JP2018178497A - Method of placing fiber reinforced concrete, and boundary member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of placing fiber reinforced concrete and a boundary member that can improve strength of a boundary region where one of placing-joint work and placement work in layers of the fiber reinforced concrete is performed.SOLUTION: In a boundary member installation process, a boundary member 1A including reinforcing fiber 2 is installed in a boundary region 12 where fiber-reinforced concrete 17, 18 is placed in contact with hardened concrete, and in a concrete placing process, the fiber-reinforced concrete 17, 18 is placed in a first placing region 13 and a second placing region 14 on both sides of the boundary region 12 where the boundary member 1A is installed in the boundary member installation process, so that the boundary region 12 where the fiber-reinforced concrete 17, 18 is placed in contact with the hardened concrete can be improved in strength.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of placing fiber reinforced concrete and a boundary member.

  Techniques have been proposed for joining or placing concrete. For example, according to Patent Document 1, in a concrete joining form in which a rod-like intumescent water-stopping rubber is attached to the central portion of a net-like stoppering material, the intumescent-off water-blocking rubber is divided into two and fitted together. A concrete joint form has been disclosed which has mating dovetails and ant, and the dovetail and ant fit with each other while sandwiching a net-like stop material between the dovetail and the ant.

Unexamined-Japanese-Patent No. 2-23656

  By the way, fiber reinforced concrete is a material excellent in structural performance such as bending strength and shear strength since reinforcing fibers are mixed in the concrete. However, there is a defect that the boundary portion where either fiber spliced concrete splicing or hitting is performed is inferior in strength to a portion other than the boundary portion, and improvement in the strength of the boundary portion is desired.

  Therefore, an object of the present invention is to provide a method of placing fiber reinforced concrete and a boundary member, which can improve the strength of the boundary where fiber reinforced concrete is subjected to either splicing or laying.

  The present invention relates to a boundary member installation step of setting a boundary member including reinforcing fibers at a boundary portion where either fiber spliced concrete connection or joining is performed, and a boundary portion where the boundary member is installed by the boundary member installation step. And a concrete placing step of placing fiber reinforced concrete on both sides of the fiber reinforced concrete.

  According to this configuration, the boundary member including the reinforcing fiber is installed at the boundary where the fiber-reinforced concrete is subjected to either the joining or the stacking in the boundary member installation process, and the boundary is installed in the boundary member installation process in the concrete placement process. Since fiber reinforced concrete is cast on both sides of the boundary where the member is installed, it is possible to improve the strength of the boundary where the fiber reinforced concrete is either spliced or hit.

  In this case, in the concrete placing step, it is preferable to apply an adhesive to the contact surface of the boundary member in contact with the fiber reinforced concrete before placing the fiber reinforced concrete.

  According to this configuration, in the concrete placing step, the adhesive is applied to the contact surface of the boundary member in contact with the fiber reinforced concrete before placing the fiber reinforced concrete. Thereby, the tensile strength in a contact surface can be improved. In addition, the permeation resistance of the contact surface to deterioration factors such as water and chloride ions can be improved.

  Moreover, in the boundary member installation step, it is preferable to install the boundary member including the penetration reinforcing material that protrudes through the boundary member and protrudes on both sides of the boundary portion.

  According to this configuration, in the boundary member installation step, since the boundary member including the penetration reinforcing material protruding to both sides of the boundary portion while penetrating the boundary member is installed, the tensile strength at the contact surface can be improved.

  In the boundary member installation step, it is preferable to install a boundary member including a non-vertical surface intersecting with the vertical line on the contact surface of the boundary member in contact with the fiber reinforced concrete cast in the concrete placing step.

  According to this configuration, in the boundary member installation step, the boundary member including the non-vertical surface intersecting with the vertical line is installed on the contact surface of the boundary member in contact with the fiber reinforced concrete cast in the concrete placing step. Compared with the case where the contact surface is only a vertical surface, the compressive force and the shear stress from above on the contact surface can be dispersed to improve the strength of the contact surface. Moreover, compared with the case where the contact surface is only the vertical surface, the path through which the deterioration factor such as water or chloride ion penetrates can be lengthened, and the permeation resistance of the contact surface to the deterioration factor can be improved.

  Moreover, in the boundary member installation step, it is preferable to install the boundary member which is a precast member in which the reinforcing fiber is protruded on both sides of the boundary portion.

  According to this configuration, in the boundary member installation step, since the boundary member which is a precast member is installed, the installation of the boundary member is easy. In addition, since the boundary member in which the reinforcing fiber protrudes is installed on both sides of the boundary portion, the reinforcing fiber penetrating through the contact surface of the boundary member in contact with the fiber reinforced concrete cast in the concrete placing step is placed in the concrete placing step Since it is also included in the fiber reinforced concrete casted in the above, the tensile strength at the contact surface can be further improved.

  Moreover, when the boundary member which is a precast member from which reinforcing fibers are projected is installed on both sides of the boundary portion in the boundary member installation step, in the concrete placing step, fiber reinforced concrete is driven on one side of the boundary portion. The fiber reinforced concrete may be cast on the other side of the boundary after the fiber reinforced concrete cast on one side of the boundary is hardened.

  According to this configuration, in the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary, and after the fiber reinforced concrete placed on the one side of the boundary is cured, the other of the boundary is Since fiber reinforced concrete is cast on the side of the frame, fiber reinforced concrete can be spliced on both sides of the boundary portion through the boundary member.

  Alternatively, in the case where a boundary member which is a precast member in which reinforcing fibers are protruded is installed on both sides of the boundary portion in the boundary member installation step, in the concrete placing step, fiber reinforced concrete is cast on one side of the boundary portion. The fiber reinforced concrete may be cast on the other side of the boundary before the fiber reinforced concrete cast on one side of the boundary hardens.

  According to this configuration, in the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary, and before the fiber reinforced concrete placed on the one side of the boundary hardens, Since fiber reinforced concrete is cast on the other side, fiber reinforced concrete can be impacted on both sides of the boundary portion through the boundary member.

  On the other hand, in the boundary member installation step, it is also preferable to install the boundary member which is a concrete before hardening which has a hardness that contains reinforcing fibers and does not cause a shape change due to gravity.

  According to this configuration, in the boundary member installation step, since the boundary member is made of concrete before hardening, which contains reinforcing fibers and has a hardness that does not cause a shape change due to gravity, for example, the floor plate is covered. The boundary member can be easily installed by deforming the boundary member formed of the concrete before hardening corresponding to the unevenness, even on the surface having unevenness such as reinforcing bar exposed by winding. .

  In addition, in the case where the boundary member, which is a concrete before hardening that includes reinforcing fibers and does not cause a shape change due to gravity, is installed in the boundary member installation step, the boundary portion in the concrete placing step is The fiber reinforced concrete is cast on one side of the fiber and the fiber reinforced concrete cast on one side of the boundary and the fiber reinforced concrete cast on one side of the boundary before the boundary member hardens And reinforcing fibers included in any of the boundary members are cast on one side of the boundary portion so as to penetrate the contact surface of the boundary member in contact with the fiber reinforced concrete cast on one side of the boundary portion The reinforced fiber contained in either the fiber reinforced concrete or the boundary member is moved by an external force, and the fiber reinforced concrete and the boundary member placed on one side of the boundary portion are hardened. After that, the washing process exposes the reinforcing fibers contained in the boundary member from the contact surface of the boundary member in contact with the fiber reinforced concrete cast on the other side of the boundary region, and the fiber reinforcement on the other side of the boundary region It is preferable to cast concrete.

  According to this configuration, in the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary, and before the fiber reinforced concrete and the boundary member placed on the one side of the boundary harden. The fiber reinforced concrete cast on one side of the boundary portion and the reinforcing fiber contained in any of the boundary members penetrate the contact surface of the boundary member in contact with the fiber reinforced concrete cast on one side of the boundary portion As the reinforcing fiber contained in either the fiber reinforced concrete or the boundary member cast on one side of the boundary portion is moved by the external force, the fiber reinforcement cast on one side of the boundary portion The tensile strength at the contact surface of the boundary member in contact with concrete can be improved. In the concrete placing step, after the fiber reinforced concrete and the boundary member placed on one side of the boundary are hardened, contact with the fiber reinforced concrete placed on the other side of the boundary by washing out The reinforcing fibers contained in the boundary member are exposed from the contact surface of the boundary member, and fiber reinforced concrete is cast on the other side of the boundary portion. Thus, fiber reinforced concrete cast on the other side of the boundary portion It is possible to improve the tensile strength at the contact surface of the boundary member in contact therewith. Furthermore, fiber reinforced concrete can be spliced on both sides of the boundary region via the boundary member.

  Alternatively, in the case where the boundary member, which is a concrete before hardening that includes reinforcing fibers and does not cause a shape change due to gravity, is installed in the boundary member installation step, the boundary portion in the concrete placing step The fiber reinforced concrete is cast on one side of the fiber and the fiber reinforced concrete cast on one side of the boundary and the fiber reinforced concrete cast on one side of the boundary before the boundary member hardens And reinforcing fibers included in any of the boundary members are cast on one side of the boundary portion so as to penetrate the contact surface of the boundary member in contact with the fiber reinforced concrete cast on one side of the boundary portion Fiber reinforced concrete and boundary member which are moved by an external force by moving reinforcing fibers contained in any of the fiber reinforced concrete and boundary member by an external force Before hardening, place fiber reinforced concrete on the other side of the boundary area, and on the other side of the boundary area before hardening the fiber reinforced concrete and the boundary member placed on the other side of the boundary area At the interface, the reinforcing fibers contained in the cast fiber reinforced concrete and the boundary member penetrate the contact surface of the boundary member in contact with the fiber reinforced concrete cast on the other side of the boundary. It is preferable to move the reinforcing fiber contained in any of the fiber reinforced concrete and the boundary member placed on the other side by an external force.

  According to this configuration, in the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary, and before the fiber reinforced concrete and the boundary member placed on the one side of the boundary harden. The fiber reinforced concrete cast on one side of the boundary portion and the reinforcing fiber contained in any of the boundary members penetrate the contact surface of the boundary member in contact with the fiber reinforced concrete cast on one side of the boundary portion As the reinforcing fiber contained in either the fiber reinforced concrete or the boundary member cast on one side of the boundary portion is moved by the external force, the fiber reinforcement cast on one side of the boundary portion The tensile strength at the contact surface of the boundary member in contact with concrete can be improved. In the concrete placing step, the fiber reinforced concrete is placed on the other side of the boundary before the fiber reinforced concrete and the boundary member placed on the one side of the boundary harden, and the other of the boundary The fiber reinforced concrete cast on one side of the fiber and the fiber reinforced concrete cast on the other side of the boundary before reinforcement of the boundary piece and the reinforcing fibers contained in any of the boundary pieces on the other side of the boundary An external force is applied to the fiber reinforced concrete cast on the other side of the boundary and the reinforcing fiber contained in either of the boundary cast so as to penetrate the contact surface of the boundary cast in contact with the fiber reinforced concrete cast on the side. As a result, the tensile strength at the contact surface of the boundary member in contact with the fiber reinforced concrete cast on the other side of the boundary portion can be improved. In addition, fiber reinforced concrete can be impacted on both sides of the interface through the interface.

  Furthermore, the present invention is a boundary member installed at a boundary where fiber reinforced concrete is subjected to either splicing or hitting, and is a precast member including reinforcing fibers and having reinforcing fibers protruding on both sides of the boundary. And the boundary member.

  In this case, it is preferable to include penetration reinforcements that protrude through the boundary member and project on both sides of the boundary portion.

  Preferably, the contact surface in contact with the fiber reinforced concrete to be cast includes a non-vertical surface intersecting the vertical line.

  According to the casting method and the boundary member of fiber reinforced concrete of the present invention, it is possible to improve the strength of the boundary portion where either the joining or the placing of the fiber reinforced concrete is performed.

