CN211646448U - Anti-corrosion anchor bolt piece, pre-stressed anchor bolt assembly and wind power supporting structure - Google Patents

Abstract

The utility model provides an anti-corrosion anchor bolt part, which comprises an anchor bolt part body and an anti-corrosion coating layer arranged outside the polished rod part of the anchor bolt part body; the corrosion-resistant coating has a bridging portion extending axially along the anchor bolt member body. The utility model discloses a vertical (along the axial) anticorrosive area of cladding in the polished rod outside of crab-bolt body, can reduce the introduction of cladding in-process air, reduce the length of overlap joint portion simultaneously, reduce the probability that anticorrosion anchor bolt spare was corroded.

Description

Anti-corrosion anchor bolt piece, pre-stressed anchor bolt assembly and wind power supporting structure

Technical Field

The utility model belongs to wind-powered electricity generation bearing structure field, concretely relates to anticorrosion anchor bolt spare, prestressing anchor bolt subassembly and wind-powered electricity generation bearing structure subassembly.

Background

The wind power generation system mainly comprises four parts, namely a fan blade, a cabin, a tower and a foundation. The blades and nacelle at the top of the tower are generally referred to as a superstructure, and the tower and foundation that are used for carrying loads are generally referred to as a support structure.

The prestressed anchor bolt foundation is a foundation type commonly used for a wind power generation structure, and under the foundation structure, the upper load of a wind turbine generator is transmitted to a concrete foundation through a prestressed anchor bolt assembly. The anchor bolt assembly consists of an upper anchor plate, a lower anchor plate, an anchor bolt and an anchor bolt matching part, wherein the anchor bolt is used as a prestress tension member of the foundation concrete and plays a role of fastening and connecting an upper structure, and is a key part. The anchor bolt has screw threads at two ends and a smooth rod section in the middle. The body material that the crab-bolt adopted adopts metal material, once the crab-bolt structure buries the concrete, need guarantee not to corrode in long-time life cycle (20 years ~ 25 years), for this reason, the anticorrosive design of crab-bolt just becomes crucial.

In general design, after the anchor bolt is buried in the basis, in whole use, can not dismantle change and maintenance, if the bolt corrodes seriously, will bring the hidden danger for superstructure safe operation, especially in great and marine environment of humidity, the corruption of bolt is more serious, can threaten the safe operation of equipment sometimes, can take place serious incident such as collapse in the extreme case.

The crab-bolt is buried underground in the concrete foundation always, and although the outside of crab-bolt spare is equipped with the isolation sleeve, the moist environment still can increase the corruption probability of crab-bolt spare, and because crab-bolt spare is in the underground always, and the ventilation is poor, in case take place into water the problem, moisture is stored up in the sleeve pipe, is difficult to volatilize, takes place the risk of soaking water, causes water oxygen erosion, the corrosion problem appears.

On the other hand, the anchor bolt is a prestressed tension member, and needs to be applied with larger prestress in the installation process, and the anchor bolt is fixedly connected with the upper tower structure and the foundation through the prestress. During the tensioning of the anchor bolt, the anchor bolt can develop a large tensile deformation, and the process causes a challenge to the corrosion prevention of the anchor bolt coating.

In the prior art, the most common anticorrosion method is to perform Dacromet or hot-dip galvanizing anticorrosion coating treatment on the surface of the anchor bolt, and a thermal shrinkage sleeve anticorrosion mode is also adopted. The hot-dip galvanizing corrosion resistance has certain corrosion resistance, but the anchor bolt has certain hydrogen embrittlement risk after the hot-dip galvanizing, and has no acid resistance. The dacromet treatment also has no acid resistance, and the dacromet contains chromic anhydride, which causes environmental pollution; the Dacromet has the advantages of higher sintering temperature, longer time and high energy consumption. In addition, the brittle hard coating treated by the Dacromet technology can generate large deformation after the anchor bolt is tensioned. Meanwhile, the elongation of the anchor bolt is constantly changed due to the influence of wind load, and the hot-dip zinc and dacromet paint film is easy to crack under the action of alternating stress. In addition, the dacromet or hot dip zinc anticorrosive coating treatment is weak against water immersion corrosion.

The common anticorrosion measure in the prior art is also realized by sleeving the protective sleeve on the outer side of the anchor bolt body. The sheath is used for protecting the anchor bolt body and protecting the anti-corrosion coating so as to prevent the anti-corrosion coating from being damaged. The anti-corrosion sheath adopts a polyethylene heat shrinkable sleeve, and the heat shrinkable sleeve shrinks under the heating condition to tightly wrap the protected anchor bolt, so that the anchor bolt is sealed. When the heat shrinkable sleeve is used, the heat shrinkable sleeve is bulged due to construction reasons such as uneven baking and the like in the actual application process. Meanwhile, the adhesion between the heat-shrinkable sleeve and the anchor bolt is not firm, and air bubbles are easily formed between the heat-shrinkable sleeve and the anchor bolt, so that the corrosion resistance is influenced, and the service life of the anchor bolt is greatly influenced; especially under high temperature, the anchor bolt can be debonded due to poor adhesion, and the defect can be continuously expanded along with the passage of time, so that the corrosion resistance of the heat-shrinkable sleeve is failed.

Therefore, there is a need in the art to develop an anti-corrosion anchor bolt assembly that can withstand a large tensile force and resist a severe corrosive environment, and that can ensure the lifespan of the anchor bolt assembly.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to provide an anti-corrosion anchor bolt piece for wind power foundation, which comprises an anchor bolt piece body and an anti-corrosion coating layer arranged outside the polished rod part of the anchor bolt piece body; the corrosion-resistant coating has a bridging portion extending axially along the anchor bolt member body.

"anticorrosive coating has the edge the overlap joint portion of anchor bolt spare body axial extension" means anticorrosive coating uses the annular cladding in the anchor bolt spare body outside, and has an overlap joint portion, overlap joint portion is rectangular shape, the initiating terminal of rectangular shape is the smooth rod portion tip of anchor bolt spare body, and the termination end is the smooth rod portion afterbody of anchor bolt spare body.

The utility model provides an anticorrosion anchor bolt spare, it is through the anticorrosive area of vertical (along the axial) cladding in the polished rod outside of crab-bolt body, realizes the separation to water oxygen. The polished rod of crab-bolt spare body and anticorrosive area carry out the cladding in-process, select vertical cladding, and anticorrosive area instantaneous bonding contact crab-bolt's width can increase during the cladding shortens the flow of cladding, reduces overlap area, can effectively reduce the production of defects such as bubble, fold, leak source, has excellent performance in the salt spray test.

The utility model provides an anticorrosion anchor bolt spare satisfies that the neutral salt fog test defect area percentage is less than or equal to 0.1% (for example 0.08%, 0.06%, 0.04% etc.) in 1000 hours under 0.7 times yield strength standard value tension state.

The utility model provides an anticorrosion anchor bolt spare is through vertical parcel anticorrosive area can realize the even no leak source cladding to the crab-bolt spare, can bear certain tension force simultaneously, and satisfy the anticorrosive requirement of crab-bolt spare under the stretch-draw condition, can satisfy promptly under 0.7 times yield strength standard value stretch-draw state, satisfy 1000 hours neutral salt fog test defect area percentage and be less than or equal to 0.1%.

Preferably, the thickness of the anticorrosion coating layer is 0.5-2.5 mm (for example, 0.6mm, 0.8mm, 1.0mm, 1.5mm, 1.7mm, 1.9mm, 2.3mm and the like).

In addition, the anticorrosive coating layer with the thickness of 0.5-2.5 mm can be matched with the installation environment of the anticorrosive anchor bolt piece, and when the thickness is higher than 2.5mm, the anticorrosive coating layer is scratched and rubbed when the anchor bolt piece penetrates through the isolation sleeve or the anchor bolt hole in the installation process, damage is caused and the like due to the fact that the anticorrosive coating layer is too thick; when the thickness is less than 0.5mm, the waterproof defect can be caused in the use environment because the anticorrosive coating layer is too thin; the problems of folds, damage and the like can cause the erosion of water and oxygen, reduce the effective period of corrosion prevention and influence the service life of the anchor bolt and the foundation.

Preferably, the width of the overlapping part is 2mm to 30mm, such as 3mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm, etc., and preferably the width of the overlapping part is 5mm to 25 mm.

The lapping part plays a role in sealing and fixing the anti-corrosion belt in a cladding way at the rod part of the anchor bolt body, and the lapping part with proper width is favorable for avoiding the problems of folds, leakage points and the like in the use process of the anti-corrosion anchor bolt component. The width of the lap joint part is too small (< 2mm), the adhesive force of the lap joint part is insufficient, the conditions of lap joint edge separation and crack leakage are easy to occur, and the problems of rusting, corrosion points and the like are caused. The upper limit of overlap joint portion exceeds 30mm, because the overlap joint can cause the stack in thickness, though can adopt the mode of attenuate individual layer thickness to go on, the thickness predictability after the stack is poor, can't predict final thickness, causes certain obstacle for the quality control of product. The width of the lap joint part of less than 30mm can reduce the thickness of the lap joint part by repeatedly pressing the anchor bolt part in the radial direction, thereby reducing the influence on the thickness of the anti-corrosion coating layer.

The exemplary embodiment of the method for producing an anti-corrosion anchor member provided by the present invention is: anticorrosive coating is followed by the anticorrosive area that has the autohension the axial direction of the polished rod of crab-bolt spare body extends the tiling, pastes the face upwards, the polished rod of crab-bolt spare body is by the rotatory roll extrusion of one side to the other side of anticorrosive area, so that anticorrosive area is rotatory to be pasted on the crab-bolt, until anticorrosive area is followed the cladding is accomplished to the circumferencial direction of the polished rod of crab-bolt spare body, forms overlap joint portion.

The utility model discloses a vertical cladding anticorrosion area in the polished rod outside of crab-bolt body, from anticorrosive area one side roll extrusion to opposite side, can reduce the introduction of cladding in-process air to reduce the probability that the bubble produced, exert the constant voltage to the anticorrosion area simultaneously in bonding process, guarantee that anticorrosive area is pressed and is closed the bonding effect, avoid the anticorrosion area to be drawn the thickness inequality that deformation produced, reduce the length of overlap joint portion simultaneously, reduce the weak point of anticorrosive area, thereby reduce the probability that anticorrosion anchor bolt spare was corroded.

The one side of the corrosion prevention tape means the long side of the corrosion prevention tape. In this embodiment, after the anti-corrosion tape is laid flat, the anti-corrosion tape comprises 2 opposite long sides and 2 opposite short sides; the polished rod of crab-bolt spare body is parallel (or be close to parallel) in long limit pastes anticorrosive area paste the face back of pasting, by the long limit roll extrusion of one side to the long limit of opposite side, make anticorrosive area paste on the polished rod of crab-bolt spare body, last two relative long limit overlap joints each other, form the overlap joint portion that overlaps.

Preferably, the corrosion protection tape has at least one of the following exemplary properties:

(ii) the peel strength is not less than 0.6N/mm, for example, 0.8N/mm, 1.0N/mm, 1.5N/mm, 2.0N/mm, 2.5N/mm, 2.8N/mm, etc.

② the elongation at break is more than or equal to 400 percent, such as 450 percent, 500 percent, 550 percent, 600 percent, 650 percent and the like.

③ tensile strength at break is not less than 6MPa, such as 7MPa, 8MPa, 9MPa, 10MPa, 11MPa, 12MPa, 13MPa, 14MPa, etc.

And fourthly, the water impermeability meets the requirement of water pressure of 0.3MPa and water seepage does not occur within 30 min.

Hold viscosity not less than 15 min.

Preferably, the anti-corrosion tape comprises a macromolecule butyl self-adhesive waterproof tape.

Illustratively, the macromolecule butyl self-adhesive waterproof tape comprises a base film layer and a butyl blended adhesive layer coated on the base film layer; the coating is realized by hot co-extrusion; the anti-corrosion belt comprises a base film layer and a butyl blended adhesive layer which is extruded on the base film layer in a thermal compounding manner.

The waterproof area of polymer butyl self-adhesion has high creep property, all has viscidity and self-healing ability in the whole life of anticorrosive coating, and when the waterproof layer received exogenic action and was stabbed, the damage point can not enlarge, and the waterproof layer bottom can not take place to scurry the water phenomenon yet, moreover because creep action can be gradually with the damage point restoration, improved the reliability of anticorrosive coating greatly. Therefore, the macromolecule butyl self-adhesive waterproof tape not only can meet the requirements of peeling strength, tensile strength, impermeability and permanent viscosity, but also can provide a self-healing function and meet the anti-corrosion requirement of the anchor bolt part of the wind power foundation.

Illustratively, the thickness of the base film is not more than 30% of the thickness of the anti-corrosion tape, and in specific implementations, when the thickness of the anti-corrosion tape is 1.2mm, the thickness of the base film can be 0.35mm, 0.3mm, 0.2mm, 0.1mm, 0.05mm, and the like.

Illustratively, the base film layer includes any one of a PE layer, a PET layer, a non-woven fabric, and an aluminum foil, and preferably a PE layer.

In this example, an anti-corrosive tape having a base film layer and a butyl rubber layer is selected, the base film layer can protect the integrity of the butyl rubber layer, and the butyl rubber has good chemical stability and thermal stability, outstanding air and water tightness, ozone resistance and aging resistance. Meanwhile, the butyl rubber has good ductility and self-adhesiveness, and can endow the anti-corrosion tape with good lap joint integrity; the combination of the two can meet the requirements for the anti-corrosion coating layer. In addition, butyl rubber has never-cured properties, and therefore it has excellent followability to surface thermal expansion and cooling and mechanical deformation of an adhered object, and is a preferred waterproof sealing material.

However, the wrapping mode of the butyl rubber-based anticorrosive tape is more important because of the self-adhesion and the following performance to the target object, and once an accident occurs in the wrapping mode, the butyl rubber-based anticorrosive tape is easy to be sticky and causes wrapping defects, especially in the conventional spiral wrapping mode, because the butyl rubber-based anticorrosive tape is stretched at a certain angle and with certain strength with the target object, the pulling force and the angle of the wrapping are not easy to control, and the problems of hollowing, leaking points, edge warping, uneven overlapping thickness and the like are easily caused, so that the anticorrosive performance of the anchor bolt piece is affected.

Illustratively, the anchor bolt has a straightness of 2.5mm/m or less, such as 2.3mm/m, 2.0mm/m, 1.8mm/m, 1.6mm/m, 1.4mm/m, 1.2mm/m, 1.0mm/m, 0.8mm/m, etc., and a curvature of 0.1% or less, such as 0.08%, 0.06%, 0.04%, etc., over the total length.

The utility model provides an anticorrosion anchor bolt spare adopts 5kV electric spark leak detector to leak hunting, the number of a check leak point of anticorrosive coating is less than or equal to 1 point/70 m, for example 0 point/75 m, 1 point/80 m, 1 point/90 m, 1 point/100 m etc..

It should be noted that the length of the anchor bolt member is generally 3.5m to 4.5m, and the number of the one-time detection leak points of the anti-corrosion coating layer is less than or equal to 1 point/70 m, which means that the number of the one-time detection leak points of 20 anti-corrosion anchor bolt members with a length of 3.5m is less than or equal to 1, which is obtained by summing the lengths of the anchor bolt members. The number of the leakage points detected at one time means the leakage point detection after the coating is finished under the condition that no repair is carried out; in the actual production process, the leak source can be repaired after unqualified detection.

The electric spark detection can detect the weak point of the anti-corrosion coating layer, and if the weak point appears, the thickness of the anti-corrosion coating layer is not uniform or the bonding of the lap joint part is not compact. To the anti-corrosion anchor bolt spare on wind-powered electricity generation basis, choose for use the utility model provides a method of vertical cladding is anticorrosive can improve the cladding homogeneity, reduces the leak source. And the service life of the anti-corrosion anchor bolt can be better prolonged when the leak point is less than or equal to 1 point/70 m.

In addition, in preferred scheme, select for use the longitudinal cladding mode cladding anchor bolt spare that this application provided, the cladding does not have distortion fold, and overlap joint portion does not have the limit that sticks up, does not have empty drum.

When the anti-corrosion tape with the lasting viscosity of more than or equal to 15min, the peeling strength of more than or equal to 0.6N/mm, the elongation at break of more than or equal to 400 percent, the tensile strength at break of more than or equal to 6MPa and water impermeability is selected, the anti-corrosion layer is endowed with better self-repairability, self-adhesiveness and water-oxygen isolation performance, and the defect area of a 1000-hour neutral salt spray test can be 0 under the condition of being tensioned according to the standard value of 0.7-time yield strength.

Preferably, the anchor bolt member body comprises a grease dry film protective layer arranged on the surface layer of the anchor bolt member.

Preferably, the grease dry film protective layer is obtained by drying vegetable-based grease.

Preferably, the thickness of the grease dry film protective layer is 1-4 μm (for example, 1.5 μm, 2.5 μm, 3.0 μm, 3.5 μm, etc.).

It should be noted that, one implementation manner of the grease dry film protective layer is that the anchor bolt part body is sprayed with plant-based lubricating oil in the machining process, the plant-based lubricating oil only needs to remove excessive redundancy and does not need to be completely removed, and then the plant-based lubricating oil is directly baked, and the retained lubricating oil is dried to form the grease dry film protective layer.

Preferably, the anchor bolt member body includes a grease-hydrophobic layer disposed outside the threaded portion.

Preferably, the hydrophobic layer is an anti-rust lubricating grease layer.

In the actual production process, the hydrophobic layer is generally grease with high viscosity, so a plastic protective sleeve is sleeved outside the threaded part.

Because the anti-corrosion anchor bolt piece can be buried in the concrete foundation for a long time in the using process, the environment is humid, and even the risk of water soaking is easy to occur; the grease dry film protective layer can improve the hydrophobicity of the anchor bolt piece, can improve the adaptability of the anti-corrosion anchor bolt piece in a use environment, and prolongs the service life of the anti-corrosion anchor bolt piece.

