|fa’atino, fai po’o fau||to make or build|
|auala lalo ole laupapa||tunnel|
|ia saogalemu, leai se faafitauli||be safe, risk-free|
|lalo ole fanua||underground|
Building a Safe Tunnel
A lot of work must be done to design a safe tunnel, prepare the site, and move underground pipes.
Digging deep into Buckle Street
- The tunnel is not being bored through rock
- The tunnel is a concrete box in a trench sometimes called a “cut and cover” project.
A 300 metre long trench has been dug into Buckle Street.
- The trench is 18 metres wide
- The trench is 12m deep at the sides for drainage and 10m deep through the middle
- It will take 4,200 truck and trailer loads to take the soil away (38,000 cubic metres)
- The soil is taken to a landfill where it can be used in other projects.
Many pipes carrying services to homes and businesses are buried in the ground beneath Buckle Street.
These pipes carry;
- storm water
These services have to be moved out of the way so the trench can be dug for the new tunnel and road;
- Using a digger might break the pipes
- To avoid damaging the pipes, water is sprayed onto the soil around the pipes
- The slushy water and soil is sucked up by a giant vacuum cleaner
- The exposed pipes can then be safely worked on.
Underneath Buckle Street is a 100 year-old sewer pipe;
- The sewer is made of bricks and is nearly a metre high
- It will not be moved
- It comes close to the new road at one point and extra care is being taken to protect it.
Making a Safe Tunnel
The tunnel and the road for the National War Memorial Park Underpass have been designed with people’s safety in mind.
- Earthquakes in the past have lifted up the land in Wellington
- The engineers are designing the tunnel to make it safe from earthquakes
- The tunnel will be anchored to concrete piles that will go down to the bedrock (10–30 metres)
- At first the engineers were going to use straight piles
- They have now decided to make piles with a bell-shape at the bottom
- The bell-shape designed will help the tunnel withstand a 1-in-2,500 year earthquake.
The engineers are making plans in case there is an accident or car breakdown in the tunnel;
- Closed circuit cameras will keep an eye on what is happening
- The cameras work 24 hours a day, seven days a week
- They alert emergency services if anything goes wrong.
Safety on the work site
A wall protects the workers and keeps the soil in place while the tunnel and road are being built
- The retaining wall is made from steel kingposts with timber poles slotted in between
- This wall holds the trench open for the tunnel and the road to be built
- Another wall of interlocking steel sheet posts protects the foundations of the historic Mount Cook Police Barracks and an apartment building
Keeping safe is important on the work site.
- There are cranes, diggers and loaders moving around where people are working
- The Memorial Park Alliance employs a safety manager who makes sure everyone knows how to work safely around machinery.
langa to make or build tafu tunnel malu be safe, risk-free teuteu preparation hala road keli dig, excavate lalo fonua underground
Cook Islands Māori keywords
anga to make or build tāana tunnel meitaki be safe, risk-free ma'ani preparation ara road keri dig, excavate raro ‘enua underground
talaga to make or build hala he lalo kelekele tunnel faka haohao, ua fakahanoa be safe, risk-free folafolaaga, amaamanakiaga preparation puhala-tu road laga, keli dig, excavate lalo fonua underground
Digging begins for the underpass construction site trench. Image: NZTA.
The tunnel is being constructed as a concrete box in a trench and is known as a ‘cut and cover’ project. It is not being burrowed through rock. Image: NZTA.
The tunnel will be anchored to 30-metre deep concrete piles to protect it in case of a major earthquake. Image: NZTA.