CN115094875B - High-heat-conductivity water-permeable energy pile and manufacturing method thereof - Google Patents
High-heat-conductivity water-permeable energy pile and manufacturing method thereof Download PDFInfo
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- CN115094875B CN115094875B CN202210793977.8A CN202210793977A CN115094875B CN 115094875 B CN115094875 B CN 115094875B CN 202210793977 A CN202210793977 A CN 202210793977A CN 115094875 B CN115094875 B CN 115094875B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
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- Civil Engineering (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a high heat conduction water permeable energy pile and a manufacturing method thereof, wherein the high heat conduction water permeable energy pile comprises a concrete pile body, a steel reinforcement cage embedded in the concrete pile body and a heat exchange tube structure, wherein the heat exchange tube structure comprises a plurality of heat exchange tubes fixedly arranged on the steel reinforcement cage, a main water inlet pipeline connected with water inlets of the heat exchange tubes, a main water outlet pipeline connected with water outlets of the heat exchange tubes, a water inlet pipe connected with the main water inlet pipeline and a water outlet pipe connected with the main water outlet pipeline. According to the high-heat-conductivity water-permeable energy pile, the heat exchange tube structure is fixed on the inner reinforcement cage and the outer reinforcement cage, so that the heat exchange tube structure and the inner reinforcement cage and the outer reinforcement cage form a connected whole, the stability of the water-permeable energy pile is enhanced, and liquid is in contact with heated concrete with a larger area through the plurality of heat exchange tubes, so that the heat exchange efficiency of the energy pile is improved.
Description
Technical Field
The invention relates to the field of buildings, in particular to a high-heat-conductivity water-permeable energy pile and a manufacturing method thereof.
Background
The development and utilization of geothermal energy have great significance for reducing the total carbon emission in the running process of the building, and more particularly
The important measure for realizing the 'two carbon' strategic target in China is realized. The heat exchanger is buried in the building pile foundation in advance, and the circulating liquid in the heat exchanger circularly flows between a circulating system attached to the ground building facilities and the heat exchanger in the pile foundation to exchange energy, so that the heating/refrigerating aim of the ground building is fulfilled. The energy pile system can be simultaneously carried out with the building pile foundation in the construction process, does not occupy additional time and construction space, and has great environmental benefit while considering economical efficiency.
At present, although the application of the energy pile is more extensive than before, the research on the technology is still lagged, the bottleneck is encountered by improving the heat exchange efficiency of the energy pile by optimizing the type and the operation mode of a heat exchanger, the utilization efficiency of shallow geothermal energy cannot be further improved, the concrete heat conductivity coefficient of the pile body of the traditional energy pile is low, the heat convection effect of underground water cannot be fully utilized, and the heat exchange efficiency is difficult to further improve. Therefore, the research on how to efficiently improve the heat exchange performance of the energy pile has important practical significance and social significance.
Disclosure of Invention
The invention aims to provide a high-heat-conductivity water-permeable energy pile and a manufacturing method of the high-heat-conductivity water-permeable energy pile.
The utility model provides a high heat conduction water permeable energy source stake, includes the concrete pile body, buries the steel reinforcement skeleton and the heat exchange tube structure of establishing in the concrete pile body, the heat exchange tube structure is including setting firmly many heat exchange tubes on the steel reinforcement skeleton, connect each the main inlet channel of heat exchange tube water inlet, connect the main outlet channel of each heat exchange tube delivery port, the inlet tube of being connected with main inlet channel and the outlet pipe of being connected with main outlet channel, the steel reinforcement skeleton is formed by two-layer cylindric steel reinforcement cage concentric arrangement in inside and outside, the heat exchange tube is U-shaped heat exchange tube, U-shaped heat exchange tube is evenly distributed and along inlayer steel reinforcement cage circumference along radial arrangement, each U-shaped heat exchange tube's inner tube is fixed inlayer steel reinforcement cage inboard, each U-shaped heat exchange tube's outer tube is fixed in outer steel reinforcement cage inboard, each U-shaped heat exchange tube's delivery port is in outer tube upper end, each U-shaped heat exchange tube's water inlet is in inner tube upper end, main inlet channel and main outlet channel are the annular pipeline.
