KR100397084B1 - Deck plate and method of making it - Google Patents

Abstract

The present invention relates to a bridge deck and a method for manufacturing the same, the present invention comprises a first step of applying a release agent to the inner surface of the lower mold formed with a plurality of protrusions; Placing a fiber mesh on the lower mold to which the release agent is applied, and injecting the resin mixture mortar on the resin mold to impregnate the resin mortar with the fiber mesh; A third step of preforming the fiber mesh impregnated with the resin mixture mortar by pressing with a pressing force of 100 kg through an upper mold; A fourth step of laminating the fiber mesh impregnated with the resin mixture mortar by performing the processes of the second step and the third step at least three times; A fifth step of imparting vibration to the entire lower mold and performing compression molding at a pressing force of 1000 kg after thermal firing at 60 ° C. for at least 30 minutes; A sixth step of curing after compression molding through a high temperature curing method of 200 ° C. or lower; After demolding, the 7th step of curing for 3 days while maintaining the temperature of 25 ℃ ~ 30 ℃ enables the bridge deck to have excellent adhesion to the concrete surface and excellent physical and mechanical strength, weather resistance and chemical resistance. It is.

Description

Bridge deck and its manufacturing method {DECK PLATE AND METHOD OF MAKING IT}

The present invention relates to a bridge deck and a method for manufacturing the same, in particular, a bridge deck consisting of a fiber reinforced resin panel excellent in adhesion state with the concrete surface, excellent physical and mechanical strength, weather resistance and chemical resistance and its manufacture It is about a method.

In general, bridge decks use concrete deck-plates regardless of the girder's structural type. Mandatory, most of the construction process, such as reinforcing bar assembly process is done by manpower.

Therefore, such concrete bridge deck has a problem that the labor cost increases due to formwork installation and reinforcing steel reinforcement on the site, which is a problem in terms of economic burden, and also the product completion of the site-cast concrete bridge deck Dominated by quality control, there was a problem that the quality depends on the skill and construction management of the workers at the time of construction.

Recently, in order to solve the problem of the cast-in-place concrete deck, a study on the steel deck-plate (steel deck-plate), etc. in progress in this case, since the bottom plate is used as a formwork, the reinforcement amount of the cast iron is reduced, Quality control in the field has the advantage.

However, in the case of the bottom plate using the iron plate, the corrosion of the iron plate in use condition is concerned, and the corrosion prevention work for this should be performed additionally, the advantages in the excellent maintenance of the conventional concrete floor plate is reduced.

In addition, in the case of the bridge bottom plate using the iron plate is a problem that the fatigue failure of the iron plate due to the repeated load has been applied to the actual bridge structure extremely limited.

In other words, the bottom plate using the iron plate is badly bonded to the concrete surface, and due to the force to be separated, the force to be separated and the specific gravity of the iron itself (7.85G) rather it acts as a load on the structure absolutely adversely affects the structure.

In addition, the bottom plate using iron with high thermal conductivity is often separated from the concrete structure due to the expansion and contraction caused by the rapid temperature change in the summer and winter seasons in Korea, so it has a disadvantage in that it cannot play its role as a structure. It also affects corrosion resistance.

In addition, when water cracks in the upper concrete, rapid corrosion occurs on the bottom plate. Also, in steel structures such as steel box bridges and plate girder bridges, welded joints, joints and bolted joints, etc. There were problems such as causing severe corrosion resulting in excessive loss of strength.

The present invention is to solve the conventional problems as described above, the bridge bottom plate made of a fiber-reinforced resin panel excellent in adhesion state with the concrete surface, excellent physical and mechanical strength, weather resistance and chemical resistance, and manufacturing the same The purpose is to provide a way to.

In order to achieve the above object, the present invention includes a first step of applying a release agent to the inner surface of the lower mold formed with a plurality of protrusions; Placing a fiber mesh on the lower mold to which the release agent is applied, and injecting the resin mixture mortar on the resin mold to impregnate the resin mortar with the fiber mesh; A third step of preforming the fiber mesh impregnated with the resin mixture mortar by pressing with a pressing force of 100 kg through an upper mold; A fourth step of laminating at least three layers of the fiber mesh impregnated with the resin mixture mortar by performing the processes of the second step and the third step at least three times; A fifth step of imparting vibration to the entire lower mold and performing compression molding at a pressing force of 1000 kg after thermal firing at 60 ° C. for at least 30 minutes; A sixth step of curing after compression molding through a high temperature curing method of 200 ° C. or lower; It is characterized by providing a method for manufacturing a bridge deck comprising a seventh step of curing for three days while maintaining a temperature of 25 ℃ to 30 ℃ after demolding.

