RU2148131C1 - Method for manufacture of lightweight metal structures - Google Patents

Abstract

FIELD: construction engineering. SUBSTANCE: lightweight metal structure manufactured according to method can be used as load-bearing component in framework of building and also in crane runway supports. In compliance with method, primary component of structure is divided into two half-girders with rectangular protrusions. Height of protrusion relates to its length as

Description

 The invention relates to construction and can be used in the manufacture of supporting metal structures.

A beam with a perforated wall is known (SU 1770533, 10.23.92), in which the initial beam is dissolved along a sawtooth line with an angle of 90 ^o between the sides of the teeth with the subsequent connection of the tops of the teeth using segments of isosceles corners. The disadvantage of this method is a small increase in the height of the cross section of the beam, i.e. insufficient increase in bearing capacity.

 A known method of manufacturing a lightweight metal beam (SU 1330280, 08/15/92), including the initial dissolution of the wall of the original beam, joining the received parts and re-dissolving the resulting beam element along a zigzag line inscribed in straight parallel to the belts of the obtained beam element, joining the received parts along protrusions and their connection, while the initial dissolution of the wall is carried out along a zigzag line inscribed in two parallel lines of the original blank of the line, and the coupling of the resulting The holes are seized at the corners of the holes obtained, and the re-dissolution line sequentially bends around the holes formed by perforation, while the half-wave length of the row line is equal to the distance between the centers of the holes of the primary perforation.

 The disadvantages of this design are the impossibility of arbitrary application of the load to the belts of the formed beam, as well as its flexibility in the sections of the belts from the transverse forces and insufficient increase in the height of the cross section.

где h - высота,
b - длина выступа с последующей установкой вырезанных треугольников в прямоугольных отверстиях.The closest analogue of the claimed invention is a method of manufacturing a lightweight metal beam (SU 1738905, 06/07/92), including cutting the wall of the beam with the formation of rectangular protrusions with a ratio of the height of the protrusion to the length equal to 0.6-0.75, joining half beams, the subsequent cutting of rectangular triangles with the angle of inclination of the leg to the lower belt of the beam equal to

where h is the height
b - the length of the protrusion, followed by the installation of cut triangles in rectangular holes.

 The disadvantage of this design is a small increase in the height of the cross section, as well as the impossibility of arbitrary application of load to the lower belt, which makes it difficult to use, for example, in the construction of columns, as well as ways of overhead cranes.

 When creating the invention, the task was to increase the bearing capacity of the structure and unify its use.

(SU 1738905), где h_в - высота выступа,
b - длина выступа, то в нашем случае будем иметь:

Решив данное уравнение относительно (h_в/b), получим

После этого образованная балка распускается по пилообразной линии с углом 90^o между сторонами зубьев, причем стороны зубьев параллельны большим сторонам пятиугольников образованной балки. Образованные после повторного роспуска полубалки стыкуются вершинами зубьев с помощью отрезков разнобоких уголков. Высота полки соединительных уголков назначается из расчета восприятия сварными швами растягивающего усилия в кромке зуба от поперечной силы в сечении балки. Длина отрезков уголков назначается из условия восприятия растягивающего усилия двумя швами, соединяющими отрезки уголков друг с другом.The problem is solved as follows:
In the present invention, the initial dissolution of the initial beam is made in a zigzag line with rectangular protrusions with the subsequent joining of the formed half beams with the formation of rectangular holes, rectangular triangles are cut from the beam wall with a leg equal to 0.5 b, where b is the length of the protrusion and the angle of the leg of the leg to the belt beam equal to 45 ^o . In this case, the cutting of pairs of right-angled triangles is staggered from the lower and upper zones, followed by the insertion of the cut triangles into the right angles of the holes. Since the sine of the angle of inclination of the leg to the waist of the beam should be equal

(SU 1738905), where h _in - the height of the protrusion,
b is the length of the protrusion, then in our case we will have:

Having solved this equation with respect to (h _in / b), we obtain

After that, the formed beam opens in a sawtooth line with an angle of 90 ^o between the sides of the teeth, and the sides of the teeth are parallel to the large sides of the pentagons of the formed beam. The half beams formed after repeated dissolution are joined by the tops of the teeth using segments of different angles. The height of the flanges of the connecting corners is determined based on the perception by the welds of the tensile force in the tooth edge from the transverse force in the beam section. The length of the corners is assigned from the condition of perception of the tensile force by two seams connecting the corners to each other.

The maximum value of the height of the protrusion h _{in the} initial dissolution should not exceed 0.35 h _b , where h _b is the height of the cross section of the original element, due to the fact that with a larger value of h _in when re-dissolving we get a small section height of the belts of the proposed design. The minimum value of h _in should not be less than 0.25 h _b , because at a lower value, a sufficient effect of the method is not achieved. As a result, the cross-sectional height of the formed structure is from 2.51 h _b to 2.08 h _b , where h _b is the cross-sectional height of the original element.

на фиг. 2 - стыковка образованных полубалок путем смещения на величину b с соединением по выступам и креплением вставок 3 и 4; на фиг. 3 - вырезка прямоугольных треугольников 5 из стенки под углом 45^o к поясам балки; на фиг. 4 - вставка вырезанных прямоугольных треугольников 5 в прямые углы отверстий балки и роспуск образованной балки по пилообразной линии, параллельной большим сторонам пятиугольных отверстий на две полубалки 6 и 7, при этом вершины пилообразной линии закругляются по r = 10 мм; на фиг. 5 - образованная конструкция после соединения балок 6 и 7 с помощью отрезков равнобоких уголков 8 и вставки 9, "а" - высота сечения поясов образованной конструкции; на фиг. 6 - узел "А" на фиг. 5, где Q - поперечная сила в сечении конструкции; на фиг. 7 - сечение 1-1 на фиг. 6, где Q - поперечная сила в сечении конструкции; h_ш1 - высота шва, прикрепляющего соединительный уголок 8 к кромке зуба, l_ш1 - его длина, h_ш2 - высота шва, соединяющего соединительные уголки 8 между собой; l_ш2 - его длина.The invention is illustrated by drawings, where in FIG. 1 shows the initial dissolution of the starting element to the upper and lower 2 half beams, while h _in - the height of the protrusion is 0.25 - 0.35 h _b , the length of the protrusion b is

in FIG. 2 - docking of the formed half beams by shifting by a value of b with connection along the protrusions and fastening of the inserts 3 and 4; in FIG. 3 - cutting rectangular triangles 5 from the wall at an angle of 45 ^o to the belts of the beam; in FIG. 4 - insertion of cut rectangular triangles 5 into the right angles of the beam openings and dissolution of the formed beam along a sawtooth line parallel to the large sides of the pentagonal holes into two half beams 6 and 7, while the vertices of the sawtooth line are rounded at r = 10 mm; in FIG. 5 - formed structure after joining beams 6 and 7 using segments of isosceles corners 8 and insert 9, "a" is the height of the section of the belts of the formed structure; in FIG. 6 - node "A" in FIG. 5, where Q is the transverse force in the cross section of the structure; in FIG. 7 is a section 1-1 in FIG. 6, where Q is the transverse force in the cross section of the structure; h _w1 - the height of the seam attaching the connecting corner 8 to the edge of the tooth, l _w1 - its length, h _sh2 - the height of the seam connecting the connecting corners 8 to each other; l _W2 - its length.

 The construction made by this method is a system of triangular plates with pentagonal holes connected to each other in the zones of the belts directly with each other, in the central part - using segments of isosceles corners, at the ends of the plate are attached to rigid end elements. The connection by segments of the isosceles corners gives the wall sections additional rigidity.

Claims (1)

A method of manufacturing lightweight metal structures, including the dissolution of the source element in a zigzag line with the formation of rectangular protrusions, joining the formed half-beams along the protrusions, cutting out pairs of rectangular triangles from the beam wall with their subsequent insertion into right angles of holes, characterized in that after the insertion of rectangular triangles the structure is dissolved along a sawtooth line with a right angle between the sides of the teeth, the formed half beams are joined with the help of isosceles corners, and the ratio of the height of the protrusion during the initial dissolution to the height of the cross section of the original element is 0.25-0.35, while

where h _in - the height of the protrusion during the initial dissolution;
b is its length,
the angle of the legs of the right triangles is 45 ^o C, and the cutting and pasting of pairs of right triangles is staggered from the lower and upper zones of the wall of the structure obtained after the initial docking.

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