IES20080386A2 - Concrete batching system and process - Google Patents
Concrete batching system and processInfo
- Publication number
- IES20080386A2 IES20080386A2 IE20080386A IES20080386A IES20080386A2 IE S20080386 A2 IES20080386 A2 IE S20080386A2 IE 20080386 A IE20080386 A IE 20080386A IE S20080386 A IES20080386 A IE S20080386A IE S20080386 A2 IES20080386 A2 IE S20080386A2
- Authority
- IE
- Ireland
- Prior art keywords
- aggregate
- hopper
- coarse
- concrete
- mixer
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012615 aggregate Substances 0.000 claims abstract description 94
- 238000005303 weighing Methods 0.000 claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 9
- 239000004615 ingredient Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000007792 addition Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- B28C5/003—Methods for mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0046—Storage or weighing apparatus for supplying ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0481—Plant for proportioning, supplying or batching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/002—Mixing systems, i.e. flow charts or diagrams; Making slurries; Involving methodical aspects; Involving pretreatment of ingredients; Involving packaging
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a process and system for the production of a batch of concrete in a concrete plant and delivering to a desired location, for example a truck mixer, for onward transportation. The plant comprises cement, water and aggregate weighing hoppers, the process comprising the steps of transporting weighed quantities of coarse and/or fine aggregates on a single transport conveyor belt and separating the coarse and fine aggregate using a Y-chute positioned at one end of the transport conveyor belt. The invention provides a number of advantages over the prior art, namely greater homogeneity leading to concrete of better quality. <Figure 4>
Description
The present invention relates to a concrete batching system and process enabling portable mixing of coarse aggregates with separately pre-mixed mortar (or concrete's mortar), to a homogenous state.
Background to the Invention Currently, there are two major types of batching equipment for manufacturing of concrete when considering portability. The first, more traditional type of batching equipment is known as a batching plant (also referred to as stationary). The second type of batching equipment is portable and is known as a volumetric mixer.
Current concrete batching plants can typically operate using one of the following two different methods namely: a) b) Dry Concrete Batching Systems (DCBS); and Wet Concrete Batching Systems (WCBS) At the concrete batching plants dosage of ingredients is usually measurec I by weight. In such an arrangement, the operator will select the required mix design code name in accordance with the order and the engineering specification for a particular application (concerning compressive strength class, exposure class or classes, consistence class or classes, required workability, etc).
In the DCBS system, as illustrated in Figure 1, during one batch all weighed and/or measured ingredients are discharged «0β03 together (or in sequences) into a Truck-Mixer but without prior premixing. The advantage of this method is short truck loading time.
However the main problem with this method of batching concrete is that it does not guarantee homogeneity of produced concrete. It is also very difficult to achieve good suppression of cement dust emissions. Also, delays are likely to occur if there is a need for a load to be checked by quality control technicians before leaving the production plant. Other problem with this concrete batching method is that the only type of transporting vehicle that can be used for carrying a load of concrete to construction site is the Truck-Mixer as after discharging of the concrete ingredients they need to be mixed.
In the WCBS, as illustrated in Figure 2, during one batch all weighed and/or measured ingredients are first premixed (all together in the Stationary-Mixer) prior to discharging of the ingredients into Truck-Mixer or into/onto any other Transporting/Mixing/Agitating Vehicle batching concrete usually provides uniformity of final product.
This method of high quality and The main problem with this method of batching concrete is that it is not energy and time efficient. A further disadvantage of a WCBS is that the concrete may deteriorate in transit, especially with highly aerated concrete.
Concrete plants can be made installed on trailers and mounted any place i.e. construction site. Concrete plants may also be in the regime of continuous production (continuous mixer) where a batch is not considered as a l£°80386 certain amount of concrete produced in one cycle of mixer/plant operations but is considered as quantity of concrete produced/discharged during one minute of continuous work of such plant (see EN-206-1 point 3.1.19).
