JPH0469205A - Deframing device for inner frame in concrete formwork - Google Patents

Abstract

PURPOSE:To easily release a concrete product from a formwork by transferring the parts present in the symmetrical positions of an inner frame to the inner part at proper width and on the other hand, erecting a supporting plate on a pedestal in the center of the inner frame and rotating an operation shaft supported to the supporting plate and retreating a movable frame to the inside of the inner frame. CONSTITUTION:The respective corner parts present on the diagonal line of an inner frame 3 are divided to provide the movable frames 5. Two sheets of engaging plates 6 are provided symmetrically and continuously to the rear thereof while keeping the proper interval. On the other hand, two sheets of supporting plates 10 are erected on a pedestal 4 in the center of the inside of the inner frame 3. An operation shaft 11 is penetrated between the supporting plates 10. The rotary plates 13 are axially supported so that these are rotated together with the operation shaft 11 toward the respective movable frames 5. Since a pair of movable frames are easily separated between a formwork and the inner frame by rotating the operation shaft 11, the inner frame is drawn near to the inside when a concrete product is hung to the upper part. Thereby deframing can be completely performed. Further the movable frames are detached and cleaning and maintenance work can be easily performed.

Description

Detailed Description of the Invention (Industrial Field) The present invention relates to a device for removing the inner frame of a concrete formwork, and particularly to a device for removing the inner frame of a concrete formwork that has an inner frame that is partially insertable and removable. Regarding frame removal equipment.

(Problems with conventional technology) Formwork for forming concrete products such as rainwater catchments and manholes consists of at least an outer frame and an inner frame, and fresh concrete is filled between the outer frame and the inner frame and hardened. It is.

In order to remove the mold after solidification, it is necessary to separate the outer frame and inner frame from the concrete product, but the outer frame must be moved toward and away from the concrete product in opposite directions, or the outer frame must be moved between the bodies around an axis provided below. Then he is taken out of the frame.

On the other hand, to remove the inner frame, a movable part called an "arrow" is provided that allows part of the inner frame to be removed inward, and after solidification is complete, this movable part is removed by hitting it with a hammer. The adhesive on the surface of the concrete product is gradually loosened by hitting the part with a hammer, and finally the product is lifted up using a clamper and removed from the mold. Therefore, not only does it take a considerable amount of time to demold the inner frame, but hammering for a long time places an excessive burden on the worker.In addition, the inner frame becomes uneven and deformed, reducing the precision of the product. In many cases, concrete products did not meet the specified dimensions.

(Means for Solving the Problems) The present invention has been made in view of the above points, and it is an object of the present invention to provide an inner frame demolding device that can remove the inner frame within a short period of time through targeted operations. The gist of this is that in a concrete formwork consisting of an inner frame placed on a base and open at the top and an outer frame provided at an appropriate distance from the inner frame, The symmetrical parts of the inner frame are divided into sections with appropriate widths so that they can be moved inward as movable frames.
A pair of engagement plates are protruded from behind the inner frame of the movable frame at an appropriate interval, and the engagement plates are cut downward from the upper edge.On the other hand, the center base of the inner frame has a support. A board was erected,
A pair of rotary plates are connected to the operating shaft supported by the support plate, and each rotary plate is loosely fitted with a joint rod having a horizontally orthogonal arm at its tip, and both ends of the arm are connected to the engagement plate. An inner frame removing device for concrete formwork, which is engaged with an engagement hole, and each inner frame other than the movable frame is loosely connected to a base by a connecting member. .

If the inner frame according to the present invention is opened upwardly,
This inner frame, which may have any shape such as a rectangular parallelepiped, cube, or cylinder, and may have sloped walls or straight walls, is simply placed on a base.

A part of the symmetrical part of this inner frame is movable inwardly as a movable frame. There is no particular restriction on the width, and it is better to have a constant width from the top edge to the bottom edge, but the top and bottom widths may be slightly different.
It is desirable to provide them at the corners of a pair of diagonals.

Behind the inner frame of this movable frame, engaging plates of the same type are arranged in parallel or symmetrically at appropriate intervals.
Each of the engagement plates is provided with an engagement hole cut out downward from its upper edge, and desirably includes a notch that descends from the upper edge and a notch that bulges in the width direction at the bottom of the engagement plate. An engagement hole is formed. The width of the notch at the part descending from the upper edge should be slightly wider than the width of the arm, and the bulging notch at the bottom should preferably correspond to the cross-sectional shape of the arm, and if it is cylindrical, It is best to expand it into an arc. A support plate is erected at the center of the inner frame. This base plate is
One support plate may be sufficient, but since a considerable force is applied, it is desirable to provide two support plates.This support plate is provided with an operating shaft that is rotatably supported. In the case of one support plate, the support plates are provided symmetrically protruding from both sides, and in the case of two support plates, the rotating shaft is bridged.

This operating shaft is provided with protruding bars at both ends, screwed with bolts, or bent appropriately so that it can be rotated by an operating handle or pipe.

A pair of rotary plates is attached to the operating shaft, and a joint rod is loosely fitted to each rotary plate.
It is equipped with an arm that is perpendicular to the horizontal. The arms are preferably cylindrical, but may have other shapes.The ends of the joints are disposed between the engagement plates, and the arms extending laterally from there are engaged with the engagement holes of the engagement plates. are combined.

When the movable frame is completely fitted into the inner frame, the arm will
It is located within the bulge of the notch at the bottom of the engagement hole on the side of the movable frame, and when the movable frame moves back, it is located on the opposite side of the notch.

Furthermore, if the movable frame is removed from the inner frame, the inner frames will form a pair and be positioned on the base with a gap equal to the movable frame, but each inner frame will be connected by a connecting member such as a chain. Since the present invention is configured as described above, first, once the fresh concrete filled in the space between the inner frame and the outer frame has solidified, the outer frame is connected to the base in a free manner. Remove the clamping device, etc., open the door in the opposite direction, and remove the outer frame. This completes the demolding of the concrete product from the outer frame.

Next, to remove the inner frame from the mold, first, the operating shaft supported by the support plate is rotated. The rotation is performed by rotating a bar or bolt connected to the operating shaft using a suitable rotating means such as a spanner or a pipe. This rotation causes a pair of rotary plates fixed to the operating shaft to rotate, and a joint rod connected thereto is drawn toward the center.

The arm formed at the tip of the joint rod engages with the engagement holes of the two engagement plates installed behind the movable frame, so move the bottom of the engagement holes to the opposite side and pull the engagement plates. Therefore, the movable frame retreats into the inner frame.

As a result, the portion of the inner frame where the movable frame has retreated opens vertically.

When a concrete product is lifted with a clamper in such a state, the inner frame attached to the concrete product is lifted upward and is restrained by the connecting member and prevented from rising. As a result, the adhesive between the inner frame and the concrete product came off.
The entire solidified concrete product is demolded from the inner frame.

Moreover, since the engagement hole of the engagement plate communicates from the upper edge of the engagement plate to the bottom, if the arm is removed from here after demolding, the movable frame becomes free and can be removed from the inner frame body.

(Example) The present invention will be described below according to an example shown in the drawings.1
2 is a concrete formwork, 2 is a pair of outer frames with doors that can be opened outward, and 3 is a rectangular inner frame. 4 is a base on which the inner frame 3 is placed.

5 is a movable frame formed by dividing each diagonal corner of the inner frame 3. Behind each movable frame 5, two engaging plates 6 are provided which are symmetrically connected at an appropriate interval.
This engagement plate 6 has a notch 7 that falls downward from the upper edge.
An engagement hole 9 consisting of an arcuate notch 8 is provided on both sides of the bottom of the notch.

On the other hand, two support plates 10 are erected on the center base 4 within the inner frame 3, and an operating shaft 11 passes through them.
Both ends of the operating shaft 11 are operating bars 12 bent at right angles.

A rotating plate 13 is fixed to the operating shaft 11 so as to rotate together with the operating shaft 11 toward each movable frame 5, and the base end of a joint rod 14 is loosely fitted onto the rotating plate 13. ing. Reference numeral 15 denotes an arm extending horizontally on both sides of the tip of the joint rod 14, and the arm 15 is engaged in the engagement hole 9 of the engagement plate 6.

16 is a chain having one end attached to the inner frame 3 and the other end loosely attached to the base 4.

(Effects) As described above, in the present invention, a part of the inner frame of the opposing parts is divided so that it can be retreated as a movable frame, and an appropriate space is left behind the inner frame of this movable frame. Engagement plates of the same type are connected, each of which has an engagement hole, and the rotary plate is connected to an operating shaft rotatably supported by a central support plate within the inner frame. A joint rod having a horizontally orthogonal arm at its tip is loosely fitted into this rotary plate, and the arm engages with the engagement hole of the engagement plate, so that by rotating the operating shaft, one pair of rods can be connected. The movable frame easily moves into and out of contact with the inner frame in a single motion, and when the movable frame retreats inside the inner frame, a gap is created between the inner frames, creating an escape room for the inner frames to approach each other. When the concrete product is lifted upward, the inner frame is moved inward, thereby completely demolding the product. In this manner, the apparatus according to the present invention can complete demolding of concrete products extremely easily and in a short time.

In addition, the engagement between the arm of the joint rod and the engagement plate can be removed because the engagement hole is connected to the upper edge, and the movable frame can be removed to facilitate cleaning and maintenance work such as removing the rubber backing. It is something that can be done.

4-base, 5-movable frame, 6-engaging plate, 7-notch, 8-
Notch, 9-engaging hole, 10-support plate, 11-operating shaft, 12
- Operation bar 13- rotating plate, 14- joint rod, 15- arm, 16- chain

Claims (5)

[Claims] (1) In a concrete formwork consisting of an inner frame placed on a base and opened at the top and an outer frame provided at an appropriate distance from the inner frame, the symmetrical portions of the inner frame are The movable frame is divided into two movable frames with a width of On the other hand, a support plate is provided upright on the base at the center of the inner frame, and a pair of rotary plates are connected to the operating shaft supported by this support plate. A joint rod having a horizontally orthogonal arm at its tip is loosely fitted into the rotary plate, and both ends of the arm engage with the engagement hole of the engagement plate, and each of the internal parts other than the movable frame part is engaged with the engagement hole of the engagement plate. An inner frame removing device for concrete formwork, characterized in that the frame is loosely connected to the base by a connecting member. (2) An inner frame removing device for concrete formwork according to claim 1, wherein the inner frame is rectangular. (3) An inner frame removing device for concrete formwork according to claim 2, characterized in that the movable frame is formed at a corner. (4) An inner frame removing device for concrete formwork according to claim 1, wherein the connecting member is a chain. (5) The inner frame removing device for concrete formwork according to claim 1, wherein the engagement hole descends from the upper edge and bulges in an arc shape on both sides at the bottom part.