(A) is a top view of the boundary member of 1st Embodiment, (B) is sectional drawing by (alpha) line of (A). (A), (B) and (C) is a figure which shows the manufacturing method of the boundary member of FIG. 1 (A) and FIG. 1 (B). It is a top view which shows the boundary member installation process of the placement method of the fiber reinforced concrete of 1st Embodiment. (A) is a cross-sectional view taken along the line β in FIG. 3, (B), (C), (D), (E) and (F) are concrete castings of the method for placing fiber reinforced concrete of the first embodiment It is sectional drawing which shows an installation process. (A) is a cross-sectional view taken along the line β of FIG. 3, (B), (C), (D), (E) and (F) are concrete castings of the method for placing fiber reinforced concrete of the second embodiment It is sectional drawing which shows an installation process. (A) is sectional drawing of the boundary member of 3rd Embodiment, (B) is sectional drawing of the boundary member of 4th Embodiment. (A) is a top view of the boundary member of 5th Embodiment, (B) is sectional drawing by (gamma) ray of (A). It is a top view which shows the boundary member installation process of the placement method of the fiber reinforced concrete of 5th Embodiment. (A) is a cross-sectional view taken along the line δ in FIG. 8; (B), (C), (D), (E), (F), (G) and (H) are fiber reinforcements according to the fifth embodiment It is sectional drawing which shows the concrete pouring process of the casting method of concrete. (A) is a cross-sectional view taken along the line δ in FIG. 8; (B), (C), (D), (E), (F), (G) and (H) are fiber reinforcements according to the sixth embodiment It is sectional drawing which shows the concrete pouring process of the casting method of concrete.

  Hereinafter, a method of placing fiber reinforced concrete according to the present invention and a boundary member will be described in detail with reference to the drawings. As shown in FIG. 1 (A) and FIG. 1 (B), the boundary member 1A of the first embodiment of the present invention is installed at the boundary portion 12 where either fiber splicing concrete joining or hitting is performed. The boundary member 1A is a precast member including the reinforcing fibers 2 and the reinforcing fibers 2 protruding on both sides of the boundary portion 12. The boundary portion 12 may be, for example, a first placement portion 13 where fiber reinforced concrete is placed first, and a second placement portion 14 where fiber reinforced concrete is placed next to the first placement portion 13. Located at the boundary with As shown in FIG. 1 (A), the boundary member 1A extends along the boundary portion 12.

  As shown in FIG. 1 (B), the boundary member 1A has a trapezoidal cross section. The boundary member 1A includes a non-vertical surface 6 intersecting the vertical line at the contact surfaces 3, 4 in contact with the fiber reinforced concrete to be cast. Since the boundary member 1A has a trapezoidal cross section, as both the contact surface 3 facing the first placement site 13 and the contact surface 4 facing the second placement site 14 reach the entire surface upwards It includes a non-vertical surface 6 that slopes to the inside of the boundary member 1A. The reinforcing fiber 2 is a synthetic fiber or steel fiber cut into several [mm] to several [cm]. The boundary member 1A includes the through reinforcements 5 protruding through the boundary member 1A to the first and second placement portions 13 and 14 on both sides of the boundary portion 12. The penetration reinforcement 5 can apply the existing rebar, for example.

  Hereinafter, the manufacturing method of boundary member 1A of this embodiment is explained. As shown in FIG. 2A, a pair of molds 21 and 22 made of expanded polystyrene are arranged to be separated from each other. The molding surface 23 of the mold 21 is inclined corresponding to the contact surface 3 of the boundary member 1A, and the molding surface 24 of the mold 22 is inclined corresponding to the contact surface 4 of the boundary member 1A. A plurality of reinforcing fibers 2 are pierced into the molding surfaces 23 and 24 so as to be easily pulled out with a small force. Further, one end of the plurality of penetration reinforcements 5 is pierced so as to be easily pulled out with a small force on the molding surface 23, and the other end of the plurality of penetration reinforcements 5 is easily pulled out with a small force on the molding surface 24 It is stabbed by Thereby, a plurality of penetration reinforcements 5 are bridged between the molding surface 23 and the molding surface 24.

  As shown in FIG. 2 (B), fiber reinforced concrete 11 is cast between the molding surface 23 and the molding surface 24. As shown in FIG. 2C, the boundary members 1A are manufactured by removing the molds 21 and 22 after curing of the fiber reinforced concrete 11. The reinforcing fibers 2 and the penetrating reinforcing material 5 are pierced so that the reinforcing fibers 2 and the penetrating reinforcing materials 5 can be easily removed from the molding surfaces 23 and 24, so that the ends of the reinforcing fibers 2 and the penetrating reinforcing materials 5 project from the contact surfaces 3 and 4 In the state, it is left on the boundary member 1A.

  Hereinafter, the casting method of the fiber reinforced concrete of this embodiment is demonstrated. In the following example, a case will be described where the floor slab is renewed to a higher strength one by placing fiber reinforced concrete after the existing floor slab is punched. The existing floor slab is scooped by a water jet or the like so as not to damage the rebar embedded in the floor slab.

  As shown in FIG. 3 and FIG. 4 (A), the boundary member installation step is performed in which the boundary member 1A including the reinforcing fiber 2 is installed at the boundary portion 12 where either fiber splicing concrete splicing or batting is performed. . In the present embodiment, fiber reinforced concrete is spliced at the first placement site 13 and the second placement site 14 on both sides of the boundary area 12 via the boundary member 1A. As shown in FIG. 4A, an adhesive 16 such as an epoxy resin-based adhesive is applied to the floor surface 15 of the first placement site 13 and the boundary site 12, and the interface member 1 A is formed on the adhesive 16. Will be installed. In the present embodiment, the floor surface 15 is a flat surface because the floor slab is laid to such a depth that the rebar embedded in the floor slab is not exposed.

  In the boundary member installation step, as described above, the boundary member 1A, which is a precast member from which the reinforcing fiber 2 protrudes, is installed at the first placement site 13 and the second placement site 14 on both sides of the boundary site 12. Further, in the boundary member installation step, the boundary member 1A including the penetration reinforcing members 5 projecting to the first and second placement portions 13 and 14 on both sides of the boundary portion 12 while penetrating the boundary member 1A is installed. . Furthermore, in the boundary member installation step, the boundary member 1A including the non-vertical surface 6 intersecting the vertical line is installed on the contact surfaces 3 and 4 of the boundary member 1A in contact with the fiber reinforced concrete cast in the concrete placing step. .

  As shown in FIG. 4 (B), concrete in which fiber reinforced concrete is placed on the first casting site 13 and the second casting site 14 on both sides of the boundary portion 12 where the boundary member 1A is installed in the boundary member installation step. A placing process is performed. In the concrete placing step, before placing the fiber reinforced concrete, an adhesive 16 such as an epoxy resin based adhesive is applied to the contact surface 3 of the boundary member 1A in contact with the fiber reinforced concrete.

  As shown in FIG. 4C, in the concrete placing step, fiber reinforced concrete 17 is placed in the first placement site 13 on one side of the boundary portion 12. As shown in FIG. 4 (D), after the fiber reinforced concrete 17 placed in the first placement site 13 on one side of the border area 12 hardens, the second placement on the other side of the border area 12 Before placing the fiber reinforced concrete in the part 14, the adhesive 16 such as an epoxy resin adhesive is applied to the contact surface 4 of the boundary member 1A in contact with the fiber reinforced concrete and the floor 15 of the second placement part 14. Be done.

  As shown in FIG. 4 (E), in the concrete placing step, the fiber reinforced concrete 17 placed in the first placement site 13 on one side of the boundary portion 12 hardens, and the contact surface 4 of the boundary member 1A After the adhesive 16 is applied to the floor surface 15 of the second placement site 14, fiber reinforced concrete 18 is placed at the second placement site 14 on the other side of the boundary area 12. As shown in FIG. 4 (F), after the fiber reinforced concrete 18 cast in the second casting site 14 is hardened, the first casting site 13 and the first casting site 13 on both sides of the boundary site 12 via the boundary member 1A. At the second place 14, the fiber reinforced concrete 17, 18 is completely spliced.

  According to the present embodiment, the boundary member 1A including the reinforcing fiber 2 is installed in the boundary portion 12 where the fiber reinforced concrete 17 and 18 are spliced in the boundary member installation step, and the boundary member installation step is performed in the concrete placing step. Since the fiber reinforced concretes 17 and 18 are cast on the first and second placement portions 13 and 14 on both sides of the boundary portion 12 where the boundary member 1A is installed, the fiber reinforced concrete 17 and 18 is spliced. The strength of the boundary 12 to be performed can be improved. In the present embodiment, in particular, when the floor slab is renewed, the fiber reinforced concrete 17, 18 is cast instead of the precast floor slab, so the floor slab can be made higher with less cost and time. It can be updated to a strong one.

  Furthermore, according to the present embodiment, in the concrete placing step, the adhesive 16 is applied to the contact surfaces 3 and 4 of the boundary member 1A in contact with the fiber reinforced concrete 17 and 18 before placing the fiber reinforced concrete 17 and 18. Is applied. Thereby, the tensile strength in the contact surfaces 3 and 4 can be improved. Moreover, the permeation resistance of the contact surfaces 3 and 4 with respect to deterioration factors such as water and chloride ions can be improved.

  Further, according to the present embodiment, in the boundary member installation step, the through reinforcements 5 protruding to the first casting portion 13 and the second casting portion 14 on both sides of the boundary portion 12 while penetrating the boundary member 1A are included. Since the boundary member 1A is installed, the tensile strength at the contact surfaces 3 and 4 can be improved.

  Further, according to the present embodiment, in the boundary member installation step, a non-vertical surface intersecting the vertical line with the contact surfaces 3 and 4 of the boundary member 1A in contact with the fiber reinforced concrete 17 and 18 cast in the concrete placement step. Since the boundary member 1A including 6 is installed, compressive force and shear stress from above on the contact surfaces 3 and 4 are dispersed as compared with the case where the contact surfaces 3 and 4 are only vertical surfaces. , 4 can be improved. In addition, compared with the case where the contact surfaces 3 and 4 are only vertical surfaces, the path through which deterioration factors such as water and chloride ions penetrate is made longer to improve the permeation resistance of the contact surfaces 3 and 4 to the deterioration factors. be able to.

  Further, according to the present embodiment, in the boundary member installation step, since the boundary member 1A which is a precast member is installed, the installation of the boundary member 1A is easy. Further, since the boundary member 1A in which the reinforcing fiber 2 is projected is installed at the first and second placement portions 13 and 14 on both sides of the boundary portion 12, fiber reinforced concrete 17 is placed in the concrete placement step. , 18 are also included in the fiber reinforced concrete 17, 18 cast in the concrete placing step, so that the contact surfaces 3, 4 Can further improve the tensile strength.

  Further, according to the present embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed in the first placing portion 13 on one side of the boundary portion 12, and the first hitting in one side of the boundary portion 12 is performed. Since the fiber reinforced concrete 18 is cast on the second casting portion 14 on the other side of the boundary portion 12 after the fiber reinforced concrete 17 cast on the setting portion 13 is hardened, the boundary via the boundary member 1A Fiber reinforced concrete 17 and 18 can be spliced at the first and second placement sites 13 and 14 on both sides of the location 12.

  Hereinafter, a method of placing fiber reinforced concrete according to a second embodiment of the present invention will be described. In the present embodiment, fiber reinforced concrete is impacted at the first and second placement portions 13 and 14 on both sides of the boundary portion 12 via the boundary member 1A. As shown in FIG. 5A, the boundary member installation step of setting the boundary member 1A on the boundary portion 12 where the fiber reinforced concrete is to be piled up is performed as in the first embodiment.

  As shown in FIG. 5 (B), in the concrete placing step, the contact surface 3 of the boundary member 1A in contact with the fiber reinforced concrete 17 before placing the fiber reinforced concrete 17 as in the first embodiment. The adhesive 16 is applied to the As shown in FIG. 5C, in the concrete placing step, as in the first embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed on the first placement site 13 on one side of the boundary portion 12. Is cast.

  As shown in FIG. 5 (D), in the concrete placing step, before the fiber reinforced concrete 17 placed in the first placement site 13 on one side of the boundary site 12 hardens, the other of the boundary site 12 is hardened. The adhesive 16 is applied to the contact surface 4 of the boundary member 1A in contact with the fiber reinforced concrete 18 and the floor surface 15 of the second cast area 14 before placing the fiber reinforced concrete in the second casting site 14 on the side of It is applied.

  As shown in FIG. 5 (E), in the concrete placing step, before the fiber reinforced concrete 17 placed in the first placing portion 13 on one side of the boundary portion 12 hardens, the boundary member 1A After the adhesive 16 is applied to the contact surface 4 and the floor surface 15 of the second placement site 14, fiber reinforced concrete 18 is placed at the second placement site 14 on the other side of the boundary area 12. As shown in FIG. 5 (F), after the fiber reinforced concrete 17 placed at the first placement site 13 and the fiber reinforced concrete 18 placed at the second placement site 14 harden, the boundary member 1A is The fiber reinforced concretes 17 and 18 are completely impacted at the first and second impacting portions 13 and 14 on both sides of the boundary portion 12.

  According to the present embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed on the first placement site 13 on one side of the boundary site 12, and the first placement site on one side of the boundary site 12 Since the fiber reinforced concrete 18 is placed on the second placement site 14 on the other side of the boundary site 12 before the fiber reinforced concrete 17 placed on 13 hardens, the boundary site via the boundary member 1A The fiber reinforced concretes 17 and 18 can be impacted at the first impact site 13 and the second impact site 14 on both sides of the Twelve.

  Hereinafter, a third embodiment of the present invention will be described. As shown in FIG. 6 (A), the boundary member 1B of this embodiment is a precast member similar to the boundary member 1A of the first embodiment, but both of the contact surfaces 3 and 4 have a contact surface 3, A non-vertical surface 6 which inclines inside the boundary member 1B as it reaches the upper part at the lower part of 4 and inclines as the outer side of the boundary member 1B as it reaches the upper part at the upper part of the non-vertical surface 6 It has a non-perpendicular surface 7 intersecting the line. Similar to the first embodiment and the second embodiment, the boundary member 1B of this embodiment is installed at the boundary portion 12 in the boundary member installation step, and the first strike of both sides of the boundary portion 12 in the concrete placing step Fiber reinforced concretes 17 and 18 are cast in the installation portion 13 and the second casting portion 14.

  In this embodiment, the boundary member 1B including the non-perpendicular surfaces 6 and 7 intersecting the vertical line is installed on the contact surfaces 3 and 4 of the boundary member 1B in contact with the fiber reinforced concrete 17 and 18 cast in the concrete placing step. Therefore, the compressive force and the shear stress from above on the contact surfaces 3 and 4 are dispersed to improve the strength of the contact surfaces 3 and 4 as compared with the case where the contact surfaces 3 and 4 are only vertical surfaces. Can. In addition, compared with the case where the contact surfaces 3 and 4 are only vertical surfaces, the path through which deterioration factors such as water and chloride ions penetrate is made longer to improve the permeation resistance of the contact surfaces 3 and 4 to the deterioration factors. be able to.

  Hereinafter, a fourth embodiment of the present invention will be described. As shown in FIG. 6 (B), the boundary member 1C of this embodiment is a precast member similar to the boundary member 1A of the first embodiment, but the contact surface 3 is the upper part of the boundary member 1C. It has a non-perpendicular surface 8 bent horizontally outward and intersecting the vertical line. In addition, the contact surface 4 has a non-perpendicular surface 8 which is bent in the horizontal direction to the outside of the boundary member 1C at its lower part and intersects the vertical line. Similar to the first embodiment and the second embodiment, the boundary member 1C of the present embodiment is installed at the boundary portion 12 in the boundary member installation step, and the first striking of both sides of the boundary portion 12 in the concrete placing step. Fiber reinforced concretes 17 and 18 are cast in the installation portion 13 and the second casting portion 14.

  In the present embodiment, the boundary member 1C including the non-vertical surface 8 intersecting the vertical line is installed on the contact surfaces 3 and 4 of the boundary member 1C in contact with the fiber reinforced concrete 17 and 18 cast in the concrete placing step. Therefore, as compared with the case where the contact surfaces 3 and 4 are only vertical surfaces, the shear stress on the contact surfaces 3 and 4 and the compressive force from the information on the contact surfaces 3 and 4 in particular are dispersed to the contact surfaces 3 and 4. Can improve the strength of the In addition, compared with the case where the contact surfaces 3 and 4 are only vertical surfaces, the path through which deterioration factors such as water and chloride ions penetrate is made longer to improve the permeation resistance of the contact surfaces 3 and 4 to the deterioration factors. be able to. In particular, in the present embodiment, since the contact surfaces 3 and 4 include the non-perpendicular surface 8 extending in the horizontal direction, the permeation resistance of the contact surfaces 3 and 4 to the deterioration factor can be further improved.

  Hereinafter, a fifth embodiment of the present invention will be described. As shown in FIGS. 7 (A) and 7 (B), the boundary member 1D of the fifth embodiment of the present invention is a boundary portion 12 where either of the joining and hitting of the fiber reinforced concrete 17, 18 is performed. The boundary member 1D installed on the front side of the concrete is a pre-hardened concrete having a hardness that does not cause a shape change due to gravity, including the reinforcing fiber 2. The boundary member 1D includes, for example, reinforcing fibers 2 and is a clay-like fiber reinforced concrete having hardness and viscosity such that no shape change due to gravity occurs before hardening, as shown in FIGS. 7 (A) and 7 (B). It extends along the boundary part 12 as shown to be, and is manufactured by arranging in the shape which has trapezoidal cross section.

