A deep foundation steel support axial force compensation self-locking booster jack

Abstract

The utility model discloses a kind of deep foundation pit steel support axial force compensation self-locking type booster jack, including controller, cylinder body, piston rod, ball head and top plate.The utility model, by integrated displacement, vibration, inclination detection structure and intelligent alarm structure, high-precision axial force compensation and dynamic load adaptability are realized.Non-Newtonian fluid buffer structure significantly improves the reliability and durability of equipment in complex environment.At the same time, multi-color LED alarm function simplifies field operation and maintenance, reduces the difficulty of manual inspection.The overall scheme has significant advantages in safety, intelligence, economy and other aspects, and is suitable for high-risk engineering scenarios such as near-metro deep foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of pressure boosting jacks, and in particular to a self-locking pressure boosting jack for axial force compensation of steel support in deep foundation pits. Background Technology

[0002] With the rapid advancement of urban rail transit construction and the increasing constraints on land resources, deep foundation pit projects adjacent to subway tunnels are showing a trend towards larger scale and greater excavation depth.

[0003] Currently, deep foundation pit projects commonly employ the open-cut method, which generates significant environmental effects. Monitoring data indicates that when the lateral displacement of the foundation pit exceeds 30mm, the deformation of the adjacent subway tunnel track surface will exceed the 5mm operational safety threshold.

[0004] Therefore, controlling the safety impact of ultra-deep foundation pit construction on adjacent subways has gradually evolved into one of the main directions of modern foundation pit engineering research. Generally, when using steel supports, prestress is applied according to design requirements. However, during construction, due to the creep effect of the steel supports and temperature stress, the axial force attenuation rate can reach 0.5%-1.2% per day. Especially after the excavation face has been exposed for more than 72 hours, the axial force loss generally exceeds 40% of the design prestress. Moreover, it is difficult to apply support axial force at this time, thus causing wall displacement. Excessive displacement will directly affect the safety of the subway operating next to the foundation pit. To address this, a technology on the market proposes a self-locking pressure booster jack for axial force compensation of deep foundation pit steel supports, comprising: a first piston rod passing through a first guide sleeve and fitted into a cylinder body; and a second piston rod passing through a second guide sleeve and fitted into an axial cavity within the first piston rod. The advantages of this patent are that it reduces the size and weight of the jack and improves its overall integrity and safety reliability. However, the application of the above-disclosed technology also has certain drawbacks: First, relying on mechanical safety valves (such as threaded trigger unloading) or single-chamber hydraulic control, it is impossible to monitor the piston rod displacement in real time, resulting in lag in axial force compensation, which can easily lead to excessive lateral displacement of the foundation pit and threaten the safety of adjacent subway tunnels. Second, it cannot identify vibrations or sudden loads from nearby subways, resulting in passive response of axial force compensation and difficulty in preventing dynamic deformation. Third, the steel support relies solely on manual inspection to determine tilt, which cannot detect the jack's attitude deviation in real time. This can easily lead to local stress concentration due to support eccentricity, and the connection between the top block and the screw rod is rigid and lacks buffering. Therefore, it is necessary to optimize and improve the structure of the deep foundation pit steel support axial force compensation self-locking booster jack. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a self-locking pressure booster jack for axial force compensation in deep foundation pit steel supports.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits, comprising a controller, a cylinder, a piston rod, a ball head, and a top plate. The piston rod is slidably connected to the inner side wall of the cylinder, and the upper end of the piston rod penetrates through the upper wall of the cylinder and extends above the cylinder. A groove is provided at the upper end of the piston rod, and the ball head is rotatably connected to the inner side wall of the groove. A buffer structure is provided between the ball head and the piston rod. The top plate is fixedly connected to the upper side of the ball head. A waterproof box is fixedly connected to the front wall of the cylinder. A displacement detection structure for detecting the displacement of the piston rod during support is provided between the waterproof box and the piston rod. A vibration detection structure for detecting the vibration of the area where the cylinder is located is provided inside the waterproof box. An inclination detection structure for detecting the tilt of the cylinder is provided on the lower inner wall of the waterproof box. An alarm structure is provided on the front wall of the waterproof box.

[0007] As a further description of the above technical solution:

[0008] The buffer structure is a non-Newtonian fluid, which is disposed between the outer wall of the ball head and the inner wall of the groove.

[0009] As a further description of the above technical solution:

[0010] The piston rod is threaded to a cap at its upper end, the ball head is limited by the cap, and a seal is provided between the cap and the ball head.

[0011] As a further description of the above technical solution:

[0012] The displacement detection structure includes a magnetostrictive sensor, a connecting rod, and a sliding sleeve. The sliding sleeve is slidably connected to the outer wall of the piston rod, and the sliding sleeve and the piston rod are fixed together by screws. A connecting block is fixedly connected to the front wall of the sliding sleeve, and the connecting rod is fixedly connected to the front wall of the connecting block. A retaining sleeve is fixedly connected to the upper inner wall of the waterproof box. The lower end of the connecting rod passes through the upper wall of the waterproof box and the inner wall of the retaining sleeve in sequence and extends to below the retaining sleeve. The connecting rod is slidably connected to the inner wall of the retaining sleeve. The magnetostrictive sensor is fixedly connected to the rear inner wall of the waterproof box and close to the upper wall of the waterproof box. The rear wall of the connecting rod and the position near the lower end are connected to the movement detection part of the magnetostrictive sensor. The magnetostrictive sensor is electrically connected to the controller.

[0013] As a further description of the above technical solution:

[0014] The vibration detection structure is a vibration sensor, which is fixedly connected to the inner rear wall of the waterproof box and close to the lower wall of the waterproof box. The vibration sensor is electrically connected to the controller.

[0015] As a further description of the above technical solution:

[0016] The tilt detection structure is a tilt sensor, which is fixedly connected to the lower inner wall of the waterproof tank and is electrically connected to the controller.

[0017] As a further description of the above technical solution:

[0018] The alarm structure includes a lamp holder, a lamp cover, and multiple sets of LED beads. The lamp holder is fixedly connected to the front wall of the waterproof box, and the lamp cover is threadedly connected to the front wall of the lamp holder. A circuit board is fixedly connected to the front wall of the lamp holder and inside the lamp cover. The multiple sets of LED beads are all fixedly connected to the front wall of the circuit board. The LED beads are RGBW four-in-one LED beads, and the multiple sets of LED beads are all electrically connected to the controller.

[0019] This utility model has the following beneficial effects:

[0020] Compared to existing technologies, this deep foundation pit steel support axial force compensation self-locking booster jack achieves high-precision axial force compensation and dynamic load adaptability by integrating displacement, vibration, and tilt angle detection structures with an intelligent alarm system. The non-Newtonian fluid buffer structure significantly improves the equipment's reliability and durability in complex environments. Simultaneously, the multi-color LED alarm function simplifies on-site maintenance and reduces the difficulty of manual inspection. The overall solution offers significant advantages in safety, intelligence, and economy, making it suitable for high-risk engineering scenarios such as deep foundation pits near subway lines. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits, as proposed in this utility model.

[0022] Figure 2 This is a partial sectional view of the piston rod, pressure cap, and ball head connection structure of a self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits, as proposed in this utility model.

[0023] Figure 3 This is a side sectional view of the lamp holder and lamp cover connection structure of a deep foundation pit steel support axial force compensation self-locking booster jack proposed in this utility model.

[0024] Figure 4 This is a partial sectional view of the internal structure of the waterproof box of a self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits, as proposed in this utility model.

[0025] Legend:

[0026] 1. Cylinder block; 2. Piston rod; 3. Pressure cap; 4. Ball head; 5. Top plate; 6. Sliding sleeve; 7. Connecting block; 8. Connecting rod; 9. Waterproof box; 10. Lamp holder; 11. Lamp cover; 12. Non-Newtonian fluid; 13. Circuit board; 14. LED beads; 15. Retaining sleeve; 16. Magnetostrictive sensor; 17. Vibration sensor; 18. Tilt sensor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Reference Figures 1 to 4 The present invention provides a self-locking booster jack for axial force compensation of steel support in deep foundation pit: including a controller, a cylinder 1, a piston rod 2, a ball head 4 and a top plate 5. The piston rod 2 is slidably connected to the inner wall of the cylinder 1. The upper end of the piston rod 2 passes through the upper wall of the cylinder 1 and extends to the top of the cylinder 1. A groove is provided at the upper end of the piston rod 2, and the ball head 4 is rotatably connected to the inner wall of the groove.

[0029] To address the issue of traditional rigid ball joint 4 being susceptible to impact damage and to improve buffering performance under dynamic loads, a buffer structure is provided between the ball joint 4 and the piston rod 2. The buffer structure is a non-Newtonian fluid 12, which is disposed between the outer wall of the ball joint 4 and the inner wall of the groove. A pressure cap 3 is threaded to the upper end of the piston rod 2, and the ball joint 4 is limited by the pressure cap 3. A seal is provided between the pressure cap 3 and the ball joint 4. The non-Newtonian fluid 12 maintains low fluidity under normal conditions, but hardens instantly to absorb energy during impact, effectively dispersing the impact of sudden loads. The pressure cap 3 and the seal prevent fluid leakage and ensure long-term and stable buffering performance.

[0030] To monitor the displacement of piston rod 2 in real time, accurately compensate for axial force attenuation, and prevent support instability caused by hydraulic failure, top plate 5 is fixedly connected to the upper wall of ball head 4. A waterproof box 9 is fixedly connected to the front wall of cylinder body 1. A displacement detection structure for detecting the displacement of piston rod 2 during support is provided between the waterproof box 9 and piston rod 2. The displacement detection structure includes a magnetostrictive sensor 16, a connecting rod 8, and a sliding sleeve 6. The sliding sleeve 6 is slidably connected to the outer wall of piston rod 2 and fixed to piston rod 2 by screws. A connecting block 7 is fixedly connected to the front wall of the sliding sleeve 6, and the connecting rod 8 is fixedly connected to the front wall of the connecting block 7. A retaining sleeve 15 is fixedly connected to the upper inner wall of the waterproof box 9. The lower end of rod 8 passes through the upper wall of waterproof box 9 and the inner wall of retaining sleeve 15 in sequence and extends to the bottom of retaining sleeve 15. The connecting rod 8 is slidably connected to the inner wall of retaining sleeve 15. Magnetostrictive sensor 16 is fixedly connected to the inner rear wall of waterproof box 9 and close to the upper wall of waterproof box 9. The rear wall of connecting rod 8 and the position near the lower end are connected to the movement detection part of magnetostrictive sensor 16. Magnetostrictive sensor 16 is electrically connected to controller. The rigid linkage between sliding sleeve 6 and connecting rod 8 ensures displacement transmission accuracy, enabling magnetostrictive sensor 16 to achieve ±0.1mm level displacement monitoring. Combined with the controller's real-time compensation of axial force, the support displacement control error is reduced to less than 30% of that of traditional technology.

[0031] To capture dynamic load characteristics such as subway vibration, trigger pressurization compensation in advance, and prevent sudden deformation, the waterproof box 9 is equipped with a vibration detection structure for detecting the vibration of the cylinder 1 in the area. The vibration detection structure is a vibration sensor 17, which is fixedly connected to the inner rear wall of the waterproof box 9 and close to the lower wall of the waterproof box 9. The vibration sensor 17 is electrically connected to the controller. The vibration sensor 17 locks the 20-50Hz subway vibration signal through frequency band filtering, triggering the controller to increase the pressure by 5%-10% within 0.5 seconds to offset the axial force attenuation caused by vibration. The displacement of the adjacent subway tunnel is reduced by more than 40%. At the same time, the system can also perform machine learning through the controller to filter out construction vibration signals and avoid false alarms.

[0032] To monitor the jack's attitude deviation in real time and avoid local stress concentration caused by support eccentricity, a tilt detection structure for detecting the tilt of cylinder 1 is provided on the lower inner wall of the waterproof box 9. The tilt detection structure is a tilt sensor 18, which is fixedly connected to the lower inner wall of the waterproof box 9. The tilt sensor 18 is electrically connected to the controller. The tilt sensor 18 feeds back the tilt data of cylinder 1 with an accuracy of ±0.1°. Combined with the controller to adjust the support layout, the support alignment deviation is controlled within ±2mm, reducing component fatigue damage caused by eccentricity.

[0033] To visually display fault types and improve the efficiency of fault identification and handling by on-site personnel, an alarm structure is installed on the front wall of the waterproof box 9. The alarm structure includes a lamp holder 10, a lamp cover 11, and multiple sets of LED beads 14. The lamp holder 10 is fixedly connected to the front wall of the waterproof box 9, and the lamp cover 11 is threadedly connected to the front wall of the lamp holder 10. A circuit board 13 is fixedly connected to the front wall of the lamp holder 10 and inside the lamp cover 11. Multiple sets of LED beads 14 are fixedly connected to the front wall of the circuit board 13. The LED beads 14 are RGBW four-in-one LED beads. Multiple sets of LED beads 14 are electrically connected to the controller. The LED beads 14 encode various fault types through a combination of color and flashing frequency (such as red light flashing fast = hydraulic leakage, yellow light flashing slowly = tilt angle exceeding limit). On-site personnel can quickly identify faults within 50 meters, and the average fault response time is shortened to less than 10 minutes.

[0034] Working principle: The non-Newtonian fluid 12 maintains low fluidity under normal conditions, but hardens instantly upon impact to absorb energy, effectively dispersing sudden load impacts. The gland 3, combined with the seal, prevents fluid leakage and ensures long-term stable buffering performance. The rigid linkage between the sliding sleeve 6 and the connecting rod 8 ensures accurate displacement transmission, enabling the magnetostrictive sensor 16 to monitor displacement at the ±0.1mm level. Combined with the controller's real-time compensation of axial force, the support displacement control error is reduced to less than 30% of that of traditional technologies. The vibration sensor 17 uses frequency band filtering to lock onto the 20-50Hz subway vibration signal, triggering the controller to increase the pressure by 5%-10% within 0.5 seconds to counteract the vibration-induced vibration. The axial force is reduced, and the displacement of the adjacent subway tunnel is reduced by more than 40%. At the same time, the system can also perform machine learning through the controller to filter out construction vibration signals and avoid false alarms. The tilt sensor 18 feeds back the tilt data of the cylinder 1 with an accuracy of ±0.1°. Combined with the controller to adjust the support layout, the support centering deviation is controlled within ±2mm, reducing component fatigue damage caused by eccentricity. The LED beads 14 encode various fault types through a combination of color and flashing frequency (such as red light flashing fast = hydraulic leakage, yellow light flashing slowly = tilt angle exceeding limit). On-site personnel can quickly identify faults within 50 meters, and the average fault response time is shortened to less than 10 minutes.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking pressure booster jack for axial force compensation in deep foundation pit steel support, characterized in that: The system includes a controller, a cylinder (1), a piston rod (2), a ball head (4), and a top plate (5). The piston rod (2) is slidably connected to the inner wall of the cylinder (1). The upper end of the piston rod (2) passes through the upper wall of the cylinder (1) and extends above the cylinder (1). The upper end of the piston rod (2) is provided with a groove. The ball head (4) is rotatably connected to the inner wall of the groove. A buffer structure is provided between the ball head (4) and the piston rod (2). The top plate (5) is fixedly connected to the upper wall of the ball head (4). A waterproof box (9) is fixedly connected to the front wall of the cylinder (1). A displacement detection structure for detecting the displacement of the piston rod (2) when it is supported is provided between the waterproof box (9) and the piston rod (2). A vibration detection structure for detecting the vibration of the area where the cylinder (1) is located is provided inside the waterproof box (9). An inclination detection structure for detecting the tilt of the cylinder (1) is provided on the lower inner wall of the waterproof box (9). An alarm structure is provided on the front wall of the waterproof box (9).

2. The self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits according to claim 1, characterized in that: The buffer structure is a non-Newtonian fluid (12), which is disposed between the outer wall of the ball head (4) and the inner wall of the groove.

3. The deep foundation pit steel support axial force compensation self-locking booster jack according to claim 2, characterized in that: The piston rod (2) is threadedly connected to a pressure cap (3) at its upper end. The ball head (4) is limited by the pressure cap (3). A sealing element is provided between the pressure cap (3) and the ball head (4).

4. The self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits according to claim 3, characterized in that: The displacement detection structure includes a magnetostrictive sensor (16), a connecting rod (8), and a sliding sleeve (6). The sliding sleeve (6) is slidably connected to the outer wall of the piston rod (2). The sliding sleeve (6) and the piston rod (2) are fixed together by screws. A connecting block (7) is fixedly connected to the front wall of the sliding sleeve (6). The connecting rod (8) is fixedly connected to the front wall of the connecting block (7). A retaining sleeve (15) is fixedly connected to the upper inner wall of the waterproof box (9). The lower end of the connecting rod (8) passes through the upper wall of the waterproof box (9) and the inner wall of the retaining sleeve (15) in sequence and extends to the bottom of the retaining sleeve (15). The connecting rod (8) is slidably connected to the inner wall of the retaining sleeve (15). The magnetostrictive sensor (16) is fixedly connected to the rear inner wall of the waterproof box (9) and close to the upper wall of the waterproof box (9). The rear wall of the connecting rod (8) and the position near the lower end are connected to the movement detection part of the magnetostrictive sensor (16). The magnetostrictive sensor (16) is electrically connected to the controller.

5. The self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits according to claim 4, characterized in that: The vibration detection structure is a vibration sensor (17), which is fixedly connected to the inner rear wall of the waterproof box (9) and close to the lower wall of the waterproof box (9). The vibration sensor (17) is electrically connected to the controller.

6. The self-locking pressure booster jack for axial force compensation of steel support in deep foundation pits according to claim 5, characterized in that: The tilt detection structure is a tilt sensor (18), which is fixedly connected to the lower inner wall of the waterproof box (9) and is electrically connected to the controller.

7. A self-locking pressure booster jack for axial force compensation in deep foundation pit steel support according to claim 6, characterized in that: The alarm structure includes a lamp holder (10), a lamp cover (11), and multiple sets of LED beads (14). The lamp holder (10) is fixedly connected to the front wall of the waterproof box (9). The lamp cover (11) is threadedly connected to the front wall of the lamp holder (10). A circuit board (13) is fixedly connected to the front wall of the lamp holder (10) and inside the lamp cover (11). Multiple sets of LED beads (14) are fixedly connected to the front wall of the circuit board (13). The LED beads (14) are RGBW four-in-one LED beads. Multiple sets of LED beads (14) are electrically connected to the controller.

Images