JP6949699B2 - Manufacturing method of fiber reinforced concrete member, manufacturing method of sacrificial formwork and fiber reinforced concrete member - Google Patents

Description

The present invention relates to a method for manufacturing a fiber reinforced concrete member, a method for manufacturing a sacrificial formwork, and a fiber reinforced concrete member.

Techniques for concrete splicing have been proposed. For example, in Patent Document 1, in a concrete joint formwork in which a rod-shaped expandable water stop rubber is attached to the central portion of a net-like stop material, the expandable water stop rubber is divided into two and fitted to each other. A concrete joint formwork having a matching dovetail groove and an ant and in which the dovetail groove and the ant fit each other while sandwiching a net-like stopper material between the dovetail groove and the ant is disclosed.

Japanese Unexamined Patent Publication No. 2-23656

By the way, fiber reinforced concrete is a material having excellent structural performance such as bending strength and shear strength because reinforcing fibers are mixed in the concrete. However, the boundary surface to which the fiber reinforced concrete is joined has a drawback that the strength is inferior to that of a portion other than the boundary surface, and improvement in the strength of the boundary surface is desired.

Therefore, an object of the present invention is to provide a method for manufacturing a fiber reinforced concrete member, a method for manufacturing a sacrificial formwork, and a fiber reinforced concrete member capable of improving the strength of the interface where the fiber reinforced concrete is joined. do.

The present invention relates to a sacrificial mold that includes reinforcing fibers and installs a sacrificial mold in which the reinforcing fibers protrude from the mold surface, and a sacrificial mold that is installed by the sacrificial mold installation step and in which the reinforcing fibers protrude. Sacrifice before the concrete placing process by removing the sacrificial form after the fiber reinforced concrete placed in the concrete placing process has hardened and the concrete placing process in which the fiber reinforced concrete is placed on the mold surface. It is a method of manufacturing a fiber reinforced concrete member including a sacrificial mold removing step of projecting reinforcing fibers included in a mold and protruding from the mold surface from the surface of hardened fiber reinforced concrete.

According to this configuration, a sacrificial formwork containing reinforcing fibers and having reinforcing fibers protruding from the formwork surface is installed by the sacrificial formwork installation process, and is installed by the sacrificial formwork installation process by the concrete placing process. Since the fiber reinforced concrete is cast on the formwork surface of the sacrificial formwork in which the reinforcing fibers protrude, the cast fiber reinforced concrete includes the reinforcing fibers protruding from the formwork surface. In addition, by removing the sacrificial mold after the fiber reinforced concrete placed in the concrete placing process has hardened by the sacrificial mold removing step, the sacrificial mold is included in the sacrificial mold before the concrete placing process. Since the reinforcing fibers protruding from the surface are projected from the surface of the hardened fiber reinforced concrete, when the fiber reinforced concrete is spliced on the surface of the fiber reinforced concrete, the reinforcing fibers are present on the interface of the splicing. Bridge. Therefore, it is possible to improve the strength of the boundary surface where the fiber reinforced concrete is joined.

In this case, in the sacrificial formwork installation process, a sacrificial formwork containing reinforcing fibers is installed in a material having a strength lower than that of the fiber-reinforced concrete after being cast and hardened in the concrete placing step, and in the sacrificial formwork removing step. It is preferable to remove the sacrificial formwork by crushing the material of the sacrificial formwork.

According to this configuration, in the sacrificial formwork installation process, the sacrificial formwork containing the reinforcing fibers is installed in a material having a lower strength than the fiber reinforced concrete after being cast and hardened in the concrete placing process. The frame is easier to manufacture. Further, in the sacrificial formwork removing step, the sacrificial formwork is removed by crushing the material of the sacrificial formwork, so that the sacrificial formwork can be removed more easily.

On the other hand, the present invention is a method for manufacturing a sacrificial formwork containing reinforcing fibers and the reinforcing fibers project from the formwork surface, and the formwork facing arrangement step of arranging a pair of formwork facing each other with a space separated from each other. , A reinforcing fiber arranging step of arranging reinforcing fibers so as to pass through the space of a pair of formwork arranged opposite to each other and penetrating both of the pair of formwork in the formwork facing arrangement step, and a reinforcing fiber arranging step. A material filling step in which the material is filled in the space of the pair of formwork in which the reinforcing fibers are arranged, and a mold of the cured material by removing the pair of formwork after the material filled in the material filling step is cured. It is a method of manufacturing a sacrificial formwork including a formwork removing step of projecting reinforcing fibers from a formwork surface in contact with the formwork.

According to this configuration, in the method of manufacturing a sacrificial formwork containing reinforcing fibers and the reinforcing fibers project from the formwork surface, a pair of formwork is arranged to face each other with a space separated from each other by the formwork facing arrangement step. In the reinforcing fiber arranging step, the reinforcing fibers are arranged so as to pass through the space of the pair of formwork arranged opposite to each other in the formwork facing arrangement step and to penetrate both of the pair of formwork, so that it is easy. The reinforcing fibers can be arranged so that the reinforcing fibers protrude from the formwork surface. Further, in the material filling step, the material is filled in the space of the pair of formwork in which the reinforcing fibers are arranged in the reinforcing fiber arranging step, and in the formwork removing step, the pair of materials filled in the material filling step is cured. By removing the formwork, the reinforcing fibers are projected from the formwork surface that was in contact with the formwork of the cured material, so that the sacrificial formwork containing the reinforcing fibers and the reinforcing fibers protruding from the formwork surface can be easily made. Can be manufactured in.

In this case, in the formwork facing arrangement step, by arranging a plurality of pairs of formwork arranged facing each other across the space at intervals from each other, the intervals, the formwork and the space are sequentially arranged in a row to reinforce the formwork. In the fiber arranging step, reinforcing fibers are arranged so as to pass through the respective intervals and spaces of the plurality of pairs of formwork arranged at intervals from each other and penetrate each of the plurality of pairs of formwork, and in the material filling step, the reinforcing fibers are arranged. In the placement process, the material is filled in each space of the multiple pairs of formwork in which the reinforcing fibers are arranged, and after the material filling process, the reinforcing fibers passing through each of the intervals of the plurality of formwork arranged at intervals from each other are cut. A reinforcing fiber cutting step may be further provided.

According to this configuration, in the formwork facing arrangement step, by arranging a plurality of pairs of formwork arranged facing each other with a space apart from each other, the intervals, the formwork and the space are sequentially formed in a row. In the reinforcing fiber arranging step, the reinforcing fibers are arranged so as to pass through the respective intervals and spaces of the plurality of pairs of formwork arranged at intervals from each other and to penetrate each of the plurality of pairs of formwork. Reinforcing fibers can be efficiently placed on the frame at the same time. Further, in the material filling step, the material is filled in each space of the plurality of pairs of formwork in which the reinforcing fibers are arranged in the reinforcing fiber arranging step, and in the reinforcing fiber cutting step, a plurality of pieces are spaced apart from each other after the material filling step. Since the reinforcing fibers passing through each of the arranged formwork intervals are cut and separated into individual sacrificial formwork, a plurality of sacrificial formwork can be efficiently manufactured at the same time.

Further, the present invention is a fiber reinforced concrete member which is a precast member made of ultra-high strength fiber reinforced concrete in which reinforcing fibers protrude from the surface thereof.

According to this configuration, in the fiber reinforced concrete member, since the reinforcing fibers protrude from the surface of the precast member made of ultra-high strength fiber reinforced concrete, when the ultra-high strength fiber reinforced concrete is spliced on the surface. In addition, reinforcing fibers are bridged to the interface of the joint. Therefore, it is possible to improve the strength of the boundary surface where the jointing is performed.

According to the method for manufacturing a fiber reinforced concrete member, the method for manufacturing a sacrificial formwork, and the fiber reinforced concrete member of the present invention, it is possible to improve the strength of the boundary portion where the fiber reinforced concrete is joined.

It is a perspective view which shows the sacrificial form in the manufacturing method of the fiber reinforced concrete member of 1st Embodiment. It is a top view which shows the formwork installation process for a precast member in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the sacrificial formwork installation process in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the concrete placing process in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the sacrificial formwork removal process in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the fiber reinforced concrete member installation process in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the interstitial concrete placing process in the manufacturing method of the fiber reinforced concrete member which concerns on 1st Embodiment. It is a top view which shows the sacrificial formwork installation process in the manufacturing method of the fiber reinforced concrete member which concerns on 2nd Embodiment. It is a top view which shows the concrete placing process in the manufacturing method of the fiber reinforced concrete member which concerns on 2nd Embodiment. It is a top view which shows the sacrificial formwork removal process in the manufacturing method of the fiber reinforced concrete member which concerns on 2nd Embodiment. FIG. 5 is a plan view showing a state in which the sacrificial formwork installation step is performed again after the sacrificial formwork removal step of FIG. It is a perspective view which shows the material containing the reinforcing fiber in the manufacturing method of the sacrificial form which concerns on 3rd Embodiment. FIG. 5 is a perspective view showing a state in which the material of FIG. 12 is separated into individual sacrificial formwork members on a cut surface. (A) is a vertical cross-sectional view showing a method of filling a material containing reinforcing fibers in the method of manufacturing a sacrificial form according to the fourth embodiment, and (B) is a mold of the sacrificial form of the material filled in (A). It is a vertical cross-sectional view which shows the state which the reinforcing fiber protruded from a frame surface. It is a figure which shows the filling method of the material containing the reinforcing fiber in the manufacturing method of the sacrificial form which concerns on 5th Embodiment. It is a figure which shows the filling method of the material containing the reinforcing fiber in the manufacturing method of the sacrificial form which concerns on 6th Embodiment. It is a figure which shows the filling method of the material containing the reinforcing fiber in the manufacturing method of the sacrificial form which concerns on 7th Embodiment. It is a vertical cross-sectional view which shows the filling method of the material containing the reinforcing fiber in the manufacturing method of the sacrificial form which concerns on 8th Embodiment. It is a perspective view which shows the formwork facing arrangement process in the manufacturing method of the sacrificial formwork which concerns on 9th Embodiment. It is a perspective view which shows the reinforcing fiber arrangement process in the manufacturing method of the sacrificial form which concerns on 9th Embodiment. It is a perspective view which shows the material filling process in the manufacturing method of the sacrificial form which concerns on 9th Embodiment. It is a perspective view which shows the reinforcing fiber cutting process in the manufacturing method of the sacrificial form which concerns on 9th Embodiment. It is a perspective view which shows the formwork removal process in the manufacturing method of the sacrificial formwork which concerns on 9th Embodiment.

