JP5594889B2 - Seismic reinforcement structure and seismic reinforcement method for concrete frame - Google Patents

Description

  The present invention relates to a seismic reinforcing structure and a seismic reinforcing method for a concrete frame such as a culvert, a retaining wall of a tunnel, and a building.

  A structure is known in which the seismic strength of a concrete frame such as a culvert is reinforced by applying shear reinforcement to the concrete frame. In this seismic reinforcement structure by shear reinforcement, a plurality of elongated insertion holes are formed on the reinforcing surface of the concrete frame, and a rod-like shear reinforcement is inserted into each of the insertion holes. The space between them is filled with a fixing material such as mortar.

  Filling the insertion hole of the shear reinforcement material in this seismic reinforcement structure with the fixing material is performed by inserting the shear reinforcement material into the insertion hole and then press-fitting the fixing material into the gap between the insertion hole and the shear reinforcement material. However, in this method, work labor such as mortar kneading on the spot and installation of fixing material injection holes is increased. Therefore, a fixing material such as mortar is accommodated in a cylindrical capsule, and after the capsule is placed in the insertion hole, the shear reinforcement material is driven into the insertion hole, the shear reinforcement material is inserted into the insertion hole, and shear reinforcement is performed. A method of filling a fixing material in a capsule pierced with a material into a gap between an insertion hole and a shear reinforcing material is performed (see Patent Document 1).

JP 2003-113673 A

  By the way, in the seismic reinforcement of a concrete frame such as a culvert, the necessary reinforcement may be achieved by the shear reinforcement, but the required earthquake resistance may not be obtained by the shear reinforcement alone. Therefore, there is a demand for a structure in which another reinforcement is applied in accordance with the shear reinforcement and a high seismic strength can be obtained. Furthermore, it is desired that the shear reinforcement and the other reinforcement can be efficiently performed.

  The present invention is proposed in view of the above problems, and it is possible to perform both shear reinforcement and expansion reinforcement on a concrete frame to obtain high seismic strength, and to efficiently perform the shear reinforcement and expansion reinforcement. An object is to provide a seismic reinforcement structure and a seismic reinforcement method for concrete frames.

The seismic reinforcement structure for a concrete frame according to the present invention is formed on the surface of the concrete frame and has a long hole-like insertion hole having a depth of half or more of the length in the depth direction of the concrete frame , and one of the rod portions. A substantially L-shaped shear reinforcement member that is provided in a state where the bent portion and the other rod portion protrude from the insertion hole while being placed in the insertion hole having a perforation diameter that matches the diameter of the one rod portion. And by immersing a cylindrical capsule in which water can be absorbed inside and containing cement mortar into water to absorb the water into the cement mortar, placing it in the insertion hole, and placing the one rod portion It consists of a cement mortar fixing material filled in a gap between the insertion hole and the one rod part, and an additional concrete and an additional reinforcing steel bar embedded in the additional concrete, Before reinforcement As muscle insert the rod portion before Symbol other hand extending along the Core Face and bent part, and an additional skeleton that is added to the outside of the Core Face, the said bent portion of said shearing reinforcements other Is embedded in the additional concrete at a position spaced from the additional reinforcing bar between the frame surface and the additional reinforcing bar .
According to this configuration, both the shear reinforcement and the extension reinforcement can be applied to the concrete frame, and a high seismic strength can be obtained. In addition, one rod portion of the substantially L-shaped shear reinforcement can function as a shear reinforcement for the existing housing, and at the same time, the other rod portion can be arranged in the additional housing to function as a reinforcing bar. Another type of construction called cutting reinforcement construction can be performed simultaneously in a single process, and shear reinforcement and expansion reinforcement can be performed efficiently. It is also possible to embed a shear reinforcement material with the other rod part longer than the thickness of the expansion chassis in the expansion chassis. The embedding depth (fixing length) can be ensured. And, compared with the case where the extension shear is provided by projecting the linear shear reinforcement from the chassis surface, the anchor strength superior to the existing chassis and the extension chassis can be exhibited, especially when the extension chassis is thin. The effect becomes more remarkable. In addition, since it is seismic reinforced with both shear reinforcement and expansion reinforcement, it is possible to reduce the number of shear reinforcements when placing multiple shear reinforcements, and the reinforcement and shear reinforcement of the existing frame Interference with the material can be avoided as much as possible.

The seismic reinforcement method for a concrete frame according to the present invention is a method in which one rod portion of a substantially L-shaped shear reinforcement material has a depth of half or more of the length in the depth direction of the concrete frame on the surface of the concrete frame. A step of forming a long insertion hole with a diameter corresponding to the diameter, and a cylindrical capsule capable of absorbing water inside and containing cement mortar is immersed in water so that the cement mortar absorbs water. A step of inserting and arranging the capsule in the insertion hole after the cement mortar is cured with a lapse of a predetermined time after the capsule breaks , and one rod portion of the substantially L-shaped shear reinforcement material the by pouring into the insertion hole, drained the cement mortar water by breaking the capsule, filled with cement mortar fixing material into the gap between the insertion hole and the one rod portion, predetermined With cured with the passage between the the state of the bent portion and the other bar portion of the shear reinforcement protruding from the insertion hole, so as to extend along the other of the rod protruding to the Core Face A step of disposing, the step of disposing the additional reinforcing reinforcing bar in a position separated from the surface of the housing and from the bent portion and the other rod portion of the shear reinforcement, and spaced from the surface of the housing Assemble the formwork, pour concrete between the formwork and the housing surface , embed the additional reinforcing reinforcing bar, and connect the bent portion and the other rod portion of the shear reinforcement material to the housing surface and the An additional concrete is formed so as to be embedded between the additional reinforcing steel bars at a position spaced from the additional reinforcing steel bars, and the bent portion and the other rod portion of the shear reinforcing material are used as insertion bars, and the frame the expansion to the outside of the surface concrete Characterized in that it comprises a step of forming a expansion precursor composed of said additional reinforcing rebar with.
According to this configuration, both the shear reinforcement and the extension reinforcement can be applied to the concrete frame, and a high seismic strength can be obtained. In addition, one rod portion of the substantially L-shaped shear reinforcement can function as a shear reinforcement for the existing housing, and at the same time, the other rod portion can be arranged in the additional housing to function as a reinforcing bar. Another type of construction called cutting reinforcement construction can be performed simultaneously in a single process, and shear reinforcement and expansion reinforcement can be performed efficiently. It is also possible to embed a shear reinforcement material with the other rod part longer than the thickness of the expansion chassis in the expansion chassis. The embedding depth (fixing length) can be ensured. And, compared with the case where the extension shear is provided by projecting the linear shear reinforcement from the chassis surface, the anchor strength superior to the existing chassis and the extension chassis can be exhibited, especially when the extension chassis is thin. The effect becomes more remarkable. In addition, since it is seismic reinforced with both shear reinforcement and expansion reinforcement, it is possible to reduce the number of shear reinforcements when placing multiple shear reinforcements, and the reinforcement and shear reinforcement of the existing frame Interference with the material can be avoided as much as possible.

Further, in the earthquake-proof reinforcement structure of the concrete skeleton of the present invention, cement mortar with forming a plurality of insertion holes to Core Face and pouring one bar of the substantially L-shaped shear reinforcement to each insertion hole the fixing material is filled, when the structure to align the extending direction of the other bar portion of the shear reinforcement extending along the Core Face protrude from the insertion holes, one of the rod portion and the other bar portion of the shear reinforcement It is possible to arrange the existing chassis and the additional chassis in a well-balanced manner at a predetermined interval, and it is preferable that the seismic strength can be improved on average as a whole.

Similarly, in the seismic reinforcement method for a concrete frame of the present invention, a plurality of insertion holes are formed on the surface of the frame, and one rod portion of a substantially L-shaped shear reinforcement material is placed in each insertion hole and cement mortar fixing is performed. When filling the material and aligning the extending direction of the other rod portion of the shear reinforcement member extending from the insertion hole and extending along the housing surface, the one rod portion and the other rod portion of the shear reinforcement material are It is possible to arrange the existing chassis and the additional chassis in a well-balanced manner at a predetermined interval, and it is preferable that the seismic strength can be improved on average as a whole.

  ADVANTAGE OF THE INVENTION According to this invention, while giving both shear reinforcement and expansion reinforcement to a concrete frame, high seismic strength can be obtained, and the shear reinforcement and expansion reinforcement can be performed efficiently.

Sectional drawing which shows the earthquake-proof reinforcement structure of the concrete frame of embodiment by this invention. Cross-sectional explanatory drawing explaining the reinforcement function of the seismic reinforcement structure of the concrete frame of embodiment. The perspective explanatory view explaining the example which applies the earthquake-proof reinforcement structure of the concrete frame of an embodiment to a wall and a pillar. Cross-sectional explanatory drawing explaining the construction process which forms an insertion hole in the frame surface of a concrete frame, and inserts a capsule. Cross-sectional explanatory drawing explaining the construction process which inserts a shear reinforcement into an insertion hole, breaks a capsule, and fills an insertion hole with a fixing material. Cross-sectional explanatory drawing explaining the construction process which assembles a formwork and forms an additional frame.

[Earthquake-proof reinforcement structure and earthquake-proof reinforcement method for concrete frame of embodiment]
Next, the seismic reinforcing structure and the seismic reinforcing method of the concrete frame according to the embodiment of the present invention will be described.

  As shown in FIGS. 1 and 2, the seismic reinforcement structure for a concrete frame of the present embodiment includes a plurality of long insertion holes 12 formed in the frame surface 11 of the concrete frame 10, one rod portion 21 and the other. And a cylindrical capsule 35 (see FIGS. 4 and 5) disposed in the insertion hole 12. ) And the fixing material 30 filled in the gap between the insertion hole 12 and the one rod 21, and protruding from the insertion hole 12. An additional housing 40 is provided on the outside of the housing surface 11 with the other rod portion 22 of the shear reinforcement member 20 extending along the housing surface 11 as an insertion line. The reinforcing bars in the existing concrete frame 10 are not shown.

  The shear reinforcement member 20 is provided by being bent at a substantially right angle by one rod portion 21 having a sufficient length with respect to the thickness of the concrete casing 10 to be shear reinforced and the bending portion 23 from the one rod portion 21. It is a substantially L shape which has the other rod part 22 and is a bending rebar in this example. An acute angle portion 24 is formed at the tip of one of the rod portions 21 so that the capsule 35 can be easily broken when the one rod portion 21 is driven. The shear reinforcing material 20 of this example is a deformed reinforcing bar having ribs 25 having a predetermined shape on the surface, but the surface shape is appropriate. Further, the shear reinforcement member 20 has a function of connecting the existing concrete housing 10 and an additional housing 40 described later.

  The fixing material 30 is, for example, an inorganic material such as cement mortar, and the capsule 35 including the fixing material 30 is formed of a material capable of absorbing water such as Japanese paper or nonwoven fabric. The capsule 35 of this example is immersed in water for a predetermined time and then inserted into the insertion hole 12 for use. The fixing material 30 absorbed by the immersion in water is cured when a predetermined time elapses. That is, the fixing material 30 that has flowed out of the capsule 35 into the insertion hole 12 is cured after a predetermined time and is filled into the insertion hole 12.

  The expansion frame 40 is composed of an expansion concrete 41 that is expanded outside the frame surface 11 and an expansion reinforcement bar 42 that is embedded in the expansion concrete 41 with the other rod portion 22 of the shear reinforcement member 20 as a reinforcing bar. The The additional concrete 41 in the illustrated example is an additional wall provided along the frame surface 11 and is provided so that the other rod portion 22 and the bent portion 23 are embedded as a reinforcing bar. Further, in the illustrated example, the reinforcing reinforcing bars 42 are obtained by arranging the vertical bars 421 and the horizontal bars 422 in a lattice shape, and connecting the vertical bars 421 and the horizontal bars 422 by welding or the like, and at a position away from the shear reinforcing material 20. It is embedded in the expanded concrete 41.

  In the seismic reinforcement structure of the present embodiment, the force acting on the concrete housing 10 is sheared by one of the bars 21 and the fixing material 30 of the shear reinforcement 20, and the other rod 22 of the shear reinforcement 20 and the additional chassis. Seismic strength is strengthened by expansion reinforcement by 40 mag. For example, when a force is applied to the thick arrow shown in FIG. 2, bending reinforcement is performed by the additional reinforcing steel bar 42 or the portion A of the additional concrete 41, and one bar portion 21 of the shear reinforcing material 20 or the fixing material 30. Shear reinforcement is made by the B part of the material.

  In addition, as shown in FIG. 3, this seismic reinforcement structure can be provided simultaneously in, for example, a continuous concrete wall 10a of an existing wall and a concrete wall 10b of an existing column. In the illustrated example, one rod portion 21 of a substantially L-shaped shear reinforcement member 20 is placed in each insertion hole 12 formed in the concrete housing 10a of the existing wall and the concrete housing 10b of the existing column, and the fixing material. 30 (not shown) is filled, and the extending direction of the other rod portion 22 of the shear reinforcement member 20 protruding from each insertion hole 12 and extending along the housing surface 11 is aligned. In this configuration, one rod portion 21 and the other rod portion 22 of the shear reinforcement material 20 can be arranged in a well-balanced manner at a predetermined interval on the existing concrete frame 10 and the additional frame 40, and the average is more earthquake-resistant on average. Strength can be improved.

  In the seismic reinforcement method for constructing the seismic reinforcement structure of the concrete frame of this embodiment, as shown in FIG. 4, for example, a cement mortar fixing material 30 is accommodated, and capsules 35 capable of absorbing water inside are stored in a water storage tray. 51 is immersed in water 52 for about 1 to 3 minutes to cause the fixing material 30 to absorb water, and ink is drawn out at a predetermined position of the existing concrete housing 10, and an elongated insertion hole 12 is formed on the housing surface 11. A plurality of holes are formed with a drill or the like. The drilling diameter of the insertion hole 12 is set to be slightly larger than the diameter of the one rod portion 21 of the shear reinforcement member 20, and the drilling depth is, for example, more than half of the length in the depth direction. The depth is sufficient with respect to the thickness of the casing 10.

  Then, the immersed elongated capsule 35 is inserted into the insertion hole 12. After that, as shown in FIG. 5, the hammer 53 is used to drive the substantially L-shaped shear reinforcement material 20 to insert one rod portion 21 into the insertion hole 12, and the capsule portion 35 is broken by the one rod portion 21. Then, the fixing material 30 is caused to flow out, and the one rod portion 21 is disposed in the insertion hole 12 and the gap between the insertion hole 12 and the one rod portion 21 is filled with the fixing material 30 of cement mortar. The fixing material 30 filled in the gap is cured as a predetermined time elapses. Further, the other rod portion 22 of the shear reinforcement member 20 is disposed so as to extend along the housing surface 11 in a state of protruding from the insertion hole 12 by driving the one rod portion 21 into the insertion hole 12. .

  Thereafter, as shown in FIG. 6, the additional reinforcing bars 42 are arranged at positions spaced outside the housing surface 11, and the formwork 54 is assembled and arranged outside the reinforcing reinforcing bars 42. Furthermore, concrete is poured between the formwork 54 and the frame surface 11 to form the additional concrete 41, and the additional reinforcing bar 42, the other rod portion 22 and the bent portion 23 of the shear reinforcing material 20 are placed in the additional concrete 41. Buried in In other words, the additional housing 40 is formed outside the housing surface 11 with the other rod portion 22 of the shear reinforcement member 20 and the like as an insertion line.

  And after the expansion concrete 41 hardens | cures, the seismic reinforcement structure of the concrete frame 10 of FIG. 1 is completed by removing the formwork 54. FIG. If necessary, the formwork 54 can be left as it is without being removed to provide a seismic reinforcement structure.

  In the seismic reinforcement structure and seismic strengthening method of the concrete frame of this embodiment, both the shear reinforcement and the extension reinforcement can be applied to the existing concrete frame 10 such as an existing wall, and a high seismic strength can be obtained. Furthermore, one rod portion 21 of the substantially L-shaped shear reinforcement member 20 functions as shear reinforcement of the existing housing, and at the same time, the other rod portion 22 is arranged in the additional housing 40 to function as a reinforcing bar. The shear reinforcement and the reinforcing bar construction can be performed simultaneously in one process, and the shear reinforcement and the extension reinforcement can be efficiently performed.

  Further, it is possible to embed the shear reinforcement member 20 having the other rod portion 22 longer than the thickness of the extension case 40 in the extension case 40, and even when the extension case 40 is thin, the shear reinforcement member 20. It is possible to secure a sufficient embedding depth (fixing length) with respect to the additional housing 40. And, compared with the case where an extension housing is provided by projecting a linear shear reinforcement from the housing surface, it is possible to exert an excellent anchoring force on the existing housing and the extension housing, particularly when the extension housing 40 is thin. The effect becomes more remarkable.

  In addition, since the seismic reinforcement is performed by both the shear reinforcement and the extension reinforcement, it is possible to reduce the number of placement of the shear reinforcement members 20, and the interference between the reinforcement of the existing concrete frame 10 and the shear reinforcement members 20 is minimized. Can be avoided. Further, when the additional reinforcing bar 42 is provided in the additional casing 40 in addition to the shear reinforcing member 20, the seismic strength of the existing concrete casing 10 and the additional casing 40 is further improved in combination with the reinforcement by the shear reinforcing member 20. be able to.

[Modifications of Embodiment, etc.]
In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification within the applicable range, or these To which the other configurations disclosed in the present specification are added or specified, or those partial configurations are deleted and specified to the extent that partial effects can be obtained. The following modifications are also included.

  For example, in the example of FIG. 3, the extending direction of the other end 22 of the shear reinforcing material 20 inserted and arranged in the plurality of insertion holes 12 is aligned. However, when high-level reinforcement is required locally, etc. It is also possible to install the other end 22 of some of the shear reinforcements 20 so as to extend in a different direction from the other end 22 of the other shear reinforcements 20.

  Moreover, although the said embodiment demonstrated the example which reinforces an existing wall and an existing pillar, the site | parts made into the reinforcement object, such as a beam and a ceiling, are appropriate.

  The present invention can be used for seismic reinforcement of, for example, a culvert, a retaining wall of a tunnel, and a continuous wall of a building.

DESCRIPTION OF SYMBOLS 10 ... Concrete frame 11 ... Frame surface 12 ... Insertion hole 20 ... Shear reinforcement 21 ... One rod part 22 ... The other rod part 23 ... Bending part 24 ... Acute angle part 25 ... Rib 30 ... Fixing material 35 ... Capsule 40 ... Additional frame 41 ... Additional concrete 42 ... Additional reinforcement reinforcing bar 421 ... Vertical reinforcement 422 ... Horizontal reinforcement 51 ... Water storage tray 52 ... Water 53 ... Hammer 54 ... Formwork

Claims (2)

An elongated hole-shaped insertion hole formed on the surface of the concrete frame and having a depth of at least half the length of the concrete frame in the depth direction ;
A substantially L-shape in which one rod portion is provided in the insertion hole having a bore diameter matching the diameter of the one rod portion, and the bent portion and the other rod portion protrude from the insertion hole. Shaped shear reinforcement,
A cylindrical capsule that can absorb water and contains cement mortar is immersed in water so that the cement mortar absorbs water, is placed in the insertion hole, and is broken by placing one of the rods. drained, and the cement mortar fixing material filled in the gap between the insertion hole and the one rod section,
Is composed of a expansion reinforcing rebar is embedded with additional concrete to the expansion in concrete, said as muscle pointing stick portion before Symbol other hand that with the bent portion of the shear reinforcement extending along the Core Face, the skeleton With an additional enclosure to be added outside the surface ,
The bent portion and the other rod portion of the shear reinforcing material are embedded in the additional concrete at a position spaced from the additional reinforcing reinforcing bar between the frame surface and the additional reinforcing reinforcing bar. Seismic reinforcement structure for concrete frame. On the surface of the concrete frame, the hole has a depth of more than half the length of the concrete frame in the depth direction, and has a perforation diameter that matches the diameter of one rod portion of the substantially L-shaped shear reinforcement material. Forming the insertion hole,
A state in which a cylindrical capsule capable of absorbing water inside and containing cement mortar is immersed in water to absorb water into the cement mortar, and the cement mortar hardens as a predetermined time elapses after the capsule breaks After that, the step of inserting and arranging the capsule in the insertion hole,
By placing one rod portion of the substantially L-shaped shear reinforcement material in the insertion hole, the cement mortar that breaks the capsule and absorbs water flows out, and the insertion hole and the one rod portion Cement mortar fixing material is filled in the gap between the two, and cured with the passage of a predetermined time, and the bent portion of the shear reinforcement material and the other rod portion are projected from the insertion hole, and the other protruding A step of arranging the rod portion of the rod so as to extend along the surface of the housing;
A step of disposing the additional reinforcing reinforcing bar at a position apart from the housing surface and away from the bent portion and the other rod portion of the shear reinforcement;
Assembling the formwork away from the housing surface, pouring concrete between the formwork and the housing surface , embedding the additional reinforcing reinforcing bar, and the bent portion and the other rod portion of the shear reinforcing material Are embedded at a position spaced apart from the additional reinforcing reinforcing bar between the frame surface and the additional reinforcing reinforcing bar to form an additional concrete, and the bent portion and the other rod portion of the shear reinforcing material Forming an additional frame composed of the additional concrete and the additional reinforcing steel bars on the outside of the frame surface,
A seismic reinforcement method for concrete frames, characterized by comprising: