CN115059059A - High-performance energy uplift pile - Google Patents
High-performance energy uplift pile Download PDFInfo
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- CN115059059A CN115059059A CN202210734293.0A CN202210734293A CN115059059A CN 115059059 A CN115059059 A CN 115059059A CN 202210734293 A CN202210734293 A CN 202210734293A CN 115059059 A CN115059059 A CN 115059059A
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- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 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 45
- 238000000034 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
- 239000002689 soil Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 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
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Sustainable Development (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Energy (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a high-performance energy uplift pile, wherein the uplift pile and the energy uplift pile are arranged at intervals below a foundation slab; a stainless steel heat exchange tube with fins is arranged in the energy uplift pile, and the heat exchange tube is also used as a tension steel bar; under the condition of uneven temperature distribution, taking the range of the peripheral diameter of the heat exchange tube equal to three times of the diameter of the heat exchange tube as a calculation unit, and calculating the width of a crack: and judging whether the crack width meets the requirement of the specification limit value, if not, adjusting the pipe diameter D or the wall thickness D of the heat exchange pipe until the crack width meets the requirement of the specification limit value. 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, and the safety of the building is ensured.
Description
Technical Field
The invention relates to the field of energy rock soil, in particular to an uplift pile structure with a heat exchange function.
Background
In the urban updating process, along with the development of a large number of underground spaces, 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 of rail transit stations, express way tunnel inlets, large basements of houses or public buildings and the like.
The general uplift pile is deeper in buried depth and longer in pile length, can be buried in a heat exchange pipeline to be transformed into a heat exchanger, and utilizes clean energy of shallow geothermal energy in a rock soil body to realize integrated application of underground space and energy. However, the following problems need to be solved:
(1) further improve the heat exchange efficiency
The heat exchange efficiency of the underground heat exchanger is limited by the thermal resistance of soil, a concrete pile body and a heat exchange pipe, so that the heat exchange efficiency of the energy pile is improved, and the economical efficiency of an energy pile system can be improved.
(2) Controlling pile body cracks
The friction between the pile body and the soil body is utilized by the uplift pile to resist the pulling force transmitted from the upper structure to the uplift pile, and the pile body generates the tensile stress. The size of 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 action, the pile body is easy to crack, so that the corrosion of steel bars is caused, the uplift bearing capacity of the uplift pile is insufficient, the uplift pile fails within the service life of a building, and the uplift pile is one of the main reasons for maintaining the conservative attitude of engineers in the process of popularizing the energy pile.
Generally controlling the crack of the pile body, and checking that the crack width is not more than 0.2mm according to an axis tension member with uniformly tensioned full section according to concrete structure design specification GB50010-2010(2015 edition). Uneven stress distribution can be generated in the section of the pile body in the heat exchange process, and a crack width calculation method under the working condition is lacked at present.
Disclosure of Invention
In order to solve the above technical problem, 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 section shape and the arrangement direction of the heat exchange tube are specified in consideration of construction convenience;
(2) the heat exchange tube of the invention is used as a tension steel bar, and the peripheral diameter D of the heat exchange tube is taken under the condition of uneven temperature distribution 0 The range of the diameter of the heat exchange tube which is equal to three times is a calculation unit, and the crack width w of the unit is provided max The calculation method of (1);
the specific technical scheme is as follows:
the high-performance energy uplift pile is arranged below the foundation bottom plate at intervals; a stainless steel heat exchange tube with fins is arranged in the energy uplift 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 of the diameter D of the heat exchange tube which is equal to three times is used as a calculation unit, and the crack width w of the 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 )；
Alpha is linear expansion coefficient of the heat exchange tube, and alpha is 1.05 x 10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E is 200000 MPa;
T 1 the temperature of the inlet water is set;
step c, calculating the stress sigma of the heat exchange tube under the structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k Representing the tensile force acting on the top surface of the pile under the standard combination of the load effect;
G k representing a dead weight standard value of the pile, and deducting the buoyancy of water for the part below the stable underground water level;
ΣA s the sum of the cross section areas of the tensioned steel bars in the pile is represented, and the pile comprises a heat exchange pipe;
step d, taking a calculation unit: the diameter of the calculation unit is D by taking the center of the heat exchange tube as the circle center 0 ：
D 0 ＝3D；
D is the pipe diameter of the heat exchange pipe;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating the 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 width w of the unit crack 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 unit
Taking rho by time te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr For the characteristic coefficient of the member's force, where the axis is in the direction of the tensile memberTake alpha cr ＝2.7；
Psi is the uneven coefficient of the strain of the longitudinally-tensioned heat exchange tube among the cracks, and psi is 1.0 according to a member directly bearing repeated load;
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 is going to s <20, taking 20; when c is s >When 65, 65 is taken;
step g. crack width limit w lim 0.2mm, e.g. calculating the crack width w max ≤w lim If so, meeting the standard requirement and finishing the design; e.g. calculating the crack width w max >w lim If the tube diameter D or the wall thickness D of the heat exchange tube does not meet the specification requirement, the tube diameter D or the wall thickness D of the heat exchange tube needs to be adjusted, the step D is returned to, and calculation is restarted until the w is reached max ≤w lim Until now.
The heat exchange tube is provided with fins on three sides, and the included angle between the fins is 90 degrees; the middle fin faces to the center of the pile, and one side of the heat exchange tube without the fins is placed close to the stirrup.
The thickness of the fin is equal to the thickness D of the heat exchange tube wall, and the length of the fin is equal to the outer diameter D of the heat exchange tube.
The heat exchange tubes are of a U-shaped structure, the two vertical heat exchange tubes are respectively 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 a U-shaped tube without the fins; the upper parts of the water inlet pipe and the water outlet pipe are respectively connected with the main water inlet pipe and the main 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, and 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 taken at the position C-C of FIG. 1;
FIG. 3 is an elevation view of an energy uplift pile;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 5 is a schematic view of a metal heat exchange tube;
FIG. 6 is a schematic sectional view taken along line A-A of FIG. 5;
FIG. 7 is a simplified calculation diagram;
fig. 8 is a block diagram of a calculation flow.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, in which uplift piles 2 and energy uplift piles 1 are arranged at intervals below a foundation slab 3 as shown in the drawings; a heat exchange tube with fins 24 is arranged in the energy uplift 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 heat exchange tube of the heat exchange tube is provided with fins 24 on three sides, the included angle between the fins is 90 degrees, and the heat exchange tube can be adjusted according to the relation among the pile diameter, the stirrups and the fins; the thickness of the fin is equal to the thickness D of the heat exchange tube wall, and the length of the fin is equal to the outer diameter D of the heat exchange tube; when the heat exchange tube is arranged, the middle fin faces the center of the pile, one side of the heat exchange tube without fins is placed to be 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, the two vertical heat exchange tubes are a water inlet tube 21 and a water outlet tube 22 respectively, the outer sides of the water inlet tube and the water outlet tube are provided with fins 24, 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 main water inlet pipe 41 and a main water outlet pipe 42, and the main water inlet pipe 41 and the main water outlet pipe 42 form a main trunk pipe 4;
the fin 24 is arranged for increasing the contact area between the heat exchange tube and concrete and improving the heat exchange efficiency;
the heat exchange tube of the invention is used as a tension steel bar, and the peripheral diameter D of the heat exchange tube is taken under the condition of uneven temperature distribution 0 The range of the diameter D of the heat exchange tube which is equal to three times is used as a calculation unit, and the crack width w of the 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 )；
Alpha is linear expansion coefficient of the heat exchange tube, and alpha is 1.05 x 10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E is 200000 MPa;
T 1 the temperature of the inlet water is set;
step c, calculating the stress sigma of the heat exchange tube under the structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k Representing the tensile force acting on the top surface of the pile under the standard combination of the load effect;
G k representing a dead weight standard value of the pile, and deducting the buoyancy of water for the part below the stable underground water level;
ΣA s the sum of the cross section areas of the tensioned steel bars in the pile is represented, and the pile comprises a heat exchange pipe;
step d, taking a calculation unit: the diameter of the unit is calculated to be D by taking the center of the heat exchange tube as the circle center 0 ：
D 0 ＝3D；
D is the pipe diameter of the heat exchange pipe;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating the 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 width w of the unit crack 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 unit
Taking rho by time te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr For the characteristic coefficient of the member under load, where the axis is taken as alpha for the tensile member cr ＝2.7；
Psi is the uneven coefficient of the longitudinal tension heat exchange tube strain among cracks, and psi is 1.0 according to a component directly bearing repeated load;
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 is going to s <20, taking 20; when c is going to s >When 65, 65 is taken;
step g. crack width limit w lim 0.2mm, e.g. calculating the crack width w max ≤w lim If so, meeting the standard requirement and finishing the design; e.g. calculating the crack width w max >w lim If the tube diameter D or the wall thickness D of the heat exchange tube does not meet the specification requirement, adjusting the tube diameter D or the wall thickness D of the heat exchange tube, returning to the step D, and restarting to calculate until the value w is max ≤w lim Until now.
Claims (4)
1. High performance energy uplift pile, its characterized in that: the uplift piles and the energy uplift piles are arranged at intervals below the foundation bottom plate; a stainless steel heat exchange tube with fins is arranged in the energy uplift 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 of the diameter D of the heat exchange tube which is equal to three times is used as a calculation unit, and the crack width w of the 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 )；
Alpha is linear expansion coefficient of the heat exchange tube, and alpha is 1.05 x 10 -5 /℃；
E is the elastic modulus of the heat exchange tube, and E is 200000 MPa;
T 1 the temperature of the inlet water is set;
step c, calculating the stress sigma of the heat exchange tube under the structural load L ：
σ L ＝(F k -G k )/ΣA s ；
F k The tensile force acting on the top surface of the pile under the standard combination of the load effect is shown;
G k representing a dead weight standard value of the pile, and deducting the buoyancy of water for the part below the stable underground water level;
ΣA s the sum of the cross section areas of the tensioned steel bars in the pile is represented, and the pile comprises a heat exchange pipe;
step d, taking a calculation unit: the diameter of the unit is calculated to be D by taking the center of the heat exchange tube as the circle center 0 ：
D 0 ＝3D；
D is the pipe diameter of the heat exchange pipe;
calculating the unit area A:
A＝ π *(D 0 /2)*(D 0 /2)；
step e, calculating the 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 width w of the unit crack 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 unit
ρ te Taking rho when < 0.01 te ＝0.01
Calculating equivalent diameter of heat exchange tube in unit
α cr For the characteristic coefficient of the member under load, where the axis is taken as alpha for the tensile member cr ＝2.7；
Psi is the uneven coefficient of the strain of the longitudinally-tensioned heat exchange tube among the cracks, and psi is 1.0 according to a member directly bearing repeated load;
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 is going to s <20, taking 20; when c is going to s >When 65, 65 is taken;
step g. crack width limit w lim 0.2mm, e.g. calculating the crack width w max ≤w lim If so, meeting the standard requirement and finishing the design; e.g. calculating the crack width w max >w lim If the tube diameter D or the wall thickness D of the heat exchange tube does not meet the specification requirement, the tube diameter D or the wall thickness D of the heat exchange tube needs to be adjusted, the step D is returned to, and calculation is restarted until the w is reached max ≤w lim Until now.
2. The high performance energy uplift pile according to claim 1, wherein: the heat exchange tube is provided with fins on three sides, and the included angle between the fins is 90 degrees; the middle fin faces to the center of the pile, and one side of the heat exchange tube without the fins is placed close to the stirrup.
3. The high performance energy uplift pile according to 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 according to claim 2, wherein: the heat exchange tube is of a U-shaped structure, the two vertical heat exchange tubes are a water inlet tube and a water outlet tube respectively, 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 a U-shaped tube without fins; the upper parts of the water inlet pipe and the water outlet pipe are respectively connected with the main water inlet pipe and the main 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 |
Applications Claiming Priority (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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| CN115059059A true CN115059059A (en) | 2022-09-16 |
| CN115059059B 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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| CN115059059B (en) | 2024-04-12 |
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