RU2437988C1 - Base of cylindrical reservoir - Google Patents

Abstract

FIELD: construction. ^ SUBSTANCE: base of a cylindrical reservoir consists of a layerwise compacted soil cushion reinforced with layers of geogrid/geotextile with rigid circular elements for their tensioning. The reinforced soil cushion comprises the upper part of permanent structural thickness and the lower part that has thickness that increases from the origin of the generatrix passing from the bottom of the reservoir wall at the angle of 28 to the horizontal line for sand soil and 40 for crushed stone, to the thickness of 3-6 m, which depends on base compressibility. ^ EFFECT: levelling vertical deformations of the reservoir bottom. ^ 1 dwg

Description

The invention relates to construction and can be used in the construction of vertical cylindrical tanks on weak compressible soils.

It is known the device of the bases in the form of soil pillows (Dolmatov B.I. Soil mechanics, bases and foundations. L., S.I. 1988, p.297, Fig.12.10). Such pillows redistribute stresses from the foundations to a large area, reducing stresses transmitted to soft soils.

Known soil cushions reinforced with geotextile cloths (Jones K.D. Constructions from reinforced soil. M., S.I. 1989, p.21, Fig. 3.18).

The disadvantage of such reinforcing with the large sizes of reinforcing canvases is the possibility of their stretching and deflection in the areas of maximum loads (Jones K.D. Constructions from reinforced soil. M., S.I. 1989, p.133, fig.6.32, p.134, fig. 6.39).

A technical solution is known where the base of a cylindrical tank consists of a layer-compacted soil cushion reinforced with geotextile / geogrid webs stretched over rigid ring elements to achieve the effect of an “inextensible web” (Patent RU No. 2308574 C1, bull. No. 29, 10/20/2007 - prototype).

As the practice of operating tanks shows, the disadvantage of soil cushions is the unevenness of the base sediment with a deflection in the center (Ivanov Yu.K., Konovalov PA, Mangushev RA, Sotnikov SN “Foundations and foundations of reservoirs.” M. , Stroyizdat, 1989, p. 55, fig. 3.2, p. 59, fig. 3.6). Such sediments cause stretching and rupture of the bottom, the accumulation of produced water, corrosion of the bottom and suffusion of the soil base.

The technical solution to the problem is to increase the life of cylindrical tanks due to uniform settlement of the tank wall and the middle of the bottom.

The task is achieved in that the base of the cylindrical tank consists of a reinforced soil cushion with rigid annular elements on which a geotextile / geogrid is stretched, according to the invention, the upper part of the cushion has a constant thickness and the lower part has a thickness that increases from the beginning of the generatrix extending from the bottom of the tank wall at an angle to the horizontal of 28 ° for sandy soil and 40 ° for crushed stone, up to a thickness of 3-6 m, depending on the compressibility of the base.

The novelty of the proposed proposal is due to the fact that the alignment of precipitation is achieved by optimizing the sediment diagram in the form of an armored primer pillow: more sediment - a thicker pillow; less sediment - a thinner pillow.

According to the patent and scientific and technical literature, no such solution was found, which indicates the inventive step of the application.

The invention is illustrated in the drawing, which shows a section of the tank and the base with a reinforced soil cushion.

The base of the cylindrical tank consists of a layer-by-layer compacted soil cushion 1 reinforced with layers of geogrid / geotextile 2 with rigid annular elements 3 for their tension, moreover, the armored cushion 1 consists of the upper part 4 of constant structural thickness (h1 is the height of the embankment to the bottom of the tank and h2 - the thickness of the soil to be cut) and the lower part 5 of variable thickness increasing from the beginning of the generatrix 6, extending from the bottom of the tank wall at an angle to the horizontal of 28 ° -40 ° depending on the material of the soil pillows (28 ° - angle of internal friction φ of sand and 40 ° - φ of crushed stone), up to a thickness of 3-6 m, depending on the compressibility of the base. The thickness of the soil cushion of 3 m is due to the minimum difference in stiffness between the upper 4 and lower 5 parts, at which the alignment of sediments will be significant. The maximum thickness of the soil cushion of 6 m is due to economic feasibility, in which soil replacement is less costly than the construction of a pile foundation. The exact thickness of the cushion depends on the compressibility of the base.

The base of the reservoir of variable stiffness is constructed in the following sequence.

Preliminarily cut the soil layer of the upper part of the pillow 4, then dig a pit of variable depth for the device of the lower part of the pillow 5, and the depth increases from the beginning of the generatrix 6, passing from the bottom of the tank wall at an angle to the horizontal of 28 ° -40 ° depending on the material of the soil of the pillow, to a thickness of 3-6 m, depending on the compressibility of the base. Next, lay the reinforcing elements 2 on the compacted soil layers and fix them with tension to the rigid ring elements 3. The sequence of operations on compaction of the soil layers and laying of the reinforcing elements is repeated until the end of the construction of the base of the tank.

Claims (1)

The base of the cylindrical tank, consisting of a reinforced soil cushion with rigid annular elements on which a geotextile / geogrid is stretched, characterized in that the upper part of the cushion has a constant height and the lower part has a thickness that increases from the beginning of the generatrix extending from the bottom of the tank wall at an angle to the horizontal 28 ° -40 ° depending on the material of the soil of the pillow, and to a thickness of 3-6 m, depending on the compressibility of the base.

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