JP2017128860A - Reinforcing construction method and reinforcement structure of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing construction method and a reinforcement structure of a concrete structure that eliminate the need for a step of forming a groove as a resin introduction passage by using a tool including a sander.SOLUTION: A lattice member 4 for reinforcement in which a first reinforcement 4a and a second reinforcement 4b intersecting the first reinforcement are on the same plane at least on a first surface side is disposed to face the first surface side on the surface of an existing floor slab 1. An anchor 6 for injection with a rod part 6b in which an injection hole 6g for epoxy resin 9 is formed to the tip is fitted to an anchor fitting hole 1b and the anchor fitting hole 1b larger than the outer diameter of the rod part 6b is drilled at a position adjacent to a net-like crossing part of the lattice member 4 for reinforcement in the floor slab 1. The rod part 6b of the anchor 6 for injection is inserted in the anchor fitting hole 1b, and the lattice member 4 for reinforcement is coated with a coating layer 7 and the epoxy resin 9 is injected into the injection hole 6g in the anchor 6 for injection from the outside.SELECTED DRAWING: Figure 8

Description

  The present invention relates to reinforcement of concrete structures such as bridges, for example, and in particular to repair bridge floor slabs and wall bodies that have cracked, and to reinforce existing structures by adding new reinforcing bars. And a reinforcing structure.

  A road bridge constructed with a concrete structure is repeatedly subjected to a dynamic load caused by the passage of vehicles, and therefore the load on the bridge slab is considerably large among the main members of the road bridge. And if the strength of the bridge itself is excessive, the impact load is large, or if the service life is greatly exceeded, a crack will occur on the bottom surface of the slab, and this crack will gradually run vertically and horizontally on the bottom surface. As a result, it becomes finer and the concrete is peeled off.

  The occurrence of such cracks causes corrosion and breakage of the reinforcing bars in the concrete. Therefore, in normal cases, it is preferable to repair the floor slab at the initial stage where the cracks have occurred. Conventionally, as the repair work of this floor slab, a resin injection method in which epoxy resin or the like is injected into the crack, and a cross-section repair method in which a cavity portion or a concrete peeling portion generated in the floor slab is repaired with cement mortar are performed. . However, most of these methods are mainly aimed at repairing damaged parts and are effective in preventing the progress of corrosion of reinforcing bars, etc., but in the construction to increase the strength of the structure itself. Can not respond.

  On the other hand, for example, Patent Document 1 discloses a reinforcement construction method that can reinforce an existing concrete structure including a bridge by newly constructing a reinforcing bar. In this reinforcing construction method, as shown in FIG. 9, a mesh reinforcing bar 104 in which vertical and horizontal reinforcing bars 104 a and 104 b are integrated in advance by welding is fixed and held on the lower surface of the floor slab 101 by an anchor pin 105. A coating layer is constructed with mortar resin or the like after the rebar 104 is constructed.

  The conventional reinforcement construction method will be described in detail. First, as shown in FIG. 10A, a tool such as a sander is arranged on the bottom surface of the floor slab 101 in the arrangement direction of the rebars 104a and 104b of the rebar 104 and in a random direction. The groove 101a is formed using Next, as shown in FIG. 11, after fixing the rebar 104 to the anchor hole 101b formed on the lower surface of the floor slab 101 using the anchor pin 105, the portion where the injection hole 105d of the anchor pin 105 is opened is removed. It seals with the possible sealing material 105d-1, and sprays the coating material 106a with a spraying apparatus, and covers the groove | channel 101a (refer FIG.10 (b)).

  Thereafter, an intermediate coating material is applied using a trowel, and the rebar 104 is embedded. At this time, the head 105a of the anchor pin 105 is not buried. And after application | coating of an intermediate coating material, the sealing material 105d-1 is extracted from the injection hole 105d, and an epoxy resin is inject | poured from the outside. The injected epoxy resin flows into the groove 101a carved on the lower surface of the floor slab 101 and penetrates into the cracks, and the gap between the lower surface of the floor slab 101 not coated with the coating material and the reinforcing bar 104b. And is distributed over a wide area of almost the entire floor slab 101.

