SU490913A1 - Machine foundation - Google Patents

Description

one

The invention relates to foundations for machines buried in the ground.

Known foundations for machines, made in the form of a concrete array, recessed into the ground. Such foundations are constructed by an IB ditch and then filled up with soil.

Pile foundations for machines are also known, including a massive concrete grillage recessed into the ground.

Possessing a relatively small amount of contact with the backfill soil, such foundations do not sufficiently utilize its effect, which manifests itself in an increase in the stiffness of the base, an increase in the damping and a decrease in the vibration amplitudes.

The purpose of the invention is to increase the effectiveness of damping baseline oscillations by increasing its contact surface with backfill soil.

For this, the lower part of the foundation is provided with flexible ribs placed inside the backfill soil.

FIG. 1 shows the proposed foundation; in terms of; in fig. 2 - the same, side view; in fig. 3, 4, 5 - foundations with different arrangement of edges; in fig. 6 - the same, side view.

The foundation includes a concrete massif 1, from the side faces of which the ribs 2 protrude, located inside the soil of the filling vertically (Fig. 1-4) or inclined (Fig. 5 and 6). The ribs 2 can be arranged to the entire height of the underground part of the basement or to a part of the height and can have a different reach.

The number and location of ribs in the plan depends on the direction of redeemable fluctuations. With vertical oscillations and vertical edges, the elastic resistance of the backfill soil to shear is used, with horizontal vibrations in the direction perpendicular to the plane of the ribs, or with vertical oscillations in the horizontal plane, the ribs 2 (Fig. 1 and 3) work as elastic plates, Zash, smiled in the ground. AT

In this case, the frontal elastic resistance of the backfill soil is used, which is significantly greater than the elastic shear resistance. With horizontal dynamic loads in one direction,

for example, two edges are perpendicular to this direction.

In the presence of horizontal forces of a double direction, for example, four edges are placed, as shown in FIG. 1 or 3. This arrangement of the ribs is effective when damping the rotational oscillations of the basement in the horizontal plane.

FIG. 4 shows a foundation with ribs 2 reinforced with vertical walls 3 arranged perpendicular to the direction

fluctuations. These walls serve as a kind of anchor for the foundation, significantly reducing its horizontal vibrations.

FIG. Figures 5 and 6 depict a foundation with obliquely positioned ribs 2, effectively using the components of both the frontal and shear resistances of the backfill soil for oscillations in any direction.

The sizes and location of the ribs are determined by calculation depending on the magnitude of the dynamic loads, their direction, soil characteristics, etc.

The proposed foundations are most effective for machines with horizontal dynamic loads.

Formula and 3 about b e and e and

The foundation for the scraper, made in the form of a concrete massif, buried in the ground, characterized in that, in order to increase the efficiency of damping it, the lower part of the foundation is provided with flexible ribs located inside the bed.

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