Direct monitoring method for settlement of existing pipeline deeply buried underground

Abstract

The invention discloses a direct monitoring method for settlement of an existing pipeline deeply buried underground. A soil body is cut to form a hole in a mode of combining a plastic flexible drill bit and hydraulic scouring, the hole forming speed is reasonably controlled and adjusted, and damage to other pipelines possibly existing on the upper portion of a measured pipeline and the measured pipeline is avoided. A measuring hole is formed above the existing pipeline in operation through a composite cutting hole forming method, wall protection and hole cleaning technologies are combined, a protective pipe is installed, a measuring rod for fixedly connecting the measured pipeline with a ground measuring point is installed, and direct measurement of settlement change of the existing pipeline deeply buried underground is achieved by measuring elevation change of the top end of the measuring rod. The GNSS receiver is arranged at the top end of the measuring rod, and the high-precision real-time online direct monitoring of the settlement change of the existing pipeline deeply buried underground is realized by monitoring the elevation change of the top end of the measuring rod in combination with a GNSS Beidou high-precision positioning technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of settlement monitoring, in particular to a direct monitoring method for the settlement of deep-buried existing pipelines. BACKGROUND

[0002] Underground pipelines are important urban infrastructure, and during the construction of underground projects, they often have a significant impact on surrounding pipelines. Once the pipelines are damaged due to deformation, serious consequences will occur. In order to ensure the safe operation of underground pipelines and the safety of the construction process, deformation monitoring of existing pipelines near the construction area must be carried out during the construction process, and pipeline settlement monitoring is one of the important monitoring contents. Through monitoring data, the construction process can be effectively guided, and construction process parameters can be optimized and adjusted to ensure the safety of the construction process and the safe and normal operation of surrounding pipelines, avoiding accidents. During the operation of the pipeline, online settlement monitoring can effectively monitor the adverse effects of uneven settlement on the pipeline, and timely detection of safety hazards can enable effective countermeasures to be taken to ensure the safe operation of the pipeline.

[0003] Currently, there are two ways to monitor the settlement of underground pipelines: direct monitoring points and indirect monitoring points. Direct monitoring points are usually connected to the pipeline directly after excavation using a clamp or similar method, but these monitoring methods are difficult and costly to implement for deep-buried underground existing pipelines. Therefore, the common method for monitoring the settlement of deep-buried underground existing pipelines is indirect monitoring, which involves drilling a hole above or to the side of the pipeline and burying a steel bar as a pipeline monitoring point. Since the indirect monitoring point is not directly connected to the pipeline, the settlement of the two points cannot be completely synchronized, resulting in monitoring data that cannot accurately reflect the settlement state of the pipeline, and the monitoring data obtained often has large errors, which can easily mislead the actual application of the monitoring data. SUMMARY

[0004] The present application aims to provide a direct monitoring method for the settlement of deep-buried underground existing pipelines to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a direct monitoring method for the settlement of deep-buried underground existing pipelines, mainly for underground pipelines made of ferromagnetic materials such as steel pipes and cast iron pipes. The specific monitoring method includes the following steps: A. According to the pipeline data and monitoring requirements, use measuring instruments to determine the accurate position of the measurement hole and mark it; B. The measurement hole is constructed by cutting the soil into a hole using a plastic flexible drill bit and water jet scouring, with a drill bit speed of 50-300 rpm and a water pressure of 0.5-2.5 MPa; C, drill depth to reach the top of the pipe elevation above the underground pipeline 1-2 meters, reduce the drill speed to 50-150 rpm, increase the water pressure to 1.5-2.5 MPa, mainly by hydraulic flushing, mechanical cutting auxiliary, until the drill reaches the outer wall of the underground pipeline pipe, the measurement hole construction is completed; D, lift the drill and drill pipe, install the measurement hole protection pipe, and then lower the drill pipe again after removing the drill; E, connect the measurement rod base to the first section of the settlement measurement rod through the universal joint connector, and put it into the measurement hole. During the lowering of the settlement measurement rod, connect the subsequent rod sections one by one until the settlement measurement rod reaches the bottom of the measurement hole and the outer wall of the underground pipeline pipe. Clean the hole bottom sediment by hydraulic flushing, and try to firmly adsorb the measurement rod base on the wall of the underground pipeline at the same time; F, check the pullout resistance between the settlement measurement rod and the underground pipeline, which should be not less than 400 N. If the requirement is met, the settlement measurement rod installation is completed, and the drill pipe is lifted; G, install the measurement rod protection pipe outside the settlement measurement rod; H, backfill fine sand between the measurement rod protection pipe and the measurement hole protection pipe; I, set a limiting device on the top of the settlement measurement rod to limit the movement range of the settlement measurement rod in the horizontal two-dimensional direction, and the settlement measurement rod still keeps free movement in the vertical direction; J, install a GNSS receiver at the top end of the settlement measurement rod, install data transmission equipment, power supply equipment and other station equipment nearby. The station GNSS receiver receives Beidou monitoring information in real time at the monitoring point, transmits the Beidou monitoring information to the solution cloud platform through the data communication module, selects a reference point in a stable foundation and open environment near the monitoring point, installs a set of GNSS base station equipment, and the base station GNSS receiver receives Beidou reference information in real time at the reference point. The solution cloud platform calculates the three-dimensional coordinates of the monitoring point according to the Beidou monitoring information and the Beidou reference information received within the solution period, directly measures the settlement change of the underground pipeline through the settlement measurement rod, and combines with the GNSS Beidou high-precision positioning technology to realize high-precision real-time online monitoring of the settlement of the underground pipeline.

[0006] A direct monitoring method for deep-buried existing pipeline settlement, mainly for underground pipelines without ferromagnetic materials, the specific monitoring method includes the following steps: A, according to the pipeline data and monitoring requirements, use the measuring instrument to determine the accurate position of the measurement hole, and mark it; B, the measurement hole construction adopts the combination of plastic flexible drill bit and hydraulic flushing to cut the soil into a hole, the drill bit speed is 50-300 rpm, and the water pressure is 0.5-2.5 MPa; C, drill depth to reach the top of the pipe elevation of the underground pipeline 1-2 meters, reduce the drill bit speed to 50-150 rpm, improve the water pressure to 1.5-2.5 MPa, mainly by hydraulic flushing, mechanical cutting auxiliary, until the drill reaches the outer wall of the underground pipeline pipe, the measurement hole construction is completed; D, lift the drill bit and drill pipe, install the measurement hole protection pipe, and then lower the drill pipe again after removing the drill bit; E, improve the water pressure to 1.5-2.5 MPa, clean the sediment at the bottom of the hole and the outer wall of the underground pipeline by hydraulic flushing, and lift the drill pipe after the hole is cleaned to meet the conditions; F, the bottom of the inner cylinder of the measuring rod is closed at the bottom and hollow at the top, the bottom of the outer cylinder of the measuring rod is hollow at the bottom and open at the top, the outer diameter of the inner cylinder of the measuring rod is slightly smaller than the inner diameter of the outer cylinder of the measuring rod, and the inner cylinder and the outer cylinder form a sleeve structure, and a limiting device is arranged, after assembly, the limiting position of the downward movement of the inner cylinder of the measuring rod is limited to the maximum downward movement of the bottom surface of the inner cylinder of the measuring rod, and the limiting position of the upward movement of the inner cylinder of the measuring rod is adjusted according to the required amount of underwater structural adhesive filled between the bottom surface of the inner cylinder of the measuring rod and the bottom surface of the outer cylinder of the measuring rod; G, connect the measuring rod base to the first section of the settlement measuring rod through the universal joint connector, and fix the measuring rod base to the inner bottom surface of the inner cylinder of the measuring rod, then put the inner cylinder of the measuring rod into the outer cylinder of the measuring rod, and adjust the limiting device to fill the underwater structural adhesive in the space between the bottom surface of the inner cylinder of the measuring rod and the bottom surface of the outer cylinder of the measuring rod; H, put the settlement measuring rod into the measurement hole, and connect the subsequent rod sections during the downward movement of the settlement measuring rod, until the bottom surface of the outer cylinder of the measuring rod reaches the outer wall of the underground pipeline pipe at the bottom of the measurement hole; I, appropriately lift the measurement hole protection pipe to make it 20-30 cm away from the bottom of the measurement hole, slowly press down the settlement measuring rod, so that the inner cylinder of the measuring rod continues to move downward, until the bottom surface of the inner cylinder of the measuring rod also approaches the outer wall of the underground pipeline pipe, and the pre-filled underwater structural adhesive adheres the outer wall of the underground pipeline pipe to the inner cylinder of the measuring rod and the outer cylinder of the measuring rod; J, during the curing process of the underwater structural adhesive, configure a weight at the top of the settlement measuring rod to maintain the stability of the settlement measuring rod while continuously maintaining a proper downward pressure; K, after the underwater structural adhesive is cured, check the pullout resistance between the settlement measuring rod and the underground pipeline, which should be not less than 400 N, and the installation of the settlement measuring rod is completed after meeting the requirements; L, lower the measurement hole protection pipe to the bottom of the measurement hole, and install the measuring rod protection pipe outside the settlement measuring rod; M, backfill fine sand between the measuring rod protection pipe and the measurement hole protection pipe; N, limit the movement range of the settlement measuring rod in the horizontal two-dimensional direction by setting a limiting device at the top of the settlement measuring rod, and the settlement measuring rod still keeps free movement in the vertical direction; O, install a GNSS receiver at the top end of the settlement measuring rod, install a data transmission device, a power supply device and other station devices nearby, the station GNSS receiver receives Beidou monitoring information in real time at the monitoring point, transmits the Beidou monitoring information to the solving cloud platform through the data communication module, selects a reference point in a place with stable ground and open surroundings near the monitoring point, and installs a set of GNSS base station equipment, the base station GNSS receiver receives Beidou reference information in real time at the reference point, transmits the Beidou reference information to the solving cloud platform through the data communication module, and the solving cloud platform solves the three-dimensional coordinates of the monitoring point according to the Beidou monitoring information and the Beidou reference information received in the solving period, directly measures the settlement change of the underground pipeline through the settlement measuring rod, and combines the GNSS Beidou high-precision positioning technology, so that high-precision real-time online monitoring of the settlement of the underground pipeline is realized.

[0007] Compared with the prior art, the beneficial effects of the present application are: The present application provides a direct monitoring method which meets the requirements of high-precision real-time online monitoring of deep-buried existing pipeline settlement and is economical and applicable. By establishing a contact measuring rod between the deep-buried existing pipeline and the ground position, the direct contact between the vertical settlement of the deep-buried underground pipeline in operation and the ground measuring point is realized, and the direct measurement of the settlement of the deep-buried existing pipeline is realized. Combined with the GNSS Beidou positioning technology, high-precision real-time online monitoring of the pipeline settlement is realized, the whole process continuous monitoring during the influence period of the existing pipeline construction in the underground engineering construction process can be realized, and the safety and normal operation of the surrounding pipeline during the underground engineering construction process are ensured. The present application can also be used for real-time online settlement monitoring of the existing pipeline in operation. Through high-precision real-time online monitoring of the pipeline settlement, the adverse effects of uneven settlement on the pipeline are continuously and effectively observed, safety hazards are found in time so that effective measures can be taken, and the safety of the pipeline operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is a first structure schematic view of the embodiment of the present application; Figure 2 It is a first structure schematic view of the embodiment of the present application; Figure 3 It is a second structure schematic view of the embodiment of the present application; Figure 4 It is a second structure schematic view of the embodiment of the present application.

[0009] In the figure: 1, settlement measuring rod; 2, measuring rod protection tube; 3, measuring hole protection wall tube; 4, measuring rod base; 5, universal joint connecting piece; 6, GNSS receiver; 7, underground pipeline; 8, measuring rod bottom inner cylinder; 9, measuring rod bottom outer cylinder; 10, underwater structural adhesive. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0011] Embodiment 1 is mainly aimed at the underground pipelines with ferromagnetic materials such as steel pipes and cast iron pipes.

[0012] In the embodiment, the underground pipeline 7 is buried below the ground, the strong magnet block is installed in the inside of the measuring rod base 4, the settlement measuring rod 1 is firmly adsorbed on the outer wall of the underground pipeline 7 through the measuring rod base 4, and direct and close connection with the underground pipeline 7 is realized, so that the settlement change information of the settlement measuring rod 1 can accurately and intuitively reflect the settlement change information of the underground pipeline 7, and then through measuring the elevation change of the top end of the settlement measuring rod 1, direct measurement of the settlement change of the underground pipeline 7 can be realized. The settlement measuring rod 1 is preferably made of a material with small thermal expansion coefficient, so as to reduce the influence of the deformation of the settlement measuring rod 1 itself caused by temperature change.

[0013] In the specific implementation of the embodiment, according to the pipeline data and monitoring requirements, the accurate position of the measuring hole is determined by using measuring instruments, and marking is well done.

[0014] The measuring hole construction adopts the mode of cutting soil into a hole by combining a plastic flexible drill bit with hydraulic flushing, the rotation speed of the drill bit is 50-300 rpm, and the water pressure is 0.5-2.5 MPa. The plastic flexible drill bit is made of high-strength engineering plastic, the front end of the drill bit is designed as a sawtooth or spiral structure, and has flexibility and wear resistance. The hydraulic system is equipped with a high-pressure water pump, a water delivery pipeline and a nozzle, the nozzle is embedded in the side or front end of the drill bit, and is used for directional flushing of soil.

[0015] During the construction of the measuring hole, the drilling is carried out by hydraulic flushing in cooperation with the plastic flexible drill bit. The change of the soil layer is determined according to the size and color of the returned slag, and the construction process parameters are dynamically adjusted according to the change of the soil layer. In the soft soil layer, the water pressure is appropriately increased to 1.5-2.5 MPa, the flushing range is expanded, and the resistance of the drill bit is reduced. In the hard or cohesive soil layer, the water pressure is reduced to 0.5-1.5 MPa, and the rotation speed of the drill bit is appropriately increased to 150-300 rpm, so that the mechanical cutting is mainly used and the hydraulic flushing is assisted. In the loose sand layer, bentonite slurry is added to the circulating water to stabilize the hole wall. After drilling 1-2 meters, the drilling is stopped, the drill bit is checked for wear, the nozzle blockage is cleaned, and the current hole depth and verticality of the measuring hole are checked.

[0016] When the drilling depth reaches 1-2 meters above the top elevation of the underground pipeline 7, the rotation speed of the drill bit is reduced to 50-150 rpm, and the water pressure is increased to 1.5-2.5 MPa, so that the hydraulic flushing is mainly used and the mechanical cutting is assisted, until the drilling reaches the outer wall of the pipeline of the underground pipeline 7, and the construction of the measuring hole is completed.

[0017] The drill bit and drill rod are lifted, the measuring hole protection pipe 3 is installed, and the drill bit is removed again before the drill rod is lowered again.

[0018] The measuring rod base 4 is connected to the first section of the settlement measuring rod 1 through the universal joint connector 5, and is lowered into the measuring hole. During the lowering of the settlement measuring rod 1, the subsequent rod sections are connected in sections until the settlement measuring rod 1 reaches the outer wall of the pipeline of the underground pipeline 7 at the bottom of the measuring hole. The hole bottom sediment is cleaned by hydraulic flushing, and the hole is cleaned while trying to firmly adsorb the measuring rod base 4 on the wall of the underground pipeline 7.

[0019] The pullout resistance between the settlement measuring rod 1 and the underground pipeline 7 is checked, which should be not less than 400 N, and the settlement measuring rod 1 is installed after meeting the requirements. The drill rod is lifted.

[0020] The measuring rod protection pipe 2 is installed outside the settlement measuring rod 1.

[0021] Fine sand is backfilled between the measuring rod protection pipe 2 and the measuring hole protection pipe 3.

[0022] A limiting device is arranged at the top of the settlement measuring rod 1 to limit the movement range of the settlement measuring rod 1 in the horizontal two-dimensional direction, and the settlement measuring rod 1 still has free movement in the vertical direction.

[0023] A GNSS receiver 6 is installed at the top end of the settlement measuring rod 1, and other station equipment such as data transmission equipment and power supply equipment is installed nearby.

[0024] In the monitoring, the GNSS receiver 6 of the station receives the Beidou monitoring information in real time at the monitoring point, and transmits the Beidou monitoring information to the solving cloud platform through the data communication module. A reference point is selected near the monitoring point, and a GNSS base station equipment is installed. The GNSS receiver of the base station receives the Beidou reference information in real time at the reference point, and transmits the Beidou reference information to the solving cloud platform through the data communication module. The solving cloud platform solves the three-dimensional coordinates of the monitoring point according to the Beidou monitoring information and the Beidou reference information received in the solving period. The settlement of the underground pipeline 7 is directly measured by the settlement measuring rod 1, and the GNSS Beidou high-precision positioning technology is combined, so that the high-precision real-time online monitoring of the settlement of the underground pipeline 7 is realized.

[0025] The embodiment 2 is mainly aimed at the underground pipeline without ferromagnetic material.

[0026] In the embodiment, the underground pipeline 7 is buried underground, the settlement measuring rod 1 is fixed on the inner bottom surface of the inner cylinder 8 at the bottom of the measuring rod through the measuring rod base 4, and the inner cylinder 8 at the bottom of the measuring rod and the outer cylinder 9 at the bottom of the measuring rod are firmly bonded on the outer wall of the underground pipeline 7 through the underwater structural adhesive 10, so as to realize the direct and close connection with the underground pipeline 7. Therefore, the settlement change information of the settlement measuring rod 1 can accurately and directly reflect the settlement change information of the underground pipeline 7, and the elevation change of the top end of the settlement measuring rod 1 can be measured, so as to realize the direct measurement of the settlement change of the underground pipeline 7. The settlement measuring rod 1 is preferably made of a material with small thermal expansion coefficient, so as to reduce the influence of the deformation of the settlement measuring rod 1 itself caused by the temperature change.

[0027] The construction part of the measuring hole in the embodiment is basically the same as that in the embodiment 1, and will not be described herein.

[0028] After the construction of the measuring hole is completed, the drill bit and the drill rod are lifted, the measuring hole protection pipe 3 is installed, and the drill bit is removed again before the drill rod is lowered again.

[0029] The water pressure is increased to 1.5-2.5 MPa, the hole bottom sediment and the outer wall of the underground pipeline 7 are cleaned by hydraulic flushing, and the drill rod is lifted after the hole cleaning meets the conditions.

[0030] The bottom surface of the inner cylinder 8 at the bottom of the measuring rod is closed, and the top surface is hollow. The bottom surface of the outer cylinder 9 at the bottom of the measuring rod is hollow, and the top surface is opened. The outer diameter of the inner cylinder 8 at the bottom of the measuring rod is slightly smaller than the inner diameter of the outer cylinder 9 at the bottom of the measuring rod. The inner cylinder 8 at the bottom of the measuring rod and the outer cylinder 9 at the bottom of the measuring rod form a sleeve structure, and a limiting device is arranged. After assembly is completed, the limiting position of the downward movement of the inner cylinder 8 at the bottom of the measuring rod limits the maximum downward movement of the bottom surface of the inner cylinder 8 at the bottom of the measuring rod to be flush with the bottom surface of the outer cylinder 9 at the bottom of the measuring rod, and the limiting position of the upward movement of the inner cylinder 8 at the bottom of the measuring rod is adjusted according to the required amount of underwater structural adhesive 10 filled between the bottom surface of the inner cylinder 8 at the bottom of the measuring rod and the bottom surface of the outer cylinder 9 at the bottom of the measuring rod.

[0031] The measuring rod base 4 is connected with the first section of the settlement measuring rod 1 through the universal joint connector 5. The measuring rod base 4 is fixedly connected with the inner bottom surface of the measuring rod bottom inner cylinder 8 by extending into the inside of the measuring rod bottom inner cylinder 8. The measuring rod bottom inner cylinder 8 is sleeved into the measuring rod bottom outer cylinder 9. After adjusting the limiting device, the part space between the bottom surface of the measuring rod bottom inner cylinder 8 and the bottom surface of the measuring rod bottom outer cylinder 9 is filled with underwater structural adhesive 10.

[0032] The settlement measuring rod 1 is placed downward into the measuring hole. During the downward placement of the settlement measuring rod 1, the subsequent rod sections are connected in sequence until the bottom surface of the measuring rod bottom outer cylinder 9 reaches the outer wall of the pipeline of the underground pipeline 7 at the bottom of the measuring hole.

[0033] The measuring hole protection pipe 3 is appropriately lifted to be away from the bottom of the measuring hole by 20-30 cm, and the settlement measuring rod 1 is slowly pressed downward, so that the measuring rod bottom inner cylinder 8 continues to move downward until the bottom surface of the measuring rod bottom inner cylinder 8 also approaches the outer wall of the pipeline of the underground pipeline 7. The pre-filled underwater structural adhesive 10 bonds the outer wall of the pipeline of the underground pipeline 7 with the measuring rod bottom inner cylinder 8 and the measuring rod bottom outer cylinder 9. Figures 3-4 The settlement measuring rod 1 is placed downward into the measuring hole. During the downward placement of the settlement measuring rod 1, the subsequent rod sections are connected in sequence until the bottom surface of the measuring rod bottom outer cylinder 9 reaches the outer wall of the pipeline of the underground pipeline 7 at the bottom of the measuring hole.

[0034] During the curing process of the underwater structural adhesive 10, the top of the settlement measuring rod 1 is configured with a weight to keep the settlement measuring rod 1 stable while continuously maintaining a proper downward pressure.

[0035] After the curing of the underwater structural adhesive 10 is completed, the uplift resistance between the settlement measuring rod 1 and the underground pipeline 7 is checked, and the uplift resistance should be not less than 400 N, and after meeting the requirements, the installation of the settlement measuring rod 1 is completed.

[0036] The measuring hole protection pipe 3 is placed to the bottom of the measuring hole, and the measuring rod protection pipe 2 is installed outside the settlement measuring rod 1.

[0037] The subsequent construction process of the embodiment is basically the same as that of Embodiment 1, and will not be described again.

[0038] The settlement of the underground pipeline 7 is directly measured by the settlement measuring rod 1, and the GNSS Beidou high-precision positioning technology is combined, so that the high-precision real-time online monitoring of the settlement of the underground pipeline 7 is realized.

[0039] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for direct monitoring of settlement of deep-buried existing pipelines, characterized in that: The specific monitoring method mainly for the underground pipeline with ferromagnetic material such as steel pipe and cast iron pipe comprises the following steps: A. According to the pipeline data and monitoring requirements, use measuring instruments to determine the accurate position of the measuring hole, and make a good mark; B. The measuring hole construction adopts the way of cutting the soil into a hole by combining the plastic flexible drill bit with hydraulic flushing, the drill bit speed is 50-300 rpm, and the water pressure is 0.5-2.5 MPa; C. The drilling depth reaches 1-2 meters above the pipe top elevation of the underground pipeline (7), the drill bit speed is reduced to 50-150 rpm, the water pressure is increased to 1.5-2.5 MPa, the hydraulic flushing is mainly used, and the mechanical cutting is assisted until the drilling reaches the outer wall of the pipeline of the underground pipeline (7), and the measuring hole construction is completed; D. The drill bit and drill rod are lifted, the measuring hole protection pipe (3) is installed, and then the drill rod is lowered again after the drill bit is removed; E. The measuring rod base (4) is connected with the first section of the settlement measuring rod (1) through the universal joint connector (5), and is put into the measuring hole, during the downward placing of the settlement measuring rod (1), the subsequent rod sections are connected in sections until the settlement measuring rod (1) reaches the outer wall of the pipeline of the underground pipeline (7) at the bottom of the measuring hole, the hole bottom sediment is cleaned through hydraulic flushing, the hole is cleaned, and the measuring rod base (4) is tried to be firmly adsorbed on the wall of the underground pipeline (7); F. The anti-pulling force between the settlement measuring rod (1) and the underground pipeline (7) is checked, the anti-pulling force should be not less than 400 N, the settlement measuring rod (1) is installed after meeting the requirements, and the drill rod is lifted; G. The measuring rod protection pipe (2) is installed outside the settlement measuring rod (1); H. Fine sand is backfilled between the measuring rod protection pipe (2) and the measuring hole protection pipe (3); I. The limiting device is arranged at the top of the settlement measuring rod (1) to limit the movement range of the settlement measuring rod (1) in two horizontal dimensions, and the settlement measuring rod (1) still keeps free movement in the vertical direction; J. The GNSS receiver (6) is installed at the top end of the settlement measuring rod (1), the data transmission equipment, power supply equipment and other station equipment are installed nearby, the station GNSS receiver (6) receives the Beidou monitoring information in real time at the monitoring point, the Beidou monitoring information is transmitted to the solving cloud platform through the data communication module, a reference point is arranged in a place with stable ground and open surrounding environment near the monitoring point, a set of GNSS base station equipment is installed, the base station GNSS receiver receives the Beidou reference information in real time at the reference point, the Beidou reference information is transmitted to the solving cloud platform through the data communication module, the three-dimensional coordinates of the monitoring point are solved according to the received Beidou monitoring information and Beidou reference information in the solving period, the settlement change of the underground pipeline (7) is directly measured through the settlement measuring rod (1), and the high-precision positioning technology of GNSS Beidou is combined, so that the high-precision real-time online monitoring of the settlement of the underground pipeline (7) is realized.

2. A method for direct monitoring of settlement of deep-buried existing pipelines, characterized in that: The specific monitoring method mainly for the underground pipeline without ferromagnetic material comprises the following steps: A. According to the pipeline data and monitoring requirements, use measuring instruments to determine the accurate position of the measuring hole, and make a good mark; B, the measuring hole is constructed by cutting the soil into a hole by using a plastic flexible drill bit and hydraulic flushing, the drill bit rotates at a speed of 50-300 rpm, and the water pressure is 0.5-2.5 MPa; C, the drill bit is lowered to a position 1-2 meters above the top of the underground pipeline (7), the rotation speed of the drill bit is reduced to 50-150 rpm, the water pressure is increased to 1.5-2.5 MPa, the hydraulic flushing is mainly used, and the mechanical cutting is assisted until the drill hole reaches the outer wall of the pipeline of the underground pipeline (7), and the construction of the measuring hole is completed; D, the drill bit and the drill rod are lifted, the measuring hole protection wall pipe (3) is installed, and the drill bit is removed again, and then the drill rod is lowered again; E, the water pressure is increased to 1.5-2.5 MPa, the silt at the bottom of the hole and the outer wall of the underground pipeline (7) are cleaned by hydraulic flushing, the drill rod is lifted after the hole is cleaned to meet the requirements; F, the bottom surface of the inner cylinder (8) at the bottom of the measuring rod is closed, the top surface is hollow, the bottom surface of the outer cylinder (9) at the bottom of the measuring rod is hollow, the top surface is open, the outer diameter of the inner cylinder (8) at the bottom of the measuring rod is slightly smaller than the inner diameter of the outer cylinder (9) at the bottom of the measuring rod, the inner cylinder (8) at the bottom of the measuring rod and the outer cylinder (9) at the bottom of the measuring rod form a sleeve structure, and a limiting device is arranged, after assembly, the limiting position of the downward movement of the inner cylinder (8) at the bottom of the measuring rod is limited to the maximum downward movement of the bottom surface of the inner cylinder (8) at the bottom of the measuring rod to be flush with the bottom surface of the outer cylinder (9) at the bottom of the measuring rod, and the limiting position of the upward movement of the inner cylinder (8) at the bottom of the measuring rod is adjusted according to the required amount of underwater structural adhesive (10) filled between the bottom surface of the inner cylinder (8) at the bottom of the measuring rod and the bottom surface of the outer cylinder (9) at the bottom of the measuring rod; G, the measuring rod base (4) is connected with the first section of the settlement measuring rod (1) through the universal joint connector (5), the measuring rod base (4) extends into the inside of the inner cylinder (8) at the bottom of the measuring rod and is fixedly connected with the inner bottom surface of the inner cylinder (8) at the bottom of the measuring rod, the inner cylinder (8) at the bottom of the measuring rod is sleeved into the outer cylinder (9) at the bottom of the measuring rod, and after the limiting device is adjusted, the underwater structural adhesive (10) is filled in the space between the bottom surface of the inner cylinder (8) at the bottom of the measuring rod and the bottom surface of the outer cylinder (9) at the bottom of the measuring rod; H, the settlement measuring rod (1) is lowered into the measuring hole, during the lowering process of the settlement measuring rod (1), the subsequent rod sections are connected in sequence until the bottom surface of the outer cylinder (9) at the bottom of the measuring rod reaches the outer wall of the pipeline of the underground pipeline (7) at the bottom of the measuring hole; I, the measuring hole protection wall pipe (3) is appropriately lifted to be away from the bottom of the measuring hole by 20-30 cm, the settlement measuring rod (1) is slowly pressed down, the inner cylinder (8) at the bottom of the measuring rod continues to move downward, until the bottom surface of the inner cylinder (8) at the bottom of the measuring rod also approaches the outer wall of the pipeline of the underground pipeline (7), and the pre-filled underwater structural adhesive (10) bonds the outer wall of the pipeline of the underground pipeline (7) with the inner cylinder (8) at the bottom of the measuring rod and the outer cylinder (9) at the bottom of the measuring rod; J, during the curing process of the underwater structural adhesive (10), a weight is arranged at the top of the settlement measuring rod (1), the settlement measuring rod (1) is kept stable while the appropriate downward pressure is continuously maintained; K, after the underwater structural adhesive (10) is cured, the pullout resistance between the settlement measuring rod (1) and the underground pipeline (7) is checked, the pullout resistance should be not less than 400 N, and the settlement measuring rod (1) is installed after the pullout resistance meets the requirements; L, the measured hole wall pipe (3) is lowered to the bottom of the measured hole, and the settlement measuring rod (1) is installed with the measuring rod protection pipe (2); M, fine sand is backfilled between the measuring rod protection pipe (2) and the measured hole wall pipe (3); N, a limiting device is arranged at the top of the settlement measuring rod (1) to limit the movement range of the settlement measuring rod (1) in two horizontal dimensions, and the settlement measuring rod (1) still keeps free movement in the vertical direction; O, a GNSS receiver (6) is installed at the top end of the settlement measuring rod (1), and a data transmission device, a power supply device and other station equipment are installed nearby; the station GNSS receiver (6) receives Beidou monitoring information at the monitoring point in real time, transmits the Beidou monitoring information to the solving cloud platform through a data communication module, selects a reference point in a place with stable ground and an open surrounding environment near the monitoring point, installs a set of GNSS base station equipment, the base station GNSS receiver receives Beidou reference information at the reference point in real time, transmits the Beidou reference information to the solving cloud platform through a data communication module, and the solving cloud platform solves the three-dimensional coordinates of the monitoring point according to the Beidou monitoring information and the Beidou reference information received in the solving period, directly measures the settlement change of the underground pipeline (7) through the settlement measuring rod (1), and combines the GNSS Beidou high-precision positioning technology, so as to realize high-precision real-time online monitoring of the settlement of the underground pipeline (7).

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