Japanese Patent No. 3582971

  By the way, the rebar 104 used in the above-described conventional reinforcement construction method is formed by arranging the reinforcing bars 104a and 104b vertically and horizontally and fixing the intersecting portions by welding or the like. In this state, the reinforcing bars 104a and 104b overlap each other. Therefore, among the reinforcing bars 104a and 104b of the mesh reinforcing bar 104, the gap between the reinforcing bar 104b disposed on the lower surface side of the floor slab 104 and the lower surface of the floor slab 101 is not blocked by the spray of the coating material, and the epoxy resin flows. However, the gap between the reinforcing bar 104a intersecting with the reinforcing bar 104b and the lower surface of the floor slab 101 is blocked by spraying the coating material. Therefore, in this reinforcing construction method, the groove 101a is formed on the bottom surface of the floor slab 101 with a tool such as a sander in the arrangement direction of the rebars 104a and 104b of the mesh reinforcing bar 104 and in a random direction, thereby introducing the epoxy resin introduction path. It is necessary to ensure.

  An object of this invention is to provide the reinforcement construction method and reinforcement structure of a concrete structure which made the process of forming the groove | channel as a resin introduction path unnecessary using tools, such as a sander.

  The method for reinforcing a concrete structure according to the present invention is a reinforcing lattice material in which a net-like intersection is formed by a first direction portion and a second direction portion intersecting with the first direction portion, and the first direction portion and the second direction portion are A reinforcing grid member on the same plane at least on the first surface side is disposed with the first surface side facing the surface of an existing concrete structure, and a rod portion in which a synthetic resin injection hole is formed to the tip is provided. An anchor attachment hole for attaching an injection anchor having an anchor attachment hole larger than the outer diameter of the rod portion at a position adjacent to a mesh-like intersection of a reinforcing lattice material for a concrete structure, for injection Insert the anchor rod into the anchor mounting hole, cover the reinforcing grid with a coating layer, and inject synthetic resin into the injection hole of the injection anchor from the outside. Extending from the anchor mounting hole through the gap between the first direction portion and the second direction portion of the reinforcing grid material and the surface of the concrete structure, and between the surface of the concrete structure and the covering layer. Features.

  According to the present invention, the first direction portion and the second direction portion of the reinforcing grid material are on the same plane at least on the first surface side arranged toward the surface of the existing concrete structure. A gap between the first direction portion and the second direction portion of the reinforcing lattice material and the surface of the concrete structure is secured for the synthetic resin injected from the outside into the injection hole of the anchor. Therefore, according to the present invention, the injected synthetic resin can be reinforced from the anchor mounting hole to the reinforcing grid without forming a groove as a resin introduction path using a tool such as a sander on the surface of the concrete structure as in the prior art. Through the gap between the first direction portion and the second direction portion of the material and the surface of the concrete structure, it is possible to spread the entire surface between the surface of the concrete structure and the covering layer.

  According to the present invention, without forming a groove as a resin introduction path using a tool such as a sander on the surface of a concrete structure, the covering layer covering the reinforcing lattice material, the injection hole of the injection anchor, the anchor Synthetic resin filled in the mounting hole and the gap between the first direction portion and the second direction portion of the reinforcing lattice material and the surface of the concrete structure over the entire area between the surface of the concrete structure and the covering layer A reinforcing structure of a concrete structure including

It is the schematic which shows the example which reinforced the floor slab of the bridge by the reinforcement construction method of the concrete structure in embodiment of this invention. It is the II-II arrow directional view of FIG. 1 which shows arrangement | positioning of the anchor for fixation and the anchor for injection | pouring. It is a perspective view of the grid material for reinforcement. It is the IV-IV sectional view taken on the line of FIG. It is a figure which shows the detail of the anchor for fixation, Comprising: (a) is a top view, (b) is a partially notched front view, (c) is a bottom view. It is a figure which shows the detail of the anchor for injection | pouring, Comprising: (a) is a top view, (b) is a partially notched front view, (c) is a bottom view. It is principal part sectional drawing which shows the state which formed the coating layer, after screwing the anchor for fixation in an anchor attachment hole and fixing a reinforcing bar. It is principal part sectional drawing which shows the flow of resin when an epoxy resin is inject | poured from the injection hole of the injection anchor attached to the anchor attachment hole. It is a bottom view of the floor slab which shows arrangement | positioning of the anchor pin in the reinforcement construction method of the conventional concrete structure. It is the construction example of the groove | channel carved into the bottom face of a floor slab in the reinforcement construction method of the conventional concrete structure, (a) is the schematic when a floor slab is seen from diagonally downward, (b) shows the shape of a groove | channel. It is sectional drawing. It is principal part sectional drawing which shows the state which fixed the reinforcing bar with the anchor pin in the reinforcement construction method of the conventional concrete structure.

  FIG. 1 is a schematic view showing an example in which a bridge floor slab is reinforced by a concrete structure reinforcement construction method according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the arrangement of fixing anchors and injection anchors in FIG. FIG. 3 is a perspective view of the reinforcing lattice material, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  In the concrete structure shown in FIG. 1, a bridge floor slab 1 is supported by a bridge girder 3. Reinforcing bars are arranged in a lattice pattern inside the floor slab 1. Moreover, the ground cover 2 is integrally formed in the both ends of the floor width direction of the floor slab 1, respectively. The floor slab 1 is an existing one, and it is assumed that a crack is generated on the lower surface of the floor slab by repeatedly receiving a dynamic load from the passing vehicle V. In the method for reinforcing a concrete structure according to this embodiment, the reinforcing grid member 4 shown in FIG. 2 is fixedly held by fixing anchors 5 in order to reinforce the cracked slab 1. The fixing anchor 5 is screwed into an anchor mounting hole 1a (see FIG. 7) formed in the floor slab 1 so as to be adjacent to the intersecting portion 4c of the reinforcing lattice material 4.

  As shown in FIG. 3, the reinforcing grid member 4 includes a first reinforcing bar 4 a that forms a first direction portion extending in the first direction X <b> 1 and a second direction portion that extends in a second direction X <b> 2 that intersects the first reinforcing bar 4 a. A net-like intersection 4c is formed by two reinforcing bars 4b. In the present embodiment, the reinforcing lattice member 4 is formed by arranging a deformed steel bar as the plurality of first reinforcing bars 4a and a deformed steel bar as the plurality of second reinforcing bars 4b so as to be orthogonal to each other, and press-molding while heating. Use an integrated one. Note that round steel may be used as the first reinforcing bar 4a and the second reinforcing bar 4b. In the present embodiment, the reinforcing lattice material 4 is made of a hot dip galvanized material to improve durability.

  As shown in FIG. 4, the reinforcing grid member 4 has upper surfaces of the first reinforcing bars 4 a and the second reinforcing bars 4 b (surfaces arranged toward the lower surface of the floor slab 1. In the present specification, they are referred to as “first surfaces”. .) Z1 and the lower surface (the surface opposite to the first surface, referred to as “second surface” in this specification) Z2 are on the same plane. Therefore, the 1st reinforcing bar 4a and the 2nd reinforcing bar 4b do not overlap up and down in the crossing part 4c, and the thickness of the reinforcement grid | lattice material 4 whole can be made into the thickness of the 1st reinforcing bar 4a or the 2nd reinforcing bar 4b. In addition, the thickness of the 1st reinforcing bar 4a and the thickness of the 2nd reinforcing bar 4b do not need to be the same, and the 1st surface Z1 side should just be on the same plane. In the present embodiment, the first direction X1 and the second direction X2 are orthogonal to each other, but need not be orthogonal.

  FIGS. 5A and 5B are diagrams showing details of the anchor 5 for fixation, wherein FIG. 5A is a plan view, FIG. 5B is a partially cutaway front view, and FIG. 5C is a bottom view. The fixing anchor 5 has a lower end formed with a head portion 5a whose end surface is a gentle arcuate surface, and a rod portion 5b formed from the head portion 5a toward the upper end. The rod portion 5b is formed with a taper portion 5c having an outer shape tapered toward the upper end side with respect to the head portion 5a, that is, in the direction of screwing into the anchor attachment hole 1a. Moreover, the hexagonal hole 5d as a polygonal cross-sectional hole for inserting and rotating a rotary tool is provided in the head part 5a side.

