CN115059059B - High-performance energy anti-pulling pile - Google Patents
High-performance energy anti-pulling pile Download PDFInfo
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- CN115059059B CN115059059B CN202210734293.0A CN202210734293A CN115059059B CN 115059059 B CN115059059 B CN 115059059B CN 202210734293 A CN202210734293 A CN 202210734293A CN 115059059 B CN115059059 B CN 115059059B
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- heat exchange
- exchange tube
- pile
- tube
- calculating
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 3
- 239000010935 stainless steel Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/53—Methods for installation
-
- 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
Abstract
The invention discloses a high-performance energy anti-pulling pile, which is arranged at intervals between an anti-pulling pile and an energy anti-pulling pile below a foundation slab; a heat exchange tube made of stainless steel with fins is arranged in the energy anti-pulling pile, and the heat exchange tube is also used as a tension steel bar; under the condition of uneven temperature distribution, taking the range that the diameter of the periphery of the heat exchange tube is equal to three times of the diameter of the heat exchange tube as a calculating unit, and calculating the width of the crack: judging whether the width of the crack meets the standard limit value requirement, if not, adjusting the pipe diameter D or the wall thickness D of the heat exchange pipe until the standard requirement is met. The invention has the advantages that: the heat exchange efficiency of the energy pile is improved, and the economical efficiency of the energy pile system is greatly improved; and the cracks of the pile body are controlled, so that the safety of the building is ensured.
Description
Technical Field
The invention relates to the field of energy rock and soil, in particular to a uplift pile structure with a heat exchange function.
Background
In the urban updating process, along with the development of a large amount of underground space, under the condition of high anti-floating water level, anti-floating piles are often required to be arranged to meet the anti-floating safety requirements, such as rail transit stations, expressway tunnel inlets, large basements of houses or public buildings and the like.
The general anti-pulling pile has deeper burial depth and longer pile length, can be buried in a heat exchange pipeline to be transformed into a heat exchanger, and realizes the integrated application of underground space and energy by utilizing the clean energy of shallow geothermal energy in rock soil. But the following problems need to be solved:
(1) Further improving heat exchange efficiency
The heat exchange efficiency of the underground heat exchanger is limited by the thermal resistance of soil, the concrete pile body and the heat exchange tube, so that the heat exchange efficiency of the energy pile is improved, and the economical efficiency of the energy pile system can be improved.
(2) Control of pile body cracking
The pulling force transmitted to the pulling-resistant pile by the upper structure is resisted by friction between the pile body and the soil body, and the pile body generates tensile stress. The tensile stress of the pile body changes along with the fluctuation of the underground water level and changes along with the temperature effect generated in the heat exchange process. Under the long-term effect, the pile body is easy to crack, thereby causing the corrosion of the steel bars, causing the insufficient bearing capacity of the anti-pulling pile, and the pile fails in the service life of the building, which is also one of the main reasons that engineers keep a conservation attitude in the popularization process of the energy pile.
The crack of the pile body is generally controlled, and the width of the crack is proved to be not more than 0.2mm according to the axial tension member which is uniformly tensioned in the whole section according to the concrete structural design specification GB50010-2010 (2015 edition). And uneven stress distribution can be generated in the section of the pile body in the heat exchange process, so that a crack width calculation method under the working condition is lacking at present.
Disclosure of Invention
In order to solve the technical problems, the solution of the present invention includes:
(1) The heat exchange tube is changed from a common polyethylene tube (PE tube) to a heat exchange tube with fins, and the cross-sectional shape and the arrangement direction of the heat exchange tube are appointed in consideration of construction convenience;
(2) The heat exchange tube of the invention is also used as a tension steel bar, and the diameter D of the periphery of the heat exchange tube is taken under the condition of uneven temperature distribution 0 The range equal to three times of the diameter of the heat exchange tube is used as a calculating unit and provides a unit crack width w max Is calculated by the method;
the specific technical scheme is as follows:
the high-performance energy anti-pulling piles are arranged below the foundation slab at intervals; a heat exchange tube made of stainless steel with fins is arranged in the energy anti-pulling pile, and the heat exchange tube is also used as a tension steel bar; taking the peripheral diameter D of the heat exchange tube under the condition of uneven temperature distribution 0 The range equal to three times of the diameter D of the heat exchange tube is taken as a calculating unit, and the crack width w of the calculating unit is calculated according to the following method max ：
Step a, obtaining an initial ground temperature T through in-situ investigation 0 And assuming that the initial temperature of the pile body is equal to the initial ground temperature T 0 ；
Step b, calculating the temperature stress sigma of the heat exchange tube T ：
σ T ＝αE(T 0 -T 1 )；
α is the linear expansion coefficient of the heat exchange tube, taking α=1.05x10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E=200000 MPa is taken;
T 1 the temperature of the water is the water inlet temperature;
step c, calculating stress sigma of the heat exchange tube under the action of structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k The tensile force acting on the pile top surface under the standard combination of the load effect is shown;
G k representing the dead weight standard value of the pile, and deducting the buoyancy of water from the part below the stable underground water level;
ΣA s representing the sum of the cross-sectional areas of the tension bars in the piles, including heat exchange tubes;
step d, taking a calculation unit: the diameter of the calculating unit is D by taking the center of the heat exchange tube as the center of a circle 0 ：
D 0 ＝3D；
D is the diameter of the heat exchange tube;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating equivalent reinforcement area As in the unit:
A s ＝3Dd+π(D/2) 2 -π(D/2-d) 2
d is the wall thickness of the heat exchange tube;
step f. Calculating the cell crack width w max ：
Standard value sigma of tensile stress of heat exchange tube s ＝σ T +σ L
Calculating equivalent reinforcement ratio of heat exchange tubes in unitTime taking ρ te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr The axial center is taken as alpha according to the tension member for the stress characteristic coefficient of the member cr ＝2.7；
Psi is a strain non-uniform coefficient of the longitudinal tensile heat exchange tube between the cracks, and psi=1.0 is taken according to a component directly bearing repeated loads;
c s the distance from the outer edge of the heat exchange tube to the outer edge of the pile is in millimeters; when c s <20, taking 20; when c s >65, taking 65;
step g, crack width limit value w lim =0.2 mm, e.g. calculate crack width w max ≤w lim The standard requirement is met, and the design is finished; for example, calculating the crack width w max >w lim If the specification requirement is not met, the pipe diameter D or the wall thickness D of the heat exchange pipe needs to be adjusted, the step D is returned to for restarting the calculation until w max ≤w lim Until that point.
The three sides of the heat exchange tube are provided with fins, and the included angle between the fins is 90 degrees; the middle fins face the center of the pile, and the side of the heat exchange tube without fins is tightly attached to the stirrup.
The thickness of the fins is equal to the thickness D of the heat exchange tube wall, and the length of the fins is equal to the outer diameter D of the heat exchange tube.
The heat exchange tube is of a U-shaped structure, two vertical heat exchange tubes are a water inlet tube and a water outlet tube, fins are arranged on the outer sides of the water inlet tube and the water outlet tube, and the lower part of the water inlet tube is connected with the lower part of the water outlet tube through the U-shaped tube without the fins; the upper parts of the water inlet pipe and the water outlet pipe are respectively connected with the total water inlet pipe and the total water outlet pipe.
The invention has the advantages that:
the heat exchange efficiency of the energy pile is improved, and the economical efficiency of the energy pile system is greatly improved; and the cracks of the pile body are controlled, so that the safety of the building is ensured.
Drawings
FIG. 1 is a cross-sectional view of a building of the present invention;
FIG. 2 is a cross-sectional view of the C-C position of FIG. 1;
FIG. 3 is an elevation view of an energy uplift pile;
FIG. 4 is a cross-sectional view of the B-B position of FIG. 3;
FIG. 5 is a large sample of a metal heat exchange tube;
FIG. 6 is a schematic view in section A-A of FIG. 5;
FIG. 7 is a computational schematic;
fig. 8 is a block diagram of a calculation flow.
Detailed Description
The invention is specifically described below with reference to the accompanying drawings, and as shown in the drawings, under the foundation slab 3, the uplift pile 2 and the energy uplift pile 1 are arranged at intervals; a heat exchange tube with fins 24 is arranged in the energy anti-pulling pile 1 and comprises a water inlet tube 21 and a water outlet tube 22; the heat exchange tube is also used as a tension steel bar 5;
in the embodiment, the three sides of the heat exchange tube are provided with fins 24, the included angle between the fins is 90 degrees, and the fins can be adjusted according to the relation among the pile diameter, stirrups and fins; the thickness of the fins is equal to the thickness D of the heat exchange tube wall, and the length of the fins is equal to the outer diameter D of the heat exchange tube; when the heat exchange tube is arranged, the middle fins face the circle center of the pile, one side of the heat exchange tube without fins is tightly attached to the stirrup 6, the stirrup 6 is conveniently connected with the heat exchange tube, the heat exchange tube is of a U-shaped structure, two vertical heat exchange tubes are a water inlet tube 21 and a water outlet tube 22 respectively, fins 24 are arranged on the outer sides of the water inlet tube and the water outlet tube, and the lower part of the water inlet tube is connected with the lower part of the water outlet tube through a U-shaped tube 23 without fins; the upper parts of the water inlet pipe and the water outlet pipe are respectively connected with a total water inlet pipe 41 and a total water outlet pipe 42, and the total water inlet pipe 41 and the total water outlet pipe 42 form a main pipe 4;
the fin 24 is provided to increase the contact area between the heat exchange tube and the concrete and to increase the heat exchange efficiency;
the heat exchange tube of the invention is also used as a tension steel bar, and the diameter D of the periphery of the heat exchange tube is taken under the condition of uneven temperature distribution 0 The range equal to three times of the diameter D of the heat exchange tube is taken as a calculating unit, and the crack width w of the calculating unit is calculated according to the following method max ：
Step a, obtaining an initial ground temperature T through in-situ investigation 0 And assuming that the initial temperature of the pile body is equal to the initial ground temperature T 0 ；
Step b, calculating the temperature stress sigma of the heat exchange tube T ：
σ T ＝αE(T 0 -T 1 )；
α is the linear expansion coefficient of the heat exchange tube, taking α=1.05x10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E=200000 MPa is taken;
T 1 the temperature of the water is the water inlet temperature;
step c, calculating stress sigma of the heat exchange tube under the action of structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k The tensile force acting on the pile top surface under the standard combination of the load effect is shown;
G k representing the dead weight standard value of the pile, and deducting the buoyancy of water from the part below the stable underground water level;
ΣA s representing the sum of the cross-sectional areas of the tension bars in the piles, including heat exchange tubes;
step d, taking a calculation unit: the diameter of the calculating unit is D by taking the center of the heat exchange tube as the center of a circle 0 ：
D 0 ＝3D；
D is the diameter of the heat exchange tube;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating equivalent reinforcement area As in the unit:
A s ＝3Dd+π(D/2) 2 -π(D/2-d) 2
d is the wall thickness of the heat exchange tube;
step f. Calculating the cell crack width w max ：
Standard value sigma of tensile stress of heat exchange tube s ＝σ T +σ L
Calculating equivalent reinforcement ratio of heat exchange tubes in unitTime taking ρ te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr The axial center is taken as alpha according to the tension member for the stress characteristic coefficient of the member cr ＝2.7；
Psi is a strain non-uniform coefficient of the longitudinal tensile heat exchange tube between the cracks, and psi=1.0 is taken according to a component directly bearing repeated loads;
c s the distance from the outer edge of the heat exchange tube to the outer edge of the pile is in millimeters; when c s <20, taking 20; when c s >65, taking 65;
step g, crack width limit value w lim =0.2 mm, e.g. calculate crack width w max ≤w lim The standard requirement is met, and the design is finished; for example, calculating the crack width w max >w lim If the specification requirement is not met, the pipe diameter D or the wall thickness D of the heat exchange pipe needs to be adjusted, and the process returns to the step D to restart the meteringCalculating until w max ≤w lim Until that point.
Claims (4)
1. High performance energy anti-floating pile, its characterized in that: the anti-pulling piles and the energy anti-pulling piles are arranged at intervals below the foundation slab; a heat exchange tube made of stainless steel with fins is arranged in the energy anti-pulling pile, and the heat exchange tube is also used as a tension steel bar; taking the peripheral diameter D of the heat exchange tube under the condition of uneven temperature distribution 0 The range equal to three times of the diameter D of the heat exchange tube is taken as a calculating unit, and the crack width w of the calculating unit is calculated according to the following method max ：
Step a, obtaining an initial ground temperature T through in-situ investigation 0 And assuming that the initial temperature of the pile body is equal to the initial ground temperature T 0 ；
Step b, calculating the temperature stress sigma of the heat exchange tube T ：
σ T ＝αE(T 0 -T 1 )；
α is the linear expansion coefficient of the heat exchange tube, taking α=1.05x10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E=200000 MPa is taken;
T 1 the temperature of the water is the water inlet temperature;
step c, calculating stress sigma of the heat exchange tube under the action of structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k The tensile force acting on the pile top surface under the standard combination of the load effect is shown;
G k representing the dead weight standard value of the pile, and deducting the buoyancy of water from the part below the stable underground water level;
ΣA s representing the sum of the cross-sectional areas of the tension bars in the piles, including heat exchange tubes;
step d, taking a calculation unit: the diameter of the calculating unit is D by taking the center of the heat exchange tube as the center of a circle 0 ：
D 0 ＝3D；
D is the diameter of the heat exchange tube;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating equivalent reinforcement area As in the unit:
A s ＝3Dd+π(D/2) 2 -π(D/2-d) 2
d is the wall thickness of the heat exchange tube;
step f. Calculating the cell crack width w max ：
Standard value sigma of tensile stress of heat exchange tube s ＝σ T +σ L
Calculating equivalent reinforcement ratio of heat exchange tubes in unitρ te Taking ρ when < 0.01 te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr The axial center is taken as alpha according to the tension member for the stress characteristic coefficient of the member cr ＝2.7；
Psi is a strain non-uniform coefficient of the longitudinal tensile heat exchange tube between the cracks, and psi=1.0 is taken according to a component directly bearing repeated loads;
c s the distance from the outer edge of the heat exchange tube to the outer edge of the pile is in millimeters; when c s <20, taking 20; when c s >65, taking 65;
step g, crack width limit value w lim =0.2 mm, e.g. calculate crack width w max ≤w lim The standard requirement is met, and the design is finished; for example, calculating the crack width w max >w lim If the specification requirement is not met, the pipe diameter D or the wall thickness D of the heat exchange pipe needs to be adjusted, the step D is returned to for restarting the calculation until w max ≤w lim Until that point.
2. The high performance energy uplift pile of claim 1 wherein: the three sides of the heat exchange tube are provided with fins, and the included angle between the fins is 90 degrees; the middle fins face the center of the pile, and the side of the heat exchange tube without fins is tightly attached to the stirrup.
3. The high performance energy uplift pile of claim 2 wherein: the thickness of the fins is equal to the thickness D of the heat exchange tube wall, and the length of the fins is equal to the outer diameter D of the heat exchange tube.
4. The high performance energy uplift pile of claim 2 wherein: the heat exchange tube is of a U-shaped structure, two vertical heat exchange tubes are a water inlet tube and a water outlet tube, fins are arranged on the outer sides of the water inlet tube and the water outlet tube, and the lower part of the water inlet tube is connected with the lower part of the water outlet tube through the U-shaped tube without the fins; the upper parts of the water inlet pipe and the water outlet pipe are respectively connected with the total water inlet pipe and the total water outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734293.0A CN115059059B (en) | 2022-06-27 | 2022-06-27 | High-performance energy anti-pulling pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734293.0A CN115059059B (en) | 2022-06-27 | 2022-06-27 | High-performance energy anti-pulling pile |
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| Publication Number | Publication Date |
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| CN115059059A CN115059059A (en) | 2022-09-16 |
| CN115059059B true CN115059059B (en) | 2024-04-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1163314A (en) * | 1997-08-22 | 1999-03-05 | Nippon Concrete Ind Co Ltd | Reinforced concrete pile |
| CN107727032A (en) * | 2017-10-23 | 2018-02-23 | 苏交科集团股份有限公司 | One kind measures accurately intelligent tunnel slot tilted object equipment |
| JP2018145790A (en) * | 2018-05-23 | 2018-09-20 | ジャパンパイル株式会社 | Design method of pile head joint and allowable bending moment calculation method |
| CN111382910A (en) * | 2020-03-16 | 2020-07-07 | 上海大学 | Analysis method of optimization model based on club-footed uplift pile |
-
2022
- 2022-06-27 CN CN202210734293.0A patent/CN115059059B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1163314A (en) * | 1997-08-22 | 1999-03-05 | Nippon Concrete Ind Co Ltd | Reinforced concrete pile |
| CN107727032A (en) * | 2017-10-23 | 2018-02-23 | 苏交科集团股份有限公司 | One kind measures accurately intelligent tunnel slot tilted object equipment |
| JP2018145790A (en) * | 2018-05-23 | 2018-09-20 | ジャパンパイル株式会社 | Design method of pile head joint and allowable bending moment calculation method |
| CN111382910A (en) * | 2020-03-16 | 2020-07-07 | 上海大学 | Analysis method of optimization model based on club-footed uplift pile |
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| CN115059059A (en) | 2022-09-16 |
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