KR100682341B1 - Rehabilitation structure of bridge beam by using of a combined saddle and middle fixation braket - Google Patents

Abstract

The present invention relates to a repair and reinforcement structure of a bridge beam using a saddle dual fixing bracket.

The present invention provides an end fixing bracket installation step of installing an end fixing bracket by anchor bolts by forming a plurality of fixing grooves with a drill in the middle side portions of both ends of the bridge beam damaged due to aging; A saddle combined intermediate fixing bracket installation step of forming a plurality of grooves at both sides of a predetermined point at an inner side from both ends of the bridge beam in which the end fixing bracket is installed to install a saddle combined intermediate fixing bracket with an anchor bolt; The first tension member is fastened to the support recess formed between the "a" shaped wing piece of the saddle combined intermediate fixing bracket installed on both sides of the bridge beam lower side, and both ends of the first tension material are passed through the first fixing hole of the attachment rod. A first tension member installation step of tensioning the first tension member by both means and fixing the first tension member to the first fixing cone; Passing both ends of the second tensile material through the second fixing hole of the saddle combined intermediate fixing bracket, and the second tension member installation step of tensioning both ends by the tension means to fix the second fixing cone, the upward force and the compressive force on the bridge beam This is to generate the additional compressive force and to repair the cracks generated in the lower center of the bridge beam, and to improve the deflection and reinforcement of the rigidity.

End mounting bracket, Saddle interlocking bracket, Tension material

Description

Repair beam reinforcement structure of bridge beam using saddle intermediary fixing bracket {REHABILITATION STRUCTURE OF BRIDGE BEAM BY USING OF A COMBINED SADDLE AND MIDDLE FIXATION BRAKET}

1 is a front view showing the maintenance structure of the bridge beam according to the present invention.

Figure 2 is a bottom perspective view showing a reinforcement structure of the bridge beam according to the present invention.

3,4 is a front and rear perspective view of the end fixing bracket used for bridge beam repair reinforcement according to the present invention.

5 and 6 are a front and rear perspective view of the saddle combined intermediate fixing bracket used for bridge beam reinforcement according to the present invention.

7 is a flow chart illustrating a method for repairing and strengthening a bridge beam according to the present invention.

<Simple explanation of the code | symbol about the main part of drawing>

1: End mounting bracket 2: Saddle combined mounting bracket

3: first person material 4: second person material

5: Bridge beam 6: Anchor bolt

11: support plate 12: mounting table

13,13 ': First reinforcement 21: bottom plate

22: Through hole 23, 23 ': Side plate

24: Jiyo Home 25: Wings

26,26 ': 2nd reinforcement 27: lower settling platform

31: First fixing cone 41: Second fixing cone

111: fixing hole 112: anchor hole

121: first fixing hole 271: second fixing hole

The present invention relates to a repair and reinforcement structure of a bridge beam using a saddle combined intermediate fixing bracket, and in particular, a saddle combined intermediate fixing bracket fixed to both sides of a predetermined point into an end fixing bracket fixed to a middle portion of both ends of the bridge beam. After tensioning on both ends of the bracket, the fixing cone is fixed to both end fixing brackets so that upward force and compressive force are generated, and the other tensioning material is tensioned between the saddle combined intermediate fixing bracket and the saddle combined intermediate fixing bracket to provide the saddle combined intermediate fixing bracket By fixing to, additional compressive force is generated in the configuration in which upward and compressive forces are generated in the bridge beam, thereby improving cracks and deflections in the center of the bridge beam, and further enhancing the rigidity of the bridge beam by the compressive force. And reduce the number of parts and tension members required to reinforce bridge beams. It will have to reduce the speed and cost.

In general, recent bridges have cracks and deflections in the lower center of the bridge beam due to external factors different from the time of the design construction of the bridge, such as the increase in passing vehicles, the increase in traffic volume, and the aging of the bridge beam itself. As a result, most of the old bridges are in a reality in which the risk of unexpected accidents remains.

Therefore, in the case of aging bridges, the bridge beams in which cracks and sags or the stiffness are generated or reduced in stiffness are restored to the original state or the stiffness of each beam is increased in order to prevent accidents, rather than emergency repair after accidents. There is an urgent need for the repair and reinforcement of bridge beams.