  Further, two threads 5e and 5f are formed on the outer peripheral surface of the rod portion 5b on the tip side of the taper portion 5c. The screw thread 5e is a triangular screw having a triangular cross-sectional shape. The thread 5e acts as a cone cut into the inner surface of the anchor mounting hole 1a (hereinafter, this thread 5e is referred to as a “cone thread”). The screw thread 5f is a trapezoidal screw or a square screw formed with a height lower than that of the screw thread 5e. The thread 5f acts as a guide during screwing (hereinafter, the thread 5f is referred to as “guide thread”).

  The anchor mounting hole 1a into which the fixing anchor 5 is screwed is a corner where the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 intersect in a cross shape, and the first reinforcing bar 4a and It is formed in the position where the peripheral surface of the rod part 5b contacts the 2nd reinforcing bar 4b simultaneously. When the fixing anchor 5 is screwed into the anchor mounting hole 1a, the taper portion 5c comes into contact with the peripheral surfaces of the first reinforcing bar 4a and the second reinforcing bar 4b instead of the rod portion 5b, and the fixing anchor 5 is attached. When viewed from the center, the outer radius of the taper portion 5c increases. Therefore, the anchor 5 for fixation comes to push the 1st reinforcing bar 4a and the 2nd reinforcing bar 4b in the arrow direction in FIG. 2, and tensile force acts on these crossing parts 4c.

  In this way, by providing the fixing anchor 5 with the tapered portion 5c, if the position of the fixing anchor 5 is appropriately set with respect to the reinforcing lattice material 4 shown in FIG. 2, the reinforcing anchor 5 as shown by the arrow in the figure. A uniform tensile force can be applied from the center of the lattice material 4 to a direction having an angle of 45 ° with the lattice. Therefore, when the floor slab 1 is constructed as shown in FIG. 1, even if the floor slab 1 is bent and deformed, the reinforcing lattice material 4 follows the bending deformation, and the fixing anchor 5 and the reinforcing lattice It is possible to prevent a gap from being generated with the material 4.

  Moreover, in the concrete structure reinforcement construction method in this embodiment, the anchor 6 for injecting the synthetic resin is formed on the floor slab 1 so as to be adjacent to the intersecting portion 4c of the reinforcing lattice material 4. It attaches to the attachment hole 1b. The anchor attachment hole 1b is provided at a position different from the anchor attachment hole 1a to which the fixing anchor 5 is attached.

  FIG. 6 is a diagram showing details of the injection anchor 6, wherein (a) is a plan view, (b) is a partially cutaway front view, and (c) is a bottom view. The injection anchor 6 is malleably formed with a head portion 6a similar to the above-described fixing anchor 5, and a rod portion 6b is formed from the head portion 6a toward the upper end. The rod portion 6b is formed with a taper portion 6c whose outer shape is tapered in the direction of being inserted into the anchor attachment hole 1b between the head portion 6a and the upper end side.

  On the head portion 6a side, a female screw portion 6e is formed as an injection device connecting portion for connecting the injection device 8 made of synthetic resin. Further, an uneven surface 6f is formed on the outer peripheral surface on the distal end side of the rod portion 6b for increasing the adhesion force with the synthetic resin. Furthermore, the rod portion 6b of the injection anchor 6 is formed with an injection hole 6g having a uniform inner diameter that penetrates the female screw portion 6e and the head portion 6a in the axial direction. And the slit 6h which cut | disconnected the surrounding wall part of the injection hole 6g in the radial direction is formed in the front end side of the rod part 6b.

  The anchor mounting hole 1b to which such an injection anchor 6 is mounted is a corner where the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 intersect in a cross shape, and the first reinforcing bar 4a and It is formed in the position where the peripheral surface of the rod part 6b contacts the 2nd reinforcing bar 4b simultaneously. The injection anchor 6 inserted into the anchor mounting hole 1b has an anchor mounting hole in which the taper portion 6c has a support pressure between the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 and the inner surface of the anchor mounting hole 1b. 1b.

