CN102955174A - Method and device for detecting geological flaws at bottom of foundation pile holes through geological radar - Google Patents
Method and device for detecting geological flaws at bottom of foundation pile holes through geological radar Download PDFInfo
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- CN102955174A CN102955174A CN2012103836374A CN201210383637A CN102955174A CN 102955174 A CN102955174 A CN 102955174A CN 2012103836374 A CN2012103836374 A CN 2012103836374A CN 201210383637 A CN201210383637 A CN 201210383637A CN 102955174 A CN102955174 A CN 102955174A
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Abstract
The invention discloses a method and a device for detecting geological flaws at bottom of foundation pile holes through geological radar. The device comprises a geological radar instrument (1) and a radar antenna (2) with frequency of 270Mhz, wherein the radar antenna (2) is connected with the geological radar instrument (1) by a radar antenna connecting cable (3); and an antenna lifting rope (4) and a pulley (8) are arranged and used for deploying and retracing the radar antenna (2). According to the method and the device disclosed by the invention, the advanced geological-radar based karst cave detecting technology is adopted, and the structural features of foundation pile holes are fully utilized, therefore, the karst caves at the bottom of the pile holes and the karst caves within 10 meters from piles can be detected; the method and the device are large in detection scope, high in field working efficiency, and clear in karst carve detection; by adopting the method and the device, the works of mechanically drilling holes or artificially drilling holes can be avoided, and the existence, the depth and the scope of the karst caves at the bottom of the piles and the karst carves within the scope of the pile hole embedment depth in rock can be universally detected; and a new efficient and quick method is provided for inspecting and accepting the engineering foundation pile holes.
Description
Technical field
The present invention relates to a kind of engineer geological prospecting method and device, particularly a kind of method and device that utilizes geological radar to detect Geological Defects at the bottom of the base pile hole is applicable to the foundation pile construction quality inspection and acceptance work of the industries such as urban construction, resident family's construction, water conservancy and hydropower, road and rail and factories and miness metallurgy.
Background technology
Foundation pile is the basis of buildings, in the architecture foundation pile construction, generally carry out first a hole excavation, after being excavated to projected depth, the general pricker that adopts rig (air compressor machine or other rigs) that certain depth (generally being 5 meters～10 meters) is carried out in bottom, stake hole is visited, to confirm that bottom, stake hole is without solution cavity, this regulation is the industry regulation that the building quality testing department carries out for guaranteeing foundation pile safety, but the general excavation of base pile hole is darker, diameter is little, and there is the execute-in-place difficulty in the method that adopts pricker to visit, and the pricker spy has line construction workman operation usually, determine the existence of solution cavity fully with feel, therefore its accuracy is relatively poor, affected by people's subjective consciousness larger, has certain limitation.Therefore, the method and apparatus of Geological Defects or undesirable at the bottom of the existing detection base pile hole.
Summary of the invention
The objective of the invention is for overcoming the deficiencies in the prior art, a kind of method and device that utilizes geological radar to detect Geological Defects at the bottom of the base pile hole is provided, make detection accuracy higher, testing result is more objective, and uses more extensive.
For realizing purpose of the present invention, a kind of geological radar of the present invention detects the method for Geological Defects at the bottom of the base pile hole, and wherein, the method may further comprise the steps:
1) select to have the geological radar instrument of summing point scanning and continuous sweep function more than 16 times, the frequency that configuration sized is not more than 50cm, shielding, waterproof sealing is the 270Mhz radar antenna, and the two is with the connection of radar antenna stube cable;
2) confirm base pile hole at the bottom of diameter whether meet the demands, measure a stake hole cutting depth, be confirmed whether to reach projected depth, whether ponding, earth at the bottom of watching, and remove to meeting the demands keep the dark 5～10cm of stake hole bottom ponding simultaneously;
3) at the bottom of base pile hole according to pile lining " U " molded line road of---stake end---pile lining arrange two cross one another north and south, thing radar scanning survey line;
4) parameter of geological radar instrument is set, radar antenna is transferred measuring point at the bottom of the base pile hole by pulley and antenna hoisting rope;
5) open geological radar instrument inlet point measuring state, " U " type radar scanning survey line along two predetermined intersections carries out radar scanning, scanning process keeps measurement point apart from accurate and radar signal stacking fold, keeps the coupling of stake hole bottom shallow water layer and radar antenna good;
The data of " U " type radar scanning survey line of two intersections 6) will obtaining reach on the computing machine, carry out data and process;
7) confirm the reflection of radar wave energy distribution, have or not reflected wave information according to data processed result, then calculate the reflection wave degree of depth, scope if any reflected wave information, draw stake end solution cavity geologic interpretation figure.
Simultaneously, the present invention also provides a kind of geological radar to detect the device of Geological Defects at the bottom of the base pile hole, comprise the geological radar instrument, wherein, it is the 270Mhz radar antenna that this device is provided with frequency, radar antenna is connected with described geological radar instrument by the radar antenna stube cable, and is provided with antenna hoisting rope and pulley for the folding and unfolding of radar antenna.
Further, described radar antenna is " U " type survey line that north and south, thing intersect at stake borehole radar scanning survey line.
The minimum detection stake hole dimension of detection method of the present invention is not less than 100cm, and hole depth is not limit.Can be widely used in municipal administration, firmly build, architecture foundation pile checking and accepting, the especially karst area Southwest China of the construction field such as traffic, water conservancy and hydropower.Instrument equipment of the present invention is conventional domestic or import geological radar, used antenna is shielding, water proof type monomer 270Mhz radar antenna, scanning device is light and handy, size conforms hole stake size, and on-the-spot easy operating, solution cavity are identified directly perceived, high efficiency unusually, and be applied widely; The stake hole radar scanning survey line of design is " U " type survey line that north and south, thing intersect, and scope has covered bottom, stake hole and entered around the rock, guarantees not omit the Geological Defects such as solution cavity; 15～25cm radar scanning point of design is apart from, stake hole bottom water injection 5～10cm, greatly improved the coupling condition at radar antenna and an end, makes that investigative range and the degree of depth are larger, radar signal is stronger, guaranteed detection accuracy and depth range; Adopt the technology of Discrimination Radar reflection wave and instrumentation radar reflected signal to judge solution cavity, determine that the methodological science of solution cavity depth location and scope is reasonable, reliable and stable.The present invention adopts advanced geological radar CAVE DETECTION technology, take full advantage of the design feature of base pile hole, energy detects the solution cavity in bottom, stake hole and all 10 meters scopes of stake, sensing range is large, work on the spot efficient is high, it is directly perceived to survey solution cavity, machinery or Manual punching work have been avoided, at the bottom of can detecting in all directions and stake hole enters existence, buried depth and the scope of solution cavity in the rock depth range, and checking and accepting for engineering Under Pile hole provides a kind of effectively and rapidly new method.
Description of drawings
Fig. 1 is that radar scanning of the present invention detects schematic diagram (east-west direction);
Fig. 2 is device connection layout of the present invention;
Fig. 3 is radar scanning survey line schematic diagram of the present invention;
Fig. 4 is radar scanning image schematic diagram of the present invention.
Being labeled as in the accompanying drawing: 1-geological radar instrument, 2-antenna, 3-radar antenna stube cable, 4-antenna hoisting rope, east-west direction scanning survey line at the bottom of the 5-hole, North and South direction scanning survey line at the bottom of the 6-hole, 7-foundation pile hole wall, 8-pulley.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
See first Fig. 1, what Fig. 1 showed is the detection schematic diagram of east-west direction radar scanning of the present invention, and the detection schematic diagram of North and South direction radar scanning of the present invention and the detection schematic diagram of east-west direction radar scanning are similar.See Fig. 1, Fig. 2, the present invention has adopted a kind of geological radar to detect the device of Geological Defects at the bottom of the base pile hole, it is 270Mhz radar antenna 2 that this device is provided with frequency, radar antenna 2 is connected with described geological radar instrument 1 by radar antenna stube cable 3, and is provided with antenna hoisting rope 4 and pulley 8 for the folding and unfolding of radar antenna 2.See Fig. 1, Fig. 3, east-west direction scanning survey line 5 at the bottom of the hole of the present invention that Fig. 1 shows, this survey line is from pile lining---stake end---" U " type survey line that is disposed in order formation of pile lining, wherein pile lining part survey line height is 1～3m, stake bottom minute survey line width equals the diameter R at the bottom of the base pile hole.See Fig. 3, at the bottom of the hole at the bottom of east-west direction scanning survey line 5 and the hole North and South direction scanning survey line 6 be two cross one another surveys line, and two surveys line all pass through central point at the bottom of the base pile hole.Article two, the survey line two ends arrive the foundation pile hole wall 7 rear surveys line that extend upward each self-forming " U " type along foundation pile hole wall 7, scan since a side pile lining when detecting, then---stake end---scanning route of pile lining scans the stake end, scans at last the pile lining of opposite side, form pile lining.
During the invention process, carry out first geological radar instrument 1 and radar antenna 2 configurations, in-situ determination stake hole condition, then carry out radar scanning according to stake hole " U " type survey line, after scanning is finished the radar data input computing machine that obtains is carried out the radar scanning image and process, draw at last stake hole solution cavity Geological Achievements figure.
Concrete step is as follows:
1) select to have the geological radar instrument 1 of summing point scanning and continuous sweep function more than 16 times, the frequency that configuration sized is not more than 50cm, shielding, waterproof sealing is 270Mhz radar antenna 2, and the two is with 3 connections of radar antenna stube cable;
2) confirm base pile hole at the bottom of diameter whether meet the demands, measure a stake hole cutting depth, be confirmed whether to reach projected depth, whether ponding, earth at the bottom of watching, and remove to meeting the demands keep the dark 5～10cm of stake hole bottom ponding simultaneously;
3) at the bottom of base pile hole according to pile lining " U " molded line road of---stake end---pile lining arrange two cross one another north and south, thing radar scanning survey line;
4) parameter of geological radar instrument 1 is set, radar antenna 2 is transferred measuring point at the bottom of the base pile hole by pulley 8 and antenna hoisting rope 4;
5) open geological radar instrument 1 inlet point measuring state, " U " type radar scanning survey line along two predetermined intersections carries out radar scanning, scanning process keeps measurement point apart from being 15～25cm, keeps the radar signal stacking fold, keeps stake hole bottom shallow water layer and radar antenna 2 couplings good;
The data of " U " type radar scanning survey line of two intersections 6) will obtaining reach on the computing machine, carry out data and process;
7) confirm the reflection of radar wave energy distribution, have or not reflected wave information according to data processed result, then calculate the reflection wave degree of depth, scope if any reflected wave information, draw stake end solution cavity geologic interpretation figure.
During detecting, the present invention forms " U " type radar scanning image of two intersections, by the radar return signal of identification " U " type radar image or the intensity of instrumentation radar reflected signal, judge at the bottom of the hole and whether have depth of burial and the scope of solution cavity, solution cavity hole week.As shown in Figure 4, what Fig. 4 showed is the radar scanning image of stake end radar scanning image of the present invention and two sidewalls, what the left side and the right were showed among the figure is the radar scanning image of two sidewalls, the bottom is showed be at the bottom of the radar scanning image, radar emission effect when having solution cavity in the radar scanning image at the bottom of from figure, can clearly seeing, thus can judge soon the situation such as position, size of solution cavity.
More than be a concrete exemplary applications of the present invention, the present invention also has other embodiment, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the desired protection domain of this present invention.
Claims (3)
1. a geological radar detects the method for Geological Defects at the bottom of the base pile hole, and it is characterized in that: the method may further comprise the steps:
1) select to have the geological radar instrument (1) of summing point scanning and continuous sweep function more than 16 times, the frequency that configuration sized is not more than 50cm, shielding, waterproof sealing is 270Mhz radar antenna (2), and the two is with radar antenna stube cable (3) connection;
2) confirm base pile hole at the bottom of diameter whether meet the demands, measure a stake hole cutting depth, be confirmed whether to reach projected depth, whether ponding, earth at the bottom of watching, and remove to meeting the demands keep the dark 5～10cm of stake hole bottom ponding simultaneously;
3) at the bottom of base pile hole according to pile lining " U " molded line road of---stake end---pile lining arrange two cross one another north and south, thing radar scanning survey line;
4) parameter of geological radar instrument (1) is set, radar antenna (2) is transferred measuring point at the bottom of the base pile hole by pulley (8) and antenna hoisting rope (4);
5) open geological radar instrument (1) inlet point measuring state, " U " type radar scanning survey line along two predetermined intersections carries out radar scanning, it is 15～25cm that scanning process keeps the measurement point distance, keep the radar signal stacking fold, keep the coupling of stake hole bottom shallow water layer and radar antenna (2) good;
The data of " U " type radar scanning survey line of two intersections 6) will obtaining reach on the computing machine, carry out data and process;
7) confirm the reflection of radar wave energy distribution, have or not reflected wave information according to data processed result, then calculate the reflection wave degree of depth, scope if any reflected wave information, draw stake end solution cavity geologic interpretation figure.
2. a geological radar detects the device of Geological Defects at the bottom of the base pile hole, comprise geological radar instrument (1), it is characterized in that: it is 270Mhz radar antenna (2) that this device is provided with frequency, radar antenna (2) is connected with described geological radar instrument (1) by radar antenna stube cable (3), and is provided with antenna hoisting rope (4) and pulley (8) for the folding and unfolding of radar antenna (2).
