EP2669438A1 - Procédée de reparation d'un bâtiment - Google Patents

Procédée de reparation d'un bâtiment Download PDF

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Publication number
EP2669438A1
EP2669438A1 EP13169397.0A EP13169397A EP2669438A1 EP 2669438 A1 EP2669438 A1 EP 2669438A1 EP 13169397 A EP13169397 A EP 13169397A EP 2669438 A1 EP2669438 A1 EP 2669438A1
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EP
European Patent Office
Prior art keywords
building
beams
foundation
buildings
suspension
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Withdrawn
Application number
EP13169397.0A
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German (de)
English (en)
Inventor
Genesio Setten
Stefano Secchi
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.)
Setten Genesio SpA
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Setten Genesio SpA
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Filing date
Publication date
Application filed by Setten Genesio SpA filed Critical Setten Genesio SpA
Publication of EP2669438A1 publication Critical patent/EP2669438A1/fr
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations

Definitions

  • the present invention relates to a method for the temporary suspension of existing buildings, in particular residential buildings and daunting buildings.
  • the invention specifically relates to a method of this type in which the existing building is entirely suspended, in safe conditions and regardless of the type of foundations thereof, so as to allow digging or new foundation operations in the area below the building in conditions of top safety, ease and execution speed.
  • the lifting extent may be extremely limited, i.e. what suffices to release the entire weight of the building on the plurality of jacks and to hence be able to freely remove the soil under it to erect the under-building, or it may arrive up to even a few meters, in order to obtain an actual lifting of the building, to allow the building of a new above-ground storey of the building or of a building support system on stilts, depending on the reasons which have led to the indication of lifting the building.
  • the above-described building method implies a certain complexity, both concerning the installation and the procedure and it furthermore has - when used to erect an under-foundation or an under-building - serious drawbacks as far as the accessibility to the digging area is concerned.
  • the accessibility to the digging area is limited precisely by the same plurality of hydraulic jacks, which as a matter of fact must for obvious reasons be located evenly and sufficiently close across the entire building perimeter/area, so that it is not normally possible to accomplish a sufficiently large side entrance to the digging area to allow access to mechanic digging means.
  • the dig size and depth are seriously limited by the need not to impair, with the digging operations, the stability of the ground on which such jacks temporarily rest.
  • the problem at the basis of the present invention is hence that of proposing a new suspension method of existing buildings for the erection of under-foundations or under-buildings which is free from the above-cited drawbacks.
  • a second object of the invention is furthermore that such method does not limit the size of the dig in the area underlying the existing building, which dig can hence be sized at pleasure until reaching and possibly even exceed the size of the building, at least in the case of buildings which fall within non exceptional size classes.
  • a third object of the invention is then that such method allows the formation of wide lateral accesses to the area underlying the building, so that the digging operations may be performed, where desirable, with mechanical means having free access from the outside.
  • a fourth object of the invention is finally that of allowing an easy, effective and integral making safe of existing buildings with respect to seismic events.
  • Step 1 Forming of new deep, outside foundations
  • Such deep foundations may be built with microposts, bored posts, sheet piles, etc., with or without top plinth, or, in the presence of ground water:
  • the foundations may have the simple form of two parallel linear elements 1 ( figs. 1 and 2 ), while in the presence of ground water they must necessarily have a continuous and closed shaped, normally rectangular or square ( fig. 1 ), which in addition to elements 1 comprises crosswise elements 1a to allow the dig to be formed as a watertight compartment until work completion.
  • Step 2 Definitioa of the provisional grid foundation
  • the building suspension method of the present invention provides the forming of a beam grid, along the same axis of the load-bearing walls M of the building, as schematically illustrated in fig. 1 .
  • a first series of beams 2, here also defined as main beams, extends outside the perimeter of the building, until resting on the above-described deep foundations 1.
