Featured Tender: Supply and Delivery of New 4×4 SUV Vehicle and Trade – in an Old Vehicle

Supply and Delivery of New 4×4 SUV Vehicle and Trade – in an Old Vehicle

vertical mixers

Contract Number:

MTU31/2017/18 – Mtubatuba Municipality

Description:

Supply and Delivery of New 4×4 SUV Vehicle and Trade – in an Old Vehicle. Bidders are hereby invited from registered motor vehicle dealers for the supply and delivery of a new vehicle and trade in of old vehicle.

Category Industries
Fleet Management & Transportation Institutional
Region Site Inspection
KwaZulu-Natal 2018-06-05 11:00 AM
Closing Date Restrictions
12 June 2018 at 12:00 Prospective bidders must be registered on the National Treasury Centralised Database in order to be considered. All SCM returnable documents will listed in a tender document. Telegraphic, facsimile, or electronic bids will not be considered and late incomplete or unsigned bids will also not be considered It must be expressly understood that Municipality disclaims for the bidder to personalty ensure that the bid is placed in the tender box by the bidder’s own staff, or where appropriate, a courier appointed by the bidder. Bids will be evaluated and adjudicated in terms of Mtubatuba Municipality’s Supply Chain Management Policy and two stages will be implemented. First stage evaluation is functionality criteria and PPPFA which will be in the bid document and the second stage will be an 80/20 preferential point.

 

If you are a valued Tender subscriber, you can find more details about this Tender here
If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

 

About Antonette Claassens

I am a fanatical researcher who takes immense pride in the information I publish and those all-important finer details. When I'm not "researching up a storm", I love the ocean, fab music, and fine dining.

11 Largest Metro Systems In The World

posted in: Did You Know 9

11 Largest Metro Systems In The World

There are over 165 distinct systems that can be referred as metro system, subway systems or underground systems. Their size can be measured by a number of factors – number of users, total length of rails or number of stations. The below being some of the world’s largest metro systems:

1. New York City Subway, NYC, United States
• Total Stations: 472 stations – (424 if stations connected by transfers are counted as single stations) of stations.
• Total Length: The NYC subway has a total length of 373 km (232mi) – 4th in the world. Overall, the system contains 236 miles (380 km) of routes, translating into 665 miles (1,070 km) of revenue track; and a total of 850 miles (1,370 km) including non-revenue trackage.
• Interesting Facts: Opened in 1904, the New York City Subway is one of the world’s oldest (8th oldest to be exact), public transit systems, one of the world’s most used metro systems, and the metro system with the most stations.
• Users: 1.7 billion riders every year

 

2. Paris Métro, Paris, France
• Total Stations: 303 stations (62 of which have transfers between lines)
• Total Length: It’s 303 stations spread over 214 km (133 mi). The Métro has 214 kilometres (133 mi) of track and 303 stations, 62 connecting between lines, not including the RER network.
• Interesting Facts: The Paris Métro opened in 1900 making it the 5th oldest metro system in the world. The system expanded quickly until the First World War and the core was complete by the 1920s.
• Users: Over 1.5 billion riders every year

3. Madrid Metro, Madrid, Spain
• Total Stations: 300 stations
• Total Length: With almost the same number of stations as Paris and even a larger total length – 293 km (182 mi). But on top of that is another 386 kilometers of suburban rail services.
• Interesting Facts: The Madrid Metro was first opened in 1919. The Madrid Metro has 1,698 escalators, the most of any system in the world and has 522 elevators. The underground stations are so huge that they can hold public events, such as the three-day fitness festival in May 2011, which attracted 2,600 visitors. One station contains a 200-square-meter archaeological museum.
• Users: 500 million riders every year – least number of riders between all the metro systems listed

 

4. Seoul Subway, Seoul, South Korea
• Total Stations: 296 stations
• Total Length: It has total length of 327.0 km (203.2 mi)
• Interesting Facts: TheSeoul Subway opened much later than the previous systems – in 1974. Seoul’s metro system has TV’s, heated seats, cell phone service and are climate controlled. Its first metro line, Line 1, started construction in 1971 and opened in 1974, with through-operation to Korail suburban railways. Today, the network is one of the largest and most efficient urban railway systems in the world, with 331.5 km (206.0 mi) of track on lines 1–9 alone; wireless and internet service on all trains; and platform screen doors at the majority of stations. It also has real-time train information at every station.
• Users: Second largest number of riders of over 2.5 billion every year

 

5. London Underground (“The Tube”), London, England
• Total Stations: 270 stations
• Total Length: It is the third longest system with 400 km (250 mi).
• Interesting Facts: The famous London Tube first opened as an “underground railway” in 1863, but the first electric line opened in 1890 making it the world’s very first metro system. The Travelcard ticket was introduced in 1983 and Oyster, a contactless ticketing system, in 2003. Contactless card payments were introduced in 2014, the first public transport system in the world to do so. The system’s first tunnels were built just below the surface, using the cut-and-cover method; later, smaller, roughly circular tunnels which gave rise to its nickname, the Tube were dug through at a deeper level. Despite its name, only 45% of the system is actually underground in tunnels, with much of the network in the outer environs of London being on the surface.
• Users: More than 1.2 billion every year

6. Shanghai Metro, Shanghai, China
• Total Stations: 393 stations
• Total Length: 644 km (400 mi)
• Interesting Facts: Considering it only opened in 1993, with full-scale construction extending back to 1986 (Shanghai Metro). Shanghai Metro is also one of the busiest systems in the world. On 16 October 2013, with the extension of Line 11 into Kunshan in Jiangsu province, Shanghai Metro became the first rapid transit system in China to provide cross-provincial service and the second intercity metro after the Guangfo Metro. Further plans to connect the Shanghai Metro with the metro systems of Suzhou are under active review, with the first line connecting Shanghai Metro Line 11 and Suzhou Metro Line 3 projected to be completed in 2023. Ambitious expansion plans call for 25 lines with over 1,000 km of length by 2025. By then, every location in the central area of Shanghai will be within 600 meters of a subway station.
• Users: Over 3.53 billion every year

 

7. Beijing Subway, Beijing, China
• Total Stations: 370 stations
• Length: 608.2 km (377.9 mi) [If not counting Xijiao Line, 599.4 km (372.4 mi)] • Interesting Facts: The Beijing Subway opened in 1969 and is the oldest metro system in mainland China. Before the system underwent rapid expansion since 2002, it only consisted of only two lines. The existing network still cannot adequately meet the city’s mass transit needs. Beijing Subway’s extensive expansion plans call for 999 km (621 mi) of lines serving a projected 18.5 million trips every day by 2021. The most recent expansion, which included a one stop extension of Fangshan Line and the opening of Xijiao Line, S1 Line and Yanfang Line came into effect on December 30, 2017. There are currently over 300 km of subway under construction in Beijing, including six new fully automated lines totaling up to 300 km (190 mi) in length using domestically developed communications-based train control systems. This could potentially create the longest fully automated subway network in the world.
• Users: Beijing Subway is the busiest metro system in the world with over 3.2 billion users every year

8. Mexico City Metro, Mexico City, Mexico
• Total Stations: 195 stations
• Total Length: spread over 226.5 km (140.7mi)
• Interesting facts: The first stage of construction (1967–1972) comprised the construction and inauguration of lines 1, 2 and 3. Ten of the lines are rubber-tyred; instead of traditional steel wheels, they use pneumatic traction, which are quieter and cope better with Mexico City’s unstable soils. The system survived the 1985 Mexico City earthquake. Many stations are named for historical figures, places, or events in Mexican history. The Metro has figured in Mexico’s cultural history, as the inspiration for a musical composition for strings, “Metro Chabacano” and the 1982 Rodrigo “Rockdrigo” González’s 1982 song, “Metro Balderas.” It has also been a site for the 1990 Hollywood movie Total Recall. During the first stage of construction, workers uncovered two archaeological ruins, one Aztec idol, and the bones of a mammoth.
• Users: 1.6 billion riders every year.

 

9. Delhi Metro, Delhi, India

• Total Stations: 214 Stations (including 6 on Airport Express line and interchange stations).
• Total Length: 296.1 kilometres (184.0 mi)
• Interesting Facts: The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge. The Delhi Metro Rail Corporation was certified by the United Nations in 2011 as the first metro rail and rail-based system in the world to get “carbon credits for reducing greenhouse gas emissions” and helping in reducing pollution levels in the city.
• Users: 1.0 billion riders every year

 

