DOI issue:
Anhang
DOI Page / Citation link:https://doi.org/10.11588/diglit.51152#0203
201
ditions and to determine the drop in the water table and the
capacity ofthe water toflow. To carry out earth-static calcu-
lations in the study of the foundations, samplet were taken
from the test pits and boreholes, for examination in a soil
mechanics laboratory.
Martin Thumm
Architectural survey and drawing up plans
Architecturalplans areparticularly indispensable for conser-
vation-restoration surveys and questions about historical
buildings, however, there are no recent, reliable plans ofthe
cloister in St. Michael’s church. Therefore, as part of the
architectural training program for the subject of Building
Documentation at the Fachhochschule Hildesheim/Holz-
minden/Goettingen (Polytechnic of Applied Sciences and
Arts, Hildesheim, Holzminden and Goettingen), plans are
now being compiled. They provide precise maps ofthe age of
sections of the building, accurate spatial representations of
the damaged structures and detailed documentation of the
masonry, including the location and size ofthe stone blocks.
On this basis it will be possible to refer to the building com-
plex in the context of Hildesheims post-war architecture,
which is becoming an increasingly central research theme.
Ivo Hammer
Objectives and methods of examination
and documentation by conservators-restorers
The objective of conservation-restoration is the preservation
of the authenticity and physical existence ofthe monument
or culturalproperty, as a valuable historical source. Conser-
vators-restorers examine the materials and technology of
monuments, their state of preservation and the alteration
processes. The results ofthe examination are combined with
historical and scientific data. They serve as a basis for a con-
servation/restoration concept, which aims to remedy what is
causing the deterioration and preserve the artistic value of
the monument at the same time.
Erwin Stadlbauer, Heike Leuckfeld, Rolf Niemeyer and
Hans-Jürgen Schwarz
Scientific examination of materials
and conservation-restoration surveys
In the preservation of historical structures, scientific exami-
nation ofthe materials and conservation-restoration surveys
often have a particular significance. With severely damaged
buildings, such as the cloister of St. Michael’s church, these
types of examination serve further important aims, apart
from determining the materials and ascertaining their char-
acteristics. They document the condition by mapping the
deterioration, as well as identifying factors causing the dete-
rioration and pointing to preventive measures. The main
topics presented in this section are an examination of the
harmful effects ofhumidity and accumulated salts, as well as
the exemplary methodology used in testing the materials and
an evaluation of their effectiveness in the Conservation of
sandstone.
Jochen Lepper and Karl-Heinz Büchner
Geological aspects of “St. Michaels hilf’
(“Michaelsberg”) in Hildesheim - substrata
and hydrogeological conditions
Hildesheim and its immediate environs were subjected to a
very changeable geological history since the Mesozoic, which
is attested by the different types of rocks in the substrata.
Düring the Keuper (unit in the Triassic), when there were
temporary arid climatic conditions and an amphibious
depositing environment, marlin particular, but also gypsum
and rock salt accumulated. One finds widespread sand depo-
sits, which were left by extensive, inter-connected river
Systems and brackish deltafans. Lias and Dogger are in part
characterised by dark fossil rieh clay. Due to continuous sub-
sidence in the Malm (subdivision ofthe Jurassic), an enor-
mous series oflimestone and marl was deposited. Sandy delta
formations in the Lower Cretaceous record a small drop in
the sea level, before clay and clay-marl rocks were again
deposited in a new period offlooding. Aspart of widespread
tectonic activity, the former lower strata in the Upper Creta-
ceous at Hildesheim were pushed over westerly-lying higher
strata, whereby the whole layered mass in the substrata of
Hildesheim was tilted east-northeast. In the Hildesheim
region the Continentalperiod begins in the most recent Terti-
ary. Düring the Quaternary the Drenthe ice formation left
widespread glacial till as base moraine. Wind-transported
loess deposits and bands ofgravel in the river terraces ofthe
Southern foreland ofthe Weichsel glaciation represent the last
Ice Age.
As a result of this geological history, solid clay deposits of Lias-
epsilon can be found in the substrata ofSt. Michael’s church
today. They were formed by the superimposition ofweathe-
red clay, bolder clay and finally sealing rock from loess loam
and anthropogenic deposits. The different consistencies of
these layers determine the substrata ofSt. Michael’s church.
