EP0257480A2 - Procédé de fabrication d'une pièce moulée à froid - Google Patents

Procédé de fabrication d'une pièce moulée à froid Download PDF

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Publication number
EP0257480A2
EP0257480A2 EP87111798A EP87111798A EP0257480A2 EP 0257480 A2 EP0257480 A2 EP 0257480A2 EP 87111798 A EP87111798 A EP 87111798A EP 87111798 A EP87111798 A EP 87111798A EP 0257480 A2 EP0257480 A2 EP 0257480A2
Authority
EP
European Patent Office
Prior art keywords
cold
molded part
part according
casting
tendons
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.)
Granted
Application number
EP87111798A
Other languages
German (de)
English (en)
Other versions
EP0257480B1 (fr
EP0257480A3 (en
Inventor
Michael Dr. Neumann
Lothar Dr. Preis
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.)
Bayer AG
Original Assignee
Bayer 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 Bayer AG filed Critical Bayer AG
Priority to AT87111798T priority Critical patent/ATE83969T1/de
Publication of EP0257480A2 publication Critical patent/EP0257480A2/fr
Publication of EP0257480A3 publication Critical patent/EP0257480A3/de
Application granted granted Critical
Publication of EP0257480B1 publication Critical patent/EP0257480B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/046—Post treatment to obtain pre-stressed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects

Definitions

  • the invention relates to a cold-cast molded part, in particular a thin-walled machine element with a high dynamic load capacity, consisting of a cast part produced from additives and binders, which is reinforced with reinforcement, and a method for producing the cast part.
  • tendons are used in reinforced concrete construction, which generally allow small cracks in the prefabricated part with a rarely occurring maximum load.
  • these cracks lead to the destruction of the machine element with frequent dynamic stress, such as occurs in mechanical engineering. This is particularly true for thin-walled molded parts, especially since the overlap there is inevitably low. It is also difficult to reasonably accommodate the large dimensions of mechanical anchoring parts with small dimensions of the molded parts.
  • the object of the invention is to find a molded part - in particular a machine element - and a method for its production which avoids the aforementioned disadvantages.
  • the molded part should have a low weight and structurally allow the formation of thin-walled parts without cracking or destruction due to high static or frequent dynamic stresses.
  • the molded part should be pleasing in appearance and have as few protrusions or edges as possible to avoid contamination.
  • the process should also be economical for one-off production, which is only possible with simple working methods and low investment.
  • the object is achieved in that individual tendons are arranged as reinforcement which, except for the anchoring points, are slidably mounted in a direct plastic covering even after the casting material has solidified.
  • each individual prestressed rod Due to the slidability of each individual prestressed rod in its respective plastic covering, it is possible to distribute locally occurring dynamic forces between the individual anchoring points, which are preferably at the end of the tendons, over a long distance, so that no high local stress peaks occur, causing cracks, especially in the case of thin-walled molded parts. These cracks can occur under dynamic stress on the one hand through immediate failure of the material strength or on the other hand due to structural disruption due to the brittleness of the cast materials used. Furthermore, the direct sheathing of individual tendons also allows installation within thin walls, so that they can be arranged exactly where the forces are. This creates a statically and dynamically highly resilient machine element, the dynamic fatigue strength of which can be increased three to four times.
  • tendons with a low E modulus for example Polystal®, which consists of unsaturated polyester resin with unidirectional glass fibers with a glass content of more than 70% by weight with at least one wrapping made of synthetic fibers, achieves an elongation, which is particularly suitable to compensate even larger changes in length of polymer concrete or mineral casting without significant loss of tension.
  • the plastic sheath of the tendon only needs a small thickness, since it should only prevent the direct bond at the moment of casting. After the casting material has solidified, the tendon, which contracts under the tensile force, can then move freely in the channel surrounded by the plastic.
  • the lubricity can be improved even more.
  • an air gap possibly with a spacer, or a sliding layer, for example made of petroleum jelly or silicone, are advantageous.
  • this ensures perfect sliding during tensioning or under dynamic stress.
  • the diameter of the tendon this can be anchored, for example, in polymer concrete or in polymer casting compound.
  • the resulting adhesive strength is so high that about 50-60% of the breaking strength of the tendon is achieved as an anchor.
  • the polymer masses allow a clean, corrosion-resistant, dirt-corner-free adaptation to the molded part, especially for thin-walled components.
  • the molded parts which can consist of thin-walled shells, are made from a cold-hardening casting compound, which is cast from binders (water + cement, reactive resins) and additives (minerals).
  • binders water + cement, reactive resins
  • additives minerals
  • this includes all known casting compounds such as, for example, cement-bound concretes, polymer-modified concretes, reactive resin concrete and mineral casting.
  • Polyester, acrylic, polyurethane, phenol, epoxy resins with fine fillers made from silanized quartz and / or barite flour can be used as polymer casting compounds.
  • the tendons consist of reaction resins, e.g. epoxy resins, polyester resins, polyurethane resins with unidirectionally oriented reinforcing fibers, for example glass fibers (EGlas, SGlas) with a modulus of elasticity of 40 - 60,000 N / mm2 or aramid fibers with a modulus of elasticity of 50 - 70,000 N / mm2.
  • reaction resins e.g. epoxy resins, polyester resins, polyurethane resins with unidirectionally oriented reinforcing fibers, for example glass fibers (EGlas, SGlas) with a modulus of elasticity of 40 - 60,000 N / mm2 or aramid fibers with a modulus of elasticity of 50 - 70,000 N / mm2.
  • Polyolefins, polyamides, thermoplastic polyesters, polycarbonates, thermoplastic elastomers and polyvinyl chloride can be used for the plastic jacket.
  • a molded part 1 which consists of the actual casting 2.
  • individual prestressed tendons 3 made of unsaturated polyester with unidirectional glass fibers are arranged, which are provided with a plastic covering in the central area and at the uncovered ends as anchoring points 5, 6 directly in the cold-cast casting material 7 made of binders and additives or via a casting compound 8 are fixed from poly concrete, for example.
  • a clamping device 12 is arranged on one side of the raw casting 2, with which the clamping member 3 can be tensioned.
  • the potting compound 8 is injected directly into the chamber 15 from a press 14 via a channel 13 and cured.
  • each individual tendon 3 is prestressed by means of a tensioning device 12 and cast directly via a casting compound 8 in the chamber 15 lying within the casting 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Cultivation Of Plants (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Piles And Underground Anchors (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP87111798A 1986-08-27 1987-08-14 Procédé de fabrication d'une pièce moulée à froid Expired - Lifetime EP0257480B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87111798T ATE83969T1 (de) 1986-08-27 1987-08-14 Verfahren zum herstellen eines kaltgegossenen formteils.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863629051 DE3629051A1 (de) 1986-08-27 1986-08-27 Kaltgegossenes formteil
DE3629051 1986-08-27

Publications (3)

Publication Number Publication Date
EP0257480A2 true EP0257480A2 (fr) 1988-03-02
EP0257480A3 EP0257480A3 (en) 1989-09-06
EP0257480B1 EP0257480B1 (fr) 1992-12-30

Family

ID=6308249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111798A Expired - Lifetime EP0257480B1 (fr) 1986-08-27 1987-08-14 Procédé de fabrication d'une pièce moulée à froid

Country Status (6)

Country Link
EP (1) EP0257480B1 (fr)
JP (1) JPS6367500A (fr)
AT (1) ATE83969T1 (fr)
DE (2) DE3629051A1 (fr)
DK (1) DK446387A (fr)
ES (1) ES2040716T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6187374B1 (en) 1998-09-02 2001-02-13 Xim Products, Inc. Coatings with increased adhesion

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE468481A (fr) *
US2312293A (en) * 1939-05-09 1943-02-23 George C Weiss Structural element
BE461698A (fr) * 1944-12-08
US3334850A (en) * 1965-09-24 1967-08-08 Oil And Gas Supply Company Concrete machinery base and method of making same
US3579931A (en) * 1969-09-18 1971-05-25 Du Pont Method for post-tensioning tendons
US3676968A (en) * 1970-06-01 1972-07-18 Campbell Res Corp Stressed concrete structures and method of making
DE2902296A1 (de) * 1979-01-22 1980-07-24 Focke Karl August Verfahren zur armierung von bauwerksteilen und armierung zu dessen durchfuehrung
GB2078814B (en) * 1980-06-14 1984-02-08 Crossley Andrew Neil Method of prestressing a steel concrete member
GB2089714B (en) * 1980-12-23 1984-05-31 Westerman Howard G A method of constructing a skid for heavy plant or machinery
DD210102B1 (de) * 1982-12-30 1986-11-26 Wtz Tech Textilien Dresden Bewehrtes vorgefertigtes einzelbauteil
CA1260233A (fr) * 1985-01-29 1989-09-26 Shigeo Yoshida Produit en ciment vitrifie, et sa fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6187374B1 (en) 1998-09-02 2001-02-13 Xim Products, Inc. Coatings with increased adhesion

Also Published As

Publication number Publication date
DE3629051A1 (de) 1988-03-03
JPS6367500A (ja) 1988-03-26
DK446387D0 (da) 1987-08-26
ES2040716T3 (es) 1993-11-01
ATE83969T1 (de) 1993-01-15
EP0257480B1 (fr) 1992-12-30
DK446387A (da) 1988-02-28
DE3783291D1 (de) 1993-02-11
EP0257480A3 (en) 1989-09-06

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