WO2015016551A1

WO2015016551A1 - Method for sealing bolt assembly structure

Info

Publication number: WO2015016551A1
Application number: PCT/KR2014/006871
Authority: WO
Inventors: 문영준; 정혜림; 문수창; 문인준
Original assignee: Moun Young Joon; Jeong Hae Lim; Moon Su Chang; Moon In Joon
Priority date: 2013-07-29
Filing date: 2014-07-28
Publication date: 2015-02-05

Abstract

The present invention relates to a method for sealing a bolt assembly structure, comprising: coating the surfaces of unit members forming the structure with thermoplastic resin powder; providing the structure by assembling the unit members by bolts; and heating bolt assembly parts and joint parts while spray coating the same with the thermoplastic resin powder, such that a surface coating layer and a spray-coating layer are melted and combined into one body so as to seal the bolt assembly parts and the joint parts.

Description

Sealing method of bolted structure

The present invention relates to a method for sealing bolted prefabricated structures. More particularly, the present invention relates to a method of sealing a corrugated liquid or a part of a bolted surface in which the corrosive liquid is stored or in contact with a corrosive gas. In the process of surface-coating plastic resin and assembling the bolt into the bolt-assembled structure having the required shape and structure, the bolt is assembled without using a gasket or sealant, and the bolted surface and the surrounding parts of the bolted joint are bonded to the plastic spray coating machine. After melting the surface layer of the thermoplastic resin coated on the bolted surface layer by heating with a gas torch, joining them in one body, and then assembling the bolt by spray coating the surface and surrounding parts of the thermoplastic resin powder bolted with a plastic spray coating to the required thickness. Surface nose It relates to a method of sealing the surface and the bolt prefabricated structure makes the sealing of the total area of the surface located in the peripheral region.

The bolt-assembled structure of the bolt-assembled tank, flange-mounted pipe or steel I-beam (hereinafter referred to as 'bolt-assembled structure'), which stores conventional corrosive liquid or contacts with corrosive gas, constitutes the bolted structure. In order to prevent leakage or corrosion of the surface of the member, a liquid epoxy or polyurethane is coated with a liquid sprayer, or a surface coating material of powder epoxy or powder polyester or powder glass is coated using a powder coater. After that, the gasket is used between the bolt assembly surfaces at the site where the bolt assembly structure is to be installed, or the bolt assembly is performed without using the gasket to construct the required bolt assembly structure. Sealing is applied by applying sealant with elasticity such as corrosion prevention and leakage prevention.

1 and 2 are bolted coating panels using metal gaskets or sealants that are surface coated with a liquid thermosetting plastic resin according to the prior art or surface coated with glass powder, and used as a bolt assembly using a gasket or sealant. Is a photograph showing the leaked state of the leaked bolt assembly.

1 is a method in which a metal panel coated with glass powder on both sides without gaskets is prepared and bolted, and then the bolt assembly is sealed using an elastic sealant material such as silicon, but as time passes. The thickness of the glass coating coated on the edge that forms the boundary of the bolt hole that formed the bolt hole of the glass-coated metal plate material of the bolt assembly part is thin, and the bolt depends on the climate used by the sealant and the temperature difference between the liquid used. The surface-coated glass and the thermal expansion coefficient of the prefabricated glass coating panel is different, there is a gap between the glass-coated surface and eventually peeled off, water leakage occurs, or the corrosive liquid penetrates into the sealant and is damaged by corrosion.

In addition, Figure 2 is a bolt-mounted bolt-mounted metal panel with a flange-mounted bolt-mounted metal panel formed with a powder epoxy coated bolt hole as a bolt assembly flange-shaped round metal tank, gasket, the pressure difference tightened during assembly of the bolt As a result of the passage of time, leakage occurred due to the gap between the bolt assembly and its surrounding location.

As another example of the prior art, one of the bolted structures made of metal is a bolted square tank, a bolted round tank or a bolted steel structure that bolts I-beams to each other, or the bolted portion of the steel piers is partially tightened or There was a serious problem of causing a safety accident by loosening the bolts due to corrosion or vibration due to vehicle traffic.

In addition, in order to prevent corrosion, a square tank or a round tank or a bolt-assembled metal panel, a glass fiber reinforced panel, or a wood panel, which are coated with a thermoplastic resin such as polyethylene or polypropylene, is put in a gasket and bolted together. Bolted structures can be constructed, such as concrete-integrated formwork or concrete-integrated liquid storage tanks, which contact the surface with concrete, or with water, seawater or chemicals.

However, even when constituting the bolt-assembled structure of the concrete integral formwork or the concrete integral liquid storage tank as described above, when the bolt is assembled using a gasket or sealant, when the concrete is poured into the concrete integral formwork, the moisture contained in the concrete is assembled into the bolt. Leaks in one area or corrosion by chemicals occurs.

Therefore, the present invention has been made in consideration of the prior art as described above, to increase the area to seal the bolt assembly structure to prevent leakage, and to provide a corrosion protection function to withstand strong corrosive liquids or gases such as acids and alkalis It is to provide a sealing method of the prefabricated structure.

In another aspect, the present invention by applying a surface coating of a thermoplastic resin resin having electrical conductivity to the bolted assembly structure by applying a leak-proof inspection to detect the occurrence of pinholes on the surface layer of the bolt assembly through the electrostatic inspection can reinforce the functionality to prevent leakage have.

In addition, the present invention does not require the use of gaskets or sealants in the bolted structure can save material and save time and manpower costs.

In addition, the present invention can further enhance the leakage preventing functionality by sealing the bolt assembly structure to a much larger area than the case of bolt assembly using a gasket.

In addition, the present invention prevents the safety accident that the bolt prefabricated structure is destroyed or damaged by loosening the bolt in the bolt assembly.

Sealing method of the bolt assembly structure according to an aspect of the present invention in order to achieve the above object is a plastic spray coating machine or plastic powder coating line on both sides or one side or bolt assembly to the surface where the bolt holes abut each other. Or a plurality of bolt-fabricated metal panels or glass fiber reinforced plastic panels coated with plastic powder fluidized bed sedimentation coating methods, or wooden panels made of wood chips or wood sawdust or wood (afterwards made of wood chips or wood sawdust or wood) Wood panels are collectively referred to as wood board panels.) Or glass-coated panels or bolted panels that are surface-coated with powdered epoxy or powdered polyester. Powder coated Preparing a metal panel or a glass fiber reinforced plastic panel or a wood panel panel with a plurality of bolt-assembled structural panels, collectively referred to as bolt-assembled coated panels. Installing the prepared bolted coating panels bolted to the bolt assembly structure (S200) and bolted to the bolted coating panels to form a bolted structure to combine the bolted coating panels to abut each other bolted surface And preheating by heating with a gas torch or a plastic spray coating on the coating layer of the thermoplastic plastic resin surface-coated in the peripheral portion; And the thermoplastic resin of the bolted surface and the peripheral part of the pre-heated bolted coated panels is gelled, and the thermoplastic resin of the bolted surface and the peripheral part of the bolted coated panel is gelled Press the bolts and nuts which are assembled to the bolts and press them tightly, and select the thermoplastic resin resin powder having the necessary functionality on the bolted surface and the surrounding parts in close contact, and generate the spark with the plastic spray coating Spraying plastic resin powder, and applying the heat of the flame of the plastic spray coating machine to the surface of the thermoplastic resin resin powder to be sprayed, the thermoplastic plastic resin coated on the bolt assembly in the preparation step (S100) of the bolt assembly coating panel; Heat coated by plastic spray coater The surface coating step of bonding the plastic plastic resin while melting into one body; The method of sealing the bolt assembly structure (S300).

According to the embodiment of the present invention, the gasket is not used, thereby reducing the material and reducing the process. As the surface of the structural member is coated with thermoplastic resin, there is almost no water absorption, and thus corrosion resistance, heat resistance, and chemical resistance As the surface-coated thermoplastic resin powder is preheated by the heat sprayed from the plastic spray coating machine and melt-bonded together with the sprayed thermoplastic resin powder, sealing is performed on the bolted portions and the joint surfaces of the inner and outer surfaces of the structure. As a result, the problem of leakage or corrosion occurring in the sealing method of the gasket or sealant material used in the prior art is fundamentally solved, and the bolt is prevented from loosening.

1 and 2 are photographs showing the corrosion state of the bolted portion of the metal structure.

Figure 3a is a process flow chart showing a sealing method of the assembled bolt structure according to the present invention.

Figure 3b is a process flow chart showing a sealing method of the bolt-assembled metal structure according to an embodiment of the present invention.

Figure 4 is a schematic diagram showing the assembly process of the curved bolt assembly coating panel.

Figure 5 is a schematic diagram showing the assembly process of the flanged bolt assembly coating panel.

Figure 6 is a schematic diagram for explaining the spray coating of the bolt-assembled structure according to the present invention.

FIG. 7 is a partially cutaway side view of the plastic spray coater of FIG. 6. FIG.

8A to 8C are cross-sectional views sequentially illustrating a process of surface coating and sealing a surface and a peripheral portion of a plate-shaped and curved bolt-assembly structure.

9A to 9C are cross-sectional views sequentially illustrating a process of surface coating and sealing a surface and a peripheral portion of a flanged bolt assembly.

10 is an exemplary view of bolt assembly of a prefabricated bolt board panel structure according to another embodiment of the present invention.

FIG. 11 is a photograph showing a bolted state in which two separated bolted metal panels, which are surface-coated with polyethylene resin powder, are brought into contact with each other.

FIG. 12 is a photograph showing a state in which the surface coating layers of the bolt-assembled metal panel assembled by bolts are heat-bonded together in FIGS.

13 and 14 are photographs showing a state in which the surface and the peripheral portion of the bolt assembly by the thermal spray coating and the seam portion of the bolted metal panels are seamlessly surface-coated and sealed.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

As a bolt assembly structure of the preferred embodiment of the present invention, the tank for storing the liquid by directly connecting between the bolt assembly coating panels assembled in contact with the bolts without using a gasket or sealant was exemplified as an example of a bolt assembly structure, Steel structures or glass fibers, such as H-beams or I-beams, of flanged or non-flange pipes, or of steel coated with thermoplastic resin on the bolt-assembly surface. Reinforced plastic panels, wooden boards or glass-coated panels or bolted panels coated with powder epoxy or powdered polyester resin can also be applied to the present invention if the thermoplastic resin resin has a surface-coated surface at the bolt assembly. Are all included within the scope of the present invention. Find out in advance.

Figure 3a shows a flow chart for the sealing method of the prefabricated bolt structure according to an embodiment of the present invention.

3A is shown,

A preparatory step (S100) of preparing and coating a thermoplastic resin powder on a unit member for constituting the bolt assembly structure;

A structure installation step (S200) of installing the structure by bolt-assembling the surface-coated unit members;

The thermally coated thermoplastic resin powder and the thermally sprayed thermoplastic resin powder are melt-bonded by applying heat to the bolt assembly portion of the bolt-assembled structure and the abutting portion of the unit member while heat-bonding, without seam marks. It is characterized in that it comprises a sealing step (S300) to seal.

As the unit member forming the structure in the preparation step (S100) it may be applied to the metal panel or wood panel or plastic panel or flange bolt prefabricated pipe, bolt prefabricated steel, etc. In the following description of the metal panel will be described as an example.

The structure installation step (S200), the unit members constituting the structure can be installed by assembling the bolt assembly or screw fastening the structure, using a padding board (reinforcement plate) or metal bonding angle, such as bolt assembly or screw assembly It may be installed, the thermoplastic resin in the entire surface including the surface of the unit member and the bolt hole formed in the panel, the padded board, the padded board, the metal bonding angle for the assembly of the structure in the preparation step (S100) The powder is prepared by surface coating.

The sealing step (S300),

Heating and preheating the heat generated by burning the gas or generating hot air or burning the combustion gas by burning a gas or hot air or a plastic spray coating on the bolt / screw assembly surface and the peripheral part (S310); ; A pressure close tightness step (S320) of pressing the bolts and nuts assembled with the bolts in a state in which the thermoplastic resin coating layer is gelled (S320); The thermally coated thermoplastic resin powders with the required functionality selected by the plastic spray coating on the surface of the bolts and the surrounding parts are sprayed to the required thickness, and the surface-coated surface layer and the thermal spray coating layer are melted together to be bonded together so that there are no seams. It is characterized by performing a thermal spray coating step (S330) for the surface coating in a seamless state.

In order to explain the present invention, a bolt assembly structure is constructed of a bolt assembly metal panel in which bolt holes are formed among the bolt assembly coating panels. As an example, the bolt assembly structure will be described with reference to FIG. 3B.

Preparation step (S100)

In consideration of the bolt-assembled structure to be installed, a plurality of rectangular metal sheets 202 having the required shape, size, and thickness are prepared, and pressed on all four sides of the prepared metal sheets 202, or a CNC cutter or a laser cutter. After forming a plurality of bolt holes 211 of a predetermined size in the form of thermal insulation or multiple rows through, then the metal plate 202 is put into a roller-type roll bending machine to roll bend to the required curved shape to form a curved bolt-shaped metal panel Produce 210 (S120).

Figure 4 is a schematic diagram showing the assembly process of the curved bolt assembly coating panel, Figure 5 is a schematic diagram showing the assembly process of the flanged bolt assembly coating panel.

Unlike the curved metal panel 210, the plurality of bolt holes 411 are formed in the metal plate 402, and then the flanges 413 are formed by bending the four edges formed with the plurality of bolt holes 411 to one side. The flanged metal panel 410 may be manufactured.

The shot or air blaster is performed on both surfaces of the curved or

flanged metal panels

210 and 410 thus manufactured, and surface pretreatment is performed such that the surface profile is 50 to 100 μm (S140).

The surface pretreated

metal panels

210 and 410 are put into an electric, propane gas or natural gas combustion oven, or preheated to a predetermined temperature range through an induction heater of high frequency (S160). The range of the preheating temperature may be changed according to the range of the inherent melting temperature of the thermoplastic resin resin to be thermally coated in the sealing step S300 and the thermoplastic resin to be surface coated.

Subsequently, both surfaces of the

preheated metal panels

210 and 410 are surface coated with thermoplastic resin resin (S180).

After the surface coating (S160) it may be subjected to post-heating (S190). The surface-coated

metal panels

210 and 410 in an oven having a heat temperature (eg, melting temperature of 330 ° C. or higher) in a unique melting temperature range of the thermoplastic resin surface coated in the surface coating step (S180). By the post heating, the thermoplastic resin coated on the surface of the

metal panels

210 and 410 eliminates the phenomenon of pinholes in the molten surface layer, and the polymer of the thermoplastic resin coated with the surface layer is sufficiently melted and stabilized. To keep it in a state.

In addition, as another embodiment of the present invention, the type of thermoplastic resin resin powder coated on the surface of the bolt-assembled coated panel or bolt-assembled structure according to the present invention may use a plurality of types as follows. It is preferable that the thermoplastic resin resin powder to be bonded or molded comprises a main component, which is melted by a plastic extruder, and which has a particle size of 5 to 500 μm as a powder ground by a general mill or a lyophilized mill, but with a melt flow. More preferably, the Melt Flow Rate is as high as possible.

1. Modified Polyethylene Powder

75 to 99.5% of polyethylene resin and 0.5 to 20% of ethylene acrylate or methyl acrylate (Methyl acrylate) in order to increase the adhesion of the polyethylene resin to the polyethylene resin Mixing with each other to crush the resin in the plastic pallet state made through a plastic extruder, has a melting temperature range of 70 ~ 230 ℃. Here, the polyethylene resin includes both ultra high molecular weight polyethylene resin, low density / high density / linear low density polyethylene resin or crosslinked polyethylene resin.

2. Modified Polypropylene Powder

In order to increase the adhesive strength of 75 to 99.5% of polypropylene resin and the polypropylene resin, 0.5 to 20% of component of maleic anhydride or methacrylate (Methyl acrylate) Mixing with propylene resin and pulverizing the resin in the pellet state made through a plastic extruder, has a melting temperature range of 70 ~ 230 ℃.

3. Polyethylene resin powder

Ultra high molecular weight polyethylene resin, low density / high density / linear low density polyethylene resin, or crosslinked polyethylene resins are all included and has a melting temperature range of 70 ~ 230 ℃.

4. Polypropylene Resin Powder

It has a melting temperature range of 105 ~ 240 ℃.

5. Polyamide resin powder.

It has a melting temperature range of 130 to 260 ° C.

6. Polyolefin-Polyamide Composite Plastic Resin Powder

A resin powder obtained by mixing 25 to 75% by weight of the polyamide resin powder of 5 to 25 to 75% by weight of the plastic resin of any one of 1 to 5, which is formed through a plastic extruder and a grinder, and has a melting temperature of 130 to 260 ° C. Has a range.

7. Polyvinylidene fluoride (PVDF) resin powder

It has a melting temperature range of 135 to 210 ° C.

8. Ethylene Tetrafluoroethylene (ETFE) Resin Powder

It has a melting temperature range of 150-285 ° C.

9. Ethylene Chlorate Tetrafluoroethylene (ECTFE) Resin Powder

It has a melting temperature range of 150-285 ° C.

10. Fluoroethylene propylene (FEP) resin powder

It has a melting temperature range of 165 ~ 300 ℃.

11. Fluororesin polyfluoroalkoxy (PFA) resin powder

Melting temperature ranges from 210 to 330 ° C.

12. Polyphenylene Sulfide Resin Powder

It has a melting temperature range of 150 ~ 265 ℃.

13. Polyetheretherketone resin powder

It has a melting temperature range of 165 ~ 330 ℃.

14. Fluoropolymer Composite Thermoplastic Resin Powder

55 to 90% by weight of the fluorine resin of any one of 7 to 11, 10 to 45% by weight of any one selected from 5 polyamide resin powder, 12 polyphenylene sulfide resin powder or 13 polyether ether ketone resin powder Resin powder mixed with each other and formed through a plastic extruder and a pulverizer, has a melting temperature range of 165 ~ 335 ℃.

15. Composite plastic resin powder.

As a resin powder which mixed the inorganic compound, such as rubber or powder epoxy or powder polyester, ceramic, glass, or glass fiber, with 1-25 content% of the resin powder of 75-99% of the said resin powder of 1-14, It has a melting temperature range of 330 ° C.

Herein, inorganic compounds such as rubber, powder epoxy, powder polyester, powder glass fiber, powder glass or powder ceramic are pulverized by a pulverizer and are limited to those having a particle size of 1 to 150 μm.

Meanwhile, the prefabricated coating panel made of metal panel or glass fiber reinforced plastic material or wood board material, and the prefabricated glass prefabricated panel, or the prefabricated bolt surface panel coated with powder epoxy or powder polyester are prepared in step S100. Surface coating (S180) of the plastic resin powder is one or one selected from 1 to 15 described above having the necessary functionality to the

preheated metal panel

210, 410 or one side or both sides of the bolt-assembled coating panel or bolt assembly. The multi-layered thermoplastic resin resin powder may be coated by powder coating with a plastic powder coating machine, or may be immersed for several seconds in a fluidized bed bed in which the thermoplastic resin resin powder is suspended, or may be thermally coated with a plastic thermal spray coating machine.

In this case, the thickness of the surface coating with the thermoplastic resin resin powder is preferably selected to a thickness of 100 ~ 800㎛.

Because the thickness of the surface coating is 800㎛ or more, in the next sealing step (S300), the thermoplastic resin powders coated on the surface of each of the bolted

coating panel

210, 410 according to the thermal spray coating of the thermoplastic resin powder is melted with each other It combines and integrates a lot of time and heat energy.

In addition, after assembling the bolt made of the bolt assembly structure which is one of the sealing process of the present invention, the surface-coated thermoplastic plastic resin is gelled by hot air preheated with a gas torch or a plastic spray coater. If it flows down, the bolt assembly will loosen, and the bolt and nut should be pressurized and forced to close tightly.

In addition, when the thickness of the surface coating is 100㎛ or less, when the surface of the thermoplastic plastic resin powder particles having a size of 300㎛ or more in the powder coating machine or a fluidized bed bed method, the bolt-assembled coating panel 210 (410), the thickness of the surface coating is not uniform, or the particles of the thermoplastic resin powder is not sufficiently applied on some surfaces, as a result of which the surface of the bolted coating panel is exposed, resulting in corrosion phenomenon It is easy to do.

And the thickness of the surface coating to the thickness portion of the bolt holes 211, 411 in the bolt assembly coating panel or bolt assembly structure according to the present invention may have a thickness of 100 ~ 500㎛, preferably 150 ~ 300㎛.

This means that if the surface coating thickness of one side of the bolt hole has a thickness of 300 μm or more, the bolt diameter of the bolt 110 and the outer diameter of the body when the bolt is assembled in step S200 is installed as a subsequent assembly structure. This is because the inner diameter of the 411 is reduced to make it difficult to penetrate the bolt 110 or assemble the bolt.

Here, one of the present invention, a bolt-assembled metal panel which is already glass-coated on one side or both sides, or coated with epoxy powder or polyester powder, can also be used as one embodiment to which the present invention is applied.

Because, in the case of the metal panel surface-coated with the above-mentioned thermosetting plastic resin of glass powder or powder epoxy or powder polyester, the part where the bolt hole is formed in the preparation step (S100) of preparing the surface coated unit member of the present invention Even if the surface-coated thermoplastic resin powder is only coated on the surface of the bolt assembly by powder coating or plastic spray coating method, the method is applied without the gasket or sealant of the present invention and the method of sealing while spraying the thermoplastic resin is leaked. This also can be carried out within the scope of the present invention because it can be applied to the action of the sealing to prevent corrosion and bolt loosening.

In another embodiment of the present invention, when the modified polyethylene powder of 1 or 2 and the modified polypropylene powder are used as the thermoplastic resin resin powder, the thermoplastic resin resin of 1 or 2 is first powder-coated, and then the 3 or The polyethylene resin powder and the polypropylene resin powder of 4 may be surface-coated in a secondary manner, and the above-described bolt holes may be formed, and the present invention may be applied to a metal panel having glass coating on one side or both sides or powder coating of epoxy powder. It is within the scope of the present invention because it can be applied as the technology of.

This is because the polyethylene resin powder and the polypropylene resin powder of 3 or 4 have good chemical resistance, but the surface energy is low, so that even if the surface coating is applied to the surface of the preheated metal panel by powder coating, the adhesive force may be easily peeled off due to low adhesive strength. After the primary powder coating, the plastic resin powder of 1 or 2 having good adhesive strength is subjected to surface coating for the second time.

Bolt assembly structure installation step (S200)

Bolt prefabricated

coating panel

210, 410 prepared in step (S100) bolt prefabricated

coating panels

210, 410 are formed with a plurality of bolt holes 211, 411, both sides of the thermoplastic resin Since the surface coating is made of powder, the metal panels 210, for example, 2 to pass through the bolt holes 211 and 411 of the respective bolt-assembled

coating panels

210 and 410, as shown in Figs. After stacking four to four sheets up, down, left, and right, or facing the flanges 413 forming the respective bolt holes, insert the bolts 110 through the bolt holes 211 and 411 through the nuts and washers ( Not shown) and the nut 120 are assembled by bolt assembly 200 (400) bolt assembly.

The assembled bolt-assembled

structure

200, 400 is assembled according to the shape of the bolt-assembled structure to be assembled using equipment such as a crane, but in the embodiment described in the specification of the present invention when configuring a circular or square liquid storage tank In the concrete floor, bolt assembly of the body that forms the wall first, and then form the roof, and finally, the bolt installation structure is connected to the concrete floor by connecting the bolted coating panel with the body of the wall to form a bolted structure ( S200) may be performed.

The bolt, nut or washer may be made of a metallic material such as carbon steel or stainless steel. Alternatively, a zinc plated or liquid epoxy may be used to prevent corrosion, but a highly releasable ceramic or liquid polytetrafluoride may be used. Surface coating or surface coating with a high melting temperature and low surface energy, such as ethylene (PTFE) is not desirable.

The reason is that when the thermal spray coating of the plastic resin powder using a plastic spray coating machine in the sealing step (S300), there is a problem that the adhesion between the coating surface and the bolt, nut or washer is easily peeled off.

Therefore, the surface of bolts, nuts or washers should be kept free from contaminants or rust such as oil, water, soil, or dust, or exposed to a clean surface by pretreatment or cleaning with an air blaster. It is desirable to be.

Sealing step (S300)

In the above bolt assembly structure installation step (S200) of the bolt assembly surface and the peripheral parts of the assembled bolt assembly panel (210) (410) and the bolt assembly coating panel connected by overlapping the bolt assembly coating panel to the joint surface The thermoplastic resin powder selected as necessary is preheated using the plastic thermal spray coating machine 700 or a gas torch or a gas or an electric hot air blower.

When the bolted surface and the surrounding area are gelled by the preheated heat and the thickness of the surface layer of the thermoplastic resin coated on the bolted surface is thick and flows down, the bolted bolt is forced. Pressurize and tighten.

When the bolt is forcibly tightened and tightly adhered, the thermoplastic resin powder selected as necessary is sprayed onto the plastic spray coating to add the heat of the combustion gas or the flame that burned the combustion gas, or passes through the flame of the plastic spray coating machine. Spraying the powder and melting with heat to seal the surface coating process (S300).

Here, one of the plastic spray coating machine used in the process of sealing the thermoplastic resin powder in order to explain the present invention in more detail will be described below with reference to FIGS.

The plastic spray coating machine 700 includes a spray gun 710, a combustion gas storage container 730 for storing combustion gas such as propane gas and butane gas, and a combustion gas with a valve for transferring the combustion gas to the spray gun 710. The transfer line P1, the air compressor 770, the compressed air transfer line P4 with a valve which transfers the compressed air through the air compressor 770 to the spray gun 710, and said 15 kinds of thermoplastics Resin powder transfer line with a valve for transporting the thermoplastic resin powder stored in the storage container 750 to the spray gun 710 for storing the thermoplastic resin resin powder arbitrarily selected from the plastic resin powder. Plastic resin powder (P3) spraying and spraying the thermoplastic resin powder stored in the storage container (750) to the outside through the plastic resin powder outlet (N55) of the spray gun 710 (P) p).

More specifically, the thermoplastic resin powder stored in the storage container 750 is transferred through the resin powder conveying line P3, and the compressed air generated in the air compressor 770 is compressed through the compressed air conveying line P4. Conveyed, mixed in one mixing line P2, and supplied to the spray gun 710, and the combustion gas of either propane gas or butane gas is supplied to the internal gas of the spray gun 710 via the combustion gas transfer line P1. After being supplied to the nozzle N60, the ignition combustion generates flame or hot air Fl, and the plastic resin powder ejected from the plastic resin powder outlet N55 of the spray gun 710 is spark generated from the spray gun 710. Or it passes through the heat (Fl), the heat energy is instantaneously melted and inserted into the bolt holes 211, 411 of the

metal panel

200, 400 of the present invention and the bolt assembly portion and the metal located on the inner or both sides Panels The surface coated with the desired thickness and the area on the surface of the seams are connected to each other are formed.

On the other hand, the combustion gas-type plastic spray coating machine 700 may be selectively operated according to the situation as follows by operating the valve mounted on the transfer hose (P1) (P2) connected to the spray gun 710.

