DE3837320A1 - Process for producing a concrete structural part - Google Patents

Abstract

A description is given of a process for producing a concrete structural part, use being made of a mould which is made up of a plurality of layers, whose outer contours correspond to the desired mould contour, if appropriate after corresponding working of the outer contours. After the concrete has set, the mould is destroyed and the finished structural part can be removed.

Description

The invention relates to a method for producing a Concrete component using a form made up of several forms layers are built up, one on top of the other, with each other connected and after machining their outer contours give the desired shape contour, whereupon the shape hollow space, if necessary after inserting reinforcement Concrete is filled and the form layers after setting of the concrete can be removed.

Be complex shaped, three-dimensional concrete parts either in precast concrete plants or at the construction site poses. Usually this is done using a model carpenter first made a formwork, whereby at certain components, for example the water inlets for water turbines, very smooth, stepless shapes Wood must be made. Then if necessary the reinforcement is brought into the form and the form is filled with concrete. After the concrete has set, the Formwork removed and the concrete component can be removed will.

However, this known method is very time-consuming especially regarding the manufacture of the mold. Is too it involves tangible costs and can only be in parts be carried out with trained specialist personnel can make such complex shapes out of wood.

Here the German patent specification 28 54 888, of which the invention runs out, a remedy has already been created.  

There the mold is made from blocks or layers, the superimposed results in the desired outer contour. The molded parts consist of rigid foam material and after setting the concrete they become whole taken. This known method can be used therefore only produce components in which all shape parts are easily accessible so that after setting of the concrete can be removed. The examples this document therefore only describe the Manufacture of conical concrete components.

In contrast, the invention is based on the object Method with the features of the preamble of patent claim 1 to design so that practically any ge formed, three-dimensional concrete components inexpensively the method according to the invention are produced can.

To achieve this object, the invention is characterized records that in a production of the molded layers made of an easily destructible material for removal after the concrete has set.

To do this, pressurized water can be applied to the mold, to which a reaction mediator may have been added.

The shape can be obtained from a Belland process Issued plastic material consist of or Mixture of plastic granules and sugar.

The mold for the production of complex, spatially shaped Concrete production parts are built up in layers,  either taking a large number of plates, into the respective recess by mechanical processes is incised and the cuts thus created on top of each other, or to save material the shape divided so that from pre-made modules (Plates, cuboids, rectangular bars, etc.) the essential Liche part of the mold can be made and only irregularly shaped parts from small module parts need to be cut out.

The parts produced in this way must be glued together and the remaining stages by an appropriate milling be adapted to the shape actually desired. The advantage of the method so far is that Production of a concrete of several cubic meters sometimes significantly less material is required for the mold than before and the processing of the form by an ent speaking processing machine much faster can be carried out because correspondingly less chip volume (This can be a few cubic meters of chip volume act).

Please note the following when choosing the material: The Material must not set the concrete in any Way and must support, possibly supported by external Metal plates or wooden structures, the weight of the introduced concrete mass without significant changes in shape can resist.

Cheap bulk plastics meet these requirements because the plastics by filling with cheap fillers, e.g. Sand that can be stretched. Acting in principle  it is an inexpensive polymer concrete.

The form can be removed after the concrete has set be solved conventionally so that the shape is mechanical destroyed and disposed of conventionally.

The following solution is both technical and economic socially attractive:

The plastic used is a plastic, made according to Belland technology, so that after setting the Concrete by spraying the mold with a special one Reaction mediators simply dissolve the form. Provided interesting in terms of cost, the resulting solution can be opened up catch and be reprocessed again, or, since none Environmental problems with Belland materials are expected released directly into the sewage system as an aqueous solution will.

Alternatively, a mixture of plastic and industrial sugar are worked. Sugar is thermo plastic and can be combined with a conventional Thermoplastics are processed into module bodies.

Since sugar adversely affects the setting capacity of concrete flows, the shape must be used when using such materials after producing the final contour with a protective film or similar be lined to prevent the filled Concrete comes into contact with the sugar.

After the concrete has set, it is contained in the plastic Washed out sugar with water.  

The remaining plastic matrix has through its Honeycomb shape so low stability that it is light can be removed. Except for easier removal is an advantage of the kilo price of industrial sugar from approx. 30 to 35 pfennigs compared to the price per kilo of approx. 2, - DM for mass plastics.

Claims (4)

1.Procedure for the production of a concrete component using a mold which is built up from a plurality of mold slots which are placed one above the other, connected to one another and, after machining their outer contours, give the desired shape contour, whereupon the mold cavity, possibly after the introduction of reinforcement, with concrete is filled and the shaped layers are removed after the concrete has set, characterized in that
that when the molded layers are made from an easily destructible material, they are destroyed for removal after the concrete has set. 2. The method according to claim 1, characterized in that
that the mold is pressurized with water, to which a reaction mediator may have been added. 3. The method according to claim 1 or 2, characterized in
that the mold is made from a plastic material manufactured using Belland technology. 4. The method according to claim 1 or 2, characterized in
that the mold is made from a mixture of plastic granules and sugar.