A ductile cast iron jacking pipe for a non-excavation pipe construction

Abstract

The application relates to the field of marine pipeline engineering, in particular to a nodular cast iron pipe jacking for internal action type whole non-excavation pipeline construction, which comprises a nodular cast iron pipe jacking, further comprises a control end, the two sides of the nodular cast iron pipe jacking are integrally formed with a receiving port and a plug-in end, the inner wall of the receiving port is provided with a first pressure sensing end and a second pressure sensing end, the top of the nodular cast iron pipe jacking, a sliding material discharge port is arranged on the surface of the nodular cast iron pipe jacking, a metal mounting strip is embeddedly arranged on the outer surface of the nodular cast iron pipe jacking, and the two ends of the surface of the metal mounting strip are provided with a third pressure sensing end and a fourth pressure sensing end. The application can monitor the pressure change of the outer wall of the pipeline and the seepage state of the sliding material in real time, dynamically control the injection amount of the sliding material to adapt to the seawater pressure fluctuation and the seabed geological change, and can calculate the pipeline breaking risk through multi-dimensional stress analysis, accurately set the construction intermediate layer, and solve the problem of continuous pipeline laying in the deep sea environment.

Description

Technical Field

[0001] This invention relates to the field of marine pipeline engineering, specifically to a ductile iron jacking pipe for internal action integral trenchless pipeline construction. Background Technology

[0002] Marine pipeline engineering primarily involves laying subsea pipelines. Compared to land-based construction, the marine environment presents challenges such as high-pressure seawater corrosion, ocean current impact, and complex seabed geology. Traditional marine pipelines require segmented laying and frequent installation of intermediate support layers, leading to three major problems:

[0003] Poor continuity: In the high-pressure environment of the deep sea, the axial thrust of the pipeline increases exponentially with the length. To avoid the risk of pipe rupture, the existing technology conservatively sets the laying distance of each section to no more than 30 meters (originally 40 meters, modified to marine scenario value). Frequent start-up and shutdown of construction significantly increases costs.

[0004] Failure of lubricant quantity control: It is difficult to form a stable mud sleeve in dynamic seawater with a single lubricant discharge outlet. Continuous excessive injection leads to material waste, while insufficient injection exacerbates the friction between the pipe wall and the seabed.

[0005] Corrosion risk: Conventional sensors are prone to failure in salt-corrosion environments and cannot monitor the stress state of pipelines in real time.

[0006] Therefore, there is an urgent need for an intelligent ductile iron jacking pipe adapted to the marine environment. Summary of the Invention

[0007] To address the main problems of traditional ductile iron jacking pipes, namely the inability to continuously install them and the inability to control the amount of sliding material used, this invention uses multiple sensors to collect and analyze data during the installation process of ductile iron jacking pipes in real time.

[0008] The technical solution adopted in this invention is: a ductile iron jacking pipe for internal action integral trenchless pipeline construction, including a ductile iron jacking pipe and a control end. The two sides of the ductile iron jacking pipe are integrally formed with a socket and a plug end. The inner wall of the socket is provided with a first pressure sensing end and a second pressure sensing end. The top of the ductile iron jacking pipe and the surface of the ductile iron jacking pipe are provided with a sliding material outlet. The outer surface of the ductile iron jacking pipe is inlaid with a metal mounting strip. The two ends of the surface of the metal mounting strip are provided with a third pressure sensing end and a fourth pressure sensing end.

[0009] The socket and the plug end are adapted to each other. The first pressure sensing end and the second pressure sensing end are set at the two ends of the cross-sectional diameter of the socket. The metal mounting strip is completely embedded in the surface of the ductile iron jacking pipe. The metal mounting strip, the third pressure sensing end and the fourth pressure sensing end are horizontal with the surface of the ductile iron jacking pipe.

[0010] Preferably, the first pressure sensing end and the second pressure sensing end are used to collect the pressure values ​​generated by the connector 3 and the bearing interface, and are recorded as p1 and p2 respectively.

[0011] Preferably, the pressure values ​​on the outer wall of the ductile iron jacking pipe 1 collected by the third and fourth pressure sensing ends are denoted as p3 and P4, respectively.

[0012] Preferably, the control terminal includes a data acquisition terminal and a processing terminal. The data acquisition terminal includes a pressure acquisition unit, a time acquisition unit, and a speed acquisition unit. The pressure acquisition unit includes a first pressure sensing terminal, a second pressure sensing terminal, a third pressure sensing terminal, and a fourth pressure sensing terminal. The time acquisition unit is used to acquire the displacement time of the ductile iron jacking pipe and the time of the lubricating material spraying at the lubricating material outlet. The speed acquisition unit acquires the spraying speed of the lubricating material at the lubricating material outlet and the moving speed of the ductile iron jacking pipe.

[0013] Preferably, the processing end is used to calculate the breakage risk coefficient of a single ductile iron jacking pipe.

[0014] Preferably, the calculation process for the breakage risk factor of the ductile iron jacking pipe is as follows: the breakage risk factor of the ductile iron jacking pipe is determined by the ratio of the maximum working stress to the material strength, where the material strength is an existing parameter, and the maximum working stress is determined by any maximum value of the axial, radial, and circumferential stresses of the ductile iron jacking pipe. The axial stress of the ductile iron jacking pipe is: Where A is the cross-section of the ductile iron jacking pipe 1, and the circumferential stress of the ductile iron jacking pipe is: Where S is the surface area of ​​1, T is the average thickness of the ductile iron jacking pipe, and the radial stress of the ductile iron jacking pipe is the average of p1 and p2.

[0015] Preferably, the processing terminal calculates the breakage risk coefficient and outputs it to the control terminal. When the control terminal determines that the breakage risk coefficient is greater than the set value, it stops construction and outputs information to the user terminal.

[0016] Preferably, the user terminal sets a new intermediate layer with the total installation distance of the already installed ductile iron jacking pipe 1 as the length.

[0017] The technical effects of this invention are as follows:

[0018] Precise control of the slip material: By monitoring the frictional resistance of the seabed against the pipe wall and the slip material seepage velocity in real time through the pressure sensing end (adding a seawater permeation variable), the amount of slip material injected is dynamically adjusted to solve the problem of uncontrollable mud jacket formation state in ocean current environment;

[0019] Continuous construction in deep sea: Based on a multi-dimensional fracture risk model of axial stress, circumferential stress and radial stress, the bearing limit of the terminal pipeline in high-pressure seawater is accurately calculated;

[0020] Marine environmental adaptability: Corrosion-resistant metal mounting strips and sealed pressure sensing ends ensure the long-term stability of the sensor in a 10MPa high-pressure seawater environment, and prevent marine pollution accidents caused by pipe rupture through real-time risk warning. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of any ductile iron jacking pipe of the present invention;

[0022] Figure 2 This is a connection diagram of multiple ductile iron jacking pipes according to the present invention;

[0023] Figure 3 This is a control block diagram of the present invention.

[0024] Attached Figure

[0025] 1. Ductile iron jacking pipe; 2. Socket joint; 21. First pressure sensing end; 22. Second pressure sensing end; 3. Insertion end; 4. Sliding material outlet; 5. Metal mounting strip; 51. Third pressure sensing end; 52. Fourth pressure sensing end. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0027] refer to Figures 1-3 A type of ductile iron jacking pipe for internal action integral trenchless pipeline construction includes a ductile iron jacking pipe 1 and a control end. The two sides of the ductile iron jacking pipe 1 are integrally formed with a socket 2 and a plug end 3. The inner wall of the socket 2 is provided with a first pressure sensing end 21 and a second pressure sensing end 22. The top of the ductile iron jacking pipe 1 and the surface of the ductile iron jacking pipe 1 are provided with a sliding material outlet 4. The outer surface of the ductile iron jacking pipe 1 is inlaid with a metal mounting strip 5. The two ends of the surface of the metal mounting strip 5 are provided with a third pressure sensing end 51 and a fourth pressure sensing end 52.

