KR20120041470A

KR20120041470A - Prestressing method of tendon using socket and turnbuckle

Info

Publication number: KR20120041470A
Application number: KR1020100102941A
Authority: KR
Inventors: 이선구
Original assignee: 이선구
Priority date: 2010-10-21
Filing date: 2010-10-21
Publication date: 2012-05-02

Abstract

The present invention relates to a method of prestressing a structure, and in particular, in the external tension method in which the tension member is exposed to the outside of the structure, the tension member is fixed to the end of the structure with anchorages and the sockets are respectively provided on the tension side of the tension member exposed to the outside of the structure. By using the turn buckle installed between the sockets, the tension member is tightened and tensioned to facilitate the tension of the tension member, to measure the tension force, to facilitate the maintenance of the tension member, and the number of tension holes commonly used in external tensioning methods. By reducing the size of the cross section of the structure and reducing the loss of tension due to the slip of the tension material in the anchorage, the construction cost of the structure can be reduced.
Steel wires installed between anchorages installed at both ends of the structure are joined by a connecting tension device installed in the middle of the steel wires, and the steel wires are connected to the ribs of the structure by the anti-bending saddle to protect the steel wires. It is configured to be supported, the connection tension device is composed of a socket and a turnbuckle, the socket is composed of a socket fixing portion for fixing the steel wire and a socket male thread portion coupled with the turnbuckle female screw portion of the turnbuckle, the turnbuckle is a cylindrical structure, turnbuckle inside When the turnbuckle is turned in one direction, the female thread part is formed so that the socket male thread part enters or exits the turnbuckle female thread part to generate or relax tension in the steel wire, and the socket male parts entering from both sides of the turnbuckle are right-handed screws. Turn the turnbuckle to one side with the left side screw on the other side Surface characterized in that the socket male thread portions at the same time be entered into the female screw portion and vice versa by turning the turnbuckle socket male screw portions is arranged to advance to the outside of the turnbuckle female screw portion at the same time.

Description

Prestressing method of tendon using socket and turnbuckle}

The present invention relates to a method of prestressing a structure, in particular, in the external tensioning method in which the tension member is exposed to the outside of the structure, the tension member is fixed to the end of the structure by fixing anchors, and the sockets are installed on the tension side of the tension member, respectively, and a turn provided between the sockets. By tensioning the tension member with a buckle, it facilitates tension, enables measurement of the tension force, facilitates maintenance of the tension member, reduces the number of anchorages commonly used in conventional tension methods, and reduces the size of the cross section. In order to reduce the construction cost of the structure by reducing the loss of tension and the cross section of the solids by increasing the efficiency of the steel wire by reducing the loss of tension due to slip when fixing the tension material in the anchorage.

In general, when attempting to prestress a structure, a fixed anchorage is installed on one side of the structure, and a tension anchorage is installed on the other side, and a continuous tension member is embedded in the structure, and the tension anchor is tensioned in the structure. Prestressing is performed, and in case of tensioning, the anchor head is installed in the tension anchorage, the tensioning equipment is tensioned, and the tension member is tensioned.When the tension is completed, the tension member is fixed to the anchorage by wedges, and the voids between the tension member and the structure are grouted. Fill it.

This tension method uses expensive tension anchors and these tension anchors are usually installed at the end of the structure, so tension loss due to friction and curvature of the duct occurs in the longitudinal direction of the steel wire, so that a large tension force is applied to the tension anchor side. The smallest tension is introduced into the structure on the fixed anchorage side, resulting in an unbalance of prestressing,

In addition, if the beams are installed continuously in the longitudinal direction, secondary tension is difficult after the adjacent beams are installed and the top plate is laid. In the event that the impact occurs, the steel wire should be retensioned to recover the loss of tension, but it was impossible to retension the tension material that is installed inside the structure and grouted with the structure.

