CN108844684A - A method of monitoring diaphram wall seam crossing leakage scenarios - Google Patents
A method of monitoring diaphram wall seam crossing leakage scenarios Download PDFInfo
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- CN108844684A CN108844684A CN201810343488.6A CN201810343488A CN108844684A CN 108844684 A CN108844684 A CN 108844684A CN 201810343488 A CN201810343488 A CN 201810343488A CN 108844684 A CN108844684 A CN 108844684A
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- electrode
- diaphram wall
- measurement point
- survey line
- natural potential
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of methods for monitoring diaphram wall seam crossing leakage scenarios, reinforcement cage structure based on diaphram wall, using the setting electrode survey line in diaphram wall, and multiple electrodes measurement point is set on each electrode survey line, the leakage scenarios of diaphram wall are then monitored using self-potential method.The present invention have it is easy for construction, without drilling, reduce construction cost, and wall will not be caused to damage, while measurement point increases detection accuracy and accuracy close to breakthrough position；In addition it can not only position diaphram wall seam crossing leak location, diaphram wall leakage scenarios can also be continued to monitor in the later period, having filled up the laying electrode in diaphram wall uses self-potential method to detect and monitor the blank of diaphram wall leak location, has good directive function safely to guarantee excavation of foundation pit.
Description
Technical field
The present invention relates to a kind of method for monitoring diaphram wall, specifically a kind of monitoring diaphram wall seam crossing leakage
The method of situation.
Background technique
Diaphram wall is widely used in the deep foundation pit construction of urban skyscraper, subway etc., has load-bearing, gear
Soil intercepts water, the functions such as antiseepage, and therefore, the leakage scenarios of diaphram wall directly affect the safe mass of skyscraper, subway etc.
Problem.Wherein, for whether being sealed very containing the connector connection (i.e. seam) between steel reinforcement cage diaphram wall adjacent slot section
Key is the emphasis position that diaphram wall most easily leaks, if joint has silt particle to be mixed into, will lead to be not connected firmly
Gu there is the possibility leaked.Therefore, whether evaluation diaphram wall leaks or finds out leak location to guarantee excavation of foundation pit
Safety is of great significance.The detection method that industry mainly uses at present for supercritical ultrasonics technology and resistivity method, examining by these modes
It is required to that diaphram wall is caused to damage when survey, such as drills, so after sensing to the subsequent stabilization of diaphram wall
It is influenced using will cause, in addition above-mentioned method is most likely to occur the seam crossing of leakage due to that can not approach when detecting,
Its detection accuracy and accuracy are lower；Above two method is limited by its current site operation arrangement simultaneously, is completed in construction
Long-term monitoring of leakage cannot be carried out to diaphram wall afterwards.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of monitoring diaphram wall seam crossing leakage scenarios
Method, it is easy for construction, without drilling, reduce construction cost, and wall will not be caused to damage, while measurement point is close
Breakthrough position increases detection accuracy and accuracy.
To achieve the goals above, the technical solution adopted by the present invention is that：A kind of monitoring diaphram wall seam crossing leakage
The method of situation, the specific steps are that：
A, the steel reinforcement cage shape that diaphram wall is determined according to construction of diaphragm wall type, then in diaphram wall
Electrode survey line is laid in joint and corner；
B, each electrode survey line is longitudinally laid at installation position along diaphram wall, and electrode survey line passes through insulating cement
Band is fixed on the steel reinforcement cage of diaphram wall；
C, multiple electrodes measurement point is opened up on each electrode survey line, and on the partial electrode survey line in water-bearing layer
The distance between adjacent electrode measurement point is d, and the distance between adjacent electrode measurement point on rest part electrode survey line is d's
2~5 times；The electrode of water-bearing layer position is encrypted, increases detection accuracy, specific distance can be according to the practical feelings in scene
Condition determines；
D, the steel reinforcement cage with electrode survey line is put into diaphram wall box cut section, steel is then made using concrete grouting
Muscle cage is embedded to wherein, at this time the electrode measurement point on steel reinforcement cage and surrounding medium coupling contact；
E, it is laid around diaphram wall and compares electrode N, after the concreting for completing diaphram wall, by electrode
Survey line is successively connect with line bank according to electrode sequence；
F, by the big line of electrical method of network concurrency instrument and line bank, compared with electrode N connection, before carrying out bailing test, network
Parallel electrical prospecting apparatus is to electrode measurement point and compares potential value measurement of electrode N progress, the electricity of each electrode measurement point measured
Place value subtracts the potential value for comparing electrode N, obtains the background natural potential value SP of each electrode measurement pointi0, wherein i=1~
n；
G, respectively to diaphram wall X0A water-bearing layer successively carries out bailing test, uses when each water-bearing layer is drawn water
Electrical method of network concurrency instrument is to electrode measurement point and compares potential value measurement of electrode N progress, each electrode measurement point measured
Potential value subtract the potential value for comparing electrode N, obtain the natural potential value SP of each electrode measurement pointij, wherein i=1~
N, j=1~X0；
H, the natural potential value SP that will be obtainedijWith background natural potential value SPi0Poor calculating is asked, is obtained between the two
Natural potential difference Δ SPij, specific formula is Δ SPij=SPij-SPi0, wherein i=1~n, j=1~X0；Obtained each electrode
The natural potential difference Δ SP of measurement pointijIf natural potential keeps stablizing before and after illustrating bailing test, and electrode is surveyed close to 0mV
Amount point position does not have breakthrough nearby；If the natural potential difference Δ SP of each electrode measurement pointijIn there are negative values, then illustrate
The natural potential value of the electrode measurement point present position reduces after bailing test, further relates to the electrode measurement point and nearby there is infiltration
Leak source；
I, line bank is placed into insulation joint box, and insulation joint box is embedded in the ground after the completion of construction,
Long term monitoring is carried out after the completion of entire construction, is changed by the natural potential that electrical method of network concurrency instrument observes each electrode measurement point
Trend, if certain point natural potential persistently occurs reducing or persistently increase, there are new leak locations for diaphram wall, in turn
Take subsequent remedial measure；Compare any one electrode measurement in electrode N selection electrode survey line during long term monitoring
Point conduct is compared electrode and is measured.
Further, the relatively installation position of electrode N is by the smallest position of external interference.
Further, the distance between described electrode measurement point d is 0.25m.
Further, the electrode survey line uses multicore cable.
Compared with prior art, the present invention use in diaphram wall be arranged electrode survey line, using self-potential method into
The leakage scenarios of row monitoring diaphram wall, the present invention have it is easy for construction, without drilling, reduce construction cost, and will not
Wall is caused to damage, while measurement point increases detection accuracy and accuracy close to breakthrough position；In addition it can not only be over the ground
Lower diaphragm wall seam crossing leak location is positioned, moreover it is possible to be continued to monitor diaphram wall leakage scenarios in the later period, filled up
Electrode is laid in diaphram wall and detects and monitor the blank of diaphram wall leak location using self-potential method, to guarantee base
Safety is excavated in hole has good directive function.
Detailed description of the invention
Fig. 1 is floor plan of the present invention in "-" type diaphram wall；
Fig. 2 is floor plan of the present invention in L font diaphram wall；
Fig. 3 is floor plan of the present invention in T font diaphram wall；
Fig. 4 is floor plan of the present invention in Z-shaped diaphram wall；
Fig. 5 is that electrode survey line is longitudinally arranged figure in diaphram wall in the present invention.
Specific embodiment
The invention will be further described below.
