Concrete construction method

Abstract

To provide a construction method that enables easy confirmation of a concrete surface.SOLUTION: The construction method includes covering poured concrete 5 with a light-transmissive sheet member (S2), placing an inverted formwork member 16, which has multiple holes p of a size that allows a worker to perform tactile confirmation, on the covered sheet member 15 (S3), and fixing the inverted formwork member 16.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for constructing concrete having fluidity.

Background Art

[0002] In the construction of road and bridge slabs, precast concrete slabs are used, and fluid concrete is placed in the part where steel bars are installed. For example, Patent Document 1 discloses a precast concrete slab in which a ridge is provided at the bottom of one slab edge of a slab connection part so as to be longer than the protruding length of the steel bars protruding from the slab and cover the lower surface of the filling part by abutting against an adjacent slab, and the other slab end surface of the connection part is configured as a flat surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, in order to prevent the surface of the concrete from drying and improve the finish of the top surface, a formwork is used. However, in the case of highly viscous concrete, the air mixed in during placement is difficult to escape, and after hardening, when the formwork is removed, large bubbles are generated on the top surface, which hinders the finish of the surface of the concrete. Therefore, in order to check the surface of the concrete before hardening, it is necessary to remove the fixed formwork, and there has been a problem that it is difficult to determine the timing of removal.

[0005] Therefore, the present invention has been made in view of the above problems, and an example of the problem is to provide a construction method capable of easily checking the surface of concrete.

Means for Solving the Problems

[0006] In order to solve the above problems, the invention according to claim 1 includes a sheet member step of covering the placed concrete with a light-transmissive sheet member, a recessed form member step of placing a recessed form member having a plurality of holes of a size that can be confirmed by an operator's fingertip touch on the covered sheet member, and a fixing step of fixing the recessed form member.

[0007] Further, the invention according to claim 2 is characterized in that, in the concrete construction method according to claim 1, the sheet member is a transparent vinyl sheet.

[0008] Further, the invention according to claim 3 is characterized in that, in the concrete construction method according to claim 1 or claim 2, the recessed form member is a mesh member, and the size of the mesh of the mesh member is a size that can be confirmed by fingertip touch.

[0009] Further, the invention according to claim 4 further includes a confirmation step in which the operator confirms the state of the concrete by fingertip touch from above the sheet member through the holes of the recessed form member, and a finishing work step of performing finishing work on the surface of the concrete after the confirmation.

[0010] Further, the invention according to claim 5 includes an installation step of installing a partition plate so that the floor slab on which the concrete is placed is installed with a gradient and is divided into a plurality of sections in the direction of the gradient, and a placing step of pouring and placing the concrete into the target section partitioned by the partition plate. In the sheet member step, when the height of the concrete in the target section reaches a predetermined value or more, the sheet member is covered, and in the recessed form member step, the recessed form member is placed in the target section.

[0011] Further, the invention according to claim 6 is the concrete construction method according to claim 5, further comprising: an adjacent section placing step of placing the concrete by pouring it into an adjacent section adjacent to the climbed side of the target section; a removing step of removing the partition plate between the target section and the adjacent section; and a mixing step of mixing the concrete near the boundary between the target section and the adjacent section after removing the partition plate.

[0012] Further, the invention according to claim 7 is the concrete construction method according to claim 6, further comprising: a pressure step of applying pressure from the placing port, wherein on the climbing side, a placing port is provided in the partitioned end section, and the sheet member is installed around the placing port so that the concrete is less likely to leak, and the pressure is applied from the placing port in a state where the partition plate is not present.

Advantages of the Invention

[0013] According to the present invention, by covering the placed concrete with a light-transmissive sheet member, placing a recessed form member having a plurality of holes of a size that can be confirmed by the operator's finger touch on the covered sheet member, and fixing the recessed form member, the operator can visually check the surface of the concrete covered by the sheet member or touch the concrete through the holes of the recessed form member, and thus can easily check the surface of the concrete.

Brief Description of the Drawings

[0014]

Figure 1A

Figure 1B

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 4C

Figure 4D

Figure 4E

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 6D

Figure 6E

Figure 6F

Figure 6G

Figure 6H

Figure 6I

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are embodiments when the present invention is applied to concrete construction or the like.

[0016] (First Embodiment) [1. Configuration and Functional Outline of Concrete Construction Structure According to First Embodiment] First, the configuration and outline functions of the concrete construction structure in the concrete construction method according to an embodiment of the present invention will be described with reference to FIGS. 1A to 2.

[0017] FIG. 1A is a schematic diagram schematically showing a cross section of a concrete construction structure formed by the concrete construction method according to the present embodiment. FIG. 1B is a plan view schematically showing the concrete construction structure of FIG. 1A. FIG. 2 is a schematic diagram showing an example of a formwork member.

[0018] As shown in FIG. 1A, the concrete construction structure 1 according to the present embodiment includes a floor slab 10 serving as a base, a side formwork member 11 forming the lateral side of the formwork for the concrete 5, a sheet member 15 covering the placed concrete 5, and a formwork member 16 placed on the sheet member 15. The placing port 13 is a port for finally placing the concrete 5 and applying pressure inside the concrete construction structure 1. As shown in FIGS. 1A and 1B, the concrete construction structure 1 is formed long in the longitudinal direction of roads, railways, bridges, etc. Note that in FIGS. 1A and 1B, the reinforcing bars and the fixing members for fixing the formwork member 16 are not shown.

[0019] The concrete 5 is, for example, a highly fluid concrete having fluidity when placed. The concrete 5 is preferably a self-compacting high-fluidity concrete of rank 2 with a box-shaped or U-shaped filling height of 300 [mm] or more, a target value of slump flow of 650 [mm], and a target value of 500 mm flow arrival time of 3 to 15 [seconds]. The concrete 5 may have a target value of slump flow of 600 to 750 [mm] and a target value of 500 mm flow arrival time of 10 to 50 [seconds]. Since they are target values, the values of the concrete during actual construction may deviate from the ranges of these target values. Note that the concrete used in the construction of the present application has high viscosity, so air mixed in during placement tends not to escape easily.

[0020] The floor slab 10 is formed by connecting a plurality of precast floor slabs made of concrete having PC (Prestressed Concrete) steel materials. The precast floor slab has a planar shape with a predetermined thickness. The joint of the precast floor slab has reinforcing bars and the like. The floor slab 10 is formed by arranging the precast floor slabs facing each other at the base portions of roads, railways, bridges, etc.

[0021] The side form member 11 is made of a material such as metal, wood, or reinforced plastic. As shown in FIG. 1B, the side form member 11 is installed so as to surround the concrete 5.

[0022] The placement port 13 has a funnel shape with a square mouth shape. The shape of the mouth may be any shape as long as it does not affect the placement. As shown in FIGS. 1A and 1B, it is installed at the corner of the square frame formed by the side form member 11. The sheet member 15 covers the periphery of the lower mouth of the placement port 13 without gaps so that the placed concrete 5 does not leak out from around the placement port 13.

[0023] The sheet member 15 is a transparent vinyl sheet having light transmissibility. The sheet member 15 is made of a plastic material such as polyethylene or polypropylene. The material of the sheet member 15 is preferably a material without moisture permeability so that the concrete 5 does not dry. The thickness of the sheet member 15 may be such that an operator can press it with a finger to observe the hardening of the concrete 5 and it will not be torn by the pressure when the concrete 5 is placed. The transparency of the sheet member 15 may be such that air bubbles rising from the surface of the concrete 5 can be observed.

[0024] As shown in FIG. 2, the recessed form member 16 is a mesh-shaped member. The recessed form member 16 is made of metal or the like and has holes p. The size of the holes p is preferably such that an operator's finger can pass through. Also, when the recessed form member 16 is removed, the concrete 5 bulges at the hole p portion. If the bulge is high, it takes time for the finishing work, so the size of the holes p is preferably below a predetermined value. The thickness of the mesh frame portion of the recessed form member 16 is preferably a thickness that is not easily bent by the pressure when the concrete 5 is placed. The hole p is an example of a hole having a size that an operator can confirm by finger touch.

[0025] For example, the recessed form member 16 is expanded metal which is an example of a mesh-shaped member. It is made of iron expanded metal, the size of the diamond-shaped mesh is 50.8 [mm] in the width direction of the long side and 22 [mm] in the width direction of the short side, and the wire diameter or plate thickness is 1.6 [mm]. When the shape of the hole is a square of 50 [mm] × 50 [mm], the bulge of the concrete 5 tends to increase. The diamond-shaped mesh portion is an example of a hole having a size that an operator can confirm by finger touch.

