JPH0729291B2 - Demolding method of mortar block of semi-hardened lightweight cellular concrete - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of injecting a mortar slurry for lightweight cellular concrete into a mold to remove a semi-cured mortar block of lightweight cellular concrete from the mold. .

[Conventional technology]

Lightweight aerated concrete products have a minimum size of 1800 mm, as described in JIS A 5416, for example.
It is a large product with a width of 600 mm and contains air bubbles in the product.

In order to remove the semi-hardened mortar block of such lightweight cellular concrete from the mold, a method of individually disassembling the side plates on the four sides of the conventional mold has been widely used.

A semi-hardened lightweight aerated concrete mortar block created in a formwork constructed by placing it on the formwork bottom plate using an integrated sideframe with four side plates integrated In the method, the mortar block easily lifted up together with the integrated side plate, which was a problem in practical use.

Japanese Unexamined Patent Publication No. 57-197110 discloses a demolding device that uses an integral side frame having a punching taper and presses the central part of a semi-hardened lightweight cellular concrete mortar block in the mold toward the bottom plate to demold it. Is proposed. However, there was no simple means to prevent the loss of the end of the mortar block or the loss of the non-muscle part and to remove the mold.

[Problems to be Solved by the Invention]

The present invention has been made in view of the above circumstances. The purpose is to remove a semi-hardened mortar block from a side frame with integrated four side plates without disassembling it into individual side plates when manufacturing lightweight aerated concrete (ALC) products. The purpose of this study is to propose a method that can easily remove the mold from the mortar block of semi-hardened lightweight aerated concrete, which is highly durable.

[Means for Solving the Problems]

As shown in FIG. 1, the method of demolding a semi-hardened lightweight cellular concrete mortar block according to the present invention includes four side plates.
The integral side frame 4 in which 2, 3 are integrated is placed on the form bottom plate 1 to form the form 5, and after the mortar slurry for lightweight cellular concrete is poured into this form and semi-cured, At the time of demolding, the integrated side frame 4 which is not integrated with the mold bottom plate is pulled upward and the mortar block 6 is left on the frame bottom plate. In addition, d / L = (0.3 to 5.0) / 1000 (with a mortar block of semi-cured lightweight cellular concrete in which the central portions of the opposite side long side plates 2 and 2 of the integral side frame 4 are expanded outward. Here, d is a gap between the mortar block and the side plate, and L is a small gap having a length of the long side plate).

A mold for a lightweight cellular concrete mortar block used in the present invention is a mold composed of a mold bottom plate and an integral side frame in which four side plates arranged on the mold bottom plate are integrated. Further, an enlarging device is arranged on the side frame to expand the two side long side plates facing each other of the side frame outward.

The expanding device for expanding the side frame in the outward direction is not particularly limited, but the mold to which this device is attached is, for example, the second,
It is shown in Fig. 3.

This formwork forms a formwork 5 by arranging an integral side frame 4 with a grooved steel 7 attached to the outer surface and reinforced on the formwork bottom plate 1, and the central portion of the two long side plates 2, 2 which oppose each other. A magnifying device 8 spanning between is arranged. The magnifying device 8 includes two horizontal plates 9 in the horizontal direction,
A frame body 11 is composed of 9 and two vertical leg plates 10 and 10 fixed to both ends of the frame 9, and a guide pin 13 is provided between one leg plate 10 and a bracket 12 hanging from the lower horizontal plate 9. , A magnifying jig that is moved by being screwed by the rotation of the handle 14
16 are provided. In this enlargement device, the lower end of one leg plate 10 is fitted and locked in a locking groove 17 protruding from the upper surface of a channel steel 7 attached to one long side plate 2, and the other expansion jig 16 is provided. The lower end of the side leg plate 10 is slidably placed on the upper surface of the channel steel 7 on the other long side plate 2 side. Handle in this structure
14 is turned to move the expansion jig 16 outward along the guide pin 13, and the expansion jig 16 is pressed against the inner surface of the long side plate 2,
The long side plates 2, 2 can be spread outward by using the center of the long side plates 2, 2 as a fulcrum.

Further, instead of the enlargement jig 16, the long side plates 2 and the leg plates 10 can be tightened with a shrimp and the like to push and spread the long side plates 2, 2.

FIG. 4 shows a form fitted with another magnifying device. This formwork 5 is a hydraulic cylinder 1 that extends between the central parts of the long side plates 2 and 2.
A magnifying device 8 consisting of 8 is arranged. Locking pieces 20, 20 are attached to the base end of the hydraulic cylinder 18 and the tip of the expanding and contracting plunger 19, and the locking pieces 20, 20 are attached to the upper surface of the channel steel 7 attached to the outside of the side plate 2. Projected locking groove 17,17
It is fitted and locked in. This form also extends the hydraulic cylinder 18 and the long side plates 2, 2 to which the two locking pieces 20, 20 are locked.
The long side plates 2, 2 can be pushed outward with the central portion of the as a fulcrum.

The mold releasing method of the present invention described above will be described in more detail by using this form, for example, the form fitted with the enlargement device shown in FIGS. 2 and 3, in order to remove the mold, as shown in FIG. With the device 8, the central parts of the long side plates 2, 2 are used as fulcrums to expand outward, and the integrated side frame 4 is formed with a small gap provided between the mortar block 6 and the semi-hardened lightweight cellular concrete. Grasp it with the gripper 21 and pull it up vertically with a crane to remove it.

At this time, the vertical guide rods 23, 2 are attached to the table 22 below the form bottom plate 1.
It is preferable to project 3 and to guide the pulling in the vertical direction along the guide groove 24 formed in the short piece side plates 3 and 3 along the guide rod 23, which is preferable because accurate pulling can be easily performed.

In addition, the gap between the two grippers holding the central part of the long side plate is enlarged, the side plate is expanded, and a small gap is provided between the side plate and the mortar block of semi-cured lightweight cellular concrete,
In this state, the mold can be lifted up and removed from the mold.

In the present invention, the width by which the central portion of the opposing two long side plates is expanded outward, that is, the gap (d) between the mortar block of semi-hardened lightweight cellular concrete and the long side plate is the length of the long side plate ( L) (see FIG. 1), d / L = (0.3-
5.0) / 1000.

It seems that the mortar block of semi-hardened lightweight cellular concrete is liable to be damaged due to the strain on the short side edges caused by the expansion of the long side plates, but in the range of d / L = (0.3 to 5.0) / 1000 The semi-hardened lightweight aerated concrete mortar block plastically deforms and follows the strain, and the block is not damaged.

More preferably, d / L = (0.3 to 5.0) / 1000.

〔Example〕

The integrated side frame is tapered except for the one long side plate, straddles between the central parts of the two long side plates, and the integrated side frame (long side) is installed as shown in FIGS. 2 and 3. 4000mm,
A short side of 1800 mm) was used and placed on the bottom plate to form a mold.
A mold release agent was applied to this mold in advance, a reinforcing bar cage was arranged, and then a mortar slurry for lightweight cellular concrete having a water content of 70 parts by weight and a solid content of 100 parts by weight was injected. After hardening this mortar, rotate the handle of the magnifying device and press the magnifying jig against the inner surface of the long side plate of the integral side frame to expand it outward.
A small gap of 10 mm (d / L = 0.25 / 1000) was provided between the mortar of semi-hardened lightweight cellular concrete and the side plate. In this state, the integrated side frame was gripped by the gripper and pulled up in the vertical direction to remove the mold. At this time, the short side of the integral side frame was guided along the guide bar as shown in FIG. 5 to guide the pulling in the vertical direction.

A large ALC plate block with no defects on the bottom plate of the form was obtained.

〔The invention's effect〕

The present invention is as described above, having a bubble, the mold release of the semi-hardened lightweight cellular concrete mortar block, which is likely to cause block loss even with a slight deformation, with high productivity,
This can be achieved by using a simple method and device without causing a defective portion in the block.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view of a formwork schematically showing a state where the side plate is expanded, FIGS. 2 and 3 are perspective and vertical cross-sectional views of the formwork to which an expansion device is attached, and FIG. FIG. 5 is a perspective view of a mold to which an enlarging device is attached, and FIG. 5 is a perspective view of the mold for pulling up and removing the integral side frame. 1 ... Form bottom plate, 2 ... Long side plate, 3 ... Short side plate, 4
…… Integral side frame, 5 …… Form, 6 …… Semi-hardened lightweight cellular concrete mortar block, 7 …… Channel steel, 8 ・ ・ ・
… Enlargement device, 9 …… Horizontal plate, 10 …… Leg plate, 11 …… Frame body,
12 …… Bracket, 13 …… Guide pin, 14 …… Handle, 15 …… Screw, 16 …… Enlargement jig, 17 …… Locking groove, 18…
… Hydraulic cylinder, 19… Plunger, 20… Locking piece, 21… Gripper, 22… Stand, 23… Guide rod, 24…
... Guide groove d ... Small gap between mortar block of semi-hardened lightweight cellular concrete and side plate, L ... Length of one side plate.

Claims (1)

[Claims] 1. An integral side frame, in which four side plates are integrated, is placed on a form bottom plate to form a form, and after mortar slurry for lightweight cellular concrete is poured into the form and semi-cured. In the method of removing the mold by pulling up the integral side plate upward and leaving the semi-cured mortar block on the form bottom plate, when removing the mold, of the integral side frame that is not integrated with the form bottom plate. The opposite side of the long side is expanded to the outside with the central part of the side plate extended and d / L = (0.3-5.0) / 1000 (where d is the mortar block and the side plate). A method for demolding a mortar block of semi-hardened lightweight cellular concrete, characterized in that a small gap having a gap, L is the length of a long side plate, is provided.