JP4562631B2 - Repair structure of hinge part in concrete structure - Google Patents

Description

The present invention relates to a repair structure for a hinge portion in a novel concrete structure that does not damage a girder, for example, using a steel bracket without replacing an existing support member.

Conventionally, as a first example of this type of reinforcing structure, there is a technique disclosed in Japanese Patent Laid-Open No. 9-235706 in FIG. This will be described. A non-shrink mortar (filler) 3 filled in a gap between the fixed 1 and the suspended 2 supported by the fixed 1, a fixing bracket 4 provided at the lower end of the suspended 2, and the fixing A reinforced PC steel bar (reinforcing material) 5 having a lower end fixed to the bracket 4 and an upper end fixed to the suspended 2, and fixed 1 so as to extend obliquely downward from the fixed 1 toward the fixing bracket 4. An inclined PC steel rod (an inclined suspension member) 6 having an upper end fixed in the vicinity of the end portion and a lower end fixed to the fixing bracket 4 is provided. The fixing bracket 4 is a concrete girder, has a rectangular cross section, and is formed on the entire width of the suspended two lower portions. The reinforced PC steel bars 5 extend vertically and are arranged in two rows at regular intervals in the bridge axis direction. A plurality of rows are arranged at predetermined intervals also in the direction perpendicular to the bridge axis. The upper end is fixed by a fixing tool. A fastener is fixed and embedded at the lower end. With such a reinforced PC steel rod 6, the fixing bracket 4 is fixed to the lower surface of the end of the suspended S. The obliquely suspended PC steel bar 6 extends obliquely downward from 1 fixed at an angle of about 30 ° to the horizontal surface to 2 suspended. The upper half is embedded in the fixed 1, a part of the lower half is exposed, and only the lower end is embedded in the bracket. The upper end is fixed by a fixing tool. A fastener is fixed and embedded at the lower end. The relative positions of the reinforcing PC steel bar 5 and the obliquely suspended PC steel bar 6 are alternated in the direction perpendicular to the bridge axis.

Next, as a second example of this type of hinge portion reinforcing structure, there is a technique disclosed in Japanese Patent Application Laid-Open No. 9-3825 shown in FIG. Explaining this, 7 is the first girder located at the end of the concrete Gerber bridge, 8 is the second girder that supports the right end of the first girder 7 with the hinge part 9 in between, and before construction, As shown in FIG. 10, a gap 10 is formed between the first girder end and the second girder end. An upper surface reinforcing portion 11 and a lower surface reinforcing portion 12 having an RC structure are formed on both the upper surface and the lower surface of the hinge portion 9 to continuously integrate the first girders 7 and the second girders 8 respectively. Further, the clearance 10 of the hinge portion 9 is filled and cured with an ultrafast hardening type polymer cement mortar injection material 13 having a strength equal to or higher than a predetermined value 3 hours after injection and having fluidity for a predetermined time. As a result, the gap 10 of the hinge portion 9 is closed, and the butted surfaces of the first girder 7 and the second girder 8 are integrated by the adhesive force of the super fast hard polymer cement mortar injection material 13. Furthermore, connecting members 14 are installed on the upper and lower two stages of the hinge portion 9. The connecting member 14 is formed by passing bolts 14a through through holes formed in the hinge portion 9 and screwing nuts 14c from both ends via plates 14b, thereby mechanically tightening the first and second girders 7 and 7 with each other. 8 is integrated. The upper surface reinforcing portion 11 is provided with an existing floor slab so that the surface after reinforcement is flush with the road surface, and reinforcing reinforcing bars are arranged so as to be continuous with the upper surfaces of the first and second girders 7 and 8. The upper surface reinforcing portion 11 is formed on the both girders 7 and 8 side. As the cement mortar to be poured, a polymer cement mortar 13 having excellent early strength, fluidity, and low expansibility and having a strength of a predetermined value or more in a predetermined time after placing is used. Further, the lower surface reinforcing portion 12 is formed over the entire area of the first digit 7 and the second digit 8. In this case as well, reinforcing reinforcing bars are arranged so as to be continuous with the lower surfaces of the first and second girders 7 and 8 so that the transmission of stress is not interrupted by the hinge portion 9, and the same cement mortar as the upper reinforcing portion 11 is used. is doing.
Japanese Patent Laid-Open No. 9-235706 Japanese Patent Laid-Open No. 9-3825

The conventional technique has the following problems because it has the configuration and operation as described in the background art.
That is, according to the technique disclosed in Japanese Patent Laid-Open No. 9-235706 as the first example and Japanese Patent Laid-Open No. 9-3825 as the second example, the gel bar which is a static structure is disclosed. Since the structural system changes from a girder to a static girder that is an indefinite structure, the reinforcement against the bending moment and the natural frequency will change, affecting the substructure. There is a problem that a check is necessary, and the balance bracket at the bottom of the girder is hung with a PC steel rod, so many holes are drilled from the floor slab, so there is a high possibility of damaging the PC steel wire of the girder. was there.

