KR101241682B1 - A cover sheet for ship building - Google Patents

Abstract

PURPOSE: A cover sheet is provided to effectively prevent the corrosion of a floor by steel powder which is generated by a grinding work. CONSTITUTION: A cover sheet comprises a flame-retarding sheet(11) of a transparent synthetic resin film, which is arranged on a steel grating, and a fixing pin(12) which fixes the flame-retarding sheet onto the steel grating. The fixing pin comprises a horizontal part which is arranged on the upper side of the flame-retarding sheet, and legs which penetrate the flame-retarding sheet and have a bent part. The legs penetrate the flame-retarding sheet and are interlocked with the both sides of the steel grating.

Description

Cover Sheet for Ship Structure Drying {A COVER SHEET FOR SHIP BUILDING}

The present invention relates to a cover sheet for protecting the floor of the structure laid in order to protect the floor, in particular the coating film in the construction of structures, including ships.

For example, in order to drill or refine oil on decks or offshore vessels, especially merchant vessels, or to carry out long-term offshore operations for natural gas production at sea, as shown by way of example in FIG. High-level structures such as process topside modules or cabin structures of offshore platforms or floating petroleum production storage facilities (FPSOs) equipped with scaffolding or floorboards are installed on horizontal members that are fixed on struts using H beams. Various facilities are installed on the plates, in which the hulls are built in dry docks and the modules are separately built over months in coastal docks or factories and assembled in the hull. In this specification, the ship structure is found to include a structure such as a marine platform or a floating crude oil production storage and unloading equipment including a vessel.

In addition, such a structure is manufactured by forming a frame with a vertical strut 1 and a horizontal member 2 as shown in FIG. 2 and installing a foot plate or a working plate 3 on the horizontal member 2.

Drying of these structures requires prolonged exposure in moist and salty environments, which requires a perfect coating to prevent corrosion. Accordingly, each part of the ship is temporarily coated with paint to prevent corrosion, and the welding operation is performed by first grinding the surface to remove the coating to clean the welded portion, and then, after the welding operation, to prevent corrosion. Each part of the block is painted by painting.

When the sparks generated during the welding work fall on the floor, the pre-painted paint may be melted to prevent corrosion, and thus the surface of the H beam or the metal panel may be exposed, and in this case, the corrosion may proceed rapidly in the place where the welding sparks fall. As a pretreatment of the welding operation, the powder generated during grinding for removing the coating film may accumulate on the adjacent floor or beam, and the powder may penetrate the coating and proceed to the corrosion of the floor or the beam itself.

In order to prevent this, a protection means for covering the floor is required to protect the coating of the floor from sparks generated during welding or grinding powder generated during grinding for pretreatment of the welding.

Conventionally, if necessary, the flame-retardant tent material is covered on the floor, and welding and grinding are performed. However, even if the end is fixed to the floor with tape, the tent material may not be stably adhered to the floor as a whole and may be folded. There was a problem that could be injured in the broken or folded parts.

 As the working plate, steel gratings 4 as schematically shown in FIG. 3 may be used, which are arranged at regular intervals in which the longitudinal support pieces 6 are arranged at regular intervals inside the rectangular frame 5. It is fixed, the structure is coupled to the plurality of connection support rods 7 in the horizontal direction, the operator can see below. Such steel gratings are generally rectangular but can be made to have various sizes and shapes as needed.

Such steel grating removes the steel grating in the corresponding area during the construction process and repeats the grinding work, the welding work and the coating film for corrosion prevention.

In this repetitive grinding, welding and painting work, the demolition and re-installation of steel grating is very difficult and time consuming due to the weight of steel grating. It could not be confirmed and could not be used.

Therefore, there has been a need for an improved floor sheet that can be easily laid and removed on the floor for repeated grinding and welding and painting of coatings for corrosion prevention of decks or offshore structures of conventional vessels.

SUMMARY OF THE INVENTION An object of the present invention is to efficiently protect a coating of a floor from sparks generated during welding performed in a drying operation of a steel structure such as a marine structure or a ship structure such as a ship or grinding powder generated during a grinding operation. In order to solve the problem on the sheet to provide a floor protective cover sheet when drying the structure made of a flame-retardant synthetic resin material that is not melted against the fire generated during welding work, not penetrated against the corrosion of powder and fixed to the bottom plate.

Another object of the present invention is a fixing pin on the bottom surface of the flame-retardant sheet to be detachably fixed to the horizontal connecting rod of the steel grating, when the structure using the steel grating as a bottom plate of steel structures such as ship structures or offshore structures It is to provide a cover sheet for drying the ship structure provided with.

Another object of the present invention is to protect the coating film of the vertical support member and the horizontal member painted with the anti-corrosion coating film from the dust and sparks generated during the grinding and welding work in the construction process of the steel structure such as ship structures or offshore structures. It is to provide a cover sheet installation method.

In order to achieve the above object, the cover sheet according to the present invention is a cover sheet for structure drying, which is used by laying on the floor during the drying operation of a steel structure including a ship structure, plasticizers 42 to 53, by weight part It is characterized in that it is formed by molding into a sheet-like flame-retardant synthetic resin composition consisting of the ratio of fillers 23 to 35, elastic aids 5 to 13, stabilizers 2 to 9, flame retardants 4 to 13, pigments 1 to 8.

The pigment is selected in color so as to be represented in a different color for each working zone, it is preferred that the surface is integrally formed with a guide to guide the working zone.

It is preferable that the non-slip embossing is formed on the upper surface of the sheet.

The cover sheet for drying the structure according to another embodiment of the present invention is installed on the floor on which steel grating is installed during the drying operation of the steel structure including the ship structure, and the structure from the dust and spark generated during grinding and welding during the drying operation of the structure. In the drying cover sheet, it comprises a plurality of fixing pins detachably coupled to the connecting support rods installed through the support pieces of the steel grating, and a flame-retardant sheet fixed to the upper surface of the fixing pins.

The cover sheet is formed of a transparent synthetic resin film.

The fixing pin is composed of an elastic coupling portion detachably coupled to the connecting support rod of the steel grating, and a plate-shaped support portion integrally formed on the coupling portion and bonded to the bottom surface of the sheet.

The cover sheet installed in the steel grating is a sheet-shaped flame retardant synthetic resin composition consisting of plasticizers 42 to 53, fillers 23 to 35, elastic assistants 5 to 13, stabilizers 2 to 9, and flame retardants 4 to 13 with respect to the synthetic resin 100 by weight. It is preferable to form by molding.

In the method of installing a cover sheet for protecting the coating film of the structure from the dust and sparks generated during grinding and welding work on the steel grating disposed on the bottom of the structure during the drying operation of the steel structure including the ship structure,

Fixing the coupling part of the plurality of fixing pins detachably to the connecting supporting rods of the steel grating, and attaching the bottom surface of the transparent and flame-retardant sheet to the plate-like support unit integrated on the upper side of the coupling part, And arranging the ends partially overlapping and adhering at intervals with an adhesive.

The bottom cover sheet of the flame retardant synthetic resin material according to the present invention safely and efficiently protects the floor from corrosion caused by sparks generated during welding or grinding work performed during the ship construction process, and frequently installs and removes them. It can be carried out simply and efficiently, there is an effect that can perform the drying operation more quickly.

In the present invention, the cover sheet prevents the falling of waste such as crushed powder by grinding even when steel grating is used as the bottom of the ship structure, thereby eliminating the conventional problem of repeating the removal and installation of steel grating. have.

1 is a schematic perspective view illustratively showing a vessel for carrying out work at sea;
Figure 2 is a schematic perspective view showing a state in which the plate member is installed on the shore in the ship structure of Figure 1;
3 and 4 is a state of use of the bottom cover sheet of the flame retardant synthetic resin material according to the present invention installed on the bottom of the ship structure.
5 is a schematic perspective view of a steel grating used as a plate member installed in a frame of a ship structure.
FIG. 6 is a schematic illustration of a vessel structure portion using the steel grating of FIG. 5 as a working scaffold; FIG.
7 is a schematic perspective view of a coversheet for use in the bottom plate of steel grating according to the present invention.
8 is a view for explaining a method for installing a cover sheet when the bottom of the ship structure is steel grating according to the present invention.
Figure 9 is a partial cross-sectional view of the cover sheet coupled to the steel grating laid in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.

In FIG. 1, a floating oil production storage and unloading facility (FPSO) is shown as an example, and various equipment and equipment including a crude oil refinery are installed on a deck, and a crude oil storage tank is installed below the deck. Various facilities installed above the deck, such as the crude oil refinery, is called a topside module in a modular form.

Such a ship structure forms a frame by coupling the horizontal member 2 of the H beam horizontally to the strut 1 of the H beam as shown in FIG. 2, and the bottom member 3 is installed on the horizontal member 2. And to assemble various equipment or equipment on the floor. Since the construction of the ship structure is carried out for a long time in a wet and salty environment in a coastal dock or a factory, a coating film is formed on the support, the H beam, and the floor member to prevent corrosion, and grinding for the required welding work site. Then, the coating film is removed, then welded to form a coating film.

Such grinding, welding, and repainting work is repeatedly performed for each part of the work, and the grinding powder generated during the grinding work is corroded, and the coating formed on the floor is damaged by the spark generated during the welding work, and ultimately, Since corrosion may progress, a flame-retardant cover sheet is required so that the powder during grinding or the spark during welding does not directly fall on the floor.

