JP4808062B2 - Reinforcement structure of existing concrete structures - Google Patents

Description

The present invention relates to a reinforcing structure of the existing concrete structures, in particular, it relates to a reinforcing structure of the existing concrete structure capable of obtaining a desired reinforcing effect in a relatively short period of time.

  In the construction field, from the viewpoint of protecting the global environment, the existing structure is being reinforced and repaired instead of conventional scrap and build, and development and research on such reinforcement and repair technology are earnestly conducted by each company in the construction field. It is going on.

  Among the existing structures, as a conventional technique related to a repair method for an existing reinforced concrete structure, a technique disclosed in Patent Document 1 which has been proposed as a result of earnest research by the applicant can be cited.

  This repair method will be described with reference to FIG. 7. In a concrete structure comprising a steel plate S, a track concrete disc C1, a base concrete disc C2, and a main frame concrete disc C3, a book having sufficient strength from the upper surface of the steel plate S. A repair hole a extending to the structural concrete board C3 is opened, an injection hole b different from the repair hole a is opened, both holes are connected by a connection hole d, and a reinforcing material e is inserted into the repair hole a. In this method, the injection material f is supplied to the repair hole a through the injection hole b (X direction).

  Examples of the existing concrete structure shown in FIG. 7 include a monorail track having a surface covered with a steel plate and composed of a plurality of concrete boards. In such a structure, voids and cracks are likely to occur between the base concrete and the raceway concrete, or between the raceway concrete and the steel plate due to deterioration over time, repeated loads, or the like. A simple reinforcing structure that can withstand the static load, dynamic load, and impact load of the monorail cannot be formed by simply boring and injecting / curing chemical injection into the voids and cracks.

Japanese Examined Patent Publication No. 2-61564

  According to the repair method disclosed in Patent Document 1, in addition to the repair of gaps and cracks between layers, a concrete structure having a laminated structure and a concrete structure in which a steel plate or the like is fixed on the concrete surface, It can be reinforced as a structure having high strength (shear strength, compression strength, bending strength, etc.). However, it cannot be denied that it is necessary to open one injection hole corresponding to one repair hole in the repair work, and that the work for connecting the repair hole and the injection hole takes time. When the construction object is the above-described track, the extension becomes long and the number of repair points becomes large, so the construction takes a long time. Furthermore, in track construction, construction per day is limited due to restrictions on construction time, resulting in a long construction period.

The present invention has been made in view of the above-described problems, and can reinforce an existing concrete structure that can give a desired strength improvement to an existing concrete structure and can be reinforced in a relatively short construction time. The purpose is to provide a structure.

  In order to achieve the above object, a reinforcing structure for an existing concrete structure according to the present invention includes a reinforcing hole perforated from one side of the existing concrete structure to a predetermined depth, and a length from the one side to the predetermined depth. The reinforcing member comprises an injection hole that communicates from a first opening provided on one end surface of the reinforcing member to a second opening provided on at least one of the side surface or the other end surface. And a pouring material interposed between the reinforcing hole and the reinforcing member.

  Here, existing concrete structures are reinforced concrete structures, unreinforced concrete structures, etc., and their structural specifications are arbitrary, such as existing buildings, bridges, water treatment facilities, dams, subway or underground track, tunnels, etc. Including concrete structures in general.

  When the reinforcing part of the existing concrete structure is, for example, a wall, a reinforcing hole extending from one side of the wall to an internal part having sufficient strength is drilled. Sufficient strength here refers to strength sufficient to support the end of a reinforcing member, which will be described later, such as a portion where there is no crack extending from the outer wall surface or a portion where the concrete strength is not reduced by salt damage or the like. Means.

  A reinforcement member is inserted into the reinforcement hole after the reinforcement hole is drilled to a part having sufficient strength among the reinforcement parts of the concrete structure. This reinforcing member is made of materials such as soft steel bars (different diameter bar steel, round steel) having the same length as the length of the reinforcing holes, carbon fiber reinforcing material in which carbon fiber is molded with resin, and high strength steel. Can be molded from an appropriate material having at least member strength such as desired compression strength and shear strength.

