EP0309606A1 - Panneau de coffrage en béton - Google Patents

Panneau de coffrage en béton Download PDF

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Publication number
EP0309606A1
EP0309606A1 EP87114346A EP87114346A EP0309606A1 EP 0309606 A1 EP0309606 A1 EP 0309606A1 EP 87114346 A EP87114346 A EP 87114346A EP 87114346 A EP87114346 A EP 87114346A EP 0309606 A1 EP0309606 A1 EP 0309606A1
Authority
EP
European Patent Office
Prior art keywords
panel
polymeric material
wood based
concrete form
product
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Withdrawn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
EP87114346A
Other languages
German (de)
English (en)
Inventor
Leonard J. Annaloro
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.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
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 Weyerhaeuser Co filed Critical Weyerhaeuser Co
Priority to EP87114346A priority Critical patent/EP0309606A1/fr
Publication of EP0309606A1 publication Critical patent/EP0309606A1/fr
Withdrawn legal-status Critical Current

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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
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/02—Forming boards or similar elements
    • E04G9/05—Forming boards or similar elements the form surface being of plastics
    • 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
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/02—Forming boards or similar elements
    • E04G2009/023—Forming boards or similar elements with edge protection

Definitions

  • This invention relates generally to relatively large flat panel products that are used to create the form structure or mold for supporting a concrete pour during the pouring and curing stage. More particularly, it relates to a composite wood based panel product with improved stiffness and durability properties for use as a concrete form or mold member.
  • One commercially available plywood based composite concrete form panel is the overlaid product where resin impregnated heavy paper is overlaid against the surfaces of the plywood substrate and then cured to form the so-called medium and high density overlaid concrete form panel products.
  • another new product has been introduced with greater strength properties than typical treated plywood simply by adding additional layers of veneer so that the multilayered product has from 10 to 15 layers of veneer.
  • This plywood panel product then is sealed on both faces by the impregnation of phenolic resins prior to the application of phenolic plastic faces applied in a hot press. The edges in this concrete form panel product are sealed to inhibit moisture penetration.
  • a new composite wood based panel product has been introduced recently that has now been found to make an excellent substrate for the manufacture of composite concrete form panel products.
  • Problems with existing concrete form panel products also include the lack of complete moisture resistance, the lack of structural stiffness, and cost. It has been found with the product of the present invention that enhanced properties are generated as are lower manufacturing costs to produce a very stiff, moisture resistant, highly reusable, durable concrete form panel product.
  • one object of the present invention is to provide a stiffer concrete form panel product and one that is capable of being reused time and time again.
  • a further object of the present invention is to provide a completely sealed wood based substrate that utilizes components specifically selected for contact with concrete.
  • this invention is practiced in one form by encapsulating or completely covering the surfaces of a wood based panel product that has predetermined stiffness properties greater than those of state-of-the-art wood based substrates.
  • the encapsulation includes at least a polymer overlay with the polymer of choice being a vinyl material covering both large surfaces and affixed to the underlying wood faces with en epoxy based adhesive.
  • the polymeric material has incorporated therein a concrete release agent.
  • the polymeric material is stabilized to the exposure of ultraviolet radiation.
  • the four edges are also covered with a polymeric material, preferably vinyl, and adhered thereto with a hot melt type of adhesive.
  • the resulting product is the completely encapsulated wood based concrete form panel product.
  • FIG. 1 the planar form of the composite wood based concrete form panel product is generally indicated at 10.
  • the most typical size for these concrete form panel products is 4′ x 8′.
  • the present product can be manufactured in different sizes, particularly in view of the type of wood based substrate that is used in its manufacturing process.
  • the wood based substrate material is a commercially available product manufactured and sold by the assignee of the present invention under the trademark "STRUCTURWOOD" and includes at least three distinct layers with each layer comprised of oriented strands of wood particles bonded together with a phenolic based adhesive system.
  • These wood based panel products are generally referred to in the industry as oriented strandboards or oriented flakeboards.
  • the suitable adhesive Prior to orienting the strands in the respective layers, the suitable adhesive is incorporated either as a spray or in other suitable form so that once the loosely compacted mat is formed it may then be directed to the pressing apparatus for consolidation and curing of the adhesive. Upon the application of heat and pressure in the press for a sufficient time, the resin cures and the panel is pressed to its final predetermined thickness at the preselected density.
  • these types of panel products can be manufactured in varying thicknesses depending upon the ultimate end use and additionally, they can be pressed into various widths and lengths depending upon the dimensions of the press being utilized.
  • Plywood panels are generally pressed to the typical 4′ x 8′ size in a multi-­opening vertically stacked press.
  • the oriented strand panel product has very good properties.
  • the wood based substrate used in the manufacture of the present improved product directly yields the increased stiffness values for the completed composite concrete from panel product.
  • Another advantage in utilizing an oriented strand type product for the substrate is the uniformity in the surface, flatness and appearance owing to the use of the strands and pressing process. When using plywood type substrates, oftentimes there are knot holes and other defects present in the surface layers which can carry visual defects into the surface of the finished concrete.
  • the definitive layers of oriented strand material are designated by reference numerals 12, 14 and 16.
  • the individual strands in core layer 14 run substantially perpendicular to those in outer layers 12 and 16.
  • both upper and lower flat surfaces will have securely attached thereto a polymeric material covering the entire surface and depicted as polymeric layers 18 and 20.
  • the long side edges are also covered with a layer of the same polymeric material with the long strips being indicated at 22 and 24.
  • Suitable adhesive which in the preferred embodiment is a hot melt epoxy type adhesive that is highly moisture resistant and provides a complete bond between the polymeric material and the surface of the wood based substrate.
  • suitable adhesive Any suitable method for attaching the polymeric surface layers to the wood based substrate may be utilized, such as by spraying or rolling the epoxy adhesive on the wood surfaces and then laminating the polymeric material thereto.
  • the adhesive is coated onto the polymeric material and then laminated to the substrate.
  • the polymeric material is selected from commercially available vinyl and is selected, in part, based on its thicknesses.
  • the thickness of the vinyl material is .020 inches while in another embodiment the polymeric material is a thickness of .030 inches.
  • Incorporated into the polymeric material should be a suitable release agent for allowing the concrete form panel product to easily separate from the concrete.
  • the polymeric material should be suitably stabilized by an ultraviolet treatment to reduce degradation from sunlight since in the past radiation from the sun tends to cause blistering and delamination in composite state-of-the-art concrete form panel products.
  • the polymeric surface layers will be smooth providing a smooth surface against the concrete being cured.
  • additional texturing material can be added to the polymeric material to provide an antiskid surface to the surface layers of the concrete form panel product. These will normally be added to the polymeric material that is thicker and, of course, when incorporated and used at a construction site will result in improved antiskid properties.
  • the polymeric material is shown being applied to one large surface and having edges extending outwardly which are then wrapped upwardly to encapsulate the longer side edges of the wood based substrate material.
  • the upper surface 18 has affixed thereto a single sheet of polymeric material that dimensionally will coincide with the dimensions of the wood based substrate material but with some added to overlap the narrow edges of the polymeric material that extends along the long edges of the wood based substrate. With such a product, there are no joints in the polymeric material along the edges on one surface of the wood based substrate.
  • the upper and lower larger surfaces and the long side edges of the wood based substrate are covered with the polymeric material that covers the respective surfaces.
  • individual strips 26 and 28 of polymeric material will be used but all individual pieces of polymeric material will be sized so that when the composite product is complete, while there will be joints, the wood based substrate material will be completely encapsulated by polymeric material. This encapsulation process results in the completely covered wood based substrate that is highly resistant to moisture penetration and adds significantly to the useful life of the wood based concrete form panel product.
  • suitable polymeric materials in particular, special sheet vinyl products are commercially available from suppliers such as B. F. Goodrich, as are the suitable adhesive products and, in particular, epoxy type products which are available from manufacturers such as Daubert Chemical Co.
  • a liquid polyurethane based sealer should be applied to the exposed edge to re-encapsulate the entire wood based substrate.
  • suitable liquid polyurethane sealers are commercially available and may be obtained from a manufacturer such as Daubert Chemical Co.
  • stiffness comparisons are presented for several different product thicknesses with the product constructed according to the present invention having the values in the column identified as STRUCTURWOOD.
  • the column identified as Reg HDO represents values for a high density overlaid type concrete panel product while the column identified as MDO B-Matte is a medium density overlaid product.
  • the three columns, Class 1, Class 2, and Struc-I under the column identified as BB Plyform Grades represent the more typical plywood type concrete form panel products that have the wood surfaces treated but not overlaid with any additional material.
  • the column identified as Finn Form shows the values for a plywood type substrate having 10-15 veneer layers and then having additional plastic faces applied thereto. TABLE IV STIFFNESS COMPARISONS EI in sq.
  • the oriented strand type substrate material Due to the overall lower cost of the oriented strand type substrate material, tougher more durable polymeric sheet material can be used, together with the epoxy type adhesives, resulting in an overall stiffer and more durable concrete form panel product capable of significantly greater reusability at reasonable prices.
  • the type of composite structure of the wood based substrate no gaps or wood grain will appear on the surface of the concrete.
  • the oriented strand type of wood based panel can be manufactured in longer lengths (longer than the typical 8-foot length for plywood panels), longer composite products made according to the present invention can be fabricated which can then result in fewer joints appearing along the surface of the concrete being formed.
  • the wood based substrate material is completely encapsulated by the polymeric material, moisture buildup is substantially eliminated, thereby adding to the life of the product and increasing the reusability.
EP87114346A 1987-10-01 1987-10-01 Panneau de coffrage en béton Withdrawn EP0309606A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87114346A EP0309606A1 (fr) 1987-10-01 1987-10-01 Panneau de coffrage en béton

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87114346A EP0309606A1 (fr) 1987-10-01 1987-10-01 Panneau de coffrage en béton

Publications (1)

Publication Number Publication Date
EP0309606A1 true EP0309606A1 (fr) 1989-04-05

Family

ID=8197328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114346A Withdrawn EP0309606A1 (fr) 1987-10-01 1987-10-01 Panneau de coffrage en béton

Country Status (1)

Country Link
EP (1) EP0309606A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6722091B1 (en) * 1998-12-18 2004-04-20 Robert J. Leslie Residential homes having tensioned curved wall panels

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2041881A1 (de) * 1970-08-24 1972-03-02 Continental Gummi Werke Ag Verfahren zur Herstellung einer Schalungsplatte
DE2305797A1 (de) * 1973-02-07 1974-08-08 Anton Krogner Schalungsplatte
FR2251688A1 (en) * 1973-11-17 1975-06-13 Hauser Roland Concrete formwork sheets - made by surfacing wood based cores with impregnated fibreglass
US4076569A (en) * 1976-04-14 1978-02-28 Arnold Buchbinder Process for upgrading plywood panels
DE3117861A1 (de) * 1981-05-06 1982-11-25 Friedrich 7250 Leonberg Eger Schaltafel fuer die aufnahme von aushaertbaren baumaterialien
DE8525341U1 (fr) * 1985-09-05 1987-01-08 Alkor Gmbh Kunststoffe, 8000 Muenchen, De

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2041881A1 (de) * 1970-08-24 1972-03-02 Continental Gummi Werke Ag Verfahren zur Herstellung einer Schalungsplatte
DE2305797A1 (de) * 1973-02-07 1974-08-08 Anton Krogner Schalungsplatte
FR2251688A1 (en) * 1973-11-17 1975-06-13 Hauser Roland Concrete formwork sheets - made by surfacing wood based cores with impregnated fibreglass
US4076569A (en) * 1976-04-14 1978-02-28 Arnold Buchbinder Process for upgrading plywood panels
DE3117861A1 (de) * 1981-05-06 1982-11-25 Friedrich 7250 Leonberg Eger Schaltafel fuer die aufnahme von aushaertbaren baumaterialien
DE8525341U1 (fr) * 1985-09-05 1987-01-08 Alkor Gmbh Kunststoffe, 8000 Muenchen, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6722091B1 (en) * 1998-12-18 2004-04-20 Robert J. Leslie Residential homes having tensioned curved wall panels

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Inventor name: ANNALORO, LEONARD J.