Fluidized solidified soil backfill deeply-buried underground pipeline and construction method

Abstract

According to the deeply-buried underground pipeline backfilled with the flow-state solidified soil and the construction method, combined supporting of the steel sheet piles, the full-length steel waist beams and the inner supports is adopted, a reliable supporting system which is high in rigidity and small in deformation is provided for a deep narrow groove, the construction safety of a foundation pit is greatly improved, displacement of surrounding soil is effectively controlled, adjacent buildings and pipelines are protected, and the construction period is shortened. Meanwhile, the supporting period can be remarkably shortened through assembly construction; groove foundation pit combined supporting is adopted in the influence range of an existing pipeline, and for a sensitive area adjacent to the existing pipeline, through refined and differentiated supporting combination, the excavation safety of a deep groove is ensured, and meanwhile additional stress and disturbance generated by construction to the existing pipeline are reduced to the maximum extent; the integrated protective shed is adopted to achieve integration and mechanization of backfilling and maintenance procedures, it is ensured that the fluid solidified soil is condensed and hardened under the optimal condition, shrinkage cracks are avoided, the uniformity, the overall strength and the long-term water stability of a backfilling body are guaranteed, and the construction quality and efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of underground engineering and pipeline construction, and in particular to deep-buried underground pipelines backfilled with fluidized solidified soil and construction methods. Background Technology

[0002] In traditional deep-buried underground pipeline construction, especially in densely populated urban areas or under complex geological conditions, a series of technical challenges and safety risks are often encountered. Deep and narrow trench excavation typically employs simple or conventional sheet pile supports, which lack sufficient rigidity and stability, easily leading to pit deformation and surrounding soil displacement, threatening adjacent buildings and underground pipelines. Furthermore, the support installation is inefficient and time-consuming. Pipeline installation often relies on on-site poured concrete bedding or simple supports, resulting in poor positioning accuracy, difficulty in elevation control, a large amount of on-site wet work, low construction efficiency, and difficulty in ensuring quality. When the trench is adjacent to existing pipelines, conventional support methods lack specificity and are difficult to effectively control the additional stress and disturbance to existing pipelines during construction, easily leading to pipeline displacement, leakage, or even rupture accidents. In addition, when fluidized solidified soil is used as backfill material, traditional construction often involves open-air spreading and natural curing, which is prone to drying shrinkage cracks due to uneven moisture evaporation and inadequate curing, resulting in uneven backfill strength, poor integrity, and insufficient water stability, affecting long-term service performance. The aforementioned problems are intertwined, restricting the safety, accuracy, efficiency, and quality of deep-buried pipeline projects. There is an urgent need for a systematic construction method that integrates innovative support, precise installation, protection of adjacent pipelines, and high-quality backfilling and maintenance to comprehensively improve the overall benefits of the project. Summary of the Invention

[0003] The purpose of this invention is to provide a method for backfilling deeply buried underground pipelines with fluidized solidified soil to solve the above-mentioned technical problems.

[0004] To solve the above-mentioned technical problems, the present invention provides a construction method for backfilling deeply buried underground pipelines with fluidized solidified soil, comprising the following steps:

[0005] Step 1: Construction of the combined support structure of steel sheet piles, continuous steel waist beams, and internal bracing: Steel sheet piles are driven at the designed locations in the surrounding soil. After the earthwork is excavated to a certain depth, continuous steel waist beams are connected to the inside of the steel sheet piles. Internal bracing is installed between the two continuous steel waist beams. Then, the excavation of the deep trench continues until the designed depth is reached. Finally, the bottom of the deep trench is replaced with soil. Step 2: Strengthen the construction of support structures in sensitive areas adjacent to existing pipelines; Step 3: Installation of multi-functional prefabricated pipe base plate and pipes: Set bottom waist beams on the steel sheet piles on both sides of the bottom area of ​​the deep trench. Install telescopic trusses symmetrically at intervals on the bottom waist beams on both sides. The ends of the telescopic trusses are connected to the back plates. Adjust the position of the back plates by adjusting the telescopic trusses on both sides. The prefabricated base plate units are hoisted sequentially to the bottom of the deep trench and placed between the back plates on both sides. Adjust the telescopic trusses so that the back plates on both sides clamp the prefabricated base plate units and carry out the pipe connection construction. Step 4: Layered Backfilling of Pipeline and Deep Trench with Fluidized Solidified Soil: After the pipeline construction is completed and passes the water tightness test, an integrated movable protective shed is installed on the upper side of the deep trench. The integrated movable protective shed can be moved by the walking mechanism on both sides of the deep trench. The backfilling of the deep trench is carried out symmetrically in sections and layers, starting from the deepest part and moving to the shallowest part, within the integrated movable protective shed. After the backfilling of the corresponding deep trench within the integrated movable protective shed is completed, the integrated movable protective shed is moved to the next section and the same backfilling and curing construction of the deep trench is carried out until the backfilling construction of the entire deep trench is completed.

[0006] Furthermore, in step one, the inner support is connected to the continuous steel waist beam by a reinforcing support rod, and adjacent inner supports are connected by longitudinal connecting support rods.

[0007] Furthermore, in step two, when the pipeline excavation passes through the intersection of the existing pipeline and the existing pipeline above the pipeline, steel sheet piles are first driven at the intersection, and then cement waterstop piles are driven along the outside of the steel sheet piles, with several steel sheet piles overlapping the edges of the cement waterstop piles and the steel sheet piles.

[0008] Furthermore, in step two, when the pipeline excavation passes through the intersection of the existing pipeline and the existing pipeline below it, cement water-stop piles are first driven at the intersection, and then supporting steel plates are inserted between the steel sheet piles on both sides and the cement water-stop piles for reinforcement.

[0009] Furthermore, the precast base plate unit includes a precast base plate, with several lifting lugs spaced apart on both sides of the precast base plate. A pipe arc-shaped limiting groove is located in the middle of the precast base plate and between the two lifting lugs. Several pipe fixing buckles are arranged on both sides of the pipe arc-shaped limiting groove. The two ends of the pipe flexible fixing rope are respectively fastened to the pipe fixing buckles so that when the pipe is placed in the pipe arc-shaped limiting groove, the pipe is limited by the pipe flexible fixing rope.

[0010] Furthermore, in step three, a post-cast strip is reserved between adjacent precast base plate units. A steel mesh is hoisted at the reserved post-cast strip and micro-expansion concrete is poured. After the post-cast strip reaches the design strength, the pipes are hoisted into the pipe arc-shaped limiting groove in sequence, and then the pipe connection construction is carried out.

[0011] Furthermore, in step four, the backfilling and pouring of the first layer of fluidized solidified soil and the second layer of fluidized solidified soil are carried out in sequence. When the backfilling and pouring of the second layer of fluidized solidified soil is about to be completed, the support structure consisting of the continuous steel waist beam and the internal support within the length of the mobile integrated protective shed is gradually dismantled. Then, the backfilling and pouring of the third and fourth layers of fluidized solidified soil are carried out.

[0012] Furthermore, several retractable sprinkler systems are installed on the integrated mobile protective shed. After the water is sprayed by the retractable sprinkler systems to maintain a certain level of curing intensity, the integrated mobile protective shed is moved to the next location.

[0013] This invention also discloses a deep-buried underground pipeline backfilled with fluidized solidified soil, which is constructed according to the construction method of deep-buried underground pipeline backfilled with fluidized solidified soil.

[0014] The beneficial effects of this invention are as follows: 1. This invention adopts a combination of steel sheet piles, continuous steel waist beams, and internal supports, providing a reliable support system with high rigidity and low deformation for deep and narrow trenches. This greatly improves the safety of foundation pit construction, effectively controls the displacement of surrounding soil, and protects adjacent buildings and pipelines. At the same time, its modular construction can significantly shorten the support cycle.

[0015] 2. This invention adopts a combination of trench and foundation pit support within the influence range of existing pipelines. For sensitive areas adjacent to existing pipelines, through refined and differentiated support combinations, it ensures the safety of deep trench excavation while minimizing the additional stress and disturbance to existing pipelines caused by construction, thus achieving safe and precise parallel construction.

[0016] 3. This invention adopts a multi-functional prefabricated assembled pipe base plate, which uses a high-precision reinforced concrete base plate prefabricated in the factory and can be quickly assembled on site. This achieves accurate pipe positioning and consistent elevation. The base plate has built-in pipe slots, drainage ditches and other functions, which greatly improves installation efficiency and quality, reduces on-site wet work, and is conducive to civilized construction and schedule control.

[0017] 4. This invention adopts a mobile spray curing integrated protective shed for layered backfilling of fluidized solidified soil. The integrated protective shed realizes the integration and mechanization of backfilling and curing processes, ensuring that the fluidized solidified soil solidifies and hardens under optimal conditions, avoiding drying shrinkage cracks, ensuring the uniformity, overall strength and long-term water stability of the backfill, and greatly improving construction quality and efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a combined support structure consisting of sheet piles, continuous steel girders, and internal bracing. Figure 2 This is a schematic diagram of the protective plan above the pipeline to be constructed, showing the existing pipelines. Figure 3 This is a schematic diagram of the protective plan for existing pipelines beneath the pipeline to be constructed. Figure 4 This is a schematic diagram of a multi-functional prefabricated assembled pipe base plate structure; Figure 5 This is a schematic diagram of a multi-functional prefabricated assembled pipe base plate pipe installation structure; Figure 6 This is a schematic diagram of the connection structure of a multi-functional prefabricated assembled pipe base plate; Figure 7 This is a cross-sectional view of the pipe installation on a multi-functional prefabricated assembled pipe base plate; Figure 8 This is a schematic diagram of the layered backfill structure of the first and second layers of fluidized solidified soil in the mobile spray curing integrated protective shed; Figure 9 This is a schematic diagram of the dismantling of the continuous steel waist beam + internal support structure; Figure 10 This is a schematic diagram of the layered backfill structure of the third and fourth layers of fluidized solidified soil in the mobile spray curing integrated protective shed.

[0019] In the diagram: 1. Deep trench; 2. Sheet piles; 3. Surrounding soil; 4. Continuous steel waist beam; 5. Internal support; 6. Reinforcing support rod; 7. Longitudinal connecting support rod; 8. Backfill soil at the bottom of the trench; 9. Existing pipeline above the main pipeline; 10. Cement waterstop pile; 11. Existing pipeline below the main pipeline; 12. Supporting steel plate; 13. Precast base plate unit; 14. Lifting lug; 15. Pipeline arc-shaped limiting groove; 16. Pipeline fixing buckle; 17. Flexible pipe fixing... 18. Fixed rope; 19. Pipeline; 20. Post-cast strip of base slab; 21. Steel mesh; 22. Micro-expansion concrete; 23. Bottom waist beam; 24. Telescopic truss; 25. Back plate; 26. Precast base slab; 27. Walking mechanism; 28. Integrated movable protective shed; 29. ​​Telescopic sprinkler mechanism; 30. First layer of fluidized solidified soil; 31. Second layer of fluidized solidified soil; 32. Third layer of fluidized solidified soil; 33. Fourth layer of fluidized solidified soil. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] like Figures 1-10 The present invention provides a construction method for backfilling deeply buried underground pipelines with fluidized solidified soil, comprising the following steps: Step 1: Construction of the combined support structure of sheet pile 2, continuous steel waist beam 4, and internal support 5: Install sheet pile 2 at the designed location in the surrounding soil 3, and then excavate the earthwork to a certain depth. Weld continuous steel waist beam 4 inside the sheet pile 2, and install internal support 5 between the two continuous steel waist beams 4. The internal support 5 and the continuous steel waist beam 4 are reinforced and connected by reinforcing support rod 6. Adjacent internal supports 5 are reinforced and connected by longitudinal connecting support rod 7. Then continue the excavation of deep trench 1 until the designed depth is reached. Then, carry out the bottom backfill soil 8 construction at the bottom of deep trench 1.

[0024] Step 2: For sensitive areas adjacent to existing pipelines, strengthen the construction of the support structure: When the pipeline 18 is excavated through the intersection of the existing pipeline and the existing pipeline 9 above it, first drive steel sheet piles 2 at the intersection, and then drive cement waterstop piles 10 along the outside of the steel sheet piles 2, with 4 to 5 steel sheet piles 2 overlapping the edge of the cement waterstop piles 10 and the steel sheet piles 2; when the pipeline 18 is excavated through the intersection of the existing pipeline and the existing pipeline 11 below it, first drive cement waterstop piles 10 at the intersection, and then insert supporting steel plates 12 between the steel sheet piles 2 on both sides and the cement waterstop piles 10 for reinforcement support.

[0025] Step 3: Installation of the multi-functional prefabricated pipe base plate and pipes: The prefabricated base plate unit 13 includes a prefabricated base plate 25, lifting lugs 14, pipe arc-shaped limiting grooves 15, pipe fixing clips 16, and pipe flexible fixing ropes 17. Bottom waist beams 22 are welded to the steel sheet piles 2 on both sides of the bottom area of ​​the deep trench 1. Telescopic trusses 23 are symmetrically installed at certain intervals on the bottom waist beams 22 on both sides. The ends of the telescopic trusses 23 are connected to the back plate 24. The position of the back plate 24 is adjusted by the telescopic trusses 23 on both sides. The prefabricated base plate unit 13 is then lifted sequentially by the lifting lugs 14. The precast base plate unit 13 is hoisted to the bottom of the deep trench 1 and placed between the two back plates 24. The telescopic truss 23 is adjusted so that the two back plates 24 clamp the precast base plate unit 13. A post-cast strip 19 is reserved between adjacent precast base plate units 13. The pre-installed steel mesh 20 is hoisted at the reserved post-cast strip 19. After checking that it is correct, micro-expansion concrete 21 with a strength grade one higher than that of the precast base plate unit 13 is poured. After the post-cast strip 19 of the base plate reaches the design strength, the pipe 18 is hoisted into the pipe arc-shaped limiting groove 15 in sequence, and the connection construction of the pipe 18 is carried out.

[0026] The precast base plate 25 is provided with several lifting lugs 14 at intervals on both sides. The pipe arc-shaped limiting groove 15 is located in the middle of the precast base plate 25 and between the two lifting lugs 14. Several pipe fixing buckles 16 are provided on both sides of the pipe arc-shaped limiting groove 15. The two ends of the pipe flexible fixing rope 17 are respectively fastened to the pipe fixing buckles 16 so that when the pipe 18 is placed in the pipe arc-shaped limiting groove 15, the pipe 18 is limited by the pipe flexible fixing rope 17.

[0027] In one embodiment of this solution, the telescopic truss 23 can be adjusted in total length by hydraulic system control or by internal and external pipe thread engagement, so as to clamp the prefabricated base plate unit 13 through the back plate 24.

[0028] Step 4: Layered Backfilling of Pipeline 18 and Deep Trench 1 with Fluidized Solidified Soil: After the pipeline 18 is completed and passes the water tightness test, an integrated movable protective shed 27 is installed on the upper side of the deep trench 1. The integrated movable protective shed 27 can be moved by the walking mechanism 26 on both sides of the deep trench 1. Several retractable sprinkler mechanisms 28 are installed on the integrated movable protective shed 27. The backfilling of the deep trench 1 is carried out symmetrically according to the principle of deep to shallow and segmented layering within the integrated movable protective shed 27. The backfilling and pouring of the first layer of fluidized solidified soil 29 and the second layer of fluidized solidified soil 30 are carried out in sequence. When the backfilling and pouring of the second layer of fluidized solidified soil 30 is nearing completion, the support structure consisting of the continuous steel waist beam 4 and the internal support 5 within the length of the mobile integrated protective shed 27 is gradually dismantled. Then, the backfilling and pouring of the third layer of fluidized solidified soil 31 and the fourth layer of fluidized solidified soil 32 are carried out. After the backfilling and pouring of this length of the deep trench 1 within the mobile integrated protective shed 27 is completed, and after water curing to a certain strength is achieved through the retractable sprinkler system 28, the mobile integrated protective shed 27 is moved to the next section, and the same backfilling, pouring, and curing construction of the deep trench 1 is carried out until the backfilling and pouring of the entire deep trench 1 is completed. It should be noted that if the deep trench 1 is deep enough, the backfilling and pouring construction of several layers of fluidized solidified soil can be divided according to the above principle.

[0029] The walking mechanism 26 includes several rollers connected to the bottom of the integrated movable protective shed 27, and the retractable sprinkler mechanism 28 can be a telescopic pipe or a corrugated pipe with a hollow tubular structure. This invention also discloses a method for backfilling deeply buried underground pipelines with fluidized solidified soil, including as follows: Figure 1 As shown, steel sheet piles 2 are driven at the designed location in the surrounding soil 3. After the earthwork is excavated to a certain depth, a continuous steel waist beam 4 is welded inside the steel sheet piles 2. An inner support 5 is installed between the two continuous steel waist beams 4. The inner support 5 and the continuous steel waist beam 4 are reinforced and connected by a reinforcing support rod 6. Adjacent inner supports 5 are reinforced and connected by a longitudinal connecting support rod 7. Then, the excavation of the deep trench 1 continues until the designed depth is reached. Then, the bottom of the deep trench 1 is filled with soil replacement soil 8.

[0030] like Figure 2 , 3 As shown, for sensitive areas adjacent to existing pipelines, when pipeline 18 is excavated through the intersection of the existing pipeline and the upper part of the existing pipeline 9, steel sheet piles 2 are first driven, and then cement waterstop piles 10 are driven along the outside of the steel sheet piles 2, with 4 to 5 steel sheet piles 2 overlapping the edge of the cement waterstop piles 10 and the steel sheet piles 2; when pipeline 18 is excavated through the intersection of the existing pipeline and the lower part of the existing pipeline 11, cement waterstop piles 10 are first driven, and then supporting steel plates 12 are inserted between the steel sheet piles 2 on both sides and the cement waterstop piles 10 for reinforcement.

[0031] like Figure 4 , 5 As shown in Figure 6, the precast base plate unit 13 consists of a precast base plate 25, lifting lugs 14, pipe arc-shaped limiting grooves 15, pipe fixing buckles 16, and pipe flexible fixing ropes 17. Bottom waist beams 22 are welded to the steel sheet piles 2 on both sides of the bottom area of ​​the deep trench 1. Telescopic trusses 23 are symmetrically installed on the bottom waist beams 22 at certain intervals on both sides. The telescopic trusses 23 are connected to the back plate 24. The position of the back plate 24 is adjusted by the telescopic trusses 23 on both sides, and the precast base plate unit 13 is hoisted to the bottom of the deep trench 1 in sequence by the lifting lugs 14. Between the back plates 24 on both sides of the bottom backfill soil 8, the telescopic truss 23 is adjusted so that the back plates 24 on both sides clamp the precast bottom plate unit 13. A post-cast strip 19 is reserved between adjacent precast bottom plate units 13. The pre-installed steel mesh 20 is hoisted at the reserved post-cast strip 19. After checking that it is correct, micro-expansion concrete 21 with a strength grade one higher than that of the precast bottom plate unit 13 is poured. After the post-cast strip 19 of the bottom plate reaches the design strength, the pipe 18 is hoisted into the pipe arc-shaped limiting groove 15 in sequence, and the connection construction of the pipe 18 is carried out.

[0032] like Figure 8 , 9 As shown in Figure 10, after the pipeline 18 is completed and passes the water tightness test, an integrated movable protective shed 27 is installed on the upper side of the deep trench 1. The integrated movable protective shed 27 can be moved by the walking mechanism 26 on both sides of the deep trench 1. Several retractable sprinkler mechanisms 28 are installed on the integrated movable protective shed 27. The backfilling of the deep trench 1 is carried out symmetrically according to the principle of deep to shallow and segmented layering within the integrated movable protective shed. The backfilling and pouring of the first layer of fluidized solidified soil 29 and the second layer of fluidized solidified soil 30 are carried out in sequence. When the backfilling and pouring of section 0 is nearing completion, gradually dismantle the continuous steel waist beam 4 + internal support 5 support structure within the length of the mobile integrated protective shed 27. Then, carry out the backfilling and pouring of the third layer of fluidized solidified soil 31 and the fourth layer of fluidized solidified soil 32. After the backfilling and pouring of this section of the deep trench 1 within the mobile integrated protective shed is completed, and after water curing to a certain strength by the retractable sprinkler system 28, move the mobile integrated protective shed 27 to the next section and carry out the same backfilling, pouring, and curing construction of the deep trench 1 until the backfilling and pouring of the entire deep trench 1 is completed. It should be noted that if the deep trench 1 is deep enough, the backfilling and pouring construction of several layers of fluidized solidified soil can be divided according to the above principle.

[0033] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A construction method for backfilling deeply buried underground pipelines with fluidized solidified soil, characterized in that, Includes the following steps: Step 1: Construction of the combined support structure of sheet pile (2) - continuous steel waist beam (4) - internal support (5): Install sheet pile (2) at the design position of the surrounding soil (3), and then excavate the earthwork to a certain depth. Connect the continuous steel waist beam (4) to the inside of the sheet pile (2), install the internal support (5) between the two continuous steel waist beams (4), and then continue the excavation of the deep trench (1) until the design depth is reached. Then carry out the bottom replacement soil (8) construction of the deep trench (1). Step 2: Strengthen the construction of support structures in sensitive areas adjacent to existing pipelines; Step 3: Installation of multi-functional prefabricated pipe base plate and pipe: Set bottom waist beams (22) on the steel sheet piles (2) on both sides of the bottom area of ​​the deep trench (1). Install telescopic trusses (23) symmetrically on the bottom waist beams (22) on both sides. Connect the back plate (24) at the end of the telescopic truss (23). Adjust the position of the back plate (24) by adjusting the telescopic trusses (23) on both sides. Hoist the prefabricated base plate unit (13) to the bottom of the deep trench (1) and place it between the back plates (24) on both sides. Adjust the telescopic truss (23) so that the back plates (24) on both sides clamp the prefabricated base plate unit (13) and carry out the connection construction of the pipe (18). Step 4: Layered backfilling construction of pipeline (18) and deep trench (1) with solidified soil: After the pipeline (18) is completed and passes the water tightness test, an integrated movable protective shed (27) is installed on the upper side of the deep trench (1). The integrated movable protective shed (27) can be moved by the walking mechanism (26) on both sides of the deep trench (1). The backfilling of the deep trench (1) is carried out in a symmetrical manner in the integrated movable protective shed (27) with the deep section first and then the shallow section. After the backfilling of the corresponding deep trench (1) in the integrated movable protective shed (27) is completed, the integrated movable protective shed (27) is moved to the next section and the same form of backfilling and curing construction of the deep trench (1) is carried out until the backfilling construction of the entire deep trench (1) is completed.

2. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: In step one, the inner support (5) is connected to the continuous steel waist beam (4) by a reinforcing support rod (6), and adjacent inner supports (5) are connected by a longitudinal connecting support rod (7).

3. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: In step two, when the pipeline (18) is excavated through the intersection of the existing pipeline and the existing pipeline (9) above the pipeline, steel sheet piles (2) are first driven at the intersection, and then cement waterstop piles (10) are driven along the outside of the steel sheet piles (2), and several steel sheet piles (2) overlap with the edge of the cement waterstop piles (10) and the steel sheet piles (2).

4. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: In step two, when the pipeline (18) is excavated through the intersection of the existing pipeline and the existing pipeline (11) below the pipeline, cement water-stop piles (10) are first driven at the intersection, and then supporting steel plates (12) are driven between the steel sheet piles (2) on both sides and the cement water-stop piles (10) for reinforcement.

5. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: The precast base plate unit (13) includes a precast base plate (25). Several lifting lugs (14) are arranged at intervals on both sides of the precast base plate (25). The pipe arc-shaped limiting groove (15) is located in the middle of the precast base plate (25) and between the two lifting lugs (14). Several pipe fixing buckles (16) are arranged on both sides of the pipe arc-shaped limiting groove (15). The two ends of the pipe flexible fixing rope (17) are respectively fastened to the pipe fixing buckles (16) so that when the pipe (18) is placed in the pipe arc-shaped limiting groove (15), the pipe (18) is limited by the pipe flexible fixing rope (17).

6. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 5, characterized in that: In step three, a post-cast strip (19) is reserved between adjacent precast base plate units (13). A steel mesh (20) is hoisted at the reserved post-cast strip (19) and micro-expansion concrete (21) is poured. After the post-cast strip (19) reaches the design strength, the pipe (18) is hoisted into the pipe arc-shaped limiting groove (15) in sequence, and then the connection construction of the pipe (18) is carried out.

7. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: In step four, the backfilling and pouring of the first layer of fluidized solidified soil (29) and the second layer of fluidized solidified soil (30) are carried out in sequence. When the backfilling and pouring of the second layer of fluidized solidified soil (30) is about to be completed, the support structure consisting of the continuous steel waist beam (4) and the internal support (5) within the length of the mobile integrated movable protective shed (27) is gradually dismantled. Then, the backfilling and pouring of the third layer of fluidized solidified soil (31) and the fourth layer of fluidized solidified soil (32) are carried out.

8. The construction method for backfilling deeply buried underground pipelines with fluidized solidified soil according to claim 1, characterized in that: Several retractable sprinkler mechanisms (28) are installed on the integrated mobile protective shed (27). After the retractable sprinkler mechanism (28) sprays water to maintain the shed to a certain strength, the integrated mobile protective shed (27) is moved to the next position.

9. A method for backfilling deeply buried underground pipelines with fluidized solidified soil, characterized in that: The method for backfilling deeply buried underground pipelines with fluidized solidified soil according to any one of claims 1-8 is used to obtain the pipeline.

Images