Deep-buried waste flexible pipeline underground diaphragm wall and construction method thereof

Abstract

The invention relates to the technical field of underground diaphragm wall construction, and discloses a deeply-buried waste flexible pipeline underground diaphragm wall and a construction method thereof.The deeply-buried waste flexible pipeline underground diaphragm wall comprises a rotary excavating drilling tool for removing deeply-buried waste flexible cables, spiral blades for cutting soil are arranged on the periphery of a drilling rod, and the bottom of the drilling rod is connected with a spiral baffle through a fixed baffle; according to the waste pipeline plugging system, a telescopic rod and a C-shaped rod are hinged, the angle adjusting range is 60-150 degrees, a vertical rod is arranged at the end of the C-shaped rod, and a pipeline plugging air bag is filled with flow-state solidified soil after being inflated and plugged; the sliding type reinforcement cage shelving steel plate assembly is characterized in that pulleys are arranged at the bottom of a shelving steel plate, a handle is arranged at the top of the shelving steel plate, limiting holes are formed in guide walls on the same side, traction rings are arranged at the ends of the other side, and baffles are arranged above the two sides. By means of the pipeline plugging device, the waste pipeline with the large plugging burial depth can be rapidly removed, excavation construction is avoided, the pipeline plugging leakproofness is improved, the labor intensity of workers is reduced, the steel plate placing positioning accuracy and the operation convenience are improved, and the construction safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground continuous wall construction, in particular to an underground continuous wall for deeply buried abandoned flexible pipelines and a construction method thereof. Background Art

[0002] Underground continuous wall is a commonly used foundation pit retaining structure in urban underground projects. However, with the continuous development of the urban economy, the construction area of underground continuous wall inevitably needs to cross existing pipelines. After the relocation of the original pipeline, the remaining flexible pipelines such as water pipes and cables in the pipeline need to be excavated and removed, and the abandoned pipelines also need to be blocked to prevent leakage during the construction of the underground continuous wall. The open excavation and blocking process not only requires a long construction period, but also has high requirements on the site size. In particular, it will incur expensive construction costs for pipelines with a large burial depth. At the same time, during the lowering of the underground continuous wall steel cage, the steel cage needs to be temporarily placed on the supporting steel plate of the guide wall when the wire rope is replaced. In order to ensure the strength of the supporting steel plate, it is generally heavy. For underground continuous walls with a larger width, the efficiency of manual handling is low, and there is a risk of falling during the placement process. Therefore, an underground continuous wall for deeply buried abandoned flexible pipelines and a construction method thereof are proposed. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides an underground continuous wall for deeply buried abandoned flexible pipes and a construction method thereof.

[0004] The present invention is implemented by the following technical solution: a construction method of an underground continuous wall for deeply buried abandoned flexible pipelines, comprising the following steps:

[0005] S1. Use a total station to locate and determine the elevation of the underground continuous wall slot;

[0006] S2. Build a construction platform, excavate a guide groove, and construct a guide wall with limited holes;

[0007] S3. The rotary drilling rig is in place, and the fixed baffle and spiral baffle are installed on the drill rod. After adjusting the vertical angle, the drill is drilled to 30 cm above the bottom elevation of the abandoned pipe. The drill is rotated in the reverse direction to lift the drill tool to remove the abandoned flexible cable.

[0008] S4. Place the pipe-sealing airbag into the abandoned pipe using the telescopic rod and C-shaped rod, inflate and seal it, and then fill it with fluidized solidified soil;

[0009] S5. Use a hydraulic slotting machine with three grips to form the slots, and temporarily fix the steel cage by sliding a steel plate when lowering it;

[0010] S6. Construction is completed by pouring concrete using the conduit method.

[0011] Furthermore, the rotary drilling tool for removing the discarded flexible cable includes:

[0012] The drill rod is equipped with spiral blades and a guide drill bit around it, and a shotcrete pipe inside;

[0013] The bottom of the spiral blade is connected to the spiral baffle through a fixed baffle, and the distance between the two can be adjusted to adapt to different cable diameters.

[0014] Furthermore, the gap between the spiral baffle and the spiral blade is used to discharge the crushed soil, and the waste flexible cable is collected in the space formed by the spiral baffle and the fixed baffle during reverse rotation.

[0015] Furthermore, the abandoned pipeline blocking system includes:

[0016] Both ends of the pipe sealing airbag are equipped with airbag lifting rings and air supply holes, which are connected to the air compressor through the air supply pipe;

[0017] The C-shaped rod is inserted into the airbag lifting ring through the vertical rod to connect the airbag and is hinged to the end of the telescopic rod. The hinge angle range is 60° to 150°.

[0018] Furthermore, the length of the telescopic rod is adjusted by a locking ring, and is suitable for blocking abandoned pipes at different buried depths.

[0019] Furthermore, the sliding steel cage shelving steel plate assembly includes:

[0020] There is a pulley at the bottom of the shelving steel plate, a handle at the top and a traction ring at the end;

[0021] The guide wall is provided with a limit hole and a baffle, and the height of the limit hole is greater than the height of the pulley to bear the weight and place the steel plate.

[0022] Furthermore, the baffle is fixed to both sides of the guide wall by baffle fixing rods to prevent the placed steel plates from falling.

[0023] Furthermore, the fluidized solidified soil is filled in the gaps in the pipeline after being blocked by the airbag, and its strength does not affect the efficiency of trench excavation and prevents leakage of slurry.

[0024] Furthermore, the shelved steel plate is moved to the limiting hole for positioning through the traction ring and the pulley, and the handle assists in recovery.

[0025] An underground continuous wall for deeply buried abandoned flexible pipes is constructed using the above-mentioned construction method, comprising:

[0026] Abandoned pipe areas removed by rotary drilling tools;

[0027] Pipeline gaps are double-sealed with air bags and fluidized solidified soil;

[0028] A steel cage precisely positioned by sliding shelving steel plates and a cast underground continuous wall.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention adopts a rotary drilling tool to crush and remove discarded flexible cables, thereby avoiding the increase in construction costs and delays in construction period caused by excavation construction. It is particularly suitable for removing abandoned pipelines with a large burial depth. While cutting and crushing the discarded flexible cables, they are collected and removed at the same time, preventing the cables from remaining in the trench section and causing the construction quality of the underground continuous wall to be reduced.

[0031] 2. The abandoned pipe sealing system adopted by the present invention is suitable for sealing abandoned pipes at different buried depths, is convenient for workers to operate, and improves construction efficiency. At the same time, the combination of pipe sealing airbags and fluidized solidified soil improves the airtightness of pipe sealing and avoids the occurrence of slurry leakage.

[0032] 3. The present invention adopts a sliding steel cage to place the steel plate assembly, which reduces the labor intensity of the staff, improves the positioning accuracy of the placed steel plates and the convenience of operation, can effectively prevent the placed steel plates from falling due to human operation errors, and improves construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a rotary drilling tool for removing deeply buried discarded flexible cables provided by the present invention;

[0034] Figure 2 A schematic cross-sectional view of an underground continuous wall project for deeply buried abandoned flexible pipelines provided by the present invention;

[0035] Figure 3 A schematic structural diagram of the abandoned pipeline blocking system provided by the present invention;

[0036] Figure 4 A schematic diagram of a partial top view of the abandoned pipe blocking system provided by the present invention;

[0037] Figure 5 A schematic structural diagram of a sliding steel cage resting on a steel plate assembly provided by the present invention;

[0038] Figure 6 This is a partial top view structural schematic diagram of the sliding steel cage resting on the steel plate assembly provided by the present invention.

[0039] Description of main symbols:

[0040] 1. Drill rod; 2. Spiral blade; 3. Spiral baffle; 4. Fixed baffle; 5. Drill bit; 6. Shotcrete pipe; 7. Underground continuous wall; 8. Abandoned pipeline; 9. Abandoned flexible cable; 10. Pipe sealing airbag; 11. Telescopic rod; 12. Locking ring; 13. Articulated joint; 14. Gas pipe; 15. Airbag lifting ring; 16. Gas hole; 17. Shelving steel plate; 18. Baffle; 19. Handle; 20. Pulley; 21. Baffle fixing rod; 22. Guide wall; 23. Air compressor; 24. Steel cage; 25. Flow solidified soil; 26. Traction ring; 27. Limit hole; 28. C-rod. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0042] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting this application.

[0043] Example 1:

[0044] Please combine Figure 1 The rotary drilling tool for removing deeply buried abandoned flexible cables in this embodiment includes a drill rod 1 for connecting to a rotary drilling rig, a spiral blade 2 for cutting soil is arranged around the drill rod 1, a guide drill bit 5 is arranged at the bottom, and a grouting pipe 6 for transporting and spraying mud is arranged inside, and the bottom of the spiral blade 2 is connected to the spiral baffle 3 through a fixed baffle 4.

[0045] Working principle:

[0046] After the rotary drilling rig is in place, a fixed baffle 4 and a spiral baffle 3 are installed on the drill rod 1 with the spiral blade 2 and the drill bit 5, the vertical angle between the drill rod and the ground is checked and adjusted, and the rotary drilling rig is started. The drill bit 5 and the spiral blade 2 rotate to cut the soil and sink it. When drilling to the position of the abandoned pipe 8 and the abandoned flexible cable 9, the spiral blade 2 cuts and crushes them. After continuing to drill to a height of -30 cm above the bottom elevation of the abandoned pipe, the drill tool is rotated in the opposite direction to be lifted. Since the width of the spiral baffle 3 and the distance from the upper and lower ends of the spiral blade 2 can be adjusted according to the diameter of the abandoned flexible cable, the abandoned flexible cable 9 enters the space between the spiral baffle 3 and the spiral blade 2, and the crushed soil is discharged from the gap between the two, and the crushing and cleaning of the abandoned flexible cable 9 is completed without affecting the drilling efficiency.

[0047] Example 2:

[0048] Please combine Figure 2-Figure 5 The abandoned pipeline blocking system includes a cylindrical pipeline blocking airbag 10, and force-bearing airbag hanging rings 15 are set on both sides of the end of the pipeline blocking airbag 10. An air supply hole 16 is set in the middle. The air supply hole 16 is connected to the air compressor 23 through the air supply pipe 14. The C-shaped rod 28 is connected to the pipeline blocking airbag 10 through the airbag hanging ring 15 and is connected to the telescopic rod 11 through the hinge joint 13. The length of the telescopic rod 11 is adjusted by the locking ring 12.

[0049] Working principle:

[0050] After completing the removal of the deeply buried abandoned flexible cables, one end of the air pipe 14 is connected to the air hole 16 of the pipeline blocking airbag 10, and the other end of the air pipe 14 is connected to the air compressor 23. The air compressor 23 is placed on the guide wall 22 and fixed.

[0051] Insert the vertical rod at the end of the C-shaped rod 28 upward into the airbag lifting ring 15 and connect it to the pipe sealing airbag 10. Adjust the length of the telescopic rod 11 according to the buried depth of the abandoned pipe 8 and lock it with the locking ring 12. The hinge joint 13 at the end of the telescopic rod 11 is connected to the C-shaped rod 28. The hinge angle adjustment range is 60° to 150°, which is convenient for construction workers to place the pipe sealing airbag on the ground.

[0052] The pipe-sealing airbag 10 is placed in the abandoned pipe 8 through the telescopic rod 11 and the C-shaped rod 28. The air compressor 23 is turned on to inflate the pipe-sealing airbag 10. After reaching the specified pressure (e.g., 0.3-0.5 MPa), the C-shaped rod 28 is pressed down to separate the end vertical rod from the airbag hanging ring 15. The air pipe 14 is unplugged through the C-shaped rod 28, and the telescopic rod 11, C-shaped rod 28 and air pipe 14 are recovered. Finally, fluidized solidified soil 25 (e.g., a mixture of cement, fly ash, sand and water in a mass ratio of 1:2:3:1.5, with a 24-hour compressive strength of 0.5-1.0 MPa) is poured into the hole until it exceeds the top elevation of the abandoned pipe 8 by 50 cm, completing the sealing operation.

[0053] Example 3:

[0054] Please combine Figure 5-Figure 6 The sliding steel cage shelving steel plate assembly includes a shelving steel plate 17 with a pulley 20 at the bottom of one side, a handle 19 at the top of the same side of the shelving steel plate 17, a limiting hole 27 on the guide wall 22 on the same side, and a traction ring 26 at the end of the shelving steel plate 17 on the other side. Baffles 18 are provided above both sides of the shelving steel plate 17, and the baffles 18 are buried in the guide wall 22 through baffle fixing rods 21. When replacing the steel wire rope for hoisting the steel cage 24 or fixing the steel cage 24, the steel cage 24 is placed on the shelving steel plate 17.

[0055] Working principle:

[0056] When the steel cage 24 is hoisted to a certain depth and the wire rope lifting point needs to be replaced or the steel cage 24 is finally fixed, the steel cage 24 needs to be placed on the supporting steel plate 17 to avoid safety risks such as deformation, disintegration and sudden sinking of the steel cage 24.

[0057] When placing the shelf steel plate 17, tie the rope to the traction ring 26, and pull the rope on the other side of the guide wall 22 to drag the shelf steel plate 17, driving the pulley 20 at the bottom of the shelf steel plate 17 to move on the guide wall 22, which greatly reduces the labor intensity. When the pulley 20 moves to the limiting hole 27, since the height of the limiting hole 27 is greater than the height of the pulley 20, the bottom surface of the shelf steel plate 17 is directly located on the guide wall 22, avoiding the pulley bearing weight and improving the overall stability. The right side of the pulley 20 contacts the right side of the limiting hole 27, and the traction rope is stopped, thereby realizing the accurate positioning and placement of the shelf steel plate 17.

[0058] When recovering the shelved steel plate 17, pull the rope on the side of the guide wall 22 with the limiting hole 27, and at the same time drag the shelved steel plate 17 to the side away from the underground continuous wall 7 through the handle 19, so that all the shelved steel plates 17 are placed on one side of the guide wall 22, completing the recovery of the shelved steel plates 17.

[0059] Since baffles 18 are set above the shelf steel plates 17 on both sides of the guide wall 22 through baffle fixing rods 21, during the process of placing or recovering the shelf steel plates 17, the shelf steel plates 17 are always placed under the baffles 18. Even if there is a human operational error, the shelf steel plates 17 can be prevented from falling into the underground continuous wall 7, thereby improving the safety of construction.

[0060] Example 4:

[0061] Please combine Figures 1-6 The construction method of the underground continuous wall for deeply buried abandoned flexible pipelines comprises the following steps:

[0062] Step S1: Using a total station to locate and determine the elevation of the underground continuous wall slot;

[0063] Step S2: Build a construction platform, excavate a guide groove, remove surface obstacles, and construct a guide wall 22 with limiting holes 27;

[0064] Step S3: The rotary drilling rig is in place, the fixed baffle 4 and the spiral baffle 3 are installed on the drill rod 1, and the vertical angle between the drill rod and the ground is checked and adjusted;

[0065] Step S4: Start the rotary drilling rig, and the drill bit 5 and the spiral blade 2 rotate to cut the soil and sink it. After it exceeds the bottom elevation of the abandoned pipe 8 by -30 cm, the drill tool is rotated in the opposite direction to lift it, completing the crushing and cleaning of the abandoned pipe 8;

[0066] Step S5: Place the pipe-sealing airbag 10 in the abandoned pipe 8 via the telescopic rod 11, turn on the air compressor to inflate the pipe-sealing airbag 10, and unplug the air pipe 14 after reaching the specified pressure to complete the initial blocking.

[0067] Step S6: pouring fluidized solidified soil 25 into the hole until it exceeds the top elevation of the abandoned pipe 8 by 50 cm;

[0068] Step S7: After 24 hours, a hydraulic slotting machine is used to excavate the slot section using a three-claw slotting process;

[0069] Step S8: Make a steel cage according to the designed reinforcement of the underground continuous wall 7 and the division of the unit slot sections. During the lowering of the steel cage, the steel cage needs to be temporarily placed on the shelving steel plate of the guide wall when changing the wire rope. After it is finally lowered to the design elevation, the steel cage 24 is fixed at the design elevation by the shelving steel plate 17.

[0070] Step S9: Concrete is poured using the conduit method to form the underground continuous wall 7.

[0071] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0072] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0073] Although this document uses a lot of professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0074] This application is not limited to the above-mentioned optimal implementation method. Anyone can derive various other forms of products based on the inspiration of this application. However, no matter what changes are made in their shape or structure, any technical solution that is the same or similar to that of this application falls within the scope of protection of this application.

Claims

1. A method for constructing a deep-buried underground continuous wall for abandoned flexible pipes, characterized in that: include: S1. Use a total station to locate and determine the elevation of the underground continuous wall slot; S2, building a construction platform, excavating a guide groove, and constructing a guide wall (22) with a limiting hole (27); S3, the rotary drilling rig is in place, the fixed baffle (4) and the spiral baffle (3) are installed on the drill rod (1), and the vertical angle is adjusted and the drilling is carried out to a height of 30 cm above the bottom of the abandoned pipe (8), and the drilling tool is rotated in the reverse direction to remove the abandoned flexible cable (9); S4, placing the pipeline blocking airbag (10) into the abandoned pipeline (8) through the telescopic rod (11) and the C-shaped rod (28), inflating and blocking it, and then filling it with fluidized solidified soil (25); S5, using a hydraulic slotting machine to form a slot with three grips, and temporarily fixing the steel cage (24) by sliding a steel plate (17) when lowering it; S6. Construction is completed by pouring concrete using the conduit method.

2. The construction method according to claim 1, wherein: The rotary drilling tool for removing the discarded flexible cable (9) comprises: A spiral blade (2) and a guide drill bit (5) are arranged around the drill rod (1), and a spraying pipe (6) is arranged inside; The bottom of the spiral blade (2) is connected to the spiral baffle (3) via a fixed baffle (4), and the distance between the two can be adjusted to adapt to different cable diameters.

3. The construction method according to claim 1, wherein: The gap between the spiral baffle (3) and the spiral blade (2) is used to discharge the crushed soil, and during reverse rotation, the discarded flexible cable (9) is collected in the space formed by the spiral baffle (3) and the fixed baffle (4).

4. The construction method according to claim 1, wherein: Abandoned pipe blocking system includes: Air bag lifting rings (15) and air delivery holes (16) are provided at both ends of the pipeline blocking air bag (10), and the air compressor (23) is connected via an air delivery pipe (14); The C-shaped rod (28) is inserted into the airbag lifting ring (15) through the vertical rod to connect the airbag, and is hinged to the end of the telescopic rod (11), and the hinge angle range is 60° to 150°.

5. The construction method according to claim 4, wherein: The telescopic rod (11) is adjustable in length by means of a locking ring (12), and is suitable for blocking abandoned pipes (8) at different buried depths.

6. The construction method according to claim 1, wherein: Sliding steel cage shelving steel plate assembly includes: The bottom of the shelving steel plate (17) is provided with a pulley (20), the top is provided with a handle (19), and the end is provided with a traction ring (26); The guide wall (22) is provided with a limiting hole (27) and a baffle (18); the limiting hole (27) is higher than the pulley (20) to bear the load and place the steel plate (17).

7. The construction method according to claim 6, wherein: The baffle (18) is fixed to both sides of the guide wall (22) through baffle fixing rods (21) to prevent the shelved steel plate (17) from falling.

8. The construction method according to claim 4, wherein: The fluidized solidified soil (25) is filled in the gaps in the pipeline after being blocked by the air bag, and its strength does not affect the efficiency of the trench excavation and prevents leakage of slurry.

9. The construction method according to claim 4, wherein: The shelving steel plate (17) is moved to the limiting hole (27) for positioning via a traction ring (26) and a pulley (20), and is assisted in recovery by a handle (19).

10. An underground continuous wall for deeply buried abandoned flexible pipes, characterized in that: Constructed using the construction method according to any one of claims 1 to 9, comprising: Abandoned pipe (8) areas removed by rotary drilling tools; The pipeline gap is double-sealed by the air bag (10) and the fluidized solidified soil (25); A steel cage (24) accurately positioned by a sliding shelving steel plate (17) and a cast underground continuous wall (7).

Images