First, the combustion gas may be ignited and combusted to generate only flame or heat so that the surface may be coated on the entire surface of the bolt-assembled structure of the bolt-assembled structure of the present invention, or the surface of the bolt-assembled coated panel may be located at a specific position as necessary. Preheating the surface area is limited, or secondly, the combustion gas is ignited and combusted to generate sparks or hot air, and the thermoplastic resin powder is sprayed and sprayed, and heat is applied to the thermoplastic resin powder to be sprayed, and the thermoplastic resin powder Is melted and surface-coated on the surface of the bolt-assembled structure in the required position, or thirdly, only plastic resin powder is sprayed and sprayed onto the required surface of the metal panel without generating sparks or heat and then heated by heating with a plastic spray coating machine. Or spray-coated thermoplastic flasks To create heated to sufficient after the resin powder is melted in a stable state so that the coated surface.

In addition, the plastic thermal spray coating machine may be a plastic thermal spray coating method of the method of spray coating the selected thermoplastic plastic resin powder into the flame generated by burning the combustion gas to obtain the heat of the flame to melt and surface-coating. Also, as one of the plastic spray coating machine, spraying the thermoplastic resin powder, one or more gas torchs are mounted on the outside of the spray gun of the plastic spray coating machine, so that the flame is generated along the copper wire sprayed with the thermoplastic resin powder. In addition, a plastic spray coating of a method in which the thermoplastic resin resin powder sprayed by applying heat of a flame is thermally melted and surface coated can also be used as one of the tools used in the present invention.

8 and 9 illustrate cross-sectional structures of the bolt-assembled structure installed by the sealing method of the bolt-assembled gold structure of the present invention configured as described above.

First, as illustrated in FIGS. 8A and 9A, the present invention will be described in more detail. A plurality of bolt holes 211 and 411 may be formed to form a

surface coating layer

212 and 412. Bolt holes 211 of 402 overlap or align the flanges 413 on which the bolt holes 411 are formed to abut each other.

Subsequently, the bolts 110 are inserted into the bolt holes 211 and 411, and the

bolt assembly structures

200 and 400 are assembled by fastening the nuts 120 through the washers 130.

The bolt assembly site and the seam around 300 are preheated to the bolted surface and the peripheral area of the bolted structure using a plastic spray coater (not shown) or a gas torch or an electric hot air blower.

When the thermal spray coating of the thermoplastic resin powder to a thickness of 200 ~ 1,500㎛, as shown in Figures 8b and 9b, the bolt fastened to the bolt assembly portion and the seam around the 300 and the bolt holes 211, 411 As the 110, the washer 130 and the nut 120 are preheated by the flame of the plastic spray coating machine, the

surface coating

212 and 412 of the bolt assembly site and the seam around 300 melt with each other.

At the same time, as shown in FIGS. 8C and 9C, the bolt 110, the washer 130, and the nut 120 fastened to the bolt holes 211 and 411 by thermoplastic resin sprayed through a plastic spray coating machine. As the thermal spray coating layer 350 is formed on the bolt assembly and the seam around 300, the inner or both sides of the metal tank as the bolt-assembled metal structure may be seamlessly coated to perform a sealing to fundamentally block leakage. .

The thermoplastic resin powder sprayed in the sealing step (S300) is the same type as the thermoplastic resin resin used in the surface coating in the surface coating (S180) of the metal panel preparation step (S100), but must be limited to the same kind. There is no need to do it.

The thermoplastic assembly to be applied by the present invention is installed on land, and the surface of the both surfaces of the bolted coating panel is coated with a surface layer exposed to the outside or the surface of the thermoplastic plastic resin to be surface-coated in the sealing step, the same or different types of thermoplastic plastics Resin powder can be used.

However, thermoplastic resins of different types can be surface coated or surface coated with a plastic spray coating, but they must have the same melting temperature range so that they can be easily melted and combined even if they are different. It is good to achieve a sealing step of surface coating or spray coating.

For example, the surface coating in the metal panel preparation step (S100) with a thermoplastic resin resin powder having a low melting temperature as in 1 to 4, and the sealing step with the thermoplastic resin resin of 7 to 15 having a higher melting temperature. When the spray coating of (S300) is performed, the coating layer of the thermoplastic resin resin powder of 1 to 4 having a low melting temperature first surface-coated by heat of a high melting temperature through a plastic spray coating machine is carbonized or damaged due to overheating This is because the phenomenon occurs.

When the metal tank bolted to the metal panel is used for a long time, deformation may occur in the bolt assembly site and the surrounding bolt assembly structure of the metal panel due to the difference in pressure applied to the bolt assembly site.

In addition, a gap may occur due to the deformation of the metal panel in the bolt assembly due to the temperature change of the contents of the metal tank of the bolt-assembled structure, or the climate and the temperature change. It is desirable to spray-coated with a wider or wider range of 30 mm or more from the outer diameter of the bolt and nut or washer, 50 mm or more on both sides around the seam line, or 10 times or more of the total thickness of the metal panels overlapping each other. .

On the other hand, before spray coating the surroundings of the seams or seams that are connected to the surface-coated bolted coating panels (210, 410) used in the installation of the bolt-assembled structure with a plastic spray coater before the gas stove or electric hot air or plastic spray Preheating by applying heat to the coater.

In the above-described embodiments of the present invention, the bolt prefabricated coating panel having a flat plate or a circular plate shape to form a bolt prefabricated structure has been described. Or bolted steel structures such as pipes or H beams or I beams, etc.

Steel pier structures made of bolted structures or building structures made of concrete materials, such as foundations, walls, columns, decks, roofs, or bolted structures such as concrete tanks or concrete formwork or concrete detachable formwork for filling concrete,

In the case of configuring the bolt-assembled concrete structure or concrete integrated formwork or concrete formwork or detachable formwork with the bolt-assembled wood panel panel, it is possible to achieve the purpose for preventing leakage, corrosion and bolt loosening by applying the present invention.