To this end, as shown in Figure 3 and 4 in accordance with the present invention, by installing a cover sheet formed of a flame-retardant synthetic resin material on the bottom of the ship structure to be dried on the bottom of the ground powder or sparks generated during grinding and welding work The coating is protected by preventing it from falling on the coating.

Flame retardant synthetic resin cover sheet according to the present invention by weight of the plasticizer 42 to 53, filler 23 to 35, elastic aid (NBR) 5 to 13, stabilizer 2 to 9, flame retardant 4 to 13, pigment 0 to 2 It is made by molding into a sheet shape with a flame-retardant synthetic resin composition mixed by weight.

If the plasticizer is less than 42 parts by weight, there is a problem that the flexibility is too low to reduce the adhesion to the floor during laying work, the hardness is increased and the flame retardancy is increased when the filler is increased, but the transparency is less easily and the content is more than 35 There is a problem that is torn. Pigments in the composition of the cover sheet are optionally provided to display in various predetermined colors according to the work zones so that the operator can easily identify the work zones, and the cover sheet shows marks such as arrows when forming The operator can easily identify the direction of work area, improving work efficiency.

The flame retardant synthetic resin floor cover sheet according to the present invention is installed in a different color for each zone where welding or grinding is performed, and then fixed to the floor with a conventional tape. To this end, the cover sheet is molded into a sheet shape by mixing uniformly in the proportion of plasticizer 47, filler 27, stabilizer 4, elastic aid 9, blue pigment 5 with respect to the resin 100 by weight. The flame retardant synthetic resin cover sheet according to the present invention is fixed to the floor with a tape. In addition, it is preferable to form an embossing on the upper surface of the sheet to prevent the worker from slipping.

The flame-retardant synthetic resin floor cover sheet according to the present invention was molded into three specimens with a composition ratio as follows, and the flame-retardant test was carried out in accordance with the criteria of the 2009-31 Flame Retardant Notice of Fire Protection Agency to obtain the following test results.

Composition ratio  Psalm 1  Psalm 2  Psalm 3 Suzy 100 100 100 Plasticizer 33 32 50 Filler 70 70 30 stabilizator 4 4 4 NBR 0 2.5 10 Flame retardant 4 4.5 6 Pigment 2 2 2

      Test result Test Items standard Psalm 1 Psalm 2 Psalm 3 Afterflaming time (s) Within 5 0 0 0 Afterflaming time (s) Within 20 0 0 0 Carbonization length (cm) Within 20 8.3 7.4 7.8 Surface area (cm2) Within 40 29.5 25.8 32.5

From the above test results, all of the specimens of the flame-retardant synthetic resin floor cover sheet according to the present invention satisfactorily met the reference value, and the flame retardant effect was excellent. It showed sufficient protection against damage.

The cover sheet according to the present invention has good flame retardancy and is flexible, but can be relatively stable on the floor as well as the weight is increased compared to the tent material used in the construction of a conventional ship structure, and the adhesion is much better, the conventional tent When the paper is used as a cover sheet, it does not stick to the bottom of the ship structure and slips easily, so that a problem of frequent safety accidents does not occur.

In addition, even if the sparks generated during the welding work falls, the cover sheet of the present invention is deformed by the heat of the falling sparks, but does not melt, even if the sparks fall on the cover sheet does not damage the coating film of the bottom, the grinding powder generated during the grinding work is covered Even if the cover sheet is not corroded, the cover sheet is not damaged and the bottom coating is protected. Consequently, the bottom is protected from corrosion during the drying operation of the ship structure, thereby preventing the occurrence of defects on the ship structure.

In Figures 5 and 6, steel gratings, which are also used as floor plates or scaffolds, as floor plates or scaffolds on horizontal members 9 installed on vertical supports 8 of structures such as ship structures or topside modules ( 4) is used. When the steel grating is used as the floor as described above, the cover sheets described in FIGS. 3 and 4 cannot be used because they are not in close contact with the steel grating. In this case, a separate fixing means for fixing the steel grating is required, and the cover sheet is lowered. It is preferable that it is transparent so that it can be observed.

For this purpose, as shown in FIGS. 7 to 9, the cover sheet 10 is steel grated by the fixing pins 12 which are arranged at regular intervals to the support pieces 6 in the longitudinal direction of the steel grating 4. It is fixedly installed.

The cover sheet 10 is formed of a transparent sheet 11 having a flame retardant and flexible property, and is formed of substantially the same material as the cover sheet described with reference to FIGS. 3 and 4 but does not include a pigment so that the bottom can be seen. The sheet may be made of PVC, urethane, composite film having a flame retardant properties. In addition, the upper surface of the sheet 11 may be embossed to prevent the worker from slipping.

