KR20170029848A - Sleeve compressing apparatus for near surface mounted fiber reinforced polymer reinforcement and concrete structure reinforcing method for increasing ductility of concrete structure therewith - Google Patents

Sleeve compressing apparatus for near surface mounted fiber reinforced polymer reinforcement and concrete structure reinforcing method for increasing ductility of concrete structure therewith Download PDF

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KR20170029848A
KR20170029848A KR1020150126946A KR20150126946A KR20170029848A KR 20170029848 A KR20170029848 A KR 20170029848A KR 1020150126946 A KR1020150126946 A KR 1020150126946A KR 20150126946 A KR20150126946 A KR 20150126946A KR 20170029848 A KR20170029848 A KR 20170029848A
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South Korea
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frp
sleeve
concrete structure
compression
tension member
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KR1020150126946A
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Korean (ko)
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KR101778002B1 (en
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정우태
금문성
박영환
강재윤
박종섭
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한국건설기술연구원
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

In the FRP surface embedding method for reinforcing a concrete structure by embedding the FRP surface material on the surface, it is possible to more effectively manufacture the compression type sleeve used for manufacturing the FRP tension material. When reinforcing the concrete structure by the FRP surface embedding method, Which is advantageous for securing sufficient ductility, and a reinforcing method of a concrete structure capable of improving ductility using the same.

Description

FIELD OF THE INVENTION The present invention relates to a method for reinforcing a concrete structure of a FRP reinforced concrete slab, and a method of reinforcing a concrete structure using the FRP reinforced concrete sleeve for reinforcing a concrete structure using the FRP reinforced concrete sleeve,

The present invention relates to an apparatus for manufacturing a compression type sleeve for a surface-embedded FRP tensile material and a method for reinforcing a concrete structure capable of improving ductility using the same. More particularly, the present invention relates to an FRP surface embedding method for reinforcing a concrete structure by surface- , It is possible to more effectively manufacture a compression type sleeve used for fabricating the FRP tensile material, and a surface-buried FRP which is advantageous in securing sufficient ductility when reinforcing a concrete structure by FRP surface embedding method. And a reinforcing method of a concrete structure capable of improving ductility using the same.

Generally, a method of reinforcing a concrete structure by introducing a prestress according to a conventional technique is a method of fixing a tension member to a fixing device after tension by using a fixing device projected on an outer surface of an end portion of a concrete structure.

However, in the method of reinforcing concrete structures according to the related art, since the fixing device protrudes on the outer surface of the concrete structure, the appearance of the concrete structure after the reinforcing is deteriorated.

For example, as shown in Fig. 1, brackets 4 and 4 'are fixed to both side ends of a concrete beam 2 (a girder) of a bridge 1, and a tension member 7 is disposed.

One end of the tension member 7 is fixed to one side of the bracket 4 'and the other end of the tension member 7 is tensioned by the hydraulic jack 9 provided on the other side bracket 4.

That is, the brackets 4 and 4 'may be used as a fixing device, and the tension member 7 may be tensioned by using the hydraulic jack 9. [

Therefore, the fixing device must secure a space that is protruded from both end surfaces of the concrete beam to be installed,

There is a limit to the application when the space for installing the fixing device on the reinforcing object side of the concrete structure is insufficient, for example, when the reinforcing object side of the concrete structure is adjacent to the neighboring structure.

Particularly, in a concrete beam (girder) of a bridge, if the tension device is installed on the lower surface of the concrete beam after the fixing device is installed, the fixing device occupies the lower space of the concrete beam, .

In addition, the fixing device such as the bracket is mainly made of a metal material, which is installed outside the concrete structure and is continuously exposed to moisture due to rainfall or the like, so that the bracket can be easily corroded,

In this case, if the fixing device is broken as well as damaging the appearance of the concrete structure due to the flow of the green wood, there is a problem in the reinforcing effect.

Therefore, damage of the fixing device may result in loss of strength of the concrete structure, resulting in destruction of the concrete structure.

In this case, the tension member usually uses a tendon (PC strand, steel bar, etc.). Recently, a method of reinforcing a concrete structure by using an FRP tension member has been introduced.

FIG. 2A is a schematic view for explaining a method of reinforcing a concrete structure by tautening a conventional FRP tensile material, and FIG. 2B is a perspective view showing a tensile device for a FRP tensile material according to a conventional technique.

That is, as shown in FIG. 2A, a conventional method of reinforcing a concrete structure by tensing the FRP tensile material is to use a surface embedding fixation device embedded in a concave groove formed on the bottom surface of a concrete structure and a tension device for FRP tension material, And the groove is filled with the grouting material.

In this case, when the FRP tension member for introducing a tensile force into the FRP tensile material is embedded after the FRP tensile material is strained on the concave groove, as shown in FIG. 2B, when the space of the end portion of the concrete structure is narrow, It is made use of what is made in the form which can be installed.

