KR20150111714A - Continuous bridge for re-tensioning external tendon by detecting prestress force loss, and construction method for the same - Google Patents

Abstract

Provided are a continuous bridge capable of re-tensioning an external steel wire by measuring the loss of tensible force and a construction method thereof capable of offsetting a generated moment and securing damaged load carrying capacity by reinforcing positive and negative moment portions at the same time with an external steel wire reinforcement method if scarce load carrying capacity of a continuous bridge formed by continuously constructing a concrete girder is secured, easily re-tensioning the external steel wire as the loss of the tensible force by measuring the positive and negative moment portions at the same time with a wire or without the wire if the loss of the tensible force of the external steel force is generated by temperature and environmental external factors as time goes by, easily restoring the deflection of the concrete structure of a continuous bridge, effectively preventing a crack in the center unit, safely reinforcing the concrete structure by an offsetting force at the negative moment portion as deflection reinforcement amounts of the center unit, executing the re-tensioning always, and securing safety.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous bridge capable of tensioning an outer steel wire by measuring a tensile force loss,

The present invention relates to a continuous bridge capable of re-tensioning an outer steel wire, and more particularly, to a steel wire having an outer wire connected to a concrete structure, The present invention relates to a continuous bridge capable of tensioning an outer steel wire by measuring the amount of tension loss when a tensile force loss occurs due to the steel wire, and a construction method thereof.

Generally, since the load-bearing capacity of a concrete structure of a bridge is determined by how much resistance to live load or dead load, it can be said that a concrete structure that can act a lot of live load or dead load has a great load-bearing capacity. For example, a concrete structure such as a girder or a slab, which is made of reinforced concrete, has a very large dead load. Therefore, the sectional size of the concrete structure should be determined so as to have a load bearing capacity to effectively resist live loads as well as dead loads.

However, since the deterioration of the concrete structure over time is inevitable after the actual bridge is constructed, many methods for reinforcing the concrete structure have been introduced. For example, steel reinforcement methods for improving the load-bearing capacity of bridges that have been used up to now include steel plate bonding method, epoxy panel bonding method, cross section increasing method, member extension method, and external steel wire reinforcement method.

Specifically, in the steel plate bonding method, steel reinforcing bars and reinforcing plates used in conventional bridges and the like have similar material properties in terms of elastic modulus and the like, so that the steel reinforcing effect is excellent, but corrosion maintenance is very difficult. In addition, There is a problem that the concrete structure and the attached surface are likely to be relaxed. In addition, the steel plate adhesive injection method has a problem in that when the concrete structure of a conventional bridge has many cracks and defects, the reinforcement effect is insufficient.

The epoxy panel bonding method is a method similar to the method of adhering a steel plate. The epoxy panel is placed on the surface of a concrete structure and then attached to the surface of the concrete structure with an epoxy resin. At this time, Strength is determined. Therefore, when the concrete surface of the concrete structure is corroded due to weathering or the like, the adhesion strength becomes insufficient. In addition, when an ultimate load acts, peeling may occur on the surface of the concrete, which may cause destruction of the bond. This is very dangerous because it is a result opposite to the purpose of inducing ductile failure and minimizing life and economic damage.

In addition, since the cross-sectional increase method and the member addition method increase the dead load more than the concrete structure, when the increased load is large, the lower structures such as the column or the bridge are increased by the load increase amount. do.

Most of the concrete structure reinforcing methods according to the prior art do not largely deviate from the level of reinforcing the concrete structure by the provisional method and do not sufficiently satisfy various field conditions so that it is difficult for the skilled person to construct the concrete structure perfectly . In addition, it is known that the repair and reinforcement effects of concrete concrete structures are insufficient when safety inspection and precision diagnosis results of concrete structures that have been repaired and reinforced according to the prior art are confirmed.

On the other hand, external reinforcing steel reinforcement is the most popular method for reinforcement of concrete structures. However, in the case of the conventional external steel reinforcement method, it is difficult to dispose the steel wire, install the center saddle, It is difficult to re-tension the outer steel wire due to the use of the wedge-type method which is liable to cause damage to the structure, insufficient safety during use, and difficult to re-tension and maintenance in the future. Especially, There is a problem in that it is not possible to easily measure the amount of tensile force loss. In particular, there has been no disclosure of a method for reinforcing external steel reinforcements simultaneously reinforcing the moment moments of a concrete structure having the same structure such as a continuous bridge.

