CN109097782A - A kind of spiral ground pile anti-corrosion protection system and its application method - Google Patents
A kind of spiral ground pile anti-corrosion protection system and its application method Download PDFInfo
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- CN109097782A CN109097782A CN201811245780.0A CN201811245780A CN109097782A CN 109097782 A CN109097782 A CN 109097782A CN 201811245780 A CN201811245780 A CN 201811245780A CN 109097782 A CN109097782 A CN 109097782A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/10—Electrodes characterised by the structure
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- Prevention Of Electric Corrosion (AREA)
Abstract
The present invention relates to a kind of spiral ground pile anti-corrosion protection system and its application methods; it includes sacrificial anode and spiral ground pile that spiral ground pile, which protects system, and the sacrificial anode includes anode bodies, and the anode bodies and spiral ground pile are electrically connected; the anode bodies are anode, and the spiral ground pile is cathode.The present invention has expanded the application range of Steel coil ground pile, can protect spiral ground pile for a long time, spiral ground pile is prevented to be corroded, and cost performance is high, and energy conservation and environmental protection realizes the recyclable value truly of spiral ground pile.
Description
Technical field
The present invention relates to a kind of spiral ground pile anti-corrosion protection system and its application methods.
Background technique
China vigorously advocates the development of clean energy resource at present, and wherein photovoltaic energy has pollution-free, noiseless, maintenance cost
It the advantages that low, long service life, is developed rapidly in recent years.The photovoltaic panel bracket basis work in photovoltaic plant construction project
Journey is particularly important, and land photovoltaic plant mostly uses traditional concrete foundation at present, but concrete foundation has many restriction conditions:
First is that needing enough curing times, long construction period after concreting；Second is that concrete foundation needs biggish water consumption；
Third is that concrete foundation needs biggish working face, and the earthwork evacuation of large area not only causes permanently surface vegetation
It destroys and the ecological balance and water and soil conservation can be had some impact on, especially earth's surface is broken after photovoltaic plant lifetime
It is bad irrecoverable, it cannot reuse.
Steel coil ground pile also known as screw anchor or Pseudobulbus Bletillae (Rhizoma Bletillae).Its working principle is equal to self-tapping screw, by the spiral shell of its own
Soil " attack-bore, squeeze, press " is gone out corresponding screw thread, is allowed to mutually be fitted close by line.The appearance of spiral ground pile compensates for above-mentioned
Many deficiencies of concrete foundation, advantage are very prominent: construction climate influence is small, and installation speed is fast, no curing period, construction
Period greatly shortens, and has saved engineering cost；Water source usage amount is zero, falls below minimum to the extent of the destruction of surface vegetation, more
It is to reduce soil erosion to the maximum extent；Spiral ground pile can extract Reusability after the completion of use, without excavating and handling
Surflaes, it is free from environmental pollution, it is environmentally protective, and can be greatly improved the land utilization efficiency after the lifetime of power station.Spiral shell at present
Photovoltaic plant starts to obtain rapid proliferation rotation ground pile at home.In addition, spiral ground pile is also widely used for house, log cabin, light steel
Structural construction basis, wooden footway, billboard, bus stop board, electric tower, railway, highway, stadium, substation, family's grid
The installation on the basis such as column, guardrail, the basis of fence and photovoltaic solar, Solar lamp, street lamp, building construction, amusement facility.
But the corrosion resistance of Steel coil ground pile is poor to constrain its application range significantly, especially in severe soil
In corrosive environment (such as coastal region, inland varieties in saline-alkali areas, moist lowered zones etc.), Steel coil ground pile can be by difference
The electrochemical corrosion of degree, to influence its whole design service life and service performance.The anticorrosion of Steel coil ground pile is arranged at present
Applying is physics coating protection, there is hot dip spelter coating and two kinds of epoxy coating.
Hot dip spelter coating is simple, at low cost because of its processing technology, it has also become Steel coil ground pile is widely used anti-at present
Corrosion measure, the common galvanized layer thickness of spiral ground pile are 80 μm.The general design of photovoltaic power station service life is 30 years, in some strong corruption
Erosion area, the anticorrosive measure of 80 μm of galvanizing coatings of spiral ground pile are far from meeting projected life and requirement.If
Increase the thickness of spiral ground pile galvanizing coating to 200 μm of (maximum gauges that spiral ground pile zinc coat allows at present, if thickness is super
200 μm are crossed, zinc coat is easy to fall off from spiral ground pile surface).
Epoxy coating it is very fine and close and can with spiral ground pile surface uniformly it is good fit together, if intact epoxy
Its Corrosion Protection of coating is extraordinary；But since its plasticity is poor, brittleness is big, ground operation process is screwed into spiral ground pile
In, there is powerful torsional forces to act on screw thread on piece, causes the epoxy coating on screw thread piece periphery (especially edge) in stress
Non-plastic fracture is easy under state to collapse out, and is occurred seriously in soil corrosion medium so as to cause screw thread piece plain steel is exposed
Local corrosion makes the general corrosion protection effect of spiral ground pile have a greatly reduced quality, and screw thread piece is as the load bearing master of spiral ground pile
Structure is wanted, as the extension screw thread piece local corrosion area of time is increasing, screw thread piece corrosion failure (especially exists over time
Deep-etching area), influence entire pile foundation stress and stability.Furthermore on Steel coil ground pile surface, spraying epoxy coating processes work
Skill is relative complex and cost is very high, and the cost advantage of spiral ground pile is lost compared with traditional concrete pipe base, is prevented in addition
Corrosive effect is general, and overall cost-effective performance is not high, and epoxy coating spiral ground pile is in addition in few specific soft soil foundation environment at present
Using outer (it is small to epoxy coating destructiveness to screw soft soil foundation in operation process in spiral ground pile), it is rarely employed on the market.
