A steel sheet pile settlement monitoring device for silt geology foundation pit support

Abstract

The utility model discloses a steel sheet pile settlement monitoring devices for silt geology foundation pit support mainly relates to steel sheet pile settlement monitoring field. Including datum stake body, with datum stake body connection's datum support, with datum support hinged's conduction pole, with conduction pole connection's fixed base, datum stake body needs to penetrate silt layer to reach lower stable bearing stratum, be equipped with steel wire rope connection between conduction pole and fixed base, fixed base is connected with steel sheet pile, be equipped with sensor on conduction pole, sensor is used for monitoring the position change of conduction pole. The utility model has the beneficial effect that: for the silt geology foundation pit support steel sheet pile settlement monitoring, device structure simple flexibility is high, and the monitoring effect is intuitive, and the cost is low, and the reading precision is high, is fit for carrying out the popularization. And will not be affected by silt geology and lead to datum error, and can according to the risk point found in the process of foundation pit excavation, increase monitoring point in time, fast.

Description

Technical Field

[0001] This utility model relates to the field of steel sheet pile settlement monitoring, specifically a steel sheet pile settlement monitoring device for foundation pit support in silty sand geology. Background Technology

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

[0003] Due to its high water content, high compressibility, and high permeability, silty sand geology presents challenges compared to conventional soil conditions. Concrete structures formed in silty sand geology exhibit poor forming stability, difficulty in ensuring structural integrity, and insufficient long-term durability. These problems not only affect the service life of the project but may also lead to safety hazards. Silty sand combines the cohesiveness of silt with the permeability of sand, making it prone to quicksand and liquefaction under vibration or seepage. This results in a sharp increase in lateral pressure and a rapid decrease in soil strength. Therefore, the instability of sheet pile supports in silty sand geology needs to be addressed. To prevent settlement of sheet piles during service and consequently affect project quality, settlement monitoring of the sheet piles is necessary.

[0004] Traditional monitoring methods for steel sheet piles in silty sand geology are subject to numerous influences and are costly. For example, total stations are greatly affected by on-site geological conditions, and the operation is time-consuming, labor-intensive, and cannot provide continuous monitoring. Static levels are another option, but they are expensive and prone to damage, thus increasing project costs. Therefore, a new steel sheet pile settlement monitoring device is needed to overcome the errors caused by environmental factors. Utility Model Content

[0005] The purpose of this invention is to provide a steel sheet pile settlement monitoring device for foundation pit support in silty sand geology. This device is used to monitor the settlement of steel sheet piles supporting foundation pits in silty sand geology. It features a simple and flexible structure, intuitive monitoring results, low cost, and high reading accuracy, making it suitable for widespread application. Furthermore, it is not affected by the silty sand geology, preventing benchmark errors, and monitoring points can be added quickly and easily based on risk points discovered during foundation pit excavation.

[0006] To achieve the above objectives, this utility model employs the following technical solution: A steel sheet pile settlement monitoring device for foundation pit support in silty sand geology includes a reference pile body, a reference support connected to the reference pile body, a transmission rod hinged to the reference support, and a fixed seat connected to the transmission rod. The reference pile body needs to penetrate the silty sand layer to reach the lower stable bearing layer. A steel wire rope is provided between the transmission rod and the fixed seat, and the fixed seat is connected to the steel sheet pile. A sensor is provided on the transmission rod, and the sensor is used to monitor the position change of the transmission rod.

[0007] The transmission rod includes a power arm and a resistance arm, wherein the length of the power arm is shorter than that of the resistance arm.

[0008] The sensor includes a displacement sensor, which is mounted on the resistance arm.

[0009] The fixing seat is magnetically connected to the steel sheet pile.

[0010] The sensor includes an angular displacement sensor, which is mounted on the hinge axis between the reference bracket and the transmission rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This device, used for monitoring the settlement of sheet piles supporting foundation pits in silty sand geology, features a simple and flexible structure, provides intuitive monitoring results, is low-cost, and offers high reading accuracy, making it suitable for widespread application. Furthermore, it is unaffected by the silty sand geology, preventing baseline errors, and monitoring points can be quickly added as needed based on risk points discovered during foundation pit excavation. For example, if signs of water seepage are detected, a monitoring point can be immediately added to the nearby sheet piles. Attached Figure Description

[0012] Appendix Figure 1 This is an overall view of the device of this utility model.

[0013] Appendix Figure 2 This utility model provides a monitoring view of multiple monitoring points.

[0014] The labels shown in the attached diagram: 1. Base pile; 2. Base support; 3. Transmission rod; 4. Fixing seat; 5. Wire rope; 6. Power arm; 7. Resistance arm; 8. Displacement sensor; 9. Crossbeam; 10. Connecting beam. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0016] This utility model describes a steel sheet pile settlement monitoring device for foundation pit support in silty sand geology, as shown in the attached drawings of the specification. Figure 1 As shown, the main structure includes a reference pile 1, a reference support 2 connected to the reference pile 1, a transmission rod 3 hinged to the reference support 2, and a fixed seat 4 connected to the transmission rod 3; The reference pile 1 is one or a group of miniature steel pipe piles driven into the area outside the influence zone of the foundation pit. Its depth needs to penetrate the silty sand layer and reach the underlying stable bearing layer, such as clay or dense sand, thus serving as a stable and fixed reference. The reference support 2 is connected to the reference pile 1. The reference support 2 is L-shaped and extends towards the foundation pit. A transmission rod 3 is hinged at the end of the reference support 2 near the foundation pit. The transmission rod 3 includes a power arm 6 and a resistance arm 7, with the power arm 6 being shorter than the resistance arm 7. The power arm 6 of the transmission rod 3 is connected to a fixed seat 4 via a steel wire rope 5. The fixed seat 4 is magnetically connected to the sheet pile. The fixed seat 4 is a powerful magnet that can firmly adhere to the sidewall or flange of the sheet pile, thus achieving connection. After connection, when the sheet pile settles, the sheet pile and the connecting seat move synchronously, causing the transmission rod 3 to rotate around the hinge point with the reference support 2.

[0017] Since the hinge points of the power arm 6 and the resistance arm 7 with the guide rod 3 form a lever structure, when the steel sheet pile drives the wire rope 5 and the power arm 6 to move through the connecting seat, the resistance arm 7 will also move synchronously. Therefore, their angular displacements are the same, but their linear displacements are different due to their different lengths. Furthermore, the magnitude of the linear displacements of the power arm 6 and the resistance arm 7 is proportional to their respective lengths. Therefore, monitoring the longer resistance arm 7 is more intuitive.

[0018] Therefore, there are multiple methods for monitoring the resistance arm 7. Method 1 involves equipping the end of the resistance arm 7 of the transmission rod 3 with a displacement sensor 8. This sensor monitors the vertical height change of the transmission rod 3. The linear displacement mentioned above refers to the arc length of the resistance arm 7. In fact, based on the arc length formula, S = r × θ, where s is the arc length of the linear displacement of the resistance arm 7, r is the vertical height displacement, and θ is the angle of change. When the displacement sensor 8 measures the height displacement r of the resistance arm 7, since the linear displacements of the power arm 6 and the resistance arm 7 are proportional to their lengths and their angles of change are the same, it can be deduced that the vertical displacement of the power arm 6 is also proportional to its length. Therefore, the settlement of the sheet pile can be calculated. Because the resistance arm 7 is long and the displacement amplitude is amplified, the monitoring effect of the resistance arm 7 is better, and the monitoring results are more accurate.

[0019] Method 2 involves using an angular displacement sensor, which is mounted on the hinge axis between the reference support 2 and the guide rod 3. By monitoring the rotation angle of the guide rod 3 using the angular displacement sensor, the settlement of the sheet pile can be directly calculated using trigonometric functions and arm length calculations.

[0020] Both of the above methods can monitor the settlement of sheet piles. Therefore, the sensor is connected to the control system. When the sensor's monitoring data exceeds or approaches the set value, the control system will promptly issue a prompt to remind the engineers to deal with the settlement area in a timely manner.

[0021] The above only describes the monitoring of a single sheet pile. This scheme can also be flexibly extended to the entire foundation pit, thereby realizing a distributed multi-point monitoring network. The number of reference piles 1 can be adjusted according to the size of the foundation pit, as shown in the attached diagram of the instruction manual. Figure 2 As shown, the original reference support 2 is augmented with a crossbeam 9 and a connecting beam 10. A transmission rod 3 and the required sensor are then hinged onto the connecting beam 10. Furthermore, key point deployment can be implemented: representative sheet piles can be selected as monitoring points at the external corners (turning points), the middle section (where the mid-span displacement is greatest), and sections adjacent to important buildings or pipelines, or they can be deployed at intervals, etc.

[0022] In summary, this device is used for monitoring the settlement of sheet piles supporting foundation pits in silty sand geology. The device has a simple and flexible structure, provides intuitive monitoring results, is low-cost, and offers high reading accuracy, making it suitable for widespread application. Furthermore, it is not affected by the silty sand geology, preventing baseline errors, and monitoring points can be added quickly and easily based on risk points discovered during foundation pit excavation. For example, if signs of water seepage are detected, a monitoring point can be immediately added to the nearby sheet piles.

Claims

1. A steel sheet pile settlement monitoring device for foundation pit support in silty sand geology, characterized in that: It includes a reference pile body (1), a reference support (2) connected to the reference pile body (1), a transmission rod (3) hinged to the reference support (2), and a fixed seat (4) connected to the transmission rod (3). The reference pile (1) needs to penetrate the silty sand layer to reach the lower stable bearing layer. The guide rod (3) is connected to the fixed seat (4) by a steel wire rope (5). The fixed seat (4) is connected to the steel sheet pile. The transmission rod (3) is equipped with a sensor, which is used to monitor the position change of the transmission rod (3).

2. The steel sheet pile settlement monitoring device for foundation pit support in silty sand geology according to claim 1, characterized in that: The transmission rod (3) includes a power arm (6) and a resistance arm (7), wherein the length of the power arm (6) is less than that of the resistance arm (7).

3. The steel sheet pile settlement monitoring device for foundation pit support in silty sand geology according to claim 2, characterized in that: The sensor includes a displacement sensor (8), which is mounted on the resistance arm (7).

4. The steel sheet pile settlement monitoring device for foundation pit support in silty sand geology according to claim 1, characterized in that: The fixing seat (4) is magnetically connected to the steel sheet pile.

5. The steel sheet pile settlement monitoring device for foundation pit support in silty sand geology according to claim 1, characterized in that: The sensor includes an angular displacement sensor, which is mounted on the hinge axis between the reference bracket (2) and the transmission rod (3).

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