A foundation hollowing directional repairing device and method for existing building

Abstract

This application discloses a directional repair device and method for hollow areas in the foundation of existing buildings, relating to the field of building technology. It not only enables effective grouting to repair hollow areas without damaging the existing foundation, but also allows the drill bit to extend and retract during the grouting process, eliminating the need to pull out the directional drill before grouting. The device includes a drill bit power unit, a grouting pipe section, and multiple connecting pipe sections. The drill bit power unit includes a first outer casing assembly, a drill bit, a drill bit drive mechanism, a drill bit retraction mechanism, a drill bit deflection mechanism, and a first support forward mechanism. The drill bit drive mechanism drives the drill bit to rotate; the drill bit retraction mechanism retracts the drill bit into the first outer casing assembly; the drill bit deflection mechanism adjusts the drilling direction of the drill bit; and the first support forward mechanism drives the drill bit drive mechanism, drill bit retraction mechanism, and drill bit deflection mechanism forward. This application also discloses a repair method.

Description

Technical Field

[0001] This application relates to the field of building technology, and in particular to a device and method for directional repair of hollow foundations in existing buildings. Background Technology

[0002] The foundation refers to the soil or rock mass supporting a building. With continuous human activity and natural movement, the foundation can develop hollow areas, leading to a reduction in its load-bearing capacity. Current directional drilling grouting methods are mostly used for perimeter grouting to protect tunnels and pipelines. Applying this method directly to hollow areas in the foundation makes it difficult to control the direction of grout diffusion, compromising grouting effectiveness and potentially damaging the existing foundation. Furthermore, to prevent the drill bit from contacting the grout during grouting and affecting the grouting effect, existing directional drilling requires partially detaching and pulling out the drill bit before grouting, which is complex and inefficient. Summary of the Invention

[0003] The embodiments of this application provide a directional repair device for hollow foundations of existing buildings. It can not only effectively grout without damaging the existing foundation to repair hollow areas, but also allows the drill bit to extend and retract during the grouting process, eliminating the need to pull out the directional drill before grouting.

[0004] To achieve the above objectives, one embodiment of this application provides a directional repair device for hollow foundations of existing buildings, comprising a drill bit power unit, a grouting pipe section, and multiple connecting pipe sections connected in series along the axial direction; the drill bit power unit includes a first housing assembly and a drill bit, a drill bit drive mechanism, a drill bit retraction mechanism, a drill bit deflection mechanism, and a first support forward mechanism disposed within the first housing assembly; the drill bit drive mechanism can drive the drill bit to rotate; the drill bit retraction mechanism can drive the drill bit to retract into the first housing assembly; the drill bit deflection mechanism can adjust the drilling direction of the drill bit; the first support forward mechanism can drive the drill bit drive mechanism, the drill bit retraction mechanism, and the drill bit deflection mechanism forward; a first directional positioning mechanism is provided within the grouting pipe section; and a second directional positioning mechanism is provided within each of the connecting pipe sections.

[0005] Furthermore, the first outer shell assembly includes a first upper shell, a conical intermediate sleeve, a first lower shell, and a mud swirl sleeve connected in series along the axial direction; the diameter of the first lower shell is smaller than the diameter of the first upper shell; a first power and signal transmission line is provided on the side wall of the first upper shell; the lower end of the first power and signal transmission line is connected to the conical intermediate sleeve; a first mud conveying pipe is provided on the side wall of the first upper shell and the conical intermediate sleeve, and the lower end of the first mud conveying pipe is connected to the mud swirl sleeve.

[0006] Furthermore, the drill bit drive mechanism includes a power transmission rod with a drive motor; the lower end of the power transmission rod with the drive motor is connected to the drill bit, and the power transmission rod with the drive motor can drive the drill bit to rotate.

[0007] Furthermore, the drill bit retraction mechanism includes two sets of lifting assemblies arranged symmetrically with respect to the power transmission rod with the drive motor; each lifting assembly includes a lifting motor, a transmission rod, a lifting rack, and two lifting gears; the lifting motor is floatingly connected to the conical intermediate sleeve; both lifting gears are connected to the output shaft of the lifting motor through the transmission rod, and the lifting rack is arranged vertically on the outer wall of the power transmission rod with the drive motor.

[0008] Furthermore, there are multiple drill bit deflection mechanisms, which are evenly distributed along the circumference of the power transmission rod with the drive motor. Each drill bit deflection mechanism includes a deflection stabilizing ring and a first pull-wire moving mechanism. The deflection stabilizing ring is fixed to the outer wall of the power transmission rod with the drive motor and is located on the upper end face of the conical intermediate sleeve. The deflection stabilizing ring is connected to the conical intermediate sleeve through an elastic element. The protruding end of the first pull-wire moving mechanism is connected to the inner wall of the first upper shell, and the fixed end is connected to the outer side of the deflection stabilizing ring.

[0009] Furthermore, the first wire pulling and moving mechanism includes a steel strand stretching and contracting motor, a steel strand, a spring, an upper fixing block, and a lower fixing block; the fixed end of the steel strand stretching and contracting motor is connected to the lower fixing block, the output end is connected to the first end of the steel strand being wound, the second end of the steel strand is connected to the upper fixing block, and the spring is sleeved on the steel strand; the upper fixing block is connected to the inner wall of the first upper shell, and the lower fixing block is connected to the outer side of the deflection stabilizing ring.

[0010] Furthermore, the first support advancing mechanism includes a plurality of support boots evenly distributed circumferentially on the first lower shell, and a second and a third pull-wire moving mechanism disposed between the support boots and the first lower shell; the upper fixing block of the second pull-wire moving mechanism is connected to the upper end of the outer wall of the first lower shell, and the lower fixing block is connected to the middle part of the inner wall of the support boot; the upper fixing block of the third pull-wire moving mechanism is connected to the middle part of the inner wall of the support boot, and the lower fixing block is connected to the lower end of the outer wall of the first lower shell.

[0011] Further, the grouting pipe section includes a second outer shell assembly and a first grouting pipe disposed within the second outer shell assembly; a second slurry conveying pipe and a second power and signal transmission line are provided inside the side wall of the second outer shell assembly; a first rubber filler is filled between the second outer shell assembly and the first grouting pipe, and a first directional positioning mechanism is provided inside the first rubber filler; the first directional positioning mechanism is connected to the second power and signal transmission line; the second outer shell assembly includes a second upper shell, a first intermediate shell, and a grouting plate; the diameter of the first intermediate shell is smaller than the diameter of the second upper shell and the grouting plate; a second supporting forward mechanism is provided outside the first intermediate shell; the structure of the second supporting forward mechanism is the same as the structure of the first supporting forward mechanism.

[0012] Furthermore, the connecting pipe section includes a third outer shell assembly and a second grouting pipe disposed within the third outer shell assembly; a third slurry conveying pipe and a third power and signal transmission line are provided within the side wall of the third outer shell assembly; a second rubber filler is filled between the third outer shell assembly and the second grouting pipe, and a second directional positioning mechanism is provided within the second rubber filler; the second directional positioning mechanism is connected to the third power and signal transmission line; the third outer shell assembly includes a third upper shell, a second intermediate shell, and a fixing sleeve; the diameter of the second intermediate shell is smaller than the diameter of the third upper shell and the fixing sleeve; a third supporting forward mechanism is provided outside the second intermediate shell, and the structure of the third supporting forward mechanism is the same as that of the first supporting forward mechanism.

[0013] On the other hand, embodiments of this application also provide a repair method based on the aforementioned directional repair device for hollow foundations of existing buildings, comprising the following steps: S1, performing path planning based on known hollow information of the building; S2, connecting and installing the drill bit power unit, grouting pipe section, and connecting pipe section, and starting drilling; S3, obtaining the positions of the drill bit power unit, grouting pipe section, and connecting pipe section, and adjusting the deflection position of the drill bit according to the positions of the drill bit power unit, grouting pipe section, and connecting pipe section; S4, after reaching the hollow area of ​​the foundation, the drill bit retraction mechanism retracts the drill bit into the first outer shell assembly; S5, grouting is performed according to technical requirements; S6, after grouting is completed, the drill bit power unit, grouting pipe section, and connecting pipe section gradually retract, completing the directional repair of hollow foundations of existing buildings.

[0014] This application has the following advantages over the prior art:

[0015] 1. The existing building foundation hollow directional repair device in this application adopts a spliced ​​drill bit power part, grouting pipe section and multiple connecting pipe sections, which can meet the grouting needs of multiple parts.

[0016] 2. The existing building foundation hollow directional repair device in this application adopts a drill bit retraction mechanism so that the drill bit can be retracted into the shell, eliminating the need to pull out the directional drill bit before grouting.

[0017] 3. In the embodiments of this application, the drill bit power unit, grouting pipe section and connecting pipe section in the existing building foundation hollow directional repair device can all move forward through the top support forward mechanism, avoiding large-scale excavation of the building during the grouting process and ensuring the overall integrity of the building.

[0018] 4. The existing building foundation hollow directional repair device in this application adopts a drill bit deflection mechanism to adjust the drilling direction of the drill bit, so that the grouting direction can be effectively controlled and the hollow problem part can be effectively repaired. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded structural diagram of the directional repair device for hollow foundations of existing buildings according to an embodiment of this application;

[0021] Figure 2 This is an external view of the drill bit power section in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0022] Figure 3 This is a front sectional view of the drill bit power unit in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0023] Figure 4 This is a side sectional view of the drill bit power unit in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0024] Figure 5 This is a diagram showing the state of the drill bit after shrinkage in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0025] Figure 6 This is a schematic diagram of the drill bit retraction mechanism in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0026] Figure 7 This is a schematic diagram of the first pull-wire moving mechanism in the directional repair device for hollow foundations of existing buildings according to an embodiment of this application;

[0027] Figure 8This is a schematic diagram of the top support advancing mechanism in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0028] Figure 9 This is an external view of the grouting pipe section in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0029] Figure 10 This is a cross-sectional view of a grouting pipe section in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0030] Figure 11 This is a schematic diagram of the first direction positioning mechanism in the directional repair device for hollow foundations of existing buildings according to an embodiment of this application;

[0031] Figure 12 This is a schematic diagram of the grouting plate in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0032] Figure 13 This is an external view of the connecting pipe section in the directional repair device for hollow foundations of existing buildings according to an embodiment of this application;

[0033] Figure 14 This is a cross-sectional view of the connecting pipe section in the directional repair device for hollow foundations of existing buildings, as described in this application embodiment.

[0034] Figure 15 This is a schematic diagram showing the connection between the existing building foundation hollow directional repair device and the power supply unit in an embodiment of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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 application 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, they should not be construed as limitations on this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, as fixed connection, detachable connection, or integral connection; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] Reference Figure 1 and Figure 2 The embodiments of this application provide a directional repair device for hollow foundations of existing buildings, including a drill bit power unit 1, one or more grouting pipe sections 2 and multiple connecting pipe sections 3 connected in series along the axial direction.

[0040] Reference Figures 2 to 8 The drill bit power unit 1 includes a first housing assembly 11 and a drill bit 12, a drill bit drive mechanism 13, a drill bit retraction mechanism 14, a drill bit deflection mechanism 15, and a first support forward mechanism 16 disposed within the first housing assembly 11. The upper end of the first housing assembly 11 is provided with a first connecting lock 19 for connecting adjacent pipe sections.

[0041] The first outer casing assembly 11 includes a first upper casing 111, a conical intermediate sleeve 112, a first lower casing 113, and a mud swirl sleeve 114 connected in series along the axial direction. The mud swirl sleeve 114 has a stepped hole. The diameter of the first lower casing 113 is smaller than the diameter of the first upper casing 111. Two first power and signal transmission lines 17 are provided on the side wall of the first upper casing 111, and the lower ends of the first power and signal transmission lines 17 are connected to the conical intermediate sleeve 112. Two first mud conveying pipes 18 are provided on the side walls of the first upper casing 111 and the conical intermediate sleeve 112, and the lower ends of the first mud conveying pipes 18 are connected to the mud swirl sleeve 114.

[0042] The drill bit drive mechanism 13 includes a power transmission rod 131 with a drive motor. The lower end of the power transmission rod 131 with the drive motor is connected to the drill bit 12, and the power transmission rod 131 with the drive motor can drive the drill bit 12 to rotate.

[0043] The drill bit retraction mechanism 14 includes two sets of lifting assemblies 141 arranged axially symmetrically with respect to the power transmission rod 131 with a drive motor. Each set of lifting assemblies 141 includes a lifting motor 142, a fixing member 143, a spring 144, a transmission rod 145, a lifting rack 146, and two lifting gears 147. The fixing member 143 is fixed to the conical intermediate sleeve 112, and the two ends of the spring 144 are respectively connected to the fixing member 143 and the lifting motor 142. The two lifting gears 147 are both connected to the output shaft of the lifting motor 142 through the transmission rod 145, and the lifting rack 146 is arranged vertically on the outer wall of the power transmission rod 131 with the drive motor. Thus, the drill bit retraction mechanism 14 can drive the drill bit 12 to retract into the first housing assembly 11.

[0044] There are four drill bit deflection mechanisms 15, which are evenly distributed around the circumference of the power transmission rod 131 with the drive motor. Each drill bit deflection mechanism 15 includes a deflection stabilizing ring 151 and a first wire pulling mechanism 152. The side wall of the power transmission rod 131 is provided with a groove (not shown in the figure), and the inner wall of the deflection stabilizing ring 151 is provided with a slider. Thus, the deflection stabilizing ring 151 is slidably connected to the outer wall of the power transmission rod 131 with the drive motor and is located on the upper end face of the conical intermediate sleeve 112. The deflection stabilizing ring 151 is connected to the conical intermediate sleeve 112 through an elastic element (not shown in the figure). The first wire pulling mechanism 152 includes a steel strand tensioning and contraction motor 153, a steel strand 154, a steel strand spring 155, an upper fixing block 156, and a lower fixing block 157. The upper fixing block 156 is connected to the inner wall of the first upper shell 111, and the lower fixing block 157 is connected to the outer side of the deflection stabilizing ring 151. The fixed end of the tensioning and contraction motor 153 for the steel strand 154 is connected to the lower fixed block 157, and the output end is connected to the first end of the steel strand 154. The second end of the steel strand 154 is connected to the upper fixed block 156, and the steel strand spring 155 is sleeved on the steel strand 154. Thus, the drill bit deflection mechanism 15 can adjust the drilling direction of the drill bit 12.

[0045] The first support advancing mechanism 16 includes four support shoes 161 evenly distributed circumferentially on the first lower shell 113, and a second cable moving mechanism 162 and a third cable moving mechanism 163 disposed between the support shoes 161 and the first lower shell 113. The structures of the second cable moving mechanism 162 and the third cable moving mechanism 163 are the same as those of the first cable moving mechanism 152. The upper fixing block of the second cable moving mechanism 162 is connected to the upper end of the outer wall of the first lower shell 113, and the lower fixing block is connected to the middle of the inner wall of the support shoes 161. The upper fixing block of the third cable moving mechanism 163 is connected to the middle of the inner wall of the support shoes 161, and the lower fixing block is connected to the lower end of the outer wall of the first lower shell 113. Thus, the first support advancing mechanism 16 can drive the drill bit drive mechanism 13, the drill bit retraction mechanism 14, and the drill bit deflection mechanism 15 forward.

[0046] Reference Figures 9 to 12 The grouting pipe section 2 includes a second outer shell assembly 21 and a first grouting pipe 22 disposed within the second outer shell assembly 21. The upper end of the second outer shell assembly 21 is provided with a second connecting latch (not shown in the figure).

[0047] The second outer casing assembly 21 includes a second upper casing 211, a first intermediate casing 212, and a grouting plate 213 connected in series along the axial direction. The diameter of the first intermediate casing 212 is smaller than the diameter of the second upper casing 211 and the grouting plate 213. Two second mud conveying pipes 23 and two second power and signal transmission lines 24 are provided inside the side wall of the second outer casing assembly 21.

[0048] Specifically, the middle of the second mud conveying pipe 23 and the second power and signal transmission line 24 are both located outside the first intermediate shell 212. A second supporting forward mechanism 25 is provided on the outside of the first intermediate shell 212, and the structure of the second supporting forward mechanism 25 is the same as that of the first supporting forward mechanism 16.

[0049] The grouting plate 213 has four radially distributed grouting holes 214 and through holes for the second slurry conveying pipe 23 and the second power and signal transmission line 24 to pass through. The bottom surface of the radial grouting holes 214 also has a vertical grouting hole 215 that communicates with the inner cavity of the adjacent first grouting pipe 22 located below. It should be noted that the second power and signal transmission line 24 is sealed to the through hole by a sealing element 26. When there is only one grouting pipe section 2, the vertical grouting hole 215 in the grouting pipe section 2 can be blocked before operation. When there are multiple grouting pipe sections 2, the vertical grouting hole 215 in the bottommost grouting pipe section 2 can be blocked before operation.

[0050] The space between the second outer casing assembly 21 and the first grouting pipe 22 is filled with a first rubber filler 27, within which four first-direction positioning mechanisms 28 are provided. The first-direction positioning mechanisms 28 are connected to a second power and signal transmission line 24. The second power and signal transmission line 24 can transmit the slope value collected by the first-direction positioning mechanisms 28 to an external control unit. Specifically, the first-direction positioning mechanism 28 includes an upper power signal transmission rod 281, a conductive metal ring 282, an electrical signal transmission line 283, a gravity-induced drooping guide inductor 284, and a lower power signal transmission rod 285. The lower end of the upper power signal transmission rod 281 is connected in series with the electrical signal transmission line 283 and the gravity-induced drooping guide inductor 284. The upper end of the lower power signal transmission rod 285 is connected to the conductive metal ring 282. The gravity-induced drooping guide inductor 284 can slide on the conductive metal ring 282.

[0051] It should be noted that the first rubber filler 27 is divided into upper and lower parts, forming an annular cavity 29 in the middle. The upper electrical signal transmission rod 281 is located inside the upper part of the first rubber filler 27, and the lower electrical signal transmission rod 285 is located inside the lower part of the first rubber filler 27. The conductive metal ring 282, the electrical signal transmission line 283, and the gravity-driven guide inductor 284 are all located inside the annular cavity 29. The electrical signal transmission line 283 is connected to the second power and signal transmission line 24. It should be noted that the principle of the first direction positioning mechanism 28 is similar to that of existing inclinometers, and will not be described in detail here.

[0052] Reference Figure 13 and Figure 14 The connecting pipe section 3 is similar in structure to the grouting pipe section 2, except that the connecting pipe section 3 uses a fixed sleeve instead of a grouting plate 213, and the fixed sleeve does not have radial grouting holes 214.

[0053] Specifically, the connecting pipe section 3 includes a third housing assembly 31 and a second grouting pipe 32 disposed within the third housing assembly 31. The upper end of the third housing assembly 31 is provided with a third connecting latch (not shown in the figure).

[0054] The third outer casing assembly 31 includes a third upper casing 311, a second intermediate casing 312, and a fixing sleeve 313 connected in series along the axial direction. The diameter of the second intermediate casing 312 is smaller than the diameters of the third upper casing 311 and the fixing sleeve 313. Two third mud conveying pipes 33 and two third power and signal transmission lines 34 are provided inside the side wall of the third outer casing assembly 31. Specifically, the middle portions of the third mud conveying pipes 33 and the third power and signal transmission lines 34 are located outside the second intermediate casing 312. A third supporting and advancing mechanism 35 is provided outside the second intermediate casing 312. The structure of the third supporting and advancing mechanism 35 is the same as that of the first supporting and advancing mechanism 16, and will not be described in detail here.

[0055] The third outer casing assembly 31 and the second grouting pipe 32 are filled with a second rubber filler 37, and four second-direction positioning mechanisms 38 are provided inside the second rubber filler 37. The second-direction positioning mechanisms 38 are connected to the third power and signal transmission line 34. The structure of the second-direction positioning mechanism 38 is the same as that of the first-direction positioning mechanism 28, and will not be described in detail here.

[0056] It should be noted that, after the embodiments of this application are assembled, the first direction positioning mechanism 28 and the second direction positioning mechanism 38 are connected as a whole. The first power and signal transmission line 17, the second power and signal transmission line 24 and the third power and signal transmission line 34 are connected as a whole. The first mud conveying pipe 18, the second mud conveying pipe 23 and the third mud conveying pipe 33 are connected as a whole.

[0057] Refer to 1 to Figure 15The embodiments of this application are based on the working principle of the above-mentioned existing building foundation hollow directional repair device as follows:

[0058] After determining the entry point 5, the drill bit power unit 1, grouting pipe section 2, and connecting pipe section 3 are connected in sequence, and the power supply unit 4 is turned on to supply power to the drill bit power unit 1. The drill bit 12, mud swirl sleeve 114, first support forward mechanism 16, and power transmission rod 131 with drive motor in the drill bit power unit 1 begin to work, and at the same time, the mud circulates through the first mud delivery pipe 18, the second mud delivery pipe 23, and the third mud delivery pipe 33.

[0059] Once the drill bit 12 enters the soil layer, the drill bit deflection mechanism 15 begins to operate. The position of the directional drill is transmitted back via power and signal transmission lines, and is corrected by four identical drill bit deflection mechanisms 15. Then, the first jacking advance mechanism 16 begins to operate, and after the jacking stabilizes, it pushes the drill bit forward.

[0060] When the drill bit power unit 1 is fully inserted into the soil, it supplies power to the grouting pipe section 2. At the same time, the drill bit power unit 1 continues to push and drill forward, which plays a traction role on the grouting pipe section 2. When the four identical second jacking and advancing mechanisms 25 of the grouting pipe section 2 enter the soil layer and start working, they can play a jacking role on the grouting pipe section 2 and drive the connecting pipe section 3 to move.

[0061] Once the grouting pipe section 2 has fully entered the soil, power is supplied to the connecting pipe section 3. At the same time, the grouting pipe section 2 continues to push and drill forward, which provides traction for the subsequent connecting pipe section 3. When the four identical fourth jacking and advancing mechanisms of the connecting pipe section 3 enter the soil layer, they begin to work, which provides jacking for the connecting pipe section 3 and drives the subsequent connecting pipe section 3 to move.

[0062] Based on the required distance for foundation voids, the distance of the grouting pipe section can be selectively increased by adding connecting pipe section 3.

[0063] The first directional positioning mechanism 28 and the second directional positioning mechanism 38 position the drill bit by comparing the electrical signals of the spherical part of the electrical signal transmission line 283, the gravity-drained conductive rod, the upper signal transmission rod, and the lower signal transmission rod inside two adjacent connecting pipe sections 3. The gravity-drained conductive rod moves on the conductive metal ring 282 through the electrical signal transmission line 283 according to gravity to generate a signal. Combined with the position feedback data of the drill bit power part 1, the specific orientation of the entire directional drilling can be effectively understood.

[0064] When the sizing drill reaches the designated hollow position 6 in the foundation, the lifting motor 142 drives the lifting gear 147 to rotate, thereby causing the lifting rack 146, the power transmission rod 131 with the drive motor, and the drill bit 12 to retract into the first housing assembly 11. After the drill bit 12 has retracted, the grouting material, namely the grouting filler and water glass, is introduced into the grouting pipe section 2 through the connecting pipe section 3. The grouting material in the grouting pipe section 2 flows out from the radial grouting holes 214 on the grouting plate 213, and the grouting begins.

[0065] On the other hand, embodiments of this application also provide a repair method based on the above-mentioned directional repair device for hollow foundations of existing buildings, including the following steps:

[0066] Step 1: Develop a path based on the known information about building hollowness.

[0067] Step 2: Connect and install the drill bit power unit 1, grouting pipe section 2, and connecting pipe section 3, and start drilling. It should be noted that the connecting pipe section 3 can be appropriately extended according to the length of the specific route, and the number of grouting pipe sections 2 can be increased as needed.

[0068] Step 3: Based on the data transmitted through the first, second, and third power and signal transmission lines, obtain the positions of the drill bit power unit 1, grouting pipe section 2, and connecting pipe section 3, and adjust the deflection position of the drill bit 12 according to these positions. It should be noted that the positions of the grouting pipe section 2 and connecting pipe section 3 are obtained by comparing the positions of the first direction positioning mechanism 28 or the second direction positioning mechanism 38 inside two adjacent connecting pipe sections.

[0069] Step 4: After reaching the hollow area of ​​the foundation, the drill bit retraction mechanism 14 retracts the drill bit 12 into the first outer casing assembly 11;

[0070] Step 5: Perform grouting according to technical requirements;

[0071] Step 6: After grouting is completed, the drill bit power section 1, grouting pipe section 2, and connecting pipe section 3 are gradually retracted to complete the directional repair of the hollow area in the foundation of the existing building.

[0072] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A directional repair device for hollow foundations of existing buildings, characterized in that, The system comprises a drill bit power unit, a grouting pipe section, and multiple connecting pipe sections connected in series along the axial direction. The drill bit power unit includes a first housing assembly and a drill bit, a drill bit drive mechanism, a drill bit retraction mechanism, a drill bit deflection mechanism, and a first support forward mechanism disposed within the first housing assembly. The drill bit drive mechanism can drive the drill bit to rotate. The drill bit retraction mechanism can drive the drill bit to retract into the first housing assembly. The drill bit deflection mechanism can adjust the drilling direction of the drill bit. The first support forward mechanism can drive the drill bit drive mechanism, the drill bit retraction mechanism, and the drill bit deflection mechanism forward. A first directional positioning mechanism is provided within each grouting pipe section. A second directional positioning mechanism is provided within each connecting pipe section. The first outer shell assembly includes a first upper shell, a conical intermediate sleeve, a first lower shell, and a mud swirl sleeve connected in series along the axial direction; the diameter of the first lower shell is smaller than the diameter of the first upper shell; a first power and signal transmission line is provided on the side wall of the first upper shell; the lower end of the first power and signal transmission line is connected to the conical intermediate sleeve; a first mud conveying pipe is provided on the side walls of the first upper shell and the conical intermediate sleeve, and the lower end of the first mud conveying pipe is connected to the mud swirl sleeve; The drill bit drive mechanism includes a power transmission rod with a drive motor; the lower end of the power transmission rod with the drive motor is connected to the drill bit, and the power transmission rod with the drive motor can drive the drill bit to rotate. The drill bit retraction mechanism includes two sets of lifting assemblies arranged symmetrically with respect to the power transmission rod with the drive motor. Each lifting assembly includes a lifting motor, a transmission rod, a lifting rack, and two lifting gears. The lifting motor is floatingly connected to the conical intermediate sleeve. Both lifting gears are connected to the output shaft of the lifting motor via the transmission rod. The lifting rack is arranged vertically on the outer wall of the power transmission rod with the drive motor.

2. The directional repair device for hollow foundations of existing buildings according to claim 1, characterized in that, The drill bit deflection mechanism comprises multiple mechanisms, which are evenly distributed circumferentially along the power transmission rod with the drive motor. Each drill bit deflection mechanism includes a deflection stabilizing ring and a first pull-wire moving mechanism. The deflection stabilizing ring is fixedly connected to the outer wall of the power transmission rod with the drive motor and is located on the upper end face of the conical intermediate sleeve. The deflection stabilizing ring is connected to the conical intermediate sleeve through an elastic element. The protruding end of the first pull-wire moving mechanism is connected to the inner wall of the first upper shell, and the fixed end is connected to the outer side of the deflection stabilizing ring.

3. The directional repair device for hollow foundations of existing buildings according to claim 2, characterized in that, The first wire pulling and moving mechanism includes a steel strand stretching and contracting motor, a steel strand, a spring, an upper fixing block, and a lower fixing block; the fixed end of the steel strand stretching and contracting motor is connected to the lower fixing block, the output end is connected to the first end of the steel strand being wound, the second end of the steel strand is connected to the upper fixing block, and the spring is sleeved on the steel strand; the upper fixing block is connected to the inner wall of the first upper shell, and the lower fixing block is connected to the outer side of the deflection stabilizing ring.

4. The directional repair device for hollow foundations of existing buildings according to claim 2, characterized in that, The first support forward mechanism includes multiple support boots evenly distributed circumferentially on the first lower shell, and a second and a third pull-wire moving mechanism disposed between the support boots and the first lower shell; the upper fixing block of the second pull-wire moving mechanism is connected to the upper end of the outer wall of the first lower shell, and the lower fixing block is connected to the middle part of the inner wall of the support boot; the upper fixing block of the third pull-wire moving mechanism is connected to the middle part of the inner wall of the support boot, and the lower fixing block is connected to the lower end of the outer wall of the first lower shell.

5. The directional repair device for hollow foundations of existing buildings according to claim 1, characterized in that, The grouting pipe section includes a second outer shell assembly and a first grouting pipe disposed within the second outer shell assembly; a second slurry conveying pipe and a second power and signal transmission line are provided inside the side wall of the second outer shell assembly; a first rubber filler is filled between the second outer shell assembly and the first grouting pipe, and a first directional positioning mechanism is provided inside the first rubber filler; the first directional positioning mechanism is connected to the second power and signal transmission line; the second outer shell assembly includes a second upper shell, a first intermediate shell, and a grouting plate; the diameter of the first intermediate shell is smaller than the diameter of the second upper shell and the grouting plate; a second supporting forward mechanism is provided outside the first intermediate shell; the structure of the second supporting forward mechanism is the same as the structure of the first supporting forward mechanism.

6. The directional repair device for hollow foundations of existing buildings according to claim 1, characterized in that, The connecting pipe section includes a third outer shell assembly and a second grouting pipe disposed within the third outer shell assembly; a third slurry conveying pipe and a third power and signal transmission line are provided inside the side wall of the third outer shell assembly; a second rubber filler is filled between the third outer shell assembly and the second grouting pipe, and a second directional positioning mechanism is provided inside the second rubber filler; the second directional positioning mechanism is connected to the third power and signal transmission line; the third outer shell assembly includes a third upper shell, a second intermediate shell, and a fixing sleeve; the diameter of the second intermediate shell is smaller than the diameter of the third upper shell and the fixing sleeve; a third supporting and advancing mechanism is provided outside the second intermediate shell, and the structure of the third supporting and advancing mechanism is the same as the structure of the first supporting and advancing mechanism.

7. A repair method based on the directional repair device for hollow foundations of existing buildings according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Path planning is performed based on the known information about building hollowness. S2. Connect and install the drill bit power unit, grouting pipe section, and connecting pipe section, and begin drilling; S3. Obtain the positions of the drill bit power unit, grouting pipe section and connecting pipe section, and adjust the deflection position of the drill bit according to the positions of the drill bit power unit, grouting pipe section and connecting pipe section; S4. After reaching the hollow area of ​​the foundation, the drill bit retraction mechanism retracts the drill bit into the first housing assembly; S5. Grouting shall be carried out in accordance with technical requirements; S6. After grouting is completed, the drill bit power unit, grouting pipe section, and connecting pipe section gradually retract to complete the directional repair of the hollow area in the foundation of the existing building.

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