EP4053359A1 - Vérin adapté pour être inséré dans l'épaisseur d'un élément structurel, et procédé d'insertion dudit vérin dans ledit élément structurel - Google Patents

Vérin adapté pour être inséré dans l'épaisseur d'un élément structurel, et procédé d'insertion dudit vérin dans ledit élément structurel Download PDF

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Publication number
EP4053359A1
EP4053359A1 EP22160247.7A EP22160247A EP4053359A1 EP 4053359 A1 EP4053359 A1 EP 4053359A1 EP 22160247 A EP22160247 A EP 22160247A EP 4053359 A1 EP4053359 A1 EP 4053359A1
Authority
EP
European Patent Office
Prior art keywords
plate
jack
longitudinal direction
guide
along
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.)
Granted
Application number
EP22160247.7A
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German (de)
English (en)
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EP4053359B1 (fr
EP4053359C0 (fr
Inventor
Ivo Vanzi
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Next Innovation In Engineering Srl
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Next Innovation In Engineering Srl
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Publication of EP4053359A1 publication Critical patent/EP4053359A1/fr
Application granted granted Critical
Publication of EP4053359B1 publication Critical patent/EP4053359B1/fr
Publication of EP4053359C0 publication Critical patent/EP4053359C0/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0229—Increasing or restoring the load-bearing capacity of building construction elements of foundations or foundation walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them

