Self-adaptive reinforcing device and method for H-shaped steel foundation pit supporting structure

Abstract

The invention discloses an H-shaped steel foundation pit supporting structure self-adaptive reinforcing device and method, and relates to the technical field of foundation pit supporting, the H-shaped steel foundation pit supporting structure self-adaptive reinforcing device comprises a first mounting base, a second mounting base, a bending monitoring assembly and a pair of symmetrically arranged self-adaptive reinforcing assemblies, the first mounting base and the second mounting base are respectively arranged on two sides of the connecting steel plate; the two ends of the bending monitoring assembly are arranged on the first mounting base and the second mounting base correspondingly, and the bending monitoring assembly is used for monitoring bending deformation of the joint of the H-shaped steel body; the self-adaptive reinforcing assembly is connected with the side face of the first mounting base and the side face of the second mounting base. Through cooperation of the bending monitoring assembly and the self-adaptive reinforcing assembly, the bending monitoring assembly can capture fine bending deformation at the joint of the H-shaped steel body in real time, the self-adaptive reinforcing assembly quickly responds to and accurately adjusts compensation force and efficiently counteracts deformation according to monitoring signals, and the stability of a foundation pit supporting structure is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to an adaptive reinforcement device and method for H-shaped steel foundation pit support structure. Background Technology

[0002] In deep foundation pit support engineering, H-beams are widely used as the main load-bearing components of the support structure due to their excellent cross-sectional mechanical properties and convenient construction. In actual projects, H-beams are usually spliced ​​end to end to form a continuous retaining wall to resist the soil pressure and water pressure on the sidewalls of the foundation pit. However, under the action of foundation pit excavation or external loads, the support structure is prone to deformation due to factors such as soil instability and uneven soil and water pressure. In particular, the joints of H-beams often become weak points of stress concentration due to abrupt changes in connection stiffness. Although traditional rigid connection methods (such as welding and bolt fixing) can ensure initial strength, in the asymmetric deformation caused by foundation pit instability, the joints are difficult to adaptively adjust the stress state, which can easily lead to local bending, tearing, or even overall overturning, seriously threatening the safety of the project.

[0003] In existing technologies, compensation measures for H-beam joint deformation mostly employ passive reinforcement methods, such as adding support beams or anchor cable systems. However, these methods have fixed directions of action and lack dynamic response capabilities, making it difficult to match the complex stress state at the joint caused by soil lateral displacement in real time. Furthermore, some solutions enhance deformation resistance by adding redundant connectors, but these methods not only increase material costs and construction difficulty but may also lead to abnormal redistribution of internal forces due to excessive constraint. Therefore, how to achieve proactive sensing and adaptive compensation of the stress state at H-beam joints has become a key technical bottleneck in improving the toughness and safety of foundation pit support structures.

[0004] Therefore, in response to the above phenomenon, an adaptive reinforcement device and method for H-shaped steel foundation pit support structure is proposed to meet the needs of practical use. Summary of the Invention

[0005] This invention provides an adaptive reinforcement device and method for H-shaped steel foundation pit support structures, which solves the technical problem that current reinforcement methods lack dynamic response capabilities and are difficult to match the stress state caused by soil lateral displacement at the joints in real time.

[0006] To address the aforementioned technical problems, this invention provides an adaptive reinforcement device and method for an H-beam foundation pit support structure, comprising a first mounting base, a second mounting base, a bending monitoring component, and a pair of symmetrically arranged adaptive reinforcement components. The device connects two H-beam bodies spliced ​​together by connecting steel plates. The first and second mounting bases are respectively disposed on opposite sides of the connecting steel plates. The bending monitoring components are respectively disposed at both ends on the first and second mounting bases, and are used to monitor bending deformation at the joints of the H-beam bodies. The adaptive reinforcement components are connected to the sides of the first and second mounting bases, and adjust the compensation force to counteract deformation in response to the monitoring signal from the bending monitoring components.

[0007] Furthermore, the bending monitoring assembly includes an angle sensor, a measuring rod, a first mounting base, a second mounting base, and a sleeve; the angle sensor is disposed on the first mounting base, the sleeve is disposed on the second mounting base, one end of the measuring rod is fixed to the monitoring end of the angle sensor, and the other end is inserted into the sleeve and slidably engaged along the axial direction; the first mounting base and the second mounting base are respectively disposed on the top of the first mounting base and the second mounting base.

[0008] Furthermore, the adaptive reinforcement component includes a servo motor, a reducer, a winding drum, a first fixed pulley, a wire rope, and a second fixed pulley; the servo motor is vertically mounted on the second mounting base, the reducer is located at the output end of the servo motor, and the reducer drives and connects to the winding drum; the wire rope is sequentially wound around the first fixed pulley and the second fixed pulley, and both ends are fixed to the winding drum; the grooves of the first fixed pulley and the second fixed pulley are multi-strand spiral grooves to accommodate the multi-directional deflection of the wire rope.

[0009] Furthermore, the two ends of the wire rope are symmetrically arranged around the centerline of the winding drum to balance the force.

[0010] Furthermore, both the first mounting base and the second mounting base include a connecting U-shaped plate, a pair of symmetrically arranged reinforcing bases, and a first mounting ear for mounting the first fixed pulley. The connecting U-shaped plate is bolted to the H-beam body. The two reinforcing bases are respectively arranged on both sides of the connecting U-shaped plate. The first mounting ear is arranged on the reinforcing base. The second mounting base also includes a second mounting ear for mounting the winding drum, which is arranged on the reinforcing base.

[0011] Furthermore, the adaptive hardening component also includes a controller, the servo motor is electrically connected to the controller, and the controller adjusts the rotation angle of the servo motor output end according to the signal from the angle sensor.

[0012] This invention also provides an adaptive reinforcement method for H-shaped steel foundation pit support structures, comprising the following steps:

[0013] Step S1: Monitor the bending direction and deformation at the joint of the H-beam body in real time using the bending monitoring component;

[0014] Step S2: When the deformation exceeds the trigger threshold based on the monitoring data, the controller sends a compensation command to the servo motor of the adaptive reinforcement component on one side, driving the wire rope to tighten and apply a compensation force to the two H-beam bodies.

[0015] Step S3: Repeat steps S1-S2 until the deformation detected by the bending monitoring component is less than the protection threshold, thus achieving internal force balance at the joint.

[0016] Furthermore, in step S2: the magnitude of the wire rope compensation displacement is proportional to the deflection angle, and the compensation force directions of the two adaptive reinforcement components are symmetrically distributed on both sides of the neutral axis of the H-beam body.

[0017] Furthermore, in step S2: simultaneously, a command with the opposite direction and the same magnitude as the compensation command is sent to the servo motor of another adaptive reinforcement component, causing the steel wire rope of the adaptive reinforcement component to loosen by a corresponding length.

[0018] Compared with related technologies, the adaptive reinforcement device and method for H-shaped steel foundation pit support structure provided by the present invention has the following beneficial effects:

[0019] This invention provides an adaptive reinforcement device and method for H-beam steel foundation pit support structures. Through the cooperation of a bending monitoring component and an adaptive reinforcement component, the bending monitoring component can capture minute bending deformations at the joints of the H-beam body in real time, while the adaptive reinforcement component responds quickly and precisely adjusts the compensation force based on the monitoring signals, efficiently offsetting deformation and significantly improving the stability of the foundation pit support structure. The first and second mounting bases are welded from Q345B steel plates, with anti-slip serrations on the inner wall of the connecting U-shaped plate, and are connected with high-strength bolts to ensure a firm bond between the device and the H-beam body, enhancing the overall structural reliability.

[0020] This invention provides an adaptive reinforcement device and method for H-shaped steel foundation pit support structure. In terms of technical parameter selection, the high resolution of the angle sensor ensures accurate deformation monitoring, and the reasonable configuration of servo motor and steel wire rope can provide sufficient compensation force and stable operation.

[0021] This invention provides an adaptive reinforcement device and method for H-shaped steel foundation pit support structures. The threshold setting is scientific, the trigger threshold balances response sensitivity and stability, reinforcement is initiated in a timely manner, and the protection threshold avoids system misjudgment and frequent motor start-stop. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the adaptive hardening component structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the side structure of the adaptive reinforcement component of the present invention;

[0025] Figure 4 This is a schematic diagram of the mounting base structure of the present invention;

[0026] Figure 5 This is a schematic diagram of one end of the bending monitoring component of the present invention;

[0027] Figure 6 This is a schematic diagram of the other end of the bending monitoring component of the present invention.

[0028] The following are the labeling elements in the diagram: 100, H-beam body; 101, connecting steel plate; 1, first mounting base; 2, second mounting base; 3, bending monitoring component; 4, adaptive reinforcement component; 21, connecting U-shaped plate; 22, reinforced base; 23, first mounting ear; 24, second mounting ear; 31, angle sensor; 32, measuring rod; 33, first mounting seat; 34, second mounting seat; 35, sleeve; 41, servo motor; 42, reducer; 43, winding drum; 44, first fixed pulley; 45, wire rope; 46, second fixed pulley. Detailed Implementation

[0029] Example 1

[0030] This embodiment provides an adaptive reinforcement device and method for H-shaped steel foundation pit support structures, such as... Figure 1-6 As shown, this embodiment of the H-beam body 100, which is spliced ​​together by connecting steel plates 101, includes a first mounting base 1, a second mounting base 2, a bending monitoring component 3, and a pair of symmetrically arranged adaptive reinforcement components 4. The first mounting base 1 and the second mounting base 2 are respectively disposed on both sides of the connecting steel plate 101. The two ends of the bending monitoring component 3 are respectively disposed on the first mounting base 1 and the second mounting base 2, and are used to monitor the bending deformation at the joint of the H-beam body 100. The adaptive reinforcement components 4 are connected to the sides of the first mounting base 1 and the second mounting base 2, and adjust the compensation force to counteract the deformation in response to the monitoring signal of the bending monitoring component 3.

[0031] The bending monitoring assembly 3 includes an angle sensor 31, a measuring rod 32, a first mounting base 33, a second mounting base 34, and a sleeve 35. The angle sensor 31 is fixed on the first mounting base 33, and the sleeve 35 is fixed on the second mounting base 34. One end of the measuring rod 32 is fixed to the monitoring end of the angle sensor 31, and the other end is inserted into the sleeve 35 and slides along the axial direction. The first mounting base 33 and the second mounting base 34 are respectively disposed on the top of the first mounting base 1 and the second mounting base 2.

[0032] The adaptive hardening component 4 includes a servo motor 41, a reducer 42, a winding drum 43, a first fixed pulley 44, a wire rope 45, and a second fixed pulley 46. The servo motor 41 is fixedly mounted on the reinforced base 22 of the second mounting base 2, and the reducer 42 drives the winding drum 43. The wire rope 45 is wound sequentially around the first fixed pulley 44 and the second fixed pulley 46, and both ends are fixed to the winding drum 43. The grooves of the first fixed pulley 44 and the second fixed pulley 46 are multi-strand spiral grooves to accommodate the multi-directional deflection of the wire rope 45. (See attached diagram) Figure 2 As shown, the effective number of rope segments n = 4.

[0033] Both the first mounting base 1 and the second mounting base 2 include a connecting U-shaped plate 21, a pair of symmetrically arranged reinforcing bases 22, and a first mounting ear 23 for mounting the first fixed pulley 44. The connecting U-shaped plate 21 is bolted to the H-beam body 100. The two reinforcing bases 22 are respectively arranged on both sides of the connecting U-shaped plate 21. The first mounting ear 23 is integrally formed with the reinforcing base 22. The second mounting base 2 also includes a second mounting ear 24 for mounting the winding drum 43. The second mounting ear 24 is integrally formed with the reinforcing base 22.

[0034] The adaptive hardening component 4 also includes a controller. The servo motor 41 is electrically connected to the controller. The controller adjusts the rotation angle of the output end of the servo motor 41 according to the signal from the angle sensor 31.

[0035] The first mounting base 1 and the second mounting base 2 are both welded from Q345B steel plates. The inner wall of the connecting U-shaped plate 21 is provided with anti-slip serrations and is connected to the H-beam body 100 by at least 8 sets of M24 high-strength bolts (preload force 180kN). The reinforcing base 22 is made of square steel, and the first mounting ear 23 and the second mounting ear 24 are integrally formed with the reinforcing base 22.

[0036] The angle sensor 31 is a 17-bit photoelectric encoder (resolution 0.0027°), and the measuring rod 32 is a φ12mm 304 stainless steel rod. The gap between the measuring rod 32 and the inner wall of the sleeve 35 is 0.2mm, and the surface is coated with a molybdenum disulfide lubricating layer. When bending occurs at the joint, the angle sensor 31 generates a deflection angle θ.

[0037] The servo motor 41 is a 750W AC servo motor (rated torque 24 N·m), which drives the φ200mm take-up drum 43 through a 1:50 reducer 42. Calculations show that the theoretical maximum output pulling force...

[0038]

[0039] The steel wire rope 45 has a diameter of 8mm, a breaking tensile strength ≥48kN, a safety factor of 4, and a high cost-performance ratio, making it suitable for most foundation pit projects. When θ is greater than the trigger threshold, a servo motor 41 on one side is started to continuously tighten the steel wire rope 45, and the deflection angle θ is fed back to the closed-loop control system in real time until θ is less than the protection threshold.

[0040] This embodiment also provides an adaptive reinforcement method for H-shaped steel foundation pit support structures, including the following steps:

[0041] Step S1: Monitor the bending direction and deformation at the joint of the H-beam body 100 in real time using the bending monitoring component 3;

[0042] Step S2: When the deformation exceeds the trigger threshold according to the monitoring data, the controller sends a compensation command to the servo motor 41 of the adaptive reinforcement component 4 on one side, driving the wire rope 45 to tighten and apply a compensation force to the two H-beam bodies 100.

[0043] Step S3: Repeat steps S1-S2 until the deformation detected by the bending monitoring component 3 is less than the protection threshold, so as to achieve internal force balance at the joint.

[0044] In step S2:

[0045] The magnitude of the wire rope compensation displacement is proportional to the deflection angle, and the compensation forces of the two adaptive reinforcement components 4 are symmetrically distributed on both sides of the neutral axis of the H-beam body 100.

[0046] Example 2

[0047] In foundation pit support engineering, the bending deformation of H-beam joints is affected by various factors (such as earth pressure, groundwater buoyancy, construction disturbance, etc.). The values ​​of the trigger threshold and protection threshold need to balance response sensitivity and system stability. Based on Example 1, the trigger threshold is set to 0.115° and the protection threshold is set to 0.05°. The remaining technical features are the same as in Example 1.

[0048] According to the research on deformation and control technology of deep foundation pit construction in soft soil areas and the method of stiffness adjustment of support system in deep foundation pit construction, the deformation control value of foundation pit in soft soil areas is generally 0.2%–0.3% of the foundation pit depth. Taking a foundation pit with a depth h of 10m as an example, the allowable horizontal displacement Δ is 20–30mm.

[0049] The curvature θ (in radians) at the H-beam joint is determined by the ratio of the horizontal displacement Δ to the pit depth h, and satisfies the following under small deformation conditions:

[0050]

[0051] Then convert the radians to angles:

[0052]

[0053] Therefore, the bending angle at the H-beam joint is approximately 0.114°–0.172°. The trigger threshold of 0.115° is at the lower limit of this range, ensuring that reinforcement is initiated before deformation exceeds the specification. Secondly, the angle sensor 31 has a resolution of 0.0027°, and 0.115° is equivalent to 42 times the resolution, which can avoid false triggering due to noise and ensure timely response to initial deformation, such as soil creep or local stress concentration.

[0054] By setting a protection threshold of 0.05°, the residual deformation can be compressed to a safe margin range through closed-loop control. An excessively large protection threshold will cause the servo motor 41 to start and stop frequently. If the protection threshold is set too small, the system may misjudge due to sensor noise or brief vibration, triggering unnecessary compensation actions.

Claims

1. An adaptive reinforcement device for an H-beam foundation pit support structure, used to connect two H-beam bodies spliced ​​together by connecting steel plates, characterized in that: It includes a first mounting base, a second mounting base, a bending monitoring component, and a pair of symmetrically arranged adaptive reinforcement components; the first mounting base and the second mounting base are respectively disposed on both sides of the connecting steel plate; the two ends of the bending monitoring component are respectively disposed on the first mounting base and the second mounting base, and are used to monitor the bending deformation at the joint of the H-beam body; the adaptive reinforcement components are connected to the sides of the first mounting base and the second mounting base, and adjust the compensation force to counteract the deformation in response to the monitoring signal of the bending monitoring component.

2. The adaptive reinforcement device for H-shaped steel foundation pit support structure according to claim 1, characterized in that, The bending monitoring assembly includes an angle sensor, a measuring rod, a first mounting base, a second mounting base, and a sleeve; the angle sensor is mounted on the first mounting base, the sleeve is mounted on the second mounting base, one end of the measuring rod is fixed to the monitoring end of the angle sensor, and the other end is inserted into the sleeve and slidably engaged along the axial direction; the first mounting base and the second mounting base are respectively mounted on the top of the first mounting base and the second mounting base.

3. The adaptive reinforcement device for H-shaped steel foundation pit support structure according to claim 1, characterized in that, The adaptive reinforcement component includes a servo motor, a reducer, a winding drum, a first fixed pulley, a wire rope, and a second fixed pulley. The servo motor is vertically mounted on the second mounting base, and the reducer is located at the output end of the servo motor, driving the winding drum. The wire rope is wound sequentially around the first and second fixed pulleys, with both ends fixed to the winding drum. The grooves of the first and second fixed pulleys are multi-strand spiral grooves to accommodate multi-directional deflection of the wire rope.

4. The adaptive reinforcement device for H-shaped steel foundation pit support structure according to claim 3, characterized in that, The two ends of the wire rope are symmetrically arranged with respect to the center line of the winding drum to balance the force.

5. The adaptive reinforcement device for H-shaped steel foundation pit support structure according to claim 1, characterized in that, Both the first mounting base and the second mounting base include a connecting U-shaped plate, a pair of symmetrically arranged reinforcing bases, and a first mounting ear for mounting the first fixed pulley. The connecting U-shaped plate is bolted to the H-beam body. The two reinforcing bases are respectively arranged on both sides of the connecting U-shaped plate. The first mounting ear is arranged on the reinforcing base. The second mounting base also includes a second mounting ear for mounting the winding drum, which is arranged on the reinforcing base.

6. The adaptive reinforcement device for H-shaped steel foundation pit support structure according to claim 3, characterized in that, The adaptive hardening component also includes a controller, and the servo motor is electrically connected to the controller. The controller adjusts the rotation angle of the servo motor output terminal according to the signal from the angle sensor.

7. A method using any one of claims 1 to 6, characterized in that, Specifically, the following steps are included: Step S1: Monitor the bending direction and deformation at the joint of the H-beam body in real time using the bending monitoring component; Step S2: When the deformation exceeds the trigger threshold based on the monitoring data, the controller sends a compensation command to the servo motor of the adaptive reinforcement component on one side, driving the wire rope to tighten and apply a compensation force to the two H-beam bodies. Step S3: Repeat steps S1-S2 until the deformation detected by the bending monitoring component is less than the protection threshold, thus achieving internal force balance at the joint.

8. The adaptive reinforcement method for an H-shaped steel foundation pit support structure according to claim 7, characterized in that, In step S2: The magnitude of the wire rope compensation displacement is proportional to the deflection angle, and the compensation forces of the two adaptive reinforcement components are symmetrically distributed on both sides of the neutral axis of the H-beam body.

9. The adaptive reinforcement method for an H-shaped steel foundation pit support structure according to claim 8, characterized in that, In step S2: Simultaneously, a command with the opposite direction but the same magnitude as the compensation command is sent to the servo motor of another adaptive reinforcement component, causing the steel wire rope of the adaptive reinforcement component to loosen by the corresponding length.

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