JP2013189845A - Repair structure of steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair structure of steel material, which allows a corrosion part to be reinforced with a simple structure.SOLUTION: A repair structure of steel material for repairing a corrosion part C formed in the surface of a steel material S includes a first reinforcement resin layer 2 which fills the corrosion part C and covers the outer periphery of the corrosion part C, a second reinforcement resin layer 3 which covers the whole of the first reinforcement resin layer 2, a reinforcement material 4 which is arranged between the first reinforcement resin layer 2 and the second reinforcement resin layer 3 so as to be embedded in resin material to constitute the first reinforcement resin layer 2 and the second reinforcement resin layer 3, and a plurality of displacement prevention members 5 which are fixed to the corrosion part C and the outer periphery thereof and covered at least with the first reinforcement resin layer 2. The displacement prevention member 5 is composed of a bolt 52 including an enlarged diameter part 52a with a diameter larger than the diameter of an insertion hole 51 bored in a steel material S.

Description

  The present invention relates to a steel material repair structure, and more particularly to a steel material repair structure suitable for repairing a corroded portion in a steel structure using steel materials such as bridges, sluices, buildings, marine structures, and plants.

  Steel materials (steel materials) can be adjusted in strength, corrosion resistance, heat resistance, magnetic properties, coefficient of thermal expansion, etc., depending on the carbon content and heat treatment method, and various types of products are manufactured. It is used in various structures such as bridges, sluices, buildings, offshore structures, and plants. In these steel structures, steel is often used as a member that supports a load, and requires a certain strength. On the other hand, steel structures are often installed in a state exposed to the outdoors, and steel materials are easily corroded due to adhesion of moisture. When the steel material is corroded, the thickness is partially reduced, the strength is lowered, and there is a risk of buckling. Therefore, it is necessary to repair the corroded steel material, but the steel structure described above is often large, and replacing the entire steel material with partial corrosion is inefficient and requires large replacement work. End up. In particular, when the steel structure is an infrastructure facility such as a bridge, the use of the facility must be stopped when the steel material is replaced, which has a great social impact.

  For example, in the column of the prior art of Patent Document 1, it is described that a method of joining a reinforcing plate with a high-strength bolt is frequently used. As a method for improving the drawbacks of such a repair method, an existing steel girder is used. A method of repairing by filling reinforced concrete in a site where reinforcement is required and a method of welding a stud to a site where reinforcement of an existing steel girder is required, attaching a reinforcing bar using the stud, and then filling and repairing concrete are described. .

  In Patent Document 2, a reinforcing plate (steel plate) is fixed to the top or bottom of a bridge to form a cavity, and a thermosetting material such as a plastic or a polymer material is injected into the cavity. It describes how to reinforce or repair elevated railway bridges without interrupting service.

  Patent Document 3 describes a method for reinforcing a steel structure in which a reinforcing fiber material is bonded via an epoxy resin adhesive in which crosslinked rubber fine particles are dispersed. Specifically, as a test example, it is described that the above-described epoxy resin adhesive is applied to the bottom surface of an I-shaped steel to form a primer layer, and a fiber reinforced sheet is laminated thereon.

JP 2002-266319 A Special table 2008-520867 gazette JP 2004-107944 A

  However, in the repair method described in Patent Document 1 described above, since concrete is used, the repaired portion is likely to be a heavy object, and preparation for concrete construction that increases the load on the steel structure is required. There were problems such as being troublesome and taking time to complete curing.

  Moreover, the repair method described in Patent Document 2 and Patent Document 3 described above can be applied to repair of a corroded steel material. However, in the repair method described in Patent Document 2, the reinforcing plate that forms the cavity must be fixed to the steel structure, the reinforcing plate is likely to be heavy, the fixing means is also easily increased in size, and the installation area In addition, there is a problem that the installation space tends to be large. In the repair method described in Patent Document 3, the fiber reinforced sheet is bonded to the surface of the corroded steel structure. However, in the case of a large structure such as a bridge, the fiber reinforced sheet has sufficient strength. There is a problem that (for example, compressive strength and tensile strength) cannot be obtained.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a steel material repair structure that can reinforce a corroded portion with a simple structure.

  According to the present invention, there is provided a steel material repair structure for repairing a corroded portion formed on the surface of a steel material, the first reinforcing resin layer being filled in the corroded portion and covering the outer periphery of the corroded portion, A second reinforcing resin layer covering the entire reinforcing resin layer; and the first reinforcing resin layer and the second reinforcing resin layer disposed between the first reinforcing resin layer and the second reinforcing resin layer. A reinforcing material embedded in the resin agent, and a plurality of slip preventing members fixed to the corroded portion and the outer periphery thereof and covered with at least the first reinforcing resin layer, and the slip preventing member is formed on the steel material. It is comprised by the bolt provided with the enlarged diameter part which has a diameter larger than the diameter of the penetration hole drilled, the stud bolt welded to the said steel materials, or the all screw bolts screwed by the screw hole drilled in the said steel materials. Steel material repair structure characterized by There is provided.

