RU2009136725A

RU2009136725A - METHOD FOR INCREASING STRENGTH AND RIGIDITY OF CYLINDER PIPE WHEN ITS BEND

Info

Publication number: RU2009136725A
Application number: RU2009136725/02A
Authority: RU
Inventors: Кирилл Константинович Нежданов (RU); Кирилл Константинович Нежданов; Алексей Кириллович Нежданов (RU); Алексей Кириллович Нежданов; Александр Николаевич Жуков (RU); Александр Николаевич Жуков
Priority date: 2009-10-05
Filing date: 2009-10-05
Publication date: 2011-04-20
Also published as: RU2460603C2

Abstract

Способ повышения прочности и жесткости цилиндрической трубы при ее изгибе, заключающийся в том, что монтируют пару матриц с выпуклой параболической или эллиптической формой внешней поверхности, соединенных друг с другом через систему гидравлических домкратов, а гидравлические домкраты в свою очередь соединяют маслопроводами с насосной станцией и пультом управления, оснащенным манометрами, оснащают стенд системой электрических датчиков, контролирующих процесс деформирования цилиндрической трубы и отправляющих результаты измерения на пульт управления, по рольгангам вдвигают внутрь цилиндрической трубы с ее торца упомянутую пару матриц, соединенных системой гидродомкратов, с пульта оператор включает насосную станцию, повышает давление масла в системе гидравлических домкратов и раздвигает матрицы вверх и вниз до контакта их изнутри с внутренней поверхностью цилиндрической трубы, контролируя давление масла в системе гидравлических домкратов и внешние габариты цилиндрической трубы, раздает ее в холодном состоянии, разжимает, плющит ее изнутри и пластически необратимо деформирует ее гидравлическими домкратами в овальный профиль с относительной высотой n=2h/b, соответствующий его максимальному моменту сопротивления, определяемому из кубического уравнения , ! где h - высота арки от главной оси X профиля сечения до срединной линии; b - ширина арки по срединной линии; t - толщина стенки, раздаваемой валками трубы; А - площадь овального сечения; ! и главным моментом инерции !состоящего из двух взаимно зеркальных арок, соединенных друг с другом пятами, с образованием монолитного овального трубчатого профиля. A way to increase the strength and rigidity of a cylindrical pipe when it is bent, which consists in mounting a pair of matrices with a convex parabolic or elliptical shape of the outer surface, connected to each other through a system of hydraulic jacks, and the hydraulic jacks, in turn, are connected by oil pipelines to the pump station and the console the controls equipped with manometers equip the stand with a system of electric sensors that control the process of deformation of the cylindrical pipe and send the measurement results to the control panel, the aforementioned pair of matrices, connected by a hydraulic jack system, is pushed into the cylindrical pipe from its end by the roller tables, the operator switches on the pump station from the control panel, increases the oil pressure in the hydraulic jack system and pushes the matrices up and down until they come into contact with the inside of the cylindrical pipe controlling the oil pressure in the system of hydraulic jacks and the external dimensions of the cylindrical pipe, it distributes it in the cold state, unclenches, flattenes it from the inside and plastically imo it deforms its hydraulic jacks in the oval profile with relative height n = 2h / b, corresponding to its maximum resistance moment determined from cubic equations! where h is the height of the arch from the main axis X of the section profile to the midline; b is the width of the arch in the midline; t is the thickness of the wall distributed by the pipe rolls; A is the oval sectional area; ! and the main moment of inertia! consisting of two mutually mirrored arches joined together by heels, with the formation of a monolithic oval tubular profile.

Claims

A way to increase the strength and rigidity of a cylindrical pipe when it is bent, which consists in mounting a pair of matrices with a convex parabolic or elliptical shape of the outer surface, connected to each other through a system of hydraulic jacks, and the hydraulic jacks, in turn, are connected by oil pipelines to the pump station and the console control equipped with pressure gauges equip the stand with a system of electric sensors that monitor the process of deformation of the cylindrical pipe and send the measurement results to the control panel, the aforementioned pair of matrices, connected by a hydraulic jack system, is pushed into the cylindrical pipe from its end by the roller tables, the operator switches on the pump station from the control panel, increases the oil pressure in the hydraulic jack system and pushes the matrices up and down until they come into contact with the inside of the cylindrical pipe controlling the oil pressure in the system of hydraulic jacks and the external dimensions of the cylindrical pipe, it distributes it in the cold state, unclenches, flattenes it from the inside and plastically imo it deforms its hydraulic jacks in oval profile having a relative height n = 2h / b, corresponding to its maximum torque resistance, determined from the cubic equation

,

where h is the height of the arch from the main axis X of the section profile to the midline; b is the width of the arch in the midline; t is the thickness of the wall distributed by the pipe rolls; A is the oval sectional area;

and the moment of inertia

consisting of two mutually mirrored arches joined together by heels, with the formation of a monolithic oval tubular profile.