RU2242563C1 - Reservoir base preparation method - Google Patents

Abstract

FIELD: building, particularly foundations for large vertical steel reservoirs, preferably built on macroporous grounds.

SUBSTANCE: method involves digging out foundation pit; compacting ground of foundation pit by ramming thereof and arranging ground padding. Base before ramming thereof is divided into a number of ring areas with taking into consideration non-uniformity of flexible reservoir bottom immersion and ramming of above areas is performed in multi-stage manner beginning from central area. At the first ramming stage central area is settled up to level of neighboring area and excessive non-compacted ground is cut off up to above level. At the second stage central area and neighboring ring area are settled up to level of the next area and excessive non-compacted ground is cut off up to this level. Above operations are repeated. At the last stage all areas are rammed simultaneously up to necessary design level with providing desired density of all areas.

EFFECT: possibility of uniform reservoir bottom immersion, increased service life.

3 dwg

Description

The invention relates to construction and can be used in the preparation of the bases of large vertical steel tanks, primarily erected on macroporous soils.

It is known that the bottoms of steel tanks taken as round absolutely flexible plates with a flexibility index S> 10 bend unevenly. The center gives a draft 1.24-1.57 times greater than the edges (see Gorbunov-Posadov M.I., Malikova T.A., Solomin V.I. Design calculation on an elastic foundation. - M.: Stroyizdat, 1984. - 679s ., ill.).

There is a method of preparing the base of the tank, including the development of the pit, the device of the soil cushion (see Ivanov Yu. K., Konovalov P. A., Mangushev R. A., Sotnikov S. N. Foundations and foundations of tanks. - M: Stroyizdat, 1989 )

The disadvantage of this method is that, somewhat reducing precipitation, it does not affect their unevenness. Moreover, with large diameters of the tanks, a pillow with a thickness of about 3 m makes up a small part of the compressible thickness.

A known method of preparing the base of the tank, including a fragment of the pit, compaction of the soil with heavy rammers, the device of the soil cushion (see the reference manual on mechanized compaction of the soil M .: Stroyizdat. - 1965., where on page 152, Fig. 53 shows the compaction of the soil with a ramming plate - prototype). Typically, the seal is uniform across the site.

The disadvantage of this method is that uniform compaction of the soil also does not equalize precipitation and leads to incomplete emptying of reservoirs, accumulation of produced water and accelerated corrosion of the bottom material.

The objective of the invention is the alignment of sediment bottoms of tanks and ensuring the long-term operation.

The problem is achieved in that in the method of preparing the base of the tank, including a fragment of the pit, compaction of the soil with rammers, the device of the soil cushion, characterized in that the base before compaction is divided into a number of annular sections, taking into account the uneven sediment of the flexible bottom of the tank and rammed them in stages, starting from the central section, at the same time, at the first stage of tamping, the central section is precipitated to the mark of the neighboring section, from which the next and the remainder after tamping begin at the first stage, unconsolidated soil is cut to the same mark, at the next stage, the central and adjacent annular sections are precipitated to the mark of the next neighboring section with subsequent cutting of unconsolidated soil, the same operations are repeated in the next steps, and at the last stage, all sections are compacted to the necessary planning mark, providing the required density for different parts of the base.

The novelty of the proposed method lies in the fact that the foundation before compaction is divided into sections, and soil cutting in each section is carried out in stages with a shortage, taking into account the subsequent maximum settling during compaction to the necessary planning mark. After tamping the central part, the remaining unconsolidated soil is cut to the mark of the next annular surface, then the operation is repeated for the following parts of the base.

The invention is illustrated in the drawing, where figure 1 shows a plan of the base, divided into sections. Figure 2 is a cross section showing the levels of the annular sections, from which the soil is compacted step by step to the necessary planning mark. In Fig. 3, steps (a-d) of compaction of the base with a tamper showing the sequence of cutting the soil.

The method of preparing the base is as follows. The foundation pit 1 is first opened, then the base in the plan is divided into a number of sections 2-5 (Fig. 1), which are gradually condensed with a different number of strokes to the necessary planning mark 6 (Fig. 2).

At the first stage of tamping (Fig. 3, a), the central section 2 is deposited to the mark of the neighboring section 3, from which the next stage of tamping begins. In this case, the unconsolidated soil 7 remaining after tamping is cut to the same level. In the next stage (Fig. 3.6), sections 2 and 3 are deposited to the mark of the neighboring section 4, followed by cutting off the unconsolidated soil 7. A similar operation is repeated in the next step (Fig. 3, c). At the last stage (figure 3, g) is the compaction of all sections at the same time.

As a result, when upsetting to the necessary planning mark of 6 selected soil sections 2-5, the required density of 8 for different parts of the base is achieved during tamping.

Claims (1)

The method of preparing the base of the tank, including a fragment of the pit, compaction of the soil with rammers, the device of the soil cushion, characterized in that the base before compaction is divided into a number of annular sections, taking into account the unevenness of the sediment of the flexible bottom of the tank and rammed them in stages, starting from the central section, with the first at the tamping stage, the central section is precipitated to the mark of the neighboring section, from which the next one begins, and the unconsolidated soil remaining after tamping at the first stage is cut off to the same mark, in the next step, the central and neighboring annular sections are precipitated to the mark of the next neighboring section with subsequent cutting of unconsolidated soil, the same operations are repeated in the next steps, and at the last stage, ramming of all sections simultaneously to the necessary planning mark, ensuring the required density for different parts of the base.

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