KR102409371B1 - Rib-type PC slab having welded wire mesh with upper end hook and method for manufacturing and construction of the rib-type PC slab - Google Patents

Abstract

A rib-type PC slab having a welded wire mesh according to an embodiment of the present invention includes a slab portion in the form of a flat plate; a plurality of ribs integrally formed on a lower surface of the slab at predetermined intervals; a plurality of shear wire meshes embedded in each rib part and disposed so that the upper end protrudes from the upper surface of the slab part; and a horizontal wire mesh embedded in the slab part and bound to the plurality of shear wire meshes, wherein the shear wire mesh includes a plurality of shear reinforcing bars disposed perpendicular to the ground, and an upper end of each shear reinforcing bar horizontally or downward. It includes a hook portion to be bent, and a plurality of horizontal reinforcing bars welded to one side of the plurality of shear reinforcing bars.

Description

Rib-type PC slab having welded wire mesh with upper end hook and method for manufacturing and construction of the rib-type PC slab }

The present invention relates to a rib-type PC slab having a welded wire mesh having an upper hook part and a method for manufacturing and constructing a rib-type PC slab, and more particularly, to a shear reinforcing bar embedded in the rib part and exposed up to the top of the slab part. A multi-rib PC slab with excellent shear strength is produced by reinforcing with a horizontal wire mesh using an automatically welded wire mesh with a hook part. It relates to a rib-type PC slab and a method for manufacturing and constructing a rib-type PC slab having a welded wire mesh having an upper hook part that can be used.

In general, reinforced concrete structures consist of the main structural parts of columns, beams, and slabs, and the columns are mainly subjected to compression, but resist shear forces by arranging hoops.

Beams and slabs mainly behave as flexural materials and receive shear force at the same time and resist shear by arranging reinforcing bars in the vertical direction of the beam member or perpendicular to the cracks, and this is called shear reinforcing bars.

Unlike the main bars, these shear reinforcing bars have many strands and are placed more toward the end, and the number of shear reinforcing bars greatly affects the width of the worker, the processing cost of the reinforcing bar material, the accuracy of spacing, and workability when placing.

In particular, in the case of precast concrete (PC: Precast Concrete) slabs manufactured at the factory, depending on the number of ribs acting as beams, single tee with one rib, double tee with two ribs, triti with three, and multi rib with four or more can be classified as absent. It is a huge burden to process and place shear reinforcing bars on these ribs or beams and weave them one by one by hand.

In addition, according to the structural standards, such shear reinforcing bars are required to be sufficiently settled and to exhibit proof strength by wrapping the main reinforcing bars in the longitudinal direction with standard hooks or welding them. The ribbed slab used in the PC method has a narrow rib width, so it is difficult to wrap the main bars by processing shear reinforcing bars into hooks, so there are exceptions in the structural standards. However, in the case of a long rib, such as a deep double tee slab, it is difficult to apply this exception.

That is, the only way to solve everything by processing and arranging the shear reinforcement of such a beam is to weld the upper and lower parts of the shear reinforcement and mechanize each shear reinforcement. It is appropriate to use the existing wire mesh automatically welded at regular intervals as a horizontal bending slab reinforcing bar, but it is not appropriate to use it standing up as a vertical shear reinforcing bar.

1 is a partial perspective view showing a multi-rib PC slab according to the prior art.

The conventional multi-rib PC slab 10 is a double tee slab having a pair of ribs, and includes a main bar 20 horizontally disposed under each rib part, a horizontal reinforcing bar 30 disposed horizontally in the slab part, and , It includes a plurality of hook reinforcing bars 50 that are vertically arranged so that the lower end is coupled to surround the main bar 20 and the upper end bent in the width direction is exposed from the upper surface of the slab part.

In the horizontal reinforcing bar 30, a plurality of horizontal reinforcing bars 32 and a plurality of vertical reinforcing bars 34 are arranged at predetermined intervals, and may be coupled to each other by wire or the like.

The hook reinforcing bar 50 is a shear reinforcing bar in which the upper end is bent in the width direction and vertically exposed from the upper surface of the slab. The lower end of the hook reinforcing bar 50 is formed to surround the main reinforcing bar 20 and may be additionally coupled with a wire. The middle of the hook reinforcing bar 50 may be coupled to the horizontal reinforcing bar 30 by wire.

By the way, in order to manufacture the conventional multi-rib PC slab 10, it is necessary not only to connect the plurality of horizontal reinforcing bars 32 and the plurality of vertical reinforcing bars 34 to each other, but also to connect the plurality of hook reinforcing bars 50 to the main bars ( 20) and the horizontal reinforcing bar 30 are individually connected to each other.

So, the conventional multi-rib PC slab is very cumbersome to manufacture, and since the plurality of hook reinforcing bars 50 are not directly connected, the shear strength is also weak.

Registered Patent Publication No. 10-1220678 "Cross-section optimization rib PC slab"

The present invention relates to a ribbed PC slab having a welded wire mesh having an upper hook part that can very easily manufacture and construct a slab structure having excellent strength, particularly a slab structure having excellent shear strength, using a PC slab having a plurality of ribs, and An object of the present invention is to provide a method for manufacturing and constructing a ribbed PC slab.

A rib-type PC slab having a welded wire mesh according to an embodiment of the present invention for achieving the above object includes: a slab portion in the form of a flat plate; a plurality of ribs integrally formed on a lower surface of the slab at predetermined intervals; a plurality of shear wire meshes embedded in each rib part and disposed so that the upper end protrudes from the upper surface of the slab part; and a horizontal wire mesh embedded in the slab part and bound to the plurality of shear wire meshes, wherein the shear wire mesh includes a plurality of shear reinforcing bars disposed perpendicular to the ground, and an upper end of each shear reinforcing bar horizontally or downward. It includes a hook portion to be bent, and a plurality of horizontal reinforcing bars welded to one side of the plurality of shear reinforcing bars.

The plurality of horizontal reinforcing bars may include a lower anchoring reinforcing bar welded to one lower end of the plurality of shear reinforcing bars, and a position fixing reinforcing bar welded to an upper side of the plurality of shear reinforcing bars and coupled to the horizontal wire mesh.

The plurality of horizontal reinforcing bars may further include a rib abdominal reinforcing bar that is welded to one lower side of the plurality of shear reinforcing bars when the rib portion is high.

The position fixing muscle and the rib abdominal muscle may have the same diameter (D1) as the shear reinforcement, and the lower anchoring muscle may have a diameter (D2) greater than the diameter (D1) of the shear reinforcement.

The positioning muscle may be coupled to support the horizontal wire mesh from below.

The hook portion may be bound to surround the vertical reinforcement of the field reinforcement wire mesh.

A method of manufacturing and constructing a rib-type PC slab according to an embodiment of the present invention includes: arranging a plurality of shear wire meshes vertically on the ground; binding a horizontal wire mesh vertically to the plurality of shear wire meshes; manufacturing the ribbed PC slab by installing the assembled shear wire mesh and horizontal wire mesh on the formwork and pouring concrete; Installing the field reinforcement wire mesh so that the upper hook portion of the shear wire mesh wraps the vertical reinforcement of the field reinforcement wire mesh; and pouring and curing concrete on the upper surface of the PC slab.

The shear wire mesh may include a plurality of shear reinforcing bars disposed vertically, a hook part in which the upper end of each shear reinforcing bar is bent horizontally or obliquely downward, and a plurality of horizontal reinforcing bars welded to one side of the plurality of shear reinforcing bars. have.

The plurality of horizontal reinforcing bars may include a lower anchoring reinforcing bar welded to one lower end of the plurality of shear reinforcing bars, and a position fixing reinforcing bar welded to an upper side of the plurality of shear reinforcing bars and coupled to the horizontal wire mesh.

The positioning reinforcing bar may have the same diameter (D1) as the shear reinforcing bar, and the lower anchoring reinforcing bar may have a larger diameter (D2) than the shear reinforcing bar (D1).

The horizontal wire mesh may be supported by being seated on a position fixing muscle of the shear wire mesh.

The step of installing the on-site reinforcement wire mesh may include installing a plurality of pedestals at predetermined intervals under the on-site reinforcement wire mesh to support the on-site reinforcement wire mesh.

According to the above-described method for manufacturing and constructing a ribbed PC slab and a ribbed PC slab having a welded wire mesh having an upper hook part of the present invention, a slab structure having excellent strength by using a PC slab having a plurality of ribs, in particular, shear A slab structure with excellent strength can be manufactured and constructed very easily.

1 is a partial perspective view showing a multi-rib PC slab according to the prior art.
Figure 2 is a cross-sectional view showing the on-site casting using the multi-rib PC slab according to the first embodiment of the present invention.
3 is a cross-sectional view illustrating an on-site casting using a multi-rib PC slab according to a second embodiment of the present invention.
Figure 4 is a side view showing the shear wire mesh.
5 is a plan view showing that binding reinforcing bars are welded to both sides of the horizontal wire mesh.
6 is a plan view showing that the binding wire mesh is welded to both sides of the horizontal wire mesh.
Figure 7 is a cross-sectional view showing the installation of the field reinforcement wire mesh on the top of the shear wire mesh of the multi-rib PC slab according to the first embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a modified example in which two shear wire meshes overlap one rib portion in FIG. 7 .
9 is a cross-sectional view showing the installation of the field reinforcement wire mesh on the top of the shear wire mesh of the multi-rib PC slab according to the second embodiment of the present invention.
FIG. 10 is a cross-sectional view showing a modified example in which two shear wire meshes overlap one rib portion in FIG. 9 .
11 is a perspective view showing a temporary pedestal used for manufacturing a multi-rib PC slab according to the first embodiment of the present invention.
12 to 17 are views showing the manufacturing and construction process of the multi-rib PC slab according to the first embodiment of the present invention.
18 to 23 are views showing the manufacturing and construction process of the multi-rib PC slab according to the second embodiment of the present invention.
24 is a cross-sectional view showing an on-site casting construction using a rib-type PC slab according to a third embodiment of the present invention.
25 is a side view showing a shear wire mesh.
26 is a plan view showing a horizontal wire mesh.
27 is a cross-sectional view showing the installation of the field reinforcement wire mesh on the top of the shear wire mesh of the rib type PC slab according to the third embodiment of the present invention.
28 to 33 are views showing the manufacturing and construction process of the rib-type PC slab according to the third embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present invention, terms such as 'comprising' or 'having' are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings.

Figure 2 is a cross-sectional view showing the on-site casting using the multi-rib PC slab according to the first embodiment of the present invention, Fig. 3 is the on-site casting construction using the multi-rib PC slab according to the second embodiment of the present invention It is a cross-sectional view showing one thing, FIG. 4 is a side view showing a shear wire mesh, and FIG. 5 is a plan view showing that binding reinforcing bars are welded to both sides of the horizontal wire mesh.

In the case of the first embodiment of FIG. 2 , the fixing muscle 136 is coupled to the horizontal wire mesh 140 and supported on the horizontal wire mesh 140 , and in the second embodiment of FIG. 3 , the fixing muscle 136 is coupled to the horizontal wire mesh 140 . ) is coupled to the bottom to support the horizontal wire mesh (140).

