KR100648046B1 - Beam and Girder Reinforcing Apparatus using External Post-Tension and Reinforcing Method using the same - Google Patents

Abstract

The present invention relates to a device and a method for reinforcing a beam and a girder lacking strength using an external post-tension method, wherein the beam reinforcement device is made of a PS steel wire or a PS steel bar and a long steel material having wedge cones 29 attached to both ends thereof. 10; A compression member 20 fixed to a lower surface of the slab supported by a beam requiring reinforcement and having a predetermined length provided with fixing plates 27 for fixing the tension member 10 at both ends thereof; A pair of end brackets 30 fixed to an upper side of a beam requiring reinforcement and slidably supported at a lower portion of the compressive material 20; It is characterized in that it comprises a middle bracket 40 is fixed to the lower side of the side of the beam requiring reinforcement while being spaced downward at a predetermined interval from the center of the compressive material 20 to support the central portion of the tension member (10) do.

Post Tension, Beam, Reinforcement, Fixture, Fixing Bracket, Support Bracket

Description

Beam and Girder Reinforcing Apparatus using External Post-Tension and Reinforcing Method using the same}

1 is a schematic diagram showing a tension section generated when the existing external post-tension method is applied to the structure of the continuous section.

Figure 2 is a schematic diagram showing an example in which the beam reinforcement device is applied according to the present invention.

Figure 3 is a front view showing the compression material of the beam reinforcement device according to the present invention.

Figure 4a is a front view showing the end bracket of the beam reinforcement device according to the present invention, Figure 4b is a side view thereof.

Figure 5a is a front view showing the middle bracket of the beam reinforcement device according to the present invention, Figure 5b is a side view thereof.

6 is a schematic view showing an example in which the girder reinforcement device according to the present invention is applied.

Figure 7a is a front view showing a fixing bracket of the girder reinforcement device according to the invention, 7b is a side view thereof.

<Explanation of Signs of Major Parts of Drawings>

10: tension member 20: compression member

21,22: "a" section 23: filler

27: fixing plate 29: wedge cone

30: end bracket 31,32: protrusion

34: lose weight 36: bolt fastener

38: sliding plate 40: middle bracket

41, 42: protrusion 44: fat hole

46: bolt fastening hole 50: fixing bracket

52: attachment portion 54: protrusion

56: bolt fastener

The present invention relates to a beam and girder reinforcement apparatus using an external post-tension method, and to a method of reinforcing a beam and a girder using the same, and more specifically, to a beam or girder, a plurality of tension members, each of which is fixed at both ends to be movable, by an external force The present invention relates to a beam and girder reinforcement apparatus and a method of reinforcing a beam and a girder using the same by tension-fixing to offset the tensile force, thereby increasing the bending rigidity of the beam or the girder and preventing sagging.

The External Post-Tension Method is a method to reinforce existing structures in use and uses the elastic restoring force by tension of the tension member (wire) to stress in the direction opposite to the stress caused by the load on the beam or slab. By reducing the stress caused by the fixed load of the member to increase the strength of the member to increase the stability of the member effectively.

However, when the existing external post-tension method, which has been designed and used on the basis of the simple ground, is applied to the continuous ground structure, as shown in FIG. 1, the reinforcement member under the influence of the compressive stress generated by the tension of the tension member Tensile sections (areas enclosed with broken lines in Fig. 1) occur in the (beam or slab).

Accordingly, there is a problem that can cause a structural coupling harmful to the stability of the structure in the tension section of the member to be reinforced.

An object of the present invention is to provide a method and apparatus that can effectively cancel the tensile force that can be generated in the member to be reinforced (base material such as a beam or slab) when the external post-tension method is applied to the continuous interstructure.

An object of the present invention described above is a beam reinforcement apparatus by an external post-tension method, and made of a PS steel wire or a PS steel bar and a long steel material having wedge cone attached to both ends; A compression member fixed to a lower surface of the slab supported by a beam requiring reinforcement and having a predetermined length provided with fixing plates for fixing the tension member at both ends thereof; A pair of end brackets fixed to an upper side of the beam requiring reinforcement and slidably supported under the compressive material; It is achieved by a beam reinforcement device comprising an intermediate bracket which is fixed to the lower side of the side of the beam requiring reinforcement while being spaced downward at a predetermined interval from the center of the compression member to support the central portion of the tension member.

In a method of reinforcing a beam using the beam reinforcing device according to another aspect of the present invention, the support member is supported by a beam requiring the reinforcement of a compression material having a predetermined length provided with fixing plates for fixing the tension member at both ends Fixing to the lower surface of the slab, fixing an end bracket to slidably support the bottom plate of the compressive material on the upper side of the beam requiring reinforcement, and having a predetermined distance from the compressive material Fixing the intermediate bracket to the lower side of the side, arranging the tension member so that the center thereof is supported by the intermediate bracket, and tensioning the tension member with a predetermined tensile force by using a jack, and tensioning tension members provided at both ends of the compression member. There is provided a beam reinforcement method comprising the step of fixing to a fixing plate.

An object of the present invention is made of a PS steel wire or a PS steel bar and the long steel material is attached to the wedge cone; It is fixed to the lower surface of the slab supported by the girder requiring reinforcement, one end is provided with a fixing plate for fixing the tension member and the other end is provided with a first fixing bracket for fixing to one side of the beam supported by the girder A first compression material having; It is fixed to the lower surface of the slab supported by the girder requiring reinforcement, and at one end, a fixing plate for fixing the tension member is provided, and the other end is provided with a second fixing bracket for fixing to the other side of the beam supported by the girder. A second compressive material having; It is achieved by a girder reinforcement device comprising a first and second end brackets fixed to an upper side of a girder requiring reinforcement and slidably supported under the first and second compression members.

According to another aspect of the present invention, in the method for reinforcing girder using the reinforcement device, fixing the first and second compression member to the lower surface of the slab supported by the girder and the side of the beam, respectively; Fixing the first and second end brackets on the upper side of the girder requiring reinforcement to slidably support the first and second compressive members from below, and arranging the tension member so that its center is supported by the lower surface of the beam. And using a jack to tension the tension member with a predetermined tensile force, and fixing the tension member to the fixing plates provided at both ends of the first and second compression members.

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>

Figure 2 shows schematically a first embodiment in which a reinforcement device according to the invention is applied to a beam.

Referring to FIG. 2, a beam 1 constituting a building such as an apartment or a building is supported by a plurality of pillars 3, wherein the beam 1 supports the lower surface of the roof or floor 2. It is a member for supporting the vertical load of the roof or the floor 2. Beam reinforcement device according to an embodiment of the present invention is mounted on the lower surface of the floor (2) and the side of the beam (1) to withstand the vertical load of the building to further reinforce or increase the bending rigidity, deflection of the beam Or to prevent damage due to sag.

As shown in Figure 2, the reinforcing device according to the first embodiment of the present invention is a compression having a predetermined length provided with a tension member 10, a fixing plate 27 for fixing the tension member 10 at both ends thereof. Ash 20, an end bracket 30 on which the lower end of the compressive material 20 is slidably supported, and a lower side of the side of the beam 1 spaced at a predetermined interval below the central portion of the compressive material 20. It is attached to the middle portion of the tension bracket 10 is composed of an intermediate bracket (40). Therefore, the tension member 10 is tension-fixed in a triangular shape as a whole.

The tension member 10, i.e., the prestressing tension member, increases the flexural rigidity of the beam by its tensile force, and a PS steel wire, a deformed PS steel wire, a PS steel wire, a PS steel bar, a deformed PS steel bar, and the like are used. At both ends, wedge cones 29 for fixing to the fixing plate 27 are attached.

Compression material 20 is to absorb the tensile force generated in the vicinity of the coupling portion of the beam 1 and the column 4 by the tensile force of the tension member 10, as shown in Figure 3, to reinforce the beam By inserting the fillers 23 at regular intervals between the pair of "a" shaped steels 21 and 22 having a length slightly shorter than the span of (1), buckling is prevented by welding each other. Compression material 20 is fixed using an anchor bolt 25 on the lower surface of the slab (2) that is supported by a beam that requires reinforcement. And, both ends of the compression member 20 is coupled to the fixing plate 27 for fixing the long steel 10 tensioned by the jack.