Hereinafter, a method for manufacturing a fiber reinforced concrete member, a method for manufacturing a sacrificial formwork, and an ultra-high strength fiber reinforced concrete member according to the present invention will be described in detail with reference to the drawings. For the sacrificial formwork 1 in the method for manufacturing a fiber reinforced concrete member according to the first embodiment of the present invention, for example, the material and manufacturing method are specified in "Design / Construction Guideline (Draft) for Ultra High Strength Fiber Reinforced Concrete" published by the Society of Civil Engineers. It is a formwork for manufacturing a fiber reinforced concrete member made of ultra-high strength fiber reinforced concrete. As shown in FIG. 1, the sacrificial formwork 1 includes the reinforcing fibers 4, and the reinforcing fibers 4 protrude from the formwork surface 3. The reinforcing fiber 4 may be made of the same material as the reinforcing fiber of the fiber reinforced concrete member to be manufactured, or may be made of a different material.

The sacrificial formwork 1 contains reinforcing fibers 4 in a material 2 having a strength lower than that of fiber reinforced concrete such as ultra-high strength fiber reinforced concrete after being cast and hardened. The material 2, for example, can be easily斫Ru, compressive strength 10 N / mm ² or less, for example, can be applied low-strength concrete or very low strength mortar compressive strength 0.2~5N / mm ² .. Further, in addition to the above-mentioned low-strength concrete and ultra-low-strength mortar, materials 2 having a strength lower than that of fiber-reinforced concrete such as ultra-high-strength fiber-reinforced concrete after being cast and hardened include, for example, minerals such as clay. Fluidized with reinforcing fibers 4 such as system materials, plaster, urethane foam, styrol foam, low-strength resin, polymer material, gelatin, agar, etc., placed in a mold, molded, and then cured to achieve the specified strength. Any thing can be applied as long as it is in a state of being held. The length from the formwork surface 3 of the material 2 to the surface opposite to the formwork surface 3 is at least the length of the reinforcing fibers 4 in order to hold the reinforcing fibers 4 protruding from the formwork surface 3.

The amount of the reinforcing fiber 4 contained in the material 2 can be, for example, about 2 to 4 vol%, and can be 3 vol%. The amount of steel fibers contained in the ultra-high strength fiber reinforced concrete is, for example, 1.75 vol%, but the amount of the reinforcing fibers 4 of the sacrificial mold 1 is ultra-high strength so that sufficient fibers remain at the interface of the joint. It may be larger than the amount of reinforcing fibers of the fiber reinforced concrete.

Hereinafter, a method for manufacturing a fiber reinforced concrete member according to the first embodiment using the sacrificial formwork 1 will be described. As shown in FIG. 2, a precast member formwork installation step of installing the precast member formwork 11 is performed. As shown in FIG. 3, a sacrificial formwork installation step of installing the sacrificial formwork 1 including the reinforcing fibers 4 and the reinforcing fibers 4 protruding from the formwork surface 3 is performed. In the sacrificial formwork installation process, the sacrificial formwork 1 containing the reinforcing fibers 4 in the material 2 having a strength lower than that of the fiber reinforced concrete such as ultra-high strength fiber reinforced concrete after being cast and hardened in the concrete placing step described later. Is installed. In the example of FIG. 3, a pair of sacrificial formwork 1s are arranged so that their formwork surfaces 3 face each other.

