JP4919631B2 - Reinforcing body, method of building pile using the reinforcing body, and method of building structural frame using the reinforcing body - Google Patents

Reinforcing body, method of building pile using the reinforcing body, and method of building structural frame using the reinforcing body Download PDF

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JP4919631B2
JP4919631B2 JP2005225114A JP2005225114A JP4919631B2 JP 4919631 B2 JP4919631 B2 JP 4919631B2 JP 2005225114 A JP2005225114 A JP 2005225114A JP 2005225114 A JP2005225114 A JP 2005225114A JP 4919631 B2 JP4919631 B2 JP 4919631B2
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reinforcing body
reinforcing
pile
concrete
body
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JP2007039967A (en
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忠彦 加藤
徹 豊島
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大亜ソイル株式会社
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  The present invention relates to a reinforcing body provided in a structure for improving seismic performance, a method for building a pile using the reinforcing body, and a method for building a structural frame using the reinforcing body.

Conventionally, in order to improve the seismic performance of piles and structural frames, a method of attaching a carbon fiber sheet, an aramid fiber sheet or other reinforcing fiber sheet as a reinforcing member around an existing concrete pile is known (patent document). 1). In addition, in order to make the base part of the existing building seismic isolation, prior to the installation of the seismic isolation device, the pile is exposed by excavating under the foundation of the foundation building, Applying adhesive and winding the carbon fiber sheet, curing the adhesive and integrally bonding with the pile, or surrounding the outer periphery of this pile with divided tubular members and joining the divided parts A construction method is known in which a non-shrinkable curable material is filled between an integrated tubular member and a pile (see Patent Document 2).
Japanese Patent Laid-Open No. 2000-291023 (page 3, FIG. 3, FIG. 4) Japanese Patent Laid-Open No. 10-46605 (page 3-4, FIG. 3)

  However, in the above conventional pile reinforcement method, the existing piles are seismically strengthened, so the concrete parts scraped off the outside and the existing piles exposed from the ground are strengthened. In order to securely bond the fiber sheet or to enclose it with divided tubular members, it is necessary to perform a surface treatment operation so that the surface becomes a clean and smooth surface. . Moreover, since the reinforcement work is performed on site, there is a problem that work efficiency is poor.

  The present invention has been made to solve the above-described problems. A reinforcing body that can be provided with a reinforcing body at the same time as the construction of the structure, a method for constructing a pile using the reinforcing body, and the method An object of the present invention is to provide a method for constructing a structural frame using a reinforcing body. The present invention also provides a reinforcing body that can be easily and efficiently attached to a structure after construction, a method of building a pile using the reinforcing body, and a method of building a structural frame using the reinforcing body. It is for the purpose.

The reinforcing body according to claim 1 is a reinforcing body that reinforces the strength of a structure built by placing concrete, and the reinforcing body is made of a material that does not contribute to strength reinforcement and is easy to mold. A reinforcing fiber is bonded to the inner surface of a tubular material formed into a hollow cylindrical shape according to the shape .

In the reinforcing body according to claim 1, in the reinforcing body that reinforces the strength of the structure built by placing concrete, the reinforcing body is made of a material that does not contribute to strength reinforcement and is easy to mold. Since the reinforcing fiber is bonded to the inner surface of the tubular material formed into a hollow cylindrical shape according to the shape, when the reinforcing body is provided on the structure, the structure can increase the tensile strength by the reinforcing fiber. The thickness of the structure is reduced. In addition, the reinforcing body can be freely molded according to the structure, and the weight is reduced, so that it is easy to carry to the site.

Further, the reinforcing body according to claim 2 is formed by cutting the tubular material in the extending direction, separating the tubular material, providing a connection portion at the separation end portion, and connecting the connection portions to each other on the inner surface of the tubular material arranged. The reinforcing fiber is bonded.

In the reinforcing body according to claim 2 , the tubular material is cut and cut in the extending direction, and a connection portion is provided at the cut end, and the reinforcing fiber is provided on the inner surface of the tubular material which is arranged by connecting the connection portions. When molding pillars and beams that make up the structural frame of the structure, the tubular material that has been cut in advance is carried to the site, and the connecting parts are connected to each other at the site to prepare the tubular material. Since the reinforcing fibers are bonded to the inner surface of the material, a large amount of tubular material can be carried to the site at a time, and the carrying work can be made efficient.
Moreover, the reinforcement body which concerns on Claim 3 comprises a raw material with the thin iron plate.

  The reinforcing body according to claim 4 is such that the tubular material has any one of a circular shape, an elliptical shape, and a quadrangular cross section.

  In the reinforcing body according to claim 4, the tubular material is applied to various uses by changing the shape of the tubular body by changing the cross-section to any one of a circle, an ellipse, and a quadrangle. be able to.