Furthermore, in general, this type of technology is such that, at all times, the support member of the hinge part structure in which the dead load does not act is connected to the center of the span by a gelenque support member, for example, in a bridge in which a PC box girder is constructed by the Divide Dark method. ing. The support member has a steel meshing structure, but the left and right girders are lowered due to concrete creep due to long span installation, relaxation of PC steel wires connecting each girder block, fatigue due to live loads, etc. There is a problem that the meshing portion is rubbed due to deformation in the direction, or the support member itself is damaged, so that its function is incomplete.
The problem to be solved by the present invention is to solve the problems described in the background art.

The repair structure of the hinge part in the concrete structure according to the present invention damages the existing girder PC steel wire without changing the structure or the like, shortening the construction time and performing long-term traffic regulation. The purpose is not to form a step due to deformation of the girders of the hinge part and to prevent damage to the girders while eliminating the need to replace the existing support parts. Consists of configuration and means.

That is, according to the first aspect of the present invention, in the hinge portion of the concrete structure, the substantially L-shaped steel made of one and the other fixed with anchor bolts on both the left and right sides of the girders in the vicinity of the hinge portion. A bracket, a single or a plurality of rubber support members interposed between one and other connecting portions of the substantially L-shaped steel bracket, and a single or a plurality of connecting the one and the other of the substantially L-shaped steel bracket It has a plurality of PC steel bars.

According to the second aspect of the present invention, in the hinge portion of the concrete structure, the substantially L-shaped steel bracket comprising one and the other fixed with anchor bolts on both the left and right sides of the girders in the vicinity of the hinge portion; A first rubber bearing member interposed in a gap between one and the other connecting portion of the substantially L-shaped steel bracket, and one of the substantially L-shaped steel brackets connected to one and the other connecting portions and the one And a PC steel rod on which a second rubber support member is disposed and crimped on the upper wall portion of the connecting portion of the substantially L-shaped steel bracket.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the one and the other substantially L-shaped steel brackets are partially made of H-shaped steel, and a plurality of flanges as wall surfaces And a hand hole is drilled at a desired position on the web.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the substantially L-shaped steel bracket comprising the one and the other can be mounted on the site.

Since the repair structure of the hinge portion in the concrete structure according to the present invention has the above-described configuration, the following effects are obtained.

That is, according to the first to fourth aspects of the invention, there is an effect that the construction system is not changed and long-term traffic regulation is not required for the construction. Moreover, there is an effect that the possibility of damaging the existing girder PC steel wire is low and a step due to the girder deformation of the hinge portion can be prevented. Further, since the noise for installing the rubber bearing member in the upper and lower gaps of the hinge portion is not generated and the existing bearing member is not replaced, the construction time can be shortened without damaging the girders.

Embodiments of a repair structure for a hinge portion in a concrete structure according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a front view in the vicinity of a hinge part B of a concrete structure, for example, a bridge. FIG. 2 is a view as seen from the direction of arrow A in FIG. 1 and shows the structure of one and the other of substantially L-shaped steel brackets fixed to both the left and right sides of the girders in the vicinity of the hinge portion B of the bridge. It is a front view which shows an example. The embodiment of the present invention will be clarified based on FIG. 1 and FIG. 2 described above.

Reference numeral 1 denotes a floor slab in a bridge which is an example of a concrete structure. Reference numeral 2 denotes a girder that is continuous with the floor slab 1 and stands on the left and right sides of the bridge. In front of and behind the girders 2 and 2, there is provided a gelling support member 3 which is connected between the front and rear girders 2 and 2 that exist in the past, that is, the hinge part B. For example, a concave part is formed on the side wall of one girder and a convex part is formed on the side wall of the other girder. Yes. However, the Gereng support member 3 is deformed or deformed due to the use of many years, etc., the horizontal surface of the floor slab 1 becomes stepped, and cracks and steps are generated in the pavement member 4 formed on the upper surface of the bridge floor slab 1, Although it is necessary to repair this, in the present invention, the problem is solved by performing additional repair work without removing the gereng support member 3.

2a is a right side wall of the beam 2 and 2b is a left side wall of the beam 2. As shown in FIG. 2, the left and right sides of the girder 2, that is, the right side wall 2a of the girder 2 and the left side wall 2b of the girder 2 are respectively provided with one and the other substantially L-shaped steel brackets 5A and 5B. Are arranged.

One substantially L-shaped steel bracket 5A is composed of a main body portion 5A1 and a connecting portion 5A2, and the other substantially L-shaped steel bracket 5B is composed of a main body portion 5B1 and a connecting portion 5B2. The first rubber is provided in the gap S1 between the base plate 5c, 5d in the connecting portion 5A2 of the one substantially L-shaped steel bracket 5A and the connecting portion 5B2 of the other substantially L-shaped steel bracket 5B. A support member 6 is interposed. Further, the upper wall portion 9a (wall surface portion) of the connecting portion 5A2 of the one substantially L-shaped steel bracket 5A has a gap S2 between the base plate 5a and another base plate 5b via the base plate 5a. The second rubber support member 7 is arranged and pressure-bonded by two rows, for example, four PC steel bars 8, 8,.
The PC steel bars 8, 8... Are, for example, 10 (KN) per one in order to improve the familiarity between the first and second rubber bearing members 6, 7 and the substantially L-shaped steel brackets 5A, 5B. Giving tension.

In the one substantially L-shaped steel bracket 5A, a plurality of wall surface portions 9a which are partially made of H-shaped steel and are erected are composed of flanges of the H-shaped steel, and are defined by the plurality of wall surface portions 9a. The flat portion 9b, that is, the H-shaped steel web. The web (planar portion) 9b is formed with a hand hole 9c necessary for driving or assembling an anchor by an operator at a desired position. Further, a plurality of or many desired anchor bolts 11 or anchors using a resin are driven into the flat portion 9b of the one substantially L-shaped steel bracket 5A, and the one substantially L-shaped steel as shown in FIG. A bracket 5A is fixed to the right side wall 2a and the left side wall 2b of the beam 2.

The other substantially L-shaped steel bracket 5B has substantially the same structure as the one substantially L-shaped steel bracket 5A described above, and is connected to each other to form a substantially L-shaped steel as a set. The entire bracket 5 is constructed. In the other substantially L-shaped steel bracket 5B, a plurality of wall surface portions 10a which are partially made of H-shaped steel and are erected are composed of flanges of the H-shaped steel, and are defined by the plurality of wall surface portions 10a. A hand hole 10c required for anchor driving and assembly work by an operator is drilled in the desired plane portion 10b. Also, a desired number of anchor bolts 11 or a plurality of anchors using resin are driven into the flat portion 10b of the other substantially L-shaped steel bracket 5B, and the other substantially L-shaped steel as shown in FIG. The bracket 5B is fixed to the right side wall 2a and the left side wall 2b of the beam 2.

Next, the configuration in which the connecting portions 5A2 and 5B2 of the other substantially L-shaped steel brackets 5A and 5B are connected to each other will be described in detail.
The connecting portion 5B2 of the other substantially L-shaped steel bracket includes upper and lower wall surface portions 10a and 10a, a base plate 5c is provided on the upper wall surface portion 10a, and the one approximately L-shaped steel bracket 5A is provided. The connecting portion 5A2 includes upper and lower wall surface portions 9a, 9a, and a base plate 5d is fixed to the lower wall surface portion 9a, and the first rubber support member 6 is interposed in the gap S1 between the base plates 5c, 5d. Disguise.

A second rubber is provided in the gap S2 between the base plate 5a and the different base plate 5b via the base plate 5a on the upper wall portion 9a (wall surface portion) of the connecting portion 5A2 of the one substantially L-shaped steel bracket 5A. The support members 7 are arranged and crimped by four PC steel bars 8 and 8 in two rows in the front and rear.

Reference numeral 13 denotes a square washer, which is mounted on the outer surface of the lower wall surface portion 10a and the outer surface of the different base plate 5b in the connecting portion 5B2 of the other substantially L-shaped steel bracket 5B. Are fastened to both ends of the PC steel bars 8, 8... To completely connect the connecting portions 5A2, 5B2 of the one and the other substantially L-shaped steel brackets 5A, 5B. At that time, the first rubber support member 6 and the second rubber support member 7 are pressed or pressed and held between the base plates 5c and 5d and between the base plates 5a and 5b, respectively.

Next, based on the embodiment of the repair structure of the hinge part B in the concrete structure according to the present invention, its operation, action, assembly procedure, etc. will be described.

Here, FIG. 3 shows an overall configuration diagram of a concrete structure, for example, a bridge, where (a) is a side view and (b) is a plan view seen from above (a).
B is a hinge part B of the concrete structure existing between the left and right girders 2 and 2, and there are a predetermined number in the length direction of the concrete structure, that is, the bridge. The hinge portion B in the concrete structure such as a bridge, that is, the one and the other substantially L-shaped steel brackets 5A and 5B are in the directions of arrows P1 and P2 in FIG. 2, that is, arrows P1 and P2 in FIG. If a load is applied as shown in the direction, the second rubber bearing member 7 receives a live load reaction force through the PC steel bars 8 and 8 while being compressed. When the load acts as shown by the arrows P3 and P4 in FIG. 2, that is, as indicated by the arrows P3 and P4 in FIG. 4B, the first rubber support member 6 is moved through the PC steel bars 8, 8. Receives live reaction force while compressing.
As shown in FIG. 5, the dead load is in a neutral state due to the rigidity of the girders 2 and 2, and the first and second rubber bearing members 6 and 7 are loaded on the existing structural bearings. There is no reaction force.

Then, for example, one and the other substantially L-shaped steel brackets 5A and 5B are manufactured in advance at a factory. By the way, the one and the other substantially L-shaped steel brackets 5A and 5B may be separated and divided, or may be integrated with the attachment plate 12 at the time of attachment.

Next, a bore hole for driving an anchor bolt 11 such as a concrete anchor or a resin anchor is drilled in a predetermined position of the existing beam 2. Then, anchor bolts 11 such as concrete anchors are fixed with an epoxy resin adhesive or the like. Next, the one and the other substantially L-shaped steel brackets 5 </ b> A and 5 </ b> B are attached to the existing girder 2. At this time, the operator tightens the anchor bolt 11 by inserting a hand into the hand holes 9c and 10c.
The first and second rubber bearing members 6 and 7 are disposed at predetermined positions between the base plates 5c and 5d and between the base plates 5a and 5b, and are fixed by an adhesive or the like. Then, the one and the other substantially L-shaped steel brackets 5A, 5B are perforated, and, for example, the four PC steel bars 8, 8,. A predetermined prestress is introduced into the four PC steel bars 8, 8... Using, for example, a center hole jack.

According to the embodiment of the repair structure of the hinge part B in the concrete structure according to the present invention described above, in the structure in which the conventional gerenk support member 3 remains, one and the other of the present invention First and second rubber bearing members are added, because there are no long-term traffic restrictions because of the additional construction of the substantially L-shaped steel brackets 5A and 5B, and it is possible to completely prevent the step due to the girder deformation of the hinge part B of the concrete structure. There are various advantages that no noise or the like for installing 6 and 7 is generated.

Next, an embodiment of the repair structure of the hinge part B in the concrete structure according to the present invention will be described in detail with reference to FIGS.

FIG. 6 is a front view showing an embodiment of one and the other of the substantially L-shaped steel brackets fixed to the left and right sides of the girders in the vicinity of the hinge portion B of the concrete structure, for example, the bridge. FIG. 7 is a front view showing a detailed portion of FIG. 8 is a partial view of FIG. 7, where (a) is a cross-sectional view seen from the direction of the arrow CC in FIG. 7, and (b) is seen from the direction of the arrow DD in FIG. 7. It is sectional drawing.

This embodiment basically has a configuration in which the second rubber support member 7 is omitted from the configuration of the embodiment shown in FIG. 2 described above. Reference numeral 12 denotes an attachment plate, and as shown in FIG. 7, a wall surface portion 9a on the upper side of the one substantially L-shaped steel bracket 5A and the other substantially L-shaped steel bracket 5B by a high-pressure bolt (HTB) 14. And the lower wall surface portion 10a abuts on the outer surface and is fixed.
Other constituent members are substantially the same as those in the above-described embodiment, and are assigned the same reference numerals and explanations thereof are omitted.

Next, based on the Example of the repair structure of the hinge part B in the concrete structure based on this invention, the operation | movement, an effect | action, etc. are demonstrated.

Here, FIG. 3 shows an overall configuration diagram of a concrete structure, for example, a bridge, where (a) is a side view and (b) is a plan view seen from above (a).
B is a hinge part B of the concrete structure existing between the left and right girders 2 and 2, and there are a predetermined number in the length direction of the concrete structure, that is, the bridge. The hinge portion B in the concrete structure such as a bridge, that is, the one and the other substantially L-shaped steel brackets 5A and 5B are in the directions of arrows P1 and P2 in FIG. 6, that is, arrows P1 and P2 in FIG. When a load is applied as shown in the direction, the first rubber support member 6 is subjected to a live load reaction force through the PC steel rods 8, 8. That is, if the load acts as indicated by arrows P3 and P4 in FIG. 6 as shown by arrows P3 and P4 in FIG. 4B, that is, as indicated by arrows P3 and P4 in FIG. The first rubber bearing member 6 receives a live load reaction force while being compressed through 8, 8.
As shown in FIG. 5, the dead load is in a neutral state due to the rigidity of the girders 2 and 2, and the first and second rubber bearing members 6 and 7 are loaded on the existing structural bearings. There is no reaction force.
Further, the assembly procedure is substantially the same as the configuration in the above-described embodiment, and the description thereof is omitted.

It is a front view in the vicinity of the hinge part B of the concrete structure which concerns on this invention, for example, a bridge. FIG. 2 is a view as viewed from the direction of arrow A in FIG. 1, showing a structural example of one and the other of substantially L-shaped steel brackets fixed to both left and right sides of the bridge in the vicinity of the hinge portion B of the bridge. FIG. Based on the embodiment of the repair structure of the hinge part B in the concrete structure according to the present invention, its operation, action, assembly procedure, etc. will be described. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the load effect | action in the concrete structure which concerns on this invention, Comprising: (a) is a schematic diagram when it is the load direction of arrow P1, P2, (b) is the load direction of arrow P3, P4. It is a schematic diagram at a certain time. FIG. 2 is a schematic diagram showing a load action in a concrete structure according to the present invention and showing a neutral state by the rigidity of left and right girders. It is a front view which shows the concrete structure which concerns on this invention, for example, the substantially L-shaped steel bracket which fixes to the left and right both sides of the girder in the vicinity of the hinge part B of a bridge, and the other Example. It is a front view which shows the detailed part of FIG. 8 is a partial view of FIG. 7, where (a) is a cross-sectional view seen from the direction of the arrow CC in FIG. 7, and (b) is a cross-sectional view seen from the direction of the arrow DD in FIG. 7. . It is explanatory drawing which shows the 1st example of the reinforcement structure in a prior art. The 2nd example of the reinforcement structure of the hinge part in a prior art is shown, Comprising: It is a principal part enlarged view.

DESCRIPTION OF SYMBOLS 1 Floor slab 2 Girder 2a Girder right side wall 2b Girder left side wall 3 Guerlenk support member 4 Pavement member 5 L-shaped steel bracket 5A One L-shaped steel bracket 5A1 Main body of one L-shaped steel bracket 5A2 One substantially L-shaped steel bracket connecting portion 5B The other substantially L-shaped steel bracket 5B1 The other substantially L-shaped steel bracket body portion 5B2 The other substantially L-shaped steel bracket connecting portion 5a Base plate 5b Base Plate 5c Base plate 5d Base plate 6 First rubber bearing member 7 Second rubber bearing member 8 PC steel rod 9a Wall surface (flange)
9b Flat part (web)
9c Handle hole 10a Wall part (flange)
10b Flat part (web)
10c Handle hole 11 Anchor bolt (anchor using resin)
12 Connecting plate 13 Square washer 14 High-pressure bolt (HTB)
B Hinge part S1 Gap between base plate 5c and base plate 5d S2 Gap between base plate 5a and base plate 5b

Claims (4)

In the hinge portion of a concrete structure, one of the substantially L-shaped steel bracket and one of the substantially L-shaped steel brackets, which is fixed to the left and right sides of the girders in the vicinity of the hinge portion with anchor bolts. And a single or a plurality of rubber bearing members interposed in the other connecting portion, and a single or a plurality of PC steel rods connecting one and the other of the substantially L-shaped steel brackets. The repair structure of the hinge part in the featured concrete structure. In the hinge portion of a concrete structure, one of the substantially L-shaped steel bracket and one of the substantially L-shaped steel brackets, which is fixed to the left and right sides of the girders in the vicinity of the hinge portion with anchor bolts. And a first rubber support member interposed in a gap between the other connecting portion, one of the substantially L-shaped steel brackets and one of the other connecting portions, and the connection of the one substantially L-shaped steel bracket. A repair structure for a hinge portion in a concrete structure, comprising a PC steel bar on which a second rubber support member is disposed and crimped on an upper wall portion of the portion. The substantially L-shaped steel bracket comprising the one and the other is partially made of H-shaped steel and defined by a plurality of flanges as wall surfaces, and a hand hole is drilled at a desired position of the web. Repair structure of hinge part in concrete structure of 1 or 2 . The repair structure for a hinge part in a concrete structure according to claim 1 or 2, wherein the substantially L-shaped steel bracket made of one and the other is attachable to the field.

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