KR102391522B1 - Outer steel wire fixing apparatus with double wedge anchorage and eccentricity adjustable saddle, and outer steel reinforcing method using the same - Google Patents

Abstract

Provided are an outer steel wire fixing device with a double wedge anchorage and an eccentricity adjusting saddle and an outer steel wire reinforcing method using the same. In an outer steel wire fixing device applied to a girder of a PSC bridge etc., immediate loss can be minimized using a one-way double wedge anchorage, thereby increasing the efficiency of tension. Moreover, the loosening of a wedge can be prevented using a one-way or two-way double wedge anchorage, and errors in construction caused by the eccentricity of a wedge can be prevented by the mechanical double fixation of a double wedge anchorage. The tremor of a strand can be reduced by reducing the free length of the strand depending on the adjustment of the eccentricity of a saddle. Moreover, damage can be prevented by combining and fixing the saddle to a girder fixing groove, and a strand guide part of the saddle can be arranged at multiple stages depending on the number of side surface strands and lower strands.

Description

An external steel wire anchoring device equipped with a double wedge anchorage and an eccentric adjustment saddle and a method for reinforcing an external steel wire using the same

The present invention relates to an external steel wire anchoring device, and more specifically, to prevent loosening of a stranded wire, a tension member, by a double wedge anchorage when reinforcing an external steel wire applied to a girder such as a PSC bridge, and to reduce the anchorage group activity. To minimize and improve the reinforcing power of the girder by adjusting the eccentricity by the eccentricity adjustment saddle, to an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle, and an external steel wire reinforcement method using the same.

In general, a bridge is configured such that a girder is mounted on a lower structure such as a pier or an abutment, and a floor plate is synthesized on the upper surface of the girder to allow vehicles or pedestrians to pass.

The load acting on the bridge includes both a fixed load and a live load from the passage of vehicles, and a compressive prestress is sometimes introduced under the neutral axis of the girder to improve the load-bearing capacity of the bridge.

When such a bridge is constructed and the shared state continues, the compressive stress introduced into the concrete may be lost due to creep or drying shrinkage of the concrete. occurs

Accordingly, when a certain amount of time has elapsed after the construction of the bridge, a reinforcement process of additionally introducing a compressive prestress to the girder of the bridge is required in order to restore the load-bearing force.

Since the load-bearing capacity of the concrete structure of such a bridge is determined by how much more it can resist live or fixed load, it can be said that a concrete structure that can apply a large amount of live or fixed load has a large load-bearing capacity.

For example, a concrete structure such as a bridge girder or a slab made of reinforced concrete has a very large fixed load, so the cross-sectional size, etc. must be determined to have a load-bearing capacity that can effectively resist not only the fixed load but also the live load.

However, since the deterioration of the concrete structure over time is unavoidable after the actual bridge is built, a number of methods for reinforcing the concrete structure have been introduced.

For example, there are steel plate bonding method, epoxy panel bonding method, cross-section increase method, member extension method, external steel wire reinforcement method, etc.

Specifically, the steel plate bonding method has excellent structural reinforcing effects because reinforcing bars and reinforcing plates used in existing bridges have similar material properties in terms of elastic modulus, etc. In the case of repeated action, there is a problem in that the concrete structure and the attached surface are highly likely to be detached.

In addition, the steel plate adhesive injection method has a problem that the reinforcement effect is very insufficient when a lot of cracks and sags occur in the concrete structure of the existing bridge.

In addition, the epoxy panel bonding method is a method similar to the steel plate bonding method, and the epoxy panel is placed on the surface of the concrete structure and then attached to the surface of the concrete structure with an epoxy resin. is decided Therefore, when the concrete surface of the concrete structure is corroded due to weathering or the like, the adhesion strength is not sufficient. In addition, when an extreme load is applied, peeling occurs on the concrete surface, which can lead to adhesion failure.

This is very dangerous because it is a result contrary to the purpose of minimizing human life and economic damage by inducing ductile failure.

In addition, since the cross-section increase method and the member extension method additionally increase the fixed load on the concrete structure, if the increased load is large, the lower structure such as a column or pier must be increased by the amount of increase in the load, so additional costs occur. .

After all, most of the concrete structure reinforcement methods according to the prior art do not significantly deviate from the level of reinforcing the concrete structure as a temporary measure, and since they do not sufficiently satisfy various on-site conditions, it is difficult for even a skilled person to completely construct a concrete structure. There was a difficult problem.

In addition, when the safety check and precision diagnosis results for the concrete structures repaired and reinforced according to the prior art are checked, it is known that the repair and reinforcement effects of the actual concrete structures are insufficient.

On the other hand, although the external steel wire reinforcement method is the most used as a reinforcement method for reinforcing a concrete structure, in the case of the existing external steel wire reinforcement method, it is difficult to arrange the steel wire, it is necessary to install a central saddle, and the installation of anchorage is insufficient. Damage to the structure may occur, and safety during use was insufficient, and since the wedge-type method, which is difficult to re-tension and maintain in the future, is used, there is a problem that re-tension of the external steel wire is not easy.

Specifically, a concrete structure such as a concrete girder or a concrete beam of a continuous bridge is reinforced by introducing post tension.

As a method of introducing post-tension to such a concrete structure, after placing a tension member on the outside of the concrete structure, the tension member is tensioned using hydraulic pressure, and then, the tension member is introduced into the concrete structure by the tension of the tension member by fixing the tension member. The external post tension method is widely used.

At this time, in order to apply the external post-tensioning method, a separate bracket is installed on the outer side of the concrete structure, and after the tension member is placed, a tension force is applied at the end of the tension member to tension the tension member, and the method of fixing the tension member to the bracket is used. do.

For example, as shown in Fig. 1, by introducing tensile force at both ends and in the middle of the concrete girder of the bridge at the same time, the concentration of local stress occurring in the anchorage of the concrete girder is solved, and sagging and cracking in the center part are effectively prevented A method for reinforcing an external tension member of a bridge beam using a multi-step fixing device is disclosed.

1 is a view showing a bridge girder for introducing a prestress using an external tension member according to the prior art.

Referring to Figure 1, the bridge girder for introducing the prestress using an external tension member according to the prior art,

The end fixing plate 21a is formed with both ends bent upward as if enclosing the lower part of the concrete girder 12, and fixed with anchor bolts to the lower side of both ends of the concrete girder 12 of the bridge 11 and the lower side of both sides;

a pair of end fixing devices 21 provided with fixing holes respectively formed on the lower side and both sides of the end fixing plate 21a;

Both ends are bent upward as if enclosing the lower part of the concrete girder 12, and fixed with anchor bolts at the lower part of the two points in the middle of the concrete girder 12 of the bridge 11 located between the end anchoring devices 21 and at the lower part of both sides. a pair of intermediate fixing devices 22 provided with an intermediate fixing plate and automatic fixing holes respectively formed on the lower side and both sides of the intermediate fixing plate; and

Tensile members disposed below the concrete girder 12 of the bridge 11 and fixed at both ends to the end anchoring device 21 in a tension state, respectively, are disposed on both sides of the lower side of the concrete girder 12 of the bridge 11 in a tension state A tension member having both ends fixed to the end anchoring device 21, respectively, a tension member disposed below the concrete girder 12 of the bridge 11 and fixed in tension to the intermediate anchoring device 22 in a tension state, the lower part of the bridge 11 It is composed of a plurality of external tension members 23 that are disposed on both sides and are made of tension members respectively tensioned and fixed to the intermediate fixing device 22 in a tension state.

As such, in the case of a bridge girder in which prestress is introduced using an external tension member according to the prior art, the reinforcing effect at the central point is very excellent by introducing the compressive force and bending moment due to the tension of the external tension member 23 in multiple steps. , it is possible to effectively prevent the local stress concentration phenomenon occurring at both ends of the bridge.

However, in order to install the external tension member 23, it is necessary to install the end fixing device 21 and the intermediate fixing device 22 at both ends of the girder and in the middle between the both ends, respectively. (12) Since the work is done from the bottom, it is not easy to secure a work space,

In particular, in the case of a long span girder with a long extension length of the concrete girder 12, as the installation work of the end fixing device 21 and the intermediate fixing device 22 is repeated, the workability is inevitably deteriorated, and thus economic efficiency is reduced. There was a problem that there was no choice but to fall.

In addition, the external tension member 23 uses a tension member such as a non-attached stranded wire, and since it has to be fixed after being tensioned on the fixing member, the decrease in workability is inevitably very large. ) must be installed from the lower part of the concrete girder 12, so the problem of workability deterioration has always arisen.

In order to solve the problem of the bridge girder that introduces prestress using the above-described external tension member, a structure reinforcement method using a stress distribution anchorage and an external steel wire is disclosed, which will be described with reference to FIG. 2 .

2 is a view for explaining a structure reinforcement method using a stress distribution anchorage and an external steel wire according to the prior art.

Referring to FIG. 2 , in the structure reinforcement method using the stress-dispersing anchorage and the external steel wire according to the prior art, the external steel wire 40 is positioned between the anchoring plates to penetrate the anchoring hole of the anchoring plate.

The external steel wire 40 may be installed between the bottom anchoring plates and between the side anchoring plates, respectively, since the side anchoring plates are installed on the side of the concrete girder 30 between the bottom anchoring plates, the concrete girder 30 It is advantageous for reinforcing the central part of the structure, and since the fixing part is dispersed, it is possible to prevent excessive stress concentration on the concrete girder (30).

In addition, since the cap-type anchorage is installed in the external steel wire 40 in advance, it is simply installed on the fixing plates and tensioned the external steel wire 40 using a jack device such as a hydraulic jack, and then fixed using a fixing nut on the fixing plate. will make it

The structural reinforcement method using the stress distribution anchorage and external steel wire according to the prior art can be completed simply, enabling rapid reinforcement of the girder. It is also very advantageous for maintenance by fixing it using

However, in the case of the external steel wire reinforcement method according to the prior art, the installed anchorage is not strong, and there is a risk that the anchorage may be dropped from a concrete structure, for example, a concrete girder or a concrete beam, and the concrete structure may collapse, The reinforcing effect is insufficient because the arrangement of the steel wire is not effective, and in particular, the external steel wire reinforcement method is not applied in the case of a continuous bridge.

In addition, in the case of the external steel wire reinforcement method according to the prior art, cracks and sags occur due to deterioration of the concrete structure or the occurrence of relaxation of the external steel wire over time. will do

At this time, since it is necessary to re-tension by the amount of tension loss after mounting the hydraulic jack and checking the hydraulic jack gauge, there is a problem that maintenance and reinforcement are inconvenient and economic loss may occur.

On the other hand, as a prior art, Korean Patent Registration No. 10-1766213 discloses an invention entitled "a monotendon fixing device using a saddle part and a construction method therefor", which will be described with reference to FIGS. 3A and 3B.

3A is a front view and an end excerpt of a girder in which a monotendon fixing device using a saddle part according to the related art is installed, and FIG.

As shown in FIG. 3A, the saddle part 70 is provided with a plurality of tension member guide parts 72 positioned on the girder 60 constituting the bridge to guide the plurality of tension members 81 in a bundle form, and a plurality of The monotendon fixing device 80 tensions both ends of the tension member 81 passing through the tension member guide part 72 , and is vertically arranged and fixed to the side of the girder 60 .

First, as shown in FIG. 3A , the girder 60 is a bridge structure in which the lower surface of the girder 60 is mounted on the upper surface of the pier or abutment through the bridge bearing, and the slab forming the bridge upper plate on the upper surface of the girder 60 . (61) is formed.

That is, a plurality of girders 60 are arranged on the bottom surface of the slab 61 in the crossing direction of the slab 61 and installed along the bridge longitudinal direction.

At this time, the tension member 81, as shown in FIG. 3a, is to provide tension in the longitudinal direction to the girder 60, refers to a wire made of a metal material, and a plurality of wires are bundled to form one tension member, and HDPE covered with material.

This saddle part 70 guides the tension material 81 to be positioned on the bottom surface of the central part of the girder 60, and the monotendon fixing device 80 serves to fix both ends after tensioning the both ends of the girder 60, etc. do

That is, a plurality of tension members 81 pass through the tension member guide part 72 of the saddle part 70, and both ends of the girder 60 by the monotendon fixing device 80 arranged in plurality at both ends. The sides are individually strained and then settled.

At this time, the saddle part 70 may be integrally installed on the bottom surface of the girder 60 with a metal material, and is installed to extend in a direction perpendicular to the bridge axis with respect to the longitudinal direction of the girder 60 constituting the bridge.

Specifically, it can be seen that the saddle part 70 is provided with a tension material guide part 72 to guide the tension material in the longitudinal direction, as shown in FIG. 3b .

The position of this tension member guide part 72 is, the tension member 81 passing through the tension member guide part 72 is the width of the girder 60 from the bottom surface of the girder 60 so that it can be deployed to both sides of the girder 60. installed in a more extended position.

When the monotendon fixing device 80 according to the prior art is disposed on both end sides of the girder 60 , the tension member 81 fixed to the monotendon fixing device 80 after both ends are tensioned is the girder 60 . Since it is located on both sides of the side of the girder in the central part, this is because the tension member guide part 72 must be set according to the position of the tension member 81 in order to guide it.

In addition, the saddle part 70, as shown in FIG. 3b, is configured to include a transverse beam 71 and a tension member guide part 72, at this time, the transverse beam 71 is the girder 60 of As a beam extending transversely to the bottom surface, an I-shaped steel beam may be used. Accordingly, the transverse beam 71 is installed so as to protrude to both sides of the girder (60).

