SE1550080A1 - Grout preparation and administration - Google Patents

Description

10 15 20 25 30 2 mixers may be used that all supply their prepared grout mix to one or more associated agi- tators and all mixers and agitators must be equipped With their own semi-automatic control system controlling preparation of grout mix of a specific batch.

SUMMARY It is a general object of the present technology to provide an improved solution to the above discussed problems and shortcomings of conventional grout mix preparation and admini- stration in association with rock/soil grouting.

In particular it is an object of the technology to suggest an improved method of preparing and administering grout mix for injection into multiple or large diameter boreholes in rock or soil.

It is another object of the technology to suggest an improved apparatus for preparing and administering grout mix for injection into multiple or large diameter boreholes in rock or soil.

These and other objects are met by the technology as defined by the accompanying claims.

The technology generally relates to grouting, namely the injection of cementitious and/or non- cementitious grouts into an open end of injection and sealing pipes introduced into pre-drilled boreholes formed in rock/soil. Grout is prepared at site and is prepared and administered into the boreholes in a quantity required by the circumstances.

In a first aspect of the technology, there is provided an improved method of preparing and administering grout for injection into multiple or large diameter boreholes formed in rock/soil Whereby a batch of grout having a predetermined composition is prepared by controlled addition of predetermined quantities of ingredients from a respective supply to several mixers for mixing therein. A prepared grout quantity is detected by positive Weighing of the grout prepared in a mixer and prepared grout is fed to an agitator from Which grout is pumped on demand to injection equipment for injection into boreholes. In a basic configuration the output of grout from the agitator and thereby of grout supplied to the injection equipment is continuously detected by negative Weighing, i.e. Weighing of remaining grout in the agitator.

This enables calculation of a mass ?oW rate, e.g. the amount of grout withdrawn from the agitator in a given time and thereby of the required total mixer capacity for a specific batch. 10 15 20 25 30 3 According to another aspect of the technology there is provided an improved apparatus for preparing and administering grout for injection into multiple or large diameter boreholes in rock/soil and including respective supplies for grout ingredients, several rnixers for mixing the grout ingredients therein and a load cell for positive Weighing associated with each mixer.

An agitator is also provided to Which the prepared grout is fed and from Which grout is then pumped on demand to injection equipment for injection into the boreholes. In a basic configuration of the apparatus load cells for negative Weighing are associated With the agitator. A control system is also provided for individually controlling and logging the grout preparation in each of the mixers and for administration of the prepared grout to the agitator in amounts based on a Withdrawal of grout from the agitator, as calculated from the negative Weighing of the amount of grout Withdrawn from the agitator.

Preferred further developments of the basic inventive idea as well as embodiments thereof are speci?ed in the dependent subclaims.

Advantages offered by the present invention, in addition to those described above, will be appreciated upon reading the below detailed description of embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention and its further objects and advantages will be best understood by reference to the following description taken together with the accompanying drawings, in which: Fig. l is an illustration of a prior art apparatus for grout preparation and administration and a variation thereof; Fig. 2 is a schematic illustration of a an apparatus for grout preparation and administration in accordance with the present technology; Fig. 3 is a schematical diagram of a grout preparation and administration control unit of the present technology; and Fig. 4 is a schematic ?ow diagram of a grout preparation and administration control method according to the present technology. 10 15 20 25 30 DET AILED DESCRIPTION The present technology will be explained below with reference to exemplifying elnbodiments of a method of preparing and administering grout for injection into boreholes in rock/soil and an apparatus for preparing and administering such grout. The discussed and shown embodi- ments relate to an application of the technology in particular to the injection of cementitious grout into multiple injection pipes, such as by tunnelling work. The present technology may be applied generally in the field of grouting and it is emphasized that all employed equipment and components that are well known within this field are therefore not illustrated in detail in the attached drawing figures. The described technology is equally well suited for application to other types of environments and for other specific types of grouting work. T hus, the drawings are included for the sole purpose of describing preferred embodiments of the present technology and are not intended to limit the technology to details or to any specific field of application. It shall be realized that the diselosure covers the incorporation of features related to other applications and any combination of features disclosed herein. ln Fig. 1 is depícted an example of a partially and schematically outlined conventional grout preparation and administration systern/apparatus 100 With the above mentioned, presently used type of mixer 106A and agitator 107 combination. Specifically, Fig. 1 shows in full lines a basic prior art apparatus 100 that is controlled (control units 120A, 120B) in a semi-automatic manner and that has one mixer 106A supplying grout to two agitators 107. Of these agitators 107 one serves as a buffer for prepared grout and does therefore in continuous operation not add to the capacity of the system. In such a system ingredients, such as water, additives and cement are sequentially fed from respective supplies 104, 102, 103 and 105 to the mixer 106A in quantities prescribed by the composition of the prepared batch and controlled by appropriate valves 113, 114, 115 and 117. The conforrnance of the prepared grout to the composition is controlled by positive weighing (load cells 112) of the additive supply/supplies in combination with positive weighing (load cells 110) of the mixer during and after supply and preparation. The known systems use positive weighing (load cells ll 1) of the/each agitator 107, but the only purpose of this weighing is to determine how much prepared grout is available to the systems. The systems further employ magnetic inductive ?ow meters 118 to determine flow of prepared grout from the agitators, and thereby to determine the continuous grout consumption. In the long run such a detection provides insuf?cient accuracy for the operation control since the valves will inevitably become fouled after some time in operation. Such fouling will have the effect that the detected 10 15 20 25 30 5 delivered grout quantity is higher than the actual amount. The described system relies to a sig- ni?cant part on manual input, such as a manual start of each batch or series of batches, a manual choice of which agitator 107 to supply with prepared grout and a manual input of the ingre- dients having been added to determine the sum of the pumped grout. The conventional system is therefore very exposed to malfunctions due to human errors.

One further, specific problem has been noted by the supply of ingredients to the mixer, namely that the system does not preclude tampering with the logged quantities of used ingredients, especially the expensive additives, in the batch being prepared. Another less desirable reality in prior art systems is that the single mixer l06A normally needs to have a large grout preparation capacity to provide a required amount of grout to injection equipment 108 for a speci?c appli- cation. In addition to the initially mentioned extra preparation time for each batch and the problem of large amounts of unused grout mix, an operator must also manually switch bet- ween the agitators 107.

In attempts to increase the capacity of such conventional systems without further increasing the size of the mixer it is known to duplicate the described system by providing two separate mixers l06A, 106B each supplying prepared grout to two designated agitators 107. Such a further developed system is indicated with dash-dot lines in Fig. 1 and uses two separate con- trol units l20A, l20B, each controlling preparation of one grout composition batch for the de- signated mixer lO6A, 106B, with no interaction there between. Thus, each mixer and control unit must completely finish the composition before the next batch or composition preparation may be started manually. For the large number of parts employed in this system it requires con- siderable manual input from at least 2-4 operators. Still it has a very limited grout capacity.

To overcome the above described disadvantages and problems associated with the known methods and systems, the present technology suggests a novel approach for the control and performance of a grout preparation and administration method and system intended for use in rock/soil grouting operations. The suggested grout preparation and administration approach brie?y involves providing a secure control of the grout preparation and mixing by combining positive and negative weighing performed in series for one and the same grout composition and by using several mixers controlled interactively and feeding one agitator. This will enable the efficient, practical use of the system and thereby the preparation and supply of a signi?cantly 10 15 20 25 30 6 increased quantity of grout, all with the use of only one operator. At the same time the proposed improvement will provide very accurate and tamper-free logging and control of the quantities of the used additive ingredients. By allowing thorough control of the number of grout batches that the system requires per minute and thereby minimization of waste, the environmental effect will further be very advantageous. The versatility of the system as regards the change of grout com- position will also be greatly improved compared to existing solutions.

The proposed new technology for preparation and administration of grout for injection into mul- tiple or large diameter bore-holes formed in rock/soil will ?rst be explained with reference to an exemplifying apparatus 1 illustrated in Fig. 2. The apparatus 1 is intended for the preparation and administration of grout G and includes respective level-controlled supplies 2-5 of grout ingredi- ents that for a cementitious grout may comprise water, cement and additives. Reference numbers 2 and 3 represent Supplies, norrnally tanks, for additives, 4 represents a water supply and 5 represents a cement supply that is normally named a bin. Separate ?ow control valves, 15, 17 and 13, 14 are associated with each water, cement and additive supply, and through said valves water, cement and additives are separately supplied to each mixer from the respective supplies 2-5. A hydraulic valve and motor (not shown) are activated to convey cement from the cement bin 5 via an ordinary screw feeder (not speci?cally denoted) and to a inanifold 16 distributing the cement to the valve 17 associated With the respective mixer 6A-6N. The flow control valves 15, 17, 13, 14 for the water, cement and additive supplies are preferably pneumatically or electrically (magnetic spool) controlled. Two or more mixers 6A-6N are provided for mixing the grout G ingredients therein and the number of mixers may in this case be varied freely within reasonable numbers, such as based on required capacity and/or available space.

This means that each mixer 6A-6N may have a considerably reduced size, enabling a great amount of versatility as regards the ability to shorten the lead time for each batch and the possi- bility to quickly change grout composition/forrnulation. ln practical examples that shall by no means delimit the technology, the mixers may be provided in a cluster con?gured in pairs or in sets of four or even six mixers each having a size of approximately 100 liters, The system further includes a single agitator 7 to which prepared grout G is fed through valves (not speci?cally de- noted) from selected mixers 6A-6N and from which grout is then purnped on demand to injection equipment 8 for injection into the boreholes (not speci?eally shown). For the pumping of grout G 10 15 20 25 30 7 from the agitator 7 is employed a grout pump of any appropriate, not speci?cally named type that is able to provide an even flow of grout to the injection equipment S.

Conventional load cells 10 for positive weighing are associated With each mixer 6A-6N and serve to provide control of the supplied water and cement quantities and a value of the total weight of the prepared grout mix supplied to the agitator 7. A load cell 12 for negative weighing is associ- ated with each additive supply 2, 3 in order to enable accurate control of the additive supply to the mixers 6A-6N. The quantities of additives for each batch are very small and the negative weigh~ ing of withdrawn quantities will provide a very accurate result. Further load cells 11 for negative weighing are associated With the agitator 7. A control unit 20 is provided for individually but interactively controlling and logging the grout preparation in each of the mixers 6A, 6N and for administration of the prepared grout G to the agitator 7 in amounts based on a Withdrawal of grout G from the agitator 7. A mass ?ow of grout from the agitator 7 per unit of time is calculated from the continuous negative weighing of the amount of grout Withdrawn from the agitator.

F ig. 3 illustrates very schematically the basic components and functions of an exemplary control unit 20 being common to all mixers 6A-6N and serving to control the grout preparation apparatuis 1. The common control unit 20 separately controls the supply of ingredients of a selected grout coinposition to one or several mixers 6A-6N, as required. It further controls the mixing operation for and Withdrawal of grout G from all active mixers 6A-6N in accordance with the selected compositions and based on input values from load Sensors 10, 11, 12, supply valves 13, 14, 15, 17 and the below described, calculated grout consumption based on Withdrawal of grout G from the agitator 7. This control unit 20 provides an automatic process function by enabling control of all mixers of the apparatus 1, which means that as soon as the ?ow of grout G from the agitator is greater than that supplied by one mixer 6A alone, ?irther mixers 6B-6N are activated as required.

Thus, in the apparatus 1 according to this technology a number of individually but interactively controlled mixers 6A-6N are provided and the number of activated mixers depends upon the grout quantity required by the injection equipment 8. This quantity is represented by the mass ?ow rate of grout G as calculated from the result of the continuous negative weighing of the agitator 7.

For providing the described functions the common control unit 20 may basically include a sensor input evaluation means 21 receiving the detected values from all load cells 10, 11, and 12. Load cell input values are then entered into a sensor input computing means 22 by which is also made a 10 15 20 25 30 8 manual input 19 of a selection of grout composition or fonnulation. A process timer 24 is also connected to the sensor input computing means 22 to provide the time data for calculating the mass flow rate of grout from the agitator 7 based on the negative Weighing. The computing means 22 is further connected to means 23 for controlling the activation of the supply of ingredients to the mixers 6A-6N as well as the activation of impellers (not speci?cally shown) of the mixers. An override function may also be provided at the control unit 20 for allowing the operator to make a manual mixer selection input 18.

It will be readily appreciated that the technology also concerns a method of preparing and ad- ministering grout for injection into multiple or large diameter boreholes preformed in rock or soil. Thereby a batch of grout G having a predetermined composition is prepared in a con- ventional manner by controlled addition of predetermined quantities of ingredients, such as water, cement and additives, from a respective supply 2-5 to two or more mixers 6A-6N for mixing therein, A grout quantity prepared in the mixer/-s is basically detected by positive weíghing of the grout G prepared. Prepared grout G is then fed to an agitator 7 from Which grout is pumped on demand to the injection equipment 8 for injection into boreholes. In particular, with specific reference to Fig. 4, the method includes the below described steps.

In a ?rst step Sl the grout preparation is started by supplying water pumped from the Water supply 4 to one of the mixers 6A-6N and in a quantity as prescribed in the selected compo- sition. This supply of Water is controlled by positive weíghing of the mixer in step S2, so that the Water valve 13 eloses When the mixer load cells 10 detect a preset weight for the specific grout composition being prepared. Then, in step S3, additives in quantities as prescribed in the composition are supplied from the respective additive supply 2, 3, through the designated valves 14, 15 and to the mixer. Specifically, the output quantity of one or more additives from associated additive Supplies 2, 3 and thereby of the additive supplied to each mixer 6A-6N is continuously detected by negative weíghing of remaining additive in the supplies/tanks during grout preparation. This supply of additives being controlled by negative weíghing is per- formed in step S4, so that when the weight of additive in the respective supply 2, 3 has de- creased by a preset weight the corresponding additive valve 14, 15 closes. The additive tanks are pressurized and the Weight of supplied additives is calculated by the loss of weight therein, as measured With the negative weíghing of the quantity withdrawn from the additive Supplies. 10 15 20 25 30 9 In step S5 the impeller of the mixer is started in order to create a vortex therein preventing that a lump is formed when cement is then supplied to the mixer in step S6. The supply of cement to the mixer is started by the control unit 20 that activates a valve and motor causing a feed screw to convey cement from the bin 5 to the distributor 16 and from there to the mixer, through the cement supply valve 17. Mixing is now performed for a prescribed time, such as for 30 seconds, in step S7. As the control unit 20 detects that preparation of grout G in a mixer is completed the mixer weight is determined by the positive weighing of the mixer The grout quantity that is ready to be fed to the agitator 7 is calculated by deducting from the detected positive weight a weight of residual grout mix remaining on the walls of the mixer.

At the same instant prepared grout from the mixer 6A is fed to the agitator 7. Since the Weight of grout remaining in the agitator 7 has been checked in step S8 by negative weighing, the total quantity of grout available in the agitator 7 is determined by adding the calculated weight of grout fed from the mixer to said weight detected by the negative weighing. The calcu- lations are being made instantaneously so that there is no need to pause the mixer or agitator before or during the feeding of grout to the agitator. ln case the detection in step S9 indicates that the weight of the agitator 7 is too high the mixer 6A-6N is put on hold in step S10 and no pumping of grout G to the agitator 7 is started. If, on the other hand the value of the agitator weight detected in step S11 is too low the control system sends a signal to the appropriate valve for conveying prepared grout G to the agitator 7 in step S12. In step S13 the control unit adds the detected weight of grout removed from the mixer 6A-6N to the weight of the agitator 7. While grout G is being pumped from the agitator 7 as requested by the grouting equipment 8 the weight of the agitator 7 is continuously detected by negative weighing of the agitator in step S15. By this continuous negative weighing, i.e. weighing of remaining grout in the agitator, the output quantity of grout from the agitator and thereby of the grout supplied to the injection equipment is detected. Based on the result of the negative weighing by the agitator load cells 11 and set in relation to time a mass ?ow rate of the grout leaving the agitator may be calculated in step S16. Expressed otherwise the combined positive weighing of the mixer and negative weighing of the agitator enables calculation of the mass flow rate, e.g. the amount of grout withdrawn from the agitator in a given time and thereby of the required total mixer capacity for a speci?c batch. In the event that the required mass ?ow rate exceeds what may be prepared by one mixer 6A, that is the time required for one mixer to complete the preparation of one batch, the system 10 15 20 25 30 10 may order the activatíon, in step 17, of another one of the mixers 6B-6N to prepare grout With the same composition. With the present technology this activation of a required ?irther mixer or further mixers is carried out fully automatic by the control unit 20.

In summary, in the described application, by detecting the positive Weight of grout supplied from the mixer 6A it is likewise established What quantity Was supplied to the agitator 7. By also detecting, through the negative weighing, the quantity that has been WithdraWn from the agitator 7, during pausing of the inixing, the average mass ?ow rate may be calculated. In the present method the weighing in the form of negative weighing at the agitator 7 is thereby part of the batch system as a ?ow control. From the above discussion it should be clear that the calculated ?oW of prepared grout G from the agitator 7 is used to determine When further mixers 6A-6N, in addition to a first one, must be activated for grout preparation. Thus, mixing grout G of the same composition may be performed in a number of mixers 6A-6N that are individually but interactively controlled by the common control unit 20. To these mixers is separately supplied Water, cement and additives from a common supply 2-5, through separate ?ow control valves 13, 14, 15, 17, and the number of activated mixers depends upon the quantity of prepared grout G required by the injection equipment 8. If the grout quantity re- quested by the grouting is reduced the mixers that do not have to be active stop in the phase after the supply of Water. In this phase the mixers Will start for approximately 3 seconds every 5 minutes to rinse down cement having become stuck on the edges and to maintain said cement active/alive. When the grout requirement increases again the supply of additives and cement etc. Will simply be continued to the now required, previously stopped mixer or mixers.

In this apparatus 1 there is only one control unit 20 having several load cells, depending upon the number of mixers employed. The load cells are all Working in series for one and the same grout composition, One load cell each is used for ?ow control and for additive weighing. This means that all load cells may Work simultaneously and due to a use of several smaller mixers the lead time for each batch may be shortened., Mixing of 100 liters Will require a mixing time of about 30 seconds and if the quantity is increased to 200 liters the mixing time Will With a conventional system be 60 seconds and so forth. If, in a practical example of this de- scribed technology, it Will take 37 seconds to prepare one grout composition, the use of e.g. six smaller mixers in the proposed configuration Will make it possible to prepare six grout compositions in the same 37 seconds. This gives a theoretical value of 516 liters per minute. 10 15 20 25 30 ll In practical operation the number of mixers being active Will be controlled depending upon the mass ?ow rate, in other words upon the quantity of grout being pumped out from the agitator. Thus, the grout preparation capacity is controlled by the output from the agitator.

The control unit 20 uses a completely new approach based on the idea that the possibility to provide ?ow control is created by mixing positive and negative Weighíng. Such ?ow control involves the negative Weighing of every prepared grout mix and a calculation of over time to obtain a mass ?ow rate. Weighing of the batches mixed in each mixer is performed positively in order to control the consumption of the ingredient materials. This provides a double control of how much grout there is in the agitator that by its load cells governs the ?ow control. By using this way of controlling how many mixers that must be active it will be possible with this process to control how many batches per minute the grouting system requires. This does in turn provide further advantages from an environmental point of view since there will be less material waste.

In addition to those advantages offered by the present technology that have been speci?cally mentioned above, may be emphasized that: the configuration of the apparatus and the control functions of the method will make it possible to manually change the grout composition during the process, such as when grout injection into the rock is too quick, requiring a modification of the composition; - in applications consuming large amounts of grout the mixers are operated sequentially in a number corresponding to the actual grout consumption as calculated from the result of the actual amount of grout Withdrawn from the agitator; - all mixers in a cluster are controlled in series by the same grout composition as set in the control unit; - larger security margin through reduction of the effect of human errors; - the technology is economically advantageous for contractor and entrepreneur since the actual consumption is invoiced; - the proposed technology permits faster grout injection in rock and by tunnelling Work using fewer operators and with smaller impact on the environment. In particular the proposed apparatus and method makes it possible to inject into large diameter boreholes or multiple boreholes at the same time, with the mentioned reduced personnel; and - energy consumption to operate the equipment will be reduced. 10 15 20 25 30 12 Logging must be performed on all systems within this area to secure that the contractor and the entrepreneur may be in agreement of the actual consumption of materials. In the proposed technology the size of the composition is known and is entered as a positive factor in the negative Weighing of the ?ow and can therefore not be manipulated in any sense. Each batch added to the mass ?ow detection is also logged in the system by the proper material type. This in turn means that this technology does not require a separate flow meter or separate logging instruments. The equipment may advantageously be operated by one single person since it will be fully automatic, but other restrictions may demand two persons working together, such as by tunnelling work. The apparatus will also be adapted for remote control, which means that an operator starting the grout composition may also perform manual pumping Work, such as the handling of hoses. Changing of the composition being prepared is performed without Stopping the preparation and thereby contributes greatly to avoiding spillage and unnecessary time loss. In practice the change of composition requires only two push-button maneuvers, selecting a preset composition number and pushing enter. This changes the composition for all mixers without delay. It is to a large extent this automation and the increased capacity that makes it possible to pump grout to multiple or large diameter boreholes and to lower the lead times for rock injection and tunnelling as requested.

In alternative, but not specifically illustrated embodiments of the technology Variations of the different illustrated parts of the apparatus may be employed without departing from the scope of the invention. An example of this is the use of varying numbers of mixers in a cluster controlled in series by the control unit. Likewise, Varying types of containers and tanks and various types of supply control valves, motors and pumps may be used for the supply of ingredients of the grout mix and of prepared grout. It shall also be emphasized that although the invention has been described and illustrated with specific reference to an application for use with cementitious grout in connection With grouting for tunnelling operations, the invention is in no way restricted to such applications. The basic principles of the invention may be applied to other similar operations and processes.

The present technology has been described in connection with embodiments that are to be regarded as illustrative examples thereof. It Will be understood by those skilled in the art that the present technology is not limited to the disclosed embodiments but is intended to cover 13 various modi?cations and equivalent arrangernents. The present technology likewise covers any feasible combination of features described and illustrated herein. The scope of the present technology is de?ned by the appended claims.

Claims (13)

PATENTKRAV 1. Metod for beredning och administrering av injekteringsbruk (G) for injektering i ett flertal bound' eller borrhdl med stor diameter formade i berg/mark, varvid en sats av injekterings- bruk med en vald sammansdttning bereds genom kontrollerad tillsattning av forutbestamda kvantiteter av ingredienser, sasom vatten, cement och tillsatser fran ett resp. forrad (2-5), till tva eller flera blandare (6A-6N) for blandning dari, en beredd kvantitet av injekteringsbruk detekteras genom positiv vagning av det injekteringsbruk som beretts i en blandare och berett injekteringsbruk matas till en agitator (7) fran vilken injekteringsbruk darefter vid behov pumpas till injekteringsutrustning (8) for injektering i borrhal, kannetecknad av:

1. kontinuerlig detektering av uttagen kvantitet av injekteringsbruk fran agitatorn och darigenom av det injekteringsbruk som tillforts injekteringsutrustningen genom negativ vagning, dvs. vagning av kvarvarande injekteringsbruk i agitatorn; varigenom 2. berdkning mojliggors av ett massflOde, dvs. den mangd av injekteringsbruk som uttas frail agitatorn under en given tid, och darigenom av den erforderliga totala blandar- kapaciteten for en specifik sats.

2. Metod enligt krav 1, kannetecknad av att injekteringsbruk (G) med samma sammansattning blandas i ett antal av individuellt reglerade blandare (6A-6N), varvid antalet är bero- ende av den kvantitet som erfordras av injekteringsutrustningen (8), till vilka vatten, cement och tillsatser tillfors separat fran ett gemensamt forrad (2-5) genom separata flodesregleringsventiler (13, 14, 15, 17).

3. Metod enligt krav 1 eller 2, kannetecknad av att kontinuerligt under beredning av in- jekteringsbruk (G) detekteras den uttagna kvantiteten av en eller flera tillsatser fran till- horande forrhd (2, 3) av tillsatser och darigenom av de tillsatser som tillforts varje blandare (6A-6N) genom negativ vagning av kvarvarande tillsats i namnda behallare.

4. Metod enligt nagot eller ndgra av krav 1-3, kannetecknad av att det beraknade mass- flodet av berett injekteringsbruk (G) fran agitatorn (7) utnyttj as for bestamning av nar en eller flera ytterligare blandare (6A-6N), utover den forsta, maste aktiveras for beredning av injekteringsbruk. 2

5. Metod enligt nagot eller nagra av krav 1-4, kannetecknad av att baserat pa den positiva och negativa vagningen av ingredienser och pa den negativa vagningen av den uttagna kvantiteten av injekteringsbruk fran agitatorn (7), astadkoms en manipuleringssdker kontroll och registrering av de forbrukade kvantitetema av de olika ingredienserna.