The resin mixed mortar is made of a resin (33% by weight), cement or pigment (0.5% by weight), silica (66.4% by weight), fiber reinforced fiber (0.1% by weight), the reinforcing fiber material It is characterized in that the fiber of any one selected from glass fibers, carbon fibers, aramid and Kevlar fibers.

In addition, the present invention for achieving the above object, the fiber mesh impregnated with the resin mixture mortar is composed of a plate-like body laminated at least three layers, the plurality of protrusions formed on the upper surface of the plate-like body with a predetermined interval It is characterized by providing a bridge deck.

1a to 1f is a process diagram showing the manufacturing process of the bridge deck according to the invention.

Figure 2a and Figure 2b is a cross-sectional view and a perspective view showing a bridge bottom plate manufactured through Preparation Example 1 of the method for manufacturing a bridge bottom plate according to the present invention.

Figure 3 is a schematic diagram showing the upper and lower molds used in Preparation Example 2 of the method for manufacturing a bridge deck according to the present invention.

Figures 4a and 4b is a cross-sectional view and a perspective view showing a bridge bottom plate manufactured by Preparation Example 2 of the method for manufacturing a bridge bottom plate according to the present invention.

Figures 5a and 5b is a cross-sectional view and a perspective view showing a bridge bottom plate manufactured by Preparation Example 3 of the method for manufacturing a bridge bottom plate according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1,7: lower mold 2: protrusion (of lower mold)

3: release material 4: fiber mesh

5: resin mixing mortar 6,9: upper mold

8: Inlet part (lower mold) 10, 20, 30: Bridge deck

11,21,31: protrusion (of bridge deck)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1F are cross-sectional views illustrating a manufacturing process of a bridge deck according to the present invention, and FIG. 2 is a perspective view showing a first embodiment of a bridge deck according to the present invention.

First, the manufacturing process of the bridge bottom plate according to the present invention, as shown in Figure 1a, after producing a plurality of lower molds (1) formed with a plurality of protrusions at a predetermined interval on the inner surface, and then the lower mold The first step of evenly applying the release agent (3) to the inner surface of (1).

As shown in FIG. 1B, the fiber mesh 4 is placed on the lower mold 1 to which the release agent 3 is applied, and the resin mixture mortar 5 is put thereon to mix the resin in the fiber mesh 5. A second step of impregnation of mortar 5 is carried out.

The resin mixture mortar 5 described above is made of resin (33% by weight), cement or pigment (0.5% by weight), silica (66.4% by weight), and reinforcing fiber material (0.1% by weight) in the fiber fiber state. As the reinforcing fiber material, any one selected from glass fiber, carbon fiber, aramid, and Kevlar fiber is used.

The fiber mesh 4 is composed of any one selected from a high tensile one-way fiber, a plurality of layers of bidirectional fibers, and four-way (quadriaxal) fibers, or a combination of these fibers.

Then, a third step of preforming the fiber mesh 4 impregnated with the resin mixture mortar 5 using a pressing force of 100 kg is performed using the upper mold 6 as illustrated in FIG. 1C.

Then, on the fiber mesh 4 impregnated with the resin mixture mortar 5 preformed through the third step process, the steps of the second step and the third step are performed at least two times, as shown in FIG. 1D. A fourth step of laminating the fiber mesh 5 impregnated with the resin mixture mortar 5 into at least three layers is performed.

The process of laminating the fiber mesh 4 impregnated with the resin mixture mortar 5 is repeatedly performed until the required design specification is reached. In the case of lamination, there is a problem in that the strength is increased but a lot of manufacturing costs are required.

After performing the above-described fourth step, vibration is applied to the lower mold 1 using a general vibrator, and thermally fired for at least 30 minutes at 60 ° C., and then the upper mold 6 is shown in FIG. 1E. Through the fifth step of the final compression molding to a pressing force of 1000kg through.

Then, the final compression molded article is cured through a high temperature curing method of 200 ° C. or less, and then a sixth step of demolding from the lower mold 1 using air is performed as shown in FIG. 1F, followed by a temperature of 25 ° C. By performing the seventh step of curing for three days while maintaining the ~ 30 ℃, to produce a bridge deck according to the present invention.

The lower mold 1 and the upper mold 6 are then put into the manufacture of the bridge bottom plate after removing the foreign matter.

<Production Example 1>

The lower mold is produced horizontally (1,800 mm), vertically (2,500 mm), and the height of the protrusion (100 mm), and a release material is applied to the inner surface of the lower mold. The fiber mesh was placed on the release material, and the reinforcing fiber material (0.1 weight) of resin (33 weight%), cement or pigment (0.5 weight%), silica (66.4 weight%) and fiber chopped state was placed on the fiber mesh. %) Was mixed with the resin mixed mortar and impregnated in the fiber mesh, and then pressurized with a pressure of 100 kg through an upper mold having a protrusion to be joined with the lower mold, and attached to the inner surface of the lower mold on which the plurality of protrusions were formed. Preform as much as possible.

