DD261267A3

DD261267A3 - FRAME FOR INTERIOR GRINDING MACHINES IN CEMENT CONCRETE

Info

Publication number: DD261267A3
Application number: DD29640586A
Authority: DD
Inventors: Winfried Berger; Alfred Gromilovich; Michael Wydra; Klaus-Peter Laupitz; Fred Schaefer
Original assignee: Werkzeugmasch Okt Veb
Priority date: 1986-11-19
Filing date: 1986-11-19
Publication date: 1988-10-26
Also published as: DE3734895A1; CH674328A5

Abstract

Die Erfindung betrifft ein Gestell fuer Innenrundschleifmaschinen aus Zementbeton, das durch seine besondere Gestaltung und Herstellungsart annaehernd die gleiche Masse und Steifigkeit hat wie bisher uebliche Gussgestelle. Dazu ist das Gestell als Zementbeton in seinem Querschnitt als doppelter Doppel-T-Traeger ausgelegt und besitzt weder eine schlaffe, noch eine verspannte Bewehrung. Die Basisflaeche ist geschliffen. An der Standflaeche des Gestells ist ein umlaufender Stahlrahmen eingegossen, an dessen Stirnflaechen Rohre angeschweisst sind.The invention relates to a frame for internal cylindrical grinding cement concrete, which has almost the same mass and stiffness as usual by its special design and manufacturing art as previously cast racks. For this purpose, the frame is designed as a cement concrete in its cross-section as a double double-T-carrier and has neither a flaccid, nor a braced reinforcement. The base surface is ground. On the Standflaeche the frame is encircled by a surrounding steel frame, are welded to the front surfaces of pipes.

Description

embodiment

Die Erifndung soll nachfolgend an einem Ausführungsbeispiel näher erläutert werden. Die dazugehörige Zeichnung zeigt in einem perspektivischen Schnitt den erfindungsgemäßen Aufbau des Betongestells. Auf dem Schnittbild sind dargestellt der doppelte Doppel-T-Aufbau 1 und die Hohlräume 2 zur Aufnahme maschinenspezifischer Baugruppen. Die Basisfläche 3 ist geschliffen. An der Standfläche des Gestells ist ein umlaufender Rahmen 4 eingegossen. Die Stirnflächen dieses Rahmens 4 weisen Rohre 5 auf, die als Transporthilfen dienen.The Erifndung will be explained in more detail below using an exemplary embodiment. The accompanying drawing shows a perspective section of the construction of the concrete support according to the invention. Shown on the sectional view of the double double-T structure 1 and the cavities 2 for receiving machine-specific assemblies. The base surface 3 is ground. On the base of the frame, a peripheral frame 4 is cast. The end faces of this frame 4 have tubes 5, which serve as transport aids.

Im Rahmen 4 sind des weiteren, auf die Ecken verteilt, vier Schlitze 6 für Befestigungszwecke und zwei Rillen 7 als Ansatzstellen für z. B. eine Brechstange vorgesehen. Dem Zementbeton werden als Zuschlagstoffe in an sich bekannter Weise glatte oder gewellte Stahldrahtstücke so beigemengt, daß eine statistische Verteilung von vier Stahldrahtstücken/cm² Querschnittsfiäche des Betongestells gewährleistet ist. Die Härte HB der Basisfläche beträgt ca. 1 000 MPa. Die notwendige statische Steife wird rechnerisch ermittelt und mit der betongerechten Gestaltung der Wandungsdicken für Stege und Ober- und Untergurte abgestimmt.In the frame 4 are further distributed on the corners, four slots 6 for fastening purposes and two grooves 7 as attachment points for z. B. provided a crowbar. The cement concrete smooth or corrugated steel wire pieces are so admixed as aggregates in a conventional manner so that a statistical distribution of four pieces of steel wire / cm ² Querschnittsfiäche the concrete support is guaranteed. The hardness HB of the base area is about 1 000 MPa. The necessary static stiffness is calculated and matched with the concrete-like design of the wall thicknesses for webs and upper and lower chords.

Durch diesen erfindungsgemäßen konstruktiven Aufbau des Gestells aus Zementbeton ergeben sich folgende wesentliche Vorteile:This constructive construction of the cement concrete frame according to the invention results in the following essential advantages:

— Die Masse des Gestells aus Zementbeton ist etwa die gleiche wie bei einem vergleichbaren Gußgestell bei gleicher Steifigkeit durch die Ausführung als doppeltes Doppel-T.- The mass of the frame of cement concrete is about the same as in a comparable cast iron frame with the same rigidity by the design as double double-T.

— Das Gestell aus Zementbeton hat etwa die doppelte Wärmekapazität bei drei- bis vierfacher Dämpfung gegenüber einem Gußgestell.- The cement concrete frame has about twice the heat capacity with three to fourfold damping compared to a cast iron frame.

— Es fehlt jede aufwendige Bewehrung auch die gleichmäßige Verteilung der Stahldrahtsjücke im Zementbeton- There is no need for any elaborate reinforcement nor the even distribution of steel wire in concrete cement

— Die Gestaltung des Betongestells in Form eines doppelten Doppel-T schafft Hohlräume für die Aufnahme maschinenspezifischer Baugruppen.- The design of the concrete frame in the form of a double double-T creates cavities for receiving machine-specific assemblies.

Claims

1. Frame for internal cylindrical grinding machines made of cement concrete, the cement concrete as aggregate smooth or corrugated steel wire pieces are so mixed that a statistical distribution of the Strahldrahtstücke / cm ² cross-sectional area of the frame is ensured, characterized in that the frame of cement concrete in its longitudinal direction as a double double -T (1) is formed with a base surface (3) that on the base surface (2) of the frame, a circumferential steel frame (4) is cast and welded to the end faces of the steel frame (4) tubes (5) and further in the steel frame ( 4) slots (6) and pockets (7) are provided.

2. frame for internal cylindrical grinding machines made of cement concrete according to claim 1, characterized in that the hardness HB of the base surface (3) is about 1 000 MPa.

For this 1 page drawing

Field of application of the invention

The invention relates to a frame for internal cylindrical grinding cement concrete, which has approximately the same mass and rigidity as previously customary Gußgestelle by its special design and production.

Characteristic of the known state of the art

It is known that machine frames are made of reinforced concrete with continuous flaccid or prestressed reinforcement. Thus, according to DD-WP 148933, DE-OS 2603637, DE-OS 3030914 and US-PS 4743396 solutions are known in which variously introduced reinforcing meshes, grids, baskets, etc. are provided of steel. They require concrete technology minimum wall thicknesses, increase the cost of production, hinder the creation of open spaces and contribute to the fact that the total mass of the concrete support about 1.5 to 3 times greater than the mass of a Gußgestells. In other known reinforced concrete beds, such. B. the DD-WP 122210, the introduction of steel reinforcement leads to improve the carrying capacity and increase the tensile strength of the concrete bed, but negatively affects the optimal cross-sectional design and largely leads to massive compact designs and thus to a significant increase in mass. According to DE-OS 2603637, reference is even made to the increase in the proportion by weight of concrete in order to achieve a good dynamic stiffness.

Object of the invention

The aim of the invention is to provide a frame for internal cylindrical grinding machines made of cement concrete, which has approximately the same mass and rigidity, as a corresponding Gußgestell.

Explanation of the essence of the invention

Based on the illustrated deficiencies of the prior art, it is an object of the invention to provide a frame for internal cemented concrete grinding machines, which is designed without continuous flabby or braced steel reinforcement and that has corresponding cavities for receiving machine-specific assemblies. This object is achieved according to the invention as follows.

The concrete bed is designed in its cross-section as a double double T-beam. On the front face a surrounding steel frame is cast. The end faces of this frame have tubes that serve as transport aids. In the frame are slots for attachment purposes and grooves as attachment points for z. B.Transportmittel provided. By means of the double doublet T cross-section according to the invention, connection assemblies, for example an internal cylindrical grinding machine, can be accommodated in the frame of cement concrete. To increase the internal tensile strength of the cement concrete smooth or corrugated steel wire pieces are so admixed as aggregate in a conventional manner that a statistical distribution of four steel wire pieces / cm ² cross-sectional area of the frame made of cement concrete is guaranteed. To fix the position of the terminal assemblies on the frame of cement concrete threaded inserts are used in the casting, which are provided at its periphery with screw grooves of certain pitch. Slope and size of the grooves are dependent on the grading curve, which must fit the respective largest grain in the groove. In order to process the base surface for receiving the other machine components economically, it is necessary that all additives of this sub-layer are the same hard and relatively soft. The hardness HB of the base area should be about 1 000 MPa. The same hardness for all aggregates is necessary for the grinding of the surface, since changing different hardness zones during grinding are known to lead to corresponding waves on the ground surface.