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Polyurethane Grouting Technologies
Dec 26, 2018

Introduction

Grouting with polyurethane resins represents an effective method of improvement of

mechanical and sealing properties of soil and rock environment and constructions. The

principle of grouting technologies is injection of liquid grouting material into the rock

environment or construction under pressure. During the grouting process, fissures and

pores are filled with the grouting material, which subsequently hardens and connects the

disintegrated parts of the rock mass or grains of loose material. Polyurethane grouting

technologies started to be used in the 80s of the 20th century in the mining industry. In the

last recent years, PU grouting technologies spread significantly from the mining

applications to civil engineering and geotechnics. The application possibilities have a rising

tendency and new possibilities occur. Currently, grouting technologies are used mainly in

the following fields:

Underground constructions,tunneling

Filling of caverns and voids

Protection when crossing fault zones

Stabilization of loose material in the foreland of excavation

Securing of excavation during tunnel construction

Preventive improvement of mechanical properties of the rock mass in the line of

the workings

Sealing and stopping of water inflows into the construction

Anchoring of soil and rocks

Strengthening and stabilization of overburden,etc.

Mining

Strengthening and stabilization of deposit layers before exploitation

Crossing of fault zones

Securing of the overburden

Stabilization of the surrounding of the mine workings

Lowering of permeability of the rock mass

Strengthening of coal in areas with rock burst risk

Limitation of the mine wind blowing

Anchoring of soil and rocks

Stabilization and sealing of old mine pits,etc.

Geotechnical works

Stabilization of slopes, embankments, excavations

Anchoring of retaining walls

Construction of underground barriers with low permeability

Stabilization of unconsolidated soil

Sealing of dilatation joints

Micropiling of foundations

Stabilization of landslides

Civil engineering

Strengthening of subsoil (also under groundwater level)

Securing of stability of structures threatened by mining or construction

works

Strengthening of brick or stone masonry

Restoration of insulation of structures

Sealing of utility entries into constructions

Sealing of joints

Stopping of water inflows into constructions and etc.

Foundation of buildings

Sealing and anchoring of bottoms and walls of construction pits under

groundwater table

Anchoring of walls of construction pits

Improvement of subsoil conditions before starting of the construction

Micropiling in soil with low bearing capacity

Foundation of buildings in undermined areas

Water management works

Sealing of joints on dams

Anchoring and sealing of flood dams, anchoring of bottom of water canals

Anchoring and strengthening of embankments

Repair of concrete structures under water

Limitation of underflowing of dams

Bridges and roads

Strengthening and sealing of brick and stone masonry on bridges

Repair of cracks in the constructions

Improvement of subsoil parameters under pillars (also in rivers)

Anchoring and micropiling of foundations


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