CN114136558A - Sonar seepage detection method for underground diaphragm wall of deep foundation pit near subway - Google Patents
Sonar seepage detection method for underground diaphragm wall of deep foundation pit near subway Download PDFInfo
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- 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Abstract
The application relates to the technical field of foundation pit construction engineering, in particular to a sonar seepage detection method for an underground diaphragm wall of a subway deep foundation pit, which comprises the following steps: s1: arranging detection holes, and excavating a plurality of detection holes on the outer side of the diaphragm wall close to the subway according to the requirements of a drawing; s2: arranging detection pipes, respectively placing the detection pipes in the detection holes, and arranging water permeable holes on the pipe walls of the detection pipes; s3: pumping underground water in the foundation pit; s4: detecting, namely placing detection equipment in the detection pipe for detection, and observing data of the equipment, wherein the equipment adopts a three-dimensional flow velocity vector measuring instrument; s5: and analyzing, namely analyzing the position of a leakage point of the continuous wall according to the detected data, and plugging. The method and the device have the effect of improving the accuracy and efficiency of judging the leakage position of the underground diaphragm wall.
Description
Technical Field
The application relates to the technical field of foundation pit construction engineering, in particular to a sonar seepage detection method for an underground diaphragm wall of a subway deep foundation pit.
Background
With the continuous development of China in the aspect of urban construction, pavement space resources are developed and utilized on a large scale, and the demand for developing and utilizing underground space is increased. In recent years, the construction requirements of underground diaphragm walls are continuously increased while urban underground space engineering is gradually increased, especially subway engineering is rapidly developed. The underground continuous wall infiltration detection method has the advantages that abundant underground water is often accompanied in many complex geological conditions, great influence is brought to engineering construction, the road surface is collapsed and inclined due to improper treatment, the dangerous conditions such as differential settlement, cracking, inclination and even collapse of buildings are caused, great loss is caused economically, the safety of people nearby is threatened, and the underground continuous wall infiltration detection method has great significance for underground continuous wall infiltration detection in subway engineering.
The traditional investigation method is generally used for observing the height difference of a water level in a water level observation well by relying on the water level observation well arranged outside a foundation pit for the permeation situation of the underground diaphragm wall, the observation result is relatively rough, or the condition of leakage is observed after the foundation pit is excavated, so that the safety of the foundation pit is not facilitated.
With the development and application of the sonar method in the aspect of groundwater seepage detection in recent years, the seepage situation of groundwater can be detected through related instruments, but an analysis method for judging and evaluating the overall permeability of the underground continuous wall is still lacked at present, so that the most appropriate coping construction method for the overall permeability situation of the underground continuous wall is difficult to perform, the construction of buildings in foundation pits is influenced, the construction of subways is influenced, and a large economic cost loss is caused.
Disclosure of Invention
In order to improve accuracy and efficiency of underground continuous wall leakage department judgement, this application provides a sonar seepage flow detection method who faces subway deep basal pit underground continuous wall.
The application provides a sonar seepage flow detection method who faces subway deep basal pit underground continuous wall adopts following technical scheme:
a sonar seepage detection method for an underground diaphragm wall of a deep foundation pit near a subway comprises the following steps:
s1: arranging detection holes, and excavating a plurality of detection holes on the outer side of the diaphragm wall close to the subway according to the requirements of a drawing;
s2: arranging detection pipes, respectively placing the detection pipes in the detection holes, and arranging water permeable holes on the pipe walls of the detection pipes;
s3: pumping underground water in the foundation pit;
s4: detecting, namely placing detection equipment in the detection pipe for detection, and observing data of the equipment, wherein the equipment adopts a three-dimensional flow velocity vector measuring instrument;
s5: analyzing and plugging, analyzing the position of a leakage point of the continuous wall according to the detected data, and plugging.
By adopting the technical scheme, when the method is used for detecting the leakage points of the diaphragm wall, firstly, a plurality of detection holes are dug at the outer side of the diaphragm wall close to the subway so as to accurately determine the positions of the leakage points and facilitate later repair, secondly, a detection pipe for detecting the leakage water is placed in the detection hole and inserted into the detection hole, and a plurality of detection holes are formed in the peripheral surface of the detection hole so that underground water can enter the detection pipe, so that a worker can conveniently detect the flow direction and the flow rate of the underground water through equipment, then, at a construction site, the worker pumps the accumulated water in the foundation pit so as to form a liquid level height difference between the inside and the outside of the foundation pit, if leakage exists, a water flow difference between the inside and the outside of the foundation pit can be generated, then, the detection equipment is placed in the detection pipe for detection, and in the detection process, the three-dimensional flow velocity vector measuring instrument can detect the flow direction and the flow velocity of the water on each high-leakage point, finally, according to the measured data, a plugging measure can be taken in advance, so that by adopting the detection method, the detection efficiency of the water seepage point can be improved, the detection accuracy can be improved, the leakage point can be plugged by workers in time, and safety accidents are avoided.
Optionally, in step S1, the detection hole is disposed between two adjacent diaphragm walls, and the axis of the detection hole is not inclined by more than 3 degrees.
Through adopting above-mentioned technical scheme, because the degree of depth of inspection hole is the same with the degree of depth of diaphragm wall, all is greater than the degree of depth of foundation ditch, when drilling, if the axis slope of inspection hole is greater than 3 degrees, can lead to follow-up installation detecting tube to appear the difficulty, leads to the detecting tube can not install exact position department, can not be better detect the position of infiltration to the data that make to detect out are inaccurate, are unfavorable for the staff to carry out subsequent protection.
Optionally, in step S1, a hole cover is disposed at an upper end of the detection hole.
Through adopting above-mentioned technical scheme, the handhole door that sets up in the drill way department of inspection hole can prevent debris such as job site stone from falling into in the inspection hole, influencing the installation of follow-up test tube.
Optionally, in step S2, the detection tube is formed by splicing multiple sections, and the porosity of the water permeable holes formed in each section of the detection tube is greater than 20%.
By adopting the technical scheme, the depth of the detection hole is deeper and is the same as that of the continuous wall, and the whole detection pipe is inconvenient to transport and install, so that the detection pipe is formed by splicing a plurality of sections, and the installation efficiency can be improved; the permeable holes arranged on the detection pipe can enable underground water to normally flow into the detection pipe, and the detection equipment can accurately measure the flow direction and the flow speed of the underground water.
Optionally, in step S2, the lower port of the detection tube is closed, and a gauze filter screen covering the water permeable hole is disposed on the outer wall of the detection tube.
By adopting the technical scheme, the lower end of the detection pipe is closed, so that underground water can be prevented from entering the detection pipe from the lower end of the detection pipe, and the accuracy of detecting water seepage from the periphery of the foundation pit to the interior of the foundation pit is improved; the gauze filter screen that sets up on the test tube lateral wall can prevent effectively that soil and stone from flowing into the test tube inside, causes the degree of accuracy decline of detection.
Optionally, in step S4, the three-dimensional flow velocity vector measuring instrument includes a measuring probe, a cable, a laptop and a data collection box, the measuring probe is connected to the data collection box through the cable, and the data collection box is connected to the laptop through the cable, and the measuring probe is inserted into each of the detection tubes for detection.
Through adopting above-mentioned technical scheme, through adopting three-dimensional velocity of flow vector measuring apparatu, when measuring, put into the test tube inside with measuring probe, the in-process of detection, measuring probe can be with the accurate measurement of the flow direction, the speed of flow and the flow of groundwater to input on the notebook computer through the collector, so that the staff can audio-visually see the condition of seepage point infiltration, and can get up the data storage that detects, make things convenient for follow-up detection to accomplish the back, the staff makes complete shutoff scheme to the seepage point.
Optionally, the measuring probe measures the data once every other meter in the detection pipe until the data is measured to the bottom of the detection pipe, and the measured data can be transmitted to a notebook computer.
By adopting the technical scheme, the measuring probe measures the underground water in the detection pipe every other meter, the flowing data of the underground water at each height can be accurately obtained, the detection result is more accurate, and the follow-up plugging of workers is facilitated.
Optionally, the detection time of each detection height of the measuring probe in the detection pipe is one minute.
By adopting the technical scheme, the detection time of each detection height is higher, so that the accuracy of the detection data is higher.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the method is adopted to detect the leakage points of the diaphragm wall, firstly a plurality of detection holes are dug at the outer side of the diaphragm wall close to the subway so as to accurately determine the positions of the leakage points, secondly a detection tube for detecting the water seepage is placed in the detection holes, and a plurality of detection holes are formed on the peripheral surface of the detection holes so that underground water can enter the detection tubes, so that a worker can conveniently detect the flow direction and the flow rate of the underground water through equipment, then at a construction site, the worker pumps out the accumulated water in the foundation pit so as to form a liquid level height difference inside and outside the foundation pit, if the underground water has the leakage, the water flow difference inside and outside the foundation pit can be generated, then the detection equipment is placed inside the detection tubes for detection, and in the detection process, the three-dimensional flow velocity vector measuring instrument can detect the flow direction of the water on each high-level water seepage point and the flow velocity of the water, finally, according to the measured data, a plugging measure can be taken in advance, so that the detection method can improve the detection efficiency of the water seepage point and the detection accuracy, and can timely plug the water seepage point by workers to avoid safety accidents;
2. the gauze filter screen arranged on the side wall of the detection tube can effectively prevent soil and stones from flowing into the detection tube, so that the detection accuracy is reduced;
3. through adopting three-dimensional velocity of flow vector measuring apparatu, when measuring, put into the test tube inside with measuring probe, the in-process of detection, measuring probe can be with the accurate measurement of the flow direction, the speed of flow and the flow of groundwater to input on the notebook computer through the collector, so that the condition of seepage point infiltration can audio-visually be seen to the staff, and can get up the data storage that detects, after convenient follow-up detection was accomplished, the staff made complete protection scheme to the seepage point.
Drawings
FIG. 1 is a diagram of method steps for an embodiment of the present application;
FIG. 2 is a schematic view of a detector tube according to an embodiment of the present application.
Description of reference numerals: 1. a detection tube; 2. water permeable holes; 3. and (5) filtering the gauze by using a gauze filter screen.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a sonar seepage detection method for an underground diaphragm wall of a deep foundation pit of a subway. Referring to fig. 1, a sonar seepage detection method for an underground diaphragm wall near a deep foundation pit of a subway comprises the following steps:
s1: arranging a detection hole;
excavating a plurality of detection holes at the outer side of the continuous wall on one side of the foundation pit close to the subway, excavating the detection holes at the positions of the detection holes according to the requirements of design drawings, wherein the excavated detection holes are close to the joint of two adjacent continuous walls and are used for detecting that underground water leaks into the foundation pit from the joint of the two adjacent continuous walls; when the detection hole is excavated, the excavation requirement of the detection hole is basically consistent with the requirement of hydrogeology pore-forming, in order to ensure that the specific position of a water seepage point is detected, the detection hole should be close to the joint of two adjacent continuous walls as far as possible, and the excavation depth of the detection hole is the same as the depth of the continuous walls.
When excavating the inspection hole, adopt the engineering driller to excavate, the diameter of excavation inspection hole must not be less than 150mm to when excavating the inspection hole, drill hole with the clear water, do not need to put talcum powder in the inspection hole, the straightness that hangs down of inspection hole must not be greater than 3 degrees, at the in-process of drilling, can not take place stifled hole and card hole in the inspection hole, prevents that the inspection hole from being destroyed.
After the detection hole is excavated to the position with the same depth as the continuous wall, the detection hole is cleaned and clean water is washed out, so that no precipitate exists in the hole, the subsequent construction steps are prevented from being influenced, and after the detection hole is excavated and cleaned, a hole cover is arranged at the hole opening of the detection hole, so that impurities such as soil, stones and the like on the construction site are prevented from falling into the detection hole, and the subsequent cleaning is inconvenient; after the detection holes in the construction site are completely excavated, workers should measure the elevation of the hole opening of the detection hole and the coordinate position of the hole, and perform uniform quality inspection and acceptance in the period.
S2: arranging a detection tube 1;
all install sense tube 1 in every inspection hole, the lower port of sense tube 1 seals, and the diameter of sense tube 1 is 50-90mm, sense tube 1 adopts the PVC plastic tubing, sense tube 1 is the long sense tube 1 of forming by the 1 end-to-end connection of the little sense tube of multistage length, the form that the concatenation department of multistage sense tube 1 adopted the big pipe to cup joint, multistage sense tube 1 can not have the dislocation in the joint department of concatenation and fall the phenomenon of festival, prevent the in-process of sense tube 1 at the concatenation, the skew angle appears in the axis, the data that lead to examining time measuring appear inaccurately, when 1 concatenation in-process of multistage sense tube, when the festival phenomenon appears, groundwater can take earth and impurity to enter into sense tube 1 inside, cause the data that detect inaccurate.
The wall of each section of the detection pipe 1 is provided with a plurality of groups of water permeable holes 2, the groups of water permeable holes 2 are uniformly distributed along the length direction of the detection pipe 1, two adjacent groups of water permeable holes 2 are arranged in a staggered manner, each group of water permeable holes 2 are uniformly distributed along the axial direction of the detection pipe 1, the groups of staggered water permeable holes 2 arranged on the detection pipe 1 can enable underground water to enter the detection pipe 1 from all directions, the subsequent detection through detection equipment is convenient, and the water permeable holes 2 arranged on the detection pipe 1 are all positioned below the underground water level; the detection tube 1 is provided with water permeable holes 2 with the porosity of more than 20 percent, and the water permeable holes 2 are required to be arranged on the detection tube 1 in a standard, uniform and symmetrical manner; the parcel has two-layer 100 mesh gauze filter screen 3 on the outer wall of test tube 1, and the gauze filter screen 3 of setting can prevent that earth and grit granule on the inspection hole pore wall from entering into inside test tube 1 through hole 2 of permeating water.
After the detection pipe 1 is installed inside the detection hole, the axis of the detection pipe 1 and the axis of the detection hole are coaxially arranged, medium and coarse stone gravels are filled between the outer wall of the detection pipe 1 and the inner wall of the detection hole, the medium and coarse stone gravels are filled between the water permeable hole 2 on the detection pipe 1 and the hole wall of the detection hole, and the arranged medium and coarse stone gravels can prevent soil particle impurities on the hole wall of the detection hole from entering the detection pipe 1 along with the flow of ground water, so that the arranged medium and coarse stone gravels can play a role in filtering; do not seted up the hole of permeating water 2 on the inspection pipe 1 is close to inspection hole upper end open-ended outer wall, it has the clay ball to fill between the pore wall of the pipe wall that does not set up the hole of permeating water 2 here and inspection hole, until filling the position that flushes with ground, the clay ball of setting can prevent that impurity from falling into the gap between inspection pipe 1 and the inspection hole.
S3: pumping underground water in the foundation pit;
after the steps S1 and S2 are completed, the staff lowers the water level in the foundation pit to a position near the foundation pit excavation bottom plate required by sonar detection through the dewatering well, the water level in the foundation pit is continuously maintained, and after the pumping work in the foundation pit is completed for 24 hours, the detection is started, and the underground water outside the foundation pit can enter the detection pipe 1 because the underground water inside and outside the foundation pit forms a liquid level difference.
S4: detecting;
the method comprises the following steps that detection equipment is placed in a detection tube 1 for detection, data detected in the detection tube 1 are detected by a three-dimensional flow velocity vector measuring instrument, the three-dimensional flow velocity vector measuring instrument comprises a measuring probe, a cable, a notebook computer and a data acquisition box, the measuring probe is connected with the data acquisition box through the cable, and the data acquisition box is connected with the notebook computer through the cable; the working principle of the three-dimensional flow velocity vector measuring instrument is that detection is carried out through sonar, and the sonar is an underwater unique physical measuring method capable of carrying out information detection, identification, navigation and communication. Based on the technical fusion of the 'double electric layer seismoelectric theory' and the 'sonar seepage flow measuring method', a sonar vector acceleration detection technology, an aviation orientation technology, a pressure conduction technology, a hydrogeological simulation calculation technology, a GPS positioning technology, a computer big data analysis imaging technology, a wireless communication network technology and a visual imaging system for displaying, storing and printing the movement speed and the vector of the water flow particle are established. The three-dimensional flow velocity vector sonar measuring instrument is based on a sonar vector acceleration three-axis detector array, and can be used for accurately measuring the size and distribution of energy transmission of sound waves in a fluid. The sonar vector acceleration sensor automatically senses and identifies the movement speed and direction of a fluid space, and automatically generates various hydrogeological parameter charts required by underground engineering according to data acquisition of the corresponding leakage defect coordinate position and original analysis model imaging.
During detection, a measuring probe is placed inside the detecting tube 1, and measured data are transmitted to a notebook computer; before the equipment is used for measurement, firstly, an indoor standard seepage test well is used for seepage parameter marking, then on-site seepage measurement can be carried out, before outdoor test measurement, after a measuring instrument is electrified and preheated for 3 minutes, a measuring probe is put into a detection pipe 1 for formal measurement, the measurement sequence is from top to bottom, the measurement is started from the position below the underground water level, the density of the measuring points is 1M, the measurement time of one measuring point is one minute, the measurement is finished after waiting for 60 seconds, the measured data is automatically stored in an electronic document, and the measurement of the next measuring point is carried out until the bottom of a hole is measured.
S5: analyzing and plugging;
according to the data detected in the step S4, the method helps workers to accurately determine the position of the leakage point, and a detailed plugging scheme is manufactured according to the position of the leakage point, meanwhile, on the premise of ensuring the smooth construction of the foundation pit, the optimal design, construction and prediction of the underground water-stopping structure become possible, so that managers at all levels have a plurality of centers, blindness is avoided, and scientific and management innovation is realized.
The sonar seepage detection method for the underground diaphragm wall facing the subway deep foundation pit comprises the following steps: a plurality of inspection holes are excavated in the outside of being close to the diaphragm wall in the foundation ditch outside, install the detecting tube 1 in the inspection hole after that, seted up a plurality of holes 2 of permeating water on the wall of the detecting tube 1 of installation, groundwater can enter into inside the detecting tube 1, secondly, put into the detecting tube 1 with measuring probe, measure once every one section distance, after the measurement is accomplished, the staff carries out analysis and judgement according to measured data, formulate the shutoff scheme to the position of seepage point.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A sonar seepage detection method for an underground diaphragm wall of a deep foundation pit near a subway is characterized by comprising the following steps: the method comprises the following steps:
s1: arranging detection holes, and excavating a plurality of detection holes on the outer side of the diaphragm wall close to the subway according to the requirements of a drawing;
s2: arranging detection tubes (1), respectively placing the detection tubes (1) in the detection holes, and arranging water permeable holes (2) on the tube walls of the detection tubes (1);
s3: pumping underground water in the foundation pit;
s4: detecting, namely placing detection equipment in the detection tube (1) for detection, and observing data of the equipment, wherein the equipment adopts a three-dimensional flow velocity vector measuring instrument;
s5: analyzing and plugging, analyzing the position of a leakage point of the continuous wall according to the detected data, and plugging.
2. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 1, wherein the method comprises the following steps: in the step S1, the detection hole is disposed between two adjacent diaphragm walls, and the inclination of the axis of the detection hole is not greater than 3 degrees.
3. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 1, wherein the method comprises the following steps: in the step S1, a hole cover is disposed at the upper end of the detection hole.
4. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 1, wherein the method comprises the following steps: in the step S2, the detection tube (1) is formed by splicing multiple sections, and the porosity of the water permeable holes (2) formed in each section of the detection tube (1) is more than 20%.
5. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 1, wherein the method comprises the following steps: in the step S2, the lower port of the detection tube (1) is closed, and a gauze filter screen (3) covering the water permeable holes (2) is arranged on the outer wall of the detection tube (1).
6. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 1, wherein the method comprises the following steps: in the step S4, the three-dimensional flow velocity vector measuring instrument is composed of a measuring probe, a cable, a laptop and a data collection box, wherein the measuring probe is connected with the data collection box through the cable, and the data collection box is connected with the laptop through the cable, and the measuring probe is inserted into each detection tube (1) for detection.
7. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 6, wherein: the measuring probe measures once every other meter in the detecting tube (1) until the measuring probe measures to the bottom of the detecting tube (1), and measured data can be transmitted to a notebook computer.
8. The sonar seepage detection method for the underground diaphragm wall of the deep foundation pit of the subway according to claim 6, wherein: the detection time of the measuring probe at each detection height in the detection tube (1) is one minute.
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Application publication date: 20220304 |