  The bolt may be a double screw bolt having the enlarged diameter portion at the center, or a single screw bolt having the enlarged diameter portion at the base of the head.

  The misalignment stopping member may have a nut that is screwed onto the bolt, the stud bolt, or the full screw bolt. The nut may be screwed inside the reinforcing material, may be screwed outside the reinforcing material, or may be screwed inside and outside the reinforcing material.

  The first reinforcing resin layer and the second reinforcing resin layer may be composed of an epoxy resin agent. You may mix | blend a fiber material, a metal material, a ceramic material, a stone material, or these mixed materials with the said epoxy resin agent.

  The reinforcing material may be a mesh, a thin steel plate, a punching metal, or a three-dimensional woven fabric. Moreover, you may have the auxiliary | assistant reinforcement material arrange | positioned under said 1st reinforcement resin layer.

  You may make it arrange | position the said 1st reinforcement resin layer, the 2nd reinforcement resin layer, the said reinforcement material, and the said slip prevention member on both surfaces of the said steel material which has the said corrosion part.

  The steel material may include a plurality of reinforcing steel materials arranged in the longitudinal direction, and the first reinforcing resin layer may be formed over the entire area between the adjacent reinforcing steel materials.

  Furthermore, you may make it stick the fall prevention sheet for peeling prevention so that the surface of said 2nd reinforcement resin layer may be covered.

  According to the steel material repair structure according to the present invention described above, the corroded portion is repaired with a simple structure by repairing the corroded portion using the reinforcing resin agent and embedding the reinforcing material in the reinforcing resin agent. Can do. Further, since concrete or a large reinforcing plate is not used, it is possible to reduce the weight of the repair structure and improve workability. Further, even if the corroded portion exists in a narrow portion or a corner portion, it can be easily repaired.

  In particular, by constructing the displacement prevention member with a bolt having an enlarged diameter portion or a stud bolt to be welded, the displacement prevention member can be fixed so as not to cause backlash with respect to the steel material. Damage to the steel material repair structure due to play can be suppressed, the effect of the steel material repair structure can be enhanced, and the life can be extended.

It is a whole block diagram which shows the steel material repair structure which concerns on 1st embodiment of this invention, (a) is a top view, (b) has shown BB sectional drawing in Fig.1 (a). It is an enlarged view which shows a slip prevention member, (a) is 1st embodiment, (b) is a 1st modification, (c) is a 2nd modification, (d) has shown the 3rd modification. . It is a figure which shows the construction method of the steel material repair structure shown in FIG. 1, (a) is the state before construction, (b) is a 1st process, (c) is a 2nd process, (d) is a 3rd process, (e) shows the fourth step, (f) shows the fifth step, and (g) shows the sixth step. It is sectional drawing which shows the steel material repair structure which concerns on other embodiment of this invention, (a) has shown 2nd embodiment, (b) has shown 3rd embodiment. It is sectional drawing which shows the steel material repair structure which concerns on other embodiment of this invention, (a) is 4th embodiment, (b) is 5th embodiment, (c) is 6th embodiment, (d) is The seventh embodiment, (e) shows the eighth embodiment. It is explanatory drawing at the time of repairing the corrosion part of a steel girder bridge, (a) shows the block diagram of a steel girder bridge, (b) shows the corrosion part before repair, (c) shows the corrosion part after repair, Yes. It is explanatory drawing at the time of repairing the corrosion part of a truss bridge, (a) is a block diagram of a truss bridge, (b) has shown the corrosion part before repair, (c) has shown the corrosion part after repair. It is an enlarged view which shows the other modification of a slip prevention member, (a) has shown the 4th modification, (b) has shown the 5th modification. It is a whole block diagram which shows the steel material repair structure which concerns on 9th embodiment of this invention, (a) is a top view, (b) has shown BB sectional drawing in Fig.9 (a).

  Hereinafter, an embodiment of a steel material repair structure according to the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall configuration diagram showing a steel material repair structure according to the first embodiment of the present invention, (a) is a plan view, (b) is a BB cross-sectional view in FIG. Is shown. FIG. 2 is an enlarged view showing a misalignment prevention member, in which (a) is a first embodiment, (b) is a first modification, (c) is a second modification, (d) is a third modification, Is shown. FIG. 2 shows a state before the resin layer is formed.

