KR101766213B1 - Mono tendon anchorage unit using saddle and the construction method therefor - Google Patents

Abstract

The present invention relates to a mono tendon anchorage unit using a saddle and a construction method thereof, wherein tendons are independently guided by a saddle, and are simply fixated to and installed in both end portions of a girder. Therefore, construction properties are excellent, and without an additional anchorage port in the girder, prestress is introduced to make better use of an anchorage space. Each of the tendons is tensioned and anchored by a mono anchorage port installed in the mono tendon anchorage unit so as to anchor each of the tendons in each of the mono tendon anchorage unit after being tensioned.

Description

Technical Field [0001] The present invention relates to a monotender fixing device using a saddle portion,

The present invention relates to a monotender fixing device using a saddle portion and a method of manufacturing the same. More specifically, the present invention relates to a monotender fixing device using a saddle portion, The present invention relates to a monotender fixing device using a saddle portion, which is very advantageous in utilizing a fixing space, and a method of mounting the monotender fixing device.

In general, prestressed concrete (PSC) is a structure that can increase the strength and stiffness of concrete girder or beam by compressing the lower tension zone of the section by applying linear compressive force to the concrete with weak tensile strength.

That is, concrete that has been subjected to compressive stress in advance to compensate for the tensile stress occurring in the concrete is fixed to concrete by tensioning the tendons (Tendon, PC steel wire, PC steel wire, PC steel, etc.) The above-described PSC structure overcomes the drawbacks of the reinforced concrete structure that is susceptible to tensile and reduces the thickness of the reinforced concrete structure.

US Patent No. 8,104,246 discloses a fixture for fixing the tendon, and Korean Patent No. 10-0696646, Patent No. 10-1439734, and Patent No. 10-0691848 disclose a tendon fixation structure.

In the PSC structure, if the tension of the tendon is released or the tensioned tensile is broken, the compressive stress applied to the concrete is removed, thereby causing a problem in structural stability. In order to maintain the tensile force of the tendon, the fixing device embedded in the concrete, Plays a very important role. That is, the restraining force of the concrete of the fixing device can be obtained by coupling the supporting plate to the fixing device.

However, there is a problem in that the tie plate is constrained by the tie plate, and therefore, the cross-sectional size of the tie plate must be increased for stable tension, and if the tensile force of the tie plate is applied to the tie plate, cracks are generated in the concrete by the tie plate .

In addition, when the tensile force is applied, the fixing device is embedded in the concrete after the introduction of the tensile force, and when the tent is broken or the tensile force is reduced during the use of the bridge, replacement and additional tensile force are difficult to be introduced.

[Patent Document 1] U.S. Patent No. 8,104,246 B2 Issued on Jan. 31, 2012 [Patent Document 2] Korean Patent No. 10-0696646 Issue Date 2007. 03. 20 [Patent Document 3] Korean Patent No. 10-1439734 Notification Date 2014.09.17 [Patent Document 4] Korean Patent No. 10-0691848 Issue Date 2007. 02. 12

Accordingly, the present invention has been made to solve the above problems

It is an object of the present invention to provide a method and apparatus for tensioning and fixing a tension member in a state in which tendons are individually arranged at a fixing position of a structure without causing the end portions of the tension member to be fixed through a pressure plate embedded in the girder, And to provide a monotender fixing device using the saddle portion capable of enhancing the efficiency of introducing a prestress by a tension member and a method of constructing the same.

According to an aspect of the present invention,

A saddle portion spaced apart in the longitudinal direction on the bottom surface of the girder and having a tension member guide portion penetrating through the tension member and guided in the longitudinal direction; And a monotender fixing device arranged vertically at upper ends of both ends of the girder so as to allow both ends of the tensioned material passing through the tensioned guide to pass therethrough and to be fixed after being tensed, In order to fix the mono-tone fixing device, a mono fixing port provided inside the mono-tension fixing device is used. The mono fixing port is a fixing port inserted into the fixing block portion of the mono-tension fixing device, Wherein the saddle portion is a beam extending transversely to the bottom surface of the girder, the saddle portion of the saddle portion being a beam extending transversely to the bottom surface of the girder, A lateral beam extending so as to protrude from both sides of the girder; And a tension member guide portion, wherein the transverse beam is formed so that a tension member guide portion is penetrated through the abdomen to guide the tension member, the tension member guide portion is formed as a circular pipe and the tension member passes through the longitudinal pipe; An end cap which is fitted to both ends of the longitudinal tube and in which an elongate material passage hole is formed so that the elongate material passes through the longitudinal tube through the elongate material passage hole; And a filling material filled in the longitudinal tube such that a strand tube installed to connect the tension chamber through holes of the end cap 224 is inserted into the longitudinal tube so that the tension material passes through the strand tube fixed by the filling material The present invention provides a monotender fixing device using a saddle portion.

Further,

(a) a saddle portion having a tension member guide portion formed to be longitudinally spaced from the bottom surface of the girder so as to be guided in a longitudinal direction through the tension member, and a plurality of upper and lower saddle portions arranged vertically at both ends of the girder, Providing a monotender fixing device for allowing both ends of the tension member to pass through and to be fixed after tension;

(b) filling a filler material in the tensile material guide so that the strand tube installed to connect the tensile material through holes of the end caps constituting the tensile material guide part to each other;

(c) allowing the tension members to pass through the strand tube of the tension member guide portion formed in the saddle portion and then extending both ends of the tension member to the monotense fixing device;

(c) setting the ends of the strap to pass through an extended sheath and a mono fixing port provided in a prism guide hole of a monotender fixing device, respectively, and end portions of the prong are inserted into the fixing wedge;

(d) fixing the wedge to the fixing port of the mono fixing unit after the tension member is tensed using the tension jack in the inner middle seat (S) of the monotense fixing apparatus; And

and (e) injecting the grout through an injection tube formed in the monotender fixing device. The present invention also provides a method of installing a monotender fixing device using a saddle portion.

The present invention is characterized in that each tension member end extending to both ends of a girder is fixed to a mono fixing member provided on the side of a girder through a tension member guide portion constituting a saddle portion provided on a bottom surface of a bridge constituting a bridge, It is possible to adjust the alignment (tension material installation angle).

In addition, the saddle portion can be disposed by the intermediate fixation in parallel with the lower portion of the girder, thereby improving the introduction efficiency of the prestress.

1 is a front view and an end view of a girder provided with a monotender fixing device using a saddle portion according to the present invention;
2 is a cross-sectional view of the saddle portion of the present invention,
Fig. 3 is an installation sectional view of a tension member guide portion and a tension member constituting a saddle portion of the present invention,
4 is a structural coupling diagram of a tension member guide portion constituting a saddle portion of the present invention,
5 is a perspective view of the monotender fixing device of the present invention.
FIG. 6 is a view showing the installation of a fixing port provided in the monotender fixing device of the present invention,
Figs. 7 and 8 are a wedge-installed perspective view and a wedge configuration diagram of the monotense fixing device 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.

[Monotender fixing device 300 using saddle portion 200]

The monotender fixing device 300 according to the present invention includes a saddle portion 200 having a tension member guide portion 220 which is disposed in plurality on a girder 100 forming a bridge and guides a plurality of strands of the tension member 350 in a bundled form And a plurality of monotense fixing devices 300 that are vertically arranged and fixed on the side surface of the girder 100 while tensing the both ends of the tension member 350 passing through the tension member guide unit 220.

1, the girder 100 is mounted on an upper surface of a bridge pier (alternatively, can be alternatively used as a bridge lower structure) through a bridge support, and the bridge 100 is connected to a bridge A slab 110 constituting an upper plate is formed.

That is, a plurality of girders 100 are arranged along the longitudinal direction of the bridge in a direction in which the slabs 110 are slid on the bottom surface of the slabs 110 (transverse direction at right angles to the throttling direction).

As shown in FIG. 1, the tension member 350 provides tension to the girder 100 in the longitudinal direction. The tension member 350 is a wire made of a metal material. A plurality of strands of wires are bundled together to form a tension member. The coating 351 is shown but not shown separately, and is illustrated in FIG.

The monotender fixing device 300 is configured to guide the tension member 350 to the bottom of the central portion of the girder 100 and to fix both ends of the saddle 200 to both ends of the girder 100 after tensioning. .

That is, the monotender fixing device 300 in which the plurality of tension members 350 pass through the tension member guide unit 220 of the saddle portion 200 and the both ends thereof are arranged in plural, And are settled after tension on both end sides individually.

2, the saddle portion 200 may be integrally formed on the bottom surface of the girder 100. The saddle portion 200 may be integrally formed with the girder 100 in a longitudinal direction (longitudinal direction, throttling direction) of the girder 100 forming the bridge (Lateral direction) perpendicular to the throat axis.

In FIG. 1, two spaced apart from each other in the longitudinal direction and the transverse direction are disposed on the bottom surface of the girder 100. As shown in FIG. 2, It can be seen that they are spaced apart.

As shown in FIG. 3, the saddle portion 200 includes a tension member guide 220 to guide the tension member in the longitudinal direction.

The position of the tension member guide unit 220 may be determined such that the tension member 350 passing through the tension member guide unit 220 can be deployed on both sides of the girder 100. [ 100 in the longitudinal direction.

When the monotender fixing device 300 is disposed on the opposite end sides of the girder 100, the tension member 350, to which both end portions are fixed after being tensed to the monotender fixing device 300, Since the tension member guide unit 220 is set to the position of the tension member in order to guide it.

As shown in FIGS. 3 and 4, the saddle portion 200 includes the lateral beam 210 and the tension member guide portion 220.

First, it is understood that the transverse beam 210 is a beam extending in the lateral direction on the bottom surface of the girder 100, and an I-shaped steel beam is used in FIG. Thus, the transverse beams 210 are extended so as to protrude from both sides of the girder 100.

In order to guide the tension member 350, the tension member guide unit 220 is formed to pass through the abdomen. The monotender fixing unit 300 is provided with one tension member and a plurality of tension members are arranged to pass through the tension member guide unit 220 do.

3 and 4, the tension member guide portion 220 includes a longitudinal tube 222, an end cap 224, and a filler material 226. [

First, the longitudinal tube 222 is formed as a circular tube, and it can be seen that the tensile material 350 penetrates into the inside of the longitudinal tube 222,

End caps 224 are fixed to both ends of the longitudinal tube 222, respectively.

It is to be noted that the end cap 224 is formed with a plurality of through holes 223 to allow the tension to penetrate the longitudinal tube 222 via the through holes 223, It can be seen that the position is guided.

3, the strand tube 225 is filled with the filling material 226 filled in the longitudinal tube so that the strand tube 225 is embedded in the strand tube 225 so as to connect the through holes 223 of the end cap 224, So that the tension member can penetrate through it.

1 and 5, the monotender fixing device 300 includes a plurality of vertically arranged upper and lower end portions of both sides of the girder 100 of the bridge, And is fixed to the girder 100 in a tense state.

It can be seen that the monotender fixing device 300 in which the tension member 350 is fixed after the tension is advantageous to the flexure reinforcement of the girder 100 and is arranged in a parabolic shape in the girder 100. This is because, And is disposed in a parabolic shape passing through both ends of the girder 100 and the lower part of the center portion.

When the monotender fixing device 300 is installed using the saddle 200, it is very advantageous to arrange the tension members in parallel at the center of the girder 100, and the amount of the tension members The inclination angles of the end portions can be adjusted individually, which makes it possible to reinforce the girder 100 efficiently.

5, the monotender fixing device 300 includes a middle body portion 330 having an inner heel S formed between the fixing block portion 310 and the fixing block portion 320, And a mono fixing unit 340 mounted inside the fixing unit.

