JP6820541B2 - Formwork for concrete placement and concrete placement method - Google Patents

Description

The present invention relates to a concrete casting formwork and a concrete placing method.

Formwork for placing concrete has been proposed for constructing concrete structures such as dams. For example, Patent Document 1 describes a concrete casting formwork formed of a water-permeable and breathable air-permeable synthetic resin plate and having a plurality of hollow portions communicating from one end face to the other end face. Is disclosed.

Japanese Unexamined Patent Publication No. 3-271463

By the way, when curing the cast concrete, it is necessary to maintain the temperature of the cast concrete, and it is desired that the concrete casting formwork has high heat retention. However, the concrete casting formwork as described above has insufficient heat retention, and improvement is desired. Further, when a part of the concrete casting formwork as in the above technique is damaged or deteriorated, the concrete casting formwork becomes unusable as a whole, and improvement is desired in this respect as well. ..

Therefore, the present invention provides a concrete casting formwork and a concrete placing method in which the heat retention of the cast concrete is improved and the response to damage and deterioration of the concrete placing formwork is also improved. With the goal.

According to the present invention, a first formwork panel installed on a concrete casting surface and a second formwork panel that is stacked on the first formwork panel from the opposite side of the concrete casting surface and detachably joined to the first formwork panel. A formwork panel and a reinforcing material for reinforcing the second formwork panel from the opposite side of the concrete casting surface are provided, and the first formwork panel has a flat plate-shaped casting surface side skin layer in contact with the concrete casting surface. , A hollow polygonal column between the flat reinforcing material side skin layer that is in contact with the second formwork panel and parallel to the casting surface side skin layer, and the casting surface side skin layer and the reinforcing material side skin layer. A plurality of cells having either a shape or a hollow cylindrical shape are installed adjacent to each other while the outer peripheral portion of the bottom surface of the cell is in contact with the casting surface side skin layer and the reinforcing material side skin layer. It is a concrete casting formwork having a layer.

According to this configuration, the first formwork panel of the concrete casting formwork has a flat plate-shaped casting surface side skin layer in contact with the concrete casting surface and a casting surface side skin in contact with the second formwork panel. A plurality of cells forming either a hollow polygonal column shape or a hollow columnar shape between the flat plate-shaped reinforcing material side skin layer parallel to the layer and the casting surface side skin layer and the reinforcing material side skin layer. However, since each outer peripheral portion of the bottom surface of the cell has a cell layer installed adjacent to each other while being in contact with the skin layer on the casting surface side and the skin layer on the reinforcing material side, heat is generated by the air inside the cell. Mediators can be reduced, thermal conductivity can be reduced, and heat retention can be improved. Further, since the first formwork panel installed on the concrete casting surface is detachable from the second formwork panel and the reinforcing material, if the first formwork panel is damaged or deteriorated, the first formwork panel Only the concrete casting formwork needs to be replaced, and the response to damage and deterioration of the concrete casting formwork can be improved.

In this case, it is preferable that each of the side surfaces of the cell includes a communication portion that communicates between the insides of cells adjacent to each other so that gas can flow.

According to this configuration, since each of the side surfaces of the cell includes a communication portion that communicates between the insides of cells adjacent to each other so that gas can flow, the heat retention property against an increase in temperature can also be improved. it can.

In this case, the first formwork panel and the second formwork panel are screwed into the second formwork panel from the reinforcing material side, penetrate the second formwork panel, and the cell layer of the first formwork panel. It is preferable that the tip is detachably joined by a screw reaching the tip.

According to this configuration, the first formwork panel and the second formwork panel are screwed into the second formwork panel from the reinforcing material side, penetrate the second formwork panel, and the first formwork panel. Since the tip of the cell layer is detachably joined by screws, the first formwork panel and the second formwork panel can be easily joined and separated with only screws.

Further, in this case, the screw penetrates the elastic flat plate member installed on at least one of the surface of the second formwork panel on the reinforcing material side and the surface of the first formwork panel in contact with the second formwork panel. It is preferable that it is screwed in.

According to this configuration, the screw penetrates an elastic flat plate member installed on at least one of the surface of the second formwork panel on the reinforcing material side and the surface of the first formwork panel in contact with the second formwork panel. Since it is screwed in while doing so, it is possible to prevent the screw from coming off.

Further, the present invention comprises a formwork installation step of installing the concrete casting formwork of the present invention on the concrete placing surface, a placing step of placing concrete on the concrete placing surface, and a formwork setting step. The first formwork panel is left on the concrete placing surface where the first formwork panel is installed, and the concrete placing surface where the concrete is placed in the placing process. This is a concrete placing method including a leaving step of removing the second form panel and the reinforcing material from the first form panel.

According to this configuration, the first formwork panel is left on the concrete placing surface where the concrete was placed in the placing process by the leaving process, and the first formwork panel to the second formwork panel and the reinforcing material are separated. Since it is removed, the effect of heat-retaining and curing the concrete by the leftover first formwork panel can be maintained. In addition, since the remaining first formwork panel is lightweight, the work of removing and moving it after the curing is completed becomes easier.

In this case, in the formwork installation process, the tie bolts penetrating the first formwork panel and the second formwork panel from the opposite side of the concrete casting surface and the tie bolts are attached to the tie bolts on the side of the reinforcing material of the second formwork panel. The concrete casting formwork of the present invention is fixed by the formed formwork, and in the remaining step, the nut is removed from the tie bolts, the second formwork panel and the reinforcing material are removed from the first formwork panel, and then the first formwork is used. It is preferable to attach the nut to the tie bolt on the side of the 1 formwork panel that was in contact with the 2nd formwork panel.

