CN117027039A - Construction method of large-scale petroleum storage tank ring beam concrete foundation - Google Patents

Abstract

The invention provides a construction method of a large-scale petroleum storage tank ring beam concrete foundation, which belongs to the technical field of storage tank ring beam construction and comprises the following steps: A. preparing construction; B. excavating and burying a tank foundation; C. constructing a ring beam; D. backfilling construction in the ring beam: firstly, paving an HDPE film on a pavement base layer in a ring beam, and then paving a second asphalt sand cushion layer, a geotechnical cloth layer, a graded broken stone cushion layer, an HDPE film, a middle coarse sand cushion layer, a plurality of foam plate layers which are mutually bonded, a waterproof asphalt layer, a graded broken stone cushion layer, a water stop belt layer, a cement fiber plate layer, a third asphalt sand cushion layer and a polytetrafluoroethylene layer by layer in the ring beam; E. and (3) backfilling outside the ring beam: paving an HDPE film on the base layers of the inner pavement and the outer pavement of the ring beam, and paving a second asphalt sand cushion layer, a middle coarse sand cushion layer and a concrete pavement layer outside the ring beam layer by layer; F. and (5) completing the whole construction of the ring beam and handing over. The invention can effectively solve the problem that petroleum on the basis of a large storage tank leaks into soil.

Description

Construction method of large-scale petroleum storage tank ring beam concrete foundation

Technical Field

The invention relates to the technical field of storage tank ring beam construction, in particular to a construction method of a large-scale petroleum storage tank ring beam concrete foundation.

Background

One of the main objects of petroleum and geological exploration is a viscous and dark brown liquid called as industrial blood, and the upper part of the crust has petroleum storage, and the main component is a mixture of various alkanes, cycloalkanes and aromatic hydrocarbons, wherein the petroleum is essentially required to be used in a large petroleum storage tank in the storage process, and the oil storage tank is an important device for storing the petroleum, and has strategic and strategic roles in the fields of national economic development, transportation, military and the like.

However, due to the influences of engineering environment and working conditions and other factors of the oil tank, oil leakage can often occur to the tank bottom plate, the leaked oil-water mixture is extremely strong in corrosion capacity, once the oil tank is permeated into the soil of the tank area, serious pollution can be caused to the environment, and serious engineering accidents and economic losses are caused.

Disclosure of Invention

The invention aims to provide a construction method of a large-scale petroleum storage tank ring beam concrete foundation, which can effectively solve the problem that petroleum of the large-scale storage tank foundation leaks into soil.

The embodiment of the invention is realized by the following technical scheme: a construction method of a large-scale petroleum storage tank ring beam concrete foundation comprises the following steps:

A. and (3) preparation of construction: surveying and cleaning a construction site, leveling the site, carrying out construction measurement fixed points and positioning by using instruments such as a total station, a precise level and the like according to drawing data, drawing lines in the fixed points and the positioning areas by using paint, and drawing projection areas of ring beams on a road surface base layer, wherein the projection areas are specified in the construction drawing;

B. tank foundation excavation and landfill: firstly, excavating an annular groove on a pavement base layer along the right lower part of an annular beam, wherein the cross section of the annular groove is trapezoidal, paving a layer of HDPE film on the side wall of the annular groove, then burying a layer of coarse sand cushion in the annular groove, paving a layer of first asphalt sand cushion above the coarse sand cushion, and simultaneously pouring a layer of plain concrete cushion in the first asphalt sand cushion, wherein the top wall of the annular plain concrete cushion is flush with the pavement base layer;

C. and (3) ring beam construction: pouring ring beams above the plain concrete cushion layer by adopting a layer-by-layer concrete pouring method, wherein the pouring height of each layer of ring beams is 30-50mm, binding reinforcing steel bars, building templates and reinforcing templates layer by layer, integrally pouring and forming each layer of ring beams, pouring concrete layer by layer, vibrating and compacting until the required construction height of a drawing is reached;

