DE1240110B - Method for the frictional connection of concrete components, in particular concrete slabs - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

EOIc

German class: 19 c -11/14

Number: 1240110

File number: C 30 132 V / 19 c

Filing date: June 7, 1963

Open date: May 11, 1967

The invention relates to a method for non-positive connection of concrete components, in particular Concrete deck slabs, using fiberglass reinforced synthetic resin binders.

The transmission of tensile and shear forces in concrete construction is mainly achieved through steel inserts. If concrete components are to be connected to one another in a non-positive manner, this is only possible below difficult circumstances possible. In the existing or to be worked out joints or recesses the steel inserts must be arranged so as to be overlapped and / or welded to one another. Possibly additional steel inserts must be introduced (German Auslegeschrift 1057155).

It is also known to positively connect concrete components with synthetic resins by using the Pour the joints with synthetic resin mortar and add glass fibers for reinforcement (Kunststoffe, 52, 1962, Issue 11, p. 660). Here, the force-transmitting synthetic resin layer with the glass fibers in place and ao Place applied or introduced into the joints. There is a risk that the glass fibers during break the training and that thereby the connection point is not the one calculated in advance Has solidity. Besides, it is by no means as to achieve that the fiberglass-reinforced synthetic resin layer achieves optimum strength, as on the On the construction site, a glass content of more than about 40% cannot easily be achieved. This uncertainty leads to oversizing, which ultimately leads to excessive consumption of high-quality glass fibers has the consequence.

To avoid these disadvantages, i. H. A firm and reliably calculable joint connection with little effort to obtain is the object of the present invention.

This object is achieved in that on the surfaces of with the formation of a butt joint composite concrete components or from cracked concrete components prefabricated, cut to length, highly filled Resin molded parts are glued over the butt joint or the crack.

The term concrete components is to be understood as meaning, for example, slabs, blocks, beams, supports, posts made of concrete, which may contain steel inserts. These concrete components are to be connected to one another in a force-transmitting manner using the method according to the invention. The most common application arises with larger concrete slabs, such as. B. Pavement slabs. In addition, arbitrarily dimensioned concrete components can be frictionally interlocked with one another by the method characterized in the claims, resulting in a frictional connection method
of concrete components, in particular
Concrete slabs

Applicant:

Chemical works Hüls Aktiengesellschaft, Mari

Named as inventor:
Dipl.-Ing. Dr. Guido Trittler,
Friedrich Groche,
Dipl.-Ing. Dr. Ernst German,
Dr. Karl-Heinz Seemann,
Dipl.-Ing. Herbert Liesegang, Mari

connect if they have sufficiently large adhesive surfaces for the prefabricated synthetic resin molded parts to be glued exhibit.

The synthetic resin molded parts that create the actual connection between the elements are rods, pipes or profiles made from synthetic resins such as thermosets, especially polyester resins, which are made of fillers such as glass fibers or synthetic fibers such as polyamide or polyester threads , can be added in amounts of 60 to 75%. Glass fiber reinforced synthetic resin profiles are particularly suitable. B. can be produced by the extrusion process. They are preferably made of 70% fiberglass and 30% polyester resins, e.g. B. the polyester resin known under the trade name VESTOPAL A from Chemische Werke Hüls AG, Marl. Such particularly bending and stretch-resistant profiles of round, square or rectangular cross-section are referred to as "fishing rods". Other profiles, such as angles or I-profiles or those with an oval cross-section, are also suitable. The tensile strength of these profiles is 70 to 100 kp / mm ² , while z. B. structural steel I only has values of 35 to 50 kp / mm ² , so that significantly smaller dimensions are required as a further advantage when using these profiles.

Coefficient of thermal expansion ..
Elongation at break

Rebar

about 12 · 10- «
about 18 ⁰ zo

Synthetic resin profiles

about 6 · 10- ⁶ about 2%

709 579/67

Claims (1)

In addition, there are also favorable conditions when comparing the coefficient of thermal expansion and elongation at break. The dimensioning of the synthetic resin profiles results from the tensile forces to be absorbed and from the shear forces to be transmitted in S of the adhesive surface in relation to the corresponding permissible stresses. According to today's building regulations, the permissible shear stress in reinforced concrete is around 18 kp / cm2. With synthetic resin mortar, such. B. Polyester mortar based on VESTOPALA, the compressive strength is around 1000 kp / cm2, the tensile strength around 100 kp / cm2. The shear strength of this synthetic resin mortar is about 35 kp / cm2, and the flexural strength is about 250 kp / cm2. This information about the properties of cast resin mortars shows how advantageously they can be used for frictional connection of concrete components. Using the A b b. 1 and 2 the method according to the invention is explained. If two concrete components 5 and 6 are to be connected to one another, they are aligned with one another in such a way that the butt joint 1 is created. In the case of broken or cracked concrete parts, the crack corresponds to butt joint 1. On both sides of the joint and, if possible, on the side of the concrete components subjected to tensile stress, either directly on the straightened and cleaned surface or in a few recesses 3 several millimeters deep, the prefabricated, cut to length Synthetic resin molded parts 2 and 4 applied or embedded by means of synthetic resin mortar, if necessary after a primer has been applied beforehand. Polyester or epoxy resins are usually suitable as synthetic resins for the mortar. As in A b b. 2, the synthetic resin molded parts are not only arranged at right angles (2) to the course of the joint. Often it is better to choose other angles (4) because of the forces to be transmitted. The remaining part of the joint can be filled with synthetic resin mortar. So-called wear layers, for example made of asphalt or as a plastic screed, can also be applied to the actual connection point. With the present method, concrete components can be connected to one another in a non-positive manner in a simple manner. In addition, the present method allows cracked concrete roadway slabs to be repaired in a very economical manner, in particular on the motorway. The main advantage of this method is that once cracks have occurred, they can be clamped and glued in place without significant expenditure on equipment. B. Water and possible frost damage can be avoided. Patent claims: 1. Method for the positive connection of concrete components, in particular concrete deck slabs, using glass fiber reinforced Synthetic resin binders, dadurchgekennz eich η et that on the surfaces of under Formation of a butt joint (1) composed of concrete components (5, 6) or of cracked concrete components (5,6) prefabricated, cut to length, highly filled synthetic resin molded parts (2,4) over the butt joint (1) or glued over the crack. 2. The method according to claim 1, characterized in that in the surface of the to be connected Concrete components (5, 6), recesses (3) for receiving the cut-to-length synthetic resin molded parts (2, 4). 3. The method according to claim 1 and 2, characterized in that the synthetic resin molded parts (2 or 4) at right angles to the course of the butt joint (1) or the crack or offset from one another Directions are arranged. Considered publications:
German Auslegeschrift No. 1057155;
"Kunststoffe", 1962, No. 11, pp. 660, 665. 1 sheet of drawings 709 579/67 5.67 © Bundesdruckerei Berlin