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Fastenings for the refurbishment of monuments and old buildings

Renovation and reconstruction of historic buildings.
Fastenings for churches, castles, fortresses and other listed buildings.

We supply both the new lean duplex stainless steels, such as 1.4362, and the familiar materials 1.4404 (A4), 1.4401 (A4) 1.4571 (A5), 1.4541 (A3) and 1.4301 (A2). All these materials have very high resistance to aggressive environmental influences (corrosion). Stainless steel is particularly ideal for fastening and cladding structures for churches, cathedrals, castles and fortresses, where the aim is to preserve the structural fabric for hundreds of years. Over the course of time, damp penetrates virtually every area of the old structural fabric and causes key loadbearing elements (fastenings made of steel) to corrode. This also applies to galvanised steel because the thin layer of zinc does not have long-lasting resistance, especially in damp masonry or the damp alkaline environment of mortar and concrete!

Your advantages at a glance:

  • Planning and design support from our partner, the civil engineers ASTATEC GmbH & Co. KG
  • With our wide range of machinery and extensive stock of input materials, we can also manufacture special structures and customised products, from one-offs right through to series production
  • Specialist welding firm with a manufacturer's qualification Class E and other certifications, see "Certifications and Approvals"
  • We have many years of experience in the manufacture of fastening structures for the restoration of historic buildings/monuments (see references, e.g. Frauenkirche in Dresden)
Fastenings for the refurbishment of monuments and old buildings

Product information

  • Fastening plate thicknesses
  • Tension anchor - round diameter**
  • Thread diameter
  • Edge profiles
  • Profile lengths

up to 150 mm
up to 60 mm
up to M 56
up to a thickness of 20 mm
up to 14 m
Fastenings for the refurbishment of monuments and old buildings

Use and application

  • Tension anchors, pull anchors
  • Supporting profile and lattice constructions
  • Diagonal crosses, retaining plates, ornamental panels
  • Needle anchors, threaded bars, ribbed tor steels
  • Twist clamps for windows
  • Fastenings for wooden beams
  • Mortar support anchors, paddle anchors
  • Substructures for spires and domes
Inner structure of the "Rathausmann" (Golden Town Hall Figure) in Dresden
... the old supporting structure had rusted through
... Modersohn made a replacement
... based precisely on the three-dimensional model
... everything fitted perfectly, and the head was securely attached
... more than 70 metres up - on top of the town hall tower
In our welding shop - welding engineer Prof. Dr.-Ing. Busch, welding expert Mr Gottwald and welder Mr Dyk checking the weld seams of the supporting structure for the Rathausmann
Central support column for the Rathausmann after surface blasting, prior to delivery
Reinforcement structures and arm fastenings of the Rathausmann prior to delivery
Mr Rath, from our production team, finish the "Kaiser's rod" for the Dresden Frauenkirche,
... the fastening rod is very long and sturdy, made of Mat. 1.4571,
... designed to hold the top wooden structure of the lantern together and to serve as a substructure for the church cross
From the needle anchor in the lower masonry through to the fastening of the lantern - the copper-plated dome,
... most of the stainless steel fastenings in the Dresden Frauenkirche
... were produced by Modersohn of Spenge, Germany - the specialists for heavy-duty fastenings in the construction industry!
Renovation at the Volksbühne theatre in Berlin: the entire supporting structure made of standard steel had rusted,
... that will not happen with the new supports made of lean duplex stainless steel 1.4362
Twist clamps as window frame in Brackwede Church (Bielefeld, Germany)
Threaded bars with spacers for optimum grouting with mortar in the drill hole
Diagonal/anchor crosses on a church tower
MOSO paddle anchor for transverse pull loads on the masonry
Retaining plates for tension anchors with turned ornamental groove, Surface blasted (left) and scale-free, fleece polished (right)
Support girder in a church nave to prevent the roof beams from being forced apart
Ornamental rosette from a 1906 photo for a handrail on a restored fountain
Fastening ring made of lean duplex stainless steel for the base of the Hercules statue in Kassel
Support frame for lion statue in Berlin

Pull anchorages
In the case of pull anchorages, it is necessary to clarify in advance how long the tension bars need to be and how the end and connecting links are to be designed. We can also supply very large thread cross-sections. Tension bars can be any length, provided that they can still be transported and installed. We are certified to manufacture welded joints for common round steel dimensions without X-ray or ultrasonic tests.

In contrast to the threaded bars that we stock in lengths up to 3000 mm, the double-ended tension bars are made of round steel and have partial threads at both ends. The double-ends are most often 5 – 8 metres long and have a diameter of 20 – 42 mm.

For the connecting links, you need to clarify whether you require these as a clamping connection (clamping sleeve with right-hand/left-hand thread) or merely as a joint with right-hand thread only (coupling sleeve). You can also use a simple, less expensive coupling sleeve if the clamping process can be performed at the ends of the pull anchorage (at the end plates) on the masonry.

 

Tensioning structures
With tensioning structures, it is important to ensure both correct force transmission and ease of installation (e.g. when mounting in narrow building recesses).

 

End plates
We manufacture diagonal crosses, round or rectangular ornamental tie plates, as well as simple retaining and pressure distribution plates. With our plasma cutter, we can cut metal plates up to a thickness of 110 mm in stainless steel. As a rule, plate thicknesses are between 20 mm and 40 mm, depending on the structural analysis and the strength of the masonry.

 

Profiles, carrying and supporting structures
We manufacture profile structures on our folding presses up to a material thickness of 20 mm. For large strut-and-tie structures and thick profiles, we have a certificate for welding in accordance with DIN 18800-7 = "grosser Schweißnachweis". While we can also procure rolled or drawn profiles, we do not recommend this due to the frequently high input material price and long delivery times.

 

Needle anchors
We have an extensive stock of ribbed tor steel in stainless steel V4A (1.4571) up to a diameter of 14 mm and lengths up to 6000 mm. We can also procure larger ribbed tor steel diameters and lengths, but these are not certified by the German Institute for Building Technology (DIBt). Instead of the ribbed tor steel, we can also supply cut threaded bars.

 

Twist clamps
For the framing of glass, we manufacture thick flat steels with mounted bolts. As an abutment, we use a thinner flat cut part with round holes. Using our laser system, we can also manufacture round or otherwise shaped
glass frames.

 

Fastenings for wooden beams
We supply appropriate stainless-steel fastenings for wooden beams.
- support shoes
- column shoes
- mounting bracket
- nail plates
- drifts
- wood screws

 

Technical support
Our partner, civil engineers ASTATEC GmbH & Co. KG will help you to find the solution to a wide range of fastening problems.

Keywords / Related terms: tension anchor, pull anchor, needle anchor, guide anchor, diagonal cross, twist clamp, paddle anchor, ornamental panels