EP2484833A1 - A reinforced concrete slab for bridge floors with two bearing beams and relevant floor fabrication method. - Google Patents

A reinforced concrete slab for bridge floors with two bearing beams and relevant floor fabrication method. Download PDF

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Publication number
EP2484833A1
EP2484833A1 EP12152918A EP12152918A EP2484833A1 EP 2484833 A1 EP2484833 A1 EP 2484833A1 EP 12152918 A EP12152918 A EP 12152918A EP 12152918 A EP12152918 A EP 12152918A EP 2484833 A1 EP2484833 A1 EP 2484833A1
Authority
EP
European Patent Office
Prior art keywords
sections
thickness
predalle
slab
reinforced concrete
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Withdrawn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
EP12152918A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefano Niccolini
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.)
Dsd-Dezi Steel Design Srl
Original Assignee
Dsd-Dezi Steel Design 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 Dsd-Dezi Steel Design Srl filed Critical Dsd-Dezi Steel Design Srl
Publication of EP2484833A1 publication Critical patent/EP2484833A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E01D19/125—Grating or flooring for bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/268—Composite concrete-metal

Definitions

  • the present patent application for industrial invention relates to a reinforced concrete slab, normally known as "predalle", used to make bridge floors with two bearing beams.
  • Fig. 1 shows the fabrication of a bridge according to the prior art.
  • the bridge comprises a plurality of vertical pillars (200) arranged along two rows extending for the entire development of the bridge.
  • a longitudinal bearing beam (2) with overturned-H section is disposed on the pillars (200) of each row, in such manner that each beam extends in the longitudinal direction (Y) of the bridge. So, the two beams (2) are parallel and extend longitudinally for the length of the bridge.
  • a reinforced concrete slab (1) is made on the two beams (2), defining the width of the bridge and extending for the entire length of the bridge. As shown in the figure, the slab is made of two lateral sections that project outwards with respect to the bearing beams (2).
  • a formwork (3) for concrete cast is held from above and handled by means of a special metal framework (4) laid on the beams (2) of the bridge, with the possibility to be translated forward in the direction of the length of the bridge.
  • Fig. 3 is a cross-sectional view of a finished slab (1) disposed on the two longitudinal bearing beams (2).
  • said technology is impaired by the fact that it requires the use of an apparatus (consisting in said formwork (3) supported by said mobile framework (4)) that is very burdensome in terms of cost, transportation and assembly in the building site.
  • the first aforementioned technique is not suitable to fabricate the slab of bridge with modest length.
  • a further disadvantage of said first technique is that the formwork must be removed within 24-36 hours from cast, in order for the work to be completed in a reasonable time. This results in high complexity in concrete management, both for the difficulties encountered in preparing a suitable concrete mix and also for the inspections that must be carried out in the building site in order to guarantee the necessary minimum resistance at any time of the year upon removal.
  • construction time cannot be reduced as desired.
  • construction time is affected by the fact that the fabrication of the slab (1) can only start after completely laying the main beams (2) whereon said mobile framework (4) is laid.
  • Predalles (11) are made of reinforced concrete with constant thickness (normally 4-6 cm) and are self-bearing by means of electrowelded lattice girders (11a).
  • Fig. 5 shows the disposition of a predalle (11) on the beams (2) of the bridge.
  • the predalle (11) is shaped as a rectangular, long narrow slab and is disposed on the beams (2), in such manner that the longitudinal direction of the predalle (11) extends along axis (X), that is transversally and orthogonally to the length of the bridge. Instead, the transversal direction of the predalle extends along axis (Y), that is along the longitudinal direction of the bridge.
  • the length of the predalle (11) is equal to the width of the bridge and referred to as (L), whereas the width of the predalle (11) is referred to as (H).
  • the length (L) of the predalle is approximately 5-7 times its width (H).
  • the predalle (11) is made of two lateral sections projecting outwards with respect to the bearing beams (2) of the bridge.
  • the total thickness of the slab (10) is equal to the sum of the thickness of the prefabricated predalles (11) and the final concrete cast (12).
  • the advantage of the second construction technique is that it reduces the total construction time of the work, since predalles can be made during the construction of substructures (pillars (200) and beams (2)) and the mounting of the main bearing beams (2).
  • the construction time of the slab (10) can be considerably reduced using a suitable number of equipment and workers to lay the prefabricated predalles (11), mount the reinforcements (13) and make the final concrete cast (12).
  • the thickness of the slab (10) is determined by the thickness of the section with maximum stress and is maintained unchanged for the entire length.
  • GB 1 303 858 discloses a predalle with variable thickness cross-section; nevertheless, the longitudinal section of said predalle has constant thickness.
  • JP 2001 011821 relates to bridges with more than two beams and discloses a predalle with constant thickness with projections formed by thickening the ends of the predalle to provide planking with transversal inclination, laying the predalle on the bearing beams that are disposed horizontally. Moreover, the predalle does not permit to make the entire width of the slab (projections included) with a single element.
  • the purpose of the present invention is to devise a predalle for construction of reinforced concrete slabs for bridges with two bearing beams that is not impaired by the drawbacks of the prior art and is practical, inexpensive, reliable and simple to make and install.
  • the predalle of the invention provides for variable thickness along the longitudinal direction (referred to as (X) in Fig. 5 ), according to the designer's technical, static and architectural requirements.
  • the method of the invention is similar to the aforementioned second construction technique B), introducing the new idea of giving a variable thickness to the predalles in such manner that - in spite of the traditional final cast with constant thickness - the cross-section of the slab has a variable thickness.
  • the method of the invention can offer the advantages of the two constructions systems, without being impaired by the corresponding drawbacks, and more precisely:
  • the method according to the invention provides for the following sequence of operating steps:
  • a predalle (110) according to the invention is disclosed.
  • the predalle (110) comprises a monolithic reinforced concrete slab (110b) stiffened with electrowelded lattice girders (110a).
  • the reinforced concrete slab (110b) has a longitudinal section (i.e. along axis X of Fig. 10 ) with variable thickness.
  • said slab (110b) has higher thickness in sections (P) subjected to higher stress.
  • the predalle (110) is made of two lateral sections projecting outwards with respect to the bearing beams (2) of the bridge.
  • the sections (P) subjected to higher stress are two in number and are situated in intermediate positions of the predalle, in correspondence of the contact surface with the beams (2).
  • the concrete slab (110b) comprises two intermediate sections (P) with higher thickness, a central section (C) with lower thickness between the two intermediate sections (P) with higher thickness and two end sections (E) with lower thickness at the ends of the predalle.
  • the end sections (E) are connected to the intermediate sections (P) by means of tapered sections (R) with increasing thickness.
  • the intermediate sections (P) are connected to the central section (C) by means of tapered sections (V) with decreasing thickness.
  • the intermediate sections with higher thickness (P) have thickness approximately equal to three times the thickness of the central sections (C) with lower thickness and end sections (E).
  • the intermediate sections (P) with higher thickness have length (L1) approximately equal to the width of the upper surface of each longitudinal bearing beam (2) of the bridge. It must be considered that the length (L1) of the two sections with higher thickness (P) is approximately equal to 1 /10 of the length of the predalle, therefore with considerable saving on material.
  • Through holes (F) are provided in the intermediate sections with higher thickness (P).
  • the fabrication of a slab (100) comprises the following sequence of operating steps:
  • the reinforcement (130) is tied to the lattice girders (110a) of the predalles (110) and final concrete cast (120) is made to drawn both reinforcement (130) and electrowelded lattice girders (110a).
  • concrete cast (120) penetrates the holes (F) of the predalle (110) and adheres on the upper surface of the beam (2) in such manner to firmly anchor the slab (110) to the beams (2).
  • the lower surface of the predalles - and consequently the slab - can be given any shape according to the specific technical, static or architectural requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Metal Rolling (AREA)
EP12152918A 2011-02-02 2012-01-27 A reinforced concrete slab for bridge floors with two bearing beams and relevant floor fabrication method. Withdrawn EP2484833A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITAN2011A000010A IT1404293B1 (it) 2011-02-02 2011-02-02 Metodo per la realizzazione di solette da ponte a spessore variabile in cemento armato.

Publications (1)

Publication Number Publication Date
EP2484833A1 true EP2484833A1 (en) 2012-08-08

Family

ID=43975861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12152918A Withdrawn EP2484833A1 (en) 2011-02-02 2012-01-27 A reinforced concrete slab for bridge floors with two bearing beams and relevant floor fabrication method.

Country Status (2)

Country Link
EP (1) EP2484833A1 (it)
IT (1) IT1404293B1 (it)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1302858A (it) * 1969-02-19 1973-01-10
GB1303858A (it) 1969-06-25 1973-01-24
FR2622907A1 (fr) * 1987-11-06 1989-05-12 Pico Sogetrap Gestion Etu Trav Ouvrages de genie-civil,notamment ponts et procedes de construction de ceux-ci
WO1999037865A1 (de) * 1998-01-23 1999-07-29 Herbert Geisler Verfahren zur erstellung einer ein- oder mehrfeldrigen brücke
JP2001011821A (ja) 1999-06-30 2001-01-16 Kondo Kozai Kk 橋床など土木用のコンクリート捨て型枠付き立体トラス
WO2006049377A1 (en) * 2004-11-08 2006-05-11 Hyosung Lb-Deck Co., Ltd Bridge slab construction method and lattice bar deck-shaped precast concrete plate applied thereto
WO2010004210A1 (fr) * 2008-07-08 2010-01-14 Razel Procede et systeme de coffrage pour realiser un pont

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1302858A (it) * 1969-02-19 1973-01-10
GB1303858A (it) 1969-06-25 1973-01-24
FR2622907A1 (fr) * 1987-11-06 1989-05-12 Pico Sogetrap Gestion Etu Trav Ouvrages de genie-civil,notamment ponts et procedes de construction de ceux-ci
WO1999037865A1 (de) * 1998-01-23 1999-07-29 Herbert Geisler Verfahren zur erstellung einer ein- oder mehrfeldrigen brücke
JP2001011821A (ja) 1999-06-30 2001-01-16 Kondo Kozai Kk 橋床など土木用のコンクリート捨て型枠付き立体トラス
WO2006049377A1 (en) * 2004-11-08 2006-05-11 Hyosung Lb-Deck Co., Ltd Bridge slab construction method and lattice bar deck-shaped precast concrete plate applied thereto
WO2010004210A1 (fr) * 2008-07-08 2010-01-14 Razel Procede et systeme de coffrage pour realiser un pont

Also Published As

Publication number Publication date
ITAN20110010A1 (it) 2012-08-03
IT1404293B1 (it) 2013-11-22

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