Reinforced Concrete

Construction joints are the least responsible construction sites in accordance with the requirements of building regulations. Columns should be the full height concrete floor without interruption, construction joints are held only at the very bottom of the column - at the top of the foundation or floor, or at the top of the column - below the junction of beams, slabs. In the columns with capitals business tripled in the bottom of the seam [...]

In the manufacture of precast concrete plants are used in the machine-vibration table and vibration tables, which are set filled with concrete forms. In periods of laying concrete, on the border between the previously packed and re-lay concrete form construction joints that are before laying the next layer is processed by blowing with compressed air, sandblasted and then rinsing with water. If you want high density, and [...]

External vibrators brand of I-87 (solenoid) are attached to the outside of the casing. The concrete is compacted by jarring the formwork. In view of the complexity of rearrangements and uneven compaction of concrete mix external vibrators are used is limited - only at small sizes and thicknesses of the structures.

Surface vibrator (vibration table and screeds) transmit vibrations through the ground or rail that is installed on the exposed surface of concrete. Surface vibrators consist of a vibrating rigid platform, which is located elektrovibrodvigatel with the imbalance. Performance ploschadochnyh screed vibrators and is 6-8 m \ h compacted concrete.

The internal (deep) vibrators brands I-21, I-22, I-50, I-86, I-103 and I-116 is immersed in a working condition directly in the concrete mixture, thereby vibrating the concrete is compacted. Removing the concrete vibrator is also produced when the motor is running. In the high-frequency internal vibrators I-22, I-50 motor with unbalanced mass is placed in a sealed enclosure, forming the bulk of the vibrator. Widespread use of vibrators found [...]

a - internal vibrators: 1 - c a flexible shaft, 2 - vibrobulava 3 - Batch vibrator, b - surface vibrators

To seal the concrete used electromechanical, electromagnetic and pneumatic vibrators. For concreting the monolithic structures is the most convenient electromechanical vibrator, consisting of an electric motor, the shaft is eccentrically nasazhany loads - eccentric (or imbalance). Unions do not allow the shaft to rotate smoothly, causing it to vibrate. Depending on the principle of the transfer of vibration concrete vibrators are internal (deep), superficial and external.

Before laying the concrete in construction is the careful validation of the established formwork and support of its forests, and fittings. The inner surface of the casing is cleaned of chips, dust and dirt. To avoid excessive suction of water from the concrete mix dry wooden formwork last watered, and the metal in order to avoid adhesion to the concrete grease. To create a protective layer on the [...]