RU30294U1 - Corrugated Element - Google Patents

Description

Corrugated Element

The utility model relates to the field of sheet material processing by pressure, namely, to the production of cold-formed special-purpose rolled sections and can be used for the manufacture of prefabricated metal corrugated structures intended for the construction of pedestrian tunnels, overpasses, drains, culverts under embankments of railways and roads .

Currently, metal corrugated structures are used, the cross sections of which have various shapes, namely:

round

arched (semicircular),

elliptical

arched lowered

arched increased height.

Corrugated metal structures of all types consist of separate elements - corrugated sheets, which must be bent along a given radius and combined into a spatial structure using bolted joints. Corrugated metal products are manufactured on roll forming units by the method of continuous cold profiling of billets (steel strips, strips or sheets) and are called - bent rolled profiles.

IPC 7 V 21D 13/04

B21D 5/06 V 21 D 7/08

the broad capabilities of the profiling process and its high technical and economic indicators;

a large range of technological advantages, namely: high surface quality, the same thickness over the entire cross-section of the profile, the ability to produce profiles of complex configuration, which allows you to get parts that do not require further processing, etc.

high economic efficiency of their use in most sectors of the economy.

Bent profiles of hire can have the most various configuration of cross section. The domestic industry produces general purpose and special profiles, that is, designed for specific, strictly defined structures. The corrugated element claimed in this utility model is a special purpose corrugated bent profile.

Known corrugated plate 1 for a heat exchanger with local deformed areas on the tops and troughs of the corrugations. To increase the efficiency of the heat exchanger, the deformed sections are made in the form of transverse grooves with counter-curved edges. Known plate 1, having a profile of the form described above, is intended for a specific structure and cannot be used for the manufacture of prefabricated metal corrugated structures intended for tunnels, overpasses, etc.

Also known corrugated bent profile 2 for special purposes, used in particular for the lining of passenger railway cars. Corrugated bent profile 2 is made of corrosion-resistant and structural carbon steels and contains corrugations of various widths and heights, having specific ratios of their geometric parameters, providing

necessary rigidity of a profile. However, as well as the well-known plate 1, the corrugated bent profile 2 cannot be used for the construction of tunnels, overpasses, etc.

The configuration and parameters of various corrugated bent profiles are also given in the literature 3. Some of them can be considered as analogues of the proposed utility model. Known corrugated profile 4, intended for special structures, having a constant pitch (348 mm) and a height of 172 mm Corrugated Nrofil is made of steel grade StZkp 4 mm thick. However, the known profile 4, which has a special purpose, cannot be used for the construction of tunnels, overpasses, etc.

The closest in its technical essence to the proposed utility model is a corrugated sheet profile 5, selected as a prototype. Corrugated profile 5 is intended for the construction of culverts and contains stiffness corrugations having constants: span (130 mm), height (35 mm) and corrugation radius (39 mm). However, the corrugated profile 5 is not optimal in design for use as a ready-made structural element for the manufacture of prefabricated metal corrugated structures intended for the construction of transport pedestrian tunnels, overpasses, drains, culverts under embankments of railways and roads. This is due to the following reasons. The maximum sheet thickness is only 2.5 mm, which cannot provide the necessary rigidity for metal corrugated structures, the construction of which requires corrugated profiles having a sheet thickness of up to 8 mm. In addition, as already indicated above, corrugated sheets.

Designed for the construction of metal corrugated structures of all types, they must be bent along a given radius, due to the shape of the future structure, and combined into a spatial structure using bolted joints. The absence of these structural features is a significant disadvantage of the prototype.

The objective of the utility model is to create a corrugated bent profile, the design and configuration of which is as close as possible to the cross-sectional shape of the metal corrugated structure for which this element is intended.

To achieve the task

corrugated element, which, like the one closest to it, selected as a prototype, is a rectangular corrugated bent profile made of sheet steel with thickness S. The profile contains corrugations having a constant pitch A. Constant height H and radius R. A feature of the proposed utility model that distinguishes it from the well-known accepted as a prototype of the corrugated element is that it is made curved at a predetermined radius corresponding to the radius of the cross section of the metal corrugation construction. The crests of the extreme corrugations of the corrugated element are located on its inner surface. The corrugated element is provided with perimeter holes. Holes located along the sides of the corrugated element parallel to the direction of the corrugations can be made in one row with a constant pitch. To facilitate assembly, these holes may have an oval shape elongated along the corrugation direction. Holes located along the sides of the corrugated element perpendicular to the direction of the corrugations can be made in one row with

at a constant step and are located one at a time on all ridges or all troughs of the corrugations. To increase the reliability of the assembly, the holes located along the sides of the corrugated element perpendicular to the direction of the corrugations can be made in two rows with a constant pitch and are staggered one at a time on all ridges or all hollows of the corrugations.

The tasks set during the creation of the utility model, was made possible thanks to the following.

The corrugated element proposed in this utility model is a finished part from which metal corrugated structures of various configurations can be assembled. This is due to the fact that the corrugated element is curved in radius, which is equal to the radius of the cross section of the metal corrugated structure for use in which this particular element is intended. In addition, the assembly of corrugated structures involves connecting the corrugated elements with an overlap using bolts. To do this, holes are provided in the corrugated element along the entire perimeter, which provide a tight, reliable connection of the corrugated elements to each other. The ovality of the shape of the holes located along the sides of the element parallel to the direction of the corrugations provided for in the third paragraph of the formula of the utility model facilitates the execution of transverse (circular) joints of the corrugated metal structure. The staggered arrangement of openings along the sides of the element perpendicular to the direction of the corrugations proposed in the fifth paragraph of the formula provides increased reliability of the longitudinal (along the construction axis) joints with large dimensions of the metal corrugated structure.

Thus, the combination of the above features allows us to solve the tasks.

The proposed utility model is illustrated by drawings, which show one of the specific examples of the implementation of the proposed corrugated element.

In FIG. 1 shows a corrugated element bent in accordance with a predetermined radius;

in FIG. 2 - blank corrugated element with holes located in accordance with n. 5 formulas of a utility model (top view);

in FIG. 3 is a side view of FIG. 1;

in FIG. 4 - geometric characteristics of the corrugations (place I in Fig. 3). The proposed corrugated element 1 is intended for the manufacture of prefabricated metal corrugated structures, namely, overpasses with an inner radius of 5.4 m (see Fig. 1). For the manufacture of this corrugated element 1, a blank 2 of a corrugated bent profile (see Fig. 2) is used, which has a rectangular shape. The ridges 3 and 4 (see Fig. 3) are located on the inner surface of the corrugated element. For assembling and connecting together the corrugated elements in the structure for use in which this corrugated element is intended, holes for fastening elements are provided along the perimeter of the workpiece 2. Holes 5 located along the sides of the workpiece 2 parallel to the direction of the corrugations are made in one row with the easiest step. To facilitate the hole 5 have an oval shape, elongated along the direction of the corrugation. The hole sizes are 5 - 30x24 mm, and their maximum deviations are ± 0.5 mm. On the transverse edges of the workpiece 2 along its sides,

deviations from the diameter (+0.5; - 0.2) mm. Deviations of holes 6 by ovality should not exceed 0.5 mm. Holes 6 are made in two rows with a constant pitch (164 ± 0.7) and are staggered one at a time on all ridges of the corrugations. Limit deviations of hole positions:

between adjacent holes in a row of ± 1 mm;

between adjacent rows of holes with a distance between them of up to 2.5 m; ± 1 mm.

The profile of the corrugated element 1 shown in FIG. 4. The corrugated element 1 is made with round corrugations, the geometric parameters of which are presented in FIG. 4. In FIG. 4 the following designations are introduced;

A - corrugation pitch, equal to (164 ± 2) mm;

N - corrugation height, equal to (57 ± 3) mm; R is the radius of the corrugation, equal to (38 ± 1) mm;

In - the length of the direct insert is 1.99 cm;

and - the angle of visibility of the circular part is 116.86 °;

S - the thickness of the blank sheet is 8 mm.

