KR101439867B1 - Compact tendon structure and prestressed concrete girder of the same - Google Patents

Abstract

The present invention relates to a compact tendon structure for use in a prestressed concrete girder, comprising: a plurality of tension members arranged in the girder and composed of a strand bundle providing tension; A tension member receiving portion embedded in the inside of the girder and receiving the plurality of tension members; A fixing unit for fixing both ends of the tension member; And one or more spacing members provided within the tension member receiving portion to fix the position of the tension member and to maintain the spacing between the individual tension members, And at least one horizontal plate extending in the lateral direction of the outer plate and an opening portion in which a longitudinal portion of the other side opposite to the outer plate is opened is provided.
The compact tendon structure according to an embodiment of the present invention can fix the position of the tension member and maintain the gap between the individual tension members to prevent the tensions from being tangled or interfered with each other, It is effective.

Description

Technical Field [0001] The present invention relates to a compact tendon structure and a prestressed concrete girder having the same,

The present invention relates to a compact tendon structure for prestressing a prestressed concrete girder, and more particularly, to a compact tendon structure for a prestressed concrete girder which prevents interference between tension members in providing tension by maintaining the spacing of individual tension members .

A prestressed concrete girder is a structure that increases the load-bearing force acting on the structure or introduces a tension force to resist deflection or crack generated by overload or use.

Meanwhile, a conventional prestressed concrete girder is manufactured by introducing a prestress in a longitudinal direction by using a high strength steel wire for a concrete having a spherical or I-shaped cross-section for use as a flexural member.

These methods include pre-tensioning and post-tensioning. The pre-tension method is a method of arranging the steel wire in the longitudinal direction in advance and introducing the compressive stress to the concrete by installing the concrete after introducing the tensile force in advance and then tightening the concrete after the concrete is hardened. In the post- tension method, It is a method to introduce compressive stress to concrete by installing concrete, placing concrete after it is hardened, inserting steel wire and fixing tension on concrete end. Since the pretensioning method is required to tighten the steel wire in advance, it is applied only to the girders of 20 m or less manufactured by the factory because it takes a lot of production equipment such as rebound band, and generally, the post tension method is widely applied.

Conventionally, as shown in FIG. 1, by inserting the tension members one by one into the tension member accommodating portion after all of the concrete portions have been manufactured, the diameter of the accommodating portion of the tension member should be secured at least twice as large as the total cross- , There is a problem that an unnecessary tension member receiving space is required.

In addition, there is a problem that the tension members are tangled together by pushing the tension members one by one.

In addition, even if the tension member is initially placed at a specific position intended for designing, there is a problem that the tension members are arranged irregularly due to a change in the arrangement position of the tension members due to the tension generated in the process of tensioning the tension members.

In addition, if the arrangement is irregular as described above, there is a problem that the tension generated after the construction by the tension member does not reach the design tension.

The present invention is made by recognizing at least any one of the requirements or problems that occur in the conventional tent structure as described above.

In one aspect, the present invention aims to provide a compact tendon structure in which a plurality of tension members are installed at one time by embedding, thereby reducing the void space inside the tension member receiving portion.

According to one aspect of the present invention, there is provided a method of fixing a position of a tension member and maintaining a gap therebetween, thereby preventing a tangling phenomenon and interference between tension members when the tension member is provided with a tension force, It is an object of the present invention to provide a tensile structure.

Another object of the present invention is to provide a compact tendon structure capable of reducing the number of tension members requiring installation by constituting a tension member as a high strength strand.

In accordance with one aspect of the present invention, there is provided a compact tension structure for use in a prestressed concrete girder, comprising: a plurality of tension members arranged on the girder to constitute a strand bundle providing tension; A tension member receiving portion embedded in the inside of the girder and receiving the plurality of tension members; A fixing unit for fixing both ends of the tension member; And one or more spacing members provided within the tension member receiving portion to fix the position of the tension member and to maintain the spacing between the individual tension members, And at least one horizontal plate extending in the lateral direction of the outer plate and an opening portion in which a longitudinal portion of the other side opposite to the outer plate is opened is provided.

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Also preferably, the outer plate is provided in a bent form, and the horizontal plate may extend from the bent portion of the outer plate.

Preferably, the horizontal plate may have a plurality of protrusions for fixing the position of the tension member.

Also, preferably, the projecting portion may be provided on at least one of the upper surface and the lower surface of the horizontal plate.

Preferably, the plurality of tension members are provided to be fixed by a single fixing unit having a plurality of fixing ports.

According to another aspect of the present invention, there is provided a concrete structure comprising: a longitudinally extending concrete member; at least one compact tendon structure provided in the concrete member to provide a tensile force to the concrete member; The present invention provides a prestressed concrete girder having at least one tendon accommodating portion accommodating therein a plurality of reinforcing frames forming a frame of the concrete member.

Preferably, the tendon structures may be arranged in a line below the section of the concrete member.

Also preferably, the concrete member may have an I-shaped cross section.

Preferably, the girder may further include a tensile structure formed to be curved downward from the end side to the center side of the concrete member.

Preferably, the reinforcing frame further comprises a plurality of reinforcing bars arranged at predetermined intervals in the longitudinal direction within the concrete member, a plurality of longitudinal reinforcing bars connecting and supporting the reinforcing bars, And a cover reinforcement provided at the upper portion of the accommodating portion and the tensile accommodating portion to prevent the tendon structure from being separated from the reinforcement.

According to an embodiment of the present invention as described above, a plurality of tension members are bundled together by a gap holding member to be installed at one time to reduce the void space inside the tension member accommodating unit, There is an effect that a structure can be provided.

According to one embodiment of the present invention, by including one or more spacing members that hold the position of the tension member and maintain the spacing between the individual tension members, in the course of straining the individual tension member disposed at a particular position, It is possible to prevent the tension members from being tangled or interfered with each other and to exert sufficient tension on the design.

According to an embodiment of the present invention, there is provided a reinforced frame including a tender receiving portion, an effect that a compact tender structure is installed in a tender receiving portion, and an upper portion is sealed with a cover reinforcing bar to prevent the departure of the compact tendon structure have.

According to an embodiment of the present invention, the tension member is formed of a bundle of high strength stranded wires, thereby reducing the number of fixing portions and the number of times of introduction of the tension force, thereby reducing labor consumption and improving the construction speed.

According to one embodiment of the present invention, by introducing a high-strength stranded wire into the tension member, the yield and the grouting amount of the tension member accommodating portion are reduced, thereby reducing the construction cost.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a photograph showing the cross-sectional details of a conventional tension member and a gap holding member. Fig.
FIG. 2 is a perspective view illustrating a state of engagement of a tension member and a gap holding member according to an embodiment of the present invention. FIG.
3 is a perspective view of a spacing member according to an embodiment of the present invention;
Figure 4a is a cross-sectional view of a compact ten- tenne structure in accordance with an embodiment of the present invention.
Figure 4b is a cross-sectional view of a compact ten- tenne structure in accordance with another embodiment of the present invention.
5 is a perspective view of a girder end portion provided with a compact tendon structure according to an embodiment of the present invention;
6 is a cross-sectional view taken along line AA in Fig.
FIG. 7 is a perspective view of a prestressed concrete girder according to an embodiment of the present invention; FIG.
8 is a perspective view of a prestressed concrete girder according to another embodiment of the present invention.
9 is a cross-sectional view taken along line BB in Fig.
10A to 10D are views illustrating a process of installing a reinforced frame according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Hereinafter, a compact tendon structure and a prestressed concrete girder having the same according to an embodiment of the present invention will be described in detail with reference to the drawings.

2 through 6, the compact ten-story structure 100 according to an exemplary embodiment of the present invention includes a tension member 110, a tension member accommodating unit 120, a fixing unit 130, a spacing member 140, As shown in FIG.

First, referring to FIGS. 2 to 6, a tension member 110 according to an embodiment of the present invention will be described.

As shown in FIG. 2, the tension member 110 is provided inside the girder G to prevent cracks in the lower portion of the girder G by providing the prestressed concrete girder G with a tensile force.

Further, the tension member 110 may be formed by twisting a plurality of strands (strands). However, the tension member 110 is not limited to the stranded wire, and various materials can be utilized as long as it is a material capable of providing tension to the girder G. In addition, a coating for protecting the straining member 110 may be additionally formed on the outer circumferential surface of the straining member 110.

The tension member 110 is exposed through the fixing hole 131 of the fixing unit 130 and is exposed to the outside of the fixing member 130 to be fixed to the wedge member 132 of each fixing hole 131 formed in the fixing unit 130 ≪ / RTI >

In recent years, the tensile strength of each tension member 110 is improved by constructing the tension member 110 by utilizing the high strength stranded wire (2160 MPa, 2400 MPa), and the tensile strength of the tension member 110 applied to the girder G is improved The number of the fixing units 130 and the number of times of introducing the tensions, thereby improving the construction speed and reducing the cost.

Next, with reference to FIGS. 2 to 6, a description will be given of the stress receptor 120 according to an embodiment of the present invention.

The tension member receiving portion 120 accommodates a plurality of tension members 110 to protect the plurality of received tension members 110 from salt, oxygen, moisture or external impact, It serves to guide the location.

Next, a fixing unit 130 according to an embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. The fixing unit 130 may include a plurality of fixing holes 131 and a plurality of wedge members 132.

 The fixing unit 130 is provided at both ends of the girder G, and fixes and fixes the tension member 110 in a taut state. The tension member 110 may be fixed to the fixing port 131 by a frictional force acting on the inner circumferential surface of the wedge member 132 and the outer circumferential surface of the tension member 110,

5, the fixing unit 130 may be fixed by a single fixing unit 130 having a plurality of fixing ports 131 to which a plurality of tension members 110 are fixed .

The tension member 110, the tension member receiving portion 120, and the fixing portion 130 are well known in the art and will not be described in detail.

Next, with reference to FIGS. 2 to 6, a gap holding member 140 according to an embodiment of the present invention will be described. The gap holding member 140 may be composed of an outer plate 141 and a horizontal plate 142 and may further include a protrusion 143. [

The spacing member 140 is a member that secures the position of the tension member 110 and maintains the spacing between the respective tension members 110 when the plurality of the tension members 110 are bundled and assembled at a time. A plurality of tension members 110 may be dispersedly disposed in a space defined by the outer plate 141 and the horizontal plate 142.

3, the gap holding member 140 may include at least one horizontal plate 142 extending from the outer plate 141 and the outer plate 141 constituting the outer surface, (142) may be arranged in the horizontal direction at a predetermined distance from the inner surface of the outer plate (141).

3, the spacing member 140 includes a curved outer plate 141 and a plurality of horizontal plates 142 extending from the curved portion of the outer plate 141 .

In addition, at least one spacing member 140 may be disposed at predetermined intervals along the longitudinal direction of the tension member 110 so that the plurality of tension members 110 do not tangle with each other or interfere with each other.

By providing the spacing member 140 in this way, it is possible to arrange the tension member 110 at a specific position and to maintain the spacing between the individual tension members 110 so that the individual tension members 110 It is possible to prevent the position of the other tension members 110 from being changed in the process of tension and to prevent the tensions 110 from being tangled or interfered with each other and to exert sufficient design tension.

The plurality of tension members 110 are bundled and spaced apart by the gap holding member 140 so as to reduce the void space inside the tension member accommodating portion 120 so that the installation sectional area of the stress member accommodating portion 120 It is possible to provide a compact tensile structure 100 that has been reduced in size and increase the amount of substantial eccentricity of the tension member 110. [

The outer plate 141 serves as a support frame for the gap holding member 140 and can form a skeleton outside the gap holding member 140.

In addition, the outer plate 141 may be provided in a bent plate shape supporting the side surface as shown in FIG. However, the present invention is not limited to this embodiment, and any structure such as a semicircular plate-like or polygonal plate-like structure may be used as long as the horizontal plate 142 is provided so as to surround the tension member 110 and extend in the horizontal direction .

As shown in FIG. 3, the horizontal plate 142 is one or more plate-like members extending in the horizontal direction from the outer plate 141. The horizontal plate 142 is a member that functions to prevent interference or entanglement between the tension members 110 by spacing the tension members 110 disposed in the upper and lower rows at a predetermined interval.

4A, the projection 143 may be provided on the upper surface of the horizontal plate 142 to fix the position of the individual tension member 110 and to maintain a gap therebetween, and as shown in FIG. 4B Likewise, it may be provided on both sides of the horizontal plate 142.

4A and 4B, the protrusion 143 is not limited to the rectangular cross-sectional shape, but may be formed in any shape that can fix the position and maintain the gap between the tension members 110, , A semi-circular shape, or the like.

Next, a prestressed concrete girder G according to an embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG.

The prestressed concrete girder G may include a concrete member 200, one or more compact tendon structures 100, and a plurality of reinforcing frames 300.

A prestressed concrete girder (G) is a structure that increases the load-bearing force acting on a structure or introduces a tension force to resist deflection or crack generated by overload or use.

In addition, the prestressed concrete girder (G) is manufactured by introducing a prestress in a longitudinal direction using a high strength steel wire to a square or I-shaped cross-section concrete for use as a flexural member.

The concrete member 200 may be formed to extend in the longitudinal direction, and may have at least one compact tendon structure 100 therein. Also, the concrete body may be provided with high-strength concrete in consideration of the stress acting on the girder G. Hereinafter, the concrete member 200 used in the prestressed concrete girder G is well known to those skilled in the art, and a detailed description thereof will be omitted.

7, the compact tendon structure 100 may be provided in a line in a lower portion of a cross section of the concrete member 200 as shown in FIG. 7, As shown in FIGS. 8 and 9, a compact tendon structure 100 formed to be curved downward from the end side to the center side of the concrete member 200 may be additionally provided. However, the arrangement of the compact ten-story structure 100 is not limited to the above-described one.

10A to 10D, the reinforcing frame 300 may include a reinforcing net 310, a longitudinal reinforcing bar 320, a tensile receiving portion 330, and a cover reinforcing bar 340.

10A to 10D illustrate a process of installing the reinforcing frame 300 in accordance with an embodiment of the present invention. Referring to FIG. 10A to FIG. 10D, a mounting bar B for mounting the reinforcing frame 300 is installed on the end of the frame G, A plurality of reinforcing ribs 310 are installed on the steel bar rods 310 of the reinforcing bar 310 by installing the longitudinal reinforcing ribs 320 to fix the reinforcing bar 310, The step of disposing the compact tendon structure 100 in the tennet receiving portion 330 as shown in Fig. 10C, and the step of disposing the cover reinforcement 340 in the upper portion of the tender receiving portion 330 as shown in Fig. 10D ). ≪ / RTI >

The reinforced frame 300 has a tensile receiving portion 330 to receive the compact tenant structure 100 and a compact tendon structure 100 is installed in the tensile receiving portion 300. The tensile receiving portion 300 Is covered with the cover reinforcing bar 340, it is possible to prevent the compact tendon structure 100 from being detached.

The reinforced frame 300 corresponds to a well-known matter in the art, and therefore, a detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And will be apparent to those skilled in the art.

100: compact tendon structure 110: tension member
120: tension member receiving portion 130:
131: Fixture 132: Wedge member
140: spacing member 141: outer plate
142: horizontal plate 143: protrusion
G: Prestressed concrete girder 200: Concrete member
300: Rebar Frame 310: Rebar Network
320: longitudinal reinforcement 330: tensile receiving part
340: Cover Reinforcement B: Fixed Steel Bar
R: Steel rod rail

Claims (11)

In a compact tendon structure used in a prestressed concrete girder,
A plurality of tension members arranged in the girder and composed of a strand bundle providing tension;
A tension member receiving portion embedded in the inside of the girder and receiving the plurality of tension members;
A fixing unit for fixing both ends of the tension member; And
And at least one spacing member disposed within the tension member receiving portion to fix the position of the tension member and to maintain the spacing between the individual tension members,
The space-
And at least one vertical plate extending in the transverse direction of the outer plate and an opening portion in which the longitudinal portion of the other side opposite to the outer plate is opened. Compact tendon structure.
delete The method according to claim 1,
Wherein the outer plate is provided in a bent form,
Wherein the horizontal plate extends from the folded portion of the outer plate.
The method according to claim 1,
Wherein the horizontal plate has a plurality of projections for fixing the position of the tension member.
5. The method of claim 4,
Wherein the protruding portion is provided on at least one of an upper surface and a lower surface of the horizontal plate.
The method according to claim 1,
Wherein the plurality of tension members are secured by a single fuser having a plurality of fuser holes.
A concrete member extending in the longitudinal direction;
The at least one compact tendon structure according to any one of claims 1 to 3, wherein the at least one compact tendon structure is provided within the concrete member to provide a tensile force to the concrete member. And
And a plurality of reinforcing frames having at least one tendon receiving portion in which the compact tendon structure is received, the plurality of reinforcing frames forming a frame of the concrete member.
8. The method of claim 7,
Wherein the compact tendon structure comprises a lower tendon structure arranged in a row below the section of the concrete member.
8. The method of claim 7,
Wherein the concrete member is formed in an I-shaped cross-section.
9. The method of claim 8,
Wherein the compact tendon structure further comprises an upper tendon structure formed to be curved downward from an end portion side of the concrete member toward a center portion side.
8. The method of claim 7,
Wherein the reinforcing frame includes a plurality of reinforcing bars disposed at predetermined intervals in the longitudinal direction within the concrete member, a plurality of longitudinal reinforcing bars connecting and supporting the reinforcing bars, And a cover reinforcement provided on the upper portion of the tensile receiving portion to prevent the tendon structure from being separated from the reinforcement.

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