KR101857541B1 - Post-tension Anchorage for Reduced Curvature Loss of Tendon - Google Patents

Abstract

The present invention relates to a post-tension anchorage for reducing a curvature loss of a tendon, which includes: an elliptical anchoring plate formed at the inside thereof with a wedge mounting portion coupling hole and disposed vertically; a wedge mounting portion coupled to the wedge mounting portion coupling hole, and having a conical internal passage having an inner diameter, which is enlarged from one end located at one side of the elliptical anchoring plate toward the other end located at the other side of the elliptical anchoring plate with respect to the wedge mounting portion coupling hole; a hollow cylindrical tendon passage extending from one end of the wedge mounting portion in a direction away from the wedge mounting portion and extending on a same center line as the center line of the conical internal passage of the wedge mounting portion, in which the tendon is inserted into the hollow cylindrical tendon passage; and an anchoring plate extension part horizontally extending from a lower end of the other side of the elliptical mounting plate. The center line is inclined downward by a predetermined angle from the wedge mounting portion toward the tendon passage, and the elliptical anchoring plate is horizontally cut such that a lower end of the anchoring plate, to which the anchoring plate extension part is extended, and is aligned with the anchoring plate extension part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a post-tension anchorage for reducing curvature loss of a tension member,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post-tension fixing device, and more particularly to a post-tension fixing device for reducing a loss due to a curvature of a tension member.

Generally, a prestressed concrete method is a construction method applied to the construction or civil engineering of buildings, bridges, etc., and is a means for reinforcing concrete that is weak in tensile stress by embedding a tensile material in a concrete member.

That is, by introducing compressive stress in advance to the concrete by using a tensile material before the external load is applied after completion of the structure, tensile stress is not generated in the section of the concrete even after the external load is applied, It is a construction method that only stress exists.

In a conventional reinforced concrete structure, the reinforcing bars do not function substantially until cracks occur in the concrete, but when the cracks occur in the concrete, they act as tensile reinforcements to reduce the width of the cracks. It does not function to suppress.

On the other hand, in the prestressed concrete, cracks do not occur in the concrete at first because the tensile stress is canceled by the compressive force introduced in advance, but the deflection in the reverse direction is reduced as much as the canceled load. In addition, the small cracks caused by transient overloads are soon closed by the prestress itself, so the original performance can be restored without any special measures.

The prestressed concrete method is divided into a pre-tensioning method and a post-tensioning method.

The pre-tensioning method is a method of pre-tensioning a concrete material in a predetermined position in a form, curing and curing the concrete around the concrete material, and then removing the tensile force of the material. Prestress.

In the post-tensioning method, a plurality of plastic pipes (sheath) are placed in a mold, a tensile material is inserted in the interior of the sheath, and a concrete is poured into the mold to tighten the tension material after the curing is completed. .

In such a post-tensioning method, an anchor (fixing member) and a pocket former having a fixing plate, a wedge cone, and a wedge are used as a means for fixing the end of the tension member. The fusing plate is fixed to the end of the concrete structure, and the wedge cone and the wedge are tapered to impart frictional force to the tensions, thereby allowing the wedge to hold the tensions and maintain the tense position. The pocket former is designed to form a certain space in the rear of the anchor, which is installed between the anchor and the formwork before the concrete is poured. One example of such post tension anchors is disclosed in Japanese Patent Application Laid-Open No. 10-2016-0132163 (Patent Document 1).

The prior art described in Patent Document 1 will be described in detail with reference to Figs. 1 to 3, which is a drawing related to the prior art described in Patent Document 1.

FIG. 1 is an exploded perspective view showing a coupling relationship between a post tension anchor, a pocket former and a formwork of the prior art, and FIG. 2 is a side sectional view showing a state of engagement of a post tension anchor, a pocket former and a formwork of the prior art.

The post tension anchor 1 of the prior art has an anchor main body 1 including a through hole 112 through which the tension member 2 is passed and a wedge receiving portion 113 into which the wedge 3 is inserted from the upper end and an anchor plate 114, (11) and an encapsulating portion (12) surrounding the outer peripheral surface of the anchor main body (11). The capsule portion 12 is integrally formed with an engaging portion 121 protruding a predetermined length from the upper end of the body portion 111 and an arm thread 122 is formed on the inner peripheral surface of the engaging portion 121.

A first thread 511 screwed to the female thread 122 formed on the engaging portion 121 of the capsule portion 12 is formed on the outer circumferential surface at one end and a through hole 513 may be detachably screwed to the capsule portion 12. The pocket formers 5,

The pocket former 5 is removed after concrete curing to form a predetermined pocket portion 61 at the end of the anchor. By rotating the pocket former 5 screwed to the capsule portion 12 to release the threaded connection, And the pocket former 5 is detached from the capsule portion 12.

The pocket former 5 is configured to be separable from the fixed portion 51 and the shape portion 52. The fixed portion 51 which is located inside the shape portion 52 and is not in contact with the concrete is rotated after the concrete is hardened The fixing portion 51 is separated from the encapsulating portion 12, whereby the entire pocket former 5 can be easily removed from the anchor.

3 (a) to 3 (d) are side cross-sectional views showing a process of forming a pocket portion using a post tension anchor of the prior art.

After the post tension anchor 1, the pocket former 5 and the mold 4 have been installed and the concrete 6 has been laid and cured, the second threaded portion (not shown) formed in the fixed portion 51 of the pocket former 5 The mold 4 is removed by loosening the nut 53 from the molds 512 (see Fig. 3 (b)).

3 (c), the fixing portion 51 of the pocket former 5 is rotated to separate the fixing portion 51 from the engaging portion 121 of the encapsulating portion 12, and the fixing portion 51 Is pulled backward to remove the fixing portion 51 and the shape portion 52 together. That is, when the fixing portion 51 is removed, the expanded portion 514 of the fixing portion 51 is caught by the engaging portion 522 of the shape portion 52, so that the fixing portion 51 and the shape portion 52 are removed together . As the pocket former 5 is removed, a pocket portion 61, which is a predetermined space, is formed at the end of the anchor.

Thereafter, the tension member 2 is tensed using a tension device, and the wedge 3 is inserted and fixed to the wedge receiving portion 113 of the anchor main body 11 to introduce a prestress into the member.

3 (d), the rear end of the tensile material 2 is cut to place the rear end of the tensile material 2 inside the pocket portion 61, and the encapsulation portion 12 An end cap 7 having a thread 71 formed on a part of the outer circumferential surface thereof is screwed. The end cap 7 cuts the end of the tension member 2 and seals the rear of the anchor to prevent water from penetrating into the anchor, thereby preventing corrosion of the tension member. The remaining space of the pocket portion 61 is usually subjected to grouting by a non-shrinkage mortar filling method to finish a uniform surface integrated with the end of the concrete structure.

When tensioning the tension member by the post tension anchor, the tension member should be given a uniform tensile force. Accordingly, the fixing plate of the anchor is usually installed such that the direction of the arrangement of the tension member and the fixing section of the concrete structure are orthogonal to each other. It is also shown in Figs. 2 and 3 which are drawings related to the prior art.

However, a significant amount of initial tensioning material deflection may occur due to the weight of the tensioning material, and such tensioning material may be combined with a post tension anchor of the prior art, which is installed so that the anchor fixing plate is orthogonal to the placement direction of the tensioning material and the fixing cross- , One or more sections where the tension member is bent unnecessarily (refer to FIG. 4). Such bending of the tensions may cause a loss of curvature of the tensions, which may cause the tensile forces not to be evenly distributed throughout the tensions.

Publication No. 10-2016-0132163 (published on November 17, 2016) " Post tension anchor "

SUMMARY OF THE INVENTION It is an object of the present invention to provide a post tension fixing device capable of reducing a curvature loss by preventing an unnecessary warp in a tension member despite deflection of a tension member.

Another object of the present invention is to provide a post tension fixing device capable of preventing a concrete structure from being damaged by a vertical component of a tensile force due to a deflection of a tension member.

According to an aspect of the present invention, there is provided a post tension fixing device for reducing a tangential curvature loss according to the present invention, comprising: an elliptical fixing plate vertically disposed with a wedge seating portion coupling hole on an inner side thereof; And a conical large-sized inner passage coupled to the wedge seating portion coupling hole and having an inner diameter expanded from one end of the elliptical fixing plate located at one side of the elliptical fixing plate toward the other end located at the other side of the elliptical fixing plate, A wedge seating part; A hollow cylindrical prestressing passage extending from the one end of the wedge seating portion in a direction away from the wedge seating portion and extending over a centerline coinciding with a centerline of the cone large internal passage of the wedge seating portion and inserted therethrough; And a fuselage plate extension part horizontally extending from the lower end of the other side of the elliptical fusing plate, wherein the center line is formed so as to be inclined downward by a predetermined angle from the wedge seat part toward the strainer passage, The fixing plate is formed in a shape cut horizontally such that the lower end of the fixing plate extension portion is aligned with the fixing plate extension portion.

In one embodiment, the wedge receiving portion may further include a pocket former coupled portion extending from the other end of the wedge receiving portion and having an outer diameter smaller than the other end of the wedge receiving portion.

In another embodiment, the wedge receiving portion may further include a pocket former coupled portion extending from the other end of the wedge receiving portion and having an inner diameter larger than the other end of the wedge receiving portion.

The wedge receiving part may further include an auxiliary supporting part formed outside the one end of the wedge receiving part, the auxiliary supporting part being formed such that an outer diameter thereof gradually increases from the wedge receiving part toward the channel.

Furthermore, a male anchor is formed at the distal end of the trenched passage, is fitted around the outer periphery of the end of the tender, is formed of a soft material, and is formed in one side to be in close contact with the covering of the tough material, And a sleeve having an internally threaded portion formed on the other side of the sleeve, the sleeve being able to be coupled to the male thread of the tension member passage.

According to the post tension fixing device for reducing the torsional curvature loss according to the present invention, even when a significant initial deflection occurs during the introduction of the torsion material, the curvature loss caused by the torsion material and the uneven tensile force distribution of the torsion material caused thereby can be minimized It has excellent effect.

In addition, there is an advantage that the damage of the concrete structure due to the vertical component of the tensile force that can be applied to the post tension fixing device due to the deflection of the tension member can be prevented.

1 is an exploded perspective view showing a coupling relationship between a post tension anchor, a pocket former and a formwork of the prior art.
2 is a side cross-sectional view showing a state of engagement of a post tension anchor, a pocket former, and a die in the prior art.
3 is a side cross-sectional view showing a process of forming a pocket portion using a post tension anchor of the prior art.
4 is a schematic view showing a state in which warpage occurs in a tension member as an example of a tension member using the post tension anchor of the related art.
5 is a perspective view of an embodiment of a post tension fixing device for reducing a torsional curvature loss according to the present invention.
6 is a side view of an embodiment of a post tension fixing device for reducing a torsional curvature loss according to the present invention.
7 is a front view, a side view, and a side sectional view of a post tension fixing device for reducing a torsional curvature loss according to the present invention.
8 shows another modification of the post tension fixing device for reducing the torsional curvature loss according to the present invention.
Figure 9 is an illustration of an example of angular variation of a tie for calculation of curvature loss of a tie.
10 is a view showing a change in angle of a tension member when a tension member roll is introduced using a conventional post tension fixing device.
11 is a view showing a change in angle of a tension member when a tension member is introduced using a post tension fixing device for reducing a torsional curvature loss according to the present invention.
FIG. 12 is a schematic view showing an example of the application of the tension member using the post tension fixing device for reducing the torsional curvature loss according to the present invention.

Hereinafter, a post tension fixing device for reducing a torsional curvature loss according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a perspective view of an embodiment of a post tension fixing device for reducing a torsional curvature loss according to the present invention, and FIG. 6 is a side view.

The post-tension fixing device for reducing the tangential curvature loss according to the present invention includes an elliptical fixing plate 600, a wedge seating portion 700, a tension member passage 800, and a fixing plate extension portion 690.

The elliptical fixing plate 600 is provided so as to disperse the pressure according to the tensile force of the tension member into the concrete structure. The outer edge of the elliptical fixing plate 600 is formed in an approximately elliptical shape and the wedge seating part coupling hole 610 is formed in the inner side. The elliptical fixing plate 600 does not have to be rigidly elliptical in geometric sense but may have a generally elliptical shape with a straight line section along the outer rim except for the fixing plate extension portion 690 described later, As shown in FIG.

One of the reasons why the fusing plate is formed in an elliptical shape in the post-tension fixing device according to the present invention is that, in the case of a roughly rectangular fixing plate of the prior art (see Patent Document 1), the corner portion acts as a singular point where stress is concentrated, This is to compensate for the fact that cracks often occur in the concrete of the concrete, thereby allowing moisture penetration and causing corrosion of the reinforcing steel.

In a case where a plurality of fixing ports, that is, fixing devices are arranged side by side in the lateral direction, when the plurality of fixing holes are arranged in a vertically long shape so that the elliptical fixing plate 600 has the same supporting area There is an advantage that it is possible to further reduce the arrangement interval of the fixing holes as compared with the fixing holes having circular circular fixing plates. The spacing of the fixing holes can be made narrower, so that a larger number of fixing holes can be provided for the same concrete structure, which means that the effect of the prestress by the post tension fixing holes can be maximized.

The wedge seating portion 700 is coupled to the wedge seating portion coupling hole 610 of the elliptical fixing plate 600 and is disposed on one side of the elliptical fixing plate 600 with respect to the wedge seating portion coupling hole 610 And a conical large internal passage 710 having an inner diameter expanded from the one end 720 toward the other end 730 located on the other side of the elliptical fixing plate 600.

The cone-shaped internal passageway 710 of the wedge seating portion 700 has a wedge (not shown) having an approximately cylindrical prong passage hole through which a tension member T can pass, A wedge holding the tension member in the through hole is tapered to the wedge receiving portion 700 so that a frictional force is applied to the tension member so that the tension position of the tension member can be maintained.

The tongue passage 800 is formed in a hollow cylindrical shape and extends from the one end portion 720 of the wedge seating portion 700 in a direction away from the wedge seating portion 700. Preferably, the tautomeric channel 800 is formed such that the centerline 860 of the tongue channel 800 is aligned with the centerline 760 of the conical large internal channel 710 of the wedge seating portion 700. The tension member T is inserted and passed from the distal end of the tongue passage 800 to the inside of the tongue passage 800 and the tongue T is again passed through the cone large internal passage 710 of the wedge seating portion 700. The tension member T passed through the tongue passage 800 and passed through the conical large internal passage 710 of the wedge seating portion 700 is inserted into the wedge seating portion 700 through a wedge The tension position can be maintained.

The center line, that is, the center line 860 of the trenched material channel 800 and the common center line 760 of the cone-shaped inner channel 710 are connected to the tangent passage 700 through the wedge- 800) by a predetermined angle. The inclination angle can be selected in the range of angles calculated considering the design of the concrete structure in which the post tension fixing device according to the present invention is to be installed.

In the illustrated embodiment, the wedge seating portion 700 extends from the other end portion 730 of the wedge seating portion 700 and has an inner diameter larger than the other end portion 730 of the wedge seating portion 700 And may further include a pocket former engagement inner diameter portion 740. The pocket former combined inner diameter portion 740 can be formed with various coupling structures, for example, female threads (not shown) that can be combined with a male thread formed on the pocket former, whereby the pocket former (Not shown) can be fixedly coupled to the post tension fixing device according to the present invention. One example of such a pocket former coupling method is disclosed in Patent Document 1 mentioned in the Background Art section, and accordingly, the description of Patent Document 1 is considered to constitute a part of this specification.

In the illustrated embodiment, the post-tension fixing device according to the present invention is a member that allows the fixing device to disperse the pressure according to the tension of the tension material into the concrete structure, and besides the elliptical fixing plate 600, the auxiliary supporting portion 770 Ribs. ≪ / RTI > The auxiliary support portion 770 is formed outside the one end portion 720 of the wedge seating portion 700 and is formed so that the outer diameter gradually increases toward the tongue passage 800 from the wedge seating portion 700. The auxiliary supporting portion 770 primarily serves to disperse the pressure of the tension member supported by the elliptical fixing plate 600 into the concrete structure, thereby contributing to the structural integrity of the post tension fixing device according to the present invention. .

