JP5474733B2 - Joining structure and joining method between foundation and lower part of supporting structure - Google Patents

Description

  The present invention relates to a joint structure between a foundation having a concrete wall and a lower part of a support structure, and a joining method thereof.

  Conventionally, a foundation having a concrete wall and a lower part of a support structure are designed to be joined via a top plate. FIG. 8 is a view showing a joint structure 110 (hereinafter simply referred to as “joint structure 110”) between a foundation having a concrete wall and a lower part of a support structure. The joint structure 110 includes a caisson foundation 107 that is a foundation having a concrete wall, a support structure 101, a top plate 105, and the like. A support structure 101 such as a bridge pier is provided on a top plate 105, and the top plate 105 is supported by a caisson foundation 107.

  The caisson foundation 107 and the top plate 105 are joined by a reinforcing bar anchor 103. In other words, the top plate 105 is installed on the top plate support part in which the inner surface of the side wall of the caisson foundation is reduced, and the parapet part in which the outer peripheral side of the caisson foundation 107 is extended upward is installed on the side surface of the top plate 105. A support structure 101 is placed on the plate 105. That is, the top plate 105 is fixed by the caisson foundation 107 whose upper side surface is L-shaped. Further, the top plate 105 and the caisson foundation 107 are connected via a reinforcing bar anchor 103. The support structure 101 and the top plate 105 are fixed by embedding the lower end of the support structure main reinforcing bar in the top plate 105. When the support structure 101 is made of steel, it is fixed by embedding the protruding end of the anchor bolt that fixes the flange portion at the lower end of the steel support structure 101 inside the top plate 105.

  When the caisson foundation and the lower part of the support structure are joined via the top plate as in the joint structure 110 as described above, the vertical stress is caused by the top plate support portion, the horizontal stress is caused by the parapet, and the bending moment is It transmits by a reinforcing bar anchor (for example, patent documents 1).

JP-A-8-260484

  However, when a structure in which the caisson foundation and the lower part of the support structure are joined via the top plate as in the conventional joining structure 110, it is necessary to construct the parapet and the top plate support at the upper end of the caisson foundation. . Further, it is necessary to add a reinforcing bar anchor 103 for reinforcement, and the structure of the caisson foundation and the shape of the reinforcing bar arrangement become complicated.

  As for the structure of the caisson foundation, as shown in FIG. 8, the inner diameter Le of the opening at the upper end of the caisson foundation 107 is smaller than the inner diameter Lf of the opening at the lower end of the caisson foundation 107. This is a cause of lowering construction efficiency in the process of carrying out earth and sand from the lower end of the opening during construction.

  Further, since the top plate 105 is designed as a single unit in consideration of the state of the simple support plate and the state of the fixed support plate, the amount of main reinforcing bars on the upper and lower surfaces increases.

  The present invention has been made in view of such a problem, and provides a joining structure and a joining method between a foundation having a concrete wall and a lower part of a supporting structure that are excellent in workability and can be constructed with a simple structure. For the purpose.

  In order to achieve the above-described object, the first invention is a joint structure between a foundation and a lower support structure, and includes a foundation having a cylindrical concrete wall, a joint provided on an upper inner surface of the foundation, A support structure lower part joined to the inner surface of the foundation via a joint, and the joint is a plate-like member in which a plurality of holes are formed, and a part including the holes of the joint The other part including the hole of the joint embedded in the foundation is embedded in the lower part of the support structure, and is a joint structure between the foundation and the lower part of the support structure.

  The joint includes a lower part of the support structure such that a surface direction of the plate-like member is substantially perpendicular to an axial direction of the foundation, and a width direction of the plate-like member extends over the foundation and the lower part of the support structure. A plurality may be provided at predetermined intervals in the circumferential direction between the base and the foundation.

  The cross-sectional shape of the foundation may be substantially constant from the bottom to the top. A penetrating rebar may be inserted into the hole of the joint at a portion embedded in the foundation and the lower portion of the support structure.

  According to the first invention, since the foundation and the lower portion of the support structure are joined via the joint, it is not necessary to design the parapet and the top plate support when constructing the foundation. In addition, since the inner surface of the foundation and the lower part of the support structure are directly joined via the joint member described above, the horizontal stress and bending moment are transmitted by the contact surfaces of the foundation and the lower part of the support structure.

  Further, the joint is formed between the lower part of the support structure and the foundation so that the surface direction of the plate member is substantially perpendicular to the axial direction of the foundation and the width direction of the plate member extends between the foundation and the lower part of the support structure. By providing a plurality at predetermined intervals in the circumferential direction, the stress in the vertical direction can be more reliably transmitted from the lower part of the support structure to the foundation.

  In addition, since the cross-sectional shape of the foundation is substantially constant from the bottom to the top, the foundation can be constructed with a simple arrangement of reinforcement, and the efficiency of the work of discharging earth and sand in the construction process is improved.

  In addition, the transmission of shearing force can be further improved by inserting the penetrating rebar through the hole of the joint embedded in the lower part of the foundation and the support structure.

  The second invention is a method for joining the foundation and the lower part of the support structure, using a joint made of a plate-like member in which a plurality of holes are formed, and previously connecting the joint to the upper inner surface of the foundation having a concrete wall. A step (a) of embedding the foundation in a state where a part including a hole is embedded and another part including the hole of the joint protrudes toward the inner surface side of the foundation; A step (b) of installing a support structure fixing member so that an upper part protrudes from an upper end of the foundation, and an inside of the foundation so as to embed a part of the joint and the support structure fixing member. And a step (c) of placing concrete on the bottom of the support structure.

  You may add the process (d) which installs a penetration rebar in the hole of the said joint in the middle of the said process (a) and (b).

  According to the second invention, the foundation and the lower portion of the support structure can be reliably joined with a simple structure. The foundation has a cylindrical shape and can be designed with a simple structure having a feature that is substantially constant from the bottom to the top. Therefore, the efficiency of the work for discharging earth and sand is improved. Since the inner surface of the foundation and the lower part of the support structure are directly joined via the joint member, the horizontal stress and bending moment can be transmitted by the contact surface between the foundation and the lower part of the support structure. Further, the stress in the vertical direction can be transmitted by the joint member.

  In addition, the transmission of shearing force can be further improved by inserting the penetrating rebar through the hole of the joint embedded in the lower part of the foundation and the support structure.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in workability | operativity and can provide the joining structure and joining method of the foundation which has a concrete wall which can be constructed | assembled with a simple structure, and a support structure lower part.

It is a figure which shows the joining structure of the foundation and support structure lower part in case a support structure is formed with a reinforced concrete, (a) is a whole front view, (b) is the sectional view on the AA line in (a), (c ) Is an enlarged view of a portion B shown in FIG. The figure which shows the construction process of the joining structure of a foundation and a support structure lower part. The figure which shows the construction process in case a support structure is formed with a reinforced concrete. It is a figure which shows the joining structure of the foundation and support structure lower part in case a support structure is formed with steel materials, (a) is a whole front view, (b) is CC sectional view taken on the line in (a), (c) ) Is a D-part enlarged view shown in (a). The figure which shows the construction process in case a support structure is formed with steel materials. It is a figure which shows other embodiment in case a support structure is formed with a reinforced concrete, (a) is a figure corresponding to the sectional view on the AA line of Fig.1 (a), (b) is FIG.1 (a). The enlarged view corresponding to B part of. It is a figure which shows other embodiment in case a support structure is formed with steel materials, (a) is a figure corresponding to CC sectional view taken on the line of Fig.4 (a), (b) is FIG.4 (b). The enlarged view corresponding to D part of. Conventional structure of caisson foundation and lower part of support structure.

  Hereinafter, a joint structure between a foundation having a concrete wall and a lower part of a support structure according to an embodiment of the present invention will be described. FIG. 1 is a view showing a joint structure 2 between a foundation and a lower part of a support structure when the support structure is formed of reinforced concrete, FIG. 1 (a) is an overall front view, and FIG. 1 (b) is FIG. ) Is a cross-sectional view taken along the line AA in FIG. 1, and FIG. The joint structure 2 between the foundation 1 and the lower support structure 10 is mainly composed of the foundation 1, the lower support structure 10, the joint member 9, and the like. The lower part 10 of the support structure is composed of a support structure main reinforcing bar, a belt reinforcing bar 3 and concrete 5 which are support structure fixing members.

  The foundation 1 is a cylindrical member having a concrete wall. Here, the term “cylindrical” refers to a hollow body having a rectangular shape or the like as well as a cylindrical shape. The cross-sectional shape of the foundation 1 is substantially constant in the longitudinal direction. That is, the parapet and the top plate support portion are not formed. The foundation 1 can be applied to the top plate structure of the caisson foundation or the PC well foundation.

  The joint member 9 has a plate shape and is provided between the upper inner peripheral surface of the foundation 1 and the concrete 5. Details of the joint member 9 will be described later.

  A support structure lower portion 10 is joined to the upper inside of the foundation 1 via a joint member 9. The supporting structure main reinforcing bar and the belt reinforcing bar 3 are installed inside the foundation 1, and are embedded together with the joint member 9 with the concrete 5. The upper ends of the support structure main reinforcing bar and the belt reinforcing bar 3 protrude from the upper surface of the concrete 5. Support structure main reinforcing bars and band reinforcing bars (not shown) constituting the main body of the supporting structure can be joined to the supporting structure main reinforcing bars and band reinforcing bars 3 protruding from the upper surface of the concrete 5.

  The support structure is, for example, a pier lower part or a wind power generation tower lower end. Note that the cross section of the support structure is not limited to a circular shape, and can be applied to a rectangular shape, an octagonal shape, an elliptical shape, or the like. When there is a difference between the outer diameter size of the support structure and the inner diameter of the foundation 1, the lower part 10 of the support structure may be widened in accordance with the shape of the inner surface of the foundation 1. Similarly, when the cross-sectional shape of the support structure is different from the cross-sectional shape of the foundation 1, the support structure lower portion 10 may be widened in accordance with the cross-sectional shape of the support structure.

  As shown in FIG. 1B, the plate-like joint members 9 are arranged radially so that the surface direction is substantially perpendicular to the axial direction of the foundation 1. That is, a plurality of joint members 9 are installed at a predetermined interval in the circumferential direction between the support structure lower part 10 and the foundation 1. Further, the joint member 9 is arranged so that the width direction thereof extends over the foundation 1 and the concrete 5 constituting the support structure lower part 10. The number of joint members 9 installed is not limited to the illustrated example.

  As shown in FIG. 1C, the joint member 9 is a plate-like member having a plurality of holes 7a and a plurality of holes 7b. The joint member 9 is a metal member such as a steel material. At least one row of holes 7a and at least one row of holes 7b are provided in the joint member 9 main body substantially in parallel. The joint member 9 may be formed with a plurality of holes in three or more rows, and the size of the holes can be appropriately set for each row.

  Concrete constituting the concrete 5 and the foundation 1 goes around the holes 7b and 7a, respectively. Therefore, the joint member 9 transmits necessary stress according to the strength of each concrete. That is, the stress and bending moment in the horizontal direction can be transmitted by the contact surface between the foundation 1 and the lower part 10 of the support structure, and the stress in the vertical direction can be transmitted by the joint member 9. The joint member 9 can adjust the size and pitch of the holes, so that even if the concrete 5 and the concrete constituting the foundation 1 are different types of concrete having different strengths, stress transmission between the different types of concrete is possible. The foundation 1 can be joined.

  Next, a procedure for joining a foundation having a concrete wall and a lower part of the support structure when the support structure is formed of reinforced concrete will be described. 2 and 3 are views showing a joining process of the foundation 1 and the lower part 10 of the support structure.

  First, the foundation 1 is buried in the ground as shown in FIG. At this time, a part of the joint member 9 is embedded in the upper inner surface of the foundation 1 in advance. The joint member 9 is formed with a plurality of holes in at least two rows, and includes at least one other plurality of holes in a state in which the plurality of holes in at least one row protrude from the inner surface side of the foundation 1. The part is embedded in the upper inner surface of the foundation 1 in advance. For example, as shown in the figure, when the joint member 9 having a plurality of holes in two rows is used, a plurality of holes in one row are embedded in the foundation 1, and another row of holes is embedded in the inner surface of the foundation 1. Exposed. A plurality of such joint members 9 are provided on the inner peripheral surface of the foundation 1 at a substantially constant interval in the circumferential direction, and a plurality of joint members 9 are also installed in the vertical direction as necessary (in the figure, the joint members are arranged in the vertical direction). 9 shows an example in which three stages are installed).

  Next, the mold 11 is installed on the inner surface of the foundation 1. The formwork 11 is provided and fixed at a predetermined height (below the installation range of the joint member 9 described above) from the upper part of the foundation 1 so that the lower part of the support structure described later can be installed.

  Next, as shown to Fig.3 (a), the support structure main reinforcement and the strip reinforcement 3 are installed so that a part may protrude from the upper end of the foundation 1. FIG. After inserting the supporting structure main reinforcing bar and the belt reinforcing bar 3 inside the foundation 1, the concrete 5 is placed on the formwork 11. That is, a part of the supporting structure main reinforcing bar and the band reinforcing bar 3 and the joint member 9 are embedded by the concrete 5 to form the supporting structure lower part 10.

  In addition, as shown in FIG.3 (b), when the length of the foundation 1 is short, it is possible to abbreviate | omit the formwork 11 by placing the poor mixing concrete 13 inside the foundation 1. FIG. Moreover, it is also possible to use foamed mortar and fluidized soil fluidized soil instead of poor blended concrete. In this case, the supporting structure main reinforcing bar and the belt reinforcing bar 3 may be installed on the upper part of poor blended concrete or the like, and then the concrete 5 may be placed.

  In addition, the supporting structure main reinforcing bar and the strip reinforcing bar 3 exposed on the concrete 5 and the reinforcing bars and the like (not shown) constituting the supporting structure main body can be coupled by, for example, a joint or welding. The support structure main body can be constructed by placing concrete 6 after joining the support structure main reinforcing bar and the rebar 3 and the reinforcing bars constituting the support structure main body.

  Thus, according to the joining structure 2 according to the embodiment of the present invention, a joining structure between the foundation 1 and the support structure lower part 10 which is a simple structure can be configured. Further, the foundation 1 and the support structure lower portion 10 can be reliably joined by the joint member 9. That is, the stress in the vertical direction is reliably transmitted to the foundation 1 by the joint member 9, and the stress and the bending moment in the horizontal direction are reliably transmitted to the foundation 1 by the contact surface between the foundation 1 and the concrete 5. Moreover, since it is not necessary to expand the foundation 1 and to construct a parapet or a top plate support part, it is excellent in workability.

  Further, when the foundation 1 is a caisson foundation, since the foundation 1 has a simple structure, it can be applied to various caisson construction methods such as an open caisson method and a pneumatic caisson method. The foundation 1 may be a concrete structure other than the caisson foundation, such as a top plate structure of a PC well foundation.

  Next, a joint structure between a foundation having a concrete wall and a lower part of the support structure when the support structure according to the second embodiment of the present invention is formed of a metal member such as steel will be described. FIG. 4 is a view showing a base structure and a joining structure 20 at the bottom of the support structure when the support structure is formed of a metal member such as a steel material. FIG. 4 (a) is an overall front view, and FIG. FIG. 4A is a sectional view taken along the line CC in FIG. 4A, and FIG. 4C is an enlarged view of a portion D shown in FIG. In the following embodiments, the same reference numerals as those in FIGS. 1 to 3 are given to configurations having the same functions as those of the connection structure 2, and redundant descriptions are omitted.

  The joint structure 20 between the foundation and the lower part of the support structure mainly includes the foundation 1, the lower part of the support structure 26, the joint member 9, and the like. The support structure lower portion 26 is composed of anchor frames 23 a and 23 b and anchor bolts 25 that constitute a support structure fixing member, and concrete 21. In the following description, the anchor frames 23a and 23b and the anchor bolt 25 are collectively referred to as an anchor member.

  The anchor frames 23a and 23b are substantially rectangular steel hollow members. The anchor bolt 25 is a rod-shaped steel member. Anchor bolts 25 are joined by screws or the like in the vicinity of the four corners of the lower anchor frame 23b. Similarly, the anchor bolts 25 are arranged at the four corners of the upper anchor frame 23a, and are joined by screws or the like. Many anchor bolts may be arranged according to the bending moment transmitted to the lower end of the support structure. In addition, as an anchor member, it is not restricted to the said aspect.

  A support structure lower portion 26 is joined to the upper inside of the foundation 1 through a joint member 9. The anchor member is installed on the inner side of the foundation 1 and embedded with the concrete 21 together with the joint member 9. At this time, the anchor frame 23 a is exposed on the upper surface of the concrete 21. A steel support structure 19 can be further joined to the anchor member exposed from the upper surface of the concrete 21.

  The support structure is, for example, a pier lower part or a wind power generation tower lower end. Note that the cross section of the support structure is not limited to a circular shape, and can be applied to a rectangular shape, an octagonal shape, an elliptical shape, or the like. When there is a difference between the outer dimensions of the support structure and the inner diameter of the foundation 1, the support structure lower portion 26 is widened in accordance with the shape of the inner surface of the foundation 1. Similarly, when the cross-sectional shape of the support structure is different from the cross-sectional shape of the foundation 1, the support structure lower portion 10 may be widened in accordance with the cross-sectional shape of the support structure.

  As shown in FIG. 4B, the joint member 9 is arranged so that the width direction of the joint member 9 extends over the foundation 1 and the concrete 21 constituting the lower part of the support structure. In addition, about the installation form of the coupling member 9, it is the same as that of the junction structure 2 mentioned above.

  Further, as shown in FIG. 4C, at least one row of holes 7a and at least one row of holes 7b are provided in the joint member 9 main body substantially in parallel, and are embedded in the foundation 1 and the concrete 21, respectively.

  Concrete constituting the concrete 21 and the foundation 1 goes around inside the holes 7b and 7a, respectively. Therefore, the joint member 9 can perform necessary stress transmission according to the strength of each concrete. That is, the stress and the bending moment in the horizontal direction can be transmitted by the contact surface between the foundation 1 and the lower support structure 26, and the stress in the vertical direction can be transmitted by the joint member 9.

  Next, a procedure for joining a foundation having a concrete wall and a lower part of the support structure when the support structure is formed of a metal member such as a steel material will be described. FIG. 5 is a view showing a joining process between the foundation 1 and the lower support structure 26.

  First, similarly to the method shown in FIG. 2, the foundation 1 is buried in the ground. At this time, a part of the joint member 9 is embedded in the upper inner surface of the foundation 1 in advance. The joint member 9 is formed with a plurality of holes in at least two rows, and includes at least one other plurality of holes in a state in which the plurality of holes in at least one row protrude from the inner surface side of the foundation 1. The part is embedded in the upper inner surface of the foundation 1 in advance.

  Next, the formwork 18 is installed on the inner surface of the foundation 1. The formwork 18 is provided and fixed at a predetermined height (below the installation range of the joint member 9 described above) from the upper part of the foundation 1 so that the lower part of the support structure described later can be installed.

  Next, as shown in FIG. 5A, the anchor member is installed so as to be exposed from the upper end of the foundation 1. After the anchor member is inserted inside the foundation 1, concrete 21 is placed on the mold 18. That is, part of the anchor member (below the anchor frame 23b and the anchor bolt 25) and the joint member 9 are embedded.

  In addition, as shown in FIG.5 (b), when the length of the foundation 1 is short, it is possible to abbreviate | omit the formwork 18 by placing the poor mixing | blending concrete 28 inside the foundation 1. FIG. It is also possible to use foamed mortar or fluidized soil instead of poor blended concrete. The anchor member may be installed on the top of poor blended concrete or the like, and then concrete 21 may be cast.

  The anchor member exposed on the concrete 21 and the steel support structure 19 can be joined together by welding, for example.

  Thus, according to the joining structure 20 according to the second embodiment, the base 1 and the support structure lower portion 26 can be joined by the joint member 9 with a simple structure. At this time, the stress in the vertical direction is transmitted to the foundation 1 by the joint member 9, and the stress and bending moment in the horizontal direction are reliably transmitted to the foundation 1 by the contact surface between the foundation 1 and the concrete 21. Moreover, the part exposed from the base 1 upper end of the anchor member and the steel support structure can be joined. Moreover, since it is not necessary to expand the foundation 1 and to construct a parapet or a top plate support part, it is excellent in workability.

  Further, when the foundation 1 is a caisson foundation, since the foundation 1 has a simple structure, it can be applied to various caisson construction methods such as an open caisson method and a pneumatic caisson method. The foundation 1 may be a concrete structure other than the caisson foundation, such as a top plate structure of a PC well foundation.

  Next, another embodiment will be described. In the following embodiments, configurations having the same functions as those shown in FIG. 1 and the like are denoted by the same reference numerals as those in FIG.

  FIG. 6 is a view showing another embodiment in which the support structure is formed of reinforced concrete. FIG. 6 (a) is a cross-sectional view of a portion corresponding to the line AA in FIG. 1 (a). (B) shows the enlarged view corresponding to B part of Drawing 1 (a) similarly.

  In the present embodiment, as shown in FIGS. 6A and 6B, the penetration reinforcing bar 31 is inserted into the hole 7 b of the joint member 9. Similarly, the penetrating rebar 32 is inserted into the hole 7 a of the joint member 9. The penetration reinforcing bar 31 and the penetration reinforcing bar 32 are substantially ring-shaped, and are provided in the circumferential direction. The penetration reinforcing bar 31 and the penetration reinforcing bar 32 may be inserted after the foundation 1 is buried in the ground, for example. Note that the penetrating rebar 31 and the penetrating rebar 32 do not have to be connected all together, and the short rebar may be penetrated through the joint member 9. By reinforcing the joint between the foundation 1 and the lower portion of the support structure using the penetrating rebar 31 and the penetrating rebar 32, the transmission of shearing force can be further improved.

  FIG. 7 is a view showing another embodiment in which the support structure is formed of a steel material. FIG. 7 (a) is a cross-sectional view of a portion corresponding to line CC in FIG. 4 (a). FIG. 4B is an enlarged view corresponding to the portion D in FIG.

  As shown in FIGS. 7A and 7B, in this case, the penetration rebar 35 may be inserted into the hole 7b of the joint member 9 and the penetration rebar 36 may be inserted into the hole 7a. The penetrating rebar 35 and the penetrating rebar 36 have the same configuration as the penetrating rebar 31 described above. By using the penetration reinforcing bar 35 and the penetration reinforcing bar 36, the transmission of the shearing force can be further improved by reinforcing the joint between the foundation 1 and the lower part of the support structure.

  Although the embodiments of the present invention have been described with reference to the accompanying drawings, the technical scope of the present invention is not affected by the above-described embodiments. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the embodiments can be combined with each other, and the shape, installation range, installation number, and the like of each component can be set as appropriate.

1,
1a, 1b ......... Foundation 2 ......... Joint structure 3 ......... Support structure main reinforcement and strip reinforcement 5 ......... Concrete 6 ......... Concrete 7a, 7b ......... Hole 9 ......... Joint member 10 ... ...... Support structure lower part 11 ......... Formwork 13 ......... Poor blended concrete 18 ......... Formwork 19 ......... Steel support structure 20 ......... Joint structure 21 ......... Concrete 23a, 23b …… ... Anchor frame 25 ... Anchor bolt 26 ... Lower support structure 28 ... Poorly mixed concrete 31, 32, 35, 36 ... ... Reinforcing bar 101 ... Support structure 103 ... Reinforcing bar anchor 105 ……… Top plate 107 ……… Caisson foundation 110 ……… Joint structure

Claims (6)

It is a joint structure between the foundation and the lower part of the support structure,
A foundation having a cylindrical concrete wall;
A joint provided on the upper inner surface of the foundation;
A lower support structure joined to the inner surface of the foundation via the joint;
Comprising
The joint is a plate-like member in which a plurality of holes are formed,
A part including the hole of the joint is embedded in the foundation,
The other part including the hole of the joint is embedded in the lower part of the support structure, and the joint structure between the foundation and the lower part of the support structure.   The joint includes a lower part of the support structure such that a surface direction of the plate-like member is substantially perpendicular to an axial direction of the foundation, and a width direction of the plate-like member extends over the foundation and the lower part of the support structure. The joint structure of the foundation and the lower part of a support structure according to claim 1, wherein a plurality of gaps are provided at predetermined intervals in a circumferential direction between the foundation and the foundation.   The joint structure between the foundation and the lower portion of the support structure according to claim 1 or 2, wherein a cross-sectional shape of the foundation is substantially constant from a bottom portion to a top portion.   The penetration reinforcing bar is penetrated in the hole of the joint of the portion embedded in the foundation and the lower part of the support structure, The penetration reinforcing bar according to any one of claims 1 to 3 characterized by things. Connection structure between the foundation and the lower part of the support structure. A method of joining the foundation and the lower part of the support structure,
Using a joint consisting of a plate-like member in which a plurality of holes are formed,
A portion including the hole of the joint is embedded in advance in the upper inner surface of the foundation having a concrete wall, and the other portion including the hole of the joint projects into the inner surface side of the foundation. Embedded in (a),
A step (b) of installing a support structure fixing member inside the upper part of the foundation such that the upper part protrudes from the upper end of the foundation;
(C) placing concrete in the foundation so as to embed a part of the joint and the support structure fixing member;
A method of joining the foundation and the lower part of the support structure characterized by comprising:   6. The foundation and the lower part of the support structure according to claim 5, further comprising a step (d) of installing a penetration rebar in the hole of the joint during the steps (a) and (b). Joining method.

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