Insulation material, heat collection bag, device and method for solidifying blown-fill calcareous sand foundation

Abstract

The present invention discloses a thermal insulation material, a heat collection bag, a device and a method for curing a blown-fill calcareous sand foundation, and belongs to the technical field of civil engineering geological treatment. The thermal insulation material includes a heat absorption layer, a heat insulation layer and a fabric layer, and the heat absorption layer, the heat insulation layer and the fabric layer are fixedly compounded from top to bottom. The solar heat collection bag includes a transparent heat-permeable part and the thermal insulation material, the edge of the transparent heat-permeable part is a first edge, and the edge of the thermal insulation material is a second edge; the transparent heat-permeable part and the thermal insulation material are compounded into one through the first edge and the second edge, and a containing space is formed between the transparent heat-permeable part and the thermal insulation material, so that the medium contained in the containing space can be heated by solar energy. The device includes a water intake component, the solar heat collection bag, and a water injection component. The method is implemented based on the device. The device and method can significantly improve the overall strength, anti-liquefaction performance and seepage characteristics of the calcareous sand foundation, and the cost is low and has a very high application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering geological treatment, and in particular to a device and method for a heat-insulating material, a heat-collecting bag, and a solidified blown-fill calcareous sand foundation. Background Art

[0002] Calcareous sand is a special geological material formed by the remains of reef-building and reef-attached organisms such as reef-building corals, algae and shells through sedimentation and weathering, and is widely distributed in tropical and subtropical shallow seas. The main chemical component of calcareous sand is calcium carbonate, and its content can usually reach 90%. Especially in coral islands and reefs far away from the mainland, calcareous sand is the most economical and environmentally friendly engineering construction material, and is widely used as dredged fill foundation and concrete aggregate. However, in real life, calcareous sand has a low safety factor in pile foundation engineering, which can easily cause serious economic losses. Summary of the invention

[0003] In view of this, the present invention provides a thermal insulation material, a solar collecting bag, a device and a method for solidifying a blown-filled calcareous sand foundation. The thermal insulation material can be used to make the solar collecting bag, and the device for solidifying a blown-filled calcareous sand foundation can be used to make the solar collecting bag. Based on the device and method for solidifying a blown-filled calcareous sand foundation, seawater can be heated by solar energy through the solar collecting bag and injected into a loose calcareous sand formation, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitates in the pores of the calcareous sand formation, which can significantly improve the overall strength, liquefaction resistance and seepage characteristics of the calcareous sand foundation, and will not introduce any possible pollutants into the marine environment, consumes less energy, and is therefore more suitable for practical use.

[0004] In order to achieve the above first purpose, the technical solution of the thermal insulation material provided by the present invention is as follows:

[0005] The thermal insulation material provided by the present invention comprises a heat absorbing layer (18), a heat insulating layer (19) and a fabric layer (20).

[0006] The heat absorbing layer (18), the heat insulating layer (19) and the fabric layer (20) are fixedly compounded into one body from top to bottom.

[0007] The thermal insulation material provided by the present invention can also be further implemented by adopting the following technical measures.

[0008] Preferably, the heat absorbing layer (18) is made of black polymer.

[0009] Preferably, the heat insulation layer (18) is made of an aluminum-based reflective thermal insulation material.

[0010] Preferably, the fabric layer (20) is made of wear-resistant fabric.

[0011] Preferably, the fixing and bonding comprises one or a combination of several methods including suturing, gluing and compacting.

[0012] In order to achieve the above second purpose, the technical solution of the heat collecting bag provided by the present invention is as follows:

[0013] The solar heat collection bag provided by the present invention comprises a transparent heat-transmitting portion (17) and the heat-insulating material provided by the present invention.

[0014] The edge of the transparent heat-transmitting portion (17) is a first edge, and the edge of the heat-insulating material is a second edge;

[0015] The transparent heat-permeable portion (17) and the heat-insulating material are combined into one body through the first edge and the second edge, and a containing space is formed between the transparent heat-permeable portion (17) and the heat-insulating material, so that the medium contained in the containing space can be heated by solar energy.

[0016] The heat collecting bag provided by the present invention can also be further implemented by adopting the following technical measures.

[0017] Preferably, the transparent heat-transmitting portion (17) is made of ethylene-tetrafluoroethylene copolymer material.

[0018] Preferably, the solar heat collecting bag further includes an inlet pipeline and an outlet pipeline.

[0019] The inlet pipeline is connected to one end of the solar heat collecting bag, and the outlet pipeline is connected to the other end of the solar heat collecting bag, so that the accommodating space is connected to the outside through the inlet pipeline and the outlet pipeline.

[0020] Preferably, the solar heat collecting bag further comprises a pressure relief valve (8).

[0021] The pressure relief valve (8) is arranged on the solar heat collecting bag, so that the excess pressure in the accommodating space can be relieved through the pressure relief valve (8).

[0022] In order to achieve the third object, the technical solution of the device for solidifying the blown-fill calcareous sand foundation provided by the present invention is as follows:

[0023] The device for solidifying the blown-fill calcareous sand foundation provided by the present invention comprises a water intake component, a solar heat collection bag (9) provided by the present invention, and a water injection component.

[0024] The water intake component is in communication with the accommodation space of the solar heat collection bag (9), so that the seawater obtained by the water intake component can be input into the accommodation space of the solar heat collection bag (9);

[0025] The solar heat collection bag (9) utilizes solar energy to heat the seawater input into the solar heat collection bag (9) to obtain heated seawater;

[0026] The water injection assembly is in communication with the accommodating space of the solar thermal collector bag (9), and the heated seawater can be injected into the loose calcareous sand formation through the water injection assembly, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation.

