Deep foundation pit side wall displacement online detection method

Abstract

The invention relates to the technical field of deep foundation pit detection, and discloses a deep foundation pit side wall displacement online detection method, which comprises a control host, an inclination sensor, a master-slave wireless communication device, a motor driving module, a communication module, a software system and the like. The method specifically comprises the following steps that 1, after a host activates a sensor, the host is integrally in a proofreading state within three to five seconds, and after proofreading is completed, proofreading is completed; the inclinometer based on the tilt angle sensor is designed, and system errors caused by the fact that the gravity direction and the tension direction of a traditional inclinometer are not in the same straight line are avoided; automatic measurement, processing, display and early warning of foundation pit deformation data are achieved; the precision of gradient measurement is improved, and errors are reduced to the maximum extent; a reasonable foundation pit deformation data processing algorithm is designed, and the actual foundation pit deformation condition and change trend contained in original data are mined to the maximum extent.

Description

Technical Field

[0001] The present application relates to the technical field of deep foundation pit detection, and in particular to an online detection method for the displacement of a deep foundation pit side wall. Background Art

[0002] In recent years, with the acceleration of urbanization in my country, the scale of urban infrastructure and commercial real estate development has expanded rapidly. At the same time, with the continuous advancement of industrialization and modernization, more and more people have gathered in large cities, resulting in an increasing demand for urban living, working and entertainment space, and urban congestion has become more and more serious. Therefore, in large and super-large cities with a serious shortage of land supply, expanding underground and aerial space has become an inevitable and perhaps the only option.

[0003] In this context, the surrounding environment during foundation pit construction is becoming more and more complex, and underground projects themselves are developing in the direction of ultra-deep and large areas. As a result, safety issues in the foundation pit construction process are becoming increasingly prominent; it is necessary not only to ensure the stability and safety of the foundation pit itself, but also to consider the impact of its own deformation on the safety of surrounding buildings. From the analysis of a large number of foundation pit engineering accidents, it can be concluded that any foundation pit engineering accident is directly related to poor, inaccurate, and untimely monitoring. Therefore, it is of great practical significance to conduct a comprehensive inspection of the entire foundation pit in real time and measure its safety with reasonable parameter indicators.

[0004] During the excavation and continuous digging of deep foundation pits and underground projects, the retaining structures and stress fields will gradually change to varying degrees. Therefore, the soil inside and outside the foundation pit will also deform due to the change of stress. If it is not discovered in time, serious safety hazards will appear over time, which will not only cause economic and property losses but also threaten people's personal safety.

[0005] Existing detection technologies are divided into photographic inclinometer technology and electronic inclinometer technology. However, photographic inclinometer technology uses the magnetic principle, which is more easily affected by the external environment, while electronic inclinometer technology uses a wired connection, so the depth of the foundation pit will cause limitations to it. As a result, the overall operation is relatively limited and is not conducive to promotion and use.

[0006] Therefore, those skilled in the art provide an online detection method for the displacement of the side wall of a deep foundation pit to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0007] In order to solve the problem that the photographic inclinometer technology proposed in the above background technology adopts the magnetic principle and is easily disturbed by the external environment, and the electronic inclinometer technology adopts a wired connection method, so the depth of the foundation pit will cause limitations to it, resulting in greater limitations in overall operation and not conducive to promotion and use, the present application provides an online detection method for the side wall displacement of a deep foundation pit.

[0008] The present application provides a method for online detection of the sidewall displacement of a deep foundation pit, which adopts the following technical solution: the whole system is composed of a control host, a tilt sensor, a master-slave wireless communication device, a motor drive module, a communication module and a software system, and the method specifically includes the following steps:

[0009] Step 1: After the host activates the sensor, the host is in the calibration state within three to five seconds. After the calibration is completed, the indicator lights of the entire device are in the green state;

[0010] Step 2: Check the firmness of the connection between the control host and the tilt sensor, and check the maximum length of the wire rope used to connect the two to ensure that it can meet sufficient usage requirements in subsequent use;

[0011] Step 3: Place the tilt sensor inside the deep foundation pit until it touches the bottom, and check whether the connected wire rope is in a taut state;

[0012] Step 4: Control the host to pull the tilt sensor upwards at intervals of 50 cm;

[0013] Step 5: The tilt sensor is lifted to the last measuring point, and after the detection is completed, the limit switch of the control host is triggered;

[0014] Step 6: Recover the tilt sensor and charge it using the control host;

[0015] Step 7: The control host sends the received measurement data to the operator network node;

[0016] Step 8: Data analysis.

[0017] Preferably, after the control host activates the sensor, the host side and the sensor side will perform data synchronization correction with each other, so as to ensure the stability of data transmission during subsequent detection processes and avoid data transmission interruption or data loss. If the indicator light is in the green state, it means that the correction between the components is successful, otherwise it means that the correction has failed.

[0018] Preferably, after the tilt sensor touches the bottom, the data is immediately transmitted back to the control host receiver, at which time the servo motor immediately stops paying out the wire, and after ensuring that the wire rope is in a taut state, it can avoid paying out the wire rope too long, which would affect the accuracy of the detection data.

[0019] Preferably, the control host controls the servo motor to rotate in the opposite direction, at which time the tilt sensor is lifted upward at intervals of fifty centimeters. When lifted in an intermittent state, the tilt sensor measures the tilt angle of the current point at each stationary point, thereby achieving a technical means for detecting the entire foundation pit.

[0020] Preferably, after the detection operation of the tilt sensor is completed, the limit switch of the host is controlled to trigger the limit of the tilt sensor. During the limit process, the current group of measurement data begins to be transmitted to the host, thereby ensuring the stability of data transmission and avoiding interference from external factors.

[0021] Preferably, after the tilt sensor is working, when charging, the host excites the coupling coil at the host end at a certain frequency to transmit energy to the sensor end. The sensor obtains +5V DC power through high-frequency rectification and filtering. Considering factors such as comprehensive efficiency and charging power, the charging frequency is selected to be 33KHZ.

[0022] Preferably, when the control host sends the received detection data, it sends it through a narrowband local area network, and the node sends the data to a remote server through the operator network.

[0023] Preferably, during the data analysis, the dedicated control software running on the server receives the measurement data from the site and stores it in the database; at the same time, the website background program hanging on this server will interpolate the data, update the foundation pit deformation curve and data for client access, and independently judge the safety of the corresponding foundation pit and decide whether to issue an alarm or adjust the measurement cycle of the on-site measurement unit.

[0024] In summary, this application includes the following beneficial technical effects:

[0025] 1. Design an inclinometer based on a tilt sensor and avoid the system error caused by the fact that the direction of gravity and the direction of tension are not in the same straight line in traditional inclinometers.

[0026] 2. Solve the automatic measurement, processing, display and early warning of foundation pit deformation data.

[0027] 3. Solve the problem of inclination measurement accuracy and minimize the error.

[0028] 4. Design a reasonable foundation pit deformation data processing algorithm to maximize the mining of the actual foundation pit deformation and change trends contained in the original data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main functional components of an online detection method for the side wall displacement of a deep foundation pit in an embodiment of the present application;

[0030] Figure 2 It is a schematic diagram of foundation pit simulation detection of a deep foundation pit side wall displacement online detection method in an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of a manual and automatic measurement comparison structure of an online detection method for the side wall displacement of a deep foundation pit in an embodiment of the present application;

[0032] Figure 4 This is a main program flow chart of an online detection method for the side wall displacement of a deep foundation pit in an embodiment of the present application;

[0033] Figure 5 It is a communication port program flow chart of an online detection method for the side wall displacement of a deep foundation pit in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the attached Figure 1-5 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only 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.

[0035] The present application embodiment discloses an online detection method for the displacement of the side wall of a deep foundation pit, referring to Figure 1-5 The whole system is composed of a control host, a tilt sensor, a master-slave wireless communication device, a motor drive module, a communication module and a software system. The method specifically includes the following steps:

[0036] Step 1: After the host activates the sensor, the host is in the calibration state within three to five seconds. After the calibration is completed, the indicator lights of the entire device are in the green state;

[0037] Step 2: Check the firmness of the connection between the control host and the tilt sensor, and check the maximum length of the wire rope used to connect the two to ensure that it can meet sufficient usage requirements in subsequent use;

[0038] Step 3: Place the tilt sensor inside the deep foundation pit until it touches the bottom, and check whether the connected wire rope is in a taut state;

[0039] Step 4: Control the host to pull the tilt sensor upwards at intervals of 50 cm;

[0040] Step 5: The tilt sensor is lifted to the last measuring point, and after the detection is completed, the limit switch of the control host is triggered;

[0041] Step 6: Recover the tilt sensor and charge it using the control host;

[0042] Step 7: The control host sends the received measurement data to the operator network node;

[0043] Step 8: Data analysis.

[0044] In the present application, after the control host activates the sensor, the host and the sensor will perform data synchronization correction with each other, so as to ensure the stability of data transmission during subsequent detection and avoid data transmission interruption or data loss. If the indicator light is in the green state, it means that the correction between the components is successful, otherwise it means that the correction has failed.

[0045] In the present application, after the tilt sensor touches the bottom, the data is immediately transmitted back to the control host receiver. At this time, the servo motor immediately stops paying out the wire. After ensuring that the wire rope is in a taut state, it can avoid paying out the wire rope too long, which will affect the accuracy of the detection data.

[0046] In the present application, the control host controls the servo motor to rotate in the opposite direction. At this time, the tilt sensor is lifted upward at intervals of fifty centimeters. When lifted in an intermittent state, the tilt sensor measures the current point tilt angle at each static point, thereby achieving technical means for detecting the entire foundation pit.

[0047] In the present application, after the detection operation of the tilt sensor is completed, the limit switch of the host is controlled to trigger the limit of the tilt sensor. During the limit process, the current group of measurement data begins to be transmitted to the host, thereby ensuring the stability of data transmission and avoiding interference from external factors.

[0048] In this application, after the tilt sensor is working, when charging, the host excites the coupling coil on the host end at a certain frequency to transmit energy to the sensor end. The sensor obtains +5V DC power through high-frequency rectification and filtering. Considering factors such as comprehensive efficiency and charging power, the charging frequency is selected to be 33KHZ.

[0049] In the present application, when the control host sends the received detection data, it sends it through a narrowband local area network, and the node sends the data to a remote server through the operator network.

[0050] In the present application, during the data analysis, the dedicated control software running on the server receives the measurement data from the site and stores it in the database; at the same time, the website background program hanging on this server will interpolate the data, update the foundation pit deformation curve and data for client access, and independently judge the safety of the corresponding foundation pit and decide whether to issue an alarm or adjust the measurement cycle of the on-site measurement unit.

[0051] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0052] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0053] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved, and other structures can refer to the usual design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

Claims

1. A method for online detection of sidewall displacement of a deep foundation pit, characterized in that: The whole system is composed of a control host, a tilt sensor, a master-slave wireless communication device, a motor drive module, a communication module and a software system. The method specifically includes the following steps: Step 1: After the host activates the sensor, the host is in the calibration state within three to five seconds. After the calibration is completed, the indicator lights of the entire device are in the green state; Step 2: Check the firmness of the connection between the control host and the tilt sensor, and check the maximum length of the wire rope used to connect the two to ensure that it can meet sufficient usage requirements in subsequent use; Step 3: Place the tilt sensor inside the deep foundation pit until it touches the bottom, and check whether the connected wire rope is in a taut state; Step 4: Control the host to pull the tilt sensor upwards at intervals of 50 cm; Step 5: The tilt sensor is lifted to the last measuring point, and after the detection is completed, the limit switch of the control host is triggered; Step 6: Recover the tilt sensor and charge it using the control host; Step 7: The control host sends the received measurement data to the operator network node; Step 8: Data analysis.

2. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: After the control host activates the sensor, the host and the sensor will perform data synchronization correction with each other, so as to ensure the stability of data transmission in the subsequent detection process and avoid data transmission interruption or data loss. If the indicator light is in the green state, it means that the correction between the components is successful, otherwise it means that the correction has failed.

3. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: After the tilt sensor touches the bottom, the data is immediately transmitted back to the control host receiver. At this time, the servo motor immediately stops paying out the wire. After ensuring that the wire rope is in a taut state, it can avoid paying out the wire rope too long, which will affect the accuracy of the detection data.

4. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: The control host controls the servo motor to rotate in the opposite direction. At this time, the tilt sensor is lifted upward at intervals of fifty centimeters. When lifted in an intermittent state, the tilt sensor measures the tilt angle of the current point at each static point, thereby achieving technical means for detecting the entire foundation pit.

5. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: After the detection operation of the tilt sensor is completed, the limit switch of the host is controlled to trigger the limit of the tilt sensor. During the limit process, the group of measurement data begins to be transmitted to the host, thereby ensuring the stability of data transmission and avoiding interference from external factors.

6. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: After the tilt sensor is working, when charging, the host excites the coupling coil at the host end at a certain frequency to transmit energy to the sensor end. The sensor obtains +5V DC through high-frequency rectification and filtering. Considering factors such as comprehensive efficiency and charging power, the charging frequency is selected to be 33KHZ.

7. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: When the control host sends the received detection data, it sends it through a narrowband local area network, and the node sends the data to a remote server through the operator network.

8. The method for online detection of sidewall displacement of a deep foundation pit according to claim 1, characterized in that: During the data analysis, the dedicated control software running on the server receives the measurement data from the site and stores it in the database; at the same time, the website background program hanging on this server will interpolate the data, update the foundation pit deformation curve and data for client access, and independently judge the safety of the corresponding foundation pit and decide whether to issue an alarm or adjust the measurement cycle of the on-site measurement unit.

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