3. geological radar according to claim 2 detects the device of Geological Defects at the bottom of the base pile hole, and it is characterized in that: described radar antenna (2) is " U " type survey line that north and south, thing intersect at stake borehole radar scanning survey line.
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| CN201210383637.4A CN102955174B (en) | 2012-10-11 | 2012-10-11 | Method and device for detecting geological flaws at bottom of foundation pile holes through geological radar |
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Cited By (10)
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| CN103255756A (en) * | 2013-05-14 | 2013-08-21 | 中冶交通工程技术有限公司 | Method using geological radar for surveying pile foundation cave |
| CN103898931A (en) * | 2014-04-11 | 2014-07-02 | 广州建设工程质量安全检测中心有限公司 | Three-dimensional foundation pile detection device and method based on borehole radar |
| CN103913777A (en) * | 2014-04-28 | 2014-07-09 | 中国科学院亚热带农业生态研究所 | Geological radar detection method for karst non-continuity soil and rock distribution |
| CN105332395A (en) * | 2015-12-04 | 2016-02-17 | 山东正元工程检测有限公司 | Detecting method for pile-bottom supporting layer of mechanical pore-forming concrete filling pile |
| CN105549067A (en) * | 2015-11-27 | 2016-05-04 | 中国电建集团贵阳勘测设计研究院有限公司 | Device and method for detecting pile hole base geological flaws through sound wave reflection |
| CN106338729A (en) * | 2016-08-02 | 2017-01-18 | 中南大学 | Method for inversing railway base track bed contamination rate by using ground penetrating radar |
| CN107167848A (en) * | 2017-04-17 | 2017-09-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method of the accurate detection manually digging hole filling pile stake molten developmental state of bed rock |
| CN112849173A (en) * | 2020-12-22 | 2021-05-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Operation railway tunnel detects maintenance flatcar |
| CN113357497A (en) * | 2021-06-17 | 2021-09-07 | 安徽省庐江龙桥矿业有限公司 | Hole entering centering device of drilling radar detector |
| CN114000548A (en) * | 2021-09-30 | 2022-02-01 | 深圳市房屋安全和工程质量检测鉴定中心 | Foundation pile rock-socketed depth detection method based on sound wave method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255756A (en) * | 2013-05-14 | 2013-08-21 | 中冶交通工程技术有限公司 | Method using geological radar for surveying pile foundation cave |
| CN103898931A (en) * | 2014-04-11 | 2014-07-02 | 广州建设工程质量安全检测中心有限公司 | Three-dimensional foundation pile detection device and method based on borehole radar |
| CN103898931B (en) * | 2014-04-11 | 2016-06-08 | 广州建设工程质量安全检测中心有限公司 | A kind of base stake three-dimensional detection device based on boring radar and base stake 3 D detection method |
| CN103913777A (en) * | 2014-04-28 | 2014-07-09 | 中国科学院亚热带农业生态研究所 | Geological radar detection method for karst non-continuity soil and rock distribution |
| CN103913777B (en) * | 2014-04-28 | 2016-06-22 | 中国科学院亚热带农业生态研究所 | The geologic radar detection method of karst noncontinuity soil and rock distribution |
| CN105549067B (en) * | 2015-11-27 | 2019-08-02 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of device and method of sound wave reflection detection stake holes substrate Geological Defects |
| CN105549067A (en) * | 2015-11-27 | 2016-05-04 | 中国电建集团贵阳勘测设计研究院有限公司 | Device and method for detecting pile hole base geological flaws through sound wave reflection |
| CN105332395A (en) * | 2015-12-04 | 2016-02-17 | 山东正元工程检测有限公司 | Detecting method for pile-bottom supporting layer of mechanical pore-forming concrete filling pile |
| CN106338729B (en) * | 2016-08-02 | 2019-02-22 | 中南大学 | A method of with Ground Penetrating Radar inverting railway bed railway roadbed pollution rate |
| CN106338729A (en) * | 2016-08-02 | 2017-01-18 | 中南大学 | Method for inversing railway base track bed contamination rate by using ground penetrating radar |
| CN107167848A (en) * | 2017-04-17 | 2017-09-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method of the accurate detection manually digging hole filling pile stake molten developmental state of bed rock |
| CN112849173A (en) * | 2020-12-22 | 2021-05-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Operation railway tunnel detects maintenance flatcar |
| CN113357497A (en) * | 2021-06-17 | 2021-09-07 | 安徽省庐江龙桥矿业有限公司 | Hole entering centering device of drilling radar detector |
| CN114000548A (en) * | 2021-09-30 | 2022-02-01 | 深圳市房屋安全和工程质量检测鉴定中心 | Foundation pile rock-socketed depth detection method based on sound wave method |
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