TWI635942B - Drawing method and structure of patterns for low-level radioactive waste disposal container - Google Patents

Abstract

The present invention relates to a demolding method for a low-radioactive waste disposal container and a die structure thereof, which are used in the preparation of a low-radioactive waste disposal container, using a mold having a structure in which a refrigerant can be injected. By means of the refrigerant, the inner casing in the mold is thermally expanded and contracted, thereby reducing the influence of the concrete on the surface of the inner casing, thereby detaching the finished product of the low-level radioactive waste disposal container and achieving the purpose of demoulding. In combination with a specific concrete composition, the demolding method and its mold structure can be applied to the production of a disposal container suitable for storing radioactive waste.

Description

Demoulding method for low-level radioactive waste disposal container and die structure thereof

The invention relates to a demoulding method and a die structure thereof, in particular to a demolding method for a low-radioactive waste disposal container and a die structure thereof.

Today, concrete is the most widely used and largest building material in civil engineering. Although it is defined as a durable material, it is essentially a non-uniform porous material. Under the attack of carbon dioxide, water, chloride, sulfate, etc., it is inevitably corroded by external factors. Concrete will be greatly shortened due to accelerated damage to the structure.

Therefore, if concrete is to be used in a harsh environment, it is necessary to improve performance through its specific distribution ratio. The so-called harsh environment includes places or applications where high temperature, high humidity, high pressure, high salinity or high radiation are present, resulting in rapid collapse of the concrete structure, taking the low-level waste disposal container as an example. It will lead to the leakage of content, so how to strengthen the nature of concrete is the key project of research and development in related fields.

In the process of preparing concrete into a container, there are also difficulties in it, especially when the concrete is solidified, it is not easy to be detached from the mold, and the volume and weight of the container for treating the low-level radioactive waste are far greater than that of the general container. Therefore, the preparation process requires the participation of mechanical equipment. Therefore, if the mold is strongly released from the mold, the structure of the low-level waste disposal container may be damaged due to excessive pulling, or the mold may be unusable.

In summary, in the prior art, a multi-piece unit is used to form a mold to remove the piece by piece after the concrete is solidified, but the more the unit, the more trouble of demolding and assembling the mold. Therefore, it is necessary to further improve the adsorption force between the mold and the solidified concrete, and to overcome the problem that the mold and the concrete are not easily separated.

The main object of the present invention is to provide a demolding method for a low-radioactive waste disposal container and a die structure thereof, which are used for preparing a low-radioactive waste disposal container by using a mold having a structure capable of injecting a refrigerant, by freezing The agent is detached from the finished product of the low-level radioactive waste disposal container by thermal expansion and contraction, thereby achieving the purpose of demoulding.

A secondary object of the present invention is to provide a demolding method for a low-level radioactive waste disposal container and a die structure thereof, which do not deplete the mold during the demolding process, and thus can repeatedly utilize a specific mold to realize low-level radioactive waste. The mass production of the disposal container can reduce the production cost of the low-level radioactive waste disposal container; and the use of the release agent can also be omitted.

Another object of the present invention is to provide a demolding method for a low-level radioactive waste disposal container and a die structure thereof, which are used in the field of radioactive waste disposal, and the low-radioactive waste disposal container has high pressure resistance. Strength, high splitting tensile strength, resistance to drying shrinkage, low water permeability, high heat load resistance, fall resistance, chemical resistance, radiation resistance, resistance to chloride ion attack, sulfate attack and migration resistance, so it is suitable for storage Radioactive waste.

In order to achieve the above object, the present invention discloses a demoulding method for concrete, the steps of which include: mounting an inner casing on a base, the inner casing is provided with a first through hole, and the inner casing is provided with a first receiving space is disposed between the first through holes; an outer casing is disposed on the base, and a second through hole is disposed on the outer casing, the outer casing is disposed on the inner casing to have a second accommodating space; injecting a concrete slurry into the second accommodating space; solidifying the concrete slurry in the second accommodating space; injecting a refrigerant into the first accommodating space to make the inner The volume of the housing is reduced; and the inner housing and the outer housing are removed.

The mold structure of the low-level waste disposal container includes: a base; an inner casing disposed on the base, the inner casing is provided with a first through hole, the inner casing and the first a first accommodating space is disposed between the through holes, and a refrigerant is disposed; and an outer casing is disposed on the base, the outer casing is provided with a second through hole, and the outer casing covers the inner casing The body has a second accommodating space for accommodating a concrete slurry.

