JPH0359224B2 - - Google Patents
Info
- Publication number
- JPH0359224B2 JPH0359224B2 JP60025996A JP2599685A JPH0359224B2 JP H0359224 B2 JPH0359224 B2 JP H0359224B2 JP 60025996 A JP60025996 A JP 60025996A JP 2599685 A JP2599685 A JP 2599685A JP H0359224 B2 JPH0359224 B2 JP H0359224B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- tip
- air
- nozzle
- constriction
- 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 - Lifetime
Links
Landscapes
- Lining And Supports For Tunnels (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、たとえばいわゆるNATM工法等の
コンクリート類吹付工法に用いられる吹付装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spraying device used in a concrete spraying method such as the so-called NATM method.
従来、この種の工法に用いられている吹付ノズ
ルは、単純に流路面積が一定な管であつた。すな
わち、第７図のように、ホース先端に塩化ビニル
管等からなるストレートパイプノズル１′を設け
たものである。
Conventionally, the spray nozzle used in this type of construction method was simply a pipe with a constant flow path area. That is, as shown in FIG. 7, a straight pipe nozzle 1' made of a vinyl chloride pipe or the like is provided at the end of the hose.
しかし、コンクリートは骨材等の粗粒分Ｌとセ
メント等の細粒分Ｓとを含むため、それらの重力
差によつて細粒分Ｓはノズル１の管壁に沿つて流
れ、粗粒分Ｌはノズル１の中心部を走つて吹付け
られるようになる。したがつて、材料が分離した
状態で吹付けられる。その結果、対象面Ｘに対す
る材料の付着性が悪く、このため粉塵量および跳
ね返り量がきわめて多く、しかも品質のバラツキ
が大きい。さらに、作業員の安全性の点でも難が
ある。
However, since concrete contains coarse particles L such as aggregate and fine particles S such as cement, the fine particles S flow along the pipe wall of nozzle 1 due to the difference in gravity between them, and the coarse particles L runs through the center of the nozzle 1 and can be sprayed. Therefore, the material is sprayed in a separated state. As a result, the adhesion of the material to the target surface X is poor, resulting in extremely large amounts of dust and rebound, and furthermore, the quality varies widely. Furthermore, there are also problems in terms of worker safety.
そこで本発明の主たる目的は、材料の分離が無
く、均一かつ高い付着性を示す吹付装置を提供す
ることにある。 Therefore, the main object of the present invention is to provide a spraying device that exhibits uniform and high adhesion without material separation.
上記問題点を解決するための本発明は、コンク
リート類供給路の先端部に設けられた吹付ノズル
管の先端より基端側位置において、吐出側に向か
つて流路面積を小さくするテーパ絞り部を形成
し、そのテーパ絞り部終端部分以降は段部をもつ
て先端まで内径を拡大させ、その段部の半径方向
の壁に実質的にコンクリート類流れの前方に向い
たエア吹出口を開口させたことを特徴とするもの
である。
In order to solve the above problems, the present invention includes a taper constriction portion that reduces the flow path area toward the discharge side at a position on the proximal side from the tip of the spray nozzle pipe provided at the tip of the concrete supply path. After the end of the tapered constriction part, the inner diameter is expanded to the tip with a step, and an air outlet is opened in the radial wall of the step, substantially facing the front of the flow of concrete. It is characterized by this.
本発明では、吹付ノズル内に絞り部が形成され
る。したがつて、コンクリート類（本発明では、
コンクリートのほか、モルタル、あるいはそれら
にスチールフアイバー等の添加材を添加したもの
などを含む）は、絞り部において収束されながら
加速される。この収束・加速によつて、コンクリ
ート中の粗粒分と細粒分とが一気に混合された状
態で絞り部を抜ける。しかも、絞り部の出側には
エア吹出口が形成され、ここからエアがノズル先
端へ、または絞り部のテーパーに沿う形式などに
よつてコンクリート流れの前方に向つて吹出され
るから、コンクリートが絞り部を抜けるときの粗
粒分と細粒分との混合を助長し、かつコンクリー
トの流速を加速させる。さらに、絞り部出側から
ノズル先端にエア吹出口を向けた場合、そのエア
吹出口から吹出されたエアーは、ノズルの管内壁
に沿つて流れ、先端から噴出されるので、その先
端から対象面にわたつて、コンクリート材料を包
囲するエアーカーテンを形成するので、粉塵の飛
散が防止され、かつ跳ね返りが無い。跳ね返りに
ついては、材料が均一に混合された状態で吹付け
られる点からも、その量が少くなる。また、材料
が均一に吹付けられる点からして、近年行われて
いるところの強度向上のために補強用スケールフ
アイバーの混入を、その機能を損うことなく確実
に行うことができる。
In the present invention, a constriction portion is formed within the spray nozzle. Therefore, concrete (in the present invention,
In addition to concrete, mortar (including mortar or materials to which additives such as steel fibers are added) are converged and accelerated at the constriction section. Due to this convergence and acceleration, the coarse particles and fine particles in the concrete are mixed all at once and pass through the constriction section. Moreover, an air outlet is formed on the outlet side of the constriction part, and air is blown out from here to the tip of the nozzle or toward the front of the concrete flow by following the taper of the constriction part, so that the concrete can be It promotes mixing of coarse particles and fine particles when passing through the constriction part, and accelerates the flow rate of concrete. Furthermore, when the air outlet is directed from the outlet side of the constriction section to the tip of the nozzle, the air blown out from the air outlet flows along the inner wall of the nozzle tube and is ejected from the tip. Since an air curtain is formed that surrounds the concrete material over a period of time, dust is prevented from scattering and there is no rebound. The amount of rebound is also reduced because the materials are sprayed in a uniformly mixed state. Furthermore, since the material can be sprayed uniformly, it is possible to reliably incorporate reinforcing scale fibers to improve strength, which has been done in recent years, without impairing its function.
以下本発明を図面に示す具体例によつてさらに
詳説する。
The present invention will be explained in more detail below with reference to specific examples shown in the drawings.
まず、第５図によつて、全体の装置構成につい
て説明すると、コンクリート材料Ｍは圧送機１０
内に投入され、コンプレツサー１２等の空気圧を
受けて、ホース１４を介して圧送され、必要によ
りその途中で急結剤１６等が添加され、吹付ノズ
ル１から対象面Ｘへ吹付けられる。 First, referring to FIG. 5, the overall device configuration will be explained.
It is fed through a hose 14 under air pressure from a compressor 12, etc., and if necessary, a quick-setting agent 16 or the like is added along the way, and then sprayed from a spray nozzle 1 onto the target surface X.
さて本発明の吹付ノズル１は第１図および第２
図に示す構造とされている。すなわち、ノズル１
の先端からたとえば３〜６ｍ程度基端側位置にお
いて、流路面積を小さくする先端側細りのテーパ
状の絞り部２が形成され、かつその先端から短い
平行部３を形成するとともに、平行部３先端とノ
ズル１の内壁との段部に、先端へ向いたエア吹出
口４，４…が多数形成されている。５はコンプレ
ツサー１２に接続されたエア送気管で、その途中
には空気調整弁６が設けられ、環状のエアヘツダ
７に連つている。このエアヘツダ７からエアは、
分流路８，８…を介して各エア吹出口４，４…へ
導かれる。 Now, the spray nozzle 1 of the present invention is shown in FIGS.
The structure is shown in the figure. That is, nozzle 1
For example, at a proximal position of about 3 to 6 m from the distal end, a narrow tapered constriction part 2 is formed on the distal end side to reduce the flow path area, and a short parallel part 3 is formed from the distal end. A large number of air outlets 4, 4, . . . facing toward the tip are formed at the stepped portion between the tip and the inner wall of the nozzle 1. Reference numeral 5 denotes an air supply pipe connected to the compressor 12, an air regulating valve 6 is provided in the middle thereof, and the pipe is connected to an annular air header 7. The air from this air header 7 is
The air is guided to each air outlet 4, 4, . . . via branch channels 8, 8, .
エア吹出口４の数は限定されないが、エアーカ
ーテンを形成する点を強調することからすれば、
周方向に３個所、より好ましくは６カ所以上が好
適である。また、エア吹出口としては、第３図の
ように、環状の吹出口４′としておくと、エアー
カーテンの効果が一層高まる。 The number of air outlets 4 is not limited, but from the viewpoint of emphasizing the formation of an air curtain,
Three locations, more preferably six or more locations in the circumferential direction are suitable. Furthermore, if the air outlet is an annular outlet 4' as shown in FIG. 3, the effect of the air curtain will be further enhanced.
一般にノズル１の外径は65mmφとされるが、コ
ンクリートの圧送量を４〜６m3／hrとすれば、加
速用エアの圧力は４〜７、通常５〜６Kg／cm2程度
でよい。 Generally, the outer diameter of the nozzle 1 is 65 mmφ, but if the concrete pumping rate is 4 to 6 m 3 /hr, the pressure of the accelerating air may be 4 to 7, usually about 5 to 6 kg/cm 2 .
もし、コンクリートにスチールフアイバーを混
入する場合、圧送機１０で混合すればよい。 If steel fibers are to be mixed into concrete, they may be mixed using a pressure feeder 10.
かくして、本発明に係る吹付ノズルによると、
第４図のように、絞り部２まで分離していた粗粒
分Ｌと細粒分Ｓとは、絞り部２において収束され
かつエアＡの吹出しも手伝つて加速されるので、
均一に混合されるようになり、均一状態でかつ高
速で対象面Ｘへ吹付けられる。このとき、吹出し
エアＡはノズル１先端から対象面Ｘへわたつてエ
アーカーテンを形成する。 Thus, according to the spray nozzle according to the present invention,
As shown in FIG. 4, the coarse particles L and fine particles S, which had been separated up to the constriction section 2, are converged at the constriction section 2 and accelerated with the help of the air A.
The mixture is uniformly mixed and sprayed onto the target surface X in a uniform state and at high speed. At this time, the blown air A spreads from the tip of the nozzle 1 to the target surface X to form an air curtain.
以上の通り、本発明によれば、絞り部を形成す
るとともに、その絞り部分にエア吹出口を形成し
たので、次記のような効果を奏する。
As described above, according to the present invention, since the constricted portion is formed and the air outlet is formed in the constricted portion, the following effects can be achieved.
(1) 材料分離が無いため吹付面が平滑かつ均一な
厚みとなる。また品質が安定かつ高まる。(1) Since there is no material separation, the sprayed surface is smooth and has a uniform thickness. Also, the quality is stable and improved.
(2) 跳ね返りが少く、経済的である。(2) Less bounce and economical.
(3) 粉塵が減少し、作業環境が改善され、大量の
吹付が可能となる。(3) Dust is reduced, the working environment is improved, and a large amount of spraying becomes possible.
(4) 特に絞り部の出側にノズル壁に沿うようエア
吹出口を形成すると、エアーカーテンの形成に
伴つて、危険な跳ね返りが少く、安全性が高ま
る。(4) In particular, if the air outlet is formed along the nozzle wall on the outlet side of the constriction part, there will be less dangerous rebound due to the formation of an air curtain, increasing safety.
(5) 均一な吹付が可能であるため、たとえ補強用
フアイバーを混入する場合であつても、その効
果が十分発揮したものとなる。(5) Since uniform spraying is possible, even if reinforcing fibers are mixed in, the effect will be fully demonstrated.
第１図は本発明装置のノズル部分の縦断面図、
第２図はその−線矢視図、第３図は他の例の
横断面図、第４図は材料の流れ状態を示す縦断面
図、第５図は吹付装置全体の概要図、第６図は従
来ノズルによる材料の流れ状態を示す縦断面図で
ある。
１……吹出ノズル、２，２Ａ……絞り部、４，
４Ａ……エア吹出口、５……エア送気管。
FIG. 1 is a longitudinal sectional view of the nozzle part of the device of the present invention;
Fig. 2 is a view taken along the - line, Fig. 3 is a cross-sectional view of another example, Fig. 4 is a longitudinal sectional view showing the flow state of the material, Fig. 5 is a schematic diagram of the entire spraying device, and Fig. 6 is a cross-sectional view of another example. The figure is a longitudinal sectional view showing the state of material flow through a conventional nozzle. 1...Blowout nozzle, 2, 2A...Aperture part, 4,
4A...Air outlet, 5...Air supply pipe.
Claims (1)
吹付ノズル管の先端より基端側位置において、吐
出側に向かつて流路面積を小さくするテーパ絞り
部を形成し、そのテーパ絞り部終端部分以降は段
部をもつて先端まで内径を拡大させ、その段部の
半径方向の壁に実質的にコンクリート類流れの前
方に向いたエア吹出口を開口させたことを特徴と
するコンクリート類の吹付装置。1. At a position on the proximal side from the tip of the spray nozzle pipe provided at the tip of the concrete supply channel, a tapered constriction part is formed that reduces the flow path area toward the discharge side, and after the end of the taper constriction part, A spraying device for concrete, characterized in that it has a stepped part whose inner diameter is enlarged to the tip, and an air outlet facing substantially forward of the flow of concrete is opened in the radial wall of the stepped part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025996A JPS61186668A (en) | 1985-02-12 | 1985-02-12 | Apparatus for spraying concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025996A JPS61186668A (en) | 1985-02-12 | 1985-02-12 | Apparatus for spraying concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186668A JPS61186668A (en) | 1986-08-20 |
| JPH0359224B2 true JPH0359224B2 (en) | 1991-09-09 |
Family
ID=12181327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60025996A Granted JPS61186668A (en) | 1985-02-12 | 1985-02-12 | Apparatus for spraying concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61186668A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5842043Y2 (en) * | 1976-04-23 | 1983-09-22 | 野上鉄工株式会社 | Spraying machine for refractory furnace materials, etc. |
-
1985
- 1985-02-12 JP JP60025996A patent/JPS61186668A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186668A (en) | 1986-08-20 |
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