Panel-type embedded formwork, concrete structure, and construction method thereof

Abstract

To provide a panel type buried mold, a concrete structural body and a construction method thereof, for which structural members are few, with a reduced construction work load and construction cost.SOLUTION: A panel type buried mold is provided with: a plurality of mold members 10 to be left as a part of a structure; a plurality of protruded members 30 protruded from the mold members 10; lateral connection members 50 suspended over a gap between adjacent protruded members 30. The lateral connection member 50 is to be a structural lateral member ( a hoop reinforcement) of a concrete structural body (a bridge leg) to be constructed, and the adjacent mold members 10 are connected through the lateral connection member 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a panel-type embedded formwork, a concrete structure, and a construction method thereof.

Background Art

[0002] Embedded formworks that are left as part of a structure have been known for a long time (see, for example, Patent Document 1). The formwork of Patent Document 1 is integrated with reinforcing bars, and includes a formwork member on one side, a stiffener plate connected to the formwork member, a longitudinal bar disposed through the stiffener plate, and a transverse bar bundled with the longitudinal bar. At the joint between the formwork members, although a flat bar is disposed as a joint assisting member from the reinforcing bar side, the stiffener plates connected to the respective formwork members are not connected. Therefore, in order to further reinforce this joint, a joint portion reinforcing member is disposed from the back side (opposite side to the reinforcing bar side) of the formwork member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the formwork of Patent Document 1, at the joint between the formwork members, since a flat bar for joining and a joint portion reinforcing member are attached, the construction is laborious and costly.

[0005] An object of the present invention is to provide a panel-type embedded formwork, a concrete structure, and a construction method thereof, which have fewer components and can reduce construction labor and construction costs.

Means for Solving the Problems

[0006] The first aspect of the present invention for solving such problems is a panel-type embedded formwork including a plurality of formwork members left as a part of a structure, a plurality of overhanging members protruding from the formwork members, and a connecting cross member spanned between adjacent overhanging members. The connecting cross member serves as a structural cross member of a concrete structure to be constructed, and adjacent formwork members are connected via the connecting cross member and Moreover, an auxiliary plate for assisting the joining of the formwork members is laid at the joining portion of the adjacent formwork members, and the protruding member is provided perpendicular to the auxiliary plate. is characterized by this.

[0007] According to the panel-type embedded formwork of the present invention, since the structural cross member of the concrete structure is used as the connecting cross member, the cross member can be effectively utilized and the number of constituent members can be reduced. Therefore, the construction labor and construction costs can be reduced. Furthermore, the formwork members can be firmly joined together. In addition, the present invention for solving the above problems includes a plurality of formwork members that are left as a part of the structure, a plurality of protruding members that protrude from the formwork members, and a connecting cross member that is spanned between the adjacent protruding members. The connecting cross member serves as a structural cross member of the concrete structure to be constructed, and the adjacent formwork members are connected via the connecting cross member. At the upper edge portion of the formwork member, a locking fitting for locking another panel-type embedded formwork adjacent above and a guide piece for guiding the panel-type embedded formwork adjacent above directly above the panel-type embedded formwork are provided. The locking fitting includes a locking portion for locking a bolt whose head is fixed with a gap between the formwork member of another panel-type embedded formwork adjacent above. The locking portion includes a step plate portion that separates from the formwork member and presses and locks the head of the bolt from the shaft portion side. The guide piece is inclined outward from the upper end of the step plate portion and includes an inclined guiding portion that enters the gap between the head of the bolt and the formwork member. It is a panel-type embedded formwork characterized by the above. According to the panel-type embedded formwork having the above configuration, since the structural cross member of the concrete structure is used as the connecting cross member, the cross member can be effectively utilized and the number of structural members can be reduced. Therefore, the construction labor and construction costs can be reduced. Furthermore, positioning can be easily performed when installing the upper panel-type embedded formwork.

[0008] In the panel-type embedded formwork of the present invention, it is preferable that the connecting cross member is a hoop bar surrounding a structural member erected in the concrete structure. According to such a configuration, column members such as bridge piers can be constructed.

[0009] In the panel-type embedded formwork of the present invention, it is preferable that the overhanging member is a separator supporting a formwork facing the formwork member. According to such a configuration, the opposing formwork can be supported at a predetermined position, and the rising portion of the foundation can be constructed.

[0012] The second aspect of the present invention for solving the above problems is a concrete structure including the panel-type embedded formwork according to any one of claims 1 to 4, a structural vertical member to which the connecting cross member is connected, and a concrete portion placed around the structural vertical member. further includes a strip reinforcement cage arranged inside the structural longitudinal member for shear reinforcement is characterized by this.

[0013] According to the concrete structure of the present invention, since the connecting cross member of the panel-type embedded formwork serves as the structural cross member of the concrete structure, the cross member can be effectively utilized and the number of constituent members can be reduced. Therefore, the construction labor and construction costs of the framework of the concrete structure can be reduced.Furthermore, the strength of the concrete structure can be increased.

[0015] A third invention for solving the above problems is to attach a plurality of projecting members projecting from the formwork members to a plurality of formwork members left as a part of the structure, and to span a connecting cross member between adjacent projecting members to join adjacent formwork members to form a panel-type embedded formwork, a step of installing a structural member embedded in a concrete structure, a step of installing the panel-type embedded formwork by suspending the panel-type embedded formwork and installing it on the side of the structural member, a step of fixing the panel-type embedded formwork by fixing the connecting cross member to the structural member as a structural cross member, and a step of placing concrete along the formwork member. In the structural member installation step, the structural longitudinal member is installed and a strip reinforcement cage is installed inside it, and further includes a scaffold installation step of installing a temporary work scaffold on the strip reinforcement cage. It is a construction method of a concrete structure characterized by the above.

[0016] According to the construction method of the concrete structure of the present invention, since the connecting cross member of the panel-type embedded formwork is used as the structural cross member of the concrete structure, the work of installing the cross member in the structural member installation step can be reduced. Since the cross member serves as a joining material for joining the formwork members and as a structural cross member of the concrete structure, the cross member can be effectively utilized and the number of constituent members can be reduced. Therefore, the construction labor and construction cost of constructing the concrete structure can be reduced. Furthermore, the installation of the work scaffold becomes easier.

Effect of the Invention

[0018] According to the panel-type embedded formwork, the concrete structure, and the construction method thereof of the present invention, the number of constituent members can be reduced, and the construction labor and construction cost can be reduced.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0020] <First Embodiment> Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the first embodiment, a case of constructing a pier with H-shaped steel as the main reinforcement as a concrete structure will be described. First, the configuration of the panel-type embedded formwork according to the first embodiment will be described.

[0021] As shown in FIG. 1, the panel-type embedded formwork 1 of the present embodiment is arranged so as to surround the main reinforcement (structural vertical member) 2 that constitutes the structural member erected in the concrete structure. The main reinforcement 2 is made of H-shaped steel that is difficult to buckle under compression, and is exposed to the foundation and joined to the column footing with the total axial force strength. A plurality of main reinforcements 2 are erected at predetermined intervals along the outer peripheral edge of the pier. As also shown in FIG. 2, the panel-type embedded formwork 1 includes a plurality of formwork members 10, a projecting member 30, and a connecting cross member 50.

[0022] The formwork member 10 is prefabricated as a non-structural member formwork that remains as a part of the structure (pier), and serves as the surface material of the pier. The formwork member 10 is composed of a rectangular precast concrete plate. Reinforcing bars (not shown) are embedded inside the formwork member 10. A plurality of formwork members 10 are connected in series vertically, horizontally, and are joined by joining fittings. The size of the panel body composed of a plurality of formwork members 10 is set to be transportable (width: 2.5 m, height: dimensions obtained by subtracting the loading platform height from 3.8 m) or less. The height of the panel body is set to be less than or equal to the depth where concrete can be placed in the formwork member 10.

[0023] The joint fitting is a steel auxiliary plate provided at the joint portion of the formwork member 10 to assist in joining the formwork members 10 joined by the connecting cross member 50. The joint fitting is laid on the joint portion of the formwork member 10. The joint fitting has a strength capable of fixing the formwork members 10 to each other and a strength capable of withstanding the pressure of the concrete applied during concrete placement. The steel plate has a thickness that can ensure the covering dimension of the connecting cross member 50. The joint fitting is classified into a first joint fitting 11 that joins four formwork members 10 adjacent to each other vertically and horizontally, a second joint fitting 12 that joins two formwork members 10 adjacent to each other in the left-right direction, and a third joint fitting 13 that joins two formwork members 10 adjacent to each other in the up-down direction according to the shape of the steel plate.

[0024] As shown in FIGS. 2 and 3, the first joint fitting 11 is composed of a rectangular steel plate and is arranged so as to abut against the corner portions of the four formwork members 10 adjacent to each other vertically and horizontally. Bolt insertion holes 14 (see FIG. 3) through which bolts B for fixing the steel plate to the formwork member 10 are inserted are formed at the four corners of the first joint fitting 11, respectively. Nuts 15 (see FIG. 3) are embedded in the formwork members 10 at positions where the bolt insertion holes 14 face each other. By screwing the shaft portion of the bolt inserted through the bolt insertion hole 14 into the nut 15, the steel plate is fixed to the formwork member 10, and the formwork members 10 adjacent to each other vertically and horizontally are joined.

[0025] In addition, a joint material 29 is provided between the adjacent formwork members 10. The joint material 29 is made of a sheet-like foam material with a width of 20 mm and a thickness of 2 mm, and an adhesive is applied to one side of the foam material. The joint material 29 is adhered to the butting portion of the formwork member 10 by the adhesive. The joint material 29 is sandwiched and compressed by the formwork members 10 in a state where the formwork members 10 are joined.

[0026] The second connecting fitting 12 is composed of a horizontally long rectangular steel plate, and is arranged so as to abut against the mutually butting side edges of two adjacent formwork members 10 on the left and right respectively. The second connecting fitting 12 is arranged at the lower end of the panel - type embedded formwork 1. Bolt insertion holes 14 (see FIG. 3) through which bolts B are inserted are respectively formed at both ends of the second connecting fitting 12. At the base end of the shaft portion of the bolt Bb provided at the lower end of the panel - type embedded formwork 1, a large - diameter portion 20 is formed which is larger in diameter than the screw portion on the tip side, and the head of the bolt Bb is fixed at a predetermined interval (axial length of the large - diameter portion 20) away from the second connecting fitting 12 (see FIG. 4). By screwing the tip end portion (screw portion) of the shaft portion of the bolt Bb inserted through the bolt insertion hole 14 into the nut 15 of the formwork member 10, the steel plate is fixed to the formwork member 10, and the formwork members 10 adjacent to each other on the left and right are joined together.

[0027] The third connecting fitting 13 is composed of a vertically long rectangular steel plate, and is arranged so as to abut against the mutually butting upper and lower edges of two adjacent formwork members 10 above and below respectively. The side view of the third connecting fitting 13 is equivalent to the side view of the first connecting fitting 11 shown in FIG. 3. Bolt insertion holes 14 through which bolts B are inserted are respectively formed at both the upper and lower ends of the third connecting fitting 13. By screwing the shaft portion of the bolt inserted through the bolt insertion hole 14 into the nut 15 of the formwork member 10, the steel plate is fixed to the formwork member 10, and the formwork members 10 adjacent to each other above and below are joined together.

[0028] As shown in FIG. 2, locking fittings for locking the panel - type embedded formwork 1 adjacent above are provided at the upper edge of the panel - type embedded formwork 1. The locking fittings include first locking fittings 16 located at both the left and right ends of the panel - type embedded formwork 1, and second locking fittings 17 located at the joining portions with the formwork members 10, 10 in the middle portion in the left - right direction.

[0029] The first locking fitting 16 is fixed to a single formwork member 10 via one bolt B. As also shown in FIGS. 4 and 5, the first locking fitting 16 includes a fixing plate portion 18 fixed to the lower formwork member 10 and a locking portion 19 formed above the fixing plate portion 18. The fixing plate portion 18 is formed of a vertically long rectangular steel plate having a horizontal width dimension equivalent to that of the third joining fitting 13 and is in contact with the surface of the formwork member 10. A bolt insertion hole 14 through which the bolt B is inserted is formed in the lower portion of the fixing plate portion 18. The fixing plate portion 18 is fixed to the formwork member 10 by screwing the shaft portion of the bolt inserted through the bolt insertion hole 14 into the nut 15 of the formwork member 10.