10. Moscow Metro, Moscow, Russia
• Total Stations: 214 stations
• Total Length: 364.9 km (226.7 mi)
• Interesting Facts: The Moscow metro system opened in 1935 with one 11-kilometre (6.8 mi) line and 13 stations, it was the first underground railway system in the Soviet Union. As of 2018, the Moscow Metro excluding the Moscow Central Circle and Moscow Monorail has 214 stations and its route length is 364.9 km (226.7 mi), making it the sixth longest in the world. The Moscow metro is not just another metro system. The stations are known as “Underground palaces”. The beautiful underground structures are designed with care: with pictures on the walls, chandeliers hanging from the ceilings and more. The stations of the Moscow Metro are a major tourist attraction on their own. Some of the most beautiful stations are Komsomolskaya Metro Station, Kievskaya Metro Station, Prospekt Mira Metro Station, Park Pobedy Metro Station, Novoslobodskaya Metro Station, Mayakovskaya Metro station. The system is mostly underground, with the deepest section 84 metres (276 ft) underground at the Park Pobedy station, one of the world’s deepest.
• Users: Almost 2.5 billion people every year.

 

11. Tokyo Metro, Tokyo, Japan
• Total Stations: 179 stations
• Total Length: 195.1km (121.2mi) excluding the 8.3 km stretch between Wakoshi and Kotake-mukaihara shared with Yurakucho Line
• Interesting Facts: Tokyo Metro is operated by Tokyo Metro Co., Ltd., a private company jointly owned by the Japanese government and the Tokyo metropolitan government. The company replaced the Teito Rapid Transit Authority commonly known as Eidan or TRTA, on April 1, 2004. TRTA was administered by the Ministry of Land, Infrastructure and Transport, and jointly funded by the national and metropolitan governments. It was formed in 1941, although its oldest lines date back to 1927 with the opening of the Tokyo Underground Railway the same year. According to the company, an average of 6.33 million people used the company’s nine subway routes each day in 2009, making the company a profit of ¥63.5 billion for that year.
• Users: The Tokyo Metro is used by 14 billion people every year

 

Sources

https://en.wikipedia.org/wiki/New_York_City_Subway
https://en.wikipedia.org/wiki/Paris_Metro
https://en.wikipedia.org/wiki/Madrid_Metro
https://en.wikipedia.org/wiki/Seoul_Metropolitan_Subway
https://en.wikipedia.org/wiki/London_Underground
https://en.wikipedia.org/wiki/Shanghai_Metro
https://en.wikipedia.org/wiki/Beijing_Subway
https://en.wikipedia.org/wiki/Mexico_City_Metro
https://en.wikipedia.org/wiki/Moscow_Metro
https://en.wikipedia.org/wiki/Tokyo_Metro
https://en.wikipedia.org/wiki/Delhi_Metro

If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Liesel Du Preez

My journey with Leads 2 Business started in August 2005 in the Africa Tender Department, where I researched and uploaded Africa Tender Notifications. Once the Africa Tender Department had grown I was then promoted to Customer Relations in the IT Department in January of 2010, assisting subscribers and staff with any problems they may encounter or with any queries they may have.

Industry Events: JBCC Suite of Contracts and Key Principles of Tendering Workshop

Industry Events: JBCC Suite of Contracts and Key Principles of Tendering Workshop

Construction Events

Event:

JBCC Suite of Contracts

Date:

28 – 29 May 2018

Event location:

Melrose Place Guest Lodge, Johannesburg

Event Description:

JBCC Suite of Contracts – Edition 6.1 + 1 day JBCC Claims – Public and Onsite Training

Contact Details:

Tel: 0114477470
E-mail: faith@alusani.co.za

Event Details:

Website

 

 

Event:

Key Principles of Tendering Workshop

Date:

1 June 2018

Event location:

Umhlanga, Durban

Event Description:

South Africa’s premier masterclass on how to submit compliant and winning tenders. This workshop has now been presented to more than 2,000 delegates and with the on-going changes in the tendering legislation companies are advised to continue to align, not only their bids but also their sub-contracting processes with these regulations.

Contact Details:

Tel: +27 82 496 1657
E-mail: gerrit@taranisco.co.za

Event Details:

Website


If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Sasha Anderson

Millennial Mom + wife living the hash-tag life. Remember: If You Fail - Fail Forward

What they are, how do they work and what are they used for?

posted in: General 0

What they are, how do they work and what are they used for?

I am pretty sure most of us have driven past a construction site and wondered what the various machines are used for. Some are humongous!
Those are the ones that require those traffic-slowing “abnormal loads” that we pass now and then on the highway. I always look at the machines being transported, and try to imagine what they do.
To solve a bit of the mystery for some of us, I have gone on a research mission to determine the names and uses of five construction machines that I think could be of interest.

