapping knowledge for future generations. Thank you.

Survey Equipment Troubles?

Geo Visitors Map

Choose Your Group Here

Surveying Equipment Support for Leica, Carlson, Sokkia, Trimble, Topcon, Altus, Nikon equipment


Surveyor Birthdays

Surveyor Birthdays Today

© 2017   © Created by Land Surveyors United   Powered by

Badges  |  Contact LSU  |  Privacy Policy  |  Terms of Service

Live Support