JP2017172192A - Concrete structure construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete structure construction method capable of improving construction efficiency by efficiently combinedly using a precast concrete member and cast-in-place concrete.SOLUTION: In a concrete structure construction method, a joining part block P constituted of a precast concrete member is installed by being supported by a support mechanism 20. Therefore, before forming a sidewall (a first wall part) 11, the joining part block P can be installed on the upper side than a first wall part forming space S11 for forming the sidewall 11. That is, the joining part block P constituted of the precast concrete member can be installed without waiting for a concrete cure period of the sidewall 11 constructed by cast-in-place concrete. Thus, construction efficiency can be improved by efficiently combinedly using the precast concrete member (the joining part block P) and the cast-in-place concrete.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a concrete structure construction method.

  Conventionally, as a technique in such a field, for example, a concrete structure construction method described in Patent Document 1 below is known. In this concrete structure construction method, a pair of side walls are erected from both side edges of the bottom slab and a top slab is joined to each top of the side slab to construct a reinforced concrete box culvert.

JP2013-234430A

  This type of concrete structure construction method may be performed by combining a precast concrete member and cast-in-place concrete. In such a case, the precast concrete member installed on the upper part of the lower frame constructed by cast-in-place concrete has been supported by the lower frame. Therefore, after casting the cast-in-place concrete, the precast concrete member is installed after waiting for the curing period, which causes a reduction in construction efficiency. On the other hand, a method is also known in which the entire concrete structure or most of the casing other than the uppermost part is a precast concrete member. However, for example, when precast concrete members become large, such as when building a large section box culvert, the size of the members and the increase in weight will exceed the transportable dimensions of the incoming vehicle and the capacity of existing lifting equipment. There was a problem such as. Moreover, in order to cope with such a problem, the equipment for carrying in, installation, etc. becomes large, and cost will increase.

  The present invention has been made to solve such problems, and provides a method for constructing a concrete structure capable of improving construction efficiency by efficiently using a precast concrete member and cast-in-place concrete together. With the goal.

  The concrete structure construction method according to the present invention includes a first wall portion extending in the vertical direction, a second wall portion extending in the vertical direction and facing the first wall portion, the first wall portion, and the second wall portion. A first slab portion located above between the wall portions, and a first joint portion that is installed on the first wall portion and connects the first wall portion and the first slab portion. A concrete structure construction method for constructing a concrete structure, wherein a joint block constituted by a precast concrete member is installed above a first wall portion forming space for forming a first wall portion. A joint portion forming step for forming the first joint portion, and a wall portion forming step for forming the first wall portion by placing concrete in the first wall portion forming space after the joint portion installing step, In the joint installation process, a support mechanism for supporting the joint block is provided. Upper To install the joint block from the first wall portion forming space by location.

  According to the concrete structure construction method according to the present invention, the joint block constituted by the precast concrete member is installed by being supported by the support mechanism. Therefore, before forming the first wall portion, the joint block can be installed on the first wall portion forming space for forming the first wall portion. That is, the precast concrete member can be installed without waiting for the concrete curing period of the first wall portion constructed by cast-in-place concrete. Therefore, the precast concrete member and cast-in-place concrete can be efficiently used together to improve the construction efficiency.

  In the concrete structure construction method according to the present invention, the concrete structure includes a second slab part positioned below the first wall part and the second wall part so as to face the first slab part, A second joint that is installed at a lower end position of the first wall and connects the first wall and the second slab part, and the support mechanism includes a first joint from the second joint. In the wall portion forming step, the first wall portion may be formed by embedding the long member and placing concrete in the wall portion forming step. With such a configuration, the support mechanism can be easily realized by a long member.

  In the concrete structure construction method according to the present invention, the long member may have an adjustment mechanism for adjusting the length. With such a configuration, the length of the long member can be easily adjusted.

  The concrete structure construction method according to the present invention is a plate installation process in which a plate-like member is installed on the side of the first wall portion forming space on the outer peripheral side of the concrete structure to be constructed before the joint installation process. The support mechanism may further include a bracket provided on the plate-like member and protruding into the first wall portion forming space. With such a configuration, the support mechanism can be easily realized by the bracket provided on the plate-like member.

  The method for constructing a concrete structure according to the present invention further includes a preparatory step for preparing a block installation device for installing the joint block before the joint installation step, and the block installation device is a first step of the concrete structure to be constructed. A shaft extending in the axial direction along the first wall portion, the second wall portion, and the first slab portion, and a gripping mechanism that is pivotally provided on the shaft and grips the joint block. The part installation process may include a gripping process of gripping the joint block by the gripping mechanism, and a rotational movement process of rotating the joint block held by the gripping mechanism by turning the gripping mechanism. Good. With such a configuration, the joint block can be installed using the block installation device, and the work efficiency can be further improved.

  In the concrete structure construction method according to the present invention, the block installation device may further include a propulsion jack that moves the block installation device in the axial direction. With such a configuration, the block installation device can be self-propelled by the propulsion jack. Therefore, it is possible to work by moving the block installation device easily.

  In the concrete structure construction method according to the present invention, the joint block has a wall connection surface for connection to the first wall portion and a slab connection surface for connection to the first slab portion. The wall connection surface may be formed to be inclined upward as it goes to the slab connection surface. With such a configuration, the center of gravity of the first joint formed by installing the joint block can be taken away from the slab connection surface. Therefore, the moment in the direction in which the joint block falls in the slab connection surface direction can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, a precast concrete member and cast-in-place concrete can be used together efficiently, and construction efficiency can be improved.

