EP4074910B1 - Retaining system for precast elements and manufacturing method - Google Patents

Retaining system for precast elements and manufacturing method Download PDF

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Publication number
EP4074910B1
EP4074910B1 EP22168638.9A EP22168638A EP4074910B1 EP 4074910 B1 EP4074910 B1 EP 4074910B1 EP 22168638 A EP22168638 A EP 22168638A EP 4074910 B1 EP4074910 B1 EP 4074910B1
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EP
European Patent Office
Prior art keywords
anchoring
side wall
longitudinal
retaining system
tubular section
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.)
Active
Application number
EP22168638.9A
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German (de)
English (en)
French (fr)
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EP4074910A1 (en
Inventor
Giorgio Luitprandi
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.)
Edilmatic SpA
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Edilmatic Srl
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Priority to RS20231224A priority Critical patent/RS65004B1/sr
Publication of EP4074910A1 publication Critical patent/EP4074910A1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
    • E04B1/4107—Longitudinal elements having an open profile, with the opening parallel to the concrete or masonry surface, i.e. anchoring rails
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
    • E04B1/04—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
    • E04B1/043—Connections specially adapted therefor

Definitions

  • the present invention relates to retaining or anchoring systems and devices for constraining precast elements for buildings, and in particular relates to a retaining system for precast concrete elements used in the construction of buildings.
  • the invention further relates to a method for manufacturing an anchoring insert of such a retaining system.
  • precast concrete elements or components which are assembled and constrained together to create a desired structure is known and widespread in the construction industry.
  • retaining or anchoring systems and devices are used which allow the two precast elements to be firmly and reliably connected to each other and to ensure the connection thereof even in the event of mechanical stresses to which the structure may be subjected, for example during seismic events.
  • first anchoring insert consisting of a metal open-section channel of appropriate length which is embedded in one of the two precast elements, typically the anchoring element (e.g., a pillar, a beam, etc.) and a second anchoring insert which is instead embedded in the other precast element to be retained or anchored (e.g., a facade and/or infill panel); the anchoring inserts are connected and constrained to each other by connecting means, typically screws, nuts, washers, counterplates, etc.
  • the metal open-section channel (section is intended as the cross-section of the channel according to a plane orthogonal to a longitudinal extension axis of the channel itself) is inserted and embedded in the first precast element, vertically or horizontally, so as to expose to the outside its longitudinal access opening to the internal longitudinal cavity in which a fixing means can be inserted and then locked, for example the "T" shaped head of a screw.
  • a fixing means for example the "T" shaped head of a screw.
  • the screw is then connected to the second insert to which it is fixed by one or more bolts.
  • the second anchoring insert can be made in different forms, for example by using a flat or "L” or “C” shaped metal plate, in any case provided with a hole or a through slot in which the screw stem can be engaged which is subsequently locked, for example by a nut with a washer.
  • the second anchoring insert is inserted and embedded in the concrete, in an outer edge of the element to be retained.
  • a compartment or recess is made in the outer edge of the precast element which allows the insertion of the connecting means in the assembly step.
  • the second anchoring insert is also provided with a plurality of anchoring parts, having an elongated and shaped form, which extend from the plate with slot inside the precast element to be retained, embedded in the concrete.
  • the anchoring parts are for example formed by appropriately bent metal cables or wires or by elongated and/or bent metal fins and are fixed to the plate by welding.
  • Document CN 110 761 400 A discloses a retaining system comprising the features of the preamble of claim 1.
  • Another object is to make a retaining system which is easy, quick and economical to implement and embed in the precast elements and which at the same time ensures a firm, robust and stable constraint and anchoring of the precast elements.
  • a further object is to provide a method for quickly and economically manufacturing an anchoring insert for a retaining system for precast elements, in particular concrete precast elements.
  • a first aspect of the invention includes a retaining system for precast elements according to claim 1.
  • a second aspect of the invention includes a manufacturing method of a first anchoring insert for a retaining system for precast elements according to claim 14.
  • the retaining system 1 is illustrated, which is adapted to constrain two precast elements 51, 52 for buildings, in particular two precast concrete elements.
