A rapid detection device for excess pore water pressure

Abstract

The present invention provides a rapid detection device for excess pore water pressure, which relates to the technical field of pore water pressure detection. The rapid detection device for excess pore water pressure includes a pressure sensor. A fixing member is fixedly connected to the outer surface of the pressure sensor. A housing is arranged outside the pressure sensor. Both ends of the fixing member are fixedly connected to the inner surface of the housing. Through holes are formed in the left and right side surfaces and the upper and lower side surfaces of the housing. A filter screen is fixedly connected to the outer surface of the housing and located outside the through holes. An installation block is fixedly connected to the outer surface of the housing. By arranging a housing outside the pressure sensor and providing through holes, a filter screen and a cleaning brush on the housing, the silt in the pores can be effectively blocked outside the housing, so that the silt does not directly contact the pressure sensor, which can effectively prevent part of the load in the soil layer from acting on the pressure sensor through the silt, and is beneficial to improving the accuracy of the excess pore water pressure detection.

Description

Technical Field

[0001] The present invention relates to the technical field of pore water pressure detection, and particularly to a rapid detection device for excess pore water pressure. Background Art

[0002] In soil mechanics, excess pore water pressure indicates that during the loading process, the additional pressure P borne by a saturated system is shared by two phases, water and the particle skeleton. The pressure borne by water is called neutral pressure Pwe, and the part borne by the particle skeleton is called effective pressure PS. This neutral pressure caused by additional stress, different from the pore water pressure Pw0 caused by hydrostatic pressure in the soil, is called residual pore water pressure or excess pore water pressure.

[0003] Currently, during the detection of pore water pressure and excess pore water pressure, the detection device is directly lowered into the pore for detection. In this process, the water and silt in the pore will directly contact the detection device. When detecting excess pore water pressure, the applied load will be borne by groundwater and the soil layer, but part of the load borne by the soil layer will act on the detection device through the silt in the pore, resulting in a relatively large numerical error in the detected excess pore water pressure. Summary of the Invention

[0004] (I) Technical Problem to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a rapid detection device for excess pore water pressure, which solves the problem that currently, during the detection of pore water pressure and excess pore water pressure, the detection device is directly lowered into the pore for detection. In this process, the water and silt in the pore will directly contact the detection device. When detecting excess pore water pressure, the applied load will be borne by groundwater and the soil layer, but part of the load borne by the soil layer will act on the detection device through the silt in the pore, resulting in a relatively large numerical error in the detected excess pore water pressure.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A rapid detection device for excess pore water pressure, including a pressure sensor. A fixing member is fixedly connected to the outer surface of the pressure sensor. A housing is arranged outside the pressure sensor. Both ends of the fixing member are fixedly connected to the inner surface of the housing. Through holes are opened on the left and right side surfaces and the upper and lower side surfaces of the housing. A filter screen is fixedly connected to the outer surface of the housing and located outside the through holes. An installation block is fixedly connected to the outer surface of the housing. A cavity is opened inside the installation block. A chute is opened on the side surface of the installation block opposite to the filter screen, and the chute is connected to the inside of the cavity. A motor is fixedly connected to the inner bottom of the cavity. The output end of the motor is fixedly connected to a lead screw, and a nut is movably connected to the surface of the lead screw. By setting the pressure sensor, it is convenient to detect the saturated water pressure and the action of excess pore water pressure in the pores. By setting the fixing member, it is convenient to position the pressure sensor inside the housing. By setting the housing, it is convenient to block the silt in the pores outside the pressure sensor to prevent the pressure of the silt from causing large errors in detecting the pore water pressure and excess pore water pressure. By setting the through holes, it is convenient for the water in the pores to enter the inside of the housing. By setting the filter screen, it is convenient to block the silt to prevent the silt from entering the inside of the housing through the through holes. By setting the installation block, it is convenient to position and install the components for driving the cleaning brush to move. By setting the air, it is convenient to position and install the motor, lead screw, and nut. By setting the chute, it is convenient to position and guide the driven nut. By setting the motor, it is convenient to output power to drive the lead screw to rotate. By setting the lead screw, it is convenient to install the nut and drive the nut to move through the rotation of the lead screw.

[0008] Preferably, a connecting member is fixedly connected to the surface of the nut. The surface of the connecting member away from the nut extends outside the installation block and is fixedly connected to a fixing plate. A cleaning brush is fixedly connected to the side surface of the fixing plate opposite to the outer surface of the housing. By setting the connecting member, it is convenient to install the nut and the fixing plate together, and it can also cooperate with the chute to position and guide the movement of the nut. By setting the fixing plate, it is convenient to position and install the cleaning brush. By setting the cleaning brush, it is convenient to clean the silt on the surface of the filter screen to prevent the silt from blocking the filter screen and causing water to be unable to enter the inside of the housing through the filter screen.

[0009] Preferably, the bristles of the cleaning brush are in contact with the surface of the filter screen, and the mounting blocks are located on the front and rear sides of the filter screen. By arranging the bristles of the cleaning brush to be in contact with the filter screen, the surface of the filter screen can be well cleaned. By arranging the mounting blocks on the front and rear sides of the filter screen, the same fixing plate and cleaning brush can be driven to move by two screw rod assemblies, which can effectively improve the stability of the movement of the fixing plate and the cleaning brush.

[0010] Preferably, electric push rods are fixedly connected to the front and rear side surfaces of the housing. The movable ends of the electric push rods are fixedly connected to a mounting plate, and positioning pins are fixedly connected to the side surface of the mounting plate that is in the same direction as the outer side surface of the housing. The electric push rods are provided to facilitate the movement of the mounting plate and the positioning pins by the telescopic control of the electric push rods. The mounting plate is provided to facilitate the movement of the positioning pins. The positioning pins are provided to facilitate the improvement of the friction force in contact with the pores.

[0011] Preferably, a wire passing hole is formed in the upper right corner of the housing, and the wire passing hole communicates with the inside of the housing. The wire passing hole is provided to facilitate the passing of wires, so as to supply power to the equipment and transmit the detected pressure data.

[0012] Preferably, the number of the through holes and the number of the positioning pins are both multiple, and the overall shape of the positioning pins is conical. The multiple through holes are provided to facilitate the improvement of the efficiency of water entering the housing, so as to achieve the purpose of reducing the detection error. The multiple positioning pins are provided to facilitate the improvement of the friction force in contact with the inner side wall of the pores and prevent the housing from displacing inside the pores.

[0013] Preferably, the overall shape of the fixing member is an "L"-shaped long strip, and a limiting block is fixedly connected to the inner side surface of the fixing member. The distance between the limiting blocks corresponds to the side length of the pressure sensor.

[0014] Preferably, a bearing is fixedly connected to the output end of the screw rod far away from the motor, and the outer side surface of the bearing is fixedly connected to the inner side surface of the cavity.

[0015] Working principle: When in use, lower the housing into the pre-dug pore. When it is lowered to the designated position, drive the mounting plate and positioning pins to move through the extended electric push rod, and make the positioning pins catch in the inner side wall of the pore. Then the water in the pore will enter the interior of the housing. Detect the water pressure under static conditions through the pressure sensor to obtain the saturated water pressure. When construction is carried out around the pore, the ground will be under pressure, and this pressure will act on the soil layer and groundwater respectively. At this time, the measured water pressure is the excess pore water pressure. Subtract the value of the excess pore water pressure from the value of the saturated water pressure to obtain the excess water pressure. While detecting the water pressure, start the motor to drive the screw rod to rotate, and drive the nut to drive the fixed plate and the cleaning brush to move on the surface of the filter screen, so as to clean the surface of the filter screen, thereby preventing the silt in the pore from blocking the filter screen and making the water unable to enter the interior of the housing.

[0016] (III) Beneficial effects

[0017] The present invention provides a rapid detection device for excess pore water pressure. It has the following beneficial effects:

[0018] 1. By arranging a housing outside the pressure sensor and providing through holes, filter screens and cleaning brushes on the housing, the silt in the pore can be effectively blocked outside the housing, so that the silt does not directly contact the pressure sensor, which can effectively prevent part of the load in the soil layer from acting on the pressure sensor through the silt, and is beneficial to improving the accuracy of the excess pore water pressure detection.

[0019] 2. By arranging the screw rod in cooperation with the nut, the fixed plate and the cleaning brush, the surface of the filter screen can be effectively cleaned, and the filter screen can be effectively prevented from being blocked by silt, thus causing the problem that water cannot enter the housing. Description of the drawings

[0020] Figure 1 is a three-dimensional external structure view of a rapid detection device for excess pore water pressure proposed by the present invention;

[0021] Figure 2 is a front view of the internal structure of a rapid detection device for excess pore water pressure proposed by the present invention;

[0022] Figure 3 is a schematic diagram of the internal structure of the mounting block of a rapid detection device for excess pore water pressure proposed by the present invention;

[0023] Figure 4 proposed by the present invention Figure 2 is an enlarged view of A in

[0024] Among them, 1. Pressure sensor; 2. Fixing piece; 3. Housing; 4. Through hole; 5. Filter screen; 6. Mounting block; 7. Fixed plate; 8. Cleaning brush; 9. Wire threading hole; 10. Motor; 11. Lead screw; 12. Nut; 13. Electric push rod; 14. Mounting plate; 15. Positioning pin. Detailed implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] As Figures 1-4 shown, the embodiment of the present invention provides a rapid detection device for excess pore water pressure, including a pressure sensor 1. A fixing piece 2 is fixedly connected to the outer surface of the pressure sensor 1. A housing 3 is arranged outside the pressure sensor 1. Both ends of the fixing piece 2 are fixedly connected to the inner surface of the housing 3. Through holes 4 are opened on the left and right side surfaces and the upper and lower side surfaces of the housing 3. A filter screen 5 is fixedly connected to the outer surface of the housing 3 and located outside the through holes 4. A mounting block 6 is fixedly connected to the outer surface of the housing 3. A cavity is opened inside the mounting block 6. A chute is opened on the side surface of the mounting block 6 opposite to the filter screen 5, and the chute is communicated with the inside of the cavity. A motor 10 is fixedly connected to the inner bottom of the cavity. The output end of the motor 10 is fixedly connected to a lead screw 11. A nut 12 is movably connected to the surface of the lead screw 11. The material of the fixing piece 2 can be any one of plastic, metal nylon materials. The material of the filter screen 5 can be any one of plastic, metal, activated carbon, nylon, and polymer synthetic materials. The material of the housing 3 can be any one of polyethylene, PVC, and polyvinyl chloride.

[0027] A connecting piece is fixedly connected to the surface of the nut 12. The surface of the connecting piece far from the nut 12 extends outside the mounting block 6 and is fixedly connected to a fixed plate 7. A cleaning brush 8 is fixedly connected to the side surface of the fixed plate 7 opposite to the outer surface of the housing 3. The bristles of the cleaning brush 8 are in contact with the surface of the filter screen 5. The mounting block 6 is located on the front and rear sides of the filter screen 5.

[0028] Electric push rods 13 are fixedly connected to the front and rear side surfaces of the housing 3. The movable end of the electric push rod 13 is fixedly connected to a mounting plate 14. A positioning pin 15 is fixedly connected to the side surface of the mounting plate 14 in the same direction as the outer surface of the housing 3. The electric push rods 13, the motor 10, and the pressure sensor 1 have all been waterproofed. The shape of the mounting plate 14 can be any one of square and arc-shaped.

[0029] A wire passing hole 9 is formed in the upper right corner of the housing 3. The wire passing hole 9 is in communication with the interior of the housing 3. The pressure sensor 1, the motor 10, and the electric push rod 13 are all connected to the outside through wires, and the wires pass through the wire passing hole.

[0030] The number of through holes 4 and the number of positioning pins 15 are both multiple, and the overall shape of the positioning pins 15 is conical.

[0031] The overall shape of the fixing member 2 is an "L"-shaped strip. A limiting block is fixedly connected to the inner side surface of the fixing member 2, and the distance between the limiting blocks corresponds to the side length of the pressure sensor 1.

[0032] A bearing is fixedly connected to the output end of the lead screw 11 away from the motor 10, and the outer side surface of the bearing is fixedly connected to the inner side surface of the cavity.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid detection device for excess pore water pressure, comprising a pressure sensor (1), characterized in that: A fixing member (2) is fixedly connected to the outer surface of the pressure sensor (1). The overall shape of the fixing member (2) is an "L"-shaped strip. A limiting block is fixedly connected to the inner surface of the fixing member (2). The distance between the limiting blocks corresponds to the side length of the pressure sensor (1). A housing (3) is arranged outside the pressure sensor (1). Both ends of the fixing member (2) are fixedly connected to the inner surface of the housing (3). Through holes (4) are formed in both the left and right side surfaces and the upper and lower side surfaces of the housing (3). A filter screen (5) is fixedly connected to the outer surface of the housing (3) and located outside the through holes (4). An installation block (6) is fixedly connected to the outer surface of the housing (3). A cavity is formed inside the installation block (6). A chute is formed in the side surface of the installation block (6) opposite to the filter screen (5), and the chute is communicated with the inside of the cavity. A motor (10) is fixedly connected to the inner bottom of the cavity. The output end of the motor (10) is fixedly connected to a lead screw (11). A nut (12) is movably connected to the surface of the lead screw (11). A connecting member is fixedly connected to the surface of the nut (12). The surface of the connecting member away from the nut (12) extends outside the installation block (6) and is fixedly connected to a fixing plate (7). A cleaning brush (8) is fixedly connected to the side surface of the fixing plate (7) opposite to the outer surface of the housing (3); Electric push rods (13) are fixedly connected to both the front and rear side surfaces of the housing (3). The movable ends of the electric push rods (13) are fixedly connected to a mounting plate (14). A positioning pin (15) is fixedly connected to the side surface of the mounting plate (14) in the same direction as the outer surface of the housing (3).

2. The rapid detection device for excess pore water pressure according to claim 1, wherein: The bristles of the cleaning brush (8) are in contact with the surface of the filter screen (5). The installation block (6) is located on the front and rear sides of the filter screen (5).

3. The rapid detection device for excess pore water pressure according to claim 1, wherein: A wire passing hole (9) is formed in the upper right corner of the housing (3), and the wire passing hole (9) is communicated with the inside of the housing (3).

4. The rapid detection device for excess pore water pressure according to claim 1, characterized in that: The number of the through holes (4) and the number of the positioning pins (15) are both multiple. The overall shape of the positioning pin (15) is conical.

5. The rapid detection device for excess pore water pressure according to claim 1, characterized in that: A bearing is fixedly connected to the output end of the lead screw (11) away from the motor (10). The outer surface of the bearing is fixedly connected to the inner surface of the cavity.

Images