Preferably, the surface of the reinforcement cage is coated with antirust silver paint.
A manufacturing method of a high-heat-conductivity water-permeable energy pile comprises the following steps: step 1, fixing an inner pipe of the U-shaped heat exchange pipe on the inner side of an inner layer reinforcement cage, fixing an outer pipe of the U-shaped heat exchange pipe on the inner side of an outer layer reinforcement cage, connecting the inner pipe of the U-shaped heat exchange pipe with a main water inlet pipeline, connecting the outer pipe of the U-shaped heat exchange pipe with a main water outlet pipeline, inserting the inner and outer layer reinforcement cages and the U-shaped heat exchange pipe into pile holes together through a hoisting machine, and enabling gaps to be formed between the inner and outer layer reinforcement cages and the bottoms of the pile holes and between the inner and outer layer reinforcement cages and the side walls of the pile holes, wherein water inlet pipes and water outlet pipes which are correspondingly connected with the main water inlet pipeline and the main water outlet pipeline extend out of the pile body;
step 2, adding high-heat-conductivity water-heat-permeable concrete into the pile hole to form a pile body, and curing; the high-conductivity water-heat-permeable concrete is prepared by stirring the following components in parts by weight: 14.5 to 15.5 parts of water, 41 to 42 parts of cement, 150 to 155 parts of crushed stone, 2.5 to 7.9 parts of silicon carbide, 2.6 to 2.7 parts of reinforcing agent and 0.7 to 0.8 part of water reducer.
Preferably, the broken stone is limestone broken stone, and the particle size is 5-12 mm.
Preferably, the water reducer is a naphthalene-based high-efficiency water reducer, and the main component is beta sodium naphthalene sulfonate formaldehyde condensate, and the water reducing rate is 16% -22%.
Preferably, the silicon carbide is a 1200 mesh green silicon carbide powder.
Preferably, the reinforcing agent is an SR ecological concrete reinforcing agent.
The beneficial effects of the invention are as follows: the utility model provides a high heat conduction energy stake that permeates water, heat exchange tube structure is fixed on including, outer steel reinforcement cage for heat exchange tube structure and interior, outer steel reinforcement cage form a continuous whole, strengthened the stability of energy stake that permeates water, many heat exchange tubes link to each other through annular main inlet channel and main outlet pipe way, liquid is through many heat exchange tubes contact the concrete of being heated of bigger area, silicon carbide that adds in the pile body concrete has improved pile body concrete coefficient of heat conductivity, abandon the sand and make the pile body have the permeability, the pile body permeates water so that make full use of groundwater's heat convection effect, thereby promote energy stake heat exchange efficiency.
The manufacturing method of the high-heat-conductivity water-permeable energy pile adopts high-heat-conductivity water-permeable concrete to form a pile body, water inlet and outlet pipes connected with a main water inlet pipe and a main water outlet pipe extend out of the outer surface of the pile body, silicon carbide is added into components of the high-heat-conductivity water-permeable concrete during manufacturing, an effective silicon carbide heat conduction channel is formed in the cement stone, and the effective heat conduction coefficient of the water-permeable concrete is improved, so that the heat exchange efficiency of the water-permeable energy pile is ensured. The reinforcing agent is added, so that cement stones and aggregates in the permeable concrete form a bonding surface with higher strength, the compressive strength of the permeable concrete is improved, and the bearing capacity of the permeable energy pile is ensured.
The silicon carbide is mixed in an amount of 15% of the initial cement weight fraction, and the heat conduction performance is highest. Wherein the initial weight of the cement is the total weight of the cement-containing cement, the silicon carbide, the water reducing agent and the reinforcing agent.
Drawings
Fig. 1 is a schematic structural view of a high heat conduction water permeable pile according to an embodiment of the present invention.
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1.
Fig. 3 is a schematic top view of fig. 1.
Fig. 4 is a schematic structural view of a reinforcement cage according to an embodiment of the present invention.
Fig. 5 is a graph showing the variation trend of the thermal conductivity of the concrete according to the present invention.
Detailed Description
The following is a detailed description with reference to the accompanying drawings.
Example 1
The utility model provides a high heat conduction water permeable energy stake, as shown in fig. 1-5, including concrete pile body 1, bury in the concrete pile body the reinforcement cage and heat exchange tube structure, heat exchange tube structure is including setting firmly the many U-shaped heat exchange tubes 2 on the reinforcement cage, connect the main inlet channel 7 of each U-shaped heat exchange tube water inlet, connect the main outlet channel 6 of each heat exchange tube delivery port, the inlet tube 8 of being connected with main inlet channel and the outlet pipe 5 of being connected with main outlet channel, the reinforcement cage is formed by two-layer cylindric reinforcement cage concentric setting in interior and exterior, the reinforcement cage surface scribbles rust-proof silver paint. The U-shaped heat exchange pipes are uniformly distributed along the circumferential direction of the inner layer reinforcement cage 3 and are arranged along the radial direction, the inner pipe of each U-shaped heat exchange pipe is fixed at the inner side of the inner layer reinforcement cage, the outer pipe of each U-shaped heat exchange pipe is fixed at the inner side of the outer layer reinforcement cage 4, the water outlet of each U-shaped heat exchange pipe is arranged at the upper end of the outer pipe, the water inlet of each U-shaped heat exchange pipe is arranged at the upper end of the inner pipe, and the main water inlet pipe and the main water outlet pipe are annular pipes.
The beneficial effects of this embodiment are: the high heat conduction energy pile that permeates water, heat exchange tube structure are fixed on inside and outside layer steel reinforcement cage for heat exchange tube structure and inside and outside layer steel reinforcement cage form a continuous whole, have strengthened the stability of energy pile that permeates water, and many heat exchange tubes link to each other through annular main inlet channel and main outlet conduit, and liquid is through many heat exchange tubes contact the concrete of being heated of bigger area.
Example 2
The manufacturing method of the high heat conduction water permeable energy pile, as shown in figures 1-5, comprises the following steps: step 1, fixing an inner pipe of the U-shaped heat exchange pipe on the inner side of an inner layer reinforcement cage, fixing an outer pipe of the U-shaped heat exchange pipe on the inner side of an outer layer reinforcement cage, connecting the inner pipe of the U-shaped heat exchange pipe with a main water inlet pipeline, connecting the outer pipe of the U-shaped heat exchange pipe with a main water outlet pipeline, inserting the inner and outer layer reinforcement cages and the U-shaped heat exchange pipe into pile holes together through a hoisting machine, and enabling gaps to be formed between the inner and outer layer reinforcement cages and the bottoms of the pile holes and between the inner and outer layer reinforcement cages and the side walls of the pile holes, wherein water inlet pipes and water outlet pipes which are correspondingly connected with the main water inlet pipeline and the main water outlet pipeline extend out of the pile body;
step 2, adding high-heat-conductivity water-heat-permeable concrete into the pile hole to form a pile body, and curing; the high-conductivity water-heat-permeable concrete is prepared by stirring the following components in parts by weight: 14.5 to 15.5 parts of water, 41 to 42 parts of cement, 150 to 155 parts of crushed stone, 2.5 to 7.9 parts of silicon carbide, 2.6 to 2.7 parts of reinforcing agent and 0.7 to 0.8 part of water reducer.
Wherein in the steps, the broken stone is limestone broken stone, the grain diameter is 5-12 mm, the water reducing agent is naphthalene high-efficiency water reducing agent, the main component is beta sodium naphthalene sulfonate formaldehyde condensate, the water reducing rate is 16-22%, the silicon carbide is 1200-mesh green silicon carbide powder, and the reinforcing agent is SR ecological concrete reinforcing agent.
The silicon carbide added in the pile body concrete improves the heat conductivity coefficient of the pile body concrete, thereby improving the heat exchange efficiency of the energy pile.
In this embodiment, the end point values and any intermediate values in the ranges of each component may be selected as required, and various specific mixing ratios are not listed here. It should be noted that the mesh number of the silicon carbide of this example was 1200 mesh. The broken stone is limestone broken stone with the grain diameter of 5-12 mm.
The manufacturing method of the high heat conduction permeable energy pile adopts high heat conduction permeable concrete to form a pile body, water inlet and outlet pipes connected with a main water inlet pipe and a main water outlet pipe extend out of the outer surface of the pile body, silicon carbide is added into components of the high heat conduction permeable concrete during manufacturing, an effective silicon carbide heat conduction channel is formed in the cement stone, the effective heat conduction coefficient of the permeable concrete is improved, the heat exchange efficiency of the permeable energy pile is guaranteed, sand is abandoned to enable the pile body to have water permeability, and the pile body is permeable so as to make full use of the heat convection effect of underground water. The reinforcing agent is added, so that cement stones and aggregates in the permeable concrete form a bonding surface with higher strength, the compressive strength of the permeable concrete is improved, and the bearing capacity of the permeable energy pile is ensured.
Experiments show that when the mesh number of the silicon carbide is changed, the heat conductivity coefficient is not a linear change rule, and after numerous experiments, technicians find that when the mesh number of the silicon carbide is 12, the heat conductivity coefficient is better than that of 46 meshes, and even the effect of 120 meshes can be achieved when the weight fraction of the initial cement is 10%, so that the cost performance is highest.
And (3) testing:
in order to analyze the influence of the silicon carbide doping amount and the designed porosity on the effective heat conductivity coefficient, the mechanical property and the permeability of the pervious concrete, 5 percent, 10 percent, 15 percent of the silicon carbide doping amount and 9 percent, 12 percent and 15 percent of the designed porosity of the initial cement are respectively selected for proportioning, the additive is a water reducing agent and an reinforcing agent, the doping amount of the water reducing agent is 1.5 percent of the initial cement mass, the doping amount of the reinforcing agent is 5 percent of the initial cement mass, and the specific proportioning ratio is shown in table 1
Table 1: the compression strength test, the permeability coefficient and the heat conductivity coefficient test are carried out on the high heat conductivity permeable concrete test piece doped with silicon carbide (SiC). The compressive strength test results of the pervious concrete under the condition of different doping amounts of silicon carbide are shown in table 2.
Table 2: and (5) a compression strength test result of the high-heat-conductivity pervious concrete.
Table 3: and (3) the permeability coefficient of the high-heat-conductivity permeable concrete.
Table 4: and (3) an effective heat conductivity coefficient result of the high heat conductivity pervious concrete.
Table 2 shows that the compressive strength of the pervious concrete is obviously improved with the increase of the silicon carbide doping amount when the designed porosity is constant. At a certain silicon carbide doping amount, the compressive strength of the pervious concrete is obviously reduced along with the increase of the design porosity.
As can be seen from Table 3, the permeability coefficient of the pervious concrete gradually decreases as the amount of silicon carbide doped increases at the time of designing the porosity.
As shown in Table 4, the effective thermal conductivity of the pervious concrete increases with increasing silicon carbide doping amount, for example, the thermal conductivity of the pervious concrete set cement increases by about 43.53% when the silicon carbide doping amount increases from 5% to 15%. When the silicon carbide doping amount is fixed, the effective heat conductivity coefficient of the pervious concrete is reduced along with the increase of the design porosity.
In conclusion, a certain amount of silicon carbide (SiC) heat conduction reinforcing material is doped in the high heat conduction pervious concrete, so that the effective heat conduction coefficient of the pervious concrete can be greatly improved, the compressive strength of the pervious concrete can be also slightly improved, and the permeability can be reduced. When the design porosity is smaller, the permeability is obviously improved along with the increase of the design porosity, but the compressive strength and the heat conduction property are obviously reduced.
The foregoing is a preferred embodiment of the present invention, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the invention, but rather that obvious modifications or alternatives to the embodiments described above will be apparent to those skilled in the art.
Claims (7)
1. The high-heat-conductivity water-permeable energy pile is characterized by comprising a concrete pile body, a reinforcement cage embedded in the concrete pile body and a heat exchange tube structure, wherein the heat exchange tube structure comprises a plurality of heat exchange tubes fixedly arranged on the reinforcement cage, a main water inlet pipeline connected with water inlets of the heat exchange tubes, a main water outlet pipeline connected with water outlets of the heat exchange tubes, a water inlet pipe connected with the main water inlet pipeline and a water outlet pipe connected with the main water outlet pipeline, the reinforcement cage is formed by concentrically arranging inner and outer cylindrical reinforcement cages, the heat exchange tubes are U-shaped heat exchange tubes, the U-shaped heat exchange tubes are uniformly distributed along the circumferential direction of the inner reinforcement cage and are arranged along the radial direction, the inner tubes of the U-shaped heat exchange tubes are fixed on the inner side of the inner reinforcement cage, the outer tubes of the U-shaped heat exchange tubes are fixed on the inner side of the outer reinforcement cage, the water outlets of the U-shaped heat exchange tubes are arranged on the upper ends of the outer tubes, the water inlets of the U-shaped heat exchange tubes are arranged on the inner tubes, and the main water inlet pipeline and the main water outlet pipeline are all annular pipelines.
2. The high thermal conductivity water permeable energy stake of claim 1, wherein: and the surface of the reinforcement cage is coated with antirust silver paint.
3. The manufacturing method of the high-heat-conductivity water-permeable energy pile is characterized by comprising the following steps of: step 1, fixing an inner pipe of the U-shaped heat exchange pipe as claimed in claim 2 on the inner side of an inner reinforcement cage, fixing an outer pipe of the U-shaped heat exchange pipe on the inner side of an outer reinforcement cage, connecting the inner pipe of the U-shaped heat exchange pipe with a main water inlet pipeline, connecting the outer pipe of the U-shaped heat exchange pipe with a main water outlet pipeline, inserting the inner reinforcement cage, the outer reinforcement cage and the U-shaped heat exchange pipe into pile holes together through a hoisting machine, and enabling gaps to be formed between the inner reinforcement cage, the outer reinforcement cage and the bottoms of the pile holes as well as between the inner reinforcement cage and the outer reinforcement cage and between the outer reinforcement cage and the side walls of the pile holes, wherein water inlet pipes and water outlet pipes which are correspondingly connected with the main water inlet pipeline and the main water outlet pipeline extend out of the pile body;
step 2, adding high-heat-conductivity water-heat-permeable concrete into the pile hole to form a pile body, and curing; the high-conductivity water-heat-permeable concrete is prepared by stirring the following components in parts by weight: 14.5 to 15.5 parts of water, 41 to 42 parts of cement, 150 to 155 parts of crushed stone, 2.5 to 7.9 parts of silicon carbide, 2.6 to 2.7 parts of reinforcing agent and 0.7 to 0.8 part of water reducer.
4. A method of manufacturing a highly thermally conductive water permeable energy stake as claimed in claim 3 wherein: the broken stone is limestone broken stone, and the grain size is 5-12 mm.
5. The method for manufacturing a high heat conduction water permeable pile according to claim 4, wherein: the water reducer is a naphthalene high-efficiency water reducer, the main component is beta sodium naphthalene sulfonate formaldehyde condensate, and the water reducing rate is 16% -22%.
6. The method for manufacturing the high-heat-conductivity water-permeable energy pile according to claim 5, wherein the method comprises the following steps: the silicon carbide is 1200-mesh green silicon carbide powder.
7. The method for manufacturing the high-heat-conductivity water-permeable energy pile according to claim 6, wherein: the reinforcing agent is SR ecological concrete reinforcing agent.
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