KR101522608B1 - Structure reinforcing method using prestress distribution apparatus and tendon - Google Patents

Abstract

The present invention relates to a structure reinforcing method using a stress distribution anchoring device and an external steel wire for freely arranging the external steel wire upon a reinforcing part of a structure, easily tensioning the external steel wire, and anchoring. The device which is manufactured for external steel wire to be anchored after being tensioned even on the bottom, side surface, and the center of a girder, even though the stress distribution anchoring device is installed on both ends of the girder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure reinforcement method using a stress-

The present invention relates to a structure reinforcement method using a stress distribution fixing port and an outer steel wire. More specifically, the present invention relates to a method of reinforcing a structure using an outer steel wire and a stress-dispersion fixing port, which is capable of freely arranging an outer steel wire according to a reinforcing part of a structure and fixing the outer steel wire easily after tension.

1 shows a construction example in which a prestress is introduced into a girder (a mold) for a bridge by using an external tensile material to reinforce it.

That is, by using a multistage fixing device that introduces a tensile force at both ends of the mold at both ends of the bridge and eliminates the concentration of local stress generated in the mold fixing part and effectively prevents deflection and crack at the center part, .

For this, FIG. 1 shows an end fusing plate 11 having both ends bent upwards to surround the lower part of the mold 2 and being fixed to both sides of the end of the mold 2 by the anchor bolts, A pair of end fixing devices 10 having fixed fixing holes formed on the lower side and both side surfaces of the end fusing plate 11;

An intermediate fixation which is formed by bending both ends of the mold 2 so as to surround the lower portion of the mold 2 and which is fixed by anchor bolts to the lower side of the middle two points of the mold 2 of the bridge 1 located between the end fixing devices 10, A pair of intermediate fixing devices 20 provided with automatic fixing ports formed on the lower side and both side surfaces of the intermediate fixing plate;

An A stretch material 31, a C stretch material 33 and an E stretch material 35 disposed at the lower side of the mold 2 of the bridge 1 and fixed at both ends to the end fusing device 10 in a stretched state, A G stretch material 37 disposed on both sides of the lower side of the mold 2 of the bridge 2 and fixed at both ends thereof to the end fixing device 20 in a tensioned state; A B stretch material 32 and a D stretch material 34 respectively tensioned and fixed to the intermediate fixing device 20 and an F stretch material 34 disposed on both sides of the lower side of the bridge 1 and being tension- And a plurality of external tensile members 30 composed of a plurality of external tension members 36.

By introducing the compressive force and the bending moment due to the tension of the tensile material in a multistage manner, the reinforcing effect at the central point portion is excellent and it is effective to effectively prevent the local stress concentration phenomenon occurring at both ends of the bridge.

However, in order to install such an external tensile material, the end fixing device 10 and the intermediate fixing device 20 must be installed in the middle between both ends of the girder and both end portions. Such an installation work is performed in the lower part of the girder In the case of a long-span girder having a long extension of the girder, the installation work of the end fixing device 10 and the intermediate fixing device 20 is repeated, so that the workability is very low Therefore, there is a problem in that the economical efficiency is inferior.

In addition, the external tensile material is made of a tensile material such as unbonded strand. In the fixing devices, the deterioration of the workability due to the settlement after the stretching is very large. The external fixture of the tensioned external tensile material (wedge- There has always been a problem of lowering workability due to installation.

Accordingly, the present invention can be manufactured so that the outer steel wire can be easily fixed to the fixture after the tension so that sufficient workability can be ensured during installation, and even if the fixture is installed at both ends of the structure, It is possible to improve the workability by overcoming the difficulty of installing an anchorage hole at the bottom of the girder by using the outer steel wire which is formed to be able to fix the outer steel wire after the tension, This is a technical problem to solve the provision of the structure reinforcement method.

In order to solve the technical problems,

First, outer strands are made of unbonded strands coated with PC strands. This unstiffened strand can be used with a large diameter unbonded strand. However, since the workability is reduced due to the weight and the like, it is necessary to use a non-stiffened strand with a small diameter, a thread is formed on the outer circumference, And a fixing nut is fastened to the threaded portion to easily fix the cap-shaped fixing member of the outer steel wire to the fixing plate of the stress distribution fixing hole.

The use of such a cap type fastening hole facilitates introduction of additional prestressing by using the fixing nut in the event that reinforcement of the outer steel wire is required in the future, and economical efficiency can be sufficiently secured since the workability is good.

