SU963858A1

SU963858A1 - Method of producing articles of cellular concrete

Info

Publication number: SU963858A1
Application number: SU802980511A
Authority: SU
Inventors: Алексей Николаевич Чернов
Original assignee: Уральский Научно-Исследовательский Проектный Институт Строительных Материалов
Priority date: 1980-09-05
Filing date: 1980-09-05
Publication date: 1982-10-07

Description

Изобретение относится к промышленности строительных материалов и может быть использовано при изготовлении изделий из ячеистого бетона переменной плотности, получаемого путем прокатки частично отвердевшей ячеистобе- ⁵тонной смеси, на заводах ячеистого бетона.The invention relates to the building materials industry and can be used in the manufacture of products from aerated concrete with a variable density, obtained by rolling a partially hardened cellular concrete mixture of ⁵ tons, in aerated concrete plants.

Известен способ изготовления изделий из ячеистого бетона путем заливки₁₀ячеистобетонной смеси в форму, выдержки ее, уплотнения поверхностного слоя рабочим органом с криволинейной поверхностью, с последующей термообработкой отформованного изделия ,5A known method of manufacturing products from aerated concrete by pouring ₁₀ aerated concrete mixture into a mold, holding it, compacting the surface layer with a working body with a curved surface, followed by heat treatment of the molded product, 5

Недостатком известного способа является то, что при прокатке равнодействующая сжимающих напряжений в прокатываемой смеси направлена под у!глом к вертикали, вследствие чего часто го наблюдается сдвиг смеси и появление на поверхности изделия трещин, параллельных оси прокатывающего вала. Кроме того, известным способом трудно получить уплотняющий слой достаточ- ·· ной толщины, поскольку сжимающие напряжения валов быстро убывают с глубиной.A disadvantage of the known method is that during rolling the resultant compressive stresses in the rolled mixture are directed at an angle to the vertical, as a result of which the mixture is often shifted and cracks appear on the surface of the product parallel to the axis of the rolling shaft. In addition, it is difficult to obtain a sealing layer of sufficient thickness in a known manner, since the compressive stresses of the shafts quickly decrease with depth.

Цель изобретения - повышение качества за счет устранения трещин на поверхности изделия.The purpose of the invention is to improve quality by eliminating cracks on the surface of the product.

Поставленная цель достигается тем, что в способе изготовления изделий из ячеистого бетона путем заливки ячеистобетонной смеси в форму, выдержки ее, уплотнения поверхностного слоя рабочим органом с криволинейной поверхностью, с последующей термообработкой отформованного изделия, уплотнение поверхностного слоя осуществляют с помощью изогнутой металлической прокладки, радиус кривизны которой в 10-100 раз превышает радиус кривизны рабочего органа.This goal is achieved by the fact that in the method of manufacturing products from aerated concrete by pouring aerated concrete mixture into a mold, holding it, compacting the surface layer with a working body with a curved surface, followed by heat treatment of the molded product, sealing the surface layer is carried out using a curved metal strip, the radius of curvature which is 10-100 times greater than the radius of curvature of the working body.

Способ осуществляют следующим образом.The method is as follows.

В форму заливают ячеистобетонную смесь и выдерживают ее, после частич3 .963858 ного отвердевания)горбушку толщиной 2-4 см сминают путем укладки на поверхность изделия выпуклой стороной изогнутого листа с радиусом кривизны, превышающим радиус кривизны рабочего ₅вала в 10-100 раз, и прокатывания по вогнутой стороне листа рабочего вала, при этом ось вала параллельна образующей изогнутого листа. После уплотнения поверхностного слоя прокладку ю снимают и изделие подвергают термообработке.The cellular concrete mixture is poured into the mold and kept (after partial hardening of 3.963858)) a 2-4 cm thick crease is crushed by laying on the surface of the product with the convex side of a curved sheet with a radius of curvature 10-100 times greater than the radius of curvature of the working shaft ₅ and rolling on the concave side of the sheet of the working shaft, while the axis of the shaft is parallel to the generatrix of the curved sheet. After compaction of the surface layer, the gasket is removed and the product is subjected to heat treatment.

I П р и м е р. В форму размером 3,9^х * 1,2x0,25 м заливают газобетонную смесь с таким расчетом, чтобы образо- 15 валась горбушка высотой 3 см, выдерживают смесь до схватывания, затем на горбушку укладывают металлический лист толщиной 20 мм, длиной 3,2 м,шириной 1,4 м, имеющий положительную _2Qкривизну (т. е. вогнутость листа направлена вверх) с радиусом 5 м, при этом образующая цилиндрической поверхности листа параллельна его короткому торцу, а центральные нормали лис- ₂5 та и формы совпадают. К форме подают самоходную машину для прокатки ячеистого бетона, с прокатывающим валом длиной 2 м и диаметром 0,38 м. Прокатывающий вал ставят над коротким торцом листа, параллельно ему, и опускают, прижимая конец листа к бортам формы. При этом противоположный конец изогнутого листа поднимается над бортами формы на 0,8 м. После этого машину начинают перемещать к противоположному торцу формы. Во время движения вал машины последовательно прокатывается по вогнутой стороне листа, а внешняя (выпуклая) сторона листа уплотняет ячеистый бетон. После окончания прокатки лист снимают и переносят на следующую форму.I PRI me R. Aerated concrete mixture is poured into a mold with a size of 3.9 ^x 1.2 x 0.25 m in such a way that a hump of 3 cm is formed 15, the mixture is held until set, then a metal sheet with a thickness of 20 mm, 3.2 in length is laid on the hump m, width 1.4 m, having a positive curvature _2Q (m. e. sheet concavity directed upward) with a radius of 5 meters, thus forming the cylindrical surface of the sheet is parallel to its short end, a central normal lis- _{May 2} and that forms the same. A self-propelled machine for rolling cellular concrete is fed to the mold, with a rolling shaft 2 m long and 0.38 m in diameter. The rolling shaft is placed over the short end of the sheet, parallel to it, and lowered, pressing the end of the sheet to the sides of the form. In this case, the opposite end of the curved sheet rises above the sides of the mold by 0.8 m. After this, the machine begins to be moved to the opposite end of the mold. During movement, the machine shaft is successively rolled along the concave side of the sheet, and the outer (convex) side of the sheet compacts the cellular concrete. After rolling, the sheet is removed and transferred to the next form.

Предлагаемый способ позволит повысить качество поверхности изделий, а именно ликвидировать поперечные трещины.The proposed method will improve the surface quality of products, namely to eliminate transverse cracks.

Claims

The invention relates to the building materials industry and can be used in the manufacture of products from cellular concrete of varying density, obtained by rolling a partially hardened cellular concrete mixture, in cellular concrete plants. A known method of manufacturing products from cellular concrete by pouring the concrete mixture into a mold, holding it, compacting the surface layer with a working body with a curvilinear surface, followed by heat treatment of the molded product 1 J. The disadvantage of the known method is that during rolling the resultant compressive stresses in the rolled the mixture is directed below the vertical, as a result of which the mixture is often shifted and cracks appear on the surface of the product, which are parallel to the axis of the rolling shaft. Furthermore, it is difficult in a known manner to obtain a sealing layer of sufficient thickness, since the compressive stresses of the shafts rapidly decrease with depth. The purpose of the invention is to improve the quality by eliminating cracks on the surface of the product. The goal is achieved by the fact that in the method of manufacturing products from cellular concrete by pouring cellular concrete mixture into a mold, holding it, compacting the surface layer with a working body with a curvilinear surface, followed by heat treatment of the molded product, sealing the surface layer with a curved metal strip, radius whose curvature in JO-100 times the radius of curvature of the working body. The method is carried out as follows. The concrete mix is poured into the mold and kept there, after partial. 3-963 hardening, a 2-k cm thick crust is crushed by placing the convex side of a curved sheet with a radius of curvature 10-100 times the radius of curvature of the working shaft 10-100 times on the product surface and rolling along the concave side of the working shaft sheet, while forming a curved sheet. After compaction of the surface layer, the gasket is removed and the product is subjected to heat treatment. I PRI me R. A concrete mixture is poured into a mold of size W. 1.2 kO, 25 m, so that a crust of 3 cm high is formed, the mixture is held until it is set, then a metal sheet 20 mm thick, 3.2 m long, 1 m wide, is placed on the crust. has a positive curvature (i.e., the concavity of the sheet is directed upwards) with a radius of 5 m, wherein the forming cylindrical surface of the sheet is parallel to its short end, and the central normals of the sheet and the shape coincide. A self-propelled machine for rolling cellular concrete, with a rolling shaft 2 m long and 0.38 m in diameter, is fed to the mold. The rolling shaft is placed above the short end of the sheet, parallel to it, and lowered, pressing the end of the sheet to the sides of the mold. At the same time, the opposite end of the curved sheet rises 0.8 m above the bead of the form. After that, the machine begins to be moved to the opposite end of the form. During the movement, the shaft of the machine is successively rolled on the concave side of the sheet, and the outer (convex) side of the sheet compacts the cellular concrete. After rolling is completed, the sheet is removed and transferred to the next mold. The proposed method will improve the quality of the surface of products, namely to eliminate transverse cracks. The invention method of manufacturing products from cellular concrete by pouring cellular concrete mixture into a mold, holding it, sealing the surface layer with a working body with a curved surface followed by heat treatment of the molded product, characterized in that, in order to improve the quality by eliminating cracks on the surface of the product, sealing the surface layer is carried out using a curved metal strip, the radius of curvature of which is 10-100 times greater than the radius of curvature of the working member. Sources of information taken into account during the examination 1. USSR Author's Certificate No., cl. B.28 B 1/50. I960 (prototype).