Value setting and renovation city wall city wall city of Blankenberg - structural work, wall and civil engineering work

Building Ensemble City Wall City of Blankenberg

The castle and town form a four-part, large-scale fortification with a landscape-shaping effect.

Built around 1150 to 1181, the main castle occupies the spur peak as the core of the height fortification and is

surrounded on three sides by steep slopes. Its buildings, built from local greywacke, are up to two

Towers and wall remnants are eroded. The outer castle, the old town and the new town lie on the widening upper

back of the mountain spur. In front of the shield wall of the outer castle, the old town was built as a castle spot around 1200

erected. It was abandoned in the 1st half of the 17th century. Since then used as a garden and

The area used for pastureland can be seen from the remains of the fortification wall. Following the

Old Town, the new town was built with its defense dating back to the 1st half of the 13th century, which

has largely been preserved to this day.

The entire castle and town complex is one of the largest preserved medieval fortifications

in West Germany. The walled cityscape, the silhouette and its embedding in the

Cultural space and the landscape of the Sieg Valley establish the value of the monument. Particular importance is

Blankenberg as a testimony to the founding of the city in the Rhineland in the 12th and 13th centuries.

The services described for wall sections M13 and M14 are part of the repair measures

on the medieval city wall of the city of Blankenberg, a registered ground and architectural monument.

It is therefore essential to take into account the best possible preservation of the existing building fabric.

The basis of the renovation concept is to secure and preserve the historical building fabric as far as possible

this is possible and economically justifiable according to the current state of restoration technology. The

The construction project is accompanied by monument protection. When carrying out the project, the law on

to protect and maintain the monuments in the state of North Rhine-Westphalia (DschG) in the currently applicable

version to be observed. The planned renovation work requires the greatest expertise and care in

execution of the work.

The construction site equipment area is located in the landscape and nature reserve. The attached site plan

the access possibilities to the construction site equipment areas can be found. It is strongly recommended that you consult in detail with the local

to familiarize the situation by a site visit. Measure valorization M13/14

The repair work on the natural stone surfaces of sections M13 and M14 serves the

Maintaining the substance of the city wall and the materials used.

The wall section is divided into three sections:

M13: City wall at the garden site Mechtildisstraße 1

M14 I: Cologne Gate

M14 II: City wall below the residential building Mechtildisstraße 1

The present measure concerns the corner situation of the city wall in the western area of the property

Mechthilidisstraße 1/Cologne goal in Blankenberg. The wall section is no longer considered stable and must

therefore be repaired statically. A total of 44 anchors are needed from the two outer sides of the wall

which make core drilling necessary in advance. A section of the north wall is

also pre-stressed with the help of a shotcrete shell and anchors. After restoring the

Stability is dismantled by a supporting pillar on the west side (modern addition). Only after

restored stability, the garden plot can be entered on the inside of the wall. grout

and masonry are repaired in the following and the shotcrete shell is additionally equipped with a

Faced natural stone shell (including foundation). Before work, digs of max. 1 m must be done on both sides

Width and 1 m depth are necessary to be able to process the masonry in the ground-wetted area.

In consultation with the LVR Office for Soil Monument Preservation, a commissioned archaeologist will determine the measures

accompany and document.

Work on the respective wall area is to be expected to come to a standstill, insofar as the archaeology findings

must document carefully. If possible, work should be continued on other sections

be continued.

In the run-up to the measure, grubbing-up work was already carried out in the vicinity of this

section of the Wall. Further individual green cuttings must be carried out as required.

Rough construction process:

1.Site installation and preparatory work

2. Shotcrete work

3. Drilling and anchoring work (wall protection)

4. Demolition work on the masonry pillar on the northeast corner and in the garden of Mechthildisstraße 1

5. Earthwork and Exposure plinth area city wall

6. foundation work M13

7.scaffolding

8. Natural stone repair including wall crown

9. Kölner Tor Wall Crown Training

10. Veneering work on shotcrete shell

11. Wíeder making garden plot