According to this configuration, in the remaining process, the nut attached to the tie bolt is removed from the tie bolt in the formwork installation process, the second formwork panel and the reinforcing material are removed from the first formwork panel, and then the first formwork panel. Since the nuts are attached to the tie bolts on the surface that was in contact with the second formwork panel, the first formwork panel can be fixed to the concrete casting surface using the nuts used in the formwork installation process. Work efficiency can be improved by using common parts.

In addition, the first formwork panel left by the leaving process is removed from the concrete casting surface, and the first formwork panel removed from the concrete casting surface is removed from the concrete casting surface. It is preferable to further include a second formwork panel removed from the panel and a rejoining step of joining the reinforcing material.

According to this configuration, the first formwork panel removed from the concrete casting surface in the removal step by the rejoining step has the second formwork panel and the reinforcing material removed from the first formwork panel in the remaining step. Since it can be rejoined and diverted to the formwork installation process in other areas, the first formwork panel and the second formwork can be obtained while obtaining the effect of heat retention and curing by the first formwork panel in the remaining process. The efficiency of diversion of panels and reinforcements in multiple areas can be improved.

According to the concrete casting formwork and the concrete placing method of the present invention, it is possible to improve the heat retention of the placed concrete and also improve the response to damage and deterioration of the concrete placing formwork. become.

(A) is a view of the concrete casting formwork according to the embodiment as viewed from the opposite side of the concrete casting surface, (B) is a left side view of (A), and (C) is (A). It is a plan view of. (A) is a perspective view of the first formwork panel according to the embodiment, and (B) is an enlarged view of the cell of (A). (A) is a perspective view showing a strip-shaped sheet forming a side surface of the cell, (B) is a perspective view showing a wavy sheet in which the strip-shaped sheet of (A) is bent, and (C) is a perspective view of (B). It is a perspective view which shows the state which formed the cell by abutting the corrugated sheets with each other. (A) is a perspective view showing a state in which the first formwork panel and the second formwork panel are started to be joined, and (B) is the start of joining the first formwork panel and the second formwork panel. It is a vertical cross-sectional view which shows the state, and (C) is a vertical cross-sectional view which shows the state which the 1st formwork panel and the 2nd formwork panel are joined. (A) is a view of the concrete casting formwork of FIG. 1 (A) connected to each other as viewed from the opposite side of the concrete casting surface, and (B) is a left side view of (A). , (C) is a plan view of (A). (A) is a view of an object having a horizontal end thickness fixed to the object of FIG. 5 (A) viewed from the opposite side of the concrete casting surface, and (B) is a left side view of (A), (C). ) Is a plan view of (A). (A) is a view of an object having a vertical end thickness fixed to the object of FIG. 6 (A) viewed from the opposite side of the concrete placing surface, and (B) is a left side view of (A), (C). ) Is a plan view of (A). (A) is a view of a large slide formwork in which the scaffolding material and the scaffolding material are fixed to the object of FIG. 7 (A) as viewed from the opposite side of the concrete placing surface, and (B) is the left side surface of (A). It is a figure, (C) is a plan view of (A). (A) is a view of the state in which the large slide formwork of FIG. 8 (A) is installed on the concrete placing surface from the opposite side of the concrete placing surface, and (B) is the left side view of (A). (C) is a plan view of (A). 9 (B) is an enlarged view of the periphery of the P-con. (A) is a view of the state in which the large slide formwork of FIG. 9 (A) is moved upward from the opposite side of the concrete placing surface, and (B) is a left side view of (A). , (C) is a plan view of (A). 9 (B) is an enlarged view of the periphery of the P-con, the curing piece, the tie bolt, the formwork binding bracket, and the nut. It is a figure which shows the state which removed the formwork binding metal fitting and the nut from the tie bolt of FIG. It is a figure which shows the state which removed the 2nd formwork panel, the reinforcing material, the horizontal end thickness, the vertical end thickness, etc. from the 1st formwork panel of FIG. It is a figure which shows the state which attached the nut to the tie bolt of FIG. 14 and fixed the 1st formwork panel. It is a figure which shows the state which removed the nut and the tie bolt from the concrete placing surface of FIG. It is a figure which shows the state which the 1st formwork panel was removed from the concrete casting surface of FIG. The second formwork panel, reinforcing material, horizontal end thickness, vertical end thickness, etc. removed from the first formwork panel in FIG. 14 are joined to the first formwork panel removed from the concrete casting surface in FIG. It is a figure which shows the state. (A), (B), (C) and (D) are diagrams showing a process in which concrete placing and curing proceed in each area using the concrete placing formwork according to the embodiment. .. It is a graph which shows the history of the temperature of concrete during curing in an experimental example.

As shown in FIGS. 1 (A), 1 (B) and 1 (C), the concrete casting formwork 1 of the present embodiment has a rectangular shape when viewed from the opposite side of the concrete casting surface. Have. The concrete casting formwork 1 has, for example, a size of 1500 [mm] in length × 300 [mm] in width, but the size of one concrete casting formwork 1 can be appropriately changed. ..

The concrete casting formwork 1 includes a first formwork panel 10 installed on the concrete casting surface and a first formwork panel 10 which is overlapped with the first formwork panel 10 from the opposite side of the concrete casting surface. It includes a second formwork panel 20 that is detachably joined, and a reinforcing material 30 that reinforces the second formwork panel 20 from the opposite side of the concrete casting surface. The reinforcing material 30 is formed of, for example, iron, aluminum, copper, titanium, magnesium, alloys thereof, or synthetic resin.

