Device and method for preventing and controlling frost heaving of pipe foundation soil of buried cold-conveying natural gas pipelineTechnical Field
The invention relates to the technical field of frost heaving prevention and control devices, in particular to a buried cold transportation natural gas pipeline pipe foundation soil frost heaving prevention and control device and method.
Background
The natural gas pipeline is an indispensable device for conveying natural gas, the pipeline is buried underground, water with higher temperature is transferred to a soil layer with lower temperature under the influence of low temperature in winter, water is rapidly gathered and gradually forms an ice-gathering layer under the action of temperature difference water gathering (temperature gradient and water migration), so that the water on the surface layer of the roadbed is continuously increased, the expansion of soil body after icing is increased, frost heaving is formed, the natural gas pipeline is easy to damage, and the existing control method mainly comprises a filling method, a heat preservation method, a water-proof drainage method and a chemical treatment method; the cost of the replacement filling method is high, the heat preservation method only uses heat preservation materials, the heat preservation effect is general, and the control effect cannot be ensured; the water-proof drainage method only plays a role in water-proof, the temperature of the soil can not be guaranteed, and the soil still has the risk of frost heaving.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a device and a method for preventing and controlling the frost heaving of the base soil of the buried cold transmission natural gas pipeline, which aim to solve the technical problems that the cost of prevention and control is high, the heat preservation effect is common and the prevention and control effect cannot be ensured in the prior art.
The technical scheme of the invention is as follows: a device for preventing and controlling frost heaving of a pipe base soil of a buried cold-conveying natural gas pipeline comprises a water-resisting layer; the solar heat-insulation system further comprises geotechnical cloth, a first heat-insulation layer, a second heat-insulation layer, an S-shaped heat-insulation pipeline, a heat storage water tank assembly, a control cabinet assembly, a bracket assembly, an angle adjusting assembly, a solar panel, a liquid supply assembly and a return pipe; the upper end of the water-resisting layer is sequentially provided with geotextile, a first heat-preserving layer, a second heat-preserving layer and an antifreezing layer; an S-shaped heat-insulating pipeline is laid in the second heat-insulating layer; the rear end of the heat storage water tank component is provided with a control cabinet component and a bracket component in sequence; an angle adjusting component for adjusting the inclination angle of the bracket component is arranged on the inner side of the bracket component; the upper end of the bracket component is provided with a solar panel; the left end of the heat storage water tank component is provided with a liquid supply component connected with the inlet end of the S-shaped heat preservation pipeline; the outlet end of the S-shaped heat preservation pipeline is provided with a return pipe; the return pipe extends from the upper end of the heat storage water tank assembly into the heat storage water tank assembly.
Preferably, the water-resistant layer is made of gravel and soil; the mass ratio of the gravel to the soil is 99:1 to 5; the raw materials of the antifreezing layer are antifreezing agents, and the gravel and the soil can play a role in isolating underground water and cut off capillary water from rising.
Preferably, the first heat-insulating layer is made of polyethylene sound-insulating heat-insulating coiled materials; the second heat preservation layer is a heat preservation material, and is any one or more of foam concrete, glass fiber and polystyrene foam, and the first heat preservation layer and the second heat preservation layer are utilized to increase heat resistance, so that the risk of frost heaving of foundation soil is eliminated or reduced.
Preferably, the thermal storage water tank assembly includes a water tank body; the upper end of the water tank body is provided with a detachable water tank cover; a baffle is arranged at the upper end of the inner bottom of the water tank body; a gap is arranged between the rear end of the baffle plate and the inner wall of the rear side of the box body; the heating rods distributed at equal intervals are arranged on the inner walls of the left end and the right end of the water tank body, and the water body is heated by the heating rods, so that the temperature of the soil can be raised, and frost heaving caused by too low temperature is avoided.
Preferably, the control cabinet assembly comprises a cabinet body; a storage battery is arranged in the cabinet body; the rear end of the cabinet body is rotationally connected with a cabinet door; the cabinet body is also internally provided with a monitoring instrument and an inverter, the inverter is used for converting direct current generated by the solar cell panel into alternating current, the storage battery is used for storing electric energy generated by solar energy, and electric energy required by equipment is provided in overcast and rainy days.
Preferably, the bracket assembly comprises a mounting plate and a vertical column; the lower end of the mounting plate is fixedly connected with a rotating piece; the front end and the rear end of the rotating piece are fixedly connected with rotatable rotating pins which extend outwards through the vertical upright posts; the equal fixedly connected with of mounting panel lower extreme four corners department consolidates the support column, consolidates the steadiness that the support column can further strengthen the mounting panel.