As shown in Figures 1 to 5, it is of the invention the specific steps are：
A, the steel reinforcement cage shape that diaphram wall is determined according to construction of diaphragm wall type, then in diaphram wall
Electrode survey line is laid in joint and corner；
B, each electrode survey line is longitudinally laid at installation position along diaphram wall, and electrode survey line passes through insulating cement
Band is fixed on the steel reinforcement cage of diaphram wall；
C, 48 electrode measurement points are opened up on each electrode survey line, and on the partial electrode survey line in water-bearing layer
The distance between adjacent electrode measurement point is 0.25m, the distance between the adjacent electrode measurement point on rest part electrode survey line
For 0.5m；The electrode survey line of use is made of 68 core cables, successively gives cable number according to electrode sequence, and record every core
The corresponding respective electrode number of line；The depth location where electrode peels off the insulated hull of every core cable, make its expose copper wire 2~
3cm, the exposed copper wire are the measuring electrode for being used as natural potential；
D, the steel reinforcement cage with electrode survey line is put into diaphram wall box cut section, steel is then made using concrete grouting
Muscle cage is embedded to wherein, at this time the electrode measurement point on steel reinforcement cage and surrounding medium coupling contact；
E, it is laid around diaphram wall and compares electrode N, after the concreting for completing diaphram wall, by electrode
Survey line is successively connect with line bank according to electrode sequence；
F, by the big line of electrical method of network concurrency instrument and line bank, compared with electrode N connection used before carrying out bailing test
Electrical method of network concurrency instrument is to electrode measurement point and compares potential value measurement of electrode N progress, each electrode measurement point measured
Potential value subtract the potential value for comparing electrode N, obtain the background natural potential value SP of each electrode measurement pointi0, wherein i=
1~48；
G, respectively to diaphram wall X0A water-bearing layer successively carries out bailing test, uses when each water-bearing layer is drawn water
Electrical method of network concurrency instrument is to electrode measurement point and compares potential value measurement of electrode N progress, each electrode measurement point measured
Potential value subtract the potential value for comparing electrode N, obtain the natural potential value SP of each electrode measurement pointij, wherein i=1~
48, j=1~X0；
H, the natural potential value SP that will be obtainedijWith background natural potential value SPi0Poor calculating is asked, is obtained between the two
Natural potential difference Δ SPij, specific formula is Δ SPij=SPij-SPi0, wherein i=1~48, j=1~X0；Obtained each electricity
The natural potential difference Δ SP of pole measurement pointijIf natural potential keeps stablizing before and after illustrating bailing test, electrode close to 0mV
Measurement point position does not have breakthrough nearby；If the natural potential difference Δ SP of each electrode measurement pointijIn there are negative values, then say
The natural potential value of the electrode measurement point present position reduces after bright bailing test, further relates to the electrode measurement point and nearby exists
Breakthrough；
I, line bank is placed into insulation joint box, and insulation joint box is embedded in the ground after the completion of construction,
Long term monitoring is carried out after the completion of entire construction, is changed by the natural potential that electrical method of network concurrency instrument observes each electrode measurement point
Trend, if certain point natural potential persistently occurs reducing or persistently increase, there are new leak locations for diaphram wall, in turn
Take subsequent remedial measure；Compare any one electrode measurement in electrode N selection electrode survey line during long term monitoring
Point conduct is compared electrode and is measured.
Further, the relatively installation position of electrode N is by the smallest position of external interference.
Claims (4)
1. a kind of method for monitoring diaphram wall seam crossing leakage scenarios, which is characterized in that the specific steps are that：
A, the steel reinforcement cage shape that diaphram wall is determined according to construction of diaphragm wall type, then in the connector of diaphram wall
Electrode survey line is laid in junction and corner；
B, each electrode survey line is longitudinally laid at installation position along diaphram wall, and electrode survey line is solid by insulating tape
It is scheduled on the steel reinforcement cage of diaphram wall；
C, multiple electrodes measurement point is opened up on each electrode survey line, and adjacent on the partial electrode survey line in water-bearing layer
The distance between electrode measurement point is d, and the distance between adjacent electrode measurement point on rest part electrode survey line is the 2~5 of d
Times；
D, the steel reinforcement cage with electrode survey line is put into diaphram wall box cut section, steel reinforcement cage is then made using concrete grouting
It is embedded to wherein, at this time the electrode measurement point on steel reinforcement cage and surrounding medium coupling contact；
E, it is laid around diaphram wall and compares electrode N, after the concreting for completing diaphram wall, by electrode survey line
It is successively connect with line bank according to electrode sequence；
F, by the big line of electrical method of network concurrency instrument and line bank, compared with electrode N connection, before carrying out bailing test, using network
Parallel electrical prospecting apparatus is to electrode measurement point and compares potential value measurement of electrode N progress, the electricity of each electrode measurement point measured
Place value subtracts the potential value for comparing electrode N, obtains the background natural potential value SP of each electrode measurement pointi0, wherein i=1~
n；
G, respectively to diaphram wall X0A water-bearing layer successively carries out bailing test, and network is used when each water-bearing layer is drawn water
Parallel electrical prospecting apparatus is to electrode measurement point and compares potential value measurement of electrode N progress, the electricity of each electrode measurement point measured
Place value subtracts the potential value for comparing electrode N, obtains the natural potential value SP of each electrode measurement pointij, wherein i=1~n, j=
1~X0；
H, the natural potential value SP that will be obtainedijWith background natural potential value SPi0Poor calculating is asked, natural electricity between the two is obtained
Potential difference Δ SPij, specific formula is Δ SPij=SPij-SPi0, wherein i=1~n, j=1~X0；Obtained each electrode measurement point
Natural potential difference Δ SPijIf natural potential keeps stablizing before and after illustrating bailing test, electrode measurement point institute close to 0mV
There is no breakthrough near position；If the natural potential difference Δ SP of each electrode measurement pointijIn there are negative value, then explanation is drawn water examination
The natural potential value of the electrode measurement point present position reduces after testing, and further relating to the electrode measurement point, nearby there are breakthroughs；
I, line bank is placed into insulation joint box, and insulation joint box is embedded in the ground after the completion of construction, entire
Long term monitoring is carried out after the completion of construction, is become by the natural potential variation that electrical method of network concurrency instrument observes each electrode measurement point
Gesture, if certain point natural potential persistently occurs reducing or persistently increase, there are new leak locations for diaphram wall, and then adopt
Take subsequent remedial measure；Compare any one electrode measurement point in electrode N selection electrode survey line during long term monitoring
It is measured as electrode is compared.