As the corrosion rate of the increase soil of water content, salt content, acidity and basicity in soil is continuously increased, wherein
Total salinity and acidity are affected to soil corrosivity, and especially many coastal region soil water-containings, salt content are relatively rich
Richness, belongs to strong corrosive soil, for example, Tianjin Dagang area galvanized steel corrosion rate in 20 μm/a~23 μm/a, in this area
Just corrode depleted in anti-corrosion galvanizing coating 3~4 years of 80 μm of spiral ground pile.In addition, for highly acid and strong basicity area (one
As for, when the pH value of soil is strongly acidic soil less than 5, being greater than 8.5 is strong basicity soil, between 6.5~7.5 is
Property soil), soil corrosivity is also very fierce, equally to only take physics coating antiseptic erosion measure Steel coil ground pile design
Service life causes to seriously threaten.
Therefore, seek a kind of long-acting corrosion protection method of Steel coil ground pile, it can not only with effectively extending Steel coil
Service life of the stake in deep-etching area (coastal region, inland salt-soda soil, strong acid and highly basic area, moist lowered zones etc.) is full
Sufficient design requirement, and cost performance is high, promotes spiral ground pile widely, it is extremely urgent.
Summary of the invention
Present invention seek to address that the above problem, a kind of spiral ground pile anti-corrosion protection system and its application method are provided,
It is limited to solve the problems, such as that spiral ground pile uses in severe soil corrosion environment, solving spiral ground pile can not be weighed by corrosion
The problem of utilizing again solves the problems, such as that the etch-proof guard time of existing spiral ground pile is short, is easy to be corroded.
A kind of spiral ground pile anti-corrosion protection system characterized by comprising sacrificial anode and spiral ground pile, it is described sacrificial
Domestic animal anode includes anode bodies, and the anode bodies and spiral ground pile are electrically connected, and the anode bodies are anode, and the spiral ground pile is
Cathode.
Preferably, the oxidisability of the anode bodies is stronger than spiral ground pile.
Preferably, the sacrificial anode further includes anode cable, seal nipple, iron core, cloth bag and filler material, the anode
Body is set in cloth bag, and anode bodies are simultaneously wrapped in wherein, the one of the anode cable by the inner cavity of the filler material filling cloth bag
End is connected by seal nipple with anode bodies, and the other end is pierced by cloth bag and connect with spiral ground pile；The seal nipple is detachable
It is connected on anode bodies, the sack of the cloth bag tightens.
It preferably, further include bracket, several spiral ground piles and a sacrificial anode form a unit, the spiral ground pile
Protection system includes several units, and all spiral ground piles in a unit are electrically connected by bracket.
Preferably, the sacrificial anode in a unit and each spiral ground pile are equidistant.
Preferably, the spiral ground pile surface is provided with corrosion-resistant coating.
A kind of spiral ground pile anti-corrosion protection systematic difference method, which comprises the following steps:
Step 1): selection anode bodies material；
Step 2): the specification of anode bodies is selected；
Step 3): the quantity N for the spiral ground pile that single branch anode bodies can protect is calculated；
Step 4): installation of sacrifice anode；
Step 5): test galvanic anode protection anticorrosion ability: after sacrificial anode Embedded installation, to spirally
Cathodic protection effect carries out test evaluation, if spiral ground pile cathodic protection potential, which touches the mark, illustrates spiral ground pile electrochemistry
Corrosion has obtained good inhibition, completes installation；If spiral ground pile cathodic protection potential does not touch the mark, need to add
The dosage of embedded anode bodies is until reach protecting effect.
Preferably, step 1) is that numerical value selection is surveyed according to soil resistivity at the earth's surface depth 1.5m of construction site: working as soil
Resistivity 10 Ω m and it is following when, using kirsite as anode bodies；When soil resistivity is more than 10 Ω m, use
Magnesium alloy is as anode bodies.
Preferably, step 2) is deep according to spiral ground pile design service life Y (generally 30 years) and construction site earth's surface
Soil resistivity exploration numerical value ρ is designed the weight G and its specification size for calculating and determining anode bodies at 1.5m.Generally by
Professional designer will likely rule of thumb meet design service life several specifications and models anode bodies substitute into below A.1,
A.2, A.3 in calculation formula, by calculating selected meet and closest to the specifications and models anode bodies of design service life.
Single branch anode bodies ground resistance R is calculated by formula (A.1):
The mono- branch anode bodies ground resistance of R-, Ω in formula；
Electric resistance of soil rate score at ρ-construction site earth's surface deep 1.5, Ω m；
L-anode body length, m；
L1-cloth bag, m；
D1-cloth bag diameter, m；
D-anode bodies equivalent diameter, m；
T-anode bodies center ground height, takes 1.5m.
The electric current If that single branch anode bodies occur is calculated by formula (A.2):
I in formulafThe current values that-mono- branch anode bodies occur, A；
Δ E-anode bodies drive current potential, V；Magnesium alloy anode takes Δ E=0.65V
Zinc alloy anode takes Δ E=0.25V.
R-anode bodies ground resistance, Ω；
Anode bodies projected life Y is calculated, and is calculated by formula (A.3):
Y-anode bodies projected life, a in formula；
The mono- branch anode bodies nt wt net weight of G-, Kg；
Q-anode bodies actual capacitance, magnesium alloy anode Q=1100Ah/kg,
Zinc alloy anode Q=780Ah/kg；
1/K-anode bodies usage factor, value 0.85；
ImThe average generation electric current of-every anode bodies, A；Im=(0.6~0.8) If。
Preferably, the spiral ground pile quantity N that the single branch anode bodies of step 3) can be protected is calculated:
The spiral ground pile quantity that the mono- branch anode bodies of N-can be protected in formula, branch, round number；
IfThe magnitude of current, A occur for-anode bodies；
I-protecting current density, by following regulation value；
S-project selectes the surface area of model spiral ground pile, m2；
1) as follows for carbon steel and zinc-plated carbon steel coil ground pile, protecting current density i value:
1. soil resistivity 20 Ω m and it is following when, current density be greater than 20mA/m2；
2. soil resistivity (20~50) Ω m and it is following when, current density takes (10~20) mA/m2；
3. soil resistivity is more than 50 Ω m, current density takes 10mA/m2；
2) when pH value is less than 4.5, the corrosivity of soil enhances, and should increase protecting current density in conjunction with situation；
3) there are the soil environments of sulfate reducing bacteria, should increase current density in conjunction with situation；
4) current density is protected using the spiral ground pile yin for reinforcing grade coating (such as epoxy coating) and takes (2~3) mA/m2；
Preferably, step 4) is specific as follows: sacrificing firstly, being determined according to the quantity N of the calculated spiral ground pile of step 3)
Sacrificial anode is arranged in the intermediate appropriate location of this N branch spiral ground pile, wherein most ideal by the burial place of anode as far as possible herein
Arrangement protect spiral ground pile is equidistant to be evenly arranged with it by sacrificial anode；Secondly, in fixed sacrificial anode
Burial place slots or drills through its Embedded installation operation dell, makes 1.5 meters far from ground of sacrificial anode center；By sacrificial anode
Filler material is impregnated with to its watering after placement, and is backfilled after reaching saturation, while anode cable is drawn into ground；Again, in sun
Pole cable end piece crimps copper lug, and copper lug is securely attached to together by bolt and the one of spiral ground pile in periphery,
The bracket 6 of same row's photovoltaic panel 7 all mutually overlaps in photovoltaic plant, and it is all mutual that they, which are between an entirety,
Conduct, and 2 top of spiral ground pile is connect with bracket 6, between be also to be electrically connected with each other, therefore anode cable only needs and it
One, periphery spiral ground pile is electrically connected, and mutually conducting between other spiral ground piles of periphery is just realized, to protect
Periphery others spiral ground pile；Finally, carrying out anti-corrosion using anticorrosive paint in bolt crimping copper lug position, anode cable is buried
It is good, restore ground.
Preferably, step 5) is specific as follows: sacrificial anode Embedded installation finishes, and carries out to spiral ground pile cathodic protection effect
Test evaluation should meet one of following index: under normal circumstances, spiral ground pile cathodic protection potential (i.e. metal component/ground interface
Current potential) it should be -850mV (CSE) or more negative；In special circumstances, when -850mV criterion is difficult to reach, cathodic polarization can be used
Or depolarising potential difference is greater than the criterion of 100mV.Spiral ground pile cathodic protection potential reaches the above index and illustrates spiral ground pile electricity
Chemical attack has obtained good inhibition, and anticorrosion ability is ideal.If not up to These parameters, additional embedded anode bodies are needed
Dosage until reach protecting effect.
Preferably, during sacrificial anode is moved and buried, lifting anode cable is not allowed, to avoid seal nipple fracture；
Sacrificial anode filler material pours water saturates before embedded；Sacrificial anode cable should at least stop 10% flexible surplus, to prevent under soil
Cable is broken when heavy, general anode cable is to 2.5 meters of the youthful and the elderly.
The present invention has the advantage that
(1) application range of Steel coil ground pile has been expanded, spiral ground pile can be protected for a long time, has prevented spiral ground pile quilt
Corrosion.
In severe soil corrosion environment (such as coastal region, inland varieties in saline-alkali areas, strong acid and highly basic area, humidity
Lowered zones etc.) it is required using the projected life that traditional physics coating antiseptic erosion measure is unable to satisfy Steel coil ground pile, pole
Constrain spiral ground pile in the application in these areas greatly.In typical salinized soil matter area, soil corrosivity is very strong, traditional hot dip
Spelter coating 4 to 5 years is just depleted, far from meeting the service life requirement in 30 years of spiral ground pile conventional design.Using sacrificial
It is anti-that the guard method of domestic animal anode cathode can carry out long-term, effective corrosion to the Steel coil ground pile in deep-etching soil environment
Shield, and protect the service life can flexible design acording to the requirement of user, can be required with 0 to 50 years even longer service lifes equal
It can be achieved.
(2) cost performance is high, and energy conservation and environmental protection realizes the recyclable value of spiral ground pile.
