KR102331411B1 - Slab - Google Patents

Abstract

The present invention relates to a slab used in civil engineering and building structures, is made of high toughness concrete, and is formed in a composite structure to minimize the occurrence of cracks and to prevent the development of cracks. Specifically, the plate-shaped support portion 100 is formed of concrete; a coupling part 200 formed under the support part and coupled to the structure; The surface layer portion 300 is formed on the upper portion of the support; consists of a configuration including.

Description

slab {Slab}

The invention relates to a slab used in civil engineering and building structures, made of high toughness concrete, and formed into a composite structure to minimize crack occurrence and to prevent crack growth.

Patent Invention 001 relates to a concrete composition for a pavement-integrated bridge slab, which has a three-component binder composed of three components of cement, fly ash, and fine powder of blast furnace slag, and is formulated to have a design standard strength of 21 to 40 MPa. A high-performance concrete composition for a pavement-integrated bridge slab that does not require bridge pavement is presented.

Patent Invention 002 relates to a concrete slab structure with improved flexural rigidity and a construction method thereof, comprising: a concrete slab layer formed by pouring concrete; And in order to support the deflection of the concrete slab layer, an FRP pipe that is integrated with the concrete slab layer and behaves as one with the concrete slab layer is proposed.

Patent Invention 003 relates to a method for seismic reinforcement of reinforced concrete structures, using cement matrix with improved adhesion and fire resistance to repair, reinforce, and improve seismic reinforcement capacity of reinforced concrete structures such as tunnels, slabs, bridges, walls and columns. In order to improve the load-bearing capacity and fire-resistance that can improve fire resistance by fire, we present a method for repairing and reinforcing tunnels, bridges, pits, and reinforced concrete structures using grid-type fiber mesh and cement matrix as reinforcing materials.

Patent Invention 004 relates to a concrete composition for a precast slab track panel that uses low-viscosity, high-flow cement to secure high fluidity for productivity and quality improvement of secondary precast products, and achieves demolding strength of 35 MPa at 16 hours of age. As "a concrete composition in which binder, coarse aggregate, fine aggregate and water are blended, the binder has a specific surface area of 4,500-5,200 cm2/g, a total alkali content (TA) of 0.6% or less, a diameter of 45 μm or less, and a residual rate of 2.0 wt% or less , a low-viscosity high-flow cement with a SO3 content of 3.5 to 3.7 wt%, blended at 430 to 440 kg per 1 m3, a water-binder ratio of 33 to 34 wt%, and a fine aggregate ratio of 40 to 48 vol%, and a polycarboxylic acid water reducing agent is the binder. By adding 0.8~1.3wt% compared to that, it is suggested that physical properties of over 35 MPa of compressive strength at 16 hours of age and over 45 MPa of compressive strength at 28 days of age are expressed under the curing conditions of 450~500 mm of slump flow and a constant temperature process of atmospheric steam curing for 5 hours. have.

KR 10-0875240 B1 (Registration date December 15, 2008) KR 10-2010-0060385 A (published on June 07, 2010) KR 10-1612800 B1 (registration date 08/04/2016) KR 10-2019-0079421 A (published on July 05, 2019)

The present invention relates to a slab used in civil engineering and building structures, is made of high toughness concrete, and is formed in a composite structure to minimize the occurrence of cracks and to prevent the development of cracks.

The present invention is an invention for a slab, and specifically, a plate-shaped support portion 100 formed of concrete; a coupling part 200 formed under the support part and coupled to the structure; The surface layer portion 300 is formed on the upper portion of the support; consists of a configuration including.

The present invention is an invention for a slab, and in the invention presented above, the coupling part includes a coupling reinforcing bar 220 or stud 210;

The present invention is an invention for a slab, and in the invention presented above, the surface layer portion is formed of asphalt or concrete; includes.

The present invention is an invention for a slab, and in the invention presented above, the high toughness concrete 110 formed of the support part concrete; It includes;

The present invention is an invention for a slab, and in the invention presented above, the support portion is formed in plurality, and individual plates 140 to which each contact surface 130 is bonded to each other; includes.

Since the slab of the present invention uses high toughness concrete, it has the effect of allowing deformation without being damaged with respect to the load acting on the slab.

The slab of the present invention has an effect of relieving the stress concentration of the stud contact portion formed therein.

Since the slab of the present invention is formed as a composite layer, it has the effect of preventing the growth of cracks in the boundary layer.

Since the slab of the present invention has a circular shape of the contact surface, the contact area is increased to improve the bondability, and a plurality of slabs are combined in a zigzag manner.

1 and 2 are a slab installation embodiment of the present invention
3 to 6 is an embodiment of a slab made of an individual cardboard combination of the present invention

Hereinafter, the most preferred embodiment of the present invention will be described in detail in order to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily carry out the present invention.

The numbers cited in the examples below are not limited only to the objects of reference, and may be applied to all examples. Objects exhibiting the same purpose and effect as the configuration presented in the examples correspond to equivalent replacement objects. The higher-level concept presented in the examples includes sub-concept objects that are not described.

[Embodiment 1-1] The present invention is an invention for a slab 10, and specifically, a support part 100 having a plate shape and formed of concrete; a coupling part 200 formed under the support part and coupled to the structure; The surface layer portion 300 is formed on the upper portion of the support; consists of a configuration including.

The present invention relates to a slab used in bridges, roads, and buildings. A slab is a plate structure, and since it receives a load on only one side of the plate, it receives tensile and compressive stresses on the surface and inside. Conventional slabs are made of high brittle cement, which has weak tensile strength. To solve this, a conventional concrete structure is inserted with reinforcing bars. In addition, it is fixed with studs or reinforcing bars to fix it with the girder of the bridge and the beam of the building, which will be described later. The part in contact with the stud or reinforcing bar causes cracks, and the part where tensile stress is applied also causes cracks. These cracks lead to structural failure. The present invention is to solve this problem, and to secure the safety of the structure by preventing and avoiding cracks by using high toughness concrete and composite structures. Specifically, in Example 1-1, the plate-shaped slab made of high-toughness concrete consists of a support part and a coupling part. The slab has a joint portion to be joined with the foundation (girders, beams) at the lower portion, and the upper portion forms the surface layer portion.

[Embodiment 1-2] The present invention is an invention for the slab 10, and in Embodiment 1-1, the base portion 400 located below the coupling portion; The foundation is formed of any one selected from the girder of the bridge, the beam of the building, and the soil.

Embodiment 1-2 of the present invention relates to the foundation on which the slab is seated. In the case of a bridge, the foundation becomes the upper surface of the girder, and in the case of a building, the upper part of the beam corresponds. In the case of soil, it settles on top of the soil.

[Embodiment 1-3] The present invention is an invention for the slab 10. In Embodiment 1-2, the support portion includes: a first support portion 100a positioned only above the girder; It includes a;

[Example 1-4] The present invention is an invention for the slab 10, and in Example 1-2, the support part is adjacent to the first support part, and the third support part 100c is seated on the abutment and the soil part. ); includes.

[Embodiment 1-5] The present invention is an invention for the slab 10, and in Embodiment 1-2, the support part includes a building beam and a fourth support part 100d seated between the beams.

Examples 1-3 to 1-5 of the present invention are aimed at avoiding crack propagation, and are directed to a support formed of a composite material layer. The support part may be formed as a single structure. In addition, the support may be formed by a combination of a plurality of structures. In the case of a plurality of combinations, in the bridge, it includes a first support part mounted only on the upper part of the girder and a second support part positioned at the joint between the girder and the girder. It is also formed as a third support part formed in the abutment and the soil part. In the case of a building structure, it is formed of a building beam and a fourth support positioned between the beams.

The branch used in the bridge of the present invention is divided into a first support part, a second support part, and a third support part, and the reason for the division is that the characteristics of the load action according to each position are different. The first support part receives a bending load from the upper part to the lower part, and the second support part receives a bending load from the lower part to the upper part and receives a shear load in the middle. The third support receives different loads at both ends. Supports subjected to bending loads cause cracks in the tension part, and cracks gradually expand. It is preferable to configure the slab as a composite layer as shown in FIGS. 3 to 6 in order to avoid the cracks expanding laterally. In particular, in the case of the second support portion, the slab portion is curved from the bottom to the top. That is, the crack is generated at the upper portion and extends toward the center of the curved portion. Therefore, it is preferable to form a multi-layer slab having a curved surface as shown in Fig. 6(C). (The direction of the curve should be formed in the opposite direction to the figure. ) In the case of the third support part, one side is supported on the abutment and the other side is supported on the soil layer. A certain amount of deformation occurs in the soil layer, but the alternation does not cause deformation because it is a rigid structure. Accordingly, the load applied to both ends of the third support portion is applied differently. That is, it is preferably formed in the structure of FIG. 6(B).

[Embodiment 2-1] The present invention is an invention for the slab 10, and in Embodiment 1-1, the coupling portion includes a coupling reinforcing bar 220 or stud 210;

[Example 3-1] The present invention is an invention for the slab 10, and in Example 1-1, the surface layer portion is formed of asphalt or concrete; includes.

Examples 2-1 and 3-1 specify structures formed on the upper and lower surfaces of the support. The lower surface of the support is formed with studs to be fixed to the girders or beams, and may be coupled with a coupling reinforcing bar. Also in the case of bridges, the upper surface of the support may be paved with asphalt or concrete. A conventional slab uses studs to be combined with a structure, but various loads are applied to the contact portion in contact with the stud, and it becomes a location of stress concentration due to a sudden change in shape. Therefore, it can be a major origin of cracking. The slab of the present invention has an effect of inhibiting crack generation and propagation by high toughness concrete to be described later.

[Example 4-1] The present invention is an invention for the slab 10, and in Example 1-1, the high toughness concrete 110 formed of the support part concrete; It includes;

[Example 4-2] The present invention is an invention for the slab 10, and in Example 4-1, the fibers 111 arranged regularly or irregularly and accommodated in the high toughness concrete; includes ;

[Example 4-3] The present invention is an invention for the slab 10, and in Example 4-2, the diameter of the fibers includes those formed in a range of 5 μm to 20 μm.

[Example 4-4] The present invention relates to the slab 10, and in Example 4-2, the fiber is formed of any one selected from PE, PP, and PVA.

The fiber inserted into the concrete block uses a polymer material. Preferably, polypropylene (PP), polyethylene (PE), and polyvinyl alcohol (PVA) are used, and even if it is a material not presented above, it exhibits the same purpose, and the material that can predict the effect upon substitution is an equivalent material. Included. The fiber of the present invention is used for the purpose of improving tensile performance, the diameter of the fiber is used in the range of 5 to 20um, and the length of the fiber is formed in the range of 1000 to 2000 times the diameter.

[Example 4-5] The present invention is an invention for the slab 10, and in Example 4-2, the fiber thickness is 0.01 mm to 0.1 mm in diameter, including forming with a uniform thickness. Preferably it forms a diameter of 0.039 mm.

If the fiber thickness is more than 0.06mm, the effect of mixing concrete and microfiber is reduced, and if the fiber thickness is less than 0.1mm, it affects the production of microfibers. Therefore, the fiber thickness 0.01mm to 0.1mm corresponds to a numerical range having a critical meaning and effect.

[Embodiment 4-6] The present invention is an invention for the slab 10, and in Example 4-1, pores 112 arranged regularly or irregularly and accommodated in the high toughness concrete.

[Embodiment 4-7] The present invention relates to the slab 10, and in Embodiment 4-6, the insert 113 inserted into the pore is included.

[Example 4-8] The present invention is an invention for the slab 10, and in Examples 4-7, the insert includes one selected from glass, waste plastic beads, and waste powder.

[Example 4-9] The present invention is an invention for the slab 10, and in Example 4-1, the high toughness concrete is formed of a mixture composition of cement binder, fine aggregate, water, fiber, and admixture; includes ;

[Example 4-10] The present invention is an invention for a slab 10, and in Examples 4-9, the cement binder consists of ordinary Portland cement, blast furnace slag, fly ash, and silica fume; .

[Example 4-11] The present invention is an invention for the slab 10, and in Examples 4-9, the fine aggregate is made of silica sand.

[Example 4-12] The present invention is an invention for the slab 10, and in Examples 4-9, the admixture includes an expanding agent, a shrinkage reducing agent, and/or an antifoaming agent.

The present invention is an invention for a concrete material that improves the disadvantages of concrete and maximizes the advantages to exhibit excellent performance. Cement-based materials are highly brittle and have no toughness. However, the present invention can secure the effect of high toughness by including fibers in the cement-based material. The antifoaming agent is formed in a non-silicone series, and is formed in a liquid form. In addition, the present invention can secure a concrete tensile strength of 3 MPa or more and a tensile strain of 2% or more. In order to implement this, materials and formulations should be optimized, and fibers should be put therein, and the fibers should have uniform dispersibility. Since the material flow characteristics and pore structure of the matrix, which are mixed with the water reducing agent and the antifoaming agent added to the concrete composite material, affect the fiber distribution characteristics, the dispersibility of the fibers can be improved. Accordingly, the fibers form an artificial bond that is artificially combined, and the compression and tensile performance of concrete can be improved at the same time by the artificial bond.

[Example 4-13] The present invention is an invention for the slab 10, and in Examples 4-9, the cement binder comprises 30 to 70 wt% of ordinary Portland cement and 20 to 40 wt% of blast furnace slag, 10 to 20% by weight of fly ash.

[Example 4-14] The present invention is an invention for the slab 10, and in Example 4-9, the mixing ratio of the cement binder and water is 60 to 80 wt% of the binder and 20 to 30 wt% of water includes

[Example 4-15] The present invention is an invention for the slab 10, and in Examples 4-9, the average particle diameter of the fine aggregate includes that of 0.5 mm.

In the present invention, coarse aggregate is not used, which minimizes the transition zone and uses silica sand for the fracture toughness of the matrix and the homogeneous dispersion of fibers, and the average particle diameter is 0.25 to 50 mm. Therefore, it is possible to reduce shrinkage and secure rigidity.

[Example 4-16] The present invention is an invention for the slab 10, and in Examples 4-13, the shrinkage reducing agent includes a high-performance water reducing agent.

The binder uses an expanding agent and a shrinkage reducing agent to form an optimal flow state of fiber dispersion. In particular, as the shrinkage reducing agent, it is preferable to use a high range water reduction agent (HRWRA).

[Example 5-1] The present invention is an invention for the slab 10, and in Example 1-1, the support portion is formed in plurality, and individual plate members 140 to which the respective contact surfaces 130 are bonded to each other. includes ;

[Example 5-2] The present invention is an invention for the slab 10, and in Example 5-1, the contact surface is formed in a horizontal direction.

[Example 5-3] The present invention is an invention for the slab 10, and in Example 5-1, the contact surface is formed in a vertical direction.

[Example 5-4] The present invention is an invention for the slab 10, and in Example 5-1, a plurality of grooves 141 are formed on the contact surface, and the grooves are selected from a circle, an ellipse, and a polygon. formed in any one shape.

[Example 5-5] The present invention relates to the invention of the slab 10, and in Example 5-1, the contact surface is formed of any one selected from a flat surface, a curved surface, and a slope surface.

Examples 5-1 to 5-5 relate to a support part made of a composite structure. Supports subjected to repeated tension and compression may crack due to periodic fatigue load, and have a problem in that cracks develop over time. In order to solve such crack propagation, it is possible to prevent crack propagation by using the high toughness concrete presented above and forming a composite structure at the same time. In the case of a composite structure, one support is made of a plurality of individual plates. The individual plates may be positioned vertically or horizontally. In the case of the vertical position, the upward propagation of the crack can be stopped by the contact part, and in the case of the left and right positions, the lateral growth of the crack can be stopped by the contact part. In addition, the contact surface may form a plurality of grooves to expand the contact surface. The plurality of grooves may have a circular, oval, or polygonal shape in cross-sectional shape. In addition, the contact surface may be formed of any one selected from among the flat, curved and inclined surfaces to improve assembling of the entire support part. The first support portion has a large area. If the area is large, there may be problems in construction and transportation. In order to solve this problem, it is preferable that a plurality of slabs are coupled to each other and assembled. That is, the individual plates are laminated in a plurality of layers, and it is preferable that they are mutually zigzag fastened. Each individual plate forms a contact surface of a wavy pattern or a polygonal pattern as shown in FIGS. 5(b) and 5(c), and bonding properties can be improved by contacting the patterns. A plurality of individual plates forming a layer may be combined to form one slab. Alternatively, it may be formed as a single layer. The plurality of layers preferably have different thicknesses. Individual plates in contact with the foundation (girders) accommodate stud bolts. Therefore, the lower part (lowest layer of the support part) should be thick as shown in Fig. 4(c). On the other hand, in the part that is not coupled with the stud, the lower part (lowest layer of the support part) should be formed as thin as possible as shown in FIG. 4(b). In the case of the second support part, it is preferable that only the lower portions of both end surfaces are coupled with the studs, and the middle part does not form a deformable stud fastening part. This is to allow deformability against bending and shear loads.

10: slab 100: support
110: high toughness concrete 111: fiber
112: pore 113: insert
120: reinforcement reinforcement 130: contact surface
140: individual plate 141: groove
200: coupling portion 210: stud
220: combined reinforcing bar 300: surface layer
400: base

Claims (5)

In the slab (10),
A plate-shaped support portion 100 formed of concrete;
a coupling part 200 formed under the support part and coupled to the structure;
a surface layer portion 300 formed on the support portion;
It is located under the coupling portion, the bridge girder, the foundation portion 400 formed of any one of the beam or soil of the building;
High toughness concrete 110 formed of the support part of the concrete;
Reinforcement reinforcement 120 accommodated inside the support;
pores 112 arranged regularly or irregularly in the high toughness concrete;
an insert 113 inserted into the pore and formed of any one selected from glass, waste plastic beads, and waste powder;
The support portion includes a first support portion (100a) located only in the upper section of the girder;
Including;
The high toughness concrete is formed of a mixture composition of cement binder, fine aggregate, water, fiber, and admixture, wherein the cement binder comprises 30 to 70 wt% of ordinary Portland cement and 20 to 40 wt% of blast furnace slag, 10 to 20 wt% containing fly ash of;
The fine aggregate is made of silica sand, and the average particle diameter is 0.5mm;
The first support part and the second support part are each formed in plurality and disposed adjacent to each other on the upper part of the girder,
The first support portion is formed by laminating a plurality of individual plates 140 to each other through a contact surface 130 to form a plurality of layers, and the second support portion is a plurality of individual plates 140 to the contact surface 130 . What is mutually adhered through to form a plurality of layers laminated up and down;
A plurality of grooves 141 are formed on the contact surface, and the grooves are circular, oval, and polygonal.
being formed in any one shape selected from;
The coupling portion is formed of a coupling reinforcing bar 220 or stud 210;
The individual plates stacked on the lowermost layer of the first support part and the second support part accommodate the studs,
The lowermost individual plate in contact with the girder and accommodating the stud is formed to be thicker than the individual plate of the other layer that does not accommodate the stud;
A slab comprising; the lowermost individual plate material of the second support part is coupled to the lower part of both end surfaces with studs and the studs are not fastened to the middle part.
delete The method according to claim 1,
The surface layer portion is formed of asphalt or concrete; slab comprising.
delete delete

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