The above process was carried out at least two times to laminate three or more layers of the fiber mesh impregnated with the resin mixture mortar, and then give vibration to the entire lower mold using a general vibrator, and thermally calcined at 60 ° C. for at least 30 minutes. After that, by pressing the pressing force of 1000kg through the upper mold to form the bridge bottom plate.

The cured bridge bottom plate is cured through a high temperature curing method of 200 ° C. or lower, and then demolded, and the demolded bridge bottom plate is cured for 3 days while maintaining a temperature of 25 ° C. to 30 ° C. in FIGS. 2A and 2B. As shown, a bridge deck 10 having a width (1,800 mm) x length (2,500 mm) x protrusion 11 height (100 mm) x thickness (10 mm) is manufactured.

The mechanical properties of the bridge deck obtained through the manufacturing process were tested, and the results are shown in Table 1 below.

Mechanical Characteristics of Bridge Deck Mechanical properties Test result Remarks Compressive strength (kg / ㎠) 800-1,300 Ultimate strain 0.017 Direct tensile strength (kg / ㎠) 340-2,700 Ultimate strain 0.01 Flexural strength (kg / ㎠) 400-1,000 Modulus of elasticity Compression (kg / ㎠) 74,000-240,000 Linear limit criteria Tensile (kg / ㎠) 34,000-160,000 Ultimate strain Poisson's Ratio Compression 0.34 Seal 0.22 Fracture Strain Compression 0.02 0.017-0.037 Seal 0.01 0.010-0.014 Coefficient of thermal expansion 6.5 × 10 ^-6 Weather resistance Underwater Curing Little effect. Outside exposure 〃 Chemical resistance Resistant to acids and alkalies.

As can be seen from Table 1, the bridge deck according to the present invention has been found to have a high tensile strength and excellent durability compared to the conventional iron bridge deck. In addition, the weather resistance test showed little effect from weather conditions and underwater survival period, and had strong resistance to acid and alkali. Therefore, it has been found to have excellent applicability to structures exposed to seawater, sewage, calcium chloride and exhaust gas.

<Production Example 2>

As shown in FIG. 3, the lower mold 7 is formed in a shape in which a plurality of inlets 8 having a width (1,500 mm), a length (2,000 mm), and a depth of 10 mm are formed at predetermined intervals. The release material is applied to the inner surface. Then, the fiber mesh is placed on the plurality of inlets 8 coated with the release material, and resin (33 wt%), cement or pigment (0.5 wt%), silica (66.4 wt%), and fiber chop (chop) are placed on the fiber mesh. The process of repeatedly impregnating the fiber mesh by applying a resin mixed mortar obtained by mixing a reinforcing fiber material (0.1 wt%) in a) state is filled in the plurality of inlets 8.

Then, in the state in which the inlet 8 is filled, the fiber mesh is placed thereon, the above-described resin mixed mortar is applied on the fiber mesh and impregnated in the fiber mesh, and then the fiber mesh impregnated with the resin mixed mortar is plate-shaped. The process of pressurizing at 100 kg of pressing force through the upper mold 9 is performed at least two times to laminate three or more layers of the fiber mesh impregnated with the resin mixture mortar.

Then, vibration is applied to the entire lower mold by using a general vibrator, and thermally calcined under infrared light at 60 ° C. for at least 30 minutes, and then compressed to a pressure of 1000 kg through the upper mold to form a bridge bottom plate.

The cured bridge bottom plate was cured by a high temperature curing method of 200 ° C. or lower, and then demolded and cured for 3 days while maintaining the temperature of 25 ° C. to 30 ° C. in FIGS. 4A and 4B. As shown, a bridge bottom plate 20 having a width (1,500 mm) x height (2,000 mm) x protrusion 21 height (10 mm) x thickness (10 mm) is manufactured.

The mechanical properties of the bridge deck obtained through the manufacturing process were tested, and the results are shown in Table 1 above.

<Production Example 3>

A lower mold having a width (1,800 mm) x length (2,500 mm) x protrusion height (100 mm) is prepared, and a release material is applied to the inner surface of the lower mold.

The fiber mesh was placed on the release material, and the reinforcing fiber material (0.1 weight) of resin (33 weight%), cement or pigment (0.5 weight%), silica (66.4 weight%), and fiber chopped state was placed on the fiber mesh. %) Was mixed and the resin mixed mortar was applied and impregnated into the fiber mesh. Then, the fiber mesh impregnated with the resin mixture mortar is pressurized with a pressing force of 100 kg through the upper mold and attached to the inner surface of the lower mold on which the plurality of protrusions are formed.

