A foundation pit anchor cable angle control device and its usage method

Abstract

This invention relates to the field of foundation pit support technology, and discloses a foundation pit anchor cable angle control device and its usage method. The device includes a waist beam and anchor cables. A bracket is detachably connected to the end of the waist beam away from the foundation pit support pile via fixing bolts. The bracket has a double-layer structure, with an angle adjustment device fixedly connected to the layer closest to the waist beam. The angle adjustment device includes a hinge support, which is fixedly connected to the waist beam. Three evenly distributed annular grooves are formed on the end face of the hinge support. A spherical hinge is rotatably mounted in the hinge support. A hydraulic rod is installed in any of the grooves of the hinge support, and a pressure sensor is installed at the end of any of the hydraulic rods near the spherical hinge. A jack is bolted to the layer of the bracket away from the waist beam. The spherical hinge anchor cable, through its free rotation characteristics combined with hydraulic drive and sensor monitoring technologies, precisely adjusts the anchor cable angle. The hydraulic tensioning jack, through precise control of the hydraulic system, effectively improves the soil's anti-sliding stability.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to a foundation pit anchor cable angle control device and its usage method. Background Technology

[0002] With the acceleration of urbanization, the development of underground space is receiving increasing attention. In karst regions, the unique geological conditions such as karst caves, soil caves, and underground rivers place higher technical demands on deep foundation pit engineering. Foundation pit anchor cables, as key prestressed components in deep foundation pit support engineering, transfer tensile force to deep, stable strata such as rock layers or dense soil layers through the anchoring section, while the other end connects to support structures such as pile banks or diaphragm walls, forming an active pull-out resistance system through tensioning technology.

[0003] CN119021238A describes a prestressed anchor cable error adjustment device and its construction method. During use, the anchor cable error adjustment device uses a hydraulic jacking device to rotate the top plate around the bottom plate, allowing only single-direction angle adjustment of the anchor cable. This prevents precise adjustment of small angles in multiple directions, leading to stress concentration in localized areas of the anchor cable and reduced soil anti-sliding stability due to tension force transmission deviation. Furthermore, the accompanying accessories fail to achieve the desired anchor cable fixation effect, and after disassembling the adjustment device, the anchor cable exhibits problems such as angle rebound and insufficient tension. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides a foundation pit anchor cable angle control device and its usage method, aiming to improve the problems mentioned in the background art, such as the inability to achieve precise multi-directional adjustment of anchor cables and the rebound of the adjusted angle and insufficient tension of anchor cables after the adjustment device is disassembled.

[0005] A foundation pit anchor cable angle control device includes a waist beam and anchor cables, characterized in that: the end of the waist beam away from the foundation pit support pile is detachably connected to a bracket by a fixing bolt, the bracket is a double-layer structure and the layer closest to the waist beam is fixedly connected to an angle adjustment device.

[0006] The angle adjustment device includes a hinge support, which is fixedly connected to the waist beam and has three evenly distributed grooves in a ring on its end face. A spherical hinge is rotatably installed in the hinge support, and a hydraulic rod is installed in any of the grooves of the hinge support.

[0007] As a further description of the above technical solution: the layer of the support away from the waist beam is connected to a jack by bolts, and an anchor cable lock is provided on the side of the jack away from the support. An anchor cable lock is fixedly connected to the end of the waist beam away from the foundation pit support pile.

[0008] As a further description of the above technical solution: the anchor cable lock one and the anchor cable lock two are clip-type locks with built-in anchor rings and wedge-shaped clips, which have the advantages of high anchoring efficiency and wide environmental adaptability. High-strength anchoring is achieved through the dynamic self-locking mechanism of the wedge-shaped clips and anchor rings. They can be used in complex environments such as dampness and vibration. The materials are cost-effective and easy to maintain. By using the two locks together, the problems of anchor cable angle rebound and insufficient tension during disassembly can be solved.

[0009] As a further description of the above technical solution: the jack is a hydraulic tensioning jack. With the precise control of its hydraulic system, the tensioning error can be controlled within 1%, effectively improving the anti-sliding stability of the soil. Moreover, it comes in various models and is flexible in installation, adaptable to various foundation pit anchor cable specifications and angles. It also supports remote operation, ensuring construction safety while avoiding damage to the anchor cables and surrounding soil, thus providing reliable technical support for foundation pit engineering.

[0010] As a further description of the above technical solution: a pressure sensor is provided at one end of any of the hydraulic rods near the spherical hinge, and an angle sensor is provided in the rotating shaft of the spherical hinge. The built-in algorithm in the controller can convert the change of the anchor cable angle into a change of pressure parameter, which facilitates precise adjustment of the anchor cable angle.

[0011] As a further description of the above technical solution: the pressure sensor is a capacitive pressure sensor, which adopts a fully sealed ceramic shell and ceramic capacitor plates, and has a microsecond-level response time. It can quickly and accurately capture high-frequency dynamic pressure changes in the angle adjustment device, overcoming the response lag problem of strain gauge sensors. Furthermore, the pressure sensor adopts a fully sealed ceramic shell and ceramic capacitor plate material, which can work stably for a long time in an environment with humidity above 95%RH, and can adapt to the high humidity pit environment.

[0012] As a further description of the above technical solution: the hydraulic rod, pressure sensor and angle sensor are all electrically connected to the controller, and the angle can be adjusted through the controller.

[0013] As a further description of the above technical solution: the waist beam, bracket, hinge support and spherical hinge are all provided with through holes for the anchor cable to pass through. The through holes are inlaid with high polymer wear-resistant bushings, which can act as a buffer layer between the anchor cable and the through hole in the foundation pit anchor cable angle control device. By reducing the friction coefficient, the wear of the anchor cable is reduced, while protecting the components where the through holes are located from scratches and deformation. Moreover, the maintenance of the entire equipment can be replaced by replacing the individual bushings, thus saving costs.

[0014] A foundation pit anchor cable angle control device and its usage method are as follows:

[0015] S1: Fix the bracket to the waist beam with fixing bolts, and pass the anchor cable through the bracket through hole, the ball hinge through hole, the jack and the anchor cable lock in sequence;

[0016] S2: The controller causes the hydraulic rods to extend and retract according to a preset program, pushing the ball to rotate. At this time, the angle sensor and pressure sensor display the current angle of the ball and the pressure value of each hydraulic rod in real time. The controller uses a preset algorithm to establish the relationship between each pressure value and the angle.

[0017] S3: When the anchor cable angle does not reach the preset value, the controller is used to control each hydraulic rod to adjust the angle so that the anchor cable angle reaches the preset value. At this time, the controller is operated to stop the hydraulic rod from running.

[0018] S4: Start the jack to tension the anchor cable. After the anchor cable is tensioned, use anchor cable lock one to fix the anchor cable, and then use anchor cable lock two to fix the section of the anchor cable near the waist beam.

[0019] S5: Remove the bracket, angle adjustment device, jack and anchor cable lock by disassembling the fixing bolts and transport them to the next anchor cable for operation.

[0020] The present invention has the following beneficial effects:

[0021] 1. The spherical hinge anchor cable, through its free rotation characteristics combined with hydraulic drive and sensor monitoring technologies, can precisely adjust the anchor cable angle, adapting to multi-angle deviations during foundation pit anchor cable installation. The spherical hinge, in conjunction with the annular hydraulic rod, can accurately adjust the anchor cable angle in any direction, solving the problem that existing anchor cable angle adjustment devices can only adjust the anchor cable angle in a single direction, failing to achieve precise angle adjustment in multiple directions within a small range, resulting in stress concentration in localized areas of the anchor cable and reduced soil anti-sliding stability due to tension force transmission deviation. Its prefabricated assembly structure allows for rapid installation, greatly improving construction efficiency. Simultaneously, the integrated sensors in the controller enable digital monitoring, making it suitable for deep foundation pit support in complex geological conditions, combining construction precision and safety.

[0022] 2. Anchor cable lock 1 and anchor cable lock 2 are clip-type locks with built-in anchor rings and wedge-shaped clips. They have the advantages of high anchoring efficiency and wide environmental adaptability. High-strength anchoring is achieved through the dynamic self-locking mechanism of wedge-shaped clips and anchor rings. They can be used in complex environments such as dampness and vibration. The materials are cost-effective and easy to maintain. By using the two locks together, the problems of anchor cable angle rebound and insufficient tension during disassembly can be solved. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention;

[0024] Figure 2 A three-dimensional view of the angle adjustment device;

[0025] Figure 3 This is a cross-sectional view perpendicular to the direction of the support piles.

[0026] Legend:

[0027] 1. Waist beam; 2. Bracket; 3. Angle adjustment device; 4. Jack; 5. Anchor cable lock one; 6. Anchor cable lock two; 7. Anchor cable; 8. Fixing bolt; 31. Hinge support; 32. Spherical hinge; 33. Hydraulic rod; 34. Pressure sensor. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figure 1-3 One embodiment of the present invention provides a foundation pit anchor cable angle control device, comprising a waist beam 1 and anchor cables 7. A bracket 2 is detachably connected to the end of the waist beam 1 away from the foundation pit support pile via fixing bolts 8. The bracket 2 has a double-layer structure, with an angle adjustment device 3 fixedly connected to the layer closest to the waist beam 1. The angle adjustment device 3 includes a hinge support 31, which is fixedly connected to the waist beam 1. Three evenly distributed annular grooves are formed on the end face of the hinge support 31. A spherical hinge 3 is rotatably disposed within the hinge support 31. 2. A hydraulic rod 33 is installed in the groove of the arbitrary hinge support 31. A jack 4 is bolted to the layer of the support 2 away from the waist beam 1. An anchor cable lock 5 is installed on the side of the jack 4 away from the support 2. An anchor cable lock 6 is fixedly connected to the end of the waist beam 1 away from the foundation pit support pile. A pressure sensor 34 is installed at the end of the arbitrary hydraulic rod 33 near the spherical hinge 32. An angle sensor is installed in the rotation shaft of the spherical hinge 32. The hydraulic rod 33, pressure sensor 34 and angle sensor are all electrically connected to the controller.

[0030] The bracket 2 is fixed to the waist beam 1 by fixing bolt 8. The anchor cable is passed through the through hole of bracket 2, the through hole of spherical hinge 32, jack 4 and anchor cable lock 5 in sequence. The controller is operated to make the hydraulic rod 33 extend and retract according to the preset program, pushing the ball to rotate. At this time, the angle sensor and pressure sensor 34 display the current angle of the ball and the pressure value of each hydraulic rod 33 in real time. The controller establishes the relationship between each pressure value and the angle through a preset algorithm. When the angle does not reach the preset value, the controller controls each hydraulic rod 33 to adjust the angle. When the angle reaches the preset value ( For example, when the anchor cable is perpendicular to the waist beam, immediately operate the controller to stop the hydraulic rod 33 from moving. Then, start the jack 4 to tension the anchor cable. After tensioning, use the anchor cable lock 5 to fix the anchor cable, and then use the anchor cable lock 6 to fix the section of the anchor cable near the waist beam. Finally, remove the fixing bolts 8 to disassemble the bracket 2, angle adjustment device 3, jack 4, and anchor cable lock 5 together, and transport them to the next anchor cable location for operation. In this device, each hydraulic rod 33 pushes the ball by extending and retracting the piston rod. Multiple hydraulic rods 33 can change the pushing force by using different combinations of extension and retraction. The spherical hinge 32 is precisely controlled by a force direction difference. An angle sensor is installed on the rotation axis of the spherical hinge 32 to monitor the spherical angle in real time and feed the data back to the controller. The controller compares this data with the design angle and automatically calculates the extension and retraction of each hydraulic cylinder through a preset algorithm. At the same time, the pressure sensor 34 monitors the thrust of each hydraulic cylinder to ensure that the thrust of each cylinder is balanced. The spherical hinge anchor cable, through its free rotation characteristics combined with hydraulic drive and sensor monitoring technologies, can precisely adjust the anchor cable angle to adapt to multi-angle deviations in the installation of foundation pit anchor cables. The spherical hinge and the ring hydraulic rod work together to accurately adjust the angle of the anchor cable in any direction. This solves the problem that the existing anchor cable angle adjustment device can only adjust the anchor cable angle in a single direction and cannot achieve precise adjustment in a small range in multiple directions, resulting in stress concentration in the local area of ​​the anchor cable and a decrease in the anti-sliding stability of the soil due to the deviation of the tension force transmission. Its prefabricated assembly structure can be installed quickly, greatly improving construction efficiency. At the same time, the integrated sensors in the controller realize digital monitoring, which is suitable for deep foundation pit support in complex geology, combining construction accuracy and safety.

[0031] Anchor cable lock 1 (5) and anchor cable lock 2 (6) are clip-type locks with built-in anchor rings and wedge-shaped clips. They have the advantages of high anchoring efficiency and wide environmental adaptability. High-strength anchoring is achieved through the dynamic self-locking mechanism of the wedge-shaped clips and anchor rings. They can be used in complex environments such as dampness and vibration. The materials are cost-effective and easy to maintain. By using the two locks together, the problems of anchor cable angle rebound and insufficient tension during disassembly can be solved.

[0032] The jack 4 is a hydraulic tensioning jack. With the precise control of its hydraulic system, the tensioning error can be controlled within 1%, which effectively improves the anti-sliding stability of the soil. It is also available in various models and is flexible in installation. It can be adapted to various foundation pit anchor cable specifications and angles. At the same time, it supports remote operation. While ensuring construction safety, it avoids damage to the anchor cable and surrounding soil, providing reliable technical support for foundation pit engineering.

[0033] The pressure sensor 34 is a capacitive pressure sensor with a microsecond-level response time, which can quickly and accurately capture high-frequency dynamic pressure changes in the angle adjustment device, overcoming the response lag problem of strain gauge sensors. Furthermore, the pressure sensor 34 adopts a fully sealed ceramic shell and ceramic capacitor plate material, which can work stably for a long time in an environment with humidity above 95%RH, and can adapt to the high humidity pit environment.

[0034] The waist beam 1, bracket 2, hinge support 31 and spherical hinge 32 are all provided with through holes for the anchor cable 7 to pass through. The through holes are inlaid with high polymer wear-resistant bushings, which can act as a buffer layer between the anchor cable 7 and the through hole in the foundation pit anchor cable angle control device. By reducing the friction coefficient, the wear of the anchor cable 7 is reduced, while protecting the components where the through holes are located from scratches and deformation. Moreover, the maintenance of the entire equipment can be replaced by replacing the individual bushings, thus saving costs.

[0035] Working principle: The bracket 2 is fixed to the waist beam 1 by the fixing bolt 8. The anchor cable is passed through the through hole of the bracket 2, the through hole of the spherical hinge 32, the jack 4, and the anchor cable lock 5 in sequence. The controller is operated to make the hydraulic rod 33 extend and retract according to the preset program, pushing the ball to rotate. At this time, the angle sensor and the pressure sensor 34 display the current angle of the ball and the pressure value of each hydraulic rod 33 in real time. The controller establishes the relationship between each pressure value and the angle through a preset algorithm. When the angle does not reach the preset value, the controller controls each hydraulic rod 33 to adjust the angle. When the angle reaches the preset value (for example, the anchor cable is perpendicular to the waist beam), the controller is immediately operated to stop the hydraulic rod 33. Then, the jack 4 is started to tension the anchor cable. After the anchor cable is tensioned, the anchor cable lock 5 is used to fix the anchor cable. Then, the anchor cable near the waist beam is fixed using anchor cable lock 6. Finally, the bracket 2, angle adjustment device 3, jack 4 and anchor cable lock 5 are disassembled together by removing the fixing bolts 8 and transported to the next anchor cable for operation. In this device, each hydraulic rod 33 pushes the ball by the extension and retraction of the piston rod. Multiple hydraulic rods 33 change the thrust direction difference by different combinations of extension and retraction, thereby accurately controlling the rotation angle of the spherical hinge 32. Angle sensor is installed on the rotation axis of the spherical hinge 32 to monitor the ball angle in real time and feed the data back to the controller. The controller compares this data with the design angle and automatically calculates the extension and retraction of each hydraulic cylinder through a preset algorithm. At the same time, pressure sensor 34 monitors the thrust of each hydraulic cylinder to ensure that the thrust of each cylinder is balanced.

Claims

1. A foundation pit anchor cable angle control device, comprising a waist beam (1) and an anchor cable (7), characterized in that: The waist beam (1) is detachably connected to a bracket (2) at the end away from the foundation pit support pile by a fixing bolt (8). The bracket (2) is a double-layer structure and an angle adjustment device (3) is fixedly connected to the layer closest to the waist beam (1). The angle adjustment device (3) includes a hinge support (31), which is fixedly connected to the waist beam (1) and has three evenly distributed grooves in a ring on the end face of the hinge support (31). A spherical hinge (32) is rotatably arranged in the hinge support (31), and a hydraulic rod (33) is arranged in any groove of the hinge support (31).

2. The foundation pit anchor cable angle control device according to claim 1, characterized in that: The support (2) is connected to a jack (4) by bolts on the layer away from the waist beam (1). An anchor cable lock one (5) is provided on the side of the jack (4) away from the support (2). An anchor cable lock two (6) is fixedly connected to the end of the waist beam (1) away from the foundation pit support pile.

3. The foundation pit anchor cable angle control device according to claim 2, characterized in that: The anchor cable lock one (5) and anchor cable lock two (6) are clip-type locks with built-in anchor rings and wedge-shaped clips.

4. The foundation pit anchor cable angle control device according to claim 2, characterized in that: The jack (4) is a hydraulic tensioning jack.

5. A foundation pit anchor cable angle control device according to any one of claims 1 to 4, characterized in that: A pressure sensor (34) is provided at one end of any of the hydraulic rods (33) near the spherical hinge (32), and an angle sensor is provided in the rotation shaft of the spherical hinge (32).

6. The foundation pit anchor cable angle control device according to claim 5, characterized in that: The pressure sensor (34) is a capacitive pressure sensor, which is encapsulated in a fully sealed ceramic shell and uses a ceramic capacitor plate.

7. The foundation pit anchor cable angle control device according to claim 5, characterized in that: The hydraulic rod (33), pressure sensor (34) and angle sensor are all electrically connected to the controller.

8. The foundation pit anchor cable angle control device according to claim 5, characterized in that: The waist beam (1), bracket (2), hinge support (31) and spherical hinge (32) are all provided with through holes for the anchor cable (7) to pass through, and the through holes are inlaid with polymer wear-resistant bushings.

9. A foundation pit anchor cable angle control device and its usage method, including a foundation pit anchor cable angle control device as described in any one of claims 1 to 8, characterized in that: The usage method is as follows: S1: Fix the bracket (2) to the waist beam (1) by fixing bolt (8), and pass the anchor cable (7) through the through hole of the bracket (2), the through hole of the ball hinge (32), the jack (4) and the anchor cable lock (5) in sequence. S2: The controller operates to make the hydraulic rod (33) extend and retract according to the preset program, pushing the ball to rotate. At this time, the angle sensor and pressure sensor (34) display the current angle of the ball and the pressure value of each hydraulic rod (33) in real time. The controller uses the preset algorithm to establish the relationship between each pressure value and the angle. S3: When the angle of the anchor cable (7) does not reach the preset value, the controller is used to control each hydraulic rod (33) to adjust the angle so that the angle of the anchor cable (7) reaches the preset value. At this time, the controller is operated to stop the hydraulic rod (33) from running. S4: Start the jack (4) to tighten the anchor cable (7). After the anchor cable (7) is tightened, use the anchor cable lock one (5) to fix the anchor cable, and then use the anchor cable lock two (6) to fix the section of the anchor cable (7) near the waist beam (1). S5: Remove the bracket (2), angle adjustment device (3), jack (4) and anchor lock (5) by disassembling the fixing bolts (8) and transport them to the next anchor (7) for operation.

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