Road and bridge air pressure energy storage pile foundation system

Abstract

The application discloses a kind of road bridge compressed air energy storage pile foundation systems, comprising: underground gas storage pile energy storage unit, compression purification unit, filter expansion unit, heat exchange unit and road surface heat exchange system;Compression purification unit is configured to compress and cool air, so as to obtain normal temperature high pressure compressed air;Underground gas storage pile energy storage unit includes one or more underground gas storage piles, and the underground gas storage pile is used to store normal temperature high pressure compressed air discharged by compression purification unit;Filter expansion unit is configured to expand normal temperature high pressure compressed air stored in underground gas storage pile;Heat exchange unit includes collector, collector is used to recover heat generated during air compression, and provide heat to road surface heat exchange system, and road surface heat exchange system is configured to remove ice on road surface by receiving heat, and the system of the application can realize the synergistic effect of energy storage peak shaving, structure reinforcement, bridge deck snow melting and deicing and permafrost protection.

Description

Technical Field

[0001] This application relates to the field of road and bridge engineering technology, specifically to a bridge and road pile foundation system with integrated compressed air energy storage function, and also to a multi-energy utilization method of the system in cold northern regions, including the synergistic realization of functions such as energy storage and peak shaving, structural reinforcement, bridge deck snow melting and de-icing, and permafrost protection. Background Technology

[0002] In road and bridge engineering, pile foundations, as the core load-bearing structure, directly affect the service life of bridges and roads. Especially in the cold regions of northern my country, bridge pile foundations face multiple technical challenges: First, seasonal frost heave causes pull-out forces on the pile foundations. Traditional anti-frost heave measures (such as replacing with non-frost-susceptible soil and installing insulation layers) can only passively alleviate frost damage and cannot achieve active energy utilization. Second, bridge deck icing in winter requires de-icing agents, but chloride-based de-icing agents exacerbate steel corrosion, significantly increasing bridge maintenance costs (statistics show that de-icing agent corrosion accounts for 30%-40% of bridge life loss). Third, there is an urgent need for renewable energy consumption. Northern regions have large installed capacities of wind and solar power, but high curtailment rates, while traditional ground-based energy storage systems occupy large areas, creating a significant conflict with road and bridge engineering for land.

[0003] Existing compressed air energy storage (CAES) technology is mainly applied to large power plants or independent energy storage facilities. These devices are large in size, have high requirements for geological conditions, and are difficult to integrate with road and bridge pile foundations. Limited research on pile foundation energy storage focuses on geothermal or electrical energy storage, and a technical solution that deeply integrates compressed air energy storage systems with the functions of pile foundation structures has not yet been developed. In particular, there is a lack of design for the comprehensive utilization of the compression heat and expansion cold energy generated during the energy storage process. For example, the high heat (up to 200-300℃) generated during compressed air in traditional CAES systems is not effectively recovered and is directly emitted, leading to energy waste. However, bridges in northern regions require winter heating to address frost heave and bridge deck icing issues, and existing technologies have failed to achieve the complementary advantages of both.

[0004] Furthermore, existing road and bridge pile foundation designs only consider structural load-bearing functions and do not explore their potential as distributed energy storage carriers. With the advancement of the "dual carbon" goals, the transformation of road and bridge infrastructure towards "energy-transportation" integration has become an inevitable trend. There is an urgent need for an innovative system that can integrate multiple functions such as energy storage, heating, and structural health monitoring while fulfilling the load-bearing function of pile foundations, in order to solve problems such as frost damage protection, energy consumption, and high maintenance costs in road and bridge projects in northern regions.

[0005] In response to the above situation, this application proposes a technical solution that deeply integrates a small-sized compressed air energy storage system with road and bridge pile foundations. By making efficient use of the space in the pile foundation structure, it realizes the storage and energy conversion of compressed air, and innovatively uses the heat generated during the energy storage process for snow melting and de-icing on the bridge deck and for frozen soil protection of the pile foundation. At the same time, it uses low-temperature cold energy for structural temperature regulation, forming a multi-energy utilization system that synergistically optimizes "energy storage-structure-environment", filling the gap in the existing technology in the intersection of road and bridge engineering and energy storage technology. Utility Model Content

[0006] The purpose of this application is to provide a compressed air energy storage pile foundation system for roads and bridges. This system uses compressed air stored in the pile foundation system as an energy source and exchanges heat with the road (bridge) surface through a heat exchange unit to meet the heating and cooling needs of the road (bridge) surface.

[0007] This application provides a compressed air energy storage pile foundation system for road and bridge use, including: an underground gas storage pile energy storage unit, a compression and purification unit, a filtration and expansion unit, a heat exchange unit, and a road surface heat exchange system;

[0008] The compression purification unit is configured to compress and cool the air to obtain room temperature high-pressure compressed air.

[0009] The underground gas storage pile energy storage unit includes one or more underground gas storage piles, which are used to store ambient temperature high-pressure compressed air discharged from the compression and purification unit.

[0010] The filter expansion unit is configured to expand the ambient temperature high-pressure compressed air stored in the underground gas storage pile.

[0011] The heat exchange unit includes a heat collector for recovering heat generated during air compression and providing the heat to the road surface heat exchange system, which is configured to de-ice the road surface using the received heat.

[0012] Preferably, the system further includes an energy management controller, which is used to dynamically schedule the gas filling and releasing and the hot-cold flow based on the ambient temperature, traffic load and wind and solar power output, thereby achieving "energy storage-de-icing-anti-freeze heave" synergy.

[0013] In another preferred embodiment, the underground gas storage pile energy storage unit is connected to the compression and purification unit via an air input pipe.

[0014] In another preferred embodiment, the filter expansion unit is connected to the underground gas storage pile via an air output pipe.

[0015] In another preferred embodiment, the compression purification unit includes a first compressor unit and a cooler, the first compressor unit being configured to compress air, and the cooler being connected to the first compressor unit and cooling the high-temperature, high-pressure compressed air discharged by the first compressor unit to obtain room-temperature, high-pressure compressed air.

[0016] In another preferred embodiment, the heat collector is connected to the cooler for recovering heat generated during the air compression process.

[0017] In another preferred embodiment, the compression purification unit further includes a first filter and a first air dryer located on the air input pipe downstream of the cooler, the first filter being used to filter oil, dust and particulate matter in the compressed air, and the first air dryer being used to separate moisture from the compressed air.

[0018] In another preferred embodiment, the system further includes an electric motor for driving the first compressor unit, the electric motor being powered by mains electricity, wind power, or solar energy.

[0019] In another preferred embodiment, when the power of the motor comes from the mains, the surplus power during the off-peak hours of the power grid drives the motor, which in turn drives the first compressor unit.

[0020] In another preferred embodiment, the system further includes a generator, and the filter expansion unit includes a reheater and a turbine expander. The turbine expander is configured to expand the ambient temperature high-pressure compressed air released from the underground gas storage pile during peak grid load periods to drive the generator to generate electricity. The reheater is connected to the solar collector and is used to reheat the ambient temperature high-pressure compressed air before it expands.

[0021] In another preferred embodiment, the electrical energy generated by the generator is provided to the user.

[0022] In another preferred embodiment, the filter expansion unit further includes a second filter and a second air dryer located upstream of the turbine expander unit.

[0023] In another preferred embodiment, the heat from the solar collector can also be provided to the integrated management and control unit, and then provided to the user end through the integrated management and control unit.

[0024] In another preferred embodiment, the road surface heat exchange system includes a heat exchange pipe laid under the road surface, a thermally conductive material in contact with the upper surface of the heat exchange pipe, and a thermal insulation material in contact with the lower surface of the heat exchange pipe. The heat exchange pipe is connected to the solar collector, thereby transferring the heat from the solar collector to the heat exchange pipe, and then transferring the heat in the heat exchange pipe to the road surface or bridge surface through the thermally conductive material.

[0025] In another preferred embodiment, the heat exchange unit further includes a second compressor, a condenser, an expansion valve, and an evaporator, and the heat collector is also connected to the condenser for collecting the heat released by the condenser.

[0026] In another preferred embodiment, the evaporator is also connected to the cooler of the compression purification unit, thereby reducing the cooler temperature through evaporator cooling to improve efficiency.

[0027] In another preferred embodiment, the heat exchange unit supplies the compressed heat to the road surface heat exchange system to melt snow, while the expanded cold is used to embrittle the ice layer and regulate the temperature around the pile through the cold spray pipe.

[0028] In another preferred embodiment, the heat exchange unit further integrates a variable working fluid heat pump circuit with R1233zd(E) working fluid, which is used to transfer excess compression heat to the water storage tank during the non-ice and snow season to achieve seasonal heat storage.

