JP5872940B2 - Construction method for concrete structures - Google Patents

Description

  The present invention relates to a concrete structure and a construction method for the concrete structure.

  As a construction method for concrete structures constructed at sea or in river revetments, etc., the foundation material such as steel pipes and sheet pile walls embedded in the ground is covered with a precast block, and then the concrete inside the block There is a method of placing.

  The following Patent Document 1 discloses that a concrete shed block is adopted as a precast block, and the position of the concrete shed block is adjusted using a height adjusting bracket or a positioning bracket when the concrete shed block is installed. Patent Document 2 discloses a construction method in which a shade block having a bottom plate attached so as to be position-adjustable is used as a precast block. This bottom plate has a shape that fits the unevenness in the left and right direction of the front face of the sheet pile wall as the base material, and by adjusting the mounting position of the bottom plate, the gap between the shade block and the sheet pile wall as the base material is formed. Can be closed.

Registered Utility Model No. 3027932 JP 2010-180661 A

  By the way, usually, in the step of driving the base material into the ground, a construction error occurs in the height direction between the parallel base materials. In this regard, in the invention described in Patent Document 1, since the position adjustment in the height direction can be performed when the precast block is installed, the precast block can be installed in accordance with the height. However, every time a precast block is installed, it is necessary to adjust the position, and improvement in construction efficiency has been desired. On the other hand, in the invention described in Patent Document 2, although the position of the precast block can be adjusted efficiently, the position in the height direction cannot be adjusted.

  Then, an object of this invention is to provide the construction method which can improve construction efficiency, adjusting the installation position in the height direction of a precast block.

For solving the above problem, the construction method of the concrete structure according to the present invention, one is embedded in the sea bed, the other protruding above the water surface, a plurality of basic materials upper ends are apart from sequences to each other, A step of attaching each of the rail laying brackets, a step of attaching the upper precast receiving rail so as to connect the rail laying brackets on the rail laying bracket, and a step of installing a plurality of precast blocks side by side on the upper precast receiving rail. When mounting the rail laying bracket, the rail laying surface of the rail laying bracket has a common height, and the precast block has a pair of opposing side wall parts, and a top end part that connects the side wall parts, And a rail receiving portion that connects the side wall portions and receives the upper precast receiving rail.

  This construction method includes a step of attaching a rail laying bracket for adjusting the height of the base material to a plurality of base materials, respectively, and a rail laying surface of the rail laying bracket when the rail laying bracket is attached. With a common height. For this reason, the installation position in the height direction of the precast block can be easily adjusted by changing the mounting position of the rail laying bracket. Moreover, since it is not necessary to adjust the position by moving the precast block itself, it is possible to improve the construction efficiency while adjusting the installation position in the height direction of the precast block. In the construction method, the upper precast receiving rail is attached on the rail laying bracket so as to join the rail laying brackets. For this reason, the horizontal installation position of the precast block can be easily adjusted by sliding the precast block on the precast receiving rail in the step of arranging a plurality of precast blocks side by side on the upper precast receiving rail.

  In the step of arranging a plurality of precast blocks side by side, it is preferable that the precast blocks are temporarily placed on the upper precast receiving rail, and then the precast blocks on the upper precast receiving rail are moved laterally and joined to the adjacent precast blocks. In this case, after temporarily placing the precast block on the upper precast receiving rail, the precast block is slid and moved laterally to join adjacent precast blocks. Therefore, a plurality of precast blocks can be easily installed side by side.

The method for constructing a concrete structure according to the present invention includes a step of attaching rail laying brackets to a plurality of foundation members, one of which is embedded in the bottom of the water and the other of which protrudes above the water surface, and the rail laying on the rail laying bracket. Mounting the upper precast receiving rail so as to connect the brackets to each other and a step of installing a plurality of precast blocks side by side on the upper precast receiving rail. The rail laying surfaces of the precast block have a common height, and the precast block includes a pair of opposing side wall portions, a top end portion for connecting the side wall portions, and a rail receiving portion for connecting the side wall portions and receiving the upper precast receiving rail. a method comprising, before the step of installing the precast block, lower bra underlying material Mounting the lower precast receiving rail on the lower bracket, and placing the plurality of precast blocks side by side, placing the bottom of the precast block on the lower precast receiving rail Is preferred. In this case, since the precast block can be supported by the lower bracket, the precast block can be stably installed. Also, the lower bracket can be used as a scaffold during construction of a concrete structure.