When the fixing pin 12 protrudes from the upper surface of the steel grating, the upper surface of the longitudinal support piece 6 of the steel grating is formed in an uneven form so as not to be separated from the foot when the workers move. It is preferable that the pin 12 is arrange | positioned at the recessed part of the upper surface of the support piece 6. The fixing pin 12 includes a horizontal portion 13 and leg portions 14 extending downward from both side ends thereof, and the leg portions are engaged with both sides of the longitudinal support pieces 6 in the longitudinal direction of the steel grating. The bent portion 15 is bent to form a gap, the interval of the bent portion is formed slightly smaller than the thickness of the support piece (6).

In the method for installing the cover sheet 11 according to the present invention on the steel grating 4 of the ship structure, the operator arranges the cover sheet on the steel grating, and then fixes the fixing pin to the recess on the support 6 in the longitudinal direction. The bent portion 15 of the leg portion 14 is engaged with and fixed to both sides of the longitudinal support piece 6 of the steel grating, as shown in the cross section in FIG.

The cover sheet can be installed in succession two sheets as needed, in which case the parts are overlapped and glued together, but simply overlapping without adhesive at regular intervals, such as when water cleaning or raining together. It is desirable to allow foreign matter and water to be discharged downward through the non-bonded portions of the two cover sheets.

After the ship structure fabrication process is completed, the cover sheet is removed only by removing the fixing pin fixed on the bottom of the cover sheet from the connecting rod of steel grating or pulling the sheet while the fixing pin is fixed. It is easily done by tearing off.

In this way, by fixing the cover sheet to the steel grating of the ship structure, even if the flakes generated during grinding for the welding work and the sparks generated during the welding work fall, the coating film is protected by falling on the cover sheet of flame retardancy. As it does not fall off immediately, it does not interfere with work underneath, and there is an advantage that it is easy to clean the crushed powder, the coating film waste, etc. which fell on the cover sheet.

Along with this, the greatest advantage is that the grinding and welding work is frequently performed during the fabrication of the structure. In this case, the efficiency of manufacturing the ship structure and the topside module is greatly improved since it is not necessary to repeat the removal and reinstallation of the conventional heavy steel grating. .

In the above, the use of the cover sheet of the present invention was described as an example for the construction of a ship structure, but the present invention is not limited thereto. The cover sheet of the present invention is also suitable when the bottom of a structure such as a ship is steel sheet or steel grating. Can be used.

The cover sheet of the present invention is installed on the bottom of the ship's cabin or work room, or the bottom of the floating offshore production storage and unloading equipment to protect the coating of the bottom from the dust generated during grinding or sparks generated during welding work. Corrosion does not occur and can be easily fixed and used, especially when steel grating is used as floor or work scaffold.

4: steel grating 6: support piece
8: vertical support portion 9: horizontal member
11: sheet 12: fixing pin
13: horizontal portion 14: leg portion

Claims (7)

delete delete delete In the cover sheet for ship structure drying from iron powder and sparks generated during grinding and welding work of the steel grating is installed on the floor where the steel grating is installed during the drying operation of the steel structure including the ship structure,
A flame retardant sheet (11) of the transparent synthetic resin film disposed on the steel grating (4), and a fixing pin (12) for fixing the flame retardant sheet on the steel grating; The fixing pin 12 is bent inward so as to have a horizontal portion 13 disposed on the upper surface of the flame-retardant sheet and a gap extending downward from both ends thereof and having a distance smaller than the thickness of the longitudinal support piece 6 of the steel grating. A bent portion 15 is formed and has a leg portion 14 through which the flame retardant sheet penetrates, and the support portion 6 of the steel grating 4 passes through the leg portion 14 through the flame retardant sheet 11. Cover sheet for drying the ship structure, characterized in that the bent portion 15 is engaged with both sides. The uneven portion is formed on the upper surface of the support piece 6 of the steel grating, characterized in that the horizontal portion 13 of the fixing pin 12 is disposed in the uneven portion of the uneven portion. Cover sheet for ship construction. The flame-retardant synthetic resin according to claim 4 or 5, wherein the cover sheet has a ratio of plasticizers 42 to 53, fillers 23 to 35, elastic agents 5 to 13, stabilizers 2 to 9, and flame retardants 4 to 13 with respect to the synthetic resin 100 by weight. A cover sheet for ship structure drying, which is formed by molding into a sheet shape with a composition. 7. The cover sheet for ship structure drying according to claim 6, wherein an anti-slip embossing is formed on the upper surface of the sheet (11).

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