  The cross-sectional dimension of the reinforcing member is adjusted to be smaller than the cross-sectional dimension of the reinforcing hole. As the cross-sectional shape of the reinforcing hole and the reinforcing member, an appropriate shape such as a circle and a rectangle can be selected, and the cross-sectional dimension and the hole length (and the reinforcing member length) can also be set to appropriate dimensions. Alternatively, the reinforcing member may be a member in which the diameter of the tip of the reinforcing member is increased by inserting the reinforcing member into the reinforcing hole and pressing the reinforcing member against the end surface of the hole.

  Among the reinforcing members, an opening (first opening) is formed in one end surface (a surface facing the outside when the reinforcing member is inserted into the reinforcing hole), and the side surface of the reinforcing member or the other end surface ( A separate opening (second opening) is provided in at least one portion of the surface facing the bottom surface of the reinforcing hole when the reinforcing member is inserted into the reinforcing hole. An injection hole that connects one or more second openings is formed in the reinforcing member.

  By forming the injection hole inside the reinforcing member, the injection material can be injected / cured between the reinforcing hole and the reinforcing member via the first opening and the injection hole. Needless to say, the injected material penetrates / hardens from the reinforcing holes in cracks and gaps in the concrete, and the reinforcing material is reinforced.

  The injection material connects the reinforcing member and the reinforcing hole, such as mortar, non-shrink mortar, epoxy resin, urethane resin, water glass chemical solution, etc. with the desired adhesion strength and friction resistance, and penetrates into cracks and gaps. An appropriate material having sufficient fluidity can be selected.

  In addition, by temporarily fixing the upper part of the reinforcing member and the inner wall surface of the reinforcing hole by welding or the like, the reinforcing member is fixed at the same position even when a pushing force is applied to the reinforcing member when the injection material is press-fitted. be able to.

  According to the reinforcing structure of an existing concrete structure of the present invention, by applying the reinforcing member having the above structure, it is not necessary to drill an injection hole separate from the reinforcing hole, and further, the two holes are communicated with each other. Therefore, even when the number of reinforcement points increases, the reinforcement work can be performed in a relatively short time. Furthermore, a sufficient reinforcing effect can be expected by applying a reinforcing member and an injection material molded from a material having a desired strength.

  In another embodiment of the reinforcing structure for an existing concrete structure according to the present invention, in the reinforcing structure, a steel face material is fixed to one side surface of the concrete structure, and the steel face material is provided. The reinforcing hole is drilled from a surface opposite to the surface contacting the concrete structure to a predetermined depth of the concrete structure, and the reinforcing member having a length from the opposite surface to the predetermined depth is inserted. It is characterized by.

  The reinforcing structure of the present invention relates to a reinforcing structure of a structure in which a steel surface material is fixed to the outside of a concrete wall surface or floor surface at a reinforcing portion of a concrete structure to be reinforced, for example, a description The object is a track such as a monorail, a column member or a beam member around which a steel plate is wound, and a wall member in which a steel plate is attached to the outside of a concrete wall. In the reinforcing structure of the present invention, a reinforcing hole is drilled from the outside of the steel surface material, that is, the surface opposite to the surface contacting the concrete structure, and extends to a predetermined depth in the concrete structure. In this structure, a reinforcing member having the same length as the reinforcing hole is inserted, and an injection material is injected / cured between the reinforcing member and the reinforcing hole.

  When steel face materials are fixed on the outside of the concrete structure, it takes a lot of time to construct the reinforcement holes, so the construction time can be significantly reduced by applying the reinforcement structure of the present invention. It can be shortened.

  In another embodiment of the reinforcing structure for an existing concrete structure according to the present invention, the concrete structure includes a track concrete structure, a base concrete structure below the track concrete structure, and a main concrete structure below the concrete structure. The reinforcement hole penetrates through the track concrete structure and the base concrete structure and reaches a part of the main frame concrete structure.

  The reinforcement structure of the present invention is a concrete structure whose object is a track such as a monorail, and the structure has a laminated structure in which a plurality of concrete layers are laminated. In addition, the existing structure by which the steel surface material mentioned above is fixed to the end surface is also included.

  Of the concrete structures that make up the railroad tracks, steel surface materials, track concrete structures (track concrete boards), base concrete structures (base concrete boards), and permanent concrete structures below them (for example, tunnels) Reinforcing holes that extend at least halfway through the existing concrete structure are formed in existing structures formed from frames, inverted concrete boards, etc., and reinforcing members of the same length are inserted into the reinforcing holes. And the reinforcement structure of this invention is formed by connecting both with an injection material.

  In addition, the reinforcement structure formed by combining the reinforcement structure which consists of a reinforcement hole extended to a permanent concrete structure and the reinforcement hole extended to a base concrete structure may be sufficient, for example. In this case, the reinforcing holes extending to the middle layer of the laminated structure and the injection material injected into the inside mainly contribute to efficiently and reliably closing gaps and cracks between the middle layers.

  Furthermore, the method for reinforcing an existing concrete structure according to the present invention includes a first step of drilling a reinforcing hole from one side surface of the existing concrete structure to a predetermined depth, and a length from the one side surface to the predetermined depth. A reinforcing member having an injection hole that communicates with a second opening provided at least at one side of the side surface or the other end surface from the first opening provided on one end surface of the reinforcing member. And a second step of injecting an injection material from the first opening.

  According to the reinforcing method of the present invention, the reinforcement construction time required per one reinforcement point can be remarkably shortened as compared with the prior art, so that the reinforcement construction extension is long and the reinforcement of the track whose construction time is limited. Suitable for construction work.

As can be understood from the above description , according to the reinforcing structure of an existing concrete structure of the present invention, it is not necessary to drill an injection hole separate from the reinforcing hole into which the reinforcing member is inserted, and to connect both the holes. Therefore, the reinforcement construction time can be remarkably shortened as compared with the conventional technique, and the construction cost can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment of a reinforcing structure of the present invention, FIG. 2 is a side view of an embodiment of a reinforcing member, and FIG. 3A is a view taken along the arrow IIIa-IIIa in FIG. FIG. 3b shows the IIIb-IIIb arrow view of FIG. 4 and 5 are longitudinal sectional views of other embodiments of the reinforcing member, and FIG. 6 is a longitudinal sectional view of another embodiment of the reinforcing structure of the present invention. In addition, illustration of the reinforcement inside the concrete board to show in figure is abbreviate | omitted.

  FIG. 1 is a diagram showing a reinforcing structure that reinforces a track, which is an existing concrete structure. Hereinafter, it will be described together with the construction method.

  As one example of the track to be reinforced, a laminated structure comprising a track concrete disk C1, a base concrete disk C2 below it, an invert C3 below it, and a steel sheet S fixed above the track concrete disk C1. Target the orbit. For the purpose of supporting the static load, dynamic load, etc. of the vehicle including the monorail and transmitting the load to the invert C3 having sufficient strength, first, the reinforcing holes 2 extending from the upper part of the steel plates S to C3 Perforate.

  A reinforcing member 1 made of a different diameter steel bar having a diameter smaller than the inner diameter of the reinforcing hole and the same length as the reinforcing hole 2 is inserted into the reinforcing hole 2. In the reinforcing member 1, an opening 12a and a screw groove 13 are formed in the upper end surface, an opening 12b is formed in one place on the side surface of the main body 11, and an injection hole 12 that communicates both the openings 12a and 12b is formed. Has been. The reinforcing member can be formed from an appropriate material having required tensile strength, compressive strength, shear strength, etc., such as round steel, high-tensile steel, and carbon fiber reinforcing material, in addition to the different diameter steel bar.

  FIG. 2 is a side view of the reinforcing member 1. As shown in the figure, a screw groove 13 into which the cap 4 is screwed is formed on the upper end surface of the reinforcing member 1, and the cap 4 is screwed and connected to the screw groove 13 after the injection material 3 is injected. Yes. The cross-sectional shape of the opening 12a is shown in FIG. 3a, and the cross-sectional shape of the opening 12b is shown in FIG. 3b. Since the opening 12a serves as an injection port for the injection material, it is desirable from the viewpoint of workability to have as wide an opening area as possible. In the injection hole 12 that passes through the inside of the main body 11 other than such a location, In order to prevent the strength of the reinforcing member 1 from being lowered, it is desirable that the hole area be formed as small as possible. Further, on the upper part of the reinforcing member 1, a flange 14 for preventing the injection material 3 injected between the reinforcing member 1 and the reinforcing hole 2 from overflowing the injection hole 12 is provided on the main body 11. It is provided by connection or integral molding.

  Returning to FIG. 1, after inserting the reinforcing member 1 into the reinforcing hole 2, welding between the upper portion of the reinforcing member 1 and the inner wall surface of the reinforcing hole 2 (construction of the welded portion 5), post-injection injection material The reinforcing member is prevented from being pushed up against the pushing-up force of the reinforcing member due to. In addition, since the injection material 3 is prevented from overflowing upwards by the collar part 14, it is not necessary to weld the whole periphery of a reinforcement member, and the spot welding etc. of multiple places are enough.

  After temporarily connecting the reinforcing member 1 to the reinforcing hole 2 by welding, the injection material 3 is injected between the reinforcing member 1 and the reinforcing hole 2 through the opening 12 a and the injection hole 12. As shown in the figure, the injection material 3 includes a gap C1 ′ generated between the steel plate S and the track concrete disk C1, a gap C2 ′ generated between the track concrete disk C1 and the base concrete disk C2, and a base concrete C2 and an invert. It can also permeate each gap of the gap C3 ′ generated between C3 and close the gap. Further, the injected material penetrates into cracks inside the concrete not shown, and the cracks are closed.

  As the injection material 3, for example, a resin material such as an epoxy resin or a urethane resin, a mortar material including a foamed mortar, a water glass-based chemical liquid material, or the like can be applied.

  By the above construction method, the reinforcing structure 10 having sufficient strength against external force can be constructed in a very short time.

  FIG. 4 shows another embodiment of the reinforcing member. In this reinforcing member 1A, a plurality of openings 12b, 12c, 12d, and 12e are formed on the side surface of the main body 11, and a plurality of injection material outflow holes are provided by communicating each opening with the opening 12a on the upper end surface. This is a reinforcing member in which an injection hole 12 'is formed. By applying this reinforcing member 1A, it is possible to further reduce the time for injecting the injection material.

  5 shows a reinforcing member 1B having an injection hole 12 ″ connecting the opening 12a opened on the upper end surface of the main body 11 and the opening 12f opened on the lower end surface. Other embodiments of the reinforcing member include a reinforcing member having an injection hole formed by combining the injection hole 12 ′ and the injection hole 12 ″ in the main body portion.

  FIG. 6 illustrates another embodiment of the reinforcing structure. The reinforcing structure 10A has a structure in which the steel plate S to the upper part of the base concrete C2 are connected by the reinforcing member 1 on both sides in addition to the configuration of FIG. .

  According to this structure, it is possible to transmit the load from the vehicle to the invert C3 by the central reinforcing member 1 and reliably fill the gap or crack generated in the middle with the injection material. As shown in the figure, the confirmation pipes 61, 62, 63, 64 are provided at appropriate positions, and when the injection material is injected into the concrete, the air existing in the gaps and cracks is effectively released to the outside. At the same time, it is preferable to confirm that the injected material has been reliably injected into the concrete.

  Next, a demonstration experiment by the inventors will be described. This experiment was conducted using an existing track as a reinforcement target. Note that the reinforcing structure formed during the experiment is the reinforcing structure shown in FIG.

  The construction of the central reinforcing hole among the reinforcing holes in FIG. 6 will be described. First, a reinforcing hole with a diameter of 30 mm is drilled in a steel plate with a steel plate drill. Next, a 200 mm reinforcing hole is drilled in the reinforcing hole in the same direction from the concrete track to the lower end of the base concrete, and a reinforcing hole extending a little above the invert is formed.

  Next, a reinforcing member made of D19 different diameter steel bar is inserted into the reinforcing hole, and the upper part and the reinforcing hole are temporarily fixed by overlay welding.

  Sealing is applied to each connecting portion between the steel plate and the track concrete disc, the track concrete disc and the base concrete disc, and the base concrete disc and the invert so that the injected material does not leak from the inside of the concrete to the outside. A confirmation pipe as shown in Fig. 1 should be installed in place.

  Next, the chemical solution is injected at high pressure through the injection hole into the inside of the reinforcing hole and the reinforcing member, and into the gap or crack in the concrete. After confirming that the high-pressure injected chemical liquid overflows from the confirmation pipe, close the confirmation pipe. After the injection of the injection material is completed, the cap is screwed into the opening.

  The next day, the steel plate is hammered with an inspection hammer and the presence or absence of a gap is inspected again. A hole having a diameter of 11.5 mm is drilled in the confirmed gap portion, an injection solution is injected, and the hole is closed by welding.

  According to the inventor's calculations, compared to the conventional reinforcing method shown in FIG. 7 (however, reinforcing holes similar to those in FIG. 6 are formed on both sides of the reinforcing holes in FIG. 7) The result is that the construction cost can be reduced by about 2.5%. When this is applied to a track extending several kilometers, it is obvious that the construction cost can be remarkably reduced.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The longitudinal section of one embodiment of the reinforcement structure of the present invention. The side view of one embodiment of a reinforcing member. (A) is the IIIa-IIIa arrow directional view of FIG. 2, (b) is the IIIb-IIIb arrow directional view of FIG. The longitudinal section of other embodiments of a reinforcing member. The longitudinal section of other embodiment of a reinforcing member. The longitudinal section of other embodiments of the reinforcement structure of the present invention. The longitudinal section of the conventional reinforcement structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Reinforcing member (different diameter steel bar), 11 ... Main body, 12, 12 ', 12' '... Injection hole, 12a, 12b, 12c, 12d, 12e, 12f ... Opening, 2 ... Reinforcing hole, DESCRIPTION OF SYMBOLS 3 ... Injection material, 4 ... Cap, 5 ... Welded part, 10, 10A ... Reinforcement structure, S ... Steel plate, C1 ... Track concrete board, C2 ... Base concrete board, C3 ... Invert

Claims (2)

A reinforcing hole drilled from a steel surface fixed to one side of an existing concrete structure constituting a railroad or monorail track to a predetermined depth of the concrete structure;
A reinforcing member made of steel having a length of up to a depth of the reinforcing hole, the second opening that is opened in the first or at least two places of the side surface from an opening opened in one end face of the reinforcing member comprising an injection hole communicating, a reinforcing member inserted into the reinforcing hole, and injecting material interposed between the reinforcement hole and the reinforcing member, Ri Tona,
An upper portion of the reinforcing member is provided with a flange portion for preventing the injection material injected between the reinforcing member and the reinforcing hole from overflowing from the injection hole,
The upper part of the reinforcing member and the inner wall surface of the reinforcing hole provided in the steel surface material are welded at the welded portion, and the reinforcing member against the force of pushing up the reinforcing member by the injected material when the injected material is injected Reinforcement structure of the existing concrete structure that can not be pushed up . The concrete structure has a laminated structure composed of a track concrete structure, a base concrete structure below the track concrete structure, and a main frame concrete structure below the track concrete structure. reinforcing structure of the base concrete structure pierces existing concrete structure according to claim 1 comprising reach part of the設躯body concrete structure.

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