SU1283294A1 - Method of constructing a solid foundation slab - Google Patents

Abstract

The invention relates to the construction of a monolithic base plate and makes it possible to increase its strength. In the case of erection of monolithic, the external enclosing formwork 1 is installed and the enclosed space is divided in plan into compartments 4 to form gaps 5 extending downwards between them. The compartments are filled with ordinary concrete, and the gaps are filled with concrete on the tension cement. 1 il.

Description

// x / // y

/// ///

The invention relates to the construction and relates to the construction of monolithic slabs of considerable size in the plan, in particular a monolithic foundation slab.

The purpose of the invention is to increase the strength of the plate.

The drawing shows a monolithic slab, erected by the proposed method, a vertical section.

The method is as follows.

In the manufacture of the foundation slab after installing the external formwork 1 on the concrete formwork 2 and a single reinforcement cage, the latter is divided by the internal formwork 3 into compartments 4, between which gaps 5 are left with a width of 0.4-0.7 m above and 1.2-1. 8 m low, having a cross-section view of a trapezoid with a large base to the bottom. The distances on the top are determined from the condition of workability of the concrete mix, and the bottom is determined by calculation. The layout of the gaps in the plan is not limited. The compartment dimensions are assigned so that for each of them it is possible to ensure the laying of the concrete mix with the forces and means at the disposal of the construction organization. During the construction process, the compartments are filled with ordinary concrete for their entire height in an arbitrary sequence. After that, the concrete in the compartments will gain 40-50% prism strength and concrete blocks are formed, the formwork is removed, and the concrete on the tension cement, creating seams. Expansion and hardening of concrete joints ends, as a rule, in 3-5 days. After

five

0

five

0

five

0

This amount of compression on the contact surface of ordinary concrete and concrete on the tension cement, taking into account shrinkage and fast-flowing creep, should be greater than the calculated concrete tensile strength.

The trapezoidal shape of the gaps makes it possible to realize a three-axial compression of concrete on a compressive cement, which makes it possible to obtain higher stresses in concrete, all other conditions being equal. At the same time, limiting the deformation of concrete on the tension cement in the horizontal direction provides for the presence of the reinforcement cage and the forces of friction of concrete blocks on the surface of the base, and in the vertical direction - the weight of blocks of ordinary concrete.

The proposed method allows to increase the strength of the plate, its quality and durability, as well as reduce the complexity of its implementation.

Claims (1)

Invention Formula A method of erecting a monolithic foundation slab, which includes installing reinforcement and placing concrete into the slab body with separate compartments with preliminary fencing of each compartment with formwork, characterized in that, in order to increase the strength of the slab, the compartments are enclosed with formwork adjacent compartments, and after the concrete has been laid in the compartments and the raspalubechnoy strength has been established, the gaps between the compartments are filled with concrete on the tension cement.