EP1936039B1 - Verfahren zur Fundamentverstärkung, das eine in den Boden eingelassene Fundamentplatte umfasst, insbesondere für Fundamente von Masten, und so erhaltene Konstruktion - Google Patents

Verfahren zur Fundamentverstärkung, das eine in den Boden eingelassene Fundamentplatte umfasst, insbesondere für Fundamente von Masten, und so erhaltene Konstruktion Download PDF

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Publication number
EP1936039B1
EP1936039B1 EP07122090A EP07122090A EP1936039B1 EP 1936039 B1 EP1936039 B1 EP 1936039B1 EP 07122090 A EP07122090 A EP 07122090A EP 07122090 A EP07122090 A EP 07122090A EP 1936039 B1 EP1936039 B1 EP 1936039B1
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EP
European Patent Office
Prior art keywords
foundation
slab
ground
trench
wall
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Application number
EP07122090A
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English (en)
French (fr)
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EP1936039A1 (de
Inventor
Bruno Renoud-Lias
Julien Landrot
Serge Borel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Priority to PL07122090T priority Critical patent/PL1936039T3/pl
Publication of EP1936039A1 publication Critical patent/EP1936039A1/de
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Publication of EP1936039B1 publication Critical patent/EP1936039B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D37/00—Repair of damaged foundations or foundation structures
    • 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
    • E02D27/42—Foundations for poles, masts or chimneys

Definitions

  • the present invention relates to a method of reinforcing pylon foundations, including but not limited to electric pylons for high voltage power lines and a reinforcing structure.
  • the foundations of pylons are most often made of concrete massifs, generally of cylindrical or rectangular shape and formed of a chimney surmounting one or more horizontal slabs whose sections increase with the depth.
  • the depth of the lower slab typically ranges from 1.5 m to 5 m below the surface of the natural terrain.
  • a redan is sometimes dug in the natural soil.
  • the solution usually implemented is to install micropiles which are bonded to the existing foundation block by means of a slab or a reinforced concrete beam.
  • the patent application FR 2 881 448 gives an example of reinforcement devices of the type mentioned above.
  • micro-piles are sized to take up all the efforts of the structure thus ignoring the contribution of the existing superficial foundation. Indeed, the behavior of the micro-piles is generally much steeper than that of the massif and in the majority of cases we can no longer consider the share of load taken up by the superficial massif.
  • a first object of the present invention is to propose a method of reinforcing tower foundations that is simpler to implement and more efficient compared to the cost of the work undertaken, while avoiding weakening the foundation during the reinforcement operations.
  • the foundation When subjected to compressive forces, the foundation resists by transferring the load of the structure by pressure on the ground under the lower flange of the massif.
  • the figure 1 annexed illustrates how the foundation resists the foundation when it is subject to pull-out efforts.
  • the natural soil 10 with its surface S. It is also shown the foundation 12 consists of the horizontal slabs 14 and 16 and its chimney 18 on the upper face 18a which is fixed pylon. In this figure, the embankment 20 has also been shown in the ground, which must be put back in place after the foundation 12 has been made.
  • the foundation mass resists by its own weight increased by the weight of a cone of land represented by the lines 22 overlying the lower flange, cone whose volume depends essentially on the mechanical characteristics of the ground.
  • the invention is based on the principle that consists of earthworks to increase the volume of soil that will withstand the stripping efforts applied to the foundation 12 while limiting the work to the maximum and also limiting, during these works, the reduction of the lift and finally adapting to the restrictions of possibility of intervention due to the conditions of access under the structure carried by the foundation mass.
  • a further object of the invention is that this process requires only a small amount of external material.
  • the wall or the vertical walls (s) made in the ground which cooperates (s) mechanically with the foundation increases (s) the volume of terrain participating in the resistance to tearing forces that can be applied to the pylons and therefore to the foundation, because of their size.
  • the method comprises the realization of vertical trenches whose dimensions can be relatively small while providing a very significant improvement in resistance to tearing forces.
  • the trench or trenches is (are) carried out by adding at least partly a hydraulic binder.
  • vertical wall in the ground is meant a work of art consisting of a resistant material buried in the ground whose height is very substantially greater than its width.
  • the soil is cut to make this trench and the cut soil is mixed with a hydraulic binder to obtain a resistant wall in the soil.
  • the layout of the wall or walls relative to the contour of the slab of the foundation can take different forms as soon as this wall cooperates mechanically with the foundation.
  • the walls can in particular be arranged on either side of the foundation chimney or not to pass through this chimney but of course intersect the slab of the foundation.
  • the width of the trench and therefore of the wall is between 20 and 50 cm.
  • the width of the trench that is to say of the wall is less than a quarter of the width of the slab.
  • a second object of the invention is to provide a reinforcement structure of a foundation of the type obtained by the implementation of the method.
  • the reinforcing structure of a foundation is characterized in that it comprises at least one mechanically strong vertical wall made in the ground, the layout of said wall, in horizontal projection, intersecting said foundation slab to mechanically cooperate with said foundation, a portion of said wall extending beyond the contour of said slab.
  • this foundation 12 is constituted by horizontal slabs 14 and 16 and by the chimney 18.
  • the method consists in producing one or more resistant walls buried in the ground which cooperates with the foundation and which makes it possible to increase the volume of soil very substantially. natural participation in resistance to pullout efforts.
  • the volume of natural soil that will participate in the resistance to pulling forces is not only that which is disposed above the slabs 14 and 16, but also the volume of soil which cooperates with the two walls 26 and 28. This allows for a total area of walls to obtain a very significant increase in the volume of soil participating in the resistance to pulling forces because the walls extend beyond the outline of the slab.
  • the width 1 of the walls 26 and 28 is much smaller than the dimensions L and L 'of the slab of the foundation. Typically, this width is of the order of 20 to 50 cm and in any case much less than a quarter of the dimensions L and L 'of the foundation.
  • each wall 26, 28 is such that a portion of the wall extends beyond the contour of the slab.
  • a technique which consists in cutting a trench 26 ', 28' in the ground whose shape corresponds to that of the wall to be produced and, while making this cut, mix the cut soil with a suitable hydraulic binder.
  • This technique is in itself perfectly known and called “soil mixing" in the Anglo-Saxon language. There is therefore no need to describe it in more detail.
  • the amount of hydraulic binder depends on the nature of the soil in place and the mechanical characteristics that one wants to obtain for the mixture soil / hydraulic binder. This amount typically varies from 75 kg / m 3 to 400 kg / m 3 of soil in place. Preferably, this amount is between 125 kg / m 3 and 250 kg / m 3 .
  • the binder can be introduced either wet, that is to say in the form of a grout injected at the mixing tool, or dry, that is to say in powder form, arranged on the ground surface in a pretrench or injected at the tool into a compressed air flow.
  • This tool is constituted by a mobile machine 30 preferably provided with tracks 32 whose platform is equipped with a mechanical arm 36 at the end 36a of which is mounted the tool 38 for cutting the soil and mixing it. ci with the hydraulic binder.
  • the tool 38 is constituted by an endless chain 40 carrying cutting lugs 42 and mixing elements 44.
  • the central structure 46 of the tool further comprises a pipe 48 for injecting into the ground the hydraulic binder.
  • This pipe 48 comprises one or more injection nozzles such as 50 distributed over the entire height of the tool.
  • FIGS. 3A, 3B and 3C show different possible shapes for the foundation reinforcement wall 12.
  • FIG. 3A there are three walls 40, 42 and 44 which are arranged radially with respect to the chimney 18 of the foundation and mutually offset by 120 degrees.
  • trenches and walls show that the method which is the subject of the invention can adapt very easily to the various obstacles that may occur near the foundation to be reinforced. They also show that it is possible to adapt the reinforcement elements to the preferred directions of pull-out efforts that can be applied to the foundation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Foundations (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (11)

  1. Verfahren zum Verstärken von Fundamenten, insbesondere für Masten, wobei die Fundamente (12) wenigstens eine im wesentlichen horizontale Platte (14, 16) aufweisen, die im Boden eingegraben ist, dadurch gekennzeichnet, daß es die folgenden Schritte aufweist:
    a) man stellt mindestens einen senkrechten Graben in dem Boden her, dessen Verlauf einen Teil der Platte (14, 16) schneidet, wobei der Graben eine Breite, die viel kleiner ist als die horizontalen Maße der Platte, und eine Höhe besitzt, die viel größer ist als seine Breite, wobei sich in horizontaler Projektion ein Teil des Grabens über die Kontur der Platte hinaus erstreckt, und
    b) man füllt den Graben mit einem Material, das mindestens zum Teil ein hydraulisches Bindemittel enthält, um in dem Boden eine widerstandsfähige Wand (26, 28, 40, 42, 44, 46, 48, 50, 52, 54, 56, 62', 64', 66', 68') zu bilden, die mechanisch mit der Platte verbunden ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Schritt b) darin besteht, den Boden zu zerschneiden, um den Graben herzustellen, und den zerschnittenen Boden mit einem hydraulischen Bindemittel zu vermischen, um die widerstandsfähige Wand in dem Boden zu erzielen.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß man zwei Gräben (26, 28) herstellt, die zu beiden Seiten des Schachts des Fundaments angeordnet sind, wobei jeder Graben zum Teil auf der Platte (14, 16) ruht.
  4. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Verlauf des Grabens (54, 56) nicht durch den Schacht des Fundaments verläuft.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Breite des Grabens kleiner ist als ein Viertel der Breite der Platte (14, 16).
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Breite des Grabens (26, 28) zwischen 20 und 50 cm liegt.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Fundamente mehrere Fundamentelemente (62, 64, 66, 68) aufweisen, die voneinander beabstandet sind, wobei jedes Fundamentelement mindestens eine im wesentlichen horizontale Platte und einen Schacht aufweist, und daß man mehrere Gräben (62, 64, 66, 68) herstellt, wobei jeder Graben die Platte eines Fundamentelements schneidet.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Gräben im wesentlichen außerhalb des Vielecks liegen, dessen Scheitel die Schächte der Fundamentelemente (62, 64, 66, 68) sind.
  9. Fundament mit mindestens einer im wesentlichen horizontalen Platte (14, 16), dadurch gekennzeichnet, daß es ferner mindestens eine vertikale, mechanische widerstandsfähige Wand (26, 28, 40, 42, 44, 46, 48, 50, 52, 54, 56, 62', 64', 66', 68') aufweist, die in dem Boden hergestellt ist, wobei der Verlauf der Wand in horizontaler Projektion die Platte des Fundaments schneidet, um mechanisch mit dem Fundament zusammenzuwirken, wobei sich ein Teil der Wand in horizontaler Projektion über die Kontur der Platte hinaus erstreckt.
  10. Fundament nach Anspruch 9, dadurch gekennzeichnet, daß die Wand durch Zerschneiden des Bodens, um einen vertikalen Graben zu erzielen, der den Verlauf der Wand hat, und durch Mischen des zerschnittenen Bodens mit einem hydraulischen Bindemittel hergestellt wird.
  11. Fundament nach einem der Ansprüche 9 und 10, dadurch gekennzeichnet, daß die Breite der Wand mindestens gleich dem Viertel der Maße der Platte (14, 16) des Fundaments ist.
EP07122090A 2006-12-05 2007-12-03 Verfahren zur Fundamentverstärkung, das eine in den Boden eingelassene Fundamentplatte umfasst, insbesondere für Fundamente von Masten, und so erhaltene Konstruktion Active EP1936039B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07122090T PL1936039T3 (pl) 2006-12-05 2007-12-03 Sposób wzmocnienia fundamentów zawierających płytę zakopaną w gruncie, zwłaszcza fundamentów dla słupów i uzyskana struktura

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0655316A FR2909395B1 (fr) 2006-12-05 2006-12-05 PROCEDE DE RENFORCEMENT DE FONDATIONS COMPORTANT UNE DALLE DANS LE SOL, NOTAMMENT DE FONDATIONS POUR PYLâNES, ET STRUCTURE OBTENUE

Publications (2)

Publication Number Publication Date
EP1936039A1 EP1936039A1 (de) 2008-06-25
EP1936039B1 true EP1936039B1 (de) 2010-08-18

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EP07122090A Active EP1936039B1 (de) 2006-12-05 2007-12-03 Verfahren zur Fundamentverstärkung, das eine in den Boden eingelassene Fundamentplatte umfasst, insbesondere für Fundamente von Masten, und so erhaltene Konstruktion

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EP (1) EP1936039B1 (de)
AT (1) ATE478200T1 (de)
DE (1) DE602007008518D1 (de)
ES (1) ES2351097T3 (de)
FR (1) FR2909395B1 (de)
PL (1) PL1936039T3 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2969672B1 (fr) * 2010-12-24 2014-02-07 Soletanche Freyssinet Procede de renforcement de la resistance au renversement des fondations d'un pylone
CN103174163A (zh) * 2011-12-26 2013-06-26 贵阳铝镁设计研究院有限公司 一种预制柱基础杯口的加高方法及结构
CN110344436A (zh) * 2019-07-23 2019-10-18 河南海鹏送变电工程有限公司 一种输电线路塔基加固方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3213240B2 (ja) * 1996-07-11 2001-10-02 株式会社奥村組 既設構造物の支持杭補強構造とその補強方法
FR2845705B1 (fr) * 2002-10-15 2005-05-27 Ineo Reseaux Haute Tension Procede pour renforcer les fondations d'un pylone
FR2874223B1 (fr) * 2004-08-12 2008-04-18 Scerer Dispositif et procede de renforcement d'une fondation de pylone
FR2881448B1 (fr) * 2005-01-31 2008-07-18 Spie Fond S Sa Procede de renforcement de fondations de pylone par jumelage

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Publication number Publication date
FR2909395A1 (fr) 2008-06-06
PL1936039T3 (pl) 2011-03-31
EP1936039A1 (de) 2008-06-25
ATE478200T1 (de) 2010-09-15
ES2351097T3 (es) 2011-01-31
FR2909395B1 (fr) 2009-02-27
DE602007008518D1 (de) 2010-09-30

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