[0030] The locking portion 19 is a part for locking the bolt Bb provided at the lower end of the upper formwork member 10. The head of the bolt Bb is fixed at a predetermined interval (axial length of the cylindrical member 20) from the second fitting 12 (see Fig. 4). The locking portion 19 is continuous with the upper end of the fixing plate portion 18 and extends upward. The locking portion 19 includes a substrate portion 21 that is flush with the fixing plate portion 18 and a stepped plate portion 22 that is offset to the side away from the formwork member 10. The stepped plate portion 22 includes an inclined portion continuous with the substrate portion 21 and a parallel portion continuous with the tip of the inclined portion. The parallel portion is a part that presses and locks the head of the bolt Bb from the shaft portion side and is offset from the substrate portion 21 by the axial length of the cylindrical member 20. A recess 23 that is recessed downward is formed at the upper end of the parallel portion, and the upper end of the parallel portion is bifurcated upward. The recess 23 is formed at the middle portion in the left - right direction in a front view. The base end portion of the shaft portion of the bolt Bb provided on the upper formwork member 10 and the cylindrical member 20 are inserted into the recess 23 from above. A guide piece 24 is attached to the upper end portion (tip portion) of the locking portion 19. The guide piece 24 guides the bolt Bb to a predetermined position when the upper panel - type embedded formwork 1 is suspended and installed. A pair of guide pieces 24 are provided so as to sandwich the recess 23. The guide piece 24 is inclined outward (towards the formwork member 10 side) from the upper end of the locking portion 19. When the upper panel - type embedded formwork 1 is suspended, the inclined guiding portion at the upper end of the guide piece 24 enters the gap between the head of the bolt Bb and the second fitting 12 (the gap between the bolt head and the formwork member 10). When the upper panel - type embedded formwork 1 is further suspended, the head of the bolt Bb moves obliquely along the inclined guiding portion, and the upper panel - type embedded formwork 1 is guided directly above the lower panel - type embedded formwork 1 (installation position).

[0031] The second locking fitting 17 is provided so as to span across the two formwork members 10, and is fixed to each formwork member 10 via bolts B respectively. The second locking fitting 17 includes a fixing plate portion 25 fixed to the two formwork members 10, and a locking portion 26 formed above the fixing plate portion 25. The fixing plate portion 25 is made of a rectangular steel plate having the same left - right width dimension as the first joining fitting 11, and is in contact across the surfaces of the two formwork members 10. At the lower end portion of the fixing plate portion 25, two bolt insertion holes 14 through which the bolts B are inserted are formed. The fixing plate portion 18 is fixed to the formwork member 10 by screwing the shaft portion of the bolt inserted through the bolt insertion hole 14 into the nut 15 of the formwork member 10. The fixing plate portion 25 also serves to join adjacent formwork members 10.

[0032] The locking portion 26 is a portion for locking the bolt Bb provided at the lower end portion of the upper formwork member 10, and is provided at two locations in the upper part of the fixing plate portion 25. The locking portion 26 is continuously formed at the upper ends of the left and right both ends of the fixing plate portion 25 and extends upward. The locking portion 26 has the same shape as the locking portion 19. The locking portion 26 includes a substrate portion 21 and a step plate portion 22 having the same shape as the locking portion 19. A guide piece 24 is also provided at the upper end portion of the locking portion 26. For the configurations of the substrate portion 21, the step plate portion 22, and the guide piece 24, the same reference numerals are given and the description is omitted.

[0033] The protruding member 30 is a part that protrudes from the formwork member 10 and supports the formwork member 10 in a state where the panel - type embedded formwork 1 is installed. The protruding member 30 is composed of a steel material such as a round bar and is welded to the entire circumference of the joint fitting or the locking fitting. A plurality of protruding members 30 are provided and are respectively fixed to the joint fittings (excluding the joint fitting located at the lower end of the panel - type embedded formwork 1) or the locking fittings. The protruding member 30 protrudes along a direction orthogonal to the formwork member 10 toward the main reinforcement 2 side to which it is attached. The protruding member 30 is provided for fixing the connecting cross - member 50, and the connecting cross - member 50 is attached to the tip. The protruding member 30 has a length that can ensure the overlapping dimension of the connecting cross - member 50 with respect to the joint fitting or the locking fitting. The protruding member 30 has a strength to support the formwork member 10 so that it can be used as a formwork. Some of the protruding members 30 (a pair of protruding members 30 at symmetric positions on the left and right) have a strength to support the entire panel - type embedded formwork 1 because the wire W is locked when the panel - type embedded formwork 1 is suspended.

[0034] The connecting cross - member 50 is a cross - member that connects adjacent formwork members 10 and is horizontally spanned between adjacent protruding members 30. The connecting cross - member 50 is composed of reinforcing bars and is welded to the tip of the protruding member 30. In addition to the role of connecting the formwork members 10, the connecting cross - member 50 also serves as a structural cross - member of the constructed concrete structure and constitutes a part of the structural reinforcing bars of the concrete structure. Specifically, the connecting cross - member 50 is arranged so as to surround the main reinforcement 2, prevents the protrusion of the main reinforcement 2, and serves as a hoop bar (stirrup bar) for shear reinforcement of the concrete structure. The connecting cross - member 50 has a strength to fix the formwork members 10 to each other, a strength to support the formwork members 10 as a formwork, and a strength required as a stirrup bar.

[0035] As shown in (c) of FIGS. 1 and 7, the connecting horizontal member 50 is fixed to the main reinforcement 2 by the stirrup fixing fitting 51 attached to the side surface of the main reinforcement 2. The stirrup fixing fitting 51 is made of a round bar steel material with a folded-back portion 52 formed at the tip. A male screw portion is formed at the base end portion of the stirrup fixing fitting 51. The base end portion of the stirrup fixing fitting 51 is inserted into the insertion hole of the bracket 53 provided on the main reinforcement 2 and fixed to the bracket 53 by screwing the nut 54. The connecting horizontal member 50 is locked to the folded-back portion 52 and is fixed. When installing a plurality of panel - type embedded formworks 1 horizontally in the same plane with a long width dimension on the surface of a pier like the Takahashi pier, as shown in (d) of FIG. 3, at the ends of adjacent panel - type embedded formworks 1, the overlapping joint bar 55 is laid across the adjacent cantilever members 30. The overlapping joint bar 55 is fixed to the cantilever member 30 and the connecting horizontal member 50 with wire.

[0036] The concrete structure (pier) constructed using the panel - type embedded formwork 1 with the above - described configuration includes, as shown in FIG. 1, the panel - type embedded formwork 1, the structural vertical member (main reinforcement 2) to which the connecting horizontal member 50 is connected, and the concrete portion 4 (see (b) of FIG. 10).

[0037] The panel - type embedded formwork 1 is provided on each of the four sides of the pier with a rectangular cross - section. At the corner portions of the four corners of the pier, the ends of the panel bodies composed of a plurality of formwork members 10 are arranged with a gap therebetween. The corner gaps are blocked by corner members 60.

[0038] As shown in FIG. 6, the corner member 60 includes a formwork corner member 61, a fixing fitting 62, and a connecting member 63. The formwork corner member 61 is a member exposed on the outer peripheral surface of the concrete structure and is formed of precast concrete. The formwork corner member 61 has an outer surface flush with the outer surface of the formwork member 10. Both end portions in the width direction of the formwork corner member 61 are formed in directions perpendicular to each other, and the joint material 29 is attached to the end surfaces. The intermediate portion that forms the corner of the formwork corner member 61 is chamfered and inclined. Nuts 64 are embedded in the inner surface of the formwork corner member 61. The nuts 64 are provided at a height close to the cantilever member 30 of the panel - type embedded formwork 1.

[0039] The fixing fitting 62 is a member for fixing the connecting member 63 to the panel - type embedded formwork 1, and is fixed to the cantilever member 30 of the panel - type embedded formwork 1 that connects to the corner. The fixing fitting 62 is composed of, for example, a steel plate material and is arranged at the height positions of the cantilever member 30 and the connecting horizontal member 50. Recesses 62a (see (b) of FIG. 6) through which the connecting horizontal members 50 pass are respectively formed at both lateral end portions of the fixing fitting 62, and are spanned between adjacent connecting horizontal members 50. The tip portions of adjacent cantilever members 30 are welded in a state of abutting against the outer surface of the fixing fitting 62 (see (a) of FIG. 6). The fixing fitting 62 is inclined with respect to the extending direction of the cantilever member 30 and the extending direction of the connecting horizontal member 50, respectively, and is arranged parallel to the inclined surface of the formwork corner member 61. A bolt insertion hole is formed in the intermediate portion in the width direction of the fixing fitting 62 at the rising portion of the angle member.

[0040] The connecting member 63 is a member for connecting the formwork corner member 61 to the fixing fitting 62 and is composed of bolts. By inserting the connecting member 63 from the fixing fitting 62 side into the bolt insertion hole toward the formwork corner member 61 and screwing the male thread portion formed at the tip of the shaft portion of the bolt into the nut 64 of the formwork corner member 61, the formwork corner member 61 is connected to the fixing fitting 62. Thereby, the corner member 60 is fixed to the panel - type embedded formwork 1. On the tip of the adjacent cantilever member 30, a lap joint reinforcing bar 65 is installed. The lap joint reinforcing bar 65 has an arc shape curved at 90 degrees and is disposed on the fixing fitting 62. The lap joint reinforcing bar 65 is fixed to the tip of the cantilever member 30 and the end of the connecting cross member 50 with wire. The end of the lap joint reinforcing bar 65 extends along the connecting cross member 50 above the connecting cross member 50.

[0041] On the other hand, in the present embodiment, as shown in FIG. 1, a stirrup cage 3 is provided in the space inside the main reinforcement bars 2 arranged on the outer peripheral edge of the pier. It is a pre-assembled cage-shaped structure made of main reinforcement bars, stirrups, reinforcing rings, spacers, etc. The stirrup cage 3 is provided as part of the structural reinforcement of the concrete structure to be constructed. That is, the main reinforcement bars 2, the stirrup cage 3, and the connecting cross member 50 mainly constitute the structural reinforcement of the concrete structure. The stirrup cage 3 performs shear reinforcement of the concrete structure.

[0042] The concrete part 4 is formed by placing concrete around the structural reinforcement including the main reinforcement bars 2 (see FIG. 10). The concrete is placed in the inner space surrounded by the formwork member 10, and the concrete part 4 is formed in a state surrounded by the formwork member 10.

[0043] Next, the construction method of the concrete structure will be described with reference to FIGS. 7 to 10. The construction method of the concrete structure of the present embodiment includes a panel-type embedded formwork forming step, a foundation forming step, a structural member installation step, a panel-type embedded formwork installation step, a scaffolding installation step, a panel-type embedded formwork fixing step, and a concrete placing step.

[0044] The panel - type embedded formwork forming process is a process of pre - forming the panel - type embedded formwork 1 in a factory or the like. In the panel - type embedded formwork forming process, the overhanging member 30 is attached to the formwork member 10, and the connecting cross - member 50 is spanned between adjacent overhanging members 30 to join adjacent formwork members 10 together. Specifically, a plurality of formwork members 10 are joined using the welding fittings and locking fittings to which the overhanging member 30 is attached in advance to form a panel body. Then, the connecting cross - member 50 is fixed to the tip of the overhanging member 30, and adjacent formwork members 10 are joined via the connecting cross - member 50. The integrally manufactured panel - type embedded formwork 1 is transported from the factory to the construction site.

[0045] The foundation forming process is a process of forming the foundation 80 of the pier. In the foundation forming process, as shown in Fig. 7(a), fixing anchor bolts 81 are provided at the foundation 80 at the installation position of the main reinforcement 2 on the outer peripheral edge of the pier, and locking portions 82 are provided at the installation position of the panel - type embedded formwork 1. The locking portion 82 is attached after the installation of the main reinforcement 2. The locking portion 82 has the same shape as the locking portion 19 at the upper part of the first locking fitting 16 and includes a substrate portion and a stepped plate portion. The locking portion 82 rises from the foundation 80. A guide piece 83 having the same shape as the guide piece 24 is attached to the upper end portion (tip) of the locking portion 82.

[0046] The structural member installation process is a process of installing the structural members embedded in the concrete structure. In the structural member installation process, first, as shown in Fig. 7(a), the main reinforcement 2 is constructed. The main reinforcement 2 is fixed to the fixing anchor bolts 81 of the foundation 80 with double nuts 84. After the main reinforcement 2 is erected, a head - connecting jig 85 is attached at a height of 2 m from the lower end or the joint portion of the main reinforcement 2 to correct the alignment and spacing of the main reinforcement 2. Note that the stirrup cage 3, which is a part of the structural member, is installed later.

