Replacement of water disposal networks  

The technology allows a trenchless method of replacing cast iron, ceramic, asbestos cement, concrete and reinforced concrete pipelines along the existing route. Equipment sets of nine standard sizes have been designed to replace pipelines with diameters from 100 to 600 mm. This technology allows replacing emergency pipelines with polyethylene pipelines with an increase in diameter by a factor of 1.5-2 times.  

Principle of operation:

On the pneumatic hammer, located in the working pit, a ribbed expander is mounted, to the rear of which the sections of the new pipeline are connected. Cable winch with an anchor device located in the receiving well, passes through the replaced pipeline section and joins the front of the impactor. When the pneumatic hammer operates, the blow is transmitted to the expander, and through it to the old pipe. There is a destruction of the old pipe and expansion of the soil to the outer diameter of the expander. In the resulting well, when the pneumatic hammer moves, a new pipeline is tightened, which is extended by sections in the working well with the help of pipe spanners. Depending on the nature of the pipeline operation, the pulling method can be used. The technology allows to lay a polyethylene pipe of smaller diameter in the pipeline, without destroying it.  

The technology allows a trenchless method of replacing steel and cast-iron water pipelines of 80 to 530 mm diameter with polyethylene pipes. Six kits of standard size sets have been designed.  

Principle of operation:

On the pneumatic hammer placed in the working well, a ribbed expander is mounted, to the rear part of which a pre-prepared whip of a new polyethylene pipeline is attached, tightened into the working well through an inclined well connected to the lower part of the working well. Cable winch with an anchor device located in the receiving well, passes through the replaced pipeline section and joins the front of the pneumatic hammer. When the pneumatic hammer operates, the blow is transmitted to the expander and through it to the old pipe. When the expander moves, the old pipe is destroyed and the soil is expanded to the outer diameter of the expander. In the resulting well, when the expander moves, a new pipe is welded into the whip using a pipe welding equipment. The design of the pneumatic hammer ensures stable operation of the pneumatic hammer with the length of the shifted section up to 150 m, the start is made by pulling the winch cable. The exhaust of the waste energy is carried into the replaced pipe.  

The technology allows trenchless method of laying a polyethylene pipe with diameters from 110 to 400 mm.  

Principle of operation:  

On the route of the pipeline being laid, intermediate installation wells are being constructed. Then a special pneumatic punch with a diameter of 70-90 mm passes the leading well. The cable from the winch is stretched to the leading well, the assembly wells are eliminated, an inclined well is laid in the working well, in which the impact unit with the expander is located.  

When laying a pipeline with a diameter of more than 300 mm, the expander is provided with windows for partial passage of soil into the pipeline being laid. The laying process is carried out with the simultaneous operation of the winch and pneumatic hammer.     

The technology is used for the construction of steel cases for various engineering communications. The diameter of the pipes is up to 1400 mm, length is up to 80 m. The use of the kit is also suitable for vertical dipping of metal piles. The consolidation of soil massifs, the installation of sheet piling is performed by plugging metal pipes into the ground. Pipes are rammed vertically or under the required slope. Diameter of steel pipes varies between 150-600 mm, immersion depth is up to 10 m, possible with or without cleaning.  

Principle of operation:  

Ramming of pipes in the ground is performed both with a closed (puncture) and with an open front end. Puncture is possible in all types of compressible soils. To improve the accuracy of the laying and the speed of immersion, depending on the characteristics of the soil, various head ends of the hammered pipe and special technological methods are used.

The technology of fixing pipes with an open front end allows increasing the diameter of the laid pipes due to a decrease in the drag of the ground, compared to fixing with a closed end. Pipes are fixed for the entire length of the transition, and then cleaned of the soil by a self-propelled soil-collecting device, or fixed in sections with alternating cleaning of each section.