 

Articulated Haulers

This type of machine is also known as an articulated dump truck (ADT), and is capable of traversing tough terrain.
These dump trucks are used for the removal of earth or construction rubble, among other types of materials, and have also been effective for snow removal. In an extreme situation, Linco Construction in Texas used their articulated haulers to evacuate victims of a Hurricane

 

 

 

 

 

Dragline Excavators

Dragline excavators are often used in road and underwater excavation, and in surface mining.
The heavier types of dragline excavators usually have to be assembled on site. These machines use a bucket and rope system to gather materials and dump them.

 

 

 

 

 

 

Sheepsfoot Rollers

The purpose of a sheepsfoot roller, which is also known as a tamping roller or padfoot roller, is used for soil compaction.
A typical sheepsfoot roller is made up of a drum with stud-like protrusions covering the surface of the drum. These studs can be manufactured in different sizes, depending on the type of soil that is to be compacted.

 

 

 

 

 

 

Cold planers

Cold planers are used to remove the surface of paved areas – a process known as milling. These milling machines grind the surface of, for example, a road (asphalt), in order to lay new asphalt, or to smooth out the road surface.
Milling allows for the road surface to be recycled, making it a positive factor in ongoing efforts to curb negative impacts on the environment.
Cold planers use a milling drum to cut the paved surface. Tool holders, which are attached around the drum, hold cutting tools which cut the pavement.
The milled materials are held in the machine’s scrapper, and then transferred from the cold planer, using a conveyor belt, to another vehicle to be transported from the site.

 

 

 

 

 

Tower Cranes

 

Cranes are often the first construction machines that we see, even when the site is not in plain sight – see what I did there 😉 These are very tall machines, which are used to lift various types of materials, in order to place them where they are required.
A typical tower crane consists of a base, mast, slewing unit, machinery arm, counter weights and an operator’s cab. The base of the crane is secured to a concrete pad, which provides support. The tower section (or mast) gives the crane height, and is connected to the base. The slewing unit houses the motor which allows the crane to rotate, and also includes a working arm (longer horizontal section), machinery arm (shorter horizontal section) and counter weights. The crane operator manoeuvres the crane from the operator’s cab.

 

 

 

 

During my research into this topic, I have enjoyed learning more about some of the machines that I have seen, but knew nothing about.

I do hope that next time you pass a construction site, and you see some of the machines that I have mentioned, that you will have a better understanding of their purpose.

 

Sources:
Babcock
Google
Wikipedia
Engineering Intro

 

If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Bianca Warwick

I had the privilege of joining the Leads 2 Business content team in January 2012. I work in the exciting Projects department, following the progress of construction developments in KwaZulu-Natal and the Free State.

Featured Project: Infinite – Building

Infinite – Building
The Palms - Building

Description:

Construction of the new residential development known as Infinite located at the corner of Bradford and Nicol Road, Bedfordview, Gauteng. This is a brand new modern sectional title development which consists of 200 units done in 2 phases. This is a 10 storey development and includes basement parking, a communal swimming pool, 2 meeting rooms, a club house with a kitchen as well as a gym.

Status:

Underway

Category:

Building

Industry:

Residential

Sector:

Private

Region:

Gauteng

Value:

R 280 Million

Timing:

June 2017 to November 2018 (17 months)

Class

Invited / Negotiated

 

If you are a valued Projects subscriber, you can find more details about this Project here
If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Melanie Miles

One girl who would rather wear boots than high heels...

Featured Tender: Replacement of vertical mixers

Replacement of vertical mixers

vertical mixers

Contract Number:

ERW201708/TNDR-015 – Erwat

Description:

Bids/ proposals are invited for the Replacement of vertical mixers at various Erwat. WWCW: Manufacture, supply, deliver, install and commission.

Category Industry
Plant & Machinery Institutional, Water
Region Site Inspection
Gauteng 2018-06-05 11:00 AM
Closing Date Contract Period
22 June 2018 at 12:00 No Details

 

If you are a valued Tender subscriber, you can find more details about this Tender here
If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

 

The power of plant and equipment hire

posted in: Did You Know 0

The power of plant and equipment hire.

The power of plant and equipment hire

As the South African economy is seeing renewed energy in economic growth in 2018 while under new leadership, the construction industry is poised for increased growth in the medium to long-term, which is now giving way to much needed increase in opportunities for the general contractor in the near future. As the industry awaits positive growth, competition for public and private projects is still the number one factor hindering the growth of small to medium businesses.

