GB2025794A - Nozzles - Google Patents
Nozzles Download PDFInfo
- Publication number
- GB2025794A GB2025794A GB7829962A GB7829962A GB2025794A GB 2025794 A GB2025794 A GB 2025794A GB 7829962 A GB7829962 A GB 7829962A GB 7829962 A GB7829962 A GB 7829962A GB 2025794 A GB2025794 A GB 2025794A
- Authority
- GB
- United Kingdom
- Prior art keywords
- apertures
- series
- nozzle
- mixing chamber
- powder
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
- B28C5/026—Mixing guns or nozzles; Injector mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/149—Spray pistols or apparatus for discharging particulate material with separate inlets for a particulate material and a liquid to be sprayed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Nozzles (AREA)
Abstract
A nozzle for spraying cementitious material has a mixing chamber 11 which receives powder from a hose 10, and a coaxial compartment 13 separated by a sleeve 14 from the mixing chamber. The compartment receives water under pressure which passes through apertures arranged in circumferential series 17a-17e in the sleeve, the apertures in each series being angularly off-set from those in the adjacent series. This produces a plurality of radial water jets in the mixing chamber 11 to secure substantially uniform wetting and hydration of powder entering the chamber. The nozzle is to be primarily used in spraying concrete to build up structures and linings e.g. in tunnels. <IMAGE>
Description
SPECIFICATION
Improved Hydro Powder Mixer Nozzle
This invention relates to a nozzle for spraying concrete, for example in building up wall surfaces and structural parts on a supporting structure, or on a former which is later to be removed, and appiicable in, for example lining tunnels and excavations.
In spraying concrete mixtures, the cement powder must be mixed at some stage with water.
Because of a tendency for the wetted cement to begin gelling quickly, it is usually the practice to add the water to the cement powder at the last possible moment, e.g. in or immediately before the nozzle.
It is found, however, for example with coaxial jets or separate feeds converging on a common nozzle, that the wetting of the cement powder is uneven, some parts being satisfactorily wetted, but others being left substantially dry. This is, of course, disadvantageous as a structure of several sprayed layers of concrete is seriously weakened if parts of the concrete have not gelled due to remaining dry.
An object of the present invention is to overcome the problem of uneven wetting of sprayed concrete.
Accordingly, the invention provides a nozzle for spraying concrete having a mixing chamber which receives dry concrete powder through a supply hose, and water into a coaxial compartment defined by a cylindrical sleeve in the mixing chamber, the sleeve having one or more circular series of apertures extending around the sleeve and communicating between the mixing chamber and the compartment.
Preferably each series of apertures comprises from 5 to 6 apertures, and each successive series has its apertures angularly staggered with respect to the previous series, so that substantially the entire cross-section of the powder stream can be wetted.
In the accompanying drawings, wherein Fig. 1 is a longitudinal cross-sectional view of a nozzle according to the invention, and Fig. 2 a crosssection on line Il-Il of Fig. 1, a preferred embodiment of the invention is illustrated by way of example.
As shown in the drawings, the nozzle is fed with powdered cement mix through a hose 10, the mix being blown in its dry state. The powder enters a mixing chamber 11 contained in a housing 12 and separated from a coaxial compartment 13 by a spool 14. A nozzle 15, which may be replaceable for desired spraying effects, is connected to the outlet end of housing 12 by grub screws 16.
The spool 14 is provided with five series of apertures 1 7a to 1 7e, each comprising 1 6 apertures arranged on a circumference of the spool 14. In accordance with a preferred feature of the invention, the apertures of each successive series 1 7a-1 7e are angularly offset with respect to those in the preceding series, and the amount of the off-set between one series and the next is 1/5 the angle between adjacent apertures in any series, the apertures being equally spaced.
That is, the apertures in each series are 2205 apart, and the off-set between the apertures in successive series is 405. This helps to maximise the wetting effect of water passing through the apertures into the mixing chamber 11.
Water under pressure enters the compartment 13 via port 18, and is forced through the apertures 1 7a-1 7e forming a plurality of jets playing radially of the mixing chamber 11. The off-set of successive series of apertures ensures that these jets wet the whole cross-section of the flow of cement mix powder substantially evenly, thereby avoiding pockets and 'bubbles' of unwetted powder.
The described embodiment enables thorough hydration to take place at the last possible moment, so that clogging of the nozzle by gelling cement is reduced.
The water may be doped with an accelerator such as sodium silicate, so that the cement sets quickly after spraying whereby collapse of wet cement is avoided, and in spraying a multi-layer coating, a further layer can be sprayed without undue delay.
Claims
1. A nozzle for spraying a cementitious mixture having a mixing chamber to receive dry cementitious powder through a supply hose, and water into a coaxial compartment defined by a cylindrical sleeve in the mixing chamber the sleeve having one or more circular series of apertures extending around the sleeve and communicating between the mixing chamber and the compartment.
2. A nozzle according to Claim 1, wherein the apertures of each successive series are angularly off-set with regard to those of an adjacent series.
3. A nozzle for spraying a cementitious mixture substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
New Claims or Amendments to Claims filed on 12.4.79.
Superseded Claims 1-3.
New Claims
1. A nozzle for spraying a cementitious mixture having a mixing chamber to receive dry cementitious powder thro through a supply hose, and water into a coaxial compartment defined by a cylindrical sleeve in the mixing chamber, the sleeve having two or more circular series of apertures extending around the sleeve, the apertures of which are angularly offset with respect to each other, and communicate between the mixing chamber and the compartment.
2. A nozzle according to claim 1 wherein four successive series of apertures are provided, the apertures of which are angularly offset with respect to those of each adjacent series.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A nozzle for spraying a cementitious mixture having a mixing chamber to receive dry cementitious powder thro through a supply hose, and water into a coaxial compartment defined by a cylindrical sleeve in the mixing chamber, the sleeve having two or more circular series of apertures extending around the sleeve, the apertures of which are angularly offset with respect to each other, and communicate between the mixing chamber and the compartment.
2. A nozzle according to claim 1 wherein four successive series of apertures are provided, the apertures of which are angularly offset with respect to those of each adjacent series.
3. A nozzle according to claim 1 or 2 wherin the apertures of each succeding series are angularly offset with respect to those of the preceding series by from 30 to 100.
4. A nozzle according to claim 3 wherein said apertures in each successive series are offset by angle of approximately 50 from those in each preceding series.
5. A nozzle for spraying a cementitious mixture substantially as hereinbefore described with reference and as illustrated in the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7829962A GB2025794A (en) | 1978-07-14 | 1978-07-14 | Nozzles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7829962A GB2025794A (en) | 1978-07-14 | 1978-07-14 | Nozzles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2025794A true GB2025794A (en) | 1980-01-30 |
Family
ID=10498446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7829962A Withdrawn GB2025794A (en) | 1978-07-14 | 1978-07-14 | Nozzles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2025794A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2143443A (en) * | 1983-07-16 | 1985-02-13 | Lechler Gmbh & Co Kg | Cylindrical inserts for two-substance spray nozzles and nozzles incorporating such inserts |
EP0223433A1 (en) * | 1985-10-22 | 1987-05-27 | Electric Power Research Institute, Inc | Abrasive entrained high pressure fluid jet nozzle |
WO2002053337A1 (en) * | 2000-12-18 | 2002-07-11 | Feda Alicehajic | Jet nozzle for spraying fast-drying concrete |
WO2005098333A1 (en) * | 2004-04-05 | 2005-10-20 | Shinagawa Refractories Australasia Pty Ltd | Slurry installation method and apparatus |
CN100551509C (en) * | 2007-06-28 | 2009-10-21 | 门正国 | A kind of pressed powder, particle dissolution dispersing device |
CN104492296A (en) * | 2014-12-04 | 2015-04-08 | 苏州国环环境检测有限公司 | Directional solution concentration regulating device |
CN104492298A (en) * | 2014-12-04 | 2015-04-08 | 苏州国环环境检测有限公司 | Powder spraying and falling detection system for preventing occupational disease |
DE102016124101A1 (en) | 2016-12-12 | 2018-06-14 | Refratechnik Holding Gmbh | Mixing nozzle for a shotcrete application device, as well as shotcrete application device with such a mixing nozzle and shotcrete application method |
DE102016124102A1 (en) | 2016-12-12 | 2018-06-14 | Refratechnik Holding Gmbh | Mixing nozzle for a shotcrete application device, as well as shotcrete application device with such a mixing nozzle and shotcrete application method |
-
1978
- 1978-07-14 GB GB7829962A patent/GB2025794A/en not_active Withdrawn
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2143443A (en) * | 1983-07-16 | 1985-02-13 | Lechler Gmbh & Co Kg | Cylindrical inserts for two-substance spray nozzles and nozzles incorporating such inserts |
EP0223433A1 (en) * | 1985-10-22 | 1987-05-27 | Electric Power Research Institute, Inc | Abrasive entrained high pressure fluid jet nozzle |
WO2002053337A1 (en) * | 2000-12-18 | 2002-07-11 | Feda Alicehajic | Jet nozzle for spraying fast-drying concrete |
WO2005098333A1 (en) * | 2004-04-05 | 2005-10-20 | Shinagawa Refractories Australasia Pty Ltd | Slurry installation method and apparatus |
CN100551509C (en) * | 2007-06-28 | 2009-10-21 | 门正国 | A kind of pressed powder, particle dissolution dispersing device |
CN104492296A (en) * | 2014-12-04 | 2015-04-08 | 苏州国环环境检测有限公司 | Directional solution concentration regulating device |
CN104492298A (en) * | 2014-12-04 | 2015-04-08 | 苏州国环环境检测有限公司 | Powder spraying and falling detection system for preventing occupational disease |
CN104492296B (en) * | 2014-12-04 | 2016-06-08 | 苏州国环环境检测有限公司 | The directed concentration adjusting device of solution |
DE102016124101A1 (en) | 2016-12-12 | 2018-06-14 | Refratechnik Holding Gmbh | Mixing nozzle for a shotcrete application device, as well as shotcrete application device with such a mixing nozzle and shotcrete application method |
DE102016124102A1 (en) | 2016-12-12 | 2018-06-14 | Refratechnik Holding Gmbh | Mixing nozzle for a shotcrete application device, as well as shotcrete application device with such a mixing nozzle and shotcrete application method |
WO2018108679A1 (en) | 2016-12-12 | 2018-06-21 | Refratechnik Holding Gmbh | Mixing nozzle for a gunned-concrete application device, gunned-concrete application device having such a mixing nozzle, and gunned-concrete application method |
WO2018108678A1 (en) | 2016-12-12 | 2018-06-21 | Refratechnik Holding Gmbh | Mixing nozzle for a shotcrete application device, and a shotcrete application device comprising such a mixing nozzle, and a shotcrete application method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2661194A (en) | Mixer for use in jetting apparatus | |
US4708745A (en) | Process for the preparation and application in situ of blends of structural material | |
US4931098A (en) | Method for adding silica fume to dry shotcrete mixture | |
JPS56124465A (en) | Method and apparatus for spraying cement mortar, etc. | |
GB2025794A (en) | Nozzles | |
US4586823A (en) | Device for mixing and applying wet concrete | |
GB1579543A (en) | Method for mixing a particulate solid material with a liquid material and a nozzle for use in said method | |
US3730763A (en) | Method for dry packing of surfaces | |
US2025974A (en) | Mixing nozzle | |
US2705132A (en) | Spray guns | |
KR100989428B1 (en) | The structure repair method of construction for which mortar, this injection equipment and this were used | |
GB2060420A (en) | Improvements in or relating to the production of foam | |
US1670677A (en) | Process of and apparatus for mixing and applying mortar | |
ES8101459A1 (en) | Concrete-mixer | |
US3669418A (en) | Method of spraying concrete | |
US1507773A (en) | Cement-gun nozzle | |
US2534116A (en) | Apparatus for spraying cementitious compositions | |
JPS6023229B2 (en) | Spraying method | |
US1847261A (en) | Method of and apparatus for pouring gypsum or like material | |
SU1315616A1 (en) | Installation for preparing shotcrete and plugging composition | |
SU390244A1 (en) | DEVICE FOR PREPARATION OF TORKRET-CONCRETE | |
US2213640A (en) | Plastic material mixing device | |
SU1004117A1 (en) | Apparatus for preparing foamed-gypsum mixes | |
SU1370204A1 (en) | Shotcreting nozzle | |
JPS605966A (en) | Addition of liquid mixing agent in spray concrete |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |