EP1922449B1 - Procede de consolidation de sols et de stabilisation de fondations - Google Patents

Procede de consolidation de sols et de stabilisation de fondations Download PDF

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Publication number
EP1922449B1
EP1922449B1 EP06777128A EP06777128A EP1922449B1 EP 1922449 B1 EP1922449 B1 EP 1922449B1 EP 06777128 A EP06777128 A EP 06777128A EP 06777128 A EP06777128 A EP 06777128A EP 1922449 B1 EP1922449 B1 EP 1922449B1
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EP
European Patent Office
Prior art keywords
foundation
injection
soil
injections
hollow anchor
Prior art date
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Active
Application number
EP06777128A
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German (de)
English (en)
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EP1922449A1 (fr
Inventor
Ilario Bridi
Enrico Nardelli
Fabiola Panizza
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.)
Prematek Srl
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Prematek Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from ITBZ20050045 external-priority patent/ITBZ20050045A1/it
Priority claimed from ITBZ20050065 external-priority patent/ITBZ20050065A1/it
Application filed by Prematek Srl filed Critical Prematek Srl
Publication of EP1922449A1 publication Critical patent/EP1922449A1/fr
Application granted granted Critical
Publication of EP1922449B1 publication Critical patent/EP1922449B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/48—Foundations inserted underneath existing buildings or constructions

Definitions

  • the JP 8260500 describes an injection process for a "chemical liquid" in a soil layer under the foundations of a structure to cause the soil compaction, the lifting of the structure, including its foundations to bring this, for example, from an inclined position in a normal position.
  • the generic EP 1536069 describes a method for soil stabilization and stabilization of building foundations by compaction of the soil in the area substantially under the foundations by injecting expanding and hardening resins through pipes which are inserted into bores, wherein after injection through these pipes, the lifting of the foundation and took place Solidification of the soil is detected. A use of the remaining pipes in the ground as tie rods, or a determination of the same at the foundation, for the purpose of permanent stabilization, is not provided.
  • the invention has as its object to provide a method of the type mentioned which is suitable for the consolidation of soils and the stabilization of the foundations of structures or components, wherein the floors and foundations, which absorb the ongoing and unforeseen loads of a building so on the Ground that the stabilization also, due to physical, chemical and / or geological changes which over time, within the injected resin composition and / or in the consolidated and / or compacted soil mass, can occur, is ensured.
  • the invention proposes that the inclusion of the above-mentioned ongoing and unforeseen loads of a building, except from, by injecting expanding synthetic resins, consolidated and / or compacted soil, in addition to a metallic reinforcement, on the one hand with the said foundation or connected to the structural elements and on the other hand, in a time-efficient manner, carried by the foot ends of the reinforcing bars and by the shear connection along these reinforcing bars takes place.
  • the injection of the expanding synthetic resins is not on the usual, rather thin-walled and smooth copper or plastic tubes but by means of known hollow, preferably strong resilient, steel rods, eg of the type "DYWIDAG", but without the use of other, possibly non-metallic, Exclude materials such as fiber-reinforced synthetic resins or carbon.
  • the tie rods are inserted in holes that penetrate the foundation. These rods which are preferably themselves, for the purpose of execution of the holes, provided with drill bit, according to the invention along its longitudinal extent with injection holes provided via which an injection into the ground in different depths is feasible.
  • the length of the rods is dimensioned such that they project with their upper end at least slightly beyond the hole provided in the foundation.
  • the injection of synthetic resins in different depths and at different time intervals can be done via known or inventive closure devices, or via calibrated or controlled valves, which are provided on the injection holes of the hollow anchor rods.
  • Practice has shown that in an advantageous manner, the control of the exit of the synthetic resins through the injection holes in the hollow anchor rods in different depths feasible by the injection of the resins via its own injection pipe (preferably made of copper) which is longitudinally displaceable within the said hollow anchor rod ,
  • the injection of synthetic resins is done by first these from the Injection holes at the lower end of the anchor rod exit, the following injections take place in a higher depth, on the next higher injection holes provided by the inner tube is progressively pulled each with its lower end up and a higher position to those arranged in a certain depth Injection holes on the anchor rod occupies.
  • the injection regions in the individual depth positions are limited by sealing collars which seal the annular space between the inner surface of the drill hole and the anchor rod outer surface and prevent a backflow of the injected resin upwards.
  • These sleeves for example made of foam rubber, are each, in the longitudinal extension of the anchor rod, between the injection holes of the respective depth position, fixedly mounted on the anchor rod and lie down elastically on the bore hole inside.
  • the anchor rod can further be provided with elastic spacers so that as possible a coaxial position of the anchor rod is secured within the wellbore.
  • the invention can further at the upper end of the anchor rod, which extends through the hole in the foundation, a threaded sleeve or a nut are placed which are dimensioned such that they can take a position within the borehole in the foundation in order by the "pouring" an efficient anchoring to reach the anchor rod on the foundation.
  • the invention does not exclude that the connection achieved by "pouring” is additionally secured by known metallic fasteners, or that the anchoring is achieved exclusively via known fasteners, with or without the use of known adhesives.
  • the number of hollow anchor rods which are firmly connected to the foundation of the building, are able to absorb the ongoing and random loads, at the foot of the tie rods and shear composite along the same anchor rods, the shear bond due to the solidification and / or compression of the Bodens due to the injection and the foaming of synthetic resins is particularly efficient, but above all, due to any changes that take place over time in the resin, or in the soil, is largely sufficient.
  • At least that part of the anchor rod which traverses the cross section of the foundation is provided with an external thread, with annular external grooves or with a different profiling which provides the grip for the materials poured or injected between the anchor rod and the inner wall of the bore in the foundation (specific adhesive resins, injection mortar, liquid mortar) increased;
  • this part of the anchor rod may be provided with a cross-section or a shape which is suitable for fixing to support elements which in turn are anchored to the foundation.
  • the entire anchor rod is provided with external thread or with an external profiling which is suitable to increase the contact surface with the solidified soil in order to achieve an increased shear bond along the anchor rod, which receives mainly axially acting loads.
  • the Fig. 1 is a schematic vertical sectional view through a hole which in an inclined position the foundation of a building and the penetrates the underlying soil and this is then solidify and compact to achieve a lifting of the foundation.
  • Fig. 2 shows the same, in Fig. 1 represented hole in which a hollow anchor rod is inserted which is equipped in different depths with injection openings and sealing sleeves against the return flow of the resin; the upper end of the anchor rod projects beyond the upper surface of the foundation.
  • the Fig. 3 shows the hole velvet, according to Fig. 2 , Introduced hollow anchor rod, in which an axially sliding injection tube is inserted to perform the injections in the different depths can be formed whereby solidification and compression body which cause the lifting of the soil including the foundation.
  • the Fig. 4 shows the hollow anchor rod without sliding injection tube, after the injection and. the compaction of the soil, after the maximum lifting of the foundation and with the established between the upper end portion of the hollow anchor rod and the foundation by pouring an adhesive without attaching cuffs or nuts.
  • Fig. 5 shows schematically, partly in section two areas of the same hollow anchor rod according to the invention during the injection phase.
  • the Fig. 6 shows on an enlarged scale the area between the hollow anchor rod and the foundation according to Fig. 4 in which the determination takes place by pouring.
  • the Fig. 7 shows the side view of a conical seal cuff which is elastically attached to an anchor rod (without external profiling).
  • Fig. 7a shows the side view of a seal sleeve which is attached by a clamp to an anchor rod (without external profiling).
  • the Fig. 7b shows the side view of an elastic centering device which is attached to an anchor rod (without external profiling).
  • the foundation 1a for a continuous wall of a building absorbs the permanent and random loads on the structure in order to transfer them to the ground 1. If this soil is not very compact, or if, in the case of physical and / or geological changes, the balance between the forces acting on the structure and the reaction forces of the soil 1 is not present, then the subsidence of the soil is not structural condition and the design of the structure (inclination of the entire structure, formation of cracks, etc.).
  • the renovation of the building by solidification of the soil 1 and by any compression for the purpose of raising the structure by injection of expanding resins, preferably in different depths and in different time periods is recommended according to the invention;
  • the said solidification and possible compaction of the soil are additionally secured according to the invention by an underground reinforcement and thereby guaranteed over time, this is created from the introduction of scattered anchor rods 5 to forward the forces acting on the foundation 1a forces in the soil depth.
  • This forwarding of the loads takes place in a combined manner by the shear connection between the longitudinal surface of the individual anchor rods 5 and the solidified soil and by the carrying capacity at the foot ends of the anchor rods which are cast in the solidification bodies.
  • connection between the subterranean structure of the anchor rods 5 which are poured into the compacted soil in the solids 5a, 5b, 5c according to the invention by "pouring" of adhesive resins or injection mortar into the well at the upper end portion 5d, by means of threaded sleeves or nuts and / or means mechanical connection between said upper end portions 5d of the rods 5 and support members fixed to the foundation.
  • the implementation of the holes 3, of which preferably a part with inclined axis 3i and a part with vertical axis 3v or created with a different angle of inclination is advantageously carried out by means of known hollow rods 5 of the type which is provided with drill bit and with an external thread and can be connected by means of threaded sleeves.
  • these rods 5 are provided along their longitudinal extension with injection bores 5e which are spaced apart from each other and which correspond to different depth positions.
  • the bores 3 can be made exclusively with simultaneous boring 3b of the foundation, or can be created partially or all in the immediate vicinity of the foundation or on this.
  • the hollow anchor rod 5 with drill bit is, after being removed from the bore 3, discharged from the drill bit and between the individual depth positions which are determined by the injection holes 5e with sealing cuffs 6 to prevent the backflow of the resin and possibly with centering devices 9, and then again inserted into the bore 3, ensuring that the lower end of the rod 5 at the bottom of the 3a Drill hole 3 rests while the upper end 5d of the rod 5 protrudes by a distance from the foundation which is slightly longer than the possible increase 1b of the foundation by compaction of the bottom 1 makes.
  • hollow anchor rods 5 of one of these series can be provided with injection bores exclusively at the lower end region, in which case, of course, injection C of the synthetic resin without injection tube 16 is performed directly over the cavity of anchor rod 5.
  • the injections in the different depth positions can also be achieved by known closure devices which are provided on the individual injection bores 5e of the anchor rods 5. These closure devices release the flow of the injection mass as soon as a certain pressure is reached inside the cavity of the anchor rod 5; depending on the depth, or depending on the desired order of injection in the different depth positions, the closing devices can be tared or actuated via "ripcords".
  • the determination 15, 15a between the foundation 1a and the individual anchor rods 5 by injection or "pouring" A specific adhesive resins, Injection grout or grout, between the upper end portion 5d of the rod 5 and the corresponding inner wall of the bore 3b in the foundation 1a or by mechanical connection between the end portion 5d of the rods and the foundation 1a by means of known Befest Trentsiguns institute, without to exclude a combined or double determination by mechanical connection and by "pouring".
  • the determination can be carried out by "pouring" particularly resistant by at that part of the anchor rod which penetrates within the bore 3b, the foundation 1a, a nut or other element is attached which has a larger cross-section than those of the rod 5 and which in embedded material 15 is "embedded".

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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)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Claims (6)

  1. Procédé de consolidation de sols et de stabilisation de fondations d'édifices par consolidation et/ou compactage du sol dans la zone se trouvant essentiellement sous les fondations, par injection de résines synthétiques durcissant et à expansion, par des tuyaux, lesquels sont introduits dans des trous de forage, caractérisé en ce que les tuyaux sont des tiges d'ancrage creuses (5) et en ce qu'après l'injection (C) par l'intermédiaire de tiges d'ancrage creuses (5) et après constatation du soulèvement (1 b) effectué des fondations (1a) et/ou de la consolidation effectuée du sol (1), les tiges d'ancrage creuses individuelles (5) sont fixées aux fondations (1a).
  2. Procédé selon la revendication 1, caractérisé en ce que l'injection (C) des résines synthétiques à expansion est réalisée à différentes profondeurs et à différents intervalles de temps.
  3. Procédé selon les revendications 1 et 2, caractérisé en ce qu'une première série d'injections (C) de résines synthétiques à expansion est réalisée dans une première période à un emplacement peu profond, en ce que dans une période suivante, au moins une série d'injections est réalisée à au moins un emplacement plus profond, et en ce que, dans le cas d'injections à des endroits plus profonds, chaque injection, laquelle est réalisée par l'intermédiaire des mêmes tiges d'ancrage creuses (5) à l'emplacement plus haut, est réalisée essentiellement à la même profondeur de la première série d'injections.
  4. Procédé selon la revendication 1, caractérisé en ce que, suite à la constatation du soulèvement (1 b) effectué et nécessaire des fondations (1a) ou de la consolidation nécessaire du sol (1), la fixation entre les fondations (1a) et les tiges d'ancrage creuses (5) individuelles est effectuée par « coulage » (A) ou injection de résines synthétiques collantes spécifiques, de mortier d'injection ou de mortier liquide, entre les zones supérieures des tiges d'ancrage (5) et les parois intérieures des trous de forage (3b) correspondant, depuis lesquels les extrémités supérieures desdites tiges d'ancrage (5) font saillie.
  5. Procédé selon la revendication 1, caractérisé en ce que, suite à la constatation du soulèvement (1 b) effectué et nécessaire des fondations (1a) ou de la consolidation nécessaire du sol, la fixation entre les fondations (1a) et les tiges d'ancrage creuses (5) individuelles est effectuée par fixation mécanique, directement, à l'aide d'éléments de fixation connus, ou indirectement, à l'aide de dispositifs de maintien métalliques, lesquels sont fixés à l'aide de moyens de fixation connus.
  6. Procédé selon la revendication 1, caractérisé en ce que l'injection de la résine synthétique est effectuée par le biais d'un tuyau d'injection (16) mobile (P, R) axialement à l'intérieur de l'espace creux de la tige (5), sachant que l'ouverture des orifices d'injection (5e) s'effectue progressivement par le retrait (R) progressif du tuyau (16), de l'emplacement le plus profond jusqu'à l'emplacement le plus haut.
EP06777128A 2005-09-06 2006-08-31 Procede de consolidation de sols et de stabilisation de fondations Active EP1922449B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITBZ20050045 ITBZ20050045A1 (it) 2005-09-06 2005-09-06 Procedimento ed attrezzatura per il consolidamento e la stabilizzazione di terreni con resine espandenti
ITBZ20050065 ITBZ20050065A1 (it) 2005-12-02 2005-12-02 Procedimento ed attrezzatura per il consolidamento di terreni e la stabilizzazione di fondazioni
PCT/EP2006/008500 WO2007028534A1 (fr) 2005-09-06 2006-08-31 Procede et dispositif de consolidation de sols et de stabilisation de fondations

Publications (2)

Publication Number Publication Date
EP1922449A1 EP1922449A1 (fr) 2008-05-21
EP1922449B1 true EP1922449B1 (fr) 2012-04-04

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Application Number Title Priority Date Filing Date
EP06777128A Active EP1922449B1 (fr) 2005-09-06 2006-08-31 Procede de consolidation de sols et de stabilisation de fondations

Country Status (3)

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EP (1) EP1922449B1 (fr)
AT (1) ATE552385T1 (fr)
WO (1) WO2007028534A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056261B4 (de) * 2008-11-06 2011-06-16 Bauer Spezialtiefbau Gmbh Ventilzentrierung
ES2343055B1 (es) * 2009-01-20 2011-06-06 Alberto Gonzalo Carracedo Procedimiento de reparacion de cimentaciones de aerogeneradores.
ITBZ20130034A1 (it) * 2013-07-17 2015-01-18 Prematek Srl Procedimento ed attrezzatura per il consolidamento e la stabilizzazione di terreni.
CN103774674B (zh) * 2014-01-15 2016-04-13 西安建筑科技大学 一种钢管托换桩与锚杆深基坑支护结构及其施工方法
IT201800007020A1 (it) 2018-07-09 2020-01-09 Sistema e procedimento per l'iniezione di resine espandenti in terreni da consolidare.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR986619A (fr) * 1943-11-25 1951-08-02 Sondages Etanchements Dispositif de tubage pour l'équipement des trous et forages d'injection
US5145291A (en) * 1990-08-13 1992-09-08 Roger Bullivant Of Texas, Inc. Method for forming a piling beneath a structure
CA2090430A1 (fr) * 1991-07-02 1993-01-03 Heinz Gruber Tube a injection et methode d'ancrage au sol
US6821056B1 (en) * 2003-03-21 2004-11-23 Patricia J. Mansour Grout injecting/structure anchoring system
EP1536069B1 (fr) * 2003-11-25 2005-12-21 Uretek S.r.l. Procédé de stabilisation du sol pour fondations
US7226247B2 (en) * 2003-12-18 2007-06-05 Barrett Robert K Method and apparatus for creating soil or rock subsurface support

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Publication number Publication date
ATE552385T1 (de) 2012-04-15
EP1922449A1 (fr) 2008-05-21
WO2007028534A1 (fr) 2007-03-15

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