As shown in FIG. 4, concrete in which fiber reinforced concrete such as ultra-high strength fiber reinforced concrete 12 is placed on the formwork surface 3 of the sacrificial formwork 1 which is installed by the sacrificial formwork installation process and in which the reinforcing fibers 4 protrude. The casting process is carried out. As shown in FIG. 5, sacrificed before the concrete placing process by removing the sacrificial mold 1 after the fiber reinforced concrete such as the ultra-high strength fiber reinforced concrete 12 placed in the concrete placing process has hardened. A sacrificial mold removing step is performed in which the reinforcing fibers 4 included in the mold 1 and protruding from the mold surface 3 are projected from the surface 13 of the fiber reinforced concrete such as the hardened ultra-high strength fiber reinforced concrete 12. In the sacrificial formwork removing step, the sacrificial formwork 1 is removed by crushing the material 2 of the sacrificial formwork 1.

As described above, the fiber reinforced concrete member 10 that can be applied to a precast floor slab or the like is manufactured. The fiber reinforced concrete member 10 of the present embodiment is a precast member made of ultra-high-strength fiber reinforced concrete 12 in which the reinforcing fibers 4 protrude from the surface 13. The surface 13 on which the reinforcing fibers 4 protrude is the surfaces of the fiber reinforced concrete members 10 on opposite sides to each other. In the fiber reinforced concrete member 10, the reinforcing fibers 4 may protrude from only one surface 13, and in that case, only one sacrificial formwork 1 is arranged. The above steps can be performed at a factory or the like other than the construction site where the floor slab installation surface exists.

Hereinafter, a method for manufacturing the fiber reinforced concrete member 10 (floor slab installation method), which is a precast floor slab, will be described at the construction site. As shown in FIG. 6, in the fiber reinforced concrete member installation step, a plurality of fiber reinforced concrete members 10 are spaced apart from each other so that the surfaces 13 on which the reinforcing fibers 4 protrude are opposed to each other. It is installed in. A formwork plate (not shown) or the like is arranged on a side surface not partitioned by the surface 13 of a rectangular parallelepiped space at intervals of a pair of fiber reinforced concrete members 10.

As shown in FIG. 7, in the interstitial concrete placing process, fiber reinforced concrete such as ultra-high-strength fiber reinforced concrete 12 is placed at intervals of fiber reinforced concrete members 10 installed on the deck installation surface 100 at intervals from each other. The padding concrete placing process is carried out. As described above, the fiber reinforced concrete members 10 which are a plurality of precast floor slabs can be connected to each other and installed on the floor slab installation surface 100.

According to the present embodiment, the sacrificial mold 1 including the reinforcing fiber 4 is installed by the sacrificial mold installation process, and the reinforcing fiber 4 protrudes from the mold surface 3, and the sacrificial mold is installed by the concrete placing process. Since fiber reinforced concrete such as ultra-high strength fiber reinforced concrete 12 is cast on the mold surface 3 of the sacrificial mold 1 which is installed by the process and the reinforcing fibers 4 protrude, the cast fiber reinforced concrete is molded. Reinforcing fibers 4 protruding from the frame surface 3 are included. Further, by removing the sacrificial mold 1 after the fiber reinforced concrete cast in the concrete placing step is hardened by the sacrificial mold removing step, the sacrificial mold 1 is included in the sacrificial mold 1 before the concrete placing step. Since the reinforcing fibers 4 protruding from the mold surface 3 are projected from the surface 13 of the hardened fiber reinforced concrete, when the fiber reinforced concrete is spliced on the surface 13 of the fiber reinforced concrete, the boundary of the splicing is performed. Reinforcing fibers 4 are bridged to the surface. Therefore, it is possible to improve the strength of the boundary surface where the fiber reinforced concrete is joined.

That is, for example, in the method of placing the fiber reinforced concrete and then washing the surface of the fiber reinforced concrete with a water jet or the like to expose the reinforcing fibers from the surface of the fiber reinforced concrete, the fibers on the surface of the fiber reinforced concrete are washed out. Has the drawback of being difficult to manage because it must be done before the fiber reinforced concrete is completely hardened (at the timing of condensation). Further, in this method, when the reinforcing fiber is a steel fiber, the steel fiber is washed out and then the main curing (steam curing) is performed, so that the steel fiber may be rusted. Further, in this method, after the steel fibers are washed out, the main body of the floor slab of the fiber reinforced concrete is transported to the site and integrated with the interstitial concrete, but there is a risk that the steel fibers will rust during this period. The reinforcing fibers may be stainless steel reinforcing fibers that do not rust or synthetic resin reinforcing fibers, but this causes high cost. On the other hand, the present embodiment has an advantage that the above problem does not occur.

Further, according to the present embodiment, in the sacrificial formwork installation step, the material 2 is reinforced with a material 2 having a strength lower than that of the fiber reinforced concrete such as the ultra-high strength fiber reinforced concrete 12 after being cast and hardened in the concrete placing step. Since the sacrificial formwork 1 containing the fiber 4 is installed, the sacrificial formwork 1 can be manufactured more easily. Further, in the sacrificial formwork removing step, the sacrificial formwork 1 is removed by crushing the material 2 of the sacrificial formwork 1, so that the sacrificial formwork 1 can be removed more easily.

Further, in the present embodiment, in the fiber reinforced concrete member 10, since the reinforcing fiber 4 protrudes from the surface 13 of the precast member made of the ultra-high strength fiber reinforced concrete 12, the ultra-high strength fiber reinforced concrete 12 is formed on the surface 13. When the joint is performed, the reinforcing fibers 4 are bridged to the boundary surface of the joint. Therefore, it is possible to improve the strength of the boundary surface where the jointing is performed.

Hereinafter, a method for manufacturing the fiber reinforced concrete member 10 (floor slab placing method), which is a floor slab at the construction site according to the second embodiment of the present invention, will be described. As shown below, the fiber reinforced concrete member 10 which is the floor slab of the present embodiment can also be manufactured by cast-in-place at the construction site. As shown in FIG. 8, the sacrificial formwork 1 is placed on the floor slab so that the formwork surface 3 faces the surface 13 of the fiber reinforced concrete member 10 installed on the floor slab installation surface 100 at the construction site at intervals. A sacrificial formwork installation step of installing on the installation surface 100 is performed. The fiber reinforced concrete member 10 may be a precast member as in the first embodiment, or may be a fiber reinforced concrete member 10 cast by cast-in-place as described later. A formwork plate (not shown) or the like is arranged on a side surface of the rectangular parallelepiped space at a distance between the fiber reinforced concrete member 10 and the sacrificial formwork 1 which is not partitioned by the formwork surface 3.

As shown in FIG. 9, a concrete placing step of placing fiber reinforced concrete such as ultra-high strength fiber reinforced concrete 12 at a distance between the surface 13 of the fiber reinforced concrete member 10 and the formwork surface 3 of the sacrificial formwork 1 is performed. Will be done. As shown in FIG. 10, by removing the sacrificial formwork 1 by crushing the material 2 of the sacrificial formwork 1, the sacrificial formwork 1 is included in the sacrificial formwork 1 and protrudes from the formwork surface 3 before the concrete placing process. A sacrificial formwork removing step is performed in which the reinforcing fibers 4 that have been used are projected from the surface 13 of the fiber reinforced concrete such as the hardened ultra-high strength fiber reinforced concrete 12.

As shown in FIG. 11, with respect to the fiber reinforced concrete member 10 in which the sacrificial formwork 1 was removed in the sacrificial formwork removing step and the reinforcing fibers 4 protruded from the surface 13, the formwork was formed on the surface 13 in the same manner as in FIG. The sacrificial formwork installation step of installing the sacrificial formwork 1 on the floor slab installation surface 100 is performed so that the surfaces 3 face each other at intervals. After that, by repeating the concrete placing step, the sacrificial formwork removing step, and the sacrificial formwork setting step in the same manner, it is possible to improve the strength of the boundary surface where the fiber reinforced concrete is to be joined in the cast-in-place.

Hereinafter, a method for manufacturing a sacrificial form according to a third embodiment of the present invention will be described. As shown in FIG. 12, a material 2 containing reinforcing fibers 4 and having a strength lower than that of the fiber reinforced concrete to be cast is filled in a formwork or the like and then cured. As described above, for example, low-strength concrete or ultra-low-strength mortar having a compressive strength of 10 N / mm ² or less, particularly a compressive strength of 0.2 to 5 ^{N / mm 2, can be applied to the material 2.} Further, the material 2 is fluidized in a state containing reinforcing fibers 4 such as mineral materials such as clay, plaster, urethane foam, styrofoam, low-strength resin, polymer materials, gelatin, agar, etc., and forms a mold. Any material can be applied as long as it is put into a container and molded and then cured to have a predetermined strength.

A cut surface 5 is set on the cured material 2. As shown in FIG. 13, the material 2 of FIG. 12 is separated into individual sacrificial formwork members at the cut surface 5. By washing out the surface of each sacrificial formwork member of FIG. 13 with a water jet or the like, the sacrificial formwork 1 containing the reinforcing fibers 4 as shown in FIG. 1 and having the reinforcing fibers 4 protruding from the formwork surface 3 is formed. Manufactured. Washing with a water jet or the like can be performed very easily because the strength of the material 2 is extremely low as compared with the ultra-high strength fiber reinforced concrete or the like. In this embodiment, the sacrificial formwork 1 can be manufactured by a simple method.

Hereinafter, a method for manufacturing a sacrificial form according to a fourth embodiment of the present invention will be described. In the production of the sacrificial formwork 1, it is preferable that the reinforcing fibers 4 project at an angle as close to perpendicular as possible to the formwork surface 3. However, when filling the mold with the material 2 containing the reinforcing fibers 4, for example, when the material 2 is filled in the mold having a wide bottom surface and a shallow depth compared to the width of the bottom surface (horizontal striking). The material 2 flows along the wide bottom surface of the formwork, and most of the reinforcing fibers 4 are oriented in the horizontal direction along the bottom surface of the formwork. Therefore, when manufacturing the sacrificial formwork 1 having a wide formwork surface 3 parallel to the bottom surface of the wide formwork, it is difficult to project the reinforcing fibers 4 at an angle close to perpendicular to the formwork surface 3.

Therefore, in the present embodiment, as shown in FIG. 14A, the filling direction D perpendicular to the mold 6 in which the bottom surface of the mold 6 is narrow and the depth is deeper than the width of the bottom surface is adopted. The material 2 containing the reinforcing fiber 4 is filled (vertical striking). The material 2 flows along the narrow bottom surface of the formwork 6, and most of the reinforcing fibers 4 are oriented horizontally along the bottom surface of the formwork 6. As shown in FIG. 14 (B), after the material 2 has hardened in the mold 6, and before the material 2 is removed from the mold 6, in the direction along the inner surface of the mold 6. By injecting the water jet W, the sacrificial formwork 1 in which the reinforcing fibers 4 project at an angle close to perpendicular to the wide formwork surface 3 parallel to the inner surface of the wide formwork 6 is manufactured.

Hereinafter, a method for manufacturing a sacrificial form according to a fifth embodiment of the present invention will be described. As shown in FIG. 15, in the present embodiment, when the material 2 containing the reinforcing fibers 4 is filled in the mold, for example, the bottom surface of the mold 7 is wide and the depth is shallow compared to the width of the bottom surface. The frame 7 is filled with the material 2. The bottom surface of the mold 7 is inclined from the horizontal at an angle θ. The angle θ is, for example, 1 ° to 2 °. In the present embodiment, the material 2 containing the reinforcing fibers 4 is filled from the upper end of the inclined formwork 7. The material 2 flows from the upper end of the inclined formwork 7 to the lower end along the bottom surface, and most of the reinforcing fibers 4 are oriented horizontally along the bottom surface of the formwork 7. After the material 2 is cured and the mold 7 is demolded, it is separated into individual sacrificial mold members as in the third embodiment, and the surface of each sacrificial mold member is surfaced by a water jet or the like. By washing out, a sacrificial formwork 1 in which the reinforcing fibers 4 project at an angle close to perpendicular to the formwork surface 3 is manufactured.

Hereinafter, a method for manufacturing a sacrificial form according to a sixth embodiment of the present invention will be described. As shown in FIG. 16, in the present embodiment, when the material 2 containing the reinforcing fibers 4 is filled in the mold, for example, the bottom surface of the mold 7 is wide and the depth is shallow compared to the width of the bottom surface. The frame 7 is filled with the material 2. In the present embodiment, after the formwork 7 is filled with the material 2 containing the reinforcing fibers 4, the rod-shaped vibrator 31 used for compacting the concrete is inserted into the uncured material 2, as shown by the arrows in FIG. In addition, the rod-shaped vibrator 31 is reciprocated in the horizontal direction. As a result, most of the reinforcing fibers 4 are oriented in the horizontal direction along the direction of the reciprocating motion of the rod-shaped vibrator 31. After the material 2 is cured and the mold 7 is demolded, it is separated into individual sacrificial mold members as in the third embodiment, and the surface of each sacrificial mold member is surfaced by a water jet or the like. By washing out, a sacrificial formwork 1 in which the reinforcing fibers 4 project at an angle close to perpendicular to the formwork surface 3 is manufactured.

Hereinafter, a method for manufacturing a sacrificial form according to the seventh embodiment of the present invention will be described. As shown in FIG. 17, in the present embodiment, when the material 2 containing the reinforcing fibers 4 is filled in the mold, for example, the bottom surface of the mold 7 is wide and the depth is shallow compared to the width of the bottom surface. The frame 7 is filled with the material 2. In the present embodiment, after the formwork 7 is filled with the material 2 containing the reinforcing fibers 4, the comb-shaped teeth of the comb-shaped instrument 32 in which a plurality of comb-shaped teeth protrude downward like a comb for hair conditioning are uncured. Is inserted into the material 2 of the above, and the comb-shaped instrument 32 is moved in the horizontal direction as shown by the arrow in FIG. As a result, most of the reinforcing fibers 4 are oriented in the horizontal direction along the moving direction of the comb-shaped instrument 32. After the material 2 is cured and the mold 7 is demolded, it is separated into individual sacrificial mold members as in the third embodiment, and the surface of each sacrificial mold member is surfaced by a water jet or the like. By washing out, a sacrificial formwork 1 in which the reinforcing fibers 4 project at an angle close to perpendicular to the formwork surface 3 is manufactured.

Hereinafter, a method for manufacturing a sacrificial form according to an eighth embodiment of the present invention will be described. As shown in FIG. 18, in the present embodiment, when the material 2 containing the reinforcing fibers 4 is filled in the mold, for example, the bottom surface of the mold 7 is wide and the depth is shallow compared to the width of the bottom surface. The frame 7 is filled with the material 2. The material 2 is a low-strength concrete or an extremely low-strength mortar containing the reinforcing fibers 4 and having a hardness that does not cause fluidity and does not cause a shape change due to gravity before being cured (hard kneading).

The reinforcing fibers 4 are kneaded into the material 2 so that the reinforcing fibers 4 are oriented at an angle close to vertical. Since it is desired to orient the reinforcing fibers 4 at an angle close to perpendicular to the formwork surface 3 parallel to the wide bottom surface of the formwork 7, there is no problem even if a hitting weight 8 is generated on the material 2 to be filled. After the material 2 is cured, the surface parallel to the bottom surface of the mold 7 of the material 2 is washed out by a water jet or the like, so that the surface parallel to the bottom surface of the wide mold 7 is almost perpendicular to the wide mold surface 3. A sacrificial formwork 1 in which the reinforcing fibers 4 project at an angle is manufactured.

Hereinafter, a method for manufacturing the sacrificial formwork according to the ninth embodiment will be described. As shown in FIG. 19, a formwork facing arrangement step of arranging a pair of formwork 21s facing each other with a space 22 separated from each other is performed. The formwork 21 is a mesh formwork or a comb-shaped formwork through which reinforcing fibers 4 such as steel fiber strands (wires) can penetrate. In the formwork facing arrangement step, by arranging a plurality of pairs of formwork 21s arranged facing each other with a space 22 separated from each other with a space 23 separated from each other, the space 23, the formwork 21 and the space 22 are sequentially arranged in a row. To be done. In addition, in order to partition the space 22, a bottom frame (not shown) is arranged on the bottom surface of the space 22, and a side frame (not shown) is arranged on the side surface of the space 22 where the formwork 21 is not arranged.

In the present embodiment, when the sacrificial formwork 1 is manufactured one by one, only a pair of formwork 21 is arranged in the formwork facing arrangement step, and the following steps are performed on the pair of formwork 21.

As shown in FIG. 20, in the formwork facing arrangement step, the reinforcing fibers 4 are arranged so as to pass through the space 22 of the pair of formwork 21 arranged so as to face each other with the space 22 separated from each other and to penetrate both of the pair of formwork 21. Reinforcing fiber placement process is performed. In the reinforcing fiber arranging step, the reinforcing fibers 4 are arranged so as to pass through the respective intervals 23 and the spaces 22 of the formwork 21 arranged in pairs at intervals 23 and to penetrate each of the plurality of pairs of formwork 21. ..

As shown in FIG. 21, in the reinforcing fiber arranging step, a material filling step of filling the space 22 of the pair of formwork 21 in which the reinforcing fibers 4 are arranged is performed. In the material filling step, the material 2 is filled in each space 22 of the plurality of pairs of formwork 21 in which the reinforcing fibers 4 are arranged in the reinforcing fiber arranging step.

As shown in FIG. 22, after the material filling step, a reinforcing fiber cutting step of cutting the reinforcing fibers 4 passing through each of the gaps 23 of the plurality of formwork 21 arranged at intervals from each other is performed. When the sacrificial formwork 1 is manufactured one by one, the reinforcing fiber cutting step is not required. Further, the reinforcing fiber cutting step can be performed both before and after the material 2 is cured. If possible, the reinforcing fiber cutting step may be performed after the formwork removing step described later.

As shown in FIG. 23, by removing the pair of formwork 21 after the material 2 filled in the material filling step is cured, the reinforcing fibers are removed from the formwork surface 3 in contact with the formwork 21 of the cured material 2. A mold removing step of projecting 4 is performed. Since the material 2 which is low-strength concrete or ultra-low-strength mortar has low strength, the formwork 21 can be easily removed.

According to the present embodiment, in the method of manufacturing a sacrificial formwork 1 including the reinforcing fibers 4 and the reinforcing fibers 4 project from the formwork surface 3, a pair of molds are separated from each other by a formwork facing arrangement step. The frames 21 are arranged to face each other, and in the reinforcing fiber arranging step, the frames 21 pass through the space 22 of the pair of formwork 21 arranged to face each other with the space 22 separated from each other in the formwork facing arrangement step, and penetrate both of the pair of formwork 21. Since the reinforcing fibers 4 are arranged in the formwork, the reinforcing fibers 4 can be easily arranged so that the reinforcing fibers 4 protrude from the formwork surface 3. Further, in the material filling step, the material 2 is filled in the space 22 of the pair of formwork 21 in which the reinforcing fibers 4 are arranged in the reinforcing fiber arranging step, and in the formwork removing step, the material 2 filled in the material filling step is filled. By removing the pair of formwork 21 after curing, the reinforcing fibers 4 are projected from the formwork surface 3 which was in contact with the formwork 21 of the cured material 2, so that the reinforcing fibers 4 are included and the formwork surface thereof is included. The sacrificial formwork 1 in which the reinforcing fiber 4 protrudes from 3 can be easily manufactured. It is also easy to project the reinforcing fibers 4 at an angle close to perpendicular to the formwork surface 3.

Further, according to the present embodiment, in the formwork facing arrangement step, a plurality of pairs of formwork 21s arranged facing each other with a space 22 are arranged so as to be spaced apart from each other with a space 23, so that the space 23 and the formwork 21 are arranged. And the space 22 are sequentially arranged in a row, and in the reinforcing fiber arranging step, each of the plurality of pairs of formwork 21 is passed through the space 22 and the space 23 of the formwork 21 arranged in a plurality of pairs at intervals 23 from each other. Since the reinforcing fibers 4 are arranged so as to penetrate through them, the reinforcing fibers 4 can be efficiently arranged at the same time with respect to the plurality of formwork 21s. Further, in the material filling step, the material 2 is filled in each space 22 of the plurality of pairs of formwork 21 in which the reinforcing fibers 4 are arranged in the reinforcing fiber arranging step, and in the reinforcing fiber cutting step, the materials 2 are spaced apart from each other after the material filling step. In order to cut the reinforcing fibers 4 passing through each of the intervals 23 of the plurality of formwork 21 arranged with 23 apart and separate them into individual sacrificial formwork 1, a plurality of sacrificial formwork 1 can be efficiently manufactured at the same time. Can be done.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms.

1 ... sacrificial formwork, 2 ... material, 3 ... formwork surface, 4 ... reinforcing fiber, 5 ... cut surface, 6 ... formwork, 7 ... formwork, 8 ... weight, 10 ... fiber reinforced concrete member, 11 ... Formwork for precast members, 12 ... Ultra-high strength fiber reinforced concrete, 13 ... Surface, 21 ... Formwork, 22 ... Space, 23 ... Spacing, 100 ... Floor slab installation surface, D ... Filling direction, W ... Water jet, θ ... angle, 31 ... rod-shaped vibrator, 32 ... comb-shaped instrument.

Claims (2)

Comprises reinforcing fibers, the reinforcing fibers from the mold surface is a method for producing a mold which projects,
A formwork facing arrangement process in which a pair of formwork manufacturing forms are arranged facing each other with a space separated from each other.
Reinforcement in which the reinforcing fibers are arranged so as to pass through the space of the pair of formwork manufacturing molds arranged so as to face each other so as to penetrate both of the pair of formwork in the formwork facing arrangement step. Fiber placement process and
In the reinforcing fiber arranging step, a material filling step of filling the space of the pair of formwork manufacturing molds in which the reinforcing fibers are arranged is provided.
By removing the pair of the formwork manufacturing formwork after the material filled in the material filling step is cured, from the formwork surface of the cured material that was in contact with the formwork manufacturing formwork. The formwork removing step of projecting the reinforcing fibers and
A method of manufacturing a formwork equipped with. In the formwork facing arrangement step, by arranging a plurality of pairs of the formwork manufacturing formwork arranged so as to face each other with the space spaced apart from each other, the spacing, the formwork manufacturing formwork, and the formwork manufacturing formwork are arranged. Make sure that the spaces are in a row in sequence.
In the reinforcing fiber arranging step, a plurality of pairs of the formwork manufacturing molds arranged at the same distance from each other pass through the respective intervals and the space and penetrate each of the plurality of pairs of the formwork manufacturing molds. The reinforcing fibers are arranged so as to
In the material filling step, the material is filled in each of the spaces of the plurality of pairs of the formwork for manufacturing the formwork in which the reinforcing fibers are arranged in the reinforcing fiber arranging step.
The first aspect of claim 1, further comprising a reinforcing fiber cutting step of cutting the reinforcing fibers passing through each of the intervals of the formwork manufacturing formwork, which are arranged at intervals after the material filling step. Formwork manufacturing method.

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