Embedded deep foundation pit crack propagation monitoring device

Abstract

The utility model relates to an embedded deep foundation pit crack expansion monitoring device which comprises an installation part and a fixing part, and the installation part comprises an outer installation machine arranged above a foundation pit crack and an inner installation machine arranged in the outer installation machine; the fixing component comprises two threaded rods, and each threaded rod is in lap joint with the slotted screwdriver through a threaded rod cap arranged at the top end. The device is composed of the installation part and the fixing part, the two parts are light in size, the equipment manufacturing and maintenance cost can be effectively saved, and the device is easy to manufacture, convenient to operate and easy to use and master by workers; the crack width of the deep foundation pit is monitored by arranging the parallel-plate capacitor, the expansion of the crack is identified through the change of the potential difference, and the monitoring effect is very sensitive; by embedding the fixing component with the parallel plate capacitor into the deep foundation pit crack for monitoring, the monitoring continuity can be realized, and the monitoring precision and reliability are superior to those in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of geotechnical engineering construction monitoring, and particularly relates to an embedded deep foundation pit crack propagation monitoring device. Background Technique

[0002] With the increase of existing underground projects, deep foundation pit cracks have gradually attracted people's attention. Deep foundation pit cracks refer to the phenomenon that cracks occur in the surrounding soil or structure of the foundation pit due to various factors during the underground excavation process. The appearance of these cracks may affect the stability of the foundation pit and even lead to the instability of the foundation pit and safety accidents. The causes of deep foundation pit cracks are complex and involve multiple factors. For example, the weakening of soil properties and the influence of groundwater, the inability of the foundation pit support structure to fully restrain soil deformation, improper construction and the influence of external loads will all cause cracks to appear on the side wall of the deep foundation pit. The generation of deep foundation pit cracks is the result of the combined action of multiple factors, and a series of the above factors need to be comprehensively considered in the design and construction process to reduce the risk of crack generation.

[0003] At present, sensor technology has been widely used in the monitoring of deep foundation pit cracks. Sensors can real-time monitor parameters such as the displacement, width and depth of foundation pit cracks, and provide high-precision and highly reliable monitoring data. The wireless sensor network can transmit the collected monitoring data to the monitoring center wirelessly to realize remote real-time monitoring. By applying technologies such as data mining, machine learning and artificial intelligence, a large amount of monitoring data can be deeply analyzed, key features can be extracted, and the development trend of cracks can be predicted, so as to provide a scientific basis for decision-making. The research of deep foundation pit crack monitoring devices is developing towards the direction of high precision, real-time, intelligent and comprehensive. However, in such intelligent and digital foundation pit crack monitoring devices, the monitoring accuracy and reliability cannot be fully guaranteed. Especially in some strong interference situations, the accuracy and reliability of monitoring data cannot be ensured. At the same time, the manufacturing and integration of the above-mentioned large monitoring devices and systems involve many processes, and their manufacturing costs are too high, which will also bring a large amount of later maintenance costs and equipment replacement costs.

[0004] After retrieval, the patent with the publication number of CN218147678U discloses a foundation pit crack detection device for geotechnical engineering, which is convenient to adjust the detection range of the detection device. The above device drives the lead screw to rotate by starting the motor. Under the cooperation of the threaded hole inside the operation board, the lead screw pushes the snap ring and the snap ring to move. Under the action of the snap ring, the detection device moves to complete the adjustment of the height of the detection device. Although the device can monitor the deep foundation pit cracks more carefully and save manpower and material resources, the monitoring device is still in the external perspective and cannot deeply observe the propagation of deep foundation pit cracks and realize real-time feedback. Therefore, there is an urgent need for an embedded deep foundation pit crack propagation monitoring device in the market. Content of the Utility Model

[0005] The present utility model aims to solve the technical problems in the prior art that the deep foundation pit crack monitoring technology and device cannot ensure monitoring accuracy and reliability, and the equipment cost and maintenance cost are too high, and provides an embedded deep foundation pit crack expansion monitoring device.

