KR102008876B1 - Manufacturing mehtod of precast concrete structure integrated with synthetic resins - Google Patents

Abstract

The present invention relates to a method for manufacturing a synthetic resin sheet layer integrated precast concrete structure. Method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention comprises the steps of installing a flat plate-shaped first mold, the synthetic resin sheet layer laminated on the first mold the non-woven fabric Disposing a layer upwardly, disposing a second mold on both ends of the synthetic resin sheet layer, placing a precast concrete compound on the synthetic resin sheet layer, and precasting the synthetic resin sheet layer. Steam curing the concrete compound at a steam curing temperature of 60 ℃ ~ 70 ℃, curing time 6h ~ 10h, and demolding strength of 150kgf / cm ² or more, demolding the synthetic resin sheet layer-integrated precast concrete structure, the First and second grains of the first mold and the second mold that are separated and in which fastening means are screwed in positions corresponding to each other. The formed hole, characterized in that the fixing means comprises a step at which the synthetic resin sheet according to the tensile layer is fastened by tightening load to the first and second fastening holes formed in both end portions of the synthetic resin sheet layers.

Description

MANUFACTURING MEHTOD OF PRECAST CONCRETE STRUCTURE INTEGRATED WITH SYNTHETIC RESINS}

The present invention relates to a synthetic resin sheet layer-integrated precast concrete structure and a method of manufacturing the same, and more specifically, the synthetic resin sheet layer and the concrete layer by steam curing through a non-woven fabric layer having a porosity of 30 to 70%, smooth, durable The present invention relates to a synthetic resin sheet layer-integrated precast concrete structure and a method of manufacturing the same, which provides a precast concrete structure having improved water resistance, aesthetics, and antibacterial properties.

In general, the surface of various civil engineering and building structures including water tanks, reservoirs, water purification plants, salt fields, chemical plants, waste treatment plants, gas stations, car washes, tunnels, etc. are coated with synthetic resin sheet layers to improve the exterior of the structures or to ensure durability. Is carried out.

In the method of covering the concrete structure with the conventional synthetic resin sheet layer, the adhesive is applied to enable the adhesion of the adhesive structure to the base surface of the concrete structure according to the characteristics of the synthetic resin sheet layer, self-adhesive synthetic resin There is a method of using a sheet layer, or a welding method of heating and attaching a synthetic resin sheet layer with a burner or a torch.

The method of attaching the synthetic resin sheet layer using an adhesive requires that the synthetic resin sheet layer has good elasticity, but in this case, it is not only easy to attach, but it also takes a lot of time and money. Particularly, the synthetic resin sheet layers are easily lifted from the overlapping joints, and there is a high concern, and foreign matters such as water stains on the overlapping joints have occurred.

In addition, the method using the self-adhesive synthetic resin sheet layer, by providing the self-adhesiveness on the back of the sheet layer, there was a problem that the self-adhesive synthetic resin sheet layer falls because the adhesiveness during the winter or low temperature is lowered.

In addition, the welding method for heating and attaching the sheet with a burner or a torch is difficult to expect even adhesion and there is a concern that the material may be changed by heat.

In addition, it is not easy to manufacture a synthetic resin sheet layer that satisfies all the conditions, such as when the adhesive resistance is low in the synthetic resin sheet layer having a strong chemical resistance against ultraviolet rays, acidic or basic, if the adhesiveness is good, the chemical resistance is poor, In order to improve durability and workability at the time of application, a hybrid composite synthetic resin sheet layer manufactured by combining several layers of synthetic resin sheets or by mixing various materials has been proposed, but the manufacturing method is not only easy but also very expensive. There is a problem.

Recently, in order to solve this problem, a method of integrally producing a synthetic resin sheet layer in the production of precast concrete structures has been proposed.

However, in this method, the synthetic resin sheet layer and the precast concrete compound are made of different materials, and in the case of the precast concrete structure, since the expansion and contraction is repeated according to the change of the season, the adhesion strength is not complied with the behavior of the precast concrete. There is a problem that the synthetic sheet is broken due to fall or shortly.