The described configuration of the corrugated element, as confirmed by tests performed at the manufacturer, ensures the manufacturability of cold rolling (corrugation) of the sheet in the factory, tight lap jointing and sufficient sheet stiffness, which guarantees the required strength and stability of the flexible pipe structure, which is in operation during elastic medium.

The steel grade for corrugated elements is selected depending on the purpose and design loads on the metal corrugated structure, as well as the climatic conditions of its application. Usually.

use steel grade 15SP or 09G2D GOST 1050-88.

To protect the corrugated elements from corrosion, a zinc coating from the melt is used in accordance with the requirements of GOST 9.307-98 with a thickness of at least 85 microns. Depending on the aggressiveness of the atmosphere and soils in which the metal corrugated structure will be operated, additional methods of protecting the corrugated elements from corrosion are used. To do this, for example, a layer of a phosphating primer and a layer of paint and varnish are applied to the corrugated elements over a zinc coating.

The manufacture of the proposed corrugated element 1 is as follows. Designed for the manufacture of a corrugated element, the rolling flat material undergoes a sequential series of mechanical operations, the first of which is cutting into dimensional blanks. Cutting of blanks is carried out on guillotine-type shears, for example, mechanical guillotine shears N3121A, for example, can be used. Cut pieces are transferred to the next operation - profile bending, which is carried out on a hydraulic press, for example, a press of the NMP 30.250 brand. Each workpiece goes through eight bending cycles. During the work, special attention is paid to the parallelism of the corrugating profiles. The next operation is punching in the workpiece oval holes 5 and round holes 6. The operation is performed on a hydraulic press. After this operation, on a hydraulic bending press, for example, on an IG 1330V press, preliminary bending of the edges of the workpiece of the corrugated element 1 is carried out, after which the workpiece enters the final operation - bending along a given radius. This operation is performed on a 4-roll bending machine with programmed control of the PAS-420 brand. The blank is entered in

the gap between the upper and lower drive rollers and fits on the holding roller. The roll rotation drive is turned on and the workpiece is flexible. Corrugated element I is removed from the bending machine and transferred to the finish in the hot dip galvanizing workshop.

Thus, the proposed corrugated element due to the execution of curved along a predetermined radius is a part ready for the assembly of metal corrugated structures of various configurations.

USED SOURCES:

1.AVT.SVID. USSR 1796313, class In 21D 13/04, publ. 1993

2. RF patent 2070458, cl. In 21D 5/06, 13/04, publ. 1996 year

3. Bent profiles of hire. Directory. Edited by Trishevsky I.S., M .: Metallurgy. 1980, p. 202 - 236.

4. Bent profiles of hire. Directory. Edited by Trishevsky I.S., Moscow: Metallurgy, 1980, p. 218. Profile for special constructions 696x172x4 mm.

5. Bent profiles of hire. Directory. Edited by Trishevsky I.S., Moscow: Metallurgy, 1980, p. 229. Profile for culverts - prototype.

Claims (5)

1. A corrugated element, which is a corrugated bent profile of a rectangular shape made of sheet steel of thickness S, containing corrugations having a constant pitch A, constant height H and radius R, characterized in that it is made curved at a predetermined radius corresponding to the radius of the transverse sections of the metal corrugated structure, while the ridges of the outer corrugations are located on the inner surface of the corrugated element provided with holes along its perimeter. 2. The corrugated element according to claim 1, characterized in that the holes located along its sides parallel to the direction of the corrugations are made in one row with a constant pitch. 3. The corrugated element according to claim 2, characterized in that the holes have an oval shape elongated along the corrugation direction. 4. The corrugated element according to any one of claims 1 to 3, characterized in that the holes located along its sides perpendicular to the direction of the corrugations are made in one row with a constant pitch and are located one on all ridges or all hollows of the corrugations. 5. Corrugated element according to any one of claims 1 to 3, characterized in that the holes located along its sides perpendicular to the direction of the corrugations are made in two with a constant step and are staggered one by one on all crests or all hollows of the corrugations.