  The steel material repair structure 1 which concerns on 1st embodiment of this invention is a steel material repair structure which repairs the corrosion part C formed in the surface of steel materials S, as shown to Fig.1 (a) and (b). The first reinforcing resin layer 2 that fills the corroded portion C and covers the outer periphery of the corroded portion C, the second reinforcing resin layer 3 that covers the entire first reinforcing resin layer 2, and the first reinforcing resin layer 2 The reinforcing material 4 disposed between the first reinforcing resin layer 2 and the second reinforcing resin layer 3 and embedded in the resin agent constituting the first reinforcing resin layer 2 and the second reinforcing resin layer 3, and the corroded portion C and the outer periphery thereof are fixed to at least the first A plurality of misalignment prevention members 5 covered by one reinforcing resin layer 2, and the misalignment prevention member 5 includes an enlarged diameter portion 52 a having a diameter larger than the diameter of the insertion hole 51 perforated in the steel material S. It is constituted by a bolt 52.

  The first reinforcing resin layer 2 and the second reinforcing resin layer 3 are made of, for example, a high-strength resin agent such as an epoxy resin agent. Such a high-strength resin agent is cured by mixing a curing agent, is excellent in adhesiveness, and has a certain strength (for example, compressive strength and tensile strength). For example, when the steel material S has a thickness of about 10 mm, the first reinforcing resin layer 2 and the second reinforcing resin layer 3 are each set to about 5 to 10 mm. The 1st reinforcement resin layer 2 and the 2nd reinforcement resin layer 3 may be comprised by the same resin agent, and may be comprised by a different resin agent in consideration of functionality. Further, the surface of the second reinforcing resin layer 3 may be coated or painted with effects such as waterproofing, rust prevention, and aesthetic improvement. The high-strength resin agent that forms the first reinforcing resin layer 2 is not limited to the epoxy-based resin agent, and any other high-strength resin may be used as long as it is a resin agent having a certain adhesion and a certain strength. An agent may be used.

  The reinforcing material 4 is constituted by, for example, a mesh. A rebar means a rebar (including a stainless steel rebar) formed in a mesh or lattice. The reinforcing material 4 is disposed before the first reinforcing resin layer 2 is cured, and a part of the reinforcing bars constituting the reinforcing material 4 is embedded in and bonded to the first reinforcing resin layer 2. Further, the second reinforcing resin layer 3 is formed on the first reinforcing resin layer 2 and the reinforcing material 4, and a part of the reinforcing bar constituting the reinforcing material 4 is embedded in the second reinforcing resin layer 3. It is sandwiched between the first reinforcing resin layer 2 and the second reinforcing resin layer 3.

  In this way, the reinforcing material 4 is sandwiched by the high-strength resin agent and the upper surface of the corroded portion C is covered to compensate for the thinning of the corroded portion C, and the stress acting on the steel material S is reduced to the first reinforcing resin layer 2 and It can be transmitted to the reinforcing material 4 through the second reinforcing resin layer 3, and buckling and damage can be suppressed.

  Moreover, the resin layer which has the 1st reinforcement resin layer 2, the 2nd reinforcement resin layer 3, and the reinforcement material 4 mentioned above is formed in both surfaces of the steel material S which has the corrosion part C. FIG. With this configuration, the thinned portion of the corroded portion C can be supplemented by the resin layers formed on both surfaces of the steel material S, and buckling and damage of the steel material S can be suppressed. Moreover, by forming the resin layer on both surfaces, the resin layer on one side can be formed thin, and the weight of the resin layer on each surface can be reduced.

  The displacement preventing member 5 is used to suppress the dropping of the resin layer having the first reinforcing resin layer 2, the second reinforcing resin layer 3 and the reinforcing material 4 from the steel material S and to transmit stress acting on the steel material S. It is a member. As shown in the figure, the displacement preventing member 5 is disposed on the corroded portion C and the outer periphery thereof, and is covered with the first reinforcing resin layer 2 and the second reinforcing resin layer 3. For example, if the steel material S has a thickness of about 10 mm, and the corroded portion C has a depth of about 3 mm or less, the influence on the steel material S even if the displacement preventing member 5 is arranged in the corroded portion C is not affected. Few. When the insertion hole 51 is drilled in the corroded portion C, it is calculated whether or not the bearing surface of the insertion hole 51 (the contact surface between the inner peripheral surface of the insertion hole 51 and the outer peripheral surface of the bolt 52) does not yield. There is a need.

  For example, as shown in FIG. 2A, the displacement preventing member 5 includes a bolt 52 provided with an enlarged diameter portion 52 a having a diameter larger than the diameter of the insertion hole 51 drilled in the steel material S, and a bolt 52. And a nut 53 to be screwed together. The bolt 52 is constituted by, for example, a double screw bolt having an enlarged diameter portion 52a at the center, and tapered portions 52b are formed at both ends of the enlarged diameter portion 52a. If the diameter of the threaded portion of the bolt 52 is d1, the diameter of the insertion hole 51 is d2, and the diameter of the enlarged diameter portion 52a is d3, the relationship d3> d2 ≧ d1 is established. When the M6 bolt 52 is used, the difference Δd between the diameter d3 of the enlarged diameter portion 52a and the diameter d2 of the insertion hole 51 is set in a range of 0 <Δd ≦ 0.3 mm, for example.