In addition, the tension member guide part 72 is formed in the abdomen so that the tension member 81 is guided, and one tension member 81 is installed in this monotendon fixing device 80, and a plurality of tension members 81 are provided in the saddle part. (70) is disposed to penetrate the tension member guide portion (72).

This tension member guide portion 72 is configured to include a longitudinal pipe (72a), an end cap (72c) and a filler (72e). First, the longitudinal pipe (72a) is formed in a circular pipe, the tension member 81 is penetrated inside, and the end caps (72c) are fitted to both ends of the longitudinal pipe (72a) and fixed, respectively. At this time, a plurality of tension material passing holes 72b are formed in the end cap 72c, so that the tension material passes through the longitudinal pipe 72a via the tension material passage hole 72b, and the position is determined by the tension material passage hole 72b. be guided

At this time, the filling material 72e filled inside the longitudinal tube is filled so that the strand tube 72d installed to connect the tension material passage hole 72b of the end cap 72c to each other is buried, and the tension material 81 in the strand tube 72d. ) is installed to pass through.

In addition, a plurality of monotendon fixing devices 80 according to the prior art are vertically arranged on both end sides of the girder 60 of the bridge, and both ends of the plurality of tension members 81 through the tension member guide part 72, respectively It is fixed to the girder 60 in a tension state.

In this way, the monotendon fixing device 80 fixed after the tension member 81 is tensioned is advantageous for bending reinforcement of the girder 60, and is arranged in a parabolic shape on the girder 60, by the saddle part 70, the girder ( 60) is arranged in a parabolic shape via both ends and the lower part of the central part.

In the case of the monotendon fixing device 80 according to the prior art, when it is installed using the saddle part 70, it is very advantageous in arranging the tension member in parallel at the center of the girder 60, and the monotendon fixing device 80 By this, the angle of inclination of both ends of the tension member can be adjusted, respectively, so that the reinforcement of the girder 60 is effective.

According to the monotendon fixing device using the saddle part according to the prior art, each tension member end extending to both ends of the girder through the tension member guide part constituting the saddle part installed on the bottom surface of the girder forming the bridge is attached to the mono anchorage installed on the side of the girder. By fixing it, not only stable fixation of the tension member but also individual tension of the tension member is possible, so the installation angle of the tension member can be easily adjusted.

In addition, the prestress introduction efficiency can be improved by installing each tension member, but the saddle part can be arranged by interim fixing integrally in parallel to the lower part of the girder.

However, in the case of the monotendon fixing device using the saddle part according to the prior art, if the tension member is installed using the saddle part, the tension member may be arranged in parallel at the center of the girder, but damage to the tension member may occur when the saddle part is installed. Damage may occur due to contact between the tension member and the tension member, and the vibration of the tension member may increase as the free length of the tension member decreases.

On the other hand, according to the prior art, in the external steel wire fixing device, loosening and tension loss of the strand may occur according to the fluctuation of the strand. there is.

In addition, when additional reinforcement of the girder is required, the economic feasibility of additional reinforcement is low by re-tensioning after replacement of the external steel wire anchorage device or the replacement of the strand. As a result, there is an aesthetic problem.

Republic of Korea Patent No. 10-0426611 (Registration Date: March 29, 2004), Title of Invention: "Connecting Device for Reinforcing External Steel Wires of Bridges" Republic of Korea Patent No. 10-1354466 (Registration Date: January 16, 2014), Title of Invention: "Permanent Anchor Structure Expanded by Double Wedges" Republic of Korea Patent No. 10-1334750 (Registration Date: November 25, 2013), Title of Invention: "A cable fixing device with increased fastening force using double wedges opposite to each other and a fixed type equipped with this cable fixing device cable anchorage" Republic of Korea Patent No. 10-1766213 (registration date: August 2, 2017), title of invention: "Monotendon fixing device using saddle and its construction method" Republic of Korea Patent No. 10-1994875 (Registration Date: June 25, 2019), Title of Invention: "Anchor for preventing corrosion of stranded wire" Republic of Korea Patent No. 10-1223221 (registration date: January 10, 2013), title of invention: "two-way cable anchorage"

The technical problem to be achieved by the present invention for solving the above-mentioned problems is that by using a one-way double wedge anchorage in an external steel wire anchoring device applied to a girder such as a PSC bridge, the instantaneous loss can be minimized to increase the tension efficiency, double An object of the present invention is to provide an external steel wire anchoring device having a wedge anchorage and an eccentric adjustment saddle, and an external steel wire reinforcement method using the same.

Another technical problem to be achieved by the present invention is that it is possible to prevent the loosening of the wedge by using a one-way or two-way double wedge anchorage, and the mechanical double anchoring of the double wedge anchorage can prevent construction errors due to the deflection of the wedge, double An object of the present invention is to provide an external steel wire anchoring device having a wedge anchorage and an eccentric adjustment saddle, and an external steel wire reinforcement method using the same.

Another technical problem to be achieved by the present invention is to improve the reinforcing force of the girder through eccentric control of the saddles during maintenance of the girder, and to reduce the vibration of the strand by reducing the free length of the strand according to the eccentricity of the saddles. It is to provide an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle that can be reduced, and an external steel wire reinforcement method using the same.

As a means for achieving the above-described technical problem, an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to the present invention is installed at both ends and lower portions of a bridge girder to fix the side strands and the lower strands. A steel wire anchoring device comprising: side anchoring ends respectively installed at both ends of the bridge girder to fix the side stranded wires along both sides of the bridge girder; lower fixing ends installed at both lower ends of the girder for the bridge to fix the lower strand along the lower surface of the girder for the bridge; At least one saddle installed on the outer side and lower side of both sides of the bridge girder to adjust the eccentric height, and to guide the side strands and the lower strands while being mounted;
The saddle consists of an outer saddle installed on the outside of both sides of the girder for the bridge and an inner saddle installed in a plurality on the lower bottom of the girder for the bridge, and the outer saddle is the side strand and the lower strand are mounted at the same time The saddle is formed in two stages to be guided, and the inner saddle is a saddle formed in one stage so that the lower strand is mounted and guided,
The saddle, a first plate installed to be in close contact with the lower part of the girder for the bridge; a second plate installed to be spaced apart from the first plate to adjust eccentricity; computerized bolts installed to pass through the first and second plates; a computational nut fastened to the computational bolt; a third plate installed under the second plate so that the computational bolt extends through; and a fourth plate spaced apart from the third plate to guide the side strand or the lower strand, wherein the eccentric height is adjusted between the first plate and the second plate, and between the third plate and the third plate It is characterized in that the side strand or the lower strand is mounted and guided.

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On the other hand, as another means for achieving the above-mentioned technical problem, the external steel wire reinforcement method using the external steel wire anchoring device equipped with the double wedge anchorage and the eccentric adjustment saddle according to the present invention is installed at both ends and the lower part of the bridge girder. In the external steel wire reinforcement method using an external steel wire anchoring device for fixing side strands and lower strands, a) installing side anchoring ends at both ends of a girder for a bridge requiring reinforcement, and in the width direction of the girder at both ends of the bridge girder Installing a lower anchorage stage; b) installing at least one saddle under the girder for the bridge to correspond to the lower anchorage end; c) penetrating or anchoring the side strands and the lower strands to the saddle using a double wedge anchorage for a saddle; d) introducing tension to the side strands fixed to the side anchoring ends, and fixing the side strands to the side anchoring ends with a double wedge anchorage for the anchoring end; e) introducing tension to the lower strands fixed to the lower anchorage end and fixing each of the lower strands to the lower anchorage end with a double wedge for the anchorage end; And f) comprising the step of adjusting the eccentric height of the saddle installed in the lower portion of the girder for the bridge, wherein the saddle in step b) is an outer saddle installed on the outside of both sides of the girder for the bridge and the girder for the bridge It consists of a plurality of inner saddles installed on the lower bottom of Birds formed in one tier,
The saddle, a first plate installed to be in close contact with the lower part of the girder for the bridge; a second plate installed to be spaced apart from the first plate to adjust eccentricity; computerized bolts installed to pass through the first and second plates; a computational nut fastened to the computational bolt; a third plate installed under the second plate so that the computational bolt extends through; and a fourth plate spaced apart from the third plate to guide the side strand or the lower strand, wherein the eccentric height is adjusted between the first plate and the second plate, and between the third plate and the third plate It is characterized in that the side strand or the lower strand is mounted and guided.

According to the present invention, it is possible to increase the tension efficiency by minimizing the instantaneous loss by using the one-way double wedge anchorage in the external steel wire anchoring device applied to the girder of the PSC bridge, etc. Tension efficiency can be increased by using a double wedge anchor that can be reduced from 6 mm to within 3 mm.

According to the present invention, it is possible to prevent wedge loosening by using a one-way or two-way double wedge anchorage, and construction errors due to the deflection of the wedge can be prevented by mechanical double anchoring of the double wedge anchorage.

According to the present invention, the reinforcing force of the girder can be improved by adjusting the eccentricity of the saddles during maintenance of the girder, and the vibration of the strand can be reduced by reducing the free length of the strand according to the eccentricity of the saddles.

According to the present invention, damage can be prevented by coupling and fixing the saddle to the girder fixing groove, and the strand guide part of the saddle can be arranged in multiple stages according to the number of side strands and lower strands.

According to the present invention, it is possible to prevent damage to the contact portion between the saddle and the stranded wire when adjusting the eccentricity, and to easily construct the stranded wire.

According to the present invention, by installing a chemical hardening material in the double wedge, it is possible to reduce the amount of activity of the anchorage, thereby preventing loosening and corrosion of the stranded wire.

According to the present invention, corrosion inside the double wedge anchorage can be prevented by injecting grease lubricating oil through the oil injection hole formed in the middle of the double wedge anchorage.

1 is a view showing a bridge girder for introducing a prestress using an external tension member according to the prior art.
2 is a view for explaining a structure reinforcement method using a stress distribution anchorage and an external steel wire according to the prior art.
3A is a front view and an end excerpt of a girder in which a monotendon fixing device using a saddle part according to the related art is installed, and FIG.
4 is a bottom view and a side view showing a girder for a bridge in which an external steel wire anchoring device equipped with a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention is installed.
5 is a view specifically showing that the double wedge anchorage for the anchorage end is coupled to the side anchorage end and the lower anchorage end in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
6 is a photograph illustrating a double wedge anchorage for the anchorage end in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
7 is a photograph illustrating coupling of the double wedge anchorage for the anchorage end to the anchorage end in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
8 is a view specifically showing that the double wedge anchorage for saddles is coupled to the saddle in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
Figure 9a shows that in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, a penetrating two-way double wedge anchorage is installed on the saddle, 9c is a view showing that the one-way double wedge anchorage is installed on the saddle.
10a is a front view showing that the double wedge anchorage for the saddle is installed in one stage in the external steel wire anchoring device having the double wedge anchorage and the eccentric adjustment saddle according to the embodiment of the present invention, and FIG. 10b is the double wedge anchorage for the saddle 2 It is a front view showing the one-piece installation.
11 is a bottom view showing that the double wedge anchorage for the saddle is installed in the saddle in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
12 is a view for explaining the operation of the double wedge anchorage for saddle in the external steel wire anchoring device having a double wedge anchorage and eccentric adjustment saddle according to an embodiment of the present invention.
13 is a photograph illustrating a double wedge anchorage for saddles in an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
14 is a photograph showing that the saddle is installed in the lower part of the girder to which the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention is applied to adjust the eccentric height.
15 is a view showing that a cylindrical chemical hardener is installed in the double wedge anchorage in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
16 is an operation flowchart illustrating a method for reinforcing an external steel wire using an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.
17A to 17F are side views for specifically explaining a method of reinforcing an external steel wire using an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle, respectively, according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

[External steel wire anchoring device 100 equipped with double wedge anchorage and eccentric adjustment saddle]

4 is a bottom view and a side view showing a girder for a bridge installed with an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention;

4 a) is a bottom view,

4 b) is a side view showing that one saddle is installed on the lower side of the girder,

4 c) is a side view showing that two saddles are installed on the lower side of the girder,

4 d) is a side view showing that three saddles are installed on the lower side of the girder, and each saddle may be installed in plurality at predetermined intervals from the lower bottom of the girder in the width direction of the girder.

4 a) to d), the external steel wire fixing device 100 having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention,

As an external steel wire anchoring device installed at both ends and lower portions of the bridge girder 110 to fix the side stranded wires 170a and the lower stranded wires 170b, the first and second side anchoring ends 120, 140, the first and second It includes a lower anchorage end (130, 150), a saddle (160), a double wedge anchorage for the anchorage end 180, and a double wedge anchorage for the saddle (190).

At this time, the side strands 170a are respectively installed on the side surfaces of the bridge girder 110 of the PSC bridge, for example, as shown in FIG. 4 b),

As shown in a) of FIG. 4, the lower strand 170b may be installed in multiple numbers at predetermined intervals on the lower bottom surface of the bridge girder 110,

In particular, it can be seen that the side strand 170a and the lower strand 170b are mounted at the same time as shown in FIG. 4 a) under the longitudinal side of the girder 110 for the bridge.

The first and second side anchoring ends 120 and 140 are composed of a first side anchoring end 120 and a second side anchoring end 140 installed at both ends of the bridge girder 110, and the bridge girder The side strands 170a are fixed to the first side anchoring end 120 and the second side anchoring end 140 along both sides of 110 .