In order to give your reviewers a better understanding and understanding of the features and effects of the present invention, please refer to the examples and supporting instructions for explanations as follows:

Please refer to FIG. 1 , which is a flow chart of an embodiment of the present invention. As shown in the figure, the demolding method and mold structure of the low-level radioactive waste disposal container disclosed by the present invention comprises the following steps:

S1: installing the inner casing on the base;

S2: a combined fixed outer casing;

S3: flipping the outer casing into the upper casing and inserting the outer casing into the outer casing;

S4: flipping again to form a concrete mold;

S5: injecting a concrete slurry into the concrete mold;

S6: curing the concrete slurry in the second accommodating space;

S7: flipping the concrete mold and removing the base;

S8: injecting a refrigerant into the inner casing;

S9: removing the inner casing and the outer casing to obtain a finished concrete product.

As shown in step S1, an inner casing 20 is provided with a first through hole 21 (shown in FIG. 2B) disposed on a base 40 (shown in FIG. 3A), wherein the inner casing A first accommodating space 31 is disposed between the body 20 and the sidewall of the first through hole 21, and then, as shown in step S2, the outer casing units 10A, 10B are combined to form an outer casing 10, and the outer casing is provided with a second a through hole 22 (as shown in FIGS. 2A and 3B), and inverting the inner casing 20 and the base 40 in step S3 so that the base 40 is above, and the inner casing 20 is inserted downward into the outer casing 10 a second through hole 22 (as shown in FIG. 3C ), and the outer casing 10 and the inner casing 20 are placed against the base 40 and disposed, and then, as shown in step S4 , the base 40 is turned down again, The outer casing 10 and the inner casing 20 are above the base 40, thereby forming a concrete module 50. As shown in step S5, a concrete slurry P is injected between the inner casing 20 and the outer casing 10. a second accommodating space 32 (as shown in FIG. 3C), and then, as shown in step S6, the concrete slurry P is allowed to stand, and the concrete slurry P is solidified into a concrete product 60. In step S7, the base 40 is turned over and removed as a whole, and then a refrigerant C is injected into the first accommodating space 31 of the inner casing 20 through the injection port 201 of the inner casing 20 as shown in step S8. The inner casing 20 is slightly contracted by the heat expansion and contraction principle (as shown in FIG. 3D), and thus, as shown in step S9, the inner casing 20 and the outer casing 10 are successively removed to The finished concrete product 60 (as shown in Figure 3E) is obtained as a low level radioactive waste disposal container.

However, in order to achieve the above steps, the present invention is matched with a mold having a special structure, so that the refrigerant can be efficiently injected into the mold, so that the cured low-level waste disposal container can be conveniently separated from the mold, and the mold can be ensured. Continue to use to continuously manufacture other low-level radioactive waste disposal containers of the same appearance.

Next, referring to FIGS. 2A and 2B, the container disclosed in the present invention structurally includes an outer casing 10 and an inner casing 20. The outer casing 10 is composed of at least two outer casing units 10A, 10B. The outer casing units 10A, 10B can be fixedly coupled through a plurality of locking devices (not shown), but are not limited thereto. As shown in FIG. 2B , the inner casing 20 is disposed in the outer casing 10 , and is provided with a first through hole 21 , wherein a first space is disposed between the inner casing 20 and the sidewall of the first through hole 21 . The accommodating space 31, an injection port 201 and an extraction port 202 are used for injecting and withdrawing a refrigerant C.

In the actual application, the outer casing 10 is fixed in advance (10A, 10B), and then the inner casing 20 is mounted on the base 40, and then the base 40 is turned over, The inner casing 20 is inserted into a second through hole 22 in a lower manner, and the outer casing is disposed on the inner casing to have a second receiving space 32. Then, it is turned over again to form a concrete mold 50, and the concrete slurry P is poured into the second accommodating space 32; after it is solidified, the concrete mold 50 is turned over and the base 40 is removed, from the note The inlet 201 injects the refrigerant C for demolding, and as shown in Figs. 3A-3D, the inner casing 20 and the outer casing 10 are removed to obtain a concrete product 60. As shown in Figure 3E. However, the above-described module structure and application mode are a preferred embodiment of the present invention, and the present invention is not limited to the housing shape shown in the drawings.

The material of the constituent elements of the above mold may be plastic, rubber or metal, and metal is preferred, but considering the characteristics of cold expansion and contraction, in this embodiment, metals such as pig iron, bismuth, antimony, gallium, etc. are excluded. Use. In addition, the inner casing 20 is not limited to being integrally formed, and may be composed of a plurality of inner casing units, which are separately detached when demolding.

In the demolding technology of concrete, it is difficult to separate the inner casing 20 from the concrete product 60; and the concrete product 60 has a container shape, and when the concrete slurry P is solidified, the outer casing 10 can be easily separated from the surface of the finished concrete product, but the inner casing 20 located inside the container-like finished product is affected by factors such as the adsorption force of the concrete and the disassembly direction, and the inner casing 20 is difficult to be disassembled. Sex. If the removal is forced, the finished concrete or the inner casing 20 is damaged. Therefore, the present invention utilizes the second accommodating space 32 between the outer casing 10 and the inner casing 20 for accommodating the concrete slurry, and additionally utilizes the first of the inner casing 20 itself. The accommodating space 31 is for accommodating the refrigerant C.

In a preferred embodiment of the present invention, the injection port 201 and the extraction port 202 included in the inner casing 20 are in communication with the first accommodating space 31, so that the refrigerant C can pass through the injection port 201. It is injected into the first accommodating space 31 and is extracted through the pumping port 202. Further, in the preferred embodiment, the inlet 201 and the extraction port 202 are connected to a freezing device (not shown) to automatically control the refrigerant C in the first housing space 31. Injecting and withdrawing, and additionally monitoring whether the refrigerant C is recycled or not.

The step of the demolding method of the low-level radioactive waste disposal container disclosed above is performed, when the non-solid concrete slurry P is injected into the outer casing 10 at a normal temperature and the inner casing 20 is assembled When the second accommodating space 32 is formed between the two, the inner casing 20 has an outer diameter R. After the concrete slurry P is in the second accommodating space 32 for a period of time, the moisture is removed and solidified into a solid concrete product having a certain volume and shape, and the refrigerant C is injected into the first volume. Placed in space 31. The temperature of the refrigerant C is much lower than room temperature (the original temperature of the inner casing 20), which causes the inner casing 20 to be reduced in size, and the outer diameter is slightly reduced to R1 and R>R1, so that the diameter can be greatly reduced. The adsorption force of the concrete slurry P on the outer surface of the inner casing 20 can be separated from the concrete product 60 by mechanical pulling of the inner casing 20, for example, the inner casing 20 can be lifted upward.

In a preferred embodiment of the present invention, the first accommodating space 31 surrounds the inner portion of the inner casing 20 to improve the stability of the inner casing 20. The housing 20 can be shrunk in a relatively even manner.

In a preferred embodiment of the present invention, a low-level radioactive waste disposal container for storing a radioactive object is used, which is used in the field of radioactive waste accommodation, and therefore requires high compressive strength and high enthalpy. Low-level radioactive waste disposal container with tensile strength, dry shrinkage resistance, low water permeability, high heat load resistance, fall resistance, chemical resistance, radiation resistance, resistance to chloride ion attack, sulfate attack and nuclear migration resistance. This type of low-level radioactive waste disposal container uses a specific concrete composition, wherein the composition of the concrete slurry P per cubic meter comprises: cementing material, which contains 300-350 kg of cement and 70-90 kg. Furnace powder; Buzhuo material, which contains 125-140 kg of fly ash and 24~28 kg of ash; fine granules, which contain 900-960 kg of sand; coarse grain, which contains 700~ 780 kg of stone; steel fiber, which weighs 115 to 120 kg; and water, which weighs 130 to 140 kg. Among them, the cement material in the slurry contains cement and hearth powder, while the material used in the slurry contains fly ash and ash. The cement is a Portland cement that conforms to the CNS 61 standard type I (generally used for non-specific purposes); the fly ash is F-class fly ash according to CNS 3036; the hearth powder is in compliance with CNS 12549, It is a water quenching furnace powder with a specific surface area of 3000~5000 square centimeters per gram; the ash is in accordance with CNS15648 and is not compacted ash; as for mixing water, the mixing water used must comply with CNS 13961.

In summary, the present invention discloses in detail a demolding method of a low-level radioactive waste disposal container and a die structure thereof, which can benefit the thermal expansion of the inner casing of the concrete mold through the special design of the mold structure and the use of the refrigerant. The principle of shrinkage, and when disassembling the inner casing located inside the finished product of the low-level radioactive waste disposal container, it is less affected by the adsorption force between the concrete and the outer surface of the inner casing, and the inner casing is relatively easy to be The body is pulled and separated from the finished concrete. The demolding method and the die structure of the low-level radioactive waste disposal container disclosed by the invention can ensure the quality of the finished concrete product and reduce the replacement rate of the mold, so it is indeed a low-radioactive waste disposal container with application value. The demoulding method and its mold structure.

Therefore, the present invention is a novelty, progressive and available for industrial use. It should be in accordance with the requirements of patent applications for patent law in China. It is undoubtedly to file an invention patent application according to law, and the Prayer Council will grant patents as soon as possible.

The above is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, so that the shapes, structures, features, and spirits described in the claims of the present invention are equally changed and modified. All should be included in the scope of the patent application of the present invention.

10‧‧‧Outer casing
10A, 10B‧‧‧ outer casing unit
20‧‧‧ inner casing
201‧‧‧Injection
202‧‧‧Extracted
21‧‧‧First through hole
22‧‧‧Second through hole
31‧‧‧First accommodation space
32‧‧‧Second accommodation space
40‧‧‧Base
50‧‧‧Concrete mould
60‧‧‧Concrete finished products
C‧‧‧Refrigerant
P‧‧‧Concrete slurry
R, R1‧‧‧ OD

Figure 1 is a flow chart showing an embodiment of the present invention; Figure 2A-2B is a structural view of a low-level waste disposal container according to an embodiment of the present invention; Figure 3A-3E: An actual application diagram of a concrete mold according to an embodiment of the present invention;

Claims (10)

A method for releasing a low-radioactive waste disposal container, the method comprising: installing an inner casing on a base, wherein the inner casing is provided with a first through hole, the inner casing and the first through hole a first accommodating space is disposed between the accommodating body and the outer casing; a second through hole is disposed on the outer casing, and the outer casing is disposed on the inner casing to have a second accommodating Filling a concrete slurry into the second accommodating space; solidifying the concrete slurry in the second accommodating space; injecting a refrigerant into the first accommodating space to reduce the volume of the inner casing And removing the inner casing and the outer casing. The method for releasing a low-level radioactive waste disposal container according to claim 1, wherein the concrete slurry is injected and the refrigerant is injected and further inverted. The demolding method of the low-level waste disposal container according to claim 1, wherein the concrete slurry is further removed after the concrete slurry is cured. The method for demolding a low-level radioactive waste disposal container according to claim 1, wherein the first accommodating space comprises an injection port and an extraction port for injecting and withdrawing the refrigerant. A mold structure for a low-radioactive waste disposal container, comprising: a base; an inner casing disposed on the base, the inner casing is provided with a first through hole, the inner casing and the first a first accommodating space is disposed between the through holes to accommodate a refrigerant; and an outer casing is disposed on the base, the outer casing is provided with a second through hole, and the outer casing covers the inner casing The utility model has a second accommodating space for accommodating a concrete slurry. The mold structure of the low-level radioactive waste disposal container according to claim 5, wherein the mold structure is further turned over before the outer casing is disposed on the base. The mold structure of the low-level radioactive waste disposal container according to claim 5, wherein the first accommodating space comprises an injection port and an extraction port for injecting and withdrawing the refrigerant. The mold structure of the low-level waste disposal container according to claim 5, wherein the inner casing is further connected to a freezing device, and the freezing device injects and withdraws the refrigerant in the first accommodating space. among. The mold structure of the low-level waste disposal container according to claim 5, wherein the cubic meter of the concrete slurry comprises: a cement material comprising 300-350 kg of cement and 70-90 kg. Furnace powder; Bu 岚 material, which contains 125-140 kg of fly ash and 24~28 kg of ash; fine granules, which contain 900-960 kg of sand; coarse granules, which contain 700~ 780 kg of stone; steel fiber, which weighs 115 to 120 kg; and water, which weighs 130 to 140 kg. The mold structure of the low-level waste disposal container according to claim 5, wherein the concrete slurry is solidified in the second accommodation space to form a container of a radioactive object.