  • the retaining system 1 comprising a first anchoring insert 2 associable with a first precast element 51, a second anchoring insert 3 associable with a second precast element 52 and connecting means 20 for connecting and constraining the anchoring inserts 2, 3 and the precast elements 51, 52 in an assembled configuration A.
  • the first precast element 51 can be the precast element to be retained or anchored and comprises, for example, a facade and/or infill panel, while the second precast element 52 can be the anchoring element and comprises, for example, a pillar, a beam, etc.
  • the second anchoring insert 3 comprises a portion of an open section channel 4 provided with a longitudinal cavity 5 accessible from the outside through a longitudinal access opening 6.
  • Section is intended as the cross-section of the channel according to a plane orthogonal to a longitudinal extension axis of the section itself.
  • the first anchoring insert 2 comprises a portion or segment 10 of a tubular section 100, which extends straight along a longitudinal extension axis X, and is provided with at least one side wall 11 which faces the longitudinal access opening 6 of the second anchoring insert 3 in the assembled configuration A and is provided with a slot 12, i.e., an elongated through opening.
  • the side wall 11 is for example substantially flat and the slot 12 extends parallel to the longitudinal extension axis X of the tubular section 100 and in the assembled configuration A is substantially orthogonal to the longitudinal cavity 5 of the second anchoring insert 3.
  • the anchoring inserts 2, 3, i.e., the open section channel 4 and the tubular section 10, are made of metal alloy, in particular steel.
  • the connecting means 20 comprise a screw 21 provided with a shaped head 22 insertable and therefore engageable, in particular by rotating the screw 21 about a respective longitudinal axis, in the longitudinal cavity 5 of the second anchoring insert 3 and a threaded stem 23 insertable and therefore lockable in the slot 12 of the first anchoring insert 2, for example by means of a washer 24 and a nut 25.
  • the portion 10 of the tubular section of the first anchoring insert 2 comprises, in addition to the side wall 11, opposite open ends 31 for access to an internal cavity 30 of the aforesaid portion 10 and further has at least one side through opening 14 which is obtained by cutting the portion 10 and is shaped so as to form at least two anchoring tubular protrusions 13, which are parallel and spaced so as to allow access to the internal cavity 30 and to an internal face 11a of the side wall 11, for the insertion of the connecting means 20 in an assembly step, as better explained below in the description.
  • the anchoring tubular protrusions 13 extend from the side wall 11 along a direction substantially orthogonal to the latter.
  • the anchoring tubular protrusions 13 comprise the open ends 31.
  • the tubular section 100 has a quadrangular cross-section, in particular rectangular (with rounded edges) and the side wall 11 is one of the two walls of smaller extent of the tubular section 100.
  • the anchoring tubular protrusions 13, in addition to being connected to the side wall 11, are connected to each other by longitudinal portions 15 of upper and lower walls of larger extent 17 of the tubular section 100.
  • the side through opening 14 is made, for example, by cutting the portion 10 of the tubular section orthogonally to a longitudinal plane M substantially orthogonal to the side wall 11 and parallel to a longitudinal extension axis X of the tubular section 100.
  • the portion 10 of the tubular section is cut, for example, along a cutting path T.
  • the side through opening 14 is made on the portion 10 of the tubular section 100 by cutting a further side wall 16 parallel and opposite the side wall 11 and two upper and lower walls 17 parallel to each other and opposite and transverse, in particular substantially orthogonal, to the side walls 11, 16.
  • the side through opening 14 is made by cutting the further side wall 16 of smaller extent, parallel and opposite the side wall 11 with slot 12 and the two upper and lower walls 17 of larger extent, parallel and opposite and substantially orthogonal to the two walls of smaller extent 11, 16.
  • the aforesaid side through opening 14 in orthogonal projection on the longitudinal plane M, i.e., in a plan view of the first anchoring insert 2 ( figure 4 ) has a substantially trapezoidal shape.
  • the plan shape of the side through opening 14 can however be different, for example rectangular, triangular, polygonal or circular or elliptical or variously shaped.
  • Each anchoring tubular protrusion 13 is connected to the side wall 11 and is thus formed by portions derived by cutting or sectioning the further side wall 16 opposite the side wall 11 and the two upper and lower walls 17.
  • the dimensions and shape of the side through opening 14 must in any case be such as to allow to make two anchoring tubular protrusions 13 having adequate resistance to mechanical stresses and at the same time form a compartment or recess 19 (once the first anchoring insert 2 is inserted in the first precast element 51, as better explained in the description below) large enough to allow to insert and operate on the connecting means 20.
