• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a soil displacement drill for on-site formation of a foundation pile, comprising an elongated hollow tube with a drill bit coupled to a free end of the tube at least during the insertion of the soil displacement drill, the soil displacement drill further comprises an outer casing having a length and an outer surface, the outer casing being provided on the outer surface over at least a portion of its length with an Archimedes screw, and wherein the soil displacement drill is further provided with coupling means for temporarily coupling the outer casing to the tube, so that the outer jacket can be carried through the tube into the ground in at least one drilling direction of rotation about a longitudinal axis of the tube and in at least one translation direction downwards parallel to the longitudinal axis of the tube.
    公开号:BE1021428B1
    申请号:E2013/0814
    申请日:2013-12-04
    公开日:2015-11-19
    发明作者:
    申请人:Beheersmaatschappij Verstraeten B.V.；DUPONT, Erwin Jean Simonne；VERPLANKE, Cornelis Mattheus；
    IPC主号:
    专利说明:

    Short indication: A soil displacement drill and method for forming a foundation pile on site
    The invention relates to a soil displacement drill for forming a foundation pile on site. The invention further relates to a method for forming a foundation pile on site in which use is made of a soil displacement drill.
    Such a soil displacement drill and method are known from patent publication DE2936060A1. DE2936060A1 discloses a soil displacement drill with an elongated hollow tube with a drill bit which is coupled to a free end of the tube at least during the introduction of the soil displacement drill. The soil displacement drill is generally screwed into the soil by a combination of a force exerted axially on the tube and a torque applied to the tube, the drill bit pushing the soil substantially sideways and thereby compacting it. This creates a cavity that can be filled with concrete or a concrete-like material to form a foundation pile. A major advantage of a soil displacement drill is that the foundation pile is placed in the soil without the introduction of violent vibrations into the soil, such as is customary when piling the foundation pile or driving a formwork into the soil to form the foundation pile on site.
    To prevent vibrations in the ground when placing the foundation pile or its formwork, there are also essentially other techniques available, namely those in which the cavity for the foundation pile is formed by soil removal by means of a screw from Archimedes, as shown for example in patent publication NL1036834C2. These techniques, however, have the important disadvantage that the foundation pile formed will sag upon first loading until the soil provides sufficient counter-pressure to absorb the load. With foundation piles that are formed with soil displacement drills, this disadvantage practically does not occur and the foundation pile can be loaded immediately without first sinking.
    For clarification, it is again noted that a soil displacement drill is characterized by the fact that a significant part of the cavity that is created is created by pushing soil away substantially sideways, thereby compacting the soil around the cavity. A drill in which the soil around the cavity is substantially compacted by vertical displacement of soil, for example with the aid of opposing screws, instead of lateral displacement by a drill head is therefore not, for example, a soil displacement drill.
    A disadvantage of a soil displacement drill is that the soil around the foundation pile to be formed can be pushed up and thereby affect the position of structures in or on the soil. For example, pushing the soil sideways away through the soil displacement drill can cause nearby basements or foundation piles to be pushed up or the position of structures on the surface, such as rails, to be affected.
    Another disadvantage of a soil displacement drill is that no variation in the diameter of the foundation pile to be formed is possible. As a result, often significant parts of the foundation pile are over-dimensioned for the loads that these parts must be able to bear / withstand.
    It is an object of the invention to eliminate or at least reduce one or more of the aforementioned disadvantages.
    To this end, the invention provides a soil displacement drill according to the preamble of claim 1, characterized in that the soil displacement drill further comprises an outer casing with a length and an outer surface, the outer casing being provided with a screw on the outer surface over at least a part of its length of Archimedes, and that the soil displacement drill is provided with coupling means for temporarily coupling the outer casing to the tube, so that the outer casing in at least one direction of rotation around a longitudinal axis of the tube and in at least one translation direction downwards parallel to the longitudinal axis of the tube can be taken through the tube into the ground.
    An advantage of the soil displacement drill according to the invention is that a choice can be made between forming a cavity through soil displacement or forming a cavity through soil removal. The choice is expressed in whether or not the outer casing is coupled to the tube. When the outer casing is coupled to the tube, the soil can be removed with the aid of the screw of Archimedes on the outer casing by transporting it in the direction of the ground surface. When the outer casing is not coupled to the pipe, the pipe with drill head can be driven into the ground independently of the outer casing. By now forming a first, upper, portion of the cavity for the foundation pile to be formed with an outer sheath coupled to the tube and forming a second, lower, portion of the cavity for the foundation pile to be formed with an uncoupled outer sheath, the advantages of a soil displacement drill can be combined with that of soil removal.
    By applying soil removal in the first part, it is prevented that the soil around the soil displacement drill is pushed up or at least the backlog is reduced as a result of the soil displacement. The ground that is deliberately pushed up is the ground at the location of the soil displacement drill that is transported to the ground surface by the screw from Archimedes. As a result, the position of nearby structures in or on the ground, such as basements, foundations, rails, etc., is not or hardly negatively influenced.
    By not applying soil removal, but only soil displacement in the second part of the cavity, the advantage of a well-bearing foundation pile that is characteristic of foundation piles formed with traditional soil displacement drills is obtained.
    Another advantage is that the use of the outer casing allows variation in the diameter of the foundation pile. Namely, by using the outer casing, a foundation pile can be obtained with a larger diameter in the first section than in the second section. The larger diameter of the first section can be advantageous for absorbing bending moments in the foundation pile. In the second part the bending moments occurring are generally smaller and the required diameter of the foundation pile can therefore also be smaller. In traditional systems, the larger diameter of the first portion required for absorbing the bending moments occurring there is also automatically applied in the second portion, while this larger diameter is not necessarily necessary for absorbing the occurring loads in the second portion. In traditional systems, therefore, more material is used than necessary, resulting in higher costs compared to the soil displacement drill according to the invention. A further advantage of the smaller diameter in the second part relative to the larger diameter in the first part is that a cavity with a smaller diameter can be formed faster with less force and thus for example less fuel consumption. In total, therefore, the foundation pile formed with the soil displacement drill according to the invention is economically more advantageous.
    In one embodiment, the outer casing is provided with a screw from Archimedes at least on the drill bit side, so that the screw from Archimedes can immediately become active when the outer casing is driven into the ground. The outer casing is preferably coupled to the tube in such a way that the outer casing is positioned directly above the drill bit, so that the outer casing is driven into the ground as quickly as possible after the drill bit. In this way it is prevented that in the first part such a soil displacement takes place before the outer casing becomes operative that still significant soil accumulation occurs around the soil displacement drill.
    In one embodiment, the outer casing has a screw diameter and the drill bit has a drill diameter, the screw diameter being the outer diameter of the screw of Archimedes, the tube diameter of the outer casing being smaller than or equal to the drill diameter of the drill bit, and the screw diameter being larger then the drill diameter of the drill bit.
    In one embodiment, the outer sheath has a tube diameter, the tube diameter being defined by the outer surface of the outer sheath, and wherein the tube diameter of the outer sheath is less than or equal to the drill diameter of the drill bit. An advantage of this embodiment is that the amount of soil or contamination that comes between the outer jacket and the pipe in the coupled state is minimal.
    In one embodiment, the length of the outer jacket is smaller than the length of the tube. As a result, there is sufficient room to turn the pipe further into the ground after the outer casing has been disconnected from the pipe without the outer casing getting in the way of a machine that turns the pipe into the ground. The length of the outer casing is preferably chosen such that after the outer casing has been taken to the desired depth, it still projects just above the ground surface.
    In one embodiment the coupling means comprise at least one first coupling element which is arranged on an outside of the tube and at least one second coupling element which extends or is arranged on an inside of the outer casing, wherein the at least one first coupling element and the at least one one second coupling element are adapted to cooperate with each other to temporarily connect the outer jacket to the tube.
    Preferably, the first or the second coupling element is designed as a protrusion and the other coupling element comprises an abutment surface against which the protrusion abuts during coupling of the outer casing to the tube, the protrusion and the abutment surface being designed such that both an axial force downwards when a torque corresponding to the drilling direction can be transferred from the tube to the outer casing.
    This makes it easy to connect and disconnect by respectively bringing the protrusion into contact with the abutment surface and removing the protrusion from the abutment surface. Furthermore, no moving parts are needed to connect and disconnect, so that no soil or dirt can get into those moving parts, which has a negative effect on their function.
    In one embodiment, the first coupling element is a pin and the second coupling element is a protruding part or a recess on which or in which the abutment surface is formed.
    A plurality of cooperating first and second coupling elements are preferably arranged around the soil displacement drill.
    In one embodiment, the coupling means are adapted to disengage the outer casing from the tube by rotating the tube relative to the outer casing in a direction of rotation that is opposite to the drilling rotation direction. This allows easy disconnection in the ground by making use of the ground resistance that will resist movement of the outer jacket. By actively rotating the tube in a direction opposite to the drilling direction, the tube will rotate and disconnect relative to the outer jacket. Separate actuation means for disconnection are then not required.
    In one embodiment, the drill bit-side end of the tube is provided with a thickening, wherein the first or second coupling element arranged on the inside of the outer casing is movable between an assembly position in which said first or second coupling element can pass the thickening, and an operative position in which said first or second coupling element cannot pass through the thickening. This makes it possible, with the thickening, to prevent the tube jacket from falling off the tube, but it is also retained the possibility of removing the tube jacket from the tube, for example for maintenance or replacement of the tube jacket or tube.
    In one embodiment, the drill bit is detachable from the tube to be left in the ground. This allows the tube to be easily withdrawn while the cavity is already filled with concrete or concrete-like material so that it can eventually be re-used somewhere else. However, it is equally possible to leave the tube behind or to withdraw the drill bit and then fill the cavity with concrete or concrete-like material.
    The drill bit can be any drill bit known from the prior art, wherein the drill bit can be adapted to the soil type and / or the drilling method, for example a dry drilling method or an injection drilling method. The drill bit can have any shape, but usually has a substantially pointed shape. Furthermore, the drill bit can be provided with protrusions or blades for loosening the soil or moving the soil sideways.
    In order to guide the movement of the outer casing and the tube relative to each other and / or to prevent the outer casing and the tube from becoming skewed relative to each other, the soil displacement drill can be provided with one or more guide elements which are active between the outer jacket and the tube.
    The invention also relates to a method for forming a foundation pile on site, comprising turning a soil displacement drill into the ground in two phases, namely a first phase and a second phase which take place one after the other, starting with the first phase in which at the same time soil around a soil displacing element is removed from the soil displacement drill, and wherein in the second phase only the soil displacing element is further turned into the soil.
    An advantage of this method is that a cavity for a foundation pile to be formed is formed with a first, upper part that is formed in the first phase and has the advantage that little to no soil impoundment takes place due to soil displacement and with a second, lower , part formed in the second phase and having the advantage that the foundation pile has a good bearing capacity that is characteristic of foundation piles formed by soil displacement.
    Another advantage is that the diameter of the first part can be larger than the diameter of the second part, so that the diameters used can better match the occurring loads in the first and second part, whereby in general the diameter of the first part portion will be larger than the diameter of the second portion to properly accommodate bending moments in the first portion. As a result, the material used is used effectively and an economically more favorable foundation pile is created.
    A larger diameter in the first part of the foundation pile can also be used advantageously in the transition from the foundation pile to a structure resting on the foundation pile, wherein the occurring stresses in the foundation pile and the structure resting on it can be more evenly distributed or below a certain maximum can be kept.
    In one embodiment use is made of a soil displacement drill according to the invention, wherein in the first phase the outer casing is coupled to the pipe and is turned into the soil together with the pipe and the drill head, whereby the first casing is uncoupled in the outer casing from the tube, and wherein in the second phase the drill bit with the tube as soil displacing element is further turned into the ground while the outer casing remains behind. An advantage is that it is easy to switch between the first and second phase while using the same soil displacement drill.
    In one embodiment, after the second phase, the drill bit is disconnected from the tube and the tube is removed from the ground by withdrawal. This allows the pipe to be used again somewhere else to form a foundation pile.
    In one embodiment, the outer casing is removed from the ground by being pulled along by the receding tube. As a result, no separate means are required to remove the outer jacket from the ground. For this purpose, the tube can for instance be provided with a bulge along which the outer casing cannot pass, so that the bulge pulls the outer casing along.
    In one embodiment, before the tube is withdrawn, reinforcement is provided in the tube and the tube is then filled with concrete or concrete-like material.
    In one embodiment, after removal of the outer casing from the ground, reinforcement is provided in the part of the cavity in the ground created by the outer casing. This increases the resistance to bending moments and makes optimum use of the larger diameter. This reinforcement can be placed around the reinforcement arranged in the tube.
    The invention will hereinafter be described in non-limitative terms with reference to the figures, in which like or similar parts are indicated by like reference symbols, and in which:
    FIG. 1 shows a schematic section of a soil displacement drill according to an embodiment of the invention;
    FIG. 2 shows in detail a part of a tube of the soil displacement drill according to FIG. 1; and
    FIG. 3 in 11 steps, namely (a) to (k), shows a method according to an embodiment of the invention.
    Figure 1 shows a schematic section of a soil displacement drill 1 according to an embodiment of the invention. The soil displacement drill 1 is suitable for forming a foundation pile on site and for this purpose comprises an elongated hollow tube 3 with a drill bit 5 which is coupled at least during the introduction of the soil displacement drill 1 to a free end 7 of the tube by coupling 8. The length of the tube 3 is indicated by L2.
    The soil displacement drill 1 further comprises an outer casing 9 with a length L1 and an outer surface 11, the outer casing on the outer surface 11 being provided with a screw of Archimedes 13 over at least a part of its length L1, in this case a lower part. The length of the part where the Archimedes screw is placed determines how much soil removal can be achieved with the outer casing and therefore how much soil accumulation can be prevented. In highly critical areas such as, for example, around rails, the outer casing may, if desired, be provided with an Archimedes screw along its entire length L1.
    The length L1 of the outer jacket is preferably smaller than the length L2 of the tube. The length L1 is, for example, 0.2 - 0.5 times length L2, preferably 1/3 times length L2.
    The soil displacement drill 1 further comprises coupling means 15, 17 for temporarily coupling the outer casing 9 to the pipe. The coupling means will be described in more detail below with reference to Figs. 1 and FIG. 2 are described.
    FIG. 2 shows the tube 3 of the soil displacement drill 1 of FIG. 1. The coupling means comprise a first coupling element 17 arranged on the outside of the tube 3. The coupling means furthermore comprise a second coupling element 15, in the form of a pin extending from the inside of the outer casing towards the tube 3 and thus a protrusion is. The first coupling element 17 extends from the tube 3 towards the outer casing 9 and has an abutment surface 19 against which the second coupling element 15, i.e. the pin, can abut as shown in FIG. 2 in which the pin 15 is shown in broken lines to indicate how the pin interacts with the first coupling element.
    The first coupling element 17, as it were, hooks around the pin 15 and, when the tube 3 rotates in a drilling direction 21 around a longitudinal axis 25 of the tube 3, takes along the pin 15 and thus the outer casing 9. The same happens when the tube 3 is moved downwards in translation direction 23. By the coupling means it is thus possible to temporarily move the outer casing along with the tube in at least the drilling rotation direction 21 around the longitudinal axis 25 of the tube 3 and in at least the translation direction 23 downwards parallel to the longitudinal axis 25 of the tube 3.
    Disconnection of the outer casing and tube is easily accomplished by turning the tube 3 opposite to the drilling rotation direction 21 relative to the outer casing. When the outer jacket is arranged in the ground, it will not move with the ground due to resistance and the contact between pin 15 and first coupling element 17 will be broken. Thereafter, the tube 3 can then move in translation direction 23 relative to the outer jacket 9. When the first coupling element 17 has been moved past the pin 15, rotation can again be made in the drilling direction of rotation without again a coupling between the outer jacket and the tube being created.
    The tube 3 further comprises an actuation part 27 which can be coupled to a machine adapted to apply an axial force parallel to the longitudinal axis of the tube and / or a torque about the longitudinal axis of the tube to the tube for in and out bringing the soil from the soil displacement drill.
    In this embodiment the tube 3 comprises a thickening 29 at the free end 7. The thickening can, in addition to other functions, have the function of preventing the outer casing from falling off the tube, because the second coupling element, ie the pin 15, thickening cannot pass. In this embodiment, the bulge 29 and the first coupling element 17 are positioned relative to each other such that a relative rotation of the tube with respect to the outer jacket simply couples the outer jacket to the tube or disconnects from the tube. The advantage is that no moving coupling elements are required for this. The thickening can also be used to raise the outer casing together with the tube 3, i.e. to withdraw from the ground.
    In order to be able to remove the outer casing from the tube for, for example, maintenance or replacement, the coupling element on the outer casing, in this case the pin 15, is preferably movable between an assembly position in which the pin 15 can pass through the thickening, and an effective position in which the pin 15 cannot pass through the thickening. For example, the pin can be received in a sleeve mounted on or in the outer jacket and can be taken out to move the outer jacket over the bulge. By fixing the position of the pin in the operative position during use, a safe, yet flexible design is obtained.
    In FIG. 1 and 2, one first and one second coupling element are shown, but it will be clear to the skilled person that a plurality of cooperating first and second coupling elements can be placed around the tube 3, it being preferred that the different pairs of first and second coupling elements can connect and disconnect simultaneously.
    The outer sheath has a tube diameter D1 defined by the outer surface 11 of the outer sheath 9, and a screw diameter D2 defined by the outside of the Archimedes screw. The drill bit 5 has a drill diameter D3, which is defined by the maximum diameter where the soil is pushed sideways. In this embodiment, the tube diameter D1 of the tube casing 9 is smaller or equal to the drill diameter D3 of the drill bit 5, and the screw diameter D2 of the outer casing 9 is larger than the drill diameter D3 of the drill bit 5.
    FIG. 1 furthermore shows guide elements 28 which are operative between the outer casing 9 and the tube 3 for guiding the movement of the outer casing relative to the tube. The guide elements can also have a centering function to prevent the outer jacket from tilting with respect to the tube. The guide elements are preferably fixed to the outer jacket.
    FIG. 3 shows in 11 images / steps a method according to an embodiment of the invention in which a soil displacement drill 1 according to another embodiment of the invention is used. The 11 images are represented with the symbols (a) to (k). The reference symbols are not included in all images so as not to cloud the drawings too much.
    In (a), a soil displacement drill 1 is about to be driven into the soil G. Of the soil displacement drill 1, only the pipe 3, outer jacket 9 with screw from Archimedes 13 and drill chuck 5 are shown. The construction is similar to that of the soil displacement drill from Figs. 1 and 2. It is worth noting the fact that the screw of Archimedes 13 in this embodiment is only placed on the drill bit side of the outer casing and not over the entire length of the outer casing. Furthermore, in (a) the outer casing 9 is coupled to the tube 3 so that a rotation of the tube in a drilling direction 21 as shown in (b) and a translation of the tube in a translation direction 23 can be transferred downwards to the outer casing such that it moves with the tube 3 into the ground.
    The speed of the soil displacement drill in the translation direction is preferably adjusted to the rotational speed in the drilling direction so that the screw of Archimedes transports soil to the soil surface when penetrating into the soil as can be seen from the piles of soil Ga, Gb on either side of the soil displacement drill in image (b) and beyond. In (b) the first phase of forming a cavity is ready and the outer casing is carried into the ground to a desired depth. Due to the screw of Archimedes, only soil at the location of the soil displacement drill is transported to the surface, as a result of which little to no soil accumulation occurs due to soil displacement.
    In (c), the outer casing is disconnected from the tube by rotating the tube in the opposite direction to the drilling direction 21 as shown in (c) by arrow 31. As a result, the coupling means as also discussed in relation to FIG. 1 and 2 and by subsequently only translating the tube in translation direction 23, re-coupling is prevented because the coupling means are no longer aligned with each other.
    After this, the second phase of forming the cavity can be started, in which the tube is again moved in the direction of drilling rotation 21 and in the translation direction 23 and is driven further into the ground beyond the outer casing.
    In (e) the pipe with drill head has arrived at the desired depth and the second phase has come to an end. The cavity is then fully formed and the process of forming the foundation pile can begin. In this embodiment, this starts with placing a first reinforcement 35 in the tube 3 as shown in (e). The tube 3 is then filled with concrete or a concrete-like material B as shown in (f).
    In (g) the tube 3 is disconnected from the drill bit 5 which remains and the tube 3 is withdrawn in the direction 33, optionally screwing or oscillating. In (h) the bulge 29 (see image (e)) of the tube 3 has reached the outer casing, after which the outer casing is pulled out of the ground together with the tube 3. This is preferably done by turning the tube and thus the outer casing in the direction of the drilling rotation or by not turning at all and pulling so-called cold. This causes soil Gc to be pulled upwards around the outer casing, see (i), and a cavity is created along the length of the outer casing in the ground that has a diameter that is larger than the cavity formed by the pipe and drill bit alone. By withdrawing the outer casing, the cavity that remains behind is also filled with concrete or concrete-like material from the tube 3.
    In (j) a second reinforcement 37 is placed over the reinforcement 35, which ensures that the first, upper part is resistant to bending moments. The final foundation pile formed can be seen in (k).
    The embodiments described above and shown in the figures relate to so-called normal drilling, whereby the soil displacement drill is driven "dry" into the soil. However, it is also possible to apply the invention to so-called injection drills, wherein, for example, a grout mixture or water can be injected through the drill bit into the cavity and provides lubrication during drilling.
    权利要求:
    Claims (15)
    [1]
    CONCLUSIONS
    CLAIMS 1. A soil displacement drill for forming a foundation pile on site, comprising an elongated hollow tube with a drill bit which is coupled to a free end of the tube at least during the introduction of the soil displacement drill, characterized in that the soil displacement drill further comprises an outer casing with a length and an outer surface, wherein the outer casing on the outer surface is provided with an Archimedes screw over at least a part of its length, and that the soil displacement drill is provided with coupling means for temporarily coupling the outer casing to the tube, so that the outer casing can be carried into the ground in at least one direction of rotation around a longitudinal axis of the tube and in at least one translation direction downwards parallel to the longitudinal axis of the tube.
    [2]
    A soil displacement drill according to claim 1, wherein the outer casing is provided with an Archimedes screw at least on the drill bit side.
    [3]
    A soil displacement drill as claimed in claim 1 or 2, wherein the outer casing has a tube diameter and a screw diameter, the tube diameter being defined by the outer surface of the outer casing, and the screw diameter being the outer diameter of the Archimedes screw, the drill bit having a drill diameter, wherein the tube diameter of the outer casing is smaller or equal to the drill diameter of the drill bit, and wherein the screw diameter is larger than the drill diameter of the drill bit.
    [4]
    A soil displacement drill as claimed in one or more of the preceding claims, wherein the length of the outer casing is smaller than the length of the pipe.
    [5]
    A soil displacement drill as claimed in one or more of the foregoing claims, wherein the coupling means comprise at least one first coupling element which is arranged on an outside of the pipe and at least one second coupling element which extends or is arranged on the inside of the outer casing, wherein the at least one first coupling element and the at least one second coupling element are adapted to cooperate with each other to temporarily connect the outer jacket to the tube.
    [6]
    A soil displacement drill as claimed in claim 5, wherein the first or the second coupling element is designed as a protrusion and the other coupling element comprises an abutment surface against which the protrusion abuts during coupling of the outer casing to the tube, the protrusion and the abutment surface being shaped in such a way that both an axial force downwards and a torque corresponding to the drilling direction can be transmitted from the tube to the outer casing.
    [7]
    A soil displacement drill as claimed in one or more of the foregoing claims, wherein the coupling means are adapted to uncouple the outer casing from the tube by rotating the tube relative to the outer casing in a direction of rotation that is opposite to the drilling direction of rotation.
    [8]
    A soil displacement drill as claimed in claim 5, wherein the drill end side of the pipe is provided with a thickening and wherein the first or second coupling element arranged on the inside of the outer casing is movable between an assembly position, in which said first or second coupling element the thickening can pass, and an operative position, wherein said first or second coupling element cannot pass the thickening.
    [9]
    A soil displacement drill as claimed in one or more of the preceding claims, wherein the drill bit is detachable from the pipe so that it can be left in the soil.
    [10]
    A method for forming a foundation pile on site, comprising of turning a soil displacement drill into the soil in two phases, namely a first phase and a second phase that take place one after the other, starting with the first phase in which at the same time soil around a soil displacing element is removed from the soil displacement drill, and in the second phase only the soil displacing element is further turned into the soil.
    [11]
    A method according to claim 10, wherein use is made of a soil displacement drill according to one or more of claims 1 to 9, and wherein in the first phase the outer casing is coupled to the tube and together with the tube and the drill bit the is turned into soil, with the pipe being uncoupled between the first and second phase in the outer casing, and wherein in the second phase the drill bit with the pipe as soil displacing element is further turned into the soil while the outer casing remains behind.
    [12]
    A method according to claim 11, wherein after the second phase the drill bit is disconnected from the tube and the tube is removed from the ground by withdrawal.
    [13]
    A method according to claim 12, wherein the outer casing is removed from the ground by being pulled along by the receding tube.
    [14]
    A method according to claim 12, wherein before the tube is withdrawn, reinforcement is applied to the tube and then the tube is filled with concrete or concrete-like material.
    [15]
    A method according to claim 13, wherein after removal of the outer casing from the ground, reinforcement is provided in the space obtained by the outer casing.
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    同族专利:
    公开号 | 公开日
    NL1039935C2|2014-06-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US8152415B2|2000-06-15|2012-04-10|Geopier Foundation Company, Inc.|Method and apparatus for building support piers from one or more successive lifts formed in a soil matrix|
    JP4445033B1|2008-09-09|2010-04-07|国立大学法人三重大学|Attachment for forming crushed stone pile and crushed stone pile forming apparatus provided with the attachment|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NL1039935A|NL1039935C2|2012-12-07|2012-12-07|A GROUND-DISCHARGE DRILL AND METHOD FOR FORMING A FOUNDATION POLE ON THE SPOT.|
    NL1039935|2012-12-07|
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