Crafty Camping – finished projects

You may remember our involvement in a project a few years ago that was featured on George Clarke’s Amazing Spaces:

https://www.abcanchors.co.uk/we-are-on-your-screens/

We have been involved in two projects for Crafty Camping so far – both the Woodsman’s Treehouse and the Woodland Workshop. However, as a supplier of foundation solutions, we don’t always get to see the finished product after our piles have been installed. Luckily, many of our customers keep in touch and like to show us photos of their amazing builds once they are complete.

Thank you to Guy Mallinson for sharing with us!

Confor 2017 – Register your interest

This September, our sister company Autoguide Equipment are celebrating their 40th anniversary, since being established in 1977! This anniversary is important as testament to many years of success and experience in the landscape construction and agricultural industries. Since the Confor Woodland Show corresponds perfectly, we are celebrating at stand, W47, on the 7th and 8th of September.

ABC Anchors will also be featured on the stand, with a tree friendly screwpile foundation system, recommended by the top arboriculturalists.

Autoguide's range of vibrating post drivers will be demoed at the show. Since it is such a special occasion, we are making a limited edition Midi Postmaster. Rubies are of course the gemstone associated with a 40th anniversary, so look out for this as a theme!

In following with our celebrations, we will be giving away a free ‘ruby’ gift to the first 40 enquiries. This will be on both days, so get in quick to avoid missing out! All you need to do is leave your details with your enquiry. If you’d like to register your interest online to save time on the day, please fill out the contact form below.

To keep updated on our celebrations, check our website regularly and subscribe to our newsletter.

We Are On Your Screens!

Save the Dates...

21st September

Dursley Tree House featured on Grand Designs!

Wednesday 21st September 9pm on Channel 4

This project will also be featured in The Sunday Times Homes section on the 18th September and Grand Designs magazine 12th September.

 

 

22nd September

Another to look out for! Woodman’s Treehouse

Thursday 22nd September 8pm on Channel 4

The building of the treehouse was filmed for the first episode of the new series of George Clarke's Amazing Spaces.

ABC Anchors are proud to be involved in these projects as the manufacturer of the piling work needed for the foundations . Dursley Tree House and Woodman’s Tree House are just one example of the solutions ABC Anchors has to offer to most screw pile applications.

Don't miss the opportunity to see our piles in action!

 

 

Tree Roots

Foundations near Tree Roots

"Having specified and witnessed the installation of screw piles I consider they must be one of the most tree friendly foundation systems around. Easy to install from low ground pressure machines working on ground protection they can be installed without material impact to roots."

Jago Keen, Keen Consultants

Disadvantages of conventional Concrete Footings around Tree roots

There are many reasons for not using conventional concrete footings near trees:

Trees will cause desiccation of soils in dry weather and subsequent expansion in wet, resulting in soil movement.

Excavating a trench may well cut through critical roots.

The concrete may have a detrimental effect on the tree, and will certainly reduce the flow of oxygen and nutrients to the tree.

Kew Gardens have shown that the top metre of soil is critical to the health of the tree.

Trees inevitably get bigger so foundation design needs to allow for this.

How do Screw Piles get over these issues?

We arrange for the highest Helix to be at least 2.5m below ground where there is no soil movement, and other Helices will be deeper.

The comparatively slender pile shaft may damage a very small portion of the roots, but the Aeration to the soil round the roots may well actually improve tree viability.

An average pile will be around 4m minimum length, so if we assume that the top 1.5 m of shaft is in soil which moves (up or down) the skin friction will be cancelled by that acting on the lower 2.5m, so resulting in no net movement. Pile capacity does not depend on the skin friction on the pile shaft, it rests entirely on the helices.

Generally structures will be designed to be above the ground, so movement of the soil does not affect the building itself.

Screw piles have both Tension and Compression capacities (about 20-25% more in compression) so can resist any uplift.

Each pile is driven to a specified Torque, and hence known capacity, unlike all other foundations which can only be tested after installation.

Temporary Structures

Temporary Structures

Screw piles make excellent temporary foundations, quick and easily to install and just as easy to remove. Being able to offer instant tensions they are perfect for use as temporary staging, bridges, secure site storage, toilet blocks etc. The removal of the screw piles causes very minimal ground disturbance and piles can often be used again.

We have also used screw piles to support high loads from tower cranes, strand jacks and other vehicles requiring temporary proven solid foundations.

These often have cyclic or reversing loadings. The ability of screw piles to resist both tension and compression plus the low impact of installation and removal is usually key to a successful job.

Transport costs are reduced – 1 tonne of screw piles and extensions can provide 80 tonnes (200 tonnes ultimate) holding power.

Examples

Tents up to 600m2 (65000ft2) are quickly and safely erected using screw anchors, developed specially by ABC Anchors. Tension loads up to 200kN (20 tonnes) are easily accommodated, yet the anchors are quickly removed and reused time and again.

