JP6653214B2 - Parapet structure using precast concrete members - Google Patents

Description

  The present invention relates to a parapet structure using a precast concrete member.

  It is common to construct parapets on the rooftop of a building along its outer periphery. A parapet is an important member that plays a role of waterproofing a rooftop, protecting an end portion, a handrail, and the like, and various proposals have been made on its structure and construction method. Further, in order to reduce the labor of construction and reduce the cost, a technique of precasting a parapet has been proposed (see Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

  The technique described in Patent Literature 1 relates to a precast concrete plate for a balcony in which a heat insulating material such as styrofoam is provided on a joint end face, and connecting bars and shear reinforcing bars protrude from the joint end face. By using such a precast concrete plate for a balcony, the heat insulation performance and the bonding strength to the frame can be increased, and the external heat insulation of the parapet can be efficiently performed.

  According to the technique described in Patent Document 2, a floor slab and a parapet portion rising from one end of the floor slab are integrally formed to obtain a precast slab for a roof. In addition, the upper end surface of the parapet portion is a sloped surface descending to the floor slab portion, and the side surface of the parapet portion on the floor slab portion side is integrally formed with a ridge along the upper edge thereof, and the lower surface of the ridge is formed. Is provided with a draining groove along its base end. With such a configuration, the rainwater that has fallen on the upper end surface of the parapet portion flows toward the floor slab portion and reaches the protrusion on the upper end edge of the side surface of the parapet portion on the floor slab portion. It is said that the water does not flow down the side surface of the parapet due to the drain groove on the lower surface, but flows down directly from the ridge onto the floor slab.

  In the technique described in Patent Document 3, concrete is cast on the roof floor of a steel-framed building while leaving its outer peripheral portion, and then an ALC plate as an outer peripheral wall made of precast concrete is attached to the top floor of the building. Then, a parapet made of precast concrete is placed so as to overlap the upper side of the ALC plate, and the parapet and the perimeter of the cast-in-place rooftop concrete are joined by welding of reinforcing steel and concrete.

  The technology described in Patent Literature 4 produces a precast concrete rooftop parapet in which a connecting reinforcing bar protrudes from a base at a site, and arranges the precast concrete rooftop parapet in an appropriate position on a skeleton frame at the top of the skeleton. Then, the connecting reinforcing bars are connected to the reinforcing bars of the skeleton, and are integrated with the skeleton when the concrete of the skeleton is poured.

JP-A-2002-339451 JP-A-10-237964 JP-A-6-108557 JP-A-5-156706

  By the way, on the top floor (rooftop) of a building, there are various restrictions on the fitting of the main reinforcement of the column member and the main reinforcement of the beam member. For example, since the fixing plate cannot be used for the first step of the beam member on the top floor, the tail section of the first step must be bent down. When the bending down length is secured, it is necessary to go around the top end of the column member, and it is not possible to perform precasting. In this regard, by extending the main reinforcement of the column member to the same height as the parapet, the fixing can be performed using the fixing plate without bending down the tail portion of the beam main reinforcement (first-stage reinforcement).

  Therefore, by avoiding various restrictions on the main reinforcement of the column member and the main reinforcement of the beam member on the top floor of the building, and by precasting the parapet, the construction of the building can be performed efficiently and the cost can be reduced. .

  As described above, the technique proposed in the related art mentions the precasting of the parapet, but does not mention various points to avoid various restrictions on the fitting between the main reinforcement of the column member and the main reinforcement of the beam member. No disclosure or suggestion.

  Further, in a high-rise building, there is a restriction on the weight and strength of the scaffold, and it is not realistic to use a continuous scaffold from the lower floor to the upper floor outside the building. Therefore, it is common to use a temporary scaffold composed of a suspended scaffold or the like, but it is necessary to construct a parapet on the top floor (roof), and a device for attaching the suspended scaffold is required. That is, on the top floor of a building, there is a demand for development of a technique for achieving both a construction work of a parapet and a suspension work of a hanging scaffold.

  The present invention has been proposed in view of the above-described circumstances, and aims to improve construction efficiency by avoiding various restrictions on the fitting of the main reinforcement of the column member and the main reinforcement of the beam member and precasting the parapet. It is an object of the present invention to provide a parapet structure using a precast concrete member capable of reducing the construction cost.

  A parapet structure using a precast concrete member according to the present invention has been proposed in view of the above-described circumstances, and has the following features. That is, the parapet structure using the precast concrete member according to the present invention, while extending the column reinforcement of the stigma to the same height as the parapet, and a column member on the top floor where a fixing plate is attached to the tail of the column reinforcement, It is characterized by comprising a beam member on the top floor having a fixing plate attached to the tail portion of the main muscle, and a precast concrete parapet attached above the column member and the beam member.

  Further, in addition to the above-described configuration, the parapet can be configured to include a mounting member for a temporary scaffold mounted on the outside of the building.

  Further, in addition to the above-described configuration, the parapet can be composed of a column-shaped parapet mounted on the upper portion of the column member and a beam upper parapet mounted on the upper portion of the beam member.

  Further, in addition to the above-described configuration, it is possible to provide a configuration including a temporary support portion that temporarily supports the parapet with respect to the fixing member fixed to the roof.

  ADVANTAGE OF THE INVENTION According to the parapet structure using the precast concrete member which concerns on this invention, by extending the column stirrup of a stigma to the height equivalent to a parapet, a fixing plate does not bend down the tail part of a beam main bar (first step bar). Can be used for fixing. Further, since various restrictions on the fit between the main reinforcement of the column member and the main reinforcement of the beam member are avoided, it is possible to precast the parapet. By precasting the parapet, it is possible to improve construction efficiency and reduce construction costs.

  In addition, by providing the attachment member for the temporary scaffold (suspension scaffold) on the parapet, it is possible to achieve both the construction work of the parapet and the suspension work of the suspension scaffold on the top floor of the building.

Explanatory drawing which shows the structure of the parapet structure (column-shaped part parapet) using the precast concrete member which concerns on embodiment of this invention. Explanatory drawing which shows the structure of the parapet structure (beam upper parapet) using the precast concrete member which concerns on embodiment of this invention.

  Hereinafter, a parapet structure using a precast concrete member according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 illustrate a parapet structure using a precast concrete member according to an embodiment of the present invention. FIG. 1 is an explanatory diagram showing a structure of a column-shaped parapet, and FIG. FIG. 1 and 2 show the internal structure of the parapet structure viewed from the side.

<Overview of Parapet Structure>
In the parapet structure according to the embodiment of the present invention, a parapet is produced from a precast concrete member, and the parapet is adopted for a roof part of a building, and the main bar of a column member and the main bar of a beam member which exist in the related art. This avoids various restrictions on the fit. That is, the parapet structure according to the embodiment of the present invention uses a parapet made of a precast concrete member in consideration of the fit between the main bar of the column member and the main bar of the beam member.

<Column members>
The column member 10 on the top floor has the column bar 11 of the column capital extended to the same height as the parapet (column type parapet 30), and the fixing plate 12 is attached to the tail (end) of the column bar 11. . That is, in the pillar member 10 on the top floor, the pillar 11 of the capital is extended to a height that can be accommodated in the inner recess 31 of the pillar-shaped parapet 30, and the tail (end) of the pillar 11 of the capital is fixed by the fixing plate 12. Fixing is performed. In this manner, by extending the column bar 11 of the stigma to the same height as the parapet (column-shaped parapet 30), the fixing plate 22 is used without bending down the tail portion of the beam main bar (first step bar) 21. And fix it.

<Beam members>
The beam member 20 on the top floor has a fixing plate 22 attached to a tail portion (end) of a main bar 21. As described above, by extending the column reinforcement 11 of the stigma to the same height as the parapet (column parapet 30), the tail part of the beam main reinforcement (first step reinforcement) 21 is bent down in the beam member 20 on the top floor. Since the fixing can be performed using the fixing plate 22 without using the fixing plate 22, various restrictions on the fit between the main reinforcement 11 of the column member 10 and the main reinforcement 21 of the beam member 20 can be avoided. As described above, in the beam member 20 on the top floor, not only the fixing plate 22 can be attached to the tail portion (end portion) of the main bar (first step bar) 21, but it is not necessary to go around the top end of the column member 10. Parapets can be precast.

<Parapet>
The parapet is precast, and includes a column-shaped parapet 30 attached to the upper portion of the column member 10 and a beam upper parapet 40 attached to the upper portion of the beam member 20. The column-shaped part parapet 30 is provided with an inner concave portion 31 for accommodating the column bar 11 of the capital. Further, an attachment member 70 for attaching a temporary scaffold (multi-layer scaffold) can be attached to and detached from the beam upper parapet 40.

<Mounting members for temporary scaffolds>
The attachment member 70 is a member for attaching a temporary scaffold (multi-layer scaffold / not shown). Although not shown in detail, a base temporarily installed on an attachment portion (anchor) 42 provided on the beam upper parapet 40. A base 71 and an arm 72 extending from the base 71 toward the outside of the building. Using this attachment member 70, a temporary scaffold (multi-layer scaffold / not shown) can be attached to the outside of the building.

<Temporary support / fixing member>
The temporary support portion 41 is a member for bringing the parapet (the beam upper parapet 40) into a state of being temporarily supported by the fixing member 50 fixed on the roof, and the inner side surface of the beam upper parapet 40 and the upper surface of the beam member 20. It is provided in. The temporary support portion 41 is formed of an anchor provided on the inner side surface of the beam upper parapet 40 and the upper surface of the beam member 20, and the fixing member 50 is formed of a box-shaped member having an open side surface.

  Then, the lower surface of the fixing member 50 is fixed to the temporary support portion (anchor) 41 provided on the upper surface of the beam member 20 using a bolt (not shown), and the upper part of the beam is By fixing the side surface of the fixing member 50 to the temporary support portion (anchor) 41 provided on the inner side surface of the parapet 40, the beam upper parapet 40 is temporarily supported by the fixing member 50 fixed to the roof.

<Construction procedure of parapet structure>
In order to construct the parapet structure according to the embodiment of the present invention, the column-shaped parapet 30 and the beam upper parapet 40 are attached to the outer wall surface of the roof. At this time, the column stirrup 11 of the stigma is positioned in the inner concave portion 31 of the column portion parapet 30. Also, the beam upper parapet 40 is temporarily supported on the roof by using the fixing member 50.

  Then, a temporary scaffold (multi-layer scaffold / not shown) is attached to the outside of the building using the attachment member 70, and the formwork is set at a predetermined position. In addition, the adjacent beam upper parapets 40, the adjacent column-shaped portion parapet 30 and the beam upper parapet 40 are connected by hanging a connecting member (not shown) over the upper portions.

  Then, concrete is cast so as to cover the inner concave portion 31 of the column-shaped portion parapet 30 and the column bar 11 of the column capital. In addition, grout is injected from the grout injection ports 32 and 43 provided in the column parapet 30 and the beam upper parapet 40 to fill the gap between the outer wall surface of the roof and the column parapet 30 and the beam parapet 40. I do. Then, a finishing operation such as attaching the coping 60 to the upper part of the columnar part parapet 30 and the beam upper parapet 40 is performed, and the attaching member 70 and the fixing member 50 are removed.

DESCRIPTION OF SYMBOLS 10 Column member 11 Column reinforcement 12 Fixing plate 20 Beam member 21 Main reinforcement 22 Fixing plate 30 Column parapet 31 Inner recess 32 Grout material inlet 40 Beam upper parapet 41 Temporary support (anchor)
42 mounting part (anchor)
43 Grout material inlet 50 Fixing member 60 Kasagi 70 Mounting member 71 Base 72 Arm

Claims (4)

A parapet structure of a building,
A column member on the top floor where the column stirrup of the stigma is extended to the same height as the parapet, and a fixing plate is attached to the tail of the stirrup,
A beam member on the top floor with a fixing plate attached to the tail of the main bar,
A precast concrete parapet attached to the top of the column member and the beam member,
A parapet structure using a precast concrete member, comprising:   The parapet structure using a precast concrete member according to claim 1, wherein the parapet has a mounting member for a temporary scaffold mounted outside a building.   The parapet structure of a building according to claim 1 or 2, wherein the parapet includes a column-shaped parapet mounted on an upper portion of the column member and a beam upper parapet mounted on an upper portion of the beam member.   The parapet using a precast concrete member according to any one of claims 1 to 3, further comprising a temporary support portion for temporarily supporting the parapet with respect to a fixing member fixed on a rooftop. Construction.

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