  The bolt 52 is fixed to the insertion hole 51 by driving it into the insertion hole 51 formed in the steel material S with a hammer or the like. Since the diameter d2 of the enlarged diameter portion 52a is formed larger than the diameter d2 of the insertion hole 51, tapered portions 52b are formed at both ends of the enlarged diameter portion 52a so as to facilitate insertion when driven. In FIG. 2A, the enlarged diameter portion 52a is inserted into the insertion hole 51 while being plastically deformed. Therefore, the diameter d3 of the enlarged diameter portion 52a and the diameter d2 of the insertion hole 51 are substantially equal. It is illustrated as follows.

  Moreover, although the bolt 52 is being fixed to the insertion hole 51 by the enlarged diameter part 52a, it can be used as a retaining prevention of the volt | bolt 52 by screwing the nut 53 to the thread part of both ends just in case. . Further, the screw thread of the bolt 52 and the screwed nut 53 form irregularities on the surface of the bolt 52 to form a catching portion between the first reinforcing resin layer 2 and the second reinforcing resin layer 3, and a slip prevention member The holding power of the resin layer 5 can be improved. The nut 53 does not need to be screwed up to a position adjacent to the enlarged diameter portion 52 a, and may be screwed up to an intermediate portion, or may be screwed until both ends of the bolt 52 protrude from the nut 53. The thread of the part may be crushed.

  According to the displacement preventing member 5 described above, in the state in which the bolt 52 is driven into the insertion hole 51, there is no gap between the insertion hole 51 and the bolt 52 (the enlarged diameter portion 52a), and the backlash of the bolt 52 is reduced. Can be suppressed. Therefore, the slip prevention member 5 can be fixed to the steel material S so as not to be loosened, the steel repair structure 1 can be prevented from being damaged due to the backlash of the slip prevention member 5, and the steel material repair structure 1. The effect of this can be improved and the lifetime can be extended. In addition, the slip prevention member 5 is not limited to the number and arrangement shown in FIG. 1A, but depends on the size and depth of the corroded portion C, the thickness of the steel material S, the type of resin agent to be used, and the like. Accordingly, the number and arrangement are appropriately changed.

  In the first modification of the slip prevention member 5 shown in FIG. 2B, the enlarged diameter portion 52 a is configured by unevenness formed on the surface of the bolt 52. The enlarged diameter portion 52a may be formed so as to be larger than the diameter d2 of the insertion hole 51 over the entire area as shown in FIG. 2A, or as shown in FIG. Alternatively, it may be formed to be partially larger than the diameter d2 of the insertion hole 51. Note that the uneven shape of the enlarged diameter portion 52a is not limited to the illustrated shape, and may be a V-shaped or cross-shaped patterned unevenness.

  A second modification of the slip prevention member 5 shown in FIG. 2C is configured by a stud bolt 54 welded to the steel material S. Even when the stud bolt 54 is welded to the steel material S in this way, the displacement preventing member 5 can be fixed to the steel material S so as not to be rattled, and the steel material repair structure 1 resulting from the play of the displacement preventing member 5 is as follows. Damage can be suppressed, the effect of the steel material repair structure 1 can be enhanced, and the life can be extended. Note that, the thread of the stud bolt 54 can improve the catching between the first reinforcing resin layer 2 and the second reinforcing resin layer 3.

  In addition, when the tensile force is likely to act on the steel material S in the steel structure, the displacement preventing member 5 is configured by the stud bolt 54, and when the compressive force is likely to act on the steel material S, the displacement preventing member 5 is provided. The misalignment prevention member 5 may be properly used depending on the use environment of the steel material S, such as being configured by the bolt 52.

  In the third modification of the slip prevention member 5 shown in FIG. 2D, a nut 53 is screwed into the stud bolt 54 shown in the second modification. Here, a state in which the nut 53 is screwed in until both ends of the stud bolt 54 protrude from the nut 53 and the screw threads at both ends of the stud bolt 54 are crushed is illustrated. With such a configuration, the nut 53 can be prevented from falling off, and the catching between the first reinforcing resin layer 2 and the second reinforcing resin layer 3 can be improved. Note that the nut 53 may be screwed up to an intermediate portion or a root portion of the stud bolt 54.

  Next, the construction method of the steel material repair structure 1 which concerns on 1st embodiment mentioned above is demonstrated. Here, FIG. 3 is a figure which shows the construction method of the steel material repair structure shown in FIG. 1, (a) is the state before construction, (b) is a 1st process, (c) is a 2nd process, ( d) shows the third step, (e) shows the fourth step, (f) shows the fifth step, and (g) shows the sixth step.

  As shown to Fig.3 (a), the corrosion part C is formed in the steel material S before construction of the steel material repair structure 1. As shown in FIG. That is, the steel material repair structure 1 according to the present embodiment is constructed in order to improve the strength of the steel material S that has been thinned by repairing the corroded portion C and to extend the life. Moreover, you may make it wash | clean or clean the part (the corrosion part C and the steel material S surface) which forms the 1st reinforcement resin layer 2 and the 2nd reinforcement resin layer 3 in this state.

  The first step shown in FIG. 3B is a step of drilling the insertion hole 51 in the steel material S. Specifically, a worker performs a drilling operation using a tool such as a drill. In addition, when comprising the slip prevention member 5 with the stud bolt 54, this 1st process (drilling process) can be skipped.

  The second step shown in FIG. 3C is a step of driving a bolt 52 that constitutes the displacement preventing member 5 into the insertion hole 51. Specifically, the worker performs a driving operation using a tool such as a hammer. In the case where the displacement preventing member 5 is constituted by the stud bolt 54, the second step (driving step) is changed to a step of welding the stud bolt 54 to the steel material S.

  The third step shown in FIG. 3D is a step of screwing the nut 53 into the bolt 52 fixed to the steel material S. Specifically, an operator screws a nut 53 into each bolt 52. The slip prevention member 5 can be disposed on both surfaces of the steel material S by the first to third steps described above.

  The fourth step shown in FIG. 3 (e) is a step of forming the first reinforcing resin layer 2 on the front surface and the back surface of the steel material S including the corroded portion C. The range (area) and thickness for forming the first reinforcing resin layer 2 are set according to the size and depth of the corroded portion C so that the strength to be reinforced can be supplemented and the reinforcing material 4 can be supported. Is set. A plurality of corroded portions C may be covered with the same first reinforcing resin layer 2.

  The fifth step shown in FIG. 3F is a step of disposing the reinforcing material 4 on the first reinforcing resin layer 2. The reinforcing material 4 is disposed before the first reinforcing resin layer 2 is cured, and is pressed so that a part of the reinforcing material 4 (for example, mesh) is embedded in the first reinforcing resin layer 2.

  The sixth step shown in FIG. 3G is a step of forming the second reinforcing resin layer 3 from above the reinforcing material 4. At this time, the second reinforcing resin layer 3 is formed so as to cover the entire reinforcing material 4 and the first reinforcing resin layer 2. By forming the outer peripheral portion of the second reinforcing resin layer 3 in a tapered shape, it is possible to improve adhesiveness and waterproofness. The surface of the second reinforcing resin layer 3 may be coated or painted.

  By the construction method described above, the first reinforcing resin layer 2, the second reinforcing resin layer 3, the reinforcing material 4, and the displacement preventing member 5 can be disposed on both surfaces of the steel material S having the corroded portion C. The steel material repair structure 1 according to the embodiment can be formed on the steel material S. In the construction method described above, the case where the resin layers on both surfaces of the corroded portion C are simultaneously formed has been described. However, after forming the resin layer on the front surface side of the corroded portion C, the resin layer on the back surface side is formed. It may be.

  Next, a steel material repair structure 1 according to another embodiment of the present invention will be described with reference to FIGS. 4 and 5. Here, FIG. 4 is sectional drawing which shows the steel material repair structure which concerns on other embodiment of this invention, (a) is 2nd embodiment, (b) has shown 3rd embodiment. FIG. 5 is a cross-sectional view showing a steel material repair structure according to another embodiment of the present invention, in which (a) is a fourth embodiment, (b) is a fifth embodiment, (c) is a sixth embodiment, (D) shows a seventh embodiment, and (e) shows an eighth embodiment. In addition, about the same component as the steel material repair structure 1 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The steel material repair structure 1 according to the second embodiment shown in FIG. 4A is obtained by blending a fiber material 6 with an epoxy resin agent constituting the second reinforcing resin layer 3. For the fiber material 6, steel fiber, polypropylene fiber, ceramic fiber or the like is used. The fiber material 6 may also be blended in the first reinforcing resin layer 2. By mix | blending this fiber material 6 with a resin agent, the generation | occurrence | production and progress of a crack of a resin layer and a crack can be suppressed.

  The steel material repair structure 1 according to the third embodiment shown in FIG. 4B is obtained by blending a metal material 7 with an epoxy resin agent constituting the second reinforcing resin layer 3. For the metal material 7, metal powder such as iron powder and aluminum powder, metal particles such as iron particles and aluminum particles, metal balls such as iron balls and aluminum balls, and the like can be used. The diameter of the metal material 7 is adjusted to 3 mm or less, for example. The metal material 7 may be blended also in the first reinforcing resin layer 2. By mix | blending this metal material 7 with a resin agent, the intensity | strength of a resin layer can be improved. In place of the metal material 7, a ceramic material may be used, a metal material 7 or a mixed material in which a ceramic material is mixed may be used, and the fiber material 6 is mixed with the metal material 7 or the ceramic material. Mixed materials may be used.

  Further, a stone material may be used instead of the metal material 7. As the stone, for example, a material having a size classified as a fine aggregate (specifically, a material that passes through a 10 mm sieve and passes a 5 mm sieve by 85% or more by mass) is used. Stone types include, for example, sandstone, mudstone, conglomerate, chert limestone, tuffstone, rhyolite, andesite, basalt, granite, diorite, hanleyite, schist, gneiss, Amphibolite, green rock, olivine, marble, quartz, silica, quartz sand, plagioclase, potash feldspar, orthopyroxene, clinopyroxene, amphibolite, garnet, muscovite, biotite, chlorite, Magnetite, pyrite, volcanic glass, rock fragments, etc. can be used. The stone material preferably has a Mohs hardness of about 2.5 or more. Note that a mixed material obtained by mixing a stone material with the metal material 7 or a ceramic material may be used, or a mixed material obtained by mixing the fiber material 6 with the stone material may be used.

  The steel material repair structure 1 according to the fourth embodiment shown in FIG. 5A uses a thin steel plate for the reinforcing material 4. The reinforcing material 4 is not limited to the mesh, and may be replaced with another strength member. Furthermore, the reinforcing material 4 may be a metal plate (for example, punching metal) other than a thin steel plate, a three-dimensional woven fabric, or the like as long as it has a predetermined strength.

  In the steel material repair structure 1 according to the fifth embodiment shown in FIG. 5B, the reinforcing material 4 is fixed to the displacement preventing member 5. When the reinforcing member 4 is fixed to the displacement preventing member 5, the bolt 52 is set to a length that penetrates the reinforcing member 4, and the second nut 55 is tightened from the outside of the nut 53 that fixes the displacement preventing member 5. The reinforcing material 4 may be sandwiched between the nut 53 and the second nut 55. The nut 53 also functions as a spacer for positioning the reinforcing material 4. The nut 53 may be replaced with a simple spacer that does not have a tightening function. The second nut 55 is covered with the second reinforcing resin layer 3.

  In this way, when the reinforcing material 4 is fixed to the displacement preventing member 5, the stress applied to the steel material S can be reliably transmitted to the reinforcing material 4 via the displacement preventing member 5 and effectively corroded. Part C can be reinforced. In addition, when the steel material S is easily bent only in one direction, only one of the reinforcing members 4 may be fixed to the displacement preventing member 5.

  In the steel material repair structure 1 according to the sixth embodiment shown in FIG. 5 (c), the nut 53 of the slip prevention member 5 is arranged outside the reinforcing material 4. Even with this configuration, the nut 53 functions as a retaining member for the bolt 52. As shown in the first embodiment, the fifth embodiment, and the sixth embodiment described above, the nut 53 (including the second nut 55) may be screwed into the reinforcing member 4 or may be reinforced. It may be screwed to the inside and the outside of the material 4, or may be screwed to the outside of the reinforcing material 4.

  In the steel material repair structure 1 according to the seventh embodiment shown in FIG. 5D, a resin layer is formed only on one surface of the steel material S. In the seventh embodiment, for example, a single screw bolt 56 having an enlarged diameter portion 52a at the base of the head portion 56a is used as the displacement preventing member 5. The head 56a of the single screw bolt 56 exposed on the surface of the steel material S is covered with a resin agent, painted, or covered with a bolt cap to take measures against waterproofing and rust. May be.

  In the steel material repair structure 1 according to the eighth embodiment shown in FIG. 5 (e), the auxiliary reinforcing material 8 is arranged under the first reinforcing resin layer 2. The sub-reinforcing member 8 is a member for further reinforcing the strength of the corroded corrosion portion C, and is formed of, for example, a thin steel plate, a mesh, a punching metal, or the like. The auxiliary reinforcing material 8 has a minimum area that can cover the corroded portion C, and is directly fixed to the surface of the steel material S by the shift preventing member 5. With such a configuration, the corrosion portion C can be covered and the strength can be effectively reinforced. In addition, the gap between the corroded portion C and the auxiliary reinforcing material 8 may be filled with a high-strength resin agent that forms the first reinforcing resin layer 2 or may remain hollow.

  Next, a case where the steel material repair structure 1 according to this embodiment described above is applied to a bridge will be described with reference to FIGS. 6 and 7. Here, FIG. 6 is an explanatory diagram when repairing a corroded portion of a steel girder bridge, (a) is a block diagram of the steel girder bridge, (b) is a corroded portion before repair, and (c) is after repairing. This shows the corroded part. FIG. 7 is an explanatory diagram when repairing a corroded portion of a truss bridge, (a) is a configuration diagram of the truss bridge, (b) is a corroded portion before repair, (c) is a corroded portion after repair, Show.

  A steel girder bridge 9 shown in FIG. 6A includes, for example, a bridge girder 91 disposed at both ends and an intermediate portion, a steel material 92 supported on the bridge girder 91, and a road supported on the steel material 92. And an upper structure 93 constituting the track. The steel material 92 is made of, for example, I-shaped steel and has a plurality of vertical reinforcing steel materials 94 arranged in the longitudinal direction.

  FIG.6 (b) is the A section enlarged view in Fig.6 (a). As illustrated, the steel material 92 (I-shaped steel) has a web 92a and a flange 92b, and the vertical reinforcing steel material 94 is welded to the web 92a and the flange 92b. Since the flange 92b of the steel material 92 is formed so as to form a substantially horizontal plane, moisture such as rain water is likely to accumulate on the surface and corrodes easily. For example, when the corroded portion C is generated in the flange 92b, the steel material S can be repaired using the steel material repair structure 1 of any of the first to eighth embodiments described above.

  As shown in FIG. 6C, when the vertical reinforcing steel material 94 is disposed on the steel material 92, the first reinforcing resin layer 2 is formed over the entire area between the adjacent vertical reinforcing steel materials 94. . Therefore, the steel material repair structure 1 of any of the first to eighth embodiments described above is formed over the entire surface of the flange 92b between the adjacent vertical reinforcing steel materials 94. Thus, by filling the space between the vertical reinforcing steel members 94 with the steel material repair structure 1, the stress distribution generated in the flange 92b can be made uniform, and the stress concentration can be suppressed. The steel material repair structure 1 is actually constructed so as to extend to the outside of the flange 92b (so as to cover the end face of the flange 92b). A portion extended to the outside of 92b is illustrated by a virtual line (dashed line).

  The truss bridge 10 shown in FIG. 7A includes, for example, an upper chord material 101 and a lower chord material 102 that form an outer shape, a gusset plate 103 that is fixed to the upper chord material 101 or the lower chord material 102, and both ends of the truss bridge 10 are gusset plates 103. A diagonal member 104 to be fixed. In general, in the truss bridge 10, the upper chord member 101, the lower chord member 102, the gusset plate 103, and the diagonal member 104 are all made of steel, and for example, the diagonal member 104 is often made of H-shaped steel. Further, the truss bridge 10 is not limited to the illustrated upper-type warren truss, and may be a lower-path type or other truss structure such as a platform truss or a howtruss. In such a truss bridge, fasteners such as rivets and bolts are used at the connecting portion between the gusset plate 103 and the upper chord member 101, the lower chord member 102, and the diagonal member 104, and moisture such as rain water collects in the connecting portion. It is easy.

  FIG.7 (b) is the B section expanded sectional view in Fig.7 (a). As shown in the figure, the diagonal member 104 is often connected to the upper portion of the gusset plate 103, and moisture accumulated at the connecting portion between the diagonal member 104 and the gusset plate 103 travels down along the surface of the gusset plate 103. It is easy to flow. Therefore, the gusset plate 103 around the connecting portion of the diagonal member 104 is easily corroded.

  For example, as shown in FIG.7 (c), when the corrosion part C has arisen on the surface of the gusset plate 103, the steel material repair structure 1 in any one of 1st embodiment-8th embodiment mentioned above is used. Thus, the steel material S can be repaired.

  Here, FIG. 8 is an enlarged view showing another modified example of the slip prevention member, where (a) shows a fourth modified example and (b) shows a fifth modified example. Moreover, FIG. 9 is a whole block diagram which shows the steel material repair structure which concerns on 9th embodiment of this invention, (a) is a top view, (b) is BB sectional drawing in Fig.9 (a), Show. In addition, in each figure, about the component same as embodiment or the modification mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The fourth modification of the misalignment prevention member 5 shown in FIG. 8A is configured by the full displacement bolt 58 screwed into the screw hole 57 perforated in the steel material S. Even with such a configuration, the displacement preventing member 5 can be fixed to the steel material S so as not to be rattled, and the damage of the steel material repair structure 1 due to the play of the displacement preventing member 5 can be suppressed. While the effect of the repair structure 1 can be improved, the lifetime can also be extended. In addition, the hook of the 1st reinforcement resin layer 2 and the 2nd reinforcement resin layer 3 can also be improved with the thread of the all screw bolt 58. FIG.

  In the fifth modification of the misalignment prevention member 5 shown in FIG. 8B, a nut 53 is screwed to the full screw bolt 58 shown in the fourth modification. By tightening the nut 53 until it reaches the steel material S, the entire screw bolt 58 can be more firmly fixed. In addition, when the nut 53 is disposed in the middle portion of the entire screw bolt 58, the catching between the first reinforcing resin layer 2 and the second reinforcing resin layer 3 can be improved. In addition, after the nut 53 is screwed to the full screw bolt 58, the nut 53 may be prevented from falling off by crushing the screw threads at both ends of the full screw bolt 58.

  9th embodiment of the steel material repair structure 1 shown to Fig.9 (a) and (b) attaches the fall prevention sheet 11 for peeling prevention with the adhesive so that the surface of the 2nd reinforcement resin layer 3 may be covered. It is. 9A and 9B, the drop-proof sheet 11 is illustrated by a one-dot chain line for convenience of explanation. For the drop-proof sheet 11, for example, glass cloth, carbon fiber, aramid fiber or the like excellent in adhesiveness with resin is used. By sticking such a drop-proof sheet 11 on the surface of the steel material repair structure 1, it is possible to suppress the first reinforcing resin layer 2 and the second reinforcing resin layer 3 from being peeled off and to improve safety. be able to.

  The present invention is not limited to the above-described embodiment, and can be applied to repair of corroded portions in various steel structures using steel materials such as sluices, buildings, marine structures, plants, etc. other than bridges, etc. Of course, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Steel material repair structure 2 1st reinforcement resin layer 3 2nd reinforcement resin layer 4 Reinforcement material 5 Displacement stop member 6 Fiber material 7 Metal material 8 Sub reinforcement material 9 Steel girder bridge 10 Truss bridge 11 Drop-off sheet 51 Insertion hole 52 Bolt 52a Expanded portion 52b Tapered portion 53 Nut 54 Stud bolt 55 Second nut 56 Single screw bolt 56a Head 57 Screw hole 58 Full screw bolt 91 Bridge girder 92 Steel 92a Web 92b Flange 93 Upper structure 94 Vertical reinforcing steel (reinforcing steel)
101 Upper chord material 102 Lower chord material 103 Gusset plate 104 Diagonal material

Claims (11)

A steel material repair structure for repairing a corroded part formed on the surface of a steel material,
A first reinforcing resin layer that fills the corroded portion and covers the outer periphery of the corroded portion;
A second reinforcing resin layer covering the entire first reinforcing resin layer;
A reinforcing material disposed between the first reinforcing resin layer and the second reinforcing resin layer and embedded in a resin agent constituting the first reinforcing resin layer and the second reinforcing resin layer;
A plurality of displacement preventing members fixed to the corroded portion and the outer periphery thereof and covered with at least the first reinforcing resin layer;
The displacement preventing member is screwed into a bolt having an enlarged diameter portion having a diameter larger than a diameter of an insertion hole drilled in the steel material, a stud bolt welded to the steel material, or a screw hole drilled in the steel material. A steel material repair structure characterized by comprising all screw bolts.   The steel material repair structure according to claim 1, wherein the bolt is a double screw bolt having the enlarged diameter portion at a central portion or a single screw bolt having the enlarged diameter portion at the base of the head.   3. The steel material repair structure according to claim 1, wherein the misalignment stopping member includes a nut screwed into the bolt, the stud bolt, or the full screw bolt.   The steel repair structure according to claim 3, wherein the nut is screwed into the inside of the reinforcing material, the outside of the reinforcing material, or the inside and outside of the reinforcing material.   The steel material repair structure according to any one of claims 1 to 4, wherein the first reinforcing resin layer and the second reinforcing resin layer are made of an epoxy resin agent.   The steel material repair structure according to claim 5, wherein a fiber material, a metal material, a ceramic material, a stone material, or a mixed material thereof is blended with the epoxy resin agent.   The steel material repair structure according to any one of claims 1 to 6, wherein the reinforcing material is a mesh, a thin steel plate, a punching metal, or a three-dimensional woven fabric.   The steel material repair structure according to any one of claims 1 to 7, further comprising a secondary reinforcing material disposed under the first reinforcing resin layer.   The said 1st reinforcement resin layer, the 2nd reinforcement resin layer, the said reinforcement material, and the said slip prevention member are arrange | positioned on both surfaces of the said steel material which has the said corrosion part, The any one of Claims 1-8 characterized by the above-mentioned. The steel material repair structure as described in one.   The steel material has a plurality of reinforcing steel materials arranged in a longitudinal direction, and the first reinforcing resin layer is formed over the entire area between the adjacent reinforcing steel materials. Item 10. The steel material repair structure according to any one of Items 9. The steel material repair structure according to any one of claims 1 to 10, wherein a fall prevention sheet is attached so as to cover the surface of the second reinforcing resin layer.