In such a highly competitive landscape, a general contractor knows that a successful bid is won or lost on their ability to price a bill of quantities accurately against other potential bidders. Yes, your experience on previous projects will count in your favor, but having accurate knowledge in costing building materials, labor and most importantly plant and equipment usage could be the key to your success in winning your next project or tender. A vast majority of contractors are now opting to rent, hire or lease expensive equipment over purchasing as this gives them the ability to be more versatile or agile in the types of jobs and projects they bid on as well as keeping their business overheads and startup costs lower on repayment, maintenance and storage of equipment that is not being utilized continuously.

If your business has the liquidity to purchase decent quality used equipment, that you know won’t become outdated, will be used continuously on upcoming projects and you can extract the value of owning the assets, then it still has its advantages to buy, but for many small to medium contractors and companies trying to break into new markets or bigger projects this will not be the case and hiring is your best and only option.

Key tips when deciding to hire plant equipment

Knowledge is key

Gone are the days were decades of experience gave you the competitive edge as the internet has neutralized that. Research the latest trends in new technology and equipment available, join forums and industry knowledge share groups online or blog websites, sign up to newsletter and become an expert in the field of machinery and equipment. Having a deep routed knowledge in what is happening in the market and what technology is available at your disposal and price at what it will cost you to hire will give you an advantage when costing your next job.

Build relationships

Source and locate plant and equipment hire specialists and conduct due diligence on all the suppliers you are interested in. Visit their premises, inspect their equipment and the age of the equipment and meet the owners if possible, as feeling comfortable and confident with the people and the company you are hiring from will give you confidence in your bids. Always find multiple suppliers in various areas as you will need to factor in transport and delivery costs to and from your job sites. Always check availability of equipment and machinery before bidding on work and having relationships with hire companies that have a range of choice is preferable. Building good working relationships will also give you much greater flexibility in negotiating rates for on future jobs with prospect of continuous cash flow for the hiring company.

Customer Service

A critical factor in the success of reaching deadlines on jobs is making sure that the company you hire from offers excellent customer service such as on-site or off-site training to machine operators and best practices for safety and inspections, as well as quick turnaround of servicing and repairs, or be able to swap out faulty equipment in order to continue with the work at hand. These factors will give you peace of mind as daily costs increase when a job has to stand still due to faulty or broken equipment and can critically impact your bottom line profits and hitting tight deadlines.

Get your paperwork in order

Make sure that that company you hire from, has the correct paperwork for the machinery and equipment you are hiring including insurance. Sometimes overlooked, but important to know what your liabilities will be in the event that any piece of equipment is destroyed or damaged on-site by one of your operators or employees.

As in most cases, there will be Pros and Cons in Buying or Renting Equipment for your next job, but when trying to scale your business effectively by bidding on bigger projects in various locations here is a recap on the advantages of hiring.

  • Lower initial investments
  • No maintenance or storage costs once the project is completed
  • Access to broader range of equipment
  • Use of the latest technology available
  • On-site servicing and insurance handle by another party

 

Sources

Capterra
Equipmentrentalpros

 

If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Storm Johnson

I started my journey with Leads 2 Business in 2016 after having a successful career in aviation. I have since found a passion for the construction industry and helping smaller companies break into the larger scale projects/tenders. I am a devoted Sales Executive based in beautiful Cape Town who truly believes Leads 2 Business is the future for any professional within the construction industry serious about growing to their maximum potential through well researched, up to date leads. Uniting one professional to another creating life long business relationships throughout the construction industry.

Industry Events: 24 – 25 May 2018

Industry Events: Pipes Technologies Conference, Key Principles of Tendering Workshop, Advanced Programme in Project Management (APPM)

Construction Events

Event:

Pipes Technologies Conference

Date:

24 – 25 May 2018

Event location:

Emperors Palace, Johannesburg

Event Description:

Conference will cover pipe systems and latest technologies used in infrastructure applications like water supply and distribution, gas transmission and distribution, drainage and sewerage, road and land drainage

Contact Details:

Tel: +27 11 886 0433
E-mail: getrude@vukanicomms.co.za

Event Details:

Website
Pre-registration


Event:

Key Principles of Tendering Workshop

Date:

21 May 2018

Event location:

Pretoria

Event Description:

South Africa’s premier masterclass on how to submit compliant and winning tenders. This workshop has now been presented to more than 2,000 delegates and with the on-going changes in the tendering legislation companies are advised to continue to align, not only their bids but also their sub-contracting processes with these regulations.