Second, the position where the outer steel wire is fixed after the tension is an intermediate part between the both ends or the both ends in the case of the girder. In the conventional bracket type fixing device of wrapping the lower part of the girder at both ends and the middle part, If the anchor bolt is used to fix it, the amount of work in the lower space of the girder must be increased, so that the workability is greatly reduced and the air is also inevitably delayed.

The present invention relates to a fixing device for a fixing device, which comprises a bi-inclined fixing belt, a lower horizontally extending fixing belt formed to surround a bottom surface and a lower side surface of the girder from a lower end of the bi- A side fixation plate and a bottom fixation plate are formed at a stacking position so that an outer steel wire is disposed on the bottom and sides of the girder, So that the utilization of stress distribution anchorage can be greatly increased.

Since the cap type fastening hole according to the present invention is formed in advance at the end of the outer steel wire in the factory, it is possible to overcome the inconvenience of installing the fastening hole on the external steel wire at the high spot and since the fastening business uses the fixing nut, And it is possible to perform additional fixing work by simply rotating the fixing nut when the tension is required, which is very effective in terms of maintenance.

Also, even if the fixing device is used, even if the girder is installed at both ends, it is possible to have the effect of fixing the outer steel wire by the intermediate fixing device, and the tension of the outer steel wire, the fixing efficiency and the workability can be greatly improved.

In addition, since the outer steel wire can be installed only on the bottom surface and the side surface of the girder or on the bottom surface, it is required to work in accordance with the reinforcing purpose of the outer structure, so that it is possible to reinforce the girder efficiently.

1 is a reinforced perspective view of a structure (girder) using a conventional external tensile material,
FIGS. 2A, 2B, and 2C are views showing the construction of the outer steel wire and the stress-dispersion fixture of the present invention,
FIGS. 3A, 3B and 3C are explanatory perspective views of an outer steel wire and a stress distribution fixing member of the present invention,
FIGS. 4A and 4B are flowcharts of a method of reinforcing a structure using a stress-dispersion fixation port and an outer steel wire according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Outer Steel Wire 100 and Stress Distribution Dispenser 200 of the Present Invention]

FIGS. 2A, 2B and 2C are construction and construction contracts of the outer steel wire 100 and the stress-dispersion fixture 20 of the present invention.

First, as shown in FIG. 2A, the outer steel wire 100 uses a non-stick wire. The unbonded strand is formed of a covering material 120 surrounding the PC strand 110, and a cap-shaped fixing hole 130 is formed at an end thereof.

Although the outer steel wire 100 can be manufactured to have various diameters, the present invention uses a wire having a diameter of about 5 cm, thereby ensuring sufficient workability in transportation and installation.

The cap fixing member 130 is integrally formed at the end of the outer steel wire 100. The cap fixing member 130 is formed with an end insertion hole 131 through which the outer steel wire can be inserted, The end of the outer steel wire 100 is inserted into the steel pipe 100 to be integrated with an epoxy resin or the like.

A screw 133 is formed on the outer circumferential surface of the cap type fixing member 130 so that the fixing nut 132 can be fastened and fixed to the fixing plate 250 after the outer steel wire 100 is tightened by the fixing nut 132. [ .

At this time, the end face of the outer steel wire 100 is brought into contact with the inner side face of the end insert hole 131 of the cap type fixing hole 130 so that the outer steel wire 100 is sufficiently inserted into the cap type fixing hole 130.

The cap-shaped fixing member 130 may be installed at both ends of the outer steel wire 100 so that both ends of the outer steel wire 100 can be tensed.

2B and 2C, the stress-dispersed fixing fixture 200 according to the present invention includes a horizontal fixing rods 320 (see FIG. 2B) for passing through the lifting holes formed at both ends of the girders, ) To be fixed to the girder.

The lifting holes are formed so as to penetrate the girders at roughly intermediate heights of both ends of the girders 300. The lifting holes 310 are formed in the both sides of the girder 300 so that the horizontal fixing rods 320, A lower horizontal extending fixture 220 formed to contact the inner side surfaces of both sides of the girder from the lower end of the biasing inclined base, and a lower horizontal extending fixture 220 extending from the lower horizontal extending fixture 220 to the center of the girder, And a reinforcing bottom plate fixing unit 240 connecting between the inner horizontal fixing unit 230 and the bottom surface of the lower horizontal extension fixing unit 220.

2B and 2C, the bevel gear fixing base 210 is formed in the shape of a steel strip and has a through hole 211 formed on both sides of the end portion of the girder 300 so as to communicate with the lift hole 310 And extends downward from the lifting hole 310 toward the center of the girder and the other side extends to the lower end (flange side) of the girder.

The bevelled fixture 210 has a plurality of anchor holes formed on both sides of the girder so as to be fixed by the anchor bolts.

It can be seen that the shear fusing fixture 210 is installed to extend downward from both sides of both ends of the girder, while the other side is bent at the lower end of the girder and horizontally extended.

The lower horizontal extending fixture belt 220 is a steel strip bent on the lower side of the downwardly inclined fixing belt 210 so as to contact the inner side surfaces of both sides of the girder, And the other end is formed to extend toward the center of the girder.

It is important to adjust the horizontal extension length L of the lower horizontal extension fixture 220 so as to adjust the formation position of the inner horizontal fixture 230 to be described later. The inner horizontal fixing base 230 may fix the outer steel wire 100 after the tension because the fixing plate 250 is formed. Depending on the horizontal extending length L of the lower horizontal extending fixing base 220, It is possible to adjust the formation position of the inner horizontal fixing base 230 integrally formed at the other end of the fixing base 220 so that the outer steel wire 100 can be distributed and arranged.

That is, the inner horizontal fixing base 230 is integrally formed even though the stress distribution fixing port 200 is provided only at both ends of the girder, so that the outer steel wire 100 can be distributed and arranged.

It is preferable that the lower horizontal extending fixture 220 is formed with a plurality of anchor holes so as to be reliably fixed to the lower side surface of the girder with the anchor bolts.

A reinforcing bottom plate fixing belt 240 is formed between the lower surfaces of the lower horizontal extending fixing belt 220 to form the fixing plate 250.

That is, the fixing plate 250 may be installed while connecting the both inclined fixing belt 210 and the lower horizontal extending fixing belt 220 to each other to cover the lower portion of the girder so that the stress distribution fixing belt 200 can be installed. The reinforcement bottom plate fixture 240 is installed to secure a site.

Further, even if local stress is concentrated due to the tension and fixing of the outer steel wire to the fixing plate 250, the deformation of the fixing plate 222 is prevented from being directly transmitted to the both inclined fixing belt 210 and the lower horizontal extending fixing belt 220 .

The inner horizontal fixing base 230 is formed such that the inner side faces the opposite lateral sides of the girder 300 in the form of a rectangular plate at the other end thereof along the horizontal extending length L of the lower horizontal extending fixing base 220 An important point is that the fixing plate 250 can be formed on the side surface to be formed so as to be higher in height than the lower horizontally extending fixing base 220.

Since the inner horizontal fixing base 230 is spaced apart from the central portion of the girder 300 in comparison with the position of the reinforcing bottom fixing base 240 formed on the bottom of the lower horizontal extending fixing base 220, And the height of both side portions can be sufficiently secured so that the tension and fixing can be performed at the side of the girder.

In the present invention, the girder 300 is a reinforced concrete structure and is based on a PSC girder. However, the steel plate girder is also included in the present invention because the stress-dispersed fixture 200 of the present invention is a reinforcing means through introduction of a prestress.

The girders 300 are manufactured so that the lifting holes 310 are formed at both ends of the girders 300. The prestresses introduced when the girders 300 are used can be lost for various reasons over time.

This lost prestress can affect the safety of the girder so that the lost prestress is compensated for by tension and settlement after installation of the outer steel wire 100 of the present invention.

In this case, a conventional steel bar may be used as the outer steel wire 100. However, since it is difficult to work due to weight and the like, a PC strand having a large diameter may be used, but the cost and workability may also be deteriorated. A plurality of outer steel wires 100 are installed at both ends and both sides of the girder 300 using the outer steel wire 100 which is a PC stranded wire so as to be fixed after being strained.

For this fixing, the fixing plate 250 is installed in the stress distribution fixing port 200 as shown in FIGS. 3A to 3C.

That is, the bottom fixing plate 251 is installed on the reinforcing bottom plate fixing unit 240 or the inner horizontal fixing base 230 of the stress distribution fixing unit 200 in the form of a vertical plate spaced apart from each other, and the inner horizontal fixing base 230 Side fixing plate 252 in the form of a horizontal plate,

And the outer steel wire 100 is passed through the dispersed fixing plates, and is fixed after fixing by using a fixing nut.

The outer steel wire 100 can be dispersed and fixed to the bottom surface and the side surface fixing plates 251 and 252 disposed on the bottom or side surface of the girder 300. The outer steel wire 100 can be fixed to the inclined fixing belt 210, The fixing plate 250 including the inner horizontal fixing base 230 and the reinforcing bottom plate fixing base 240 and the bottom and side fixing plates 251 and 252 will be referred to as a stress distribution fixing fixture 200 in particular.

[Utilization of external steel wire and stress distribution anchorage]

FIGS. 3A, 3B and 3C illustrate an application example of the outer steel wire and the stress distribution fixing member of the present invention.

First, the structure is a girder 300. The outer steel wire 100 has a cap-type fixing hole 130 formed in advance at an end thereof, and the stress-dispersion fixing hole 200 is formed by an inclined fixing belt 210, A fixing plate 250 such as a bottom surface and side fixing plates 251 and 252 may be used as the fixing unit.

First, Fig. 3A is a side and bottom reinforcement type. That is, the outer steel wire 100 is installed on both the bottom side fixing plate 251 and the side side fixing plate 252 and is fixed after the tension so that the prestress is introduced together with the bottom face and the side face of the girder 300, 252 are spaced apart from both ends of the girder 300 toward the center, dispersion tension and fixation of the outer steel wire 100 are possible without installing a separate conventional bracket type fixing base, It is advantageous to reinforce the center portion of the girder.

Next, Fig. 3B is a bottom reinforcement type. The bottom fixing plate 252 is further provided on the bottom surface of the inner horizontal fixing base 230 constituting the stress dispersion fixing port 200 so as to be installed between the bottom fixing plates 252 provided on the bottom fixing base 240 The outer steel wire 100 and the outer steel wire 100 provided between the bottom fixing plate 252 on the bottom of the inner horizontal fixing base 230 are separated from each other to avoid the stress concentration and are also advantageous for reinforcing the center portion of the girder will be.

3C is a side reinforcing type. That is, the outer steel wire 100 installed between the side fusing plates 252 provided on the side of the inner side horizontal fusing unit 230 constituting the stress dispersion fusing fixture 200 and the side fusing installed on the lower horizontally extending fusing unit 220 The outer steel wires 100 provided between the plates 252 are separated so as to avoid the stress concentration and are also advantageous in reinforcing the center portion of the girder.

As a result, according to the present invention, it is possible to optimize the effect of introducing the prestress according to the state of the girders by adjusting the formation positions of the bottom and side fusing plates so as to disperse the outer steel wires 100 at desired positions.

For example, depending on the condition of the girder, it may not be easy to fix the outer steel wire to the bottom of the girder after the tension. In this case, the girder is reinforced by the side reinforcing type as shown in Fig. 3C, It is possible to maximize the effect of introducing the prestress dispersion by reinforcing the girder with the bottom reinforcing type and combining the side and bottom reinforcement as shown in FIG. 3B.

Accordingly, the stress-dispersed fixing fixture 200 according to the present invention can be installed in consideration of the reinforcement effect of the girder 300, if necessary, in a state where both the side and bottom fixing plates are installed, It is possible to avoid the labor of separately installing a plurality of the brackets on the girder as in the bracket type fixture, and to easily perform the tension and fixing operation of the outer steel wire, so that the efficiency and economical efficiency of the reinforcement of the structure can be ensured.

[Structural Reinforcement Method Using Stress Distributed Fixture and External Steel Wire]

4A and 4B are flowcharts of a structure reinforcing method using a stress distribution fixing port and an outer steel wire according to the present invention. The girder 300 as a structure is used as a structure, and a side surface and a bottom surface reinforcing type as shown in FIG. 200) is used as a reference.

First, as shown in FIG. 4A, a bridging bridge, which is a bridging substructure, alternately rests the girders 300 so that both ends of the girders 300 are supported.

It can be seen that a lifting hole 310 is formed at both ends of the girder 300. The horizontal fixing rods 320 are inserted into the lifting holes 310 of the girders 300 to provide the stress distribution fixing ports 200 of the present invention.

The stress distribution fixing unit 200 includes an inclined fixing unit 210, a lower horizontal extension fixing unit 220, an inner horizontal fixing unit 230 and a reinforcing bottom fixing unit 240. The reinforcing bottom fixing unit 240 And the side fixing plate 252 is formed on the inner side horizontal fixing base 230. In this case,

The anchor bolts may be inserted into the anchor holes of the stress distribution fixing slot 200 so that the stress distribution fixing slots 200 may be formed in the girders 300 Respectively.

It can be seen that the outer steel wire 100 can be dispersed on the side and bottom of the girder 300 by providing two stress distribution fixing ports 200 on both ends of the girder 300 .

Next, as shown in FIG. 4B, the outer steel wire 100 is positioned between the fixing plates so as to pass through the fixing holes of the fixing plate. The outer steel wires 100 may be provided between the bottom fixing plates and between the side fixing plates. Since the side fixing plates are provided on the side surfaces of the girders between the bottom fixing plates, they are advantageous for reinforcing the center portion of the girders, The stress concentration on the girder 300 can be prevented.

Since the outer steel wire 100 is provided with the cap-type fixing hole 130 in advance, the outer steel wire 100 can be easily installed on the fixing plates and then fixed to the fixing plate by tensioning the outer steel wire 100 using a jack device such as a hydraulic jack And fixed using a nut.

Thus, the structure reinforcing method using the stress-dispersed fixing fixture and the outer steel wire according to the present invention can be completed simply, and the girder can be quickly reinforced. If the re-tension is needed afterwards, the reinforcement can be re-tensioned using a jack device or the like, It is very advantageous for maintenance.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: outer liner
110: PC Strand 120: Cover material
130: cap-shaped fixture 131: end insertion hole
132: fixing nut 133: thread
200: Stress dispersion fixing fixture 210: Positive slope fixing fixture
220: Lower horizontal extension fixture
230: Inner horizontal settling zone 240: Reinforced bottom settled zone
250: Fixing plate 251: Bottom fixing plate
252: side fusing plate 300: girder
310: lifting hole 320: horizontal fixing rod

Claims (4)

Installing a girder (300) having lifting holes (310) at both ends thereof; Providing a stress distribution fixing port 200 in which the fixing plate 250 is formed in the lifting hole 310 so that the stress dispersion fixing port 200 surrounds both lower portions of the girder 300; And fixing the both ends of the outer steel wire 100 to the fixing plate 250 after the outer steel wires 100 are installed between the fixing plates 250 of the both stress distribution fixing ports 200 of the girders 300 ≪ / RTI >
The stress distribution fixing port 200 is formed with a through hole 211 through which the horizontal fixing rod 320 inserted into the lifting hole 310 can pass and one end of the stress releasing fixing port 200 is formed to extend from the lifting hole to both sides of the lower portion of the girder An inclined fixing belt 210; A lower-right horizontally elongated fusing belt 220 extending from the lower-end of the other side of the bi-directional fusing belt toward both sides of the girder so as to contact the inner side surfaces thereof; An inner horizontal fixing belt 230 formed at the other end of the both lower horizontally elongating fixing belt 220 so as to be in contact with both side surfaces of the girder and a bottom surface of the lower horizontal extending fixing belt 220, And a bottom plate fixture 240. The horizontal extension length L of the lower horizontal extension fixture 220 is adjusted so that the inner horizontal fixture 230 is stretched from the end of the girder toward the center, The fusing plate 250 is formed on the bottom surface of the bottom plate fixing plate 251 and the inner side fusing plate 230 formed on the bottom of the bottom plate fixing base 240, The outer steel wire 100 is inserted into each of the bottom fixing plate 251 and the side fixing plate 252 and is fixed after the tension so that the outer steel wire 100 And to be capable of being installed and dispersed at a position spaced apart from both ends Structure reinforcement method using a stress distribution anchorage and outer liners of the gong. The method according to claim 1,
The outer steel wire 100 is formed by using an unattached PC stranded wire so that a cap type fixing hole 130 is formed at an end of the outer steel wire 100. The cap type fixing hole 130 is formed with an end insertion hole 131 And a screw 133 is formed on the outer circumferential surface so that the fixing nut 132 can be fastened to the screw 133 so that the outer steel wire 100 is tightened by the fixing nut 132 and then fixed on the fixing plate 250. [ So as to be able to reinforce the structure. delete 3. The method according to claim 1 or 2,
The PSC girder or the steel plate girder is a PSC girder or a steel plate girder and is provided with stress distribution fixing ports 200 at both ends of the girder so that the outer steel wires are installed in the fixing plate 250 between the both stress dispersion fixing ports 200, ) Is located on the side or bottom of the girder so that it is fixed after the tension is applied.

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