RU2192382C2 - Rail-and-beam structure - Google Patents

Abstract

FIELD: transport structures. SUBSTANCE: invention relates to reconstruction and construction of crane runway structures designed for heavy duty operation. Proposed structure has crane runway beam, triple-head rail and brake beam with channel profile in zone of connection with crane runway beam. Upper part of crane runway beam is of rolled cross-shaped section with vertical member intersecting at right angle with horizontal chute-shaped member. The latter is provided with horizontal sections from left and right sides connected with triple-head rail by hollow rivets with fitted-in cores to form common unit. Upper end face of vertical member is in contact with foot of triple-head rail. Lower end face is connected with wall of beam provided with flanged upper edge forming longitudinal rib. Channel section is arranged between corresponding horizontal section of chute- shaped member and longitudinal rib connected with brake beam into common unit by means of hollow rivets with fitted-in cores. EFFECT: increased service life and improved repairability of crane runway structure, reduced labor input at manufacture and in service. 2 dwg

Description

 The invention relates to the reconstruction and construction of crane transport facilities mainly of heavy, intensive operation (8K, 7K), for example, converter and open-hearth metallurgical shops.

Known metal crane structure containing a crane beam and a rail mounted on it by means of double-sided bent shock absorbers. The upper belt is made by a closed loop in the form of a horizontal sheet and two bent pads of a tray-like shape with mutually perpendicular end sections attached by friction pins to the belt and the beam wall, respectively, and the latter divides the closed loop into two compartments and contacts the bottom edge of the beam with the upper belt [1] . We will take this decision as a prototype. The disadvantages of the prototype is the high complexity of the crane structure and the transfer of horizontal forces T from the crane wheels with an eccentricity equal to the rail height h _p , resulting in a concentrated local torque
M _cr = T • h _p ,
reducing the durability of the crane structure.

 For an analogue, we take patent RU 2141547 C1, 11/20/99.

 The technical result of the invention is to increase the durability and maintainability of the crane structure and reduce the complexity of its manufacture and maintenance.

 It is achieved by the fact that the upper part of the crane beam is made of a rolled cross-shaped profile containing a vertical element intersecting at right angles with a horizontal tray-shaped element provided with horizontal sections on the left and right connected with hollow rivets with a three-headed rail with integrated cores into a single unit. The upper end of the vertical element is in contact with the sole of the three-headed rail, the lower end is connected to the wall of the beam, which has a flanged upper edge forming a longitudinal rib. In this case, the channel profile is placed between the corresponding horizontal section of the tray-like element and the longitudinal rib, which are connected to the brake beam as a whole by hollow rivets with embedded cores.

 Comparison with the prototype shows that the claimed device is characterized in that the upper part of the crane beam is made of rolling cross-shaped profile containing vertical and tray-like elements, rail mounting is simplified, material consumption is reduced.

 Thus, the claimed device is significantly different from the prototype.

 In FIG. 1 shows a sectional rail and beam structure; figure 2 is a side view.

 The rail and beam structure contains a three-headed rail 1, a rolling cross-shaped profile 2, which functions as the upper belt of the main crane beam 3, and a brake beam 4 connected by friction joints 5, for example, hollow rivets with embedded cores [2].

 The rolled cross-shaped profile contains a vertical element a, intersecting at right angles with a horizontal tray-like element b, symmetrical about the vertical axis y and provided with horizontal sections contacting with the sole of the three-headed rail.

 The upper end face of the element also contacts the sole of the three-headed rail along the y axis. The upper longitudinal edge of the wall of the crane beam 3 is flanged on a bending machine along the entire length and forms a longitudinal rib d.

 The brake beam 4 is provided in the connection zone with the main beam 3 with a channel section i and an external belt k.

 The three-headed rail 1, the cross-shaped profile 2, the crane beam 3 and the brake beam 4 are connected together by friction joints 5 and as a result of this, three closed tubular cavities arise: two between the three-headed rail 1 and the cross-shaped profile 2 and one between the longitudinal rib d and the channel i brake beams 4. Thus, all stress concentrators from the upper zone are eliminated and minimized, that is, to unity. Closed cavities, on the other hand, provide an increase in the moment of inertia of torsion by a factor of hundreds in comparison with a sheet belt of a traditional I-beam.

 The joints of the three-headed rail are displaced along with the walls of the crane beams by half a span (1/2), the ends of the rails and the ends of the beams are milled, which ensures the transmission of compressive forces with tight contact, and the split crane run is turned into continuous when mounted.

 When assembling a metal crane structure, it is rational to push the three-headed rail 1 longitudinally from the end onto the crane beam 3 until the oval holes are aligned (the oval is oriented along) in the sole of the rail and in the tray-shaped overlays.

 After combining the holes, frictional joints 5 are installed [2]. The supporting ribs are made in the same way as the prototype.

 The three-headed rail covers the upper belt of the crane beam with the lateral heads protruding downward and is clearly fixed on the crane beam without eccentricity.

 The crane design works as follows.

 The vertical force from the wheel of the crane P acts on the central head of the rail 1 without eccentricity and then on the upper end of the element a cross-shaped profile.

 In this element, stresses occur only with central compression. The length of the distribution of local stresses depends on the moment of inertia of the rail and the cross-shaped profile on bending. The stress value is small, since the moment of inertia of the torsion of the upper part of the beam together with the rail is large, and there is no stress concentration.

The horizontal action of the crane wheel T is transmitted to the right or left head of the rail without eccentricity. Torque (M _cr = T • h _p = 0) is absent.

The bend in the horizontal plane perceives the sole of the rail 1 with the chapters along the edges, working in conjunction with the cross-shaped profile of the beam. Additionally installed brake beam 4 perceives the horizontal impact T. Local torsion of the upper belt is absent (M _cr = 0).

 The developed design should be used in the reconstruction of crane tracks.

 Replacing a conventional crane rail with a three-headed and the upper part of the beam with a cross-shaped profile provides a sharp decrease in local stresses and a corresponding increase in durability, as well as an increase in the bearing capacity of a restored crane beam by two or more times, since the metal of a three-headed rail and a cross-shaped profile works as part of the section of the crane beam and therefore, bending stresses are sharply reduced.

 The most effective method of mounting a three-headed rail on a crane beam by sliding from the end of the beam by translational movement along the crane ways in the manner described in A.S. 358248, a.s. 1146353 [3, 4].

Literature
1. Nezhdanov K. K., Nezhdanov A.K. Metal crane construction of the Nezhdanovs. Patent of Russia 1791340. M.kl. At 66 C 6/00. Valid from 08/11/1993.

 2. Nezhdanov K.K., Vasiliev A.V., Kalmykov V.A., Nezhdanov A.K. Method and device for fixed connection. Patent of Russia 2114328. Bull. 18, reg. 06/27/1998.

 3. Nezhdanov K.K. etc. A method for replacing a crane rail. A.S. 358248, M. cl. B 66 C 7/08. Bull. 33 - 1972.

 4. Nezhdanov K.K. et al. A method for replacing a rail track. A.S. 1146353, M. cl. E 01 B 29/16, Bull. 11 - 1985.

Claims (1)

 A rail and beam structure comprising a crane beam, a three-headed rail and a brake beam provided with a channel profile in the zone of connection with the crane beam, characterized in that the upper part of the crane beam is made of a rolled cross-shaped profile containing a vertical element intersecting at right angles with a horizontal tray-like element, equipped with left and right horizontal sections connected to a three-headed rail by hollow rivets with embedded cores in a single unit, the upper torus the vertical element is in contact with the sole of the three-headed rail, the lower end is connected to the wall of the beam having a flanged upper edge forming a longitudinal rib, while the channel profile is placed between the corresponding horizontal section of the tray-like element and the longitudinal rib, which are connected with the brake beam in a single unit hollow rivets with embedded cores.

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