»Efficient system for shorter crossings up to +-40 m for pipes with the smallest to the largest diameter.«
The rapid development of civil engineering and the ever-growing demand for modernisation of transport surfaces and environmental regulation resulted in new circumstances and problems in replacing outdated municipal infrastructure.
During newbuild, reconstruction or rehabilitation of pipelines, we mostly encounter difficult crossings of existing roads, waterways, railways etc. After excavating trenches in asphalt surfaces, it is practically impossible to restore the asphalt to the original state.
Although we largely manage to achieve solidity of trenches comparable to the existing pavement, hollows or bumps sometimes appear at the crossing point. Our roads therefore have a number of impact pits and aesthetically distracting damage.
To avoid such difficulties, we approached this problem in the area of subsurface drilling of asphalt roads both professionally and technologically. The results are clear, and today we have access to technology allowing us to produce bores of diameter f 40 mm to f 2000 mm.
This technology enables us to cross asphalt roads, railways, waterways etc. Work takes place using the system of ramming protective metal pipes. We found the following strengths and weaknesses compared to other boring technologies in the production of subsurface drilling:
Suitability:
The technology is suitable for implementation of crossings in construction of gas pipelines, water pipes, sewers, telecommunications …
Diameters
Subsurface drilling may be implemented in diameters from f 114 mm to f 2000 mm.
Length
The technology enables bores up to 50 m in length.
- Production of subsurface drilling requires a relatively small construction pit.
- The technology does not excavate or remove material underneath the pavement, and so settlement or extrusion is impossible. The material that theoretically occupies the future borehole is laid in pipes and so we install the pipes under the road.
- Bore lengths are relatively high, up to 50 m, depending on the terrain and the difficulty of the soil.
- Bores can be implemented in very difficult circumstances, where implementation of a construction pit is very difficult or impossible.
- Implementation of bores in all category II, III and IV terrains (earth, gravel and rubble, silt, gravel, clay …).
- Satisfactory accuracy of implementation.
- Environmentally acceptable technology (drive medium is air).
- Implementation of bores is possible at minimal depth due to non-removal and non-displacement of material under the pavement.
- Possibility of implementing multiple bores in parallel without horizontal or vertical shifts.
- Implementation of bores not possible without protective metal pipes.
- In certain cases, the required accuracy of levelling of bores cannot be achieved.
| No. | Implementation of bores | Protective metal pipe |
| 1. | fi 125 mm | Fe fi 125 mm x 4,5 mm |
| 2. | fi 159 mm | Fe fi 159 mm x 4,5 mm |
| 3. | fi 219 mm | Fe fi 219 mm x 6,3 mm |
| 4. | fi 273 mm | Fe fi 273 mm x 7,1 mm |
| 5. | fi 323,9 mm | Fe fi 323,9 mm x 8 mm |
| 6. | fi 406,4 mm | Fe fi 406,4 mm x 8 mm |
| 7. | fi 508 mm | Fe fi 508 mm x 8 mm |
| 8. | fi 610 mm | Fe fi 610 mm x 8,8 mm |
| 9. | fi 711 mm | Fe fi 711 mm x 9 mm |
| 10. | fi 813 mm | Fe fi 813 mm x 10 mm |
| 11. | fi 1016 mm | Fe fi 1016 mm x 12 mm |
| 12. | fi 1220 mm | Fe fi 1220 mm x 12 mm |
| 13. | fi 1420 mm | Fe fi 1420 mm x 12,5 mm |
| 14. | fi 1620 mm | Fe fi 1620 mm x 12 mm |
| 15. | fi 1820 mm | Fe fi 1820 mm x 12,5 mm |
| 16. | fi 2020 mm | Fe fi 2020 mm x 14 mm |
The generally accepted view of this technology is that boring is in principle sufficiently accurate and cost-effective, while production requires disproportionately small construction pits. Implementation is possible in very difficult terrains and conditions.
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