Contact Details:

Tel: +27 82 496 1657
E-mail: gerrit@taranisco.co.za

Event Details:

Website

Event:

Advanced Programme in Project Management (APPM)

Date:

21 & 22 May 2018

Event location:

Pretoria

Event Description:

The advanced programme in project management (APPM) takes you beyond the basic principles of project management and focuses on mastering advanced concepts with the integration of modern technologies and management approaches to the lifecycle of projects.

Contact Details:

Tel: 012 434 2500
E-mail: info@enterprises.up.ac.za

Event Details:

Website

If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Sasha Anderson

Millennial Mom + wife living the hash-tag life. Remember: If You Fail - Fail Forward

Featured Project: Maluti Crescent Redevelopment – Building

Maluti Crescent Redevelopment – Building
The Palms - Building

Description:

Redevelopment and expansion of the Maluti Crescent Shopping Centre (formerly known as Setsing Crescent) in Phuthaditjhaba, in the Free State. The size of the mall, after the addition of 12 357m², will be 34 360m².
The strip mall will be converted to an enclosed mall. Estimated project value: R280 million.

 

Maluti Crescent Redevelopment - Building

Status:

Underway

Category:

Building

Industry:

Retail
Renovations

Sector:

Private

Region:

Free State

Value:

R 280 Million

Timing:

January 2018 to March 2019 (14 months)

Class

Invited / Negotiated

 

If you are a valued Projects subscriber, you can find more details about this Project here
If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Bianca Warwick

I had the privilege of joining the Leads 2 Business content team in January 2012. I work in the exciting Projects department, following the progress of construction developments in KwaZulu-Natal and the Free State.

Under Water and Marine Construction

posted in: General 0

Under water construction

Under water and Marine Construction

So whilst many of us think of underwater construction we think of it as a more modern building technique and we think of all the construction in Dubai, however in fact underwater construction actually dates as far back as to 23 BCE where Roman builders constructed the largest artificial harbour ever built in the open sea to date. Caeserea Maritima, where the remains can still be found.

Under water and Marine Construction

We then have more modern examples of underwater construction like Lake Kariba where construction started in 1955 and was completed in 1959 and cost around 480 million USD.
We also have the world’s first underwater hotel built of the coast of Key Largo Florida which was actually a research facility dating back to the 1970’s La Chalupa Research Laboratory which has been converted into a hotel, named Under The Sea Lodge which opened it’s doors to guests in 1986. This building is completely underwater and is only accessible by scuba diving more than 6 meters down and gaining access via a “moon pool” which is located under the building.
We then have the mega structures in Dubai where they have taken underwater construction to new depths constructing islands and underwater hotels and water theme parks like The Palms and Atlantis.

Under water and Marine Construction

So how does one actually build underwater?
Well you have to firstly create a stable and dry environment in which to build in order to work in the environment and place concrete in it.

We have basically two different methods / techniques in which to build underwater.
Firstly we have Cofferdams, which are temporary structures normally used where the construction area is larger and the water depth less, you also get different types of cofferdams.

  • Earthen cofferdams,
  • Doubled Cofferdams
  • Rockfill Cofferdams
  • Single walled Cofferdams
  • Crib cofferdams
  • Cellular cofferdams

Cofferdams are normally used for constructing bridge piers and other supporting structures

Then you get Caissons which are more permanent large hollow watertight structures which are used for repairing bridge foundations and dams.

Under water and Marine Construction

You also get different type of caissons, namely:

  • Box Caissons
  • Open Caisson
  • Suction Caisson
  • Pneumatic Caisson

A good example of construction using Caissons is the Port of Ngquru just outside Port Elizabeth, which used 5 Caissons anchoring the ends of the breakwaters which required 18 000m³ of reinforced concrete.

So whilst there are different types of underwater construction it remains quite a complex and challenging construction method testing the boundaries of construction in general.

 

If you are interested in becoming one of our subscribers, please visit our website.
To view notes with screenshots on how to use our website, please visit our Wiki site.
To view more articles, please visit our blog.

About Jennifer Ellis

I Started working with Leads 2 Business in 2007 and been based in Port Elizabeth as a Senior account Executive. I oversee the Subscriber base in the Port Elizabeth and surrounds region as well as some National subscribers.

1 84 85 86 87 88 89 90 118