JP2011117183A - Repair method and repair structure of concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repair method of a concrete structure, which sufficiently infiltrates a repair material into the section of an object to be repaired. <P>SOLUTION: The repair method comprises a process for specifying a part 11 not to be filled with the repair material of the concrete structure 1, a process for forming grooves 2 in the part 11 not to be filled with it, a process for forming an injection hole 3 deeper than the grooves 2 in the grooves 2 and projection positions, and a process for filling the injection hole 3 and the grooves 2 with the repair material 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a concrete structure for repairing a repair target part such as a part not sufficiently filled with concrete or a part where deterioration or cracking occurs in a concrete structure such as a tunnel lining or a bridge. The present invention relates to a structure repair method and a repair structure.

  Conventionally, tunnel lining constructed with reinforced concrete or prestressed concrete, the surface of bridge slabs and piers, etc. due to material separation or lack of compaction when filling concrete, fatigue due to aging or repeated loading, etc. It is known that a repair target part requiring repair occurs (see Patent Documents 1 to 3).

  For example, Patent Document 1 discloses a repair method in which a cylindrical injection hole is provided near the surface layer of a crack generated in a column or wall surface of a concrete structure, and a repair material is injected into the crack using the injection hole. Has been.

  In Patent Document 2, a plurality of slits are provided at intervals in the repair target portion of the concrete structure, and the surface of the repair target portion is covered with a planar reinforcing material such as a fiber reinforced resin sheet, A repair method for integrating the filled reinforcing filler and the planar reinforcing material is disclosed.

  Furthermore, Patent Document 3 discloses a repair method in which a groove is provided on the surface of a concrete structure, a steel material is disposed along the groove, and the concrete structure and the steel material are integrated by an adhesive.

JP 2001-123670 A JP 2007-239283 A Japanese Patent Publication No. 48-22098

  However, if the part to be repaired is an unfilled part caused by material separation or lack of compaction when filling concrete, it will be spread in the three-dimensional direction. A filling method is generally performed.

  In the method of removing the unfilled portion, the removed surface tends to be an interface and easily becomes a weak portion in the structure, and the interface peeling due to deterioration over time is likely to occur. In addition, due to the vibration and impact of the lifting work, fine cracks are also generated in the concrete around the unfilled part, which may reduce the strength and durability.

  Then, this invention aims at providing the repair method and repair structure of a concrete structure which can fully make a repair material osmose | permeate a repair object part.

  In order to achieve the above object, a method for repairing a concrete structure according to the present invention includes a step of specifying a repair target portion of the concrete structure, a step of providing a groove in the repair target portion, and the groove. And a step of providing an injection hole deeper than the groove and a step of filling the injection hole and the groove with a repair material. Note that the order of providing the injection hole in the repair target portion and the step of providing the groove may be reversed.

  Here, it is preferable that the injection hole is formed deeper than the depth of the repair target portion. Moreover, it is preferable to form the said groove | channel in the length which crosses the said repair object part. Furthermore, a plurality of the grooves can be provided at intervals.

  In addition, the repair material can be filled after the surface of the repair target portion and the groove are covered with a coating material. Further, a tensile material directed in the longitudinal direction may be embedded in the groove.

  Further, the repair structure of a concrete structure of the present invention includes a groove provided in a surface layer of a repair target portion of the concrete structure, an injection hole formed deeper than the groove at a position projected with the groove, and the groove. And a repair material filled in the injection hole.

  Here, it can be set as the structure provided with the coating | covering material which coat | covers the surface of the said repair object part and the said groove | channel. Moreover, the structure provided with the tension material embed | buried along the longitudinal direction of the said groove | channel may be sufficient.

  In the repair method of a concrete structure of the present invention configured as described above, a groove and an injection hole deeper than the groove and communicating with the groove are provided in the repair target portion. Then, the filling material is filled in the injection hole and the groove.

  For this reason, a repair material can be penetrate | infiltrated with the breadth in the surface direction and depth direction of a repair object part.

  In addition, by forming the injection hole deeper than the depth of the repair target part, sufficient reinforcement can be performed even in the vicinity of the boundary between the repair target part and the healthy part.

  Furthermore, by forming a groove having a length that crosses the repair target part, the repair material can be permeated into every corner of the repair target part. Further, by providing a plurality of grooves, the repair material can be widely infiltrated into a repair target portion that extends in a direction intersecting with the longitudinal direction of the grooves.

  Furthermore, by covering the surface of the repair target part and the groove with the covering material, the repairing material can be repaired without leaking the surface of the concrete structure not facing upward.

  Moreover, the tensile strength of the longitudinal direction of the groove | channel of a concrete structure can be improved by burying a tensile material along a groove | channel.

It is a figure explaining the repair method of the concrete structure of embodiment of this invention, Comprising: (a) is sectional drawing, (b) is the partially broken view seen from the lower surface side of the concrete structure. It is a figure explaining the process of the repair method of the concrete structure of embodiment of this invention. It is a figure explaining the repair structure of the concrete structure of embodiment of this invention, Comprising: (a) is sectional drawing, (b) is the figure seen from the lower surface side of the concrete structure. It is a figure explaining the repair method of the concrete structure of an Example, (a) is sectional drawing, (b) is the figure seen from the lower surface side of the concrete structure. It is a figure explaining an effect confirmation test, (a) is a sectional view of a specimen, and (b) is a figure seen from the undersurface side of a specimen. It is the figure which showed the test result of the effect confirmation test, Comprising: (a) is the figure which showed the bending strength test result, (b) is the figure which showed the filling rate of the repair material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an enlarged view of the vicinity of a surface layer of a concrete structure 1 constructed of reinforced concrete such as a tunnel lining or a bridge slab or prestressed concrete. In addition, in Fig.1 (a), the surface of the concrete structure 1 is a lower surface, FIG.1 (b) is the figure which looked at the surface from right below.

  Such a concrete structure 1 may have an unfilled portion 11 due to material separation during concrete filling or insufficient compaction. In the present embodiment, the unfilled portion 11 is repaired as a repair target portion.

  The unfilled part 11 has more voids than the surrounding healthy part, and not only becomes a weak part of the structure of the concrete structure 1 but also promotes deterioration or may cause peeling. is there.

  In the repair method of the concrete structure 1 of the present embodiment, first, the range of the unfilled portion 11 is specified by visual appearance observation or nondestructive inspection (see FIG. 2A). Here, for the non-destructive inspection, an ultrasonic method or an infrared method can be applied.

  A slit-like groove 2 as shown in FIG. 1 is provided on the surface layer of the unfilled portion 11. The groove 2 is longer than the width of the unfilled portion 11 and is formed by a hand cutter, a water jet or the like so as to cross the unfilled portion 11 (see FIG. 2B).

  For example, the groove 2 is formed to have a width of 2 to 10 mm, a depth of at least 0.1 times the width, and a length of at least 10 times the width. Moreover, when the unfilled part 11 spreads in the horizontal direction as shown in FIG. 1B, for example, a plurality of grooves 2 and 2 are provided at intervals of 30 to 300 mm.

  Further, the injection hole 3 is drilled in the depth direction of the unfilled portion 11 at a position overlapping the groove 2 of the unfilled portion 11 (a position projected as the groove 2). The injection hole 3 is a hole having a diameter substantially the same as the width of the groove 2 and is formed to a position deeper than the unfilled portion 11 as shown in FIG.

  As shown in FIG. 1, when a plurality of injection holes 3, 3 are provided for one groove 2, they are provided with an interval of, for example, 30 mm or more in the longitudinal direction of the groove 2. In FIG. 1, two grooves 2, 2 parallel to the unfilled portion 11 and two injection holes 3, 3 are provided in each groove 2.

  On the other hand, the surfaces of the grooves 2 and 2 and the unfilled portion 11 are covered with the covering material 4. The covering material 4 is a sealing material that prevents leakage of the repair material 32 described later, and a sheet-like or plate-like member can be used.

  Further, if the covering material 4 is formed of a fiber reinforced resin (FRP) mixed with fibers such as carbon fiber, aramid fiber or glass fiber, a stainless plate or a steel plate, the surface of the unfilled portion 11 can be reinforced. it can.

  The covering material 4 is fixed to the opening of the groove 2 and the surface of the unfilled portion 11 with an adhesive or the like. The covering material 4 is not disposed at a position where the groove 2 and the injection holes 3 and 3 overlap.

  The repair material 32 injected from the injection hole 3 includes an injection material such as an organic type, a cement type or a polymer cement type, a cross-sectional repair material such as an organic type, a polymer cement type or a resin mortar type, or a polymer impregnated material. A permeable solidifying material such as can be used. By using a solidifying material having high permeability as the repair material 32, the repair material 32 can be sufficiently infiltrated into the voids of the unfilled portion 11.

  The repair material 32 can be injected by mounting an injector 31 as shown in FIG. The repair material 32 filled in the injection hole 3 in a pressurized state by the injector 31 spreads into the inner space of the groove 2 and penetrates into the unfilled portion 11 from the wall surface of the injection hole 3 and the groove 2. become.

  FIG. 3 is a diagram showing a configuration of a repair structure different from the above-described repair structure. In the repair structure shown in FIG. 3, four grooves 2,... Traversing the unfilled portion 11 are formed in parallel, and each groove 2 has one injection. Hole 3 is drilled.

  Further, the injection holes 3 are formed by shifting the positions so as to be in a staggered arrangement with respect to the injection holes 3 of the adjacent grooves 2. Then, the groove 2 and the injection hole 3 are filled with a repair material 32 without a gap as shown in FIG.

  Further, although not shown, the repair material 32 filled in the grooves 2... And the injection holes 3... Spreads in the depth direction and the surface direction (lateral direction) of the unfilled portion 11 and penetrates. Will do.

  Next, the method for repairing the concrete structure 1 according to the present embodiment and the operation of the repair structure will be described.

  In the repair method of the concrete structure 1 of the present embodiment configured as described above, the groove 2 and the injection hole 3 deeper than the groove 2 are provided in the unfilled portion 11. Then, the repairing material 32 is filled into the injection hole 3 and the groove 2 that are in a communicating state.

  For example, if the injection holes 3,... Are scattered in places in the unfilled portion 11, the repair material 32 only penetrates around the injection holes 3. Further, merely providing the grooves 2,... On the surface layer of the unfilled portion 11 merely reinforces the surface layer of the unfilled portion 11.

  On the other hand, in the repair method and the repair structure of the present embodiment in which the groove 2 communicated with the injection hole 3 is formed, the repair material 32 filled in the injection hole 3 spreads quickly into the groove 2, Since the unfilled portion 11 penetrates from both the wall surfaces of the groove 2 and the injection hole 3, the repair material 32 can be permeated with a spread in the surface direction and the depth direction of the unfilled portion 11.

  And the repair structure of the concrete structure 1 with which the healthy part and the unfilled part 11 were integrated via the repair material 32 is formed by fully infiltrating the repair material 32 into the unfilled part 11, and sufficient Bending strength can be ensured.

  Further, since the unfilled portion 11 is not removed, there is no possibility of causing a crack in the healthy portion around the unfilled portion 11 due to vibration or impact of the lifting work and reducing the strength or durability. Furthermore, since it is difficult to form a suspended surface that tends to be a weak part in the structure, interface peeling or the like does not occur.

  Moreover, the concrete structure which does not face upwards, such as the ceiling and side wall of a tunnel lining, the lower surface of the bridge slab, and the side surface of a bridge pier by covering the surface of the unfilled part 11 and the groove | channel 2 with the coating | covering material 4. The surface of 1 can be filled without causing the repair material 32 to leak out.

  Furthermore, the repair material 32 can be penetrated to every corner of the unfilled portion 11 by forming the groove 2 having a length that crosses the unfilled portion 11. Further, by providing the plurality of grooves 2,..., The repair material 32 can be widely permeated into the unfilled portion 11 spreading in a planar shape in a direction orthogonal to the longitudinal direction of the groove 2.

  Then, by forming the injection hole 3 deeper than the unfilled portion 11, the repair material 32 can sufficiently penetrate and be firmly bonded to the vicinity of the boundary between the unfilled portion 11 and the healthy portion.

  Hereinafter, an example of a mode different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the repair method and repair structure of the concrete structure 1 described in this embodiment, the tensile material 5 is disposed along the longitudinal direction of the groove 2.

  As the tensile material 5, a steel material such as stainless steel or a fiber reinforcing material such as steel fiber or organic fiber formed into a length similar to that of the groove 2 can be used. When the tension member 5 is installed in the groove 2, as shown in FIG. 4A, the tension member 5 is disposed in the center of the groove 2 using a fixture 51 such as a spacer or a suspension member.

  Then, when the repair material 32 is filled in the groove 2 in which the tensile material 5 is disposed, the repair material 32 is filled around the tensile material 5, and the concrete structure 1 and the tensile material 5 are separated by the repair material 32. Integrated.

  In this way, by burying the tensile material 5 that becomes tensile resistance along the longitudinal direction of the groove 2, the tensile strength in the longitudinal direction of the groove 2 on the surface of the concrete structure 1 can be increased.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, the test method which confirmed the effect of the repair method and repair structure of concrete structure 1 of above-described embodiment and Example 1 is demonstrated.

  In Example 2, as shown in FIG. 5A, a loading test was performed by loading the loads P and P at two points on the square columnar specimen 6 installed on the fulcrums 61 and 61. . Here, five types of specimens 6 shown in Table 1 were produced, and the test was performed on each specimen.

   That is, the specimen having the name “sound” is a specimen having no unfilled portion 11 such as material separation, and a “no repair” specimen that is not repaired even though there is the unfilled portion 11 has been repaired. If the strength is comparable to that of a “sound” specimen, it can be said that there was a repair effect.

  In addition, a specimen named “injection hole only” was manufactured in order to confirm the effect of a conventional repair method.

  The specimen named “groove + injection hole” corresponds to the repair structure described in the above embodiment (Invention 1). Further, the specimen having the name “groove + injection hole + tensile material” has a repair structure in which the groove 2 and the injection hole 3 described in the first embodiment are provided, and the tensile material 5 is disposed in the groove 2. (Refer to the present invention 2, FIGS. 6 (a) and 6 (b)).

  Here, the groove 2 had a width of 4.5 mm to 6.0 mm up to a depth of 20 mm, and a depth of 2.0 mm after that. The interval between the two parallel grooves 2 and 2 was 50 mm. Further, the injection hole 3 has a diameter of 10 mm and a depth of 100 mm. The tensile material 5 was a stainless steel (SUS) rod having a diameter of 3 mm. Moreover, an epoxy resin was used for the repair material 32.

  FIG. 6A is a bar graph showing the bending strength of each specimen obtained by the loading test. From this result, the specimens of “no repair” and “only the injection hole” are significantly lower than the bending strength of the “sound” specimen, but “groove + injection hole” of the present invention 1 is “sound”. The bending strength of the same degree was shown, and “groove + injection hole + tensile material” of Invention 2 showed bending strength larger than “sound”.

  On the other hand, in FIG. 6B, the filling rate of the epoxy resin as the repair material 32 is shown by a bar graph. As a result, compared with the conventional method in which only the injection hole 3 is provided and the unfilled portion 11 is filled, the configuration of the present invention 1 and 2 in which the groove 2 is provided has a high filling rate of the repair material 32 and the unfilled portion. 11 was confirmed to be able to penetrate the repair material 32 widely.

  The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and examples, and the gist of the present invention is not deviated. Design changes are included in the present invention.

  For example, in the said embodiment and Example, although the method of repairing the unfilled part 11 produced by the material separation of concrete, lack of compaction, etc. as a repair object part was demonstrated, it is not limited to this, A crack is It is good also considering the part which has generate | occur | produced or the degradation part by aged deterioration, fatigue, etc. as a repair object part.

  Moreover, in the said embodiment and Example, although the groove | channel 2 was formed in linear form, it is not limited to this, A groove | channel may be curvilinear. Furthermore, the groove may not be continuous in the longitudinal direction, and may be formed intermittently.

  Moreover, although the said embodiment and Example demonstrated the case where the some groove | channel 2, ... was provided in parallel, it is not limited to this, A some groove | channel according to the shape of a repair object part. May be a groove in a form that intersects or a part of the unfilled part 11.

  Furthermore, in the said embodiment and Example, although the injection hole 3 drilled straight in the direction orthogonal to the surface of the concrete structure 1, it is not limited to this, The surface of the concrete structure 1 is not limited to this. It is also possible to perforate diagonally.

  Moreover, in the said embodiment, although the surface of the groove | channel 2 and the unfilling part 11 was coat | covered with the coating | covering material 4, it is not limited to this, When the surface which repairs the concrete structure 1 has faced upwards Can also omit the covering material 4.

  Further, in the above embodiment, the order in which the injection hole 3 is formed after the groove 2 is provided has been described. However, the present invention is not limited to this, and the step of providing the groove is performed after the step of providing the injection hole. The order may be changed.

1 Concrete structure 11 Unfilled part (repair target part)
2 Groove 3 Injection hole 32 Repair material 4 Cover material 5 Tensile material

Claims (10)

Identifying the repair target part of the concrete structure;
Providing a groove in the repair target part;
Providing an injection hole deeper than the groove at a position projected with the groove;
A method of repairing a concrete structure, comprising a step of filling the injection hole and the groove with a repair material. Identifying the repair target part of the concrete structure;
Providing an injection hole for the repair target part;
Providing a groove shallower than the injection hole at a position projected with the injection hole;
A method of repairing a concrete structure, comprising a step of filling the injection hole and the groove with a repair material.   The method for repairing a concrete structure according to claim 1 or 2, wherein the injection hole is formed deeper than a depth of the repair target portion.   The method for repairing a concrete structure according to any one of claims 1 to 3, wherein the groove is formed to have a length that crosses the repair target portion.   The method for repairing a concrete structure according to any one of claims 1 to 4, wherein a plurality of the grooves are provided at intervals.   The method for repairing a concrete structure according to any one of claims 1 to 5, wherein a repair material is filled after the surface of the repair target portion and the groove are covered with a coating material.   The method for repairing a concrete structure according to any one of claims 1 to 6, wherein a tensile material oriented in the longitudinal direction is embedded in the groove. A groove provided in the surface layer of the repair target part of the concrete structure;
An injection hole formed deeper than the groove at a position projected with the groove;
A repair structure for a concrete structure, comprising a repair material filled in the groove and the injection hole.   The repair structure for a concrete structure according to claim 8, further comprising a covering material that covers a surface of the repair target portion and the groove.   The repair structure for a concrete structure according to claim 8 or 9, further comprising a tension member embedded along the longitudinal direction of the groove.

Images