JPH0617610B2 - Parapet construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction method for a parapet of a building having a rising concrete wall waterproofed by raising a waterproof layer on the top surface of a rooftop concrete slab inside, and in particular, The present invention relates to a method for constructing a parapet having a rising concrete wall integrated with a rooftop concrete slab.

Conventional technology When building parapets of a building as a reinforced concrete structure from the roof slab, the pillars on the top floor, concrete on the walls and beams on the roof, and concrete on the slab are usually cast at the same time. Is constructed in a separate process as splicing concrete, and the connection and integration are to extend the reinforcing bars of the outer wall at the time of construction of the roof slab, or to raise the connecting rebar from the beam or slab to splice the concrete. When the building is a steel structure and the roof slab is directly supported by the steel beams, the slab reinforcing bar is raised or a stiffening bar is used to construct a concrete wall body of parapets. The rooftop waterproof layer will be set up inside the building to carry out waterproofing work, and the waterproof layer will be installed inside. on the other hand,
In buildings mainly composed of steel frames, the outer wall is often formed by curtain walls, and accordingly, the parapet is also formed by a dry structure, but at this time as well, the foundation concrete wall is used to raise the waterproof layer. It is necessary, and in this case as well, the wall concrete is spliced on the concrete of the slab in a separate step.

Since the amount of concrete in such parapets is also relatively small, at the time of concrete pouring of the slab, the molds on both the inner and outer surfaces are assembled at the same time, and the slabs are separated by the thickness of the slab and supported. It is also possible to put the concrete of the wall part a little after placing the concrete of the slab and avoid the flow to the slab surface to form an integral concrete, but the inner and outer molds for the wall The frame needed special consideration for the supporting structure, and concrete formwork was required on both the inside and outside of the frame even when it was spliced in a separate process without simultaneous casting.

Problems to be Solved by the Invention In the construction of a rising wall body from a parapet part or a roof slab corresponding to it, formwork construction is carried out as work at a high place performed at the top of the building and at the outer periphery. Therefore, it is necessary to always consider safety.
In addition, the amount of concrete and the molding area of the formwork were inefficient, leading to problems in terms of cost, construction period, and safety. In addition, when the splicing is performed while avoiding complicated formwork support, this splicing surface becomes a weak point due to the integrity of the concrete, and it was unavoidable to form an unexpected water leakage path outside the covering surface of the waterproof work. In particular, when the outer wall is formed of a dry structure such as a curtain wall, a rising concrete wall body is required only for waterproofing work, and it is suitable for integration by splicing. There was no construction method, and it was desired to solve various problems of formwork for that purpose.

Means for Solving Problems The construction method of the parapet of the present invention is a rising concrete wall for waterproof construction installed on the outer peripheral portion of the rooftop concrete of a building, in which the curtain wall is attached to the frame of the steel frame structure. It was developed for the construction of a parapet that it has, and this wall body is formed in advance into a plate body by using precast concrete (hereinafter referred to as PC), and this PC plate is used as a support for parapets and is a steel frame. The gist is to support it on the girder beam and to integrate it into a standing wall when placing concrete slabs. The PC plate is provided with mounting brackets corresponding to the support brackets of the columns, and the engagement of these brackets is adjustable, and the PC plate supported vertically in the wall direction is a steel frame of the frame. From the above, the height of the lower surface is determined and supported, slabs and concrete are placed in this space, the lower edge of the PC board is embedded in the concrete upper surface portion, and it is possible to perform concrete placing that integrates these. It has a feature. The construction method of the present invention does not require any formwork work on the roof by adopting the PC board, so that not only it is excellent in safety, but also it is installed without requiring carpenter's skill to improve workability. And promote the progress of the construction period to the next process.

Example A construction method of a rising concrete wall for waterproof construction of the present invention will be described in detail with reference to the drawings of an example. FIG. 1 shows a rooftop of a building, FIG. 1 (1) is a sectional view, and FIG. 2 (2) is a front view of the inside of a parapet. (1) In the figure,
Reference numeral 1 is a steel column, 2 is a steel beam, 3 is a steel beam, and a deck plate 4 is laid at the top of the beam to form a roof with a concrete slab 5, and a waterproof layer 6 is provided on the upper surface. , There is a concrete block 7 on the top surface. 8 is a curtain wall for the exterior of the building, which extends upward and constitutes the exterior exterior of the parapet 9.

Reference numeral 10 denotes a rising concrete wall for the rising portion 61 of the waterproof layer 6, which is made of precast reinforced concrete, and is an H-shaped steel column 11 which is erected on the upper surface of a plate 31 in which the stigma diaphragm of the pillar 1 is extended outward. Supported by. The pillar 11 can be erected on the plate 13 by welding, bolting, or the like using a mountain-shaped steel piece, as in a conventional method. In the middle of the pillar 11, an H-shaped steel receiving beam is taken out from the steel beam girder 3, and other pillars 11 standing on the upper surface thereof are provided. These pillars 11 are assembled with connecting beams to serve as a support material for the parapet 9. There is. The PC board 10 of the rising wall is constructed by assembling the mounting metal fittings 12 provided on the upper and lower outer surfaces of both ends and the supporting metal fittings 13 provided on the inner surface of the pillar 11 corresponding to the vertical intervals of these metal fittings 12.
While it is vertically supported by No. 1, it is horizontally supported from the lower surface by level adjusting bolts 14 provided on the upper surface of the girder beam 3 at two positions near the ends. In addition, among the other members in the figure, 51 indicates a reinforcing bar of the concrete slab 5,
Reference numeral 52 is a large number of stud dowels planted on the upper surfaces of the steel beam 2 and the steel beam girder 3, and the slab / concrete 5 is fixedly supported on the steel frame.

Operation The operation of the construction method of the present invention will be described based on the construction process of the embodiment.

The rising concrete wall is prefabricated as a precast concrete plate 10, the length corresponds to the space between the columns 11, the height is usually 50 cm, and the thickness is 12 to 15 cm according to the design of the parapet 9. .

When this PC board 10 is manufactured on a surface plate, a mounting bracket 12 made of angle steel is provided on the upper surface which is an outer surface of the PC board 10. The mounting bracket 12 shown in a plan view in FIG. 2 (1) fixes the flange along the surface of the PC board 10 to the PC board 10 with an anchor bolt, and the horizontal flange is for the bolt in the protruding direction of the flange. A long hole is provided.

On the other hand, on the inner surface side of the pillar 11 of the building, a support bracket 13 made of angle steel is provided at a height position corresponding to the mounting bracket 12 of the PC board 10.
Install. The supporting metal fitting 13 has a vertical flange fixed to the support pillar 11, and a horizontal flange is made to protrude so as to face the flange of the mounting metal fitting 12, and the length thereof is a long hole in the longitudinal direction provided in the vicinity of the end portion on the support pillar 11. Two PCs supported by
The length is set so as to face the long hole of the mounting member 12 at the end of the plate 10.

As shown in Fig. 2 (2), the PC board 10 has a mounting bracket 12
And the horizontal flange of the support bracket 13 are overlapped with each other, the bolt is inserted into the long hole in the cross direction, the "standing" of the PC board 10 is confirmed, and then tightened, temporarily supported by the column 11, and then fixed by final tightening. To do.

The leveling bolt 14 is used to horizontally position the PC board 10 in the longitudinal direction. As shown in FIG. 3, the adjusting bolt 14 is composed of a pedestal 15 of a small piece of channel steel, both screw bolts 16 and an insert 17, and the insert 17 is attached to the PC board 10.
The base 15 is embedded in advance on the side surface which will be the lower surface of the, and the pedestal 15 is positioned and welded on the girder beam 3. The upper end of the bolt 16 is deeply screwed into the insert 17, the nut is fitted to the lower end of the bolt 16, the lower end of the bolt is fitted into the insertion hole on the upper surface of the pedestal 15, and the bolt 16 is rotated to lower the bottom of the PC board 10. Determine the height of the edge. The other adjusting bolt 14 is installed in the same manner, and the PC board 10 is lifted by the bolt 16 from below.
Is set to be horizontal in the length direction, and at this time, the assembling bolts of the mounting bracket 12 and the supporting bracket 13 are temporarily loosened and readjusted according to the position of the adjusting bolt 14 and the elevation of the PC board 10. P
The height of the lower side of the C plate 10 is preferably a position swallowed by 1 cm or more from the top of the concrete slab 5.

The method of building the PC board 10 is not limited to the above order. For example, the insert 1 of the PC board 10 temporarily set on the pedestal 15 with the bolt 16 standing short and temporarily supported by the column 11.
The height may be determined by screwing into the inside from the bottom, and then the mounting member 12 and the supporting member 13 may be fixed. Further, the on-site adjustment of the position of the pedestal 15 and the position of the insert 17 provided on the PC board 10 may be performed by forming the bolt insertion hole provided on the upper surface of the pedestal 15 as a long hole.

Next, arrange the required reinforcing bars 51 on the deck plate 4,
The roof slab is completed by pouring concrete, waterproofing work is applied on the upper surface, and the rising part 61 of the waterproof layer 6 is PC.
The plate 10 is extended from the inner and outer surfaces (the surface opposite to the surface supported by the columns 11) to the upper surface. The rising portion 61 of the waterproof layer is appropriately pressed to finish the inner surface of the parapet 9. The presser foot 7 of the asphalt / waterproof layer 6 is optional according to the roof specifications.

The concrete slab 5 is successively cast from the lower surface of the PC board 10 to the outside according to the support height of the adjusting bolt 14, and is integrated by swallowing the lower edge of the PC board 10.

Next, the inner and outer surfaces of the waterproof layer are covered with an exterior material, and the upper opening between the exterior material and the outer wall is closed with a head tree to complete the construction of the parapet.

In addition, as for the holding of the rising wall during construction, first of all,
Since it is supported by the pillars, all columns are supported even if external force is applied during installation work, wind pressure at a high place, or against the flow pressure of cast concrete or some scattering. Can be burdened with.

EFFECTS OF THE INVENTION In the construction method of the present invention, since the wall of the rising concrete is prefabricated by the PC, the formwork work at high places work is completely eliminated, and the construction work in a bad working environment is safe. , Which can be carried out efficiently and contributes to shortening the construction period. Further, since the two steps of roof slab and rising concrete wall are not required, waterproofing work can be started immediately after placing the concrete slab, and complicated formwork support, which is essential for simultaneous placement, is not required. INDUSTRIAL APPLICABILITY The construction method of the present invention is particularly suitable for performing consistent construction with a dry structure in the construction of a curtain wall exterior steel frame building parapet, and a reliable and accurate construction is achieved, and the adjusting means is special. It does not use equipment and does not require a high degree of skill.

[Brief description of drawings]

FIG. 1 shows a parapet portion of an embodiment to which the present invention is applied. (1) is a sectional view, (2) is a front view, and FIG.
FIG. 3 is a detailed view of the support structure with the C plate, and FIG. 3 is a detailed view of the support structure of the level adjusting bolt of the PC plate. 1 ... Steel columns, 2 ... Steel beams, 3 ... Steel girder beams, 5 ...
Concrete slab, 6 ... waterproof layer, 8 ... curtain wall, 9 ... parapet, 10 ... rising wall,
PC plate, 11 ... Support, 12 ... Mounting bracket, 13 ... Supporting bracket, 14 ... Level adjusting bolt, 61 ... Waterproof rising section.

Claims (1)

[Claims] 1. A method of constructing a parapet, wherein an outer wall is extended upward to form an exterior finish, a steel frame column is provided inside thereof, and a rising portion covered with a rising portion of a waterproof layer is provided. Inside the extended outer wall, a plurality of columns are erected at intervals on the upper surface of the plate that extends outward of the stigma of the column, and the rising concrete wall has the dimension of the columns as the interval between the columns and is waterproof. The length corresponding to the height of the rising part of the layer is made as a width in advance as a precast concrete plate, and mounting hardware is provided near both edge edges of this precast concrete plate. Standing in the width direction, the precast concrete plate is supported vertically on the support pillar by the mounting bracket and a support bracket provided at a height corresponding to the inside of the support pillar. Adjust the height from the lower side of the recast concrete plate with the level adjustment bolts installed on the girder on the roof, and then pour the concrete of the rooftop slab on the upper surface of the rooftop so as to swallow the lower edge of this precast concrete plate. Then, the lower edge of this precast concrete plate is buried to integrate the rising concrete wall and the concrete slab on the roof, and then the upper and inner and outer surfaces of this rising wall are covered with water to cover the concrete slab on the roof. The waterproof layer extended from the layer is covered with the rising part, and the inner and outer surfaces of the rising part of the waterproof layer are further covered with an exterior material, and the upper opening between the exterior material and the outer wall is closed with a Kasaki. A method for constructing a rising parapet characterized by doing.