EP1573143A1 - Charpente prefabriquee a planchers multiples - Google Patents

Charpente prefabriquee a planchers multiples

Info

Publication number
EP1573143A1
EP1573143A1 EP03785882A EP03785882A EP1573143A1 EP 1573143 A1 EP1573143 A1 EP 1573143A1 EP 03785882 A EP03785882 A EP 03785882A EP 03785882 A EP03785882 A EP 03785882A EP 1573143 A1 EP1573143 A1 EP 1573143A1
Authority
EP
European Patent Office
Prior art keywords
frame structure
girder
floor frame
floor
prefabricated multi
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Withdrawn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
EP03785882A
Other languages
German (de)
English (en)
Inventor
Alberto Dal Lago
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.)
DLC SRL
Original Assignee
DLC 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
Application filed by DLC SRL filed Critical DLC SRL
Publication of EP1573143A1 publication Critical patent/EP1573143A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors
    • 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
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21—Connections specially adapted therefor
    • 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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/125—Reinforcement continuity box
    • E04G21/126—Reinforcement continuity box for cable loops

Definitions

  • the present invention relates to a prefabricated multi-floor frame structure.
  • multi-floor buildings for the tertiary sector, with each floor having a considerable surface area, in which the stair-wells/lift-units, which could serve as stiffening elements, are positioned either laterally or on the outside of the structure.
  • prefabrication techniques for multi-floor frames involve the use of hinged structures, which exploit the stiff floor obtained by casting the co-operating cap in order to transmit all the horizontal actions to the resistant sections.
  • the rigid floor is moreover made with a cooperating cast which cannot be cast, as occurs in traditional building techniques, floor by floor, but only when the structure is completely assembled.
  • assembly must be performed using a mobile crane, which has to position, for each grid, girders and floors at the various floors, before passing on to the next grid.
  • the assembly stage proves critical because the conventional actions that are to be expected according to current standards during assembly do not in general encounter stiffening cores nor, even if there were any, are the structural connections to these possible, hence imposing the need for the structure to be calculated as a hinged frame without bracings with considerable stresses at the foot of the pillars, due to the cantilever-like operation of the individual pillar, with inevitable problems of instability and of second-order moments, and with consequent large dimensions of the pillars.
  • the general purpose of the present invention is to overcome the drawbacks of the known art referred to above, in an extremely simple, inexpensive and particularly functional way, i.e., providing a frame structure in the two directions (i.e., not only in the direction of the girders, but also in the direction of the floors) , which, exploiting a first-phase joint, provides fixed-end nodes in order to guarantee stability and containment of the strains in the assembly stage, and which, once assembly is completed, with the second-phase joint made with additional reinforcement in the integrative castings, will be able to withstand actions during use, with the result of having smaller dimensions of the pillars, reduced heights of the floor system, contained strains of the frame, and elimination of the bracing cores.
  • FIG. 1 is a plan view of a prefabricated multi-floor frame structure according to the present invention.
  • - Figure 2 is a cross-sectional view according to the trace II-II of Figure 1 of a frame structure according to the present invention
  • - Figure 3 is a cross-sectional view according to the trace III-III of Figure 1 of a frame structure according to the present invention
  • FIG. 4 is an enlarged partial perspective view of the pillar-capital-girder node of a frame structure according to the invention.
  • Figure 5 is a view similar to the one illustrated in Figure 4, enlarged and partially exploded;
  • Figure 6 is a vertical cross section according to the trace VI-VI of Figure 7 of a box girder according to the invention
  • Figure 7 is a detail in plan view, illustrating a central capital and a box girder
  • FIG. 8 is an enlarged sectioned plan view illustrating the first-phase joint obtained by means of a pin and loops of harmonic wire between the capital and the girder;
  • Figure 9 is a sectioned elevation of the joint illustrated in Figure 8.
  • Figure 10 is a perspective, partially cutaway and sectioned view of the frame structure according to the invention.
  • a prefabricated multi-floor frame structure is designated, as a whole, by 10, and, as illustrated in the example according to the present invention, comprises, in general, pillars 11, girders 12 and tiles 13, connected together in order to form a prefabricated structure with fixed-end nodes.
  • the pillars 11 are full-height pillars, having a shaft with constant cross section and with current reinforcement. Internal points of lightening, where the axial load is reduced, and insertion of steel profiles in the bottom part, where the axial load is high, enable sizing of the shaft within small dimensions that are maintained constant throughout the entire height. Fitted on the shaft are cross capitals 14, on which there is fixed a box girder 12.
  • the cross capital 14 of the central pillars can adapt its height and width to the height and width of the girder until it becomes, with displacement the separator on the formwork, a cantilever capital or a collar capital 21 of the side pillars 11.
  • the first-phase joint is made in the assembly stage, for example by inserting a pin 15 into two loops overlaid with harmonic wire 16, and by injecting into said connection a fast-hardening additivated concrete.
  • a fixed-end joint there is obtained a fixed-end joint, the purpose for this being to obtain in all cases a frame structure with fixed-end nodes in the two directions as it is assembled so as to guarantee structural stability and containment of strains, and so that, in use, once the assembly is completed, with the second-phase reinforcements 18 inserted in the integrative castings, it may provide a frame structure with fixed-end nodes capable of withstanding, with limited strains, the working loads and the horizontal actions of the wind or of an earthquake.
  • the primary and secondary elements should be possible with a minimal rise that remains stable over time; the moment of the secondary elements (floors) should be transferred onto the pillar 11 via a high torsional inertia of the primary elements (girders) ; and
  • the secondary elements which can be set at a distance from one another, should be torsionally rigid in order to prevent transverse flexibility of the floor.
  • the above requirements may be obtained via a particular hollow box girder 12 which can be produced using the same techniques and same equipment used for making the hollow floor.
  • the box girder is characterized by an internal hole of fixed width, with two ribs having a thickness that can vary according to the shear and a pre-compression designed in such a way that the strains are small and above all stable over time so that, under dead loads, there do not occur viscous rotations on the supports with burdensome transfer of moments from positive to negative over time.
  • the girder is characterized by:
  • first-phase joint which, at the moment of assembly provides a fixed-end joint, said first- phase joint being sized for making a frame structure resistant to the vertical and horizontal actions expected in the assembly stage; a second-phase joint for absorbing high fixed-end moments, in use, this being obtained with steel bars integrated with the reinforcement of the first-phase joint, which are positioned on the integrative casting in positions corresponding to the ribs;
  • the bottom first-phase joint is made immediately after laying of the element, by forming a hinge-like constraint, whilst the top joint can also be made when assembly of the individual grid is completed.
  • the top joint which is already stressed by the added dead loads requires an increase in the reinforcement 18, which is sized according to the maximum negative moments and is inserted in a cooperating cap 20.
  • the loop 16 of the top first-phase joint which both for the girder 12 and for the floor elements is made with harmonic wire, is stressed by the permanent loads at the moment of assembly and by the horizontal actions, which, during assembly, are imposed by standards .
  • the harmonic wire is hence able to respond to the increase in additional stresses of the overloadings, which are simultaneously absorbed also by the reinforcements 24 inserted in the second-phase co-operating cap 20, thus possibly constituting a sort of pre-stressing of the harmonic wire for its complete exploitation.
  • the harmonic wire which is pre-stressed by the dead loads, is thus able to co-operate also for the maximum live loads together with the additional reinforcements .
  • the frame structure with fixed-end nodes requires that the stair wells and lift shafts should not be stiffening structures, and could hence be prefabricated elements mounted on top of one another with interposition of a neoprene support in a position corresponding to the newel posts so as to prevent the well or shaft from presenting excessive stiffness.
  • a prefabricated multi-floor frame structure with fixed-end nodes provides structural stability during assembly, enables reduction in the dimensions of the pillars and in the thickness of the floor system, contains the strains of the frame, and does not require bracing cores. The purpose mentioned in the preamble of the description is therefore achieved.
  • the modalities for obtaining the first-phase joints in the prefabricated multi-floor frame structure according to the invention may differ from the ones illustrated purely by way of non-limiting example in the drawings, as may likewise differ the materials employed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

Une structure de charpente préfabriquée comprend, d'une manière générale, des piliers (11), des poutres orientées dans une direction (12) et des tuiles orientées dans une autre direction (13), lesdits éléments étant reliés entre eux de manière à former une structure préfabriquée. Selon l'invention, cette structure détermine une charpente comportant des noeuds aux extrémités fixes orientés dans deux directions, les joints de première phase étant fabriqués au stade d'assemblage, et les renforts d'intégration de deuxième phase étant disposés sous le couvercle qui interagit avec la charpente.
EP03785882A 2002-12-19 2003-12-12 Charpente prefabriquee a planchers multiples Withdrawn EP1573143A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20020269 2002-02-12
IT002690A ITMI20022690A1 (it) 2002-12-19 2002-12-19 Struttura a telaio multipiano prefabbricato
PCT/EP2003/014546 WO2004057125A1 (fr) 2002-12-19 2003-12-12 Charpente prefabriquee a planchers multiples

Publications (1)

Publication Number Publication Date
EP1573143A1 true EP1573143A1 (fr) 2005-09-14

Family

ID=32676843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03785882A Withdrawn EP1573143A1 (fr) 2002-12-19 2003-12-12 Charpente prefabriquee a planchers multiples

Country Status (4)

Country Link
EP (1) EP1573143A1 (fr)
AU (1) AU2003294906A1 (fr)
IT (1) ITMI20022690A1 (fr)
WO (1) WO2004057125A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2879636B1 (fr) * 2004-12-21 2007-02-23 Conseil Service Investissement Ensemble de soutien d'une dalle et procede de realisation d'une telle dalle
CN101812869B (zh) * 2010-04-02 2012-06-20 清远市建巢工业设计有限公司 一种建筑用预制钢筋混凝土单元体及其预制方法
JP6388840B2 (ja) * 2015-03-12 2018-09-12 三井住友建設株式会社 柱梁接合構造およびその施工方法
JP6712448B2 (ja) * 2015-08-20 2020-06-24 株式会社安藤・間 鉄筋コンクリート柱梁接合部プレキャスト部材

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938458A (en) * 1909-04-08 1909-11-02 Carl E Brockhausen Concrete construction.
GB630207A (en) * 1946-09-25 1949-10-07 Henry George Hayes Improvements in or relating to building construcition
US3918222A (en) * 1974-06-03 1975-11-11 Bahram Bahramian Prefabricated modular flooring and roofing system
CH598433A5 (fr) * 1976-07-28 1978-04-28 Camazet Ag
IT1266784B1 (it) * 1993-11-09 1997-01-21 Dlc Srl Solaio industriale prefabbricato

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2004057125A1 *

Also Published As

Publication number Publication date
WO2004057125A1 (fr) 2004-07-08
AU2003294906A1 (en) 2004-07-14
ITMI20022690A1 (it) 2004-06-20

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