RU2404496C2 - Metal cable tray of staircase type for wiring works - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: tray consists of two side L-shaped section bars and transverse section bars - crosspieces and provides for connection of board with crosspiece by arrangement of a joint as a result of deformation of board plane and crosspiece lugs plane in the form of rivet (clinch technology). Lower edge of board has additional horizontal flanging, upper edge of tray has rounding provided for application of snap cover. Board and crosspiece have perforation, on board in the form of oval openings, on crosspiece in the form of rectangular holes. Connection of stair trays is done with an overlap by coupling of end part of staircase tray with expanded end part of connected stair tray. Butt joint is possible with application of horizontal connectors. Fixation of trays to walls and ceilings is done with the help of assembly plates and cantilevers.

EFFECT: increased stability of structure and reliability when loading with significant distributed and concentrated loads, increased corrosion resistance of item, reduced number of connection and support parts required for assembly, simplified installation.

5 cl, 7 dwg

Description

The invention relates to electrical engineering and is used to assemble structures intended for laying cables and insulated wires in internal energy routes. The route consists of a set of structural elements connected to each other and forming a thread laid on a certain segment. Trails assembled using staircases can be used in industrial, energy and civil engineering.

Known cable trays of the ladder type, consisting of bearing longitudinal rods connected to the jumpers by bolts by means of flanges available on the bearing rods.

The rigidity of the mounting of this design makes it heavier and is not convenient when transporting to the installation site (WO 0131758, CL H2G 3/04, 2001).

Cable ladder-type constructions are known in which the side rods and crossbars are perforated and connected to each other by means of perforation holes with bolts with the possibility of their movement in this hole, which is elongated longitudinally (DE 20014393, CL H2G 3/04, 2001).

This design, providing mobility of the connection of its elements, is not reliable in stability when heavy cables are placed on it.

Known ladder-type trays for power lines, containing two unclosed polyhedral spars connected by crossbars, the ends of which are fixed inside the spar cavities, while the spars faces facing the inside of the tray are perpendicular to the crossbars or form an acute angle with them from the outside (RU 24806, C. H2O 3/04, 2002).

This design does not have sufficient rigidity when loading heavy power cables on it.

Cable-carrying ladders of the ladder type are known, which are an open structure consisting of two side walls with transverse connecting strips, the side walls of the structure are made of a hollow faceted longitudinally elongated profile with a cross section: a) in the form of a regular hexagon elongated in one direction, with flat faces; b) in the form of a regular hexagon, elongated in one direction, the side of which, facing the inside of the tray, has corrugations; c) in the form of a regular hexagon torn on one side, with the ends bent inward at the place of the gap.

The connecting strips are made oval, flat, perforated and connected to the sidewalls by entering the sidewalls inside into the expansion from the outside or welded at the contact point with corrugated surfaces (RU 49383, class Н02G 3/04, 2005).

The drawback of these trays is the use of welding, as well as a closed profile in which condensation can form, which, when the ambient temperature changes, leads to metal corrosion.

Closest to the invention are the ladder type trays of Vergokan company, which are used for laying heavy cables of large cross section. There are three types of trays: KL spars from a perforated L-shaped profile with C-shaped crossbeams. KS spars from rectangular pipes with perforated crossbars of the C-shaped section, KLI spars from rectangular pipes with round crossbars.

The disadvantage of these trays is the relatively low bearing capacity and the complexity of the assembly structure, requiring the use of a large number of connecting and supporting corresponding elements for the strong fastening of its components during installation.

The task to which the present invention is directed is to increase the stability (rigidity) of the structure and reliability when loading with significant distributed and concentrated loads, increase the corrosion resistance of the product, reduce the number of connecting and supporting parts required for assembly; simplification of installation, as well as, as a consequence of the above reasons, the high economic efficiency of the application.

To achieve the specified technical result, the tray provides for connecting the bead with the crossbeam by forming a connection due to deformation of the bead plane and the plane of the cross-bar antenna in the form of a rivet (clinch technology). Such fastening, being at a low cost in comparison with the presented options for trays, provides:

1) the necessary rigidity, because excludes additional elements (for example, rivets, bolts, etc.);

2) makes it possible to produce a tray without additional hot-dip galvanizing — from a finished sheet, galvanized by the Sendzimir method, with a minimum violation of the zinc coating, which increases the corrosion resistance of the product;

3) reduction of manufacturing costs and attractive appearance due to the lack of additional galvanizing.

The lower edge of the bead has an additional horizontal flanging, which increases the rigidity of the bead and carries an additional supporting function for the crossbar under longitudinal load, which increases the bending stability of the structure. Also, a flanging with an inward-curved edge protects against a sharp edge, which worsens the conditions for assembly and installation of trays.

The upper edge of the tray has a rounding provided for the use of a snap-on lid, which has the function of protecting against the ingress of foreign objects (dirt, etc.) into the structure.

The side and the crossbar have perforations, on the side - in the form of oval holes, on the crossbar - in the form of rectangular holes. The holes on the sides are designed to connect the trays, the holes on the crossbar are designed to attach the cable to the tray.

The L-shaped side profile with holes and openings on the crossbeams perform an additional function - natural cooling of the cable and ventilation of the structure to prevent moisture accumulation, which also increases the corrosion resistance of the structure.

The connection of the ladder trays is overlapped by combining the end part of the ladder tray with the expanded end part of the ladder tray to be connected (father-mother connection diagram), which increases the structural strength and eliminates the use of additional elements. Also, the design provides for the possibility of butt joint using horizontal connectors.

The invention is illustrated by drawings:

- figure 1 is a General view of the staircase;

- figure 2 is a view of the fastening method of clinch technology;

- figure 3 is a view of the tray with a lid;

- figure 4 is a view of the connection of the lap trays;

- figure 5 is a view of the reinforced connection of the lap trays;

- figure 6 is a view of the connection of the trays butt;

- Fig.7 is a view of a tray with a separator.

The ladder tray includes two lateral L-shaped profiles 1, which are rigidly connected to each other by transverse profiles - rungs 2, arranged with an even pitch 3. The side geometry and thickness of the metal from which the ladder tray is made determines the rigidity of the tray. The height of the side 4 and width 5 determine the area of the useful section of the tray, which is designed to fill the cable. The length of the tray 6 is selected from the technological feasibility of production and ease of installation. Crossbars and sides are made perforated. If necessary, a snap-on lid is installed on the tray 7. To connect the overlapping trays, the end part of the ladder tray 8 is combined with the expanded end part of the attached ladder tray 9 (father-mother connection diagram). The connection can be strengthened using a horizontal connector 10. When connecting the trays end-to-end, which is used if it is necessary to connect the trays shorter than the standard length, the end parts of the two trays 11 and 12 are connected using a horizontal connector 13. To separate the cable lines in the tray, a separator 14 is used.

The entire combination of the above features and the technical result are aimed at solving the problem.

The trays are made of steel, galvanized by the Sendzimir method.

Trays are attached to walls and ceilings using mounting plates and consoles.

Claims (5)

1. A cable ladder metal cable tray for electrical work, containing two lateral L-shaped profiles that are rigidly interconnected by transverse cross-profiles, characterized in that the connection of the side with the crossbar is carried out by forming a connection due to deformation of the side plane and the plane of the cross-arms in the form of a rivet, the lower edge of the bead has an additional horizontal flanging, the upper edge of the tray has a rounding for the use of a snap-on lid, and the side and the crossbar has perforation, on the side in the form of oval holes, on the crossbar in the form of rectangular holes, and one of the end parts of the tray is made expanded. 2. The tray according to claim 1, characterized in that a separator is used to separate the cable lines in the tray. 3. A system for laying energy trails, containing at least two trays according to claim 1 or 2, characterized in that the connection of the ladder trays is overlapped by combining the end part of the ladder tray with the expanded end part of the joining ladder tray. 4. The system according to claim 3, characterized in that the connection is reinforced with a horizontal connector. 5. A system for laying energy trails, comprising at least two trays according to claim 1 or 2, characterized in that the connection of the ladder trays is end-to-end using a horizontal connector.

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