FIG. 1 is a perspective view showing an example of a concrete structure constructed by the concrete structure construction method according to the first embodiment. FIG. 2 is a cross-sectional view of the concrete structure shown in FIG. 1 in the circumferential direction. FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. 4A, 4B, and 4C are cross-sectional views illustrating a construction procedure of the concrete structure construction method according to the first embodiment. FIG. 5 is a side view showing a block installation device used in the concrete structure construction method according to the second embodiment. 6 is a cross-sectional view taken along line VI-VI shown in FIG. FIG. 7 is a diagram for explaining the operation of the block installation device shown in FIG. FIG. 8 is a side view showing main steps of the concrete structure construction method according to the second embodiment. FIG. 9 is a side view showing main steps of the concrete structure construction method according to the second embodiment. FIG. 10 is a side view showing main steps of the concrete structure construction method according to the second embodiment. FIG. 11 is a side view showing main steps of the concrete structure construction method according to the second embodiment. FIG. 12 is a side view showing main steps of the concrete structure construction method according to the second embodiment. 13 is a cross-sectional view taken along line XIII-XIII shown in FIG. 14 is a cross-sectional view taken along the line XIV-XIV shown in FIG. FIG. 15 is a side view showing main steps of the concrete structure construction method according to the third embodiment. FIG. 16 is a side view showing main steps of the concrete structure construction method according to the third embodiment. FIG. 17A is a cross-sectional view taken along line XVIIA-XVIIA shown in FIG. FIG. 17B is a cross-sectional view taken along line XVIIB-XVIIB shown in FIG. FIG. 18 is a perspective view showing a modification of the support mechanism. FIG. 19 is a perspective view showing a modified example of the support mechanism. FIG. 20 is a diagram illustrating a modification of the concrete structure.

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

[First Embodiment]
FIG. 1 is a perspective view showing an example of a concrete structure constructed by the concrete structure construction method according to the first embodiment. FIG. 2 is a cross-sectional view of the concrete structure shown in FIG. 1 in the circumferential direction. The concrete structure is, for example, a box culvert. A box culvert 1A shown in FIG. 1 and FIG. 2 is a box-like inner structure embedded in the ground, and is used as, for example, a subway, an underground passage, a cable duct, or the like. In the present embodiment, the concrete structure is not limited to the box culvert, and may be an underground structure having a wall structure such as an underground floor, an underground factory, and a sewage treatment plant.

  As shown in FIGS. 1 and 2, the box culvert 1A has a side wall (first wall portion) 11, a side wall (second wall portion) 12, a top plate (first plate) on four sides that are substantially rectangular in cross section. 1 slab portion) 13 and a bottom plate (second slab portion) 14. The box culvert 1 </ b> A includes corner joints 15, 16, 17, and 18 that connect the respective sides at four corners that are substantially rectangular in cross section. The length of the box culvert 1 </ b> A in the axial direction is, for example, about 10 m. The box culvert 1 </ b> A is separated from other box culverts 1 </ b> A whose end faces face each other in the box axial direction along the side wall 11, the side wall 12, and the top plate 13. It is extended by being connected.

  The side wall 11 and the side wall 12 extend in the vertical direction and face each other in the horizontal direction. The top plate 13 and the bottom plate 14 extend in the horizontal direction, respectively, and face each other in the vertical direction so as to cover the space SP formed by the side wall 11 and the side wall 12. The top plate 13 is positioned above the side wall 11 and the side wall 12, and the bottom plate 14 is positioned below between the side wall 11 and the side wall 12. The side wall 11, the side wall 12, the top plate 13, and the bottom plate 14 are each formed by placing concrete C on site.

  The corner joint (first joint) 15 is installed on the side wall 11 and connects the side wall 11 and the top plate 13. The corner joint 16 is installed on the side wall 12 and connects the side wall 12 and the top plate 13. The corner joint portion (second joint portion) 17 is installed at the lower end position of the side wall 11 and connects the side wall 11 and the bottom plate 14. The corner joint 18 is installed at the lower end position of the side wall 12 and connects the side wall 12 and the bottom plate 14. The corner joints 15, 16, 17, 18 are each formed by a joint block P made of a precast concrete member.

  The joint blocks P constituting the corner joints 15, 16, 17, and 18 are each formed in an L shape, and have a wall connection surface Pa and a slab connection surface Pb at the L-shaped end portions. Yes. Moreover, the junction block P has a hunch portion Pc at an L-shaped inner corner portion. The wall connection surface Pa of the joint block P is connected to the side wall 11 or the side wall 12 in the box culvert 1A. The slab connection surface Pb of the joint block P is connected to the top plate 13 or the bottom plate 14 in the box culvert 1A. Further, the wall connection surface Pa of the joint block P constituting the corner joints 15 and 16 is formed to be inclined upward toward the slab connection surface Pb. That is, the wall connection surface Pa of the joint block P of the corner joints 15 and 16 is formed to be inclined upward toward the space SP formed by the side wall 11 and the side wall 12 in the box culvert 1A.

  The box culvert 1 </ b> A further includes a support mechanism 20. The support mechanism 20 supports the joint block P when installing the joint block P in the construction of the box culvert 1A. The support mechanism 20 includes long support members (long members) 21, 22, 23, and 24 embedded in the side wall 11, the side wall 12, the top plate 13, and the bottom plate 14, respectively.

  The support member 21 is installed to extend in the vertical direction from the corner joint 17 to the corner joint 15, and when the joint block P is installed to form the corner joint 15, the joint block P is provided. Support. The support member 22 is installed so as to extend in the vertical direction from the corner joint 18 to the corner joint 16, and the joint block P is formed when the joint block P is installed to form the corner joint 16. Support. The support member 23 is installed so as to extend in the horizontal direction from the corner joint 15 to the corner joint 16, and when the joint block P is installed to form the corner joints 15 and 16, the horizontal position is set. Hold. The support member 24 is installed extending horizontally from the corner joint 17 to the corner joint 18, and when the joint block P is installed to form the corner joints 17 and 18, Hold the horizontal position.

  The support members 21, 22, 23, and 24 are installed in a plurality (for example, five) at intervals (for example, every 2 m) in the box axis direction. However, the quantity and interval of the support members 21, 22, 23, 24 in the box axis direction are not limited to this. Alternatively, the support members 21, 22, 23, and 24 may be one each. Specifically, the numbers and intervals of the support members 21, 22, 23, and 24 may be appropriately determined according to the joint block P to be supported.

  The configuration of the support member 21 will be described with reference to FIG. FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. Here, the support member 21 will be described as a representative, but the support members 22, 23, and 24 have the same configuration.

  The support member 21 includes a first support member 21a and a second support member 21b. The first support member 21 a is formed in an elongated shape, and constitutes an upper portion from the approximate center of the support member 21. The second support member 21 b is formed in a long shape, and configures the lower part from the approximate center of the support member 21. The support member 21 is formed by vertically connecting a first support member 21a and a second support member 21b. The first support member 21a and the second support member 21b are formed in a cone shape that tapers at a connection point. The support member 21 has a joint portion (adjustment mechanism) 30 that connects the first support member 21a and the second support member 21b and adjusts the length. The joint unit 30 includes a socket 31, a flat jack 32, and a fixing member 33.

  The socket 31 is constituted by a cylindrical member made of an elastic body (for example, rubber). Therefore, it is possible to suppress the displacement of the support member 21 without providing a diagonal member. The socket 31 divides the cylindrical member in the axial direction, and joins the divided surfaces so as to be cylindrical again with the first support member 21a and the second support member 21b sandwiched therebetween. 21a and the 2nd support member 21b are connected. Further, the socket 31 is configured by further dividing the cylindrical member into upper and lower parts and reconnecting them through the flat jack 32.

  The flat jack 32 extends and contracts the socket 31 in the vertical direction. The joint part 30 adjusts the connection position of the first support member 21 a and the second support member 21 b by expansion and contraction of the socket 31 by the flat jack 32. The joint part 30 adjusts the length of the support member 21 by adjusting the connection position of the first support member 21a and the second support member 21b. Then, the fixing material 33 is filled in the cavity of the socket 31 at the position where the support member 21 is adjusted to a desired length.

  The fixing member 33 is made of a hydraulic material, and after the cavity of the socket 31 is filled, the fixing member 33 is cured in the cavity to fix the position of the socket 31. As the fixing material 33, for example, a highly versatile material such as mortar can be used. Alternatively, when it is desired to harden earlier, early-strength Portland cement or ultra-early-strength Portland cement may be employed. Further, a curable resin or the like can be used as the fixing material 33. In this case, it can be hardened earlier.

  A concrete structure construction method for constructing the box culvert 1A will be described. The concrete structure construction method includes a lower block installation process, a bottom plate formation process, an upper block installation process, a side wall formation process, and a top plate formation process. FIGS. 4A to 4C are cross-sectional views illustrating the construction procedure of the concrete structure construction method according to the first embodiment. In the first embodiment, as an example, the box culvert 1A is constructed in the following order, but the order is not limited.

  In the description of the concrete structure construction method, the first wall portion forming space S11 indicates a planned construction position of the side wall 11 in the box culvert 1A. That is, the first wall portion forming space S11 is an internal space surrounded by the mold when the concrete is placed on the side wall 11 when the mold is placed. Then, the side wall 11 is formed by placing concrete C in the internal space surrounded by the mold. Similarly, the second wall portion forming space S12, the first slab portion forming space S13, and the second slab portion forming space S14 are the planned construction positions of the side wall 12, the top plate 13, and the bottom plate 14 in the box culvert 1A. Indicates.

(Lower block installation process)
As shown in FIG. 4A, the corner joints 17 and 18 are formed by installing joint blocks P on both sides of the second slab portion forming space S14. The joint block P is installed such that the horizontally formed wall connection surface Pa faces upward and the slab connection surfaces Pb face each other. Then, the support member 24 is installed between the corner joint portions 17 and 18. The support member 24 is installed by forming insertion holes in the slab connection surface Pb of the joint block P in advance and inserting the end portions of the support member 24 into the respective insertion holes of the corner joint portions 17 and 18. It can be carried out. Further, the support member 24 is adjusted to an appropriate length by the joint portion 30 and installed. For example, the length is adjusted so that the joint block P of the corner joints 17 and 18 is stretched and supported by the support member 24.

(Bottom plate forming process)
Reinforcing bars are placed in the second slab part forming space S14 between the corner joints 17 and 18, and the formwork is installed (the illustration of the reinforcing bars and formwork is omitted. The following steps are also the same). . And concrete C is laid in 2nd slab part formation space S14. Here, the bottom plate 14 is formed by embedding the support member 24 and placing the concrete C therein. Thereafter, when the curing period of the concrete C placed in the second slab part forming space S14 has elapsed, the formation of the bottom plate 14 is completed.

(Upper block installation process)
As shown in FIG.4 (b), the junction block P is installed above the 1st wall part formation space S11 for forming the side wall 11, and the corner junction part 15 is formed (joint installation process). . Similarly, the joint block P is installed above the second wall forming space S12 to form the corner joint 16. The joint block P is installed such that the inclined wall connection surface Pa faces downward and the slab connection surfaces Pb face each other. In this step, the first wall portion forming space S11 and the second wall portion forming space S12 are in a state where the concrete C has not yet been placed. Here, by installing the support members 21, 22, and 23 that support the joint block P, the joint block P is located above the first wall portion forming space S11 or above the second wall portion forming space S12. Is installed. In addition, the support members 21, 22, and 23 are adjusted to an appropriate length by the joint portion 30 and installed. For example, the weights of the corner joints 15 and 16 are vertically supported by the support members 21 and 22, and the joint block P of the corner joints 15 and 16 is stretched and supported by the support member 23.

  The support members 21 and 22 may be installed at the time when the joint block P is installed and the corner joints 17 and 18 are formed. The support members 21 and 22 are made of the concrete C placed in the second slab part forming space S14. You may install using the scaffold for forming the side wall 11, the side wall 12, and the top plate 13 mentioned later after curing. For example, in the installation of the support member 21, the second support member 21b is installed at the time of forming the corner joints 17 and 18, and the first support member 21a is attached to the second support member 21b using the scaffold after the scaffold is installed. May be connected and installed by the joint part 30. In addition, the support member 23 may be installed before the joint block P is installed, or may be installed when the joint block P is installed.

(Side wall forming process and top plate forming process)
As shown in FIG.4 (c), the side wall 11 is formed after a junction part installation process (1st wall part formation process). Specifically, after curing of the concrete C placed in the second slab part forming space S14, a scaffold for forming a side wall and a top plate is installed on the bottom plate 14. Reinforcing bars are placed in the first wall portion forming space S11, the second wall portion forming space S12, and the first slab portion forming space S13, respectively, and a formwork is installed. Here, the side wall 11 is formed by embedding the support member 21 in the first wall portion forming space S11 and placing the concrete C after the joining portion installation step. Moreover, the opening of a mold is provided in the space SP side upper end in 1st wall part formation space S11, and concrete C is laid from the said opening in 1st wall part formation space S11. Similarly, the side wall 12 and the top plate 13 are formed. In the formation of the side wall 12, concrete C is placed in the second wall portion forming space S12 from the opening of the mold provided at the upper end on the space SP side in the second wall portion forming space S12. Thereafter, when the curing period of the concrete C placed in each space has elapsed, the formation of the side wall 11, the side wall 12, and the top plate 13 is completed.

  The side wall 11, the side wall 12, and the top plate 13 may be formed sequentially or in parallel. In the case of performing sequentially, for example, a scaffold for forming the side wall 11 and the side wall 12 is installed, and reinforcement is placed in the first wall forming space S11 and the second wall forming space S12. Perform placement. After that, a scaffold for forming the top plate 13 is installed on the bottom plate 14, and bar arrangement, formwork installation, placement of concrete C, etc. are performed in the first slab part forming space S13 for forming the top plate. Do. When the side wall 11, the side wall 12, and the top plate 13 are formed in parallel, for example, a dual-purpose scaffolding is installed on the bottom plate 14, and the first wall portion forming space S11 and the second wall portion forming space S12 are provided. , And the first slab portion forming space S13 are arranged in parallel and the frame is placed in parallel, and then the first wall portion forming space S11, the second wall portion forming space S12, and the first slab portion forming. Placing the concrete C in the space S13 is performed in parallel.

  The joint block P that constitutes the corner joints 15, 16, 17, and 18 may be installed from above at each position, for example, by a crane or the like, and the space SP side of the box culvert 1A using another device. You may install from. The method of installing from above is particularly suitable when building the box culvert 1A in the underground space formed by the open-cut method. Moreover, the method of installing from the space SP side is particularly suitable for constructing the box culvert 1A between the ground hollows formed by the non-open cutting method.

  Actions and effects of the concrete structure construction method according to the first embodiment will be described.

  According to the concrete structure construction method according to the present embodiment, the joint block P constituted by the precast concrete member is installed by being supported by the support mechanism 20. Therefore, before the side wall 11 is formed, the joint block P can be installed above the first wall portion forming space S11 for forming the side wall 11. That is, it becomes possible to install the joint block P constituted by the precast concrete member without waiting for the curing period of the concrete C on the side wall 11 constructed by cast-in-place concrete. Therefore, the precast concrete member (joint block P) and cast-in-place concrete (concrete C) can be used together efficiently to improve the construction efficiency. In addition, for example, a joint location such as a corner joint 15 that connects the side wall 11 and the top plate 13 often has a complicated bar arrangement structure. Therefore, the bar arrangement accuracy can be improved by configuring the joint block P corresponding to such a joint location with precast concrete.

  In the concrete structure construction method according to the present embodiment, the box culvert 1 </ b> A is installed at the bottom plate 14 positioned below the side wall 11 and the side wall 12 so as to face the top plate 13, and at the lower end position of the side wall 11. And a corner joint 17 that connects the bottom plate 14 to each other, and the support mechanism 20 includes a support member 21 that is installed from the corner joint 17 to the corner joint 15 to form a wall portion. Then, the side wall 11 is formed by embedding the support member 21 and placing concrete C therein. With such a configuration, the support mechanism 20 can be easily realized by the support member 21.

  In the concrete structure construction method according to the present embodiment, the support member 21 has a joint portion 30 for adjusting the length. With such a configuration, the length of the support member 21 can be easily adjusted.

  In the concrete structure construction method according to the present embodiment, the joint block P of the corner joint 15 and the corner joint 16 includes a wall connection surface Pa connected to the side wall 11 and a slab connected to the top plate 13. The wall connection surface Pa is formed so as to be inclined upward toward the slab connection surface Pb. With such a configuration, the center of gravity of the corner joint 15 formed by installing the joint block P can be taken away from the slab connection surface Pb. Therefore, the moment in the direction in which the joint block P falls in the slab connection surface Pb direction can be suppressed. In forming the side wall 11, the concrete C is placed in the first wall portion forming space S <b> 11 from the opening of the mold formed at the upper end on the space SP side formed by the side wall 11 and the side wall 12. Therefore, an air escape path is formed at a position where the wall connection surface Pa is inclined upward, and the quality of the side wall 11 and the side wall 12 formed by the concrete C is improved.

[Second Embodiment]
A second embodiment will be described. The concrete structure construction method according to the second embodiment includes a preparation step of preparing the block installation device 40 before the lower block installation step and the upper block installation step, and an upper block installation before the bottom plate forming step. It differs from the concrete structure construction method according to the first embodiment in that the process is performed. That is, in the concrete structure construction method according to the second embodiment, the corner joints 15, 16, 17, and 18 are formed first. Further, the joint block P is installed using the block installation device 40. Details of the differences will be described below.

  FIG. 5 is a side view showing a block installation device used in the concrete structure construction method according to the second embodiment. 6 is a cross-sectional view taken along line VI-VI shown in FIG. As shown in FIGS. 5 and 6, the block installation device 40 includes a rectangular tube body 41, a bracket 42, a shaft 44, a turning drive unit 45, a gripping mechanism 46, a hanging portion 47, and a propulsion jack 48. It is equipped with.

  As shown in FIG. 6, the rectangular tube body 41 includes plate-like side walls (plate-like members) 41a and 41b, an upper wall 41c, and a bottom wall 41d. The side wall 41a, the side wall 41b, the upper wall 41c, and the bottom wall 41d are respectively a first wall forming space S11 and a second wall forming space S12 on the outer peripheral side of the box culvert 1A to be constructed. The first slab part forming space S13 and the second slab part forming space S14 are provided so as to be disposed laterally. Further, the end portions of the side wall 41a and the upper wall 41c, the side wall 41a and the bottom wall 41d, the side wall 41b and the upper wall 41c, and the side wall 41b and the bottom wall 41d are connected to each other. That is, the rectangular cylinder 41 is formed so as to cover the space in which the box culvert 1A is constructed. Further, as shown in FIG. 5, the rectangular tube body 41 is provided at a position intersecting the side wall 41a, the side wall 41b, the upper wall 41c, and the bottom wall 41d on the side where the box culvert 1A is extended, A front wall 41e that connects the side wall 41a, the side wall 41b, the upper wall 41c, and the bottom wall 41d is provided.

  As shown in FIG. 6, the bracket 42 supports the joint block P when installing the joint block P in the construction of the box culvert 1A. That is, the support mechanism 20 includes the bracket 42 in the second embodiment. The bracket 42 is provided on each of the side walls 41 a and 41 b on the inner peripheral surface of the rectangular tube body 41. The bracket 42 provided on the side wall 41a protrudes from the side wall 41a to the upper end portion of the first wall forming space S11. The bracket 42 provided on the side wall 41b protrudes from the side wall 41b to the upper end portion of the second wall forming space S12.

  As shown in FIG. 5, a plurality (for example, five) of the brackets 42 are provided at intervals (for example, 2 m each) in the box axis direction. However, the quantity and interval of the brackets 42 in the box axis direction are not limited to this. Alternatively, one bracket 42 may be provided. Specifically, the number and interval of the brackets 42 may be appropriately determined according to the joint block P to be supported.

  In this way, in the second embodiment, by installing the bracket 42, the joint block P is installed above the first wall forming space S11 or above the second wall forming space S12. The support members 21, 22, 23, and 24 are installed after the joint block P is installed. The bracket 42 is provided on the side walls 41a and 41b so as to be axially rotatable by hinge joining or the like, so that the support members 21 and 22 can be easily attached even if the support members 21 and 22 are installed after the joint block P is installed. Can be avoided.

  The shaft 44 and the turning drive unit 45 turn the gripping mechanism 46. As shown in FIG. 5, the shaft 44 is provided on the front wall 41 e of the rectangular tube body 41 via the turning drive unit 45. The shaft 44 is connected to the turning drive unit 45 at the base end, and extends in the slide direction D <b> 1 about the center of the rectangular tube body 41 in the box circumferential direction. In the present embodiment, the slide direction D1 is a direction that coincides with the box axis direction.

  The shaft 44 is provided with a ring portion R. A plurality of (for example, two) ring portions R are provided on the distal end side in the axial direction of the shaft 44. As shown in FIG. 6, the ring portion R is formed in an annular shape along the outer peripheral surface of the shaft 44. Further, the ring portion R is provided so as to be rotatable in the rotation direction RD about the axis of the shaft 44. The ring part R is connected to the turning drive part 45 via a drive force transmission mechanism (not shown). The ring part R is driven by the turning drive part 45 and rotates in the rotation direction RD. The gripping mechanism 46 is provided on the outer peripheral surface of the ring portion R. The shaft 44 and the turning drive unit 45 turn the gripping mechanism 46 by rotating the ring part R in the rotation direction RD.

  Further, inside the shaft 44, there are provided a slide hole 44h and a slit 44s through which a later-described hanging portion 47 can slide. As shown in FIG. 6, the slide hole 44 h is provided at a substantially central portion in the shaft 44. The slit 44 s is formed to extend from the slide hole 44 h to the outer side in the radial direction of the shaft 44, and is provided to penetrate from the slide hole 44 h to the outer peripheral surface of the shaft 44. In the present embodiment, the slit 44s is formed to extend downward from the slide hole 44h. Further, as shown in FIG. 5, the slide hole 44h and the slit 44s are continuously formed over the entire length of the shaft 44 in the slide direction D1. Note that the length of the slide hole 44h and the slit 44s may be set to a length corresponding to the distance by which the suspended portion 47 is slid and moved in the slide direction D1, and may be formed shorter than the entire length of the shaft 44.

  A slit Rs is provided in the ring portion R of the shaft 44. As shown in FIG. 5, the slit Rs of the ring portion R is provided in the entire length of the ring portion R in the sliding direction D1. Further, as shown in FIG. 6, the slit Rs extends from the slit 44 s of the shaft 44 to the outside in the radial direction of the shaft 44, and is provided so as to penetrate from the inner peripheral surface to the outer peripheral surface of the ring portion R. . Accordingly, the slide hole 44h inside the shaft 44 is continuously open downward through the entire length of the shaft 44 in the slide direction D1 through the slit 44s and the slit Rs.

  Here, as described above, the ring portion R rotates in the rotation direction RD. FIG. 7 is a diagram for explaining the operation of the block installation device shown in FIG. For example, the ring portion R shown in FIG. 7 is in a state of being rotated about ¼ counterclockwise in the rotation direction RD from the state shown in FIG. In FIG. 7, the slit Rs of the ring portion R is in a state facing the side wall 41a side. That is, the slit Rs of the ring portion R is in a state of facing sideways. Accordingly, the slide hole 44h of the shaft 44 is closed by the ring portion R on the lower side.

  The gripping mechanism 46 grips and rotates the joint block P. As shown in FIG. 6, the gripping mechanism 46 is provided on the outer peripheral surface of the ring portion R at a position spaced apart from the slit Rs in the rotation direction RD of the ring portion R. For example, the gripping mechanism 46 is provided on the outer peripheral surface of the ring portion R at a position rotated about ¼ from the slit Rs clockwise in the drawing. In other words, the gripping mechanism 46 is provided at a distance from the slit Rs so that the center angle between the gripping mechanism 46 and the slit Rs is substantially a right angle with the axis of the shaft 44 as the center.

  The gripping mechanism 46 includes an arm 46a and a gripping portion 46b. As shown in FIG. 6, the gripping mechanism 46 is fixed to the ring portion R at the base end of the arm 46a. The gripping mechanism 46 grips the joint block P by the gripping portion 46b. The grip portion 46b is provided at the tip of the arm 46a, and turns around the axis of the shaft 44 in the rotation direction RD via the arm 46a fixed to the ring portion R. The arm 46a is configured to be extendable and contractable by, for example, a telescopic mechanism. The gripping portion 46b can move the joint block P to any position between the shaft 44 and the inner peripheral surface of the rectangular tube body 41 by the expansion and contraction of the arm 46a. For example, a known gripping device such as various grippers may be used as the gripping portion 46b.

  The hanging part 47 suspends and supports the joint block P until the grasping mechanism 46 grasps it. As shown in FIG. 5, the suspended portion 47 includes a support body 47a and a suspended material 47b. The support body 47a is installed at the tip of the shaft 44 and is configured by a cylindrical body extending in the slide direction D1. The support body 47a slides in the slide direction D1 through the slide hole 44h inside the shaft 44. A plurality of (for example, three) suspension members 47b are provided below the support body 47a. The suspension member 47b is fixed to the support body 47a and extends downward from the support body 47a.

  As shown in FIGS. 5 and 6, the suspension member 47 b slides the slit 44 s of the shaft 44 and the slit Rs of the ring portion R in the sliding direction in a state where the slide hole 44 h of the shaft 44 is continuously opened downward. Slide to D1. Further, the suspension member 47b is prevented from sliding in the sliding direction D1 in a state where the slide hole 44h of the shaft 44 is closed by the ring portion R (see FIG. 7). Therefore, the suspended portion 47 can slide within the shaft 44 when the slide hole 44h of the shaft 44 is continuously open downward. Note that the state in which the slide hole 44h of the shaft 44 is continuously open downward is the same as the state in which the slit Rs of the ring portion R faces downward, as shown in FIG.

  For example, various grippers or the like may be employed as the hanging material 47b. Or the structure which employ | adopts a wire rope etc. as the suspending material 47b, and hangs and supports the junction block P may be sufficient. The hanging portion 47 can be adopted as long as it includes a hanging material 47b that can slide the slit 44s of the shaft 44 and the slit Rs of the ring portion R. Alternatively, the suspension block 47 may not be provided, and the joint block P may be suspended and supported by the gripping mechanism 46 and moved.

  The propulsion jack 48 moves the block installation device 40 in the box axis direction. The propulsion jacks 48 are provided at the four corners of the front wall 41e of the rectangular tube body 41, respectively. Therefore, the propulsion jack 48 can be installed between the front wall 41e and the end face of the joint block P that is installed in advance. The block installation device 40 moves to the side where the box culvert 1A is extended in the box axial direction by an operation in which the propulsion jack 48 pushes the joint block P that has been installed in advance. That is, the block installation device 40 is configured to be capable of self-propelled by the propulsion jack 48.

  The operation of the gripping mechanism 46 and the hanging portion 47 will be described with reference to FIGS. FIGS. 8-12 is sectional drawing which shows the main processes of the concrete structure construction method which concerns on 2nd Embodiment. The suspending portion 47 suspends the joint block P carried by the carriage 49 by the suspending material 47b (see FIG. 8). In the state where the slide hole 44h of the shaft 44 is continuously opened downward, the suspension portion 47 slides in the slide direction D1 and conveys the joint block P to the position of the gripping mechanism 46 (FIG. 9). reference). The gripping mechanism 46 is turned downward when the ring portion R rotates in the rotation direction RD, and the joint block P suspended and supported by the suspension material 47 b is gripped by the gripping portion 46 b and received from the suspension portion 47. Change (see FIG. 10). Thereafter, the ring portion R rotates in the rotation direction RD, and the slit Rs of the ring portion R is in a state of facing downward (see FIG. 11). In this state, the hanging portion 47 returns to the original position by sliding in the sliding direction D1. Then, when the ring portion R further rotates in the rotation direction RD, the gripping mechanism 46 is turned, and the joint block P gripped by the gripping portion 46b is installed (see FIG. 12).

  A method of installing the joint block P using the block installation device 40 (block installation method) will be described. As mentioned above, FIGS. 8-12 is sectional drawing which shows the main processes of the concrete structure construction method which concerns on 2nd Embodiment. FIG. 13 is a cross-sectional view taken along line XIII-XIII shown in FIG. 14 is a cross-sectional view taken along the line XIV-XIV shown in FIG. In addition, here, the case where the process (joint part installation process) which installs the junction block P above the 1st wall part formation space S11 for forming the side wall 11 and forms the corner joint part 15 is included is included. Although representatively described, the corner joints 16, 17, and 18 are formed in the same manner. The block installation method includes a plate installation process, a suspension support process, a first slide process, a gripping process, a second slide process, and a rotational movement process.

(Plate installation process)
As shown in FIG. 8, the side wall 41a of the rectangular tube body 41 of the block installation device 40 is arranged on the entire side surface of the first wall forming space S11 on the outer peripheral side of the box culvert 1A to be constructed. Next, the block installation device 40 is moved. The block installation device 40 moves to the side where the box culvert 1 </ b> A is extended in the box axial direction by the operation of pushing out the propulsion jack 48 described above. And the bracket 42 provided in the side wall 41a is protruded in 1st wall part formation space S11.

(Hanging support process)
As shown in FIGS. 8 and 13, the joint block P transported by the carriage 49 in the rectangular tube body 41 of the block installation device 40 is lifted by the suspension material 47 b of the suspension portion 47. Here, the slide hole 44h of the shaft 44 is continuously open downward. As shown in FIG. 9, the suspended portion 47 is slid in the sliding direction D1 to enter the shaft 44 (first sliding step). Then, the joint block P is moved to the position of the gripping mechanism 46 by the sliding movement of the hanging portion 47.

(Gripping process)
Subsequently, as shown in FIG. 10, the ring portion R is rotated and the gripping mechanism 46 is directed downward. Then, by holding the joint block P by the gripping portion 46b of the gripping mechanism 46, the joint block P is received from the suspended portion 47 (P1 indicated by a two-dot chain line in FIG. 14). Thereafter, as shown in FIG. 11, the ring portion R is rotated so that the slide hole 44h of the shaft 44 is continuously open downward. Then, the hanging portion 47 is slid in the sliding direction D1 to be retracted from the shaft 44 and returned to the original position (second sliding step).

(Rotational movement process)
As shown in FIGS. 12 and 14, the joint block P held by the gripping mechanism 46 is rotated by rotating the gripping mechanism 46. Specifically, the ring portion R is further rotated in the rotation direction RD to turn the gripping mechanism 46 so that the planned construction position of the corner joint 15 is on the extension line in the extending direction of the gripping mechanism 46. The block P is rotationally moved (P2 indicated by a two-dot chain line in FIG. 14). And the arm 46a of the holding | grip mechanism 46 is extended, the junction part block P is installed above 1st wall part formation space S11, and the corner junction part 15 is formed (joint part installation process). In this step, the first wall portion forming space S11 is in a state where the concrete C has not yet been placed. Here, the joint block P is installed above the first wall forming space S11 by installing the bracket 42 that supports the joint block P.

  Actions and effects of the concrete structure construction method according to the second embodiment will be described.

  In the concrete structure building method according to the present embodiment, the side portion of the rectangular tube body 41 on the side of the first wall portion forming space S11 on the outer peripheral side of the box culvert 1A to be built before the joining portion installation step. The support mechanism 20 further includes a bracket 42 that is provided on the side wall 41a and protrudes into the first wall portion forming space S11. With such a configuration, the support mechanism 20 can be realized relatively easily by the bracket 42 provided on the side wall 41a.

  The concrete structure construction method according to the present embodiment further includes a preparation step of preparing a block installation device 40 for installing the joint block P before the joint installation step, and the block installation device 40 is a box to be constructed. A shaft 44 extending in the axial direction along the side wall 11, the side wall 12, and the top plate 13 of the culvert 1 </ b> A; and a gripping mechanism 46 that is pivotally provided on the shaft 44 and grips the joint block P. The part installation process includes a gripping process of gripping the joint block P by the gripping mechanism 46, a rotational movement process of rotating and moving the joint block P held by the gripping mechanism 46 by turning the gripping mechanism 46, and Is included. With such a configuration, the joint block P can be installed using the block installation device 40, and the work efficiency can be further improved.

  In the concrete structure construction method according to the present embodiment, the block installation device 40 further includes a propulsion jack 48 that moves the block installation device 40 in the box axial direction. With this configuration, the block installation device 40 can be self-propelled by the propulsion jack 48. Therefore, the block installation device 40 can be easily moved and operated.

  In the concrete structure construction method according to the present embodiment, the joint block P of the corner joint 15 and the corner joint 16 includes a wall connection surface Pa connected to the side wall 11 and a slab connected to the top plate 13. The wall connection surface Pa is formed so as to be inclined upward toward the slab connection surface Pb. With such a configuration, the center of gravity of the corner joint 15 formed by installing the joint block P can be taken away from the slab connection surface Pb. The moment in the direction in which the joint block P falls in the direction of the slab connection surface Pb can be suppressed. In particular, since the side wall 41a of the rectangular tube body 41 is installed on the outer peripheral side of the constructed box culvert 1A, the stability when the joint block P is installed is improved.

[Third Embodiment]
A third embodiment will be described. In the concrete structure construction method according to the third embodiment, the block installation device 40 is not provided with the gripping mechanism 46, and the gantry support process, the lateral movement process, and the lifting weight instead of the gripping process and the rotational movement process. It differs from the concrete structure construction method according to the second embodiment in that it includes a process. Details of the differences will be described below.

  FIG.15 and FIG.16 is sectional drawing which shows the main processes of the concrete structure construction method which concerns on 3rd Embodiment. FIG. 17A is a cross-sectional view taken along line XVIIA-XVIIA shown in FIG. FIG. 17B is a cross-sectional view taken along line XVIIB-XVIIB shown in FIG. As shown in FIG. 15, the block installation device 40 includes a slide transport mechanism 61, a support frame 62, and a lifting mechanism 63.

  As shown in FIG. 15, the slide transport mechanism 61 is placed below the shaft 44 on the bottom wall 41d of the rectangular tube body 41 of the block installation device 40, and moves laterally toward the side wall 41a. The support frame 62 is placed on the slide transport mechanism 61.

  The support frame 62 supports the joint block P from below so as to have the same posture as when installed at the planned construction position. The joint block P suspended and supported by the hanging part 47 is transferred from the hanging part 47 to the support frame 62 by being placed on the support frame 62 on the slide transport mechanism 61. The support frame 62 supports the joint block P so as to have the same posture as the joint block P at the planned construction position of the corner joint 15. The support frame 62 includes, for example, a box member 62a that covers the entire side surface of the joint block P, and a support member 62b that supports two lower surfaces having different heights of the joint block P from below. The support frame 62 is not limited to the above. The support frame 62 can be adopted as long as it supports two or more locations on the lower surface of the joint block P from below.

  The slide transport mechanism 61 moves the joint block P placed on the support frame 62 in the lateral direction. The slide transport mechanism 61 moves in the lateral direction from below the shaft 44 toward the side wall 41a in a state where the joint block P is placed. That is, the slide transport mechanism 61 moves the joint block P to below the planned construction position of the corner joint 15. For the slide conveyance mechanism 61, for example, a known conveyance device such as a carriage or an air caster may be adopted.

  The lifting mechanism 63 lifts the joint block P that has moved to a position below the planned construction position of the corner joint 15 to the planned construction position of the corner joint 15. The lifting mechanism 63 is constituted by a jack. The joint block P is transferred from the slide transport mechanism 61 to the lifting mechanism 63 by sliding the lifting mechanism 63 under the slide transport mechanism 61 below the planned construction position of the corner joint 15. The joint block P is transferred from the slide transport mechanism 61 to the lifting mechanism 63 while being supported by the support frame 62. After the joint block P is replaced, the slide transport mechanism 61 is removed from under the lifting mechanism 63.

  The lifting mechanism 63 lifts the support base 62 to lift the joint block P supported by the support base 62 to the planned construction position of the corner joint 15. The lifting mechanism 63 lifts by jacking up. Further, as shown in FIGS. 16 and 17, even when jacking up, the temporary support member 64 is inserted below the support frame 62, and the temporary support member 64 is piled up along with the jack-up to lift the weight. Good. By installing the receiving seat 65 on the temporary receiving member 64 and changing the receiving seat 65 to the upper temporary receiving member 64 for each scroll end of the lifting mechanism (jack) 63, the lifting mechanism 63 is moved upward. Also good.

  What is necessary is just to implement the plate installation process and suspension support process of the block installation method in 3rd Embodiment similarly to 2nd Embodiment. In the third embodiment, after the suspension support step, a step of supporting the joint block P from below so as to have the same posture as that when it is installed at the planned construction position by the support base 62 (base support step). This is performed (P3 indicated by a two-dot chain line in FIG. 15). In this state, the joint block P is moved in the lateral direction by the slide transport mechanism 61 (lateral movement process). The slide transport mechanism 61 moves the joint block P to below the planned construction position of the corner joint 15 (P4 shown in FIG. 15). After that, the lifting mechanism 63 lifts the joint block P to the planned construction position of the corner joint 15 (lifting process). Then, at the planned construction position of the corner joint 15, the joint block P is placed above the first wall portion formation space S <b> 11 by installing the bracket 42 as in the second embodiment (FIG. 5). reference).

  The lifting process can be applied in the same manner when the corner block 16 is formed by installing the joint block P. The corner joints 17 and 18 can be formed by omitting the lifting process and installing the corner joints 17 and 18 at the planned construction positions of the corner joints 17 and 18 by the gantry support process and the lateral movement process.

  Actions and effects of the concrete structure construction method according to the third embodiment will be described.

  In the concrete structure construction method according to the present embodiment, the block installation device 40 includes a slide transport mechanism 61, a support frame 62, and a lifting mechanism 63, and the joint installation process is scheduled to be performed by the support frame 62. A gantry support step for supporting the joint block P from below so as to have the same posture as when installed at the position, a lateral movement step for moving the joint block P in the lateral direction by the slide transport mechanism 61, A lifting step of lifting the joint block P by the lifting mechanism 63. With such a configuration, the joint block P can be easily moved in the lateral direction or the upward direction. Therefore, the joint block P can be installed in a stable state. For example, it is particularly suitable when the weight of the joint block P is large, such as when the length of the joint block P in the box axis direction is large.

  Although a preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment.

  18 and 19 are perspective views showing modifications of the support mechanism 20. A support mechanism 20 shown in FIG. 18 includes a long support member (long member) 25. The support member 25 has a telescopic mechanism. As described above, the support member 25 may be configured to adjust the length by a telescopic mechanism.

  As illustrated in FIG. 19, the support mechanism 20 may include a reinforcing bar assembly 27 configured by assembling a reinforcing bar 26. Further, a brace 28 for reinforcing the reinforcing bar assembly 27 may be further provided. The reinforcing bar assembly 27 may be transported in a state where the pre-assembled reinforcing bar 26 is folded, and may be restored and installed when the support mechanism 20 is installed. The reinforcing bar assembly 27 may be formed in a three-dimensional shape or a flat shape.

  In the box culvert 1A of the above-described embodiment, the corner joint 17 installed at the lower end position of the side wall 11 and the corner joint 18 installed at the lower end position of the side wall 12 are each constituted by a precast concrete member. However, the corner joint 17 and the corner joint 18 may be made of cast-in-place concrete. The box culvert may be configured by integrally forming the corner joint portion 17, the corner joint portion 18, and the bottom slab 14 with cast-in-place concrete.

  The box culvert is not limited to the box culvert 1A. FIG. 20 is a diagram illustrating a modified example of the box culvert. A box culvert 1B shown in FIG. 20 further includes an intermediate wall (first wall portion) 51, an intermediate joint portion (first joint portion) 52, and an intermediate joint portion 52. The middle wall 51 extends vertically and is provided between the side wall 11 and the side wall 12 substantially in parallel with the side wall 11 and the side wall 12. The intermediate joint 52 connects the middle wall 51 and the top plate 13, and the middle joint 53 connects the middle wall 51 and the bottom plate 14. In the box culvert 1B, the inner wall 51 is formed of cast-in-place concrete, and the intermediate joints 52, 52 are formed of a joint block P made of a precast concrete member. Even when constructing such a box culvert 1B, the intermediate joint 52 can be formed by installing the joint block P above the space for forming the middle wall 51.

  The box culvert may be a two-story box culvert obtained by connecting the box culvert 1A or the box culvert 1B in the vertical direction. In this case, for example, when installing the joint block P, the block installation device 40 can be particularly suitably applied.

  The preferred embodiments and modifications according to the present invention have been described above, but the present invention is not limited to the above-described embodiments and modifications. The present invention can be variously modified and changed using techniques applicable to those skilled in the art within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Box culvert, 11 ... Side wall (1st wall part), 12 ... Side wall (2nd wall part), 13 ... Top plate (1st slab part), 14 ... Bottom plate (2nd slab part) ), 15... Corner joint (first joint), 17. Corner joint (second joint), 20. Support mechanism, 21 to 25. Support member (long member), 30. Joint part (adjustment mechanism), 40 ... block installation device, 41a ... side wall (plate-like member), 42 ... bracket, 44 ... shaft, 46 ... gripping mechanism, 48 ... propulsion jack, 51 ... middle wall (first Wall part), 52 ... Intermediate joint part (first joint part), C ... concrete, P ... joint block, Pa ... wall connection surface, Pb ... slab connection surface, S11 ... first wall part formation space.

Claims (7)

A first wall extending in the up-down direction; a second wall extending in the up-down direction and facing the first wall; and an upper portion between the first wall and the second wall A concrete structure comprising: a first slab portion located on the first wall portion; and a first joint portion which is installed on the first wall portion and connects the first wall portion and the first slab portion. A concrete structure construction method for constructing
A joint installation step of forming a first joint by installing a joint block constituted by a precast concrete member above the first wall formation space for forming the first wall; and ,
A wall forming step for forming concrete after placing the first wall portion in the first wall forming space after the joining portion setting step;
A concrete structure construction method in which, in the joint portion installation step, the joint block is installed above the first wall forming space by installing a support mechanism that supports the joint block. The concrete structure includes a second slab portion positioned below the first wall portion and the second wall portion so as to face the first slab portion, and the first wall portion. A second joining portion that is installed at a lower end position and connects the first wall portion and the second slab portion; and
The support mechanism includes an elongated member installed from the second joint portion to the first joint portion,
2. The method for constructing a concrete structure according to claim 1, wherein, in the wall forming step, the first wall is formed by embedding the elongated member and placing concrete. 3.   The said long member is a concrete structure construction method of Claim 2 which has an adjustment mechanism which adjusts length. Prior to the joint installation step, further includes a plate installation step of installing a plate-like member on the side of the first wall forming space on the outer peripheral side of the concrete structure to be constructed,
The said support mechanism is a concrete structure construction method as described in any one of Claims 1-3 provided with the bracket which was provided in the said plate-shaped member and protruded in the said 1st wall part formation space. Before the joint installation step, further comprising a preparation step of preparing a block installation device for installing the joint block,
The block installation device includes: a shaft extending in an axial direction along the first wall portion, the second wall portion, and the first slab portion of the concrete structure to be constructed; and the shaft A gripping mechanism that is provided so as to be pivotable and grips the joint block;
The joint installation step includes
A gripping step of gripping the joint block by the gripping mechanism;
5. A concrete structure construction according to claim 1, further comprising a rotational movement step of rotating the joint block in a state of being gripped by the gripping mechanism by turning the gripping mechanism. Method.   The said block installation apparatus is a concrete structure construction method of Claim 5 further provided with the propulsion jack which moves the said block installation apparatus to the said axial direction. The joint block has a wall connection surface for connecting to the first wall portion, and a slab connection surface for connecting to the first slab portion,
The concrete wall construction method according to any one of claims 1 to 6, wherein the wall connection surface is formed to be inclined upward toward the slab connection surface.

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