JP2711572B2 - Formwork construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is particularly applicable to RC (reinforced concrete) or SRC
The present invention relates to a method for building a formwork for placing a concrete body having a corner portion such as a pillar, particularly of a (steel-reinforced concrete) body.

[Prior Art] Conventionally, as shown in FIG. 5, a form 17 of a plywood panel or the like is built around a column reinforcement 15 and a hoop 16 as shown in FIG. In addition to attaching the horizontal thick member 18 and the vertical thick member 17 made of a round pipe or the like to the outside of the mold 17, the separator 20 is disposed between the opposing molds 17, 17. Cone 21, connected to both ends of
The formwork 17 was assembled by tightening the formwork tightening rod 22, the round pipe washer 23, the tightening nut 24 and the like. Further, a thick material 25 such as a square material is attached to a corner portion where the above-mentioned horizontal thick material 18 intersects, and the corner is fastened by a chain 26 or the like to be firmly assembled.

However, in the conventional method as described above, the thick end member 25 for corner tightening is specially required, and not only it is necessary to tighten the chain 26 or the like, but also the work of mounting the separator 20 is required, and the installation is complicated. There was a problem that it took time and effort.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to eliminate the need for a corner thickening material and a separator. It is an object of the present invention to provide a method for constructing a formwork in which the corners of the formwork can be securely and quickly assembled without the necessity of performing such operations.

[Means for Solving the Problems] According to a formwork erection method of the present invention, a support rod is arranged inside a corner of both formworks joined at a predetermined angle, and bolts arranged at both ends of the support rod are provided. It is assumed that a cone is externally fixed to a cap nut with a bolt which is screwed, and both the molds are respectively clamped between a mold tightening rod screwed to a bolt portion of the cap nut with the bolt. It is a feature.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a support rod, which is formed by bending both ends of a steel strip to form a cone mounting portion 1a.

As is clear from FIG. 2, a bolt hole is formed in the cone mounting portion 1a, and a bolt 2 is inserted from the inside and fixed by welding or the like. A bolted cap nut 3 is screwed to the bolt 2 from outside. A cone 4 made of plastic or the like is extrapolated and fixed to the cap nut 3 with bolts.

In the present embodiment, the center lines of the two bolts 2, 2 are made orthogonal to each other so that the corners of the formwork are joined in an orthogonal state, but the present invention is not limited to this.
The bolts 2, 2 may be attached so that the center lines intersect at an appropriate angle in accordance with the angle of the corner of the concrete body to be cast.

Note that the support rod 1 is not limited to the one in the above embodiment, and may be formed by bending a rod material such as a reinforcing bar.
When the supporting rod 1 is made of a rod material, the bolts 2, 2 can be formed integrally by bending both ends thereof.
Further, the bending mode of the support rod 1 is not limited to the above-described embodiment. In short, the bolts 2, 2 at both ends of the support rod 1 are oriented at the predetermined angle while avoiding the column bars at the corners. Anything should do. In order to provide the support rod 1 with considerable rigidity, reinforcing means such as reinforcing ribs may be provided.

Next, a method of building a form using the jig will be described.

First, as shown in FIG. 3, after arranging the column bar 5 and the hoop 6, etc., the mold 7 on one side is erected. The jig is attached to the inside of the end of the formwork 7 in advance. That is, the bolt portion 3a of one of the cap nuts 3 with bolts is inserted into a hole formed in the end of the mold frame 7, and the mold frame 7 is tightened and fixed by the mold clamping rod 8 from the outside. A round pipe rib washer 11 is attached to the form-tightening rod 8, and a horizontal end thick member 9 and a vertical end thick member 9 are attached.
Tighten and clamp 10.

Subsequently, the bolt 3a of the other cap nut 3 with a bolt is inserted through a hole formed in the end of another mold 12, and as shown in FIG. Attach perpendicular to.

When the construction of the formwork around the pillar is completed, concrete is poured in, and after hardening, the mold is removed in the same manner as before.

It is preferable that a projection 1b is provided at an intermediate portion of the support rod 1 so as to prevent the concrete at the corner C (see FIG. 4) from peeling.

[Effects of the Invention] Since the corners of the two formwork are firmly connected, a thick material for corner tightening becomes unnecessary, and not only the square tightening work becomes unnecessary, but also the separator becomes unnecessary, and the formwork becomes unnecessary. Can be performed quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a jig used in the method of the present invention, FIG. 2 is a plan view showing a part of the jig, and FIG. , FIG. 4 is a cross-sectional view showing a completed state of mounting of the corner form, and FIG. 5 is a cross-sectional view of a conventional corner form being built. 1 ... support rod, 1a ... both ends, 1b ... peeling prevention piece, 2 ...
... Bolts, 3 ... Cap nuts with bolts, 3a ... Bolts,
4 ... cone, 5 ... pillar, 6 ... hoop, 7 ... formwork, 8 ... formwork fastening rod, 9 ... wide end thick material, 10 ... vertical end thick material, 11 ... Rib washer for round pipes, 12 ... Formwork.

Claims (1)

(57) [Claims] 1. A supporting rod is arranged inside a corner of both mold frames joined at a predetermined angle, and a cone is externally inserted into a cap nut with a bolt screwed to a bolt disposed at both ends of the supporting rod. Fix it,
A method for constructing a formwork, characterized in that the formwork is clamped between formwork tightening rods screwed onto bolt portions of the bolt nuts.