Pipe ramming technology using a pneumatic rammer


Passing under roads, railways, engineering facilities, canals and others, passing along closely located existing underground communications. Later on, work pipes, cables etc. are installed in the casing pipes.

The technology allows installation of steel pipes with diameters up to 4000mm and lengths up to 80m in various soils and at certain conditions even in decayed rocks. The technology is particularly suitable in unstable, loose soils, presence of boulders, gravels, as it completely eliminates the danger of collapse which is critically important in case of highways and railways crossing.  

Pipes can be rammed parallel to each other, by using suitable guiding profiles. Thus a bundle of casing pipes can be installed, aiming at enlarging the total passage section. Another option is ramming of pipes in the shape of semicircular arch. After removing the soil from inside of the pipes, they are reinforced and grouted. The soil under the arch is removed and a tunnel of large width is formed.


Technology advantages

The technology allows installation of casing pipes with a very small covering and at a guaranteed lack of collapses of the terrain or the road covering.

The installation time is very short – in certain conditions only a few hours.

Minimum mechanization is needed, due to which the preparation time is very short.


Suitable pipes

Steel pipes


Technological process   


The casing pipe is laid in the preliminary made start shaft (the length is about 2m larger than the length of the pipe, provided for ramming). It is directed and leveled and after that the pneumatic hammer is attached to its rear end. Compressed air is fed by a standard air compressor to the hammer and it starts pipe ramming. As the front end of the pipe reaches the end shaft, the hammer is demounted and the soil is removed from the inside of the pipe. In case the job site conditions do not allow the whole pipe to be rammed at once, it is rammed by sections of suitable length that are consecutively welded one to another.

Due to its specifics (dynamic percussion action), the technology allows crushing of obstacles and easier overcoming the soil resistance.

The precision in reaching the set direction and inclination is high, as the dynamic ramming successfully overcomes various soil formations in the pipe diameter area and crushes, but not removes the obstacles, neither pushes them ahead.


Significant projects