  • the compartment 19 must allow an operator to insert the screw 21 through the slot 12 in the longitudinal cavity 5, rotate it to engage the shaped head 22 in the longitudinal cavity 5, then lock the screw 21 in the slot 12 by means of the washer 24 and the nut 25, suitably screwed.
  • the two anchoring tubular protrusions 13 must have adequate dimensions and resistance to mechanical stresses as they are intended to be embedded in the material (concrete) of the first precast element 51 and thus act as anchoring parts of the entire anchoring insert 2, 3 in the first precast element 51.
  • U-shaped or similar-shaped anchoring rods 40 can be inserted inside the anchoring tubular protrusions 13 which penetrate deeper into the material ( figure 2 ).
  • the open section channel 4 of the second anchoring insert 3 comprises a rear wall 7 and two opposite side walls 8 provided with respective longitudinal edges 9 bent inwards towards each other and defining the longitudinal access opening 6.
  • the rear wall 7 is opposite the access opening 6.
  • the two longitudinal edges 9 are bent towards each other so as to form with the respective side walls 8 two grooves 29 in which the shaped head 22 of the screw 21 is engaged in the assembled configuration A.
  • the shaped head 22 of the screw 21 has a "T” or “anchor” shape and when it is inserted into the longitudinal cavity 5, after being appropriately rotated, it abuts the longitudinal edges 9 of the open section channel 4 in the assembled configuration A. More precisely, the tooth ends of the "T" head 22 are inserted into the grooves 29.
  • the second anchoring insert 3 further comprises one or more anchoring pins 18, for example two, fixed to the rear wall 7 of the open section channel 4 and intended to be inserted and embedded in the material (concrete) of the second precast element 52 to increase the anchoring capacity of the second anchoring insert 3 in the second precast element 52.
  • the first anchoring insert 2 of the retaining system 1 of the invention is configured to be embedded in an outer edge 53 of the first precast element 51 so that its side wall 11 is parallel, in particular substantially coplanar, to a first wall 51a of the first precast element 51, intended to abut a second wall 52a of the second precast element 52 in the assembled configuration A, and the side through opening 14 opens onto a third wall 51b of the first precast element 51.
  • the third wall 51b of the first precast element 51 is substantially orthogonal to the first wall 51a, in particular the latter being substantially vertical.
  • the first insert 2 is provided with an occlusion element, for example made of polystyrene which is inserted inside the cavity formed in the portion 10 of the tubular section by the side through opening 14 and which prevents the entry of the concrete during the casting of the first precast element 51.
  • an occlusion element for example made of polystyrene which is inserted inside the cavity formed in the portion 10 of the tubular section by the side through opening 14 and which prevents the entry of the concrete during the casting of the first precast element 51.
  • the occlusion element can be removed to create the compartment 19 which connects to the internal cavity 30 of the portion 10 so as to allow access to the internal face 11a of the side wall 11 and therefore to insert and assemble the connecting means 20.
  • the second anchoring insert 3 is configured to be embedded in the second wall 52a of the second precast element 52 intended to abut the first wall 51a of the first precast element 51 in the assembled configuration A so that the longitudinal access opening 6 of the longitudinal cavity 5 opens onto the second wall 52a and in particular so as to extend along a substantially vertical direction.
  • a step is included for positioning the two precast elements 51, 52 so that their first and second walls 51a, 52a are facing and in particular the side wall 11 of the first anchoring insert 2 is facing the longitudinal opening 6 of the longitudinal cavity 5 of the second anchoring insert 3.
  • the screw 21 can be introduced through the internal cavity 30 of the portion 10 of the tubular section 100 and through the compartment 19, formed by the side through opening 14 of the first insert 2 on the outer edge 53 of the first precast element 51.
  • the shaped head 22 of the screw 21, through the slot 12 can be inserted into the longitudinal cavity 5 of the open section channel 4 and rotated so as to abut the longitudinal edges 9 of the latter and engage the grooves 29.
  • the screw 21 is then locked to the slot 12 of the first anchoring insert 2 by means of a washer 24 and a nut 25.
  • the screw 21 is put into traction, i.e., a tensile force is exerted which holds the two anchoring inserts and therefore the two precast elements 51, 52 together, preventing displacements along a direction orthogonal to the first and second walls 51a, 52a and along a direction parallel to the aforesaid walls 51a, 52b.
  • the slot 12 arranged substantially orthogonally to the through opening 6 allows to compensate for any positioning errors and inaccuracies of the two precast elements 51, 52 allowing a displacement of the screw 21 so that its shaped head 22 can be inserted into the longitudinal cavity 5.
  • Figures 9-12 show a variant of the retaining system 1 of the invention which differs from the above-described embodiment for the first anchoring insert 32 whose side wall 11 has a slot 42 having opposite longitudinal edges provided with teeth 43.
  • the connecting means 20 comprise a locking washer 26 provided with further teeth 27.
  • the locking washer 26 mounted on the screw 21 is partially inserted into the slot 42 so that its additional teeth 27 engage with the teeth 43 of the slot 42; such shape coupling prevents any displacement of the first anchoring insert 32 with respect to the screw 21 and therefore with respect to the second anchoring insert 3 along the slot 42 i.e., along a direction parallel to the extension direction of the slot 42.
  • the first anchoring insert 32 comprises a side through opening 44, made on the portion 10 of tubular section with rectangular channel by cutting the further side wall 16 parallel and opposite to the side wall 11 and the two upper and lower walls 17 parallel and opposite and substantially orthogonal to the side walls 11, 16.
  • the side through opening 44 has an orthogonal projection on the longitudinal plane M, i.e., in a plan view ( figure 12 ), for example, a substantially rectangular shape.
  • the retaining system 1 of the invention it is possible to quickly, simply and safely constrain two precast elements 51, 52 for buildings.
  • the two anchoring inserts 2, 3 which can be easily inserted and embedded in the precast elements 51, 52 and joined by a screw 21 with bolt 25 ensure a firm, robust and stable constraint or anchoring of the precast elements 51, 52.
  • the retaining system 1 is also quick and economical to manufacture since both anchoring inserts 2, 3 are obtained from metal sections 4, 100 available on the market.
  • the first anchoring insert 2 intended to be embedded in a precast element to be constrained or anchored, is made from a portion 10 of a tubular section 100 of suitable channel and having opposite open ends 31 for access to an internal cavity 30, making on said portion 10 in a quick and precise manner two cuts to respectively make the slot 12 on the side wall 11 and the side through opening 14, shaped so as to form the two anchoring tubular protrusions 13 and to allow access to the internal cavity 30 and to the internal face 11a of the side wall 11 for the insertion of the connecting means 20.
  • the anchoring insert 2 thus obtained, in addition of being economic to make, is particularly robust and suitable for being embedded in an outer edge of the precast element.
  • the material (concrete) during casting partially penetrates into the anchoring tubular protrusions 13.
  • the invention further comprises a method for manufacturing a first anchoring insert 2 of a retaining system 1 adapted to constrain two precast elements 51, 52 for buildings, said first anchoring insert 2 being configured to be embedded in a first precast element 51 and to be connected in an assembled configuration A by connecting means 20 to a second anchoring insert 3 of the retaining system 1 embedded in a second precast element 52.
  • the method comprises the steps of:
  • the tubular section 100 extends straight along a longitudinal extension axis X and the cross section is a channel according to a plane orthogonal to the longitudinal extension axis X.
  • Cutting transversely comprises cutting the tubular section 100 according to a plane orthogonal to the longitudinal extension axis X.
  • the portion 10 of tubular section comprises, in addition to the side wall 11, opposite open ends 31 for accessing an internal cavity 30.
  • the anchoring tubular protrusions 13 comprise the open ends 31.
  • the method includes cutting the portion 10 of the tubular section orthogonally to a longitudinal plane M substantially orthogonal to the side wall 11 and parallel to a longitudinal extension axis X of the tubular section 100.
  • it is envisaged to cut the portion 10 of tubular section along a cutting path T.
  • the side through opening 14 by cutting a further side wall 16 parallel and opposite the side wall 11 and two upper and lower walls 17 parallel and opposite and transverse, in particular substantially orthogonal, to the side walls 11, 16, of the portion 10 of tubular section 100.
  • section 100 has a rectangular section
  • the side through opening 14 in orthogonal projection on the longitudinal plane M i.e., in a plan view of the first anchoring insert 2 ( figure 4 ) has a shape between substantially rectangular, trapezoidal, triangular, polygonal, circular or elliptical or variously shaped.
  • the method further includes making the slot 12, i.e., an elongated through opening, which extends parallel to the longitudinal extension axis X of the tubular section 100.
  • the method further comprises making on opposite longitudinal edges of the slot 12 a plurality of teeth 43 configured to be engaged by further teeth 27 of a locking washer 26 of the connecting means 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
EP22168638.9A 2021-04-16 2022-04-15 Retaining system for precast elements and manufacturing method Active EP4074910B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RS20231224A RS65004B1 (sr) 2021-04-16 2022-04-15 Sistem zadržavanja za unapred izrađene elemente i postupak izrade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000009620A IT202100009620A1 (it) 2021-04-16 2021-04-16 Sistema di ritenuta per elementi prefabbricati di calcestruzzo e metodo di realizzazione

Publications (2)

Publication Number Publication Date
EP4074910A1 EP4074910A1 (en) 2022-10-19
EP4074910B1 true EP4074910B1 (en) 2023-09-20

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Application Number Title Priority Date Filing Date
EP22168638.9A Active EP4074910B1 (en) 2021-04-16 2022-04-15 Retaining system for precast elements and manufacturing method

Country Status (3)

Country Link
EP (1) EP4074910B1 (it)
IT (1) IT202100009620A1 (it)
RS (1) RS65004B1 (it)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3701530A1 (de) * 1987-01-21 1988-08-04 Fricker Siegfried Gezahnte ankerschiene
IT1319704B1 (it) * 2000-12-21 2003-11-03 Sergio Zambelli Dispositivo di ancoraggio per manufatti prefabbricati incalcestruzzo,particolarmente per la controventatura di pannelli in
DE20108339U1 (de) * 2001-05-17 2001-07-26 Pfeifer Seil- und Hebetechnik GmbH, 87700 Memmingen Verbindungselement und Betonfertigteil mit einem Verbindungselement
ITMI20050044U1 (it) * 2005-02-16 2006-08-17 Edilmatic S R L Dispositivo di ancoraggo per manufatti cementizi
US7654057B2 (en) * 2005-08-08 2010-02-02 Sergio Zambelli Anchoring insert for embedding in a concrete component and concrete component provided therewith
WO2019097471A1 (en) * 2017-11-16 2019-05-23 Newredil S.R.L Anchoring device for structural profiles
CN110761400B (zh) * 2019-10-12 2021-05-25 中民筑友科技产业有限公司 一种预制整体凸窗的连接结构及其装配方法

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Publication number Publication date
IT202100009620A1 (it) 2022-10-16
RS65004B1 (sr) 2024-01-31
EP4074910A1 (en) 2022-10-19

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