Modular retrofitting device and method for existing building foundations

Abstract

The application relates to the technical field of building foundation reinforcement, in particular to a modularized reinforcement device and method for existing building foundation, which comprises a support frame, a plurality of through holes are uniformly distributed in a matrix on the support frame, a traveling mechanism is arranged on the support frame, and the traveling direction of the support frame is sequentially provided with a pile driving part for driving a reinforcing pile into a reinforcing hole, and a grouting part for injecting cement slurry into the reinforcing hole; the pile driving part comprises a connecting frame arranged in the support frame, sliding grooves are symmetrically arranged at the two ends of the connecting frame, sliding blocks are slidably arranged in the sliding grooves, and a screw rod is rotatably arranged between the two sliding blocks; after grouting is completed, the reserved section of the reinforcing pile is slowly pressed down by a push rod, and the un-solidified slurry in the hole is extruded, which fills the hole bottom cavity on one hand and presses the slurry into the tiny pores of the foundation on the other hand, so that the reinforcing pile, the slurry and the foundation are integrated, the overall bearing capacity of the foundation is improved, and the cavity formed due to the un-exhausted air in the hole and the solidification shrinkage of the slurry is avoided.

Description

Technical Field

[0001] This application relates to the field of building foundation reinforcement technology, and in particular to a modular reinforcement device and method for existing building foundations. Background Technology

[0002] Existing buildings refer to all types of buildings or structures that have been completed and put into use, encompassing various types such as residences, office buildings, shopping malls, industrial plants, schools, and hospitals, ranging from low-rise houses to high-rise buildings. These buildings are often affected by factors such as changes in geological conditions (e.g., fluctuations in groundwater levels, soil consolidation), long-term loads (e.g., increased loads due to changes in building function), and initial foundation design defects, leading to problems such as decreased foundation bearing capacity, uneven foundation settlement, and slight building tilt. If not addressed promptly, these issues may affect structural safety and normal use, thus requiring targeted foundation reinforcement measures.

[0003] Modular reinforcement of existing building foundations is a technical means of foundation repair using standardized functional modules prefabricated in a factory and assembled and precisely controlled on-site. For example, application number 2024106443187 describes a foundation reinforcement and repair device and method, relating to the field of foundation reinforcement technology. This prior art includes a drilling rig used to drill holes in the foundation to form grouting holes; and a grouting mechanism used to inject mortar into the grouting holes and the foundation surrounding them. The grouting mechanism includes a grouting pipe that can be vertically inserted into the grouting hole; multiple telescopic pipes that are elastic and evenly distributed around the grouting pipe; and an extrusion head located at the end of the telescopic pipe extending out of the grouting pipe. By using the telescopic pipe and extrusion head, during grouting, the extrusion head and telescopic pipe can be inserted laterally into the foundation around the grouting pipe, reinforcing the foundation around the grouting hole and improving the scope and effectiveness of foundation reinforcement.

[0004] However, the aforementioned existing technologies still have some shortcomings when it comes to reinforcing building foundations:

[0005] The aforementioned existing technology involves drilling several grouting holes in the foundation using a drilling rig, injecting mortar into the grouting pipe, and under the pressure of the mortar, the extrusion head drives the telescopic pipe to be inserted horizontally into the foundation around the grouting hole, and the telescopic pipe is filled with mortar to achieve reinforcement.

[0006] When the extrusion head is inserted laterally, soft soil is prone to plastic flow due to extrusion, causing the insertion path of the expansion tube to deviate, making it impossible to form radial reinforcement bars in the designed position. It may even cause local heave of the surrounding foundation due to the lateral displacement of soft soil. Secondly, soft soil has poor mortar encapsulation. After grouting, the mortar is prone to separate from the soft soil. The bonding strength between the lateral expansion tube and the foundation is insufficient. When subjected to building loads later, the reinforcement bars are prone to detach from the soft soil and cannot effectively transfer the load.

[0007] During the pipe removal stage, the grouting pipe needs to be pulled upwards to allow the fixing ring to detach from the baffle along the inclined surface. However, in actual operation, the grouting pipe is prone to disturbing the incompletely solidified mortar (especially the mortar inside the transverse expansion pipe), causing air bubbles or cracks to form inside the mortar, thus reducing the reinforcement strength.

[0008] Based on this, and given the above viewpoints, there is still room for improvement in existing technologies for reinforcing building foundations. Summary of the Invention

[0009] To address the aforementioned technical problems, this application provides a modular reinforcement device and method for existing building foundations, employing the following technical solution:

[0010] Firstly, a modular reinforcement device for existing building foundations includes a support frame with a plurality of through holes evenly distributed in a matrix on the support frame. The through holes are arranged in several rows with adjacent rows of through holes at equal intervals, and several through holes are evenly distributed in each row. A traveling mechanism is provided on the support frame, and the multiple rows of through holes are arranged sequentially on the side opposite to the traveling direction of the support frame:

[0011] Drilling components used to drill through holes in corresponding rows and to drill holes in the foundation to form reinforcement holes;

[0012] A pile driver used to pass through corresponding rows of through holes and drive reinforcing piles into the reinforcement holes of the foundation;

[0013] Grouting components used to drill through holes in corresponding rows and inject cement grout into the reinforcement holes of the foundation;

[0014] The pile driver includes a connecting frame set inside the support frame. The connecting frame has symmetrical sliding grooves at both ends. Sliding blocks are symmetrically and slidably set inside the sliding grooves. A lead screw is rotatably set between two corresponding sliding blocks on both sides. Each lead screw is equipped with a roller that corresponds to a through hole in the same row. A V-shaped groove is set on the roller that is located directly above the through hole.

[0015] Preferably, multiple rotating rings are rotatably arranged on the lead screw, and a guide rod is provided on one side of the rotating ring. One end of the guide rod slides through the connecting frame, and a return spring is provided between the connecting frame and the rotating ring. The return spring is sleeved on the guide rod.

[0016] Preferably, connecting frames are symmetrically arranged on both sides of the connecting frame, and guide grooves are provided on the connecting frames. A guide plate is slidably arranged between the guide grooves of the two connecting frames. The guide plate is located directly above the through hole, and a lifting spring is provided at the lower end of the guide plate in the guide groove.

[0017] Preferably, the lower end of the guide plate is provided with a top post that corresponds to one of the through holes.

[0018] Preferably, winding wheels are symmetrically arranged on both sides of the lead screw, and guide ropes are wound on the two winding wheels corresponding to the same side of the two lead screws, with the guide ropes passing through the guide plate in the middle.

[0019] Preferably, the grouting component includes a connecting pipe provided on one side of the support frame, the connecting pipe corresponding to a row of through holes, a telescopic pipe slidably provided inside the connecting pipe, the lower end of the telescopic pipe slidingly passing through the corresponding through hole, a limit ring provided on the telescopic pipe, and a clamping spring provided between the limit ring and the connecting pipe.

[0020] Preferably, a rubber ring is provided at the lower end of the telescopic tube;

[0021] A push rod is slidably inserted through the connecting pipe, and a gear that is threadedly connected to the push rod is rotatably installed on the connecting pipe.

[0022] Preferably, the drilling component includes support frames symmetrically arranged on both sides of the through hole, a sliding plate slidably arranged between the two support frames, a screw rotatably arranged on the support frame, the screw being threadedly connected to the sliding plate, and a detachable drill bit arranged on the sliding plate, the drill bit being located directly above the corresponding through hole.

[0023] Preferably, the traveling mechanism includes horizontal plates that slide on both sides of the support frame, and guide wheels are provided on the horizontal plates.

[0024] Secondly, a modular reinforcement method for existing building foundations, the application of which includes the following steps:

[0025] Step 1: Drilling preparation. Start the motor of the drilling unit to drive the drill bit on the sliding plate to rotate. At the same time, rotate the screw on the support frame synchronously. Through the threaded transmission, drive the sliding plate to move slowly vertically downward along the support frame. The drill bit moves down with the sliding plate, passes through the first row of through holes in the support frame, and then drills vertically into the foundation.

[0026] Step 2: Positioning and positioning. The traveling mechanism pushes the support frame to move along a preset direction (such as parallel to the building foundation). The moving distance is strictly controlled to be the spacing between two adjacent rows of through holes (one workstation). The through hole row corresponding to the pile driver is aligned with the first row of reinforcement holes, and the through hole row corresponding to the drilling driver is aligned with the next area to be drilled.

[0027] Step 3: Pile driving preparation. Place the precast reinforced piles one by one into the V-shaped grooves corresponding to the two lead screws of the pile driving component. The return spring pushes the lead screws and sliders closer to each other. The rollers automatically clamp the reinforced piles through the V-shaped grooves. At the same time, the top column at the lower end of the guide plate is in contact with the top of the reinforced pile to ensure that the reinforced pile is perpendicular to the ground.

[0028] Step 4: Reinforce the pile driving, start the traveling mechanism, and push the support frame to move one position again. Align the through hole row corresponding to the grouting component with the first row of reinforced holes that have been driven into the pile, align the through hole row corresponding to the pile driving component with the second row of reinforced holes that have just been completed by the drilling component, and align the through hole row corresponding to the drilling component with the third area to be drilled.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. After grouting is completed, this invention uses a push rod to slowly press down on the reserved section of the reinforced pile, squeezing out the uncured grout inside the hole. This fills the voids at the bottom of the hole and forces the grout into the tiny pores of the foundation, making the reinforced pile, grout, and foundation integrated, thus improving the overall bearing capacity of the foundation. This avoids the formation of voids due to incomplete air removal from the hole or the shrinkage of the grout upon curing.

[0031] 2. This invention achieves multi-point uniform pile addition on soft soil foundations through the through holes distributed in the support frame matrix. Each row of reinforcing piles is arranged at equal intervals. Multiple reinforcing piles can jointly constrain the plastic flow of the surrounding soft soil. When the soft soil is compressed, it will be blocked by the adjacent reinforcing piles and cannot deviate significantly in a single direction, thus avoiding the problem of "path deviation similar to that of telescopic pipe insertion in existing technologies" from the root. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a cross-sectional view of the connecting frame of the present invention.

