JP3194786B2 - Precast concrete formwork construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding method in which a precast concrete form is used as a driving form for a wall in the construction of a reinforcing steel bar or a steel concrete frame.

[0002]

2. Description of the Related Art Conventionally, in building a precast concrete formwork 10 as shown in FIG. 3 in a reinforced or steel concrete frame work, the precast concrete formwork 10 is placed at a predetermined place using a hoist. It is built while adjusting the fall with the diagonal support 30.

[0003]

In the above-mentioned conventional method,
If the precast concrete form 10 is very heavy, the diagonal support 30 must also be made robust. As described above, if the oblique support 30 is made robust, the weight increases, and the precast concrete form 10 to be lifted by the hoist also becomes heavy. Become.

[0004] The present invention has been made in view of the above-mentioned problems, and has been made to reduce the weight of a precast concrete formwork.
A technical task is to provide a precast concrete formwork construction method that can be easily carried in and out and that can be easily installed.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a spacer 5 is attached to the inner surface of one of the built-in formwork 1 in the frame construction of a reinforcing steel bar or a steel frame concrete. A hook mounting jig 13 is attached to the upper part of the other precast concrete form 10 to be built as a wall driving form, and the base 17 of the mounting hook 16 is inserted into the hook mounting jig 13 to thereby form the mounting hook 1.
The hook portion 18 formed at the tip of the fixing structure 25 is fixed to the fixing structure 25.
And the fastening tool 21 engaged with the base 17 is fastened, and the upper part of the precast concrete form 10 is pressed against the tip of the spacer 5 and fixed by the tensile force of the built-in hook 16. The method of embedding the formwork was adopted.

[0006]

According to the present invention, after the lower end of the precast concrete form 10 lifted by the hoist is installed in the same manner as the conventional method, the upper part of the precast concrete form 10 is lifted by the hoist and the inner surface of one form 1 is formed. Spacer 5 attached to
Abut on the tip of

Next, the hook portion 18 of the built-in hook 16
Is hooked on a fixed structure 25 formed as a steel frame of a beam, and the base 17 of the built-in hook 16 is mounted on the upper part of the precast concrete form 10.
Then, the fastener 21 is engaged with the base 17 and tightened, and the upper part of the precast concrete formwork 10 is pressed against the tip of the spacer 5 to be fixed.

In the present invention, as described above, since the heavy slanting support 30 is not attached to the precast concrete form 10, the overall weight is light and the loading and unloading by the lifting machine is easy. And the built-in hook 16
Can be formed with a small diameter and light weight, and can be mounted without the need for a hoist or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are views for explaining one embodiment of the present invention. In this embodiment, the wall thickness of one of the built-in formwork 1 is set in the frame construction of a reinforcing steel bar or a steel frame concrete. The securing spacer 5 is attached, and the screw bar 6 of the spacer 5 is expanded and contracted to adjust the spacer 5 to a predetermined length.

As a matter of course, the spacer 5 may be attached to one of the molds 1 before the other of the molds 1 is built. This embodiment includes an embodiment in which the spacer 5 is attached to one of the molds 1 before the building 1 is built.

Next, the other precast concrete form 10 to be built as a driving form of the wall is lifted by a hoisting machine, facing the one form form 1, and the lower end of the precast concrete form 10 is fixed by a predetermined method. And place it in a precast concrete form 10
Is brought into contact with the tip of the spacer 5.

A hook mounting jig 13 made of L-shaped steel is provided on the upper part of the other precast concrete formwork 10.
However, it is attached with bolts not shown. Then, the base 17 of several steel erection hooks 16 is inserted into several insertion holes provided along the longitudinal direction of the hook mounting jig 13, and formed at the tip end of the erection hook 16. The hooked hook portion 18 is hooked on a fixed structure 25 which is a steel frame of a beam installed above a wall to be formed.

Next, a fastener 21 formed as a nut is screwed into a male screw formed on the base 17 of the built-in hook 16, and the fastener 21 is tightened. This is a precast concrete formwork embedding method in which the upper part of the formwork 10 is pressed against the tip of the spacer 5 and fixed.

[0014]

According to the present invention, in order to fix the upper part of the other precast concrete formwork 10 to be built facing one formwork 1, the hook portion 18 at the tip of the built-in hook 16 is fixed. Hook 25, and hook 16
The base 17 is inserted into the hook mounting jig 13 mounted on the upper part of the precast concrete formwork 10 and tightened.
The upper part of the precast concrete form 10 is brought into contact with the tip of the spacer 5 attached to the inner surface of one of the forms 1, and the precast concrete form 10 is fixed by the pulling force of the built-in hook 16. is there.

As described above, in the present invention, the precast concrete formwork 10 is fixed by the built-in hook 16 which is fixed by a tensile force, so that the built-in hook 16 can be formed lightly, and the precast concrete form to which the built-in hook 16 is attached is provided. The weight of the formwork 10 can be reduced, and the loading and unloading of the precast concrete formwork 10 by the lifting machine can be easily performed.

Further, as described above, since the built-in hook 16 can be formed lightly, the precast concrete form 1
Remove from 0, precast concrete formwork 1 with a lifting machine
0 and lift the precast concrete formwork 1
Since 0 can be built, the precast concrete formwork 10 can be built more easily.

[Brief description of the drawings]

FIG. 1 is a side view for explaining one embodiment of the present invention.

FIG. 2 is a side view of a built-in hook used in one embodiment of the present invention.

FIG. 3 is a side view for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One formwork 5 Spacer 10 Precast concrete formwork 13 Hook mounting jig 16 Built-in hook 17 Base 18 Hook part 21 Fastening tool 25 Fixed structure

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-172658 (JP, U) JP-A-3-2145 (JP, U) JP-A 61-203947 (JP, U) Patent 85323 (JP, U.S.A.) C1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04B 2/86 E04G 17/06

Claims (1)

(57) [Claims] In a reinforced or steel concrete skeleton construction, a spacer 5 is provided on the inner surface of one of the built-in formwork 1.
And a hook mounting jig 13 is mounted on the upper part of the other precast concrete form 10 to be built as a driving form of the wall, facing the one form 1. Base 17 of hook 16
And hook the hook portion 18 formed at the tip end of the built-in hook 16 on the fixed structure 25, and
And the upper part of the precast concrete form 10 is pressed into contact with the tip of the spacer 5 and fixed by the tensile force of the erection hook 16.