Compensation supporting structure and method for preventing land subsidence for urban gas pipeline

Abstract

The invention relates to the technical field of urban pipeline facility engineering, in particular to a ground subsidence prevention compensation supporting structure and method.The ground subsidence prevention compensation supporting structure comprises a gas pipeline buried in the ground and a supporting assembly used for supporting the gas pipeline in a concave area, the supporting assembly comprises an outer rod, and the inner side of the outer rod is slidably connected with a second piston; the top end of the second piston is fixedly connected with an inner rod, the top end of the inner rod is fixedly connected with a supporting piece used for supporting the gas pipeline, the supporting piece is in an arc shape, and a temporary supporting structure is arranged on the portion, in the concave area, of the gas pipeline. According to the gas pipeline supporting device, the temporary supporting effect is achieved through the arranged temporary supporting structure, in the temporary supporting process, the inner rod in the supporting assembly moves upwards under the action of the tension spring to conduct passive supporting compensation, and therefore rigid supporting on the gas pipeline is achieved.

Description

Technical Field

[0001] This invention relates to the field of urban pipeline infrastructure engineering technology, specifically to a compensating support structure and method for preventing ground subsidence in urban gas pipelines. Background Technology

[0002] With the acceleration of urbanization, urban gas pipelines, as a core infrastructure to ensure residents' lives and industrial production, are widely distributed in urban underground spaces. During the pipeline laying process, it is inevitable that they will pass through soft soil areas, backfilled areas, or areas with unstable geological structures. These areas are prone to ground subsidence due to factors such as soil consolidation, groundwater extraction, and disturbance from surrounding construction.

[0003] When ground subsidence occurs, urban gas pipelines experience tensile and bending stresses due to the relative displacement between their buried ends and the subsided area. This is especially true for overhead sections or sections crossing depressions, which lack stable geological support and are highly susceptible to deformation, loosening of joints, and even breakage under uneven subsidence. Damage to gas pipelines not only leads to gas leaks and safety accidents but also causes air pollution, seriously threatening urban public safety and the ecological environment.

[0004] In existing technologies, support solutions for gas pipeline settlement prevention mostly employ elastic supports or fixed bracket structures. For example, some technologies use spring damping components to achieve flexible support, attempting to counteract the displacement caused by settlement. However, this flexible support method cannot provide long-term stable rigid support. When the elastic components experience fatigue aging, or when the pipeline itself is heavy, bending deformation cannot be avoided. Other technologies use fixed brackets rigidly connected to the pipeline, but fixed brackets cannot adapt to displacement changes caused by ground settlement. Instead, the rigid constraint exacerbates stress concentration in the pipeline, further accelerating pipeline damage. Furthermore, such as... Figure 1 As shown, the gas pipeline 2 buried in the ground 1 needs to be supported overhead when passing through the depression area 1a. Due to the difference between the foundation ground material of the depression area 1a and the ground, such as the difference in water content and soil compaction, there is uneven settlement between the depression area 1a and the ground. When the settlement of the depression area 1a is greater than the settlement of the ground 1, the gas pipeline 2 will bend. After being affected by this for a long time, the gas pipeline 2 will be damaged, which will seriously affect the life of the pipeline and the safety of gas transportation. Meanwhile, existing support structures lack the ability to actively adapt to ground settlement, passively bearing the effects of settlement without being able to dynamically compensate and adjust according to the amount of settlement. When the settlement exceeds the bearing capacity of the support structure, the support device must be manually dismantled and rebuilt, resulting in high maintenance costs and affecting the continuity of gas supply. Furthermore, existing technology does not fully consider the environmental protection requirements of gas pipelines, and the support structure is not optimized for leak prevention, making it difficult to provide auxiliary protection when settlement causes minor damage to the pipeline.

[0005] Therefore, there is an urgent need for a support structure and method for preventing ground subsidence in urban gas pipelines that can adapt to complex urban geological conditions, possess both rigid support stability and dynamic compensation flexibility, and meet environmental protection and control requirements. This would solve the problems of insufficient support stability, limited compensation capacity, high maintenance costs, and lack of environmental protection in existing technologies, and ensure the safe and stable operation of urban gas pipelines. Summary of the Invention

[0006] The purpose of this invention is to provide a compensating support structure and method for preventing ground subsidence in urban gas pipelines, in order to solve the problem mentioned in the background art that "when the subsidence in the depression area is greater than the ground subsidence, the gas pipeline will bend, and after being affected by this for a long time, the gas pipeline will be damaged".

[0007] To achieve the above objectives, the present invention provides the following technical solution: a compensating support structure for preventing ground subsidence of urban gas pipelines, comprising a gas pipeline buried in the ground and a support assembly for supporting the gas pipeline in a recessed area, the support assembly comprising an outer rod, a second piston slidably connected to the inner side of the outer rod, an inner rod fixedly connected to the top of the second piston, and a support member for supporting the gas pipeline fixedly connected to the top of the inner rod, the support member being arc-shaped; A vent hole is provided on the inner side of the top of the outer rod. A tension spring is fixedly connected between the top of the second piston and the inner side of the top of the outer rod. Hydraulic oil is filled between the second piston and the inner side of the bottom of the outer rod. A connecting cylinder is fixedly connected to the outer side of the outer rod. An air inlet check valve is connected to the connecting cylinder above the first piston. The first piston is slidably connected to the inner side of the connecting cylinder. The cavity between the bottom of the first piston and the inner side of the bottom of the connecting cylinder is also filled with hydraulic oil. The cavity is connected to the inner side of the bottom of the outer rod through a pipe. An inlet check valve is provided at the connection point. Temporary support structures were installed on the gas pipeline in the recessed area.

[0008] Under the above configuration, when the settlement in the recessed area is greater than the ground settlement, the present invention can provide temporary support through the temporary support structure. During the temporary support process, the inner rod in the support component moves upward under the action of the tension spring to provide passive support compensation, thereby providing rigid support for the gas pipeline. This avoids the problem of the gas pipeline bending caused by the flexible support used in the prior art, which cannot provide a firm rigid support. When the elastic support component is fatigued or the pipeline itself is too heavy, the above-mentioned problem of gas pipeline bending will still occur. The passive compensation method of the support component is as follows: When the recessed area settles, a gap appears between the support component and the gas pipeline under the temporary support of the temporary support structure. At this time, the inner rod will move upward with the second piston under the action of the tension spring. At the same time, the upward movement of the second piston will cause the bottom inner side of the outer rod to draw hydraulic oil from the connecting cylinder through the inlet check valve. At this time, the first piston sinks. Under the action of the inlet check valve, when the support component on the upper side of the inner rod comes into contact with the gas pipeline again, the support component cannot sink, thus playing the role of rigid support. The vent hole and the air inlet check valve set on the inner side of the top of the outer rod play the role of corresponding space gas compensation. Preferably, the bottom end of the second piston is rotatably connected to a side support rod via a hinge, and a torsion spring is fixedly connected between the side support rod and the second piston. A convex ring is provided on the lower side of the second piston, and the convex rings are evenly distributed on the inner side of the outer rod. After the side support rod passes through the convex ring, the side support rod will make contact with the upper surface of the convex ring for support.

[0009] Under the above configuration, when the inner rod moves upward, the side support rod will also move upward. After the side support rod passes the convex ring, under the action of the torsion spring, the side support rod will make contact with the upper surface of the convex ring for support, further playing the role of stage support, preventing problems with the sealing of the hydraulic oil passage, and providing secondary protection; wherein, the bottom height of the hydraulic oil in the connecting cylinder should be higher than the initial position of the second piston. Preferably, the temporary support structure includes four collars fixedly connected to the gas pipeline. The four collars are symmetrically arranged on the left and right sides, with two collars located in the middle of the gas pipeline and the other two collars located at the edge of the recessed area. A traction cable and a support rod are fixedly connected to the collars at the edge. A pulley is rotatably connected to the top of the support rod, and the traction cable is fixedly connected to another collar on the same side after passing through the pulley.

[0010] Under the above configuration, the temporary support structure works as follows: On the outside of the gas pipeline, a collar is provided at the edge of the recessed area. A traction cable is provided between the collar, the pulley, and the collar in the middle of the gas pipeline to form a triangular traction mechanism, thereby achieving temporary support for the gas pipeline. Preferably, the compensation support structure further includes a tilt detection component, which includes a connecting box fixed to the bottom of the gas pipeline. A vertical rod and a fixing rod are provided on the inner side of the connecting box. The top of the vertical rod is rotatably connected to the bottom of the gas pipeline via a hinge. A counterweight ball is fixedly connected to the bottom of the vertical rod. The fixing rod is fixedly connected to the bottom of the gas pipeline. The fixing rod is arranged in an "L" shape, and one side of the "L"-shaped fixing rod opens towards the vertical rod.