Specifically, a concrete structure such as a continuous bridge concrete girder or a concrete beam is reinforced by introducing post tension. As a method of introducing the post tension to such a concrete structure, a tension material is placed on the outside of the concrete structure, and then the tension is applied to the concrete structure by the tension of the tension material by fixing the tension material by d External post tension method is widely used.

In this case, a separate bracket is provided on the outer side of the concrete structure for external post tension, a tension is applied to an end of the tension member after the tension member is disposed, and a tension member is fixed to the bracket. For example, as shown in Fig. 1, tensile force is simultaneously introduced at both ends and a middle portion of a concrete girder of a bridge to eliminate concentration of local stress generated in the concrete girder fixing portion, effectively preventing sagging and cracking at the center portion And a method of reinforcing an external tensile material of a bridge beam using the multistage fixing device.

1 is a view showing a girder for a bridge for introducing a prestress using an external tensile material according to a conventional technique.

1, a bridge girder for introducing a prestress using an external tensile material according to the related art is formed by bending both ends of an upper portion of a concrete girder 12 so as to surround the lower portion of the concrete girder 12, An end fusing plate 21a fixed to the lower end portions of both ends and both side surfaces by anchor bolts, and a pair of end fusing devices 21a and 22b provided on the lower and both side surfaces of the end fusing plate 21a 21); Both ends of the concrete girder 12 are folded upward so as to surround the lower portion of the concrete girder 12 and anchor bolts A pair of intermediate fixing devices (22) provided with automatic fixing ports respectively formed on the lower side and both side surfaces of the intermediate fixing plate; And a tensile member which is disposed below the concrete girder 12 of the bridge 11 and is fixed to the end fixing apparatus 21 at both ends in a tensile state, A tensile material that is fixed to the end fixing device 21 at both ends thereof and a tensile material that is disposed under the concrete girder 12 of the bridge 11 and is tension-fixed to the intermediate fixing device 22 in a tensioned state, And a plurality of external tensile members 30, each of which is composed of a tensile material disposed on both lower sides of the intermediate fixing unit 22 and tensile fixed to the intermediate fixing unit 22 in a tensile state.

In the case of a girder for introducing a prestress using an external tensile material according to the prior art, the reinforcing effect at the center point portion is very excellent by introducing the compressive force and the bending moment due to the tension of the external tensile material 23 in multiple stages, It is possible to effectively prevent a local stress concentration phenomenon that occurs at both ends of the substrate.

However, in order to install such an external tensile material 23, the end fixing device 21 and the intermediate fixing device 22 must be installed in the middle between both ends of the girder and both ends, Particularly in the case of a girder for long span where the extension length of the concrete girder 12 is long, the end fixing device 21 and the intermediate fixing device 22 ) Is repeated, the workability is very low and there is a problem that the economical efficiency is inevitably lowered.

In addition, since the external tensile material 23 uses a tensile material such as unbonded stranded wire, the deterioration of the workability is very large since it must be fixed after it is strained on the fixing member, and the fastening port of the tensioned external tensile material 23 is used as the external tensile material 23 The worker must be installed at the bottom of the concrete girder 12, so that the problem of workability deterioration has always been raised.

A structural reinforcement method using a stress-distribution fixing fixture and an outer steel wire to solve a problem of a bridge girder in which a prestress is introduced by using the above-mentioned external tensile material has been disclosed, which will be described with reference to FIG.

FIG. 2 is a view for explaining a structure reinforcement method using a stress distribution fixing port and an outer steel wire according to a conventional technique.

Referring to FIG. 2, in the structure reinforcing method using the stress dispersion fixing port and outer steel wire according to the related art, the outer steel wire 40 is positioned between the fixing plates so as to pass through the fixing holes of the fixing plate. Since the side plates are installed on the sides of the concrete girder 30 between the bottom fixing plates, the outer girders 40 may be installed between the bottom fixing plates and between the side fixing plates, It is possible to prevent excessive stress concentration on the concrete girder 30 because the fixing part is dispersed.

Since the outer steel wire 40 is provided with the cap type fixing member in advance, it can be easily installed on the fixing plates, and after tightening the outer steel wire 40 using a jack device such as an unillustrated hydraulic jack or the like, .

It is possible to reinforce the girder quickly because it can be completed simply by completing the structure reinforcing method using the stress dispersion fixing port and the outer steel wire according to the related art and if the re-tension is needed later, the reinforcement using the jack device or the like, It is very advantageous for maintenance.

In the case of the external steel wire reinforcement method according to the related art, there is a risk that the installed fixture is not rigid and the fixing structure may be detached from the concrete structure, for example, a concrete girder or a concrete beam to collapse the concrete structure, The reinforcement effect is insufficient due to the ineffective placement of the external steel wire, and in particular, the external wire reinforcement method is not applied in the case of continuous connection.

Further, in the case of the outer steel reinforcement method according to the related art, cracking and sagging due to aging of the concrete structure or relaxation of the outer steel wire occurs over time, and therefore, reinforcement of the concrete structure due to lack of load- . At this time, after the hydraulic jack is mounted and the hydraulic jack gauge is checked, it is required to re-tense as much as the amount of the tension loss, so that maintenance and reinforcement are inconvenient and economic loss may occur.

Korean Published Patent No. 2013-121343 (Published on November 6, 2013), entitled "Prestressed Concrete Structure Containing Exposed Tension Material and Method of Measuring Tension Using the Same" Korean Patent No. 10-823640 filed on October 28, 2005, entitled "Method of manufacturing a tensile force measurable tension force" Korean Unexamined Patent Publication No. 2005-40888 (published on May 3, 2005), entitled " Tensile Strength Measurement Method and Tension Material Preparation Method for Structures " Korean Patent No. 10-1049720 filed on Sep. 29, 2010, entitled "Stress change management system of a bridge with FBG optical fiber stress measurement sensor" Korean Registered Patent No. 10-989947 filed on February 11, 2010, entitled "Permanent Re-tensionable Structural Reinforcement Device" Korean Unexamined Patent Publication No. 2003-29252 (Publication Date: April 14, 2003), entitled "METHOD AND APPARATUS FOR MEASURING BRIDGE BEHAVIOR IN APPLICATION OF EXTERNAL TENSION MATERIALS FOR BRIDGE BEAMS" Korean Unexamined Patent Publication No. 2002-39640 (published May 27, 2002), entitled "Screwed tensioner device for external post tensioning of a prestressed concrete structural member" Korean Unexamined Patent Publication No. 2002-33146 (Publication Date: May 4, 2002), entitled "Method and Method for Reinforcing External Tension Material of Reinforced Concrete Structure"

In order to solve the above problems, it is an object of the present invention to provide a method of reinforcing a momentum portion and a moment portion in a straight line by an external steel wire reinforcing method, when insufficient load bearing capacity is secured in a continuous bridge formed by continuous construction of a concrete girder And to provide a continuous bridge capable of tensioning the outer steel wire by measuring the amount of tensional force loss, which can compensate the generated moment and secure a lost load-bearing capacity, and a method of construction thereof.

It is another object of the present invention to provide a method and apparatus for measuring the tension and moment of an outer steel wire by measuring the tension and moment portions at the same time by wire or wireless, The present invention is to provide a continuous bridge capable of easily restraining an external steel wire and measuring the amount of a tensile force loss so that the external steel wire can be tense.

It is another object of the present invention to provide a concrete structure structure capable of easily restoring the deflection of a continuous concrete structure and effectively preventing cracks in the center portion and canceling the force in the portion of the momentum by the amount of deflection at the center portion, The present invention is to provide a continuous bridge capable of stably reinforcing and restraining external ties by measuring the amount of tensional force loss which can always be restrained and securing safety.

As a means for achieving the above-mentioned technical object, the continuous bridge capable of measuring the amount of tensile force loss according to the present invention to tension the outer steel wire is a concrete structure for continuous bridge construction, which is arranged at a predetermined interval on a pier, The first and second concrete girders being formed such that the lifting holes face each other; A first fusing member installed on a lower side or a side surface of the lower end of the lifting hole for reinforcing the upper ends of the first and second concrete girders; A second fusing member installed at an upper end of the lifting hole to reinforce the momentum of the first and second concrete girders; 1. A threaded strand fixed by a first fixing nut, comprising: a first outer strand fixed to the first fixing member to introduce a tensile force for reinforcing a momentum; A second outer strand fixed to the second fixing member to introduce a tensile force for strengthening the momentum, the screw strand being fixed by a second fixing nut; And first and second tensional force loss detecting sensors installed at one side of the first and second outer tires for detecting a torsional loss amount of the first and second outer torsion beams, wherein the first and second torsional loss amounts And when the detection sensor detects a tension force loss amount equal to or greater than a set value, the first and second outer steel wires are re-tensioned.

Here, the first and second fixing members are made of a hot-dip galvanized material for preventing corrosion, and the first and second hot-dip galvanized fixing members are provided with steel rods in the lifting holes of the first and second concrete girders Can be installed.

Here, the first and second outer steel wires may be linearly arranged with threaded strands integrated by cold extrusion.

Here, the ends of the threaded strands are threaded so that the first and second fixing nuts fixing the first and second outer strands can be fastened.

Here, the first and second tensional force loss detection sensors may be any one selected from a load cell, a hot spring in the form of a plate or a coil, or a strain gauge.

Here, the load cell and the plate or coil-shaped hot springs may be installed between the first and second fixing nuts for fixing the first and second outer steel wires and the first and second fixing members, respectively.

Here, the strain gauge may be installed on one side of the first and second outer steel wires.

Here, the amount of the tensional force loss detected through the first and second tractive force loss detecting sensors may be transmitted to the outside so that the lead wire can be extracted to the outside or can be confirmed by the remote measuring center so that it can be confirmed through the field terminal having the indicator .

Here, the field terminal may use a power source or battery power charged through the solar cell module.

In another aspect of the present invention, there is provided a continuous bridge construction method for measuring a tension loss amount according to the present invention to tension an outer steel wire, the method comprising: measuring a tension loss of the concrete girder, A method for continuous bridge construction comprising the steps of: a) installing first and second concrete girders, each having a first fixing member for reinforcing upper ends, on a pier; b) installing a second fixing member for reinforcing the momentum on top of the lifting holes of the first and second concrete girders; c) mounting first and second outer steel wires formed of a threaded strand to the first and second fixing members, respectively; d) installing first and second tensional force loss detection sensors on one side of the first and second outer steel wires; e) introducing a tensioning force on the first and second outer strands and performing subsequent work to complete the continuous strand; f) measuring the torsional loss amounts of the first and second outer steel wires corresponding to the reduction of the moment and moment of the first and second concrete girders at the same time by the first and second torsional loss loss detection sensors; g) comparing the measured amount of tensional force loss with a set value to determine whether a tensional loss amount has occurred; And h) reinforcement of the moment and moment of the first and second concrete girders by re-tensioning the first and second outer steel wires, respectively, when the amount of the tensional force loss occurs.

According to the present invention, when insufficient load bearing capacity is secured in a continuous bridge formed by continuous construction of a concrete girder, the external moment reinforcing method simultaneously reinforces the moment portion and the moment portion to linearly compensate the generated moment and secure the lost load can do.

According to the present invention, when a loss of tension of an outer steel wire occurs due to external factors such as temperature and environmental conditions over time, the outer steel wire can be easily measured You can relax again.

According to the present invention, in consideration of the safety of the concrete structure, it is possible to prevent the concrete structure from being damaged by integrating the fixing member with a steel bar rather than an anchor bolt using the lifting hole of the concrete structure.

According to the present invention, the amount of tensional force loss of the outer steel wire can be measured either on the wire or wirelessly through the tensional force loss detecting sensor, so that it can be always confirmed on the field or at a remote place.

According to the present invention, it is possible to work only at alternate portions and pier portions without saddle at the central portion of the concrete structure.

1 is a view showing a girder for a bridge for introducing a prestress using an external tensile material according to a conventional technique.
FIG. 2 is a view for explaining a structure reinforcement method using a stress distribution fixing port and an outer steel wire according to a conventional technique.
3 is a cross-sectional view illustrating a continuous bridge capable of re-tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention.
4 is a view for explaining the measurement of the amount of tensile force loss for re-tightening the outer steel wire according to the embodiment of the present invention.
FIG. 5 is a diagram showing that various types of tensional force loss detecting sensors shown in FIG. 4 can be implemented.
FIG. 6 is a configuration diagram of a field terminal and a remote measurement center for measuring a tension loss amount in a continuous bridge capable of re-tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention.
7 is a flowchart illustrating an operation of a continuous bridge construction method capable of re-tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the term "part" or the like, as described in the specification, means a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

[Continuous bridges (100) in which tension of external tensions can be measured by measuring tension loss amount]

FIG. 3 is a cross-sectional view illustrating a continuous bridge capable of tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention. FIG. 4 is a cross- Fig. 5 is a diagram showing that various types of tensional force loss detecting sensors shown in Fig. 4 can be implemented. Fig.

Referring to FIG. 3, the continuous bridge 100 capable of measuring the amount of tensional force loss according to an embodiment of the present invention to tense the outer bridge includes a pier 110, a coaxial base 120, first and second concrete girders 130a The first fixing member 170 and the second fixing member 180. The first fixing member 150 and the first fixing member 170 are fixed to the first fixing member 150, A first torsional fatigue loss detection sensor 220 and a second torsional fatigue loss detection sensor 230.

The first and second concrete girders 130a and 130b are concrete structures for continuous bridge 100 construction and are formed on piers 110 at substantially a predetermined interval And the lifting holes 140 are formed at the one end portions so as to face each other. The lifting holes 140 are formed on the side surfaces and the bottom surfaces of the first and second concrete girders 130a and 130b in order to lift the first and second concrete girders 130a and 130b on the piers 110, Respectively.

The first fixing member 150 is installed on the lower side or the side surface of the lower end of the lifting hole 140 for reinforcing the upper ends of the first and second concrete girders 130a and 130b and the second fixing member 180 And are installed at the upper ends of the lifting holes 140 for reinforcing the momentum of the first and second concrete girders 130a and 130b. For example, the first and second fixing members 150 and 180 are made of a hot-dip galvanized material for preventing corrosion, and the first and second hot-dip galvanized fixing members 150 and 180 are made of the 1 and the lifting holes 140 of the second concrete girders 130a and 130b using steel bars.

Specifically, first and second fixing members 150 and 180 are installed in the lifting holes 140 of the concrete structure to prevent damage to the concrete structures 130a and 130b and secondary cracks, respectively. At this time, (Not shown) at the time of installing the first and second fixing members 150 and 180 in the lifting holes 140 of the concrete structures 130a and 130b to reduce the damage of the concrete structures 130a and 130b, Can be prevented.

In other words, the epoxy coating, which is used most at the time of the current construction, starts to generate corrosion after 2 to 3 years, and therefore there is a problem in that it is necessary to repaint and thus economic loss may occur. However, the lifetime of the hot- It is preferable to manufacture the first and second fixing members 150 and 180 according to the embodiment of the present invention by hot-dip galvanizing. Conventionally, since the anchor bolts are mainly used at the time of installing the first and second fixing members 150 and 180, there is a risk of damage and disconnection of the concrete structures 130a and 130b. However, in the first and second fixing members 150 and 180 according to the embodiment of the present invention, The first and second fixing members 150 and 180 are installed in the lifting holes 140 of the concrete structures 130a and 130b using steel bars when the first and second fixing members are installed, It can reduce the damage and prevent the risk of dropout.

The first outer steel wire 160 is a threaded strand fixed by the first fixing nut 170. The first outer steel wire 160 is fixed to the first fixing member 150 to introduce a tension force for reinforcing the momentum and the second outer steel wire 190 Is a threaded strand fixed by the second fixing nut 210, and is mounted on the second fixing member 180 to introduce a tensile force for strengthening the momentum. For example, the first and second outer steel wires 160 and 190 are arranged in a straight line with a threaded strand integrated in the cold extrusion process, in which the mandrel 161 at the end of the threaded strand is threaded The first and second fixing nuts 170 and 210 for fixing the first and second outer steel wires 160 and 190 may be fastened. Here, the first and second outer steel wires 160 and 190 may be a steel wire, a strand wire, or a tie cable.

The first and second tensional force loss detection sensors 220 and 230 are installed on one side of the first and second outer steel wires 160 and 190 to detect a tension force of the first and second outer steel wires 160 and 190 The loss amount is detected. For example, the first and second tensional force loss sensors 220 and 230 may be selected from a load cell 220a, a hot spring 220b in the form of a plate or a coil, or a strain gauge 220c Lt; / RTI > 5A and 5B, the load cell 220a and the plate or coil-shaped hot springs 220b are connected to the first and second outer steel wires 160 and 190, respectively, And may be installed between the first and second fixing nuts 170 and 210 and the first and second fixing members 150 and 180, respectively. Alternatively, as shown in FIG. 5C, the strain gage 220c may be installed at one side of the first and second outer steel wires 160 and 190.

Subsequently, when the first and second torsional loss detection sensors 220 and 230 detect the amount of the torsional force loss equal to or greater than the set value, the first and second outer torsion beams 160 and 190 are re-tensioned. 4, the amount of the tensional force loss detected through the first and second tensional force loss detecting sensors 220 and 230 may be checked through the field terminal 310 having the indicator 315 The lead wire is drawn out to the outside or transmitted wirelessly so that the remote measurement center 320 can confirm it. In addition, the field terminal 310 may use a power source or battery power charged through the solar cell module 316. [

In a continuous bridge capable of measuring the amount of tensional force loss according to an embodiment of the present invention and re-tensing the outer steel wire, the support of the first and second fixing members (150, 180) and the first and second tractive force loss detection sensors 220 and 230 are integrated with the first and second fixing nuts 170 and 210, and at the same time, a restored load bearing force is generated.

When introducing the tensile force of the first and second outer steel wires 160 and 190, the tensile tonnage of the upper and lower tensile portions of the concrete structures 130a and 130b is greater than the tensile tonnage of the concrete structures 130a and 130b. 130b, and has the effect of reinforcing the concrete structures 130a, 130b at the same time.

6 is a configuration diagram of a field terminal and a remote measurement center for measuring a tension loss amount in a continuous bridge capable of re-tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention.

As shown in FIG. 6, the field terminal 310 for measuring the amount of tensile force loss in the continuous bridge capable of re-tensioning the outer steel wire by measuring the amount of tensile force loss according to the embodiment of the present invention includes a receiving portion 311, The field terminal 310 may further include an indicator 315 and a solar cell module 316. The field terminal 310 may include a data logger (Data Logger).

The receiving section 311 receives the tensional force loss amount detection signal from the first and second tensional loss loss amount detection sensors 220 and 230 at the same time.

The tensional force loss calculating unit 312 may calculate the tractive force loss detecting signal received by the receiving unit 311 and compare the detected tractive force loss detecting signal with a preset value to determine whether a tensional force loss greater than a preset value has occurred. At this time, the calculated amount of the tensional force loss can be stored in the database 313. In this case, the amount of the tensional force loss can be calculated, for example, by a displacement measurement method. The amount of tensional force loss P can be calculated as shown in the following equation (1), but is not limited thereto.

Where P represents the amount of tension loss, ∇ represents the amount of displacement, E is the modulus of elasticity, A is the cross-sectional area, and L is the length.

The transmission unit 314 transmits the calculated amount of the tensional force loss to the remote measurement center 320.

The indicator 315 is connected to the lead wires of the first and second tensional force loss detecting sensors 220 and 230 so that the tester can visually confirm the amount of tensional force loss.

The solar cell module 316 supplies power to the field terminal 310. At this time, battery power may be used instead of the solar cell module 316. [ That is, the battery power source used in the field terminal 310 installed in the concrete structure can be used as the required power source, but the solar cell module 316 can be operated to continuously operate the field terminal 310 even in an emergency such as a short circuit. Can be used.

6, the remote measurement center 320 for measuring the amount of torsional fatigue in the continuous bridge capable of measuring the amount of torsional force loss according to the embodiment of the present invention and re-tensioning the outer torsion bar may include a receiving unit 321, But is not limited to, a controller 322, a database 323, and a display 324.

For example, the telemetry center 320 can remotely check the amount of tensional force loss wirelessly transmitted from the field terminal 310, and if it is determined that a loss of tensions occurs, the concrete structures 130a, Thereby allowing the first and second outer steel wires 160 and 190 to re-tension.

[Construction method of continuous bridges that can measure the amount of tension loss and tie the outer steel wire]

FIG. 7 is a flowchart illustrating a method of constructing a continuous bridge capable of tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention.

Referring to FIG. 7, a continuous bridge construction method capable of re-tensioning an outer steel wire by measuring a tension loss amount according to an embodiment of the present invention includes a continuous bridge construction method capable of re-tensioning an outer steel wire by measuring a tension loss amount of a concrete girder The first and second concrete girders 130a and 130b having the first fixing members 150 for reinforcing the top ends are installed on the piers 110 at step S110.

Next, the second fixing member 180 for reinforcing the momentum is installed at the upper end of the lifting hole 140 of the first and second concrete girders 130a and 130b (S120).

Next, the first and second outer steel wires 160 and 190 formed of a threaded strand are respectively mounted on the first and second fixing members 150 and 180 (S130).

Next, first and second tensional force loss detecting sensors 220 and 230 are installed on one side of the first and second outer steel wires 160 and 190 (S140). Specifically, the first and second tensional force loss sensors 220 and 230 may be a load cell 220a, a hot spring 220b in the form of a plate or a coil, or a strain gauge 220c . For example, the load cell 220a and the plate or coil-shaped hot spring 220b may include first and second fixing nuts 170 and 210 for fixing the first and second outer steel wires 160 and 190, Or between the first and second fixing members 150 and 180 or the strain gauge 220c may be installed at one side of the first and second outer steel wires 160 and 190. [

Next, a tensional force is applied to the first and second outer steel wires 160 and 190, and a subsequent work is performed to complete a continuous bridge (S150). Specifically, when the first and second concrete girders 130a and 130b are installed, a slab is formed on the first and second concrete girders 130a and 130b to complete the continuous bridge. The concrete structures 130a and 130b and the first and second fixing members 150 and 150 may be integrally formed to integrate the first and second fixing members and the concrete structures 130a and 130b after completing the above- 180, the epoxy concrete can be integrated with the concrete structures 130a, 130b by injecting epoxy again after pouring and curing the epoxy concrete.

Next, the amount of torsional loss of the first and second outer steel wires 160 and 190 corresponding to the reduction of the moment and moment of the first and second concrete girders 130a and 130b is calculated as the first and second tensile forces The loss detection sensors 220 and 230 simultaneously measure (S160).

Next, the measured tension loss amount is compared with a set value to determine whether a tension loss amount has occurred (S170). For example, the amount of torsional force loss detected through the first and second torsional loss detection sensors 220 and 230 may be detected by the field terminal 310 having the indicator 315, And can be wirelessly transmitted to the remote measurement center 320 for confirmation.

Next, when the tensional force loss occurs, the first and second outer steel wires 160 and 190 are re-tensioned to reinforce the primary and secondary moments of the first and second concrete girders 130a and 130b (S180).

In order to arrange the first and second tractive force loss detecting sensors 220 and 230 in the continuous bridge construction method in which the outer torsion line can be re-tensioned by measuring the amount of torsional force loss according to the embodiment of the present invention, And the first and second outer steel wires 160 and 190 are fixed to the fixed ends of the first and second fixing members 150 and 180, After the first and second tensional force loss detection sensors 220 and 230 are installed on the supports of the first and second fixing members 150 and 180 before the tensioning of the second fixing members 150 and 180 And the first and second outer steel wires 160 and 190 are mounted. At this time, the strand used as the first and second outer strands 160 and 190 is a strand unified by cold extrusion without corroding, and is screwed into the strand 161 at the end of the strand It is processed and used.

As a result, according to the embodiment of the present invention, when insufficient load bearing capacity is secured in a continuous bridge formed by continuously constructing a concrete girder, the external moment reinforcing method is used to simultaneously reinforce the moment portion and the moment portion, It is possible to secure the lost load-bearing capacity.

According to an embodiment of the present invention, when a loss of tension of an outer steel wire due to external factors such as temperature and environmental conditions occurs over time, the tension moment portion and the moment portion are simultaneously measured by wire or wireless, The outer steel wire can be easily re-tensioned.

Also, according to the embodiment of the present invention, in consideration of the safety of the concrete structure, by using the lifting hole of the concrete structure, the fixing member is integrated with the steel rod instead of the anchor bolt, thereby preventing the concrete structure from being damaged.

In addition, according to the embodiment of the present invention, it is possible to always check the tension loss amount of the outer steel wire by wire or wirelessly through the tensional force loss amount detection sensor, The work can be done easily.

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: Continuous bridge that can re-tighten the outer steel wire
110: Pier
120: Schedule support
130: Concrete girder (concrete structure)
130a: first concrete girder
130b: second concrete girder
140: Lifting hole
150: First fixing member (for reinforcement of upper and lower marks)
160: 1st outer steel wire (threaded strand)
161: Manshone (Sleeve)
170: first fixing nut for screw type steel wire
180: second fixing member (for reinforcing the momentum)
190: Second outer steel wire (threaded strand)
210: second fixing nut for a threaded steel wire
220: First tensional force loss detection sensor
230: second tensional force loss detection sensor
310: field terminal
320: Remote Measurement Center
315: Indicator
316: Solar module

Claims (12)

First and second concrete girders (130a, 130b) arranged at predetermined intervals on the piers (110) and each having a lifting hole (140) facing each other;
A first fixing member 150 installed at a lower side or a side surface of the lower end of the lifting hole 140 for reinforcing the upper ends of the first and second concrete girders 130a and 130b;
A second fixing member 180 installed at an upper end of the lifting hole 140 for reinforcing the momentum of the first and second concrete girders 130a and 130b;
A first outer steel wire 160 which is fixed by the first fixing nut 170 and is fixed to the first fixing member 150 to introduce a tension force for reinforcing the upper ends;
A second outer steel wire 190 fixed to the second fixing member 180 and introduced with a tensile force for strengthening the momentum, being a threaded strand fixed by the second fixing nut 210; And
First and second torsional loss detection sensors 220 and 220 installed at one side of the first and second outer steel wires 160 and 190 for detecting a torsional loss of the first and second outer steel wires 160 and 190, 230)
Wherein the first and second outer steel wires (160, 190) are re-tensioned when the first and second tension loss detection sensors (220, 230) detect a tension loss amount greater than a set value. Continuous bridges that can be used to tie outer liners. The method according to claim 1,
The first and second fixing members 150 and 180 are made of a hot-dip galvanized material for preventing corrosion, and the first and second hot-dip galvanized fixing members 150 and 180 are made of the first and second And is installed in a lifting hole (140) of a concrete girder (130a, 130b) by using a steel bar. The method according to claim 1,
Wherein the first and second outer steel wires (160, 190) are linearly arranged with threaded strands integrated in the cold extrusion process. The continuous steel wire strand can be tensioned by measuring the amount of tensile force loss. The method of claim 3,
The first and second fixing nuts 170 and 210 for fixing the first and second outer steel wires 160 and 190 are fastened by threading the mandrels 161 at the ends of the threaded strands , Which can measure the amount of tensile force loss and tension the outer steel wire. The method according to claim 1,
The first and second tensional force loss detecting sensors 220 and 230 may be any one selected from a load cell 220a, a hot spring 220b in the form of a plate or a coil, or a strain gauge 220c Which can measure the amount of tensile force loss and tension the outer steel wire. 6. The method of claim 5,
The load cell 220a and the plate or coil type hot spring 220b may include first and second fixing nuts 170 and 210 for fixing the first and second outer steel wires 160 and 190, And the second fusing member (150, 180), respectively. The continuous fusing unit can measure the amount of the torsional force loss and can tense the outer steel wire. 6. The method of claim 5,
And the strain gage 220c is installed on one side of the first and second outer steel wires 160 and 190. The strain gauge 220c measures the amount of strain loss to continuously tension the outer steel wire. 6. The method of claim 5,
The amount of the tensional force loss detected through the first and second tensional force loss detecting sensors 220 and 230 can be detected by the field terminal 310 having the indicator 315, 320), and is characterized in that it is transmitted wirelessly. 9. The method of claim 8,
The field terminal (310) uses a power source or a battery power charged through the solar cell module (316). The on-site terminal (310) measures the amount of tensional force loss to continuously tension the outer steel wire. A method of constructing a continuous bridge capable of tensioning an outer steel wire by measuring a tension loss of a concrete girder,
a) installing first and second concrete girders (130a, 130b) on the piers (110), each of which is equipped with a first fixing member (150) for reinforcing upper ends;
b) installing a second fixation member (180) for strengthening the momentum on top of the lifting hole (140) of the first and second concrete girders (130a, 130b);
c) mounting the first and second outer steel wires (160, 190) formed of a threaded strand to the first and second fixing members (150, 180), respectively;
d) installing first and second tensional force loss detection sensors (220, 230) on one side of the first and second outer steel wires (160, 190);
e) applying tension to the first and second outer steel wires (160, 190) and performing subsequent work to complete the continuous bridge;
f) a torsional loss amount of the first and second outer steel wires (160, 190) corresponding to a decrease in the moment and moment of the first and second concrete girders (130a, 130b) Simultaneously measuring the detection sensors 220 and 230;
g) comparing the measured amount of tensional force loss with a set value to determine whether a tensional loss amount has occurred; And
h) reinforcement of the moment and moment of the first and second concrete girders (130a, 130b) by re-tensioning the first and second outer steel wires (160, 190)
Wherein the outer steel wire is tensioned by measuring the amount of tensile force loss. 11. The method of claim 10,
The first and second tensional loss detection sensors 220 and 230 of the step d) may be selected from a load cell 220a, a hot spring 220b in the form of a plate or a coil, or a strain gauge 220c Wherein the outer steel wire is tensioned by measuring the amount of tensile force loss. 12. The method of claim 11,
The load cell 220a and the plate or coil type hot spring 220b may include first and second fixing nuts 170 and 210 for fixing the first and second outer steel wires 160 and 190, And the second fixing members 150 and 180, respectively,
The strain gage 220c is installed on one side of the first and second outer steel wires 160 and 190,
The amount of the tensional force loss detected through the first and second tensional force loss detecting sensors 220 and 230 can be detected by the field terminal 310 having the indicator 315, 320). The method according to any one of claims 1 to 3, wherein the outer steel wire is tensioned by measuring the amount of tensile force loss.

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