A pavement surface settlement monitoring device and working method

Abstract

The present application relates to a kind of road surface ground subsidence monitoring devices and working method, including sleeve, top is equipped with cover plate, the diameter of sleeve upper portion is greater than the diameter of barrel portion, the plane formed in the junction of sleeve upper portion and barrel is equipped with backing plate, sleeve upper portion contains subsidence monitoring module, barrel contains filler;Subsidence monitoring module includes vertically arranged subsidence measuring rod, subsidence measuring rod bottom end is fixed in original soil layer, top end is connected with horizontally arranged fixed rod, fixed rod two ends are connected with displacement sensor, the top pin of displacement sensor is in abutment with backing plate, the subsidence plate of filler top is arranged power level;Data module is located in sleeve and is connected with displacement sensor and power level, obtains and transmits subsidence data.

Description

Technical Field

[0001] This invention relates to the field of surface settlement monitoring technology, specifically to a road surface settlement monitoring device and its working method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Shield tunneling allows tunnels to be built without disrupting surface traffic, but the construction process can cause ground subsidence. To avoid the hazards of surface subsidence, settlement monitoring of the surface road surface in the affected area of ​​the shield tunnel construction is necessary to ensure safety during the tunneling process.

[0004] Currently, the process of monitoring surface pavement settlement requires drilling holes of specific depth and width on the pavement and inserting monitoring sensors into these holes to monitor the settlement. The process of setting up monitoring points involves multiple steps, including drilling, sensor installation, backfilling, and curing. Due to the complexity and large number of steps, the sensors inside the holes are easily disturbed by external factors, resulting in insufficient accuracy of the settlement data. Furthermore, poor sealing of the holes can lead to rainwater accumulation, causing changes in the soil composition and resulting in additional settlement displacement of the sensors, leading to an overestimation of the monitored settlement. Summary of the Invention

[0005] In order to solve the technical problems existing in the background art, the present invention provides a road surface settlement monitoring device and working method, which collects settlement data at settlement monitoring points by means of displacement sensors and dynamic level instruments that follow the settlement of the undisturbed soil layer.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a road surface settlement monitoring device, comprising:

[0008] The sleeve has a cover plate at the top. The diameter of the upper part of the sleeve is larger than the diameter of the body. A pad is provided on the plane formed at the connection between the upper part of the sleeve and the body. The upper part of the sleeve accommodates the settlement monitoring module, and the body accommodates the filling material.

[0009] The settlement monitoring module includes a vertically arranged settlement measuring rod, the bottom of which is fixed in the undisturbed soil layer, and the top of which is connected to a horizontally arranged fixed rod. Displacement sensors are connected to both ends of the fixed rod, and the pins of the displacement sensors abut against the pad. A dynamic level is arranged on the settlement plate on top of the filling material.

[0010] The data module, located inside the sleeve and connected to the displacement sensor and dynamic level, acquires and transmits settlement data.

[0011] The top of the sleeve is provided with a coaxially fitted annular tenon groove, and the surface of the cover plate is provided with an annular mortise corresponding to the annular tenon groove structure.

[0012] The inner side of the sleeve is equipped with an anti-corrosion layer.

[0013] A sealing ring is provided inside the annular tenon groove.

[0014] The settlement measuring rod is arranged vertically, and its bottom end is fixed in the original soil layer by the filling material. Two displacement sensors are located on both sides of the settlement measuring rod. The top of the settlement measuring rod is lower than the opening of the sleeve. A settlement plate is installed on the top of the filling material, and a dynamic level is installed on the settlement plate.

[0015] The pad is set on the plane formed at the connection between the upper part of the sleeve and the cylinder body, and its upper surface abuts against the pin of the displacement sensor.

[0016] The settlement measuring rod follows the settlement changes of the undisturbed soil layer, and the displacement sensor is activated by the fixed rod to obtain the first set of settlement data.

[0017] The filling material, along with the settlement plate, settles along with the original soil layer, and a second set of settlement data is obtained using a dynamic level.

[0018] The data module is located inside the sleeve and is configured to: receive the first set of settlement data acquired by the displacement sensor and the second set of settlement data acquired by the dynamic level; send the acquired settlement data to the database; and issue an early warning when the acquired settlement data exceeds the warning limit.

[0019] A second aspect of the present invention provides a method for operating the above-described apparatus, comprising the following steps:

[0020] According to the monitoring needs, multiple monitoring points are set up in the settlement-affected area. The soil samples taken from the monitoring points are cleaned after drilling to form the monitoring holes.

[0021] The sleeve is placed inside the measuring hole, with the bottom of the sleeve inserted into the original soil layer and the top of the sleeve not exceeding the height of the road surface.

[0022] Install the settlement measuring rod along the axis of the sleeve. The bottom of the settlement measuring rod is inserted into the original soil layer, and the top is set at a distance from the road surface. Fill the measuring hole with filler material, and place a settlement plate on top of the filler material.

[0023] The pad is placed on the plane formed by the connection between the upper part of the sleeve and the cylinder body. The displacement sensor is connected to the fixed rod, which is connected to the set height position of the settlement measuring rod. After the displacement sensor pin abuts against the pad, the initial compression value is set. The dynamic level is placed on the settlement plate.

[0024] The data module is connected to the inner wall of the sleeve, and the data module receives data from the displacement sensor and the dynamic level.

[0025] After the sealing ring is fitted onto the top of the sleeve, the cover plate is connected to the sleeve, and the location of the measuring point is marked.

[0026] The data module is used to obtain settlement data of the measuring points by using displacement sensors and dynamic level instruments.

[0027] 1. The settlement measuring rod follows the settlement change of the undisturbed soil layer. The displacement sensor is activated by the fixed rod to obtain a set of settlement data. The filling material and settlement plate follow the settlement change of the undisturbed soil layer and obtain another set of settlement data through the dynamic level. The two sets of settlement data use different types of sensors, but they come from the same measuring point, which can obtain more accurate settlement values ​​that are closer to the actual engineering requirements.

[0028] 2. The sleeve and cover plate are joined by annular tenon and mortise joints, forming a labyrinth seal structure, which can significantly reduce the amount of rainwater intruding into the sleeve. Combined with the sealing ring, it can improve the waterproof sealing performance of the monitoring point.

[0029] 3. The inner wall of the sleeve is equipped with an anti-corrosion layer to prevent the sleeve from being eroded and damaged by rainwater. At the same time, the components inside the sleeve are far away from the bottom of the hole and the cover plate to avoid interference from rainwater and the external environment on the measurement results of the components, thereby further improving the accuracy of settlement monitoring. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a schematic diagram of the structure of a road surface settlement monitoring device provided in one or more embodiments of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the protective sleeve in the road surface settlement monitoring device provided in one or more embodiments of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the protective cover plate in the road surface settlement monitoring device provided in one or more embodiments of the present invention;

[0034] Figure 4 This is a schematic diagram of the installation process of the road surface settlement monitoring device provided in one or more embodiments of the present invention;

[0035] Figure 5 This is a schematic diagram of the working process of the road surface settlement monitoring device provided in one or more embodiments of the present invention;

[0036] In the diagram: 1-Steel protective sleeve, 2-Corrosion-resistant plastic sleeve inner wall, 3-Waterproof sealing ring, 4-Data module, 5-Fixing rod, 6-Displacement sensor, 7-Settlement measuring rod (threaded rebar rod), 8-Steel protective cover plate, 9-Displacement sensor pin pad, 10-Dynamic level, 11-Settlement plate, 12-Fine sand, 13-Concrete and gravel. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] The existing process for setting up surface road settlement monitoring points is as follows:

[0040] The first step is to use a drilling machine to drill a cylindrical hole with a diameter of about 200mm and a depth of about 50mm at the selected burial point.

[0041] The second step is to use a small-diameter drilling machine to drill holes to a depth down to the roadbed or undisturbed soil layer.

[0042] The third step is to place the monitoring equipment in a suitable position inside the drilled hole;

[0043] The fourth step is to pour concrete and gravel into the bottom of the hole, and after the concrete dries, add fine sand to fill the appropriate position of the cavity.

[0044] Fifth, install a protective cover on the top of the hole and allow it to cure for at least 14 days.

[0045] This method ensures that the detection equipment is not affected by pedestrians and vehicles on the ground, and can work normally and stably without being damaged.

[0046] Because the above process requires multiple steps, the strength of the resulting test holes is not ideal, the seal is not tight, and the data extraction depends on manual reading.

[0047] The following embodiments provide a road surface settlement monitoring device and its working method. Settlement data at settlement monitoring points are collected using displacement sensors and dynamic levels. The collected settlement data is uploaded to a cloud database via a data transmission device. The settlement data stored in the database can be displayed on a settlement monitoring platform. If the settlement exceeds a preset threshold on a certain day, the data transmission device will send an early warning message to the platform and management personnel.

[0048] Example 1:

[0049] like Figure 1 As shown, a road surface settlement monitoring device includes:

[0050] The sleeve has a cover plate at the top and the bottom abuts against the original soil layer. The diameter of the upper part of the sleeve is larger than the diameter of the body. A pad is provided on the plane formed by the connection between the upper part of the sleeve and the body. The upper part of the sleeve accommodates the settlement monitoring module, and the body accommodates the filling material.

[0051] The settlement monitoring module includes a vertically arranged settlement measuring rod 7, the bottom of which is fixed in the original soil layer, and the top is connected to a horizontally arranged fixed rod 5. The two ends of the fixed rod 5 are connected to displacement sensors 6, the pins of the displacement sensors 6 abut against the pad, and the settlement plate on top of the filling material is connected to a dynamic level 10.

[0052] The data module, located inside the sleeve, is connected to the displacement sensor and dynamic level to acquire settlement data.

[0053] like Figures 2-3 As shown, the top of the sleeve is provided with a coaxially fitted annular tenon groove, and a sealing ring is provided inside the annular tenon groove. The surface of the cover plate is provided with an annular mortise corresponding to the structure of the annular tenon groove. The inner side of the sleeve is provided with an anti-corrosion layer.

[0054] In this embodiment, the sleeve utilizes a steel protective sleeve 1 as the outer protective sleeve of the device. The outer layer is made of wear-resistant steel material, and the inner wall 2 is made of anti-corrosion plastic material. The cross-section of the annular tenon groove is U-shaped, and it is detachably connected to the cover plate through two inner and outer U-shaped annular tenon grooves.

[0055] In this embodiment, the cover plate is a steel protective cover 8, with the outer layer made of wear-resistant steel material and the inner layer made of anti-corrosion plastic material. It is vertically inserted into the corresponding U-shaped annular tenon groove in the steel protective sleeve 1 through the annular mortise interface to realize the detachable connection between the sleeve and the cover plate.

[0056] In this embodiment, the sealing ring is a waterproof sealing ring 3, which is placed in the annular groove of the U-shaped annular tenon joint of the steel protective sleeve 1. Since the annular tenon joint and the annular mortise joint form a labyrinth seal structure, the amount of rainwater intruding into the sleeve can be greatly reduced. Combined with the sealing ring, the waterproof sealing performance of the monitoring point can be improved.

[0057] In this embodiment, the filling materials from bottom to top are concrete, crushed stone 13, and fine sand 12. The settlement measuring rod (threaded steel bar rod) 7 serves as a benchmark for measuring the settlement, with its top lower than the cover plate and its bottom located in the original soil layer.

[0058] Two displacement sensors 6 are positioned on either side of the settlement measuring rod 7. The settlement measuring rod 7 (threaded steel bar rod) descends in height as the undisturbed soil layer settles, causing the displacement sensors 6 to move via the fixing rod 5, thus acquiring the first set of settlement data. Simultaneously, the settlement of the undisturbed soil layer triggers the settlement of the filling material, resulting in the dynamic level 10, positioned on the settlement plate 11, acquiring the second set of settlement data. Both sets of settlement data utilize different types of sensors but originate from the same measuring point. The average of the two sets of settlement data obtained from the displacement sensors is used as the settlement value for that point, and the average of the two sets of settlement values ​​collected by the dynamic level is also used as the settlement value for that point. This approach yields more accurate settlement values ​​that better reflect the actual engineering requirements.

[0059] Data module 4 is fixed to the inner wall 2 of the anti-corrosion plastic sleeve and includes functions such as data acquisition unit, data transmission unit and data early warning unit.

[0060] The data acquisition unit obtains settlement values ​​by monitoring the settlement change trend of the settlement measuring rod 7 through the displacement sensor 6, and the dynamic level 10 is placed on the settlement plate 11 to monitor the change trend of its own position at all times to collect settlement data.

[0061] The data transmission unit sends the settlement data acquired by the data acquisition unit to the database. In this embodiment, the monitored settlement data can be uploaded to the cloud database for storage via wireless and Bluetooth devices, and the actual settlement data can be automatically obtained on terminals such as computers, mobile phones, and tablets.

[0062] When the acquired settlement data exceeds the warning limit, the data warning unit issues a warning. In this embodiment, the data warning unit is used to send warning information to relevant management personnel and the platform. When the settlement value detected by the sensor exceeds a certain threshold, the warning information will be sent to relevant management personnel and the platform in a timely manner, so that countermeasures can be taken for the settlement monitoring point to prevent the settlement disaster from developing further.

[0063] Example 2:

[0064] The operating method of the above-mentioned device includes the installation process of the device (e.g. Figure 4 (as shown) and the data acquisition and transmission process after installation (such as...) Figure 5 As shown), specifically:

[0065] Step 1: Plan and set up multiple monitoring points near the surface of the underground construction site. Set up monitoring sections with a spacing of 10m between monitoring points. Bury 11 monitoring points on each monitoring section with a spacing of 3-5m.

[0066] Step 2: First, at the selected burial point, use a core drilling machine to drill a hole with a diameter of 150mm and a depth of 80mm in the concrete or asphalt pavement. After drilling to the original soil layer with a core drilling machine with a diameter of 140mm, clean the debris in the hole and pour in an appropriate amount of water.

[0067] Step 3: Place the steel protective sleeve 1 into the drilled hole and insert its bottom into the original soil layer, so that the top is slightly lower than the road surface height;

[0068] Step 4: The bottom of the settlement measuring rod 7 is driven into the original soil layer along the center of the hole, leaving a gap of approximately 50mm between the top of the rod and the road surface. Then, gravel is placed at the bottom of the hole, and concrete is injected to secure the rod. After the concrete dries, fine sand is filled in to a depth of 20mm from the bottom of the hole, ensuring the settlement measuring rod remains perpendicular to the ground. A circular settlement plate 11 is placed on the surface of the fine sand, and the settlement measuring rod 7 is positioned in the center ring of the settlement plate 11.

[0069] Step 5: Fix the displacement sensor pin pad 9 onto the sleeve platform. Pass the connecting wires of the two displacement sensor heads 6 through the wire holes of the fixing rod 5, and use glue to tightly connect the top of the displacement sensor 6 to the lower surface of the fixing rod 5. Weld the fixing rod at an appropriate height on the settlement measuring rod 7 so that the pin of the displacement sensor 6 abuts against the pad (the pad can be pre-set with a groove). Set an initial compression value as a monitoring indicator.

[0070] Step 6: Fix the dynamic level 10 to the settlement plate to monitor settlement changes, and connect the level and the supporting monitoring equipment with cables and sleeves to obtain relevant information;

[0071] Step 7: Fix the data module on the inner wall 2 of the protective sleeve, and connect the displacement sensor and the data transmission device by bridging to collect the data in the sensor and upload it to the cloud;

[0072] Step 8: Align the tenon joints of the steel protective cover and the steel protective sleeve and fasten them together. Then, mark the protective cover with red paint to indicate its number.

[0073] Step 9: This method obtains four sets of settlement data: four sets measured by displacement sensors and one set measured by a dynamic level. These data are uploaded to the cloud via data transmission codes. Settlement data can be automatically retrieved on mobile phones, tablets, computers, and other terminals. The average of the four sets of data from the displacement sensors is taken as the surface settlement value for that monitoring point, or the data from the dynamic level is used as the surface settlement value. If a settlement point exceeding the threshold is detected, the embedded NB-IoT module in the data transmission settings will be activated to issue an early warning. The NB-IoT module will then send the warning information to the management personnel.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A road surface settlement monitoring device, characterized in that, include: The sleeve has a cover plate on top. The diameter of the upper part of the sleeve is larger than the diameter of the body. A pad is provided on the plane formed by the connection between the upper part of the sleeve and the body. The upper part of the sleeve accommodates the settlement monitoring module, and the body accommodates the filler. The top of the sleeve is provided with a coaxially sleeved annular tenon groove, and the surface of the cover plate is provided with an annular mortise corresponding to the annular tenon groove structure. The settlement monitoring module includes a vertically arranged settlement measuring rod, the bottom of which is fixed in the undisturbed soil layer, and the top of which is connected to a horizontally arranged fixing rod. Displacement sensors are connected to both ends of the fixing rod, with the sensor pins abutting against a pad. A dynamic level is installed on the settlement plate at the top of the filling material. The settlement measuring rod moves with the undisturbed soil layer as it settles, and the fixing rod drives the displacement sensors to acquire the first set of settlement data. The filling material, along with the settlement plate, moves with the undisturbed soil layer as it settles, and the dynamic level acquires the second set of settlement data. The data module, located inside the sleeve and connected to the displacement sensor and dynamic level, acquires and transmits settlement data.

2. The road surface settlement monitoring device as described in claim 1, characterized in that, The inner side of the sleeve is provided with an anti-corrosion layer.

3. The road surface settlement monitoring device as described in claim 1, characterized in that, The annular tenon groove is equipped with a sealing ring.

4. The road surface settlement monitoring device as described in claim 1, characterized in that, The data module is located inside the sleeve and is configured to: receive a first set of settlement data acquired by a displacement sensor and a second set of settlement data acquired by a dynamic level; send the acquired settlement data to a database; and issue an early warning when the acquired settlement data exceeds the warning limit.

5. A method for monitoring road surface settlement based on the device described in any one of claims 1-4, characterized in that, Includes the following steps: According to the monitoring needs, multiple monitoring points are set up in the settlement-affected area. The soil samples taken from the monitoring points are cleaned after drilling to form the monitoring holes. The sleeve is placed inside the measuring hole, with the bottom of the sleeve inserted into the original soil layer and the top of the sleeve not exceeding the height of the road surface. Install the settlement measuring rod along the axis of the sleeve. The bottom of the settlement measuring rod is inserted into the original soil layer, and the top is set at a distance from the road surface. Fill the measuring hole with filler material, and place a settlement plate on top of the filler material. The pad is placed on the plane formed by the connection between the upper part of the sleeve and the cylinder body. The displacement sensor is connected to the fixed rod, which is connected to the set height position of the settlement measuring rod. After the displacement sensor pin abuts against the pad, the initial compression value is set. The dynamic level is placed on the settlement plate. The data module is connected to the inner wall of the sleeve, and the data module receives data from the displacement sensor and the dynamic level. After the sealing ring is fitted onto the top of the sleeve, the cover plate is connected to the sleeve, and the location of the measuring point is marked. The data module is used to obtain settlement data of the measuring points by using displacement sensors and dynamic level instruments.

Images