[0011] Preferably, the vertical rod is hinged to the side facing the fixed rod, and the inclined rod is vertically downward when the gas pipeline is horizontal. The bottom end of the fixed rod is in contact with the inclined rod. A rope reel capable of obtaining telescopic length is fixedly connected to the inside of the connecting box. The output end of the rope reel is fixedly connected to the inclined rod through a pull rope.

[0012] Preferably, the distance from the connection point of the pull rope and the tilting rod to the center of rotation of the tilting rod is greater than the distance from the contact point between the bottom end of the fixed rod and the tilting rod to the center of rotation of the tilting rod.

[0013] Because after long-term stress, such as repeated settlement in the recessed area, the gas pipeline will be supported by the temporary support structure for a longer period of time, and the traction cable will extend. At this time, the gas pipeline will still bend. The present invention is equipped with a tilt detection component to determine whether the gas pipeline is bent. The tilt detection component can amplify the bending value of the gas pipeline during detection, which facilitates the detection of the tilt detection component and increases the detection sensitivity of the tilt detection component. When a gas pipeline bends, it tilts downwards. The vertical pole, under the action of the counterweight ball, becomes perpendicular to the ground, and the angle between the fixed pole and the vertical pole changes. At this time, the length of the pull rope released by the rope reel increases. That is, when the length of the pull rope released by the rope reel increases, the gas pipeline bends, thus achieving sensitive detection of the gas pipeline. When the gas pipeline bends, the fixed rod will press the tilting rod to move to the left. The tilting rod is made of a lightweight, inflexible material. The bottom end of the tilting rod will pull the rope to move to the left. At this time, because the connection between the rope and the tilting rod and the contact point between the bottom end of the fixed rod and the tilting rod form a lever mechanism, when the fixed rod presses the tilting rod to move to the left, the distance the bottom end of the tilting rod moves to the left will increase, thereby achieving an amplification effect and increasing the sensitivity of the tilt detection component. Preferably, a high-pressure gas cylinder is fixedly connected to the inner side of the top end of the connecting cylinder, and a vent valve is provided at the output end of the high-pressure gas cylinder.

[0014] When the tilt detection component detects that the gas pipeline is tilted, the vent valve at the output end of the high-pressure gas cylinder opens, and the gas pressure on the upper side of the connecting cylinder increases. Under the pressure, more hydraulic oil flows into the inner side of the bottom end of the outer rod, and the inner rod drives the support component to rise, thereby achieving active support for the gas pipeline. After the inner rod drives the support component to rise until the tilt detection component detects that the gas pipeline is horizontal, the vent valve closes again. This invention is powered by a battery, and the rising power source is provided by the high-pressure gas cylinder, so there is no need for a lot of large-scale energy storage devices. Preferably, a traction cable adjustment box is fixedly connected to the collar on the edge, and a winding shaft is rotatably connected to the inner side of the traction cable adjustment box. The outer side of the winding shaft is fixedly connected to one end of the traction cable at the collar on the edge.

[0015] After the gas pipeline is restored to a horizontal position, the extended traction cable may become loose. Workers can rotate the Allen wrench to make the worm gear drive the worm wheel to rotate, so that the extended traction cable can be straightened again, achieving cyclical compensation support. Preferably, a worm gear is coaxially provided on the winding spool, and a worm is rotatably connected to the inner side of the bottom end of the traction cable adjustment box. The worm meshes with the worm gear, and an internal hexagon is fixedly connected to one end of the worm, with the internal hexagon protruding from the inner side of the traction cable adjustment box.

[0016] The steps of the compensation and support method for the overhead section of buried gas pipelines to prevent ground subsidence are as follows: S1: When the settlement of the depression area is greater than the ground settlement, the temporary support structure is set up to serve as temporary support. S2: The inner rod in the support assembly moves upward under the action of the tension spring to provide passive support compensation; S3: When the traction cable in the temporary support structure is stretched by the traction force, the slight bending of the gas pipeline will be detected by the tilt detection component; S4: The vent valve on the high-pressure gas cylinder inside the connecting cylinder opens, and the support assembly performs active compensation.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The city gas pipeline uses a compensation support structure to prevent ground subsidence. When the subsidence in the depression area is greater than the ground subsidence, the temporary support structure can provide temporary support. During the temporary support process, the inner rod in the support component moves upward under the action of the tension spring to passively provide support compensation, thereby achieving rigid support for the gas pipeline. This avoids the problem of the gas pipeline bending caused by the flexible support used in the prior art, which cannot provide a firm rigid support. When the elastic support component is fatigued or the pipeline itself is too heavy, the above-mentioned gas pipeline bending problem will still occur.

