A gnss-based ground surface displacement monitoring device

Abstract

The application belongs to the technical field of landslide monitoring and positioning equipment, and discloses a ground surface displacement monitoring device based on GNSS, which has a reference station and a measurement station. The measurement station and the reference station are arranged on the ground surface of a monitoring area to interact with data and correct the real-time position by the satellite positioning coordinates. The device comprises a rod as the reference station and the measurement station, a ground-buried concrete block on the ground surface of the monitoring area, and a fixed connection between the rod and the concrete block. The rod comprises a vertical rod, an antenna, a solar panel and a control box arranged at the top end of the vertical rod. The control box is provided with a solar cell connected with the solar panel. The concrete block comprises a surface sliding type and a deep fixed type. The surface sliding type concrete block is provided with a reinforcing structure in the horizontal direction, and the maximum thickness and the embedding depth of the surface sliding type concrete block are both less than five meters. The deep fixed type concrete block is provided with a reinforcing structure in the vertical direction, and the embedding depth of the deep fixed type concrete block into the ground is not less than fifteen meters.

Description

Technical Field

[0001] This invention belongs to the technical field of landslide monitoring and positioning equipment, specifically relating to a surface displacement monitoring device based on GNSS. Background Technology

[0002] GNSS displacement monitoring stations, also known as GNSS monitoring stations or GNSS displacement monitors, consist of a base station and a measuring station. They are characterized by high accuracy, low power consumption, high cost-effectiveness, and portable installation. The device can upload data to an environmental monitoring platform via 4G or Ethernet, is powered by solar energy, and its installation is not limited by geographical location or terrain.

[0003] The GNSS displacement monitoring station mainly consists of a GNSS antenna, solar panels, a main control chassis (containing a main control transmission module), and mounting brackets. It comprises two parts: a base station and measurement stations. This equipment can upload data to an environmental monitoring platform via a 4G signal network. It is suitable for monitoring surface displacement and building deformation, such as landslides, slope displacement, bridge deformation, reservoir dams, and mining geological hazards. The base station uses imported, precise coordinates combined with satellite positioning coordinates to calculate corrected satellite positioning data through an internal program. This corrected data is then transmitted to each measurement station via LoRa wireless communication. The measurement stations, using satellite positioning coordinates and the corrected data from the base station, upload the corrected data to the platform via the 4G network. Upon receiving the relevant information from the measurement stations, the platform processes and analyzes it. If an anomaly is detected, an alarm is immediately triggered, thereby comprehensively understanding the geological conditions of the monitored area, enabling coordinated disaster relief and prevention, and establishing an intelligent geological disaster monitoring and early warning system.

[0004] Existing GNSS displacement monitoring equipment is mostly fixed in structure, essentially connected to the surface soil of the area. While it can periodically monitor slowly shifting soil layers, it doesn't offer effective monitoring for sudden geological disasters like landslides. The main problem is that these fixed monitoring devices are typically mounted on poles, requiring placement on the soil surface in areas with a certain degree of stability. If placed in areas with a high probability of landslides, the equipment can easily topple and be covered or directly damaged by landslides, rendering it ineffective for prediction and monitoring in the event of a landslide or debris flow. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a surface displacement monitoring device based on GNSS. By limiting the structural utilization and connection relationship of concrete blocks, it is applicable to surface displacement monitoring processes with different recording methods, ensuring the stability of the equipment while accurately monitoring the nearby soil surface layer as needed.

[0006] The technical solution adopted in this invention is as follows:

[0007] In a first aspect, the present invention provides a surface displacement monitoring device based on GNSS, which has a reference station and a measuring station. The measuring station and the reference station are set on the ground in the monitoring area to interact with each other and perform real-time position correction by comparing with satellite positioning coordinates. The device includes poles that serve as the reference station and the measuring station. The ground in the monitoring area where the poles are located has buried concrete blocks, and the poles are fixedly connected to the concrete blocks.

[0008] The pole includes a pole and an antenna, a solar panel, and a control box mounted on top of the pole. The control box contains solar cells that are connected to the solar panel.

[0009] The concrete blocks include two types: surface sliding type and deep fixed type. The surface sliding type concrete blocks have a horizontally reinforced structure, and the maximum thickness and embedment depth of the surface sliding type concrete blocks are both less than five meters. The deep fixed type concrete blocks have a vertically reinforced structure, and their insertion depth into the ground is not less than fifteen meters.

[0010] In conjunction with the first aspect, the present invention provides a first embodiment of the first aspect, wherein in the surface sliding concrete block, the reinforcing structure includes a main steel mesh and several secondary steel meshes, the upright has an end inserted into the main steel mesh, and is fixedly connected to the end by a reinforcing rib located in the middle of the main steel mesh during installation.

[0011] In conjunction with the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, wherein the main steel reinforcement mesh and the secondary steel reinforcement mesh are both hollow woven tube structures, the thickness of the secondary steel reinforcement mesh is less than that of the main steel reinforcement mesh, and the secondary steel reinforcement mesh is arranged on both sides of the main steel reinforcement mesh and is equidistantly spaced in a parallel manner on the top surface.

[0012] In conjunction with the second embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, wherein the main steel reinforcement mesh and the secondary steel reinforcement mesh have a plurality of main reinforcement bars arranged along the length direction, and a clamp sleeved on the outside of the column formed by the main reinforcement bars and welded to all the main reinforcement bars, wherein the reinforcing bar is connected to the main reinforcement bars and the clamp simultaneously.

[0013] In conjunction with the third embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein the secondary steel reinforcement mesh is provided with a support rod, one end of the support rod is inserted into the secondary steel reinforcement mesh and connected to the clamp, the other end extends out of the secondary steel reinforcement mesh and the concrete block, and its end is connected to the upright;

[0014] Each secondary steel reinforcement grid has at least two support rods, all of which are arranged in a ring around the upright and have the same end connected to the same position on the upright.

[0015] In conjunction with the fourth embodiment of the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the concrete block in which the main steel reinforcement mesh is located has a cavity, and the top of the cavity has a pressure cap fixed by bolts;

[0016] The upright is a hollow structure, and a storage device is installed inside the cavity of the concrete block to connect to the control box. The storage device records all process data of the control box.

[0017] In conjunction with the first aspect or several embodiments of the first aspect, the present invention provides a sixth embodiment of the first aspect, wherein the deep-fixed concrete block is an anti-slip pile with a burial depth of not less than 15 meters, the anti-slip pile has a plurality of vertical steel bars extending along its length direction, and has an installation part at the top of the anti-slip pile, the installation part having a horizontal steel mesh connecting the tops of all the vertical steel bars, and the upright is fixed in the horizontal steel mesh.

[0018] In conjunction with the sixth embodiment of the first aspect, the present invention provides a seventh embodiment of the first aspect, wherein an equipment box is provided on the upright, the equipment box has several openings, and each opening is provided with a pull sensor. One end of the pull sensor is connected to a pull rope, which extends out of the equipment box and outward to the ground, and connects to a test pin set on the ground. When the test pin is fixed to the ground, the corresponding pull rope is in a taut state. The pull sensor provides data feedback based on the tension of the pull rope, and each pull rope has a maximum pulling force. When the force on the test pin exceeds the maximum pulling force, the corresponding pull rope is disconnected at the equipment box.

[0019] In conjunction with the seventh embodiment of the first aspect, the present invention provides an eighth embodiment of the first aspect, wherein several probes of different lengths are fixed in the ground and connected to soil layers of different depths, and the probes are marked with a pull sensor corresponding to the burial depth of each probe.

[0020] In conjunction with the seventh embodiment of the first aspect, the present invention provides a ninth embodiment of the first aspect, wherein the upright is provided with a protective net, the protective net is set on the mounting part of the concrete block and fixedly connected to the embedded horizontal steel mesh.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention defines two types of concrete blocks: surface sliding and deep fixed, corresponding to two different monitoring methods. The surface sliding structure not only reinforces the surface soil around the pole, preventing soil slippage from affecting the pole's stability, but also allows the entire concrete block to move as a whole with the surrounding surface soil. This ensures equipment stability while maintaining monitoring and data transmission, avoiding the problem of equipment damage due to landslides rendering the monitoring ineffective. The deep fixed structure ensures minimal equipment displacement on the ground and uses additional guy ropes and measuring pins for monitoring and feedback, making it suitable for monitoring loose soil layers prone to landslides. Attached Figure Description

[0023] Figure 1 This is a side view of the surface displacement monitoring device according to the first embodiment of the present invention;

[0024] Figure 2 This is a top view of the surface displacement monitoring device according to the first embodiment of the present invention;

[0025] Figure 3 This is an isometric view of the surface displacement monitoring device according to the first embodiment of the present invention;

[0026] Figure 4 This is a side view of the surface displacement monitoring device of the first embodiment of the present invention after the concrete block has been removed;

[0027] Figure 5 This is an isometric view of the surface displacement monitoring device of the first embodiment of the present invention after the concrete block has been removed;

[0028] Figure 6 This is a side view of the surface displacement monitoring device according to the second embodiment of the present invention;

[0029] Figure 7 This is a top view of the surface displacement monitoring device according to the second embodiment of the present invention;

[0030] Figure 8 This is an isometric view of the surface displacement monitoring device according to the second embodiment of the present invention;

[0031] Figure 9 This is a side view of the surface displacement monitoring device of the second embodiment of the present invention after the concrete block has been removed;

[0032] Figure 10 This is an isometric view of the surface displacement monitoring device of the second embodiment of the present invention after the concrete block has been removed.

[0033] In the diagram: 1-Concrete block, 2-Upright pole, 3-Antenna, 4-Solar panel, 5-Control box, 6-Support pole, 7-Main steel mesh frame, 8-Secondary steel mesh frame, 9-Reinforcing bar, 10-Pull rope, 11-Surveying nail, 12-Pull sensor. Detailed Implementation

[0034] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0040] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Example 1:

[0042] This embodiment discloses a ground displacement monitoring device based on GNSS, specifically comprising a base station and a measuring station. The measuring station and the base station are set on the ground in the monitoring area to exchange data and perform real-time position correction by comparing with satellite positioning coordinates. The device includes poles serving as the base station and the measuring station. The ground in the monitoring area where the poles are located has buried concrete blocks 1, and the poles are fixedly connected to the concrete blocks 1. The poles include a pole 2 and an antenna 3, a solar panel 4, and a control box 5 set at the top of the pole 2. The control box 5 contains a solar cell connected to the solar panel 4.

[0043] The concrete block 1 includes two types: surface sliding type and deep fixed type. The surface sliding type concrete block 1 has a horizontal reinforcing structure, and the maximum thickness and embedment depth of the surface sliding type concrete block 1 are both less than five meters. The deep fixed type concrete block 1 has a vertical reinforcing structure, and its insertion depth into the ground is not less than fifteen meters.

[0044] Among them, different monitoring methods are used for two types of concrete blocks, namely surface sliding type and deep fixed type, and these methods are further optimized.

[0045] Among them, reference Figures 1-5 The figure shows a surface-sliding concrete block 1. In the concrete block 1, the reinforcing structure includes a main steel mesh 7 and several secondary steel mesh 8. The uprights 2 have ends that are inserted into the main steel mesh 7 and are fixedly connected to the ends by reinforcing ribs 9 located in the middle of the main steel mesh 7 during installation.

[0046] Both the main steel reinforcement mesh 7 and the secondary steel reinforcement mesh 8 are hollow, perforated woven tube structures. The thickness of the secondary steel reinforcement mesh 8 is less than that of the main steel reinforcement mesh 7. The secondary steel reinforcement mesh 8 is arranged on both sides of the main steel reinforcement mesh 7 and is equidistantly spaced with its top surface parallel to the surface. The main steel reinforcement mesh 7 and the secondary steel reinforcement mesh 8 have several main reinforcement bars arranged along their length, as well as clamps fitted around the outside of the column formed by the main reinforcement bars and welded to all the main reinforcement bars. The reinforcing bars 9 are connected to the main reinforcement bars and the clamps simultaneously.

[0047] Furthermore, the secondary steel reinforcement mesh 8 is provided with support rods 6. One end of the support rod 6 is inserted into the secondary steel reinforcement mesh 8 and connected to the clamp, while the other end extends out of the secondary steel reinforcement mesh 8 and the concrete block 1, and its end is connected to the upright 2. Each secondary steel reinforcement mesh 8 is provided with at least two support rods 6. All support rods 6 are arranged in a ring around the upright 2 and have the same end connected to the same position on the upright 2.

[0048] Reference Figure 2 A secondary steel mesh frame 8 is symmetrically arranged on both sides of the main steel mesh frame 7. Two support rods 6 are symmetrically arranged on each secondary steel mesh frame 8, and the support rods 6 are connected to the fixing rings sleeved on the main rod. Figure 2 The relative positional relationship of the support rods 6 is shown. The support rods 6 on both sides provide good support for the main rod, and refer to... Figure 1 and Figure 4 The arrangement of the concrete block 1 and the steel mesh in the monitoring method for surface sliding can be determined. The integrated concrete block 1 structure has a large horizontal footprint and can form a good connection and stability with the surrounding soil, which increases its overall anti-sliding effect. A small amount of water and soil loss will not affect the stability of the equipment. In the event of a large-scale landslide or other geological disaster, the concrete block 1 can move along with the surrounding soil, and its large horizontal footprint further improves its stability.

[0049] In this embodiment, a gyroscope is installed on the concrete block 1 or the upright 2. The gyroscope is used to determine whether a sudden geological disaster has occurred. If a large change in posture is detected in the concrete block 1, it is determined that a rapid geological disaster has occurred and the relevant process is initiated. The control box 5 then controls the entire equipment to shorten the monitoring and data transmission cycle during the landslide process, so as to improve the timeliness of detection as much as possible.

[0050] Meanwhile, since this surface-sliding concrete block 1 will shift along with the surrounding soil, to prevent damage to the equipment from extreme landslides or debris flows, and to preserve monitoring data throughout the process, a cavity is provided within the concrete block 1 containing the main steel reinforcement mesh 7. The top of this cavity has a bolt-fixed cap. The upright 2 is a hollow structure, and a storage device for connecting the control box 5 is installed within the cavity of the concrete block 1. This storage device records all process data from the control box 5. Even if management personnel cannot understand the situation in the area when the equipment is damaged, they can trace the source through subsequent equipment recovery, thus providing strong data support for future geological hazard modeling or analysis.

[0051] As another implementation method, refer to Figures 6-10The diagram illustrates a deep-fixed concrete block 1 and a vertical pole 2 structure. The deep-fixed concrete block 1 is an anti-slip pile with a burial depth of not less than fifteen meters. The anti-slip pile has several vertical reinforcing bars extending along its length. At the top of the anti-slip pile is an installation section containing a horizontal reinforcing mesh connecting the tops of all the vertical reinforcing bars. The vertical pole 2 is fixed within this horizontal reinforcing mesh.

[0052] The term "deep-fixed" means that the concrete block 1 has a deep installation position, which not only prevents landslides but also ensures that the equipment installed on it remains in place in the event of geological disasters such as landslides or soil displacement, thus avoiding damage to the equipment and affecting the monitoring effect after the geological disaster.

[0053] Furthermore, an equipment box is provided on the upright pole 2. The equipment box has several openings, and each opening is equipped with a pull sensor 12. One end of the pull sensor 12 is connected to a pull rope 10. The pull rope 10 extends out of the equipment box and out to the ground, connecting with a test nail 11 set on the ground. When the test nail 11 is fixed to the ground, the corresponding pull rope 10 is in a taut state. The pull sensor 12 provides data feedback based on the tension of the pull rope 10. Each pull rope 10 has a maximum pulling force. When the force on the test nail 11 exceeds the maximum pulling force, the corresponding pull rope 10 breaks at the equipment box.

[0054] It should be noted that the pull sensor 12 can be implemented in various ways. The simplest is a pull switch. Pulling the rope 10 causes the moving parts of the device to move, triggering a signal that changes the state, thereby achieving the effect of detection and feedback.

[0055] Several probes 11 of different lengths are fixed in the ground and connected to soil layers of different depths. For each probe 11, the sensor 12 is pulled to mark its burial depth.

[0056] The diagram shows four measuring pins 11 arranged at equal central angles. These measuring pins 11 come in two sizes: the shortest, located at the front, is typically buried at a depth of about 1 meter; the pins on the right rear are buried at a deeper depth, generally about 5 meters. In practical use, measuring pins 11 with different burial depths can be set as needed. Different burial depths correspond to different surface soil displacements. For example, when a certain amount of landslide occurs, the surface soil at a depth of no more than 1 meter will experience significant displacement. At this time, the measuring pins 11, inserted at a depth of about 1 meter, will move with the soil and provide corresponding feedback through the pull sensor 12.

[0057] Furthermore, rollers can be installed inside the device box, and the pull rope 10 can be wound around different rollers. The change in length is monitored by the angular velocity sensor, thereby further improving its feedback effect.

[0058] Furthermore, a protective net is provided on the upright 2. The protective net is installed on the mounting part of the concrete block 1 and is fixedly connected to the embedded horizontal steel mesh.

[0059] In some embodiments, deep fixed monitoring can also be performed using... Figures 1-5 The concrete block 1 and the steel mesh frame are set up in a way that is different from the previous method. Figures 1-5 Instead of using a single, integrated concrete block 1, a distributed structure is adopted. This means that independent concrete blocks 1 are set for both the main steel reinforcement mesh 7 and the secondary steel reinforcement mesh 8. Each concrete block 1 has a large horizontal extension area but a small thickness. The horizontal reinforcement provides high structural strength, while the relatively small thickness allows for some possibility of sliding. This split-block structure design allows for localized sliding displacement due to different soil conditions. The support rod 6 is replaced by a rope 10, and the corresponding length detection method also achieves the effect of localized sliding positioning.

[0060] This invention is not limited to the optional embodiments described above, and anyone can derive other various forms of products based on the inspiration of this invention. The specific embodiments described above should not be construed as limiting the scope of protection of this invention; the scope of protection of this invention should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A GNSS-based surface displacement monitoring device, comprising a reference station and a measuring station, wherein the measuring station and the reference station are set on the ground in the monitoring area for data exchange, and perform real-time position correction by comparing with satellite positioning coordinates, characterized in that: The poles serve as reference stations and measuring stations. The ground in the monitoring area where the poles are located has buried concrete blocks (1), and the poles are fixedly connected to the concrete blocks (1). The pole includes a pole (2) and an antenna (3), a solar panel (4) and a control box (5) installed at the top of the pole (2). The control box (5) contains a solar cell connected to the solar panel (4). Among them, the concrete block (1) includes two types: surface sliding type and deep fixed type. The surface sliding type concrete block (1) has a horizontal reinforcing structure, and the maximum thickness and burial depth of the surface sliding type concrete block (1) are both less than five meters. The deep fixed type concrete block (1) has a vertical reinforcing structure, and its insertion depth into the ground is not less than fifteen meters. In the surface sliding concrete block (1), the reinforcing structure includes a main steel mesh (7) and several secondary steel meshes (8). The upright (2) has an end that is inserted into the main steel mesh (7) and is fixedly connected to the end by a reinforcing bar (9) located in the middle of the main steel mesh (7) during installation. The deep-fixed concrete block (1) is an anti-slip pile with a burial depth of not less than 15 meters. The anti-slip pile has several vertical steel bars extending along its length direction. At the top of the anti-slip pile is an installation part. Inside the installation part is a horizontal steel mesh connecting the tops of all the vertical steel bars. The upright (2) is fixed inside the horizontal steel mesh.

2. The surface displacement monitoring device based on GNSS according to claim 1, characterized in that: The main steel reinforcement mesh (7) and the secondary steel reinforcement mesh (8) are both hollow woven tube structures. The thickness of the secondary steel reinforcement mesh (8) is less than that of the main steel reinforcement mesh (7). The secondary steel reinforcement mesh (8) is set on both sides of the main steel reinforcement mesh (7) and is equidistantly spaced in a parallel manner on the top surface.

3. The surface displacement monitoring device based on GNSS according to claim 2, characterized in that: The main steel reinforcement mesh (7) and the secondary steel reinforcement mesh (8) have a number of main reinforcement bars arranged along the length direction, and a clamp sleeved on the outside of the column formed by the main reinforcement bars and welded to all the main reinforcement bars. The reinforcing bars are connected to the main reinforcement bars and the clamps at the same time.

4. The surface displacement monitoring device based on GNSS according to claim 3, characterized in that: The secondary steel reinforcement mesh (8) is provided with a support rod (6). One end of the support rod (6) is inserted into the secondary steel reinforcement mesh (8) and connected to the clamp, and the other end extends out of the secondary steel reinforcement mesh (8) and the concrete block (1) and its end is connected to the upright (2). Each secondary steel reinforcement mesh (8) is provided with at least two support rods (6), and all support rods (6) are arranged in a ring around the upright (2) and have the same end connected to the same position of the upright (2).

5. A surface displacement monitoring device based on GNSS according to claim 4, characterized in that: The main steel reinforcement mesh (7) is located in a cavity within the concrete block (1), and the top of the cavity has a pressure cap fixed by bolts; The pole (2) is a hollow structure. The cavity of the concrete block (1) is equipped with a storage device for connecting the control box (5). The storage device records all process data of the control box (5).

6. The surface displacement monitoring device based on GNSS according to claim 1, characterized in that: The upright (2) is provided with an equipment box, which has several openings. Each opening is provided with a pull sensor (12). One end of the pull sensor (12) is connected to a pull rope (10). The pull rope (10) passes through the equipment box and extends to the ground outside, connecting with a test nail (11) set on the ground. When the test nail (11) is fixed on the ground, the corresponding pull rope (10) is in a taut state. The pull sensor (12) provides data feedback based on the pulling force of the pull rope (10). The pull rope (10) has a maximum pulling force. When the force on the test nail (11) is greater than the maximum pulling force, the corresponding pull rope (10) is disconnected at the equipment box.

7. A surface displacement monitoring device based on GNSS according to claim 6, characterized in that: The probes (11) are of different lengths and are fixed in the ground and connected to soil layers of different depths. For each probe (11), the sensor (12) is pulled to mark its burial depth.

8. A surface displacement monitoring device based on GNSS according to claim 6, characterized in that: The pole (2) is provided with a protective net, which is installed on the concrete block (1) and fixedly connected to the embedded horizontal steel mesh.

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