JPH0351494A - Destruction method using sublimable objects as high-speed flying objects - 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 Field of Industrial Application This invention relates to a destructive method using a sublimable object such as dry ice as a high-speed flying object.

Conventional technology For example, when demolishing an old concrete building,
Fragmentation is generally performed by mechanical impact using a construction machine equipped with an impact hammer or a swinging steel splitter.

In addition, some buildings have been put into practical use by planting gunpowder at key points and causing the explosion to shatter them. In addition, for excavating and excavating tunnels, canals, etc., construction machines such as jumbo machines equipped with many rock drills, full-section excavators, backhoes, and the explosive energy of explosives are widely used.

Further, engine-powered vines equipped with high-speed rotating blades are used for cutting paved roads made of concrete, etc., and grit blasting and sand blasting are preferably used for polishing various industrial products.

Problems to be Solved by the Invention The basic technology of the destructive method, which involves aspects such as crushing, excavation, cutting, and polishing, as mentioned earlier, has already reached a considerable level, so there is a need for new innovations to be added to this. Currently, there is almost no development in the field, and there is only room for improvement in peripheral technologies. However, when considering individual construction methods, in the case of crushing concrete buildings and excavating tunnels, the ratio between the energy expended for destruction (physical work) and the cost required to accomplish the destruction (cost performance) is generally low. Therefore, it is thought that there is a considerable latent need in the industry for a more economical and efficient construction method.

Furthermore, when a desired object is blasted and polished by grit blasting or the like, fine grit is scattered around the object, greatly impairing the working environment. Therefore, if a blast polishing method that does not deteriorate such environmental conditions could be proposed, we could fully expect demand for it. It simply responds by shielding.

Purpose of the Invention Therefore, the inventors of the present application, in view of the open problem that is expected to be improved, which is inherent in the various destructive construction methods related to the prior art described above, proceeded with consideration in search of a means to suitably solve this problem. As a result, by using a sublimable object such as dry ice as a flying object, and by flying it at high speed and colliding with the desired object, the large kinetic energy released at that time can be used to create useful controlled destruction. I came up with the idea of having them do this.

In other words, we have developed an innovative destructive method that reduces the cost required to complete the required physical work, and that does not sublimate and leave any traces after completing the work, and therefore does not contaminate the work environment. This is the main purpose of the present invention.

Means for Solving the Problems In order to overcome the above-mentioned problems and suitably achieve the intended purpose, the destruction method according to the present invention is to remove a sublimable object such as dry ice by injection pressure of high-pressure gas such as nitrogen gas. By flying at high speed and colliding this sublimable object as a high-speed flying object with a desired object, the object can be crushed, excavated, etc.
It is characterized by realizing controlled beneficial destruction/processing phenomena such as cutting and polishing.

EXAMPLE Next, the destructive method of using a sublimable object as a high-speed flying object according to the present invention will be described below with reference to a preferred example. First, the economic motives directly involved in the proposal of the present invention will be described as follows.

-3- Japan has a huge amount of liquefied natural gas (approximately 30 million tons per year).
LNG). Natural gas produced in Southeast Asia and other countries is transported in a liquefied state by LNG tankers, and then returned to a room-temperature gas state at storage terminals. Seawater is generally used for this reduction, but in doing so, a large amount of the cold energy contained in the liquefied natural gas is released into the seawater.

Therefore, a technology has been proposed to effectively utilize the cold energy industrially, and so-called LNG cold energy power generation, dry ice production, etc. have been put into practice.

Focusing on dry ice, the petrochemical industry and ammonia industry generate large amounts of carbon dioxide gas as a byproduct. Dry ice is industrially produced in large quantities by cooling and solidifying this carbon dioxide gas using the large amount of cold heat released during the reduction of liquefied natural gas as described above. At present, the dry ice obtained in this manner is mostly used as a cooling agent for cooling and preserving fresh products, and no other original uses have been found. However, since the dry ice 4 cooling market itself is small, the reality is that there is currently sufficient production capacity for dry ice.

By the way, in the liquefied natural gas (LNG) industry, a large amount of high-pressure nitrogen gas is obtained as a by-product by using the cold heat. Therefore, the inventors believe that there is currently sufficient production capacity for dry ice, that dry ice has the property of directly sublimating from a solid to a gas, and that large amounts of high-pressure nitrogen gas are produced as a by-product in the liquefied natural gas industry. Dry ice is accelerated with the high-pressure nitrogen gas to make it into a high-speed flying object, and its large kinetic energy can be used to crush concrete buildings, excavate tunnels and trenches, etc. This proposed a new destructive method that can be used for cutting various materials, polishing surfaces, removing rust, etc.

Therefore, the originality of the present invention is that, first, physical work such as crushing, drilling, cutting, and polishing is considered as part of a high-speed destruction phenomenon, and dry ice, which is produced at low cost as a by-product of the liquefied natural gas industry, etc. The object of the present invention is to provide a new destruction method that causes controlled high-speed destruction of objects by making them fly at high speed and using their high kinetic energy. The second unique feature of the present invention is that it utilizes the sublimation properties of dry ice.

That is, after completing various tasks such as crushing, excavating, cutting, and polishing, the dry ice directly vaporizes and disappears, so that the object crushed or crushed by the high-speed collision of dry ice is pure crushed pieces. Only materials and crushed materials will be obtained. There is no need to carry out excess media when excavating tunnels or cutting objects. Also, when polishing a desired object by the aforementioned grit blasting or sandblasting, by using small pieces of dry ice instead of grit or sand, the dry ice pieces quickly sublimate after the polishing work is completed.

Therefore, the problems of sandblasting and the like which harm the working environment and the difficulty of cleaning up the sand after use are solved at once.

In addition, dry ice can be used as a high-speed flying object to crush, excavate,
For use in accomplishing physical tasks such as cutting, polishing, etc.
Of course, the mechanical properties and wave characteristics of the dry ice are
It is necessary to know the stress wave propagation and interference mechanism in the object, as well as the dynamic fracture mechanism and fracture strength of the object. In this regard, the inventors conducted systematic experiments on the physical properties of dry ice, the generation, propagation, and interference of stress waves caused by collisions with high-speed projectiles, and the destruction mechanism caused by stress waves and their interference, and analyzed the results analytically. As a result, it was confirmed that high-speed flying objects made of dry ice can perform practical tasks such as crushing, digging, cutting, and polishing without any problems.

Furthermore, when destroying dry ice as a high-speed flying object, it is naturally possible to make it collide with an object only once, or to make it collide with the same object two or three times. For practical operations such as crushing, excavating, and cutting, applying shock through repeated collisions is extremely effective. In other words, the first impact causes the occurrence of main cracks in the object,
Not only does it cause growth, but it also generates countless secondary small cracks and micro-cracks. Repetitive impacts from the second time onward cause these secondary cracks and microcracks to develop further and promote fracture. Therefore, two overlapping impacts produce a three to four times greater effect than a single impact, which is clearly a great benefit in practical use.

Therefore, in order to move a sublimable object such as dry ice as a high-speed flying object, it is recommended to use the injection pressure of a high-pressure inert gas such as nitrogen gas as a driving source. In particular, nitrogen gas is more suitable because it can be obtained at low cost as a by-product of the liquefied natural gas industry as described above.

That is, for example, dry ice is formed into a cylindrical shape to form a flying object, which is loaded into a launch tube, and then the injection pressure of a high-pressure inert gas such as nitrogen gas is applied to the flying object, causing it to fly at high speed. That is what it is.

In this regard, the inventors have proposed a high-pressure gas injection mechanism as a device used for launching sublimable projectiles, and filed a patent application for this on the same date as the present application. With this device, the valve body that confines high-pressure gas in a sealed space -8- is simply moved slightly to allow part of the gas pressure to act on the valve body, and the valve body is quickly fully opened to release the high-pressure gas. This invention relates to a novel gas injection mechanism that can release the gas all at once and use the high energy to effectively launch the projectile. Furthermore, a patent application was filed on the same date as this application regarding a loading mechanism for sublimable projectiles used in a sublimable projectile launcher.

Next, regarding the destructive method of using a sublimable object as a high-speed flying object according to the present invention, specific application examples thereof are listed below.

■Crushing and crushing concrete buildings and rocks A clean and noise-reducing method of destruction is provided in place of the conventional blasting with explosives and crushing using crushers. The latent demand for this destructive construction method is expected to be quite wide, and therefore a large market exists. Furthermore, when the materials to be crushed are used as construction aggregates, the dry ice used during crushing and pulverization sublimates immediately, so that the materials to be crushed can be easily sieved.

■Drilling/open-cutting methods As mentioned above, methods such as drilling using rock drills, full-section excavators, and other explosives are used to excavate tunnels on mountainsides or underground, or to open waterways while avoiding above-ground obstacles. It has been adopted. By using high-speed flying objects made of dry ice instead of these conventional construction methods, it is possible to excavate and cut over long distances without being affected by frictional heat. In particular, since tunnels with a narrow diameter can be easily excavated, it can be effectively applied to laying gas pipes, water pipes, electric wires, telephone cables, etc.

(2) Cutting method Dry ice is used as a high-speed flying object. A super-hard cutting tool such as a ceramic chip is integrated into the tip of the dry ice, and the dry ice is flown at high speed toward a desired object.

As a result, the cutting tool piece advances while cutting the object into a desired shape, and appropriate cutting is performed.

In addition, fine particles of dry ice can be used as high-speed flying objects.
In this case, the following destructive method is proposed.

■Polishing/Cutting For example, when polishing various products, conventional grip i
By blasting with high-speed flying objects of fine dry ice particles instead of Plus 1 or Santoblasting, good polishing can be achieved without contaminating the surrounding environment and without requiring the effort of collection and separation. Moreover, by spraying fine dry ice particles at high speed along the intended cutting position of the desired object, good cutting of the object is achieved.

■Photoresist 1 by spraying fine particles of dry ice
- Membrane removal: Secondary contamination caused by stripping agents, as seen in conventional solution immersion methods, is prevented.

■Removes paint, rust, and debris from ship's sides. ■In addition to crushing ferrite for magnetic materials, it can be used in place of conventional ball mills for fine ceramics, etc.

In all of the above-mentioned crushing methods, the Trier-12 flying object directly vaporizes and disappears after completing the required work, so that contamination with impurities can be effectively prevented. Furthermore, this will lead to increased sales of dry ice that is produced in large quantities, and can reduce costs.

In the above embodiment, the case where dry ice is used as the sublimable high-speed flying object is described, but the present invention is not limited to this. In addition to nitrogen gas, various inert gases such as helium and other hydrogen gases are selected depending on economic reasons and other factors, as long as they do not affect the human body. Usable.

Claims (1)

[Claims] By making a sublimable object such as dry ice fly at high speed by the injection pressure of high-pressure gas such as nitrogen gas, and colliding this sublimable object as a high-speed flying object with a desired object, A destruction method using a sublimable object as a high-speed flying object, characterized by realizing controlled beneficial destruction/processing phenomena such as crushing, excavation, cutting, polishing, etc. on the object.