[0028] The receiving interface 2 and the plug end 3 are adapted to each other. The first pressure sensing end 21 and the second pressure sensing end 22 are set at the two ends of the cross-sectional diameter of the receiving interface 2. The metal mounting strip 5 is completely embedded in the surface of the ductile iron jacking pipe 1. The metal mounting strip 5, the third pressure sensing end 51 and the fourth pressure sensing end 52 are horizontal with the surface of the ductile iron jacking pipe 1.

[0029] The first pressure sensing end 21 and the second pressure sensing end 22 are used to collect the pressure value generated by the plug end 3 on the bearing interface 2, and are respectively recorded as p1 and p2.

[0030] The pressure values ​​on the outer wall of the ductile iron jacking pipe 1 collected by the third pressure sensing end 51 and the fourth pressure sensing end 52 are denoted as p3 and P4, respectively.

[0031] In this embodiment, it should be further explained that the first pressure sensing end 21 and the second pressure sensing end 22, as well as the third pressure sensing end 51 and the fourth pressure sensing end 52, are all pressure sensors. The outer surface of the third pressure sensing end 51 and the fourth pressure sensing end 52 is provided with a resin protective layer. In addition, the length of the metal mounting strip 5 is set to be no less than 20 cm to avoid the problem that the parameters collected by the third pressure sensing end 51 and the fourth pressure sensing end 52 in a single area are too similar. The pressure values ​​collected by the first pressure sensing end 21 and the second pressure sensing end 22 do not consider the data in the initial 5-second period to avoid the problem that the additional pressure data generated by the inertia of the initial connection state will affect the collected data.

[0032] The control terminal includes a data acquisition terminal and a processing terminal. The data acquisition terminal includes a pressure acquisition unit, a time acquisition unit, and a speed acquisition unit. The pressure acquisition unit includes a first pressure sensing end 21, a second pressure sensing end 22, a third pressure sensing end 51, and a fourth pressure sensing end 52. The time acquisition unit is used to acquire the displacement time of the ductile iron jacking pipe 1 and the time of the sliding material spraying at the sliding material outlet 4. The speed acquisition unit is the spraying speed of the sliding material at the sliding material outlet 4 and the moving speed of the ductile iron jacking pipe 1.

[0033] It should be further explained that if the speed deviation of the ductile iron jacking pipe 1 is less than 0.1 meters per second per unit time, it means that the amount of slip material sprayed has reduced the friction to the greatest extent. Otherwise, since the thrust on the ductile iron jacking pipe 1 is constant, the speed of the ductile iron jacking pipe 1 could not be close to a uniform state.

[0034] In this embodiment, the unit time is set to 1-5 seconds. The data transmitted by the first pressure sensing end 21, the second pressure sensing end 22, the third pressure sensing end 51, and the fourth pressure sensing end 52 is at 1 millisecond intervals. That is, the speed parameter collected per unit time is the average of the data collected by the first pressure sensing end 21, the second pressure sensing end 22, the third pressure sensing end 51, and the fourth pressure sensing end 52 after removing the maximum and minimum values. This maximizes the avoidance of data randomness.

[0035] The processing unit is used to calculate the breakage risk coefficient of a single ductile iron jacking pipe 1. The specific calculation process is as follows:

[0036] The risk factor for breakage of the ductile iron jacking pipe 1 is determined by the ratio of the maximum working stress to the material strength. The material strength is a known parameter. The maximum working stress is determined by the maximum value of any one of the axial, radial, and circumferential stresses of the ductile iron jacking pipe 1. The axial stress of the ductile iron jacking pipe 1 is: Where A is the cross-section of the ductile iron jacking pipe 1, and the circumferential stress of the ductile iron jacking pipe 1 is: Where S is the surface area of ​​1, T is the average thickness of ductile iron jacking pipe 1, and the radial stress of ductile iron jacking pipe 1 is assumed to be the average of p1 and p2.

[0037] It should be further explained in this embodiment that by measuring the breakage risk coefficient of the last ductile iron jacking pipe 1, when the breakage risk coefficient is 1, it is assumed that the ductile iron jacking pipe 1 will definitely break. Therefore, the theoretical safety threshold is set to 0.5. In addition, when the breakage risk coefficient of any other ductile iron jacking pipe 1 in multiple unit time periods is greater than 0.5, construction is stopped and sampling and testing are carried out at the location to ensure that no special terrain or installation defects will cause local pipeline damage.

[0038] It should also be noted that when the risk factor of the breakage of the last ductile iron jacking pipe 1 is greater than 0.5, a new intermediate layer will be set with the sum of the installation distances of multiple ductile iron jacking pipes 1 as the length.

[0039] Working principle:

[0040] Preparation stage: Lay guide rails, set up mirror walls and reaction walls, set up jacking and positioning systems at the reaction wall locations, set up sliding material injection systems, and finally place ductile iron jacking pipe 1 on the guide rails corresponding to the jacking system;

[0041] All the equipment involved in the above preparation stage that requires specific explanation is conventional preparation equipment, therefore this embodiment will not provide specific explanations;

[0042] Top-in phase:

[0043] Sliding material output stage: The jacking system pushes the ductile iron jacking pipe 1 through the mirror wall into the seabed, and at the same time, the sliding material injection system is activated. At this time, the sliding material is discharged through the sliding material outlet 4. In this stage, there are more than two ductile iron jacking pipes 1. The insertion end 3 is located in the receiving interface 2 inside the ductile iron jacking pipe 1. At this time, the first pressure sensing end 21 and the second pressure sensing end 22 collect the pressure value generated by the insertion end 3 on the receiving interface 2. The third pressure sensing end 51 and the fourth pressure sensing end 52 are used to collect the pressure value on the outer wall of the ductile iron jacking pipe 1. In addition, the time acquisition unit is used to collect the displacement time of the ductile iron jacking pipe 1. The speed acquisition unit measures the spraying speed of the sliding material at the sliding material outlet 4 and the moving speed of the ductile iron jacking pipe 1. If the moving speed of the ductile iron jacking pipe 1 is constant within a unit time, the sliding material injection system maintains a constant feeding speed. If the moving speed of the ductile iron jacking pipe 1 decreases significantly, the feeding speed is increased until the moving speed of the ductile iron jacking pipe 1 is constant. At this time, the feeding speed of the sliding material injection system is reduced to the previous stage. If the moving speed of the ductile iron jacking pipe 1 decreases significantly, the sliding material injection system accelerates again without reversing, thus completing the initial jacking stage.

[0044] During the continuous advance phase: the jacking system increases the thrust as the number of ductile iron jacking pipes 1 increases. The first ductile iron jacking pipe 1 to enter the ground experiences the greatest force, so the data collected focuses on the last one, while the ductile iron jacking pipes 1 in other locations are only used for differential data analysis. At this time, the risk coefficient of ductile iron jacking pipe 1 is obtained based on the pressure data collected. When the risk coefficient of ductile iron jacking pipe 1 is greater than the threshold, the jacking is stopped and a new intermediate layer is set. This ultimately achieves accurate judgment on whether to set an intermediate layer and avoids excessive construction. Example

[0045] The specific difference between Example 1 and Example 2 is that the breakage risk factor of the ductile iron jacking pipe 1 is determined by the ratio of the maximum working stress to the material strength. The material strength is an existing parameter, and the maximum working stress is determined by the minimum value of any one of the axial, radial, and circumferential stresses of the ductile iron jacking pipe 1. The axial stress of the ductile iron jacking pipe 1 is: Where A is the cross-section of the ductile iron jacking pipe 1, and the circumferential stress of the ductile iron jacking pipe 1 is: Where S is the surface area of ​​1, T is the average thickness of ductile iron jacking pipe 1, and the radial stress of ductile iron jacking pipe 1 is assumed to be the average of p1 and p2.

[0046] Compared with Example 1, Example 2 calculates a more conservative risk factor for the breakage of the ductile iron jacking pipe 1, making it suitable for applications in areas with diverse geological formations.

[0047] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A ductile iron jacking pipe for internal action integral trenchless pipeline construction, comprising a ductile iron jacking pipe (1), characterized in that, It also includes a control end. The two sides of the ductile iron jacking pipe (1) are integrally formed with a receiving interface (2) and a plug-in end (3). The inner wall of the receiving interface (2) is provided with a first pressure sensing end (21) and a second pressure sensing end (22). The surface of the ductile iron jacking pipe (1) is provided with a sliding material outlet (4). The outer surface of the ductile iron jacking pipe (1) is inlaid with a metal mounting strip (5). The two ends of the surface of the metal mounting strip (5) are provided with a third pressure sensing end (51) and a fourth pressure sensing end (52). The socket (2) and the plug (3) are mutually adapted. The first pressure sensing end (21) and the second pressure sensing end (22) are set at the two ends of the cross-sectional diameter of the socket (2). The metal mounting strip (5) is completely embedded in the surface of the ductile iron jacking pipe (1). The metal mounting strip (5), the third pressure sensing end (51), and the fourth pressure sensing end (52) are horizontal with the surface of the ductile iron jacking pipe (1). The control end includes a data acquisition end and a processing end. The data acquisition end includes a pressure acquisition unit, a time acquisition unit, and a speed acquisition unit. The pressure acquisition unit includes a first pressure sensing end (21), a second pressure sensing end (22), and a third pressure sensing end (22). 22) The third pressure sensing end (51) and the fourth pressure sensing end (52) are used to calculate the breakage risk coefficient of a single ductile iron jacking pipe (1). The calculation process of the breakage risk coefficient of the ductile iron jacking pipe (1) is as follows: the breakage risk coefficient of the ductile iron jacking pipe (1) is determined by the ratio of the maximum working stress to the material strength. The material strength is an existing parameter. The maximum working stress is determined by any maximum value of the axial, radial and circumferential stress of the ductile iron jacking pipe (1). The processing end calculates the breakage risk coefficient and outputs it to the control end. When the control end determines that the breakage risk coefficient is greater than the set value, the construction is stopped and the information is output to the user end.

2. The ductile iron jacking pipe for internal action integral trenchless pipeline construction as described in claim 1, characterized in that, The first pressure sensing end (21) and the second pressure sensing end (22) are used to collect the pressure value generated by the plug end (3) on the bearing interface (2), and are respectively recorded as p1 and p2.

3. A ductile iron jacking pipe for internal action integral trenchless pipeline construction as described in claim 1, characterized in that, The third pressure sensing end (51) and the fourth pressure sensing end (52) are used to collect the pressure values ​​on the outer wall of the ductile iron jacking pipe (1), which are recorded as p3 and p4 respectively.

4. A ductile iron jacking pipe for internal action integral trenchless pipeline construction as described in claim 1, characterized in that, The time acquisition unit is used to acquire the displacement time of the ductile iron jacking pipe (1) and the time of the sliding material spraying at the sliding material outlet (4). The speed acquisition unit is the spraying speed of the sliding material at the sliding material outlet (4) and the moving speed of the ductile iron jacking pipe (1).

5. A ductile iron jacking pipe for internal action integral trenchless pipeline construction as described in claim 1, characterized in that, The user terminal sets a new intermediate layer with the total installation distance of the installed ductile iron jacking pipe (1) as the length.

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