290420845

W.X. Huang and X.Z. Chen (Orał discussion)

TIGER HILL PAGODA OF SUZHUO, THE PISA OF CHINA

Tiger Hill Pagoda of Suzhou, China was built around 959-961 AD.. It has 7 stories and its total height is about 47.1m. The piane of the pagoda (Fig.1) consists of an hollow octagon with 8 exterior or wali columns and 4 interior columns. The thickness of the wali is about 1.8m, and the base width of the pagoda is about 14m.

Fig.2 Tiger Hill    Fig.3 Plurab Linę

Pagoda of Suzhou    showing inclination

of 7th Story.

Fig.1 Cross Section through the Base

Story, as well as the Foundation Piane of the Pagoda.

Brick was the only materiał used for construction. The total weight of the pagoda is estimated about 5000 tons. Both the wali and interior columns were directly built on a layer of broken brick and clay mixture of about 1.Ora thickness with no extended footings. Below this supposed foundation base is a layer of broken brick and stone of about 1.Om thickness, and further underneath is a layer of clay and broken stone mixture with a thickness of 1.57m. Between this layer and the sloped base rock, which is inclined with a slope of about 1:5 from south towards north, is a layer of light clay mixed with some rocks and boulders. The maximun thickness of this layer which occurs on the northern side of the pagoda reaches 2.27m. Thus the total thickness of the compressible stratum underneath the pagoda varies from about an

F. Lizzi (Orał discussion)

THE LEANING MOSUL MINARET RESTORATION WORKS

La Consolidation Statique du Minaret Penchant de Mosul

(Iraq)

The AL-HADBA Minaret in Mosul (XI century) is well known all over the world as the "Pisa Tower" of the Middle East (fig. 1).

The progressive inclination of the structure threatened, lately, very seriously its stability and asked for imraediate intervention.

The restoration works, designed by the Italian Company FONDEDILE S.p.A. and carried out in approx. 10 months (1980-81) by the same Firm, consisted in (figg. 2 and 3): estimated depth of 2.4-2.8m on the Southern side to 5.8m on the northern side of the pagoda. This difference in the thickness of the foundation soil stratum raay be the principal cause of the tipping of the pagoda.

In the memory of the people this tower is always inclined. The displacement of the top from the plumb linę passing through the center of the foundation base now reaches 2.32m (see Fig.2). The inclination is towards NNE. 2 interior columns and many door openings are badly cracked, thus restoration appears to be imminent to most engineers.

It was recorded in history that the 7th story has been reconstructed in 1638 AD, but this story has now been found also inclined towards NNE. (see Fig.3). This indicates that during the past 340 years the tipping of the pagoda is still continuing. This pagoda has been restored many times sińce its construction, but no detailed record has been found. In 1957 this pagoda has been strengthened with reinforced concrete loops, thus the total weight of the pagoda has now been increased 520 tons as compared with the original. Restoration by underpinning and other foundation treatment measures are now under active study.

Acknowledgement is due to Prof. T.M. Yu, Mr. Y. Z. Tao, Mr. J. Zhao, Mr. Q.L. Pan and the Commission of Historie Relics of Suzhou for their cordial assistance in the preparation of this manuscript.

-    the masonry reinforcement with a network of steel bars grouted in the walls ("reticolo ce mentato"), in order to obtain some sort of "reinforced masonry";

-    Underpinning, carried out with "pali radice" (also known as "root piles", "micropiles", "pieux racine", "Wurzelpfahle", "estacas raiz" ecc.) according to the original patent9 obtained by the Author in 1952.

The number of piles was proportioned to the

53 Vo!yme 4

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