EP0874097A2 - Etrier et méthode de levage - Google Patents

Etrier et méthode de levage Download PDF

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Publication number
EP0874097A2
EP0874097A2 EP98302995A EP98302995A EP0874097A2 EP 0874097 A2 EP0874097 A2 EP 0874097A2 EP 98302995 A EP98302995 A EP 98302995A EP 98302995 A EP98302995 A EP 98302995A EP 0874097 A2 EP0874097 A2 EP 0874097A2
Authority
EP
European Patent Office
Prior art keywords
lifting
lifting chair
link
members
chair link
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Withdrawn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
EP98302995A
Other languages
German (de)
English (en)
Other versions
EP0874097A3 (fr
Inventor
Kamal Neckoula
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.)
Individual
Original Assignee
Individual
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
Priority claimed from GBGB9708157.4A external-priority patent/GB9708157D0/en
Priority claimed from GBGB9712800.3A external-priority patent/GB9712800D0/en
Application filed by Individual filed Critical Individual
Publication of EP0874097A2 publication Critical patent/EP0874097A2/fr
Publication of EP0874097A3 publication Critical patent/EP0874097A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups

Definitions

  • the present invention relates to a lifting chair link for lifting and manoeuvring steel reinforcing cages for reinforced concrete structures, and to a method of lifting a reinforcing cage.
  • the steel structures or "cages” used for reinforcing concrete are generally lifted and manoeuvred into position by attaching the lifting cables of a crane to steel components known as cathedral bars that are welded to the steel cages.
  • Other strengthening components known as Z bars may also be welded to the cages.
  • a disadvantage of this method is that the structure of the cage can be weakened at the locations of the welds. Also, because little support is provided for the cage, the structure may be deformed as it is lifted.
  • a lifting chair link that may be clamped without welding to the steel reinforcing structure. Because the lifting chair link is not welded to the reinforcing cage, the structure of the cage is not weakened. The need for on-site welding is also avoided. This is desirable since welds made on site can be unreliable, owing to poor weather conditions or the presence of dust.
  • a lifting chair link having substantially the form of a figure eight.
  • the link may comprise two or more parts that are connected together for use, for example by welding or clamping, to create the figure-of-eight form.
  • the lifting chair link strengthens the structure of the reinforcing cage and spreads the load during lifting, thereby reducing the risk of the cage being deformed.
  • a lifting chair having substantially the form of a letter S.
  • a method of lifting a reinforcing cage for reinforced concrete structures in which lifting chair links as described above are attached by bolting to the cage and the cage is lifted into position by lifting means attached to the lifting chair links.
  • a conventional concrete diaphragm wall which may be intended for example as a foundation for a bridge or a building, normally includes a steel reinforcing structure or cage 2 that is positioned in an excavated trench 4, which is then filled with concrete.
  • the reinforcing cage 2 is typically box shaped and includes a set of vertical bars 6 and a set of horizontal bars 8 adjacent each face of the wall.
  • the vertical and horizontal bars 6,8 are welded to one another wherever they meet to form a grid.
  • the two sets of vertical and horizontal bars 6,8 are bent around the edges of the structure to meet one another.
  • the lifting chair link 10 which is shown most clearly in Figs. 3 and 4, is fabricated from steel bars and has the form substantially of a figure-of-eight. More specifically, the lifting chair link 10 comprises horizontal upper and lower bars 12a,12b, two upper vertical members 14a,14b that depend from the upper bar 12a, two lower vertical members 16a,16b that extend upwards from the lower bar 12b, and two diagonal members 18a,18b that connect each upper vertical member 14a,14b to the opposite lower vertical member 16a,16b.
  • the lifting chair link 10 may be formed from a single piece of steel that is bent to the shape shown in the drawings or, alternatively, it may be constructed from two or more separate components that are connected together on site.
  • it may consist of two components, each consisting, as shown in Fig. 5, of two vertical members 14a,14b, a horizontal bar 12a, a first full length diagonal member 20a and a second half-length diagonal member 20b.
  • Two such components may be connected together by joining the longer diagonal member 20a of one of the components to the shorter diagonal member 20b of the other component, for example by welding or clamping.
  • the link may consist of two substantially S-shaped components that are connected together for use to produce the figure-of-eight form.
  • twelve lifting chair links 10 may typically be used to lift a reinforcing cage for a diaphragm wall, these being arranged in three rows of four links (those being an upper row 22a, a middle row 22b and a lower row 22c).
  • Each link 10 extends across the cage 2 perpendicular to the plane of the diaphragm wall and its vertical members 14,16 are attached to the vertical bars 6 on opposite sides of the cage 2 by means of eight U-shaped bolts 24.
  • the U-bolts 24 are shown arranged substantially horizontally around the vertical members 14,16 of the lifting chair link 10 and the vertical bars 6 of the cage 2. In practice, it may be preferable to set the U-bolts 24 at an angle so that they capture the horizontal cage bars 8 as well the vertical cage bars 6.
  • each lifting chair link 10 is attached to a structure known as a cathedral bar 26, which consists of an upright triangular frame 28 consisting of two slanting bars 30 and a cross bar 32, and two vertical legs 34 that depend from the lower corners of the triangular frame 28.
  • the cathedral bar 26, which is constructed from mild steel, is attached to the lifting chair link 10 and the reinforcing cage 2 by means of the U bolts 24, which clamp the vertical legs 34 to the upper vertical members 14a,b of the links 2 and the vertical bars 6 of the cage 2.
  • the four lifting chair links 10 in the middle row 22b are connected to a lifting bar 36 that extends horizontally through the links 10 and is attached by welding to the upper vertical member 14a and one of the diagonal bars 18a on one side of each chair, as shown in detail in Fig. 6.
  • a second lifting bar 36 is attached in a similar manner to the four lifting chair links 10 in the bottom row 22c.
  • the reinforcing cage 2 is erected using lifting gear as follows: four lifting cables (not shown) are attached to the slanting elements 30 of the cathedral bars 26, which are attached to the lifting chairs 10 in the top row 22a. Further lifting cables are attached via snatch blocks to the lifting bars 36 that are connected to the lifting chair links 10 in the middle and bottom rows 22b,c.
  • the reinforcing cage 2 is lifted into the vertical position and then lowered into an excavated trench 4.
  • the figure-of-eight shaped lifting chair links 10 strengthen the cage 2 and thereby reduce the risk of deformation. They also spread the stress evenly over the whole of the structure, thereby reducing strain and the risk of structural failure.
  • the cage 2 is hung from the walls of the trench by means of U-shaped hanging bars (not shown). One leg of each hanging bar is welded to the cathedral bars 26 and the other leg is clamped using a U-bolt to one of the vertical bars of the cage. Once the reinforcing cage 2 has been located in the trench 4, at least some of the U-bolts 24 may be removed prior to filling the trench with concrete, so that they can be reused.
  • the invention may readily be adapted for lifting many other types of reinforcing structure, including for example pile cages.
  • Fig. 7 shows a third type of lifting chair link, which has an S-shaped configuration.
  • a cathedral bar is formed integrally with the S-shaped lifting chair link, by creating an apex bend in the uppermost part of the link.
  • Fig. 8 shows a fourth type of lifting chair link which, like the link shown in Fig. 7, is S-shaped. A cathedral bar is not, however, formed integrally with the link.
  • Fig. 9 shows a detail of a fifth type of lifting chair link, which has a figure 8 shape and includes an integral cathedral bar.
  • Fig. 10 shows a sixth type of lifting chair link, which has substantially a Figure 7 shape and includes two additional horizontal bars.
  • Fig. 11 shows a seventh type of lifting chair link which has substantially a Figure 8 shape and includes two additional horizontal bars.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Working Measures On Existing Buildindgs (AREA)
EP98302995A 1997-04-22 1998-04-20 Etrier et méthode de levage Withdrawn EP0874097A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9708157.4A GB9708157D0 (en) 1997-04-22 1997-04-22 Lifting chair link and method of lifting
GB9708157 1997-04-22
GBGB9712800.3A GB9712800D0 (en) 1997-06-19 1997-06-19 Lifting chair and method of lifting
GB9712800 1997-06-19

Publications (2)

Publication Number Publication Date
EP0874097A2 true EP0874097A2 (fr) 1998-10-28
EP0874097A3 EP0874097A3 (fr) 1999-12-01

Family

ID=26311427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98302995A Withdrawn EP0874097A3 (fr) 1997-04-22 1998-04-20 Etrier et méthode de levage

Country Status (2)

Country Link
EP (1) EP0874097A3 (fr)
GB (1) GB2324517B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030079436A1 (en) * 2001-10-30 2003-05-01 Manfre Mark Thomas Lifting frame
CN106760223A (zh) * 2015-11-20 2017-05-31 上海十三冶建设有限公司 钢筋连接工具及其使用方法
CN117738167B (zh) * 2024-02-18 2024-05-10 中铁建工集团有限公司 一种深基坑支护结构施工装置及其施工工艺

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB506723A (en) * 1937-08-26 1939-05-26 Gilt Edge Safety Glass Ltd Improvements in or relating to the tempering of glass sheets
BE542127A (fr) * 1954-10-19
GB1113438A (en) * 1964-07-03 1968-05-15 Mono Concrete Ltd Reinforced concrete pipe
US3797877A (en) * 1972-07-11 1974-03-19 Braun Co C Lifting saddle for vessels
FR2568916B1 (fr) * 1984-08-10 1986-09-05 Selam Sa Perfectionnement aux armatures metalliques pour elements de constructions prefabriquees
FR2692615A1 (fr) * 1992-06-17 1993-12-24 Jacques Lallemand Armature et panneaux préfabriqués pour constructions pararismiques constructions ainsi obtenues.

Also Published As

Publication number Publication date
GB2324517A (en) 1998-10-28
EP0874097A3 (fr) 1999-12-01
GB9713374D0 (en) 1997-08-27
GB2324517B (en) 2000-10-25

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