CN213148168U - Long-term stress monitoring system based on perforated diaphragm wall - Google Patents
Long-term stress monitoring system based on perforated diaphragm wall Download PDFInfo
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- CN213148168U CN213148168U CN202021895093.6U CN202021895093U CN213148168U CN 213148168 U CN213148168 U CN 213148168U CN 202021895093 U CN202021895093 U CN 202021895093U CN 213148168 U CN213148168 U CN 213148168U
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Abstract
A long-term stress monitoring system based on a perforated diaphragm wall comprises monitoring equipment for monitoring diaphragm wall strain data, a data acquisition device for acquiring the strain data, a data processing system for performing stress analysis and an alarm module for giving an alarm when the monitored diaphragm wall stress value reaches an early warning value, wherein the top surface of the diaphragm wall is provided with a plurality of holes extending along the vertical direction, the positions of the holes are enabled to avoid a diaphragm wall reinforcement cage, and the holes are uniformly distributed at equal intervals along the length of the diaphragm wall; the size of the hole is matched with that of the monitoring equipment, and the hole penetrates through the bottom surface of the diaphragm wall; the monitoring equipment is arranged in the hole and is a hollow inclusion stressometer. The utility model discloses can furthest's utilization ground even wall structure, high-efficient, practical, reliable ground even wall stress monitoring.
Description
Technical Field
The utility model relates to a stress monitoring field especially relates to a long-term stress monitoring system based on perforation formula ground is wall even.
Background
In many large-scale projects, the construction mode of using the diaphragm wall as a supporting structure is increasingly widespread. The diaphragm wall can bear large soil pressure in the construction stage and can become a permanent barrier of a foundation or become a part of an underground structure after the construction with strong anti-seepage performance is finished. The stress in the wall body of the diaphragm wall can be continuously increased due to the continuous increase of the excavation depth in the excavation process, and the wall body can be cracked when the certain degree is reached, so that the internal structure of the wall body can be seriously damaged. Not only in the construction stage, but also the existing diaphragm wall is greatly influenced if new engineering projects are constructed in the surrounding environment after the construction is finished. Long-term monitoring of diaphragm wall stress is necessary.
However, at present, there are almost no methods for monitoring the stress of the diaphragm wall for a long time, and the existing monitoring methods are mainly the traditional methods, such as a drilling core-pulling method and an acoustic wave projection method, and the subsequent monitoring after the construction is finished is troublesome, and the wall body may be damaged to a certain extent. Many people also select the embedded sensors to monitor the internal stress of the diaphragm wall, but in this way, the monitoring equipment is easy to damage and repair during construction, and the measurement is not accurate. The existing diaphragm wall structure is not suitable for stress monitoring, and the existing stress monitoring schemes are not designed by combining the diaphragm wall structure. In fact, the underground wall is very bulky and causes waste of resources if the internal space of the underground wall is not effectively utilized.
Disclosure of Invention
In order to overcome the problems, the utility model provides a long-term stress monitoring system based on perforation formula ground is wall even.
The utility model adopts the technical proposal that: the utility model provides a long-term stress monitoring system based on perforation formula ground is wall even, is including the monitoring facilities who is used for monitoring ground even wall strain data, be used for gathering strain data's data acquisition device, be used for carrying out stress analysis's data processing system and be used for carrying out the alarm module that reports to the police when the ground that monitors even wall stress value reaches early warning value, its characterized in that: the top surface of the diaphragm wall is provided with a plurality of holes extending along the vertical direction, the positions of the holes are enabled to avoid the diaphragm wall reinforcement cage, and the holes are uniformly distributed along the length of the diaphragm wall at equal intervals; the size of the hole is matched with that of the monitoring equipment, and the hole penetrates through the bottom surface of the diaphragm wall;
the monitoring equipment is a hollow inclusion stressometer, the hollow inclusion stressometers are arranged at intervals along the axial direction of the hole, and strain flowers for measuring stress are arranged on the hollow inclusion stressometers; the hollow inclusion stressometer is electrically connected with the data acquisition device through a transmission cable, and transmits the strain data to the data acquisition device; the data acquisition device is in wireless communication connection with the data processing system, stores the strain data and transmits the strain data to the data processing system; the data processing system is in wireless communication connection with the PC end;
the data processing system comprises a data receiving and storing module, a stress analysis module, a reliability analysis module and a data transmission module; the data receiving and storing module receives and stores the strain data transmitted by the data acquisition device; the stress analysis module comprises a stress calculation submodule, a quality control submodule and a stress precision evaluation submodule, the stress calculation submodule is used for calculating a stress analysis value, the quality control submodule is used for removing an abnormal value, and the stress precision evaluation submodule evaluates the stress analysis value; the stress analysis module calls the strain data in the data receiving and storing module, and calculates and evaluates the strain data corresponding to the variable data to obtain a stress analysis result; the reliability analysis module performs reliability analysis on the stress analysis result to obtain a reliability analysis result; the data transmission module sends the stress analysis result and the reliability analysis result to the PC terminal, and sends alarm information to the PC terminal when the monitored stress exceeds an early warning value;
the PC end is electrically connected with the alarm device, displays an analysis result and transmits a received alarm signal to the alarm device; the alarm device comprises an LED indicator light and an alarm for sending alarm notification to monitoring personnel.
Furthermore, the 4 strain gages are sequentially arranged from top to bottom along the axial direction of the hollow inclusion strain gage, wherein the strain gage positioned at the head is obliquely arranged towards the lower right, the strain gage positioned at the second position is arranged along the horizontal direction, the strain gage positioned at the third position is obliquely arranged towards the upper right, and the strain gage positioned at the tail position is arranged along the vertical direction; the included angle between the strain gauge positioned at the first position and the strain gauge positioned at the second position is 45 degrees, and the included angle between the strain gauge positioned at the second position and the strain gauge positioned at the third position is 45 degrees.
Further, the data acquisition device comprises a storage module and a wireless signal transmitting device, wherein the storage module is used for storing the strain data transmitted by the monitoring equipment, and the wireless signal transmitting device is used for transmitting the strain data to the data processing system.
Furthermore, the hole is positioned in the center of the thickness direction of the diaphragm wall.
The utility model has the advantages that: the ground is wall structure even to the furthest, and permanent, high-efficient, practical, reliable ground is wall stress monitoring even.
Drawings
Figure 1 is a front view of an underground wall cavity structure and monitoring equipment placement location.
Figure 2 is a side view of the structure of an underground wall cavity and the location of the monitoring device.
Fig. 3 is a top view of the structure of the groundwall opening and the location of the monitoring device.
Fig. 4 is a schematic view of the structure of the monitoring device.
Fig. 5 is a top view of the monitoring device.
FIG. 6 is a schematic view of a structure of a strain flower.
Fig. 7 is a system configuration diagram of the present invention.
FIG. 8 is a flow chart of reliability analysis in a data processing system.
FIG. 9 is a flow diagram of removing outliers in a data processing system.
FIG. 10 is a flow chart of stress accuracy assessment in a data processing system.
Description of reference numerals: 1-holes; 2-monitoring equipment, 3-transmission cable; 4-strain gauge; 5-strain flower.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to the attached drawings, the long-term stress monitoring system based on the perforated diaphragm wall comprises monitoring equipment for monitoring diaphragm wall strain data, a data acquisition device for acquiring the strain data, a data processing system for performing stress analysis, and an alarm module for alarming when the monitored diaphragm wall stress value reaches an early warning value,
in the embodiment, the depth of the diaphragm wall is 20m, the thickness is 60cm, and each section is 6m long; two holes with the diameter of 36mm extending in the vertical direction are formed in the top surface of the diaphragm wall, the positions of the holes are enabled to avoid the diaphragm wall reinforcement cage, the distance between the centers of the two holes and the inner wall and the outer wall is 30cm, and the distance between the centers of the two holes and the connecting side of the wall is 1.5 m. The distance between the centers of the two holes 1 is 3 m; the size of the hole is matched with that of the monitoring equipment, and the hole penetrates through the bottom surface of the diaphragm wall; enough distance is reserved between the connection part of the hole and the underground diaphragm wall and between the inner wall and the outer wall of the underground diaphragm wall, and enough distance is also reserved between the hole and the hole;
the monitoring device is arranged in the hole, can be placed in the hole at a certain depth to acquire strain data for a long time to analyze the change of stress along with time, and can be taken out of the hole and put into new equipment if damaged. The monitoring equipment is a hollow inclusion strain gauge, the hollow inclusion strain gauges are arranged in the holes every two meters, and each hole is provided with 10 strain gauges; the hollow inclusion strain gauge comprises an epoxy resin cylinder, wherein three groups of strain patterns for measuring stress are adhered to the outer wall of the epoxy resin cylinder at intervals of 120 degrees along the circumferential direction, and each group of strain patterns consists of 4 strain sheets in different directions; the 4 strain gages are sequentially arranged from top to bottom along the axial direction of the hollow inclusion stress meter, wherein the strain gage positioned at the head is obliquely arranged towards the lower right, the strain gage positioned at the second position is obliquely arranged along the horizontal direction, the strain gage positioned at the third position is obliquely arranged towards the upper right, and the strain gage positioned at the last position