KR20150017445A

KR20150017445A - Precast concrete slabs using arctie bar connection

Info

Publication number: KR20150017445A
Application number: KR1020130093076A
Authority: KR
Inventors: 정연수; 김준형; 서태석; 정기택; 공민호; 이진섭; 강태성; 정기롱; 용 정; 섭 윤; 최훈국
Original assignee: 현대엔지니어링 주식회사; 현대건설주식회사; 주식회사 삼표산업; 주식회사 네비엔
Priority date: 2013-08-06
Filing date: 2013-08-06
Publication date: 2015-02-17

Abstract

The present invention relates to a precast cast slab (PC), an arc-tie bar for fastening a PC slab, and a PC slab structure using the arc-tie bar for simple and easy construction and for structural performance improvement. More specifically, PC slabs assemble each other on the upper side of the lower ground to fasten PC slab structure which includes arc shaped arc-tie bars having a specific curvature. Each PC slab has a plurality of holes for the arc-tie bars having a specific curvature connecting and penetrating the one side of the PC slab and the one side of upper surface, and has a plurality of holes for a grouting for grouting between the lower ground and the PC slab. The PC slab structure using arc-tie bars allows each thereof to insert in each hole for the arc-tie bars to connect the PC slabs.

Description

TECHNICAL FIELD The present invention relates to a precast concrete slab, an arc tie bar for the precast concrete slab, and a precast concrete slab using the arc tie bar.

The present invention relates to a precast concrete (PC) slab, an arc tie-bar for PC slab fastening, and a PC slab structure using the arc tie bar. More specifically, since the PC slab has a concave and convex geometry on the side, it is possible to distribute load transfer function and position between the members during construction. Thus, an arc tie bar having a specific curvature after precise binding between neighboring members can be obtained The present invention relates to a PC slab structure which is developed to perform a structural performance improvement function by simple insertion and mounting in a hole of a slab by simple and quick construction that does not require a grouting construction process.

Generally, the PC slab pavement method is a method of laying a PC slab made in advance at a factory for a consolidated base layer, and connecting neighboring members to each other by dowel bars or tie bars and grouting injection.

Such a PC slab pavement method is widely applicable to general roads, highways, airports, harbor aprons, container yards, factories, plants, parking lots, apartment roads, bicycle roads,

In addition, this PC slab pavement method is able to perform rapid construction and quick repair by using a pre-made concrete panel (PC slab), and makes custom-made functional package with excellent quality that meets various requirements through steam curing at the factory These high-quality concrete products have the advantage of ensuring long-term service life of the packaging.

1A shows a perspective view of a PC slab 1 using a conventional double well bar 2. Fig. 1B is an exploded front view of the PC slabs 1 using the conventional dowel bar 2. As shown in Fig. 1A and 1B, a conventional PC slab structure includes a dowel bar 2 protruding at a side of a side of a PC slab 1 and a dowel bar pocket 3 into which the dowel bar 2 is inserted ) It can be seen that a grouting hole 4 for grouting the dowel bar 2 and the PC slab 1 after the connection between the PC slabs 1 is formed.

A method of constructing a PC slab structure using a conventional dowel bar 2 will be briefly described as follows. A plurality of dowel bars 2 are inserted in a factory, and a plurality of wellbars pockets 3 and grouting holes 4 are formed After the PC slab 1 is manufactured, the PC slab 1 is transported to the site, the PC slab 1 is placed on the ground so that the dowel bar 2 and the dowel bar pocket 3 are aligned with each other, To construct a PC slab structure.

FIG. 2A is a cross-sectional view of PC slabs before grouting using a conventional dowel bar, and FIG. 2B is a cross-sectional view after grouting of PC slabs using a conventional dowel bar. As shown in FIG. 2B, the construction of the PC slab structure using the dowel bar of the conventional pocket bonding method increases the grouting volume of the multiwellbar pockets 3, thereby decreasing the economical efficiency and the workability. In filling the grout, There is a fear that voids may be generated, and there is a risk that there is a risk of breakage and safety accident during transportation and construction due to the protruded dowel bar (2).

3A to 3D are cross-sectional views of a PC slab structure using a conventional double-walled bar 2 according to the order of construction. 3A to 3D, the construction of the PC slab structure using the conventional dowel bar 2 of the hole joining method is performed by first placing the dowel bar 2 (FIG. 3) in one of the well bar insertion holes 5 of the PC slab 1 (See Fig. 3A), and when the dowel bar inflow holes 6 of the adjacent PC slabs 1 are aligned (see Fig. 3B), compressed air is applied to push the dowel bar 2 to the adjacent PC (See Fig. 3C) after the slab is moved to the dowel bar inflow hole 6 of the slab 1 (see Fig. 3D).

However, the construction of the PC slab structure using the conventional dowel bars of the hole joining method requires a step of injecting compressed air and a grouting process in the field, so that the workability of the PC slab structure is lowered due to an increase in workload, There is a fear that voids may be generated in the upper part of the dowel bar.

Korean Patent No. 0780370 Korea Patent No. 0687210

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an arc tie bar made of steel or high strength plastic material with simple and fast insertion It is possible to carry out the function of structural improvement while it is possible to construct, and it is possible to carry out the function of load transfer transfer function through the uneven geometry of the side of the PC slab and positional guidance between members during construction, Due to the elastic restraint of the synchronized arc tie bars, the restraint stress is not generated excessively due to the appropriate restraint and partial movement, and the joint spacing is kept narrow and uniform by the principle similar to that of continuous reinforcing steel reinforced concrete, PC slab construction using retainable arc tie bars It is.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

A first object of the present invention is to provide a PC slab structure in which PC slabs are assembled and fastened to an upper portion of a lower ground, wherein the PC slabs have arc-shaped arc tie bars having a specific curvature, And a plurality of arc tie bars for grouting between the lower ground and the PC slab are formed, and each of the plurality of arc tie bars is formed by a plurality of arc tie bars, And the PC slab is inserted into each hole for the arc tie bar to connect the PC slab.

Further, in such a PC slab structure, the arc tie bar may be inserted into a plurality of the PC slabs in contact with each other so that the holes for the arc tie bars are shaped to fit, and each of the PC slabs is coupled to each other.

And, in such a PC slab structure, the arc tie bar can be characterized by having a specific strain coefficient with respect to the temperature change.

Further, in such a PC slab structure, the arc tie bars can be characterized by being made of steel or high-strength plastic.

In this PC slab structure, each of the side surfaces of the PC slab is constituted by a concavo-convex geometry structure.

Further, in such a PC slab structure, a plurality of projecting portions protruding outward and an inwardly concave recess are alternately formed on the side surface of the PC slab so as to be fitted to another PC slab in contact with the PC slab .

A second object of the present invention is to provide a PC slab, which is assembled and fastened to each other by an arc tie bar having a specific curvature at an upper portion of a lower ground, wherein each of the PC slabs has a side surface, A plurality of holes for arc tie bars having the specific curvature are formed and a plurality of grouting holes are formed for grouting between the lower ground and the PC slab.

In this PC slab, each of the plurality of arc tie bars is inserted into each of the holes for the arc tie bar to connect the PC slabs to each other.

Further, in such a PC slab, each of the side surfaces may be characterized by a concavo-convex geometry structure.

Further, in such a PC slab, a plurality of protrusions protruding outward on the side surface and an inwardly concave recess are alternately formed, so that the side surfaces of the PC slabs to be contacted are shaped to one another.

A third object of the present invention is to provide an arc tie bar for assembling and fastening PC slabs attached to an upper portion of a lower ground, wherein the arc tie bar is arc-shaped having a specific curvature, A plurality of holes for arc tie bars having the specific curvature passing through one side of the surface are formed and a plurality of grouting holes are formed for grouting between the lower ground and the PC slabs. Arc tie bars can be achieved.

And each of the plurality of arc tie bars is inserted into each of the holes for the arc tie bars to connect the PC slabs.

Further, the arc tie bar may be inserted in a plurality of contacted PC slabs so that the holes for the arc tie bar are shaped so as to join the PC slabs to each other.

The arc tie bar may have a specific strain coefficient with respect to a temperature change.

Further, such an arc tie bar may be characterized by being made of steel or high-strength plastic.

As described above, according to the embodiment of the present invention, the arc tie bar made of steel or high-strength plastic material can be easily and quickly constructed by simple insertion (no mortar injection process) after PC slab mounting, And it is possible to precisely bind by the function of load distribution transfer through the uneven geometry of the PC slab side and the position guidance between the members during construction and it is possible to perform proper restraint and partial movement by the elastic deformation synchronized with the temperature change of the PC slab And the joint spacing is kept narrow and uniform by a principle similar to that of continuous reinforcing steel reinforced concrete, so that the structural stability and the excellent running flatness can be maintained.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, those skilled in the art will readily appreciate that various other modifications and variations can be made without departing from the spirit and scope of the present invention.

1A is a perspective view of a conventional PC slab using a dowel bar,
1B is an exploded front view of PC slabs using a conventional dowel bar,
FIG. 2A is a sectional view of a PC slab before grouting using a conventional dowel bar,
Figure 2b is a cross-sectional view of the PC slabs after grouting using conventional dowel bars
FIGS. 3A to 3D are cross-sectional views of a PC slab structure using a conventional dowel bar according to the order of construction,
4 is a perspective view of a precast (PC) slab according to an embodiment of the present invention,
5 is a plan view of a PC slab according to an embodiment of the present invention,
6 is a cross-sectional view of a PC slab schematically showing a state in which an arc tie bar is inserted according to an embodiment of the present invention,
FIG. 7 is a sectional view of a PC slab in which an arc tie bar is inserted according to an embodiment of the present invention;
8 is a perspective view of a PC slab structure using an arc tie bar according to an embodiment of the present invention,
9 is a flowchart of a method of constructing a PC slab structure using an arc tie bar according to an embodiment of the present invention,
10A is a cross-sectional view of a PC slab structure using conventional dowel bars after application and after the temperature has dropped,
FIG. 10B is a sectional view of a concrete structure using a conventional tie bar after the construction and after the temperature is lowered,
FIG. 10c illustrates a cross-sectional view of a PC slab structure using an arc tie bar according to an embodiment of the present invention after application and after the temperature has dropped.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, the construction, function, and construction method of the PC slab structure 100 using the arc tie bar 10 according to an embodiment of the present invention will be described. The PC slab structure 100 using the arc tie bar 10 according to the embodiment of the present invention includes a PC slab 1 having a plurality of arc tie bar holes 20 and a plurality of ground grouting holes 40, And an arc tie bar 10 which is inserted into the hole 20 for an arc tie bar formed in the slab 1. Hereinafter, the construction of the PC slab 1 and the arc tie bars 10 will be described in more detail.

4 is a perspective view of a precast (PC) slab 1 according to an embodiment of the present invention. And FIG. 5 is a plan view of a PC slab 1 according to an embodiment of the present invention.

4 and 5, the PC slab 1 according to the embodiment of the present invention is in the form of a panel having a specific thickness and a length and breadth, and is formed by connecting four side surfaces and one side of the upper surface, It can be seen that a plurality of holes 20 for arc tie bars are formed. The plurality of arc tie bar holes 20 are spaced apart from each other by a predetermined distance, and are formed with a specific curvature while passing through the upper surface and the side surface. Such a PC slab 1 is manufactured at a factory rather than at a site, and in a specific embodiment, it is manufactured to a thickness of 30 cm, 4 m 2 m, 3 m 2 m, and 2 m 1 m.

Therefore, arc tie bar 10 having a specific curvature is inserted into each of these arc tie bar holes 20, as will be described later. More specifically, after the side surfaces of the PC slab 1 are brought into contact with each other, the PC slab 1 and the PC slab 1 are brought into contact with each other, And the arc tie bars 10 are inserted and connected to and connect the PC slabs 1 to each other.

