JP2782111B2 - Steel framing construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a steel frame precedent construction method.

"Problems to be solved by the prior art and the invention" A structure for constructing an SRC (steel-framed reinforced concrete) or S (steel) image superstructure on a RC (steel reinforced concrete) substructure, wherein the structure is nuclear When the substructure of a special structure such as a building is overcrowded, for example, when the main bars in the x and y directions intersect at the intersection of the foundation beam or girder, it is difficult to set anchor bolts to the substructure. Therefore, a method of raising the lower end of the base plate as shown in FIG. 8 is usually employed.

In other words, as shown in FIG.
After the concrete b is launched on the lower structure a to a height corresponding to the length of the anchor bolt, the anchor bolt c is set on the concrete, and the base mortar d is further constructed on the concrete. A steel frame e is constructed on the mortar, and is fastened and fixed to the base plate f at the lower end with the anchor bolts c.

Therefore, in this method, the column is half-finished, and extra steps such as rebar assembly, formwork assembly, concrete placement, curing, formwork dismantling, and base mortar work are required to launch the concrete b. Work period, trouble,
There is a disadvantage that excessive materials are required and the cost is high.

In another method, an embedded metal such as an iron plate is fixed on the upper surface of the densely reinforced RC lower structure, a steel frame is constructed on the embedded metal, and the lower end is welded on the embedded metal. Some steel studs are expected to transmit shear force by implanting a large number of stud dowels and constructing the required superstructure of SRC structure. This will increase costs.

The present invention is to solve such a conventional problem.

[Means for Solving the Problems] In order to achieve the above object, the invention of claim 1 is to fix an embedded metal on the upper surface of the RC lower structure of the densely arranging bars, and to fix an anchor frame on the embedded metal. Is installed, a splice form is provided around the anchor frame, concrete is cast inside the anchor form, and then a steel frame is erected on the anchor frame.

Further, the invention according to claim 2 is characterized in that an embedded metal is fixed on the upper surface of the RC lower structure of the overcrowded reinforcement, an anchor frame is installed on the embedded metal, and then a steel frame is mounted on the anchor frame. It is characterized by the fact that the concrete is poured into the anchor frame at once by placing the concrete into the pillar.

"Action" Because of the above configuration, it is not necessary to launch concrete on the RC substructure in advance in the case of steel frame construction, and it is not necessary to plant a large number of stud dowels in the steel frame. It is possible and the intended purpose can be achieved.

"Example" First, the procedure of the construction will be specifically described with reference to FIGS. 1 to 4 and FIG.

I. In constructing the RC substructure 1 such as the foundation beams and girder beams, which are to be overcrowded, embedding hardware 2 such as an iron plate with stud dowels is fixed to the upper surface of the RC substructure 1 by exposing the surface and curing. I do.

II. An anchor frame 3 is fixed on the embedded metal parts 2 by fillet welding, and the level of the template receiver 4 at the upper end of the anchor frame is adjusted by adjusting bolts 5.
The template receiver 4 is fixed to the anchor frame pillars 6 by welding, and the adjustment bolts 5 are removed.

III. On the template receiver 4, the template 7 is fixed at a regular position with temporary bolts 8.
Are fixed to the template receiver 4 by welding, and the temporary bolts 8 are removed.

Further, around the outer circumference of the anchor frame 3, a joint form 9 made of expanded metal or the like is fixedly provided, and inside the joint form, that is, the infill concrete 10 is cast inside the anchor frame 3, Cure.

IV. After the column steel frame 11 is constructed on the template 7 and the position thereof is adjusted, the nuts 13 are screwed into the anchor bolts 12 projecting from the anchor frame 3 to tighten the base plate 14 at the lower end of the column steel frame 11. Fasten and fix.

Thereafter, reinforcing bars 15 (FIG. 2) are appropriately provided around the anchor frame 3 to the column steel frame 11, the column formwork is assembled, the column concrete 16 (FIG. 2) is cast, and after curing, the column type is formed. The frame is removed and the SRC pillar shown in Fig. 2 is constructed.

By the way, the joint formwork 9 and the infill concrete 10 in the above III. Have the strength that the anchor frame 3 can sufficiently support the column steel frame 11, and when the column concrete 16 is cast, the column concrete is transferred to the anchor frame 3. It is unnecessary if it can be driven into the interior sufficiently.

As the anchor frame 3, one shown in FIGS. 3 to 5 or one shown in FIG. 7 may be used. 3 to 5, the lower ends of the anchor bolts 12 are fixed to the lower part of the anchor frame 3, and in FIGS.
The lower ends of the anchor bolts 12 are fixed to the intermediate portion of the anchor frame 3.

In each of the anchor frames 3 shown in FIGS. 3 to 5 and 7, the template receiver 4 has four frame post members 6.
Are formed on the outside of the frame, and a flat rectangular frame 17 which is fitted vertically is formed, and small plates 18 are welded and fixed to the four corners of the frame so as to face the top end of the frame pillar 6. Adjustment bolt 5 that abuts against the top of the frame post
Are screwed through from above, and the template 7 (FIG. 6) is fixed to the center of the frame with temporary bolts 8.
9 have been installed.

Reference numerals 20,..., 21 are long holes for the temporary bolts 8 formed in the support plates 19, 19 and the template 7.

Further, the lower ends of the anchor bolts 12 are fixed to the bars 22, 22 erected at appropriate places of the anchor frame 3.

In the drawings, 23 ... are mounting bolts provided at the lower end of each column member 6 ... and 24 ... are anchor bolt through holes formed in the template 7.

According to the present invention, according to the present invention, it is not necessary to launch concrete in advance on the RC substructure in the case of steel frame construction, and therefore, the column is not half-built, and Required rebar assembly, formwork assembly,
Certain processes such as concrete casting, curing, formwork dismantling, base mortar construction, etc. can be omitted, the construction period, labor and materials can be reduced, and there is no need to plant a large number of stud dowels on the steel frame, reducing costs. Can be planned.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 7 show an embodiment of the present invention, FIG. 1 is a process explanatory view, FIG. 2 is a cross-sectional side view showing an SRC pillar after construction, FIG. 3 is a plan view showing an example of an anchor frame to be used, FIG. 4 is a cutaway side view, FIG. 5 is a sectional view taken along the line VV of FIG. 4, and FIG. FIG. 7 is a side view showing another example of the anchor frame, and FIG. 8 is a sectional side view showing a conventional example. 1 RC substructure 2 Embedded metal 3 Anchor frame 4 Template holder 5 Adjust bolt 6 Frame pillar 7 Template 8 Temporary bolt 9 Joint formwork, 10… Concrete concrete 11 …… Column steel frame, 12 …… Anchor bolt 13 …… Nut, 14 …… Base plate 15 …… Reinforcement, 16 …… Column concrete 17 …… Frame body, 18… ... Small plate 19 ... Support plate, 20,21 ... Long hole 22 ... Bar, 23 ... Mounting bolt 24 ... Through hole for anchor bolt

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Taniguchi 1-18-22 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Takenaka Corporation Nagoya Branch (56) References JP-A-3-69722 (JP, A (58) Fields surveyed (Int. Cl. ⁶ , DB name) E04B 1/24 E04B 1/16 E04B 1/30

Claims (2)

(57) [Claims] 1. An embedded metal fixture is fixed on the upper surface of an RC lower structure of overcrowded arrangement, an anchor frame is installed on the embedded metal body, and a splicing form is provided around the anchor frame. A steel-frame-based construction method in which concrete is cast inside, and then a steel frame is built on the anchor frame. 2. An embedded metal fitting is fixed to the upper surface of the RC substructure of the overcrowded arrangement, an anchor frame is mounted on the embedded metal, and a steel frame is erected on the anchor frame. A steel-frame-preceding construction method, in which concrete is poured into the interior of the building at a time by placing concrete later.