The utility model also provides a preparation method of anti-corrosion anchor bolt spare according to one of purpose, preparation method includes the following step:

(1) providing an anchor bolt component body; the anchor bolt part body comprises a polished rod part and threaded parts arranged at two ends of the polished rod part;

(2) providing an anti-corrosion belt, extending and flatly paving the anti-corrosion belt along the axial direction of the polish rod of the anchor bolt body, and lapping and wrapping the polish rod of the anchor bolt body by long edges at two sides to obtain an anti-corrosion anchor bolt;

(3) and carrying out corrosion prevention treatment on the threaded part of the anchor bolt piece body.

It should be noted that the length of the anti-corrosion belt provided by the present invention should be the same as the length of the light rod of the anchor bolt member body.

Preferably, the outside of the anchor bolt part body is coated with vegetable-based grease, and the preparation method comprises the following steps (2a) and (2b) between the step (1) and the step (2):

(2a) removing redundant grease coated on the outer side of the polished rod part;

(2b) and baking the anchor bolt piece body to obtain a grease dry film protective layer on the surface layer of the anchor bolt piece.

As mentioned above, the body of the anchor bolt member is coated with grease, which may be vegetable-based grease or the like during machining.

Preferably, the baking temperature is 240-280 ℃ (e.g., 245 ℃, 250 ℃, 255 ℃, 260 ℃, 265 ℃, 270 ℃, 275 ℃ and the like), and the baking time is 20-30 min (e.g., 22min, 26min, 28min and the like).

Preferably, the baking comprises raising the temperature from room temperature to 240-280 ℃ at a rate of 15-20 ℃/min, then preserving the temperature for 20-35 min, and then naturally cooling to room temperature.

Preferably, the anticorrosion treatment of step (3) comprises applying a hydrophobic layer, preferably a hydrophobic layer of antirust lubricating oil.

The utility model aims three are to provide a prestressed anchorage bolt subassembly, the crab-bolt subassembly include last stock piece, down stock piece, a plurality of be used for fixed stock piece and down stock piece one of as the purpose anticorrosion stock piece.

The utility model provides an among the prestressed anchorage spare, can be directly with one of purpose anticorrosion anchorage spare buries underground, omits the isolation pipes such as the PVC pipe that prior art cover was established. This is mainly because the utility model provides an anticorrosive anchor bolt spare's anticorrosive coating has certain thickness, and the water proofness is good. Can separate basic concrete completely, can not form the bond stress of concrete to the crab-bolt, the crab-bolt is drawn perpendicularly in the basis, and the characteristic that the butyl rubber anticorrosive coating is never solidified can let the crab-bolt freely bear the tension in the concrete, can not receive basic concrete's hindrance.

Of course, as an alternative, a person skilled in the art can also sleeve an isolation pipe at the screw rod part of the anti-corrosion anchor bolt; preferably, the isolation pipe is made of any one of a PVC pipe and a PE pipe.

However, this does not indicate that the sheathing of the insulating tube belongs to a necessary step, and with the anti-corrosion arrangement of the present invention, the anti-corrosion anchor bolt can also achieve the effect of setting the insulating tube without setting the insulating tube.

The fourth purpose of the utility model is to provide a wind power supporting structure for support wind power tower cylinder's concrete foundation cushion cap, and bury underground three as the purpose in the concrete foundation prestressed anchorage bolt combination spare.

Preferably, the stand-alone power of the wind power tower is greater than or equal to 1.5MW (e.g., 1.6MW, 2.0MW, 3.0MW, 4.0MW, 5.0MW, 6.0MW, 7.0MW, 8.0MW, etc.), preferably greater than or equal to 2MW, and further preferably greater than or equal to 3 MW.

The stand-alone power of the wind tower of the present invention may include all models selectable on the market, such as 3.XMW series, 4.XMW series, 5.XMW series, 6.XMW series, 8.XMW series, etc.

It should be noted that the utility model provides an anticorrosion anchor bolt spare can be used for almost all wind power tower section of thick bamboo basis (including marine basic cushion cap), including the lower wind power tower section of thick bamboo of unit power (for example 1.5MW, 2.0MW etc.), also includes the higher wind power tower section of thick bamboo of unit power (for example 5MW, 6MW, 8MW etc.).

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses a vertical (along the axial) anticorrosive area of cladding in the polished rod outside of crab-bolt body, can reduce the introduction of cladding in-process air, reduce the length of overlap joint portion simultaneously, reduce the probability that anticorrosion anchor bolt spare was corroded.

Drawings

Fig. 1 is a front view of an anti-corrosion anchor bolt provided in embodiment 1 of the present invention;

fig. 2 is a schematic cross-sectional view along AA of the anti-corrosion anchor bolt provided in embodiment 1 of the present invention;

fig. 3 gives a front view of the corrosion-resistant anchor bolt provided in comparative example 1.

Detailed Description

To facilitate understanding of the present invention, the present invention has the following embodiments. It should be understood by those skilled in the art that the described embodiments are merely provided to assist in understanding the present invention and should not be construed as specifically limiting the present invention.

In the present embodiment, the corrosion resistance test is performed by using a 1000-hour neutral salt spray test, since the anchor bolt is long, and the size of the salt spray test chamber is generally not more than 1.2 meters long, and the salt spray test is to determine the corrosion resistance of the anchor bolt under extreme conditions, regardless of the length of the anchor bolt, the test object is an anchor bolt sample in the 1000-hour salt spray test. The anchor specimen differs from the anchor only in length, i.e., the anchor specimen also includes an anchor rod portion and an anchor threaded portion, but is shorter in length.

Example 1

A preparation method of an anti-corrosion anchor bolt piece specifically comprises the following steps:

(1) providing 20 anchors (with straightness less than or equal to 2mm/M and total length curvature less than or equal to 0.1%) of M48-8.8 grade as anchor body 120, and simultaneously providing anchor samples (hereinafter referred to as anchor bodies) for 1000-hour salt spray test; the anchor bolt member body 120 includes a polished rod portion and screw portions provided at both ends of the polished rod portion;

(2a) coating the outside of the polished rod part with residual lubricating oil in the machining process, and removing the residual lubricating oil;

(2b) heating the anchor bolt piece body 120 from room temperature to 250 ℃ at a speed of 13-17 ℃/min, then preserving the heat for 20min, then naturally cooling to room temperature, and then baking to obtain an outer side grease dry film protective layer of the anchor bolt;

(2) providing a macromolecule butyl self-adhesive waterproof tape with the same length as the polish rod of the anchor bolt body 120, extending and flatly paving the anticorrosive tape along the axial direction of the polish rod of the anchor bolt body 120, enabling the adhesive surface to be upward, rotationally rolling the polish rod of the anchor bolt body 120 from one side of the anticorrosive tape to the other side, so that the anticorrosive tape is rotationally adhered to the anchor bolt body 120 until the anticorrosive tape is completely coated along the circumferential direction of the polish rod of the anchor bolt body 120, and forming a strip-shaped overlapping part 110, wherein the length direction of the strip-shaped overlapping part 110 is parallel to the axis of the anticorrosive anchor bolt; the width of the strip-shaped overlapping part 110 is 15 mm; the anticorrosion coating layer 130 with the thickness of 1mm is formed by coating the anticorrosion coating layer;

(3) coating a rust-proof lubricating grease hydrophobic layer on the threaded part of the anchor member body 120 for corrosion prevention treatment, and then sleeving a plastic sleeve to prevent the rust-proof lubricating grease from contaminating surrounding articles;

(4) detecting leakage of the polished rod part of the anti-corrosion anchor bolt body 120 by using a 5kV electric spark detector, and recording leakage points; the defects of hollowing, edge warping and wrinkling are visually observed; the inspection result shows that the number of the one-time detection missing points of 20 anchor bolts is 0, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 0.

Fig. 1 is a front view of an anti-corrosion anchor bolt provided in embodiment 1 of the present invention; fig. 2 shows a schematic cross-sectional view along AA of the corrosion-resistant anchor bolt provided in embodiment 1 of the present invention. 110 is a strip-shaped overlapping part, 120 is an anchor bolt component body, and 130 is an anticorrosive coating layer. The polish rod portion of the anchor bolt body 120 of the corrosion-resistant anchor bolt is coated with a corrosion-resistant coating layer 130 and has a strip-shaped overlapping portion 110.

Examples 2 to 6

The difference from example 1 is only that the width of the elongated overlapping section is 5mm (example 2), 10mm (example 3), 25mm (example 4), 2mm (example 5), 30mm (example 6). The test result shows that the number of the one-time detection leak points of the 20 anchor bolts in the embodiments 2 to 4 is 0, and the number of the defects such as hollowing, edge warping, folding and the like is 0; the number of the one-time detection missing points of the 20 anchor bolts in the embodiment 5 is 1, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 0; the number of the missing points in one detection of 20 anchor bolts in the embodiment 6 is 0, and the number of the defects such as hollowing, edge warping, and wrinkling is 1.

Examples 7 to 10

The only difference from example 1 is that the thickness of the anticorrosion coating is 0.5mm (example 7) and 2.5mm (example 8), 0.4mm (example 9), 2.7mm (example 10). The test result shows that the number of the one-time detection leak points of the 20 anchor bolts in the embodiments 7-8 is 0, and the number of the defects such as hollowing, edge warping, folding and the like is 0; the number of the one-time detection missing points of the 20 anchor bolts in the embodiment 9 is 1, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 2; the number of the missing points in one test of 20 anchor bolts in example 10 was 0, and the number of defects such as hollowing, edge lifting, and wrinkling was 1.

Example 11

The only difference from example 1 is that step (2b) is: and heating the anchor bolt part body from room temperature to 240 ℃ at the speed of 13-17 ℃/min, preserving the heat for 30min, naturally cooling to room temperature, and baking to obtain the anchor bolt outer side grease dry film protective layer. The test result shows that the number of the one-time detection leak points of 20 anchor bolts is 0, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 0.

Example 12

The only difference from example 1 is that step (2b) is: and heating the anchor bolt part body from room temperature to 260 ℃ at the speed of 13-17 ℃/min, preserving the heat for 15min, naturally cooling to room temperature, and baking to obtain the anchor bolt outer side grease dry film protective layer. The test result shows that the number of the one-time detection leak points of 20 anchor bolts is 0, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 0.

Comparative example 1

The only difference from example 1 is that step (2) is:

provide anticorrosive area, will anticorrosive area certainly the one end of the polished rod portion of crab-bolt spare body carries out the spiral winding, and the surface of bonding towards anchor bolt spare body direction, the spiral winding in-process, the edge of the equal overlap joint of edge of every round goes up the edge of round, and controls lapped width and be 20mm, the thickness that anticorrosive area cladding formed is 1.2 mm. The test result shows that the number of the one-time detection leak points of 20 anchor bolts is 0, and the number of the defects such as hollowing, edge warping, wrinkling and the like is 10. Fig. 3 gives a front view of the corrosion-resistant anchor bolt provided in comparative example 1. The outside spiral cladding of the smooth rod portion of anticorrosion anchor bolt spare has anticorrosive area, and the overlap joint portion is the heliciform, is heliciform overlap joint portion 210.

Comparative example 2

The hot dip galvanizing corrosion prevention method comprises the following steps:

providing an anchor bolt sample of M48-8.8 grade, cleaning the surface before the anchor bolt is subjected to corrosion prevention, cleaning oxide skin, rust, oil stain and other impurities, performing surface sand blasting treatment, immersing the whole anchor bolt into a zinc pool, taking out, cooling and passivating to obtain a corrosion-resistant layer with the thickness of 70-90 mu M.

Comparative example 3

Dacromet preservation comprising the steps of:

the method comprises the steps of providing an anchor bolt sample of M48-8.8 grade type, cleaning the surface before anchor bolt corrosion prevention, cleaning oxide skin, rust, oil stain and other impurities, performing surface sand blasting treatment, and enabling the cleanliness to reach Sa2.5. The anchor bolt is integrally coated with Dacromet liquid (JH-9390), and the anticorrosive coating with the thickness of 8-16 mu m is obtained by three-coating and three-baking.

Comparative example 4

Oiling and corrosion prevention of the heat shrinkable sleeve, comprising the following steps:

providing an anchor bolt sample of M48-8.8 grade model, cleaning the surface before the anchor bolt is anticorrosive, cleaning oxide skin, iron rust and other impurities, uniformly coating grease on the surface of the anchor bolt, penetrating the heat-shrinkable sleeve into the anchor bolt, heating the heat-shrinkable sleeve by using a drying gun to shrink the heat-shrinkable sleeve onto the surface of the anchor bolt, and forming a heat-shrinkable sleeve anticorrosive layer of 0.7-0.8 mu M.

And (3) performance testing:

the corrosion-resistant anchors of the examples and comparative examples were subjected to the following performance tests:

(1)1000 hour salt spray test: the test method is GB/T10125-2012 (5% sodium chloride solution is tested for 1000h at the pH value of 6.8 at the temperature of 35 ℃), the anchor bolt sample is subjected to a salt spray test for 1000h under the tension state of 0.7 times of the yield strength standard value, then the anchor bolt piece is taken out, the test defect area percentage is calculated), and then the corrosion resistance grade is judged according to the GB/T6461 standard. Test results show that after the anti-corrosion anchor bolt sample provided in the example 1 is subjected to a salt spray test for 1000 hours, the anti-corrosion coating layer is removed, the surface of the anchor bolt is not corroded, only the adhesive tape remains, and the grade 10 is judged according to the GB/T6461 standard; after the anti-corrosion anchor bolt sample provided in the comparative example 1 is subjected to a 1000-hour salt spray test, the anti-corrosion coating layer is removed, the surface of the anchor bolt has micro corrosion and adhesive tape residue, and the grade 9 is judged according to the GB/T6461 standard; after the anti-corrosion anchor bolt sample provided by the comparative example 2 is subjected to a salt spray test for 1000 hours, the anti-corrosion coating layer is removed, white rust on the surface of the anchor bolt is serious, red rust appears in most areas, and the sample is judged to be grade 6 according to the GB/T6461 standard; after the anti-corrosion anchor bolt sample provided by the comparative example 3 is subjected to a salt spray test for 1000 hours, the anti-corrosion coating layer is removed, white rust and a small amount of red rust appear on the surface part of the anchor bolt, and the grade 7 is judged according to the GB/T6461 standard; after the anti-corrosion anchor bolt sample provided by the comparative example 4 is subjected to a salt spray test for 1000 hours, white rust does not appear on the surface of the anchor bolt after the anti-corrosion coating layer is removed, and the red rust phenomenon is serious, and the anti-corrosion anchor bolt sample is judged to be grade 7 according to the GB/T6461 standard.

We also performed a 1000 hour salt spray test on all of the corrosion resistant anchor pieces provided in the examples and comparative examples, with the test results shown in table 1:

TABLE 1

As can be seen from table 1, the corrosion-resistant anchor bolt provided by the application can reach a level of more than 9 levels in a 1000-hour salt spray test, that is, the defect area percentage is less than or equal to 0.1%, especially, the width of the strip-shaped overlapping part is 5mm to 25mm, the thickness of the corrosion-resistant coating layer is within a range of 0.5mm to 2.5mm, and the corrosion-resistant anchor bolt can reach a level of 10 levels in a 1000-hour salt spray test, that is, the defect area is 0.

To better illustrate the advantages of longitudinal cladding, the following is a comparison of the process conditions for helical cladding and longitudinal cladding (table 2).

TABLE 2

Wherein, the process of longitudinal cladding is referred to example 1, and the process of spiral cladding is referred to comparative example 1.

As can be seen from table 1, the anti-corrosion method provided by the utility model can save about 80% of the anti-corrosion belt material by reducing the length of the lap joint part; in addition, the coating mode reduces the coating stroke by coating the long edge of the anti-corrosion belt, greatly improves the coating work efficiency and shortens the coating time by more than 3 times.

The applicant states that the present invention is described in detail by the above embodiments, but the present invention is not limited to the above detailed structure, i.e. the present invention can be implemented only by relying on the above detailed structure. It should be clear to those skilled in the art that any improvement of the present invention is to the equivalent replacement of each component of the present invention, the addition of the auxiliary components, the selection of the specific connection relationship, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims (12)

1. The anti-corrosion anchor bolt piece is characterized by comprising an anchor bolt piece body and an anti-corrosion coating layer arranged on the outer side of a polished rod part of the anchor bolt piece body; the corrosion-resistant coating has a bridging portion extending axially along the anchor bolt member body.

2. The anti-corrosion anchor bolt of claim 1, wherein said anti-corrosion coating has a thickness of 0.5 to 2.5 mm.

3. The anti-corrosion anchor bolt of claim 1, wherein said bridge has a width of from 2mm to 30 mm.

4. The anti-corrosion anchor bolt of claim 1, wherein said bridge has a width of 5mm to 25 mm.

5. The anti-corrosion anchor bolt member of claim 1 in which said corrosion resistant coating is a polymeric butyl self-adhesive waterproof tape coating.

6. The anti-corrosion anchor bolt of claim 1 wherein said anchor bolt body includes a dry film grease protective layer disposed on a surface of said anchor bolt.

7. The anti-corrosion anchor bolt member of claim 6 wherein said dry film grease protective layer has a thickness of from 1 μm to 4 μm.

8. The anti-corrosion anchor bolt of claim 1 wherein said anchor bolt body includes a hydrophobic layer of grease disposed outside of the threaded portion.

9. The anti-corrosion anchor member of claim 8, wherein said hydrophobic layer is a layer of rust inhibiting lubricating grease.

10. A pre-stressed anchor assembly, wherein the anchor assembly comprises an upper anchor plate member, a lower anchor plate member, a plurality of corrosion-resistant anchor members as claimed in any one of claims 1 to 9 for securing the upper and lower anchor plate members.

11. The pre-stressed anchor bolt assembly according to claim 10, wherein a spacer tube is partially sleeved on the corrosion-proof anchor bolt member between the upper and lower anchor plates.

12. A wind powered support structure comprising a wind tower, a concrete foundation cap for supporting the wind tower, and a pre-stressed anchor bolt assembly as claimed in claim 10 or 11 embedded in the concrete foundation.

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