[0027] The device for solidifying blown-fill calcareous sand foundation provided by the present invention can be further implemented by adopting the following technical measures.

[0028] Preferably, the water intake assembly comprises a filter screen (4), an impeller assembly (3), a water lift pipe (2) and a water delivery pipe (5).

[0029] The filter screen (4) is fixedly arranged at the water inlet end of the impeller group (3), the water inlet end of the water pumping pipe (2) is fixedly connected to the water outlet end of the impeller group (3), the water outlet end of the water pumping pipe (2) is fixedly connected to the water inlet end of the water delivery pipe (5), and the water outlet end of the water delivery pipe (5) is fixedly connected to the inlet pipeline of the solar heat collection bag (9), so that seawater can enter the accommodating space of the solar heat collection bag (9) after passing through the filter screen (4), the impeller group (3), the water pumping pipe (2) and the water delivery pipe (5) in sequence.

[0030] Preferably, the device for solidifying the calcareous sand foundation further comprises a coupling (1).

[0031] The water outlet diameter of the water lift pipe (2) is smaller than the water inlet diameter of the water delivery pipe (5).

[0032] The coupling (1) comprises a first port and a second port, wherein the diameter of the first port is equal to the diameter of the water outlet end of the water lift pipe (2), and the diameter of the second port is equal to the diameter of the water inlet end of the water delivery pipe (5).

[0033] The coupling (1) is fixedly connected to the water outlet end of the water lift pipe (2) via the first port, and the coupling (1) is fixedly connected to the water inlet end of the water delivery pipe (5) via the second port.

[0034] Preferably, the device for solidifying the calcareous sand foundation further comprises a pressure regulating valve (6).

[0035] The pressure regulating valve (6) is arranged on the water delivery pipe (5), and the pressure regulating valve (6) is used to adjust the water flow in the water delivery pipe (5).

[0036] Preferably, the device for solidifying the blown-fill calcareous sand foundation further comprises a connecting piece.

[0037] The solar heat collecting bag (9) comprises a plurality of:

[0038] The plurality of solar heat collecting bags (9) are connected in series and / or in parallel, wherein the plurality of solar heat collecting bags (9) connected in series are connected via the connecting piece.

[0039] Preferably, the connecting piece is a flexible water pipe.

[0040] One end of the flexible water pipe is connected between two adjacent solar heat collecting bags (9), so that in the two adjacent solar heat collecting bags (9), the outlet pipe of the front solar heat collecting bag (9) passes through the flexible water pipe and is connected to the inlet pipe of the rear solar heat collecting bag (9).

[0041] Preferably, the device for solidifying the blown-fill calcareous sand foundation further comprises a connecting piece.

[0042] The plurality of solar heat collecting bags (9) connected in series are also connected together via the connecting piece.

[0043] Preferably, the water injection assembly comprises a water injection pipeline and a water injection piece.

[0044] The water inlet end of the water injection pipe is fixedly connected to the outlet pipeline of the solar heat collecting bag (9), and the water outlet end of the water delivery pipe is fixedly connected to the water injection piece, so that the seawater heated by solar energy in the accommodating space of the solar heat collecting bag (9) passes through the water injection pipe and the water injection piece in sequence, and is then injected into the loose calcareous sand formation, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

[0045] Preferably, the water injection member comprises a plurality of:

[0046] The water injection member comprises a pipe cap (13) and an end pipe (16), wherein the pipe cap is disposed on one end of the end pipe (16), and the other end of the end pipe (16) has a tapered end.

[0047] The water injection pipeline is provided with a plurality of branches, the number of the branches is the same as the number of the water injection pieces, so that the branches correspond to the water injection pieces one by one.

[0048] The seawater passing through the water injection pipeline passes through the branch and the end pipe in sequence, and is then injected into the loose calcareous sand formation from the tapered end of the end pipe, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation.

[0049] Preferably, the device for solidifying the calcareous sand foundation further comprises an extension pipe (14) and a threaded joint (15).

[0050] The threaded joint (15) is hollow.

[0051] The extension tube (14) is arranged between the tube cap (13) and the end tube (16), so that the tube cap (13) is connected and communicated with the end tube (16) by means of the threaded joint (15).

[0052] Preferably, a plurality of through holes are provided on the tube walls of the extension tube (14) and the end tube (16).

[0053] Preferably, the device for solidifying the calcareous sand foundation further comprises a booster pump (11).

[0054] The booster pump (11) is arranged on the water injection pipeline, so that the flow rate and flow rate of seawater output through the water injection pipeline are increased on the original basis.

[0055] In order to achieve the fourth objective, the technical solution of the method for solidifying the calcareous sand foundation provided by the present invention is as follows:

[0056] The method for solidifying the blown-filled calcareous sand foundation provided by the present invention is realized based on the device for solidifying the blown-filled calcareous sand foundation provided by the present invention. The method for solidifying the blown-filled calcareous sand foundation comprises the following steps:

[0057] Normal temperature seawater with a temperature of 15°C to 25°C passes through the water intake assembly and enters the accommodation space of the solar heat collection bag (9);

[0058] The seawater in the accommodation space of the solar heat collecting bag (9) is heated by solar energy to form high-temperature seawater with a temperature of 50° C. to 70° C.;

[0059] The high-temperature seawater is injected into the loose calcareous sand formation through the water injection assembly, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

[0060] The thermal insulation material provided by the embodiment of the present invention includes a heat absorption layer 18, a heat insulation layer 19 and a fabric layer 20, wherein the heat absorption layer 18 can absorb heat; the heat insulation layer 19 can reduce heat loss; and the fabric layer 20 can enhance the toughness of the thermal insulation material itself and extend its service life.

