EP3887603B1 - Verfahren zur bodenbehandlung - Google Patents

Verfahren zur bodenbehandlung Download PDF

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Publication number
EP3887603B1
EP3887603B1 EP19835686.7A EP19835686A EP3887603B1 EP 3887603 B1 EP3887603 B1 EP 3887603B1 EP 19835686 A EP19835686 A EP 19835686A EP 3887603 B1 EP3887603 B1 EP 3887603B1
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EP
European Patent Office
Prior art keywords
tube
borehole
injection
soil
blocking element
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Application number
EP19835686.7A
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English (en)
French (fr)
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EP3887603A1 (de
Inventor
Francisco DA COSTA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Publication of EP3887603A1 publication Critical patent/EP3887603A1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil

Definitions

  • the present invention relates to the field of treatment of a floor in order to modify its physical properties such as, for example, waterproofing or solidity.
  • the invention relates more precisely to a process for treating such soil.
  • This tube makes it possible to maintain the side wall of the borehole and to carry out soil treatment independently of the state of the soil at the different depths considered along the borehole.
  • the tube is extracted from the borehole.
  • a disadvantage of this type of process is that during injection, the injection fluid is projected partly towards the tube so that it covers said tube and infiltrates between the tube and the wall of the borehole.
  • the injection fluid increases the friction between the tube and the ground, which makes it very difficult to move or extract the tube from the borehole.
  • the injection fluid solidifies so that the tube is caught in the injection fluid, especially when it is a stiffening product.
  • the tube is then blocked in the borehole by the injection fluid, in which case it must be left in the borehole, which is not desirable.
  • the injection fluid percolates and spreads step by step in the ground so that it bypasses the shutter.
  • the injection fluid possibly mixed with soil particles, then forms cuttings which finally infiltrate between the tube and the side wall of the borehole.
  • the shutter is therefore insufficient to overcome the blockage of the tube in the drilling, caused by the injection fluid.
  • An aim of the present invention is to propose a method of treating soil which remedies the aforementioned problems.
  • the method according to the invention makes it possible to treat one or more selected portions of soil using the injection fluid having physical properties adapted to the desired treatment.
  • Drilling is preferably carried out using a drilling machine comprising a ground cutting tool. It has substantially the shape of a cylinder having a diameter.
  • the drilling advantageously includes a edge in the upper part, opening out of the borehole.
  • the drilling is preferably carried out so as to pass through the portion of soil to be treated, and the drilling depth is chosen so that the portion of soil to be treated is located between the bottom and the edge of the drilling.
  • the drilling direction may be substantially vertical or inclined relative to the vertical.
  • the tube preferably has the shape of a cylinder having a diameter slightly smaller than the diameter of the borehole, so that it can easily be introduced into said borehole. It preferably has a length less than the drilling depth.
  • the tube is preferably configured to be placed in the borehole facing a portion of unstable or fractured soil, likely to collapse. It then makes it possible to maintain the side wall of the borehole at a height equal to the first predetermined depth, in order to prevent said side wall from collapsing.
  • the distal end of the tube is configured to face the bottom of the borehole when the tube is inserted into the borehole.
  • the first predetermined depth is the depth to which said distal end of the tube extends when placed in the borehole.
  • the tube preferably includes a proximal end configured to extend outside the borehole.
  • the drilling tube can be moved in the drilling so as to successively support the side wall of the drilling at different depths.
  • the tube can be moved in a direction opposite to the bottom of the borehole, so as to gradually increase the height of the injection zone.
  • the injection fluid can be injected successively at different depths in order to treat a plurality of portions of soil.
  • the method may comprise the supply and positioning of a plurality of tubes at different depths in order to consolidate the side wall of the borehole at said different depths.
  • the injection fluid is injected from the injection zone, inside the borehole, preferably towards the side wall of the borehole.
  • the first shutter element advantageously has a cylindrical shape and a diameter substantially equal to the diameter of the borehole. When introduced into the borehole, it preferably forms a barrier airtight to prevent the projection of fluid outside the projection zone and therefore directly towards the tube.
  • the injection fluid risks infiltrating into the ground and spreading there by percolation.
  • the injection fluid possibly mixed with soil particles, risks bypassing the first sealing element and coming into contact with the drilling tube, via the soil.
  • the injection fluid possibly mixed with the soil particles, then forms cuttings infiltrating between the tube and the side wall of the borehole. These cuttings disrupt the movement and extraction of the tube in relation to drilling.
  • the cuttings evacuation step then makes it possible to remove all or part of these cuttings and therefore the injection fluid in contact with the tube.
  • An advantage is to prevent the tube from being caught in the injection fluid, particularly if it is a stiffening product such as cement.
  • the cuttings evacuation step also makes it possible to lighten the tube and reduce the friction between the tube and the side wall of the drilling, generated by said cuttings.
  • the cuttings evacuation step therefore facilitates the movement of the tube in the drilling as well as the extraction of said tube out of the drilling.
  • the cuttings are evacuated outside the borehole and can be treated and reused later.
  • the evacuation of the debris can be carried out from the start of the injection of the injection fluid or in a delayed manner.
  • the cuttings evacuation step is preferably carried out before solidification of the injection fluid in contact with the tube, particularly when it is a grout, for example cement.
  • the step of removing the debris comprises cleaning the exterior surface of the tube.
  • the step of cleaning the exterior surface of the tube can be carried out by suction of the cuttings, by rubbing the exterior surface of the tube or by any other technique making it possible to reduce the quantity of debris covering said exterior surface of the tube.
  • the step of cleaning the exterior surface of the tube comprises rotating said tube around the drilling direction. This rotation makes it possible to avoid the solidification of the injection fluid in contact with the tube and therefore the blocking of the tube in the drilling.
  • rotating the tube tends to move the debris towards the ends of the tube and therefore clean the exterior surface of the tube.
  • rotating the tube generates friction between the outer surface of the tube and the side wall of the borehole making it possible to remove the cuttings covering said outer surface of the tube.
  • the speed of rotation of the tube is preferably relatively slow, of the order of a few revolutions per minute.
  • the rotation speed of the tube can advantageously be controlled, monitored and recorded.
  • Tube rotation can be manually controlled by an operator or triggered automatically in response to a trigger signal.
  • the step of rotating the tube is carried out using a displacement device configured to cause the tube to rotate around the drilling direction.
  • the movement device can also be configured to move the tube in translation, in particular according to the drilling direction. This makes it possible to easily introduce the tube into the borehole and to easily adjust the first determined depth to which the tube extends in the borehole, while rotating said tube.
  • the displacement device is advantageously arranged outside the borehole and cooperates with the tube so that the proximal end of the tube also extends outside the borehole.
  • the torque applied to the tube when it rotates can advantageously be controlled.
  • the distal end of the tube carries a cutting member, and the step of drilling the ground is carried out using the tube moved in the ground in the drilling direction up to the drilling depth.
  • the diameter of the tube is substantially equal to the diameter of the borehole, whereby the tube substantially matches the shape of the borehole.
  • the method comprises the steps according to which a torque sensor is provided, the resistant torque applied to the tube is measured using the torque sensor, and a possible presence of cuttings in contact with the tube is detected, thanks to the torque resistance measured.
  • An advantage is to be able to trigger the rotation of the tube only in the presence of debris in contact with said tube. This reduces wear on the tube as well as the fuel costs required to rotate it.
  • said at least one first shutter element has a retracted position in which it can be moved in the borehole and an deployed position in which it cooperates with the side wall of the borehole to seal the borehole in order to define said zone of injection.
  • Another advantage is to be able to adjust the position of the first shutter element at any time, for example when it is necessary to successively treat different portions of soil at different depths.
  • the first shutter element is placed in the retracted position, moved, then placed again in the deployed position. This also makes it possible to adjust the dimensions of the injection zone.
  • said at least one first shutter element is inflatable. In the retracted position, the sealing element is deflated while it is inflated when placed in the deployed position.
  • An advantage is to be able to easily and quickly place the first obturation element in the retracted position or in the deployed position.
  • Another advantage is that the first sealing element matches the side wall of the borehole more effectively once inflated, which reduces the risk of leakage and therefore infiltration of injection fluid between said side wall of the borehole and said first element. shutter.
  • the sealing element can be connected to an inflation member placed outside the borehole, allowing it to be inflated or deflated from outside the borehole.
  • the introduction of said at least one first shutter element into the borehole comprises the introduction of said first shutter element, in the retracted position, into the tube and the movement of said first shutter element along the tube until at the second predetermined depth.
  • the tube is therefore placed in the borehole before introducing and positioning the first sealing element.
  • the injection of the injection fluid is carried out using an injection device comprising an injection channel extending inside the tube and opening into the injection zone.
  • the injection channel is preferably connected to an injection fluid supply source located outside the borehole and makes it possible to bring the injection fluid from outside the borehole into the injection zone.
  • the tube helps protect the injection channel against the collapse of the side wall of the borehole and reduces the risk of damage to said injection channel.
  • the injection device comprises an injection nozzle disposed at the distal end of the injection channel and configured to be introduced into the injection zone, at a desired depth.
  • the injection device is preferably moved along the borehole, in the injection zone, in order to treat a plurality of portions of soil at different depths.
  • the injection channel passes through said at least one first sealing element, whereby the injection fluid can be easily injected into the injection zone, between the first element shutter and the bottom of the borehole.
  • the first sealing element therefore extends radially around the injection channel.
  • the first shutter element substantially matches the shape of the injection channel, so as to reduce the risk of injection fluid infiltration between said first shutter element and said injection channel. injection.
  • the first sealing element and the injection channel are introduced simultaneously into the borehole.
  • the treatment method comprises a step according to which a second sealing element is introduced into the drilling at a third predetermined depth between the second predetermined depth and the drilling depth, so that it is between said at least a first sealing element and the bottom of the borehole, said second sealing element being configured to seal the borehole so that the injection zone extends between the first sealing element, the second sealing element and the side wall of the borehole.
  • the second sealing element prevents the injection of fluid directly between the bottom of the borehole and said second sealing element.
  • the second shutter element is preferably identical to the first shutter element. It is preferably inflatable and can be easily moved inside the borehole.
  • the first and second shutter elements are fixed relative to each other so that the distance separating them remains constant and they can be moved together.
  • the first and second shutter elements can be movable relative to each other.
  • the height of the injection zone, considered according to the drilling direction can be adjusted by moving the first and second shutter elements relative to each other, in order to modify the distance separating them.
  • the first and second sealing elements are introduced into the borehole at the same time. They are preferably both introduced into the tube in the retracted position, positioned in the borehole then placed in the deployed position.
  • the injection fluid is chosen from a sealing product and a hardenable mud configured to consolidate the soil.
  • the waterproofing product is particularly suitable when it is necessary to treat the ground to reduce water infiltration, for example under a dam.
  • the use of a hardenable mud is particularly suitable for reinforcing the ground, when it is intended to support a building.
  • the injection fluid may be a grout or a concrete.
  • the injection fluid is preferably a fluid capable of infiltrating and percolating in porous soil, in order to spread there to treat an extended portion of soil around the borehole.
  • the step of cleaning the exterior surface of the tube comprises the injection of a washing fluid around the tube.
  • the washing fluid is advantageously projected evenly over the entire exterior surface of the tube.
  • the injection of the washing fluid can be triggered as soon as the injection fluid is injected or in a delayed manner.
  • the step of cleaning the outer surface of the tube includes injecting the washing fluid or rotating the tube simultaneously with the injection of the washing fluid.
  • the washing fluid is injected if the presence of cuttings in contact with the tube is detected using the torque sensor.
  • An advantage is not to inject the washing fluid unnecessarily, in the absence of debris in contact with the tube. This reduces the amount of washing fluid needed and therefore the costs associated with cleaning the tube.
  • the injection of the washing fluid can be triggered when the quantity of cuttings detected in contact with the tube is greater than a predetermined threshold.
  • the washing fluid is injected through the distal end of the tube towards the bottom of the borehole.
  • the tube is used as a conduit, such that fluid is introduced into the tube from its proximal end, then brought to the distal end of the tube and finally injected into the borehole through its distal end.
  • the washing fluid fills then an upper part of the borehole located above the first sealing element and infiltrates between the exterior surface of the tube and the side wall of the borehole.
  • the cuttings present in this upper part of the drilling then mix with the washing fluid and are carried towards the upper end of the drilling.
  • the washing fluid then flushes the cuttings out of the borehole. This step allows the debris to be evacuated and the exterior surface of the tube to be effectively cleaned.
  • the step of injecting a washing fluid is carried out using an injection head configured to inject the washing fluid into the tube, the injection head comprising a fixed part and a pivoting part, the pivoting part being configured to cooperate with the tube.
  • the injection head is preferably configured to be connected to a washing fluid supply source.
  • the injection head can advantageously be removably mounted at the proximal end of the tube, so that the pivoting part cooperates with said proximal end of the tube.
  • the fixed part can be integral with a device for moving the tube.
  • the injection head advantageously comprises a hole passing through the fixed and pivoting parts in the drilling direction.
  • the hole therefore passes through the injection head, preferably right through.
  • Said hole is configured to receive an injection channel.
  • the first sealing element can advantageously be introduced through said through hole and guided into the borehole via the injection head then the tube.
  • the injection head advantageously comprises a side wall in which an orifice is provided. Said orifice passes through the fixed part and the pivoting part and opens into the through hole. Said orifice is configured to be connected to a washing fluid supply source. Also, the fluid is injected into the hole passing through the injection head, via the orifice made in its side wall. The washing fluid is then guided into the tube. The washing fluid flows advantageously between the tube and the injection channel.
  • the cuttings evacuation device comprises a displacement device configured to rotate the tube around the drilling direction.
  • the debris evacuation device comprises an injection head for injecting a washing fluid around the tube.
  • the invention relates to a method of treating soil. This process makes it possible to modify the physical properties of a portion of soil to be treated, by injecting an injection fluid.
  • the ground S notably comprises a first unstable part S1 and a second unstable part S2 extending above the first unstable part S1.
  • a hollow and cylindrical tube 10 having a proximal end 10a and a distal end 10b, opposite the distal end 10a.
  • the distal end 10b corresponds to the lower end of the tube and the proximal end 10a corresponds to the upper end of the tube 10.
  • the tube 10 comprises at its distal end 10b a plurality of cutting teeth 12 forming a cutting member for cutting the ground S.
  • a drilling machine 14 provided with a mast 16 and a movement device 18.
  • the movement device 18 is mounted sliding along the mast 16.
  • the tube 10 cooperates with the displacement device 18 so that said displacement device 18 is configured to drive said tube 10 in rotation.
  • the speed of rotation of the tube 10 can advantageously be controlled and adjusted.
  • the displacement device 18 also comprises a torque sensor 19, making it possible to measure a resistant torque applied to the tube 10, opposing its rotation.
  • the method comprises a first step of carrying out a drilling using the tube 10.
  • the displacement device 18 is translated along the mast 16, downwards, so as to move the tube 10 substantially vertically downwards.
  • the movement device 18 drives the tube 10 in rotation, in order to cut the ground using the cutting teeth 12, so as to carry out said drilling F.
  • the tube therefore constitutes a drilling tube.
  • drilling F could be carried out using a drilling tool independent of the tube.
  • the drilling F is carried out so as to at least partially pass through the portions of soil Z1, Z2 to be treated.
  • the borehole includes a bottom Fa and a side wall Fb.
  • said drilling F extends in a drilling direction Y and up to a drilling depth Pf.
  • the drilling also passes through the first and second parts of unstable soil S1, S2.
  • a second step is carried out according to which the displacement device 18 is translated along the mast 16, upwards.
  • the tube 10, cooperating with the movement device 18, is therefore also moved upwards and goes up along the borehole F.
  • the tube is then positioned in the borehole at a first predetermined depth P1. More precisely, the tube is positioned so that its distal end 10b extends to said first predetermined depth P1.
  • Said predetermined depth P1 is less than the drilling depth Pf and less than the depth to which the first portion of soil Z1 to be treated extends. Also, the tube extends above the portion of soil to be treated and opposite the first and second parts of unstable soil S1, S2, likely to collapse. The tube 10 extends in the borehole F, in the drilling direction Y.
  • the tube then makes it possible to maintain the side wall Fb of the borehole at a height equal to the first predetermined depth P1, and therefore in particular at the level of the first and second parts of unstable ground S1, S2, in order to prevent said side wall Fb from s 'collapse.
  • the diameter of the tube 10 is very slightly less than the diameter of the borehole F so that it substantially matches the side wall Fb of the borehole F.
  • the tube 10 is provided at its proximal end 10a with an injection head 20.
  • An example of an injection head 20 is illustrated in figures 12 and 13 . It is preferably mounted removably at the proximal end 10a of the tube.
  • the injection head 20 comprises a fixed part 22 secured to the displacement device 18, via a rod 23.
  • the injection head 20 further comprises a pivoting part 24 configured to pivot relative to the fixed part 22.
  • the injection head 20 comprises a hole 26 passing through the fixed 22 and pivoting 24 parts and therefore passing through the injection head, from top to bottom along an axis. Said axis coincides with the drilling direction Y when the tube 10 extends in said drilling.
  • the fixed 22 and pivoting 24 parts have a substantially cylindrical shape.
  • the pivoting part 24 cooperates with the proximal end 10a of the tube 10, so that it pivots in the drilling direction Y when the tube is rotated.
  • the injection head further comprises an orifice 25 passing through the fixed 22 and pivoting 24 parts radially.
  • the orifice 25 opens into the through hole 26. Said orifice 25 is configured to be connected to a washing fluid supply source.
  • the injection head also includes pivoting joints 27 arranged between the pivoting part 24 and the fixed part 22.
  • a first shutter element 30 is then introduced into the borehole, as can be seen in the Figure 3 .
  • the first shutter element 30 is inflatable and has a retracted position in which it is deflated, and an deployed position in which it is inflated. It is further mounted on an injection channel 32, so that said injection channel 32 passes through the first closing element 30.
  • the first closing element 30 is further connected to an inflation member disposed outside the drilling via an inflation pipe. For reasons of readability, said inflation member and said pipe are not shown.
  • the first closing element 30 is initially placed in the retracted position, around the injection channel 32. Said injection channel and said first closing element in the retracted position are then introduced jointly into the tube 10, via the hole 24 passing through the injection head 20 , and translated towards the bottom Fa of the borehole F. They are moved until the first sealing element 30 exits the tube through its distal end 10b.
  • the first shutter element is brought to a second depth predetermined depth P2, between the first predetermined depth P1 and the drilling depth Pf.
  • the first sealing element 30 then extends between the tube 10 and the bottom of the drilling Fa.
  • the inflation pipe and the injection channel 32 extend in the tube 10 and in the through hole 26 of the injection head 20 and open out of said injection head through its upper end.
  • Air is then injected into the first closing element 30, via the pipe, using the inflation member.
  • the first obturation element is then inflated and placed in the deployed position, illustrated in Figure 4 . It can therefore be deployed from outside the borehole.
  • the first shutter element 30 matches the side wall Fb of the borehole F so that it forms a plug between the drilling parts arranged above and below said first shutter element 30.
  • the first element shutter then defines an injection zone 34 located between said first shutter element 30, the bottom Fa of the borehole F and the side wall Fb of the borehole.
  • the injection zone 34 is arranged opposite the first portion of soil to be treated Z1.
  • the injection channel 32 is preferably connected to a supply source of injection fluid. As we see on the Figure 4 , the injection channel 32 passes through the injection head 20 and also extends inside the tube 10. It comprises a proximal end 32a projecting from the proximal end 10a of the tube and from the upper end of the injection head 20. The proximal end 32a of the injection channel 32 is connected to the injection fluid supply source. The injection channel 32 also comprises a distal end 32b then extending into the injection zone 34, below the first obturation element 30. The distal end of the injection channel 32 is provided with a nozzle injection 36 configured to project an injection fluid. The injection channel 32 and the injection nozzle 36 form part of an injection device.
  • the injection fluid may consist of a sealant if it is necessary to seal the ground or a hardening slurry if it is necessary to consolidate the ground. It can also be a grout.
  • the injection fluid is introduced into the injection channel 32, at the proximal end 32a of said injection channel and propagates in said injection channel from its proximal end to its distal end 32b. It is then injected into the injection zone 34 thanks to the injection nozzle 36 which allows it to be projected substantially radially towards the side wall Fb of the borehole F.
  • the injected injection fluid is represented by the arrows in solid lines.
  • the injection fluid then infiltrates into the soil S and spreads into the first portion of soil Z1 to be treated. This is how the soil is treated.
  • the first closing element 30 makes it possible to avoid direct projection of the injection fluid towards the tube 10.
  • the injection fluid is however likely to bypass the first closing element and to accumulate between said first closing element 30 and the tube 10 or to infiltrate between the tube 10 and the side wall Fb of the drilling.
  • the injection fluid possibly mixed with soil particles, forms cuttings which risk infiltrating between the side wall of the borehole and an exterior surface 11 of the tube. This is not desirable to the extent that these cuttings risk disrupting the movement of the tube 10 or even blocking the tube in the drilling.
  • a step is carried out for evacuating the cuttings located between the tube 10 and the side wall Fb of the drilling, simultaneously with the injection of the injection fluid into the injection zone 34, so as to remove the debris in contact with said tube. More precisely, we carry out a step of cleaning the exterior surface 11 of the tube. Advantageously, only the part of the tube which is in the ground is cleaned.
  • the resistant torque applied to the tube is measured using the torque sensor 19.
  • this resistant torque is greater than a predetermined threshold, it is measured. deduces the presence of cuttings, and in particular injection fluid, in contact with the tube 10 and the cleaning of the tube and the evacuation of the cuttings are then triggered.
  • the cuttings evacuation step could be triggered from the start of the injection of the injection fluid into the injection zone 34.
  • the tube 10 In order to clean the tube 10 and evacuate the debris, the tube 10 is rotated, using the displacement device 18, around an axis of rotation substantially coincident with the longitudinal direction Y of the drilling F. Thanks at this rotation, the injection fluid in contact with the tube does not risk drying out and solidifying. The risk of the tube getting stuck in the ground is therefore greatly reduced. Furthermore, the rotational movement of the tube 10 has the effect of moving the cuttings located between said tube and the side wall Fb of the borehole towards the proximal end 10a of the tube.
  • Rotating the tube therefore makes it possible to effectively clean its exterior surface 11 and quickly evacuate the debris.
  • the exterior surface 11 of the tube could comprise at least one helix making it possible to convey the cuttings towards the proximal end 10a of the tube and therefore towards the exterior of the tube, to facilitate its evacuation.
  • a step of injecting a washing fluid is also carried out around the tube 10.
  • the washing fluid may comprise an aqueous solution and cleaning agents.
  • the washing fluid is introduced into the tube, at its proximal end 10a, via the orifice provided in the fixed 22 and pivoting 24 parts of the injection head 20.
  • the injection head 20 therefore allows inject the washing fluid into the tube 10.
  • the tube is then used as a conduit, so that the washing fluid flows between the injection channel 32 and the tube 10.
  • the washing fluid is brought up to at the distal end 10b of the tube where it is injected into the borehole F.
  • the pivoting part 24 of the injection head 20 is also rotated.
  • the washing fluid then gradually fills the upper part of the borehole located above the first sealing element and infiltrates between the exterior surface 11 of the tube 10 and the side wall Fb of the borehole.
  • the cuttings, including the injection fluid, present in this upper part of the drilling then mix with the washing fluid, so that the washing fluid carries the cuttings towards the upper end of the drilling and flushes them out of the drilling. This step makes it possible to evacuate the debris and clean the exterior surface 11 of the tube 10 more effectively.
  • the coupled action of the washing fluid and the rotation of the tube makes it possible to detach the debris even more effectively in contact with the tube.
  • Rotating the tube together with the injection of the washing fluid therefore allows very effective cleaning of the exterior surface 11 of the tube 10, significantly reducing the risk of blockage of the tube 10 in the borehole F.
  • the injection head 20 and the movement device 18 form a device for cleaning the tube 10 and therefore a device for evacuating the debris located between the tube 10 and the side wall Fb of the borehole F.
  • the injection fluid has propagated into the first portion of soil Z1, from the injection zone, so that this first portion of Z1 soil has been treated.
  • the dimensions of the first portion of soil Z1 treated depend in particular on the injection time and the quantity of injection fluid injected.
  • THE figures 7 to 10 illustrate the treatment of the second portion of soil Z2 distinct from the first portion of treated soil Z1 .
  • the second portion of soil Z2 to be treated extends between the first portion of unstable soil S1 and the second portion of unstable soil S2.
  • the tube 10 is moved towards the top of the borehole F and positioned at a first predetermined secondary depth P1' less than the first predetermined depth P1.
  • the tube 10 is then located opposite the second part of unstable ground S2 and makes it possible to maintain the side wall Fb of the borehole F at the level of this second part of unstable ground S2.
  • the first shutter element 30 is deflated and placed in the retracted position. It is then moved up the borehole F to a second secondary predetermined depth P2' less than the second predetermined depth P2.
  • the first shutter element 30 is inflated so as to be placed in the deployed position in which it matches the side wall Fb of the borehole.
  • the first shutter element then defines a secondary injection zone 34' located between the first shutter element 30, the bottom Fa of the borehole F and the side wall Fb of the borehole.
  • the secondary injection zone 34' is arranged in particular facing the second portion of soil Z2 to be treated, as can be seen in Figure 9 .
  • the injection channel 32 and the injection nozzle 36 are also raised in the borehole, facing the second portion of soil Z2 to be treated.
  • the injection fluid is injected into the secondary injection zone 34' so as to treat the second portion of soil Z2.
  • the tube is cleaned and the cuttings located between the tube 10 and the side wall Fb of the borehole F are removed.
  • the tube 10 is rotated using the displacement device 18 and a washing fluid is injected into the borehole F and around the tube 10 using the injection head 20. There- again, the circulation of the washing fluid prevents the cuttings, including the injection fluid, from blocking the tube in the drilling.
  • the injection fluid has infiltrated into the soil S so that the first portion of soil Z1 and the second portion of soil Z2 are treated.
  • a second shutter element 31 into the drilling at a third predetermined depth P3 between the second secondary predetermined depth P2' and the drilling depth Pf.
  • the second shutter element 31 is then located between the first sealing element 30 and the bottom of the borehole Fa.
  • the second shutter element 31 is similar to the first shutter element 30 and can also be placed in an deployed position. It therefore makes it possible to reduce the secondary injection zone 34', so that said secondary injection zone 34' therefore extends between the first closing element 30, the second closing element 31 and the wall. lateral Fb of the drilling. An advantage is not to project the injection fluid towards the bottom Fa of the drilling and therefore to locate the injection more precisely.
  • the second shutter element 31 may have been introduced at the same time as the first shutter element 30 or after.
  • the treatment of the first and second portions of soil Z1, Z2 was therefore carried out by going back, in two successive injection stages, towards the top of drilling F.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (17)

  1. Verfahren zur Bodenbehandlung (S), umfassend die folgenden Schritte:
    Bereitstellen eines Rohrs (10) mit einem distalen Ende (10b),
    Durchführen einer Bohrung (F) in dem Boden, wobei die Bohrung eine Bodenseite (Fa), eine Seitenwand (Fb), eine Bohrtiefe (Pf) aufweist und sich in einer Bohrrichtung (Y) erstreckt,
    Positionieren des Rohrs in der Bohrung in einer ersten vorbestimmten Tiefe (P1), die geringer als die Bohrtiefe ist,
    Einführen von mindestens einem ersten Verschlusselement (30) in die Bohrung in einer zweiten vorbestimmten Tiefe (P2) zwischen der ersten vorbestimmten Tiefe und der Bohrtiefe, sodass es sich zwischen dem distalen Ende des Rohrs und der Bodenseite der Bohrung erstreckt, wobei das mindestens eine erste Verschlusselement dazu ausgestaltet ist, die Bohrung zu verschließen, um eine Einspritzzone (34) zu definieren, die sich zwischen dem mindestens einen ersten Verschlusselement, der Bodenseite der Bohrung und der Seitenwand der Bohrung befindet,
    wobei das Verfahren zur Bodenbehandlung dadurch gekennzeichnet ist, dass eine Einspritzflüssigkeit in die Einspritzzone eingespritzt wird, während ein Schritt des Entfernens des Bohrkleins, das sich zwischen dem Rohr und der Seitenwand der Bohrung befindet, durchgeführt wird, wobei der Schritt des Entfernens des Bohrkleins Reinigen der Außenfläche (11) des Rohrs (10) umfasst, wobei der Schritt des Reinigens der Außenfläche (11) des Rohrs (10) Einspritzen einer Waschflüssigkeit um das Rohr herum umfasst.
  2. Behandlungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Schritt des Reinigens der Außenfläche (11) des Rohrs (10) In-Drehung-Versetzen des Rohrs um die Bohrrichtung (Y) herum umfasst.
  3. Behandlungsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das distale Ende des Rohrs (10) ein Schneidelement (22) trägt und dass der Schritt des Bohrens des Bodens (S) mit Hilfe des Rohrs durchgeführt wird, das in dem Boden entlang der Bohrrichtung (Y) bis zu der Bohrtiefe (Pf) bewegt wird.
  4. Behandlungsverfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Durchmesser des Rohrs (10) im Wesentlichen gleich dem Durchmesser der Bohrung ist.
  5. Behandlungsverfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass ein Drehmomentsensor (19) vorgesehen ist, dass mit Hilfe des Drehmomentsensors ein Widerstandsdrehmoment gemessen wird, das auf das Rohr (10) ausgeübt wird, und dass durch das gemessene Widerstandsdrehmoment ein mögliches Vorhandensein von Bohrklein in Kontakt mit dem Rohr erfasst wird.
  6. Behandlungsverfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das mindestens eine erste Verschlusselement (30) eine zurückgezogene Position, in der es in der Bohrung (F) bewegt werden kann, und eine ausgefahrene Position aufweist, in der es mit der Seitenwand (Fb) der Bohrung zusammenwirkt, um die Bohrung zu verschließen, um die Einspritzzone (34) zu definieren.
  7. Behandlungsverfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Einführen des mindestens einen ersten Verschlusselements (30) in die Bohrung (F) Einführen des ersten Verschlusselements in zurückgezogener Position in das Rohr (10) und Bewegen des ersten Verschlusselements entlang des Rohrs bis zu der zweiten vorbestimmten Tiefe (P2) umfasst.
  8. Behandlungsverfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Einspritzen der Einspritzflüssigkeit mit Hilfe einer Einspritzvorrichtung durchgeführt wird, die einen Einspritzkanal umfasst, der sich in das Innere des Rohrs (10) erstreckt und in die Einspritzzone mündet.
  9. Behandlungsverfahren nach Anspruch 8, dadurch gekennzeichnet, dass der Einspritzkanal durch das mindestens eine erste Verschlusselement (30) verläuft.
  10. Behandlungsverfahren nach einem der Ansprüche 1 bis 9, wobei ein zweites Verschlusselement (31) in die Bohrung in einer dritten vorbestimmten Tiefe (P3) zwischen der zweiten vorbestimmten Tiefe (P2) und der Bohrtiefe (Pf) eingeführt wird, sodass es sich zwischen dem mindestens einen ersten Verschlusselement (30) und der Bodenseite (Fa) der Bohrung (F) befindet, wobei das zweite Verschlusselement dazu ausgestaltet ist, die Bohrung zu verschließen, sodass sich die Einspritzzone (34') zwischen dem ersten Verschlusselement (30), dem zweiten Verschlusselement und der Seitenwand (Fb) der Bohrung erstreckt.
  11. Behandlungsverfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Einspritzflüssigkeit aus einem Versiegelungsprodukt und einem aushärtbaren Schlamm, der dazu ausgestaltet ist, den Boden (S) zu verfestigen, ausgewählt ist.
  12. Behandlungsverfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Waschflüssigkeit eingespritzt wird, wenn ein Vorhandensein von Bohrklein in Kontakt mit dem Rohr (10) mit Hilfe des Drehmomentsensors (19) erfasst wird.
  13. Behandlungsverfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass die Waschflüssigkeit durch das distale Ende (10b) des Rohrs (10) eingespritzt wird.
  14. Behandlungsverfahren nach Anspruch 13, dadurch gekennzeichnet, dass der Schritt des Einspritzens einer Waschflüssigkeit mit Hilfe eines Einspritzkopfs (20) durchgeführt wird, der dazu ausgestaltet ist, die Waschflüssigkeit in das Rohr (10) einzuspritzen, wobei der Einspritzkopf einen festen Teil (22) und einen Schwenkteil (24) umfasst, wobei der Schwenkteil dazu ausgestaltet ist, mit dem Rohr (10) zusammenzuwirken.
  15. Vorrichtung zur Bodenbehandlung (S), in der eine Bohrung (F) mit einer Bodenseite (Fa), einer Seitenwand (Fb), einer Bohrtiefe (Pf) durchgeführt wird und die sich entlang einer Bohrrichtung (Y) erstreckt,
    wobei die Behandlungsvorrichtung umfasst:
    ein Rohr (10) mit einem distalen Ende (10b), wobei das Rohr dazu ausgestaltet ist, in der Bohrung in einer ersten vorbestimmten Tiefe (P1), die geringer als die Bohrtiefe ist, positioniert zu werden,
    mindestens ein erstes Verschlusselement (30), das dazu ausgestaltet ist, in die Bohrung in einer zweiten vorbestimmten Tiefe (P2) zwischen der ersten vorbestimmten Tiefe und der Bohrtiefe eingeführt zu werden, wobei das mindestens eine erste Verschlusselement dazu ausgestaltet ist, die Bohrung zu verschließen, um eine Einspritzzone (34) definieren, die sich zwischen dem mindestens einen ersten Verschlusselement, der Bodenseite der Bohrung und der Seitenwand der Bohrung befindet,
    eine Einspritzvorrichtung (32, 36), die dazu ausgestaltet ist, eine Einspritzflüssigkeit in die Bohrung einzuspritzen,
    wobei die Vorrichtung zur Bodenbehandlung dadurch gekennzeichnet ist, dass sie umfasst
    eine Bohrkleinentfernungsvorrichtung (18, 20), die dazu ausgestaltet ist, das Bohrklein, das sich zwischen dem Rohr und der Seitenwand der Bohrung befindet, während des Einspritzens der Einspritzflüssigkeit in die Bohrung durch Reinigen der Außenfläche (11) des Rohrs (10), indem eine Waschflüssigkeit um das Rohr herum eingespritzt wird, zu entfernen.
  16. Behandlungsvorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass die Bohrkleinentfernungsvorrichtung eine Bewegungsvorrichtung (18) umfasst, die dazu ausgestaltet ist, das Rohr (10) um die Bohrrichtung (Y) herum in Drehung zu versetzen.
  17. Behandlungsvorrichtung nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass die Bohrkleinentfernungsvorrichtung einen Einspritzkopf (20) umfasst, um eine Waschflüssigkeit um das Rohr (10) herum einzuspritzen.
EP19835686.7A 2018-11-27 2019-11-04 Verfahren zur bodenbehandlung Active EP3887603B1 (de)

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FR3088942A1 (fr) 2020-05-29
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WO2020109682A1 (fr) 2020-06-04
US20220025603A1 (en) 2022-01-27
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