D. backfilling construction in the ring beam: firstly, paving an HDPE film on a pavement base layer in a ring beam, and then paving a second asphalt sand cushion layer, a geotechnical cloth layer, a graded broken stone cushion layer, an HDPE film, a middle coarse sand cushion layer, a plurality of foam plate layers which are mutually bonded, a waterproof asphalt layer, a graded broken stone cushion layer, a water stop belt layer, a cement fiber plate layer, a third asphalt sand cushion layer and a polytetrafluoroethylene layer by layer in the ring beam;

E. and (3) backfilling outside the ring beam: paving an HDPE film on the base layers of the inner pavement and the outer pavement of the ring beam, and paving a second asphalt sand cushion layer, a middle coarse sand cushion layer and a concrete pavement layer outside the ring beam layer by layer;

F. and (5) completing the whole construction of the ring beam and handing over.

Further, the ring beam construction in the step C further includes: and the direction of each layer of concreting is from the same point, and the concreting is reversely poured until the layer of concreting is finished.

Further, the backfilling construction in the ring beam in the step D further includes: the water stop belt layer, the cement fiberboard layer, the third asphalt sand cushion layer and the polytetrafluoroethylene layer in the ring beam are all obliquely downwards arranged at 9-12 degrees along the periphery of the center of the ring beam.

Further, an anti-seepage film is paved between the concrete pavement layer outside the ring beam and the second asphalt sand cushion layer and in the middle coarse sand cushion layer, the anti-seepage film is arranged along the ring beam in a fitting way, and the cross section of the anti-seepage film is L-shaped.

Further, a plurality of leakage detection pipes are arranged in the circumferential communication of the ring beam, one end of each leakage detection pipe extends into the graded broken stone cushion layer above the waterproof asphalt layer in the ring beam, the other end of each leakage detection pipe extends out of the ring beam, and the leakage detection pipes are obliquely arranged.

The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:

1. according to the invention, the HDPE film is paved above the annular groove and the pavement base layer to prevent petroleum from penetrating into the pavement base layer, the first asphalt sand cushion in the annular groove can play a role of blocking leakage, the strength of the ring beam can be ensured, wherein the HDPE film, the second asphalt sand cushion, the geotechnical cloth layer, the graded broken stone cushion, the HDPE film, the middle coarse sand cushion, a plurality of foam plate layers bonded with each other, a waterproof asphalt layer, the graded broken stone cushion, a water stop belt layer, a cement fiber plate layer, a third asphalt sand cushion and a polytetrafluoroethylene layer in the ring beam can be effectively prevented from leaking, the paving mode is subjected to multiple experiments, the blocking effect is extremely good, the construction cost is low, meanwhile, the middle coarse sand cushion, the graded broken stone cushion and the cement fiber plate layer can play a good supporting role, the stability of the petroleum storage tank can be ensured, the second asphalt sand cushion, the concrete pavement layer and the impermeable film outside the ring beam can be further prevented from leaking, the layer by layer construction of the ring beam can be ensured, the crack and the like of the ring beam can be effectively prevented, so that the petroleum leakage can be effectively prevented from occurring in soil pollution and environmental loss can be effectively avoided.

2. According to the invention, the cement fiberboard layer, the water stop belt layer, the third asphalt sand cushion layer and the polytetrafluoroethylene layer in the ring beam are all obliquely downwards arranged at 9-12 degrees along the periphery of the center of the ring beam, so that petroleum can be introduced into the annular groove when the petroleum leaks, the later cleaning is convenient, the cost is saved, and whether the petroleum storage tank leaks oil can be conveniently checked by checking whether the leak detection pipe leaks oil or not, and the operation is very simple and convenient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a partial cross-sectional view of a concrete foundation construction structure of a ring beam of a large-scale petroleum storage tank provided by the invention;

fig. 2 is a schematic structural view of a casting direction of a ring beam provided by the invention;

FIG. 3 is a schematic view of the structure of the petroleum storage tank provided by the invention after being mounted on a ring beam;

fig. 4 is a schematic structural view of a ring beam and a steel bar provided by the invention.

