Church Restoration

Renovation and reconstruction of historical buildings

Fortifications for churches, castles, palaces and other listed buildings. In addition to the new Lean Duplex stainless materials D4 (such as 1.4362 since June 2011 the even more powerful 1.4062, resistance class III, Z-30.3-19), Modersohn also offers the well-known material types 1.4404 (A4), 1.4401 (A4) 1.4571 (A5), 1.4541 (A3) and 1.4301 (A2). They all have a very high resistance to aggressive environmental influences, e.g. corrosion. Stainless steel is the ideal material, especially for fastening and cladding constructions for churches, cathedrals, castles and palaces, whose building fabric is to be preserved over centuries.

In the course of time, moisture penetrates into almost every area of old building fabric and corrodes important load-bearing components (steel fastenings). This also affects galvanised steel, as the thin zinc layer has no permanent resistance, especially in damp brickwork or in the damp alkaline environment of mortar and concrete!

In the case of tension anchorages, it must be clarified in advance how long the tension rods and how the end and connecting links are to be designed. Modersohn also offers very large thread cross-sections. The tension rods can be as long as they are still transportable and mountable. Modersohn has the approval to produce welded connecting joints for the common round steel dimensions without X-ray or ultrasonic testing.

In contrast to the Threaded rods, which Modersohn keeps in stock up to a length of 3000 mm, the double-ended tension rods are made of round steel with partial threads on both sides. The most common double ends are 5 - 8 metres long and have a diameter of 16 - 42 mm.

For the connecting links, it must be clarified whether they are designed as a clamping connection (clamping sleeve with right/left-hand thread) or only as a connection joint with right-hand thread only (connecting sleeve). The use of a simple, less expensive connecting sleeve is possible if the tensioning process can be carried out at the ends of the tensioning anchorage (at the end plates) on the masonry.

In addition to the correct transmission of force, special attention must be paid to good mountability (e.g. for installation in narrow building niches).

Modersohn manufactures St. Andrew's crosses, round or square decorative plates and very simple holding and pressure distribution plates. With the 6,000 bar Water jet cutting machine sheet, metal plates up to a thickness of over 150 mm in Stainless steel can be processed. Usually the plate thicknesses are between 20 - 40 mm, depending on the static dimensioning and load-bearing capacity of the masonry.

Modersohn manufactures profile constructions on its press brakes up to 20 mm material thickness. For large bar constructions and very thick profiles, the company has the manufacturer's qualification in Joining Technology according to DIN 18800-7 = major welding certificate. Rolled or drawn profiles can also be procured, but are often not recommendable due to their high price of pre-material and a long procurement time.

Modersohn has an extensive ribbed steel bearing in Stainless steel 1.4571 (A5) and 1.4362 (D4). Frequently, ribbed steels with rolled or cut thread at the end of the rod are also used. Alternatively, Threaded rods in lengths of up to 3 m (in stock) can be used for needling. Advantage here: Anchor plates or force deflection constructions can be screwed on immediately.

For the glass edging Modersohn manufactures thick flat steel with attached bolts. A thinner flat blank with round holes serves as abutment. Modersohn can also produce round or differently shaped glass edgings using our laser system.

At Modersohn you can obtain the matching wooden beam fastenings in Stainless steel:

•     Supporting shoes
•     Column shoes
•     Mounting bracket
•     Nail plates
•     Passdorn
•     Wood screws