Since the elliptical fixing plate 600 is embedded in the concrete in a vertical state, it supports the horizontal component of the tensile force, and the auxiliary support 770 is embedded in the concrete in an oblique state with neither horizontal nor vertical. Therefore, It can support both of the components.

Hereinafter, the support of the tensile force (T) will be described in more detail.

An example of when the post-tension fixing device according to the present invention is applied to a concrete structure is shown in Fig. 12, wherein the conical large internal passage 710, the tangential passage 800, etc. of the fixing device of the present invention are as described above In consideration of the initial amount of deflection of the tensile member T, the center axis thereof is inclined downward by a predetermined angle. Accordingly, the tension member T is coupled to the post tension fixing device of the present invention at a predetermined angle, not horizontal, as shown in Fig. Accordingly, the tension applied to the fixing device of the present invention by the tension member T coupled to the fixing device at a predetermined angle other than horizontal can be divided into a vertical component and a horizontal component.

The horizontal component force can be supported by the elliptical fixing plate 600 and the auxiliary support 770 of the post-tension fixing device according to the present invention, as described above.

The vertical force can be partially supported by the auxiliary support 770, but additional configuration may be needed for sufficient support of the vertical force. Accordingly, the post-tension fixing device according to the present invention is provided with a structure capable of supporting the vertical component force, and in the illustrated embodiment, the fixing plate extending in the horizontal direction at the lower end of the elliptical fixing plate 600 And the vertical force can be sufficiently supported by providing the portion 690.

The fixing plate extension portion 690 extends horizontally from the lower end of the elliptical fixing plate 600 so that the elliptical fixing plate 600 is positioned such that the lower end of the fixing plate extension portion 690, And is formed in a shape cut horizontally so as to coincide with the portion 690. That is, the portion of the elliptical fixing plate 600 where the fixing plate extension portion 690 is formed is formed as a straight line, and the other portions are all formed as curved lines forming part of an elliptical or elliptic curved line.

The fusing plate extension 690 is preferably located on the other side of the elliptical fusing plate 600, that is, opposite to the torsion channel 800. This is to facilitate the manufacture of the post tension fixing device according to the present invention.

A modification of the post tension fixing device for reducing the torsional curvature loss according to the present invention will be described below.

7 is a front view, a side view, and a side sectional view of a post tension fixing device for reducing a torsional curvature loss according to the present invention. It should be noted that FIG. 7 shows the front view rotated counterclockwise by 90 degrees in order to show the front view, the side view, and the side sectional view in conjunction with each other.

The modified embodiment shown in Fig. 7 is similar to the previous embodiment, but differs in several respects. First, the present modification does not include the auxiliary supporting portion 770. [ The outer diameter portion of the wedge seating portion 700 of this modification is formed into a substantially truncated cone shape similar to the cone-shaped internal passage 710. The post-tension fixing device according to this modified example thus formed has an advantage in that the material required for manufacturing the fixing device can be saved as compared with the previous embodiment.

7, the wedge receiving portion 700 may extend from the other end portion 730 of the wedge receiving portion 700 and have an outer diameter larger than an outer diameter of the other end portion 730 of the wedge receiving portion 700 And a pocket-shaped mating outer diameter portion 750 formed to be smaller than the outer diameter portion. The pocket former combined outer diameter portion 750 may be formed by forming a male screw thread on the outer diameter portion, for example, so that a pocket former (not shown) formed with a female screw thread can be engaged.

8 shows another modification of the post tension fixing device for reducing the torsional curvature loss according to the present invention.

The post tension fixing device according to the present invention may further include a sleeve 900 to prevent the water penetrated into the concrete from permeating the strand forming the tensile material T to corrode the strand. The sleeve 900 is fitted around the outer periphery of the end of the tension member T and is formed of a soft material. A wastewater film 913 is formed in one side 910 of the sleeve 900 so as to be in close contact with the covering of the tension member T to prevent water infiltration and is provided inside the other side 920 at the distal end of the tension member passage 800 A female thread 923 can be formed which can be coupled to the male threaded tooth 830 formed.

As shown in the figure, annular protrusions protruding along the inner circumference of the sleeve 900 are continuously disposed along the longitudinal direction of the sleeve 900, Shape. ≪ / RTI >

The annular projection 913 is formed of a soft material so that the annular projection 913 can be in close contact with the covering of the tension member T. The annular protrusion 913 is formed of a soft material, Is formed so as to have a finer inner diameter than the outer diameter of the sheath of the cover.

On the other hand, the female thread 923 is watertightly coupled with the male screw thread 830 to form a wrist strap itself.

The post tension fixing device according to the present invention can be integrally manufactured as a whole. For example, in the post-tension fixing device according to the present invention, after a primary manufacturing process is performed by casting or the like, in the case of a portion requiring precision machining, such as the conical large internal passage 710 or the inner peripheral portion of the tangential passage 800, It can be made through machining.

In addition, the post-tension fixing device according to the present invention can be provided with a coating film for preventing corrosion or a housing (not shown) formed to surround the entire fixing device. An example of such a housing is described in Patent Document 1 mentioned in the Background Art section.

Hereinafter, the reduction of the curvature curvature loss by the post-tension fixing device according to the present invention will be described with reference to the accompanying drawings.

FIG. 9 is a view showing an example of an angle change of a tension member for calculation of a curvature loss of a tension member, FIG. 10 is a view showing an angle change of a tension member when a tension member roll is introduced using a conventional post tension fixing device, FIG. 11 is a view showing an angle change of a tension member when a tension member is introduced by using a post tension fixing device for reducing a torsional curvature loss according to the present invention, and FIG. 12 is a cross sectional view of a post tension fixing device for reducing a tension member curvature loss according to the present invention. Fig. 2 is a schematic view showing an example of the construction of a tightening material using

Typically, the amount of prestress loss in the design of structures is often estimated by reference materials rather than rigorous calculations. An example thereof is shown in Table 1 below. Table 1 shows the approximate prestress loss values according to the design standards for the highway bridges.

Form of tension Loss due to compressive strength of concrete (MPa)

 Pretension tension - 315  Post tension wire and strand 225 230  Post tension bar 155 160

In the post-tensioning method, the tensile strength of the PS steel decreases as the distance between the PS steel and the sheath increases. This reduction is called loss due to friction. The friction occurs inside the jack and also inside the fixing device, but the loss due to such friction is negligibly small. However, the amount of loss due to the friction between the sheath and the PS steel is very large, so proper remedial measures are required.

PS Loss of tensile force due to friction between steel and sheath is caused by two causes. In other words,

1) Loss by Curvature Effect of Tension Material = Curvature Friction

2) Loss due to the length effect of PS steel (Wobble Friction)

)을 2016년 도로교설계기준에 따라 나타낸 것이 아래 수학식 1이다(도 9 참조).Such tensile loss due to friction (

) Is shown in accordance with the design standard of the bridge in 2016 as follows (see FIG. 9).

here,

: 인장단으로부터 거리

인 곳에서의 긴장재의 인장력

: Distance from tensile end

Tensile strength of tensile material in

: 인장단(잭의 위치)에서의 긴장재의 인장력

: Tensile strength of tensile material at tensile end (position of jack)

: 각변화 1 radian에 대한 곡률 마찰계수(Curvature Coefficient)

: Curvature Coefficient for each change 1 radian (Curvature Coefficient)

: 각변화(radian)

: Angular variation (radian)

: 긴장재의 길이 1 m에 대한 파상 마찰계수(Wobble Coefficient)

: Wobble Coefficient for 1 m length of tension

: 인장단으로부터 생각하는 단면까지의 긴장재의 길이

: Length of the tension from the tensile end to the section considered

A comparison of the case of introducing the tension member of the post tension fixing device according to the related art and the case of introducing the tension member of the post tension fixing device according to the present invention will be described below based on the above equations.

10 and 11, by changing the initial introduction angle to be parallel to (or contact with) a curve as in the present invention (Fig. 11) from horizontal as in the prior art (Fig. 10) It is possible to reduce the angle change at each end of the tension member by one time, thereby reducing the loss of tensile force due to friction. This can be expressed by the following formulas (2) to (4). Variable values according to the present invention are distinguished by superscript *.

Considering that the tensile force of the PS steel is maximized at the ends of the tensile member due to the above-mentioned friction in the post tension system, the loss of the tensile member can be effectively reduced by the post tension fixing apparatus according to the present invention.

An example of a concrete structure in which the post-tension fixing device according to the present invention is installed is shown in FIG. The method of constructing the post tension fixing device according to the present invention is similar to that of the fixing device according to the prior art, and can be applied, for example, in a manner similar to that shown in FIG.

The present invention can be utilized to optimize the tensional force of the tensions introduced into the building, and it is easy to satisfy the design standard that does not take into consideration the strand introduced horizontally through the tires, and the process of introducing the additional tensions in consideration of the loss There is an excellent effect that it is possible to improve the workability with a technique that can be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited thereto and that the scope of the present invention is not limited thereto. It should be noted that the present invention is defined only by the description of the following claims.

600: elliptical fixing plate 610: wedge seating part bonding hole
690: Fixing plate extension part 700: Wedge seat part
710: cone large inner passage 720: one end of the wedge seating part
730: wedge seating part, other end part 740: pocket former coupling inner neck part
750: Pocket former combination outer diameter 760: Wedge seat center line
770: Auxiliary support 800: Tension passage
830: male screw mount 860: taut passage center line
900: Sleeve 913:
923: Female thread T: Tension material

Claims (5)

A post tension fixing device for a concrete structure using a tension member,
An elliptical fusing plate disposed vertically with a wedge seat fitting hole inside;
And a conical large-sized inner passage coupled to the wedge seating portion coupling hole and having an inner diameter expanded from one end of the elliptical fixing plate located at one side of the elliptical fixing plate toward the other end located at the other side of the elliptical fixing plate, A wedge seating part;
A hollow cylindrical prestressing passage extending from the one end of the wedge seating portion in a direction away from the wedge seating portion and extending over a centerline coinciding with a centerline of the cone large internal passage of the wedge seating portion and inserted therethrough;
A fixing plate extension unit horizontally extending from a lower end of the other side of the elliptical fixing plate; And
An auxiliary support portion formed outside the one end of the wedge seating portion and formed to gradually increase in outer diameter from the wedge seating portion toward the tension member passage;
, ≪ / RTI >
Wherein the center line is formed so as to be inclined downward by a predetermined angle from the wedge seating portion toward the tensional material passage,
Wherein the elliptical fixing plate is formed in a shape that is horizontally cut so that a lower end of the fixing plate extension portion is aligned with the fixing plate extension portion,
The horizontal component of the tension force applied to the fixing device by the tension member coupled at the predetermined angle other than horizontal may be determined by the elliptical fixing plate buried in a state perpendicular to the concrete structure and the elliptical fixing plate inclined downward Supported by the auxiliary support embedded in the concrete structure,
The vertical component of the tension force applied to the fixing device by the tension member is partially supported by the auxiliary support embedded in the concrete structure in an oblique state and the fusing plate extension portion extending horizontally at the lower end of the other side of the elliptical fusing plate Wherein the post tension fixing device is further supported by the support member. The method according to claim 1,
Further comprising a pocket former combined diameter portion extending from the other end of the wedge receiving portion and having an outer diameter smaller than the other end of the wedge receiving portion. The method according to claim 1,
Further comprising a pocket former coupling inner diameter portion extending from the other end of the wedge receiving portion and having an inner diameter larger than the other end portion of the wedge receiving portion. delete The method according to claim 1,
A male screw acid is formed at the distal end portion of the strained material passage,
A water receiving layer formed on the outer periphery of the end portion of the tension member and formed of a soft material and closely contacting the coating of the tension member to prevent water infiltration therein and being coupled to the inner thread of the tension member passage And a sleeve having a female screw thread formed thereon.

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