CN214530738U - A stagnant water effect evaluation device for stagnant water curtain - Google Patents
A stagnant water effect evaluation device for stagnant water curtain Download PDFInfo
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- CN214530738U CN214530738U CN202120339968.2U CN202120339968U CN214530738U CN 214530738 U CN214530738 U CN 214530738U CN 202120339968 U CN202120339968 U CN 202120339968U CN 214530738 U CN214530738 U CN 214530738U
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Abstract
The utility model discloses a stagnant water effect evaluation device for stagnant water curtain should be used for stagnant water effect evaluation device of stagnant water curtain to include: the waterproof curtain is a closed waterproof structure arranged along the periphery of the foundation pit, and a plurality of dredging wells are arranged on the inner side of the foundation pit; a plurality of test tubes which are pre-embedded in the waterproof curtain at intervals along the perimeter direction of the waterproof curtain; the testing electrodes are fixed on the testing tube at intervals along the length direction of the testing tube, and each testing electrode comprises a testing cable penetrating through the testing tube; the data collection device is connected with the test cable and used for collecting data; and the data analysis device is connected with the data collection device and is used for analyzing the collected data, the plurality of test tubes are arranged at equal intervals along the perimeter direction of the waterproof curtain, and the interval between every two adjacent test tubes is 5-20 m. The utility model discloses a device can carry out qualitative and quantitative analysis to the stagnant water effect of stagnant water curtain and judge to foundation ditch engineering risk has been reduced.
Description
Technical Field
The utility model relates to a construction technical field, concretely relates to stagnant water effect evaluation device for stagnant water curtain.
Background
Along with the rapid development of cities, super-large and ultra-deep foundation pit engineering is increasing. With the advocation of green development concept in recent years, large-scale unregulated precipitation is forbidden, and the waterproof curtain is more and more applied to ultra-deep foundation pits in high-groundwater-level areas. The construction concealment of the waterproof curtain engineering is high, and the condition that the waterproof structure has defects and leaks is common due to the construction technology and construction process or uncertain factors of complex geological conditions and the like. However, the waterproof effect of the waterproof curtain directly affects the safety of the foundation pit and the deformation of the surrounding environment, and also affects the construction period, so that the waterproof effect needs to be evaluated before the foundation pit is excavated, the potential defect position of the waterproof curtain needs to be determined in advance and repaired, and therefore engineering accidents are prevented.
At present, evaluation methods for waterproof curtains are few, and integrity and material strength detection and a group well water pumping test are mainly performed, wherein the integrity and material strength detection belongs to an indirect detection method, whether gaps exist in pile waterproof curtains or not cannot be detected, and whether water permeates in defect parts or not cannot be determined; the group well pumping test is that a plurality of pumping holes are arranged in a foundation pit, so that the water level in the foundation pit is wholly reduced, the water stopping effect of the water stopping curtain is judged by observing the water level change conditions of the inner observation hole and the outer observation hole which are arranged along the edge of the foundation pit, but a large number of pumping holes and observation holes need to be arranged, so that a large amount of manpower and material resources are consumed, the pumping amount is large, the test period is long, and the cost is high. Moreover, both of the above methods are qualitative evaluations and do not indicate the specific location of the leak path.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stagnant water effect evaluation device for stagnant water curtain to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the present invention provides a water stop effect evaluation device for a water stop curtain, including: the waterproof curtain is a closed waterproof structure arranged along the periphery of the foundation pit, and a plurality of dredging wells are arranged on the inner side of the foundation pit; the test tubes are embedded in the waterproof curtain at intervals along the circumferential direction of the waterproof curtain; the test electrodes are fixed on the test tube at intervals along the length direction of the test tube, and each test electrode comprises a test cable penetrating through the test tube; a data collection device connected to the test cable; and the data analysis device is connected with the data collection device, a plurality of test tubes are arranged at equal intervals along the perimeter direction of the waterproof curtain, and the interval between every two adjacent test tubes is 5-20 m.
In a preferred embodiment, the data collection device includes a chassis, a cable interface, a USB interface and a power line, all test cables in the same test tube are connected to a cable centralized slot, the test cables in the same test tube are connected to the cable interface through the cable centralized slot, and the USB interface is connected to the data analysis device.
In a preferred embodiment, the length of the test tube is less than the depth of the waterproof curtain, the arrangement of the test tube in the plane direction of the waterproof curtain is biased to the position in the pit, and the edge of the test tube is 200mm away from the inner side edge of the waterproof curtain.
In a preferred embodiment, the test electrode further comprises an electrode rod, an electrode nut and a fastener, a through hole penetrating through the electrode rod is formed in the test tube, the electrode rod is fixedly connected with the test tube through the electrode nut and the fastener after penetrating through the through hole, and the internal copper core of the test cable is in contact connection with the electrode rod positioned in the test tube.
In a preferred embodiment, the test electrodes are arranged at equal intervals along the length direction of the test tube, the interval between two adjacent test electrodes is 2-5m, and at least four test electrodes are arranged on each test tube.
In a preferred embodiment, the test tube is a rigid PVC tube, and the diameter of the test tube is 50-80 mm.
In a preferred embodiment, the distance between the drainage well close to the periphery of the foundation pit and the waterproof curtain in the foundation pit is less than or equal to 12 m.
In a preferred embodiment, the data analysis device is a laptop, a desktop or a workstation.
Compared with the prior art, the utility model discloses a stagnant water effect evaluation device for stagnant water curtain's beneficial effect is:
(1) the utility model does not need to arrange a large number of water pumping holes and observation holes, and directly utilizes the drain well in the foundation pit, thus saving the cost; and the data collection device and the data analysis device are used for automatically processing data, so that the analysis efficiency is high, the result precision is high, the operation is simple, and the method has a wide application prospect.
(2) Most of existing measuring devices are provided with a plurality of electrodes in the depth direction, only a plurality of observation holes are arranged in the length direction of the waterproof curtain, and due to the limitation of cost and safety, the limitation of the number and the distance of the observation holes is large, so that the testing precision is influenced. The utility model discloses all set up a plurality of electrodes at stagnant water curtain degree of depth and length direction, the electrode on the survey line carries out the data test through selecting different arrangement method, can obtain the condition of abundant electric field information and underground structure, and the measuring accuracy is higher moreover.
(3) The existing measuring device arranges electrodes at the outer side of a waterproof curtain, and for areas with high water level or areas with rapid groundwater replenishment, the difference of the resistivity values measured before and after precipitation is not large, and the defects that the resistivity abnormal area is a measurement error or a waterproof system are not easy to distinguish. The utility model discloses with the electrode setting in the waterproof curtain system, the change of perception resistivity and saturation that can be comparatively sensitive does not receive the influence of outside groundwater moreover.
Drawings
Fig. 1 is a schematic structural view of a water stopping effect evaluation device for a water stopping curtain according to a preferred embodiment of the present invention.
Fig. 2 is a partial schematic view showing the arrangement of the test tube along the length direction of the waterproof curtain according to the preferred embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a test electrode according to a preferred embodiment of the present invention.
Fig. 4 is a schematic view of the overall arrangement of the waterproof curtain, the test tube and the drainage well according to the preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of the testing principle of the wenna method adopted in the electrode testing arrangement of the present invention.
Description of reference numerals:
1-waterproof curtain, 2-test tube, 3-test electrode, 31-electrode rod, 32-electrode nut, 33-fastener, 34-test cable, 4-cable centralized clamping groove, 5-data collecting device, 51-cabinet, 52-cable interface, 53-USB interface, 54-power line, 6-data analyzing device, 7-dry well and 8-inner side of foundation pit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, all belong to the protection scope of the present invention.
Example 1
As shown in fig. 1 to 4, the present invention, in accordance with a preferred embodiment, provides a water stopping effect evaluating apparatus for a water stopping curtain, including: the waterproof curtain 1, a plurality of test tubes 2, a plurality of test electrodes 3, a data collection device 5 and a data analysis device 6. The waterproof curtain 1 is a closed waterproof structure arranged along the periphery of the foundation pit and can be a stirring pile, a high-pressure jet grouting pile, an underground diaphragm wall, a CSM (Carrier sense multiple layer) and a TRD (Top gas recovery device) waterproof structure, and a plurality of dewatering wells 7 are arranged on the inner side 8 of the foundation pit. A plurality of test tubes 2 are pre-embedded in the waterproof curtain 1 at intervals along the circumferential direction of the waterproof curtain 1 and used for fixing the test electrodes 3. Preferably, the test tubes 2 are arranged at equal intervals along the circumferential direction of the waterproof curtain 1, and the interval between two adjacent test tubes 2 is 5-20 m. A plurality of test electrodes 3 are fixed on testing pipe 2 along the length direction interval of testing pipe 2, and every test electrode 3 is including wearing to establish test cable 34 in testing pipe 2, and test cable 34's inside copper core and test electrode 3 effective contact. The data collection device 5 is connected to a test cable 34 for data acquisition. The data analysis device 6 is connected with the data collection device 5 for analyzing the collected data.
In the above solution, the data collection device 5 includes a chassis 51, a cable interface 52, a USB interface 53 and a power line 54, the test cable 34 in the same test tube 2 is connected to the cable interface 52, and the USB interface 53 is connected to the data analysis device 6.
Furthermore, the length of the test tube 2 is smaller than the depth of the waterproof curtain 1, the arrangement of the test tube 2 in the plane direction of the waterproof curtain is deviated to the position in the pit, and the edge of the test tube 2 is 100 mm away from the inner side edge of the waterproof curtain 1 and 200mm away from the inner side edge of the waterproof curtain 1. The distance between the dewatering well 7 close to the periphery of the foundation pit in the foundation pit and the waterproof curtain 1 is less than or equal to 12 m.
Further, the test electrode 3 further comprises an electrode rod 31, an electrode nut 32 and a fastener 33, a through hole penetrating through the electrode rod 31 is formed in the test tube 2, the electrode rod 31 is fixedly connected with the test tube 2 through the electrode nut 32 and the fastener 33 after penetrating through the through hole, and the inner copper core of the test cable 34 is in contact connection with the electrode rod 31 located inside the test tube 2.
Example 2
In a preferred embodiment, at least four test electrodes 3 are arranged on each test tube 2, the test cables 34 in the same test tube 2 are all connected into one cable collecting slot 4, and the test cables 34 in the same test tube 2 are connected into the cable interface 52 through the cable collecting slot 4.
Preferably, the test tube 2 is a hard PVC tube, and the diameter of the test tube 2 is 50-80 mm.
Preferably, the data analysis device 6 is a notebook computer, a desktop computer or a workstation, and the data analysis device 6 is configured to receive the resistance value measured by the test electrode 3 to perform inversion analysis to obtain a resistivity distribution cloud chart, and obtain a three-dimensional distribution cloud chart of the saturation of the waterproof curtain according to the quantitative relationship between the resistivity and the saturation.
Example 3
Specifically, the utility model discloses a concrete construction and evaluation process for stagnant water effect evaluation device of stagnant water curtain as follows: firstly, preparing a test tube 2 and a test electrode 3, fixing the test electrode 3 on the test tube 2 at intervals along the length direction of the test tube 2, then constructing a waterproof curtain 1 along the periphery of a foundation pit, and embedding a plurality of test tubes 2 provided with the test electrodes 3 inside the waterproof curtain 1 at intervals during construction. And then constructing a dredging well 7 in the foundation pit in the maintenance process of the waterproof curtain 1, and taking the dredging well 7 close to the periphery of the foundation pit as a test pumping well. After the waterproof curtain 1 is maintained, connecting the test cable 34 which is arranged in the test tube 2 and is connected with the test electrode 3 with the data collection device 5, carrying out a first test by using the data collection device 5, and calculating the resistivity data of the waterproof curtain before pumping water according to the formula (1). As shown in fig. 5, the electrode test arrangement mode adopts a wenner method with good signal intensity and high sensitivity, a current with a magnitude of I is introduced between the power supply electrodes C1 and C2, and the potential difference Δ U between any two potential electrodes P1 and P2 is measured, so as to obtain a resistivity ρ:
.... the formula (1), wherein ρ is the resistivity of the water curtain, Δ U is the potential difference between any two test electrodes, I is the current passing between the two test electrodes, and K is the electrode coefficient;
and then, carrying out water pumping construction in the foundation pit, carrying out a second test by using the data collection device 5, and calculating the resistivity data of the waterproof curtain after water pumping according to the formula (1). And finally, processing the resistivity data of the water-stopping curtain before and after water pumping by using the data analysis device 6 to obtain a resistivity distribution cloud picture of the water-stopping curtain before and after water pumping, and calculating according to a formula (2) to obtain a saturation three-dimensional distribution cloud picture of the water-stopping curtain.
ρ＝KS-a.... times.formula (2),
where ρ is the resistivity of the water curtain and S is the saturation of the water curtain. The resistivity and the saturation are in a power exponential relation, for a waterproof curtain formed by mixing soil bodies such as cement soil mixing piles, high-pressure jet grouting piles and the like and cement, K is 4-10, and a is-1.3-1.7. For waterproof curtains of concrete walls such as underground continuous walls and the like, the coefficient value is larger, and more accurate numerical values can be obtained through a calibration test.
Further, determining a weak construction position of the waterproof curtain by comparison based on the three-dimensional distribution cloud picture of the saturation of the waterproof curtain, carrying out a third test on a part with a potential infiltration hazard, and encrypting a test interval; the distance between the test tubes 2 selected in the first test is 2-3d, d is the actual embedding distance between the test tubes 2, the distance between the test tubes 2 selected in the second test is 2d, and the distance between the test tubes 2 selected in the third test is d, as shown in fig. 4.
Specifically, the utility model discloses a data processing flow for stagnant water effect evaluation device of stagnant water curtain specifically is:
1) and eliminating abnormal points by using a data filtering program of the data analysis device so as to improve the precision of the inversion data.
2) And performing forward calculation on the acquired test data to obtain three-dimensional apparent resistivity distribution reflecting the comprehensive conductivity of a certain area.
3) And establishing a three-dimensional model in a certain range inside and outside the waterproof curtain through grid calculation according to the electrode coordinate file and the section size of the waterproof curtain.
4) And performing inversion calculation based on a potential mirror image method and a repairing algorithm to obtain the three-dimensional distribution of the resistivity. Weights are assigned according to how sensitive a change in resistivity at a point in space affects voltage measurements within the bulk or at boundaries. And comparing the three-dimensional resistivity distribution back-calculated potential with the measured value until the error is less than a certain range to obtain a resistivity model.
5) And converting according to the quantitative relation between the resistivity and the saturation to obtain the three-dimensional distribution of the saturation of the waterproof curtain.
6) Slicing is carried out on the three-dimensional resistivity model obtained through inversion by using a Slice3D slicing program to obtain the resistivity distribution of a certain two-dimensional plane, and the resistivity distribution can be drawn for any research plane, so that the method is more intuitive.
In the above scheme, based on the cloud picture of the saturation three-dimensional distribution of the waterproof curtain, the procedure of determining the weak position of the waterproof curtain construction by comparison is as follows: when the foundation ditch precipitation, there is the flood peak difference inside and outside the waterproof curtain, if there is the seepage hidden danger in the waterproof curtain, seepage flow can take place for waterproof curtain defective position under the effect of infiltration, and the resistivity of waterproof curtain itself is very big, but the resistivity of groundwater is low, and the resistivity sudden change can appear in the defective position, and resistivity and saturation have quantitative relation simultaneously, and the change through the saturation can be quantitative the severity of judgement seepage condition. According to the obtained three-dimensional distribution cloud picture of the saturation of the waterproof curtain, the initial state of the waterproof curtain after construction is roughly screened, an area with the saturation obviously higher than that of other positions is found, the leakage position is accurately locked through data after precipitation, and the severity of leakage can be determined according to the increase range of the saturation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A stagnant water effect evaluation device for stagnant water curtain which characterized in that: the water stopping effect evaluation device for the water stopping curtain comprises:
the waterproof curtain (1) is a closed waterproof structure arranged along the periphery of the foundation pit, and a plurality of dredging wells (7) are arranged on the inner side of the foundation pit;
the test tubes (2) are embedded in the waterproof curtain (1) at intervals along the circumferential direction of the waterproof curtain (1);
the test tube (2) is fixed on the test tube (2) at intervals along the length direction of the test tube (2), and each test electrode (3) comprises a test cable (34) penetrating in the test tube (2);
a data collection device (5) connected to the test cable (34);
a data analysis device (6) connected to the data collection device (5);
the plurality of test tubes (2) are arranged at equal intervals along the circumferential direction of the waterproof curtain (1), and the interval between every two adjacent test tubes (2) is 5-20 m.
2. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the data collection device (5) comprises a case (51), a cable interface (52), a USB interface (53) and a power line (54), the test cable (34) in the test tube (2) is completely connected into a cable concentration clamping groove (4), the test cable (34) in the test tube (2) is connected into the cable interface (52) through the cable concentration clamping groove (4), and the USB interface (53) is connected with the data analysis device (6).
3. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the length of the test tube (2) is smaller than the depth of the waterproof curtain (1), the test tube (2) is arranged in the plane direction of the waterproof curtain and is deviated to the position in the pit, and the edge of the test tube (2) is 200mm away from the inner side edge of the waterproof curtain (1).
4. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: test electrode (3) still include electrode bar (31), electrode nut (32) and fastener (33), seted up on test tube (2) and passed the through-hole of electrode bar (31), electrode bar (31) pass behind the through-hole pass through electrode nut (32) and fastener (33) with test tube (2) fixed connection, the inside copper core of test cable (34) with be located electrode bar (31) contact connection inside test tube (2).
5. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the testing electrodes (3) are arranged at equal intervals along the length direction of the testing pipe (2), the interval between every two adjacent testing electrodes (3) is 2-5m, and at least four testing electrodes (3) are arranged on each testing pipe (2).
6. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the test tube (2) is a hard PVC tube, and the diameter of the test tube (2) is 50-80 mm.
7. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the distance between the dewatering well (7) close to the periphery of the foundation pit and the waterproof curtain (1) in the foundation pit is smaller than or equal to 12 m.
8. The water stopping effect evaluation device for a water stopping curtain according to claim 1, wherein: the data analysis device (6) is a notebook computer, a desktop computer or a workstation.
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| CN202120339968.2U CN214530738U (en) | 2021-02-05 | 2021-02-05 | A stagnant water effect evaluation device for stagnant water curtain |
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