Parthenon |  Erechtheion |  Propylaia |  Athena Nike |  Arrephorion |  Circuit Walls |  Scattered Architectural Members | 
Interventions Completed |  Interventions in Process |  Cliff Slopes | 

Ιnterventions Completed

    Continuous repairing of the walls has contributed to their preservation to date. Yet structural damage, such as cracking, gaps and extreme deformations are evident in many parts of the ancient construction, just as in the more recently repaired sections.

 

    During the past 25 years, the condition of the walls has been systematically monitored and the problems noted have frequently been reported. During this time a strategy and programme of an interdisciplinary approach has been formed in order to deal with the problems. To begin with, primary emphasis was placed on documentation of the form and state of preservation of the walls, in order to build the necessary database for evaluating and estimating any future intervention.


    The intervention programme was concerned with the monitoring of structural damage in the walls. Following research on various methods of instrumental monitoring of the micro-movements, it was decided to use a combination of mechanical methods and other recording systems of advanced technology. For this purpose mechanical crack meters were installed on cracks in the walls. The information they provide is local but very useful, since they gather reliable information as to whether and to what extent the cracks are "active".


    Additionally, in terms of monitoring the circuit wall, a pilot program including installation of optical fibre sensors has been realized. These sensors aim at the measurement of strains induced from mechanical or thermical actions in characteristic areas of the wall. Optical fibre sensors are the state of the art in strain monitoring and provide extremely high accuracy. They have been developed mainly around the SE corner of the wall as well as in a certain area of the North Wall in the proximity of Arryphorion filling, where the circuit wall appears intensely deformed. Following this pilot phase, the monitoring program with optical fibre sensors is to be expanded to larger areas of the circuit wall.

 

    Additionally, in terms of monitoring the circuit wall, a pilot program including installation of optical fibre sensors has been realized. These sensors aim at the measurement of strains induced from mechanical or thermical actions in characteristic areas of the wall. To be noted that optical fibre sensors are the state of the art in strain monitoring and provide extremely high accuracy. They have been developed mainly around the SE corner of the wall as well as in a certain area of the North Wall in the proximity of Arryphorion filling, where the circuit wall appears intensely deformed. Following this pilot phase, the monitoring program with optical fibre sensors is to be expanded to larger areas of the circuit wall.

 

    At the same time, an underground non-expanding INVAR wire has been installed between the stable foundation of the Parthenon and the south wall. A network of observation points has also been established on the south and east walls for monitoring the micro-movements. The use of electronical systems (crack meters, inclinometers, load cells) for automatic and continuous recording of high accuracy comprises the fourth system of instrumental monitoring that has been programmed.

 

    In order to have full geometrical documentation of the existing condition of the ancient walls, a photogrammetric survey and a process of three-dimensional (3D) scanning of the walls have been realized. Recently a geophysical research of the wall surfaces (electrical tomography-radar) was completed aiming to the investigation of the invisible surfaces.

 

    In addition to the use of technologically advanced methods, optical inspection is always a reliable method for directly evaluating the most troublesome areas. Access to these is by means of a suspended work platform accommodating two people. Using this platform it was possible to obtain surveys of the cross-sections and deformations of the walls, using traditional methods. This can be combined with weeding, the removal of accretions from the drainage system and, in some cases, improving the drainage system.


2011 YSMA
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