The high structural load in part causes subsidence and crack
formation in the buildings. In the renovation work, severely
deteriorated parts ofthe building were supported; in addi-
ditions and to determine the drop in the water table and the
capacity ofthe water toflow. To carry out earth-static calcu-
lations in the study of the foundations, samplet were taken
from the test pits and boreholes, for examination in a soil
mechanics laboratory.
Martin Thumm
Architectural survey and drawing up plans
Architecturalplans areparticularly indispensable for conser-
vation-restoration surveys and questions about historical
buildings, however, there are no recent, reliable plans ofthe
cloister in St. Michael’s church. Therefore, as part of the
architectural training program for the subject of Building
Documentation at the Fachhochschule Hildesheim/Holz-
minden/Goettingen (Polytechnic of Applied Sciences and
Arts, Hildesheim, Holzminden and Goettingen), plans are
now being compiled. They provide precise maps ofthe age of
sections of the building, accurate spatial representations of
the damaged structures and detailed documentation of the
masonry, including the location and size ofthe stone blocks.
On this basis it will be possible to refer to the building com-
plex in the context of Hildesheims post-war architecture,
which is becoming an increasingly central research theme.
Ivo Hammer
Objectives and methods of examination
and documentation by conservators-restorers
The objective of conservation-restoration is the preservation
of the authenticity and physical existence ofthe monument
or culturalproperty, as a valuable historical source. Conser-
vators-restorers examine the materials and technology of
monuments, their state of preservation and the alteration
processes. The results ofthe examination are combined with
historical and scientific data. They serve as a basis for a con-
servation/restoration concept, which aims to remedy what is
causing the deterioration and preserve the artistic value of
the monument at the same time.
Erwin Stadlbauer, Heike Leuckfeld, Rolf Niemeyer and
Hans-Jürgen Schwarz
Scientific examination of materials
and conservation-restoration surveys
In the preservation of historical structures, scientific exami-
nation ofthe materials and conservation-restoration surveys
often have a particular significance. With severely damaged
buildings, such as the cloister of St. Michael’s church, these
types of examination serve further important aims, apart
from determining the materials and ascertaining their char-
acteristics. They document the condition by mapping the
deterioration, as well as identifying factors causing the dete-
rioration and pointing to preventive measures. The main
topics presented in this section are an examination of the
harmful effects ofhumidity and accumulated salts, as well as
the exemplary methodology used in testing the materials and
an evaluation of their effectiveness in the Conservation of
sandstone.
Jochen Lepper and Karl-Heinz Büchner
Geological aspects of “St. Michaels hilf’
(“Michaelsberg”) in Hildesheim - substrata
and hydrogeological conditions
Hildesheim and its immediate environs were subjected to a
very changeable geological history since the Mesozoic, which
is attested by the different types of rocks in the substrata.
Düring the Keuper (unit in the Triassic), when there were
temporary arid climatic conditions and an amphibious
depositing environment, marlin particular, but also gypsum
and rock salt accumulated. One finds widespread sand depo-
sits, which were left by extensive, inter-connected river
Systems and brackish deltafans. Lias and Dogger are in part
characterised by dark fossil rieh clay. Due to continuous sub-
sidence in the Malm (subdivision ofthe Jurassic), an enor-
mous series oflimestone and marl was deposited. Sandy delta
formations in the Lower Cretaceous record a small drop in
the sea level, before clay and clay-marl rocks were again
deposited in a new period offlooding. Aspart of widespread
tectonic activity, the former lower strata in the Upper Creta-
ceous at Hildesheim were pushed over westerly-lying higher
strata, whereby the whole layered mass in the substrata of
Hildesheim was tilted east-northeast. In the Hildesheim
region the Continentalperiod begins in the most recent Terti-
ary. Düring the Quaternary the Drenthe ice formation left
widespread glacial till as base moraine. Wind-transported
loess deposits and bands ofgravel in the river terraces ofthe
Southern foreland ofthe Weichsel glaciation represent the last
Ice Age.
As a result of this geological history, solid clay deposits of Lias-
epsilon can be found in the substrata ofSt. Michael’s church
today. They were formed by the superimposition ofweathe-
red clay, bolder clay and finally sealing rock from loess loam
and anthropogenic deposits. The different consistencies of
these layers determine the substrata ofSt. Michael’s church.
The high structural load in part causes subsidence and crack
formation in the buildings. In the renovation work, severely
deteriorated parts ofthe building were supported; in addi-