  Next, a concrete construction reinforcement method according to this embodiment will be described. FIG. 7 is a cross-sectional view of a main part showing a state in which a covering layer is formed after fixing a reinforcing bar by screwing a fixing anchor into an anchor mounting hole, and FIG. 8 shows an epoxy resin from an injection hole of the injection anchor attached to the anchor mounting hole. It is principal part sectional drawing which shows the flow of resin when inject | pouring. In addition, in the reinforcement construction method of the concrete structure in this embodiment, the construction which engraves a groove | channel like the conventional method is not performed.

  In the concrete construction reinforcing method according to the present embodiment, first, the reinforcing grid member 4 is placed along the lower surface of the floor slab 1 to temporarily determine the position thereof, so that both the first reinforcing bar 4a and the second reinforcing bar 4b are used. The positions where the rod portions 5b, 6b of the anchor for anchor 5 and the anchor for injection 6 can contact each other are marked on the lower surface of the floor slab 1. The number of fixing anchors 5 and injection anchors 6 may be appropriately selected according to the size of the reinforcing lattice material 4.

  After marking the fixing anchor 5 and the injection anchor 6 at the installation position, the reinforcing grid material 4 is separated from the floor slab 1 or is temporarily determined by a holder, and the marking mark is used as a mark as a pilot hole. The anchor mounting holes 1a and 1b are drilled with a drill. The inner diameter of the anchor mounting hole 1a is larger than the outer shape of the rod portion 5b of the fixing anchor 5 and smaller than the conical screw thread 5e, and when the fixing anchor 5 is screwed, the conical thread thread 5e is fixed to the anchor mounting hole 1a. Cut into the inner surface. On the other hand, the inner diameter of the anchor mounting hole 1b is larger than the outer shape of the rod portion 6b of the anchor 6 for injection, and does not clog the injected resin. The depth of the anchor mounting hole 1b is set to a length that does not block the injection hole 6g opened at the tip of the injection anchor 6 when the anchor 6 for injection is fully inserted.

  When all the drilling operations of the anchor mounting holes 1a and 1b are completed, the position of the reinforcing lattice material 4 is accurately aligned again, and the intersection 4c and the anchor mounting hole 1a where the first reinforcing bar 4a and the second reinforcing bar 4b intersect with each other are formed. The positional relationship between them is adjusted, and temporarily fixed along the lower surface of the floor slab 1 again. Then, the distal end portion of the rod portion 5b of the fixing anchor 5 is applied to the entrance of the anchor mounting hole 1a, and a rotary tool is fitted into the hexagonal hole 5d to be screwed into the floor slab 1 while rotating the fixing anchor 5. At this time, the conical thread 5e of the anchor for anchor 5 advances while being cut into the inner surface of the anchor mounting hole 1a, and the guide thread 5f abuts against the inner surface of the anchor mounting hole 1a, so that the posture of the anchor for anchor 5 is The axis is held so as to coincide with the axis of the anchor mounting hole 1a.

  When the fixing anchor 5 is rotated and screwed into the anchor mounting hole 1a of the floor slab 1, the taper portion 5c hits the peripheral surfaces of the first reinforcing bar 4a and the second reinforcing bar 4b, and the second direction in the direction of the arrow in FIG. The first reinforcing bar 4a and the second reinforcing bar 4b are pushed, and a tensile force acts on these intersecting portions 4c. That is, by attaching the anchoring anchor 5 so that the tensile force acting on the intersecting portion 4c spreads outward from the center of the reinforcing grid member 4, the head portion 5a becomes the first reinforcing bar as shown in FIG. When the screwing is completed by abutting against the 4a and the second rebar 4b, the reinforcing lattice material 4 is fixed to the lower surface of the floor slab 1 in a state where tension is applied to the whole.

  After the fixing anchor 5 is screwed into the anchor mounting hole 1a as described above, the injection anchor 6 is inserted into the anchor mounting hole 1b and attached. The injection anchor 6 inserted into the anchor attachment hole 1b has an anchor attachment hole 1b whose taper portion 6c has a support pressure between the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 and the inner surface of the anchor attachment hole 1b. Retained.

  Thereafter, sealing is performed by screwing a bolt or the like into a portion where the injection hole 6g of the injection anchor 6 is open, that is, the female screw portion 6e. And the coating layer 7 shown with a dashed-dotted line in FIG. The coating layer 7 is composed of a primer, an intermediate and a top coat, and first, the primer is sprayed by a spraying device. At this time, since the primer is operated so as to be sprayed from directly under the floor slab 1 by the spraying device, the primer does not completely wrap around between the first reinforcing bar 4a and the second reinforcing bar 4b and the lower surface of the floor slab 1, A gap 1c is formed.

  At this time, since the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 in the present embodiment are on the same plane at least on the first surface Z1 side arranged toward the lower surface of the floor slab 1, Between the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing grid member 4 and the lower surface of the floor slab 1, an epoxy resin 9 injected from the outside into the injection hole 6g of the injection anchor 6 as will be described later. A gap 1c for inflow is formed. That is, since the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 in the present embodiment are on the same plane on the first surface Z1 side facing the lower surface of the floor slab 1, The gap 1c is narrow in the vicinity of the contact portion between the outer peripheral surface of the first reinforcing bar 4a and the second reinforcing bar 4b and the floor slab 1, and the undercoat cannot reach every corner, so that the gap 1c is always formed.

  After the application of the undercoat material, the intermediate coat material is applied. The intermediate coating material is applied by troweling or spraying. At this time, the intermediate coating material covers the head portion and ensures a predetermined thickness. Then, after curing the intermediate coating material, a bolt or the like is extracted from the female screw portion 6e, the injection device 8 is screwed into the female screw portion 6e as shown in FIG. 8, and, for example, an epoxy resin 9 is injected from the injection device 8 as a synthetic resin. After filling with the epoxy resin 9, the injection device 8 is removed from the female screw portion 6 e, and the top coat material is applied to the surface of the intermediate coating material with a roller, and the coating layer indicated by the one-dot chain line in FIG. 7 is formed.

  The epoxy resin 9 supplied to the injection hole 6g of the injection anchor 6 flows out from the upper end of the injection hole 6g and the slit 6h and is sent out into the anchor attachment hole 1b. As a result, the air quickly flows into the gap 1c. The epoxy resin 9 that has come out of the anchor mounting hole 1b is poured into the cracks on the lower surface of the floor slab 1 from the intersections of the cracks with the first reinforcing bar 4a and the second reinforcing bar 4b, and the lower surface of the floor slab 1 It flows so as to fill the gap 1c between the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4, and reaches the entire area between the lower surface of the floor slab 1 and the primer (covering layer 7).

  That is, although the crack is covered with the primer, the epoxy resin 9 filled in the gap 1c between the first reinforcing bar 4a and the second reinforcing bar 4b of the reinforcing lattice material 4 flows due to the injection pressure. It penetrates into the cracks. Further, at the portion where the first reinforcing bar 4a and the second reinforcing bar 4b directly intersect with the crack, the epoxy resin 9 supplied along the gap 1c directly enters the crack. That is, even if cracks are generated indefinitely, an epoxy is used by utilizing this gap 1c without forming a groove as a resin introduction path on the floor slab 1 using a tool such as a sander as in the prior art. Resin 9 can be filled into the cracks.

  Thus, the epoxy resin 9 injected from the injection hole 6g of the injection anchor 6 does not stop only in the anchor mounting hole 1b, but can be distributed over a substantially wide area of the floor slab 1. Accordingly, when a curing period is set after injecting an appropriate amount of the epoxy resin 9, the rod portion 6b of the injection anchor 6 is firmly fixed in the anchor mounting hole 1b by the curing of the epoxy resin 9.

  In addition, since the solidified epoxy resin 9 remains between the lower surface of the floor slab 1 and the reinforcing grid material 4, the lower surface of the floor slab 1 can be firmly covered, and is completely integrated with the thickened portion for repair and reinforcement. Demonstrate the effect. Further, since the epoxy resin 9 is also filled with cracks, the growth can be suppressed even when subjected to an impact load or the like, and not only the repair but also the reinforcing strength can be sufficiently increased.

  As described above, in the method for reinforcing a concrete structure according to this embodiment, it is not necessary to form a groove as a resin introduction path using a tool such as a sander on the surface of the concrete structure. Further, in the reinforcing grid member 4, the first reinforcing bar 4a and the second reinforcing bar 4b do not overlap each other at the intersection 4c, and the total thickness of the reinforcing grid member 4 is the thickness of the first reinforcing bar 4a or the second reinforcing bar 4b. Therefore, the covering layer 7 covering this is thinned, and the workability and economy are improved.

  In the above example, the bridge slab is reinforced, but various concrete structures may be used instead.

  The concrete structure reinforcing method and the reinforcing structure according to the present invention include, for example, reinforcement of a concrete structure such as a bridge, in particular, repair of a cracked bridge floor slab and a wall body, and a new reinforcement for an existing structure. It is useful as a method and a structure for reinforcement by additional construction.

DESCRIPTION OF SYMBOLS 1 Floor slab 1a, 1b Anchor attachment hole 1c Crevice 2 Ground cover 3 Bridge girder 4 Reinforcement lattice material 4a 1st reinforcing bar 4b 2nd reinforcing bar 4c Intersection 5 Fixing anchor 5a Head part 5b Rod part 5c Taper part 5d Hexagonal hole 5e Cone Screw thread 5f Guide screw thread 6 Injection anchor 6a Head part 6b Rod part 6c Taper part 6e Female thread part 6f Concavity and convexity 6g Injection hole 6h Slit 7 Covering layer 8 Injection tool 9 Epoxy resin

Claims (3)

A reinforcing grid member in which a net-like intersection is formed by a first direction portion and a second direction portion intersecting with the first direction portion, and the first direction portion and the second direction portion are at least on the same plane on the first surface side. Arranging a certain reinforcing grid material with the first surface side facing the surface of an existing concrete structure;
An anchor mounting hole for mounting an injection anchor having a rod portion in which a synthetic resin injection hole is formed up to the tip, and the anchor mounting hole larger than the outer diameter of the rod portion is used as the reinforcing lattice material for the concrete structure Drilling at a position adjacent to the mesh-like intersection of
Inserting the rod portion of the anchor for injection into the anchor mounting hole;
Covering the reinforcing grid material with a coating layer;
Synthetic resin is injected into the injection hole of the injection anchor from the outside, and the synthetic resin is injected from the anchor mounting hole into the first direction portion and the second direction portion of the reinforcing lattice material and the surface of the concrete structure. A method for reinforcing a concrete structure, comprising spreading the entire surface between the surface of the concrete structure and the coating layer through a gap.   The method of reinforcing a concrete structure according to claim 1, wherein the reinforcing lattice material is composed of a first reinforcing bar that constitutes the first direction portion and a second reinforcing bar that constitutes the second direction portion. . A reinforcing grid member in which a net-like intersection is formed by a first direction portion and a second direction portion intersecting with the first direction portion, and the first direction portion and the second direction portion are on the same plane at least on the first surface side. There is a reinforcing lattice material arranged with the first surface side facing the surface of an existing concrete structure,
An injection anchor having a rod portion in which a synthetic resin injection hole is formed up to the tip, outside the rod portion drilled at a position adjacent to the mesh-like intersection of the reinforcing lattice material of the concrete structure An injection anchor inserted into an anchor mounting hole larger than the diameter;
A covering layer covering the reinforcing grid material;
The first direction portion and the second direction portion of the reinforcing grid member over the injection hole of the injection anchor, the anchor mounting hole, and the entire surface between the surface of the concrete structure and the covering layer. And a reinforcing structure of a concrete structure including a synthetic resin filled in a gap between the surface of the concrete structure and the surface of the concrete structure.

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