  Similar to the boundary member 1A of the first embodiment, the boundary member 1D includes the non-vertical surface 6 intersecting the vertical line at the contact surfaces 3, 4 in contact with the fiber reinforced concrete 17, 18 to be cast. The boundary member 1D of the present embodiment may have the same shape as the boundary member 1B of the third embodiment or the boundary member 1C of the fourth embodiment. Further, similarly to the boundary member 1A of the first embodiment, the boundary member 1D penetrates the boundary member 1A, and penetrates into the first and second impacting portions 13 and 14 on both sides of the boundary portion 12 The reinforcing material 5 is included. The penetration reinforcing material 5 may be inserted into the boundary member 1D before the boundary member 1D is installed in the boundary portion 12 in the boundary member installation step, and the boundary member 1D is installed in the boundary portion 12 in the boundary member installation step. It may be inserted into the boundary member 1D later.

  Hereinafter, the casting method of the fiber reinforced concrete of this embodiment is demonstrated. In the following example, a case will be described where the floor slab is renewed to a higher strength one by placing fiber reinforced concrete after the existing floor slab is punched. The existing floor slab is scooped by a water jet or the like so as not to damage the rebar embedded in the floor slab.

  As shown in FIGS. 8 and 9 (A), a boundary member installation step is performed in which the boundary member 1D including the reinforcing fiber 2 is installed at the boundary portion 12 where either fiber splicing concrete is spliced or batted. . In the present embodiment, the fiber reinforced concretes 17 and 18 are spliced at the first placement site 13 and the second placement site 14 on both sides of the boundary area 12 via the boundary member 1D. In the boundary member installation step, a boundary member 1D which is a pre-hardened concrete having a hardness that does not cause a shape change due to gravity is installed.

  As shown in FIG. 9A, an adhesive 16 such as an epoxy resin-based adhesive is applied to the floor surfaces 15 of the first placement site 13 and the boundary site 12, and a boundary member 1 D is formed on the adhesive 16. Will be installed. In the present embodiment, since the floor slab is scooped to such a depth that the reinforcing bars 19 embedded in the floor slab are exposed, the floor surface 15 is a surface having unevenness. However, in the present embodiment, the boundary member 1D formed of the concrete before hardening is deformed corresponding to the unevenness also to the floor surface 15 having the unevenness.

  As shown in FIG. 9 (B), fiber reinforced concrete 17 is cast in the first casting site 13 and the second casting site 14 on both sides of the boundary portion 12 where the boundary member 1D is installed in the boundary member installation step. A concrete placing process is performed. In the concrete placing step, an adhesive 16 such as an epoxy resin based adhesive is applied to the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 before placing the fiber reinforced concrete. In the present embodiment, application of the adhesive 16 to the contact surface 3 is not essential because the fiber reinforced concrete 17 and the boundary member 1D are not yet hardened. As shown in FIG. 9C, in the concrete placing step, the fiber reinforced concrete 17 is placed in the first placement portion 13 on one side of the boundary portion 12.

  As shown in FIG. 9 (D), in the concrete placing step, before the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement portion 13 on one side of the boundary portion 12 harden, the boundary The first casting portion 13 on one side of the boundary portion 12 of the reinforcing fiber 2 included in any of the fiber reinforced concrete 17 and the boundary member 1D which are placed on the first casting portion 13 on one side of the portion 12 Fiber reinforced concrete 17 and the boundary cast in the first casting site 13 on one side of the boundary portion 12 so as to penetrate the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 cast in the The reinforcing fiber 2 included in any of the members 1D is moved by an external force. For example, in the vicinity of the contact surface 3, the reinforcing fiber 2 is brought into contact with the contact surface 3 by an external force applied by pushing the rod 20 into either the fiber reinforced concrete 17 or the boundary member 1 D or stirring by the rod 20. The reinforcing fibers 2 can be moved to penetrate.

  As shown in FIG. 9 (E), in the concrete placing step, after the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement portion 13 on one side of the boundary portion 12 are hardened, the washing treatment is carried out As a result, the reinforcing fibers 2 included in the boundary member 1D are exposed from the contact surface 4 of the boundary member 1D in contact with the fiber reinforced concrete 18 placed at the second placement portion 14 on the other side of the boundary portion 12. As shown in FIG. 9 (F), in the concrete placing step, before placing the fiber reinforced concrete 18 in the second placing part 14 on the other side of the boundary part 12, the border in contact with the fiber reinforced concrete 18 An adhesive 16 such as an epoxy resin adhesive is applied to the contact surface 4 of the member 1D and the floor surface 15 of the second placement site 14.

  As shown in FIG. 9 (G), in the concrete placing step, the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement portion 13 on one side of the boundary portion 12 harden, and the boundary member 1D After the adhesive 16 is applied to the contact surface 4 and the floor surface 15 of the second placement site 14, fiber reinforced concrete 18 is placed at the second placement site 14 on the other side of the boundary area 12. As shown in FIG. 10 (H), after the fiber reinforced concrete 18 cast in the second casting site 14 is hardened, the first casting site 13 and the first casting site 13 on both sides of the boundary site 12 via the boundary member 1D. At the second place 14, the fiber reinforced concrete 17, 18 is completely spliced.

  In the present embodiment, in the boundary member installation step, since the boundary member 1D, which is concrete before hardening that includes the reinforcing fibers 2 and has a hardness that does not cause a shape change due to gravity, is installed, for example, The boundary member 1D is easily installed by deforming the boundary member 1D formed from the concrete before hardening corresponding to the unevenness, even on the surface having unevenness such as the reinforcing bar 19 exposed by the above. can do.

  Further, in the present embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed in the first placement site 13 on one side of the boundary site 12, and the first placement site on one side of the boundary site 12 Before any of the fiber reinforced concrete 17 and the boundary member 1D cast in 13 hardens, any of the fiber reinforced concrete 17 and the boundary member 1D cast in the first casting site on one side of the boundary portion 12 One of the boundary portions 12 such that the reinforcing fiber 2 contained passes through the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 cast in the first placement portion 13 on one side of the boundary portion 12 Since the reinforcing fiber 2 contained in any of the fiber reinforced concrete 17 and the boundary member 1D which is placed at the first placement site of the side of 1 is moved by the external force, the first placement of the one side of the boundary site 12 Part Tensile strength at the contact surface 3 of the boundary member 1D in contact with the 3 fiber reinforced concrete 17 which is Da設 on can be improved.

  Further, in the present embodiment, in the concrete placing step, after the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement portion 13 on one side of the boundary portion 12 are hardened, the boundary is formed by washing out. The reinforcing fibers 2 included in the boundary member 1D are exposed from the contact surface 4 of the boundary member 1D in contact with the fiber reinforced concrete 18 placed in the second placement portion 14 on the other side of the portion 12, and the boundary portion 12 Since the fiber reinforced concrete 18 is placed on the second placement site 14 on the other side of the frame, the border that contacts the fiber reinforced concrete 18 placed on the second placement site 14 on the other side of the boundary 12 The tensile strength at the contact surface 4 of the member 1D can be improved. Furthermore, the fiber reinforced concretes 17 and 18 can be spliced at the first casting site 13 and the second casting site 14 on both sides of the boundary site 12 via the boundary member 1D.

  Hereinafter, a method of placing fiber reinforced concrete according to a second embodiment of the present invention will be described. In the present embodiment, fiber reinforced concrete is impacted at the first and second placement portions 13 and 14 on both sides of the boundary portion 12 via the boundary member 1D. As shown in FIG. 10A, the boundary member installation step of setting the boundary member 1D to the boundary portion 12 where the fiber reinforced concrete is to be piled up is performed as in the fifth embodiment.

  As shown in FIG. 10B, in the concrete placing step, the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 before placing the fiber reinforced concrete 17 as in the fifth embodiment. The adhesive 16 is applied to the In the present embodiment, application of the adhesive 16 to the contact surface 3 is not essential because the fiber reinforced concrete 17 and the boundary member 1D are not yet hardened. As shown in FIG. 10C, in the concrete placing step, as in the fifth embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed on the first placement site 13 on one side of the boundary portion 12. Is cast.

  As shown in FIG. 10 (D), in the concrete placing step, as in the fifth embodiment, the fiber reinforced concrete 17 placed at the first placement site 13 on one side of the boundary site 12 and the border Before the member 1D is cured, the fiber reinforced concrete 17 placed in the first placement site 13 on one side of the border area 12 and the reinforcing fiber 2 included in either of the border member 1D are one side of the border area 12 The first casting portion 13 on one side of the boundary portion 12 is driven so as to penetrate the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 driven to the first casting portion 13 on the side of The reinforcing fiber 2 included in any of the provided fiber reinforced concrete 17 and the boundary member 1D is moved by an external force using a rod 20 or the like.

  As shown in FIG. 10 (E), in the concrete placing step, the border in contact with the fiber reinforced concrete 18 before placing the fiber reinforced concrete 18 in the second placement site 14 on the other side of the boundary part 12 An adhesive 16 such as an epoxy resin adhesive is applied to the contact surface 4 of the member 1D and the floor surface 15 of the second placement site 14. In the present embodiment, since the fiber reinforced concrete 18 and the boundary member 1D are not yet hardened, the application of the adhesive 16 to the contact surface 4 is not essential. As shown in FIG. 10 (F), in the concrete placing step, before the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement part 13 on one side of the boundary part 12 harden, the boundary Fiber reinforced concrete 18 is placed in the second placement site 14 on the other side of the site 12.

  As shown in FIG. 10 (G), in the concrete placing step, before the fiber reinforced concrete 18 and the boundary member 1D placed in the second placement part 14 on the other side of the boundary part 12 harden, the boundary The second casting portion 14 of the other side of the boundary portion 12 is the reinforcing fiber 2 included in any of the fiber reinforced concrete 18 and the boundary member 1D which are placed in the second casting portion 14 of the other side of the portion 12 Fiber reinforced concrete 18 and the boundary cast in the second casting site 14 on the other side of the boundary portion 12 so as to penetrate the contact surface 4 of the boundary member 1D in contact with the fiber reinforced concrete 18 cast in the The reinforcing fiber 2 included in any of the members 1D is moved by an external force. For example, in the vicinity of the contact surface 4, the reinforcing fiber 2 is brought into contact with the contact surface 4 by an external force applied by pushing the rod 20 into either of the fiber reinforced concrete 18 and the boundary member 1 D or stirring by the rod 20. The reinforcing fibers 2 can be moved to penetrate.

  As shown in FIG. 10 (H), after the boundary member 1D, the fiber reinforced concrete 17 cast on the first placement site 13 and the fiber reinforced concrete 18 placed on the second placement site 14 harden, The striking of the fiber reinforced concretes 17 and 18 is completed at the first placement site 13 and the second placement site 14 on both sides of the boundary area 12 via the boundary member 1D.

  According to the present embodiment, in the concrete placing step, the fiber reinforced concrete 17 is placed on the first placement site 13 on one side of the boundary site 12, and the first placement site on one side of the boundary site 12 Before any of the fiber reinforced concrete 17 and the boundary member 1D cast in 13 hardens, any of the fiber reinforced concrete 17 and the boundary member 1D cast in the first casting portion 13 on one side of the boundary portion 12 Of the boundary portion 12 so that the reinforcing fibers 2 contained therein penetrate through the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 placed in the first placement portion 13 on one side of the boundary portion 12 Since the reinforcing fiber 2 contained in any of the fiber reinforced concrete 17 and the boundary member 1D which is placed in the first placement site 13 on one side is moved by an external force, the first side of the boundary site 12 Strike It is possible to improve the tensile strength in the contact surface 3 of the boundary member 1D in contact with the fiber reinforced concrete 17 which is Da設 to the site 13.

  Moreover, according to the present embodiment, in the concrete placing step, the border part is not formed before the fiber reinforced concrete 17 and the boundary member 1D placed in the first placement part 13 on one side of the border part 12 are hardened. Fiber reinforced concrete 18 is placed in the second placement site 14 on the other side of 12, and fiber reinforced concrete 18 and the boundary member 1D placed in the second placement site 14 on the other side of the boundary area 12 Before hardening, the reinforcing fiber 2 included in any of the fiber reinforced concrete 18 and the boundary member 1D which is placed in the second placement site 14 on the other side of the boundary site 12 is placed on the other side of the boundary site 12 The second casting portion 14 is driven on the other side of the boundary portion 12 so as to penetrate the contact surface 4 of the boundary member 1D in contact with the fiber reinforced concrete 18 driven to the second casting portion 14 Fiber reinforced concrete Since the reinforcing fiber 2 included in either of 18 and the boundary member 1D is moved by external force, the boundary member in contact with the fiber reinforced concrete 18 cast in the second casting site 14 on the other side of the boundary site 12 The tensile strength at the contact surface 4 of 1D can be improved. Furthermore, the fiber reinforced concretes 17 and 18 can be impacted at the first and second impacting portions 13 and 14 on both sides of the boundary portion 12 through the boundary member 1D.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, in the above embodiment, the case where the floor slab is renewed is mainly described. However, in addition to the case where the floor slab is renewed, the case where either the fiber reinforced concrete joining or striking is performed is performed. Applicable to

  1A, 1B, 1C, 1D: boundary member, 2: reinforcing fiber, 3, 4: contact surface, 5: penetrating reinforcing material, 6, 7, 8: non-vertical surface, 11: fiber reinforced concrete, 12: boundary portion, 13 ... 1st placement site, 14 ... 2nd placement site, 15 ... floor surface, 16 ... adhesive, 17, 18 ... fiber reinforced concrete, 19 ... rebar, 20 ... rod, 21, 22 ... formwork, 23 , 24 ... molding surface.

Claims (13)

A boundary member setting step of setting a boundary member containing reinforcing fibers at a boundary where fiber reinforced concrete is subjected to either a joining or a lap;
Concrete placing step of placing the fiber reinforced concrete on both sides of the boundary portion where the boundary member is installed by the boundary member installing step;
Method of fiber reinforced concrete equipped with   2. The fiber reinforced concrete casting according to claim 1, wherein an adhesive is applied to a contact surface of the boundary member in contact with the fiber reinforced concrete before the fiber reinforced concrete is cast in the concrete placing step. Method.   The method for placing fiber reinforced concrete according to claim 1 or 2, wherein in the boundary member installation step, the boundary member including a penetration reinforcing material protruding to both sides of the boundary portion is installed while penetrating the boundary member.   In the boundary member installation step, the boundary member including a non-vertical surface intersecting with a vertical line is installed on the contact surface of the boundary member in contact with the fiber reinforced concrete cast in the concrete placing step. The casting method of the fiber reinforced concrete of any one of -3.   The method for placing fiber reinforced concrete according to any one of claims 1 to 4, wherein, in the boundary member installation step, the boundary member which is a precast member from which the reinforcing fiber protrudes is installed on both sides of the boundary portion. .   In the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary, and after the fiber reinforced concrete placed on the one side of the boundary is cured, the other of the boundary is The method for placing fiber reinforced concrete according to claim 5, wherein the fiber reinforced concrete is placed on the side of the frame.   In the concrete placing step, the fiber reinforced concrete is placed on one side of the boundary area, and before the fiber reinforced concrete placed on one side of the boundary area is hardened, The method for placing fiber reinforced concrete according to claim 5, wherein the fiber reinforced concrete is placed on the other side.   The boundary member installation step according to any one of claims 1 to 4, wherein in the boundary member installation step, the boundary member is concrete before hardening which has the hardness such that it does not cause a shape change due to gravity, including the reinforcing fiber. Method of casting fiber reinforced concrete as described in the above. In the concrete placing process,
The fiber reinforced concrete is cast on one side of the boundary portion,
Before any of the fiber reinforced concrete cast on one side of the boundary portion and the boundary member, the fiber reinforced concrete cast on one side of the boundary portion and the boundary member The casted on one side of the boundary portion such that the reinforcing fibers contained pass through the contact surface of the boundary member in contact with the fiber-reinforced concrete cast on one side of the boundary portion The reinforcing fiber contained in any of the fiber reinforced concrete and the boundary member is moved by an external force,
After the fiber reinforced concrete cast on one side of the boundary portion and the boundary member harden, the boundary in contact with the fiber reinforced concrete cast on the other side of the boundary portion by washing out Exposing the reinforcing fibers contained in the boundary member from the contact surface of the member;
The method according to claim 8, wherein the fiber reinforced concrete is cast on the other side of the boundary portion. In the concrete placing process,
The fiber reinforced concrete is cast on one side of the boundary portion,
Before any of the fiber reinforced concrete cast on one side of the boundary portion and the boundary member, the fiber reinforced concrete cast on one side of the boundary portion and the boundary member The casted on one side of the boundary portion such that the reinforcing fibers contained pass through the contact surface of the boundary member in contact with the fiber-reinforced concrete cast on one side of the boundary portion The reinforcing fiber contained in any of the fiber reinforced concrete and the boundary member is moved by external force,
The fiber reinforced concrete is cast on the other side of the boundary portion before the fiber reinforced concrete cast on one side of the boundary portion and the boundary member harden.
Before any of the fiber reinforced concrete cast on the other side of the boundary portion and the boundary member, the fiber reinforced concrete cast on the other side of the boundary portion and the boundary member The said reinforcement fiber included in the other side of the boundary portion so as to penetrate through the contact surface of the boundary member in contact with the fiber reinforced concrete placed on the other side of the boundary portion The method for placing fiber reinforced concrete according to claim 8, wherein the reinforcing fiber contained in any of the fiber reinforced concrete and the boundary member is moved by an external force. A boundary member installed at a boundary where fiber reinforced concrete is subjected to either joining or hitting,
A boundary member comprising a reinforcing fiber, wherein the reinforcing fiber is a precast member protruding on both sides of the boundary portion.   The boundary member according to claim 11, comprising a penetration reinforcing member which protrudes through the boundary member according to claim 11 on both sides of the boundary portion.   The boundary member according to claim 11 or 12, wherein the contact surface in contact with the fiber reinforced concrete to be cast includes a non-vertical surface intersecting a vertical line.

Images