A base 12 fixed to the reinforcing object surface 10 of the concrete structure;

A clamping member 18 connected to an end of the FRP prestressing material 14 at the bottom of the base 12;

A movable member 22 installed to be movable in a direction to tense the FRP tensile material 14 at an upper portion of the base 12 and connected to the clamping member through an opening 16 formed in the base 12, );

A pressing member (24) for pressing the moving member (22) to move in a direction in which the FRP tensile material (14) is tensed; And

And a position fixing member 30 that fixes the position of the movable member 22 when the movable member 22 is moved. Thus, the FRP tension member 14 is inserted into the concave groove formed in the reinforcing object surface 10 of the concrete structure, It is possible to stably tense in the direction of the arrow.

Therefore, FRP reinforcement method is called as surface embedding FRP reinforcement method by reinforcing concrete structure by fixing FRP tension material embedded in concave groove formed in concrete structure after tension using FRP tension material tension device.

FIG. 3 is a graph showing the ductility characteristics (expressed as ductility, which means the ratio of deformation from the yielding to the just before fracture of the reinforcing bars or FRP tensions) of the concrete structure reinforcing method using reinforcing bars or FRP tensions according to the prior art Fig.

That is, as shown in FIG. 3A, since the reinforcing bars behave in a ductile manner and the FRP tensile members behave in a brittle manner, when the FRP tensile material is used to reinforce the concrete structure, the concrete structure has a brittle fracture behavior .

As shown in FIG. 3B, it can be seen that the ductility of the concrete structure can be reduced when reinforced with the FRP reinforced method using the FRP reinforced concrete, unlike the reinforced concrete structure (non-reinforced concrete).

In order to secure the ductility of the reduced concrete structure, as shown in FIG. 1C, there is also disclosed a surface-embedded FRP reinforcement method in which an unattached section is arbitrarily set in the attachment section of the FRP tensioner and the grouting material. However, There is a problem that the rigidity of the concrete structure may be lowered as compared with the existing surface-embedded FRP reinforcing method.

In particular, FRP tie materials are anisotropic materials with low transverse strength in comparison with longitudinal strength and can not be used for conventional PC steel liner fixtures that are fixed by physical force.

Thus, like the clamping member 18 of Figure 2c, most of the FRP tensions introduce a tensile force using a dedicated FRP anchorage.

Among these FRP fixtures, especially the compression type fixture, is a FRP fixture that presses a cylindrical tube-shaped compression sleeve with swaging equipment at the end of the FRP tensile material. Since the FRP fixture is compression-molded on the FRP tensile material, It is very advantageous in the FRP reinforcement method of surface embedding.

However, since the squeezing type fixing member is manufactured by using the swaging equipment, there is a disadvantage that the extension length is prolonged compared with other conventional FRP fixing sockets, so that the squeezing type fixing member may be bent during the manufacturing process.

That is, according to FIG. 4, the operation sequence of the swaging apparatus necessary for manufacturing the conventional pressure-applied type fastening openings can be confirmed.

First, as shown in FIG. 4A, the compression sleeve 51 is fitted to the end of the FRP tensile material 14 and aligned between the hydraulic jack 52 for extrusion and the swaging block 53 for compression,

The hydraulic jack 52 is operated to allow the compression sleeve 51 to pass through the swaging block 53, as shown in FIG. 4B.

At this time, since the passing hole inner diameter of the swaging block 53 is smaller than the outer diameter of the compression sleeve 51, the compression sleeve 132 is forced by the hydraulic jack to pass through the through hole, do.

4d, the compression sleeve 51 passing through the swaging block 53 is reduced in diameter to the same size as the inner diameter of the through-hole passing through the swinging block 53 and the girder, and the length is increased, (130) and integrated with each other.

However, as shown in FIG. 5, in the process of increasing the length of the compression sleeve 51 passing through the swaging block 53, the compression sleeve may be bent, have.

Korean Patent No. 10-1139393 filed on Feb. 16, 2011, entitled "Attachment type fusing device for FELAF cable " and " Korean Patent No. 10-489373 filed on Mar. 6, 2003, entitled " Method of Repairing / Reinforcing Structures Using Non-Attachable Epoxy Sheet and Sheet Fixing Device Used Therefor " Korean Patent No. 10-653632 filed on Jan. 18, 2006, entitled "Tension of fiber-reinforced composite material and method of reinforcing concrete structure by landfill" Korean Patent No. 10-653629 filed on Jan. 18, 2006, entitled " Tension device capable of tensioning the tension material placed on the inner side of the concrete structure on the surface " Korean Patent No. 10-1501154 filed on Nov. 5, 2013, entitled " Gear-type Surface Filler < RTI ID = 0.0 & Korean Patent No. 10-1005347 filed on November 13, 2008, entitled " Surface Embedded Tension Device for Strengthening Structures and Tension Method "

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems,

Fiber Reinforced Polymer (FRP) In a surface-embedded FRP reinforcing method using a tensile material, the surface is post-treated with aluminum oxide so as to improve the ductility of the concrete structure in which the FRP prestressing material is embedded And a method of reinforcing a concrete structure capable of improving ductility using the FRP tension member.

Another object of the present invention is to provide a press-fit sleeve manufacturing apparatus (swaging equipment) for a FRP tension member, which includes a sleeve guide rod and a sleeve guide plate to ensure straightness, The present invention provides a method of manufacturing a press-fit sleeve for a surface-embedded FRP tensile material and a method of reinforcing a concrete structure using the same.

Another object of the present invention is to provide an apparatus for manufacturing a compression type sleeve for a surface buried FRP tension member capable of forming a compression sleeve with a minimum size applicable to a surface buried FRP reinforcing method, And to provide a method for reinforcing a concrete structure.

As a means for achieving the above-mentioned technical object,

An apparatus for integrating a compression sleeve for an FRP tensioner at an end of an FRP tensioner, comprising: a hydraulic jack disposed between the first and second stationary supports for moving a compression sleeve for FRP tension material forward; A swaging block formed on the front fixing part disposed on the front surface of the second fixed support part and pressing the compression sleeve for the FRP tension member; A sleeve guide plate disposed between the second fixed support portion and the front fixing portion and movable in the direction of the front fixing portion together with the compression sleeve for the FRP tension member by the hydraulic jack; And

And a sleeve guide rod having one side fixed to the front fixing part and the other side installed to penetrate the sleeve guide plate so that the sleeve guide plate can move with straightness. .

At this time, the swinging block is formed as a circular block and mounted on the back part of the front fixing part and the extension guide pipe is protruded on the front part, and the compression sleeve for the FRP tension member passes through the through hole of the swaging block, In addition to the thickness of the gong block.

In addition, the FRP prestressing material utilizes post-treatment of the surface with aluminum oxide in situ.

Also, when the press-fit sleeves for the FRP tension members pass through the sleeve guide plates, a nose for centering of the press-fit sleeves for FRP tension members is additionally formed on the sleeve guide plates.

In addition, the compression sleeve for the FRP tension member passing through the swaging block has the same size as the inside diameter of the swaging block, and the diameter is reduced and the length is increased.

The sleeve guide rod may further include a sleeve guide rod fixing nut fastened to the plurality of sleeve guide rods to fix one side of the sleeve guide rod to the front fixing part.

Wherein the swinging block is formed as a circular block and mounted on the back surface of the front fixing part, and an extension guide tube is installed on the front surface so as to protrude so as to penetrate the front fixing part, and the compression sleeve for the FRP tension member is inserted into the through hole of the swaging block In addition to the thickness of the swaging block, the passage of the extension guide tube is further extended.

The apparatus for manufacturing a press-fit sleeve for a surface-buried FRP tensile member includes an anchor bolt through an anchor hole formed in the first and second stationary supporters and the front securing unit so as to be portable, So that it can be temporarily attached to and fixed to the bottom plate of the manufacturing facility.

Also, it is possible to provide an FRP tension member integrated with a compression sleeve for a FRP tension material manufactured by using the apparatus for manufacturing a compression type sleeve for a surface buried FRP tension member.

Also

In a surface-embedded FRP reinforcement method using a FRP tension member having a compression sleeve formed by using a compression sleeve forming apparatus for surface-embedded FRP tension material,

a) post-treating the surface of the FRP prestressing material with aluminum oxide in situ after the FRP prestressing material, and then installing a compression sleeve for the FRP tensioning material at the end;

b) installing the compression sleeve for FRP tension material through a nose formed in a sleeve guide plate of a compression type sleeve manufacturing apparatus for a surface buried FRP tension member;

c) advancing the sleeve guide plate with a compression sleeve for the FRP tension member using a hydraulic jack;

d) compressing the compression sleeve of the FRP tension member through a swaging block formed in the front fixing part, thereby pressing the FRP tension member to the end of the FRP tension member; And e) fixing the post-tensioned FRP tensile material squeezed by the compression sleeve for the FRP tension material to the recessed recess formed in the concrete structure. The method of claim 1, Thereby providing a structure reinforcement method.

The present invention also provides a concrete structure reinforced by a concrete structure reinforcing method capable of improving ductility using a press-formed sleeve producing apparatus for a surface buried FRP tension member, wherein the concrete structure includes a girder for a bridge.

According to the present invention,

Fiber Reinforced Polymer (FRP) Ductility of FRP reinforced concrete structures by using FRP prestressing material whose surface is post-coated with aluminum oxide is used in FRP reinforcement method using surface tension. Can be improved.

According to the present invention, in the compression bonding apparatus for a press-fit sleeve for a surface-embedded FRP tension member, a sleeve guide bar and a sleeve guide plate are provided to ensure straightness, thereby preventing warpage of the compression sleeve during compression of the compression sleeve by the hydraulic jack .

According to the present invention, a compression sleeve can be formed with a minimum size that can be applied to a method of pressing a compression sleeve for a surface-embedded FRP tension member.

1 is an installation perspective view of a fixing device used in a conventional concrete beam,
FIG. 2A is a perspective view of reinforcing concrete structure using conventional FRP tensile material, FIG.
FIG. 2B is an installation perspective view of a tension device for a conventional FRP tension member,
FIGS. 3A, 3B, and 3C are diagrams showing a ductility characteristic of a conventional reinforcing bar and a FRP reinforcing material, a ductility characteristic diagram of a surface embedding FRP reinforcing method, a ductility characteristic contrast of a surface embedding FRP reinforcing method having a non-
FIG. 4 is a flowchart showing the operation of a swaging device required for manufacturing a conventional pressure-
FIG. 5 is a photograph showing the production of a warped compression sleeve in the conventional manufacturing process,
6A and 6B are photographs of a device for manufacturing a compression type sleeve for a surface-embedded FRP tension material according to an embodiment of the present invention,
7A and 7B are photographs of an apparatus for manufacturing a compression type sleeve for a surface-embedded FRP tension member according to an embodiment of the present invention,
8 is a view illustrating a process of manufacturing an FRP taut material according to an embodiment of the present invention,
FIGS. 9A, 9B and 9C are cross-sectional views of a press-fit fastener, an FRP taut material, an aluminum oxide post-treated FRP taut material photograph according to an embodiment of the present invention,
FIG. 10 is a photograph of a FRP tensile material in which a compression-type fastening opening according to an embodiment of the present invention is integrated,
FIG. 11 is a view showing ductability characteristics in a device for manufacturing a compression type sleeve for a surface-embedded FRP tensile material according to an embodiment of the present invention;
FIG. 12 is a flowchart of a concrete structure reinforcing method capable of improving ductility using an apparatus for producing a compression type sleeve for a surface-embedded FRP tensile material according to an embodiment of the present invention;
13A and 13B are photographs of a verification test of a concrete structure capable of improving ductility using a device for manufacturing a compression sleeve for a surface embedded FRP tensioner according to an embodiment of the present invention;
FIG. 14 is a graph showing the results of an improved test of the ductility of a concrete structure capable of improving ductility using a press-formed sleeve producing apparatus for a surface-buried FRP tensile material according to an embodiment of 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.

[Device for manufacturing a compression type sleeve for surface-embedded FRP tension material (200)]

6A and 6B are photographs showing a device for manufacturing a compression type sleeve for a surface-embedded FRP tension material according to an embodiment of the present invention.

6A and 6B, an apparatus 200 for manufacturing a press-fit sleeve for a surface-buried FRP tensioner according to an embodiment of the present invention includes a compression sleeve for an FRP tension material embedded in a fixing portion of a concave groove formed in a concrete structure, As swaging equipment that presses,

A swaging block 260 having first and second fixed supporting portions 210 and 220, a front fixing portion 230, a hydraulic jack 240, a fixing support connecting rod 250 and an extension guide pipe 261, A sleeve guide plate 270, a sleeve guide rod 280, and a sleeve guide rod fixing nut 290.

6A and 6B, the first fixed supporting portion 210, the second fixed supporting portion 220, and the front fixing portion 230 are disposed.

At this time, the first and second fixed supporting portions 210 and 220 are connected and fixed by four fixed supporting connecting rods 250 so as to have an integral structure.

 A hydraulic jack 240 is provided between the first fixed supporting portion 210 and the second fixed supporting portion 220 so that a sleeve guide The plate 270 can be moved forward (left side in Fig. 6A).

That is, the hydraulic jack 240 is disposed between the first and second stationary supporting portions 210 and 220 connected to the fixing support connecting rod 250, and the press-fitting sleeves 330 and 340 for the FRP tension member, The plate 270 is moved forward.

The front fixing part 230 is disposed in front of the second fixing supporting part 220 so that the compression type sleeves 330 and 340 for FRP tension members can be pressed.

The swaging block 260 is formed on the front fixing part 230 so as to compress the compression type sleeves 330 and 340 for the FRP tension material so that the compression type sleeves 330, and 340 may have the same size as the inner diameter of the swaging block 260 and may be compressed into the FRP tensile material 310 in a reduced diameter.

At this time, the swinging block 260 is formed as a circular block and mounted on the back part of the front fixing part 230, and the front part is provided with an extension guide pipe 261 protruding through the front fixing part 230 .

That is, even though the compression sleeve (330, 340) passes through the through hole of the swaging block (260), the extension length extends through the extension guide tube (261) in addition to the thickness of the swaging block (260) It can be seen that the problem of warping or the like is not generated.

The sleeve guide plate 270 is disposed between the second fixed supporting portion 220 and the front fixing portion 230 so that the hydraulic jack 240 can press the front and rear sides together with the compression type sleeves 330, And moves in the direction of the arrow 230.

At this time, when advancing the sleeve guide plate 270,

As shown in FIG. 7A, a nose 271 for matching the centers of the compression sleeves 330 and 340 for the FRP tension members is installed through the center of the sleeve guide plate 270.

Further, the sleeve guide plate 270 is formed with through holes through which a plurality of sleeve guide rods 280 pass.

The sleeve guide bar 280 is fixed to the front fixing part 230 at one side and is installed at a plurality of, for example, four, shafts so that the other side passes through the sleeve guide plate 270, Can pass through the sleeve guide rods 280 and move with straightness. Thus, the compression sleeves 330 and 340 of the FRP prestressing material 310 can be moved with straightness.

The sleeve guide rod fixing nut 290 is fastened to the plurality of sleeve guide rods 280 so as to fix one side of the plurality of sleeve guide rods 280 to the front fixing portion 230, do.

The apparatus 200 for manufacturing a compression type sleeve for a surface buried FRP tension material according to an embodiment of the present invention is a portable portable apparatus

The anchor bolts are passed through the anchor holes formed in the first and second fixed supporting portions 210 and 220 and the front fixing portion 230 to form a press-fit sleeve manufacturing apparatus 200 for surface- As shown in Fig.

Further, a load cell (not shown) for detecting the load of the hydraulic jack 240 may be additionally installed between the first fixed supporting portion 210 and the hydraulic jack 240.

The apparatus 200 for manufacturing a compression type sleeve for a surface-embedded FRP tension member according to an embodiment of the present invention includes:

A problem may arise when the compression sleeves 330 and 340 manufactured to secure the extended length of the compression type sleeves 330 and 340 for tensing the FRP tensile material 310 pass through the swaging block 260 there is,

In order to prevent this, a sleeve guide bar 280 and a sleeve guide plate 270, which can maintain straightness,

The nose 271 is formed in the sleeve guide plate 270 so that the pressing sleeves 330 and 340 of the steel material can be accurately mounted on the center of the sleeve guide plate 270,

In addition, since the thickness of the swaging block 260 can be minimized by using the swaging block 260 having the guide block 261, a more efficient and economical compression sleeve can be installed.

[FRP Tension Material (310) which is capable of improving ductility after aluminum oxide treatment)

FIG. 8 is a view showing a manufacturing process of a FRP tensile material capable of improving ductility according to an embodiment of the present invention. FIG. 9 is a cross-sectional view of a FRP tensile material capable of improving ductility according to an embodiment of the present invention. . Fig.

As shown in FIG. 8, the FRP tensile material 310 used in the apparatus for manufacturing a press-fit sleeve for a surface buried FRP tensile material according to an embodiment of the present invention includes a coated aluminum oxide And press-bonding the compression sleeve, which is a fixing tool.

Specifically, for the purpose of factory production, a plurality of FRP fibers are impregnated into a resin to collect these FRP fibers, heat is applied to pass through a predetermined mold, the resin is cured and then drawn, and FRP is wound on a predetermined roller The final bar-shaped FRP cable is produced by cutting.

After cutting the rod-shaped FRP cable in the field, the surface of the FRP prestressing material 310 is post-treated with the coated aluminum oxide 320, and the compression-type sleeves 330 and 340 are fastened to the embodiment of the present invention 0.0 > 310 < / RTI >

That is, the FRP prestressing material 310 is post-coated with the aluminum oxide 320 on the surface of the FRP prestressing material 310 so that the FRP prestressing material 310 has an adhesion strength of about 10 MPa desirable.

Thus, the FRP prestressing material 310 according to an embodiment of the present invention includes FRP prestressing material 310, coated aluminum oxide 320, compression sleeves 330 and 340, and sleeve fixing nuts 350 ),

As shown in FIG. 9C, the aluminum oxide 320 is coated on the FRP prestressing material 310 shown in FIG. 9B.

At this time, since the threads are formed on the surfaces of the compression sleeves 330 and 340, the compression sleeves 330 and 340 can be fastened to the sleeve fixing nuts 350.

Thus, the FRP tension member 310 in which the compression sleeves 330 and 340 are installed can be seen in FIG.

11 is a graph showing the ducting characteristics in a device for manufacturing a compression type sleeve for a surface buried FRP tensile material according to an embodiment of the present invention.

In the case of the concrete structure in which the FRP tensile material according to the prior art is embedded, the adhesive force between the grouting filler, which is the buried concave groove filling material after the yielding of the buried reinforcing bar, and the FRP tensile material is strong, FRP tensions may be instantaneously destroyed and the ductility of the concrete structure may not be secured.

7A and 7B, the FRP tensile material 310 fabricated by using the apparatus 200 for producing a press-fit sleeve for a surface embedding FRP tension material according to an embodiment of the present invention is embedded in a concrete structure In the case of,

By post-treating the surface of the FRP tensile material 310 with aluminum oxide as shown in Figure 9c,

The tensile force is applied to the lower portion of the concrete structure due to the bending of the FRP tensile member 310 and the tensile stress is applied between the FRP tensile member 310 and the lower concrete before the tensile stress is applied between the grouting filler, It is possible to form an unattached section in the concrete structure, thereby improving the ductility of the concrete structure.

That is, in the case of the concrete structure in which the FRP tensile material is embedded by using the apparatus 200 for producing a compression type sleeve for a surface buried FRP tensile material according to an embodiment of the present invention, after the buried reinforcing bar surrenders the FRP tensile material 310 and the concrete Adhesion failure occurs between the surfaces of the structure, thereby forming an unattached section, and the tensile strength is maintained in the FRP prestressing material 310 at the end portion by the press-type surface-embedded fixing device, so that the ductility can be improved.

In the case of the apparatus for manufacturing a press-fit sleeve for a surface-buried FRP tension member according to an embodiment of the present invention, the straightness of the compression-type sleeves 330 and 340 is ensured according to the sleeve guide rod 280 and the sleeve guide plate 270, It is possible to prevent warpage of the battery 310. In addition, the sizes of the compression sleeves 330 and 340 can be reduced to facilitate the surface filling of the concrete structure. For example, compression sleeves 330 and 340 having an outer diameter of 24 mm and a diameter of 155 mm can be formed so as to be surface-embedded at the end of the FRP prestressing material 310.

Further, in the case of the apparatus for producing a press-fit sleeve for a surface-embedded FRP tension member according to an embodiment of the present invention, a FRP tension member 310 whose surface is post-coated with aluminum oxide can have a low adhesive strength of about 10 MPa, Accordingly, the ductility of the concrete structure in which the FRP tensile material 310 is embedded on the surface can be improved.

[Method of Reinforcing Concrete Structures Using the Device 200 for Manufacturing a Compression Sleeve for Surface Embedded FRP Tension Material]

12 is a flowchart illustrating a method of reinforcing a concrete structure using an apparatus 200 for manufacturing a compression sleeve for a surface-embedded FRP tensioner according to an embodiment of the present invention.

7, the surface of the FRP prestressing material 310 is post-treated with a coating aluminum oxide to prepare a post-treated FRP prestressing material 310, (Inserts) a compression sleeve for the FRP tensile material at the end of the tensile material 310. (This is simply referred to as a compression type sleeve for the FRP tensile material 310.)

Next, as shown in FIGS. 6A and 6B, by using the apparatus 200 for producing a press-fit sleeve for a surface-buried FRP tension member of the present invention, the press-fit sleeve for the FRP tension member 310 is inserted into the post- So that they are integrated with each other.

That is, as shown in FIG. 12,

A compression sleeve for FRP tension material is installed at the end of the post-treated FRP tensile material 310, and a device 200 for manufacturing a compression type sleeve for a surface buried FRP tension material is disposed at a manufacturing site (S110).

Next, the post-treated FRP tensile material compression sleeve of the post-treated FRP tensile material 310 is passed through the nose 271 formed in the sleeve guide plate 270 of the device 200 for manufacturing a press-fit sleeve for a surface embedded FRP tension member (S120).

The nose 271 is formed in the sleeve guide plate 270 so that the center of the compression sleeve for the FRP tension member is aligned when the compression sleeve for the FRP tension member passes through the sleeve guide plate 270 It plays a role.

Next, the sleeve guide plate 270 is advanced at the end of the post-processed FRP tensile material 310 by using the hydraulic jack 240 together with the compression sleeve for FRP tension material (S130).

The sleeve guide plate 270 advances along the sleeve guide bar 280 so that the sleeve guide plate 270 can move with a straight line. The sleeve guide bar 280 is fixed to the front fixing part 230 at one side, And is inserted through the sleeve guide plate 270. Therefore, the sleeve guide bar 280 and the sleeve guide plate 270 can secure the straightness and prevent the compression jacket for the FRP tensile material from being bent when the hydraulic jack 240 is compressed.

Next, the compression sleeve for the FRP tension member is passed through the swaging block 260 having the extension guide pipe 261 formed in the front fixing part 230, and is then pressed (S140).

At this time, the compression sleeve for the FRP tension member passing through the swaging block 260 has the same size as the inner diameter of the swaging block 260, and the diameter is reduced, and the length is increased.

Next, it is preferable to fix the sleeve fixing nut 350 to the thread formed in the compression sleeve for the FRP tension member in the fixing unit formed in the concrete structure.

When the press-fit type sleeve for FRP tension member is completed to the FRP tensile material 310 by using the apparatus 200 for producing a surface-buried FRP tension sleeve,

A concave groove in which the FRP tensile material 310 integrated with the compression sleeve for FRP tensile material is embedded can be formed on the bottom of the concrete structure, for example, in the concrete structure to be reinforced.

After inserting the FRP tensile material 310 integrated with the compression sleeve for the FRP tensile material into the concave groove, the FRP tension material is clamped and tightened so that the FRP tension material can be tightened and tensed using a surface embedding fixing device and a tension device for FRP tension material A method is adopted in which a tensile force is introduced into the FRP tensile material 310 and the grouting material is filled in the concave groove (S150).

Accordingly, in the case of the concrete structure in which the FRP prestressing material 310 is surface-embedded, the surface of the FRP prestressing material 310 is post-treated in situ by coating aluminum oxide, Adhesion failure between the FRP prestressing material 310 and the lower concrete occurs before the tensile stress is applied and after the yielding failure between the concave grooved material and the lower concrete occurs after the yielding of the tensile reinforcing bar, An attachment section may be formed to improve the ductility of the concrete structure.

As a result, according to the embodiment of the present invention, in the surface embedding reinforcement method using the FRP tensile material, the FRP tension material whose surface is post-coated with aluminum oxide is used so as to improve the ductility of the concrete structure in which the FRP tensile material is embedded In addition, since the sleeve guide rod and the sleeve guide plate are provided in the compression bonding apparatus for the press-fit sleeve for the FRF for surface embedding, the warp of the compression sleeve can be prevented when the compression sleeve is compressed by the hydraulic jack, There is provided an apparatus and a method for manufacturing a press-fit sleeve for a surface-embedded FRP tension member capable of forming a press-fit sleeve with a minimum size applicable to a pressing method of a press-fit sleeve for FRP surface-embedded FRP tension members.

[Verification experiment]

FIG. 13 is a photograph illustrating a test method for reinforcing a reinforced concrete structure using a device 200 for making a compression sleeve for a surface-embedded FRP tensioner according to an embodiment of the present invention. FIG. And the ductility of the reinforced concrete structure is improved.

13A and 13B are experimental equipment 500 for a verification test on a device for fabricating a press-fit sleeve for a surface-embedded FRP tensioner according to an embodiment of the present invention, wherein FRP prestressing material 310 comprises a reinforcing bar So that the existing stiffness can be improved. After the rebar breakage, the FRP tensile material 310 behaves as a ductile due to the occurrence of adhesion failure.

Therefore, as shown in FIG. 14, according to the method of pressing the compression type sleeve for the surface embedded FRP tensile material capable of improving the ductility according to the embodiment of the present invention, the ductility of about 21% is improved compared with the conventional method .

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.

200: Surface-embedded FRP crimping sleeving device for tensile material
210: a first fixed support
220: a second fixed support
230:
240: Hydraulic Jack
250: Fixed support connecting rod
260: Swaging Block
261: Extension guide tube
270: Sleeve guide plate
271: Nose
280: sleeve guide rod
290: Sleeve guide rod fixing nut
310: FRP tension material
320: Coated aluminum oxide
330, 340: Compression sleeve
350: Sleeve fixing nut
400: Concrete structure
500: Ductility test equipment

Claims (19)

An apparatus for integrating a compression sleeve for FRP tension material at an end of an FRP tensile material 310,
A hydraulic jack 240 disposed between the first and second stationary supports 210 and 220 for moving the compression sleeve for FRP tension material forward;
A swaging block 260 formed on the front fixing part 230 disposed on the front surface of the second fixed support part 220 and pressing the compression sleeve for the FRP tension member;
A sleeve guide plate 230 disposed between the second fixed support portion 220 and the front fixing portion 230 and movable in the direction of the front fixing portion 230 together with the compression sleeve for the FRP tension member by the hydraulic jack 240, (270); And
And a sleeve guide rod 280 having one side fixed to the front fixing part 230 and the other side inserted through the sleeve guide plate 270 so that the sleeve guide plate 270 can move with straightness Surface-embedded FRP tension device. The method according to claim 1,
The swinging block 260 is formed as a circular block and is mounted on the backside of the front fixing part 230 and the extension guide pipe 261 is provided on the front part of the swinging block 260 so that the compression sleeve for the FRP tensioning member is inserted into the swinging block 260 to pass through the extension guide tube in addition to the thickness of the swaging block. The method according to claim 1,
Wherein the FRP prestressing material (310) is post-coated with a surface aluminum oxide (320) in situ. The method according to claim 1,
A nose 271 for center alignment of the compression sleeve for the FRP tension member is formed on the sleeve guide plate 270 when the press-fit sleeve for the FRP tension member passes through the sleeve guide plate 270, A device for producing a compression sleeve for tensioning material. The method according to claim 1,
Wherein the compression sleeve for the FRP tensioning material passing through the swaging block 260 is compressed in the same size as the inner diameter of the swaging block 260 to have a reduced diameter and an increased length. The method according to claim 1,
And a sleeve guide rod fixing nut (290) fastened to the plurality of sleeve guide rods (280) to fix one side of the sleeve guide rods (280) to the front fixing part (230) A device for producing a compression sleeve for tensioning material. The method according to claim 1,
The swinging block 260 is formed as a circular block and is mounted on the back surface of the front fixing part 230. An extension guide tube 261 is installed on the front surface of the swinging block 260 so as to protrude through the front fixing part 230, Wherein the re-press-fit sleeves pass through the through hole of the swaging block (260) to allow the extension guide tube (261) to pass through in addition to the thickness of the swaging block. The method according to claim 1,
The apparatus 200 for manufacturing a press-fit sleeve for a surface-embedded FRP tension member is constructed such that an anchor bolt is passed through an anchor hole formed in the first and second stationary support portions 210 and 220 and the front fixing portion 230 so as to be portable A surface-embedded FRP tension device for producing a press-fit sleeve 200 for surface-embedded FRP tensioning device, which is capable of being temporarily attached and fixed to a floor plate of a fabrication plant. A FRP tensioner integrated with a compression sleeve for FRP tension material manufactured using a compression sleeve assembly for surface-embedded FRP tension material of claim 1. In the surface-embedded FRP reinforcement method using the FRP tension member 310 equipped with the compression sleeve manufactured using the apparatus 200 for producing the surface-buried FRP tension sleeve,
a) the FRP prestressing material 310 is post-treated in situ on the surface of the FRP prestressing material 310 with aluminum oxide 320 and then installed with a compression sleeve for FRP tension material at the end;
b) installing the compression sleeve for FRP tension through the nose (271) formed in the sleeve guide plate (270) of the device (200) for manufacturing a press-fit sleeve for a surface embedded FRP tensioner;
c) advancing the sleeve guide plate 270 with the compression sleeve for the FRP tension member using the hydraulic jack 240;
d) compressing the compression sleeve of the FRP tension member through a swaging block 260 formed in the front fixing part 230 so that the compression sleeve for the FRP tension member is pressed onto the end of the FRP tension member 310; And
and e) fixing the FRP prestressing material (310) squeezed by the compression sleeve for the FRP tensioning material to the concave grooves formed in the concrete structure, after the tensioning, to improve the ductility of the FRP tensioning material. Possible method of reinforcing concrete structures. 11. The method of claim 10,
The FRP prestressing material 310 may be post-treated in situ on the surface of the FRP prestressing material 310 with aluminum oxide 320 so that the FRP prestressing material 310 may be manufactured as a press-fit sleeve for a surface buried FRP tensioning material having an adhesion strength of 10 MPa or less A Method of Reinforcing Concrete Structures with Improved Ductility Using Device. 11. The method of claim 10,
In the case of the concrete structure in which the FRP prestressing material 310 is surface-embedded, the surface of the FRP prestressing material 310 is post-treated in situ with the coating aluminum oxide, so that the tensile force Adhesion failure between the FRP prestressing material 310 and the lower concrete occurs before the occurrence of the adhesion failure between the concave groove filling material and the lower concrete after yielding of the tensile reinforcing bar, A reinforced concrete structure reinforcing method for reinforcing the ductility of the concrete structure is provided. 11. The method of claim 10,
The nose 271 of the step b) is formed in the sleeve guide plate 270 so that when the compression sleeve for the FRP tension member passes through the sleeve guide plate 270, A method of reinforcing a concrete structure capable of improving ductility by using a compression sleeve forming apparatus for surface embedding FRP tension material. 11. The method of claim 10,
The sleeve guide plate 270 of the step c) advances along the sleeve guide rod 280 so that the sleeve guide plate 270 can move with straightness. The sleeve guide rod 280 is fixed at one side to the front fixing part 230, And the other side is provided so as to penetrate through the sleeve guide plate (270). A method of reinforcing a concrete structure using the pressurized sleeve manufacturing apparatus for a FRP tension member. 15. The method of claim 14,
The sleeve guide bar 280 and the sleeve guide plate 270 are secured to the surface-embedded FRP tension member for preventing the warp of the compression sleeve during the compression of the compression sleeve by the hydraulic jack 240, A Method for Reinforcing Concrete Structures with Improved Ductility Using Sleeves. 11. The method of claim 10,
The compression sleeve having passed through the swaging block 260 in step d) is compressed to have the same size as the inner diameter of the swaging block 260, and the length is increased. A Method of Reinforcing Concrete Structures with Improved Ductility Using Device. 11. The method of claim 10,
The apparatus 200 for manufacturing a press-fit sleeve for a surface-embedded FRP tension member
A hydraulic jack 240 disposed between the first and second stationary supports 210 and 220 for moving the compression sleeve for FRP tension material forward; A swaging block 260 formed on the front fixing part 230 disposed on the front surface of the second fixed support part 220 and pressing the compression sleeve for the FRP tension member; A sleeve guide plate 230 disposed between the second fixed support portion 220 and the front fixing portion 230 and movable in the direction of the front fixing portion 230 together with the compression sleeve for the FRP tension member by the hydraulic jack 240, (270); And a sleeve guide rod 280 which is fixed to the front fixing part 230 at one side and the sleeve guide plate 270 at the other side through which the sleeve guide plate 270 can move with a straight line, A method of reinforcing a concrete structure capable of improving ductility by using a press - fit sleeve forming apparatus for surface - embedded FRP tension material. A reinforced concrete structure reinforced by a concrete structure reinforcing method capable of improving ductility using a compression sleeve-forming apparatus for surface-embedded FRP tension material of claim 10. 19. The method of claim 18,
The concrete structure (400) is a concrete structure reinforced by a concrete structure reinforcing method capable of improving ductility by using a pressurized sleeve manufacturing apparatus for a surface buried FRP tension member including a bridge girder.
KR1020150126946A 2015-09-08 2015-09-08 Sleeve compressing apparatus for near surface mounted fiber reinforced polymer reinforcement and concrete structure reinforcing method for increasing ductility of concrete structure therewith KR101778002B1 (en)

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