Soft soil foundation treatment deep layer horizontal displacement monitoring device and monitoring method

Abstract

The invention discloses a soft soil foundation treatment deep layer horizontal displacement monitoring device and method, and the device comprises an inclinometer pipe, a protection sealing pipe which is coaxially installed in the inclinometer pipe, a plurality of horizontal displacement monitoring mechanisms which are located in the protection sealing pipe at intervals, and a side supporting mechanism which is arranged on each horizontal displacement monitoring mechanism. The protective sealing pipe comprises an inner inflation pipe and an outer inflation pipe which are coaxially arranged; the horizontal displacement monitoring mechanism comprises a sound wave distance measuring sensor and a tilt angle sensor which are arranged in the inflatable inner pipe, and the sound wave distance measuring sensor and the tilt angle sensor are configured to monitor the distance and the tilt angle of the previous horizontal displacement monitoring mechanism; the side supporting mechanism is configured to be attached to the inner side of the inclinometer pipe during working and transmit stress of the corresponding position of the inclinometer pipe to the horizontal displacement monitoring mechanism, the protective sealing pipe is driven by the inclinometer pipe to synchronously deform, the deep horizontal displacement of the soft soil foundation can be monitored, and data effectiveness is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering monitoring for soft soil foundation treatment, and in particular to a deep horizontal displacement monitoring device and a monitoring method for soft soil foundation treatment. Background Art

[0002] The existing land resources restrict its economic development. With the integration of water transport, sea transport and other modes of transportation, the city will focus more on the land area closer to the seaside, etc. However, the original soil in this area is mostly soft soil, which has the characteristics of high water content, high compressibility, low strength and low permeability, and poor physical properties. Therefore, the foundation of this area must be reinforced to meet the needs of subsequent construction. In the soft foundation treatment project in the southeast coastal area, the preloading method is usually used to reinforce the soft soil foundation. This method is economical, practical, and technically feasible. It is to set up a cofferdam outside the site, and preload the surface of the foundation in the site to raise the pore water in the soil along the groove of the plastic board to escape from the ground, accelerate the settlement process of the soft soil foundation, and enable the reinforced soil to drain and consolidate, improve the strength of the soil, and thus achieve the purpose of strengthening the foundation. However, this method has a slow foundation strength growth process during the reinforcement process. However, if the pile load is too fast or too large during the construction process, the foundation soil strength has not yet grown to the strength that can withstand the pile load, resulting in deep landslides or cofferdam collapse and other engineering accidents, which not only delays the construction period, but also increases the economic investment cost. How to correctly and effectively control the quality of soft soil foundation treatment projects and ensure the safety and stability of the foundation on the site is a problem that must be solved.

[0003] The purpose of setting up deep horizontal displacement monitoring of soil is to timely understand the changes in deep horizontal displacement of the foundation soil around the site during the soft soil foundation treatment process. By monitoring the deep horizontal displacement of the cofferdam soil or the surrounding soil, the change law of the deep horizontal displacement can be timely and effectively grasped, and then the next load application time can be determined, avoiding the deep landslide of soil or the collapse of cofferdam due to the destruction of soil strength due to too fast or too much construction load.

[0004] At present, the deep horizontal displacement of the soil is measured by drilling and burying inclinometers outside the loading area or at the foot of the cofferdam slope. The drilling depth is to the fixed layer, and the deep horizontal displacement is monitored by manually pulling the inclinometer in the tube. For the preloading foundation treatment project, inclinometers should be drilled and buried around the site. First, the monitoring personnel need to manually pull the inclinometer to test the inclinometer. Each inclinometer needs to be tested twice, positive and negative (rotated 180 degrees on the basis of the positive test). In addition, the inclinometer hole is deep and the site area is large and cannot be driven, so the workload of the monitoring personnel is large; second, the inclinometer tube is mostly made of PVC and ABS. The material is deformed and bent in the soil to reflect the deep horizontal deformation of the soil. If the joint is not sealed well, silt enters the tube and blocks the tube, or if the deformation is large, the inclinometer tube will break at the joint or in the middle, which will cause the inclinometer to be unable to be put in, and the deep horizontal displacement of the foundation soil cannot be monitored, and then the safety and stability of the foundation soil cannot be further grasped.

[0005] The patent number is CN202310912488.4, and the patent name is an inclinometer. It is equipped with a flip plate, and the counting sensor is connected to the controller to record the number of times the flip plate flips. It can automatically lay out the line and automatically and accurately record data. However, it cannot solve the problem of many holes and the inability to drive on site. Compared with the commonly used inclinometers, the equipment has more devices such as flip plates, and it is not easy for monitoring personnel to carry the monitoring equipment.

[0006] The patent number is CN202311610042.2, and the patent name is automated inclinometer. It improves work efficiency by using automatic winding of an electric motor instead of the traditional manual pulling method. However, the motor in the equipment increases the weight of the instrument, making it more difficult to carry and increasing the workload of monitoring personnel.

[0007] The existing technology realizes automatic data collection by installing a fixed inclinometer, and multiple inclinometer sensors are placed in the inclinometer tube. However, the installation steps of the fixed inclinometer are relatively complicated, and the sensors must be connected one by one. In the process of lowering, it is easy to fall due to the heavy connecting rods and sensors, causing injuries to the installers. The technical operation requirements are high. Therefore, a deep horizontal displacement monitoring device and a monitoring method for soft soil foundation treatment are urgently needed to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a deep horizontal displacement monitoring device and a monitoring method for soft soil foundation treatment, which can effectively solve the problems existing in the above-mentioned prior art.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions: a deep horizontal displacement monitoring device for soft soil foundation treatment, comprising:

[0010] Inclinometer tube, pre-buried at the position to be measured, with the depth extending at least to the immovable soil layer;

[0011] A protective sealing tube, coaxially installed in the inclinometer tube, the protective sealing tube comprising a coaxially arranged gas-filled inner tube and a gas-filled outer tube; and

[0012] A plurality of horizontal displacement monitoring mechanisms are arranged at intervals in the protective sealing tube, and the horizontal displacement monitoring mechanisms include an acoustic wave ranging sensor and an inclination sensor arranged in the inflatable inner tube, and the acoustic wave ranging sensor and the inclination sensor are configured to monitor the distance and inclination of the previous horizontal displacement monitoring mechanism;

[0013] Each of the horizontal displacement monitoring mechanisms is provided with a side support mechanism, and the side support mechanism is configured to fit inside the inclinometer tube when in operation, and transmit the force at the corresponding position of the inclinometer tube to the horizontal displacement monitoring mechanism.

[0014] Preferably, a trachea connector is installed at the top of the protective sealing tube, and a one-way valve structure is provided inside the trachea connector. The trachea connector is used to connect an external pressure device to inflate the inner inflation tube and the outer inflation tube as needed.

[0015] Preferably, the horizontal displacement monitoring mechanism also includes a pair of waterproof connectors, two of which are installed at intervals inside the inflatable inner tube, and the two waterproof connectors and the inside of the inflatable inner tube together form a sealed chamber, and the acoustic ranging sensor and the inclination sensor are installed in the sealed chamber.

[0016] Preferably, the side support mechanism comprises a plurality of support shafts uniformly arranged along the circumferential direction, one end of the support shaft is connected to the horizontal displacement monitoring mechanism, and the other end extends out of the inflatable outer tube; and

[0017] A plurality of grooves are arranged inside the inclinometer tube, and the grooves are configured to allow the support shafts to slide in and guide the support shafts to move along the route.

[0018] Preferably, the side support mechanism further comprises a plurality of support ribs uniformly arranged along the circumferential direction, wherein the support ribs are radially arranged inside the inflatable inner tube and / or the inflatable outer tube, and the support ribs are provided with:

[0019] A plurality of support blocks are sequentially connected along the radial direction inside the support rib, and two adjacent support blocks are movably connected;

[0020] The central inflatable strip runs through all the support blocks and is connected with the inner inflatable tube or the outer inflatable tube. When inflating, the central inflatable strip controls all the support blocks to be distributed in a radial collinear manner.

[0021] Preferably, a counterweight base is installed at the bottom end of the protective sealing tube, and a plurality of support shafts are evenly installed along the circumference of the counterweight base. The counterweight base is configured to guide the protective sealing tube into the inclinometer tube under the action of gravity.

[0022] Preferably, a notch is provided at the bottom of the inclinometer tube, an insert block is installed at the bottom of the counterweight base, and a locking mechanism is installed on the insert block, and the locking mechanism is configured to lock the counterweight base and the notch when the inflatable inner tube and the inflatable outer tube are inflated, or to unlock the counterweight base and the notch when the inflatable inner tube and the inflatable outer tube are deflated.

[0023] Preferably, the locking mechanism comprises a plurality of locking beads arranged along the circumference of the plug block, a special-shaped block is slidably installed in the plug block, an elastic airbag is installed at one end of the special-shaped block, the elastic airbag is connected to the inflatable inner tube or the inflatable outer tube, and a plurality of locking holes are correspondingly arranged on the inner wall of the notch; the elastic airbag is configured as follows:

[0024] In a natural state, the elasticity of the self pulls the special-shaped block to move to the first position, and the locking bead can freely escape from the locking hole and retract into the inside of the plug block;

[0025] In the inflated state, the special-shaped block is pushed to move to the second position, and the special-shaped block at the second position squeezes the locking bead part out of the plug block and is stuck in the locking hole.

[0026] The present invention also discloses a method for monitoring deep horizontal displacement of soft soil foundation treatment, which is based on a deep horizontal displacement monitoring device for soft soil foundation treatment and specifically includes:

[0027] S1. Assemble the horizontal displacement monitoring device and inflate the inner and outer inflatable tubes so that the support shaft is in full contact with the inner wall of the inclinometer tube and all support blocks are distributed in radial collinearity.

[0028] S2, connecting the data of each horizontal displacement monitoring mechanism to the automatic acquisition device;

[0029] S3, from bottom to top, the first horizontal displacement monitoring mechanism monitors the acoustic distance sensor data and the inclination sensor data of the counterweight chassis, and calculates the distance L′ and the inclination Δ of the first horizontal displacement monitoring mechanism;

[0030] S4. Obtain the data of each horizontal displacement monitoring mechanism in sequence from bottom to top and calculate:

[0031] Horizontal displacement values ​​of each horizontal displacement monitoring mechanism:

[0032]

[0033] Among them, s i is the i-th horizontal displacement monitoring mechanism from bottom to top, n is the number of horizontal displacement monitoring mechanisms; the depth value of each horizontal displacement monitoring mechanism is:

[0034]

[0035] adjusting the horizontal displacement value of the adjacent horizontal displacement monitoring mechanism in real time based on the depth value;

[0036] S5. Count the horizontal displacement values, calculate the horizontal displacement rate, and draw the deep horizontal displacement curve.

[0037] Preferably, based on the data of the acoustic wave ranging sensor, the distance L′ between the upper and lower horizontal displacement monitoring mechanisms of the acoustic wave ranging sensor is calculated, and the formula is: L′=v*t / 2, v is the speed of the acoustic wave, and t is the time from emission to reception; s i =L′sin(Δ);h i =L′cos(Δ).

[0038] Beneficial effects: In the present invention, the inclinometer tube is buried as a protective outer tube, which can protect the device of the present invention. The inclinometer tube drives the protective sealing tube to deform synchronously, so that the deep horizontal displacement of the soft soil foundation can be monitored, ensuring the validity of the data.

[0039] Among them, during the installation process, there is no need to install the inclinometer in a cumbersome manner. It is only necessary to put the device into the inclinometer tube and inflate and pressurize it from the outside. When the air pressure is filled, the protective sealing tube device from the bottom of the inclinometer tube to the top of the inclinometer tube changes from a loose state to a vertical state, and the side support mechanism in the horizontal displacement monitoring mechanism is supported and connected with the inclinometer tube, which once again ensures that the developed device is in a vertical state in the inclinometer tube, thereby ensuring the integrity and usability of the device.

[0040] The horizontal displacement monitoring mechanism can be used to measure the distance and inclination between the front and rear devices in real time, and to correct the horizontal deformation distributed at different depths in real time. Compared with the existing monitoring methods, the real-time, authenticity and applicability of the data are guaranteed. In addition, the device recorded in the present invention monitors the deep horizontal displacement of the site foundation, so that the deep horizontal displacement of the foundation of the preloading site is not limited by the inconvenient site transportation, unfavorable environment of the construction site and extreme weather, and can timely and effectively guide the construction loading rate, greatly improving work efficiency. The function of automatic collection greatly improves the timeliness and accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0042] In the attached picture:

[0043] Figure 1 It is a structural schematic diagram of the horizontal displacement monitoring device of the present invention;

[0044] Figure 2 It is a structural schematic diagram of the horizontal displacement monitoring mechanism of the present invention;

[0045] Figure 3 is a top view of the horizontal displacement monitoring device of the present invention;

[0046] Figure 4 It is a structural schematic diagram of the counterweight chassis of the present invention;

[0047] Figure 5 It is a working schematic diagram of the horizontal displacement monitoring device of the present invention;

[0048] Figure 6 It is a schematic diagram of the structure of the horizontal displacement monitoring mechanism of the present invention when it is offset;

[0049] Numbers in the figure: 1. Inclinometer tube; 21. Inflatable inner tube; 22. Inflatable outer tube; 23. Air pipe connector; 31. Acoustic ranging sensor; 32. Inclination sensor; 33. Waterproof connector; 41. Support shaft; 42. Support rib; 43. Support block; 44. Center inflatable strip; 5. Groove; 6. Counterweight base; 61. Insert block; 7. Notch; 71. Locking hole; 81. Locking bead; 82. Special-shaped block; 83. Elastic airbag. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. The terms used in the implementation mode of the present invention are only used to explain the specific embodiments of the present invention, and are not intended to limit the present invention. The embodiments of the present application are described below in conjunction with the drawings.

[0051] Embodiment 1:

[0052] like Figure 1 As shown, a deep horizontal displacement monitoring device for soft soil foundation treatment includes an inclinometer tube 1, a protective sealing tube, a plurality of horizontal displacement monitoring mechanisms arranged at intervals in the protective sealing tube, and a side support mechanism is arranged on each horizontal displacement monitoring mechanism;

[0053] refer to Figure 1 As shown, the inclinometer tube 1 is pre-buried at the position to be measured, and the depth extends to at least the immovable soil layer;

[0054] In a specific case, a φ70mm inclinometer tube 1 is used, with an outer diameter of 70mm, a wall thickness of 5mm, and a rod length of 1000-2000mm, especially 1000mm; each tube connection of the φ70mm inclinometer tube 1 and the top and bottom are connected with screws and coated with glass glue;

[0055] refer to Figure 1As shown, the protective sealing tube is coaxially installed in the inclinometer tube 1, and the protective sealing tube includes a coaxially arranged inner inflation tube 21 and an outer inflation tube 22; an air pipe connector 23 is installed at the top of the protective sealing tube, and a one-way valve structure is arranged in the air pipe connector 23 to ensure that the gas does not leak out during inflation. The air pipe connector 23 is used to connect an external pressure device to inflate the inner inflation tube 21 and the outer inflation tube 22 as needed;

[0056] refer to Figure 1-Figure 2 As shown, the horizontal displacement monitoring mechanism includes a sonic ranging sensor 31 and a tilt sensor 32 disposed in the inflatable inner tube 21. For example, the tilt sensor 32 (204) has a range of 0-360°, a resolution of 0.002°, and an accuracy of 0.01°. The sonic ranging sensor 31 and the tilt sensor 32 are configured to monitor the distance and tilt of the previous horizontal displacement monitoring mechanism;

[0057] Among them, reference Figure 1-Figure 2 As shown, the horizontal displacement monitoring mechanism also includes a pair of waterproof connectors 33, the two waterproof connectors 33 are installed at intervals inside the inflatable inner tube 21, and the two waterproof connectors 33 and the inside of the inflatable inner tube 21 are enclosed to form a sealed chamber, and the acoustic ranging sensor 31 and the inclination sensor 32 are installed in the sealed chamber;

[0058] refer to Figure 2-Figure 3 As shown, the side support mechanism is configured to fit inside the inclinometer tube 1 when working, and transmit the force of the corresponding position of the inclinometer tube 1 to the horizontal displacement monitoring mechanism. The side support mechanism includes a plurality of support shafts 41 uniformly arranged along the circumferential direction, one end of the support shaft 41 is connected to the horizontal displacement monitoring mechanism, and the other end extends out of the inflatable outer tube 22. A plurality of grooves 5 are arranged inside the inclinometer tube 1, and the grooves 5 are configured to allow the support shafts 41 to slide in and guide each support shaft 41 to move along the route;

[0059] In addition, refer to Figure 3 As shown, the side support mechanism also includes a plurality of support ribs 42 uniformly arranged along the circumferential direction, the support ribs 42 are radially arranged inside the inflatable inner tube 21 and / or the inflatable outer tube 22, and the support ribs 42 are provided with: a central inflatable strip 44 and a plurality of support blocks 43, the plurality of support blocks 43 are radially connected in sequence inside the support ribs 42, and two adjacent support blocks 43 are movably connected; the central inflatable strip 44 runs through all the support blocks 43 and is connected to the inflatable inner tube 21 or the inflatable outer tube 22, and the central inflatable strip 44 controls all the support blocks 43 to be distributed in a radially collinear manner during inflation.

[0060] by Figure 3For example, the support block 43 is a triangular structure, and the top corner of the previous triangular support block 43 is movably connected to the midpoint of a bottom side of the next triangular support block 43. In the uninflated state, each support block 43 can be freely rotated and folded. When inflated, the two sides of the support rib 42 are first expanded and squeezed to reduce the moving space of the support block 43, and gradually guide the support blocks 43 to be arranged in a straight line. At the same time, the central inflatable strip 44 expands, further driving the support blocks 43 to be arranged in a straight line. Figure 3 As shown, when the bottom edge of the outermost support block 43 is subjected to force, it will be transmitted to the next triangular support block 43 through the top angle, and this process can be repeated to rigidly transmit the force of the outermost layer to the inner side, thereby improving the synchronization of the force on the inner side.

[0061] refer to Figure 1 and Figure 4 As shown, a counterweight base 6 is installed at the bottom end of the protective sealing tube, and a plurality of support shafts 41 are also evenly installed on the counterweight base 6 along the circumferential direction. The counterweight base 6 is configured to guide the protective sealing tube into the inclinometer tube 1 under the action of gravity; wherein, a notch 7 is provided at the bottom of the inclinometer tube 1, and an insert block 61 is installed at the bottom of the counterweight base 6, and a locking mechanism is installed on the insert block 61, and the locking mechanism is configured to lock the counterweight base 6 and the notch 7 when the inflatable inner tube 21 and the inflatable outer tube 22 are inflated, or to unlock the counterweight base 6 and the notch 7 when the inflatable inner tube 21 and the inflatable outer tube 22 are deflated.

[0062] In a specific case, the locking mechanism includes a plurality of locking beads 81 arranged along the circumference of the plug block 61. Holes may be provided on the surface of the plug block 61, and the locking beads 81 are installed in the holes. The holes ensure that the locking beads 81 will not fall off the plug block 61. A special-shaped block 82 is slidably installed in the plug block 61. The special-shaped block 82 has a structure such as a truncated cone structure, and has a gradually changing side surface. The locking beads 81 are squeezed and moved by the gradually changing side surface. An elastic airbag 83 is installed at one end of the special-shaped block 82. The elastic airbag 83 is connected to the inflatable inner tube 21 or the inflatable outer tube 22. A plurality of locking holes 71 are correspondingly provided on the inner wall of the notch 7. The elastic airbag 83 is configured as follows:

[0063] In the natural state, the elasticity of the self pulls the special-shaped block 82 to move to the first position, and the locking bead 81 can freely break away from the locking hole 71 and retract into the inside of the insert block 61;

[0064] In the inflated state, the special-shaped block 82 is pushed to move to the second position, and the special-shaped block 82 at the second position squeezes the locking bead 81 so that the part extends out of the insert block 61 and is inserted into the locking hole 71 .

[0065] Based on the above, the installation process of the device of the present invention is as follows:

[0066] Step 1: Before the construction of preloading on soft soil foundation, the point position is determined, and drilling is carried out at the design required point position, and the depth reaches the stable and immovable soil layer. Then the inclinometer tube 1 is buried first, and the bottom is connected with a bottom cover; the bottom of the inclinometer tube 1 is placed in the stable and immovable soil layer, which can ensure that the inclinometer tube 1 is in a fixed and immovable state, in a vertical state, and vertical to the soil level, and will not sink or settle, which plays a role of benchmark control;

[0067] Step 2: according to the buried length of the inclinometer tube 1, the position of the horizontal displacement monitoring mechanism is evenly distributed according to the tube length, and the horizontal displacement monitoring mechanism, the protective sealing tube and the counterweight chassis 6 are connected to form a whole;

[0068] Step 3: Align the support shaft 41 with the groove 5 in the inclinometer tube 1, and slowly place the counterweight base 6 along the tube. The counterweight base 6 has a certain weight, and the support shaft 41 is aligned with the groove 5 in the inclinometer tube 1 during the placement process, so that the entire assembly process will not cause knots or tangles.

[0069] Step 4: When the counterweight base 6 reaches the bottom of the inclinometer tube 1, the insert block 61 is inserted into the notch 7, and the air pipe connector 23 is connected to the external pressure device to inflate the inner and outer inflatable tubes 21 and 22 from no gas to full gas. The inner and outer inflatable tubes 21 and 22 are filled with gas pressure, and at the same time, the following levels of support are completed:

[0070] The inflatable inner tube 21 and the inflatable outer tube 22 are pushed up by air pressure, driving the support shaft 41 to fully contact the inner wall of the groove 5 of the inclinometer tube 1, and as the air pressure continues to increase, the protective sealing tube gradually changes from a soft state to a vertical state from the bottom to the top, and the support shaft 41 slowly slides up along the support shaft 41 until the entire protective sealing tube becomes a vertical state, and all parts are in a full pressure working state;

[0071] The elastic airbag 83 is pressurized to push the special-shaped block 82 to slide to the second position. The special-shaped block 82 squeezes the locking bead 81 so that the part extends out of the insert block 61 and is inserted into the locking hole 71, thereby locking the position of the counterweight chassis 6.

[0072] Each support rib 42 is inflated, and the central inflatable strip 44 is inflated synchronously, so that all the support blocks 43 are controlled to be distributed in a radially collinear manner;

[0073] Step 5: Install an automatic data collection device on the top of the pipe to automatically collect the test data of each horizontal displacement monitoring mechanism.

[0074] Embodiment 2:

[0075] The present invention also discloses a method for monitoring deep horizontal displacement of soft soil foundation treatment, which realizes full-automatic monitoring of deep horizontal displacement of soft soil foundation in a preloading site after the above device is installed, and specifically includes:

[0076] S1. Assemble the horizontal displacement monitoring device according to the above operations, and inflate the inner and outer inflatable tubes 21 and 22, so that the support shaft 41 is in full contact with the inner wall of the inclinometer casing 1, and all the support blocks 43 are distributed in a radially collinear manner;

[0077] S2. Connect the data of each horizontal displacement monitoring mechanism to the automatic acquisition device. The data can be copied from the automatic acquisition device using a USB flash drive or the like, or wireless data transmission can be adopted. A wireless transmission module can be installed in the automatic acquisition device to realize wireless data transmission. The data acquisition cycle and other parameters can be debugged according to the on-site pile load construction cycle to collect and transmit data;

[0078] S3. Reference Figure 5 As shown in Figure 2, during the preloading process, the soil will move outwards, as shown in Figure 2. Figure 5 As shown, the deformation of the inclinometer tube 1 is the deep horizontal displacement of the foundation soil. The inclinometer tube 1 is closely supported and contacted by the support shaft 41, driving the protective sealing tube and the horizontal displacement monitoring mechanism to also undergo certain deformation. After the deformation, the acoustic wave distance sensor 31 and the inclination sensor 32 in the horizontal displacement monitoring mechanism perform distance and inclination tests on the horizontal displacement monitoring device in front.

[0079] S4. Monitor the deep horizontal displacement of the foundation during soil deformation. Figure 6 As shown, the distance between the two horizontal displacement monitoring mechanisms is L when the protective sealing tubes are inflated and fully pressurized. After deformation, the protective sealing tubes will have a certain tensile deformation, that is, the distance between the two horizontal displacement monitoring mechanisms is L' when they are deformed, L' is L (original length) + ΔL (telescopic deformation), that is, the depth corresponding to the initial point is constantly changing with the deformation; the acoustic wave ranging sensor 31 can calculate the distance L' between the front and rear horizontal displacement monitoring mechanisms by generating acoustic waves, L'=v*t / 2, v is the acoustic wave speed, t is the time from emission to reception, and the change inclination angle Δ of the front and rear horizontal displacement monitoring mechanisms can be calculated through the data of the inclination sensor 32. According to the change inclination angle and the distance after change, the horizontal displacement value s of the front and rear horizontal displacement monitoring mechanisms is calculated, and the formula is: s i =L′sin(Δ), and the relative height h is also in the process of change, h i =L′cos(Δ), which can correct the depth value corresponding to the device in real time, thereby ensuring the accuracy and authenticity of the data;

[0080] S5. From bottom to top, the acoustic wave ranging sensor data 31 and the inclination sensor data 32 of the first horizontal displacement monitoring mechanism and the counterweight chassis are monitored to calculate the distance L′ and the inclination Δ of the first horizontal displacement monitoring mechanism; from bottom to top, the data of each horizontal displacement monitoring mechanism are obtained in sequence to calculate:

[0081] Horizontal displacement values ​​of each horizontal displacement monitoring mechanism:

[0082]

[0083] Among them, s i is the i-th horizontal displacement monitoring mechanism from bottom to top, n is the number of horizontal displacement monitoring mechanisms; the depth value of each horizontal displacement monitoring mechanism is:

[0084]

[0085] The deep horizontal displacement data of the soft soil foundation under preloading is automatically collected, and the deep horizontal settlement data of the site foundation during the preloading construction process are summarized and sorted out. The deep horizontal displacement monitoring results are sorted out to obtain the horizontal displacement of each measuring point, the horizontal displacement rate of each measuring point, the deep horizontal displacement curve, etc., to provide data support to ensure the safety and stability of the site foundation during the preloading construction process, and play an important guiding role in the quality of the entire construction process.

[0086] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions without departing from the principle of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A deep horizontal displacement monitoring device for soft soil foundation treatment, characterized in that: include: Inclinometer tube, pre-buried at the position to be measured, with the depth extending at least to the immovable soil layer; A protective sealing tube, coaxially installed in the inclinometer tube, the protective sealing tube comprising a coaxially arranged gas-filled inner tube and a gas-filled outer tube; and A plurality of horizontal displacement monitoring mechanisms are arranged at intervals in the protective sealing tube, and the horizontal displacement monitoring mechanisms include an acoustic wave ranging sensor and an inclination sensor arranged in the inflatable inner tube, and the acoustic wave ranging sensor and the inclination sensor are configured to monitor the distance and inclination of the previous horizontal displacement monitoring mechanism; Each of the horizontal displacement monitoring mechanisms is provided with a side support mechanism, and the side support mechanism is configured to fit inside the inclinometer tube when in operation, and transmit the force at the corresponding position of the inclinometer tube to the horizontal displacement monitoring mechanism.

2. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 1 is characterized by: An air pipe connector is installed at the top of the protective sealing tube, and a one-way valve structure is arranged inside the air pipe connector. The air pipe connector is used for externally connecting a pressure device to inflate the inner inflation tube and the outer inflation tube as needed.

3. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 1 is characterized by: The horizontal displacement monitoring mechanism also includes a pair of waterproof connectors, two of which are installed at intervals inside the inflatable inner tube, and the two waterproof connectors and the inside of the inflatable inner tube together form a sealed chamber, and the acoustic wave ranging sensor and the inclination sensor are installed in the sealed chamber.

4. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 2 is characterized by: The side support mechanism comprises a plurality of support shafts uniformly arranged along the circumferential direction, one end of the support shaft is connected to the horizontal displacement monitoring mechanism, and the other end extends out of the inflatable outer tube; and A plurality of grooves are arranged inside the inclinometer tube, and the grooves are configured to allow the support shafts to slide in and guide the support shafts to move along the route.

5. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 4 is characterized by: The side support mechanism further comprises a plurality of support ribs uniformly arranged along the circumferential direction, wherein the support ribs are radially arranged inside the inflatable inner tube and / or the inflatable outer tube, and the support ribs are provided with: A plurality of support blocks are sequentially connected along the radial direction inside the support rib, and two adjacent support blocks are movably connected; The central inflatable strip runs through all the support blocks and is connected with the inner inflatable tube or the outer inflatable tube. When inflating, the central inflatable strip controls all the support blocks to be distributed in a radial collinear manner.

6. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 4 is characterized by: A counterweight base is installed at the bottom end of the protective sealing tube, and a plurality of supporting shafts are evenly installed along the circumference of the counterweight base. The counterweight base is configured to guide the protective sealing tube into the inclinometer tube under the action of gravity.

7. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 6 is characterized by: A notch is provided at the bottom of the inclinometer tube, an insert block is installed at the bottom of the counterweight base, and a locking mechanism is installed on the insert block. The locking mechanism is configured to lock the counterweight base and the notch when the inflatable inner tube and the inflatable outer tube are inflated, or to unlock the counterweight base and the notch when the inflatable inner tube and the inflatable outer tube are deflated.

8. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 7 is characterized by: The locking mechanism includes a plurality of locking beads arranged along the circumference of the plug block, a special-shaped block is slidably installed in the plug block, an elastic airbag is installed at one end of the special-shaped block, the elastic airbag is connected to the inflatable inner tube or the inflatable outer tube, and a plurality of locking holes are correspondingly arranged on the inner wall of the notch; the elastic airbag is configured as follows: In a natural state, the elasticity of the self pulls the special-shaped block to move to the first position, and the locking bead can freely escape from the locking hole and retract into the inside of the plug block; In the inflated state, the special-shaped block is pushed to move to the second position, and the special-shaped block at the second position squeezes the locking bead part out of the plug block and is stuck in the locking hole.

9. A method for monitoring deep horizontal displacement in soft soil foundation treatment, characterized in that: The monitoring is performed based on the deep horizontal displacement monitoring device for soft soil foundation treatment according to any one of claims 4 to 8, specifically comprising: S1. Assemble the horizontal displacement monitoring device and inflate the inner and outer inflatable tubes so that the support shaft is in full contact with the inner wall of the inclinometer tube and all support blocks are distributed in radial collinearity. S2, connecting the data of each horizontal displacement monitoring mechanism to the automatic acquisition device; S3, from bottom to top, the first horizontal displacement monitoring mechanism monitors the acoustic distance sensor data and the inclination sensor data of the counterweight chassis, and calculates the distance L′ and the inclination Δ of the first horizontal displacement monitoring mechanism; S4. Obtain the data of each horizontal displacement monitoring mechanism in sequence from bottom to top and calculate: Horizontal displacement values ​​of each horizontal displacement monitoring mechanism: Among them, s i is the i-th horizontal displacement monitoring mechanism from bottom to top, and n is the number of horizontal displacement monitoring mechanisms; Depth values ​​of each horizontal displacement monitoring mechanism: adjusting the horizontal displacement value of the adjacent horizontal displacement monitoring mechanism in real time based on the depth value; S5. Count the horizontal displacement values, calculate the horizontal displacement rate, and draw the deep horizontal displacement curve. S4. Based on the distance L′ and the change inclination angle Δ, the horizontal displacement values ​​s of the upper and lower horizontal displacement monitoring mechanisms are obtained, and the formula is: s=L′*sin(Δ).

10. The method for monitoring deep horizontal displacement of soft soil foundation treatment according to claim 9, characterized in that: Based on the data of the acoustic wave ranging sensor, the distance L' between the upper and lower horizontal displacement monitoring mechanisms of the acoustic wave ranging sensor is calculated. The formula is: L'=v*t / 2, v is the speed of the acoustic wave, t is the time from transmission to reception; s i =L′sin(Δ);h i =L′cos(Δ).

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