JP2023142340A - Bottom form support structure of descending wall - Google Patents

Abstract

To provide a bottom form support structure capable of simply and inexpensively attaching and supporting the bottom form of a descending wall at a predetermined height position without requiring shoring or scaffolding.SOLUTION: The bottom form support structure includes a plurality of upper metal fittings 11 arranged at intervals in the extending direction of a steel beam 21 where a base end portion 11a is placed on the upper surface of the steel beam 21 and the upper metal fittings 11 are fixed with a tip side portion 11b extending, hanging bolt members 13 whose upper end are fastened to the upper metal fittings 11, a plurality of lower metal fittings 12 provided below each of the upper metal fittings 11 by the lower ends of the hanging bolt members 13 being tightened to the lower metal fittings 12, flap corner members 14 arranged in the extending direction of the steel beam 21 so as to straddle the plurality of lower metal fittings 12 and placed on the lower metal fittings 12 and thereby supported from the steel beam 21 via the hanging bolt members 13 and the upper metal fittings 11, and a bottom formwork 20 laid on the upper surface of the flap corner members 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bottom form support structure for a descending wall, and in particular, when forming a descending wall that is adjacent to the outside of a steel beam and has a bottom portion below the steel beam, the bottom form is supported. The present invention relates to a support structure for supporting the bottom formwork of a descending wall.

In a steel-frame building or a steel-framed reinforced concrete building, a rising wall such as a parapet may be formed by pouring concrete, supported by steel beams arranged around the outer periphery of the building. A parapet is a low rising wall attached to the roof or balcony of a building. In addition, rising walls such as parapets that are supported by steel beams arranged around the outer periphery of buildings are sometimes installed adjacent to the steel beams so as to overhang the outside of the building. The rising wall is formed by pouring concrete on the side of the steel beam as part of the formwork, and includes a falling wall that is installed in the shape of a hanging wall below the top level of the steel beam. It turns out. Since the bottom part of the descending wall is placed below the steel beam, the bottom formwork for pouring concrete to form the descending wall at the bottom of the rising wall must be placed from directly below the installation position. It is necessary to erect shoring and scaffolding to support it from below.

On the other hand, when forming a descending wall at the bottom of a rising wall adjacent to a steel beam, the work of assembling shoring and scaffolding to support the bottom formwork is especially difficult when constructing a descending wall on the upper floor of the building. In some cases, the shoring and scaffolding become large-scale and require a lot of effort, and while the falling wall is curing, it becomes difficult to work under the shoring and scaffolding. . Therefore, for the purpose of solving such technical problems, for example, Patent Document 1 discloses that a horizontal member having a jack bolt at its tip is supported so as to be slidable in the horizontal direction, and A horizontal member support part that can be fixed in position, and a vertical member support that supports vertical members that are equipped with clamps that can be fixed to the flanges of steel beams so that they can freely slide in the vertical direction, and can be fixed in any sliding position. Disclosed is a bottom form frame receiving hardware for a descending wall, which is characterized by being formed by joining two parts in an inverted T-shape.

Utility Model Publication No. 6-43144

The bottom formwork support hardware described in Patent Document 1 makes it possible to eliminate the need to assemble shoring and scaffolding below the bottom formwork, but on the other hand, it is expensive and has a complicated structure. However, since it is difficult to handle during installation, it is possible to create a hanging wall with a simpler and cheaper structure in which the bottom part is placed below the steel beam without requiring large-scale shoring or scaffolding. It is desired to develop a new technology that allows the bottom formwork to be easily supported by attaching it to a predetermined height position.

The present invention enables the bottom formwork of a falling wall, the bottom of which is placed below the steel beam, to be positioned at a predetermined height using a simpler and cheaper structure without requiring large-scale shoring or scaffolding. It is an object of the present invention to provide a bottom formwork support structure for a falling wall that can be easily installed and supported.

The present invention provides a method for forming a falling wall adjacent to the outside of a steel beam and having a bottom portion below the steel beam by pouring concrete into a formwork, so that the bottom formwork is at a predetermined height. a bottom formwork support structure of a descending wall that receives and supports the bottom formwork so as to be installed at a position in which a plurality of falling walls are arranged at predetermined intervals in the extending direction of the steel beam; a plurality of upper metal fittings, each of which is fixed to the upper flange with a portion placed on the upper surface of the upper flange of the steel beam, and with a tip side portion extending outside the steel beam; At least two hanging bolt members whose upper ends are tightened, and the lower ends of these two hanging bolt members are tightened, so that a predetermined interval is provided below each of the upper metal fittings. a plurality of lower metal fittings provided on the steel beam; and a plurality of lower metal fittings that are arranged so as to extend in the extending direction of the steel beam so as to straddle these plurality of lower metal fittings, and placed on the plurality of lower metal fittings. and includes at least two flap angle members supported by the steel beam via the hanging bolt members and the upper hardware, and the bottom formwork laid on the upper surface of the flap angle members. The above objectives are achieved by providing a bottom formwork support structure for the descending walls.

In the bottom formwork support structure for a descending wall of the present invention, the upper metal fitting is attached via a stud bolt member that is pre-attached to protrude from the upper surface of the upper flange of the steel beam before being assembled at the construction site. Preferably, the proximal end portion is fixed to the upper flange of the steel beam by being bolted to the upper surface of the upper flange.

Moreover, in the bottom form support structure for a descending wall of the present invention, it is preferable that the upper hardware and the lower hardware are formed using angle iron.

According to the bottom formwork support structure for a descending wall of the present invention, a descending wall whose bottom portion is located below a steel beam can be constructed with a simpler and cheaper structure without requiring large-scale shoring or scaffolding. The bottom formwork can be easily supported by being attached to a predetermined height position.

FIG. 2 is a cross-sectional view of a main part of the preferred downward wall bottom form support structure of the present invention.

A bottom form support structure 10 for a descending wall according to a preferred embodiment of the present invention shown in FIG. In order to provide a parapet 53, which is a low rising wall, on the outer peripheral part of the balcony part 52 when the balcony part 52 is formed by pouring concrete and supported by a plurality of overhanging steel beams 51 reinforced with This structure was adopted to receive and support the bottom formwork 20. That is, in the present embodiment, the parapet 53 is a head that connects the tips of a plurality of overhanging steel beams 51 arranged at predetermined intervals in a direction perpendicular to the overhang direction (front and back directions of the paper surface of FIG. 1). Below the top level of the connecting steel beams 21, a hanging wall 54 is installed in the shape of a hanging wall. The bottom form 20 used when forming the sloping wall 54 by pouring concrete can be mounted at a predetermined height position using a simple and inexpensive structure without providing support or scaffolding below it. The structure allows for easy support.

As shown in FIG. 1, the bottom formwork support structure 10 of the descending wall of this embodiment is located adjacent to the outside of a steel beam 21 for connecting heads made of, for example, I-shaped steel, and When forming a falling wall 54 having a bottom surface portion 54a at the bottom by pouring concrete into a formwork, the bottom formwork 20 is received so that the bottom formwork 20 is installed at a predetermined height position. A supporting structure for supporting the steel beam 21, which is arranged in plurality at predetermined intervals in the extending direction of the steel beam 21 (front and back directions in the paper surface of FIG. A plurality of upper metal fittings 11 are placed on the upper metal fittings 11 and are fixed to the upper flange 21a with the tip side portion 11b extending outside the steel beam 21, and the upper end portion is fastened to each of the upper metal fittings 11. At least two hanging bolt members 13 each, and the lower ends of each of these two hanging bolt members 13 are tightened, so that a plurality of hanging bolt members 13 provided at a predetermined interval below each upper hardware 11 are provided. The lower hardware 12 is arranged to extend in the extending direction of the steel beam 21 (the front and back direction of the paper in FIG. 1) so as to straddle these multiple lower hardware 12, and At least two Bata corner members 14 are placed on top and supported by the steel beams 21 via the hanging bolt members 13 and the upper hardware 11, and a bottom formwork is laid on the upper surface of the Bata corner members 14. 20.

Furthermore, in this embodiment, the base end portion 11a of the upper hardware 11 is attached to the steel frame via the stud bolt member 15 that is attached in advance and protrudes from the upper surface of the upper flange 21a of the steel beam 21 before being assembled at the construction site. The upper hardware 11 is fixed to the upper flange 21a by being bolted to the upper surface of the upper flange 21a of the beam 21.

In this embodiment, the upper metal fittings 11 constituting the bottom form support structure 10 are preferably made of L-100 x 100 x 10 angle steel, and are arranged in plural at predetermined intervals in the extending direction of the steel beams 21. has been done. When each upper hardware 11 is placed on the upper surface of the upper flange 21a of the steel beam 21 for head connection made of I-shaped steel in a direction perpendicular to the extending direction thereof, the base end portion 11a is placed. In addition, the distal end portion 11b has a length that allows the distal end portion 11b to protrude outward from the upper flange 21a by a protruding length of, for example, about 200 to 300 mm. The stud bolt members 15 previously attached to the upper surface of the upper flange 21a of the steel beam 21 are inserted into the fastening holes formed in the base end portions 11a of the upper metal fittings 11, respectively, and the nut members 15a are inserted. By using and tightening the bolts, the distal end portion 11b is firmly fixed to the steel beam 21 by bolt connection with the distal end portion 11b projecting outward. A fastening hole for fastening a hanging bolt member 13, which will be described later, is also formed in the tip side portion 11b.

The hanging bolt member 13 is made of a long bolt having a thickness of, for example, M12, with male threads formed at least on both ends, and the upper end is the tip of the upper metal fitting 11 projecting outside the steel beam 21. It is inserted from below into a fastening hole formed in the side portion 11b, and is fastened to the upper hardware 11 from above using a nut member 13a. In this embodiment, two hanging bolt members 13 are fastened and latched to each of a plurality of upper metal fittings 11 arranged at predetermined intervals in the extending direction of the steel beam 21 so as to be suspended. It has become. A lower metal fitting 12 is fastened and attached to the lower end of each pair of hanging bolt members 13 in a region below the lower flange 21b of the steel beam 21.

The lower hardware 12 attached to the lower end of the hanging bolt member 13 is preferably made of angle steel similar to the upper hardware 11, and is suspended via the hanging bolt member 13, so that the lower hardware 12 is attached to the lower end of each upper hardware 11. It will be attached as a pair with the upper hardware 11. A fastening hole is formed in the lower hardware 12 at a position corresponding to a fastening hole formed in the distal end portion 11b of the upper hardware 11. The lower end portion of the hanging bolt member 13 is inserted into this fastening hole from above, and the lower end portion is fastened and locked to the lower hardware 12 from below using a nut member 13a. As a result, the plurality of lower hardware 12 is suspended from each upper hardware 11 and is disposed below the lower flange 21b of the steel beam 21, and at a predetermined interval in the extending direction of the steel beam 21. It will be placed after. The height position of the lower hardware 12 can be adjusted with high accuracy by appropriately rotating the nut member 13a and moving the screwing position of the lower end of the hanging bolt member 13 up and down.

In this embodiment, at least two battens are installed so as to straddle a plurality of lower metal fittings 12 which are arranged at predetermined intervals in the extending direction of the steel beam 21 and whose height positions are adjusted. The corner members 14 (two in this embodiment) preferably have a square cross-sectional shape, are preferably made of wooden or hollow metal square members, and are arranged to extend parallel to the extending direction of the steel beam 21. At the same time, they are placed on the plurality of lower metal fittings 12 side by side at intervals from each other. As a result, the two flap angle members 14 are attached while being supported by the steel beam 21 via the suspension bolt members 13 and the upper hardware 11. In addition, in this embodiment, auxiliary square members 16 are provided on both sides of the two flap corner members 14 to ensure that the bottom formwork 20 is laid on the upper surface of the flap corner members 14 in a more stable state. 21 and is installed so as to extend parallel to the direction in which it extends.

The bottom formwork 20 laid on the upper surface of the flap corner member is made of, for example, plywood for a formwork cut into a strip shape. The bottom formwork 20 is formed to have a width spanning the auxiliary square members 16 on both sides, and is supported by the two flap corner members 14 and the auxiliary square members 16 so that the longitudinal direction is in the direction in which the steel beams 21 extend. It is laid at a predetermined height position. Further, in this embodiment, since the bottom part 54a of the descending wall 54 is formed one step higher on the lower floor structure 50 side, the bottom part 54a of the descending wall 54 is formed into a bottom shape supported by the two flap corner members 14 and the auxiliary corner members 16. On the lower floor part of the frame 20 on the side of the structure 50, a step bottom form 20' is laid at a position one step higher than the bottom form 20, supported by a pair of auxiliary square members 16. There is.

Once the bottom formwork support structure 10 for the descending wall of this embodiment is formed as described above, it is erected from the bottom formwork 20, and the outer side formwork 55 of the parapet 53 portion including the descending wall 54 is attached. , the bottom formwork 56 of the balcony section 52 is attached, and concrete is poured to the height of the bottom surface of the drainage ditch 57. After the poured concrete has hardened, the hardened concrete is erected and the inner side formwork 58 of the parapet 53 part and the inner side formwork 59 of the drainage ditch 57 are attached, and then the rising part of the parapet 53 and the balcony part 52 are installed. Pour concrete for the slab section.

Furthermore, once the poured concrete has hardened, the nut member 13a screwed onto the lower end of the hanging bolt member 13 is removed to release the locked state of the lower hardware 12. The auxiliary square beam 16, the bottom formwork 20, and the step bottom formwork 20' are removed. The lower end portion of the hanging bolt member 13 left behind with the hanging wall 54 protruding downward from the bottom portion 54a is cut and removed, and the concrete surface of the bottom portion 54a is repaired. The remaining suspension bolt members 13, upper hardware 11, nut members 13a, 15a, and stud bolt members 15 are left in the concrete.

According to the lower wall bottom form support structure 10 of the present embodiment having the above-described configuration, the bottom part 54a is formed by a steel beam with a simpler and cheaper configuration without requiring large-scale shoring or scaffolding. The bottom formwork 20 of the descending wall 54 disposed below the wall 21 can be easily supported by being attached to a predetermined height position.

That is, according to the present embodiment, the plurality of upper metal fittings 11 are fixed to the upper flange 21a with the distal end portion 11b extending outside the steel beam 21, and the upper end portion is fastened to each of the upper metal fittings 11. The hanging bolt members 13 to be attached, the plurality of lower hardware 12 that are fastened and locked to the lower ends of these hanging bolt members 13, and the plurality of lower hardware 12 are placed so as to straddle the suspension bolt members 13, Since it consists of a batten corner member 14 supported from a steel beam 21 via bolt members 13 and upper hardware 11, and a bottom formwork 20 laid on the top surface of the batta corner member 14, large-scale shoring and scaffolding are required. It becomes possible to easily and inexpensively attach the bottom formwork 20 of the lower wall 54 to a predetermined height position and support it easily.

Note that the present invention is not limited to the above embodiments, and various changes can be made. For example, the upper hardware does not necessarily need to be fixed to the upper flange via a stud bolt member previously attached to the upper surface of the upper flange of the steel beam, and may be fixed by other fixing means. The upper hardware and the lower hardware may be formed using channel steel or other various steel materials other than angle iron.

10 Lowering wall bottom form support structure 11 Upper hardware 11a Proximal part 11b Tip end part 12 Lower hardware 13 Hanging bolt member 13a Nut member 14 Butterfly corner member 15 Stud bolt member 15a Nut member 16 Auxiliary square member 20 Bottom form 20 ' Step bottom form 21 Steel beam 21a Upper flange 21b Lower flange 50 Lower floor structure 51 Overhanging steel beam 52 Balcony section 53 Parapet (standing wall)
54 Downward wall 54a Bottom part 55 Outer side formwork 56 Bottom formwork 57 Drainage grooves 58, 59 Inner side formwork

Claims (3)

When forming a falling wall adjacent to the outside of a steel beam and having a bottom portion below the steel beam by pouring concrete into the formwork, the bottom formwork is installed at a predetermined height position. A bottom formwork support structure of a descending wall that receives and supports the bottom formwork as shown in FIG.
A plurality of steel beams are arranged at predetermined intervals in the extending direction of the steel beam, the proximal end portion is placed on the upper surface of the upper flange of the steel beam, and the distal end portion is extended to the outside of the steel beam. a plurality of upper metal fittings fixed to the upper flange in a state in which the upper metal fittings are fixed to the upper flange; at least two hanging bolt members whose upper ends are fastened to each of the upper fittings; and lower end portions of each of these two hanging bolt members. By tightening, a plurality of lower metal fittings are provided below each of the upper metal fittings at a predetermined interval, and a plurality of lower metal fittings extend in the extending direction of the steel beam so as to straddle these plurality of lower metal fittings. at least two flap angle members that are placed on top of the plurality of lower metal fittings and are supported by the steel beam via the hanging bolt member and the upper metal fitting; A bottom form support structure for a descending wall, including the bottom form laid on the upper surface of the flap corner member. The upper hardware is connected to the upper surface of the upper flange of the steel beam by way of a stud bolt member which is attached in advance and protrudes from the upper surface of the upper flange of the steel beam before being assembled at the construction site. The bottom form support structure for a descending wall according to claim 1, wherein the bottom form support structure for a descending wall is fixed to the upper flange by being bolted to the upper flange. The bottom form support structure for a descending wall according to claim 1 or 2, wherein the upper metal fittings and the lower metal fittings are formed using angle iron.

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