JP7591241B1 - Method of constructing foundations for buildings, method of constructing buildings, and foundation structure of buildings - Google Patents

Abstract

[Problem] To provide a foundation construction method for a building, a building construction method, and a foundation structure for a building, which are capable of constructing a strong foundation while shortening the construction period. [Solution] The method includes a foundation arrangement step of supporting a foundation body 1 on a foundation construction surface M with a foundation support jig G, an anchor installation step of installing an anchor 2 on the foundation body 1 so as to extend downward from the foundation body 1, a reinforcing bar arrangement step of arranging rising portion rebars around the anchor 2, and a foundation construction step of forming a rising portion 210 in the rising portion region to construct a foundation 200 in which the rising portion 210 and the foundation body 1 are integrated, and in the anchor installation step, a J-shaped anchor or an L-shaped anchor is used as the anchor 2, whose upper region 20 extends in a height direction D1 and whose lower region 21 curves or bends relative to the upper region 20, and the anchor 2 is installed so that the lower region 21 curves or bends from the upper region 20 toward the foundation length direction D2. [Selected Figure] Figure 4

Description

The present invention relates to a foundation construction method for constructing the foundation of a building, a construction method including the same, and a foundation structure for a building.

When constructing a concrete foundation for a building, typically, a base concrete is poured into the ground, and then concrete is poured on top of that so that rebar is embedded in the concrete to form a rising section. Anchors are installed so that they protrude upward from this rising section. The base is then placed on top of the rising section, and the anchors are inserted into the base and tightened with nuts to secure the base to the rising section and complete the foundation.

However, because such general construction methods require a lot of work, a construction method such as that described in Patent Document 1 has been proposed to shorten the construction period. In the construction method described in Patent Document 1, the foundation is supported on the ground while being raised above the ground, reinforcing bars are placed between the ground and the foundation, and anchors are hung so that they protrude downward from the foundation, and then concrete is poured between the ground and the foundation so that the reinforcing bars and anchors are buried, forming a rising section, and a foundation is constructed in which this rising section and the foundation are integrated.

JP 2006-322154 A

In the construction method of Patent Document 1, the anchor that is hung in advance from the foundation is a J-shaped anchor with a lower region curved relative to the upper region, but the lower region of this anchor is arranged to curve from the upper region toward the outside in the width direction of the foundation. For this reason, when the anchor is embedded in concrete, it is difficult to ensure a sufficient distance from the lower region of the anchor to the width direction end face of the rising part. Therefore, there is a possibility that the anchor will not be able to obtain sufficient fixing force for the foundation to the rising part.

The present invention provides a foundation construction method for a building that can build a strong foundation while shortening the construction period, a building construction method equipped with the same, and a foundation structure for a building.

The foundation construction method for a building according to one aspect of the present invention is a method for constructing a foundation for a building, comprising a foundation placement process for placing a foundation above the foundation construction surface that extends in the horizontal direction so as to extend in the horizontal direction at a distance from the foundation construction surface, and supporting the foundation on the foundation construction surface with a foundation support jig extending downward from the foundation; an anchor installation process for installing anchors in the foundation so as to extend downward from the foundation; a reinforcing bar arrangement process for arranging reinforcing bars around the anchors in the rising portion region between the foundation and the foundation construction surface; and a concrete reinforcing bar arrangement process for applying concrete to the rising portion region. and a foundation construction process in which a foundation is constructed in which a rising portion is formed in the rising portion region by pouring a foundation bar, the rising portion rebar and the anchor are embedded in the rising portion, and the rising portion and the foundation are integrated into one. In the anchor installation process, a J-shaped anchor or an L-shaped anchor is used as the anchor, in which the upper region extends in the height direction and the lower region curves or bends relative to the upper region, and the anchor is installed so that the lower region curves or bends from the upper region toward the length direction of the foundation, which is the extension direction of the foundation.

In the above foundation construction method, the foundation is a structural material with an H-shaped cross section composed of a lower flange that contacts the rising portion, an upper flange that is arranged above the lower flange, and a web that connects the lower flange and the upper flange. The method further includes a reinforcing step of providing a reinforcing member between the upper flange and the lower flange in the foundation before the anchor installation step. The reinforcing member has an upper flange facing plate portion that is arranged to face the upper flange in the foundation so as to contact it from below, a lower flange facing plate portion that is arranged to face the lower flange in the foundation so as to contact it from above, and a web facing plate portion that connects the upper flange facing plate portion and the lower flange facing plate portion and is arranged to face the web in the foundation so as to contact it. In the anchor installation step, the upper region of the anchor may be inserted through the lower flange of the foundation and the lower flange facing plate portion of the reinforcing member, and the upper region may be fixed to the reinforcing member.

In the above foundation construction method, the reinforcing step may use a reinforcing member in which the plate thickness dimension of the web facing plate portion is smaller than the plate thickness dimension of each of the pair of flange facing plate portions.

In the above foundation construction method, the reinforcing step further includes a connecting plate section that is erected from the web facing plate section in the plate thickness direction of the web facing plate section and connects the upper flange facing plate section and the lower flange facing plate section at a midway position in the plate width direction of the upper flange facing plate section and the lower flange facing plate section that coincides with the base length direction, and the plate thickness dimension of the connecting plate section is smaller than the plate thickness dimensions of the upper flange facing plate section and the lower flange facing plate section. In the anchor installation step, the anchors may be installed one on each side in the plate width direction, sandwiching the connecting plate section.

In the anchor installation step of the above foundation construction method, the anchors may be installed so that the lower regions of the anchors installed on both sides of the lower flange opposing plate portion in the plate width direction across the connecting plate portion are curved or bent away from each other.

In the above foundation construction method, the lower flange facing plate portion of the reinforcing member has anchor through holes, through which the anchors are inserted, formed on both sides of the connecting plate portion in the plate width direction of the lower flange facing plate portion that coincides with the foundation length direction, and the distance between the centers of the two anchor through holes is defined as the hole distance d, and when the anchor is installed on the foundation and viewed from the foundation width direction, the distance in the foundation length direction from the center of the upper region to the tip of the lower region of the anchor is defined as the maximum width dimension w of the anchor, and the anchor installation process may satisfy w>d/2.

A method for constructing a building according to one aspect of the present invention includes the above-mentioned foundation construction method and a column installation step for installing a column or beam on the top of the foundation, in which the reinforcing members are provided on both sides of the web with the web in between, and in which bolts are inserted through the upper flange facing plate portion of the reinforcing member and the upper flange of the foundation, and the column installation step fixes the column or beam to the foundation with the bolts.

The foundation structure of a building according to one aspect of the present invention is a foundation structure that is supported above a foundation construction surface that extends in the horizontal direction, and that contacts a rising section made of concrete erected from the foundation construction surface to form a foundation for the building together with the rising section, and is provided with a foundation main body that extends in the horizontal direction in an installation position provided on the upper surface of the rising section, and an anchor that is installed on the foundation main body so as to extend downward from the foundation main body in the installation position and is embedded in the rising section in the installation position to form the foundation, and the anchor in the installation position is a J-shaped anchor or an L-shaped anchor that is composed of an upper region that extends in the height direction in the installation position, and a lower region that curves or bends relative to the upper region toward the extension direction of the foundation main body.

The above-mentioned building foundation construction method, the building construction method equipped with the same, and the building foundation structure make it possible to build a strong foundation while shortening the construction period.

FIG. 2 is a plan view of a foundation structure according to an embodiment of the present invention. FIG. 2 is a perspective view of the foundation structure as viewed from the width direction of the foundation, showing an enlarged view of part A in FIG. 1. 2 is a cross-sectional view of the foundation including the foundation structure as viewed from the longitudinal direction of the foundation, taken along the line B-B of FIG. 1. 2 is a side view of the foundation including the foundation structure as viewed from the width direction of the foundation, as viewed from the arrow C in FIG. 1. Note that the illustration of reinforcing bars is omitted in this drawing. FIG. 2 is a perspective view of the joint member for a structural material in the assembled structural material, as viewed from the square nut side.

(Overall configuration of the foundation structure)
The foundation structure 100 is a structure for constituting a foundation 200 of a building. As shown in Fig. 1, the foundation structure 100 of this embodiment is integrated with a rising portion 210 formed of concrete that constitutes the foundation 200 together with the foundation structure 100, and is supported from below by the rising portion 210. Specifically, the foundation structure 100 includes a foundation body (foundation) 1 extending horizontally as shown in Fig. 2, and an anchor 2 and a reinforcing member 3 provided on the foundation body 1.
(Base body)

The base body 1 is made of a structural material with an H-shaped cross section, i.e., H-shaped steel, and is formed, for example, in a frame shape that spreads out on a horizontal plane to correspond to the shape of the building. The base body 1 has plate-shaped upper flange 10 and lower flange 11 whose plate thickness direction coincides with the height direction D1, and a plate-shaped web 12 that connects the upper flange 10 and lower flange 11 and is provided so that its plate thickness direction coincides with the horizontal direction. When the base body 1 is in the installation position installed on the rising portion 210, the lower surface of the lower flange 11 contacts the upper surface of the rising portion 210 as described below.

(anchor)
The anchor 2 is inserted into the lower flange 11 of the base body 1 and extends downward from the lower flange 11. That is, the anchor 2 is inserted into the anchor insertion hole 11a penetrating the lower flange 11 as shown in Fig. 3, and the upper end of the anchor 2 protrudes upward from the lower flange 11. The anchor 2 is composed of an upper region 20 having a rod shape extending straight in the height direction D1, and a lower region 21 having a rod shape curved (or bent) toward the extension direction of the base body 1 (hereinafter referred to as the base length direction D2) with respect to the upper region 20 (see also Fig. 2). A male thread 20a is formed on the outer peripheral surface of the upper end of the upper region 20, and the anchor 2 is a so-called J-shaped or L-shaped anchor (anchor bolt).

The anchors 2 are spaced apart in the base length direction D2 and hang down from the lower flange 11. In this embodiment, the anchors 2 are provided below the columns 300 that constitute the building, as described in detail below. That is, the anchors 2 are provided at positions that overlap with the columns 300 when viewed from the height direction D1, and are provided in pairs so as to be adjacent to each other in the base length direction D2 below each of the multiple columns 300. The lower regions 21 of the two anchors 2 in each pair are provided so as to curve from the upper region 20 of each anchor 2 on the sides that are separated from each other in the base length direction D2.

That is, as shown in FIG. 4, of the two anchors 2 arranged in the base length direction D2 below each pillar 300, the lower region 21A of the anchor 2A on one side of the base length direction D2 extends curvedly to one side of the base length direction D2 relative to the upper region 20A, and the lower region 21B of the anchor 2B on the other side of the base length direction D2 extends curvedly to the other side of the base length direction D2 relative to the upper region 20B. Furthermore, these sets of anchors 2A, 2B are provided in pairs with a gap in the base width direction D3 perpendicular to the base length direction D2, sandwiching the web 12 of the base main body 1. Therefore, in this embodiment, four anchors 2 are provided below each pillar 300.

(Reinforcing member)
The reinforcing members 3 are provided in an area X surrounded by the upper flange 10, the lower flange 11, and the web 12 of the base body 1. In this embodiment, the reinforcing members 3 are provided in pairs in the areas X on both sides of the web 12 in the base width direction D3 (see FIG. 3). These pairs of reinforcing members 3 are provided below each column 300 and above the four anchors 2. In other words, substantially the entirety (or a part of it) of the reinforcing members 3 is disposed at a position overlapping the columns 300 when viewed from the height direction D1.

Each reinforcing member 3 is made of, for example, steel, and is a casting that is integrally formed by casting. Specifically, the reinforcing member 3 has an upper flange facing plate portion 30, a lower flange facing plate portion 31, a web facing plate portion 32, and a connecting plate portion 33.

The upper flange facing plate portion 30 is disposed facing the upper flange 10 of the base body 1 from below, with its surface in contact with the upper flange. The upper flange facing plate portion 30 also has a bolt hole 30a that penetrates the upper flange facing plate portion 30 in the plate thickness direction, i.e., in the height direction D1. A pair of bolt holes 30a are formed in the upper flange facing plate portion 30 with a gap in the plate width direction, which coincides with the base length direction D2, sandwiching a connecting plate portion 33, which will be described in detail later.

A bolt 310 is inserted into each bolt hole 30a through a bolt insertion hole 10a that penetrates the upper flange 10, and the upper flange facing plate portion 30 and the upper flange 10 are fixed together by a square nut 403 (described later) that is screwed onto the bolt 310. The plate thickness dimension t1 of the upper flange facing plate portion 30 is, for example, 12 mm. The upper flange facing plate portion 30 may be fixed to the upper flange 10 by welding together with the bolt 310.

The lower flange facing plate portion 31 is disposed so that its surface is in contact with the lower flange 11 of the base body 1 from above. The lower flange facing plate portion 31 has substantially the same shape, size, and structure as the upper flange facing plate portion 30, and is disposed at substantially the same position as the upper flange facing plate portion 30 in the base length direction D2 and the base width direction D3. The lower flange facing plate portion 31 has an anchor through hole 31a that penetrates the lower flange facing plate portion 31 in the plate thickness direction, i.e., in the height direction D1. The anchor through holes 31a are formed in pairs on the lower flange facing plate portion 31 with a gap in the plate width direction that coincides with the base length direction D2, sandwiching the connecting plate portion 33, which will be described in detail later, so that one is disposed on each side of the base length direction D2, sandwiching the connecting plate portion 33. These anchor through holes 31a are provided at approximately the same positions in the base length direction D2 and base width direction D3 as the bolt holes 30a in the upper flange facing plate portion 30 so as to correspond to the bolt holes 30a.

Each anchor through hole 31a is provided at approximately the same position in the base length direction D2 and base width direction D3 with respect to the corresponding anchor insertion hole 11a of the lower flange 11, and the upper end of the anchor 2 is inserted through it. Then, by screwing a nut 320 onto the male thread 20a of the anchor 2 from above the lower flange facing plate portion 31, the anchor 2 is fixed to the lower flange 11 of the base body 1 and the lower flange facing plate portion 31 of the reinforcing member 3 in the height direction D1, and the anchor 2 is suspended from the base body 1 so as to extend downward from the lower flange 11.

Here, the distance between the centers O1 of two anchor through holes 31a aligned in the base length direction D2 is defined as the hole distance d, and when the anchor 2 is installed on the base body 1 and viewed from the base width direction D3, the distance in the base length direction D2 from the central axis O2 of the upper region 20 of the anchor 2 to the tip 21x of the lower region 21 of the anchor 2 is defined as the maximum width dimension w of the anchor 2, and satisfies w>d/2.

(Web facing plate portion)
The web facing plate portion 32 connects the upper flange facing plate portion 30 and the lower flange facing plate portion 31, and is disposed opposite to the web 12 of the base body 1 so that its surface is in contact with the web 12. Thus, the web facing plate portion 32 has the upper flange facing plate portion 30 and the lower flange facing plate portion 31 protruding from itself in the base width direction D3, and when the web facing plate portion 32 together with the upper flange facing plate portion 30 and the lower flange facing plate portion 31 are viewed from the base length direction D2, these members as a whole form a substantially U-shape (see FIG. 3).

In addition, the web-facing plate portion 32 is formed with bolt holes 32a penetrating the web-facing plate portion 32 in the plate thickness direction, i.e., in the base width direction D3 (see FIG. 3). The bolt holes 32a are formed in pairs at intervals in the height direction D1, and these pairs of bolt holes 32a are further provided in pairs on both sides of the connecting plate portion 33, which will be described in detail later, in the base length direction D2. Thus, the bolt holes 32a are provided in a total of four places in the web-facing plate portion 32. The web-facing plate portion 32 is fixed to the web 12 by bolts 330 inserted into the bolt holes 32a through the bolt insertion holes 12a (see FIG. 3) that penetrate the web 12. In this embodiment, the web-facing plate portions 32 of the two reinforcing members 3 arranged on both sides of the base width direction D3 across the web 12 are fixed to each other with the web 12 sandwiched between them by the bolts 330 and nuts 340 screwed thereto. In addition to being fixed by the bolts 330, the web facing plate portion 32 may be fixed to the web 12 by welding.

The web facing plate portion 32 has a smaller plate thickness than the upper flange facing plate portion 30 and the lower flange facing plate portion 31, and the plate thickness t2 of the web facing plate portion 32 is, for example, 4.5 mm or more and 6.0 mm or less (see FIG. 3). In other words, the plate thickness t2 of the web facing plate portion 32 is 3/8 times or more and 1/2 times or less the plate thickness t1 of the upper flange facing plate portion 30 and the lower flange facing plate portion 31.

(Connection plate part)
The connecting plate portion 33 is erected from the web facing plate portion 32 in the base width direction D3 that coincides with the plate thickness direction of the web facing plate portion 32, and is arranged so that its plate thickness direction coincides with the base length direction D2. The connecting plate portion 33 connects the upper flange facing plate portion 30 and the lower flange facing plate portion 31 at a mid-way position (exactly the middle position) in the plate width direction of the upper flange facing plate portion 30 and the lower flange facing plate portion 31 that coincides with the base length direction D2. The connecting plate portion 33 also protrudes from the web facing plate portion 32 in the base width direction D3 with approximately the same protruding dimension as the upper flange facing plate portion 30 and the lower flange facing plate portion 31. The plate thickness dimension t3 of the connecting plate portion 33 is smaller than the plate thickness dimension t1 of the flange facing plate portions 30 and 31. The plate thickness dimension t3 of the connecting plate portion 33 is, for example, 4.5 mm or more and 6.0 mm or less. In other words, the plate thickness dimension t3 of the connecting plate portion 33 is between 3/8 and 1/2 times the plate thickness dimension t1 of the flange opposing plate portions 30, 31, and in this embodiment, the plate thickness dimension t3 of the connecting plate portion 33 is the same as the plate thickness dimension t2 of the web opposing plate portion 32.

(Foundation construction method)
Next, a foundation construction method for constructing a foundation 200 for a building using the foundation structure 100 having the above-mentioned configuration will be described in detail with reference to FIGS.
First, a process (support surface forming process) is carried out in which a foundation construction surface M that extends horizontally is formed by pouring basin concrete into the ground. Then, a process (foundation placement process) is carried out in which the foundation structure 100 is supported on the foundation construction surface M. In this process, the foundation main body 1 is placed above the foundation construction surface M with a gap in the height direction D1 from the foundation construction surface M, a foundation support jig G is provided between the foundation construction surface M and the lower surface of the lower flange 11 of the foundation main body 1, and the foundation structure 100 is supported on the foundation construction surface M by this foundation support jig G.

The foundation support jig G has a structure that allows it to expand and contract in the height direction D1, and when supporting the foundation structure 100 on the foundation construction surface M, the length of the foundation support jig G is adjusted so that the top surface of the upper flange 10 of the foundation main body 1 is horizontal (placed on a horizontal plane).

After (or before) the process of supporting the foundation structure 100 on the foundation construction surface M (foundation placement process), a process of installing the reinforcing members 3 on the foundation body 1 (reinforcement process) is carried out. In this process, the reinforcing members 3 are provided in the region X between the upper flange 10 and the lower flange 11 of the foundation body 1. The reinforcing members 3 are provided in the region X on both sides of the web 12 of the foundation body 1.

Then, a process of installing the anchor 2 on the base body 1 (anchor installation process) is performed. This process may be performed after the above-mentioned reinforcement process, and may be performed after (or before) the above-mentioned base placement process. In this process, the anchor 2 is inserted into the anchor insertion hole 11a in the lower flange 11 of the base body 1 and the anchor through hole 31a in the lower flange facing plate portion 31 of the reinforcing member 3, and a nut 320 is screwed onto the male screw 20a of the anchor 2 from above the lower flange facing plate portion 31 of the reinforcing member 3, and the upper region 20 of the anchor 2 is fixed to the reinforcing member 3, so that the anchor 2 hangs down from the base body 1 so that the anchor 2 extends downward from the base body 1. At this time, the anchor 2 is installed on the base body 1 so that the lower region 21 of the anchor 2 curves from the upper region 20 toward the base length direction D2 as described above. The anchor 2 and the base support jig G are provided on the base body 1 at a position where they do not interfere with each other.

Next, the process of placing reinforcing bars (reinforcing bar placement process) is carried out. That is, the rising reinforcing bars 205 are placed around the anchors 2 in the rising region S (see Figure 2), which is the region between the base body 1 and the foundation construction surface M. The rising reinforcing bars 205 are composed of multiple main bars 205a extending in the base length direction D2 and multiple tie bars 205b arranged in a ring shape so as to surround these main bars 205a from the outside.

After that, a process of constructing the foundation 200 of the building (foundation construction process) is carried out. In this process, formwork K is installed on both sides of the rising portion area S in the foundation width direction D3 so as to sandwich the rising portion area S from both sides in the foundation width direction D3, and concrete is poured between these formwork K to form the rising portion 210. The formwork K is then removed. As a result, the foundation structure 100 is provided on the upper surface of the rising portion 210, and the foundation 200 constructed by integrating these is constructed. At this time, the anchor 2, the rising portion reinforcing bar 205, and the foundation support jig G are embedded in the rising portion 210 and become part of the foundation 200.

After constructing the foundation 200 in this manner, a process (pillar installation process) is carried out in which the pillar 300 is installed from above on the upper flange 10 of the base body 1, and finally the building is constructed. In the process of installing the pillar 300, the bolt 310 is inserted from below into the bolt hole 30a of the upper flange facing plate portion 30 of the reinforcing member 3 and the bolt insertion hole 10a of the upper flange 10 of the base body 1, and is screwed into the square nut 403 (described later) provided on the pillar 300, thereby fixing the pillar 300 to the base body 1.

Here, the column 300 is tubular and extends in the height direction D1, with an end opening 300x formed in its longitudinal end face 300a, which coincides with the height direction D1. In this embodiment, the column 300 is a rectangular steel pipe column with a rectangular (square) cross section perpendicular to its longitudinal direction. A joint member 400 is joined to the end face 300a of the column 300 by butt welding so as to close the end opening 300x.

As shown in FIG. 5, the joint member 400 is a plate-shaped base body 402 that is rectangular (square) when viewed from the height direction D1 and covers the end surface 300a and the end opening 300x (see FIG. 3 and FIG. 4) of the column 300, a square nut 403 provided on the base body 402, a nut rotation restricting body 404 that restricts the rotation of the square nut 403 on the base body 402, and a nut holder 405 that holds the square nut 403 on the base body 402. The square nuts 403 are respectively arranged at positions corresponding to the through holes 402a formed in the base body 402 near the four corners of the base body 402, and are arranged in a state in which some movement is allowed relative to the base body 402 in the base length direction D2 and base width direction D3, which are the surface direction of the base body 402. When the joint member 400 is joined to the column 300, the square nut 403 is arranged to be arranged in the space inside the column 300.

When installing the pillar 300 on the base body 1, each bolt 310 inserted into the bolt hole 30a in the upper flange facing plate portion 30 of the reinforcing member 3 and the bolt insertion hole 10a in the upper flange 10 of the base body 1 is screwed into the corresponding square nut 403 of the joint member 400.

(Action and Effect)
According to the foundation structure 100 of the present embodiment described above and the construction direction of the foundation 200 using the foundation structure 100, the foundation structure 100 with the anchor 2 installed thereon is prepared in advance, concrete is poured below the foundation structure 100 to form the rising portion 210, and the foundation structure 100 and the rising portion 210 are integrated together, so that the foundation 200 can be easily constructed. In addition, the anchor 2 provided on the foundation body 1 is provided so as to be curved in the foundation length direction D2 on the foundation body 1. Therefore, the amount of concrete around the anchor 2 when embedded in the rising portion 210 can be secured, and it is possible to obtain a sufficient fixing force of the foundation structure 100 to the rising portion 210. As a result, it is possible to construct a strong foundation while shortening the construction period.

Furthermore, the pillar 300 is provided above the anchor 2, and the pillar 300 and the anchor 2 are provided to the base body 1 at the same position in the base length direction D2 using the reinforcing member 3. Therefore, the pillar 300 and the anchor 2 can be provided together in the base body 1 while reinforcing the parts that require strength with the reinforcing member 3, which facilitates the installation work and shortens the construction period.

In addition, in the reinforcing member 3, the plate thickness dimension t2 of the web facing plate portion 32 is smaller than the plate thickness dimension t1 of the upper flange facing plate portion 30 and the lower flange facing plate portion 31. Therefore, the plate thickness of the upper flange facing plate portion 30 and the lower flange facing plate portion 31, which receive the load acting on the base body 1 from the column 300 and the anchor 2 in the height direction D1, can be increased to ensure strength, while the plate thickness of the web facing plate portion 32, which receives a relatively small load from the column 300 and the anchor 2, can be reduced to reduce the weight of the reinforcing member 3. Furthermore, by reducing the plate thickness dimension t2 of the web facing plate portion 32, a large installation space for the bolts 310 and the nuts 320 can be secured.

Furthermore, in the reinforcing member 3, the plate thickness dimension t3 of the connecting plate portion 33 is similarly smaller than the plate thickness dimension t1 of the upper flange facing plate portion 30 and the lower flange facing plate portion 31, so that the weight of the reinforcing member 3 can be reduced while ensuring the necessary strength, and a large installation space for the bolts 310, 330 and the nuts 320, 340 can be secured.

If the reinforcing member 3 were to be formed by joining multiple plates by welding, weld beads would be formed. In this case, the dimensions of the reinforcing member 3 would have to be made large to avoid interference between the bolts 310, 330 and the nuts 320, 340 and the weld beads. However, in this embodiment, the reinforcing member 3 is a cast metal, so there are no weld beads, and the reinforcing member 3 can be made compact.

Furthermore, the anchors 2 (2A, 2B) are installed on both sides of the lower flange facing plate portion 31 in the plate width direction across the connecting plate portion 33 of the reinforcing member 3, so that their lower regions 21 (21A, 21B) curve away from each other. This allows the amount of concrete around the lower region 21 of the anchor 2 to be secured in each anchor 2, allowing sufficient bearing force to be generated.

In this embodiment, the maximum width dimension w of the anchors 2 (2A, 2B) arranged close to each other in the base length direction D2 in each reinforcing member 3 and the hole distance d between the centers O1 of the anchor through holes 31a in the lower flange opposing plate portion 31 satisfy "w>d/2", so that the anchors 2 (2A, 2B) cannot be erroneously installed so that they are curved to the same side in the base length direction D2, and construction errors can be avoided.

The above describes the embodiments of the present invention in detail with reference to the drawings. However, each configuration and their combination in the above-mentioned embodiments is merely an example, and addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments, but is limited only by the claims.

For example, instead of the pillar 300, a beam may be provided on the upper side of the foundation structure 100 at a position overlapping with the anchor 2 when viewed from the height direction D1.

Furthermore, anchors 2 adjacent to each other in the base length direction D2 do not necessarily have to be curved in opposite directions in the base length direction D2.

The building foundation construction method, the building construction method equipped with the same, and the building foundation structure of the present invention make it possible to build a strong foundation while shortening the construction period.

1... Base body (base)
2 (2A, 2B)...Anchor 3...Reinforcing member 10...Upper flange 11...Lower flange 11a...Anchor insertion hole 12...Web 20 (20A, 20B)...Upper region 21 (21A, 21B)...Lower region 30...Upper flange opposing plate portion 31...Lower flange opposing plate portion 31a...Anchor through hole 32...Web opposing plate portion 33...Connection plate portion 100...Base structure 200...Foundation 205...Rising portion reinforcing bar 210...Rising portion 300...Column 403...Square nut D1...Height direction D2...Base length direction D3...Base width direction G...Base support jig K...Formwork M...Foundation construction surface S...Rising portion region

Claims (7)

A foundation construction method for constructing a foundation for a building, comprising the steps of:
a foundation placement process for placing a foundation above the foundation construction surface extending in a horizontal direction so as to extend in the horizontal direction at a distance from the foundation construction surface, and supporting the foundation on the foundation construction surface by a foundation support jig extending downward from the foundation;
an anchor installation step of installing an anchor on the base so as to extend downward from the base;
A reinforcing bar arrangement process for arranging a rising portion reinforcing bar around the anchor in a rising portion region between the foundation and the foundation construction surface;
A foundation construction process in which a rising portion is formed in the rising portion region by pouring concrete into the rising portion region, the rising portion reinforcing bars and the anchors are embedded in the rising portion, and the rising portion and the base are integrated to construct the foundation;
Equipped with
In the anchor installation step, a J-shaped anchor or an L-shaped anchor is used as the anchor, in which an upper region extends in a height direction and a lower region is curved or bent relative to the upper region, and the anchor is installed so that the lower region is curved or bent from the upper region toward the base length direction, which is the extension direction of the base ,
the base is a structural member having an H-shaped cross section, the structural member being configured by a lower flange in contact with the rising portion, an upper flange disposed above the lower flange, and a web connecting the lower flange and the upper flange;
The present invention further includes a reinforcing step of providing a reinforcing member between the upper flange and the lower flange of the base, the reinforcing member being provided before the anchor installation step.
The reinforcing member is
an upper flange facing plate portion disposed to face the upper flange of the base so as to contact the upper flange from below;
a lower flange facing plate portion disposed to face the lower flange of the base so as to contact the lower flange from above;
a web facing plate portion that connects the upper flange facing plate portion and the lower flange facing plate portion and is disposed to face the web of the base so as to be in contact with the web;
a connecting plate portion that is erected from the web facing plate portion in a plate thickness direction of the web facing plate portion and connects the upper flange facing plate portion and the lower flange facing plate portion at a midpoint in the plate width direction of the upper flange facing plate portion and the lower flange facing plate portion that coincides with the base length direction;
having
The anchor installation process is a foundation construction method for a building, in which the upper region of the anchor is inserted through the lower flange of the foundation and the lower flange opposing plate portion of the reinforcing member, the upper region is fixed to the reinforcing member, and one anchor is installed on each side in the plate width direction, sandwiching the connecting plate portion . A foundation construction method for a building as described in claim 1, wherein the reinforcing process uses a reinforcing member whose plate thickness dimension of the web opposing plate portion is smaller than the plate thickness dimensions of each of the upper flange opposing plate portion and the lower flange opposing plate portion. A foundation construction method for a building as described in claim 1 , wherein the reinforcing process uses a reinforcing member whose plate thickness dimension of the connecting plate portion is smaller than the plate thickness dimensions of each of the upper flange opposing plate portion and the lower flange opposing plate portion. The foundation construction method for a building according to claim 1, wherein in the anchor installation process, the anchors are installed so that the lower regions of the anchors installed on both sides of the lower flange opposing plate portion in the plate width direction, sandwiching the connecting plate portion, are curved or bent away from each other. The lower flange facing plate portion of the reinforcing member has anchor through holes for inserting the anchors therethrough, the anchor through holes being formed on both sides in a plate width direction of the lower flange facing plate portion that coincides with the base length direction across the connecting plate portion,
The distance between the centers of the two anchor through holes is defined as a hole distance d,
When the anchor is installed on the base and viewed from the base width direction, the distance in the base length direction from the center of the upper region to the tip of the lower region of the anchor is defined as the maximum width dimension w of the anchor,
The method for constructing a foundation for a building according to claim 4 , wherein the anchor installation step satisfies w>d/2. The foundation construction method according to any one of claims 1 to 5 ,
A pillar installation process for installing pillars or beams on the upper part of the foundation;
Equipped with
In the reinforcing step, the reinforcing members are provided on both sides of the web, with the web being sandwiched therebetween,
A building construction method in which the pillar installation process involves inserting bolts into the upper flange opposing plate portion of the reinforcing member and the upper flange of the foundation, and fixing the pillar or beam to the foundation with the bolts. A foundation structure that is supported on a horizontally extending foundation construction surface above the foundation construction surface and that contacts a rising part made of concrete erected from the foundation construction surface to form a foundation for a building together with the rising part,
In an installation position where the base is provided on the upper surface of the rising portion, a base body extending in the horizontal direction;
an anchor that is installed on the base body so as to extend downward from the base body in the installation position and is embedded in the rising portion in the installation position to form the foundation;
Equipped with
The anchor in the installation posture is a J-shaped anchor or an L-shaped anchor including an upper region extending in a height direction in the installation posture and a lower region curved or bent toward the base length direction, which is the extension direction of the base body, relative to the upper region ,
the base body is a structural material having an H-shaped cross section, the structural material being composed of a lower flange in contact with the rising portion, an upper flange disposed above the lower flange, and a web connecting the lower flange and the upper flange;
The base body further includes a reinforcing member provided between the upper flange and the lower flange,
The reinforcing member is
An upper flange facing plate portion arranged to face the upper flange of the base body so as to contact the upper flange from below;
A lower flange facing plate portion arranged to face the lower flange of the base body so as to contact the lower flange from above;
a web facing plate portion that connects the upper flange facing plate portion and the lower flange facing plate portion and is disposed opposite to and in contact with the web of the base body;
a connecting plate portion that is erected from the web facing plate portion in a plate thickness direction of the web facing plate portion and connects the upper flange facing plate portion and the lower flange facing plate portion at a midpoint in the plate width direction of the upper flange facing plate portion and the lower flange facing plate portion that coincides with the base length direction;
having
The upper region of the anchor is inserted through the lower flange of the base body and the lower flange facing plate portion of the reinforcing member, and the upper region is fixed to the reinforcing member;
The anchors are foundation structures provided on both sides of the connecting plate portion in the plate width direction .

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