In Essen at the Bäckerstraße a new reinforced concrete pavement over 500 m² had been set too high. Since this required correction, the Senft company got the order to carry out the concrete milling. Within one day the works were completed. The pictures show how accurately and carefully the B25 concrete was milled off. The client was very surprised that the works were finished within a single day.

Since very high standards prevail at the airport, only qualified and safety examined mechanics are allowed to work there. As Senft GmbH disposes of all the necessary admissions and safety test certificates, we were chosen to carry out this building project.

120 reinforced concrete girders were disjointed and dismantled by means of a wire saw. Here a wire saw was used for the sawing of reinforced concrete girders in the smallest possible space. The cross-cuts had cross sections of 0.90 x 0.85 m and a very high proportion of steel.

We received an order from the DEG company in Koblenz to remove 5,000 m² roof surface from their site. We dismantled and disposed of asbestos cement slabs with a total weight of approx. 110 t.

In the City Hall Centre of Bochum 3,000 t reinforced concrete ceilings, girders and columns were removed across 2 floors in order to create an atrium. Due to lack of time the works were carried out non-stop in day and night shifts.

In Dortmund we dismantled and disposed of 8,000 m² roof covering composed of asbestos cement slabs in cooperation with a roofing company. Approx. 500 m² were cleared up per day and covered with new material. The discounters located underneath the roof remained open for the customers without restriction.

In the municipal sewer system of Cologne cross-cuts up to a diameter of 2.10 m were constructed from the main sewer (dia. 3.60 m) to other sewers running in parallel by means of wire sawing and core drilling operations.

Concrete sawing and demolition works in an enterprise located in Dortmund.
Shows flush sawing (here flush to the floor) among other things.

16,500 m² roof covering, roof planting, roofing membranes and roof insulation were professionally removed and disposed of. The operations were carried out under regular business with the highest possible care while avoiding noise!

2 carottages in masonry of Ø 800 mm for installation of windows in a jeweller's shop in Recklinghausen

We had to saw reinforced concrete walls in the new port of Duisburg to the effect that our client would be able to discharge his loads more quickly from the ships arriving every day.

In Hamburg a 4 floors high air-raid shelter was converted into a residential and office building. We received the order for the concrete sawing works. Our task was to form openings in reinforced concrete walls in the dimensions 2.50 m x 3.50 up to 4.50 m x 5.00 m. The wall thicknesses were 1.10 m up to 1.20 m.

BWE Duisburg - 2,800 m² asbestos slabs including the substructure and mineral wool insulation were removed and disposed of in a residential building in compliance with all corresponding regulations. Furthermore sawing off, demolition and disposal of 24 balconies built of reinforced concrete.

All services from a single source!
In an enterprise in Neuss 490 m² of an approx. 20 cm thick intermediate ceiling built of reinforced concrete were sawed up, dismantled and disposed of. In addition we dismantled 1,800 m² plasterboard partitions including insulation. Furthermore we removed 600 m² carpeted floor and hereafter ground all glue and carpet residues over the entire surface down to the concrete floor.

BUT Duisburg.
Here 200 linear metres of former ore bunker walls built of reinforced concrete with a thickness of up to 1 m were sawed off in a height of 8 m and at an inclination of 5°.

Alteration „Kleines Haus" at the Schauspielhaus Düsseldorf Gustaf-Gründgens-Platz l
Concrete sawing and demolition, PDF - reference letter of the architect regarding our work

Dismantling and disposal of strips of segmental panels containing asbestos from the interior of a cooling tower at Harzheim.

Wire sawing works by means of a circular saw used to form circular cutouts needed for pipe transits with a diameter of 1.80 m in a 30 cm thick reinforced concrete ceiling

Project: Alterations at H & M in Mainz. Some pictures showing the extensive concrete and sawing work including crushing and disposal.

Project: Furniture store POCO at Dorsten, demolition of storage rooms, demolition works were completed, contaminated ground was excavated, filled back with RCL and compacted layer by layer.

The reinforced concrete roof of a church tower located in Bottrop was cut off, dismantled, crushed and disposed of.

Demolition of masonry and concrete in a church. All the window frames over the side wall of a church were dismantled, crushed and disposed of. Combination of drilling, sawing and demolition operations as well as disposal.

on a concrete floor in a factory workshop at Leer. Approx. 20 cm concrete was milled off.

At Brücke near Königswinter asbestos pipes had to be dismantled and professionally disposed of.

Herten, Pankower Straße
Dismantling of 1,500 m² asbestos cement slabs and mineral fibre insulating panels including the substructure and the provision of 850 m² scaffolding and all the disposal work.
Dismantling time: 8 working days

Public utilities Münster -
9 floors of a stair tower built of reinforced concrete and part of the thermal power station, 37.80 m high, with a cross-cut of 5.70 m x 3.50 m and a wall thickness of 30 cm, were sawed off from inside by using a special procedure. Sawing works without using scaffolds, completely from inside, dust-free and free of vibrations.

A new exciting venture for the Senft company in the field of recycling and disposal. We completely dismantled a passenger plane down to its individual components which were supplied to a recycling process in cooperation with a Dutch enterprise.

In Dortmund at Stockumer Straße asbestos removal works were executed on top of a club house, approx. 280 m² asbestos panels were removed in cooperation with our roofer. Due to the weather conditions approx. 150 m² were cleared up and newly covered straight away. Also here again the wrapping of the contaminated material was disposed of in the standardized way.

Wire sawing works in the St. Johannes Hospital in Duisburg. Here foundations with a size of 1.80 m / 1.30 up to 2.20 / 1.80 m were cut by means of wire sawing (in order to avoid noise caused by large scale facilities during stemming operations). The time needed for cutting the approx. 35 m² surface was 2.5 days.

At the Raphael School in Gelsenkirchen several vertical openings were cut in 40 cm thick masonry as well as ceiling openings in 30 cm thick reinforced concrete.

Kamen, Weimarerstraße 14
Here 2,800 - 3,000 m² asbestos slabs incl. the substructure and the artificial mineral fibre materials were dismantled and disposed of. The customer received all services from a single source, e. g. the erection of scaffolds over 3,500 m², the dismantling and disposal etc. The building project was subdivided into 3 construction stages to the effect that the new thermal insulated facade could be mounted again rapidly.

Düsseldorf, Daimler Chrysler Plant
Here a brake test rig was rebuilt. The task set was to saw out and dispose of approx. 92 m² reinforced concrete (230 t) down to a depth of 3.00 m within 4 days. We worked in 3 shifts and thus adhered to the time schedule. After that a surface of approx. 3,500 m² reinforced concrete was dismantled down to a depth of 35 cm and removed. The whole coordination was in our hands.

Public utilities Münster
Concrete drilling works at the Mittelhafen
Cutting out and forming of several wall openings in 40 cm thick reinforced concrete.

Residential complex in Osnabrück
120 balconies with a weight of 5.40 t each were professionally dismantled and disposed of using a merlo resp. a 100-tonne truck crane.
Furthermore 18 reinforced concrete canopies were dismantled, 1,000 linear metres fascia built of precast reinforced concrete units as well as 800 m² asbestos cement slabs were dismantled and also professionally disposed of.

At the Dorint Hotel in Cologne we demolished the swimming pool on the first floor under regular business and disposed thereof. The pool was situated directly above the lobby at the entrance. We had 10 working days to execute this building project. More than 250 t reinforced concrete had to be dismantled and disposed of using a concrete saw..

Core drilling works to the Metro Bridges in Düsseldorf in the course of a redevelopment project, nominal width: 200 mm

Execution of demolition, concrete drilling and sawing works to the bridges of the Metro business group. Special task to be carried out in the outside area. Within one day 4 balconies of 12 m length and 1.40 m width were sawn off and dismantled by means of a 100-tonne crane (up to a height of 17.90 m). In the entrance area the reinforced concrete portal with a weight of 100 t was professionally dismantled (sawed off and dismounted) within one day.

The complete shaft cover with a thickness of 0.67 m was horizontally cut off from a 12 m deep shaft with a 8.80 m Ø by means of a wire saw. The shaft cover was sawn up into 4 parts of 4.6 t each and dismantled using a truck-mounted crane. The wire saw was used because the shaft walls had a thickness of up to 0.90 m. The works were carried out within two days.

Dismantling of balconies in a housing estate - order and cleanliness as well as consideration to the residents are self-evident.

Here an underpass of the DB AG in Essen was cut off over the whole cross-section by means of a wire saw. The width of the masonry was 1.25 m, the concrete slab had a width of 30 cm.

A major order to cut the fitting pieces of cast iron pipes DN 2,000 mm, wall thickness 22.5 mm cast, 9 mm cement lining and external insulation. The pipes had to be cut 100 % straight and at right angles. After that a 45° phase was applied to the cutting edge. Each day 5 pipes were completely processed. 130 fitting pieces were cut. The pipes weighed 13 tonnes each.

Here a door was sawn in a reinforced concrete wall with a 80 cm wall thickness using the wire saw cutting technique.

Here several openings were perforated, drilled out and sawn at a pumping station of the Emschergenossenschaft. The formed opening had a diameter of 170 cm and a depth of 90 cm.

DN: 1200 mm up to 70 cm depth on conduit pipes to be driven in the ground in concrete quality B85, i. e. very hard material.

Demolition of an office building in the city centre of Dortmund. Severe dust formation had to be suppressed using water. Demolition and removal of asbestos tainted floor covering.

Here core holes with a diametre of 600 mm and a drilling depth of 3 m were drilled in the bridge foundations. 14 holes of these dimensions were formed within 5 working days!

Here a 2,000 m² concrete surface was milled off. An asphalt surface with a thickness of 2 cm was removed from the concrete surface, subsequently the milling material was gathered by a sweeping maching and disposed ofg as can be seen in the pictures.

Views of the hall immediately before its demolition

Demolition works in the hall of Daimler-Chrysler executed for the construction of a new brake test rig.

Demolition of 23 former colliery houses.
Use of water in order to suppress formation of dust.

Here a hall inside a hall was dismantled, its size was 15 x 10 m, its height approx. 8 m. The concrete slab was 35 cm thick. The whole hall had to be dismantled vibration-free and had to be disposed of. For these works we needed 5 working days and 4 skilled workers. In the pictures you can see the hall in its original state and during its demolition.

Demolition and disposal (incl. sorting of waste) of a staircase in Bochum, Bergmannsheil Hospital parallel to the ongoing business

Asphalt milling works: here 15,000 m² asphalt supporting layer with a thickness of 16 to 20 cm were milled during one weekend, i. e. within two days.

Here two openings were cut into a concrete slab using an electric joint cutter. Corner holes were formed to avoid overcuts. The dimensions of the openings were 1.55 x 1.55 m with a slab thickness of 25 cm. Including all subsidiary tasks such as disposal and cleaning of the building site the works were carried out within eight working hours.

Here 8 foundations weighing 35 t each were dismantled in front of the listed facade of an office building in Düsseldorf. The coordination was undertaken by us, these giant foundations could be loaded by us only during the night by means of heavy equipment. Several streets in Düsseldorf had to be closed,that is why the removal coulld be effected only during a night shift. The foundations were removed by us using the wire saw technique. We chose this technique because there were very strong reinforcement rods with diameters of 50 mm in the columns. The foundations had served to protect a 20 floor high building while this was being constructed.

Extensive concrete drilling and sawing works as well as concrete demolition works were executed.
A ramp made of reinforced concrete was sawn free at the lateral connections and hydraulically blasted asunder. The size of the ramp was 5.95 x 5.35 m up to a concrete thickness of 0.95 m. It took 3 days to do this and 3 skilled workers were needed to carry out these works incl. the removal of material from the second lower ground floor as well as 20 m³ soil.
The complete reinforcement over a surface of 20 m² and down to a depth of 0.30 m was exposed. Furthermore reinforced concrete and masonry were manually dismantled due to lack of space needed for big construction machinery.

Concrete cutting by means of an electric joint cutter. Here an action was performed which had to be completed within 2 days and 2 nights on a Saturday and a Sunday.
280 m² floor slabs with a thickness of 0.25 m were removed and disposed of. Due to emissions everything had to be sawn out very neatly, 290 linear metres saw cut and also 125 carottages were carried out, additionally 18 m³ reinforced concrete walls located underneath the floor slabs were sawn out and disposed of.

Here we received a new order requiring that we should drill approx. 10,000 core holes in tubbing segments of the tunnel, DN = 35 mm down to a depth of approx. 200 mm. Later on we built in shear force pins which had to be precisely aligned, they would then be used for the suspension of the impact wall which would be concreted on the completion of our works.

In the run-up to this project first of all approx. 15,000 m² corrugated foil were mounted and adjusted to the tubbing wall up to a height of 4.5 m, the foils had to be applied exactly against the tubbing wall.

Moreover concrete sawing works and drilling works were still carried out in the course of the tunnel construction works.

On 19.01.03 the Wesel Tunnel at Dedesdorf near Bremerhaven was opened by Mr Manfred Stolpe, then Federal Minister of Transport. .

Our order was worth approx. 300,000.- €. Approx. 20,000 core holes, dia. = 32 mm, had to be drilled in the tunnel walls for the mounting of impact walls. Subsequently the approx. 20,000 shear force pins were glued into these carottage openings. The tensile testings required were carried out under our direction as well.

Moreover we installed 25,000 m² special corrugated foil on the tubular walls in an elaborate way (to ensure the evacuation of the condensation water along the tunnel walls.)

Dismantling of balconies belonging to houses in a residential estate incl. removal and disposal thereof.

Here a hall with a 13,800 m² floor was restored by us. Individual surfaces between 2,000 and 3,500 m² were milled. Here a 2,000 m² milled surface can be seen where an asphalt covering layer with a thickness of three to four cm was milled off the concrete floor.

Here 1,150 m² reinforced concrete slabs were dismantled up to a height of 7 m and disposed of. Furthermore major drilling and sawing works were carried out.

Approx. 700 m² asphalt covering layer were milled out down to a depth of 20 cm, loaded on a four-axle truck by means of a loading conveyor and taken away. Due to space restrictions we could only use a road milling machine.

1,200 m² Eternit corrugated sheets containing asbestos had to be removed within 2 days. Duration of the works: 2 days, 3 skilled workers on site at Hattingen.

Here the whole ventilation system cladded with asbestos was restructured in a height of up to 10 m acc. to TRGS 519. The remaining dust had to be moisturized and removed using residual fibre bonding agents.

Removal and disposal of 25,000 m² hard asbestos during demolition works.

Break-through in a 32 cm thick reinforced concrete wall, the size of the opening was 6.50 m x 3.50 m x 0.32 m. These works took 2 days incl. the removal of 17.5 t and the disposal thereof. Here it was not possible to use a conventional mortising machine since the adjacent shops and medical pratices were kept in full operation. The works were carried out to the great satisfaction of the client.

An approx. 2.5 m² wide opening in a 20 cm thick reinforced concrete ceiling was formed. To prevent the generation of dust in the inhabited house as far as possible, the preparation of the site was particularly intensive.

Dismantling of a 13 m long canopy by means of a guided wall saw and a lifting device. The saw cut had to be executed flush with the wall. For these works we needed half a working day and the customer was very satisfied.