Manufacturing method of concrete structure and concrete structure

Abstract

To provide a manufacturing method of a concrete structure by a prepacked concrete method that can easily place a coarse aggregate such as concrete rubble inside a formwork and improve the efficiency of construction.SOLUTION: A manufacturing method of a concrete structure 100 includes: a step of placing in a formwork 40 a prepacked member 10 including a storage member 20 and a coarse aggregate 30 stored in the storage member 20; a step of placing in the formwork 40 a solidification material; and a step of hardening the placed solidification material, the storage member 20 includes a holding part that holds the coarse aggregate 30 and has a plurality of openings through which the solidification material can pass.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a concrete structure and a concrete structure. [Background technology]

[0002] Conventionally, a method for producing large unreinforced concrete structures using a prepacked concrete method has been known for port or river construction, etc. In recent years, a method for producing concrete using the prepacked concrete method has also been known for the purpose of making effective use of concrete debris.

[0003] Patent Document 1 discloses a method in which injection mortar made by mixing binder and fine aggregate with seawater is injected into a formwork containing coarse aggregate made of crushed concrete debris into sizes of 200 mm to 500 mm, and then the formwork is removed after a prescribed period of time has passed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-20925 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, concrete structures such as wave-dissipating blocks may have narrow openings in the formwork through which coarse aggregate made from concrete debris can be poured. However, it is difficult to perform detailed work with machines such as backhoes, and it is difficult to directly pour the heavy aggregate made from concrete debris into the formwork using a machine. Even if the aggregate made from concrete debris can be poured into the formwork using a machine, there is a risk that the aggregate will collide with the formwork with force, causing damage such as scratches or dents to the formwork. If damage occurs to the formwork, not only will the finished shape be impaired, but there is also a risk of incurring large repair costs.

[0006] In order to minimize damage to the formwork, the aggregate needs to be poured into the formwork manually, but if the proportion of manual labor is high, it will take a long time to manufacture a concrete structure, and since the concrete debris is heavy, it may require a lot of labor.

[0007] The present invention has been made in consideration of the problems inherent in the prior art. An object of the present invention is to provide a method for manufacturing a concrete structure using a prepacked concrete method that allows coarse aggregate such as concrete rubble to be easily placed within a formwork, thereby improving the efficiency of construction, and a concrete structure. [Means for solving the problem]

[0008] A method for manufacturing a concrete structure according to a first aspect of the present invention includes the steps of placing a prepacked member including a container member and coarse aggregate contained in the container member in a formwork, casting a hardening material in the formwork, and hardening the cast hardening material. The container member includes a holding portion that holds the coarse aggregate and has a plurality of openings through which the hardening material can pass.

[0009] A concrete structure according to a second aspect of the present invention includes a container member, a prepacked member including coarse aggregate contained in the container member, and a hardened body of a solidifying material that binds the coarse aggregates together and the prepacked members together. The container member includes a holding portion that holds the coarse aggregate and has a plurality of openings. The hardened body of the solidifying material is disposed in the plurality of openings. Effect of the Invention

[0010] According to the present disclosure, it is possible to provide a manufacturing method for a concrete structure and a concrete structure using a prepacked concrete method, which allows coarse aggregate such as concrete rubble to be easily placed within a formwork, thereby improving the efficiency of construction. [Brief description of the drawings]

