KR101532430B1 - Methods for manufacture and construction of hybrid-type rib slab having increased rib height - Google Patents

Abstract

The composite rib slab according to the present invention can be manufactured by installing a lightweight body on a PC slab and installing a topping concrete on the PC slab. The lightweight body also acts as a mold for forming a site rib, The ribs and the field ribs are integrated with each other to be integrated with each other to resist stress so that the load bearing capacity and the sectional strength can be increased. At the same time, the amount of concrete used can be reduced, and the widthwise connecting portion (PC connecting portion between the PC slabs) dummy ribs are formed to prevent cracks due to the upper load and to relieve stress concentration transferred to the PC slab portion and to prevent breakage of the lightweight body in stacking with multiple layers.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a composite rib slab having an increased rib height,

More particularly, the present invention relates to a method of manufacturing a composite rib slab, and more particularly, to a method of manufacturing a composite rib slab, in which a lightweight body is installed in a PC slab portion and a lightweight body is used to form a field rib, And the ribs of the PC slab portion and the field ribs are integrally combined to resist the stress so that the load bearing capacity and the sectional strength can be increased. At the same time, the amount of concrete used can be reduced, and the widthwise connection portion of the PC slab portion Dummy ribs are formed in the connecting part of the PC to prevent cracks due to the upper load and to relieve the stress concentration transmitted to the PC slab part and to prevent the lightweight body from being laminated or stacked in multiple layers The present invention relates to a method of manufacturing a composite rib slab and a method of constructing the same.

Generally, as a method of constructing a slab, there are a method of constructing a slab by installing a formwork on a site and pouring concrete, a method of constructing a slab by placing concrete in a factory and then transporting the slab to a site (precast concrete slab, PC Slab).

On the other hand, there is a method of completing the slab by placing the topping concrete on the PC slab in the field. There is a method of completing the slab such as a double tee slab, a slab having a plurality of ribs, a reverse rib slab, a hollow core slab, The slab is made by pouring the topping concrete 50mm ~ 200mm into the slab.

When the thickness of the topping concrete is increased, the load bearing capacity and sectional strength are increased, but the self weight and the deflection during construction increase and the usage amount of concrete, reinforcing steel and steel wire is increased.

Further, when the topping concrete is placed on the PC slab, there is a problem that stress is concentrated on the portion where the PC slab is connected (that is, both end portions in the width direction of the PC slab) due to the upper load acting on the top plate in the form of a cantilever.

The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a composite rib slab capable of reducing the amount of concrete used and its weight by installing a lightweight body in a PC slab portion and installing a topping concrete It has its purpose.

It is a further object of the present invention to provide a method and apparatus for increasing the height of a rib by allowing a lightweight body to function as a form for forming a site rib and integrating the ribs and the field ribs of the PC slab portion in a perfect combination to increase the load- And to provide a method of manufacturing and constructing a composite rib slab.

It is a further object of the present invention to provide a dummy rib in a width direction connecting portion (a connecting portion between PC slabs) of a PC slab portion to prevent cracks due to an upper load and alleviate stress concentration transmitted to a PC slab portion The present invention also provides a method of manufacturing and installing a composite rib slab.

It is still another object of the present invention to provide a method of manufacturing a composite rib slab and a method of constructing the composite rib slab, which can prevent the lightweight body from being broken during lamination by a plurality of layers.

Another object of the present invention is to provide a method of manufacturing and constructing a composite rib slab, which can manufacture the PC slab portion while maintaining the existing plant facilities and specifications and thus reduce the production cost of the composite rib slab.

In order to solve the above problems, the present invention provides a composite rib slab comprising: (a) a plurality of first ribs 16 extending downward from a lower surface of a horizontal plate 12 and a horizontal plate 12; Installing a PC slab portion (10) on a construction site; And (b) forming a site topping concrete portion 50 by placing concrete so as to cover the upper surface of the PC slab portion 10 and the lightweight body 30 after the step (a). The first rib 16 is formed on the PC slab portion 10 And the lightweight body 30 is disposed on the upper surface of the horizontal plate 12 along the longitudinal direction.

At the positions corresponding to the first ribs 16, the lightweight bodies 30 are spaced apart from each other, and the concrete is poured into the spaced spaces to form the second ribs 52.

At this time, the central axis C2-C2 of the second rib 52 coincides with the central axis C1-C1 of the first rib 16. As an alternative to the configuration in which the central axes (C1-C1) and (C2-C2) coincide with each other, or when the width s2 of the second ribs 52 is larger than the width of the first ribs 16 (s1).

The first ribs 16 and the second ribs 52 can be integrated together by at least one of the reinforcing bars 14, the wire, the shear connection member, and the shear key to resist stress together.

The light weight bodies 30 provided at both ends in the width direction of the PC slab portion 10 may be formed such that the surfaces facing both ends thereof include the inclined surfaces 33 and 34, The formed concrete forms a dummy rib 54 having a sharp bottom. The dummy rib 54 allows a portion of the upper vertical load VF to be transferred to the first rib 16 through the site topping concrete portion 50. Accordingly, stress concentration due to the cantilever phenomenon at both ends in the width direction of the PC slab portion 10 can be alleviated.

According to the present invention, the filler material 60 can be installed to fill the gap between the neighboring PC slab portions 10.

Meanwhile, the technical idea according to the present invention can also be applied to an inverse rib slab. That is, the production and construction method of the reverse ribbed slab (composite rib slab) includes (a) a PC slab 412 having a plurality of first ribs 416 extending upward from the upper surface of the horizontal plate 412, (410) at a construction site; And (b) forming a site topping concrete part 450 by placing concrete so as to cover the upper surface of the PC slab part 410 and the lightweight body 30 after the step (a).

The first ribs 416 are disposed on the PC slab portion 410 And extend along the longitudinal direction. The light weight body 30 is provided along the longitudinal direction on both sides of the first rib 416 and the upper end of the light weight body 30 is higher than the upper surface of the first rib 416. [ Therefore, the concrete placed in the space between the two lightweight bodies 30 provided on both sides of the first rib 41 forms the second rib 452.

At this time, the central axis C4-C4 of the second rib 452 coincides with the central axis C3-C3 of the first rib 416, or the width s4 of the second rib is equal to the width s3.

The first ribs 416 and the second ribs 452 can be integrated together by at least one of the reinforcing bars 14, the wires, the shear connection members, and the shear keys to resist stress together.

Preferably, a step 417 may be formed on the upper surfaces of both sides of the first rib 416. In this case, the lightweight body 30 is installed so as to span the jaw 417, and a cavity 70 is formed under the lightweight body 30.

According to the present invention, when the PC slab part is manufactured in the factory, the lightweight body can be fixed to the PC slab part by installing the lightweight body (30) on the concrete surface after pouring concrete. As an alternative thereto, the lightweight body may be fixed to the PC slab portion in the field.

According to the present invention, a support member can be installed in the PC slab portion to prevent the lightweight member from being broken at the time of stacking and transporting the PC slab portion. The support member is installed on the upper surface of the PC slab portion. When the composite rib slab is stacked in multiple layers, the support member supports the upper load to prevent breakage of the lightweight body.

The present invention has the following effects.

First, by installing a lightweight sieve on the PC slab and placing the site topping concrete, the amount of concrete used and its weight can be reduced.

Secondly, the light weight can increase the rib height by acting as a form to form the field ribs, and the ribs of the PC slab portion and the field ribs are integrally integrated with each other to resist the stress, thereby increasing the load bearing capacity and sectional strength.

Thirdly, a dummy rib is formed in the widthwise connecting portion (the connecting portion between the PC slabs) of the PC slab portion to prevent the crack due to the upper load and relieve the stress concentration transmitted to the PC slab portion.

Fourth, it is possible to prevent the lightweight member from being broken during lamination with a plurality of layers.

Fifth, the PC slab part can be made by maintaining the existing factory equipment and specifications, thereby reducing the production cost of the composite rib slab. For example, even if the site conditions change, it is possible to cope with the thickness of the site topping concrete part and the lightweight body, so it is not necessary to make a PC slab part of a separate standard, so that the existing factory facilities can be utilized as it is.

In particular, when constructing an underground parking lot, the PC slabs of the roof layer (the roof layer of the underground parking lot) and the PC slabs of the basement layer have to be different from each other in the past, so the cost and time for manufacturing each PC slab However, in the manufacturing and construction method according to the present invention, since the same PC slab portion is used, the height of the topping concrete portion, the amount of the reinforcing bar and the size of the prestress can be adjusted, so that the cost and time required for manufacturing the PC slab portion can be reduced.

1 is a perspective view showing a composite rib slab according to a first embodiment of the present invention;
2 is a sectional view taken along line II-II 'of FIG.
3 is a cross-sectional view of the composite rib slab of Fig.
Figure 4 is a front view showing the composite rib slab of Figure 1 connected to the beam.
Figure 5 is a front view showing the composite ribs slab of Figure 1 connected to another beam;
Figure 6 is a front view showing the composite ribs slab of Figure 1 connected to another beam;
Figure 7 is a front view showing a variant of the composite rib slab of Figure 1 connected to the beam;
Fig. 8 is a front view showing still another modification of the composite rib slab of Fig. 1; Fig.
Fig. 9 is a front view showing still another modification of the composite rib slab of Fig. 1; Fig.
10 is a sectional view showing a composite rib slab according to a second embodiment of the present invention;
11 is a cross-sectional view showing that the composite rib slabs of FIG. 10 are installed to be connected to each other;
12 is a cross-sectional view showing a modified example of the composite rib slab of FIG. 10;
13 is a front view showing a composite rib slab having a support member according to the present invention;
Figure 14 is a side view showing the composite ribs slab of Figure 13 stacked.
15 is a side view showing laminated composite rib slabs with support members according to the present invention;
16 is a cross-sectional view showing a continuous installation of a composite rib slab according to a third embodiment of the present invention;
17 is a front view showing the composite rib slab of FIG. 16 installed in the beam;
Fig. 18 is a front view showing a modified example of the composite rib slab of Fig. 16 installed in the beam; Fig.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely examples of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Hereinafter, the composite rib slab used in the present invention will be described first, and then the fabrication and construction method will be described. On the other hand, the x-axis, the y-axis, and the z-axis described in the drawings are orthogonal to each other as axes used in the Cartesian coordinate system.

FIG. 1 is a perspective view showing a composite rib slab according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II 'of FIG.

Referring to the drawings, a composite rib slab 100 includes a PC slab portion 10, a lightweight body 30 provided on a PC slab portion 10, a PC slab portion 10 and a lightweight body 30, And a site topping concrete portion 50 having a concrete structure.

The PC slab portion 10 is made of precast concrete. As the PC slab portion 10, a conventional double T PC slab may be used. In this case, it is not necessary to provide a separate facility to make the PC slab portion 10, Because it can be used, it can reduce production cost and production time.

The PC slab portion 10 has a horizontal plate 12 and a plurality of first ribs 16.

The horizontal plate 12 is a flat plate-like precast concrete structure having a predetermined length, width, and thickness, and a reinforcing bar or the like may be installed therein to reinforce the strength. A lightweight body (30) is provided on the upper surface of the horizontal board (12).

The plurality of first ribs 16 are formed so as to extend downward from the lower surface of the horizontal plate 12. The first rib 16 is located at a position corresponding to the second rib 52.

The first ribs 16 extend along the longitudinal direction (y direction) of the PC slab portion 10, and the plurality of first ribs 16 are formed at predetermined intervals in the width direction (x direction).

A tuck 17 is formed at both ends of the first rib 16 in the longitudinal direction (y direction). The jaw 17 is the part that spans the beam when connected to the beam, which is further described below.

A tensile steel bar 13 and a reinforcing bar 14 are installed inside the first rib 10. The tensile steel bar 13 is installed mainly in the longitudinal direction (y direction) of the slab at the lower part of the first rib 16 to resist tensile stress and the reinforcing bar 14 is fixed to the first rib 16 and the second rib 52 ). The reinforcing bars 14 protrude above the upper surface of the PC slab portion 10. On the other hand, a shear cotta (not shown in the drawing) may be formed on the upper surface of the horizontal plate 12. The shear keys may be used in place of or in conjunction with the reinforcing bars 14. In addition, wire or shear connectors may be installed. Accordingly, in the present invention, the first and second ribs 16 and 52 can be integrated by at least one of the reinforcing bar 14, the wire, the shear connection member, and the shear key.

In the present invention, the center axis C1-C1 of the first rib 16 and the center axis C2-C2 of the second rib 52 coincide with each other. This is because the center axes C1-C1 and C2- And the central axes C1-C1 (C2-C2) are structurally substantially coincident with each other so that the first and second ribs 16 and 52 can be integrated and behave like one rib. The fact that the central axes C1-C1 and C2-C2 are structurally substantially identical means that both sides of the second rib 52 are asymmetric and the central axis C2-C2 is slightly inclined, But also the case where the ribs 16 and 52 act structurally and integrally.

The first ribs 16 may be formed to have a reduced width from the upper end to the lower end, or may have a constant width.

The width s1 of the first rib 16 and the width s2 of the second rib 52 can be set as an alternative to the configuration in which the central axis C-C1 and the central axis C2- s2 may correspond to each other. This is because the width s1 of the first rib 16 is equal to or substantially equal to the width s2 of the second rib 52 or at least the width of the upper end of the first rib 16 and the width of the lower end of the second rib 52 The first and second ribs 16 and 52 are integrated and act like one rib without excessive stress concentration at the connecting portions of the first and second ribs 16 and 52 because the widths are the same or substantially the same it means.

The lightweight body 30 is provided on the upper surface of the horizontal plate 12 along the longitudinal direction (y direction) and the width direction (x direction). The lightweight body 30 is made of a material having a specific gravity smaller than that of concrete, and preferably made of foamed styrofoam, plastic, recycled lightweight material (recycled lightweight material), and the like.

The inside of the light weight body 30 may be solidly filled (i.e., tightly), but it may have a groove in a portion where the interior of the light weight body 30 is empty or faces the horizontal plate 12. In addition, a grid may be provided in the interior of the lightweight body 30 or appropriate vertical members may be installed so as not to be damaged when there is an impact from the outside at the construction site or when the worker is stepping on the lightweight body 30. The lattice and the vertical members may be made of the same material as that of the lightweight body 30.

The lightweight body 30 may be installed in the PC slab portion 10 at the construction site but when the PC slab portion 10 is manufactured at the factory, the lightweight body 30 is placed on the concrete surface after pouring concrete, It is preferable that the body 30 is fixed (joined) to the PC slab portion 10. This is because the weight of the lightweight body 30 is small, so that the topping concrete may float up when the concrete is laid.

The lightweight bodies 30 are installed at predetermined intervals in the width direction (x direction) of the PC slab portion 10. [ Specifically, at positions corresponding to the first ribs 16, the lightweight bodies 30 are spaced apart from each other by an interval s2 corresponding to the width s1 of the first ribs 16. As an alternative to the above configuration or in combination with the above configuration, the lightweight body 30 is formed so that the central axis C2-C2 of the second rib 52 coincides with the central axis C1-C1 of the first rib 16 And can be installed spaced apart.

Topping concrete is placed in the spaced apart spaces to form a second rib 52 so that the second rib 52 has the same width s2 as the gap. Thus, the lightweight body 30 also serves as a mold for forming the second ribs 52, so that it is not necessary to provide a separate mold for forming the second ribs 52 in the construction method according to the present invention .

The second ribs 52 are formed at positions corresponding to the first ribs 16. The width of the second rib 52 may increase or decrease from the lower end toward the upper end. The width s2 of the second ribs 52 is equal to or substantially equal to the width s1 of the first ribs 16.

The second ribs 52 are integrated with the first ribs 16 to increase the total height of the ribs. As shown in Fig. 3, the height h1 of the first rib 16 and the height h2 of the second rib 52 are combined to form a rib having a total height h (= h1 + h2).

The site topping concrete part (50) is formed by placing concrete so as to cover the upper surface of the PC slab part (10) and the light weight body (30). As described above, the concrete laid between the lightweight bodies 30 forms the second ribs 52.

In the present invention, since the lightweight body 30 is provided on the upper surface of the PC slab portion 10, the amount of concrete used can be greatly reduced even if a field topping concrete portion having the same thickness as the conventional method is formed.

A continuous slab may be constructed by placing reinforcing bars in the field topping concrete portion 50 and applying post tension.

FIG. 4 shows a structure in which the composite rib slab is connected to the composite beam 5. In FIG. 4, reference numeral 19 denotes a flat plate provided to prevent the field topping concrete from flowing out between the two first ribs 16.

The composite beam 5 is made up of a steel frame 1 and a concrete member 3. The composite rib slab 100 is installed so that a jaw 17 is spread over the concrete member 3.

The use of the composite rib slab 100 facilitates the placement of the reinforcing bars 6 at the end of the slab 100 and facilitates filling the site topping concrete solidly at the end of the slab 100 It has the advantage that continuous moment design is possible.

In addition, since the slab-side effective area of the composite beam 5 increases, the bending strength of the composite beam increases.

5 shows a structure in which the composite rib slab 100 is connected to the reinforced concrete beam 7. In FIG. The jaw 17 of the composite rib slab 100 is installed so as to cover the lower jaw 7a of the reinforced concrete beam 7. [

FIG. 6 shows a structure in which the composite rib slab 100 is connected to the composite beam 9. The jaw 17 of the composite rib slab 100 is installed so as to cover the lower jaw 9a of the composite beam 9. [

The concrete leakage preventing plate 19 does not need to be installed because the concrete in Fig. 5 and Fig. 6 blocks the gap between the first ribs 16.

The composite rib slab 100 may be variously modified. 7, the first rib 16 may extend further toward the beam 5 than the horizontal plate 12, but the jaw 17 may not be formed on the first rib 16, The first rib 16 and the horizontal plate 12 may extend so as to have the same length but the jaw 17 may not be formed and the first rib 16 may be formed on the horizontal plate 12 And the jaw 17 may be formed on the first rib 16. 7 to 9, the same reference numerals as in Figs. 1 to 6 denote the same elements.

FIG. 10 is a cross-sectional view showing a composite rib slab according to a second embodiment of the present invention, and FIG. 11 is a sectional view showing the composite rib slabs installed to be connected to each other. 10 and 11, the same reference numerals as those in Figs. 1 to 9 denote the same components.

The composite rib slab 200 includes a PC slab portion 10, a lightweight body 30 provided on the PC slab portion 10, a PC slab portion 10 and a lightweight body 30, And a site topping concrete portion 50 having a concrete structure. Since the PC slab portion 10 is the same as the PC slab portion 10 of the first embodiment, the description thereof will be omitted here.

In the composite rib slab 200, the lightweight bodies 30 provided at both ends in the width direction (x direction) of the PC slab 10 have the inclined surfaces 31 and 33.

The inclined surface 31 allows the one surface of the second rib 52 to be inclined so that the width of the second rib 52 increases as it goes upward.

The inclined surface 33 is formed so as to face the both ends to form a dummy rib 54 having a sharp bottom. The inclined surface 33 allows a part of the upper vertical load VF to be transmitted to and supported by the first rib 16 through the site topping concrete portion 50 so that the partial load is transferred to the horizontal plate 12 . As such, the dummy ribs 54 do not support the upper vertical load VF, but transfer part of the upper vertical load VF to the first rib 16 to alleviate stress concentration by the cantilever .

Meanwhile, a filling material 60 for filling the gap between adjacent PC slab portions 10 may be installed at the lower end. As the filler 60, urethane foam, silicon, or the like may be used.

Fig. 12 shows a modification of the composite rib slab 200. Fig. In the composite rib slab 200, the lightweight bodies 30 provided at both ends of the PC slab 10 in the width direction (x direction) have inclined surfaces 31 and 34.

The inclined surfaces 34 are formed so as to face the both ends to form the dummy ribs 54 having an inverted triangular cross-sectional shape (a bottom-pointed cross-sectional shape). The dummy ribs 54 play the same role as the dummy ribs 54 described above.

As described above, in the present invention, the lightweight body 30 is provided on the upper surface of the PC slab portion 10. However, when the PC slab portion 10 is carried or laminated, the lightweight body 30 may be damaged. In order to solve such a problem, a supporting member is provided on the upper surface of the PC slab portion 10 in the present invention. FIG. 13 is a front view showing a composite rib slab having such a support member, and FIG. 14 is a side view showing the composite rib slabs stacked.

The support member may include a lightweight block 41 and a panel 42 provided on the upper surface of the lightweight block 41. The support member may be installed at approximately 0.9 m to 1.2 m from both longitudinal ends of the PC slab portion 10, preferably from the end of the PC slab portion 10.

The lightweight block 41 may be provided on both sides of the reinforcing bars 14 and may be made of a hard material having a higher strength than the light weight body 30, for example, lightweight cement, lightweight concrete, or the like.

The panel 42 is mounted on two light blocks 41, which may be made of wood, plastic, or the like.

The support member may be composed of the light block 41 and the panel 42, but may also be made of the light block 41 alone. Fig. 15 shows a structure in which a composite rib slab is laminated using a support member made only of a lightweight block 41. Fig. Since the height of the reinforcing bars 14 is low in the composite rib slab, the first ribs 16 and the reinforcing bars 14 can be prevented from interfering with each other only by the lightweight block 41. [

Meanwhile, the technical idea according to the present invention can also be applied to an inverse rib slab. FIG. 16 is a cross-sectional view showing a structure in which the present invention is applied to an inverse rib slab, and FIG. 17 is a front view showing the inverted rib slab connected to a beam. 16 and 17, the same reference numerals as in Figs. 1 to 15 denote the same elements.

The inverse rib slab (composite rib slab) 400 includes a PC slab portion 410, a lightweight body 30, and a site topping concrete portion 450.

The PC slab portion 410 includes a horizontal plate 412 and a plurality of first ribs 416. The first ribs 416 are formed to extend upward from the upper surface of the horizontal plate 412. The plurality of first ribs 416 are formed at predetermined intervals.

The lightweight body 30 is installed along the longitudinal direction (y direction) of the slab on both sides of the first rib 416 on the upper surface of the horizontal plate 412, and preferably on the upper side of both sides of the first rib 416, The light ends of the light weight body 30 extend across the jaws 417 and the cavity 70 is formed under the light weight body 30. Lightweight body 30 and cavity 70 reduce concrete usage and weight.

The upper ends of the light weight bodies 30 are higher in height than the upper surfaces of the first ribs 416 and the two lightweight bodies on both sides of the first ribs 416 serve as molds for forming the second ribs 452 .

The central axis C3-C3 of the first rib 416 and the central axis C4-C4 of the second rib 452 coincide with each other. This is because the central axis C3-C3 and the central axis C4- The central axes C3-C3 (C4-C4) are structurally substantially coincident such that the first and second ribs 416 and C4 coincide or the first and second ribs 416 and 452 are integrated to behave like one rib. The central axes C4-C4 are slightly inclined while the first and second ribs 416 and 452 are structurally and integrally in conformity with the structural axes C3-C3 (C4-C4) .

The width s3 of the first ribs 416 and the width s2 of the second ribs 452 may be set as an alternative to the configuration in which the central axes C3 to C3 coincide with the central axes C4 to C4, s4 correspond to each other and the second rib 452 can be formed at a position corresponding to the first rib 416. [ This is because the width s3 of the first rib 416 and the width s4 of the second rib 452 are the same or substantially the same or at least the width of the upper end of the first rib 416 and that of the lower end of the second rib 452 The first and second ribs 416 and 452 are integrated and act like one rib without excessive stress concentration at the connection portions of the first and second ribs 416 and 452 because the widths are the same or substantially the same it means.

The first ribs 416 and the second ribs 452 are integrated by at least one of a reinforcing bar 14, a wire (not shown in the figure), a shear connection member (not shown in the figure), and a shear key . Therefore, the first and second ribs 416 and 452 can be integrally combined to resist stress, and excessive stress concentration can be prevented from being connected to the connecting portions of the first and second ribs 416 and 452.

Reference numeral 418 denotes a plate for preventing the concrete from flowing out between the two first ribs 416, and 419 is a concrete panel installed in the x direction to prevent the slab from being twisted.

Fig. 18 shows a structure in which a modified example of the composite rib slab 400 is connected to the beam 5. The composite rib slab is filled with concrete because the lightweight body 30 is not provided in a portion close to the beam 5, so that the cavity 70a close to the beam 5 is filled with concrete. In addition, since the concrete leakage preventing plate 418 is not provided, the concrete is filled up to the web.

The construction method of the composite rib slab 100 according to the present invention will now be described.

First, the PC slab portion 10 is prepared (or manufactured). Since the PC slab portion 10 can be produced by utilizing the existing production facilities, it can be produced without adding additional production facilities.

The lightweight body 30 may be installed at the time of manufacturing the PC slab portion 10 or after the PC slab portion 10 is transported to the site. It is preferable that the light weight body 30 is fixed (joined) to the PC slab portion 10 when the PC slab portion 10 is manufactured. However, the light weight body 30 may be broken due to the top load during transportation and / or stacking of the PC slab portion 10. This problem can be solved by providing a support member.

Then, the PC slab portion 10 is transported to a construction site and installed. Figs. 4, 5 and 6 illustrate that the PC slab portion 10 is installed on beams 5, 7, and 9.

After the installation of the PC slab portion 10 is completed, a concrete leakage preventing plate 19 and the like are installed and the field topping concrete 50 is laid. The site-topping concrete 50 is placed so as to cover the PC slab portion 10 and the lightweight body 30. The portion of the concrete placed between the lightweight bodies 30 is poured at a portion corresponding to the first rib 16 Thereby forming the second ribs 52. The second ribs 52 and the first ribs 16 can be integrally moved by at least one of the reinforcing bars 14, the wire, the shear connection member, and the shear key (not shown).

The configuration in which the central axis C1-C1 of the first rib 16 coincides with the central axis C2-C2 of the second rib 52 and / or the configuration in which the width s2 of the second rib 52 is the first The first ribs 16 and the second ribs 52 are formed so as to have a perfect relationship with the width s1 of the ribs 16 and the positions of the second ribs 52 corresponding to the positions of the first ribs 16. [ And the upper load transmitted to the second rib 52 can be transmitted to the first rib 16. The second ribs 52 are disposed in the first ribs 16,

On the other hand, since the connecting portion between the composite rib slab 100 and the beam 5 is easy to place the reinforcing bars 6 and is easy to fill with the field topping concrete, the moment continuous design is possible.

The construction method of the composite rib slab 100 has been described above. The construction method of the composite rib slab 200, 400 and the composite rib slab having three or more first ribs can be easily understood by those skilled in the art And the description thereof will be omitted.

In addition, although the technical idea of the present invention is more preferably applied to the unidirectional slab, the present invention may be applied to the unidirectional slab, which will be apparent to those skilled in the art with reference to the present specification, and a detailed description thereof will be omitted.

10, 410: PC slab portion 12, 412: horizontal plate
16, 416: first rib 30: lightweight body
50, 450: field topping concrete section 52, 452: second rib
100, 200, 400: Composite rib slab
s1, s3: width of the first rib s2, s4: width of the second rib
C1-C1, C3-C3: center axis of the first rib
C2-C2, C4-C4: the central axis of the second rib

Claims (7)

(a) installing a PC slab portion having a plurality of first ribs extending downward from a lower surface of a horizontal plate and a horizontal plate at a construction site; And
(b) forming a site topping concrete portion by placing concrete so as to cover the upper surface of the PC slab portion and the lightweight body after the step (a)
The first rib is formed in the PC slab portion Extending along the longitudinal direction,
The lightweight body is disposed on the upper surface of the horizontal plate along the longitudinal direction,
And the second ribs are formed by placing the field topping concrete in the spaced apart spaces,
The center axis C2-C2 of the second rib coincides with the center axis C1-C1 of the first rib or the width s2 of the second rib corresponds to the width s1 of the first rib,
The first rib and the second rib are integrated together to resist stress,
A filling material 60 is installed to fill a gap between neighboring PC slab portions,
The PC slab part is manufactured at the factory and then transferred to the construction site,
The site topping concrete is placed in direct contact with the PC slab part and the lightweight body,
Wherein the thickness of the site topping concrete portion is changed according to the load, and the PC slab portion has a constant size. The method according to claim 1,
The lightweight bodies provided at both ends in the width direction of the PC slab portion are formed to include the inclined surfaces 33 and 34 on both sides so that the concrete poured between the inclined surfaces 33 and 34 has a dummy rib ribs 54 are formed,
Wherein the dummy ribs allow a portion of the upper vertical load (VF) to be transferred to the first rib through the site topping concrete portion. The method according to claim 1,
Wherein the filler (60) is made of urethane foam or silicon. delete delete 4. The method according to any one of claims 1 to 3,
A method of manufacturing and constructing a composite rib slab, the method comprising: placing a lightweight body on a concrete surface after concrete is laid when manufacturing a PC slab part in a factory, thereby fixing the lightweight body to the PC slab part. 4. The method according to any one of claims 1 to 3,
A support member is provided on the upper surface of the PC slab portion,
Wherein when the composite rib slab is stacked in a plurality of layers, the support member supports the upper load to prevent breakage of the lightweight slab.

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