A composite reinforcement device and method for existing building foundations

Abstract

This invention provides a composite reinforcement device and method for existing building foundations, relating to the technical field of existing building reinforcement; it aims to solve the problems of poor technology and low automation in existing building foundation reinforcement. It includes a movable building platform and sequentially arranged extension frames, lifting columns, and a pipe insertion mechanism integrated on the lifting blocks. The pipe insertion mechanism integrates a conveying unit for automatically and continuously transporting micro-steel pipes or drill rods, and a splicing unit for automatically centering and threading the micro-steel pipes. This achieves orderly construction of transporting, pile planting, and grouting for existing building foundations requiring reinforcement, and is particularly suitable for efficient and reliable foundation reinforcement around existing buildings in confined spaces. Through the integrated synergistic reinforcement system design of micro-steel pipe piles, foundation soil grouting, and the addition of a new raft foundation, it breaks through the limitations of traditional single reinforcement technologies and achieves precise adaptation to collapsible fill foundations.

Description

Technical Field

[0001] This invention relates to the technical field of existing building reinforcement, and particularly to a composite reinforcement device and method for existing building foundations. Background Technology

[0002] With the continuous development of urban construction, a large number of existing buildings have developed problems such as uneven settlement and wall cracking due to foundation issues (such as collapsible loess and loose backfill soil), which urgently require foundation reinforcement. Traditional reinforcement methods, such as simply increasing the foundation area, using tree root piles, and jet grouting piles, often have limitations.

[0003] For example, Chinese patent CN215926103U discloses a foundation reinforcement structure for existing buildings, including a foundation and ground. Two piers are set inside the ground, both directly below the foundation. Each pier has a cavity inside. The foundation is buried on top of the ground, and a building is fixedly installed on top of the foundation. Two symmetrically distributed pillars are fixedly installed at the bottom of the foundation. Fixing blocks are fixedly installed on the foundation via the two pillars, and these fixing blocks are slidably installed inside the two piers. Eight telescopic rods are fixedly installed at equal intervals inside each pier. Springs are fitted onto the outer surface of each of the eight telescopic rods, and a clamp is fixedly installed at one end of each of the eight telescopic rods. This series of structural features gives the device strong stability and good fixing effect.

[0004] However, the above-mentioned reinforcement device still has some shortcomings in actual use:

[0005] 1. In the existing technologies mentioned above, the strength and stability of the foundation of existing buildings are improved by adding piers and expansion joints. Although this can provide support for the foundation of existing buildings, it only slows down the trend of settlement. However, it is not suitable for collapsible soils, resulting in a single reinforcement technology. As a result, the current single reinforcement technology is difficult to meet complex needs, and the existing reinforcement technology only treats the symptoms and not the root cause.

[0006] 2. When reinforcing the foundation of an existing building on collapsible soil, it is necessary to treat the collapsible soil first. However, in actual construction, the micro steel pipes required for treating the collapsible soil and the drill rods required for drilling grouting holes all need to be assembled manually. Treating collapsible soil requires hundreds or thousands of grouting holes, which will seriously affect the construction progress.

[0007] 3. Furthermore, when reinforcing the foundation of an existing building, after treating the collapsible soil to make it compacted, the existing foundation needs to be wrapped in the foundation of the new building, and then the bearing capacity is distributed through a raft foundation. However, if the surface treatment of the existing foundation is not done properly when pouring cement to wrap the existing foundation, it will lead to an ineffective bond between the new foundation and the existing foundation, resulting in stress between the new foundation and the existing foundation, which will affect the actual function of the new foundation.

[0008] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing reinforcement devices. Summary of the Invention

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

[0010] In the first aspect, this application provides a composite reinforcement device for the foundation of an existing building, including a movable building platform, a telescopic extension frame on the building platform, a lifting column at the end of the extension frame away from the building platform, an electrically controlled lifting block on the lifting column, and two sets of pipe insertion mechanisms on the lifting block for compacting and reinforcing the soil around the building foundation.

[0011] The tube insertion mechanism includes two sets of control screws that move at the bottom of the lifting block, a control block screwed on the control screws, a conveying unit that continuously conveys the micro steel tubes, and a splicing unit that realizes automatic splicing of the micro steel tubes.

[0012] The splicing unit includes a limiting frame for limiting the position of the micro steel pipes, a positioning column for positioning the two micro steel pipes concentrically, and a splicing wheel for controlling the two micro steel pipes to rotate in opposite directions for splicing.

[0013] The splicing wheel is mounted on the limiting frame, and the positioning column is slidably inserted into the middle of the limiting frame;

[0014] The extension frame is also equipped with a treatment mechanism for cleaning the foundation of existing buildings. The treatment mechanism includes a treatment support on the extension frame and an air jet pipe that is rotatably installed on one side of the treatment support and whose angle can be adjusted.

[0015] Preferably, the conveying unit includes a building platform, an extension frame, and several sprockets rotatably mounted on a control block. A chain for conveying miniature steel pipes or drill rods is mounted on the several sprockets. Several movable blocks are evenly spaced on the side wall of the chain. Each movable block is equipped with a claw for gripping the miniature steel pipe or drill rod. A movable push rod for controlling the movement of the claw is located on the side of the movable block near the movable block.

[0016] Preferably, the limiting frame of the splicing unit is provided with an alignment rod in the middle, one side of the alignment rod abuts against the micro steel pipe and the other side is provided with a linkage block;

[0017] The limit frame is also equipped with two sets of symmetrical wedge rods, one end of which abuts against the linkage block and the other end of which abuts against the positioning column;

[0018] The limit frame is connected to a splicing electric rod, which is located at the bottom of the lifting block. A reset spring is provided between the alignment rod and the limit frame, and a tension spring is provided between the wedge rod and the limit frame.

[0019] Preferably, the control screw is mounted on the control frame, and the control screw is slidably mounted on the bottom of the lifting block via the control frame.

[0020] Preferably, a tensioning rod is provided on the control frame via a torsion spring, and a tensioning wheel that meshes with the chain is provided at the end of the tensioning rod away from the control frame.

[0021] Preferably, the lifting block is also provided with a precision control unit, which includes several precision control plates that are slidably mounted on the control frame. The bottom of the precision control plates has a wave structure of various specifications. Two sets of symmetrical precision control screws are also provided on the control frame, and the precision control plates are screwed onto the precision control screws.

[0022] The bottom of the lifting block is equipped with a precision control column, and a precision control spring is installed between the precision control column and the lifting block. Metal contacts are installed at the bottom of the precision control column and inside the lifting block. When the two sets of metal contacts come into contact, the miniature steel pipe moves with the chain to the designated position to reinforce the soil.

[0023] Preferably, the building platform is also equipped with an air pump, and the air pump has a telescopic air pipe extending outward. The end of the air pipe away from the air pump is connected to the treatment support, and several air nozzles are opened at equal intervals on the side wall of the air jet pipe.

[0024] Preferably, the building platform is also equipped with several rotating brush heads for wiping both ends of the micro steel pipes, and the rotating brush heads move up and down reciprocally;

[0025] The rotating brush head also has a cleaning port that connects to the air pump.

[0026] Preferably, the bottom of the lifting column is equipped with several hydraulic outriggers at different positions.

[0027] Secondly, this application also provides a composite reinforcement method for existing building foundations, as shown below:

[0028] S1. Work positioning: Excavate foundation pits around the existing building foundation to expose the existing building foundation;

[0029] S2. Equipment positioning: Move the building platform to the vicinity of the existing building foundation so that the splicing unit extends into the foundation pit;

[0030] S3. Automated drilling: The conveying unit starts and controls the drill rod to be conveyed into the foundation pit. After the drill rod is in place, the drilling equipment is started to drill holes to form grouting holes and implantation holes in the designated area.

[0031] S4. Automatic pile planting and pouring operation: The conveying unit switches modes to grab and convey the micro steel pipes of the specified length in sequence, cleaning them along the way. Then the splicing unit automatically splices the micro steel pipes with threads. After all the micro steel pipes are in place, the grouting operation is carried out.

[0032] S5. Cleaning operation: Use high-speed airflow to sweep the surface of the existing building foundation and the interface between new and old concrete to remove impurities;

[0033] S6. Pouring operation: Tie the steel mesh and use the rebar anchoring technology to reliably connect the steel skeleton of the raft slab with the existing building foundation. Finally, pour concrete continuously in one go to ensure that the new raft slab is tightly integrated with the original foundation that has been reinforced by composite materials.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] I. This invention breaks through the limitations of traditional single reinforcement technologies by innovatively designing a three-in-one synergistic reinforcement system that integrates micro steel pipe piles, foundation soil grouting, and newly added raft foundation, achieving precise adaptation to collapsible fill foundations.

[0036] Second, this invention achieves automatic gripping, continuous conveying, precise positioning, and intelligent splicing of miniature steel pipes through a conveying unit, splicing unit, and precision control unit. The entire process eliminates the need for frequent manual handling and tightening of the steel pipes, forming a continuous, assembly-line operation mode that significantly reduces construction procedures.

[0037] Third, the splicing unit of this invention achieves rapid assembly between two miniature steel pipes through the active rotation drive of the splicing wheels. This significantly improves the overall efficiency of the pile planting operation, and the sequence of centering before tightening ensures the docking accuracy, eliminating incomplete connections and misalignments.

[0038] Fourth, the processing mechanism of the present invention achieves multiple functions by integrating a high-pressure jet system: during the drilling stage, it can air-cool the drill rod and simultaneously remove residues in the hole; before grouting, it can clean and pre-treat the foundation surface and soil, which not only removes floating dust and impurities that affect the bonding of new and old concrete, but also improves the grouting penetration effect through pre-set cracks, thereby simplifying the construction process while improving the overall quality and reliability of foundation reinforcement. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Figure 1 This is a schematic diagram of the structure between the composite reinforcement device and the existing building foundation in this invention.

[0041] Figure 2 This is a schematic diagram of the composite reinforcement device of the present invention.

[0042] Figure 3 This is a schematic diagram of the cannulation mechanism of the present invention.

[0043] Figure 4 This is a schematic diagram of the conveying unit of the present invention.

[0044] Figure 5 This is a first-view structural diagram of the splicing unit of the present invention.

[0045] Figure 6 This is the present invention. Figure 5 Enlarged view of the local structure at point A in the image.

[0046] Figure 7 This is a schematic diagram of the second-view structure of the splicing unit of the present invention.

[0047] Figure 8 This is a third-view structural diagram of the splicing unit of the present invention.

[0048] Figure 9 This is a schematic diagram of the structure of the precision control unit of the present invention.

[0049] Figure 10 This is a schematic diagram of the processing mechanism of the present invention.

[0050] Figure 11 This is a flowchart of the composite reinforcement method for existing building foundations in this invention.

[0051] Explanation of reference numerals in the attached drawings: 110, miniature steel pipe; 100, existing building foundation; 1, building platform; 10, extension frame; 11, lifting column; 12, lifting block; 2, pipe insertion mechanism; 3, stabilization unit; 20, control screw; 21, control block; 22, conveying unit; 23, splicing unit; 230, limit frame; 231, positioning column; 232, splicing wheel; 4, processing mechanism; 40, processing support; 41, jet pipe; 220, sprocket; 221, chain. 222. Moving block; 223. Claw; 224. Moving push rod; 233. Wedge rod; 234. Alignment rod; 235. Splicing electric rod; 236. Return spring; 237. Linkage block; 238. Tension spring; 25. Control frame; 250. Tensioning rod; 251. Tensioning wheel; 5. Precision control unit; 50. Precision control board; 51. Precision control column; 52. Precision control spring; 53. Metal contact; 54. Precision control screw; 42. Air nozzle; 6. Rotating brush head. Detailed Implementation

[0052] The following combination Figures 1-11 This application will be described in further detail.

[0053] This application discloses a composite reinforcement device and method for existing building foundations, aiming to solve problems such as low automation, low construction efficiency, poor adaptability, weak controllability of reinforcement effect, and insufficient multi-functional integration in the prior art. This invention strives to achieve automatic, continuous, and precise conveying and splicing of the micro steel pipe 110 and drill rod, improving the flexibility and stability of the equipment in confined spaces, and realizing efficient, high-quality, and integrated composite reinforcement of existing building foundations 100.

[0054] Reference Figure 1 and Figure 2 As shown, a composite reinforcement device for the foundation of an existing building includes a building platform 1 that can serve as a mobile base and power source. The building platform 1 is equipped with a telescopic extension frame 10, which greatly expands the horizontal working range of the device. A lifting column 11 is provided at the end of the extension frame 10 away from the building platform 1 to provide vertical adjustment capability. An electrically controlled lifting block 12 is mounted on the lifting column 11, which can move precisely up and down along the lifting column 11.

[0055] The construction platform 1 is usually equipped with tracks or tires to give it good mobility. The platform is equipped with hydraulic system, power system, control system and power source and control unit such as air pump inside or on top. Multiple hydraulic outriggers are installed around the platform to stabilize the entire equipment during construction.

[0056] The drilling equipment is a wave pressure down-the-hole hammer, which is integrated on the lifting block 12. Its impact head can automatically dock with the top of the drill rod delivered to the position by the conveying unit 22. During drilling, the lifting column 11 provides constant axial pressure, and the wave pressure system drives the down-the-hole hammer to work. The drilling depth is monitored in real time by the stroke encoder of the lifting column 11. After reaching the preset depth, the drilling will automatically stop and retract.

[0057] A retractable extension frame 10 extends from the building platform 1 toward the existing building foundation 100 to be reinforced. The extension frame 10 can adopt a multi-stage box-type telescopic arm structure, which is driven by a hydraulic cylinder to extend or retract, thereby adjusting the remote working radius of the device.

[0058] An extension frame 10 is vertically mounted with a lifting column 11. The lifting column 11 is a sleeve-type or guide rail type structure, and its internal lifting block 12 is driven up and down by a hydraulic cylinder or a motor screw mechanism.

[0059] Reference Figure 2 and Figure 3As shown, the lifting block 12 mainly consists of two core parts: one is two sets of insertion mechanisms 2 used to reinforce the soil around the building foundation; the other is a stabilization unit 3 used to support the extension frame 10 and the insertion mechanism 2, ensuring stability during construction. The up-and-down movement of the lifting block 12 can control the up-and-down movement of the insertion mechanism 2 to ensure that the miniature steel pipe 110 is smoothly inserted into the implantation hole.

[0060] The stabilization unit 3 includes a telescopic arm 30 located at the end of the extension frame 10. The telescopic arm 30 extends to resist the reaction force generated during the insertion operation, ensuring the stability of the whole machine.

[0061] The insertion mechanism 2 includes two movable sets of control screws 20 at the bottom of the lifting block 12, a control block 21 screwed onto the control screws 20, a conveying unit 22 for continuously conveying multiple micro steel tubes 110, and a splicing unit 23 for realizing rapid and automatic splicing of micro steel tubes 110.

[0062] First, the conveying unit 22 transports multiple sections of micro steel pipe 110 to the designated position of the lifting block 12. Then, the splicing unit 23 automatically splices the micro steel pipe 110. Therefore, the purpose of implanting the micro steel pipe 110 is to ensure that it can penetrate the underground collapsible soil and come into contact with the underground hard layer to play a supporting role. Subsequently, the cement mortar injected into the micro steel pipe 110, the grouting hole and the implantation hole can solidify and fill the collapsible soil and prevent the collapsible soil from continuing to settle.

[0063] However, the depth of collapsible soil layers varies in different regions. Therefore, the micro-steel pipes 110 are all of standardized length, and their length can be adjusted by threaded connection to cope with different complex geological environments. In addition, the micro-steel pipes 110 are seamless steel pipes.

[0064] When reinforcing and repairing the existing building foundation 100, it is necessary to first conduct a detailed investigation of the type, extent, and soil conditions of the existing building foundation 100, then delineate the area around the existing building foundation 100 where the soil needs to be compacted, and excavate a certain area of ​​soil to expose the existing building foundation 100.

[0065] Then, the building platform 1 is moved to the vicinity of the existing building foundation 100, and the extension frame 10 is deployed so that the stabilization unit 3 is placed on the side wall of the existing building foundation 100, ensuring that the pipe insertion mechanism 2 of the building platform 1 extends into the foundation pit, facilitating subsequent pipe insertion operations. Details are as follows:

[0066] Reference Figure 3 and Figure 4As shown, specifically, the conveying unit 22 includes a building platform 1, an extension frame 10, and several sprockets 220 rotatably mounted on a control block 21. A chain 221 for conveying miniature steel pipes 110 or drill rods is commonly mounted on the several sprockets 220. Several movable blocks 222 are evenly spaced on the side wall of the chain 221. The movable blocks 222 are equipped with claws 223 for gripping miniature steel pipes 110 or drill rods. A movable push rod 224 for controlling the movement of the claws 223 is provided on the side of the claws 223 near the movable blocks 222.

[0067] In practice, the prepared miniature steel pipe 110 is first taken out, and then the motor of the conveying unit 22 is started to make the sprocket 220 rotate at a constant speed. During the rotation of the sprocket 220, the chain 221 and the claw 223 at its upper end are moved. When the claw 223 moves to the end close to the building platform 1, the miniature steel pipe 110 is pressed against the claw 223. Then the movable push rod 224 controls the claw 223 to close, thereby grabbing the miniature steel pipe 110. After being grabbed, the miniature steel pipe 110 moves along the movement trajectory of the chain 221 into the foundation pit dug near the existing building foundation 100.

[0068] The chain 221 is equipped with claws 223 at equal intervals to grip the miniature steel pipes 110, so the chain 221 can continuously transport multiple miniature steel pipes 110 while moving.

[0069] Once the miniature steel tube 110 has moved to the designated position, the claw 223 is released, allowing the miniature steel tube 110 to be inserted into the pre-made implantation hole. At this point, the miniature steel tube 110 is pressed to insert it into the implantation hole, but a portion needs to be exposed. Subsequently, the next adjacent miniature steel tube 110 moves to directly above the miniature steel tube 110 already inserted into the implantation hole. Then, the splicing unit 23 automatically splices them together until a miniature steel tube 110 of the specified length is inserted into the implantation hole. Then, the extension frame 10 and the lifting column 11 cooperate to control the entire splicing unit 23 to move directly above the next implantation hole for subsequent implantation operations.

[0070] This process continues until all implantation holes are filled with miniature steel tubes 110.

[0071] Reference Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the splicing unit 23 includes a limiting frame 230 that abuts against and limits the two micro steel pipes 110 to be spliced, a positioning column 231 that positions and aligns the two micro steel pipes 110, and a splicing wheel 232 that controls the two micro steel pipes 110 to rotate in opposite directions for splicing.

[0072] The splicing wheel 232 is rotatably mounted on the limiting frame 230 via a bearing, and the positioning column 231 is slidably inserted into the middle of the limiting frame 230.

[0073] It should be noted that there are two sets of limit frames 230. Each limit frame 230 has a Y-shaped structure, and the two sets of limit frames 230 are arranged in a U-shape. The alignment rod 234 is slidably disposed at the intersection of the limit frames 230, and the return spring 236 makes it always have the tendency to extend outward.

[0074] The limiting frame 230 of the splicing unit 23 has an alignment rod 234 slidably mounted in the middle. One side of the alignment rod 234 abuts against the miniature steel pipe 110, and the other side has a linkage block 237. Two sets of symmetrical wedge rods 233 are also slidably mounted on the limiting frame 230. One end of the wedge rod 233 abuts against the linkage block 237, and the other end abuts against the positioning post 231. A splicing electric rod 235 is connected to the limiting frame 230. The splicing electric rod 235 is located at the bottom of the lifting block 12. A reset spring 236 is provided between the alignment rod 234 and the limiting frame 230, and a tension spring 238 is provided between the wedge rod 233 and the limiting frame 230.

[0075] In practice, the splicing electric rod 235 is activated, controlling the limit frame 230 to move towards the two miniature steel pipes 110 on the same vertical line until the two alignment rods 234 simultaneously contact the two miniature steel pipes 110 at their ends. At this point, the two alignment rods 234 move backward due to external pressure, pressing against the wedge rod 233. The wedge rod 233, under external pressure, moves passively and applies external force to one end of the positioning post 231. The positioning post 231, under this external force, rotates around the hinge point, bringing its other end closer to the miniature steel pipe 110 and limiting its movement. This ensures that the ends of the two miniature steel pipes 110 are aligned, preventing them from collapsing. After shaking, the splicing wheel 232, which is pressed against the micro steel pipe 110, is energized and begins to rotate rapidly, simultaneously driving the micro steel pipe 110 that is not inserted into the soil to rotate. During the rotation, the threaded structure at the tail of the micro steel pipe 110 that is not inserted into the soil will rotate into the micro steel pipe 110 that has been inserted into the soil, until the two micro steel pipes 110 are perfectly spliced. Then, the spliced ​​micro steel pipe 110 is inserted into the implantation hole to a certain depth, and the above steps are repeated to splice the micro steel pipe 110 multiple times until the micro steel pipe 110 is spliced ​​to the specified length. Then, the entire spliced ​​micro steel pipe 110 can be completely inserted into the implantation hole, and cement mortar can be injected later.

[0076] There are two splicing wheels 232, which are respectively located on both sides of the limit frame 230 and are driven by independent servo motors. When the two micro steel pipes 110 are aligned end to end, the control system controls the two splicing wheels 232 to rotate at the same speed but in opposite directions, respectively clamping and driving the upper and lower micro steel pipes 110 to rotate in opposite directions, so as to realize automatic spiraling.

[0077] Let's look again. Figure 4 and Figure 5 As shown, the tube insertion mechanism 2 includes two movable sets of control screws 20 at the bottom of the lifting block 12, a control block 21 screwed onto the control screws 20, a conveying unit 22 for continuously conveying multiple micro steel tubes 110, and a splicing unit 23 for realizing rapid and automatic splicing of micro steel tubes 110.

[0078] Let's look again. Figure 5 and Figure 9 As shown, the control screw 20 is mounted on the control frame 25, and the control screw 20 is slidably mounted on the bottom of the lifting block 12 via the control frame 25.

[0079] In practice, once the micro steel pipe 110 is installed in one implantation hole, the other implantation holes need to be installed one after another. Therefore, the control screw 20 can control the lifting block 12 to adjust its position. When the lifting block 12 moves horizontally along the control screw 20, the splicing unit 23 moves synchronously. At the same time, the end of the chain 221 away from the building platform 1 moves with the lifting block 12, so that it can implant the micro steel pipe 110 into the implantation holes at different positions.

[0080] Considering the potential slack in chain 221 during long-distance transmission, a tensioning rod 250 is elastically hinged to the control frame 25 via a torsion spring. A tensioning wheel 251, meshing with the chain 221, is mounted on the free end of the tensioning rod 250. The torsion spring consistently provides the tensioning rod 250 with a tendency to press the tensioning wheel 251 against the chain 221, thereby automatically compensating for the elongation of the chain 221 caused by wear or temperature changes, ensuring smooth and reliable transmission.

[0081] To achieve precise control of the implantation spacing of the miniature steel tubes 110, a precision control unit 5 is added to the lifting block 12. This unit includes several precision control plates 50 of different sizes that are slidably mounted on the control frame 25. The bottom edges of these precision control plates 50 are machined into wave-shaped structures with different wavelengths and amplitudes. Two sets of symmetrical precision control screws 54 are also provided on the control frame 25, and the precision control plates 50 are screwed onto these two precision control screws 54. By synchronously rotating the precision control screws 54, the contact between the precision control plates 50 of different sizes and the precision control column 51 can be adjusted simultaneously.

[0082] Reference Figure 9As shown, the lifting block 12 is also equipped with a precision control unit 5. The precision control unit 5 includes several precision control plates 50 of different sizes that are slidably mounted on the control frame 25. The bottom of the precision control plates 50 is a wave structure of different sizes. Two sets of symmetrical precision control screws 54 are also provided on the control frame 25. The precision control plates 50 are screwed onto the precision control screws 54.

[0083] The bottom of the lifting block 12 is provided with a precision control column 51, and a precision control spring 52 is provided between the precision control column 51 and the lifting block 12. Metal contacts 53 are provided at the bottom of the precision control column 51 and inside the lifting block 12. When the two sets of metal contacts 53 come into contact, the miniature steel pipe 110 moves with the chain 221 to the designated position to reinforce the soil.

[0084] In specific implementation, when the control screw 20 drives the lifting block 12 to move horizontally, the horizontal movement of the lifting block 12 can be achieved. However, the distance of its movement cannot be precisely controlled. Therefore, this application proposes a precision control unit 5. When the lifting block 12 moves, the precision control column 51 at its top moves synchronously, and the top of the precision control column 51 always abuts against the wave structure of the precision control plate 50. The distance between each lowest point of the wave structure of the precision control plate 50 is the distance of the implantation hole. In this way, when the lifting block 12 moves, the metal contact 53 at the bottom of the precision control column 51 will contact the metal contact 53 inside the lifting block 12. When the two contact, an electrical signal will be emitted, thereby stopping the control screw 20 from working. At this time, the position of the lifting block 12 is the position of the subsequent implantation hole.

[0085] Furthermore, depending on the soil environment of the existing building foundation 100, the density of the implanted micro steel pipes 110 will also be different. Therefore, this application also proposes precision control plates 50 of different sizes. Since the spacing between the crests of the wave structure of the precision control plates 50 of different sizes is also different, several commonly used sizes of precision control plates 50 are designed.

[0086] Rotating the precision control screw 54 can drive the multiple precision control plates 50 that are abutting each other to adjust their positions, so that the required precision control plate 50 can contact the precision control column 51.

[0087] To further improve the efficiency of splicing the micro-steel pipes 110, ensure the cleanliness of the micro-steel pipes 110 or drill rods during connection, and enhance connection reliability, a cleaning module is also integrated on the construction platform 1. This module typically includes a pair of rotating brush heads 6 with soft bristles or cloth wheels, located at the entrance of the conveyor chain 221 or at key turning points. These brush heads automatically wipe both ends of the micro-steel pipes 110 or drill rods during the gripping and conveying process by the claws 223, removing adhering construction dust and dirt.

[0088] When the miniature steel tube 110 is gripped and transported by the claw 223, it needs to pass through the area where the rotating brush head 6 is located. Then the rotating brush head 6 rotates to clean the threaded grooves at both ends of the miniature steel tube 110, so as to avoid dust accumulation on its surface from affecting subsequent screwing.

[0089] The rotating brush head 6 can not only rotate, but also move up and down. The rotation of the rotating brush head 6 can wipe the threaded groove at one end of the micro steel tube 110, while the up and down movement can make it penetrate into the threaded hole of the micro steel tube 110 and wipe the threaded hole, thus cleaning large particles of impurities.

[0090] Reference Figure 10 As shown, in addition to tube reinforcement, this application also integrates a treatment mechanism 4 for pre-treatment or co-treatment of the existing building foundation 100. The extension frame 10 is also equipped with a treatment mechanism 4 for treating the existing building foundation 100. The treatment mechanism 4 includes a treatment support 40 on the extension frame 10 and an air jet pipe 41 that is rotatably installed on one side of the treatment support 40 and has an adjustable angle.

[0091] The building platform 1 is also equipped with an air pump, which has a telescopic air pipe extending outward. The end of the air pipe away from the air pump is connected to the treatment support 40. Several air nozzles 42 are opened at equal intervals on the side wall of the air jet pipe 41.

[0092] The building platform 1 is equipped with an air pump, which is connected to the treatment support 40 via a retractable air pipe, ultimately supplying high-pressure gas to the jet pipe 41. Multiple jet nozzles 42 are evenly spaced along the length of the side wall of the jet pipe 41. This mechanism can be used to blow away dust and debris from the foundation surface, or to inject low-pressure air into the soil before grouting to expand cracks, facilitating subsequent filling and improving the grouting effect.

[0093] Reference Figure 11 As shown, a composite reinforcement method for existing building foundations (100mm thick) is as follows:

[0094] S1. Work Positioning: Conduct a detailed investigation of the types, extent, and soil conditions of the existing building foundation 100, then delineate the area around the existing building foundation 100 where the soil needs to be compacted, and excavate a certain area of ​​soil to expose the existing building foundation 100.

[0095] S2. Equipment positioning: Move the building platform 1 to the vicinity of the existing building foundation 100, and then unfold the extension frame 10 so that the stabilization unit 3 is placed on the side wall of the existing building foundation 100 to ensure the stability of the splicing unit 23 extending into the foundation pit.

[0096] S3. Automated Drilling: The conveying unit 22 of the insertion mechanism 2 is activated, and the chain 221 drives the claw 223 to grab the drill rod and continuously and accurately transport it to the predetermined implantation hole position in the foundation pit. After the drill rod is in place, the drilling equipment connected to it (such as a down-the-hole hammer or rotary drill) is activated to carry out drilling operations within the designated area. This process simultaneously forms two types of holes: grouting holes for subsequent grouting and implantation holes for inserting the micro steel pipe 110. At the same time, in the processing mechanism 4, the air pump is turned on, and high-pressure airflow is continuously ejected through the air outlet 42 on the side of the air jet pipe 41 to cool the working drill rod and simultaneously blow away the drill cuttings in the hole to ensure the quality of the hole formation.

[0097] S4. Automatic Pile Planting and Pouring Operation: The conveying unit 22 switches modes to sequentially grab and convey the standard-length micro-steel pipes 110. During the conveying path, the rotating brush head 6 of the cleaning module automatically cleans the threaded joints and grooves at both ends of the micro-steel pipes 110, ensuring the cleanliness of the connection surfaces and guaranteeing splicing quality. When the first micro-steel pipe 110 conveyed by the chain 221 is positioned directly above the target implantation hole, the claw 223 releases the micro-steel pipe 110, allowing it to be initially inserted into the implantation hole under gravity or slight pressure, leaving a certain exposed portion for splicing.

[0098] Next, the splicing electric rod 235 pushes the limiting frame 230 to limit the alignment rod 234 and the positioning column 231 to the miniature steel pipe 110. Then, the splicing wheel 232 rotates at high speed, driving the upper miniature steel pipe 110 to be screwed into the lower fixed steel pipe, completing the automated threaded splicing.

[0099] Repeat this splicing process until all implantation holes have been implanted with miniature steel tubes 110.

[0100] Finally, cement mortar is pumped into both the grouting hole and the micro steel pipe 110 using grouting equipment. The grout fully penetrates and solidifies the surrounding collapsible soil, forming a composite solidified body.

[0101] S5. Cleaning Operation: After the pile grouting is completed and the quality is qualified, the treatment mechanism 4 is activated again. Adjust the angle of the jet pipe 41 and use the high-speed airflow generated to thoroughly blow away the surface of the existing building foundation 100 and the interface between the new and old concrete, removing all floating dust, loose particles and impurities, creating a clean and highly adhesive interface for subsequent integral pouring.

[0102] S6. Pouring Operation: On the treated clean foundation, steel mesh is tied to construct a reinforced concrete raft slab that meets design requirements. Using rebar anchoring technology, the steel reinforcement cage of the raft slab is reliably connected to the existing building foundation. Finally, concrete is poured continuously in one go to ensure a tight bond between the new raft slab and the reinforced original foundation, forming a new building foundation.

[0103] 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 composite reinforcement device for existing building foundations, characterized in that: The platform includes a building platform (1), on which an extension frame (10) is provided. A lifting column (11) is provided at the end of the extension frame (10) away from the building platform (1). A lifting block (12) is provided on the lifting column (11). The lifting block (12) is also provided with: Two sets of pipe-insertion mechanisms for reinforcing the compacted soil around the building foundation (2); The insertion mechanism (2) includes two sets of control screws (20) that move at the bottom of the lifting block (12), a control block (21) screwed on the control screws (20), a conveying unit (22) for conveying the micro steel pipe, and a splicing unit (23) for automatically splicing the micro steel pipe. The splicing unit (23) includes a limiting frame (230) for limiting the micro steel pipe, a positioning column (231) for positioning the micro steel pipe, and a splicing wheel (232) for controlling the splicing of the micro steel pipe. The splicing wheel (232) is rotatably mounted on the limiting frame (230), and the positioning column (231) is slidably inserted into the middle of the limiting frame (230); the limiting frame (230) is connected to the splicing electric rod (235), which is located at the bottom of the control block (21); The extension frame (10) is also provided with a processing mechanism (4), which includes a processing bracket (40) provided on the extension frame (10) and an adjustable jet pipe (41) on one side of the processing bracket (40). The control screw (20) is mounted on the control frame (25), and the control block (21) is slidably mounted on the bottom of the lifting block (12) via the control screw (20); The conveying unit (22) includes a lifting block (12), a control frame (25), and several sprockets (220) rotatably mounted on the control block (21). A chain (221) for conveying miniature steel pipes is mounted on the several sprockets (220). Several movable blocks (222) are provided at equal intervals on the side wall of the chain (221). The movable blocks (222) are provided with claws (223) for gripping miniature steel pipes. The claws (223) are provided with movable push rods (224) for controlling their movement on the side of the movable blocks (222) near the movable blocks (222).

2. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: The middle of the limiting frame (230) of the splicing unit (23) is provided with an alignment rod (234), one side of the alignment rod (234) abuts against the micro steel pipe and the other side is provided with a linkage block (237). Two sets of symmetrical wedge rods (233) are also slidably provided on the limit frame (230). One end of the wedge rod (233) abuts against the linkage block (237), and the other end abuts against the positioning post (231). A return spring (236) is provided between the alignment rod (234) and the limit frame (230), and a tension spring (238) is provided between the wedge rod (233) and the limit frame (230).

3. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: A tensioning rod (250) is provided on the control frame (25) via a torsion spring. A tensioning wheel (251) that meshes with a chain (221) is provided at the end of the tensioning rod (250) away from the control frame (25).

4. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: The control block (21) is also provided with a precision control unit (5), which includes several precision control plates (50) that are slidably mounted on the control frame (25). The bottom of the several precision control plates (50) is a wave structure of multiple specifications. Two sets of symmetrical precision control screws (54) are also provided on the control frame (25). The several precision control plates (50) are screwed onto the precision control screws (54). The top of the control block (21) is provided with a precision control column (51), and a precision control spring (52) is provided between the precision control column (51) and the control block (21). Metal contacts (53) are provided at the bottom of the precision control column (51) and inside the control block (21). When the two sets of metal contacts (53) come into contact, the miniature steel pipe moves with the chain (221) to the designated position and then performs soil reinforcement.

5. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: An air pump is also provided on the building platform (1). The air pump has a telescopic air pipe extending outward. The end of the air pipe away from the air pump is connected to the treatment bracket (40). Several air nozzles (42) are opened at equal intervals on the side wall of the air jet pipe (41).

6. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: The building platform (1) is also equipped with several rotating brush heads (6) for wiping the two ends of the micro steel pipes. The rotating brush heads (6) move up and down repeatedly. The rotating brush head (6) also has a cleaning port that is connected to the air pump.

7. The composite reinforcement device for existing building foundations according to claim 1, characterized in that: The bottom of the lifting column (11) is equipped with several hydraulic outriggers at different positions.

8. A method for composite reinforcement of existing building foundations, employing the composite reinforcement device for existing building foundations as described in any one of claims 1-7, characterized in that: The reinforcement methods are as follows: S1. Work positioning: Excavate foundation pits around the existing building foundation to expose the existing building foundation; S2, Equipment positioning: Move the building platform (1) to the vicinity of the existing building foundation so that the splicing unit (23) extends into the foundation pit; S3, Automated drilling: The conveying unit (22) is started, and the drill rod is conveyed to the foundation pit. The drilling equipment is started to drill holes to form grouting holes and implantation holes. S4. Automatic pile planting and pouring operation: The conveying unit (22) switches modes, grabs and conveys the standard length micro steel pipe, cleans it along the way, and then the splicing unit (23) automatically splices it. After all the micro steel pipes are in place, the grouting operation is carried out. S5. Cleaning operation: Use high-speed airflow to sweep the surface of the existing building foundation and the interface between new and old concrete to remove impurities; S6. Pouring operation: Tie the steel mesh and use the rebar anchoring technology to reliably connect the steel skeleton of the raft slab with the existing building foundation. Finally, pour concrete continuously in one go to ensure that the new raft slab is tightly integrated with the original foundation that has been reinforced by composite materials.

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