  • a second series of beams 3, here also defined as secondary beams, rests instead on main beams 2 thus completing the above-said provisional foundation grid of the load-bearing walls M of the existing building.
  • Step 3 Building of the main and secondary beams of the grid, in a modular configuration with adjacent ashlars
  • the building of the main and secondary beams of the grid is accomplished with a similar technique to the traditional one of under-foundations, i.e. forming a series of adjacent foundation portions 4, here defined as ashlars, through partial digging at the impost depth of the foundations of building E according to a preset sequence.
  • the impost depth of ashlars 4 must preferably be above or equal to the intrados depth of the existing foundations of the building in order not to reduce the load-bearing capacity thereof. It is nevertheless possible to extend the depth of ashlars 4 also below the impost depth of the existing foundations.
  • a main beam 2 consisting of six ashlars 4
  • ashlars are built according to an ordinate sequence which has been overall designed for the entire grid of beams 2 and 3, also as a function of the length of the individual ashlars 4, in order not to impair in any way the integrity of load-bearing walls M under which it is being built.
  • Each ashlar 4 is provided with a slack longitudinal reinforcement in a minimum extent, apt to comply with legal provisions, and with crosswise reinforcement (brackets) in the amount necessary to offer shear-resistance adequate to the transient and working stresses.
  • ashlars 4 furthermore have two features which are peculiar of the method of the present invention.
  • ashlars 4 are provided within with tubular elements made of metal or of other materials, for example knurled metal tubular sheaths, arranged according to a preset path in the longitudinal direction of the beams so as to form overall, once the building of ashlars 4 is completed, one or more continuous channels T which run across longitudinally the entire beam 2 or 3.
  • Channels T are suited to house metal wires by which it is possible, once the building of the different ashlars 4 making up the beam has been completed, to impart a post-tensioning condition to the beam in the permanent configuration thereof.
  • the individual ashlars are laterally shaped with mutually complementary shear keys 4a, sized in order to transmit, in part or wholly, the plan shearing stress between adjacent ashlars 4.
  • Step 4 Building of part of the secondary beams of the grid, in a continuous configuration
  • secondary beams 3 of the grid may be built in the form of continuous concrete or steel beams, and such beams may be formed directly in the wall thickness or outside said thickness, preferably in a symmetrical way, i.e. on both sides of the wall.
  • the sizes of the opening and the loads resting on beams 3 may require the adoption of inclined tie-rods fastened in an intermediate position of beam 3 and apt to release on adjoining load-bearing walls M part of the load which rests on the beam.
  • tie-rods are preferably fastened, at the upper end thereof, to a horizontal strut rather than directly to wall M.
  • Said horizontal strut extends between the two opposite walls M to which it is suitably constrained and acts both as element neutralising the tie-rod-induced lateral thrusts, and as stabilising element of the highest part of the existing building.
  • Step 5 Post-tensioning of the modular beams
  • the method of the invention provides the laying of harmonic-steel wires within the channels T formed inside ashlars 4, through manual or automatic insertion using so-called "strand-threading machines".
  • strand-threading machines In correspondence of the outer sides of the terminal ashlars 4 of beams 2, 3 metal stretching heads are rested, to which the wires are then connected according to the specific operation modes of the supplier of the post-tensioning system.
  • the post-tensioning degree and the wire stretching sequence of the individual beams 2, 3 are defined and sized in the structural project.
  • the path of the wires within the beams may be rectilinear or curvilinear with upward concavity.
  • the post-tensioning - normally adopted only for the main beams 2 resting on deep foundations 1 - accomplishes a contractive state which causes a limited suspension of the entire building, with resulting progressive transfer of the load of the same from the old to the new foundations.
  • the passage of the loads occurs with the utmost gradualness and hence in highly safe conditions and furthermore having the possibility to check any displacements of the axis line of beams 2, 3, while the post-tensioning load is gradually increased. In this step it is hence possible to carry out a validation of the project hypotheses and of the previsional subsidings.
  • the post-tensioning system of the beams may be accomplished through any one of the methods known in the sector, for example:
  • Step 7 Forming of the new foundations system