Definitions

  • This invention lies, in general, within the construction sector; in particular, the invention relates to a jack which is adapted to be inserted into the thickness of a structural element, and a process for inserting said jack into said structural element.
  • Known hydraulic jacks are adapted to be inserted into the thickness of a structural element (a beam, post or pillar) in order to locally discharge the tensions of the material, and make one or more holes in this material.
  • the jacks are therefore responsible for compensating for the local increase in tensions that is caused by removing the material from the structural element.
  • hydraulic jacks may burst. They are low-reliability systems for such delicate work. The loss of a jack would in fact cause a post to break.
  • hydraulic jacks require significant volumes of the continuum to be demolished.
  • the variation in the tensional state in the continuum of the material is not negligible for the operations of inserting hydraulic jacks.
  • jacks which utilize the mutual sliding of wedge-shaped portions in order to mutually lift structural elements. These devices are designed to be arranged horizontally between the two elements, thus causing one to be gradually lifted/lowered with respect to the other, and are typically used when a beam or girder is intended to be placed on a post in a controlled manner, or a wall portion is intended be supported on a lintel.
  • the object of this invention is to overcome the aforementioned problems.
  • the prismatic guide is adapted to abut against a wall of a seat made in the material of the structural element into which the jack is inserted.
  • this is therefore a system based on the wedge effect (which may be assisted by thermal dilation imposed on the plate of the jack) that is adapted to divert the flow of tensions in a continuous (or non-continuous), elastic or non-elastic medium in the desired manner.
  • this is a system adapted to divert compression isostatics by transferring them from volumes of the continuum that are intended to be discharged by compression or other volumes of the same continuum.
  • known hydraulic jacks may exert tensions in the tens of MPa, whereas a jack according to this invention may exert tensions in the hundreds of MPa.
  • a method for inserting a jack into a structural element includes the step of coring the concrete above and below the jack, thus creating a cut having a suitable thickness for said jack to be inserted therein (for example equal to 30 mm); the cylindrical guide(s) (preferably made of aluminum) are then inserted into the holes, and the plate of the jack is inserted into the tracks made in said cylinders and is clamped therein by a screw system inside the tracks; the concrete is thus discharged (in this step, the jack acts as a wedge).
  • the plate and/or the prismatic guides are advantageously cooled before their insertion or heated afterwards.
  • the temperature of the jacks to change from the initial temperature (for example approximately -20 °C, which may be achieved by keeping the plate in a freezer before insertion into the guides) to the ambient temperature, for example 20°.
  • the thermal gradient causes dilation of the jack and further discharge of tensions of the concrete.
  • the thermal gradient may also be increased by bringing the jack to temperatures less than -20° before insertion and/or by bringing the jack to temperatures greater than ambient temperature after insertion.
  • electrical resistors may be inserted into the jack.
  • the concrete between two jacks is discharged and may be removed.
  • a seismic isolator may be inserted, for example, and the jacks are then discharged and the two remaining parts of concrete cover are cut.
  • reinforcements formed by a piece of C-shaped steel and threaded bars may be present.
  • the C shapes confine the concrete and divert the flow of tensions in the desired manner.
  • a jack according to this invention may be successfully used to insert anti-seismic isolators inside posts of buildings made of reinforced concrete or in posts of bridges (for example to create manholes, if not already present, in hollow bridge posts or in the caissons of bridge decks), or to demolish wall screw taps in masonry buildings, in order to prevent vertical movements at the upper levels and subsequent damage, or even breakage, of structural elements (floor beams) and non-structural elements (floors, windows, doors).
  • a jack according to this invention may also be advantageously used to demolish elements made of concrete or reinforced concrete, even in difficult working conditions, for example to demolish foundations in underwater works, tunnel linings, and small buildings.
  • a jack 9 which is adapted to be inserted into the thickness of a structural element P and to divert the flow of tensions in the material thereof comprises a plate 10 which includes a pair of faces having a trapezoidal profile, which faces are parallel to one another and transversely spaced by a thickness of the plate 10, said plate 10 being designed to be inserted into a vertical slit made in the structural element P.
  • the jack 9 also comprises at least one guide 12 in the form of a prism or cylinder elongated along a longitudinal direction and comprising a groove 14 which is extended along this longitudinal direction and adapted to slidably receive an oblique side of said plate 10.
  • the 'longitudinal direction' may advantageously be understood to mean a direction extending between the longer base and the smaller base of the trapezoidal faces, and/or a direction in which the jack 9 is inserted into the relevant vertical slit made in the structural element P.
  • the 'oblique side' of said plate 10 may advantageously be understood to mean a perimeter face of this plate 10 that is formed by the thickness thereof along an oblique joining line between the longer and smaller bases of the parallel faces of the plate 10.
  • the guide 12 is preferably designed as a cylinder extended along this longitudinal direction and having an at least partly circular cross section.
  • the groove 14 advantageously has a constant cross section along said longitudinal direction.
  • the groove 14 has a decreasing cross section along said longitudinal direction, complementary to the profile of the oblique side of the plate 10 that is able slide within said groove 14.
  • the plate 10 may have a right trapezoidal profile (i.e. may have three sides consecutively perpendicular to each other and only one oblique side).
  • the cross section of the plate 10 along the longitudinal direction is instead isosceles trapezoidal (i.e. with a longer base in the wider cross section, a smaller base spaced apart from the longer base along said longitudinal direction, and two oblique sides converging from the longer base towards the smaller base).
  • the jack 9 also comprises a pair of guides 12 arranged symmetrically with respect to a longitudinal center line of the plate 10, the oblique sides of said plate 10 being slidably received in respective guides 12.
  • the jack 9 preferably also comprises a tie rod 16 connected to the plate 10 and to at least one guide 12, this tie rod 16 being adapted to pull the plate 10 and the guide 12 towards each other such that the plate 10 slides inside the groove 14 of the guide 12.
  • the tie rod 16 may comprise a bracket 18 which abuts against the transverse thickness of the longer base of the plate 10, a threaded rod 20 which engages at one end with said bracket 18 and at the other end with a relevant guide 12, and a pusher 22 which is adapted to slide the bracket 18 along the threaded rod 20 so as to push the plate 10 towards said guide 12.
  • the plate 10 comprises a coil adapted to exchange heat with said plate 10.
  • a process for removing a portion of material from a structural element P comprises the steps of:
  • Step b) above is carried out by providing jacks 9 which each comprise a plate 10 having a trapezoidal cross section along a longitudinal direction, and at least one guide 12 in the form of a prism or cylinder elongated along said longitudinal direction and comprising a groove 14 which is extended along said longitudinal direction, the plate 10 being slidably received within said groove 14 along an oblique side of said plate 10, and/or by providing jacks 9 which each comprise a plate 10 that includes a pair of faces having a trapezoidal profile (which faces are parallel to one another and transversely spaced apart by a thickness of the plate 10), and at least one guide 12 in the form of a prism or cylinder elongated along a longitudinal direction and comprising a groove 14 which is extended along this longitudinal direction and adapted to slidably receive an oblique side of said plate 10.
  • Step b) above is advantageously preceded by a step of cooling the plate 10 and/or is followed by a step of heating the plate 10.
  • Step e) may be followed by the step of removing the jacks 9, thus gradually discharging the material surrounding the slits.
  • a seismic isolator 15 inside the cavity formed in the structural element P by the removal of the material, which seismic isolator is for example an elastomeric isolator or a curved surface isolator, sliding flat surface isolator, sliding pendulum isolator, etc.
  • Elastomeric isolators for example, are typically composed of a series of steel plates separated by layers of elastomeric material (rubber) that have been bonded by vulcanization.
  • seismic isolators 15 are adapted to decrease the accelerations to which the construction is subjected by means of two factors, namely an increase in the fundamental period of vibration, and an increase in energy dissipation (damping). Therefore, the jacks 9 and the portions of the structural element P to the sides of the seismic isolator 15 may be removed, so as to create a complete break of continuity vertically in the material of the structural element P. The seismic isolator 15 is loaded accordingly.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Pens And Brushes (AREA)
EP22160247.7A 2021-03-04 2022-03-04 Vérin adapté pour être inséré dans l'épaisseur d'un élément structurel, et procédé d'insertion dudit vérin dans ledit élément structurel Active EP4053359B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000005075A IT202100005075A1 (it) 2021-03-04 2021-03-04 Martinetto, atto ad essere inserito nello spessore di un elemento strutturale, e procedimento per l’inserimento di tale martinetto in tale elemento strutturale

Publications (3)

Publication Number Publication Date
EP4053359A1 true EP4053359A1 (fr) 2022-09-07
EP4053359B1 EP4053359B1 (fr) 2024-02-28
EP4053359C0 EP4053359C0 (fr) 2024-02-28

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Family Applications (1)

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EP22160247.7A Active EP4053359B1 (fr) 2021-03-04 2022-03-04 Vérin adapté pour être inséré dans l'épaisseur d'un élément structurel, et procédé d'insertion dudit vérin dans ledit élément structurel

Country Status (2)

Country Link
EP (1) EP4053359B1 (fr)
IT (1) IT202100005075A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07166514A (ja) 1993-10-20 1995-06-27 Matsuo Eng Kk 橋梁等の扛上支持方法並びに支承装置
JPH10184032A (ja) * 1996-12-24 1998-07-14 Kumagai Gumi Co Ltd 既存建築物の免震工法及び免震装置
JPH1150675A (ja) * 1997-08-06 1999-02-23 Taisei Corp 構造物の改修方法
JP2000086169A (ja) * 1998-09-17 2000-03-28 Haruo Nonaka 減速ギア式楔形ジャッキ装置及び反力導入装置
US20040000103A1 (en) * 2002-06-26 2004-01-01 Ching-Shyang Chen Earthquake energy eliminator
DE20317225U1 (de) 2003-11-08 2004-01-08 Schöck Entwicklungsgesellschaft mbH Bauelement zur Druckkraftübertragung und Vorrichtung zur Einbringung einer Vorspannung zwischen zwei Gebäudeteile
KR20040069098A (ko) 2003-01-28 2004-08-04 학교법인 울산공업학원 인상체 인상용 잭

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07166514A (ja) 1993-10-20 1995-06-27 Matsuo Eng Kk 橋梁等の扛上支持方法並びに支承装置
JPH10184032A (ja) * 1996-12-24 1998-07-14 Kumagai Gumi Co Ltd 既存建築物の免震工法及び免震装置
JPH1150675A (ja) * 1997-08-06 1999-02-23 Taisei Corp 構造物の改修方法
JP2000086169A (ja) * 1998-09-17 2000-03-28 Haruo Nonaka 減速ギア式楔形ジャッキ装置及び反力導入装置
US20040000103A1 (en) * 2002-06-26 2004-01-01 Ching-Shyang Chen Earthquake energy eliminator
KR20040069098A (ko) 2003-01-28 2004-08-04 학교법인 울산공업학원 인상체 인상용 잭
DE20317225U1 (de) 2003-11-08 2004-01-08 Schöck Entwicklungsgesellschaft mbH Bauelement zur Druckkraftübertragung und Vorrichtung zur Einbringung einer Vorspannung zwischen zwei Gebäudeteile

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Publication number Publication date
EP4053359B1 (fr) 2024-02-28
IT202100005075A1 (it) 2022-09-04
EP4053359C0 (fr) 2024-02-28

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