CN111535373A - Deep foundation pit water-proof curtain leakage detection method - Google Patents
Deep foundation pit water-proof curtain leakage detection method Download PDFInfo
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- CN111535373A CN111535373A CN202010395436.0A CN202010395436A CN111535373A CN 111535373 A CN111535373 A CN 111535373A CN 202010395436 A CN202010395436 A CN 202010395436A CN 111535373 A CN111535373 A CN 111535373A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention provides a method for detecting leakage of a waterproof curtain of a deep foundation pit, which comprises the following specific steps of: dividing a working area, namely dividing a detection working area of a foundation pit waterproof curtain structure; arranging basic equipment, and installing an in-well observation electrode and an out-of-well observation electrode; and step three, detection work is carried out, the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is detected and recorded before and after precipitation, and the change of the resistivity before and after precipitation is compared. The method can judge the position of the leakage point of the waterproof curtain, and the waterproof curtain is not damaged by the method, so that the engineering quality is improved; the measurement part does not need to be embedded, the detection equipment can be repeatedly used, and the construction cost is reduced; the resistivity of the waterproof curtain and the soil is comprehensively considered, and the detection precision is improved.
Description
Technical Field
The invention relates to the technical field of deep foundation pit construction detection, in particular to a method for detecting leakage of a waterproof curtain of a deep foundation pit.
Background
In the prior art, a drilling coring method and an acoustic transmission method are generally adopted as a method for detecting leakage of a waterproof curtain in deep foundation pit construction, and an electroosmosis method is adopted by individual construction units. The above three methods mainly have the following defects:
1. when the drilling coring method is adopted, the waterproof curtain is damaged to reduce the engineering quality, if too many sampling points are used, the influence on the engineering quality is large, and if too few sampling points are used, the purpose of comprehensively reflecting the detection result cannot be achieved;
2. the acoustic transmission method needs to embed the measuring tube in advance, so that the construction cost is increased;
3. the electroosmosis method has the advantages of relatively single observation point type and low detection precision.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for detecting the leakage of a waterproof curtain of a deep foundation pit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting leakage of a waterproof curtain of a deep foundation pit comprises the following specific steps:
step one, dividing a working area,
dividing a detection working area of the foundation pit waterproof curtain structure, and marking the position of an observation point in the corresponding working area;
step two, arranging basic equipment,
installing an in-well observation electrode at the observation point position marked in the first step at the inner side of the well of the waterproof curtain, and installing an out-of-well observation electrode at the corresponding position which is equidistant from the in-well observation electrode outside the well;
step three, the detection work is carried out,
before and after precipitation, respectively detecting and recording the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, comparing the change of the resistivity before and after precipitation, and if the change between two adjacent in-well observation electrodes of a certain observation point and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is larger, judging that a larger leakage risk exists; if only one of the resistivities has large change, retesting is carried out, and if the retesting result is not changed, manual active tracking is carried out for confirmation.
Further, the division of the detection working area in the step one adopts the principle of uniform division, the whole waterproof curtain is divided into a plurality of rectangular units, and the area deviation of each rectangular unit is +/-1 m2Within.
Further, the foundation pit needs to be processed before detection, and the method mainly comprises the following steps: the ground surface in the foundation pit is flat land and free of foreign matters such as stones and metals; and (4) detecting that no soil is covered on the upper part of the waterproof curtain structure in the working area, and the surface is dry.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the observation electrodes in two adjacent wells is 0.2-1.5 m.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the outdoor observation electrode and the outer wall of the waterproof curtain is 0.8-1.2 m.
Further, the detection method in the third step comprises: and connecting the positive electrode and the negative electrode of the resistivity testing equipment with the electrode to be tested in turn and reading.
The invention has the beneficial effects that: according to the method, the positions of the leakage points of the waterproof curtain can be judged by detecting and comparing the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, and the waterproof curtain is not damaged in such a way, so that the engineering quality is improved; the measurement part does not need to be embedded, the detection equipment can be repeatedly used, and the construction cost is reduced; the resistivity of the waterproof curtain and the soil is comprehensively considered, and the detection precision is improved.
Detailed Description
The invention is further illustrated by the following examples:
example one
A method for detecting leakage of a waterproof curtain of a deep foundation pit comprises the following specific steps:
step one, dividing a working area,
dividing a detection working area of the foundation pit waterproof curtain structure, and marking the position of an observation point in the corresponding working area;
step two, arranging basic equipment,
installing an in-well observation electrode at the observation point position marked in the first step at the inner side of the well of the waterproof curtain, and installing an out-of-well observation electrode at the corresponding position which is equidistant from the in-well observation electrode outside the well;
step three, the detection work is carried out,
before and after precipitation, respectively detecting and recording the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, comparing the change of the resistivity before and after precipitation, and if the change between two adjacent in-well observation electrodes of a certain observation point and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is larger, judging that a larger leakage risk exists; if only one of the resistivities has large change, retesting is carried out, and if the retesting result is not changed, manual active tracking is carried out for confirmation.
Further, the division of the detection working area in the step one adopts the principle of uniform division, the whole waterproof curtain is divided into a plurality of rectangular units, and the area deviation of each rectangular unit is +/-1 m2Within.
Further, the foundation pit needs to be processed before detection, and the method mainly comprises the following steps: the ground surface in the foundation pit is flat land and free of foreign matters such as stones and metals; and (4) detecting that no soil is covered on the upper part of the waterproof curtain structure in the working area, and the surface is dry.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the observation electrodes in two adjacent wells is 0.2 m.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the outdoor observation electrode and the outer wall of the waterproof curtain is 0.8 m.
Further, the detection method in the third step comprises: and connecting the positive electrode and the negative electrode of the resistivity testing equipment with the electrode to be tested in turn and reading.
According to the method, the positions of the leakage points of the waterproof curtain can be judged by detecting and comparing the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, and the waterproof curtain is not damaged in such a way, so that the engineering quality is improved; the measurement part does not need to be embedded, the detection equipment can be repeatedly used, and the construction cost is reduced; the resistivity of the waterproof curtain and the soil is comprehensively considered, and the detection precision is improved.
Example two
A method for detecting leakage of a waterproof curtain of a deep foundation pit comprises the following specific steps:
step one, dividing a working area,
dividing a detection working area of the foundation pit waterproof curtain structure, and marking the position of an observation point in the corresponding working area;
step two, arranging basic equipment,
installing an in-well observation electrode at the observation point position marked in the first step at the inner side of the well of the waterproof curtain, and installing an out-of-well observation electrode at the corresponding position which is equidistant from the in-well observation electrode outside the well;
step three, the detection work is carried out,
before and after precipitation, respectively detecting and recording the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, comparing the change of the resistivity before and after precipitation, and if the change between two adjacent in-well observation electrodes of a certain observation point and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is larger, judging that a larger leakage risk exists; if only one of the resistivities has large change, retesting is carried out, and if the retesting result is not changed, manual active tracking is carried out for confirmation.
Further, the division of the detection working area in the step one adopts the principle of uniform division, the whole waterproof curtain is divided into a plurality of rectangular units, and the area deviation of each rectangular unit is +/-1 m2Within.
Further, the foundation pit needs to be processed before detection, and the method mainly comprises the following steps: the ground surface in the foundation pit is flat land and free of foreign matters such as stones and metals; and (4) detecting that no soil is covered on the upper part of the waterproof curtain structure in the working area, and the surface is dry.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the observation electrodes in two adjacent wells is 1.5 m.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the outdoor observation electrode and the outer wall of the waterproof curtain is 1.2 m.
Further, the detection method in the third step comprises: and connecting the positive electrode and the negative electrode of the resistivity testing equipment with the electrode to be tested in turn and reading.
According to the method, the positions of the leakage points of the waterproof curtain can be judged by detecting and comparing the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, and the waterproof curtain is not damaged in such a way, so that the engineering quality is improved; the measurement part does not need to be embedded, the detection equipment can be repeatedly used, and the construction cost is reduced; the resistivity of the waterproof curtain and the soil is comprehensively considered, and the detection precision is improved.
EXAMPLE III
A method for detecting leakage of a waterproof curtain of a deep foundation pit comprises the following specific steps:
step one, dividing a working area,
dividing a detection working area of the foundation pit waterproof curtain structure, and marking the position of an observation point in the corresponding working area;
step two, arranging basic equipment,
installing an in-well observation electrode at the observation point position marked in the first step at the inner side of the well of the waterproof curtain, and installing an out-of-well observation electrode at the corresponding position which is equidistant from the in-well observation electrode outside the well;
step three, the detection work is carried out,
before and after precipitation, respectively detecting and recording the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, comparing the change of the resistivity before and after precipitation, and if the change between two adjacent in-well observation electrodes of a certain observation point and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is larger, judging that a larger leakage risk exists; if only one of the resistivities has large change, retesting is carried out, and if the retesting result is not changed, manual active tracking is carried out for confirmation.
Further, the division of the detection working area in the step one adopts the principle of uniform division, the whole waterproof curtain is divided into a plurality of rectangular units, and the area deviation of each rectangular unit is +/-1 m2Within.
Further, the foundation pit needs to be processed before detection, and the method mainly comprises the following steps: the ground surface in the foundation pit is flat land and free of foreign matters such as stones and metals; and (4) detecting that no soil is covered on the upper part of the waterproof curtain structure in the working area, and the surface is dry.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the observation electrodes in two adjacent wells is 0.8 m.
Furthermore, when the observation electrodes are arranged in the second step, the distance between the outdoor observation electrode and the outer wall of the waterproof curtain is 0.9 m.
Further, the detection method in the third step comprises: and connecting the positive electrode and the negative electrode of the resistivity testing equipment with the electrode to be tested in turn and reading.
According to the method, the positions of the leakage points of the waterproof curtain can be judged by detecting and comparing the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, and the waterproof curtain is not damaged in such a way, so that the engineering quality is improved; the measurement part does not need to be embedded, the detection equipment can be repeatedly used, and the construction cost is reduced; the resistivity of the waterproof curtain and the soil is comprehensively considered, and the detection precision is improved.
The present invention has been described in connection with the specific embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and it is within the protection scope of the present invention as long as various modifications are made by using the method concept and technical solution of the present invention, or the present invention is directly applied to other occasions without modification.
Claims (6)
1. A method for detecting leakage of a waterproof curtain of a deep foundation pit is characterized by comprising the following specific steps:
step one, dividing a working area,
dividing a detection working area of the foundation pit waterproof curtain structure, and marking the position of an observation point in the corresponding working area;
step two, arranging basic equipment,
installing an in-well observation electrode at the observation point position marked in the first step at the inner side of the well of the waterproof curtain, and installing an out-of-well observation electrode at the corresponding position which is equidistant from the in-well observation electrode outside the well;
step three, the detection work is carried out,
before and after precipitation, respectively detecting and recording the resistivity between two adjacent in-well observation electrodes and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode, comparing the change of the resistivity before and after precipitation, and if the change between two adjacent in-well observation electrodes of a certain observation point and between the corresponding in-well observation motor and the corresponding out-of-well observation electrode is larger, judging that a larger leakage risk exists; if only one of the resistivities has large change, retesting is carried out, and if the retesting result is not changed, manual active tracking is carried out for confirmation.
2. The method for detecting the leakage of the deep foundation pit waterproof curtain according to claim 1, wherein the division of the detection working area in the step one adopts a uniform division principle to divide the whole waterproof curtain into a plurality of rectangular units, and the area deviation of each rectangular unit is +/-1 m2Within.
3. The method for detecting the leakage of the deep foundation pit waterproof curtain according to claim 1, wherein the foundation pit needs to be treated before detection, and the method mainly comprises the following steps: the ground surface in the foundation pit is flat land and free of foreign matters such as stones and metals; and (4) detecting that no soil is covered on the upper part of the waterproof curtain structure in the working area, and the surface is dry.
4. The method for detecting the leakage of the deep foundation pit waterproof curtain according to claim 1, wherein when the observation electrodes are arranged in the second step, the distance between the observation electrodes in two adjacent wells is 0.2-1.5 m.
5. The method for detecting the leakage of the waterproof curtain of the deep foundation pit according to claim 1, wherein when the observing electrodes are arranged in the second step, the distance between the outdoor observing electrode and the outer wall of the waterproof curtain is 0.8-1.2 m.
6. The method for detecting the leakage of the deep foundation pit water-resisting curtain according to claim 1, wherein the detection method in the third step is as follows: and connecting the positive electrode and the negative electrode of the resistivity testing equipment with the electrode to be tested in turn and reading.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112985718A (en) * | 2021-02-05 | 2021-06-18 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation system and method based on high-density resistivity method |
| CN116858749A (en) * | 2023-07-26 | 2023-10-10 | 北京建工环境修复股份有限公司 | Determination method for relationship between barrier curtain complex resistivity signal and permeability |
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Application publication date: 20200814 |