Bottom formwork support structure for lowered walls

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

[Technical Field]

[0001] The present invention relates to a bottom formwork support structure for a hanging wall, and in particular to a bottom formwork support structure for a hanging wall that receives and supports a bottom formwork when forming a hanging wall adjacent to the outside of a steel beam and having a bottom portion below the steel beam. [Background technology]

[0002] In steel-framed or steel-reinforced concrete buildings, rising walls such as parapets are sometimes formed by pouring concrete and supported by steel beams located around the building's perimeter. Parapets are low rising walls attached to building roofs, balconies, and the like. Furthermore, rising walls such as parapets supported by steel beams located around the building's perimeter may be installed adjacent to and protruding from the steel beams. In such cases, the rising wall, formed by pouring concrete using the sides of the steel beams as formwork, includes a drop wall installed below the top of the steel beam in a hanging-like shape. Because the bottom of the drop wall is located below the steel beam, the bottom formwork used to pour concrete to form the drop wall below the rising wall requires support from below by assembling shoring or scaffolding directly below its installation position.

[0003] On the other hand, when a drop wall is formed adjacent to a steel beam at the bottom of a rising wall, the work of assembling shoring and scaffolding to support the bottom formwork, especially when constructing a drop wall on an upper floor of a building, requires a lot of time and effort due to the large-scale shoring and scaffolding required, and it becomes difficult to perform work below the drop wall while it is being cured due to the shoring and scaffolding. Therefore, in order to solve these technical problems, for example, Patent Document 1 discloses a bottom formwork support bracket for a drop wall, which is characterized by comprising: a horizontal member support part that supports a horizontal member with a jack bolt at its tip so that it can slide horizontally and be fixed in any sliding position; and a vertical member support part that supports a vertical member with a clamp that fastens to the flange of a steel beam so that it can slide vertically and be fixed in any sliding position, joined in an inverted T shape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-43144 Summary of the Invention [Problem to be solved by the invention]

[0005] The bottom formwork support hardware described in Patent Document 1 makes it possible to eliminate the need to assemble shoring or scaffolding below the bottom formwork, but on the other hand, it is expensive and has a complex structure, and is also difficult to handle when installing. Therefore, there is a need for the development of a new technology that uses a simpler, less expensive configuration to easily install and support the bottom formwork of a dropped wall, whose bottom portion is positioned below the steel beams, at a specified height, without the need for large-scale shoring or scaffolding.

[0006] To provide a support structure for a bottom formwork of a hanging wall that can easily support the bottom formwork of a hanging wall, the bottom surface of which is located below a steel beam, by attaching it to a predetermined height position with a simpler and cheaper configuration without requiring large-scale shoring or scaffolding. [Means for solving the problem]

[0007] The present invention relates to a bottom form support structure for a hanging wall that receives and supports a bottom form so that the bottom form is set at a predetermined height when forming a hanging wall adjacent to the outside of a steel beam and having a bottom surface portion below the steel beam by pouring concrete into a form, the bottom form being located at a predetermined height. The bottom form support structure includes a plurality of upper metal fittings arranged at predetermined intervals in the extension direction of the steel beam, with base end portions placed on the upper surface of the upper flange of the steel beam and tip end portions fixed to the upper flange in a state where they protrude outward from the steel beam, and at least two hanging bolt members each having upper ends fastened to each of the upper metal fittings. The above-mentioned object has been achieved by providing a bottom formwork support structure for a hanging wall, which is composed of a plurality of lower metal fittings that are arranged at a predetermined interval below each of the upper metal fittings by fastening the lower ends of each of the two hanging bolt members, at least two flap corner members that are arranged extending in the extension direction of the steel beam so as to straddle these plurality of lower metal fittings and are placed on top of the plurality of lower metal fittings, and are supported by the steel beam via the hanging bolt members and the upper metal fittings, and the bottom formwork that is laid on the upper surface of the flap corner members.

[0008] Furthermore, in the bottom formwork support structure for a drop wall of the present invention, it is preferable that the upper metal fittings are fixed to the upper flange by bolting the base end portion to the upper surface of the upper flange of the steel beam via a stud bolt member that is pre-attached and protrudes from the upper surface of the upper flange of the steel beam before assembly at the construction site.

[0009] In addition, in the bottom formwork support structure for a dropped wall of the present invention, it is preferable that the upper metal fittings and the lower metal fittings are formed using angle irons. [Effects of the Invention]

[0010] According to the bottom formwork support structure for a drop wall of the present invention, the bottom formwork of a drop wall, whose bottom portion is positioned below the steel beam, can be easily attached and supported at a predetermined height position with a simpler and cheaper configuration without requiring large-scale shoring or scaffolding. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of a main part illustrating a preferred configuration of a bottom formwork support structure for a hanging wall according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The bottom formwork support structure 10 for a dropped wall according to a preferred embodiment of the present invention shown in Figure 1 is supported by a plurality of overhanging steel beams 51, preferably reinforced with diaphragms, that are installed to overhang from a structure 50 on the lower floor in a steel-framed or steel-reinforced concrete building, and is adopted as a structure that receives and supports the bottom formwork 20 for providing a parapet 53, which is a low rising wall, around the outer periphery of a balcony section 52 when the balcony section 52 is formed by pouring concrete. That is, in this embodiment, the parapet 53 is provided with a hanging wall 54 that is installed in a hanging wall-like shape below the top end level of the connecting steel beams 21 that connect the tip ends of multiple overhanging steel beams 51 arranged at a predetermined interval in a direction perpendicular to the overhanging direction (the front-to-back direction of the paper in Figure 1), and the bottom formwork support structure 10 of this embodiment is designed to allow the bottom formwork 20, which is used to form such a hanging wall 54 by pouring concrete, to be easily attached and supported at a predetermined height position with a simple and inexpensive configuration without the need for shoring or scaffolding below it.

[0013] The bottom formwork support structure 10 for the drop wall of this embodiment is a support structure that receives and supports the bottom formwork 20 so that the bottom formwork 20 is installed at a predetermined height when forming a drop wall 54 adjacent to the outside of a head-connecting steel beam 21 made of, for example, an I-beam and having a bottom surface portion 54a below the steel beam 21 by pouring concrete into the formwork, as shown in FIG. 1 , and includes a plurality of bottom formworks arranged at predetermined intervals in the extension direction of the steel beam 21 (the front-to-back direction of the paper in FIG. 1 ), with base end portions 11a placed on the top surfaces of the upper flanges 21a of the steel beams 21 and tip end portions 11b fixed to the upper flanges 21a in a state where they protrude outward from the steel beams 21. The structure comprises upper metal fittings 11, at least two hanging bolt members 13 each having their upper ends fastened to each upper metal fitting 11, a plurality of lower metal fittings 12 each having their lower ends fastened to the two hanging bolt members 13, which are arranged at predetermined intervals below each upper metal fitting 11, at least two flap corner members 14 which are arranged extending across the plurality of lower metal fittings 12 in the extension direction of the steel beam 21 (the front and back direction of the paper in Figure 1) and are placed on the plurality of lower metal fittings 12, so as to be supported by the steel beam 21 via the hanging bolt members 13 and upper metal fittings 11, and a bottom formwork 20 which is laid on the top surface of the flap corner members 14.

[0014] In addition, in this embodiment, the upper hardware 11 is fixed to the upper flange 21a by bolting the base end portion 11a to the upper surface of the upper flange 21a of the steel beam 21 via a stud bolt member 15 that is pre-attached and protrudes from the upper surface of the upper flange 21a of the steel beam 21 before assembly at the construction site.

[0015] In this embodiment, the upper metal fittings 11 constituting the bottom formwork support structure 10 are preferably made of L-100 x 100 x 10 angle irons, and are arranged at predetermined intervals in the extension direction of the steel beams 21. When the base end portion 11a of each upper metal fitting 11 is positioned in a direction perpendicular to the extension direction and placed on the upper surface of the upper flange 21a of the steel beam 21 used for connecting the head, which is made of an I-beam, the length of each upper metal fitting 11 enables the tip end portion 11b to protrude outward from the upper flange 21a by a protrusion length of, for example, approximately 200 to 300 mm. Each upper metal fitting 11 is firmly fixed to the steel beam 21 by bolt connection with the tip end portion 11b protruding outward by inserting a stud bolt member 15 previously attached to the upper surface of the upper flange 21a of the steel beam 21 into a fastening hole formed in the base end portion 11a and tightening the stud bolt member 15a using a nut member 15a. The tip end portion 11b also has a fastening hole for fastening a suspension bolt member 13, which will be described later.

[0016] The suspension bolt members 13 are long bolts having male threads formed on at least both ends and having a thickness of, for example, about M12, and their upper ends are inserted from below into fastening holes formed in the tip portions 11b of the upper hardware 11 that protrude outward from the steel beam 21, and are fastened and engaged to the upper hardware 11 from above using nut members 13a. In this embodiment, two suspension bolt members 13 are fastened and engaged to each of a plurality of upper hardware 11 arranged at predetermined intervals in the extension direction of the steel beam 21, and are suspended. A lower hardware 12 is fastened and engaged to the lower ends of each pair of suspension bolt members 13 in an area below the lower flanges 21b of the steel beam 21.

[0017] The lower hardware 12 attached to the lower end of the hanging bolt member 13 is preferably made of angle iron similar to the upper hardware 11, and is attached in pairs to the upper hardware 11 directly below each upper hardware 11 while suspended via the hanging bolt member 13. Fastening holes are formed in the lower hardware 12 at positions corresponding to fastening holes formed in the tip portion 11b of the upper hardware 11. The lower end of the hanging bolt member 13 is inserted into this fastening hole from above, and the lower end is fastened and engaged to the lower hardware 12 from below using a nut member 13a. As a result, the multiple lower hardware 12, while suspended from each upper hardware 11, are positioned below the lower flange 21b of the steel beam 21 and at predetermined intervals in the extension direction of the steel beam 21. The height position of the lower metal fitting 12 can be adjusted with precision by appropriately rotating the nut member 13a to move the screw-fitting position at the lower end of the suspension bolt member 13 up and down.

[0018] In this embodiment, at least two flap angle members 14 (two in this embodiment) are arranged at a predetermined interval in the extension direction of the steel beams 21 and are installed so as to straddle a plurality of lower metal fittings 12 whose height positions are adjusted. Each of these members preferably has a square cross-section and is preferably made of wooden or hollow metal square timber. The members are arranged to extend parallel to the extension direction of the steel beams 21 and are placed side by side at intervals on the plurality of lower metal fittings 12. As a result, the two flap angle members 14 are attached in a state where they are supported by the steel beams 21 via the hanging bolt members 13 and the upper metal fittings 11. In this embodiment, auxiliary square timbers 16 are attached to both sides of the two flap angle members 14, extending parallel to the extension direction of the steel beams 21, so that the bottom formwork 20 can be laid on the top surface of the flap angle members 14 in a more stable manner.

[0019] The bottom formwork 20, which is laid on the top surface of the flap angle members, is made of formwork plywood cut into a strip shape, for example. The bottom formwork 20 is formed to have a width spanning the auxiliary beams 16 on both sides, and is laid at a predetermined height with its longitudinal direction aligned with the extension direction of the steel beams 21, supported by the two flap angle members 14 and the auxiliary beams 16. In this embodiment, the bottom surface 54a of the lowering wall 54 is formed one step higher on the side facing the structure 50 of the lower floor. Therefore, a step-part bottom formwork 20' is laid one step higher than the bottom formwork 20, supported by a pair of auxiliary beams 16, on top of the portion of the bottom formwork 20, which is supported by the two flap angle members 14 and the auxiliary beams 16, facing the structure 50 of the lower floor.

[0020] After the bottom formwork support structure 10 for the dropping wall of this embodiment has been formed as described above, it is erected from the bottom formwork 20, and outer surface formwork 55 for the parapet 53 portion including the dropping wall 54 is attached, and bottom surface formwork 56 for the balcony portion 52 is attached, and concrete is poured up to the height of the bottom of the drainage ditch 57. Once the poured concrete has hardened, it is erected from the hardened concrete, and inner surface formwork 58 for the parapet 53 portion and inner surface formwork 59 for the drainage ditch 57 are attached, and then concrete is poured for the rising portion of the parapet 53 and the slab portion of the balcony portion 52.

[0021] Once the poured concrete has hardened, the nut members 13a threaded onto the lower ends of the hanging bolt members 13 are removed, releasing the lower hardware 12 and removing the lower hardware 12, the flap corner members 14, the auxiliary square beams 16, the bottom formwork 20, and the step bottom formwork 20'. The lower ends of the hanging bolt members 13, which remain with the hanging wall 54 protruding downward from the bottom surface 54a, are cut and removed, and the concrete surface of the bottom surface 54a is repaired. The remaining hanging bolt members 13, upper hardware 11, nut members 13a and 15a, and stud bolt members 15 are left in the concrete.

[0022] Furthermore, according to the bottom formwork support structure 10 for the hanging wall of this embodiment, which has the above-mentioned configuration, it is possible to easily support the bottom formwork 20 of the hanging wall 54, whose bottom portion 54a is positioned below the steel beam 21, by attaching it to a predetermined height position with a simpler and cheaper configuration, without requiring large-scale shoring or scaffolding.

[0023] In other words, according to this embodiment, the structure comprises a plurality of upper metal fittings 11 fixed to the upper flange 21a with their tip portions 11b extending outward from the steel beam 21, hanging bolt members 13 whose upper ends are fastened to each of the upper metal fittings 11, a plurality of lower metal fittings 12 fastened and engaged to the lower ends of these hanging bolt members 13, a flap corner member 14 placed across the plurality of lower metal fittings 12 and supported from the steel beam 21 via the hanging bolt members 13 and upper metal fittings 11, and a bottom formwork 20 laid on the top surface of the flap corner member 14. This makes it possible to easily and inexpensively attach the bottom formwork 20 of the down wall 54 to a predetermined height position and support it easily without the need for large-scale shoring or scaffolding.

[0024] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the upper metal fittings do not necessarily need to be fixed to the upper flange of the steel beam via stud bolt members pre-attached to the upper surface of the upper flange, but may be fixed by other fixing means. The upper metal fittings and lower metal fittings may be formed using channel steel or various other steel materials other than angle iron. [Explanation of symbols]

[0025] 10. Bottom formwork support structure for drop wall 11 Upper hardware 11a Proximal part 11b Tip side part 12 Lower hardware 13 Hanging bolt member 13a Nut member 14 Butterfly corner members 15 Stud bolt material 15a Nut member 16 Auxiliary beam 20 Bottom formwork 20' bottom formwork for step section 21 Steel beam 21a Upper flange 21b Lower flange 50 Lower Floor Structure 51 Cantilevered steel beam 52 Balcony section 53 Parapet (rising wall) 54 Drop Wall 54a Bottom part 55 Exterior formwork 56 Bottom formwork 57 Drain 58,59 Inner side formwork

Claims

1. A bottom formwork support structure for a hanging wall that supports a bottom formwork so that the bottom formwork is installed at a predetermined height position below the steel beams when forming the hanging wall adjacent to the outside of the steel beams arranged on the periphery of a building by pouring concrete into the formwork, the bottom formwork being located adjacent to the outside of the steel beams and having a bottom portion below the steel beams, a plurality of upper metal fittings arranged at predetermined intervals in the extension direction of the steel beams, with their base end portions placed on the upper surfaces of the upper flanges of the steel beams and their tip ends extending outward from the steel beams at the outer periphery of the building, and with the base end portions fixed to the upper flanges; at least two hanging bolt members each having their upper ends fastened to the tip portions of the upper metal fittings that extend outward; a plurality of lower metal fittings to which the lower ends of the at least two hanging bolt members are fastened, and which are arranged at predetermined intervals below the tip portions of the upper metal fittings that extend outward; at least two flap corner members arranged to extend across the plurality of lower metal fittings in the extension direction of the steel beams and placed on top of the plurality of lower metal fittings, and which are supported by the steel beams via the hanging bolt members and the upper metal fittings; and the bottom formwork supported on the upper surface of the flap corner members.

2. The bottom formwork support structure for a drop wall as described in claim 1, wherein the upper metal fittings are fixed to the upper flange by bolting the base end portion to the upper surface of the upper flange of the steel beam via a stud bolt member that is pre-attached and protrudes from the upper surface of the upper flange of the steel beam before assembly at the construction site.

3. 3. The bottom formwork support structure for a drop wall according to claim 1, wherein the upper metal fittings and the lower metal fittings are formed using angle irons.

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