ZEMİNTAŞ Construction Trade Ltd. Company






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Company Profile

Zemintaş İnşaat Sanayi ve Tic. Ltd. Şti.

The company, engaged in ground and foundation engineering, is one of the most specialized enterprises of the sector.

Zemintaş has adopted as a principle to create logical projects under the rules of engineering and further to implement them along the utmost level of service approach with strict commitment to the technical norms. In this context, the company has taken a major role both as a project designer and implementer in ground survey, ground improvement, foundation pile and deep excavation support works under the foundation engineering design of myriad of projects such as highway, bridge, airport, factory, business centre and flat constructions since 2000, the year of foundation.

Zemintaş’s power and influence owes to knowledge accumulation and its state-of-the-art machinery park as well its excellence in the perfect completion of any job started so far. Parading with robust steps into the future thanks to the confidence it has and investments it has implemented, our company has targeted to be an “arbiter” in the international arena as well.

GROUND AND FOUNDATION ENGINEERING PRACTICES

Bored Piles, Driven Piles, Mini Piles, Jet Grouting, Injection, Stone Columns, Wick Drains, Dynamic Compaction

BORED PILES
Bored Piles are cast-in-place piles. They may be constructed in various diameters (65-80-100-120-150cm) and sizes (0-45m). The appropriate drill for the project is rotary-opened by means of a hydraulic driller. After the drill is finished, reinforcement and concrete is fit into the pit and the construction is completed. During drills in non-cohesive grounds, a steel casing pipe is driven into the ground. The casing pipe is retracted after concreting is completed.

Deep bored foundation piles are commonly employed during the construction of buildings expected to have different seating due to the static system they have or the fact that ground layers with reliable bearing capacity are in the deep. Furthermore, bored piles are also constructed when rigid vertical components are required in slope stability solutions and constructing deep excavation support structures.

DRIVEN PILES
In the pile-driving process, reinforced-concrete piles constructed in pre-cast form, steel pipes and profiles are driven into the ground by means of diesel hammers. During pile drive, a gradient suiting the project is provided by means of the guide rails of the crane.

Similarly, vibrex piles are constructed by means of driving a steel pipe with one side capped into the ground and fitting concrete through dropping reinforcement inside.

In this method, steel pipe is retracted from the ground with a vibro hammer. Driven piles are also constructed for consolidation purposes as they provide compaction in non-cohesive grounds.

MINI PILES
In the mini pile method, a drill in a diameter of 15-35cm is opened and reinforcement and concrete is fit into the pit. Drills are opened by means of drill guns for tough formations, and by means of continual twisting for mild and soft formations. Concreting of mini piles is implemented by way of filling clean aggregate into the pit in grounds where underground water is influential and then jetting cement grout upwards from the pit base.

Mini piles are commonly preferred as an underpinning system for foundations of lightweight buildings. Furthermore, mini piles are sometimes implemented both in basements and outdoors during underpinning of old buildings. In these practices, mini piles are designed in single or networked form.

Most common practices utilize mini piles as a vertical component in soldier pile systems. Systems employing mini piles offer economical project advantages depending on the parameters of the application ground. For this reason, systems with mini piles are highly preferred in deep foundation and soldier pile constructions.

JET GROUTING
The jet grout column is obtained by the fill and squeeze of ground holes by the mixture of water and cement jetted at a pressure of 400-500 bars. High pressure gives a very high kinetic energy to the injection passing through the nozzle. The velocity of the water-cement mixture reaches 250 m/sec thereby tears and mixes with the ground to form the soilcrete.

Jet Grouting is a reliable underpinning system that may be applied to ground layers lack of bearing capacity, non-uniform lands and building seats under which the ground shows great variations.

Furthermore, Jet Group practice is sometimes implemented for impermeability purposes in soldier pile systems constructed on grounds hosting intensive ground waters.

INJECTION
Injection process is implemented through holes drilled by various methods on the rock and ground. Core or none-core drills are performed by means of the rotary drilling method. After the pits drilled are rinsed, pressurized injection is poured to the pit. Injection is the process of penetrating under high pressure cement, bentonite or various organic and inorganic chemicals into the cracks of rocks or ground holes.

Injection is applied beneath building foundations for ground improvement. In major engineering constructions such as dams and tunnels, injection practices are implemented by means of Hole, Consolidation and Impermeable Sheet methods. Graduated Injection methods are applied where impermeability is a major issue.

