JP3607130B2

JP3607130B2 - Method and apparatus for casting irregular refractories

Info

Publication number: JP3607130B2
Application number: JP22913099A
Authority: JP
Inventors: 村尚紀角; 波誠難; 木清隆榎; 清行小松原
Original assignee: Shinagawa Refractories Co Ltd
Current assignee: Shinagawa Refractories Co Ltd
Priority date: 1999-08-13
Filing date: 1999-08-13
Publication date: 2005-01-05
Anticipated expiration: 2019-08-13
Also published as: JP2001056184A

Description

【０００１】
【発明の属する技術分野】
本発明は不定形耐火物による流し込み施工方法およびその装置に関する。
【０００２】
【従来の技術】
製鋼設備や鋳造設備などでは、溶融金属容器をはじめ各所に耐火物が用いられるが、対象箇所によっては定形耐火物（煉瓦）または不定形耐火物（キャスタブル）が選択使用されている。
【０００３】
不定形耐火物としては流し込み材が多分野において広く使用されており、この流し込み材による施工方法としては、一般に耐火粉末材料と液分とを混練ミキサにより混練し、混練された混練物を搬送用ホッパあるいはベルトコンベア等により所定の施工箇所へ搬送して流し込むようになされている。なかにはクレーンを用いて搬送する場合もある。
【０００４】
上記混練物の他の搬送手段としては、混練ミキサで混練された混練物を圧送ポンプにより圧送用配管を通じ所定の施工箇所へ圧送して流し込む圧送方式が実用化されている。
【０００５】
【発明が解決しようとする課題】
しかるに前記のホッパあるいはベルトコンベアにより混練物を搬送して流し込みを行なう施工方法では、混練ミキサの設置場所と施工箇所とが離れている場合、混練物の搬送に時間が掛り、施工に長時間を要するという問題がある。またクレーンを使用する場合はクレーンの可動範囲に大きな制約を受けるという問題がある。
【０００６】
一方、圧送ポンプによる圧送方式によれば、混練ミキサと施工箇所とが離れていても混練物を連続して搬送しながら流し込み施工を行なうことができるので施工時間の大幅な短縮を図ることができる利点があるが、その反面混練物が不定形耐火物の場合、硬化時間がコンクリートなどでは約２〜３日と長いのに比べ約３時間程度と短く、そのため混練ミキサや圧送ポンプの故障などにより圧送が中断されると混練物の硬化が徐々に進んでしまい、施工再開時に圧送不能に陥るという問題点があった。
【０００７】
本発明は上記従来技術の問題点に着目し、これを改善することを課題としてなされたもので、圧送ポンプによる不定形耐火物の圧送方式を採用しながら何らかの要因により施工が中断した場合であっても混練物の硬化に伴なうトラブルの発生をなくし、速やかに施工の再開を可能とする不定形耐火物による流し込み施工方法およびその装置を提供するにある。
【０００８】
【課題を解決するための手段】
上記課題を解決する手段として本発明は、混練ミキサにより混練された耐火材料からなる流し込み材を圧送ポンプにより圧送用配管を通じ施工箇所へ圧送して流し込み施工を行なう流し込み施工において、
硬化剤添加手段が、流し込み直前位置の前記圧送用配管の一部の外周を囲繞して付設された硬化剤添加室と、この硬化剤添加室に連通され硬化剤を供給する硬化剤供給管と、前記硬化剤添加室内に臨む配管の周面に穿設された複数個の硬化剤添加孔とで構成された硬化剤添加器とされており、前記硬化剤添加器の前記硬化剤添加孔の開口面積の総和が前記圧送用配管の内径の断面積に対し３〜１５％であり、前記混練ミキサによる混練時に耐火材料から硬化剤を除去しておき、流し込み直前時に硬化剤添加手段により混練済みの流し込み材に硬化剤を添加することを特徴とする不定形耐火物の流し込み施工方法を請求項１とし、耐火材料を混練する混練ミキサと、この混練ミキサにより混練され硬化剤を含まない流し込み材を圧送する圧送ポンプと、この圧送ポンプから流し込み施工箇所へ流し込み材を送る圧送用配管と、流し込み直前位置の前記圧送用配管に設けられた硬化剤添加手段とを具有し、前記硬化剤添加手段が、流し込み直前位置の前記圧送用配管の一部の外周を囲繞して付設された硬化剤添加室と、この硬化剤添加室に連通され硬化剤を供給する硬化剤供給管と、前記硬化剤添加室内に臨む配管の周面に穿設された複数個の硬化剤添加孔とで構成された硬化剤添加器とされており、前記硬化剤添加器の前記硬化剤添加孔の開口面積の総和が前記圧送用配管の内径の断面積に対し３〜１５％であることを特徴とする不定形耐火物の流し込み施工装置を請求項２とするものである。
