Soft ground consolidation method

FIELD: building, particularly soft ground consolidation.

SUBSTANCE: method involves forcing injector in ground; supplying consolidating penetrative mortar in ground under pressure, which provides ground structure disintegration in soft grounds to create compacted area; repeatedly forcing injector in ground to form consolidation zones adjoining previous one to consolidate water-logged ground. The mortar comprises filler having density less than water density. Filter to remove water from area to be compacted is forced in ground before mortar injection.

EFFECT: extended field of method implementation along with increased operational reliability and efficiency.

1 ex

 

The present invention relates to the construction, in particular to strengthen the weak soil.

Closest to the present invention is a method of soil compaction, including immersion of the injector, the flow of the solution under pressure measuring and recording the pressure of the solution, the formation area of the compacted soil and the subsequent immersion of the injector with the formation of adjacent zones of compacted soil, and compaction of dispersed soil produced by injection of sealing and penetrating solution that destroys the structure of the soil in areas of attenuation with pre-compaction of the soil around the edge of the seal area (patent RF №2119009, priority 17.10.97, publ. 20.09.98 - prototype).

The disadvantage of this method when used to strengthen weak ground is that the sealing and penetrating solution when used to strengthen weak soil increases its precipitation due to its own weight.

The technical problem to be solved in the present invention, is to expand the field of application of the method to strengthen the soil while increasing operational reliability and efficiency.

The problem is solved in that way strengthening the weak soil, including immersion in the soil injector, the flow of sealing and penetrating solution to fill elem under pressure, ensure the destruction of the structure of the soil in areas of weakening with the formation of the seal area, and the subsequent submersion of the injector for the formation adjacent areas of the seal, while strengthening wetland soils in use as a filler filler with a density less than water, and before applying the specified solution is injected into the soil filter to drain water from the seal area.

Improving the reliability of weak bases is achieved by penetrating and sealing solution contains material providing a small weight that is needed to reduce and prevent unplanned settlements of soil, eventually leading to compaction of foundations under the foundations of buildings and structures, to increase their carrying capacity and reduce the deformation.

As the material having low density, can be used expanded clay gravel or sand, agloporit, vermiculite, perlite and the like, as well as foams, not subject to decay and significant compression. Introduction in the sealing solution of these materials allow small rainfall weak soils. The cross section of the injector, which provides the necessary pressure and feed rate of the solution is selected depending on the particle size of the material used.

The introduction of the filter outflow, which allows to increase the feed rate of solution, which is usually limited by the speed of the outflow water from the zone of compaction of soil, by increasing the speed of outflow of water under high pressure in the area of the seal, which in turn reduces energy consumption. The distance from the seal area, which set the filter depends on the permeability of the soil and the desired speed of the seal.

The proposed method is as follows. The injector is immersed in the soil, injected into the soil filter for water outflow and served in the weakened area of the soil solution with the filler, the density of which is less than the density of water. The solution serves under pressure, ensuring the destruction of the structure of the soil in areas of weakening with the formation of a zone of compacted soil around the edge of the seal area. For the formation of adjacent zones seals produce subsequent immersion of the injector.

An example implementation of the method.

In Foundation 2-storey house hunter in Kolyvan the area under a layer of alluvial sand small lies sapropel capacity of up to 2.6 m

As a result of compaction of sapropel building has been erratic rainfall, which led to the formation of cracks in load-bearing walls and to decrease the reference area of the floor slabs.

As to condense the sapropel mechanically in the array is almost impossible, it was decided vytesnennogo sealing and penetrating cement mortar with filler EPS.

Before applying the solution in the soil has introduced a filter for water outflow.

As a filler was used expanded polystyrene foam crumb particle size of 5-10 mm with a density of polystyrene 170 kg/m3. Sealing and penetrating the solution had a density of 320 kg/m3.

The solution was injected under the foundations of the sapropel layer through knock-injector with a lost tip under the pressure of 0.35 MPa. For each m3sapropel was entered 0.7 m3sealing and penetrating solution.

Subsequent immersion of the injector led to the formation of adjacent zones seals.

Thus, there has been a significant substitution of sapropel sealing and penetrating solution with a small seal.

On the sole of the sand layer household pressure amounted to 0.24 MPa vertical pressure taking into account the pressure of the Foundation of 0.38 MPa.

Sealing and penetrating solution created pressure pushing on the bottom of the sand layer is equal to 0.02 MPa.

If instead of this solution was introduced regular sealing and penetrating solution density 1800 kg/m3, there would be additional pressure on the sapropel and underlying layers of magnitude of 0.05 MPa, which would lead to more uneven precipitation. In our case, the pressure of plumb solution was passed through ground water lying significantly below vodou the PRS and even slightly reduced pressure Foundation on highly compressible layer of sapropel, a decrease in 70% of its capacity in the Foundation. The work done has led to a complete stabilization of the sediments of the building.

A way to strengthen weak soil, including immersion in the soil injector, the flow of sealing and penetrating solution with filler under pressure to ensure the destruction of the structure of the soil in areas of weakening with the formation of the seal area, and the subsequent submersion of the injector for the formation adjacent areas of the seal, wherein the strengthening of the wetland soil to use as a filler filler with a density less than water, and before applying the specified solution is injected into the soil filter to drain water from the seal area.



 

Same patents:

FIELD: improving or preserving soil or rock, particularly to reinforce railroad ground bed base.

SUBSTANCE: method involves forming drainage holes and removing accumulated water from railroad bed via the drainage holes; deepening injectors in ground from railroad bed side opposite to drainage holes or between them; forcedly water removing from railroad bed voids via drainage wells by directly injecting hardening mortar towards drainage wells through injectors.

EFFECT: increased efficiency of water removal from railroad bed and consolidation thereof.

1 ex, 2 dwg

FIELD: building, particularly pile foundations including floating piles.

SUBSTANCE: method involves injecting hardening mortar via injectors driven in ground in area between the piles and at pile ends for depth exceeding 1-2.5 m, wherein the injectors are spaced 1.5-2.0 meters apart. The hardening mortar pressure gradually increases. The hardening mortar is injected up to creation of hydraulic fracture cavities having 1.5-2.0 m radii around each injector. Then the injection operation is preformed under constant pressure of 2-10 atm to consolidate and reinforce ground, compress the piles to multiply load-bearing capacity thereof by 1.5-2 times.

EFFECT: increased load-bearing pile capacity due to increased side friction and head resistance.

3 cl, 1 dwg

FIELD: building, particularly to consolidate frozen ground in thawed zone under building foundation.

SUBSTANCE: method involves driving injector in ground; injecting consolidation penetrative mix under pressure, which provides ground structure in weakened ground zones and ground compaction along compacted zone perimeter; following injector driving to create compacted zones adjacent above zones. The consolidation penetrative mix is cooled salt solution comprising filler of material having lesser heat conductivity in comparison with ground to be compacted.

EFFECT: extended field of method application, increased reliability and efficiency.

5 cl, 1 ex, 1 dwg

FIELD: building, particularly to prevent slope ground sliding during industrial territory development.

SUBSTANCE: method involves driving injectors into sliding ground along profiles spaced apart 1.0-2.5 m, wherein the injectors are spaced apart 1.0-2.5 m and directed transversely to sliding ground edge and are submersed for depth 0.5-1.5 m below ground sliding plane; injecting consolidating mixture under increasing pressure to create hydraulic fracturing cavities; injecting consolidating mixture under constant pressure, which 1.1-1.3 times larger than ground pressure to create compacted zones having radii of 1.5-2.5 m around the injectors so that the compacted zones are overlapped or touch each other. During injector driving in ground having coarse cut rock pieces small-diameter pilot well is drilled. The pilot well diameter may be equal to 60 mm. The injector is installed in the well and forced in ground for necessary depth. After injection operation termination injector heads are sheared and plugged.

EFFECT: increased ground physical and mechanical properties for all sliding ground thickness and increased ground stability.

4 cl, 1 ex, 1 dwg

Injector // 2273696

FIELD: mining and building, particularly for rock strengthening and building structure reinforcement, namely for hardening liquid introduction.

SUBSTANCE: injector comprises supply pipeline provided with outer threads at inlet and outlet ends. The pipeline also has expandable hose and integrated check valve with longitudinal channels. The valve is closable in direction towards inlet pipeline end. The hose encloses the pipeline in air-tight manner by end parts thereof so that elongated annular space is created in-between. Transversal channels are created from one side of annular space in pipeline wall. Channel heads are closed in annular space with elastic sealing rings retained by neighboring fixing rings from both sides. Breakable disc and threaded bush with inner radial bridge are installed from end side of outlet supply pipeline end. The breakable disc is secured by means of pressure ring with cutting inner edge. The check valve comprises ball pressed against longitudinal channel head in supply pipeline, pressure spring and support ring. End of ring brought into contact with breakable disc is provided with transversal slot. Inner diameter of pressure ring is greater than inner diameter of support ring but is less than inner diameter of radial bridge in threaded bush.

EFFECT: improved injector adaptability to in-situ conditions.

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FIELD: building, particularly to form base member in ground.

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EFFECT: increased quality of base and foundation member production.

9 cl, 1 dwg

FIELD: building, particularly to reconstruct underground structures and reinforce foundations and engineering services in confined space.

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EFFECT: extended field of usage, reliability and safety of operations.

4 dwg

FIELD: building, particularly technology and equipment for structurally unstable ground, for instance for industrial and civil building.

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EFFECT: increased efficiency.

2 cl, 6 dwg, 1 ex, 1 tbl

FIELD: building, particularly to consolidate building or building structure foundation base.

SUBSTANCE: method involves driving injectors in ground; supplying high-pressure grout through ejectors; recording and measuring mortar pressure and forming grout body. Grout is injected simultaneously through three injectors installed in apexes of imaginary equilateral triangle with side dimensions equal to 5-10 injector diameters. Grout body forming is performed by driving and following lifting injectors for height equal to 1-3 injector diameters before start of grout supply to ejectors.

EFFECT: reduced labor inputs and increased efficiency of ground base consolidation due to providing of predetermined grout body shape in horizontal grout breaking plane.

3 dwg, 1 ex

FIELD: building, particularly to consolidate building or building structure foundation base.

SUBSTANCE: method involves driving injectors in ground; supplying high-pressure grout through ejectors; recording and measuring mortar pressure and forming grout body. Grout is injected simultaneously through at least three injectors installed along straight line and spaced equal distances one from another. The distances are equal to 5-10 injector diameters. Vertical grout body orientation is provided by driving injectors up to given mark reaching with following partial lifting thereof for height equal to 10-20 injector diameters and with their fixation at predetermined level before start of grout ejection process.

EFFECT: increased efficiency of ground base consolidation for ground of all types due to performing ground compaction along with forming vertical grout body of predetermined shape.

4 dwg, 2 ex

FIELD: road construction.

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FIELD: heat engineering constructions.

SUBSTANCE: invention can be used as supports of different construction on permafrost. Proposed heated pile has reinforced concrete or metal shaft with inner or outer heated pipe in form of ribbed evaporator and condensers provided with metal strip ribbing arranged over ground surface with inclination to vertical part of shaft. Novelty is that heated pile is made T-shaped, and heated pipe in form of ribbed evaporator is made symmetrically double relative to axis of shaft with connection of some ends or its evaporators, other ends being connected with condensers. Evaporator ribbing is made in form of upward convex ring surfaces with central passes secured on inner surfaces of walls of heated pipe evaporators and uniformly distributed in height, and metal strip ribbing of condensers is element of horizontal part of T-shaped heated pile.

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FIELD: building, particularly for reinforcing foundations and cast-in-place piles forming.

SUBSTANCE: device comprises percussion assembly including pneumatic drift and case surrounding thereof, as well as pipeline with pump. Case is rigidly secured to percussion assembly. Case comprises orifice made in front part thereof and adapted for receiving plug. Defined between the plug and the front part is cavity having cross-sectional area equal or more than that of pipeline located between percussion assembly and the case. Case has members for forming holes in ground located along longitudinal case axis and extending in radial direction thereof. The members have low rigidity and may be bent in radial direction. The members are provided with grooves formed in bending line thereof and rest brought into contact with case in extreme position.

EFFECT: increased efficiency.

7 cl, 7 dwg

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EFFECT: increased capacity, reduced time and labor inputs, improved technological effectiveness.

3 cl, 4 dwg, 2 ex

FIELD: building, particularly to consolidate building or building structure foundation base.

SUBSTANCE: method involves driving injectors in ground; supplying high-pressure grout through ejectors; recording and measuring mortar pressure and forming grout body. Grout is injected simultaneously through at least three injectors installed along straight line and spaced equal distances one from another. The distances are equal to 5-10 injector diameters. Vertical grout body orientation is provided by driving injectors up to given mark reaching with following partial lifting thereof for height equal to 10-20 injector diameters and with their fixation at predetermined level before start of grout ejection process.

EFFECT: increased efficiency of ground base consolidation for ground of all types due to performing ground compaction along with forming vertical grout body of predetermined shape.

4 dwg, 2 ex

FIELD: building, particularly to consolidate building or building structure foundation base.

SUBSTANCE: method involves driving injectors in ground; supplying high-pressure grout through ejectors; recording and measuring mortar pressure and forming grout body. Grout is injected simultaneously through three injectors installed in apexes of imaginary equilateral triangle with side dimensions equal to 5-10 injector diameters. Grout body forming is performed by driving and following lifting injectors for height equal to 1-3 injector diameters before start of grout supply to ejectors.

EFFECT: reduced labor inputs and increased efficiency of ground base consolidation due to providing of predetermined grout body shape in horizontal grout breaking plane.

3 dwg, 1 ex

FIELD: building, particularly technology and equipment for structurally unstable ground, for instance for industrial and civil building.

SUBSTANCE: method involves drilling well; forming longitudinal stress concentrator on wall thereof, locking upper well part along with injection zone separation; introducing binder under pressure in ground and forming plane of fracture in ground. Longitudinal concentrator is created by advancing, impressing and subsequent rolling of sliding punch-type rotary lentil-shaped disk within injection zone. The disc is connected with retainer through stop member. Upper well part is closed by filling gap between well wall and binder introduction means with quick-hardening material. Binder introduction means is made as perforated tube formed of elastic material and having diameter lesser than well diameter. Stress concentrator forming means has tube, head and cutter arranged in groove of the head. The cutter is made as sliding punch-type rotary lentil-shaped disk and connected to retainer by stop member including clamp and fork.

EFFECT: increased efficiency.

2 cl, 6 dwg, 1 ex, 1 tbl

FIELD: building, particularly to reconstruct underground structures and reinforce foundations and engineering services in confined space.

SUBSTANCE: method involves reinforcing foundation in vicinity of existent structures; building vertical tube with the use of well rings; excavating ground with the use of grab; breaking tunnel liner and driving tunnel. Method of foundation reinforcement near existent structures involves injecting quick-setting cement mix through perforated pipes installed in wells drilled through support foundation part and ground; drilling guiding wells beyond vertical tube below upper tunnel level and ground water level; providing guiding wells with casing pipes; injecting grouting mortar in ground through casing pipes up to grouting mortar appearance at well head; installing well rings having perforation orifices along ring perimeters and installing injectors in above orifices; additionally reinforcing contour part of vertical tube by supplying grouting mortar through orifices in well rings; breaking tunnel link section after well ring laying onto upper liner plate of deep tunnel by cutting orifices having necessary dimensions; removing tunnel link section and seating well ring on rock base; concreting well ring; forming two orifices in well ring before tunnel driving arranged in direction of tunnel reconstruction; driving the tunnel and installing support members.

EFFECT: extended field of usage, reliability and safety of operations.

4 dwg

FIELD: building, particularly to form base member in ground.

SUBSTANCE: method involves introducing excavation device in ground zone to loose the ground; mixing the loosened ground with liquid to obtain suspension, which hardens in the ground zone; before suspension hardening the suspension is drawn-off from the first ground zone area located above the second ground zone area; supplying at least part of suspension drawn-off from the first area back into the second ground zone area. Device for base member production comprises excavation rig adapted to loosen ground in ground area; supplying means to supply liquid to loosened ground and mixing means to mix loosened ground with liquid to obtain hardening suspension. The device is provided with outlet device to draw-off the suspension from the first ground zone area and supply device to repeatedly supply at least part of suspension drawn-off from the first area to the second ground zone area.

EFFECT: increased quality of base and foundation member production.

9 cl, 1 dwg

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