The scaffolding for the temporary roof over the house at Dyrham Park required over 100 screw piles resisting both compressive and tension forces. These piles can be removed and reused once the roof has been repaired.

Concert stages, previously secured using concrete, can now be restrained with hand installed lightweight screw piles.

Wind turbines suit screw piles really well as they can be quickly erected and repositioned if required with very little effort.

 

Blue forest – Belton House Adventure Playground Bridge and Walkway.

This project involved installing foundations for a wooden footbridge and wooden walkway in an area that was very difficult to access with plant machinery and was protected because of listed ruins in the area. The area was also extremely boggy and could only be accessed for a short period between the wet seasons.

All these restrictions meant that the majority of the foundations would have to be installed by hand and all the equipment would have to be brought to site manually.

It was decided that this project could be undertaken using our 60R piles and installing them with the 400H hand held torque head.

For the bridge abutments we installed 6 screw piles at either end onto which a reinforced concrete slab was poured. The screw piles had to be installed to 5m deep to ensure they were in good quality stable ground. Great care had to be taken not to damage any tree roots in the top 1-2m of soil.

The boardwalk piles proved to be even more of a challenge due to the pile positions being in a partially flooded area of natural bog. The only access was via a temporary wooden sleeper bridge which was only floating on the saturated land.

One row of piles was 4m to the side of the access bridge which made it impossible to reach using the 400H hand held unit as before.

It was decided to use a 3t mini digger to install these 12 piles but it was touch and go whether or not the temporary bridge would take the weight of the 3t machine. Careful manoeuvring and a skilled driver proved that it would be possible to install the piles in this way.

Additional sleepers had to be placed into the bog to allow the digger to reach out the 4m to the pile position and once the pile tip was installed into good ground the excavator could then use the pile for support.

The 12 piles were all installed to 6m deep before adequate torque was reached.

This challenging installation proved a great success as the 12 piles now form the base of a spectacular wooden walkway over an area of natural marshland.

 

Bridge Foundations

Bridge foundations

Installing bridge foundations is inherently an interesting challenge but convenient because loads will be known. River and watercourse banks are usually soft although there may be hard gravels or boulders a few meters below water level. Temporary bridges also benefit from screw piles as they can be easily removed and reused.

Piles can be protected against corrosion using a variety of tested solutions and may have relatively large diameter final extensions to give sufficient lateral and vertical resistance. We produce piles with working loads up to 250kN on a regular basis with much larger capacity available if required.

The additional benefit of using raked screwpiles is that increased support is provided for river banks. They are also particularly useful where the avoidance of cement is an environmental benefit.

Example

An early project was to create foundations for a footbridge in an area renowned for winter floods which had washed earlier bridges out to sea. The soil included small boulders up to 300mm diameter down to 3m deep. Thereafter the soil was very soft until a depth of 12m when strength improved significantly. 89mm piles were driven to maximum torque at depths of 14-15m and despite the bridge being  occasionally submerged 3m deep the foundations and bridge remain intact.

Underpinning – Conservatory

A conservatory which had been unsuccessfully underpinned using concrete, has now been restored to its original level using 60R helical screw piles.

Initial soil tests indicated that competent ground would be located at approx. 2m depth. However, inspection of the failed foundation and the local presence of trees shed some doubt on this information.

Pile installation was very quick with all equipment hand portable on site.

On this site conventional foundations looked OK but were in fact terminated just above a layer of poor ground.

A two man crew took 1½ days to complete the operation.

Piles were positioned to avoid a number of underground services/utilities.

 

Using the ABC 400H hand held driver, which has a continuous torque read out, our operators discovered that the competent ground overlay a 2m thick band of soft material. The piles shown were driven to depths of 5-6m before achieving satisfactory installation torques and standard underpinning brackets were then installed and carefully jacked using our 40KN/pile system.

The photos show the ground beam has now lifted from the conventional concrete underpinning and is restored to its original level.

Foundation Repairs

Foundation Repairs – Underpinning

Subsiding properties are becoming more common, this is due to new building and extensions being built on insufficient foundations or shallow footings on clay soil. We have developed a system which can stabilise the subsidence and in some cases lift the buildings back to its original level.

The process involves digging around the outside of the failed foundation to expose the base of the concrete foundation. Pockets are then dug under the foundation at 0.8m-1m ctrs. Where the pockets have been dug, screw piles are now installed to torques in excess of 3kNm. Piles need to be installed into stable ground. Jacking plates can then be fitted to the piles and lifted using hydraulic jacks. Once all of the piles are preloaded equally, the process is complete with the building stabilised and in some cases back to original levels. Trenches can now be backfilled with soil or type 1 if extra support is required.

Key Features

Can be hand installed for sites with limited access
Minimal disruption to property and surrounding area
Noise and vibration free operation

We have worked with numerous window companies to support and lift subsiding extensions and conservatories.