  The pile construction method according to claim 5 is a pile construction method in which concrete is placed in a pile hole drilled in the ground, and the reinforcing body according to claim 1 is arranged in the pile hole. Later, concrete was cast.

  In the pile construction method according to claim 5, in the pile construction method constructed by placing concrete in a pile hole drilled in the ground, the reinforcing body according to claim 1 is arranged in the pile hole. Thereafter, by placing concrete, the reinforcing body is fixed to the outer surface side of the placed concrete after curing and curing. For this reason, the horizontal stress (bending stress) of the pile can be increased and the earthquake resistance can be improved. Therefore, the diameter of the pile can be reduced.

  In the method for building a pile according to claim 6, after the reinforcing body is arranged, the reinforcing bars are arranged inside the reinforcing body.

  In the method of building a pile according to claim 6, after the reinforcing body is arranged, the reinforcing bars are arranged inside the reinforcing body, so that the seismic performance is more enhanced by the reinforcing body in addition to the seismic performance secured by the reinforcing bars. improves.

  A method for constructing a structural casing according to claim 7 is a method for constructing a structural casing in which concrete is placed on an installed formwork to construct the structural casing, and the reinforcing body according to claim 1 is brought into contact with the inner surface of the formwork. The concrete is placed in the reinforcement body and demolded.

  The method for constructing a structural body according to claim 7 is the method for constructing a structural body in which concrete is placed on an installed formwork to construct the structural body, and the reinforcing body according to claim 1 is brought into contact with the inner surface of the formwork. For example, when it is applied to a pillar of a structural frame, the reinforcement is placed on the formwork and the concrete is placed. Thereafter, a reinforcing body is fixed to the outer surface of the structural housing. For this reason, the reinforcing body can be easily fixed to the vertical structural housing, and the working efficiency is improved.

The reinforcing body according to claim 8 is a reinforcing body that reinforces the strength of a structure built by placing concrete, the reinforcing body including a reinforcing fiber having an opening at least at one end and a tubular shape. And a holding member that holds the fiber in a desired cylindrical shape.

In the reinforcing body according to claim 8 , in the reinforcing body that reinforces the strength of a structure constructed by placing concrete, the reinforcing body includes a reinforcing fiber having an opening at least at one end and a tubular shape. Since the structure is provided with a holding member that holds the fiber in a desired cylindrical shape, when the structure is provided with a reinforcing body, the structure can be increased in tensile strength by the reinforcing fiber, and the structure is thinned. Is planned.
Moreover, the pile construction method using the reinforcing body according to claim 9 is the pile construction method according to claim 8, wherein the pile hole is constructed by placing concrete in a pile hole drilled in the ground. After placing the described reinforcing body, concrete is placed.

The pile construction method using the reinforcing body according to claim 9 is the pile construction method according to claim 8 , wherein the pile hole is constructed by placing concrete in a pile hole drilled in the ground. After placing the reinforcing body, concrete is placed.
Furthermore, the method for constructing a pile using the reinforcing body according to claim 10 is the method according to claim 9 , in which concrete is placed by placing reinforcing bars inside the reinforcing body.

The reinforcing body according to claim 1 is a reinforcing body that reinforces the strength of a structure built by placing concrete, and the reinforcing body is made of a material that does not contribute to strength reinforcement and is easy to mold. Since the reinforcing fiber is bonded to the inner surface of the tubular material formed into a hollow cylinder according to the shape, the seismic performance of the structure is improved, the structure can be thinned, and the cost is reduced. be able to.

  The pile construction method according to claim 5 is a pile construction method in which concrete is placed in a pile hole drilled in the ground, and the reinforcing body according to claim 1 is arranged in the pile hole. After that, since concrete is placed, the earthquake resistance performance of the pile is improved, the diameter of the pile can be reduced, and the cost can be reduced.

  A method for constructing a structural casing according to claim 7 is a method for constructing a structural casing in which concrete is placed on an installed formwork to construct the structural casing, and the reinforcing body according to claim 1 is brought into contact with the inner surface of the formwork. Since the concrete is placed in the reinforcement body and removed from the mold, applying it to the pillar of the structural frame can improve the earthquake resistance of the pillar, reduce the thickness of the pillar, and reduce the cost. Can be achieved. Moreover, there exists an effect which work efficiency improves by arrange | positioning a reinforcement body to a formwork previously and making it adhere to concrete after mold removal.

The reinforcing body according to claim 8 is a reinforcing body that reinforces the strength of a structure built by placing concrete, the reinforcing body including a reinforcing fiber having an opening at least at one end and a tubular shape. Since it comprises the holding member that holds the fiber in a desired cylindrical shape, the earthquake resistance of the structure is improved, the structure can be thinned, and the cost can be reduced. Further, since the reinforcing body can be easily set on site, workability is improved.

  The purpose of fixing the reinforcing body to the structure was realized by arranging a reinforcing body with reinforcing fibers bonded to the inner surface of the tubular material and placing concrete on the inner surface of the reinforcing body.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is an overall view of a reinforcing body according to a first embodiment of the present invention. As shown in FIG. 1, the reinforcing body 2 according to the present embodiment is formed by forming a thin iron plate having a thickness of 1 mm or less into a tubular shape (cylindrical shape), and applying an adhesive such as an epoxy resin (not shown) to the inner surface of the tubular material 3. The carbon fiber sheet (or aramid fiber sheet) (reinforcing fiber) 4 is wound around the adhesive surface, and the adhesive is cured and integrally bonded. The tubular material 3 may have a circular cross section or a quadrangular shape (see the reinforcing body 2B shown in FIG. 5A). This tubular material 3 itself does not contribute to strength reinforcement, but serves as a holding body for holding the carbon fiber sheet 4 in a desired shape based on the construction plan, and is integrally joined to the carbon fiber sheet 4. It is only after the reinforcement performance. The reinforcing body 2 is manufactured in advance based on a construction plan prior to construction on site. That is, the diameter D1 and the length H1 of the reinforcing body 2 are determined according to the pile or the structural frame to be constructed. That is, when the pile diameter is used for a pile hole with D2 (see FIG. 3), the diameter D1 of the reinforcing body 2 is set slightly smaller than the pile diameter D2 (D2> D1), and the reinforcing body 2 is suspended from the pile hole. As a result, a slight gap S1 (approximately 100 mm in this embodiment) is formed between the inner surface of the pile hole and the outer surface of the reinforcing body 2.

  Next, based on the effect | action of the reinforcement body 2 which concerns on the said 1st Example, the construction method of the pile using the reinforcement body which concerns on this invention is demonstrated. (A) thru | or (G) of FIG. 3 is process explanatory drawing which shows the construction process of a pile in order, respectively. In the case of the same-diameter excavation method as shown in FIG. 3A, a casing 6 having a diameter equal to or slightly larger than the excavation diameter is press-fitted with a power jack (vibro hammer, kelly bar) (not shown), and then an earth drill The pile hole 5 is excavated by a construction method such as a construction method or a reverse construction method (see FIG. 3A). When the slime treatment is completed, the pre-manufactured reinforcing body 2 is brought to the site, and the reinforcing body 2 is suspended in the pile hole 5 having the pile diameter D2 (see FIG. 3B). The reinforcing body 2 is obtained by attaching a carbon fiber sheet 4 to the inner surface of an iron plate tubular material 3 with an adhesive, and making the carbon fiber sheet 4 come into close contact with the tubular material 3 to be cured. Next, the reinforcing bar 7 is suspended inside the reinforcing body 2 (see (C) and (D) of FIG. 3). As shown in FIG. 3H, the reinforcing bar rod 7 includes a main bar 7A arranged in the circumferential direction and a hoop bar 7B provided on the outer peripheral side of the main bar 7A and connecting the main bar 7A. A spacer 7C is provided between the hoop muscle 7B and the reinforcing body 2. Next, the tremy pipe 8 is installed in the reinforcing bar 7 and concrete C is placed (see FIG. 3E). The cast concrete C penetrates into the fine gaps of the carbon fiber sheet 4 of the reinforcing body 2, and the carbon fiber sheet 4 is wound into the concrete C. When the cast concrete C reaches a predetermined level, the casing 6 is pulled out (see FIG. 3F), and the concrete C is cast to the upper end of the pile hole 5 to expose the joint 7A of the reinforcing bar 7. (Refer to FIG. 3G). S1 between the inner surface of the pile hole 5 and the reinforcing body 2 may be filled with concrete C or backfilled with excavated soil. After the curing of the cast concrete C, the reinforcing body 2 is embedded in the cast concrete C or fixed to the outer surface of the cast concrete C. At this time, the carbon fiber sheet 4 is in close contact with the hardened concrete C. Thus, in the pile construction method using the reinforcing body according to the first embodiment, since the reinforcing body 2 is fixed to the outer surface side of the concrete C, the horizontal stress (bending stress) of the pile is increased, and the earthquake resistance is increased. Performance can be improved. Therefore, the diameter of the pile can be reduced.

  Further, the reinforcing body 2 does not need to be installed over the entire length H2 of the pile. For example, the length H1 of the reinforcing body 2 is shorter than H2 (H2> H1) and is hung above the pile hole 5 It is also possible to hold the concrete C and hold the reinforcing member 2 to the upper part of the pile. Further, ribs may be formed on at least one of the inner surface and the outer surface of the reinforcing body 2 in order to improve the adhesion with the concrete C.

  Next, a method for constructing a structural housing using the reinforcing body according to the present invention will be described based on the operation of the reinforcing body 2 according to the first embodiment. 4 (A) to 4 (F) are process explanatory views sequentially showing the construction process of the concrete pillar constituting a part of the structural frame, and the cylindrical reinforcing body shown in FIG. 4 (A). 2A is manufactured by preliminarily determining the diameter and dimensions based on the construction plan and attaching the carbon fiber sheet 4 to the inner surface. In the reinforcing body 2A, the outer diameter D3 is set to be substantially the same as or slightly larger than the outer diameter D4 of the column (D3≈D4 or D3> D4). The length H3 of the reinforcing body 2A is set to be substantially the same as or smaller than the length H4 of the column 10 (H3≈H4 or H3 <H4). The column provided on the footing or beam 11 is first attached with a part 12A of the mold 12 at a predetermined position based on the construction plan (see FIG. 4B), and then on the beam 11. The exposed joint portion 11A and the reinforcing bar 13 are joined (see FIG. 4C). The reinforcing bar 13 has substantially the same configuration as the reinforcing bar 7 and includes a main bar, a hoop bar, and a spacer. Next, the pre-manufactured reinforcing body 2 </ b> A is brought to the site, and the reinforcing body 2 </ b> A is disposed outside the reinforcing bar 13. Thereafter, the mold frame 12 surrounds the reinforcing body 2A, and the inner surface of the mold frame 12 is disposed so as to contact the outer surface of the reinforcing body 2A (see FIG. 4D). Next, concrete C is placed in the reinforcing body 2A of the mold 12 (see FIG. 4E). After the curing and curing of the concrete C, the mold 12 is removed and the pillar 10 is molded (see (F) in FIG. 4). Thus, the reinforcing body 2A is fixed to the outer surface of the concrete C at the time of demolding, and the carbon fiber sheet 4 is in close contact with the concrete C. Thus, in the construction method of the structural frame using the reinforcing body according to the first embodiment, since the reinforcing body 2A is fixed to the outer surface of the concrete column 10, the tensile strength of the column 10 is increased and the seismic performance is improved. Can be improved. Accordingly, the structural housing can be thinned. Moreover, in the construction method of the structural casing using the reinforcing body according to the first embodiment, when applied to the pillar of the structural casing, when the reinforcing body 2A is arranged on the mold 12 and the concrete C is placed, demolding is performed. Thereafter, the reinforcing body 2A is fixed to the outer surface of the structural housing. For this reason, the reinforcing body can be easily fixed to the vertical structural housing, and the working efficiency is improved. Further, the reinforcing body 2A does not need to be installed over the entire length of the column 10. For example, the length H3 of the reinforcing body 2A is formed shorter than the column 10 and is fixed to a desired position of the column 10. Good.

  (A) thru | or (F) of FIG. 5 is process explanatory drawing which shows the construction process in case a concrete pillar is the prism 10A in order, and the square cylinder reinforcement 2B shown to (A) of FIG. According to a modification of the reinforcing bodies 2 and 2A according to the first embodiment, the reinforcing bodies 2 and 2A according to the first embodiment are formed in a circular or cylindrical shape. It has substantially the same configuration except that it is formed in a cylindrical shape. The rectangular tubular reinforcing body 2B is manufactured in advance by setting the vertical and horizontal dimensions W1 × L1 of the cross section to be substantially the same as or slightly larger than the vertical and horizontal dimensions W2 × L2 of the column 10A based on the construction plan (W1≈W2). Or W1> W2, L1≈L2 or L1> L2). In the prism 10A provided on the footing or the beam 11, a part 14A of the mold 14 is first attached at a predetermined position based on the construction plan (see FIG. 5B), and then on the beam 11. The joint 11A and the reinforcing bar 13 exposed to each other are joined (see FIG. 5C). Next, the reinforcing body 2B carried to the site is disposed outside the reinforcing bar 13 and then the mold 14 is installed so as to surround the reinforcing body 2B. At this time, it arrange | positions so that the inner surface of the formwork 14 may contact the outer surface of the reinforcement body 2B (refer (D) of FIG. 5). Next, concrete C is placed in the reinforcing body 2B of the mold 14 (see FIG. 5E). After the curing and curing of the concrete C, the mold 14 is removed and the pillar 10A is molded. Thus, the reinforcing body 2B is fixed to the outer surface of the concrete C at the time of demolding.

  FIG. 6 is a perspective view showing a reinforcing body according to a second embodiment of the present invention. This reinforcing body 22 is hollow in the reinforcing bodies 2, 2A and 2B according to the first embodiment and the modifications thereof. The main body 23 is formed in a cylindrical shape, but the hollow rectangular cylindrical body is cut in the extending direction at two corners adjacent to each other, and a thin iron plate having a thickness of 1 mm or less is bent in a U-shape. And a lid portion 25 that covers and covers the upper end opening 24 of the main body portion 23. Connection portions 26 are formed on both upper end portions 24 </ b> A and 24 </ b> B of the main body portion 23, and connection portions 27 are also formed on the lid portion 25 at portions corresponding to the connection portions 26. When these connection portions 26 and 27 are connected to each other, the main body portion 23 and the lid portion 25 form a hollow rectangular tube shape. The main body portion 23 and the lid portion 25 are manufactured in advance based on a construction plan prior to construction on site. That is, the vertical and horizontal dimensions W3 × L3 of the cross section of the main body 23 are set to be substantially the same as or slightly larger than the vertical and horizontal dimensions W4 × L4 (see (Cc) of FIG. 7) of the beam 30 of the structural frame ( W3≈W4 or W3> W4, L3≈L4 or L3> L4). When the beam 30 is molded, the main body portion 23 is installed in advance on the mold, and is fixed to the lower surface and both side surfaces of the beam 30 after demolding. When the cover part 25 is connected and attached to the main body part 23 fixed to the beam 30 so that the connection parts 26 and 27 correspond to each other (see FIG. 7E), the entire circumference of the beam 30 is covered with a thin iron plate. It is like that. When the reinforcing body 22 covers the entire circumference of the beam 30 with the main body portion 23 and the lid portion 25, an adhesive such as an epoxy resin (not shown) is applied to the outer surfaces of the square cylindrical thin steel plates 23 and 25, A carbon fiber sheet (or aramid fiber sheet) 4 is wound around the surface, the adhesive is cured, and is integrally joined.

    Next, a method for constructing a structural housing using the reinforcing body according to the present invention will be described based on the function of the reinforcing body 22 according to the second embodiment. FIGS. 7A to 7D are process explanatory views sequentially showing the construction process of a concrete beam constituting a part of the structural frame. FIGS. 7A to 7C are respectively diagrams. 7 is a longitudinal cross-sectional view of a mold in each step (A) to (C). As for the reinforcement body 22 shown in FIG. 6, the main-body part 23 and the cover part 25 are first manufactured previously based on a construction plan. In forming the beam of the structural frame, as shown in FIG. 7A, first, the mold 31 is placed between the prisms 10A. The mold frame 31 includes a lower frame 31A whose upper surface is disposed so as to be flush with the upper end surface of the prism 10A, and both side frames 31B and 31C that are continuously provided on the left and right sides of the lower frame 31A. (See (Aa) in FIG. 7). At this time, the upper end surface of the prism 10A is exposed, and the joint portion 11A protrudes from the upper end surface. When the formwork 31 is installed, the pre-manufactured main body part 23 is carried, the main body part 23 is placed on the upper surface of the lower frame 31A, and then the reinforcing bar 13 is disposed in the main body part 23, The reinforcing bar 13 and the connecting portion 11A are connected by welding (see FIGS. 7B and 7B). At this time, the outer surface of the main body portion 23 comes into close contact with the molding surface of the mold 31. Next, the concrete C is placed in the main body 23, and after curing and after demolding, the lid 25 is connected to the main body 23, and the outer periphery of the beam 30 is connected with the main body 23 and the lid 25. It covers (see (C) and (Cc) in FIG. 7). Then, an adhesive such as an epoxy resin (not shown) is applied to the outer surfaces of the main body part 23 and the lid part 25 connected to each other, and a carbon fiber sheet (or aramid fiber sheet) 4 is wound around the adhesive surface to bond the adhesive. It hardens | cures and the reinforcement body 22 is provided in the concrete outer surface of the beam 30 (refer FIG.7 (D)). Thus, in the reinforcing body 22 according to the second embodiment, the reinforcing body can be provided also in the horizontal structural housing, and the working efficiency is improved as compared with the case of retrofitting. In the process of FIG. 7, although the beam of the structural frame is shown, it goes without saying that the underground beam is included.

  In the second embodiment, the lid 25 is separated from the main body 23. However, the present invention is not limited to this. The cutting portion is only one corner, and the lid is the main body. It may be made continuous with the part and swing with respect to the main body part. Further, in the reinforcing body 22 according to this embodiment, a hollow rectangular tubular body is cut in the extending direction at two corners adjacent to each other, and a thin steel plate is bent into a U shape, and the main body 23 The upper end opening 24 of the portion 23 is provided with a lid portion 25 that covers the lid, but is not limited to this, and as shown in FIG. Connection portions 66 and 67 may be formed on both sides of the thin iron plate 62, and the thin iron plate 62 may be wound around a structure to connect the connection portions 66 and 67.

  FIGS. 8A and 8B are perspective views showing a reinforcing body according to the third embodiment and a modification thereof, respectively. The reinforcing body 42 shown in FIG. 8A is provided with arcuate half pieces 43 and 44 obtained by cutting a hollow cylinder formed of a thin iron plate into a tubular or cylindrical shape at two points in the extending direction. . Connection portions 45 and 46 are formed at corresponding portions at the cut ends of the half pieces 43 and 44, respectively. If these connection parts 45 and 46 are connected, both the half pieces 43 and 44 will become a hollow cylindrical shape. Both the half pieces 43 and 44 may be manufactured in advance based on a construction plan prior to construction on site, or may be manufactured on the basis of dimensions in an already formed structural frame. That is, the hollow cylindrical bodies 43 and 44 to which both the half pieces 43 and 44 are connected are set to have an outer diameter that is substantially the same as or slightly larger than the outer diameter of the column that has already been removed. The length of the hollow cylinders 43 and 44 is set to be substantially the same as or smaller than the length of the cylinder. The half pieces 43 and 44 are applied to the already formed cylinder to connect the connecting portions 45 and 46 to cover the outer periphery of the cylinder. At this time, since the half pieces 43 and 44 are retrofitted, it is inevitable that a gap is generated between the attached hollow cylindrical bodies 43 and 44 and the column. For this reason, a non-shrinkable curable material is filled between the hollow cylinders 43 and 44 and the column and cured, and the hollow cylinders 43 and 44 are fixed to the column. The reinforcing body 42 is coated with an adhesive such as an epoxy resin (not shown) on the outer surfaces of the connected hollow cylindrical bodies 43 and 44, and the carbon fiber sheet 4 is wound around the adhesive surface to cure the adhesive. The cylindrical bodies 43 and 44 and the carbon fiber sheet 4 are integrally joined. Thus, the reinforcing body 42 is provided on the column of the structural housing.

  A reinforcing body 52 shown in FIG. 8B relates to a modification of the reinforcing body 42 according to the third embodiment, and the hollow cylindrical body of the reinforcing body 42 according to the above-described embodiment is an arc-shaped half piece 43. , 44, but differs in that it consists of L-shaped halves 53, 54. The hollow cylinder of the reinforcing body 53 is formed in a square cylinder shape, and is retrofitted to an already molded prism or beam.

  In the reinforcing body 42 according to the third embodiment and the reinforcing body 52 according to the modified example, the thin iron plates 43, 44, 53, 54 are molded in accordance with the already formed columns and beams, and the structural frame is formed on the site. After being attached to the outer surface, the carbon fiber sheet 4 is pasted with an adhesive to form the reinforcing bodies 42 and 53. As described above, in the reinforcing bodies 42 and 52 according to the third embodiment and the modifications thereof, the half pieces 43, 44, 53, and 54 are formed by molding a thin iron plate. It can be molded freely according to the size and shape of the housing, and is lighter, so it can be easily carried to the site. In addition, the amount of the carbon fiber sheet 4 can be freely adjusted and adhered, and the reinforcement performance can be appropriately changed after the structural housing is completed.

  Next, a description will be given of a reinforcing body 102 according to a fourth embodiment of the present invention. As shown in FIG. 10 (A), a reinforcing body 102 according to the fourth embodiment is a lattice substrate or a fibrous substrate (tubular) such as a metal mesh rebar (lattice rebar), geogrid or geotextile. The carbon fiber sheet 4 is affixed to the body 103) (see FIG. 10B), and both sides 106 and 107 of the base material 103 are connected so that the carbon fiber sheet 4 is on the inside (cylindrical). (See FIG. 10C). The reinforcing body 102 is disposed, for example, in the pile hole 5 shown in FIG. 3, and concrete C is placed in the reinforcing body 102 (see FIG. 10D). The cast concrete C penetrates into the fine gaps of the carbon fiber sheet 4 of the reinforcing body 102, and the carbon fiber sheet 4 is wound into the concrete C. Thus, the carbon fiber sheet 4 is arranged on the outer periphery of the concrete pile. The reinforcing body 102 may be formed in a cylindrical shape or a rectangular tube shape so as to match the shape of the structural housing such as a beam or a column, and may be used for the structural housing shown in FIG. 4 or FIG. In the reinforcing body 102 according to this embodiment, immediately before the reinforcing body 102 is suspended in the pile hole 5, an epoxy resin is applied to the outer surface of the reinforcing body 102 and suspended in the pile hole 5 during or after curing of the epoxy resin. It has come down. The concrete pile thus constructed can be improved in strength because the reinforcing body 102 is brought into close contact with the outer periphery of the pile.

  Next, a description will be given of a reinforcing body 112 according to a fifth embodiment of the present invention. As shown in FIG. 11A, the reinforcing body 112 according to the fifth embodiment opens both ends between two metal rings 113A and 113B having a smaller diameter than the pile hole 5 (see FIG. 3). The carbon fiber sleeve (cylindrical body) 114 made of the carbon fiber sheet 4 formed in a cylindrical shape is sandwiched, and the shape of the carbon fiber sleeve 114 is held by the upper and lower rings (holding members) 113 and 113. The reinforcing bar 7 is suspended in the sleeve 114, and the spacer 115 formed on the inner ring 113A is connected to the reinforcing bar 7 (see FIG. 3). That is, a cylindrical carbon fiber sleeve 114 is arranged outside the reinforcing bar 7. The upper and lower rings 113, 113 are provided to maintain the shape of the carbon fiber sleeve 114 that is easily deformed or bent by an external force. Then, as shown in FIG. 12, the reinforcing bar 7 having the sleeve 114 disposed outside is suspended in the pile hole 5, and concrete C is placed in the carbon fiber sleeve 114 to form a concrete pile. It has become. In the reinforcing body 112 according to this embodiment, an epoxy resin is applied to the outer surface of the cylindrical carbon fiber sleeve 114 held by the upper and lower rings 113, 113 immediately before the reinforcing bar 7 is suspended in the pile hole 5. The resin is suspended in the pile hole 5 during or after the resin is cured. The concrete pile thus constructed can be improved in strength because the reinforcing body 112 is in close contact with the outer periphery of the pile.

  Next, a description will be given of a reinforcing body 122 according to a sixth embodiment of the present invention. The reinforcing body 122 according to the sixth embodiment forms a cylindrical carbon fiber sleeve 124 by forming the carbon fiber sheet 4 into a cylindrical sleeve shape having both ends opened (see FIGS. 13A and 13B). The carbon fiber sleeve 124 is impregnated with a sticky hardener (eg, glue, starch paste, mortar, epoxy resin, gelatin, synthetic adhesive, etc.) and hardened to form a desired cylindrical shape. (See FIG. 13C). And this reinforcement body 122 is arrange | positioned on the inner surface of the outer casing pipe 125 for piles. At this time, the lower end 122A of the reinforcing body 122 is seen from the lower end of the outer casing pipe 125 and folded outward. Thus, the outer casing pipe 125 to which the reinforcing body 122 is attached is suspended in the pile hole 5 (see FIG. 14A). Next, the inner casing 126 is suspended inside the reinforcing body 122, and the reinforcing body 122 is sandwiched between the double casings 125 and 126 (see FIG. 14B). Next, after performing the slime treatment, the reinforcing bar 127 is suspended in the inner casing 126 (see FIG. 14C), and concrete C is placed. When the level of the concrete C is increased or after placement, the inner casing 126 is pulled out, and the concrete C and the reinforcing body 122 are brought into contact (see FIG. 14D). At this time, the cast concrete C penetrates into the fine gaps of the carbon fiber sheet 4 of the reinforcing body 122, and the carbon fiber sheet 4 is in close contact with the concrete C. Next, the outer casing 125 is pulled out (see FIG. 14E), and a concrete pile is built (see FIG. 14F). Since the reinforcing body 122 adheres to the pile upper part, the concrete pile constructed in this way can improve the strength, and can reduce the pile diameter and ensure the desired strength. In the reinforcing bodies 102, 112, and 122 according to the fourth to sixth embodiments, both ends of the carbon fiber sheet 4 formed in a tubular shape (tubular shape) are opened, but the present invention is not limited thereto. However, it goes without saying that the bottom may be closed to form a bag.

In each of the above embodiments, either one of a carbon fiber sheet or an aramid fiber sheet is used as the reinforcing fiber sheet. However, the present invention is not limited to this, and a fiber sheet or non-woven fabric that contributes to improvement of earthquake resistance performance. Needless to say, a sheet is sufficient. Further, in each of the above embodiments, the tubular material is configured by an iron material or an iron cylindrical body in which a thin iron plate is formed into a tubular shape, but is not limited thereto, and has high adhesion to concrete (that is, peelability). The material may be any material that is easy to be molded into a tubular or cylindrical shape, and may be a synthetic resin or a cloth material or net material having rigidity. Furthermore, in each said Example, although the carbon fiber sheet 4 is arrange | positioned on the inner surface of a tubular material, it is not restricted to this, You may make it arrange | position on the outer surface or both inner and outer surfaces of a tubular material. Further, in the third embodiment shown in FIG. 8 and its modification, the tubular member of the reinforcing body is composed of two halves, but is not limited to this, and is composed of two or more pieces. You may do it .

1 is an overall view showing a reinforcing body according to a first embodiment of the present invention. Example 1 It is explanatory drawing which expands and shows the principal part of the reinforcement body of FIG. (A) thru | or (G) is explanatory drawing which shows the process of constructing a pile using the reinforcement body of FIG. 1 later on, in order. (A) thru | or (F) is explanatory drawing which shows the process in which a cylinder is built in a structure housing | casing using the reinforcement body of FIG. (A) thru | or (F) is explanatory drawing which shows the process in which a prism is built in a structural housing | casing using the reinforcement body which concerns on the modification of the reinforcement body of FIG. 1, respectively. It is a perspective view which shows the reinforcement body which concerns on the 2nd Example of this invention. (Example 2) (A) to (D) are explanatory views sequentially showing the process of constructing the beam of the structural frame using the reinforcing body of FIG. 6, and (Aa) to (Cc) are respectively (A) to (C) of FIG. The longitudinal cross-sectional view of the formwork in each process of C) is shown. (A), (B) is a perspective view which respectively shows the reinforcement body which concerns on a 3rd Example, and its modification. (Example 3) It is a perspective view which shows the modification of the reinforcement body which concerns on the 2nd Example of this invention. (A) thru | or (C) is explanatory drawing which shows the process of manufacture of the reinforcement body which concerns on the 4th Example of this invention in order, (D) shows the cross section of the pile built using this reinforcement body. It is explanatory drawing. Example 4 It is explanatory drawing which shows the reinforcement body which concerns on the 5th Example of this invention. (Example 5) It is explanatory drawing which shows the cross section of the pile built using the reinforcement body of FIG. (A) thru | or (C) is explanatory drawing which shows the process of manufacture of the reinforcement body which concerns on the 6th Example of this invention in order. (Example 6) (A) thru | or (F) are sectional drawings which show the process of constructing a pile using the reinforcement body of FIG. 13 in order.

Explanation of symbols

2 Reinforcing body 3 Tubular material 4 Carbon fiber sheet (reinforced fiber)

Claims (10)

  1.   In the reinforcement body that reinforces the strength of the structure built by placing concrete, this reinforcement body is formed into a hollow cylinder shape that does not contribute to strength reinforcement and that is easy to mold according to the outer surface side shape of the structure A reinforcing body comprising a reinforcing fiber bonded to the inner surface of the tubular material.
  2.   In Claim 1, it cut | disconnected the tubular material by extending in the extending direction, and provided and provided the connection part in this cutting | disconnection edge part, and bonded the reinforcement fiber to the tubular material inner surface prepared by connecting the connection parts. Reinforcing body characterized by
  3.   The reinforcing body according to claim 1 or 2, wherein the material is made of a thin iron plate.
  4.   4. The reinforcing body according to claim 1, wherein the tubular material has any one of a circular shape, an elliptical shape, and a rectangular shape in cross section.
  5.   In a method for constructing a pile constructed by placing concrete in a pile hole drilled in the ground, the concrete is placed after placing the reinforcing body according to claim 1 in the pile hole. A method of building a pile using a reinforcing body.
  6.   6. The method for constructing a pile according to claim 5, wherein after the reinforcing body is disposed, a reinforcing bar is disposed inside the reinforcing body.
  7.   In a construction method of a structural frame, in which concrete is cast on an installed formwork to construct a structural frame, the reinforcing body according to claim 1 is arranged in contact with the inner surface of the formwork, and the concrete is placed in the reinforcing body. A method for constructing a structural housing characterized by demolding.
  8.   In a reinforcing body that reinforces the strength of a structure built by placing concrete, the reinforcing body has a reinforcing fiber that is formed in a tubular shape with an opening at least at one end, and the reinforcing fiber is held in a desired cylindrical shape. A reinforcing body comprising a holding member.
  9.   In a method for constructing a pile that is constructed by placing concrete in a pile hole drilled in the ground, the concrete is placed after placing the reinforcing body according to claim 8 in the pile hole. A method of building a pile using a reinforcing body.
  10. The method for constructing a pile using the reinforcing body according to claim 9, wherein concrete is placed by placing a reinforcing bar inside the reinforcing body.
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JP5503823B2 (en) * 2009-08-07 2014-05-28 大成建設株式会社 Cast-in-place pile construction method and cast-in-place pile
JP6267885B2 (en) * 2013-07-19 2018-01-24 株式会社フジタ Internal reinforcement type reinforcement method for concrete structures
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JP6219909B2 (en) * 2015-11-19 2017-10-25 株式会社サムシング Ground mountain drainage installation method
KR101636225B1 (en) * 2016-01-20 2016-07-04 정제평 Lateral stiffness reinforced internal reinforced concrete ICP file and its construction method
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