Then, the above process is carried out at least two times to laminate three or more layers of the fiber mesh impregnated with the resin mixture mortar, and then give vibration to the entire lower mold by using a general vibrator, and thermally fire at least 30 minutes under an infrared ray 60 ° C. After that, the bridge bottom plate is formed by compressing it with a pressing force of 1000 kg through the upper mold.

The cured bridge bottom plate is cured by a high temperature curing method of 200 ° C. or less, and then demolded, and the demolded bridge bottom plate is cured for 3 days while maintaining a temperature of 25 ° C. to 30 ° C. in FIGS. 5A and 5B. As shown, a bridge bottom plate 30 having a width (1,800 mm) x length (2,500 mm) x protrusion 31 height (100 mm) x thickness (10 mm) is manufactured.

The mechanical properties of the bridge deck obtained through the manufacturing process were tested, and the results are shown in Table 1 above.

As described above, the bridge bottom plate according to the present invention manufactured in various standards can be manufactured in various colors as desired, thereby providing a beautiful appearance as compared with the conventional bridge bottom plate made of iron.

And when explaining the construction process of the bridge deck according to the invention prepared as described above, first, as a pre-treatment process of the structure surface, in the case of steel girders to roughen the surface (sanding) to increase the adhesion, then the rust inhibitor and the adhesive material In the case of concrete girder, remove foreign substances and latencies on the surface with a grinder or wire brush and then apply adhesive.

In the case of steel girder, stud bolt is used, and in case of concrete girder, anchor bolt or chemical anchor is used to fix the bridge bottom plate, and then the end of the bridge bottom plate is sealed using epoxy sealing agent. Seal it.

Then, 30 minutes before the concrete is poured, an adhesive is applied to the inner upper surface of the bridge deck, and the silica is sprayed with high purity so that the adhesive state of the slab with the cast concrete is firmly made.

As described above, according to the present invention, it is possible to obtain a bridge deck having excellent adhesion to the concrete surface and excellent physical and mechanical strength, weather resistance and chemical resistance. Therefore, it is possible to reduce the future maintenance cost by improving the life of the bridge structure employing it, and it is possible to shorten the construction period by easy construction.

Claims (7)

A first step of applying a release agent to an inner surface of a lower mold having a plurality of protrusions; The fiber mesh was placed on the lower mold to which the release agent was applied, and on it, resin (33 wt%), cement or pigment (0.5 wt%), silica (66.4 wt%), and fiber stiffened fiber material (0.1 wt%). %), And the reinforcing fiber material is a second step of impregnating the resin mortar in the fiber mesh by injecting a resin mixed mortar which is any one of the fibers selected from glass fibers, carbon fibers, aramid and Kevlar fibers; A third step of preforming the fiber mesh impregnated with the resin mixture mortar by pressing with a pressing force of 100 kg through an upper mold; A fourth step of laminating at least two or more layers of the fiber mesh impregnated with the resin mixture mortar by performing the processes of the second and third steps at least two times; A fifth step of imparting vibration to the entire lower mold and performing compression molding at a pressing force of 1000 kg after thermal firing at 60 ° C. for at least 30 minutes; A sixth step of curing after compression molding through a high temperature curing method of 200 ° C. or lower; A method for manufacturing a bridge deck comprising a seventh step of curing for three days while maintaining a temperature of 25 ℃ to 30 ℃ after demolding. delete The method of claim 1, The fiber mesh is a method of manufacturing a bridge deck, characterized in that the fiber made of any one selected from high-tensile one-way fibers, a plurality of layers of bidirectional fibers, four-way fibers or a combination thereof. Resin (33% by weight), cement or pigment (0.5% by weight), silica (66.4% by weight), fiber chopped reinforcing fiber (0.1% by weight), and the reinforcing fiber is glass fiber, carbon fiber, Fiber mesh impregnated with resin mixed mortar, which is any one selected from aramid and kevlar fibers, is composed of a plate-shaped body in which at least three layers are laminated, and a plurality of protrusions are formed on the plate-shaped upper surface at a predetermined interval. Characterized by bridge bottom plate. delete The method of claim 4, wherein The plurality of protrusions, the bridge bottom plate, characterized in that formed by the method of bending the plate-shaped body by pressing the upper and lower body. The method according to claim 4 or 6, The plurality of protrusions are formed by stacking a fiber mesh impregnated with a resin mixture mortar on the upper surface of the plate-shaped body at a predetermined interval.