In addition, the adhesive strength of the synthetic resin sheet layer is reduced due to the lattices generated on the upper surface of the concrete when it is cast, or the synthetic resin layer is torn or crushed due to external force generated during the casting or heat generated during curing of the precast concrete. , When the steel formwork and the sheet is dropped or the concrete is placed when the sheet surface swells up there is a problem that is not even.

In order to solve this problem, the material of the synthetic resin sheet layer was made of a curable material and formed a corrugated protrusion or an anchored protrusion. However, the manufacture of the synthetic resin sheet layer having such a structure not only increases the cost, but also UV, acidic or basic chemicals. It has a weak property with respect to, there is a problem that the movement and storage is not easy, and the corrugated protrusion or the anchoring protrusion is damaged during the movement and storage.

 In addition, how to combine with the mold of the structure, there is a difficulty in separating from the mold when demolding after steam curing after concrete pouring.

The present invention has been made to solve this problem, the object of the present invention is to expand the adhesion of the synthetic resin sheet layer and the concrete layer, smooth, durable, waterproof, aesthetics, and antibacterial to remove bubbles or latencies It is to provide a method of manufacturing a synthetic resin sheet layer integrated precast concrete structure that provides an improved precast concrete structure.

In addition, the object of the present invention is that the synthetic resin sheet layer is not torn or pushed or damaged by external force or heat during concrete pouring or curing, has good compliance with climate change, and has chemical resistance against ultraviolet rays or other chemicals, It is also to provide a method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure that can be easily bonded between the joints, and can provide a predetermined functionality with good bonding and sustainability even without a composite sheet.

Method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention comprises the steps of installing a flat plate-shaped first mold, the synthetic resin sheet layer laminated on the first mold the non-woven fabric Disposing a layer upwardly, disposing a second mold on both ends of the synthetic resin sheet layer, placing a precast concrete compound on the synthetic resin sheet layer, and precasting the synthetic resin sheet layer. Steam curing the concrete compound at a steam curing temperature of 60 ℃ ~ 70 ℃, curing time 6h ~ 10h, and demolding strength of 150kgf / cm ² or more, demolding the synthetic resin sheet layer-integrated precast concrete structure, the First and second grains of the first mold and the second mold that are separated and in which fastening means are screwed in positions corresponding to each other. The formed hole, characterized in that the fixing means comprises a step at which the synthetic resin sheet according to the tensile layer is fastened by tightening load to the first and second fastening holes formed in both end portions of the synthetic resin sheet layers.

And checking the slump value of the precast concrete compound.

The slump value may be 3 to 18 cm.

The precast concrete blend may have a maximum dimension of coarse aggregate of 25 mm.

The nominal strength of the precast concrete formulation may be at least 30 MPa.

The amount of air in the precast concrete formulation may be (2.0 ± 1.0)%.

The upper limit of the ratio of water and binder of the precast concrete formulation may be 45%.

The lower limit of the amount of unit binder of the precast concrete compound may be 430 kg / m ³ .

The residual aggregate ratio of the precast concrete formulation may be 35 to 50%.

The chloride content of the precast concrete compound may have an upper limit of 0.3 kg / m ³ .

According to the method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure according to an embodiment of the present invention, regardless of the type of synthetic resin sheet layer, the adhesive force between the synthetic resin sheet layer and the concrete layer without complex processes such as moisture removal or grounding It can enlarge, remove bubbles or latencies, and improve smoothness, durability, waterproofness, aesthetics, and antibacteriality.

 In addition, according to the manufacturing method of the synthetic resin sheet layer-integrated precast concrete structure according to an embodiment of the present invention, the synthetic resin sheet layer is not torn or pushed or damaged by external force during concrete casting, and is compatible with climate change. It has good chemical resistance against ultraviolet rays, other chemicals, and the like, and also facilitates bonding between joints, and can provide desired functionality at low cost with good adhesion and durability even without a composite sheet.

1 is a perspective view of the concrete layer of the synthetic resin sheet layer-integrated precast concrete structure according to an embodiment of the present invention is attached to face each other.
2 is a cross-sectional view of FIG. 1.
Figure 3 is a cross-sectional view having an enlarged portion of the structure of the synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention.
4 is a cross-sectional view of a synthetic resin sheet layer integrated precast concrete structure according to a modified embodiment of the present invention.
5 is a conceptual view illustrating a method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention.
Figure 6 is a flow chart for explaining a method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention.

Now with reference to Figures 1 to 6 will be described with a synthetic resin sheet layer integrated precast concrete structure and its manufacturing method according to an embodiment of the present invention.

As shown in Figures 1 to 3, synthetic resin sheet layer integrated precast concrete structure 1 according to an embodiment of the present invention, the nonwoven fabric layer 20, the nonwoven fabric layer 20 under the concrete layer 10 ) Synthetic resin sheet layer 30 is disposed below, the concrete layer 10 and the synthetic resin sheet layer 30 can be integrally formed through the nonwoven fabric layer 20, the synthetic resin formed as described above The sheet layer integrated precast concrete structure 1 may be coupled to the concrete layers 10 so that the inner and outer surfaces thereof may include the synthetic resin layer 30.

The nonwoven fabric layer 20 may be firmly bonded to the synthetic resin sheet layer 30 by lamination, the concrete layer 10 is a space between the non-woven fabric layer 20 is a curable fine concrete pool provided when the concrete is poured Filled in (21) is configured to be firmly bonded to the synthetic resin sheet layer (30).

The concrete layer 10, even if the synthetic resin sheet layer 30 has a function such as chemical resistance, durability, antimicrobial, even if the adhesion is not made by the adhesive, regardless of the component between the nonwoven fabric layer 20 The mechanical bonding to the synthetic resin sheet layer 30 may be maintained through the curable fine concrete 11 and the nonwoven fabric layer 20 steam-cured in the space 21.

Therefore, in order to increase the adhesion strength of the synthetic resin sheet layer 30 and the concrete layer 10, it is not necessary to configure the synthetic resin sheet layer 30 as a composite sheet having chemical resistance, durability, and adhesive strength.

In addition, even if the nonwoven fabric layer 20 is made of a single material having the chemical resistance, durability, and antimicrobial properties of the synthetic resin sheet layer 30 can absorb the external force generated when the concrete layer 10 is placed, It is not necessary to increase the hardness while forcibly thickening the thickness of the synthetic resin sheet layer 30 or giving up the stretching ratio.

The synthetic resin sheet layer-integrated precast concrete structure 1 according to the embodiment of the present invention formed as described above has at least one surface coated with the synthetic resin sheet layer 30 to prevent the concrete layer 10 from corroding from the external environment. It can provide a beautiful exterior.

The concrete layer 10 is, in general, high-strength concrete is used for use in water tanks, reservoirs, water purification plants, salt farms, chemical plants, waste treatment plants, gas stations, car washes, tunnels, etc., the precast concrete compound is the maximum of coarse aggregate the dimensions are 25mm, nominal strength is at least 30MPa, air content (2.0 ± 1.0)%, is not more than 45% of the upper limit value of the water and binder ratio, the lower limit value of the unit combination's discretion and 430kg / m ^3, glass goljaeyul is 35 to It is 50% and it is preferable that chloride content is 0.3 kg / m <^3> or less.

In addition, in order to couple the concrete layer 10 to the synthetic resin sheet layer 30 via the nonwoven fabric layer 20, the hardened cement paste (hardenable fine concrete; 11) mixed with fine aggregates in the concrete compound is It should be able to flow into the curable fine concrete receiving portion 21 between the nonwoven layer 20.

