JPH0659434B2 - Concrete spraying device - Google Patents
Concrete spraying deviceInfo
- Publication number
- JPH0659434B2 JPH0659434B2 JP60190333A JP19033385A JPH0659434B2 JP H0659434 B2 JPH0659434 B2 JP H0659434B2 JP 60190333 A JP60190333 A JP 60190333A JP 19033385 A JP19033385 A JP 19033385A JP H0659434 B2 JPH0659434 B2 JP H0659434B2
- Authority
- JP
- Japan
- Prior art keywords
- compressed air
- concrete
- air passage
- spraying device
- injection port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Lining And Supports For Tunnels (AREA)
- Nozzles (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、トンネルや建物内等の閉鎖空間内でコンク
リートを吹付けるための、乾式工法及びセミ湿式工法を
対象としたコンクリート吹付け装置に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a concrete spraying device for spraying concrete in a closed space such as a tunnel or a building, which is intended for a dry method and a semi-wet method. It is a thing.
（従来の技術） 一般に、乾式工法は、セメント、砂、砂利等のコンクリ
ート原料を混合した状態で施工場所まで圧送し、吹付け
直前で水や急結剤を注入、混練して吹付けるものであ
り、また、セミ湿式工法は、コンクリート原料に予め少
量（必要量の一部）の水を加えて混練した状態で施工場
所まで圧送し、吹付け直前で残りの水や急結剤を注入、
混練して吹付けるものであり、両工法とも、全必要量の
水を予めコンクリート原料に加えて混練した状態で圧送
する湿式工法に比べて種々の利点があることから、広く
採用されている。(Prior art) Generally, the dry method is a method in which concrete raw materials such as cement, sand, and gravel are mixed and pressure-fed to the construction site, and water and a quick-setting agent are injected and kneaded and sprayed immediately before spraying. Yes, in the semi-wet method, a small amount (a part of the required amount) of water is added to the concrete raw material in advance and pressure is sent to the construction site, and the remaining water and quick-setting agent are injected immediately before spraying.
These methods are kneading and spraying, and both methods are widely adopted because they have various advantages as compared with a wet method in which all necessary amount of water is added to a concrete raw material in advance and pressure is fed in a kneaded state.
（発明が解決しようとする課題） しかし、上記する乾式工法およびセミ湿式工法の場合
は、セメント原料の一部が未混練の状態で吹付けられる
ため、吹付け時の粉塵の発生が著しいという問題があ
る。(Problems to be Solved by the Invention) However, in the case of the dry method and the semi-wet method described above, since a part of the cement raw material is sprayed in an unkneaded state, the generation of dust during spraying is significant. There is.
両工法において用いる従来の一般的なコンクリート吹付
け装置は、第６図に示すように、コンクリート原料の圧
送ホース21の先端に接続金具23を介してノズル管22を接
続してなり、該ノズル管22はその基部より噴射口（先端
開口）に向けて漸次内径を縮小した構成になつている。As shown in FIG. 6, a conventional general concrete spraying device used in both construction methods comprises a nozzle pipe 22 connected to the tip of a concrete feed hose 21 via a connecting fitting 23. 22 has a structure in which the inner diameter is gradually reduced from its base toward the injection port (tip opening).
上記するようなノズル管22を使用してクリート吹付けを
行う場合、コンクリートはノズル管22内において圧力お
よび速度が変化し、噴射口に至る間に中心部に集中しよ
うとする絞り込み傾向を示しながら高速噴射されるた
め、吹付け時に粉塵の発生が著しく、また、コンクリー
トの跳ね返り率（壁面に吸着せず落下する割合）も比較
的高くて効率の悪いものである。When cleat spraying is performed using the nozzle tube 22 as described above, the concrete changes in pressure and speed in the nozzle tube 22, and shows a tendency to concentrate in the central portion while reaching the injection port. Since it is injected at high speed, dust is remarkably generated at the time of spraying, and the bounce rate of concrete (the rate of falling without adsorbing on the wall surface) is relatively high and inefficient.
この発明は上述の点に鑑みなされたもので、粉塵の発生
が少なく、コンクリートの跳ね返り率も低くて効率が良
く、しかも構造簡単なコンクリート吹付け装置を提供す
ることを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a concrete spraying device that has a small amount of dust generation, a low concrete rebound rate, high efficiency, and a simple structure.
（課題を解決するための手段） 上記目的を達成するためのこの発明の要旨とするところ
は、コンクリート吹付け用のノズル管先端に、所定の長
さで噴射口径と同一径をなすノズル管先部を形成し、該
ノズル管先部に対し二重管構成にして圧縮空気通路を形
成し、該圧縮空気通路の噴射口側端を噴射口後方に開口
させるとともに、圧縮空気通路に連通して圧縮空気導入
口を設け、圧縮空気通路からの圧縮空気をノズル管先部
周壁に沿わせ流動噴射させることを特徴とするコンクリ
ート吹付け装置にある。(Means for Solving the Problem) The gist of the present invention for achieving the above-mentioned object is to provide a nozzle pipe tip having a predetermined length and the same diameter as the injection port diameter at the nozzle pipe tip for concrete spraying. A portion of the compressed air passage is formed in a double pipe structure with respect to the nozzle pipe tip portion to open the injection port side end of the compressed air passage to the rear of the injection port and to communicate with the compressed air passage. The concrete spraying device is characterized in that a compressed air introduction port is provided and the compressed air from the compressed air passage is flow-injected along the peripheral wall of the nozzle pipe tip.
（作用） この発明のコンクリート吹付け装置によれば、コンクリ
ートは噴射される直前にノズル管先部内を通過する間に
圧力および速度がほぼ一定になり、その形態を崩すこと
なく噴射口から噴射される。圧縮空気通路内に導入され
た圧縮空気はノズル管先部周壁に沿い噴射口向けに流動
噴射されて噴射コンクリートを取り巻き状にエアカーテ
ンを形成する。(Operation) According to the concrete spraying device of the present invention, the concrete has a substantially constant pressure and velocity while passing through the inside of the nozzle pipe tip immediately before being jetted, and is jetted from the jet port without breaking its form. It The compressed air introduced into the compressed air passage is flow-injected toward the injection port along the peripheral wall of the nozzle tube tip portion to form an air curtain around the injected concrete.
こうして噴射コンクリートはエアーカーテンで包囲した
状態で目的の壁面に吹付けられるので粉塵の発生が少な
くなり、コンクリートの跳ね返りも減少する。In this way, the sprayed concrete is sprayed onto the target wall surface while being surrounded by the air curtain, so that the generation of dust is reduced and the rebound of concrete is also reduced.
（実施例） 以下、この発明の実施例を図面に基づいて説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明の吹付け装置の斜視図、第２図は同断
面図である。FIG. 1 is a perspective view of a spraying device of the present invention, and FIG. 2 is a sectional view of the same.
図において、１はコンクリート原料の圧送ホース、２は
コンクリート吹付け用のノズル管で、このノズル管２は
圧送ホース１の先端に接続金具３を介して取着される。In the drawing, reference numeral 1 is a pressure feed hose for concrete raw material, 2 is a nozzle pipe for spraying concrete, and this nozzle pipe 2 is attached to the tip of the pressure feed hose 1 via a connecting fitting 3.
