WO2007134610A1 - Method and means for lubricating pump hoses, pipes and systems prior to pumping concrete - Google Patents
Method and means for lubricating pump hoses, pipes and systems prior to pumping concrete Download PDFInfo
- Publication number
- WO2007134610A1 WO2007134610A1 PCT/DK2007/000245 DK2007000245W WO2007134610A1 WO 2007134610 A1 WO2007134610 A1 WO 2007134610A1 DK 2007000245 W DK2007000245 W DK 2007000245W WO 2007134610 A1 WO2007134610 A1 WO 2007134610A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- clay
- group
- concrete
- pipes
- pump
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/32—Conveying concrete, e.g. for distributing same at building sites
Definitions
- the present invention relates to a novel method and a means therefor for lubricating pump hoses, pipes, and systems prior to pumping concrete.
- a concrete pump For pumping fresh concrete, a concrete pump is used, said pump being able to move concrete over long distances by means of hoses and pipes.
- a concrete pump is typically used for major castings and building activities, where it can reach a large area from one and the same place.
- a receiving vessel is located upstream of the pump, said vessel being in the form of a funnel or a vessel, whereto truck mixers can transfer their contents of fresh concrete.
- Concrete pumps of different sizes are available for different purposes. The largest pumps may have a reach of up to 52 meters and pump up to 160 m 3 concrete per hour. However, this is rarely necessary, and it is most normal to use a smaller pump having a reach of 30 to 40 meters. Moreover, there are pumps allowing to pour concrete in locations with low ceiling space, so called critical headroom pumps.
- the object of the lubrication is to ensure that pumping can be carried out without undue delays due to blockages caused by the formation of gravel clusters etc.
- the gravel concrete for such a lubrication comprises about 0,5 m 3 and is delivered separately or is placed at the top of the upper blades of the drum on top of the concrete product to be pumped.
- the gravel concrete is loaded into the vessel or funnel on the upstream side of the pump and pumped through hoses, pipes etc. Excess material, i.e.
- the material not used as lubricant is discarded or incorporated into the concrete, as described for state of the art procedures.
- the lubricant used in the art in the form of gravel concrete implies several use-related, environmental and economic disadvantages. Gravel concrete is difficult to em- ploy and causes environmental problems by the disposal thereof. When incorporating an excess of gravel concrete in the casting job, the gravel concrete will result in an inhomogeneous finished product after casting.
- US 2005/0274294 A1 discloses the use of i.a. bentonite to improve the pumpa- bility when dry casting cementitious compositions, where bentonite is added in solid form and is used to increase the viscosity of the mixture to be cast.
- US 2004/0198873 A1 discloses the use of for example solid bentonite as pumping aid to increase the viscosity during pumping of concrete mixtures.
- the object of the present invention is therefore to provide a novel method for lubricating pump hoses, pipes, and systems prior to pumping concrete as well as a means for using said method.
- a method for lubricating pump hoses, pipes, and systems during pumping of fresh concrete where a suitable amount for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days is added to the funnel, container or vessel upstream of a concrete pump, said slurry being pushed through hoses and pipes by means of the following fresh concrete.
- the clay comprises clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group, said clay being suspended in water at natural pH with stirring in an amount of 5-30, preferably 8-20 and more pref- erably 10-14% by weight of dry solid, to obtain a consistency, which matches the pump hoses, pipes, and systems used to pump concrete, said clay being left for maturing during stirring for 1-7 days, preferably 1-2 days, prior to use.
- said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
- the clay minerals are in particular selected from the smectite group.
- a substantial portion of the clay mineral such as 90-50, preferably 80- 60 and in particular 70% by weight, is montmorillonite.
- the clay is bentonite, in particular calcium bentonite.
- a means for lubricating pump hoses, pipes, and systems during pumping of fresh concrete comprising an amount suitable for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days.
- the means comprises an aqueous slurry matured and stabilized at natural pH for 1 to 7 days, preferably 1 to 2 days, and having a consistency, which matches the rubber hoses, pipes, and systems used to pump concrete, said means containing 5-30, preferably 8-20 and more preferably 10-14% by weight of dry solid of a clay comprising clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
- said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
- the clay minerals are in particular selected from the smectite group.
- a substantial portion of the clay mineral such as 90-50, preferably 80-60 and in particular 70% by weight, is montmorillonite.
- the clay is bentonite, in particular calcium bentonite.
- lubrication signify that pump hoses, pipes, and systems are being prepared by coating the inner surfaces thereof with the lubricant.
- lubricant signifies a means for said preparation of pump hoses, pipes, and systems prior to pumping fresh concrete.
- gravel concrete signifies a mixture of cement, water, and sand.
- truck mixer signifies a rotating concrete mixer mounted on a lorry. Typically, such a truck mixer transports about 6-9 m 3 fresh concrete at a time.
- grain clusters signifies an accumulation of coarse aggregates, which may block the transfer of concrete in pump hoses, pipes, and systems.
- the finished product is to have a viscosity ensuring a sufficient thickness of the lubricant layer on the inner surfaces of pump hoses, pipes, and systems, so that the layer exhibits the necessary robustness, while the slurry exhibits great stability, so that possible precitation after longer periods of standing is avoided.
- the used amount of dry solids of clay is 5-30, preferably 8- 20 and more preferably 10-14% by weight of dry solid.
- the lubricant is a natural, environmentally neutral product added directly to the funnel, vessel or container of the concrete pump and is pumped through hoses etc. prior to using the concrete pump for pumping fresh concrete.
- the slurry appears to be stable for at least 12 months at temperatures of +2 0 C to +5O 0 C.
- the slurry is drawn off into e.g. 10 litre plastic canisters as a means for lubricating pump hoses, pipes, and systems prior to pumping fresh concrete.
- the amount of Iu- bricant used depends on the size of the pump and the length of the hose, but normally comprises about 10 kg and for extra pipe sections and hoses up to about 20 kg. Lubrication tests have shown that a durable (robust) lubricant layer is obtained.
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Lubricants (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
A means comprising a suitable amount of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days is used in a method for lubricating pump hoses, pipes, and systems during pumping of fresh concrete.
Description
Title: Method and means for lubricating pump hoses, pipes and systems prior to pumping concrete
Technical Field
The present invention relates to a novel method and a means therefor for lubricating pump hoses, pipes, and systems prior to pumping concrete.
Background of the Invention
For pumping fresh concrete, a concrete pump is used, said pump being able to move concrete over long distances by means of hoses and pipes. A concrete pump is typically used for major castings and building activities, where it can reach a large area from one and the same place.
A receiving vessel is located upstream of the pump, said vessel being in the form of a funnel or a vessel, whereto truck mixers can transfer their contents of fresh concrete. Concrete pumps of different sizes are available for different purposes. The largest pumps may have a reach of up to 52 meters and pump up to 160 m3 concrete per hour. However, this is rarely necessary, and it is most normal to use a smaller pump having a reach of 30 to 40 meters. Moreover, there are pumps allowing to pour concrete in locations with low ceiling space, so called critical headroom pumps.
It is know in the art to lubricate the inner surfaces of pumps and hoses, pipes etc. using a gravel concrete of the same strength class as the concrete to be pumped thereafter immediately prior to pumping fresh concrete. The object of the lubrication is to ensure that pumping can be carried out without undue delays due to blockages caused by the formation of gravel clusters etc. The gravel concrete for such a lubrication comprises about 0,5 m3 and is delivered separately or is placed at the top of the upper blades of the drum on top of the concrete product to be pumped. The gravel concrete is loaded into the vessel or funnel on the upstream side of the pump and pumped through hoses, pipes etc.
Excess material, i.e. the material not used as lubricant, is discarded or incorporated into the concrete, as described for state of the art procedures. The lubricant used in the art in the form of gravel concrete implies several use-related, environmental and economic disadvantages. Gravel concrete is difficult to em- ploy and causes environmental problems by the disposal thereof. When incorporating an excess of gravel concrete in the casting job, the gravel concrete will result in an inhomogeneous finished product after casting.
US 2005/0274294 A1 discloses the use of i.a. bentonite to improve the pumpa- bility when dry casting cementitious compositions, where bentonite is added in solid form and is used to increase the viscosity of the mixture to be cast.
US 2004/0198873 A1 discloses the use of for example solid bentonite as pumping aid to increase the viscosity during pumping of concrete mixtures.
Surprisingly, it has now been found that the use of a suitable amount of a clay described in greater detail below in slurry form for lubricating pump hoses, pipes, and systems prior to pumping concrete is able to completely replace the state of the art gravel concrete having said disadvantages. The economic ad- vantages include improved usage of the capacity of the concrete production unit, since it is no longer encumbered with having to produce gravel concrete. Furthermore, separate deliveries of gravel concrete by truck mixers ceases, for which reason, a special logistics is redundant in connection with concrete deliveries to the pump. At the same time, an easy and simple method is carried out, ensuring an effective lubrication of the pump hoses, pipes, and systems, while the amount of excess lubricating material is reduced by up to 98%. Moreover, each pump operator may lubricate his own material independently of others.
The object of the present invention is therefore to provide a novel method for lubricating pump hoses, pipes, and systems prior to pumping concrete as well as a means for using said method.
The object is achieved by the method and the means according to the invention.
Summary of the Invention
According to the invention, there is provided a method for lubricating pump hoses, pipes, and systems during pumping of fresh concrete, where a suitable amount for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days is added to the funnel, container or vessel upstream of a concrete pump, said slurry being pushed through hoses and pipes by means of the following fresh concrete.
In accordance with a preferred embodiment of the method according to the invention, the clay comprises clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group, said clay being suspended in water at natural pH with stirring in an amount of 5-30, preferably 8-20 and more pref- erably 10-14% by weight of dry solid, to obtain a consistency, which matches the pump hoses, pipes, and systems used to pump concrete, said clay being left for maturing during stirring for 1-7 days, preferably 1-2 days, prior to use.
In accordance with another embodiment of the method according to the present invention, said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
In accordance with another embodiment of the method according to the inven- tion, the clay minerals are in particular selected from the smectite group.
In accordance with yet another embodiment of the method according to the invention, a substantial portion of the clay mineral, such as 90-50, preferably 80- 60 and in particular 70% by weight, is montmorillonite.
In accordance with yet 'another embodiment of the method according to the in- vention, the clay is bentonite, in particular calcium bentonite.
According to the present invention, there is also provided a means for lubricating pump hoses, pipes, and systems during pumping of fresh concrete, comprising an amount suitable for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days.
In accordance with an embodiment of the means according to the invention, it comprises an aqueous slurry matured and stabilized at natural pH for 1 to 7 days, preferably 1 to 2 days, and having a consistency, which matches the rubber hoses, pipes, and systems used to pump concrete, said means containing 5-30, preferably 8-20 and more preferably 10-14% by weight of dry solid of a clay comprising clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
In accordance with another embodiment of the means according to the inven- tion, said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
In accordance with another embodiment of the means according to the inven- tion, the clay minerals are in particular selected from the smectite group.
In accordance with another preferred embodiment of the means according to the invention, a substantial portion of the clay mineral, such as 90-50, preferably 80-60 and in particular 70% by weight, is montmorillonite.
In accordance with another embodiment of the means according to the invention, the clay is bentonite, in particular calcium bentonite.
The scope of the applicability of the invention will appear from the following de- tailed description. However, it is to be understood, that the detailed description and the specific examples, even though they state preferred embodiments of the invention, are only given by way of illustration, and various changes and
modifications within the scope of the invention will become apparent to the person skilled in the art when reading the detailed description.
Detailed Description of the Invention
The terms "lubrication", "lubricating" and "lubricate", as used herein, signify that pump hoses, pipes, and systems are being prepared by coating the inner surfaces thereof with the lubricant.
The term "lubricant", as used herein, signifies a means for said preparation of pump hoses, pipes, and systems prior to pumping fresh concrete.
The term "gravel concrete", as used herein, signifies a mixture of cement, water, and sand.
The term "truck mixer", as used herein, signifies a rotating concrete mixer mounted on a lorry. Typically, such a truck mixer transports about 6-9 m3 fresh concrete at a time.
The term "gravel clusters", as used herein, signifies an accumulation of coarse aggregates, which may block the transfer of concrete in pump hoses, pipes, and systems.
By the method according to the invention, one or more clays selected from the group consisting of smectite, vermiculite and chlorite, more preferably mont- morillonite and in particular a bentonite, especially calcium bentonite, are suspended in a suitable amount of water, and these slurries are stabilized during maturation at natural pH. The finished product is to have a viscosity ensuring a sufficient thickness of the lubricant layer on the inner surfaces of pump hoses, pipes, and systems, so that the layer exhibits the necessary robustness, while the slurry exhibits great stability, so that possible precitation after longer periods of standing is avoided. In order to achieve a slurry having both sufficient viscos-
2007/000245
ity and high stability, the used amount of dry solids of clay is 5-30, preferably 8- 20 and more preferably 10-14% by weight of dry solid.
The lubricant is a natural, environmentally neutral product added directly to the funnel, vessel or container of the concrete pump and is pumped through hoses etc. prior to using the concrete pump for pumping fresh concrete.
Example
24 kg natural calcium bentonite having a moisture content of about 50% is added to a 100 litre vessel equipped with a slow stirrer and supplied with 76 kg water. The mixture is stirred slowly for 26 hours, thus obtaining a stable slurry having a density at 2O0C of 1.07 ± 0.02 kg/I (according to DS/ISO 758). The dry solid content is 12.0 ± 1.0% (EN 480-8). Equivalent Na2O is < 0.20% (EN 480- 12). Water-soluble chloride (CP) is < 0.01% (DS/EN 1744-1). The pH value of the slurry appears to be 8.0 ± 1.0 (ISO 4316). During storage the slurry appears to be stable for at least 12 months at temperatures of +20C to +5O0C. The slurry is drawn off into e.g. 10 litre plastic canisters as a means for lubricating pump hoses, pipes, and systems prior to pumping fresh concrete. The amount of Iu- bricant used depends on the size of the pump and the length of the hose, but normally comprises about 10 kg and for extra pipe sections and hoses up to about 20 kg. Lubrication tests have shown that a durable (robust) lubricant layer is obtained.
The invention thus being described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the scope of the invention, and all such modifications as would be obvious to a person skilled in the art are intended to be included within the scope of the following claims.
Claims
1. A method for lubricating pump hoses, pipes, and systems during pumping of fresh concrete, where a suitable amount for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days is added to the funnel, containers or vessel upstream of a concrete pump, said slurry being pushed through hoses and pipes by means of the following fresh concrete.
2. The method according to claim 1 , where the clay comprises clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group, said clay being suspended in water at natural pH with stirring in an amount of 5-30, preferably 8-20 and more preferably 10-14% by weight of dry solid, to obtain a consistency, which matches the pump hoses, pipes, and systems used to pump concrete, said clay being left for maturing during stirring for 1-7 days, preferably 1-2 days, prior to use.
3. The method according to claim 2, where said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
4. The method according to claim 3, where the clay minerals are in particular selected from the smectite group.
5. The method according to claim 4, where a substantial portion of the clay mineral, such as 90-50, preferably 80-60 and in particular 70% by weight, is montmorillonite.
6. The method according to claim 5, where the clay is bentonite, in particular calcium bentonite.
7. A means for use in the method according to claim 1 for lubricating pump hoses, pipes, and systems during pumping of fresh concrete, comprising an amount suitable for the pumping job of a slurry of a clay matured in water at natural pH during stirring for 1 to 7 days.
8. The means according to claim 7, comprising an aqueous slurry matured and stabilized at natural pH for 1 to 7 days, preferably 1 to 2 days, and having a consistency, which matches the pump hoses, pipes, and systems used to pump concrete, said means containing 5-30, preferably 8-20 and more preferably 10- 14% by weight of dry solid of a clay comprising clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group. •
9. The means according to claim 8, where said clay contains 50-90, preferably 60-80, more preferably 70-75, and in particular 75% by weight of clay minerals selected from the smectite group, the vermiculite group and/or the chlorite group.
10. The means according to claim 9, where the clay minerals are in particular selected from the smectite group.
11. The means according to claim 10, where a substantial portion of the clay mineral, such as 90-50, preferably 80-60 and in particular 70% by weight, is montmorillonite.
12. The means according to claim 11, where the type of clay is bentonite, in particular calcium bentonite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA200600716 | 2006-05-24 | ||
| DK200600716A DK200600716A (en) | 2006-05-24 | 2006-05-24 | Method and means for lubricating pump hoses, pipes and systems in front of concrete pumping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007134610A1 true WO2007134610A1 (en) | 2007-11-29 |
Family
ID=38353818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK2007/000245 WO2007134610A1 (en) | 2006-05-24 | 2007-05-24 | Method and means for lubricating pump hoses, pipes and systems prior to pumping concrete |
Country Status (2)
| Country | Link |
|---|---|
| DK (1) | DK200600716A (en) |
| WO (1) | WO2007134610A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735386A (en) * | 2019-01-30 | 2019-05-10 | 重庆富典建筑工业化制品有限公司 | A kind of lubricant for pipeline of concrete pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0593815A1 (en) * | 1992-10-23 | 1994-04-27 | Sika AG, vorm. Kaspar Winkler & Co. | Lubricating suspension for pumping concrete |
| US5997633A (en) * | 1994-07-29 | 1999-12-07 | Fritz Industries, Inc | Composition for and method of pumping concrete |
| WO2004018334A1 (en) * | 2002-08-20 | 2004-03-04 | Construction Research & Technology Gmbh | Method of lubrication of conduits for cementitious slurries |
| WO2005073556A1 (en) * | 2004-01-20 | 2005-08-11 | Prime-A-Pac, Inc. | Concrete pump primer |
-
2006
- 2006-05-24 DK DK200600716A patent/DK200600716A/en not_active Application Discontinuation
-
2007
- 2007-05-24 WO PCT/DK2007/000245 patent/WO2007134610A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0593815A1 (en) * | 1992-10-23 | 1994-04-27 | Sika AG, vorm. Kaspar Winkler & Co. | Lubricating suspension for pumping concrete |
| US5997633A (en) * | 1994-07-29 | 1999-12-07 | Fritz Industries, Inc | Composition for and method of pumping concrete |
| WO2004018334A1 (en) * | 2002-08-20 | 2004-03-04 | Construction Research & Technology Gmbh | Method of lubrication of conduits for cementitious slurries |
| WO2005073556A1 (en) * | 2004-01-20 | 2005-08-11 | Prime-A-Pac, Inc. | Concrete pump primer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735386A (en) * | 2019-01-30 | 2019-05-10 | 重庆富典建筑工业化制品有限公司 | A kind of lubricant for pipeline of concrete pump |
Also Published As
| Publication number | Publication date |
|---|---|
| DK200600716A (en) | 2007-11-25 |
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