In general, the fine paste-like material, that is, the hardenable cement paste, which appears on the surface of the concrete layer 10 as the moisture increases in the process of curing the concrete has no curing power due to the impurity of the cement powder or the paste in the aggregate. Adhesion strength may drop.

Therefore, by forming the curable cement paste 11 to fill the curable fine concrete receiving portion 21 of the nonwoven fabric layer 20, the adhesion strength between the concrete layer 10 and the synthetic resin sheet layer 30 The slump test for the concrete compound should be performed in order to make the adhesion strength with the synthetic resin sheet layer 30 more than 20kgf / cm ² for the concrete structure required by the Ministry of Environment.

The slump test indicates the kneading of the concrete, which shows the degree of difficulty of the work and the degree of resistance to material separation depending on the kneading.

In general, if the slump value is large, the flow of concrete is good because the dough is thick, but if it is too large, material separation is large and water and cement paste flows out between the molds, causing voids and excessive bleeding to the voids and surfaces inside the concrete. The generation of latencies can impair concrete quality.

Experimental Example 1

The slump test has a unit volume mass of 2400 kg / m ³ , air volume (2.0 ± 1.0)%, unit binder mass of 442kg / m ² , coarse aggregates containing 25mm crushed stone, and the aggregate aggregate content is 39.0%. Figure Calculate the slump value by varying the water binder ratio to 30%, 35%, 40%, 45%, 50% with 0.3kg / m ³ or less, and the concrete compound according to the slump value is 5mm thick polyester The adhesive strength to the synthetic resin sheet layer 30 was tested 20 times or more by steam curing through the nonwoven fabric layer 20 made of a heat-sealed nonwoven fabric.

Water binder rain 30% 35% 40% 45% Slump value 5 cm 9 cm 15 cm 18 cm Adhesion strength 30kgf Of cm ² 25kgf Of cm ² 20kgf Of cm ² 15kgf Of cm ² Workability usually usually good good Material separation none none none Occur

As can be seen in Table 1, when the slump value of the concrete compound is about 3 to 18 cm, preferably 15 cm or less, material separation does not occur and workability is good, while the nonwoven fabric layer 20 It was found that the adhesion strength to the synthetic resin sheet layer 30 is greater than 20 kgf / cm ² , which is the adhesive strength of the synthetic resin sheet layer 30 to the concrete structure required by the Ministry of Environment.

The nonwoven fabric layer 20 is manufactured by a dry nonwoven fabric laminated with a felt, carding technique, air array method, and electrostatic method by smelting wool or the like, a meltblown nonwoven fabric made of polypropylene microfiber, and a spunlace process. Spunlace nonwoven fabric with soft touch and excellent drape, spunbonded nonwoven fabric made by spinning the chemical fiber, wet nonwoven fabric combining fiber laminated web with adhesive agent, polyolefin, At least one of a heat-sealed nonwoven fabric in which polyester and nylon-based thermoplastic fibers are melted and bonded to each other may be used.

Experimental Example 2

However, as shown in Table 2, the unit volume mass is 2400kg / m ³ , the air content (2.0 ± 1.0)%, unit binder mass 442kg / m ² , coarse aggregate contains 25mm crushed stone, the aggregate aggregate ratio is 39.0%, The amount of chloride contained in concrete is 0.3 kg / m ³ or less, so that the slump value is about 15 cm, and the curable fine concrete accommodating part 21 of the nonwoven fabric layer 20 made of a polyester heat-sealed nonwoven fabric having a thickness of 5 mm. When the adhesion strength between the concrete layer 10 and the synthetic resin sheet layer 30 was tested by varying the ratio, that is, the porosity, the ratio of the curable fine concrete accommodating portion 21 was 30% or less. Since the curable fine concrete 11 cannot penetrate into the curable fine concrete receiving portion 21 to provide sufficient bonding strength between the synthetic resin sheet layer 30 and the concrete layer 10 and the synthetic resin sheet layer ( 30) Lee was able to observe that.

In addition, even when the ratio of the curable fine concrete accommodating portion 21 is 70% or more, since the nonwoven fabric layer 20 may not sufficiently play a role of mediating the synthetic resin sheet layer 30 and the concrete layer 10. It was observed that the concrete layer 10 and the synthetic resin sheet layer 30 is peeled off.

Here, the porosity was attached to the water by the thickness of the nonwoven fabric layer 20, the volume of the water filled in the curable fine concrete receiving portion 21 was measured by the volume of water to the volume of the nonwoven fabric layer.

First, Table 2 shows the results of experiments on the adhesion strength between the concrete layer 10 and the synthetic resin sheet layer 30 by varying the porosity of the nonwoven fabric layer 10 made of a polyester heat-sealed nonwoven fabric having a thickness of 5 mm.

Porosity of Nonwoven Layer of 5mm Thickness Polyester Thermal Fusion Nonwoven Fabric 10% 20% 30% 40% 50% 60% 70% 80% Adhesion strength 5kgf / cm ² 10kgf / cm ² 20kgf / cm ² 30kgf / cm ² 25kgf / cm ² 20kgf / cm ² 15kgf / cm ² 10kgf / cm ²

In addition, Table 3 shows the results of experiments on the adhesion strength between the concrete layer 10 and the synthetic resin sheet layer 30 by varying the type of nonwoven fabric at 40% porosity.

Type of nonwoven Meltblown Nonwovens Spunlace Nonwovens Spunbond Nonwovens Heat Fusion Nonwoven Fabric burglar About 30kgf / cm ² About 31kgf / cm ² About 28kgf / cm ² About 25kgf / cm ²

As shown in Table 3, the type of nonwoven fabric does not matter much, and the nonwoven fabric layer 20, which serves as a medium while sufficiently securing the curable microconcrete accommodating portion 21 into which the curable fine concrete 11 may be injected, is provided. It can be seen that securing enough is an important factor.

In addition, the thickness of the non-woven fabric layer 30 of the synthetic resin sheet layer 30 so that the curable fine concrete receiving portion 21 can support the curable fine concrete 11 thickness of the synthetic resin sheet layer 30 It is preferable that it is about the thickness.

The synthetic resin sheet layer 30 containing 30 to 70% of the filler has a tensile strength of at least 60 kgf / cm ² before bonding to the concrete layer 10, and at least 60 after bonding to the concrete layer 10. It has a tensile strength of kgf / cm ² or more and an elongation of 500% or more to absorb the impact caused by the compound during concrete casting to prevent tearing or digging, and has elasticity to the seasonal behavior of the concrete layer (10) It is desirable to provide ductility so that it is compliant and can be transported in roll form.

In addition, it is preferable that the thickness is within about 5 mm in order to sufficiently form the curable fine concrete accommodating portion 21, to provide durability, flexibility, and sufficient tensile strength, and to consider costs and the like.

The synthetic resin sheet layer 30 may be roughly divided into synthetic rubber and synthetic resin. Synthetic rubber materials include chloroprene rubber, polyisophthalene rubber, butyl rubber, and the like, and synthetic resin materials include vinyl chloride and polyethylene. Synthetic rubber system is easy to install because it has high elongation capacity and excellent workability, but it is easy to be deteriorated by ozone. Synthetic resin system is easy to install because of low price and relatively strong elongation capacity, but there is concern about plastic deformation due to heat or external force. There is.

The synthetic resin sheet layer 30 may also be made of chloroprene rubber having weather resistance, durability, chemical resistance, uniform flexibility, and the like, since the minimum thickness should be 0.16 cm or more, the price of the synthetic resin sheet 30 is not used because it is very expensive. According to one embodiment of the present invention, even when using the synthetic resin sheet layer 30 of the minimum thickness, the nonwoven fabric layer 20 can absorb the external force during the casting of the concrete layer 10, one sheet of synthetic resin sheet ( Even if 30) is used, the thickness can be reduced.

Since the synthetic resin sheet layer 30 is made of polyisobutylene rubber, it does not suffer from deterioration of the self-wire due to ozone, which is a disadvantage of the rubber system, and may be well adhered with a solvent-type adhesive such as benzene or gasoline at the adhesive joint. .

In addition, the synthetic resin sheet layer 30 may be made of butyl rubber to improve strength, elasticity, flexibility, and the like, and mix ethylene propylene terpolymer (EPP) rubber to overcome the disadvantages of being easily deteriorated by ozone or ultraviolet rays. This can also improve weather resistance.

The synthetic resin sheet layer 30 may use polyethylene or vinyl chloride which is very inert chemically. In this case, although the weather resistance is excellent, but the adhesion is poor, the curable fine concrete 11 that has penetrated the curable fine concrete receiving portion 21 of the nonwoven fabric layer 20 without the need for various special processing to increase the adhesion By using it may be to have an adhesive strength integral with the concrete layer (10).

All of the synthetic resin sheet layer 30 is at least a product is standardized so that it can be transported and stored in the form of a roll regardless of its properties, so that the thickness is uniform, the finish is beautiful, and the nonwoven fabric layer 20 is not required for various special processing. It is possible to provide a predetermined adhesion strength to the concrete layer 10 through the medium, and can exhibit elasticity in compliance with the behavior of the concrete layer 10 even after the attachment.

Now with reference to Figure 4 will be described a synthetic resin sheet layer integrated precast concrete structure according to a modified embodiment of the present invention.

4 is a cross-sectional view of a synthetic resin sheet layer integrated precast concrete structure according to a modified embodiment of the present invention.

On the other hand, as shown in Figure 4, the synthetic resin sheet layer 30 is a leg portion 40 protruding beyond the height direction of the nonwoven fabric layer 20 along the edge of the synthetic resin sheet layer-integrated precast concrete structure (1) You can have more).

The leg part 40 may be made of a polymer synthetic resin material to improve the adhesion between the synthetic resin sheet layer 30 and the concrete layer 10.

In addition, the leg portion 40 may be used as an index member when combining the synthetic resin sheet layer-integrated precast concrete structure (1) in the width direction, may protect the inner concrete layer (10), the transport during the movement The edges of the synthetic resin sheet layer-integrated precast concrete structure 1 may be prevented from colliding with each other.

The length of the leg part 40 may be longer than the thickness of the curable fine concrete layer 11 and smaller than the thickness of the concrete layer 10.

The leg portion 40 may be rounded along an edge of the synthetic resin sheet layer 30, or may be of an angular plate type.

Now, with reference to Figures 5 and 6, it will be described in detail a method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure according to an embodiment of the present invention.

5 is a conceptual diagram illustrating a method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention, Figure 6 is a method of manufacturing a synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention The flowchart described.

As shown in Figure 5 and 6, the manufacturing method of the synthetic resin sheet layer integrated precast concrete structure according to an embodiment of the present invention, first blending the precast concrete compound for the synthetic resin sheet layer integrated precast concrete structure The slump value is checked (S110).

As described above, the precast concrete blend is required to attach the synthetic resin sheet layer to the base surface of the concrete layer of the environmental notice between the concrete layer 10 and the synthetic resin sheet layer 30 with a ceramic adhesive or the like. In order to provide more than the strength of the adhesive strength to check whether the slump value is about 15cm (S120), the first mold 110 of the flat plate corresponding to the base substrate is first installed (S130).

The synthetic resin sheet layer 30 on which the nonwoven fabric layer 20 is laminated on the first mold 110 is disposed such that the nonwoven fabric layer 20 is exposed upward (S140).

As such, placing the synthetic resin sheet layer 30 on which the nonwoven fabric layer 20 is laminated so that the nonwoven fabric layer 20 is exposed upward, and then pouring the precast concrete compound forms the precast concrete layer 10. In order to prevent the occurrence of a latency, that is, an uncured layer in the upper direction, and to allow the curable fine concrete layer 11 to be impregnated by the weight of the curable fine concrete accommodating portion 21 between the nonwoven fabric layer 20. to be.

A second mold 130 detachable from the first mold 110 is disposed at both ends of the synthetic resin sheet layer 30, and the first mold 110 is disposed so that the synthetic resin sheet layer 30 does not flow during concrete pouring. The first coupling hole 111 formed in the) and the second coupling hole 131 formed in the second mold 130 are disposed to correspond to each other, and the first coupling hole 111 is fastened by using the fixing means 150 (S150).

The first coupling hole 111 and the second coupling hole 131 are formed with a first thread 111a and a second thread 131a, respectively, to form the precast concrete compound on the synthetic resin sheet layer 30. The synthetic resin sheet layer 30 may be provided by providing a tightening force to prevent the synthetic sheet layer 30 from being loosened by crying or wrinkles due to external force generated during pouring or heat generated during curing of the precast concrete compound. Tension in the outward direction (S160).

The precast concrete compound is poured in the state in which the synthetic resin sheet layer 30 is uniformly stretched by the first fastening (S170).

Therefore, the synthetic resin sheet layer 30 in which the synthetic resin sheet is denatured by heat or moisture generated by a precast concrete compound cured in a humidifying environment for supplying steam or water can be prevented.

When the casting of the precast concrete compounding is completed (S180), steam curing at 60 ℃ ~ 70 ℃, curing time 6h ~ 10h steam curing temperature is preferable because the demoulding strength can be more than 150kgf / cm ² or more. .

When the steam curing is completed, stripping a precast concrete structure in the demolding strength of 150kgf / cm ² or more (S190).

 The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Configurations shown in the embodiments and drawings described herein are only one of the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

10: precast concrete layer 11: curable fine concrete layer
20: nonwoven fabric layer 21: curable fine concrete receiving portion
30: synthetic resin layer 40: leg portion

Claims (10)

Installing the first flat mold;
Disposing a synthetic resin sheet layer on which the nonwoven layer is laminated on the first mold to expose the nonwoven layer upward;
Disposing a second mold on both ends of the synthetic resin sheet layer;
Pouring the precast concrete blend onto the synthetic sheet layer;
Steam curing the precast concrete blend on the synthetic resin sheet layer at a curing temperature of 60 ° C. to 70 ° C. and a curing time of 6 h to 10 h;
Demolding strength of 150kgf / cm ² or more, comprising: demolding the synthetic resin sheet layer-integrated precast concrete structure,
The first mold and the second mold are separated and formed with first and second coupling holes for screwing the fixing means in positions corresponding to each other, and the first and second fixing holes formed at both ends of the synthetic resin sheet layer. Method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure comprising the step of tensioning the synthetic resin sheet layer is tightened with respect to the second fastening hole. The method of claim 1,
Method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure comprising the step of inspecting the slump value of the precast concrete compound. The method of claim 2,
The slump value is 3 to 18cm synthetic resin sheet layer integrated precast concrete structure manufacturing method. The method of claim 1,
The precast concrete blend is a method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure having a maximum size of the coarse aggregate 25mm. The method of claim 1,
And the nominal strength of the precast concrete compound is at least 30 MPa. The method of claim 1,
The air content of the precast concrete compound is (2.0 ± 1.0)% synthetic resin sheet layer integrated precast concrete structure manufacturing method. The method of claim 1,
The upper limit of the ratio of the water and the binder of the precast concrete compound is 45% synthetic resin sheet layer manufacturing method of the precast concrete structure. The method of claim 1,
The lower limit of the amount of unit binder of the precast concrete compound is 430 kg / m ^{3 The} method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure. The method of claim 1,
Residual aggregate ratio of the precast concrete formulation is 35 ~ 50% synthetic resin sheet layer integrated precast concrete structure manufacturing method. The method of claim 1,
The chloride content of the precast concrete compound is the upper limit of 0.3kg / m ^{3 The} method of manufacturing a synthetic resin sheet layer-integrated precast concrete structure.

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