Application in civil works (constructions high- and deep)

The flexible execution- and concrete-technology of the wet-mixed-shotcrete system allows an economic and exacting solution from a singular individual in civil works of a high level. This system can be used favourable by reconstruction of buildings out of bauxite-concrete. In case of damaging or over-stress from pillars, beam's etc, the wet-mixed-shotcrete can be used as reinforcement or for a complete replacement.

EDV-central, design-office VEGYTERV, Budapest (Hungarian)

By this building, a skeleton of concrete, the concrete-pillars which supporting the monolith cast steel-concrete-slabs are damaged as result of construction faults. The concrete-pillars are not any more in a condition to carry the steel-concrete-slabs and the hole concrete-skeleton of the building come in danger. For disengage the damaged pillars an urgent decision had to be reached. For the damaged pillars, a spraying of load-carrying concrete-shell with appropriate reinforcement was one of the solution. The pillars became an outer reinforcement and the concrete-shell had to be sprayed on top of the reinforcement, so that the load carrying of the pillar restored to the original conditions.

Office-building, Ròbert-Kàroly-Ring, Budapest (Hungarian)

The manufactured load-carrying elements, out from bauxite-concrete, of this Office- building shows intensity weakness (ancient), so that an urgent reinforcement during the reconstruction of the building was essential. The corrode and from cracks attacked surface of the pillar, ceiling-support and other load-carrying elements had to be removed. The elements became outer steel-armouring and corresponding to the strain stress a concrete-shell has been sprayed on top of the armouring. A sufficient safety-factor was considered. According to this technology, the building has been reconstructed and strengthening without essential demolition. This treatment is used successfully also in underground work, for example in tunnel, basement-construction and other objects underground. This application is similar to the mining work.

Eger (Hungarian)

Nearby an entrance-section of a basement-construction in the Kisvölgy street, a high-way was constructed. Because of the expected dynamic load-stress through the heavy road-traffic, it was necessary to strengthening the entrance-section. The cross-section, which has changed among 4 and 10m², steel-mats according to the HILTI - system placed in. On top of the steel-mats a 15cm thick concrete-layer, quality B 280 with Andesit-gravel has been sprayed. The constructed section of a length from 46 m became six crossings.

Pécs (Hungarian)

A corrodes brick-wall of a basement-construction, in the city of Oécs, Láncs-street, has been reconstructed by the wet-mixed-shotcrete system. First of all, the weather-beaten face of the brick-layer has been taken away and a steel-mat of 15 x 15cm grid-distance and rods 8mm diameter, has been installed. On top of the steel-mats a 15cm thick concrete-layer, quality B280 with gravel was sprayed on. This works carried out of a length of 64 m with two basement-crossings. The cross-section of the basement is 12m².

Szólnok (Hungarian)

In the basement of a culture-building, steel-mats according to the HILTI - system placed in and a water-tight concrete-shell, 10 cm tick, sprayed on top of the mats.

Vidraér, Koitat Caográd (Hungarian)

The tightening of a water-structure-object, a tunnel, which cross the river-bet of the river Tiza underneath, was the subject. The inside of the tunnel became steel-mats, out of 6mm wire, according to the HILTI - system with a sprayed concrete-layer of 10cm thickness.

Railway bridge, Vasas (Hungarian)

On the concrete-end-pillars with steel-structure, cracks became visible. After the removal of the damaged parts and with a corresponding preparation, the pillar becomes reinforced by a calculated armouring and sprayed with concrete. The method allows the construction- and rehabilitation-works without restriction of the traffic.

Pécs - Vasas, subway for the a railway-line underneath a traffic-road (Hungarian)

By a renovation of a tunnel, with an origin brick-wall that has here and there strong corroded, the wall became two layers of steel-mats and a sprayed-concrete layer on top, so that this layer can carrying the stress.

Railway - subway by Nagysimony (Hungarian)

By the reconstruction of the tunnel an already dissolved brick-wall, gets in a corresponding distance, tow layers of structure steel elements and a sprayed-concrete wall with necessary thickens.

Railway - subway by Northampton (England)

With support of the wet-mixed-shotcrete-system the corrode brickwork of the rail-subway nearby Northampton becomes reinforced.

Bridge in Birmingham (England)

With support of the wet-mixed-shotcrete-system the rehabilitation of the bridge in Birmingham gets through.

Reconstruction of a brick-stone-work by Sawley (England)

A subway of brick-stone-work, from the turn of the century, of British Rail for the Trent Weston Line - nearby Northampton and Nottingham - becomes reinforced. British Rail (England) obtains the licence for the wet-mixed-shotcrete-system and has, up to day, more then 73 objects reconstructed.

Hasenbuck-tunnel, Nürnberg (Germany)

During construction of the underground railway in Nürnberg, a mountain ridge, the so-called „Hasenbuck“, of a length of 480m must drove through. In the blast-heading method the tunnel-works has been executed, bat in zone where the surface-covering was only 3 to 5m the milling-cutter used. The protection of the heading carried out by a spared-concrete-layer. By the following extension work, the so called sandwich-construction refined.

The courses are as follows:

Section of the tunnel passed a layer of ground-water, therefore a sealing between the sandwich-construction and the interior work had to be installed. Following the course of the sealing-work:

Three periods of work are essential:
One undercoat with pure „Prenotekt“ without electrolyte-solution and two times with „Prenotekt“ together with a electrolyte-solution.

In order to prevent damages on the interior-work, a mortar-protection-layer, about two cm thick, which have a good stickiness at the sealing, had to be sprayed on. By the following interior-work the vaulted roofs are manufactured from steel-concrete whose densities are by 15 and 30cm is. The complete carrying inside-vaulted roof are prepared by the wet-mixed-shotcrete-system. Through this way of the immediate protection of the tunnel-outbreak, the application of the wet-mixed-shotcrete-system finds large expansion.

Pressure-stress of wet-mixed-shotcrete through STUVA confirmed

In 1980 the wet-mixed-shotcrete-system in thin stream technology of SPERNO passed the test of the concrete-pressure-load, under addition of liquid BE, through STUVA successfully. The test carried out shows clearly, that with the used sprayed-concrete-machine and dosage-equipment, the wet-mixed-shotcrete-system in thin stream technology of SPERNO can be used for traffic-tunnel-construction in urban areas.