[0061] The transparent heat-permeable portion 17 of the solar thermal collection bag provided in the embodiment of the present invention is combined into one by its first edge and the second edge of the thermal insulation material. When used, the transparent heat-permeable portion 17 is arranged to face the sun, and the thermal insulation material is on the bottom side of the transparent heat-permeable portion 17. In this case, the transparent heat-permeable portion 17 and the thermal insulation material complement each other, so that the solar radiation heat can enter the accommodating space formed between the transparent heat-permeable portion 17 and the thermal insulation material. When the accommodating space contains a medium to be heated, the medium to be heated can be heated by the solar radiation heat.

[0062] The device for solidifying the blown-fill calcareous sand foundation provided by an embodiment of the present invention comprises a water intake component, the solar energy collecting bag 9 provided by the present invention, and a water injection component, wherein normal temperature seawater can be input into the accommodating space of the solar energy collecting bag 9 via the water intake component, and under the action of solar energy radiation heat, the normal temperature seawater is heated to become heated seawater, and finally, through the water injection component, the heated seawater can be injected into the loose calcareous sand formation, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation, thereby being able to improve the overall strength, anti-liquefaction performance and seepage characteristics of the calcareous sand foundation, and having extremely high utilization value and economic and ecological advantages.

[0063] The method for solidifying a blown-filled calcareous sand foundation provided by an embodiment of the present invention is realized based on an apparatus for solidifying a blown-filled calcareous sand foundation provided by an embodiment of the present invention. Normal temperature seawater with a temperature of 15°C-25°C passes through a water intake component of the apparatus for solidifying a blown-filled calcareous sand foundation and enters the accommodating space of a solar energy collecting bag of the apparatus for solidifying a blown-filled calcareous sand foundation; the seawater in the accommodating space of a solar energy collecting bag of the apparatus for solidifying a blown-filled calcareous sand foundation is heated by solar energy to form high temperature seawater with a temperature of 50°C-70°C; the high temperature seawater is injected into a loose calcareous sand formation through a water injection component of the apparatus for solidifying a blown-filled calcareous sand foundation, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation, which has extremely high utilization value and economic and ecological advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0065] Figure 1 A schematic diagram of the overall structure of a device for solidifying a blown-fill calcareous sand foundation provided by an embodiment of the present invention;

[0066] Figure 2A schematic cross-sectional view of a heat collecting bag provided in an embodiment of the present invention;

[0067] Figure 3 A flow chart of the steps of a method for solidifying a calcareous sand foundation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In view of this, the present invention provides a thermal insulation material, a solar collecting bag, a device and a method for solidifying a blown-filled calcareous sand foundation. The thermal insulation material can be used to make the solar collecting bag, and the device for solidifying a blown-filled calcareous sand foundation can be used to make the solar collecting bag. Based on the device and method for solidifying a blown-filled calcareous sand foundation, seawater can be heated by solar energy through the solar collecting bag and injected into a loose calcareous sand formation, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitates in the pores of the calcareous sand formation, which can significantly improve the overall strength, liquefaction resistance and seepage characteristics of the calcareous sand foundation, and will not introduce any possible pollutants into the marine environment, consumes less energy, and is therefore more suitable for practical use.

[0069] After arduous efforts, the inventor discovered that

[0070] The difference in the solubility of calcium carbonate at different temperatures is achieved by controlling the changes in the temperature, pressure, flow rate and other states of seawater during the circulation process, so that calcium carbonate precipitates can be continuously and stably formed during the injection of seawater into the reef body of the island or reef, filling the pore space inside and between the calcareous sand particles, improving the physical, mechanical and engineering properties of the calcareous sand particles and calcareous sand soil, especially the overall strength, liquefaction resistance and seepage characteristics of the calcareous sand foundation.

[0071] Calcareous sand particles have typical physical and mechanical properties such as irregular shape, high angle, internal pore development and particle crushing, which are significantly different from widely used terrestrial materials such as quartz sand. Especially in pile foundation engineering, the blown-fill calcareous sand foundation shows extremely low pile side friction resistance, causing serious economic losses. This is mainly due to the low strength of calcareous sand particles and the easy occurrence of particle crushing during the pile formation process.

[0072] Coral islands and reefs grow on volcanic bedrock, forming a special binary geological structure with coral reef limestone with a thickness of up to thousands of meters at the bottom and uncemented or weakly cemented coral calcareous sand on the surface. Coral islands and reefs usually include four geomorphic units in the horizontal direction: seaward slope, outer reef flat, inner reef flat and lagoon. Some coral islands and reefs may also develop gray sand island geomorphic units that are stably exposed to the sea surface on the inner reef flat. Among them, the inner reef flat has a large area, relatively flat terrain, and stable hydrodynamic conditions, making it the most suitable area for engineering construction. However, the surface of the inner reef flat is in the intertidal zone, which is submerged at high tide and exposed to the sea surface at low tide. Therefore, it is necessary to artificially fill a certain thickness of accumulation on the inner reef flat, that is, to carry out island and reef filling, so that the surface of the inner reef flat is higher than the local highest tide level, so that engineering construction can be carried out on it and buildings and structures can be protected from waves. Before filling the islands and reefs, it is necessary to first set up steel cylindrical cofferdams around the island filling area and weld them into a whole, which can provide a relatively stable marine dynamic environment and reduce the loss of fillers under the dynamic effects of waves and ocean currents. During the island filling process, the suction dredger obtains loose sand by cutting and crushing the reefs, or directly uses natural calcareous sand in lagoons and other environments, pumps it together with seawater and fills it into the cofferdam. After filling to the predetermined depth, the calcareous sand foundation is initially formed, and it is still necessary to further process the calcareous sand foundation using engineering techniques such as tamping and vibrocompaction, the main purpose of which is to improve the compactness and bearing capacity of the foundation. However, the calcareous sand foundation at this time still exhibits the characteristics of looseness, lack of bonding or weak bonding, high initial water content, liquefaction and weak pile-soil interaction, and cannot be directly used for island and reef engineering construction. Therefore, it is necessary to reinforce the calcareous sand stratum.

[0073] Solar energy is an inexhaustible clean renewable energy source. There is no carbon emission and other environmental pollution in the process of utilization. The reserves of solar energy are huge. According to the total annual solar radiation, the global surface is divided into resource-rich areas, resource-rich areas, resource-available areas and resource-deficient areas. Due to the influence of factors such as the angle of solar incidence and atmospheric dissipation, solar energy resources are mainly distributed in tropical and subtropical areas at low latitudes, which is roughly the same as the latitude range of coral reefs. This provides a good material basis for the large-scale utilization of solar energy resources in coral islands and reefs. At present, the main way to utilize solar energy is to convert solar radiation energy into various forms such as heat energy, electrical energy and chemical energy for storage, transportation and utilization. Among them, the use of solar collectors to convert solar energy into heat energy for direct use has relatively less energy loss, and the efficiency of photothermal conversion can be as high as more than 80%. Therefore, it can be considered that coral islands and reefs usually have abundant solar energy resources. Solar energy photothermal conversion has extremely high utilization value and economic and ecological advantages in island and reef engineering construction, especially in improving the overall strength, anti-liquefaction performance and seepage characteristics of calcareous sand foundation.

[0074] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation, structure, features and effects of a thermal insulation material, a heat collection bag, and a device and method for solidifying a blown-fill calcareous sand foundation proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0075] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B. Specifically, it is understood that: A and B may be included at the same time, A may exist alone, or B may exist alone, and any of the above three situations may be met.

[0076] Insulation Materials

[0077] See attached Figure 2 The thermal insulation material provided by the embodiment of the present invention includes a heat absorbing layer 18, a heat insulating layer 19 and a fabric layer 20. The heat absorbing layer 18, the heat insulating layer 19 and the fabric layer 20 are fixedly compounded into one from top to bottom.

[0078] The thermal insulation material provided by the embodiment of the present invention includes a heat absorption layer 18, a heat insulation layer 19 and a fabric layer 20, wherein the heat absorption layer 18 can absorb heat; the heat insulation layer 19 can reduce heat loss; and the fabric layer 20 can enhance the toughness of the thermal insulation material itself and extend its service life.

[0079] The heat absorption layer 18 is made of a black polymer. In this case, the black polymer absorbs most of the visible light and reflects very little. Since it absorbs most of the light, it also absorbs most of the heat. Therefore, the heat absorption layer 18 made of a black polymer can improve the heat absorption efficiency.

[0080] Wherein, the heat insulation layer 18 is made of aluminum-based reflective heat insulation material. In this case, the aluminum-based reflective heat insulation material can effectively handle the heat dissipation problem, can alleviate the problem of thermal expansion and contraction of different materials, and improve durability and reliability.

[0081] The fabric layer 20 is made of wear-resistant fabric. In this case, the fabric has a certain toughness. However, in order to improve the service life of the thermal insulation material during use, its wear resistance should also be increased. The wear resistance of the fabric refers to the performance of the fabric in resisting wear. Wear refers to the phenomenon that the fabric is gradually damaged by repeated friction with other objects during use.

[0082] The fixing and compounding includes one or a combination of several methods such as suturing, gluing and compacting. In this case, the integration of the thermal insulation material itself can be increased, and the difficulty of compounding with other materials can be reduced.

[0083] Solar collector bag

[0084] See attached Figure 2 The solar heat collection bag provided by the embodiment of the present invention includes a transparent heat-permeable portion 17 and the heat-insulating material provided by the present invention. The edge of the transparent heat-permeable portion 17 is the first edge, and the edge of the heat-insulating material is the second edge. The transparent heat-permeable portion 17 and the heat-insulating material are combined into one by the first edge and the second edge, and a containing space is formed between the transparent heat-permeable portion 17 and the heat-insulating material, so that the medium contained in the containing space can be heated by solar energy.

[0085] The transparent heat-permeable portion 17 of the solar thermal collection bag provided in the embodiment of the present invention is combined into one by its first edge and the second edge of the thermal insulation material. When used, the transparent heat-permeable portion 17 is arranged to face the sun, and the thermal insulation material is on the bottom side of the transparent heat-permeable portion 17. In this case, the transparent heat-permeable portion 17 and the thermal insulation material complement each other, so that the solar radiation heat can enter the accommodating space formed between the transparent heat-permeable portion 17 and the thermal insulation material. When the accommodating space contains a medium to be heated, the medium to be heated can be heated by the solar radiation heat.

[0086] Wherein, transparent heat-transmitting part 17 is made of ethylene-tetrafluoroethylene copolymer material.Ethylene-tetrafluoroethylene copolymer is a kind of chemical substance, and ETFE is the toughest fluoroplastic, and it has improved greatly in radiation resistance and mechanical property while maintaining the good heat resistance, chemical resistance and electrical insulation performance of PTFE, and tensile strength can reach 50MPa, which is close to 2 times of polytetrafluoroethylene.Long-term use temperature -80--220 degrees, has remarkable chemical corrosion resistance, is corrosion-resistant to all chemicals, friction coefficient is the lowest in plastics, and has good electrical property, and its electrical insulation is not affected by temperature.Its chemical resistance is similar to polytetrafluoroethylene, better than vinylidene fluoride.Its creep resistance and compression strength are better than polytetrafluoroethylene, and tensile strength is high, and elongation can reach 100-300%.Good dielectric property, excellent radiation resistance. ETFE has good processing formability, balanced physical properties, good mechanical toughness, and excellent radiation resistance. The material has the corrosion resistance of polytetrafluoroethylene, overcomes the non-stickiness of polytetrafluoroethylene to metals, and its average linear expansion coefficient is close to that of carbon steel, making ETFE (F-40) an ideal composite material for metals.