6. Metod enligt nagot eller nagra av krav 1-5, kannetecknad av att vatten matas fran ett vattenforrad (4) till en blandare (6A-6N) i en kvantitet som foreskrivs i sammansattningen och som mats med den positiva matningen av blandaren, tillsatser sedan matas till blandaren i en kvantitet som foreskrivs i sammansdttningen och som mats med den negativa matningen av kvantiteten som uttas frail tillsatsforrad (2, 3), blandaren startas, cement matas till blandaren fran ett cementforrad (5) och blandaren kors under en faststdlld tid av t.ex. 30 sekunder.

7. Metod enligt nagot eller nagra av krav 1-6, kannetecknad av att ndr beredningen av injekteringsbruk (G) i en blandare (6A-6N) är avslutad fasts-tails blandarens vikt genom posi- tiv vagning av blandaren, att en kvantitet av injekteringsbruk som är fdrdig fOr matning till agitatorn (7) berdknas och att detta beredda injekteringsbruk frail blandaren matas till agitatorn, varigenom den totala kvantiteten av injekteringsbruk som star till forfogande i agitatorn faststalls genom att addera denna berdknade vikt av injekteringsbruk fran blandaren till namnda vikt som detekterats genom den negativa vagningen.

8. Metod enligt nagot eller nagra av krav 1-7, kannetecknad av att i applikationer som forbrukar stora mdngder av injekteringsbruk (G) kors blandarna (6A-6N) sekventiellt i ett antal som svarar mot den verkliga forbrukningen av injekteringsbruk, sasom den beraknats utifran resultatet av faktiskt massflode av injekteringsbruk som uttas fran agitatorn.

9. Anordning (1) for beredning och administrering av injekteringsbruk (G) for injektering i ett flertal borrhal eller borrhal med stor diameter formade i berg/mark och omfattande resp. forrad (2-5) av ingredienser i injekteringsbruk, sasom vatten, cement och tillsatser, tva eller flera blandare (6A-6N) for blandning av injekteringsbrukets ingredienser clan, en lastcell (10) for positiv vdgning associerad med varje blandare och en agitator (7) till vilken det beredda injekteringsbruket matas och fran vilken injekteringsbruk darefter pumpas efter behov till injekteringsutrustning (8) for injektering i borrhalen, kannetecknad av: - lastceller (11) for negativ vagning, vilka dr associerade med agitatorn; och 3 - ett reglersystem (20) for individuell kontroll och loggning av beredningen av inj ekteringsbruk i var och en av blandarna och for att administrera det beredda inj ekteringsbruket till agitatorn i mangder som baserats pa forbrukningen av injekteringsbruk, sasom den beraknats utifran den negativa vagningen av mangden av injekteringsbruk som ut- tagits fran agitatorn.

10. Anordning enligt krav 9, kiinnetecknad av ett antal av individuellt reglerade blandare (6A-6N), varvid detta antal är beroende av den kvantitet som erfordras av injekteringsutrustningen (8) och av separata flodesregleringsventiler (13, 14, 15, 17) associerade med varje vatten-, cement- och tillsatsforrad (2-5) genom vilka vatten, cement och tillsatser separat tillfors till varje blandare fran de respektive forraden.

11. Anordning enligt krav 9 eller 10, kannetecknad av en lastcell (12) for negativ vagning associerad med vade tillsatsfarrad (2, 3).

12. Anordning enligt nagot eller nagra av krav 9-11, kannetecknad av en gemensam reglerenhet (20) for separat reglering av tillforseln av ingredienser till, blandningsarbete for och uttag av injekteringsbruk (G) fran alla blandare (6A-6N) i enlighet med valda sammansattningar och baserat pa ingangsvarden fran lastsensorer, ventiler till forraden och berdknad forbrukning av injekteringsbruk baserad pa uttag av injekteringsbruk fran agitatorn (7). 13, Anordning enligt nagot eller nagra av krav 9-12, kannetecknad av att den gemensamma reglerenheten (20) omfattar: - utvarderingsorgan (21) for indata fran givare, vilka mottar detekterade vdrden fran alla last- celler (10, 11, 12); - beralmingsorgan (22) for indata frail givare, i vilka insignalvarden frail lastceller sedan inmatas; - en process-timer (24) som likaledes är ansluten till berakningsorganet for indata fran givare for att tillhandahalla tidsdata for beaming av massflodet av injekteringsbmk frail agitatorn (7) baserat pa den the negativa vagningen; och - reglerorgan (23) fcir reglering av aktiveringen av tillforseln av ingredienser till blandarna (6A-6N) savd1 som aktiyeringen av blandare. 120B 117