[0006] To solve the above technical problems, the technical solution of the present utility model is as follows:

[0007] An embedded deep foundation pit crack expansion monitoring device, comprising: a mounting component and a fixing component;

[0008] The mounting component includes: an outer mounting machine, which is arranged above the foundation pit crack; an inner mounting machine is sleeved inside the outer mounting machine; two outer rotating shaft cylinders are respectively installed on both sides of the bottom of the outer mounting machine, and two inner rotating shaft cylinders are respectively installed on both sides of the bottom of the inner mounting machine; the two inner rotating shaft cylinders are respectively arranged inside the two outer rotating shaft cylinders; flat-tip screwdrivers are respectively installed at the ends of the two inner rotating shaft cylinders, a first motor is installed on one side of the outer mounting machine, and a second motor is installed on the other side, and the first motor and / or the second motor are respectively used for the forward and / or reverse rotation of the outer rotating shaft cylinder and / or the inner rotating shaft cylinder;

[0009] The fixing component includes: two threaded rods, each threaded rod is overlapped with a flat-tip screwdriver through a threaded rod cap arranged at the top; an annular fixing cover plate is sleeved in the middle of each threaded rod, the fixing cover plate is mutually fitted with the outer rotating shaft cylinder, a cylindrical fixing cylinder is installed below the fixing cover plate, and the fixing cylinder is used for rotating and inserting into the soil; a fixing cone is installed below the fixing cylinder; an annular capacitor plate is installed on the upper surface of the fixing cover plate, and the capacitor plate is sleeved on the threaded rod; the fixing cone includes two conical pieces, a pressure-sensitive plate runs through the center of the two conical pieces, and slideways are respectively installed on the inner sides of the two conical pieces; the fixing cone is connected with the fixing cylinder through a limit nut;

[0010] Threaded threads are provided on each threaded rod; internal threads provided on the inner surface of the fixing cylinder are mutually fitted with the threaded threads;

[0011] When the threaded rod gradually enters the fixing cone by rotation and pushes the two conical pieces open, the slideway threads provided on the slideway are mutually fitted with the threaded threads.

[0012] In the above technical solution, a number of turns of coils are respectively wound on the outer surfaces of the two outer rotating shaft cylinders; an annular locking magnet is arranged outside the connection between the outer rotating shaft cylinder and the fixing cover plate, and the locking magnet is used to adsorb the fixing cover plate on the outer rotating shaft cylinder.

[0013] In the above technical solution, mica dielectrics are respectively laid on the surfaces of the two capacitor plates, and the two capacitor plates are symmetrically arranged relative to each other; threaded through holes are respectively provided at the central positions of the capacitor plates and the mica dielectrics.

[0014] In the above technical solution, a slotted groove is provided in the middle of the screw rod cap, and the slotted groove fits with the flat-tip screwdriver.

[0015] In the above technical solution, external threads are provided on the outer surface of the fixing cylinder.

[0016] In the above technical solution, conical threads are respectively provided on the outer surfaces of the two conical pieces.

[0017] The utility model has the following beneficial effects:

[0018] For the embedded deep foundation pit crack propagation monitoring device of the utility model, the width of the deep foundation pit crack is monitored by setting a parallel plate capacitor, and the expansion of the crack is identified by the change of the potential difference, and the monitoring effect is very sensitive.

[0019] For the embedded deep foundation pit crack propagation monitoring device of the utility model, by embedding the fixing component with the parallel plate capacitor into the deep foundation pit crack for monitoring, the continuity of the monitoring can be realized, and the monitoring accuracy and reliability are better than the prior art.

[0020] The embedded deep foundation pit crack propagation monitoring device of the utility model is composed of an installation component and a fixing component. The above two parts are light in volume, can effectively save the equipment manufacturing and maintenance costs, are simple to manufacture, convenient to operate, and are easy for the staff to use and master. Description of the Drawings

[0021] The following further details the utility model in conjunction with the drawings and specific embodiments.

[0022] Figure 1 It is a schematic structural diagram of the embedded deep foundation pit crack propagation monitoring device of the utility model.

[0023] Figure 2 It is a schematic diagram of the fixing component of the embedded deep foundation pit crack propagation monitoring device of the utility model and its details.

[0024] Figure 3 It is a schematic diagram of the capacitor plate of the embedded deep foundation pit crack propagation monitoring device of the utility model and its structure.

[0025] Figure 4 It is a schematic structural diagram of the outer rotating shaft cylinder of the embedded deep foundation pit crack propagation monitoring device of the utility model and the joint with the fixing component.

[0026] Figure 5 Schematic diagram of the working mechanism of the pressure-sensitive plate of the embedded deep foundation pit crack expansion monitoring device of the present utility model.

[0027] The reference signs in the figure are shown as:

[0028] 1 - Foundation pit crack; 2 - Outer installation machine; 3 - Inner installation machine; 4 - Outer rotating shaft cylinder; 5 - Inner rotating shaft cylinder; 6 - Flat-head screwdriver; 7 - First motor; 8 - Second motor; 9 - Threaded rod; 10 - Fixing cover plate; 11 - Fixing cylinder; 12 - Fixing cone; 13 - Capacitor plate; 14 - Threaded rod cap; 15 - Pressure-sensitive plate; 16 - Slideway; 17 - Limit nut; 18 - Rod thread; 19 - External thread; 20 - Internal thread; 21 - Slideway thread; 22 - Cone piece thread; 23 - Mica medium; 24 - Threaded through hole; 25 - Coil; 26 - Locking magnet. Specific implementation mode

[0029] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, 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 utility model.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The following will further describe the present utility model in detail in conjunction with the accompanying drawings.

[0031] The monitoring device of the present utility model includes an installation component and a fixing component to achieve refined monitoring and sensitive capture of deep foundation pit cracks. The monitoring device is easy to install, light in weight, and can be automatically controlled during use, thus being convenient to operate, saving costs, and the usage method is also easy for staff to master.

[0032] The present utility model provides a device that can be embedded inside the foundation pit crack for monitoring. It is small in volume, easy to install and use, solves the problems of poor monitoring accuracy and reliability of the existing deep foundation pit crack monitoring technology and devices, and has lower manufacturing and maintenance costs than the existing devices.

[0033] As Figures 1-5As shown in the figure, the embedded deep foundation pit crack propagation monitoring device of the present utility model comprises two parts: an installation component and a fixing component.

[0034] For the installation component, its main body includes: an outer installation machine 2, which is erected above the foundation pit crack 1; an inner installation machine 3 is sleeved inside the outer installation machine 2, and an outer rotating shaft cylinder 4 is respectively installed on both sides of the bottom of the outer installation machine 2, and an inner rotating shaft cylinder 5 is respectively installed on both sides of the bottom of the inner installation machine 3. Both the outer rotating shaft cylinder 4 and the inner rotating shaft cylinder 5 are cylindrical, and a flat-head screwdriver 6 is respectively installed at the end parts of the two inner rotating shaft cylinders 5, and the flat-head screwdriver 6 can rotate along the axis together with the inner rotating shaft cylinder 5. A first motor 7 is installed on the left side of the outer installation machine 2, and a second motor 8 is installed on the right side. The first motor 7 supplies power to the outer installation machine 2 to start the outer installation machine 2 to rotate the outer rotating shaft cylinder 4, and the second motor 8 supplies power to the inner installation machine 3 to start the inner installation machine 3 to rotate the inner rotating shaft cylinder 5.

[0035] For the fixing component, its lower end is inserted into the soil body, and its upper end is connected to the installation component; the main body of the fixing component includes: two threaded rods 9, each threaded rod 9 is lapped with a flat-blade screwdriver 6 through a threaded rod cap 14 arranged at the top end. The middle part of the threaded rod cap 14 is provided with a cross-shaped groove, which is mutually fitted with the flat-blade screwdriver 6 through this cross-shaped groove; a ring-shaped fixing cover plate 10 is sleeved on the middle part of each threaded rod 9. The fixing cover plate 10 is mutually fitted with the outer rotating shaft cylinder 4. A cylindrical fixing cylinder 11 is installed below the fixing cover plate 10, and a fixing cone 12 is installed behind the fixing cylinder 11. The fixing cone 12 can make the fixing component more smoothly embedded in the soil. A capacitor plate 13 is installed in front of the fixing cover plate 10. The capacitor plate 13 is also ring-shaped and sleeved on the threaded rod 9. Mica dielectrics 23 are laid on the surfaces of the two capacitor plates 13. The two capacitor plates 13 are respectively located on both sides of the foundation pit crack 1 and are symmetrically arranged relative to each other. Charges can be enriched on the two capacitor plates 13 and their mica dielectrics 23 to form a potential difference. Threaded through holes 24 are respectively provided in the centers of the capacitor plate 13 and the mica dielectric 23, and the threaded through holes 24 are mutually fitted with the rod threads 18. The fixing cone 12 includes two conical pieces. A pressure-sensitive plate 15 runs across the center of the two conical pieces. The pressure-sensitive plate 15 can elongate as the two conical pieces unfold and is at the bottommost position allowed for the insertion of the threaded rod 9. Slideways 16 are respectively installed on the inner sides of the two conical pieces. The fixing cone 12 is connected to the fixing cylinder 11 through a limit nut 17. Rod threads 18 are provided on the threaded rods 9. Internal threads 20 provided on the inner surface of the fixing cylinder 11 are mutually fitted with the rod threads 18. Slideway threads 21 are provided on the slideways 16 and are mutually fitted with the rod threads 18 after entering the slideways 16. Cone threads 22 are also provided on the conical pieces of the fixing cone 12. A number of turns of coils 25 are wound around the outer surfaces of the two outer rotating shaft cylinders 4. The coils 25 can be energized. An annular locking magnet 26 is provided outside the connection between the outer rotating shaft cylinder 4 and the fixing cover plate 10. The current of the coils 25 can make the locking magnet 26 generate magnetism, and then the fixing cover plate 10 can be adsorbed on the outer rotating shaft cylinder 4. External threads 19 are provided on the outer surface of the fixing cylinder 11, and cone threads 22 are respectively provided on the outer surfaces of the two conical pieces of the fixing cone 12 to respectively facilitate the rotation and insertion of the fixing cylinder 11 and the fixing cone 12 into the soil body.

[0036] The embedded deep foundation pit crack expansion monitoring device of the present utility model, when installing the device, overlaps the locking magnets 26 of the two outer rotating shaft cylinders 4 with the fixing cover plate 10, starts the first motor 7. At this time, the coil 25 is energized, and the polarized locking magnet 26 generates magnetism, adsorbing and locking the fixing cover plate 10. At the same time, the outer rotating shaft cylinder 4 starts to rotate, driving the locking magnet 26 and the fixing cover plate 10 to rotate together, and rotating together with the fixing cylinder 11 and the fixing cone 12. Thus, the fixing component gradually inserts into the foundation pit crack 1. When the fixing cover plate 10 contacts the soil body, start the second motor 8. At this time, the inner rotating shaft cylinder 5 rotates together with the flat-tip screwdriver 6, drives the threaded rod 9 to rotate and insert through the groove on the threaded rod cap 14. The threaded rod 9 gradually enters the fixing cone 12, engages with the slideway thread 21 on the slideway 16 and continues to insert, pushing open the two conical pieces. The two conical pieces gradually compact the surrounding soil body to achieve the fixation of the soil body. When the threaded rod 9 reaches the pressure-sensitive plate 15, turn off the first motor 7 and the second motor 8. The magnetism of the locking magnet 26 disappears, and the installation component is removed.

[0037] The embedded deep foundation pit crack expansion monitoring device of the present utility model, when removing the device, first starts the second motor 8, starts the inner rotating shaft cylinder 5 to rotate in the reverse direction, so that the threaded rod 9 disengages from the slideway 16. Then start the first motor 7, the coil 25 is energized, the locking magnet 26 generates magnetism and adsorbs the fixing cover plate 10, and start the outer rotating shaft cylinder 4 to rotate in the reverse direction, so that the fixing cylinder 11 gradually disengages from the soil body.

[0038] As Figure 5 shown, for the embedded deep foundation pit crack expansion monitoring device of the present utility model, when installing the device, when the threaded rod 9 contacts the slideway 16 and starts to penetrate, the conical pieces start to expand, the pressure-sensitive plate 15 starts to elongate, and then the pressure-sensitive plate 15 starts to detect the normal pressure. If there is no normal pressure, the pressure-sensitive plate 15 is not activated and repeatedly detects the pressure. When one end of the threaded rod 9 reaches the pressure-sensitive plate 15, the pressure-sensitive plate 15 is subjected to the normal pressure and is activated, controlling the opening of the capacitor plates 13. At this time, an electric potential difference is generated between the two capacitor plates 13 and they start to work. When the threaded rod 9 starts to move outwards, the normal pressure on the pressure-sensitive plate 15 disappears, and the two capacitor plates 13 close.

[0039] For the embedded deep foundation pit crack expansion monitoring device of the present utility model, when the device is working, there is an electric potential difference between the two capacitor plates 13. When the width of the deep foundation pit crack expands, the electric potential difference between the two capacitor plates 13 changes, thus capturing the expansion of the deep foundation pit crack. The above-mentioned electric potential difference can be monitored in real time during the operation of the device and uploaded to the server, thus ensuring the continuity and accuracy of the monitoring.

[0040] The embedded deep foundation pit crack propagation monitoring device of the present utility model monitors the width of the deep foundation pit crack by setting a parallel plate capacitor, and identifies the crack propagation through the change of the potential difference, and the monitoring effect is very sensitive.

[0041] The embedded deep foundation pit crack propagation monitoring device of the present utility model can achieve continuous monitoring by embedding the fixing component with the parallel plate capacitor into the deep foundation pit crack, and the monitoring accuracy and reliability are superior to the prior art.

[0042] The embedded deep foundation pit crack propagation monitoring device of the present utility model is composed of an installation component and a fixing component. The volumes of the above two components are light, which can effectively save the equipment manufacturing and maintenance costs, and are simple to manufacture and convenient to operate, and are easy for the staff to use and master.

[0043] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An embedded deep foundation pit crack expansion monitoring device, characterized in that: include: Mounting parts and fixing parts; The mounting components include: an external mounting machine (2), the external mounting machine (2) being arranged above the foundation pit crack (1); an internal mounting machine (3) being sleeved inside the external mounting machine (2); an external rotating shaft cylinder (4) being respectively installed on both sides of the bottom of the external mounting machine (2), and an internal rotating shaft cylinder (5) being respectively installed on both sides of the bottom of the internal mounting machine (3); the two internal rotating shaft cylinders (5) being respectively arranged inside the two external rotating shaft cylinders (4); a flat-blade screwdriver (6) being respectively installed at the ends of the two internal rotating shaft cylinders (5); a first motor (7) being installed on one side of the external mounting machine (2), and a second motor (8) being installed on the other side; the first motor (7) and / or the second motor (8) being respectively used for the forward and / or reverse rotation of the external rotating shaft cylinder (4) and / or the internal rotating shaft cylinder (5); The fixing component comprises: two threaded rods (9), each of the threaded rods (9) being overlapped with a flat-blade screwdriver (6) through a threaded rod cap (14) arranged at the top; an annular fixing cover plate (10) is sleeved on the middle part of each threaded rod (9), the fixing cover plate (10) and the outer rotating shaft cylinder (4) are mutually matched, and a cylindrical fixing cylinder (11) is installed below the fixing cover plate (10), and the fixing cylinder (11) is used for rotating and inserting into the soil; the fixing A fixing cone (12) is installed below the fixing cylinder (11); an annular capacitor plate (13) is installed on the fixing cover plate (10), and the capacitor plate (13) is sleeved on the threaded rod (9); the fixing cone (12) comprises two cone plates, a pressure-sensitive plate (15) is transversely passed through the center of the two cone plates, and slideways (16) are respectively installed on the inner sides of the two cone plates; the fixing cone (12) is connected to the fixing cylinder (11) through a limiting nut (17); Each of the threaded rods (9) is provided with a rod thread (18); the inner surface of the fixing tube (11) is provided with an internal thread (20) which fits with the rod thread (18); When the threaded rod (9) gradually enters the fixing cone (12) by rotating and pushes the two cone sheets apart, the slideway threads (21) provided on the slideway (16) and the rod threads (18) fit together.

2. The embedded deep foundation pit crack expansion monitoring device according to claim 1 is characterized in that: The outer surfaces of the two outer rotating shaft cylinders (4) are respectively wound with a plurality of turns of coils (25); an annular locking magnet (26) is provided on the outside of the junction between the outer rotating shaft cylinder (4) and the fixing cover plate (10), and the locking magnet (26) is used to adsorb the fixing cover plate (10) onto the outer rotating shaft cylinder (4).

3. The embedded deep foundation pit crack expansion monitoring device according to claim 1 is characterized in that: The surfaces of the two capacitor plates (13) are respectively coated with a mica medium (23), and the two capacitor plates (13) are relatively symmetrically arranged; threaded through holes (24) are respectively arranged at the central positions of the capacitor plates (13) and the mica medium (23).

4. The embedded deep foundation pit crack expansion monitoring device according to claim 1 is characterized in that: A straight groove is provided in the middle of the threaded rod cap (14), and the straight groove fits with the flat-blade screwdriver (6).

5. The embedded deep foundation pit crack expansion monitoring device according to claim 1 is characterized in that: The fixing tube (11) is provided with an external thread (19) on its outer surface.

6. The embedded deep foundation pit crack expansion monitoring device according to claim 1 is characterized in that: Cone threads (22) are respectively arranged on the outer surfaces of the two cone pieces.

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