Jetgrout/Jet Grouting - Jet technology Jet-I and Jet-piles

Technology JET grouting consists in use of kinetic energy of a stream of the cement slurry directed on destruction and hashing of a ground in soil. These cemented formations of soil called soilcrete.

At use of jet technology for strengthening of weak priming coats building passes faster and is more low-cost.

We apply at building in the constrained conditions the small-sized, highly mobile support equipment, allowing to carry out piles on one-jet technology JET-1 in which water and cement are used and as a result piles in diameter to 0,8 m. are made.

JET-piles also at are hastily applied for groundwater or pollution control, on durability comparable to the concrete, excluding penetration into a water foundation ditch.

SHEET PILE WALLS - retaining systems for deep excavations

Sheet Pile Walls - Basements

Sheet Pile Walls - Underground car parks

Chemical Grouting is one of fastest and most effecient ways of stabilizing poor soils!

Strengthen existing soils without the need for excavation or disruption of facility operations!

In this extremely specialized field, grouts are used to fill voids and create sub-grade grout barriers in earthen dams, coastal seawalls, underground vaults and tunnel boring operations.

A major advantage of chemical grouting is the ability to strengthen existing soils without the need for excavation or disruption of facility operations.

Screw injection piles: vibration free, displacement pile

The screw injection pile is, basically, a steel tube pile encased in hardened cement grout. During installation the ground is wholly displaced, thereby increasing the bearing capacity. The steel tube is installed by screwing, whilst simultaneously injecting cement grout. During the installation the grout acts as a lubricant, which temporarily reduces driving resistance. When set the cement grout increases the strength and stiffnes of the pile, transfers part of the loading to the ground and gives corrosion protection to the steel tube. The steel tube is filled with either cement grout or concrete.

Types of Retaining Walls

Retaining walls can be divided into cantilever or supported types.

Cantilever walls are dependent solely upon penetration into the soil for their support and clearly fixity of the toe is required to achieve equilibrium of the forces acting on the structure. As fixity of the wall toe requires longer and, in many cases, heavier piles to achieve the necessary penetration into the soil, this type of wall can only be economic for relatively low retained heights. It is also likely that deformations will be large for a cantilever solution.

Variations in soil properties, retained height and water conditions along a wall can have significant effects on the alignment of a cantilever wall and care must be taken when designing them for permanent structures, although provision of a capping beam will often alleviate alignment problems.

Trench shoring systems and trench protection systems

The best possible trench protective solutions are critical to the success of underground construction projects and offer contractors a competitive edge they cannot afford to overlook.

The path to this objective is easy to follow and makes greater sense than ever before. New technologies have expanded choices for excavation support systems and added a financial incentive for using them. Unlike conventional trench protective methods that can add time and cost, these state-of-the-art technologies are designed to drive productivity and efficiency. Thus, the selection and proper use of optimal trench safety systems has become not only the right thing to do but also the financially sound thing to do.

Foundations are determined by ground conditions.

Raft foundation is required on soils of low-bearing capacity or when heavy column loads cause overlapping of the pads. Raft foundation is useful in reducing differential settlement, especially when the soil nature varies over the area where the building is constructed.

Under raft foundations a reinforced concrete raft is designed by an engineer to “float’ over bad or differentially settling ground. Deep strip type foundation has a minimum 225mm of concrete, sometimes with reinforcement, at the bottom of the trench if the engineer considers it to be necessary.

Concrete-filled steel pipe piles are applied to the building of the bases and fencings. They represent piles with the metal tubings core, immersed by pneumomandrel plugs. A steel pipe pile arrange with links in length on 0,5-1,5 m (depending on conditions of production of works) which are joined to the help of electric welding. Concrete-filled steel pipe bearers can be carried out with reinforcing and without reinforcing of a concrete trunk. Steel pipe piles concreting similarly to boring-stuffed piles.

Methods of immersing of pipes at the building concrete-filled steel pipe piles:

• driving down (pneumomandrel plugs)
• cave-in

The slot-hole bases represent poles and tapes under columns and walls of buildings and the constructions, arranged in the way "a wall in a ground".

Unlike traditional application of a way "a wall in a ground" mainly for deep non-load-bearing constructions, the slot-hole bases concern the load-carrying structures, capable to perceive all sorts of loadings from elevated parts of buildings and constructions, without excluding and combination of functions of bearing and non-load-bearing designs.

In coherent is strong-structural not waterlogged priming coats the slot-hole bases with depth to 6 - 8 m probably to arrange without application of an argillous solution. It allows to lower essentially a base bid and to simplify a production technique of works.

Ground consolidation by a rubble piles

The method is applied since 1990, protected by the patent ¹2026926 from 20.01.95

The method is successfully used in clayey grounds semifirm and hardly a semifluid consistency, in sandypriming coats, dry and there are not enough damp.

Consolidation of priming coats of the base is carried out by a rubble or concrete ramming in the slope driven wells passed by a pneumomandrel plug under a sole of the bases.

After consolidation in 2-2,5 times resistance of a ground increases and at 5-10 times amplitudes of vacillatings of the bases from movement of motor transport and underground trains decrease.