CN215330086U - Automatic early warning system of foundation ditch engineering monitoring - Google Patents
Automatic early warning system of foundation ditch engineering monitoring Download PDFInfo
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- CN215330086U CN215330086U CN202121464596.2U CN202121464596U CN215330086U CN 215330086 U CN215330086 U CN 215330086U CN 202121464596 U CN202121464596 U CN 202121464596U CN 215330086 U CN215330086 U CN 215330086U
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Abstract
The utility model discloses a foundation pit engineering monitoring automatic early warning system which is used for solving the problem that the existing early warning system is insufficient in intelligent degree. The system comprises automatic data acquisition equipment consisting of distributed wireless acquisition nodes and a wireless gateway, and a data acquisition element consisting of an embedded intelligent liquid level measurement sensor, a gyroscope, an axial force meter and an inclinometer, wherein the embedded intelligent liquid level measurement sensor, the gyroscope, the axial force meter and the inclinometer are respectively connected with the distributed wireless acquisition nodes through data lines, and the distributed wireless acquisition node data are connected with a management platform through the wireless gateway and the internet to transmit the data. The system returns data in real time all day long, is not interfered by rainfall weather, and can control data change under extreme weather conditions.
Description
Technical Field
The utility model relates to a foundation ditch safety precaution technical field is an automatic early warning system of foundation ditch engineering monitoring particularly.
Background
The foundation pit engineering is a system engineering, which relates to the soil body strength and the soil body stability, also relates to the soil body deformation, and also comprises the interaction between soil and a building enclosure. Because the analysis of the problems depends on the improvement and perfection of the means such as the soil pressure theory, the calculation method, the test means, the construction technology and the like, the foundation pit accidents happen sometimes due to the difference between the theoretical calculation model and the actual situation, and people are warned.
The construction accident of the foundation pit engineering is a process from quantitative change to qualitative change, although the construction monitoring can monitor the quantitative change, the sudden occurrence of the foundation pit disaster can be caused by various external sudden changes such as sudden change of hydrogeological conditions, untimely support, rainfall, slope top loading, improper construction and assembly and the like due to the limitation and poor timeliness of the traditional monitoring means. At present, the standard, instruments and means of foundation pit deformation monitoring are gradually improved, and an automatic monitoring technology is also applied to the construction process of a deep foundation pit.
For example, the following patent documents have been studied from different perspectives and different technical means:
CN204288455U discloses a foundation ditch deformation early warning device. The device comprises an alarm, a sliding switch and a telescopic rod, wherein the sliding switch is provided with an insulating section, a conductor section and a sliding contact, one end of the sliding contact is connected with the telescopic rod, and the other end of the sliding contact is movably connected with the conductor section or the insulating section; when the foundation pit deforms, the telescopic rod is driven to extend or shorten, the sliding contact is driven to slide to the conductor section through the insulation section, the alarm, the conductor section and the sliding contact are electrically connected, and the alarm works. The basic principle of the utility model is that the distance change of the two sides of the foundation pit wall can drive the telescopic rod to extend or compress, and further drive the sliding point of the sliding control switch to move, so as to control the closing of the intelligent early warning circuit system, thereby effectively early warning the engineering accident of the foundation pit.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides an automatic early warning system for monitoring foundation pit engineering, which is used for solving the problem that the existing early warning system is insufficient in intelligent degree.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
automatic early warning system of foundation ditch engineering monitoring, including the automatic data acquisition equipment who comprises distributing type wireless acquisition node and wireless gateway to and the data acquisition component who comprises embedded intelligent level measurement sensor, gyroscope, axial force meter and inclinometer, wherein, embedded intelligent level measurement sensor, gyroscope, axial force meter and inclinometer connect distributing type wireless acquisition node through the data line respectively, distributing type wireless acquisition node data passes through wireless gateway and internet connection management platform, carries out the transmission of data.
The inclinometers are arranged at intervals of 10-20 m in the longitudinal direction of the foundation pit.
The axial force meters are arranged in the steel supports, wherein in the steel supports of each layer, the appropriate steel supports are selected to arrange the axial force meters, and the number of the axial force meters arranged in each layer of the steel supports is not less than 12.
The gyroscopes are arranged along the side slope of the foundation pit at intervals of 15-20 m in the longitudinal direction.
The embedded intelligent liquid level measuring sensors are arranged one at each interval of 15-25 m in the longitudinal direction of the foundation pit.
The depth of the foundation pit engineering pit is not less than 10 meters.
The utility model has the beneficial effects that:
(1) the sensor has high precision and reliable performance; the installation is simple and convenient, and common personnel can implement the operation; the energy consumption is low, and the field environment is free of maintenance for more than five years; intelligent noise resistance and intelligent identification processing of interference data; the cost performance is high, and the method is suitable for large-scale popularization and application.
(2) Data are transmitted automatically, a report curve is generated automatically, the workload of field workers is reduced, the operation efficiency is greatly improved, and the damage or damage is not easy to occur.
(3) And (4) directly sensing and monitoring. The sensor directly senses the micro deformation dynamic state of the rock and soil mass or the structure, and monitors and warns in real time.
(4) The device has a good extension function, is connected with various monitoring instruments, and forms omnibearing three-dimensional monitoring.
(5) The data is returned in real time in all weather, is not interfered by rainfall weather, and can be controlled to change under extreme weather conditions.
Drawings
Fig. 1 is a sectional view of a foundation pit.
Fig. 2 is an installation diagram of an embedded intelligent level measurement sensor.
Fig. 3 is a schematic block diagram of the present invention.
In the figure: 01 fender pile, 02 steel support, 03 embedded intelligent level measurement sensor.
Detailed Description
In this embodiment, the enclosure structure of the foundation pit adopts a cast-in-situ bored pile and steel support supporting form, wherein the pile diameter of the enclosure pile 01 is 800mm, and the support is phi 600t =14mm steel support 02. The water-stopping curtain adopts the water stopping among the piles of the single-tube high-pressure jet grouting pile, the 120-degree directional jet grouting is carried out among the piles close to the outer side of the foundation pit, the thickness of 60cm is carried out among the bored cast-in-place piles, and the single-tube high-pressure jet grouting water-stopping pile penetrates through the permeable layer and enters the impermeable layer by more than 1 m. C20 concrete is sprayed between piles near the inner side of the foundation pit for leveling, and a facing reinforcing mesh with the diameter of 8-10 cm is arranged.
Taking a box culvert section deep foundation pit as an example, referring to fig. 1, in the section, the section span of the section of the foundation pit is 28.5 meters, the depth of the foundation pit is 10.5-12.0 m, and phi 80cm bored concrete piles (with the distance of 120 cm), two phi 600mm (with the wall thickness of 14 mm) steel pipe transverse supports and upright columns are adopted; the vertical spacing of the cross braces is 4.5m, and the longitudinal spacing is detailed in a drawing; the upright column is a steel lattice column, and the bottom end of the upright column is inserted into an engineering pile by 2 m; the cross section of the support is shown in figure 1. The prefabricated box culvert is arranged in a bidirectional mode.
The monitoring automatic early warning system is used for monitoring the foundation pit section and is described from the following aspects:
firstly, the monitoring purpose is to achieve the following three purposes through information feedback:
(1) the safety of the foundation pit support structure and the adjacent buildings (structures) is ensured;
(2) guiding the excavation of a foundation pit and the construction management of a building enclosure, adjusting construction process parameters and design parameters if necessary, and comprehensively monitoring the environmental influence possibly generated by engineering construction;
(3) and collecting accumulated data for foundation pit engineering design and construction technology. By summarizing the deformation rule and characteristics of deep foundation pit engineering construction, reference, basis and guidance are provided for the development of similar engineering or the construction method in the future.
Secondly, the monitoring objects are in three major categories: namely the engineering supporting structure, the surrounding rock-soil mass and the surrounding environment.
(1) Engineering supporting construction: foundation pit fender posts, a supporting system and the like;
(2) and (3) surrounding rock-soil mass: settling rock and soil mass, underground water and earth surface around the engineering;
(3) ambient environment: surrounding buildings and pipelines.
Secondly, the monitoring content and the monitoring items mainly comprise displacement monitoring, settlement monitoring, inclination monitoring, internal deformation monitoring, water level monitoring, pressure monitoring and the like. All monitoring objects and projects are matched with each other, so that the design and construction requirements are met, and an effective monitoring system with mutual reference and verification is formed. The site monitoring of the foundation pit engineering should adopt a method combining instrument monitoring and inspection.
1. Displacement monitoring
The significance of displacement monitoring is as follows: when earth excavation operation is carried out, the pile body of the foundation pit directly receives the action of earth pressure, so that the foundation pit slowly moves. The deformation of the foundation pit slope has a great degree of relation with the flexible support and the rigid support. In the application process of the support pile, the pile is a main stressed component, and if the pile is deformed greatly, the pile body is brittle and broken to a certain extent, so that the soil body is mutated, and further safety accidents are caused. Based on this, if pile body day displacement volume when being close to alarm value, need strengthen to it and pay attention to it, if it is all so in two three consecutive days, take relevant measure immediately in needs, avoid taking place serious consequence. When the slope excavation operation is carried out, the daily displacement of the foundation pit also needs to be closely concerned, if the foundation pit displacement of a larger degree occurs, the slope can slide in a certain degree, and then safety accidents occur.
The displacement monitoring data is from a mobile inclinometer, wherein the mobile inclinometer and a guide wheel thereof are settled or lifted along a guide groove of an inclinometer guide pipe. The accelerometer sensor in the inclinometer probe can sensitively measure the inclination angle at each depth. A voltage signal is output and displayed on a panel of a reading instrument, the voltage signal measured by the inclinometer is a sine function of the inclination angle on the standard distance L between an upper guide wheel and a lower guide wheel of the inclinometer at a certain depth by taking the guide groove of the inclinometer as a direction reference, and the function can be converted into horizontal displacement.
2. Sedimentation monitoring
The foundation pit settlement monitoring work aims at monitoring whether the foundation pit construction can affect the surrounding environment. If the sedimentation value reaches 2mm/d, the accumulated displacement exceeds 10mm, namely the accumulated displacement exceeds the alarm value. Generally, the main reason for the settlement of the building envelope is horizontal displacement, and the settlement condition of the structure close to the foundation pit is usually caused by soil erosion. In the process of monitoring foundation pit settlement, observation points need to be arranged on structures along the foundation pit and the side slope.
In this embodiment, the gyroscope is used to monitor the displacement of the foundation pit.
3. Water level monitoring
In the foundation pit excavation work, water level monitoring is one of them indispensable work content, can effectively prevent drift sand and piping phenomenon. Firstly, the observation holes need to be reasonably arranged, then the water level detecting head is reasonably placed, and when the detecting head contacts the water level line, the buzzer is immediately triggered. The variation of the water level is obtained by subtracting the reference value from the measured value.
In this embodiment, the underground water level monitoring adopts a stainless steel fully-sealed embedded intelligent liquid level measuring sensor 03, refer to fig. 2. According to the principle that the resistance of the sensor is in direct proportion to the water pressure, the sensor measures the water pressure by measuring the change of the resistance, and the water column height is converted by using the 0.01MPa, which is equivalent to 1m high water column pressure, so that the height of the water level in the hole can be obtained through the liquid level meter.
4. Steel support axial force monitoring
Steel shotcrete axle power monitoring needs at inner support tip installation axle dynamometer, and whether the monitoring external environment changes and can influence interior support. When the asymmetric excavation mode is used for unfolding, construction operation is carried out, or the inner support is damaged due to the influence of structural construction, the axial force of the inner support can be influenced to a certain degree, in order to ensure that the structural stress of the inner support is guaranteed to a greater degree, the inner support needs to be effectively monitored, the axial force condition of relevant working departments can be timely mastered, when the axial force exceeds an alarm value, the continuous work is stopped, a design department is informed, a design drawing is modified, timely intervention of reinforcement measures is carried out, and further expansion of potential safety hazards is avoided.
In this implementation, what the axial force meter adopted is vibrating wire type axial force meter, and this axial force meter mainly comprises atress round steel, presss from both sides string ware, induction coil and high strength steel wire. The exciting circuit drives the sensor coil, and when the frequency of the exciting signal is close to the natural frequency of the steel string, the steel string reaches the resonance state quickly. When the excitation signal is removed, the string still vibrates at its natural frequency for a period of time. The induction signal generated by vibration is filtered, amplified and shaped by the monitoring circuit of the collecting instrument, and then collected, the vibration frequency of the string can be measured by measuring the pulse period of the induction signal, and then the stress conversion is carried out.
The automatic monitoring of the supporting axial force is realized by matching a vibrating wire type sensor with a multi-channel vibrating wire acquisition instrument and a data transmission processing system.
5. Automatic change collection equipment
The automatic acquisition equipment is shown in fig. 3, and the field automatic data acquisition equipment consists of distributed wireless acquisition nodes and wireless gateways. The distributed wireless acquisition nodes are connected with sensors such as a water level monitor, an axial force meter and an automatic inclinometer through data lines, the wireless node data send acquired data to the wireless gateway through a self-built wireless network, and the wireless gateway transmits the data to the management platform through the Internet.
The arrangement of monitoring points is determined by combining the influence subareas and the monitoring grades:
(1) the inclinometers are arranged along the longitudinal direction of the foundation pit and are spaced by 10-20 m, namely the movable inclinometers are arranged along the longitudinal direction of the foundation pit at intervals of 10-20 m.
(2) And the axial force meters are arranged in the steel supports, wherein the appropriate steel supports are selected from the steel supports of each layer, and not less than 12 axial force meters are arranged in the steel supports of each layer.
(3) The gyroscopes for monitoring ground settlement are arranged at intervals of 15-20 m along the side slope of the foundation pit.
(4) Monitoring underground water level, the intelligent level measurement sensor of stainless steel totally enclosed embedded, every interval sets up one 15 ~ 25m along the foundation ditch is vertical.
Through the arrangement, the integrity of data acquisition can be ensured.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (6)
1. The foundation pit engineering monitoring automatic early warning system is characterized by comprising automatic data acquisition equipment consisting of distributed wireless acquisition nodes and a wireless gateway and a data acquisition element consisting of an embedded intelligent liquid level measurement sensor, a gyroscope, an axial force meter and an inclinometer, wherein the embedded intelligent liquid level measurement sensor, the gyroscope, the axial force meter and the inclinometer are respectively connected with the distributed wireless acquisition nodes through data lines, and the distributed wireless acquisition node data are connected with a management platform through the wireless gateway and the Internet.
2. The foundation pit engineering monitoring automatic early warning system of claim 1, wherein the inclinometers are arranged at intervals of 10-20 m along the longitudinal direction of the foundation pit.
3. The foundation pit engineering monitoring automatic early warning system of claim 1, wherein the axial force meters are arranged in steel supports, wherein in the steel supports of each layer, the appropriate steel supports are selected to arrange the axial force meters, and the number of the axial force meters arranged in each layer of steel supports is not less than 12.
4. The foundation pit engineering monitoring automatic early warning system according to claim 1, wherein the gyroscope is arranged along the foundation pit slope at intervals of 15-20 m in the longitudinal direction.
5. The foundation pit engineering monitoring automatic early warning system according to claim 1, wherein the embedded intelligent liquid level measuring sensors are arranged one at each interval of 15-25 m along the longitudinal direction of the foundation pit.
6. The foundation pit engineering monitoring automated early warning system of claim 1, wherein the foundation pit engineering pit depth is no less than 10 meters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121464596.2U CN215330086U (en) | 2021-06-29 | 2021-06-29 | Automatic early warning system of foundation ditch engineering monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121464596.2U CN215330086U (en) | 2021-06-29 | 2021-06-29 | Automatic early warning system of foundation ditch engineering monitoring |
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| CN215330086U true CN215330086U (en) | 2021-12-28 |
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| CN202121464596.2U Active CN215330086U (en) | 2021-06-29 | 2021-06-29 | Automatic early warning system of foundation ditch engineering monitoring |
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2021
- 2021-06-29 CN CN202121464596.2U patent/CN215330086U/en active Active
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Effective date of registration: 20220325 Address after: 250000 No. 14677, Jingshi Road, Lixia District, Jinan City, Shandong Province Patentee after: SHANDONG LUQIAO GROUP Co.,Ltd. Patentee after: shandong jiaotong university Address before: 250014 no.14677, Jingshi Road, Lixia District, Jinan City, Shandong Province Patentee before: SHANDONG LUQIAO GROUP Co.,Ltd. |