JPH024773Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a cylindrical metal material used in the steel industry to pour refractory linings into molten metal containers such as molten steel ladles that store molten steel. It relates to the structure of formwork (hereinafter simply referred to as "formwork").

[Conventional technology]

It is well known that a cylindrical formwork is used when lining a ladle etc. with monolithic refractory material and heat curing is performed after construction. deformed and damaged,
Or, it may come into close contact with the lining refractory material, making it difficult to remove the frame. An improved formwork for preventing this problem is disclosed in, for example, Japanese Utility Model Application Publication No. 147669/1983.

FIG. 2 shows a plan view of the conventional formwork mounted on a ladle, and FIG. 3 is a sectional view thereof.

In the figure, 1 is a ladle, 2 is its steel shell, 3 is a laying brick, 4 is an insulating brick for the side wall, 5 is an inverted truncated cone-shaped formwork set in the center of the ladle, and a ring-shaped frame 6 is It is made by welding steel plates with a thickness of 9 to 12 mm on the outer periphery in a curved shape, and as shown in Figure 2, depending on the depth of the ladle, 3 to 4 sets of plates with slightly different diameters are stacked and used. do. 7 is a side wall construction body made of monolithic refractory material that is poured to form a side wall.

Reference numeral 8 denotes an expansion absorption mechanism installed inside the formwork to absorb the expansion of the formwork 5. A pair of formworks has an inner widening tapered part 9 with a width of 100 to 300 mm provided in two stages, upper and lower. The tapered surfaces 10a and 10b are made of strong and smooth steel plates, and a stopper 11 is provided on the outside of the tapered surface 10b. Further, reference numeral 12 denotes a door portion manufactured to fit tightly into the tapered portion 9, and its horizontal section is approximately trapezoidal, and the height of the two sets is approximately the same as the height of one set of the formwork 5. It is. One of the inner sides of the door part 12 is pivotally supported on the upper and lower parts of the tapered surface 10a so that the door part 12 can be opened and closed inside the formwork 5. The other side inside the door part 12 is the cylinder 1
The Y-shaped link member 14a of No. 3 is pivotally supported, and the tip of the other link member 14b is pivotally supported on the formwork 5. Furthermore, the cylinder 13 has a resilient support member 15.
It is pivoted almost horizontally via a mounting member.

Since the expansion absorption mechanism 8 is constructed as described above, it operates as follows. That is, as shown in FIG.
and heat-resistant hose 17 of each cylinder 13.
is connected to the hydraulic unit 18. cylinder 13
When a predetermined pressure is applied to the door section 12, the door section 12 which opens inward in the state shown in FIG.

Next, when the monolithic refractory is filled to the upper end, a strong pressing force due to its head pressure acts on the door 12, but the pressing force of the cylinder 13 is adjusted so that the door does not open inward. After filling is completed, heat curing begins and the monolithic refractory hardens, and when it is completely hardened, the head pressure applied to the door becomes zero, but
The formwork 5 thermally expands in the circumferential direction. At this time, since the construction body 7 is completely hardened, the stress generated in the expanded formwork 5 suddenly becomes extremely large. At this time, the expansion absorption mechanism 8 is activated.

That is, if the stress of the formwork 5 acting on the inclined surface of the door section 12 becomes even slightly larger than the set pressure force of the piston against the door section, the piston of the cylinder 13 will automatically contract and the door section 12 will move slightly inward. open. At the same time, the support member 15 is slightly elastically deformed, and the width of the tapered part 9 is further reduced from the initial width, and the stress in the formwork 5 is automatically absorbed as appropriate and is always kept below the set value, thereby preventing damage to the formwork. It should be kept to a minimum.

Next, we will explain how to remove the frame. After the construction body 7 is completely cured, when the door part 12 is completely pulled inward by operating the cylinder, the diameter of the formwork 5 is partially deformed inward, thereby bringing the hardened material into close contact with the formwork. is partially peeled off, creating a gap, making it possible to remove the mold with less damage to the lining wall.

[Problem that the invention attempts to solve]

In the conventional formwork as described above, when demolding, the cylinder 13 is sufficiently compressed, the door part 12 is opened inward, and the tapered part 10 of the formwork is further pulled.
From position a, the left side portion (see FIG. 2) separates from the construction body 7 and moves radially inward, but at the same time a stress is applied that pulls the support member 15 radially outward.

On the other hand, when the formwork partially moves inward, a force is applied to the support member 15 to elastically deform it inward, thereby restricting the separation of the formwork.

Even if the mounting position of the support member 15 is brought close to the center position of the ladle, due to the above-mentioned constraints, the area where the support member 15 separates is limited to approximately 90° around the circumference of the formwork, or the gap where the support member 15 separates is 2. There was a problem in that it was difficult to demold the mold because it was limited to about 8 mm.

In addition, repeated use causes permanent distortion in the entire structure of the formwork, especially around the door, which shortens the useful life of the formwork, and at the same time causes unevenness on the surface of the poured object, which adversely affects the lifespan of the object. There was a drawback.

This idea was made to solve this problem. By contracting the cylinder, the support member can move freely, and it can be separated over a wide range with a gap of several tens of millimeters, making it easy to remove the frame. The purpose is to obtain formwork.

[Means to solve the problem]

The formwork according to this invention is characterized by the mounting structure of the support member provided within the formwork. In other words, two supporting members are placed in the formwork across the cylinder and door.
The supporting members are arranged so as to form a crescent shape with the outer periphery of the formwork. However, the cylinder is pivotally supported on one support member, and nothing is provided on the other support member, and the tip of each support member is fixed to the outer periphery of the formwork on the door and cylinder side, and the other end is fixed to the outer periphery of the formwork. The space between the book supporting members is narrowed and connected to a hinge, and this hinge is fixed to the inner circumferential surface of the formwork, and as the outer circumference of the formwork moves due to thermal expansion, The book supporting member is closed, and the two supporting members are attached so as to further close inward as the mold moves inward during unframed removal.

[Function] In this invention, since the two support members are hinged to freely open and close within the formwork, the formwork expands due to heating and the door of the expansion absorption mechanism opens inward. The two support members fixed to the circumference of the formwork move in the closing direction, and then when the door is protruded inward enough during demolding, the two support members close further with almost no resistance, so the mold is closed. The circumference of the frame can be deformed significantly inwardly. The formwork is therefore separated from the construction body over a wide area.

〔Example〕

Figure 1 is a plan view showing an embodiment of this invention.
In the figure, numerals 1 to 14a and b are the same as those of the conventional mold structure. 20a and 20b are the expansion and absorption mechanism 8 (as described above, the tapered part 9, the door part 12, the cylinder 13, the link members 14a and 14
a support member disposed across the
The tips A and B on the side of the door 12 are welded to the inner peripheral surface of the formwork 5, and the other ends A' and B' on the opposite side are also welded to the formwork and are attached to the hinge 21.
The hinge 21 is fixed to the formwork.

In the formwork configured as described above, the formwork expands due to heating and the tapered part 9 narrows, and at the same time the door part 12 moves inward, and at this time the support members 20a and 20b move inward. and close slightly inward. Furthermore, when the cylinder 13 is contracted and the door portion 12 is made to protrude inwardly before the frame is removed, the supporting member 2
Since 0a and 20b are freely closed via the hinge 21, the left half of the formwork 5 as shown in the figure is greatly inflected and moved inward, and the inner surface of the construction body and the formwork are separated as shown in Fig. 22, resulting in a maximum of 50 mm. An annular gap can be formed.

In FIG. 1, the broken lines and solid lines of the support members 20a and 20b indicate the state before the mold is heated and just before the mold is removed.

[Effect of idea]

As explained above, this idea makes it possible to freely open and close the formwork support member, thereby making it possible to widen and enlarge the separation between the formwork and the construction object, making it extremely easy to remove the formwork, and furthermore, the formwork can be deformed. Since the range can be taken over half the circumference without difficulty, there is little distortion of the formwork structure, and it is easy to return to the original shape, which has the effect of increasing the durability of the formwork.

Furthermore, since no unevenness is caused on the inner surface of the poured object, it has the effect of extending its service life.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an embodiment of this invention, Figure 2 is a plan view showing an embodiment of this invention.
The figure is a plan view showing a conventional metal frame for pouring construction, and FIG. 3 is a sectional view of the same. In each figure, 1... Ladle, 5... Formwork, 7... Pour construction body, 8... Expansion absorption mechanism, 9... Taper part, 12... Door part, 13... Cylinder, 14a, b
...Link member, 20a, b... Support member, 21... Hinge, 22... Separation gap.

Claims (1)

[Scope of utility model registration request] A door portion having a substantially trapezoidal horizontal cross section and fitting into the tapered cut portion is disposed within the metal frame at a tapered cut portion that widens inward and is provided in a part of the circumferential wall of the cylindrical metal frame in the axial direction. In a metal frame that is connected to a link mechanism at the tip of a cylinder that is pivotally supported by a support member that is openable and closable, two of the support members are arranged to straddle the cylinder and the door part, and the support member is attached to the door part of the support member. A metal frame for pouring construction, characterized in that a hinge is provided on the inner peripheral surface of the metal frame, the side being fixed to the inner peripheral surface of the metal frame, and the opposite side being able to open and close the support member in the circumferential direction.