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
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/0002—Auxiliary parts or elements of the mould
  • B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
  • B28B7/0017—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps for attaching mould walls on mould tables
• • 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
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
  • B28B7/0035—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding
• • 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
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
  • B28B7/42—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for heating or cooling, e.g. steam jackets, by means of treating agents acting directly on the moulding material

Definitions

• the subject of this invention is a method for the manufacture of cast concrete products in which the concrete is poured into a casting mould, after a suitable period of time the mould is removed from around the concrete product and the concrete product is then moved on for possible further processing.
• moulds are constructed from material suitable for the purpose and the moulds can be assembled and dismantled such that the same mould can be used over and over again in the manufacture of concrete products.
• the moulds or parts of the moulds are removed from around the concrete product once the concrete product has sufficiently set. Whenever the components of the moulds are dismantled after each casting and then reassembled prior to the ensuing casting, they can sometimes be damaged or develop excess tolerance due to wear. In these circumstances the dimensions of the mould are not very accurate. In addition to this, considerable time is spent on assembling and dismantling procedures. This is expensive and the manufacture of concrete products using this method is very time consuming.
• the purpose of this invention is to provide a method of manufacturing cast concrete products which can be utilised to eliminate the unsatisfactory aspects of the methods currently in use.
• the purpose of this invention is to provide a method which, when put into use, can produce a significant increase in the level of production capacity achieved using present methods and which can achieve a noticeable reduction in the handling time of the moulds.
• the purpose of the invention is to provide a method which, when put into use, will produce a significant improvement in the accuracy of the measurements of the moulds compared with present methods.
• the material used in the casting mould is made from a thermally expanding material.
• the temperature of the mould is altered following the casting of the concrete such that the size of the mould changes as a result of the thermal expansion and the mould and/or the concrete product are moved in different directions to each other to remove the concrete product from the mould.
• the adjustment to the temperature of the mould after the casting of the concrete causes the thermally expanding material to react by either expanding or contracting to the extent that a small gap forms between the concrete and the mould. This makes it possible for the mould to be removed from around the concrete product as a whole by raising it immediately after the concrete has set sufficiently or the concrete product can be removed from the mould.
• the concrete product is then moved on, possibly for further processing, and the next concrete product can then be cast immediately so that use can be made of the mould on a continuous basis.
• Working time is reduced significantly and production capacity is increased when there is no time consumption in the assembly and dismantling of the mould.
• the measurements of the concrete product are also accurate.
• the temperature of the mould is raised after casting by heating the mould.
• the mould When the mould is warmed up it undergoes a thermal expansion and shifts slightly away from the surface of the concrete.
• This method can be applied in such situations where the casting mould envelopes the concrete and the cast concrete is situated within the mould.
• the heating of the mould can be achieved by the use of various types of equipment which are especially suited for this purpose.
• the mould can be heated as an entire unit, for example, by using a suitable warming intermediate agent such as a hot liquid which is fed through the inside of the mould via suitable channels, tubes or other similar means.
• the temperature of the mould is reduced after the concrete has been cast by cooling the mould.
• This method can be used in the situation where the mould is surrounded by the concrete. After the mould is cooled the mould contracts a little and the mould or the concrete product can be lifted away.
• This kind of mould is used, for example, when forming voids in the middle of a concrete product such as for door and window openings or other kinds of openings.
• the cooling is also carried out in this situation in a conventional manner by feeding a cooling intermediate agent either to the mould or to channels either inside it or on its surface or by other suitable means or by cooling the mould by some other means.
• heat transmission equipment is connected to the mould which is used to adjust the temperature of the mould.
• This kind of equipment can be, for example, channels or the equivalent with which the intermediate agent is fed into the mould and removed from it. It is also possible to use, for example, heating or cooling cables or the equivalent.
• Figure 1 demonstrates an application of the equipment viewed from above as an arrangement of the method according to the invention
• figure 2 demonstrates the application described in figure 1 viewed from the side
• figure 3 demonstrates a second application of the equipment viewed from above as an arrangement of the method
• figure 4 demonstrates the equipment in a third arrangement of the method.
• the equipment shown in figures 1 - 3 there is a stiff frame form 2 situated on the flush mould 1 into which the concrete 4 is cast when manufacturing the concrete product.
• the arrangement shown in figure 3 also includes forms for window and door openings 3 situated within the mould 2.
• the casting of the concrete is carried out in this equipment in the conventional manner by feeding the cast concrete into the space between the mould and the forms for the window and door openings and by allowing the concrete to set.
• a base 5 is placed inside the frame mould 2.
• This base can be moved in a vertical and/or horizontal direction with respect to the frame mould.
• the frame mould 2 consists of high side walls 6 and a base board 7 on which the base 5 is positioned.
• This kind of equipment can be used to facilitate the manufacture of pillars or similar constructions.
• the base can be equipped with wheels or with lifting equipment.
• heat transmission equipment (not shown in the figure) is connected to the mould 2 with which the temperature of the mould can be increased.
• heat transmission equipment (not shown in the figure) is connected to the outer mould 2, with which the temperature of the mould can be increased, and heat transmission equipment (not shown in the figure) is connected to the forms for the window and door openings, with which the temperature of these moulds can be decreased by cooling them.
• the cast concrete is fed into the inside of the moulds. Once the concrete 4 has set sufficiently the outer moulds 2 are heated, and in the arrangement shown in figure 3, the inner moulds 3 are cooled at the same time such that the moulds, having thermally expanded or contracted, shift away from the cast concrete. In the arrangement shown in figure 4 it is sufficient for just the base to be heated when, as a result of its heat expansion, the side walls attached to it shift away from the concrete product.
• the temperature difference during the casting and heating time can be around 100°C depending on the invention arrangements where, for example, if the temperature of the cast concrete is 30°C the temperature of the cast mould is raised to around 120-130°C. This results in sufficient heat expansion in, for example, steel. Other temperatures and suitable materials can also be used in different arrangements.
• the moulds 2, 3 separate from the concrete products a small gap is created between the concrete product and the moulds.
• the moulds can be removed as a whole from around the concrete product by lifting them away or, in the arrangement shown in figure 4, alternatively moving them in a sideways direction. It is also possible to keep the moulds in position and to remove the concrete products. This method results in a significant increase in the production capacity and reduces the time required in handling the moulds.
• the invention is not limited to the advantageous arrangements shown but can vary within the framework of the invention concept formed by the patent claims.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Mechanical Engineering (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Ultra Sonic Daignosis Equipment (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
• Moulds, Cores, Or Mandrels (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8545327

Family Applications (1)

Country Status (9)

Families Citing this family (1)

Family Cites Families (4)

• 1996
  • 1996-02-07 FI FI960551A patent/FI960551A0/fi unknown
• 1997
  • 1997-02-06 EP EP97902383A patent/EP0880432B1/de not_active Expired - Lifetime
  • 1997-02-06 AT AT97902383T patent/ATE225241T1/de not_active IP Right Cessation
  • 1997-02-06 DE DE69716039T patent/DE69716039D1/de not_active Expired - Lifetime
  • 1997-02-06 WO PCT/FI1997/000069 patent/WO1997028940A1/en not_active Ceased
  • 1997-02-06 PL PL97328090A patent/PL328090A1/xx unknown
  • 1997-02-06 AU AU16045/97A patent/AU1604597A/en not_active Abandoned
  • 1997-02-06 ES ES97902383T patent/ES2184988T3/es not_active Expired - Lifetime
  • 1997-02-06 IL IL12559497A patent/IL125594A/xx not_active IP Right Cessation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events