Settlement monitoring device and method in highway complex soft foundation roadbed construction

Abstract

The invention discloses a settlement monitoring device and method in highway complex soft foundation roadbed construction, and relates to the technical field of settlement monitoring, the settlement monitoring device is arranged in a monitoring drill hole, the settlement monitoring device comprises a monitoring rod, the monitoring rod is fixed at the top of the monitoring drill hole, and the bottom of the monitoring rod is suspended; the magnetic ring mounting assembly is arranged outside the monitoring rod in a sleeving manner and can move in a reciprocating manner in the length direction of the monitoring rod; a magnetic ring mounting shell is arranged outside the magnetic ring, and the magnetic ring mounting shell can be embedded into the monitoring drill hole; wherein the magnetic ring mounting assembly can carry the magnetic ring to a specified position, and assists the magnetic ring mounting shell to be embedded into the monitoring drill hole, so that the magnetic ring mounting shell is tightly combined with the monitoring drill hole, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of settlement monitoring, and particularly to a settlement monitoring device and method for the construction of a complex soft foundation subgrade of an expressway. Background Art

[0002] A soft foundation subgrade refers to a type of subgrade in which the water content in the soil is relatively high and has reached a saturated state, resulting in larger gaps between the soils.

[0003] The main problems existing in the soft foundation subgrade during the construction of expressways include subgrade settlement and landslides, etc. These problems are mainly caused by the characteristics of the soft foundation subgrade such as weak bearing capacity, poor permeability, large voids, and high compressibility. Subgrade settlement not only affects the driving safety of expressways but may also lead to traffic accidents. And the subgrade landslide further reduces the stability of the expressway.

[0004] Therefore, during the construction of a complex soft foundation subgrade of an expressway, settlement monitoring is a key link to ensure the project quality and safety.

[0005] At present, a settlement magnetic ring is often used in cooperation with a magnetic induction rod for settlement monitoring. However, when installing the magnetic ring, the magnetic ring is often directly sent to the deep part of the monitoring hole and treated by backfilling. In fact, it is difficult for the magnetic ring to effectively combine with the soft foundation soil layer.

[0006] For example, the publication number is: CN219568808U, which discloses a soil settlement monitoring device for accurately arranging settlement magnetic rings, relating to the field of soft soil foundation settlement monitoring. The soil settlement monitoring device for accurately arranging settlement magnetic rings includes a fixed pipe, a probe that can move along the inside of the fixed pipe, a layered settlement meter connected to the probe, a plurality of magnetic settlement magnetic rings, and a plurality of fixing rings made of water-soluble materials. The fixing rings are used to limit the position of the settlement magnetic rings sleeved on the outer wall of the fixed pipe. It can effectively send the magnetic ring to the designated position. However, in fact, even at this time, through the backfilling technology, it is still difficult for the magnetic ring to effectively combine with the soft foundation soil layer.

[0007] Therefore, it is necessary to provide a settlement monitoring device and method for the construction of a complex soft foundation subgrade of an expressway to solve the above problems. Summary of the Invention

[0008] To solve the above problems, the present invention provides the following technical solution: A settlement monitoring device for the construction of a complex soft foundation subgrade of an expressway, which is arranged in a monitoring borehole and includes:

[0009] A monitoring rod, which is fixed at the top of the monitoring borehole, and the bottom of the monitoring rod is suspended;

[0010] A magnetic ring installation assembly, which is sleeved outside the monitoring rod and can reciprocate along the length direction of the monitoring rod;

[0011] A magnetic ring is externally provided with a magnetic ring mounting shell, and the magnetic ring mounting shell can be embedded into the monitoring borehole;

[0012] Wherein, the magnetic ring mounting assembly can carry the magnetic ring to a designated position and assist the magnetic ring mounting shell to be embedded into the monitoring borehole.

[0013] Further, preferably, the magnetic ring mounting shell includes a shell, the shell is of a cylindrical structure, and the shell is provided with two groups of anchoring components arranged symmetrically, and each group is a plurality of circumferentially equally spaced.

[0014] Further, preferably, the anchoring component includes an anchor block, a driving plate and a hinge seat, wherein the anchor block radially slides through the shell;

[0015] The hinge seat is fixed on the inner wall of the shell, the driving plate is hinged on the hinge seat, and the driving plate deflects under the drive of the magnetic ring mounting assembly and then pushes the anchor block into the inner wall of the monitoring borehole.

[0016] Further, preferably, a torsion spring is further arranged between the hinge seat and the driving plate. In the initial stage, the torsion spring can limit the driving plate and keep it away from the anchor block.

[0017] Further, preferably, a delayed expansion mechanism is embedded outside the shell.

[0018] Further, preferably, the magnetic ring mounting assembly includes:

[0019] A mounting seat, in which a guide cylinder is embedded, and a plurality of locking cylinders are embedded in the guide cylinder;

[0020] A plurality of moving locking assemblies circumferentially equally spaced, the moving locking assembly includes two symmetrically distributed legs, one end of the leg is hinged to the mounting seat, the other end is rotatably provided with a wheel body, and at least one wheel body is driven by a motor;

[0021] Wherein, an adjusting mechanism is hinged between the two legs of the moving locking assembly.

[0022] Further, preferably, the adjusting mechanism is a spring.

[0023] Further, preferably, the adjusting mechanism is an adjusting rod.

[0024] Further, preferably, strain gauges are embedded in at least two of the legs, and the two legs with strain gauges are at different heights.

[0025] A settlement monitoring method for the construction of a highway complex soft subgrade includes the following steps:

[0026] S1. Construct a monitoring borehole;

[0027] S2. Lower a monitoring rod and sleeved a magnetic ring installation assembly outside the monitoring rod;

[0028] S3. Set a magnetic ring installation shell outside the magnetic ring and sleeved the magnetic ring outside the magnetic ring installation assembly;

[0029] S4. Use the magnetic ring installation assembly to carry the magnetic ring to a designated position and assist the magnetic ring installation shell to be embedded into the monitoring borehole, and then the magnetic ring installation assembly is reset;

[0030] S5. Repeat S3 - S4 until multiple magnetic rings are installed;

[0031] S6. Remove the magnetic ring installation assembly, fix the monitoring rod at the top of the monitoring borehole, and lift the monitoring rod so that its bottom is suspended, and then carry out backfilling treatment;

[0032] S7. Use the relative position change between the magnetic ring and the monitoring rod to conduct settlement monitoring.

[0033] Compared with the prior art, the present invention provides a settlement monitoring device and method for the construction of a complex soft foundation subgrade of an expressway, and has the following beneficial effects:

[0034] In the present invention, the magnetic ring installation assembly can carry the magnetic ring to a designated position and assist the magnetic ring installation shell to be embedded into the monitoring borehole, so that it is closely combined with the monitoring borehole, improving the monitoring accuracy. In the present invention, through the circumferential equally spaced distribution of multiple anchoring components, the omnidirectional fixation of the shell can be realized, thereby enhancing its stability. Description of the Drawings

[0035] Figure 1 It is a structural schematic diagram of the settlement monitoring device for the construction of a complex soft foundation subgrade of an expressway;

[0036] Figure 2 It is a three - dimensional structural schematic of the magnetic ring installation assembly in the settlement monitoring device for the construction of a complex soft foundation subgrade of an expressway Figure 1 ;

[0037] Figure 3 It is a three - dimensional structural schematic diagram of the magnetic ring installation assembly and the magnetic ring installation shell in the settlement monitoring device for the construction of a complex soft foundation subgrade of an expressway;

[0038] Figure 4 It is a three - dimensional structural schematic of the magnetic ring installation assembly in the settlement monitoring device for the construction of a complex soft foundation subgrade of an expressway Figure 2 ;

[0039] Figure 5It is a flow chart of the settlement monitoring method in the construction of the complex soft foundation subgrade of the expressway;

