SU637252A1

SU637252A1 - Concrete mix compacting method

Info

Publication number: SU637252A1
Application number: SU752163805A
Authority: SU
Inventors: Юрий Григорьевич Граник; Владимир Яковлевич Фомичев; Александр Натанович Спивак
Priority date: 1975-08-08
Filing date: 1975-08-08
Publication date: 1978-12-15

Description

Изобретение относитс к области производства сборного бетона и железобе тона.This invention relates to the field of precast concrete production and iron tone.

Известен способ уплотнени бетонной смеси, включающий оановременное воздействие на смесь вибрировани и ударов fij , Этот способ не позвол ет эффективно уплотн ть малопоавижные и жесткие смеси, так как характеристики вибрации и удара (частота и амплитуда) завис т друг от друга, поскольку вибрацию и удары подают на бетонную смесь от одного органа.A known method of compacting a concrete mix, which includes a simultaneous effect on the mixture of vibrations and impacts fij. This method does not effectively compact low-impact and hard mixtures, since the characteristics of vibration and impact (frequency and amplitude) depend on each other, because the vibration and impacts served on a concrete mix from one body.

Наиболее близким к предлагаемому в л етс способ уплотнени бетонной смеси включающий одновременное воздействие на нее вертикальной вибрации и вертикальных ударов 2 .Closest to the proposed method of compacting a concrete mix, including simultaneous exposure to vertical vibration and vertical shock 2.

Частота и амплитуда ударов завис т от частоты и амплитуды вибрации, так как удары создаютс в результате периодического резонансного возрастани амплитуды вибрировани . При такой взаимосв зи частот и амплитуд не удаетс получить достаточно больших амплитуд ударов при необходимой высокой частоте вибрировани . Поэтому либо не происходит полного разжижени бетонной смеси, либо бетонна смесь недоуплотн етс . Это вынуждает примен ть пластичные бетонные смеси с высоким содержанием цемента либо повышать потребл емую мощность оборудовани .The frequency and amplitude of the impacts depend on the frequency and amplitude of the vibration, since the impacts are created as a result of a periodic resonant increase in the amplitude of the vibration. With this interrelation of frequencies and amplitudes, it is not possible to obtain sufficiently large amplitudes of shocks at the required high frequency of vibrations. Therefore, either the concrete mixture does not completely liquefy, or the concrete mixture is not compacted. This makes it necessary to use plastic concrete mixtures with a high cement content or to increase the consumed power of the equipment.

Цель изобретени - уменьшение по требл емой мощности оборудовани .The purpose of the invention is to reduce the power requirement of the equipment.

Достигаетс это тем, что воздействие вертикальной вибрации и вертикальных ударов осуществл ют соответственно с частотой 28ОО-6ООО кол/мин и 200-45О уд/мин и амплитудой 0,О50 ,12 и 4-12 мм.This is achieved by the fact that the impact of vertical vibration and vertical shocks is carried out, respectively, with a frequency of 28OO-6OOO col / min and 200-45 O beats / min and an amplitude of 0, 50, 12 and 4-12 mm.

Claims

Example 1. The product was made of a concrete mix stiffness 9O with. The mixture was subjected to simultaneous vibrations and impacts, respectively, with a frequency of 2800 count / min and 45O beats / min and an amplitude of 0.12 and 4 mm. The mass of the mold with the product was 4 tons, the specific power consumption was 1 kW / ton. The vibro shock treatment of the concrete mixture lasted 6 minutes. About 3 kWh were consumed for molding. Electricity costs compared to the prototype were reduced by 26%. Example 2. A similar product was made of the same concrete mixture with the following parameters of vibration and shock, respectively: frequency 6OOO Number / min and 2OO beats / min, amplitude 0.05 and 12 mm. In the case of an atom, the specific power consumed was O, 85 kW / t. The vibratory impact treatment of the concrete mixture lasted 6 minutes. The total cost of molding the product was 0.25, which is 30% lower than in the prototype. Thus, the economic efficiency of the proposed method consists in the possibility of reducing the cost of electricity for molding products by 25% -30%. Claim method for compacting concrete mix, including simultaneous exposure of vertical vibration and vertical shocks to it, characterized in that, in order to reduce equipment power consumption, vertical vibration and vertical shocks are applied at a frequency of 28OO-6OOO and 200450, respectively. beats / min and amplitude 0.05-0.12 and 4-12 mm. Sources of information taken into account in the examination: 1. Shigalsky V.I. Forming products on vibroplatforms. M., Straw & Yadat, 1968, p. 57.

2. USSR author's certificate 114102, cl. B 28 B 1/08, 1055. No.