JP2825680B2 - Dust removal pipe for spraying method - Google Patents
Dust removal pipe for spraying methodInfo
- Publication number
- JP2825680B2 JP2825680B2 JP3157377A JP15737791A JP2825680B2 JP 2825680 B2 JP2825680 B2 JP 2825680B2 JP 3157377 A JP3157377 A JP 3157377A JP 15737791 A JP15737791 A JP 15737791A JP 2825680 B2 JP2825680 B2 JP 2825680B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- diameter
- tip
- discharge pipe
- dust removal
- 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
- 239000000428 dust Substances 0.000 title claims description 21
- 238000005507 spraying Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000554155 Andes Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 102200124760 rs587777729 Human genes 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Lining And Supports For Tunnels (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Nozzles (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、トンネルのような天井
や壁面に、モルタル又はコンクリートと急結材を混合し
て吹付ける工法において粉塵の発生を減少させる技術に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing the generation of dust in a construction method in which mortar or concrete and a quick-setting material are mixed and sprayed on a ceiling or a wall such as a tunnel.
【０００２】[0002]
【従来の技術とその問題点】現在一般に実施されている
湿式法、乾式法のいずれの吹付工法においても均一な混
合が得られないことが多く、このため吹付面上に縞模様
が現れたり、粉塵が多量に発生する。粉塵の発生を減少
させるために粉塵低減剤を用いることも行われている
が、施工コストが増大するので実際上有効な解決手段で
はない。2. Description of the Related Art In most cases, uniform mixing cannot be obtained by any of a wet method and a dry method, which are generally used at present, so that a stripe pattern appears on a spray surface, A large amount of dust is generated. Although the use of a dust reducing agent to reduce the generation of dust is also performed, it is not a practically effective solution because the construction cost increases.
【０００３】これを改善するため球状混合室とノズルを
組み合わせた混合管が提案されている（特願平２−４１
１３２６）が、混合室内の掃除を頻繁に行なう必要があ
り使用上の環境及び条件が良好でないと作業能率上好ま
しくないことが経験された。In order to improve this, a mixing tube combining a spherical mixing chamber and a nozzle has been proposed (Japanese Patent Application No. 2-41).
1326), however, it was necessary to frequently clean the mixing chamber, and if the environment and conditions for use were not good, it was not preferable in terms of work efficiency.
【０００４】[0004]
【解決しようとする課題】従来試みられてきた、混合部
におけるモルタル又はコンクリートと急結材との混合効
率を向上させることによって発生粉塵を低減させること
は限界があるため、本発明等は混合部と吹付ノズルの吐
出管上に粉塵除去手段を介装させることによって低コス
ト施工を可能にできるものと確信し、種々実験した結
果、本発明に至った。Since there is a limit in reducing the generated dust by improving the mixing efficiency of the mortar or concrete and the quick-setting material in the mixing section, which has been attempted in the past, there is a limit. It was convinced that low-cost construction could be achieved by interposing a dust removing means on the discharge pipe of the spray nozzle, and as a result of various experiments, the present invention was reached.
【０００５】[0005]
【解決手段】本発明粉塵除去管は、吐出管の一次側に接
続するテーパ管開口先端とこれを囲繞し、且つ吐出管の
二次側に向けて縮径し吐出管に接続する胴部と、該胴部
先端と前記テーパ管先端間に放出空間が設けられると共
に該胴部の中心より基部側に接続する吸引管を備えて構
成され、絞り部開口先端直径と吐出管径の比が９０〜３
５であり、胴部の直径は吐出管径の１．２〜３倍として
構成されている。テーパ管の絞り比が９７より大きいと
絞り効果が小さくなり１５以下では材料の詰りが生じ易
くなる。また管径比が約３倍以上になると胴部先端側の
二次側吐出管で閉塞を生じ易くなる。なお、吸引管の直
径はテーパ管先端直径より小さいこと及び取付角度は９
０°以下とすることは勿論であり、吸引負圧は５〜１０
０（ｍｍＨｇ）の範囲とする。テーパ管先端位置は胴部
の一次側から３／４以下で吸引管に達しない位置である
ことが好ましい。更にテーパ部はゆるやかなテーパとす
るのがよい。本発明において胴部の形状は前後非対称形
状であってもよい。除去管は吹付ノズルから５ｍ（Ｌ）
以内が好ましい。The dust removing pipe includes a tapered pipe opening tip connected to a primary side of a discharge pipe, a body surrounding the tapered pipe opening, and having a diameter reduced toward a secondary side of the discharge pipe and connected to the discharge pipe. A discharge space is provided between the tip of the body and the tip of the tapered pipe, and a suction pipe connected to the base side of the center of the body is provided. ~ 3
The diameter of the body is 1.2 to 3 times the diameter of the discharge pipe. If the drawing ratio of the tapered tube is larger than 97, the drawing effect becomes small, and if it is 15 or less, clogging of the material tends to occur. When the pipe diameter ratio is about three times or more, the secondary discharge pipe at the tip of the body tends to be clogged. The diameter of the suction tube is smaller than the diameter of the tapered tube tip, and the mounting angle is 9
Of course, the suction negative pressure is 5 to 10 ° or less.
0 (mmHg). It is preferable that the tapered tube tip position is a position that does not reach the suction tube within 3/4 or less from the primary side of the body. Further, it is preferable that the tapered portion has a gentle taper. In the present invention, the shape of the trunk may be asymmetrical in the front-rear direction. The removal pipe is 5m (L) from the spray nozzle
Is preferably within.
【０００６】[0006]
【実施例】図１において１はモルタル又はコンクリート
圧送機、２は供給管、３は急結材供給機、４はその供給
管、５はＹ管又はインレットピースなどの混合部、６は
吐出管、７は本発明除去管、８は吹付ノズル、９は吹付
面、６ａは吐出管の一次側、６ｂは吐出管の二次側であ
る。In FIG. 1, 1 is a mortar or concrete pump, 2 is a supply pipe, 3 is a quick setting material feeder, 4 is its supply pipe, 5 is a mixing section such as a Y pipe or an inlet piece, and 6 is a discharge pipe. , 7 denotes the removal pipe of the present invention, 8 denotes a spray nozzle, 9 denotes a spray surface, 6a denotes a primary side of the discharge pipe, and 6b denotes a secondary side of the discharge pipe.
【０００７】除去管の構造は図２の如くであって、１０
はテーパ管のテーパ部、１０ａは開口先端、１１は胴
部、１２はその一次側の基部、１３は先端側、１４は吸
引管であって図示しない多孔フィルタを介して吸引ポン
プに接続している。１５は胴部先端とテーパ管開口先端
間の放出空間である。The structure of the removal tube is as shown in FIG.
Is a tapered portion of a tapered tube, 10a is an opening tip, 11 is a trunk portion, 12 is a base portion on the primary side, 13 is a tip side, and 14 is a suction tube, which is connected to a suction pump via a porous filter (not shown). I have. Reference numeral 15 denotes a discharge space between the body tip and the tapered tube opening tip.
【０００８】[0008]
【作用】テーパ管開口先端から送出された混練物は放出
空間において体積膨張し、この時周囲の負圧によって混
練物中の粉塵は胴部外周域（負圧域）１６に飛散し吸引
管から抜き出される。The kneaded material discharged from the opening end of the tapered tube expands in volume in the discharge space. At this time, dust in the kneaded material is scattered to the outer peripheral region (negative pressure region) 16 of the body by the surrounding negative pressure, and from the suction tube. It is extracted.
【０００９】[0009]
【試験例】使用材料 セメント：普通ポルトランドセメント アンデスセメン
ト株式会社製 砂：新潟県姫川産（５ｍｍ下） 砂利：新潟県姫川産（Ｇmax １５ｍｍ） 急結材：商品名「デンカナトミック Type−５」 電気
化学工業株式会社製[Test example] Materials used Cement: Ordinary Portland cement manufactured by Andes Cement Co., Ltd. Sand: Himekawa, Niigata (5mm below) Gravel: Himekawa, Niigata (Gmax 15mm) Quick-setting material: Trade name "Denkanatomic Type-5" Made by Denki Kagaku Kogyo Co., Ltd.
【００１０】単位セメント量＝３６０ｋｇ／ｍ3 、ｗ／
ｃ＝６０％、ｓ／ａ＝６０％の配合で混練りしたコンク
リートを用い急結材の使用量はセメントに対し５重量％
とし、湿式吹付工法によって表１に示す各種、粉塵除去
管の試験を実施した。試験方法は、高さ４ｍ、幅３ｍの
模擬トンネル内において、コンクリートを各１ｍ3 吹付
け、その時に発生した粉塵量も測定した。コンクリート
の圧送管の直径Ｄは６．７ｃｍ、吹付圧３．５ｋｇ／ｃ
ｍ2 、吸引圧力５０ｍｍＨｇとした。その結果を表１に
併記する。Unit cement amount = 360 kg / m 3 , w /
Using kneaded concrete with a mixture of c = 60% and s / a = 60%, the amount of quick-setting material used is 5% by weight based on cement.
The various dust removal tubes shown in Table 1 were tested by the wet spraying method. In the test method, concrete was sprayed in an amount of 1 m 3 each in a simulated tunnel having a height of 4 m and a width of 3 m, and the amount of dust generated at that time was also measured. The diameter D of the concrete pressure pipe is 6.7 cm, and the spray pressure is 3.5 kg / c.
m 2 , and a suction pressure of 50 mmHg. The results are also shown in Table 1.
【００１１】[0011]
【表１】 [Table 1]
【００１２】本発明の粉塵除去管を使用することによっ
て吹付け時に発生する粉塵を大幅に低減することが明ら
かである。It is evident that the use of the dust removal tube of the present invention significantly reduces dust generated during spraying.
【００１３】[0013]
【発明の効果】本発明による効果は次の通りである。 １）吹付け時に発生する粉塵を大幅に減少できるので作
業環境を改善することができる。 ２）粉塵低減剤などの混和剤を使用しないで低コストで
粉塵の抑制が可能となる。The effects of the present invention are as follows. 1) Dust generated at the time of spraying can be greatly reduced, so that the working environment can be improved. 2) Dust can be suppressed at low cost without using an admixture such as a dust reducing agent.
【図１】本発明粉塵除去管を装着した吹付装置の全体図FIG. 1 is an overall view of a spraying apparatus equipped with a dust removing tube of the present invention.
【図２】本発明粉塵除去管の断面図FIG. 2 is a sectional view of the dust removing tube of the present invention.
６は吐出管 ７は本発明除去管 １０ａは開口先端 １１は胴部 １４は吸引管 6 is a discharge pipe 7 is a removal pipe of the present invention 10a is an opening tip 11 is a trunk 14 is a suction pipe
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E21D 11/10 B05B 7/14 E04G 21/02 103──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) E21D 11/10 B05B 7/14 E04G 21/02 103
Claims (2)
合物を送出する吐出管に介装される粉塵除去管であっ
て、前記吐出管の一次側に接続するテーパ管開口先端と
これを囲繞し、且つ吐出管の二次側に向けて縮径して前
記吐出管に接続する胴部と、該胴部先端と前記テーパ管
先端間に放出空間が設けられると共に該胴部の中心より
基部側に接続する吸引管を備えて構成され、前記テーパ
管開口先端直径と吐出管径の比が９０〜３５であり、胴
部の直径は吐出管径の１．２〜３倍として構成されてい
ることを特徴とする吹付工法用粉塵除去管。1. A dust removal pipe interposed in a discharge pipe for delivering a mixture of mortar or concrete and a quick-setting material, the tapered pipe opening end connected to the primary side of the discharge pipe and surrounding the same. And a body connected to the discharge pipe by reducing the diameter toward the secondary side of the discharge pipe, and a discharge space is provided between the tip of the body and the tip of the tapered pipe, and a base side from the center of the body. The ratio of the diameter of the tapered pipe opening tip to the diameter of the discharge pipe is 90 to 35, and the diameter of the body is 1.2 to 3 times the diameter of the discharge pipe. A dust removal pipe for a spraying method.
３／４以内で且つ吸引管接続部に達しない位置に設定さ
れてなる請求項１記載の粉塵除去管。2. The dust removal pipe according to claim 1, wherein the tip end of the tapered pipe opening is set to a position within 3/4 from the primary side of the body and not to reach the suction pipe connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3157377A JP2825680B2 (en) | 1991-06-03 | 1991-06-03 | Dust removal pipe for spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3157377A JP2825680B2 (en) | 1991-06-03 | 1991-06-03 | Dust removal pipe for spraying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04357299A JPH04357299A (en) | 1992-12-10 |
| JP2825680B2 true JP2825680B2 (en) | 1998-11-18 |
Family
ID=15648329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3157377A Expired - Fee Related JP2825680B2 (en) | 1991-06-03 | 1991-06-03 | Dust removal pipe for spraying method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2825680B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112657698B (en) * | 2020-12-23 | 2025-08-01 | 中建材科创新技术研究院(山东)有限公司 | Pneumatic spray gun and method for spraying solid waste cementing material |
-
1991
- 1991-06-03 JP JP3157377A patent/JP2825680B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04357299A (en) | 1992-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980831 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
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| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
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| LAPS | Cancellation because of no payment of annual fees |