[0040] In the figure: 1. Monitoring borehole; 2. Monitoring rod; 3. Magnetic ring installation assembly; 4. Magnetic ring; 5. Magnetic ring installation shell; 31. Installation seat; 32. Guide cylinder; 33. Locking cylinder; 34. Leg; 35. Wheel body; 36. Motor; 37. Spring; 38. Adjusting rod; 51. Shell; 52. Anchor block; 53. Driving plate; 54. Hinge seat. Specific implementation mode

[0041] The terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of this application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0042] Example 1: Please refer to Figures 1 - 3 , Figure 5 , in the embodiment of the present invention, a settlement monitoring device in the construction of the complex soft foundation subgrade of the expressway is provided. It is arranged in the monitoring borehole 1 and includes:

[0043] The monitoring rod 2 is fixed at the top of the monitoring borehole 1, and the bottom of the monitoring rod 2 is suspended;

[0044] The magnetic ring installation assembly 3 is sleeved outside the monitoring rod 2 and can reciprocate along the length direction of the monitoring rod 2;

[0045] The magnetic ring 4 is provided with a magnetic ring installation shell 5 outside, and the magnetic ring installation shell 5 can be embedded into the monitoring borehole 1;

[0046] Among them, the magnetic ring installation assembly 3 can carry the magnetic ring 4 to a designated position and assist the magnetic ring installation shell 5 to be embedded into the monitoring borehole 1.

[0047] During implementation, it includes the following steps:

[0048] Step 1: Construct the monitoring borehole 1;

[0049] Step 2: Lower the monitoring rod 2 and sleeved the magnetic ring installation assembly 3 outside the monitoring rod 2;

[0050] Step 3: Set a magnetic ring mounting shell 5 outside the magnetic ring 4, and sleeved the magnetic ring 4 outside the magnetic ring mounting component 3;

[0051] Step 4: Use the magnetic ring mounting component 3 to carry the magnetic ring 4 to the designated position, and assist the magnetic ring mounting shell 5 to be embedded into the monitoring borehole 1, and then the magnetic ring mounting component 3 resets;

[0052] Step 5: Repeat Step 3 to Step 4 until multiple magnetic rings 4 are installed;

[0053] Step 6: Remove the magnetic ring mounting component 3, fix the monitoring rod 2 at the top of the monitoring borehole 1, and lift the monitoring rod 2 so that its bottom is suspended, and then carry out backfilling treatment;

[0054] Step 7: Use the relative position change between the magnetic ring 4 and the monitoring rod 2 to carry out settlement monitoring.

[0055] Among them, by setting multiple magnetic rings 4 in the monitoring borehole 1 and using the relative position change between the magnetic ring 4 and the monitoring rod 2 to carry out settlement monitoring, high-precision measurement of subgrade settlement can be realized, improving the accuracy of monitoring results.

[0056] In addition, the magnetic ring mounting component 3 can carry the magnetic ring 4 to the designated position and assist the magnetic ring mounting shell 5 to be embedded into the monitoring borehole. In this way, the installation position of the magnetic ring 4 can be flexibly adjusted according to actual needs, so as to meet different monitoring requirements. At the same time, by increasing the number and distribution of the magnetic rings 4, the monitoring range can be further expanded and the monitoring accuracy can be improved.

[0057] Among them, the magnetic ring mounting shell 5 includes a shell body 51, the shell body 51 is a cylindrical structure, and there are two groups of anchoring components symmetrically arranged on the shell body 51, and each group is a plurality of circumferentially equally spaced.

[0058] Specifically, there are two groups of anchoring components symmetrically arranged on the shell body 51, and each group is a plurality of circumferentially equally spaced. In this way, the magnetic ring mounting shell 5 can be more firmly embedded into the monitoring borehole 1 to prevent it from shifting or falling off during use.

[0059] The main function of the anchoring component is to fix the shell body 51 on the hole wall of the monitoring borehole 1. Through the coordinated action of multiple anchoring components, the stability and reliability of the magnetic ring mounting shell 5 during monitoring can be ensured.

[0060] Through the circumferentially equally spaced distribution of multiple anchoring components, the all-round fixation of the shell body 51 can be realized, thereby enhancing its stability.

[0061] The anchor assembly includes an anchor block 52, a drive plate 53 and a hinge seat 54, wherein the anchor block 52 radially slides through the housing 51;

[0062] The hinge seat 54 is fixed on the inner wall of the shell 51 , and the driving plate 53 is hinged on the hinge seat 54 . The driving plate 53 is deflected under the drive of the magnetic ring mounting assembly 3 to push the anchor block 52 to anchor into the inner wall of the monitoring borehole 1 .

[0063] During the installation of the magnetic ring 4, the magnetic ring installation assembly 3 will carry the magnetic ring 4 and the magnetic ring installation shell 5 to the specified position. At this time, the magnetic ring installation assembly 3 will push the driving plate 53 to deflect. The deflection of the driving plate 53 will drive the anchor block 52 to slide radially and anchor into the inner wall of the monitoring borehole 1, thereby fixing the position of the magnetic ring installation shell 5.

[0064] The anchoring effect of the anchor block 52 can ensure the stability of the magnetic ring mounting shell 5 during the monitoring process, and prevent it from being relatively displaced due to uneven force or environmental factors.

[0065] Furthermore, a torsion spring is provided between the hinge seat 54 and the driving plate 53 . In an initial stage, the torsion spring can restrict the driving plate 53 and keep it away from the anchor block 52 .

[0066] The torsion spring can limit the driving plate 53 in the initial stage, so that it remains at a position away from the anchor block 52. It is ensured that the driving plate 53 will not accidentally push the anchor block 52 when there is no external force, thereby avoiding possible damage or misoperation during installation or transportation.

[0067] The presence of the torsion spring also increases the overall stability of the anchor assembly. When subjected to external forces, the torsion spring can provide additional damping effect to reduce the shaking of the drive plate 53 and the anchor block 52.

[0068] Furthermore, a delayed expansion mechanism is embedded outside the shell 51 .

[0069] By providing a delayed expansion mechanism, when the magnetic ring mounting shell 5 moves to a specified position, the magnetic ring mounting shell 5 can be initially positioned in the monitoring borehole 1 to facilitate subsequent installation of the magnetic ring mounting assembly 3 on the housing 51 .

[0070] The delayed expansion mechanism may be a chemical expansion plug:

[0071] The chemical expansion plug is usually composed of an expansion plug body, a chemical expansion agent and a trigger device. The expansion plug body has an expandable head, which is filled with a chemical expansion agent. The trigger device is used to activate the chemical expansion agent when needed, causing it to undergo a chemical reaction and produce a large amount of gas, thereby pushing the expansion of the expansion plug head.

[0072] After the magnetic ring mounting shell 5 is lowered into the monitoring borehole 1, the triggering device is activated, and the chemical expander slowly undergoes a chemical reaction and generates gas. When the magnetic ring mounting shell 5 reaches the designated position, these gases slowly fill the cavity of the expansion plug head and push it to expand outward until it forms a tight contact and fixation with the monitoring borehole 1.

[0073] The described delayed expansion mechanism can be a thermal expansion plug:

[0074] The thermal expansion plug is made of a thermal expansion material and is usually cylindrical or conical. This material expands in volume when heated, thereby pushing the plug body to move outward. The thermal expansion plug may contain a heating element or a thermosensitive material that responds to changes in ambient temperature.

[0075] After the magnetic ring mounting shell 5 is lowered into the monitoring borehole 1, the heating element is activated and slowly heats the thermal expansion material. When the magnetic ring mounting shell 5 reaches the designated position, the thermal expansion material gradually expands. The expanded plug body gradually moves outward until it forms a tight contact and fixation with the monitoring borehole 1.

[0076] In this embodiment, the magnetic ring mounting assembly 3 includes:

[0077] A mounting seat 31, inside which a guiding cylinder 32 is embedded, and a plurality of locking cylinders 33 are embedded in the guiding cylinder 32;

[0078] A plurality of moving locking assemblies evenly distributed at circumferential intervals, the moving locking assembly includes two symmetrically distributed legs 34, one end of the leg 34 is hinged to the mounting seat 31, the other end is rotatably provided with a wheel body 35, and at least one wheel body 35 is driven by a motor 36;

[0079] Wherein, an adjusting mechanism is hinged between the two legs 34 in the moving locking assembly.

[0080] The adjusting mechanism is an adjusting rod 38.

[0081] In addition, strain gauges are embedded in at least two of the legs 34, and the two legs 34 with strain gauges are at different heights.

[0082] Wherein, the wheel body 35 can not only position the magnetic ring 4, but also realize movement and drive the driving plate 53. In specific implementation, it includes the following steps:

[0083] Step 1: When the magnetic ring mounting assembly 3 carries the magnetic ring 4 and the magnetic ring mounting shell 5 to the designated position, the adjusting rod 38 is in a contracted state, and the wheel body 35 tightly presses on the magnetic ring 4. At this time, the strain gauge senses a large pressure, indicating that the magnetic ring 4 is positioned and locked by the wheel body 35.

[0084] Step 2: Through the delay inflation mechanism, the magnetic ring mounting shell 5 is preliminarily positioned in the monitoring borehole 1.

[0085] Step 3: The adjusting rod 38 extends, and the pressure of the wheel body 35 on the magnetic ring 4 decreases. At this time, the wheel body 35 can be slightly pressed on the magnetic ring to prepare for the next movement.

[0086] Step 4: The wheel body 35 moves along the magnetic ring 4 driven by the motor. Since the pressure of the wheel body 35 on the magnetic ring 4 is small at this time, it can move easily.

[0087] Step 5: When the wheel body 35 moves to the position of the driving plate 53, the reading of the strain gauge changes, indicating that the wheel body 35 has reached the target position.

[0088] Step 6: The adjusting rod 38 contracts again, and the wheel body 35 presses tightly on the driving plate. Due to the increased pressure, the driving plate deflects.

[0089] Step 7: The deflection of the driving plate pushes the anchor block 52 to anchor into the inner wall of the monitoring borehole 1, thus completing the fixation.

[0090] Based on this, in this embodiment, a settlement monitoring method for highway complex soft foundation subgrade construction is also provided, including the following steps:

[0091] S1. Construct the monitoring borehole 1;

[0092] S2. Lower the monitoring rod 2, and sleeved a magnetic ring mounting assembly 3 outside the monitoring rod 2;

[0093] S3. Set a magnetic ring mounting shell 5 outside the magnetic ring 4, and sleeved the magnetic ring 4 outside the magnetic ring mounting assembly 3;

[0094] S4. Use the magnetic ring mounting assembly 3 to carry the magnetic ring 4 to the designated position, and assist the magnetic ring mounting shell 5 to embed into the monitoring borehole 1, and then the magnetic ring mounting assembly 3 resets;

[0095] S5. Repeat S3 - S4 until multiple magnetic rings 4 are installed;

[0096] S6. Remove the magnetic ring mounting assembly 3, fix the monitoring rod 2 at the top of the monitoring borehole 1, and lift the monitoring rod 2 so that its bottom is suspended, and carry out backfilling treatment;

[0097] S7. Use the relative position change between the magnetic ring 4 and the monitoring rod 2 to conduct settlement monitoring.

[0098] Example 2: Please refer to Figure 4, which is different from Embodiment 1 in that: the adjusting mechanism is a spring 37. Therefore, in this embodiment, the structure of the adjusting mechanism is relatively simple, and the self-adaptive adjustment is realized only through the elasticity of the spring 37. There may be certain deficiencies in its adjustment accuracy, but the overall manufacturing cost is low and the control is simple.

[0099] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A settlement monitoring device for complex soft foundation roadbed construction on a highway, which is arranged in a monitoring borehole (1) and is characterized in that: include: A monitoring rod (2) fixed to the top of the monitoring borehole (1), and the bottom of the monitoring rod (2) is suspended in the air; A magnetic ring mounting assembly (3), which is sleeved on the outside of the monitoring rod (2) and is capable of reciprocating along the length direction of the monitoring rod (2); A magnetic ring (4), the exterior of which is provided with a magnetic ring mounting shell (5), wherein the magnetic ring mounting shell (5) can be embedded in the monitoring borehole (1); The magnetic ring mounting assembly (3) is capable of carrying the magnetic ring (4) to a specified position and assisting the magnetic ring mounting shell (5) to be embedded in the monitoring borehole (1).

2. The settlement monitoring device for complex soft foundation construction of expressway according to claim 1 is characterized in that: The magnetic ring mounting shell (5) comprises a shell (51), the shell (51) is a cylindrical structure, and two groups of anchoring components are symmetrically arranged on the shell (51), each group comprising a plurality of anchoring components distributed at equal intervals around the circumference.

3. The settlement monitoring device for complex soft foundation construction of expressway according to claim 2 is characterized in that: The anchoring assembly comprises an anchor block (52), a drive plate (53) and a hinge seat (54), wherein the anchor block (52) radially slides through the housing (51); The hinge seat (54) is fixed on the inner wall of the shell (51), and the drive plate (53) is hinged on the hinge seat (54). The drive plate (53) is deflected under the drive of the magnetic ring mounting assembly (3) to push the anchor block (52) to anchor into the inner wall of the monitoring borehole (1).

4. The settlement monitoring device for complex soft foundation roadbed construction of highway according to claim 3 is characterized in that: A torsion spring is also provided between the hinge seat (54) and the drive plate (53). In the initial stage, the torsion spring can restrict the drive plate (53) and keep it away from the anchor block (52).

5. The settlement monitoring device for complex soft foundation construction of expressway according to claim 3 is characterized in that: A delayed expansion mechanism is embedded outside the shell (51).

6. The settlement monitoring device for complex soft foundation roadbed construction of highway according to claim 1 is characterized in that: The magnetic ring mounting assembly (3) comprises: A mounting seat (31) having a guide cylinder (32) embedded therein, wherein a plurality of locking cylinders (33) are embedded in the guide cylinder (32); A plurality of movable locking assemblies distributed at equal intervals around a circle, the movable locking assemblies comprising two symmetrically distributed legs (34), one end of the legs (34) being hinged to the mounting seat (31), and the other end being rotatably provided with a wheel body (35), and at least one wheel body (35) being driven by a motor (36); Wherein, an adjustment mechanism is hinged between the two legs (34) in the movable locking assembly.

7. The settlement monitoring device for complex soft foundation construction of expressway according to claim 6 is characterized in that: The adjustment mechanism is a spring (37).

8. The settlement monitoring device for complex soft foundation roadbed construction of expressway according to claim 6 is characterized in that: The adjustment mechanism is an adjustment rod (38).

9. The settlement monitoring device for complex soft foundation roadbed construction of expressway according to claim 8, characterized in that: Strain gauges are embedded in at least two of the legs (34), and the two legs (34) with the strain gauges are located at different heights.

10. A method for monitoring settlement during construction of a complex soft foundation of a highway, which uses a settlement monitoring device as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. Construction of monitoring borehole (1); S2. Lower the monitoring rod (2) and set a magnetic ring mounting assembly (3) on the outside of the monitoring rod (2); S3. A magnetic ring mounting shell (5) is arranged outside the magnetic ring (4), and the magnetic ring (4) is sleeved on the outside of the magnetic ring mounting assembly (3); S4. Using the magnetic ring mounting assembly (3) to carry the magnetic ring (4) to a specified position, and assisting the magnetic ring mounting shell (5) to be embedded into the monitoring borehole (1), and then resetting the magnetic ring mounting assembly (3); S5. Repeat S3-S4 until multiple magnetic rings (4) are installed; S6. Take out the magnetic ring mounting assembly (3), fix the monitoring rod (2) to the top of the monitoring borehole (1), and lift the monitoring rod (2) so that its bottom is suspended, and then backfill; S7. Perform settlement monitoring by utilizing the relative position change between the magnetic ring (4) and the monitoring rod (2).

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