With volumetric mixer concrete batching systems the materials required for the concrete mix are transported to the site in separate hoppers on a vehicle. When the concrete is required, the separate components are steadily added to a mixing apparatus (auger) , also on board the vehicle, in the appropriate proportions to provide a steady continuous supply of the required concrete mix. The concrete mix can be supplied as and when required.
There are several advantages with volumetric mixers. Firstly, if different mix designs are required at one or several different sites, the operator can vary the components of the concrete. This is normally done by altering the gate settings on the aggregate bin, while keeping the cement feed constant. Secondly, a suitable accelerator can be injected at the mixing apparatus (auger) in order to rapidly set the concrete. A third advantage is that, since the constituents of the mix are transported to the site separately, the concrete is always fresh and does not deteriorate in transit.
On the other hand, a disadvantage/problems with volumetric mixers currently available is that the quality and reliability of the concrete mix may not be very high, since the proportions of the components are dependent on the skill of the operator. For example, a gate on a particular component hopper may be set incorrectly; thereby resulting in an inappropriate mix for the particular application or lE°O0386 all the component supplies may be set too high resulting in a supply rate which is too high for the particular application. It is important as well that the dosage of ingredients by volume or time of discharge is usually less accurate than dosage by mass (weight).
There is therefore a need to provide a concrete batching system and method to overcome the above mentioned problems/disadvantages.
Summary of the Invention According to the present invention there is provided, as set out in the appended claims a process for the production of batch concrete in a concrete plant and delivering to a desired location, for example a truck mixer, for onward transportation, said plant having cement, water and aggregate weighing hoppers, the process comprising the steps of: weighing and transporting quantities of coarse and fine aggregates on a single transport conveyor belt; separating the coarse and fine aggregate using a Ychute positioned at one end of the transport conveyor belt; delivering the fine aggregate to a fine aggregate holding hopper; delivering the coarse aggregate to a coarse aggregate holding hopper; providing a cement weighing hopper and an optional water weighing hopper and a stationary hopper; pre-mixing in a stationary mixer desired quantities of fine aggregate, cement and water delivered from the fine aggregate holding hopper, cement weighing hopper ί£°80386 and water weighing hopper to provide premixed concrete mortar; discharging the premixed concrete mortar from the stationary mixer and the coarse aggregate from the coarse aggregate holding hopper to the desired location.
The present invention provides a number of advantages over the prior art, namely greater homogeneity leading to concrete of better quality. Alleviation of discharging problems is achieved as the final discharge chutes are much less likely to block due to the separation of the coarse aggregate from the other ingredients. This is very advantageous. Significant decreasing of the mixer's abrasion is achieved when compared with WCBS. The invention provides energy efficiency, as smaller mass requires less force for mixing. Increase in transport efficiency is also achieved due to shorter loading period. The invention provides better dust suppression as the volume of coarse aggregates is not pushing out dusty air from the Stationary-Mixer. In addition prevention of the Cement Weighing Hopper from airlocking is achieved as volume of materials discharged into the Stationary-Mixer is smaller, therefore pressure inside of the Stationary-Mixer during loading is decreased and thus providing greater ease of cement discharge.
Ideally the desired location is a truck mixer and the premixed concrete and the coarse aggregate are mixed to a homogenous state.
Optionally the invention provides the additional step of adding fibres to the coarse aggregate in the coarse aggregate holding hopper.
In another embodiment of the present invention there is provided a system for the production of batch concrete in a concrete plant and delivering to a desired location, for example a truck mixer, for onward transportation, said plant having cement, water and aggregate weighing hoppers, the system comprising: means for transporting weighed quantities of coarse and/or fine aggregates on a single transport conveyor belt ·, means for separating the coarse and fine aggregate using a Y-chute positioned at one end of the transport conveyor belt; means for delivering the fine aggregate to a fine aggregate holding hopper; means for delivering the coarse aggregate to a coarse aggregate holding hopper; means for providing a cement weighing hopper and an optional water weighing hopper and a stationary hopper; means for pre-mixing in a stationary mixer desired quantities of fine aggregate, cement and water delivered from the fine aggregate holding hopper, cement weighing hopper and water weighing hopper to provide premixed concrete mortar; means for discharging the premixed concrete mortar from the stationary mixer and the coarse aggregate from the coarse aggregate holding hopper to the desired location.
