EP0574057A1 - Method for the vibration-free construction of a soil displacing foundation pile - Google Patents
Method for the vibration-free construction of a soil displacing foundation pile Download PDFInfo
- Publication number
- EP0574057A1 EP0574057A1 EP93201383A EP93201383A EP0574057A1 EP 0574057 A1 EP0574057 A1 EP 0574057A1 EP 93201383 A EP93201383 A EP 93201383A EP 93201383 A EP93201383 A EP 93201383A EP 0574057 A1 EP0574057 A1 EP 0574057A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pile
- tube
- grout
- hollow tube
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
Definitions
- This invention relates to a method for the vibration-free construction of a soil displacing foundation pile, in which method a hollow tube, closed at the lower end thereof by a pile base and provided on the outside thereof with a helix, is screwed into the ground, an amount of self-hardening, liquid pile material is introduced into the hollow tube and a pile having a diameter smaller than the internal diameter of the tube is arranged in the hollow tube, whereafter the hollow tube is retracted from the ground, leaving the pile base behind.
- the object of the present invention is to provide a method by means of which a good soil displacing foundation pile can be constructed without vibration, without using swelling concrete as the self-hardening, liquid pile material.
- the object contemplated is realized, according to the invention, with a method of the type described in the preamble, in which, as pile material, grout is used and as a pile of smaller diameter, a prefabricated pile is used, which is introduced into the hollow tube approximately as far as the pile base, whilst the space between the pile and the tube is filled with grout and during the retraction of the tube from at least the part of the ground where positive adhesion is developed, the grout in the space mentioned is kept under pressure.
- a conventional self-hardening material such as grout
- a conventional self-hardening material such as grout
- the soil stress at the location of the pile to be formed will be disturbed relatively drastically, i.e., the stress of the soil will tend to decrease.
- the grout in the space between the hollow tube and the prefabricated pile is kept under high pressure as the hollow tube is being retracted from at least that part of the ground where positive adhesion is developed, any relaxation of the ground at the point where the hollow tube has been pulled out is prevented, so that the original soil stress over the path of positive adhesion is maintained as much as possible.
- the hollow tube may be rotated during retraction, but it is commonly pulled from the ground without being rotated. As a result, a "skin" or “peel” of adjacent soil is removed along with the tube. If, in accordance with the invention, the grout is kept under pressure during the retraction of the hollow tube, the grout will occupy the position of the skin of soil that has been pulled out along with the tube, with the result that the surrounding soil cannot relax. Even when the tube is retracted without rotation, an optimum bearing pile is constructed. If necessary, further grout can be supplied while the grout is being kept under pressure.
- a pressure of at least 8 bar is exerted on the grout.
- the prevention of relaxation of the surrounding soil cannot be guaranteed under all circumstances, certainly not if the tube is retracted without rotation.
- the tube is rotated, without being pulled, in a direction such that the soil located in the helix is forced from the helix in downward direction, while during such rotation the pressure on the grout in the tube is maintained.
- the soil is discharged from the helix in downward direction, so that the pressure on the soil surrounding the lowermost part of the pile to be formed is further increased.
- the hollow tube is screwed into the ground at so high a pressure that the tube, in one revolution, penetrates the ground over a length equal to the pitch of the helix. This occurs at a turning moment of about 25 ton/meter.
- Figs. 1-6 are schematic representations of a pile during different stages of the construction thereof, utilizing an embodiment of the method according to the invention.
- Fig. 1 shows a hollow tube 1 as it is being screwed into the ground or soil 2.
- the tube 1 is provided at the circumference thereof with a helical strip or collar 3 directed more or less perpendicularly to the surface of the tube.
- the tube 1 draws itself into the ground if the tube is rotated under some pressure, quite like a screw penetrating into a supporting surface under the pressure of a screwdriver.
- the lower end of the hollow tube 1 is closed by a pile base or pile tip 4.
- the pile base 4 is connected to the hollow tube 1 in such a manner that, upon removal of the hollow tube, the pile base 4 is left behind in the soil 2.
- Such a manner of connecting tube 1 and pile base 4 is known to those skilled in the art.
- Fig. 2 schematically shows that an amount of grout 5 has been introduced via a supply duct 6 from the top into the hollow tube 1 after it has been screwed into the soil 2 to the desired depth.
- the grout 5 fills the hollow tube 1 from the pile base 4 up to a suitable height, partly depending on the size of the prefabricated pile to be subsequently introduced into the tube. It is observed that, for the sake of clarity, Figs. 2-5 do not show the entire strip-shaped helix 3.
- Fig. 3 shows how, after the hollow tube 1 has been filled with grout 5 from the pile base 4 up to a certain height, a prefabricated, for instance concrete, pile 7 is lowered into the hollow tube 1, until the pile 7 rests on the pile base 4.
- the diameter of the prefabricated pile 7 is smaller than the internal diameter of the hollow tube 1, leaving a space 8 between pile 7 and tube 1.
- the condition wherein the pile 7 rests on the pile base 4 is shown in Fig. 4, where it is further shown that the entire space between the prefabricated pile 7 and the inside wall of the hollow tube 1 is filled with grout.
- the reinforcement bars 9 projecting from the pile 7 at the top thereof can serve as gripping elements for keeping the pile 7 in position as long as the grout 5 has not hardened yet.
- gripping elements of a different type can be used, for instance a screwed sleeve or an anchor incorporated into the pile head. It will be clear that the condition shown in Fig. 4 can also be achieved by first lowering the prefabricated pile 7 into the tube 1 and subsequently introducing grout 5 into the space 8 between pile 7 and tube 1. Further, it is not always required that the entire space 8 be filled with grout 5 up to the very top. This, of course, depends partly on the condition of the surrounding soil.
- Fig. 5 shows how, in accordance with the invention, the hollow tube 1 is subsequently retracted from the soil 2 over a part of its length, while simultaneously the grout 5 in the space 8 between the pile 7 and the hollow tube 1 is kept under a high pressure (for instance 8 bar or more).
- a high pressure for instance 8 bar or more.
- the retraction of the tube 1 is preferably discontinued for some time and subsequently the tube is rotated in the opposite screwing direction, so that the soil present in the helix 3 is discharged in downward direction and, partly as a result thereof, the grout 5 is kept under pressure.
- the retraction of the hollow tube 1 is resumed and completed, while the pressure on the grout is maintained.
- the final result is the condition shown in Fig. 6, where the prefabricated pile 7 resting on the pile base 4 is surrounded at the lower end thereof by a grout jacket 10 and, further upwards, by a jacket 11 of grout partly mixed with soil. After hardening, a foundation pile of eminent bearing capacity is obtained.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A method for the vibration-free production of a foundation pile, in which method a hollow tube (1), closed at the lower end thereof by a pile base (4) and provided on the outside thereof with a helix (3), is screwed into the ground, an amount of grout (5) is introduced into the hollow tube and a prefabricated pile (7) having a diameter smaller than the internal diameter of the tube is introduced into the hollow tube approximately as far as the pile base and the space between the pile and the tube (8) is filled entirely with grout, whereafter the hollow tube is retracted from the ground, leaving the pile base behind, while during the retraction of the tube from at least the part of the ground that exhibits positive adhesion, grout is pumped under pressure into said space.
Description
- This invention relates to a method for the vibration-free construction of a soil displacing foundation pile, in which method a hollow tube, closed at the lower end thereof by a pile base and provided on the outside thereof with a helix, is screwed into the ground, an amount of self-hardening, liquid pile material is introduced into the hollow tube and a pile having a diameter smaller than the internal diameter of the tube is arranged in the hollow tube, whereafter the hollow tube is retracted from the ground, leaving the pile base behind.
- Such a method is disclosed in Dutch patent application 88.02318. In the known method, as a self-hardening, liquid pile material, so-called swelling concrete is employed. In that specification it is not further explained what swelling concrete is. It can be inferred from the text, however, that it is a type of concrete which swells during hardening. This swelling appeared to have presented problems hitherto and in that document measures are proposed to remove those problems.
- The object of the present invention is to provide a method by means of which a good soil displacing foundation pile can be constructed without vibration, without using swelling concrete as the self-hardening, liquid pile material.
- The object contemplated is realized, according to the invention, with a method of the type described in the preamble, in which, as pile material, grout is used and as a pile of smaller diameter, a prefabricated pile is used, which is introduced into the hollow tube approximately as far as the pile base, whilst the space between the pile and the tube is filled with grout and during the retraction of the tube from at least the part of the ground where positive adhesion is developed, the grout in the space mentioned is kept under pressure.
- If a conventional self-hardening material, such as grout, is used for the construction of a foundation pile utilizing a hollow tube, which, prior to hardening, is retracted or unscrewed from the ground again, the soil stress at the location of the pile to be formed will be disturbed relatively drastically, i.e., the stress of the soil will tend to decrease. If, in accordance with the invention, the grout in the space between the hollow tube and the prefabricated pile is kept under high pressure as the hollow tube is being retracted from at least that part of the ground where positive adhesion is developed, any relaxation of the ground at the point where the hollow tube has been pulled out is prevented, so that the original soil stress over the path of positive adhesion is maintained as much as possible. As a result, the bearing capacity of the pile to be formed will be optimal. The hollow tube may be rotated during retraction, but it is commonly pulled from the ground without being rotated. As a result, a "skin" or "peel" of adjacent soil is removed along with the tube. If, in accordance with the invention, the grout is kept under pressure during the retraction of the hollow tube, the grout will occupy the position of the skin of soil that has been pulled out along with the tube, with the result that the surrounding soil cannot relax. Even when the tube is retracted without rotation, an optimum bearing pile is constructed. If necessary, further grout can be supplied while the grout is being kept under pressure.
- According to the invention, during the retraction of the tube from the part of the ground where positive adhesion is developed, preferably a pressure of at least 8 bar is exerted on the grout. At a lower pressure, the prevention of relaxation of the surrounding soil cannot be guaranteed under all circumstances, certainly not if the tube is retracted without rotation.
- In a preferred embodiment of the method according to the invention, after the hollow tube has been retracted over a part of the length thereof, the tube is rotated, without being pulled, in a direction such that the soil located in the helix is forced from the helix in downward direction, while during such rotation the pressure on the grout in the tube is maintained. By reversely rotating the hollow tube in stationary position in this manner at a given time, the soil is discharged from the helix in downward direction, so that the pressure on the soil surrounding the lowermost part of the pile to be formed is further increased. An additional advantage is that soil and grout are mixed at that point, so that a covering layer of good quality is formed around the pile.
- In accordance with a further preference, the hollow tube is screwed into the ground at so high a pressure that the tube, in one revolution, penetrates the ground over a length equal to the pitch of the helix. This occurs at a turning moment of about 25 ton/meter. The advantage of arranging for the tube to penetrate the ground over exactly one pitch in one revolution is that thereby practically no soil will be conveyed upwards, so that, again, the soil stress is left unchanged by the introduction of the hollow tube.
- The invention will be explained with reference to the drawings, in which:
- Figs. 1-6 are schematic representations of a pile during different stages of the construction thereof, utilizing an embodiment of the method according to the invention.
- In the drawings, similar or corresponding parts are indicated by the same reference numerals.
- Fig. 1 shows a
hollow tube 1 as it is being screwed into the ground orsoil 2. Thetube 1 is provided at the circumference thereof with a helical strip orcollar 3 directed more or less perpendicularly to the surface of the tube. By virtue of thehelix 3, thetube 1 draws itself into the ground if the tube is rotated under some pressure, quite like a screw penetrating into a supporting surface under the pressure of a screwdriver. The lower end of thehollow tube 1 is closed by a pile base orpile tip 4. Thepile base 4 is connected to thehollow tube 1 in such a manner that, upon removal of the hollow tube, thepile base 4 is left behind in thesoil 2. Such a manner of connectingtube 1 andpile base 4 is known to those skilled in the art. - Fig. 2 schematically shows that an amount of
grout 5 has been introduced via asupply duct 6 from the top into thehollow tube 1 after it has been screwed into thesoil 2 to the desired depth. Thegrout 5 fills thehollow tube 1 from thepile base 4 up to a suitable height, partly depending on the size of the prefabricated pile to be subsequently introduced into the tube. It is observed that, for the sake of clarity, Figs. 2-5 do not show the entire strip-shaped helix 3. - Fig. 3 shows how, after the
hollow tube 1 has been filled withgrout 5 from thepile base 4 up to a certain height, a prefabricated, for instance concrete,pile 7 is lowered into thehollow tube 1, until thepile 7 rests on thepile base 4. The diameter of theprefabricated pile 7 is smaller than the internal diameter of thehollow tube 1, leaving aspace 8 betweenpile 7 andtube 1. The condition wherein thepile 7 rests on thepile base 4 is shown in Fig. 4, where it is further shown that the entire space between theprefabricated pile 7 and the inside wall of thehollow tube 1 is filled with grout. Thereinforcement bars 9 projecting from thepile 7 at the top thereof can serve as gripping elements for keeping thepile 7 in position as long as thegrout 5 has not hardened yet. Instead ofreinforcement bars 9, gripping elements of a different type can be used, for instance a screwed sleeve or an anchor incorporated into the pile head. It will be clear that the condition shown in Fig. 4 can also be achieved by first lowering theprefabricated pile 7 into thetube 1 and subsequently introducinggrout 5 into thespace 8 betweenpile 7 andtube 1. Further, it is not always required that theentire space 8 be filled withgrout 5 up to the very top. This, of course, depends partly on the condition of the surrounding soil. - Fig. 5 shows how, in accordance with the invention, the
hollow tube 1 is subsequently retracted from thesoil 2 over a part of its length, while simultaneously thegrout 5 in thespace 8 between thepile 7 and thehollow tube 1 is kept under a high pressure (forinstance 8 bar or more). By keeping thegrout 5 under a high pressure, the space that threatens to be formed between theprefabricated pile 7 and the surroundingsoil 2 at the point where thehollow tube 1 has been retracted - due to the fact that a part of thesoil 2 disposed between the windings of thehelix 3 is removed along with the tube 1 - is filled entirely with grout, so that thespace 10 filled with grout cannot be filled up withsoil 2 which might otherwise be forced towards thepile 7. This prevents thesoil 2 from relaxing and the original stress profile of thesoil 2 is maintained or even improved. - When the
hollow tube 1 has been retracted to the extent where the lower end thereof is located at the upper limit of the layers of soil exhibiting positive adhesion, the retraction of thetube 1 is preferably discontinued for some time and subsequently the tube is rotated in the opposite screwing direction, so that the soil present in thehelix 3 is discharged in downward direction and, partly as a result thereof, thegrout 5 is kept under pressure. Finally, the retraction of thehollow tube 1 is resumed and completed, while the pressure on the grout is maintained. Thus, the final result is the condition shown in Fig. 6, where theprefabricated pile 7 resting on thepile base 4 is surrounded at the lower end thereof by agrout jacket 10 and, further upwards, by ajacket 11 of grout partly mixed with soil. After hardening, a foundation pile of eminent bearing capacity is obtained.
Claims (4)
- A method for the vibration-free construction of a soil displacing foundation pile, in which method a hollow tube, closed at the lower end thereof by a pile base and provided on the outside thereof with a helix, is screwed into the ground, an amount of self-hardening, liquid pile material is introduced into the hollow tube and a pile having a diameter smaller than the internal diameter of the tube is arranged in the hollow tube, whereafter the hollow tube is retracted from the ground, leaving the pile base behind, characterized in that, as pile material, grout is used and as a pile of smaller diameter, a prefabricated pile is used, which is introduced into the hollow tube approximately as far as the pile base, whilst the space between the pile and the tube is filled with grout and during the retraction of the tube from at least the part of the ground where positive adhesion is developed, the grout in said space is kept under pressure.
- A method according to claim 1, characterized in that during the retraction of the tube from the part of the ground where positive adhesion is developed, a pressure of at least 8 bar is exerted on the grout.
- A method according to claims 1-2, characterized in that, after the hollow tube has been retracted over a part of the length thereof, the tube is rotated, without being pulled, in a direction such that the soil located in the helix is forced from the helix in downward direction, while during such rotation the pressure on the grout in the tube is maintained.
- A method according to any one of claims 1-3, characterized in that the hollow tube is screwed into the ground at so high a pressure that in one revolution the tube penetrates the ground over a length exactly equal to the pitch of the helix.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9200855 | 1992-05-14 | ||
NL9200855A NL9200855A (en) | 1992-05-14 | 1992-05-14 | METHOD FOR THE VIBRATION-FREE MANUFACTURE OF A GROUND-REPLACING FOUNDATION POLE |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0574057A1 true EP0574057A1 (en) | 1993-12-15 |
Family
ID=19860798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93201383A Withdrawn EP0574057A1 (en) | 1992-05-14 | 1993-05-14 | Method for the vibration-free construction of a soil displacing foundation pile |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0574057A1 (en) |
NL (1) | NL9200855A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999011870A1 (en) * | 1997-09-04 | 1999-03-11 | Josef Möbius Bau-Gesellschaft (GmbH & Co.) | Method and sheathing for producing a ground column to support building or travelling loads |
EP1985765A1 (en) | 2007-04-25 | 2008-10-29 | Jean-Marie Renovation | Device and method for installing a helical foundation micro-pile |
CN101634145B (en) * | 2009-07-29 | 2011-12-28 | 中铁二院工程集团有限责任公司 | Anti-slide pile with vertical prestressed anchor cables |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1008750C2 (en) | 1998-03-30 | 1999-10-01 | Hollandsche Betongroep Nv | Method for manufacturing a foundation pile in the ground. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE407615C (en) * | 1924-12-23 | August Wolfsholz Presszementba | Process for the production of site stakes in soil containing bog acid | |
GB298478A (en) * | 1927-10-08 | 1929-01-24 | Arthur Desauw | Improvements in or relating to concrete piles and process of constructing same |
US3336760A (en) * | 1963-11-21 | 1967-08-22 | Richard E Landau | Construction of support columns in soil |
DE2120691A1 (en) * | 1971-04-27 | 1972-11-09 | Jebens, Claus, Dipl.-Ing., 2000 Hamburg | Method of manufacturing a composite pile |
NL7808047A (en) * | 1978-07-31 | 1980-02-04 | Koninkl Nederhorst Bouw B V | Reinforced concrete foundation post positioning - involves cement and grout pressure-fed beneath post, excess water removal and pressure application around post location |
NL8802318A (en) * | 1988-09-19 | 1990-04-17 | Ballast Nedam Groep Nv | Pile foundation-forming method - delivers material through tubular drill bit core |
-
1992
- 1992-05-14 NL NL9200855A patent/NL9200855A/en not_active Application Discontinuation
-
1993
- 1993-05-14 EP EP93201383A patent/EP0574057A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE407615C (en) * | 1924-12-23 | August Wolfsholz Presszementba | Process for the production of site stakes in soil containing bog acid | |
GB298478A (en) * | 1927-10-08 | 1929-01-24 | Arthur Desauw | Improvements in or relating to concrete piles and process of constructing same |
US3336760A (en) * | 1963-11-21 | 1967-08-22 | Richard E Landau | Construction of support columns in soil |
DE2120691A1 (en) * | 1971-04-27 | 1972-11-09 | Jebens, Claus, Dipl.-Ing., 2000 Hamburg | Method of manufacturing a composite pile |
NL7808047A (en) * | 1978-07-31 | 1980-02-04 | Koninkl Nederhorst Bouw B V | Reinforced concrete foundation post positioning - involves cement and grout pressure-fed beneath post, excess water removal and pressure application around post location |
NL8802318A (en) * | 1988-09-19 | 1990-04-17 | Ballast Nedam Groep Nv | Pile foundation-forming method - delivers material through tubular drill bit core |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999011870A1 (en) * | 1997-09-04 | 1999-03-11 | Josef Möbius Bau-Gesellschaft (GmbH & Co.) | Method and sheathing for producing a ground column to support building or travelling loads |
EP1985765A1 (en) | 2007-04-25 | 2008-10-29 | Jean-Marie Renovation | Device and method for installing a helical foundation micro-pile |
CN101634145B (en) * | 2009-07-29 | 2011-12-28 | 中铁二院工程集团有限责任公司 | Anti-slide pile with vertical prestressed anchor cables |
Also Published As
Publication number | Publication date |
---|---|
NL9200855A (en) | 1993-12-01 |
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