A ductile construction for preventing deformation failure of a super-large diameter pipe across a fault

Abstract

The application discloses a ductile structure for preventing deformation and damage of a super-large-diameter pipeline across a fault, which comprises an inclined pipe, two straight pipes fixed at two ends of the inclined pipe respectively, the straight pipes being parallel to each other and staggered, a fixing sleeve sleeved at the end of the straight pipe, the fixing sleeve being connected with the ground through a support, a movable pipe movably arranged in each straight pipe, and the movable pipe being attached to the straight pipe through a sealing ring. Compared with the prior art, the device can buffer and reduce the deformation of the pipeline across the fault, protect the pipeline from the stress and vibration caused by the fault dislocation, improve the anti-seismic performance of the pipeline system, and reduce the risk of damage of the pipeline through the elastic connection, the damping function and the adaptive design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline engineering, in particular to a ductile structure for preventing deformation and damage of super-large diameter pipeline across fault. BACKGROUND

[0002] In areas with frequent seismic activity, crossing faults is an important consideration for pipeline engineering. When the pipeline crosses the fault, the fault movement may cause the ground on both sides of the fault to be significantly up and down and translate, causing the pipeline to be subjected to a large stress and deformation, and thus leading to rupture and damage. Therefore, in order to protect the integrity and stability of the pipeline, researchers have been working to develop an effective technology to solve the problem of crossing faults for pipeline engineering. At present, there are some solutions to deal with the problem of pipeline engineering across the fault. One common method is to set special expansion joints or compensators on both sides of the pipeline, which can absorb the deformation of the pipeline when an earthquake occurs, thereby reducing the stress and vibration of the pipeline. However, this technology has some shortcomings. First, the existing expansion joints or compensators are mainly suitable for small diameter pipelines, and their application in super-large diameter pipelines is relatively rare. Since super-large diameter pipelines have higher stiffness and load capacity requirements, traditional expansion joints or compensators often cannot meet the needs of coping with the large deformation caused by fault movement. Second, the existing expansion joints or compensators can only stretch in one direction and cannot solve the problem of vertical and axial deformation at the same time. However, when the fault moves, the ground will not only be up and down, but also may be displaced in the opposite direction. In addition, the existing solutions also have limitations in terms of adaptability to changes in seismic activity. The intensity and direction of seismic activity may change constantly, so the solution needs to have a certain adaptability to automatically adjust and adapt to changes in seismic activity to maintain the stability and seismic performance of the pipeline system.

[0003] Therefore, it is necessary to further research and develop a more ductile structure to effectively solve these problems and ensure the safe and reliable operation of the pipeline system. SUMMARY

[0004] To achieve the above purpose, the present application provides the following technical scheme: a ductile structure for preventing deformation and damage of super-large diameter pipeline across fault, comprising an inclined pipe, two straight pipes are fixed at both ends of the inclined pipe, the straight pipes are parallel to each other and staggered, a fixing sleeve is sleeved at the end of the straight pipe, the fixing sleeve is connected with the ground through a support, an activity pipe is movably arranged in each straight pipe, and the activity pipe is attached to the straight pipe through a sealing ring.

[0005] Further, as a preferred, the inclined pipe and the straight pipes at both ends are provided with an inner pipe, and two activity pipes are sleeved at both ends of the inner pipe.

[0006] Further, as preferred, the two said inclined pipes and straight pipes are connected by elastic connecting rings, so that the inclined angles of the inclined pipes and straight pipes can be changed.

[0007] Further, as preferred, springs are arranged in the gaps between the movable pipes and straight pipes, so that the movable pipes and straight pipes are elastically connected.

[0008] Further, as preferred, the inner pipes and straight pipes are connected by elastic filling, so that the inner pipes and straight pipes can also be inclined to each other.

[0009] Further, as preferred, a connecting sleeve is rotatably arranged in the movable pipe, a plurality of connecting rods are fixed in the connecting sleeve, the connecting rods slidably penetrate a fixed sleeve, the other ends of the connecting rods are fixed in a sliding sleeve, and the sliding sleeve is slidably sleeved in the corresponding straight pipe.

[0010] Further, as preferred, the sliding sleeve of one end of the straight pipe is fixed in the fixed sleeve of the other end by a pull rope, and the sliding sleeve of the other end of the straight pipe is fixed in the fixed sleeve of the end by another pull rope.

[0011] Further, as preferred, a center sleeve is fixed in the middle of the inclined pipe, the pull rope movably penetrates the center sleeve, and the center sleeve is in contact with the pull rope by graphite material.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] In areas with frequent seismic activities, pipelines crossing faults are easily subjected to great stress and deformation. The device can make the pipeline correspondingly staggered up and down and stretched and contracted when an earthquake occurs, so as to offset the vertical and axial stress on the pipeline caused by fault dislocation, thereby reducing the deformation degree of the pipeline and protecting the pipeline from rupture and damage caused by fault dislocation.

[0014] The device uses springs, elastic connecting rings and elastic filling elements, so that the pipeline system has the characteristics of elastic connection at the fault crossing. These elements can absorb and disperse the energy and vibration caused by earthquakes, and play a role in shock absorption. When an earthquake occurs, the ground vibration will gradually reduce the transmission and influence through the elastic connection, reduce the acting force and vibration amplitude of the pipeline, reduce stress concentration, and help to reduce the stress concentration degree of the pipeline, thereby reducing the risk of pipeline damage.

[0015] The inclined and straight pipes in the device are connected by an elastic connecting ring, allowing the inclination angle of the inclined and straight pipes to be changed. When the ground displaces, the elastic connecting ring allows relative movement between the inclined and straight pipes to adjust the inclination angle to adapt to changes in seismic activity. This helps reduce radial stress on the piping system and improves its seismic performance.

[0016] To address the issue of movable pipes losing their mobility due to pressure variations within a piping system, this device employs a structure consisting of a connecting sleeve, a connecting rod, and a sliding sleeve. By controlling the position of the sliding sleeve, the expansion and contraction of the movable pipe can be controlled, allowing it to adapt to pressure changes within the piping system while maintaining its vibration damping function.

[0017] A central sleeve is fixed in the middle of the device, which is attached to the pull rope by graphite material to restrict the position of the pull rope and keep it parallel to the straight pipe, avoiding friction with the pipeline system. This helps protect the stability and normal operation of the pipeline system. Attached Figure Description

[0018] Figure 1 A schematic diagram of a ductile structure for preventing deformation and failure of ultra-large diameter pipelines crossing faults;

[0019] Figure 2 A cross-sectional schematic diagram of a tough structure used to prevent deformation and failure of ultra-large diameter pipelines crossing faults;

[0020] In the diagram: 1. Inclined tube; 2. Straight tube; 3. Fixed sleeve; 4. Support; 5. Movable tube; 6. Connecting sleeve; 7. Connecting rod; 8. Sliding sleeve; 9. Center sleeve; 10. Pull rope; 11. Inner tube; 12. Spring; 13. Elastic connecting ring; 14. Elastic filler. Detailed Implementation

[0021] Crossing faults is a crucial consideration for pipeline engineering, especially in seismically active regions. When a pipeline crosses a fault, earthquakes can cause significant vertical and horizontal displacement of the ground surface on either side of the fault, subjecting the pipeline to immense stress and deformation, potentially leading to rupture and damage. To address this technical challenge:

[0022] Please see Figure 1 and Figure 2In this embodiment of the invention, a tough structure for preventing deformation and damage of ultra-large diameter pipelines crossing faults includes an inclined pipe 1, with two straight pipes 2 fixed at both ends of the inclined pipe 1. The straight pipes 2 are parallel to each other and staggered. A fixing sleeve 3 is fitted at the end of each straight pipe 2. The fixing sleeve 3 is connected to the ground through a support 4. A movable pipe 5 is provided inside each section of the straight pipe 2. The movable pipe 5 is fitted to the straight pipe 2 through a sealing ring. Two supports 4 are fixed to two rock blocks of the fault respectively. When the pipeline is installed, the two straight pipes 2 are in a position that is offset to the left and right. When an earthquake occurs, the fault displacement causes the ground surface corresponding to the two supports 4 to be displaced. The inclined pipe 1 rotates so that the two straight pipes 2 can be offset vertically to counteract the vertical stress generated by the fault displacement on the pipeline. When the fault displacement causes the ground surface to move in opposite directions, the movable pipe 5 can extend and retract within the straight pipe 2 to counteract the axial stress generated by the fault displacement on the pipeline. Through this design, the device can buffer and reduce the deformation of the pipeline across the fault and protect the pipeline from the stress and vibration caused by the fault displacement.

[0023] In this embodiment, the inclined tube 1 and the straight tubes 2 at both ends are provided with an inner tube 11, and the two movable tubes 5 are respectively sleeved on both ends of the inner tube 11. The two movable tubes 5 are connected by the inner tube 11, and the stability of the movable tubes 5 is improved because the movable tubes 5 are sandwiched between the straight tubes 2 and the inner tube 11.

[0024] In this embodiment, the two sections of the inclined pipe 1 and the straight pipe 2 are connected by an elastic connecting ring 13, allowing the inclination angle of the inclined pipe 1 and the straight pipe 2 to be changed. When the ground surface undergoes displacement, the elastic connecting ring 13 allows relative movement between the inclined pipe 1 and the straight pipe 2 to adjust the inclination angle to adapt to changes in seismic activity, which helps to reduce the radial stress on the pipeline system and improve the seismic performance of the pipeline system.

[0025] In this embodiment, a spring 12 is provided in the gap between the movable tube 5 and the straight tube 2, so that the movable tube 5 and the straight tube 2 can be elastically connected by the spring 12.

[0026] In this embodiment, the inner tube 11 and the straight tube 2 are connected together by an elastic filler 14, so that the inner tube 11 and the straight tube 2 can also tilt towards each other.

[0027] Spring 12, elastic connecting ring 13, and elastic filler 14 enable the pipeline system to be elastically connected at the fault crossing, which can absorb and disperse the energy and vibration caused by the earthquake, thus playing a role in shock absorption. When an earthquake occurs, the ground vibration will be transmitted to the pipeline system, but through the elastic connection, the transmission and impact of the vibration can be reduced, thereby reducing the force and vibration amplitude on the pipeline, reducing the possibility of stress concentration, helping to reduce the degree of stress concentration in the pipeline, and reducing the risk of pipeline damage.

[0028] Because the movable pipe 5 is movably connected to the straight pipe 2, when the pressure in the pipeline system is high, even without an earthquake, the pressure will cause the movable pipe 5 to move outward. This will push the movable pipe 5 to its limit, causing it to lose its ability to move away from the inclined pipe 1, and preventing the spring 12 from providing axial damping. To solve this technical problem:

[0029] In this embodiment, a connecting sleeve 6 is rotatably provided in the movable tube 5, and multiple connecting rods 7 are fixed in the connecting sleeve 6. The connecting rods 7 slidably pass through the fixed sleeve 3, and the other end of the connecting rod 7 is fixed to a sliding sleeve 8. The sliding sleeve 8 is slidably fitted into the corresponding straight tube 2. By controlling the position of the sliding sleeve 8, the extension and retraction of the movable tube 5 can be controlled without hindering the rotation of the movable tube 5.

[0030] In this embodiment, the sliding sleeve 8 corresponding to one end of the straight pipe 2 is fixed to the fixed sleeve 3 at the other end by a pull rope 10, and the sliding sleeve 8 corresponding to the other end of the straight pipe 2 is fixed to the fixed sleeve 3 at that end by another pull rope 10. When no earthquake occurs, since the positions of the two supports 4 are fixed, the tension of the pull rope 10 counteracts the pressure in the pipeline system. Under the action of the pull rope 10, the sliding sleeve 8 is restricted to the middle of the straight pipe 2. When an earthquake occurs and the positions of the two supports 4 are brought closer, the tension of the pull rope 10 disappears, and the two movable pipes 5 can move elastically to counteract the axial stress of the earthquake. When an earthquake occurs and the positions of the two supports 4 are moved away, the pull rope 10 pulls the two movable pipes 5 closer together, and the two movable pipes 5 can also counteract the axial stress of the earthquake through the elastic force of the spring 12.

[0031] In this embodiment, a central sleeve 9 is fixed in the middle of the inclined tube 1, and the pull rope 10 movably passes through the central sleeve 9. The central sleeve 9 is attached to the pull rope 10 by means of graphite material. The central sleeve 9 can restrict the position of the pull rope 10, keeping the pull rope 10 parallel to the straight tube 2 and avoiding friction with the pipeline system.

[0032] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A ductile structure for preventing deformation and failure of ultra-large diameter pipelines crossing faults, comprising an inclined tube (1), characterized in that, Two straight pipes (2) are fixed at both ends of the inclined pipe (1). The straight pipes (2) are parallel to each other and staggered. A fixed sleeve (3) is fitted at the end of the straight pipe (2). The fixed sleeve (3) is connected to the ground through a support (4). A movable pipe (5) is provided in each section of the straight pipe (2). The movable pipe (5) is fitted to the straight pipe (2) through a sealing ring. The inclined tube (1) and the straight tubes (2) at both ends are provided with an inner tube (11), and the two movable tubes (5) are respectively sleeved on both ends of the inner tube (11); The two ends of the inclined tube (1) and the straight tube (2) are connected by an elastic connecting ring (13), so that the inclination angle of the inclined tube (1) and the straight tube (2) can be changed; A spring (12) is provided in the gap between the movable tube (5) and the straight tube (2), and the movable tube (5) and the straight tube (2) can be elastically connected by the spring (12); The inner tube (11) and the inclined tube (1) are connected together by an elastic filler (14), so that the inner tube (11) and the inclined tube (1) can also be inclined to each other; The movable tube (5) is rotatably provided with a connecting sleeve (6), and multiple connecting rods (7) are fixed in the connecting sleeve (6). The connecting rods (7) slide through the fixed sleeve (3), and the other end of the connecting rods (7) is fixed to the sliding sleeve (8). The sliding sleeve (8) is slidably fitted in the corresponding straight tube (2). The sliding sleeve (8) corresponding to the straight tube (2) at one end is fixed to the fixed sleeve (3) at the other end by a pull rope (10), and the sliding sleeve (8) corresponding to the straight tube (2) at the other end is fixed to the fixed sleeve (3) at that end by another pull rope (10).

2. A ductile structure for preventing deformation and failure of ultra-large diameter pipelines crossing faults according to claim 1, characterized in that, A central sleeve (9) is fixed in the middle of the inclined tube (1), and the pull rope (10) is movably inserted through the central sleeve (9). The central sleeve (9) is attached to the pull rope (10) by graphite material.

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