There is also provided a computer program comprising program instructions for causing a computer program to ΙΕ0β0 386 carry out the above method which may be embodied on a record medium, carrier signal or read-only memory.
Brief Description of the Drawings The invention will be more clearly understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings, in which:- Figure 1 is a workflow diagram of a dry concrete batching system; Figure 2 is a workflow diagram of a wet concrete batching system; Figure 3 is a workflow diagram according to the present invention; and Figure 4 illustrates an exemplary view of the stationary concrete mixer based plant and system of the present invention.
Detailed Description of the Drawings Referring to Figure 3 there is illustrated a workflow diagram of the present invention indicated generally by the reference numeral 1.
Figure 4 shows cement and water and fine aggregate weighing hoppers 2, 3, 4 coupled to a stationary mixer 5. In addition separately coupled to the stationary mixer 5 is fine aggregate holding hopper 4 where the main weighing process is realised on the weighing belt. On it firstly a fine aggregate should be dosed and secondly (after discharging of fines into the fine holding hopper) a coarse aggregate is weighed and transported to the coarse holding hopper. Both of the holding hoppers can be equipped with weighing cells to ensure that all material which has been weighed on the belt has been transported into holding hopper and also in the next step of the batch sequence to ensure that all the material from the holding hopper has been fully discharged to the final destination (Truck-Mixer or Stationary-Mixer). Coarse aggregate bin hopper 7 is separately connected through the aggregate weighing belt to the coarse aggregate holding hopper 8, which is in communication with the Truck-Mixer 6 through the final discharge chute.
Fine aggregate bin hopper 13 is connected through the aggregate weighing belt to the fine aggregate holding hopper 4 wherefrom fine aggregate is introduced into the Stationary-Mixer 5.
Concrete-mortar can be made by pre-mixing in the Stationary-Mixer 5 desired quantities of the ingredients delivered from the fine aggregate holding hopper 4 and from the cement and water weighing hoppers 2 and 3. It will be appreciated that the separation of ingredients allows quicker turnaround for mixing and loading times, while saving energy.
Pre-mixing in the stationary mixer 5 can include the following ingredients, fine aggregate, cements, bulk powder additions, admixtures and other desired ingredients which have impact on the properties of the ready mixed concrete in any desired combination (either in a fresh or hardened state or both).
It will be appreciated that the required quantity of coarse aggregate is kept separate from the fine aggregate as discussed in detail below as the coarse aggregate is 90S not pre-mixed in the stationary mixer 5. Control of the work flow diagram can be implemented by control of computers and associated controller software.
In operation the process of the present invention is illustrated by Figure 4 and generally indicated by the reference numeral 20. A single conveyor weighing belt 21 is provided to dose by weight and transport the required quantities of the coarse and/or fine aggregate to the selected holding hopper. A Y-chute 22 is provided at one end of the transport conveyor belt 21. Weighing of the aggregate ingredients starts with fine aggregate (for efficiency reasons). After the total quantity has been weighed up, the fine aggregate is transported into the fine aggregate holding hopper 4. The fine aggregate is discharged into the Stationary Mixer 5 for slurry mixing (with the rest of the concrete-mortar ingredients) which is followed by its discharge into a Truck-Mixer (not shown) through final discharge chute 23. Optionally, if no coarse aggregate is required the mixed fine aggregate can be separately discharged though discharge chute 24 to a desired location.
After the fine aggregate has been discharged from the aggregate weighing belt 21, coarse aggregate is weighed on the weighing belt 21 and transported into the coarse aggregate holding hopper 8, wherefrom it is discharged through the final discharge chute 23 into the Truck-Mixer thereby bypassing the Stationary-Mixer 5.
Simultaneously, to the process of weighing of the aggregates the weighing of the other ingredients is started. Cement and bulk powder additions are weighed in ΙΕΰ 80 3 cement weighing hopper wherefrom they are introduced into the stationary mixer 5.
It should be appreciated that the stationary mixer 5 premixes desired quantities of fine aggregate, cement and water delivered on the fine aggregate holding hopper, cement weighing hopper and water weighing hopper to provide pre-mixed concrete mortar. The water can be dosed by a number of means, e.g. weighed in the water-weighing hopper, wherefrom it is discharged into the stationary mixer 5. Another method is to use volume dosage by measuring the amount of water introduced into the Stationary-Mixer. The same applies to the admixtures (and any other liquids) which can be introduced to by mass or volume depending on the ingredients and technology/method used.
Discharging of the pre-mixed concrete-mortar from the Stationary-Mixer 5 and the coarse aggregate from the coarse aggregate holding hopper 8 are controlled by an operator or a computer program or a combination of both. The desired location is typically a Truck-Mixer, inside its drum the pre-mixed concrete's-mortar and the coarse aggregate can be mixed off site to a homogonous state.
Different kinds of fibres can be added directly to the conveyor system and preferably with the coarse aggregate.
The inventive Y-Chute 22 is a mechanism designed to distribute into two (or more) separate destinations any suitable materials delivered to it. It will be appreciated that the Y-Chute 22 can be replaced by any other distribution mechanism that distributes deliverable £θ 8 0 3 materials to separate locations such as belt with reverse motion or belt that can be moved. It was found that usage of one single belt for transporting aggregates (or any other ingredients) in combination with the Y-Chute 22 and more than one Holding/Weighing Hoppers assembled provided the best and most advantageous embodiment for the present invention, in combination with proper sequencing set up in a process controlling computer provided, or any other automatic or manual methods/procedures for the controlling of the present invention.
It will be appreciated that the current invention may be also realised by setting two (or more) separate weighing and transporting systems of belts (or any other conveyers and optional holding hoppers) for coarse and fine aggregates.
It will be appreciated that the Stationary-Mixer working in the regime of present invention may have less capacity than conventional Stationary-Mixer with no negative effects on the plant's production capacity.
The embodiments in the invention described with reference to the drawings comprise a computer apparatus and/or processes performed in a computer apparatus. However, the invention also extends to computer programs, particularly computer programs stored on or in a carrier adapted to bring the invention into practice to control the process according to the appended claims. The program may be in the form of source code, object code, or a code intermediate source and object code, such as in partially compiled form or in any other form suitable for use in the implementation of the method according to the invention. The carrier may comprise a storage medium such as ROM, e.g. CD ROM, or te690366 magnetic recording medium, e.g. a floppy disk or hard disk.
The carrier may be an electrical or optical signal which may be transmitted via an electrical or an optical cable or by radio or other means.
The words comprises/comprising and the words having/including when used herein with reference to the present invention are used to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination.
The invention is not limited to the embodiments hereinbefore described but may be varied in both construction and detail. ,ε°Ο0386
Claims (5)
1. A process for the production of batch concrete in a concrete plant and delivering to a desired location, for example a truck mixer, for onward transportation, said plant having cement, water and aggregate weighing hoppers, the process comprising the steps of: transporting weighed quantities of coarse and/or fine aggregates on a single transport conveyor belt; separating the coarse and fine aggregate using a Ychute positioned at one end of the transport conveyor belt; delivering the fine aggregate to a fine aggregate holding hopper; delivering the coarse aggregate to a coarse aggregate holding hopper; providing a cement weighing hopper and an optional water weighing hopper and a stationary hopper; pre-mixing in a stationary mixer desired quantities of fine aggregate, cement and water delivered from the fine aggregate holding hopper, cement weighing hopper and water weighing hopper to provide premixed concrete mortar; discharging the premixed concrete mortar from the stationary mixer and the coarse aggregate from the coarse aggregate holding hopper to the desired location.
2. The process of claim 1 wherein the desired location is a truck mixer and the pre-mixed concrete and the coarse aggregate are mixed to a homogenous state. ¢0 8 03 gQ Μ
3. The process of any preceding claim comprising the additional step of adding fibres to the coarse aggregate in the coarse aggregate holding hopper.
4. A system for the production of batch concrete in a concrete plant and delivering to a desired location, for example a truck mixer, for onward transportation, said plant having cement, water and aggregate weighing hoppers, the system comprising: means for transporting weighed quantities of coarse and/or fine aggregates on a single transport conveyor belt; means for separating the coarse and fine aggregate using a Y-chute positioned at one end of the transport conveyor belt; means for delivering the fine aggregate to a fine aggregate holding hopper; means for delivering the coarse aggregate to a coarse aggregate holding hopper; means for providing a cement weighing hopper and an optional water weighing hopper and a stationary hopper; means for pre-mixing in a stationary mixer desired quantities of fine aggregate, cement and water delivered from the fine aggregate holding hopper, cement weighing hopper and water weighing hopper to provide premixed concrete mortar; means for discharging the premixed concrete mortar from the stationary mixer and the coarse aggregate from the coarse aggregate holding hopper to the desired location. IE °903 86
5. A system or process as substantially hereinbefore described with reference to the accompanying description and/or Figures 3 and 4. 1/4 8 °3 β β 2/4 3/4 Coarse Coarse Aggregate Aggregate Bins Weighing Hopper
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20080386A IES20080386A2 (en) | 2008-05-15 | 2008-05-15 | Concrete batching system and process |
| IE20090372A IE20090372A1 (en) | 2008-05-15 | 2009-05-13 | Concrete batching system and process |
| GB0908213A GB2459974A (en) | 2008-05-15 | 2009-05-13 | Concrete batching system and process with y-chute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20080386A IES20080386A2 (en) | 2008-05-15 | 2008-05-15 | Concrete batching system and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IES20080386A2 true IES20080386A2 (en) | 2009-01-21 |
Family
ID=40262765
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE20080386A IES20080386A2 (en) | 2008-05-15 | 2008-05-15 | Concrete batching system and process |
| IE20090372A IE20090372A1 (en) | 2008-05-15 | 2009-05-13 | Concrete batching system and process |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE20090372A IE20090372A1 (en) | 2008-05-15 | 2009-05-13 | Concrete batching system and process |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2459974A (en) |
| IE (2) | IES20080386A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201693681U (en) * | 2010-06-12 | 2011-01-05 | 三一重工股份有限公司 | Concrete mixing plant |
| IT202000014320A1 (en) * | 2020-06-16 | 2021-12-16 | Simem S P A | PLANT FOR CONVEYING MATERIAL FOR THE PRODUCTION OF STRUCTURAL CONCRETE AND PROCEDURE |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583804B2 (en) * | 1980-07-12 | 1983-01-22 | 大平洋金属株式会社 | Concrete manufacturing method using a laminated pan type mixer |
| US4795263A (en) * | 1985-02-13 | 1989-01-03 | Sumitomo Corporation | Method of producing concrete |
| AU5369196A (en) * | 1995-03-14 | 1996-10-02 | Melvin L. Black | Method and apparatus for mixing concrete |
| JP4106127B2 (en) * | 1998-06-25 | 2008-06-25 | 日工株式会社 | Ready-mixed concrete production plant |
| JP4877624B2 (en) * | 2005-08-18 | 2012-02-15 | 光洋機械産業株式会社 | Aggregate receiving and supplying method and apparatus |
-
2008
- 2008-05-15 IE IE20080386A patent/IES20080386A2/en not_active IP Right Cessation
-
2009
- 2009-05-13 GB GB0908213A patent/GB2459974A/en not_active Withdrawn
- 2009-05-13 IE IE20090372A patent/IE20090372A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IE20090372A1 (en) | 2009-11-25 |
| GB2459974A (en) | 2009-11-18 |
| GB0908213D0 (en) | 2009-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed |