A tidal flat sampling detection device and detection method

Abstract

The present invention belongs to the technical field of beach detection equipment, and specifically relates to a beach sampling detection equipment and a detection method. The equipment comprises a propulsion cylinder and a sampling cylinder arranged in the propulsion cylinder, and also comprises a plurality of partition components, wherein the partition components comprise a plurality of elastic sheets, and the fixed ends of the plurality of elastic sheets are respectively installed on the inner wall of the sampling cylinder; and also comprises a pressure regulating component, through which the pressure of different sampling chambers is controlled, and the sampling cylinder is divided into different sampling chambers by the partition component, and the pressure of each sampling chamber is controlled by the designed pressure regulating component, and the adsorption of soil layer samples in each chamber is achieved by extracting the gas in each sampling chamber, thereby reducing the flow of soil layer samples between each chamber; and then the controller improves the control of the pressure of each sampling chamber through the detected pressure data, so as to ensure that the pressure of each sampling chamber is sufficient to limit the position of the soil layer sample in each sampling chamber, and at the same time ensure the integrity of the soil layer sample.

Description

Technical Field

[0001] The invention belongs to the technical field of tidal flat detection equipment, and in particular relates to a tidal flat sampling detection equipment and a detection method. Background Art

[0002] When carrying out construction on tidal flats near water, it is necessary to conduct sampling inspections on the stratum structure of the tidal flats, understand the stratum structure data of a certain depth of the tidal flats, and calculate and analyze the settlement risk and pile foundation parameters based on the obtained stratum structure data of the tidal flats.

[0003] The common method of stratum sampling is drilling sampling, that is, drilling to a certain depth underground and encapsulating stratum samples at each depth in a sampling tube and extracting them to the surface. The samples retrieved by the sampling tube can reflect the stratum cross section at the sampling depth. By analyzing the cross section, the geological structure at the sampling depth can be determined, and further relevant construction data can be obtained.

[0004] However, tidal flats are essentially different from inland areas. The geological layers in inland areas have been formed for a long time and have a stable structure. During the sampling and returning to the ground, their layout in the stratum can be completely preserved, thus obtaining accurate analysis results. Most tidal flats are formed by water erosion. Their strata may be solid rock and soil structures, or they may be sand and gravel accumulation structures formed by recent deposition. In addition, the stratum structure near water is greatly affected by water infiltration. During the sampling and returning to the ground, the samples stored in the sampling tube will be loose and unformed, which will cause the results of the test analysis to deviate from the actual stratum structure of the tidal flat, increase the difficulty of construction and create the risk of accidents.

[0005] Therefore, there is an urgent need for a sampling technology suitable for tidal flats that can accurately sample and analyze loose and shapeless samples to reduce construction risks. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a tidal flat sampling detection device and a detection method.

[0007] In order to achieve the purpose of the present invention, the following technical scheme is proposed: a tidal flat sampling detection device, comprising a propulsion cylinder and a sampling cylinder arranged in the propulsion cylinder, and also comprising a plurality of partition components;

[0008] Any of the partition components comprises a pair of elastic sheets symmetrically arranged about the central axis of the sampling tube, and the fixed ends of the plurality of elastic sheets are respectively mounted on the inner side walls of the sampling tube;

[0009] The plurality of elastic sheets divide the sampling barrel into a plurality of sampling chambers to block the flow of samples stored in each sampling chamber, and the elastic sheets are opened during the sampling process and closed after the sampling is completed;

[0010] A pressure regulating assembly is provided on one side of the inner cavity of the propulsion cylinder. The pressure regulating assembly includes a vacuum pump and a controller. The controller controls the vacuum pump to evacuate each sampling chamber respectively to control the pressure of different sampling chambers.

[0011] Preferably, the pressure regulating assembly includes a pressure regulating chamber, the inlet end of the vacuum pump is arranged in the pressure regulating chamber, a plurality of pressure regulating ports are arranged on the side wall of the pressure regulating chamber, the plurality of pressure regulating ports are respectively connected to a plurality of sampling chambers one by one, and the inner diameter of the pressure regulating chamber is arranged to increase sequentially from top to bottom.

[0012] Preferably, it also includes a filter screen, which is arranged at the inlet end of the vacuum pump and is used to filter the gas entering the vacuum pump.

[0013] Preferably, it also includes a detection component connected to the controller, the detection component also includes an inclination sensor and a pressure sensor, the pressure sensor is used to measure the pressure on the elastic sheet during sampling, and the inclination sensor is used to identify the inclination angle of the elastic sheet.

[0014] Preferably, the detection component includes a position sensor;

[0015] The position sensor is electrically connected to the controller, and when the propulsion tube is lifted, the position sensor is used to detect the position of the sample in each sampling chamber;

[0016] The controller adjusts the operation of the vacuum pump according to the data uploaded by the position sensor.

[0017] Preferably, it also includes a scale arranged on the outer side wall of the propulsion cylinder.

[0018] A tidal flat sampling detection method comprises the following steps:

[0019] S1: Select a suitable sampling location and arrange the sampling device;

[0020] S2: The propulsion tube is pushed downward, and the soil layer pushes the elastic sheet upward to deform and enter the sampling tube, and the propulsion tube reaches a specific depth;

[0021] S3: Open the pressure regulating assembly, and the controller adjusts the pressure of the sampling chamber through the data uploaded by the pressure detector of the pressure regulating port, the pressure detection sensor of the elastic sheet, and the inclination sensor, and the elastic sheet rebounds and resets, and at the same time lifts the propulsion cylinder;

[0022] S4: The lifting of the propulsion tube is completed and the sampling is finished.

[0023] Preferably, the method for calculating the ideal value of the specific depth of the propulsion tube in step S2 is: combining the sequence of multiple inclination angles α uploaded by the inclination sensor {α 1 , α 2 , α 3,···,α n}, n is the number of sampling chambers containing samples, and the height sequence of soil samples in each sampling chamber is {h 1 ,h 2 ,h 3 ,···,h n}, the length of the elastic sheet is l, then the ideal depth value of the sample is .

[0024] The beneficial effects of the present invention are:

[0025] The pressure of different sampling chambers is controlled by the pressure regulating assembly, and the sampling tube is separated into different sampling chambers by the interlayer assembly. The pressure of each sampling chamber is controlled by the designed pressure regulating assembly, and the soil samples in each chamber are adsorbed by extracting the gas in each sampling chamber, thereby reducing the flow of soil samples between each chamber; and the controller can improve the control of the pressure of each sampling chamber through the detected pressure data, so as to ensure that the pressure of each sampling chamber is sufficient to limit the position of the soil sample in each sampling chamber, and at the same time ensure the integrity of the soil sample. The effect of the soft and unformed soil structure of the tidal flat on the sampling process is effectively solved, and the accuracy and representativeness of the sampling are improved. Then, by setting the filter net, the impurities, particulate matter and moisture carried by the gas entering the vacuum pump from each sampling chamber are filtered to reduce the maintenance frequency and replacement cycle of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1 It is a schematic cross-sectional view of the sampling tube of the present invention;

[0028] Main component symbols

[0029] In the figure:

[0030] 1. Pressure regulating chamber; 2. Elastic sheet; 3. Sampling chamber; 4. Filter screen. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0032] See also Figure 1, when constructing on the tidal flat near water, it is necessary to sample and test the stratigraphic structure of the tidal flat to understand the stratigraphic structure data of a certain depth of the tidal flat, and calculate and analyze the settlement risk and pile foundation parameters based on the stratigraphic structure data of the tidal flat. However, the tidal flat is usually located on the edge of the river, lake or ocean, and due to the scouring and erosion of water flow and tide, the binding force between soil particles will be weakened, and the soil structure will become loose. In addition, the change of groundwater level may also lead to the change of soil moisture, which will affect the strength and stability of the soil. Therefore, when the sampling device returns to the ground, the samples stored in the sampling tube will be loose and unformed, and the samples at various depths will move. For example, if the upper soil moisture within a certain depth range is large and there is water seepage, it will affect the soil layer structure close to it, and then the sample cannot truly reflect the soil layer structure at each depth, causing the results of the detection and analysis to deviate from the actual stratigraphic structure of the tidal flat, increasing the difficulty of construction and the risk of accidents.

[0033] Therefore, this embodiment provides a tidal flat sampling detection device, including a propulsion cylinder and a sampling cylinder arranged in the propulsion cylinder, and also includes a plurality of partition components;

[0034] Any interlayer assembly includes a pair of elastic sheets 2 symmetrically arranged about the central axis of the sampling barrel, and the fixed ends of the plurality of elastic sheets 2 are respectively installed on the inner side wall of the sampling barrel, and there is a certain gap between any pair of elastic sheets 2, and the movable end of any elastic sheet 2 is wrapped with a silicone layer, and the silicone layer is used to improve the sealing between each sampling chamber 3, so that the fluidity of the sample between two adjacent chambers is reduced, thereby realizing the restriction of the position of the sample in each chamber, especially for the pair of elastic sheets 2 at the bottom in the propulsion direction of the propulsion barrel, it is necessary to make the two symmetrical elastic sheets 2 able to achieve the sealing of the bottom of the sampling barrel in the reset state, so as to facilitate the subsequent pressure regulation of the pressure regulating assembly;

[0035] When sampling, the propulsion tube is pushed downward, and the soil layer pushes the elastic sheet 2 in the sampling tube to deform upward in turn, and the soil layer enters the sampling tube; after the sampling is completed, the driving device lifts the propulsion tube, and the plurality of elastic sheets 2 in the sampling tube are reset to separate the inner cavity of the sampling tube into a plurality of sampling chambers 3 to limit the position of the samples in each sampling chamber 3, thereby preventing the samples of different depths from affecting each other during the process of returning to the ground, so that the samples in the plurality of sampling chambers 3 can more accurately reflect the soil layer conditions at each depth. The driving device for driving the propulsion tube to push downward during sampling and to lift the propulsion tube after the sampling is completed adopts a general driving device or manual propulsion or extraction, which is adjusted according to the specific construction needs;

[0036] As mentioned above, due to the differences in the properties of the soil layers at different depths in the tidal flat, when using a vacuum pump to perform negative pressure adsorption operations on it, the pressures required to be applied to different sampling chambers 3 are inconsistent, so the effect of using only the elastic sheet 2 to isolate the soil layers of each chamber needs to be improved, so it also includes a pressure regulating component, the pressure regulating component includes a vacuum pump, a pressure regulating chamber 1, and a pressure regulating port connected to different sampling chambers 3 arranged on the pressure regulating chamber 1, and also includes a controller for controlling the pressure of the pressure regulating chamber 1, the operation of the vacuum pump and the size of the pressure regulating port. The controller controls the pressure of different sampling chambers 3 by adjusting the size of each pressure regulating port, and adjusts it by setting an electromagnetic valve on each pressure regulating port. The controller controls the size of the pressure regulating port by controlling the opening size of each solenoid valve. The controller can adjust the switch of each solenoid valve by setting a sensor for detecting the pressure of the pressure regulating port at each pressure regulating port. The controller achieves precise control of the size of each pressure regulating port through the detection data uploaded by each sensor.

[0037] The controller needs to use a sensor for detecting the pressure of the pressure regulating port to detect the pressure of each pressure regulating port, so that the controller can accurately control the pressure in each sampling chamber 3, thereby realizing the control of the adsorption force of the soil layer samples located in each sampling chamber 3 by the pressure of different sampling chambers 3, avoiding the situation that the pressure is too low and cannot be adsorbed or the pressure is too high, which affects the integrity of the samples in each sampling chamber 3.

[0038] This helps the sample to better fit the inner wall of the sampling tube, reduces the relative flow and deformation of samples in different chambers, and reduces the mutual influence of samples between the various sampling chambers, so as to avoid the movement of samples between the various sampling chambers 3 when the cylinder is lifted later. Multiple sampling chambers 3 are used to extract samples at different depths respectively. This design structure is also conducive to subsequent preservation and improves the accuracy and representativeness of sampling.

[0039] Furthermore, since the pressure regulating chamber 1 is arranged along the length direction of the propulsion cylinder, the pressure regulating chamber 1 itself has a certain height, and due to the principle of pressure, in a closed space, the gas density in the pressure regulating chamber 1 will change with the change of height, and the difference in gravity caused by the height will lead to inconsistent pressures at different heights, so the pressures at different heights in the inner cavity of the pressure regulating chamber 1 are also inconsistent. The lower and closer to the center of the earth, the greater the gravity to which the gas in the sampling chamber 3 is subjected. Therefore, the closer to the center of the earth, that is, the lower the sampling chamber 3 is, the greater the pressure. Therefore, in order to balance the pressures at various heights in the inner cavity of the sampling chamber 3, the shape of the sampling chamber 3 is set to a truncated cone shape that increases from top to bottom. The specific design of the diameter size corresponding to each height surface of the truncated cone can be obtained from multiple experiments, so that when each pressure regulating port is closed, the pressures at various heights of the truncated cone-shaped pressure regulating chamber 1 are consistent.

[0040] Furthermore, in order to increase the friction of the sampling barrel, it also includes a friction protrusion arranged on the inner wall of the sampling barrel. Because the elastic sheet 2 itself needs to be deformed to facilitate the entry of the soil layer and needs to be reset when the propulsion barrel is subsequently lifted, in order to prevent the soil from mixing into the interface between the elastic sheet 2 and the sampling barrel, a silicone sealing ring is arranged at the interface between the elastic sheet 2 and the inner wall of the sampling barrel to prevent the soil from entering the propulsion barrel during the propulsion of the propulsion barrel.

[0041] Furthermore, when the pressure of the pressure regulating port is detected so that the controller can adjust the opening size of the solenoid valve of each pressure regulating port, in order to increase the accuracy of the adjustment, a detection component connected to the controller is also included. The detection component also includes an inclination sensor and a pressure sensor. The pressure sensor is used to measure the pressure on the elastic sheet 2 during sampling, and the inclination sensor is used to identify and determine the inclination angle of the elastic sheet 2. The pressure in the sampling chamber 3 is further grasped by the pressure on the elastic sheet 2 and the inclination angle of the elastic sheet 2. If the pressure in the sampling chamber 3 is too low, the pressure cannot adsorb the sample in the sampling chamber 3, causing the sample to be accumulated on the elastic sheet 2 by gravity. Therefore, by detecting the pressure on the elastic sheet 2 and the inclination angle of the elastic sheet 2, it can be obtained that the specific correspondence between the pressure on the elastic sheet 2 and the inclination angle of the elastic sheet 2 and the controller adjusting the vacuum pump or the size of the pressure regulating port can be obtained through a large number of experiments, or a robot learning algorithm can be introduced to continuously learn the data to obtain a more accurate adjustment method.

[0042] Furthermore, since the detection component includes a position sensor and the position sensor controller is electrically connected, when the propulsion tube is lifted, the position sensor is used to detect the position of the sample in each sampling chamber 3. By real-time monitoring of the sample position, the position sensor can ensure that the sample will not be moved or misplaced during the sampling process, resulting in inaccurate data. This is crucial to maintaining the integrity and representativeness of the sample. The controller adjusts the operation of the vacuum pump according to the data uploaded by the position sensor. Through intelligent control, the controller can ensure the appropriate application of negative pressure during the sampling process, and make corresponding adjustments according to the sample position and pressure conditions to maintain the accuracy and stability of the sampling.

[0043] Further, the vacuum pump extracts the gas in the sampling chamber 3 to achieve the purpose of reducing the air pressure and forming a vacuum, and the gas in the sampling chamber 3 comes from each sampling chamber 3, but the sampling chamber 3 is in direct contact with the sample soil layer, and due to the complex environment of the tidal flat, the soil may contain various impurities, particles and moisture. During the vacuuming process, these impurities and particles may be sucked into the vacuum pump, causing wear on the mechanical parts of the pump, and even causing the performance of the pump to decline or malfunction. By adding a filter component, these impurities and particles can be effectively removed to protect the vacuum pump from damage. Therefore, the pressure regulating component also includes a filter 4, which can be optionally set at the output end of the vacuum pump, or between the inlet end of the vacuum pump and the pressure regulating chamber 1, that is, a filter 4 is added to the transmission channel between the inlet end of the vacuum pump's exhaust pipe and the pressure regulating chamber 1, and the filter 4 realizes the filtration of impurities, particles and moisture contained in the gas. The filter 4 provided can block most impurities and particles from entering the vacuum pump, thereby reducing the maintenance frequency and replacement cycle of the pump. This not only reduces maintenance costs, but also extends the service life of the vacuum pump and the entire sampling equipment.

[0044] Furthermore, when the propulsion cylinder is lifted, each elastic sheet 2 supports the soil sample thereon respectively to achieve the isolation effect between each sampling chamber 3. However, since the elastic sheet 2 itself has a certain elasticity, the movement of the elastic sheet 2 causes a certain deformation, causing the soil sample to slide down, causing the sample between different sampling chambers 3 to flow. It also includes multiple limit blocks, and the multiple limit blocks are respectively arranged in the corresponding slide grooves opened in the elastic sheet 2. When sampling, the elastic sheet 2 is deformed upward due to the push of the soil layer, and the limit blocks slide out of the slide groove; when the propulsion cylinder is lifted, the elastic sheet 2 is deformed and reset due to the gravity effect of the soil layer, and the limit blocks that slide out of the slide groove lock the elastic sheet 2, limiting the reset range of the elastic sheet 2 from the position after deformation to the horizontal line, thereby preventing the elastic sheet 2 from being deformed below the horizontal line due to the gravity effect of the soil sample, causing the flow of the sample. The matching relationship between the limit block and the slide groove opened on the elastic sheet 2 can refer to the setting method of the prior art, so that when the elastic sheet 2 is deformed upward, the limit block slides out, and when the elastic sheet 2 is reset downward, the limit block cannot retract into the slide groove, thereby achieving the clamping of the elastic sheet 2. When designing it, the size of the limit block can be designed to make the limit effect of the limit block on the elastic sheet 2 better, that is, when the limit block is in the state of locking the elastic sheet 2, the contact area between the limit block and the elastic sheet 2 is increased to enhance the locking effect of the elastic sheet 2.

[0045] Furthermore, because the sample height in the sampling barrel is the actual sampling depth, in order to facilitate the operator's observation, a depth scale line is provided on the outer wall of the propulsion barrel. The depth scale line reflects the depth in the sampling barrel, that is, the operator can know the depth of the sample in the sampling barrel by observing the depth scale line, thereby guiding the sampling process.

[0046] Furthermore, a method for sampling and detecting tidal flats comprises the following steps:

[0047] S1: Select a suitable sampling location and arrange the sampling device;

[0048] S2: The propulsion tube is pushed downward, and the soil sample pushes the elastic sheet 2 to deform upward and enter the sampling tube. When the propulsion tube reaches a specific depth, the propulsion tube is lifted;

[0049] S3: before lifting the propulsion cylinder, the negative pressure assembly is opened, and the controller controls the pressure of different sampling chambers 3 by adjusting the size of the pressure regulating port, the elastic sheet 2 rebounds, the limit block limits the elastic sheet 2, and the elastic sheet 2 limits the sample;

[0050] S4: The propulsion tube is completely removed and sampling is completed.

[0051] Furthermore, after the propulsion tube is lifted, the elastic sheet 2 will rebound and push the soil sample below the elastic sheet 2 to the bottom thereof, especially the elastic sheet 2 closest to the opening of the sampling tube. When the elastic sheet 2 rebounds, the soil sample below the elastic sheet 2 will be pushed out of the sampling tube, and this part cannot be regarded as a part of the sampling of the sampling tube. Therefore, this point needs to be considered when calculating the propulsion depth. The calculation method for detecting the specific depth of sampling is combined with the angle α between the elastic sheet 2 and the inner wall of the sampling tube detected by the inclination sensor. α is an acute angle. Therefore, the calculation method for the ideal value of the specific depth of the propulsion tube in step S2 is: combined with the sequence of multiple inclination angles α uploaded by the inclination sensor {α 1 , α 2 , α 3 ,···,α n}, n is the number of sampling chambers containing samples, and the height sequence of the samples in each sampling chamber is {h 1 ,h 2 ,h 3 ,···,h n}, the length of the elastic sheet is l, then the ideal depth value of the sample is .

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sampling and detection device for tidal flats, comprising a propulsion cylinder and a sampling cylinder arranged in the propulsion cylinder, characterized in that: Also included are several compartment components; Any of the partition components comprises a pair of elastic sheets symmetrically arranged about the central axis of the sampling tube, and the fixed ends of the plurality of elastic sheets are respectively mounted on the inner side walls of the sampling tube; The plurality of elastic sheets divide the sampling barrel into a plurality of sampling chambers to block the flow of samples stored in each sampling chamber, and the elastic sheets are opened during the sampling process and closed after the sampling is completed; A pressure regulating assembly is provided on one side of the inner cavity of the propulsion cylinder, and the pressure regulating assembly includes a vacuum pump and a controller, and the controller controls the vacuum pump to evacuate each sampling chamber to control the pressure of different sampling chambers; The pressure regulating assembly includes a pressure regulating chamber, the inlet end of the vacuum pump is arranged in the pressure regulating chamber, a plurality of pressure regulating ports are arranged on the side wall of the pressure regulating chamber, the plurality of pressure regulating ports are respectively connected to a plurality of sampling chambers one by one, and the inner diameter of the pressure regulating chamber is arranged to increase sequentially from top to bottom; It also includes a detection component connected to the controller, the detection component also includes an inclination sensor and a pressure sensor, the pressure sensor is used to measure the pressure on the elastic sheet during sampling, and the inclination sensor is used to identify the inclination angle of the elastic sheet.

2. A tidal flat sampling detection device according to claim 1, characterized in that: It also includes a filter screen, which is arranged at the inlet end of the vacuum pump and is used to filter the gas entering the vacuum pump.

3. A tidal flat sampling detection device according to claim 1, characterized in that: The detection component includes a position sensor; The position sensor is electrically connected to the controller, and when the propulsion tube is lifted, the position sensor is used to detect the position of the sample in each sampling chamber; The controller adjusts the operation of the vacuum pump according to the data uploaded by the position sensor.

4. A tidal flat sampling detection device according to claim 1, characterized in that: It also includes a scale arranged on the outer side wall of the propulsion tube.

5. A tidal flat sampling detection method, using a tidal flat sampling detection device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Select a suitable sampling location and arrange the sampling device; S2: The propulsion tube is pushed downward, and the soil layer pushes the elastic sheet upward to deform and enter the sampling tube, and the propulsion tube reaches a specific depth; S3: Open the pressure regulating assembly, and the controller adjusts the pressure of the sampling chamber through the data uploaded by the pressure detector of the pressure regulating port, the pressure sensor of the elastic sheet, and the inclination sensor. The elastic sheet rebounds and resets, and the propulsion cylinder is lifted at the same time; S4: The lifting of the propulsion tube is completed and the sampling is finished.

6. A tidal flat sampling detection method according to claim 5, characterized in that: The calculation method of the ideal value of the specific depth of the propulsion tube in step S2 is: combining the sequence of multiple inclination angles α uploaded by the inclination sensor {α1, α2, α3, ···, α n }, n is the number of sampling chambers containing samples, and the height sequence of soil samples in each sampling chamber is {h1, h2, h3, ···, h n }, the length of the elastic sheet is l, then the ideal depth value of the sample = .

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