Structura si designul rosturilor pentru dilatatii HCJ Cosinus Slide

Limba: Engleza

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Tip documentatie: Catalog, brosura

Pagina 1 - Structura si designul rosturilor pentru dilatatii HCJ Cosinus Slide Catalog, brosura...

Page 1 Regarding the Formation and Design of Joints in Industrial Flooring Dimension of Usability by Joint Geometry Stefan Kordts and Jens Peirick Summary Modern production and logistics companies require functional industrial floors for an economic and timely operation. Industrial flooring is functional if it can safely absorb the loads applied to it, for example by shelving, goods, machinery and traffic. This is considered as part of the stability verification. Furthermore, the industrial flooring must be fit for use. This is achieved by a flat, wear-resistant base having a small number of cracks and defects, and an optimized number of systematic weak points, e.g. in the joint area. With that, a lowmaintenance and functional operation of the floor is ensured, which provides supports of the industrial flooring and a service life of industrial forklift trucks and their tyres. Therefore, most of this industrial flooring is implemented in concrete design, as it offers many advantages f

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Pagina 2 - Structura si designul rosturilor pentru dilatatii HCJ Cosinus Slide Catalog, brosura...

or this application. One problem is the design of the joints between the fields. Due to structural raptures, damages can be frequently detected here, which subsequently reduces the usability of the industrial flooring. It is possible to summarize the impacts on the industrial flooring and to dimension the flooring, with technical regulations and a comprehensive state of the art. This includes both, the load-free impacts, such as shrinkage, creep and restraint stresses from discharged hydration heat, and load-controlled impacts, such as point loads of shelving, area loads from the use and dynamic loads of industrial forklift trucks. This leads to choosing a reinforcement type, a concrete strength class, and component strength and component size. The rules do not explicitly address the joint formation. Two problems emerge here: I) Description of the shock event The DIN EN 1991-1-1 "Euro code 1: Impacts on structures - Part 1-1: General actions on load-bearing structures - Densities, se

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lf-weight and imposed loads for buildings, German version EN 1991-1-1:2002 + AC: 2009" knows truck categories that take the forklift weight into account. These include calculated contact surfaces, which then create defined pressures (or contact pressures) on the base slab. The standard implies a contact area of 20 cm x 20 cm, reflecting pneumatic tyres. However, in reality vehicles with synthetic tyres with smaller contact areas are used. As a result, the contact pressure immediately increases significantly. Figure 1 shows the impact of the contact area of the industrial forklift truck on the base slab's contact pressure and its difference, on the one hand, how it is captured arithmetically and, on Page 2 the other, how it occurs in reality. If the mass is moved, an impact stress is created on the joint edge, during regular crossing with a linear joint. It is dependent on the size and hardness of the wheels, the mass of the truck and its load, the joint gap width and the speed of th

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e mass. The impact is greater, the smaller and harder the wheels are, the higher the mass of the forklift and its load, the greater the crossed joint gap and the faster the mass passes over the joint. Figure 2 shows the impact of the tyres and the speed of the shock stress of a joint, when assuming a joint gap of 15 mm. This implies that the shock stress increases exponentially, with a decreasing wheel diameter and increased speed with the same mass. Figure 3 illustrates this effect again. These factors and the resulting increase in activity on the industrial flooring and the joint area are not taking into account by the existing load. 25 Forklift pneumatic Stapler luftbereift tyres (contact area 20 x 20cm²) (Aufstandsfläche 20x20 cm²) 20 Forklift synthetic tyres Contact pressure inin N/mm² Kontaktdruck N/mm² Stapler kunststoffbereift (contact area 2 x 10 cm²) (Aufstandsfläche 2x10 cm²) 15 10 5 0 FL1 FL2 FL3 FL4 FL5 Staplerkategorie gemäß DIN EN 1991-1-1 Forklift

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category pursuant DIN EN 1991-1-1 Fig. 1: Tyres effect on the contact pressure of the floor slab with different forklift categories FL6 Page 3 30 5 5 km/h diameter of wheel 30 cm,luftbereift tyres km/h Raddurchmesser 30 cm, pneumatic 25 eines Fugenspalts von 15 mm kN with assumption of joint gap of 15 mm Impact stress inStoßbeanspruchung in kN bei Annahme 1515 km/h diameter of wheel 30 cm, pneumatic tyres km/h Raddurchmesser 30 cm, luftbereift 5 5 km/h diameter of wheel 10 cm,kunststoffbereift km/h Raddurchmesser 10 cm, synthetic tyres 1515 km/h diameter of wheel 10 cm, synthetic tyres km/h Raddurchmesser 10 cm, kunststoffbereift 20 15 10 5 0 FL1 13,0 kN FL2 20,0 kN FL3 31,5 kN FL4 45,0 kN Staplerkategorie gemäß DIN EN 1991-1-1 Forklift category pursuant DIN EN 1991-1-1 Fig. 2: Impact effect on the linear joint profile edges contingent on the diameter of the wheel and speed Page 4 Fig. 3: Vector representation shock event on the joint face contingent on the d