[0034] Figure 3 This is a plan view of the connecting frame of the present invention.

[0035] Figure 4 This is a schematic diagram of the structure of the pile driver of the present invention.

[0036] Figure 5 This is the present invention. Figure 4 Enlarged view of a portion of point A in the middle.

[0037] Figure 6 This is a schematic diagram of the structure between the connecting frame and the grouting component of the present invention.

[0038] Figure 7 This is a schematic diagram of the grouting component of the present invention.

[0039] Figure 8 This is a cross-sectional view of the grouting component of the present invention.

[0040] Figure 9 This is a schematic diagram of the drilling component of the present invention.

[0041] Figure 10 This is a schematic diagram of the traveling mechanism of the present invention.

[0042] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Through hole; 3. Pile driver; 31. Connecting frame; 311. Sliding groove; 312. Slider; 32. Lead screw; 33. Roller; 331. V-groove; 34. Rotary ring; 341. Guide rod; 342. Return spring; 35. Connecting frame; 351. Guide groove; 36. Guide plate; 361. Lifting spring; 37. Top column; 38. Winding wheel; 39. Guide rope; 4. Grouting component; 41. Connecting pipe; 42. Telescopic pipe; 43. Limiting ring; 44. Pressing spring; 45. Rubber ring; 46. Push rod; 47. Gear; 5. Drilling component; 51. Support frame; 52. Sliding plate; 53. Screw; 54. Drill bit; 6. Traveling mechanism; 61. Horizontal plate; 62. Guide wheel. Detailed Implementation

[0043] The following is in conjunction with the appendix Figures 1 to 10 This application will be described in further detail.

[0044] This application discloses a modular reinforcement device and method for existing building foundations. Through precise displacement of the traveling mechanism, the drilling, pile driving, and grouting modules are operated in sequence. After grouting, the reserved section is compacted to achieve modular reinforcement of existing building foundations.

[0045] Reference Figure 1 , Figure 2 and Figure 3 As shown, a modular reinforcement device for existing building foundations includes a support frame 1. The support frame 1 has several through holes 2 evenly distributed in a matrix. The through holes 2 are arranged in several rows with adjacent rows of through holes 2 at equal intervals. Each row has several through holes 2 evenly distributed. The support frame 1 is provided with a traveling mechanism 6. Drilling components 5, pile inserting components 3 and grouting components 4 are arranged sequentially on the side of the multiple rows of through holes 2 away from the traveling direction of the support frame 1.

[0046] Before construction, the initial placement position of the support frame 1 is determined based on the extent of the existing building foundation defects (such as areas with insufficient bearing capacity or weak settlement areas) and the reinforcement design requirements. The first row of through holes 2 on the support frame 1 (corresponding to the working row of drilling parts 5) is aligned with the first working area of ​​the foundation to be reinforced.

[0047] During construction, the drilling component 5 (such as a hydraulically driven auger or impact drill) is started. The drilling component 5 drills vertically downward along the corresponding row of through holes 2. The drilling component 5 will pass through the corresponding row of through holes 2 and drill holes in the foundation to form reinforcement holes. During the drilling process, the through holes 2 play a guiding role to prevent the drilling component 5 from deviating and to ensure that reinforcement holes with the diameter and depth in the foundation are formed in accordance with the design requirements. After all the foundation positions corresponding to the first row of through holes 2 have been drilled (forming the first row of reinforcement holes), the drilling component 5 stops working and is retracted upward, separating from the foundation and through holes 2.

[0048] Afterwards, the traveling mechanism 6 drives the support frame 1 to move along a preset direction (such as parallel to the building foundation). The moving distance is strictly controlled to be the spacing between two adjacent rows of through holes 2 (i.e., one work station). After the shift is completed, the traveling mechanism 6 is locked and the support frame 1 remains stable. At this time, the two rows of through holes that originally corresponded to the pile driver 3 are aligned with the first row of reinforcement holes formed by the previous drilling stage. The two rows of through holes that originally corresponded to the drilling driver 5 are moved to the foundation area to be drilled next.

[0049] The pile driver 3 (such as a hydraulic pile driver or static pressure pile hammer) is started. The pile driver 3 is used to pass through the corresponding row of through holes 2 and drive the reinforcement piles into the reinforcement holes of the foundation. The pile driver 3 operates vertically downward along the corresponding row of through holes 2 to drive the prefabricated reinforcement piles (such as reinforced concrete piles or steel piles) into the first row of reinforcement holes formed in the previous stage. The vertical bearing capacity of the reinforcement piles makes up for the bearing capacity gap of the foundation.

[0050] The traveling mechanism 6 starts again, driving the support frame 1 to move one position (the distance between two adjacent rows of through holes 2); after the position is locked, the two rows of through holes that originally corresponded to the grouting component 4 are aligned with the first row of reinforcement holes that were completed by the previous stage pile driver 3, the two rows of through holes that originally corresponded to the pile driver 3 are aligned with the second row of reinforcement holes that were just completed by the drilling component 5, and the two rows of through holes that originally corresponded to the drilling component 5 are moved to the third drilling area.

[0051] When the grouting component 4 (such as a high-pressure grouting pump or a nozzle with a grouting pipe) is activated, the grouting component 4 will penetrate through the corresponding row of through holes 2 and inject cement grout into the reinforcement holes of the foundation. The grouting component 4 extends the grouting pipe into the first row of reinforcement holes along the corresponding row of through holes 2 (the grouting pipe needs to extend to the bottom of the hole), injecting cement grout into the gap between the reinforcement hole and the reinforcement pile, as well as the foundation pores around the reinforcement hole. The grout fills from the bottom of the hole upwards, ensuring that the gap is filled and there are no voids. At the same time, the grout penetrates into the surrounding foundation soil, which can improve the soil density and enhance the cooperative stress-bearing capacity of the foundation and the reinforcement pile.

[0052] Through the through holes 2 distributed in the support frame 1 matrix, multi-point uniform pile addition is achieved on the soft soil foundation: each row of reinforcing piles is arranged at equal intervals, and multiple reinforcing piles can jointly constrain the plastic flow of the surrounding soft soil. When the soft soil is squeezed, it will be blocked by the adjacent reinforcing piles and cannot deviate in a large amount in a single direction, thus avoiding the problem of insertion path deviation from the root.

[0053] Reference Figure 4 and Figure 5 As shown, specifically, the pile driver 3 includes a connecting frame 31 set inside the support frame 1. The connecting frame 31 has symmetrical sliding grooves 311 at both ends. Sliding blocks 312 are symmetrically and slidably set inside the sliding grooves 311. A lead screw 32 is rotatably set between the two corresponding sliding blocks 312 on both sides. Each of the two lead screws 32 is equipped with a roller 33 that corresponds one-to-one with the through holes 2 in the same row. A V-shaped groove 331 located directly above the through hole 2 is opened on the roller 33.

[0054] Multiple rotating rings 34 are rotatably mounted on the lead screw 32. A guide rod 341 is provided on one side of the rotating ring 34. One end of the guide rod 341 slides through the connecting frame 31. A return spring 342 is provided between the connecting frame 31 and the rotating ring 34, and the return spring 342 is sleeved on the guide rod 341. The elastic force of the return spring 342 will push the rotating ring 34 to move towards the center of the connecting frame 31, thereby driving the lead screw 32 and the sliders 312 on both sides to move closer to each other along the sliding groove 311. At this time, the rollers 33 on the two lead screws 32 (corresponding one-to-one with the through holes 2 in the same row) also move closer to each other synchronously with the lead screws 32. The V-shaped groove 331 at the top of the roller 33 is in a ready state to clamp the reinforcement pile, and the central axis of the V-shaped groove 331 is completely coincident with the central axis of the through hole 2 of the lower support frame 1, ensuring that the subsequent reinforcement pile can be vertically aligned with the through hole 2.

[0055] Connecting frames 35 are symmetrically arranged on both sides of the connecting frame 31. Guide grooves 351 are provided on the connecting frames 35. A guide plate 36 is slidably arranged between the guide grooves 351 of the two connecting frames 35. The guide plate 36 is located directly above the through hole 2. A lifting spring 361 located in the guide groove 351 is provided at the lower end of the guide plate 36.

[0056] The guide plate 36 has a top post 37 at its lower end that corresponds to the through hole 2. On the connecting frame 35 on both sides of the connecting frame 31, the guide plate 36 slides vertically along the guide groove 351. The lifting spring 361 between the lower end of the guide plate 36 and the bottom of the guide groove 351 is in a "natural extension or slight pre-compression" state, so that the guide plate 36 is located on the upper part of the guide groove 351. The top post 37 at the lower end of the guide plate 36 corresponds to the through hole 2 and is directly facing the center of the V-shaped groove 331 of the lower roller 33. When the reinforcing pile is put into the V-shaped groove 331, the top post 37 will directly fit against the top of the reinforcing pile, forming a vertical alignment relationship between the top post 37, the reinforcing pile, and the V-shaped groove 331, ensuring that the reinforcing pile is perpendicular to the ground in the initial state.

[0057] Symmetrically arranged on both sides of the lead screw 32 are winding wheels 38. Guide ropes 39 are wound on the two winding wheels 38 on the same side of the two lead screws 32, and the guide ropes 39 pass through the guide plate 36 in the middle. That is, each lead screw 32 has winding wheels 38 fixed on both sides, and the winding wheels 38 on the same side of the two lead screws 32 (such as the left winding wheel 38 of the left lead screw 32 and the left winding wheel 38 of the right lead screw 32) share a guide rope 39. The middle section of the guide rope 39 passes through the guide plate 36 (it can be fixed by a hole or hook on the guide plate 36). In the initial state, the guide rope 39 is in a "slightly slack" state, which does not affect the initial position of the guide plate 36, nor does it restrict the slight movement of the lead screw 32.

