JP2024089731A - Precast spandrel installation method - Google Patents

Abstract

[Problem] To provide a precast waist wall installation method that allows a precast waist wall to be installed before columns and does not require support space on the floor, dirt floor, etc. [Solution] At the top end of a foundation 2, there are two rows of support parts that support a precast waist wall 1 in the extension direction of the foundation 2. The underside of the precast waist wall 1 is supported by the row of support parts on the outdoor side, and the precast waist wall 1 and foundation 2 are connected via a horizontal plate part 13, which is a self-supporting auxiliary member, on the row of support parts on the indoor side, so that the precast waist wall 1 is free-standing on the foundation 2. In addition, the lower part of the precast waist wall 1, the horizontal plate part 13, and the fixing rebar parts for fixing the precast waist wall 1 to the foundation 2 are filled with concrete 100. [Selected Figure] Figure 7

Description

This invention relates to a precast spandrel installation method for attaching a precast spandrel to a foundation.

Patent Document 1 discloses a method of installing a precast concrete waist wall between multiple supports. In this installation method, a fitting groove is formed along the direction of the support arrangement on the upper surface of the foundation that is provided in the direction of the arrangement of multiple supports, on the upper surface outside the supports, a fitting protrusion that fits into the fitting groove is formed on the lower surface of the waist wall, a hook is protruded from the inner surface of the lower part of the waist wall, the upper part of the waist wall and the support have a bolt connection means that connects them, the waist wall is erected by fitting the fitting protrusion at its lower end into the fitting groove, and then the upper part of the waist wall is temporarily fixed to the support by the bolt connection means.

JP 2008-240243 A

However, conventional methods for installing precast waist walls involve temporarily fastening the top of the precast waist wall to the columns with bolt fastening means, which means that the precast waist wall cannot be installed before the columns, limiting the building construction procedure and preventing efficient building construction. One method for installing the precast waist wall before the columns would be to fix the base of the support material that supports the precast waist wall with anchors or single pipes inserted into the first floor floor, the earthen floor, or the ground before the earthen floor is constructed, but this would require securing space for the base of the support material.

The purpose of this invention is to provide a precast spandrel wall installation method that allows the precast spandrel wall to be installed before the columns and does not require support space for the precast spandrel wall on the floor, earthen floor, etc.

The precast waist wall installation method of this invention is characterized in that at least two rows of support sections for supporting the precast waist wall are present on the top edge of the foundation in the extension direction of the foundation, and includes the steps of supporting the underside of the precast waist wall on the support sections of the outdoor row and connecting the precast waist wall to the foundation via self-supporting auxiliary members on the support sections of the indoor row, allowing the precast waist wall to stand on the foundation, and filling the lower part of the precast waist wall, the self-supporting auxiliary members, and the fixing rebar sections for fixing the precast waist wall to the foundation with concrete.

With the above installation method, there is no need to support the precast waist wall with columns, so the precast waist wall can be installed before the columns, making building construction more efficient. In addition, since the precast waist wall stands on the foundation, there is no need to secure support space for the precast waist wall on the floor, dirt floor, etc.

In the above installation method, screw members may be interspersed at the support locations of the outdoor row, and the height of the precast spandrel wall may be adjusted using each screw member.

In the above installation method, the screw member may be a bolt that is screwed into an insert nut embedded in the underside of the precast waist wall. Alternatively, the screw member may be a nut that is screwed into a bolt that protrudes vertically from the top end of the foundation and abuts against the underside of the precast waist wall.

In the above installation method, the self-supporting auxiliary member is composed of a horizontal plate portion that protrudes from the indoor side of the precast waist wall toward the indoor side, and a bolt protruding vertically from the top end side of the foundation on the support part of the indoor row is passed through a hole formed in the horizontal plate portion, and the horizontal plate portion is connected to the top end side of the foundation by upper and lower nuts screwed onto the bolts on the upper and lower sides of the horizontal plate portion, allowing the precast waist wall to stand on its own.

In the above installation method, the precast waist wall is connected to a scaffolding installed near the precast waist wall, and before the additional driving is performed, the upper and lower nuts are temporarily fastened and the scaffolding is used to apply a reaction force to adjust the passage and ingress of the precast waist wall, and after this adjustment, the upper and lower nuts are fully fastened and the additional driving can be performed.

In the above installation method, a hole may be drilled in the top of the foundation above the support portion of the indoor row, an anchor nut may be attached, and the bolt may be attached to the anchor nut, or an anchor bolt may be attached to the hole. Alternatively, when the foundation is made, the bolt may be protruding from the top of the foundation above the support portion of the indoor row.

In the above installation method, the self-supporting auxiliary member is a tubular member that is fixed to the top of the foundation above the support portion of the indoor row, and the precast waist wall can be made to stand on its own by connecting a rod-shaped member inserted into this tubular member to the precast waist wall with a connecting member.

In the above installation method, before the additional pouring is performed, the reaction force is taken by the rod-shaped member, and the connecting member is used to adjust the passage and ingress of the precast spandrel wall, and the additional pouring can be performed after this adjustment.

In the above installation method, a hole may be drilled in the top end of the foundation above the support portion of the indoor row, an anchor nut or an anchor bolt may be attached, and the tubular member may be screwed onto the anchor nut or the anchor bolt. Alternatively, when the foundation is constructed, an anchor nut or an anchor bolt may be provided on the top end of the foundation above the support portion of the indoor row, and the tubular member may be screwed onto the anchor nut or the anchor bolt.

This invention enables efficient building construction by installing precast spandrel walls before the columns, and because the precast spandrel walls stand on their own on the foundations, there is no need to secure support space for the precast spandrel walls on floors, dirt floors, etc.

1A and 1B are diagrams showing a precast spandrel wall of a general section used in the installation method of an embodiment, in which FIG. 1A is a plan view and FIG. 1B is a front view. FIG. 1A is an explanatory diagram showing an intermediate step of the installation method of the embodiment, and FIG. 1B is an enlarged view of a portion of FIG. 1A and 1B are diagrams showing a precast spandrel wall of a column section used in an installation method according to an embodiment, in which FIG. 1A is a plan view and FIG. 1B is a front view. FIG. 11 is an explanatory diagram showing an intermediate process in the column portion of the installation method according to the embodiment. FIG. 11 is an explanatory diagram showing the process of making the precast spandrel wall stand independently according to the installation method of the embodiment. FIG. 11 is an explanatory diagram showing the process of adjusting the passage and ingress of the precast spandrel wall in the installation method of the embodiment. FIG. 1A is an explanatory diagram showing additional construction of general parts in the installation method of the embodiment, and FIG. 1B is an explanatory diagram showing additional construction of column parts in the installation method of the embodiment. FIG. 1A is an explanatory diagram showing an intermediate step of an installation method of another embodiment, FIG. 1B is a plan view of a tubular member, and FIG. 1C is a front view of the tubular member.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the outlines of the precast spandrel wall and the foundation are shown by two-dot chain lines, and the internal reinforcing bars are shown by solid lines.

As shown in Figures 1(A) and 1(B) and Figures 2(A) and 2(B), the precast waist wall 1 used in the construction method of this embodiment has reinforcing bars 11 in a mesh pattern inside. The precast waist wall 1 also has lower horizontal protruding bars 11a whose base side is connected to the reinforcing bars 11 and whose tip side protrudes toward the interior, and upper horizontal protruding bars 11b whose base side is connected to the reinforcing bars 11 and whose tip side protrudes toward the interior. The tips of the horizontal protruding bars 11a and 11b have U-shaped bent parts that are fixed to the reinforcing bar part 21 on the foundation 2 side. The horizontal protruding bars 11a, 11b, and reinforcing bar part 21 form a fixed reinforcing bar part for mutual fixation of the precast waist wall 1 and the foundation 2.

The underside of the precast waist wall 1 is provided with multiple height adjustment parts 12 (for example, two for a 4m precast waist wall 1) spaced apart in the extension direction of the precast waist wall 1. The height adjustment parts 12 consist of an insert nut 12a embedded in the underside of the precast waist wall 1 and a headed screw member 12b screwed into the insert nut 12a. The height of the precast waist wall 1 can be adjusted by adjusting the amount of screwing of the screw member 12b into the insert nut 12a.

Furthermore, multiple vertical plate portions of angle members (for example, four for a 4m-sized precast waist wall 1) are embedded at intervals in the extension direction of the precast waist wall 1 on the lower side of the precast waist wall 1, while the horizontal plate portions 13 of the angle members protrude from the indoor side of the precast waist wall 1 toward the interior as self-supporting auxiliary members. Each horizontal plate portion 13 has a hole 13a formed in the vertical direction.

At the top of the foundation 2, there are two rows of support parts that support the precast waist wall 1 in the extension direction of the foundation 2, with the underside of the precast waist wall 1 being supported by the support parts on the outdoor side, and the precast waist wall 1 being supported to stand upright by the support parts on the indoor side.

In this embodiment, the insert nut 12a and screw member 12b are located on the row of support parts on the outdoor side, and the hole 13a and bolt 24 (described below) are located on the row of support parts on the indoor side.

The precast waist wall 1 is installed on the foundation 2 by supporting the underside of the precast waist wall 1 with screw members 12b at the support points in the row on the outdoor side, and connecting the horizontal plate portion 13, which is a self-supporting auxiliary member, to the top side of the foundation 2 at the support points in the row on the indoor side.

In addition, in this embodiment, bolts 24 protrude vertically from the top of the foundation 2 on the row of support parts on the indoor side, and each bolt 24 passes through each hole 13a, and the horizontal plate portion 13 is fastened to the top side of the foundation 2 by upper and lower nuts screwed onto the bolts 24 on the upper and lower sides of the horizontal plate portion 13.

As shown in Figures 3(A), (B) and 4, the column support part 22 of the foundation 2 on which the column 3 is supported has, for example, a tip bolt part 22a of an anchor bolt protruding from the top surface arranged therein, and the tip bolt part 22a is passed through a through hole formed in the column base part 31 of the column 3, and the column 3 is fixed to the column support part 22 by tightening a nut. The precast waist wall 1 is arranged on the outdoor side of the column 3. In addition, a notch is formed in the lower corner of the end face of the precast waist wall 1 arranged next to the column 3 so as not to interfere with the column support part 22.

In addition, in this construction example, as shown in FIG. 5, holes are drilled in the top edge of the foundation 2 on the row of support parts on the indoor side in a post-construction step, anchor nuts 23 are attached to the holes, and bolts 24 are screwed into the anchor nuts 23.

The precast waist wall 1 is then lifted up by a crane or the like (not shown) and placed on the top side of the foundation 2. During this placement, the bolts 24 are passed through the holes 13a, and the horizontal plate 13 is connected to the top side of the foundation 2 by upper and lower nuts that are screwed onto the bolts 24 on the upper and lower sides of the horizontal plate 13. At this time, the upper and lower nuts are temporarily tightened. Also, in the height adjustment section 12, the height of the precast waist wall 1 is adjusted by adjusting the amount of screwing of the screw member 12b into the insert nut 12a.

After the columns 3 are erected, as shown in Figure 6, the exterior construction scaffolding 90 assembled near the precast waist wall 1 is connected to the fixture 91 fixed to the top of the precast waist wall 1 by a connecting member 92 that allows the inner pipe to be moved inside the outer pipe and allows the spacing to be adjusted, and with the upper and lower nuts temporarily fastened, the exterior construction scaffolding 90 generates a reaction force to adjust the passage and ingress of the precast waist wall 1, and after this adjustment, the upper and lower nuts are fully fastened.

Next, as shown in Figures 7(A) and (B), the lower part of the precast waist wall 1, the horizontal plate portion 13 which is the self-supporting auxiliary member, and the above-mentioned fixing rebar portion (horizontal protruding bar 11a, horizontal protruding bar 11b, rebar portion 21) for fixing the precast waist wall 1 to the foundation 2 are filled with concrete 100.

With this construction method, there is no need to support the precast waist wall 1 with columns 3, so the precast waist wall 1 can be installed before the columns 3, making building construction more efficient. In addition, because the precast waist wall 1 stands on the foundation 2, there is no need to secure support space for the precast waist wall on the floor, dirt floor, etc.

In addition, in the above example, the height adjustment section 12 consists of an insert nut 12a embedded in the underside of the precast waist wall 1 and a headed screw member 12b screwed into the insert nut 12a. This height adjustment mechanism does not require any post-construction drilling of holes in the foundation 2, which improves the efficiency of the installation and construction of the precast waist wall.

Of course, a construction method may be used in which a bolt is left in the foundation 2 as a mechanism for adjusting the height of the precast waist wall 1. For example, a hole is drilled in the top edge of the foundation 2 in post-construction, an anchor nut is attached to the hole, a bolt is screwed into the anchor nut, and the nut is screwed onto the bolt. Meanwhile, a hole is formed in the underside of the precast waist wall 1 to accommodate the bolt. When installing the precast waist wall 1, the bolt can be inserted into the hole and the precast waist wall 1 can be supported by the nut. The height of the precast waist wall 1 can be adjusted by turning the nut.

In the above example, holes are drilled in the top of the foundation 2 on the row of support sites on the indoor side in a post-construction manner, anchor nuts 23 are attached to the holes, and bolts 24 are screwed into the anchor nuts 23. However, the present invention is not limited to this method, and an anchor bolt may be driven into the hole. Furthermore, the present invention is not limited to a method in which such holes are formed in a post-construction manner. For example, when the foundation 2 is constructed, a bolt may be protruding from the top of the foundation 2 on the row of support sites on the indoor side.

(Embodiment 2)
Hereinafter, another embodiment according to one aspect of the present invention will be described with reference to the accompanying drawings. Note that the same members as those shown in the first embodiment will be denoted by the same reference numerals and their description will be omitted. In addition, the following mainly describes the construction parts that are different from the first embodiment, and the steps that are not specifically described here are common to the first embodiment.

As shown in Figure 8 (A), in the construction method of this embodiment, a precast waist wall 1A is used. This precast waist wall 1A does not have a horizontal plate portion 13. In addition, a cylindrical member 5 is fixed to the top end of the foundation 2 on the row of support parts on the indoor side as a self-supporting auxiliary member.

In this example, holes are drilled in the top end of the foundation 2 above the row of support sites on the indoor side in a post-construction process, and anchor nuts 23 are embedded in the holes. As shown in Figures 8 (B) and (C), the tubular member 5 has a bolt portion 51 that protrudes downward from the center of the rectangular bottom plate. This bolt portion 51 is screwed into the anchor nut 23. The upper end of the tubular member 5 is located lower than the height of the concrete to be poured.

Next, a rod-shaped member 52 made of a single pipe or the like is inserted into the tubular member 5. The inserted rod-shaped member 52 is then connected to the precast waist wall 1A by a connecting member 53, allowing the precast waist wall 1A to stand on its own on the top edge of the foundation 2. The height of the connecting member 53 is higher than the height of the concrete to be poured. The connecting member 53, for example, has a movable inner pipe inside the outer pipe to allow for spacing adjustment, and has a single pipe clamp on one side and a screw part on the other side that screws into an insert nut embedded in the inner vertical surface of the precast waist wall 1A.

Next, the rod-shaped member 52 is used to take up the reaction force, and the passage and ingress of the precast spandrel wall 1A is adjusted by adjusting the spacing of the connecting member 53 as described above.

Next, the lower part of the precast waist wall 1A, the tubular member 5 which is the self-supporting auxiliary member, and the above-mentioned fixed rebar section for mutually fixing the precast waist wall 1A and the foundation 2 are filled with concrete 100. If the rod member 52 is inserted with a so-called resin sheath boot loaded into the tubular member 5, the rod member 52 can be easily removed after pouring.

Even with this construction method, there is no need to support the precast waist wall 1A with columns 3, and the precast waist wall 1A can be installed before the columns 3, making it possible to improve the efficiency of building construction. In addition, since the precast waist wall 1A can stand on its own on the foundation 2, there is no need to secure support space for the precast waist wall on the floor, dirt floor, etc.

In the above example, the anchor nut 23 is embedded in the foundation 2 after installation, but this is not limited to the above. For example, a female thread portion is formed in the bottom plate of the tubular member 5, or a nut is welded to match the hole position formed in the bottom plate of the tubular member 5. Then, an anchor bolt (anchor with bolt) may be embedded in the foundation 2 after installation, and the female thread portion or nut of the tubular member 5 may be screwed onto this anchor bolt.

Alternatively, when constructing the foundation 2, an anchor nut or an anchor bolt may be provided at the top end of the foundation 2 on the row of support sites on the indoor side, and the tubular member 5 may be screwed onto the anchor nut or anchor bolt.

In the above example, the support portions are in two rows, but the number is not limited to this. For example, there may be three rows, and the horizontal plate portion (self-supporting support portion) 13 may be supported by two rows of anchor nuts 23 on the indoor side, or the horizontal plate portion (self-supporting support portion) 13 may be supported by one row of anchor nuts 23 on the indoor side, and the rod-shaped member 52 may be supported by another row of anchor nuts 23 on the indoor side.

Although an embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

1: Precast spandrel wall 1A: Precast spandrel wall 2: Foundation 3: Column 5: Cylindrical member (self-supporting part)
11: Reinforcing bar 11a: Horizontal protruding bar 11b: Horizontal protruding bar 12: Height adjustment part 12a: Insert nut 12b: Screw member 13: Horizontal plate part (self-supporting part)
13a: Hole 21: Reinforcing bar 22: Column support 22a: Tip bolt 23: Anchor nut 24: Bolt 31: Column base 51: Bolt 52: Rod-shaped member 53: Connecting member 90: Exterior construction scaffold 91: Fixing device 92: Connecting member 100: Concrete

Claims (12)

A precast waist wall installation method characterized by including a step of supporting the underside of the precast waist wall on the support parts of the outdoor row at the top edge of the foundation in the extension direction of the foundation, connecting the precast waist wall to the foundation via a self-supporting auxiliary member on the support parts of the indoor row, and allowing the precast waist wall to stand on the foundation, and a step of filling the lower part of the precast waist wall, the self-supporting auxiliary member, and the fixing rebar parts for fixing the precast waist wall to the foundation with concrete. The precast spandrel installation method according to claim 1, characterized in that screw members are interspersed at the support locations of the outdoor row, and the height of the precast spandrel is adjusted by each screw member. The precast waist wall installation method according to claim 2, characterized in that the screw member is a bolt that screws into an insert nut embedded in the underside of the precast waist wall. The precast waist wall installation method according to claim 2, characterized in that the screw member is a nut that is screwed onto a bolt that protrudes vertically from the top end of the foundation and abuts against the underside of the precast waist wall. In the precast waist wall installation method described in claim 1, the self-supporting auxiliary member is composed of a horizontal plate portion protruding from the indoor side of the precast waist wall toward the indoor side, and a bolt protruding vertically from the top end side of the foundation on the support part of the indoor side row is passed through a hole formed in the horizontal plate portion, and the horizontal plate portion is connected to the top end side of the foundation by upper and lower nuts screwed onto the bolts on the upper and lower sides of the horizontal plate portion, thereby making the precast waist wall self-supporting. The precast waist wall installation method according to claim 5, characterized in that the precast waist wall is connected to a scaffolding installed near the precast waist wall, and before the additional driving is performed, the upper and lower nuts are temporarily fastened and the scaffolding is used to apply a reaction force to adjust the passage and ingress of the precast waist wall, and after this adjustment, the upper and lower nuts are fully fastened and the additional driving is performed. The precast spandrel installation method according to claim 5 or 6, characterized in that a hole is drilled in the top end of the foundation above the support portion of the indoor row, an anchor nut is attached, and the bolt is attached to the anchor nut, or an anchor bolt is attached to the hole. The precast spandrel installation method according to claim 5 or 6, characterized in that, when the foundation is constructed, the bolts are protruded from the top of the foundation above the support portion of the indoor row. In the precast waist wall installation method described in claim 1, the self-supporting auxiliary member is a cylindrical member fixed to the top end of the foundation above the support portion of the indoor row, and the precast waist wall is made to stand on its own by connecting a rod-shaped member inserted into the cylindrical member to the precast waist wall with a connecting member. The precast spandrel installation method according to claim 9, characterized in that before the additional pouring is performed, the rod-shaped member is used to take the reaction force, and the connecting member is used to adjust the passage and ingress of the precast spandrel, and the additional pouring is performed after this adjustment. The precast spandrel installation method according to claim 9 or 10, characterized in that a hole is drilled in the top end of the foundation above the support portion of the indoor row, an anchor nut or an anchor bolt is attached, and the tubular member is screwed to the anchor nut or the anchor bolt. The precast spandrel installation method according to claim 9 or 10, characterized in that, when the foundation is constructed, an anchor nut or an anchor bolt is provided at the top end of the foundation above the support portion of the indoor row, and the tubular member is screwed to the anchor nut or the anchor bolt.

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