The compression member 20 is provided with an end bracket 30 that bears a vertical component in a lower portion thereof so as to bear only a horizontal component of tensile force generated by the tension member 10. As shown in FIGS. 4A and 4B, the end bracket 30 has a pair of protrusions 31 and 32 formed at a central portion thereof, and a fat hole 34 is formed between the protrusions 31 and 32. A bolt hole 36 is formed at both sides of the lower part of the fat hole 34 and the protrusion. In addition, a sliding plate 38 is welded to the upper surface of the pair of protrusions 31 and 32 to support the lower portion of the compressive material 20 in a slidable manner. Thus, the end portion of the compressive material 20 becomes a simple support point structurally.

In the lower part of the side of the beam Bracket 40 is provided, as shown in Figures 5a and 5b, the middle bracket 40 has a pair of protrusions (41, 42) formed in the center, between the fat hole 44 Are formed, and a plurality of bolt holes 46 are formed on both side surfaces and the top surface thereof. The tension member 10 is supported by the lower surfaces of the pair of protrusions 41 and 42.

Referring to the method of reinforcing the beam using the reinforcement device configured as described above are as follows.

First, the compression member 20 having a predetermined length provided with a fixing plate 27 for fixing the tension member 10 at both ends is fixed to the lower surface of the slab supported by the beam requiring reinforcement ((a) Step), after fixing the end bracket 30 for slidably supporting the end of the compressive material 20 from the lower side to the upper side of the beam that needs to be reinforced (step (b)), the compressive material 20 The middle bracket 40 is fixed to the lower side of the side of the beam so as to have a predetermined interval (step (c)).

Next, the tension member 10 is disposed so that the center thereof is supported by the intermediate bracket 40, and the tension member 10 is tensioned with a predetermined tensile force by using a jack ((d) step), and the tension member 10 is tensioned. ) Is wedge fixed to the fixing plate 27 provided at both ends of the compressive material 20 using the wedge cone 29 (step (e)).

Referring to the operation of the reinforcing device of the present invention configured and used as described above are as follows.

When the compression member, the end bracket and the intermediate bracket are installed in a predetermined position and the tension member is disposed, the tension member is recognized as a predetermined tensile force by using a jack and then fixed by wedges in the holes of the fixing plates provided at both ends of the compression member. The flexural stiffness of the beam is increased by the tensile force of, and the compressive stress transmitted to the structure by the tension of the tension member is absorbed by the compressive material, so that the tensile force generated near the joint portion of the beam and the column is absorbed, so that unnecessary tension section is not generated.

That is, structural defects that may occur when the existing external post-tension method is applied to the continuous inter-structures are generated as the transverse compressive stress due to the tension generated when tensioning the tension member is transmitted to the structure. The compression material was newly installed to absorb the compressive stress to secure the stability against structural defects of the structure caused by the tensile stress.

Second Embodiment

Figure 6 shows a second embodiment in which the reinforcing device according to the present invention is applied to a girder. At this time, since the beam is located in the middle of the girder, unlike the first embodiment, the intermediate bracket is not necessary. This will be described in detail as follows.

As shown in Figure 6, the reinforcement device according to the second embodiment is made of a PS steel wire or PS steel bar and the long steel material 10 is attached to the wedge cone at both ends, and the slab bottom supported by the girder requiring reinforcement Fixing plate 27 is fixed to the one end is provided with a fixing plate 27 for fixing the tension member 10 and the other end has a predetermined length provided with a first fixing bracket 50 for fixing to one side of the beam supported by the girder A first compression member 20 and a fixing plate 27 fixed to the lower surface of the slab supported by the girder requiring reinforcement, one end is provided with a fixing plate 27 for fixing the tension member 10 and the other end is supported by the girder And a second compression member 20 'having a predetermined length provided with a second fixing bracket 50' for fixing to the other side of the second compression member 20, and fixed to the upper side of the side of the girder requiring reinforcement. 20) Sliding at the bottom of 20 ' The support consists of a first 1 and a second end bracket 30, 30 ', which.

