A method and intelligent monitoring device for monitoring horizontal displacement of underground continuous wall

Abstract

A method for monitoring the horizontal displacement of underground continuous walls, wherein a measuring and controlling line for monitoring the horizontal displacement between the two underground continuous walls is horizontally arranged between the two underground continuous walls, the head end of the measuring and controlling line is fixed on one of the underground continuous walls, the tail end of the measuring and controlling line is wound on the wire groove of the rotating shaft in the monitoring instrument, the monitoring instrument is fixed on the steel bar of the other underground continuous wall by welding, the cumulative number of revolutions of the rotating shaft is obtained at every predetermined time interval, and the horizontal displacement is converted according to the obtained cumulative number of revolutions. The present invention also provides an intelligent monitoring device for implementing the method for monitoring the horizontal displacement of underground continuous walls. The present invention can realize intelligent data collection, has low cost and simple operation, and can more accurately reflect the measurement results by amplifying the number of revolutions of the rotating shaft through a number of revolution amplification device.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering, and in particular to a method and an intelligent monitoring device for monitoring horizontal displacement of an underground continuous wall. Background Art

[0002] With the development of urbanization, the development of underground space has received more and more attention. It is inevitable to build deep and large foundation pits in the city close to buildings or subway tunnels. Therefore, how to ensure the safe excavation of deep and large foundation pits in soft soil while reducing the impact on the surrounding environment has become a difficult problem. After the first successful application of the steel support servo system in the Shanghai Wheelock Square project, the servo system has been used more and more widely, but the stress-controlled servo axial force control system is still the main one used. Its disadvantage is that it cannot accurately calculate the control design value of the servo axial force. If the servo axial force design value does not meet the requirements, the axial force setting value can only be reset after a large deformation occurs. In order to make better use of the steel support servo system, many scholars and engineers have proposed a steel support servo system controlled by displacement. In this way, there is an urgent need for an intelligent monitoring device for the horizontal displacement of underground continuous walls with high acquisition frequency, high accuracy and relatively low cost. Summary of the invention

[0003] In order to overcome the above problems, the present invention provides an intelligent monitoring device and method for horizontal displacement of an underground continuous wall.

[0004] A first aspect of the present invention provides a method for monitoring horizontal displacement of an underground continuous wall, comprising the following steps:

[0005] Step 1: a measuring and controlling line for monitoring the horizontal displacement between the two underground continuous walls is horizontally set between the two underground continuous walls, the head end of the measuring and controlling line is fixed on one of the underground continuous walls, the tail end of the measuring and controlling line is wound on the wire groove of the rotating shaft in the monitoring instrument, the monitoring instrument is fixed on the steel bar of the other underground continuous wall by welding, the accumulated number of revolutions of the rotating shaft is obtained at every predetermined time interval, and the horizontal displacement is converted according to the accumulated number of revolutions obtained;

[0006] Step 2: Assume that the time interval between two adjacent measurements is A; n is the nth measurement, and its initial value is 0; t n is the local time at the time of the nth measurement, and its initial value is t0=0; T is the local time; M is the real-time torque value of the motor, and m is the set torque control value;

[0007] Step 3: When T = t n +A or t0=0, execute step 4;

[0008] Step 4, turn on the CNC switch, start the motor, and determine whether the real-time torque value M of the motor exceeds the set torque control value m. If it exceeds the set torque control value m, execute step 5;

[0009] Step 5, turn off the CNC switch, shut down the motor and lock the shaft at the same time. If the number of revolutions of the revolution collection device does not increase within 5 seconds, execute step 6;

[0010] Step 6, let n = n + 1, record the local time at this time as t n , the cumulative number of revolutions is N n , release the locked state of the shaft and repeat step 3;

[0011] Step 7, calculating the cumulative total horizontal displacement C1 between the two underground continuous walls and the increase C2 of the cumulative horizontal displacement between the two underground continuous walls compared with the previous one;

[0012]

[0013]

[0014] Where D is the shaft diameter minus 2 times the wire groove depth; N1 is the cumulative number of revolutions collected by the revolution collection device for the first time; N n is the cumulative number of revolutions collected by the revolution collection device for the nth time; a is the magnification factor of the revolution amplification device.

[0015] A second aspect of the present invention provides an intelligent monitoring device for implementing a method for monitoring the horizontal displacement of an underground continuous wall, comprising a monitoring instrument and a measurement and control line arranged between two underground continuous walls of a foundation pit, wherein the horizontal support between the two underground continuous walls is provided with a servo steel support;

[0016] A measurement and control line is provided above the servo steel support in the vertical direction, and the axis of the measurement and control line is parallel to the axis of the servo steel support; the head end of the measurement and control line is fixed on one of the underground continuous walls, and the tail end of the measurement and control line is wound around the rotating shaft of the monitoring instrument, and the monitoring instrument is fixed to the steel bar of the other underground continuous wall by welding;

[0017] The monitoring instrument comprises a box body, in which a motor is arranged, the output shaft of the motor is arranged vertically upward and fixedly connected to a rotating shaft, and the rotating shaft is supported by two bearings arranged in the box body respectively; a wire groove for winding a measurement and control line is arranged in the middle of the rotating shaft, and the tail end of the measurement and control line is fixed in the wire groove; a revolution amplifying device is arranged at the upper end of the rotating shaft, and a revolution collecting device is arranged at the output end of the revolution amplifying device; the revolution collecting device is electrically connected to the signal input end of the main control board, and the revolution collecting device sends the accumulated revolution information to the main control board; the main control board is connected to the host computer for communication, and the host computer sends the measurement and control time interval to the main control board; the power supply end of the main control board is connected to the power supply, one end of the numerical control switch is connected to the power supply, the other end of the numerical control switch is connected to the power supply end of the motor, and the control end of the numerical control switch is connected to the signal output end of the main control board;

[0018] A torque sensor and a brake device are also provided on the output shaft of the motor, and the torque sensor and the brake device are electrically connected to the main control board respectively; when the torque value of the motor exceeds the set torque value, the main control board sends a control signal to the CNC switch and the brake device to cut off the power supply of the motor and start the brake device for braking at the same time; after the main control board receives the accumulated number of revolutions information, the main control board sends a control signal to the brake device to close the brake device.

[0019] Furthermore, the speed amplifying device includes a primary large gear, a primary small gear, a final large gear and a final small gear. The primary large gear is installed at the upper end of the rotating shaft, the primary large gear is meshed with the primary small gear, and the radius of the primary large gear is larger than the radius of the primary small gear; the primary small gear is coaxially installed with the final large gear, and the radius of the final large gear is larger than the radius of the primary small gear; the final large gear is meshed with the final small gear, and the radius of the final large gear is larger than the radius of the final small gear; the final small gear is installed on the transmission shaft, and the transmission shaft serves as the output end of the speed amplifier.

[0020] Furthermore, the width of the wire groove is equal to the diameter of the measurement and control line.

[0021] Furthermore, the measurement and control line is made of steel wire or fishing line.

[0022] The beneficial effects of the present invention are:

[0023] 1. This device can independently set the measurement and control time interval.

[0024] 2. This device can realize intelligent data collection.

[0025] 3. This device amplifies the number of revolutions through a revolution amplifier, which can reflect the measurement results more accurately.

[0026] 4. This device is lower in cost, simpler to operate and easier to put into use than general monitoring devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a logical relationship diagram of the present invention.

[0028] Figure 2 It is a cross-sectional view of the hypothetical on-site arrangement of the present invention.

[0029] Figure 3 It is a diagram of the equipment layout in the box of the present invention.

[0030] Figure 4 This is a schematic diagram of the internal structure of the rev amplifier.

[0031] In the figure: 1- monitoring instrument, 2- measurement and control line, 3- main control board, 4- CNC switch, 5- motor, 6- shaft, 7- speed amplifying device, 8- power supply, 9- speed collecting device, 10- primary large gear, 11- primary small gear, 12- final large gear, 13- final small gear, 14- main engine, 15- servo steel support, 16- servo CNC pump station. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Referring to the accompanying drawings, a method for monitoring the horizontal displacement of an underground continuous wall comprises the following steps: A first aspect of the present invention provides a method for monitoring the horizontal displacement of an underground continuous wall, comprising the following steps:

[0036] Step 1: a measuring and controlling line for monitoring the horizontal displacement between the two underground continuous walls is horizontally set between the two underground continuous walls, the head end of the measuring and controlling line is fixed on one of the underground continuous walls, the tail end of the measuring and controlling line is wound on the wire groove of the rotating shaft in the monitoring instrument, the monitoring instrument is fixed on the steel bar of the other underground continuous wall by welding, the accumulated number of revolutions of the rotating shaft is obtained at every predetermined time interval, and the horizontal displacement is converted according to the accumulated number of revolutions obtained;

[0037] Step 2: Assume that the time interval between two adjacent measurements is A; n is the nth measurement, and its initial value is 0; t n is the local time at the time of the nth measurement, and its initial value is t0=0; T is the local time; M is the real-time torque value of the motor, and m is the set torque control value;

[0038] Step 3: When T = t n +A or t0=0, execute step 4;

[0039] Step 4, turn on the CNC switch, start the motor, and determine whether the real-time torque value M of the motor exceeds the set torque control value m. If it exceeds the set torque control value m, execute step 5;

[0040] Step 5, turn off the CNC switch, shut down the motor and lock the shaft at the same time. If the number of revolutions of the revolution collection device does not increase within 5 seconds, execute step 6;

[0041] Step 6, let n = n + 1, record the local time at this time as t n , the cumulative number of revolutions is N n ,, release the locked state of the shaft and repeat step 3;

[0042] Step 7, calculating the cumulative total horizontal displacement C1 between the two underground continuous walls and the increase C2 of the cumulative horizontal displacement between the two underground continuous walls compared with the previous one;

[0043]

[0044]

[0045] Where D is the shaft diameter minus 2 times the wire groove depth; N1 is the cumulative number of revolutions collected by the revolution collection device for the first time; N n is the cumulative number of revolutions collected by the revolution collection device for the nth time; a is the magnification factor of the revolution amplification device.

[0046] An intelligent monitoring device for implementing a method for monitoring the horizontal displacement of an underground continuous wall, comprising a monitoring instrument 1 and a measurement and control line 2 arranged between two underground continuous walls of a foundation pit, a servo steel support 15 being horizontally supported between the two underground continuous walls, and the servo steel support 15 being electrically connected to a servo numerical control pump station 16;

[0047] The servo steel support 15 is provided with a measuring and controlling line 2 above in the vertical direction, and the axis of the measuring and controlling line 2 is parallel to the axis of the servo steel support 15; the head end of the measuring and controlling line 2 is fixed on one of the underground continuous walls, and the tail end of the measuring and controlling line 2 is wound on the rotating shaft 6 of the monitoring instrument 1, and the monitoring instrument 1 is fixed on the steel bars of the other underground continuous wall by welding;

[0048] The monitoring instrument 1 comprises a box body, in which a motor 5 is arranged, the output shaft of the motor 5 is arranged vertically upward and fixedly connected to a rotating shaft 6, and the rotating shaft 6 is supported by two bearings arranged in the box body respectively; a wire groove for winding a measuring and controlling wire 2 is arranged in the middle of the rotating shaft 6, the groove width of the wire groove is equal to the diameter of the measuring and controlling wire 2, the tail end of the measuring and controlling wire 2 is fixed in the wire groove, and the measuring and controlling wire 2 can be made of steel wire or fishing line; a revolution amplifying device 7 is arranged at the upper end of the rotating shaft 6, and a revolution collecting device 9 is arranged at the output end of the revolution amplifying device 7;

[0049] Specifically, the speed amplifier 7 includes a primary large gear 10, a primary small gear 11, a final large gear 12 and a final small gear 13. The primary large gear 10 is installed at the upper end of the rotating shaft and rotates with the rotating shaft 6. The primary large gear 10 is meshed with the primary small gear 11, and the radius of the primary large gear 10 is greater than the radius of the primary small gear 11; the primary small gear 11 is coaxially installed with the final large gear 12, and the radius of the final large gear 12 is greater than the radius of the primary small gear 11; the final large gear 12 is meshed with the final small gear 13, and the radius of the final large gear 12 is greater than the radius of the final small gear 13; the final small gear 13 is installed on the transmission shaft, and the transmission shaft serves as the output end of the speed amplifier.

[0050] The revolution acquisition device 9 is electrically connected to the signal input terminal of the main control board 3, and the revolution acquisition device 9 sends the accumulated revolution information to the main control board 3; the main control board 3 is connected to the host 14 for communication, and the host 14 sends the measurement and control time interval to the main control board 3; the power supply terminal of the main control board 3 is connected to the power supply, one end of the numerical control switch 4 is connected to the power supply, the other end of the numerical control switch 4 is connected to the power supply terminal of the motor 5, and the control end of the numerical control switch 4 is connected to the signal output terminal of the main control board 3;

[0051] A torque sensor and a brake device are also provided on the output shaft of the motor 5, and the torque sensor and the brake device are electrically connected to the main control board 3 respectively; when the torque value of the motor 5 exceeds the set torque value, the main control board 3 sends a control signal to the CNC switch 4 and the brake device to cut off the power supply of the motor 5 and start the brake device for braking at the same time; after the main control board 3 receives the accumulated number of revolutions information, the main control board 3 sends a control signal to the brake device to close the brake device.

[0052] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A method for monitoring the horizontal displacement of underground continuous walls, wherein the intelligent monitoring device used comprises a monitoring instrument and a measurement and control line arranged between two underground continuous walls of a foundation pit, and the horizontal support between the two underground continuous walls is provided with a servo steel support; A measurement and control line is provided above the servo steel support in the vertical direction, and the axis of the measurement and control line is parallel to the axis of the servo steel support; the head end of the measurement and control line is fixed on one of the underground continuous walls, and the tail end of the measurement and control line is wound around the rotating shaft of the monitoring instrument, and the monitoring instrument is fixed to the steel bar of the other underground continuous wall by welding; The monitoring instrument comprises a box body, in which a motor is arranged, the output shaft of the motor is arranged vertically upward and fixedly connected to a rotating shaft, and the rotating shaft is supported by two bearings arranged in the box body respectively; a wire groove for winding a measurement and control line is arranged in the middle of the rotating shaft, and the tail end of the measurement and control line is fixed in the wire groove; a revolution amplifying device is arranged at the upper end of the rotating shaft, and a revolution collecting device is arranged at the output end of the revolution amplifying device; the revolution collecting device is electrically connected to the signal input end of the main control board, and the revolution collecting device sends the accumulated revolution information to the main control board; the main control board is connected to the host computer for communication, and the host computer sends the measurement and control time interval to the main control board; the power supply end of the main control board is connected to the power supply, one end of the numerical control switch is connected to the power supply, the other end of the numerical control switch is connected to the power supply end of the motor, and the control end of the numerical control switch is connected to the signal output end of the main control board; The output shaft of the motor is also provided with a torque sensor and a brake device, which are electrically connected to the main control board respectively; when the torque value of the motor exceeds the set torque value, the main control board sends a control signal to the CNC switch and the brake device to cut off the power supply of the motor and start the brake device for braking; after the main control board receives the accumulated number of revolutions information, the main control board sends a control signal to the brake device to close the brake device; It is characterized in that The underground continuous wall horizontal displacement monitoring method comprises the following steps: Step 1: a measuring and controlling line for monitoring the horizontal displacement between the two underground continuous walls is horizontally set between the two underground continuous walls, the head end of the measuring and controlling line is fixed on one of the underground continuous walls, the tail end of the measuring and controlling line is wound on the wire groove of the rotating shaft in the monitoring instrument, the monitoring instrument is fixed on the steel bar of the other underground continuous wall by welding, the accumulated number of revolutions of the rotating shaft is obtained at every predetermined time interval, and the horizontal displacement is converted according to the accumulated number of revolutions obtained; Step 2: Assume that the time interval between two adjacent measurements is A; n is the nth measurement, and its initial value is 0; t n is the local time at the time of the nth measurement, and its initial value is t0=0; T is the local time; M is the real-time torque value of the motor, and m is the set torque control value; Step 3: When T = t n +A or t0=0, execute step 4; Step 4, turn on the CNC switch, start the motor, and determine whether the real-time torque value M of the motor exceeds the set torque control value m. If it exceeds the set torque control value m, execute step 5; Step 5, turn off the CNC switch, shut down the motor and lock the shaft at the same time. If the number of revolutions of the revolution collection device does not increase within 5 seconds, execute step 6; Step 6, let n = n + 1, record the local time at this time as t n , the cumulative number of revolutions is N n , release the locked state of the shaft and repeat step 3; Step 7, calculating the cumulative total horizontal displacement C1 between the two underground continuous walls and the increase C2 of the cumulative horizontal displacement between the two underground continuous walls compared with the previous one; Where D is the shaft diameter minus 2 times the wire groove depth; N1 is the cumulative number of revolutions collected by the revolution collection device for the first time; N n is the cumulative number of revolutions collected by the revolution collection device for the nth time; a is the magnification factor of the revolution amplification device.

2. An intelligent monitoring device for implementing the underground continuous wall horizontal displacement monitoring method according to claim 1, characterized in that: It includes monitoring instruments and measurement and control lines arranged between two underground continuous walls of the foundation pit, and the horizontal support between the two underground continuous walls is provided with servo steel support; A measurement and control line is provided above the servo steel support in the vertical direction, and the axis of the measurement and control line is parallel to the axis of the servo steel support; the head end of the measurement and control line is fixed on one of the underground continuous walls, and the tail end of the measurement and control line is wound around the rotating shaft of the monitoring instrument, and the monitoring instrument is fixed to the steel bar of the other underground continuous wall by welding; The monitoring instrument comprises a box body, in which a motor is arranged, the output shaft of the motor is arranged vertically upward and fixedly connected to a rotating shaft, and the rotating shaft is supported by two bearings arranged in the box body respectively; a wire groove for winding a measurement and control line is arranged in the middle of the rotating shaft, and the tail end of the measurement and control line is fixed in the wire groove; a revolution amplifying device is arranged at the upper end of the rotating shaft, and a revolution collecting device is arranged at the output end of the revolution amplifying device; the revolution collecting device is electrically connected to the signal input end of the main control board, and the revolution collecting device sends the accumulated revolution information to the main control board; the main control board is connected to the host computer for communication, and the host computer sends the measurement and control time interval to the main control board; the power supply end of the main control board is connected to the power supply, one end of the numerical control switch is connected to the power supply, the other end of the numerical control switch is connected to the power supply end of the motor, and the control end of the numerical control switch is connected to the signal output end of the main control board; The output shaft of the motor is also provided with a torque sensor and a brake device, which are electrically connected to the main control board respectively; when the torque value of the motor exceeds the set torque value, the main control board sends a control signal to the CNC switch and the brake device to cut off the power supply of the motor and start the brake device for braking; after the main control board receives the accumulated number of revolutions information, the main control board sends a control signal to the brake device to close the brake device; The revolution amplifying device comprises a primary large gear, a primary small gear, a final large gear and a final small gear, wherein the primary large gear is mounted on the upper end of the rotating shaft, the primary large gear is meshed with the primary small gear, and the radius of the primary large gear is greater than the radius of the primary small gear; the primary small gear is coaxially mounted with the final large gear, and the radius of the final large gear is greater than the radius of the primary small gear; the final large gear is meshed with the final small gear, and the radius of the final large gear is greater than the radius of the final small gear; the final small gear is mounted on the transmission shaft, and the transmission shaft serves as the output end of the revolution amplifier; The groove width of the wire groove is equal to the diameter of the measurement and control line.

3. An intelligent monitoring device as claimed in claim 2, characterized in that: The measuring and controlling wire is made of steel wire or fishing line.

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