Preferably, the angle adjusting assembly comprises a first U-shaped frame and a second U-shaped frame; the outer sides of the first U-shaped frame and the second U-shaped frame are respectively and rotatably connected with a circular ring; a lifting cylinder is arranged between the circular ring and the other circular ring; the first U-shaped frame is fixedly connected with the vertical upright post; the second U-shaped frame is connected with the mounting plate, and the angle of the mounting plate can be adjusted through the expansion and contraction of the lifting air cylinder, so that the solar cell panel is positioned at the optimal illumination angle.
Preferably, the liquid supply assembly comprises a water pump; the inlet end of the water pump is provided with a first water pipe connected with the water tank body; the second water pipe connected with the S-shaped heat preservation pipeline is arranged at the outlet end of the water pump, so that the circulation of water between the water tank body and the S-shaped heat preservation pipeline is ensured.
The method for preventing and controlling the frost heaving of the pipe base soil of the buried cold transportation natural gas pipeline comprises the following steps of:
step one: paving gravels at the bottom of a foundation pit of a pipeline, filling soil in gaps of the gravels, fully compacting to obtain a water-resisting layer, paving geotextiles on the surface of the water-resisting layer, inserting geotextiles into the staples, then beating the staples with hammers, fixing the geotextiles, cutting, splicing and installing polyethylene sound insulation heat insulation coiled materials on the surface of the geotextiles, ensuring that the polyethylene sound insulation heat insulation coiled materials are attached to a foundation to obtain a first heat insulation layer, covering heat insulation materials on the surface of the first heat insulation layer, fully compacting, paving an S-shaped heat insulation pipeline, connecting an inlet end and an outlet end of the S-shaped heat insulation pipeline with a second water pipe and a return pipe respectively, continuously adding the heat insulation materials, compacting and leveling the heat insulation materials to ensure that the surface is smooth, obtaining a second heat insulation layer, uniformly smearing antifreezing agents on the surface of the second heat insulation layer after construction of the second heat insulation layer is finished, and drying the antifreezing agents to form the antifreezing layer;
step two: the water pump is arranged at the left end of the water tank body, the first water pipe is arranged between the inlet end of the water pump and the water tank body, and the return pipe is inserted into the water tank body from the upper end of the water tank cover;
step three: the storage battery, the monitoring instrument and the inverter are arranged in the cabinet body, the solar cell panel is arranged on the mounting plate, then the vertical upright post is buried in the ground, the lifting cylinder is driven to lift, the circular ring rotates outside the first U-shaped frame and the second U-shaped frame, the mounting plate rotates, the rotating pins at the front end and the rear end of the rotating piece rotate in the vertical upright post and stop at a proper angle, and then the reinforcing support post is fixed between the mounting plate and the ground;
step four: the solar panel converts solar energy into direct current through a photovoltaic effect, the inverter converts the direct current generated by the solar panel into alternating current, the electricity is stored in the storage battery, and the storage battery provides electric energy required by the heating rod;
step five: adding a proper amount of clear water into the water tank body, moving the water to the rear side of the water tank body from the front side of the water tank body along the direction of the baffle plate after adding the clear water through the heating rod, pumping the water out by the water pump, supplying the water to the S-shaped heat preservation pipeline, conducting heat to soil, eliminating or reducing frost heaving of foundation soil, and returning the used water into the water tank body through the S-shaped heat preservation pipeline and the return pipe;
step six: the water-resisting layer isolates the water source supply when the foundation soil is frozen, the capillary water is cut off from rising, the geotechnical cloth is further impermeable and waterproof, and meanwhile, the first heat-insulating layer and the second heat-insulating layer can increase the heat resistance, so that the frost heaving of the foundation soil is eliminated or reduced.
The invention has the beneficial effects that:
1. the frost heaving prevention and treatment cost is effectively reduced without changing and filling non-frost heaving soil, and the water insulation, heat preservation and chemical treatment are combined, so that the thermal resistance is increased, the frost heaving of foundation soil is eliminated or reduced, the underground water is separated from the soil, the prevention and treatment effect is further improved, the soil is heated by hot water in a pipeline to heat the soil, the soil is prevented and treated in all aspects, the soil temperature is effectively prevented from being too low, and the risk of frost heaving is reduced;
2. the waterproof layer and geotechnical cloth effectively keep apart groundwater, the water source supply when cutting off soil frost heaving, cut off capillary water and rise, geotechnical cloth can prevent that groundwater from upwards migrating, play frost heaving prevention and cure' S effect, first heat preservation and second heat preservation can increase thermal resistance simultaneously, thereby eliminate or reduce the frost heaving of foundation soil, solar cell panel provides the required electric energy of water heating in the heat storage water tank subassembly simultaneously, then in with the heat conduction to soil through S type heat preservation pipeline, through the intensification soil, effectively avoid soil temperature too low, further reduce the risk of frost heaving.
Drawings
FIG. 1 shows a first perspective construction schematic diagram of a pipe base soil frost heaving prevention and treatment device for a buried cold transmission natural gas pipeline of the present invention;
FIG. 2 shows a second perspective construction schematic diagram of the buried cold transport natural gas pipeline pipe foundation soil frost heaving prevention and control device of the present invention;
FIG. 3 shows a schematic cross-sectional perspective view of a device for controlling frost heaving of a pipe base of a buried cold-transporting natural gas pipeline according to the present invention;
FIG. 4 shows a schematic perspective view of a bracket assembly and an angle adjusting assembly in the device for preventing and controlling frost heaving of the pipe foundation of the buried cold transmission natural gas pipeline;
FIG. 5 shows a schematic perspective view of an S-shaped heat-insulating pipeline and a liquid supply assembly in the buried cold-conveying natural gas pipeline pipe foundation soil frost heaving prevention and treatment device;
FIG. 6 shows a schematic perspective view of a heat storage water tank assembly in the buried cold-transporting natural gas pipeline pipe foundation soil frost heaving prevention and treatment device according to the present invention;
fig. 7 shows a schematic perspective view of a control cabinet assembly in the buried cold-conveying natural gas pipeline pipe foundation soil frost heaving prevention device.
Reference numerals illustrate: 1. a water-resistant layer; 2. geotextile; 3. a first heat-retaining layer; 4. a second heat-insulating layer; 5. s-shaped heat preservation pipelines; 6. a thermal storage tank assembly; 61. a water tank body; 62. a water tank cover; 63. a baffle plate; 64. a heating rod; 7. a control cabinet assembly; 71. a cabinet body; 72. a storage battery; 73. a cabinet door; 8. a bracket assembly; 81. a mounting plate; 82. a vertical column; 83. a rotating member; 84. a rotation pin; 85. reinforcing the support column; 9. an angle adjustment assembly; 91. a first U-shaped frame; 92. a second U-shaped frame; 93. a circular ring; 94. a lifting cylinder; 10. a solar cell panel; 11. a liquid supply assembly; 111. a water pump; 112. a first water pipe; 113. a second water pipe; 12. a return pipe; 13. an antifreezing layer.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1-3, the present invention provides an embodiment: a device for preventing and controlling frost heaving of a pipe base soil of a buried cold-conveying natural gas pipeline comprises a water-resisting layer 1; the solar heat insulation system further comprises geotechnical cloth 2, a first heat insulation layer 3, a second heat insulation layer 4, an S-shaped heat insulation pipeline 5, a heat storage water tank assembly 6, a control cabinet assembly 7, a bracket assembly 8, an angle adjusting assembly 9, a solar panel 10, a liquid supply assembly 11 and a return pipe 12; the upper end of the water-resisting layer 1 is sequentially provided with geotextile 2, a first heat-preserving layer 3, a second heat-preserving layer 4 and an antifreezing layer 13; an S-shaped heat preservation pipeline 5 is paved in the second heat preservation layer 4; the rear end of the heat storage water tank assembly 6 is provided with a control cabinet assembly 7 and a bracket assembly 8 in sequence; an angle adjusting component 9 for adjusting the inclination angle of the bracket component 8 is arranged on the inner side of the bracket component 8; the upper end of the bracket component 8 is provided with a solar panel 10; the left end of the heat storage water tank assembly 6 is provided with a liquid supply assembly 11 connected with the inlet end of the S-shaped heat preservation pipeline 5; the outlet end of the S-shaped heat preservation pipeline 5 is provided with a return pipe 12; the return pipe 12 extends from the upper end of the heat storage water tank assembly 6 into the heat storage water tank assembly 6; the water-resisting layer 1 is made of gravel and soil; the mass ratio of the gravel to the soil is 99:1 to 5; the raw material of the antifreezing layer 13 is antifreezing agent; the first heat-insulating layer 3 is made of polyethylene sound-insulating heat-insulating coiled materials; the second insulating layer 4 is an insulating material, which is any one or more of foam concrete, glass fiber and polystyrene foam.
Referring to fig. 4, in the present embodiment, the bracket assembly 8 includes a mounting plate 81 and a vertical post 82; the lower end of the mounting plate 81 is fixedly connected with a rotating piece 83; a rotatable rotation pin 84 extending outwards through the vertical column 82 is fixedly connected to the front and rear ends of the rotation member 83; the four corners of the lower end of the mounting plate 81 are fixedly connected with reinforcing support columns 85; the angle adjusting assembly 9 comprises a first U-shaped frame 91 and a second U-shaped frame 92; the outer sides of the first U-shaped frame 91 and the second U-shaped frame 92 are respectively and rotatably connected with a circular ring 93; a lifting cylinder 94 is arranged between the circular ring 93 and the other circular ring 93; the first U-shaped frame 91 is fixedly connected with the vertical upright post 82; the second U-shaped bracket 92 is connected to the mounting plate 81. .
Referring to fig. 5-7, in the present embodiment, the thermal storage tank assembly 6 includes a tank body 61; a detachable water tank cover 62 is arranged at the upper end of the water tank body 61; a baffle plate 63 is arranged at the upper end of the inner bottom of the water tank body 61; a gap is arranged between the rear end of the baffle 63 and the inner wall of the rear side of the box body 61; the inner walls of the left end and the right end of the water tank body 61 are provided with heating rods 64 which are distributed at equal intervals; the control cabinet assembly 7 includes a cabinet 71; a storage battery 72 is arranged in the cabinet 71; the rear end of the cabinet body 71 is rotatably connected with a cabinet door 73; a monitoring instrument and an inverter are also installed in the cabinet 71, and the inverter is used for converting direct current generated by the solar panel 10 into alternating current; the liquid supply assembly 11 includes a water pump 111; the inlet end of the water pump 111 is provided with a first water pipe 112 connected with the water tank body 61; the outlet end of the water pump 111 is provided with a second water pipe 113 connected with the S-shaped heat preservation pipeline 5.
The method for preventing and controlling the frost heaving of the pipe base soil of the buried cold transportation natural gas pipeline comprises the following steps of:
step one: paving gravels at the bottom of a foundation pit of a pipeline, filling soil in gaps of the gravels, fully compacting to obtain a water-resisting layer 1, paving geotextile 2 on the surface of the water-resisting layer 1, inserting staples into the geotextile 2, knocking the staples with a hammer, fixing the geotextile 2, cutting, splicing and installing a polyethylene sound insulation and heat preservation coiled material on the surface of the geotextile 2, ensuring that the polyethylene sound insulation and heat preservation coiled material is attached to a foundation, obtaining a first heat preservation layer 3, covering the surface of the first heat preservation layer 3 with heat preservation materials, fully compacting, paving an inlet end and an outlet end of an S-shaped heat preservation pipeline 5,S type heat preservation pipeline 5, respectively connecting with a second water pipe 113 and a return pipe 12, continuously adding the heat preservation materials, compacting and leveling the heat preservation materials, ensuring that the surface is smooth, and obtaining a second heat preservation layer 4, uniformly smearing an antifreezing agent on the surface of the second heat preservation layer 4 after the construction of the second heat preservation layer 4, and drying the antifreezing agent to form an antifreezing layer 13;
step two: the water pump 111 is installed at the left end of the water tank body 61, the first water pipe 112 is installed between the inlet end of the water pump 111 and the water tank body 61, and the return pipe 12 is inserted into the water tank body 61 from the upper end of the water tank cover 62;
step three: the storage battery 72, the monitoring instrument and the inverter are arranged in the cabinet 71, the solar panel 10 is arranged on the mounting plate 81, then the vertical upright post 82 is buried in the ground, the lifting cylinder 94 is driven to lift, the circular ring 93 rotates outside the first U-shaped frame 91 and the second U-shaped frame 92, the mounting plate 81 rotates, the rotating pins 84 at the front end and the rear end of the rotating piece 83 rotate in the vertical upright post 82 and stop at a proper angle, and then the reinforcing support column 85 is fixed between the mounting plate 81 and the ground;
step four: the solar panel 10 converts solar energy into direct current through a photovoltaic effect, the inverter converts the direct current generated by the solar panel 10 into alternating current, the electricity is stored in the storage battery 72, and the storage battery 72 provides electric energy required by the heating rod 64;
step five: adding a proper amount of clear water into the water tank body 61, moving the water from the front side of the water tank body 61 to the rear side of the water tank body 61 along the direction of the baffle plate 63 after adding the clear water through the heating rod 64, pumping the water out by the water pump 111 and supplying the water to the S-shaped heat preservation pipeline 5, conducting the heat to the soil, eliminating or reducing frost heaving of foundation soil, and returning the used water into the water tank body 61 through the S-shaped heat preservation pipeline 5 and the return pipe 12;
step six: the water-proof layer 1 isolates the water source supply when the foundation soil is frozen, the capillary water is cut off from rising, the geotechnical cloth 2 is further impervious to water, and meanwhile, the first heat-insulating layer 3 and the second heat-insulating layer 4 can increase the heat resistance, so that the frost heaving of the foundation soil is eliminated or reduced.
When working, the steps are as follows:
step one: paving gravels at the bottom of a foundation pit of a pipeline, filling soil in gaps of the gravels, fully compacting to obtain a water-resisting layer 1, paving geotextile 2 on the surface of the water-resisting layer 1, inserting staples into the geotextile 2, knocking the staples with a hammer, fixing the geotextile 2, cutting, splicing and installing a polyethylene sound insulation and heat preservation coiled material on the surface of the geotextile 2, ensuring that the polyethylene sound insulation and heat preservation coiled material is attached to a foundation, obtaining a first heat preservation layer 3, covering the surface of the first heat preservation layer 3 with heat preservation materials, fully compacting, paving an inlet end and an outlet end of an S-shaped heat preservation pipeline 5,S type heat preservation pipeline 5, respectively connecting with a second water pipe 113 and a return pipe 12, continuously adding the heat preservation materials, compacting and leveling the heat preservation materials, ensuring that the surface is smooth, and obtaining a second heat preservation layer 4, uniformly smearing an antifreezing agent on the surface of the second heat preservation layer 4 after the construction of the second heat preservation layer 4, and drying the antifreezing agent to form an antifreezing layer 13;
step two: the water pump 111 is installed at the left end of the water tank body 61, the first water pipe 112 is installed between the inlet end of the water pump 111 and the water tank body 61, and the return pipe 12 is inserted into the water tank body 61 from the upper end of the water tank cover 62;
step three: the storage battery 72, the monitoring instrument and the inverter are arranged in the cabinet 71, the solar panel 10 is arranged on the mounting plate 81, then the vertical upright post 82 is buried in the ground, the lifting cylinder 94 is driven to lift, the circular ring 93 rotates outside the first U-shaped frame 91 and the second U-shaped frame 92, the mounting plate 81 rotates, the rotating pins 84 at the front end and the rear end of the rotating piece 83 rotate in the vertical upright post 82 and stop at a proper angle, and then the reinforcing support column 85 is fixed between the mounting plate 81 and the ground;
step four: the solar panel 10 converts solar energy into direct current through a photovoltaic effect, the inverter converts the direct current generated by the solar panel 10 into alternating current, the electricity is stored in the storage battery 72, and the storage battery 72 provides electric energy required by the heating rod 64;
step five: adding a proper amount of clear water into the water tank body 61, moving the water from the front side of the water tank body 61 to the rear side of the water tank body 61 along the direction of the baffle plate 63 after adding the clear water through the heating rod 64, pumping the water out by the water pump 111 and supplying the water to the S-shaped heat preservation pipeline 5, conducting the heat to the soil, eliminating or reducing frost heaving of foundation soil, and returning the used water into the water tank body 61 through the S-shaped heat preservation pipeline 5 and the return pipe 12;
step six: the water-proof layer 1 isolates the water source supply when the foundation soil is frozen, the capillary water is cut off from rising, the geotechnical cloth 2 is further impervious to water, and meanwhile, the first heat-insulating layer 3 and the second heat-insulating layer 4 can increase the heat resistance, so that the frost heaving of the foundation soil is eliminated or reduced.
Through the steps, the non-frozen expandable soil does not need to be replaced, the cost of frost heaving prevention and treatment is effectively reduced, the water insulation, heat preservation and chemical treatment are combined, the soil is prevented and treated in the whole aspect, the thermal resistance is increased, the frost heaving of foundation soil is eliminated or reduced, the underground water is separated from the soil, the prevention and treatment effect is further improved, the soil is heated by hot water in a pipeline, the soil is heated, the soil temperature is effectively prevented from being too low, and the risk of frost heaving is reduced.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.