CN108132263A - Across the hole radar detection device of diaphram wall internal flaw and method - Google Patents
Across the hole radar detection device of diaphram wall internal flaw and method Download PDFInfo
- Publication number
- CN108132263A CN108132263A CN201711324173.9A CN201711324173A CN108132263A CN 108132263 A CN108132263 A CN 108132263A CN 201711324173 A CN201711324173 A CN 201711324173A CN 108132263 A CN108132263 A CN 108132263A
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- CN
- China
- Prior art keywords
- antenna
- pvc pipe
- diaphram wall
- transmitting antenna
- reception antenna
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
Abstract
The present invention relates to underground engineering detection fields, disclose across the hole radar detection device and method of a kind of diaphram wall internal flaw.The invention vertically pre-buried test tube in diaphram wall, across hole radar method is used during detection, transmitting antenna and reception antenna are respectively placed in adjacent test tube, different location transmitting and reception frequency electromagnetic waves in test tube, since the dielectric constant and conductivity of rejected region are apparently higher than complete concrete structure, when electromagnetic wave is by the defects of diaphram wall region, its velocity of wave, amplitude and waveform can all change, therefore can be judged in diaphram wall with the presence or absence of the position of defect and defect by analyzing the form of electromagnetic wave, the information such as size and shape.
Description
Technical field
The present invention relates to underground engineering detection field, more particularly to a kind of across hole detections of radar of diaphram wall internal flaw
Device and method.
Background technology
Ground is usually located all kinds of building structure and arterial traffic around the deep big foundation pit in dense urban centers area,
Then gather various underground utilities and subway tunnel etc. for underground so that foundation pit surrounding enviroment complicated condition wants deformation control of foundation pit
Ask high；And base pit engineering then usually faces in itself that place is nervous, the duration is tight, complex geologic conditions, difficulty of construction are big, environmental protection
It is required that high challenge.Under these conditions, diaphram wall combination inner support system is the common building enclosure pattern with maturation
One of, usually have many advantages, such as that big rigidity, good integrity, safe, retaining wall deformation is smaller, impermeability is strong, becomes
Ensure the crucial carrier of underground engineering safety and Environmental security.
However, ultra-deep underground continuous wall complex structural designs, working procedure are complicated, along with geological condition is changeable etc. many
Unpredictalbe unfavorable factor will largely influence the entity quality of underground continuous wall-enclosure structure, lead to structure
There is the defects of folder mud, cavity, wall body slit, joint cracking and slot bottom sediment, make building enclosure in Excavation Process
There is percolating water, quicksand, water sudden soil flooding, foundation pit in cracking, even generation foundation pit is supported to collapse equivalent risk event, seriously affect
It foundation pit safety in itself and periphery subway, tunnel, underground utilities and builds（Structure）The safety of the surrounding enviroment such as object is built, is caused huge
Economic loss.
Therefore, it is necessary to be detected before excavation of foundation pit to the defects of diaphram wall, so as to a definite target in view into
Row structural strengthening and Risk Pre-control, the generation of the sexual behavior that averts a calamity event.But it from the point of view of existing achievement in research, has no at present
The method of mature and reliable carries out diaphram wall quality testing and assessment before excavation of foundation pit, and existing detection method is mostly
The method for continuing to use engineering geophysics（Such as resistivity method）Or use for reference the relevant technologies of pile measurement（Such as core drilling method, low strain dynamic method, sound
Wave transmission beam method etc.）, it is lack of pertinence, detection result can not ensure.
Invention content
It is an object of the invention to be directed to diaphram wall crack that may be present, cavity, folder mud, connector in construction to open
It splits and the defects of slot bottom sediment, a kind of across the hole radar detection device of diaphram wall internal flaw and method is provided.This technology
It can be saturating using electromagnetic wave by test tube pre-buried in diaphram wall before excavation of foundation pit after construction of diaphragm wall completion
Penetrate principle, can effectively detect within the walls there may be the defects of.