The multi-rib PC slab 100 of the present invention includes a slab part 150 in the form of a flat plate, a plurality of rib parts 160 integrally formed on the lower surface of the slab part at a predetermined interval, each rib part is embedded in the interior and the upper part is a slab. It includes a plurality of shear wire meshes 110 disposed to protrude from the upper surface of the part, and a horizontal wire mesh 140 embedded in the interior of the slab part and bound to the plurality of shear wire meshes.

In the PC slab 100 , two or more rib parts 160 may be integrally formed on the lower surface of the slab part 150 having a predetermined thickness and formed in a flat plate shape. Although the figure shows that a pair of rib parts 160 are formed, the present invention can be applied to a tri-T slab having three rib parts or a multi-rib slab having four or more rib parts. have.

The slab part 150 may be formed in a rectangular shape when viewed from above. The rib portion 160 may be formed in a shape close to an elongated rectangular parallelepiped. A corner portion where the rib portion 160 is connected to the slab portion 150 may be formed to be rounded. In addition, as shown in FIGS. 2 and 3 , both sides of the rib part 160 are inclined so that the upper width is greater than the lower width, and the cross section thereof may be formed in a trapezoidal shape.

The shear wire mesh 110 and the horizontal wire mesh 140 may be embedded in the PC slab 100 . The shear wire mesh 110 may be disposed in the center of the width direction of the rib portion 160 and the upper end may be exposed at the upper end of the slab portion 150 . The horizontal wire mesh 140 may be all buried in the slab part 150 and disposed to vertically cross the shear wire mesh 110 .

The shear wire mesh 110 may include a plurality of shear reinforcing bars 120 disposed perpendicular to the ground, and a plurality of horizontal reinforcing bars 130 welded to one side of the plurality of shear reinforcing bars.

The shear wire mesh 110 may include a plurality of shear reinforcing bars 120 arranged at predetermined intervals, and a plurality of horizontal reinforcing bars 130 disposed at a predetermined height on one side of each shear reinforcing bar 120 and welded. The shear reinforcing bars 120 and the horizontal reinforcing bars 130 are automatically welded by an automatic welding device, and may be manufactured as a shear wire mesh 110 of a rectangular outline having a predetermined size.

4, the horizontal reinforcing bar 130 is a lower anchoring reinforcing bar 132 welded to one lower end of the plurality of shear reinforcing bars 120, and a horizontal wire mesh ( It may include a position fixator 136 coupled to 140 and an upper anchorage muscle 138 welded to one upper end of the plurality of shear reinforcing bars 120 to support the on-site reinforcement wire mesh 170 .

The lower anchoring reinforcing bar 132 may be welded to the lower end of one side of the plurality of shear reinforcing bars 120 to fix the shear wire mesh 110 to the rib portion 160 of the PC slab and serve as an auxiliary of the main reinforcing bars.

The positioning reinforcing bars 136 may be welded to the upper portion of one side of the plurality of shear reinforcing bars 120 and coupled to the horizontal wire mesh 140 . In the first embodiment of FIG. 2 , the anchoring muscle 136 is coupled to the horizontal wire mesh 140 and supported on the horizontal wire mesh 140 , and in the second embodiment of FIG. 3 , the anchoring muscle 136 is the horizontal wire mesh 140 . ) is coupled to the bottom to support the horizontal wire mesh (140).

The horizontal wire mesh 140 may include a plurality of transverse reinforcing bars 142 arranged at predetermined intervals and a plurality of vertical reinforcing bars 144 welded to be orthogonal to an upper surface of the plurality of transverse reinforcing bars. A plurality of horizontal reinforcing bars 142 and a plurality of vertical reinforcing bars 144 are automatically welded to prepare and use the horizontal wire mesh 140 in advance.

As shown in FIG. 5 , a plurality of binding reinforcing bars 146 may be coupled to a plurality of transverse reinforcing bars 142 on the outside of the shearing wire mesh 110 in the horizontal wire mesh 140 . That is, in the plurality of transverse reinforcing bars 142 , the vertical reinforcing bars 144 are not welded to the outer both ends of the portion where the shear wire mesh 110 is disposed, and after the shear wire mesh 110 and the horizontal wire mesh 140 are combined, a plurality of The binding reinforcing bar 146 may be arranged to bind. In the pre-fabricated horizontal wire mesh 140 , the plurality of binding reinforcing bars 146 may be coupled to each other by binding wires, etc., rather than being welded to the plurality of horizontal reinforcing bars 142 .

The upper anchoring reinforcing bar 138 may be welded to the top of one side of the plurality of shear reinforcing bars 120 in order to support the on-site reinforcement wire mesh 170 in the field.

The on-site reinforcement wire mesh 170 may also include a plurality of transverse reinforcing bars 172 arranged at predetermined intervals, and a plurality of vertical reinforcing bars 174 welded to be orthogonal to the upper side of the plurality of transverse reinforcing bars. By automatically welding a plurality of horizontal reinforcing bars 172 and a plurality of vertical reinforcing bars 174, the field reinforcement wire mesh 170 can be prepared and used in advance.

The horizontal reinforcing bar 130 may further include a rib abdominal reinforcing bar 134 welded to one lower side of the plurality of shear reinforcing bars 120 when the rib portion 160 is high. The rib abdominal region 134 may reinforce the strength of the rib portion 160 when the height of the rib portion 160 is long.

The fixed position muscle 136 and the rib abdominal muscle 134 have the same diameter (D1) as the shear reinforcing bar 120, and the upper anchoring muscle 138 has a larger diameter (D2) than the diameter (D1) of the shear reinforcing bar 120 , and the lower setter muscle 132 may have a larger diameter D3 than the diameter D2 of the upper setter muscle 138 .

For example, the shear reinforcement 120, the rib abdominal muscle 134, and the positioning muscle 136 are formed to have a diameter (D1) of about 10 mm, and the upper anchoring muscle 138 has a diameter (D2) of about 13 mm. and the lower anchorage muscle 132 may be formed to have a diameter D3 of about 16 mm.

The lower anchoring reinforcing bar 132 anchors the shear wire mesh 110 inside the rib portion 160 of the PC slab and serves as an auxiliary of the main reinforcing bars, so it can be composed of the thickest reinforcing bars.

The upper anchoring reinforcing bar 138 is exposed to the upper surface of the slab part 150 of the PC slab and supports the on-site reinforcement wire mesh 170, so it can be composed of reinforcing bars having a medium diameter.

The positioning reinforcing bar 136 is coupled to the horizontal wire mesh 140 embedded in the slab part 150 of the PC slab, and concrete is poured and manufactured in advance. configurable.

On the other hand, as shown in FIG. 6, the plurality of binding reinforcing bars may be composed of a binding wire mesh 148 in which a plurality of vertical reinforcing bars and a plurality of horizontal reinforcing bars are welded. In this case, at both ends of the horizontal wire mesh 140 , the horizontal reinforcing bars 142 of the horizontal wire mesh 140 and the transverse reinforcing bars of the binding wire mesh 148 may overlap each other, contact or be adjacently bound.

7 is a cross-sectional view showing that the field reinforcement wire mesh is installed on the top of the shear wire mesh of the multi-rib PC slab according to the first embodiment of the present invention, and FIG. It is a cross-sectional view showing an arranged modified example, and FIG. 9 is a cross-sectional view showing that the field reinforcement wire mesh is installed on the top of the shear wire mesh of the multi-rib PC slab according to the second embodiment of the present invention, and FIG. 10 is a single rib in FIG. It is a cross-sectional view showing a modified example in which two shear wire meshes are arranged to overlap each other.

As shown in FIG. 7 , the positioning muscle 136 may be coupled to be supported on the upper surface of the horizontal wire mesh 140 . In the case of the first embodiment, since the horizontal wire mesh 140 is installed first and the shear wire mesh 110 is seated, the position fixing reinforcing bar 136 can be supported on the upper surface of the horizontal reinforcing bar 142 of the horizontal wire mesh 140 .

As shown in FIG. 8 , the shear wire mesh 110 may be disposed to overlap each rib part 160 by two. The two shear wire meshes 110 disposed to overlap have superior strength compared to the case where there is only one shear wire mesh.

On the other hand, the shear wire mesh 110, when viewed from the side, one shear wire mesh 110 as in FIG. 7 is disposed in the middle portion in the longitudinal direction, and a pair of overlapping shears as shown in FIG. 8 at both ends of the shear wire mesh 110 Wire mesh 110 may be used. In general, since it must be able to withstand a shear force of more than twice that of the middle part at both ends of the beam, it is possible to install one more overlapping shear wire mesh 110 at both ends of the beam. That is, the shear wire mesh 110 is disposed so that one is disposed in the middle portion and two overlapping at both ends, it is possible to efficiently support the shear force applied to the rib portion 160 .

As shown in Figure 9, the position fixing muscle 136 may be coupled to support the horizontal wire mesh 140 from the bottom. In the case of the second embodiment, since the shear wire mesh 110 is first installed and the horizontal wire mesh 140 is seated, the positioning reinforcing bar 136 can support the lower surface of the horizontal reinforcing bar 142 of the horizontal wire mesh 140 .

As shown in FIG. 10 , the shear wire mesh 110 may be disposed to overlap each rib part 160 by two. The two shear wire meshes 110 disposed to overlap have superior strength compared to the case where there is only one shear wire mesh.

On the other hand, the shear wire mesh 110, when viewed from the side, one shear wire mesh 110 as in FIG. 9 is disposed in the middle portion in the longitudinal direction, and a pair of overlapping shears as shown in FIG. 10 at both ends of the shear wire mesh 110 Wire mesh 110 may be used. In general, since it must be able to withstand a shear force of more than twice that of the middle part at both ends of the beam, it is possible to install one more overlapping shear wire mesh 110 at both ends of the beam. That is, the shear wire mesh 110 is disposed so that one is disposed in the middle portion and two overlapping at both ends, it is possible to efficiently support the shear force applied to the rib portion 160 .

11 is a perspective view showing a temporary pedestal used for manufacturing the multi-rib PC slab according to the first embodiment of the present invention, and FIGS. 12 to 17 are the manufacturing and A drawing showing the construction process.

The manufacturing of the multi-rib PC slab according to the first embodiment of the present invention and a slab construction method using the same will be described with reference to FIGS. 11 to 17 .

The temporary support 200 shown in FIG. 11 is for arranging the horizontal wire mesh 140 at a predetermined height from the ground. In order to support the rectangular horizontal wire mesh 140, the temporary pedestal 200 may be formed at a predetermined height and may have flat plate-shaped supports at both upper ends. The height from the lower surface of the temporary support 200 to the upper surface of the support corresponds to the height from the bottom of the PC slab to the lower surface of the horizontal wire mesh 140 .

First, as shown in FIG. 12 , the horizontal wire mesh 140 is arranged at a predetermined height using the temporary support 200 . At this time, the horizontal wire mesh 140 is a semi-finished product in which a plurality of horizontal reinforcing bars 142 and a plurality of vertical reinforcing bars 144 are welded, and there are no vertical reinforcing bars 144 at both ends of the horizontal wire mesh 140 .

Next, as shown in FIG. 13 , a pair of shear wire meshes 110 are sandwiched from both sides of the horizontal wire mesh 140 and vertically bound. Then, the position fixing reinforcing bars 136 of the shear wire mesh 110 are supported by the horizontal reinforcing bars 142 of the horizontal wire mesh 140 . It can be fixed so as not to move by binding between the contact portions of the horizontal wire mesh 140 and the shear wire mesh 110 with a binding wire.

Next, as shown in FIG. 14 , a plurality of binding reinforcing bars 146 are coupled to both edge portions of the horizontal wire mesh 140 . The binding reinforcing bar 146 has the same diameter as the vertical reinforcing bar 144 of the horizontal wire mesh 140, but is not pre-welded like the vertical reinforcing bar 144, and can be fixed by binding to the horizontal reinforcing bar 142 with a binding wire. have.

Next, as shown in FIG. 15 , the assembled horizontal wire mesh 140 and shear wire mesh 110 are installed in the formwork, and the multi-rib PC slab 100 is manufactured by pouring concrete. Of course, except for the temporary support 200, the assembled horizontal wire mesh 140 and shear wire mesh 110 are installed in the formwork. After pouring and curing the concrete to the height at which the upper end of the shear wire mesh 110 is exposed, the mold is separated to complete the multi-rib PC slab 100 as shown in FIG. 15 .

Next, as shown in FIG. 16 , the manufactured PC slab 100 is installed in the field and the field reinforcement wire mesh 170 is installed on the top of the shear wire mesh 110 . At this time, the transverse reinforcement 172 of the field reinforcement wire mesh 170 may be supported by the upper anchoring reinforcement 138 of the shear wire mesh 110 . The transverse reinforcing bar 172 and the upper anchoring reinforcing bar 138 may be bound and fixed by a binding wire.

Finally, as shown in FIG. 17, a formwork is installed around the field reinforcement wire mesh 170 on the PC slab 100, concrete is poured on the upper surface of the PC slab 100, cured, and then the formwork is separated. do. Then, the construction of the reinforced concrete slab in the field using the PC slab 100 according to the present invention is completed.

18 to 23 are views showing the manufacturing and construction process of the multi-rib PC slab according to the second embodiment of the present invention.

A manufacturing method of a multi-rib PC slab according to a second embodiment of the present invention and a slab construction method using the same will be described with reference to FIGS. 18 to 23 .

First, as shown in FIG. 18 , a plurality of shear wire meshes 110 are vertically placed on the ground. A plurality of supports (not shown) may be used to maintain the plurality of shear wire meshes 110 vertically arranged on the ground. At this time, the plurality of shear wire mesh 110 is a semi-finished product in which a plurality of shear reinforcing bars 120 and a plurality of horizontal reinforcing bars 130 are welded. No, if the height of the rib portion 160 is large, the rib abdominal region 134 is also welded together.

Next, as shown in FIG. 19 , the horizontal wire mesh 140 is vertically inserted into the plurality of shear wire meshes 110 and bound. At this time, the horizontal wire mesh 140 is a semi-finished product in which a plurality of horizontal reinforcing bars 142 and a plurality of vertical reinforcing bars 144 are welded, and there are no vertical reinforcing bars 144 at both ends of the horizontal wire mesh 140 . Then, the horizontal reinforcing bars 142 of the horizontal wire mesh 140 are supported on the position fixing reinforcing bars 136 of the shear wire mesh 110 . It can be fixed so as not to move by binding between the contact portions of the horizontal wire mesh 140 and the shear wire mesh 110 with a binding wire.

Next, as shown in FIG. 20 , a plurality of binding reinforcing bars 146 are coupled to both edge portions of the horizontal wire mesh 140 . The binding reinforcing bar 146 has the same diameter as the vertical reinforcing bar 144 of the horizontal wire mesh 140, but is not pre-welded like the vertical reinforcing bar 144, and can be fixed by binding to the horizontal reinforcing bar 142 with a binding wire. have.

Next, as shown in FIG. 21 , the assembled shear wire mesh 110 and the horizontal wire mesh 140 are installed in the formwork, and the multi-rib PC slab 100 is manufactured by pouring concrete. After pouring and curing the concrete to the height at which the upper end of the shear wire mesh 110 is exposed, the mold is separated to complete the multi-rib PC slab 100 as shown in FIG. 21 .

Next, as shown in FIG. 22 , the manufactured PC slab 100 is installed in the field and the field reinforcement wire mesh 170 is installed on the top of the shear wire mesh 110 . At this time, the transverse reinforcement 172 of the field reinforcement wire mesh 170 may be supported by the upper anchoring reinforcement 138 of the shear wire mesh 110 . The transverse reinforcing bar 172 and the upper anchoring reinforcing bar 138 may be bound and fixed by a binding wire.

Finally, as shown in FIG. 23, a formwork is installed around the on-site reinforcement wire mesh 170 on the PC slab 100, concrete is poured and cured on the upper surface of the PC slab 100, and then the formwork is separated. do. Then, the construction of the reinforced concrete slab in the field using the PC slab 100 according to the present invention is completed.

24 is a cross-sectional view illustrating an on-site casting using a ribbed PC slab according to a third embodiment of the present invention, FIG. 25 is a side view showing a shear wire mesh, and FIG. 26 is a plan view showing a horizontal wire mesh.

The rib type PC slab 100 of the third embodiment of FIG. 24 does not have an upper anchoring reinforcing bar 138 compared to the second exemplary embodiment of FIG. 3, but a hook portion 125 bent at the upper end of the shear reinforcing bar 120 to provide In addition, as in the second embodiment, the horizontal wire mesh 140 is supported by being seated on the upper surface of the fixing muscle 136 .

The rib-type PC slab 100 of the present invention includes a slab part 150 in the form of a flat plate, a plurality of rib parts 160 integrally formed on the lower surface of the slab part at predetermined intervals, each rib part is embedded in the interior of the slab and the upper part is a slab. It includes a plurality of shear wire meshes 110 disposed to protrude from the upper surface of the part, and a horizontal wire mesh 140 embedded in the interior of the slab part and bound to the plurality of shear wire meshes.

In the PC slab 100 , two or more rib parts 160 may be integrally formed on the lower surface of the slab part 150 having a predetermined thickness and formed in a flat plate shape. Although the figure shows that a pair of rib parts 160 are formed, the present invention can be applied to a tri-T slab having three rib parts or a multi-rib slab having four or more rib parts. have.

The slab part 150 may be formed in a rectangular shape when viewed from above. The rib portion 160 may be formed in a shape close to an elongated rectangular parallelepiped. A corner portion where the rib portion 160 is connected to the slab portion 150 may be formed to be rounded. In addition, as shown in FIG. 24 , both sides of the rib part 160 are inclined so that the upper width is greater than the lower width, and the longitudinal cross-section thereof may be formed in a trapezoidal shape.

The shear wire mesh 110 and the horizontal wire mesh 140 may be embedded in the PC slab 100 . The shear wire mesh 110 may be disposed in the center of the width direction of the rib portion 160 and the upper end may be exposed at the upper end of the slab portion 150 . The horizontal wire mesh 140 may be all buried in the slab part 150 and disposed to vertically cross the shear wire mesh 110 .

The shear wire mesh 110 includes a plurality of shear reinforcing bars 120 disposed vertically with respect to the ground, a hook portion 125 in which the upper end of each shear reinforcing bar is bent horizontally or obliquely downward, and a plurality of shear reinforcing bars on one side It may include a plurality of horizontal reinforcing bars 130 to be welded.

The shear wire mesh 110 may include a plurality of shear reinforcing bars 120 arranged at predetermined intervals, and a plurality of horizontal reinforcing bars 130 disposed at a predetermined height on one side of each shear reinforcing bar 120 and welded. The shear reinforcing bars 120 and the horizontal reinforcing bars 130 are automatically welded by an automatic welding device, and may be manufactured as a shear wire mesh 110 of a rectangular outline having a predetermined size.

After the shear reinforcing bars 120 and the horizontal reinforcing bars 130 are automatically welded to the shear wire mesh 110, the upper ends of the shear reinforcing bars 120 are bent at 90 to 120 degrees so that the upper end of each shear reinforcing bar 120 is horizontally or A hook portion 125 inclined downwardly may be formed.

As shown in FIG. 25 , the plurality of horizontal reinforcing bars 130 are welded to the lower anchoring reinforcing bar 132 that is welded to one lower end of the plurality of shear reinforcing bars 120 and the upper one side of the plurality of shear reinforcing bars 120 to be horizontal. It may include a position fixing muscle 136 coupled to the wire mesh 140 .

The lower anchoring reinforcing bar 132 may be welded to the lower end of one side of the plurality of shear reinforcing bars 120 to fix the shear wire mesh 110 to the rib portion 160 of the PC slab and serve as an auxiliary of the main reinforcing bars.

The positioning reinforcing bars 136 may be welded to the upper portion of one side of the plurality of shear reinforcing bars 120 and coupled to the horizontal wire mesh 140 . In the third embodiment of FIG. 24 , the position fixing muscle 136 may be coupled to the bottom of the horizontal wire mesh 140 to support the horizontal wire mesh 140 .

26, the horizontal wire mesh 140 may include a plurality of transverse reinforcing bars 142 arranged at predetermined intervals, and a plurality of vertical reinforcing bars 144 welded to be perpendicular to the upper surface of the plurality of transverse reinforcing bars. can A plurality of horizontal reinforcing bars 142 and a plurality of vertical reinforcing bars 144 are automatically welded to prepare and use the horizontal wire mesh 140 in advance. The separation distance between the plurality of horizontal reinforcing bars 142 and the separation distance between the plurality of vertical reinforcing bars 144 may be manufactured in various ways.

The plurality of hooks 125 is after the shear reinforcing bars 120 and the horizontal reinforcing bars 130 are automatically welded, the upper ends of the shear reinforcing bars 120 are bent at the same time to the upper end of each shear reinforcing bar 120 horizontally or downward It may be formed to be inclined to be disposed.

The field reinforcement wire mesh 170 may include a plurality of transverse reinforcing bars 172 arranged at predetermined intervals and a plurality of vertical reinforcing bars 174 welded to be orthogonal to the upper side of the plurality of transverse reinforcing bars. A plurality of horizontal reinforcing bars 172 and a plurality of vertical reinforcing bars 174 may be automatically welded to prepare and use an on-site reinforcement wire mesh 170 in advance.

When installing the field reinforcement wire mesh 170 at the upper end of the shear wire mesh 110, the bent parts of the hook parts 125 are arranged to surround the plurality of vertical reinforcing bars 174 of the field reinforcement wire mesh 170, and then, each hook The part 125 and the vertical reinforcing bar 174 may be coupled by binding with a binding wire. The hook parts 125 allow the on-site reinforcement wire network 170 to be bound to be fixed to the cast-in-place concrete 180 .

The horizontal reinforcing bar 130 may further include a rib abdominal reinforcing bar 134 welded to one lower side of the plurality of shear reinforcing bars 120 when the rib portion 160 is high. The rib abdominal region 134 may reinforce the strength of the rib portion 160 when the height of the rib portion 160 is long.

The fixed position muscle 136 and the rib abdominal muscle 134 have the same diameter (D1) as the shear reinforcing bar 120, and the lower anchoring muscle 132 has a larger diameter (D2) than the diameter (D1) of the shear reinforcing bar 120 can have

For example, the shear reinforcement 120, the rib abdominal muscle 134, and the positioning muscle 136 are formed to have a diameter (D1) of about 10 mm, and the lower anchoring muscle 132 to have a diameter (D2) of about 16 mm. can be formed.

The lower anchoring reinforcing bar 132 anchors the shear wire mesh 110 inside the rib portion 160 of the PC slab and serves as an auxiliary of the main reinforcing bars, so it can be composed of the thickest reinforcing bars.

The positioning reinforcing bar 136 is coupled to the horizontal wire mesh 140 embedded in the slab part 150 of the PC slab, and concrete is poured and manufactured in advance. configurable.

27 is a cross-sectional view showing the installation of the field reinforcement wire mesh on the top of the shear wire mesh of the rib type PC slab according to the third embodiment of the present invention.

As shown in FIG. 27 , the positioning muscle 136 may be coupled to support the horizontal wire mesh 140 from the lower surface. In the case of the third embodiment, since the shear wire mesh 110 is installed first and the horizontal wire mesh 140 is seated on the position anchor 136 from top to bottom, the position anchor 136 is the horizontal reinforcement 144 of the horizontal wire mesh 140 . can support the underside of

On the other hand, the drawing shows that both the horizontal reinforcing bars 130 and the hook part 125 of the pair of shear reinforcing bars 120 are disposed on one side (right side) of the shear reinforcing bars 120, but the horizontal reinforcing bars 130 ) and the hook portion 125 may be disposed on the outside of each shear reinforcing bar 120 . That is, in the shear wire mesh 110 on the left, the horizontal reinforcing bars 130 and the hook part 125 are disposed on the left side of the shear reinforcing bar 120 , and the horizontal reinforcing bars 130 and the hooks in the shear wire mesh 110 on the right side The part 125 may be disposed on the right side of the shear reinforcement 120 .

28 to 33 are views showing the manufacturing and construction process of the rib-type PC slab according to the third embodiment of the present invention.

The manufacturing of the rib-type PC slab according to the third embodiment of the present invention and a slab construction method using the same will be described with reference to FIGS. 28 to 33 .

First, as shown in FIG. 28, a plurality of shear wire mesh 110 is vertically placed on the ground. A plurality of supports (not shown) may be used to maintain the plurality of shear wire meshes 110 vertically arranged on the ground. At this time, the plurality of shear wire mesh 110 is a semi-finished product in which a plurality of shear reinforcing bars 120 and a plurality of horizontal reinforcing bars 130 are welded. There is no, if the height of the rib portion 160 is large, it is possible to use the ribs near the abdomen 134 are also welded together. In addition, the shear wire mesh 110 arranges a plurality of straight shear reinforcing bars 120 at a predetermined interval, welds the lower anchoring reinforcing bars 132 and the position fixing reinforcing bars 136, and then the upper end of each shear reinforcing bar 120 is 90~ By bending 120 degrees, the shear wire mesh 110 in which the hook parts 125 are formed can be manufactured in advance.

Next, as shown in FIG. 29 , the horizontal wire mesh 140 is inserted from the top down to the plurality of shear wire meshes 110 and is bound. Since the shear wire mesh 110 of this embodiment does not have an upper anchoring reinforcing bar 138, it can be easily seated by inserting the horizontal wire mesh 140 from top to bottom so that the hook portion 125 of the shear reinforcing bar 120 is inserted. At this time, the horizontal wire mesh 140 is a semi-finished product in which a plurality of horizontal reinforcing bars 142 and a plurality of vertical reinforcing bars 144 are welded, and the plurality of vertical reinforcing bars 144 are arranged at regular intervals up to both ends of the horizontal reinforcing bars 142. can Then, the horizontal reinforcing bar 142 of the horizontal wire mesh 140 may be supported on the position fixing reinforcing bars 136 of the shear wire mesh 110 . It can be fixed so as not to move by binding between the contact portions of the horizontal wire mesh 140 and the shear wire mesh 110 with a binding wire.

Next, as shown in FIG. 30 , the assembled shear wire mesh 110 and the horizontal wire mesh 140 are installed in the formwork, and concrete is poured to manufacture the rib type PC slab 100 . After pouring and curing the concrete to the height at which the upper end of the shear wire mesh 110 is exposed, the formwork is separated to complete the rib-type PC slab 100 as shown in FIG. 30 .

Next, the manufactured PC slab 100 is installed in the field, and the field reinforcement wire mesh 170 is installed on the top of the shear wire mesh 110 . At this time, as shown in FIG. 31, after placing the two vertical reinforcing bars 174 so that each upper hook part 125 of the shear wire mesh 110 surrounds the vertical reinforcing bars 174 of the field reinforcement wire mesh 170, It can be fixed by binding between the vertical reinforcing bar 174 and the bent portion of the hook portion 125 with a binding iron wire.

Next, as shown in FIG. 32 , the remaining plurality of vertical reinforcing bars 174 and a plurality of horizontal reinforcing bars 172 may be disposed and each joint portion may be bound with a binding wire. At this time, by installing a plurality of pedestals 178 at predetermined intervals under the on-site reinforcement wire mesh 170, it is possible to support the on-site reinforcement wire mesh 170. The pedestal 178 is formed in a U-shape in its cross section, and can support the field reinforcement wire mesh 170 not to sag with respect to the upper surface of the slab part 150 . A plurality of pedestals 178 may be removed after binding a plurality of vertical reinforcing bars 174 and a plurality of horizontal reinforcing bars 172, but a plurality of pedestals 178 that were installed at locations where the field reinforcement wire mesh 170 is easy to sag. can leave at least a portion of The pedestal 178 that is not removed can be fixed by binding it to the field reinforcement wire mesh 170 with a binding wire.

Finally, as shown in FIG. 33, a formwork is installed around the in-situ reinforcement wire mesh 170 on the PC slab 100, concrete is poured on the upper surface of the PC slab 100, cured, and then the formwork is separated. do. Then, the construction of the reinforced concrete slab in the field using the PC slab 100 according to the present invention is completed.

According to the method for manufacturing and constructing a ribbed PC slab and a ribbed PC slab having a welded wire mesh having an upper hook part of the present invention, a slab structure having excellent strength, especially shear strength, using a PC slab having a plurality of rib parts Excellent slab structures can be manufactured and constructed very easily.

In the above, an embodiment of the present invention has been described, but those of ordinary skill in the art can add, change, delete, or add components within the scope that does not depart from the spirit of the present invention described in the claims. Various modifications and changes of the present invention will be possible by this, and this will also be included within the scope of the present invention.

10: Multi-rib PC slab (prior art)
20: main bar 30: horizontal reinforcing bar
32: horizontal reinforcing bar 34: vertical reinforcing bar
50: hook reinforcing bar
100: rib type PC slab (invention)
110: shear wire mesh 120: shear reinforcement
125: hook 130: horizontal reinforcing bar
132: lower setter muscle 134: rib abdominal muscle
136: fixed position muscle 138: upper setter muscle
140: horizontal wire mesh 142: transverse reinforcement
144: vertical reinforcing bar 146: binding reinforcing bar
148: binding wire mesh 150: slab part
160: rib unit 170: field reinforcement wire mesh
172: horizontal reinforcing bar 174: vertical reinforcing bar
178: pedestal 180: cast-in-place concrete
200: temporary support

Claims (12)

a slab portion in the form of a flat plate;
a plurality of rib portions integrally formed on a lower surface of the slab portion at predetermined intervals;
a plurality of shear wire meshes embedded in each rib part and disposed so that the upper end protrudes from the upper surface of the slab part; and
Horizontal reinforcing bars and vertical reinforcing bars are welded in advance and bound to the plurality of shear wire meshes and include a horizontal wire mesh embedded in the interior of the slab,
The shear wire mesh is
A plurality of shear reinforcing bars disposed perpendicular to the ground;
A hook part in which the upper end of each shear reinforcing bar is bent horizontally or obliquely downward;
It is manufactured in advance including a plurality of horizontal reinforcing bars welded to one side of the plurality of shear reinforcing bars,
The plurality of horizontal reinforcing bars include a lower anchoring reinforcing bar welded to one side of the lower end of the plurality of shear reinforcing bars, a rib abdominal reinforcing bar welded to the lower one side of the plurality of shear reinforcing bars when the rib portion is high, and an upper side of the plurality of shear reinforcing bars It is welded to the horizontal wire mesh to support the horizontal wire mesh, including a position fixing muscle coupled to the horizontal wire mesh,
The hook portion is a rib-type PC slab having a welded wire mesh, characterized in that the horizontal reinforcing bars and the vertical reinforcing bars are welded and bound to surround the vertical reinforcing bars of the in-situ reinforcement wire mesh that is manufactured in advance and embedded in cast-in-place concrete. delete delete According to claim 1,
The position fixing muscle and the rib abdominal muscle have the same diameter (D1) as the shear reinforcement,
The lower anchoring reinforcing bar is a rib-type PC slab having a welded wire mesh, characterized in that it has a larger diameter (D2) than the diameter (D1) of the shear rebar. delete delete A step of arranging a plurality of shear reinforcing bars and horizontal reinforcing bars are welded in advance by standing upright on the ground a plurality of pre-fabricated shear reinforcing bars;
connecting horizontal reinforcing bars and vertical reinforcing bars to the plurality of shear wire meshes by vertically inserting a pre-fabricated horizontal wire mesh;
Installing the assembled shear wire mesh and horizontal wire mesh on the formwork and pouring concrete to produce a rib-type PC slab;
Installing the field reinforcement wire mesh so that the upper hook portion of the shear wire mesh is welded to the horizontal reinforcing bars and vertical reinforcing bars to surround the vertical reinforcing bars of the pre-fabricated field reinforcement wire mesh; and
Containing the step of pouring and curing the concrete on the upper surface of the PC slab,
The shear wire mesh includes a plurality of shear reinforcing bars disposed vertically, a hook part in which the upper end of each shear reinforcing bar is bent horizontally or obliquely downward, and a plurality of horizontal reinforcing bars welded to one side of the plurality of shear reinforcing bars,
The plurality of horizontal reinforcing bars include a lower anchoring reinforcing bar welded to one lower end of the plurality of shear reinforcing bars, a rib abdominal reinforcing bar welded to one lower side of the plurality of shear reinforcing bars when the rib portion is high, and an upper side of the plurality of shear reinforcing bars. It is welded and includes a position fixator coupled to the horizontal wire mesh to support the horizontal wire mesh from below,
The horizontal wire mesh is a method of manufacturing and constructing a rib-type PC slab having a welded wire mesh, characterized in that it is supported by being seated on a position fixing root of the shear wire mesh. delete delete 8. The method of claim 7,
The position fixing muscle has the same diameter (D1) as the shear reinforcement,
The method of manufacturing and constructing a rib-type PC slab having a welded wire mesh, characterized in that the lower anchorage has a larger diameter (D2) than the diameter (D1) of the shear reinforcement. delete 8. The method of claim 7,
The step of installing the on-site reinforced wire mesh includes the step of supporting the on-site reinforced wire mesh by installing a plurality of pedestals at predetermined intervals under the on-site reinforced wire mesh. and construction methods.

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