**11. 'Secret fix' versatility**

In the UK historical bridges and buildings have also had their structural integrity enhanced and preserved using digital models to work with the Cintec Anchors

*Digital Technology to Preserve Heritage Structures DOI: http://dx.doi.org/10.5772/intechopen.99023*

**Figure 23.** *The threatened Chongquing gate to be preserved and strengthened*.

**Figure 24.** *The 3D model of the Cintec 'secret' anchor strengthening of the gate.*

'secret fix'stitching reinforcing anchor system, as demonstrated in the St. Aubins breakwater examples in Section 4.

When modernising areas of city centers for example, façade retention has also been required in terms of Heritage and Planning to enable modern buildings to be constructed within or behind the Heritage façades. The new structure can be tied to the façade to be retained by using these methods.

#### **12. Archive information equally important to record**

An important aspect of the accumulation of the digital data work prior to commencing an investigation or study involves obtaining as much historical data from archives, drawings and records obtained from any available source. A good example recently of this whole sequential process and has been the Principal

**Figure 25.** *The damage to the slender Yongying bridge*.

**Figure 26.** *3D model of the Cintec 'secret' anchor strengthening scheme.*

Engineer's inspection of the Elizabeth Castle Breakwater in St. Helier, Jersey (**Figure 29**, also refer back to **Figures 17** and **18**, Ref. [9], Vid Ref. [4]).

This structure was conceived and constructed in 1860s by the English Victorian era engineer Jonathan Coode (**Figure 30**). He developed in the course of designing the breakwater a new innovative method for constructing new concrete blocks instead of using large granite stone blocks to construct the Elizabeth Castle Breakwater (**Figure 31**). It was also discovered in other archive records on the Island that at about this same time, he was able to construct the first concrete lighthouse on the island of Jersey at Corbiere (**Figures 32** and **33**).

*Digital Technology to Preserve Heritage Structures DOI: http://dx.doi.org/10.5772/intechopen.99023*

**Figure 27.** *LiDAR scan of the white pagoda surface erosion.*

## **13. A unique access and records problem and location resolved by drone survey**

The work to preserve and protect the lighthouse at Corbierre in Jersey (**Figure 32**, Ref. [13], Vid Ref. [5]) has also involved LiDAR scanning common archive research and drone surveys to assess the inaccessible damaged surface coatings to the very first cast concrete lighthouse erected during the UK's Victorian era in the 1860s (**Figure 33**). Access there is only gained by a causeway at low tide and is in at a very dangerous rocky part of the Channel.

## **14. Another unique remote location challenge**

In terms of circumventing dangerous rocks and restoring Heritage value to a site, the recent work to assess and design the repairs to a sea wall at Les Minquiers, a rock archipelago 20 km south of Jersey, between the island of Jersey and mainland of France, has relied heavily upon a drone survey (**Figure 34**, Vid Ref. [6]). This particular dangerously rocky outcrop of islands forming an archipelago of unique flora and fauna is virtually inaccessible unless by light small boat (**Figure 35**). Previously there had been no surveys or any drawings done of the main island itself or the fisherman's shelter cottages that had historically been built on the island (**Figure 36**). The ability to replay and 'pause' the drone video enabled the difficult and remote access parts of the failed

**Figure 28.** *Model of the structure for analysis.*

sea wall to be studied and modelled so that a Heritage and environmentally sensitive repair and rebuild could be achieved.
