JPS59230709A - Manufacture of box body vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Technical field The present invention relates to a comparative example of the invention, which is manufactured by pouring concrete, molten metal, or other hardening fluid into a mold and solidifying it, such as a fire prevention water tank or a radioactive waste storage container. The present invention relates to a method of manufacturing a thick-walled box container.

(b) Prior Art For example, when manufacturing concrete containers, conventionally, an outer frame and an inner frame, each of which can be divided into two or three parts, are assembled, the inner frame is inserted into the outer frame and suspended, and concrete is poured into the gap between the two frames. A method is used in which both frames are disassembled again after a considerable period of curing time (usually about 1 to 2 days) after being implanted and demolded. However, in this method, the formwork is disassembled and reassembled, which is not only inefficient, but also the quality of the product varies due to the use of divided formwork, resulting in poor accuracy.
Moreover, there were problems such as poor operability of the formwork due to waiting time for the concrete to harden.

In addition, when manufacturing metal boxes made of lead, aluminum, etc., sand molds are usually used as molds.1. The method used is to float a core in a sand mold to form the hollow part of the box and then cast molten metal into it, but this method requires making a mold each time it is cast, which is extremely time consuming. Poor workability. Although molds are sometimes used, especially when casting deep-bottomed cases, it is not possible to pull out the mold and remove it all at once.

It was necessary to construct the mold so that it could be divided or to attach a protruding bottle to the mold to gradually remove the mold.

(C) Disclosure of the Invention In order to eliminate the above-mentioned problems, the present invention eliminates the work of assembling and disassembling the formwork, making it easier to attach and detach the formwork, and
In particular, when manufacturing concrete boxes, there is only a short waiting time for the concrete to harden, making continuous production possible, making it possible to obtain concrete boxes of excellent quality, and also to manufacture cases made of lead or other metals. The present invention proposes a method that can easily remove the mold even when a body container is cast.

That is, the present invention has an outer frame of a casing which has an opening in the center of the bottom plate, an air pipe equipped with a hanging fitting connected to the opening from the outside, and a check valve inside, and a hanging fitting provided at the head. Another air supply pipe is inserted and fixed into the axial center, its lower end is connected to the opening in the center of the bottom plate, and the inner frame of the housing provided with two valves is inserted and suspended outside the opening. A hardening fluid such as concrete or molten metal is poured between the outer frame and the inner frame, and after hardening (to the extent that the fluid does not collapse from within the outer frame when the inner frame is removed), the inner frame is The inner frame is removed from the mold by blowing compressed air into the air supply pipe of the inner frame and jetting it from the lower end port toward the bottom of the molded case while the frame is suspended by a hanging rope.Then, the outer frame is removed from the mold. This invention relates to a method for manufacturing a box container, characterized in that the outer frame is demolded in the same manner as the inner frame by blowing compressed air into the air pipe of the outer frame with the opening side facing down.

The following describes the case of manufacturing a concrete box container as an example of the method of the present invention, but the procedure is almost the same even when a box is formed by casting molten metal or other hardening fluid. .

(d) Stream side In Fig. 1, l is the inner frame of a cylindrical (or rectangular) metal case into which the air pipe 2a is inserted and fixed in the axial center, and the center of the bottom plate 1a of the inner frame 1 is The air supply pipe 2a is opened to expose the lower end thereof to the outside, and a check valve 3a made of a suitable material such as a rubber plate capable of closing the lower end outlet of the air supply pipe 2a is located outside the center of the bottom plate 1a. is provided.Inner frame 1
The upper surface t±approximately the same conical or pyramidal shape) is fixed by welding to the intermediate portion of the air supply pipe 2a at the top t.

An air inlet 4a into the pipe 2a is provided above the air supply pipe 2a, and a hanging fitting 5a is attached to the head.

6 is a planar cross-shaped support rod disposed above the inner frame 1;
It is horizontally fixed to the air supply pipe 2a that passes through the intersection of the support rods 6, and a guide member 8 that matches the inner diameter of the outer frame 7, which will be described later, protrudes from the lower surface near each tip of the rod 6. is,
Further, each end of the rod 6 is provided with a clamp lO for clamping an outwardly facing collar 9 on the upper edge of the outer frame 7.

Reference numeral 7 denotes a cylindrical (or rectangular cylindrical) metal housing outer frame corresponding to the shape of the inner frame 1, and the bottom plate 7a of the outer frame 7 is also opened at the center, into which an air blowing port 4b is connected from the outside. A short air supply pipe 2b provided with a hanging fitting 5b is connected, and a check valve 3b similar to the above is provided inside to be able to close the outlet of the air supply pipe 2b.

Therefore, when manufacturing a concrete container, it is carried out as follows.

First, the outer frame 7 is placed on the vibration table 11 with one side of its opening facing upward, and the inner frame 1 is inserted into the outer frame 7.

If necessary, the hanging fitting 5a at the upper end of the air pipe 2a of the inner frame 1 is inserted while being suspended by the hanging rope 12, and the support rod 6 of the inner frame 1 is hung on the upper edge of the outer frame 7.

At this time, the guide member 8 on the lower surface of the support rod 6 is fitted inside the periphery of the outer frame 7-11, and
is firmly clamped by the clamping fittings 1o at each end of the support rod 6. As a result, the inner frame 1 is suspended within the outer frame 7 by the support rods 6 and positioned accurately.

Next, while operating the vibrating table 11, the space formed between the outer frame 7 and the inner frame 1 is kneaded with a hard material (for example, slump 0).
Fresh concrete 13 of cI11) is poured and compacted.

After curing (about 1 to 2 hours) to the extent that the concrete 13 does not completely harden and at least does not collapse from inside the outer frame 7 when the inner frame 1 is removed, the clamping fittings 10 are removed and the concrete is hung. The inner frame 1 is suspended by a hanging rope 12 connected to a metal fitting 5a, and compressed air is blown into the air pipe 2a from the air inlet 4a, and the bottom surface of the box body, which is being formed with concrete 13, is blown from the lower end of the air outlet of the pipe 2a. The inner frame 1 is pulled out from the outer frame 7 while ejecting it toward the target (Fig. 2 (a)). That is, the inner frame 1 is not forcibly pulled out by the hanging rope 12, but the pushing up force of the air discharged from the air pipe 2a is used. This prevents concrete that has not yet completely solidified from collapsing.

After the inner frame 1 has been removed from the mold, after some further curing,
Place the outer frame 7 on the stand 14 with the opening side facing down.
b)) In the same way as the molding of the inner frame 1, the outer frame 7 is demolded while blowing compressed air into the air pipe 2b and ejecting it toward the outer bottom of the concrete box 13 (the second Figure (c)).

In this case, depending on the degree of hardening of the concrete box 13, compressed air may be blown into the box 13 from the stand 14 to prevent the concrete from collapsing.

In addition, when curing the concrete, heating may be performed if necessary, and the outer surface of the frame 1 and the inner surface of the frame 7 may be coated with oil in advance so that the inner frame 1 and the outer frame 7 can be easily demolded. It's even better if you leave it on.

In addition, when demolding both frames 1° and 7, a weight that is equal to or slightly heavier than the weight of the frame 1 or 7 is balanced via a pulley, and the frame 1 is , 7 can also be made to levitate.

The following has explained the manufacture of concrete boxes, but there are also cases where the box is formed by casting molten metal such as lead (in this case, the vibration table 11 is not required) or when a ceramic box is cast. Almost the same operation is performed when molding.

(e) Effects of the Invention As described below, the method of the present invention assembles both the inner and outer formwork one by one when forming a box container by pouring a hardening fluid such as concrete or molten metal into the formwork.

There is no need to disassemble the molds, and the molding of both molds is done by discharging compressed air from the molds, so there is no risk of the molded box breaking even if it is removed from the mold before it is completely cured. do not have.

Therefore, according to the method of the present invention, the operation is simple and the box container can be manufactured in a shorter time than conventional methods, which improves the utilization rate of the formwork and provides uniform products with excellent quality. ,
Furthermore, the formwork used has various advantages such as a simple structure and low manufacturing cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of the apparatus used in the method of the present invention, and FIGS. 2(A) to 2(C) are explanatory diagrams showing the construction order. Symbol explanation 1-Inner frame 2-Air pipe 3-Inverted 1-tooth valve 4-Air inlet 5-Hanging fitting 6-Support rod 7-Outer frame 8-Guide member
9-Outward collar 10-Holding bracket 11-Vibration table 12
- Suspension rope 13 - Concrete (box) 14 Patent applicant Dowa Mining Co., Ltd. Figure 1 R] 2- (c)

Claims (5)

[Claims] (1) The center of the bottom plate is opened, an air pipe equipped with a hanging fitting is connected to the opening on the outside, and a check valve is installed on the inside.A hanging fitting is provided on the head inside the outer frame of the casing. Another air supply pipe is inserted and fixed into the shaft center, its lower end is connected to the opening in the center of the bottom plate, and the housing inner frame, which has a check valve provided on the outside of the opening, is inserted and suspended, and the outer frame and the inner A hardening fluid such as concrete or molten metal is poured between the frame and the inner frame is hardened to the extent that it will not collapse from within the outer frame when the inner frame is removed, and then the inner frame is suspended with a hanging rope. Then, blow compressed air into the air pipe of the inner frame and blow it out from the lower end of the air pipe toward the bottom of the molded case while removing the inner frame, and then place the outer frame with its opening side facing down. A method for manufacturing a box container, characterized in that compressed air is blown into the air pipe of the outer frame, and the outer frame is demolded in the same manner as the inner frame. (2) When demolding the inner frame and outer frame, balance a weight that is equal to or slightly heavier than each frame via a pulley, and use the upward force of the compressed air to lift each frame. A method for manufacturing a box container according to claim 1, wherein the box container is made to float. (3) The method for manufacturing a box container according to claim 1 or 2, wherein compressed air is simultaneously blown into the inside of the box to be molded when the outer frame is demolded. . (4) The hardening fluid is extremely hard mixed concrete, and when pouring the concrete between the outer frame and the inner frame, a vibrating table on which the outer frame is placed is operated to compact it. A method for manufacturing a box container according to claim 1, 2, or 3. (5) The outer surface of the inner frame and the inner surface of the outer frame are coated with oil in advance.
A method for producing a box container according to paragraph 3, paragraph 3 or paragraph 4.