Canal and Large Pipes

The in-situ ground builds the most optimal pipe support during pipe driving, since the pipe in its entire cross-section rests ideally in the earth and the in-situ ground is not disturbed. This is the basic idea for the patented pipe installing procedure of UHRIG. The large pipe is laid in a pipe bed, precisely contoured with the adapted pipe outer diameter. The Pipe Support The contouring of the in-situ construction ground ranges to the height of the half-pipe; thus, the expensive gusset-backfill work on the underside of the pipe can be omitted. By utilising of the most modern excavator technology and excavator accessory equipment, the UHRIG pipe laying procedure is done completely unmanned, the obstructed trench does not even have to be entered. The Construction Trench During conventional open pipe driving, the trenches are left open in their entire length of a piping segment through the long-lasting backfill work. With the UHRIG pipe laying procedure, the newly laid large pipe is filled in again, if necessary with prepared material (see for this, ground preparation according to the UHRIG procedure). Through this patented pipe laying procedure, the construction trench as well as the entire construction site is very small regarding needed space. This makes possible, even with very cramped spaces, very efficient driving.

Civil Engineering

Since infrastructures in canal construction are becoming more and more complex, constructive engineering has become indispensable. Since one mostly builds onto the existing construction in canal construction or has to manufacture very large constructions, this can often no longer be realised in pre-fabricated building construction. Everything from a Single Source, from One Hand Since it is our claim to deliver everything from one source, we have crews who exclusively work in local concrete construction and are led by qualified foremen.

Conduit Tunnels

Conventionally, conduit tunnels are manufactured in complex, rectangular cast-in-place concrete building methods or from semi prefabricated parts. These have, however, a enormous need of space at the construction site facility. Disadvantageous are also the long, open trenches, which additionally have to be supporting using sheeting construction, often very expensively. Rationality through Prefabricated Parts In addition, during conventional working methods, an enormous amount of work arises, which comes from the duration of the prescribed final form work. Thereby, with respect to the conduit distribution inside the tunnel, the flexibility of the rectangular profile is very limited. Mostly the size of the conduit tunnel is selected according to the largest supply diameter that has to be installed, although very much smaller required space would be enough for the smaller diameters. The UHRIG system provides an efficient and cost-effective remedy, in view of the large amount of disadvantages. The UHRIG System By utilising prefabricated parts in the form of concrete large pipes, a laying of rectangular prefabricated parts is also possible in the same procedure. In this way, one achieves civil works that need much less time to complete and thus are significantly more economical. The required space for the construction trench amounts to not more than 6.5 m, since the laid pipe is immediately filled up again using the UHRIG system. For more, see: Laying of large pipes. Since conduit tunnels are mostly built in streets with heavy traffic or very cramped spaces, it is very important that such civil works are executed as quickly as possible and using the smallest required space possible. Further advantages as compared to the rectangular profiles lie in the more flexible arrangement of the supply conduits within the conduit tunnel. The hanging of the conduits occurs via a carrying rails, which are set in the concrete, which very easily enable an additional attachment of conduits. In addition one can leave a recess free for the additional conduits in the integral floor pavement to allow good accessibility. Conduit exit construction parts as well as emergency exits are realised in the UHRIG system by means of prefabricated parts, which leads to a further acceleration of construction progress.

Ground and Surface Foundation

Ground Improvement with Concrete-bound Stabilisation Columns CSV Although it has already successfully been used on numerous construction sites, a new alternative to the time and cost intensive underground replacement is the installation of lime columns with minimal diameter. The CSV procedure, in terms of the technique to execute it, is a very flexible surface foundation procedure, by which stabilisation columns are brought into ground of inadequate load-carrying capacity using a complete displacement procedure. Procedure Principle For the procedure, complete displacement columns are manufactured using a worm and a special press head. The CSV worm passes through a storage tank. When pressed into the ground, as also when pulling, the worm conveys an aggregate mixture from the tank and compresses the dry mixture to form solid columns. Mode of Operation of CSV Columns The aggregate mixture introduced removes water from the ground and thereby hardens. The ground improvement refers as well to the improvement of the in-situ ground through drainage, as also to the effect of the columns, comparatively stiff, in connection with the neighbouring ground. Due to the greater stiffness of the stabilising columns as compared to the ground firmness, the load is concentrated on the stabilising columns. Through this, the ground is not so heavily loaded between the columns (load transferral)Zahl

Lowerable Manholes

In order to reduce costs for expensive vertical sheeting work and water drainage during manhole construction, the sinking of lowerable manholes is a very economical alternative to local concrete construction or pre-fabricated parts. The manhole is set on the ground and slides, during removal of the core earth in the construction site, evenly via its own weight into the building ground. Manhole Bottom As a rule, several manhole parts are set upon each other, in order to reach a greater depth. For this, after the depth of the site as been reached, the manhole bottom is made in the required thickness, in ground water with underwater concrete, otherwise with conventional concrete. After the concrete hardens, the manhole is pumped out. If pressurised or pre-loaded ground water is present, additional sealing measures between the manhole bottom and the underside of the manhole must be taken

Sheeting Systems

To solve the problems of our canal projects, we have developed and built the most varying vertical sheeting systems. A special attention lay here on the absolute strength coherence in the inner-city area. With these systems we are able to lay pipes with diameters of up to 3.5 metres and depths of up to 10 metres. Thanks to the many years of experience in underground engineering, we know about the special characteristics of the ground and about how excavation pits and trenches are secured. For assembly-friendly and safe solutions for the different canal construction projects, we have developed our own, diverse sheeting systems. UHRIG machine engineering constructs and produce them partially in house for upcoming construction projects and for economical operation.