A deep foundation pit underground continuous wall pipe gushing repairing device and method

Abstract

The application provides a deep foundation pit underground continuous wall pipe gushing repairing device and method, and belongs to the field of foundation pit construction. In the related art, a water-stopping steel plate is generally arranged on the wall and is poured with the wall body to form a whole, so that seepage repair is realized. However, with the accumulation of time, the risk of failure and recurrence is high. The device comprises a shell assembly, a drill bit assembly and a driving assembly. The drill bit assembly comprises a main drill bit and a self-advancing anchor drill bit. The driving assembly comprises a driving ring, a main drill shaft and an anchor drill shaft. The anchor drill shaft comprises a flexible shaft section and a guide section. The device is installed at a pre-drilled hole at a seepage position of the wall body. When the driving assembly works, the main drill bit is driven to continue drilling along the hole, and the multiple anchor drill bits are laterally drilled into the soil layer behind the wall. Then, cement slurry is injected to diffuse along the path of the drill bit, form a plugging slurry body, and the drill shaft remains in the slurry body as a bearing structure. In summary, the quality of the repair by using the device and the method is reliable, the durability is high, and the recurrence is not easy.

Description

Technical Field

[0001] The invention belongs to the field of foundation pit construction, and in particular relates to a device and method for repairing piping in an underground continuous wall of a deep foundation pit. Background Art

[0002] An underground continuous wall refers to: using a trenching machine on the ground to excavate a long and narrow deep trench along the peripheral axis of the underground project. After clearing the trench, a steel cage is hung in the trench, and then concrete is poured using the conduit method to form a unit wall trench section. This is carried out section by section to build a continuous reinforced concrete wall underground as a structure for water interception, anti-seepage, load-bearing and water-retaining.

[0003] Piping in underground diaphragm walls occurs when, due to groundwater seepage and other factors, fine particles in the wall are eroded by seepage water, forming pores. These pores then gradually expand due to erosion. If piping in underground diaphragm walls is not promptly addressed, the voids in the wall are likely to expand, forming water channels. This will not only cause further damage to the wall but also seriously endanger the safety of the foundation pit and surrounding buildings.

[0004] In the related art, different repair measures are generally adopted according to the severity of underground continuous wall water seepage. When the underground continuous wall only has slight surface water seepage, the repair method is generally to drill holes and inject grouting into the seepage area. When the underground continuous wall has more serious piping, the drilling and grouting method in the wall is no longer effective. In actual operation, holes are generally drilled in the wall to draw out the pressurized water behind the wall. Then, water-blocking steel plates are installed on the wall and cast into the underground continuous wall to achieve seepage repair.

[0005] However, in the above solution, only the defective wall area is covered by the water-blocking steel plate, thereby blocking the seepage water. The local defects of the underground continuous wall and its surrounding area are still under the erosion of groundwater. As time accumulates, the erosion area further expands, the repair may fail, and the pipe burst may recur. It is difficult to solve the problem from the root, and it will also affect the flatness of the wall surface. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a device and method for repairing underground continuous wall pipe bursts in deep foundation pits, which is used to solve the problem that the method of using water-blocking steel plates for sealing when repairing underground continuous wall pipe bursts in the prior art has low reliability and high failure rate over time.

[0007] To achieve the above-mentioned and other related purposes, the present invention provides a device and method for repairing piping in underground continuous walls of deep foundation pits.

[0008] Among them, a deep foundation pit underground continuous wall pipe burst repair device includes: a shell assembly, a drill assembly and a drive assembly, the drill assembly is located at the end of the shell assembly, the drive assembly is located inside the shell assembly, and the drill assembly is driven by the drive assembly;

[0009] The housing assembly includes a drill seat, a wall seat and a drive seat connected in sequence, and the drill assembly is installed on the drill seat;

[0010] The drill bit assembly includes a main drill bit and an anchor drill bit, wherein the main drill bit is installed in the axial direction of the drill bit seat, and the anchor drill bit is installed in the circumferential direction of the drill bit seat, and the anchor drill bit is a self-feeding drill bit;

[0011] The drive assembly includes a drive ring, a main drill shaft and an anchor drill shaft;

[0012] The drive ring includes a main gear, an anchor gear and a ring gear, wherein the main gear is an external gear and the ring gear is an internal gear. The main gear is located at the center of the ring gear, and the axes of the main gear and the ring gear coincide with each other. The anchor gear is meshed with the main gear and the ring gear at the same time, and the outer periphery of the ring gear is engaged with the drive seat through a threaded fit;

[0013] The anchor drill shaft includes a soft shaft section and a guide section. The soft shaft section is flexible. The end of the soft shaft section is connected to the anchor drill bit. The end of the guide section is connected to the center hole of the anchor gear through a quick-release structure. The other end of the guide section is slidably matched with the drive seat through a guide structure. One end of the main drill shaft is fixedly connected to the center hole of the main gear, and the other end is fixedly connected to the main drill bit.

[0014] Optionally, the tail end of the anchor drill bit is connected to the drill bit seat via a thread.

[0015] Optionally, the anchor drill shaft includes a protective sleeve and a core shaft. In the soft shaft section, the protective sleeve is flexible, and in the guide section, the protective sleeve is hard.

[0016] Optionally, a slurry outlet is provided at the connection end between the protective sleeve and the anchor drill bit, and the slurry outlet communicates with the inside and outside of the protective sleeve.

[0017] Optionally, in the guide section, a support member is provided between the protective sleeve and the core shaft, the outer periphery of the support member is fixedly connected to the protective sleeve, the inner periphery of the support member is rotatably matched with the core shaft, and a slurry hole is also provided on the support member.

[0018] Optionally, the quick release structure comprises a quick release opening and a quick release screw, the end of the guide segment is provided with a quick release screw hole matched with the quick release screw, the quick release opening is arranged along the axis of the quick release screw hole, and when the quick release screw is screwed into the quick release screw hole, the end of the guide segment is extruded and expanded and is tightly connected with the anchor gear.

[0019] Optionally, the drilling end of the anchor drill bit and the main drill bit is provided with a spiral self-advancing structure.

[0020] Optionally, the anchor drill bit is four, which are arranged around the drill bit seat.

[0021] The deep foundation pit underground continuous wall pipe heave repairing method adopts the repairing device as described above, and comprises the following steps:

[0022] The identification step identifies the center area of the pipe heave on the underground continuous wall surface;

[0023] The preparation step uses a drilling machine to drill a hole in the center area of the pipe heave, and the wall is drilled through;

[0024] The installation step installs the repairing device, the drill bit seat is located on the inner side of the underground continuous wall, the wall seat is matched with the drill hole, and the driving seat is located on the outer side of the underground continuous wall;

[0025] The anchoring step uses a drilling machine to provide power for the main drill shaft, the main drill bit is drilled along the axis of the drill hole, and the plurality of anchor drill bits are divergently drilled around the drill hole, after the drilling is completed, the wall seat and the driving seat are removed;

[0026] The grouting step pressurizes and injects cement slurry from the drill hole, and after the cement slurry fills the drill hole behind the underground continuous wall and fully penetrates in the silt, the drill hole is sealed.

[0027] Optionally, the grouting step comprises:

[0028] The coarse grouting step directly grouts from the drill hole by using coarse cement mortar;

[0029] The fine grouting step grouts from the protective sleeve by using fine cement slurry.

[0030] As described above, the deep foundation pit underground continuous wall pipe heave repairing device and method of the present application has at least the following beneficial effects:

[0031] The repair quality is good, the reliability and durability of the repaired wall are high, and there is no need to set a protruding structure on the outer wall. Specifically, the device includes a shell assembly, a drill bit assembly and a drive assembly, and the drill bit assembly includes a main drill bit and an anchor drill bit, and the anchor drill bit is a self-propelled drill bit. The drive assembly includes a drive ring, a main drill shaft and an anchor drill shaft, and the anchor drill shaft includes a soft shaft section and a guide section. The soft shaft section is flexible, and the end is connected to the anchor drill bit. When in use, the device is installed in the pre-drilled hole at the seepage part of the wall. Combined with this method, when the drive assembly is working, it drives the main drill bit to continue drilling along the hole, and multiple anchor drill bits are located around it, laterally penetrating into the soil layer behind the wall. Cement slurry is then injected into the hole. The cement slurry diffuses along the drilling path of the main drill bit and the anchor drill bit and its surroundings to form a sealing slurry. The main drill shaft and the anchor drill shaft remain in the slurry to become the bearing structure of the concrete block. In summary, the beneficial effects of the device and method are that the repair quality is reliable, the durability is high, the seepage is not easy to recur, and no repair structure will be left on the exterior wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shown is a schematic diagram of the initial state of the present invention.

[0033] Figure 2 Shown is a schematic diagram of the present invention in use.

[0034] Figure 3 Shown is a schematic diagram of the drive ring of the present invention.

[0035] Figure 4 Shown is a schematic diagram of the drill bit seat portion of the present invention.

[0036] Figure 5 Shown is a schematic diagram of the drive assembly of the present invention.

[0037] Figure 6 Shown is a schematic diagram of the anchor drill bit connection of the present invention.

[0038] Figure 7 Shown is a schematic diagram of the repair effect of the present invention.

[0039] Among them: shell assembly 1, drill bit seat 10, wall seat 11, drive seat 12, drill bit assembly 2, main drill bit 20, anchor drill bit 21, spiral self-feeding structure 210, drive assembly 3, drive ring 30, main gear 301, anchor gear 302, ring gear 303, main drill shaft 31, anchor drill shaft 32, soft shaft section 320, guide section 321, protective sleeve 326, slurry outlet 3261, core shaft 328, support member 325, slurry hole 3251, quick-release structure 33, guide structure 34, underground continuous wall 9. DETAILED DESCRIPTION

[0040] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0041] See also Figures 1 to 7 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0042] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0043] For this example, please refer to Figure 1-3, an embodiment of a deep foundation pit underground continuous wall pipe burst repair device, includes a shell assembly 1, a drill assembly 2 and a drive assembly 3, the drill assembly 2 is located at the end of the shell assembly 1, the drive assembly 3 is located inside the shell assembly 1, and the drill assembly 2 is driven by the drive assembly 3. The drill assembly 2 is only temporarily installed on the shell assembly 1, which is convenient for extending the drill assembly 2 into the wall hole together with the shell, and a hole-axis matching method that is easy to fall off can be adopted. The shell assembly 1 includes a drill seat 10, a wall seat 11 and a drive seat 12 connected in sequence, and the drill assembly 2 is installed on the drill seat 10. The drill assembly 2 includes a main drill bit 20 and an anchor drill bit 21, the main drill bit 20 is installed in the axial direction of the drill seat 10, and the anchor drill bit 21 is installed in the circumference of the drill seat 10, and the anchor drill bit 21 is a self-feeding drill bit. Here, the anchor drill bit 21 does not necessarily have to be along the radial direction of the main drill bit 20. It can also be oblique, forming an angle less than 90° with the axis of the main drill bit 20, so that an umbrella-like distribution pattern is formed between the main drill bit 20 and the multiple anchor drill bits 21. The drive assembly 3 includes a drive ring 30, a main drill shaft 31, and an anchor drill shaft 32. The drive ring 30 includes a main gear 301, an anchor gear 302, and a ring gear 303. The main gear 301 is an external gear, and the ring gear 303 is an internal gear. The main gear 301 is located at the center of the ring gear 303, and the axes of the main gear 301 and the ring gear 303 coincide. The multiple anchor gears 302 are simultaneously engaged with the main gear 301 and the ring gear 303. The outer periphery of the ring gear 303 is threadedly engaged with the drive seat 12. The anchor drill shaft 32 includes a soft shaft section 320 and a guide section 321. The soft shaft section 320 is flexible. The end of the soft shaft section 320 is connected to the anchor drill bit 21. The end of the guide section 321 is connected to the center hole of the anchor gear 302 through a quick-release structure 33. The other end of the guide section 321 slides with the drive seat 12 through a guide structure 34. The guide section 321 can slide along the axis in the guide structure 34, or slide circumferentially around the axis, or rotate around the axis. The guide structure 34 can be a guide hole arranged on the inner side of the drive seat 12. One end of the main drill shaft 31 is fixedly connected to the center hole of the main gear 301, and the other end is fixedly connected to the main drill bit 20.

[0044] In the above embodiment, the working principle is as follows: before starting the repair, the seepage situation must be detected. Ultrasonic methods can be used to identify the soil state behind the wall at the seepage point. This device is more suitable for soils that are not hard rock layers, such as soils mainly composed of gravel and muddy siltstone. After understanding the soil layer conditions, drill holes at the seepage point of the underground continuous wall and then install the device. In the initial state, please refer to Figure 1 The drill bit seat 10 is inserted into the inner side of the underground continuous wall 9 and contacts the soil layer. The wall seat 11 cooperates with the drill hole. The drive seat 12 is located outside the underground continuous wall 9, and the drive ring 30 is relatively located at the end of the drive seat 12. When working, the drive ring 30 is driven by external power. When it is specifically implemented, it can be Figure 3As shown, a non-circular mating hole is provided at the end of the main drill shaft 31. An external drill rig inserts a drill rod into this mating hole to drive the main drill shaft 31 and its mating main gear 301. When the main gear 301 rotates, it drives the various anchor gears 302 to rotate accordingly. The anchor gears 302, in turn, mesh with the ring gear 303, which in turn drives the ring gear 303 to rotate. Because the anchor drill shaft 32 is fixedly connected to the axial hole of the anchor gear 302 and is also connected to the guide structure 34 inside the drive base 12, the axis of the anchor drill shaft 32 is fixed, and so is the axis of the anchor gears 302. Therefore, in the drive ring 30, when the main gear 301 rotates, it drives the multiple anchor gears 302 to rotate on their own, rather than orbiting around the central gear. The anchor gears 302 then drive the outer ring gear 303 to rotate. Because the outer periphery of the ring gear 303 is threadedly engaged with the drive base 12, when the ring gear 303 rotates, the entire drive ring 30 moves within the drive base 12 along its axis, thereby driving the main drill shaft 31 and the anchor drill shaft 32 to move along their axes. In summary, when the device is operating, the combined actions of the drive end are as follows: the main drill shaft 31 simultaneously rotates about its axis and moves linearly along its axis, while the anchor drill shaft 32 simultaneously rotates about its axis and moves linearly along its axis. The ends of the main drill shaft 31 and the anchor drill shaft 32 are connected to the main drill bit 20 and the anchor drill bit 21 respectively. When the main drill shaft 31 performs rotational motion and linear motion at the same time, the main drill bit 20 drills further into the soil layer along the axial direction. When the anchor drill shaft 32 performs rotational motion and linear motion at the same time, the anchor drill bit 21 also performs rotational motion. Because the anchor drill bit 21 is a self-propelled drill bit, during the rotation of the anchor drill bit 21, the anchor drill bit 21 will automatically penetrate into the soil layer and drill deeper. The drilling depth displacement is compensated by the axial motion of the anchor drill shaft 32 to prevent pulling. After drilling for a certain period of time, the state reached is as follows: Figure 2 As shown, the main drill bit 20 is now axially inserted into the soil layer, while the multiple anchor drill bits 21 are laterally inserted into the soil layer. Since the ultimate goal is to pour concrete, the drilling direction and depth accuracy of the anchor drill bits 21 are not required to be high. In this drive method, an external drive device, such as a drilling rig, can drive the main gear, thereby simultaneously driving the main drill bit 20 and the multiple anchor drill bits 21 for drilling. Moreover, during drilling, the drive ring 30 can automatically move along the axis without the operator having to apply axial pressure to the external drive drill. This can reduce the operator's operating difficulty and save more effort. Overall, the operation is convenient and efficient.

[0045] In the above embodiment, the beneficial effect is that the repair quality of the underground continuous wall is good, it is not easy to recur after repair, and it will not affect the flatness of the inner side of the wall. Figure 2In the state shown, the external drilling rig, wall base 11, drive base 12 and drive ring 30 can be removed, and then grouting can be carried out inside the wall. Figure 7 In the original soil layer 8, the grouting body includes a direct grouting area 70 and a permeation grouting area 71. In the direct grouting area 70, concrete slurry can fill the drilled area. Under the action of external grouting pressure, the slurry will penetrate and diffuse from the soil layer surrounding the drilled hole, ultimately forming a cone-shaped integral grouting body. The end of the cone is aligned with the inner wall surface of the underground continuous wall. Its cross-section is much larger than the drilled hole in the wall, and the tip of the cone faces the soil layer. The grouting body repairs local defects in the underground continuous wall. The steel main drill shaft 31 and anchor drill shaft 32 are cast as one piece with the concrete, strengthening the concrete. If necessary, anchors can be used to tension the main drill shaft 31 and anchor drill shaft 32 at the hole on the wall surface. Because the main drill bit 20 and anchor drill bit 21 are both larger than their own drill shafts, they can also generate anchoring force, firmly fixing the concrete block to the underground continuous wall and forming internal stress in the concrete, enhancing the reliability and stability of the seepage repair, especially for a long time after the repair, and preventing recurrence. The ends of the main drill shaft 31 and the anchor drill shaft 32 exposed from the wall are cut off, or fixed with anchors, and can be poured into the drilled holes of the wall without affecting the flatness of the wall surface.

[0046] For this example, please refer to Figure 4 The tail end of the anchor drill bit 21 is connected to the drill bit holder 10 through a thread. During specific implementation, a drilling rig is first used to drill a hole in the underground continuous wall and drill out an installation area in the soil layer inside the wall. After the drilling rig is pulled out, the installation area is loose sand. In order to be able to pass the drill bit holder 10 and the main drill bit 20 and anchor drill bit 21 installed on the drill bit holder 10 through the drill hole and place them into the inner installation area, the diameter of the main drill bit 20 must be smaller than the wall hole, and the protrusion of the laterally arranged anchor drill bit 21 must not exceed the wall hole. After the drill bit holder 10 is placed in the installation area, when the anchor drill bit 21 just starts to rotate, the self-feeding structure on the anchor drill bit 21 may not be able to fully contact the soil layer, and the tail end of the anchor drill bit 21 is connected to a flexible soft shaft, so it is difficult to generate drilling thrust for the anchor drill bit 21, which in turn causes the anchor drill bit 21 to idle and fail to penetrate the soil layer. In this embodiment, by providing a threaded connection between the tail end of the anchor drill bit 21 and the drill bit holder 10, during the initial rotation of the anchor drill bit 21, even if the anchor drill bit 21 does not fully penetrate the soil layer, the thread at the tail end can be used to allow the drill bit to drill out a certain distance and penetrate into the soil layer. When the self-feeding structure at the front end of the anchor drill bit 21 contacts the soil layer, it can produce a continuous self-feeding effect under the action of rotation. In this way, it can drill into the soil layer, form a subsequent grouting channel and anchoring structure, and improve the stability and reliability of seepage repair.

[0047] For this example, please refer to Figure 1-2The anchor drill shaft 32 includes a protective sleeve 326 and a core shaft 328. In the soft shaft section 320, the protective sleeve 326 is flexible, and in the guide section 321, the protective sleeve 326 is hard. When an embodiment with a protective sleeve 326 is adopted, the guide section of the protective sleeve 326 is slidably connected to the guide structure 34. The guide section 321 facilitates the axial movement of the anchor drill shaft 32, so that during the drilling process of the anchor drill bit 21, the rear end of the rotating shaft can move accordingly without causing pulling, and the soft shaft section 320 allows the anchor drill shaft 32 to bend, thereby achieving lateral drilling under limited space conditions. The protective sleeve 326 can prevent multiple core shafts 328 from contacting, rubbing, or even entangled with each other, which can effectively improve the reliability of the device.

[0048] For this example, please refer to Figure 6 The connection end between the protective sleeve 326 and the anchor drill bit 21 is provided with a slurry outlet 3261, which connects the inside and outside of the protective sleeve 326. The protective sleeve 326 and the anchor drill bit 21 are in rotational fit, and there is a gap between the protective sleeve 326 and the anchor drill bit 21. When the anchor drill bit 21 rotates, the protective sleeve 326 is stationary. After the drilling of the device is completed and the unnecessary parts are removed, grouting is required. Since the diameter of the anchor drill bit 21 and the protective sleeve 326 is smaller than that of the main drill bit 20, the grouting channel formed is also smaller. When the slurry is injected from the outside to the inside, the slurry may push the mud and sand inward to form a blockage. In this embodiment, a grouting method can be formed from the inside out through the protective sleeve 326 and the slurry outlet 3261. The slurry is injected from the protective sleeve 326, enters the protective sleeve 326, and then flows out of the slurry outlet 3261, reversely filling the borehole, and finally forming a grouting area. Overall, the reliability of grouting during the implementation of this device is improved, the slurry distribution quality is better, and the repair effect is enhanced. When this device is applied to other drilling scenarios, water can also be injected from the protective sleeve to reduce the resistance of the drill bit during drilling, while also having a cooling effect, which is beneficial to improving the drilling quality and enhancing the durability of the device.

[0049] For this example, please refer to Figure 2 and Figure 5 A support member 325 is provided between the guide section 321, the protective sleeve 326 and the core shaft 328. The outer periphery of the support member 325 is fixedly connected to the protective sleeve 326, and the inner periphery of the support member 325 is rotatably matched with the core shaft 328. A slurry hole 3251 is also provided on the support member 325. The outer periphery of the protective sleeve 326 is connected to the guide structure 34 on the inner side of the drive seat 12, so that the drive seat 12 supports the protective sleeve 326, and the support member 325 in the protective sleeve 326 supports the hard section of the core shaft 328, thereby enhancing the strength and rotational stability of the core shaft 328, thereby better limiting the axis of the core shaft 328, and ensuring that the core shaft 328 does not rotate around the drive ring 30. In this embodiment, Figure 5 As shown, an end plate can also be provided at the end of the drive ring 30. This end plate is slidably engaged with the main body of the drive ring 30, and the protective sleeve 326 is pressed against the end plate. When the drive ring 30 rotates, the protective sleeve 326 and the end plate do not rotate. A hole is formed in the end plate, which coincides with the axial hole of the anchor gear 302. The anchor gear 302 can be rotatably installed in this hole. The hole also allows the anchor drill shaft 32 to pass through. After passing through this hole, the anchor drill shaft 32 is connected to the anchor gear 302 as a whole. An end plate can also be provided on the other side of the drive ring 30 to provide a protective encapsulation for the planetary gears inside the drive ring 30, preventing foreign matter from entering and affecting its function.

[0050] For this example, please refer to Figure 3 The quick-release structure 33 includes a quick-release opening and a quick-release screw. The end of the guide section 321 is provided with a quick-release screw hole that mates with the quick-release screw. It should be noted that if a protective sleeve 326 is provided, the end of the guide section 321 refers to the end of the core shaft 328, rather than the end of the guide section of the protective sleeve 326. The quick-release opening is arranged along the axis of the quick-release screw hole. When the quick-release screw is screwed into the quick-release screw hole, the end of the guide section 321 is squeezed and expanded, becoming tightly connected to the anchor gear 302. In this embodiment, the fastening method of the guide section 321 and the anchor gear 302 is reliable and easy to disassemble.

[0051] For this example, please refer to Figure 1 and Figure 2 The drilling ends of both the anchor drill bit 21 and the main drill bit 20 are equipped with a spiral self-feeding structure 210. This structure not only provides penetration force for the drill bit, but also serves to expand the hole and agitate the soil, facilitating the formation of a grouting channel. After grouting, the spiral structure also provides the drill bit with a better grip, acting as an anchor head, providing anchoring force and enhancing the structural strength after concrete pouring, resulting in a more reliable repair effect.

[0052] For further information, see Figure 1 and Figure 2 Four anchor drill bits 21 are provided, one on each side of the drill seat 10. By providing grouting channels in four directions, a more reliable repair effect can be achieved. When piping is more severe or the defects of the underground continuous wall are more serious, more anchor drill bits 21 can be provided, for example, six or eight. These can be evenly distributed along the circumference of the drill seat 10, or unevenly distributed according to the wall and soil conditions to enhance the repair effect.

[0053] This embodiment is an embodiment of a method for repairing piping in an underground continuous wall of a deep foundation pit, using the above-mentioned repair device, and includes the following steps:

[0054] The identification step involves identifying the central area of ​​piping on the surface of the underground continuous wall 9. This can generally be done by observing the water flow. If conditions permit, ultrasonic equipment can be used to examine the piping penetration area of ​​the wall to determine the soil quality and water accumulation behind the wall. If the main structure behind the wall is rock, this method and device will not be suitable for treatment. This method is more suitable for situations where the wall behind the wall is soil.

[0055] The preparatory step is to use a drill to drill a hole in the center of the piping burst and penetrate the wall. If there is significant water pressure at the piping burst, it may be difficult to use a larger diameter drill bit directly. Instead, a smaller diameter drill bit can be used for pre-drilling. This small hole can be used to drain or divert the accumulated water behind the wall before enlarging the hole. When enlarging the hole, a slightly larger drill bit can be used, but attention should be paid to the presence of any rebar cages in the wall, drilling through the gaps and avoiding them.

[0056] Installation steps, install the repair device, such as Figure 1 As shown, the drill seat 10 is located on the inner side of the underground continuous wall 9, the wall seat 11 cooperates with the drill hole, and the drive seat 12 is located on the outer side of the underground continuous wall 9;

[0057] Anchoring steps, such as Figure 2 As shown, an external drilling rig is used to power the main drill shaft 31. The main drill bit 20 drills along the axial direction of the borehole, and multiple anchor drill bits 21 drill in a divergent manner along the periphery of the borehole. After drilling is completed, the wall base 11 and the drive base 12 are removed. In this step, the drilling principle of the main drill bit 20 and the anchor drill bit 21 has been explained in the embodiment of the device section and will not be repeated here.

[0058] Grouting steps, such as Figure 7 As shown, cement slurry is injected under pressure from the borehole, and the cement slurry fills the borehole behind the underground continuous wall 9 and is sealed after being fully penetrated into the mud and sand. In specific implementation, the grouting steps include:

[0059] In the coarse slurry step, a coarse cement mortar is used to directly grout the drill hole, and the cement mortar fills the drill holes of the main drill bit 20 and the anchor drill bit 21 from the outside to the inside;

[0060] In the fine slurry step, finer cement slurry is used to inject grout from the protective sleeve 326. The cement slurry enters from the outer end of the protective sleeve 326, then flows along the inside of the protective sleeve 326, and finally flows out from the slurry outlet 3261, starting from the position of the anchor drill bit 21 and reversely filling the drilling area of ​​the anchor drill bit 21.

[0061] In the above embodiment, the cement mortar or cement slurry can also be added with additives with water blocking and waterproofing effects. Such materials are widely used in the construction industry and can be selected as needed. In the specific embodiment, the order of the coarse slurry step first and the fine slurry step can be adopted as needed, or the order of the fine slurry step first and the coarse slurry step can be adopted. Grouting can also be performed crosswise and multiple times. The final result is as follows Figure 7 In the repaired state shown, the grouting body includes a direct grouting area 70 and a permeation grouting area 71 in the original soil layer 8. The entire grouting area is tapered, with the back end of the cone attached to the leaking defect area of ​​the wall and the tip of the cone facing the soil layer. After the wall is repaired, even if more groundwater accumulates later, the grouting body can effectively plug the leak, achieving an excellent repair state, reliable repair effect, and unlikely to recur.

[0062] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A deep foundation pit underground continuous wall pipe burst repair device, characterized by: It comprises a housing assembly (1), a drill assembly (2) and a drive assembly (3), wherein the drill assembly (2) is located at the end of the housing assembly (1), the drive assembly (3) is located inside the housing assembly (1), and the drill assembly (2) is driven by the drive assembly (3); The housing assembly (1) comprises a drill seat (10), a wall seat (11), and a drive seat (12) connected in sequence, and the drill assembly (2) is mounted on the drill seat (10); The drill bit assembly (2) comprises a main drill bit (20) and an anchor drill bit (21), wherein the main drill bit (20) is installed in the axial direction of the drill bit seat (10), and the anchor drill bit (21) is installed in the circumferential direction of the drill bit seat (10), and the anchor drill bit (21) is a self-propelled drill bit; The driving assembly (3) comprises a driving ring (30), a main drilling shaft (31) and an anchor drilling shaft (32); A non-circular matching hole is provided at the end of the main drill shaft (31), and the rotation of the main drill shaft is driven by inserting a drill rod of an external drilling rig into the matching hole; The driving ring (30) comprises a main gear (301), an anchor gear (302) and a ring gear (303); the main gear (301) is an external gear, the ring gear (303) is an internal gear, the main gear (301) is located at the center of the ring gear (303), and the axes of the main gear (301) and the ring gear (303) coincide with each other; the anchor gear (302) is meshed with the main gear (301) and the ring gear (303) at the same time; and the outer periphery of the ring gear (303) is engaged with the driving seat (12) through a threaded connection; The anchor drill shaft (32) comprises a soft shaft section (320) and a guide section (321); the soft shaft section (320) is flexible; the end of the soft shaft section (320) is connected to the anchor drill bit (21); the end of the guide section (321) is fixedly connected to the center hole of the anchor gear (302) via a quick-release structure (33); the other end of the guide section (321) is slidably engaged with the drive seat (12) via a guide structure (34); one end of the main drill shaft (31) is fixedly connected to the center hole of the main gear (301), and the other end is fixedly connected to the main drill bit (20).

2. A deep foundation pit underground continuous wall pipe burst repair device according to claim 1, characterized in that: The tail end of the anchor drill bit (21) is connected to the drill bit seat (10) via a thread.

3. A deep foundation pit underground continuous wall (9) pipe burst repair device as claimed in claim 1, characterized in that: The anchor drill shaft (32) includes a protective sleeve (326) and a core shaft (328); In the soft shaft section (320), the protective sleeve (326) is flexible; In the guide section (321), the protective sleeve (326) is hard.

4. A deep foundation pit underground continuous wall pipe burst repair device as claimed in claim 3, characterized in that: A slurry outlet (3261) is provided at the connection end between the protective sleeve (326) and the anchor drill bit (21), and the slurry outlet (3261) communicates with the inside and outside of the protective sleeve (326).

5. A deep foundation pit underground continuous wall pipe burst repair device as claimed in claim 3, characterized in that: A support member (325) is provided between the guide section (321), the protective sleeve (326) and the core shaft (328); the outer periphery of the support member (325) is fixedly connected to the protective sleeve (326); the inner periphery of the support member (325) is rotatably engaged with the core shaft (328); and a slurry hole (3251) is further provided on the support member (325).

6. A deep foundation pit underground continuous wall pipe burst repair device as claimed in claim 1, characterized in that: The quick-release structure (33) comprises a quick-release opening and a quick-release screw. The end of the guide section (321) is provided with a quick-release screw hole that cooperates with the quick-release screw. The quick-release opening is arranged along the axis of the quick-release screw hole. When the quick-release screw is screwed into the quick-release screw hole, the end of the guide section (321) is squeezed and expanded and is fastened to the anchor gear (302).

7. The deep foundation pit underground continuous wall pipe burst repair device according to claim 1, characterized in that: The drilling ends of the anchor drill bit (21) and the main drill bit (20) are both provided with a spiral self-feeding structure (210).

8. The deep foundation pit underground continuous wall pipe burst repair device according to claim 1, characterized in that: There are four anchor drill bits (21), which are respectively arranged around the drill bit seat (10).

9. A method for repairing piping in underground continuous walls of deep foundation pits, characterized by: The repair device according to claim 5 comprises the following steps: Identification step, identifying the central area of ​​the pipe burst on the surface of the underground continuous wall (9); Preparation step: Use a drilling rig to drill a hole in the center of the piping and drill through the wall; An installation step, wherein the repair device is installed, the drill seat (10) is located inside the underground continuous wall (9), the wall seat (11) cooperates with the drill hole, and the drive seat (12) is located outside the underground continuous wall (9); Anchoring step, using a drilling rig to provide power to the main drill shaft (31), the main drill bit (20) drills along the axial direction of the borehole, and multiple anchor drill bits (21) drill divergently along the four sides of the borehole. After drilling is completed, the wall seat (11) and the drive seat (12) are removed; The grouting step is to inject cement slurry under pressure from the drill hole, and the cement slurry fills the drill hole behind the underground continuous wall (9) and seals the drill hole after fully penetrating into the mud and sand.

10. A method for repairing piping in underground continuous walls of deep foundation pits according to claim 9, characterized in that: The grouting step comprises: a coarse grouting step, using a coarse cement mortar to grout directly from the drill hole; In the fine slurry step, finer cement slurry is used to inject grout from the protective casing (326).

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