The first and second lower anchoring ends 130 and 150 are, as shown in FIG. 4 b), a plurality of first lower anchoring ends 130 and a first lower anchoring end 130 and a plurality of first lower anchoring ends 130 installed at both lower ends of the bridge girder 110, respectively. It consists of two lower anchoring ends 150, and fixing the lower strands 170b along the lower surface of the bridge girder 110 to the first lower anchoring end 130 and the second lower anchoring end 150. make it

Specifically, the first lower anchorage end 130 is, as shown in FIG. 4 a), an outer first lower anchorage end 130a installed on the outside of the side surfaces of both ends of the bridge girder 110 and It consists of a plurality of inner first lower fixing ends 130b installed at predetermined intervals on the lower bottom surfaces of both ends of the bridge girder 110,

Similarly, the second lower anchorage end 150 is, as shown in Fig. 4a), the outer second lower anchorage end 150a and the bridge installed on the outside of both sides of the girder 110 for the bridge It consists of a plurality of inner second lower fixing end (150b) installed on the lower bottom of the girder (110).

The saddle 160 adjusts the eccentric height, and at least one is installed on the outside and the bottom of both sides of the bridge girder 110 so that the side strands 170a and the lower strands 170b are mounted and guided. .

Here, the saddle 160 is composed of an outer saddle installed on the outside of both sides of the bridge girder 110 and an inner saddle installed in a plurality on the lower bottom surface of the bridge girder 110,

The outer saddle is a saddle formed in two stages so that the side strand 170a and the lower strand 170b are mounted and guided at the same time,

The inner saddle may be a saddle formed in one stage so that the lower stranded wire 170b is mounted and guided. That is, the saddle 160 is formed to adjust the eccentric height, which will be described in detail later with reference to FIGS. 8 to 14 .

The double wedge anchorage for the anchoring end 180 fixes the side strands 170a to the first and second side anchoring ends 120 and 140, and the lower strands 170b to the first and second lower anchoring ends 130 and 150. ) as a double wedge-shaped anchor for fixing, preventing loosening of the side strands 170a and the lower strands 170b.

The double wedge anchorage 190 for the saddle is installed on the saddle 160 to penetrate or fix the side strand 170a and the lower strand 170b, respectively, as a double wedge type anchorage, the side strand 170a and It prevents loosening of the lower stranded wire 170b.

At this time, the double wedge anchorage 190 for the saddle, as will be described later, may be a through-type two-way double wedge anchorage 190a, a fixation-type two-way double wedge anchorage 190b or a through-type one-way double wedge anchorage 190c. .

On the other hand, Figure 5 is a view specifically showing that the double wedge anchorage for the anchorage end is coupled to the side anchorage end and the lower anchorage end in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.

As shown in FIG. 5, in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, the side strands 170a are removed using the double wedge anchorage 180 for the anchorage end. The one side anchoring end 120 may be fixed, and the lower stranded wire 170b may be fixed to the first lower anchoring end 130 by using the double wedge anchoring hole 180 for the anchoring end.

In this case, the double wedge anchorage for the anchorage end 180 is a through-type one-way double wedge anchorage, the first socket 181 , the first wedge 182 , the first elastic member 183 , the second socket 184 , and the second 3 The socket 185, the second wedge 186 and the second elastic member 187 may include, but are not limited thereto, and the first wedge 182 and the second wedge 186 are each in one direction. is installed

Specifically, the first socket 181 of the double wedge anchorage unit 180 for the anchorage end passes through the side strand 170a or the lower strand 170b, and the first wedge 182 is the side strand 170a or It is inserted between the side strand 170a or the lower strand 170b and the first socket 181 so that the lower strand 170b is fixed, and the first elastic member 183 is the rear end of the first wedge 182. It may be a spring installed in the first wedge 182 to provide elasticity.

The second socket 184 is coupled to the first socket 181 so that the side strand 170a or the lower strand 170b passes through, and a grease lubricant for preventing corrosion on the outer peripheral surface of the second socket 184 . A lubricating oil injection hole into which is injected may be formed.

The third socket 185 is coupled to the second socket 184 so that the side strand 170a or the lower strand 170b passes through,

The second wedge 186 is installed in one direction with the first wedge 182 to form a double wedge, and the side strand 170a or lower strand (170a) or the lower strand (170b) is fixed so that the side strand (170a) or the lower strand (170b) is fixed. It is inserted between 170b) and the third socket 185,

The second elastic member 187 may be a spring installed at the rear end of the second wedge 186 to provide elasticity to the second wedge 186 .

On the other hand, Figure 6 is a photograph illustrating a double wedge anchorage for the anchoring end in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, Figure 7 is a double wedge according to an embodiment of the present invention It is a photograph illustrating the coupling of the double wedge anchorage for the anchorage end to the anchorage end in the external steel wire anchoring device equipped with the anchorage and the eccentric adjustment saddle.

6 a) shows the outer shape and a half cross-section of the double wedge anchorage for the anchorage end,

Figure 6b) shows the disassembled double wedge anchorage for the anchorage end, respectively.

In addition, a) of FIG. 7 illustrates that the double wedge anchorage 180 for the anchorage end is a one-way double wedge anchorage in which the lower stranded wire 170b is fixed to the first lower anchorage end 130,

7 b) shows that the lower stranded wire 170b is fixed to the first lower anchorage end 130 using the double wedge anchorage 180 for the anchorage end, so that the amount of anchorage activity according to the movement when the anchorage is installed can be measured. indicates.

On the other hand, Figure 8 is a view specifically showing that the double wedge anchorage for saddles is coupled to the saddle in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.

As shown in Figure 8, in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention,

The saddle 160 is divided into an eccentricity adjustment unit and a strand guide region, for example, a first plate 161, a second plate 162, a computerized bolt 163, a computerized nut 164, and a third plate 165. ) and a fourth plate 166 .

The first plate 161 is installed to be in close contact with the lower portion of the girder 110 for the bridge, and the second plate 162 is installed to be spaced apart from the first plate 161 to adjust the eccentricity, and the first plate ( Between 161) and the second plate 162, the eccentric height is adjusted using, for example, a hydraulic jack.

The computational bolt 163 is installed to penetrate the first and second plates 161 and 162 , and the computational nut 164 is fastened to the computational bolt 163 .

The third plate 165 is installed under the second plate 162 so that the computer bolt 163 extends through it,

The fourth plate 166 is installed to be spaced apart from the third plate 165 to guide the side strands 170a or the lower strands 170b,

The side strand 170a or the lower strand 170b is mounted and guided between the third plate 165 and the fourth plate 166 .

In addition, the double wedge anchorage 190 for the saddle, the first socket 191, the first wedge 192, the first elastic member 193, the second socket 194, the third socket 195, the second It consists of two wedges 196 and a second elastic member 197, and the first wedge 192 and the second wedge 196 may be installed in one direction or in both directions.

Specifically, in the first socket 191 of the double wedge anchorage 190 for the saddle, the side strand (170a) or the lower strand (170b) passes through,

The first wedge 192 is inserted between the side strand 170a or the lower strand 170b and the first socket 191 so that the side strand 170a or the lower strand 170b passes through,

The first elastic member 193 is installed at the rear end of the first wedge 192 to provide elasticity to the first wedge 192 .

The second socket 194 is coupled to the first socket 191 so that the side strand 170a or the lower strand 170b penetrates or settles therein.

The third socket 195 is coupled to the second socket 194 so that the side strand 170a or the lower strand 170b passes through,

The second wedge 196 is installed in one or both directions with the first wedge 192 to form a double wedge, and the side strand 170a or the lower strand so that the side strand 170a or the lower strand 170b is fixed. It is inserted between the stranded wire 170b and the third socket 195,

The second elastic member 197 is installed at the rear end of the second wedge 196 to provide elasticity to the second wedge 196 .

In addition, as shown in FIG. 13 to be described later, at least one lubricant injection hole ( 198) can be formed.

On the other hand, Figure 9a shows that in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, a penetrating two-way double wedge anchorage is installed in the saddle, and Figure 9b is It shows that it is installed on the saddle, and Figure 9c is a view showing that the one-way double wedge anchorage is installed on the saddle.

The double wedge anchorage for the saddle, as shown in FIG. 9a, may be a through-type bidirectional double wedge anchorage (190a), and the strand may be installed in both directions through the double wedge.

In addition, the double wedge anchorage for the saddle, as shown in FIG. 9b , may be a fixed two-way double wedge anchorage (190b), wherein one end of the strand is fixed to one end of the double wedge, and the other end of the strand is the It can be anchored to either the side anchorage end or the lower anchorage end.

In addition, the double wedge anchorage for the saddle, as shown in FIG. 9c , may be a through-type one-way double wedge anchorage 190c, and the strand may be installed in one direction through the double wedge.

On the other hand, Figure 10a is a front view showing that the double wedge anchorage for the saddle is installed in one stage in the external steel wire anchoring device having the double wedge anchorage and the eccentric adjustment saddle according to the embodiment of the present invention, Figure 10b is the double wedge anchorage for the saddle It is a front view showing that it is installed in two stages.

As shown in Figure 10a, the double wedge anchorage for the saddle may be installed in one stage so that the lower stranded wire 170b can be fixed to the inner saddle installed on the lower bottom surface of the girder 110 for the bridge.

In addition, as shown in Fig. 10b, the double wedge anchorage for the saddle is divided into two stages so that the side strands 170a and the lower strands 170b can be respectively fixed to the outer saddles installed outside the lower side of the girder 110 for the bridge. can be installed.

That is, the saddle 160 is composed of an outer saddle installed on the outside of both sides of the bridge girder 110 and an inner saddle installed on the lower bottom surface of the bridge girder 110, and the outer saddle is The side strand (170a) and the lower strand (170b) are mounted and guided at the same time as a saddle formed in two stages, and the inner saddle is a saddle formed in one stage so that the lower strand (170b) is mounted and guided. there is.

On the other hand, Figure 11 is a bottom view showing that the double wedge anchorage for the saddle is installed in the saddle in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.

In the case of an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, as shown in FIG. 11 ,

The saddle 160 is composed of an outer saddle installed on the outside of both sides of the bridge girder 110 and an inner saddle installed in a plurality on the lower bottom surface of the bridge girder 110, and the outer saddle is the side strand. 170a and the lower strand 170b are mounted and guided at the same time, and the inner saddle is guided while the lower strand 170b is mounted, and in this case, the saddle 160 can adjust the eccentric height.

In addition, damage can be prevented by coupling and fixing the saddle 160 to the fixing groove formed on the side or lower bottom surface of the girder 110 for the bridge, and also, the strand guide of the saddle according to the number of side strands and lower strands It can be arranged in multiple tiers.

On the other hand, Figure 12 is a view for explaining the operation of the double wedge anchorage for the saddle in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention,

12 a) shows the double wedge anchorage for the saddle through-type two-way double wedge anchorage (190a),

Figure 12 b) shows a double-wedge anchorage for saddles and a two-way double-wedge anchorage (190b) of the anchoring type,

Figure 12 c) shows the double wedge anchorage for the saddle through-type one-way double wedge anchorage (190c),

13 is a photograph illustrating a double wedge anchorage for saddles in an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.

In the case of an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, as shown in a) to c) of FIG. 12, respectively, the double wedge anchorage for the saddle is a penetrating double-sided double wedge Any one of the anchorage (190a), the anchorage-type two-way double wedge anchorage (190b) or the through-type one-way double wedge anchorage (190c) may be used.

In addition, as shown in a) and b) of FIG. 13, in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, by using a one-way or two-way double wedge anchorage, the wedge Loosening can be prevented, and construction errors due to wedge deflection can be prevented by mechanical double fixing of the double wedge anchor.

On the other hand, Figure 14 is a photograph showing that the eccentric height is adjusted by installing a saddle in the lower part of the girder to which the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention is applied.

14 a) and b), in the case of an external steel wire anchoring device having a double wedge anchorage and eccentric adjustment saddles according to an embodiment of the present invention, the girder through the eccentricity adjustment of the saddles during maintenance of the girder It is possible to improve the reinforcing force of the strands, and by reducing the free length of the strands according to the adjustment of the eccentricity of the saddles, the vibration of the strands can be reduced.

In addition, damage can be prevented by coupling and fixing the saddle to the girder fixing groove, and the strand guide part of the saddle can be arranged in multiple stages according to the number of side strands and lower strands. It can prevent damage and facilitate construction of stranded wires.

On the other hand, Figure 15 is a view showing that the cylindrical chemical hardener is installed in the double wedge anchorage in the external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention.

15, in the case of an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, by inserting and installing a capsule-type chemical hardener 200 in the double wedge anchorage, the anchorage activity amount is reduced It can be reduced to prevent loosening and corrosion of the stranded wire.

Specifically, although the road bridge design standard handbook states that the anchorage activity is 6 mm, the general activity is 2-3 mm.

However, when the amount of activity of the anchorage is limited to within 3mm through the double wedge anchorage, the initial tension loss can be reduced by reflecting the amount of activity of the anchorage applied to the initial tension calculation within 3mm.

For example, when tension is started at the anchorage, the tension force is transmitted to the fixed end and an action (movement) occurs while the wedge is anchored to the anchorage.

A typical anchorage activity is about 2-3 mm, and it does not have a significant effect on long strands, but in the case of short strands, it is enough to reach the elongation management limit, so it is necessary to measure the anchorage activity.

According to an embodiment of the present invention, a cylindrical chemical curing material 200 is placed in the middle of the double wedge anchorage and the chemical curing material capsule bursts when the strand is tensioned. can prevent For example, the anchorage activity amount can be reduced from the existing 6mm to within 3mm.

After all, according to the embodiment of the present invention, it is possible to increase the tension efficiency by minimizing the instantaneous loss by using the one-way double wedge anchorage in the external steel wire anchoring device applied to the girder of the PSC bridge, etc., for example, the amount of anchorage group activity Tension efficiency can be increased by using a double wedge anchorage that can reduce the tension from the existing 6mm to within 3mm. In addition, it is possible to prevent wedge loosening by using a one-way or two-way double wedge anchorage, and construction errors due to the deflection of the wedge can be prevented by mechanical double anchoring of the double wedge anchorage.

[External steel wire reinforcement method using external steel wire anchoring device equipped with double wedge anchorage and eccentric adjustment saddle]

16 is an operation flowchart illustrating a method for reinforcing an external steel wire using an external steel wire fixing device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention, and FIGS. 17A to 17F are each according to an embodiment of the present invention These are side views for specifically explaining a method of reinforcing an external steel wire using an external steel wire anchoring device equipped with a double wedge anchorage and an eccentric adjustment saddle.

16, 17a to 17f, the external steel wire reinforcement method using an external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle according to an embodiment of the present invention,

First, as shown in Fig. 17a, the first and second side anchoring ends 120 and 140 are installed at both ends of the side of the girder 110 for a bridge such as a PSC bridge requiring reinforcement, and the bridge girder 110 lower Install the first and second lower fixing ends 130 and 150 in the width direction of the girder at both ends (S110),

Next, as shown in FIG. 17B , at least one saddle 160 is installed in the lower portion of the bridge girder 110 to correspond to the first and second lower anchoring ends 130 and 150 ( S120 ). .

Next, as shown in FIG. 17c, the side strand 170a and the lower strand 170b are penetrated or fixed to the saddle 160 using the double wedge anchorage 190 for the saddle (S130),

Next, as shown in FIG. 17D , a tension force is introduced into the side strands 170a fixed to the first and second side anchoring ends 120 and 140 , and the first as a double wedge anchoring hole 180 for the anchoring end. , 2 Fixing the side strands 170a to the side anchoring ends 120 and 140 (S140),

Next, as shown in FIG. 17E, a tension force is introduced to the lower stranded wire 170b fixed to the first and second lower anchoring ends 130 and 150, and the first, 2 The lower strands 170b are respectively fixed to the lower anchoring ends 130 and 150 (S150),

Next, as shown in FIG. 17f, the eccentric height of the saddle 160 installed in the lower part of the bridge girder 110 is adjusted (S160),

After all, according to an embodiment of the present invention, it is possible to prevent wedge loosening by using a one-way or two-way double wedge anchorage, and construction errors due to the deflection of the wedge can be prevented by mechanical double anchoring of the double wedge anchorage.

In addition, the reinforcement force of the girder can be improved by adjusting the eccentricity of the saddle during maintenance of the girder, and the vibration of the strand can be reduced by reducing the free length of the strand according to the eccentricity of the saddle.

In addition, damage can be prevented by coupling and fixing the saddle to the girder fixing groove, and the strand guide part of the saddle can be arranged in multiple stages according to the number of side strands and lower strands.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention. do.

100: external steel wire fixing device
110: girder for bridge 120: first side anchorage end
130: first lower settling end
130a: outer first lower anchoring end 130b: inner first lower anchoring end
140: second side anchorage end
150: second lower settling group
150a: outer second lower anchorage end 150b: inner second lower anchorage end 160, 160a, 160b, 160c: saddle
161: first plate 162: second plate
163: threaded bolt 164: threaded nut
165: third plate 166: fourth plate
170a: side strand 170b: lower strand
180: double wedge anchorage for anchorage end
181: first socket
182: first wedge 183: first elastic member
184: second socket 185: third socket
186: second wedge 187: second elastic member
190: double wedge anchorage for saddle
190a: penetrating two-way double wedge anchorage
190b: anchorage type two-way double wedge anchorage
190c: through-type one-way double wedge anchorage
191: first socket 192: first wedge
193: first elastic member 194: second socket
195: third socket 196: second wedge
197: second elastic member 198: lubricant injection hole
200: chemical curing material

Claims (10)

In the external steel wire fixing device installed at both ends and the lower portion of the bridge girder 110 to fix the side stranded wire (170a) and the lower stranded wire (170b),
first and second side anchoring ends 120 and 140 respectively installed at both ends of the bridge girder 110 to fix the side strands 170a along both sides of the bridge girder 110;
first and second lower anchoring ends 130 and 150 installed at both lower ends of the bridge girder 110 to fix the lower stranded wire 170b along the lower surface of the bridge girder 110;
At least one saddle (160) installed on the outside and bottom of both sides of the bridge girder (110) to adjust the eccentric height and guide the side strands (170a) and the lower strands (170b); includes,
The saddle 160,
It consists of an outer saddle installed on the outside of both sides of the bridge girder 110 and an inner saddle installed in a plurality on the lower bottom surface of the bridge girder 110, and the outer saddle is the side strand 170a and the The lower strand (170b) is a saddle formed in two stages to be mounted and guided at the same time, and the inner saddle is a saddle formed in one stage so that the lower strand (170b) is mounted and guided,
The saddle 160 includes a first plate 161 that is installed in close contact with the lower portion of the bridge girder 110; a second plate 162 spaced apart from the first plate 161 to adjust the eccentricity; computerized bolts 163 installed to penetrate the first and second plates 161 and 162; a computerized nut 164 fastened to the computerized bolt 163; a third plate 165 installed under the second plate 162 so that the computational bolt 163 extends through; and a fourth plate 166 installed to be spaced apart from the third plate 165 to guide the side strand 170a or the lower strand 170b,
The eccentric height is adjusted between the first plate 161 and the second plate 162, and the side strand 170a or the lower strand 170b is between the third plate 165 and the fourth plate 166. An external steel wire anchoring device equipped with a double wedge anchorage and an eccentric adjustment saddle, characterized in that it is mounted and guided. According to claim 1,
A double wedge type anchorage for fixing the side strands 170a to the first and second side anchoring ends 120 and 140 and fixing the lower strands 170b to the first and second lower anchoring ends 130 and 150 As, the double wedge anchorage for the anchoring end to prevent loosening of the side strands (170a) and the lower strands (170b) (180); and
A double wedge-shaped anchorage installed in the saddle 160 to penetrate or fix the side strand 170a and the lower strand 170b, respectively, to prevent loosening of the side strand 170a and the lower strand 170b An external steel wire anchoring device having a double wedge anchorage and an eccentric adjustment saddle further comprising a double wedge anchorage 190 for the saddle. 3. The method of claim 2,
The double wedge anchorage for the anchorage end 180,
As a through-type one-way double wedge anchorage,
a first socket 181 through which the side strand 170a or the lower strand 170b passes;
a first wedge 182 inserted between the side strand 170a or the lower strand 170b and the first socket 181 so that the side strand 170a or the lower strand 170b is fixed;
a first elastic member 183 installed at the rear end of the first wedge 182 to provide elasticity to the first wedge 182;
a second socket 184 coupled to the first socket 181 so that the side strand 170a or the lower strand 170b passes therethrough;
a third socket 185 coupled to the second socket 184 through which the side strand 170a or the lower strand 170b passes;
It is installed in one direction with the first wedge 182 to form a double wedge, and the side strand 170a or lower strand 170b and the third socket so that the side strand 170a or the lower strand 170b is fixed. a second wedge 186 inserted between (185); and
An external steel wire fixing device having a double wedge anchorage and an eccentric adjustment saddle including a second elastic member 187 installed at the rear end of the second wedge 186 to provide elasticity to the second wedge 186. 3. The method of claim 2,
The double wedge anchorage 190 for the saddle,
As a penetration-type two-way double wedge anchorage (190a), a fixation-type two-way double wedge anchorage (190b) or a penetration-type one-way double wedge anchorage (190c),
a first socket 191 through which the side strand 170a or the lower strand 170b passes;
a first wedge 192 inserted between the side strand 170a or the lower strand 170b and the first socket 191 so that the side strand 170a or the lower strand 170b penetrates;
a first elastic member 193 installed at the rear end of the first wedge 192 to provide elasticity to the first wedge 192;
a second socket 194 coupled to the first socket 191 so that the side strand 170a or the lower strand 170b penetrates or settles;
a third socket 195 coupled to the second socket 194 through which the side strand 170a or the lower strand 170b passes;
It is installed in one or both directions with the first wedge 192 to form a double wedge, and the side strand 170a or lower strand 170b and the second strand 170a or lower strand 170b are fixed so that the side strand 170a or the lower strand 170b is fixed. a second wedge 196 inserted between the 3 sockets 195; and
An external steel wire fixing device having a double wedge anchorage and an eccentric adjustment saddle including a second elastic member (197) installed at the rear end of the second wedge (196) to provide elasticity to the second wedge (196). 5. The method of claim 4,
Double wedge, characterized in that at least one lubricating oil injection hole 198 is further formed on the outer peripheral surface of the second socket 194 through which grease lubricating oil for preventing corrosion of the side strands 170a and the lower strands 170b is injected. External steel wire anchoring device equipped with anchorage and eccentric adjustment saddle. 3. The method of claim 2,
The capsule-type chemical curing material 200 is inserted and installed in the double wedge anchorage 180 for the anchorage end and the double wedge anchorage 190 for the saddle,
When a tension force is introduced to the side strand 170a and the lower strand 170b in steps d) and e), the side strand 170a and the lower strand 170b are loosened and corroded to prevent corrosion. 170a) and an external steel wire fixing device having an eccentric adjustment saddle, characterized in that after fixing to the lower stranded wire (170b), the capsule-type chemical curing material 200 is hardened by bursting. delete In the external steel wire reinforcement method using an external steel wire fixing device installed at both ends and the lower part of the bridge girder 110 to fix the side stranded wires 170a and the lower stranded wires 170b,
a) Install the first and second side anchoring ends 120 and 140 at both ends of the side of the girder 110 for the bridge requiring reinforcement, and fix the first and second lower portions in the width direction at both ends of the lower end of the girder for the bridge 110 in the width direction Steps of installing the stages (130, 150);
b) installing at least one saddle 160 in the lower portion of the bridge girder 110 to correspond to the first and second lower fixing ends 130 and 150;
c) penetrating or fixing the side strands 170a and the lower strands 170b to the saddle 160 using the double wedge anchorage 190 for the saddle;
d) A tension force is introduced into the side strands 170a fixed to the first and second side anchoring ends 120 and 140, and the first and second side anchoring ends 120 and 140 with a double wedge anchorage 180 for anchoring ends. ) fixing the side strands 170a;
e) Introduced tension to the lower stranded wire 170b fixed to the first and second lower anchoring ends 130 and 150, and using the double wedge anchorage 180 for anchoring ends, the first and second lower anchoring ends 130 and 150 fixing each of the lower strands 170b to the and
f) including the step of adjusting the eccentric height of the saddle 160 installed in the lower part of the girder 110 for the bridge,
The saddle 160 in step b) consists of an outer saddle installed on the outside of both sides of the bridge girder 110 and an inner saddle installed in a plurality on the lower bottom surface of the bridge girder 110, The outer saddle is a saddle formed in two stages so that the side strand 170a and the lower strand 170b are mounted and guided at the same time, and the inner saddle is formed in one stage so that the lower strand 170b is mounted and guided. are birds,
The saddle 160 includes a first plate 161 that is installed in close contact with the lower portion of the bridge girder 110; a second plate 162 spaced apart from the first plate 161 to adjust the eccentricity; computerized bolts 163 installed to penetrate the first and second plates 161 and 162; a computational nut 164 fastened to the computational bolt 163; a third plate 165 installed under the second plate 162 so that the computational bolt 163 extends through; and a fourth plate 166 spaced apart from the third plate 165 to guide the side strand 170a or the lower strand 170b, wherein the first plate 161 and the second plate 162 are provided. ), the height of the eccentricity is adjusted between the third plate 165 and the fourth plate 166, and the side strand (170a) or the lower strand (170b) is mounted and guided, characterized in that the double wedge anchorage and External steel wire reinforcement method using an external steel wire anchoring device equipped with an eccentric adjustment saddle. 9. The method of claim 8,
The saddle double wedge anchorage 190 is a through-type two-way double wedge anchorage (190a), a fixation-type two-way double wedge anchorage (190b) or a through-type one-way double wedge anchorage (190c),
a first socket 191 through which the side strand 170a or the lower strand 170b passes;
a first wedge 192 inserted between the side strand 170a or the lower strand 170b and the first socket 191 so that the side strand 170a or the lower strand 170b penetrates;
a first elastic member 193 installed at the rear end of the first wedge 192 to provide elasticity to the first wedge 192;
a second socket 194 coupled to the first socket 191 so that the side strand 170a or the lower strand 170b penetrates or settles;
a third socket 195 coupled to the second socket 194 through which the side strand 170a or the lower strand 170b passes;
It is installed in one or both directions with the first wedge 192 to form a double wedge, and the side strand 170a or lower strand 170b and the second strand 170a or lower strand 170b are fixed so that the side strand 170a or the lower strand 170b is fixed. a second wedge 196 inserted between the 3 sockets 195; and
An external steel wire anchoring device having an eccentric adjustment saddle and a double wedge anchorage including a second elastic member 197 installed at the rear end of the second wedge 196 to provide elasticity to the second wedge 196 is used. How to reinforce external steel wire. delete

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