Horizontal bullet can ring-wrapped sand filling stabilization process

Abstract

The invention discloses a horizontal bullet tank ring-wrapped sand filling stabilization process. On the basis of the original technology, the dynamic load of the sand bed when the equipment is in place is improved by changing the sand bed type, redesigning the sand bed stability structure, setting a crushed stone drainage layer, adding a concrete top cover and other measures, effectively ensuring the bearing capacity of the sand bed, enhancing stability, preventing lateral stress, preventing the tank body from deflecting, ensuring the quality of the sand bed, reducing the construction workload in terms of economic benefits, effectively extending the service life of the bullet tank, reducing costs, meeting the requirements of short construction period, high efficiency and fast speed, and providing a new construction method for stabilizing large horizontal containers.

Description

Technical Field

[0001] The invention belongs to the field of in-situ installation of a soil covering tank, and in particular relates to a ring-wrapped sand filling stabilization process for a horizontal bullet tank. Background Art

[0002] At present, the sand bed structure used in the soil-covered bullet tanks abroad is that a single tank or multiple tanks arranged side by side are placed in a soil-covered structure, and each tank is directly placed on the sand bed above the highest groundwater level, and the sand bed is a continuous sand bed; the outer surfaces of all tanks are completely covered with soil / sand layers, and the soil-covered bullet tanks are surrounded by sand. A retaining wall is arranged around the covering soil / sand layer, and a water dispersion slope and an open drainage ditch are arranged at the outer foot of the retaining wall.

[0003] The disadvantage of this method is that the tank is placed directly on the sand bed, which is the carrier for bearing the weight of the equipment. Since the bullet tanks of chemical enterprises are hundreds of meters long and weigh thousands of tons, the sand layers around them are tightly compacted after being laid flat, which can easily cause the tank to shift. Long-term erosion by rainwater can easily cause the sand bed to settle. There is no sandbag layer around the tank to form an integral sand bed, and the probability of long-term displacement of the equipment is high. Due to long-term chemical erosion and accumulation of precipitation in the factory, some chemicals penetrate into the surface of the equipment through the sand layer, affecting the equipment and shortening its service life. The water dispersion slope and drainage ditch outside the covering layer can only drain rainwater outside the covering layer, and the accumulated water in the sand bed cannot be discharged, which harms the stability of the sand bed.

[0004] Therefore, it is necessary to improve the sand bed structure to overcome the above defects. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses a horizontal bullet tank ring-wrapped sand filling stabilization process. By changing the sand bed type, redesigning the sand bed stability structure, setting a gravel drainage layer, adding a concrete top cover and other measures, the dynamic load of the sand bed when the equipment is in place is improved, the bearing capacity of the sand bed is effectively guaranteed, the stability is enhanced, and lateral stress is prevented, so that the tank body will not deviate, the quality of the sand bed is guaranteed, the construction amount is reduced, the cost is reduced, and the service life of the equipment is effectively extended.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The horizontal bullet tank ring-wrapped sand filling stabilization process includes the following steps:

[0008] (1) Laying the sand bed:

[0009] (11) First build a reinforced concrete base plate, then build a 50 cm high wall on the outside of the base plate, set up a water stop strip, and leave two gaps in the length direction of the wall;

[0010] (12) Except for the two gaps, a 70 cm high main foundation sand cushion layer is laid on the rest of the ground (not on the inner wall of the wall).

[0011] (13) At the location where the bullet cans are placed, lay a circular main foundation sand cushion with a support angle of 120° and a thickness of 30 cm;

[0012] (14) Along the outer side of the arc-shaped main foundation sand cushion layer, several layers of sand-filled geobags are stacked as dynamic load walls. Every two layers of sand-filled geobags are back-wrapped with geogrids. The length direction of the geogrid is longitudinal, and the outward inclination angle of the dynamic load wall is 60°;

[0013] (15) A reinforcement wall in the opposite direction is set outside the dynamic load wall, and the inward inclination angle of the reinforcement wall is 75°; the reinforcement wall is composed of several layers of sand-filled geobags, and every two layers of sand-filled geobags are back-wrapped with geogrids. The dynamic load wall and the reinforcement wall have the same height and are ≤190cm;

