WO2004085767A1 - Arrangement and method for forming a bushing in concrete - Google Patents

Arrangement and method for forming a bushing in concrete Download PDF

Info

Publication number
WO2004085767A1
WO2004085767A1 PCT/NO2004/000090 NO2004000090W WO2004085767A1 WO 2004085767 A1 WO2004085767 A1 WO 2004085767A1 NO 2004000090 W NO2004000090 W NO 2004000090W WO 2004085767 A1 WO2004085767 A1 WO 2004085767A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
concrete
arrangement according
chara
cover
Prior art date
Application number
PCT/NO2004/000090
Other languages
English (en)
French (fr)
Inventor
Oddvar Brune
Original Assignee
Oddvar Brune
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 Oddvar Brune filed Critical Oddvar Brune
Publication of WO2004085767A1 publication Critical patent/WO2004085767A1/en

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Classifications

    • 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
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
    • E04G15/063—Re-usable forms
    • 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
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
    • E04G15/061—Non-reusable forms

Definitions

  • the present invention relates to a device for forming a lead-through in constructions of concrete when pouring the same.
  • the invention discloses an arrangement which forms grooves in the concrete in an area on the inside of the duct for fastening sealing plugs or covers.
  • Lead-throughs in concrete walls and decks are found in all kinds of constructions. Examples of such lead-throughs are openings for stays when shuttering walls or decks for technical installations in the final construction. Currently the existence of complete solutions to provide such lead-throughs is lacking, both in quality, execution and design.
  • One method discloses a bushing with hollow frustoconical end pieces through which the stays are introduced to support the formwork of e.g. a wall. After curing of the concrete the end pieces are removed and the ducts are filled with concrete. It has been proven difficult to seal the duct with concrete due to lack of adherence between the cured concrete and the mortar used. Further it is difficult to remove the frustoconical end pieces without damaging the surrounding concrete. Removing the end pieces is also time- consuming and not cost effective.
  • a further disadvantage with known solutions is that the spacer-tube and the end-pieces are subjected to excessive strain during shuttering and expand when the formwork is removed. Hence stress arises in the construction and cracks may be formed and propagate, which makes it difficult to obtain a sealed construction.
  • the main object of the present invention is to solve the problems of the prior art. Improved quality and an easier application will be less time consuming and incur lower costs .
  • Yet another object of the present invention is that the grooves in the cured concrete are formed by a bushing which can easily be removed without damaging the surrounding concrete.
  • Another object of the present invention is that the plugs or covers act as formwork when injecting or introducing expanding concrete during sealing in order to avoid the problems associated with shuttering and post sealing of the ducts and openings.
  • a further object of the invention is to provide an arrangement which can accept a certain amount of compression during shuttering without damaging the concrete due to expansion. It is also an object of the present invention to provide a solution for forming an opening in concrete which can be applied when forming openings for stays when shuttering as well as for forming openings and ducts for leadthrough of piping electrical wiring etc. and for sealing off post- tensioning cables in constructions of concrete.
  • Figure la is a perspective view of an embodiment of an arrangement according to the present invention.
  • Figure lb is a side view of the arrangement in figure 1 a
  • Figure 2 is a perspective view of an embodiment of a conical end piece according to the invention.
  • Figure 3 is a perspective view of a second embodiment of an end piece, in the form of an installation ring,
  • Figure 4 is a perspective view of a third embodiment of an end piece
  • Figure 5 shows an embodiment of a bushing according to the invention
  • Figure 6a and 6b shows an embodiment of a plug according to the invention
  • Figure 7 and 8 shows examples of embodiments of the plug in figure 6a and 6b
  • Figure 9a-9c shows three different embodiments of a cover according to the invention.
  • the invention comprises a spacer tube 3, a conical end piece 1, bushing 2 and a plug 6.
  • the spacer-tube 3 may be produced of plastic material or fibre reinforced concrete.
  • the end piece 1 matches the bushing 2 and is slightly conical.
  • the bushing 2 is made of a flexible material with a compressive strength as low as possible but sufficient to withstand the pressure of the concrete during pouring.
  • the bushing is further provided with denticulations comprising a plurality of teeth forming a thread like configuration in the cured concrete. Each tooth does not run completely around the periphery of the bushing 2 which is the case for most conventional threads. This will ease the removal of the bushing 2 : and facilitate the positioning of the plug 6.
  • the bushing 2 is preferably cylindrical and is removed by distorting and/or twisting the bushing, which is made possible due to the flexibility of the bushing 2.
  • the bushing can be made disposable or reuseable.
  • the bushing can be made of any suitable material, preferably a flexible plastic material.
  • Figur 1 shows an embodiment for providing lead-throughs for stays when shuttering walls or decks.
  • the present invention will provide a durable seal of the construction as well as simple installation and use.
  • the bushing 2 is placed on the conical end-piece 1 and is installed with the spacer-tube 3 which preferably is made of fibre reinforced concrete.
  • the stay is brought through the formwork and is fastened in a conventional way to support the formwork during pouring of the construction. After curing of the concrete and removal of the formwork, the conical end piece 1 and the bushing 2 can be removed.
  • the bushing 2 is made of a flexible material and can be removed using an appropriate tool or manually by hand. The flexibility of the bushing 2 makes it possible to remove the bushing 2 without damaging the surrounding concrete.
  • a denticulation is formed which facilitates fastening of a plug 6.
  • the denticulation does not run completely around the periphery of the bushing and facilitates the positioning of the plugs 6 or covers 7, 8, 9 at different orientations. This feature will be described below with respect to use of the invention for making lead-throughs for ducts and pipes.
  • the plug 6 can be made of fibre reinforced concrete and is produced with sufficient clearance according to the denticulations which will be formed in the concrete. Expanding mortar is applied to the plug 6 and the plug is pushed and twisted into position. If desired the plug 6 can be provided with openings to facilitate injection of an adequate material in the cavity in the construction. On the inner end, the plug 6 may be provided with a compressible portion (not shown), e.g. foam plastic, or a groove in the plug 6 covered by a flexible membrane to absorb expansion of the mortar injected into the cavity.
  • a compressible portion not shown
  • foam plastic e.g. foam plastic
  • the system comprises a spacer-tube, and an installation ring 4 shown in figure 3, a bushing and a cover 7, 8, 9 shown in figures 9a-9c.
  • the bushing is formed similar to the embodiment described above, but the dimensions are adjusted to the size of the duct or opening which is going to be formed.
  • the spacer-tube is made of a plastic material, wood fibre material (cardboard) or a fibre reinforced concrete. All of the appropriate materials have a coarse surface in order to provide sufficient adherence to the surrounding material.
  • the installation ring 4 is made of a plastic material and will form the base for fastening the cover and the spacer tube.
  • the cover 7 can be made of various materials depending on the application e.g. plastic material, thin steel sheet material, or fibre reinforced concrete.
  • the cover 7 is provided with openings for various tubing, ducts, wiring etc.
  • the opening in the cover can be of any geometry. It is therefore possible to lead rectangular duct through the circular covers as shown in figure 9.
  • the number of openings and the dimensions of a cover can also vary, for example one opening of 0200 mm and two openings of 0100.
  • An elastic membrane or gasket may be provided around the edge of the openings in the covers to seal the gap between the piping, duct, wire etc. and the cover.
  • the object passing through the concrete construction is angled, hence it does not pass the construction at a 90° angle.
  • the present invention solves this situation by rotating the covers.
  • the opening in the cover 7 is positioned off centre of the cover as shown in figure 9, hence the two corresponding covers on opposite sides of the construction can be rotated relative to each other to obtain the desired angle.
  • the configuration of the denticulations makes this possible.
  • the denticulations do not extend around the periphery of the cover and the mutual distance between the denticulations determine the rotation of the cover for each step of rotation.
  • the cover 7 is fastened by applying expanding mortar and subsequent positioning of the cover by pushing and twisting. After positioning the cover, the cavity between the- spacing tube and the object which is lead through the opening can be filled by injection.
  • the substance used should meet the requirements in each specific case. For lead-throughs in structures with fire classification, the substance must of course be fire-retardent .
  • the cover 7 is therefore provided with two openings, one for injection and one for ventilation, placed at the edge symmetrically around the centre of the cover 7.
  • the cover may be provided with weakened areas which can easily be removed by applying a suitable tool at the construction site. This makes it possible to ensure that the ventilation opening is placed at the highest point regardless of the position of the cover 7 to secure a proper sealing.
  • An alternative method may be applied for ventilation ducts. Instead of introducing the duct through the wall for subsequent injection, a method without injection can be applied. In this method the cover 7 is provided with a transition region to the ventilation duct. After the first cover is fasrened, the ventilation duct accommodated on the transition region of the cover. Hence the ventilation duct does not need to be lead through the construction after curing of the concrete.
  • a third area of application of the present invention relates to sealing off tensioning cables in constructions of concrete.
  • the system comprises a conical end piece 5, a bushing 2 and a plug 6.
  • This application mainly corresponds to the application for forming lead-throughs for stays when shuttering walls or decks, but unlike this application the cavity behind the plug must be injected to provide the required sealing. Therefore, the plug 6 is provided with two openings 9, one for injection and one for ventilation, by the edge, symmetrically round the centre of the plug 6. This makes it possible to ensure that the ventilation opening is placed at the highest point regardless of the position of the plug 6 to secure a proper sealing and improved distribution of the injected substance.
  • the present invention may be used on all kinds of anchoring and fixing/ sealing in constructions of concrete, i.e.
  • the bushing 2 which forms the denticulations and thread like configuration will be the basic element for all these applications.
  • a further example for use is for vents. It is usual to provide an opening in the structure at the position of the vent and install the vent device by sealing with mortar or other suited material.
  • a system and method corresponding to the above embodiment related to lead-throughs of ducts may be applied, where the cover 7 may be replaced by a complete ventilation device.
  • the application will be simple and cost effective as expanding mortar or other adhesive is applied to the denticulations of the cover to arrange a complete ventilation unit in one operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The present invention discloses an arrangement for forming a bushing in concrete. The arrangement comprises a hollow spacer (3) a separate sleeve (2) with an outer thread like joggle (10) and at least one hollow end-piece (1, 4, 5), the end-piece is removed after curing of the concrete. A method for sealing a bushing formed by the arrangement is also disclosed.
PCT/NO2004/000090 2003-03-28 2004-03-29 Arrangement and method for forming a bushing in concrete WO2004085767A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20031451 2003-03-28
NO20031451A NO317849B1 (no) 2003-03-28 2003-03-28 Arrangement for gjennomforing i betong og fremgangsmate for anvendelse av samme

Publications (1)

Publication Number Publication Date
WO2004085767A1 true WO2004085767A1 (en) 2004-10-07

Family

ID=19914616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000090 WO2004085767A1 (en) 2003-03-28 2004-03-29 Arrangement and method for forming a bushing in concrete

Country Status (2)

Country Link
NO (1) NO317849B1 (no)
WO (1) WO2004085767A1 (no)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522887A1 (de) * 1975-05-23 1976-12-09 Ekkehard Friedl Stuetzkonus fuer mauerspreizen
US4186906A (en) * 1978-04-13 1980-02-05 Noboru Koga Concrete mold fastening device and tool for said device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522887A1 (de) * 1975-05-23 1976-12-09 Ekkehard Friedl Stuetzkonus fuer mauerspreizen
US4186906A (en) * 1978-04-13 1980-02-05 Noboru Koga Concrete mold fastening device and tool for said device

Also Published As

Publication number Publication date
NO317849B1 (no) 2004-12-20
NO20031451D0 (no) 2003-03-28

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