DEEP EXCAVATION AND SOLDER PILE PRACTICES

Soldier Pile System with Bored Piles and Anchorages
Soldier Pile System with Mini Piles and Anchorages
Soldier Pile System with Reinforced Concrete Sheets and Anchorages
Soldier Pile System with Shotcrete and Ground Studs
Soldier Pile Systems with Diaphragm Walls and Anchorages

SOLDIER PILE SYSTEM WITH BORED PILES AND ANCHORAGES
Deep excavations appear as major engineering constructions in today’s urban development approach. Soldier Pile Systems are constructed to keep the ground in stability during the construction of tall buildings and vital buildings such as undergrounds and tunnels. Model design of the soldier pile system is dependent on factors such as excavation depth, ground type, state of ground waters, and burdens of external agents such as buildings, roads etc.

Rigid vertical components are selected in very deep excavations made or soldier pile systems constructed in instable grounds. Such vertical components are bored piles of 65-80-100cm in diameter employed in intermittent, tangent and cross modulations depending on the project.

Soldier pile systems with bored piles may be designed in console form or as a vital component in the construction of very deep safe excavations when applied with pre-tensioned anchorages.

SOLDIER PILE SYSTEM WITH MINI PILES AND ANCHORAGES
Soil pressures that may form in deep excavations are balanced with different soldier pile systems. Creating solutions by employing systems that are safer more than needed are not cost effective. Therefore, economical and safe solutions should be developed. Components of the soldier pile system are sized according to the soil pressures having impact on the system.

In mildly deep excavations, soldier pile systems with mini piles of 25-30cm and pretensioned anchorages offer cost-effective and safe solutions. Soldier pile systems where mini piles and pretensioned anchorages are utilized together are successfully implemented in deep urban excavations.

SOLDIER PILE SYSTEM WITH REINFORCED CONCRETE SHEETS AND ANCHORAGES
Deep excavations are indispensable construction structures of modern town development. High costs of the construction lands and desire to utilize the excavation area to the fullest extent drift investors towards opening deeper excavations. Soldier pile systems have been developed to balance the soil pressure that may form in these deep excavations.

In systems where bored piles or mini piles are employed as vertical components, the whole soldier pile surface is coated with a reinforced concrete sheet, and then pretensioned anchorages are applied through the sheet.

SOLDIER PILE SYSTEM WITH SHOTCRETE
Soldier pile systems with shotcrete are designed to develop cost-effective and rapid solutions in deep excavation practices. The soil pressure that may form in these systems is balanced with ground studs serving as passive anchorages. In such systems that may be applied in cohesive and tough formations, the contact between the ground and air is cut upon the jet of the shotcrete. The jet concrete is prepared with granulometric material with a humidity rate of max. 5% and then applied to the surface coated with steel mat with a setting accelerator additive. Ground studs then constructed over the coated surface are designed in permanent or temporary form according to the desire.

Soldier pile systems with jet concrete and ground studs are frequently employed in mildly-deep temporary urban excavations. Furthermore, permanent soldier pile practices are preferred to solve slope stability-related problems in highways. Also the safety of shaft and tunnel excavations during underground works is secured by this system.

SOLDIER PILE SYSTEMS WITH DIAPHRAGM WALLS AND ANCHORAGES
Soldier pile system with diaphragm walls is a process employed in non-cohesive, smooth grounds with high excavation depth and influential ground water. This process is designed as a console sheet or an anchored mechanism in deep foundation excavations or in major “drill & close up” excavations like in underground stations. Furthermore, there are also diaphragm walls designed in the form of impermeable sheets for the insulation or control of ground waters. In diaphragm walls constructed to provide impermeable sheets, plastic concrete without reinforcement is employed. In the construction of diaphragm walls, panel-type excavations are performed by means of mechanical and hydraulic buckets. A bentonite solution is employed to advance the excavation. After excavation at appropriate depth suiting the project, the reinforcement is dropped followed by concreting.

SURVEY AND SUPERVISION PRACTICES
Ground Survey Drills
Pile Loading Tests
Instrumental Observations
Project and Consultancy Services

PILE LOADING TESTS
Pile loading tests are performed to identify the solidity and conformity of the pile constructed. In major projects, these tests are the observations revealing the resistance-deformation characteristics of piles within the range preliminarily specified according to the project. In bored pile and jet grout practices, additional observations such as pile continuity tests are performed.

Arbiter in Ground Applications

QUALITY SYSTEM
Our applications are performed under the supervision of the ISO 9001:2000 Quality Management System.