Icon: the pavement comprises a pavement base layer, 11-annular grooves, 111-HDPE films, 112-coarse sand cushion layers, 113-first asphalt sand cushion layers, 2-plain concrete cushion layers, 3-annular beams, 31-reinforcing steel bars, 32-second asphalt sand cushion layers, 33-geotechnical cloth layers, 34-graded broken stone cushion layers, 35-middle coarse sand cushion layers, 36-foam plate layers, 37-waterproof asphalt layers, 38-water stop belt layers, 39-cement fiber plate layers, 40-third asphalt sand cushion layers, 41-polytetrafluoroethylene layers, 5-concrete pavement layers, 51-impervious films, 6-leakage detecting pipes, 71-pouring directions, 8-field areas, 9-petroleum storage tanks, 91-water collecting pits and 92-petroleum maximum liquid levels.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples

The invention further provides a construction method of a large-scale petroleum storage tank ring beam concrete foundation, which is described with reference to specific embodiments, and is shown in fig. 1-4, and comprises the following steps:

firstly, in the implementation, a petroleum storage tank D=96000mm, a water collecting pit D=660 mm, an annular beam 3 inner diameter D=95500 mm, a geotextile of 300g/m2 nonwoven, an HDPE film 111 of 2mm thickness and plain concrete of C20 are selected, wherein the water collecting pit 91 is arranged on the inner bottom wall of the petroleum storage tank 9, so that petroleum residues can be collected in the water collecting pit 91;

A. and (3) preparation of construction: surveying and cleaning a construction site, leveling the site by using mechanical equipment such as an excavator, a bulldozer and the like, carrying out construction measurement fixed point and positioning by using instruments such as a total station, a precise level and the like according to drawing data, drawing lines in the fixed point and positioning areas by using paint, and drawing a projection area of a ring beam 3 specified on a construction drawing on a pavement base layer 1, wherein in the construction measurement, coordinate measurement control is preferred, the measurement instrument is guided and tested by a coordinate control point provided by a first party by using the total station, the measurement instrument is required to be strictly tested and corrected, and is carried out under climatic conditions such as early morning, evening, cloudy days and no wind as much as possible during measurement, so that the influence of side refraction is reduced, a cross-shaped coordinate control network is arranged, a central control pile is arranged in the center of a tank, and four coordinate positioning piles are arranged on the longitudinal and transverse center lines of the tank foundation so as to facilitate lofting and rechecking in the construction process; the coordinate positioning pile is arranged on the site, is not affected by vibration and is not affected by walking of people and vehicles, is not affected by construction, is more than 15m from the side line of a foundation pit, and is used for guiding the axis to the road and the enclosing wall around a tank area, marks are arranged on the road and the enclosing wall so as to check the positioning pile, the control pile is driven into the soil by adopting a 1.5m long wood pile, the control pile is exposed for about 10cm, a small nail is driven as a control point of the axis, the floating soil is excavated, concrete is cast for protection, offset is prevented, manual damage is strictly forbidden, if looseness is found, and the test is repeated;

when the tank foundation ring beam 3 is constructed, measuring with a steel rule according to a control pile in the center of the tank, and determining a boundary line of foundation trench excavation; constructing a ring beam 3 cushion layer after backfilling the broken stone, and re-guiding control piles in the center of the measuring tank by utilizing the control piles around the ring beam; setting the edge line of the ring beam 3 by using a steel rule and a line weight according to a control pile in the center of the tank after the ring beam 3 cushion layer is constructed, marking one point on the cushion layer every 2m, drawing the inner edge line and the outer edge line of the tank foundation ring beam 3 by using an arc plate which is firstly formed on a flat ground according to the arc setting of the ring beam 3, and setting one line at two points according to the principle so as to facilitate the supporting of the inner die and the outer die of the ring beam 3;