[0058] During pile driving, the precast reinforced piles are placed one by one into the V-grooves 331 corresponding to the two lead screws 32 (each reinforced pile corresponds to a set of opposite V-grooves 331): Since the return spring 342 always pushes the lead screws 32 closer to each other, when the reinforced pile is placed into the V-grooves 331, the rollers 33 on both sides will automatically clamp the reinforced pile under the action of the spring force. The inclined structure of the V-grooves 331 can radially position the reinforced pile to prevent it from shifting to the left or right. At the same time, in conjunction with the top column 37 to limit the top of the reinforced pile, it is ensured that the reinforced pile remains perpendicular to the ground throughout the process, and the central axis is completely aligned with the through hole 2 of the support frame 1 below and the reinforcement hole of the foundation, which prepares the positioning for subsequent pile driving.

[0059] Start the piling drive mechanism (such as a motor driving the lead screw 32 to rotate, or manually drive the lead screw 32) to make the two lead screws 32 rotate relative to each other (i.e., the left lead screw 32 rotates clockwise and the right lead screw 32 rotates counterclockwise, or vice versa): When the lead screw 32 rotates, the winding wheels 38 on both sides will rotate synchronously with the lead screw 32. Since the winding wheels 38 on the same side of the two lead screws 32 are wrapped with the same guide rope 39 and the rotation direction is the same, the winding wheels 38 will synchronously wind the guide rope 39 onto the wheel body, so that the length of the guide rope 39 gradually shortens.

[0060] At this time, the tension of the guide rope 39 on the guide plate 36 is greater than the elastic force of the lifting spring 361, causing the guide plate 36 to slide vertically downward along the guide groove 351 of the connecting frame 35, while compressing the lifting spring 361 (the lifting spring 361 stores elastic potential energy when compressed, in preparation for subsequent reset).

[0061] As the guide plate 36 slides downward, the top column 37 at its lower end moves downward synchronously. Since the top column 37 is initially attached to the top of the reinforcing pile, and the reinforcing pile is clamped and positioned by the V-groove 331 of the roller 33, the top column 37 applies a vertical downward pressure to the reinforcing pile. Under the pressure of the top column 37, the reinforcing pile moves downward along the guide of the V-groove 331 (to avoid radial offset), first passing through the corresponding through hole 2 on the support frame 1, and then gradually entering the reinforcing hole in the foundation. At the same time, the rotation of the screw 32 will drive the roller 33 to rotate synchronously (rolling friction is generated at the contact point between the roller 33 and the reinforcing pile). On the one hand, this reduces the resistance to the downward movement of the reinforcing pile and avoids wear on the surface of the reinforcing pile. On the other hand, the rotation of the roller 33 further ensures that the reinforcing pile moves vertically downward and prevents it from tilting during the process of entering the hole.

[0062] When the reinforcing pile is driven to the designed depth (e.g., the top of the reinforcing pile is flush with the through hole 2 of the support frame 1, or completely enters the reinforcing hole), the drive screw 32 stops rotating. At this time, the winding wheel 38 stops winding the rope, the tension of the guide rope 39 on the guide plate 36 disappears, the compressed lifting spring 361 releases its elastic potential energy, and pushes the guide plate 36 to return vertically upward along the guide groove 351. The top column 37 also moves upward synchronously with the guide plate 36 and disengages from the top of the reinforcing pile. Subsequently, the drive screw 32 rotates in the opposite direction, causing the winding wheel 38 to rotate in the opposite direction to release the guide rope 39. At the same time, the screw 32 drives the slider 312 to move away from each other along the sliding groove 311 (overcoming the elastic force of the return spring 342). The roller 33 loosens its clamp on the reinforcing pile. Thus, the pile driver 3 completes one pile driving operation and waits for the next reinforcing pile to be loaded or the support frame 1 to be moved before driving the next row of piles.

[0063] Reference Figure 6 , Figure 7 and Figure 8 As shown, the grouting component 4 includes a connecting pipe 41 disposed on one side of the support frame 1. The connecting pipe 41 corresponds one-to-one with a row of through holes 2. A telescopic pipe 42 is slidably disposed inside the connecting pipe 41. The lower end of the telescopic pipe 42 slides through the corresponding through hole 2. A limit ring 43 is disposed on the telescopic pipe 42. A retaining spring 44 is disposed between the limit ring 43 and the connecting pipe 41. A rubber ring 45 is disposed at the lower end of the telescopic pipe 42.

[0064] After the piling work of the previous row of reinforcement holes is completed, the traveling mechanism 6 of the support frame 1 is started, driving the support frame 1 to move one position along the foundation surface (the distance is equal to the distance between two adjacent rows of through holes 2), so that the connecting pipe 41 and the telescopic pipe 42 corresponding to the grouting component 4 are precisely aligned with the reinforcement holes that have been piling in the previous stage. At this time, the support frame 1 has not yet moved down, and the telescopic pipe 42 is in the natural state of pressing against the spring 44 (slightly compressed). The lower end only passes through the through hole 2 of the support frame 1 a little bit and maintains a certain distance from the top of the reinforcement hole. The rubber ring 45 does not contact the ground or the edge of the reinforcement hole.

[0065] During the downward movement, the rubber ring 45 at the lower end of the telescopic tube 42 first contacts the ground (or the foundation surface around the reinforcement hole). Since the rubber ring 45 is made of elastic material, it will undergo slight deformation upon initial contact, initially adhering to the ground to prevent the telescopic tube 42 from shifting during subsequent downward movement. As the support frame 1 continues to move downward, the ground exerts an upward reaction force on the rubber ring 45. This reaction force is transmitted to the limiting ring 43 through the telescopic tube 42. At this time, the limiting ring 43 is subjected to an upward thrust, which begins to compress the clamping spring 44 sleeved on the outside of the telescopic tube 42 (the clamping spring 44 was originally in a slightly compressed state, and the compression gradually increases during the downward movement).

[0066] Under the combined action of reaction force and spring compression, the shrink tube slides upward relative to the connecting tube 41 (the connecting tube 41 moves down synchronously with the support frame 1, while the telescopic tube 42 moves down lagging behind due to ground resistance) until the support frame 1 moves down to the design height (usually when the lower end of the connecting tube 41 is close to the ground, or the lower end of the telescopic tube 42 is aligned with the entrance of the reinforcement hole), and the support frame 1 stops moving down.

[0067] After the support frame 1 stops moving downward, the clamping spring 44 begins to release its compressive potential energy, pushing the limit ring 43 to move downward, which in turn causes the telescopic tube 42 to extend downward along the connecting tube 41.

[0068] Under the spring thrust, the rubber ring 45 at the lower end of the telescopic tube 42 is precisely embedded in the reinforcement hole. Since the outer diameter of the rubber ring 45 is slightly larger than the inner diameter of the reinforcement hole, the rubber ring 45 will further deform during the embedding process and fit tightly against the inner wall of the reinforcement hole to form an annular sealing surface.

[0069] At this time, the limiting ring 43 maintains downward pressure on the telescopic tube 42 under the continuous action of the clamping spring 44, ensuring that the rubber ring 45 is always in close contact with the hole wall. Even if there are minor unevennesses in the inner wall of the reinforced hole (such as rough drilling surface), the elastic deformation of the rubber ring 45 can fill the gap and completely block the grout leakage channel during subsequent grouting.

[0070] After the piles are driven in, a small section of the reinforcing pile is usually left above the ground (for easy adjustment later). However, this reserved section may tilt or loosen due to slight foundation settlement or pile driving deviation. The push rod 46 is driven by gear 47 to press down and compact the reserved section to the designed height (such as flush with or slightly below the ground). At the same time, it ensures that the reinforcing pile is not loose in the reinforcing hole, preventing grout from overflowing from the gap between the reinforcing pile and the hole wall during subsequent grouting, or from the grouting channel being blocked due to the reinforcing pile offset.

[0071] A push rod 46 is slidably passed through the connecting pipe 41, and a gear 47 is rotatably provided on the connecting pipe 41 and threadedly connected to the push rod 46. The push rod 46 is located directly above the reinforced pile, and a small section above the ground is reserved when the reinforced pile is pressed down by the push rod 46.

[0072] After grouting is completed, the motor drives the gear 47. Since the gear 47 is threadedly engaged with the push rod 46, when the gear 47 rotates clockwise, the threaded transmission will drive the push rod 46 to slide vertically downward along the connecting pipe 41. The lower end of the push rod 46 gradually contacts the top of the reserved section of the reinforced pile. As the gear 47 continues to rotate, the push rod 46 will apply vertical downward pressure to the reserved section. The pressure can slowly press the reserved section into the reinforced hole until the top of the reinforced pile is flush with the ground (or reaches the design depth), completely eliminating the loosening or tilting of the reserved section.

[0073] During the lowering of the reserved section, the cement grout inside the hole will be squeezed. Under pressure, the grout flows towards the bottom of the reinforcement hole to fill any tiny voids that may exist at the bottom of the hole. On the other hand, it penetrates into the pores of the foundation around the reinforcement hole. In particular, it can improve the compactness of the foundation after penetrating the foundation due to the compression of the reinforcement pile during the pile driving.

[0074] Reference Figure 9 As shown, specifically, the drilling component 5 includes support frames 51 symmetrically arranged on both sides of the through hole 2, a sliding plate 52 slidably arranged between the two support frames 51, a screw 53 rotatably arranged on the support frame 51, the screw 53 being threadedly connected to the sliding plate 52, and a detachable drill bit 54 arranged on the sliding plate 52, the drill bit 54 being located directly above the corresponding through hole 2.

[0075] During drilling, the motor drives the drill bit 54 to rotate, which in turn drives the screw 53 to rotate. The threaded transmission drives the sliding plate 52 to move vertically downward slowly along the guide structure of the support frame 51. The drill bit 54 moves down synchronously with the sliding plate 52 to begin drilling the foundation. During the drilling process, the self-locking property of the threaded transmission ensures that the sliding plate 52 will not bounce back upward due to the resistance of the drill bit 54, maintaining a stable feed speed. When the drill bit 54 drills downward, it will pass through the through hole 2 on the support frame 1 and continue to drill deeper into the foundation until the designed reinforcement hole depth is reached (which can be determined by the distance scale of the sliding plate 52 moving downward or by the depth sensor). At this time, the diameter of the reinforcement hole is consistent with the diameter of the drill bit 54, and the hole wall remains relatively intact due to the squeezing of the drill bit 54 (or spiral soil discharge), providing good conditions for the subsequent insertion of reinforcement piles.

[0076] Reference Figure 10 As shown, the traveling mechanism 6 includes horizontal plates 61 that are slidably disposed on both sides of the support frame 1, and guide wheels 62 are disposed on the horizontal plates 61.

[0077] The support frame 1 has a vertical groove on its side wall, and the inner side of the horizontal plate 61 has a slider 312 that matches the groove, forming a structure in which the two horizontal plates 61 clamp the support frame 1; multiple guide wheels 62 (the axis of the guide wheel 62 is parallel to the length direction of the horizontal plate 61) are spaced apart on the lower end face of each horizontal plate 61, which can roll along the foundation surface; the support frame 1 can move up and down vertically between the two horizontal plates 61 by cooperating with the slider 312 of the horizontal plate 61 through the vertical groove of the side wall.

[0078] When the support frame 1 moves upward, the connecting pipe 41 fixed on the support frame 1 moves upward synchronously, causing the upper end of the clamping spring 44 to move upward with the connecting pipe 41. Since the telescopic pipe 42 is not constrained by the ground reaction force and the spring needs to release elastic potential energy, it will pull the limiting ring 43 of the telescopic pipe 42 to move upward (the spring gradually returns from a slightly compressed state to a naturally extended state), thereby causing the telescopic pipe 42 to retract upward as a whole and gradually return to the connecting pipe 41, so that the lower end of the telescopic pipe 42 is away from the ground and avoids contact with the ground or the reserved reinforcement pile.

[0079] Finally, the present invention also provides a modular reinforcement method for existing building foundations, the method of which includes the following steps:

[0080] Step 1: Drilling preparation. Start the motor of the drilling component 5 to drive the drill bit 54 on the sliding plate 52 to rotate. At the same time, rotate the screw 53 on the support frame 51 synchronously. Through the threaded transmission, drive the sliding plate 52 to move slowly vertically downward along the support frame 51. The drill bit 54 moves down with the sliding plate 52, passes through the first row of through holes 2 of the support frame 1, and then drills vertically into the foundation.

[0081] Step 2: Positioning and positioning. The traveling mechanism 6 pushes the support frame 1 to move along a preset direction (such as parallel to the building foundation). The moving distance is strictly controlled to be the spacing between two adjacent rows of through holes 2 (one workstation). During the movement, the guide wheel 62 at the lower end of the horizontal plate 61 rolls along the foundation to reduce movement resistance. After the movement is completed, the support frame 1 remains stable. At this time, the two rows of through holes corresponding to the pile driver 3 are exactly aligned with the first row of reinforcement holes, and the two rows of through holes corresponding to the drilling driver 5 are aligned with the next area to be drilled.

[0082] Step 3: Pile driving preparation. Place the precast reinforced piles one by one into the V-shaped grooves 331 corresponding to the two lead screws 32 of the pile driving component 3. The return spring 342 pushes the lead screws 32 and the slider 312 closer to each other. The roller 33 automatically clamps the reinforced pile through the V-shaped grooves 331. At the same time, the top column 37 at the lower end of the guide plate 36 is attached to the top of the reinforced pile, so that the top column 37 and the reinforced pile are vertically aligned with the V-shaped grooves 331, ensuring that the reinforced pile is perpendicular to the ground.

[0083] Step 4: Reinforce the pile. The two lead screws 32 rotate relative to each other (clockwise on the left, counterclockwise on the right, or vice versa). The lead screws 32 drive the winding wheels 38 on both sides to rotate synchronously, winding the guide rope 39 around the wheel body. The tension of the guide rope 39 overcomes the elastic force of the lifting spring 361, causing the guide plate 36 to slide downward along the guide groove 351.

[0084] Step 5: Secondary positioning. Start the traveling mechanism 6 and push the support frame 1 to move one position again. Align the two rows of through holes corresponding to the grouting component 4 with the first row of reinforced holes that have been driven into the pile. Align the two rows of through holes corresponding to the pile driving component 3 with the second row of reinforced holes that have just been completed by the drilling component 5. Align the two rows of through holes corresponding to the drilling component 5 with the third area to be drilled.

[0085] Step 6: Grouting reinforcement. Cement grout enters the expansion pipe 42 through the connecting pipe 41 and is injected into the reinforcement hole from the lower end of the expansion pipe 42. The grout fills the gap between the reinforcement pile and the hole wall from the bottom of the hole and penetrates into the surrounding foundation pores to improve soil compaction. Grouting is stopped when the grout overflows from the top of the hole or reaches the design grouting pressure.

[0086] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A modular reinforcement device for existing building foundations, comprising a support frame having a plurality of through holes evenly distributed in a matrix on the support frame, characterized in that: The through holes are arranged in several rows with equal spacing between adjacent rows. Each row has several through holes evenly distributed. A traveling mechanism is provided on the support frame. The multiple rows of through holes are arranged sequentially on the side opposite to the traveling direction of the support frame: Drilling components used to drill through holes in corresponding rows and to drill holes in the foundation to form reinforcement holes; A pile driver used to pass through corresponding rows of through holes and drive reinforcing piles into the reinforcement holes of the foundation; Grouting components used to drill through holes in corresponding rows and inject cement grout into the reinforcement holes of the foundation; The pile driver includes a connecting frame set inside the support frame. The connecting frame has symmetrical sliding grooves at both ends. Sliding blocks are symmetrically and slidably set inside the sliding grooves. A lead screw is rotatably set between two corresponding sliders on both sides. Each lead screw is equipped with a roller that corresponds to one-to-one with the through holes in the same row. A V-shaped groove is set on the roller that is located directly above the through hole. Multiple rotating rings are rotatably mounted on the lead screw. A guide rod is provided on one side of each rotating ring. One end of the guide rod slides through the connecting frame. A return spring is provided between the connecting frame and the rotating ring, and the return spring is sleeved on the guide rod. Connecting frames are symmetrically arranged on both sides of the connecting frame. Guide grooves are provided on the connecting frames. A guide plate is slidably arranged between the guide grooves of the two connecting frames. The guide plate is located directly above the through hole. A lifting spring is provided at the lower end of the guide plate and located in the guide groove. The lower end of the guide plate is equipped with top posts that correspond one-to-one with the through holes; Symmetrical winding wheels are arranged on both sides of the lead screw. Guide ropes are wound on the two winding wheels on the same side of the two lead screws, and the guide ropes pass through the guide plate in the middle.

2. The modular reinforcement device for existing building foundations according to claim 1, characterized in that: The grouting component includes a connecting pipe installed on one side of the support frame. The connecting pipe corresponds to a row of through holes. A telescopic pipe is slidably installed inside the connecting pipe. The lower end of the telescopic pipe slides through the corresponding through hole. A limit ring is installed on the telescopic pipe. A retaining spring is installed between the limit ring and the connecting pipe.

3. The modular reinforcement device for existing building foundations according to claim 2, characterized in that: A rubber ring is provided at the lower end of the telescopic tube; a push rod is slidably passed through the connecting tube, and a gear that is threadedly connected to the push rod is rotatably provided on the connecting tube.

4. The modular reinforcement device for existing building foundations according to claim 3, characterized in that: The drilling component includes symmetrically arranged support frames on both sides of the through hole, a sliding plate slidably arranged between the two support frames, a screw rotatably arranged on the support frame, the screw threadedly connected to the sliding plate, and a detachable drill bit arranged on the sliding plate, with the drill bit located directly above the corresponding through hole.

5. The modular reinforcement device for existing building foundations according to claim 4, characterized in that: The traveling mechanism includes horizontal plates that slide on both sides of the support frame, and guide wheels are provided on the horizontal plates.

6. A modular reinforcement method for existing building foundations, employing the modular reinforcement device for existing building foundations as described in claim 5, characterized in that, Its usage includes the following steps: Step 1: Drilling preparation. Start the motor of the drilling unit to drive the drill bit on the sliding plate to rotate. At the same time, rotate the screw on the support frame synchronously. Through the threaded transmission, drive the sliding plate to move slowly vertically downward along the support frame. The drill bit moves down with the sliding plate, passes through the first row of through holes in the support frame, and then drills vertically into the foundation. Step 2: Positioning and positioning. The traveling mechanism pushes the support frame to move along the preset direction. The moving distance is strictly controlled to be the spacing between two adjacent rows of through holes. The through hole row corresponding to the pile driver is aligned with the first row of reinforcement holes, and the through hole row corresponding to the drilling driver is aligned with the next area to be drilled. Step 3: Pile driving preparation. Place the precast reinforced piles one by one into the V-shaped grooves corresponding to the two lead screws of the pile driving component. The return spring pushes the lead screws and sliders closer to each other. The rollers automatically clamp the reinforced piles through the V-shaped grooves. At the same time, the top column at the lower end of the guide plate is in contact with the top of the reinforced pile to ensure that the reinforced pile is perpendicular to the ground. Step 4: Reinforce the pile driving, start the traveling mechanism, and push the support frame to move one position again. Align the through hole row corresponding to the grouting component with the first row of reinforced holes that have been driven into the pile, align the through hole row corresponding to the pile driving component with the second row of reinforced holes that have just been completed by the drilling component, and align the through hole row corresponding to the drilling component with the third area to be drilled.

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