CN105278421A - Monitoring system based on mobile phone - Google Patents

Monitoring system based on mobile phone Download PDF

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Publication number
CN105278421A
CN105278421A CN201510698814.1A CN201510698814A CN105278421A CN 105278421 A CN105278421 A CN 105278421A CN 201510698814 A CN201510698814 A CN 201510698814A CN 105278421 A CN105278421 A CN 105278421A
Authority
CN
China
Prior art keywords
haydite
mobile phone
prefabricated board
concrete prefabricated
tinsel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201510698814.1A
Other languages
Chinese (zh)
Other versions
CN105278421B (en
Inventor
林碧琴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Zicheng Engineering Management Co ltd
Original Assignee
Zhou Fei Electronic Science And Technology Co Ltd Of Nan'an Of Quanzhou City
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhou Fei Electronic Science And Technology Co Ltd Of Nan'an Of Quanzhou City filed Critical Zhou Fei Electronic Science And Technology Co Ltd Of Nan'an Of Quanzhou City
Priority to CN201611029919.9A priority Critical patent/CN106527314B/en
Priority to CN201510698814.1A priority patent/CN105278421B/en
Publication of CN105278421A publication Critical patent/CN105278421A/en
Application granted granted Critical
Publication of CN105278421B publication Critical patent/CN105278421B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/048Monitoring; Safety
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/44Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the purpose
    • E04C2/52Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the purpose with special adaptations for auxiliary purposes, e.g. serving for locating conduits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/72Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/72Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725Cordless telephones

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

The invention provides a monitoring system based on a mobile phone. The monitoring system comprises a processor, a radio frequency module, a server, a mobile phone and a square-shaped concrete precast panel. The processor is connected with the radio frequency module. A number of metal wires which run through both ends of the concrete precast panel are arranged in the concrete precast panel. One end of each metal wire is connected with the negative electrode of a power supply. The other end is connected with one end of a first resistor and an input end of an OR gate chip. The output end of the OR gate chip is connected with one end of a second resistor. The other end of each first resistor is connected with the other end of the second resistor and the positive electrode of the power supply. According to the invention, the processor reports the level state of a detection pin, so that a user can know whether the concrete precast panel has cracks; the user can monitor the state of the concrete precast panel in real time through the mobile phone, and take corresponding measures; and accidents caused by the concrete precast panel which continues to be used are avoided.

Description

A kind of supervisory system based on mobile phone
Technical field
The present invention relates to monitoring technique field, particularly relate to a kind of supervisory system based on mobile phone.
Background technology
Concrete prefabricated board has all multi-usages in engineering, as being used as floor or bridge etc., in use may there is the situation in crack in concrete prefabricated board, if in this case monitor not in time and continue to use, concrete prefabricated board then can be caused to rupture, finally may cause security incident.And existing xoncrete structure exists the lower situation of intensity, easily there is fracture and danger.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of supervisory system based on mobile phone, the problem that solution concrete prefabricated board crack may occur and cannot monitor in time.
The present invention is achieved in that a kind of supervisory system based on mobile phone, comprise processor, radio-frequency module, server, the concrete prefabricated board of mobile phone and square build, processor is connected with radio-frequency module, the tinsel that many run through concrete prefabricated board two ends is provided with in concrete prefabricated board, one termination power cathode of every one metal wire, one end of another termination first resistance and or an input end of door chip, or the output terminal of door chip is connected with one end of the second resistance, the other end of each first resistance is connected with the other end of the second resistance and positive source, processor is used for sending by radio-frequency module the level state detecting pin to server, server is used for sending to mobile phone the level state detecting pin.
Further, concrete prefabricated board is added water to build to solidify by raw materials and forms, and described raw materials comprises the material of following weight portion:
Cement: 30 ~ 50 parts, husky: 25 ~ 35 parts, flyash: 15 ~ 25 parts, haydite: 30 ~ 50 parts;
Wherein, the diameter of described haydite is 1 ~ 5cm;
Described haydite has the through hole holding tinsel and pass, and described tinsel through through hole, and connects plural haydite.
Tool of the present invention has the following advantages: reported the level state detecting pin by processor, namely can know whether concrete prefabricated board has crack, user can monitor the state of prefabricated board in real time by mobile phone, when there is slight crack, mobile phone can be seen detecting pin is high level, namely staff can know that crack occurs concrete prefabricated board, can carry out corresponding disposal, avoids continuing to use concrete prefabricated board to cause security incident.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one;
Fig. 2 is the schematic diagram wiry being connected with haydite in the embodiment of the present invention one;
Fig. 3 is the schematic diagram of the three-dimensional haydite net that in the embodiment of the present invention two, tinsel and haydite are worn;
Fig. 4 is installed with the tinsel of haydite and the connection diagram of template in the embodiment of the present invention three;
Fig. 5 is the position relationship schematic diagram of haydite keeper and tinsel and haydite in the embodiment of the present invention four;
Fig. 6 is the position relationship schematic diagram of haydite keeper and tinsel and haydite in the embodiment of the present invention four.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.
Embodiment one
A kind of supervisory system based on mobile phone, as shown in Figure 1, comprise processor, radio-frequency module, server, the concrete prefabricated board 5 of mobile phone and square build, processor is connected with radio-frequency module, the tinsel 2 that many run through concrete prefabricated board two ends is provided with in concrete prefabricated board, one termination power cathode of every one metal wire, one end of another termination first resistance R1 and or the input end of door chip U, or the output terminal of door chip is connected with one end of the second resistance R2, the other end of each first resistance is connected with the other end of the second resistance and positive source, processor is used for sending by radio-frequency module the level state detecting pin to server, server is used for sending to mobile phone the level state detecting pin.
The present invention in use, if there is crack in concrete prefabricated board, then tinsel can break, then have at least an one metal wire can be moved to high level by the positive voltage of the first resistance in one end of processor, high level will be exported with it with door chip, then detect pin place at processor and realize high level, the level state detecting pin is reported by processor, namely can know whether concrete prefabricated board has crack, user can monitor the state of prefabricated board in real time by mobile phone, when there is slight crack, mobile phone can be seen detecting pin is high level, namely staff can know that crack occurs concrete prefabricated board, corresponding disposal can be carried out, avoid continuing to use concrete prefabricated board to cause security incident.
In order to strengthen the intensity of concrete prefabricated board further, reduce security incident possibility occurrence, then invention proposes a kind of concrete prefabricated board of high strength, and concrete prefabricated board is added water to build to solidify by raw materials and forms, and described raw materials comprises the material of following weight portion:
Cement: 30 ~ 50 parts, husky: 25 ~ 35 parts, flyash: 15 ~ 25 parts, haydite: 30 ~ 50 parts;
Wherein, the diameter of described haydite is 1 ~ 5cm;
Described haydite has the through hole holding tinsel and pass, and described tinsel through through hole, and connects plural haydite.Tinsel in the present invention can have many, but the tinsel of more than at least should be had to be independently, is not connected with other tinsels and runs through prefabricated board two ends, in order to improve Detection results wiry, can spread coatings in painting wiry.Namely tinsel in the present invention may be used for the intensity of Concrete Structure, can detect again the crack of concrete prefabricated board, realizes multi-functional.
Fix on the metal filament to make haydite, at tinsel through after haydite through hole, had by string the tinsel of haydite to soak in a binder, in the present embodiment, cementing agent uses epoxy adhesive, in other embodiments, acrylate reactions tackifier etc. can also be adopted.Then the haydite on tinsel is adjusted to suitable position, wait cementing agent to solidify, haydite on the metal filament would not relative movement.
The described casting process be applied to based on the concrete prefabricated board in the supervisory system of mobile phone is: 20 weight portions that cement 30 weight portion, husky 35 weight portions and flyash 15 weight portion added water stir and obtain mixed slurry, part mixed slurry is first poured in concrete prefabricated board mold, after shakeouing, the described tinsel being connected with haydite is placed in uniformly the surface of mixed slurry in described mould, then remaining mixed slurry is poured in mould, enter operation of vibrating.Should be used for being of a size of 1200mm*1200mm based on the concrete prefabricated board in the supervisory system of mobile phone, but described in the size be applied to based on the concrete prefabricated board in the supervisory system of mobile phone can be arranged to other different specifications as required.For ensureing intensity wiry, the preferred diameter of described tinsel is the stainless steel wire of 0.5-3mm.
Test this and be applied to main performance based on the concrete prefabricated board in the supervisory system of mobile phone; test result is in table 1; as can be seen from Table 1; this is applied to not only has the advantages such as quality is light based on the concrete prefabricated board in the supervisory system of mobile phone, and its intensity is the haydite concrete structure of C30 apparently higher than rupture strength in prior art.By haydite concrete, concrete prefabricated board of the present invention can realize higher intensity, extends the serviceable life of concrete prefabricated board.
In order to absolutely prove in concrete prefabricated board the intensity adopting haydite concrete; the haydite concrete of emphasis to concrete prefabricated board is described by embodiment below of the present invention; processor in following examples, server, radio-frequency module etc. are identical with embodiment one; can direct reference example one, ensuing embodiment will no longer repeat circuit module.
Embodiment two
A kind ofly be applied to based on the concrete prefabricated board in the supervisory system of mobile phone, in the present embodiment, the structure be applied to based on the concrete prefabricated board in the supervisory system of mobile phone is similar to the structure be applied to based on the concrete prefabricated board in the supervisory system of mobile phone in embodiment one, all adopt tinsel haydite to be concatenated, ratio with it unlike the weight portion of concrete raw materials is different, in the present embodiment, described raw materials comprises the material of following weight portion:
Cement: 50 parts, husky: 25 parts, flyash: 25 parts, haydite 50 parts;
Wherein, the diameter of described haydite is 3 ~ 5cm.
The described casting process be applied to based on the concrete prefabricated board in the supervisory system of mobile phone is:
Prepare the raw materials of following weight portion: cement: 50 parts, husky: 25 parts, flyash: 25 parts, haydite 50 parts, gas-development agent 1 part;
Wherein, the diameter of described haydite is 3 ~ 5cm, and described haydite has three through holes holding tinsel and pass;
By the cement in described raw materials, husky, flyash, gas-development agent 15 weight portions that add water stir and make slurry, with tinsel 2 through the through hole 11 in haydite 1, haydite 1 are woven into three-dimensional haydite net, described three-dimensional haydite net as shown in Figure 3, owing to forming the restriction of tridimensional network, the position of haydite is also relatively fixing, also achieves the effect of fixing haydite;
Cast slurry, described three-dimensional haydite net is placed in slurry, and wherein, described three-dimensional haydite net more than at least three positions are connected to template, make three-dimensional haydite net can keep spatial structure when building slurry, and also can avoid haydite skewness in the slurry;
Carry out maintenance to solidify to slurry, form haydite concrete structure.
Should be used for being of a size of 2400mm*2400mm based on the concrete prefabricated board in the supervisory system of mobile phone, but described in the size be applied to based on the concrete prefabricated board in the supervisory system of mobile phone can be arranged to other different specifications as required.For ensureing intensity wiry, the preferred diameter of described tinsel is the stainless steel wire of 5mm.
Also be with embodiment one difference, in the present embodiment, described haydite has the staggered through hole of two or more, and haydite is connected into the haydite net of three-dimensional structure through described through hole by tinsel.
Test this and be applied to main performance based on the concrete prefabricated board in the supervisory system of mobile phone, test result is in table 1, as can be seen from Table 1, the structural strength of this lightweight strength concrete prefabricated board is obviously better than existing concrete prefabricated board, and a little more than the concrete prefabricated board in enforcement one.
Embodiment three
Be applied to based on the concrete prefabricated board in the supervisory system of mobile phone, described in be applied to be built by haydite concrete based on the concrete prefabricated board in the supervisory system of mobile phone and form, the raw materials of described haydite concrete comprises the material of following weight portion:
Cement: 40 parts, husky: 30 parts, flyash: 20 parts, haydite 40 parts;
Wherein, the diameter of described haydite is 1 ~ 3cm, and described xoncrete structure also comprises tinsel, and described haydite has the through hole holding tinsel and pass, and described tinsel through through hole, and connects plural haydite.
The described preparation process be applied to based on the concrete prefabricated board in the supervisory system of mobile phone is:
Prepare raw materials, described raw materials comprises the material of following weight portion: cement: 40 parts, husky: 30 parts, flyash: 20 parts, haydite 40 parts, gas-development agent 0.5 part;
By the cement in raw materials, husky, flyash, gas-development agent 25 weight portions that add water stir and make slurry, with tinsel through the through hole in haydite, are linked together by plural haydite, form plane haydite net;
There are tinsel 2 two ends of haydite 1 to be fixed on template 3 inside surface string, then pour into a mould slurry; Wherein, template 3 and tinsel 2 are with position relationship schematic diagram as shown in Figure 4; It should be noted that, the template 3 in accompanying drawing is as just signal, and the shape of non-limiting template 3, those skilled in the art can arrange different templates as required, and as the cylindrical or square bodily form, the diagram in the present invention is just to explanation.
Then carry out maintenance to solidify to slurry, form concrete prefabricated board.
Test this and be applied to main performance based on the concrete prefabricated board in the supervisory system of mobile phone, test result is in table 1, as can be seen from Table 1, the structural strength of this lightweight strength concrete prefabricated board is obviously better than existing concrete prefabricated board, and a little more than the concrete prefabricated board in enforcement one.
Embodiment four
Be applied to based on the concrete prefabricated board in the supervisory system of mobile phone, described in be applied to be built by haydite concrete based on the concrete prefabricated board in the supervisory system of mobile phone and form, the raw materials of described haydite concrete comprises the material of following weight portion:
Cement: 50 parts, husky: 25 parts, flyash: 15 parts, haydite 45 parts, gas-development agent 2 parts;
Wherein, the diameter of haydite 1 is 3 ~ 5cm, described haydite 1 is provided with the through hole having and hold tinsel and pass, described tinsel 2 is through through hole, and connect plural haydite, and on described tinsel 2, be also provided with haydite keeper 4, the diameter of section of described haydite keeper 4 is greater than the internal diameter of haydite through hole, described haydite keeper 4 is movably fastened the two ends of haydite 1 on tinsel 2, or be provided with described haydite keeper 4 between every two adjacent two haydites 1, the position relationship of described haydite keeper and tinsel and haydite as shown in Figure 5 and Figure 6.Described haydite keeper can effectively prevent haydite from moving on the metal filament, thus haydite is more evenly distributed in concrete.
In embodiment, mould inner wall is provided with hook formation for fixing metal silk or set collar, cast slurry before by go here and there have the tinsel two ends of haydite to be individually fixed in mould inner wall hook formation or set collar on, then slurry is poured into a mould, the haydite that such tinsel connects just is placed in slurry, and position is relatively fixing, not easily move.Use the tinsel fixed form of such scheme, according to design needs, the position of haydite in haydite concrete structure can be controlled flexibly, exactly, and arrange conveniently.When tinsel is iron wire, stainless steel wire or copper wire, and when diameter wiry is 0.5-2mm, existing flexibility necessarily, is convenient to bending, difficult drop-off again, is conveniently wound around or on the hook formation that is bound in mould inner wall or set collar.
In certain embodiments, the density of haydite distribution is middle close along haydite concrete structural thickness directional spreding density, and both sides are dredged.The intensity of haydite concrete structure can be strengthened like this.
The described preparation process be applied to based on the concrete prefabricated board in the supervisory system of mobile phone is as follows:
Prepare raw materials, described raw materials comprises the material of following weight portion:
Cement: 50 parts, husky: 25 parts, flyash: 15 parts, haydite 45 parts, gas-development agent 2 parts;
By the cement in raw materials, husky, flyash, gas-development agent 20 weight portions that add water stir and make slurry, with tinsel through the through hole in haydite, described haydite is joined together to form haydite line, and described haydite keeper is sticked on described tinsel, wherein, haydite keeper is arranged between two haydites;
In template, arrange the tinsel (i.e. haydite line) that many strings have haydite, wherein two ends wiry are fixed on template inside surface; Then slurry is poured into a mould;
Carry out maintenance to solidify to slurry, form concrete prefabricated board.
Test this and be applied to main performance based on the concrete prefabricated board in the supervisory system of mobile phone, test result is in table 1, as can be seen from Table 1, the structural strength of this lightweight strength concrete prefabricated board is obviously better than existing concrete prefabricated board, and a little more than the concrete prefabricated board in enforcement one.
Table 1 is the performance parameter of concrete prefabricated board in embodiments of the invention;
Table 1
The foregoing is only embodiments of the invention; not thereby scope of patent protection of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (2)

1. the supervisory system based on mobile phone, it is characterized in that: comprise processor, radio-frequency module, server, the concrete prefabricated board of mobile phone and square build, processor is connected with radio-frequency module, the tinsel that many run through concrete prefabricated board two ends is provided with in concrete prefabricated board, one termination power cathode of every one metal wire, one end of another termination first resistance and or an input end of door chip, or the output terminal of door chip is connected with one end of the second resistance, the other end of each first resistance is connected with the other end of the second resistance and positive source, processor is used for sending by radio-frequency module the level state detecting pin to server, server is used for sending to mobile phone the level state detecting pin.
2. a kind of supervisory system based on mobile phone according to claim 1, is characterized in that: concrete prefabricated board is added water to build to solidify by raw materials and forms, and described raw materials comprises the material of following weight portion:
Cement: 30 ~ 50 parts, husky: 25 ~ 35 parts, flyash: 15 ~ 25 parts, haydite: 30 ~ 50 parts;
Wherein, the diameter of described haydite is 1 ~ 5cm;
Described haydite has the through hole holding tinsel and pass, and described tinsel through through hole, and connects plural haydite.
CN201510698814.1A 2015-10-25 2015-10-25 A kind of monitoring system based on mobile phone Expired - Fee Related CN105278421B (en)

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CN201611029919.9A CN106527314B (en) 2015-10-25 2015-10-25 A kind of system monitored in real time on mobile phone
CN201510698814.1A CN105278421B (en) 2015-10-25 2015-10-25 A kind of monitoring system based on mobile phone

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Publication number Priority date Publication date Assignee Title
CN111253099B (en) * 2018-11-30 2024-10-01 中衡卓创国际工程设计有限公司 Special-shaped ceramsite, concrete and prefabricated member thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10307117A (en) * 1997-05-06 1998-11-17 Mitsubishi Heavy Ind Ltd Crack measuring device
CN2773705Y (en) * 2005-03-22 2006-04-19 刘天舒 Antenna connecting line inspector
CN101299032A (en) * 2008-06-06 2008-11-05 重庆交通大学 Structural crack bionic monitoring system and monitoring method thereof
CN101866526A (en) * 2010-04-27 2010-10-20 中国科学院武汉岩土力学研究所 Method and device for traffic alarming after bridge collapse
CN101963591A (en) * 2010-08-13 2011-02-02 上海市建筑科学研究院(集团)有限公司 Detection and evaluation method of crack condition on external insulating layer of thin-plastered outer wall
CN102678179A (en) * 2012-05-11 2012-09-19 中国十七冶集团有限公司 Safety early warning method for deformation and sinking of tunnel vault
CN102964102A (en) * 2012-11-06 2013-03-13 张息清 Ceramsite concrete slab
CN202887402U (en) * 2012-10-14 2013-04-17 肖兰 Wireless gas alarm device
CN103399049A (en) * 2013-07-22 2013-11-20 山东大学 Concrete cracking monitoring method based on tensile sensitive effect of conductive polymer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10307117A (en) * 1997-05-06 1998-11-17 Mitsubishi Heavy Ind Ltd Crack measuring device
CN2773705Y (en) * 2005-03-22 2006-04-19 刘天舒 Antenna connecting line inspector
CN101299032A (en) * 2008-06-06 2008-11-05 重庆交通大学 Structural crack bionic monitoring system and monitoring method thereof
CN101866526A (en) * 2010-04-27 2010-10-20 中国科学院武汉岩土力学研究所 Method and device for traffic alarming after bridge collapse
CN101963591A (en) * 2010-08-13 2011-02-02 上海市建筑科学研究院(集团)有限公司 Detection and evaluation method of crack condition on external insulating layer of thin-plastered outer wall
CN102678179A (en) * 2012-05-11 2012-09-19 中国十七冶集团有限公司 Safety early warning method for deformation and sinking of tunnel vault
CN202887402U (en) * 2012-10-14 2013-04-17 肖兰 Wireless gas alarm device
CN102964102A (en) * 2012-11-06 2013-03-13 张息清 Ceramsite concrete slab
CN103399049A (en) * 2013-07-22 2013-11-20 山东大学 Concrete cracking monitoring method based on tensile sensitive effect of conductive polymer

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CN106527314A (en) 2017-03-22
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