4 and 5, each of the side surfaces of the PC slab 1 according to an embodiment of the present invention is provided with the uneven geometry 30 so that it can be shaped and firmly contacted with each other . 4 and 5, on the side of each PC slab 1 according to an embodiment of the present invention, projecting portions 31 and recesses 32 protruding outwardly are alternately formed , It can be seen that it can be shaped and assembled with another PC slabs 1 in contact with the PC slabs 1.

Therefore, it is possible to perform accurate binding by the load transfer sharing function through the concave-convex structure 30 on the side of the PC slab 1 according to the embodiment of the present invention and the position guidance between members during construction.

The arc tie bar 10 according to an embodiment of the present invention is formed into an arc shape having a specific curvature. Therefore, it is inserted into each of the holes 20 for arc tie bars formed in the above-mentioned PC slab 1.

6 is a side view of a PC slab 1 schematically showing a state where an arc tie bar 10 is inserted according to an embodiment of the present invention. 6, about half of the arc tie bar 10 according to the embodiment of the present invention is inserted into the hole 20 for the arc tie bar formed in the PC slab 1, and this PC slab 1 The other half is connected to the hole 20 for arc tie bar formed in another PC slab 1 which is in contact with the PC tile 1 so that the PC slabs 1 are connected and fastened to each other.

In addition, a plurality of ground grouting holes 40 are formed on one side of the upper surface of the PC slab 1 according to an embodiment of the present invention. The ground grouting hole 40 is formed at the time of manufacturing the PC slab 1 and is formed not only for grouting between the arc tie bar 10 and the arc tie bar hole 20 but also between the PC slab 1 and the lower It is formed for grouting filling of empty space between ground.

7 is a cross-sectional view of a PC slab 1 showing a state in which an arc tie bar 10 is inserted according to an embodiment of the present invention. 7, the specific curvatures of the arc tie bar 10 and the arc tie bar 10 formed in the PC slab 1 coincide with each other, so that the arc tie bar 10 is inserted into the arc tie bar hole 20 And can be inserted and shaped in the same manner.

Therefore, the arc tie bar 10 according to the embodiment of the present invention is formed into a arc shape having a specific curvature and inserted into the hole 20 for the arc tie bar so as to be fitted, And partial restraint on the lateral deformation.

The arc tie bars 10 and the PC slabs 1 according to the embodiment of the present invention are manufactured by placing the PC slabs 1 on the ground and then placing the arc tie bars 10 in the arc tie bar holes 20 in a simple It is possible to fasten the PC slab 1 easily and quickly with the insertion (no mortar injection process), and simultaneously perform the function of improving the structural performance.

That is, the arc tie bar 10 according to the embodiment of the present invention is made of a material having a specific strain coefficient with respect to temperature change. In the concrete embodiment of the present invention, steel or high-strength plastic was used.

However, the arc tie bar 10 according to the embodiment of the present invention is not limited to the above-described structure in which the tie bar 9 is in a state of being synchronized with the temperature-dependent deformation of the PC slab 1 The restraint stress is not excessively generated due to the appropriate restraint by the elastic deformation and the partial movement, and at the same time, the joint interval is narrowed and uniformly maintained by the principle similar to the continuous reinforcing steel reinforced concrete, so that the structural stability and excellent running flatness can be maintained .

8 shows a perspective view of a PC slab structure 100 using an arc tie bar 10 according to an embodiment of the present invention. As shown in Fig. 8, the side surfaces of the PC slabs 1 are brought into contact with each other, and the side surfaces of the PC slabs 1 are brought into contact with each other, The arc tie bars 10 are inserted into the PC slabs 1, and the PC slabs 1 are assembled and fastened to each other.

Hereinafter, a construction method of the PC slab structure 100 using the PC slab 1 and the arc tie bar 10 will be described. 9 shows a flowchart of a method of constructing a PC slab structure 100 using an arc tie bar 10 according to an embodiment of the present invention.

First, a plurality of the PC slabs 1 and the arc tie bars 10 are produced in a factory, not in the field, at step S10. As mentioned above, the arc tie bars 10 are made of arc-shaped arc having a specific curvature and made of steel or high-precision plastic having a specific strain coefficient against temperature change.

As described above, the PC slab 1 to be manufactured is formed by the irregular geometry structure 30 so that the side surfaces can be firmly contacted with each other. The PC slab 1 has a plurality of So that the hole 20 for the arc tie bar is formed. A ground grouting hole 40 for grouting the ground and the empty space of the PC slab 1 is formed on the upper surface of the PC slab 1. That is, the PC slab 1 manufactured at the factory corresponds to a finished product having a plurality of side grouting holes 40, a hole 20 for an arc tie bar, and side surfaces having a concavo-convex geometry 30.

Then, a plurality of manufactured PC slabs 1 and a plurality of arc tie bars 10 are transported to the site (S20). After the PC slab 1 and the arc tie bar 10 are transported to the site, a plurality of PC slabs 1 are laid on the upper part of the ground (S30). At this time, since the side surface between the PC slabs 1 has the uneven geometry 30, it is possible to perform accurate binding by the load sharing function after contact between the side surfaces and by the positional guidance between members during construction. That is, by the uneven geometry 30 formed on the side surface, the load transfer sharing function and the forward, backward, leftward, and rightward positional guidance are performed during the construction, so that the accurate binding can be achieved easily.

A plurality of PC slabs 1 are installed on an upper part of the ground and an arc tie bar 10 is inserted into each of the plurality of arc tie bars formed on the PC slab 1 to connect and fasten the PC slabs 1 S40). Further, a grouting process for joining the arc tie bar 10 and the PC slab 1 after the arc tie bars 10 are inserted is not required. The arc tie bar 10 is formed in a shape having a specific curvature so that the arc tie bar 10 is formed to have a specific curvature so that the arc tie bar 10 can be aligned with the arc tie bar 10, The load transfer function between the PC slabs 1 and the partial restraint on the lateral deformation can be performed at the same time.

However, the arc tie bar 10 according to the embodiment of the present invention is not limited to the strain according to the temperature of the PC slab 1, The restrained stress is not excessively generated due to the appropriate restraint and partial movement due to the elastic deformation of the synchronized arc tie bar and the joint interval is kept narrow and uniform by the principle similar to the continuous reinforcing steel reinforced concrete, The flatness can be maintained.

10A shows a cross-sectional view of a PC slab structure 100 using conventional dowel bars 2 after application and after the temperature has dropped. 10B is a sectional view of the concrete slab structure 100 using the conventional tie bars 9 after the construction and after the temperature is lowered. 10c shows a cross-sectional view of a PC slab structure 100 using an arc tie bar 10 according to an embodiment of the present invention, after application and after the temperature is lowered.

As shown in FIG. 10A, in the case of the PC slab structure using the conventional double well bar 2, when the temperature is lowered after the construction, there is no crack in the concrete due to the absence of the lateral restraint stress. However, A clearance 8 between the slabs is generated by the sloping of the slab, resulting in a problem of poor penetration and poor running smoothness.

10B, in the case of the concrete slab structure using the conventional tie bar 9, when the temperature is lowered after the construction, the gap 8 between the slabs is not generated, However, since the concrete is shrunk, there is a problem that concrete cracks are generated due to excessive restraining stress.

The PC slab structure 100 using the arc tie bar 10 according to the embodiment of the present invention adopts only the advantages of the conventional dowel bar 2 and the tie bar 9, The conventional tie bar 9 is cracked due to excessive restraining stress due to the complete restraint. However, according to the embodiment of the present invention, the temperature of the slab The restraint stress does not occur excessively due to the appropriate restraint and partial movement due to the elastic deformation synchronized with the deformation due to the deformation, and at the same time, the joint spacing similar to the continuous reinforcing steel reinforced concrete is kept narrow and uniform to maintain the structural stability and excellent running flatness .

That is, as shown in FIG. 10C, in the case of the PC slab structure 100 using the arc tie bar 10 according to the embodiment of the present invention, when the temperature is lowered after the installation, It can be seen that there is no excessive restraining stress due to partial restraint by the elastic deformation (within the allowable range), the penetration of storm is reduced, and the running flatness is also good.

Finally, after the arc tie bar 10 is inserted to connect and fasten the PC slabs 1, the mortar is uniformly filled in the ground grouting holes 40 formed in the PC slab 1 to form the PC slabs 1 ) And the lower ground are maintained while maintaining the airtightness of the PC slab structure 100 (S50).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It is to be understood that such modified embodiments are within the scope of protection of the present invention as defined by the appended claims.

1: PC slab
2: Dowellba
3: Dowel bar pocket
4: Grouting Hole
5: Dowel bar insertion hole
6: Dowel bar inflow hole
8: Clearance
9: Taiba
10: Arc Tie Bar
20: hole for arc tie bar
30: Uneven geometry
31:
32:
40: Ground grouting hole
100: PC slab structure using arc tie bar

Claims

A PC slab structure in which PC slabs are assembled and fastened to an upper portion of a lower ground,
Characterized in that it comprises an arc-shaped arc tie bar having a specific curvature,
Each of the PC slabs has a plurality of holes for arc tie bars having the specific curvature passing through one side of the side surface and one side of the upper surface, and a plurality of grouting holes for grouting between the lower ground and the PC slab are formed And,
And each of the plurality of arc tie bars is inserted into each of the holes for the arc tie bar to connect the PC slabs.

The method according to claim 1,
Wherein the arc tie bar is inserted in the plurality of contacted PC slabs so that the holes for the arc tie bar are shaped so that the PC slabs are coupled to each other.

The method according to claim 1,
Wherein the arc tie bars have a specific strain coefficient with respect to temperature changes.

The method of claim 3,
Wherein the arc tie bars are made of steel or high-strength plastic.

The method according to claim 1,
Wherein each of the side surfaces of the PC slab has a concavo-convex geometry.

6. The method of claim 5,
Characterized in that a plurality of projecting portions protruding outwardly and an inner concave recess are alternately formed on the side surface of the PC slab so as to be in contour with another PC slabs in contact with the PC slab. structure.

A PC slab, which is assembled and fastened to an upper portion of a lower ground by arc-shaped arc tie bars having a specific curvature,
Each of the PC slabs has a plurality of holes for arc tie bars having the specific curvature passing through one side of the side surface and one side of the upper surface, and a plurality of grouting holes for grouting between the lower ground and the PC slab are formed Wherein the pre-cast concrete slab is a pre-cast concrete slab.

8. The method of claim 7,
And each of the plurality of arc tie bars is inserted into each of the holes for the arc tie bar to connect the PC slabs to each other.

8. The method of claim 7,
Wherein each of the side surfaces is formed by a concavo-convex geometry structure.

10. The method of claim 9,
Wherein a plurality of outward projecting portions and an inwardly concave recess portion are alternately formed on the side surface so that the side surfaces of the PC slabs to be contacted are shaped to each other.

An arc tie bar for assembling and fastening PC slabs attached to an upper portion of a lower ground to each other,
The arc tie bar is arc-shaped having a specific curvature,
Each of the PC slabs has a plurality of holes for arc tie bars having the specific curvature passing through one side of the side surface and one side of the upper surface, and a plurality of grouting holes for grouting between the lower ground and the PC slab are formed Wherein the tie bars are formed on the side walls of the tie bars.

12. The method of claim 11,
And each of the plurality of arc tie bars is inserted into each of the holes for the arc tie bars to connect the PC slabs.

12. The method of claim 11,
Wherein the arc tie bars are inserted in the plurality of contacted PC slabs so that the holes for the arc tie bars are shaped so as to join the PC slabs to each other.

12. The method of claim 11,
Wherein the arc tie bar has a specific deformation coefficient with respect to a temperature change.

15. The method of claim 14,
Characterized in that it is made of steel or high-strength plastic.