[0047] The panel - type embedded formwork installation process is a process of installing the panel - type embedded formwork 1 on the side of the structural member (main reinforcement 2). In the panel - type embedded formwork installation process, first, mortar is laid on the surface of the foundation 80 at the installation position to adjust the lower - end level, and then the layout is marked. The locking part 82 is fixed to the foundation 80 with driving anchors. Then, a sealing tape is attached, and as shown in Fig. 7(b), it is hung on a pair of overhanging members 30 in the second row from the bottom, suspended by a crane via a wire W, and moved near the installation position. An operator guides the panel - type embedded formwork 1 from near the inside above the installation position, and makes the upper - end part of the guide piece 83 enter between the head of the bolt Bb at the lower - end part of the panel - type embedded formwork 1 and the second joining fitting 12 (in the case of the bolts Bb at both the left and right ends, between the head of the bolt Bb and the surface of the formwork member 10). Then, as the head of the bolt Bb moves along the inclined part of the guide piece 83, the upper - side panel - type embedded formwork 1 is automatically guided to the installation position on the foundation 80. And the formwork member 10 is placed on the sealing tape laid on the foundation 80, and the sealing tape is compressed (see Fig. 7(c)).

[0048] The panel - type embedded formwork fixing process is a process of fixing the connecting horizontal member 50 as a structural horizontal member (hoop reinforcement) to the structural member (main reinforcement 2) of the concrete structure (bridge pier). In the panel - type embedded formwork fixing process, as shown in Fig. 7(c), the connecting horizontal member 50 of the panel - type embedded formwork 1 is locked by the folded - back part 52 at the tip of the strip - reinforcement fixing fitting 51, and the base - end part of the strip - reinforcement fixing fitting 51 is inserted into the insertion hole of the bracket 53 provided on the main reinforcement 2, and the nut 54 is screwed. As a result, the connecting horizontal member 50 is pulled toward the main - reinforcement 2 side and fixed to the main reinforcement 2 in a state of being in close contact with the main reinforcement 2. Note that the screwing of the nut 54 is performed by the operator from the inside. The connecting horizontal members 50 are fixed so as to surround the outer periphery of the plurality of arranged main reinforcements 2 and serve as hoop reinforcements.

[0049] When the fixation of the panel - type embedded formwork 1 is completed, remove the stay ropes and release the crane. When installing a plurality of panel - type embedded formworks 1 horizontally on the surface of a pier with a long width dimension like the Takahashi pier, lay sealing tape on the side surface of the formwork member 10 and install and fix them adjacent to each other in the same way. Then, lay the overlapping joint reinforcing bars across the adjacent overhanging members 30 of the adjacent panel - type embedded formworks 1 and fix the overlapping joint reinforcing bars to the connecting horizontal member 50 with wire.

[0050] At the corner of the pier, fix the corner member 60 from the inside (see Fig. 1). Specifically, hang the fixing fitting 62 across the tip of the connecting horizontal member 50, insert the connecting member 63 through the fixing fitting 62. Then, by screwing the male thread part at the tip of the shaft part of the bolt into the nut 64 of the formwork corner member 61, pull the formwork corner member 61 and fix it. As a result, the corner member 60 is fixed to the panel - type embedded formwork 1. Hang an arc - shaped overlapping joint reinforcing bar 65 (see Fig. 6) across the tips of the overhanging members 30 adjacent in the orthogonal direction and fix it with wire. In Fig. 6(a), the overlapping joint reinforcing bar 65 is shown by a virtual line for easy viewing of the lower member.

[0051] After that, as shown in Fig. 8(a), as a structural member installation process, install the stirrup cage 3 inside the main reinforcement 2. The stirrup cage 3 is installed by hanging it with stay ropes and suspending it from the crane. The stirrup cage 3 is installed at a position about 50 mm away from the main reinforcement 2 under the guidance of the operator. This makes it difficult for the stirrup cage 3 guided by the operator to collide with the main reinforcement 2. The lowermost stirrup cage 3 is installed on the pedestal on the foundation 80. When the fixation of the stirrup cage 3 is completed, remove the stay ropes and release the crane.

[0052] After installing the stirrup cage 3, as shown in Fig. 8(b), install a temporary working scaffold 5 on the stirrup cage 3 (scaffold installation process). The working scaffold 5 is a mesh - shaped wire mesh scaffold and is hung across the rib reinforcements at the upper end of the stirrup cage 3. When the height of the working scaffold 5 is 2 m or more from the ground, install a fall - prevention handrail (not shown) along the working scaffold 5 on the main reinforcement 2. Since the working scaffold 5 is installed on the stirrup cage 3 in this way, the installation of the working scaffold 3 can be easily carried out.

[0053] The concrete placing process is a process of placing concrete along the formwork member 10. In the concrete placing process, as shown in Fig. 9(a), the concrete is placed to a height where the working scaffold 5 is not buried using a concrete pump truck or a bucket. Then, after appropriately compacting the placed concrete with a vibrator, it is cured. As a result, the main reinforcement bars 2, the structural horizontal members (connecting horizontal members 50), and the stirrup cages 3 are embedded in the concrete to form a concrete structure.

[0054] After that, after the curing of the concrete, the head connecting jig 85 attached to the main reinforcement bars 2 is removed and replaced 2 m above the working scaffold 5. Then, as shown in Figs. 9(b) and (c), the installation (panel - type embedded formwork installation process) and fixation (panel - type embedded formwork fixation process) of the second - stage panel - type embedded formwork 1 are carried out. In the second - stage panel - type embedded formwork installation process, the panel - type embedded formwork 1 is hooked and suspended by a crane and lowered to the installation position (above the lower - stage panel - type embedded formwork 1). An operator rides on the working scaffold 5 installed on the stirrup cage 3 and guides the panel - type embedded formwork 1. When the operator lowers the upper - stage panel - type embedded formwork 1 to the installation position, the upper end of the guide piece 24 of the lower - stage panel - type embedded formwork 1 enters between the head of the bolt Bb at the lower end of the upper - stage panel - type embedded formwork 1 and the second joining fitting 12 (in the case of the bolts Bb at both the left and right ends, between the head of the bolt Bb and the surface of the formwork member 10). Further, as the head of the bolt Bb moves along the inclined portion of the guide piece 24, the upper - stage panel - type embedded formwork 1 is guided and placed directly above the lower - stage panel - type embedded formwork 1 (see Fig. 9(c)).

[0055] The second - stage panel - type embedded formwork fixation process is the same as the first - stage panel - type embedded formwork fixation process, so the description is omitted. At the corner of the pier, the second - stage corner member 60 is fixed from the inside. After all the panel - type embedded formworks 1 are installed, the anti - fall handrail is removed.

[0056] After that, as shown in FIGS. 10(a) and 10(b), as a structural member installation step, the second-tier stirrup cage 3 is installed inside the main reinforcement bars 2. First, the work platform 5 on the first-tier stirrup cage 3 is removed. In the installation step of the second-tier stirrup cage 3, hooks (formed by welding two steel bars in a forked shape) protruding from the lower end of the second-tier stirrup cage 3 are fitted onto the ribbed bars at the upper end of the first-tier stirrup cage 3. After installing the stirrup cage 3, a work platform (not shown) is installed on the stirrup cage 3, and above it, a fall prevention handrail (not shown) is installed on the main reinforcement bars 2.

[0057] Next, the second-tier concrete pouring step is performed. The concrete pouring step is the same as the first-tier concrete pouring step. By repeating each of the above steps according to the height of the pier, a concrete structure is constructed.

[0058] According to the panel-type embedded formwork 1, the concrete structure, and the method for constructing the concrete structure according to the present embodiment, adjacent formwork members 10 of the panel-type embedded formwork 1 are connected via the structural cross members of the concrete structure. That is, since the connecting cross member 50 of the panel-type embedded formwork 1 is also used as the structural cross member of the concrete structure, the cross member can be effectively utilized and the number of components can be reduced. Therefore, the construction labor and construction costs can be reduced. Further, if the panel-type embedded formwork 1 is installed, the connecting cross member 50 is arranged at a predetermined position as the structural cross member, so the labor for separately installing the structural cross member is omitted.

[0059] Since the connecting cross member 50 is a hoop bar surrounding the main reinforcement bars 2, it can suppress the protrusion of the main reinforcement bars 2 and form a structural member of the concrete structure with shear reinforcement.

[0060] Furthermore, at the joint portion of the formwork members 10 of the panel-type embedded formwork 1, the first to third joint members 11 to 13 or the second locking metal fittings 17 are laid as auxiliary plates for assisting the joint between the formwork members 10, so that the formwork members 10 can be firmly joined together.

[0061] <Second Embodiment> Next, a second embodiment for implementing the present invention will be described in detail with reference to FIGS. 11 to 14. In the second embodiment, the case of constructing a rising portion 103 erected on a strip foundation 102 in a house or the like as a concrete structure will be described. First, the configuration of the panel-type embedded formwork according to the second embodiment will be described.

[0062] As shown in FIG. 14, the panel-type embedded formwork 101 of the present embodiment is arranged along the rising portion 103. The rising portion 103 is erected on the base portion 104. Inside the rising portion 103 and the base portion 104, a base bar 105, end bars 106, rib bars 107, lower steel bars 108, and upper steel bars 109 are embedded. These steel bars 104 to 109 are integrated by welding in advance and form prefabricated steel bars. The base bar 105 extends in the width direction of the base portion 104, and a plurality of them are arranged at predetermined intervals in the longitudinal direction of the base portion 104. The end bars 106 extend along the longitudinal direction of the base portion 104 and are respectively joined to both ends of the base bar 105. The rib bars 107 are joined to the middle portion of the base bar 105 and rise upward. The lower steel bar 108 extends along the longitudinal direction of the base portion 104 and is joined to the lower end portion of the rib bar 107. The lower steel bar 108 has the strength required as a lower main bar with a single steel bar. The upper steel bar 109 extends along the longitudinal direction of the base portion 104 and is joined to the upper end portion of the rib bar 107. The upper steel bar 109, together with a connecting cross member 150 to be described later, has the strength required as an upper main bar.

[0063] As shown in FIG. 11, the panel-type embedded formwork 101 includes a plurality of formwork members 110, overhanging members 130, and connecting cross members 150. The formwork member 110 is prefabricated as a non-structural member embedded formwork that remains as part of the structure (bridge pier), and serves as the surface material on the outer side of the rising portion 103. The formwork member 110 is composed of a rectangular precast concrete plate. Reinforcing bars (not shown) are embedded inside the formwork member 110. A plurality of formwork members 110 are connected in series on the left and right and joined by joining fittings. The panel body composed of a plurality of formwork members 110 has a horizontally long shape. The size of the panel body preferably has a height dimension equivalent to the rising dimension of the rising portion 103 and a length dimension of about 6 m or less as a transportable weight and length. With such a size, the panel body can be manually transported on a narrow site.

[0064] The joining fitting is a steel auxiliary plate for assisting the joining of formwork members 110 joined by the connecting cross member 150. The joining fitting is laid at the joining portion of the formwork member 110. The joining fitting has a strength capable of fixing the formwork members 110 to each other and a strength capable of withstanding the pressure of the concrete applied during concrete placement. The steel plate has a thickness capable of ensuring the covering dimension of the connecting cross member 150. The joining fitting is classified into an upper joining fitting 111 that joins the upper end portion of the formwork member 110 and a lower joining fitting 112 that joins the lower end portion of the formwork member 110.

[0065] The upper joint fitting 111 is composed of a horizontally long rectangular steel plate and is arranged to abut against the abutting side edges of two adjacent formwork members 110 on the left and right respectively. The upper joint fitting 111 is arranged at the upper end of the panel - type embedded formwork 101. Bolt insertion holes (not shown) through which bolts B are inserted are respectively formed at both ends of the upper joint fitting 111. By screwing the shaft portion of the bolt B inserted through the bolt insertion hole into the nut 115 embedded in the formwork member 110, the steel plate is fixed to each formwork member 110, and the adjacent formwork members 110 on the left and right are joined. Above the middle part between adjacent bolt insertion holes, an extension member 130 is fixed at the position where it engages with the upper reinforcing bar 109. Note that the upper joint fitting 111a located at both left and right ends of the panel - type embedded formwork 101 has only one bolt insertion hole and is formed with a small width.

[0066] The lower joint fitting 112 is composed of a rectangular steel plate and is arranged to abut against the abutting side edges of two adjacent formwork members 110 on the left and right respectively. The lower joint fitting 112 is arranged at the lower end of the panel - type embedded formwork 101. Bolt insertion holes (not shown) through which bolts B are inserted are respectively formed at both lower ends of the lower joint fitting 112. By screwing the shaft portion of the bolt B inserted through the bolt insertion hole into the nut 115 embedded in the formwork member 110, the steel plate is fixed to each formwork member 110, and the adjacent formwork members 110 on the left and right are joined. The lower joint fitting 112 extends upward by a predetermined length from the position of the bolt insertion hole, and the middle part of the extended upper end is the position where the extension member 130 is fixed. That is, the lower joint fitting 112 joins the lower ends of the formwork members 10 and supports the extension member 30 at a position a predetermined length higher from the lower end. Note that the upper joint fitting 112a located at both left and right ends of the panel - type embedded formwork 101 has only one bolt insertion hole and is formed with a small width and vertically long.

[0067] The protruding member 130 is a part that protrudes from the formwork member 110 and supports the formwork member 110 in a state where the panel-type embedded formwork 101 is installed. The protruding member 130 is composed of a steel material such as a round bar, and a plurality of them are provided. The protruding member 130 is welded to the entire circumference of the surfaces of the upper connecting fittings 111, 111a and the lower connecting fittings 112, 112a respectively. The protruding member 130 protrudes along a direction perpendicular to the formwork member 110 toward the side of the rib 107 to which it is attached. The protruding member 130 is provided for attaching the connecting cross member 150, and the connecting cross member 150 is attached to the middle part. Further, the protruding member 130 also serves as a separator that supports the formwork 117 facing the formwork member 110, and the formwork 117 facing the formwork member 110 is attached to the tip. The formwork 117 is a normal formwork and is removed after the concrete is placed. The protruding member 130 has a strength to support the formwork member 110 and the formwork 117 so that they can be used as formworks. In some of the protruding members 130 (a pair of protruding members 130 at symmetric positions among the upper protruding members 130), when the panel-type embedded formwork 101 is suspended, the wire W (see FIG. 12) is locked, so it has a strength capable of supporting the entire panel-type embedded formwork 101.

[0068] The connecting cross member 150 is a cross member that connects adjacent formwork members 110 and is horizontally spanned between adjacent cantilever members 130. The connecting cross member 150 is composed of reinforcing bars and is welded to the substantially middle part of the cantilever member 130. Specifically, the connecting cross member 150 is welded to the cantilever member 130 at a position where the overlapping dimension of the connecting cross member 150 can be ensured with respect to the welding fitting and the formwork 117. In addition to the role of connecting the formwork members 10 to each other, the connecting cross member 150 also serves as a structural cross member of the concrete structure (the rising part 103) to be constructed and also serves as a part of the structural reinforcing bars of the concrete structure. Specifically, the connecting cross member 150 fixed to the upper cantilever member 130 is fixed to the upper end portion of the rib 107 which is a structural longitudinal member and has the strength required as the upper main reinforcement in combination with the upper reinforcing bar 109. That is, the upper connecting cross member 150 constitutes a part of the upper main reinforcement (structural cross member) which is the structural reinforcing bar of the concrete structure. The connecting cross member 150 fixed to the lower cantilever member 130, when the height dimension of the rising part 103 is large, in addition to the role of connecting adjacent formwork members 110 to each other, is fixed to the middle part in the height direction of the rib 107 and serves as a web reinforcement.

[0069] The concrete structure (the rising part 103 of the mat foundation) constructed using the panel - type embedded formwork 101 of the above - described configuration includes, as shown in Fig. 14(b), the panel - type embedded formwork 1, the structural longitudinal member (rib 107) to which the connecting cross member 150 is connected, and the concrete part 120 (see Fig. 10(b)).

[0070] The panel - type embedded formwork 101 is provided on one side (outer surface) of the rising part 103, and the formwork member 10 is exposed to the outside. The concrete part 120 is formed by placing concrete around the structural reinforcing bars including the rib 107 and the connecting cross member 150. Since the inner surface of the rising part 103 is partitioned by a normal formwork 117, after removing the formwork 117, the concrete part 120 is exposed.

[0071] Next, a method for constructing a concrete structure will be described with reference to FIGS. 12 to 14. The method for constructing the concrete structure of this embodiment includes a panel-type embedded formwork forming step, a foundation forming step, a structural member installation step, a panel-type embedded formwork installation step, a panel-type embedded formwork fixing step, and a concrete placing step.

[0072] The panel-type embedded formwork forming step is a step of pre-forming the panel-type embedded formwork 101 at a factory or the like. In the panel-type embedded formwork forming step, the overhanging member 130 is attached to the formwork member 110, and the connecting cross member 150 is spanned between adjacent overhanging members 130 to join adjacent formwork members 110 together. Specifically, a plurality of formwork members 110 are joined using joint fittings (upper joint fitting 111 and lower joint fitting 112) to which the overhanging member 130 is attached in advance to form a panel body. A sealing tape for preventing leakage of concrete and chipping of the formwork member 110 is sandwiched between the plurality of formwork members 110. Thereafter, the connecting cross member 150 is welded and fixed to the middle part of the overhanging member 130 to join adjacent formwork members 110 to each other via the connecting cross member 150. Then, the integrally manufactured panel-type embedded formwork 101 is transported from the factory to the construction site.

[0073] The foundation forming step is a step of forming the base portion 104 of the cloth foundation. In the foundation forming step, as shown in FIG. 12(a), the foundation ground 170 is undercut to form a groove 171 larger than the foundation width, and a ground layer 172 is formed at the bottom of the groove 171. Thereafter, a precast reinforcing bar in which the base reinforcement 105, the end reinforcement 106, the rib reinforcement 107, the lower reinforcement 108, and the upper reinforcement 109 are integrated is installed at a predetermined height on the ground layer 172. In this embodiment, this becomes the structural member installation step. Then, the base side formwork 173 is installed on both sides, and the base concrete is placed and cured. When the curing is completed, the base side formwork 173 is removed (see FIG. 12(b)). Thereby, the base portion 104 is formed.

[0074] The panel - type embedded formwork installation process is a process of installing the panel - type embedded formwork 101 on the side of the structural member (rib 107). In the panel - type embedded formwork installation process, as shown in Fig. 12(b), first, mortar 174 is laid on the surface of the base part 104 to adjust the lower - end level. Then, a layout is marked on the base part 104 to indicate the installation position. After that, the upper overhanging member 130 of the panel - type embedded formwork 101 is slung with a wire, and it is suspended by a crane or the like via the wire W and moved to the installation position (see Fig. 13(a)).

[0075] The panel - type embedded formwork fixing process is a process of fixing the connecting horizontal member 150 as a structural horizontal member to the structural member (rib 107) of the concrete structure (vertical rising part 103). In the panel - type embedded formwork fixing process, first, as shown in Fig. 13(a), the support jig 175 is spanned between the foundation ground 170 and the upper - end part of the panel - type embedded formwork 101 to vertically support the panel - type embedded formwork 1. Then, the slinging is removed and the crane is released. And at the side of the upper - side connecting horizontal member 150, the splicing bar 177 is set at the upper - end of the rib 107 and fixed with a wire. The lower - side connecting horizontal member 150 abuts against the side surface of the rib 107 and is tightly fastened with a wire (lap joint is not required).

[0076] After that, as shown in Fig. 13(b), the outer part 178 of the panel - type embedded formwork 101 is filled back, and a void 179 for piping is installed inside the lower - end part of the formwork member 110. And at the tip of the overhanging member 30, a formwork 117 such as a compane or a metal form is installed, and the nut 118 is screwed onto the male - threaded part at the tip of the overhanging member 30 to fix the formwork 117. Here, the overhanging member 30 serves as a separator that supports the formwork 117 facing the formwork member 110.

[0077] The concrete placement process is a process of placing concrete along the formwork member 110 and the formwork 117. In this embodiment, as shown in Fig. 14(a), an anchor bolt 180 is set at the upper end of the panel-type embedded formwork 101 using a dedicated jig. In the concrete placement process, the concrete is placed up to the upper end height of the formwork member 110 using a concrete pump truck (see Fig. 4(b)). Then, after appropriately tamping the placed concrete with a vibrator, the position of the anchor bolt 180 is inspected, adjusted, and cured. When the curing is completed, as shown in Fig. 14(b), the formwork 117 is removed, and the rising portion 103 is completed.

[0078] According to the panel-type embedded formwork 101, the concrete structure, and the construction method of the concrete structure according to this embodiment, similar to the first embodiment, since the connecting cross member 50 of the panel-type embedded formwork 101 is also used as the structural cross member of the concrete structure, the cross member can be effectively utilized, and the number of constituent members can be reduced. Therefore, the construction labor and construction costs can be reduced.

[0079] Since the connecting cross member 150 also serves as a separator, the opposing formwork 117 can be supported at a predetermined position, and the rising portion 102 of the foundation can be constructed with high precision.

[0080] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the foregoing embodiments, and each of the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention. For example, in the above embodiment, as a concrete structure, the rising portions of bridge piers and raft foundations are constructed, but it is not limited thereto. Using the panel-type embedded formwork of the present invention, for example, walls of reinforced concrete structures (including both load-bearing walls and non-load-bearing walls) and walls of reinforced concrete structures in basements can be constructed. When constructing a wall, the panel-type embedded formwork is stacked in the same manner as a bridge pier. When constructing a basement wall, a panel-type embedded formwork subjected to waterproof treatment is used.

Description of Reference Numerals

[0081] 1 Panel-type embedded formwork 2 Main reinforcement bars (structural members) 3 Stirrup cage 4 Concrete part 5 Working scaffold 10 Formwork member 16 First locking fitting (locking fitting) 17 Second locking fitting (locking fitting) 19 Locking part 22 Step plate part 24 Guide piece 26 Step plate part 30 Protruding member 50 Connecting cross member 101 Panel - type embedded formwork 102 Fabric foundation 103 Upright part 107 Rib reinforcement bars (structural members) 110 Formwork member 120 Concrete part 130 Protruding member 150 Connecting cross member

Claims

1. A plurality of formwork members left as part of a structure, a plurality of overhanging members protruding from the formwork members, and a connecting cross member spanned between adjacent overhanging members, The connecting cross member becomes a structural cross member of a concrete structure to be constructed, Adjacent formwork members are connected via the connecting cross member, An auxiliary plate for assisting the joining of formwork members is laid at the joining portion of adjacent formwork members, The overhanging member is provided orthogonal to the auxiliary plate A panel - type embedded formwork, characterized in that.

2. A plurality of formwork members left as part of a structure, a plurality of overhanging members protruding from the formwork members, and a connecting cross member spanned between adjacent overhanging members, The connecting cross member becomes a structural cross member of a concrete structure to be constructed, Adjacent formwork members are connected via the connecting cross member, At the upper edge portion of the formwork member, a locking fitting for locking another panel - type embedded formwork adjacent above and a guide piece for guiding the panel - type embedded formwork adjacent above directly above the panel - type embedded formwork are provided, The locking fitting includes a locking portion for locking a bolt whose head is fixed with a gap between it and a formwork member of another panel - type embedded formwork adjacent above, The locking portion includes a step plate portion that separates from the formwork member and presses and locks the head of the bolt from the shaft portion side, The guide piece is inclined outward from the upper end of the step plate portion and includes an inclined guiding portion that enters the gap between the head of the bolt and the formwork member A panel - type embedded formwork, characterized in that.

3. The connecting cross member is a hoop reinforcement surrounding a structural member erected in the concrete structure The panel - type embedded formwork according to claim 1 or claim 2, characterized in that.

4. The overhanging member is a separator that supports a formwork facing the formwork member The panel - type embedded formwork according to claim 1 or claim 2, characterized in that.

5. A panel - type embedded formwork according to any one of claims 1 to 4, a structural longitudinal member to which the connecting cross member is connected, and a concrete portion placed around the structural longitudinal member, Further comprising a stirrup cage arranged inside the structural longitudinal member for shear reinforcement A concrete structure, characterized in that.

6. A panel-type embedded formwork forming step of attaching a plurality of projecting members projecting from the formwork members to a plurality of formwork members left as a part of the structure, and joining adjacent formwork members by spanning a connecting cross-member between adjacent projecting members to form a panel-type embedded formwork; A structural member installation step of installing a structural member embedded in a concrete structure; A panel-type embedded formwork installation step of suspending the panel-type embedded formwork and installing it on the side of the structural member; A panel-type embedded formwork fixing step of fixing the connecting cross-member to the structural member as a structural cross-member; A concrete placing step of placing concrete along the formwork member, comprising: In the structural member installation step, a structural vertical member is installed and a belt reinforcement cage is installed inside thereof; Further comprising a scaffold installation step of installing a temporary work scaffold on the belt reinforcement cage A method for constructing a concrete structure, characterized in that.

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