is vertically arranged; the included angle between the strain gauge positioned at the first position and the strain gauge positioned at the second position is 45 degrees, and the included angle between the strain gauge positioned at the second position and the strain gauge positioned at the third position is 45 degrees. The outer side of the strain flower is coated with an epoxy resin layer, so that the strain flower is embedded in the outer wall of the epoxy resin cylinder; an inner cavity of the epoxy resin cylinder is provided with an epoxy resin adhesive used for being adhered with the inner wall of the hole. The outer diameter of the strain gauge is 35.5mm, the working length is 150mm, and the strain gauge can be installed in a hole with the diameter of 36-38 mm.
The hollow inclusion stressometer is electrically connected with the data acquisition device through a transmission cable, and transmits the strain data to the data acquisition device; in the embodiment, the data acquisition device adopts an intelligent hollow inclusion stressometer data acquisition instrument, and the data acquisition device is connected with the monitoring equipment 2 through an RS-232 interface and a transmission cable 3. Each data acquisition instrument can simultaneously receive the data of 5 hollow inclusion stressometers. The storage module of the data acquisition instrument is 32GB and is used for storing the strain data transmitted by the monitoring equipment. The data acquisition instrument is provided with a wireless signal transmitting device and is used for transmitting the strain data to a data processing system;
in this embodiment, the data processing system adopts a cloud computing service system, and includes a data receiving and storing module, a stress analysis module, a reliability analysis module, and a data transmission module; the data receiving and storing module receives and stores the strain data transmitted by the data acquisition device; the stress analysis module comprises a stress calculation submodule, a quality control submodule and a stress precision evaluation submodule; the stress calculation program comprises primary calculation and secondary calculation after factors such as creep and temperature are considered, and the stress calculation program is used for calculating stress data; the quality control program is used for removing abnormal values, and the method for removing the abnormal values comprises the following steps: obtaining residual errors of the stress components and the stress record values by using a least square method; the normal residual error is applied with a student program to obtain a student residual error, and a stress record value is called an abnormal value if the chemical-biochemical residual error is much larger than the student residual errors of other values, and the abnormal value has a larger influence on the estimation result. Therefore, it is necessary to eliminate the abnormal value. And after eliminating the abnormal value, performing least square solution on the stress component again. The root mean square error of the stress component can be known by an error theory, and the main stress magnitude direction and the error thereof can be obtained by further corresponding coordinate conversion. And then, removing abnormal values by circularly applying a student residual absolute value method to obtain an optimal stress analysis value. And evaluating the stress analysis value after the abnormal value is removed by a stress precision evaluation program, and judging whether the obtained stress data meets the relevant specifications. The reliability analysis module performs reliability analysis on the stress analysis result to obtain a reliability analysis result; the data transmission module sends the stress analysis result and the reliability analysis result to the PC terminal, and sends alarm information to the PC terminal when the monitored stress exceeds an early warning value;
the data processing system is in wireless communication connection with the PC end, performs stress analysis according to the strain data, sends an analysis result to the PC end, and sends alarm information to the PC end when the monitored stress exceeds an early warning value; the method comprises the steps that field monitoring personnel access a cloud computing service system in real time through a PC end to observe the stress variation trend of the diaphragm wall, when an alarm program in the cloud computing service system receives information that an actual stress value is larger than a predetermined alarm value, the system can send alarm information to the PC end, an alarm device connected with the PC on site comprises an LED indicating lamp and an alarm and can react, the LED indicating lamp can flicker, and the alarm can make a sound. The early warning system can give an alarm to abnormal conditions occurring in the stress monitoring process of the diaphragm wall in real time, and effectively reduces potential safety hazards.
A monitoring method of a long-term stress monitoring system based on a perforated diaphragm wall comprises the following steps:
1.1) the stress state of the diaphragm wall section of the measuring area can reflect the condition of the section, and the selected measuring area is representative;
1.2) the stratum complexity around the width section of the diaphragm wall of the measurement area can influence the diaphragm wall stress;
1.3) other construction projects are in progress around the diaphragm wall section of the measuring area.
2.1) inserting a plurality of rigid pipes before pouring concrete in the diaphragm wall, and sealing the lower openings of the rigid pipes before inserting the rigid pipes;
2.2) checking whether the rigid pipe is vertical to the underground diaphragm wall for grooving, and sealing the upper opening of the rigid pipe after the requirement is met;
and 2.3) after concrete is poured, gradually pulling out the pre-buried rigid pipe by using a pipe drawing machine.
the stress analysis comprises the following steps:
(5.1.1) performing preliminary stress calculation on the received stress data by using a stress calculation program to obtain preliminary stress data;
(5.1.2) processing the preliminary stress data by considering creep factors to obtain a stress recorded value;
(5.1.3) solving a stress component of the stress record value by adopting a least square method;
(5.1.4) calculating a stress record residual error;
(5.1.5) applying a biochemical program to the residual stress record value to calculate a biochemical residual error, and removing an abnormal record value by using a biochemical residual error absolute value method;
(5.1.6) carrying out least square solution on the stress data with the abnormal points removed again, and then removing abnormal recorded values by circularly applying a student residual absolute value method to obtain an optimal stress analysis result;
(5.1.7) stress precision evaluation is carried out on the stress analysis result, and the stress precision evaluation comprises main stress value precision evaluation and main stress direction precision evaluation to obtain an evaluation result.
The reliability analysis comprises the following steps:
(5.2.1) carrying out relative error analysis on the stress data in the single hole;
(5.2.2) evaluating the standard deviation of the stress data in the porous hole;
(5.2.3) evaluating the data according to geological and depth conditions, intensity criteria, statistical rules and a known stress database;
(5.2.4) comprehensively evaluating by combining the underground water and the temperature factors to obtain a reliability analysis result.
Specifically, the relative error of single hole measurement data is judged, the existing basic database is used for judging after the single hole measurement data meet the standard specification, and then each criterion in the stress state is used for further inspection. And (4) sorting and fitting the data of a plurality of measuring holes in the measuring area to obtain the stress state of the area, and simultaneously, evaluating the reliability by using the standard deviation and the fitted residual error. And finally, the result can be further compared with a basic database, and can be evaluated according to the data quality standard and input into the basic data. And when the analysis program evaluates the calculation result according to the basic database, the analysis program also gives results of other judgment standards for the research of monitoring personnel. Generally, the stress values should meet the strength criteria, and if extremely high stress strength ratios are present, they should be considered as outliers. Geological and depth conditions and statistical rules are also important judgment bases to be evaluated and analyzed in combination with actual conditions. The influence of the above-mentioned criteria on the stress measurement by the peripheral factors of the actual measurement position is not sufficiently considered, so that the analysis program can evaluate the influence of the peripheral factors, such as peripheral buildings, underground water and the like, on the result. In addition, temperature and other factors may also affect the results, and a temperature affecting module may be added to the analysis process if necessary.
Step 6, the PC end displays the analysis result and transmits the received alarm information to the alarm device;
and 7, the alarm device sends an alarm notice to the monitoring personnel according to the alarm signal.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.
Claims (5)
1. The utility model provides a long-term stress monitoring system based on perforation formula ground is wall even, is including the monitoring facilities who is used for monitoring ground even wall strain data, be used for gathering strain data's data acquisition device, be used for carrying out stress analysis's data processing system and be used for carrying out the alarm module that reports to the police when the ground that monitors even wall stress value reaches early warning value, its characterized in that: the top surface of the diaphragm wall is provided with a plurality of holes extending along the vertical direction, the positions of the holes are enabled to avoid the diaphragm wall reinforcement cage, and the holes are uniformly distributed along the length of the diaphragm wall at equal intervals; the size of the hole is matched with that of the monitoring equipment, and the hole penetrates through the bottom surface of the diaphragm wall;
the monitoring equipment is a hollow inclusion stressometer, the hollow inclusion stressometers are arranged at intervals along the axial direction of the hole, and strain flowers for measuring stress are arranged on the hollow inclusion stressometers; the hollow inclusion stressometer is electrically connected with the data acquisition device through a transmission cable, and transmits the strain data to the data acquisition device; the data acquisition device is in wireless communication connection with the data processing system, stores the strain data and transmits the strain data to the data processing system; the data processing system is in wireless communication connection with the PC end;
the data processing system comprises a data receiving and storing module, a stress analysis module, a reliability analysis module and a data transmission module; the data receiving and storing module receives and stores the strain data transmitted by the data acquisition device; the stress analysis module comprises a stress calculation submodule, a quality control submodule and a stress precision evaluation submodule, the stress calculation submodule is used for calculating a stress analysis value, the quality control submodule is used for removing an abnormal value, and the stress precision evaluation submodule evaluates the stress analysis value; the stress analysis module calls the strain data in the data receiving and storing module, and calculates and evaluates the strain data corresponding to the variable data to obtain a stress analysis result; the reliability analysis module performs reliability analysis on the stress analysis result to obtain a reliability analysis result; the data transmission module sends the stress analysis result and the reliability analysis result to the PC terminal, and sends alarm information to the PC terminal when the monitored stress exceeds an early warning value;
the PC end is electrically connected with the alarm device, displays an analysis result and transmits a received alarm signal to the alarm device; the alarm device comprises an LED indicator light and an alarm for sending alarm notification to monitoring personnel.
2. A perforated diaphragm wall based long term stress monitoring system as claimed in claim 1 wherein: the hollow inclusion strain gauge comprises an epoxy resin cylinder, wherein three groups of strain patterns for measuring stress are adhered to the outer wall of the epoxy resin cylinder at intervals of 120 degrees along the circumferential direction, and each group of strain patterns consists of 4 strain sheets in different directions; the outer side of the strain flower is coated with an epoxy resin layer, so that the strain flower is embedded in the outer wall of the epoxy resin cylinder; an inner cavity of the epoxy resin cylinder is provided with an epoxy resin adhesive used for being adhered with the inner wall of the hole.
3. A perforated diaphragm wall based long term stress monitoring system as claimed in claim 2 wherein: the 4 strain gages are sequentially arranged from top to bottom along the axial direction of the hollow inclusion stressometer, wherein the strain gage positioned at the head is obliquely arranged towards the lower right, the strain gage positioned at the second position is obliquely arranged along the horizontal direction, the strain gage positioned at the third position is obliquely arranged towards the upper right, and the strain gage positioned at the last position is vertically arranged; the included angle between the strain gauge positioned at the first position and the strain gauge positioned at the second position is 45 degrees, and the included angle between the strain gauge positioned at the second position and the strain gauge positioned at the third position is 45 degrees.
4. A perforated diaphragm wall based long term stress monitoring system as claimed in claim 1 wherein: the data acquisition device comprises a storage module and a wireless signal transmitting device, wherein the storage module is used for storing the strain data transmitted by the monitoring equipment, and the wireless signal transmitting device is used for transmitting the strain data to the data processing system.
5. A perforated diaphragm wall based long term stress monitoring system as claimed in claim 1 wherein: the hole is located at the center of the thickness direction of the diaphragm wall.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358481A (en) * | 2021-05-28 | 2021-09-07 | 煤炭科学技术研究院有限公司 | Stress monitoring system and method for waterproof airtight wall of underground goaf |
| CN115479711A (en) * | 2022-10-19 | 2022-12-16 | 中国科学院武汉岩土力学研究所 | Hard-shell bag body stress meter for three-dimensional stress of underground engineering and monitoring system |
-
2020
- 2020-09-03 CN CN202021895093.6U patent/CN213148168U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358481A (en) * | 2021-05-28 | 2021-09-07 | 煤炭科学技术研究院有限公司 | Stress monitoring system and method for waterproof airtight wall of underground goaf |
| CN115479711A (en) * | 2022-10-19 | 2022-12-16 | 中国科学院武汉岩土力学研究所 | Hard-shell bag body stress meter for three-dimensional stress of underground engineering and monitoring system |
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