JP2011084861A - Stainless steel-reinforced embedded form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thinner embedded form which provides enhanced durability and earthquake resistance of a structure and whose structures of form joints transmit tensile force. <P>SOLUTION: Stainless steel reinforcements are arranged crosswise in a form body 2 which is made of a concrete-based molded article; a tensile force transfer structure is provided in the joint between the adjacent embedded form bodies: and the longitudinal and lateral stainless steel reinforcements are used as part of the main reinforcement and a hoop tie in a design of a reinforced concrete structure or a steel-framed reinforced concrete structure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a cement-based mortar (hereinafter referred to as “base mortar”) is used as a base material, and stainless steel reinforcing bars (hereinafter referred to as “stainless steel reinforcing bars”) are disposed in two vertical and horizontal directions as reinforcing materials. Regarding formwork.

  The buried formwork functions as a formwork when placing concrete to build a concrete frame, and after the poured concrete has hardened, it functions as a part of the concrete frame, eliminating the need for demolding work. Contributes to the rationalization of concrete frame construction work.

  The buried form has a function as a forming form at the time of placing concrete and a function as a part of the structure. An embedded form as a structure forming form must have a strength that can withstand a lateral pressure during concrete pouring. Therefore, a method of reinforcing by mixing fibers made of stainless steel, steel, or vinylon is being implemented.

JP 2002-256640 A

However, the embedded formwork mixed with various fibers such as stainless steel fiber, steel fiber, and vinylon fiber as a reinforcing material has sufficient strength to withstand the side pressure when placing concrete, but the joint between adjacent formwork is buried. It has a structure that cannot transmit the tensile force acting on the formwork. For this reason, the conventional embedded formwork does not have a function of improving the durability of the entire structure.

  Recently, even in the embedded formwork, performance that contributes to the durability and earthquake resistance of the structure has been required. In order to contribute to improving the durability and seismic resistance of the structure, the reinforcement method that reinforces the reinforcing bars in the embedded formwork must prevent corrosion of the reinforcing bars due to the invasion of corrosive factors from surface cracks. The thickness of the cover concrete has to be increased and cannot be employed as an embedded formwork that requires a thinner wall. For example, when ordinary reinforcing bars are used, reinforcing steel cover is required to be 30 mm or more to prevent corrosion of the reinforcing bars. If deformed steel bars with a diameter of 10 mm are arranged in two vertical and horizontal directions as reinforcing bars, the thickness of the embedded formwork needs to be 80 mm or more. It becomes. Furthermore, when using the embedded formwork in a severe salt damage environment, it is necessary to make the reinforcing bar cover larger. For this reason, it is unrealistic to arrange reinforcing bars in the embedded formwork because it leads to an increase in transportation cost accompanying a weight increase of the formwork and a decrease in construction efficiency on site.

  The present invention solves the above-mentioned problems of the prior art, can improve the durability and proof stress of the structure while realizing thinning, and has a structure in which a joint between molds transmits a tensile force. The purpose is to provide embedded formwork.

  In order to solve the above-mentioned problem, the stainless steel reinforcing bar embedded formwork of the present invention has stainless steel reinforcing bars arranged vertically and horizontally in a formwork body made of a concrete-based molded body, and is pulled at a joint between adjacent formwork bodies. It is provided with a force transmission structure.

  Further, the stainless steel reinforcing bar embedded formwork of the present invention is arranged such that both ends of the vertical and horizontal stainless steel reinforcing bars in the mold body are directed to the inside of the mold main body, and the both ends of the vertical and horizontal stainless steel reinforcing bars are A fixed length is exposed from the inside of the end of the mold body, and the exposed portions of the vertical and horizontal stainless steel bars serve as a lap joint of the joint portions of the adjacent mold bodies.

  Further, the stainless steel reinforcing bar embedded formwork of the present invention, the both ends of the vertical and horizontal stainless steel reinforcing bars in the formwork body are stopped in the formwork body, and between the formwork bodies adjacent to each other inside the formwork body. It is characterized by attaching a holding portion of a supplementary bar to be arranged at the joint portion.

  Moreover, the stainless steel reinforcing bar embedded form according to the present invention is characterized in that the vertical and horizontal stainless steel reinforcing bars are used as a part of main reinforcing bars and belt reinforcing bars in the design of a reinforced concrete structure or a steel reinforced concrete structure.

  Further, the stainless steel reinforcing bar embedded form according to the present invention is characterized in that the stainless steel reinforcing bar is a deformed steel bar.

  Moreover, the stainless steel reinforcement reinforced buried form of the present invention is formed by using a mortar cement or a normal Portland cement and a blast furnace cement as the cement in which the water-cement ratio of the base material mortar of the form body is 25 to 55%. It is characterized by.

  Moreover, the stainless steel reinforcement reinforced embedded form of the present invention is characterized in that an expansion material is mixed into the base material mortar, and a prestressing force is introduced through the stainless steel reinforcement arranged vertically and horizontally in the form body. To do.

By using a stainless steel bar having excellent corrosion resistance as a reinforcing material, the thickness of the cover concrete can be reduced, and the thickness can be reduced while increasing the strength of the formwork body.
In addition, by using vertical and horizontal stainless steel reinforcing bars as part of main reinforcing bars and strip reinforcing bars in the design of reinforced concrete structures and steel reinforced concrete structures, the embedded formwork itself can function as part of the structural strength design. It becomes possible.
Further, both end portions of the vertical and horizontal stainless steel bars in the mold body are arranged so as to face the inside of the mold body, and the both end portions of the vertical and horizontal stainless steel bars are exposed for a certain length from the inside of the end portion of the mold body. By doing so, it becomes possible to prevent the interference between the stainless steel rebars at the joint part of the embedded formwork and to bring the joint parts into close contact with each other. It is possible to form a structure in which a lap joint is constituted by the portion, and a joint portion of the embedded formwork transmits a tensile force.
In addition, both ends of the vertical and horizontal stainless steel reinforcing bars in the formwork main body are stopped in the formwork main body, and a holding portion of a supplementary bar arranged at a joint portion between adjacent formwork main bodies is attached inside the formwork main body. Thus, it is possible to adopt a structure in which the joint portion between adjacent mold body bodies transmits the tensile force.
In addition, by using vertical and horizontal stainless steel rebar as part of the main rebar and strip rebar in the design of reinforced concrete structures and steel reinforced concrete structures, the embedded formwork itself can function as part of the structural strength design. It becomes possible.
Moreover, it becomes possible to improve the adhesiveness of the concrete-type member and stainless steel reinforcing bar at the time of mold body forming by using a deformed steel bar as the stainless steel reinforcing bar.
In addition, by reducing the water cement ratio of the base material mortar of the mold body and molding it with blast furnace cement, the diffusion coefficient can be reduced, and the infiltration resistance of chloride ions in a salt damage environment is increased. And can be advantageous in application to construction in a salt damage environment.
Moreover, it becomes possible to make an embedded formwork thin by introducing a prestress using the stainless steel reinforcing bar arranged inside and outside using an expansion material at the time of manufacture of an embedded formwork.

It is a figure which shows one Embodiment of the embedded formwork of this invention. (A) (b) It is a figure which shows other embodiment of the embedded formwork of this invention. It is a figure which shows the joining state of the embedded formwork of this invention. It is a figure which shows the joining state of the embedded formwork of this invention. It is a figure which shows the joining state of the embedded formwork of this invention. It is a figure which shows the joining state of the embedded formwork of this invention. It is a figure which shows the joining state of the embedded formwork of this invention. (A) (b) It is a figure which shows the joining state of the embedded formwork of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an embodiment of an embedded form 1 of the present invention.

  The embedded mold 1 has a mold body 2 made of a concrete-based molded body. In the mold body 2, vertical stainless steel bars 3 and horizontal stainless steel bars 4 are arranged at predetermined intervals as vertical reinforcing bars and horizontal reinforcing bars. Since the vertical and horizontal stainless steel rebars 3 and 4 have high anticorrosion properties, the thickness of the cover concrete can be reduced, and the thickness of the embedded formwork 1 can be reduced.

  In the embedded mold 1 of this embodiment, both end portions of the vertical and horizontal stainless steel rebars 3 and 4 are exposed from the end portion of the mold body 2 by a predetermined length. The operation and effect of the vertical stainless steel bar exposed portion 3a and the horizontal stainless steel bar exposed 4a exposed from the end of the mold body 2 by a predetermined length will be described later.

  FIGS. 2A and 2B are views showing another embodiment of the embedded formwork of the present invention. In the embedded form 1 of this embodiment, both ends of the longitudinal and lateral stainless steel rebars 3 and 4 are positioned in the form body 2.

  The mold body 2 is a high-strength mortar in which the water-cement ratio of the base mortar is 55% or less when a general structure is a target, and 25% is the lower limit when a structure requiring durability is a target. To mold. Furthermore, by using a blast furnace cement as the cement used, a concrete-based molded body having a small diffusion coefficient and high salt damage resistance can be obtained. The embedded form 1 molded in this way can increase the resistance of chloride ions to enter in a salt-damaged environment, and can be used to construct a structure in a salt-damaged environment from the viewpoint of dramatically improving durability. Suitable for

  Prestress (compression force) is introduced into the formed embedded mold 1 through the longitudinal and horizontal stainless steel rebars 3 and 4 by adding an expansion material to the cement-based material at the time of forming the embedded mold. This makes it possible to reduce the thickness of the embedded mold 1.

  It is preferable to use deformed steel bars for the longitudinal and lateral stainless steel rebars 3 and 4 disposed in the mold body 2. By making the vertical and horizontal stainless steel rebars 3 and 4 into deformed bar steel, the adhesion performance with concrete is improved.

  FIG. 3 is a view showing an example of joining the embedded molds 1 and 1 of the embodiment shown in FIG. 1 in the lateral direction. At the joint portions of the embedded molds 1 and 1, the lateral stainless steel bar exposed portions 4a exposed from the mold body 2 of the horizontal stainless steel bars 4 of the respective embedded molds 1 are overlapped, and the double joint of the double stainless steel reinforcing bar amount. Therefore, the strength of the joint portion of the embedded mold 1 can be increased, and a structure in which the adjacent embedded molds 1 transmit a tensile force to each other can be obtained. Although FIG. 3 shows an example in which the embedded form 1 is joined in the horizontal direction, the same applies to the case where the embedded form 1 is joined in the vertical direction.

  FIG. 4 is a diagram showing an example of joining the embedded mold 1 in the lateral direction when the mold body 2 of the embedded mold 1 of the embodiment shown in FIG. Assuming that the outer side 2a of the mold body 2 is the side that will be the surface of the structure to be constructed, and the inner side 2b of the mold body 2 is the side on which the concrete is placed for the construction of the structure, The directional stainless steel bars 3 and 4 are arranged so as to approach the inner side 2b of the formwork body 2 as they go to the longitudinal and lateral ends of the formwork body 2. The vertical stainless steel bar exposed portion 3a and the horizontal stainless steel bar exposed portion 4a are exposed for a predetermined length from the inner side of the end of the mold body 2 and extend in parallel along the inner side of the mold body 2 after exposure. Placed in. By exposing the vertical stainless steel reinforcing bar exposed part 3a and the horizontal stainless steel reinforcing bar exposed part 4a from the inside of the end of the mold body 2, the vertical stainless steel reinforcing bar exposed part 3a and the horizontal stainless steel reinforcing bar exposed part 4a are joined at the joint. By overlapping, the joint portion becomes a double joint with a double stainless steel reinforcing bar amount, the strength of the joint portion of the embedded mold 1 is increased, and the adjacent mold body 2 transmits a tensile force. Moreover, a joining part can be closely_contact | adhered, without the vertical direction stainless steel rebar exposure part 3a and the horizontal direction stainless steel rebar exposure part 4a interfering in the joining part of the adjacent formwork main body 2. FIG. Although FIG. 4 shows an example in which the embedded form 1 is joined in the horizontal direction, the same applies to the case where the embedded form 1 is joined in the vertical direction.

  FIG. 5 is a diagram showing another example of joining the embedded mold 1 in the lateral direction when the mold body 2 of the embedded mold 1 of the embodiment shown in FIG. 1 is flat. In this example, the vertical and horizontal stainless steel rebars 3 and 4 are arranged so as to approach the inner side 2b of the mold body 2 as they go to the longitudinal and lateral ends of the mold body 2. In this example, the vertical stainless steel bar exposed portion 3a and the horizontal stainless steel bar exposed portion 4a that are exposed from the inner side of the end of the mold body 2 are arranged to extend in an oblique direction. Since the vertical stainless steel bar exposed portion 3a and the horizontal stainless steel bar exposed portion 4a are exposed in an oblique direction, the fixing property with the concrete placed inside the mold body 2 is improved. By joining the vertical stainless steel rebar exposed part 3a and the horizontal stainless steel rebar exposed part 4a at the joint, the joint becomes a double joint of the amount of stainless steel rebar, and the strength of the joint of the embedded form 1 is increased. Adjacent mold body 2 has a structure for transmitting a tensile force. Moreover, a joining part can be closely_contact | adhered, without the vertical direction stainless steel rebar exposure part 3a and the horizontal direction stainless steel rebar exposure part 4a interfering in the joining part of the adjacent formwork main body 2. FIG. Although FIG. 5 shows an example in which the embedded form 1 is joined in the horizontal direction, the same applies to the case where the embedded form 1 is joined in the vertical direction.

  FIG. 6 is a diagram showing an example in which the embedded mold 1 is joined in the lateral direction when the mold body 2 of the embedded mold 1 of the embodiment shown in FIG. 1 has an arc shape. Even when the shape of the formwork body is an arc shape, the arrangement configuration of the vertical and horizontal stainless steel rebars 3 and 4, the configuration of the vertical stainless steel reinforcing bar exposed portion 3a and the configuration of the horizontal stainless steel reinforcing bar exposed portion 4a, actions and effects are 4 and 5 are the same as the case where the mold body 2 shown in FIG. Since the difference in the shape of the mold body 2 varies depending on the structure to be constructed, the shape of the embedded mold 1 of the present invention is not limited to the shape shown in the figure.

  FIG. 7 is a diagram showing an example of joining the embedded mold 1 in the lateral direction when the mold body 2 of the embedded mold 1 of the embodiment shown in FIG. In this example, the spiral muscle 6 is embedded and fixed in the mold body 2 so that a part of the inner side 2b of the mold body 2 is exposed. The spiral line 6 exposed inside the mold body 2 functions as a holding part for the accessory bar 5 arranged at the joint between adjacent mold bodies. Since the splicing bar 5 is held by the spiral streaks 6 at the joints between the adjacent formwork bodies, the strength of the joint part of the embedded formwork 1 is increased, and the adjacent formwork main bodies 2 are pulled to each other. It becomes a structure to transmit. Although FIG. 7 shows an example in which the embedded form 1 is joined in the horizontal direction, the same applies to the case where the embedded form 1 is joined in the vertical direction.

  FIG. 8 is a diagram showing another example of joining the embedded mold 1 in the horizontal direction when the mold body 2 of the embedded mold 1 of the embodiment shown in FIG. In this example, the U-shaped line 7 is embedded and fixed in the mold body 2 so that a part thereof is exposed on the inner side 2 b of the mold body 2. The U-shaped muscle 7 exposed on the inner side of the mold body 2 functions as a holding portion for the accessory muscle 5 arranged at the joint portion between the adjacent mold body bodies. By arranging the accessory bar 5 by being held by the U-shaped line 7 at the joint part between the adjacent formwork bodies, the strength of the joint part of the embedded formwork 1 is increased, and the adjacent formwork bodies 2 are pulled together. A structure that transmits force. Although FIG. 7 shows an example in which the embedded form 1 is joined in the horizontal direction, the same applies to the case where the embedded form 1 is joined in the vertical direction.

  The embedded form 1 of the present invention can be used for various applications. For example, the embedded formwork 1 of the present invention is arranged on the outer periphery of an existing pier, the outer periphery of the existing pier and the inside of the embedded formwork 1 are filled with a solidifying material, and the existing pier and the embedded formwork 1 are integrated into an existing The durability and earthquake resistance of the pier can be improved.

  Further, the embedded formwork 1 of the present invention can be arranged on the bottom or top surface of an existing floor slab and used as an integral part in the floor slab thickening method.

  As described above, with the configuration of the embedded form 1 of the present invention, the thickness of the cover concrete can be reduced by using a stainless steel rebar having excellent corrosion resistance as a reinforcing material, and the pre-stress is introduced by the expansion material. It is possible to reduce the thickness while increasing the strength of 2 and use the vertical and horizontal stainless steel rebars 3 and 4 as part of the main rebar and strip rebar in the design of reinforced concrete structures and steel reinforced concrete structures. The mold itself functions as part of the strength design of the structure, the joint between the mold bodies can be structured to transmit the tensile force between the embedded molds, and the stainless steel bar is a deformed steel bar This improves the adhesion between the concrete-based member and the stainless steel rebar during molding of the mold body, reduces the water-cement ratio of the base material mortar of the mold body, By forming with blast furnace cement, the diffusion coefficient can be reduced, the infiltration resistance of chloride ions in a salt damage environment can be increased, and it is superior in application to structures in a salt damage environment, By introducing prestress using stainless steel reinforcing bars arranged vertically and horizontally using an expanding material during the manufacturing of the embedded mold, it is possible to reduce the thickness of the embedded mold.

  1: Embedded formwork, 2: Formwork body, 2a: Outside of formwork body, 2b: Inside of formwork body, 3: Longitudinal stainless steel rebar, 3a: Longitudinal stainless steel bar exposed part, 4: Horizontal stainless steel bar 4a: laterally exposed stainless steel bar exposed portion, 5: splicing bar, 6: spiral bar, 7: U-shaped bar

Claims (7)

  A stainless steel reinforcement reinforcing embedded form, wherein stainless steel reinforcing bars are arranged vertically and horizontally in a formwork body made of a concrete-based molded body, and a tensile force transmission structure is provided at a joint between adjacent formwork bodies.   The both ends of the vertical and horizontal stainless steel bars in the mold body are arranged so as to face the inside of the mold body, and the both ends of the vertical and horizontal stainless steel bars are exposed for a certain length from the inside of the edge of the mold body. The exposed portion of the vertical and horizontal stainless steel reinforcing bars is used as a lap joint of the joint portions of the adjacent mold body main bodies.   The both ends of the vertical and horizontal stainless steel reinforcing bars in the formwork body are stopped in the formwork body, and the holding portions of the accessory bars arranged at the joints between the formwork bodies adjacent to the inside of the formwork body are attached. The stainless steel reinforcement reinforcement embedding form of Claim 1 characterized by these.   The stainless steel reinforcing bar embedment according to any one of claims 1 to 3, wherein the vertical and horizontal stainless steel reinforcing bars are used as part of main reinforcing bars and strip reinforcing bars in the design of a reinforced concrete structure or a steel reinforced concrete structure. Formwork.   The stainless steel reinforcing bar embedded form according to any one of claims 1 to 4, wherein the stainless steel reinforcing bar is a deformed steel bar.   6. The water base of the base material mortar of the mold body is 25 to 55%, and the cement is formed using blast furnace cement or ordinary Portland cement and blast furnace cement. The stainless steel reinforcement reinforcement embedding form of description.   The expansion | swelling material is mixed in the said cement-type member, A prestress force is introduce | transduced through the said stainless steel rebar arrange | positioned in the said mold main body vertically and horizontally. Stainless steel reinforcement reinforced buried formwork.

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