【００１１】
また他の硬化剤添加手段として、流し込み直前位置に設けられ硬化剤を受け入れて前記配管を通じ圧送される流し込み材に硬化剤を添加混練する混練機としてもよい。
【００１２】
【発明の実施の形態】
以下、本発明を図面に示す実施の形態を参照して説明する。
【００１３】
図１は本発明の一実施形態の概要を示すもので、粉末の耐火材料１を受け入れて水と混練する混練ミキサ２と、この混練ミキサ２により混練された混練物（以下流し込み材という）を受け入れてこれを圧送する圧送ポンプ３と、この圧送ポンプ３の吐出口に接続される圧送用配管４（ホース）と、流し込み施工対象箇所５へ向けて流し込み材を流し込むためのノズル６とを有しており、前記配管４のノズル６に近い位置に硬化剤添加手段７が介装されている。
【００１４】
前記混練ミキサ２としては、バッチ式混練ミキサ、あるいは連続式混練ミキサを使用することができるが、連続的に流し込み施工を行なう場合には連続式混練ミキサを用いるのがよい。
【００１５】
図１における前記硬化剤添加手段７には硬化剤添加器８が用いられている。
【００１６】
この硬化剤添加器８は、図２に該添加器部分を断面とした側面図を示し、図３に図２のＡ−Ａ相当の断面図を示すように圧送用配管４の途中に介装されるもので、前後に分離された圧送用配管４，４間にフランジ９，９により接合され圧送用配管の一部を構成する短い配管１０を有し、この配管１０の外周を環状にとり巻くように硬化剤添加室１１が設けられ、この硬化剤添加室１１には硬化剤を供給するための硬化剤供給管１２が接続されている。
【００１７】
前記硬化剤添加室１１に臨む配管１０の周面には複数個の硬化剤添加孔１３，１３…が周方向に等間隔をおいて列設されており、硬化剤添加室１１内に供給される硬化剤が上記添加孔１３，１３…を通じて配管１０内を流れる流し込み材に添加されるようになっている。
【００１８】
上記硬化剤添加孔１３，１３…は３個以上設けることが望ましく、また硬化剤添加孔１３，１３…の開口面積の総和が配管１０の内径の断面積に対し３〜１５％の範囲であることが好ましい。この割合が３％未満あるいは１５％以上であると硬化剤が流し込み材に対し均一に添加することが難しくなるので好ましくない。
【００１９】
前記硬化剤は粉末あるいは液状のいずれであっても使用することができるが、その供給にはポンプ１４による圧送、またはポンプと圧縮空気１５との併用による圧送のいずれでもよい。しかし硬化剤が粉末である場合には圧縮空気の使用が必須となる。圧縮空気を併用する場合、圧縮空気の圧力は１ｋｇｆ／ｃｍ^２〜７ｋｇｆ／ｃｍ^２であることが望ましい。この圧力が１ｋｇｆ／ｃｍ^２未満であると圧縮空気を使用することによる効果が得られず、また７ｋｇｆ／ｃｍ^２を超えると流し込み材の圧送を阻害するとともに配管またはノズル６から流し込み材が飛散し、流し込み施工が難しくなる。
【００２０】
次に作用を説明する。
【００２１】
混練ミキサ２に粉末の耐火材料と水とを投入して混練し、混練された流し込み材は圧送ポンプ３へ送られて圧送ポンプ３から圧送用配管４を通じ硬化剤添加器８を通ってノズル６方向へ圧送される。
【００２２】
上記硬化剤添加器８の硬化剤添加室１１へは硬化剤供給管１２を通じて硬化剤がポンプ１４および圧縮空気１５により圧送されており、この硬化剤添加器８の配管１０内を連通する前記流し込み材中に配管１０の硬化剤添加孔１３，１３…を通じて硬化剤が添加される。
【００２３】
したがってノズル６から流し込み施工箇所５へ吐出する直前に流し込み材に硬化剤が添加されて施工箇所へ流し込まれることになり、混練ミキサ２や圧送ポンプ３が故障して流し込み材の圧送が中断しても、圧送ポンプ３から硬化剤添加器８までの圧送用配管４内に残存する流し込み材には硬化剤が含まれていず、そのため混練ミキサ２や圧送ポンプ３の故障を直して流し込み材の圧送を再開するまでの間に圧送ポンプ３や圧送用配管４内の流し込み材が硬化してしまうことがない。
【００２４】
前記流し込み材への硬化剤の添加は、配管１０の周方向に列設される複数個の硬化剤添加孔１３，１３…を通じて行なわれるので、流し込み材に対し硬化剤は平均的に万遍なく混入される。
【００２５】
上記各部の具体的寸法例を表１に比較例１、２と比較して示す。
【００２６】
【表１】

上記表１における硬化剤添加器８はノズル６の先端から１．５ｍ後部の位置に取り付け、硬化剤の添加は一定とした。
【００２７】
上記の内容により本発明によれば、硬化剤を含まない流し込み材のポンプによる圧送施工が可能であり、流し込み材の吐出直前に硬化剤が添加された流し込み材は施工後速やかに硬化することが判る。
【００２８】
図４は本発明の変形例を示すもので、硬化剤添加手段７として混練機１６を用いた場合である。この混練機１６の場合も流し込み施工を連続的に行なうには連続式混練機であることが好ましい。
【００２９】
この形態の場合も混練機１６はノズル６の直近位置に設けられ、この混練機１６に硬化剤を供給して流し込み材と混練したのち流し込み施工箇所へ流し込むようにすることができる。
【００３０】
【発明の効果】
以上説明したように本発明によれば、流し込み材を圧送ポンプにより圧送施工するについて、何らかの理由により圧送施工を中断することがあっても圧送ポンプや圧送用配管内の流し込み材が全く硬化することがないので速やかに施工を再開することができる。また圧送ポンプによる圧送施工が定常作業であれば、圧送ポンプおよび圧送用配管等の洗浄および残材処理が不要となり、配管内の材料は次回の施工にそのまま使用することができる。さらに流し込み材は硬化剤を除いてあるので流し込み材の製造時に水との混練物とすることが可能であり、そのまま混練物として施工現場へ搬入することにより近隣に混練ミキサを設置しないようにすることも可能である。
【図面の簡単な説明】
【図１】本発明の一実施形態の概要を示す側面図。
【図２】図１における硬化剤添加手段の一例を示す一部を断面とした側面図。
【図３】図２のＡ−Ａ相当の断面図。
【図４】本発明の他の実施形態の概要を示す側面図。
【符号の説明】
２混練ミキサ
３圧送ポンプ
４圧送用配管
６ノズル
７硬化剤添加手段
８硬化剤添加手段としての硬化剤添加器
１０配管
１１硬化剤添加室
１２硬化剤供給管
１３硬化剤供給孔
１６混練機[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a casting method and apparatus using an irregular refractory.
[0002]
[Prior art]
In steel making facilities and casting facilities, refractories are used in various places including molten metal containers, but depending on the target location, a regular refractory (brick) or an irregular refractory (castable) is selectively used.
[0003]
A casting material is widely used as an irregular refractory material. In general, the casting method is to knead the refractory powder material and the liquid with a kneading mixer and transport the kneaded kneaded material. It is designed to be transported and poured into a predetermined construction site by a hopper or a belt conveyor. Some of them are transported using cranes.
[0004]
As another conveying means for the kneaded material, a pumping system in which the kneaded material kneaded by the kneading mixer is pumped by a pumping pump to a predetermined construction site through a pumping pipe is put into practical use.
[0005]
[Problems to be solved by the invention]
However, in the construction method in which the kneaded material is transported by the hopper or the belt conveyor and the casting is performed, when the installation location of the kneading mixer is separated from the construction location, it takes time to transport the kneaded material, and the construction takes a long time. There is a problem that it takes. In addition, when a crane is used, there is a problem that the movable range of the crane is greatly restricted.
[0006]
On the other hand, according to the pressure-feeding system using the pressure-feeding pump, it is possible to perform the pouring work while continuously conveying the kneaded material even if the kneading mixer and the construction site are separated, so that the construction time can be greatly shortened. On the other hand, if the kneaded material is an irregular refractory, the curing time is about 3 hours shorter than that of concrete, which is about 2-3 days, which is due to a failure of the kneading mixer or pump. When the pumping is interrupted, the kneaded product gradually hardens, and there is a problem that the pumping becomes impossible when the construction is resumed.
[0007]
The present invention has been made with a focus on the above-mentioned problems of the prior art, and has been made to improve the problem. This is a case where the construction is interrupted due to some factors while adopting a pressure-feed pump for an irregular refractory. However, it is an object of the present invention to provide a casting construction method using an indeterminate refractory and an apparatus thereof that eliminate the occurrence of troubles associated with the curing of the kneaded material and allow the construction to be resumed promptly.
[0008]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention is a casting construction in which a casting material made of a refractory material kneaded by a kneading mixer is pumped to a construction site through a piping for feeding by a pumping pump, and the casting construction is performed.
A curing agent addition means, and a curing agent addition chamber provided around the outer periphery of a part of the pressure-feeding pipe immediately before pouring, a curing agent supply pipe connected to the curing agent addition chamber and supplying the curing agent; , A curing agent addition device composed of a plurality of curing agent addition holes formed in the peripheral surface of the pipe facing the curing agent addition chamber, and the curing agent addition hole of the curing agent addition device The sum of the opening areas is 3 to 15% of the cross-sectional area of the inner diameter of the piping for pressure feeding, and the hardener is removed from the refractory material during kneading by the kneading mixer and kneaded by the hardener adding means immediately before pouring. A casting method for forming an irregular refractory, characterized by adding a curing agent to the casting material, and a kneading mixer for kneading the refractory material, and a casting material kneaded by the kneading mixer and containing no curing agent. Pressure feed port Flop and a pumping pipe Send pouring material to the treated region poured from the feed pump, and androgynous a curing agent addition means provided in the pumping pipe of a position immediately before pouring, said curing agent addition means, poured just before A curing agent addition chamber attached to surround a part of the outer periphery of the pressure-feeding pipe at a position; a curing agent supply pipe that communicates with the curing agent addition chamber and supplies the curing agent; and faces the curing agent addition chamber The curing agent addition device is composed of a plurality of curing agent addition holes drilled in the peripheral surface of the pipe, and the sum of the opening areas of the curing agent addition holes of the curing agent addition device is used for the pumping. A casting construction apparatus for an irregular refractory, characterized in that it is 3 to 15% with respect to the cross-sectional area of the inner diameter of the pipe .
[0011]
As another curing agent addition means, a kneader that is provided immediately before pouring and that accepts the curing agent and adds and kneads the curing agent to the casting material that is pumped through the pipe may be used.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0013]
FIG. 1 shows an outline of an embodiment of the present invention. A kneading mixer 2 that receives a powder refractory material 1 and kneads it with water, and a kneaded material kneaded by the kneading mixer 2 (hereinafter referred to as a pouring material). A pumping pump 3 that receives and pumps it, a pumping pipe 4 (hose) connected to the discharge port of the pumping pump 3, and a nozzle 6 for pouring the pouring material toward the pouring construction target site 5 are provided. A curing agent addition means 7 is interposed at a position near the nozzle 6 of the pipe 4.
[0014]
As the kneading mixer 2, a batch-type kneading mixer or a continuous kneading mixer can be used. However, a continuous kneading mixer is preferably used for continuous pouring.
[0015]
A curing agent adder 8 is used as the curing agent addition means 7 in FIG.
[0016]
2 shows a side view of the adder portion in cross section, and FIG. 3 shows a cross-sectional view corresponding to AA in FIG. A short pipe 10 is formed between the pressure-

feeding pipes

4 and 4 separated from each other by

flanges

9 and 9 to form a part of the pressure-feeding pipe, and the outer periphery of the pipe 10 is surrounded in an annular shape. Thus, a curing agent addition chamber 11 is provided, and a curing agent supply pipe 12 for supplying the curing agent is connected to the curing agent addition chamber 11.
[0017]
A plurality of

hardener addition holes

13, 13... Are arranged at equal intervals in the circumferential direction on the peripheral surface of the pipe 10 facing the hardener addition chamber 11, and are supplied into the hardener addition chamber 11. Is added to the pouring material flowing in the pipe 10 through the addition holes 13.
[0018]
It is desirable to provide three or more curing

agent addition holes

13, 13... And the total opening area of the curing

agent addition holes

13, 13... Is in the range of 3 to 15% with respect to the cross-sectional area of the inner diameter of the pipe 10. It is preferable. If this ratio is less than 3% or 15% or more, it is difficult to uniformly add the curing agent to the casting material.
[0019]
The curing agent may be used in the form of powder or liquid, and may be supplied by pumping with a pump 14 or pumping with a combination of a pump and compressed air 15. However, when the curing agent is a powder, the use of compressed air is essential. When used in combination with compressed air, it is desirable that the pressure of the compressed air is ^{^{1kgf / cm 2 ~7kgf / cm 2}} . If this pressure is less than 1 kgf / cm ² , the effect of using compressed air cannot be obtained, and if it exceeds 7 kgf / cm ² , the feeding material is inhibited from being pumped and the casting material is scattered from the pipe or nozzle 6. , Casting construction becomes difficult.
[0020]
Next, the operation will be described.
[0021]
Powdered refractory material and water are put into the kneading mixer 2 and kneaded. The kneaded casting material is sent to the pressure feed pump 3 and from the pressure feed pump 3 through the pressure feed pipe 4 through the curing agent adder 8 and the nozzle 6. Pumped in the direction.
[0022]
A curing agent is pumped to the curing agent addition chamber 11 of the curing agent adder 8 through a curing agent supply pipe 12 by a pump 14 and compressed air 15, and the pouring that communicates through the pipe 10 of the curing agent adder 8 is performed. A hardening agent is added into the material through the hardening agent addition holes 13 of the pipe 10.
[0023]
Therefore, the curing agent is added to the casting material immediately before being discharged from the nozzle 6 to the casting construction site 5 and is poured into the construction site, the kneading mixer 2 and the pumping pump 3 break down, and the pumping of the casting material is interrupted. However, the pouring material remaining in the pressure feeding pipe 4 from the pressure feeding pump 3 to the curing agent adding device 8 does not contain the curing agent, so that the failure of the kneading mixer 2 and the pressure feeding pump 3 is corrected and the feeding material is pressure fed. The casting material in the pressure feed pump 3 and the pressure feed pipe 4 is not hardened until the operation is restarted.
[0024]
The addition of the curing agent to the casting material is performed through the plurality of curing agent addition holes 13, 13... Arranged in the circumferential direction of the pipe 10, so that the curing agent is uniformly distributed over the casting material. It is mixed.
[0025]
Specific dimension examples of the respective parts are shown in Table 1 in comparison with Comparative Examples 1 and 2.
[0026]
[Table 1]

The curing agent adder 8 in Table 1 was attached at a position 1.5 m behind from the tip of the nozzle 6, and the addition of the curing agent was constant.
[0027]
According to the present invention based on the above, according to the present invention, it is possible to perform pumping work using a pump of a casting material that does not contain a curing agent, and the casting material to which the curing agent is added immediately before the discharge of the casting material can be quickly cured after construction. I understand.
[0028]
FIG. 4 shows a modification of the present invention, in which a kneader 16 is used as the curing agent addition means 7. In the case of this kneader 16 as well, a continuous kneader is preferable for continuous casting.
[0029]
Also in this embodiment, the kneading machine 16 is provided in a position immediately adjacent to the nozzle 6, and after supplying the curing agent to the kneading machine 16 and kneading with the pouring material, the kneading machine 16 can be poured into the pouring site.
[0030]
【The invention's effect】
As explained above, according to the present invention, when the casting material is pumped by the pumping pump, the casting material in the pumping pump or the pumping pipe is completely cured even if the pumping construction is interrupted for some reason. Because there is no, construction can be resumed promptly. Further, if the pumping operation by the pumping pump is a steady operation, cleaning of the pumping pump and the piping for pumping and the remaining material processing become unnecessary, and the material in the pipe can be used as it is for the next construction. Furthermore, since the casting material is excluded from the curing agent, it can be kneaded with water at the time of manufacturing the casting material, and it is carried as it is to the construction site so that no kneading mixer is installed in the vicinity. It is also possible.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of an embodiment of the present invention.
2 is a side view, partly in section, showing an example of a curing agent addition means in FIG. 1. FIG.
3 is a cross-sectional view corresponding to AA in FIG. 2;
FIG. 4 is a side view showing an outline of another embodiment of the present invention.
[Explanation of symbols]
2 Kneading Mixer 3 Pressure Pump 4 Pressure Feeding Pipe 6 Nozzle 7 Curing Agent Adding Means 8 Curing Agent Adder 10 as Curing Agent Adding Means Pipe 11 Curing Agent Addition Chamber 12 Curing Agent Supply Pipe 13 Curing Agent Supply Hole 16 Kneading Machine

Claims

In the pouring construction in which the pouring material made of the refractory material kneaded by the kneading mixer is pumped to the construction site through the piping for pumping by the pumping pump,
A curing agent addition means is provided around the outer periphery of a part of the pressure-feeding pipe immediately before pouring, a curing agent addition chamber connected to the curing agent addition chamber, and a curing agent supply pipe for supplying the curing agent. , A curing agent addition device composed of a plurality of curing agent addition holes drilled on the peripheral surface of the pipe facing the curing agent addition chamber, and the curing agent addition hole of the curing agent addition device The sum total of the opening areas is 3 to 15% with respect to the cross-sectional area of the inner diameter of the pumping pipe,
A casting method for an amorphous refractory, characterized in that the curing agent is removed from the refractory material during kneading by the kneading mixer, and the curing agent is added to the cast material that has been kneaded by the curing agent addition means immediately before casting.

A kneading mixer for kneading the refractory material, a pressure feeding pump for pumping a pouring material kneaded by the kneading mixer and not containing a curing agent, a pressure feeding pipe for feeding the pouring material from the pressure feeding pump to the pouring construction site, and a position immediately before pouring A hardener addition means provided in the piping for pressure feeding ,
A curing agent addition chamber provided around the outer periphery of a part of the pressure-feeding pipe immediately before pouring, and a curing agent supply pipe connected to the curing agent addition chamber and supplying the curing agent. And a curing agent adder composed of a plurality of curing agent addition holes drilled in the peripheral surface of the pipe facing the curing agent addition chamber,
Casting construction of amorphous refractory, characterized in that the sum of the opening areas of the curing agent addition holes of the curing agent addition device is 3 to 15% with respect to the cross-sectional area of the inner diameter of the pumping pipe apparatus.

The casting construction apparatus for an amorphous refractory according to claim 2, wherein the curing agent is supplied to the curing agent addition chamber of the curing agent adder together with the compressed air.