[0014] (16) Fill the main foundation sand cushion layer between the dynamic load wall and the reinforcement wall to finally form a sand bed with a final height of ≤190cm;

[0015] (17) The sand bed is divided into three sections;

[0016] (2) The bullet cans are placed in place

[0017] (21) Two groups of SPMT vehicles are used to transport bullet cans, and the bullet cans are supported by two groups of support seats. One group of support seats includes two arc-shaped saddles and two load-carrying beams. The lower sides of the two ends of the saddles are concave square grooves, and the load-carrying beams are transversely fixed in the square grooves. The width of the saddle is less than the height of the lowest point of the arc of the sand bed. The load-carrying beams are fixed on the SPMT vehicles, and the two ends of the load-carrying beams extend out of the two sides of the SPMT vehicles. The bullet cans are placed flat on the four arc-shaped saddles. The outer periphery of the bullet cans is bounded by flat belts, and the two ends of the flat belts are fixed to the lifting ears of the saddles;

[0018] (22) Use a crane to place piers at the gaps, and the SPMT vehicle is raised. The bullet tank passes over the dynamic load wall and the reinforcement wall and enters the site. After finding the correct direction, the SPMT vehicle lowers the height and places both ends of the load-bearing beam on the reserved piers. At this time, the lowest end of the bullet tank is higher than the bottom of the sand bed, and the SPMT vehicle withdraws.

[0019] (23) Place a jack under the load-sharing beam and use the jack to adjust the elevation so that the bullet can is placed flat on the sand bed;

[0020] (24) Use gas welding to remove the load beam, and use a crane to place the saddle horizontally and transport it out through a ground ox;

[0021] (3) Fill the gap, fill the space reserved by the SPMT truck with sand, pile up sandbags, build a retaining wall on the wall, with corbels on the retaining wall, and place sandbags on the inside of the retaining wall to form a stable wall, which is also back-packed with geogrids. A 500mm gravel drainage layer is set under the stable wall.

[0022] (4) Fill the bullet can with sand to cover it;

[0023] (5) The prefabricated top cover is placed on the corbels to seal the sand bed.

[0024] As an improvement of the present invention, the width of the saddle is less than 1 m.

[0025] As an improvement of the present invention, the geogrid is connected to the previous layer of geogrid by a connecting rod.

[0026] As an improvement of the present invention, the heights of the dynamic load wall and the reinforcement wall do not exceed the longitudinal travel of the SPMT vehicle.

[0027] As an improvement of the present invention, three vibrating-wire earth pressure gauges are buried at both ends of the sand bed.

[0028] As an improvement of the present invention, the weight of each geotechnical bag filled with sand and the drainage bag filled with gravel is ≤50kg, and the flattened dimensions of the bag body are 0.75m in length and 0.55m in width.

[0029] As an improvement of the present invention, after step (23), the dynamic load wall is piled up to 3.5 m.

[0030] As an improvement of the present invention, the upper surface of the prefabricated top cover is an outwardly convex arc.

[0031] As an improvement of the present invention, drainage grooves are provided on the sides of the corbels.

[0032] The beneficial effects of the present invention are:

[0033] 1) Change the sand bed type: prevent the flow of sand through the construction between sand, geobags and geogrids, prevent the tank from shifting and enhance stability;

[0034] 2) The geogrid is connected by connecting rods to wrap the two layers of sandbags into an independent whole. The overlap length is not less than 3m, which greatly improves the dynamic load of the sand bed when the equipment is in place, better solves the sand bed settlement problem and increases the overall sand bed bearing capacity, prevents lateral stress, prevents the tank from deflecting, and ensures the safety of the equipment;

[0035] 3) The first layer below the sand bed is equipped with a main foundation sand cushion layer, and then a single-layer arc is formed with a sand filling thickness of 300mm. Geogrids are used to form a stable unit, and the sand bed is reinforced with sandbags (from the middle to the inner wall of the retaining wall, they are: dynamic load wall to resist the lateral stress of the tank body, sand bed stability reinforcement wall, and overall stability wall after the tank body is in place). The dynamic load wall to resist the lateral stress of the tank body is a 60° sandbag layer set at a height of 1.9m on both sides of the tank body contour to avoid the sand bed being subjected to a large force at the moment of tank installation, causing the equipment to shift; the sand bed stability reinforcement wall is a sandbag inclined outward with an inclination angle of 75° to ensure the bearing capacity of the sand bed, used for stability reinforcement, and ensure that the sand bed can be safely installed with the tank body; the overall stability wall after the tank body is in place is a 3.5m high sandbag set close to the wall, 90° to the bottom. After installation, it is used to protect the wall to prevent damage to the tank body due to overall sinking;

[0036] 4) A 500mm gravel layer is set at the bottom of the inner wall of the retaining wall. The sandbags are filled with gravel or pebbles for drainage to avoid excessive rain in the rainy season, which will cause buoyancy and affect the quality of the sand bed, causing the tank to shift and effectively avoid settlement;

[0037] 5) As the tank is in a chemical plant, some chemicals will fall on the tank over time. Adding a concrete cover can prevent the chemicals from penetrating into the sand bed and causing damage to the tank, thus affecting the service life of the equipment.

[0038] 6) Under normal circumstances, the saddle cannot be taken out directly after the bullet can is in place. In the present invention, the width of the saddle is smaller than the height of the lowest point of the arc of the sand bed. After the bullet can is in place, the saddle can be turned down and placed horizontally. Finally, the saddle is taken out and transported out from the gap between the can and the ground by the ground ox. The overall structure is simple and practical, with high stability and safety, and can be reused, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is an overall schematic diagram of the installation of the present invention.

[0040] Figure 2 This is a diagram of the internal reinforcement of the sand bed described in the present invention.

[0041] Figure 3 It is a schematic diagram of the support seat described in the present invention.

[0042] Figure 4 This is a schematic diagram of the SPMT vehicle transportation described in the present invention.

[0043] Figure 5 This is a schematic diagram of the bullet can just being put down in step (22) of the present invention.

[0044] Figure 6This is a schematic diagram of the geogrid return package described in the present invention.

[0045] Figure 7 This is a schematic diagram of the position of the vibrating-wire earth pressure gauge described in the present invention.

[0046] List of Figure Symbols:

[0047] 1. Arc-shaped main foundation sand cushion, 2. Bottom plate, 3. Fence, 4. Main foundation sand cushion, 5. Gap; 6. Bullet can, 7. Dynamic load wall, 8. Sand-filled geobag; 9. Geogrid, 10. Reinforced wall, 11. Sand bed, 12. SPMT vehicle, 13. Support seat, 14. Saddle, 15. Load-sharing beam, 16. Square trough, 17. Flat belt, 18. Pier, 19. Jack, 20. Retaining wall, 21. Corbel, 22. Stable wall, 23. Gravel drainage layer, 24. Top cover, 25. Drainage trough, 26. Lowest point of sand bed arc, 27. Connecting rod, 28. Vibrating-wire earth pressure gauge. DETAILED DESCRIPTION

[0048] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0049] As shown in the figure, the horizontal bullet can ring-wrapped sand filling stabilization process of the present invention includes the following steps:

[0050] (1) Laying the sand bed:

[0051] First, a reinforced concrete base plate 2 is built, and a 50cm high wall 3 is built on the outside of the base plate, and a water stop strip is set. Two gaps 5 are left in the length direction of the wall 3; except for the two gaps 5, a 70cm high main foundation sand cushion layer 4 is laid on the other base plates 2 (the inner wall of the wall is left empty and no sand is laid), and the compaction coefficient is greater than 0.9. Then, at the location where the bullet can 6 is placed, an arc-shaped main foundation sand cushion layer 1 is laid to fit with the side of the can body (with the same curvature as the can body to ensure that the can body fits tightly with the sand bed when in place). The arc-shaped main foundation sand cushion layer has a support angle of 120° and a thickness of 30cm; at this time, the total thickness of the lowest point of the arc of the sand cushion layer is 1m (leaving space for taking out the saddle 14);

[0052] Along the outer side of the arc-shaped main foundation sand cushion layer 1, several layers of sand-filled geobags 8 are stacked as dynamic load walls 7, and every two layers of sand-filled geobags 8 are back-wrapped with geogrids 9, such as Figure 6 As shown, the length direction of the geogrid 9 is longitudinal, and the outward inclination angle of the dynamic load wall 7 is 60°; Figure 1 and 2 As shown;

[0053] A reinforcement wall 10 is arranged in the opposite direction outside the dynamic load wall 7, and the inward inclination angle of the reinforcement wall 10 is 75°; Figure 2 As shown; the reinforcement wall 10 is formed by stacking several layers of sand-filled geobags 8, and every two layers of sand-filled geobags are backpacked with geogrids. The dynamic load wall and the reinforcement wall have the same height and are ≤190cm;

[0054] The main foundation sand cushion layer is filled between the dynamic load wall 7 and the reinforcement wall 10 to finally form a sand bed 11, which is divided into three sections; the final height is ≤190cm.

[0055] (2) The bullet cans are placed in place

[0056] like Figure 4 As shown, two groups of SPMT vehicles 12 are used to transport bullet cans 6, and the bullet cans 6 are supported by two groups of support seats 13. One group of support seats 13 includes two arc-shaped saddles 14 and two sub-load beams 15. The lower sides of both ends of the saddles are concave square grooves 16, and the sub-load beams 15 are transversely fixed in the square grooves 16. The width of the saddle 14 is less than the height of the lowest point 26 of the arc of the sand bed. The sub-load beams are fixed on the SPMT vehicle 12, and the two ends of the sub-load beams 15 extend out of the two sides of the SPMT vehicle 12. The bullet cans 6 are placed flat on the four arc-shaped saddles 14. The outer periphery of the bullet cans 6 is bounded by flat belts 17 (or multiple steel belts) to ensure safety. The two ends of the flat belts 17 are fixed to the lifting ears of the saddles 14.

[0057] like Figure 5 As shown, a crane is used to place support piers 18 at the gaps, the SPMT vehicle 12 is raised, the bullet tank passes over the dynamic load wall and the reinforcement wall and enters the site, finds the correct direction, the SPMT vehicle 12 lowers the height, and places the two ends of the load-sharing beam 15 on the reserved support piers 18. At this time, the lowest end of the bullet tank 6 is higher than the lowest point 26 of the arc of the sand bed, and the SPMT vehicle 12 withdraws;

[0058] Place multiple 200t jacks 19 under the load-sharing beam 15, and adjust the elevation by the jacks 19 so that the bullet can 6 is placed flat on the sand bed and fits with the main foundation sand cushion 1; Figure 1 As shown;

[0059] Use gas welding and cutting to remove the load-carrying beam 15, the width of the saddle is less than 1m; use a crane to turn the saddle 14 down and place it horizontally and transport it out through a ground ox;

[0060] (3) A retaining wall 20 is built on the enclosure 3. A corbel 21 is provided on the retaining wall 20. A stabilizing wall 22 is formed by placing sandbags on the inner side of the retaining wall. The sandbags are also covered with geogrids. A 500 mm gravel drainage layer 23 is provided below the stabilizing wall.

[0061] (4) Filling sand to cover the bullet tank 6;

[0062] (5) The prefabricated top cover 24 is placed on the corbel 21 to seal the sand bed.

[0063] The geogrid 9 of the present invention is in an S-shape and wraps the sandbag into a whole. Figure 6 As shown, if it is not long enough, the two ends of the geogrid 9 are connected with the previous layer of geogrid returned by connecting rods 27, which increases the dynamic load of the sand bed when the equipment is in place and increases the single-layer bearing capacity of the sand bed.

[0064] On the basis of the original technology, the present invention changes the sand bed type to prevent the flow of sand, prevent the tank from deflecting, and enhance stability; effectively ensure the bearing capacity of the sand bed, enhance stability, prevent lateral stress, and ensure the quality of the sand bed, specifically:

[0065] First, a 700mm main foundation sand cushion layer 4 is laid on the bottom plate, and then a single arc (arc-shaped main foundation sand cushion layer 1) is filled with sand with a thickness of 300mm and back-packed with geogrids to form a stable unit. The sand bed is reinforced with sandbags (from the middle to the inner wall of the retaining wall, they are: dynamic load wall to resist the lateral stress of the tank body, sand bed stability reinforcement wall, and overall stability wall after the tank body is in place). The dynamic load wall to resist the lateral stress of the tank body is a 60° sandbag layer set at a height of 1.9m on both sides of the tank body contour to avoid the sand bed being subjected to a large force at the moment of tank installation, causing the equipment to shift; the sand bed stability reinforcement wall is a sandbag inclined outward with an inclination angle of 75° to ensure the bearing capacity of the sand bed, used for stability reinforcement, and ensure that the sand bed can be safely installed with the tank body; the overall stability wall after the tank body is in place is a 3.5m high sandbag set close to the wall, 90° to the bottom, and after installation, it is used to protect the wall to prevent damage to the tank body due to overall sinking.

[0066] The weight of each sand-filled geotechnical bag 8 and the drainage bag filled with gravel described in the present invention is ≤50kg, and the dimensions of the bag body when flattened are 0.75m in length and 0.55m in width.

[0067] Since the bullet tank is 100 meters long and 7-8 meters in diameter, the saddle 14 carried below is 8 meters long and 2 meters high, and the bullet tank 6 is only 1 meter away from the ground after being laid flat on the sand bed, the sum of the width of the saddle and the height of the ground bull is less than 1 meter. When the time comes, the saddle 14 can be turned down and placed horizontally, and can be transported out by the ground bull; it is simple, convenient and practical.

[0068] When placing the bullet tank, the longitudinal travel of the SPMT vehicle must be considered. The height of the dynamic load wall 7 and the reinforcement wall 10 does not exceed the longitudinal travel of the SPMT vehicle. The SPMT vehicle 12 used in the present invention can rise 1.9m, so the dynamic load wall, reinforcement wall, and sand are the same height and ≤190cm, ensuring that the bullet tank can smoothly reach the top of the designated position.

[0069] The bullet can is laid flat on the sand bed, and after the saddle 14 is taken out, the dynamic load wall 7 is piled up to 3.5 m (radius height of the bullet can) for reinforcement.

[0070] After the bullet tank is installed, the gap is filled, the SPMT vehicle reserves a position to fill sand, and sandbags are piled up. Then, a 500mm gravel layer 23 is set at the bottom of the inner wall of the retaining wall 20. The sandbags are filled with gravel or pebbles for drainage to avoid excessive rain in the rainy season, which will cause buoyancy and affect the quality of the sand bed, causing the tank body to shift and effectively avoid settlement. Then, a stabilizing wall 22 is piled on top. The stabilizing wall is close to the wall to protect the wall and prevent damage to the tank body due to overall sinking.

[0071] In addition, the present invention embeds three vibrating wire earth pressure gauges 28 with a range of 0.2 MPa at both ends of the sand bed 11. Figure 7 As shown, it is used to measure the compressive stress of the soil inside the sand bed over a long period of time, understand the change in soil pressure inside the sand bed, and deal with problems in a timely manner when they are discovered.

[0072] Since the tank is in a chemical plant, some chemicals will float on the tank over time. Adding a concrete top cover 24 can not only prevent water, but also prevent chemicals from penetrating into the sand bed and causing damage to the tank, thereby affecting the service life of the equipment.

[0073] The upper surface of the prefabricated top cover 24 is an outwardly convex arc, and a drainage groove 25 is provided on the side of the corbel outside the top cover 24 to facilitate drainage, so that water will not accumulate on the top cover 24.

[0074] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. Horizontal bullet can ring-wrapped sand filling stabilization process, characterized by: The following steps are involved: (1) Laying the sand bed: (11) First build a reinforced concrete base plate, then build a 50 cm high wall on the outside of the base plate, set up a water stop strip, and leave two gaps in the length direction of the wall; (12) Except for the two gaps, the rest of the ground is paved with a 70cm high main foundation sand cushion. (13) At the location where the bullet cans are placed, lay a circular main foundation sand cushion with a support angle of 120° and a thickness of 30 cm; (14) Along the outer side of the arc-shaped main foundation sand cushion layer, several layers of sand-filled geobags are stacked as dynamic load walls. Every two layers of sand-filled geobags are back-wrapped with geogrids. The length direction of the geogrid is longitudinal, and the outward inclination angle of the dynamic load wall is 60°; (15) A reinforcement wall in the opposite direction is set outside the dynamic load wall, and the inward inclination angle of the reinforcement wall is 75°; the reinforcement wall is composed of several layers of sand-filled geobags, and every two layers of sand-filled geobags are back-wrapped with geogrids. The dynamic load wall and the reinforcement wall have the same height and are ≤190cm; (16) Fill the main foundation sand cushion layer between the dynamic load wall and the reinforcement wall to finally form a sand bed with a final height of ≤190cm; (17) The sand bed is divided into three sections; (2) The bullet cans are placed in place (21) Two groups of SPMT vehicles are used to transport bullet cans, and the bullet cans are supported by two groups of support seats. One group of support seats includes two arc-shaped saddles and two load-carrying beams. The lower sides of the two ends of the saddles are concave square grooves, and the load-carrying beams are transversely fixed in the square grooves. The width of the saddle is less than the height of the lowest point of the arc of the sand bed. The load-carrying beams are fixed on the SPMT vehicles, and the two ends of the load-carrying beams extend out of the two sides of the SPMT vehicles. The bullet cans are placed flat on the four arc-shaped saddles. The outer periphery of the bullet cans is bounded by flat belts, and the two ends of the flat belts are fixed to the lifting ears of the saddles; (22) Use a crane to place piers at the gaps, and the SPMT vehicle is raised. The bullet tank passes over the dynamic load wall and the reinforcement wall and enters the site. After finding the correct direction, the SPMT vehicle lowers the height and places both ends of the load-bearing beam on the reserved piers. At this time, the lowest end of the bullet tank is higher than the bottom of the sand bed, and the SPMT vehicle withdraws. (23) Place a jack under the load-sharing beam and use the jack to adjust the elevation so that the bullet can is placed flat on the sand bed; (24) Use gas welding to remove the load beam, and use a crane to place the saddle horizontally and transport it out through a ground ox; (3) Fill the gap, fill the space reserved by the SPMT truck with sand, pile up sandbags, build a retaining wall on the wall, with corbels on the retaining wall, and place sandbags on the inside of the retaining wall to form a stable wall, which is also back-packed with geogrids. A 500mm gravel drainage layer is set under the stable wall. (4) Fill the bullet can with sand to cover it; (5) The prefabricated top cover is placed on the corbels to seal the sand bed.

2. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: The width of the saddle is less than 1 m.

3. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: The geogrid is connected to the previous layer of geogrid that is returned by a connecting rod.

4. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: The height of the dynamic load wall and the reinforcement wall does not exceed the longitudinal travel of the SPMT vehicle.

5. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: Three vibrating-wire earth pressure gauges are buried at both ends of the sand bed.

6. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: The weight of each geotechnical bag filled with sand and drainage bag filled with gravel is ≤50kg, and the flattened dimensions of the bag are 0.75m in length and 0.55m in width.

7. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: After step (23), the dynamic load wall is piled up to 3.5m.

8. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: The upper surface of the prefabricated top cover is in an outwardly convex arc shape.

9. The horizontal bullet can ring-wrapped sand filling stabilization process according to claim 1 is characterized by: A drainage groove is arranged on the side of the corbel.

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