CN109186447A - Distress in concrete detection system and method based on 3D printing and wireless sensing - Google Patents
Distress in concrete detection system and method based on 3D printing and wireless sensing Download PDFInfo
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- CN109186447A CN109186447A CN201811359289.0A CN201811359289A CN109186447A CN 109186447 A CN109186447 A CN 109186447A CN 201811359289 A CN201811359289 A CN 201811359289A CN 109186447 A CN109186447 A CN 109186447A
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- concrete
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The distress in concrete detection system based on 3D printing and wireless sensing that the present invention provides a kind of; protection shell including the multiple 3D printings being rotatably coupled by steel hinge; the two halves section of Flex bending sensor is respectively arranged in two adjacent protection shells; two protection shell levels at outermost both ends are set on concrete, and intermediate each protection shell tilts in line to be set on concrete；Each Flex bending sensor passes through connection cable connection GPRS acquisition system, and GPRS acquisition system is wirelessly connected wireless signal collection terminal.The present invention also provides the distress in concrete detection methods based on 3D printing and wireless sensing.The present invention can in real time, accurately, easily detect distress in concrete and cracking degree, realize at a distance to the monitoring of distress in concrete, have the advantages that monitoring result is accurate, monitors year limit for length, is easy to implement, concrete destruction can be effectively controlled.
Description
Technical field
The present invention relates to a kind of distress in concrete detection system and method based on 3D printing Yu wireless Flex sensing technology,
It is mainly used in civil engineering the measurement to concrete or other structure member crevices, belongs to crooked sensory technology and is supervised in structural health
The application in survey field.
Background technique
Distress in concrete is a problem deserving of attention in engineering, and microcosmic distress in concrete once develops, Ke Nengyin
The cracking of works is played, deformation is even destroyed, therefore, is particularly important to the monitoring of distress in concrete.
Currently, the monitoring about distress in concrete mainly has following method: patent CN105403161A provides one
The method that kind detects concrete structure crack width using fibre optical sensor, including concrete crack width calculation method, pass through
It slots in concrete structure laying optical fiber, using the strain stress relation of crack variation and concrete, proposes the meter of distress in concrete
Calculation method, this method computational accuracy is higher, but laying optical fiber sensor of slotting in concrete structure need certain human and material resources,
It is complex；Patent CN106839958A provides a kind of easy distress in concrete monitoring and measuring equipment and method, mixed
Several pure thin copper wires are arranged in Xtah Crude Clay structure crack developing region, and are tightly attached to piece alloy wire of every pure thin copper wire arranged alongside,
A circuit is formed by conducting wire and data collecting instrument, when concrete generates crack, strain changes, then can be supervised
It surveys, the inventive structure is simple, and it is easy to make, but measurement data is not accurate enough.
3D printing technique is a kind of new technique by current material printing rapid shaping.By three-dimensional modeling, quickly beat
It is printed as type.It is one kind based on mathematical model, by the technology of the layer-by-layer printing shaping of the materials such as metal, plastics, rubber.3D is beaten
Print technology is widely used in the fields such as industrial design, package design, jewel design, medical industries, automobile engineering, civil engineering.
Currently, 3D printing is suitable for some lesser, high-end productions, 3D printing technique is since it is simple and convenient, printing speed
Molding technology is widely used.
Flex bending sensor is a kind of resistance sensor of the surface with one layer of special resistance material.Flex bending passes
Sensor is widely used in the fields such as robot, medical treatment, building.Compared with other sensors, it have it is small and exquisite, conveniently, precision
High advantage.When Flex bending sensor is occured bending and deformation by stress, sheet resistance value can change, when by Flex
Bending sensor according to the result of calibration experiment for that can obtain monitoring the numerical value of physical quantity when monitoring.Flex crooked sensory
Affected by environment smaller after device encapsulation, service life is longer.
Bluetooth technology is a kind of wireless technology, it can be achieved that short range data transmission between fixed equipment, mobile device.It is blue
Tooth technology is applied to the multiple fields such as electronics, computer, telecommunications.Bluetooth technology has the agreement of client/server, and a main equipment can
At most it is connected with 7 from equipment.
GPRS wireless technology is the abbreviation for being grouped wireless service technology, it is a kind of shifting that mobile phone user can be used
Dynamic data service。GPRS is continuously different in the mode of channel transmission with other, is transmitted with package formula, taking when transmitted
With being calculated with the unit of its transmission, its entire channel is not used, it is relatively reasonable cheap.The transmission rate of GPRS is also than in the past
It is promoted.GPRS wireless technology is the technology between 2G and 3G, also referred to as 2.5G.If by the technology and bluetooth without
Line technology is used for together in the monitoring to distress in concrete, can be monitored the acquisition of data to it all the time, whenever and wherever possible.
Compared with the traditional way, GPRS technical transmission rate is higher and connection charge is lower.
Therefore, this invention address that the technologies such as 3D printing, Flex bending sensor, bluetooth, GPRS are combined, one is provided
The system and method that kind can facilitate, accurately be detected to distress in concrete.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind can in real time, accurately, easily detect distress in concrete and
The system and method for cracking degree.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide a kind of based on 3D printing and wireless sensing
Distress in concrete detection system, it is characterised in that: the protection shell including cutting with scissors the multiple 3D printings being rotatably coupled by steel,
The two halves section of Flex bending sensor is respectively arranged in two adjacent protection shells, two protection shell water at outermost both ends
Flat to be set on concrete, intermediate each protection shell tilts in line to be set on concrete；Each Flex bending sensor is logical
Connection cable connection GPRS acquisition system is crossed, GPRS acquisition system is wirelessly connected wireless signal collection terminal.
Preferably, the protection shell is formed by PLA material by 3D printing.
Preferably, the GPRS acquisition system is wirelessly connected wireless signal collection terminal by bluetooth module.
The distress in concrete detection method based on 3D printing and wireless sensing that the present invention also provides a kind of, feature exist
In using the above-mentioned distress in concrete detection system based on 3D printing and wireless sensing, step are as follows:
Step 1: n being fixed on concrete by the packaged Flex bending sensor of protection shell, the two of both ends
A protection shell is horizontally disposed, and intermediate each protection shell is obliquely installed in line, and n is positive integer；
Step 2: all Flex bending sensors being connected to GPRS acquisition system by connecting cable, check wireless signal
Collection terminal communicates intact with GPRS acquisition system；
Step 3: carrying out the calibration experiment of Flex bending sensor, obtain the registration variation and angle of Flex bending sensor
The relationship of variation；
Step 4: starting to detect, the registration of Flex bending sensor is sent to wireless signal by GPRS acquisition system and collects
Terminal, the relationship of registration variation and angle change that wireless signal collection terminal is obtained according to step 3, the Flex of actual measurement is bent
The registration variation of sensor is scaled angle change value, and calculates concrete cracking value, to realize to distress in concrete
Detection.
Preferably, the detailed process of the step 3 are as follows: Flex bending sensor is bent into different angle, and records biography
Sensor registration draws bending angle variation with sensor registration and changes figure, and the two has linear relationship, so that it is curved to obtain Flex
Linear relationship between the registration variation △ C and bending angle variation θ of bent sensor meets: θ=△ C/K, K are slope.
Preferably, in the step 4, the circular of distress in concrete are as follows:
Record the initial registration C of Flex bending sensor1, when concrete splits, Flex bending sensor is by corresponding
Bending, records Flex bending sensor registration C at this time2, the variation of Flex bending sensor registration is △ C=C2-C1, then can obtain
Bending angle to Flex bending sensor changes θ=△ C/K；
Then concrete cracking value △ S=Ltan θ, L are the length of Flex bending sensor；
It can thus be concluded that concrete adds up cracking value S=Ltan θ1+Ltanθ2+…+Ltanθn, θiIt is passed for i-th of Flex bending
The bending angle of sensor changes, and n is the number of Flex bending sensor, 1≤i≤n.
System provided by the invention overcomes the deficiencies in the prior art, can in real time, accurately, easily detect coagulation soil cracking
Seam and cracking degree, Flex bending sensor have the characteristics that small in size, high sensitivity；3D printing has rapid shaping, simple
Convenient feature encapsulates the protection shell of 3D printing, so that Flex bending sensor is not corroded on Flex bending sensor
Equal environment influence, and prolong its service life；The monitoring to distress in concrete at a distance may be implemented in GPRS acquisition system, has prison
Survey result is accurate, monitors year limit for length, advantage easy to implement, and concrete destruction can be effectively controlled.
Detailed description of the invention
Fig. 1 is the distress in concrete detecting system schematic diagram provided in this embodiment based on 3D printing and wireless sensing；
Fig. 2 is the single Flex bending sensor schematic diagram when concrete cracking；
Fig. 3 is Flex bending sensor encapsulation schematic diagram；
Fig. 4 is Flex bending sensor schematic diagram；
Description of symbols: 1-concrete sample, 2-micro cracks, the protection materials of 3-3D printings, 4-steel hinge,
5-Flex bending sensors, 6-connection cables, 7-GPRS acquisition systems, 8-wireless signal collection terminals.
Specific embodiment
Present invention will be further explained below with reference to specific examples.
Fig. 1 is the distress in concrete detecting system schematic diagram provided in this embodiment based on 3D printing and wireless sensing, institute
The distress in concrete detection system based on 3D printing and wireless sensing stated includes the protection shell 3 of 3D printing, steel hinge 4, Flex
Bending sensor 5, connection cable 6, GPRS acquisition system 7 and wireless signal collection terminal 8 etc..
In conjunction with FIG. 1 to FIG. 3,5 half of Flex bending sensor is placed in 3 one end of protection shell, and Flex bending passes
The other half is placed in another protection 3 one end of shell sensor 6, and two adjacent protection shells 3 make phase by 4 connection of steel hinge
It can be rotated upwardly and downwardly between adjacent two protection shells 3, as shown in Figures 2 and 3.The both ends of i.e. each protection shell 3 are respectively equipped with
The half of Flex bending sensor 5.In this way, several Flex bending sensors 5 are encapsulated, two Flex bending at both ends
The free end of sensor 5 also is provided with steel hinge 4.
As shown in Figure 1, keeping two protection shells 3 of upper/lower terminal horizontally disposed, intermediate each protection shell 3 is at always
Line is obliquely installed.Even if the steel at two protection 3 both ends of shell of upper/lower terminal cuts with scissors 4 levels and is fixed on concrete sample 1, and
Adopt the surface that intermediate each protection shell 3 is fixed on to concrete sample 1 in the method for paste.
Each Flex bending sensor 5 is connected into GPRS acquisition system 7 by connection cable 6, GPRS acquisition system 7 passes through
Data wireless transmission is entered wireless signal collection terminal 8 by bluetooth module.Wireless signal collection terminal 8 receives data, works as coagulation
When local products life crack, resistance variations cause 5 registration of Flex bending sensor to change, and the relationship as obtained by calibration obtains bending angle
Degree, and calculate concrete sample cracking degree.
Wherein, protection shell 3 is formed by PLA material by 3D printing.
GPRS acquisition system 7 has lithium battery and bluetooth transceiver therein.
Implementation method of the invention is as follows:
Step 1:
Calibration experiment is carried out to Flex bending sensor 5 first.Flex bending sensor 5 is bent to different angles,
And signal is received by wireless signal collection terminal 8, record the variation of 5 registration of Flex bending sensor.Flex bending sensor
Registration variation meets linear relationship with bending angle variation, thus obtains Flex bending sensor registration variation △ D and bending angle
Linear relationship between degree variation θ, θ=△ D/K, and acquire slope K.
Step 2:
Carry out modelling.PLA material is placed on printing protection shell 3 in 3D printer, and pre- at half
It boxes out gap, Flex bending sensor 5 is put into wherein, and plus the other end of steel hinge 4, Flex bending sensor 5 also with printing
Good protection shell 3 is packaged, and sequence is by n Flex bending sensor 5, protection shell 3, the N+2 of N+1 3D printing according to this
A 4 link of steel hinge constitutes whole.
Step 3:
The steel hinge level of the upper and lower ends of Flex bending sensor model is fixed on concrete sample 1, and using viscous
Flex bending sensor model is fixed on the surface of concrete sample 1 by the mode of patch, as shown in Figure 1.N number of Flex is bent and is passed
The connection cable 6 of sensor is connected, and accesses GPRS signal acquiring system 7, will by bluetooth module by GPRS signal acquiring system 7
Data wireless transmission enters wireless signal collection terminal 8.
Step 4:
Data are received by wireless signal collection terminal 8, when concrete cracking, sensor registration can be changed over time,
Bending angle can be obtained according to calibration experiment acquired results, and calculates Flex bending sensor shift value, thus carries out concrete
Crack Monitoring.It is specific to calculate are as follows: the record initial registration D of Flex sensor1, when concrete generates crack, Flex crooked sensory
Device bending, records registration D2, the variation of Flex bending sensor registration is △ D=D2-D1, it is bent the bending of sensor accordingly
Angle change value θ=△ D/K.In conjunction with Fig. 4, and calculate the shift value △ S=Ltan θ of Flex bending sensor.Thus calculating side
Fa Ke get adds up cracking value are as follows: S=Ltan θ1+Ltanθ2+…+Ltanθn, n is the number of Flex bending sensor.
Calculation formula is summarized as follows:
△ D=D2-D1
θ=△ D/K
Tan θ=△ S/L
△ S=Ltan θ
S=Ltan θ1+Ltanθ2+…+Ltanθn
In formula, L is the length for protecting shell 3；△ D is Flex bending sensor registration changing value；θiWhen for crack occurs
I-th each Flex bending sensor bending angle variation, 1≤i≤n；△ S is Flex bending sensor shift value, as coagulation
Native cracking value；S is Flex bending sensor accumulative displacement numerical value, i.e. concrete adds up cracking value.
The above, only presently preferred embodiments of the present invention, not to the present invention in any form with substantial limitation,
It should be pointed out that under the premise of not departing from the method for the present invention, can also be made for those skilled in the art
Several improvement and supplement, these are improved and supplement also should be regarded as protection scope of the present invention.All those skilled in the art,
Without departing from the spirit and scope of the present invention, when made using disclosed above technology contents it is a little more
Dynamic, modification and the equivalent variations developed, are equivalent embodiment of the invention；Meanwhile all substantial technologicals pair according to the present invention
The variation, modification and evolution of any equivalent variations made by above-described embodiment, still fall within the range of technical solution of the present invention
It is interior.
Claims (6)
1. a kind of distress in concrete detection system based on 3D printing and wireless sensing, it is characterised in that: including cutting with scissors (4) by steel
The protection shell (3) for the multiple 3D printings being rotatably coupled, the two halves section of Flex bending sensor (5) are respectively arranged on adjacent
In two protection shells (3), two protection shells (3) at outermost both ends are horizontal to be set on concrete, and intermediate each protection is outer
Shell (3) tilts in line to be set on concrete；Each Flex bending sensor (5) connects GPRS by connection cable (6) and adopts
Collecting system (7), GPRS acquisition system (7) are wirelessly connected wireless signal collection terminal (8).
2. a kind of distress in concrete detection system based on 3D printing and wireless sensing as described in claim 1, feature exist
In: the protection shell (3) is formed by PLA material by 3D printing.
3. a kind of distress in concrete detection system based on 3D printing and wireless sensing as described in claim 1, feature exist
In: the GPRS acquisition system (7) is wirelessly connected wireless signal collection terminal (8) by bluetooth module.
4. a kind of distress in concrete detection method based on 3D printing and wireless sensing, which is characterized in that using such as claim 1
~3 described in any item distress in concrete detection systems based on 3D printing and wireless sensing, step are as follows:
Step 1: n are fixed on concrete by the packaged Flex bending sensor (5) of protection shell (3), both ends
Two protection shells (3) are horizontally disposed, and intermediate each protection shell (3) is obliquely installed in line, and n is positive integer；
Step 2: all Flex bending sensors (5) being connected to GPRS acquisition system (7) by connecting cable (6), check nothing
Line signal collection terminal (8) communicates intact with GPRS acquisition system (7)；
Step 3: carrying out the calibration experiment of Flex bending sensor (5), obtain registration variation and the angle of Flex bending sensor (5)
Spend the relationship of variation；
Step 4: starting to detect, the registration of Flex bending sensor (5) is sent to wireless signal receipts by GPRS acquisition system (7)
Collect terminal (8), the relationship of registration variation and angle change that wireless signal collection terminal (8) is obtained according to step 3, by actual measurement
The registration variation of Flex bending sensor (5) is scaled angle change value, and calculates concrete cracking value, to realize to mixed
The detection of solidifying soil cracking seam.
5. a kind of distress in concrete detection method based on 3D printing and wireless sensing as claimed in claim 4, feature exist
In: the detailed process of the step 3 are as follows: Flex bending sensor (5) is bent into different angle, and records sensor registration,
It draws bending angle variation and changes figure with sensor registration, the two has linear relationship, to obtain Flex bending sensor
(5) the linear relationship between registration variation △ C and bending angle variation θ meets: θ=△ C/K, K are slope.
6. a kind of distress in concrete detection method based on 3D printing and wireless sensing as claimed in claim 5, feature exist
In: in the step 4, the circular of distress in concrete are as follows:
Record the initial registration C of Flex bending sensor1, when concrete splits, Flex bending sensor is bent accordingly,
The Flex bending sensor registration C of record at this time2, the variation of Flex bending sensor registration is △ C=C2-C1, then Flex can be obtained
The bending angle of bending sensor changes θ=△ C/K；
Then concrete cracking value △ S=Ltan θ, L are the length of Flex bending sensor；
It can thus be concluded that concrete adds up cracking value S=Ltan θ1+Ltanθ2+…+Ltanθn, θiFor i-th of Flex bending sensor
Bending angle variation, n be Flex bending sensor number, 1≤i≤n.
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Cited By (3)
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| CN111141255A (en) * | 2020-01-03 | 2020-05-12 | 上海大学 | Sedimentation and slope displacement monitoring system and method based on FLEX sensor |
| CN111456718A (en) * | 2020-04-03 | 2020-07-28 | 上海大学 | Optical fiber wireless inclinometer based on FDM technology |
| CN112213205A (en) * | 2020-10-13 | 2021-01-12 | 上海建工建材科技集团股份有限公司 | Method for testing bending property and extension property of 3D printing cement-based material |
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