JP7483228B2 - Formwork for pouring concrete materials - Google Patents

Description

The present invention relates to a formwork for pouring concrete material, which is used when pouring concrete material.

When constructing a concrete structure, a formwork is used to define an area for pouring concrete material, and concrete material is poured into the area. After the concrete material has hardened, the formwork is dismantled and separated from the concrete structure.

Since the formwork bears the pressure of the poured concrete material, it must be strong. Patent Document 1 discloses a formwork in which the panel members are reinforced from the rear side with a reinforcing material.

JP 2018-3354 A

In the formwork disclosed in Patent Document 1, there is a risk that the panel members may be deformed or damaged, resulting in a deterioration in the quality of the concrete structure, such as its shape, or that the poured concrete material may not be able to harden while maintaining its temperature, resulting in a deterioration in the quality of the concrete structure, such as its strength.

The present invention aims to provide a formwork for pouring concrete materials that can improve the quality of concrete structures.

The present invention provides a formwork for pouring concrete material used to define a concrete material pouring area, the formwork unit comprising a panel member having a front surface facing the concrete material pouring area, a back surface opposite the front surface, and a side surface connecting the front surface and the back surface, and a retaining member for holding the panel member, the retaining member being provided opposite the back surface of the panel member and having a support portion for supporting the panel member, and a rim portion protruding from the support portion along the side surface of the panel member and surrounding the side surface, the support portion having a base portion extending along the back surface of the panel member, and a plurality of hollow protrusions protruding from the base to the side opposite the panel member, the tops of the protrusions being provided with first through holes formed in a direction intersecting the back surface of the panel member, and the formwork units being arranged side by side.
The present invention also relates to a formwork for pouring concrete material used to define a concrete material pouring area, the formwork unit comprising: a panel member having a front surface facing the concrete material pouring area, a back surface opposite the front surface, and a side surface connecting the front surface and the back surface; and a retaining member for holding the panel member, the retaining member being provided opposite the back surface of the panel member and having a support portion for supporting the panel member, and a rim portion protruding from the support portion along the side surface of the panel member and surrounding the side surface, the support portion having a base portion extending along the back surface of the panel member and a plurality of hollow protrusions protruding from the base to the side opposite the panel member, the support portion further having a second through hole formed in a side wall of the protrusions in a direction along the back surface of the panel member, and a side wall rib provided between the periphery of the second through hole and the top of the protrusions to reinforce the side wall, and the formwork units are arranged side by side .
The present invention also relates to a formwork for pouring concrete material used to define a concrete material pouring area, the formwork unit comprising a panel member having a front surface facing the concrete material pouring area, a back surface opposite the front surface, and a side surface connecting the front surface and the back surface, and a retaining member for holding the panel member, the retaining member being provided opposite the back surface of the panel member and having a support portion for supporting the panel member, and an edge portion protruding from the support portion along the side surface of the panel member and surrounding the side surface, the support portion having a base portion extending along the back surface of the panel member and a plurality of hollow protrusions protruding from the base to the side opposite the panel member, the support portion further having connecting ribs connecting adjacent protrusions to each other, and the formwork units being arranged side by side.
The present invention also relates to a formwork for pouring concrete material used to define a concrete material pouring area, the formwork unit comprising: a hollow panel member having a front surface facing the concrete material pouring area, a back surface opposite the front surface, and a side surface connecting the front surface and the back surface; and a retaining member for holding the panel member, the retaining member being provided opposite the back surface of the panel member and having a support portion for supporting the panel member, and an edge portion protruding from the support portion along the side surface of the panel member and surrounding the side surface , the support portion having a base portion extending along the back surface of the panel member and a plurality of hollow protrusions protruding from the base to the side opposite the panel member, the retaining member further having an engaging portion provided on the edge portion for detachably engaging with the panel member, the engaging portion protruding inward from the edge portion and being inserted into the side surface of the panel member, and the formwork unit being arranged in juxtaposition.

The present invention provides a formwork for pouring concrete material that can improve the quality of concrete structures.

1(a) shows a formwork for pouring concrete material according to an embodiment of the present invention, in which (a) is a front view of the formwork for pouring concrete material as viewed from the concrete material pouring area side, (b) is a plan view of the formwork for pouring concrete material as viewed in the direction of arrow IB in FIG. 1(a), and (c) is a side view of the formwork for pouring concrete material as viewed in the direction of arrow IC in FIG. 1(a). 2A is a perspective view of the form unit shown in FIG. 1 , and FIG. 2B is an exploded perspective view of the form unit. FIG. 11 is an enlarged cross-sectional view showing the form units arranged side by side and connected together. 1A is a plan view of the holding member, FIG. 1B is a front view of the holding member, FIG. 1C is a side view of the holding member, and FIG. 4(a) is a cross-sectional view taken along line VA-VA shown in FIG. 4(a), (b) is a cross-sectional view taken along line VB-VB shown in FIG. 4(a), (c) is a cross-sectional view taken along line VC-VC shown in FIG. 4(a), and (d) is a cross-sectional view taken along line VD-VD shown in FIG. 4(a). 11 is an enlarged cross-sectional view showing the state in which the holding member and the horizontal end are fastened together. FIG. FIG. 4 is an enlarged cross-sectional view showing a state in which the holding members are stacked. 11A and 11B are diagrams for explaining a mold used in manufacturing the holding member. 1A is a rear view of a holding member according to a first modified example of an embodiment of the present invention, and FIG. 1B is a rear view of a holding member according to a second modified example of an embodiment of the present invention.

Below, a concrete material pouring formwork (also simply called "formwork") 1 according to an embodiment of the present invention will be described with reference to the drawings.

Figure 1(a) is a front view of the formwork 1 as viewed from the concrete material pouring area 2 side, Figure 1(b) is a plan view of the formwork 1 as viewed in the direction of the arrow IB in Figure 1(a), and Figure 1(c) is a side view of the formwork 1 as viewed in the direction of the arrow IC in Figure 1(a).

When constructing a concrete structure at a building or construction site, as shown in FIG. 1, a formwork 1 is used to define a concrete material pouring area 2, and concrete material is poured into the concrete material pouring area 2. The formwork 1 is constructed by fixing a plurality of formwork units 100 to a horizontal end 3 to arrange the formwork units 100 side by side in the horizontal direction, and fixing the horizontal end 3 to a vertical end 4 to arrange the formwork units 100 side by side in the vertical direction. The horizontal end 3 and the vertical end 4 are, for example, H-shaped steel. After the concrete material hardens, the formwork 1 is dismantled, and the formwork units 100 are separated from the concrete structure.

Figure 1 shows an example in which formwork 1 is constructed to define a concrete material pouring area 2 on an existing concrete structure, but formwork 1 may also be constructed to define a concrete material pouring area 2 on the ground.

Figure 2(a) is a perspective view of a formwork unit 100. As shown in Figure 2(a), the formwork unit 100 includes a panel member 10 and a holding member 20 that holds the panel member 10. When the formwork units 100 are arranged side by side, the holding member 20 is fastened to the horizontal end 3 (see Figure 1). The panel member 10 is detachable from the holding member 20, and Figure 2(b) shows the panel member 10 removed from the holding member 20.

The panel member 10 has a front surface 11 facing the concrete material pouring area 2 (see FIG. 1), a back surface 12 opposite the front surface 11, and side surfaces 13 connecting the front surface 11 and the back surface 12. In this embodiment, the panel member 10 is formed in a substantially rectangular parallelepiped shape, and four side surfaces 13 are formed on the panel member 10.

In the following, the dimensions and directions along the long sides of the front surface 11 are referred to as the "length" and "length direction", respectively, and the dimensions and directions along the short sides of the front surface 11 are referred to as the "width" and "width direction", respectively.

The surface of the concrete structure is formed in a shape corresponding to the front surface 11. For example, when a panel member 10 with a flat front surface 11 is used, the surface of the concrete structure is formed flat. When a panel member 10 with an uneven front surface 11 is used, unevenness is formed on the surface of the concrete structure. In the formwork unit 100, the panel member 10 is detachable from the holding member 20, so that the shape of the surface of the concrete structure can be changed by replacing the panel member 10. Also, because the panel member 10 is detachable from the holding member 20, when the panel member 10 is damaged, the formwork unit 100 can be used by simply replacing the panel member 10.

The front surface 11 of the panel member 10 is composed of a first skin layer, and the back surface 12 is composed of a second skin layer. The core layer between the first and second skin layers has a so-called honeycomb structure in which multiple hollow hexagonal columnar cells are arranged. The first skin layer, the second skin layer, and the core layer are formed using a thermoplastic resin such as polypropylene.

In the panel member 10, the core layer between the first skin layer and the second skin layer has a honeycomb structure, so an air layer is formed inside the panel member 10. This improves the insulation properties of the panel member 10. This allows the concrete material to harden while maintaining its temperature, thereby increasing the strength of the concrete structure.

In addition, the honeycomb structure provided between the first and second skin layers can reduce the weight of the panel member 10 while increasing its bending strength. This makes it easier to construct and dismantle the formwork 1, reduces deformation of the panel member 10, and improves the quality of the shape of the concrete structure.

The core layer between the first skin layer and the second skin layer is not limited to a honeycomb structure, and may be, for example, a structure in which a plurality of cylindrical or frusto-conical cells are arranged in the intermediate structure. Also, known plastic corrugated cardboard may be used as the panel member 10. Even in these cases, the concrete material can be hardened while maintaining the temperature of the poured concrete material, and the bending strength of the panel member 10 can be increased while reducing its weight.

The retaining member 20 has a support portion 30 that supports the panel member 10, and an edge portion 40 that protrudes from the support portion 30 along the side surface 13 of the panel member 10. The retaining member 20 is formed by injection molding using a thermoplastic resin such as polypropylene, and the support portion 30 and the edge portion 40 are integrated. The retaining member 20 can also be formed by other molding methods, for example, by press molding.

The support portion 30 is provided facing the back surface 12 of the panel member 10. Therefore, the panel member 10 is pressed against the support portion 30 when the concrete material is poured. This reduces deformation of the panel member 10 caused by the pressure of the poured concrete material, thereby improving the quality of the shape of the concrete structure.

The edge portion 40 is formed in a ring shape and surrounds the side surface 13 of the panel member 10.

Figure 3 is an enlarged cross-sectional view showing the formwork units 100 arranged side by side and connected. As shown in Figure 3, when the formwork units 100 are arranged side by side, the edges 40 of adjacent formwork units 100 are adjacent to each other. This prevents the side surface 13 of one panel member 10 from coming into contact with the side surface 13 of another panel member 10 when constructing and dismantling the formwork 1, thereby reducing deformation and damage to the panel members 10. This improves the quality of the shape of the concrete structure.

As shown in FIG. 2(b), the edge portion 40 and the support portion 30 form a substantially rectangular recess. The inner length L2 of the edge portion 40 is substantially equal to the length L1 of the panel member 10, and the inner width W2 of the edge portion 40 is substantially equal to the width W1 of the panel member 10. Therefore, the panel member 10 fits inside the edge portion 40.

As shown in Figures 2 and 3, when the panel member 10 is pressed against the support portion 30 of the retaining member 20, the edge portion 40 is approximately flush with the front surface 11 of the panel member 10. Therefore, the surface of the concrete structure formed by arranging the formwork units 100 side by side and pouring the concrete material can be made flat.

The edge portion 40 is provided with a claw (engagement portion) 50 that protrudes inward. The claw 50 is inserted into the side surface 13 of the panel member 10 and engages with the panel member 10. This prevents the side surface 13 of the panel member 10 from protruding from the edge portion 40. This reduces the step formed at the boundary between the edge portion 40 and the panel member 10, making the surface of the concrete structure flatter. The side walls of the cells in the core layer of the panel member 10 are formed thinner than the first and second skin layers. This makes it easier for the claw 50 to press and engage the side walls of the cells in the core layer.

The panel member 10 is inserted into the holding member 20 by pushing it into the recess formed by the edge portion 40 and the support portion 30. The surface of the claw 50 is inclined with respect to the direction in which the panel member 10 is inserted into the holding member 20. This allows the panel member 10 to be easily inserted into the holding member 20.

When a force is applied to the panel member 10 in a direction away from the support portion 30, the claw 50 comes off the side surface 13 of the panel member 10, and the engagement between the panel member 10 and the claw 50 is released. In other words, the claw 50 removably engages with the panel member 10.

The support portion 30 is provided with a frame portion 31 that protrudes on the side opposite the edge portion 40. The frame portion 31 forms the outer casing 31a of the support portion 30.

The edge portion 40 has a bulging surface 41 that bulges out toward the opposite side of the side surface 13 of the panel member 10 with respect to the outer casing 31a of the support portion 30. When the formwork units 100 are arranged side by side, the bulging surfaces 41 of adjacent formwork units 100 come into contact with each other. Therefore, the support portions 30 of adjacent formwork units 100 face each other with a gap therebetween, and the size of the gap between the edge portions 40 of adjacent formwork units 100 is determined by the molding accuracy of the edge portions 40. Therefore, the gap between the edge portions 40 of adjacent formwork units 100 can be reduced simply by increasing the molding accuracy of the edge portions 40, and the flow of poured concrete material between adjacent formwork units 100 can be reduced.

A hole 32 that opens to the outer shell 31a is formed in the frame portion 31 of the support portion 30. When the formwork units 100 are arranged side by side, the retaining members 20 of the adjacent formwork units 100 can be fastened together by inserting a bolt 5 into the hole 32 of the adjacent formwork units 100 and screwing a nut 6 onto the bolt 5. The distance between the support portions 30 can be adjusted by sandwiching a washer 7 between the support portions 30 of the adjacent formwork units 100.

Figure 4(a) is a plan view of the holding member 20, Figure 4(b) is a front view of the holding member 20, Figure 4(c) is a side view of the holding member 20, and Figure 4(d) is a rear view of the holding member 20. Figure 5(a) is a cross-sectional view taken along line VA-VA in Figure 4(a), and Figure 5(b) is a cross-sectional view taken along line VB-VB in Figure 4(a). Figure 5(c) is a cross-sectional view taken along line VC-VC in Figure 4(a), and Figure 5(d) is a cross-sectional view taken along line VD-VD in Figure 4(a). Figure 5 shows the panel member 10 attached to the holding member 20.

4 and 5, the support portion 30 has a flat base portion 33 extending along the back surface 12 of the panel member 10, and a plurality of protrusions 34 protruding from the base portion 33 to the side opposite the panel member 10. The protrusions 34 are formed hollow so that an opening 33a is formed in the base portion 33. Specifically, as shown in Figs. 5(b) and 5(d), the protrusions 34 have a side wall 34a extending from the periphery of the opening 33a in the base portion 33 to the side opposite the panel member 10, and a top portion 34b facing the space surrounded by the side wall 34a. The opening 33a in the base portion 33 is blocked by the panel member 10.

In FIG. 4(d), the tops 34b of the protrusions 34 are hatched with a dot pattern to clarify the arrangement of the protrusions 34.

In the formwork unit 100, the convex portion 34 is formed hollow, so an air layer is formed inside the convex portion 34. This improves the thermal insulation of the retaining member 20. This allows the concrete material to harden while maintaining the temperature of the poured concrete material, further improving the quality of the concrete structure, such as its strength.

The multiple protrusions 34 are aligned in the length and width directions. Protrusions 34 adjacent in the length direction are connected to each other via a connecting rib 35a extending in the length direction. Similarly, protrusions 34 adjacent in the width direction are connected to each other via a connecting rib 35b extending in the width direction. Therefore, the space between adjacent protrusions 34 is reinforced by the connecting ribs 35a, 35b. Therefore, the panel member 10 can be firmly supported, and deformation of the panel member 10 can be reduced. This can improve the quality of the shape, etc. of the concrete structure.

The top 34b of the protrusion 34 is provided with a first through hole 36 formed to penetrate in a direction intersecting with the back surface 12 of the panel member 10. A jig (not shown) for removing the panel member 10 from the holding member 20 can be inserted into the first through hole 36. When removing the panel member 10 from the holding member 20, the jig is inserted into the first through hole 36 and the back surface 12 of the panel member 10 is pressed. This allows the panel member 10 to be easily removed. In addition, since it is not necessary to apply the jig to the front surface 11 of the panel member 10, the panel member 10 can be removed from the holding member 20 without damaging the front surface 11.

Figure 6 is an enlarged cross-sectional view showing the state in which the retaining member 20 and the horizontal end 3 are fastened. As shown in Figure 6, the side wall 34a of the protrusion 34 is provided with a second through hole 37 formed by penetrating in a direction along the back surface 12 of the panel member 10. An L-shaped hook 8 for fastening the retaining member 20 and the horizontal end 3 can be inserted into the second through hole 37. One end of the L-shaped hook 8 is inserted into the second through hole 37, and the other end is inserted into a hole (not shown) formed in the horizontal end 3. The retaining member 20 is fastened to the horizontal end 3 by screwing a nut 9 onto the other end of the L-shaped hook 8.

The second through holes 37 also function as air vent holes when the panel member 10 is inserted into the holding member 20. The second through holes 37 may be formed in all of the protrusions 34.

A sidewall rib 38 is provided on the sidewall 34a of the protrusion 34, extending between the periphery of the second through hole 37 and the top 34b of the protrusion 34. Therefore, the sidewall 34a is reinforced by the sidewall rib 38. This allows the retaining member 20 and the lateral end 3 to be firmly fastened together. The second through hole 37 is also reinforced by the sidewall rib 38.

As shown in FIG. 4, the support portion 30 constitutes the back portion 21 of the holding member 20 on the opposite side to the panel member 10. The outer dimension of the back portion 21 is formed to be smaller than the inner dimension of the edge portion 40. Specifically, the length L3 of the back portion 21 is smaller than the inner length L2 of the edge portion 40, and the width W3 of the back portion 21 is smaller than the inner width W2 of the edge portion 40.

Figure 7 is an enlarged cross-sectional view showing multiple holding members 20 stacked on top of each other. Since the outer dimensions of the backs 21 of the holding members 20 are smaller than the inner dimensions of the edge portions 40, when multiple holding members 20 are stacked without the panel members 10 attached, the backs 21 of the holding members 20 fit into the edge portions 40 as shown in Figure 7. This prevents the stacked holding members 20 from collapsing.

Figure 8 is a diagram for explaining the mold 60 used to manufacture the holding member 20. The mold 60 has an upper mold 60a and a lower mold 60b. When thermoplastic resin is injected into the space defined by the upper mold 60a and the lower mold 60b, the holding member 20 is molded. After the thermoplastic resin hardens, the lower mold 60b is moved in a direction (the direction of the downward white arrow shown in Figure 8) in which the holding member 20 is released while the upper mold 60a is fixed. The holding member 20 is then released from the lower mold 60b. This causes the holding member 20 to be removed from the mold 60.

As shown in FIG. 8(a), the side wall 34a of the protrusion 34 is formed by flowing thermoplastic resin into the space surrounded by the concave mold 61b provided in the lower mold 60b and the convex mold 61a provided in the upper mold 60a. The concave mold 61b has an opening dimension larger than the bottom dimension, and the convex mold 61a has a base dimension larger than the tip dimension. This allows the lower mold 60b to be smoothly removed from the upper mold 60a. This allows the thickness of the side wall 34a of the protrusion 34 to be uniform in the vertical direction shown in FIG. 8.

In addition, the outer dimensions of the protrusion 34 become smaller as it moves away from the base 33. Therefore, the inner dimensions of the concave mold 61b of the lower mold 60b can be made smaller as it moves toward the bottom of the concave mold 61b. Therefore, the protrusion 34 of the holding member 20 can be easily removed from the concave mold 61b of the lower mold 60b.

As shown in FIG. 8(b), the connection ribs 35a, 35b of the holding member 20 are formed by a recessed mold 62b provided in the lower mold 60b. The connection ribs 35a, 35b become thinner as they move away from the base 33. This allows the inner dimensions of the recessed mold 62b of the lower mold 60b to become smaller as they move toward the bottom of the recessed mold 62b. This allows the connection ribs 35a, 35b of the holding member 20 to be easily removed from the recessed mold 62b of the lower mold 60b.

The above embodiment provides the following effects:

The edge 40 surrounds the side surface 13 of the panel member 10. Therefore, when the formwork units 100 are arranged side by side, the edge portions 40 of adjacent formwork units 100 are adjacent to each other. This prevents the side surface 13 of one panel member 10 from coming into contact with the side surface 13 of another panel member 10 when constructing and dismantling the formwork 1, thereby reducing deformation and damage to the panel members 10. This improves the quality of the shape, etc. of the concrete structure.

In the formwork unit 100, the convex portion 34 is formed hollow. Therefore, an air layer is formed inside the convex portion 34. This improves the thermal insulation of the retaining member 20. This allows the concrete material to harden while maintaining the temperature of the poured concrete material, thereby further improving the quality of the concrete structure, such as its strength.

The claws 50 are provided on the edge 40 and engage with the panel member 10. This prevents the side surface 13 of the panel member 10 from protruding from the edge 40. This reduces the step formed at the boundary between the edge 40 and the panel member 10, making the surface of the concrete structure flatter.

The edge portion 40 has a bulging surface 41 that bulges out toward the opposite side of the side surface 13 of the panel member 10 with respect to the outer casing 31a of the support portion 30. When the formwork units 100 are arranged side by side, the bulging surfaces 41 of adjacent formwork units 100 come into contact with each other. Therefore, the support portions 30 of adjacent formwork units 100 face each other with a gap therebetween, and the size of the gap between the edge portions 40 of adjacent formwork units 100 is determined by the molding accuracy of the edge portions 40. Therefore, the gap between the edge portions 40 of adjacent formwork units 100 can be reduced simply by increasing the molding accuracy of the edge portions 40, and the flow of poured concrete material between adjacent formwork units 100 can be reduced.

The back 21 of the holding member 20 is formed so that its outer dimensions are smaller than the inner dimensions of the edge 40. Therefore, when multiple holding members 20 without panel members 10 attached are stacked, the back 21 of the holding member 20 fits into the edge 40. This prevents the stacked holding members 20 from collapsing.

A first through hole 36 is formed in the top 34b of the protrusion 34, into which a jig can be inserted to remove the panel member 10 from the holding member 20. Therefore, the jig can be inserted into the first through hole 36 to press the back surface 12 of the panel member 10. This allows the panel member 10 to be easily removed, and since there is no need to apply the jig to the front surface 11 of the panel member 10, the panel member 10 can be removed from the holding member 20 without damaging the front surface 11.

A sidewall rib 38 is provided on the sidewall 34a of the protrusion 34 between the periphery of the second through hole 37 and the top 34b of the protrusion 34. Therefore, the sidewall 34a is reinforced by the sidewall rib 38. Therefore, the retaining member 20 and the horizontal end 3 can be firmly fastened.

The inner dimensions of the convex portion 34 become smaller as it moves away from the base portion 33. Therefore, the outer dimensions of the convex mold 61a of the upper mold 60a can be made larger from the tip to the base end of the convex mold 61a, and the convex mold 61a of the upper mold 60a can be easily removed from the convex portion 34 of the holding member 20. Therefore, the holding member 20 can be easily molded.

In addition, the outer dimensions of the protrusions 34 become smaller as they move away from the base 33. Therefore, the inner dimensions of the concave mold 61b of the lower mold 60b can be made smaller as they move toward the bottom of the concave mold 61b, and the protrusions 34 of the holding member 20 can be easily removed from the concave mold 61b of the lower mold 60b. Therefore, the holding member 20 can be easily molded.

The adjacent protrusions 34 in the lengthwise direction are connected to each other via the connecting rib 35a extending in the lengthwise direction, and the adjacent protrusions 34 in the widthwise direction are connected to each other via the connecting rib 35b extending in the widthwise direction. Therefore, the space between the adjacent protrusions 34 is reinforced by the connecting ribs 35a, 35b. Therefore, the panel member 10 can be firmly supported, and deformation of the panel member 10 can be reduced.

The connection ribs 35a, 35b of the holding member 20 become thinner as they move away from the base 33. Therefore, the inner dimensions of the concave mold 62b of the lower mold 60b can be made smaller as they move toward the bottom of the concave mold 62b, and the connection ribs 35a, 35b of the holding member 20 can be easily removed from the concave mold 62b of the lower mold 60b. Therefore, the holding member 20 can be easily molded.

By making the formwork 1 out of synthetic resin, it can be made lighter than a metal formwork. Therefore, when the formwork 1 is suspended by a crane or the like for construction, the peripheral equipment of the formwork 1, such as the crane's motor, can be made smaller.

The hollow panel member 10 has a heat insulating effect over the entire surface, and the heat insulating effect is further improved by forming a protrusion 34 on the holding member 20. Therefore, the heat insulating effect of the formwork 1 as a whole can be increased.

By making the formwork 1 out of synthetic resin, it becomes possible to reuse it. Specifically, concrete material may adhere to the panel member 10 after concrete material is poured, but the retaining member 20 can be reused by replacing the panel member 10 to which the concrete material adheres. It is also possible to mold the retaining member 20 using recycled material obtained by crushing this retaining member, allowing the synthetic resin to be reused.

Although the embodiments of the present invention have been described above, the above embodiments merely show some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

In the above embodiment, as shown in FIG. 4(d), the multiple protrusions 34 on the holding member 20 are spaced apart, but the present invention is not limited to this form. For example, as shown in FIG. 9(a), adjacent protrusions 34 may be adjacent to each other in an oblique direction that is inclined with respect to the length direction and width direction.

In the above embodiment, as shown in FIG. 4(d), the protrusion 34 of the holding member 20 is disposed away from the frame portion 31, but the present invention is not limited to this form. For example, as shown in FIG. 9(b), the protrusion 34 may be adjacent to the frame portion 31.

In the above embodiment, the retaining member 20 is fastened to the horizontal end 3, but the retaining member 20 may also be fastened to the vertical end 4.

In the above embodiment, a formwork 1 in which formwork units 100 are arranged side by side has been described, but the present invention can also be applied to a formwork in which formwork units 100 are installed individually.

The formwork 1 may not have an edge portion 40. In other words, the formwork 1 may have a panel member 10 and a support portion 30, and the support portion 30 may have a base portion 33 and a plurality of protrusions 34 formed in the air. Even in this form, an air layer is formed inside the protrusions 34. This improves the insulation properties of the support portion 30. This allows the concrete material to harden while maintaining its temperature, thereby improving the quality of the concrete structure, such as its strength.

In the above embodiment, the panel member 10 is formed using a thermoplastic resin, but the panel member 10 may be formed using a material other than a thermoplastic resin, such as iron, aluminum, copper, titanium, magnesium, and alloys thereof. Similarly, the retaining member 20 may be formed using a material other than a thermoplastic resin, such as iron, aluminum, copper, titanium, magnesium, and alloys thereof.

When the panel members 10 and the retaining members 20 are made of thermoplastic resin, the formwork unit 100 can be made lighter than when they are made of iron, aluminum, copper, titanium, magnesium, or alloys thereof. This makes it easier to construct and dismantle the formwork 1.

When the panel member 10 is formed using a thermoplastic resin and the retaining member 20 is formed using iron, aluminum, copper, titanium, magnesium, or an alloy of these, the properties of the thermoplastic resin improve the quality of the concrete that is poured and hardened, and because the retaining member 20 is made of metal, the rigidity of the formwork unit 100 can be ensured.

1: Formwork for pouring concrete material 2: Concrete material pouring area 100: Formwork unit 10: Panel member 11: Front surface 12: Back surface 13: Side surface 20: Retaining member 21: Back portion 30: Support portion 33: Base portion 34: Convex portion 34a: Side wall 34b: Top portion 35a, 35b: Connection rib 36: First through hole 37: Second through hole 38: Side wall rib 40: Edge portion 41: Bulging surface 50: Claw (engagement portion)

Claims (5)

A form for pouring concrete material used to define a concrete material pouring area, comprising:
A panel member having a front surface facing the concrete material pouring area, a back surface opposite to the front surface, and a side surface connecting the front surface and the back surface;
A form unit having a holding member for holding the panel member,
The holding member is
a support portion provided opposite the rear surface of the panel member and supporting the panel member;
an edge portion that protrudes from the support portion along the side surface of the panel member and surrounds the side surface,
The support portion has a base portion extending along the back surface of the panel member, and a plurality of hollow protrusions protruding from the base portion toward an opposite side to the panel member,
A first through hole is provided at the top of the protrusion and formed to penetrate the panel member in a direction intersecting the back surface of the panel member.
A formwork for pouring concrete material in which the formwork units are arranged side by side. A form for pouring concrete material used to define a concrete material pouring area, comprising:
A panel member having a front surface facing the concrete material pouring area, a back surface opposite to the front surface, and a side surface connecting the front surface and the back surface;
A form unit having a holding member for holding the panel member,
The holding member is
a support portion provided opposite the rear surface of the panel member and supporting the panel member;
an edge portion that protrudes from the support portion along the side surface of the panel member and surrounds the side surface,
The support portion has a base portion extending along the back surface of the panel member, and a plurality of hollow protrusions protruding from the base portion toward an opposite side to the panel member,
The support portion is
a second through hole formed in a side wall of the protruding portion so as to penetrate in a direction along the rear surface of the panel member;
A side wall rib is provided between a periphery of the second through hole and a top of the protrusion to reinforce the side wall.
A formwork for pouring concrete material in which the formwork units are arranged side by side. A form for pouring concrete material used to define a concrete material pouring area, comprising:
A panel member having a front surface facing the concrete material pouring area, a back surface opposite to the front surface, and a side surface connecting the front surface and the back surface;
A form unit having a holding member for holding the panel member,
The holding member is
a support portion provided opposite the rear surface of the panel member and supporting the panel member;
an edge portion that protrudes from the support portion along the side surface of the panel member and surrounds the side surface,
The support portion has a base portion extending along the back surface of the panel member, and a plurality of hollow protrusions protruding from the base portion toward an opposite side to the panel member,
The support portion further includes a connecting rib that connects adjacent protrusions to each other.
A formwork for pouring concrete material in which the formwork units are arranged side by side. The thickness of the connecting rib decreases with increasing distance from the base.
A formwork for pouring concrete materials according to claim 3. A form for pouring concrete material used to define a concrete material pouring area, comprising:
A hollow panel member having a front surface facing the concrete material pouring area, a back surface opposite to the front surface, and a side surface connecting the front surface and the back surface;
A form unit having a holding member for holding the panel member,
The holding member is
a support portion provided opposite the rear surface of the panel member and supporting the panel member;
an edge portion that protrudes from the support portion along the side surface of the panel member and surrounds the side surface,
The support portion has a base portion extending along the back surface of the panel member, and a plurality of hollow protrusions protruding from the base portion toward an opposite side to the panel member,
The holding member further includes an engagement portion provided on the edge portion and adapted to detachably engage with the panel member,
The engagement portion protrudes inward from the edge portion and is inserted into the side surface of the panel member.
A formwork for pouring concrete material in which the formwork units are arranged side by side.

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