B. tank foundation excavation and landfill: firstly, excavating an annular groove 11 on a pavement base layer 1 and along the right lower part of an annular beam 3, wherein the cross section of the annular groove 11 is in an equilateral trapezoid shape, the length of a top wall notch of the annular groove 11 is larger than the length of a bottom wall of the annular groove 11 so as to drain oil and facilitate excavation, paving a layer of HDPE film 111 on the side wall of the annular groove 11, then burying a layer of coarse sand cushion 112 in the annular groove 11, paving a layer of first asphalt sand cushion 113 above the coarse sand cushion 112, simultaneously pouring a layer of plain concrete cushion 2 in the first asphalt sand cushion 113, and flushing the top wall of the annular plain concrete cushion 2 with the pavement base layer 1, wherein the annular groove 11 and the upper part of the pavement base layer 1 are paved with the HDPE film 111 so as to prevent oil from penetrating into the pavement base layer 1, and the first asphalt sand cushion 113 in the annular groove 11 can play a role of blocking leakage, and also ensure the strength of the annular beam 3 and lower construction cost;

C. and (3) ring beam construction: the ring beams 3 are poured above the plain concrete cushion layer 2 by adopting a layer-by-layer concrete pouring method, the pouring height of each layer of ring beams 3 is 30-50mm, in the implementation, 50mm is selected for each layer of ring beams 3, the steel bars 31 are bound layer by layer, the template is built and the reinforcing template is required to be integrally poured and formed on each layer of ring beams, then the concrete is poured layer by layer and vibrated tightly until the required construction height of a drawing is reached, wherein the quality of ring beams is critical to the construction quality of a tank, and because the ring beams 3 are of a thin-wall overlength structure and are extremely easy to be influenced by temperature and shrinkage stress, cracks appear by adopting the layer-by-layer pouring method, the thickness of a steel bar 31 protective layer, the water-cement ratio of the concrete and other factors, and in order to prevent the cracks harmful to the structure, the following measures are adopted:

(1) preparing concrete by using cement with low hydration heat; (2) selecting coarse and fine aggregate with larger grain diameter and good grading, and strictly controlling the mud content of sand and stone; (3) reasonably designing a mixing ratio and controlling the dosage of single-component cement; every 10kg of cement is increased or decreased according to the test, the hydration heat of the cement can correspondingly raise the temperature of the concrete by 1 ℃; (4) adding fly ash and a high-efficiency water reducing agent, improving workability and reducing water-ash ratio; (5) adding a proper amount of concrete expanding agent to make the concrete compensate shrinkage; (6) adopting split bolts to reinforce the template, and stopping slurry leakage; (7) strictly controlling the pouring and tamping quality of the concrete, and ensuring the compaction of the concrete; (8) strictly making temperature measurement work when and after pouring the ring beam 3 concrete, if the temperature difference between the inside and outside of the concrete is overlarge, covering a grass bag on the surface for heat preservation; the temperature difference between the interior and the surface of the concrete is not more than 25 ℃; and (3) curing the reinforced ring beam 3 concrete, wherein the cured concrete cannot be directly irradiated by sunlight, the exposed surface is timely covered with a film and a cotton felt for curing, and a special person is responsible for curing, and the curing time is not less than 14 days, so that the concrete surface is kept in a wet state. The vertical steel bars 31 of the ring beam 3 are phi 12 threaded steel bars 31, the circumferential steel bars 31 are phi 28@100 threaded steel bars 31 in four layers, the steel bars 31 of the ring beam 3 are bound after the inner die is installed, the thickness of a protective layer is controlled when the steel bars 31 of the outer layer are bound, and the positions of the steel bars are controlled according to the positions of the inner die so as to prevent the steel bars 31 from being difficult to prop up the outer die due to out-of-round circles; the template is selected from: the inner mold and the outer mold of the template are made of plywood with the size of 1220 multiplied by 1700 and the thickness of 18mm, in order to enable the template to conform to the radian of the ring beam 3 as much as possible, the plywood is vertically arranged (the width of a single plywood is 1.22 m), and the error of the polygonal radius formed by the radius of the ring beam 3 and the plywood mold is 1.9mm because the inner diameter of the ring beam 3 is 95.5m and the diameter is larger, the plywood is negligible, and the plywood has flexibility and can be properly adjusted during reinforcement; and (3) installing a template: the template setting sequence is as follows: supporting the inner mold and supporting, binding the steel bars 31, supporting the outer mold and reinforcing after binding the steel bars 31; when the template is prefabricated, the three vertical edges and the plywood are nailed by iron nails, splicing edges are reserved, and wall penetrating bolt holes are drilled so as to facilitate assembly; fixing the lower opening of the template: the edge line of the ring beam 3 is sprung on the cushion layer, and the template is installed according to the sprung edge line; because the foundation trench is backfilled with broken stone, the gradient is slower, and the lower part of the template is not well supported, when the cushion layer is poured, a template with the width of 10cm is buried in the cushion layer every 1m, when the template is installed, the lower opening is fixed by using a wood clamp, and the wood clamp is nailed on the pre-buried template by using iron nails; fixing the upper opening of the template: after the verticality of the template is corrected, the template is firmly braced by using diagonal braces; adopting phi 48 steel pipes as diagonal braces; in order to ensure the stability of the support, paving a base plate on the crushed stone surface, supporting the steel pipe on the base plate, and tightly propping the base plate and the steel pipe by using a wooden wedge; in order to ensure the stability of the diagonal bracing, a vertical pull rod is arranged and is connected with an outer corrugated steel pipe of the lower opening of the template, so that the diagonal bracing is prevented from being unstable; and a horizontal pull rod is arranged; when the internal mold is supported, each mold plate is installed according to the position of the ink fountain line, and is supported firmly by an inclined strut after the verticality is corrected; four through-wall bolts are equidistantly arranged in the vertical direction of the outer die after the outer die is reinforced by adopting diagonal bracing; after the inner and outer templates are installed, measuring by adopting a total station to check whether the external dimensions of the templates meet the design requirements;

D. backfilling construction in the ring beam: firstly, paving a layer of HDPE film 111 on a pavement base layer 1 in a ring beam 3, then paving a second asphalt sand cushion 32, a geotechnical cloth layer 33, a graded broken stone cushion 34, the HDPE film 111, a medium coarse sand cushion 35, a plurality of layers of foam plate layers 36 which are bonded with each other, a waterproof asphalt layer 37, a graded broken stone cushion 34, a water stop belt layer 38, a cement fiber plate layer 39, a third asphalt sand cushion 40 and a polytetrafluoroethylene layer 41 layer by layer in the ring beam 3; the HDPE film 111, the second asphalt sand cushion 32, the geotechnical cloth layer 33, the graded broken stone cushion 34, the HDPE film 111, the medium coarse sand cushion 35, a plurality of layers of foam plate layers 36, a waterproof asphalt layer 37, the graded broken stone cushion 34, a waterproof belt layer 38, a cement fiberboard layer 39, a third asphalt sand cushion 40 and a polytetrafluoroethylene layer 41 in the ring beam 3 can effectively prevent petroleum leakage, the laying mode is subjected to multiple tests, the blocking effect is excellent, the construction cost is low, meanwhile, the medium coarse sand cushion 35, the graded broken stone cushion 34 and the cement fiberboard layer 39 can play a good supporting role, the stability of the petroleum storage tank 9 is ensured, and the waterproof asphalt layer 37 is also coated on the inner wall of the ring beam 3 and above the leak detection pipe 6, so that petroleum leakage is further prevented;

wherein the technical requirements of the medium coarse sand backfill construction (1) are as follows:

1) The middle coarse sand should adopt middle and coarse sand organic impurities with hard textures, the mud content is not more than 5%, and the silt is not needed; 2) The compaction factor of the medium coarse sand cushion 35 is not less than 0.96; 3) Middle sand: sand with the grain diameter of more than 0.25mm and the grain content of less than 0.5mm being more than 50 percent of the total weight; 4) Coarse sand: sand with the grain diameter of more than 0.5mm and the grain content of less than 2mm being more than 50 percent of the total weight;

the sand cushion layer is laid in layers, backfilled according to the designed thickness, and vibrated back and forth by a flat vibrator for 8-10 times; watering and wetting in the construction process, so that the water content of the sand is kept at about 15% -20%; the reciprocating times are checked by ring cutter sampling, and the compaction coefficient lambda is more than or equal to 0.96; when the vibrator moves, each row is overlapped by one third so as to prevent vibration; during construction, auxiliary reinforcing steel bars are driven in every 2m to serve as elevation control points for controlling elevation of the sand cushion; re-measuring the elevation of the surface after construction, checking and flattening by a stay wire, flattening by an excessively high person and compensating by an excessively low person, vibrating by a flat vibrator to be compact, and preparing for the construction of an asphalt sand insulating layer; calculating the virtual height and paying attention to reserving the compaction thickness during laying;

the geotechnical cloth layer 33 is manually rolled and paved; the cloth cover is flattened, a deformation allowance is properly reserved, and the geotextile is installed by hot bonding or sewing; the HDPE film 111 is bonded together with waterproof glue between the joints to prevent oil leakage, and the cement fiberboard layer 39 is bonded together with waterproof glue to prevent oil leakage;

E. and (3) backfilling outside the ring beam: paving a layer of HDPE film 111 on the inner and outer pavement base layers 1 of the ring beam 3, and paving a second asphalt sand cushion layer 32, a middle coarse sand cushion layer 35 and a concrete pavement layer 5 outside the ring beam 3 layer by layer;

F. and (5) completing the whole construction of the ring beam and handing over.

Referring to fig. 1 to 2, the ring beam 3 construction in step C further includes: and D, pouring the concrete in the same direction from the same point, and reversely pouring until the pouring of the concrete is completed, wherein the backfilling construction in the ring beam 3 in the step D further comprises the following steps: the water stop belt layer 38, the cement fiberboard layer 39, the third asphalt sand cushion layer 40 and the polytetrafluoroethylene layer 41 in the ring beam 3 are all obliquely downwards arranged at 9-12 degrees along the periphery of the center of the ring beam 3, and in the implementation, the inclination angle along the periphery of the center of the ring beam 3 is 11 degrees, so that when petroleum leaks, the petroleum can be introduced into the annular groove 11, the later cleaning is convenient, and the cost is saved.

Referring to fig. 1, an anti-seepage film 51 is laid between the concrete pavement layer 5 outside the ring beam 3 and the second asphalt sand cushion 32 and in the middle coarse sand cushion 35, the anti-seepage film 51 is attached to the ring beam 3, the cross section of the anti-seepage film 51 is L-shaped, the anti-seepage film 51 can effectively prevent oil leakage, a plurality of leakage detection pipes 6 are arranged in circumferential communication of the ring beam 3, one ends of the leakage detection pipes 6 extend into the graded broken stone cushion 34 above the waterproof asphalt layer 37 in the ring beam 3, the other ends extend out of the ring beam 3, the leakage detection pipes 6 are obliquely arranged, whether the oil storage tank 9 leaks oil can be conveniently checked through checking whether the leakage detection pipes 6 leak oil, the operation is very simple and convenient, the oil leakage into the soil can be effectively prevented by the construction method in total, environmental pollution and economic loss are avoided, and the service life of the whole ring beam 3 and the oil storage tank 9 is prolonged.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A construction method of a large-scale petroleum storage tank ring beam concrete foundation is characterized by comprising the following steps: the method comprises the following steps:

A. and (3) preparation of construction: surveying and cleaning a construction site, leveling the site, carrying out construction measurement fixed points and positioning by using instruments such as a total station, a precise level and the like according to drawing data, drawing lines in the fixed points and the positioning areas by using paint, and drawing projection areas of ring beams (3) specified on a construction drawing on a pavement base layer (1);

B. tank foundation excavation and landfill: firstly, excavating an annular groove (11) on a pavement base layer (1) and along the right lower part of an annular beam (3), wherein the cross section of the annular groove (11) is trapezoidal, paving a layer of HDPE film (111) on the side wall of the annular groove (11), then burying a layer of coarse sand cushion (112) in the annular groove (11), paving a layer of first asphalt sand cushion (113) above the coarse sand cushion (112), and simultaneously pouring a layer of plain concrete cushion (2) in the first asphalt sand cushion (113), wherein the top wall of the annular plain concrete cushion (2) is flush with the pavement base layer (1);

C. and (3) ring beam construction: pouring ring beams (3) above the plain concrete cushion layer (2) by adopting a layer-by-layer concrete pouring method, wherein the pouring height of each layer of ring beams (3) is 30-50mm, binding reinforcing steel bars (31), building templates and reinforcing templates layer by layer, integrally pouring each layer of ring beams (3) for molding, pouring concrete layer by layer, vibrating and compacting until the required construction height of a drawing is reached;

D. backfilling construction in the ring beam: firstly, paving a layer of HDPE film (111) on a pavement base layer (1) in a ring beam (3), then paving a second asphalt sand cushion layer (32), a geotechnical cloth layer (33), a graded broken stone cushion layer (34), a HDPE film (111), a middle coarse sand cushion layer (35), a plurality of layers of foam plate layers (36) which are adhered to each other, a waterproof asphalt layer (37), a graded broken stone cushion layer (34), a water stop belt layer (38), a cement fiber plate layer (39), a third asphalt sand cushion layer (40) and a polytetrafluoroethylene layer (41) layer by layer in the ring beam (3);

E. and (3) backfilling outside the ring beam: paving a layer of HDPE (high-density polyethylene) film (111) on the inner and outer pavement base layers (1) of the ring beam (3), and paving a second asphalt sand cushion layer (32) to a middle coarse sand cushion layer (35) to a concrete pavement layer (5) outside the ring beam (3) layer by layer;

F. and (3) completing the integral construction of the ring beam (3) and handing over.

2. The construction method of the large-scale petroleum storage tank ring beam concrete foundation according to claim 1, which is characterized by comprising the following steps: the ring beam (3) construction in step C further comprises: and the direction of each layer of concreting is from the same point, and the concreting is reversely poured until the layer of concreting is finished.

3. The construction method of the large-scale petroleum storage tank ring beam concrete foundation according to claim 1, which is characterized by comprising the following steps: the backfilling construction in the ring beam (3) in the step D further comprises the following steps: the water stop belt layer (38), the cement fiberboard layer (39), the third asphalt sand cushion layer (40) and the polytetrafluoroethylene layer (41) in the ring beam (3) are all obliquely downwards arranged at 9-12 degrees along the center of the ring beam (3) towards the periphery.

4. The construction method of the large-scale petroleum storage tank ring beam concrete foundation according to claim 1, which is characterized by comprising the following steps: and E, the backfilling construction outside the ring beam (3) in the step further comprises the following steps: and an anti-seepage film (51) is paved between the concrete pavement layer (5) outside the ring beam (3) and the second asphalt sand cushion layer (32) and in the middle coarse sand cushion layer (35), the anti-seepage film (51) is arranged along the ring beam (3) in a fitting way, and the cross section of the anti-seepage film (51) is L-shaped.

5. The construction method of the large-scale petroleum storage tank ring beam concrete foundation according to claim 1, which is characterized by comprising the following steps: the circumference intercommunication of ring beam (3) is provided with a plurality of leak hunting pipes (6), in the gradation rubble bed course (34) of waterproof asphalt layer (37) top in ring beam (3) are stretched into to the one end of leak hunting pipe (6), and the other end stretches out outside ring beam (3), just leak hunting pipe (6) are the slope setting.