As shown in FIG. 3, the present invention includes a fixed anchorage 200, a tensile anchorage 10, and a steel wire 300 installed between the anchorages, embedded in a concrete beam 100, and installed in a tensile anchorage 10. After tensioning the steel wire 300 in the fixed steel wire to the anchorage, and finally the duct wire is installed in the grout through the grout injection port 30 is sealed and the available water of the grout drained to the drain 40 In order to improve the conventional method, as shown in the embodiment shown in Figure 1, the fixed anchorage 200, which is inexpensive and easy to install, is installed at both ends of the structure, and the steel wire installed between these anchorages is exposed to the outside of the structure. By installing a connection tension device 500 consisting of a socket and a turnbuckle in the middle of the steel wire to connect the steel wire 300 and tension, when the wire is tensioned, By reducing the friction of tension, the loss of tension due to friction is reduced and the steel wire is tensioned in the middle part of the structure, so that the same tension force can be introduced into the structure on the left and right of the tensioning device. In this method, the amount of steel wire can be reduced by reducing the loss of tension of the steel wire due to the slipping of the wedge of the tension anchor, and the construction cost can be reduced by reducing the number of expensive tensile anchors.

In particular, by tightening the turnbuckle 700 generates tension in the steel wire to ensure the transmission of tension when tensioning the steel wire, to facilitate the measurement and management of the tension force, easy to use the turnbuckle when the tension of the wire is lost or the wire is relaxed The liner can be retensioned.

The present invention is connected to the tension device 500 is installed between the steel wire 300 is installed between the fixed anchorage 200 installed on both ends of the concrete beam 100, as shown in an embodiment in FIG. Is coupled by, the portion of the steel wire 300 in contact with the ribs 150 of the concrete beam 100 so that the steel wire 300 is supported by the anti-bending saddle 350 to protect the steel wire 300 In the method of tensioning the tension member by using the configured socket and turnbuckle, the tension device 500 is composed of a socket 600 and a turnbuckle 700 as shown in an embodiment in Figure 2 and the socket 600 It consists of a socket fixing part 610 for fixing the steel wire 300 and the socket male screw portion 620 is coupled to the turnbuckle female screw portion 750 of the turnbuckle 700 and the turnbuckle 700 is a cylindrical structure turnbuckle inside Female threaded portion 750 is formed to turn the turnbuckle 700 in one direction When the socket male thread portion 610 enters or exits the turnbuckle female thread portion 750, tension or force is generated in the steel wire 300, and the socket male thread portions 620 entering from both sides of the turnbuckle 700 are one side. If this is a right screw, the other side is left-handed and the turnbuckle 700 is turned to one side, so that the socket male parts 620 installed on both sides of the turnbuckle 700 enter the inside of the turnbuckle female thread part 750 at the same time, and when turned to the opposite, the socket male thread part Characterized in that the 620 is configured to advance to the outside of the turnbuckle female screw portion 750 at the same time.

The present invention is to install a simple anchorage on both ends of the structure to be prestressed is inexpensive, easy to install, and is not subject to the geometrical constraints due to the anchorage in the manufacture of the structure, the steel wire between the anchorage is installed outside the structure By connecting to the tensioner consisting of socket and turnbuckle in the middle of the steel wire, and connecting the steel wire to both sides of the steel wire, the steel wire is caused by friction of the duct and slip of the wedge in the tension anchor when installing the steel wire in the conventional method. Reduces the loss of tension and improves structural efficiency due to tension of steel wires, thereby reducing the amount of steel wires to increase economic efficiency, reducing the number of tensile anchorages and reducing the cross-sectional area of the structure in which the anchorages are installed, as well as reducing the construction cost, and turnbuckles When tensioning the steel wire by tightening It ensures the transmission of tension and makes tension in the center of the structure, so that the same tension force can be introduced to both structures of the tension device, and it is easy to measure and manage the tension force through the tensioning device. When relaxed, the turnbuckles can be used to easily retension the wire.

Figure 1 is a longitudinal cross-sectional view showing the tension of the steel wire by applying a connection device consisting of a socket and a turnbuckle to the concrete beam as an embodiment according to the present invention.
Figure 2 is a detailed view of the tensioning device showing the tension of the wire by applying a tensioning device consisting of a socket and a turnbuckle according to an embodiment of the present invention.
Figure 3 is a longitudinal sectional view showing the tension method of the concrete beam by the conventional method.
<Brief description of symbols for the main parts of the drawings>
10: tension stop 200: fixed stop
30: grout inlet 100: concrete beam
300: steel wire 150: rib
350: saddle prevention saddle 600: socket
610: socket fixing part 620: socket male
700: turnbuckle 750: turnbuckle female thread

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

Figure 1 is a longitudinal cross-sectional view showing the tension of the steel wire by applying a connecting device consisting of a socket and a turnbuckle to the concrete beam according to the present invention, Figure 2 is a steel wire by applying a connection tension device consisting of a socket and a turnbuckle according to the present invention Fig. 3 is a longitudinal sectional view showing the tensioning method of the concrete beam by the conventional method.

Connection long device consisting of a socket and a turnbuckle according to the present invention is installed when the steel wire is tensioned to generate a prestress to the structure as shown in Figure 1 fixed to the left and right sides of the beam to generate prestress in the concrete beam 100 Install the anchorage 200 and the steel wire 300 fixed to the anchorage between the anchorage, cut the middle portion of the steel wire to mount the connection tension device 500 there, the ends of the steel wire 300 on both ends of the connection tension device Combining and using the connection tension device 500 is composed of generating a prestress to the structure by introducing a tension force to the steel wire.

Steel wire 300 exposed to the outside of the concrete beam 100 in contact with the ribs 150 of the concrete beam 100 by the bend prevention saddle 350 to protect the steel wire 300 steel wire 300 ) Is configured to be supported.

Here, the connection tension device 500 is composed of a socket 600 and the turnbuckle 700 and the socket 600 is a socket buckle screw portion of the socket fixing part 610 and the turnbuckle 700 for fixing the steel wire 300 Consists of the socket male screw portion 620 is coupled to the 750 and the turnbuckle 700 is a cylindrical structure is formed with a turnbuckle female screw portion 750 therein, turning the turnbuckle 700 in one direction, the socket male screw portion ( 610 is to enter or exit the turnbuckle female screw portion 750 to generate or relax tension in the steel wire 300, the socket male thread portion 620 entering from both sides of the turnbuckle 700, the other side if the right hand screw If one side turn the turnbuckle 700 to one side, the socket male part 620 coupled to both sides of the turnbuckle 700 enters the inside of the turnbuckle female thread part 750 at the same time. Others of turnbuckle female thread part 750 It is configured to advance to.

Claims

In the method of installing prestress in the structure by installing the anchorage in the structure and exposing the steel wire to the outside of the structure to tension the steel wire 300 between the anchorage,
The steel wire 300 installed between the anchorages installed in the structure is coupled by the connection tension device 500 is installed in the middle of the steel wire, the connection tension device 500 is composed of a socket 600 and a turnbuckle 700. The socket 600 includes a socket fixing part 610 for fixing the steel wire 300 and a socket male thread part 620 coupled with the turnbuckle female screw part 750 of the turnbuckle 700, and the turnbuckle 700. Is a cylindrical structure has a turnbuckle female screw portion 750 formed therein, when turning the turnbuckle 700 in one direction, the socket male screw portion 610 enters or exits the turnbuckle female screw portion 750 to attract the steel wire 300. Or to push or push the turnbuckle 700 to generate tension or to relax the wire, and the socket male threads 620 entering from both sides of the turnbuckle 700 are turned to one side and the other to the left side. Socket male parts 620 are simultaneously turned It enters the inside of the female threaded portion 750 and vice versa by turning the male screw socket unit how to 620 are using a socket and a turnbuckle, characterized in that is configured to advance out of the turnbuckle female screw portion 750 at the same time relax the tendons.