KR20200043293A - Reinforcing method and reinforced structure of hinge portion in prestressed concrete girder bridge - Google Patents

Abstract

An objective of the present invention is to provide a drastic reinforcing method of a hinge portion to almost perfectly reinforce the hinge portion, prevent sagging or damage and degradation exceeding design values during construction and in common use by a reinforcing structure for making an entire bridge continuous, and secure safe and pleasant driving. A prestressing steel member (6) is arranged up to a required length in both longitudinal directions across a prescribed range of pouring concrete of a bridge girder (2), and is tensioned and fixed to create elastic tension. Then jacks are installed at required places within the prescribed range. A compressive force is assigned to both bridge girder end surfaces in the range by extrusion of the jacks, and elastic tension is further increased in the prestressing steel member (6). Concrete (10) is poured and hardened in the range while extruding the jacks. The jacks are loosened and removed after the concrete (10) hardens to liberate the compressive force assigned to both bridge girder end surfaces in the range and the elastic tension created in the prestressing steel member (6) to be assigned to the concrete (10) within the range as prestress.

Description

Reinforcement method and reinforcement structure of the hinge part in a prestressed concrete girder bridge {REINFORCING METHOD AND REINFORCED STRUCTURE OF HINGE PORTION IN PRESTRESSED CONCRETE GIRDER BRIDGE}

The present invention relates to a method of reinforcing the hinge portion and a reinforcing structure in a PC (prestressed concrete) hinge girder bridge, regardless of whether it is new or existing.

Continuous prestressed concrete girder bridges with hinges in the center of this kind of span can be constructed from hinges at arbitrary piers, and can be divided, and the cross-section force is common with construction ( It has the advantage of almost coinciding with 시 에 用). In addition, a suitable hinge is inserted in the middle of the span of the continuous girder bridge. There is a gerber girder bridge, and since it has a hinge, it has a statically determined structure. It has the advantage of being advantageous because the deformation does not occur and the overall mold height is reduced.

The continuous prestressed concrete girder bridge having the above-mentioned hinge portion has been constructed a lot from the past, but recently, the weight limit of the passing vehicle is relaxed and rises, so that the hinge portion is damaged, or there is a lot of moisture supply from rainwater from the bridge. Therefore, since the phenomenon of deterioration of the hinge portion has rapidly increased, it is necessary to perform reinforcement. In addition, on a highway, it is required to make a so-called joint elimination, so that when the vehicle is traveling at a high speed, noise or vibration generated from the hinge portion hinders the driveability, so that the hinge portion is continuous to increase the driveability. have.

In addition, in the case of a new construction, when it is not possible to construct a jibo-gong because it is restricted to the location of the bridge, a bridge girder cantilever from the top of the bridge to the left and right. ), The so-called cantilever overhanging construction method, which sequentially builds blocks by block, is employed. In this method, a previously installable rail is temporarily fixed on a bridge body block, and a movable work vehicle (wagen) is installed on the rail so that it can be moved back and forth. From a mobile work vehicle, the formwork support member or scaffold of the next new replacement block is suspended forward and suspended and supported on the support member, such as formwork, rebar, prestressing tendon, etc. It is known to build a cast-in-place overhanging construction girder bridge by assembling, pouring concrete and introducing prestress to the block.

Therefore, since the central closure portion between the diameters of the elongated construction in the cantilever state is in a hinge state and remains in the form of a cantilever beam, vibrations due to constantly received vehicles, wind, etc. are uneven. In addition, it is not only easy to break, but also requires frequent maintenance, so that the running cost becomes high, and it has a problem to be solved by making a closed section which is hypothesized from both sides and abutting in the central part into a solid one section.

Various proposals have been made for the reinforcing structure of the hinge portion and the reinforcing method.

As a proposal for a new girder bridge, in a bridge constructed by a long-term hypothesis, the main girder cross section of the central section serving as a closed section between diameters penetrates the section below the cross section of the central section. Thus, it is an SPC girder bridge structure characterized in that prestressing is applied to the main mold by placing prestressing steel in a curved shape over the top surface of the adjacent replacement block and being tensioned (see Patent Document 1). ).

According to this structure, the prestress is provided to the entire cross-section of the central closed portion by passing through the central section between diameters of the pre-stressed steel material disposed on the upper section of the main cross-section. ) When used as a road, even when tensile stress occurs at the upper and lower ends of the cross section due to vibration loads of a large vehicle or wind, it is erased to secure the safety and durability of the entire bridge. It is said that you can.

In addition, as a proposal for the existing bridge, the existing hinge portion is cut and removed at a predetermined refreshing range, and a frame surrounding the jack is provided with a jack at a required location within the refreshing range, and the Compressing force is applied to the cross-sections on both sides of the replenishing range by extrusion of the jack, and concrete is poured into the replenishing range in the state where the jack is extruded to harden it. It is a method of reinforcing the hinge portion of an existing girder bridge, characterized in that prestress is applied to concrete within the replenishing range by being removed (see Patent Document 2).

According to this reinforcing method, in a state in which a jack is installed and extruded in a repeating area (replacing area), that is, the stroke is extended by actuating the jack, and the cross section of both sides of the refreshing range is extruded by jack extrusion. Construction of the replenishing unit by applying prestress to concrete within the replenishing range by pouring concrete in a state where compression is being applied, and loosening the jack (returning it based on the extended stroke) and removing it after curing the concrete. It suppresses the occurrence of initial cracking in the city and cracking in common use, and prevents deterioration of concrete due to the supply of water such as rainwater from the bridge. Also, the tensile force is easily generated in the refreshing part where the hinge is continuous. That is, the effect of contributing to the improvement of stress is remarkable.

Japanese Patent No. 52162161 Japanese Patent No. 5716117 Patent Publication

In the technique of Patent Document 1, the hinge of the continuous prestressed concrete girder bridge is formed by tensioning and arranging prestressing steel in a curved shape across the upper surface of the adjacent replacement section through the section under the cross section of the central section. Although the stress of the central closed portion including the portion has been improved, after the central closed portion is completed, the dry shrinkage of concrete occurring in the direction of the bridge axial during construction, in order to settle the tension by arranging the curved prestressing steel. In addition, it is not only possible to suppress deformation or creep deformation, but also sag that exceeds the design value generated in the central closed portion including the hinge portion during construction (under load); drooping] has a problem that it cannot be lifted.

Also in the technique of patent document 2, there is only a jack without a connecting steel material within the replenishing range during construction, and since the jack is held between objects to suppress the elongation deformation occurring in the opposite direction, the opposite direction is used. Since there is no effect on the shrinking of both spaces, it is difficult to maintain the extrusion force of the jack because it does not suppress the dry shrinkage or creep deformation of the concrete after pouring. Since the prestress applied to the concrete by the extrusion force of the jack does not become a predetermined value, there is a possibility that the hinge portion sags beyond the design value.

Accordingly, the present invention provides a method of reinforcing the hinge portion to provide a method of reinforcing the hinge portion to provide a method of reinforcing the whole of the bridge, and to provide a sequential reinforcement structure for sequencing the entire bridge. The objective is to prevent sagging, breakage, and deterioration exceeding the design value, and to ensure safe and comfortable driving performance.

As a specific means for solving the problems of the above-mentioned conventional examples, the present invention is a method for reinforcing a hinge portion in a prestressed concrete girder bridge, to a required length in a bridge axial direction on both sides over a predetermined range that becomes a hinge portion before pouring concrete. After the pre-stressed steel is disposed and tension-fixed to create elastic tension in the pre-stressed steel, a jack is installed at a required location within the above-mentioned predetermined range, and the cross-sections on both sides of the range are extruded by the jack. By applying a compressive force, and further increasing the elastic tension in the prestressing steel material, the concrete is poured into the above-mentioned range in the state in which the jack is extruded to cure, and after the concrete is cured, the jack is released to remove both sides of the range. The compression force applied to the cross-section of the and the prestressing steel Machine tools as prestressed and releases the elastic tension to provide a prestressed concrete girder bridge of the hinge portion reinforcing characterized in that which is to be added to the concrete in the range.

In the invention of the method of reinforcing the hinge portion, it is to include, as an additional requirement, arranging steel steel materials to a required length in the throttle direction on both sides over the predetermined range, and integrating the bridge with supplemental concrete.

In addition, in the present invention, as a reinforcing structure of the hinge portion in the prestressed concrete girder bridge, the prestressed steel material is arranged to the required length in the throttle direction on both sides over a predetermined range to be the hinge portion before the concrete is placed, and tension is set to fix the elastic tension on the prestressed steel material. After this occurs, a jack is installed at a required location within the above-mentioned predetermined range, and compression force is applied to the cross-sections on both sides of the range by extrusion of the jack, and also, the prestressing steel material has more elastic tension, and the jack is provided. In the extruded state, concrete is poured into the above range to harden it, and after the concrete is hardened, the compression force applied to the cross-sections on both sides of the range and the elastic tension generated in the pre-stressed steel material are released to release the jack. Cone within the above range To provide a hinge portion of the reinforcing structure, prestressed concrete girder bridge, characterized in that assigned to the agent

In the invention of the hinge-reinforced structure, steel steel materials are arranged to the required length in the throttle direction on both sides over the predetermined range, and include as an additional requirement to integrate the bridge with supplementary concrete.

According to the hinge part reinforcement method and reinforcement structure which concerns on this invention, the effect shown below can be acquired.

1, after a predetermined range for pouring concrete including a hinge portion as a reinforcing range, prestressing steel is first placed to a required length in the throttle direction on both sides over the above range, and tension is settled to create elastic tension in the prestressing steel, The state in which the jack is installed and extruded, that is, the stroke is extended by actuating the jack to exert compression force on the cross-sections on both sides of the (reinforcement) range by extruding the jack, and further increase the elastic tension on the prestressed steel The concrete is poured and cured, and after the concrete is cured, the compressive force applied to the cross-sections on both sides of the (reinforcement) range and the elastic tension generated in the pre-stressed steel material are released by releasing and removing the jack. By adding to the concrete within the range, the phase including the hinge portion Within the range, from the start of concrete pouring to hardening, not only the extrusion force of the jack, but also the elastic tension of the pre-stressed steel material is generated, and the elastic tension is always the force to revert to the concrete within the (reinforcement) range. Since it acts as a compressive force, it compensates for the loss of the extrusion force of the jack due to dry shrinkage or creep deformation of the concrete after pouring, effectively suppressing the deformation of the concrete, releasing the jack after curing the concrete, and compressing and prestressing the released jack The elastic tension of the steel material is changed to a predetermined prestress and can be applied to the concrete within the above-mentioned (reinforcement) range, so that it is possible to reliably prevent sagging during construction as well as during construction.

2, By arranging the pre-stressed steel material, a part of the pre-stress applied to the concrete within the above-mentioned (reinforcement) range can be produced in the pre-stressed steel material, thereby reducing the capacity and number of jacks, improving workability and reducing cost. You can.

3, by releasing the compressive force applied to the cross-sections of both sides of a predetermined range for pouring concrete including the hinge portion and the elastic tension generated in the pre-stressed steel material and giving it to the concrete within the (reinforcement) range as prestress, thereby (reinforcement) By suppressing the initial cracking during construction and cracking in common, the deterioration of concrete due to water supply such as rain water from the bridge can be prevented, and the tensile force is not easily generated in the reinforcement range where the hinge is continuous. It becomes a state, and the effect which contributes to stress improvement is remarkable.

4, By arranging the steel steel in a predetermined range including the hinge portion, the cross-section cross-section strength of the predetermined range is greatly improved, and since the hinge portion is in a continuous state, an excellent effect of preventing damage in common can be obtained. You can.

5, Since the hinge portion is continuous, noise and vibration generated in high-speed driving of the vehicle can be reduced, so that an excellent effect of ensuring safe and comfortable driving performance can be obtained.

Figure 1 is a pre-stressed concrete girder bridge is already installed a general box girder (box girder) to which the present invention is applied, (a) shows an existing girder bridge having a hinge portion in the middle of the span, (b) two places in the middle It is an explanatory diagram respectively showing the existing bridges having a hinge portion.
FIG. 2 shows a first embodiment of the reinforcing method according to the present invention, (c) is an explanatory diagram showing an enlarged point of the method for reinforcing the hinge portion according to (a) of FIG. 1, and (d) is (c) ) Along the line AA.
FIG. 3 shows the above embodiment, and (e) is an enlarged explanatory view by removing a portion to reinforce the hinge portion according to (a) of FIG. 1, and (f) is along line BB of (e). It is a cross section.
Fig. 4 shows the above embodiment, (g) is an explanatory view showing the situation of the reinforcement procedure I of the hinge portion according to Fig. 3 (e), and (h) is a sectional view along the CC line of (g).
Fig. 5 shows the above embodiment, (i) is an explanatory diagram showing the situation of the reinforcement procedure II of the hinge portion, which is followed in Fig. 4 (g), and (j) is the DD line of (i) It is a sectional view along.
FIG. 6 shows the above-described embodiment, (k) is an explanatory diagram showing the situation of the reinforcement procedure III of the hinge portion, continuing from FIG. 5 (i), and (l) is a cross-sectional view along the EE line of (k). .
Fig. 7 shows the above-described embodiment, (m) is an explanatory view showing the situation of the reinforcement procedure IV of the hinge portion, continuing from Fig. 6 (k), and (n) is a sectional view along the FF line of (m) .
FIG. 8 shows the above-described embodiment, and is enlarged by removing a portion to reinforce the hinge portion as shown in FIG. 3 (e), and is an explanatory view of the front side where the reinforcing bar is installed in the hinge portion.
9 shows the above embodiment, (o) is an explanatory view showing a state in which a reinforcing bar is arranged in a hinge portion to be reinforced, and (p) is a cross-sectional view along the line GG in (o).
10 is a second embodiment of a reinforcing method according to the present invention, (q) is an explanatory diagram showing an enlarged state in which steel steel is disposed in a hinge portion to be reinforced, (r) is (q) It is a sectional view along the HH line.

A plurality of embodiments according to the embodiment showing the present invention will be described. First, the shape of the hinge portion will be described with reference to Figs. 1A and 1B. For example, (a) shows the PC bridge 2 hypothesized on the pier 1, and the bridge 2 is composed of the most common box girder, and the hinge portion 3 is located at the center of the jig. (B) has hinges (3, 3) in the middle of the bridge (2).

In reinforcing the hinge portion 3 of the PC bridge 2 as described above, in the case of the existing bridge, as shown in Fig. 2 (c), the bridge 2 of both sides including the hinge portion 3 As a refreshing range, it is cut off and cut over a predetermined range (4). The split cutting in this case is, for example, in a state in which a portion to be cut by a hypothetical strut is supported, for example, split cutting using a cutting means such as a wire saw. Then, the divided and cut portion is suspended by a crane and taken out.

As shown in Fig. 2 (d), the rebar 5 and the existing prestressing steel (not shown) that were installed in the PC mold 2 are cut on the cut surfaces on both sides of the mold 2, and the cross section thereof is cut. ) Is exposed. On the cut surface of the bridge (2), the required thickness of the concrete is cut out by a water jet, and the reinforcing bar (5) and the pre-stressed steel are protruded to the required length, and for the pre-stressed steel, a wedge-type anchorage is provided at the distal end thereof. ) To reset. And, for the existing pre-stressed steel, it is settled only by attaching it with a grout until it is removed and resettled, so check the condition of the already installed grout and perform the grout recharging operation as necessary. There is also.

In the case of the new bridge 2, as shown in Fig. 3 (e), the central closed portion is shown as an example.

Also in this case, a necessary space is set by setting a predetermined range 4 including the hinge portion 3 as a reinforcing range between the ends of the bridges 2 on both sides supported. That is, the cross-section of the bridge 2 constructed by the construction method protruding from both sides is exposed (projected) of the reinforcing bar 5 for a required length from the beginning. The situation of the reinforcement of the reinforcing bar 5 in the cross section of the bridge 2 is shown in Fig. 3 (f) as seen from the line B-B. In addition, although not shown, a plurality of prestressing steels are disposed in the constructed bridge 2 and are tension-fixed using a fixer on the end face of the bridge 2.

As described above, the end portions of the existing and newly constructed bridges 2 are formed in substantially the same state (structure).

Next, the procedure (step) of reinforcing the hinge portion 3 of the present invention will be described with reference to Figs.

[Procedure I]

As shown in (g) and (h) of FIG. 4, in order to pour concrete on the part which becomes the hinge part 3, a bridge 2 constructed by a construction method that leaves a predetermined range 4 and protrudes from both sides (2) In, a plurality of prestressing steel materials 6 are arranged to a required length in the throttle direction, and an anchoring portion 7 is provided at the end of the mold 2 to tension and fix the ends of the prestressing steel materials 6 . The fixing unit 7 in this case may be either a forced block or a concrete block, or may be supplemental concrete.

In the fixing section 7, for example, a necessary fixing tool 8 such as a nut is disposed to tension-fix the prestressing steel 6. In the city, the prestressed steel 6 is made of a PC steel bar, but may be a PC cable made of a PC steel wire. In the case of using a PC steel bar, it is preferable to adhere to a steel pipe sheath outside the PC steel bar to form an outer cable system. In addition, in the case of using a PC stranded wire, the PC stranded wire having a synthetic resin rustproof coating film formed on the core and side lines of the PC stranded wire, respectively, is also coated with polyethylene and subjected to PE coating. Use a small wire anti-corrosion painted PC steel wire, a so-called unbonded double anti-corrosive PC steel wire. In this case, it is possible that a steel pipe sheath is not required outside of a PC cable made of a PC stranded wire. As shown in the figure, by tension-fixing the prestressing steel 6, an elastic tension (arrow a) can be generated in the prestressing steel 6. In this step, a new reinforcing bar (not shown) is welded to each other between the reinforcing bars 5 protruding to the cross section of the opposing bridge 2 as a matter of course.

[Procedure II]

As shown in (i) and (j) in Fig. 5, the jack 9 is provided at a plurality of places (preferably 4 sides) within a predetermined range 4 of the opposing surfaces at the ends of both bridges 2, as shown in Figs. By applying the compression action (arrow b) to the cross-section of the two sides of the range by the extrusion action of the jack (9), it is also possible to further increase the elastic tension to the prestressing steel (6) have.

[Procedure III]

As shown in (k) and (l) of FIG. 6, the part which becomes the hinge part 3 in a state in which the end of both bridges 2 is pressed and expanded by the jack 9 in the above procedure II. Then, the required framework is made to correspond to the shape of the ends of both bridges 2, and a fence (cover) is provided to surround the jack 9, and then the concrete 10 is poured within a predetermined range 4 And harden it.

[Procedure IV]

As shown in Figs. 7 (m) and 7 (n), the compression force (arrows) applied to the cross-sections of the bridges 2 on both sides by loosening and removing the jack 9 after the poured concrete 10 is cured b) and the elastic tension generated in the prestressing steel material 6 is released, and since the liberated compressive force and elastic tension are applied to the concrete 10 within a predetermined range 4 as a prestress, the above range is reinforced. After that, by filling the holes (filling) concrete 11, respectively, into the holes formed by removing the fence (cover) of the jack 9, the poured concrete 10 becomes the hinge part 3 .

In the above embodiment, when a steel pipe sheath is attached to the outside using a PC steel rod as the prestressing steel material 6, the grout is filled in the steel pipe sheath to rust-proof the PC steel rod. It is preferable to tension-fix the prestressed steel material, but the tension force is suppressed within the elastic range of the steel material, including the elastic tension increased in the prestressed steel material 6 by extrusion of the jack 9, and the sum thereof is suppressed. , 0.7 Py or less [Py: Yield strength of prestressed steel]. In other words, if the elastic tension increased by the extrusion of the jack 9 to the prestressing steel material is set to 0.2 Py, first, the tension fixing force of the prestressing steel 6 is 0.5 Py or less.

In addition, when the prestressing steel 6 is a PC steel bar and is arranged in an outer cable system, there is little slack in the PC steel bar, so it is possible to settle without tension. In the case of using a PC strand, it is preferable that the prestressing steel material 6 is deformed within the elastic range with a margin by applying a slight tension to the extent that it loses slack, for example, by tension fixing as a tension of 0.1 to 0.2 Py. Do.

In this way, the prestress is provided to the new concrete 10 poured in a predetermined range 4 including the hinge portion 3 to be formed, and the deteriorated or damaged hinge portion is reinforced in a state in which it is continuous with the existing bridge, In addition to suppressing the occurrence of initial cracks during construction, it is possible to prevent the occurrence of sagging in the closed portion (hinge portion) during construction, and also to suppress the occurrence of cracks in use. The jack 9 used may be any of a hydraulic jack, a screw jack, or a bolt jack, and is not particularly limited. In addition, it is preferable to use expanded concrete for the concrete 10 poured in the predetermined range 4. That is, in parallel with the prestress introduced by the jack 9, it acts more effectively against the initial crack prevention.

In addition, in the above embodiment, specific examples of connecting the reinforcing bars before pouring concrete are shown in FIGS. 8 and 9. As shown in the figure, the pre-installed reinforcing bar 5 is laid out from the girder end faces on both sides, and the new reinforcing bar 12 is, for example, enclosed welding within a predetermined range 4. ) In the axial direction, and further reinforcement (not shown) required, for example, stirrup. After that, the concrete 10 is poured, and after the concrete is cured, prestress is applied to the reinforced concrete, so that it becomes a stiffened reinforcement portion than the central closed portion of the conventional RC tank.

Next, the second embodiment shown in Fig. 10 will be described.

This 2nd Embodiment adds the structure which aims at the strength improvement of the reinforcement of the hinge part 3 in addition to the structural requirements concerning said 1st Embodiment.

That is, after pouring the new concrete 10 into the predetermined range 4 described in the first embodiment, and introducing the prestress to serialize the bridge 2, the inner side of the box girder in the longitudinal direction of the bridge 2 A steel frame steel 13 made of, for example, H-shaped steel, of a length required to reach the inside of the bridge 2 on both sides beyond the hinge portion 3 in the central portion, is installed, and the steel frame steel 13 ) Both ends of the end anchor plate 14 is integrally mounted (adhered) by welding or the like, and is formed integrally with the bridge 2 by pouring supplementary concrete 15 around the steel frame 13 installed. By doing so, a steel anchor part 16 is formed on the bridges 2 on both sides, so that the connection strength is remarkably improved. In this case, it is preferable to attach the stud bolt 17 to the flange of the H-shaped steel constituting the steel frame steel 13 to increase the adhesion with the supplementary concrete.

As steel frame 13 used in this case, considering the situation at the construction site, transportation, and workability (handling), the long steel (10 m or more) and the short steel ( 5m or less). In the illustrated embodiment, a single steel frame 13 is used, and the ends of the steel frame 13 are put out at predetermined lengths from the cross-sections of each bridge 2 on both sides, and the intermediate ends are put in the middle. The connecting steel frame 13a for connecting the parts is placed face-to-face, and is connected and integrated using bolts through a gusset plate 18. Thus, even long or short, the steel frame 13 is installed in communication with the inside of the bridge 2 on both sides, and the supplementary concrete 15 is poured around the steel frame 13 to form an integral part with the bridge 2 By doing so, the steel anchor portion 16 is formed.

Either way, it is fixed to the supplementary concrete 15 by the end anchor plate 14 provided at the end of the steel steel 13, and compared to the case of the steel steel 13 only, the anchor of the steel steel 13 Since the length of the portion 16 can be shortened, construction is simplified. In addition, although illustration is omitted, as shown in FIGS. 8 and 9, it is also used in combination to connect the reinforcing bars by reinforcing the cross-sections of the opposing molds 2.

In addition, after connecting the steel-steel material 13, the concrete 10 is poured and cured in the same manner as shown in Figs. 4 to 7 described above. By releasing and removing the jack after curing the concrete, the compressive force applied to the cross-section 2 of both sides of the above range and the elastic tension generated in the prestressed steel 6 are released, so that the released compressive force and elastic tension are within the range as prestress. Given to the concrete 10, the predetermined range 4 was reinforced. In this way, the predetermined range 4 has a more robust structure by arranging the steel-steel material 13 when pre-stress is introduced, and in particular, it is possible to reliably prevent the sagging of the central closure portion including the hinge portion 3.

The present invention is not limited to the configuration according to the above-described embodiment, and various changes can be made freely without departing from the spirit of the present invention.

For example, in order to increase the strength of the reinforcement of the hinge portion 3, the same effect can be achieved by changing the steel frame shown in the second embodiment to another reinforcing material, for example, a PC cable and reinforcing it by an outer cable method. Since can be obtained, it is assumed that various configurations are included in the spirit of the present invention as a reinforcing means for the hinge portion 3 to which the present invention is applied.

[Industrial availability]

The method for reinforcing the hinge portion and the reinforcing structure of the prestressed concrete girder bridge according to the present invention is a reinforcing method and reinforcing structure for the hinge portion 3 in the prestressed concrete girder bridge, in a predetermined range (4) for pouring concrete 10 After placing the prestressing steel material 6 to the required length in the throttle direction on both sides and tensioning to create elastic tension in the prestressing steel material, the jack 9 is installed at the required position within the above-mentioned predetermined range 4 , By applying the compression force to the cross-section of both sides of the range by the extrusion of the jack (9), and further increases the elastic tension to the pre-stressing steel, concrete in the above range in the state of extruding the jack (9) Compressed and cured by pouring and removing the jack 9 after curing the concrete to remove the compressive force and free from the cross-sections on both sides of the range. The elastic tension generated in the stressed steel material is released to impart to the concrete 10 within the predetermined range 4 as prestress, and the compression force by the jack and the elastic tension of the prestressed steel material 6 are changed to a predetermined prestress to reinforce the above. When possible, it can be applied to the concrete 10 within a predetermined range 4, and it is possible to reliably prevent sagging during use as well as during construction, and by arranging steel steel in a predetermined range including a hinge portion, Since the proof strength of the cross-section can be greatly improved, it can be used in a wide range in repair work of this type.

1: Pier
2: hanging
3: hinge
4: predetermined range
5: Reinforcing bar for connection
6: Prestressing steel
7: Settlement
8: Settlement
9: Jack
10: concrete
11: hole buried concrete
12: New splice bars
13: Steel steel
14: end anchor plate
15: supplementary concrete
16: Anchor part
17: stud bolt
18: Gusset plate

Claims (4)

As a method of reinforcing the hinge portion in a prestressed concrete girder bridge,
The prestressing steel is placed by placing prestressing tendons up to the required length in the bridge axial direction on both sides over a predetermined range that becomes the hinge portion before pouring concrete. After the elastic tension is generated in the jack, a jack is installed at a required location within the above-mentioned predetermined range, and bridge girders on both sides of the range are formed by extrusion of the jack. ) Applying a compressive force to the end face and further increasing the elastic tension to the prestressing steel material;
Pouring and curing the concrete in the above-described range in the state where the jack is extruded; And
Releasing the compressive force applied to the cross-sections on both sides of the range and the elastic tension generated in the pre-stressed steel by releasing and removing the jack after curing the concrete to impart to the concrete within the range as pre-stress;
A method of reinforcing the hinge portion of a prestressed concrete girder bridge, comprising: According to claim 1,
A method of reinforcing the hinge portion of a prestressed concrete girder bridge by arranging steel steel materials to a required length in the direction of the throttle on both sides over the above range and integrating it with the bridge by supplemental concrete. As a reinforcement structure of a hinge part in a prestressed concrete girder bridge,
After placing the pre-stressed steel to the required length in the throttle direction on both sides over a predetermined range that becomes the hinge portion before pouring the concrete, and tension-fixing to create elastic tension in the pre-stressed steel, a jack is installed at the required location within the above-mentioned predetermined range, Compression force is applied to the cross-sections on both sides of the range by the extrusion of the jack, and the prestressing steel material further has an elastic tension,
In the state in which the jack is extruded, concrete is poured into the above range to harden,
After the concrete is hardened, the compression force applied to the cross-sections on both sides of the range and the elastic tension generated in the pre-stressed steel material are released by releasing and removing the jack after the curing of the concrete, and the hinge portion of the prestressed concrete bridge is applied to the concrete within the range as prestress. Reinforcement structure. According to claim 3,
Over the above range, steel steel materials are arranged up to the required length in the direction of the throttle on both sides, and the hinge part reinforcement structure of the prestressed concrete bridge is integrated with the bridge with supplementary concrete.

Images