[0011] [Figure 1]FIG. 13 is a perspective view showing an example of a wire cage without an insertion hole. [Diagram 2] 1 is a cross-sectional view showing an example of a prepacked member in which coarse aggregate is contained in a wire cage having no insertion holes. [Diagram 3] FIG. 13 is a perspective view showing an example of a wire cage with an insertion hole. [Figure 4] 1 is a cross-sectional view showing an example of a prepacked member in which coarse aggregate is contained in a wire cage with insertion holes. FIG. [Diagram 5] FIG. 11 is a cross-sectional view showing an example of a state in which the prepacked components are accommodated in a mold. [Figure 6] FIG. 11 is a cross-sectional view showing an example of a state in which a pressure pipe is inserted into a formwork. [Figure 7] FIG. 1 is a cross-sectional view showing an example of a concrete structure according to an embodiment. [Figure 8] FIG. 13 is a perspective view showing an example of a lattice cage without an insertion hole. [Figure 9] FIG. 13 is a perspective view showing an example of a lattice cage having an insertion hole. [Figure 10] FIG. 11 is a perspective view showing an example of a mesh bag without an insertion hole. [Figure 11] FIG. 13 is a side view showing an example of a mesh bag without an insertion hole. [Figure 12] 1 is a perspective view showing an example of coarse aggregate contained in a mesh bag without insertion holes. FIG. [Figure 13] FIG. 2 is a cross-sectional view showing an example of a mesh bag without an insertion hole. [Figure 14] FIG. 13 is a perspective view showing an example of a mesh bag having an insertion hole. [Figure 15] FIG. 2 is a cross-sectional view showing an example of a mesh bag with an insertion hole. [Figure 16] FIG. 11 is a cross-sectional view showing another example of a pressure pipe inserted into a formwork. [Figure 17] FIG. 11 is a cross-sectional view showing another example of a pressure pipe inserted into a formwork. [Figure 18] FIG. 11 is a cross-sectional view showing another example of a pressure pipe inserted into a formwork. [Figure 19] FIG. 11 is a cross-sectional view showing another example of a pressure pipe inserted into a formwork. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the concrete structure manufacturing method and the concrete structure according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may differ from the actual ratios.

[0013] The method for manufacturing a concrete structure according to this embodiment includes a prepacked member preparation step, a prepacked member arrangement step, a casting step, and a hardening material hardening step. In this embodiment, an example will be described in which the concrete structure is a wave-dissipating block composed of four legs of a truncated cone.

[0014] In the prepacked member preparation step, a prepacked member 10 is prepared. By preparing the prepacked member 10 in advance, it is possible to efficiently manufacture a concrete structure by the prepacked concrete method.

[0015] The prepacked member 10 includes a storage member 20 and coarse aggregate 30 stored in the storage member 20. The storage member 20 includes a holding portion that holds the coarse aggregate 30 and has a plurality of openings through which the solidifying material can pass.

[0016] Fig. 1 is a perspective view showing an example of a wire cage 20A without insertion holes. Fig. 2 is a cross-sectional view showing an example of a prepacked member 10A in which coarse aggregate 30 is accommodated in the wire cage 20A without insertion holes. That is, this shows an example in which the accommodation member 20 is the wire cage 20A and the holding portion is mesh-shaped.

[0017] The wire cage 20A is a no-insertion-hole type wire cage 20A that does not have an insertion hole 25 through which a pressure pipe 50 for pouring a solidification material can be inserted (see FIG. 6). The wire cage 20A includes a disk-shaped bottom wall 21, an outer wall 22 extending upward from the circumference of the bottom wall 21, and a disk-shaped lid portion 23 connected to the end of the outer wall 22 on the opposite side to the bottom wall 21. The bottom wall 21, the outer wall 22, and the lid portion 23 form a holding portion that holds the coarse aggregate 30, and are formed of a mesh member. The wire cage 20A has an internal space capable of accommodating the coarse aggregate 30. The internal space is surrounded and formed by the bottom wall 21, the outer wall 22, and the lid portion 23.

[0018] The lid portion 23 of the wire cage 20A is opened, the coarse aggregate 30 is filled into the internal space, and the lid portion 23 is closed to obtain the prepacked member 10A.

[0019] 1 and 2, the prepacked member 10A using a wire cage 20A of the type without an insertion hole has been described, but the prepacked member 10 may have an insertion hole 25 into which a pressure pipe 50 for pouring a solidification material can be inserted (see FIG. 6). That is, although the wire cage 20A of the type without an insertion hole has been described in FIGS. 1 and 2, the storage member 20 may be a wire cage 20B of the type with an insertion hole having an insertion hole 25 as shown in FIGS. 3 and 4.

[0020] The wire cage 20B further includes a cylindrical inner wall 24 extending in the vertical direction inside the outer wall 22, as compared with the wire cage 20A. The bottom wall 21 has an opening 21A. Similarly, the lid portion 23 has an opening 23A. Both ends of the inner wall 24 are configured to be connected to the openings 21A and 23A, and are configured so that the pressure feed pipe 50 can be inserted inside the inner wall 24. The bottom wall 21, the outer wall 22, the lid portion 23, and the inner wall 24 form a holding portion that holds the coarse aggregate 30, and are formed of a mesh member. The wire cage 20B has an internal space capable of accommodating the coarse aggregate 30. The internal space is surrounded and formed by the bottom wall 21, the outer wall 22, the lid portion 23, and the inner wall 24.

[0021] As with the wire cage 20A, the prepacked member 10B can be obtained by opening the lid 23 of the wire cage 20B, filling the internal space with coarse aggregate 30, and closing the lid 23. The prepacked member 10B has an insertion hole 25, so that a pressure delivery pipe 50 for the solidification material can be inserted. Therefore, the pressure delivery pipe 50 can be inserted deep into the formwork 40, and the solidification material can be sufficiently permeated between the coarse aggregate 30.

[0022] The coarse aggregate 30 is not particularly limited, and may contain at least one selected from the group consisting of porous concrete, recycled aggregate, and concrete chunks. These coarse aggregates 30 can suppress heat generated when cement hardens and shrinkage of cement after solidification. The recycled aggregate may contain concrete debris. That is, the coarse aggregate 30 may contain concrete debris. By including concrete debris in the coarse aggregate 30, the amount of concrete rubble to be disposed of can be reduced, and the concrete rubble can be effectively utilized.

[0023] The coarse aggregate 30 may contain carbonated hardened concrete in which carbon dioxide is fixed. This can greatly contribute to reducing carbon dioxide gas emissions in the manufacturing process of concrete structures. The hardened concrete that has absorbed carbon dioxide gas can be produced by a known method.

[0024] The size of the coarse aggregate 30 is not particularly limited, and may be, for example, 100 mm or more and 800 mm or less. When the size of the coarse aggregate 30 is 100 mm or more, the solidification material is easily filled between the coarse aggregates 30, so that the filling density of the solidification material in the formwork 40 can be increased. When the size of the coarse aggregate 30 is 800 mm or less, the coarse aggregate 30 can be prevented from escaping from the opening of the storage member 20. When concrete rubble is used as the coarse aggregate 30, the effort required to crush the concrete rubble into small pieces can be reduced. Furthermore, when the coarse aggregate 30 includes a carbonated concrete hardened body, a large amount of the carbonated concrete hardened body can be filled in the formwork 40, so that the amount of fixed carbon dioxide can be increased. The size of the coarse aggregate 30 may be 200 mm or more, or may be 300 mm or more. The size of the coarse aggregate 30 may be 700 mm or less, 600 mm or less, or 500 mm or less.

[0025] In the prepacked member placement step, as shown in FIG. 5, the prepacked member 10 is placed in a formwork 40. The formwork 40 is a member that forms the side surface of a concrete structure, and in this embodiment, the formwork 40 is composed of four legs of a truncated cone. The formwork 40 has a space inside that can be filled with the prepacked member 10 and a hardening material, and by putting the prepacked member 10 and the hardening material in and hardening the hardening material, a concrete structure can be formed into a desired shape and dimensions. The formwork 40 can be formed by combining multiple parts, and may be formed from a metal such as steel or aluminum.

[0026] By disposing the prepacked member 10 in the formwork 40, the work efficiency can be improved compared to the case where each coarse aggregate 30 is disposed in the formwork 40. In addition, when each coarse aggregate 30 is poured into the formwork 40 using a construction machine such as a backhoe, the force of the falling coarse aggregate 30 may collide with the formwork 40 and damage the formwork 40. However, according to this method, the prepacked member 10 can be suspended and poured when assembling the formwork 40, so that the coarse aggregate 30 can be disposed in the formwork 40 in a short time. Therefore, the work can be performed in a short time without damaging the formwork 40, so that the work efficiency can be improved and labor saving can be promoted. According to the method of this embodiment, the coarse aggregate 30 is contained in the containing member 20, and the coarse aggregate 30 is unlikely to scatter. Therefore, for example, after the prepacked member 10 is placed on the base that becomes the bottom wall of the formwork 40, the side wall of the formwork 40 can be assembled to the bottom wall.

[0027] In addition, in the method according to the present embodiment, since the coarse aggregate 30 is accommodated in the accommodation member 20, the prepacked members 10 can be stacked in the height direction. This allows the manufacture of concrete structures having not only simple shapes such as cubes, but also complex shapes such as wave-dissipating blocks composed of four legs. As shown in FIG. 5, in this embodiment, a plurality of prepacked members 10A are arranged so as to correspond to the positions of the legs at the bottom of the formwork 40. Then, on the plurality of prepacked members 10A, a prepacked member 10B is arranged so as to correspond to the positions of the legs at the top of the formwork 40. The prepacked member 10B is arranged so that the insertion hole 25 is aligned vertically at the center position in the planar direction so that the pressure pipe 50 can be inserted from above.

[0028] In the casting step, the solidification material is cast into the formwork 40. By casting the solidification material into the formwork 40, the solidification material can be filled into the gaps between the prepacked members 10 and between the coarse aggregates 30 in the prepacked members 10. As shown in FIG. 6, in the casting step, first, a pressure pipe 50 for pressure-feeding the solidification material is inserted into the formwork 40. It is preferable that the tip of the pressure pipe 50 is inserted to the vicinity of the bottom of the formwork 40 so that no gaps are left in the formwork 40. In this embodiment, as shown in FIG. 6, the pressure pipe 50 is inserted into the insertion hole 25 of the second-stage prepacked member 10B, and the pressure pipe 50 is inserted into the formwork 40 so that the tip of the pressure pipe 50 is disposed between the first-stage prepacked members 10A. As shown in FIG. 6, the solidification material may be injected through an opening provided in the upper part of the form 40, or, for example, an opening may be provided in the lower part of the form 40 and the solidification material may be injected through the lower opening.

[0029] The solidification material may contain cement, or may contain a non-cement-based solidification material such as polymer mortar. The solidification material may contain water or seawater in addition to cement. The solidification material may be, for example, a paste in which a material containing cement and water or seawater is mixed. The water may be, for example, tap water or well water.

[0030] The cement may be, for example, Portland cement, mixed cement, or ecocement. The Portland cement may be normal Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, sulfate-resistant Portland cement, moderate-heat Portland cement, or low-heat Portland cement. The mixed cement may be blast-furnace cement, silica cement, fly ash cement, or alumina cement. The ecocement may be cement made from municipal waste incineration ash or the like.

[0031] The solidification material may contain aggregate. The aggregate may contain at least one of coarse aggregate and fine aggregate. As the coarse aggregate, gravel, crushed stone, slag aggregate, recycled aggregate, and mixtures thereof can be used. As the fine aggregate, sand, crushed sand, slag aggregate, recycled aggregate, and mixtures thereof can be used.

[0032] The solidification material may contain an admixture as necessary, including, but not limited to, fly ash, blast furnace slag powder, expansive agent, silica fume, gamma belite, air entraining agent, water reducing agent, fluidizing agent, rust inhibitor, hardening accelerator, and setting retarder.

[0033] In the hardening process, the cast hardening material is hardened. The hardening conditions of the hardening material are not particularly limited, and for example, the hardening material may be hardened by leaving it for a predetermined period of time. After the hardening material has hardened, the formwork 40 is removed to obtain a block intermediate body having a desired shape.

[0034] The method for manufacturing a concrete structure may include a curing step of curing the block intermediate body formed by solidification of the solidification material. The curing method is not particularly limited, but examples thereof include standard curing, underwater curing, wet curing, film curing, accelerated curing, carbonation curing, and steam curing.

[0035] A concrete structure 100 can be manufactured by the method according to this embodiment. As shown in Fig. 7, the concrete structure 100 includes a plurality of prepacked members 10 and a hardened body 60 of a solidifying material. The prepacked members 10 include a storage member 20 and coarse aggregate 30 stored in the storage member 20. The hardened body 60 bonds the coarse aggregates 30 together and the prepacked members 10 together. The storage member 20 includes a holding portion that holds the coarse aggregate 30 and has a plurality of openings. The solidifying material passes through the plurality of openings in the holding portion to be solidified, and therefore the hardened bodies 60 of the solidifying material are disposed in the plurality of openings.

[0036] In this embodiment, the concrete structure 100 is a wave-dissipating block of a four-legged block. The wave-dissipating block is also called a wave-dissipating base-strengthening block or a wave-dissipating block. The wave-dissipating block is installed in the sea and rivers for the purpose of revetment, etc. The wave-dissipating block is not limited to a four-legged block, and may be, for example, a three-dimensional block such as a six-legged block or an eight-legged block, or a flat block. The concrete structure 100 obtained by this method is not limited to a wave-dissipating block, and may be, for example, a rectangular parallelepiped, a cylindrical block, a truncated cone, or other various shapes.

[0037] As described above, in the wire cage 20A and the wire cage 20B, the lid portion 23 is connected to the outer wall 22, but the lid portion 23 may be removable from the outer wall 22. The lid portion 23 is not essential, and the prepacked member 10 may be prepared using the wire cage 20A and the wire cage 20B without the lid portion 23. However, if the storage member 20 stores the coarse aggregate 30 so as to surround the entire periphery of the coarse aggregate 30, such as by providing the lid portion 23 to the wire cage 20A or the wire cage 20B, it is possible to prevent the coarse aggregate 30 from leaking out of the storage member 20 and scattering. In this embodiment, the wire cage 20A and the wire cage 20B have a cylindrical appearance. However, the shape of the wire cage 20A and the wire cage 20B is not particularly limited, and may be a cube, a rectangular parallelepiped, a polygonal prism, a sphere, an ellipsoid, a cone, or a cylinder.

[0038] In the above embodiment, the net cage 20A or 20B having a net-shaped retaining portion is used as the containing member 20. However, the retaining portion is not limited to a net-shaped portion, and may be a net-shaped portion, a lattice-shaped portion, a fence-shaped portion, a porous portion, or a combination of these. Such retaining portions allow the solidification material to easily pass through the openings, so that the solidification material can be efficiently filled into the formwork 40.

[0039] For example, instead of the wire cage 20A without insertion holes, a lattice cage 20C without insertion holes as shown in Fig. 8 may be used. Also, instead of the wire cage 20B with insertion holes, a lattice cage 20D with insertion holes as shown in Fig. 9 may be used. The wire cages 20A and 20B have mesh-shaped retaining parts, whereas the lattice cages 20C and 20D are different in that their retaining parts are lattice-shaped. Even when the lattice cage 20C and 20D are used, the prepacked member 10 can be produced by storing the coarse aggregate 30 therein.

[0040] Also, instead of the lattice-shaped retaining portion in which the rod-shaped members are combined in the height direction and the circumferential direction, a fence-shaped retaining portion in which the circumferential rod-shaped members are joined only to the ends in the height direction may be used.Furthermore, instead of these, a porous retaining portion having a plurality of holes, such as a punched metal, may be used.

[0041] In the above embodiment, the storage member 20 is described as a cage, but the storage member 20 may be a bag. That is, the storage member 20 may be a cage or a bag. By using a cage as the storage member 20, the coarse aggregate 30 in the storage member 20 can be prevented from contacting the formwork 40, and therefore, damage to the formwork 40 by the coarse aggregate 30 can be further prevented. By using a bag as the storage member 20, the shape of the prepacked member 10 can be easily deformed, and therefore, the conformability to the installation surface of the formwork 40 can be improved. This allows the filling density of the coarse aggregate 30 in the formwork 40 to be further increased.

[0042] For example, a mesh bag 20E of a type without an insertion hole as shown in Figs. 10 to 13 may be used as the containing member 20. Also, a mesh bag 20F of a type with an insertion hole having an insertion hole 25 as shown in Figs. 14 to 15 may be used as the containing member 20. By containing coarse aggregate 30 in the mesh bag 20E and the mesh bag 20F, the prepacked member 10E and the prepacked member 10F can be obtained, respectively. In the mesh bag 20E and the mesh bag 20F, the containing member 20 is a bag. Therefore, the shape of the prepacked member 10 is easily deformed, and therefore the conformability to the installation surface of the formwork 40 can be improved.

[0043] When the storage member 20 is a cage, the holding portion may include a rod-shaped member, a wire-shaped member, a rectangular column member, or a combination thereof. The material of the holding portion may include at least one metal selected from the group consisting of iron, copper, and zinc. Specifically, the material of the holding portion may be stainless steel or brass. The holding portion may include reinforcing bars such as deformed bars or round steel bars. By including reinforcing bars in the holding portion, a reinforcing effect of the concrete structure 100 can be expected. The holding portion may be plated with a metal such as zinc, or may not be plated. The holding portion may be a cement solidified body, for example. The holding portion may be plastic, for example.

[0044] When the storage member 20 is a bag, the holding portion may include a linear member. The linear member may be a rope, a string, a thread, or a combination of these. The material of the holding portion may be a metal, a resin, or a composite of these. The resin may be a known material such as polypropylene, polyester, or nylon, but it is preferable that the resin contains polyester because it is inexpensive and has excellent strength. The holding portion may contain, for example, polyester fiber.

[0045] In the above embodiment, a plurality of prepacked members 10A and one prepacked member 10B are arranged in the formwork 40 so as to correspond to the legs of the formwork 40. However, as shown in Fig. 16, the prepacked members 10 may be arranged such that a plurality of prepacked members 10G are arranged in positions corresponding to the legs of the bottom of the formwork 40, and a prepacked member 10H having an insertion hole is arranged in the center of the first layer from the bottom in the planar direction. Then, a second layer of prepacked members 10H may be arranged on the first layer of prepacked members 10H, and the insertion holes 25 of the first and second layers of prepacked members 10H may be arranged so as to communicate in the vertical direction.

[0046] 17, instead of the cylindrical prepacked members 10A and 10B, prepacked members 10I and 10J each having a shape conforming to the shape of the legs of the formwork 40 may be used. This allows a larger amount of coarse aggregate 30 to be filled into the formwork 40.

[0047] 18, wide-type prepacked members 10K and 10L that are shorter in height than prepacked members 10A and 10B and have a cylindrical diameter greater than their height may be used. This makes it easier to stack the prepacked members 10 and allows many prepacked members 10 to be placed in the formwork 40. As a result, more coarse aggregate 30 can be filled in the formwork 40.

[0048] 19, bag-type prepacked materials 10M and 10N may be used. Compared with the basket-type prepacked materials 10, the bag-type prepacked materials 10 are easily deformed, and therefore can be laid out along the shape of the formwork 40. Therefore, more coarse aggregate 30 can be filled into the formwork 40.

[0049] In manufacturing the concrete structure 100, only the bag-type prepacked members 10 may be used, only the basket-type prepacked members 10 may be used, or both the bag-type and basket-type prepacked members 10 may be used in combination.

[0050] As described above, the manufacturing method for the concrete structure 100 according to this embodiment includes a step of placing the prepacked member 10, which includes the containing member 20 and the coarse aggregate 30 contained in the containing member 20, in a formwork 40. This method includes a step of pouring a solidifying material into the formwork 40, and a step of hardening the poured solidifying material. The containing member 20 includes a holding portion that holds the coarse aggregate 30 and has a plurality of openings through which the solidifying material can pass.

[0051] According to the manufacturing method for the concrete structure 100 of this embodiment, the prepacked members 10 are used and placed in the formwork 40. Therefore, by installing the prepacked members 10 when assembling the formwork 40, damage to the formwork 40 by the coarse aggregate 30 can be suppressed. Furthermore, since the work of manually adding coarse aggregate 30 such as concrete debris when assembling the formwork 40 is eliminated, labor can be saved. Therefore, according to the manufacturing method for the concrete structure 100 of this embodiment, coarse aggregate such as concrete debris can be easily placed in the formwork 40, and construction efficiency can be improved. [Explanation of symbols]

[0052] 10 Prepacked materials 20. Storage material 30 Coarse aggregate 40 Formwork 50 Pressure Pipe 60 Hardened body 100 Concrete Structures

Claims

1. A step of placing a prepacked member including a container member and the coarse aggregate contained in the container member in a formwork; Pouring a solidification material into the formwork; A step of hardening the cast solidification material; Including, A method for manufacturing a concrete structure, wherein the storage member includes a holding portion that holds the coarse aggregate and has a plurality of openings through which a solidification material can pass.

2. The method for manufacturing a concrete structure according to claim 1 , wherein the solidification material includes cement.

3. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the retaining portion is in a mesh-like, lattice-like, fence-like, porous, or combination thereof.

4. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the container member is a basket or a bag.

5. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the coarse aggregate includes concrete rubble.

6. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the coarse aggregate contains a carbonated hardened concrete body in which carbon dioxide is fixed.

7. 3. The method for manufacturing a concrete structure according to claim 1, wherein the prepacked member has an insertion hole into which a pressure pipe for pouring the solidification material can be inserted.

8. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the retaining portion includes a reinforcing bar.

9. The method for manufacturing a concrete structure according to claim 1 or 2, wherein the concrete structure is a wave-dissipating block.

10. A prepacked member including a container member and coarse aggregate contained in the container member; A hardened body of a solidification material that bonds the coarse aggregates together and the prepacked components together; Equipped with The storage member includes a holding portion that holds the coarse aggregate and has a plurality of openings, A concrete structure, wherein a hardened body of the solidification material is placed in the plurality of openings.

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