JP2794030B2 - Press-fit jig - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting hole jig in a concrete casting method for press-fitting concrete from below into a structural frame, a steel pipe column, or the like.

"Conventional technology" In the method of casting concrete into the structural formwork and steel pipe columns, the concrete falls into the structural form from the slab height, so the free fall height of the concrete increases. Also, it is likely to collide with obstacles such as steel rebar in the middle of dropping, easily causing aggregate separation of concrete, especially when the floor height is high or when the rebar of the aggregate member is arranged congested Such an effect is likely to occur. In addition, the injected air at the time of falling concrete causes jumping and large air bubbles in the launched concrete. Furthermore, the tremy tube, in which the supply pipe is extended to the casting site in order to avoid the above-mentioned adverse effects, cannot be used depending on the arrangement of the steel frames and reinforcing bars in the structural body. All of the above problems stem from trying to pour concrete from above.

Therefore, a construction method in which concrete is injected from below rather than from above is disclosed in JP-A-56-93374.
And Japanese Patent Application Laid-Open No. 64-62555.

In this way, the concrete can be poured continuously from the lower part without being trapped in the air, and the concrete in the press-fitting area can be driven while being pressed by the concrete pressing device and the weight of the concrete. Since the air to be contained in the concrete is also pushed out to the upper part, there is no hollow part in the middle of the concrete, the concrete is strong, durable, durable concrete is poured, and the concrete is poured. As it rises in an average mixed state without aggregate separation, it is possible to form a concrete wall with average strength without steel frames and rebars becoming an obstacle, and there is no variation in concrete inside due to a difference in specific gravity it can.

A jig for a press-fitting hole in a concrete placing method for press-fitting from the lower part described above is introduced in the above-mentioned JP-A-64-62555. That is, in FIGS. 2, 3 and 4, the press-in hole jig 13 has a through hole 1 for introducing concrete, and has a rectangular shape in which the connection flange 2 for the surrounding weir plate is disposed on the outer peripheral edge. A pair of horizontal frames 4 having an L-shaped cross section is fixed to both sides of the through hole 1 on the main plate 3.
The connecting pieces 5 and 6 are connected at right angles to the horizontal frames 4 between both end portions opposed to each other with the horizontal frame 4 interposed therebetween.
A shutter 9 fitted slidably between the holes and having a through hole 7 at a position corresponding to the through hole 1 and having an L-shaped handle 8 at one end is stretched. The through hole 1 is opened and closed by sliding the frame 4 as a guide.

In the drawing, reference numeral 10 denotes a bolt for tightening the shutter 9 screwed into the connecting piece 5.

A hose connection tube piece 12 is screwed to the horizontal frame 4 via a mounting seat 11 thereof. In the figure, A is the structural body frame, H
Indicates a hose.

"Problem to be Solved by the Invention" In a conventional press-fitting jig, a mold A
The back-up of the shutter 9 which resists a large pressure from the inside is provided with a predetermined strength by the hose connection tube piece 12 being bridged between the horizontal frames 4 and 4 and integrally attached to the horizontal frame 4. ,
4 It is impossible to withstand only the locking effect of the locking portions 14 provided slightly at the tip.

However, in the press-fitting jigs 13 provided in the formwork, the connection tube piece 12 cannot be diverted when the concrete casting is completed, and is restricted until the concrete is solidified.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press-fitting jig in which a connecting tube piece can be diverted immediately upon completion of concrete placement.

Means for Solving the Problems In order to achieve the above object, in the press-fitting jig of the present invention, a rectangular main plate screwed to a mold surface having a through hole for concrete injection, A backup plate which has a through hole at a position corresponding to the charging through hole, and which is provided with a pair of weirs at both ends sandwiching the through hole and which is screwed and pressed to the rectangular main plate, It has a through hole corresponding to both through holes, a shutter provided with an L-shaped handle at one end that is guided and slid by the pair of weirs, and is screwed to the backup plate via a mounting seat. And a connecting cylinder piece.

It is preferable that the tube portion of the connection tube piece is assembled so as to swing freely with respect to the mounting seat.

[Operation] In the press-fitting hole jig configured as described above, the cast-in concrete pressure received by the shutter is supported by the backup plate that is entirely covered. For this reason,
There is no problem if the connecting tube piece is removed at the stage where the concrete is not solidified.

Example An example will be described with reference to the drawings.
In (c), an assembling guide for a backup plate 17 described below is provided on both sides of a rectangular main plate 16 having a concrete introduction through hole 15 stuck to a mold surface with screws to form a mounting plate. It is good to shape the bent ribs 18 and 18 to serve also as a function. A pair of weirs 19, 1 are provided at both ends of the crimping surface of the backup plate 17 which is screwed and crimped to the main plate 16.
9 is provided, and a through hole 20 corresponding to the through hole 15 is provided in the middle of the weir portions 19, 19.

A shutter 23 having a through-hole 22 corresponding to the through-holes 15 and 20 is inserted in the lower half of the gap 21 formed by the raising dams 19 and 19.

An L-shaped handle 24 is provided at one end of the shutter 23, and is used for impact dropping and falling prevention.

The connecting cylinder piece 26 having the mounting seat 25 is the mounting seat 25
Is screwed to the backup plate 17 via

As described above, since the three stacking members 16, 17, 25 are fastened via screws, it is possible to use a common screw. However, as shown in FIG. Care must be taken not to attach to the screw for crimping the main plate 16 and the backup plate 17. This is because the connecting tube piece 26 cannot be diverted, and the connecting tube piece 26 must be attached to a separate screw that does not participate in the crimping of the main plate 16 and the backup plate 17.

In the above-described configuration, the backup plate 17 supports the shutter 23 with the back thereof entirely backed, so that it can withstand the pressure of the cast concrete.

As shown in FIGS.b and c, the cylindrical portion 27 of the connecting tubular piece 26 is enlarged to a hemispherical shape 28 at the tip of the cylindrical portion 27 with respect to the mounting seat 25, and a corresponding receiving seat 29 is attached to the mounting seat 25. (Figure b)
Alternatively, the cylindrical portion 27 is bent at a predetermined angle, a flange portion 30 is formed at the tip, and a receiving seat 31 corresponding to the flange portion 30 is attached to the mounting seat 25 (see FIG. 3C), so that the head portion can be swung. It is preferable that the direction of placing concrete in the mold can be set rationally.

[Effect of the Invention] Since the present invention is configured as described above,
The following effects are obtained.

(1) The connection tube piece can be diverted immediately after the completion of concrete casting, resulting in a cost reduction effect.

In addition to (1), it is possible to select the best concrete placing direction, so that it is possible to omit manufacturing and mounting another piece by changing the press-in member and the press-in place.

[Brief description of the drawings]

Fig. 1a is an exploded view of the jig of the present invention, Figs. B and c are explanatory views of a main part of the jig, Fig. 2 is an explanatory view of a method of press-fitting concrete from below, and Figs. 4a and 4b are plan views of a part of a conventional jig, and FIGS.
It is a bb arrow line view in a figure. 1 ... through hole for concrete input, 2 ... connection flange,
3 ... rectangular main plate, 4 ... horizontal frame, 5, 6 ... connecting piece, 7
...... Through-hole, 8 ... L-shaped handle, 9 ... Shutter, 10 ...
Tightening bolts, 11 ... Mounting seat, 12 ... Hose connection tube piece,
13… Press-fitting jig, 14… Locking part, 15… Concrete insertion hole, 16… Rectangular main plate, 17… Backup plate, 18… Bending rib, 19… Weir, 20 …… through hole, 21
... gap, 22 ... through-hole, 23 ... shutter, 24 ... L
Mold handle, 25… Mounting seat, 26… Connection tube piece, 27… Tube portion,
28 ... diameter expansion, 29 ... seat, 30 ... flange, 31 ... seat.

Continuation of front page (56) References JP-A-1-62555 (JP, A) JP-A-59-38348 (JP, U) JP-B-45-2217 (JP, B1) (58) Fields investigated (Int) .Cl. ⁶ , DB name) E04G 21/02

Claims (1)

(57) [Claims] 1. A rectangular main plate screwed to a surface of a formwork having a through hole for concrete injection, and a through hole at a portion corresponding to the through hole for concrete injection, and both ends sandwiching the through hole. A backup plate that is screwed and pressed onto the rectangular main plate provided with a pair of weirs, and a through-hole corresponding to the through-holes in the lower half, and is guided by the pair of weirs to slide. A press-fit hole comprising a shutter having an L-shaped handle at one end that moves, and a connecting cylinder piece that is swingably mounted on a mounting seat that is screwed to the backup plate via a mounting seat. jig.