JP3067605B2 - Thin beam PC formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-walled PC form formed by raising both sides of a flat plate-shaped PC plate along folds.

[0002]

2. Description of the Related Art In a method of constructing a structure using a thin PC form, a thin PC form formed in a member shape such as a column, a beam, a floor slab, or the like is assembled into a structure shape in advance, and then a reinforcing bar is arranged. A structure is formed along the appearance of the assembled shape of the thin PC form by integrating the thin PC form with the thin PC form by creasing and casting concrete. Therefore, this construction method eliminates the need for installation and removal of formwork and shoring,
There is an advantage that the number of construction steps can be reduced and the construction period can be shortened.

[0003] Among them, the thin-walled beam PC form has a bottom plate portion and a flat plate-shaped precast concrete slab having a pair of folds, which are raised from the folds, because of the thinness of the members. The bottom plate is formed integrally with both side plates rising in a U-shape on both sides of the bottom plate.
Space saving at the time of stocking is aimed at.

FIG. 3 shows a thin-walled beam PC form having such a structure. This has a v-shaped fold 2 along the longitudinal direction on both sides of the bottom plate 1 and side plates 3 on the left and right sides of the bottom plate 1. The folds 2 are integrally formed at the construction site as shown by arrows.
Are raised to the left and right side plate portions 3 with the hinge as a hinge base point, thereby forming a thin beam PC frame having a U-shaped cross section.

In this case, a plurality of separators 4 are arranged at predetermined intervals between both side plate portions 3 in order to raise and hold both side plate portions 3 in a U-shape.

The separators 4 are provided to hold the both side plate portions 3 in a rising state and to oppose the lateral pressure of the concrete poured into the inside thereof. It comprises a pair of rod-shaped main bodies 4a fixed via resin concrete or the like, and a turnbuckle 4b for adjustment, which is located at the center and connects the other ends of the main bodies 4a.

[0007]

The height of the beam PC form is 800 mm, the width is 600 mm, the thickness of the member is 25 mm, and the arrangement height of the separator 4 is 45 mm from the inner bottom surface of the bottom plate 1. Height position. This is the upper limit of this height position in order to avoid obstacles to the work of arranging the reinforcing steel to be internally arranged later.

Therefore, when adjusting the turnbuckle 4b, a worker must lean out and engage a fastening tool on the outer periphery of the turnbuckle 4b to rotate it.
Since the tool immediately hits the bottom for each rotation due to the low height position from the bottom plate, the amount of adjustment for each operation is small. Since it is necessary to find a suitable angle and rotate it while engaging it, there is a problem that the work efficiency is poor and the workability is poor because the worker is forced to take an unreasonable posture.

The present invention has been made to solve the above-mentioned problems, and provides a thin-walled beam PC frame capable of easily and efficiently adjusting a separator in a thin-walled beam PC frame having such a structure. It is intended to be.

[0010]

According to a first aspect of the present invention, a flat precast concrete slab having a pair of folds is set up from the folds. Thus, a bottom plate portion and both side plate portions rising in a U shape on both sides of the bottom plate portion are integrally formed, and a thin-walled beam PC held in a rising state with a separator interposed between the both side plate portions is formed. In the formwork, the length of the main body of the separator is formed to be shorter than the normal width in the beam, and one end thereof is fixed to the one side plate portion, and a sleeve nut is attached to the other end, and from the outside of the other side plate portion. By screwing and fixing the bolt that penetrates the sleeve nut to the sleeve nut, adjustment and fixing can be performed by rotating the bolt from the outside.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a thin beam PC formwork according to the present invention. In the drawings, the same parts as those in the related art are denoted by the same reference numerals, and only different points will be described using different reference numerals.

In the thin beam PC form shown in the drawing, side plates 3 are integrally formed on both sides of a bottom plate 1 through v-shaped folds 2 along its longitudinal direction, almost in the same manner as in the prior art. At the construction site, the left and right side plates 3 are raised with the fold 2 as the hinge base point, thereby forming a thin-walled PC form having a U-shaped cross section.

Further, in order to raise and hold both side plate portions 3 in a U-shape, a plurality of separators 10 according to the present invention are arranged at predetermined intervals between both side plate portions 3.

The separator 10 is formed to have a length shorter than the inside width of the beam, and one end thereof is fixed to the one side plate portion 3 via resin concrete or the like. A sleeve nut 14 having one end screwed and fixed to the end side and the other end side in contact with the inside of the other side plate portion 3, and a bolt formed from the outside of the other side plate portion 3 through the inside and outside thereof A bolt 16 is screwed into the sleeve nut 14 through the through hole 3a.

Therefore, when the side plate 3 is adjusted and fixed at the time of start-up, first, the sleeve nut 14 is screwed and adjusted so that the side plate 3 is vertically raised and hits the inner wall surface of the other side plate 3 at a time. After that, the sleeve nut 14 is pressed down and fixed with a spanner or the like in a state where the sleeve nut 14 is aligned with the bolt through hole 3a, and then the bolt 16 is screwed into the sleeve nut 14 from the outside to fasten the two. The plate part 3 is fixed in a standing state.

At this time, the sleeve nut 14 remains fixed, and only the bolt 16 needs to be turned from the outside.
The adjustment and fixing work can be performed without being restricted by the rotation angle. In addition, since the worker does not need to lean on the body to fix the sleeve nut 14, the worker can work in a reasonable posture.

[0017]

As described in detail in the above embodiment, in the thin-walled beam PC formwork according to the present invention, the start-up adjustment and fixing work of both side plates are performed by turning the bolt from the outside. Since it can be performed, the work is easier than the conventional adjustment work using a turnbuckle, the amount of adjustment for each operation can be increased, the work efficiency can be greatly improved, and adjustment is performed with a reasonable posture There are various advantages such as being able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembled state of a thin beam PC formwork according to the present invention.

FIG. 2 is a cross-sectional view showing the completed assembly state.

FIG. 3 is a perspective view showing an assembled state of a conventional thin beam PC formwork.

[Description of Signs] 1 Bottom plate 2 Fold 3 Side plate 10 Separator 12 Main body 14 Sleeve nut 16 Bolt

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuyuki Yasuhara 35, Nishimachi, Chuo-ku, Kobe, Hyogo Prefecture Inside Obayashi-gumi Kobe Branch Co., Ltd. (72) Inventor Shigekazu Sakurai 35, Nishimachi, Chuo-ku, Kobe, Hyogo Obayashi, Inc. Within the Kumi Kobe Branch (72) Inventor Go Watanabe 35, Nishimachi, Chuo-ku, Kobe City, Hyogo Prefecture Inside the Obayashi Gumi Kobe Branch Co., Ltd. (72) Inventor Kei Sakamoto 35, Nishimachi, Chuo-ku, Kobe City, Hyogo Prefecture Inside the Obayashi Gumi Kobe Branch (72) Inventor Tetsuro Ito 35 Nishimachi, Chuo-ku, Kobe City, Hyogo Prefecture Inside Obayashigumi Kobe Branch Co., Ltd. (72) Inventor Hiroshi Yamashita 35 Nishimachi, Chuo-ku Kobe City, Hyogo Prefecture Inside Obayashigumi Kobe Branch Co., Ltd. (56) Reference Literature Utility model registration 2545296 (JP, Y2) Patent 2768153 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04C 3/20 E04B 1/16

Claims (1)

(57) [Claims] 1. A flat precast concrete slab having a pair of folds is erected on the basis of the folds to form a bottom plate portion and both side plate portions rising in a U-shape on both sides of the bottom plate portion. In a thin-walled PC formwork which is integrally formed and held in an upright state with a separator interposed between the both side plate portions, a main body length of the separator is formed to be shorter than a normal width in the beam, and one end thereof And fixed to the one side plate portion,
A thin-walled beam PC frame, wherein a sleeve nut is attached to the other end, and a bolt penetrating therethrough is screwed into the sleeve nut from outside the other side plate portion.