It is preferable to further include a step of attaching a lower surface formwork to a gap between the bottom portion of the precast block and the base material, and a step of placing concrete inside the precast block . In this case, since the precast block and the lower precast receiving rail can be supported by the lower surface formwork, the precast block can be stably installed. Further, it is possible to reliably avoid leakage of the concrete in the subsequent concrete placing process.

  A fitting convex part is formed on one surface of the front surface and the back surface of the precast block, and a fitting concave part is formed on the other surface.In the step of installing a plurality of precast blocks side by side, among adjacent precast blocks, It is preferable to join the precast blocks by fitting one fitting convex portion and the other fitting concave portion. In this case, it is possible to ensure the water stoppage of the joint portion of the precast block.

  It is preferable to further include a step of attaching an inclination adjusting member for adjusting the inclination of the lower bracket relative to the base member between the base member and the lower bracket. In this case, even if the base material is driven obliquely with respect to the water surface, the precast block can be installed horizontally.

Concrete structure according to the present invention, one is embedded in the sea bed, the other protruding above the water surface, a plurality of basic materials upper ends are apart from sequences to each other, respectively attached to the base material, the basic material A rail laying bracket for adjusting the height, an upper precast receiving rail provided on the rail laying bracket and connecting between the rail laying brackets, and a plurality of precast blocks provided side by side on the upper precast receiving rail The rail laying bracket has a common rail laying surface, and the precast block connects the pair of side walls facing each other, the top end connecting the side walls, and the side walls, A rail receiving portion for receiving the upper precast receiving rail.

  According to the construction method according to the present invention, it is possible to improve the construction efficiency while adjusting the installation position in the height direction of the precast block.

It is a perspective view which shows the concrete structure constructed | assembled by the construction method which concerns on this embodiment. It is a perspective view which shows the precast block which concerns on this embodiment. It is a flowchart of the construction method which concerns on this embodiment. It is sectional drawing which shows the construction procedure which concerns on this embodiment. It is sectional drawing which shows the construction procedure following FIG.4 (b). 6 (a) and 6 (c) are cross-sectional views showing a construction procedure subsequent to FIG. 5 (c). FIG.6 (b) is the perspective view which expanded the part of the base material of Fig.6 (a). It is sectional drawing which shows the concrete structure which concerns on other embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a concrete structure 10 constructed by a construction method according to an embodiment of the present invention. The concrete structure 10 is constructed on the sea close to the land, and is used as a seawall, a quay for ship berthing, and a revetment for land reclamation. In FIG. 1, the front side of the concrete structure 10 is the land L, and the back side of the concrete structure 10 is the sea S. The concrete structure 10 includes a plurality of steel pipes 1 that are basic materials, and the plurality of steel pipes 1 are arranged in parallel along one direction. Also, land-side rail laying brackets 3 are respectively attached to the land sides of the plurality of steel pipes 1. Similarly, seaside rail laying brackets 4 are respectively attached to the sea side of the plurality of steel pipes 1. Both the land side rail laying bracket 3 and the sea side rail laying bracket 4 are made of steel.

  Further, an upper precast receiving rail 5 is laid on the plurality of land-side rail laying brackets 3 to connect the plurality of land-side rail laying brackets 3. An upper precast receiving rail 5 is also laid on a plurality of seaside rail laying brackets 4 to connect the plurality of seaside rail laying brackets 4. The land side rail laying bracket 3 and the sea side rail laying bracket 4 are laid substantially in parallel.

  In each of the land side rail laying brackets 3 attached to the plurality of steel pipes 1, the land side rail laying surface 3a has a common height. In each of the sea side rail laying brackets 4 attached to the plurality of steel pipes 1, The sea side rail laying surface 4a has a common height. The upper precast receiving rail 5 is configured by a steel member such as an H-shaped steel.

  A plurality of precast blocks 7 are provided on the land-side rail laying bracket 3 and the sea-side rail laying bracket 4. FIG. 2 is a perspective view showing the precast block 7 according to the present embodiment. As shown in FIG. 2, the precast block 7 has a cross-sectional shape that is L-shaped, and includes a pair of opposing side wall portions 11 and a top end portion 12 that connects the side wall portions 11. . The precast block 7 includes a bottom portion 13a continuous with the side wall portion 11, a fitting convex portion 13b, and a fitting concave portion 13c, and connects the pair of opposing side wall portions 11 to receive the upper precast receiving rail 5. The unit 14 is provided. The rail receiving portion 14 is made of steel, and the side wall portion 11, the top end portion 12, the bottom portion 13a, the fitting convex portion 13b, and the fitting concave portion 13c are made of concrete.

  The precast block 7 is produced in advance at a factory and is carried into a building site. The side wall part 11 is arranged on the land S side wall part 11a arranged on the land L side and the sea S side when the precast block 7 is installed on the land side rail laying bracket 3 and the sea side rail laying bracket 4. And a sea side wall portion 11b. The land side wall part 11a has a smaller area than the sea side wall part 11b, and the side mold 9a is attached later.

  A plurality of hooks that can be suspended by a crane are attached to the side wall portion 11 at appropriate positions. In addition, an insert for fixing a later-described side surface mold 9a and lower surface mold 9b with bolts is embedded in the side wall 11. An opening 12a is formed in the top end 12 so that concrete can be placed from the opening 12a. The precast block 7 has a width of about several meters, and a plurality of precast blocks 7 are arranged in parallel along the extending direction of the land side rail laying bracket 3 and the sea side rail laying bracket 4.

  The fitting convex portion 13 b is formed on the front surface of the precast block 7, and the fitting concave portion 13 c is formed on the back surface of the precast block 7. When the plurality of precast blocks 7 are installed side by side, if the front surfaces of the plurality of precast blocks 7 already arranged on the upper precast receiving rail 5 are exposed, they are already arranged with the fitting recesses 13c of the precast blocks 7 to be newly arranged. The fitting projections 13b of the plurality of precast blocks 7 are fitted and the precast blocks are joined to each other. On the other hand, when the plurality of precast blocks 7 are installed side by side, if the back surfaces of the plurality of precast blocks 7 already arranged on the upper precast receiving rail 5 are exposed, the fitting convex portion 13b of the precast block 7 newly arranged is arranged. And the fitting recesses 13c of the plurality of precast blocks 7 already arranged are fitted to each other and the precast blocks are joined to each other.

  Next, the procedure of the construction method according to this embodiment will be described. FIG. 3 is a flowchart of the construction method according to the present embodiment. Hereinafter, each process will be described in detail with reference to FIGS.

  FIG. 4 is a cross-sectional view showing a construction procedure according to the present embodiment. The right side of the steel pipe 1 is the land L, and the left side of the steel pipe 1 is the sea S. In the construction method according to the embodiment of the present invention, first, as shown in FIG. 4A, the steel pipe 1 is driven so that one is embedded in the seabed and the other protrudes from the water surface. Next, the steel pipe 1 is stabilized by connecting the steel pipe 1 with an anchor block (not shown) installed on the land L side and a tie rod 16. By the same procedure, a plurality of steel pipes 1 are provided along the seabed along one direction.

  Next, as shown in FIG. 4 (b), after the lower bracket 15 is lowered from the sea S side by the onboard crane 18 to a predetermined depth in the sea, the diver is welded in the sea to lower the lower bracket 15 to the steel pipe 1. Attach to the side. The lower bracket 15 is a steel frame, and includes a vertical member 15a, a horizontal member 15b, and a hypotenuse member 15c.

  The vertical member 15 a is disposed along the side surface of the steel pipe 1 and is fixed to the steel pipe 1. One end of the horizontal member 15b is joined to the upper end of the vertical member 15a with a bolt. Further, the horizontal member 15b is arranged in a horizontal direction in which the longitudinal direction is perpendicular to the longitudinal direction of the vertical member 15a. The hypotenuse member 15c is joined to the lower end portion of the vertical member 15a and the other end portion of the horizontal member 15b with a bolt, and connects the vertical member 15a and the horizontal member 15b.

  The diver D attaches the lower bracket 15 to the steel pipe 1 by welding the vertical member 15 a to the steel pipe 1 and fixing the vertical member 15 a to the steel pipe 1. Further, the lower bracket 15 is attached to each of the plurality of steel pipes 1 by the same procedure.

  Next, as shown in FIG. 5A, the lower precast receiving rail 17 is attached to the horizontal member 15b (S10). At this time, first, the lower precast receiving rail 17 is placed on the horizontal member 15b by the shipboard crane 18 from the sea S side. The lower precast receiving rail 17 is configured by arranging a plurality of steel members such as H-shaped steel, and when the lower precast receiving rail 17 is placed on the horizontal member 15b, each member of the lower precast receiving rail 17 is arranged. Common height. Thereafter, the lower precast receiving rail 17 is fixed to the horizontal member 15b by welding. Similarly, lower precast receiving rails 17 are also placed on horizontal members 15b attached to a plurality of adjacent steel pipes 1 and fixed by welding.

  After the lower precast receiving rail 17 is attached to the horizontal member 15 b, the lower formwork 9 b that closes the space between the bottom portions 13 a of the side wall portions 11 in the adjacent precast blocks 7 is attached onto the lower precast receiving rail 17 by welding. The lower surface mold 9b is horizontally mounted on the lower precast receiving rail 17 in which the height of each member is made common. The lower surface mold 9b is made of iron and is manufactured according to the dimensions of the precast block 7 in advance.

  After attaching the lower surface formwork 9b on the lower precast receiving rail 17, as shown in FIG. 5 (b), the land side rail laying bracket 3 and the sea side rail laying bracket 4 are attached to the side surface on the upper end side of the steel pipe 1. It is attached by welding (S11). The land side rail laying bracket 3 is attached to the side surface of the steel pipe 1 on the land L side, and the sea side rail laying bracket 4 is attached to the side surface of the steel pipe 1 on the land L side.

  At this time, the land-side rail laying brackets 3 attached to the plurality of steel pipes 1 are attached with the land-side rail laying surfaces 3a adjusted to a common height. Similarly, each of the seaside rail laying brackets 4 attached to the plurality of steel pipes 1 is attached with the seaside rail laying surface 4a adjusted to a common height. Next, the upper precast receiving rail 5 is laid on the land side rail laying bracket 3 by the onboard crane 18, and the upper precast receiving rail 5 is fixed to the land side rail laying bracket 3 by welding. Similarly, the upper precast receiving rail 5 is laid on the seaside rail laying bracket 4 by the shipboard crane 18, and the upper precast receiving rail 5 is fixed to the seaside rail laying bracket 4 by welding (S12).

  After the upper precast receiving rail 5 is attached, a plurality of precast blocks 7 are installed side by side on the upper precast receiving rail 5 by the onboard crane 18 (S13). As shown in FIG. 5 (c), the precast block 7 is installed by a signal person who monitors the installation position on the land L side and gives an instruction for installation, and an operator who installs the precast block 7 using an intermediate rope. This is done through collaboration. As a procedure for installing the plurality of precast blocks 7, as shown in FIG. 6A, first, the bottom portion 13 a is placed on the lower formwork 9 b and the rail receiving portion 14 is placed on the upper precast receiving rail 5. Temporary placement. At this time, when the precast blocks 7 that are already arranged are on the upper precast receiving rail 5, they are temporarily placed on the upper precast receiving rail 5 that is separated from the precast blocks 7 that are already arranged.

  Next, the position of the precast block 7 in the lateral direction is adjusted while sliding on the upper precast receiving rail 5 by pulling and pulling the chain block on the precast block 7 temporarily placed on the upper precast receiving rail 5. When the precast block 7 that is already arranged is on the upper precast receiving rail 5, the precast block 7 that is already arranged with the fitting convex part 13b or the fitting concave part 13c can be moved by sliding the precast block 7 sideways. The precast blocks 7 are joined to each other by fitting the fitting concave portion 13c or the fitting convex portion 13b of the block 7 together. Thereafter, the bottom portion 13a and the lower surface mold 9b and the rail receiving portion 14 and the upper precast receiving rail 5 are joined by welding. By repeating this procedure for each of the plurality of precast blocks 7, the precast blocks 7 are arranged in order.

  After installing the precast block 7, the side mold 9a that closes the space between the land side wall 11a of the precast block 7 and the ground is attached to the precast block 7 (S14). The side surface formwork 9a is attached to the land side wall portion 11a after the plurality of precast blocks 7 are installed. The side mold 9a is manufactured according to the dimensions of the precast block 7 in advance.

  When attaching the side formwork 9a, as shown in FIG. 6A, first, the reinforcing bar 90a is assembled so as to fill a gap between the land-side side wall 11a and the ground. Thereafter, the side mold 9 a is lifted from the land L side to a predetermined position by the crane 28, and the side mold 9 a is bolted to the precast block 7 using an insert embedded in the precast block 7 in advance.

  Here, a state where the lower surface mold 9b is attached will be described with reference to FIG. FIG. 6B is a perspective view showing a state after the lower surface mold 9b is attached. For convenience of explanation, the upper precast receiving rail 5 and the precast block 7 are omitted. As shown in FIG. 6B, the lower surface mold 9b is arranged on the side surface of the plurality of steel pipes 1 on the sea S side, and is attached to each steel pipe 1 by welding.

  After the side mold 9a is attached, concrete is placed inside the precast block 7 (S15). FIG.6 (c) is sectional drawing which showed a mode that concrete was laid. The concrete is placed by pumping concrete from the land L using the pumping vehicle 38 and pouring the concrete conveyed by the ready-mixed vehicle 48 from the opening 12 a of the precast block 7 into the precast block 7. For concrete placement, first place the underwater part using the underwater concrete, then harden the concrete once and then place the other part under the sea using ordinary concrete. Is done.

  Concrete placement is performed for each of the plurality of precast blocks 7 arranged at the same time. After the concrete is placed, the side mold 9a and the hypotenuse member 15c of the lower bracket 15 are removed after watering and curing. The lower surface mold 9b is left without being removed. Thus, the concrete structure 10 is completed.

  As described above, in the concrete structure construction method according to the present embodiment, the rail laying brackets 3 are respectively attached to the steel pipes 1 which are a plurality of foundation materials, one of which is embedded in the water bottom and the other of which protrudes on the water surface. In addition to the step of attaching, when attaching the rail laying bracket 3, the land side rail laying surfaces 3a of the land side rail laying brackets 3 attached to the plurality of steel pipes 1 have a common height. Similarly, the sea-side rail laying surface 4a of the sea-side rail laying bracket 4 attached to the plurality of steel pipes 1 has a common height. For this reason, the installation position in the height direction of the precast block 7 can be easily adjusted by changing the mounting position of the land side rail laying bracket 3 and the sea side rail laying bracket 4 attached to the plurality of steel pipes 1. it can. The base material is made of steel, and a steel pipe, a sheet pile wall, a steel pipe sheet pile, or the like can be suitably used.

  Moreover, since it is not necessary to adjust the position by moving the precast block 7 itself, the construction method can improve the construction efficiency while adjusting the installation position of the precast block 7 in the height direction. Furthermore, this construction method includes a step of attaching the upper precast receiving rail 5 so as to connect between the land-side rail laying brackets 3 on the land-side rail laying brackets 3. Moreover, the process of attaching the upper precast receiving rail 5 so that between the seaside rail-laying brackets 4 may be connected on the seaside rail-laying brackets 4 is provided. Therefore, in the process of arranging a plurality of precast blocks 7 side by side on the upper precast receiving rail 5, the precast block 7 on the precast receiving rail 5 is slid to easily adjust the lateral installation position of the precast block 7. can do.

  Moreover, the construction method of the concrete structure which concerns on this embodiment is the process of arranging the several precast block 7 side by side, and is installing the precast block 7 on the upper precast receiving rail 5 away from the precast block 7 already arranged. Once temporarily placed, adjacent precast blocks 7 are joined together by sliding the precast blocks 7 and moving them sideways. In this case, a plurality of precast blocks 7 can be easily installed side by side.

  In the concrete structure construction method according to the present embodiment, the lower bracket 15 is attached to the side surface of the steel pipe 1. In this case, since the precast block 7 can be supported also by the lower bracket 15, the precast block 7 can be installed stably. Further, the lower bracket 15 can be used as a scaffold during construction of the concrete structure 10.

  Moreover, in the said construction method, the fitting convex part 13b is formed in one surface of the front surface and the back surface in the precast block 7, and the fitting recessed part 13c is formed in the other surface, and installs the several precast block 7 side by side. In this step, the fitting projections 13b and the fitting recesses 13c in the adjacent precast blocks 7 are fitted together to join the precast blocks 7 together. In this case, it is possible to ensure the water stoppage of the joint portion between the precast blocks 7.

  Moreover, the construction method of the concrete structure which concerns on this embodiment WHEREIN: Before installing the precast block 7, lower surface formwork 9b which blocks the space | interval part between the bottom parts 13a of the side wall part 11 in an adjacent precast block is lower-precast. It is attached to the receiving rail 17. In this case, since the precast block 7 can be supported by the lower surface mold 9b, the precast block 7 can be stably installed. Further, it is possible to reliably avoid leakage of the concrete in the subsequent concrete placing process.

  Further, in the concrete structure construction method according to the present embodiment, when the lower precast receiving rail 17 is placed on the horizontal member 15b, the height of each member in the lower precast receiving rail 17 is made common. In this case, since the lower formwork 9b can be mounted horizontally on the lower precast receiving rail 17, the precast block 7 can also be installed more reliably.

  In the above, it explained in detail based on the embodiment of the present invention. However, the present invention is not limited to the above embodiment.

  For example, in the above embodiment, the rail laying bracket 3 and the sea side rail laying bracket 4 are provided when the rail laying bracket 3 is attached to the plurality of steel pipes 1 and the rail laying bracket 3 is attached. The installation position of the precast block 7 was adjusted by setting the land side rail laying surface 3a and the sea side rail laying surface 4a to a common height, but the method for adjusting the installation position of the precast block 7 is limited to this. Absent. For example, the installation position of the precast block 7 can be adjusted by the method shown in FIG.

  FIG. 7 is a cross-sectional view showing a concrete structure 20 according to another embodiment. As shown in FIG. 7, when the steel pipe 1 is not driven perpendicularly to the sea bottom, a gap is generated between the steel pipe 1 and the vertical member 15a. For this reason, if the land side rail laying bracket 3, the sea side rail laying bracket 4, the upper precast receiving rail 5 and the precast block 7 are attached as they are, the precast block 7 is inclined. Then, installing the precast block 7 horizontally by providing the process of attaching the inclination adjusting material 22 for adjusting the inclination of the lower bracket 15 with respect to the steel pipe 1 between the steel pipe 1 and the vertical member 15a of the lower bracket 15. Can do. As the inclination adjusting member 22, a hardware can be suitably used.

  Moreover, in the said embodiment, although the precast block 7 had the fitting convex part 13b formed in the front surface of the precast block 7, and the fitting recessed part 13c was formed in the back surface of the precast block 7, an upper precast receiving rail If it can be mounted on 5 and moved laterally, it is not limited to this. For example, the fitting convex portion 13 b may be formed on the back surface of the precast block 7, and the fitting concave portion 13 c may be formed on the front surface of the precast block 7. Moreover, the fitting convex part 13b and the fitting recessed part 13c are not formed, but the front surface and the back surface of the precast block 7 may be flat.

  DESCRIPTION OF SYMBOLS 1 ... Steel pipe, 3 ... Land side rail laying bracket, 4 ... Sea side rail laying bracket, 3a ... Land side rail laying surface, 4a ... Land side rail laying surface, 5 ... Upper precast receiving rail, 7 ... Precast block, DESCRIPTION OF SYMBOLS 9 ... Formwork, 9a ... Side surface formwork, 9b ... Lower surface formwork, 10, 20 ... Concrete structure, 11 ... Side wall part, 15 ... Lower bracket, 17 ... Lower precast receiving rail, 12 ... Top end part, 13a ... Bottom part, 13b ... fitting convex part, 13c ... fitting concave part, 14 ... rail receiving part, 22 ... inclination adjusting material.

Claims (4)

Attaching a rail laying bracket to each of a plurality of foundation members, one of which is embedded in the bottom of the water and the other of which protrudes above the water surface;
Attaching an upper precast receiving rail to connect between the rail laying brackets on the rail laying brackets;
Arranging a plurality of precast blocks side by side on the upper precast receiving rail,
When attaching the rail laying bracket, the rail laying surface of the rail laying bracket has a common height,
The precast block includes a pair of opposing side wall portions, a top end portion that connects the side wall portions, a rail receiving portion that connects the side wall portions and receives the upper precast receiving rail,
Before the step of installing the precast block, further comprising a step of attaching a lower bracket to the base material, and a step of attaching a lower precast receiving rail on the lower bracket,
A method for constructing a concrete structure, wherein the plurality of precast blocks are arranged side by side, and a bottom portion of the precast block is placed on the lower precast receiving rail. Attaching a lower surface formwork to the gap between the bottom of the precast block and the base material;
The method for constructing a concrete structure according to claim 1 , further comprising: placing concrete inside the precast block. A fitting convex portion is formed on one surface of the front and back surfaces of the precast block, and a fitting concave portion is formed on the other surface,
In the step of arranging the plurality of precast blocks side by side, among the adjacent precast blocks, one of the fitting convex portions and the other fitting concave portion are fitted together to join the precast blocks together. The construction method of the concrete structure of Claim 1 or 2 . The construction of a concrete structure according to claim 1 , further comprising a step of attaching an inclination adjusting member for adjusting an inclination of the lower bracket with respect to the foundation member between the foundation member and the lower bracket. Method.

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