Environmental Engineering Reference
In-Depth Information
4.7
Chemical welding
also, in specific areas, those rocks that had risk of
falling, and were not large enough to stand a micro
bolt, were sealed between them with a powerful
epoxy adhesive. Thus large superficial areas of the
vault were tied together.
4.8
Aesthetic recovery
several works were carried out to return or even
increase the aesthetic beauty of the cave. Firstly
Figure 9.
Final aspect of the rock.
the sealing of the ends of the bolts were carried
out with a stone mortar of the same color of the
environment, elaborated with natural stone from
the place and epoxy resin. Then a mastic with suit-
able color was prepared and implemented to hide
the chemical welding. also other aesthetic treat-
ments aimed to minimize the impact of previous
anthropic action.
4.9
Generalized treatment of mineralization
once earlier works were finished, a mineralizing
product was applied with airless. its mission was
to improve the surface characteristics of the rock
to avoid dust from the ceiling falling.
This product penetrates into the pores and
capillaries of the element to be treated reacting
with terrain oxides and carbonates resulting in the
formation of insoluble crystals.
5
conTRols DURinG The eXecUTion
Figure 7.
setting in place of small bolts.
Before the beginning of the work, and during its
development, a strict control of materials and
execution was carried out. Perhaps highlights its
importance the breaking test of the bolts. By doing
them the values supplied by the manufacturer
were checked and at the same time the adhesion
force achieved in field was checked. Both values
exceeded the design values.
as a precaution, during the work, a topographic
detailed control was done.
During the remove of the falsework of the stra-
tum improved with the lightweight concrete slab, a
control in surface was carried out by 3 clinometers
next to the area of major overhang. The interior of
the cave was controlled, with the same accuracy,
possible movements with topographic equipments,
not detecting any movement.
Figure 8.
chemical welding.
