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activity of Kombest Co is concerned with the applying of the trenchless
technology for laying and reconstructing the municipal engineering
communication pipelines and building cast-in-place piles.
High priority of trenchless technologies is obvious due to money
saving as compared to the application of conventional trench methods
and the elimination of road covering destruction under the conditions
of high housing density or large depth of pipe laying.
|Trenchless Pipeline Replacement Process
The process developed provides the trenchless replacement of steel,
iron or non-metallic worn-out pipelines of 100mm -350mm diameter
for plastic pipes of 160mm 400mm diameter. A set of equipment
consists of a witch, an anchor, chain wrenches, an instrument set,
air-supplying hoses. The procedure is as follows:
A compound expander is mounted on a pneumatic machine, located
in an entrance man-hole. An air-supplying hose and the winch cable,
passing through a pipe section to be replaced, are connected to
a rear or front end of the machine (it depends on peculiarities
of the technological process applied). When moving along the pipe
the expander destroys it and stamps its fragments info the ground
and pulls a new pipe info a hole formed. A new pipe is extended
by pipe sections in the entrance manhole.
See: Equipment kits and technology for
rehabilitation of water-supply and canalization systems
|Trenchless Pipe Laying Process
process for piling pipes with open front end provides an opportunity
to increase a diameter of a pipe to be laid by a factor of two at
the expense of reduction in soil frontal resistance as compared
to the puncture process. The soil cork is eliminated in the moving
pipe due to the impact load action. Pipes are stuffed with soil
along the total length and then the soil is cleaned out with a mobile
soil intaking device. A set of equipment consists of a pneumatic
impact device for piling pipes, a pneumatic impact device for actuating
a soil intaking device, an adapter, guiding frame, a pneumatic winch,
a soil intake device (sand pump), air-supplying hoses.
The process developed provides trenchless laying of pipelines of
159mm -1400mm diameter.
|Construction of Concrete Cast-in-Place Piles
for the cast-in-place pile construction implies multiple operations
of filling a hole sank by a pneumatic punch with the semi-dry concrete
mixture and subsequent sinking the filled hole by a pneumatic punch.
A pile is formed by pressing in walls of a hole, in doing so a good
cohesion of a pile with soil is provided. Both vertical and inclined
piles cam be used for stregthening of foundations. And the strengthening
of foundations takes place due to soil stabilization and foundation's
load on a pile. Depending on the character of load the pile can
be reinforced or unreinforced. The outer diameter varies in the
range of 150mm-300mm and it depends on the number of punch's passings
through a filled hole and on a type of a device used in the process.
Maximum length of a pile depends on the soil load, specifications
and varies in the range of 6-10mm.
A set of equipment consists of a pneumatic reversible punch,
a compressor, a mixer, a tripod with a hand witch or a starting
device. Cast-in-place piles are efficient for repairment or strengthening
of different constructions, strengthening of slopes, building of
supporting walls, building of anchor strengthening, deep compressing
of settled or bulk soil.
The new generation of Russian pneumatic impact machines have got
quite specific features as compared to foreign annalogues:
- mounting and demounting of working equipment can be carried
out directly in a man-hole;
- repairment and replacement of pneumatic impact machines is possible
just under working conditions;
- supply of the compressed air (energy carrier) from the front
or rear end of the machine.
The Russian and foreign patents for the said technology and equipment
sets are available. The commercial production of equipment sets
has been launched at Novosibirsk plant "Siblitmash". KOMBEST
Co. guarantees the accident-free work of the equipment for 1.5 years.
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