CS240821B1 - A sleeve for forming a thermal seal - Google Patents

Abstract

The sleeve is intended for creating a thermal joint, carried out using a thermal mixture placed in a melting crucible equipped with a pouring notch opening into the pouring hole in the sleeve with internal ribbing, placed on the connected ends of the concrete reinforcement and sealed at both ends with refractory seals. The sleeve has an external surface equipped with external ribbing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a sleeve for forming a thematic cast joint of a concrete reinforcement, in particular for joining the reinforcement of components in the assembly of prefabricated reinforced concrete structures.

The joining of the concrete reinforcement protruding from the parts of prefabricated reinforced concrete structures is mostly done by arc welding, either on a steel plate or on steel washers. This technology is very laborious and expensive, the quality of the welds is difficult to control and depends on the quality and responsibility of the chippers. Therefore, only 90% of the reinforcement in the weld must be considered. In addition, these types of welds make it difficult to access subsequent bonding joints with cementitious mortar. Considerable consumption of welding electrodes is also important. Even the thermally bonded thermal joints used do not show sufficient strength because the reinforcing steel is heated and recristalized in their vicinity, creating a zone with altered physical properties.

The above-mentioned disadvantages are overcome by a sleeve for forming a thermal joint according to the invention by means of a thermal mixture placed in a melting crucible provided with a casting notch opening into a pouring hole in the internal ribbing sleeve surrounding the joint ends of the concrete reinforcement. the outer surface is provided with external ribs.

In accordance with the prescribed thermal regime, the thin joint formed by the sleeve according to the invention can be regarded as a mechanical connection method in which the grout melts ensure, after cooling, the perfect anchoring of the joined ends of the concrete reinforcement. The sleeve with ribbed outer surface increases the grip of the cementitious concrete compound so that it participates in the transmission of forces in the joints. In particular, however, it improves the thermal mode in the immediate vicinity of the potted thermal joint, thereby favorably influencing

240 821 the cooling process, so that the joint then exhibits the same properties as an uninterrupted reinforcement bar. This makes it possible to reduce the overall cross-section of the reinforcement by 10 percent, which is one of the main advantages of the sleeve according to the invention. Other advantages include simplicity, reliability, higher work productivity, labor savings of a qualified welder, energy and welding electrode savings.

In the drawings, FIG. 1 shows the mounting of the sleeve for forming the thermal joint of the vertical bars of the concrete reinforcement, FIG. 2 shows the mounting of the sleeve for establishing the thermal joint of the horizontal bars of the concrete reinforcement.

Example

In the construction of a multi-storey building, the load-bearing structure of which was a prefabricated reinforced concrete skeleton, sleeves were used to connect the connected ends 7 of the concrete reinforcement 8 to form the thermal joint according to the invention. The thermal mixture 1 was placed in a melting crucible 2 provided with a casting notch 3 opening into a pouring hole 4 in a sleeve 5 provided with internal ribs 6 and external ribs 10, mounted on the joint ends 7 of the concrete reinforcement 8, the pit 5 being sealed with refractory seals 9. The ignited termite-based thermal composition 1 flowed after the baffle located in the bottom of the crucible 2 through the casting notch 3 and through the orifice 4 into the interior of the sleeve 5 after filling the crucible 2 and the casting notch 3 was removed. In the same way, the other joined ends 7 of the concrete reinforcement 8 of the joint were joined, which were then filled with grout cementitious concrete, to which the thermal joint sleeve 5 adhered perfectly due to the external ribs 10. The performed joints acted as perfect mechanical joints, so it was not necessary to consider only 90% of the bearing capacity of the connected reinforcement bars. On average, 5 kg of steel, 0.8 Nh of work by a qualified welder and 3.2 kWh of electricity were saved on one joint.

The sleeves for creating thermal joints can also be used for joining larger steel reinforcement profiles of monolithic buildings.

Claims (1)

SUMMARY OF THE INVENTION 240 821 A sleeve for forming a thermal joint, by means of a thermal mixture, placed in a crucible provided with a casting notch opening into a pouring opening in a female rib sleeve, fitted to the jointed ends of the concrete reinforcement and sealed at both ends with refractory seals. external ribbing (10).