Deep-buried pipeline in-situ protection subsection reverse construction ultra-deep guide wall underground diaphragm wall and construction method

Abstract

The invention discloses a deeply-buried pipeline in-situ protection subsection reverse construction ultra-deep guide wall underground diaphragm wall and a construction method. The construction method comprises the following construction steps that firstly, a wall section I groove section and a temporary span guide wall groove section are excavated through a grooving machine; 2, reinforcing meshes are bound in the wall section I groove section and the temporary span guide wall groove section, and a lifting type formwork is installed to support and block the reinforcing meshes; thirdly, the wall section I and the temporary span guide wall are poured together to form an integral guide wall; fourthly, the wall section II and the wall section III are constructed in a segmented and reverse mode; fifthly, an underground diaphragm wall groove is excavated, limiting frames are installed on the two sides of the groove so that the reinforcement cage can be in butt joint and put down, and the reinforcement cage is put down into the underground diaphragm wall groove; and sixthly, fixing frames are installed on the two sides of the underground diaphragm wall groove to fix hoppers, and multi-point synchronous pouring of the underground diaphragm wall is conducted through the hoppers. The integral construction efficiency of the diaphragm wall is improved, and the construction risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of diaphragm wall construction technology, specifically to a segmented reverse construction method for deep-buried pipeline in-situ protection of ultra-deep guide walls and construction methods. Background Technology

[0002] As the core structure of deep foundation pit retaining walls, diaphragm walls often face interference from deeply buried pipelines such as water pipes, fiber optic cables, and signal lines when constructed in complex underground environments. Traditional construction methods involve excavating the entire structure and then pouring concrete section by section from bottom to top. This approach is not only time-consuming and inefficient, but also carries extremely high risks during excavation and pouring operations in areas covered by pipelines. Furthermore, soil disturbance can easily lead to pipeline rupture, and high-altitude pouring may result in concrete leakage or structural deformation. To ensure pipeline safety, construction companies must implement corresponding technical measures for support and reinforcement, which significantly restricts the construction efficiency of diaphragm walls in areas with deeply buried pipelines.

[0003] To address the technical challenges of constructing underground pipelines through diaphragm walls, it is urgently necessary to propose a method for constructing ultra-deep diaphragm walls with segmented reverse construction and in-situ protection for deeply buried pipelines. Summary of the Invention

[0004] The purpose of this invention is to provide a method for constructing an ultra-deep guide wall and its construction method for in-situ protection of deeply buried pipelines, which can solve the technical problems of low efficiency and high risk in the construction of underground pipelines penetrating diaphragm walls and achieve better technical and economic benefits when applied to actual engineering projects.

[0005] To address the aforementioned technical challenges, this invention provides a construction method for a segmented reverse-construction ultra-deep guide wall diaphragm wall for in-situ protection of deeply buried pipelines, comprising the following construction steps: Step 1: Use a trenching machine to excavate the wall section I and the adjacent guide wall section; Step 2: Tie steel mesh in the wall section I and the adjacent guide wall section, and install lifting formwork to support the steel mesh; Step 3: Wall segment I and the adjacent guide wall are poured together to form an integral guide wall; Step 4: Construct wall segments II and III in reverse sections; Step 5: Excavate the diaphragm wall trench, install limiting frames on both sides of the trench for connecting and lowering the steel cage, and lower the steel cage into the diaphragm wall trench. Step 6: Install fixing frames on both sides of the diaphragm wall trench to fix the hopper, and use the hopper to perform multi-point synchronous pouring of the diaphragm wall.

[0006] Preferably, in step one, wall segment I and adjacent guide wall trench segment are excavated simultaneously; hydraulic telescopic rods are configured on both sides of the grab bucket of the trenching machine, and the lower end of the hydraulic telescopic rod is connected to a toothed scraper; the end of the scraper away from the toothed tip is rotatably connected to the grab bucket; one end of the hydraulic telescopic rod is rotatably connected to the scraper, and the other end of the hydraulic telescopic rod is rotatably connected to the grab bucket; the angle of the scraper is adjusted by the extension and retraction of the hydraulic telescopic rod.

[0007] Preferably, in step two, the lifting template includes a fixed support, a slider, a guide plate, a side mold, and a lifting beam; the bottom of the fixed support is provided with a leveling base; the upper part of the guide plate is connected to the lifting beam via a connecting rod; sliders are provided at both ends of the lifting beam, and the lifting beam is slidably connected to the fixed support via the sliders; the side of the guide plate is connected to the side mold via a connector; the lifting beam moves up and down along the fixed support via the slider to drive the side mold to move vertically within the groove; an internal support system is provided between the guide plates.

[0008] Preferably, the internal support system includes a first support rod and a second support rod, which are respectively disposed on the guide plates on both sides. The first support rod is inserted into the second support rod, and the two are locked together by a limiting pin. One end of the first support rod is connected to a fixed support on the inner side of one of the guide plates, and one end of the second support rod is connected to a fixed support on the inner side of the other guide plate. The first support rod and the fixed support, as well as the second support rod and the fixed support, are locked together by limiting pins.

[0009] Preferably, in step three, a first pouring space is formed between the side formwork in the guide channel of wall segment I and the side wall of the guide channel of wall segment I, and a second pouring space is formed between the side formwork in the guide channel of the adjacent span guide wall and the side wall of the guide channel of the adjacent span guide wall. Concrete is poured into the first pouring space and the second pouring space. After the concrete in the first pouring space solidifies, wall segment I is formed. After the concrete in the second pouring space solidifies, the adjacent span guide wall is formed. Wall segment I and the adjacent span guide wall are poured together to form an integral guide wall.

[0010] As a preferred option, in step four, after excavating wall section II and wall section III using a trenching machine, the underground pipeline is protected with isolation steel; then, wall section II and wall section III are poured in the same manner as in steps two and three.

[0011] Preferably, in step five, a vertically arranged flexible limiting rod is welded to the middle of the inner side of the limiting frame; the upper end of the reinforcing cage is concave, and the lower end of the reinforcing cage is convex; an outer sleeve is provided at the upper end of the reinforcing cage, and an inner sleeve that mates with the outer sleeve is provided at the lower end of the reinforcing cage; when the upper and lower reinforcing cages are connected, the inner sleeve at the bottom of the upper reinforcing cage is inserted into the outer sleeve at the top of the lower reinforcing cage, and the outer sleeve and the inner sleeve are locked together; the flexible limiting rod limits the movement of the reinforcing cage.

[0012] Preferably, in step six, several positioning slots are opened at the bottom of the fixing frame, and the positioning slots are connected to the vertical guide pipes. The upper end of the guide pipes is connected to the hopper, and the lower end of the guide pipes is the concrete discharge port. Concrete is fed into the hopper by a concrete transport vehicle. The concrete is distributed to each guide pipe through the hopper and simultaneously injected into the diaphragm wall trench through the guide pipes, thereby realizing multi-point synchronous pouring. After the concrete solidifies, the diaphragm wall is formed.

[0013] The deep-buried pipeline in-situ protection segmented reverse construction ultra-deep guide wall diaphragm wall is constructed using the same method as the deep-buried pipeline in-situ protection segmented reverse construction ultra-deep guide wall diaphragm wall.

[0014] The beneficial effects of this invention are as follows: (1) The grab bucket of the trenching machine has been improved. By installing a lateral scraper, the soil excavation in the pipeline coverage area can be met. The angle of the lateral scraper can be reasonably adjusted by the hydraulic telescopic rod to achieve efficient excavation of the soil in the pipeline coverage area.

[0015] (2) The guide wall was constructed by using the segmented reverse construction method, and the construction area was reasonably divided. The excavation and pouring of the guide wall were completed from top to bottom, which solved the construction problem of underground pipelines penetrating the guide wall area.

[0016] (3) Combining the segmented reverse construction method of the guide wall, the lifting formwork moves autonomously to the next wall segment to complete the formwork installation by sliding the slider; at the same time, the inner side of the formwork is horizontally supported by the detachable interlocking internal support, realizing the synchronous operation of the formwork and its support installation, and improving the installation efficiency of the guide wall formwork.

[0017] (4) The sinking of the diaphragm wall steel cage is guided by a limiting frame and a flexible limiting rod. The upper and lower ends of the steel cage are equipped with tongue and groove joints and inner and outer sleeves for precise docking, which improves the sinking and docking accuracy of the steel cage.

[0018] (5) The diaphragm wall is poured using multi-point synchronous pouring technology. The main hopper is supported by a fixed frame, and multiple diversion pipes are laid at the bottom to divert concrete, so as to realize multi-point and directional synchronous pouring of the diaphragm wall. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the guide wall trenching; Figure 2 This is a schematic diagram of an improved grab bucket for a trenching machine; Figure 3 This is a schematic diagram of the segmented reverse construction of the guide wall; Figure 4 This is a schematic diagram of the installation of diaphragm wall formwork; Figure 5 This is a schematic diagram of a lifting formwork structure; Figure 6This is a schematic diagram of the internal support system architecture; Figure 7 This is a schematic diagram of underground pipeline protection. Figure 8 This is a schematic diagram of the steel cage being lowered; Figure 9 This is a schematic diagram of the steel cage limiting frame structure; Figure 10 This is a schematic diagram of the steel cage connection; Figure 11 This is a schematic diagram of the steel cage connection structure; Figure 12 This is a schematic diagram of the diaphragm wall casting process; Figure 13 This is a schematic diagram of hopper positioning and multi-point flow guidance; Figure 14 This is a schematic diagram of a pipeline running through a diaphragm wall.

[0020] In the diagram: 1. Trenching machine; 2. Underground pipeline; 3. Grab bucket; 4. Hydraulic telescopic rod; 5. Tooth tip; 6. Scraper; 7. Temporary guide wall; 8. Wall section I; 9. Wall section II; 10. Wall section III; 11. Rebar mesh; 12. Lifting formwork; 13. Internal support system; 14. Lifting beam; 15. Fixed bracket; 16. Sliding block; 17. Connecting rod; 18. Base; 19. Connector; 20. Guide plate; 21. Side formwork; 22. Fixed support; 23. First support rod; 24. Second support rod; 25. Limiting pin; 26. Guide wall; 27. Isolation steel; 28. Limiting frame; 29. ​​Rebar cage; 30. Flexible limiting rod; 31. Inner sleeve; 32. Outer sleeve; 33. Hopper; 34. Fixed frame; 35. Diversion pipe; 36. Positioning groove; 37. Ground diaphragm wall. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] like Figures 1-14 The present invention provides a construction method for a segmented reverse construction ultra-deep guide wall diaphragm wall for in-situ protection of deeply buried pipelines, comprising the following construction steps: Step 1: Use trenching machine 1 to excavate the wall section I8 and the adjacent guide wall section 7.

[0025] Specifically, wall segment I8 and adjacent guide wall segment 7 are excavated simultaneously; hydraulic telescopic rods 4 are configured on both sides of the grab bucket 3 of the trenching machine 1, and the lower end of the hydraulic telescopic rod 4 is connected to a scraper 6 with toothed tips 5; the end of the scraper 6 away from the toothed tips 5 is rotatably connected to the grab bucket 3; one end of the hydraulic telescopic rod 4 is rotatably connected to the scraper 6, and the other end of the hydraulic telescopic rod 4 is rotatably connected to the grab bucket 3. The angle of the scraper 6 is adjusted by the extension and retraction of the hydraulic telescopic rod 4; the length of the scraper 6 is greater than half the diameter of the underground pipeline 2.

[0026] Step 2: Tie steel mesh 11 in the wall section I8 and the adjacent guide wall section 7, and install lifting formwork 12 to support the steel mesh 11.

[0027] Specifically, the lifting template 12 includes a fixed support 15, a slider 16, a guide plate 20, a side mold 21, and a lifting beam 14; the fixed support 15 has a leveling base 18 at its bottom; the upper part of the guide plate 20 is connected to the lifting beam 14 via a connecting rod 17; both ends of the lifting beam 14 are respectively provided with sliders 16, and the lifting beam 14 is slidably connected to the fixed support 15 via the sliders 16; the side of the guide plate 20 is connected to the side mold 21 via a connector 19; the lifting beam 14 moves up and down along the fixed support 15 via the sliders 18 to drive the side mold 21 to move vertically within the groove section; An inner support system 13 is provided between the guide plates 20. The inner support system 13 includes a first support rod 23 and a second support rod 24. The first support rod 23 and the second support rod 24 are respectively provided on the guide plates 20 on both sides. The first support rod 23 is inserted into the second support rod 24 and the two are locked together by a limiting pin 25. One end of the first support rod 23 is connected to a fixed support 22 on the inner side of one of the guide plates 20, and one end of the second support rod 24 is connected to a fixed support 22 on the inner side of the other guide plate 20. The first support rod 23 and the fixed support 22, and the second support rod 24 and the fixed support 22 are both locked by limiting pins 25.

[0028] Step 3: Wall segment I8 and adjacent guide wall 7 are poured together to form an integral guide wall 26; Specifically, a first pouring space is formed between the side formwork 21 in the guide channel of wall segment I8 and the side wall of the guide channel of wall segment I8, and a second pouring space is formed between the side formwork 21 in the guide channel of adjacent span guide wall 7 and the side wall of the guide channel of adjacent span guide wall 7. Concrete is poured into the first pouring space and the second pouring space. After the concrete in the first pouring space solidifies, wall segment I8 is formed. After the concrete in the second pouring space solidifies, adjacent span guide wall 7 is formed. Wall segment I8 and adjacent span guide wall 7 are poured together to form an integral guide wall 26.

[0029] Step 4: Repeat steps 1 to 3 above to construct wall segments II9 and III10 in reverse order.

[0030] Specifically, the bottom of wall segment II9 is ​​about 0.6m higher than the top of underground pipeline 2; after the trenching machine 1 excavates the trench of wall segment II9 and wall segment III10, the outside of underground pipeline 2 is protected by isolation steel 27; then the pouring construction of wall segment II9 and wall segment III10 is carried out in the same way as in steps two and three.

[0031] Step 5: Excavate the diaphragm wall 37 trench, install the limiting frame 28 on both sides of the trench for connecting and lowering the steel cage 29, and lower the steel cage 29 into the diaphragm wall 37 trench.

[0032] Specifically, a vertically arranged flexible limiting rod 30 is welded to the middle of the inner side of the limiting frame 28; the upper end of the reinforcing cage 29 is concave, and the lower end of the reinforcing cage 29 is convex; an outer sleeve 32 is provided at the upper end of the reinforcing cage 29, and an inner sleeve 31 that cooperates with the outer sleeve 32 is provided at the lower end of the reinforcing cage 29; when the upper and lower reinforcing cages 29 are connected, the inner sleeve 31 at the bottom of the upper reinforcing cage 29 is inserted into the outer sleeve 32 at the top of the lower reinforcing cage 29, and the outer sleeve 32 and the inner sleeve 31 are locked together; the flexible limiting rod 30 limits the reinforcing cage 29.

[0033] Step 6: Install fixing frames 34 on both sides of the trench of the diaphragm wall 37 to fix the hopper 33, and carry out multi-point synchronous pouring of the diaphragm wall 37 through the hopper 33.

[0034] Specifically, the bottom of the fixing frame 34 is provided with several positioning grooves 36, which are connected to the vertical guide pipes 35. The upper end of the guide pipes 35 is connected to the hopper 33, and the lower end of the guide pipes 35 is the concrete discharge port. Concrete is fed into the hopper 33 by a concrete transport vehicle. The concrete is distributed to each guide pipe 35 through the hopper 33 and simultaneously injected into the trench of the diaphragm wall 37 through the guide pipes 35, thereby realizing multi-point synchronous pouring. After the concrete solidifies, the diaphragm wall 37 is formed.

[0035] 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 in-situ protection of deeply buried pipelines, using segmented reverse construction of ultra-deep guide walls and diaphragm walls, characterized in that... The construction steps include the following: Step 1: Use the trenching machine (1) to excavate the wall section I (8) trench and the adjacent guide wall (7) trench; Step 2: Tie steel mesh (11) in the wall section I (8) and the adjacent guide wall (7) and install lifting formwork (12) to support the steel mesh (11); Step 3: Wall segment I (8) and adjacent guide wall (7) are poured together to form an integral guide wall (26); Step 4: Construct wall segment II (9) and wall segment III (10) in reverse segmentation. Step 5: Excavate the trench for the diaphragm wall (37), install the limiting frame (28) on both sides of the trench for the connection and lowering of the steel cage (29), and lower the steel cage (29) into the trench for the diaphragm wall (37); Step 6: Install fixing frames (34) on both sides of the trench of the diaphragm wall (37) to fix the hopper (33) and pour the diaphragm wall (37) at multiple points simultaneously through the hopper (33).

2. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step one, wall segment I (8) and adjacent guide wall (7) trench segment are excavated simultaneously; hydraulic telescopic rods (4) are configured on both sides of the grab bucket (3) of the trenching machine (1), and the lower end of the hydraulic telescopic rod (4) is connected to a scraper (6) with toothed tips (5); the end of the scraper (6) away from the toothed tips (5) is rotatably connected to the grab bucket (3); one end of the hydraulic telescopic rod (4) is rotatably connected to the scraper (6), and the other end of the hydraulic telescopic rod (4) is rotatably connected to the grab bucket (3); the angle of the scraper (6) is adjusted by the extension and retraction of the hydraulic telescopic rod (4).

3. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step two, the lifting template (12) includes a fixed bracket (15), a slider (16), a guide plate (20), a side mold (21), and a lifting beam (14); the bottom of the fixed bracket (15) is provided with a leveling base (18); the upper part of the guide plate (20) is connected to the lifting beam (14) through a connecting rod (17); both ends of the lifting beam (14) are provided with sliders (16), and the lifting beam (14) is slidably connected to the fixed bracket (15) through the sliders (16); the side of the guide plate (20) is connected to the side mold (21) through a connector (19); the lifting beam (14) moves up and down along the fixed bracket (15) through the sliders (18) to drive the side mold (21) to move vertically in the groove; an internal support system (13) is provided between the guide plates (20).

4. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 3, is characterized in that... The internal support system (13) includes a first support rod (23) and a second support rod (24). The first support rod (23) and the second support rod (24) are respectively set on the guide plates (20) on both sides. The first support rod (23) is inserted into the second support rod (24), and the two are locked together by a limiting pin (25). One end of the first support rod (23) is connected to the fixed support (22) inside one of the guide plates (20), and one end of the second support rod (24) is connected to the fixed support (22) inside the other guide plate (20). The first support rod (23) and the fixed support (22) and the second support rod (24) and the fixed support (22) are locked together by the limiting pin (25).

5. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step three, the side formwork (21) in the guide channel of wall segment I (8) forms a first pouring space between the side formwork (21) in the guide channel of wall segment I (8) and the side wall of the guide channel of wall segment I (8). The side formwork (21) in the guide channel of adjacent span guide wall (7) forms a second pouring space between the side formwork (21) in the guide channel of adjacent span guide wall (7) and the side wall of adjacent span guide wall (7). Concrete is poured into the first pouring space and the second pouring space. After the concrete in the first pouring space solidifies, wall segment I (8) is formed. After the concrete in the second pouring space solidifies, adjacent span guide wall (7) is formed. Wall segment I (8) and adjacent span guide wall (7) are poured together to form an integral guide wall (26).

6. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step four, after the trenching machine (1) excavates the trench of wall section II (9) and wall section III (10), the outer side of the underground pipeline (2) is protected by isolation steel (27); then the pouring construction of wall section II (9) and wall section III (10) is carried out in the same way as in steps two and three.

7. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step five, a vertically arranged flexible limiting rod (30) is welded to the middle of the inner side of the limiting frame (28); the upper end of the reinforcing cage (29) is concave and the lower end of the reinforcing cage (29) is convex. The upper end of the reinforcing cage (29) is provided with an outer sleeve (32) and the lower end of the reinforcing cage (29) is provided with an inner sleeve (31) that cooperates with the outer sleeve (32); when the upper and lower reinforcing cages (29) are connected, the inner sleeve (31) at the bottom of the upper reinforcing cage (29) is inserted into the outer sleeve (32) at the top of the lower reinforcing cage (29) and the outer sleeve (32) and the inner sleeve (31) are locked together; the reinforcing cage (29) is limited by the flexible limiting rod (30).

8. The construction method for in-situ protection of deeply buried pipelines, segmented reverse construction of ultra-deep guide walls and diaphragm walls according to claim 1, is characterized in that... In step six, several positioning slots (36) are opened at the bottom of the fixed frame (34). The positioning slots (36) are connected to the vertical guide pipes (35). The upper end of the guide pipes (35) is connected to the hopper (33), and the lower end of the guide pipes (35) is the concrete outlet. Concrete is input into the hopper (33) through a concrete transport vehicle. The concrete is distributed to each guide pipe (35) through the hopper (33) and simultaneously injected into the trench of the diaphragm wall (37) through the guide pipes (35), thereby realizing multi-point synchronous pouring. After the concrete solidifies, the diaphragm wall (37) is formed.

9. A segmented, reverse-construction, ultra-deep guide wall / diaphragm wall for in-situ protection of deeply buried pipelines, characterized in that... The underground continuous wall is constructed using the construction method of segmented reverse construction of deep buried pipeline in-situ protection segmented reverse construction as described in any one of claims 1-8.

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