EP3158138A1 - A joint between beam elements and column elements made of prefabricated reinforced concrete - Google Patents

A joint between beam elements and column elements made of prefabricated reinforced concrete

Info

Publication number
EP3158138A1
EP3158138A1 EP15808789.0A EP15808789A EP3158138A1 EP 3158138 A1 EP3158138 A1 EP 3158138A1 EP 15808789 A EP15808789 A EP 15808789A EP 3158138 A1 EP3158138 A1 EP 3158138A1
Authority
EP
European Patent Office
Prior art keywords
column
joint
reinforcement
rods
prefabricated
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
EP15808789.0A
Other languages
German (de)
French (fr)
Other versions
EP3158138B1 (en
Inventor
Bruno Pasqualini
Marco GIANESINI
Santino GENTILE
Valerio COLONE
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.)
Technip Energies Italy SpA
Original Assignee
Technip Italy SpA
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 Technip Italy SpA filed Critical Technip Italy SpA
Priority to PL15808789T priority Critical patent/PL3158138T3/en
Publication of EP3158138A1 publication Critical patent/EP3158138A1/en
Application granted granted Critical
Publication of EP3158138B1 publication Critical patent/EP3158138B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs

Definitions

  • the present invention basically relates to the sector of prefabricated buildings, and in particular regards a new type of joint between beam and column elements made of prefabricated reinforced concrete, characterized by a great ease of laying in situ and provision of the formwork in which the concrete for completing the joint itself is poured.
  • Another type of beam-column joint is also known, the main difference of which with respect to the joint forming the subject of the present invention lies in the fact that it does not envisage the shoulders, and the cast is entirely contained by the formwork purposely provided in situ. In this case, there exists an evident practical difficulty of supporting the beam element before casting, so much so that the only application that is known is in experiments aimed at establishing the effectiveness of the transfer of the stresses between the re-rods, by means of the U-shaped configuration.
  • Figure 1A is a 3D view with the reinforcements visible in through view, of the ends of a prefabricated beam and of a pre-fabri cated column according to the present invention, during the step of constitution of the joint;
  • Figure IB is a view, not of a see-through type, corresponding to the previous one;
  • Figure 2A is a see-through view from above of the stretches of beam and column of Figure 1;
  • Figure 2B is a view, not of a see-through type, corresponding to the previous one;
  • Figures 3A and 4A corresponding to Figures 1 and 2 respectively, show in see-through view the beam and the column once assembly in situ of the joints is completed;
  • Figures 3B and 4B are views, not of a see-through type, corresponding to the previous ones.
  • the joint is basically made up of:
  • the beam in question typically has a rectangular section.
  • the cross section of the prefabricated beam T widens gradually and then divides into two prismatic elements with narrow rectangular cross section, referred to hereinafter as shoulders S that form an edge for containment (formwork) of the subsequent casting.
  • the reinforcement is provided, made up of the longitudinal horizontal rods 1, which end in a U, and of the brackets 2, which are temporarily set up against one another at the inner end of the beam T and then, after the beam has been placed in situ on the column C, are designed to be arranged around the horizontal longitudinal rods 1 of the beam T and 3 of the column C, in their position predefined in the reinforced- concrete structural design stage.
  • the dimension in length of the compartment L depends upon the diameter of the reinforcement chosen ( ⁇ ) , as illustrated in Table 1 provided below.
  • a continuity reinforcement made up of rods 3 bent to form a U having the same diameter and position as the rods 1 projecting from the beam T but translated horizontally in a lateral direction with respect to the latter, just enough to enable interpenetration of this reinforcement 3 of the column C with the reinforcement 1 of the beam T, with the due constructional tolerances as illustrated in Figure 1.
  • the rods 3 bent to form a U projecting from the column C extend in length for a stretch LU from the extrados of the column C as defined in Table 1.
  • LU is the extension of the rods or (or bars) 1 or 3 outside the column C or the beam T;
  • LI is the length of i nterpenetrati on of the rods (or bars) 1 and 3;
  • L is the length of the compartment that contains the reinforcement of the joint to be cast in situ.
  • the column C also comprises means for temporarily supporting the prefabricated beam T during i nstal 1 ati on .
  • said supporting means are constituted, purely by way of example, by a short cantilever M cast together with the column C, on which cantilever the shoulders S of the beam T are rested.
  • the brackets 2 of the reinforcement are translated into their position envisaged in the structural design.
  • the length of said cantilever M is such as to enable the operators to gain access to the compartment between the shoulders S also from beneath so as to facilitate the operations of positioning of the brackets 2 along said reinforcements 1 and 3.
  • Casting is hence completed with a compensated- shrinkage self-levelling concrete, compounded with aggregate with a maximum grain size of 10 mm, preferably fibre-reinforced in the percentage of 0.5 vol%, the characteristic strength of which is equal to or higher than 1.65 times the characteristic strength of the concrete used for prefabri cati on of the beam.
  • rods of the reinforcements 1 and 3 of the beams T and of the columns C may also not be curved to form a U and may be rectilinear and joined by joining means of a known type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

A joint between beam elements (T) and column elements (C) made of prefabricated reinforced concrete, basically comprises: a portion prefabricated with the beam (T), equipped with projecting reinforcement rods (1); a portion prefabricated with the column (C), equipped with projecting reinforcement rods (3); and a portion that can be completed in situ. According to the invention, the cross section of the prefabricated beam (T), at the joint, widens gradually so that it is then divided into two prismatic elements with narrow rectangular cross section, referred to as shoulders (S), which define a containment compartment, i.e., a formwork, for the subsequent casting.

Description

A JOINT BETWEEN BEAM ELEMENTS AND COLUMN ELEMENTS MADE OF PREFABRICATED REINFORCED CONCRETE
The present invention basically relates to the sector of prefabricated buildings, and in particular regards a new type of joint between beam and column elements made of prefabricated reinforced concrete, characterized by a great ease of laying in situ and provision of the formwork in which the concrete for completing the joint itself is poured.
Currently, there exists a type of beam-column joint that may seem similar to the joint according to the present invention, in so far as the beam is equipped with lateral end shoulders for lateral containment of the casting of the concrete that constitutes the joint, but the main difference lies in the fact that - in the known case - the current cross section of the beam is defined by the extrados of the shoulders, without any narrowing of section of the beam outside the joint.
Another type of beam-column joint is also known, the main difference of which with respect to the joint forming the subject of the present invention lies in the fact that it does not envisage the shoulders, and the cast is entirely contained by the formwork purposely provided in situ. In this case, there exists an evident practical difficulty of supporting the beam element before casting, so much so that the only application that is known is in experiments aimed at establishing the effectiveness of the transfer of the stresses between the re-rods, by means of the U-shaped configuration.
These different characteristics of construction, in addition to the differences of a geometrical nature, cause, especially in the first case of the known art, a substantial waste of concrete. Furthermore, in the cases referred to above it is difficult to position and support the beam conveniently during installation, and the joints that can thus be obtained do not enable restoring of the continuity of the frame in an economically advantageous way.
There is also known, from the document No. JP 2012 144936, a beam-column joint made of pre-f abri cated reinforced concrete, in which - unlike the present invention - the re-rods are constituted by simple rectilinear lengths of iron having an anchorage head to be inserted in the joint through holes provided after installation of the beam on the column. Furthermore, unlike the present invention, in the joint described in the document No. JP 2012 144936 the pre-fabri cated beam is closed on three sides at the joint, and hence there cannot be rods projecting from the column, but only rectilinear lengths of iron to be inserted in the joint afterwards.
A better understanding of the invention will be obtained from the ensuing detailed description and with reference to the attached drawings, which illustrate, purely by way of non-limiting example, a preferred embodiment.
In the drawings:
Figure 1A is a 3D view with the reinforcements visible in through view, of the ends of a prefabricated beam and of a pre-fabri cated column according to the present invention, during the step of constitution of the joint;
Figure IB is a view, not of a see-through type, corresponding to the previous one;
Figure 2A is a see-through view from above of the stretches of beam and column of Figure 1;
Figure 2B is a view, not of a see-through type, corresponding to the previous one;
Figures 3A and 4A, corresponding to Figures 1 and 2 respectively, show in see-through view the beam and the column once assembly in situ of the joints is completed; and
Figures 3B and 4B are views, not of a see-through type, corresponding to the previous ones.
In structural terms, the characteristics of constraint that the joint guarantees are those of a perfect fixed joint.
In the preferred embodiment described herein, the joint is basically made up of:
1. a portion prefabricated with the beam T;
2. a portion prefabricated with the column C; and
3. a portion that can be completed in situ.
1. PORTION PREFABRICATED WITH THE BEAM
The beam in question typically has a rectangular section.
The section of the beam T outside the joint will be referred to in what follows as "calculation cross section" .
According to a peculiar feature of the invention, at the joint, the cross section of the prefabricated beam T widens gradually and then divides into two prismatic elements with narrow rectangular cross section, referred to hereinafter as shoulders S that form an edge for containment (formwork) of the subsequent casting. In the space thus created, which according to the invention has the same cross section as the "calculation cross section", just the reinforcement is provided, made up of the longitudinal horizontal rods 1, which end in a U, and of the brackets 2, which are temporarily set up against one another at the inner end of the beam T and then, after the beam has been placed in situ on the column C, are designed to be arranged around the horizontal longitudinal rods 1 of the beam T and 3 of the column C, in their position predefined in the reinforced- concrete structural design stage.
The dimension in length of the compartment L depends upon the diameter of the reinforcement chosen (Φ) , as illustrated in Table 1 provided below.
2. PORTION PREFABRICATED WITH THE COLUMN
Provided on the column C, in the position where the beam T is rested thereon, is a continuity reinforcement made up of rods 3 bent to form a U having the same diameter and position as the rods 1 projecting from the beam T but translated horizontally in a lateral direction with respect to the latter, just enough to enable interpenetration of this reinforcement 3 of the column C with the reinforcement 1 of the beam T, with the due constructional tolerances as illustrated in Figure 1. The rods 3 bent to form a U projecting from the column C extend in length for a stretch LU from the extrados of the column C as defined in Table 1.
TABLE 1
The dimensions provided are valid for concrete for joints with f'c = 49 MPa.
In the table:
LU is the extension of the rods or (or bars) 1 or 3 outside the column C or the beam T;
LI is the length of i nterpenetrati on of the rods (or bars) 1 and 3; and
L is the length of the compartment that contains the reinforcement of the joint to be cast in situ.
To obtain the dimensions with different values of strength it is necessary to multiply LI by the ratio 7/sqrt(f'c) and update L and LU accordingly.
The column C also comprises means for temporarily supporting the prefabricated beam T during i nstal 1 ati on .
In the preferred embodiment described herein, said supporting means are constituted, purely by way of example, by a short cantilever M cast together with the column C, on which cantilever the shoulders S of the beam T are rested. 3. PORTION THAT CAN BE COMPLETED IN SITU
Once the beam T has been set in its final position, on the provisional supporting means constituted by the above cantilever M, the brackets 2 of the reinforcement are translated into their position envisaged in the structural design.
According to a further peculiar feature of the invention, the length of said cantilever M is such as to enable the operators to gain access to the compartment between the shoulders S also from beneath so as to facilitate the operations of positioning of the brackets 2 along said reinforcements 1 and 3.
Once the bottom of the compartment, confined in which are the reinforcements 1 and 3 and the corresponding brackets 2 of the joint, is closed, a provisional formwork is anchored to the shoulders S.
Casting is hence completed with a compensated- shrinkage self-levelling concrete, compounded with aggregate with a maximum grain size of 10 mm, preferably fibre-reinforced in the percentage of 0.5 vol%, the characteristic strength of which is equal to or higher than 1.65 times the characteristic strength of the concrete used for prefabri cati on of the beam.
Finally, it should be noted that the rods of the reinforcements 1 and 3 of the beams T and of the columns C may also not be curved to form a U and may be rectilinear and joined by joining means of a known type.

Claims

1. A joint between beam elements (T) and column elements (C) made of prefabricated reinforced concrete, characterized in that it basically compri ses :
A) a portion prefabricated with the beam (T) , equipped with U-shaped projecting reinforcement rods (1) ;
B) a portion prefabricated with the column (C) , equipped with U-shaped projecting reinforcement rods (3), which can be set alongside said reinforcement rods (1) of the beam (T) ; and c) a portion that can be completed in situ;
wherein the cross section of the prefabricated beam (T) , at the joint, widens gradually so that it then divides into two prismatic elements with narrow rectangular cross section, referred to as shoulders (S) , which define a containment compartment, i.e., a formwork, for the subsequent casting; said containment compartment being accessible and open at the top, at the bottom, and at the front side facing the column (C) , wherein said U-shaped re-rods (1 and 3) are arranged in mutually parallel vertical planes.
2. The joint according to Claim 1, characterized in that in the space between the shoulders (S) , which has the same cross section as the beam (T) outside the joint, only one reinforcement is provided in the beam (T) , said reinforcement being made up of longitudinal horizontal rods (1), which end in a U, and of brackets (2).
3. The joint according to Claim 2, characterized in that provided on the column (C) , in the position where the beam (T) is rested thereon, is a continuity reinforcement made up of rods (3) bent to form a U, which have the same diameter and the same position as the rods (1) of the beam (T) but are translated horizontally in a lateral direction with respect to the latter, to enable this reinforcement (3) of the column (C) and the reinforcement (1) of the beam (T) to interpenetrate.
4. The joint according to Claim 3, characterized in that the rods (3) bent to form a U of the column (C) extend in length from the extrados of the column (C) for a stretch (LU) that is a function of the length of overlapping (LI) of the rods (1 and 3).
5. The joint according to Claim 4, characterized in that the portion of the joint prefabricated with the column (C) also comprises means for temporarily supporting the prefabricated beam (T) during installation, such as for example, a short cantilever (M) cast together with the column (C) , said cantilever functioning as resting surface for the shoulders (S) of the beam (T) .
6. The joint according to Claim 5, characterized in that said portion that can be completed in situ envisages that, for closing the bottom of the compartment defined by said shoulders (S) and by the short cantilever (M) in which the reinforcements (1 and 3) of the beam (T) and of the column (C) are confined, as well as the corresponding brackets (2) of the reinforcement of the joint that are located in their position envisaged by the structural design, a provisional formwork is provided, which is anchored to the shoulders (S) .
7. The joint according to Claim 6, characterized in that it envisages a completion casting with a compensated-shri nkage sel f-1 evel 1 i ng concrete.
8. The joint according to Claim 7, characterized in that said concrete is compounded with aggregate of maximum grain size of 10 mm, preferably fibre- reinforced with a fibre content of 0.5 vol%, the characteristic strength of which is equal to or higher than 1.65 times the characteristic strength of the concrete used for prefabri cation of the beam (T) .
9. The joint according to Claim 6, characterized in that the length of said cantilever (M) is such as to enable the operators to gain access to the compartment between the shoulders (S) also from beneath so as to facilitate the operations of positioning of the brackets (2) along said reinforcements (1 and 3) when the beam (T) is positioned on the column (C) .
10. The joint according to Claim 8 or Claim 9, characterized in that the dimension in length (L) of the compartment depends upon the diameter of the reinforcement chosen (Φ) , as illustrated in the table bel ow:
EP15808789.0A 2014-11-04 2015-11-04 A joint between beam elements and column elements made of prefabricated reinforced concrete Active EP3158138B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15808789T PL3158138T3 (en) 2014-11-04 2015-11-04 A joint between beam elements and column elements made of prefabricated reinforced concrete

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20140640 2014-11-04
PCT/IB2015/058518 WO2016071847A1 (en) 2014-11-04 2015-11-04 A joint between beam elements and column elements made of prefabricated reinforced concrete

Publications (2)

Publication Number Publication Date
EP3158138A1 true EP3158138A1 (en) 2017-04-26
EP3158138B1 EP3158138B1 (en) 2018-06-20

Family

ID=52130695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15808789.0A Active EP3158138B1 (en) 2014-11-04 2015-11-04 A joint between beam elements and column elements made of prefabricated reinforced concrete

Country Status (7)

Country Link
EP (1) EP3158138B1 (en)
EA (1) EA032453B1 (en)
ES (1) ES2677725T3 (en)
HU (1) HUE039918T2 (en)
PL (1) PL3158138T3 (en)
PT (1) PT3158138T (en)
WO (1) WO2016071847A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106592759A (en) * 2016-12-02 2017-04-26 上海理工大学 Assembly type reinforced concrete frame beam column joint and preparation method
CN108532751B (en) * 2018-05-29 2023-09-22 福州大学 Assembled concrete beam column joint and construction method
CN114045928B (en) * 2021-11-10 2023-02-03 河北工业大学 Assembled beam column and column foundation splicing structure and construction method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR708167A (en) * 1930-12-20 1931-07-21 Method and device for assembling reinforced concrete elements
FR941058A (en) * 1947-01-17 1948-12-31 Method and devices for the assembly and erection of building elements
AU5049493A (en) * 1991-05-09 1994-01-27 Integrated Beam Technology Pty. Ltd. Building construction using prefabricated concrete components
US20060059841A1 (en) * 2004-08-18 2006-03-23 Dayton Superior Corporation Of 7777 Washington Village Drive Reinforced concrete structure, rebar end anchor therefor and method of manufacturing
JP2009197560A (en) * 2008-02-25 2009-09-03 Taisei Corp Connection structure
JP5656657B2 (en) * 2011-01-14 2015-01-21 三菱重工業株式会社 Precast concrete joint structure

Also Published As

Publication number Publication date
HUE039918T2 (en) 2019-02-28
EA201792208A1 (en) 2018-04-30
ES2677725T3 (en) 2018-08-06
EP3158138B1 (en) 2018-06-20
PT3158138T (en) 2018-07-16
EA032453B1 (en) 2019-05-31
WO2016071847A1 (en) 2016-05-12
PL3158138T3 (en) 2018-11-30

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