[0029] In another preferred embodiment, the underground gas storage pile includes a pile body, an internal pipe, a bottom sealing body, and a top sealing cover. The bottom sealing body, the top sealing cover, and the pile body together define a sealed space. The internal pipe is disposed within the sealed space and is used to store ambient temperature high-pressure compressed air.

[0030] In another preferred embodiment, the built-in tube is tightly attached to the inner wall of the pile body.

[0031] In another preferred embodiment, the pile body is composed of one or more segmented pile bodies, with adjacent segmented pile bodies connected by end plates.

[0032] In another preferred embodiment, a grouting conduit is pre-embedded in the pile body, the bottom of the grouting conduit is provided with a grout outlet, and the top of the grouting conduit is provided with a grouting port.

[0033] In another preferred embodiment, the diameter of the built-in tube is greater than 800 mm.

[0034] In another preferred embodiment, an integrated pressure-temperature-displacement fiber optic grating sensor is installed at the top of the pile to monitor the micro-displacement of the pile head and the internal air pressure.

[0035] In another preferred embodiment, the system further includes an air input pipe and an air output pipe, wherein a first pressure gauge and a first pressure sensor are provided on the air input pipe for measuring the pressure of compressed air entering the underground gas storage pile; and / or a second pressure gauge and a second pressure sensor are provided on the air output pipe for measuring the pressure of compressed air released from the underground gas storage pile.

[0036] In another preferred embodiment, the air input pipeline includes a main air input pipeline and branch air input pipelines, the branch air input pipelines being connected to the air inlets of the underground gas storage piles respectively.

[0037] In another preferred embodiment, the air output duct includes a main air output duct and branch air output ducts, the branch air output ducts being respectively connected to the air outlets of the underground gas storage pile.

[0038] In another preferred embodiment, the underground gas storage pile energy storage unit further includes a safety valve for controlling the opening and closing of the air input pipe and air output pipe of each underground gas storage pile, and the safety valve is installed on the branch air input pipe and branch output pipe.

[0039] The second aspect of this application also provides a method for multi-energy synergistic utilization of a compressed air energy storage pile foundation system for road and bridge construction, comprising the following steps:

[0040] (a) Compressed energy storage: When the grid is in a low-voltage period or when renewable energy output is sufficient, compressed air is stored in the underground compressed air storage pile unit using a compression purification unit.

[0041] (b) Waste heat recovery: During the compression process, the waste heat generated is recovered and transported to the heat exchange unit for storage;

[0042] (c) Expansion power generation: During peak grid periods or when energy demand is high, the stored high-pressure air is released to the filter expansion unit to generate electricity through expansion, and a reheater is used for secondary heating to improve efficiency.

[0043] (d) Heat utilization: The heat stored in the heat exchange unit is used to carry out de-icing and snow melting on the road and bridge surface and frost heave protection of the soil around the piles through the road and bridge surface heat transport unit.

[0044] It should be understood that, within the scope of this application, the above-described technical features of this application and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described in detail here. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. It should be understood that the accompanying drawings described below are merely some implementation examples of this application, and those skilled in the art can obtain other implementation examples based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of a compressed air energy storage pile foundation system for road and bridge construction according to this application;

[0047] Figure 2 This is a schematic diagram of a partial compressed air energy storage pile foundation system for road and bridge construction, based on this application.

[0048] Figure 3 This is a structural schematic diagram of a single pile foundation of an underground gas storage pile energy storage unit according to this application;

[0049] Figure 4 This is a schematic diagram of the cross-sectional structure of a single pile foundation of an underground gas storage pile energy storage unit according to this application;

[0050] Figure 5 This is a structural schematic diagram of the road surface heat exchange system according to this application.

[0051] In each of the attached figures, the markings are as follows:

[0052] 1-Underground gas storage pile

[0053] 102-Bottom Seal

[0054] 103-Slurry outlet

[0055] 105-Grouting Port

[0056] 106-Grouting pipe

[0057] 110-Top Sealing Cap

[0058] 111-pile body

[0059] 112-Energy Storage Pile Cap

[0060] 113-Internal tube

[0061] 114-End Plate

[0062] 117-Pin

[0063] 1151 - First Safety Valve

[0064] 1152 - Second Safety Valve

[0065] 1161-Branch Air Inlet Pipe

[0066] 1162-Branch Air Output Pipe

[0067] 2-Electric motor

[0068] 3-Compression Purification Unit

[0069] 301-First Compressor

[0070] 302-Cooler

[0071] 4-Filter Expansion Unit

[0072] 401-Turbine Expander

[0073] 402-Reheater

[0074] 5-Generator

[0075] 6-Heat Exchange Unit

[0076] 601-Second Compressor

[0077] 602-Condenser

[0078] 603-Expansion Valve

[0079] 604-Evaporator

[0080] 7-Valve System

[0081] 8-Integrated Control Unit

[0082] 9-Road surface heat exchange system

[0083] 108 - Heat transfer medium transport pipeline

[0084] 302-Circulation Pump

[0085] 2011-Pressure relief pipe

[0086] 501 - Thermal Conductive Material

[0087] 502 - Thermal Insulation Material

[0088] 503-Heat Exchanger Tube Detailed Implementation

[0089] Through extensive and in-depth research, the applicant has developed for the first time a compressed air energy storage pile foundation system for roads and bridges. This system uses large-diameter, non-displacement, high-bearing-capacity pipe piles with anti-corrosion properties on the inner wall as the pile foundation for storing compressed gas. The power source can utilize surplus electricity during off-peak hours of the power grid or green energy sources such as photovoltaic and wind turbines laid along the transportation route to drive the compressed air compressor, which stores the compressed air in the pipe pile system of the bridge. During peak hours of the power grid, the compressed air is released to drive the engine to generate electricity. The compressed air stored in the pile foundation system is used as an energy source to exchange heat with the road (bridge) surface through a heat exchange unit to meet the heating and cooling needs of the road (bridge) surface.

[0090] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0091] This application has at least one of the following advantages:

[0092] (a) The compressed air energy storage pile foundation system for road and bridge in this application is a typical technical solution for the integration of "energy network" and "transportation network". It not only solves the space limitation on energy storage system, but also realizes combined cooling, heating and power through underground pipe pile system energy storage, with significant comprehensive benefits in terms of energy consumption and economy.

[0093] (b) The compressed air energy storage pile foundation system for road and bridge in this application rapidly releases heat energy through underground heat transfer pipes (heat exchange pipe 503), melting ice and snow in a short time. It is more efficient than traditional de-icing methods, while reducing damage to the road / bridge structure and pollution to the surrounding soil and water, and extending the service life of the road and bridge.

[0094] (c) The compressed air energy storage pile foundation system for road and bridge in this application can flexibly increase or decrease the number of energy storage piles according to the scale of the road and bridge to adapt to different scenario needs;

[0095] (d) The compressed air energy storage pile foundation system for road and bridge construction of this application has high flexibility and adaptability. Its construction and installation methods can be adjusted according to different building needs and geological conditions, and it is suitable for a variety of building types and application scenarios.

[0096] (f) The compressed air energy storage pile foundation system for road and bridge construction of this application significantly improves the system's operating efficiency and reliability by optimizing the connection and collaborative work of each component. For example, by setting up multi-stage filters and air dryers, impurities and moisture in the compressed air are effectively removed, extending the service life of the equipment. At the same time, the system adopts a modular design, which facilitates installation, maintenance and upgrades, further reducing the system's operating costs.

[0097] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that these are merely examples provided to the reader of possible approaches in this application, and are not intended to limit the scope of this application.

[0098] See Figure 1-5 This application provides a compressed air energy storage pile foundation system for road and bridge use, including: an underground gas storage pile energy storage unit, an electric motor 2, a compression and purification unit 3, a filtration and expansion unit 4, a generator 5, a heat exchange unit 6, a valve system 7, an integrated control unit 8 (optionally), a road surface heat exchange system 9, a heat transfer medium transportation unit, and an air input pipeline (including a main air input pipeline and a branch air input pipeline 1161) and an air output pipeline (including a main air output pipeline and a branch air output pipeline 1162).

[0099] The compression purification unit 3 is configured to compress and cool air to obtain room temperature high-pressure compressed air; the underground gas storage pile energy storage unit includes one or more underground gas storage piles 1, which are used to store the room temperature high-pressure compressed air discharged by the compression purification unit 3; the filter expansion unit 4 is configured to expand the room temperature high-pressure compressed air stored in the underground gas storage pile 1; the heat exchange unit 6 includes a heat collector, which is used to recover the heat generated during the air compression process and provide the heat to the road surface heat exchange system 9, which is configured to perform road surface de-icing by receiving the heat.

[0100] An air input pipe (inlet pipe) connects the compression purification unit 3 and the underground gas storage pile 1. A first safety valve 1151 is installed on a branch air input pipe 1161 of the air input pipe. An air output pipe (outlet pipe) connects the underground gas storage pile 1 and the filter expansion unit 4. A second safety valve 1152 is installed on a branch air output pipe 1162 of the air output pipe (outlet pipe). Preferably, a first pressure gauge and a first pressure sensor (not shown in the figure) are installed on the air input pipe to measure the pressure of the compressed air entering the underground gas storage pile. Preferably, a second pressure gauge and a second pressure sensor (not shown in the figure) are installed on the air output pipe to measure the pressure of the compressed air released from the underground gas storage pile 1.

[0101] In one embodiment, the underground gas storage pile 1 is a large-diameter hollow pipe pile capable of storing compressed gas; the motor 2 operates on off-peak mains power or photovoltaic / wind power, driving the compression and purification unit 3. Preferably, the underground gas storage pile 1 consists of a pile body 111, an internal pipe 113, a bottom sealing body 102, and a top sealing cap 110. In one embodiment, a grouting conduit 106 is pre-embedded in the inner wall of the pile body 111, a grout outlet 103 is provided at the bottom, and a grouting port 105 is provided at the top of the pile wall, welded together with an end plate 114. Preferably, the diameter of the internal pipe 113 can be greater than 800 mm, and the inner wall has high pressure resistance and corrosion resistance, capable of withstanding medium-pressure air of about 8 MPa. The bottom sealing body 102 is placed on the energy storage pile foundation 112.

[0102] The top sealing cap 110 is pressure-resistant and corrosion-resistant, and has at least three holes through which the air input pipe (inlet pipe) 1161, the air output pipe (outlet pipe) 1162, and the pressure relief pipe 2011 pass. The pressure relief pipe 2011 controls the gas discharge from the underground gas storage pile 1 through the pressure relief valve 2012. In one embodiment, the top sealing cap 110 is fixed by a pin 117.

[0103] In one embodiment, the underground gas storage pile energy storage unit is a hollow or multi-cavity concrete-steel composite pile embedded under a bridge or road. The inner wall of the pile is provided with a prestressed metal liner 113. The liner is integrally anchored with the pile bottom end cap 102 and the pile top end cap 110. The three together define a sealed high-pressure gas storage chamber (i.e., used to store room temperature high-pressure compressed air), allowing a working pressure of 5 to 15 MPa without reducing the bearing capacity of the pile foundation. The prestressed metal liner 113 is made of 10° to 45° spirally wound steel strip or glass fiber reinforced plastic composite strip, and is poured synchronously with the pile concrete to form an integral whole.

[0104] Optionally, the compression purification unit 3 includes at least two low-pressure compressors, a first filter, a cooler, and a first air dryer. The compressor unit is driven by an electric motor 2 to compress ambient temperature and pressure air in multiple stages. The filter removes impurities such as oil, dust, and particulate matter from the air. The cooler cools the gas discharged from the compressor, causing moisture in the gas to condense, thus achieving preliminary separation of moisture from the compressed gas. The first filter and the first air dryer are used to dry and filter the moisture in the compressed air. Finally, the filtered and dried compressed gas is stored in an underground gas storage pile 1. Preferably, the electric motor 2 is powered by mains electricity, photovoltaic power, or wind power. Preferably, surplus electricity during off-peak periods drives the electric motor, which in turn drives the compressor unit. Preferably, the number of first filters is one or more. Preferably, the cooler of the compression purification unit 3 is connected to the heat collector of the heat exchange unit 6. The heat released by the cooler is collected by the heat collector. The heat collected by the heat collector provides the heat required for snow removal on the road (bridge) surface and the heat required for the reheater in the filter expansion unit 4. It can also be connected to the user to provide the user with the heat required.

[0105] Optionally, the filtration and expansion unit 4 includes a second filter, a third air dryer, a reheater, and at least two turbine expanders, etc., to release energy by expanding the compressed gas in the underground gas storage pile 1 through multiple stages, thereby driving the generator 5 to generate electricity. Preferably, the second filter and the second air dryer are located upstream of the reheater to filter and dry the high-pressure compressed air discharged from the underground gas storage pile 1. The generator 5 is connected to the turbine expanders of the filtration and expansion unit 4. The high-temperature, high-pressure air heated by the reheater enters the turbine expanders to expand and do work, driving the generator 5 to convert mechanical energy into electrical energy, providing electricity to the user end. Preferably, the reheater of the filtration and expansion unit 4 is connected to the heat collector in the heat exchange unit 6, and the heat collector 6 transfers heat to the reheater to increase the operating temperature of the reheater. That is, the reheater heats the air coming out of the outlet pipe of the underground gas storage pile 1 to supplement the working heat required by the turbine expander.

[0106] Optionally, the heat exchange unit 6 also includes a second compressor 601, a condenser 602, an expansion valve 603, an evaporator 604, and a piping system. The heat exchange unit 6 relies on the compressor to drive the refrigerant circulation and achieves heat exchange through the condenser / evaporator, belonging to active thermal management. Specifically, the second compressor 601 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas, inputting energy to drive the circulation; the high-temperature, high-pressure refrigerant releases heat through the condenser 602, achieving a phase change heat transfer from gaseous to liquid state; the collector collects the heat released by the condenser 602; the expansion valve 603 throttles and reduces pressure, controlling the refrigerant flow to form a low-temperature, low-pressure two-phase flow; the low-temperature, low-pressure refrigerant absorbs heat through the evaporator 604, achieving a phase change heat transfer from liquid to gaseous state; the piping system connects the various components to ensure refrigerant circulation, including auxiliary components such as a receiver and a dryer filter. Optionally, the evaporator 604 in the heat exchange unit 6 is connected to the cooler in the compression and purification unit 3. After the evaporator 604 cools down, it can reduce the temperature of the cooler, thereby improving the system's working efficiency.

[0107] Optionally, the heat transfer medium delivery unit consists of a heat transfer medium delivery pipeline 108 and a circulating pump; the circulating pump drives the heat transfer medium to flow in a closed loop to ensure that heat is efficiently transferred from the heat source to the heat-using equipment; in addition, the heat transfer efficiency is ensured by adjusting the flow rate of the heat transfer medium.

[0108] Optionally, the integrated control unit 8 consists of software systems, sensors, controllers, and instruments, which can monitor the working status of the underground gas storage pile system and exchange heat with the road (bridge) surface heat exchange system through the heat exchange unit 6.

[0109] In one embodiment, the road surface heat exchange system 9 comprises a heat exchange pipe 503 laid under the road surface, a temperature-stress sensor, a thermally conductive material 501 in contact with the upper surface of the heat exchange pipe 503, and a thermal insulation material 502 in contact with the lower surface of the heat exchange pipe 503. In the road surface heat exchange system 9, the heat exchange pipe 503 laid under the road surface is surrounded by a shaped phase change thermal storage material. The thermally conductive material 501 in contact with the upper surface of the heat exchange pipe includes a cementitious material containing calcium carbonate, or a solidified body formed by microbially induced calcium carbonate precipitation. The thermal insulation material 502 includes a cementitious material obtained from solid waste containing silicon and aluminum under activating conditions.

[0110] In one embodiment, the road surface heat exchange system 9 includes: a heat exchange pipe 503, laid in a serpentine pattern 50-100mm below the concrete layer of the road / bridge surface; a thermally conductive material 501 covering the upper surface of the heat exchange pipe 503, with a thermal conductivity ≥3W / m·K; and a thermal insulation material 502 disposed on the lower surface of the heat exchange pipe 503, with a thermal resistance ≥1.5 (m). 2 •K) / W, to prevent heat from being lost underground.

[0111] Optionally, this application also provides a method for multi-energy synergistic utilization of a compressed air energy storage pile foundation system for road and bridge construction, comprising the following steps:

[0112] (a) Compressed energy storage: When the grid is in a low-voltage period or when renewable energy output is sufficient, compressed air is stored in the underground compressed air storage pile unit using a compression purification unit.

[0113] (b) Waste heat recovery: During the compression process, the waste heat generated is recovered and transported to the heat exchange unit for storage;

[0114] (c) Expansion power generation: During peak grid periods or when energy demand is high, the stored high-pressure air is released to the filter expansion unit to generate electricity through expansion, and a reheater is used for secondary heating to improve efficiency.

[0115] (d) Heat utilization: The heat stored in the heat exchange unit is used to carry out de-icing and snow melting on the road and bridge surface and frost heave protection of the soil around the piles through the road and bridge surface heat transport unit.

[0116] Optionally, this application also provides a method for constructing and installing a compressed air energy storage pile foundation system for roads and bridges, including the following steps:

[0117] Step S1. Manufacturing of precast pipe piles;

[0118] Step S2. Drilling and pile driving;

[0119] Step S3. Splicing the piles;

[0120] Step S4. Repeat steps S2 and S3 until the pile length reaches the design length or the pile tip is effectively embedded in the design stratum;

[0121] Step S5. Dredging and sealing the bottom;

[0122] Step S6. Repeat steps S1 to S5 until all pile foundation construction is completed;

[0123] Step S7. Sealing test and pile inspection;

[0124] Step S8. Install the top sealing cap 110;

[0125] Step S9. Install the air input duct (inlet pipe) 1161 and the compression purification unit 3;

[0126] Step S10. Install the air output duct (outlet pipe) 1162 and the filter expansion unit 4;

[0127] Step S11. Install motor 2 and generator 5;

[0128] Step S12. Construction of the road surface heat exchange system;

[0129] Step S13. Connect each device to the integrated management and control unit 8;

[0130] Step S14. Debugging;

[0131] Step S15. Run.

[0132] In one embodiment, the manufacturing of precast pipe piles in step S1 includes: pre-embedding grouting pipes in the pipe wall of the pipe pile during the precasting process in the factory; and applying an anti-corrosion coating to the inner wall of the pipe pile for anti-corrosion treatment.

[0133] The grouting pipe includes an aluminum-plastic pipe with an inner diameter of 20 mm and a wall thickness of 4 mm.

[0134] In one embodiment, step S2, drilling-pile driving, includes: connecting an expandable-retractable drill bit to a long spiral drill rod and then entering the stratum to be driven through the inner cavity of a large-diameter pipe pile; driving the drill rod to drill, the spiral blades of the drill bit continuously squeezing the soil around the pile hole, so that the diameter of the pile hole gradually expands until the hole diameter is larger than the outer diameter of the pipe pile, ensuring that the pipe pile sinks synchronously with the drill bit under the action of zero pile driving resistance or small pile driving resistance; the residual soil generated by drilling is carried out to the ground through the spiral blades on the long spiral drill rod inside the pipe pile cavity.

[0135] In one embodiment, in step S3, the pile splicing includes: the upper and lower sections of the pipe pile are connected by welding (argon arc welding for the root pass + electric welding for the cover pass), the grouting pipe between the upper and lower sections of the pipe pile is connected by a high-strength aluminum-plastic pipe, and a sealing ring is added between the grouting pipe and the high-strength aluminum-plastic pipe for sealing.

[0136] In one embodiment, in step S4, after repeating steps S2 and S3 until the pile length reaches the design length or the pile tip is effectively embedded in the design stratum, the process further includes: grouting the pile side through a grouting pipe pre-embedded in the wall of the pipe pile.

[0137] In one embodiment, step S5, dredging and sealing the bottom, includes: after clearing the slag at the bottom of the hole, pouring concrete into the bottom of the hole through a pipe.

[0138] In one embodiment, in step S8, installing the top sealing cover 110 includes: placing the top sealing cover 110 on top of the pipe pile and sealing the contact area between the top sealing cover 110 and the pipe pile.

[0139] In one embodiment, in step S9, the air input pipe (inlet pipe) and the compression and purification unit 3 include: passing the air inlet end of the air input pipe (inlet pipe) through a pre-reserved hole in the top sealing cover 110 and sealing the hole in the cover plate; connecting the air input pipe (inlet pipe) to the compression and purification unit 3 (compressor (unit), cooler, first filter, first air dryer, first pressure gauge and first pressure sensor, etc.) at the other end; in addition, the heat generated by the compression and purification unit 3 is connected to the heat exchange unit 6 through the valve system and the heat transfer medium conveying pipe 108, and then returned to the compression and purification unit 3 as cold air through the valve system.

[0140] In one embodiment, step S10, installing the air output pipe (outlet pipe) and the filter expansion unit 4, includes: passing the air outlet end of the air output pipe (outlet pipe) through a pre-reserved hole in the top sealing cover 110 and sealing the hole; connecting the air output pipe (outlet pipe) to the filter expansion unit 4 (turbo expander (unit), reheater, second filter, second air dryer, second pressure gauge, second pressure sensor, etc.) at the other end; in addition, the heat exchange unit 6 connects the heat to the filter expansion unit 4 through the heat transfer medium conveying pipe 108 via a valve system.

[0141] In one embodiment, in step S11, installing the motor 2 and the generator 5 includes: connecting the inlet of the motor 2 to mains power or photovoltaic / wind power, and connecting the outlet of the motor to the compression and purification unit 3 through the first clutch A1; and connecting the outlet of the filter expansion unit 4 to the inlet of the generator 5 through the second clutch A2.

[0142] In one embodiment, the construction of the road surface heat exchange system in step S12 includes: first laying thermal insulation material 502, then installing heat exchange pipes, and finally laying thermally conductive material 501. The road surface heat exchange system is connected to the heat exchange unit 6.

[0143] It should be noted that in this patent application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0144] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A compressed air energy storage pile foundation system for road and bridge construction, characterized in that, include: The underground gas storage pile energy storage unit, compression and purification unit (3), filtration and expansion unit (4), heat exchange unit (6) and road surface heat exchange system (9); The compression purification unit (3) is configured to compress and cool the air to obtain room temperature high pressure compressed air; The underground gas storage pile energy storage unit includes one or more underground gas storage piles (1), which are used to store the ambient temperature high pressure compressed air discharged by the compression purification unit (3). The filter expansion unit (4) is configured to expand the ambient temperature high pressure compressed air stored in the underground gas storage pile (1); The heat exchange unit (6) includes a heat collector for recovering heat generated during air compression and providing the heat to the road surface heat exchange system (9), which is configured to de-ice the road surface by receiving the heat.

2. The system as described in claim 1, characterized in that, The compression purification unit (3) includes a first compressor unit and a cooler. The first compressor unit is configured to compress air, and the cooler is connected to the first compressor unit and cools the high-temperature and high-pressure compressed air discharged by the first compressor unit, thereby obtaining normal-temperature and high-pressure compressed air.

3. The system as described in claim 2, characterized in that, The heat collector is connected to the cooler and is used to recover the heat generated during the air compression process.

4. The system as described in claim 2, characterized in that, The compression purification unit (3) also includes a first filter and a first air dryer located on the air input pipe downstream of the cooler. The first filter is used to filter oil, dust and particulate matter in the compressed air, and the first air dryer is used to separate moisture in the compressed air.

5. The system as described in claim 1, characterized in that, The system also includes a generator (5), and the filter expansion unit (4) includes a reheater and a turbine expander. The turbine expander is configured to expand the ambient temperature high pressure compressed air released by the underground gas storage pile during the peak period of the power grid load to drive the generator (5) to generate electricity. The reheater is connected to the heat collector and is used to reheat the ambient temperature high pressure compressed air before it expands.

6. The system as described in claim 1, characterized in that, The road surface heat exchange system (9) includes a heat exchange pipe (503) laid under the road surface, a thermally conductive material (501) in contact with the upper surface of the heat exchange pipe (503), and a thermal insulation material (502) in contact with the lower surface of the heat exchange pipe (503). The heat exchange pipe (503) is connected to the solar collector, thereby transferring the heat from the solar collector to the heat exchange pipe (503), and then transferring the heat in the heat exchange pipe (503) to the road surface or bridge surface through the thermally conductive material (501).

7. The system as described in claim 1, characterized in that, The heat exchange unit (6) also includes a second compressor (601), a condenser (602), an expansion valve (603), and an evaporator (604). The heat collector is also connected to the condenser (602) for collecting the heat released by the condenser (602).

8. The system as described in claim 1, characterized in that, The underground gas storage pile (1) includes a pile body (111), an internal pipe (113), a bottom sealing body (102), and a top sealing cover (110). The bottom sealing body (102), the top sealing cover (110), and the pile body (111) together define a sealed space. The internal pipe (113) is disposed in the sealed space and is used to store room temperature high pressure compressed air.

9. The system as described in claim 8, characterized in that, The pile body (111) is pre-embedded with a grouting conduit (106), the bottom of the grouting conduit (106) is provided with a grout outlet (103), and the top of the grouting conduit (106) is provided with a grouting outlet (105).

10. The system as claimed in claim 1, characterized in that, The system further includes an air input pipe and an air output pipe, wherein a first pressure gauge and a first pressure sensor are provided on the air input pipe, the first pressure gauge and the first pressure sensor being used to measure the pressure of compressed air entering the underground gas storage pile (1); and / or a second pressure gauge and a second pressure sensor are provided on the air output pipe, the second pressure gauge and the second pressure sensor being used to measure the pressure of compressed air released from the underground gas storage pile (1).

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