[0087] The solar heat collection bag further includes an inlet pipe and an outlet pipe. The inlet pipe is connected to one end of the solar heat collection bag, and the outlet pipe is connected to the other end of the solar heat collection bag, so that the accommodating space is connected to the outside world through the inlet pipe and the outlet pipe. In this case, the solar heat collection bag can communicate with the outside world through the inlet pipe and the outlet pipe, can receive the medium to be heated in real time, and can flow out the medium to be heated, so that the medium to be heated can be continuously heated to achieve continuous operation.

[0088] Among them, the solar thermal collector bag 9 also includes a pressure relief valve 8. The pressure relief valve 8 is arranged on the solar thermal collector bag 9, so that the excess pressure in the accommodation space can be relieved through the pressure relief valve 8. In this case, before the medium to be heated is input into the solar thermal collector bag 9, there is air in the solar thermal collector bag 9. Since the volume of the accommodation space of the solar thermal collector bag 9 itself is determined, the amount n of the air originally accommodated is also determined. After the accommodation space of the solar thermal collector bag 9 is filled with the medium to be heated, the accommodation space originally occupied by the air is occupied by the medium to be heated. According to the ideal gas state equation pV=nRT, where p-gas pressure, Pa; V-gas volume, m 3 ; R-gas constant, J / (mol·K); T-system temperature, K. It can be seen that for a certain solar thermal collector bag 9, n and R are fixed and unchanged, T increases with solar heating, and nRT on the right side of the ideal gas state equation also increases with solar heating. However, on the left side of the ideal gas state equation, V decreases due to the introduction of the medium to be heated. Therefore, as the medium to be heated is continuously introduced into the solar thermal collector bag 9, the pressure in the solar thermal collector bag 9 will not only increase, but the increase will also increase more as the medium to be heated increases and the heating temperature increases. Therefore, a pressure relief valve 8 is provided on the solar thermal collector bag 9 to release the gas therein and avoid safety accidents caused by excessive pressure.

[0089] Device for solidifying blown-fill calcareous sand foundation

[0090] See attached Figure 1The device for solidifying the blown-fill calcareous sand foundation provided in an embodiment of the present invention includes a water intake component, the solar thermal collector bag 9 provided in the present invention, and a water injection component. The water intake component is connected to the storage space of the solar thermal collector bag 9, so that the seawater obtained by the water intake component can be input into the storage space of the solar thermal collector bag 9. The solar thermal collector bag 9 utilizes solar energy to heat the seawater input into the solar thermal collector bag 9 to obtain heated seawater. The water injection component is connected to the storage space of the solar thermal collector bag 9, and the heated seawater can be injected into the loose calcareous sand formation through the water injection component, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

[0091] The device for solidifying the blown-fill calcareous sand foundation provided in the embodiment of the present invention comprises a water intake component, the solar energy collecting bag 9 provided in the present invention, and a water injection component, wherein normal temperature seawater can be input into the accommodating space of the solar energy collecting bag 9 via the water intake component, and under the action of solar energy radiation heat, the normal temperature seawater is heated to become heated seawater. Finally, through the water injection component, the heated seawater can be injected into the loose calcareous sand formation, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation. Therefore, the overall strength, anti-liquefaction performance and seepage characteristics of the calcareous sand foundation can be improved, and it has extremely high utilization value and economic and ecological advantages. In this embodiment, the solar energy collecting bag 9 has a length of 3m, a width of 2m, a height of 0.4m, and a water storage capacity of 2m 3 , the maximum allowable pressure is 200kPa.

[0092] The water intake assembly includes a filter 4, an impeller assembly 3, a water lifting pipe 2 and a water delivery pipe 5. The filter 4 is fixedly arranged at the water inlet end of the impeller assembly 3, the water inlet end of the water lifting pipe 2 is fixedly connected to the water outlet end of the impeller assembly 3, the water outlet end of the water lifting pipe 2 is fixedly connected to the water inlet end of the water delivery pipe 5, and the water outlet end of the water delivery pipe 5 is fixedly connected to the inlet pipeline of the solar heat collection bag 9, so that the seawater can enter the accommodation space of the solar heat collection bag 9 after passing through the filter 4, the impeller assembly 3, the water lifting pipe 2 and the water delivery pipe 5 in sequence. In this case, the impurities in the seawater can be filtered out through the filter 4, the negative pressure can be generated through the impeller assembly 3, so that the seawater can be smoothly drawn into the water lifting pipe 2, and then through the water delivery pipe 5, the flow rate of the seawater to be heated input into the solar heat collection bag 9 can be stabilized. In this embodiment, the impeller group 3 is made of 316L molybdenum-containing stainless steel, with a two-stage impeller design, the diameter of the water inlet and outlet is 100-200mm, and the rated flow rate is 300m 3 / h, rated head 50m. The total length of the seawater circulation pump is 10-12m, and the filter is installed 4-5m below the lowest water level.

[0093] The device for solidifying the calcareous sand foundation further includes a coupling 1. The diameter of the outlet end of the water lifting pipe 2 is smaller than the diameter of the water inlet end of the water delivery pipe 5. The coupling 1 includes a first port and a second port. The diameter of the first port is equal to the diameter of the outlet end of the water lifting pipe 2, and the diameter of the second port is equal to the diameter of the water inlet end of the water delivery pipe 5. The coupling 1 is fixedly connected to the outlet end of the water lifting pipe 2 through the first port, and the coupling 1 is fixedly connected to the water inlet end of the water delivery pipe 5 through the second port. In this case, the diameter of the water delivery pipe 5 can be reduced by the coupling 1, so that the seawater in the water lifting pipe 2 can flow into the solar heat collection bag 9 more smoothly.

[0094] The device for solidifying the blown-filled calcareous sand foundation further includes a pressure regulating valve 6. The pressure regulating valve 6 is disposed on the water pipe 5, and is used to adjust the water flow in the water pipe 5. In this case, the water flow in the water pipe 5 can be controlled by controlling the opening of the pressure regulating valve 6, so that the working state of the solar heat collection bag 9 is more stable. In this embodiment, the pressure of the seawater in the water pipe 5 and the solar heat collection bag 9 is controlled by the pressure regulating valve 6 to be no more than 200 kPa.

[0095] The device for solidifying the blown-fill calcareous sand foundation further includes a connecting piece. The solar heat collecting bag 9 includes a plurality of solar heat collecting bags 9, which are connected in series and / or in parallel, wherein the plurality of solar heat collecting bags 9 connected in series are connected through a connecting piece. In this case, the number of solar heat collecting bags 9 can be reasonably set according to the actual project scale.

[0096] The connecting piece is a flexible water pipe. One end of the flexible water pipe is connected between two adjacent solar heat collecting bags 9, so that the outlet pipe of the first solar heat collecting bag 9 in the two adjacent solar heat collecting bags 9 is connected with the inlet pipe of the second solar heat collecting bag 9 after passing through the flexible water pipe. In this case, it can be ensured that seawater can be conveniently filled and passed through the two adjacent solar heat collecting bags 9 in series.

[0097] The device for solidifying the blown-fill calcareous sand foundation further includes a connector. The multiple solar heat collecting bags 9 connected in series are also connected together by the connector. In this case, the connection reliability of the multiple solar heat collecting bags 9 can be ensured, and even if the connecting piece has a connection risk, the occurrence of connection safety accidents can be avoided.

[0098] The water injection assembly includes a water injection pipeline and a water injection piece. The water inlet end of the water injection pipe is fixedly connected to the outlet pipe of the solar heat collecting bag 9, and the water outlet end of the water delivery pipe is fixedly connected to the water injection piece, so that the seawater heated by solar energy in the accommodating space of the solar heat collecting bag 9 passes through the water injection pipeline and the water injection piece in sequence, and is injected into the loose calcareous sand formation, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation. In this embodiment, the water injection piece includes multiple ones. The water injection part includes a pipe cap 13 and an end pipe 16. The pipe cap is provided on one end of the end pipe 16. The other end of the end pipe 16 has a tapered end. A plurality of branches are provided on the water injection pipeline. The number of branches is the same as the number of water injection parts, so that the branches correspond to the water injection parts one by one. The seawater passing through the water injection pipeline passes through the branches and the end pipe in turn, and is injected into the loose calcareous sand formation from the tapered end of the end pipe, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation. In this case, the tapered end of the end pipe 16 of the water injection part can make it easier for seawater to be filled in the pores between the calcareous sand particles. In this embodiment, the pipe cap and the end pipe 16 are made of stainless steel.

[0099] Among them, the device for solidifying the blown-filled calcareous sand foundation also includes an extension tube 14 and a threaded joint 15. The threaded joint 15 is hollow, and the extension tube 14 is arranged between the pipe cap 13 and the end pipe 16, so that the pipe cap 13 is connected and communicated with the end pipe 16 by means of the threaded joint 15. In this case, the length of the water injection part can be extended by the extension tube 14, so that the device for solidifying the blown-filled calcareous sand foundation provided by the embodiment of the present invention has a wider applicability. In this embodiment, the extension tube 14 can have a variety of length specifications, which can be used in combination according to the depth of the foundation to be reinforced.

[0100] Among them, a plurality of through holes are arranged on the pipe wall of the extension pipe 14 and the end pipe 16. In this case, not only the tapered end of the end pipe 16 of the water injection piece allows the seawater to be more conveniently filled into the pores between the calcareous sand particles, but the seawater can also be filled into the pores between the calcareous sand particles through the plurality of through holes arranged on the pipe wall, and the filling efficiency is higher. In this embodiment, the total length of the water injection piece is 4m, the diameter of the extension pipe 14 and the end pipe 16 is 108mm, the plane layout is plum blossom type, and the horizontal spacing is 5m. The diameter of the through hole is 10mm, and it is arranged in a spiral shape.

[0101] The device for solidifying the calcareous sand foundation further includes a booster pump 11. The booster pump 11 is arranged on the water injection pipeline, so that the flow rate and flow rate of seawater output through the water injection pipeline are increased on the original basis. In this case, the filling efficiency of seawater in the pores between the calcareous sand particles can be further improved. In this embodiment, the output pressure of the seawater in the solar heat collection bag 9 can be increased to 300-500 kPa by the booster pump 11.

[0102] Method for solidifying calcareous sand foundation

[0103] See attached Figure 3 The method for solidifying the blown-filled calcareous sand foundation provided in the embodiment of the present invention is realized based on the device for solidifying the blown-filled calcareous sand foundation provided in the present invention. The method for solidifying the blown-filled calcareous sand foundation comprises the following steps:

[0104] Step S1: Normal temperature seawater with a temperature of 15°C-25°C passes through the water intake assembly and enters the accommodation space of the solar heat collection bag 9;

[0105] Step S2: The seawater in the accommodation space of the solar heat collecting bag 9 is heated by solar energy to form high-temperature seawater with a temperature of 50° C. to 70° C.;

[0106] Step S3: high-temperature seawater is injected into the loose calcareous sand formation through the water injection assembly, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

[0107] The method for solidifying a blown-filled calcareous sand foundation provided by an embodiment of the present invention is realized based on an apparatus for solidifying a blown-filled calcareous sand foundation provided by an embodiment of the present invention. Normal temperature seawater with a temperature of 15°C-25°C passes through a water intake component of the apparatus for solidifying a blown-filled calcareous sand foundation and enters the accommodating space of a solar energy collecting bag of the apparatus for solidifying a blown-filled calcareous sand foundation; the seawater in the accommodating space of a solar energy collecting bag of the apparatus for solidifying a blown-filled calcareous sand foundation is heated by solar energy to form high temperature seawater with a temperature of 50°C-70°C; the high temperature seawater is injected into a loose calcareous sand formation through a water injection component of the apparatus for solidifying a blown-filled calcareous sand foundation, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation, which has extremely high utilization value and economic and ecological advantages.

[0108] Solar thermal collector bags with heating, heat preservation, water storage and circulation functions are laid on the surface of the strata of the coral island reef flat. According to the actual situation of the project, the solar thermal collector bags can be used alone or in combination with a heating array composed of multiple solar thermal collector bags. Through the seawater circulation pump set at the edge of the coral island or anywhere near the area to be reinforced, usually a vertical long-axis pump made of molybdenum-containing stainless steel that is resistant to seawater corrosion, the low-temperature seawater at a certain depth below the sea surface is pumped into the solar thermal collector bags laid on the reef flat. The low-temperature seawater in the solar thermal collector bags is continuously heated by utilizing the abundant solar energy resources in tropical areas and the temperature difference between the deep sea and the surface. Since the solubility of calcium carbonate decreases with the increase of seawater temperature, when the higher temperature seawater is injected into the calcareous sand stratum through the water injection piece, the temperature of the surface seawater inside the reef increases, resulting in a decrease in the solubility of calcium carbonate and the precipitation of calcium carbonate. As the hotter mixed seawater inside the reef body continues to flow out and is replaced by natural low-temperature seawater, the high-temperature seawater obtained by solar heating in the solar collector bag is continuously injected through the water injection piece, the temperature of the high-temperature seawater gradually decreases and the temperature of the low-temperature seawater gradually increases. Calcium carbonate continues to dissolve and precipitate, and its spatial position changes with the movement of seawater. In addition, the dissolution of calcium carbonate is believed to occur equally at the interface between water and solid, while the precipitation process of calcium carbonate usually occurs preferentially on the rough surface of calcareous sand particles, the pores within the particles, and the contact position between adjacent particles, and then gradually fills in the pores between calcareous sand particles. Therefore, calcium carbonate solids can: (1) fill the internal pores of calcareous sand particles, improve the mechanical properties of individual calcareous sand particles, and reduce the occurrence of particle breakage; (2) precipitate between adjacent calcareous sand particles to form connecting bonds, and on this basis further fill the pore space between particles, significantly improving the overall strength, anti-liquefaction performance and seepage characteristics of calcareous sand foundations.

[0109] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0110] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for solidifying a calcareous sand foundation, characterized in that: It comprises a water intake component, a solar heat collection bag (9), and a water injection component. The solar heat collection bag comprises a transparent heat-permeable portion (17) and a heat-insulating material, wherein the heat-insulating material comprises a heat-absorbing layer (18), a heat-insulating layer (19) and a fabric layer (20), and the heat-absorbing layer (18), the heat-insulating layer (19) and the fabric layer (20) are fixedly compounded into one from top to bottom; The edge of the transparent heat-transmitting portion (17) is a first edge, and the edge of the heat-insulating material is a second edge; The transparent heat-permeable portion (17) and the heat-insulating material are combined into one body through the first edge and the second edge, and a containing space is formed between the transparent heat-permeable portion (17) and the heat-insulating material, so that the medium contained in the containing space can be heated by solar energy; The water intake component is in communication with the accommodation space of the solar heat collection bag (9), so that the seawater obtained by the water intake component can be input into the accommodation space of the solar heat collection bag (9); The solar heat collection bag (9) utilizes solar energy to heat the seawater input into the solar heat collection bag (9) to obtain heated seawater; The water injection assembly is in communication with the accommodating space of the solar thermal collector bag (9), and the heated seawater can be injected into the loose calcareous sand formation through the water injection assembly, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation.

2. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: The heat absorbing layer (18) is made of black polymer.

3. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: The heat insulation layer (19) is made of an aluminum-based reflective thermal insulation material.

4. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: The fabric layer (20) is made of wear-resistant fabric.

5. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: The fixing and bonding includes one or a combination of several methods including suturing, gluing and compacting.

6. The device for solidifying calcareous sand foundation according to claim 5, characterized in that: The transparent heat-transmitting portion (17) is made of ethylene-tetrafluoroethylene copolymer material.

7. The device for solidifying calcareous sand foundation according to claim 5, characterized in that: It also includes inlet and outlet pipes. The inlet pipeline is connected to one end of the solar heat collecting bag, and the outlet pipeline is connected to the other end of the solar heat collecting bag, so that the accommodating space is connected to the outside through the inlet pipeline and the outlet pipeline.

8. The device for solidifying calcareous sand foundation according to claim 5, characterized in that: It also includes a pressure relief valve (8), The pressure relief valve (8) is arranged on the solar heat collecting bag, so that the excess pressure in the accommodating space can be relieved through the pressure relief valve (8).

9. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: The water intake assembly comprises a filter screen (4), an impeller assembly (3), a water lift pipe (2) and a water delivery pipe (5). The filter screen (4) is fixedly arranged at the water inlet end of the impeller group (3), the water inlet end of the water pumping pipe (2) is fixedly connected to the water outlet end of the impeller group (3), the water outlet end of the water pumping pipe (2) is fixedly connected to the water inlet end of the water delivery pipe (5), and the water outlet end of the water delivery pipe (5) is fixedly connected to the inlet pipeline of the solar heat collection bag (9), so that seawater can enter the accommodating space of the solar heat collection bag (9) after passing through the filter screen (4), the impeller group (3), the water pumping pipe (2) and the water delivery pipe (5) in sequence.

10. The device for solidifying calcareous sand foundation according to claim 9, characterized in that: Also includes a coupling (1), The water outlet diameter of the water lift pipe (2) is smaller than the water inlet diameter of the water delivery pipe (5). The coupling (1) comprises a first port and a second port, wherein the diameter of the first port is equal to the diameter of the water outlet end of the water lift pipe (2), and the diameter of the second port is equal to the diameter of the water inlet end of the water delivery pipe (5). The coupling (1) is fixedly connected to the water outlet end of the water lift pipe (2) via the first port, and the coupling (1) is fixedly connected to the water inlet end of the water delivery pipe (5) via the second port.

11. The device for solidifying calcareous sand foundation according to claim 9, characterized in that: It also includes a pressure regulating valve (6), The pressure regulating valve (6) is arranged on the water delivery pipe (5), and the pressure regulating valve (6) is used to adjust the water flow in the water delivery pipe (5).

12. The device for solidifying calcareous sand foundation according to claim 1, characterized in that: Also includes connecting parts, The solar heat collecting bag (9) comprises a plurality of: The plurality of solar heat collecting bags (9) are connected in series and / or in parallel, wherein the plurality of solar heat collecting bags (9) connected in series are connected via the connecting piece.

13. The device for solidifying calcareous sand foundation according to claim 12, characterized in that: The connecting piece is a flexible water pipe. One end of the flexible water pipe is connected between two adjacent solar heat collecting bags (9), so that in the two adjacent solar heat collecting bags (9), the outlet pipe of the front solar heat collecting bag (9) passes through the flexible water pipe and is connected to the inlet pipe of the rear solar heat collecting bag (9).

14. The device for solidifying calcareous sand foundation according to claim 13, characterized in that: Also includes connectors, The plurality of solar heat collecting bags (9) connected in series are also connected together via the connecting piece.

15. The device for solidifying calcareous sand foundation according to claim 9, characterized in that: The water injection assembly includes a water injection pipeline and a water injection piece. The water inlet end of the water injection pipe is fixedly connected to the outlet pipeline of the solar heat collecting bag (9), and the water outlet end of the water delivery pipe is fixedly connected to the water injection piece, so that the seawater heated by solar energy in the accommodating space of the solar heat collecting bag (9) passes through the water injection pipe and the water injection piece in sequence, and is then injected into the loose calcareous sand formation, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

16. The device for solidifying calcareous sand foundation according to claim 15, characterized in that The water injection parts include a plurality of The water injection member comprises a pipe cap (13) and an end pipe (16), wherein the pipe cap is disposed on one end of the end pipe (16), and the other end of the end pipe (16) has a tapered end. The water injection pipeline is provided with a plurality of branches, the number of the branches is the same as the number of the water injection pieces, so that the branches correspond to the water injection pieces one by one. The seawater passing through the water injection pipeline passes through the branch and the end pipe in sequence, and is then injected into the loose calcareous sand formation from the tapered end of the end pipe, thereby reducing the solubility of calcium carbonate in the loose calcareous sand formation and continuously generating calcium carbonate precipitation in the pores of the calcareous sand formation.

17. The device for solidifying calcareous sand foundation according to claim 16, characterized in that: It also includes an extension tube (14) and a threaded connector (15). The threaded joint (15) is hollow. The extension tube (14) is arranged between the tube cap (13) and the end tube (16), so that the tube cap (13) is connected and communicated with the end tube (16) by means of the threaded joint (15).

18. The device for solidifying calcareous sand foundation according to claim 17, characterized in that: A plurality of through holes are provided on the tube walls of the extension tube (14) and the end tube (16).

19. The device for solidifying calcareous sand foundation according to claim 15, characterized in that: It also includes a booster pump (11), The booster pump (11) is arranged on the water injection pipeline, so that the flow rate and flow rate of seawater output through the water injection pipeline are increased on the original basis.

20. A method for consolidating a calcareous sand foundation, characterized in that: The method for solidifying the blown-filled calcareous sand foundation is realized based on the device for solidifying the blown-filled calcareous sand foundation described in any one of claims 1 to 19, and the method for solidifying the blown-filled calcareous sand foundation comprises the following steps: Normal temperature seawater with a temperature of 15°C to 25°C passes through the water intake assembly and enters the accommodation space of the solar heat collection bag (9); The seawater in the accommodation space of the solar heat collecting bag (9) is heated by solar energy to form high-temperature seawater with a temperature of 50° C. to 70° C.; The high-temperature seawater is injected into the loose calcareous sand formation through the water injection assembly, so that the solubility of calcium carbonate in the loose calcareous sand formation is reduced, and calcium carbonate precipitation is continuously generated in the pores of the calcareous sand formation.

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