RU2321704C2 - Vertical steel tank base - Google Patents

Abstract

FIELD: construction, particularly to erect large-volume vertical oil and oil product tanks in soft ground.

SUBSTANCE: tank base comprises round support slab bearing upon ground bed and supports. The supports are distributed along outermost support slab perimeter and are made as conical ground piles having side surfaces defined by generators inclined at angle equal to natural ground slope of the pile. The supports are grouped in two rows along slab perimeter. Two rows of flat slabs are laid on ground pile. The slabs are welded with each other and grouted in top parts thereof.

EFFECT: increased tank base stability and increased vertical load bearing ability.

2 cl, 2 dwg

Description

The invention relates to reservoir engineering, in particular to the construction of large steel vertical tanks for storing oil and oil products on weak bearing soils.

A tank of large capacity is known (AS USSR 1173006, class E02D 27/38, 1985), the foundation of which includes a round base plate located on an earth cushion and inclined cords passing through an earth cushion.

A disadvantage of the known technical solution is the lack of stability of the foundation, if necessary, to build it on soft soils and the inability to absorb horizontal loads.

The well-known foundation of the reservoir (RU 2209883 C1, class E02D 27/38, 2003), including a base plate resting on an earth cushion, inclined cords passing through an earth cushion. The plate has the shape of a truncated cone, to its central part and the lower edges of the conical part there are attached radially diverging strands-rods, joined in pairs at the lower edges by beams.

The well-known foundation of an elevated cylindrical tank, including a round base plate and strands located along its perimeter, each of which is connected at its end to an anchor plate buried in the ground (A.S. USSR 1173006, B.I. 3, 1985).

The disadvantage of this foundation is the large deflections of the flat slab and the possibility of crushing the cords with uneven compressibility of the soil of the base.

The prototype of the proposed invention is the foundation for a cylindrical tank (RU 2203361 C2, class E02D 27/38, 2003), including a round base plate located on an earth cushion. The foundation contains an inclined annular rib along the perimeter of the maximum circumferential slab and reinforced concrete beams connected to it, radially converging to the center of the conical recess of the base, the ground cushion is made in the form of a truncated cone.

A disadvantage of the known technical solution is the low bearing capacity of the foundation, if necessary, to build it on weakly and strongly compressible soils and insufficient reliability when exposed to horizontal loads.

The objective of the present technical invention is to increase the stability of the base of the tank, if necessary, build it on weakly bearing soils and the ability to absorb horizontal loads.

The task is achieved by the fact that in the base for a vertical steel tank including a round base plate located on an earth cushion and supports located around the perimeter of the maximum circumference of the base plate, according to the invention, the supports are made in the form of dumping loose soil conical shape, with an angle the inclination of the generators, equal to the angle of natural slope of the soil in the dumping support, and are located along the perimeter of the maximum circumference of the slab in two rows, while flat slabs are laid in two rows on the dump rows that weld and monopolize at the top.

The opening angle at the top of the support can be determined from the equation α = 180-2β _e ,

where β _e is the angle of repose of the soil in the dumping supports;

α is the opening angle at the top of the supports.

The technical result of the claimed invention lies in the fact that the supports having a conical shape increase the area of bearing on the ground, thereby increasing the resistance to moment and horizontal loads.

The invention is illustrated by drawings, where figure 1 shows a section of the base of the tank (side view), figure 2 is a plan (top view).

The base includes a round base plate 1, resting on an earth cushion 2 and supports 3 of a loose body, the supports are conical in shape, with an opening angle at the apex equal to α = 180-2β _e , the conical part of the support 4 forms an angle with a horizontal surface β _e .

The base is erected in the following sequence: they dig a pit. On the maximum perimeter of the pit, they fill out the dumping from specially prepared sandy soil in two rows. The dump has a conical shape. Flat horizontal slabs are laid on the dump, which are welded and monolithic at the top. Then lay down and compact the soil cushion. Install a round base plate.

The present invention can be used in reservoir engineering, in particular in the construction of large steel vertical tanks for storing oil and oil products on weakly bearing soils.

Claims (2)

1. The base for a vertical steel tank, including a round base plate located on the soil cushion and supports located around the perimeter of the maximum circumference of the base plate, characterized in that the supports are made in the form of dumping loose soil conical shape, with an angle of inclination equal to the angle of the natural the slope of the soil in the filling of the support, and are located along the perimeter of the maximum circumference of the plate in two rows, while flat plates in two rows are laid on the filling, which are welded and monolithic at the vertices e. 2. The base according to claim 1, characterized in that the opening angle at the top of the support can be determined from the equation α = 180-2β _e , where β is the angle of repose of the soil in the dumping supports; α is the opening angle at the top of the supports.

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