KR20120116041A

KR20120116041A - Steel wire anchorage for prestredssed girder

Info

Publication number: KR20120116041A
Application number: KR1020110033547A
Authority: KR
Inventors: 이두성
Original assignee: 주식회사 일원테크
Priority date: 2011-04-12
Filing date: 2011-04-12
Publication date: 2012-10-22

Abstract

The present invention increases the reliability of the safety of the structure by recognizing and re-tensioning the tension force drop of the tension member accurately in the main system from time to time through the load cell, and can be re-tensioned at any time when the tension material tension drop, long-term stress change history of the strand The purpose of the present invention is to provide a stranded anchorage fixing device for prestress girder that ensures the safety of users by identifying structural abnormal signs and alarming the abnormal signs.
Prestressing girder anchoring device according to the present invention for achieving the above object is sheath; An acupressure plate having an upper portion of the sheath attached thereto; A retensioning fixture installed on the acupressure plate and having a screw thread formed on an outer circumferential surface thereof; A re-tensioning anchoring nut to which the re-tensioning anchorage is screwed and a thread is formed on an inner circumferential surface thereof; Tensile material is fixed through the pressure plate and the re-tension fixture is fixed in the re-tension fixture; It is characterized by consisting of a wedge inserted between the re-tensioning anchorage and the tension member.

Description

Steel wire anchorage for prestressed girders {steel wire anchorage for prestredssed girder}

The present invention relates to a strand wire anchoring device for prestress girders, in particular, the tension tension of the tension member is accurately recognized and retensioned from the main system from time to time through the load cell to increase the reliability of the structure safety, tension tension re-tension at any time The present invention relates to a stranded anchorage fixing device for prestressed girders that ensures the safety of users by identifying structural abnormalities and alarming when there are abnormalities by managing the history of long-term stress changes.

Generally, as shown in FIG. 1, a plurality of PC beams 1 are continuously installed along a width direction and a length direction of a bridge over an upper end portion of a bridge 2 arranged at a predetermined distance between two shifts. Both ends of each of the PC beams (1) are respectively seated on each of the bridge device (3) provided on the upper surface of the bridge (2), the upper plate (4) is installed on the upper portion of each of the PC beam (1) continuously installed in this way do.

The PC beam 1 is a structure having a predetermined width, thickness, and length. A plurality of sheath pipes 6 having a plurality of PC strands 5 inserted therein have a predetermined shape and distance along a longitudinal direction of the PC beam. And both ends of each of the PC strands 5 are exposed to the expansion concave portion 1b formed at both ends of the PC beam, that is, the concave portion 1b having a width wider than a conventional concave portion. It is supported in a tensioned state by each fixing unit 10 provided at equal intervals on the side wall of the concave inlet 1b, and grease is injected into the sheath pipe 6.

The conventional PC beam fixing apparatus includes a plurality of collets inserted into the head 11 at the rear end of the head 11 of the fixing device 10 for supporting the PC strand 5 which is installed at both ends of the PC beam 1. 12) the tension means 20 for retensioning the plurality of PC strands (5), that is, the PC strands (5) where the stress loss is generated through each of the rear through each other, are installed together, the tension means (20) The inspection means which can visually check and check the fall of the load capacity of the tension means 20 according to the stress loss of the tensioned PC strand 5 by this is comprised.

The fixing unit 10 is a body made of a fallopian tube shape is embedded in the side wall of the PC beam, the front surface of the head 11 is supported in contact with the fixing plate 13 of the fixing unit 10 exposed to the outside of the side wall, the head A plurality of collets 12 for holding one end of each of the PC strands 5 and fixed to the plurality of conical support holes 11a formed at equal intervals in 11 are inserted and fixed.

The collet 12 is assembled so that one end of the outer circumferential surface of the body divided into two or more is bound by a binding ring to form a conical coupling, and the insertion hole of the conical collet 12 coupled as described above is a sawtooth uneven portion (not shown). Is formed, and is configured to firmly hold the PC strand 5 that is inserted into each of the insertion holes.

On the other hand, the tension means 20 is operated by the hydraulic pressure acting on the cylinder body 211, the tension jack 210 for pulling each of the PC strands 5 to the rear, and the front end of the tension jack 210 and Interposed between the rear ends of the head 11 of the fixing unit 10 and separated from the head 11 together with each of the PC strands 5 and the PC strands 5 which are tensioned according to the operation of the tension jack 210. Each of the collet 12 to be moved so as not to move more than a predetermined distance 220, and each PC strand wire that is installed in the rear end of the tension jack 210 is tensioned backward by the tension jack 210 ( It consists of a fixture 230 to hold the end of 5).

The tension jack 210 has a cylinder 211 provided with a hollow port 211C through which a tension side port 211A, a relaxation side port 211B, and a plurality of PC strands 5, through which oil flows in and out, respectively. Cylindrical plunger 212 is installed to move in and out of the hydraulic chamber of the), one surface of the fixture 230 is supported in contact with the end of the plunger 212 exposed to the outside of the cylinder 211, the cylinder The tension side port 211A formed at one side of 211 is provided with a check means for confirming the hydraulic pressure acting in the tension side hydraulic chamber 211D of the cylinder 211.

As the check means, a pressure gauge 213 is used to indicate the internal pressure of the tension-side hydraulic chamber 211D as a scale and a guide, and a check valve 214 is installed outside the pressure gauge 213.

In addition, the outer surface of the cylinder 211 is recorded repeatedly the tension operation status, that is, the pressure value appearing on the pressure gauge 213 after the tension operation every time, and whether or not the pressure in the cylinder hydraulic chamber 211D for subsequent inspection Tension record table 215 for checking the contrast is attached.

The movement limiting hole 220 has a through hole 221 through which the PC strand wire 5 drawn out through each collet 12 is formed at equal intervals, and at the port side end of each through hole 221 at the head A flow hole 222 through which the collet 12 separated from the support hole 11a of the 11 is moved backward is formed, and the movement of the collet 12 is formed inside each of the flow holes 222. A locking step 222a for limiting the distance is formed.

On the other hand, the fastener 230 is a support member 231 with a tapered inner circumferential wall 231A formed inside the cylindrical body in contact with the plunger 212 of the tension jack 210, and the inside of the support member 231 In the split member having a tapered outer circumferential surface 232A inserted into the main wall 231A and having a plurality of supporting holes 232B, and in each of the supporting holes 232B of the fixing member 232. It is composed of a plurality of collet 233 is inserted and supported to hold and secure the end of each of the PC strands (5).

On the other hand, in the conventional PC beam strand wire fixing apparatus, as shown in Figs. 1 and 2, the respective tension means 20 is exposed in the recessed portion (1b) formed at the end of the PC beam (1).

Outside of the tension means 20, as shown in FIG. 4, the head 11 of the fixing unit 10 and the movement limiter 220 of the tension means 20, the tension jack 210 and the fixture 230 ) Is covered with a cylindrical protective cover 30 to protect.

One end of the protective cover 30 is fixed to the fixing plate 13 of the fixing unit 10, and one side of the cylindrical protective cover 30, each port (211A) (211B) and pressure gauge 213 of the hydraulic jack 210 Cutout portion 31 is exposed along the longitudinal direction of the protective cover (30).

At the end of the protective cover 30 is a protective cap 32 to be opened during the tensioning operation of the strand (5) is covered by screwing.

A description will be given of the tension of the PC strand using a conventional PC beam fixing device having the configuration as described above.

Figure 6a shows a state before tensioning the strand by operating the PC beam fixing apparatus of the prior art, the tension of the strand is a PC beam produced in the initial tensioning and tension state performed in the manufacturing stage of the PC beam Each case is performed when re-tensioning the strand in which the tensile loss occurs in the state of construction on the bridge. Here, the example of the re-tension of the strand as the deflection deformation of the constructed PC beam occurs.

In the state before the tension as shown in FIG. 6A, the head 11 contacts the fixing plates 13 of the fixing fixtures 10 fixed to both ends of the PC beam 1, that is, the side wall of the expansion recess 1b. And the PC strand 5 is inserted into each collet 12 inserted into the support hole 11a of the head 11, and a movement limiting tool 220 having a predetermined thickness on the rear surface of the head 11. The front of the is in contact.

The cylinder 211 body of the tension jack 210 is in contact with the rear end of the movement restrictor 220, the support member 231 of the fixture 230 to one end of the plunger 212 inserted into the cylinder 211 ) And a collet 233 in which an end of each of the PC strands 5 is inserted is fixed to the rear side of each supporting hole 232B of the fixing member 232 inserted into the supporting member 231.

In addition, the pressure gauge 213 installed in the tension-side port 211A of the tension jack 210 displays the oil pressure acting on the tension-side hydraulic chamber 211D.

Accordingly, when a tension pump is connected to the tension side port 211A of the tension jack 210 to apply tension to the PC strand 5 in which the stress loss is generated, the hydraulic pressure is applied to the tension side hydraulic chamber 211D. As the plunger 212 of the jack 210 is moved outward, the support member 231 of the fixture 230 in contact with the end of the plunger 212 is gradually moved backward as shown in FIG. 6B.

When the fixture 230 and the support member 231 are moved, by moving the fixing member 232 inserted into the support member 231 and the plurality of collets 233 inserted into the fixing member 232 together, Since the PC strands 5 fixed by the collet 233 are pulled, the PC strands 5 are tensioned at a time, and the PC beams 1 in which the deflection deformation is generated are tensioned to a state before the deflection occurs. Can be restored

On the other hand, the pressure acting in the tension-side hydraulic chamber 211D of the tension jack 210 in the process of the tension of the PC strand 5 in accordance with the operation of the tension jack 210 is applied to the pressure gauge 213 As the pressure is increased, the value of the pressure gauge 213 gradually increases.

Therefore, as shown in FIG. 6C, when the tension of the PC strand 5 is completed, the tension operator writes the working date and the pressure value indicated on the pressure gauge 213 in the tension record table 215.

FIG. 6D illustrates a state in which the plunger 212 of the tension jack 210 according to the related art is drawn out to the maximum, and then the plunger 212 is moved back into the cylinder 211. Open the check valve 214 connected to the tension side port 211A, apply hydraulic pressure to the relaxation side port 211B, and return the extracted plunger 212 to its original position, and then support member 231 of the fixture 230. ) And the collet 233 inserted into the supporting hole 232B of the fixing member 232 and the split type fixing member 232 inserted into the fixing member 232, and these fasteners 230 are also original as shown in FIG. The tension jack 210 can be restarted in the state of returning to the position of.

The fixing device of the conventional prestressed structure as described above is a tension jack (210) for pulling the PC stranded wire (5) extending to the rear of the anchorage (10) actuated by the hydraulic pressure acting on the cylinder body 211 to pull back Interposed between the front end of the tension jack 210 and the rear end of the head 11 of the fixing unit 10, each PC strand (5) and each PC strand (5) that is tensioned in accordance with the operation of the tension jack (210) And a movement limiting hole 220 for supporting each collet 12 separated from the head 11 so as not to move more than a predetermined distance, and installed at the rear end of the tension jack 210 to the tension jack 210. It consists of a fastener 230 for holding and fixing the end of each of the PC strands (5) to be tensioned by the rear, and the fastener 230 is a cylindrical support member 231, a split type fixing member 232, a plurality of collets Since it is a complicated structure consisting of 233, productivity falls and the cost of the fixing apparatus There is a problem that is increasing, the re-tensioning operation is not only a complicated problem, in particular, the movement limiter 220, tension jack 210 and the PC strand (5) protruding long outside the head 11 of the fixing unit 10 and Combining the fixture 230 together, the support member 231, the fixing member 232 and the collet 233 of the fixture 230 must be combined so that the PC strand (5) to extend the long can be retensioned work If the PC strand 5 is short, there is a problem that can not be re-strained.

Therefore, the present invention has been devised to solve the problems described above, by accurately recognizing and re-tensioning the tension force of the tension member in the main system through the load cell from time to time to increase the reliability of the safety of the structure, any time when the tension member tension decreases To provide tension strand fixing device for prestress girder to secure user's safety by identifying structural abnormality and alerting in case of abnormality by managing long-term stress change history of stranded wire. There is this.

Prestressing girder anchoring device according to the present invention for achieving the above object is sheath; An acupressure plate having an upper portion of the sheath attached thereto; A retensioning fixture installed on the acupressure plate and having a screw thread formed on an outer circumferential surface thereof; A re-tensioning anchoring nut to which the re-tensioning anchorage is screwed and a thread is formed on an inner circumferential surface thereof; Tensile material is fixed to a plurality of fixing device through the pressure plate and the re-tensioning anchorage fastening fixture; It is characterized by consisting of a wedge inserted between the re-tensioning anchorage and the tension member.

As described above, the prestressed girder wire fixing device according to the present invention accurately recognizes and retensions the tension drop of the tension member in the main processing system through the load cell to increase the reliability, and at any time when the tension tension decreases, the tension member is re-tensioned. There is a workable effect.

1 is a side view showing a state in which a conventional fixing device is installed on the side of the bridge upper structure,
FIG. 2 is an enlarged detailed view of FIG. 1; FIG.
3 is an exploded perspective view showing a conventional fixing device;
Figure 4 is a perspective view showing a coupling state and a protective cap of a conventional fixing device,
Figure 5 is a longitudinal sectional view showing a conventional fixing device separated;
6a to 6d is an exemplary view showing an operating state of a conventional fixing device,
7 is an exemplary view showing before and after tension in a state in which a strand strand fixing device for prestress girders according to the present invention is installed on a side surface of a bridge upper structure.
8 is an enlarged detailed view of FIG. 7;
9 is an exemplary view showing before and after tension in a state in which a strand strand fixing device for prestress girder according to the present invention is installed on a side surface of a bridge upper structure.
10 is an enlarged detail view of FIG. 9;
11 is an exemplary view showing before and after tension in a state in which a strand strand fixing device for prestress girders according to the present invention is installed on a side surface of a bridge upper structure.
12 is an enlarged detailed view of FIG. 11;
Figure 13 is a block diagram showing a main processing system used in the strand anchoring device for prestress girders according to the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

Figure 7 is an exemplary view showing before and after tension in the prestressed girder wire anchorage fixing device is installed on the side of the bridge superstructure according to the invention, Figure 8 is an enlarged detail of Figure 7, Figure 9 Figure 2 is an exemplary view showing before and after tension in the prestressed girder strand fixing device for the present invention is installed on the side of the bridge upper structure, Figure 10 is an enlarged view of Figure 9, Figure 11 is a view 3 is an exemplary view showing before and after tension in a state in which a strand strand fixing device for a prestress girder according to the present invention is installed on a side surface of a bridge upper structure, FIG. 12 is an enlarged view of FIG. 11, and FIG. It is a block diagram showing the main processing system used for the strand strand fixing apparatus for prestress girders according to this.

As shown in these drawings, the prestressing girder anchoring device (A) according to the present invention is a sheath 10; An acupressure plate 20 having an upper portion of the sheath 10 attached thereto; A tension fixing fixture 30 installed on the acupressure plate 20 and having a male thread 32 formed on an outer circumferential surface thereof; The re-tensioning anchorage 30 is screw-coupled, the re-tensioning anchoring nut 40 is formed with a female thread 42 on the inner peripheral surface; Tensile material 50 is fixed through the pressure plate 20 and the re-tension fixture 30 is fixed in the re-tension fixture 30; It consists of a wedge 60 is inserted between the re-tensioning anchorage 30 and the tension member 50.

That is, the wire strand fixing device (A) for the prestress girder according to the present invention is a sheath 10, a pressure plate 20, a tension fixing fitting 30, a tension fixing nut 40, a tension member 50 and the wedge 60 ) Is an organic device combined.

Here, the sheath 10 is a steel for accommodating the tension member 50.

In addition, the acupressure plate 20 is a steel plate that transmits the external force to the bending resistance of the outer surface at the portion where the external force acts directly on the tension member 50, and is welded to the sheath 10 disposed below.

And the separation prevention protrusion 70 is welded to the outer peripheral surface of the upper surface of the pressure plate 20, to prevent the re-tension fixing nut 40 is separated to the outside.

In addition, the re-tensioning anchorage 30 is made of a circular shape as a whole, and the same height of the fasteners are stacked in a plurality of upper or lower, or composed of a single body, the male thread 32 is formed on the outer peripheral surface, the upper surface of the pressure plate 20 Is installed.

In addition, an internal thread 42 is formed on the inner circumferential surface of the retension fixing nut 40 so as to correspond to the male thread 32 of the retension fixing fitting 30, and is screwed with the retension fixing fitting 30.

In addition, a knob 80 is welded to the outer circumferential surface of the re-tensioning fixing nut 40 to facilitate the rotation of the re-tensioning fixing nut 40 by installing a chain block or a wire on the knob 80.

On the other hand, a load cell 90 is installed between the lower portion of the re-tensioning anchorage 30 and the upper surface of the pressure plate 20, the load cell 90 is connected to the main processing system 110 through a connection line (100).

The load cell 90 reads the tension force of the tension member and transmits the read value to the main processing system 110, that is, the load change and data of the tension member 10 in the load cell 90 are transmitted wirelessly by ZigBee. Alternatively, the wire is transmitted to the main processing system 110 by using a wire, and the main processing system 110 notifies an administrator when an abnormal symptom is alerted.

Here, ZigBee is one of the IEEE 802.15.4 standards supporting near field communication, and is a technology for near field communication and ubiquitous computing in a wireless networking field such as home and office, that is, Zigbee is portable. The concept of telephone or wireless LAN is different from the existing technology, and its small size, low power consumption and low cost are being used as ubiquitous application software such as home network.

On the other hand, the tension member 50 is a state that can be prestressed by one or more bundles of PS steel, the tension member 50 penetrates the pressure plate 20 and the re-tension fixture 30 In the re-tension fixture 30 is installed a plurality of fixed.

In addition, the wedge 60 is a member having a V-shaped cross section so as not to fall off by driving in the gap between the re-tensioning anchorage 30 and the tension member 50.

Hereinafter, the strand strand retension using the strand strand fixing apparatus for prestress girder which concerns on this invention which consists of a structure as mentioned above is demonstrated.

The strand re-tensioning method using the strand anchoring device for prestress girder according to the present invention is a structural problem occurs when the tension force of the tension member 50 in the strand strand anchoring device (A) for prestress girder is lowered. When the general information is notified to the main processing system 110 by the alarm device or the vibration device through the load cell 90, the main processing system 110 checks this, and the tension member 50 in the prestressed girder wire fixing device A is applied. Retension) to maintain tension.

That is, the tensioned height 50 after retensioning the tension member 50 by using the excess steel wire of the tension member 50 protruding to the upper portion of the re-tension anchorage device 30 of the prestressed girder wire fixing device (A) according to the present invention, By fixing the tension fixing nut 40 downward as much as fixing the fixing fixture 30.

Prestressed girder anchoring device (A) according to the present invention made of a configuration and construction as described above accurately recognizes the tension drop of the tension member 50 in the main processing system 110 through the load cell 90, the strand Re-tightening the fixing device (A) to increase the reliability, there is an effect that can be re-tensioning of the tension member 50 at any time when the tension force of the tension member (50).

10: sheath 20: pressure plate
30: Locking stop 32: Male thread
40: tension fixing nut 42: female thread
50: tension member 60: wedge
70: release preventing protrusion 80: knob
90: load cell 100: connection line
110: main processing system
A: Strand fixing device for prestressed girders.

Claims

Sheath 10;
An acupressure plate 20 having an upper portion of the sheath 10 attached thereto;
Re-tensioning anchorage 30 is installed on the pressure plate 20, the male thread is formed on the outer peripheral surface;
The re-tensioning anchorage 30 is screw-coupled, the re-tensioning anchoring nut 40 is formed with a female thread on the inner peripheral surface;
Tensile material 50 is fixed through the pressure plate 20 and the re-tension fixture 30 is fixed in the re-tension fixture 30;
Prestressed girder anchoring device, characterized in that consisting of the wedge 60 is inserted between the re-tensioning anchorage 30 and the tension member (50).

The method of claim 1,
The separation prevention protrusion 70 is welded to the outer circumferential surface of the upper surface of the pressure plate 20, the knob 80 is welded to the outer circumferential surface of the tension fixing nut 40, and the fixing fixture 30 is the same height up and down Stranded wire anchoring device for prestressed girders, characterized in that the stack is formed.

The method of claim 1,
The strand anchor fixing device for prestress girder, characterized in that the knob 80 is welded to the outer circumferential surface of the re-tensioning fixing nut 40.

The method of claim 1,
The re-tensioning anchorage device 30 is a wire strand fixing device for prestress girders, characterized in that the same height of the fasteners are formed stacked up and down.

The method of claim 1,
Prestressed girder wire fixing device characterized in that the load cell 90 is installed between the lower tension fixing fixture 30 and the upper surface of the pressure plate (20).

6. The method of claim 5,
The load cell 90 is connected to the main processing system 110 by wireless or wired through a connection line 100 for the prestress girder, characterized in that the main processing system 110 to notify the administrator by an alarm when abnormal symptoms Strand fixing device.