EP0383791A1 - Support de coffrage - Google Patents

Support de coffrage

Info

Publication number
EP0383791A1
EP0383791A1 EP19880908930 EP88908930A EP0383791A1 EP 0383791 A1 EP0383791 A1 EP 0383791A1 EP 19880908930 EP19880908930 EP 19880908930 EP 88908930 A EP88908930 A EP 88908930A EP 0383791 A1 EP0383791 A1 EP 0383791A1
Authority
EP
European Patent Office
Prior art keywords
shoring
support according
webs
flanges
shoring support
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Withdrawn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
EP19880908930
Other languages
German (de)
English (en)
Inventor
Heinrich BRÜGGEMANN
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.)
Bilfinger SE
Original Assignee
Bilfinger und Berger Bau AG
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 Bilfinger und Berger Bau AG filed Critical Bilfinger und Berger Bau AG
Publication of EP0383791A1 publication Critical patent/EP0383791A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/02—Foundation pits
    • E02D17/04—Bordering surfacing or stiffening the sides of foundation pits

Definitions

  • the invention relates to a shoring for a construction pit shoring.
  • Excavation pits for the production of the basement of high-rise buildings, for the production of underground garages and underground tunnels in inner-city areas usually require vertical support, since there is usually limited space, so that the excavation pit limitations cannot be carried out with natural, stable embankments.
  • a very frequently used type of construction of trench shoring is carried out with shoring beams made of S. steel profiles of various types and infills made of wood, concrete or steel arranged between these beams.
  • the shoring beams are either driven in or placed in large holes. In the course of excavation excavation, the gaps between the shoring beams are fanned out.
  • Shoring supports are known, which are composed of two commercially available U-profiles, the webs of the U-profiles being arranged parallel to one another at a distance, the total of 4 flanges directed outwards and the respective flanges lying in one plane being connected by welded-on connecting plates .
  • the binding plates are arranged on both sides of the shoring at a distance of approx. 1.50 m over the entire shoring length.
  • the well-known shoring device is placed in a borehole, which is then backfilled.
  • a disadvantage of the known shoring device is the complex manual welding work, its low bending rigidity in the direction of the flanges and its low torsional rigidity.
  • the low bending stiffness in the direction of the flanges and the low torsional stiffness often have an adverse effect even during transport and installation. Often the shoring must be set in a cased borehole, the casing of which can only be pulled after the cavities have been filled.
  • a shoring member which has a hat-shaped profile.
  • This shoring is in one piece and manufactured in the rolling process.
  • Its cross-sectional shape is structurally very unfavorable.
  • the small proportion of the area of the profile rear wall and the connecting flanges in the total cross section results in only small moments of resistance.
  • the unfavorable ratio of bending stiffness to meter weight is therefore uneconomical.
  • the most frequently used shoring beams are in the cross cutting height range from 300 to 400 mm.
  • a one-piece rolled beam of this cross-sectional height with a right angle between the webs and flanges cannot be manufactured using rolling technology.
  • the invention is based on the object of specifying a shoring for a construction pit shoring, which has an optimal ratio of bending stiffness to weight per meter, which is industrially producible and which makes the installation and removal more economical.
  • the most important requirements for an optimal cross-sectional shape of a shoring beam are the maximum bending stiffness and torsional stiffness with the lowest material consumption and the smallest external dimensions. This is achieved through high, thin webs and narrow, thick flanges. For the main application area of shoring, web heights of approx. 300 to 400 mm are required. The appropriate flange width is approx. 100 to 120 mm, due to the required. Support depth of the infills. The optimal cross-sectional shape will have flange thicknesses that are more than twice the web thickness.
  • a preferred embodiment of the shoring device according to the invention is made from 2 z-shaped rolled profiles, the dimensions of which can be optimized in a simple manner by appropriate adjustment of the rollers.
  • the welded joint (4) is preferably machined using the submerged arc welding process manufactured in the rolling mill.
  • the most cost-effective type of welded connection (4) can be selected, as specified in the subclaims.
  • a key advantage of the shoring device according to the invention is its closed shape.
  • Its narrow shape due to only 2 protruding flanges on one side, enables the production of smaller drill holes if the shoring is used as a drilling support. The result is lower drilling costs and backfilling costs. Smaller boreholes also result in less loosening of the soil in the drilling area, which is important when digging trenches in the vicinity of existing buildings because of possible building settlements.
  • the application of the submerged arc welding process enables an economical industrial production of the shoring device according to the invention. This enables welding speeds of over 2 meters per minute. Further advantages are: large melting depths up to approx. 18 mm, low wire consumption, flow production, high-quality welds, low energy consumption, automatic process, no special protective measures required.
  • Another preferred embodiment of the shoring provides a parallel arrangement of the webs (5) and a right-angled connection of the flanges (3) to the webs (5).
  • the parallel arrangement of the webs (5) enables the construction to be simple Order of ground anchors within the shoring, the anchor head being supported, for example, on 2 steel plates (11) which are welded to the two webs. Attaching the anchor heads directly to the rear flanges is undesirable since the ground anchors are usually burned off when the shoring is removed and the rear flanges would be damaged.
  • the shoring device according to the invention can either be rammed in or introduced into boreholes.
  • Fig. 1 shows a cross section of the shoring
  • Fi g. 3 is a flange formation of the shoring
  • Fi g. 4 shows a welded joint arrangement
  • Fig. 5 shows a shoring with a ground anchor
  • FIG. 9 shows the required borehole diameter.
  • FIG. 10 borehole filling area
  • the cross-section of a shoring member shown in FIG. 1 is composed of 2 z-shaped rolled sections (1).
  • the webs (5) are arranged in parallel, the flanges (3) are arranged at right angles to the webs (5).
  • the welded joint (4) is Executed on one side as a V-seam, the z-shaped rolled sections (1) providing a bevel (6) for this purpose.
  • the z-shaped rolled profile (1) is shaped symmetrically, which is why a profile shape is sufficient to produce a shoring.
  • Fig. 2 shows a double-sided weld (4) in the form of 2 V seams.
  • the z-shaped profile is produced with 2 folds (6) on the flanges (3) according to FIG. 3.
  • Fig. 4 shows a shoring view of the welded connection side with a welded connection in partial sections (7).
  • FIGS. 5 and 6 show a shoring device with an earth anchor head (8) placed on the flanges (3).
  • the anchor bracket (9) is a solid sheet which is welded to the flanges (3) and for assembly purposes and to accommodate the vertical component of the Anchor force serves. If necessary, binding plates (10) can be welded to the flanges (3) on the construction pit side in order to increase the rigidity of the shoring in the direction of the shoring plane.
  • FIG. 7 and 8 show the arrangement of a countersunk anchor head within the shoring.
  • This embodiment is implemented when the building wall is concreted directly onto the shoring without a work space ("Berlin shoring").
  • Two steel plates (11), which are welded to the webs (5) on both sides, serve as supports for the anchor head, which consists of a support plate (12), a wedge plate (13), the anchor ring (14) and the wedges (15) .
  • the shoring member can be stiffened in the direction of the shoring plane on its open side, for example by sections (16) of a U-profile which is welded to the webs (5) on both sides.
  • Fig. 9 shows the reduction in the outer diameter of the inventions according to the shoring device compared to an equivalent shoring device, which is composed of 2 U-profiles. On average, the borehole can be made 20% smaller in diameter.
  • Fig. 10 shows the necessary area (18), which must be refilled in a borehole when placing the shoring.
  • the area (19) can remain free, so that savings in filling material of approximately 30 to 50% are possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

Un support de coffrage pour fondations présente un profil en forme de chapeau et se compose de deux profilés (1) coudés en angle, en forme de Z, et dont les bords qui sont en contact l'un avec l'autre sont reliés par une soudure (4).
EP19880908930 1987-09-26 1988-09-26 Support de coffrage Withdrawn EP0383791A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8713006U DE8713006U1 (de) 1987-09-26 1987-09-26 Verbauträger
DE8713006U 1987-09-26

Publications (1)

Publication Number Publication Date
EP0383791A1 true EP0383791A1 (fr) 1990-08-29

Family

ID=6812497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880908930 Withdrawn EP0383791A1 (fr) 1987-09-26 1988-09-26 Support de coffrage

Country Status (3)

Country Link
EP (1) EP0383791A1 (fr)
DE (1) DE8713006U1 (fr)
WO (1) WO1989002954A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047875A1 (de) * 2007-11-28 2009-06-04 Hilti Aktiengesellschaft Profil
CN111395351B (zh) * 2020-02-25 2022-07-22 中铁第四勘察设计院集团有限公司 基坑装配式支撑结构以及支撑施工方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE579543C (de) * 1933-06-28 Kurt Schroeder Dipl Ing Verankerung fuer eiserne Spundwaende
DE709971C (de) * 1933-03-15 1941-09-01 Bochumer Eisen Heintzmann Rinnenprofil in Belageisenform
DE1810818U (de) * 1960-03-02 1960-05-05 Emil Mauritz Dipl I Huennebeck U- bzw. c-profil.
DE1873308U (de) * 1963-03-11 1963-06-06 A K Gebauer & Cie Profiltraeger.
DE1509031A1 (de) * 1963-05-06 1969-02-20 Eguia Gabriel Ramos Profil aus Stahl,Aluminium od.dgl.
DE2039386B1 (de) * 1970-08-07 1971-11-11 Hochtief Ag Baugrubenumschliessung
DE2651590A1 (de) * 1976-11-12 1978-05-24 Peter Dipl Ing Braun Bohltraeger und bausatz fuer bohltraegerwaende
LU77230A1 (fr) * 1977-04-29 1978-06-01

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8902954A1 *

Also Published As

Publication number Publication date
WO1989002954A1 (fr) 1989-04-06
DE8713006U1 (de) 1987-11-19

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