2. a kind of method for monitoring diaphram wall seam crossing leakage scenarios according to claim 1, which is characterized in that institute
The installation position for comparing electrode N is stated as by the smallest position of external interference.
3. a kind of method for monitoring diaphram wall seam crossing leakage scenarios according to claim 1, which is characterized in that institute
Stating the distance between electrode measurement point d is 0.25m.
4. a kind of method for monitoring diaphram wall seam crossing leakage scenarios according to claim 1, which is characterized in that institute
Electrode survey line is stated using multicore cable.
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Cited By (7)
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| CN109440777A (en) * | 2018-11-23 | 2019-03-08 | 中国人民解放军63926部队 | Underground structure concrete construction joint leaks advanced monitoring warning device and construction method |
| CN109577392A (en) * | 2019-01-21 | 2019-04-05 | 中国科学院武汉岩土力学研究所 | Ground-connecting-wall seam monitoring of leakage prosthetic device and method based on optical fiber temperature-measurement |
| CN110006595A (en) * | 2019-03-20 | 2019-07-12 | 中铁四局集团有限公司 | Ultra-deep foundation pit support structure plane leakage detection method |
| CN111021380A (en) * | 2019-12-06 | 2020-04-17 | 中冶天工集团有限公司 | Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof |
| CN113376700A (en) * | 2021-06-08 | 2021-09-10 | 中国电建集团贵阳勘测设计研究院有限公司 | Industry solid waste storage yard leakage area surveys observation system |
| CN115346342A (en) * | 2022-08-12 | 2022-11-15 | 骄鹏科技(北京)有限公司 | Urban roadbed detection method and device and electronic equipment |
| CN117189239A (en) * | 2023-09-07 | 2023-12-08 | 中国矿业大学 | Tunnel surrounding rock damage monitoring method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109577392A (en) * | 2019-01-21 | 2019-04-05 | 中国科学院武汉岩土力学研究所 | Ground-connecting-wall seam monitoring of leakage prosthetic device and method based on optical fiber temperature-measurement |
| CN109577392B (en) * | 2019-01-21 | 2023-09-15 | 中国科学院武汉岩土力学研究所 | Underground continuous wall joint leakage monitoring and repairing device and method based on optical fiber temperature measurement |
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| CN111021380A (en) * | 2019-12-06 | 2020-04-17 | 中冶天工集团有限公司 | Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof |
| CN111021380B (en) * | 2019-12-06 | 2021-11-16 | 中冶天工集团有限公司 | Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof |
| CN113376700A (en) * | 2021-06-08 | 2021-09-10 | 中国电建集团贵阳勘测设计研究院有限公司 | Industry solid waste storage yard leakage area surveys observation system |
| CN115346342A (en) * | 2022-08-12 | 2022-11-15 | 骄鹏科技(北京)有限公司 | Urban roadbed detection method and device and electronic equipment |
| CN115346342B (en) * | 2022-08-12 | 2023-12-12 | 骄鹏科技(北京)有限公司 | Urban roadbed detection method and device and electronic equipment |
| CN117189239A (en) * | 2023-09-07 | 2023-12-08 | 中国矿业大学 | Tunnel surrounding rock damage monitoring method |
| CN117189239B (en) * | 2023-09-07 | 2024-04-19 | 中国矿业大学 | Tunnel surrounding rock damage monitoring method |
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