[0026] The recessed form member 16 may be a perforated metal, and the size of the holes is preferably such that the fingers of the operator can pass through. When the recessed form member 16 is removed, it is preferable that the rise of the concrete 5 is below a predetermined value with respect to the size of the holes in the perforated metal. The spacing of the holes in the perforated metal is preferably a thickness that is not easily bent by the pressure when the concrete 5 is placed. The holes in the perforated metal are an example of holes of a size that allows the operator to confirm by fingertip. Note that the sheet member 15 and the recessed form member 16 are integrated to form a recessed form, which prevents the flow of the concrete 5 and prevents drying.

[0027] [2. Operation example of the concrete construction method according to the first embodiment] Next, an operation example of the concrete construction method will be described with reference to the drawings.

[0028] FIG. 3 is a flowchart showing an example of the operation of concrete construction according to the first embodiment. FIGS. 4A to 4E are schematic diagrams schematically showing an example of the construction procedure in the concrete construction method.

[0029] As shown in FIG. 3, the concrete 5 is placed (step S1). Specifically, first, as shown in FIG. 4, the side form member 11, the floor slab 10 with the precast floor slab laid, and the placing port 13 are installed at the construction site. Immediately before placing, the floor slab 10 is wetted by spraying or the like. The concrete 5 is poured from the packet 14 onto the floor slab 10 within the frame of the side form member 11, and the placing of the concrete 5 is started. As shown in FIG. 4B, the packet 14 is moved until it reaches the top end of the side form member 11 to place the concrete 5. The placing start position is preferably a position away from the installation position of the placing port 13.

[0030] Next, the sheet member 15 is covered (step S2). Specifically, as shown in FIG. 4C, an operator covers the sheet member 15 so as to cover the surface of the concrete 5 placed within the frame of the side form member 11. The operator installs the sheet member 15 so that the concrete 5 does not leak from around the placement opening 13 or from the boundary portion of the side form member 11. Note that as the packet 14 moves, starting from the point where the concrete 5 reaches the top end (an example of a predetermined height) of the side form member 11, the sheet member 15 may be covered while unfolding the roll-shaped sheet member 15. This step is an example of a sheet member step of covering a light-transmissive sheet member on the concrete placed on the floor slab. The sheet member 15 is installed so that the concrete 5 is less likely to leak from around the placement opening 13.

[0031] Next, the inverted form member 16 is placed (step S3). Specifically, as shown in FIG. 4D, an operator places the inverted form member 16 on the sheet member 15 covering the concrete 5. This step is an example of an inverted form member step of placing an inverted form member having a plurality of holes of a size that allows an operator to confirm by finger touch on the covered sheet member.

[0032] Next, the inverted form member 16 is fixed by the fixing member 17 (step S4). Specifically, as shown in FIG. 4E, an operator passes the rod-shaped fixing member 17 over the inverted form member 16 and fixes the end of the fixing member 17 to the side form member 11 side with bolts or the like. Thereby, the inverted form member 16 is fixed by the fixing member 17 so that the inverted form member 16 does not shift or come off due to the pressure from the packet 14. When the inverted form member 16 is slightly pushed downward by the fixing member 17, the concrete 5 bulges slightly from the holes p of the inverted form member 16. This step is an example of a fixing step of fixing the inverted form member.

[0033] Next, pressure is applied (step S5). Specifically, the operator connects the packet 14 to the placing opening 13, places the concrete 5 from the packet 14, starts from the placing opening 13, and lifts it up by about 20 cm. At this time, pressure is applied to the concrete 5 in the concrete construction structure 1 from the placing opening 13. As a result, the air inside is expelled from the concrete 5 in the concrete construction structure 1. At this time, the concrete 5 bulges from the hole p of the recessed member 16. For anti-drying measures, a vinyl sheet or the like is adhered to the surface inside the placing hole of the placing opening 13 to complete the placing.

[0034] Next, the operator confirms the finishing time by finger touch (step S6). Specifically, after a predetermined time (for example, the timing when it is confirmed that the flow of the concrete has stopped), the operator observes the state of the bubbles gathering on the surface of the concrete 5 from the hole p of the recessed member 16, or the operator touches or presses the surface of the concrete 5 through the hole p via the sheet member 15 with a finger to confirm the curing state of the concrete 5. Due to the pressure of the concrete 5, the sheet member 15 bulges from the hole p of the recessed member 16, so bubbles tend to accumulate where it bulges. Through the transparent sheet member 15 with light transmissivity, the bubbles can be easily observed. Since the sheet member 15 bulges from the hole p of the recessed member 16, it is easy to touch with a finger. This step is an example of a confirmation step in which the operator confirms the state of the concrete by finger touch from above the sheet member through the hole of the recessed form member.

[0035] Next, the finishing work is performed (step S7). Specifically, before the concrete 5 completely cures, the operator removes the fixing member 17, the recessed member 16, and the sheet member 15. Next, the operator performs finishing work on the surface of the concrete 5, such as scraping the bulging portion of the concrete 5 by the hole p of the recessed member 16. This step is an example of a finishing work step for performing finishing work on the surface of the concrete after the confirmation.

[0036] According to the concrete construction method according to the first embodiment, a light-transmissive sheet member 15 is placed on the concrete 5 placed on the floor slab 10, and a formwork member 16 having a plurality of holes of a size that can be confirmed by the operator's finger touch is placed on the placed sheet member 15, and the formwork member 16 is fixed. As a result, the operator can visually check the surface of the concrete 5 covered by the sheet member 15 or touch the concrete 5 through the holes p of the formwork member 16, and the surface of the concrete 5 can be easily confirmed. It becomes easy to judge the finishing time etc. without removing the formwork member 16 etc. Since the surface of the concrete 5 can be visually checked without removing the formwork member 16 etc., it becomes easy to manage the quality of the concrete 5.

[0037] Also, in the case of highly viscous concrete, the air mixed in during placing is difficult to escape, and bubbles come up to the surface of the concrete 5 later, so surface finishing work of the concrete 5 is often required. According to the concrete construction method according to the first embodiment, since the surface of the concrete 5 can be visually checked or touched without removing the formwork member etc., the surface finishing work of this concrete 5 can be accurately performed.

[0038] When the sheet member 15 is a transparent vinyl sheet, since it is transparent, bubbles are easier to observe. Also, the sheet member 15 can prevent the concrete 5 from drying. Also, although a transparent formwork made of reinforced plastic is expensive, the cost can be reduced by using an inexpensive vinyl sheet and expanded metal.

[0039] When the formwork member 16 is a mesh member and the size of the mesh of the mesh member is of a size that can be confirmed by finger touch, since the formwork member 16 is lightweight and easy to handle, the installation and removal work can be easily performed. Therefore, the construction speed is improved and a shortening of the construction period can be expected.

[0040] When an operator checks the state of the concrete 5 by touching it from above the sheet member 15 through the hole p of the recessed form member 16, and if finishing work is to be performed on the surface of the concrete 5 after the check, the surface of the concrete 5 can be checked without removing the recessed form member 16, and the finishing work on the surface of the concrete 5 can be easily performed before it hardens.

[0041] (Second Embodiment) [3. Operation Example of Concrete Construction Method According to Second Embodiment] A concrete construction method when the floor slab 10 is installed with a gradient will be described with reference to FIGS. 5 to 6I. Note that, for the same or corresponding parts as those in the first embodiment, only different configurations and operations will be described using the same reference numerals. The same applies to other embodiments and modifications.

[0042] FIG. 5 is a flowchart showing an example of the operation of concrete construction according to the second embodiment. FIGS. 6A to 6I are schematic diagrams schematically showing an example of the construction procedure in the concrete construction method.

[0043] As shown in FIG. 5, the partition plate 20 is installed (step S10). Specifically, as shown in FIG. 6A, a floor slab 10 having a gradient is installed at the construction site, and side form members 11 are installed around the floor slab 10. The partition plate 20 is installed so that the area surrounded by the side form members 11 is divided into a plurality of sections in the gradient direction d. The placing port 13 is installed at a portion of the side form member 11 in the most uphill section. In this way, on the uphill side, a placing port is provided in the terminated section that is partitioned. This step is an example of an installation step of installing a partition plate so that the floor slab for placing concrete is installed with a gradient and is divided into a plurality of sections in the gradient direction.

[0044] Next, placement is performed in the first section (step S11). Specifically, as shown in FIG. 6B, the floor slab 10 of the first section at the lowest gradient end is wetted by spraying or the like by the operator immediately before placement. Concrete 5 is poured from the hopper 14 onto the floor slab 10 within the frame partitioned by the side formwork member 11 and the partition plate 20 of the first section, and the placement of the concrete 5 for the first section is started. The first section is an example of a target section partitioned by a partition plate. This step is an example of a placement step of pouring and placing the concrete into the target section partitioned by the partition plate.

[0045] Next, it is determined whether it is the last section (step S12). Specifically, it is determined whether it is the uppermost section which is the steepest side where the placement port 13 is installed.

[0046] If it is not the last section (step S12; NO), the adjacent section is placed (step S13). Specifically, as shown in FIG. 6C, concrete 5 is poured from the hopper 14 into an adjacent section adjacent to the first section (an example of an adjacent section adjacent on the ascending side of the target section), and the placement of the concrete 5 is performed. This step is an example of an adjacent section placement step of pouring and placing the concrete into an adjacent section adjacent on the ascending side of the target section.

[0047] Next, a sheet member is covered, a covering form member is placed, and the covering form member is fixed (step S14). Specifically, as shown in FIG. 6C, like in step S2, the operator covers the sheet member 15 while unfolding the roll-shaped sheet member 15 so as to cover the surface of the concrete 5 placed in the first section.

[0048] Next, as shown in FIG. 6D, like in step S3 and step S4, the operator places the covering formwork member 16 on the sheet member 15 covering the concrete 5. Next, like in step S4, the operator passes a rod-shaped fixing member 17 (not shown) over the covering form member 16 and fixes the end of the fixing member 17 on the side of the side formwork member 11.

[0049] Next, the partition plate 20 at the boundary is removed, and the concrete 5 is stirred (step S15). Specifically, immediately before the concrete 5 flowing into the adjacent section adjacent to the first section reaches the top end, the partition plate 20 at the boundary between the first section and the adjacent section adjacent thereto is removed. Since the fibers are not continuous in this removed portion, as shown in FIG. 6E, the concrete 5 in the removed portion is stabbed and stirred about 10 times using a stabbing rod 21 or the like. This step is an example of a removal step of removing the partition plate between the target section and the adjacent section. This step is an example of a mixing step of mixing the concrete near the boundary between the target section and the adjacent section after removing the partition plate.

[0050] Next, return to step S12, and it is determined whether it is the last section. If it is not the last section, when the placement in the adjacent section adjacent to the first section is completed as in step S13, as shown in FIG. 6E, the packet 14 is transferred to the next adjacent section and the placement is started.

[0051] Next, after the concrete 5 at the boundary of the section in step S15 is mixed, in step S14, as shown in FIG. 6F, the operator covers the adjacent section with the sheet member 15, places the covering member 16, and fixes the covering member.

[0052] Next, in step S15, as shown in FIG. 6G, the partition plate 20 at the boundary is removed, and the concrete 5 is stirred.

[0053] The operations from step S12 to step S15 are repeated to drive the concrete 5 into the uppermost section. In the case of the uppermost section, as shown in FIG. 6H, the operator installs the sheet member 15 so that the concrete 5 placed from around the placement port 13 or from the boundary portion of the side form member 11 does not leak out.

[0054] When it is the last section (step S12; YES), pressure is applied (step S16). Specifically, the placement of the uppermost section is performed from the placement opening 13 and the concrete is lifted up by about 20 cm. At this time, pressure is applied to the concrete 5 in the concrete construction structure 2 from the placement opening 13. As a result, the air inside is expelled from the concrete 5 in the concrete construction structure 2. At this time, the concrete 5 bulges from the hole p of the recessed member 16.

[0055] Next, as shown in FIG. 6I, for the purpose of preventing drying, a vinyl sheet or the like is adhered to the surface inside the placement hole of the placement opening 13 to complete the placement.

[0056] Next, the operator confirms the finishing time by touch (step S17). Specifically, after a predetermined time as in step S6, the operator observes the state of the bubbles gathering on the surface of the concrete 5 from the hole p of the recessed member 16, or the operator presses the surface of the concrete 5 through the hole p to confirm the degree of hardening of the concrete 5.

[0057] Next, the finishing work is performed (step S18). Specifically, as in step S7, before the concrete 5 is completely hardened, the operator removes the fixing member, the recessed member 16, and the sheet member 15. Next, the operator performs the finishing work on the surface of the concrete 5, such as shaving the bulging portion of the concrete 5 by the hole p of the recessed member 16.

[0058] According to the concrete construction method according to the second embodiment, the floor slab 10 is installed with a slope, and the partition plate 20 is installed so as to be partitioned into a plurality of sections in the direction of the slope. The concrete 5 is poured and placed into the target section partitioned by the partition plate 20. When the height of the concrete 5 in the target section reaches a predetermined value or more, the sheet member 15 is covered, and in the target section, the inverted form member 16 is placed. Thus, in the entire concrete construction structure 2, the concrete 5 does not flow out upward, the construction becomes easier, and the construction period is shortened. Further, even if the construction location has a slope, the flow of the concrete 5 can be prevented by the sheet member 15, the inverted form member 16, and the concrete construction structure 2 having the inverted form.

[0059] Also, in the adjacent section adjacent to the ascending side of the target section, the concrete 5 is poured and placed, the partition plate 20 between the target section and the adjacent section is removed, and after the partition plate is removed, when the concrete 5 near the boundary between the target section and the adjacent section is mixed, the concrete 5 near the boundary between the sections becomes homogeneous, and the construction quality is further improved.

[0060] Also, on the ascending side, a placing port 13 is provided in the partitioned end section, and the sheet member 15 is installed so that the concrete 5 does not leak easily from around the placing port 13. When pressure is applied from the placing port 13 in a state where the partition plate 20 is not present, the internal air is expelled from the concrete 5 in the concrete construction structure 2, and the construction quality is further improved.

Explanation of reference numerals

[0061] 1, 2: Concrete construction structure 5: Concrete 10: Floor slab 15: Sheet member 16: Inverted form member p: Hole

Claims

1. A sheet member step of covering the placed concrete with a light-transmissive sheet member; A formwork member laying step of laying a formwork member having a plurality of holes of a size that can be confirmed by an operator's fingertip touch on the covered sheet member; A fixing step of fixing the formwork member; A concrete construction method characterized by including the above.

2. In the concrete construction method according to Claim 1, The concrete construction method is characterized in that the sheet member is a transparent vinyl sheet.

3. In the concrete construction method according to Claim 1 or Claim 2, The formwork member is a mesh member, The concrete construction method is characterized in that the size of the mesh of the mesh member is the size that can be confirmed by fingertip touch.

4. In the concrete construction method according to Claim 1 or Claim 2, A confirmation step in which the operator confirms the state of the concrete by fingertip touch from above the sheet member through the holes of the formwork member; A finishing step of performing finishing work on the surface of the concrete after the confirmation; The concrete construction method is further characterized by including the above.

5. In the concrete construction method according to Claim 1 or Claim 2, The floor slab on which the concrete is placed is installed with a gradient, An installation step of installing a partition plate so as to be divided into a plurality of sections in the direction of the gradient; A placing step of pouring and placing the concrete into the target section partitioned by the partition plate; The concrete construction method further includes the above, In the sheet member step, in the target section, when the height of the concrete reaches a predetermined value or more, the sheet member is covered; In the formwork member laying step, in the target section, the formwork member is laid. The concrete construction method is characterized by the above.

6. In the concrete construction method according to Claim 5, An adjacent section placing step of pouring and placing the concrete into an adjacent section adjacent to the ascending side of the target section; A removal step of removing the partition plate between the target section and the adjacent section; A mixing step of mixing the concrete near the boundary between the target section and the adjacent section after removing the partition plate; The concrete construction method is further characterized by including the above.

7. In the concrete construction method according to Claim 6, On the ascending side, a placing opening is provided in the partitioned end section, The sheet member is installed around the placing opening so as to prevent the concrete from leaking, A concrete construction method characterized by further including a pressure step of applying pressure from the placing opening in a state where the partition plate is not present.

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