CN211696331U - Cast-in-place support strain monitoring system - Google Patents
Cast-in-place support strain monitoring system Download PDFInfo
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- CN211696331U CN211696331U CN201922073487.7U CN201922073487U CN211696331U CN 211696331 U CN211696331 U CN 211696331U CN 201922073487 U CN201922073487 U CN 201922073487U CN 211696331 U CN211696331 U CN 211696331U
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Abstract
The utility model provides a strain monitoring system of a cast-in-situ bracket, wherein a surface strain gauge is arranged on a rod piece of the cast-in-situ bracket; the surface strain gauge is in communication connection with the dynamic and static strain acquisition instrument, detects strain data of the rod piece and transmits the strain data to the dynamic and static strain acquisition instrument; the dynamic and static strain acquisition instrument is in communication connection with the cloud data processing platform through the wireless communication module, the strain data are transmitted to the cloud data processing platform in a wireless communication mode, the cloud data processing platform analyzes, arranges and stores the strain data, and when the strain data exceed a threshold value, an alarm prompt is sent out through the remote control alarm; monitoring personnel are connected with the cloud data processing platform through the terminal to acquire monitoring data information. The method has the advantages of realizing data acquisition, storage, analysis and application, ensuring that accurate data is stably acquired for a long time, and feeding back the health condition of the structure to a user in real time through calculation and analysis of the data.
Description
Technical Field
The utility model relates to an engineering construction technical field especially relates to a cast-in-place support strain monitoring system.
Background
The cast-in-place support adopts scaffolds which are densely arranged at certain intervals and play a supporting role. The method is commonly used for cast-in-place bridge construction and cast-in-place floor construction at present. Cast-in-place support construction is a long-term method, and a large number of formwork supports are needed during construction. The construction of the support method is that a support is erected at a bridge position, bridge body concrete is poured on the support, and a template and the support are removed after the concrete reaches the strength. The support method has the biggest advantage of not needing large-scale hoisting equipment in construction, and has the defects of large consumption of support templates for construction, long construction period and great limitation on mountainous bridges and high piers.
At present, a cast-in-place part completely adopts a novel socket type disc buckle type support. The support system has complex and variable strain, high safety requirement and larger construction risk.
In order to know the safety condition of the support, the strain condition of the support is monitored, so that the strain condition of the support can be known, and the support stability of the cast-in-place support is guaranteed. How to accurately grasp the bracket strain situation and realize monitoring the bracket strain situation is a technical problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
In order to overcome not enough among the above-mentioned prior art, the utility model provides a cast-in-place support monitoring system that meets an emergency, include: the system comprises a dynamic and static strain acquisition instrument, a surface strain meter, a cloud data processing platform, a wireless communication module and a remote control alarm;
the surface strain gauge is arranged on a rod piece of the cast-in-place support;
the surface strain gauge is in communication connection with the dynamic and static strain acquisition instrument, detects strain data of the rod piece and transmits the strain data to the dynamic and static strain acquisition instrument;
the dynamic and static strain acquisition instrument is in communication connection with the cloud data processing platform through the wireless communication module, the strain data are transmitted to the cloud data processing platform in a wireless communication mode, the cloud data processing platform analyzes, arranges and stores the strain data, and when the strain data exceed a threshold value, an alarm prompt is sent out through the remote control alarm;
monitoring personnel are connected with the cloud data processing platform through the terminal to acquire monitoring data information.
Further, it should be noted that the method further includes: a plurality of spanning surfaces; each span surface is provided with a cast-in-place beam support, and a pier stud is connected between the span surface and the span surface;
the cast-in-place support supports the span surface, the cast-in-place beam and the pier stud respectively;
at least four surface strain gauges are arranged on a rod piece of a cast-in-place support which is supported at the pier column;
at least six surface strain gauges are mounted on a rod piece of a cast-in-place support supported at the cast-in-place beam, and the surface strain gauges are uniformly distributed along the transverse axis of the cast-in-place beam;
each span surface is provided with a plurality of cast-in-place beams, and at least two cast-in-place beam brackets of each span surface are provided with surface strain gauges.
It should be further noted that the cloud data processing platform is configured with a plurality of communication channels, a data processing module and a data display module; each communication channel is configured with a channel label;
each communication channel is correspondingly connected with one surface strain gauge; the communication address of the surface strain gauge is matched with the channel mark;
the data display module is provided with a strain change coordinate system; the X axis of the strain change coordinate system is a strain change time axis, and the Y axis is a strain change parameter axis;
and configuring a plurality of strain change curves in the strain change coordinate system, wherein each curve corresponds to one communication channel.
It should be further noted that the cloud data processing platform is further configured with a user login operation port, a two-dimensional code login operation port, a monitored object selection operation port, an alarm statistics display port, an upper and lower limit value display port of a strain threshold, a communication channel switching control port and a user information configuration operation port.
The utility model also provides a cast-in-place support strain monitoring method, the method includes:
presetting the position for mounting the surface strain gauge;
processing a cast-in-place support rod piece for mounting the surface strain gauge, and mounting the surface strain gauge after processing;
connecting each surface strain gauge with a dynamic and static strain acquisition instrument respectively;
the dynamic and static strain acquisition instrument is in communication connection with the cloud data processing platform;
switching on a power supply, and debugging whether each communication channel can work normally;
configuring a balance initial number, and if the initial data is not zero, adjusting the initial data to be a base point;
and monitoring the strain data of the rod piece according to the monitoring control command, and analyzing, sorting and storing the monitoring data.
It should be further noted that the step of monitoring the strain data of the rod further includes:
and in the preloading process, monitoring preloading data in real time, staying for a preset time when the preloading reaches three preset values of 60%, 80% and 100% of the preset values, monitoring and judging whether the pre-pressure exceeds a threshold value.
Further, the dynamic and static strain acquisition instrument uploads strain data to the cloud data processing platform in real time; the strain data displayed by the data display module changes; monitoring personnel are connected with the cloud data processing platform through the mobile terminal to acquire monitoring data information in real time.
It should be further noted that, the step of processing the cast-in-place support rod member for installing the surface strain gauge further includes:
marking the position of the surface strain gauge;
polishing the surface of the rod piece provided with the surface strain gauge, removing paint stains on the surface of the rod piece, and adhering the surface strain gauge and the rod piece;
and adjusting the position of the surface strain gauge to meet the measurement requirement, and respectively coating adhesive on the surfaces of the surface strain gauge and the rod piece, or fixedly arranging the surface strain gauge on the surface of the rod piece in a welding mode or a buckling mode.
According to the technical scheme, the utility model has the advantages of it is following:
the utility model relates to a system is used for large-scale infrastructure structures such as bridge, tunnel, subway, foundation ditch, tailing to monitor the field in security on line. The cloud data processing platform realizes data acquisition, storage, analysis and application, ensures that accurate data is stably acquired for a long time, and feeds back the health condition of the structure to a user in real time through calculation and analysis of the data. When the structure has an alarm, after the technical personnel confirm that the alarm information is real, the alarm information is sent to a user management unit at the first time, so that the occurrence of safety accidents is reduced, and the data of the structure serves the structure. If an emergency occurs, all personnel on the site can be informed at the first time through the alarm on the site, and the short message can be informed at the first time through the terminal.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a cast-in-place support strain monitoring system;
FIG. 2 is a schematic view of an embodiment of a cast-in-place stent strain monitoring system;
FIG. 3 is a schematic longitudinal sectional view of a selected position of a measuring point;
FIG. 4 is a schematic plan view of a selected position of a measuring point;
FIG. 5 is a cross-sectional view taken at position A in FIG. 4;
FIG. 6 is a cross-sectional view taken at position B of FIG. 4;
FIG. 7 is a schematic view of an embodiment of a cast-in-place support strain monitoring system;
FIG. 8 is a schematic diagram of a cloud data processing platform;
FIG. 9 is a schematic diagram of a cloud data processing platform;
FIG. 10 is a schematic diagram of a cloud data processing platform;
fig. 11 is a schematic diagram of a cloud data processing platform.
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The utility model provides a cast-in-place support monitoring system that meets an emergency, as shown in FIG. 1, include: the system comprises a dynamic and static strain acquisition instrument 2, a surface strain gauge 1, a cloud data processing platform 4, a wireless communication module 3 and a remote control alarm 5;
the surface strain gauge 1 is arranged on a rod piece of the cast-in-place support;
the surface strain gauge 1 is in communication connection with the dynamic and static strain acquisition instrument 2, the surface strain gauge 1 detects strain data of the rod piece and transmits the strain data to the dynamic and static strain acquisition instrument 2; the strain acquisition mode is that the surface strain gauge 1 is pressed, and the data is reduced; the surface strain gauge 1 is pulled and the data becomes larger. Monitoring data is obtained by technical staff through downloading from the cloud data processing platform 4 through a terminal, and the obtained data is analyzed and sorted.
The dynamic and static strain acquisition instrument 2 is in communication connection with the cloud data processing platform 4 through the wireless communication module 3,
the dynamic and static strain acquisition instrument 2 is communicatively connected to the cloud data processing platform 4, and may be transmitted by any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.
The dynamic and static strain acquisition instrument 2 transmits the strain data to the cloud data processing platform 4 in a wireless communication mode, the cloud data processing platform 4 analyzes, sorts and stores the strain data corresponding to the strain data, and when the strain data exceeds a threshold value, an alarm prompt is sent out through the remote control alarm 5; monitoring personnel are connected with the cloud data processing platform 4 through terminals to obtain monitoring data information.
Wherein the utility model discloses what the strain data of the member that will detect can be considered is because the external reason (atress, humidity change etc.) when warping, produces the internal force of interact between each part in the object to the effect of resisting this external reason, and try hard to make the object resume the position before warping from the position after warping. The internal force per unit area at a certain point of the section under consideration is called stress. Perpendicular to the cross section is called normal stress or normal stress and tangential to the cross section is called shear stress or shear stress. The stress increases with increasing external force, and for a certain material, there is a limit to the increase in stress beyond which the material will fail. For a material, this limit to which stress can be reached is called the ultimate stress of the material. The ultimate stress value is determined by mechanical testing of the material. The maximum stress value of the material which can work safely is defined by properly reducing the measured ultimate stress, and the maximum value is the allowable stress. For safe use, the material should have a stress below its ultimate stress during use, otherwise the material will fail during use.
Normal stress: σ ═ W/a (kg/mm2) W tensile or compressive load (kg) a cross-sectional area (mm2) (2 is square)
Shear stress: Ws/A (kg/mm2) Ws shear force load (kg) A cross-sectional area (mm2) (2 is square)
Also: strain, modulus of elasticity, poisson's ratio, stress concentration, thermal stress, allowable stress, and safety factor.
The strain of the present invention is also called "relative deformation". Physical quantity of an object which relatively changes its geometry and dimensions due to external factors (load, temperature change, etc.). The deformation (elongation or shortening) of a certain line segment of the object in unit length, namely the ratio of the change of the length of the line segment to the original length of the line segment, is called as 'positive strain' or 'line strain' and is symbolized; the change in the angle between two intersecting line segments, referred to as "shear strain" or "angular strain," is denoted by the symbol γ.
Specifically, the elastomer undergoes a shape change (referred to as "strain") upon application of an external force, and the "elastic modulus" is generally defined as: stress divided by strain. The calculation formula is as follows: e ═ σ/, E is the elastic modulus, σ is the stress, and is the strain. The specific meanings are as follows:
stress is defined similarly to pressure, i.e. force per unit area, and is calculated by the formula of σ F/a, which indicates the magnitude of force per unit area, and strain is the ratio of the deformation of the rod to the total length, similar to elongation.
In a preferred embodiment, for example, the coil buckle support upright rod is made of a steel pipe with the material Q345, the diameter of the steel pipe is 60mm, and the wall thickness of the steel pipe is 3.2 mm. The elastic modulus E of the steel material is 206000N/mm2 is 206X 1011 Pa.
Calculating the bearing capacity of the vertical rod:
the concrete bearing area of the two vertical rods is 2.06m2The vertical rods are longitudinally spaced by 1.5m, as shown in figure 2;
1) loading:
a. the self weight of the beam: 26KN/m3×2.06m2×1.5m＝80.34kN
b. Self weight of the template: 0.5KN/m2×1.95m×1.5m＝1.46kN
c. Load of constructors and equipment: 3KN/m2×1.95m×1.5m＝8.78kN
d. Vibrating load: 2KN/m2×1.95m×1.5m＝5.85kN
e. The self weight of the support frame body is 0.15KN/m3× 1.95.95 m × 1.5.5 m × 10m (action frame height) 4.39kN
2) Load combination:
the constant load polynomial coefficient is 1.2, and the live load polynomial coefficient is 1.4.
Q1The maximum bearing capacity of a single vertical rod is as follows: 100.82/2-50.41 kN
Q2＝1.2×(a+b+e)+1.4×(c+d)＝123.9kN，
The maximum bearing capacity of a single vertical rod is as follows: 123.9/2 61.95KN < 94 kN.
2 maximum values and 5 minimum values exist in the data and are basically at adjacent positions, and the analysis probably causes that the contact area and the mode of the support jacking and the cross beam are different, so that the stress difference of the rod piece is larger; the site finds that the spot is just positioned at the joint of the main keel; the distance between the middle-span brackets is 1.5 meters, which is larger;
the data acquisition analysis shows that the actual stress of the bracket system is between 15KN and 36KN, and the large range probably results from different bracket erecting intervals, irregular box girder shapes and uneven concrete;
after the box girder concrete is completely poured, the maximum bearing capacity of the design of a single rod piece can reach 61.95KN, and the maximum bearing capacity of the design of the single rod piece is more than half of that of the design of the single rod piece, namely 40.27KN, which accounts for about 65 percent of the total concrete; the actually measured data is basically consistent with the checking and calculating data, (the design limit bearing capacity of the vertical rod of the disk buckling type bracket is 94 KN;), so that the south rapid eighth-connection bracket system is in a stable state and meets the construction requirements.
Can see through the utility model relates to a system can monitor cast-in-place support and meet an emergency and change data, realizes cast-in-place support's security.
The dynamic and static strain acquisition instrument 2 can measure the strain stress of the structure and other various physical quantities, such as force, pressure, load, torque and the like. The strain tester is particularly suitable for teaching and model experiments of rock and soil, structures, bridges, vibration test beds and the like and strain tests of various engineering sites. The system can simultaneously acquire and display 60 channel data, and can perform multi-stage connection to improve data acquisition channels.
The surface strain gauge 1 is in a DMYB type, the surface strain gauge 1 is used in steel structure and concrete structure load tests of bridges and large and medium civil structures, long-term detection (monitoring) of surface strain of static, dynamic and static and low-frequency dynamic load tests can be carried out, the installation and the use are convenient, the sensor only needs to be pasted or fixed on the surface of a tested piece by 502 quick glue or epoxy resin AB glue or by a mechanical method, and the sensor can be taken off for repeated use after being used up, so that the cost performance is high. The surface strain gauge 1, the steel plate gauge, the stress-free gauge and other various strain measuring instruments can be formed by additionally arranging matched accessories.
The DMYB type strain gauge fully utilizes the stress characteristic of an elastic element, a special processing technology and a patch moisture-proof sealing technical measure, adopts secondary waterproof sealing treatment, selects a bridge combination mode of a full electric bridge structure, has extremely high output sensitivity coefficient, and has good long-term stability if the DMYB-100 type strain gauge (the surface strain gauge 1) is equivalent to a direct-attached type strain gauge.
The surface strain gauge 1 consists of a front end seat, a rear end seat, a protective tube shell, an elastic element, a strain gauge and a cable, when a structure is stressed or linearly extends and deforms due to temperature change, the strain gauge rigidly connected with the structure generates synchronous deformation, and the strain gauge generates stress change by transmitting vibration strings through the front end seat and the rear end seat, so that the output strain value of the strain gauge is changed. The signal is transmitted to a reading device through a cable, the linear change of the measured structure can be measured, and the ratio of the change to the nominal length of the instrument is the dependent variable.
Whether the monitoring work of the utility model is successful or not is the most important point for measuring point selection; the selected measuring points must be representative, and the final data analysis conclusion is accurate and reliable. According to the support layout in the special construction scheme of the cast-in-place beam 12, the stress analysis results of a support checking book and Midas and SAP2000 software, the selected measuring points are comprehensively considered, and the measured points are calculated to have good representativeness.
The method specifically comprises the following steps: a plurality of spans 11; each span surface 11 is provided with a cast-in-place beam 12 support, and a pier stud 13 is connected between the span surface 11 and the span surface 11; as shown in fig. 3 to 6, the cast-in-place support supports the span 11, the cast-in-place beam 12 and the pier stud 13, respectively;
at least four surface strain gauges 1 are arranged on a rod piece of a cast-in-place support which is supported at the pier stud 13; at least six surface strain gauges 1 are arranged on a rod piece of a cast-in-place support supported at the cast-in-place beam 12, and the surface strain gauges 1 are uniformly distributed along the transverse axis of the cast-in-place beam 12; a plurality of cast-in-place beams 12 are arranged on each span surface 11, and surface strain gauges 1 are arranged on cast-in-place supports of at least two cast-in-place beams 12 on each span surface 11.
In the present invention, as shown in fig. 7 to 11, the cloud data processing platform 4 is configured with a plurality of communication channels 6, a data processing module and a data display module; each communication channel 6 is configured with a channel label; each communication channel 6 is correspondingly connected with one surface strain gauge 1; the communication address of the surface strain gauge 1 is matched with the channel mark; the data display module is provided with a strain change coordinate system; the X axis of the strain change coordinate system is a strain change time axis, and the Y axis is a strain change parameter axis; and configuring a plurality of strain change curves in the strain change coordinate system, wherein each curve corresponds to one communication channel 6.
The cloud data processing platform 4 is also configured with a user login operation port, a two-dimension code login operation port, a monitored object selection operation port, an alarm statistic display port, an upper limit value display port and a lower limit value display port of a strain threshold value, a communication channel 6 switching control port and a user information configuration operation port.
Based on above-mentioned system the utility model discloses a strain monitoring method includes:
presetting the position for mounting the surface strain gauge;
processing a cast-in-place support rod piece for mounting the surface strain gauge, and mounting the surface strain gauge after processing;
connecting each surface strain gauge with a dynamic and static strain acquisition instrument respectively;
the dynamic and static strain acquisition instrument is in communication connection with the cloud data processing platform;
switching on a power supply, and debugging whether each communication channel can work normally;
configuring a balance initial number, and if the initial data is not zero, adjusting the initial data to be a base point;
and monitoring the strain data of the rod piece according to the monitoring control command, and analyzing, sorting and storing the monitoring data.
Wherein, concrete pouring is the most key process in the whole construction process of the cast-in-place beam; in the pouring process, the stress condition of the bracket is complex, the change is large, and the requirement on the overall stability of a bracket system is strict; in the construction process, the monitoring on the support system is crucial from the perspective of construction safety, the actual concrete pouring process is continuously implemented for 24 hours, and generally, personnel are arranged to stare at the support system, but staring at the support system and continuously staring at the support system at night are difficult to ensure staring control effect; in order to meet the requirement of actual construction on site, the monitoring scheme focuses on the whole concrete construction process until the instrument equipment is dismantled before form removal. And in the preloading process, monitoring preloading data in real time, staying for a preset time when the preloading reaches three preset values of 60%, 80% and 100% of the preset values, monitoring and judging whether the pre-pressure exceeds a threshold value.
The dynamic and static strain acquisition instrument uploads strain data to the cloud data processing platform in real time; the strain data displayed by the data display module changes; monitoring personnel are connected with the cloud data processing platform through the mobile terminal to acquire monitoring data information in real time.
The mobile terminal may be implemented in various forms. For example, the terminal described in the embodiments of the present invention may include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a personal digital assistant, a tablet device, and the like, and a fixed terminal such as a digital TV, a desktop computer, and the like. The terminal is a mobile terminal. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly for moving purposes.
The system is used in the field of online safety monitoring of large-scale infrastructure structures such as bridges, tunnels, subways, foundation pits and tailings. The cloud data processing platform realizes data acquisition, storage, analysis and application, ensures that accurate data is stably acquired for a long time, and feeds back the health condition of the structure to a user in real time through calculation and analysis of the data. When the structure has an alarm, after the technical personnel confirm that the alarm information is real, the alarm information is sent to a user management unit at the first time, so that the occurrence of safety accidents is reduced, and the data of the structure serves the structure. If an emergency occurs, all personnel on the site can be informed at the first time through the alarm, and the short message can also be informed at the first time.
The utility model relates to a step is handled the cast-in-place support member of mounting surface strainometer, handles the back mounting surface strainometer and still includes:
marking the position of the surface strain gauge;
polishing the surface of the rod piece provided with the surface strain gauge, removing paint stains on the surface of the rod piece, and adhering the surface strain gauge and the rod piece;
and adjusting the position of the surface strain gauge to meet the measurement requirement, and respectively coating adhesive on the surfaces of the surface strain gauge and the rod piece, or fixedly arranging the surface strain gauge on the surface of the rod piece in a welding mode or a buckling mode. Thus, the fixation of the surface strain gauge is realized, and the monitoring requirement is met.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A cast-in-place support strain monitoring system, comprising: the system comprises a dynamic and static strain acquisition instrument, a surface strain meter, a cloud data processing platform, a wireless communication module and a remote control alarm;
the surface strain gauge is arranged on a rod piece of the cast-in-place support;
the surface strain gauge is in communication connection with the dynamic and static strain acquisition instrument, detects strain data of the rod piece and transmits the strain data to the dynamic and static strain acquisition instrument;
the dynamic and static strain acquisition instrument is in communication connection with the cloud data processing platform through the wireless communication module, the strain data are transmitted to the cloud data processing platform in a wireless communication mode, the cloud data processing platform analyzes, arranges and stores the strain data, and when the strain data exceed a threshold value, an alarm prompt is sent out through the remote control alarm;
monitoring personnel are connected with the cloud data processing platform through the terminal to acquire monitoring data information.
2. The cast-in-place bracket strain monitoring system of claim 1, further comprising: a plurality of spanning surfaces; each span surface is provided with a cast-in-place beam support, and a pier stud is connected between the span surface and the span surface;
the cast-in-place support supports the span surface, the cast-in-place beam and the pier stud respectively;
at least four surface strain gauges are arranged on a rod piece of a cast-in-place support which is supported at the pier column;
at least six surface strain gauges are mounted on a rod piece of a cast-in-place support supported at the cast-in-place beam, and the surface strain gauges are uniformly distributed along the transverse axis of the cast-in-place beam;
each span surface is provided with a plurality of cast-in-place beams, and at least two cast-in-place beam brackets of each span surface are provided with surface strain gauges.
3. The cast-in-place bracket strain monitoring system of claim 1,
the cloud data processing platform is provided with a plurality of communication channels, a data processing module and a data display module.
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| CN111089711A (en) * | 2019-11-25 | 2020-05-01 | 中铁十四局集团第一工程发展有限公司 | Cast-in-place support strain monitoring system and method |
| CN111089711B (en) * | 2019-11-25 | 2022-06-10 | 中铁十四局集团第一工程发展有限公司 | Cast-in-place support strain monitoring system and method |
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