KR102119005B1 - Concrete slab and method for manufacturing concrete slab - Google Patents

Abstract

The present invention relates to a method for manufacturing a concrete slab and a concrete slab, and a method for manufacturing a concrete slab and a concrete slab that can increase the structure safety by converting the crack propagation direction at the contact surface between the insert and the crack generated in the outside of the slab. It is an invention.
Specifically, it is a uniform cross-sectional plate shape, and is made of a main structure including an outer body 200 formed of concrete; and an insert 100 inserted inside the outer body.

Description

Concrete slab and method for manufacturing concrete slab}

The present invention is an invention for a concrete slab and a method for manufacturing a concrete slab, which accommodates the insert inside the slab, and the insert controls the crack propagation direction to secure the structural safety of the slab.

Patent invention 001 is a slab; At least one rib protruding from the lower portion of the slab to support a load; It is provided on both sides of the slab to present a technique for a concrete slab assembly including a partition beam that prevents concrete from entering between the ribs under the slab when pouring concrete.

Patent invention 002 is a member embedded in the concrete for the construction of a lightweight concrete member, characterized in that the hollow section 110 of a circular cross section is formed in the center of the three-dimensional body and the edges are treated as curved surfaces to have a donut-shaped outer sheath as a whole. Presents a technique for a donut-shaped hollow forming body 100.

Patent invention 003 is a lower concrete layer formed by pouring concrete so that the lower end of the longitudinal and transverse transfer connecting material is formed by fixing a plurality of tensile steel wires are tensioned, and both sides form a mountain and valley in the longitudinal direction; A plurality of styrofoam seated at regular intervals on the upper surface of the lower concrete layer; An upper concrete layer on the lower concrete layer and the upper surface of the styrofoam so as to form a partition between the styrofoam by pouring concrete so that the upper ends of the longitudinal and transverse transfer connecting materials protrude; A transverse shear connecting member installed at the upper concrete layer and the partition wall to be perpendicular to the longitudinal shear connecting member, and installed at the upper concrete layer; It has been proposed a technique for a precast concrete hollow slab, characterized in that the styrofoam is provided with an injury preventing portion to prevent it from being injured by the side pressure of the poured concrete.

Patent invention 004 is a pillar (10); A girder 20 constructed to connect between the pillars 10; A small beam 30 that is perpendicular to the girder 20 and is arranged to cross between the girders 20; A slab upper and lower main root 41b that is parallel to the small beam 30 by dancing corresponding to the small beam 30 between the girder 20 and the small beam 30; The small beam (30) and the slab upper back muscle (42) that is reinforced across the slab upper plinth (41b); The small beam 30, the slab upper and lower major muscles (41b), slab concrete (45) is poured into the slab upper back muscle (42); is composed, including, but, the slab upper back muscle (42) is the main root It presents the characteristics of an embedded beam reinforced composite slab system characterized by being structurally designed.

KR 10-0812132 B1 (Registration date March 4, 2008) KR 10-2011-0043943 A (Public date April 28, 2011) KR 10-1166897 B1 (Registration date July 12, 2012) KR 10-2017-0116622 A (Registration date October 20, 2017)

The present invention is an invention for a concrete slab and a method for manufacturing a concrete slab, which accommodates the insert inside the slab, and the insert controls the crack propagation direction to secure the structural safety of the slab.

In order to solve the problems of the conventional invention, the present invention is an invention for a concrete slab, a uniform cross-section plate shape, and the outer body 200 formed of concrete; and the insert 100 inserted inside the outer body; Includes.

The concrete slab of the present invention includes the above-described invention, wherein the insert is formed along the length of the outer body, and the width of the insert and the outer body is the same.

The concrete slab of the present invention includes the above-mentioned invention, in which the insert is formed in a uniform or non-uniform shape.

The concrete slab of the present invention includes the above-mentioned invention, wherein the insert is formed in a curve in the longitudinal direction.

The concrete slab of the present invention is the invention presented above, the insert length (l) is 75% of the outer body length (L), and the insert height (h) is 10 to 20% of the outer body height (H). It is formed of.

The present invention is an invention for a method of manufacturing a concrete slab, a first concrete input step (S100) of pouring concrete into an insert formwork; and, after the first concrete input step, a first curing step of curing the concrete of the insert formwork (S200); After the first curing step, a first demolding step of removing the insert formwork (S300); After the first demolding step, the inserting step of inserting the insert into the slab formwork (S400);, the After the inserting step, the slab forming step (S500) for curing while putting concrete into the slab formwork.

In the present invention, it is possible to obtain an effect of increasing the safety of the structure by converting the crack propagation direction at the contact surface with the crack generated in the slab outer body. The concrete slab of the present invention has an effect of maintaining safety without being destroyed even if the amount of deformation increases. The concrete slab of the present invention has an effect of improving the elastic recovery property of the entire slab. The concrete slab of the present invention reduces the deformation, which has the effect of reducing the occurrence of cracks.

1 is a conceptual diagram of a civil structure to which the slab of the present invention is applied.
Figure 2 is a slab and insert layout of the present invention.
Figure 3 is a slab shape according to the number of inserts and the shape change in the various inserts in the present invention.
Figure 4 is a slab shape according to the number of inserts and the shape change in various inserts in the present invention.
5 is a slab shape according to the shape change of one surface of the insert in the present invention.
Figure 6 is a slab shape of the curved insert in the present invention.
7 is a conceptual diagram of a plurality of inserts formed in the longitudinal direction of the slab in the present invention.
8 is a flow chart for a slab manufacturing method in the present invention.

Hereinafter, the most preferred embodiments of the present invention will be described in detail in order to describe in detail that a person skilled in the art to which the present invention pertains can easily implement the present invention.

[Example 1-1] The present invention is an invention for a concrete slab, and includes a uniform cross-section plate-shaped outer body 200 formed of concrete; and an insert 100 inserted inside the outer body.

The present invention is an invention for a concrete slab. Specifically, the plate-shaped slab forms an outer body forming an outer shape, and accommodates an insert inside the outer body. The insert is first made of concrete, and then the insert is inserted inside the outer mold, and the outer body is poured with concrete to form a composite structure. This can obtain the effect of increasing the safety of the structure by converting the crack propagation direction in the contact surface with the crack generated in the external body.

As an application example of a slab, Fig. 1 shows a conceptual diagram of a connecting slab. The connecting slab is installed on the ground at the interface between the girder 22 and the ground, to prevent partial settlement of the ground. One side of the connecting slab spans the alternation 21, one side of the connecting slab is supported by a backfill, and the other side of the connecting slab forms a pavement surface.

[Example 1-2] In the concrete slab example 1-1 of the present invention, fibers 300 accommodated in the outer body and/or the insert body and formed in a uniform thickness and length are included.

Concrete material has high brittleness. Therefore, concrete structures easily generate cracks. The slab of the present invention is made of concrete, and cracks can be easily generated by repeated loads. To solve this problem, concrete materials that can exert the effect of increasing toughness and reducing brittleness must be applied to the slab. The slab of the present invention contains a large amount of microfiber inside the concrete. Microfibers increase the ductility of the slab. Therefore, even if the amount of deformation increases, the slab is not destroyed and the safety can be maintained.

[Example 1-3] In the concrete slab Example 1-2 of the present invention, the fibers include those formed of a polymer material or steel fibers.

[Example 1-4] In the concrete slab Examples 1-3 of the present invention, the polymer comprises one selected from PE, PP, and PVA, and the steel fiber is steel, iron, copper, aluminum, stainless , Tungsten, and the like.

The microfiber inserted into the concrete block uses a polymer material. Preferably, polypropylene (PP), polyethylene (PE), and polyvinyl alcohol (PVA) are used, and even the material not previously presented exerts the same purpose, and the material capable of predicting the effect upon substitution is an equivalent material. Is included.

[Example 1-5] In the concrete slab Example 1-2 of the present invention, the polymer fiber thickness is 0.01 mm to 0.1 mm in diameter, and includes forming a uniform thickness. Preferably, a diameter of 0.039 mm is formed. The thickness of the steel fiber is formed from 0.01mm to 1mm.

[Example 1-6] In the concrete slab Example 1-2 of the present invention, the amount of fibers mixed in the outer body and the insert body is the same or different.

In the microfiber drawing test, if a necking phenomenon occurs in the middle of the microfiber, accurate test results cannot be obtained. Therefore, the microfiber should be formed with a uniform thickness. If the microfiber thickness is 0.06 mm or less, the effect of mixing concrete and microfiber is reduced, and if the microfiber thickness is 0.1 mm or more, the microfiber effect is affected. Therefore, the fiber thickness of 0.01mm to 0.1mm corresponds to a numerical range having a critical meaning and effect.

[Example 1-7] In the concrete slab Example 1-1 of the present invention, it is accommodated inside the outer body, and reinforcement bars 230 formed on both sides of the insert.

[Example 1-8] In the concrete slab example 1-7 of the present invention, the reinforcing bar is located in the longitudinal direction of the slab, and the main reinforcing bars 231 are formed in plurality; connecting the main reinforcing bars and perpendicular to the main reinforcing bar It includes; a reinforcement bar 232 is formed.

In order to increase the rigidity of the outer body, a reinforcing bar is formed inside the concrete, and the reinforcing bar is formed on a symmetrical surface based on the insert. Or it is formed only on one side. In the reinforcing bar, the main reinforcing bars formed in the longitudinal direction are arranged in parallel at uniform or non-uniform intervals, and the reinforcing bars connecting the main reinforcing bars are formed in combination with the main reinforcing bars.

[Example 2-1] In the concrete slab example 1-1 of the present invention, the insert is formed along the longitudinal direction of the outer body, and the width of the insert and the outer body is the same. .

The slab receiving the load from the top generates a U-shaped deformation, and the crack starts from the bottom under the tensile load and is directed upward. In addition, the edge of the slab easily generates cracks, and the width of the insert is formed to be the same as the width of the outer body to change the direction of the crack generated at the edges.

[Example 2-2] In the concrete slab example 2-1 of the present invention, the insert includes one or two or more slab thicknesses and/or longitudinal directions.

The cracks propagated from the bottom are advanced in the upper direction, and the crack direction is changed at the part contacting the insert. When two inserts are accommodated inside the outer body, four contact surfaces are formed, which has the effect of increasing the number of avoidance elements in the direction of cracking to four.

When a plurality of inserts are installed in the longitudinal direction of the slab, each insert may be installed at a predetermined interval or may be installed in contact with each insert. In addition, each insert installed in layers is characterized by being cross-installed.

[Example 2-3] In the concrete slab Example 2-2 of the present invention, the insert includes a curve formed along the length of the outer body.

Generally, the crack propagation direction is generated from the bottom to the top, but when the insert is curved, it exerts an effect of lowering the crack propagation direction from the boundary of the contact surface to the bottom. To this end, the insert is preferably formed in a curved shape. In addition, when the insert is formed in a curve, it is possible to improve the elastic recovery of the entire slab.

[Example 2-4] In the concrete slab example 2-1 of the present invention, an adhesive 400 is disposed between the outer body and the insert.

[Example 2-5] In the concrete slab Example 2-4 of the present invention, the adhesive includes an epoxy or an old and new concrete adhesive.

A boundary layer 400 is formed between the outer body and the insert, and the boundary layer serves to switch the crack in the traveling direction. On the other hand, the boundary layer may cause interlayer separation, which may impair the structural safety of the slab. To prevent this, an adhesive is formed on the contact surface. It is preferable to use epoxy as the adhesive, and the adhesive bonding concrete is not limited to the epoxy, and can be replaced with an equivalent object.

[Example 3-1] In the concrete slab Example 1-1 of the present invention, the insert is formed in a uniform or non-uniform shape.

[Example 3-2] In the concrete slab example 3-1 of the present invention, one surface of the insert is parallel to one surface of the outer body, and the other surface of the insert includes a plurality of curved surfaces or a plurality of polygons.

[Example 3-3] In the concrete slab example 3-2 of the present invention, the plurality of curved surfaces include those in which the radius length and arc length are equally arranged in a zigzag manner.

[Example 3-4] In the concrete slab example 3-3 of the present invention, the inserts are formed in plural, and each insert includes those having different radius lengths and/or arc lengths.

[Example 3-5] In the concrete slab Example 3-2 of the present invention, the plurality of polygons include those formed in a tapered shape.

[Example 3-6] In the concrete slab Examples 3-5 of the present invention, a plurality of the inserts are formed, and each taper size includes differently formed ones.

The slab may have different crack propagation directions and sizes depending on the direction of action of the load, the type of load, the size of the load, the support conditions, and the shape conditions of the slab. To accommodate this, the shape of the insert must be variously formed. Therefore, the insert may take a uniform or non-uniform shape based on the overall shape of the slab, and may take a uniform or non-uniform shape based on the shape of the slab itself. As an embodiment, the upper portion of the insert may take a planar shape, and the lower portion may take a curved or polygonal shape. Conversely, the lower portion may take a flat shape, and the upper portion may take a curved or polygonal shape. The curved surface is formed by repeatedly forming a plurality of curved surfaces and forming a zigzag shape in the same or different sizes. In the case of a polygonal shape, shapes such as a rectangle and a taper are repeatedly formed. In the case of a taper shape, the taper size is formed differently depending on the position.

[Example 4-1] In the concrete slab example 1-1 of the present invention, the insert is formed in a curve in the longitudinal direction.

The present invention inserts a curved insert in the longitudinal direction of the slab. The slab under load from the top generates maximum deflection at the center, and in order to reduce the amount of deflection of the slab, the insert serves as a reinforcement inside the slab. The reinforced slab reduces strain, which reduces cracking. In addition, even if cracks occur, the crack propagation direction can be downward.

[Example 4-2] In the concrete slab example 4-1 of the present invention, the insert is formed in plural, and includes the same arc length and arc radius of the curve.

[Example 4-3] In the concrete slab example 4-1 of the present invention, the insert is formed in plural, and the arc length and the arc radius of the curve are sequentially arranged differently.

[Example 4-4] In the concrete slab example 4-1 of the present invention, the inserts are formed in plural, and include the same or different thicknesses of the curves.

[Example 4-5] In the concrete slab example 4-4 of the present invention, the thickness of the curve includes a thicker middle portion than both ends.

[Example 4-6] In the concrete slab examples 4-2 to 4-5 of the present invention, the center points of the arc coincide with one first straight line, and the second straight line extending from the center of the outer body longitudinal direction This includes eccentricity or eccentricity.

When a plurality of inserts are accommodated inside the slab as suggested above, a plurality of contact surfaces are formed, thereby exhibiting an effect of reducing cracks stepwise. It is also preferable to form a plurality of inserts formed in an arc shape. The plurality of inserts may be formed in the same size, or may be formed in different sizes. That is, the thickness of the lower insert may be formed to be larger or smaller than the thickness of the upper insert. In addition, depending on the position of the stack, the arc-shaped insert can be applied differently or equally to the arc length and radius values. The stacked arc-shaped inserts can be installed at the same radius, or differently at the arc center point.

[Example 5-1] In the concrete slab example 1-1 of the present invention, the insert length (l) is 75% of the outer body length (L), and the insert height (h) is the outer body height ( H).

In the present invention, the relationship between the height (h) of the insert and the overall height (H) of the slab can obtain a relational expression of “h=0.1 to 0.2H,” and the length (l) and the length of the slab (L) of the insert The relational expression of “l=0.75L” can be obtained.

[Example 5-2] In the concrete slab example 5-1 of the present invention, the insert is arranged in parallel with the first insert and the second insert, and between the first insert and the second insert The interval length d1 of is 20% of the height of the sledge part H, and the center line c1 and the center line C1 of the interval include the same thing.

In the present invention, the relationship between the gap (d1) and the slab height (H) formed between the two inserts is “d1=0.2H”, the center line (c1) of the gap formed between the two inserts and the center line (C1) of the slab ) Is “C1=c1”.

[Example 5-3] In the concrete slab example 5-1 of the present invention, the inserts of the third to sixth inserts are sequentially arranged in parallel, and the third insert and the fourth insert , The gap length (d2) between the fifth insert and the sixth insert is 10% of the slab height (H), and the center line (c2) and the center of the slab (C1) between the fourth insert and the fifth insert Includes the same.

In the present invention, four inserts are stacked and inserted, and a gap d2 is formed between each insert, and the relationship between the gap d2 and the slab height H is “d2=0.1H”. In addition, the relationship between the centerline (c2) and the slab centerline (C1) between the 4 and 5 inserts is “C1=c2”.

[Example 5-4] In the concrete slab Example 5-1 of the present invention, the insert length (l) is 75% of the outer body length (L), and the insert height (h) is the outer body height (H ) Is formed from 10% to 20%, and the insert is formed into a curve, and the center point (P1) of the curve is located at a center line (CL1) extending from 50% of the length of the outer body.

[Example 5-5] In the concrete slab example 5-1 of the present invention, the center point P1 includes that formed from 200% to 500% of the height of the slab from the center line CP1 of the slab.

The shape relations presented in Examples 5-1 to 5-5 represent optimized shape ratios according to various conditions, which show special effects in load, support conditions, slab size, insert size, and placement relationship.

[Example 6-1] The present invention is an invention for a method for manufacturing a concrete slab, a first concrete input step (S100) of pouring concrete into an insert formwork; and, after the first concrete input step, concrete of the insert formwork The first curing step (S200) to cure; After the first curing step, a first demolding step (S300) to remove the insert formwork; After the first demolding step, insert to insert the insert into the slab formwork It includes; step (S400);, after the inserting step, the slab forming step (S500) for curing while putting concrete into the slab formwork.

[Example 6-2] Method for manufacturing a concrete slab of the present invention In Example 6-1, after the first demolding step, an adhesive coating step (S310) of applying an adhesive to the outer surface of the insert.

[Example 6-3] A method for manufacturing a concrete slab of the present invention In Example 6-1, after the inserting step, a positioning step (S410) for fixing the insert gap by a fixing body.

[Example 6-4] Method for manufacturing a concrete slab of the present invention In Example 6-1, before the first concrete input step and the slab forming step, a fiber input step (S10) of mixing fibers with concrete; do.

The present invention is a method invention for producing a concrete slab. Firstly, an insert is prepared first. The insert is made of slab by pouring concrete into the formwork and curing it using the formwork. The first insert produced is accommodated in the slab process. That is, a slab formwork is manufactured for the production of a slab, and an insert manufactured prior to the inside of the slab formwork is inserted. After the insert is inserted, concrete is poured and cured to accommodate the insert inside the slab. As another embodiment, after applying the adhesive to the outside of the finished insert, the insert can be accommodated in the slab formwork. As another embodiment, it is possible to accurately limit the position of the insert by inserting the fixture inside the slab formwork. In addition, the concrete for producing the insert and the slab can form a concrete by mixing the fibers of a fine size therein.

21: shift
22: Girder
23: backfill
100: insert
200: external body
300: fiber
230: Reinforcing bar
231: Cast iron
232: Back reinforcement
400:adhesive

Claims (5)

In the concrete slab,
Uniform cross-section plate shape, the outer body 200 formed of concrete;,
Insert 100 inserted inside the outer body;,
Adhesive 400 located between the outer body and the insert;,
The insert is formed to be curved in the longitudinal direction;,
The inserts are formed in a plurality of layers to be stacked, and the stacked arc-shaped inserts are provided with different arc center point positions depending on the stacking position;
The insert is to form a different thickness or radius of the arc depending on the position of the stack; concrete slab comprising a.
The method according to claim 1,
The insert is formed along the length of the outer body, the width of the insert and the outer body is formed the same; containing concrete slab.
The method according to claim 1,
The insert is formed in a uniform or non-uniform thickness, concrete slab comprising a.
delete In the method of manufacturing a concrete slab,
A first concrete input step (S100) of pouring concrete into the insert formwork;
After the first concrete input step, the first curing step of curing the concrete of the insert formwork (S200);,
After the first curing step, a first demolding step of removing the insert formwork (S300);,
After the first demolding step, the adhesive coating step of applying an adhesive to the outer surface of the insert (S310);,
After the first demoulding step, the inserting step of inserting the insert into the slab formwork (S400);,
After the inserting step, the slab forming step (S500) to cure while putting concrete into the slab formwork;,
The insert formed in the first demoulding step is formed in a plurality of curves,
The plurality of inserts are installed differently at the center point of the arc according to the stacking position, and forming a different thickness or arc radius value depending on the stacking position of the insert; Concrete slab manufacturing method comprising a.

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