In addition, as another embodiment of the present invention can be applied to the case of connecting the wood plate panel, metal panel or glass fiber-reinforced plastic panels surface-coated with a thermoplastic plastic resin with a metal screw bolt without assembling the bolt when connecting to each other.

Even when a specific structure is formed by metal screw bolts, the sealing technology of the present invention does not necessarily assemble the wooden panel panels coated with a thermoplastic resin, but the metal screw bolts are drilled or drilled to assemble the structure. Can be.

Alternatively, when lining with a wooden panel coated with a thermoplastic resin coated on a concrete wall or concrete floor, or configured as a concrete formwork or a concrete formwork, the surface of the metal binder of the present invention may be sealed by the method of sealing the present invention. .

In addition, the preheated wood panel or metal bonding material is padded or faced to abut, and then fixed by pressing with a metal screw bolt or a drill.

Spray the thermoplastic resin powder selected on the surface and surrounding area fixed by tight metal screw bolt to the plastic spray coating, and melt the coated thermoplastic resin powder by the flame or heat of the plastic spray coating machine. It also applies to the sealing method.

Therefore, by applying heat through a gas torch or a plastic spray coating machine without using a gasket, the thermoplastic resin is melted and gelled, and the two coating layers are melt-bonded and sealed by spray coating the thermoplastic resin thereon. It claims to fall within the category of.

The present invention aligns the wood panel panel 510 surface-coated with thermoplastic resin powder on the wood panel on which the bolt holes are formed in a butt manner, and combines the bolts 501 with the

pads

520, 530 on the butt portion. The washer 502 and the cap nut 503 or the nut 506 and the butterfly nut 505 can be fastened and assembled, and can be assembled directly by using a metal screw bolt 504 to fix or fasten. Of course, the

pad substrates

520 and 530 are surface coated with a thermoplastic resin powder on a metal panel on which bolt holes are formed.

Surface-coated wooden board panels 510 are made up, down, left, and right adjacent to each other to be in close contact with each other, and then the

pads

520 and 530, which are metal binders coated with a thermoplastic resin, are coated with a gas torch or hot air or plastic. Preheated with a thermal spray coating, and pre-heated gelled surface panel boards 510 and the padding substrate 520 (530) as a metal bonding bolt assembly.

That is, in the case of assembling using the padding board, the padding board and the padding board to which the padding board is in contact with each other are preheated to be attached to each other in a gelled state and then assembled by bolts. Accordingly, the abutment portion of the padding board and the wooden board panel is the surface coating layer is melted with each other and merged into a single coating layer.

Then, after assembling using a bolt and a butterfly nut washer or a screw, and the like, the surface coating layer and the thermal spray coating layer is melted by the thermal spray coating on the boundary portion of the pad and the bolt and the assembly portion to be combined into a single coating layer to complete the sealing.

Example

After forming a total of 15 bolt holes 411 in the longitudinal direction at intervals of 40 mm for 12 mm bolt holes in a length of 160 mm, a length of 200 mm, and a thickness of 3.0 mm made of the same carbon steel sheet as ASTM A 36, the width direction of the steel sheet The position of 40mm was bent at 90 ° with a bending machine to prepare two flanged metal panels 410 (S120).

The prepared flange-shaped metal panel 410 was preheated at 200 ° C. for about 15 minutes in an electric oven having a heating temperature of 250 ° C. through a surface pretreatment step (S140), and then hanged on a hanger of a powder coating booth.

Subsequently, each of the two metal panels 410, whose surface temperature is preheated to 180 ° C., is spaced for 5 minutes, and both surfaces of each metal panel are sprayed with a powder coating machine. RAL 5015 of Sky Blue PPA 571 ES (Product Name) of 15% to 20% by weight of methacrylic acid mixed low-density polyethylene 80 ~ 85% by content of the composition through an extruder, the average particle size of 125㎛ through a mill The modified polyethylene powder was repeatedly coated 3 to 4 times as a thermoplastic resin resin powder and powder-coated so as to have a thickness of 250 to 450 µm to perform surface coating of the metal panel (S180). 5 kg of modified polyethylene powder was stored in the powder storage container of the powder coating machine.

Next, the surface-coated metal panel 410 was put into an oven having a melting temperature of 330 ° C. or higher and after heating for 10 minutes at 190 ° C. (S190), and then taken out and cooled at room temperature for 1 hour or more.

The installation of the structure was performed using the metal panel prepared as described above, and four pairs of round head bolts and nuts having a diameter of 8 mm (S200).

Finally, an electric hot air of about 600 ° C. was applied to the bolted parts and the joints of the metal panel of the installed structure through an electric hot air blower, and then methacrylate 20 of Westlakehemical, USA, EMAC + SP1501 (product name). The master batch polyethylene resin made by mixing 30% content of polyethylene resin in the content%, 67% content of linear low density polyethylene resin of UR644 (product name) of Lotte Chemical of Korea, and RAL 5017 (Traffic Blue) pigment and a sunscreen agent 3% by weight of each other, extruded in a plastic extruder to make a pellet resin, and then crushed by a mill again, modified polyethylene resin powder composition of about 20kg in a blue (RAL 5017, Traffic Blue) color with an average particle size of 250㎛ By spray coating 2 ~ 3 times with a plastic spray coating, and then melt-bonding to 750 ~ 1,030㎛ , It is sealed with jaukyi not seamless state of the joint, and to block a fundamental leakage can also be prevented from loosening bolts.

FIG. 11 is a photograph showing a bolt assembly by contacting two separate bolted metal panels surface-coated with polyethylene resin powder, and FIG. 12 is a bolt assembly surface and a peripheral portion of the bolt assembly of FIGS. 8 to 10. 13 is a photograph showing a state in which the surface coating layers of the thermoplastic resin resin coated on the bolt-assembled metal panel bolted to the gelled state by preheating with an electric hot melter are melted and bonded together in one body, FIGS. 13 and 14. By spray coating the modified polyethylene resin powder with the gas-fired plastic spray coating on the bolt assembly part, the surface of the bolt assembly, the peripheral part, and the bolted assembly of the bolted metal panels are seamlessly surface-sealed and sealed. It is a photograph showing a state. As described above, the embodiment of the present invention can be clearly seen from the photographs of FIGS. 11 to 14.

What has been described above is just one preferred embodiment of the method for sealing a bolted metal structure according to the present invention, the present invention is not limited to the above embodiment, the present invention as claimed in the following claims Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made. In addition, within the scope of the basic technical idea of the present invention, many modifications and applications are also possible for those skilled in the art.

Claims

A preparatory step (S100) of preparing and coating a thermoplastic resin powder on a unit member for constituting the bolt assembly structure;

A structure installation step (S200) of installing the structure by bolt-assembling the surface-coated unit members;

The thermally coated thermoplastic resin powder and the thermally sprayed thermoplastic resin powder are melt-bonded by applying heat to the bolt assembly portion of the bolt-assembled structure and the abutting portion of the unit member while heat-bonding, without seam marks. Sealing method of the assembled bolt structure, characterized in that it comprises a sealing step (S300) to seal.
According to claim 1, wherein the unit member surface-coated in the preparation step (S100),

Metal panels processed into unit members to form the structure and formed with bolt holes for bolt assembly, metal panels coated with glass or epoxy or polyester, glass fiber reinforced plastic panels, wood panel panels, metal padding panels for panel joining, Sealing method of the bolt assembly, characterized in that it comprises a metal coupling angle, flange coupling pipe, bolt prefabricated steel, and bolts, nuts.
The method of claim 1, wherein the preparing step (S100)

Manufacturing a curved or flanged panel (S120);

Performing a surface pretreatment such that a surface profile of both surfaces of the manufactured curved or flanged panel is 50 to 100 μm (S140);

Preheating the surface pretreated panel to a predetermined temperature range (S160);

Surface coating both surfaces of the preheated panel with a thermoplastic resin powder (S180) and

Sealing method of prefabricated bolt structure, characterized in that it comprises a post-heating step (S190) performed after the surface coating (S160).
The method of claim 3, wherein the surface coating step (S180),

The thermoplastic resin powder is applied by powder coating with a powder coating machine, or immersed for several seconds in the fluidized bed in which the thermoplastic resin powder is suspended, or by thermal spray coating with a plastic spray coating, the thickness of the surface coating is 100. Sealing method of the bolt-assembled structure, characterized in that ~ 800㎛.
The method of claim 3, wherein the surface coating step (S180),

A method of sealing a bolted structure according to claim 1, wherein the surface of the surface of the glass or powder epoxy or polyester is bolt-assembled, and the surface of the thermoplastic resin resin is coated by a plastic spray coating machine or a powder coating method.
The method of claim 1, wherein the thermoplastic resin powder coated with the surface and the thermoplastic resin powder coated with a thermal spraying,

Modified polyethylene powder, modified polypropylene powder, polyethylene resin powder, modified polypropylene resin powder, polyamide resin powder, polyolefin-polyamide composite plastic resin powder, polyvinylidene fluoride (PVDF) resin powder , Ethylene tetrafluoroethylene (ETFE) resin powder which is a fluororesin, ethylene crotetrafluoroethylene (ECTFE) resin powder which is a fluororesin, fluoroethylene propylene (FEP) resin powder which is a fluororesin, and polyfluoroalkoxy (PFA) which is a fluororesin ) Resin powder, polyphenylene sulfide resin powder, polyether ether ketone resin powder, fluororesin composite thermoplastic resin powder or composite plastic resin powder selected from among Bolted prefabricated metal Method of sealing structures.
The method of claim 1, wherein the sealing step (S300),

Heating and preheating the bolt-assembled surface and the peripheral portion with a gas torch or a hot air blower or a plastic spray coating (S310);

A pressure tight tightening step (S320) of pressing the bolts and nuts assembled with the bolts in a state in which the thermoplastic resin coating layer is gelled by the preheating;

Thermal spray coating of the thermoplastic resin powder on the surface of the bolt assembly and the surrounding area by the plastic spray coating, and the surface coated surface and the thermal spray coating layer are melted together to be combined into one body, and the surface coating is seamlessly coated without seamless marks. Sealing method of the prefabricated metal structure, characterized in that it comprises a step (S330).
According to claim 1, The structure installation step (S200),

Preheating the prefabricated coating panels or prefabricated coating panels and the metal binder with a gas torch, hot air blower, or plastic spray coating, and then assembling the bolts by bringing the preheated prefabricated coating panels and the metal binder into contact with each other. Sealing method of the bolt-assembled metal structure characterized in that.
According to claim 1, The structure installation step (S200),

Preheat the prefabricated coating panels or the prefabricated coating panels and the metal binder with a gas torch or plastic spray coating.The surfaces of the preheated prefabricated coating panels and the metal binder are brought into close contact with each other, and the metal screw bolts are screwed together. Sealing method of the bolt-assembled metal structure, characterized in that for fixing.
The method of claim 1, wherein the surface-coated thermoplastic resin powder and the thermal spray coating thermoplastic resin powder,

The same or different types of thermoplastic resin resin powder, but different types of thermoplastic resin resin powder, the sealing of the bolted metal structure, characterized in that the thermoplastic resin resin powder having a range of the same melting temperature are used. Way.