４はこの発明に係る吹付け装置を示す この吹付け装置４は、ノズル管２の先端に、所定の長さ
で噴射口径と同一径をなすノズル管先部4aを形成し、こ
のノズル管先部4aの基部に径大部を設けてノズル管２と
の間で二重管構成にして圧縮空気通路4bを形成し、この
圧縮空気通路4bの噴射口側端を噴射口後方に開口4cさせ
るとともに、圧縮空気通路4bに連通して圧縮空気導入口
５を設けている。Reference numeral 4 denotes a spraying device according to the present invention. This spraying device 4 has a nozzle pipe tip 4a having a predetermined length and the same diameter as the injection port diameter formed at the tip of the nozzle pipe 2. A large-diameter portion is provided at the base of the portion 4a to form a compressed air passage 4b with the nozzle tube 2 to form a compressed air passage 4b, and an end of the compressed air passage 4b on the injection port side is opened 4c behind the injection port. At the same time, a compressed air introduction port 5 is provided in communication with the compressed air passage 4b.
圧縮空気空路4bの開口4cは、径大部内において径大部内
面とノズル管先部4aの内面をテーパ面で連続させ、ま
た、このテーパ面に対応してノズル管２の端部周壁をテ
ーパー面に形成してノズル管先部4aの内面に向けて緩く
傾斜させたテーパ状に開口させている。In the opening 4c of the compressed air air passage 4b, the inner surface of the large-diameter portion and the inner surface of the nozzle pipe tip 4a are continuous with each other by a tapered surface in the large-diameter portion, and the end peripheral wall of the nozzle tube 2 is tapered corresponding to the tapered surface. It is formed on the surface and is opened in a tapered shape that is gently inclined toward the inner surface of the nozzle tube tip portion 4a.
なお、メインテナンスや部品の交換が可能なように、例
えば、第３図に示すようにノズル管２に対してノズル管
先部4aの径大部端部をネジ結合4dして着脱自在にしても
よい。この場合、ネジ結合4d部にはシール部材4eを介装
して空気漏れを防止する。In order to allow maintenance and replacement of parts, for example, as shown in FIG. 3, the large diameter end of the nozzle tube tip 4a can be detachably attached to the nozzle tube 2 by screw connection 4d. Good. In this case, a seal member 4e is interposed in the screw coupling 4d portion to prevent air leakage.
上記構成において、圧送ホース１からのコンクリート原
料は通常2.0〜2.5kg/cm2の空気圧で圧送される。同時
に、圧縮空気導入口５に接続した圧縮空気供給用ホース
６からの圧縮空気はコンクリート圧送圧力より高い通常
3.0〜4.0kg/cm2の圧力で送給される。In the above structure, the concrete raw material from the pressure-feeding hose 1 is normally pressure-fed at an air pressure of 2.0 to 2.5 kg / cm 2 . At the same time, the compressed air from the compressed air supply hose 6 connected to the compressed air introduction port 5 is usually higher than the concrete pumping pressure.
Delivered at a pressure of 3.0-4.0 kg / cm 2 .
ここで、コンクリート原料は噴射される直前にノズル管
先部4a内を通過する間に圧力および速度がほぼ一定にな
り、その形態を崩すことなく噴射口から噴射される。圧
縮空気通路4b内に送給された圧縮空気は、ノズル管先部
4aの内面に向けて緩く傾斜したテーパ状の開口4cからノ
ズル管先部4a内面に沿いコンクリート原料との間に割り
込むように流動して噴射され、噴射後の噴射コンクリー
トを取り巻き状にエアーカーテンを形成する。Here, the pressure and velocity of the concrete raw material become substantially constant while passing through the nozzle tube tip portion 4a immediately before being injected, and the concrete raw material is injected from the injection port without breaking its shape. The compressed air sent into the compressed air passage 4b is the nozzle tube tip.
The taper-shaped opening 4c gently inclined toward the inner surface of 4a flows along the inner surface of the nozzle pipe tip 4a so as to intervene between it and the concrete raw material, and is injected, and the air curtain is wrapped around the injected concrete after injection. Form.
こうして噴射コンクリートはエアカーテンで包囲した状
態で目的の壁面に吹付けられるので、粉塵の発生が抑え
られると共に、跳ね返り量が少なくて壁面に対するコン
クリートの付着率を高くするものである。In this way, the sprayed concrete is sprayed on the target wall surface while being surrounded by the air curtain, so that the generation of dust is suppressed and the amount of rebound is small, so that the adhesion rate of the concrete to the wall surface is increased.
なお、第４図は本発明のコンクリート吹付け装置を用い
た乾式工法の作業工程図で、同図において、ｘはコンク
リート原料としてのセメント、ｙは砂、ｚは砂利で、Ａ
は各コンクリート原料の計測工程、Ｂは同混合工程を示
す。また、11は吹付け機本体、12は混合バルブ、13,14
は開閉バルブである。更に、ａは圧縮空気、ｂは圧力
水、ｃは液体急結剤を示す。In addition, FIG. 4 is a working process diagram of a dry method using the concrete spraying device of the present invention, in which x is cement as a concrete raw material, y is sand, z is gravel, and A
Shows the measuring process of each concrete raw material, and B shows the same mixing process. In addition, 11 is a spraying machine main body, 12 is a mixing valve, 13 and 14
Is an open / close valve. Further, a is compressed air, b is pressurized water, and c is a liquid quick-setting agent.
次に、この発明に係る上記実施例の吹付け装置と従来の
吹付け装置（第６図参照）との比較表を下記に示す。Next, a comparison table of the spraying device of the above-described embodiment according to the present invention and the conventional spraying device (see FIG. 6) is shown below.
ところで、エアカーテン形成用の圧縮空気の圧力をコン
クリート原料の圧送圧力よりも低くした場合にも、当
初、ある程度前記効果に近い効果を奏するが、前記圧縮
空気通路4bの開口4c部に徐々にコンクリート原料が付着
して溜まり、圧縮空気の供給が阻害されると共に、コン
クリート原料が圧縮空気通路4b側へ逆流する虞れがある
ため、圧縮空気の圧力をコンクリートの圧送圧力より高
く設定する必要がある。 By the way, even when the pressure of the compressed air for forming the air curtain is made lower than the pumping pressure of the concrete raw material, initially, an effect close to the above effect is obtained to some extent, but the opening 4c of the compressed air passage 4b is gradually reinforced with concrete. Since the raw material adheres and accumulates, the supply of compressed air is hindered, and the concrete raw material may flow backward to the compressed air passage 4b side, it is necessary to set the pressure of the compressed air higher than the pressure of the concrete. .
次に、第５図はこの発明の他の実施例を示す。Next, FIG. 5 shows another embodiment of the present invention.
この実施例における吹付け装置４は、ノズル管２自体を
全長に亘り噴射口径と同一径をなす場合のもので、ノズ
ル管２の先端部外周に同心状に筒状体４′を装着（二重
管構成）にしてこの筒状体４′とノズル管２との間に圧
縮空気通路4bを形成し、その前端を噴射口後方で開口4c
させている。The spraying device 4 in this embodiment is one in which the nozzle tube 2 itself has the same diameter as the injection port diameter over the entire length, and a cylindrical body 4'is concentrically attached to the outer periphery of the tip end portion of the nozzle tube 2 (two A compressed air passage 4b is formed between the tubular body 4'and the nozzle tube 2 in the form of a heavy pipe, and the front end of the compressed air passage 4b is opened behind the injection port 4c.
I am letting you.
この場合の圧縮空気通路4bからの圧縮空気はノズル管２
の外周壁に沿つて流動して噴射される。なお、コンクリ
ート原料の吹付け態様は、前記実施例と略同様であるの
で説明を省略する。The compressed air from the compressed air passage 4b in this case is the nozzle tube 2
Is sprayed by flowing along the outer peripheral wall of the. Note that the manner of spraying the concrete raw material is substantially the same as that in the above-mentioned embodiment, and therefore its explanation is omitted.
（効果） 以上説明した上記した構成からなるこの発明のコンクリ
ート吹付け装置によれば、下記の如き効果を奏する。(Effects) According to the concrete spraying device of the present invention having the above-described configuration, the following effects are exhibited.
(1)コンクリート原料は噴射される直前でノズル管先部
内を通過する間に圧力および速度をほぼ一定にして噴射
されるので、噴射後の噴射コンクリートの形態が保たれ
る一方、エアカーテンを形成する圧縮空気はノズル管先
部周壁に沿いコンクリート原料に平行流動して噴射され
るので、噴射コンクリートが圧縮空気（エアカーテン）
により形崩れを起こすこともない。(1) Since the concrete raw material is injected just before being injected with the pressure and speed kept almost constant while passing through the tip of the nozzle tube, the shape of the injected concrete after injection is maintained, while forming an air curtain. The compressed air that flows is injected parallel to the concrete raw material along the peripheral wall of the nozzle pipe tip, so the injected concrete is compressed air (air curtain).
It doesn't lose its shape.
(2)コンクリート原料が吹付けられる際、噴射コンクリ
ートはエアカーテンにより確り包囲された状態で目的の
壁面に確実に吹付けられるので、従来の吹付け装置に比
べて粉塵の発生量が著しく少なく、また、跳ね返り率も
低く、コンクリート原料が少なくて済み経済的であり、
また、作業環境が改善され、作業性が向上し、特に、ト
ンネル等の閉鎖空間内における吹付け作業に好適する。(2) When the concrete raw material is sprayed, the sprayed concrete is reliably sprayed on the target wall surface while being reliably surrounded by the air curtain, so the amount of dust generated is significantly smaller than in conventional spraying equipment, In addition, it has a low bounce rate, requires less concrete raw material, and is economical,
Further, the work environment is improved and the workability is improved, and it is particularly suitable for spraying work in a closed space such as a tunnel.
第１図はこの発明の吹付け装置の実施例を示す斜視図、
第２図は同断面図、第３図は第２図の一部拡大断面図、
第４図は本発明のコンクリート吹付け装置を用いた乾式
工法の作業工程図、第５図は他の実施例を示す断面図、
第６図は従来の吹付け装置を示す断面図である。 １……圧送ホース、２……ノズル管、４……吹付け装
置、4a……ノズル管先部、4b……圧縮空気通路、５……
圧縮空気導入口。FIG. 1 is a perspective view showing an embodiment of a spraying device of the present invention,
2 is the same sectional view, FIG. 3 is a partially enlarged sectional view of FIG. 2,
FIG. 4 is a working process diagram of a dry method using the concrete spraying device of the present invention, and FIG. 5 is a sectional view showing another embodiment.
FIG. 6 is a sectional view showing a conventional spraying device. 1 ... Pressure feeding hose, 2 ... Nozzle tube, 4 ... Spraying device, 4a ... Nozzle tube tip, 4b ... Compressed air passage, 5 ...
Compressed air inlet.
Claims (1)
に、所定の長さで噴射口径と同一径をなすノズル管先部
を形成し、該ノズル管先部に対し二重管構成にして圧縮
空気通路を形成し、該圧縮空気通路の噴射口側端を噴射
口後方に開口させるとともに、圧縮空気通路に連通して
圧縮空気導入口を設け、圧縮空気通路からの圧縮空気を
ノズル管先部周壁に沿わせ流動噴射させることを特徴と
するコンクリート吹付け装置。1. A nozzle pipe tip for spraying concrete is provided with a nozzle pipe tip portion having a predetermined length and the same diameter as an injection port diameter, and a double pipe structure is compressed with respect to the nozzle pipe tip portion. An air passage is formed, an end on the injection port side of the compressed air passage is opened rearward of the injection port, a compressed air introduction port is provided in communication with the compressed air passage, and compressed air from the compressed air passage is connected to the nozzle pipe tip. A concrete spraying device characterized by a flow injection along a peripheral wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60190333A JPH0659434B2 (en) | 1985-08-28 | 1985-08-28 | Concrete spraying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60190333A JPH0659434B2 (en) | 1985-08-28 | 1985-08-28 | Concrete spraying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6249964A JPS6249964A (en) | 1987-03-04 |
| JPH0659434B2 true JPH0659434B2 (en) | 1994-08-10 |
Family
ID=16256445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60190333A Expired - Fee Related JPH0659434B2 (en) | 1985-08-28 | 1985-08-28 | Concrete spraying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0659434B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3583107B2 (en) * | 2001-03-05 | 2004-10-27 | 電気化学工業株式会社 | Continuous production equipment for quick setting slurry and spraying method using the same |
| US6915966B2 (en) * | 2003-01-29 | 2005-07-12 | Specialty Minerals (Michigan) Inc. | Apparatus for the gunning of a refractory material and nozzles for same |
| US7854397B2 (en) | 2005-01-21 | 2010-12-21 | Specialty Minerals (Michigan) Inc. | Long throw shotcrete nozzle |
| JP5316863B2 (en) * | 2009-02-10 | 2013-10-16 | 三和産業株式会社 | Spray nozzle device in spray machine |
| CN103233750A (en) * | 2013-04-26 | 2013-08-07 | 胡方志 | Injection mechanism for tidal concrete sprayer |
| CN110000023B (en) * | 2019-05-07 | 2024-05-10 | 中建八局轨道交通建设有限公司 | Device for reducing spraying dust |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439853A (en) * | 1981-08-12 | 1984-03-27 | Rca Corporation | Capacitive playback stylus |
-
1985
- 1985-08-28 JP JP60190333A patent/JPH0659434B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6249964A (en) | 1987-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3478963A (en) | Dispensing gun for fiber rovings and cementitious materials | |
| US3740260A (en) | Dispensing gun for fiber rovings and cementitious materials | |
| US4583329A (en) | High pressure jets | |
| JPH0659434B2 (en) | Concrete spraying device | |
| ATE49264T1 (en) | DEVICE FOR PNEUMATIC APPLICATION OF A HYDROMECHANICALLY DENSE FLOW, HARDING BUILDING MATERIAL, IN PARTICULAR HYDRAULIC SPRAY CONCRETE OR MORTAR. | |
| KR100989428B1 (en) | The structure repair method of construction for which mortar, this injection equipment and this were used | |
| CA1260715A (en) | Feeding abrasive material | |
| JPS6223478A (en) | Construction method for spraying concrete | |
| FR2751562A3 (en) | Wet sprayer for pneumatically-conveyed concrete or mortar e.g. for tunnel lining double-conical bluff body with shape developed to prevent growth of deposits, held by supports which avoid wear leading to separation | |
| CN211613115U (en) | Discharging device of concrete wet blasting machine | |
| JPH0543866Y2 (en) | ||
| JPH06167108A (en) | Spraying process of cement mortar | |
| CN210032642U (en) | Even material system that divides of dual spray wet blasting machine | |
| JP3588032B2 (en) | Spraying method of mixture and its equipment | |
| JP3123777B2 (en) | Mixing tube for spraying method | |
| JP2001288751A (en) | Shotcrete machine | |
| JP4137578B2 (en) | Mortar or concrete mixing equipment and mortar or concrete spraying equipment | |
| JPH11197556A (en) | Spraying system for mortar coating | |
| JP2001123795A (en) | Quick-setting admixture supply device and shotcrete device using it | |
| JPS605966A (en) | Addition of liquid mixing agent in spray concrete | |
| JP3513466B2 (en) | Spraying method of mixture and its equipment | |
| JP2564434B2 (en) | Mixing equipment for dry concrete spraying equipment | |
| JPH10246097A (en) | Spraying method of spraying material, and spray device for spraying material | |
| JPH0340373Y2 (en) | ||
| GB2122909A (en) | Injection of partially dry-mixed consolidating or filling materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |