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Method of recovery of underground structures

The invention is directed to solving the problem of reconstruction of underground facilities located in unstable water-saturated soils (quicksand). Underground structures (subway tunnels, sewers, etc.), built in unstable soils, often in the course of operation make a strong drawdown, this disturbed their strength and integrity, and these expensive buildings will fill with water and fail. New in this method is the operation of raising the walling of underground structures by creating increased pressure of the soil under the structure and reduce this pressure on him. This goal is achieved by pumping a mixture of sand with water in the zone located under the structure and selection of soil from the area located above the construction. For sealing of the building envelope structures during the operation of cryogenic liquid used. 1 Il.

DESCRIPTION OF THE PATENT OF THE

The invention relates to the field of construction, namely to restore sagging, have lost their integrity and, as a rule, flooded underground structures.

Known way to restore the flooded underground structures, including the establishment at the entrance to the construction chambers, podcastinga air, water diversion and creation of bridges [1].

The disadvantage of this method is its low efficiency.

The closest solution to the present invention is a method of restoring a flooded underground structures, including the establishment at the entrance to the construction camera, seal its internal volume by freezing, the supply to the building compressed air, water drainage and the creation of bridges [2].

The disadvantage of this method is the lack of shyrokoluzhansky its use, especially in conditions where underground construction, the tube is installed in unstable water-saturated soils (quicksand). With the drawdown of underground structures is lost the integrity of its lining along the entire length, for this reason there is a removal of the quicksand into the compound together with water seeping in there, as a consequence, leaching of bases under buildings and even a large drawdown. Thus there is a self-developing process of destruction of underground structures.

The object of the invention is the provision of the rehabilitation of underground structures built in unstable water-saturated soils (quicksand) and received as a result of the operation of a significant drawdown with depressurization walling (tubing joints).

The problem is solved due to the fact that in the method of recovery of underground structures, including the establishment at the entrance to the building chamber, the compressed air supply, water drainage, sealing envelope (segment) by freezing, after sealing walling is pressurized under construction by pumping under this construction a mixture of coarse sand with water through inventory or specially created holes in the lining (the tubing), drilled from the ground surface injection well, and at the same time reduce the pressure on the construction, by taking over it of the soil (quicksand) through drilled from the earth’s surface in the intake bore and through the bypass of the soil from the top down through the building through pipelines using compressors and after the establishment of facilities in its initial (design) position and closing of cracks in the lining (between the tubing) the flow of a mixture of coarse sand with water for the construction and selection of unstable water-saturated soil (quicksand) above it shall cease, again the lining is sealed by freezing, the holes in the lining (in the tubing) close the inventory tubes.

The drawing shows the technological scheme of the method.

Method of recovery of underground structures is as follows.

Set at the entrance to the construction of the lock chamber, after which the construction of the water was removed by displacing it with compressed air if there are significant inflows or conventional pumping solutions, if these tributaries is negligible. Then freeze all parts of the lining, where there are unorganized water with removal of quicksand and locally the sections of tubing where the tube. After sealing the tubing outside the ice tube segment vivenciada and establish in their place the nozzles with check valves and gate valves. Then through these pipes by, for example, concrete pump coarse sand with water under the Foundation of the construction, the pressure on the construction increases. Under the influence of this pressure the structure begins to move up. To reduce the opposition to this move from the surface of the earth well is being drilled to the level of the top of the lining structures and away some of the soil, thereby reducing in this zone pressure and helping to move the construction up. For the task, along with that from the surface of the earth are drilled the injection wells to the level lower than the mark of the structure, and it serves the same mixture of coarse sand with water to increase the pressure under the building. For these purposes, can be used well earlier in the construction of facilities to be used for freezing soil. In addition, to improve the efficiency of this method by the blower is pumped through pipelines are unstable, saturated soil (quicksand) from the area located above the construction zone that is located directly under the building. To do this, use the same inventory holes in the tubing.

After moving underground structure in its initial (design) position of the feeding and pumping a mixture of coarse sand and quicksand is stopped, and the equipment and piping is removed, the tubing set inventory tube, pre-zagermetizirovat these tubing freezing.

The method performed by the device including the lock chamber 1, located at the entrance to the underground facility. The compressed air is provided by compressor 2 with a duct 3, and the removal of water-pump 4 to conduit 5. The supply of cold provides holodostojkie, for example, Karaganova the container 6, with lines 7 and heat exchanger 8. Feeding the mixture of coarse sand with water is carried out inside the building, the concrete pump 9 through conduit 10 and through the borehole 11 with the surface of the earth the concrete pump 12. Transfer the floaters from the area located above the construction zone located under the structure, carried out by concrete pump 13. For relief from the pressure zone located over the structure, provided the bore 14.

The device operates as follows.

The compressor 2 via the air duct 3 delivers the compressed air into the compound, the pressure in the latter rises, allowing the removal of water from the structure by means of pump 4 and conduit 5. The increased pressure prevents the penetration of water into the compound. After drainage of underground structures from the tank 6 is fed cryogenic liquid, e.g. liquid nitrogen, through pipeline 7 to the coil 8 that freeze up all the grooves and the tubing in the locations of the tubes from the outside. Tube segment vivenciada and installed in their place the nozzles through the piping 10 of the concrete pump 9 is fed a mixture of coarse sand with water under the structure, the pressure underneath is increased. The same mixture is fed from the surface of the land for the construction of the well 11 via a concrete pump 12. With the same purpose included the 13 pumps that pump water from the area located above the construction zone under construction. The pressure inside the structure increases and it begins to rise upwards, compressing the top layers of quicksand. When the pressure over the structure, part of the quicksand goes through the well 14, the pressure under the structure in this way is reduced to an initial.

After you install the structures in the original (design) position again by the heat exchanger 8 is supplied cryogen to freeze the tubing and nozzles are threaded instead of tube inventory.

Coarse sand is located directly behind the lining, will act as a reverse filter, except getting into the compound of quicksand and the drawdown for this reason.

The proposed method allows to restore the unique building, for example, land subsided and flooded subway, underground sewers, etc.

THE FORMULA OF THE INVENTION

Method of recovery of underground structures, including the establishment at the entrance to the building chamber, the compressed air supply, water drainage, sealing envelope (segment) by freezing, characterized in that after sealing of the walling is pressurized under construction by pumping under this construction a mixture of coarse sand with water through inventory or specially created holes in the lining (the tubing), and through drilled from the ground surface injection well and simultaneously reduce the pressure on the construction by taking over it of the soil (quicksand) through drilled from the earth’s surface in the intake bore and through the bypass of the soil from the top down through the building through pipelines using compressors and after the establishment of facilities in its initial (design) position and closing of cracks in the lining (between the tubing) the flow of a mixture of coarse sand with water for the construction and selection of unstable water-saturated soil (quicksand) over him cease, the lining again is sealed by freezing, the holes in the lining (in the tubing) close the inventory tubes.

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