The best way to restore concrete slab road surfaces is to use the geopolymer injection method Slab Lifting. It allows to raise settled concrete slabs, and to level the surface of the entire section of a road or car park. The Slab Lifting method also allows to repair inoperable sections of roads adjacent to bridges, railways, port docks, loading platforms, etc.
Riga authorities decided that during renovation of the tramway tracks the heating system pipeline that was running under the tracks had to be replaced as well. As location of the pipeline changed after construction of the technical line, it was decided that the pipeline was to be installed by way of boring.
Riga authorities decided that during renovation of the tramway tracks the heating system pipeline that was running under the tracks had to be replaced as well. As location of the pipeline changed after construction of the technical line, it was decided that the pipeline was to be installed by way of boring. Unfortunately, boring operations resulted in decreased density and settlement of the ground, which in turn led to uneven settlement of slabs under the tracks. After long discussions Riga authorities and engineers decided to use services of URETEK in order to resolve the problem without disturbing the tram traffic.
URETEK’s team performed the works at night, when the trams were not operating. First and foremost the settled area was identified, following which cavities in the ground were filled by injections of geopolymer resin.
When the ground surface was stabilised and its loadbearing capacity restored, the slabs and tracks were again raised to their initial height. The entire work process took 4 hours, and this method was the most efficient way to solve the given problem.
URETEK developed a solution where the openings in the piling walls were closed, the voids were filled, and the initial load-bearing capacity of the soil was restored.
A new reception berth for cruise ships was built in the framework of the extension works of the West Terminal of the Port of Helsinki. Already during the first tests it was recognised that there are openings between the underwater piling walls and due to the movement of water from screw propellers of ships, the filling of the berth is washed away to the sea and the concrete slabs of the berth started to sink. The survey identified extensive voids inside the berth due to the washing away of the filling soil. The engineers who consulted the construction works of the West Terminal contacted the team of URETEK to assess the possibility of cooperation. Since the given project required the involvement of specialists of different fields, URETEK was interested in this project since the very beginning. Divers had to be called in to perform the underwater survey and carry out the inspections during the works. Additionally, Finnish earth drillers had to be summoned for an extremely difficult and precise drilling works. It requires a long and well-elaborated cooperation to shape the work of all the involved parties into the perfect outcome.
Eventually, URETEK developed a solution where the openings in the piling walls were closed, the voids were filled, and the initial load-bearing capacity of the soil was restored.
The use of URETEK ’s technology helped to avoid time-consuming traditional construction works and allowed to complete the works well before the initially planned deadline.
In the course of extension works in Port of Nasva, a sheet piling was rammed in the sea, which remained unbound in one corner and east wind emptied the area behind the sheet piling. Seawater had eroded the filling material under the berth to the depth of 6 m, thus endangering the superstructure of the new berth.
In the course of extension works in Port of Nasva, a sheet piling was rammed in the sea, which remained unbound in one corner and east wind emptied the area behind the sheet piling. Seawater had eroded the filling material under the berth to the depth of 6 m, thus endangering the superstructure of the new berth. Therefore, it was necessary to compact the area behind sheet piling again, stabilise the soil and fix sheet piling.
URETEK team was tasked with filling the voids in the soil under the berth, closing the underwater part of berth to ensure stability of embankment, and stabilising the soil under the berth at the depth of up to 6 m. Works were performed within six hours, during which loose soil was compacted, voids filled and underwater sheet piling waterproofed.
An alternative to URETEK technology would have been concrete works, but as it is impossible to weld under water, there was no way to fix the sheet piling.
Recently built four-lane road showed signs of subsidence and voids under the pavement, which caused closing two lanes for traffic. Despite repeated attempts to solve the problem by using traditional excavation method, subsidence was not stopped.
Recently built four-lane road showed signs of subsidence and voids under the pavement, which caused closing two lanes for traffic. Despite repeated attempts to solve the problem by using traditional excavation method, subsidence was not stopped.
URETEK technology was used to fill voids and prevent sand filling from entering between large-fraction crushed stone in the future. Works lasted for six hours and after asphalting, the road was open to traffic again.
Although the pavement was removed before performing injection, it would not have been necessary when using URETEK technology and in this case, it was done to find out the reason for subsidence for the purposes of expert assessment.
Pipeline was installed under a busy road in Tallinn, but the soil surrounding it was not sufficiently compacted, which caused subsidence of road surface. Subsidence has reached the point where it started to disturb traffic and after two to three attempts to fix it, the client contacted URETEK team.
Pipeline was installed under a busy road in Tallinn, but the soil surrounding it was not sufficiently compacted, which caused subsidence of road surface. Subsidence has reached the point where it started to disturb traffic and after two to three attempts to fix it, the client contacted URETEK team.
Filling voids by using traditional excavation method would have caused stopping traffic for four days. Considering that it is a busy street, such a solution would have been extremely disturbing for road users. By using URETEK method, this problem was solved by closing one lane for just four hours.
In the course of this task, special geopolymer was injected directly in problem area and filled voids. After filling voids, the client replaced topmost soil layer with asphalt and street was reopened for traffic.
A subsidence occurred in recently completed road section in Jüri small town for unknown reasons, causing asphalt to collapse in 1.5 m radius. In the event of using traditional method, entire subsidence area would have been excavated and soil newly compacted. That would have taken at least two days and involved exploitation of heavy-duty machinery.
A subsidence occurred in recently completed road section in Jüri small town for unknown reasons, causing asphalt to collapse in 1.5 m radius. In the event of using traditional method, entire subsidence area would have been excavated and soil newly compacted. That would have taken at least two days and involved exploitation of heavy-duty machinery.
Client decided to use URETEK technology. Subsidence was filled with sand; concrete blocks were placed on top of the subsidence to achieve maximum soil compaction; and geopolymer was injected into the soil.
Gonsiori Street is one of the main arteries in Tallinn, closing of which would inevitably cause major congestions during rush hours. Unfortunately, in the course of reconstruction works carried out in Gonsiori street, there occurred subsidence under massive heating pipeline.
Gonsiori Street is one of the main arteries in Tallinn, closing of which would inevitably cause major congestions during rush hours. Unfortunately, in the course of reconstruction works carried out in Gonsiori street, there occurred subsidence under massive heating pipeline.
As the base of the road had already been completed, the client asked URETEK team to help with stabilisation of subsoil for heating pipeline. Traditional method would have involved cutting out the heating pipeline, compacting the soil and reinstalling heating system. However, that would have meant postponing the completion of works and closing roads for remarkably longer period. Client excluded that option immediately.
Geodesic specialist present at the site provided URETEK specialists with accurate data regarding the location of subsidence and URETEK team stabilised the soil and restored its load-bearing capacity. Works lasted for 2—3 hours.