Apply the spiral ground pile of galvanic anode protection measure, the spiral ground pile of opposite conventional physical coating antiseptic measure
Cost increase about 1/5, cost and conventional cement concrete pipe base cost are similar (slightly lower), but Steel coil
Ground pile short construction period, energy conservation and environmental protection, other advantages such as to can be recycled be that conventional cement pile foundation is incomparable.In addition,
Some deep-etching areas are to be unable to satisfy design service life requirement using the spiral ground pile of conventional physical coating antiseptic erosion measure
, it is necessary to apply galvanic anode protection anticorrosive measure and be just able to satisfy its design service life requirement, increases by 1/5 cost
Cost substantially prolongs the service life of spiral ground pile, can apply in former non-serviceable area.To spiral ground pile
Apply and design reasonable galvanic anode protection measure, but obtains spiral ground pile matrix surface within the service life period
Good corrosion protection can also ensure the opposite of spiral ground pile surface texture (after 30 years) even if after the power station service life expires
Integrity, user can extract recycling after spiral ground pile Reusability or producer's recycling simple process, energy saving and environmentally friendly.
And the Steel coil ground pile for not applying galvanic anode protection can more or less occur on its surface after power plant expires in the service life
Corrosion, even if especially reaching power plant's service life, surface reluctantly in the slightly strong area spiral ground pile service life of corrosivity
It is corrodible very serious, it is also impossible to recycle again even if extracting, can only abandon.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
A kind of embodiment of invention for those of ordinary skill in the art without creative efforts, can be with
It is extended according to the attached drawing of offer and obtains other implementation attached drawings.
Fig. 1: the flow diagram of application method of the present invention；
Fig. 2: the vertical vertical inbuilt schematic view of the front view of sacrificial anode of the present invention；
Fig. 3: the vertical vertical inbuilt side structure schematic view of sacrificial anode of the present invention；
Fig. 4: the vertical vertical inbuilt schematic perspective view of sacrificial anode of the present invention；
Fig. 5: the inbuilt schematic view of the front view of sacrificial anode Horizontal type of the present invention；
Fig. 6: the inbuilt side structure schematic view of sacrificial anode Horizontal type of the present invention；
Fig. 7: the inbuilt schematic perspective view of sacrificial anode Horizontal type of the present invention；
Fig. 8: the structural schematic diagram of sacrificial anode of the present invention；
Specific embodiment
The invention will be further described with example with reference to the accompanying drawing:
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
It, can also be indirectly connected through an intermediary to be to be connected directly.It for the ordinary skill in the art, can be specific
Situation understands the concrete meaning of above-mentioned term in the present invention.
As shown in Fig. 1 to Fig. 8, a kind of spiral ground pile anti-corrosion protection system is present embodiments provided, which is characterized in that packet
Include: sacrificial anode 1 and spiral ground pile 2, the sacrificial anode 1 include anode bodies 15, and the anode bodies 15 and spiral ground pile 2 are electrical
Connection, the anode bodies 15 are anode, and the spiral ground pile 2 is cathode.
Preferably, the oxidisability of the anode bodies 15 is than spiral ground pile the last 2.
Preferably, the sacrificial anode 1 further includes anode cable 3, seal nipple 11, iron core 12, cloth bag 13 and filler material
14, the anode bodies 15 are set in cloth bag 13, and the filler material 14 fills the inner cavity of cloth bag 13 and is wrapped in anode bodies 15
Wherein, one end of the anode cable 3 is connected by seal nipple 11 with anode bodies 15, and the other end is pierced by cloth bag 13 and spiral
Ground pile 2 connects；The seal nipple 11 is removably connected on anode bodies 15, and the sack of the cloth bag 13 tightens.
It preferably, further include bracket 6, several spiral ground piles 2 and a sacrificial anode 1 form a unit, the spiral
It includes several units that ground pile, which protects system, and all spiral ground piles 2 in a unit are electrically connected by bracket 6.
Preferably, the sacrificial anode 1 in a unit and each spiral ground pile 2 are equidistant.
Preferably, 2 surface of spiral ground pile is provided with corrosion-resistant coating.
A kind of spiral ground pile anti-corrosion protection systematic difference method, which comprises the following steps:
Step 1): selection 15 material of anode bodies；
Step 2): the specification of selection anode bodies 15；
Step 3): the quantity N for the spiral ground pile 2 that single branch anode bodies 15 can protect is calculated；
Step 4): installation of sacrifice anode 1；
Step 5): test 1 cathodic protection anticorrosion ability of sacrificial anode: after 1 Embedded installation of sacrificial anode, to spiral
2 cathodic protection effect of ground pile carries out test evaluation, if spiral ground pile cathodic protection potential, which touches the mark, illustrates spiral ground pile electricity
Chemical attack has obtained good inhibition, completes installation；If spiral ground pile cathodic protection potential does not touch the mark, need
The dosage of additional embedded anode bodies 15 is until reach protecting effect.
Preferably, step 1) is that numerical value selection is surveyed according to soil resistivity at the earth's surface depth 1.5m of construction site: working as soil
Resistivity 10 Ω m and it is following when, using kirsite as anode bodies 15；When soil resistivity is more than 10 Ω m, adopt
Use magnesium alloy as anode bodies 15.
Preferably, step 2) is that 30 years and construction site earth's surface depth are generally according to spiral ground pile design service life Y
Soil resistivity exploration numerical value ρ is designed the weight G and its specification size for calculating and determining anode bodies at 1.5m.Generally by
Several specifications and models sacrificial anodes that professional designer will likely rule of thumb meet design service life substitute into following
A.1, A.2, A.3 in calculation formula, by calculating selected meet and closest to the specifications and models anode bodies of design service life.
A.1, single branch anode bodies ground resistance R is calculated by formula:
The mono- branch anode bodies ground resistance of R-, Ω in formula；
Electric resistance of soil rate score at ρ-construction site earth's surface deep 1.5, Ω m；
L-anode body length, m；
L1-cloth bag, m；
D1-cloth bag diameter, m；
D-anode bodies equivalent diameter, m；
T-anode bodies center ground height, takes 1.5m.
A.2, the electric current If that single branch anode bodies occur is calculated by formula:
I in formulafThe current values that-mono- branch anode bodies occur, A；
Δ E-anode bodies drive current potential, V；Magnesium alloy anode takes Δ E=0.65V
Zinc alloy anode takes Δ E=0.25V.
R-anode bodies ground resistance, Ω；
Anode bodies projected life Y is calculated, and is A.3 calculated by formula:
Y-anode bodies projected life, a in formula；
The mono- branch anode bodies nt wt net weight of G-, Kg；
Q-anode bodies actual capacitance, magnesium alloy anode Q=1100Ah/kg,
Zinc alloy anode Q=780Ah/kg；
1/K-anode bodies usage factor, value 0.85；
ImThe average generation electric current of-every anode bodies, A；Im=(0.6~0.8) If。
Preferably, the spiral ground pile quantity N that the single branch anode bodies of step 3) can be protected is calculated:
The spiral ground pile quantity that the mono- branch anode bodies of N-can be protected in formula, branch, round number；
IfThe magnitude of current, A occur for-anode bodies；
I-protecting current density, by following regulation value；
S-project selectes the surface area of model spiral ground pile, m2；
1) as follows for carbon steel and zinc-plated carbon steel coil ground pile, protecting current density i value:
1. soil resistivity 20 Ω m and it is following when, current density be greater than 20mA/m2；
2. soil resistivity (20~50) Ω m and it is following when, current density takes (10~20) mA/m2；
3. soil resistivity is more than 50 Ω m, current density takes 10mA/m2；
2) when pH value is less than 4.5, the corrosivity of soil enhances, and should increase protecting current density in conjunction with situation；
3) there are the soil environments of sulfate reducing bacteria, should increase current density in conjunction with situation；
4) current density is protected using the spiral ground pile yin for reinforcing grade coating (such as epoxy coating) and takes (2~3) mA/m2；
Preferably, step 4) is specific as follows: sacrificing firstly, being determined according to the quantity N of the calculated spiral ground pile 2 of step 3
Sacrificial anode 1 is arranged in the intermediate appropriate location of this N branch spiral ground pile 2, wherein most by the burial place of anode 1 as far as possible herein
Ideal arrangement protects spiral ground pile 2 is equidistant to be evenly arranged by sacrificial anode 1 with it；Secondly, fixed sacrificial
1 burial place of domestic animal anode slots or drills through its Embedded installation operation dell, makes 81.5 meters far from ground of 1 center of sacrificial anode；
Filler material 14 is impregnated with to its watering after sacrificial anode 1 is placed, and is backfilled after reaching saturation, while anode cable 3 being drawn
Ground 8；Again, crimp copper lug 4 in 3 end of anode cable, by copper lug 4 by bolt 5 and periphery one of them spirally
Stake 2 is securely attached to together, and the bracket 6 of same row's photovoltaic panel 7 all mutually overlaps in photovoltaic plant, they are
All mutually conducted between one entirety, and 2 top of spiral ground pile is connect with bracket 6, between be also mutually electrically to connect
It connects, therefore anode cable 3 need to be only electrically connected with one, its periphery spiral ground pile 2, just be realized between other spiral ground piles 2 of periphery
Mutually conduct, to protect periphery others spiral ground pile 2；Finally, crimping 4 position of copper lug using anti-in bolt 5
Rotten coating carries out anti-corrosion, and anode cable 3 is buried, and restores ground 8.
There are two types of 1 Embedded installation modes of sacrificial anode: vertical vertical embedded and Horizontal type is embedded；Above two sacrifice sun
It is the same that pole embedding manner anode, which plays effect, but vertical embedding manner excavation amount is smaller, and can use spiral
Ground pile piling machinery drilling deep hole (hole depth about 2m or so), by sacrificial anode 1 directly it is vertical be put into, using mechanical work anode install
High-efficient, it is more more convenient to construct.
Preferably, step 5) is specific as follows: sacrificial anode Embedded installation finishes, and carries out to spiral ground pile cathodic protection effect
Test evaluation should meet one of following index: under normal circumstances, spiral ground pile cathodic protection potential, that is, metal component/ground interface
Current potential should be -850mVCSE or more negative；In special circumstances, when -850mV criterion is difficult to reach, can using cathodic polarization or
Depolarize the criterion that potential difference is greater than 100mV.Spiral ground pile cathodic protection potential reaches the above index and illustrates spiral ground pile electrification
It learns corrosion and has obtained good inhibition, anticorrosion ability is ideal.If not up to These parameters, additional embedded anode bodies are needed
Dosage is until reach protecting effect.
Preferably, during sacrificial anode is moved and buried, lifting anode cable is not allowed, to avoid seal nipple fracture；
Sacrificial anode filler material pours water saturates before embedded；Sacrificial anode cable should at least stop 10% flexible surplus, to prevent under soil
Cable is broken when heavy, general anode cable is to 2.5 meters of the youthful and the elderly.
Experiment:
The photovoltaic plant on-site that test site addressing is saved at certain, test site are typical landlocked saline soil matter, are belonged to
Deep-etching soil environment.
Test material
It is Ф 76mm × 1600mm Steel coil ground pile as subjects that this test, which has chosen 9 specifications, wherein 6
It is galvanizing coating for spiral ground pile, zinc-plated thickness is 80 μm, and in addition 3 spiral ground piles are epoxy powder coating.Sacrificial anode material
Material has chosen the sacrificial magnesium alloy anode that the national standard trade mark is MGAZ63BCT according to on-site soil resistivity value and test period,
Weight is 4kg, and specification is 350mm × (75mm+95mm) × 75mm, this test uses 4 model sacrificial magnesium alloy sun
Pole.
Test method
(1) sample installation exercise process
9 spiral ground piles are arranged into unwrapping wire according to 3 × 3 square matrix in optional test place, adjacent ground pile interval is
Spiral ground pile is screwed into underground using small-sized electric machinery by 2m, and it is exposed in earth's surface that there are 20cm surpluses for upper end.
1#, 2# and 3# spiral ground pile surface are epoxy powder coating, and 4#~9# spiral ground pile surface is galvanizing coating.Test
4 sacrificial magnesium alloy anodes are connected respectively on 5#, 6#, 7# and 8# spiral ground pile in the process, it is anti-to apply cathodic protection to it
Corrosion measure, the sacrificial anode depth of burying are 1.5 meters, and anode cable is crimped onto spiral ground pile upper end by bolt, thus real
Existing sacrificial anode with need to protect being electrically connected between ground pile.Since testing operation season is winter, test site soil compares
It is dry, to promote sacrificial anode to play a role as early as possible, a large amount of waterings are carried out to anode before anode is embedded and have been impregnated.
After the completion of sacrificial anode installation exercise, protection potential test is carried out to 9, scene spiral ground pile, is not affixed by cathode
5 ground pile protection potentials of protection are normal natural potential (corrosion potential) to apply between -0.55V~-0.65V
For 4 spiral ground pile protection potentials of galvanic anode protection between -1.0V~-1.1V, protecting effect is ideal.
Drawing has been done to spiral ground pile in test site simultaneously and torsion-testing is tested, test data meets this area's photovoltaic
Power station is to the requirement of ground force design.
(2) test period
The entire spiral ground pile galvanic anode protection effect test period is 5 years.
Test result and assay
Cathodic protection effect has been carried out to spiral ground pile galvanic anode protection test site after 5 years and has excavated verifying, sight
The contents of the test such as examine, evaluate.
Cathodic protection potential measurement and evaluation
It can be seen that apply 5#~8# spiral ground pile current potential negative offset of cathodic protection clearly, in -1.06V or so,
Reach related specifications standard requirements -0.85V (CSE) or more negative requirement, illustrate that cathodic protection effect is ideal.And
It is corrosion potential (natural potential) that other 5, which do not apply cathodic protection spiral ground pile current potential, wherein 1#~3# epoxy coating
Spiral ground pile natural potential is slightly defeated by 4#, 9# zinc-coated spiral ground pile natural potential.
Anticorrosion ability excavates verifying analysis
(1) spiral pile body macrocorrosion pattern comparative analysis
Verifying work is excavated in this test, has been randomly selected 4 in test site spiral ground piles and has been observed to score
Analysis: do not apply the 4# zinc-coated spiral ground pile of cathodic protection and 2# epoxy coating spiral ground pile and apply galvanic anode protection
5# and 7# zinc-coated spiral ground pile.
There is large area unsymmetrical corrosion in the zinc-coated spiral ground pile under ground portion pile body surface of no cathode protection measure, close
Numb corrosion pockmark, a large amount of red corrosion products (iron rust) cover underground pile body surface comprehensively, have rusty stains, thus judge
80 μ m thick zinc layers are entirely ineffective, and substantially depleted.Plain steel has started corrosion phenomenon occur, and surface occurs big
The floating rust of area.Thus it can determine whether service life of 80 μm of the zinc coat in salt-affected soil less than 5 years.
It does not send out on the plating epoxy coating spiral ground pile under ground portion surface without cathode protection measure after salinized soil corrodes 5 years
Now apparent corrosion phenomenon, but there is apparent corrosion iron rust in the damaged place of pile body screw thread piece edge epoxy coating.In spiral shell
Rotation ground pile is screwed into ground operation process, and screw thread piece bears most of torsional forces, and epoxy coating brittleness is big in addition, so in spiral shell
The epoxy coating on line piece periphery (especially edge) is easy to non-plastic fracture in the state of stress and collapses out, to make plain steel
Exposed that serious local corrosion occurs in soil corrosion medium, local corrosion speed ratio occurs without corrosion-inhibiting coating metal component
Comprehensive uniform corrosion rate is fast, and with the development of local corrosion at epoxy coating breaking point, the epoxy on breaking point periphery is applied
Layer can gradually removing fall off (water is penetrated into from breaking point on the plain steel below its periphery epoxy coating, plain steel hair
Raw corrosion, the iron rust bulbs of pressure cause epoxy coating cracking to fall off), as the extension screw thread piece local corrosion area of time is more next
Bigger, screw thread piece corrosion failure, influences entire pile foundation stress over time.
Epoxy coating be in the spiral ground pile entirety anti-corrosion effect short time it is relatively good, long-time service need to combine cathodic protection
Measure joint anti-corrosion is only preferred plan.Since epoxy coating processing technology will increase dramatically the cost of spiral ground pile, phase
It is more economically reasonable not as good as zinc-plated+cathodic protection Corrosion prevention scheme for.
There are a large amount of white precipitate substances (when cathode is protected on the zinc-coated spiral ground pile surface of application galvanic anode protection
The product occurred when protecting abundant in protection metal body surface), which is referred to as " cathodic protection product ", main component Ca
(OH) compounding substances such as 2 and a small amount of Mg (OH) 2.Be somebody's turn to do " yin protects product " adherency periphery sandy soil uneven thickness is tightly wrapped in stake
Body, it is very fine and close and strong with pile body cohesive force, it needs artificial strength chisel that could remove, has certain degree of hardness, as given spiral
Ground pile has put on airtight " jacket ", well protects pile body.It is showed after cathodic protection product is removed good
Good, smooth, complete pile body Several Thiourea Derivatives on Zinc Plate Surface, has not a particle of iron rust trace, and protecting effect is very good.
(2) analysis of micro-morphology
Microcosmic erosion profile is observed under 200 times of optical microscopy not plus the 7# spiral ground pile of negative guarantor's measure is sacrificed with application
The 5# spiral ground pile pile body surface pattern of anode yin guarantor's measure.
5 years are buried not in test site plus the 7# zinc-coated spiral ground pile pile body galvanizing coating of negative guarantor's measure fails substantially, are disappeared
Totally, surface layer has been covered with corrosion iron rust to consumption, and can be seen that iron rust layer consistency is poor, and integrality is poor, the erosion to medium
Blocking capability is small.
Apply the 5# spiral pile body of galvanic anode protection anticorrosive measure, face zinc coat is very complete to close, protection
Effect is very good.
Corrosion rate calculates
Analysis situation is verified by digging in-situ to see, does not apply the zinc coat anti-corrosion of 80 μm of cathodic protection zinc-coated spiral ground pile
Service life, zinc coat corrosion rate was in 16 μm/a~20 μm/a, and spiral ground pile plain steel surface has had rusty stains less than 5 years,
Start accelerated corrosion.
The spiral ground pile protecting effect for applying galvanic anode protection anticorrosive measure is ideal, Zinc coat light
Sliding complete, corrosion rate is very little, ignores.
Conclusion (of pressure testing)
(1) the spiral ground pile anti-corrosion protection effect for applying galvanic anode protection anti-corrosion measure is ideal, especially
Zinc coat is as excellent as before.It being tightly wrapped in it is found furthermore that pile body surface protects product by a large amount of yin, yin protects product uneven thickness,
But very fine and close, cohesive force is strong and certain degree of hardness, also protects pile body well.
(2) galvanizing coating for not applying 80 μ m-thick of zinc-coated spiral ground pile of cathodic protection fails substantially, depleted, carbon steel
Matrix skin has rusty stains.Zinc coat corrosion rate is 16 μm/a~20 μm/a, is illustrated traditional in deep-etching soil environment
Galvanizing coating spiral ground pile is unable to satisfy its Long Service Life requirement.
(3) the damaged place of screw thread piece edge epoxy coating of the plating epoxy coating spiral ground pile of cathode protection measure is not applied
Significant etching problem occurs.
(4) zinc-plated+galvanic anode protection combined measures can be very good to solve spiral in complicated soil environment
The etching problem of ground pile, reaches projected life.
The present invention is described by way of example above, but the present invention is not limited to above-mentioned specific embodiment, all to be based on
Any changes or modifications that the present invention is done are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of spiral ground pile anti-corrosion protection system characterized by comprising sacrificial anode (1) and spiral ground pile (2), institute
Stating sacrificial anode (1) includes anode bodies (15), and the anode bodies (15) and spiral ground pile (2) are electrically connected, the anode bodies
It (15) is anode, the spiral ground pile (2) is cathode.
2. a kind of spiral ground pile anti-corrosion protection system according to claim 1, it is characterised in that: the anode bodies (15)
Oxidisability it is stronger than spiral ground pile (2).
3. a kind of spiral ground pile anti-corrosion protection system according to claim 1 or 2, it is characterised in that: the sacrifice sun
Pole (1) further includes anode cable (3), seal nipple (11), iron core (12), cloth bag (13) and filler material (14), the anode bodies
(15) it is set in cloth bag (13), anode bodies (15) are simultaneously wrapped in it by the inner cavity of filler material (14) filling cloth bag (13)
In, one end of the anode cable (3) is connected by seal nipple (11) with anode bodies (15), and the other end is pierced by cloth bag (13)
It is connect with spiral ground pile (2)；The seal nipple (11) is removably connected on anode bodies (15), the sack of the cloth bag (13)
It tightens.
4. a kind of spiral ground pile anti-corrosion protection system according to claim 1, it is characterised in that: it further include bracket (6),
Several spiral ground piles (2) form a unit with a sacrificial anode (1), and it includes several lists which, which protects system,
Member, all spiral ground piles (2) in a unit pass through bracket (6) and are electrically connected.
5. a kind of spiral ground pile anti-corrosion protection system according to claim 1, it is characterised in that: sacrificial in a unit
Domestic animal anode (1) is equidistant with each spiral ground pile (2).
6. a kind of spiral ground pile anti-corrosion protection system according to claim 1, it is characterised in that: the spiral ground pile
(2) surface is provided with corrosion-resistant coating.
7. a kind of a kind of spiral ground pile anti-corrosion protection systematic difference side using as described in claim 1 to 6 any one
Method, which comprises the following steps:
Step 1): selection anode bodies (15) material；
Step 2): the specification of selection anode bodies (15)；
Step 3): the quantity N for the spiral ground pile (2) that single branch anode bodies (15) can protect is calculated；
Step 4): installation of sacrifice anode (1)；
Step 5): test sacrificial anode (1) cathodic protection anticorrosion ability: after sacrificial anode (1) Embedded installation, to spiral
Ground pile (2) cathodic protection effect carries out test evaluation, if spiral ground pile cathodic protection potential, which touches the mark, illustrates spiral ground pile
Electrochemical corrosion has obtained good inhibition, completes installation；If spiral ground pile cathodic protection potential does not touch the mark, need
The dosage of embedded anode bodies (15) is added until reaching protecting effect.
8. a kind of spiral ground pile anti-corrosion protection systematic difference method as claimed in claim 7, it is characterised in that: step 1)
To survey numerical value selection according to soil resistivity at the earth's surface depth 1.5m of construction site: when soil resistivity is in 10 Ω m and following
When, using kirsite as anode bodies (15)；When soil resistivity is more than 10 Ω m, using magnesium alloy as anode bodies
(15)。
9. a kind of spiral ground pile anti-corrosion protection systematic difference method as claimed in claim 7, it is characterised in that: step 2)
It is counted to survey numerical value with soil resistivity at construction site earth's surface deeply 1.5 meters according to spiral ground pile (2) design service life
Calculate the weight and its specification size for determining anode bodies (15).
10. a kind of spiral ground pile anti-corrosion protection systematic difference method as claimed in claim 7, it is characterised in that: step 4)
It is specific as follows: firstly, the burial place of sacrificial anode (1) is determined according to the quantity N of the calculated spiral ground pile of step 3) (2),
Sacrificial anode (1) is arranged in the intermediate appropriate location of this N branch spiral ground pile (2) as far as possible herein, wherein optimal arrangement side
Formula protects spiral ground pile (2) is equidistant to be evenly arranged by sacrificial anode (1) with it；Secondly, in fixed sacrificial anode (1)
Burial place slots or drills through its Embedded installation operation dell, makes (8) 1.5 meters far from ground of sacrificial anode (1) center；It will be sacrificial
Filler material (14) is impregnated with after placing to its watering by domestic animal anode (1), and is backfilled after reaching saturation, while anode cable (3) being drawn
Ground (8) out；Again, copper lug (4) are crimped in anode cable (3) end, by copper lug (4) by bolt (5) and periphery its
In a spiral ground pile (2) be securely attached to together, bracket is all electrically connected with each other between (6), and spiral ground pile (2)
Top is connect with bracket (6), between be also to be electrically connected with each other, therefore anode cable (3) only need to be with one, its periphery spirally
Stake (2) be electrically connected, just realize mutually conducting between other spiral ground piles (2) of periphery, thus protect periphery other
Spiral ground pile (2)；Finally, anti-corrosion is carried out using anticorrosive paint in bolt (5) crimping copper lug (4) position, by anode cable
(3) it buries, restores ground (8).
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| CN201811245780.0A CN109097782A (en) | 2018-10-24 | 2018-10-24 | A kind of spiral ground pile anti-corrosion protection system and its application method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965065A (en) * | 2019-12-30 | 2020-04-07 | 苏州电力设计研究院有限公司 | Transformer substation grounding system |
| CN111270245A (en) * | 2020-03-23 | 2020-06-12 | 太原理工大学 | Cathodic protection and corrosion prevention system and method for PHC tubular pile bottom end plate |
| CN111366620A (en) * | 2020-03-24 | 2020-07-03 | 青岛双瑞海洋环境工程股份有限公司 | Method and detection equipment for evaluating electrochemical performance of aluminum anode for immersed tube steel shell over-long service |
| CN112779911A (en) * | 2020-12-29 | 2021-05-11 | 威海立达尔机械股份有限公司 | Ground screw using sacrificial anode |
| CN113300259A (en) * | 2021-05-10 | 2021-08-24 | 山东电力工业锅炉压力容器检验中心有限公司 | Power station grounding grid water immersion and resistance reduction protection device and method |
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2018
- 2018-10-24 CN CN201811245780.0A patent/CN109097782A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965065A (en) * | 2019-12-30 | 2020-04-07 | 苏州电力设计研究院有限公司 | Transformer substation grounding system |
| CN111270245A (en) * | 2020-03-23 | 2020-06-12 | 太原理工大学 | Cathodic protection and corrosion prevention system and method for PHC tubular pile bottom end plate |
| CN111366620A (en) * | 2020-03-24 | 2020-07-03 | 青岛双瑞海洋环境工程股份有限公司 | Method and detection equipment for evaluating electrochemical performance of aluminum anode for immersed tube steel shell over-long service |
| CN112779911A (en) * | 2020-12-29 | 2021-05-11 | 威海立达尔机械股份有限公司 | Ground screw using sacrificial anode |
| CN113300259A (en) * | 2021-05-10 | 2021-08-24 | 山东电力工业锅炉压力容器检验中心有限公司 | Power station grounding grid water immersion and resistance reduction protection device and method |
| CN113300259B (en) * | 2021-05-10 | 2023-07-14 | 山东电力工业锅炉压力容器检验中心有限公司 | Water immersion negative protection resistance reduction device and method for power station grounding grid |
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