At this time, the tension member 350 is inserted into the tension member guide hole 321 of the fixing block unit 320 and is fixed after being strained by the wedge 360 of the mono fixing member 340.

5, the fixed block unit 310 is a block unit fixed to a side surface of the girder 100 through a fastener 312 such as a fixed anchor.

The fixing block 320 includes a tension member guide hole 321 through which a mono fixing hole 340 can be mounted. So that the mono fixing hole 340 is formed to have a somewhat thick thickness.

The middle trunk part 330 includes a fixed block part 310 spaced apart from the fixing block part 310 and a fixing block part 320 so that the tension jack can be installed, (S) is formed in the form of a horizontal plate. So that the tension member guide hole 321 is exposed to the inner heavy member S.

The mono fixing hole 340 has a circular tube-shaped fixing port 341, a wax cap 342, an inner connecting tube 343, a close cap 344, a duct 345, a connecting nut 346, A cap nut 347, and an injection tube 358.

The fixing port 341 is inserted into the rear end A of the tension member guide hole 321 so that the wedge 360 having the bent portion 350 formed thereon can be fixed to the inner surface of the fixing port 341, 341 is partially exposed to the inner heavy seat S and is supported at the inner end of the tongue guide hole 321. The rear end of the tongue guide hole 321 is extended to a certain depth. At this time, the inner surface of the tension member guide hole 321 is formed with threads or the like so that the fixing port 341 can be fixed to the tension member guide hole 321, thereby securing frictional force.

The wax cap 342 is inserted into a nipple groove in the form of a vertical groove communicating with the tension member guide hole 321 in the approximate middle of the fixing block portion 320 so as to prevent the wax (grease) For preventing leakage of the wax for preventing corrosion of the fixing port and the portion of the tension member in which the cover is peeled off.

The inner connection tube 343 is a hollow tube provided with a rubber ring to prevent the grout from leaking to the fixing port 341 side (left side in FIG. 6) of the wax cap 342, It can be seen that the inner connecting tube 321 is also extended (with respect to the diameter by which the tension member can be inserted), and the tension member 350 penetrates through the inner connecting tube 343.

The cap 344 is fixed to the duct 345 as a cap member inserted into the tension member guide hole 321 at the rear end C of the fixing block on the opposite side of the fixing port 341, The tension member 350 is passed through.

The duct 345 is a tubular member that is installed to be inserted into the tension member guide hole 321 by being guided by the tension member 350 to the fixing block unit 320 and is fixed to the close cap 344, It does not prevent damage.

The connection nut 346 is a rotary nut that connects the inner connection tube 343 and the sheath 351 to each other in the tension member guide hole 321.

The cap nut 347 is a nut member that connects the close cap 344 and the duct 345 and is installed in the close cap 344 between the inside of the rear end and the circumferential surface of the duct.

The injection tube 348 serves as a grout injection tube formed above the connection nut 346 to inject the grout material.

This causes the tension member 350 to pass through the cap nut 347 and the tightening cap 344 through the duct 345 and extend to the fixing port 341 via the inner connecting tube 343, 360 so that the wedge 360 is fixedly fixed within the fixing port 341 after the tension.

After completion of the fixing, the grout is injected to the rear side of the connection nut 346 through the injection tube 348 and injected into the cover 351.

7 and 8, the wedge 360 is installed on an inner inclined surface of the fixing port 341 to fix the tension member 350. [ The wedge 360 is positioned on the outer side of the tensile member and includes a plurality of wedge pieces 361, 362, and 363, which are not shown but are covered with a beam groove cap.

[Construction method of monotender fixing device 300 using saddle portion 200]

The on-site installation process of the monotender fixing device 300 according to the present invention will now be described.

First, in the case of the monotender fixing device 300, the fixing device 300 may be coupled to both sides of the girder 100 to be installed as shown in FIGS. 1 and 5 through fastening holes 312 in the directions opposite to each other. At this time, it may be installed directly on the upper end side of the end portion of the girder 100.

In the case of the saddle portion 200, as shown in FIGS. 1 and 2, the tension member guide portion 220 is coupled and fixed to penetrate the lateral beam 210 of the saddle portion 200, (200) are provided on the bottom of the central portion of the girder (100) forming the bridge.

The saddle portions 200 may be spaced apart from each other in the longitudinal direction on the bottom surface of the girder, but may be installed in the lateral direction as shown in FIG.

The filler 226 is filled in the longitudinal tube so that the strand tube 225 installed to connect the tension member through holes 223 of the end cap 224 of the tension member guide unit 220 is embedded.

Next, the tension member 350 is passed through the strand tube 225 of the tension member guide unit 220 formed on the saddle portion 200, and the both ends of the tension member 350 are respectively connected to the monotender fixing apparatus 300 . At this time, both ends of the tension member are peeled off the cover 351.

The ends of the tension member 350 are respectively passed through the duct 345 and the mono fixing holes 340 provided in the tension member guide holes 321 of the monotender fixing device 300 and the ends are fixed to the fixing port 341, So that the wedge 360 is inserted into the wedge 360.

Next, the wedge 360 is firmly fixed to the fixing port 341 after the tension member 350 is tensioned by using the inner heavy thread S of the monotender fixing device 300 using the tension jack.

And the grout is injected through the injection tube 348 formed above the connection nut 346.

The tension member 350 is arranged to be inclined downward from both ends of the girder 100 toward the center of the girder and the tension members are arranged in parallel by the plurality of saddle portions 200 to enhance the effect of introducing the prestress by the tension member 350 It can be seen that

Further, according to the present invention, since the mono fixing hole 340 for fixing the end portion of the tension member on the side of the bridge constituting the bridge independently tightens the tension member, the alignment adjustment (angle of rotation of the tension member) can be facilitated.

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

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

100: girder 110: slab
200: saddle portion 210: transverse beam
220: tension member guide part 222: longitudinal tube
223: Tension material through hole 224: End cap
225: Strand tube 226: Filler
300: monotender fixing device
310: fixed block portion 312: fastener
320: Fixing block part 321: Tension material guide hole
330: Middle body part 340: Mono anchorage
341: Fixing port 342: Wax cap
343: Inner connecting tube 344: Closing cap
345: duct 346: connection nut
347: Cap nut 348: Injection tube
350: Tension material 351: Cloth
360: Wedge S: Inner side of the study

Claims (6)

A saddle portion 200 spaced apart from the bottom of the girder 100 in the longitudinal direction and having a tension member guide portion 220 formed to penetrate the tension member and to be guided in the longitudinal direction; And
And a monotender fixing device 300 arranged at the upper ends of both ends of the girder 100 so as to allow both ends of the tension member 350 passing through the tension member guide unit 220 to pass therethrough and to be fixed after being tensed,
Each of the tension members 350 may be fixed to each of the monotense fixing devices 300 by using a mono fixing hole 340 installed in the monotense fixing device 300,
The mono fixing port 340
The tension member 350 is inserted along the tension member guide hole 321 formed in the fixing block portion of the monotender fixing device and is clamped to the fixing port 341 fixed to the tension member guide hole 321 by the wedge 360 And the fixing port 341 is made to be tensed by the tension jack at the inner middle seat S of the monotense fixing device 300,
The saddle portion 200 includes a transverse beam 210 extending as a beam extending laterally on the bottom surface of the girder 100 so as to protrude on both sides of the girder 100; And a tension member guide unit 220. The transverse beam 210 is formed so that a tension member guide unit 220 is passed through the abdomen to guide the tension member 350 and the tension member guide unit 220 A longitudinal tube 222 formed of a circular tube and through which the tension member 350 passes; An end cap 224 fitted to both ends of the longitudinal tube 222 and formed with a through hole 223 through which the tension material passes through the longitudinal tube 222 via the through hole 223; And a filling material 226 filled in the longitudinal tube such that the strand tube 225 is installed so as to connect the tension member through hole 223 of the end cap 224 to each other, And a saddle portion through which the tension member passes through the set strand tube 225. [ delete The method according to claim 1,
The monotender fixing device 300 includes:
A middle body portion 330 having an inner heel S formed between the fixing block portion 310 and the fixing block portion 320 and a mono fixing hole 340 mounted inside the fixing block portion 320 So that the tension member 350 is inserted into the tension member guide hole 321 of the fixing block unit 320 and fixed to the mono fixing hole 340 after the tension by the wedge 360,
The fixing block unit 310 is a block unit that is fixed to the side of the girder 100 through a fastener 312. The fixing block unit 320 includes a tension member 340, The hole 321 extends in the longitudinal direction at a central portion of the fixed body 310. The middle body 330 includes a fixed block portion 310 and a fixing block portion 320 spaced apart from each other to connect the fixing block portion 320 with the tension jack, A mono-tensile fixing device using a saddle portion which is formed in the form of a horizontal plate in which an inner heel S is formed between the fixing block portion 320 and the fixing block portion 320, . The method according to claim 1,
The monotender fixing device 300 includes:
And the other end is fixed to the side of the girder 100 through the fastener 312 so that one tension member is fixed to the outer side of the girder 100. The tension member guide hole 321 is formed at one end of the girder 100, A body 310 which can be fixed after tension;
An inner heavy mass 320 formed to be open to the hollow portion formed in the longitudinal direction of the body portion 310 and having one side communicated with the tensile material guide hole 321; And
And a wedge (340) inserted and fixed in the tension member guide hole (321) to fix the end portion of the tension member in a state of being located in the inner heavy member (320). The method according to claim 1,
The mono fixing port 340
The wedge 360 is inserted into the rear end A of the tension member guide hole 321 so as to be fixed to the inner side of the tension member 350 in the shape of a circular tube. A fixing port 341 provided to allow a frictional force to be secured by forming a thread or the like; A wax cap 342 for closing a nipple groove into which wax is injected as a vertical groove type communicated with a tension member guide hole 321 in the middle of the fixing block portion 320; An inner connection tube 343 which is a hollow tube provided with a rubber ring for preventing the grout from flowing out toward the fixing port 341; The duct 345 is fixed as a cap member inserted into the tension member guide hole 321 at the rear end C of the fixing block on the opposite side of the fixing port 341 and the tension member 350 is inserted into the duct 345 A close cap 344 as a cap member to be penetrated; A tube member installed to be inserted into the tension member guide hole 321 by being guided by the tension member 350 to the fixing block unit 320 so as to be fixed to the close cap 344 and to prevent corrosion and damage of the stress member A duct 345 for receiving the air; And
And an injection tube (348) which is a tube for injecting grout formed above the connection nut (346). (a) a saddle portion 200 spaced in the longitudinal direction on the bottom surface of the girder 100 and having a tension member guide portion 220 formed to penetrate the tension member and guided in the longitudinal direction, A plurality of upper and lower tension members 350 installed in the upper and lower ends of the tension member 350 to pass through both ends of the tension member 350 to be fixed after tension;
a filler 226 is inserted into the tension member guide 220 such that the strand tube 225 is installed so as to connect the stress hole 223 of the end cap 224 constituting the tension member guide unit 220, ;
(c) The tension member 350 is made to pass through the strand tube 225 of the tension member guide unit 220 formed on the saddle portion 200, and both ends of the tension member 350 are extended to the monotender fixing apparatus 300 ;
(c) The ends of the tension member 350 are respectively passed through a duct 345 and a mono fixing hole 340 provided in the prism guide holes 321 of the monotender fixing device 300, To engage the wedge (360) inserted into the wedge (360);
(d) The wedge 360 is fixed to the fixing port 341 of the mono fixing port 340 after the tension member 350 is tensed using the tension jack in the inner middle S of the mono-tension fixing device 300 ; And
(e) injecting the grout through an injection tube (348) formed in the monotender fixing device (300).

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