JPH0242835Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a formwork fastener for forming concrete walls.

Conventional technology and its problems Conventionally, when assembling a concrete pouring form, a separate cone is installed on the inner surface of the formwork facing each other, and a separate pin is screwed into the head of a connecting bolt passed through the separate cone, and the connecting The screw shaft of the bolt is made to protrude outside the formwork, a fastening rod (called a home tie) having a screw tube at the other end is prepared, and the fastening rod is connected to the screw shaft of the connecting bolt using the screw tube. A method is adopted in which the end of the fastening rod is connected to the support by screwing it in and fastening it.

However, in the above-mentioned formwork fastening, it is necessary to rotate the fastening rod to the connecting bolt extending from the separate cone and fasten the fastening rod while progressing the threading. A considerable amount of rotational operation is required to apply tension and obtain tightening. Moreover, the fastening operation must be performed one by one for each of the countless separate cones arranged.
The current situation is that the screwing and unscrewing of the entire fastening rod is extremely inefficient and labor-intensive, and a lot of time is wasted in assembling and dismantling the formwork.

Purpose of the invention The present invention aims to connect the fastening pins on the separate cone side and the fastening pins on the column side, and to make sure that the pressing force of the fastening pins against the outside surface of the formwork and the tensile force of the connecting pins, which are necessary for tightening, are equal. This makes it possible to perform operations extremely easily and efficiently, and to significantly shorten the time required for assembling and dismantling formwork.

Structure of the invention In order to achieve the above-mentioned object, the present invention slidingly inserts the connecting pin on the separate cone side and the fastening pin on the column side, and connects the insertion portion with a long hole that is offset from each other in the axial direction. By pushing the wedge into both long holes, one side of the wedge presses one end of the long hole of the fastening pin, pressing the end face of the pin head against the outside surface of the formwork, and at the same time connects the other side of the wedge. The other end of the elongated hole of the pin is pressed in the opposite direction to apply a tensile force to achieve fastening.

Embodiments of the invention Examples of the invention will be described below in detail with reference to FIGS. 1 to 3.

FIG. 1 shows the formwork being fastened, and FIGS. 2 and 3 show the fastening parts.

1 is a formwork facing each other, and a large number of separate cones 2 are installed on the inner surface of the formwork 1. 1st
The figure shows a pair of separate cones facing each other, and a connecting pin 4 is inserted through a pin insertion hole 2a formed in the center of the separate cone 2. The connecting pin 4
In this example, one end of the separate cone 2 has a head portion as a screw tube 4a, and a flange portion 4b provided at the end of the screw tube is engaged with a stepped portion formed at the end of the pin insertion hole 2a to allow the cone to be pulled out to the outside of the formwork. As a stop, the connecting pin end 4c penetrates the formwork 1 and projects outward.

One end of the separate pin 3 is screwed into the head portion of the connecting pin 4, that is, the screw hole 4e of the screw tube 4a, and the other end of the separate pin 3 is screwed into the screw tube 4a of the connecting pin of the separate cone 2 facing the other end. The facing distance between the formwork 1 is maintained.

On the other hand, a fastening pin 5 for column connection having a connecting pin insertion cylinder 5a at one end is prepared, and the fastening pin 5 is slid into the connecting pin end 4c protruding outside the formwork using the connecting pin insertion cylinder 5a. Match. A connecting pin end portion 4c is provided at the insertion portion between the connecting pin 4 and the fastening pin 5.
Long holes 4d and 5d passing through the fastening pin insertion cylinder 5a are bored in communication with each other, and both long holes 4d and 5d are arranged with their positions shifted in the axial direction. That is, when the fastening pin 5 is inserted to the position where the head end face abuts against the outer surface of the formwork, both ends of the long hole 4d of the fastening pin end 4c and both ends of the long hole 5d of the fastening pin insertion cylinder 5a are aligned in the axial direction. The hole wall of the formwork side end of the elongated hole 5d is aligned with the elongated hole 4.
The end hole wall of the elongated hole 4d on the side opposite to the formwork protrudes toward the end of the elongated hole 5d.

Furthermore, wedges 6 are inserted into and removed from the long holes 5d and 4d.
form. The wedge 6 is formed of a metal plate,
The plate thickness surfaces are defined as pressing sides 6a and 6b.

As shown in FIG. 1, the wedge 6 is pushed into the elongated holes 5d and 4d placed in communication with each other. Long hole 5
d and 4d are arranged at different positions as described above,
As the wedge advances, the one offset end of the elongated hole 5d of the connecting pin insertion cylinder 5a is pressed by the one pressing side 6a, and the connecting pin end 4 is pressed by the other pressing side 6b.
The other shifted ends of the elongated holes 4d of c are pressed in opposite directions. By this pressing, the connecting pin 4 and the fastening pin 5 are moved in the direction of deeper insertion into each other. The end surface of the flange portion 5b formed at the head side end of the fastening pin 5 is strongly pressed against the outer surface of the formwork 1 by the pressing movement of both pins as the wedge is pushed in, and at the same time,
The connecting pin 4 is pulled to the outside of the formwork to apply tensile force.

Fastening is achieved by the synergistic effect of the pressing force and the tensile force generated as a reaction, and at the same time, the wedge 6 is firmly captured. In this fastened state, the end 5c of the fastening pin 5 is connected to a support (not shown).

Effects of the invention As explained above, the present invention allows the connecting pin on the separate cone side and the connecting pin on the column side to be slidably inserted, and a long hole that is offset in the axial direction from each other is bored in communication with the insertion part. By simply pushing the wedge into both long holes, one side of the wedge can press the other end of the long hole of the fastening pin and forcefully press it against the outside of the formwork, and the other side of the wedge can press the other end of the long hole of the connecting pin. By pressing the end in the opposite direction, it is possible to apply a strong tensile force to the connecting pin as a reaction to the above-mentioned pressing force to achieve fastening, and it is possible to connect the connecting pin on the separate cone side and the fastening pin on the column side, and to form the form of the fastening pin. The pressing force on the outer surface and the tensile force of the connecting pin can be achieved with only one action of pushing the wedge, and the work of fastening both pins can be performed extremely easily and efficiently.

Similarly, the fastening can be immediately released by removing the wedge, which significantly shortens the total work time for attaching and detaching countless fastening pins, which in turn makes it possible to greatly shorten the formwork assembly and removal work, and furthermore, the labor involved. Significantly reduce the burden. In addition, it is of great help in improving the worksite by reducing construction costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention in a formwork fastened state, FIG. 2 is a side view of a fastening pin and a connecting pin as fastening parts, and FIG. 3 is a side view of a wedge. 1... Formwork, 2... Separate cone, 3...
Separate pin, 4... Connecting pin, 5... Fastening pin, 5a... Connecting pin insertion tube, 4c... Connecting pin end, 5c... Fastening pin end, 4d, 5d...
Long hole, 6...wedge, 6a, 6b...pressing side.

Claims (1)

[Scope of utility model registration request] A connecting pin is inserted through a separate cone installed on the inner surface of the formwork, the end of which penetrates the formwork and projects outward, and one end of the separate pin is screwed into the head of the connecting pin, and the same A formwork fastener that is screwed onto the connecting pin head of a separate cone installed on the inner surface of the formwork with its ends facing each other, and is connected to the support via the connecting pin that protrudes outside the formwork. A fastening pin that is slidably inserted into the end of the fastening pin and the connecting pin is provided with a long hole that communicates with each other and has an axial shift at both open ends. , a wedge is provided that can be inserted into and removed from both of the elongated holes, and when the wedge is pushed in, one offset end of the elongated hole of the fastening pin and the other offset end of the elongated hole of the connecting pin are pressed in opposite directions to each other. Both pins are moved in the direction of deepening the above-mentioned insertion, and this pressing movement presses the head side end surface of the fastening pin against the outer surface of the formwork, and at the same time applies a tensile force to the outside of the formwork to the connecting pin to achieve fastening. A formwork fastener characterized by: