WO1996001927A1 - Piliers renforces de sol stabilise et verification de leurs proprietes physiques - Google Patents
Piliers renforces de sol stabilise et verification de leurs proprietes physiques Download PDFInfo
- Publication number
- WO1996001927A1 WO1996001927A1 PCT/SE1995/000838 SE9500838W WO9601927A1 WO 1996001927 A1 WO1996001927 A1 WO 1996001927A1 SE 9500838 W SE9500838 W SE 9500838W WO 9601927 A1 WO9601927 A1 WO 9601927A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pillar
- reinforcing member
- soil
- torque
- process according
- Prior art date
Links
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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
Definitions
- the invention relates to a process for reinforcing a pillar of stabilized soil in accordance with the preamble of patent claim 1, a reinforcing member for use in carrying out said process and processes for testing a pillar of stabilized soil, using said reinforcing member.
- Stabilizing soil by producing pillars of stabilized soil directly in the ground is a method which has been known for quite some time, the so-called lime-pillar method. With the aid of this method, it is possible to improve the strength of fine grain low strength soil, such as clay, silt or organic dirt .
- the method involves inserting a stabilizing material into the soil with the aid of a mixing tool which is moved down into the soil to the desired maximum stabilization depth. The mixing tool is then drawn slowly upwards at the same time as the stabilization material is distributed under pressure while the mixing tool rotates to mix the stabiliza ⁇ tion material sufficiently with the soil.
- the stabilization material used consists of a dry powder material, such as quicklime or hydrated lime, plaster, cement, fly ash or a combination of said materials.
- the choice of stabilization material and the amount mixed in is of importance for the rigidity of the stabilized soil pillar and its compression properties.
- quicklime was commonly used as a stabilizing material, but lately, cement has also been used to a greater extent. In certain cases, only cement is used as a stabilizing material, due to the fact that cement, in many types of soil provides a more rapid and greater increase in the strength of the pillar. Cement is in many countries also an easily obtained and inexpensive material.
- Pillars of stabilized soil have recently come into use for stabilizing soil under high road and railway embankments and for steep slopes and deep shafts. These applications place great demands on the homogeneity and strength of each indi ⁇ vidual pillar, since the stability of a road embankment or a slope is determined to a large extent by the weakest portion of such a stabilization. Therefore, great demands must be placed on the quality and homogeneity of the pillars.
- the purpose of the present invention is to achieve a process for reinforcing a pillar of stabilized soil and a reinforcing member for use in carrying out said process as well as a process for testing the pillar with the aid of the reinfor ⁇ cing member. This is done by means of a process with the features disclosed in the characterizing clause of Claim 1, a reinforcing member with the features disclosed in the char- acterizing clause of claim 5 and testing processes with the features disclosed in the characterizing clauses of Claims 10 and 11.
- Fig. 1 is a schematic side view of a device for producing a pillar of stabilized soil
- Fig. 2 shows a schematic longitudinal section through a pillar of stabilized soil, made by means of the process according to the invention
- Fig. 3 is a schematic side view of a torque-transmitting member according to the invention
- Fig. 4 is an end view of a pillar of stabilized soil with a torque-transmitting member as shown in Fig. 3.
- Fig. 1 shows a device which is known per se for producing a pillar of stabilized soil.
- This device comprises a mixing tool 1, which in the case shown has two rings 2 to be pressed down into the soil.
- the mixing tool 1 is supported by a hollow rod 3, which in use rotates in the direction of the arrow 4.
- a stabilizing agent such as lime, cement or similar material, with the aid of compressed air.
- the mixing tool 1 is rotated down into the soil to the desired maximum stabi ⁇ lizing depth, and is then slowly pulled up at the same time as a predetermined amount of stabilizing agent is dispensed.
- Fig. 1 shows as well a reinforcing member 5 according to the invention, which is inserted in the hollow rod 3 and projects out from the lower end.
- the reinforcing member 5 is provided at its lower end with an anchoring means 6 in the form of wings to facilitate insertion of the reinforcing member 5 into the soil.
- the reinforcing member 5 is inserted into the soil together with the mixing tool 1, but when the mixing tool 1 is pulled up, the reinforcing member 5 remains in the soil, and the anchoring means 6 provides an anchor against the lower portion of the produced pillar of stabilized soil.
- Fig. 2 shows schematically a longitudinal section through a pillar 7 of stabilized soil. This figure also shows the rein ⁇ forcing member 5 with the anchoring means 6 as well as an anchoring means 8 which is fixed to the reinforcing member 5 at its end located near the soil surface 9.
- Fig. 2 also shows a number of vibration sensors 10, which are mounted in the reinforcing member 5 at predetermined distances from its upper end, i.e. the end located at the soil surface 9.
- the vibration sensors 10 are electrically coupled to a registering device (not shown) for a purpose which will be described in more detail below.
- Fig. 3 shows a torque-transmitting means 11.
- This torque- transmitting means 11 consists of a pipe 12 and flanges or wings 13 arranged thereon.
- the flanges 13 extend essentially radially relative to the pipe 12 and are preferably arranged diametrically opposite to each other in pairs relative to the pipe 12.
- This torque-transmitting means 11 is intended to be inserted into a pillar 7 of stabilized soil to make it possible to test the quality of said pillar, as will be described in more detail below.
- Fig. 4 is an end view of a pillar 7 with a torque-transmit ⁇ ting means 11 inserted therein. As can be seen in Fig. 4, a sleeve is also arranged around the pillar to reduce the friction between it and the surrounding unstabilized soil.
- the process according to the invention for reinforcing a pillar of stabilized soil thus involves axially inserting a reinforcing member 5 into the pillar 7 as the pillar is produced, but it is also conceivable to insert the rein ⁇ forcing member 5 after the making of the pillar 7. It is, of course, also possible to use a plurality of reinforcing members, which can be distributed in different ways over the cross section of the pillar 7. Only a single reinforcing member 5 has been described above inserted centrally into the pillar 7 with the aid of the mixing tool 1.
- the reinforcing member 5 which is used in carrying out the process, consists of a rod, a pipe, a line or similar means with elongated shape.
- the reinforcing member 5 is suitably made of metal, preferably steel, or some other material of high strength, such as reinforced plastic or a composite material.
- the quality of the pillar 7 can be tested.
- the speed of propagation of the wave along the pillar can be determined with the aid of the vibration sensors 10, by means of the "down hole"-method.
- the speed of propagation of the wave is dependent on the mechanical properties of the pillar, i.e. its stiffness and strength, and the vibration sensors 10 together with an associated registering equipment, provide the possibility of determining the quality of the pillar 7. It is, for example, possible to determine the position and size of any zones of weakness, of which one is shown at 15 in Fig. 2.
- Another possibility for determining the quality of the pillar 7 is obtained by using the torque-transmitting means 11.
- the torque-transmitting means 11 When it has been inserted into the pillar 7 and the pillar has hardened, it is possible to apply a torque to the torque- transmitting means 11. This torque can then be increased until the pillar 7 breaks, thus providing a measure of the quality of the pillar. Alternatively, it is possible to break off the testing when a sufficient torque has been obtained, to guarantee that the pillar has sufficient strength for its intended purpose.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Piles And Underground Anchors (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Procédé de renforcement d'un pilier de sol stabilisé selon lequel au moins un élément de renfort (5) est introduit axialement dans le pilier (7) lors de sa réalisation ou après, mais avant que le pilier (7) n'ait durci à un tel point que ladite introduction soit rendue quasiment impossible. L'élément de renfort (5) peut être une barre, un tube, un câble ou une pièce allongée similaire dont l'une des extrémités au moins est munie d'un moyen d'ancrage (6) sur le pilier (7). L'invention prévoit également des tests de résistance effectués à l'aide de capteurs de vibrations (10) placés en des points donnés de l'élément d'ancrage (5), ou de transmetteurs de couples permettant de soumettre le pilier (7) à des contraintes de torsion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU29954/95A AU2995495A (en) | 1994-07-08 | 1995-07-07 | Reinforced pillar of stabilized soil and investigation of its physical properties |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9402423A SE9402423D0 (sv) | 1994-07-08 | 1994-07-08 | Förstärkt pelare av stabiliserad jord |
SE9402423-9 | 1994-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996001927A1 true WO1996001927A1 (fr) | 1996-01-25 |
Family
ID=20394678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/000838 WO1996001927A1 (fr) | 1994-07-08 | 1995-07-07 | Piliers renforces de sol stabilise et verification de leurs proprietes physiques |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2995495A (fr) |
SE (1) | SE9402423D0 (fr) |
WO (1) | WO1996001927A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1001134A1 (fr) * | 1998-11-13 | 2000-05-17 | Geoforschungszentrum Potsdam | Dispositif d'ancrage avec un capteur sismique |
SG93217A1 (en) * | 1999-10-15 | 2002-12-17 | Abv Engineering Pte Ltd | Bored piles |
FR2872283A1 (fr) * | 2004-06-25 | 2005-12-30 | Rincent Btp Services Soc En Co | Procede et dispositif de determination de l'effort de traction auquel est soumis un element scelle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128011A (en) * | 1974-07-16 | 1978-12-05 | Savage Robert J | Investigation of the soundness of structures |
SE470445B (sv) * | 1992-08-21 | 1994-03-28 | Bpa Bygg Ab Lc Markteknik Scan | Sätt att prova i marken skapade stabiliserande och/eller stödande pelare och anordning härför |
WO1994013889A1 (fr) * | 1992-12-10 | 1994-06-23 | Yit-Yhtymä Oy | Procede et dispositif de consolidation du sol et leur application |
-
1994
- 1994-07-08 SE SE9402423A patent/SE9402423D0/xx not_active Application Discontinuation
-
1995
- 1995-07-07 WO PCT/SE1995/000838 patent/WO1996001927A1/fr active Application Filing
- 1995-07-07 AU AU29954/95A patent/AU2995495A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128011A (en) * | 1974-07-16 | 1978-12-05 | Savage Robert J | Investigation of the soundness of structures |
SE470445B (sv) * | 1992-08-21 | 1994-03-28 | Bpa Bygg Ab Lc Markteknik Scan | Sätt att prova i marken skapade stabiliserande och/eller stödande pelare och anordning härför |
WO1994013889A1 (fr) * | 1992-12-10 | 1994-06-23 | Yit-Yhtymä Oy | Procede et dispositif de consolidation du sol et leur application |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1001134A1 (fr) * | 1998-11-13 | 2000-05-17 | Geoforschungszentrum Potsdam | Dispositif d'ancrage avec un capteur sismique |
SG93217A1 (en) * | 1999-10-15 | 2002-12-17 | Abv Engineering Pte Ltd | Bored piles |
FR2872283A1 (fr) * | 2004-06-25 | 2005-12-30 | Rincent Btp Services Soc En Co | Procede et dispositif de determination de l'effort de traction auquel est soumis un element scelle |
WO2006010830A1 (fr) * | 2004-06-25 | 2006-02-02 | Rincent Btp Services | Procede et dispositif de determination de l'effort de traction auquel est soumis un element scelle |
Also Published As
Publication number | Publication date |
---|---|
SE9402423D0 (sv) | 1994-07-08 |
AU2995495A (en) | 1996-02-09 |
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