[0018] 2. The city's gas pipeline uses a ground subsidence compensation support structure. The passive compensation method of the support components is as follows: When the sunken area subsides, a gap appears between the support component and the gas pipeline under the temporary support of the temporary support structure. At this time, the inner rod will move upward with the second piston under the action of the tension spring. At the same time, the upward movement of the second piston will cause the bottom inner side of the outer rod to draw hydraulic oil from the connecting cylinder through the inlet check valve. At this time, the first piston sinks. Under the action of the inlet check valve, when the support component on the upper side of the inner rod comes into contact with the gas pipeline again, the support component cannot sink, thus playing a rigid support role. The vent hole and air inlet check valve set on the inner side of the top of the outer rod play a corresponding space gas compensation role.

[0019] 3. The city gas pipeline uses a compensating support structure to prevent ground subsidence. When the inner rod moves upward, the side support rod will also move upward. After the side support rod passes the convex ring, under the action of the torsion spring, the side support rod will make contact support with the upper surface of the convex ring, further playing the role of stage support, preventing problems with the sealing of the hydraulic oil passage, and providing a secondary protection function; wherein, the bottom height of the hydraulic oil in the connecting cylinder should be higher than the initial position of the second piston.

[0020] 4. The city gas pipeline uses a compensation support structure to prevent ground subsidence. The working method of the temporary support structure is as follows: On the outside of the gas pipeline, at the edge of the recessed area, a collar is set. A traction cable is set between the collar, the pulley and the collar in the middle of the gas pipeline to form a triangular traction mechanism, thereby realizing the temporary support of the gas pipeline.

[0021] 5. The city's gas pipeline uses a compensating support structure to prevent ground subsidence. Because after long-term stress, if the temporary support structure experiences repeated subsidence in the depression area, the gas pipeline will be supported by the temporary support structure for an extended period of time, and the traction cable will extend. At this time, the gas pipeline will still bend. The present invention is equipped with a tilt detection component to determine whether the gas pipeline has bent. The tilt detection component can amplify the bending value of the gas pipeline during detection, which facilitates the detection of the tilt detection component and increases the detection sensitivity of the tilt detection component.

[0022] 6. The city's gas pipeline uses a compensating support structure to prevent ground settlement. When the gas pipeline bends, it tilts downwards. The vertical rod, under the action of the counterweight ball, becomes perpendicular to the ground, and the angle between the fixed rod and the vertical rod changes. At this time, the length of the pull rope released by the rope reel increases. That is, when the length of the pull rope released by the rope reel increases, the gas pipeline bends, thus achieving sensitive detection of the gas pipeline. When the gas pipeline bends, the fixed rod will press the tilting rod to move to the left. The tilting rod is made of a non-bendable lightweight material. The bottom end of the tilting rod will pull the pull rope to move to the left. At this time, because the connection between the pull rope and the tilting rod and the contact point between the bottom end of the fixed rod and the tilting rod form a lever mechanism, when the fixed rod presses the tilting rod to move to the left, the distance the bottom end of the tilting rod moves to the left will increase, thus achieving an amplification effect and increasing the sensitivity of the tilt detection component.

[0023] 7. The city's gas pipeline uses a compensating support structure to prevent ground subsidence. When the tilt detection component detects that the gas pipeline is tilted, the vent valve at the output end of the high-pressure gas cylinder opens, and the gas pressure on the upper side of the connecting cylinder increases. Under the pressure, more hydraulic oil flows into the inner side of the bottom end of the outer rod, and the inner rod drives the support component to rise, thus achieving active support for the gas pipeline. After the inner rod drives the support component to rise until the tilt detection component detects that the gas pipeline is level, the vent valve closes again. This invention is powered by a battery, and the rising power source is provided by the high-pressure gas cylinder, so there is no need for a large number of large-scale energy storage devices. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall installation structure of the present invention during use; Figure 2 This is a schematic diagram of the overall cross-sectional installation structure of the present invention; Figure 3 This is a schematic diagram of the external structure of the support component of the present invention; Figure 4 This is a schematic cross-sectional view of the overall installation structure of the support component of the present invention; Figure 5 This is a further overall cross-sectional view of the installation structure of the present invention; Figure 6 This is a cross-sectional view of the installation structure of the tilt detection component of the present invention; Figure 7 This is a schematic diagram of a further installation structure for the support component of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the installation structure at point A in the diagram; Figure 9 This is a schematic diagram of the installation structure at the tilting rod of the present invention; Figure 10 This is a schematic diagram of the external structure of the traction cable of the present invention; Figure 11 This is a schematic diagram of the internal installation structure of the traction cable of the present invention.

[0025] In the diagram: 1. Ground; 1a. Depressed area; 2. Gas pipeline; 3. Collar; 4. Support assembly; 5. Traction cable; 6. Pulley; 7. Support rod; 8. Traction cable adjustment box; 9. Connecting box; 10. Vertical rod; 11. Inclined rod; 12. Fixed rod; 13. Rope reel; 14. Counterweight ball; 15. Hex socket head cap; 16. Reel; 17. Worm gear; 18. Worm. 41. Outer rod; 42. Vent hole; 43. Inner rod; 44. Support component; 45. Connecting cylinder; 46. Inlet check valve; 47. First piston; 48. Hydraulic oil; 49. Tension spring; 410. Second piston; 411. Torsion spring; 412. Convex ring; 413. Inlet check valve; 414. High-pressure gas cylinder; 415. Vent valve; 416. Side support rod. 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] Please see Figure 1-4 The present invention provides a technical solution: A compensating support structure and method for preventing ground subsidence in urban gas pipelines. The compensating support structure for preventing ground subsidence in urban gas pipelines includes a gas pipeline 2 buried in the ground 1 and a support component 4 for supporting the gas pipeline 2 in a recessed area 1a. The support component 4 includes an outer rod 41, a second piston 410 slidably connected to the inner side of the outer rod 41, an inner rod 43 fixedly connected to the top of the second piston 410, and a support member 44 for supporting the gas pipeline 2 fixedly connected to the top of the inner rod 43. The support member 44 is arc-shaped. A vent hole 42 is provided on the inner side of the top end of the outer rod 41. A tension spring 49 is fixedly connected between the top end of the second piston 410 and the inner side of the top end of the outer rod 41. Hydraulic oil 48 is filled between the inner side of the bottom end of the second piston 410 and the outer rod 41. A connecting cylinder 45 is fixedly connected to the outer side of the outer rod 41. An air inlet check valve 46 is connected to the connecting cylinder 45 above the first piston 47. The first piston 47 is slidably connected to the inner side of the connecting cylinder 45. Hydraulic oil 48 is also filled in the cavity between the bottom end of the first piston 47 and the inner side of the bottom end of the connecting cylinder 45. The cavity is connected to the inner side of the bottom end of the outer rod 41 through a pipe. An inlet check valve 413 is provided at the connection point. A temporary support structure is installed on the gas pipeline 2 in the recessed area 1a.

[0028] Under the above configuration, when the settlement of the recessed area 1a is greater than the settlement of the ground 1, the present invention can provide temporary support through the temporary support structure. During the temporary support process, the inner rod 43 in the support component 4 moves upward under the action of the tension spring 49 to provide passive support compensation, thereby providing rigid support for the gas pipeline 2. This avoids the problem of the gas pipeline 2 bending caused by the flexible support used in the prior art, which cannot provide a firm rigid support. When the elastic support is fatigued or the pipeline itself is too heavy, the gas pipeline 2 will still bend. The passive compensation method of the support component 4 is as follows: When the recessed area 1a settles, a gap appears between the support member 44 and the gas pipeline 2 under the temporary support of the temporary support structure. At this time, the inner rod 43 will move upward with the second piston 410 under the action of the tension spring 49. At the same time, the upward movement of the second piston 410 will cause the bottom inner side of the outer rod 41 to draw the hydraulic oil 48 in the connecting cylinder 45 through the inlet check valve 413. At this time, the first piston 47 sinks down. Under the action of the inlet check valve 413, when the support member 44 on the upper side of the inner rod 43 contacts the gas pipeline 2 again, the support member 44 cannot sink down, thus playing the role of rigid support. The vent hole 42 and the air inlet check valve 46 set on the inner side of the top of the outer rod 41 play the role of corresponding space gas compensation. Specifically, the bottom end of the second piston 410 is rotatably connected to a side support rod 416 via a hinge. A torsion spring 411 is fixedly connected between the side support rod 416 and the second piston 410. A convex ring 412 is provided on the lower side of the second piston 410. The convex rings 412 are evenly distributed on the inner side of the outer rod 41. After the side support rod 416 passes through the convex ring 412, the side support rod 416 will make contact with the upper surface of the convex ring 412 for support.

[0029] Under the above configuration, when the inner rod 43 moves upward, the side support rod 416 will also move upward. After the side support rod 416 passes over the convex ring 412, under the action of the torsion spring 411, the side support rod 416 will make contact with the upper surface of the convex ring 412 for support, further playing the role of stage support, preventing problems with the sealing of the hydraulic oil 48 passage, and providing a secondary guarantee; wherein, the bottom height of the hydraulic oil 48 in the connecting cylinder 45 should be higher than the initial position of the second piston 410; Specifically, the temporary support structure includes four collars 3 fixedly connected to the gas pipeline 2. The four collars 3 are symmetrically arranged on the left and right sides. Two collars 3 are located in the middle of the gas pipeline 2, and the other two collars 3 are located at the edge of the recessed area 1a. A traction cable 5 and a support rod 7 are fixedly connected to the collars 3 at the edge. A pulley 6 is rotatably connected to the top of the support rod 7. After passing through the pulley 6, the traction cable 5 is fixedly connected to another collar 3 on the same side.

[0030] Under the above configuration, the temporary support structure works as follows: On the outside of the gas pipeline 2, a collar 3 is provided at the edge of the recessed area 1a. A traction cable 5 is provided between the collar 3, the pulley 6 and the collar 3 in the middle of the gas pipeline 2 to form a triangular traction mechanism, thereby achieving temporary support for the gas pipeline 2. Example

[0031] This embodiment is a further improvement on embodiment 1. Please refer to [link / reference]. Figure 1-11 The compensation support structure also includes a tilt detection component, which includes a connection box 9 fixed to the bottom of the gas pipeline 2. A vertical rod 10 and a fixed rod 12 are provided on the inner side of the connection box 9. The top of the vertical rod 10 is rotatably connected to the bottom of the gas pipeline 2 via a hinge. A counterweight ball 14 is fixedly connected to the bottom of the vertical rod 10. The fixed rod 12 is fixedly connected to the bottom of the gas pipeline 2. The fixed rod 12 is arranged in an "L" shape, and one side of the "L" shaped fixed rod 12 faces the vertical rod 10.

[0032] Specifically, the vertical rod 10 is hinged to the side facing the fixed rod 12 and connected to the tilting rod 11. When the gas pipeline 2 is horizontal, the tilting rod 11 is vertically downward. The bottom end of the fixed rod 12 contacts the tilting rod 11. The inner side of the connecting box 9 is fixedly connected to a rope retractor 13 that can obtain the telescopic length. The output end of the rope retractor 13 is fixedly connected to the tilting rod 11 through a pull rope.

[0033] Specifically, the distance L2 from the connection point of the pull rope and the tilting rod 11 to the center of rotation of the tilting rod 11 is greater than the distance L1 from the contact point between the bottom end of the fixed rod 12 and the tilting rod 11 to the center of rotation of the tilting rod 11.

[0034] Because after long-term stress, such as repeated settlement at the depression area 1a, the support time of the gas pipeline 2 under the temporary support structure will increase, and the traction cable 5 will extend. At this time, the gas pipeline 2 will still bend. The present invention is equipped with a tilt detection component to determine whether the gas pipeline 2 is bent. The tilt detection component can amplify the bending value of the gas pipeline 2 during detection, which facilitates the detection of the tilt detection component and increases the detection sensitivity of the tilt detection component. When the gas pipeline 2 bends, it will tilt downwards. The vertical rod 10 will be perpendicular to the ground 1 under the action of the counterweight ball 14. The angle between the fixed rod 12 and the vertical rod 10 will change. At this time, the length of the pull rope released by the rope reel 13 increases. That is, when the length of the pull rope released by the rope reel 13 increases, the gas pipeline 2 bends, thereby achieving sensitive detection of the gas pipeline 2. When the gas pipeline 2 bends, the fixed rod 12 will press the tilting rod 11 to move to the left. The tilting rod 11 is made of a lightweight material that cannot be bent. The bottom end of the tilting rod 11 will pull the rope to move to the left. At this time, because the connection between the rope and the tilting rod 11 and the contact point between the bottom end of the fixed rod 12 and the tilting rod 11 form a lever mechanism with the rotation center as the fulcrum, when the fixed rod 12 presses the tilting rod 11 to move to the left, the distance that the bottom end of the tilting rod 11 moves to the left will increase, thereby achieving an amplification effect and increasing the sensitivity of the tilt detection component. Specifically, a high-pressure gas cylinder 414 is fixedly connected to the inner side of the top of the connecting cylinder 45, and a vent valve 415 is provided at the output end of the high-pressure gas cylinder 414.

[0035] When the tilt detection component detects that the gas pipeline 2 is tilted, the vent valve 415 at the output end of the high-pressure gas cylinder 414 opens, and the air pressure on the upper side of the connecting cylinder 45 increases. Under the pressure, more hydraulic oil 48 flows into the inner side of the bottom end of the outer rod 41, and the inner rod 43 drives the support member 44 to rise, thereby achieving active support for the gas pipeline 2. After the inner rod 43 drives the support member 44 to rise until the tilt detection component detects that the gas pipeline 2 is horizontal, the vent valve 415 closes again. This invention is powered by a battery, and the rising power source is provided by the high-pressure gas cylinder 414, so there is no need for a lot of large-scale energy storage devices. Specifically, the traction cable adjustment box 8 is fixedly connected to the collar 3 on the edge, and the inner side of the traction cable adjustment box 8 is rotatably connected to the winding shaft 16. The outer side of the winding shaft 16 is fixedly connected to one end of the collar 3 at the edge of the traction cable 5.

[0036] After the gas pipeline 2 is restored to a horizontal position, the extended traction cable 5 will become loose. The staff can rotate the internal hexagon 15 to make the worm gear 18 drive the worm wheel 17 to rotate, so that the extended traction cable 5 will be straightened again, thus achieving cyclical compensation support. Specifically, a worm gear 17 is coaxially mounted on the winding spool 16, and a worm 18 is rotatably connected to the inner side of the bottom end of the traction cable adjustment box 8. The worm 18 meshes with the worm gear 17, and an internal hexagon 15 is fixedly connected to one end of the worm 18, which protrudes into the inner side of the traction cable adjustment box 8.

[0037] This invention also discloses a method for compensating and supporting the overhead section of buried gas pipelines to prevent ground subsidence, the steps of which are as follows: S1: When the settlement of the depression area 1a is greater than the settlement of the ground 1, the temporary support structure is set up to serve as a temporary support. S2: The inner rod 43 in the support assembly 4 moves upward under the action of the tension spring 49 to provide passive support compensation; S3: When the traction cable 5 in the temporary support structure is stretched by the traction force, the slight bending of the gas pipeline 2 will be detected by the tilt detection component; S4: The vent valve 415 on the high-pressure gas cylinder 414 inside the connecting tube 45 is opened, and the support assembly 4 performs active compensation.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compensation support structure for preventing ground settlement for a city gas pipeline, comprising a gas pipeline (2) and a recessed area (la) for supporting the gas pipeline (2) buried in the ground (1), characterized in that: The support assembly (4) includes an outer rod (41), a second piston (410) is slidably connected to the inner side of the outer rod (41), an inner rod (43) is fixedly connected to the top of the second piston (410), and a support member (44) for supporting the gas pipeline (2) is fixedly connected to the top of the inner rod (43). The support member (44) is arc-shaped. A vent hole (42) is provided on the inner side of the top end of the outer rod (41). A tension spring (49) is fixedly connected between the top end of the second piston (410) and the inner side of the top end of the outer rod (41). Hydraulic oil (48) is filled between the inner side of the bottom end of the second piston (410) and the outer rod (41). A connecting cylinder (45) is fixedly connected to the outer side of the outer rod (41). An air inlet check valve (46) is connected to the connecting cylinder (45) above the first piston (47). The first piston (47) is slidably connected to the inner side of the connecting cylinder (45). Hydraulic oil (48) is also filled in the cavity between the bottom end of the first piston (47) and the inner side of the bottom end of the connecting cylinder (45). The cavity is connected to the inner side of the bottom end of the outer rod (41) through a pipe. An inlet check valve (413) is provided at the connection. The bottom height of the hydraulic oil (48) in the connecting cylinder (45) is higher than the initial position of the second piston (410). A temporary support structure is provided on the gas pipeline (2) in the recessed area (1a).

2. The ground settlement prevention compensating support structure for a city gas pipeline according to claim 1, characterized by: The bottom end of the second piston (410) is rotatably connected to a side support rod (416) via a hinge. A torsion spring (411) is fixedly connected between the side support rod (416) and the second piston (410). A convex ring (412) is provided on the lower side of the second piston (410). The convex ring (412) is evenly distributed on the inner side of the outer rod (41). After the side support rod (416) passes through the convex ring (412), the side support rod (416) will make contact support with the upper surface of the convex ring (412).

3. The compensation support structure for urban gas pipeline according to claim 2, wherein: The temporary support structure includes four collars (3) fixedly connected to the gas pipeline (2). The four collars (3) are symmetrically arranged on the left and right sides. Two collars (3) are located in the middle of the gas pipeline (2), and the other two collars (3) are located at the edge of the recessed area (1a). A traction cable (5) and a support rod (7) are fixedly connected to the collars (3) at the edge. A pulley (6) is rotatably connected to the top of the support rod (7). The traction cable (5) passes through the pulley (6) and is fixedly connected to another collar (3) on the same side.

4. The compensation support structure for urban gas pipeline according to claim 3, wherein: A high-pressure gas cylinder (414) is fixedly connected to the inner side of the top end of the connecting cylinder (45), and a vent valve (415) is provided at the output end of the high-pressure gas cylinder (414).

5. The compensation support structure for urban gas pipeline according to claim 4, wherein: The compensation support structure further comprises an inclination detection assembly, which comprises a connecting box (9) fixed at the bottom end of the gas pipeline (2), the inner side of the connecting box (9) is provided with a vertical rod (10) and a fixed rod (12), the top end of the vertical rod (10) is hingedly connected with the bottom end of the gas pipeline (2), the bottom end of the vertical rod (10) is fixedly connected with a counterweight ball (14), the fixed rod (12) is fixedly connected with the bottom end of the gas pipeline (2), and the fixed rod (12) is arranged in an "L" shape, and the opening of the "L" shaped fixed rod (12) is directed to the vertical rod (10).

6. The compensation support structure for urban gas pipeline according to claim 5, wherein: The side of the vertical rod (10) directed to the fixed rod (12) is hingedly connected with an inclination rod (11), the inclination rod (11) is vertically downward in the horizontal state of the gas pipeline (2), the bottom end of the fixed rod (12) is in contact with the inclination rod (11), the inner side of the connecting box (9) is fixedly connected with a rope reel (13) capable of obtaining an extension length, and the output end of the rope reel (13) is fixedly connected with the inclination rod (11) through a pull rope.

7. The compensation support structure for urban gas pipeline according to claim 6, wherein: The distance from the connection position of the pull rope and the inclination rod (11) to the rotation center of the inclination rod (11) is greater than the distance from the contact position of the bottom end of the fixed rod (12) and the inclination rod (11) to the rotation center of the inclination rod (11).

8. The compensation support structure for urban gas pipeline according to claim 7, wherein: The grommet (3) on the edge is fixedly connected with a traction cable adjusting box (8), the inner side of the traction cable adjusting box (8) is rotatably connected with a winding shaft (16), and the outer side of the winding shaft (16) is fixedly connected with the traction cable (5) at one end of the grommet (3) on the edge.

9. The compensation support structure for urban gas pipeline according to claim 8, wherein: The winding shaft (16) is coaxially provided with a worm wheel (17), the bottom end of the traction cable adjusting box (8) is rotatably connected with a worm (18) on the inner side, the worm (18) is engaged with the worm wheel (17), one end of the worm (18) is fixedly connected with an internal hexagon (15), and the internal hexagon (15) protrudes out of the inner side of the traction cable adjusting box (8).

10. A method of compensating support for overhead sections of buried gas pipelines to prevent ground subsidence, characterized in that, The compensation support structure according to claim 9 is used, and the steps are as follows: S1: when the settlement amount of the recessed area (1a) is greater than the settlement amount of the ground (1), the temporary support structure is used to play a role of temporary support; S2: the inner rod (43) in the support assembly (4) moves upward under the action of the tension spring (49) to passively support and compensate; S3: when the traction cable (5) in the temporary support structure is stretched under the traction, slight bending of the gas pipeline (2) is detected by the inclination detection assembly; S4: the air release valve (415) on the high-pressure gas cylinder (414) in the connecting cylinder (45) is opened, and the support assembly (4) actively compensates.

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