Since the structure of the tension member 10, the first and second compression members 20 and 20 ′, and the first and second end brackets 30 and 30 ′ are the same as in the first embodiment, description thereof will be omitted. 1 and 2 fixing brackets 50 and 50 'will be described.

As shown in FIGS. 7A and 7B, the first and second fixing brackets 50 and 50 ′ are a pair of “a” shaped steels 21 constituting the first and second compressive materials 20 and 20 ′. It is a "T" shaped steel integrally formed with the attachment portion 52 formed with a bolt fastening hole 56 to be coupled to the protrusion 54 and the beam using an anchor bolt inserted between the (22).

The method of applying the reinforcing device according to the second embodiment configured as described above is as follows.

First, the first compressive material and the second compressive material are respectively fixed to the lower surface of the slab supported by the girder and the side of the beam (step (a)), and the first and second compression on the upper side of the girder requiring reinforcement Fixing the first and second end brackets to slidably support the ash at the bottom (step (b)).

Next, the tension member is disposed so that its center is supported by the lower surface of the beam, and the tension member is tensioned with a predetermined tensile force using a jack (step (c)), and the tension member is fixed to both ends of the first and second compression members. It is enough to fix the plate (step (d)).

As described above, according to the present invention, when the external post-tension method is applied to the continuous inter-structure, the structure of the structure according to the generation of tensile stress is newly established to absorb the compressive stress transmitted to the member to be reinforced by the tension member. It is effective to secure stability against defects.

On the other hand, when comparing the reinforcement method according to the present invention with existing reinforcement methods, the existing reinforcement method using a joint, such as steel, steel plate or carbon fiber increases the bearing capacity for the additional load of the member to increase the allowable load that the member can receive In contrast to the passive reinforcement method, the present invention reduces the stress caused by the existing fixed load by pre-acting the stress in a direction opposite to the stress caused by the load, and also increases the bearing strength of the member. It is an active method that effectively increases the allowable load.                     

It does not require concrete surface treatment compared with existing reinforcement methods, shorten the construction period, enable the use of upper space during reinforcement work, and it is convenient to apply in spaces with poor working conditions due to the characteristics of the construction method. The advantage is also applicable to the structure (deck slab, cheolgolbo).

Although the present invention has been described with reference to the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will include any modifications or variations that fall within the spirit of the invention.

Claims (12)

In the beam reinforcement apparatus by the external post tension method, A long steel 10 made of PS steel wire or PS steel bar and having wedge cones 29 attached to both ends thereof; A compression member 20 fixed to a lower surface of the slab supported by a beam requiring reinforcement and having a predetermined length provided with fixing plates 27 for fixing the tension member 10 at both ends thereof; A pair of end brackets 30 fixed to an upper side of a beam requiring reinforcement and slidably supported at a lower portion of the compressive material 20; It is characterized in that it comprises a middle bracket 40 is fixed to the lower side of the side of the beam requiring reinforcement while being spaced downward at a predetermined interval from the center of the compressive material 20 to support the central portion of the tension member (10) Beam reinforcement. The method of claim 1, The compressive material 20 is to prevent the buckling by coupling the filler 23 at a predetermined interval between the pair of "a" shaped steel 21, 22 having a length shorter than the span of the beam to be reinforced Beam reinforcement device characterized in that. The method according to claim 1 or 2, The end bracket 30 includes a pair of protrusions 31 and 32 spaced apart at regular intervals, a fat hole 34 formed between the protrusions 31 and 32, and the protrusions 31 and 32. It is formed integrally with the upper portion of the lower surface and consists of an extended portion formed with a plurality of bolt fastening holes 36, the upper surface of the pair of protrusions 31, 32 to support the lower portion of the compressive material 20 to be slidable Beam reinforcement device, characterized in that the sliding plate 38 is coupled. The method of claim 3, wherein The middle bracket 40 has a plurality of bolt fastening holes 46 formed at the edges, a pair of protrusions 41 and 42 are formed at the center thereof, and the pair of protrusions 41 and 42 are formed at the center thereof. Beam reinforcement device, characterized in that the fat hole 44 is formed between). The method of claim 1, The middle bracket 40 has a plurality of bolt fastening holes 46 formed at the edges, a pair of protrusions 41 and 42 are formed at the center thereof, and the pair of protrusions 41 and 42 are formed at the center thereof. Beam reinforcement device, characterized in that the fat hole 44 is formed between). In the method of reinforcing a beam using the beam reinforcing device of claim 1, (a) fixing a compressive material having a predetermined length provided with fixing plates for fixing the tension member at both ends to a lower surface of the slab supported by the beam requiring reinforcement; (b) fixing an end bracket on the upper side of the beam requiring reinforcement to slidably support the bottom plate of the compressive material at the bottom; (c) fixing an intermediate bracket to the lower side of the beam to have a predetermined distance from the compressive material; (d) arranging the tension member such that its center is supported by the intermediate bracket and tensioning the tension member to a predetermined tensile force using a jack; (e) fixing the tension member to a fixing plate provided at both ends of the compression member. In the girder reinforcement device by the external post tension method, A long steel 10 made of PS steel wire or PS steel bar and having wedge cones 29 attached to both ends thereof; A first fixing plate 27 is fixed to the lower surface of the slab supported by the girder requiring reinforcement, and a fixing plate 27 for fixing the tension member 10 is provided at one end, and the other end is fixed to one side of the beam supported by the girder. A first compression member 20 having a predetermined length provided with a fixing bracket 50; A second fixing plate 27 fixed to the lower surface of the slab supported by the girder requiring reinforcement, and a fixing plate 27 for fixing the tension member 10 at one end thereof and a second side for fixing the other side of the beam supported by the girder at the other end thereof. A second compressive material 20 'having a predetermined length provided with a fixing bracket 50'; A first and second end brackets 30 and 30 'fixed to an upper side of the girder requiring reinforcement and slidably supported under the first and second compressive materials 20 and 20'. Girder reinforcement device characterized in that. The method of claim 7, wherein The first and second compressive materials 20 and 20 'may have a filler 23 at regular intervals between a pair of " a " shaped steels 21 and 22 having a length shorter than the span of the girder to be reinforced. Girder reinforcement device characterized in that to prevent the buckling by combining. The method according to claim 7 or 8, The end bracket 30 includes a pair of protrusions 31 and 32 spaced apart at regular intervals, a fat hole 34 formed between the protrusions 31 and 32, and the protrusions 31 and 32. It is formed integrally with the upper portion of the lower surface and consists of an extended portion formed with a plurality of bolt fastening holes 36, the upper surface of the pair of protrusions 31, 32 to support the lower portion of the compressive material 20 to be slidable Girder reinforcement device characterized in that the sliding plate 38 is coupled. The method of claim 9, The first and second fixing brackets 50 and 50 'are inserted into and coupled between a pair of "a" shaped steels 21 and 22 forming the first and second compressive materials 20 and 20'. Girder reinforcement device characterized in that the protrusion portion 54 and the attachment portion 52 is formed integrally formed bolt fastening hole (56) to be coupled to the beam using a bolt. The method of claim 7, wherein The first and second fixing brackets 50 and 50 'are inserted into and coupled between a pair of "a" shaped steels 21 and 22 forming the first and second compressive materials 20 and 20'. Girder reinforcement device characterized in that the protrusion portion 54 and the attachment portion 52 is formed integrally formed bolt fastening hole 56 to be coupled to the beam using an anchor bolt. In the method of reinforcing girders using the girder reinforcement device of claim 7, (a) securing the first and second compressive members to the bottom of the slab supported by the girder and to the side of the beam, respectively; (b) securing first and second end brackets slidably supporting the first and second compressive members on the upper side of the girder requiring reinforcement; (c) arranging the tension member such that its center is supported by the lower surface of the beam and tensioning the tension member to a predetermined tensile force using a jack; (d) fixing the tension member to the fixing plates provided at both ends of the first and second compression members.

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