The reinforcing material 30 has a flat plate member that covers the outer periphery of the concrete casting formwork 1. Further, the reinforcing material 30 extends parallel to the short side of the concrete casting formwork 1 from the opposite side of the concrete casting surface and from the opposite side of the concrete casting surface to the concrete casting formwork 1 from the viewpoint. It has a flat plate member arranged so as to divide a pair of long sides into six parts. Further, the reinforcing material 30 extends parallel to the long side of the concrete casting formwork 1 from the opposite side of the concrete casting surface and from the opposite side of the concrete casting surface to the concrete casting formwork 1 from the viewpoint. It has a flat plate member arranged so as to divide a pair of short sides into two. On the side of the concrete casting formwork 1 opposite to the concrete casting surface, the portion of the second formwork panel 20 that is not in contact with the reinforcing material 30 is exposed.

The flat plate member that covers the outer periphery of the concrete casting formwork 1 of the reinforcing material 30 includes a plurality of bolt holes 32. By the bolts inserted into the bolt holes 32 and the nuts attached to the bolts, the plurality of concrete casting formwork 1s are connected to each other outside the concrete placing construction site and the concrete placing construction site. It is possible to be done. Further, the reinforcing material 30, the first formwork panel 10 and the second formwork panel can be cut and divided into arbitrary sizes outside the concrete placing construction site and the concrete placing construction site.

As shown in FIG. 2A, the first formwork panel 10 has a casting surface side skin layer 11, a reinforcing material side skin layer 12, and a cell layer 13. The casting surface side skin layer 11, the reinforcing material side skin layer 12, and the cell layer 13 are formed of a thermoplastic resin such as polypropylene. The skin layer 11 on the casting surface side is in contact with the concrete casting surface and has a flat plate shape. The reinforcing material side skin layer 12 is in contact with the second formwork panel 20 and is parallel to the casting surface side skin layer 11 and has a flat plate shape.

As shown in FIGS. 2 (A) and 2 (B), the cell layer 13 is a plurality of cells forming a hollow regular hexagonal prism shape between the casting surface side skin layer 11 and the reinforcing material side skin layer 12. 14 is installed adjacent to each other while the outer peripheral portions 15 of the bottom surface of the cell 14 are in contact with the casting surface side skin layer 11 and the reinforcing material side skin layer 12. As shown in FIG. 2B, each of the side surfaces 16 of the cell 14 includes a communication portion 17 that communicates between the insides of the cells 14 adjacent to each other so that gas can flow.

As shown in FIGS. 3 (A), 3 (B) and 3 (C), each of the side surfaces 16 of the cell 14 has a wavy shape produced by continuously bending the strip-shaped sheet 160 in a staggered direction. It is formed from sheet 161. The wavy sheet 161 is formed in a substantially wavy shape in which trapezoidal undulations obtained by dividing a regular hexagon into two by the longest diagonal line are continuously provided, and includes a bending portion 162 which is a bending portion. As shown in FIG. 3C, each of the side surfaces 16 of the cell 14 is formed by a pair of wavy sheets 161 bent in consecutive alternating directions abutting each other at the bent portions 162.

As shown in FIG. 2B, the pair of wavy sheets 161 that are in contact with each other are separated from each other by the internal pressure of the cell 14, and the communication portion 17 is adjacent to each other because the pair of wavy sheets 161 are separated from each other. The gas is communicated between the insides of the cells 14 so that the gas can flow. As shown in FIG. 2B, each outer peripheral portion 15 of the bottom surface of the cell 14 may or may not be joined to the casting surface side skin layer 11 and the reinforcing material side skin layer 12. It is also good.

In addition to the hollow regular hexagonal prism, the cell 14 has a hollow cylindrical shape, a hollow triangular prism shape, a hollow square prism shape, a hollow hexagonal prism shape other than the regular hexagonal prism shape, and the like. It may have cells 14 having different shapes, and cells 14 having different shapes may be mixed. For example, each of the side surfaces 16 of the hollow cylindrical cell 14 can be formed by a pair of wavy sheets 161 that are continuously curved in alternating directions and abut each other at the curved portions. .. Further, each side surface of the cell 14 is formed by an independent cell wall for each cell 14, and the communication portion 17 is a cell adjacent to each other by an opening, a slit, a valve or the like provided in the cell wall. A gas may be communicated between the insides of the 14 so that the gas can flow.

As shown in FIG. 4A, the second formwork panel 20 has a casting surface side skin layer 21 similar to the casting surface side skin layer 11 of the first formwork panel 10, and the first mold. It has a reinforcing material side skin layer 22 similar to the reinforcing material side skin layer 12 of the frame panel 10, and a cell layer 23 similar to the cell layer 13 of the first formwork panel 10 described above. The cell layer 23 has a cell 24, an outer peripheral portion 25, a side surface 26, and a communicating portion 17 similar to the cell 14, the outer peripheral portion 15, the side surface 16, and the communicating portion 17 of the cell layer 13. For example, the positions of the cell 14 and the cell 24 and the positions of the outer peripheral portion 15 and the outer peripheral portion 25 of the first formwork panel 10 and the second formwork panel 20 are the same when viewed from the concrete casting surface. It is layered on. The positions of the cell 14 and the cell 24 and the positions of the outer peripheral portion 15 and the outer peripheral portion 25 of the first formwork panel 10 and the second formwork panel 20 are not necessarily the same when viewed from the concrete casting surface. It does not have to be.

As shown in FIGS. 4 (A), 4 (B), and 4 (C), the first formwork panel 10 and the second formwork panel 20 are the second formwork panel 20 from the side of the reinforcing material 30. It is screwed into the second mold panel 20 and is detachably joined by a screw 40 whose tip reaches the cell layer 13 of the first mold panel 10. The screw 40 penetrates the elastic flat plate member 50 installed on at least one of the surface of the second formwork panel 20 on the side of the reinforcing member 30 and the surface of the first formwork panel 10 in contact with the second formwork panel. It is screwed in while doing.

The hole for the screw 40 to penetrate the second formwork panel 20 is a reinforcing material of the skin layer 22 on the reinforcing material side of the second formwork panel 20 outside the concrete placing construction site and the concrete placing construction site. It can be arbitrarily bored in an exposed portion that is not in contact with 30. Further, as the flat plate member 50, for example, a rubber disk-shaped member having a hole through which a screw 40 passes is formed in the center of the disk can be applied.

The second formwork panel 20 does not necessarily have the same structure as the first formwork panel 10, and may be, for example, a flat plate member formed of a thermoplastic resin such as polypropylene. It is not necessary to have 24, a communication unit 27, and the like. Further, the first formwork panel 10 and the second formwork panel 20 may be joined by an adhesive tape, metal fittings, or the like.

Hereinafter, a concrete placing method using the concrete placing formwork 1 of the present embodiment will be described. As shown in FIGS. 5 (A), 5 (B) and 5 (C), the concrete casting formwork 1 is cut and divided into arbitrary sizes. In the examples of FIGS. 5 (A), 5 (B) and 5 (C), in addition to the concrete casting formwork 1 described above, the concrete casting formwork viewed from the opposite side of the concrete casting surface. A concrete casting formwork 1d in which the long side of 1 is cut and divided into 1/5 length is prepared.

A connecting step of connecting a plurality of concrete casting formwork 1 to each other is performed by the bolt inserted into the bolt hole portion 32 of the reinforcing material 30 and the nut attached to the bolt. In the examples of FIGS. 5 (A), 5 (B) and 5 (C), two concretes are formed in the direction along the long side of the concrete casting formwork 1 from the opposite side of the concrete placing surface to the viewpoint. The casting formwork 1 and the above-mentioned cut and divided concrete casting formwork 1d are connected to each other. In addition, the concrete casting formwork cut and divided from the above two concrete casting formwork 1 in the direction along the short side of the concrete placing formwork 1 from the opposite side of the concrete placing surface. Ten concrete casting formwork 1l connected to the frame 1d are connected to each other to form a concrete casting formwork 1A. The connecting process can be performed either at the concrete placing construction site or outside the concrete placing construction site.

As shown in FIGS. 6 (A), 6 (B), and 6 (C), the horizontal end thickness 61 is attached to the concrete casting formwork 1A in which the concrete casting formwork 1 is connected to each other in the connecting process. Is fixed by bolts and nuts (not shown). Further, as shown in FIGS. 7 (A), 7 (B) and 7 (C), the vertical end thickness 62 is attached to the horizontal end thickness 61 of the object in which the horizontal end thickness 61 is fixed in the horizontal end thickness fixing step. A vertical end thick fixing step is performed in which is fixed by bolts and nuts (not shown). The horizontal end thick fixing step and the vertical end thick fixing step can be performed at both the concrete placing construction site and the outside of the concrete placing construction site.

As shown in FIGS. 8 (A), 8 (B) and 8 (C), the scaffolding material 63 and the scaffolding receiver are attached to the vertical end thickness 62 of the object in which the vertical end thickness 62 is fixed in the vertical end thickness fixing step. A scaffold fixing step is performed in which the material 64 and the scaffold support frame 65 are fixed by bolts and nuts (not shown). The scaffolding fixing process can be performed either at the concrete placing construction site or outside the concrete placing construction site. When the scaffold fixing step is completed, the large slide formwork 100 is formed.

The following steps are performed at the concrete placement construction site. As shown in FIGS. 9 (A), 9 (B) and 9 (C), the concrete casting formwork 1A of the large slide formwork 100 to which the scaffolding material 63 and the like are fixed in the scaffolding fixing step is concrete casting. mold setting step to be installed in設面S ₀ is performed. In the example of FIG. 9 (B), the at construction site concreting, the concrete C already up concrete設面S ₁ are pouring large sliding formwork 100, concrete設面S ₀ of the concrete C Will be installed in.

As shown in FIGS. 9 (B), 9 (C) and 10, in the formwork installation process, the concrete placement of the concrete placement surface side skin layer 11 of the concrete placement formwork 1A of the large slide formwork 100 while attaching the P configuration 73 to the surface in contact with the surface S _0, concrete設用formwork 1 large sliding formwork 100 is installed. In the formwork installation process, the formwork support member 72 extending from the differential anchor 71 embedded in the concrete casting surface S1 and the concrete casting formwork 1 of the large slide formwork 100 are formed by the P-con 73 and the curing piece. It is connected by 74, a tie bolt 75, a formwork binding metal fitting 76, and a nut 77. The P-con 73, the curing piece 74, the tie bolt 75, the formwork binding metal fitting 76 and the nut 77 function as a connecting member 70 for connecting the formwork supporting member 72 and the large slide formwork 100. In the present embodiment, Sasuji anchor 71 and the mold支保member 72 is disposed on a side of the concrete設面S ₀ Large sliding formwork 100.

As shown in FIG. 10, the formwork support member 72 is connected to the P-con 73. Tatetan thickness 62 from the opposite side of the concrete設面S _0, tie bolts 75 extending through the second mold frame panel 20 and the first mold frame panel 10 is screwed into the P Con 73. And tie bolts 75 extending through the Tatetan thickness 62, the second mold frame panel 20 and the first mold frame panel 10 from the opposite side of the concrete設面S _0, opposite to the concrete設面S ₀ of TatetanFutoshi 62 the nut 77 which is attached to the tie bolt 75 at the surface, concrete設用formwork 1 large sliding formwork 100 is fixed to the concrete設面S _0. In the present embodiment, the tie bolt 75 penetrating the vertical end thickness 62 is fixed to the concrete casting formwork 1A by the nut 77, but the second formwork panel 20 and the second formwork panel 20 and the second formwork without penetrating the vertical end thickness 62 are fixed. 1 The tie bolt 75 penetrating the formwork panel 10 may be fixed by the nut 77. Further, members other than the vertical end thickness 62 of the large slide formwork 100 such as the horizontal end thickness 61, and the tie bolt 75 penetrating the second formwork panel 20 and the first formwork panel 10 may be fixed by the nut 77. ..

The holes for the tie bolts 75 to penetrate the second formwork panel 20 and the first formwork panel 10 are provided in the reinforcing material 30 of the skin layer 22 on the reinforcing material side of the second formwork panel 20 at the construction site of concrete placement. It can be arbitrarily drilled in the exposed part that is not in contact. Further, a formwork binding metal fitting 76 is interposed between the surface of the vertical end thickness 62 opposite to the concrete casting surface S0 and the nut 77.

In the formwork installation step, a curing piece 74 having a width W larger than the diameter d of the portion of the P-con 73 facing the casting surface side skin layer 11 is placed between the P-con 73 and the casting surface side skin layer 11. The P-con 73 is attached through the pipe. The curing piece 74 has an inner diameter of about 14 [mm] at the center of a disk-shaped member having an outer diameter of 80 [mm] and a thickness of about 1 to 2 [mm] formed of, for example, a thermoplastic resin such as polypropylene. It is possible to apply an object including a hole of.

As shown in FIG. 9 (B), the mold setting step hit the concrete C in the first formwork panel 10 concrete設面S ₀ which is installed in the concrete設用formwork 1A large sliding formwork 100 The casting process to set up is performed. For example, the concrete C is pouring up concrete設面S _2.

FIG. 11 (A), the as shown in FIG. 11 (B) and FIG. 11 (C), the the pouring and curing of concrete C to concrete設面_{S 2,} S 3, _{S 4} is completed, large slide A formwork moving step of moving the frame 100 upward is performed. The above-mentioned formwork installation step and casting step are performed again on the large slide formwork 100 that has been moved upward by the formwork moving step. At the concrete casting construction site, the above-mentioned formwork installation process, formwork process, and formwork movement process are sequentially and repeatedly performed.

In the present embodiment, while leaving the first formwork panel 10 in concrete設面S ₀ which is Da設concrete C in about hitting設工, second formwork panel 20 and the reinforcing member from the first formwork panel 10 A leaving step of removing 30 may be performed.

As shown in FIG. 12, in the mold installing step, the tie bolt 75 extending through the concrete設面S first formwork panel 10 and the second formwork panel 20 from the opposite side of _0, the second type frame panels 20 The concrete casting formwork 1A is fixed by the nut 77 attached to the tie bolt 75 on the side surface of the reinforcing member 30. After the placing step, the leaving step is performed after the curing of the placed concrete C has progressed to an arbitrary state. As shown in FIG. 13, in the leaving step, the nut 77 is removed from the tie bolt 75.

As shown in FIG. 14, after the screws 40 and the flat plate member 50 that joined the first formwork panel 10 and the second formwork panel 20 were removed, the first formwork panel 10 to the second mold The frame panel 20, the reinforcing material 30, the horizontal end thickness 61, the vertical end thickness 62, the scaffolding material 63, the scaffolding receiving material 64, and the scaffolding support frame 65 are removed. As shown in FIG. 15, after the second formwork panel 20 and the reinforcing material 30 are removed from the first formwork panel 10, the surface of the first formwork panel 10 in contact with the second formwork panel 20. The nut 77 is attached to the tie bolt 75.

When incubated cured by the first formwork panel 10 is completed, remove the step of removing the first mold frame panel 10 is left by leaving step from concrete設面S ₀ is performed. As shown in FIG. 16, in the removal step, from concrete設面S _0, nuts 77 and tie bolt 75 is removed. As shown in FIG. 17, the first formwork panel 10 is left by leaving step is removed from the concrete設面S _0.

As shown in FIG. 18, the first mold frame panel 10 which is removed from the concrete設面S ₀ at removal step, the second mold frame panel 20, reinforcement is removed from the first mold frame panel 10 by leaving step 30, a rejoining step of joining the horizontal end thickness 61, the vertical end thickness 62, the scaffolding material 63, the scaffolding receiving material 64, and the scaffolding support frame 65 is performed. The first formwork panel 10 and the second formwork panel 20 are rejoined by the screws 40 and the flat plate member 50, and the large slide formwork 100 is reassembled.

Placing and curing of concrete C including a leaving step, a removing step and a rejoining step in the formwork setting step, the casting step and the formwork moving step may be performed as follows. For example, as shown in FIG. 19 (A), at a concrete casting construction site where areas A ₁ , A ₂ , A ₃ , and A ₄ are located, in area A ₁ , formwork is installed by concrete casting formwork 1A. The process and casting process are completed. As shown in FIG. 19 (B), in the region A _1, leaving step is performed, heat insulation curing the first formwork panel 10 is left is performed. In zone A _2, mold installation step and pouring process is completed.

As shown in FIG. 19 (C), in the region A _1, curing is complete, removal step is carried out, first formwork panel 10 is left by leaving step is removed from the concrete設面. Further, in the region A _2, leaving step is performed, heat insulation curing the first formwork panel 10 is left is performed. A first mold frame panel 10 which is removed by the removal process in the area A _1, and the second type frame panels 20 and the reinforcing member 30 is detached from the first mold frame panel 10 by leaving step in the area A _2, zone A Moved to ₃ . In zone A _3, a first mold frame panel 10 which is removed by the removal process in the area A _1, the second type frame is detached from the first mold frame panel 10 by leaving step in zone A ₂ panel 20 and the reinforcing member 30 Etc. are rejoined by the rejoining step. In zone A _3, the concrete設用mold 1A joined by rejoining process, the mold setting step and pouring step.

As shown in FIG. 19 (D), in the region A _2, curing is complete, removal step is carried out, first formwork panel 10 is removed, which is left behind by leaving step. Further, in the region A _3, leaving step is performed, heat insulation curing the first formwork panel 10 is left is performed. A first mold frame panel 10 which is removed by the removal process in the area A _2, and the second type frame panels 20 and the reinforcing member 30 is detached from the first mold frame panel 10 by leaving step in the area A _3, section A Moved to ₄ . In zone A _4, a first mold frame panel 10 which is removed by the removal process in the area A _2, the second type frame is detached from the first mold frame panel 10 by leaving step in zone A ₃ panel 20 and the reinforcing member 30 Etc. are rejoined by the rejoining step. In zone A _4, the concrete設用mold 1A joined by rejoining process, the mold setting step and pouring step. The place and order in which the formwork installation step, the casting step, the formwork moving step, the leaving step, the removing step, and the rejoining step are performed may be arbitrarily changed.

Conventionally, when concrete is placed in an environment such as winter when the outside temperature is 0 [° C] or less, the strength of the concrete is 5 [N / N /] in order to prevent the influence of the initial frost damage of the placed concrete. It is necessary to keep the temperature of concrete at 5 ° C or higher until it reaches mm ² ]. As a concrete curing method in the above environment, there are methods such as heat curing, heat insulation curing, and covering curing. Of these, as an example of the heat insulation curing method, the concrete surface and concrete casting formwork are covered with a highly heat-insulating high-foaming polyethylene sheet or closed cell sheet for curing, and the heat of hydration of the concrete is used. There is a method of keeping the temperature of concrete above 5 [° C].

However, the above method requires labor to cover the concrete surface, formwork, etc. with a sheet. Further, in the above method, if the sheet is torn, the heat retaining effect is reduced, the sheet needs to be reattached, and the running cost may increase. Further, in the above method, the sheet is scattered by the wind, so that the sheet needs to be reattached, which may increase the running cost.

Further, as a formwork for placing concrete, a wooden or steel formwork is known. In recent years, for the purpose of improving the efficiency of concrete casting work using formwork, steel formwork with high strength and number of diversions has been used instead of wooden formwork to increase the number of diversions of formwork and formwork. In many cases, the size of the formwork is increased. When the formwork is made of steel, the thermal conductivity of iron is relatively high (83.5 [W / mK]), and in order to prevent the concrete temperature from rising or falling sharply in summer or winter, the formwork is used. However, curing measures are required. As a curing method for the mold, there are a method of attaching a closed cell sheet to the back surface of the mold and a method of covering the mold with a sheet made of synthetic resin such as polyethylene and supplying heat using an eye lamp.

However, the drawbacks of the method of attaching the sheet to the back surface of the mold are as described above. In addition, the method of supplying heat using an eye lamp has a drawback that it requires labor for electrical wiring of the eye lamp, an increase in cost due to the material cost of the electric cable, and labor for installation and removal of the eye lamp. In addition, when trying to increase the size of a steel formwork, the specific gravity of iron is as heavy as 7.9 [g / cm ³ ], so the weight of the formwork increases, and lifting machines such as cranes that handle the formwork also become large. There is a drawback that it is disadvantageous for workability in a narrow part due to the increase in size. Further, in the concrete casting formwork provided with the hollow portion as in Patent Document 1 described above, since the hollow portion has a tubular shape that communicates from one end face to the other end face, the outer circumference of the resin plate is covered. It has the disadvantage that it is easily affected by the outside air temperature and the air in the hollow part tends to become cold in winter.

On the other hand, in this embodiment, the first formwork panel 10 of concrete設用mold 1 includes a flat striking設面side skin layer 11 in contact with the concrete設面S _0, the second type frame panels 20 A hollow hexagonal column shape is formed between the flat reinforcing material side skin layer 12 which is in contact with the casting surface side skin layer 11 and parallel to the casting surface side skin layer 11, and the casting surface side skin layer 11 and the reinforcing material side skin layer 12. Since the plurality of cells 14 have the outer peripheral portions 15 of the bottom surface of the cells 14 in contact with the casting surface side skin layer 11 and the reinforcing material side skin layer 12, and the cell layers 13 installed adjacent to each other. , The air inside the cell 14 can reduce heat mediators, reduce thermal conductivity and improve heat retention. Therefore, even in an environment such as winter when the outside air temperature is 0 [° C.] or less, by using the concrete casting formwork 1 of the present embodiment, the labor and labor required conventionally as described above and In order to prevent the influence of the initial frost damage of concrete while reducing the cost, it is possible to keep the temperature of concrete at 5 ° C. or higher until the strength of concrete reaches 5 [N / mm ² ].

Further, since each of the side surfaces 16 of the cell 14 includes a communication portion 17 that communicates between the insides of the cells 14 adjacent to each other so that the gas can flow, the temperature is increased when the temperature rises excessively. The pressure inside the cell 14 increases due to the rise of the cell 14, and the side surfaces 16 form and expand the communication portion 17 more apart from each other. Since the communicating portion 17 capable of communicating allows gas to pass through, an excessive temperature rise can be appropriately suppressed. Furthermore, the first formwork panel 10 installed in concrete設面S ₀ are the detachable second type frame panels 20 and the reinforcing member 30, when the first formwork panel 10 is damaged and degraded , Only the first formwork panel 10 needs to be replaced, and the response to damage and deterioration of the concrete casting formwork 1 can be improved.

Since the first formwork panel 10 and the second formwork panel 20 of the present embodiment are formed of a thermoplastic resin such as polypropylene, the thermal conductivity is 83.5 [W / mK] of iron. Since it is an extremely low 0.18 [W / mK], there is no need for curing using a sheet or the like. Therefore, the concrete casting formwork 1 of the present embodiment alone has a sufficient heat-retaining and curing effect.

Further, since the first mold panel 10 and the second mold panel 20 of the present embodiment are formed of a thermoplastic resin such as polypropylene, the specific gravity is 7.9 [g / cm ³ ] of iron. It is extremely light 0.9 [g / cm ³ ], which is about 1/9 of the specific gravity of iron. Therefore, even if the concrete casting formwork 1 is enlarged, the weight can be reduced as compared with the conventional steel formwork. Therefore, workability is improved due to weight reduction, and it becomes easy to recycle.

Further, since the first formwork panel 10 and the second formwork panel 20 of the present embodiment have a honeycomb structure and a structure in which the reinforcing material 30 is attached to the second formwork panel 20, it is a concrete casting mold. The frame 1 has the required strength. The surface to be installed in concrete設面S ₀ of the first formwork panel 10 also has a sufficient durability, it is possible to increase the diversion number. Further, since the surface of the first formwork panel 10 installed on the concrete casting surface S ₀ is smooth and hardly deformed, the smoothness of the concrete casting surface S ₀ can be improved.

Further, according to the present embodiment, the first formwork panel 10 and the second formwork panel 20 are screwed into the second formwork panel 20 from the side of the reinforcing material 30, and the second formwork panel 20 is formed. Since it is detachably joined by a screw 40 that penetrates and reaches the cell layer 13 of the first formwork panel 10 to the cell layer 13, the first formwork panel 10 and the second formwork panel 20 are joined and separated by screws. It can be easily done with only 40.

Further, according to the present embodiment, the screws 40 are installed on at least one of the surface of the second formwork panel 20 on the side of the reinforcing material 30 and the surface of the first formwork panel 10 in contact with the second formwork panel 20. Since it is screwed in while penetrating the flat plate member 50 having elasticity, it is possible to prevent the screw 40 from coming off.

Further, according to this embodiment, by leaving step, while the first formwork panel 10 is left on the concrete設面S ₀ which is Da設concrete C in about hitting設工, first from a first formwork panel 10 Since the 2 formwork panel 20 and the reinforcing material 30 are removed, the effect of heat retention and curing of the concrete C by the remaining 1st formwork panel 10 can be maintained. The first formwork panel 10 is disposed in the concrete after casting the concrete設面S _0, since the concrete after casting is also directly leaving, also in comparison with the method of attaching a curing sheet mold after demolding, the concrete C It is effective and efficient in that it adheres well and does not require replacement. Further, since the remaining first formwork panel 10 is lightweight, the work of removing and moving it after the completion of curing becomes easier.

Further, according to the present embodiment, in the leaving step, the nut 77 attached to the tie bolt 75 is removed from the tie bolt 75 in the formwork installation step, and the first formwork panel 10 to the second formwork panel 20 and the reinforcing material 30 are removed. After removal, in order to attach the nut 77 to the tie bolt 75 on the side of the first formwork panel 10 that was in contact with the second formwork panel 20, the first formwork using the nut 77 used in the formwork installation process. The form panel 10 can be fixed to the concrete casting surface S ₀ , and common parts can be used to improve work efficiency.

Further, according to this embodiment, by re-joining step, the first mold frame panel 10 which is removed from the concrete設面S ₀ at removal step, the second removed from the first mold frame panel 10 by leaving step Since the formwork panel 20 and the reinforcing material 30 are rejoined and can be diverted to the formwork installation process in other areas, the effect of heat retention and curing by the first formwork panel 10 in the remaining process can be obtained. It is possible to improve the efficiency of diverting the first formwork panel 10, the second formwork panel 20, and the reinforcing material 30 in a plurality of areas.

(Experimental example)
Hereinafter, an experimental example of this embodiment is shown. Using the concrete casting formwork 1 of the same size, concrete casting and curing were performed outdoors, and the history of the temperature of the concrete was measured. The same experiment was conducted for each of the concrete casting formwork 1 having a thickness of 10 [mm] and 30 [mm], which is the sum of the first formwork panel 10 and the second formwork panel 20. Also, for comparison, a similar experiment was conducted using steel formwork of the same size.

According to the result of FIG. 20, the temperature of the concrete placed and cured by the concrete casting formwork 1 of the present embodiment is the thickness of the first formwork panel 10 and the second formwork panel 20 combined. In both the results of 10 [mm] and 30 [mm], regardless of the fluctuation of the temperature of the outside air, the temperature is kept within the range of 22 [° C] or more from the second day after the placement, and the heat retention is high. It can be seen that it shows the height. On the other hand, the temperature of concrete that has been cast and cured with a steel formwork may be significantly below 20 [℃] from the second day after casting due to fluctuations in the temperature of the outside air, and has heat retention. It can be seen that it shows the low temperature of.

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. For example, by forming all of the first formwork panel 10, the second formwork panel 20, and the reinforcing material 30 with synthetic resin, it is possible to further reduce the weight, improve workability, and make it easier to reuse. ..

1,1d, 1l, 1A ... Concrete casting formwork, 10 ... First formwork panel, 11 ... Casting surface side skin layer, 12 ... Reinforcing material side skin layer, 13 ... Cell layer, 14 ... Cell, 15 ... outer circumference, 16 ... side surface, 17 ... communication part, 20 ... second formwork panel, 21 ... casting surface side skin layer, 22 ... reinforcing material side skin layer, 23 ... cell layer, 24 ... cell, 25 ... outer circumference Part, 26 ... Side surface, 27 ... Communication part, 30 ... Reinforcing material, 32 ... Bolt hole part, 40 ... Screw, 50 ... Flat plate member, 61 ... Horizontal end thickness, 62 ... Vertical end thickness, 63 ... Scaffolding material, 64 ... Scaffolding material, 65 ... Scaffolding support frame, 70 ... Connecting member, 71 ... Formwork anchor, 72 ... Formwork support member, 73 ... P-con, 74 ... Curing piece, 75 ... Tie bolt, 76 ... Formwork binding bracket, 77 ... Nut, 100 ... Large slide formwork, 160 ... Strip sheet, 161 ... Wavy sheet, 162 ... Bending part, S ₀ , S ₁ , S ₂ , S ₃ , S ₄ ... Concrete casting surface, C ... Concrete, d … Diameter, W… Width, A ₁ , A ₂ , A ₃ , A ₄ … Area.

Claims (5)

The first formwork panel installed on the concrete placement surface and
A second formwork panel that is overlapped with the first formwork panel from the opposite side of the concrete casting surface and is detachably joined to the first formwork panel.
A reinforcing material that reinforces the second formwork panel from the opposite side of the concrete casting surface, and
With
The first formwork panel
A flat plate-shaped skin layer on the casting surface side in contact with the concrete casting surface,
A flat plate-shaped reinforcing material side skin layer that is in contact with the second formwork panel and is parallel to the casting surface side skin layer.
A plurality of cells forming either a hollow polygonal prism shape or a hollow cylindrical shape between the casting surface side skin layer and the reinforcing material side skin layer form the outer peripheral portion of each of the bottom surfaces of the cells. A cell layer that is in contact with the casting surface side skin layer and the reinforcing material side skin layer and is installed adjacent to each other.
Have a,
The first formwork panel and the second formwork panel are formed of a thermoplastic resin.
A concrete casting formwork in which the first formwork panel and the second formwork panel are detachably joined by metal fittings . The first formwork panel installed on the concrete placement surface and
A second formwork panel that is overlapped with the first formwork panel from the opposite side of the concrete casting surface and is detachably joined to the first formwork panel.
A reinforcing material that reinforces the second formwork panel from the opposite side of the concrete casting surface, and
With
The first formwork panel
A flat plate-shaped skin layer on the casting surface side in contact with the concrete casting surface,
A flat plate-shaped reinforcing material side skin layer that is in contact with the second formwork panel and is parallel to the casting surface side skin layer.
A plurality of cells forming either a hollow polygonal prism shape or a hollow cylindrical shape between the casting surface side skin layer and the reinforcing material side skin layer form the outer peripheral portion of each of the bottom surfaces of the cells. A cell layer that is in contact with the casting surface side skin layer and the reinforcing material side skin layer and is installed adjacent to each other.
Have a,
The first formwork panel and the second formwork panel are screwed into the second formwork panel from the side of the reinforcing material, penetrate the second formwork panel, and the first formwork panel. A concrete casting formwork that is detachably joined by a screw whose tip reaches the cell layer . The formwork installation step of installing the concrete casting formwork according to claim 1 or 2 on the concrete casting surface, and
The placing process of placing concrete on the concrete placing surface and
In the formwork installation process, the concrete placement step of placing concrete on the concrete placement surface on which the first formwork panel is installed, and
Remaining step of removing the second formwork panel and the reinforcing material from the first formwork panel while leaving the first formwork panel on the concrete placing surface on which the concrete was placed in the casting step. When,
Concrete placing method equipped with. The first formwork panel installed on the concrete placing surface and the second formwork which is overlapped with the first formwork panel from the opposite side of the concrete placing surface and detachably joined to the first formwork panel. The first formwork panel includes a frame panel and a reinforcing material for reinforcing the second formwork panel from the opposite side of the concrete casting surface, and the first formwork panel is a flat plate-shaped casting surface in contact with the concrete casting surface. The side skin layer, the flat plate-shaped reinforcing material side skin layer that is in contact with the second formwork panel and parallel to the casting surface side skin layer, the casting surface side skin layer, and the reinforcing material side skin layer. A plurality of cells forming either a hollow polygonal column shape or a hollow columnar shape are in contact with the outer peripheral portion of the bottom surface of the cell in contact with the casting surface side skin layer and the reinforcing material side skin layer. In addition, a formwork installation step of installing a concrete casting formwork having cell layers installed adjacent to each other on the concrete placement surface,
The placing process of placing concrete on the concrete placing surface and
In the formwork installation process, the concrete placement step of placing concrete on the concrete placement surface on which the first formwork panel is installed, and
Remaining step of removing the second formwork panel and the reinforcing material from the first formwork panel while leaving the first formwork panel on the concrete placing surface on which the concrete was placed in the casting step. When,
Equipped with a,
In the formwork installation step, the tie bolts penetrating the first formwork panel and the second formwork panel from the opposite side of the concrete casting surface and the surface of the second formwork panel on the side of the reinforcing material. by a nut mounted on said tie bolt, to fix the concrete設用formwork,
In the leaving step, the nut is removed from the tie bolt, the second formwork panel and the reinforcing material are removed from the first formwork panel, and then the nut comes into contact with the second formwork panel of the first formwork panel. A concrete placing method in which the nut is attached to the tie bolt on the surface on the side where the formwork was used. A removal step of removing the first formwork panel left by the leaving step from the concrete casting surface, and
Rejoining the first formwork panel removed from the concrete casting surface in the removal step to join the second formwork panel removed from the first formwork panel in the remaining step and the reinforcing material. The concrete placing method according to claim 3 or 4 , further comprising a step.

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