Highway subgrade non-silt excavation and transportation precast soil pile reinforcing construction method

Abstract

This invention belongs to the field of highway engineering technology, specifically a method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation. The method includes the following steps: Step 1: First, conduct soft soil foundation surveying. Using specialized surveying equipment, the depth, distribution range, and soil conditions of the shallow soft soil foundation are thoroughly investigated through ground-penetrating radar and drilling sampling. After collecting sufficient data, the specific areas requiring reinforcement are delineated based on the geological report. This method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation effectively improves the bearing capacity of shallow soft soil foundations, reduces environmental pollution during soft soil foundation treatment, and accelerates construction progress. It avoids the large-scale excavation and transportation of silt in traditional soft soil foundation treatment, significantly reducing labor intensity and project costs. It also reduces environmental pollution during construction and lowers energy consumption due to the shorter construction period.

Description

Technical Field

[0001] This invention relates to the field of highway engineering technology, and in particular to a method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation. Background Technology

[0002] The treatment of shallow soft soil foundations has always been a technical challenge in current highway construction. Due to their low bearing capacity and tendency to settle, these foundations severely impact the stability and service life of the roadbed. Traditional soft soil foundation treatment methods, such as silt excavation and replacement, not only require significant manpower and material resources but also have long construction cycles and substantial environmental impacts. During silt excavation, large quantities of silt need to be disposed of at suitable locations to avoid secondary pollution. Simultaneously, replacement requires large quantities of sand and gravel, increasing material costs and potentially affecting construction progress due to material sourcing issues. Furthermore, soil erosion, a common problem during soft soil foundation construction, leads to uneven settlement of the roadbed, affecting its smoothness and increasing the difficulty and cost of later maintenance. Therefore, existing soft soil foundation treatment technologies suffer from numerous problems, including low construction efficiency, significant environmental impact, high costs, and difficult maintenance. To address these issues, a precast soil pile reinforcement method for highway roadbeds without silt excavation and transportation is needed. Summary of the Invention

[0003] Based on existing technical problems, this invention proposes a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation.

[0004] The present invention proposes a method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation, which includes the following steps: Step 1: First, conduct soft soil foundation survey; bring professional survey equipment to the site, and use ground-penetrating radar and drilling sampling methods to detect in detail the depth, distribution range and soil conditions of shallow soft soil foundation; after collecting sufficient data, combine with the geological report to delineate the specific areas that need to be reinforced.

[0005] Step Two: Next, design the precast soil piles. Based on the survey data, considering soil characteristics and soft soil depth, determine the size, quantity, and type of the precast soil piles. For different soil types, select different cement-soil piles, lime-soil piles, or solidifier-soil piles. Design parameters include: pile diameter 0.5-1 meter, pile spacing 1.5-2 meters, and pile length determined according to the soft soil depth to ensure the pile bottom is located in a stable soil layer. A detection and installation groove is also opened in the middle of the precast soil pile, and a real-time detection mechanism is installed inside the detection and installation groove to realize real-time monitoring of the verticality during the installation of the precast soil pile.

[0006] Step 3: Then, the piles are located and laid out. In the reinforcement area, the piles are accurately located using a total station and GPS measuring equipment, and the specific location of each precast soil pile is marked. According to the pile layout drawings, the precast soil piles are transported to the construction site and placed according to the marked positions.

[0007] Step 4: In the pile insertion stage, the vibratory pile driver is used to insert the precast soil piles one by one into the soft soil foundation until the predetermined depth is reached. During the insertion process, the vibration and mechanical compaction of the vibratory pile driver make the soil piles tightly bonded to the surrounding soft soil. After the piles are inserted, they are filled and compacted. The gaps between the piles are filled with pre-prepared mixed improved soil, and then a compactor is used to compact it to ensure that the filling soil is tightly bonded to the precast soil piles.

[0008] Step 5: Finally, carry out follow-up treatment; after construction is completed, a professional testing agency will conduct static or dynamic load tests on the foundation to verify whether the reinforcement effect meets the design requirements; based on the test results, the roadbed will be adjusted and optimized as necessary; after confirming that there are no problems, further construction of the roadbed will be carried out.

[0009] Preferably, the real-time detection mechanism includes a mounting base plate, which is installed on the inner bottom wall of the top of the detection mounting groove. Support columns are installed in a circular array on the top of the mounting base plate, and a triangular top plate is fixedly installed on the top of each of the three support columns. A transition hole is opened at the center of the top of the triangular top plate.

[0010] Preferably, a support ring is fixedly installed at the bottom center of the triangular top plate. The inner wall of the support ring and the inner wall of the transition hole are both spherical. A counterweight ball is rotatably connected to the spherical inner wall of the support ring and the spherical inner wall of the transition hole. A laser emitter is fixedly installed at the center bottom of the counterweight ball.

[0011] Preferably, a limiting ring is fixedly installed on the top plate of the triangular top plate, the inner wall of the limiting ring is adapted to the spherical surface of the counterweight ball, and the diameter of the counterweight ball is located inside the transition hole.

[0012] Preferably, a base and a U-shaped seat are fixedly installed on the top of the mounting base plate, the two U-shaped seats are symmetrically arranged, and a roller is rotatably connected to the inner walls of both sides of the U-shaped seat through bearings. A drum is fixedly installed on the arc surface of the roller, and a steel cable is wound around the arc surface of the drum. The two steel cables are symmetrically arranged. One end of the roller passes through and extends to one end of the U-shaped seat, and a driven sprocket is fixedly installed thereon.

[0013] Preferably, a drive motor is fixedly installed on the top of the base, and a drive shaft is fixedly installed on the output end of the drive motor through a coupling. A drive sprocket is fixedly installed on one end of the drive shaft. The tooth grooves of the two driven sprockets are connected to the tooth grooves of the drive sprockets by a chain. One driven sprocket is located inside the chain, and the other driven sprocket is located outside the chain. The rotation directions of the two driven sprockets are symmetrically arranged through chain transmission.

[0014] Preferably, a detection disk is fixedly installed at the bottom end of each of the two steel cables, and a laser receiver is fixedly installed at the top of the detection disk, so that the laser emitted by the laser emitter is received by the laser receiver.

[0015] Preferably, a limiting sleeve is fixedly installed at the bottom center of the detection disk, and a rotating shaft is rotatably connected to the inner wall of the limiting sleeve through a bearing. A driven gear is fixedly installed on the top arc surface of the rotating shaft. A rotary motor and an L-shaped limiting plate are also fixedly installed on one side of the bottom of the detection disk. A gear shaft is fixedly installed at the output end of the rotary motor through a coupling. A driving gear is fixedly installed at the bottom end of the gear shaft, and the teeth of the driving gear mesh with the tooth grooves of the driven gear.

[0016] Preferably, a fixed connecting ring is fixedly installed at the bottom end of the L-shaped limiting plate. The inner wall of the fixed connecting ring is rotatably connected to the bottom arc surface of the rotating shaft through a bearing. Each arc surface of the fixed connecting ring is hinged with a first connecting rod through a pin. Multiple first connecting rods are distributed in a ring array with the axis of the rotating shaft as the center.

[0017] Preferably, the circular arc surface of the rotating shaft is threaded with a movable ring, and the circular arc surface of the movable ring is hinged with a second connecting rod by a pin. One end of the first connecting rod and one end of the second connecting rod are hinged with a clamping arc plate by a pin, and the surfaces of the plurality of clamping arc plates are in contact with the bottom circular arc inner wall of the detection mounting groove.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention can effectively improve the bearing capacity of shallow soft soil foundations, reduce environmental pollution problems in soft soil foundation treatment, and accelerate the construction progress; it avoids the large amount of silt excavation and transportation in traditional soft soil foundation treatment, greatly reducing the labor intensity and engineering cost of construction; it reduces environmental pollution during construction, and reduces energy consumption due to the shorter construction cycle; it adopts precast soil pile technology, which has a high degree of mechanization and simple procedures, effectively shortening the construction time and reducing the uncertainty of human operation; through the close bonding between the pile body and the soil, it significantly improves the bearing capacity of shallow soft soil foundations and ensures the long-term stability of the roadbed.

[0020] 2. This device can be quickly clamped into the detection and installation slot before the precast soil pile installation operation, and can be quickly disassembled after the installation operation is completed to facilitate the insertion of the next precast soil pile, greatly improving the flexibility and efficiency of the construction process. Due to the reusability of this device, it reduces the dependence on dedicated detection equipment, lowers construction costs, and improves the overall practicality of the equipment. Compared with the traditional method of setting sensors on the outer arc surface of the precast soil pile, the internal installation method of this device avoids the problem of being unable to remove them in soft soil foundations, reducing cost waste. Since the sensors are set inside, this design reduces the risk of damage caused by external collisions or wear during construction, thereby ensuring the stability and reliability of the monitoring equipment. By avoiding the damage and non-removability of external sensors during construction, this device reduces the cost of replacing and repairing sensors, lowering the overall construction cost. By reducing construction delays caused by sensor damage, this real-time detection device helps maintain the construction progress and ensures that the project is completed on time. Through real-time monitoring and correction, this device helps ensure the verticality of the precast soil piles, thereby improving construction quality and reducing rework and repairs caused by verticality issues later. Attached Figure Description

[0021] Figure 1 A schematic diagram of a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0022] Figure 2 A three-dimensional diagram of a precast soil pile structure for a method of reinforcing highway subgrade without silt excavation and transportation.

[0023] Figure 3 A three-dimensional diagram of the testing and installation trench structure for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0024] Figure 4 A three-dimensional sectional view of the testing and installation trench structure for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0025] Figure 5 A three-dimensional diagram of a real-time monitoring mechanism for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0026] Figure 6 A three-dimensional diagram of the installation base plate structure for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0027] Figure 7 A three-dimensional view of an L-shaped limiting plate structure for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0028] Figure 8A three-dimensional diagram of a triangular top plate structure for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0029] Figure 9 A three-dimensional diagram of a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation;

[0030] Figure 10 An exploded three-dimensional view of a real-time monitoring mechanism for a precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation.

[0031] In the diagram: 1. Precast soil pile; 2. Inspection and installation groove; 3. Real-time inspection mechanism; 4. Installation base plate; 5. Support column; 6. Triangular top plate; 7. Adapter hole; 8. Support ring; 9. Counterweight ball; 10. Laser emitter; 11. Limiting ring; 12. Base; 13. U-shaped seat; 14. Reel; 15. Drum; 16. Steel cable; 17. Driven sprocket; 18. Drive motor; 19. Drive shaft; 20. Drive sprocket; 21. Chain; 22. Inspection disc; 23. Laser receiver; 24. Limiting sleeve; 25. Rotating shaft; 26. Driven gear; 27. Rotary motor; 28. L-shaped limiting plate; 29. ​​Gear shaft; 30. Drive gear; 31. Fixed connecting ring; 32. First connecting rod; 33. Moving ring; 34. Second connecting rod; 35. Clamping arc plate. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Reference Figures 1-10 A method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation includes the following steps: Step 1: First, conduct soft soil foundation survey; bring professional survey equipment to the site, and use ground-penetrating radar and drilling sampling methods to detect in detail the depth, distribution range and soil conditions of shallow soft soil foundation; after collecting sufficient data, combine with the geological report to delineate the specific areas that need to be reinforced.

[0034] Step 2: Next, design the precast soil pile 1. Based on the survey data, considering soil characteristics and soft soil depth, determine the size, quantity, and type of the precast soil pile 1. For different soil types, select different cement-soil piles, lime-soil piles, or solidifier-soil piles. Design parameters include: pile diameter 0.5-1 meter, pile spacing 1.5-2 meters, and pile length determined according to the soft soil depth to ensure that the pile bottom is located in a stable soil layer. A detection and installation groove 2 is also opened in the middle of the precast soil pile 1. A real-time detection mechanism 3 is installed inside the detection and installation groove 2. The real-time detection mechanism 3 realizes the real-time monitoring of the verticality of the precast soil pile 1 during installation.

[0035] The real-time detection mechanism 3 includes a mounting base plate 4, which is installed on the inner bottom wall of the top of the detection mounting groove 2. Support columns 5 are installed in a ring array on the top of the mounting base plate 4. Triangular top plates 6 are fixedly installed on the top of each of the three support columns 5. A transition hole 7 is opened at the center of the top of the triangular top plate 6.

[0036] Specifically, the support columns 5 are arranged in a ring array on the mounting base plate 4, and a triangular top plate 6 is fixed on top. This structural design increases the mechanical strength and stability of the entire detection mechanism. Due to its geometric characteristics, the triangular top plate 6 can effectively disperse and bear forces from all directions, thereby improving the overall structural stability.

[0037] A support ring 8 is fixedly installed at the bottom center of the triangular top plate 6. The inner wall of the support ring 8 and the inner wall of the transition hole 7 are both spherical. A counterweight ball 9 is rotatably connected to the spherical inner wall of the support ring 8 and the spherical inner wall of the transition hole 7. A laser emitter 10 is fixedly installed at the center bottom of the counterweight ball 9.

[0038] Specifically, the design of the spherical inner wall allows the counterweight ball 9 to rotate freely within the support ring 8 and the transition hole 7, which helps to precisely adjust the direction of the laser emitter 10 and ensure that the laser beam can be accurately aligned with the detection target; when the precast soil pile 1 is installed vertically downwards, the laser precisely aligns; since the counterweight ball 9 can rotate, the offset can be detected after the verticality of the precast soil pile 1 is offset during operation.

[0039] A limiting ring 11 is fixedly installed on the top plate of the triangular top plate 6. The inner wall of the limiting ring 11 is adapted to the spherical surface of the counterweight ball 9. The diameter of the counterweight ball 9 is located inside the transition hole 7.

[0040] Specifically, the design of the limiting ring 11 can prevent the counterweight ball 9 from accidentally falling off during operation, ensuring the safe operation of the detection mechanism. Since the limiting ring 11 restricts the position of the counterweight ball 9, it is easier to position and fix the counterweight ball 9 when maintaining or replacing the laser emitter 10, simplifying the maintenance process.

[0041] The top of the mounting base plate 4 is also fixedly mounted with a base 12 and a U-shaped seat 13. The two U-shaped seats 13 are symmetrically arranged. The inner walls on both sides of the U-shaped seat 13 are rotatably connected to a roller 14 through bearings. A drum 15 is fixedly mounted on the arc surface of the roller 14. A steel cable 16 is wound around the arc surface of the drum 15. The two steel cables 16 are symmetrically arranged. One end of the roller 14 passes through and extends to one end of the U-shaped seat 13, and a driven sprocket 17 is fixedly mounted thereon.

[0042] Specifically, the steel cable 16 wound on the drum 15 can be adjusted in length by rotating the shaft 14, thereby adjusting the position of the detection equipment and increasing the flexibility of the system; the symmetrical arrangement of the steel cable 16 can ensure that the force is evenly distributed during operation, reducing the risk of single-point overload; the installation of the driven sprocket 17 allows the shaft 14 to be connected to the power source through the chain 21 or other transmission devices, realizing efficient energy transfer and control of the shaft 14.

[0043] A drive motor 18 is fixedly installed on the top of the base 12. The output end of the drive motor 18 is fixedly installed with a drive shaft 19 via a coupling. A drive sprocket 20 is fixedly installed on one end of the drive shaft 19. The tooth grooves of the two driven sprockets 17 are connected to the tooth grooves of the drive sprocket 20 by a chain 21. One driven sprocket 17 is located inside the chain 21, and the other driven sprocket 17 is located outside the chain 21. The rotation directions of the two driven sprockets 17 are symmetrically arranged through the transmission of the chain 21.

[0044] Specifically, this is achieved by using chain 21 to drive the two driven sprockets 17 to rotate synchronously, ensuring the synchronous operation of the reel 14, which is crucial for inspection tasks that require symmetrical operation. The symmetrical rotation direction of the driven sprockets 17 ensures that the winding and unwinding of the steel cable 16 is uniform and synchronous, thereby maintaining the balance of the inspection mechanism.

[0045] A detection plate 22 is fixedly installed at the bottom of each of the two steel cables 16, and a laser receiver 23 is fixedly installed at the top of the detection plate 22. The laser emitted by the laser emitter 10 is received by the laser receiver 23.

[0046] Specifically, by adjusting the length and tension of the steel cable 16, the laser emitter 10 and receiver can be easily aligned, making the detection process more convenient; the laser receiver 23 receives the light source emitted by the top laser emitter 10 to achieve the effect of verticality monitoring and quickly feeds back to the control system.

[0047] A limiting sleeve 24 is fixedly installed at the bottom center of the detection disk 22. A rotating shaft 25 is rotatably connected to the inner wall of the limiting sleeve 24 via a bearing. A driven gear 26 is fixedly installed on the top arc surface of the rotating shaft 25. A rotary motor 27 and an L-shaped limiting plate 28 are also fixedly installed on one side of the bottom of the detection disk 22. A gear shaft 29 is fixedly installed at the output end of the rotary motor 27 via a coupling. A driving gear 30 is fixedly installed at the bottom end of the gear shaft 29. The teeth of the driving gear 30 mesh with the tooth grooves of the driven gear 26.

[0048] Specifically, this is achieved by using gear meshing, whereby the rotary motor 27 can precisely control the rotation of the driven gear 26 and the rotary shaft 25, thereby enabling the precise installation and positioning of the detection disc 22.

[0049] A fixed connecting ring 31 is fixedly installed at the bottom end of the L-shaped limiting plate 28. The inner wall of the fixed connecting ring 31 is rotatably connected to the bottom arc surface of the rotating shaft 25 through a bearing. The arc surface of the fixed connecting ring 31 is hinged with a first connecting rod 32 through a pin. Multiple first connecting rods 32 are arranged in a ring array with the axis of the rotating shaft 25 as the center.

[0050] Specifically, under the limiting connection of the L-shaped limiting plate 28, the control detection plate 22 is installed in parallel with the bottom fixed connecting ring 31. Then, under the rotation of the rotating shaft 25, the first connecting rod 32 on the control surface opens to achieve the clamping and positioning effect of the detection plate 22.

[0051] The circular arc surface of the rotating shaft 25 is threaded with a moving ring 33. The circular arc surface of the moving ring 33 is hinged with a second connecting rod 34 through a pin. One end of the first connecting rod 32 and one end of the second connecting rod 34 are hinged with a clamping arc plate 35 through a pin. The surfaces of the multiple clamping arc plates 35 are in contact with the bottom circular arc inner wall of the detection mounting groove 2.

[0052] Specifically, during the rotation of the rotating shaft 25, the moving ring 33 with the threaded connection on the driving surface moves on the surface of the rotating shaft 25, thereby causing the second connecting rod 34 to swing. This, in conjunction with the first connecting rod 32, enables the clamping arc plate 35 to expand outward or move inward. During the outward expansion, it achieves compression installation inside the detection installation groove 2 within the precast soil pile 1, allowing the detection disk 22 to be installed in a parallel state. This facilitates the laser receiver 23 at the top of the inspection disk to receive the emitted light source from the top. During the installation of the precast soil pile 1, when tilting occurs, the entire mechanism tilts along with the precast soil pile 1. However, the light source emitted by the laser emitter 10 under the weight of the configuration ball always faces downward, causing the laser receiver 23 to be unable to receive the emitted light source. This detects the tilt of the precast soil pile 1 during operation, prompting the tilting data transmission system to perform a correction operation, thereby achieving the effect of real-time detection.

[0053] This device can be quickly clamped inside the detection and installation slot 2 before the installation of the precast soil pile 1, and can be quickly disassembled once the installation is completed to facilitate the insertion of the next precast soil pile 1, greatly improving the flexibility and efficiency of the construction process. Due to its reusability, it reduces reliance on dedicated detection equipment, lowers construction costs, and enhances the overall practicality of the equipment. Compared to the traditional method of setting sensors on the outer arc surface of the precast soil pile 1, the internal installation method avoids the problem of inability to remove sensors in soft soil foundations, reducing cost waste. Because the sensors are internally located, this design reduces the risk of damage caused by external collisions or wear during construction, thus ensuring the stability and reliability of the monitoring equipment. By avoiding damage and non-removability issues of external sensors during construction, this device reduces the cost of replacing and repairing sensors, lowering the overall construction cost. By reducing construction delays caused by sensor damage, this real-time detection mechanism 3 helps maintain construction progress and ensures timely project completion. Through real-time monitoring and correction, this device helps ensure the verticality of the precast soil pile 1, thereby improving construction quality and reducing rework and repairs due to verticality issues later on.

[0054] Step 3: Then, the piles are located and laid out. In the reinforcement area, the piles are accurately located using a total station and GPS measuring equipment, and the specific location of each precast soil pile 1 is marked. According to the pile layout drawings, the precast soil piles 1 are transported to the construction site and placed according to the marked positions.

[0055] Step 4: In the pile insertion stage, the vibratory pile driver is used to insert the precast soil piles 1 one by one into the soft soil foundation until the predetermined depth is reached. During the insertion process, the vibration and mechanical compaction of the vibratory pile driver make the soil piles tightly bonded to the surrounding soft soil. After the piles are inserted, they are filled and compacted. The gaps between the piles are filled with pre-prepared mixed improved soil, and then a compactor is used to compact the soil to ensure that the filling soil is tightly bonded to the precast soil piles 1.

[0056] Step 5: Finally, carry out follow-up treatment; after construction is completed, a professional testing agency will conduct static or dynamic load tests on the foundation to verify whether the reinforcement effect meets the design requirements; based on the test results, the roadbed will be adjusted and optimized as necessary; after confirming that there are no problems, further construction of the roadbed will be carried out.

[0057] This invention effectively improves the bearing capacity of shallow soft soil foundations, reduces environmental pollution during soft soil treatment, and accelerates construction progress. It avoids the large-scale excavation and transportation of silt in traditional soft soil treatment, significantly reducing labor intensity and project costs. It also reduces environmental pollution during construction and lowers energy consumption due to the shorter construction period. The use of precast soil piles (1) technology results in a high degree of mechanization, simple procedures, and effectively shortens construction time, reducing the uncertainty of human intervention. Through the close bond between the piles and the soil, the bearing capacity of the shallow soft soil foundation is significantly improved, ensuring the long-term stability of the roadbed.

[0058] The working principle of real-time detection: During the pile laying operation of precast soil pile 1, the real-time detection mechanism 3 is installed inside the detection installation slot 2 of the precast soil pile 1. During installation, the installation base plate 4 is first installed on the inner wall of the top of the detection installation slot 2. Then, the drive motor 18 is controlled to work, controlling the two rollers 14 to rotate synchronously and symmetrically, so that the two rollers 15 release the steel cable 16 synchronously. Then, the detection disc 22 is controlled to be lowered smoothly, driving the clamping arc plate 35 to the inner wall of the bottom of the detection installation slot 2. After the lowering is completed, the drive motor 18 is stopped, and the rotary motor 27 is controlled to work to drive the rotary shaft 25 to rotate, realizing the first connecting rod 3 2. The second connecting rod 34 swings, causing the clamping arc plate 35 to press against the inner wall of the detection installation groove 2, thereby controlling the detection disk 22 to be clamped and positioned so that its laser receiver 23 is directly below the laser transmitter 10 to receive the light source emitted by the laser transmitter 10. When the precast soil pile 1 tilts during sinking, the laser receiver 23 can no longer receive the light source emitted by the laser transmitter 10, thus determining that the precast soil pile 1 has tilted. The data transmission system is then controlled to perform a correction operation. After the operation of the precast soil pile 1 is completed, concrete is poured into the detection installation groove 2 of the precast soil pile 1 to allow for the next operation of the precast soil pile 1.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for reinforcing highway subgrade with precast soil piles without silt excavation and transportation, characterized in that: The process includes the following steps: Step 1: First, conduct a soft soil foundation survey; bring professional survey equipment to the site and use methods such as ground-penetrating radar and drilling sampling to detect in detail the depth, distribution range and soil conditions of the shallow soft soil foundation; after collecting sufficient data, combine with the geological report to delineate the specific areas that need to be reinforced. Step 2: Next, design the precast soil piles (1); based on the survey data, considering the soil characteristics and the depth of the soft foundation, determine the size, quantity and type of the precast soil piles (1); for different soil types, select different cement soil piles, lime soil piles or solidifying agent soil piles; the design parameters include: pile diameter 0.5-1 meter, pile spacing 1.5-2 meters, pile length determined according to the depth of the soft foundation, ensuring that the pile bottom is located in a stable soil layer, and a detection and installation groove (2) is opened in the middle of the precast soil piles (1), and a real-time detection mechanism (3) is installed inside the detection and installation groove (2), which realizes the action of real-time monitoring of the verticality during the installation of the precast soil piles (1); The real-time detection mechanism (3) includes a mounting base plate (4), on which a ring array of support columns (5) are mounted. A triangular top plate (6) is fixedly mounted on the top of each of the three support columns (5). A transition hole (7) is opened at the center of the top of the triangular top plate (6). A support ring (8) is fixedly mounted at the center of the bottom of the triangular top plate (6). A counterweight ball (9) is rotatably connected to the spherical inner wall of the support ring (8) and the spherical inner wall of the transition hole (7). A laser emitter (10) is fixedly mounted at the center bottom of the counterweight ball (9). The top of the mounting base (4) is also fixedly mounted with a base (12) and a U-shaped seat (13). The inner walls of both sides of the U-shaped seat (13) are rotatably connected to a roller (14) via bearings. A drum (15) is fixedly mounted on the arc surface of the roller (14). A steel cable (16) is wound around the arc surface of the drum (15). A detection disc (22) is fixedly mounted at the bottom end of each of the two steel cables (16). A laser receiver is fixedly mounted on the top of the detection disc (22). 23) A limiting sleeve (24) is fixedly installed at the bottom center of the detection disk (22). The inner wall of the limiting sleeve (24) is rotatably connected to a rotating shaft (25) through a bearing. A rotary motor (27) and an L-shaped limiting plate (28) are also fixedly installed on one side of the bottom end of the detection disk (22). A fixed connecting ring (31) is fixedly installed at the bottom end of the L-shaped limiting plate (28). Multiple first connecting rods (32) are hinged to the arc surface of the fixed connecting ring (31) through pins. The circular arc surface of the rotating shaft (25) is threaded with a movable ring (33), and the circular arc surface of the movable ring (33) is hinged with a second connecting rod (34) by a pin. One end of the first connecting rod (32) and one end of the second connecting rod (34) are hinged with a clamping arc plate (35) by a pin. Step 3: Then, the pile positioning and pile layout are carried out; in the reinforcement area, the pile positioning is carried out accurately using total station and GPS measuring equipment, and the specific location of each precast soil pile (1) is marked; according to the pile layout drawings, the precast soil piles (1) are transported to the construction site and placed according to the marked positions; Step 4: In the pile insertion stage, the vibratory pile driver is used to insert the precast soil piles (1) one by one into the soft soil foundation until the predetermined depth is reached. During the insertion process, the vibration and mechanical compaction of the vibratory pile driver make the soil piles tightly bonded with the surrounding soft soil. After the piles are inserted, they are filled and compacted. The pre-prepared mixed improved soil is filled in the gap area of ​​the piles, and then the compaction is carried out by the compaction machine to ensure that the filling soil is tightly bonded with the precast soil piles (1). Step 5: Finally, carry out follow-up treatment; after construction is completed, a professional testing agency will conduct static or dynamic load tests on the foundation to verify whether the reinforcement effect meets the design requirements; based on the test results, the roadbed will be adjusted and optimized as necessary; after confirming that there are no problems, further construction of the roadbed will be carried out.

2. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: The mounting base plate (4) is installed on the inner bottom wall of the top of the detection mounting groove (2).

3. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: The top plate of the triangular top plate (6) is fixedly installed with a limiting ring (11). The inner wall of the limiting ring (11) is adapted to the spherical surface of the counterweight ball (9). The diameter of the counterweight ball (9) is located inside the adapter hole (7).

4. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: The two U-shaped seats (13) are arranged symmetrically, the two steel cables (16) are arranged symmetrically, one end of the reel (14) passes through and extends to one end of the U-shaped seat (13), and a driven sprocket (17) is fixedly installed thereon.

5. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 4, characterized in that: A drive motor (18) is fixedly installed on the top of the base (12). The output end of the drive motor (18) is fixedly installed with a drive shaft (19) through a coupling. A drive sprocket (20) is fixedly installed on one end of the drive shaft (19). The tooth grooves of the two driven sprockets (17) are connected to the tooth grooves of the drive sprocket (20) by a chain (21). One driven sprocket (17) is located inside the chain (21), and the other driven sprocket (17) is located outside the chain (21). The rotation directions of the two driven sprockets (17) are symmetrically arranged through the transmission of the chain (21).

6. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: A driven gear (26) is fixedly installed on the top arc surface of the rotating shaft (25). A gear shaft (29) is fixedly installed on the output end of the rotating motor (27) through a coupling. A driving gear (30) is fixedly installed on the bottom end of the gear shaft (29). The teeth of the driving gear (30) mesh with the tooth grooves of the driven gear (26).

7. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: The inner wall of the fixed connecting ring (31) is rotatably connected to the bottom arc surface of the rotating shaft (25) through a bearing, and the multiple first connecting rods (32) are arranged in a ring array with the axis of the rotating shaft (25) as the center.

8. The precast soil pile reinforcement construction method for highway subgrade without silt excavation and transportation as described in claim 1, characterized in that: The surfaces of the multiple clamping arc plates (35) are in contact with the bottom arc inner wall of the detection mounting groove (2).

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