To this end, in recent years, an external prestressing method using an external tensile force has been introduced to effectively correct the deflection of the existing aging bridge.

This method is a method that provides the restoring force to offset the deflection generated in the center of the bridge by applying a compressive force to the bridge by tensioning and fixing the strands installed along the longitudinal direction of the bridge can effectively enhance the load capacity of the bridge have.

However, since the tension member for introducing the tensile force is mainly settled at both ends of the beam of the bridge, the problem of concentration of acupressure due to the stress concentration phenomenon at both ends is more serious, and the problem is that both ends are broken by the pressure over time. Occurred.

In order to solve this problem, Korean Patent Registration No. 37332 (2002.10.7) has proposed a method for reinforcing external tension material of a bridge beam using a multi-stage fixing device and a device thereof (hereinafter referred to as "multistage fixing device"). The proposed multi-stage fixing device secures both end anchoring brackets by dispersing the acupressure stress concentrated at the end fixing brackets at both ends of the bridge beam into intermediate fixing brackets which are respectively installed inside both end fixing brackets and both end fixing brackets. It has the advantage of reducing the number of anchor bolts to reduce damage on both ends of the bridge beam and effectively reinforcing the rigidity at the center of the bridge beam by the compressive force by the tension member installed in the intermediate fixing bracket and the intermediate fixing bracket.

However, such a reinforcement device has a small compressive force due to the prestress of the tension member only in the lower portion of the bridge beam, so that upward force does not occur with respect to the bridge beam.

Therefore, there is a problem that cracks and sag progresses quickly even after the reinforcement of the bridge beam because crack bridge repair, that is, the effect of closing the cracks and improving the deflection is less effective.

In addition, fixing the tension member using components such as fixing cone, push washer, spring, and fixing head cap on the intermediate fixing bracket, and fixing the tension member again using the fixing cone on the end fixing bracket has a cost of using many parts. There was an increasing problem.

In addition, the construction cost is increased due to the complexity of construction and the use of a long tension member such as the use of many parts, such as the use of a lot of tension members by extending the tension member such as the PC steel wire to be fixed to the intermediate fixing bracket to the end fixing bracket. There was another problem.

The present invention was created in order to solve such a problem, and after the tension member is stretched on the saddle combined middle fixing bracket fixed to both sides at a predetermined point inside the end fixing bracket fixed to the middle portion of both ends of the bridge beam. By fixing with an anchoring cone to the end fixing bracket, upward and compressive forces are generated, and another tensioning material is tensioned between the saddle combined intermediate fixing bracket and the saddle combined intermediate fixing bracket to fix the saddle combined intermediate fixing bracket to the bridge beam. The additional compressive force is generated in the configuration that generates the upward force and the compressive force to improve the crack and deflection of the lower center of the bridge beam, and the additional compressive force to obtain the effect of further strengthening the rigidity of the bridge beam. Shorten the air and reduce the cost by reducing the number of parts and tensioning materials required to reinforce the beam. To be provided by the rehabilitation of the bridge beam structure using a Combine birds intermediate fixing bracket so that it is an object.

In order to achieve the above object, the present invention provides an end fixing bracket installation step of installing an end fixing bracket by anchor bolts by forming a plurality of fixing grooves with a drill in the middle side portions of both ends of the bridge beam damaged due to aging; Installing a saddle combined intermediate fixing bracket for installing a saddle combined intermediate fixing bracket by anchor bolts by forming a plurality of grooves at both ends of a predetermined point inward from both ends of the bridge beam in which the end fixing bracket is installed; The first tension member is fastened to the support recess formed between the "a" shaped wing piece of the saddle combined intermediate fixing bracket installed on both sides of the bridge beam lower side, and both ends of the first tension material are passed through the first fixing hole of the fixing unit. A first tension member installation step of tensioning the first tension member by both means and fixing the first tension member to the first fixing cone; Using both saddle interlocking bracket consisting of the second set of mounting material to pass the two ends of the second lining material through the second fixing hole of the saddle combined middle fixing bracket, and to tension both ends by the tension means to fix the second fixing cone. The object is achieved by providing a method for repairing bridge beams.

In addition, the end fixing bracket is fixed to the middle of the side of the bridge beam by the anchor bolts, and the saddle combined middle fixing bracket by the anchor bolt on both sides of the predetermined point inward from the both ends of the bridge beam in which the end fixing bracket is installed The first tension member tensioned to the end fixing bracket and the saddle combined middle fixing bracket is configured to be fixed to the first fixing cone, and the second tension member stretched between the saddle combined middle fixing bracket is the second fixing cone. The object is achieved by providing a repair structure of the bridge beam using the saddle combined intermediate fixing bracket, characterized in that it is configured to be fixed to.

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

As shown in FIGS. 1 to 6, the repair structure of the bridge beam using the saddle combined intermediate fixing bracket according to the present invention includes an end fixing bracket 1, a saddle combined intermediate fixing bracket 2, and a first and second tensile material ( 3) (4) and the first and second fixing cones (31) (41).

Here, the end fixing bracket (1) is installed on the middle of both sides of the aging bridge beam (5) to be mounted on the top of the pier (7), the middle of the bridge beam height 3, 4 As shown in the drawing, the support plate 11, the fixing table 12, and the first reinforcing pieces 13 and 13 'are integrally formed.

In the above, the end fixing bracket 1 is preferably installed at both ends of the side portion, but may be provided at the upper portion of the intermediate portion.

The support plate 11 is fixed to be in close contact with the left and right sides of the bridge beam (5) is formed to have a rectangular shape, and fixing holes 111 and a plurality of anchor holes 112 are formed on both sides thereof, respectively. In addition, the anchor hole is formed in both the upper and lower sides of the fixing hole 111, and has a structure that can increase the fixing force.

The fixing table 12 is fixed to the first tensile member 3 and is provided in a vertical direction with respect to the support plate 11, and a first fixing hole 121 is integrally formed at the center thereof.

The first reinforcing pieces 13 and 13 ′ are in a direction opposite to the direction in which the fixing hole 111 is formed by preventing the fixing table 12 from being damaged by the tensile force acting on the first tensile member 3. A plurality of first reinforcing pieces 13 and 13 'having a triangular shape at is formed at regular intervals.

In addition, the saddle combined intermediate fixing bracket (2) is the both ends of the bridge beam (5) in order to be provided with an upward force and a compressive force to the bridge beam (5) by simultaneously hanging the first tension member (3) and the second tension member (4) 5, 6, the bottom plate 21, the side plate 23, the wing piece 25, the second reinforcing piece 26 and the lower fixing table 27).

The predetermined point provided inwardly is preferably the bad quarter of the bridge beam.

Here, the bottom plate 21 is in contact with the lower portion of the bridge beam 5 so that the side plate 23 having a form bent upward on both sides so that the bottom plate 21 can touch the lower both sides of the bridge beam (5). The front, rear, and top portions are formed to have the shape of a popped rectangle.

The side plate 23 has a plurality of through-holes 22 are formed to fix the bottom plate 21 formed at the bottom with anchor bolts on both sides of the lower portion of the bridge beam 5, the wing piece 25 is a side It is formed to take the form of a "b" provided with support grooves 24 on both sides of the plate 23 so as to prevent the first tension member 3, which is caught between the end fixing brackets 1, from being peeled off or separated. It is composed.

In addition, the blade piece 25 takes a state parallel to the bottom plate 21 to the middle with respect to the entire length of the side plate 23, it is configured to have an inclination rising toward the top of the side plate 23 after the middle. do.

The second reinforcing piece 26 is to prevent the blade piece 25 from being damaged by the tensile force acting on the first tensile material 3, the upper part of the blade piece 25 and the upper side of the side plate 23. It is configured to have a plurality of triangular shapes in between.

The lower mounting stand 27 is for fixing the second tension member 4 and fixed to the lower portion of the bottom plate 21 by a rectangular third reinforcement piece 28 having a free end side cut at a predetermined angle. And a plurality of second fixing holes 271 are provided.

The first and second tensile material (3) (4) is composed of a plurality of strands of PC steel wire or PC strands, the first and second fixing cones (31) (41) is a three-part divided into a tapered shape on the outside Consists of fasteners having a shape divided into.

When explaining the repair process of the bridge beam using the saddle combined intermediate fixing bracket having such a configuration step by step as follows.

First, in step S10 of installing the end fixing bracket on the bridge beam 5, the end fixing bracket 1 is installed with the anchor bolt 6 at the middle portion of the side ends of the bridge beam 5 damaged due to aging.

Next, install the saddle combined intermediate fixing bracket for installing the saddle combined intermediate fixing bracket (2) with anchor bolts (6) at both lower ends of the predetermined point inward from both ends of the bridge beam (5) in which the end fixing bracket (1) is installed. Through the step (S20) it is prepared to connect and fix the first and second tensile material (3) (4).

Next, the support groove formed between the "a" -shaped wing piece 25 and the side plate 23 of the saddle combined intermediate fixing bracket 2 installed on both sides of the lower portion of the bridge beam (5) in the first tensile material installation step (S30). The first tension member 3 is fastened to the first tension member 3, and both ends of the first tension member 3 are passed through the first fixing holes 121 of the fixing table 12, using a hydraulic jack or the like which is a tensioning means. 3) is tensioned to both sides and then fixed to the fixing table 12 with the first fixing cone (31).

In this case, as the upward force and the compressive force are generated in the bridge beam 5 by the tensile force of the first tensile material 3, the crack and deflection of the bridge beam 5 are restored.

Next, both ends of the second tensile material 4 are passed through the second fixing hole 271 of the saddle combined intermediate fixing bracket 2 in the second tensile material installation step (S40), and both ends thereof are provided with a hydraulic jack as a tension means. By using the second fixing cone (41) to fix on both sides of the saddle combined intermediate fixing bracket to complete the repair of the aging bridge beam, which adds an additional compressive force to reinforce the rigidity of the bridge beam will be.

Meanwhile, in the present invention, the bridge beam 5 is repaired by fixing the second tension member 4 to the saddle-purpose intermediate fixing bracket 2, but then the upward force of the first and second tension members 3 and 4 is maintained. And when the epoxy resin is injected into the crack crack portion closed by the compressive force may further reinforce the crack portion.

Thus, in the present invention, the tension member is hooked and tensioned on the saddle combined intermediate fixing bracket fixed to both sides at a predetermined point inside the end fixing bracket fixed to the middle portion of both ends of the bridge beam, and then fixed with fixing cones at both end fixing brackets. The upward force and the compressive force is generated, and in addition, the tension member is tensioned between the saddle combined intermediate fixing bracket and the saddle combined intermediate fixing bracket and fixed to the saddle combined intermediate fixing bracket, thereby generating the upward and compressive force in the bridge beam By generating additional compressive force on the bridge, the cracks and deflections in the center of the bridge beam are improved, and the additional compressive force further enhances the rigidity of the bridge beam.

In addition, by using the intermediate fixing bracket for the saddle combined use of the intermediate fixing bracket, it is possible to obtain the effect of reducing the number of parts and tension materials required for the reinforcement of the bridge beam and shorten the air and reduce the cost.

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Claims (5)

delete delete delete delete The end fixing bracket 1 is fixed to the both ends of the bridge beam 5 with anchor bolts 6, and both ends of the predetermined point are inward from both ends of the bridge beam 5 in which the end fixing bracket 1 is installed. The saddle combined middle fixing bracket 2 is fixed to the lower part with an anchor bolt 6, but the saddle combined middle fixing bracket 2 has side plates formed with through holes on both sides of the bottom plate 21, before and after the top. 23) (23 '), and form a "b" shaped wing piece 25 provided with a support groove 24 in the outer lower portion of the side plate 23, the upper portion of the wing piece 25 And a lower fixing table having a plurality of second reinforcing pieces 26 and 26 'integrally formed between an upper portion of the side plate 23 and a second fixing hole 271 in the lower portion of the bottom plate 21. (27) and the third reinforcing piece (28) for reinforcing the lower fixing table (27) are integrally formed and at the same time the middle and later of the wing piece (25) is upwardly outward. It is configured to have an inclined toward the high, and the first saddle (3) on the saddle combined intermediate fixing bracket (2) is configured to be fixed to the end fixing bracket (1) with one fixing cone (31), the saddle combined middle Repair of the bridge beam using the saddle combined intermediate fixing bracket, characterized in that the second tensile member 4 is configured to be fixed by the second fixing cone 41 between the fixing bracket 2 and the saddle combined intermediate fixing bracket 2. Reinforcement structure.

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