The present invention is existing across hole radar method in the new application of underground engineering detection field.Across hole radar can detect
The condition of disease is that the electrical parameter of rejected region and complete structure has notable difference.The basic function of diaphram wall is earth-retaining
With blocking water, after defect occurs, rejected region often becomes the channel of seepage action of ground water, relative to preferable water impermeability
For the concrete structure of energy, the water content of rejected region can significantly increase.Water is that opposite dielectric is normal in nature electromagnetic medium
The highest substance of number, value is up to 81, and the relative dielectric constant of underground concrete structure is usually 6 ~ 20.When structure somewhere
During water content increase, the relative dielectric constant at the position can significantly increase, and dielectric constant can influence electromagnetic wave and be tied in underground
Therefore propagation in structure, can carry out transmission measurement, by inferring inside configuration with respect to dielectric by across hole radar to underground structure
The distribution situation being distributed to judge fault of construction of constant.
Across the hole radar detection device of diaphram wall internal flaw proposed by the present invention, the detection device connect for underground
Continuous wall wall, in the steel reinforcement cage process of binding of the diaphram wall wall, pvc pipe is along diaphram wall depth direction
It is fixed on steel reinforcement cage；Several pvc pipes are respectively arranged at the interior thickness of diaphram wall wall, and connect along underground
The elongated arrangement of depth direction of continuous wall wall；Wherein：Including across hole radar system and antenna lifting mechanism；The antenna elevator
Structure is by several tripods, several are oriented to ranging pulley and several reels form, and each tripot is set on PVC
Tube top portion, equipped with ranging pulley is oriented on each tripod, each ranging pulley that is oriented to corresponds to a reel；Adjacent two
Between pvc pipe, transmitting antenna on a pvc pipe is set, reception antenna, a cable are set on another pvc pipe
One end is connect with transmitting antenna, and the cable other end is oriented to ranging pulley via one and is wound on a reel, and from the spiral
Wheel picks out, and is connected with the emission port of radar host computer；Equally, reception antenna, another cable are set on another pvc pipe
One end is connect with reception antenna, and another cable other end is wound on via another guiding ranging pulley on another reel,
And picked out from the reel, it is connected with the receiving port of radar host computer；The reel is driven by motor, it can be achieved that emitting day
Line and reception antenna are either synchronously or asynchronously transferred or are promoted, and the tripod and guiding ranging pulley are used for transmitting antenna or reception
Antenna is positioned, be oriented to ranging pulley can to the position of transmitting antenna or reception antenna in pvc pipe is surveyed and decentralization or
The height of promotion measures.
In the present invention, the radar system working frequency is 200 ~ 500MHz.
In the present invention, a diameter of 70mm of the pvc pipe, the tube spacing of adjacent pvc pipe is 1 ~ 2m.
In the present invention, the transmitting antenna or reception antenna moving step pitch may be configured as 5cm or 10cm, accurately be measured
Range can be chosen to be and tentatively judge in the range of the 1m up and down of depth residing for defect, depth residing for reception antenna or transmitting antenna and
Distance is transferred to be measured by guiding ranging pulley.
In the present invention, one transmitting antenna corresponds to one or several reception antennas.
Diaphram wall internal flaw proposed by the present invention across hole radar detection device detection method, including following step
Suddenly：
（1）In the steel reinforcement cage process of binding of diaphram wall wall, pvc pipe is fixed on steel reinforcement cage, pvc pipe should
It is arranged at diaphram wall body interior thickness, and along the elongated arrangement of diaphram wall depth direction；
（2）After the completion of diaphram wall wall pours, pvc pipe physical location is recorded, to pvc pipe effective depth
It is checked, pvc pipe is dredged when necessary；
（3）Tripod is set up respectively above adjacent two pvc pipe, and corresponding installation is oriented to ranging pulley；
（4）Will across hole transmitting radar antenna and reception antenna by cable, be oriented to ranging pulley and reel connects via corresponding
Radar host computer is connected to, adjusting corresponding reel makes transmitting antenna and reception antenna be located at aperture and in same depth；
（5）Carry out preliminary surveying.Since aperture, synchronous transmitting antenna and the reception antenna of transferring is to test tube bottom, decentralization process
In at interval of setting step pitch acquisition primary radar data, obtained after being measured by data analysis with the presence or absence of defect and defect
Approximate depth；
（6）Accurately measured.In step（5）It is judged as that in a certain range, transmitting antenna is consolidated up and down for possible defective locations
At the top of the range, reception antenna is transferred since depth bounds top, and often decentralization setting step pitch acquires a data, directly
Selected depth bounds bottom is reached to reception antenna；Then transmitting antenna is transferred into setting step pitch and fixation, reception antenna weight
Multiple aforesaid operations, until transmitting antenna is transferred to selected depth bounds bottom；It must be fallen vacant by data analysis after being measured
Sunken specific location, size and shape.
The present invention is further characterized in that：
Across the hole radar operating frequency ranging from 200 ~ 500MHz, test tube are the pvc pipe of diameter 70mm, and adjacent test tube spacing is
1 ~ 2m, antenna moving step pitch may be configured as 5cm or 10cm, and the range accurately measured, which can be chosen to be, tentatively to be judged residing for defect
In the range of the 1m up and down of depth, depth residing for antenna and decentralization distance are measured by guiding ranging pulley.
The present invention vertically pre-buried test tube in diaphram wall using across hole radar method during detection, will emit
Antenna and reception antenna are respectively placed in adjacent test tube, different location transmitting and reception frequency electromagnetic waves in test tube, by
Complete concrete structure is apparently higher than in the dielectric constant and conductivity of rejected region, when electromagnetic wave is by diaphram wall
The defects of region when, velocity of wave, amplitude and waveform can all change, therefore can judge ground by analyzing the form of electromagnetic wave
With the presence or absence of information such as position, the size and shapes of defect and defect in lower diaphragm wall.
Description of the drawings
Fig. 1 is the principle schematic that across hole radar method detects diaphram wall defect；
Fig. 2 is preliminary surveying schematic diagram；
Fig. 3 is accurate instrumentation plan；
Figure label：1. diaphram wall wall, 2.PVC pipes, 3. tripods, 4. are oriented to ranging pulley, 5. reels, 6. transmittings
Antenna, 7. reception antennas, 8. cables, 9. radar host computers, 10. defects.
Specific embodiment
It combines and further illustrates the present invention below by embodiment.
Embodiment 1：Referring to Fig. 1.It is in the steel reinforcement cage process of binding of diaphram wall body 1, pvc pipe 2 is continuous along underground
Wall depth direction is fixed on steel reinforcement cage, and pvc pipe 2 should be arranged at the interior thickness of diaphram wall body 1, and connect along underground
The depth direction elongated arrangement of continuous wall 1 in 2 tube top of pvc pipe and tube bottom capping protection during installation, prevents from blocking.Underground is continuous
After the completion of wall 1 pours, 2 physical location of pvc pipe is recorded, 2 effective depth of pvc pipe is checked, when necessary to PVC
Pipe 2 is dredged.
Before detection, the connection across hole radar detection device is carried out.One is set up respectively at adjacent two pvc pipes, 2 top
Tripod 3 is respectively provided on each tripod 3 and is oriented to ranging pulley 4,8 one end of cable connect with transmitting antenna 6, the other end
Ranging pulley 4 is oriented to via one to be wound on a reel 5, and pick out the transmitting terminal with radar host computer 9 from a reel 5
Mouth is connected；Equally, reception antenna 7 is connected to also by cable 8 via another guiding ranging pulley 4 and another reel 5
The receiving port of radar host computer 9.
Referring to Fig. 2.Carry out preliminary surveying.Since earth's surface, by transmitting antenna 6 and day is received respectively with two reels 5
Line 7 synchronizes decentralization to set step pitch, the primary acquisition primary radar data of often decentralization, until 2 bottom of pvc pipe is terminated, in decentralization process
Transmitting antenna 6 and reception antenna 7 are always positioned at same depth.Wave data is analyzed after the completion of preliminary surveying, if gone out
Existing first-arrival traveltime obvious postpone or through wave-amplitude are substantially reduced, and can tentatively judge that there may be defects 10 for the depth bounds.
Referring to Fig. 3.Accurately measured.It is accurately surveyed in a certain range above and below there may be the position of defect 10
Transmitting antenna 6 is fixed on the depth bounds top during measurement by amount with a reel 5, and reception antenna 7 is from the depth bounds top
Portion starts to transfer, and often decentralization setting step pitch acquires a data, until reception antenna 7 reaches selected depth bounds bottom
Portion.Then transmitting antenna 6 is transferred into setting step pitch and fixation, reception antenna 7 repeats aforesaid operations, until transmitting antenna 6 is transferred
To selected depth bounds bottom.Inversion imaging analysis is carried out to data after being accurately measured, it can be deduced that the tool of defect 10
Body position, size and shape.
Claims (6)
1. a kind of across hole radar detection device of diaphram wall internal flaw, it is characterised in that the detection device connects for underground
Continuous wall wall, in the steel reinforcement cage process of binding of the diaphram wall wall, pvc pipe is along diaphram wall depth direction
It is fixed on steel reinforcement cage；Several pvc pipes are respectively arranged at the interior thickness of diaphram wall wall, and connect along underground
The elongated arrangement of depth direction of continuous wall wall；Wherein：Including across hole radar system and antenna lifting mechanism；The antenna elevator
Structure is by several tripods, several are oriented to ranging pulley and several reels form, and each tripot is set on PVC
Tube top portion, equipped with ranging pulley is oriented on each tripod, each ranging pulley that is oriented to corresponds to a reel；Adjacent two
Between pvc pipe, transmitting antenna on a pvc pipe is set, reception antenna, a cable are set on another pvc pipe
One end is connect with transmitting antenna, and the cable other end is oriented to ranging pulley via one and is wound on a reel, and from the spiral
Wheel picks out, and is connected with the emission port of radar host computer；Equally, reception antenna, another PV are set on another pvc pipe
Reception antenna is set on C pipes, and another cable one end is connect with reception antenna, and another cable other end is led via another
It is wound on another reel to ranging pulley, and is picked out from the reel, is connected with the receiving port of radar host computer；The volume
Line wheel is driven by motor, it can be achieved that transmitting antenna and reception antenna are either synchronously or asynchronously transferred or promoted, and the tripod and is led
To ranging pulley for being positioned to transmitting antenna or reception antenna, being oriented to ranging pulley can be to transmitting antenna or reception antenna
Position and the height of decentralization or promotion in pvc pipe is surveyed measure.
A kind of 2. across hole radar detection device of diaphram wall internal flaw according to claim 1, it is characterised in that institute
The working frequency for stating radar system is 200 ~ 500MHz.
A kind of 3. across hole radar detection device of diaphram wall internal flaw according to claim 1, it is characterised in that institute
A diameter of 70mm of pvc pipe is stated, the tube spacing of adjacent pvc pipe is 1 ~ 2m.
A kind of 4. across hole radar detection device of diaphram wall internal flaw according to claim 1, it is characterised in that institute
It states transmitting antenna or reception antenna moving step pitch may be configured as 5cm or 10cm, the range accurately measured can be chosen to be tentatively
Judge in the range of the 1m up and down of depth residing for defect, depth residing for reception antenna or transmitting antenna and decentralization distance are by guiding ranging
Pulley measures.
A kind of 5. across hole radar detection device of diaphram wall internal flaw according to claim 1, it is characterised in that institute
It states a transmitting antenna and corresponds to one or several reception antennas.
6. a kind of diaphragm wall internal flaw as described in claim 1 exists across the detection method of hole radar detection device, feature
In including the following steps：
（1）In the steel reinforcement cage process of binding of diaphram wall wall, pvc pipe is fixed on steel reinforcement cage, pvc pipe should
It is arranged at diaphram wall body interior thickness, and along the elongated arrangement of diaphram wall depth direction；
（2）After the completion of diaphram wall wall pours, pvc pipe physical location is recorded, to pvc pipe effective depth
It is checked, pvc pipe is dredged when necessary；
（3）Tripod is set up respectively above adjacent two pvc pipe, and corresponding installation is oriented to ranging pulley；
（4）Will across hole radar receiving antenna and transmitting antenna by cable, be oriented to ranging pulley and reel connects via corresponding
Radar host computer is connected to, adjusting corresponding reel makes transmitting antenna and reception antenna be located at aperture and in same depth；
（5）Preliminary surveying is carried out, since aperture, synchronous transmitting antenna and the reception antenna of transferring is to test tube bottom, decentralization process
In at interval of setting step pitch acquisition primary radar data, obtained after being measured by data analysis with the presence or absence of defect and defect
Approximate depth；
（6）It is accurately measured, in step（5）It is judged as that in a certain range, transmitting antenna is consolidated up and down for possible defective locations
At the top of the range, reception antenna is transferred since depth bounds top, and often decentralization setting step pitch acquires a data, directly
Selected depth bounds bottom is reached to reception antenna；Then transmitting antenna is transferred into setting step pitch and fixation, reception antenna weight
Multiple aforesaid operations, until transmitting antenna is transferred to selected depth bounds bottom；It must be fallen vacant by data analysis after being measured
Sunken specific location, size and shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324173.9A CN108132263A (en) | 2017-12-13 | 2017-12-13 | Across the hole radar detection device of diaphram wall internal flaw and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324173.9A CN108132263A (en) | 2017-12-13 | 2017-12-13 | Across the hole radar detection device of diaphram wall internal flaw and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108132263A true CN108132263A (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711324173.9A Pending CN108132263A (en) | 2017-12-13 | 2017-12-13 | Across the hole radar detection device of diaphram wall internal flaw and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894259A (en) * | 2018-07-19 | 2018-11-27 | 中铁六局集团有限公司 | A kind of method of ultrasound examination subway construction of diaphragm wall quality |
| CN109212616A (en) * | 2018-11-30 | 2019-01-15 | 中国矿业大学(北京) | A kind of Ground Penetrating Radar CT transmission detection experimental provision |
| CN110243844A (en) * | 2019-05-09 | 2019-09-17 | 中国矿业大学(北京) | A kind of dam structure CT transmission detection device and its detection method |
| CN112924945A (en) * | 2021-03-10 | 2021-06-08 | 大连理工大学 | Underground diaphragm wall model test system based on cross-hole radar imaging |
| CN113252246A (en) * | 2021-06-18 | 2021-08-13 | 中国科学院武汉岩土力学研究所 | Recoverable underground continuous wall seam crossing leakage detection device |
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| CN101418579A (en) * | 2007-10-24 | 2009-04-29 | 上海隧道工程股份有限公司 | The detection method of diaphragm wall clay seam |
| CN101614022A (en) * | 2009-07-14 | 2009-12-30 | 邓业灿 | Tomography-based method for detecting foundation piles of building by elastics waves |
| CN106400851A (en) * | 2016-10-15 | 2017-02-15 | 广州中煤江南基础工程公司 | Height detecting system for concrete pouring surface of ultra-deep pile hole |
-
2017
- 2017-12-13 CN CN201711324173.9A patent/CN108132263A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418579A (en) * | 2007-10-24 | 2009-04-29 | 上海隧道工程股份有限公司 | The detection method of diaphragm wall clay seam |
| CN101614022A (en) * | 2009-07-14 | 2009-12-30 | 邓业灿 | Tomography-based method for detecting foundation piles of building by elastics waves |
| CN106400851A (en) * | 2016-10-15 | 2017-02-15 | 广州中煤江南基础工程公司 | Height detecting system for concrete pouring surface of ultra-deep pile hole |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894259A (en) * | 2018-07-19 | 2018-11-27 | 中铁六局集团有限公司 | A kind of method of ultrasound examination subway construction of diaphragm wall quality |
| CN109212616A (en) * | 2018-11-30 | 2019-01-15 | 中国矿业大学(北京) | A kind of Ground Penetrating Radar CT transmission detection experimental provision |
| CN110243844A (en) * | 2019-05-09 | 2019-09-17 | 中国矿业大学(北京) | A kind of dam structure CT transmission detection device and its detection method |
| CN112924945A (en) * | 2021-03-10 | 2021-06-08 | 大连理工大学 | Underground diaphragm wall model test system based on cross-hole radar imaging |
| CN112924945B (en) * | 2021-03-10 | 2023-09-22 | 大连理工大学 | Underground continuous wall model test system based on cross-hole radar imaging |
| CN113252246A (en) * | 2021-06-18 | 2021-08-13 | 中国科学院武汉岩土力学研究所 | Recoverable underground continuous wall seam crossing leakage detection device |
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