  • the building method of the present invention may develop in two different variants.
  • the provisional foundation consisting of the grid of beams 2 and 3 is maintained integrally as permanent foundation of the building; in this variant the new foundation built on the bottom of the dig will hence have to be sized only for supporting of the under-building erected under the ground floor of the building, which under-building will be structurally fully independent from the existing building.
  • the method of the invention according to this first variant, is hence completed.
  • the new foundation 5 is meant to support at the end the entire building - normally due to the fact that the provisional foundation system must at least in part be dismantled for architectural or logistic requirements - and it must hence be sized accordingly to support the entire load of the building.
  • the method of the invention still comprises steps 8 and 9 briefly described in the following.
  • Step 8 Connection of the new foundation to the existing building
  • load-bearing pillars or walls 6 are built in such positions as to then be able to adequately release on the new foundations 5 the entire load of the existing building as well as of the provisional foundation portion 2 which will be left at the end of the reconstruction intervention.
  • connection elements 6 When the connection elements 6 are able to support the loads entrusted thereto, the post-tensioning degree of main beams 2 is gradually reduced, so as to obtain a gradual limited lowering of the building onto new foundations 5 and 6, which are thus loaded with the weight of the building, simultaneously releasing from the same weight the provisional grid-like foundation of beams 2 and 3 and deep foundation 1.
  • Beams 2 and 3 may hence be partially removed according to the project indications and/or detached from deep foundations 1, for example in order to perform the restoration of the area outside the existing building in identical conditions to the original ones.
  • Step 10 Seismic insulation
  • the method for the suspenson of buildings of the present invention is finally particularly well-suited to accomplish the seismic insulation of existing buildings, without having to carry out invasive works on the existing masonry, which works, in addition to being extremely expensive, do not reach an equal safety level against seismic events and are in any case very difficult to accomplish in buildings of great historical or artistic value subject to the protection by the Ministry of Cultural Heritage and Activities, which precisely for this reason provides a derogation from the otherwise compulsory seismic adaptation.
  • the new portion of under-building remains foreign to the seismic insulation and must hence be maintained disjoined, from a structural and plant-engineering point of view, from the above-standing building, to allow mutual oscillations of the two buildings during a seismic event.
  • the present invention has fully reached all the set objects in a particularly simple and effective way and without the need for special machinery or equipment which are not already commonly available at the building companies.
  • the method of the invention allows the execution of under-buildings of existing buildings in conditions of high safety and, at the same time, of great rapidity, without altering in any way the structure and the finishes of the existing building and furthermore allowing, with the sole additional costs of seismic insulators I, the full anti-seismic making safe of the building.
EP13169397.0A 2012-05-28 2013-05-27 Procédée de reparation d'un bâtiment Withdrawn EP2669438A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000916A ITMI20120916A1 (it) 2012-05-28 2012-05-28 Metodo per la sospensione temporanea di edifici esistenti per la realizzazione di sottofondazioni/sottocostruzioni di detti edifici.

Publications (1)

Publication Number Publication Date
EP2669438A1 true EP2669438A1 (fr) 2013-12-04

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EP13169397.0A Withdrawn EP2669438A1 (fr) 2012-05-28 2013-05-27 Procédée de reparation d'un bâtiment

Country Status (2)

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EP (1) EP2669438A1 (fr)
IT (1) ITMI20120916A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580098A1 (fr) * 1992-07-21 1994-01-26 Bernfried Dr.-Ing. Sudbrack Procédé et dispositif de fondation à pieux
WO2009087469A2 (fr) * 2007-12-31 2009-07-16 So.L.E.S. - Societa Lavori Edili E Serbatoi S.P.A. Procédé et système pour remonter une structure de bâtiment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580098A1 (fr) * 1992-07-21 1994-01-26 Bernfried Dr.-Ing. Sudbrack Procédé et dispositif de fondation à pieux
WO2009087469A2 (fr) * 2007-12-31 2009-07-16 So.L.E.S. - Societa Lavori Edili E Serbatoi S.P.A. Procédé et système pour remonter une structure de bâtiment

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ITMI20120916A1 (it) 2013-11-29

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