JP7077010B2 - Reinforced structure of reinforced concrete structure and reinforcement method of reinforced concrete structure - Google Patents

Description

The present invention relates to a reinforcing structure of a reinforced concrete structure and a method of reinforcing a reinforced concrete structure .

Conventionally, in reinforced concrete structures such as bridges, repairs are made when the cross section of concrete is damaged or peeled off due to deterioration or impact, and when parts containing deterioration factors such as neutralization, frost damage, salt damage, etc. are removed. The cross-section repair method, which is the intended repair method, is known. According to the conventional cross-section repair method, when the cast cross-section repair material is hardened, the hardened cross-section repair material secures the integrity between the concrete and the reinforcing bar and suppresses the decrease in the yield strength of the reinforced concrete structure. It is said that it can be done.

However, the reinforced concrete structure in service bends, deforms, vibrates, etc. on the concrete due to the weight of the structure itself, the passage of vehicles, and the like. When the conventional cross-section repair method is applied to such a reinforced concrete structure in service, the stress acting on the concrete cannot be sufficiently transmitted to the reinforcing bar until the cast cross-section repair material hardens. The unity between concrete and reinforcing bars has disappeared. That is, even if the concrete is bent and deformed, the reinforcing bars cannot move together according to the behavior of the concrete. For this reason, if the concrete is bent and deformed before the cross-section repair material is hardened, there is a risk that a gap may be created between the cross-section repair material and the concrete or between the cross-section repair material and the reinforcing bar. There is a risk that the cross-section repair material will harden with a gap between the cross-section repair material and concrete or between the cross-section repair material and the reinforcing bar. As a result, the cross-section repair material is hardened without ensuring the integrity of the concrete and the reinforcing bar, and even if the cross-section repair material is hardened, the stress acting on the concrete is sufficiently applied to the reinforcing bar through the cross-section repair material. There was a problem that the concrete could not be borne by the concrete, cracks and the like occurred, and the reinforcement of the reinforced concrete structure was not sufficient.

Further, the existing bridge girder disclosed in Patent Document 1 is reinforced for the purpose of reducing the stress due to dead load and obtaining sufficient yield strength against the stress due to live load without adversely affecting the existing bridge girder due to drilling or the like. A method has been proposed. The method for reinforcing an existing bridge girder disclosed in Patent Document 1 is to reinforce an existing bridge girder by attaching a sheet-shaped tensile reinforcing material to the lower surface of the existing bridge girder whose both ends are supported by a bridge girder support structure such as a pier. In the method, the central part of the bridge girder is lifted upward by a jack to relieve the tensile stress of the existing reinforcing bar in the bridge girder, and this state is maintained, a tensile reinforcement is attached to the lower surface of the existing bridge girder, and then the lifting by the jack is released. ..

However, the method for reinforcing the existing pier disclosed in Patent Document 1 has a problem that the construction cannot be performed in a short time because the existing pier needs to be lifted upward by a jack and the construction becomes large.

Japanese Unexamined Patent Publication No. 2006-194025

Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose thereof is to make it possible to carry out the construction in a short time and to bear the stress acting on the concrete. It is an object of the present invention to provide a reinforcing structure of a reinforced concrete structure and a method of reinforcing a reinforced concrete structure, which can secure integrity and reinforce the reinforced concrete structure.

The reinforcing structure of the reinforced concrete structure according to the first invention is a reinforcing structure of the reinforced concrete structure for reinforcing the reinforced concrete structure, and the steel material having both ends fixed to the reinforced concrete structure and the reinforcement attached to the steel material. The steel material is provided with a tool, and the steel material is arranged so as to have a central portion separated from a chipping surface formed by chipping the concrete structure, and the reinforcing tool is a rod-shaped first member and the first member. It has a second member that is length-adjustably connected to the member, the first member is in contact with the chipping surface, and the second member is arranged between the chipping surface and the steel material. It is characterized in that it is brought into contact with the steel material.

The reinforcing structure of the reinforced concrete structure according to the second invention is characterized in that, in the first invention, the reinforcing tool is embedded in a time-curable material filled in a portion where the reinforced concrete structure is chipped .

The reinforcing structure of the reinforced concrete structure according to the third aspect of the invention is characterized in that, in the first invention, the reinforcing tool is exposed from the reinforced concrete structure and the chipped surface is exposed.

The method for reinforcing a reinforced concrete structure according to a fourth invention is a method for reinforcing a reinforced concrete structure for reinforcing the reinforced concrete structure, in which both ends are fixed to the reinforced concrete structure by scraping the concrete of the reinforced concrete structure. A reinforcing tool including a rod-shaped first member and a second member connected to the first member so as to be adjustable in length was exposed by the chipping step. In the mounting step, the second member is brought into contact with the steel material from the concrete surface side of the reinforced concrete structure, and the first member is connected to the second member. The first member is brought into contact with the concrete surface.

The method for reinforcing a reinforced concrete structure according to a fifth aspect of the present invention is characterized in that, in the fourth invention, the lower surface side of the concrete is scraped in the scraping step.

The method for reinforcing a reinforced concrete structure according to a sixth aspect of the present invention further comprises, in the fourth or fifth invention, a post-step of filling the portion of the concrete that has been chipped with a time-curable material after the mounting step. It is a feature.

The method for reinforcing a reinforced concrete structure according to the seventh aspect of the present invention further includes, in the fourth or fifth invention, a post-step in which the first member and the second member are left in an exposed state after the mounting step. It is characterized by being prepared.

The method for reinforcing a reinforced concrete structure according to an eighth aspect of the present invention is that in the seventh invention, in the mounting step, the reinforcing tool in which the first member and the second member are made of metal is attached to the reinforced concrete structure. The post-process is characterized in that a rust preventive agent is applied to the first member and the second member.

The method for reinforcing a reinforced concrete structure according to a ninth aspect of the present invention is to attach the reinforcing tool in which the first member and the second member are made of resin to the reinforced concrete structure in the mounting step in the seventh invention. It is characterized by.

According to the first to third inventions, a rod-shaped first member for contacting the concrete surface of the reinforced concrete structure is connected to the first member with adjustable length, and both ends are fixed to the reinforced concrete structure. It is provided with a second member for bringing the steel material into contact with the concrete surface side. Thereby, according to the first to third inventions, when a stress acts on the concrete, the stress can be transmitted from the concrete surface to the steel material via the first member and the second member. That is, according to the first to third inventions, even when the concrete is deformed, the steel material can be deformed so as to follow the behavior of the concrete, and the integrity between the concrete and the steel material is ensured. It will be. As a result, it is possible to suppress the occurrence of cracks in the concrete, and it is possible to reinforce the reinforced concrete structure by ensuring the integrity with the steel material that bears the stress acting on the concrete.

In particular, according to the first to third inventions, the reinforced concrete structure is reinforced immediately after being attached to the reinforced concrete structure without the period until the cross-section repair material is hardened unlike the conventional cross-section repair method. It is possible to exert the effect. As a result, even a reinforced concrete structure in service can be effectively reinforced.

Further, according to the first to third inventions, the tip of the first member can be attached to the reinforced concrete structure only by abutting the tip end portion on the concrete surface and abutting the second member on the steel material from the concrete surface side. , Construction can be done in a short time.

According to the fourth to ninth inventions, when stress acts on concrete, the stress can be transmitted from the concrete surface to the steel material via the first member and the second member. That is, according to the fourth to ninth inventions, the integrity of the concrete and the steel material is ensured. As a result, it is possible to suppress the occurrence of cracks in the concrete, and it is possible to reinforce the reinforced concrete structure by ensuring the integrity with the steel material that bears the stress acting on the concrete.

According to the fourth to ninth inventions, the stress acting on the concrete immediately after the reinforcing tool is attached to the reinforced concrete structure without the period until the cross-section repair material is hardened unlike the conventional cross-section repair method. Can be burdened on the reinforcing bars, so that the construction can be done in a short time.

According to the fifth to ninth inventions, the chipping step of scraping the lower surface side of the concrete is provided. Thereby, according to the fifth to ninth inventions, the first member can be connected to the second member in a state where the second member is placed on the upper side of the steel material in the mounting process. Therefore, according to the fifth to ninth inventions, the construction can be performed in a shorter time.

According to the sixth invention, after the mounting step, a post-step of filling the scraped portion formed in the chipping step with a time-curable material such as mortar is provided. Thereby, by curing the time-curable material, the stress acting on the concrete can be applied to the steel material through the first member, the second member and the cured time-curable material. In particular, according to the sixth invention, even if the concrete is deformed or the like, the steel material can be deformed so as to follow the behavior of the concrete, and the concrete and the time-curing material and the steel material and the time-curing property can be deformed. It is possible to prevent a gap from being formed between the material and the material. Therefore, according to the sixth invention, it is possible to firmly secure the adhesion between the concrete and the time-curable material and the adhesion between the steel material and the time-curable material. As a result, according to the sixth invention, it is possible to further secure the integrity with the steel material that bears the stress acting on the concrete, and it is possible to more effectively reinforce the reinforced concrete structure.

Further, according to the sixth invention, since the first member, the second member, and the steel material are covered with the time-curable material, it is possible to suppress deterioration such as corrosion thereof.

According to the seventh to ninth inventions, the post-process is provided in which the first member and the second member are left in an exposed state. As a result, according to the 7th to 9th inventions, it is possible to omit the formwork work for assembling the formwork for placing the cross-section repair material and the casting work for placing the cross-section repair material as in the conventional case. It can be done and the construction can be done in a short time.

Further, according to the seventh to ninth inventions, if the left first member or the second member is deteriorated by corrosion or the like, it can be immediately visually confirmed. According to the seventh to ninth inventions, since the reinforcing tool can be easily attached to the concrete surface and the steel material, the work of replacing the deteriorated first member or the second member with a new one can be easily performed. Is possible.

According to the eighth invention, the post-process of applying the rust preventive agent to the first member and the second member made of metal is provided. Thereby, according to the eighth invention, even if the first member and the second member are left in an exposed state, it is possible to suppress their corrosion. Therefore, according to the eighth invention, the reinforcing tool can be used for a long period of time, and the reinforced concrete structure can be reinforced at a lower cost.

According to the ninth invention, the mounting process of attaching a reinforcing tool in which the first member and the second member are made of resin to the concrete surface and the steel material, and leaving the first member and the second member exposed. The post-process is provided. As a result, according to the ninth invention, even if the first member and the second member made of resin are left in an exposed state, the first member and the second member do not corrode. Therefore, the reinforcing tool can be used for a long period of time, and the reinforced concrete structure can be reinforced at a lower cost.

It is a side view which shows the reinforced concrete structure in which the reinforcing tool to which this invention is applied is used. (A) is a front view which shows the reinforcing tool to which this invention was applied, and (b) is a front view which shows the modification. (A) is a front view showing a state in which a reinforcing tool to which the present invention is applied is attached to a chipping surface and a reinforcing bar, and (b) is a side view of (a). It is a figure which shows the chipping process of the reinforcement method of the reinforced concrete structure to which this invention is applied. It is a figure which shows the mounting process of the reinforcement method of the reinforced concrete structure to which this invention is applied, (a) is a figure which abuts the recessed portion of the 2nd member with a reinforced concrete structure from the chipping surface side, (b) is a figure. , It is a figure which abuts the tip part of the 1st member with a chipping surface. It is a figure which fills the chipping part with the time-curable material in the post-process of the reinforcement method of the reinforced concrete structure to which this invention is applied. It is a side view which shows the 1st modification of the reinforced concrete structure in which the reinforcing tool to which this invention is applied is used. (A) is a front view showing a state in which a reinforcing tool to which the present invention is applied is attached to the lower surface of concrete and a tension material, and (b) is a side view of (a). It is a side view which shows the 2nd modification of the reinforced concrete structure in which the reinforcing tool to which this invention is applied is used.

Hereinafter, a mode for carrying out the reinforcing tool to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a side view showing a reinforced concrete structure 6 in which the reinforcing tool 1 to which the present invention is applied is used.

The reinforced concrete structure 6 is a reinforced concrete structure to be reinforced, and is, for example, a bridge girder or a floor slab used for a bridge or the like. In the reinforced concrete structure 6, the reinforcing bar 80 as the steel material 8 is arranged inside the concrete 60. As the reinforcing bar 80, for example, steel bars for reinforced concrete specified in the Japanese Industrial Standards (JIS G 3112) are used. In the form shown in FIG. 1, the reinforcing bar 80 is the main reinforcing bar of the concrete 60 whose longitudinal direction extends in the horizontal direction, but the reinforcing bar 80 is not limited to this and may be a stirrups.

The reinforced concrete structure 6 has a chipped portion 61 formed by chipping the lower surface 71 side of the concrete 60. In the reinforced concrete structure 6, the reinforcing bar 80 is exposed at the chipping portion 61, and both end portions 80a of the reinforcing bar 80 are buried and fixed in the concrete 60, respectively. Further, in the reinforced concrete structure 6, a chipping surface 72 as a concrete surface 7 facing the reinforcing bar 80 is formed at a position deeper than the reinforcing bar 80 in the chipping portion 61. Therefore, the reinforcing bars 80 are arranged at a predetermined distance from the chipping surface 72. Since the chipping surface 72 is formed by chipping, it is non-landing.

In the reinforced concrete structure 6, a plurality of reinforcing tools 1 to which the present invention is applied are attached to the chipping surface 72 and the reinforcing bar 80 at predetermined intervals in the longitudinal direction of the reinforcing bar 80. The reinforcing tool 1 to which the present invention is applied is used to reinforce the reinforced concrete structure 6, and is connected to a rod-shaped first member 2 for abutting on the concrete surface 7 and the first member 2. A second member 3 for abutting the steel material 8 from the concrete surface 7 side is provided. The concrete surface 7 is a surface of concrete to which the tip portion 2a of the first member 2 is abutted, and the steel material 8 is a steel material to which the second member 3 is abutted.

FIG. 2A is a front view showing a reinforcing tool 1 to which the present invention is applied, and FIG. 2B is a front view showing a modified example thereof.

The first member 2 has a rod-shaped stretched portion 2c extending from the concrete surface 7 toward the steel material 8, and the tip portion 2a and the base end portion 2b of the first member 2 are wider than the stretched portion 2c of the first member. Be diametered.

For the first member 2, for example, a bolt 21 and a washer 22 are used. At this time, the head portion 211 of the bolt 21 becomes the base end portion 2b of the first member 2, and the shaft portion 212 of the bolt 21 becomes the extension portion 2c of the first member 2. Further, by attaching the washer 22 to the tip portion 21a of the bolt 21, the tip portion 2a of the first member 2 is larger in diameter than the extension portion 2c of the first member. The inner surface of the hole of the washer 22 may be threaded, and the shaft portion 212 of the bolt 21 may be screwed onto the inner surface of the threaded hole of the washer 22 to be attached to the tip portion 21a of the bolt 21. As long as the tip portion 2a of the first member 2 has a larger diameter than the stretched portion 2c, not only the washer 22 but also any nut, plate material, or the like may be used.

The first member 2 is made of a metal whose corrosion potential is noble than that of the steel material 8, and is made of, for example, a titanium alloy, a platinum alloy, or the like. The first member 2 is made of a metal whose corrosion potential is lower than that of the steel material 8, and may be made of, for example, a zinc alloy, an aluminum alloy, or the like. Further, the same kind of metal as the steel material 8 may be used for the first member 2. When the first member 2 is made of metal, a rust preventive agent may be applied. Further, the first member 2 may be made of a resin.

For the second member 3, for example, a plate material is used. The second member 3 is erected on the two first members 2 and is connected to the first member 2 so as to be able to transmit stress. Two through holes 31 are formed in the second member 3, and the first member 2 is inserted through the through holes 31. The second member 3 is formed by threading the inner surface of the through hole 31, and is connected to the first member with adjustable length by screwing the shaft portion 212 of the bolt 21 into the threaded through hole 31. .. The second member 3 is hooked to the base end portion 2b of the first member 2. The second member 3 is detachably attached to the first member 2, but the present invention is not limited to this, and the second member 3 may be integrated and connected to the first member 2.

The second member 3 has a recessed portion 32 recessed toward the tip end portion 2a side of the first member 2. Through holes 31 are formed on both sides of the second member 3 with the recessed portion 32 interposed therebetween. The recessed portion 32 is formed in a gently curved shape such as an arc shape. As shown in FIG. 3B, the recessed portion 32 may be formed by being bent at a predetermined angle.

The second member 3 is made of a metal whose corrosion potential is noble than that of the steel material 8, and is made of, for example, a titanium alloy, a platinum alloy, or the like. The second member 3 is made of a metal whose corrosion potential is lower than that of the steel material 8, and may be made of, for example, a zinc alloy, an aluminum alloy, or the like. Further, the same kind of metal as the steel material 8 may be used for the second member 3. When the second member 3 is made of metal, a rust preventive agent may be applied. Further, the second member 3 may be made of a resin.

FIG. 3A is a front view showing a state in which the reinforcing tool 1 to which the present invention is applied is attached to the chipping surface 72 and the reinforcing bar 80, and FIG. 3B is a side view of FIG. 3A. Is. In the reinforcing tool 1 to which the present invention is applied, as shown in FIG. 3, the tip portion 2a of the first member 2 is in contact with the chipping surface 72 as the concrete surface 7, and the chipping surface is brought into contact with the reinforcing bar 80 as the steel material 8. The second member 3 is abutted from the 72 side. Further, in the reinforcing tool 1 to which the present invention is applied, the first member 2 is arranged on both sides of the steel material 8 and the reinforcing bar 80 is fitted in the recessed portion 32 of the second member 3. The recessed portion 32 is recessed toward the concrete surface 7 side.

When the reinforced concrete structure 6 is in service, stress acts on the concrete 60 due to its own weight, vibration due to running of a vehicle, bending deformation, and the like.

In the conventional cross-section repair method, the unity between the concrete and the reinforcing bar is lost in the part where the concrete is squeezed until the cross-section repair material is hardened, and when stress due to running of the vehicle acts on the concrete. The stress could not be sufficiently applied to the reinforcing bar through the cross-section repair material. For this reason, in the conventional cross-section repair method, the reinforcement of the reinforced concrete structure is not sufficient until the cross-section repair material is hardened, especially immediately after the cross-section repair material is placed, and cracks or the like occur in the concrete. There was a risk. Further, in the conventional cross-section repair method, the period until the cross-section repair material is hardened is long, and the construction cannot be performed in a short time.

On the other hand, according to the reinforcing tool 1 to which the present invention is applied, the rod-shaped first member 2 for abutting on the concrete surface 7 and the first member 2 are connected to the first member 2 in a length-adjustable manner to form a reinforced concrete structure. A second member 3 for abutting the steel material 8 having both ends fixed to the object 6 from the concrete surface 7 side is provided. As a result, according to the reinforcing tool 1 to which the present invention is applied, when a stress acts on the concrete 60, the stress can be transmitted from the concrete surface 7 to the steel material 8 via the first member 2 and the second member 3. can. That is, according to the reinforcing tool 1 to which the present invention is applied, the steel material 8 can be deformed so as to follow the behavior of the concrete 60 even when the concrete 60 is deformed, and the concrete 60 and the steel material 8 can be deformed. Oneness will be ensured. As a result, it is possible to suppress the occurrence of cracks in the concrete 60, secure the integrity with the reinforcing bar 80 that bears the stress acting on the concrete 60, and reinforce the reinforced concrete structure 6. ..

In particular, according to the reinforcing tool 1 to which the present invention is applied, the reinforced concrete structure 6 is immediately after being attached to the reinforced concrete structure 6 without a period until the cross-section repair material is hardened as in the conventional cross-section repair method. It is possible to exert the effect of reinforcing. As a result, even the reinforced concrete structure 6 in service can be effectively reinforced.

Further, according to the reinforcing tool 1 to which the present invention is applied, the tip portion 2a of the first member 2 is brought into contact with the chipping surface 72 as the concrete surface 7, and the reinforcing bar 80 as the steel material 8 is brought into contact with the chipping surface 72 side. It can be attached to the reinforced concrete structure 6 only by abutting the second member 3, and the construction can be performed in a short time.

According to the reinforcing tool 1 to which the present invention is applied, the second member 3 is connected to the first member 2 in an adjustable length. As a result, according to the reinforcing tool 1 to which the present invention is applied, the first member 2 can be reliably brought into contact with the concrete surface 7. In particular, according to the reinforcing tool 1 to which the present invention is applied, it is possible to reliably bring the first member 2 into contact with the chipping surface 72 on which the non-landing surface is formed.

According to the reinforcing tool 1 to which the present invention is applied, the second member 3 is formed with a recessed portion 32 recessed toward the concrete surface 7 side, and the recessed portion 32 is sandwiched between the plurality of first members 2 on both sides. It will be erected. As a result, according to the reinforcing tool 1 to which the present invention is applied, the steel material 8 can be fitted into the recessed portion 32, and even if stress is transmitted from the concrete 60 to the steel material 8, the steel material 8 is brought into contact with the steel material 8. 2 It is possible to prevent the member 3 from falling off. As a result, it is possible to stabilize the state in which the second member 3 is in contact with the steel material 8.

Further, according to the reinforcing tool 1 to which the present invention is applied, since the tip portions 2a of the plurality of first members 2 on both sides of the recessed portion 32 are brought into contact with the concrete surface 7, the concrete 60 is changed to the steel material 8. Even if the stress is transmitted, substantially the same stress acts on the first member 2 on both sides of the recessed portion 32, so that the state in which the first member 2 is in contact with the concrete surface 7 is stabilized. Is possible.

According to the reinforcing tool 1 to which the present invention is applied, the tip portion 2a of the first member 2 has a larger diameter than the stretched portion 2c. As a result, according to the reinforcing tool 1 to which the present invention is applied, the area of the tip portion 2a that comes into contact with the concrete surface 7 can be increased, and the tip portion 2a of the first member 2 is made of concrete in a more stable state. It can be brought into contact with the surface 7. Further, according to the reinforcing tool 1 to which the present invention is applied, the stress acting on the concrete 60 is efficiently transmitted from the concrete surface 7 to the first member 2 because the tip portion 2a has a larger diameter than the stretched portion 2c. It becomes possible.

According to the reinforcing tool 1 to which the present invention is applied, the first member 2 has a stretched portion 2c extending from the concrete surface 7 toward the steel material 8, and the base end portion 2b has a larger diameter than the stretched portion 2c. The second member 3 is hooked to the end portion 2b. As a result, according to the reinforcing tool 1 to which the present invention is applied, the second member 3 is locked to the base end portion 2b of the first member, and it is possible to prevent the second member 3 from falling off. Will be.

According to the reinforcing tool 1 to which the present invention is applied, the first member 2 and the second member 3 are the second member 3 that comes into contact with the steel material 8 by being composed of a metal that is lower than the steel material 8. The first member 2 that comes into contact with the second member 3 can function as a sacrificial anode of the steel material 8. Therefore, according to the reinforcing tool 1 to which the present invention is applied, it is possible to reduce the progress of corrosion of the steel material 8.

According to the reinforcing tool 1 to which the present invention is applied, the first member 2 and the second member 3 are made of a metal nobler than the steel material 8, so that the first member 2 and the second member 3 are corroded. Can be suppressed. Therefore, according to the reinforcing tool 1 to which the present invention is applied, the reinforcing tool 1 can be used for a long period of time, and the reinforced concrete structure 6 can be reinforced at a lower cost.

According to the reinforcing tool 1 to which the present invention is applied, it is possible to suppress the corrosion of the first member 2 and the second member 3 by applying the rust preventive agent.

According to the reinforcing tool 1 to which the present invention is applied, since the first member 2 and the second member 3 are made of resin, the first member 2 and the second member 3 are not corroded. Therefore, according to the reinforcing tool 1 to which the present invention is applied, the reinforcing tool 1 can be used for a long period of time, and the reinforced concrete structure 6 can be reinforced at a lower cost.

Next, a method for reinforcing a reinforced concrete structure to which the present invention is applied will be described. In the method for reinforcing a reinforced concrete structure to which the present invention is applied, the reinforcing tool 1 to which the present invention is applied is used.

The method for reinforcing a reinforced concrete structure to which the present invention is applied includes a chipping step, a mounting step, and a post-step.

In the chipping process, as shown in FIG. 4, first, a chipping portion 61 is formed by chipping the lower surface 71 side of the concrete 60 in the reinforced concrete structure 6 to be reinforced, and a steel material arranged inside the concrete 60. The reinforcing bar 80 as 8 is exposed. Further, in the chipping step, a chipping surface 72 as a concrete surface 7 facing the reinforcing bar 80 is formed at a position deeper than the reinforcing bar 80. In the chipping step, the chipping portion 61 may be formed by chipping a cross-section repair material previously placed on the lower surface 71 of the concrete 60.

Next, in the mounting step, as shown in FIG. 5, the reinforcing tool 1 is mounted on the reinforced concrete structure 6. In the mounting step, the tip portion 2a of the first member 2 is brought into contact with the concrete surface 7, and the second member 3 is brought into contact with the steel material 8 from the concrete surface 7 side.

Specifically, in the mounting step, as shown in FIG. 5A, the recessed portion 32 of the second member 3 is brought into contact with the reinforcing bar 80 exposed by the chipping step from the chipping surface 72 side. When the lower surface 71 side of the concrete 60 is chipped in the chipping step, the recessed portion 32 of the second member 3 is placed on the upper side of the reinforcing bar 80, and the reinforcing bar 80 is fitted into the recessed portion 32.

Then, in the mounting step, as shown in FIG. 5B, the first member 2 is inserted and screwed into the through hole 31 of the second member 3 from the lower side to the upper side, and is screwed into the second member 3. The first member 2 is connected. Then, in the attachment step, the washer 22 is attached to the tip portion 2a of the first member 2 inserted into the through hole 31 of the second member 3, and the tip portion 2a of the first member 2 to which the washer 22 is attached is attached to the chipping surface 72. Make a contact. In the mounting step, the second member 3 to which the first member 2 is connected may be brought into contact with the reinforcing bar 80, and then the tip portion 2a of the first member 2 may be brought into contact with the lower surface 71. Further, in the mounting step, the base end portion 2b of the first member 2 is brought into contact with the second member 3.

After the mounting process, a post-process is performed. In the post-process, when the first member 2 and the second member 3 attached in the attachment process are made of metal, a rust preventive agent is applied to the first member 2, the second member 3, and the reinforcing bar 80. , The first member 2, the second member 3, and the reinforcing bar 80 are left in an exposed state. Then, the reinforcement of the reinforced concrete structure 6 is completed.

According to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the tip portion 2a of the first member 2 is brought into contact with the chipping surface 72, and the second member 3 is brought into contact with the reinforcing bar 80 from the chipping surface 72 side. By doing so, when stress acts on the concrete 60, the stress can be transmitted from the chipping surface 72 to the reinforcing bar 80 via the first member 2 and the second member 3. As a result, it is possible to suppress the occurrence of cracks in the concrete 60, secure the integrity with the reinforcing bar 80 that bears the stress acting on the concrete 60, and reinforce the reinforced concrete structure 6. ..

In particular, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the reinforcing tool 1 is attached to the reinforced concrete structure 6 without a period until the cross-section repair material is hardened as in the conventional cross-section repair method. Immediately after that, the stress acting on the concrete 60 can be applied to the reinforcing bar 80 as well, so that the construction can be performed in a short time. Further, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the first member 2 is inserted into the through hole 31 of the second member 3 placed on the reinforcing bar 80, and the tip portion 2a of the first member 2 is inserted. Since the reinforcing tool 1 can be easily attached only by bringing it into contact with the chipping surface 72, the construction can be performed in a shorter time.

According to the method for reinforcing a reinforced concrete structure to which the present invention is applied, a chipping step of scraping the lower surface 71 side of the concrete 60 is provided. As a result, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the first member 2 is connected to the second member 3 with the second member 3 placed on the upper side of the reinforcing bar 80 in the mounting step. Can be done. Therefore, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the construction can be performed in a shorter time.

According to the method for reinforcing a reinforced concrete structure to which the present invention is applied, a post-process of leaving the first member 2 and the second member 3 in an exposed state is provided. As a result, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, a formwork for assembling a formwork for placing a cross-section repair material and a casting work for placing a cross-section repair material as in the conventional case can be performed. It can be omitted, and the construction can be performed in a short time.

Further, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the first member 2 or the temporarily left first member 2 or the second member 3 is provided with a post-process of leaving the first member 2 and the second member 3 in an exposed state. If the second member 3 has deteriorated due to corrosion or the like, it can be immediately visually confirmed. Further, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the reinforcing tool 1 to which the present invention is applied can be easily attached to the concrete surface 7 and the steel material 8, so that the deteriorated first member 2 or the first member 2 or the first member can be easily attached. 2 It is possible to easily replace the member 3 with a new one.

According to the method for reinforcing a reinforced concrete structure to which the present invention is applied, a post-process of applying a rust preventive agent to the first member 2 and the second member 3 made of metal is provided. As a result, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, it is possible to suppress corrosion of the first member 2 and the second member 3 even if they are left in an exposed state. Therefore, the reinforcing tool 1 can be used for a long period of time, and the reinforced concrete structure 6 can be reinforced at a lower cost. Further, by applying a rust preventive agent to the steel material 8 in the subsequent process, it is possible to suppress the corrosion of the steel material 8.

According to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the first member 2 and the second member 3 are made of a metal that is lower than the steel material 8 and thus come into contact with the steel material 8. The member 3 and the first member 2 that comes into contact with the second member 3 can function as a sacrificial anode of the steel material 8. Therefore, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, it is possible to reduce the progress of corrosion of the steel material 8.

In the method of reinforcing a reinforced concrete structure to which the present invention is applied, a mounting step of attaching a reinforcing tool 1 in which the first member 2 and the second member 3 are made of resin to the concrete surface 7 and the steel material 8 and a first step. A post-process may be provided in which the member 2 and the second member 3 are left in an exposed state. As a result, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, even if the first member 2 and the second member 3 made of resin are left in an exposed state, the first member 2 and the first member 2 and the second member 3 are left in an exposed state. 2 The member 3 and the member 3 do not corrode. Therefore, the reinforcing tool 1 can be used for a long period of time, and the reinforced concrete structure 6 can be reinforced at a lower cost.

In the method for reinforcing a reinforced concrete structure to which the present invention is applied, as shown in FIG. 6, after the attachment step, the chipping portion 61 formed in the chipping step is filled with a time-curable material 9 such as mortar. It may be provided with a process. As a result, by curing the time-curable material 9, the stress acting on the concrete 60 can be borne by the steel material 8 via the first member 2, the second member 3, and the cured time-curable material 9. ..

In particular, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, even if deformation or the like acts on the concrete, the steel material 8 can be deformed so as to follow the behavior of the concrete, and the concrete 60 and the time-curing property can be cured. It is possible to prevent a gap from being formed between the material 9 and the steel material 8 and the time-curable material 9. Therefore, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, the adhesion between the concrete 60 and the time-curable material 9 and the adhesion between the steel material 8 and the time-curable material 9 are firmly ensured. be able to. As a result, according to the method for reinforcing the reinforced concrete structure, it is possible to further secure the integrity with the steel material 8 that bears the stress acting on the concrete 60, and it is possible to more effectively reinforce the reinforced concrete structure 6. It becomes.

Further, according to the method for reinforcing a reinforced concrete structure to which the present invention is applied, since the first member 2, the second member 3, and the steel material 8 are covered with the time-curable material 9, deterioration such as corrosion thereof occurs. Can be suppressed. In the subsequent step, a rust preventive agent may be applied to the first member 2, the second member 3, and the steel material 8 as necessary before filling the time-curing material 9.

In the above-described embodiment, the embodiment in which the reinforcing tool 1 to which the present invention is applied is attached to the chipping surface 72 of the concrete 60 and the reinforcing bar 80 arranged inside the concrete 60 has been described, but other embodiments may be used. ..

FIG. 7 is a side view showing a first modification of the reinforced concrete structure 6 in which the reinforcing tool 1 to which the present invention is applied is used. In the embodiment shown in FIG. 7, the reinforcing tool 1 to which the present invention is applied is attached to the lower surface 71 of the concrete 60 and the tension member 81 arranged outside the concrete 60 at a predetermined distance from the lower surface 71. Become.

The reinforced concrete structure 6 has a lower surface 71 as a concrete surface 7 and a steel material 8 arranged outside the concrete 60 at a predetermined distance from the lower surface 71. The lower surface 71 is arranged so as to face the steel material 8. As the steel material 8, for example, a PC steel rod or the like is used, and a tension material 81 to which a tension force is applied in the longitudinal direction thereof is used. As the tension material 81, for example, a PC steel bar specified by the Japanese Industrial Standards (JIS G 3109) is used.

The tension member 81 is provided with fixing members 89 on both ends 81a in the longitudinal direction. The fixing member 89 is embedded and fixed in the concrete 60, and the tension member 81 is fixed to the concrete 60 at both ends 81a side via the fixing member 89. A reinforcing bar 80 is arranged inside the concrete 60.

In the reinforced concrete structure 6, a plurality of reinforcing tools 1 to which the present invention is applied are attached to the lower surface 71 of the concrete 60 and the tension member 81 at predetermined intervals in the longitudinal direction of the tension member 81. Further, the reinforcing tool 1 to which the present invention is applied is attached between the fixing members 89 provided at both ends 81a of the tension member 81, respectively.

FIG. 8 is a front view showing a state in which the reinforcing tool 1 to which the present invention is applied is attached to the lower surface 71 of the concrete 60 and the tension member 81, and FIG. 8 (b) is a side view of FIG. 8 (a). be. In the reinforcing tool 1 to which the present invention is applied, the tip portion 2a of the first member 2 is in contact with the lower surface 71 as the concrete surface 7, and the recessed portion 32 of the second member 3 is made into the tension material 81 as the steel material 8. It is abutted from the lower surface 71 side.

As a result, according to the reinforcing tool 1 to which the present invention is applied, when stress acts on the concrete 60, the stress is transmitted from the lower surface 71 of the concrete 60 to the tension member 81 via the first member 2 and the second member 3. Can be made to. As a result, it is possible to suppress the occurrence of cracks in the concrete 60, secure the integrity with the tension material 81 that bears the stress acting on the concrete 60, and reinforce the reinforced concrete structure 6. Become.

In particular, according to the reinforcing tool 1 to which the present invention is applied, the reinforcing tool 1 is attached to the lower surface 71 of the concrete 60 and the tension material 81 without a period until the cross-section repair material is hardened as in the conventional cross-section repair method. Immediately after mounting the reinforced concrete structure 6, it is possible to exert the effect of reinforcing the reinforced concrete structure 6. As a result, even the reinforced concrete structure 6 in service can be effectively reinforced.

Further, according to the reinforcing tool 1 to which the present invention is applied, the tip portion 2a of the first member 2 is in contact with the lower surface 71 of the concrete 60 as the concrete surface 7, and the tension material 81 as the steel material 8 is brought into contact with the lower surface of the concrete 60. It can be attached to the reinforced concrete structure 6 only by abutting the second member 3 from the 71 side, and the construction can be performed in a short time.

As described above, according to the reinforcing tool 1 to which the present invention is applied, it is possible to reinforce the reinforced concrete structure 6 by attaching the concrete 60 to the lower surface 71 of the concrete 60 without scraping the concrete 60.

FIG. 9 is a side view showing a second modified example of the reinforced concrete structure 6 in which the reinforcing tool 1 to which the present invention is applied is used. The reinforced concrete structure 6 has a lower surface 71 as a concrete surface 7 and a tension member 81 arranged outside the concrete 60 at a predetermined distance from the lower surface 71.

In the form shown in FIG. 9, the lower surface 71 as the concrete surface 7 is formed by hardening the cross-section repair material 91 cast in advance. In the reinforcing tool 1 to which the present invention is applied, the tip portion 2a of the first member 2 is brought into contact with the lower surface 71 formed by hardening the cross-section repair material 91, and the concrete 60 is spaced from the lower surface 71 at a predetermined distance. The second member 3 is brought into contact with the tension member 81 arranged outside the concrete material 81 from the lower surface 71 side.

As described above, the reinforcing tool 1 to which the present invention is applied can be attached to the lower surface 71 formed by hardening the cross-section repair material 91 to reinforce the reinforced concrete structure 6. Further, the cross-section repair material 91 can be supported by the reinforcing tool 1, and the cross-section repair material 91 can be prevented from peeling off.

In the above-described embodiment, the embodiment in which the tip portion 2a of the first member 2 is in contact with the chipping surface 72 formed by chipping the lower surface 71 side of the concrete 60 or the lower surface 71 of the concrete 60 has been described. However, the present invention is not limited to this, and the tip portion 2a of the first member 2 may be brought into contact with the chipping surface 72 formed by chipping the side surface side of the concrete 60 or the side surface of the concrete 60.

Further, in the above-described embodiment, the reinforced concrete structure 6 has been described by taking a bridge girder, a floor slab and the like as an example, but may be a pillar material. When the reinforced concrete structure 6 is a pillar material, the tip portion 2a of the first member 2 is brought into contact with the scraped surface 72 as a concrete surface 7 formed by scraping the side surface side of the concrete 60, and the concrete 60 is formed. The second member 3 is brought into contact with the reinforcing bar 80 as the steel material 8 arranged inside from the side surface side of the concrete 60. Of course, when the reinforced concrete structure 6 is a pillar material, the tip portion 2a of the first member 2 is in contact with the side surface of the concrete 60 as the concrete surface 7, and is arranged facing the side surface to the outside of the concrete 60. The tension material 81 as the steel material 8 arranged in may be abutted from the side surface side of the concrete 60.

Although the examples of the embodiments of the present invention have been described in detail above, all of the above-described embodiments are merely examples of the embodiment of the present invention, and the technical aspects of the present invention are thereby used. The scope should not be construed in a limited way.

1: Reinforcing tool 2: First member 2a: Tip portion 2b: Base end portion 2c: Stretched portion 21: Bolt 21a: Tip portion 22: Washer 211: Head 212: Shaft portion 3: Second member 31: Through hole 32 : Recessed part 6: Reinforced concrete structure 60: Concrete 61: Scraped part 7: Concrete surface 71: Bottom surface 72: Scraped surface 8: Steel material 80: Reinforcing bar 80a: Both ends 81: Tension material 81a: Both ends 89: Fixing member 9: Time-curing material 91: Cross-section repair material

Claims (9)

It is a reinforcing structure of a reinforced concrete structure for reinforcing a reinforced concrete structure.
A steel material whose both ends are fixed to the reinforced concrete structure,
With a reinforcing tool attached to the steel material,
The steel material is arranged so that the central portion is separated from the chipping surface formed by chipping the concrete structure.
The reinforcing tool is
The rod-shaped first member and
It has a second member connected to the first member so as to be adjustable in length, and has a second member.
The first member is in contact with the chipping surface, and the first member is brought into contact with the chipping surface.
The second member is arranged between the chipping surface and the steel material and is in contact with the steel material.
Reinforced structure of reinforced concrete structure characterized by. The reinforcing tool is to be embedded in a time-curing material filled in a portion where the reinforced concrete structure is chipped.
1. The reinforced structure of the reinforced concrete structure according to claim 1. The reinforcement is exposed from the reinforced concrete structure and
The chipped surface should be exposed
1. The reinforced structure of the reinforced concrete structure according to claim 1. It is a method of reinforcing a reinforced concrete structure to reinforce a reinforced concrete structure.
A chipping step of scraping the concrete of the reinforced concrete structure to expose the steel material fixed at both ends to the reinforced concrete structure,
It is provided with a mounting step of attaching a reinforcing tool having a rod-shaped first member and a second member connected to the first member so as to be adjustable in length to the steel material exposed by the chipping step.
In the mounting step, the second member is brought into contact with the steel material from the concrete surface side of the reinforced concrete structure, the first member is connected to the second member, and the first member is brought into contact with the concrete surface. A method of reinforcing a reinforced concrete structure, which is characterized by being made to. The method for reinforcing a reinforced concrete structure according to claim 4 , wherein in the chipping step, the lower surface side of the concrete is chipped. The method for reinforcing a reinforced concrete structure according to claim 4 or 5 , further comprising a post-step of filling the portion of the concrete that has been chipped with a time-curable material after the mounting step. The method for reinforcing a reinforced concrete structure according to claim 4 or 5 , further comprising a post-step of leaving the first member and the second member in an exposed state after the mounting step. In the attachment step, the reinforcing tool in which the first member and the second member are made of metal is attached to the reinforced concrete structure.
The method for reinforcing a reinforced concrete structure according to claim 7 , wherein in the post-process, a rust preventive agent is applied to the first member and the second member. The method for reinforcing a reinforced concrete structure according to claim 7 , wherein in the mounting step, the reinforcing tool in which the first member and the second member are made of resin is attached to the reinforced concrete structure.

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